U.S. patent application number 14/319720 was filed with the patent office on 2014-10-23 for light source device and display device.
The applicant listed for this patent is SHARP KABUSHIKI KAISHA. Invention is credited to Toshiyuki FUJITA, Keita ITO, Kenichiro ITO, Yuuki KAWAMURA, Kenta MORIBE, Kazuki NAKAMICHI, Tomoo SASAKI, Tatsuo SUGAHARA, Hiroshi TAKAHASHI, Hideto TAKEUCHI, Kenzo TOSHIYUKI, Mamoru YAHATA.
Application Number | 20140313733 14/319720 |
Document ID | / |
Family ID | 42709035 |
Filed Date | 2014-10-23 |
United States Patent
Application |
20140313733 |
Kind Code |
A1 |
TAKEUCHI; Hideto ; et
al. |
October 23, 2014 |
LIGHT SOURCE DEVICE AND DISPLAY DEVICE
Abstract
There are provided a light source device and a display device
which do not generate a wrinkle on an optical sheet even if the
optical sheet is held on an LED substrate. A reflection sheet is
disposed between each of head portions possessed by a rivet, a
positioning rivet and a support rivet and one surface of an LED
substrate where an LED is mounted, and a gap in a direction of a
sheet thickness is provided between the head portion of each of the
rivets and the reflection sheet. In the case in which a sudden
thermal change is caused, therefore, the reflection sheet expands
or contracts between the head portion of each of the rivets and the
reflection sheet so that the wrinkle can be prevented from being
generated over the reflection sheet.
Inventors: |
TAKEUCHI; Hideto; (Osaka,
JP) ; FUJITA; Toshiyuki; (Osaka, JP) ;
SUGAHARA; Tatsuo; (Osaka, JP) ; KAWAMURA; Yuuki;
(Osaka, JP) ; YAHATA; Mamoru; (Osaka, JP) ;
TAKAHASHI; Hiroshi; (Osaka, JP) ; ITO; Keita;
(Osaka, JP) ; TOSHIYUKI; Kenzo; (Osaka, JP)
; ITO; Kenichiro; (Osaka, JP) ; NAKAMICHI;
Kazuki; (Osaka, JP) ; SASAKI; Tomoo; (Osaka,
JP) ; MORIBE; Kenta; (Osaka, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHARP KABUSHIKI KAISHA |
Osaka |
|
JP |
|
|
Family ID: |
42709035 |
Appl. No.: |
14/319720 |
Filed: |
June 30, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13321781 |
Nov 21, 2011 |
8807771 |
|
|
PCT/JP2010/056808 |
Apr 16, 2010 |
|
|
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14319720 |
|
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Current U.S.
Class: |
362/296.01 ;
362/311.01; 362/382 |
Current CPC
Class: |
F21V 17/06 20130101;
F21V 5/04 20130101; G02F 1/1336 20130101; G02F 2201/46 20130101;
G02F 1/133608 20130101; F21V 7/00 20130101; G02F 1/133605 20130101;
F21V 21/00 20130101; G02F 1/133603 20130101; F21V 13/04
20130101 |
Class at
Publication: |
362/296.01 ;
362/382; 362/311.01 |
International
Class: |
F21V 5/04 20060101
F21V005/04; F21V 7/00 20060101 F21V007/00; F21V 21/00 20060101
F21V021/00 |
Foreign Application Data
Date |
Code |
Application Number |
May 22, 2009 |
JP |
2009-124143 |
Jun 19, 2009 |
JP |
2009-146611 |
Jun 19, 2009 |
JP |
2009-146613 |
Jun 19, 2009 |
JP |
2009-146615 |
Jun 30, 2009 |
JP |
2009-155774 |
Jul 2, 2009 |
JP |
2009-158162 |
Jul 2, 2009 |
JP |
2009-158168 |
Jul 3, 2009 |
JP |
2009-159136 |
Jul 3, 2009 |
JP |
2009-159137 |
Jul 3, 2009 |
JP |
2009-159195 |
Jul 6, 2009 |
JP |
2009-160123 |
Jul 6, 2009 |
JP |
2009-160125 |
Nov 30, 2009 |
JP |
2009-271877 |
Claims
1. A display device, comprising: a substrate on which a
light-emitting element for applying light on a display panel is
mounted at one surface; a support plate for supporting the other
surface of the substrate; a plurality of through holes provided on
the substrate and the support plate, of which positions correspond
to each other; and a fixture including a head portion and a leg
portion protruded from the head portion, inserting the leg portion
from the one surface side of the substrate into each of the through
holes, and fixing the substrate to the support plate with the head
portion disposed on the one surface side of the substrate; wherein
a dimension from the substrate to a top of the head portion is set
to be smaller than a dimension from the substrate to a top of the
light-emitting element.
2. A display device, comprising: a substrate on which a
light-emitting element for applying light on a display panel is
mounted at one surface; a lens for covering the light-emitting
element at the one surface of the substrate; a support plate for
supporting the other surface of the substrate, a plurality of
through holes provided on the substrate and the support plate, of
which positions correspond to each other; and a fixture including a
head portion and a leg portion protruded from the head portion,
inserting the leg portion from the one surface side of the
substrate into each of the through holes, and fixing the substrate
to the support plate with the head portion disposed on the one
surface side of the substrate, wherein a dimension from the
substrate to a top of the head portion is set to be smaller than a
dimension from the substrate to a top of the lens.
3. The display device according to claim 2, wherein the dimension
from the substrate to the top of the head portion is set to be
smaller than a dimension from the substrate to a top of the
light-emitting element.
4. The display device according to claim 1, further comprising: a
reflection sheet disposed between the substrate and the head
portion for reflecting light applied from the light-emitting
element; and an inserting hole provided on the reflection sheet in
a corresponding position to each of the inserting holes, wherein
the leg portion is inserted into the inserting hole and the
reflection sheet is held in the head portion.
5. The display device according to claim 1, wherein the fixture is
a rivet.
6. The display device according to claim 1, wherein the fixture is
a screw.
7. The display device according to claim 1, wherein the
light-emitting element is a light-emitting diode.
Description
[0001] This application is a divisional of U.S. application Ser.
No. 13/321,781, filed Nov. 21, 2011, which is the national phase
under 35 U.S.C. .sctn.371 of PCT International Application No.
PCT/JP2010/056808 filed Apr. 16, 2010, which claims the benefit
under 35 U.S.C. .sctn.119(a) to Japanese Patent Application Nos.
2009-124143 filed May 22, 2009; 2009-146611 filed Jun. 19, 2009;
2009-146613 filed Jun. 19, 2009; 2009-146615 filed Jun. 19, 2009;
2009-155774 filed Jun. 30, 2009; 2009-158162 filed Jul. 2, 2009;
2009-158168 filed Jul. 2, 2009; 2009-159136 filed Jul. 3, 2009;
2009-159137 filed Jul. 3, 2009; 2009-159195 filed Jul. 3, 2009;
2009-160123 filed Jul. 6, 2009; 2009-160125 filed Jul. 6, 2009; and
2009-271877 filed Nov. 30, 2009, all of which were filed in Japan.
The entire contents of all of the above applications are hereby
incorporated by reference.
BACKGROUND
[0002] 1. Technical Field
[0003] The present invention relates to a light source device
provided with a light-emitting element, and a display device which
includes the light source device and displays a video image.
[0004] 2. Description of Related Art
[0005] A liquid crystal display device referred to as a thin type
such as a liquid crystal television includes a display unit which
has, on a right side, a display surface for displaying an image and
takes a shape of an almost rectangular parallelepiped, and a light
source device disposed on a back side of the display unit for
applying light on the display unit, and a diffusion plate and an
optical sheet such as a prism sheet are provided between the light
source device and the display unit.
[0006] The display unit has a liquid crystal display panel taking a
shape of an almost rectangular parallelepiped. The liquid crystal
display panel itself does not emit light. For this reason, an
illuminating light source for displaying a video image on the
display surface is required, and a backlight device is used as the
illuminating light source.
[0007] As the backlight device, there are generally employed an
edge light system in which a light guide is provided on a back side
of a display unit and an illuminating light source is disposed on
an edge side of the light guide, and a falling system in which a
diffusion plate is provided on the back side of the display unit
and an illuminating light source is disposed on a back side of the
diffusion plate.
[0008] Referring to the edge light system of the backlight device,
a cold cathode fluorescent lamp (CCFL) is provided on the edge side
of the light guide and light incident from the edge of the light
guide is emitted from one surface of the light guide while guiding
light in the light guide. Therefore, a luminance characteristic can
be enhanced in a display device including a display surface having
a comparatively small area. Referring to a display device including
a display surface having a comparatively large area, however, it is
hard to uniformly enhance the luminance characteristic. For this
reason, in a display device such as a television which is
increasingly large-sized, the backlight device of the falling
system is used.
[0009] For the backlight device of the falling system, there are
generally employed, as illuminating light sources, a CCFL type in
which a plurality of cold cathode fluorescent lamps (CCFLs) having
electrodes on both ends and taking a shape of a straight pipe or an
almost U shape are juxtaposed on a back side of the diffusion plate
(for example, see Japanese Patent Application Laid-Open No.
2008-116832) and an LED type in which a plurality of light-emitting
diodes (LEDs) are juxtaposed on a back side of the diffusion plate
(for example, see Japanese Patent Application Laid-Open No.
2006-114445, Japanese Patent Application Laid-Open No. 2009-87879,
Japanese Patent Application Laid-Open No. 2007-311561 and Japanese
Patent Application Laid-Open No. 2009-4116).
[0010] The backlight device of the CCFL type includes a plurality
of cold cathode fluorescent lamps juxtaposed vertically apart from
each other in a direction along a surface of a diffusion plate, a
support case for accommodating and supporting the cold cathode
fluorescent lamps, an inverter circuit board for emitting light
from the cold cathode fluorescent lamps, and a cover for covering
the inverter circuit board.
[0011] However, the backlight device of the CCFL type requires high
voltage components such as, for example, the inverter circuit board
for discharging the cold cathode fluorescent lamp, the electrodes
on the both ends of the cold cathode fluorescent lamp and the like,
and it is necessary to maintain a comparatively long insulating
distance around the high voltage components. Therefore, the high
voltage components hinder a longitudinal thickness from being
reduced. For this reason, there is a tendency that a backlight
device of an LED type which has no high voltage component, does not
need to maintain a comparatively long insulating distance and is
more advantageous to reduce a longitudinal thickness than the
backlight device of the CCFL type is employed for a recent display
device.
[0012] Moreover, the cold cathode fluorescent lamp is formed in a
length provided over both ends in a transverse direction of the
diffusion plate. For this reason, it is impossible to control a
lighting operation of the cold cathode fluorescent lamp in a fine
area. Furthermore, a high-speed flashing control for suppressing an
animation blur or the like is more disadvantageous as compared with
the LED type. In addition, power consumption is increased because
the cold cathode fluorescent lamps are turned ON at a high voltage.
Consequently, a heat value is also increased when the cold cathode
fluorescent lamps are ON. Therefore, it is advantageous to employ
the backlight device of the LED type which can easily carry out a
control in a fine area and a high-speed flashing control, and
furthermore, can lessen a power consumption and a heat value more
greatly than the backlight device of the CCFL type.
[0013] The backlight device of the LED type includes a plurality of
light-emitting diode substrates having one surface on which a
plurality of light-emitting diodes are mounted, a support case for
accommodating and supporting the light-emitting diode substrates,
and a power board for emitting light from the light-emitting
diodes.
[0014] The applicant of the present invention developed a backlight
device of an LED type including a plurality of light-emitting diode
substrates, each of which has a plurality of light-emitting diodes
mounted on one surface and takes a shape of a strip connected in a
line, a support case for accommodating and supporting the
light-emitting diode substrates in a plurality of lines apart from
each other in a vertical direction, a shaft member such as a rivet
for fixing both ends of the light-emitting diode substrate, a
connector for connecting the light-emitting diode substrates which
are adjacent to each other, a plurality of lenses attached to one
surface of the light-emitting diode substrate opposite to the
light-emitting diode for diffusing light emitted from the
light-emitting diode, a reflection sheet mounted on one of the
surfaces of the light-emitting diode substrate for reflecting the
light diffused by the lens, and a support pin for suppressing a
flexure of the diffusion plate.
[0015] The backlight device of the LED type is assembled in
accordance with the following steps (1) to (5).
[0016] (1) The support case is put flatly on a working table with
an open side turned upward, and the light-emitting diode substrates
which are adjacent to each other in a transverse direction are
juxtaposed in a plurality of lines in the support case.
[0017] (2) The light-emitting diode substrates which are adjacent
to each other are connected to each other through the connector,
and a power connecting connector is connected to the end of the
light-emitting diode substrate on an end side.
[0018] (3) Both ends of the light-emitting diode substrates which
are juxtaposed are fixed to the support case by means of the shaft
member such as a rivet.
[0019] (4) The reflection sheet is mounted on one of the surfaces
of the light-emitting diode substrate.
[0020] (5) The support pins are attached to the support case from
the reflection sheet side.
[0021] The support case is formed by a metal plate and has a flat
plate-shaped plate portion taking a square shape, a frame portion
linked to a peripheral edge of the plate portion and having one of
sides opened, and four collar pieces linked to an outer edge of the
frame portion. The plate portion is provided with a first mounting
hole in an opposite position to the both ends of the light-emitting
diode substrates which are juxtaposed, and a second mounting hole
in a position in which the support pin is to be disposed.
[0022] The light-emitting diode substrate takes a shape of a strip
in which a circuit portion is provided on one surface, the
light-emitting diode and a lens are mounted on the surface and a
connecting portion is provided on one surface of both ends, and a
through hole corresponding to the first mounting hole is provided
on the both ends.
[0023] The light-emitting diode is formed in such a manner that an
emitted light concentrates within a predetermined angle based on an
optical axis from a front of the light-emitting diode.
[0024] The lens is opposed to a top of the light-emitting diode
apart from each other, and takes a shape of a thick disk having a
hemispherical recess portion for diffusing light applied from the
light-emitting diode in all directions.
[0025] The reflection sheet takes a square shape corresponding to
the plate portion of the support case and has a structure in which
a first hole taking a larger shape than the lens is provided in an
opposed position to the lens and a second hole taking a larger
shape than the connector is provided in an opposed position to the
connector, the lens is provided in the first hole and the connector
is provided in the second hole when the reflection sheet is mounted
over the surface of the light-emitting diode substrate, and a
thermal expansion of the reflection sheet through the
light-emitting diode can be absorbed.
[0026] Japanese Patent Application Laid-Open No. 2006-114445
describes that a plurality of light-emitting diode substrates
having a plurality of light-emitting diodes mounted on one surface
are provided adjacently to each other in a bottom part of a
box-shaped support member, a reflection sheet for reflecting light
emitted from the light-emitting diode is stuck to a surface of the
support body, and a screw is inserted into a through hole provided
on each of the light-emitting diode substrates, thereby fixing the
light-emitting diode substrate to the support body.
SUMMARY
[0027] However, the backlight device of the LED type described in
Japanese Patent Application Laid-Open No. 2006-114445 has a problem
in that when the reflection sheet screwed into one of the surfaces
of the light-emitting diode substrate expands or contracts due to a
sudden thermal change, wrinkles are generated over the reflection
sheet due to the expansion or contraction and an optical
characteristic of a liquid crystal display device is thus
deteriorated.
[0028] Moreover, the backlight device of the LED type has the
following problem. In the case in which the circuit board is fixed
to the support body with a fixture such as a screw or a rivet, a
reflectance of a head portion of the fixture is usually lower than
that of the reflection sheet. Therefore, if a plurality of fixtures
are arranged rectilinearly, for example, a luminance of reflected
light in the vicinity of the fixtures is reduced so that luminance
unevenness of rectilinear illumination light is generated.
[0029] In the backlight device of the LED type, moreover, light
diffused by the lens is applied obliquely to one of the surfaces of
the light-emitting diode substrate. In some cases, therefore, the
light is blocked by the head portion of the screw fixing the
light-emitting diode substrate so that a shadow is thrown onto a
display panel. In these cases, so-called luminance unevenness is
generated so that a grade of the display device is
deteriorated.
[0030] In consideration of the circumstances, it is an object of
the present invention to provide a display device which does not
make a wrinkle on an optical sheet even if the optical sheet is
held on a substrate on which a light-emitting element such as a
light-emitting diode is mounted.
[0031] Moreover, it is an object of the present invention to
provide a light source device capable of preventing luminance
unevenness of illumination light from being caused by a fixture,
and a display device including the light source device.
[0032] Furthermore, it is an object of the present invention to
provide a display device capable of preventing luminance unevenness
from being caused by a fixture even if the fixture is provided on
one surface of a substrate having a light-emitting element disposed
on one surface when the substrate is fixed to a support plate.
[0033] A display device according to the present invention having a
substrate on which a light-emitting element for applying light on a
display panel is mounted at one surface, a support plate for
supporting the other surface of the substrate, and a reflection
sheet disposed on the one surface of the substrate for reflecting
the light applied from the light-emitting element, includes a
substrate hole provided on the substrate, a through hole provided
in a corresponding position to the substrate hole in the support
plate, an inserting hole provided in a corresponding position to
the substrate hole in the reflection sheet, and a rivet having a
head portion and a leg portion extended from the head portion and
inserting the leg portion from the one surface side of the
substrate into the substrate hole, the through hole and the
inserting hole, and a gap is provided between the head portion and
the reflection sheet.
[0034] In the present invention, the reflection sheet is disposed
between the head portion of the rivet and one of the surfaces of
the substrate, the gap is provided between the head portion of the
rivet and the reflection sheet, and the reflection sheet is caused
to expand or contract between the head portion of the rivet and the
reflection sheet when a sudden thermal change is caused.
[0035] It is preferable that the display device according to the
present invention should have a structure in which the inserting
hole has a larger diameter than the substrate hole, there is
provided a hook portion which is ring-shaped and is hooked into an
edge portion of the substrate hole at an inside of the inserting
hole, and the head portion is caused to abut on the hook portion
when the leg portion is inserted into the hook portion.
[0036] In the present invention, the leg portion of the rivet is
inserted into the hook portion in a state where the hook portion is
hooked into the edge portion of the substrate hole. At this time,
the head portion of the rivet abuts on the hook portion and the
reflection sheet is held in a state where a slight gap is provided
between the head portion and the reflection sheet.
[0037] It is preferable that the display device according to the
present invention should have such a structure as to include a
positioning hole provided on the substrate adjacently to the
substrate hole at the inside of the inserting hole for positioning
the reflection sheet, and a positioning portion disposed adjacently
to the leg portion, extended from the head portion to the substrate
side and inserted into the positioning hole.
[0038] In the present invention, the positioning portion is
provided in the head portion of the rivet, and the positioning
portion is inserted into the positioning hole so that when the
reflection sheet is moved the reflection sheet abuts on the
positioning portion to prevent the reflection sheet from being
moved.
[0039] It is preferable that the display device according to the
present invention should have such a structure as to include a
diffusion plate opposed to the reflection sheet for diffusing
light, and a support portion extended from the head portion toward
the diffusion plate side for supporting the diffusion plate.
[0040] In the present invention, the support portion is provided in
the head portion of the rivet. Consequently, the reflection sheet
is held, and furthermore, the diffusion plate is supported to
prevent the diffusion plate from being curved and to reduce the
number of components.
[0041] A light source device according to the present invention
includes a circuit board having a light-emitting element mounted on
one surface, a support body positioned on the other surface side of
the circuit board for supporting the circuit board, a plurality of
fixtures disposed apart from each other on the one surface side of
the circuit board to fix the circuit board to the support body, and
a reflection member having an opening through which the fixtures
are to be inserted and disposed on the one surface side of the
circuit board, and the fixtures are positioned zigzag.
[0042] According to the present invention, by means of the fixtures
inserted into the opening of the reflection member disposed on the
one surface side of the circuit board having a light-emitting
element mounted on the one surface and provided zigzag apart from
each other at the one surface side of the circuit board, the
circuit board is fixed to the support body positioned on the other
surface side. In this case, the fixtures are positioned zigzag.
Therefore, an influence of a reduction in a luminance due to the
fixture having a low optical reflectance is distributed so that
luminance unevenness of illumination light is suppressed.
[0043] It is preferable that the light source device according to
the present invention should have a structure in which the circuit
board has an inserting hole for inserting the fixture, and the
fixtures are inserted into the inserting hole of the circuit board
and are held on the support body.
[0044] According to the present invention, the fixtures disposed on
the one surface side of the circuit board are inserted into the
opening of the reflection member and the inserting hole of the
circuit board and are held on the support body positioned on the
other surface side of the circuit board. Consequently, the circuit
board is fixed to the support body.
[0045] It is preferable that the light source device according to
the present invention should have a structure in which the
light-emitting elements are juxtaposed in a longitudinal direction
of the circuit board taking a rectangular shape, the circuit board
has the inserting hole in a plurality of places in the longitudinal
direction, the circuit boards are juxtaposed in a transverse
direction, and each of the circuit boards which are adjacent to
each other in a juxtaposing direction thereof has the inserting
holes in respective positions of the places which are disposed
zigzag.
[0046] According to the present invention, the rectangular circuit
boards on which the light-emitting elements are juxtaposed in the
longitudinal direction thereof are juxtaposed in the transverse
direction, and the fixtures disposed on the one surface side of the
circuit boards are inserted into the inserting holes in the places
in the longitudinal direction of the circuit boards and are held on
the support body positioned on the other surface side of the
circuit boards. In this case, the fixture to be inserted into the
inserting hole in each of the positions in the places in the
longitudinal direction of the circuit boards which are adjacent to
each other is positioned zigzag in a direction in which the
rectangular circuit boards are juxtaposed. Therefore, a reduction
in a luminance caused by the fixture having a low light reflectance
is distributed so that luminance unevenness of illumination light
is suppressed.
[0047] It is preferable that the light source device according to
the present invention should have a structure in which the
light-emitting elements are juxtaposed in a longitudinal direction
of the circuit board taking a rectangular shape, the circuit board
has the inserting hole in a plurality of places in the longitudinal
direction, the circuit boards are juxtaposed in a line in the
longitudinal direction, the circuit boards juxtaposed in the line
are arranged in a plurality of lines in a transverse direction, and
each of the circuit boards which are adjacent to each other in an
orthogonal direction to the line of the circuit boards juxtaposed
in the line has the inserting holes disposed zigzag in each of
positions in the places.
[0048] According to the present invention, the rectangular circuit
boards on which the light-emitting elements are juxtaposed in the
longitudinal direction thereof are arranged in the line in the
longitudinal direction, and furthermore, the circuit boards which
are juxtaposed in the line are arranged in the plural lines in the
transverse direction, and the fixtures disposed on the one surface
side of the circuit boards are inserted into the inserting holes in
the places in the longitudinal direction of the circuit board and
are thus held on the support member positioned on the other surface
side of the circuit board. In this case, the fixtures to be
inserted into the inserting holes in the respective positions of
the plural places in the longitudinal direction of the circuit
boards which are adjacent to each other are positioned zigzag in
the orthogonal direction to the line of the rectangular circuit
boards which are juxtaposed in the line. Therefore, a reduction in
a luminance caused by the fixture having a low light reflectance is
distributed so that luminance unevenness of illumination light is
suppressed.
[0049] It is preferable that the light source device according to
the present invention should have a structure in which the circuit
boards which are adjacent to each other in the orthogonal direction
to the line of the circuit boards juxtaposed in the line have
almost equal dimensions in the longitudinal direction and have the
inserting holes on both ends in the longitudinal direction, and the
inserting holes on the both ends in the longitudinal direction are
positioned zigzag.
[0050] According to the present invention, the rectangular circuit
boards on which the light-emitting elements are juxtaposed in the
longitudinal direction thereof are arranged in the line in the
longitudinal direction, and furthermore, the circuit boards
juxtaposed in the line are arranged in the plural lines in the
transverse direction in a state in which the dimension in the
longitudinal direction of the circuit boards arranged in the
orthogonal direction to the line are almost equal to each other,
and the fixtures inserted into the inserting holes at both ends in
the longitudinal direction of the circuit board are held on the
support body positioned on the other surface side of the circuit
board. In this case, the fixtures to be inserted into the inserting
holes at both ends of the circuit boards which have almost equal
dimensions in the longitudinal direction and are adjacent to each
other are positioned zigzag in the orthogonal direction to the line
of the circuit boards juxtaposed in the line. Therefore, a
reduction in a luminance caused by the fixture having a low light
reflectance is distributed so that luminance unevenness of
illumination light is suppressed.
[0051] It is preferable that the light source device according to
the present invention should have a structure in which a through
hole corresponding to the inserting hole is formed on the support
member, and the fixture is a rivet including a cylinder member
which has an outside diameter that can be inserted into the
inserting hole and the through hole, has one of ends provided with
a flange portion that cannot be inserted into the inserting hole
and the through hole, and has the other end of which inside
diameter is smaller than an inside diameter of one of the ends, and
a shaft body which can be inserted into one of ends of the cylinder
member and includes a shaft portion having a larger diameter than
the inside diameter of the other end and a head portion that cannot
be inserted into the inserting hole and the through hole.
[0052] According to the present invention, the other end of the
cylinder member of the rivet is inserted into each of the inserting
holes of the circuit board, and furthermore, the cylinder member is
inserted into each of the through holes formed correspondingly to
each of the inserting holes on the support body positioned at the
other surface side of the circuit board, and the flange portion on
one of the ends of the cylinder member is received by the circuit
board. When the shaft portion of the shaft member is inserted into
one of the ends of the cylinder member and the head portion of the
shaft member is received by the flange portion of the cylinder
member, subsequently, the other end of the cylinder member is
extended by the shaft portion so that an outside diameter is
increased because the shaft portion has a larger diameter than the
inside diameter of the other end of the cylinder member.
Consequently, the other end cannot be inserted into the through
hole of the support body, and furthermore, a pressing force acts on
the shaft portion of the shaft member so that the rivet is held on
the support body. The head portion of the shaft member is pulled
out or the shaft portion is pushed toward the head portion to
remove the shaft member from the cylinder member, and the cylinder
member is thus removed from the through hole of the support body
and the inserting hole of the circuit board. Thus, each of the
circuit boards is prevented from being supported on the support
body.
[0053] A display device according to the present invention is
characterized by a display unit having a display surface on one of
sides and the light source device disposed on the other side of the
display unit.
[0054] According to the present invention, light emitted from the
light-emitting element mounted on the light source device disposed
on the other side of the display unit having a display surface on
one side is incident on the display unit to illuminate the display
unit.
[0055] A display device according to the present invention includes
a substrate on which a light-emitting element for applying light on
a display panel is mounted at one surface, a support plate for
supporting the other surface of the substrate, a plurality of
through holes provided on the substrate and the support plate, of
which positions correspond to each other, and a fixture including a
head portion and a leg portion protruded from the head portion,
inserting the leg portion from the one surface side of the
substrate into each of the through holes, and fixing the substrate
to the support plate with the head portion disposed on the one
surface side of the substrate, and a dimension from the substrate
to a top of the head portion is set to be smaller than a dimension
from the substrate to a top of the light-emitting element.
[0056] In the present invention, the dimension from the substrate
to the top of the head portion is set to be smaller than the
dimension from the substrate to the top of the light-emitting
element depending on an application range of light to be applied
from the light-emitting element. Thus, the light applied from the
light-emitting element is reliably prevented from being blocked by
the head portion of the fixture.
[0057] A display device according to the present invention is
characterized by a substrate on which a light-emitting element for
applying light on a display panel is mounted at one surface, a lens
for covering the light-emitting element at the one surface of the
substrate, a support plate for supporting the other surface of the
substrate, a plurality of through holes provided on the substrate
and the support plate, of which positions correspond to each other,
and a fixture including a head portion and a leg portion protruded
from the head portion, inserting the leg portion from the one
surface side of the substrate into each of the through holes, and
fixing the substrate to the support plate with the head portion
disposed on the one surface side of the substrate, and a dimension
from the substrate to a top of the head portion is set to be
smaller than a dimension from the substrate to a top of the
lens.
[0058] In the present invention, the dimension from the substrate
to the top of the head portion is set to be smaller than the
dimension from the substrate to the top of the lens depending on a
light diffusion range in which light is diffused through the lens.
Thus, the diffused light is prevented from being blocked by the
head portion of the fixture.
[0059] It is preferable that the display device according to the
present invention should have a structure in which a dimension from
the substrate to a top of the head portion is set to be smaller
than a dimension from the substrate to a top of the light-emitting
element.
[0060] In the present invention, in consideration of the case in
which the light applied from the light-emitting element is diffused
at a wide angle when it is transmitted through the lens, the
dimension from the substrate to the top of the head portion is set
to be smaller than the dimension from the substrate to the top of
the light-emitting element. Thus, the light diffused at the wide
angle is reliably prevented from being blocked by the head portion
of the fixture.
[0061] It is preferable that the display device according to the
present invention should have such a structure as to include a
reflection sheet disposed between the substrate and the head
portion for reflecting light applied from the light-emitting
element, and an inserting hole provided on the reflection sheet in
a corresponding position to each of the through holes, and the leg
portion is inserted into the inserting hole and the reflection
sheet is held in the head portion.
[0062] In the present invention, the substrate is fixed onto the
support plate through the fixture and the reflection sheet is held
by the head portion. Thus, the reflection sheet is prevented from
being peeled from the support plate and the number of components to
be used in the display device is reduced.
[0063] It is preferable that the display device according to the
present invention should have a structure in which the fixture is a
rivet.
[0064] In the present invention, the rivet is used as the fixture
to fix the substrate to the support plate rapidly and reliably.
[0065] It is preferable that the display device according to the
present invention should have a structure in which the fixture is a
screw.
[0066] In the present invention, the screw is used as the fixture
to fix the substrate to the support plate firmly.
[0067] It is preferable that the display device according to the
present invention should have a structure in which the
light-emitting element is a light-emitting diode.
[0068] In the present invention, by using the light-emitting diode
as the light-emitting element, it is possible to reduce a heat
value and to easily carry out a flashing control.
[0069] According to the display device in accordance with the
present invention, the reflection sheet is disposed between the
head portion of the rivet and one of the surfaces of the substrate,
and the gap is provided between the head portion of the rivet and
the reflection sheet. In the case in which a sudden thermal change
is caused, therefore, the reflection sheet expands or contracts
between the head portion of the rivet and the reflection sheet.
Consequently, a wrinkle can be prevented from being generated over
the reflection sheet.
[0070] According to the light source device in accordance with the
present invention, the fixtures are positioned zigzag, and an
influence of a reduction in a luminance due to the fixture having a
low light reflectance is distributed. Therefore, it is possible to
prevent luminance unevenness of illumination light from being
caused by the fixture.
[0071] According to the light source device in accordance with the
present invention, the fixtures inserted into the inserting holes
of the circuit board and held on the support body positioned on the
other surface side of the circuit board are positioned zigzag in
order to fix the circuit board to the support body. Therefore,
luminance unevenness of illumination light can be prevented from
being caused by the fixture, and furthermore, the position in which
the circuit board is supported by the support body is distributed
so that a more stable support can be carried out.
[0072] According to the light source device in accordance with the
present invention, by setting the number of the rectangular circuit
boards in the case in which the circuit boards are arranged in the
transverse direction thereof, a wide illumination range can be
implemented. In addition, the fixture to be inserted into the
inserting hole in each of the positions in the places in the
longitudinal direction of the adjacent circuit boards to each other
is positioned zigzag in a direction in which the rectangular
circuit boards are juxtaposed. Therefore, an influence of a
reduction in a luminance due to the fixture having a low optical
reflectance is distributed so that luminance unevenness of
illumination light can be suppressed.
[0073] According to the light source device in accordance with the
present invention, by setting the number of the rectangular circuit
boards juxtaposed in a line in the longitudinal direction and the
number of lines in which the circuit boards in the line are
juxtaposed in the transverse direction thereof, a wide illumination
range can be implemented. In addition, the fixture to be inserted
into the inserting hole in each of the positions of the places in
the longitudinal direction of the adjacent circuit boards to each
other is positioned zigzag in the orthogonal direction to the line
of the rectangular circuit boards which are juxtaposed in the line.
Therefore, an influence of a reduction in a luminance due to the
fixture having a low optical reflectance is distributed so that
luminance unevenness of illumination light can be suppressed.
[0074] According to the light source device in accordance with the
present invention, by setting the number of the rectangular circuit
boards juxtaposed in a line in the longitudinal direction and the
number of lines in which the circuit boards in the line are
juxtaposed in the transverse direction thereof, a wide illumination
range can be implemented. In addition, the fixture to be inserted
into the inserting hole on each of the both ends of the adjacent
circuit boards to each other with the dimensions in the
longitudinal direction almost equal to each other is positioned
zigzag in the orthogonal direction to the line of the circuit
boards juxtaposed in the line. Therefore, an influence of a
reduction in a luminance due to the fixture having a low optical
reflectance is distributed so that luminance unevenness of
illumination light can be suppressed.
[0075] According to the light source device in accordance with the
present invention, the rivet formed by the cylinder member and the
shaft member is used to support each of the circuit boards on the
support body by a simple operation, and the circuit board can be
released from the support of the support body.
[0076] According to the display device in accordance with the
present invention, there can be provided a light source device of a
falling type in which the light-emitting element is disposed on the
other side of the display unit and luminance unevenness of
illumination light is suppressed.
[0077] According to the display device in accordance with the
present invention, the dimension from the substrate to the top of
the head portion is set to be smaller than the dimension from the
substrate to the top of the light-emitting element depending on an
application range of light to be applied from the light-emitting
element, and the light applied from the light-emitting element is
thus prevented reliably from being blocked by the head portion of
the fixture. Therefore, it is possible to prevent a display grade
from being deteriorated due to the occurrence of aluminous
unevenness over the display panel. Moreover, the dimension from the
substrate to the top of the head portion is set to be smaller than
the dimension from the substrate to the top of the lens depending
on a diffusion range of light to be diffused by the lens, and the
diffused light is thus prevented from being blocked by the head
portion of the fixture. Therefore, it is possible to prevent the
display grade from being deteriorated due to the occurrence of a
luminous unevenness over the display panel.
[0078] The above and further objects and features will more fully
be apparent from the following detailed description with
accompanying drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0079] FIG. 1 is a schematic exploded perspective view of a
configuration of a display device according to the present
invention.
[0080] FIG. 2 is an exploded perspective view showing a
configuration of the display device according to the present
invention in condition where its cabinet is omitted.
[0081] FIG. 3 is a partial vertical cross-sectional view of the
configuration of the display device according to the present
invention.
[0082] FIG. 4 is a schematic perspective view showing a
configuration of a light source device according to the present
invention.
[0083] FIG. 5 is a front view showing the configuration of the
light source device according to the present invention.
[0084] FIG. 6 is a partial vertical cross-sectional plan view
showing the configuration of the light source device according to
the present invention.
[0085] FIG. 7 is a schematic front view showing a configuration of
a substrate support body.
[0086] FIG. 8 is a schematic back view showing the configuration of
the light source device.
[0087] FIG. 9 is a perspective view showing a configuration of a
light-emitting diode substrate.
[0088] FIG. 10 is a schematic front view showing a layout of a
light-emitting diode substrate.
[0089] FIG. 11 is an enlarged front view showing a configuration of
a lens and a shaft body portion.
[0090] FIG. 12 is a graph showing a light emission amount as a
function of a light emission angle of light emitted from the
light-emitting diode.
[0091] FIG. 13A is an exploded cross-sectional view showing a
configuration of a shaft body.
[0092] FIG. 13B is an exploded perspective view showing the
configuration of the shaft body.
[0093] FIGS. 14A and 14B are exploded cross-sectional views showing
the configuration of the shaft body portion.
[0094] FIG. 15 is an enlarged cross-sectional view taken along line
XV-XV of FIG. 13A.
[0095] FIG. 16 is a front view showing a configuration of a
reflection sheet.
[0096] FIG. 17 is a development view showing a configuration of a
corner portion of the reflection sheet.
[0097] FIG. 18 is a cross-sectional view showing a configuration of
a support pin.
[0098] FIG. 19 is a cross-sectional view showing a configuration of
a lead wire holding jig.
[0099] FIG. 20 is a cross-sectional view showing the lead wire
holding jig in condition where its lid is opened.
[0100] FIG. 21 is a perspective view showing a configuration of a
lead hole portion in a substrate support body.
[0101] FIG. 22 is a partially enlarged view showing the lead wire
holding jig in condition where its lid is removed.
[0102] FIG. 23 is a development view showing another configuration
of the corner of the reflection sheet.
[0103] FIG. 24 is a front view showing another configuration of the
portion that faces the connector of the reflection sheet.
[0104] FIG. 25 is a front view showing another configuration of the
light source device.
[0105] FIG. 26 is a schematic front view showing another
configuration of the substrate support body.
[0106] FIG. 27 is a schematic front view showing another
configuration of the reflection sheet.
[0107] FIG. 28 is a cross-sectional view showing another
relationship between the reflection sheet and the shaft body.
[0108] FIG. 29 is a perspective view showing a configuration of a
light source device according to an embodiment 1.
[0109] FIG. 30 is a plan view showing the configuration of the
light source device according to the embodiment 1.
[0110] FIG. 31 is a plan view showing a configuration of the light
source device according to the embodiment 1 in which a reflection
sheet of the light source device is omitted.
[0111] FIG. 32 is a partially enlarged cross-sectional view showing
the configuration of the light source device according to the
embodiment 1.
[0112] FIG. 33 is a plan view showing a configuration of the
reflection sheet included in the light source device according to
the embodiment 1.
[0113] FIG. 34 is an enlarged front view showing a configuration of
main portions in condition where the reflection sheet is spread
out.
[0114] FIG. 35 is an enlarged front view showing a configuration of
the main components of the reflection sheet.
[0115] FIG. 36 is an enlarged lateral plan view showing a
configuration of a reflection sheet portion.
[0116] FIG. 37 is a cross-sectional view showing a configuration of
a display device including a light source device according to the
embodiment 1.
[0117] FIG. 38 is an exploded front view showing another
configuration of main components of a reflection sheet included in
a light source device according to the embodiment 1.
[0118] FIG. 39 is an exploded front view showing another
configuration of the main components of the reflection sheet
included in the light source device according to the embodiment
1.
[0119] FIG. 40 is an enlarged front view showing a further
configuration of the main components of the reflection sheet.
[0120] FIG. 41A is an exploded front view showing another
configuration of the main components of the reflection sheet.
[0121] FIG. 41B shows a further configuration of the main
components of the reflection sheet and is a front view of it in
condition where it is shaped like a case.
[0122] FIG. 42 is a plan view showing other configurations of the
reflection sheet.
[0123] FIG. 43 is a plan view showing other configurations of the
reflection sheet.
[0124] FIG. 44 is a partially enlarged schematic cross-sectional
view illustrating a structure of a light source device in
accordance with an embodiment 2.
[0125] FIG. 45 is a plan view that illustrates the light source
device of the embodiment 2 one portion of which is omitted.
[0126] FIG. 46 is a schematic perspective view that illustrates the
light source device of the embodiment 2 one portion of which is
disassembled.
[0127] FIG. 47 is a plan view that illustrates the structure of the
light source device of the embodiment 2 from which a reflection
sheet is omitted.
[0128] FIG. 48 is a perspective view that illustrates a structure
of a light-emitting diode substrate on which lenses are attached of
the light source device of the embodiment 2.
[0129] FIG. 49 is a perspective view that illustrates a structure
of a connector of the light source device of the embodiment 2.
[0130] FIG. 50 is an enlarged plan view that illustrates a portion
of the reflection sheet that is opposed to the connector of the
light source device of the embodiment 2.
[0131] FIG. 51 is an enlarged perspective view that shows a state
in which the portion of the reflection sheet facing the connector
is biased in a thickness direction in the light source device of
the embodiment 2.
[0132] FIG. 52 is a cross-sectional view that illustrates a
structure of a display device in which the light source device of
the embodiment 2 is installed.
[0133] FIG. 53 is an enlarged plan view that illustrates another
structure of a slit portion of the reflection sheet installed in
the light source device of the embodiment 2.
[0134] FIG. 54 is a plan view that illustrates still another
structure of a slit portion of the reflection sheet installed in
the light source device of the embodiment 2.
[0135] FIG. 55 is a plan view that illustrates still another
structure of a slit portion of the reflection sheet installed in
the light source device of the embodiment 2.
[0136] FIG. 56 is a plan view that illustrates still another
structure of a slit portion of the reflection sheet installed in
the light source device of the embodiment 2.
[0137] FIG. 57 is a plan view that illustrates still another
structure of a slit portion of the reflection sheet installed in
the light source device relating to the present invention of the
embodiment 2.
[0138] FIG. 58 is a perspective view that illustrates another
structure of the reflection sheet installed in the light source
device of the embodiment 2.
[0139] FIG. 59 is a perspective view that illustrates still another
structure of the reflection sheet installed in the light source
device of the embodiment 2.
[0140] FIG. 60 is a perspective view that illustrates still another
structure of the reflection sheet installed in the light source
device of the embodiment 2.
[0141] FIG. 61 is a longitudinal cross-sectional view that
schematically illustrates a display device in accordance with an
embodiment 3.
[0142] FIG. 62 is a front view that schematically illustrates
light-emitting diodes and a light-emitting diode substrate on which
the reflection sheet of the embodiment 3 is formed.
[0143] FIG. 63 is a cross-sectional view taken along line I-I of
FIG. 62, which schematically illustrates a rivet of the embodiment
3.
[0144] FIG. 64 is a cross-sectional view taken along line II-II of
FIG. 62, which schematically illustrates a positioning rivet of the
embodiment 3.
[0145] FIG. 65 is a cross-sectional view taken along line III-III
of FIG. 62, which schematically illustrates a supporting rivet of
the embodiment 3.
[0146] FIG. 66A is an enlarged cross-sectional view that
illustrates another structure of a portion for use in securing the
light-emitting diode substrate on a support plate of the embodiment
3.
[0147] FIG. 66B is an enlarged cross-sectional view that
illustrates still another structure of a portion for use in
securing the light-emitting diode substrate on a support plate of
the embodiment 3.
[0148] FIG. 67 is a cross-sectional view that illustrates a main
portion of a structure of a light source device of an embodiment
4.
[0149] FIG. 68 is a plan view that illustrates one portion of the
light source device of the embodiment 4.
[0150] FIG. 69 is a plan view that illustrates one portion
disassembled in the light source device of the embodiment 4.
[0151] FIG. 70 is a plan view that illustrates partial members of
the light source device of the embodiment 4.
[0152] FIG. 71 is an enlarged plan view that illustrates one
portion of the light source device of the embodiment 4.
[0153] FIG. 72 is an enlarged plan view that illustrates one
portion of the light source device of the embodiment 4.
[0154] FIG. 73 is a perspective view that illustrates a structure
of a light-emitting diode substrate with lenses attached thereto of
the embodiment 4.
[0155] FIG. 74 is a perspective view that illustrates a structure
of a light-emitting diode substrate with lenses attached thereto of
the embodiment 4.
[0156] FIG. 75 is a cross-sectional view that illustrates one
example of a fixture of the embodiment 4.
[0157] FIG. 76 is a cross-sectional view that illustrates a
structure of a display device in which the light source device of
the embodiment 4 is installed.
[0158] FIG. 77 is a plan view that illustrates one portion of a
light source device in accordance with another embodiment of the
embodiment 4.
[0159] FIG. 78 is a plan view that illustrates one portion
disassembled in the light source device in accordance with second
other embodiment of the embodiment 4.
[0160] FIG. 79 is a plan view that illustrates partial members of
the light source device in accordance with second other embodiment
of the embodiment 4.
[0161] FIG. 80 is a schematic longitudinal cross-sectional diagram
showing a display device of an embodiment 5.
[0162] FIG. 81 is a schematic front diagram showing light-emitting
diodes and substrates that are provided with a reflection sheet of
the embodiment 5.
[0163] FIG. 82 is a graph showing the amount of emitted light in
relation to the angle of the light emitted from a light-emitting
diode of the embodiment 5.
[0164] FIG. 83 is a cross-sectional diagram along line IV-IV in
FIG. 81 where rivets of the embodiment 5 are schematically
shown.
[0165] FIG. 84 is a schematic cross-sectional diagram showing
rivets in the modification of the embodiment 5.
[0166] FIG. 85 is a schematic cross-sectional diagram showing
screws in a display device of the embodiment 5.
[0167] FIG. 86 is a cross-sectional diagram showing an enlargement
of a portion of the structure in the display device of an
embodiment 6.
[0168] FIG. 87 is a cross-sectional diagram showing an enlargement
of a portion of the structure of the light source of the embodiment
6.
[0169] FIG. 88 is a front diagram showing the structure of the
light source of the embodiment 6 where the peripheral portion is
omitted.
[0170] FIG. 89 is a front diagram showing the structure of the
light source of the embodiment 6 where the peripheral portion and
the light reflection sheet are omitted.
[0171] FIG. 90 is a front diagram showing the structure of the
light reflection sheet of the embodiment 6 where the peripheral
portion is omitted.
[0172] FIG. 91A is a cross-sectional diagram showing the structure
of a first shaft portion of the embodiment 6 as viewed from the
side.
[0173] FIG. 91B is a cross-sectional diagram showing the structure
of the first shaft portion of the embodiment 6 as viewed from the
top.
[0174] FIG. 92A is a cross-sectional diagram showing the structure
of a second shaft portion of the embodiment 6 as viewed from the
side.
[0175] FIG. 92B is a cross-sectional diagram showing the structure
of the second shaft portion of the embodiment 6 as viewed from the
top.
[0176] FIG. 93 is a cross-sectional diagram showing the structure
of a third shaft portion of the embodiment 6 as viewed from the
top.
[0177] FIG. 94 is a cross-sectional diagram showing another
structure of a first shaft portion of the embodiment 6 as viewed
from the side.
[0178] FIG. 95 is a cross-sectional diagram showing another
structure of the second shaft portion of the embodiment 6 as viewed
from the side.
[0179] FIG. 96 is a plan diagram showing another structure of a
hole for preventing the position from shifting as viewed from the
top.
[0180] FIG. 97 is a cross-sectional diagram showing another
structure of the first shaft portion and the second shaft portion
as viewed from the side.
[0181] FIG. 98 is a schematic perspective diagram showing another
structure of the light source unit.
[0182] FIG. 99 is a front diagram showing another structure of the
portion for preventing the position from shifting of the light
reflection sheet.
[0183] FIG. 100 is a cross sectional view showing main parts of a
structure of a light source device of an embodiment 7.
[0184] FIG. 101 is a plan view of a part of the light source device
of the embodiment 7.
[0185] FIG. 102 is a plan view of the light source device of the
embodiment 7 with its part disassembled.
[0186] FIG. 103 is a plan view of a part of the light source device
of the embodiment 7.
[0187] FIG. 104 is a partially enlarged plan view of the light
source device of the embodiment 7.
[0188] FIG. 105 is an enlarged perspective view of a connector of
the embodiment 7.
[0189] FIG. 106 is a plan view schematically showing a structure of
the connector of the embodiment 7.
[0190] FIG. 107 is a plan view showing dimensional relationship of
insertion holes of the embodiment 7.
[0191] FIG. 108 is a perspective view showing a configuration of
light-emitting diode substrates of the embodiment 7, onto which
lenses are attached.
[0192] FIG. 109 is a cross sectional view showing an example of a
fixture of the embodiment 7.
[0193] FIG. 110 is a cross sectional view showing a configuration
of a display device including the light source device of the
embodiment 7.
[0194] FIG. 111A is a perspective view showing a configuration of a
light-emitting diode substrate in another embodiment of the
embodiment 7.
[0195] FIG. 111B is a perspective view showing a configuration of a
light-emitting diode substrate in yet another embodiment of the
embodiment 7.
[0196] FIG. 112 is a cross sectional view showing main parts of a
structure of a light source device of an embodiment 8.
[0197] FIG. 113 is a plan view of a part of the light source device
of the embodiment 8.
[0198] FIG. 114 is a plan view of the light source device of the
embodiment 8 with its part disassembled.
[0199] FIG. 115 is a plan view of a part of the light source device
of the embodiment 8.
[0200] FIG. 116 is a partially enlarged plan view of the light
source device of the embodiment 8.
[0201] FIG. 117 is a perspective view showing a configuration of
light-emitting diode substrates of the embodiment 8, onto which
lenses are attached.
[0202] FIG. 118 is a cross sectional view showing a structure of
rivets of the embodiment 8.
[0203] FIG. 119 is a plan view along a line V-V in FIG. 118.
[0204] FIG. 120 is a cross sectional view of a positional
relationship of the rivets and the lenses of the embodiment 8.
[0205] FIG. 121 is a cross sectional view showing a configuration
of a display device including the light source device of the
embodiment 8.
[0206] FIG. 122 is a plan view showing a rear face side of a head
portion of a rivet in another light source device of the embodiment
8.
[0207] FIG. 123 is a partially enlarged plan view of another light
source device of the embodiment 8.
[0208] FIG. 124 is a plan view showing a rear face side of a head
portion of a rivet in another, second light source device of the
embodiment 8.
[0209] FIG. 125 is a vertical cross sectional view showing a
partial configuration of a display device including a light source
device of the embodiment 9.
[0210] FIG. 126 is a horizontal cross sectional view showing a
configuration of a connecting portion of circuit boards that the
light source device of the embodiment 9 includes.
[0211] FIG. 127A is a front view showing the configuration of the
connecting portion of the circuit boards that the light source
device of the embodiment 9 includes.
[0212] FIG. 127B is a front view showing a relationship of the
circuit boards and attachment members that the light source device
of the embodiment 9 includes.
[0213] FIG. 128 is a perspective view schematically showing a state
in which the circuit boards included in the light source device of
the embodiment 9 are arranged in parallel.
[0214] FIG. 129 is a plan view of an illumination device in
accordance with an embodiment 10.
[0215] FIG. 130 is a plan view of the backlight chassis in
accordance with the embodiment 10.
[0216] FIG. 131 is a perspective view showing an outer appearance
of the LED substrate in accordance with the embodiment 10.
[0217] FIG. 132 is an enlarged cross sectional view showing an
attached portion of the LED substrate in accordance with the
embodiment 10.
[0218] FIG. 133 is an enlarged cross sectional view showing an
attached portion of the LED substrate in accordance with the
embodiment 10.
[0219] FIG. 134 is a cross sectional view of a liquid crystal
display device in accordance with the embodiment 10.
[0220] FIG. 135 is a cross sectional view showing another
embodiment of the liquid crystal display device in accordance with
the embodiment 10.
[0221] FIG. 136 is a cross sectional view showing a partial
structure of the display device provided with the backlight device
in accordance with an embodiment 11.
[0222] FIG. 137 is a partially enlarged cross sectional view
showing a structure of the backlight device in accordance with the
embodiment 11.
[0223] FIG. 138 is a cross sectional view showing a structure of a
rivet of the backlight device in accordance with the embodiment
11.
[0224] FIG. 139 is a partly omitted plan view of the backlight
device in accordance with the embodiment 11.
[0225] FIG. 140 is a partly exploded schematic perspective view of
the backlight device in accordance with the embodiment 11.
[0226] FIG. 141A is a partly enlarged plan view showing a structure
of a reflection sheet of the backlight device in accordance with
the embodiment 11.
[0227] FIG. 141B is a partly enlarged plan view showing a structure
of a reflection sheet of the backlight device in accordance with
the embodiment 11.
[0228] FIG. 142 is a vertical cross sectional view schematically
showing the display device in accordance with an embodiment 12.
[0229] FIG. 143 is a schematic back elevational view in which the
support plate is seen from a rear side in accordance with an
embodiment 12.
[0230] FIG. 144 is a perspective view which schematically shows a
through hole provided in an opening manner in the vicinity of an
edge of the support plate in accordance with an embodiment 12.
[0231] FIG. 145 is a plan view which schematically shows the
protection tube fitted to the through hole.
[0232] FIG. 146 is a schematic cross sectional view in a line
VII-VII described in FIG. 145.
[0233] FIG. 147 is a schematic cross sectional view in a line
VIII-VIII described in FIG. 145.
[0234] FIG. 148 is a schematic cross sectional view in a line IX-IX
described in FIG. 145.
[0235] FIG. 149 is a plan view schematically showing the lid.
[0236] FIG. 150 is a schematic side elevational view as seen from a
direction of F1 described in FIG. 149.
[0237] FIG. 151 is a schematic side elevational view as seen from a
direction of F2 described in FIG. 149.
[0238] FIG. 152 is a schematic cross sectional view in a line XI-XI
described in FIG. 149.
[0239] FIG. 153 is a schematic side elevational view as seen from a
direction of F3 described in FIG. 149.
[0240] FIG. 154 is an explanatory view explaining the attachment of
the lid to the protection tube.
[0241] FIG. 155 is an explanatory view explaining the attachment of
the lid to the protection tube.
[0242] FIG. 156 is an explanatory view explaining an attachment of
the lid to the protection tube of the display device in accordance
with an embodiment 12.
[0243] FIG. 157 is an explanatory view explaining an attachment of
the lid to the protection tube of the display device in accordance
with an embodiment 12.
[0244] FIG. 158 is a perspective view schematically showing the
vicinity of an engaging shaft in an enlarged manner.
DETAILED DESCRIPTION
[0245] The following will describe in detail embodiments of the
present invention with reference to the drawings.
[0246] FIG. 1 is a schematic exploded perspective view of a
configuration of a display device according to the present
invention, FIG. 2 is an exploded perspective view showing a
configuration of the display device in condition where its cabinet
is omitted, FIG. 3 is a partial vertical cross-sectional view of
the configuration of the display device, FIG. 4 is a schematic
perspective view showing a configuration of a light source device,
FIG. 5 is a front view showing the configuration of the light
source device, FIG. 6 is a partial vertical cross-sectional plan
view showing the configuration of the light source device, FIG. 7
is a schematic front view showing a configuration of a substrate
support body, FIG. 8 is a schematic back view showing the
configuration of the light source device, FIG. 9 is a perspective
view showing a configuration of a light-emitting diode substrate,
FIG. 10 is a schematic front view showing a layout of the
light-emitting diode substrate, FIG. 11 is an enlarged front view
showing a configuration of a lens and a shaft body portion, FIG. 12
is a graph showing a light emission amount as a function of a light
emission angle of light emitted from the light-emitting diode, FIG.
13A is an exploded cross-sectional view showing a configuration of
a shaft body, FIG. 13B is an exploded perspective view showing the
configuration of the shaft body, FIGS. 14A and 14B are exploded
cross-sectional views showing the configuration of the shaft body
portion, FIG. 15 is an enlarged cross-sectional view taken along
line XV-XV of FIG. 13A, FIG. 16 is a front view showing a
configuration of a reflection sheet, FIG. 17 is a development view
showing a configuration of a corner portion of the reflection
sheet, FIG. 18 is a cross-sectional view showing a configuration of
a support pin, FIG. 19 is a cross-sectional view showing a
configuration of a lead wire holding jig, FIG. 20 is a
cross-sectional view showing the lead wire holding jig in condition
where its lid is opened, FIG. 21 is a perspective view showing a
configuration of a lead hole portion in a substrate support body,
and FIG. 22 is a partially enlarged view showing the lead wire
holding jig in condition where its lid is removed.
[0247] The display device shown in FIGS. 1 to 3 includes a roughly
rectangular solid-shaped display unit A having a display surface
displaying a TV image on its front side, a roughly rectangular
solid-shaped light source device B disposed behind this display
unit A, an optical sheet C disposed between the light source device
B and the display unit A, and a cabinet D for shielding a rim of
the display unit A and a rear side of the light source device
B.
<Configuration of Display Unit A>
[0248] As shown in FIGS. 1 to 3, the display unit A has a roughly
rectangular solid-shaped liquid crystal display panel A1 having the
display surface and a front holding frame body A2 and a rear
holding frame body A3 for holding the rim of this display panel A1
in condition where it is sandwiched by them between the front and
the rear, in a configuration that the rim of the display panel A1
is held as sandwiched between the front and the rear by binding the
front holding frame body A2 and the rear holding frame body A3 by
using a plurality of male screws. A portion of the display unit A
that is not sandwiched by the front holding frame body A1 and a
rear holding frame body A2 has a plurality of holes formed in it
for attaching the rim of the display unit A to the light source
device B.
<Configuration of Light Source Device B>
[0249] As shown in FIGS. 1 to 6, the light source device B includes
a plurality of light-emitting diodes B1 serving as a light source
that are spaced in two directions perpendicular to each other and
arranged in a grid, a group of circuit boards that have a plurality
of light-emitting diode substrates B3 arranged in one direction and
thoroughly mounted on its one surface with these light-emitting
diodes B1 and lenses B each of which faces the top of each of the
light-emitting diodes B1 and that are arranged in a plurality of
lines, a plurality of connectors B4 connecting the neighboring
light-emitting diode substrates B3 on the circuit board group, a
reflection sheet B5 facing the one surface and one surface of the
connector B4 for reflecting light diffused by the lens B2, a
substrate support body B6 for supporting the circuit board group
arranged in a plurality of lines on its one surface, a plurality of
shaft bodies B7 for fixing both ends of each of the light-emitting
diode substrates B3 to the substrate support body B6, a plurality
of support pins B8 for suppressing flexure of the optical sheet C,
a lead wire holding jig B9 for bundling and holding midsections of
a plurality of lead wires B40 connected to the light-emitting diode
substrate B3, and a plurality of circuit boards B10 disposed on an
outer surface of the substrate support body B6.
<Configuration of Substrate Support Body B6>
[0250] The substrate support body B6 is made of a metal plate and,
as shown in FIGS. 2 to 4, shaped like a case and includes a roughly
rectangular plate-shaped plate portion B61 and four collar pieces
B63 that connect to a frame portion B62 connecting to the rim of
this plate portion B61 and having an open front and to outer edges
of this frame portion B62.
[0251] As shown in FIG. 7, the plate portion B61 includes a
plurality of first attachment holes B64 into which the shaft bodies
B7 for fixing both ends of the light-emitting diode substrate B3
are fitted, a plurality of second attachment holes B65 for
attachment of the shaft bodies B7 so that the support pin B8 or the
reflection sheet B5 may be inhibited from deviating in a direction
in which it separates from the light-emitting diode substrate B3, a
plurality of third attachment holes B66 for attachment of
accessories such as the circuit board B10 to the other surface of
the plate portion B61, a plurality of positioning holes B67 for
positioning the substrate support body B6 to a form block for
forming it, a plurality of positioning convex portions B68 for
positioning the light-emitting diode substrate B3, convex-shaped
first and second indexes B69a and B69b for preventing a mistake in
assembly of the light-emitting diode substrate B3, and a whirl-stop
hole B60 disposed around one of the first attachment holes B64.
[0252] The first attachment holes B64 are spaced and arranged in
one direction in a configuration that the plurality of attachment
holes B64 arranged in one direction make a hole string and a
plurality of the hole strings are arranged in parallel with each
other. The second attachment hole B65 is formed between the two
first attachment holes B64 formed in one of the light-emitting
diode substrates B3 and disposed at a plurality of positions
separate from each other and having the same size as the first
attachment hole B64.
[0253] The third attachment hole B66 is formed at a position that
faces the light-emitting diode substrate B3 between the two first
attachment holes B64 formed in one of the light-emitting diode
substrates B3 and arranged to be blocked up by the
light-transmitting diode substrate B3. The periphery of the third
attachment hole B66 is depressed toward the other surface side so
that the end of a shaft part fitted into the third attachment hole
B66 from this other surface side may not abut against the
light-emitting diode substrate B3. The positioning hole B67 is
arranged to be blocked up by the light-emitting diode substrate B3
as it is formed between the two first attachment holes B64 formed
in one of the light-emitting diode substrate B3 and disposed at
three positions separate from each other and facing the
light-emitting diode substrate B3. The positioning convex portion
B68 is formed so that it may project on the one surface at part of
the position facing the rim of each of the light-emitting diode
substrates B3. The whirl-stop hole B60 has a diameter smaller than
the first attachment hole B64 and is formed at a position slightly
separate from the first attachment hole B64 disposed at the
midsection of the plate portion B61.
[0254] On one surface of the plate portion B61 the circuit board
group is housed and supported in a plurality of lines, while on the
other surface of the plate portion B61 and on one
length-directional side, as shown in FIG. 8, a power supply circuit
board B10a is mounted which is connected via a second connector B41
to one light-emitting diode substrate B3 among the circuit board
group and on the other length-directional side a control circuit
board B10b is mounted which drives and controls the display unit
A.
[0255] On one length-directional side of the plate portion B61, as
shown in FIG. 8, a lead hole B61a is formed for leading a lead wire
B40 of each of the connectors B41 to the other side of the plate
portion B61, outside which lead hole B61a the lead wire holding jig
B9 is attached. At the inner edge of the lead hole B61a, a
plurality of recess portions B61b are formed and around the lead
hole B61a a recess lock portion B61c is provided as shown in FIG.
21.
[0256] On the lower side at the length-directional midsection on
the other surface of the plate portion B61, a signal processing
circuit board B10c is mounted which processes an image signal
displayed on the display surface of the display unit A. At a
plurality of circumference directional positions of the collar
piece B63, an attachment hole corresponding to the hole in the
display unit A is formed and arranged to bind the display unit A to
the substrate support body B6 through tightening of the male
screws.
<Configuration of Light-Emitting Diode Substrate B3>
[0257] As shown in FIG. 9, the light-emitting diode substrate B3 is
shaped like an oblong having a circuit portion on its one surface
as well as the light-emitting diode B1 and the lens B2 mounted on
it and a male-type or female-type connecting portion B31 on one
surface of its one end and a female-type or male-type connecting
portion B32 on one surface of the other end. On the light-emitting
diode substrate B3, through holes B33 and B34 corresponding to the
first attachment holes B64 are formed on the respective two ends,
positioning recesses B35 corresponding to the respective two
positioning convex portions B68 are formed between the two
positions of the through holes B33 and B34, a fit-in hole B36
corresponding to the second attachment hole B65 is formed between
the positioning recesses B35, and a first recess marker B37
corresponding to the first index B69a is formed at one
length-directional end so that the light-emitting diode substrates
B3 having the different connecting portion structures at their
respective two ends may not be disposed in a wrong direction, and,
further, a second recess marker B38 corresponding to the second
index B69b is formed in both width-directional sides of one
length-directional end so that the later-described two kinds of
light-emitting diode substrates B3 (first substrate and second
substrate) may not be disposed mistakenly. One of the positioning
recesses B35 is formed at a position facing the whirl-stop hole
B60. The circuit board group is configured by arranging the
plurality of light-emitting diode substrates B3 having the same or
different lengths in one direction as shown in FIG. 10. The group
of the circuit boards having the different lengths can be formed
by, for example, selecting any one of the light-emitting diode
substrate B3 from among three kinds of a short light-emitting diode
substrate mounted with the evenly spaced five light-emitting diodes
B1, a medium-length light-emitting diode substrate mounted with the
evenly spaced six light-emitting diodes B1, and a long
light-emitting diode substrate mounted with the evenly spaced seven
or eight light-emitting diodes B1 and combining it in one direction
as shown in FIGS. 5 and 10.
[0258] The light-emitting diodes B1 have large irregularities in
luminance, so that the circuit board groups has the high-luminance
light-emitting diode B1 and the low-luminance light-emitting diode
B1 arranged alternately in order to make the luminance uniform, in
a configuration that the light-emitting diode substrate B3 includes
a first substrate on which the light-emitting diodes B1 are
arranged in a descending order of luminance and a second substrate
on which the light-emitting diodes B1 are arranged in an ascending
order of luminance, those two first and second substrates being
colored differently so that they can be distinguished from each
other at first glance.
[0259] The through hole B33 formed at the one end of the
light-emitting diode substrate B3 is formed smaller in diameter
than the through hole B34 formed at the other end, a gap between
the small-sized through hole B33 and the shaft body B7 fit into it
is decreased, and a gap between the larger-sized through hole B34
and the shaft body B7 fitted into it is increased to enable moving
the side of larger-sized through hole B34 in the width-direction
around the shaft body B7 fitted into the smaller-sized through hole
B33 so that no overload may be applied to the connector B4 that
interconnects the ends of the respective light-emitting diode
substrates B3 arranged in the line direction.
[0260] The distance between the positioning recesses B35, B35
formed at the respective two positions on one light-emitting diode
substrate B3 changes with the changing length of the light-emitting
diode substrate B3 and is small for the short light-emitting diode
substrate B3, medium for the medium-length light-emitting diode
substrate B3, and large for the long light-emitting diode substrate
B3 so that the light-emitting diode substrates B3 having the
different lengths may not be arranged mistakenly.
[0261] The first marker B37 is formed by caving in a portion of the
length-directional end to place the first index B69a into this
marker B37 so that if the light-emitting diode substrate B3 having
the different connecting portion structure of the both ends is
allocated in a wrong direction, the first index B69a may be
shielded by the light-emitting diode substrate B3 and cannot be
recognized visually to confirm the mistake in allocation direction
of the light-emitting diode substrate B3. The second marker B38 is
formed by caving in width-directional two sides of the one
length-directional end place, the second index B69b is arranged
into this marker B38 so that if the first and second substrate of
the light-emitting diode substrate B3 are arranged mistakenly, the
second index B69b may be shielded by the light-emitting diode
substrate B3 and cannot be recognized visually to confirm the
mistake in kind of the light-emitting diode substrate B3.
<Configuration of Lens B2>
[0262] As shown in FIGS. 6 and 11, the lens B2 faces the top of the
light-emitting diode B1 apart from it and includes a thick
disc-shaped translucent portion B21 having a hemispherical recess
portion for diffusing light emitted from this light-emitting diode
B1 in all directions and three projections B22 that project toward
the light-emitting diode substrate B3 from a face of this
translucent portion B21 that faces the light-emitting diode B1 in a
configuration that the tip of this projection B22 is attached
around the light-emitting diode B1 on one surface of the
light-emitting diode substrate B3 by using an adhesive agent. FIG.
12 shows a light emission amount as a function of a light emission
angle of light emitted by the light-emitting diode. The light
emission amount is measured at a position 20 mm apart from the
light-emitting diode B1. FIG. 12 shows that no light is emitted at
a light emission angle of at least 70 degrees with respect to a
light emission angle of zero degree (at the top of the
light-emitting diode B1).
<Configuration of Shaft Body B7>
[0263] The shaft body B7 fitted into the first attachment hole B64
to fix the both ends of the light-emitting diode substrate B3 is
common to the shaft body B7 fitted into the second attachment hole
B65 to inhibit the reflection sheet B5 from deviating in a
direction away from the light-emitting diode substrate B3. Since
the through holes B33 and B34 are formed at the respective two ends
of the light-emitting diode substrate B3, the shaft body B7 is
fitted through those through holes B33 and B34 at those ends into
the first attachment hole B64 so that in a configuration that the
plurality of light-emitting diode substrates B3 are arranged as
shown in FIG. 10, both ends of the light-emitting diode substrate
B3 can be fixed securely without forgetting to fit in the shaft
body B7 or fitting it mistakenly. As shown in FIGS. 13A, 13B, 14A,
and 14B, the shaft body B7 has a synthetic resin-made flexible tube
B71 and a synthetic resin-made pin B72 fitted into this flexible
tube B71. The flexible tube B71 has a small-diameter head portion
B71a at its one end and a plurality of axis length-directional
slits B71b and an inward expanding bulgy portion, in a
configuration that a portion piece between the slits B71b is
axially flexible, the flexible tube B71 is fitted into the through
hole B33 or B34 and the first attachment hole B64, and the head
portion B71a comes in contact with one surface of the
light-emitting diode substrate B3 to press the light-emitting diode
substrate B3 to the plate portion B61.
[0264] The pin B72 faces the head portion B71a of the flexible tube
B71 in the axis length direction and has a head portion B72a at its
one end which head portion is larger in diameter than this head
portion B71a in such a configuration that if this head portion B72a
is fitted into the flexible tube B71, the portion piece between the
slits B71b of the flexible tube B71 may expand axially outward
outside the attachment hole B64 so cannot come out of the
attachment hole B64 to give rise to a space larger in length than
the thickness of the reflection sheet B5 between the inner rim
surface of the head portion B72a and one surface of the
light-emitting diode substrate B3 so that if the reflection sheet
B5 expands thermally owing to heat occurring upon emission of light
by the light-emitting diode B1, expansion and contraction of the
reflection sheet B5 owing to the thermal expansion may be tolerated
to prohibit the reflection sheet B5 from getting wrinkles. As shown
in FIGS. 14A and 14B, the pin B72 may come in a type having the
circular head portion B72a and a type having the oval head portion
B72a. The pin B72 having an oval head portion B72a has a whirl-stop
hole B60 and a whirl-stop pin B73 integrally formed on one side in
the length direction of the head portion B72a which pin B73 is
fitted into one of the positioning recesses B35.
[0265] The shaft body B7 is formed so that its size from one
surface of the light-emitting diode substrate B3 to the top of the
head portion B72a may be smaller in length than its size from the
one surface of the light-emitting diode substrate B3 to the top of
the lens B2 as shown in FIG. 6 to inhibit light diffused by the
lens B2 from interfering with the head portion B72a of the shaft
body B7 so that the shaft body B7 can be prevented from giving rise
to irregularities in luminance.
[0266] An inner surface of the head portion B72a that faces one
surface of the light-emitting diode substrate B3 has a plurality of
recesses B74 that cave in toward the top except one circumferential
portion and are open to the rim as shown in FIG. 15. Between the
recess B74 and one surface of the light-emitting diode substrate
B3, a space where the peak of a tool such as a standard screwdriver
is inserted is provided by the recess B74 and configured so that
the pin B72 can be easily pulled out of it with the tool. Although
the recesses B74 are evenly spaced to three positions as shown in
FIG. 13B, they may be evenly spaced to four positions or the number
of them is not limited in particular and may be one or two.
<Configuration of Reflection Sheet B5>
[0267] The reflection sheet B5 is formed of a synthetic resin-made
sheet material having high reflectivity and, as shown in FIGS. 5
and 16, has a roughly rectangular flat portion B51 and a frame
portion B52 that is bent at a first fold B5a formed at a rim of
this flat portion B51 and, when is bent at it, shaped like a
case.
[0268] The flat portion B51 has formed in it with a first hole B53
in which each of the lenses B2 arranged in a grid is disposed, a
second hole B54 into which the shaft body B7 fixing the
light-emitting diode substrate B3 is fitted, and a third hole B55
into which the shaft body B7 inhibiting the support pin B8 or the
reflection sheet B5 from deviating in the direction away from the
light-emitting diode substrate B3 is fitted and has a pair of slits
B56 facing each other in parallel and apart from each other along
the sheet surface which are formed at a position facing each of the
connector B4 in a configuration that if the reflection sheet B5 is
placed on the plurality of light-emitting diode substrates B3
connected with the connector B4, a portion between the pair of
slits B56 may deviate in the thickness direction and the reflection
sheet B5 can reflect light also at the portion facing the connector
B4 and also continues to the one central second hole B54 to have a
long hole B57 formed in it that faces the whirl-stop hole B60 via
one of the positioning recesses B35 as shown in FIG. 16.
[0269] As shown in FIG. 17, between a corner B51a of the flat
portion B51 and the rim of a corner B52a of the frame portion B52,
three divergent second folds B5b are formed ranging from the corner
B51a of the flat portion B51 to the rim of the corner B52a of the
frame portion B52 so that no gap or step may occur at the corner
B52a of the frame portion B52 by folding the flat portion B51 at
the second fold B5b.
[0270] As shown in FIG. 11, the first hole B53 is formed somewhat
larger in diameter than a translucent portion B21 of the lens B2
and the translucent portion B21 is disposed on the side of the
optical sheet C more than the flat portion B51 so that expansion
and contraction of the reflection sheet B5 due to thermal
expansion, if any, of the reflection sheet B5 caused by light
emitted from the light-emitting diode B1 may be tolerated by the
gap between the rim of the translucent portion B21 and the first
hole B53. The second hole B54 is smaller than the first hole B53
but larger than the head portion B72a and continues to one side of
the neighboring first hole B53, thereby enabling absorbing
expansion and contraction of the reflection sheet B5 owing to its
thermal expansion. Further, the one central second hole B54, that
is, the second hole B54 to which the long hole B57 continues is
separate from the first hole B53.
[0271] The third hole B55 is formed smaller than the second hole
B54 and the head portion B71a of the flexible tube B71. A
minute-hole identification portion B55a is formed around the third
hole B55 into which the support pin B8 is inserted but not around
the third hole B55 into which the shaft body B7 that inhibits the
reflection sheet B5 from deviating in a direction away from the
light-emitting diode substrate B3 is fitted. The identification
portion B55a is disposed at a position where it is larger in
diameter than the head portion B72a of the shaft body B7 so that if
the shaft body B7 is fitted into the third hole B55 mistakenly
instead of the support pin B8, the identification portion B55a may
be exposed so that the mistake can be recognized.
[0272] As shown in FIG. 16, the pairs of slits B56 are formed apart
in a direction (perpendicular to the lines) in which the group of
circuit boards are arranged in a plurality of lines in condition
where the facing direction of each of the pairs may be different
alternately so that those slits B56, B56 may deviate in the
thickness direction starting from a non-slit portion between their
respective ends and the deviating portion may face each of the
connectors B4. In this configuration, the portion facing each
connector B4 has the high-reflectivity reflection sheet B5 and
deviates starting from the non-slit portion between the respective
ends of the slits B56, B56, so that an angle of a portion ranging
from the top of the deviating portion to the non-slit portion
inclined with respect to the flat portion B51 can be reduced.
Therefore, as shown in FIG. 4, even in a case where the number of
the connectors B4 arranged is relatively large, it is possible to
reduce the inclination angle due to the deviation of the portion
that faces each connector B4 to raise the light reflectivity in a
direction perpendicular to the sheet surface, thereby maintaining
even more appropriate luminance characteristics.
[0273] As shown in FIG. 14B, the one central second hole B54 with
which the long hole B57 continues is smaller in diameter than the
head portion B71a of the flexible tube B71, so that only the
periphery of one of the second holes B54 in the reflection sheet B5
is pressed by the head portion B71a to one surface of the
light-emitting diode substrate B3 so that the reflection sheet B5
may be positioned irrespective of expansion or contraction of the
reflection sheet B5 caused by its thermal expansion. The long hole
B57 serving as a misalignment prevention hole has mostly the same
width size as the whirl-stop pin B73 and long in a direction away
from the one central second hole B54 so that it can come in contact
with the circumference surface of the whirl-stop pin B73 to prevent
the reflection sheet B5 from being misaligned in the
circumferential direction of the reflection sheet B5, thereby
maintaining its positional relationship with the lens B2 in the
first hole B53.
<Configuration of Support Pin>
[0274] As shown in FIG. 18, the support pin B8 has a synthetic
resin-made flexible tube B81, a synthetic resin-made pin B82 fitted
into this flexible tube B81, and a columnar portion B83 integrally
formed with this pin B82. The flexible tube B81 has a
small-diameter head portion B81a at its one end and, at the other
end, a plurality of axis length-directional slits B81b and an
inward expanding bulgy portion, in a configuration that a portion
piece between the slits B81b is axially flexible, the flexible tube
B81 is fitted into the third hole B55 and the second attachment
hole B65, and the head portion B81a comes in contact with one
surface of the light-emitting diode substrate B3 to press the
light-emitting diode substrate B3 to the plate portion B61.
[0275] The pin B82 faces the head portion B81a of the flexible tube
B81 in the axis length direction and has a head portion B82a at its
one end which head portion B82a is larger in diameter than this
head portion B81a and the head portion B72a of the shaft body B7 in
such a configuration that if this head portion B82a is fitted into
the flexible tube B81, the portion piece between the slits B81b of
the flexible tube B81 may flex axially outward outside the second
attachment hole B65 so cannot come out of the second attachment
hole B65 to give rise to a space larger in length than the
thickness of the reflection sheet B5 between the inner rim surface
of the head portion B82a and one surface of the light-emitting
diode substrate B3 so that if the reflection sheet B5 expands
thermally owing to heat occurring upon emission of light by the
light-emitting diode B1, expansion and contraction of the
reflection sheet B5 owing to the thermal expansion may be tolerated
to prohibit the reflection sheet B5 from getting wrinkles. The
columnar portion B83 is roughly shaped like a cone from the head
portion B82a and configured so that its tip may face the optical
sheet C somewhat apart from it to inhibit the optical sheet C from
flexing toward the light-emitting diode substrate B3. The head
portion B82a is formed to be large enough to shield the
identification portion B55a of the reflection sheet B5 when the
support pin B8 is fitted into the third hole B55 so that if the
shaft body B7 is fitted into the third hole B55 mistakenly, the
identification portion B55a may be exposed out of the head portion
B82a.
<Configuration of Lead Wire Holding Jig>
[0276] As shown in FIGS. 19, 20, and 22, the lead wire holding jig
B9 has a roughly rectangular protection tube B91 that is attached
around the lead hole B61a by fitting and a lid B92 that blocks up
an open end of this protection tube B91. Inside the protection tube
B91, a recess B91a disposed in parallel with the plate portion B61
and continuing to the lead hole B61a is formed so that the lead
wires B40 lead from the lead hole B61a can be bundled. A
convex-shaped to-be-engaged portion B91b which is inserted into the
recess B61b to engage with the edge portion of the lead hole B61a
by sliding is provided at the open end on one side of the
protection tube B91, a pivotally supporting convex portion B91c is
provided on one side of the protection tube B91, and a to-be-locked
portion B91d which is locked to the lock portion B61c is provided
on the other side of the protection tube B91, so that the
protection tube B91 is attached to the periphery of the lead hole
B61a by the to-be-engaged portion B91b and the to-be-locked portion
B91d. At the open portion on the other side of the protection tube
B91, a plurality of recess-shaped retaining portion B91e are
provided.
[0277] The lid B92 is shaped like a plate and has a to-be-locked
portion B92a which is locked to the pivotally supporting convex
portion B91c on one side of its rim and a convex-shaped
to-be-retained portion B92b which is retained to the retaining
portion B91e on the other side, in a configuration that when the
lid B92 is swung in the closing direction using the to-be-locked
portion B92a as a supporting point in order to block up the open
end of the protection tube B91, the lead wires B40 bundled in the
recess B91a may be sandwiched between the recess B91a in the
protection tube B91 and the lid B92. Accordingly, as shown in FIG.
2, it is possible to quickly bundle and hold in the recess B91a the
lead wires B40 of the connector B2 connected to the circuit board
group, thereby simplifying processing to wire the lead wires
B40.
<Configuration of Optical Sheet C>
[0278] The optical sheet C is a stack obtained by stacking a
relatively thick diffusion plate for diffusing light emitted by the
light-emitting diode B1 serving as the light source and relatively
thin synthetic resin sheets such as a reflective polarization
plate, a prism sheet, and a diffusion sheet and has its rim
supported by the collar piece B63 of the substrate support body
B6.
<Configuration of Cabinet D>
[0279] The cabinet D has a cabinet front divided unit D1 for
shielding the front side of the rim of the display unit A and a
bowl-shaped cabinet rear divided unit D2 for shielding the rim and
the rear side of the light source device B and is attached to the
collar piece B63 of the substrate support body B6 with male
screws.
[0280] The display device having such a configuration is assembled
in the following steps of (1) to (8).
[0281] (1) The display panel A1 is placed on the rear holding frame
A3 flatly placed on a work station, the front holding frame A2 is
placed on this display panel A1, and those front holding frame A2
and rear holding frame A3 are bound with male screws to form the
display unit A.
[0282] (2) The substrate support body B6 on which the circuit board
B10 is not mounted is flatly placed on another work station in
condition where its open end turns up and the plurality of
light-emitting diode substrates B3 neighboring each other in one
direction are arranged in a plurality of lines on one surface of
the plate portion B61 of this substrate support body B6 as shown in
FIG. 7. In this case, of the light-emitting diode substrates B3
neighboring each other in the one direction, for example, the short
light-emitting diode substrates each of which is mounted with the
five light-emitting diodes B1 are arranged in a plurality of lines,
then the medium-length light-emitting diode substrates each of
which is mounted with the six light-emitting diodes B1 are arranged
in a plurality of lines, and then the short light-emitting diode
substrates each of which is mounted with the five light-emitting
diodes B1 are arranged in a plurality of lines, thereby configuring
the circuit board group. To the short light-emitting diode
substrates arranged first, the second connector B41 is connected
beforehand, the medium-length light-emitting diode substrates are
connected with the connector B4, and to the short light-emitting
diode substrates arranged last, a short connector is connected.
[0283] The plate portion B61 has the positioning convex portion B68
as well as the first index B69a and the second index B69b formed on
it and the light-emitting diode substrate B3 has the positioning
recess B35 as well as the first marker 37 and the second marker 38
formed on it, so that when configuring the circuit board group, by
engaging the positioning recess B35 in the light-emitting diode
substrate B3 with the positioning convex portion B68, the
light-emitting diode substrates B3 having the different lengths can
be simply arranged to appropriate positions, and by aligning the
first marker 37 with the first index B69a and the second marker 38
with the second index B69b, it is possible to simply arrange to
appropriate positions the light-emitting diode substrates B3 that
are different in connecting portion structure at both ends and in
order in which the high-luminance and low-luminance light-emitting
diodes B1 are arranged. When arranging the light-emitting diode
substrates to which the second connector B41 is connected, the lead
wire B40 of the second connector B41 is led from the lead hole B61a
to the outside of the substrate support body B6.
[0284] (3) Both ends of each of the light-emitting diode substrates
B3 arranged in the substrate support body B6 are fixed to the plate
portion B61 by the shaft body B7. In this case, the shaft body B7
is inserted sequentially through the through holes B33 and B34
formed in both ends of each of the light-emitting diode substrates
B3 and fitted into the attachment hole B64 in the plate portion
B61, thereby fixing each of the light-emitting diode substrates B3
to the substrate support body B6. In this case, the shaft body B7
is fitted into the through hole B33 formed in one end of the
light-emitting diode substrate B3 and then fitted into the through
hole B34 formed in the other end of the light-emitting diode
substrate B3. The through hole B33 into which the shaft body B7 is
fitted first is smaller than the through hole B34 into which it is
fitted later, so that even if the through hole B34 formed in the
other end is somewhat shifted with respect to the attachment hole
B64, this shift in position can be absorbed to fix the
light-emitting diode substrate B3, thereby preventing overloads
from being applied to the connector B4. The shaft body B7 is fitted
in the next process into the one central attachment hole B64 into
which the shaft body B7 having the whirl-stop pin B73 is to be
fitted.
[0285] (4) The reflection sheet B5 is placed on one surface of the
light-emitting diode substrate B3 fixed to the plate portion B61 of
the substrate support body B6 and the rim of this reflection sheet
B5 is placed on the collar piece B63 of the substrate support body
B6. In this situation, the lens B2 is disposed in the first hole
B53 in the reflection sheet B5.
[0286] (5) Either one of the support pin B8 and the shaft body B7
that inhibits the reflection sheet B5 from deviating in a direction
away from the light-emitting diode substrate B3 is fitted into the
third hole B55 in the reflection sheet B5 and the fit-in hole B36
and the second attachment hole B65 sequentially. In this situation,
the head portion B72a of the shaft body B7 is larger in diameter
than the third hole B55 and the inner face of this head portion
B72a faces the periphery of the third hole B55 in the reflection
sheet B5, so that the reflection sheet B5 can be prevented from
deviating in a direction away from the light-emitting diode
substrate B3.
[0287] The flexible tube B71 of the shaft body B7 having the
whirl-stop pin B73 is fitted into the one central second hole B54
in the reflection sheet B5, so that the whirl-stop pin B73 can be
fitted into the long hole B57, the one positioning recess B35, and
the whirl-stop hole B60, thereby preventing the reflection sheet B5
from being shifted in the circumferential direction of the
reflection sheet B5.
[0288] (6) The optical sheet C is placed on the rim of the
reflection sheet B5 placed on the collar piece B63 of the substrate
support body B6, the display unit A is placed on this optical sheet
C, a male screw is inserted through the insertion hole formed in
the rim of this display unit A and screwed into the attachment hole
formed in the collar piece B63 to thereby sandwich the optical
sheet C between the display unit A and the substrate support body
B6 and fix the display unit A to the substrate support body B6. In
this situation, the support pin B8 can inhibit the optical sheet C
from flexing.
[0289] (7) The display unit A turns down, the substrate support
body B6 is turned over on the work station so that it may turn up,
the plurality of circuit boards B10 are attached to the third
attachment hole B66 in the plate portion B61, and the lead wires
B40 of the second connector B41 are bundled and held by the lead
wire holding jig B9.
[0290] (8) The display unit A is placed on the cabinet front
divided unit D1 flatly placed on the work station so that it may
turn down, the cabinet rear divided unit D2 is placed on the
substrate support body B6, the rim side of the cabinet rear divided
unit D2, the collar piece B63 of the substrate support body B6, and
the rim side of the cabinet front divided unit D1 are bound with
male screws to form the display device.
<Another Configurations of Display Device>
[0291] FIG. 23 is a development view showing another configuration
of the corner of the reflection sheet, FIG. 24 is a front view
showing another configuration of the portion that faces the
connector of the reflection sheet, FIG. 25 is a front view showing
another configuration of the light source device, FIG. 26 is a
schematic front view showing another configuration of the substrate
support body, FIG. 27 is a schematic front view showing another
configuration of the reflection sheet, and FIG. 28 is a
cross-sectional view showing another relationship between the
reflection sheet and the shaft body.
<Another Configuration of Reflection Sheet B5>
[0292] As shown in FIG. 23, a roughly V-shaped defect portion B58
may be formed at the corner B52a of the frame portion B52 of the
reflection sheet B5 so that when the four frame portions B52
continuing to the four sides of the flat portion B51 at the first
fold B5a are obliquely folded with respect to the flat portion B51,
two edges B58a of the defect portion B58 may agree and this
agreement condition may be held by binding means such as
double-faced tape.
[0293] As shown in FIG. 24, a portion of the reflection sheet B5
that faces the connector B4 may have two slits B59 formed in it
that are shaped like letter C and each have longer sides facing the
sheet surface apart from it in a direction along it and two shorter
sides extending from this longer side's two ends respectively along
a direction in which they get near each other respectively and
deviate in parallel with the sheet surface starting from two
deviation start points between the slits B59, B59, thereby
improving performance of deviation in the thickness direction of
the portion that faces the connector B4.
<Another Relationship Between the Shaft Body B7 and Reflection
Sheet B5>
[0294] Since the shaft body B7 fixing both ends of the
light-emitting diode substrate B3 has worse optical reflectivity
than the reflection sheet B5, the shaft body B7 fixing one end of
the light-emitting diode substrates B3 arranged in a plurality of
lines as shown in FIG. 25 may be disposed in a zigzag manner in a
direction perpendicular to the line direction and the shaft body B7
fixing the other end of the light-emitting diode substrate B3 may
be disposed in a zigzag manner in a direction that orthogonally
intersects with the line direction so that a position where
irregularities in luminance occur owing to the shaft bodies B7 can
be expanded and hardly be recognized.
[0295] In this situation, the first attachment hole B64 and the
positioning convex portion B68 neighboring each other in the
direction that orthogonally intersects with the line direction of
the light-emitting diode substrates B3 deviate in this line
direction and are arranged in a zigzag manner as shown in FIG. 26.
The light-emitting diode substrate B3 includes a first
light-emitting diode substrate that has a smaller size from both
ends to the through holes B33 and B34 and a second light-emitting
diode substrate that has a larger size from both ends to the
through holes B33 and B34 in a configuration that the first and
second light-emitting diode substrates are alternately arranged in
a direction perpendicular to the line direction, to arrange the
through holes B33 and B34 in a zigzag manner corresponding to the
first attachment holes B64 arranged in a zigzag manner, finally
arranging the shaft bodies B7 fitted into the through holes B33 and
B34 in a zigzag manner in a direction perpendicular to the line
direction.
[0296] Besides the configuration in which the long hole B57 for
preventing the reflection sheet B5 from shifting circumferentially
continues to one second hole B54 disposed at the midsection of the
reflection sheet B5, another configuration may be employed in which
the long hole B57 would be one of the second holes B54 disposed on
the rim side of the reflection sheet B5 as shown in FIG. 28. In
this case, the long hole B57 has mostly the same-sized width as the
head portion B71a of the shaft body B7 and is longer in a direction
away from the one second hole B54 disposed at the midsection so
comes in contact with the circumferential surface of the head
portion B71a to prevent the reflection sheet B5 from shifting
circumferentially, while into the second hole B54 disposed at the
midsection of the reflection sheet B5, the shaft body B7 having the
circular head portion B72a is fitted instead of the pin B72 having
the oval head portion B72a. Besides the configuration in which the
long hole B57 continues to the first hole B53 in the reflection
sheet B5 as shown in FIG. 28, another configuration may be employed
in which it is separate from the first hole B53.
[0297] The following will describe in detail the embodiments 1-1 to
12-2 of the present invention with reference to the drawings. The
reference numerals denoting components corresponding to those in
FIGS. 1 to 28 are parenthesized here to clearly define their
equivalence to those in FIGS. 1 to 28.
Embodiment 1-1
[0298] FIG. 29 is a perspective view showing a configuration of a
light source device according to the present invention, FIG. 30 is
a plan view showing the configuration of the light source device,
FIG. 31 is a plan view showing a configuration in which a
reflection sheet of the light source device is omitted, and FIG. 32
is a partially enlarged cross-sectional view showing the
configuration of the light source device.
[0299] The shown light source device (B) includes a plurality of
light-emitting diodes 1 (B1) that are mounted on the rear side of a
roughly rectangular solid-shaped display unit (A) of a thin-type
display device including a display surface on its front side and
this display unit and that serve as light sources arranged on a
grid, a plurality of light-emitting diode substrates 2 (B3) mounted
with those light-emitting diodes 1 on one surface 2a and arranged
in a plurality of lines, a plurality of connectors 3 (B4)
interconnecting the neighboring light-emitting diode substrates 2,
a plurality of lenses 4 (B2) mounted on the one surface 2a of the
light-emitting diode substrate 2 so that they may face the top of
the light-emitting diode 1 and diffuse light emitted by this
light-emitting diode 1, a reflection sheet 5 (B5) having a through
hole 5a (first hole B53) in which the lens 4 is disposed and facing
the one surface 2a and one surface of the connector 3 to reflect
light diffused by the lens 4, and a support case 6 (substrate
support body B6) housing and supporting the light-emitting diode
substrates 2 in condition where they are arranged in a plurality of
lines.
[0300] The light-emitting diode substrates 2 are each shaped like
an oblong having a circuit portion on its one surface 2a and
arranged on one surface 6a of the roughly rectangular support case
6 in condition where they are arranged in a plurality of lines
apart from each other in a length direction and a width direction.
On the one surface 2a of each of the light-emitting diode
substrates 2, the plurality of light-emitting diodes 1 are mounted
apart from each other in the length direction and connecting
portions 21 and 22 (B31, B32) are provided at the
length-directional two ends of the one surface 2a as shown in FIG.
31.
[0301] Of the light-emitting diode substrates 2 arranged in the
plurality of lines so that their respective one length-directional
ends may face each other, the light-emitting diode substrates 2 in
each line have the neighboring two connecting portions 21, 21
connected by the connector 3 to each other in a configuration that
the connecting portion 22 on one light-emitting diode substrate 2
is connected by a second connector (B41) to a power supply circuit
board mounted on the rear surface of the support case 6 and a short
connector is connected to the connecting portion 22 of the other
light-emitting diode substrate 2.
[0302] The support case 6 is formed of a metal plate and has a
roughly rectangle-shaped flat plate portion 61 (B61) and a frame
portion 62 (B62) that continues to the rim of this plate portion 61
and is open at its front end in a configuration that the
light-emitting diode substrates 2 are housed and supported on a
front surface 6a of the plate portion 61 as arranged in a length
direction and a width direction. The frame portion 62 is formed by
folding frame pieces that continue to the four sides of the plate
portion 61 respectively.
[0303] The plate portion 61 is mounted on its rear surface with a
plurality of circuit boards (B10) such as a power supply circuit
board connected with the second connector to the connecting portion
22 of the light-emitting diode substrate 2, a control circuit board
for driving and controlling the display unit and the like.
[0304] FIG. 33 is a plan view showing a configuration of the
reflection sheet, FIG. 34 is an enlarged front view showing a
configuration of main portions in condition where the reflection
sheet is spread out, FIG. 35 is an enlarged front view showing a
configuration of the main components of the reflection sheet, and
FIG. 36 is an enlarged lateral plan view showing a configuration of
a reflection sheet portion. The reflection sheet 5 (B5) is made of
one rectangular synthetic resin-made sheet material having high
reflectivity and has a flat portion 51 (B51) smaller than the plate
portion 61 of the support case 6 and a frame portion 52 (B52)
continuing to all rims of this flat portion 51 at four first folds
5b (B5a) at which it can be folded as well as a second fold 53
(B5b) perforated between a corner 51a (B51a) of each flat portion
51 and a corner 52a (B52a) of the frame portion 52 so that if it is
folded at the first fold 5b and the second fold 53, the frame
portion 52 may tilt outward with respect to the frat portion 51 to
provide a case shape with the front side being open. The first fold
5b and the second fold 53 are perforations.
[0305] There are the three second folds 53 divergent from the
corner 51a of the flat portion 51 toward the rim of the corner 52a
of the frame portion 52, so that if the sheet is valley-folded at
the central fold 53a and mounted-folded at the two folds 53b, 53b
on its both sides, those folds 53b, 53b on both sides agree without
a thickness-directional step. At the outer edge of the corner 52a
of the frame portion 52, an L-shaped defect portion 54 is
formed.
[0306] Two folded portions 53c, 53c folded at the three folds 53a,
53b, and 53b are combined into the shape of a plate and bound with
adhesive tape 55 such as double-faced tape so that the folded
condition of the frame portion 52, in other words, the shape of the
frame portion 52 can be maintained.
[0307] A site of the flat portion 51 that faces the outer edge of
the connector 3 is provided with a deviation portion that can
deviate in the thickness direction at a plurality of slits that
mutually face apart from each other in a direction along the sheet
surface, while a site of the flat portion 51 that corresponds to
each of the lenses 4 has the through hole 5a (first hole B53)
formed in it that is somewhat larger in diameter than this lens 4
so that the lens 4 is disposed in this through hole 5a.
[0308] The reflection sheet 5 continues to the four sides of the
frame portion 52 having a rectangular rim via a third fold 5c and
is integrally formed with four collar portions 56 that extend
outward in parallel with the flat portion 51.
[0309] The two collar portions 56, 56 that face each other in the
length direction of the reflection sheet 5 has a projecting portion
56a that projects from both ends of those collar portions 56 in the
length direction of the collar portions 56, 56 rather than the
defect portion 54 so that when the corners 52a agree at the three
second folds 53, one side edge of this projecting portion 56a may
abut against both end edges of the remaining two collar portions
56, 56, giving rise to no gap between the two ends of each of the
collar portions 56.
[0310] As shown in FIG. 31, for example, the five or six
light-emitting diodes 1 are mounted on the light-emitting diode
substrate 2 in condition where they are apart in its length
direction in a configuration that for each of the light-emitting
diodes 1, the five or six lenses 4 are attached to the one surface
2a with an adhesive agent.
[0311] The lens 4 (B2) faces the top of the light-emitting diode 1
apart from it and has a translucent portion (B21) having a
semispherical recess for diffusing light emitted from this
light-emitting diode 1 in all directions and three positioning
projections (B22) that project toward the light-emitting diode
substrate 2 from a face of this translucent portion that faces the
one surface 2a so that the translucent portion may be positioned
with respect to the light-emitting diode substrate 2, in a
configuration that the tip of this positioning projecting portion
is attached to the one surface 2a with an adhesive agent. This
positioning projection makes a distance between the translucent
portion and the light-emitting diode substrate 2 somewhat larger
than the thickness of the reflection sheet 5 so that thermal
expansion of the reflection sheet 5 can be absorbed.
[0312] In the light source device having such a configuration, the
support case 6 is placed on a work station so that its open side
may turn up, the two light-emitting diode substrates 2 neighboring
each other in the line direction are arranged in a plurality of
lines in the front face of the plate portion 61 of the support case
6, the connector 3 is connected to the connecting portions 21, 21
provided at the neighboring ends of the light-emitting diode
substrates 2 in each line, and the reflection sheets 5 are placed
on the one surface 2a of the light-emitting diode substrate 2 in
each line in condition where they face each other. Since the
reflection sheet 5 is shaped like a case having the open front
side, the flat portion 51 faces the one surface 2a of the
light-emitting diode substrate 2 and the plate portion 61 of the
support case 6 and the frame portion 52 faces the frame portion 62
of the support case 6, so that the entire surface in the support
case 6 serves as a reflection surface.
[0313] The flat portion 51 and the frame portion 52 of the
reflection sheet 5 are formed by folding one sheet of a synthetic
resin-made sheet material at the first fold 5b and the second fold
53, so that the case-shaped reflection sheet 5 can be easily
obtained without giving rise to a gap and, even if dust or dirt
enters the support case 6, the dust or dirt in this support case 6
can be prevented from entering the reflection sheet 5. Further, the
corners 52a of the frame portion 52 of the case-shaped reflection
sheet 5 mutually agree at the three second folds 53 in such a
manner as not to give rise to a thickness-directional step, so that
it is possible to improve luminance characteristics at the corner
52a of the frame portion 52, thereby preventing a shadow from
occurring at the corner 52a of the frame portion 52. Further, the
rim of the corner 52a of the frame portion 52 has the roughly
L-shaped defect portion 54, so that it is possible to prohibit the
rim of the corners 52a agreeing at the second fold 53 from
projecting to the outside.
[0314] FIG. 37 is a cross-sectional view showing a configuration of
a display device including a light source device according to the
present invention. The display device has a display surface for
displaying a TV image on its front side and includes a roughly
rectangular solid-shaped display unit 70 (A), a light source device
A (B) disposed behind this display unit 70, and a cabinet 71 (D)
for shielding the rim of the display unit 70 and the rear side of
the light source device A.
[0315] The display unit 70 (A) has a display panel 72 (A1) having a
display surface and an optical sheet 73 (C) disposed behind this
display panel 72. The rim of the display panel 72 is held in
condition where it is sandwiched by a front holding frame body 74
(A2) and a rear holding frame body 75 (A3) between the front and
the rear, to configure a panel module in which the rear holding
frame body 75 is attached to the rim of the support case 6.
[0316] The optical sheet 73 is a stack obtained by stacking a
relatively thick diffusion plate for diffusing light emitted by the
light-emitting diode 1 serving as the light source and relatively
thin synthetic resin sheets such as a reflective polarization
plate, a prism sheet, and a diffusion sheet.
[0317] The support case 6 has the frame body 62 that continues to
the plate portion 61 and the rim of this plate portion 61 and
supports the rim of the diffusion plate on this frame portion
62.
[0318] The cabinet 71 has a cabinet front divided unit 71a (D1) for
shielding the front side of the rim of the display unit 70 and a
bowl-shaped cabinet rear divided unit 71b (D2) for shielding the
rim and the rear side of the light source device A and is attached
to the frame portion 62 of the support case 6 with male screws.
Embodiment 1-2
[0319] FIG. 38 is an exploded front view showing another
configuration of main components of a reflection sheet included in
a light source device according to the present invention. Instead
of forming the three second folds 53 at a corner of a frame portion
52 in a reflection sheet 5 (B5), this light source device has a
roughly V-shaped defect portion 57 at a corner 52a of the frame
portion 52 so that when the four frame portions 52 continuing to
the four sides of a flat portion 51 at a first fold 5b are
obliquely folded with respect to a flat portion 51, two edges 57a,
57a of the defect portion 57 may agree and this agreement condition
may be held by double-faced tape 55.
[0320] The reflection sheet 5 made of one rectangular synthetic
resin-made sheet material has the flat portion 51 smaller than the
plate portion 61 of the support case 6 and the four frame portions
52 continuing to the four sides of this flat portion 51 at the
first folds 5b, so that by folding each of the frame portions 52 at
the first fold 5b obliquely with respect to the flat portion 51,
this sheet is shaped like a case in which the frame portions 52 are
inclined outward with respect to the flat portion 51 and the two
edges 57a, 57a of the defect portion 57 agree. By applying
double-faced tape 55 to the outer surfaces of both ends of the
neighboring frame portions 52 in this condition, the shape of the
case can be maintained. By integrally forming a folded piece
continuing at the fourth fold with one of the ends of the
neighboring frame portions 52, it is possible to easily bind the
folded piece and the other end of the neighboring frame portions 52
by using the double-faced tape.
[0321] The other configurations and functions are almost the same
as those of the embodiment 1-1, so that identical reference
numerals are given to identical components, and detailed
description on the identical components and that on the functions
and effects will be omitted.
Embodiment 1-3
[0322] FIG. 39 is an exploded front view showing another
configuration of the main components of the reflection sheet
included in the light source device according to the present
invention and FIG. 40 is an enlarged front view showing a further
configuration of the main components of the reflection sheet.
Instead of having the defect portion 57 at the corner 52a of the
frame portions 52 on the flat portion 5, this light source device
has three second folds 53 along the rim of the frame portion from a
corner 51a of a flat portion 51 and one slit 58 in a configuration
that the corner 52a of the frame portion 52 is formed at the second
folds 53 and the ends of the frame portions 52 that neighbor each
other at the slit 58 agree to hold the agreement condition and the
corner 52a by using double-faced tape.
[0323] The slit 58 is formed along the facing two sides of the flat
portion 51 from its corners 51a respectively, so that both ends of
the two frame portions continuing to the facing two sides of the
flat portion 51 have a projecting portion a that projects outward
beyond the corner 51a from both ends of the other two frame
portions, which the projecting portion faces both ends of the other
two frame portions.
[0324] The projecting portion has three second folds formed in it
that are divergent from the corner 51a toward the rim (corner of
the projecting portion) of the corner 52a.
[0325] In the present embodiment, by folding each of the frame
portions at the fold and folding the projecting portion at the
three second folds, a case shape having an open front side is
provided in which the frame portions are inclined outward with
respect to the flat portion 51, so that two folded portions formed
at the second folds are bound by a binding member such as
double-faced tape and the edges of the neighboring frame portions
owing to the slit are bound by adhesive tape, thereby holding the
case shape.
[0326] The other configurations and functions are almost the same
as those of the embodiment 1-1, so that identical reference
numerals are given to identical components, and detailed
description on the identical components and that on the functions
and effects will be omitted.
Embodiment 1-4
[0327] FIG. 41A is an exploded front view showing another
configuration of the main components of the reflection sheet and
FIG. 41B shows a further configuration of the main components of
the reflection sheet and is a front view of it in condition where
it is shaped like a case. This light source device has a lock
convex portion and a lock recess for locking this lock convex
portion formed at a corner of a frame portion 52 instead of using
double-faced tape as a binding member for biding the corners of the
frame portion.
[0328] A roughly V-shaped defect portion 57 is formed at the corner
52a of the frame portion 52 so that when the four frame portions 52
continuing to the four sides of a flat portion 51 at a first fold
5b are obliquely folded with respect to a flat portion 51, two
edges 57a, 57a of the defect portion 57 may agree and this
agreement condition may be held by the lock convex portion 59a and
the lock recess 59b.
[0329] The lock convex portion 59a has a retaining lock portion
formed at its tip. The lock recess 59b is formed as a slit, so that
if the lock convex portion 59a is fitted into the lock recess 59b,
the condition in which the two edges 57a, 57a of the defect portion
57 agree with each other is held as shown in FIGS. 40A and 40B.
[0330] The other configurations and operations are almost the same
as those of the embodiment 1-1, so that identical reference
numerals are given to identical components, and detailed
description on the identical components and that on the operations
and effects will be omitted.
Embodiment 1-5
[0331] FIGS. 42 and 43 are plan views showing other configurations
of the reflection sheet included in the light source device
according to the present invention. This light source device has a
roughly V-shaped defect portion 57 divergent from a corner 51a at a
corner 52a of a frame portion 52 on the reflection sheet 5 (B5) so
that when the four frame portions 52 continuing the four sides of a
flat portion 51 at a first fold 5b are folded obliquely with
respect to the flat portion 51, two edges 57b, 57b of the defect
portion 57 may overlap in the thickness direction.
[0332] The edges 57b of the short frame portion 52b of the four
frame portions 52 lap over the long frame portion 52c as shown in
FIG. 42 and the edges 57b, 57b of the long frame portion 52c of the
four frame portions 52 lap over the short frame portion 52b as
shown in FIG. 43 so that no gap may occur between the corners 52a
of the frame portion 52.
[0333] The other configurations and functions are almost the same
as those of the embodiment 1-1, so that identical reference
numerals are given to identical components, and detailed
description on the identical components and that on the functions
and effects will be omitted.
[0334] Although the embodiment 1 have used double-faced tape as the
binding member for binding the corners 52a of the frame portion 52,
it may be replaced by single-sided tape or clips. The corners 52a
of the frame portion 52 may be bound by adhesive agent and the
binding means is not limited in particular.
Embodiment 2-1
[0335] FIG. 44 is a partially enlarged schematic cross-sectional
view illustrating a structure of a light source device in
accordance with the present invention, FIG. 45 is a plan view that
illustrates the light source device one portion of which is
omitted, FIG. 46 is a schematic perspective view that illustrates
one disassembled portion of the light source device, FIG. 47 is a
plan view that illustrates the structure from which a reflection
sheet is omitted, FIG. 48 is a perspective view that illustrates a
structure of a light-emitting diode substrate to which lenses are
attached, and FIG. 49 is a perspective view that illustrates a
structure of a connector.
[0336] The illustrated light source device (B), which has a display
surface on the front side, and is attached to the rear side of a
display unit (A) of a thin display device provided with the display
unit having a substantially rectangular parallelepiped shape, has a
structure provided with a plurality of light-emitting diodes 1 (B1)
that are arranged in a diced pattern and serve as light sources, a
plurality of light-emitting diode substrates 2 (B3) having one
surface 2a on which the light-emitting diodes 1 are assembled,
which are arranged side by side into a plurality of rows, a
plurality of connectors 3 (B4) that connect the adjacent
light-emitting diode substrates 2 mutually with each other, a
plurality of lenses 4 (B2) that are attached to the one surface 2a
of each of the light-emitting diode substrates 2 so as to be
opposed to top portions of the light-emitting diodes 1 in such a
manner so as to diverge light emitted by the light-emitting diode
1, a reflection sheet 5 (B5) that has through holes 51 (B53) in
which the lenses 4 are disposed, and is opposed to the one surface
2a and one surface of the connector 3 in such a manner as to
reflect the light diverged by the lenses 4, and a support body 6
(B6) on which the light-emitting diode substrates 2 are arranged
into a plurality of lines and supported.
[0337] Each of the light-emitting diode substrates 2 has a stripe
pattern, with a circuit portion formed on each of the one surface
2a, and a plurality of those substrates are arranged into a
plurality of lines on one surface 6a of the support body 6 having
the rectangular parallelepiped shape, while being respectively
spaced from one another in its longitudinal direction as well as in
its width direction. On one of the surfaces 2a of each
light-emitting diode substrate 2, a plurality of light-emitting
diodes 1 are assembled in a manner so as to be spaced from one
another in the length direction, as shown in FIG. 47, and
connecting portions 21 and 22 are formed on the two ends in the
length direction of the one surface 2a.
[0338] In the light-emitting diode substrates 2 arranged into a
plurality of lines, with one end thereof facing another opposed end
in the length direction, the light-emitting diode substrates 2 of
each line are connected to each other, with the adjacent two
connecting portions 21, 21 being connected with each other by the
connector 3, and the connecting portion 22 of one of the
light-emitting diode substrates 2 is connected to a power supply
circuit board by a second connector (B41), with a short connector
being connected to a connecting portion 22 of the other
light-emitting diode substrate 2.
[0339] The connector 3 has a substantially rectangular
parallelepiped shape with a plug 31 to be connected to one of the
connecting portions 21, 21 and a receptacle 32 to be connected to
the other connecting portion 21, such that, when connected to the
connecting portions 21, 21, the other surface is joined onto one
surface 2a of the light-emitting diode substrate 2, with the
connector 3 being allowed to protrude from the one surface.
[0340] The reflection sheet 5 having a highly reflective property,
which is composed of one sheet of synthetic resin sheet having a
rectangular shape in association with the support member 6, has a
structure in which two slits 52, 52 (B56, B59) that are separated
from each other in a direction along the sheet surface so as to be
opposed to each other, and formed at portions facing the outer edge
of the connector 3, with a portion between the slits 52, 52 being
formed as a bias portion 53 that can be biased in a thickness
direction. Moreover, the reflection sheet 5 is provided with
through holes 51 formed at portions corresponding to the lenses
4.
[0341] FIG. 50 is an enlarged plan view that illustrates a portion
of the reflection sheet that is opposed to the connector, and FIG.
51 is an enlarged perspective view that shows a state in which the
portion of the reflection sheet facing the connector is biased in a
thickness direction. The two slits 52 (B59) are formed into a
U-letter shape by long sides 52a, 52a that are spaced from each
other in directions along the sheet surface, and opposed to each
other, and two short sides 52b, 52b that are directed toward sides
that make separated distances from the two ends of the long sides
52a, 52a shorter, and non-slit portions 52c, 52c between the two
ends of the slits 52, 52 are connected to the bias portion 53
between the slits 52, 52 so that the bias portion 53 can be biased
in a thickness direction from the non-slit portions 52c, 52c
serving as starting portions of the bias.
[0342] Between the two slits 52, 52, two second slits 54, 54 having
a substantially U-letter shape are formed such that long sides 54a,
54a in the center are separated from short sides 52b, 52b and
opposed thereto, with short sides 54b, 54b on the two ends being
separated from the long sides 52a, 52a and opposed thereto. The
second slits 54, 54 have such a structure that non-slit portions
54c, 54c between the two ends are connected to the center portion
of the long sides 52a, 52a so that the bias portion 53 is biased in
a thickness direction from the non-slit portions 54c, 54c serving
as starting portions of the bias.
[0343] Between the two second slits 54, 54, two third slits 55, 55
having a substantially U-letter shape are formed such that long
sides 55a in the center are separated from short sides 54b, 54b,
and opposed thereto, with short sides 55b, 55b on the two ends
being separated from the long sides 54a, 54a, and opposed thereto.
The third slits 55, 55 have such a structure that non-slit portions
55c, 55c between the two ends are connected to the center portion
of the long sides 54c so that the bias portion 53 is biased in a
thickness direction from the non-slit portions 55c, 55c serving as
starting portions of the bias.
[0344] The through holes 51, each having a round shape with a
diameter slightly larger than that of the lens 4, are disposed in a
diced pattern, with the lenses 4 being disposed therein.
[0345] As illustrated in FIG. 48, five or six of the light-emitting
diodes 1 are assembled in the length direction of the
light-emitting diode substrate 2, in a manner so as to be spaced
apart from each other, and five or six of the lenses 4 are attached
to the one surface 2a thereof with an adhesive in association with
the respective diodes 1.
[0346] Each lens 4, which is spaced from the top portion of the
light-emitting diode 1 to be opposed thereto, has a translucent
portion 41 having a hemispheric recess used for diverging light
emitted by the light-emitting diode 1 in all directions, and three
positioning protrusions 42 that protrude from the surface of the
translucent portion 41 opposed to the one surface 2a toward the
light-emitting diode substrate 2, so as to determine the position
of the translucent portion 41 relative to the light-emitting diode
substrate 2, with the tip of each positioning projection 42 being
attached to the one surface 2a with an adhesive agent.
[0347] The positioning projections 42 are used for placing the
translucent portion 41 on an upper side from the reflection sheet
5, that is, for placing the reflection sheet 5 on the
light-emitting diode substrate 2 side rather than on the
translucent portion 41 side, and the distance between the
translucent portion 41 and the light-emitting diode substrate 2 is
consequently made slightly longer than the thickness of the
reflection sheet 5 such a manner that a slight space is generated
between the lower surface of the translucent portion 41 and the one
surface of the light-emitting diode substrate 2 so that, even when
the reflection sheet 5 is thermally expanded by heat generated upon
light emission of the light-emitting diode 1, the expansion of the
reflection sheet 5 due to this thermal expansion is permitted so as
not to cause wrinkles on the reflection sheet 5.
[0348] The support body 6 is formed by processing a metal plate,
and has a flat plate portion 61 having substantially a rectangular
shape and a frame portion 62 that is connected to the peripheral
edge of the plate portion 61, and on one surface 6a of the plate
portion 61, the light-emitting diode substrates 2 are housed to be
supported thereon side by side in the length direction, as well as
in the width direction.
[0349] Onto one of the sides in the length direction on the other
surface of the plate portion 61, a power supply circuit board to be
connected to the second connecting portion 22 of the light-emitting
diode substrate 2 by a second connector is attached, and onto the
other side in the length direction, a control circuit board, which
carries out driving and controlling operations on the display unit,
is attached. Moreover, a signal processing circuit board, which
processes image signals to be displayed on the display surface of
the display unit, is attached to the center portion in the length
direction of the other surface of the plate portion 61.
[0350] In the light source device having the above-mentioned
structure, the support body 6 is mounted on a work bench with its
open side facing up, and sets of two light-emitting diode
substrates 2 that are adjacent to each other in the line direction,
are arranged in a plurality of lines, on the one surface 6a of the
plate portion 61 in the support body 6, with the connector 3 being
connected to the connecting portions 21, 21 formed on the adjacent
end portions of adjacent light-emitting diode substrates 2 on the
respective lines, and reflection sheets 5 are mounted on the
respective surfaces of the light-emitting diode substrates 2 on the
respective lines so as to be opposed thereto. The biasing portion
53 between the slits 52, 52 of the reflection sheet 5 is opposed to
the other surface of the connector 3 so as to cover the connector 3
so that the lens 4 is fitted to each of the through holes 51 of the
reflection sheet 5.
[0351] In this case, on each of the adjacent light-emitting diode
substrates 2 on the respective lines, the connecting portions 21
and 22 are formed, with the connector 3 connected to the connecting
portion 21 being overlapped with the one surface 2a, and since the
connector 3 protrudes from the one surface 2a, the bias portion 53
of the reflection sheet 5, opposed to one of the surfaces of the
connector 3, that is, in other words, the portion covering the
connector 3, is gradually biased in the thickness direction
starting from the non-slit portions 52c, 52c, the non-slit portions
54c, 54c and the non-slit portions 55c, 55c, serving as starting
points. In this manner, since portions of the reflection sheet 5
opposed to the connector 3 are gradually biased by the slits 52,
52, the second slits 54, 54 and the third slits 55, 55, it is
possible to enhance the light reflectance of light emitted from the
light-emitting diode 1 and reflected in a direction orthogonal to
the sheet surface, and consequently to uniform its luminance.
[0352] FIG. 52 is a cross-sectional view that illustrates a
structure of a display device provided with a light source device
in accordance with the present invention. This display device has a
display unit 70 (A) having a display surface for use in displaying
a television image thereon on its front side, a light source device
A (B) placed on the rear side of the display unit 70, and a cabinet
71 (D) that conceals the peripheral portion of the display unit 70
and the rear side of the light source device A.
[0353] The display unit 70 has a display panel 72 (A1) having a
display surface and an optical sheet 73(C) that is placed on the
rear side of the display panel 72. The peripheral edge portion of
the display panel 72 is sandwiched by a front-holding frame 74 (A2)
and a rear-holding frame 75 (A3) in a front to rear direction to be
held therein so that a panel module is formed, with the
rear-holding frame 75 being attached to the peripheral edge portion
of the support body 6.
[0354] The optical sheet 73 is a laminated sheet formed by stacking
a diffusion plate having a comparatively high thickness that
diffuses light emitted by the light-emitting diode 1 as a light
source, and synthesized resin sheets having comparatively low
thicknesses, such as a reflective polarizing plate, a prism sheet
and a diffusion sheet.
[0355] The support body 6 is provided with a plate portion 61 and a
frame portion 62 that is connected with the peripheral edge of the
plate portion 61, and supports the peripheral edge portion of the
diffusion plate on the frame portion 62.
[0356] The cabinet 71 is provided with a cabinet front divided unit
71a (D1) that conceals the peripheral edge portion on the front
side of the display unit 70, and a cabinet rear divided unit 71b
(D2) having a deep dish shape so as to conceal the peripheral edge
portion and the rear side of the light source device A, and is
attached to the frame portion 62 of the support member 6 with male
screws.
Embodiment 2-2
[0357] FIG. 53 is an enlarged plan view that illustrates another
structure of the slit portions of a reflection sheet that is
installed in the light source device. In this light source device,
instead of forming the two slits 52, 52 of the reflection sheet 5
into a substantially U-letter shape, slits 56, 56 having a
substantially L-letter shape by long sides 56a, 56a that are spaced
from each other in directions along the sheet surface and two short
sides 56b, 56b each of which is directed from one end of each of
the long sides 56a, 56a toward the side that makes the spaced
distance shorter, and the slits 56, 56 are placed to be opposed to
each other, with the respective long sides 56a, 56a and the
respective short sides 56b, 56b being mutually opposed to each
other so as to form a substantially square shape. The slits 56, 56
are arranged such that non-slit portions 56c, 56c between the
respective ends are connected to a bias portion 53 between the
slits 56, 56 so that the bias portion 53 can be biased in a
thickness direction from the non-slit portions 56c, 56c serving as
starting points.
[0358] Between the two slits, two slits 57, 57, each having a
substantially L-letter shape, which are placed so as to be opposed
to each other, with the respective long sides 57a, 57a and the
respective short sides 57b, 57b being mutually made to form a
substantially square shape, are formed with an opening, with the
respective corner portions being opposed to the non-slit portions
56c, 56c between the respective two ends of the slits 56, 56. The
slits 57, 57 are arranged such that non-slit portions 57c, 57c
between the respective two ends are connected to a center portion
between the slits 56, 56 so that the bias portion 53 can be biased
in a thickness direction from the non-slit portions 57c, 57c
serving as starting points.
[0359] In the present embodiment, the bias portion 53 of the
reflection sheet 5, opposed to the connector 3, is gradually biased
in a thickness direction from the non-slit portions 56c, 56c and
the non-slit portions 57c, 57c serving as starting points. Since
portions of the reflection sheet 5, opposed to the connector 3, are
gradually biased by the slits 56, 56 and the slits 57, 57, it is
possible to enhance the light reflectance of light emitted from the
light-emitting diode 1 and reflected in a direction orthogonal to
the sheet surface, and consequently to uniform its luminance.
[0360] Since the other structures and functions are the same as
those of the embodiment 2-1, the same parts are indicated by the
same reference numerals, and the detailed description thereof and
the explanation of the functions and effects will be omitted.
Embodiment 2-3
[0361] FIG. 54 is a plan view that illustrates another structure of
the slit portions of a reflection sheet that is installed in the
light source device. In this light source device, instead of
forming the two slits 52, 52 of the reflection sheet 5 into a
substantially U-letter shape, or instead of forming the slits 56,
56 thereof into a substantially L-letter shape, paired slits 58, 58
(B56), which are spaced from each other in the direction along the
sheet surface, and opposed to each other in parallel, are prepared,
and the paired slits 58, 58 are separated from each other in the
parallel arranging direction of light-emitting diode substrates 2
that are parallel arranged into a plurality of lines (in a
direction orthogonal to the line, or an intersecting direction) so
that the opposing direction is alternately made different. In other
words, portions opposed to the connector 3 to be connected to the
light-emitting diode substrate 2 on one line are separated from
each other in the line direction so as to be opposed to each other,
while portions opposed to the connector 3 to be connected to the
light-emitting diode substrate 2 on the adjacent line are separated
from each other in the direction orthogonal to the line direction,
so that the paired slits 58, 58 that are opposed to each other in
these different directions are alternately placed with the parallel
arranged interval of the plurality of lines. In the case when the
opposing direction of the paired slits 58, 58 that are separated
from each other in the parallel arranging direction of the
light-emitting diode substrates 2 is the same, the paired slits 58,
58 are arranged in parallel with each other such that the non-slit
portions 58a, 58a between the slits 58, 58 are set in the same
direction, with the result that the dispersing property of
reflected light at the bias portion is lowered; however, in the
case when the paired slits 58, 58 are alternately placed with the
parallel arranged interval of the plurality of lines, the
dispersing property of reflected light at the bias portion can be
improved so that the luminance characteristic can be appropriately
maintained.
[0362] The two slits 58, 58 that are opposed in parallel with each
other are biased in the thickness direction from the non-slit
portions 58a, 58a between the two ends of the slits 58, 58 serving
as starting points. The adjacent two slits 58, 58 have their
non-slit portions 58a, 58a arranged in the orthogonal
direction.
[0363] In this embodiment, even when the number of parallel
arranged light-emitting diode substrates 2 parallel placed into a
plurality of lines is comparatively high, that is, even when the
number of parallel arranged connectors 3 is high, the degree of
slant due to the biased portion opposed to each connector 3 can be
made smaller so that it becomes possible to enhance the light
reflective property in a direction orthogonal to the sheet surface,
and consequently to maintain the luminance property
appropriately.
[0364] Since the other structures and functions are the same as
those of the embodiment 2-1, the same parts are indicated by the
same reference numerals, and the detailed description thereof and
the explanation of the functions and effects will be omitted.
Embodiment 2-4
[0365] FIG. 55 is a plan view that illustrates another structure of
the slit portions of a reflection sheet that is installed in the
light source device. In this light source device, instead of
forming bias portions 53 by using slits that are spaced from each
other and opposed to each other, each bias portion 53 is formed by
using a slit 59 having a spiral shape.
[0366] The slit 59 has a spiral shape from its starting point to
its end point, and is designed so that, when made in contact with
the connector 3, the gap between the two ends of the slit 59 is
gradually biased as a whole.
[0367] Since the other structures and functions are the same as
those of embodiment 2-1, the same parts are indicated by the same
reference numerals, and the detailed description thereof and the
explanation of the functions and effects will be omitted.
Embodiment 2-5
[0368] FIG. 56 is a plan view that illustrates another structure of
the slit portions of a reflection sheet that is installed in the
light source device. In this light source device, instead of
forming the bias portion 53 by using a slit 59 having a round
spiral shape, each bias portion 53 is formed by using a slit 50
having a substantially square spiral shape.
[0369] The slit 50 has a substantially square spiral shape from its
starting point to its end point, and is designed so that, when made
in contact with the connector 3, the gap between the two ends of
the slit 50 is gradually biased as a whole.
[0370] In this embodiment, even when the number of parallel
arranged light-emitting diode substrates 2 parallel placed into a
plurality of lines is comparatively high, that is, even when the
number of parallel arranged connectors 3 is high, the spaced
distance between the slits 50 can be ensured so that the number of
arranged slits 50 is increased.
[0371] Since the other structures and functions are the same as
those of the embodiment 2-1, the same parts are indicated by the
same reference numerals, and the detailed description thereof and
the explanation of the functions and effects will be omitted.
Embodiment 2-6
[0372] FIG. 57 is a plan view that illustrates another structure of
the slit portions of a reflection sheet that is installed in the
light source device. In this light source device, instead of
providing the structure in which the two slits 52, 52, each having
a substantially U-letter shape, are opposed to each other, with the
two ends thereof being close to each other, one of two slits 52,
52, each having a substantially U-letter shape, is biased in a
direction intersecting the opposing direction of the slits 52, 52,
so that short sides 52b, 52b of the two ends of the respective
slits 52, 52 are separated in a direction intersecting the opposing
direction so as to be opposed to each other.
[0373] The short sides 52b, 52b of the two ends of the two slits
52, 52 are opposed to the two corner portions of the respective
slits 52, 52, with non-slit portions 52c, 52c between the two ends
of the two slits 52, 52 and the two corner portions of the slits
52, 52 are connected to a bias portion 53 between the slits 52, 52
so that the bias portion 53 can be biased in the thickness
direction from the non-slit portions 52c, 52c serving as starting
points.
[0374] In this embodiment, since the bias portion 53 is located
between the slits 52, 52 each having a substantially U-letter shape
so that the distance between the non-slit portions 52c, 52c can be
made comparatively longer, the bias portion 53 of the reflection
sheet 5 that is opposed to the connector 3 can be gradually biased
in the thickness direction from the non-slit portions 52c, 52c
serving as starting points. In this manner, since the portion
opposed to the connector 3 of the reflection sheet 5 is gradually
biased along a comparatively long distance between the non-slit
portions 52c, 52c, it becomes possible to enhance the light
reflective property of light that is emitted by the light-emitting
diode 1 and reflected in a direction orthogonal to the sheet
surface, and consequently to uniform the luminance.
[0375] Since the other structures and functions are the same as
those of the embodiment 2-1, the same parts are indicated by the
same reference numerals, and the detailed description thereof and
the explanation of the functions and effects will be omitted.
[0376] In the above-mentioned embodiments 2-1 to 2-6, as shown in
FIGS. 45 and 46, bias portions 53, prepared by the slits 52 or the
like, are placed on all the portions in association with the number
of parallel arranged light-emitting diode substrates 2 that are
parallel arranged into a plurality of lines; however, in addition
to this structure, the bias portion 53 may be arranged as shown in
FIGS. 58 and 60, or as shown in FIG. 59, another structure may be
proposed in which in place of the bias portions 53, through holes
may be formed by omitting the bias portions 53. FIGS. 58 to 60 are
perspective views that show another structure of a reflection
sheet. In FIG. 58, bias portions 53, prepared by the slits 52 or
the like, are placed only on portions corresponding to the
light-emitting diode substrates 2 on the two ends in the parallel
arranging direction of the light-emitting diode substrates 2 that
are parallel arranged into a plurality of lines. In FIG. 59,
through holes 59 each of which is larger than the connector are
placed only on portions corresponding to the light-emitting diode
substrates 2 on the two ends in the parallel arranging direction of
the light-emitting diode substrates 2 that are parallel arranged
into a plurality of lines. In FIG. 60, through holes 59 each of
which is larger than the connector are placed on portions
corresponding to the light-emitting diode substrates 2 on the two
ends in the parallel arranging direction of the light-emitting
diode substrates 2 that are parallel arranged into a plurality of
lines, and bias portions 53, prepared by the slits 52 or the like,
are placed on portions corresponding to the light-emitting diode
substrates 2 that are adjacent to the light-emitting diode
substrates 2 on the two ends in the parallel arranging direction.
In the embodiments of FIGS. 58 and 60, since the connector is
disposed within the bias portion 53, the reflection sheet 5 can be
properly positioned relative to the support body 6 so that it
becomes possible to prevent the reflection sheet 5 from being
deviated. In the embodiment of FIG. 59, since the connector is
disposed within the through hole 59, the reflection sheet 5 can be
properly positioned relative to the support body 6 so that it
becomes possible to prevent the reflection sheet 5 from being
deviated.
Embodiment 3-1
[0377] FIG. 61 is a longitudinal cross-sectional view that
schematically illustrates a display device.
[0378] In this figure, reference numeral 1 represents a display
panel (A1) that is provided with liquid crystal and has a
rectangular shape, and the display panel 1 is designed so that by
controlling a voltage to be applied to the liquid crystal, the
transmittance of light is adjusted to display an image. The display
panel 1 is supported by a front-holding frame 2 (A2) and a
rear-holding frame 3 (A3) at its peripheral edge portion, and
housed in a front cabinet 4 (D1) having a rectangular frame shape.
The front cabinet 4 is disposed on the periphery of the
front-holding frame 2 and the rear-holding frame 3. The front
cabinet 4 is provided with an opening having a rectangular shape,
and the dimension of the opening corresponds to the dimension of
the display panel 1. On the rear side of the display panel 1, a
plurality of optical sheets 5(C) that converge light of an LED 9
(light-emitting element) to be described later toward the display
panel 1 are installed.
[0379] On the rear side of the optical sheets 5(C), a diffusion
plate 6 that uniformly diffuses light of the LED 9 (B1) is
installed. The diffusion plate 6 is supported by an edge portion of
a support plate 7 (B6) having a deep dish shape. A plurality of LED
substrates 8 (B3) are arranged in parallel with one another on the
front surface of the support plate 7 (B6), and on the rear surface
of each of the LED substrates 8, a film-shaped heat radiating
pattern (not shown), made of a thermal conductive material, such as
a metal material, is formed so that heat generated in the LED
substrate 8 due to lighting-on of the LED 9 is radiated from the
heat radiating pattern to the support plate 7 so that the heat
radiating property of the LED substrates 8 can be improved.
[0380] On the front surface of each of the LED substrates 8, a
plurality of LEDs 9, 9, . . . , 9 (B1) are assembled, and lenses
10, 10, . . . 10 (B2) for use in diffusing light are respectively
arranged on the front sides of the respective LEDs 9, 9, . . . , 9.
Three protrusions 10a (B22), which protrude toward the LED
substrate 8 side, are disposed side by side in a circumferential
direction on the peripheral edge portion of the lens 10, and the
tip of each protrusion 10a is attached to the front surface of each
LED substrate 8 by an adhesive agent.
[0381] On the right and left sides of the support plate 7,
supporting bases (not shown) for supporting a reflection sheet 11
(B5) having a deep dish shape are installed separately. A plurality
of sheet holes 11a (B53) to which the lenses 10 are inserted are
formed on the bottom surface of the reflection sheet 11. Each of
the lenses 10 is allowed to protrude to the front side through the
sheet hold 11a.
[0382] A rear cabinet 12 (D2) having a deep dish shape is installed
on the rear side of the support plate 7. The longitudinal and
lateral dimensions of the rear cabinet 12 are substantially the
same as the longitudinal and lateral dimensions of the front
cabinet 4, and the edge portion of the rear cabinet 12 and the edge
portion of the front cabinet 4 are opposed to each other. An
engaging convex portion and an engaging recess, not shown, are
respectively formed on the edge portions of the front cabinet 4 and
the rear cabinet 12 so that by engaging the engaging convex portion
and the engaging recess with each other, the front cabinet 4 is
secured to the rear cabinet 12. Additionally, a plurality of
circuit boards (not shown), such as a control circuit board for use
in driving and controlling the display panel 1 and a signal
processing circuit board for use in processing an image signal for
displaying an image on the display surface of the display panel 1,
are housed in the rear cabinet 12, and based upon output signals
from the circuit boards, the display panel 1 can be driven.
[0383] FIG. 62 is a front view that schematically illustrates the
LEDs 9 and the LED substrates 8 on which reflection sheets are
formed, and FIG. 63 is a cross-sectional view taken along N of FIG.
62, which schematically illustrates rivets.
[0384] On each LED substrate 8 (B3), a plurality of substrate holes
8a (B33, B34) are formed side by side with equal intervals in the
longitudinal direction of the LED substrate 8. On the support plate
7 (B6), as shown in FIG. 63, a plurality of through holes 7a (B64)
are formed at positions corresponding to the substrate holes 8a.
The diameter of each through hole 7a is substantially equal to the
diameter of each substrate hole 8a. On the reflection sheet 11
(B5), insertion holes 11b (B54) are formed at positions
corresponding to the substrate holes 8a, and each insertion hold
11b has a diameter larger than that of the substrate hole 8a.
[0385] As shown in FIG. 62, rivets 20 (B7) made from a synthetic
resin, positioning rivets 30 and supporting rivets 40 (B8) are
respectively attached between the respective lenses.
[0386] For use in the substrate holes 8a and through holes 7a, for
example, metal rivets may be used instead of the rivets 20 made
from synthetic resin; however, rivets 20 made from a carbon
material may be inserted therein so that the LED substrates 8 may
be secured onto the support plate 7 by the rivets 20. Each of the
rivets 20 made from synthetic resin is composed of a reception
rivet 22 (B71) and an insertion rivet 21 (B72).
[0387] The reception rivet 22 is provided with an engaging stop
portion 22a (B71a) having a ring shape whose diameter is larger
than the diameter of each substrate hole 8a, and the outer
circumferential portion of the engaging stop portion 22a is engaged
with the edge of the substrate hole 8a on the inside of the
insertion hold 11b located outside of the substrate hole 8a, and
stopped therein. A plurality of elastic portions 22b are arranged
side by side in the circumferential direction on the inner
circumferential portion of the engaging stop portion 22a. The
elastic portions 22b are allowed to protrude in the axis direction
of the engaging stop portion 22a so as to be inserted through the
substrate hole 8a and the through hole 7a. The dimension in the
axis direction of each elastic member 22b is made larger than the
dimension in the axis direction of the substrate hole 8a and the
through hole 7a, and the protruding tip of each of the elastic
portions 22b is extended in the axis direction from the through
hole 7a.
[0388] The protruding tip of each of the elastic portions 22b is
provided with a contact portion 22c that is extended inward in the
radial direction of the engaging stop portion 22a so as to be
integrally formed together with each elastic portion 22b, and a gap
(B71b) is formed between the contact portions 22c, 22c.
[0389] A leg portion 21b to be described later is made in contact
with the inside of the contact portion 22c, and the elastic portion
22b is consequently curved outward by the contact with the leg
portion 21b so that the elastic portion 22b is made in contact with
the edge portion of the through hole 7a. For this reason, the LED
substrate 8 and the support plate 7 are sandwiched between the
engaging stop portion 22a and the elastic portion 22b from the
front and rear sides.
[0390] The insertion rivet 21 is provided with a head portion 21a
(B72a) having a diameter larger than that of the insertion hold
11b, and in the center of the head portion 21a, a column shaped leg
portion 21b, which makes right angles with the head portion 21a, is
formed. The tapered portion 21ba is formed on the tip of the leg
portion 21b so that the diameter of the leg portion 21b becomes
gradually smaller toward the tip. The diameter of the leg portion
21b near the head portion 21a has substantially the same size as
the inner diameter of the engaging stop portion 22a so as to be
greater than the dimension between the contact portions 22c in the
case when no leg portion 21b is inserted therein. Additionally, the
edge portion of the head portion 21a is extended toward the leg
portion 21b side, and the extending width of the edge portion of
the head portion 21a becomes smaller than the dimension in the axis
direction of the engaging stop portion 22a, that is, the thickness
dimension of the engaging stop portion 22a.
[0391] The leg portion 21b of the insertion rivet 21 is inserted
into the engaging stop portion 22a so that the tip portion of the
leg portion 21b is inserted into a gap between the contact portions
22c. Since the tapered portion 21ba is formed on the tip portion of
the leg portion 21b, the gap is pushed to be widened by the
insertion of the leg portion 21b. The elastic portion 22b is curved
outward to be made in contact with the edge portion of the through
hole 7a.
[0392] The head portion 21a is made in contact with the engaging
stop portion 22a, and the head portion 21a is not made in contact
with the reflection sheet 11. A slight gap is prepared between the
edge portion of the head portion 21a extended toward the leg
portion 21b side and the reflection sheet 11 so that, even when the
reflection sheet 11 is thermally expanded by light emitted by the
LED 9, the extension and contraction of the reflection sheet 11 due
to the thermal expansion is permitted so as not to cause wrinkles
on the reflection sheet 11. The reflection sheet 11 is held by the
edge portion of the head portion 21a so that the reflection sheet
11 is prevented from being biased in the thickness direction. The
support plate 7 and the LED substrate 8 are sandwiched by the
elastic portion 22b and the engaging stop portion 22a with an
appropriate pressure so that the LED substrate 8 and the support
plate 7 are tightly made in contact with each other.
[0393] The following description will discuss the positioning rivet
30. FIG. 64 is a cross-sectional view taken along line II-II of
FIG. 62 that schematically illustrates the positioning rivet 30.
Positioning holes 7b and 8b (B60, B35) are respectively formed at
corresponding positions of the support plates 7 and the LED
substrates 8, and the respective positioning holes are respectively
adjacent to the through holes 7a and the substrate holes 8a. The
respective positioning holes are coaxially disposed with the
support plates 7 and the LED substrates 8.
[0394] As shown in FIG. 62, insertion holes 11c (B57), each having
a keyhole shape, with one portion of its circle extended outward,
are formed on the reflection sheet 11, and the through hole 7a and
the substrate hole 8a are located within the circle of the
insertion hold 11c. The positioning holes 7b and 8b are located at
the extended portion of the insertion hold 11c. The width dimension
of the extended portion of the insertion hold 11c is made slightly
larger than each of the positioning holes 7b and 8b. The
positioning rivets 30 (B7, B73) are inserted through the through
holes 7a and substrate holes 8a, as well as through the positioning
holes 7b and 8b.
[0395] Each of the positioning rivets 30 is provided with a
reception rivet 22 (B71) and an insertion rivet 31 (B72).
Additionally, the reception rivet 22 of the positioning rivet 30
has the same structure as that of the reception rivet of the
aforementioned rivet 21, and is indicated by the same reference
numeral, and the detailed description thereof will be omitted.
[0396] The insertion rivet 31 is provided with a head portion 31a
(B72a) having a diameter larger than that of the insertion hold
11c, and the head portion 31a has an elliptical shape. A column
shaped leg portion 31b, which makes right angles with the head
portion 31a, is formed on one end of the head portion 31a. A
tapered portion 31ba is formed on the tip of the leg portion 31b so
that the diameter of the leg portion 31b becomes gradually smaller
toward the tip. The diameter of the leg portion 31b near the head
portion 31a has substantially the same size as the inner diameter
of the engaging stop portion 22a so as to be greater than the
dimension between the contact portions 22c in the case when no leg
portion 31b is inserted therein. A column shaped positioning
portion 31c (B73), which makes right angles with the head portion
31a, is formed on the other end of the head portion 31a. The
diameter of the positioning portion 31c is slightly smaller than
the diameter of the positioning holes 7b and 8b. The dimension
between the positioning portion 31c and the leg portion 31b is
substantially the same as the dimension between the through hole 7a
as well as the substrate hole 8a and the positioning holes 7b, 8b.
Additionally, the edge portion of the head portion 31a is extended
toward the leg portion 31b side, and the extending width of the
edge portion of the head portion 31a becomes smaller than the
dimension in the axis direction of the engaging stop portion 22a,
that is, the thickness dimension of the engaging stop portion
22a.
[0397] The positioning portion 31c is inserted into the positioning
hole 7b or 8b, and in the case when the reflection sheet is shifted
in the width direction of the extended portion of the insertion
hold 11c, since the positioning portion 31c and the edge of the
extended portion of the insertion hold 11c are made in contact with
each other, the reflection sheet is properly positioned.
[0398] The leg portion 31b of the insertion rivet 31 is inserted
into the engaging stop portion 22a, and the tip portion of the leg
portion 31b is inserted into a gap between the contact portions
22c. A tapered portion 31ba is formed on the tip of the leg portion
31b so that the gap is pushed and widened by the insertion of the
leg portion 31b. The elastic portion 22b is curved outward to be
made in contact with the edge portion of the through hole 7a.
[0399] The head portion 31a is made in contact with the engaging
stop portion 22a, and the head portion 31a is not made in contact
with the reflection sheet 11, with a slight gap being prepared
between the head portion 31a and the reflection sheet 11 so that,
even when the reflection sheet 11 is thermally expanded by light
emitted by the LED 9, the extension and contraction of the
reflection sheet 11 due to the thermal expansion is permitted so as
not to cause wrinkles on the reflection sheet 11. The reflection
sheet 11 is pressed by the edge portion of the head portion 31a.
The support plate 7 and the LED substrate 8 are sandwiched by the
elastic portion 22b and the engaging stop portion 22a with an
appropriate pressure so that the LED substrate 8 and the support
plate 7 are tightly made in contact with each other.
[0400] The following description will discuss the supporting rivet
40. FIG. 65 is a cross-sectional view taken along line III-III of
FIG. 62 that schematically illustrates the supporting rivet 40.
[0401] The supporting rivet 40 (B8) is provided with a reception
rivet 22 (B81) and an insertion rivet 41 (B82). Additionally, the
reception rivet 22 of the supporting rivet 40 has the same
structure as that of the rivet 21 or the reception rivet of the
positioning rivet so that it is indicated by the same reference
numeral and the detailed description thereof will be omitted. As
shown in FIG. 62, insertion holes 11d (B55) are formed on the
reflection sheet 11 at positions corresponding the substrate holes
8a (B65), and each insertion hold 11d has a diameter larger than
that of the substrate holes 8a (B65).
[0402] The insertion rivet 41 is provided with a head portion 41a
(B82a) having a diameter larger than that of the insertion hold
11d, and in the center of the head portion 41a, a column shaped leg
portion 41b, which makes right angles with the head portion 41a, is
formed. A tapered portion 41ba is formed on the tip of the leg
portion 41b so that the diameter of the leg portion 41b becomes
gradually smaller toward the tip. The diameter of the leg portion
41b near the head portion 41a has substantially the same size as
the inner diameter of the engaging stop portion 22a so as to be
greater than the dimension between the contact portions 22c in the
case when no leg portion 41b is inserted therein. Additionally, the
edge portion of the head portion 41a is extended toward the leg
portion 41b side, and the extending width of the edge portion of
the head portion 41a becomes smaller than the dimension in the axis
direction of the engaging stop portion 22a, that is, the thickness
dimension of the engaging stop portion 22a.
[0403] From the center of the head portion 41a on the side opposite
to the engaging stop portion 22a, a cone-shaped support portion 41c
(B83) having its tip formed into a curved surface is extended in
the axis direction. The support portion 41c supports the diffusion
plate 6.
[0404] The leg portion 41b of the insertion rivet 41 is inserted
into the engaging stop portion 22a so that the tip portion of the
leg portion 41b is inserted into a gap between the contact portions
22c. Since the tapered portion 41ba is formed on the tip portion of
the leg portion 41b, the gap is gradually pushed to be widened by
the insertion of the leg portion 41b. The elastic portion 22b is
curved outward to be made in contact with the edge portion of the
through hole 7a.
[0405] The head portion 41a is made in contact with the engaging
stop portion 22a, and the head portion 41a is not made in contact
with the reflection sheet 11, with a slight gap being prepared
between the head portion 41a and the reflection sheet 11 so that,
even when the reflection sheet 11 is thermally expanded by light
emitted by the LED 9, the extension and contraction of the
reflection sheet 11 due to the thermal expansion is permitted so as
not to cause wrinkles on the reflection sheet 11. The reflection
sheet 11 is pressed by the edge portion of the head portion 41a.
The support plate 7 and the LED substrate 8 are sandwiched by the
elastic portion 22b and the engaging stop portion 22a with an
appropriate pressure so that the LED substrate 8 and the support
plate 7 are tightly made in contact with each other.
[0406] In the display device relating to the embodiment 3-1, the
reflection sheet 11 is disposed between the head portions of the
rivets 20, the positioning rivets 30, as well as the supporting
rivets 40, and one surface of the LED substrate 8, and since a gap
is formed between the head portions and the reflection sheet 11,
even upon occurrence of an abrupt thermal change, the reflection
sheet 11 is allowed to expand or contract between the head portions
and the reflection sheet 11 so that it is possible to prevent
wrinkles from occurring on the reflection sheet 11.
[0407] Moreover, by making the head portions of the rivets 20, the
positioning rivets 30 and the supporting rivets 40 in contact with
the engaging stop portion 22a, the reflection sheet 11 is held,
with a slight gap being formed between the edges of the head
portions and the reflection sheet 11, so that it is possible to
prevent wrinkles from occurring on the reflection sheet 11.
Furthermore, in a state where the engaging stop portion 22a is
engaged with the edge portion of the substrate hole 8a to be
stopped thereon, the elastic portion 22b is inserted into the
substrate hole 8a and the through hole 7a, and the leg portion of
the rivet 20, the positioning rivet 30 or the supporting rivet 40
is inserted into the engaging stop portion 22a to be made in
contact with the contact portion 22c. At this time, the elastic
portion 22b is curved outward in the radial direction by elastic
deformation, and since the curved elastic portion 22b is made in
contact with the edge portion of the through hole 7a, the LED
substrate 8 and the support plate 7 are sandwiched and held by the
engaging stop portion 22a and the elastic portion 22b.
[0408] By inserting the positioning portion 31c into the
positioning hole 7b or 8b, the reflection sheet 11 is made in
contact with the positioning portion 31c even when the reflection
sheet 11 is pivoted, so that the pivoting movement of the
reflection sheet 11 can be disturbed. Thus, it becomes possible to
positively carry out the positioning process of the reflection
sheet 11.
[0409] Since the supporting rivets 40 support the diffusion plate 6
by the support portion 41c, as well as supporting the reflection
sheet 11, it is possible to prevent the diffusion plate 6 from
being curved, and also to reduce the number of parts.
[0410] In the display device in accordance with the embodiment 3-1,
positioning holes 7b and 8b are respectively formed on the support
plate 7 and the LED substrate 8; however, only the positioning hole
8b may be formed on the LED substrate 8. In this case, it is
needless to say that the dimension in the axis direction of the
positioning portion 31c is made to correspond to the dimension in
the axis direction of the positioning hole 8b. Moreover, the LEDs 9
are used as the light-emitting elements of the display device
relating to the embodiments; however, LDs (Laser Diodes), etc. may
be used. Moreover, the support portion 41c may be further formed on
each of the head portions 31a and 41a of the insertion rivets 21
and 31.
Embodiment 3-2
[0411] FIGS. 66A and 66B are expanded cross-sectional views that
show another structure of a portion used in securing the LED
substrate 8 onto the support plate 7. FIG. 66A shows a structure in
which in place of the rivet 20 (B7) having the reception rivet 22
(B71) and the insertion rivet 21 (B72), a single rivet 50 (B7) is
used in securing the LED substrate 8 (B3) onto the support plate 7
(B6), and FIG. 66B shows a structure in which in place of rivets,
the LED substrate 8 is secured onto the support plate 7 by using
male screws 60 (B7).
[0412] The rivet 50 (B7) of FIG. 66A is provided with a head
portion 50a (B72a) having a diameter larger than the insertion hold
11b, a step portion 50b that is connected to the center portion of
the head portion 50a, and has a diameter larger than the substrate
hole 8a (B33a, B34a), and a plurality of leg portions 50c that are
connected to the center portion of the step portion 50b, and
inserted into through holes 7a (B64), and a claw portion 50d to be
engaged with a hole edge of the through hole 7a is formed on the
tip of the leg portion 50c.
[0413] In this structure, by inserting the leg portion 50c through
the substrate hole 8a and the through hole 7a from the insertion
hold 11b, the claw portion 50d is engaged with the hole edge of the
through hole 7a to stop thereon, with the step portion 50b being
made in contact with the hole edge of the substrate hole 8a, so
that the LED substrate 8 can be secured onto the support plate 7. A
slight gap is prepared between the edge portion of the head portion
50a and the reflection sheet 11 so that, even when the reflection
sheet 11 is thermally expanded by light emitted from the LED 9, the
extension and contraction of the reflection sheet 11 due to this
thermal expansion is permitted to prevent wrinkles from occurring
on the reflection sheet 11.
[0414] The male screw 60 (B7) of FIG. 66B is provided with a head
portion 60a (B72a) having a diameter larger than the insertion hold
11b, a step portion 60b that is connected to the center portion of
the head portion 60a, and has a diameter larger than the substrate
hole 8a (B33a, B34a), a step portion 60c that is connected to the
center portion of the step portion 60b, and has a diameter larger
than the through hole 7a (B64), and a threaded shaft portion 60d
that is connected to the center portion of the step portion 60c,
and inserted into the through hole 7a.
[0415] In this structure, by inserting the threaded shaft portion
60d of the male screw 60 through the substrate hole 8a from the
insertion hole 11b, with the threaded shaft portion 60d being
screwed into the through hole 7a, the step portion 60c is made in
contact with the hole edge of the through hole 7a so that the male
screw 60 is secured into the support plate 7, and the step portion
60b is made in contact with the hole edge of the substrate hole 8a
so that the LED substrate 8 can be secured onto the support plate
7. A slight gap is prepared between the edge portion of the head
portion 60a and the reflection sheet 11 so that, even when the
reflection sheet 11 is thermally expanded by light emitted from the
LED 9, the extension and contraction of the reflection sheet 11 due
to this thermal expansion is permitted to prevent wrinkles from
occurring on the reflection sheet 11.
Embodiment 4
[0416] FIG. 67 is a cross-sectional view that illustrates a main
portion of a structure of a light source device in accordance with
the present invention, FIG. 68 is a plan view that illustrates one
portion of the light source device, FIG. 69 is a plan view that
illustrates the light source device one portion of which is
disassembled, FIG. 70 is a plan view that illustrates partial
members of the light source device, FIGS. 71 and 72 are enlarged
plan views that illustrate one portion of the light source device,
FIGS. 73 and 74 are perspective views that show a structure of a
light-emitting diode to which lenses are attached, and FIG. 75 is a
cross-sectional view that illustrates one example of fixtures.
[0417] The light source device having one surface 2a on which a
plurality of light-emitting diodes 1 (B1) are assembled is provided
with a plurality of light-emitting diode substrates 2 (B3) that are
spaced from one another, and arranged in parallel with one another,
a plurality of lenses 3 (B2) that are attached to the one surface
2a of the light-emitting diode substrate 2 so as to be opposed to
top portions of the respective light-emitting diodes 1, and used
for diffusing light emitted by the light-emitting diodes 1, and
through holes 41 (B53) in which the lenses 3 are arranged, and also
has a reflection sheet 4 (B5) that is mounted on the one surface 2a
of the light-emitting diode substrate 2, and reflects light emitted
by the light-emitting diodes 1, a plurality of connectors 5 (B4)
that connect the adjacent light-emitting diode substrates 2 with
each other, and a support body 6 (B6) that is located on another
surface 2b of the light-emitting diode substrate 2, and supports
the plural light-emitting diode substrates 2.
[0418] The light-emitting diode substrate 2 (B3) has a circuit unit
on the one surface 2a, and is formed into a rectangular shape
(stripe shape) with its length having a ratio higher than that of
its width. A plurality of the light-emitting diodes 1 are assembled
on the one surface 2a of each of the light-emitting diode
substrates 2, in a separated manner, with substantially the same
interval in the longitudinal direction. The light-emitting diode
substrate 2 is a one-sided substrate, with a conductor unit formed
only on the one surface 2a side. A plurality of the rectangular
light-emitting diode substrates 2 are arranged on one surface 6a of
the support member 6 having a rectangular shape, while being spaced
in the longitudinal direction as well as in the width direction,
with the longitudinal directions thereof being aligned in the same
direction.
[0419] FIG. 69 shows one example in which the light-emitting diode
substrate 2 is placed in the center, with six light-emitting diodes
1 assembled thereon, and light-emitting diode substrates 2, each
having five light-emitting diodes 1 assembled thereon, are disposed
on the two sides thereof, so that three sheets of the
light-emitting diode substrates 2 connected in one line are
prepared, and eight lines of them are arranged in the width
direction with substantially the same interval as the assembled
interval of the light-emitting diodes 1 on the light-emitting diode
substrate 2. The respective light-emitting diode substrates 2,
arranged in a direction orthogonal to a line of the light-emitting
diode substrates 2 arranged into one line, have substantially the
same dimension in the longitudinal direction. Moreover, the
light-emitting diodes 1 on all the light-emitting diode substrates
2 are arranged with substantially the same two-dimensional interval
from one another.
[0420] Connecting portions 21 and 22 (B31, B32) are formed on two
ends in the longitudinal direction of the one surface 2a of each
light-emitting diode substrate 2. In three sheets of the
light-emitting diode substrates 2 aligned into one line, the
connecting portions 21, 21 of the adjacent light-emitting diode
substrates 2 are mutually connected to each other by connectors 5
(B4). Moreover, as will be described later, the connecting portion
22 of the light-emitting diode substrate 2 located on one of the
ends of a line is connected to a power supply circuit board by a
connector (B41), while a short connector is connected to the
connecting portion 22 of the light-emitting diode substrate 2
located on the other end of the line.
[0421] Each of the lenses 3 (B2) is provided with a translucent
portion 31 (B21) that is spaced from a top portion of the
light-emitting diode 1 to be opposed thereto, and has a
hemispherical recess used for diffusing light emitted by the
light-emitting diode 1 in all directions, and three positioning
protrusions 32 (B22) that protrude from the surface of the
translucent portion 31 opposed to the one surface 2a toward the
light-emitting diode substrate 2, so as to determine the position
of the lens 3 relative to the light-emitting diode substrate 2,
with the tip of each positioning projection 32 being attached to
the one surface 2a with an adhesive agent. The translucent portion
31 is formed into a shape that is slightly smaller than the through
hole 41 of the reflection sheet 4.
[0422] The reflection sheet 4 (B5) having a highly reflective
property, which is composed of a sheet of synthetic resin sheet
having a rectangular shape in association with the support member
6, has a structure in which through holes 41 (B53) having a round
shape, with a diameter that is slightly larger than that of the
translucent portion 31, are formed in a diced pattern at positions
corresponding to the respective lenses 3, and second through holes
42 having a rectangular shape, through which the connectors 5 are
inserted, are formed at positions corresponding to the connectors
5.
[0423] Two through holes 2c and 2d (B33, B34) through which rivets
8 (B7) for use in supporting the light-emitting diode substrate 2
on the support body 6 are inserted are formed on one end and the
other end in the longitudinal direction of the rectangular-shaped
light-emitting diode substrate 2. The respective through holes 2c
and 2d are located between the two adjacent lenses 3. The dimension
in the substrate longitudinal direction of one through hole 2c
(B33) of the two through holes 2c, 2d is smaller than the dimension
of the other through hole 2d (B34). More specifically, one of the
through holes 2c is a round hole, and the other through hole 2d has
an elongated round shape that is long in the substrate longitudinal
direction. In the end portions at which the light-emitting diode
substrates 2 aligned into one line are connected to each other, the
respective light-emitting diode substrates 2 are arranged so that
the through hole 2c having a smaller dimension and the through hole
2d having a larger dimension are made adjacent to each other.
[0424] In the eight light-emitting diode substrates 2 that are
adjacent to one after another in a direction orthogonal to the
lines of the light-emitting diode substrates 2, each aligned into
one line, eight insertion holes 2c on one end side are positioned
in a zigzag pattern, while eight insertion holes 2d on the other
end side are also positioned in a zigzag pattern. More
specifically, the insertion holes 2c on the one end side are
alternately located at positions closer to one side of two sets of
lenses 3 located on one end, as well as at positions closer to the
other side, and in the same manner, the insertion holes 2d on the
other end side are alternately located at positions closer to one
side of two sets of lenses 3 located on the other end, as well as
at position closer to the other side thereof so that rivets 8,
which are inserted through the insertion holes 2c and the insertion
holes 2d so as to secure the two ends of the light-emitting diode
substrate 2 onto the support body 6, are arranged in a zigzag
pattern; thus, influences by the rivets 8 to cause a reduction of
luminance are dispersed so that luminance irregularities in
illumination light can be suppressed.
[0425] The support body 6 is formed by processing a metal plate,
and has a flat plate portion 61 (B61) having substantially a
rectangular shape and a frame portion 62 (B62) that is connected to
the peripheral edge of the plate portion 61, and on one surface 6a
of the plate portion 61, the light-emitting diode substrates 2 are
housed to be supported thereon side by side in the length direction
as well as in the width direction. On the plate portion 61 of the
support body 6, through holes 61a (B64) are formed at positions
corresponding to the respective insertion holes 2c and 2d of the
light-emitting diode substrate 2.
[0426] As shown in FIG. 75, each of the rivets 8 (B7) has an outer
diameter g1 capable of being inserted through the insertion holes
2c, 2d and the through hole 61a, a flange portion 81a (B71a) that
is attached to one of the ends and is not capable of being inserted
through the insertion holes 2c and 2d and the through hole 61a, a
cylindrical part 81 (B71) whose inner diameter g3 of the other end
is smaller than the inner diameter g2 of one of the ends, and a
shaft part 82 (B72) having a shaft portion 82a that is capable of
being inserted into the one of the ends of the cylindrical part 81,
and has a diameter larger than the inner diameter g3 of the other
end, and a head portion 82b (B72a) that is not capable of being
inserted through the insertion holes 2c, 2d and the through hole
61a. The cylindrical part 81 and the shaft part 82 are made from a
synthetic resin material.
[0427] On the reflection sheet 4, third through holes 43 (B54),
which have a diameter larger than the diameter of the head portion
82b of the shaft part 82 so as to allow the rivets 8 to be inserted
therein, and are formed into an elongated hole shape connected to
the through hole 41, are formed at positions corresponding to the
rivets 8. The third through holes 43, which are adjacent to one
another in a direction orthogonal to the row of the light-emitting
diode substrates 2, are positioned in a zigzag pattern, with their
shapes being alternately changed as an elongated hole connected to
one of the through holes 41 on the two sides and as an elongated
hole connected to the other.
[0428] As described above, the rivets 8, inserted through the
respective insertion holes 2c and 2d of the light-emitting diode
substrate 2 as well as through the third through holes 43 of the
reflection sheet 4, have an arrangement in which eight rivets 8,
located on one end side of eight sheets of light-emitting diode
substrates 2 that are adjacent to one another in a direction
orthogonal to the rows of the light-emitting diode substrates 2,
are positioned in a zigzag pattern, with eight rivets 8 on the
other end side being also positioned in a zigzag pattern, so that
influences by the rivets 8 to cause a reduction of luminance are
dispersed, and luminance irregularities in illumination light can
be consequently suppressed.
[0429] The following description will discuss a sequence of
processes by which three sheets of the light-emitting diode
substrates 2 connected to one after another into one line are
supported on the support body 6 by using the rivets 8. First, after
positioning the insertion holes 2c and 2d of the respective
light-emitting diode substrates 2 onto the respective through holes
61a of the support body 6, the cylindrical part 81 is inserted
through the insertion hole 2c having a smaller size and the through
hole 61a from the one surface 2a of the respective light-emitting
diode substrates 2 so that the flange portion 81a is made in
contact with the one surface 2a of the light-emitting diode
substrates 2. Next, when the shaft portion 82a of the shaft part 82
is inserted until the head portion 82b has come into contact with
the flange portion 81a of the cylindrical part 81, the tip portion
of the cylindrical part 81 is pushed and widened outward by the
shaft portion 82a of the shaft part 82. The tip portion of the
cylindrical part 81, pushed and widened outward, is allowed to
press the shaft portion 82a of the shaft part 82 inward so as to be
maintained, while the tip portion of the cylindrical part 81 with a
widened diameter cannot be inserted through the through hole 61a of
the support body 6, with the result that the respective
light-emitting diode substrates 2 are secured on the support body 6
by the rivets 8.
[0430] After the rivets 8 have been attached to the insertion holes
2c having a smaller dimension, the rivets 8 are also attached to
the insertion holes 2d having a larger dimension in the same
manner, as described above, so that the respective light-emitting
diode substrates 2 are secured onto the support body 6 by the
rivets 8. At this time, in the case when, upon connecting the
adjacent light-emitting diode substrates 2 to each other by the
connectors 5, the positions of the two substrates are deviated from
appropriate positions in the substrate width direction, each of the
through holes 61a of the support body 6 is not positioned at the
center of the inserting hole 2d; however, since the dimension of
the through hole 2d in the substrate width direction is made
larger, the through hole 61a is not deviated from the range of the
insertion hole 2d so that each rivet 8 can be inserted through the
insertion hole 2d and the through hole 61a so as to be
attached.
[0431] After the rivets 8 have been attached to all the insertion
holes 2c and 2d of the light-emitting diode substrates 2, lenses 3
are inserted into the through holes 41, the connectors 5 are
inserted into the second through holes 42, and the respective
rivets 8 are inserted into the third through holes 43, and in this
state, the reflection sheet 4 is made face to face with the
light-emitting diode substrates 2, and mounted thereon.
[0432] FIG. 76 is a cross-sectional view that illustrates a
structure of a display device in which a light source device in
accordance with the present invention is installed. The display
device, which has a display surface 72a on its front side, is
provided with a display unit 70 (A) having a substantially
rectangular parallelepiped shape, a light source device A (B)
disposed on the rear side of the display unit 70, and a cabinet 71
(D) that conceals the peripheral edge portion of the display unit
70 and the rear side of the light source device A.
[0433] The display unit 70 has a display panel 72 (A1) having a
display surface 72a, and an optical sheet 73 (C) that is placed on
the rear side of the display panel 72. The peripheral edge portion
of the display panel 72 is sandwiched by a front-holding frame 74
(A2) and a rear-holding frame 75 (A3) in a front to rear direction
to be held therein so that a panel module is formed, with the
rear-holding frame 75 being attached to the peripheral edge portion
of the support body 6.
[0434] The optical sheet 73 is a laminated sheet formed by stacking
a diffusion plate having a comparatively high thickness that
diffuses light emitted by the light-emitting diode 1 as a light
source, and synthesized resin sheets having comparatively low
thicknesses, such as a reflective polarizing plate, a prism sheet
and a diffusion sheet. The peripheral edge portion of the optical
sheet 73 is sandwiched and held by the frame portion 62 of the
support body 6 and the rear-holding frame 75.
[0435] The cabinet 71 is provided with a cabinet front divided unit
71a (D1) that conceals the peripheral edge portion on the front
side of the display unit 70, and a cabinet rear divided unit 71b
(D2) having a deep dish shape so as to conceal the peripheral edge
portion and the rear side of the light source device A, and is
attached to the frame portion 62 of the support body 6 with male
screws.
[0436] Although not shown, onto the other surface 6b of the plate
portion 61, a plurality of circuit boards, such as a power supply
circuit board to be connected to a connecting electrode unit 22 of
the light-emitting diode substrate 2 by a second connector, a
control circuit board, which carries out driving and controlling
operations on the display unit, and a signal processing circuit
board, which processes an image signal for use in displaying an
image on the display surface of the display unit, are attached.
[0437] A specific structure for use in arranging a plurality of
fixtures (rivets 8) in a zigzag pattern is not necessarily limited
to the above-mentioned the embodiment 4. FIG. 77 is a plan view
illustrating one portion of a light source device in accordance
with another embodiment of the present invention. In this
embodiment, a spaced distance L between rivets 8 (B7) to be
arranged in a zigzag pattern in the longitudinal direction of the
light-emitting diode substrates 2 is made smaller than that of the
aforementioned embodiments, and each of the third through holes 43
(B54) of the reflection sheet 4 through which the rivets 8 are
inserted is a round hole separated from the through hole 41
(B53).
[0438] In the aforementioned the embodiment 4, two insertion holes
2c and 2d for use in inserting the rivets 8 are formed on the two
ends in the longitudinal direction of the rectangular
light-emitting diode substrate 2; however, another structure may be
used in which insertion holes are respectively formed on the two
ends in the longitudinal direction of the light-emitting diode
substrate 2 as well as on positions inside the two ends thereof so
that the respective insertion holes that are adjacent to each other
in a direction orthogonal to the line of the light-emitting diode
substrates 2 are located in a zigzag pattern.
[0439] In the aforementioned the embodiment 4, a plurality of
rectangular light-emitting diode substrates 2 are aligned in a
longitudinal direction side by side in one line, and a plurality of
lines are arranged in parallel with one another in the width
direction; however, the structure of the light-emitting diode
substrates is not necessarily limited to the embodiment 4. FIG. 78
is a plan view in which one portion of a light source device in
accordance with a second other embodiment of the present invention
is disassembled, and FIG. 79 is a plan view that illustrates
partial members of the light source device in accordance with the
second other embodiment. In this embodiment, a rectangular
light-emitting diode substrate 2A (B3) is made longer than the
light-emitting diode substrate 2 of the aforementioned embodiments,
and eight light-emitting diode substrates 2A are arranged in
parallel with one another in the substrate width direction with
substantially the same interval as the assembling interval of the
light-emitting diodes 1 on the light-emitting diode substrate 2A.
The connecting portions 22 (B32) are formed on the two ends in the
longitudinal direction of each light-emitting diode substrate 2A,
and no connecting portions 21 (B31) for the connectors 5 are
prepared.
[0440] Six insertion holes 2e1 to 2e6 for use in inserting the
rivets 8 are formed at six positions in the longitudinal direction
of each light-emitting diode substrate 2A. The insertion hole 2e1
on one end in the longitudinal direction of the light-emitting
diode substrate 2A is a round hole in the same manner as in the
insertion hole 2c of the aforementioned embodiments, and the other
five insertion holes 2e2 to 2e6 are elongated holes in the same
manner as in the insertion hole 2d of the aforementioned
embodiments. In eight light-emitting diode substrates 2A that are
adjacent to one another in the parallel arranging direction of the
light-emitting diode substrates 2A, the insertion holes 2e1 to 2e6
at the respective six positions are arranged in a zigzag pattern.
That is, eight insertion holes 2e1 on one end of the eight
light-emitting diode substrates 2A arranged in parallel with one
another are positioned in a zigzag pattern, and in the same manner,
sets of eight insertion holes 2e2, eight insertion holes 2e3, eight
insertion holes 2e4, eight insertion holes 2e4, eight insertion
holes 2e5, and eight insertion holes 2e6 at the other positions are
arranged in a zigzag pattern. Third insertion holes 43 are formed
on the reflection sheet 4A in association with the positions of the
respective insertion holes 2e1 to 2e6, and no second insertion
holes 42 corresponding to the connectors 5 are prepared.
[0441] In the aforementioned the embodiment 4, the rivet 8 composed
of two members of a cylindrical part 81 and an shaft part 82 is
used as the fixture; however, the fixture may be prepared as a
rivet made of a single member, or in addition to the rivet, vises,
bolts and nuts, etc. may be used.
[0442] Moreover, in the aforementioned the embodiment 4, the third
through hole 43 having a diameter larger than the diameter of the
head portion 82b of the rivet 8 is formed, with the head portion
82b being placed inside the third through hole 43, so that the
extension and contraction of the reflection sheet 4 due to thermal
expansion can be permitted; however, in addition to this structure,
another structure may be proposed in which the diameter of the head
portion 82b is made larger than the diameter of the third through
hole 43, and the outer circumferential portion of the head portion
82b is spaced from the circumference of the third through hole 43
of the reflection sheet 4, and opposed thereto so that the head
portion 82b may be used for preventing the reflection sheet 4 from
being biased in a separating direction from the light-emitting
diode substrate 2.
[0443] In the aforementioned the embodiment 4, the light source
device of the present invention is applied to illumination for a
display panel of a liquid crystal display device; however, the
light source device may be applied to illumination for a display
panel of another display device having another light-emitting
system different from the liquid crystal display device.
Embodiment 5-1
[0444] FIG. 80 is a schematic longitudinal cross-sectional diagram
showing a display device.
[0445] In the figure, 1 is a rectangular display panel (A1) with
liquid crystal, and this display panel 1 is formed so that the
transmittance of light is adjusted by controlling the voltage
applied to the liquid crystal, and thus an image is displayed. The
display panel 1 has the peripheral portion sandwiched between a
front supporting frame 2 (A2) and a rear supporting frame 3 (A3)
and is contained in a front cabinet 4 (D1) in rectangular frame
form. The front cabinet 4 is located in the periphery of the front
supporting frame 2 and the rear supporting frame 3. The front
cabinet 4 has a rectangular opening, and the size of the opening
corresponds to the size of the display panel 1. The rear side of
the display panel 1 is provided with a number of optical sheets 5
(C) for condensing light from the below-described light-emitting
diodes 9 (light-emitting elements) towards the display panel 1.
[0446] The rear side of the optical sheets 5 is provided with a
diffusing plate 6 for uniformly diffusing light from the
light-emitting diodes 9 (B1). The diffusing plate 6 is supported by
the edge portion of a support plate 7 (B6) in dish form. A number
of substrates 8 (B3) are provided side-by-side on the front surface
of the support plate 7, and a film made of a heat conductive
substance, for example, a metal, having a heat releasing pattern
(not shown) is formed on the rear surface of the substrates 8.
[0447] A number of light-emitting diodes 9, 9 . . . 9 are mounted
on the front surface of the substrates 8. The light-emitting diodes
9 have a plate portion 9a secured to the front surface of a
substrate 8 and a spindle portion 9b protruding to the front from
the plate portion. Lenses 10, 10 . . . 10 (A2) for diffusing light
are respectively placed in front of the light-emitting diodes 9, 9
. . . 9. The lenses 10 have a thick portion bulging towards the
front, and a recess 10a is created so as to match the shape of the
spindle portion 9b at the center of the rear surface of the lenses
10. The spindle portion 9b is contained inside the recess 10a.
Three protrusions 10b, 10b and 10b (B22) sticking out towards the
substrate 8 side are provided in the periphery of the lenses 10,
and the top of the protrusions 10b is attached to the front surface
of the substrates 8 by means of an adhesive.
[0448] Individual supports (not shown) for supporting a reflection
sheet 11 (B5) in dish form are provided on the left and right of
the above-described support plate 7. A number of sheet holes 11a
(B53) through which the above-described lenses 10 are inserted are
provided at the bottom of the reflection sheet 11. The respective
lenses 10 protrude to the front side through the above-described
sheet holes 11a.
[0449] The rear side of the support plate 7 is provided with a rear
cabinet 12 (D2) in dish form. The length and the width of the rear
cabinet 12 are approximately the same as the length and width of
the front cabinet 4 (1), and the edge portion of the rear cabinet
12 and the edge portion of the front cabinet 4 face each other.
Engaging protrusions and engaging recesses, not shown, are
respectively provided on the edge portions of the front cabinet 4
and the rear cabinet 12 so that the engaging protrusions and the
engaging recesses are engaged and the front cabinet 4 is secured to
the rear cabinet 12. Here, a number of circuit boards, including a
power supplying circuit board, connected to electrodes of the
substrates 8 through connectors, a control circuit board for
driving and controlling the display panel 1, and a signal
processing circuit board for processing an image signal to be
displayed on the display surface of the display panel 1, are
provided between the support plate 7 and the rear cabinet 12.
[0450] FIG. 81 is a schematic front diagram showing light-emitting
diodes 9 and substrates 8 that are provided with a reflection sheet
11, FIG. 82 is a graph showing the amount of emitted light in
relation to the angle of the light emitted from a light-emitting
diode 9, and FIG. 83 is a cross-sectional diagram along line IV-IV
in FIG. 81 where rivets are schematically shown.
[0451] The substrates 8 are provided with a number of first through
holes 8a, 8a . . . 8a (B33, B34) in the longitudinal direction of
the substrates 8. The above-described support plate 7 is provided
with a number of second through holes 7a, 7a . . . 7a (B64) in the
locations corresponding to the first through holes 8a, 8a . . . 8a.
The diameter of the second through holes 7a is approximately the
same as the diameter of the first through holes 8a. The reflection
sheet 11 is provided with holes 11b (B54) in the locations
corresponding to the first through holes 8a, and the holes 11b have
a diameter greater than that of the first through holes 8a. As
shown in FIG. 81, certain parts of the reflection sheet 11 are
provided with through holes 11c in elliptical form that are
connected to the above-described sheet holes 11a and extend in the
longitudinal direction of the substrates 8. The shorter diameter
and the longer diameter of the through holes 11c are greater than
the diameter of the head portion of the below-described rivet
20.
[0452] As shown in FIG. 81, rivets 20 are provided in the holes 11b
between the lenses 10. The rivets 20 (B7) made of a metal or a
carbon material, for example, are inserted through the first
through holes 8a and the second through holes 7a that correspond to
the holes 11b, and the substrates 8 are secured to the support
plate 7 by means of these rivets 20. The rivets 20 have a reception
rivet 22 (B71) and an insertion rivet 21 (B72).
[0453] The reception rivet 22 has a stopper portion 22a (B71a) in
annular form having a diameter greater than the diameter of the
above-described first through holes 8a, and the outer periphery of
the stopper portion 22a is stopped at the edge portion of a first
through hole 8a outside the first through hole 8a and inside the
hold 11b. A number of elastic portions 22b are provided
side-by-side in the inner peripheral portion of the stopper portion
22a. The elastic portions 22b protrude along the axis of the
stopper portion 22a and are inserted through a first through hole
8a and a second through hole 7a. The length of the elastic portions
22b along the axis is greater than the length of the first through
holes 8a and the second through holes 7a along the axis, and thus
the ends of the elastic portions 22b stick out from the second
through hole 7a along the axis.
[0454] Contact portions 22c are provided and integrated with the
ends of the elastic portions 22b so as to protrude towards the
inside along the diameter of the stopper portions 22a, and there is
a gap between the contact portions 22c and 22c.
[0455] The below-described leg portion 21b makes contact with the
inside of the contact portions 22c so that the elastic portions 22b
are bent outwards, and the elastic portions 22b make contact with
the edge portion of the second through hole 7a. As a result, the
substrates 8 and the support plate 7 are sandwiched together
between the stopper portion 22a and the elastic portions 22b.
[0456] The above-described insertion rivets 21 have a head portion
21a (B72a) with a diameter greater than the above-described holes
11b, and a cylindrical leg portion 21b is provided at the center of
the head portion 21a so as to be perpendicular to the head portion
21a. A tapered portion 21ba of the leg portion 21b is formed in
such a manner that the diameter of the leg portion 21b becomes
smaller as the location is closer to the end. The diameter of the
leg portion 21b at the portion closer to the head portion 21a is
approximately the same as the inner diameter of the above-described
stopper portion 22a and is greater than the distance between the
above-described contact portions 22c when the leg portion 21b is
not inserted. Here, the end portion of the head portion 21a sticks
out towards the leg portion 21b side, and the distance by which the
end portion of the head portion 21a sticks out is smaller than the
dimension in the axis direction of the above-described stopper
portion 22a, or the thickness of the above-described stopper
portion 22a.
[0457] The leg portion 21b of the insertion rivet 21 is inserted
into the engaging portion 22a so that the end of the leg portion
21b is inserted into the gap between the contact portions 22c. The
tapered portion 21ba of the leg portion 21b is formed so that the
above-described gap is spread when the leg portion 21b is inserted.
The elastic portions 22b are bent to the outside so as to make
contact with the edge portion of the second through hole 7a.
[0458] The head portion 21a makes contact with the stopper portion
22a, and the head portion 21a does not make contact with the
reflection sheet 11. There is a slight gap between the edge portion
of the head portion 21a that sticks out towards the leg portion 21b
side and the reflection sheet 11. When the reflection sheet 11 is
thermally expanded due to the light emitted from the light-emitting
diodes 9, the expansion and contraction of the thermally expanded
reflection sheet 11 is allowed so that the reflection sheet 11 is
not wrinkled. The reflection sheet 11 is supported by the end
portions of the head portions 21a. The support plate 7 and the
substrates 8 are sandwiched between the elastic portions 22b and
the stopper portions 22a with an appropriate pressure so that the
substrates 8 and the support plate 7 are made to make close
contact.
[0459] The thickness of the head portions 21a and the stopper
portions 22a is smaller than the height of the above-described
light-emitting diodes 9, and the top of the head portions 21a is
located lower than the top of the spindle portions 9b of the
light-emitting diodes 9.
[0460] As shown in FIG. 81, rivets 20 are provided in the through
holes 11c between the lenses 10. The shorter diameter and the
longer diameter of the through holes 11c in elliptical form are
greater than the diameter of the head portions (head portions 21a)
of the rivets 20, and therefore the head portions 21a are located
inside the through holes 11c. As shown in FIG. 83, the support
plate 7 and the substrates 8 are sandwiched between the elastic
portions 22b and the stopper portions 22a under an appropriate
pressure so that the substrates 8 and the support plate 7 are made
to make close contact in the same manner as the rivets 20 provided
in the holes 11b. In addition, the thickness of the head portions
21a and the stopper portions 22a is smaller than the height of the
above-described light-emitting diodes 9, and the top of the head
portions 21a is located beneath the top of the spindle portions 9b
of the light-emitting diodes 9.
[0461] In the display device according to the embodiment 5-1, the
distance between the substrate 8 and the top of the head portions
21a is smaller than the distance between the substrate 8 and the
top of the lenses 10 in accordance with the range in which light is
diffused by the lenses 10, and thus the diffused light can be
prevented from being blocked by the head portions 21a. FIG. 82
shows the amount of light emitted from the light-emitting diodes 9
relative to the angle of the light emission. The amount of light
was measured at a point 20 mm away from the light-emitting diodes
9. It can be seen from FIG. 82 that the amount of emitted light was
zero when the angle of light emission was 70 degrees or more
relative to the angle of light emission at zero degrees (top of the
light-emitting diodes 9). Therefore, the light diffused by the
lenses 10 can be prevented from being blocked by the head portions
21a when the distance between the substrate 8 and the top of the
head portions 21a of the insertion rivets 21, which are provided at
a distance from the lenses 10 attached to the front surface of the
substrate 8 along the front surface of the substrate 8, is smaller
than the distance between the substrate 8 and the top of the lenses
10, and thus the brightness on the display panel 1 can be prevented
from becoming uneven and the display quality can be prevented from
lowering.
[0462] In addition, a case where light emitted from the
light-emitting diodes 9 is dispersed at a large angle when passing
through the lenses 10 is taken into consideration, and thus the
distance between the substrate 8 and the top of the head portions
21a is smaller than the distance between the substrate 8 and the
top of the light-emitting diodes 9 so that the light emitted from
the light-emitting diodes 9 can be prevented without fail from
being blocked by the head portions 21a, and the brightness on the
display panel 1 can be prevented without fail from becoming
uneven.
[0463] In addition, the substrate 8 can be secured to the support
plate 7 by means of rivets 20 and the head portions 21a support the
reflection sheet 11, and thus the reflection sheet 11 can be
prevented from peeling off the support plate 7, and at the same
time, the number of parts used for the display device can be
reduced and the manufacturing time of the display device can be
shortened. In addition, the manufacturing cost for the display
device can be reduced. Furthermore, the reflection sheet 11 is not
wrinkled even when the reflection sheet 11 expands and contracts
due to a sudden change in temperature because of a gap between the
head portions 21a and the reflection sheet 11.
[0464] When the rivets 20 are used to secure the substrate 8 to the
support plate 7, the substrate 8 can be secured quickly to the
support plate 7 without fail, and therefore the manufacturing time
of the display device can be shortened and the manufacturing cost
for the display device can be reduced.
[0465] In addition, light-emitting diodes 9 are used as the
light-emitting elements so that the heat emission can be reduced
and the turning on and off of light can be easily controlled.
[0466] Here, the rivets are not limited to those made of an
insertion rivet 21 and a reception rivet 22 and may have such a
structure without a reception rivet 22 that a number of leg
portions 21b are provided in a head portion 21a, and each of the
number of leg portions 21b is provided with an engaging portion
that protrudes towards the outside from the end of the leg portion
21b so that the support plate 7 and the substrate 8 are sandwiched
between the engaging portions and the head portion 21a. In the
display device according to the embodiment, the head portions 21a
are located behind the spindle portions 9b, but the top of the head
portions 21a may be located between the top of the lenses 10 and
the top of the spindle portions 9b. In addition, though
light-emitting diodes 9 are used as the light-emitting elements in
the display device according to the embodiment, LDs (laser diodes)
and the like may be used.
(Modification)
[0467] A modification of the display device according to the
embodiment 5-1 is described below in detail in reference to the
drawings. FIG. 84 is a schematic cross-sectional diagram showing
rivets 20 in the modification.
[0468] As shown in FIG. 84, no lenses 10 are provided in front of
the light-emitting diodes 9 (B1) in the modification, and the
light-emitting diodes 9 directly illuminate diffusing plate 6. The
light-emitting diodes 9 illuminate a range at a wide angle, and the
light emitted from the light-emitting diodes 9 is sufficiently
diffused by the diffusing plate 6 so as to illuminate the display
panel 1. In the modification as well, the head portions 21a and the
engaging portions 22a have a thickness smaller than the length of
the above-described light-emitting diodes 9, and thus the top of
the head portions 21a is located beneath the top of the spindle
portions 9b of the light-emitting diodes 9.
[0469] As a result, the distance between the substrate 8 and the
top of the head portions 21a can be made smaller than the distance
between the substrate 8 and the top of the light-emitting diodes 9
in accordance with the range illuminated by light emitted from the
light-emitting diodes 9 so that the light emitted from the
light-emitting diodes 9 can be prevented without fail from being
blocked by the head portions 21a, and the brightness on the display
panel 1 can be prevented without fail from becoming uneven.
Embodiment 5-2
[0470] FIG. 85 is a schematic cross-sectional diagram showing
screws in a display device.
[0471] In this display device, the substrate 8 is secured to the
support plate 7 by means of screws 30 instead of rivets 20 (B7).
The above-described support plate 7 is provided with a number of
second through holes 7b, 7b . . . 7b in the locations corresponding
to the first through holes 8a, 8a . . . 8a (B64). Female screws are
threaded inside the second through holes 7b, and the diameter of
the second through holes 7b is almost equal to the diameter of the
first through holes 8a. The screws 30 are inserted into the first
through holes 8a so as to be engaged with the second through holes
7b.
[0472] The screws 30 have a head portion 30a in disc form with a
large diameter and a shaft portion (leg portion) 30b in cylindrical
form that protrudes from the center of the head portion 30a. The
diameter of the head portion 30a is slightly greater than the
diameter of the above-described holes 11b. The shaft portion 30b is
a male screw and is inserted through a washer 31. The inner
diameter of the washer 31 is slightly greater than that of the
shaft portion 30b and is approximately the same as that of the
first through holes 8a. The shaft portion 30b is inserted into a
first through hole 8a from the substrate 8 side so as to be engaged
with a second through hole 7b in such a state as being inserted
through the washer 31. Therefore, the washer 31 is located between
the periphery of the head portion 30a and the edge of the first
through hole 8a.
[0473] The washer 31 is slightly thicker than the reflection sheet
11, and as shown in FIG. 85, there is a slight gap between the head
portion 30a and the reflection sheet 11. In addition, the washers
31 and the head portions 30a are thinner than the above-described
light-emitting diodes 9 so that the top of the head portions 30a is
located beneath the top of the spindle portions 9b of the
light-emitting diodes 9.
[0474] Here, the diameter of the head portions 30a is slightly
greater than the diameter of the above-described holes 11b, and
therefore the peripheral portion of the head portions 30a and the
edge of the holes 11b face each other with a slight gap in between,
and the peripheral portions of the head portions 30a support the
reflection sheet 11. The substrate 8 is held between the washers 31
and the support plate 7, and thus is secured tightly to the support
plate 7 when the screws 30 are tightened.
[0475] In the display device according to the embodiment 5-2, the
distance between the substrate 8 and the top of the head portions
30a is smaller than the distance between the substrate 8 and the
top of the lenses 10 in accordance with the range in which light is
diffused by the lenses 10, and thus the diffused light can be
prevented from being blocked by the head portions 30a. Therefore,
the brightness on the display panel 1 can be prevented from being
uneven and the display quality can be prevented from lowering.
[0476] In addition, the distance between the substrate 8 and the
top of the head portions 30a is smaller than the distance between
the substrate 8 and the top of the light-emitting diodes 9 in
accordance with the range that is illuminated by light emitted from
the light-emitting diodes 9 so that the light emitted from the
light-emitting diodes 9 can be prevented without fail from being
blocked by the head portions 30a, and the brightness on the display
panel 1 can be prevented without fail from becoming uneven.
[0477] In addition, the substrate 8 is firmly secured to the
support plate 7 using screws 30, and therefore the substrate 8 can
be prevented without fail from disengaging from the support plate
7.
[0478] Here, the light emitted from the light-emitting diodes 9 may
illuminate a range at a wide angle, and thus the lenses 10 may be
removed. In this case, the distance between the substrate 8 and the
top of the head portions 30a is smaller than the distance between
the substrate 8 and the top of the light-emitting diodes 9 in
accordance with the range illuminated by the light emitted from the
light-emitting diodes 9 so that the light emitted from the
light-emitting diodes 9 can be prevented without fail from being
blocked by the head portions 30a, and the brightness on the display
panel 1 can be prevented without fail from becoming uneven.
[0479] The same symbols as for the components in the display device
according to the embodiment 5-1 are attached to the components in
the display device according to the embodiment 5-2, and the
detailed descriptions of these are not repeated.
Embodiment 6-1
[0480] FIG. 86 is a cross-sectional diagram showing an enlargement
of a portion of the structure in the display device according to
the present invention, FIG. 87 is a cross-sectional diagram showing
an enlargement of a portion of the structure of the light source,
FIG. 88 is a front diagram showing the structure of the light
source where the peripheral portion is omitted, FIG. 89 is a front
diagram showing the structure of the light source where the
peripheral portion and the light reflection sheet are omitted, FIG.
90 is a front diagram showing the structure of the light reflection
sheet where the peripheral portion is omitted, FIG. 91A is a
cross-sectional diagram showing the structure of a first shaft
portion as viewed from the side, FIG. 91B is a cross-sectional
diagram showing the structure of the first shaft portion as viewed
from the top, FIG. 92A is a cross-sectional diagram showing the
structure of a second shaft portion as viewed from the side, FIG.
92B is a cross-sectional diagram showing the structure of the
second shaft portion as viewed from the top, and FIG. 93 is a
cross-sectional diagram showing the structure of a third shaft
portion as viewed from the top.
[0481] The display device shown in the figures is a liquid crystal
television, in other words, a liquid crystal display device, having
a display unit A in approximately rectangular parallelepiped form
having a display screen for displaying TV images on the front side
(one side), a light source portion (light source unit) B in
approximately rectangular parallelepiped form, which is provided on
the rear side (the other side) of the display unit A, and a cabinet
C (D) that covers the periphery of the display unit A and the rear
side of the light source portion B.
[0482] The display unit A has a display panel 1 (A1) having a
display screen and an optical sheet 2 (C) provided on the rear side
of the display panel 1. The peripheral portion of the display panel
1 is sandwiched between and supported by a front support frame 11
(A2) and a rear support frame 12 (A3) so as to form a panel
module.
[0483] The optical sheet 2 is a multilayer body where a relatively
thick diffusing plate for diffusing light emitted from the
light-emitting diodes 3 (B1), which are the light source, and
relatively thin synthetic resin sheets, such as a reflective
polarizing plate, a prism sheet and a diffusing sheet, are layered
on top of each other.
[0484] The light source portion B is provided with a number of
light-emitting diodes 3 laid out on a grid, which are the light
source; a number of light-emitting diode substrates 4 (B3), on
which light-emitting diodes 3 are mounted on one side 4a and which
are aligned in a number of rows; a number of connectors 5 (B4) for
connecting the adjacent light-emitting diode substrates 4, 4; a
number of lenses 6 (B2) for diffusing light emitted from the
light-emitting diodes 3, which are attached to one side 4a of the
light-emitting diode substrates 4 so as to face the top of the
light-emitting diodes 3; a light reflection sheet 7 (B5) for
reflecting light diffused by the lenses 6, which has holes 73 (B53)
inside of which the lenses 6 are contained and faces the
above-described side 4a and one side of the connectors 5; a support
body 8 (B6) for supporting the light-emitting diode substrates 4
aligned in a number of lines; first shafts 9 and second shafts 10
for positioning the light reflection sheet 7 relative to the
support body 8; and third shafts 20 for attaching the two ends of
the light-emitting diode substrates 4 to the support body 8 so as
to prevent the light reflection sheet 7 from sliding in the
direction of the thickness. The second shafts 10 and the third
shafts 20 are the same parts.
[0485] The light-emitting diode substrates 4 are in long,
rectangular form having a circuit portion on one side 4a and
through holes 4b, 4b (B33, B34) at the two ends, and are aligned in
a number of lines so as to be at a distance away from each other
both in the longitudinal direction and the lateral direction on one
side 8a of the support body 8 in rectangular form. The two ends of
each light-emitting diode substrate 4 are secured to the support
body 8 by means of the third shafts 20 (B7) that are inserted into
the through holes 4b, 4b in such a manner that the two can slide
relative to each other. A number of light-emitting diodes 3 are
mounted at a distance from each other in the longitudinal
direction, as shown in FIG. 89, on one side 4a of each of the
light-emitting diode substrates 4, and connecting portions 41, 41
are provided at either end of one side 4a in the longitudinal
direction.
[0486] Light-emitting diode substrates 4 are aligned in a number of
lines, and the light-emitting diode substrates 4 in each row are
connected to each other through connectors 5 for connecting two
adjacent connecting portions 41, 41 in such a manner that the
connecting portion of one light-emitting diode substrate 4 in a
certain row is connected to the below-described power source
circuit board by means of a second connector (B41) and the
connecting portion of the other light-emitting diode substrate 4 in
the same line is connected to a short connector.
[0487] The support body 8 is made of a metal plate formed into a
case shape having a rectangular plate 81 (B61), a frame 82 (B62)
connected to the periphery of the plate 81, and four rims 83 (B63)
connected to the outer periphery of the frame 82. A first position
setting hole 84 is provided at the center of the plate 81, a second
position setting hole 85 is provided in the periphery that is away
from the first position setting hole 84 in the direction towards
the sheet surface, a number of engaging holes 86 are provided in
the portions corresponding to the through holes 4b in the plate 81
so as to be away from each other around the periphery, and
light-emitting diode substrates 4 are laid out on a grid and
supported on one side 8a of the plate 81. In addition, a number of
holes for attachment are provided in the rims 83 at a distance away
from each other around the periphery so that the peripheral portion
of the display unit A can be attached.
[0488] A power source circuit board to be connected to one end in
longitudinal direction of a light-emitting diode substrate 4 by
means of second connectors (B41) is attached on the other side of
the plate 81, and a control circuit board for driving and
controlling the display unit A to be connected to the other end in
longitudinal direction of the light-emitting diode substrate 4 is
attached on the other side of the plate 81. In addition, a signal
processing circuit board for processing an image signal for
displaying an image on the display unit A is attached to the center
in longitudinal direction of the light-emitting diode substrate 4
on the other side of the plate 81.
[0489] The light reflection sheet 7 is made of one synthetic resin
sheet having high reflecting properties and being rectangular so as
to correspond to the display panel 1 and the support body 8, and
has a flat portion 71 (B51) that is slightly smaller than the plate
81 and frame portions 72 (B52) connected to the four sides of the
flat portion 71 through folding lines, which lies diagonally
outwards relative to the flat portion 71, and thus forms a
case.
[0490] A through hole 74 for preventing the light reflection sheet
7 from shifting its position relative to the plate 81 along the
sheet surface is provided at the center of the flat portion 71, and
a long hole 75 (B57) for preventing the light reflection sheet 7
from shifting its position relative to the plate 81 towards the
periphery is provided in a location that is away from the through
hole 74 towards the periphery. The through hole 74 is circular and
is provided in a location corresponding to the first position
setting hole 84. The long hole 75 is long in the direction in which
the long hole 75 is away from the through hole 74, the width in the
direction perpendicular to the direction in which the long hole 75
is away from the through hole 74 is narrow and is provided in a
location corresponding to the second position setting hole 85. The
width of the long hole 75 is almost the same as the diameter of the
through hole 74. In addition, a number of second holes 76 are
provided in the flat portion 71 in locations that correspond to the
engaging holes 86, and the long hole 75 is one of the second holes
76 in such a manner that the long hole 75 is connected to a hole
73.
[0491] Holes 73 (B53) of which the diameter is slightly greater
than that of the lenses 6 are provided in the flat portion 71 in
the locations that correspond to the lenses 6, and moving portions
that move in the direction of the thickness when making contact
with a connector 5 are provided together with slits (B56, B59) in
the flat portion 71 in the locations that correspond to the
connectors 5.
[0492] First shafts 9 (B7) have a flexible cylinder 91 (B71) and a
pin 92 (B72) that is fitted into the flexible cylinder 91. The
flexible cylinder 91 has a collar portion 91a (B71a) at one end and
a set shaft portion 91b connected to the collar portion 91a, a
number of slits 91c (B71b) in the direction of the shaft and
portions bulging inwards at the other end. The pieces between the
slits 91c are flexible in the direction of the diameter, and the
flexible cylinder 91 is fitted into a through hole 74 and a first
position setting hole 84. The set shaft portion 91b has a diameter
slightly smaller than that of through holes 74, and when the set
shaft portion 91b is fitted into a through hole 74, the light
reflection sheet 7 can be prevented from shifting its position
along the sheet surface in the configuration.
[0493] The pin 92 has a collar portion 92a (B72a) at one end where
the collar portion 92a has a diameter greater than that of the
collar portion 91a of the flexible cylinder 91. When the pin 92 is
fitted into the flexible cylinder 91, the pin 92 makes contact with
the bulging portions inside the flexible cylinder 91 so as to bend
the pieces between the slits 91c to the outside in the direction of
the diameter from the first position setting hole 84 and prevents
the pieces between the slits 91c from recovering their shapes due
to elasticity, and thus the structure is not allowed to be removed
from the plate 81 and the set shaft portion 91b can hold the light
reflection sheet 7 in its set position.
[0494] Second shafts 10 have a flexible cylinder 10a and a pin 10b
that is fitted into the flexible cylinder 10a. The flexible
cylinder 10a has a collar portion 10c at one end and a number of
slits 10d in the direction of the shaft and portions bulging
inwards at the other end. The pieces between the slits 10d are
flexible in the direction of the diameter, and the flexible
cylinder 10a is fitted into the long hole 75 and a second position
setting hole 85. The collar portion 10c, which is a position
setting portion, has a diameter slightly smaller than the width of
the long hole 75, and when the collar portion 10c is fitted into
the long hole 75, the light reflection sheet 7 can be prevented
from shifting its position towards the periphery with the first
shaft 9 at the center in the configuration.
[0495] The pin 10b has a flange 10e at one end where the flange 10e
has a diameter greater than that of the collar portion 10c of the
flexible cylinder 10a. When the pin 10b is fitted into the flexible
cylinder 10a, the pin 10b makes contact with the bulging portions
inside the flexible cylinder 10a so as to bend the pieces between
the slits 10d to the outside in the direction of the diameter from
the second position setting hole 85 and prevents the pieces between
the slits 10d from recovering their shapes due to elasticity, and
thus the structure is not allowed to be removed from the plate
81.
[0496] Third shafts 20 have a flexible cylinder 20a and a pin 20b
that is fitted into the flexible cylinder 20a. The flexible
cylinder 20a has a flange 20c at one end and a number of slits 20d
in the direction of the shaft and portions bulging inwards at the
other end. The pieces between the slits 20d are flexible in the
direction of the diameter, and the flexible cylinder 20a can be
fitted into an engaging hole 86. The pin 20b has a flange 20e at
one end where the flange 20e has a diameter greater than that of
the flange 20c and the second holes 76. When the pin 20b is fitted
into the flexible cylinder 20a, the pin 20b makes contact with the
bulging portions inside the flexible cylinder 20a so that the
pieces between the slits 20d are bent to the outside in the
direction of the diameter from the engaging hole 86 and the pieces
between the slits 20d are prevented from recovering their shapes
due to elasticity, and thus the structure is not allowed to be
removed from the plate 81. In addition, there is a slight gap
between the inner surface of the flange 20e and the sheet surface
of the light reflection sheet 7 so that the thermal expansion and
contraction of the light reflection sheet 7 in the direction
towards the sheet surface can be allowed, and the flange 20e
prevents the light reflection sheet 7 from moving in the direction
of the thickness relative to the light-emitting diode substrate 4
in the configuration.
[0497] The cabinet C has a cabinet front divided unit 21 (D1) for
covering the periphery portion of the display unit A on the front
side and a cabinet rear divided unit 22 (D2) in dish form for
covering the peripheral portion and the rear side of the light
source portion B, and is attached to the frame 82 of the support
body 8 by means of male screws.
[0498] In the thus-formed display device, the support body 8 is
placed on a working table in such a manner that the opening faces
upwards, a number of rows of two adjacent light-emitting diode
substrates 4, 4 are aligned on one side 8a of the plate 81 in the
support body 8, a connector 5 makes connection between adjacent
ends of the light-emitting diode substrates 4, 4 in each line, and
flexible cylinders 20a of third shafts 20 are fitted into engaging
holes 86 through the through holes 4b, 4b provided at the two ends
of the light-emitting diode substrates 4 in each row.
[0499] After the light-emitting diode substrates 4 in lines are
attached, the light reflection sheet 7 is provided so as to face
the entire surface of the light-emitting diode substrates 4 in
lines in such a manner that the lenses 6 are contained in the holes
73 in the light reflection sheet 7 and the moving portions cover
the connectors 5.
[0500] Flexible cylinders 91 of first shafts 9 are fitted into the
first position setting holes 84 in the plate 81 through the through
holes 74 in the light reflection sheet 7, and pins 92 are fitted
into the flexible cylinders 91 so that the circumferential position
of the light reflection sheet 7 can be set relative to the plate 81
along the sheet surface. In addition, flexible cylinders 10a of
second shafts 10 are fitted into the second position setting holes
85 in the plate 81 through the long holes 75 of the light
reflection sheet 7, and pins 10b are fitted into the flexible
cylinders 10a so that the position of the light reflection sheet 7
can be set relative to the plate 81, and at the same time, the long
holes 75 can move relative to the light reflection sheet 7.
Furthermore, when pins 20b are fitted into the flexible cylinders
20a of the third shafts 20 through the second holes 76 in the light
reflection sheet 7, the light reflection sheet 7 can be attached to
the plate 81 in such a manner that the light reflection sheet 7 can
move relative to the plate 81 while the flanges 20e prevent the
reflection sheet 7 from moving in the direction of the thickness
relative to the light-emitting diode substrates 4.
[0501] After the light reflection sheet 7 is attached, an optical
sheet 2 is placed on top of the light reflection sheet 7, a display
unit A is placed on top of the optical sheet 2, the peripheral
portion of the display unit A is attached to the peripheral portion
of the support body 8 by means of a number of male screws, and the
cabinet C is attached.
[0502] As described above, the position of the light reflection
sheet 7 is set along the sheet surface by means of the through
holes 74, the first shafts 9 and the first position setting holes
84, and at the same time, the position of the light reflection
sheet 7 is set in the direction towards the periphery by means of
the long holes 75, the second shafts 10 and the second position
setting holes 85. The long holes 75 and the portion for attaching
the light reflection sheet 7 to the support body 8 allows the light
reflection sheet 7 and the support body 8 to move relative to each
other, and therefore when the light reflection sheet 7 thermally
expands along the sheet surface, this expansion and contraction can
be allowed through the long holes 75 and the second holes 76. In
addition, the long holes 75 and the second shafts 10 can prevent
the light reflection sheet 7 from shifting towards the periphery
with the first shafts 9 at the center, and thus the appropriate
position of the light reflection sheet 7 relative to the support
body 8 can be maintained. Therefore, an appropriate positional
relationship between the lenses 6 mounted on the light-emitting
diode substrates 4 and the holes 73 provided in the light
reflection sheet 7 can be maintained, the space between the lenses
6 and the holes 73 can be kept uniform, and the edge portions of
the holes 73 can be prevented from making a shadow, and thus
appropriate brightness can be maintained.
[0503] FIG. 94 is a cross-sectional diagram showing another
structure of a first shaft portion as viewed from the side, and
FIG. 95 is a cross-sectional diagram showing another structure of a
second shaft portion as viewed from the side. Though in the
above-described embodiments the first shaft portions 9, the second
shaft portions 10 and the third shaft portions 20 form rivets, the
first shaft portions 9, the second shaft portions 10 and the third
shaft portions 20 may form male screws.
[0504] In the case where the first shaft portions 9 are male
screws, as shown in FIG. 94, a first shaft portion 9 has a head
portion 9a having a diameter greater than that of the through holes
74 and a screw portion 9b that continues to the head portion 9a and
has a diameter slightly smaller than the through holes 74. The
screw portion 9b forms a set shaft portion. In this embodiment, the
screw portion 9b is inserted into a through hole 74 and is screwed
into a first position setting hole 84, and thus the position of the
light reflection sheet 7 can be prevented from shifting along the
sheet surface.
[0505] In the case where the second shaft portions 10 are male
screws, as shown in FIG. 95, a second shaft 10 has a head portion
10f having a diameter greater than the width of the long hole 75, a
mid-diameter shaft portion 10g that continues to the head portion
10f and has a diameter slightly smaller than the width of the long
hole 75, and a screw portion 10h that continues to the mid-diameter
shaft portion 10g and has a diameter smaller than that of the
mid-diameter shaft portion 10g. The mid-diameter shaft portion 10g
forms a position setting portion. In this embodiment, the screw
portions 10h are inserted into the long holes 75 and screwed into
the second position setting holes 85 so that the mid-diameter shaft
portions 10g are fitted into the long holes 75, and thus the
position of the light reflection sheet 7 can be prevented from
shifting towards the periphery with the first shafts 9 at the
center.
[0506] In the case where the third shafts 20 are male screws, in
the same manner as the second shafts 10 shown in FIG. 95, a third
shaft 20 has a structure with a head portion, a mid-diameter shaft
portion and a screw portion, and the detailed description thereof
and the drawings are omitted.
Embodiment 6-2
[0507] FIG. 96 is a plan diagram showing another structure of a
hole for preventing the position from shifting as viewed from the
top. In this display device, a long hole 75 is provided in a
location away from the hole 73 instead of the structure where one
of the second holes 76 provided in locations away from the through
holes 74 towards the periphery is a long hole 75, and the long hole
75 is connected to the hole 73.
[0508] In this structure, the rigidity of the flat portion 71
around the long hole 75 can be increased, and therefore even when a
load is applied to the edge of the long hole 75, the flatness of
the flat portion 71 can be easily maintained. In the embodiment
6-2, one of the second holes 76 may be a long hole 75 or a long
hole 75 may be provided in a location away from a second hole 76
towards the through hole 74.
Embodiment 6-3
[0509] FIG. 97 is a cross-sectional diagram showing another
structure of the first shaft portion and the second shaft portion
as viewed from the side. In this display device, a long hole 75 is
provided so as to be connected to an end of a through hole 74
instead of the structure where a long hole 75 is provided in a
location away from a through hole 74 towards the periphery.
[0510] One second position setting hole 85 is provided next to a
first position setting hole 84 in the plate 81. A second through
hole 4c is provided next to one through hole 4b in a light-emitting
diode substrate 4 so as to correspond to a second position setting
hole 85.
[0511] The collar portion 92a of a first shaft 9 is elliptical, and
a second shaft 10 is provided at an end of the collar portion 92a
in the longitudinal direction and is integrated with the collar
portion 92a. The second shaft 10 is a pin having a diameter smaller
than the width of the long hole 75 and is provided so as to be
parallel with the first shaft 9.
[0512] The long hole 75 is long in the direction in which the long
hole 75 is away from the center of the through hole 74, and the
width in the direction perpendicular to the direction in which the
long hole 75 is away from the center of the through hole 74 is
narrow. The width of the long hole 75 is almost the same as the
diameter of the second shaft 10.
[0513] In this embodiment, when the first shaft 9 is inserted into
the first position setting hole 84, the second shaft 10 can be
inserted into the second position setting hole 85, and therefore
the second shaft 10 can be prevented from not being attached. In
addition, the number of steps of attaching the second shafts 10 can
be reduced, and thus the efficiency in assembly can be
increased.
Embodiment 6-4
[0514] FIG. 98 is a schematic perspective diagram showing another
structure of the light source unit, and FIG. 99 is a front diagram
showing another structure of the portion for preventing the
position from shifting of the light reflection sheet. In this light
source unit, a through hole 74 is provided at the center of the
flat portion 71, four narrow collar pieces 77 are provided so as to
continue to the outer edge of the square frame 72 (B52) through
folding lines 7a, long holes 78 are provided at the two ends of
each collar piece 77, and position setting protrusions 87 to be
inserted into the long holes 78 are provided in the collar pieces
83 in the corners of the support 8.
[0515] The collar pieces 77 include long collar pieces 77a that
continue to the rectangular flat portion 71 through a long side and
short collar pieces 77b that continue to the rectangular flat
portion 71 through a short side. The two ends of the long collar
pieces 77a are provided with long holes 78 that are long in the
longitudinal direction of the long collar pieces 77a, and the two
ends of the short collar pieces 77b are provided with long holes 78
that are long in the longitudinal direction of the short collar
pieces 77b.
[0516] The position setting protrusions 87 are smaller than the
long holes 78 and are formed by cutting and folding part of the
flange portion 83. Part of the periphery of the position setting
protrusions 87 makes contact with the edge of the long holes 78 so
that the position of the light reflection sheet 7 can be prevented
from shifting towards the periphery, and the gap between the
position setting protrusions 87 and the long holes 78 can allow the
light reflection sheet 7 to thermally expand and contract in the
configuration.
[0517] According to the present invention, long holes 78 are
provided in the collar pieces 77 that are provided in the
peripheral portion of the display unit A and in the peripheral
portion of the support 8 so as not to affect the light reflection,
and therefore the light reflectance is not lowered by the long
holes 78, which solely work as holes for preventing the position
from shifting, and thus the light reflection sheet can have a
higher reflectance of light.
[0518] Though in the above-described embodiments the through hole
74 is provided at the center of the flat portion 71, this through
hole 74 may be provided in the flat portion 71 in such a location
as to be away from the center towards the periphery, and there are
no particular limitations in the positional relationship between
the through hole 74 and the long holes 75, 78.
[0519] Though in the above-described embodiments the holes for
preventing the position from shifting are long holes, the holes for
preventing the shifting may be in any form and not limited to long
holes as long as they can allow the light reflection sheet to
thermally expand and contract, and at the same time, engage with
the second position setting portions so as to prevent the position
of the light reflection sheet 7 from shifting towards the
periphery.
[0520] Though in the above-described embodiments the third shafts
20 for securing the light-emitting diode substrates 4 also work as
the second shafts 10 in the configuration, the first shafts 9, the
second shafts 10 and the third shafts 20 may be different shaft
members.
[0521] Though in the above-described embodiments the first shafts 9
are first position setting portions and the second shafts 10 are
second position setting portions, the first position setting
portions and the second position setting portions may be shaft
members mounted on the plate 81 or shaft members mounted on the
light-emitting diode substrates that are secured to the plate
81.
Embodiment 7
[0522] FIG. 100 is a cross sectional view showing main parts of a
structure of a light source device of an embodiment 7. FIG. 101 is
a plan view of a part of the light source device, FIG. 102 is a
plan view of the light source device with its part disassembled,
FIG. 103 is a plan view of a part of the light source device, FIG.
104 is a partially enlarged plan view of the light source device,
FIG. 105 is an enlarged perspective view of a connector, FIG. 106
is a plan view schematically showing a structure of the connector,
FIG. 107 is a plan view showing dimensional relationship of
insertion holes, FIG. 108 is a perspective view showing a
configuration of light-emitting diode substrates, onto which lenses
are attached, and FIG. 109 is a cross sectional view showing an
example of a fixture.
[0523] The light source device has a plurality of light-emitting
diodes 1 (B1) mounted on one surface 2a, and includes a plurality
of light-emitting diode substrates 2 (B3) that are juxtaposed apart
from one another; a plurality of lenses 3 (B2) that are provided on
the one surface 2a of the light-emitting diode substrate 2, oppose
to top portions of respective light-emitting diodes 1, and diffuse
light which the light-emitting diodes 1 emitted; a reflection sheet
4 (B5), mounted on the one surface 2a of the light-emitting diode
substrates 2 to reflect the light that the light-emitting diodes 1
emitted, including through holes 41 (B53), inside of which the
lenses 3 are arranged; a plurality of connectors 5 (B4) connecting
together adjacent light-emitting diode substrates 2, 2; and a
support body 6 (B6) that is positioned on the other surface 2b side
of the light-emitting diode substrates 2 and supports the plurality
of light-emitting diode substrates 2.
[0524] Each light-emitting diode substrate 2 (B3) has a circuit
unit on the one surface 2a, and configures a rectangular shape
(oblong shape) having larger ratio of length over width. On the one
surface 2a of each light-emitting diode board 2, the plurality of
light-emitting diodes 1 is arranged apart at a substantially
constant interval in a long direction. The light-emitting diode
substrate 2 is a single-sided board having a conductive unit only
on the one surface 2a side. The plurality of rectangular-shaped
light-emitting diode substrates 2 aligns their long direction in
the same direction, being spaced apart in the long direction and
the width direction, and is arranged parallel on one surface 6a of
the support body 6 having a rectangular shape. In FIG. 102, an
example is shown in which a light-emitting diode substrate 2 onto
which 6 pieces of the light-emitting diodes 1 are arranged is
provided at the center, and on both sides thereof, light-emitting
diode substrates 2 onto which 5 pieces of the light-emitting diodes
1 are arranged are provided, where 8 lines of this three pieces of
the light-emitting diode substrates 2 connected in a line are
juxtaposed with substantially the same interval as the mounting
intervals of the light-emitting diodes 1 on the light-emitting
diode substrates 2. Further, the light-emitting diodes 1 on all of
the light-emitting diode substrates 2 are two-dimensionally
arranged at substantially the same interval.
[0525] On both end portions of the light-emitting diode substrate 2
in the long direction of the one surface 2a, connecting portions
21, 22 (B31, B32) are provided. The three pieces of the
light-emitting diode substrates 2 juxtaposed in a line have the
connecting portions 21, 21 of the adjacent light-emitting diode
substrates 2 connected via connectors 5. Further, as will be
described later, the connecting portion 22 of the light-emitting
diode substrate 2 positioned on one end of the line is connected to
a power circuit board via a connector, and the connecting portion
22 of the light-emitting diode substrate 2 positioned on the other
end of the line is connected to a short connector.
[0526] Each connector 5 (B4) includes a plug 51 connected to one of
the connecting portions 21 and a receptacle 52 connected to the
other of the connecting portions 21, and is formed in a
substantially rectangular shape. A plurality of pin electrodes 52a
facing toward the long direction of the light-emitting diode
substrates 2 are formed in the receptacle 52, and a plurality of
metal fixtures 51a into which the respective pin electrodes 52a of
the receptacle 52 are to be inserted are formed in the plug 51. The
metal fixtures 51a of the plug 51 are connected to the one of the
connecting portions 21 by a solder reflow processing, and the pin
electrodes 52a of the receptacle 52 are connected to the other of
the connecting portions 21 by the solder reflow processing. By
attaching the plug 51 to the receptacle 52 and inserting each of
the pin electrodes 52a of the receptacle 52 into the respective
metal fixtures 51a of the plug 51, the adjacent two pieces of
light-emitting diode substrate 2 are electrically connected.
[0527] The lenses 3 (B2) oppose to the top portions of the
light-emitting diodes 1 apart therefrom, and each includes a
translucent portion 31 (B21) having a hemispheric recess for
diffusing the light that the light-emitting diodes 1 emitted to
every direction; and three positioning projections 32 (B22)
protruding toward the light-emitting diode substrate 2 from the
surface of the translucent portion 31 opposing the one surface 2a,
which position the lens 3 relative to the light-emitting diode
substrate 2; and tips of the positioning projections 32 are
attached to the one surface 2a by adhesives. The translucent
portion 31 is formed somewhat smaller than the through hole 41 of
the reflection sheet 4.
[0528] The reflection sheet 4 (B5) has high reflectivity, is formed
of a sheet of composite resin sheet having a substantially a
rectangular shape corresponding to the support body 6, has circular
shapes with a somewhat larger diameter than the translucent
portions 31 at positions corresponding to each lens 3, has through
holes 41 arranged in a matrix formation opened, and has second
through holes 42 having a substantially rectangular shape and into
which the connectors 5 can penetrate opened at portions
corresponding to the connectors 5.
[0529] The support body 6 (B6) is formed of a metal plate, includes
a plate portion 61 (B61) having a substantially rectangular flat
plate shape and a frame portion 62 (B62) along a periphery edge of
the plate portion 61, and supportingly houses the light-emitting
diode substrates 2 arranged in the long direction and the width
direction on the one surface 6a of the plate portion 61.
[0530] At the one end and the other end in the long direction of
each rectangular-shaped light-emitting diode substrate 2, insertion
holes 2c, 2d (B33, B34) for inserting the rivets 8 (B7) for causing
the support body 6 to support the light-emitting diode substrate 2
are opened. The dimension of the insertion hole 2c (B33), one of
the insertion holes 2c, 2d, is smaller than the dimension of the
insertion hole 2d (B34), the other of the insertion holes 2c, 2d.
Specifically, the one insertion hole 2c is a round hole with a
diameter of 2c1, and the other insertion hole 2d has its dimension
2d1 in the substrate width direction to be larger than the diameter
2c1 of the insertion hole 2c by a predetermined dimensional amount
(e.g. about 0.2 mm to 0.3 mm) and has an elongated round shape that
is elongated in the substrate long direction. Each light-emitting
diode substrate 2 is arranged such that the insertion hole 2c with
small diameter and the insertion hole 2d with large diameter are
next to each other at the ends where the light-emitting diode
substrates 2 are connected.
[0531] Through holes 61a (B64) corresponding to the positions of
the insertion holes 2c, 2d are formed on the plate portion 61 of
the support body 6, and the distance k between the centers of the
two insertion holes 2c, 2d equals the interval between two through
holes 61a corresponding to the respective insertion holes 2c, 2d.
That is, the positional relationship of the insertion holes 2c, 2d
of each light-emitting diode substrate 2 and the through hole 61a
is set so that when the light-emitting diode substrate 2 is aligned
onto the support body 6 by coinciding the hole positions of the
insertion hole 2c and the corresponding through hole 61a, the other
corresponding through hole 61a is positioned at the center of the
larger insertion hole 2d.
[0532] As shown in FIG. 109, each rivet 8 (B7) includes a
cylindrical part 81 (B71) having an outer diameter g1 that can be
inserted into the insertion holes 2c, 2d and the through holes 61a,
a flange portion 81a (B71a) that cannot be inserted into the
insertion holes 2c, 2d and the through holes 61a at its one end,
and an inner diameter g3 of the other end being smaller than an
inner diameter g2 of the one end; and a shaft part 82 (B72) that
can be inserted into the one end of the cylindrical part 81 and has
a shaft portion 82a having larger diameter than the inner diameter
g3 on the other end, and a head portion 82b (B82a) that cannot be
inserted into the insertion holes 2c, 2d and the through holes 61a.
The cylindrical part 81 and the shaft part 82 are formed of
composite resin material.
[0533] The reflection sheet 4 (B5) has third through holes 43 (B54)
having elongated hole shape and, a diameter larger than the
diameter of the head portion 82b of the shaft part 82, aligned
along with the through holes 41 opened at positions corresponding
to the rivets 8.
[0534] Next, a sequence for causing the support body 6 to support
the 3 pieces of light-emitting diode substrates 2 connected in a
line using the rivets 8 will be explained. Firstly, after having
positioned the insertion holes 2c, 2d of each light-emitting diode
substrate 2 and the respective through hole 61a of the support body
6, the cylindrical part 81 is inserted through the small diameter
insertion hole 2c and the through hole 61a from the one surface 2a
side of each light-emitting diode substrate 2, and the flange
portion 81a is caused to make contact with the one surface 2a of
the light-emitting diode substrate 2. Next, when the shaft portion
82a of the shaft part 82 is inserted until when the head portion
82b makes contact with the flange portion 81a of the cylindrical
part 81, a distal end portion of the cylindrical part 81 is
expanded outward by the shaft portion 82a of the shaft part 82. The
distal end portion of the cylindrical part 81 expanded outward
retains the shaft portion 82a of the shaft part 82 by pressing
inwardly, and cannot be inserted through the through holes 61a of
the support body 6; thereby each light-emitting diode substrate 2
is fixed to the support body 6 by the rivet 8.
[0535] After having attached the rivets 8 for the small diameter
insertion holes 2c as above, the rivets 8 are similarly attached
for the large diameter insertion holes 2d, thereby each
light-emitting diode substrate 2 is fixed to the support body 6 by
the rivets 8. At this occasion, if the positions of both substrates
are displaced from their appropriate positions during the
connection of the adjacent light-emitting diode substrates 2 by the
connector 5, the through holes 61a of the support body 6 do not
come to the centers of the insertion holes 2d; however, since the
dimension of the insertion holes 2d in the width direction of the
substrate is made large, the through holes 61a do not fall out of
the range of the insertion holes 2d; and the rivets 8 can be
attached by inserting through the insertion holes 2d and the
through holes 61a.
[0536] After having attached the rivets 8 for all of the insertion
holes 2c, 2d of the light-emitting diode substrates 2, the
reflection sheet 4 is mounted by being opposed to the
light-emitting diode substrates 2 in a state where the lenses 3 are
inserted through the through holes 41, the connectors 5 are
inserted through the second through holes 42, and the respective
rivets 8 are inserted through the third through holes 43.
[0537] FIG. 110 is a cross sectional view showing a configuration
of a display device including the light source device of the
present invention. The display device includes a display screen
face 72a on the front side; a display unit 70 (A) having a
substantially rectangular parallelepiped shape; a light source
device A (B) arranged behind the display unit 70; and a cabinet 71
(D) hiding a periphery edge portion of the display unit 70 and the
rear side of the light source device A.
[0538] The display unit 70 includes a display panel 72 (A1) having
the display surface 72a, and an optical sheet 73 (C) arranged
behind the display panel 72. The periphery edge portion of the
display panel 72 is fixedly retained at its front and rear between
a front retaining frame 74 (A2) and a rear retaining frame 75 (A3),
configuring a panel module, and the rear retaining frame 75 is
attached to the periphery edge portion of the support body 6.
[0539] The optical sheet 73 is a laminate body in which a
relatively thick diffusion plate that diffuses the light emitted by
the light-emitting diodes 1 as the light source, and a relatively
thin composite resin sheet such as a reflective polarizing plate, a
prism sheet, a diffusion sheet, etc. are laminated. The periphery
edge portion of the optical sheet 73 is fixedly retained between
the frame portion 62 of the support body 6 and the rear retaining
frame 75.
[0540] The cabinet 71 (D) includes a cabinet front divided unit 71a
(D1) that hides the front side of the periphery edge portion of the
display unit 70, and a cabinet rear divided unit 71b (D2) having a
basin shape that hides the periphery edge portion and the rear side
of the light source device A, and is attached to the frame portion
62 of the support body 6 by a male screw.
[0541] Notably, although a depiction thereof is omitted, the power
circuit board that is to be connected to a connector electrode 22
of the light-emitting diode board 2 by the second connector (B41)
is attached at one side portion in the long direction of the other
surface 6b of the plate portion 61. On the other side portion in
the long direction, a control circuit board that performs driving
and control of the display unit is attached. Further, at the center
portion in the long direction of the other surface of the plate
portion 61, a signal process circuit board that processes image
signals to be displayed on the display screen face of the display
unit is attached.
[0542] In the embodiment 7 above, the fixture is configured of the
rivet 8 formed of two components: the cylindrical part 81 and the
shaft part 82, however, the fixture may be a rivet formed of a
single component; further, aside from the rivet, it may be
configured of a screw, a bolt and a nut, etc.
[0543] Further, in the embodiment 7 above, it is configured such
that, with the third through hole 43 having larger diameter than
the diameter of the head portion 82b of the rivet 8 being provided
and the head portion 82b being arranged inside the third through
hole 43, the expansion and contraction of the reflection sheet 4
caused by thermal expansion is allowed, however, as an alternative
of this, the diameter of the head portion 82b may be larger than
the third through hole 43, the outer periphery portion of the head
portion 82b may oppose to the circumference of the third through
hole 43 in the thickness direction while being apart therefrom, and
the head portion 82b may prevent the reflection sheet 4 from being
lateralized toward the direction of recessing from the
light-emitting diode substrates 2.
[0544] In the embodiment 7 above, the two insertion holes 2c, 2d
are formed at the respective ends in the long direction of the
rectangular-shaped light-emitting diode substrate 2, however, as
are exemplified in FIG. 111A, FIG. 111B, three or more insertion
holes 2c, 2d may be formed at a plurality of positions on the
light-emitting diode substrate 2 in the long direction. FIG. 111A
shows an example in which the insertion hole 2c with small
dimension is formed not at the ends in the long direction but at an
inner position of the light-emitting diode substrate 2, and the
insertion holes 2d with large dimension being formed at the
respective ends in the long direction; FIG. 111B shows an example
in which the insertion hole 2c with small dimension is formed not
at the ends in the long direction but at an inner position of the
light-emitting diode substrate 2, and the insertion holes 2d with
large dimension being formed at three positions including the
respective ends in the long direction. Notably, although a
depiction thereof is omitted, through holes with larger diameter
than the diameter of the head portion 82b of the shaft part 82 of
the rivet 8 are opened on the reflection sheet 4 corresponding to
the positions of the respective insertion holes 2c, 2d. In the
present embodiment, in connecting a plurality of rectangular
light-emitting diode substrates 2 in a line, the end portions of
the light-emitting diode substrates 2 having the insertion holes 2d
with larger dimension are arranged to be adjacent to one another;
thereby the positional displacement of the light-emitting diode
substrates 2 caused by connections using the connector can more
surely be absorbed.
[0545] In the embodiment 7 above, the light source device of the
present invention is adapted for illumination in the display panel
in a liquid crystal display device, however, it may be adapted for
illumination in a display panel in a display device with other
light-emission schemes other than the liquid crystal display
device.
Embodiment 8
[0546] FIG. 112 is a cross sectional view showing main parts of a
structure of a light source device of the embodiment 8, FIG. 113 is
a plan view of a part of the light source device, FIG. 114 is a
plan view of the light source device with its part disassembled,
FIG. 115 is a plan view of a part of the light source device, FIG.
116 is a partially enlarged plan view of the light source device,
FIG. 117 is a perspective view showing a configuration of
light-emitting diode substrates, onto which lenses are attached,
FIG. 118 is a cross sectional view showing a structure of rivets,
FIG. 119 is a plan view along a line V-V in FIG. 118, and FIG. 120
is a cross sectional view of a positional relationship of the
rivets and the lenses.
[0547] The light source device has a plurality of light-emitting
diodes 1 (B1) mounted on one surface 2a, and includes a plurality
of light-emitting diode substrates 2 (B3) that are juxtaposed apart
from one another; a plurality of lenses 3 (B2) that are provided on
the one surface 2a of the light-emitting diode board 2, opposes to
top portions of respective light-emitting diodes 1, and diffuses
light which the light-emitting diodes 1 emit; a reflection sheet 4
(B5), mounted on the one surface 2a of the light-emitting diode
substrates 2 to reflect the light that the light-emitting diodes 1
emit, including through holes 41 (B53), inside of which the lenses
3 are arranged; and a support body 6 (B6) that is positioned on the
other surface 2b side of the light-emitting diode substrates 2 and
supports the plurality of light-emitting diode substrates 2.
[0548] Each light-emitting diode substrate 2 (B3) has a circuit
unit on the one surface 2a, and configures a rectangular shape
(oblong shape) having larger ratio of length over width. On the one
surface 2a of each light-emitting diode substrate 2, the plurality
of light-emitting diodes 1 are arranged apart at a substantially
constant interval in a long direction. The light-emitting diode
substrate 2 is a single-sided board having a conductive unit only
on the one surface 2a side. The plurality of rectangular-shaped
light-emitting diode substrates 2 align their long direction in the
same direction, being spaced apart in the long direction and the
width direction, and are arranged parallel on a one surface 6a of
the support body 6 having a rectangular shape. In FIG. 114, an
example is shown in which a light-emitting diode substrate 2 onto
which 6 pieces of the light-emitting diodes 1 are arranged is
provided at the center, and on both sides thereof, light-emitting
diode substrates 2 onto which 5 pieces of the light-emitting diodes
1 are arranged are provided, where 8 lines of this three pieces of
the light-emitting diode substrates 2 connected in a line are
juxtaposed with substantially the same interval as the mounting
intervals of the light-emitting diodes 1 on the light-emitting
diode substrates 2. Further, the light-emitting diodes 1 on all of
the light-emitting diode substrates 2 are two-dimensionally
arranged at substantially the same interval.
[0549] On both end portions of the light-emitting diode substrate 2
in the long direction of the one surface 2a, connecting portions
21,22 (B31, B32) are provided. The three pieces of the
light-emitting diode substrates 2 juxtaposed in a line have the
connecting portions 21, 21 of the adjacent light-emitting diode
substrates 2 connected via connectors 5 (B4). Further, as will be
described later, the connecting portion 22 of the light-emitting
diode substrate 2 positioned on one end of the line is connected to
a power circuit board via a connector, and the connecting portion
22 of the light-emitting diode substrate 2 positioned on the other
end of the row is connected to a short connector.
[0550] The lenses 3 (B2) are arranged apart from the one surface 2a
of the light-emitting diode substrates 2 and oppose to the top
portions of the light-emitting diodes 1 apart therefrom, and each
includes a translucent portion 31 (B21) having a hemispheric recess
31a for diffusing the light that the light-emitting diodes 1 emit
to every direction; and three positioning projections 32 protruding
toward the light-emitting diode substrate 2 from a surface 31b of
the translucent portion 31 opposing the one surface 2a of the
light-emitting diode substrates 2, which position the lens 3
relative to the light-emitting diode substrate 2; and tips of the
positioning projections 32 are attached to the one surface 2a of
the light-emitting diode substrates 2 by adhesives.
[0551] The reflection sheet 4 (B5) has high reflectivity, is formed
of a sheet of composite resin sheet having a substantially a
rectangular shape corresponding to the support body 6, has a
circular shape with a somewhat larger diameter than the translucent
portion 31 at position corresponding to each lens 3, has through
holes 41 arranged in a matrix formation opened, and has second
through holes 42 having a substantially rectangular shape and into
which the connectors 5 can penetrate opened at portions
corresponding to the connectors 5. The through holes 41 are formed
somewhat larger than the translucent portions 31 of the lenses
3.
[0552] The support body 6 (B6) is formed of a metal plate, includes
a plate portion 61 (B61) having a substantially rectangular flat
plate shape and a frame portion 62 (B62) along a periphery edge of
the frame portion 61, and supportingly houses the light-emitting
diode substrates 2 arranged in the long direction and the width
direction on the one surface 6a of the plate portion 61.
[0553] At the one end and the other end in the long direction of
each rectangular-shaped light-emitting diode substrate 2, insertion
holes 2c, 2d (B33, B34) for inserting the rivets 8 (B7) for causing
the support body 6 to support the light-emitting diode substrate 2
are opened. The insertion hole 2c (B33), one of the two insertion
holes 2c, 2d, is a round hole, whereas the insertion hole 2d (B34),
the other of the insertion holes 2c, 2d, has an elongated round
shape that is elongated in the substrate long direction. Through
holes 61a (B64) corresponding to the positions of the respective
insertion holes 2c, 2d are formed on the plate portion 61 of the
support body 6.
[0554] Each rivet 8 (B7) includes a cylindrical part 81 (B71)
having an outer diameter g1 that can be inserted into the insertion
holes 2c, 2d of the light-emitting diode substrate 2 and the
through holes 61a of the support body 6, a flange portion 81a
(B71a) that cannot be inserted into the insertion holes 2c, 2d and
the through holes 61a at its one end, and an inner diameter g3 of
the other end being smaller than an inner diameter g2 of the one
end; and a shaft part 82 (B72) that can be inserted into the one
end of the cylindrical part 81 and has larger diameter than the
inner diameter g3 on the other end, and at one end of the shaft
part 82, a head portion 82a (B72a) that cannot penetrate through
the through holes 2c, 2d and the through holes 61a is formed. The
head portion 82a has a round plate shape having an annular convex
portion that convexes on its outer periphery side on the shaft part
82 side. The cylindrical part 81 and the shaft part 82 are formed
of composite resin material.
[0555] The head portion 82a of the rivet 8 has a plurality of
grooves 82b (B74) opened to the outer periphery portion formed on a
side opposing the one surface 2a of the light-emitting diode
substrate 2. Specifically, the annular convex portion is configured
such that three radial grooves 82b having their center at a center
side position 82 of the head portion 82a where the shaft part 82 is
connected are formed at substantially 120 degrees to one another.
Each groove 82b has a predetermined width.
[0556] A bottom portion of each groove 82b is positioned on the one
surface 2a side of the light-emitting diode substrate 2 than a
position of an outer periphery side end portion of an opposing
surface 31b of the translucent portion 31 of the lens 3 opposed to
the one surface 2a of the light-emitting diode board 2. FIG. 120
shows an example in which the bottom portion of the groove 82b is
offset from the position of the outer periphery side end portion of
the opposing surface 31b of the translucent portion 31 toward the
one surface 2a side by a distance k. Due to this, the light emitted
from the outer periphery of the translucent portion 31 is not
incident to the inside of the groove 82b, but is reflected on an
outer surface of the head portion 82a of the rivet 8, or is
penetrated without being reflected, in either case becomes an
illumination.
[0557] The reflection sheet 4 has third through holes 43 (B54)
having elongated hole shape and, a diameter larger than the
diameter of the head portion 82b, aligned along with the second
through holes 42 opened at positions corresponding to the rivets
8.
[0558] Next, a sequence for causing the support body 6 to support
the 3 pieces of light-emitting diode substrates 2 connected in a
line using the rivets 8 will be explained. Firstly, after having
positioned the insertion holes 2c, 2d of each light-emitting diode
substrate 2 and the respective through hole 61a of the support body
6, the cylindrical part 81 is inserted through the insertion hole
2c and the through hole 61a from the one surface 2a side of each
light-emitting diode substrate 2, and the flange portion 81a is
caused to make contact with the one surface 2a of the
light-emitting diode substrate 2. Next, when the shaft part 82 is
inserted until when the head portion 82a makes contact with the
flange portion 81a of the cylindrical part 81, a distal end portion
of the cylindrical part 81 is expanded outward by the distal end
portion of the shaft part 82. The distal end portion of the
cylindrical part 81 expanded outward retains the distal end portion
of the shaft part 82 by pressing inwardly, and the head portion 82a
cannot be inserted through the through holes 61a of the support
body 6; thereby each light-emitting diode substrate 2 is fixed to
the support body 6 by the rivet 8. After having attached the rivets
8 for the round insertion holes 2c as above, the rivets 8 are
similarly attached for the elongated insertion holes 2d, thereby
each light-emitting diode substrate 2 is fixed to the support body
6 by the rivets 8.
[0559] After having attached the rivets 8 for all of the insertion
holes 2c, 2d, the reflection sheet 4 is mounted by being opposed to
the light-emitting diode substrates 2 in a state where the lenses 3
are inserted through the through holes 41, the connectors 5 are
inserted through the second through holes 42, and the respective
rivets 8 are inserted through the third through holes 43, thereby
completing the light source device.
[0560] Next, a sequence for releasing the state in which the
respective light-emitting diode substrates 2 are fixed to the
support body 6 by the rivets 8 will be explained. For example, as
shown in FIG. 116, of the three grooves 82b formed on the head
portion 82a, since one groove 82b is positioned on a side adjacent
to the lens 3, a screwdriver cannot be inserted into the groove 82b
for the lens 3 which becomes an obstacle. However, as to the two
grooves 82b maintaining 120 degrees relative to the groove 82b, the
lens 3 will not be an obstacle, so the screwdriver can be inserted
into one of the grooves 82b, and when the head portion 82a is
compulsorily moved to the side recessing from the light-emitting
diode substrate 2, the distal end portion of the cylindrical part
81 that had been expanded outward returns to its original diameter,
penetrating the through holes 61a of the support body 6 and the
through holes 2c, 2d of the light-emitting diode substrate 2,
thereby the fixed state of the light-emitting diode substrate 2 and
the support body 6 is released.
[0561] FIG. 121 is a cross sectional view showing a configuration
of a display device including the light source device of the
embodiment 8. The display device includes a display screen face 72a
on the front side; a display unit 70 (A) having a substantially
rectangular parallelepiped shape; a light source device A (B)
arranged behind the display unit 70; and a cabinet 71 (D) hiding a
periphery edge portion of the display unit 70 and the rear side of
the light source device A.
[0562] The display unit 70 includes a display panel 72 (A1) having
the display surface 72a, and an optical sheet 73 (C) arranged
behind the display panel 72. The periphery edge portion of the
display panel 72 is fixedly retained at its front and rear between
a front retaining frame 74 (A2) and a rear retaining frame 75 (A3),
configuring a panel module, and the rear retaining frame 75 is
attached to the periphery edge portion of the support body 6.
[0563] The optical sheet 73 is a laminate body in which a
relatively thick diffusion plate that diffuses the light emitted by
the light-emitting diodes 1 as the light source, and a relatively
thin composite resin sheet such as a reflective polarizing plate, a
prism sheet, a diffusion sheet, etc. are laminated. The periphery
edge portion of the optical sheet 73 is fixedly retained between
the frame portion 62 of the support body 6 and the rear retaining
frame 75.
[0564] The cabinet 71 (D) includes a cabinet front divided unit 71a
(D1) that hides the front side of the periphery edge portion of the
display unit 70, and a cabinet rear divided unit 71b (D2) having a
basin shape that hides the periphery edge portion and the rear side
of the light source device A, and is attached to the frame portion
62 of the support body 6 by a male screw.
[0565] Notably, although a depiction thereof is omitted, the power
circuit board that is to be connected to a connector electrode 22
of the light-emitting diode substrate 2 by the second connector
(B41) is attached at one side portion in the long direction of the
other surface 6b of the plate portion 61. On the other side portion
in the long direction, a control circuit board that performs
driving and control of the display unit is attached. Further, at
the center portion in the long direction of the other surface 6b of
the plate portion 61, a signal process circuit board that processes
image signals to be displayed on the display screen face of the
display unit is attached.
[0566] Next, another embodiment of the rivets 8 will be explained.
FIG. 122 is a plan view showing a rear face side of a head portion
of a rivet in a variant light source device of the embodiment 8,
FIG. 123 is a partially enlarged plan view of the another light
source device. In this another embodiment, the annular convex
portion of the head portion 82a of the rivet 8 (B7) includes two
radial grooves 82c having their center at a center side position 82
of the head portion 82a where the shaft part 82 is connected are
formed at substantially 90 degrees to one another. As shown in FIG.
123, one of the two grooves 82c (B74) is positioned on a side
adjacent to the lens 3, so even in the case where a screwdriver
cannot be inserted into the lens 3 (B2) being an obstacle, the lens
3 will not be an obstacle for the other of the grooves 82c, and the
screwdriver can be inserted thereinto.
[0567] Next, another, second embodiment of the rivets 8 will be
explained. FIG. 124 is a plan view showing a rear face side of a
head portion of a rivet in a second another light source device of
the embodiment 8. In this another, second embodiment, the annular
convex portion of the head portion 82a of the rivet 8 (B7) includes
two radial grooves 82d having their center at a center side
position 82 of the head portion 82a where the shaft part 82 is
connected are formed at substantially 60 degrees to one another.
Similar to the above another embodiment, one of the two grooves 82d
is positioned on a side adjacent to the lens 3, so even in the case
where a screwdriver cannot be inserted, the screwdriver can be
inserted into the other groove 82d. Note that, as for the angle
between the plurality of grooves, any given angle other than 120
degrees, 90 degrees, and 60 degrees may be employed. In such cases,
in order to avoid a state in which the screwdriver cannot be
inserted into the plurality of grooves at an instant, of the
plurality of grooves, at least one needs to be positioned off of a
straight line that connects the center side position of the head
portion 82a where the shaft portion 82 is connected and the other
groove.
[0568] In the embodiment 8 above, it is configured such that, with
the third through hole 43 having larger diameter than the diameter
of the head portion 82a of the rivet 8 being provided and the head
portion 82a being arranged inside the third through hole 43, the
expansion and contraction of the reflection sheet 4 caused by
thermal expansion is allowed, however, as an alternative of this,
the diameter of the head portion 82a may be larger than the third
through hole 43, the outer periphery portion of the head portion
82a may oppose to the circumference of the third through hole 43 in
the thickness direction while being apart therefrom, and the head
portion 82b may prevent the reflection sheet 4 from being
lateralized toward the direction of recessing from the
light-emitting diode substrates 2.
[0569] Further, in the embodiment 8 above, the light source device
of the present invention is adapted for illumination in the display
panel in a liquid crystal display device, however, it may be
adapted for illumination in a display panel in a display device
with other light-emission schemes other than the liquid crystal
display device.
Embodiment 9
[0570] FIG. 125 is a vertical cross sectional view showing a
partial configuration of a display device 7 including a light
source device 1 of an embodiment of the present invention. The left
and right direction in FIG. 125 is equivalent to the front and rear
direction of the display device 7, more specifically the light
source device 1.
[0571] FIG. 126 and FIG. 127A are horizontal cross sectional view
showing a configuration of a connecting portion of circuit boards
2, 2 that the light source device 1 includes and a front view
thereof, and FIG. 127B is a front view showing a relationship of
the circuit boards 2, 2 and attachment members 6 that the light
source device 1 includes. The up and down direction in FIG. 126 is
equivalent to the front and rear direction of the display device 7,
more specifically the light source device 1 (B). Further, FIG. 126
corresponds to a cross sectional view along a line VI-VI in FIG.
127A.
[0572] FIG. 128 is a plan view schematically showing a state in
which the circuit boards 2, 2, . . . are arranged in parallel, and
showing a state before a reflection sheet 4 is attached to the
attachment member 6.
[0573] As shown in FIG. 125, the display device 7 includes a
display unit 70 (A); a cabinet 71 (D); a front side frame 72 (A2)
and a rear side frame 73 (A3); and a light source device 1 (B).
[0574] Hereinafter, firstly, the configuration of the light source
device 1 will be explained.
[0575] As shown in FIG. 125 to FIG. 128, the light source device 1
(B) includes a plurality pieces of circuit boards 2, 2, . . . (B3);
a reflection sheet 4 (B5); and an attachment member 6 (B6).
[0576] Each circuit board 2 (B3) is formed in a rectangular plate
shape that extends in the left and right direction, has a first
connecting portion (e.g. a male connecting portion) 21 mounted on a
right end portion of a front face 2a, and a second connecting
portion (e.g. a female connecting portion) 22 mounted on a left end
portion of the front face 2a. That is, a off direction of the first
and second connecting portions 21, 22 is the left and right
direction.
[0577] Further, on an upper face 2a between the first and second
connecting portions 21, 22 (B31, B32) of the circuit board 2, a
plurality (5 pieces in FIG. 128) of light-emitting units 23, 23, .
. . (B1) is mounted thereon by being appropriately apart in the
long direction.
[0578] Further, a driver (not shown) for driving the light-emitting
units 23, 23, . . . is mounted on the circuit board 2.
[0579] Here, each light-emitting unit 23 (B1) includes a
light-emitting diode.
[0580] Moreover, on the front face 2a of each circuit board 2, a
plurality of lenses 24, 24, . . . (B2) each corresponding to the
respective light-emitting units 23, 23, . . . is provided. Each
lens 24 is formed in a circular shape, and is arranged to oppose to
a top portion of the light-emitting unit 23. The lens 24 diffuses
the light emitted by the light-emitting unit 23.
[0581] The attachment member 6 (B6) is rectangular plate shaped,
formed of a metal plate, and includes a flat plate portion 61 (B61)
having a rectangular flat plate shape; and a frame portion 62 (B62)
connecting to a peripheral edge of the flat plate portion 61. The
long direction (or the short direction) is equivalent to the left
and right direction (or the up and down direction).
[0582] On a front face 6a of the flat plate portion 61, the circuit
boards 2, 2, . . . are mounted in a state of being juxtaposed in a
matrix formation. As a result, the light-emitting units 23, 23, . .
. (B1) are arranged in the matrix formation. FIG. 128 shows an
example of a state in which the circuit boards 2, 2, . . . are
arranged by 2 in the left and right direction and 5 in the up and
down direction.
[0583] Further, at a back face left end portion of the attachment
member 6, a power circuit board (B10a) (not shown) for supplying
power to drivers of the respective circuit boards 2, 2, . . . is
attached. Further, at a back face right end portion of the
attachment member 6, a control circuit board for executing drive
and control of the display unit 70 is attached.
[0584] In the circuit boards 2, 2, . . . that are adjacent in the
left and right direction, the first connecting portion 21 of the
circuit board 2 arranged on the left side and the second connecting
portion 22 of the circuit board 2 arranged on the right side are
electrically connected via a first connector 25 (B4) for bridging
the first and second connecting portions 21, 22.
[0585] Further, each of the second connecting portions 22, 22, . .
. of the circuit boards 2, 2, . . . arranged on the leftmost side
in the flat plate portion 61 is electrically connected to the power
circuit board via a second connector (B41) (not shown).
[0586] Moreover, each of the second connecting portions 22, 22, . .
. of the circuit boards 2, 2, . . . arranged on the rightmost side
in the flat plate portion 61 is electrically connected to a short
connector.
[0587] The reflection sheet 4 (B5) is formed of a composite resin
sheet, and at least a front face of the reflection sheet 4 has high
reflectivity in order to reflect the light emitted by the
light-emitting units 23, 23, . . . . Further, the reflection sheet
4 is formed of a rectangular shape corresponding to the shape of
the attachment member 6, and is attached on the front face side of
the attachment member 6.
[0588] On the reflection sheet 4, at positions corresponding to the
arranged positions of the lenses 24, 24, . . . , circular-shaped
through holes 41, 41, . . . (B53) are formed. Further, on the
reflection sheet 4, at positions corresponding to the arranged
positions of first connectors 25, 25, . . . , rectangular-shaped
through holes 42, 42, . . . are formed.
[0589] The reflection sheet 4 is laminated on the respective front
faces 2a, 2a, . . . of the circuit boards 2, 2, . . . in a state in
which the lenses 24, 24, . . . are arranged inside the through
holes 41, 41, . . . and the first connectors 25, 25, . . . are
arranged inside the through holes 42, 42, . . . .
[0590] Next, the configuration of the display device 7 shown in
FIG. 125 will be explained. The light source device 1 (B) is
arranged on a back face side of the display unit 70 so as to
illuminate the display unit 70 (A).
[0591] The display unit 70 has a rectangular shape, and includes a
display panel 701 (A1) and an optical sheet 702 (C).
[0592] The display panel 701 is e.g. a liquid crystal display
panel, and a front surface of the display panel 701 configures a
display surface 7a for displaying images.
[0593] The optical sheet 702 is arranged opposing to the back face
of the display panel 701 and in between the display panel 701 and
the lenses 24, 24, . . . , and diffuses the light emitted by the
light-emitting units 23, 23, . . . . The optical sheet 702 is a
laminated body in which a relatively thick diffusion plate, and a
relatively thin composite resin sheet configured with a reflective
polarizing plate, a prism sheet, or a diffusion sheet, etc. are
laminated.
[0594] The display panel 701 configures a panel module by the
peripheral edge portion of the display panel 701 being fixedly
retained at its front and rear by the front side frame 72 and the
rear side frame 73.
[0595] The rear side frame 73 is attached to the frame portion 62
of the attachment member 6, and the optical sheet 702 is fixedly
retained by the rear side frame 73 and the frame portion 62 at the
front and rear.
[0596] The cabinet 71 (D) houses the panel module, the optical
sheet 702, and the light-emitting element 1 in a state where the
display surface 7a is exposed from a front face opening and
remainders other than the display surface 7a are hidden.
[0597] At the center portion in the left and right direction at the
back face of the flat plate portion 61 of the attachment member 6
(B6), the signal process circuit board for processing image signals
to be displayed on the display surface of the display panel 701 is
attached.
[0598] In manufacturing the light source device 1 of the display
device 7 as aforementioned, the manufacturer attaches the circuit
boards 2, 2, . . . (B3) to the flat plate portion 61 (B61) of the
attachment member 6 (B6). In attaching each circuit board 2, marks
31, 32, 33 (B38, B35) as shown in FIG. 126 to FIG. 128 are formed
on each circuit board 2 so that the manufacturer can easily and
accurately recognize the orientation in the left and right
(hereafter referred to simply as orientation of the circuit boards
2).
[0599] The marks 31, 32, 33 are each recess shaped and show the
orientation of the circuit board 2.
[0600] The marks 31, 32 (B38) are arranged in the vicinity of the
first connecting portion 21. The mark 31 is a rectangular-shaped
notched portion that penetrates from the front face 2a of the
circuit board 2 to its back face at the upper end portion of the
circuit board 2. Similarly, the mark 32 is a rectangular-shaped
notched portion at the lower end portion of the circuit board
2.
[0601] The mark 33 (B35) is arranged in the vicinity of the second
connecting portion 22. The mark 33 is a round-shaped hole that
penetrates from the front face 2a of the circuit board 2 to its
back face at the center portion in the up and down direction.
[0602] The inner diameter of the mark 33 is larger than the inner
size of the marks 31, 32.
[0603] The marks 31, 32 and mark 33 as aforementioned are formed
respectively at the right end portion and the left end portion (in
other words, one end and the other end in the left and right
direction in the circuit board 2) with different number of pieces,
dimension, and shape.
[0604] Due to this, the operator can easily and accurately
recognize that the side where the marks 31, 32 are formed in the
circuit board 2 is the right side, and the side where the mark 33
is formed in the circuit board 2 is the left side
[0605] Notably, the marks 31, 32 and mark 33 may have the same
dimension and/or shape. Further, in the case where the dimension
and/or shape are different, the number of pieces of the marks
formed on the right side and the number of pieces of the marks
formed on the left side of the circuit board 2 may be the same.
[0606] On the other hand, at respective attaching positions on the
attachment member 6 (B6) for the circuit board 2, indexes 51, 52,
53 (B69b, B68) are formed thereon.
[0607] The indexes 51, 52, 53 are each convex shaped and show the
attaching positions of the circuit board 2, each of which are
protrudingly formed on the front face 6a of the flat plate portion
61. The indexes 51, 52, 53 may be integrally formed with the flat
plate portion 61, and may alternatively be configured by a member
that is separate from the attachment member 6 being fixed to the
front face 6a.
[0608] The indexes 51, 52 (B69b) are arranged in the vicinity of
the arranged position of the first connecting portion 21. The index
53 is arranged in the vicinity of the arranged position of the
second connecting portion 22. The distances between the indexes 51,
52, 53 correspond to the distances between the marks 31, 32,
33.
[0609] The index 51 (or the index 52) is formed in a square
columnar shape, and engages with the mark 31 (or the mark 32) by
being fitted therein. The index 53 is formed in a round columnar
shape, and engages with the mark 33 by being fitted therein. That
is, the indexes 51, 52, 53 have the number of pieces, dimension and
shape corresponding to the marks 31, 32, 33 to which they are to be
engaged.
[0610] By seeing the marks 31, 32, 33 and contacting fingers to the
marks 31, 32, 33, the operator can be prevented from an erroneous
judgment in the orientation of the circuit board 2. Further, by
seeing the indexes 51, 52, 53 directly or through the marks 31, 32,
33 and by contacting fingers or the circuit board 2 to the marks
31, 32, 33, the attaching position of the circuit board 2 can
easily and accurately recognized.
[0611] Further, the operator can position the circuit board 2
easily and accurately, yet further uniquely by contacting the
circuit board 2 to the attachment member 6 such that the indexes
51, 52, 53 are fitted into the marks 31, 32, 33.
[0612] Accordingly, the operator can attach the circuit board 2
having been arranged in the correct orientation at the correct
position onto the attachment member 6. In this case, the operator
fixes the circuit board 2 onto the flat plate portion 61 e.g. by
using a plurality of rivets (B7) (not shown).
[0613] At this occasion, the circuit board 2 is prevented from
erroneously being attached with its left and right wrong. This is
because the number of pieces, dimension and shape of the marks 31,
32, 33 and the indexes 51, 52, 53 differ in the left side and the
right side of the circuit board 2.
[0614] In a case where the mark 33 and the index 53 are not formed,
the marks 31, 32 may be regarded as showing the orientation of the
circuit board 2 by making the outer periphery shape of the circuit
board 2 differ in the right end portion and the left end portion.
In this case, the operator can judge easily and accurately that the
side of the circuit board 2 onto which the marks 31, 32 are formed
is the right side, and the side of the circuit board 2 onto which
the marks 31, 32 are not formed is the left side.
[0615] Further, the operator can position the circuit board 2
easily and accurately, yet further uniquely by contacting the
circuit board 2 to the flat plate portion 61 such that the indexes
51, 52 are fitted into the marks 31, 32.
[0616] The present embodiment 9 exemplifies a configuration in
which a plurality of marks and an equaling number of indexes are
formed in the circuit board 2 and the attachment member 6, however,
it is not limited to this. For example, the configuration may be
that in which one of the marks 31, 32, 33 and one of the
corresponding indexes 51, 52, 53 are formed. In this case also, the
orientation of the circuit board 2 can be judged easily and
accurately, and the circuit board 2 can be positioned.
[0617] The marks formed on the circuit board 2 may be configured to
be used only for the confirmation of the orientation of the circuit
board 2 and not to be used for the positioning. In this case, the
indexes corresponding to the marks do not have to be formed on the
attachment member 6. Further, the marks may have a convex shape.
Alternatively, the marks may be configured such that a corner
portion of the right end portion of the circuit board 2 is formed
in a right-angled shape whereas a corner portion of the left end
portion of the circuit board 2 is formed in an arc shape; or, the
marks may be configured such that concavo-convex pattern is formed
on the right end face of the circuit board 2 whereas the left end
face is formed smoothly, etc.
[0618] The manufacturing operation of the light source device 1 as
aforementioned, further regarding the manufacturing operation of
the display device 7 has an improved efficiency in the attaching
operation of the circuit boards 2, 2, . . . .
[0619] Incidentally, the positioning of the circuit board 2 is also
possible by printing a mark for positioning on each of the circuit
board 2 and the attachment member 6. However, in this case, when
the mark printed on the attachment member 6 is hidden by the
circuit board 2 that is to be attached, it is required to confirm
the presence or absence of the mark printed on the attachment
member 6 and/or the printed position, etc. by retreating the
circuit board 2 from the attaching position all of the time.
[0620] That is, it is advantageous for improving the operation
efficiency to form the convex-shaped indexes 51, 52, 53 on the
attachment member 6 by which the presence or absence and/or the
formed position is easier to be recognized by the sense of
touch.
[0621] Generally, the colors of the circuit board 2, the attachment
member 6 and the first connector 25, etc. are respectively a color
that reflects the light emitted by the light-emitting units 23, 23,
. . . (e.g. white), or that is difficult to absorb the same (e.g.
cream).
[0622] The peripheral portions of the marks 31, 32, 33 and the
indexes 51, 52, 53 in the present embodiment are the same color as
the circuit boards 2 and the attachment member 6, however, for the
purpose of improving the visibility thereof, the colors of the
peripheral portions of the marks 31, 32, 33 and/or the tip ends of
the indexes 51, 52, 53 may be a different color from the color of
the circuit boards 2 and the attachment member 6. It should be
noted that this color is limited to colors that reflect the light
emitted by the light-emitting units 23, 23, . . . , or that is
difficult to absorb the same. Notably, in the case where the marks
31, 32, 33 and the indexes 51, 52, 53 are arranged at positions
that will be hidden by the reflection sheet 4, a limitation to the
colors will not be needed.
[0623] Further, in the embodiment 9, the circuit boards 2, 2, . . .
are juxtaposed at an equaling interval in a plurality of rows,
however, aside from this, the circuit boards 2, 2, . . . may be
arranged such that a offset dimension on the center side of a
juxtaposing direction is short, and the offset dimension on the
both sides of the juxtaposing direction is long.
[0624] The embodiment 9 disclosed herein is an example in its all
aspects, and should not be regarded as being restrictive. The scope
of the present invention does not mean as above, and is intended to
include meanings equivalent to the scope of the claims, and all of
the modifications made within the scope of the claims. For example,
the orientation of the circuit board 2 is not limited to the
orientation in the left and right direction, and may be an
orientation in the up and down direction. That is, the first and
second connecting portions 21, 22 may be configured to be arranged
apart in the up and down direction.
[0625] Further, in so far as to the effect of the present
invention, the light source device 1 or the display device 7 may
include configuration elements that are not disclosed in the
embodiment 9.
Embodiment 10
[0626] FIG. 129 is a plan view of an illumination device in
accordance with the present invention. The illustrated illumination
device is constructed as a backlight device which is arranged in
the rear of a liquid crystal display panel, and is used so as to
apply light uniformly to a whole surface of the liquid crystal
display panel, has a rectangular planar shape which corresponds to
the liquid crystal display panel serving as an irradiated body, is
provided with a backlight chassis 1 (B6) which is formed as a
shallow bottomed box shape, and is configured by arranging a lot of
light-emitting diodes (LED) 2, 2, . . . (B1) as a light source
vertically and horizontally in a whole surface of a bottom plate 10
(B61) in an inner portion of the backlight chassis 1.
[0627] As shown in FIG. 129, the LED 2, 2, . . . (B1) are mounted
in increments of plural numbers (five or eight in the figure) on
the LED substrates 20, 20, . . . (B3). The LED substrate 20 (B3)
has a strip shape of a narrow width and a large length, and a
plurality of LED 2, 2, . . . are mounted in a center portion in a
width direction of one surface of the LED substrate 20 so as to be
spaced at uniform distances from each other in a longitudinal
direction.
[0628] An arrangement of the LED 2, 2, . . . on the bottom plate 10
of the backlight chassis 1 is achieved, for example, by arranging
the LED substrate 20 on which five LED 2, 2, . . . are mounted, and
the LED substrate 20 on which eight LED 2, 2, . . . are amounted,
in a longitudinal direction, and arranging them in a plurality of
rows (nine rows in the figure) so as to be spaced at uniform
distances, as shown in FIG. 129. In this case, the number of the
LED substrates 20, 20, . . . and the arrangement of these on the
bottom plate 10 are not limited to the illustrated aspect, but can
be appropriately set in correspondence to a magnitude and a shape
of the backlight chassis 1. Further, the number or the LED 2, 2, .
. . which are mounted on each of the LED substrates 20 is not
limited to the illustrated five or eight, but can be set to an
appropriate number.
[0629] FIG. 130 is a plan view of the backlight chassis 1, and
shows a state before the LED substrates 20, 20, . . . are attached.
As shown in the figure, a plurality of fixing holes 11, 11, . . .
(B64), a plurality of positioning holes 12, 12, . . . (B67) and a
plurality of parts attaching holes 13, 13, . . . (B66) are formed
in the bottom plate 10 of the backlight chassis 1 in such a manner
as to pass through back and front.
[0630] The fixing holes 11, 11, . . . (B64) are holes for fixing
the LED substrates 20, 20, . . . , and are provided by making four
which line up in the longitudinal direction of the bottom plate 10
a set and arranging this in nine rows at uniform distances in a
width direction of the bottom plate 10, in such a manner as to
correspond to the arrangement of the LED substrates 20, 20, . . .
shown in FIG. 129. In FIG. 130, the positions of the LED substrates
20, 20, . . . are shown by a two-dot chain line. Four fixing holes
11, 11, . . . in each of the rows are positioned in the vicinity of
both end portions of the LED substrates 20, 20, . . . in the center
portion in the width direction of two LED substrates 20 and 20 on
the same row.
[0631] The positioning holes 12, 12, . . . (B67) are provided for
positioning an element member plate with respect to a metal mold
for forming by engaging with a projection which is provided in the
metal mold, at a time of manufacturing the backlight chassis 1 in
accordance with a press molding. In the figure, the positioning
holes 12, 12, . . . are formed at three positions within the
surface of the bottom plate 10. It is desirable that the
positioning holes 12, 12, . . . are formed at three positions or
more for making the positioning within the surface of the metal
mold possible, and the forming positions are set uniformly within
the surface of the bottom plate 10, as illustrated.
[0632] The parts attaching holes 13, 13, . . . (B66) are provided
for attaching the constructing parts of the backlight device and
the liquid crystal display device using it, such as a cooling fan,
a power supply circuit, various connecting cables and the like, and
these parts attaching holes 13, 13, . . . are formed respectively
in bottom portions of recesses 14, 14, . . . formed by depressing
the corresponding portions of the bottom plate 10 to the back face
side so as to pass through. The number and the arrangement of the
parts attaching holes 13, 13, . . . can be appropriately set in
correspondence to the number and the position of the constructing
parts to be attached. In the figure, four parts attaching holes 13,
13, . . . are arranged in a random order within the surface of the
bottom plate 10.
[0633] In the illumination device in accordance with the present
invention, the positioning holes 12, 12, . . . and the parts
attaching holes 13, 13, . . . mentioned above are provided in such
a manner as to be positioned between the fixing holes 11 and 11, on
a line connecting two fixing holes 11 and 11 which are set with
respect to each of the LED substrates 20.
[0634] FIG. 131 is a perspective view showing an outer appearance
of the LED substrate 20. FIG. 132 is a cross sectional view by a
line XII-XII in FIG. 129 showing an attached portion of the LED
substrate 20, and FIG. 133 is a cross sectional view by a line
XIII-XIII in FIG. 129 in the same manner.
[0635] As shown in these figures, upper portions of the LED 2, 2, .
. . which are mounted on the LED substrate 20 are covered
individually by the light diffusing lens 3, 3, . . . (B2) attached
to the LED substrate 20. The lens 3 has a circular planar shape as
shown in FIG. 131, and is a convex lens having a cross sectional
shape in which one surface is flat and another surface is curved
convexly, as shown in FIG. 132 and FIG. 133. A recess 30 (B21) is
provided in the center of the flat one surface of the lens 3, and a
plurality of support leg portions 31, 31, . . . (B22) are
integrally provided in a protruding manner in the periphery of the
recess 30. The lens 3 constructed as mentioned above is positioned
in such a manner that the LED 2 is received within the recess 30 in
the center while setting the flat surface below, as shown in FIG.
132 and FIG. 133, and is fixed and supported to a position which is
away from the surface of the LED substrate 20 at an appropriate
length, by bonding each of three support leg portions 31, 31, . . .
to the LED substrate 20.
[0636] As shown in FIG. 131, terminal portions 22 and 23 (B31 and
B32) for connecting to an external portion are provided in both end
portions of the LED substrate 20. Further, through holes 21 and 21
(B33 and B34) passing through a center position in the width
direction rear and front are provided in the vicinity of both end
portions of the LED substrate 20, particularly, between the LED 2
and 2 in both ends and the LED 2 and 2 which are adjacent to each
other. These through holes 21 and 21 correspond to the positions of
the fixing holes 11 and 11 which are formed as mentioned above in
the bottom plate 10 of the backlight chassis 1. The LED substrate
20, 20, . . . are fixed to the backlight chassis 1 by arranging the
respective through holes 21 and 21 on the bottom plate 10 in
correspondence to the positions of the individual fixing holes 11
and 11, and inserting a substrate retaining device 6 (B7) to an
alignment portion of the through hole 21 and the fixing hold 11, as
shown in FIG. 129.
[0637] The substrate retaining device 6 (B7) is provided with a
fixing claw 61 which protrudes from one surface of a pressing plate
60 formed as a disc shape, as show in FIG. 132, and pinches and
fixes the LED substrate 20 between the pressing plate 60 and the
support plate 1, by putting the fixing claw 61 through the through
hole 21 of the LED substrate 20 and the fixing hold 11 of the
bottom plate 10, and engaging with a peripheral edge in a back
surface side of the fixing hold 11. In this case, this pinching is
carried out via a reflection sheet 5 which is provided in such a
manner as to cover a whole surface of the bottom plate 10. The
reflection sheet 5 (B5) is a sheet which has an excellent light
reflectance and is made of a resin, such as a polycarbonate or the
like. The reflection sheet 5 also covers the upper surface of the
LED substrate 20, and the lens 3 (B2) covering the mounting
position of the LED 2 is exposed to the surface of the reflection
sheet 5 via an individual through hole 51 (B53) formed at the
corresponding position of the reflection sheet 5. In this case, an
illustration of the reflection sheet 5 is omitted in FIG. 129.
[0638] Further, the substrate retaining device 6 is provided with a
support projection 62 (B83) which is provided in a rising manner in
another surface of the pressing plate 60. The support projection 62
is provided in such a manner as to support a diffusion plate which
is faced to the bottom plate 10 of the backlight chassis 1 from a
back face. The support projection 62 may be configured such that a
part of the substrate retaining device 6 has, in addition that all
the substrate retaining device 6 has.
[0639] Two LED substrates 20 and 20 which are lined up in such a
manner as to be continuous in a length direction on the bottom
plate 10 of the backlight chassis 1 are connected to each other, by
connecting respective terminal portions 22 and 22 which are at
mutually opposed positions by a connector 4 (B4), as shown in FIG.
129. Terminal portions 23 and 23 in another end are used for
connecting to an external power supply, and the LED 2, 2, . . .
mounted on the LED substrates 20, 20, . . . emit light on the basis
of a power feed from the external power supply. The light emission
of each of the LED 2, 2, . . . disperses uniformly within the
surface of the bottom plate 10 of the backlight chassis 1, on the
basis of a synergetic effect of the diffusion by the individual
lenses 3, 3, . . . and the reflection by the reflection sheet 5,
and is applied onto the irradiated body which is arranged so as to
be opposed to the bottom plate 10.
[0640] In the illumination device in accordance with the present
invention, the bottom plate 10 of the backlight chassis 1 is
provided with the positioning holes 12, 12, . . . (B67) and the
parts attaching holes 13, 13, . . . (B66) which pass through the
bottom plate 10 back and forth. These positioning holes 12, 12, . .
. and the parts attaching holes 13, 13, . . . have the positional
relationship mentioned above with respect to the fixing holes 11,
11, . . . which are used for fixing the LED substrate 20, and come
to a state of being occluded by the LED substrates 20, 20, . . .
which are attached to the fixing holes 11, 11, . . . as mentioned
above. In this case, the parts attaching holes 13, 13, . . . are
provided in the inner portion of the recesses 14, 14, . . . which
are provided by depressing the bottom plate 10, however, the LED
substrates 20, 20, . . . occlude a whole of these recesses 14, 14,
. . . .
[0641] Accordingly, there is no risk that the dusts enter into the
inner portion of the backlight chassis 1 through the positioning
holes 12, 12, . . . and the parts attaching holes 13, 13, . . .
under the used state, and it is possible to prevent the dusts from
being attached and piled up on the surfaces of the LED 2, 2, . . .
and the lens 3, 3, . . . and the surface of the reflection sheet 5,
and prevent an optical problem such as a non-uniformity of the
applying light, an illumination intensity defect or the like from
being generated. Further, it is possible to prevent the dusts
having a conductivity from being attached to the surfaces of the
LED substrates 20, 20, . . . and prevent an electric problem from
being generated in a driving circuit of the LED 2, 2, . . . formed
in the LED substrates 20, 20, . . . .
[0642] Further, the light emission mentioned above by the LED 2, 2,
. . . does not leak out to the external portion via the positioning
holes 12, 12, . . . and the parts attaching holes 13, 13, . . .
which are occluded by the LED substrates 20, 20, . . . , and it is
possible to dissolve such a risk of making a user viewing the
leaking light nourish a fear of insecurity.
[0643] The occlusion of the positioning holes 12, 12, . . . and the
parts attaching holes 13, 13, . . . by the LED substrates 20, 20, .
. . can be achieved by appropriately defining the positions of the
positioning holes 12, 12, . . . and the parts attaching holes 13,
13, . . . with respect to the fixing holes 11, 11, . . . of the LED
substrates 20, 20, . . . at a time of designing the backlight
chassis 1.
[0644] As shown in the embodiment 10, in the case of using the
strip shaped LED substrate 20 (B3), and fixing the LED substrate 20
to the bottom plate 10 by the fixing holes 11 and 11 in the
vicinity of both end portions, the positioning hole 12 and the
parts attaching hole 13 can be securely occluded by being formed
between both the fixing holes 11 and 11 on the line connecting
these fixing holes 11 and 11. The LED substrate 20 has an
appropriate elasticity, and is well attached close to the bottom
plate 10 only by fixing the vicinity of both the end portions by
the substrate retaining device 6, whereby the positioning holes 12,
12, . . . and the parts attaching holes 13, 13, . . . can be
securely occluded. However, in order to secure the occlusion, the
other fixing means such as an adhesive bonding or the like may be
used at the same time. The positioning holes 12, 12, . . . and the
parts attaching holes 13, 13, . . . may be arranged at a position
which is deviated in a width direction of the LED substrate 20 from
the line connecting two fixing holes 11 and 11, in addition to
being arranged in such a manner as to be positioned between these
fixing holes 11 and 11 on the line connecting two fixing holes 11
and 11, and may be positioned at any position which is occluded by
the LED substrate 20.
[0645] The recess 14 around the parts attaching hole 13 is provided
in such a manner as to secure a space in the back face side of the
LED substrate 20 occluding said recess 14, and make the attachment
of the parts to the parts attaching hole 13 by a retainer, a
clipping or the like possible. The through hole occluded by the LED
substrate 20, 20, . . . is not limited to the positioning holes 12,
12, . . . and the parts attaching holes 13, 13, . . . mentioned
above, but may be configured by a hole which is used for the other
purposes.
[0646] In this case, the shape of the LED substrates 20, 20, . . .
is not limited to the strip shape, but may be formed as an
appropriate shape such as a rectangular shape, a square shape, a
circular shape or the like. Even in this case, it is possible to
achieve a secure occlusion by appropriately setting the positions
of the positioning holes 12, 12, . . . and the parts attaching
holes 13, 13, . . . with respect to the fixing positions of the LED
substrates 20, 20, . . . in a design stage of the backlight chassis
1. However, since it is possible to arrange a plurality of LED
substrates 20, 20, . . . having a comparatively narrow width in a
plurality of rows so as to be spaced, by forming the LED substrates
20, 20, . . . as the strip shape, it is possible to reduce a total
area of the LED substrates 20, 20, . . . , it is possible to reduce
a cost of the LED substrates 20, 20, . . . , and further a cost of
the illumination device, and it is possible to occlude the
positioning holes 12, 12, . . . and the parts attaching holes 13,
13, . . . by the LED substrates 20, 20, . . . regardless of the
spaced or parallel arrangement.
[0647] FIG. 134 is a cross sectional view of a liquid crystal
display device in accordance with the present invention which is
provided with the illumination device structured as mentioned above
as the backlight device. The liquid crystal display device is
provided with a liquid crystal display panel 8 (A1) serving as an
image display unit. The liquid crystal display panel 8 and a
plurality of optical sheets 81, 81, . . . (diffusion plates,
reflection polarizing plates, prism sheets, diffusion sheets and
the like) (C) are stacked each other, and peripheral edge portions
are integrally pinched by a front retention frame body 82 (A2) and
a rear retention frame body 83 (A3) so as to configure a liquid
crystal module.
[0648] The backlight device (B) is configured by arranging the LED
substrates 20, 20, . . . (B3) in the inner portion of the backlight
chassis 1 (B6) formed by uprising a frame portion 15 (B62) in a
peripheral edge of a bottom plate 10 (B61) as mentioned above, and
covering upper portions thereof by the reflection sheet 5, and the
LED 2, 2, . . . lined up on the bottom plate 10 is attached in such
a manner as to be opposed to the back face of the liquid crystal
display panel 8 serving as the irradiated body via the optical
sheets 81, 81, . . . , by fixing the peripheral edge of the frame
portion 15 to the back face of the rear retention frame body
83.
[0649] The substrate retaining device 6 pinching and fixing the LED
substrates 20, 20, . . . and the reflection sheet 5 with respect to
the bottom plate 10 is provided with a support projection 62. The
support projection 62 brings its leading end into contact with the
optical sheet 81, as illustrated, limits the deflection of the
optical sheet 81, and carries out an action of keeping the distance
with respect to the LED 2, 2, . . . on the bottom plate 10
appropriately.
[0650] The liquid crystal display device is configured by fixing
the liquid crystal module and the backlight device to a front face
cabinet 80a via the front retention frame body 82 and the rear
retention frame body 83 which pinch the peripheral edge thereof,
and covering a back face of the front face cabinet 80a by a back
face cabinet 80b. In the liquid crystal display device configured
as mentioned above, the light emission of the LED 2, 2, . . . lined
up on the bottom plate 10 of the backlight chassis 1 is uniformly
applied on a whole surface of the liquid crystal module which is
arranged so as to be opposed to the bottom plate 10, and transmits
the optical sheets 81, 81, . . . and the liquid crystal display
panel 8, and a desired image is displayed on the display surface of
the liquid crystal display panel 8 which is exposed to a front face
opening of the front face cabinet 80a.
[0651] In this case, the liquid crystal display device mentioned
above is one of application examples of the illumination device in
accordance with the present invention, and it goes without saying
that the illumination device in accordance with the present
invention can be applied to various intended uses in which a
uniform light application onto a whole surface of a sheet
irradiated body is requested.
[0652] In the embodiment mentioned above, the box-shaped chassis 1
in which the bottom plate 10 and the frame portion 15 are
integrated is used, however, the chassis 1 may be formed as a
tabular shape. FIG. 135 is a cross sectional view showing another
embodiment of the liquid crystal display device in accordance with
the present invention. The illustrated liquid crystal display
device is provided with the tabular chassis 1.
[0653] A frame body 16 is fixed to a peripheral edge portion of the
chassis 1 in such a manner as to rise on one surface (a surface in
which the LED substrates 20, 20, . . . are provided in parallel).
The illustrated frame body 16 is fixed by a rivet 17, however, this
fixing can be achieved by an appropriate means such as a bolt
fixing, an adhesive bonding or the like. The chassis 1 configured
as mentioned above is attached in such a manner that the LED 2, 2,
. . . lined up in the one surface are opposed to the back face of
the liquid crystal display panel 8 as an irradiated body via the
optical sheets 81 and 81, by fixing the peripheral edge of the
frame body 16 to the back face of the rear retention frame body
83.
[0654] The other configurations and motions of the liquid crystal
display device shown in FIG. 135 are the same as the liquid crystal
display device shown in FIG. 134, and a description of the
configuration and the motion is omitted by attaching reference
numerals which are in common with FIG. 134 to the corresponding
constructing members.
Embodiment 11
[0655] A description will be in detail given below of the present
invention on the basis of the accompanying drawings which show a
display device in accordance with an embodiment.
[0656] FIG. 136 is a cross sectional view showing a partial
structure of the display device provided with the backlight device
in accordance with the present invention, FIG. 137 is a partially
enlarged cross sectional view showing a structure of the backlight
device in accordance with the present invention, FIG. 138 is a
cross sectional view showing a structure of a rivet of the
backlight device in accordance with the present invention, FIG. 139
is a partly omitted plan view of the backlight device in accordance
with the present invention, FIG. 140 is a partly exploded schematic
perspective view of the backlight device in accordance with the
present invention, and FIG. 141A and FIG. 141B are partly enlarged
plan views showing a structure of a reflection sheet of the
backlight device in accordance with the present invention.
[0657] As shown in FIG. 136, the display device is provided with an
approximately rectangular parallelepiped display unit 10 (A) which
has a display surface displaying an image in a front side, a
backlight device A (B) which is arranged in a rear side of the
display unit 10, and a cabinet 11 (D) which covers a peripheral
edge portion of the display unit 10 and a rear side of the
backlight device A. In this case, the cabinet 11 houses a power
supply circuit board which feeds an electric power to the display
unit 10, a terminal circuit board which processes an image
displayed on the display unit 10, and a plurality of circuit boards
(not shown) (B10) such as a control circuit board or the like which
controls the display unit 10, and the LED 1 (B1) and the display
panel 12 (A1) are driven on the basis of an output from the circuit
boards.
[0658] The display unit 10 (A) has a display panel 12 (A1) which
has a display surface, and an optical sheet 13 (C) which is
arranged in a rear side of the display panel 12. A peripheral edge
portion of the display panel 12 is retained so as to be pinched
back and front by a front retention frame body 14 (A2) and a rear
retention frame body 15 (A3), and configures a panel module, and
the rear retention frame body 15 is attached to a peripheral edge
portion of the support member 7 (B6).
[0659] The optical sheet 13 (C) is a laminated body obtained by
laminating a comparatively thick diffusion plate which diffuses
uniformly the light emitted by the LED 1, that is, the
light-emitting element serving as the light source, and a
comparatively thin resin sheet such as a reflection polarizing
plate, a prism sheet, a diffusion sheet or the like.
[0660] The support member 7 (B6) has a plate portion 71 (B61) and a
frame portion 72 (B62) which is connected to a peripheral edge of
the plate portion 71, and supports the peripheral edge portion of
the diffusion plate to the frame portion 72.
[0661] The backlight device A (B) in accordance with the present
invention is provided with a plurality of LEDs 1 (B1) which are
arranged in a matrix manner and serve as a light source, a
plurality of LED substrates 2 (B3) which mount the LED 1 in one
surface 2a, and are arranged in parallel in vertical and horizontal
two directions, a plurality of connectors 3 (B4) which connect the
adjacent LED substrates 2 and 2 to each other, a support pin 4 (B8)
which supports the optical sheet 13, a plurality of lenses 5 (B2)
which are attached to the one surface 2a of the LED substrate 2 so
as to be opposed to a top portion of the LED 1, and diverge the
light emitted by the LED 1, a reflection sheet 6 (B5) which is
opposed to the one surface 2a of the LED substrate 2 and reflects
the light diverged by the lens 5, a support member 7 (B6) which
supports the LED substrate 2, and a plurality of rivets 8 (B7)
which fix the reflection sheet 6 to the support member 7 for
preventing the reflection sheet 6 from lifting.
[0662] The LED substrate 2 (B3) is formed as a strip shape which
has a circuit portion in the one surface 2a, and is arranged in a
plurality of rows in vertical and horizontal directions on one
surface of the support member 7 which is formed as an approximately
rectangular shape. A plurality of LEDs 1 are mounted on the one
surface 2a of each of the LED substrates 2 so as to be close in a
longitudinal direction, as shown in the figure, and connecting
portions 21 and 22 (B31 and B32) having terminals are provided in
both end portions in the longitudinal direction of the one surface
2a.
[0663] The LED 1 (B1) is configured, as shown in FIG. 139, such
that five or six are mounted, for example, so as to be spaced in
the longitudinal direction of the LED substrate 2, and five or six
lenses 5 are attached to the one surface 2a by an adhesive agent in
correspondence to each of the LED 1.
[0664] For the parallel arranged LED substrate 2 (B3), in the LED
substrates 2 of one row in the longitudinal direction, two adjacent
connecting portions 21 and 21 (B31 and B32) are connected to each
other by the connector 3 (B4), the connecting portion 22 of one LED
substrate 2 is connected to the power supply circuit board by the
second connector (B41), and a short connector is connected to the
connecting portion 22 of another LED substrate 2. The LED substrate
2 is provided in an opening manner with a support pin insertion
hole 23 (B36) at a position corresponding to the support pin 4, and
a rivet insertion hole 24 (B36) at a position corresponding to the
rivet 8.
[0665] The connector 3 (B4) is formed as an approximately
parallelepiped shape, is provided with terminals corresponding to
the connecting portions 21 and 21 in both end portions in a
longitudinal direction of one surface, and laps over the one
surface 2a of the LED substrate 2 at a time of being connected to
the connecting portions 21 and 21.
[0666] The lens 5 (B2) has a translucent portion 51 (B21) which is
opposed to be spaced from the top portion of the LED 1, and has a
hemispheric recess for diverging the light emitted by the LED 1 to
all directions, and three positioning projections 52 (B22) which
protrude toward the LED substrate 2 from a surface opposed to the
one surface 2a of the translucent portion 51, and fix the position
with respect to the LED substrate 2 of the translucent portion 51,
and a leading end of the positioning projection 52 is attached to
the one surface 2a by an adhesive agent.
[0667] The positioning projection 52 is set such as to be slightly
longer than a thickness of the reflection sheet 6 in a distance
between the translucent portion 51 and the LED substrate 2, and is
configured such that it can absorb a thermal expansion of the
reflection sheet 6.
[0668] The reflection sheet 6 (B5) includes one synthetic resin
sheet which has a high reflectance and is formed as an
approximately rectangular shape in correspondence to the support
member 7, is provided in an opening manner with a through hole 61
(B53) at a position corresponding to each of the lenses 5, is
provided in an opening manner with a through hole 62 at a position
corresponding to the connector 3, is provided with a support pin
hole 63 (B55), that is, a first through hole at a position
corresponding to the support pin 4, and is provided with a rivet
hole 64 (B55), that is, a second through hole at a position
corresponding to the rivet 8. In this case, the support pin hole 63
has a diameter which is larger than the support pin insertion hole
23, and the rivet hole 64 has a diameter which is larger than the
rivet insertion hole 24. As shown in FIG. 141, a small hole 65
(B55a) is provided as an identifying mark in a peripheral edge
portion of the support pin hole 63.
[0669] The through hole 61 is formed as a round shape which has a
slightly larger diameter than the translucent portion 51 (B21) of
the lens 5, and is arranged in a matrix manner. The translucent
portion 51 of the lens 5 is arranged in the through hole 61. The
through hole 62 is formed as an approximately rectangular shape,
and the connector 3 is fitted thereto. Further, the support pin
hole 63 is formed as a round shape which is larger than an
attaching portion 43 of the support pin 4 and smaller than a collar
portion 42, and the attaching portion 43 is inserted thereto, and
the rivet hole 64 is formed as a round shape which is larger than
an elastic portion 82b of the rivet 8 and smaller than a head
portion 81a, and the elastic portion 82b is inserted thereto.
[0670] The support member 7 (B6) is formed as a metal plate, has a
tabular plate portion 71 (B61) which is formed as an approximately
rectangular shape and a frame portion 72 (B62) which is connected
to a peripheral edge of the plate portion 71, and houses and
supports the LED substrate 2 in one surface of the plate portion 71
so as to be lined up in a longitudinal direction and a width
direction.
[0671] The support member 7 is provided with a plurality of through
holes 73 (B65) in an opening manner at positions corresponding to
the support pin insertion holes 23. A diameter of the through hole
74 is approximately the same as the diameter of the rivet insertion
hole 24.
[0672] The support pin 4 (B8) is provided with a columnar portion
41 (B83) which extends out of the LED substrate 2 in the direction
of the one surface 2a, and comes into contact by its leading end
with the optical sheet 13 so as to restrict a deflection of the
optical sheet 13, a collar portion 42 which extends out of a
peripheral edge side of a base end of the columnar portion 41
toward an outer side in a horizontal direction, and an attaching
portion (a foot portion) 43 which protrudes out of the collar
portion 42 along a direction opposed to the columnar portion 41,
and is inserted to the support pin insertion hole 23 and the
through hole 73.
[0673] The columnar portion 41 is formed as an approximately
conical shape, and is formed integrally with the collar portion 42.
The attaching portion 43 has a columnar connecting portion 43a
which is directed to an opposed direction to the columnar portion
41 from the collar portion 42, and two claw portions 43b which are
connected to a leading end of the connecting portion 43a and are
engaged to a hole edge portion of the through hole 74. The support
pin 4 is attached to the LED substrate 2 and the support member 7
by inserting the attaching portion 43 to the insertion hole 23. The
support pin 4 is opposed at such a slight distance that a leading
end of the columnar portion 41 comes into contact with one surface
of the optical sheet 13, at a position which is opposed to the
optical sheet 13, restricts the deflection of the optical sheet 13,
and keeps a distance between the optical sheet 13 and the LED
substrate 2 uniform.
[0674] In the case that the support pin 4 is attached to the LED
substrate 2 and the support member 7, the collar portion 42 extends
to a small hole 65 in an outer side of a support pin hole 63 which
is provided in an opening manner in the reflection sheet 6, in its
outer peripheral portion. The collar portion 42 and the reflection
sheet 6 do not come into contact and a slight gap is provided. In
accordance with this, in the case that the support pin 4 is
attached, the small hole 65 provided in an opening manner in an
outer side of the support pin hole 63 is invisible.
[0675] Further, the support member 7 is provided with a plurality
of through holes 74 (B65) at positions corresponding to the rivet
insertion holes 24, as shown in FIG. 138. A diameter of the through
hole 74 is approximately equal to a diameter of the rivet insertion
hole 24.
[0676] The rivet 8 (B7) is made of, for example, a metal or a
carbon material, and is inserted to the rivet insertion hole 24 and
the through hole 74. The LED substrate 2 is fixed to the support
member 7 by the rivet 8. The rivet 8 is provided with a reception
rivet 82 (B71) and an insertion rivet 81 (B72).
[0677] The reception rivet 82 (B71) is provided with a retainer
portion 82a (B71a) which is formed as an annular shape having a
diameter which is a little larger than a diameter of the rivet
insertion hole 24, and an outer peripheral portion of the retainer
portion 82a is retained to an edge portion of the rivet insertion
hole 24 in an inner side of the rivet hole 64 which is provided in
an opening manner in the reflection sheet 6 and yet in an outer
side of the rivet insertion hole 24. A plurality of elastic
portions 82b are provided in parallel in a peripheral direction at
an inner peripheral portion of the retainer portion 82a. The
elastic portion 82b protrudes along an axial direction of the
retainer portion 82a, and is inserted to the rivet insertion hole
24 and the through hole 74. A dimension in an axial direction of
the elastic portion 82b is larger than the dimension in the axial
direction of the rivet insertion hole 84 and the through hole 74,
and a protruding end portion of the elastic portion 82b extends out
of the through hole 74 in an axial direction. A contact portion 82c
extending to an inner side in a diametrical direction of the
retainer portion 82a is provided in the protruding end portion of
the elastic portion 82b so as to be integral with the elastic
portion 82b, and a gap is provided between the contact portions 82c
and 82c.
[0678] A leg portion 81b mentioned below comes into contact with an
inner side of the contact portion 82c, the elastic portion 82b
curves to an outer side due to the contact of the leg portion 81b,
and the elastic portion 82b comes into contact with an edge portion
of the through hole 74. Accordingly, the LED substrate 2 and the
support member 7 are pinched back and front between the retainer
portion 82a and the elastic portion 82b.
[0679] The insertion rivet 81 (B72) is provided with a head portion
81a (B72a) which has a larger diameter than the insertion hold 11b,
and a columnar leg portion 81b which is vertical to the head
portion 81a is provided in the center portion of the head portion
81a. A taper 81ba is formed in a leading end portion of the leg
portion 81b in such a manner that a diameter of the leg portion 81b
becomes smaller toward a leading end. The diameter of the leg
portion 81b in the vicinity of the head portion 81a is
approximately the same as an inner diameter of the retainer portion
82a, and becomes larger than a dimension between the contact
portions 82c in the case that the leg portion 81b is not inserted.
In this case, the edge portion of the head portion 81a extends to
the leg portion 81b side, and an extending width of the edge
portion of the head portion 81a is smaller than a dimension in the
axial direction of the retainer portion 82a. Further, the diameter
of the head portion 81a is smaller than the diameter of the collar
portion 42 of the support pin 4.
[0680] The leg portion 81b of the insertion rivet 81 is inserted to
the retainer portion 82a, and the leading end portion of the leg
portion 81b is inserted to the gap between the contact portions
82c. The taper 81ba is formed in the leading end portion of the leg
portion 81b, and the gap is expanded by the insertion of the leg
portion 81b. The elastic portion 82b is curved to the outer side,
and comes into contact with the edge portion of the through hole
74. The support member 7 and the LED substrate 2 are pinched by an
appropriate pressure by the elastic portion 82b and the retainer
portion 82a, and the LED substrate 2 and the support member 7 are
attached closely.
[0681] The head portion 81a comes into contact with the retainer
portion 82a, and does not come into contact with the reflection
sheet 6. A slight gap is provided between an edge portion of the
head portion 81a extending to the leg portion 81b side and the
reflection sheet 6. The reflection sheet 6 is retained by an edge
portion of the head portion 81a. In accordance with this, it is
possible to prevent the reflection sheet 6 from lifting with
respect to the LED substrate 2.
[0682] In the backlight device configured as mentioned above, in a
state in which the support member 7 is mounted on a working table
in such a manner that the opening side is directed upward, a
plurality of LED 1 are mounted on the one surface 2a, the LED
substrate 2 to which the lens 5 opposed to the top portion of each
of the LED 1 is attached is arranged in the one surface of the
plate portion 72 in the support member 7 so as to come close in the
horizontal direction and be spaced in the vertical direction, and
the LED substrates 2 which are adjacent to each other in the
horizontal direction are connected by the connector 3. Further, the
reflection sheet 6 is mounted on the one surface 2a of each of the
LED substrates 2 so as to be opposed.
[0683] At this time, the translucent portion 51 in the lens 5
passes through each of the through holes 61 of the reflection sheet
6, and the connector 3 passes through each of the through holes 62.
Further, each of the support pin holes 63 of the reflection sheet
6, each of the support pin insertion holes 23 of the LED substrate
2, and each of the through holes 73 of the support member 7 are
aligned in their positions, and each of the rivet holes 64 of the
reflection sheet 6, each of the rivet insertion holes 24 of the LED
substrate 2, and each of the through holes 74 of the support member
7 are aligned in their positions.
[0684] After the reflection sheet 6 is assembled, the support pin 4
and the rivet 8 are attached. Particularly, the attaching portion
43 of the support pin 4 is fitted and locked to the support pin
insertion hole 23 of the LED substrate 2 and the through hole 73 of
the support member 7 by the support pin hole 63 of the reflection
sheet 6, and the support pin 4 is fixed to the support member 7.
The rivet 8 is fixed to the support member 7 by inserting the
reception rivet 82 of the rivet 8 to the rivet insertion hole 24 of
the LED substrate 2 and the through hole 74 of the support member 7
by the rivet hole 64 of the reflection sheet 6, thereafter
inserting the leg portion 81b of the insertion rivet 81 to the
retaining portion 82a of the reception rivet 82, and inserting the
leading end portion of the leg portion 81b to the gap between the
contact portions 82c.
[0685] As shown in FIG. 140, the support pin hole 63 and the rivet
hole 64 have a small difference in an outer shape dimension and are
hard to be distinguished in their outer appearance, and it is hard
to discriminate. However, it is possible to recognize on the basis
of a visual observation by forming an identification mark of the
small hole 65 in the peripheral edge of the support pin hole 63,
and an erroneous attachment of the support pin 4 and the rivet 8
does not occur.
[0686] Further, as shown in FIG. 141A, in the backlight device in
accordance with the present invention, a diameter of the head
portion 81a of the rivet 8 is smaller than a diameter of the collar
portion 42 of the support pin 4. Further, the small hole 65 for
identification provided in an opening manner in the peripheral edge
of the support pin hole 63 is provided at the position which is not
covered by the rivet 8 but is covered by the support pin 4. It is
provided in such a manner as to be covered by the collar portion 42
of the support pin 4 in the case that the support pin 4 is inserted
to the support pin hole 63, and in such a manner that at least a
part thereof is visible in the case that the rivet 8 is inserted to
the support pin hole 63. In accordance with this, since the small
hole 65 is visible in the case that the rivet 8 is erroneously
attached to the support pin hole 63, it is possible to immediately
know an error, and it is possible to securely attach the support
pin 4. In this case, if the support pin 4 is erroneously attached
to the rivet hole 64 inversely, the number of the support pins 4 is
increased, and the optical sheet 13 can be securely supported.
Further, since the reflection sheet is retained, any problem does
not particularly occur.
[0687] Further, in the backlight device in accordance with the
present embodiment 11, the small hole 65 (B55a) is utilized as the
identification mark. The small hole 65 can be formed in the
reflection sheet 6 at the same time of forming the support pin hole
63. Accordingly, it is possible to securely attach without any
special steps and man power for the identifying mark. In this case,
the identification mark is not limited to the small hole 65 which
is provided in an opening manner in the reflection sheet 6, but may
be configured such that the support pin hole 63 and the rivet hole
64 can be discriminated in accordance with a visual observation at
a time of attaching the support pin 4 and the rivet 8.
[0688] Further, in the backlight device in accordance with the
present embodiment 11, the description is given of the matter that
the support pin 4 is inserted to the support pin hole 63 so as to
be fixed to the LED substrate 2 and the support member 7, and the
rivet 8 is inserted to the rivet hole 64 so as to be fixed to the
LED substrate 2 and the support member 7, however, is not limited
to this. For example, the support pin 4 and the rivet 8 may be
fixed only to the LED substrate 2. Alternatively, in the reflection
sheet 6, the support pin hole 63 and the rivet hole 64 may be
provided in an opening manner at a position at which the LED
substrate 2 is not formed, and the support pin 4 and the rivet 8
may be respectively inserted in the support pin hole 63 and the
rivet hole 64 so as to be fixed to the support member 7.
[0689] Further, in the backlight device in accordance with the
present embodiment 11, the description is given of the matter that
the small hole 65 for identification is provided in the reflection
sheet 6 so as to prevent the erroneous attachment of the rivet 8,
however, the configuration may be made additionally such that the
substrate basis material is exposed by removing a resist around the
rivet hole 64 to which the rivet 8 is inserted, in the resist
covering the one surface 2a of the LED substrate 2. In this
configuration, since the substrate basis material around the hole
is covered at a time when the rivet 8 is inserted to the rivet hole
64, and the substrate basis material around the hole is visible at
a time when the rivet 8 is not inserted to the rivet hole 64, it is
possible to easily find neglecting of the attachment of the rivet
8.
[0690] The description is in detail given above of the embodiments
in accordance with the present invention on the basis of the
accompanying drawings, however, the present invention is not
limited to the embodiment mentioned above, but can be variously
modified and executed within the range of the scope of the present
invention.
Embodiment 12-1
[0691] A description will be in detail given below on the basis of
the accompanying drawings which show a display device in accordance
with an embodiment 12-1. FIG. 142 is a vertical cross sectional
view schematically showing the display device.
[0692] In the figure, reference numeral 1 denotes a rectangular
display panel provided with a liquid crystal, and the display panel
1 (A1) is configured such as to regulate a coefficient of
transmission of the light by controlling an applied voltage to the
liquid crystal, and display the image. The display panel 1 is
pinched its peripheral edge portion by a front retention frame body
2 (A2) and a rear retention frame body 3 (A3), and is housed in a
rectangular frame shaped front cabinet 4 (D1). The front cabinet 4
is arranged in the periphery of the front retention frame body 2
and the rear retention frame body 3. The front cabinet 4 is
provided with a rectangular opening, and a dimension of the opening
comes to a dimension which corresponds to the display panel 1. A
rear side of the display panel 1 is provided with a plurality of
optical sheets 5 (C) which collects the light of the light-emitting
diode (LED) 9 serving as the light source mentioned below toward
the display panel 1.
[0693] A diffusion plate 6 which diffuses the light of the LED 9
uniformly is provided in a rear side of the optical sheet 5. The
diffusion plate 6 is supported by an edge portion of a deep-dish
shaped support plate 7 made of a metal. A plurality of LED
substrates 8 (B3) are provided in parallel in a front face of the
support plate 7 (B6), and a membrane shaped heat radiating pattern
8a made of a heat conducting material, for example, a metal is
formed in a rear face of the LED substrate 8.
[0694] A plurality of LED 9, 9, . . . , 9 (B1) are mounted onto a
front face of the LED substrate 8 (B3), and lenses 10, 10, . . . ,
10 (B2) diffusing the light are respectively arranged in front
sides of the LED 9, 9, . . . , 9. Three projections 10a, 10a and
10a (B22) which protrude to the LED substrate 8 side are provided
in parallel in a peripheral direction at a peripheral edge portion
of the lens 10, and a leading end of the projection 10a is firmly
attached to the front face of the LED substrate 8 by an adhesive
agent.
[0695] Support tables (not shown) which support the deep-dish
shaped reflection sheet 11 (B5) are provided individually in right
and left sides of the support plate 7. A plurality of holes 11a
(B53) to which the lens 10 is inserted is provided in an opening
manner in a bottom surface of the reflection sheet 11. Each of the
lenses 10 protrudes to a front side through the hold 11a.
[0696] A deep-dish shaped rear cabinet 12 (D2) is provided in a
rear side of the support plate 7. Vertical and horizontal
dimensions of the cabinet 12 are approximately the same as vertical
and horizontal dimensions of the front cabinet 4, and an edge
portion of the rear cabinet 12 and an edge portion of the front
cabinet 4 are opposed to each other. An engagement convex portion
and an engagement recess which are not illustrated are provided
respectively in the edge portions of the front cabinet 4 and the
rear cabinet 12, and the front cabinet 4 is fixed to the rear
cabinet 12 by engaging of the engagement convex portion and the
engagement recess.
[0697] FIG. 143 is a schematic back elevational view in which the
support plate 7 is seen from a rear side, and FIG. 144 is a
perspective view which schematically shows a through hole provided
in an opening manner in the vicinity of an edge of the support
plate.
[0698] The support plate 7 (B6) is provided near its edge with a
truncated pyramid portion 7a (a protruding portion) in which a part
of the support plate 7 is protruded to a rear side, by a drawing
process. A rectangular through hole 7c (B61a) passing through back
and front is provided in an opening manner in a top surface portion
7b of the truncated pyramid portion 7a, and two notches (engagement
recesses) 7d and 7d (B61b) are formed in respective edge portions
along a longitudinal direction of the through hole 7c so as to be
spaced at an appropriate length. A dimension between the notches 7d
and 7d which are formed in one edge portion is different from a
dimension between the notches 7d and 7d which are formed in another
edge portion. A locking hole 7e (B61c) is provided in an opening
manner in the top surface portion 7b, in an outer side than the one
end edge of the through hole 7c in the longitudinal direction. A
locking projection 41 (B91d) mentioned below is locked to the
locking hole 7e.
[0699] As shown in FIG. 143, a rear surface of the support plate 7
is provided with a power supply circuit board 20 (B10a) which feeds
an electric power to the display panel 1, the LED substrate 8 and
the like, a control circuit board 21 (Blob) which carries out a
driving and a control of the display panel 1, and a signal
processing circuit board 22 (B10c) which processes an image signal
displayed on the display surface of the display panel 1. A
plurality of linear electric conductors 25 (B40) are connected to
the power supply circuit board 20, and the electric conductors 25
are connected to the LED substrate 8 while passing through the
through hole 7c. A plurality of electric conductors 25 are banded
together by a band 26 between the power supply circuit board 20 and
the through hole 7c. In this case, the electric conductor 25 is
coated by an insulating material.
[0700] A protection trunk 30 (B91) protecting the electric
conductor 25 from the edge portion of the through hole 7c is fitted
to the through hole 7c. The protection trunk 30 is short in an
axial direction, and a cross section of the protection trunk 30
which is orthogonal to the axial direction is formed as a
rectangular shape which corresponds to the through hole 7c. A lid
50 (B92) is attached to the protection trunk 30. A recess 30b
(B91a) mentioned below is formed in the protection trunk 30, and
the electric conductor 25 passes through between the recess 30b and
a lid 50, in the case that the lid 50 is attached to the protection
trunk 30.
[0701] FIG. 145 is a plan view which schematically shows the
protection trunk 30 fitted to the through hole 7c, FIG. 146 is a
schematic cross sectional view in a line VII-VII described in FIG.
145, FIG. 147 is a schematic cross sectional view in a line
VIII-VIII described in FIG. 145, and FIG. 148 is a schematic cross
sectional view in a line IX-IX described in FIG. 145.
[0702] As shown in FIG. 146 and FIG. 147, both side surfaces of the
protection trunk 30 along the longitudinal direction is narrowed in
an axial direction of the protection trunk 30 formed as a
rectangular tubular shape in one end portion side in a longitudinal
direction, the width of an intermediate portion is expanded little
by little toward one side (a lower side in FIG. 146 and FIG. 147)
in the axial direction, and the width in another end portion side
becomes wider.
[0703] As shown in FIG. 145, one end portion in the longitudinal
direction of the protection trunk 30 is opened, and the one end
portion is provided with a connecting plate 30a which connects to
both side surfaces of the protection trunk 30 along the
longitudinal direction. The connecting plate 30a is flat, and a
recess 30b (B91a) is formed by the connecting plate 30a and both
the side surfaces, as shown in FIG. 145 and FIG. 148. An inclined
plate 30c is provided in an edge portion of the recess 30b in an
opposite side to the one end portion, and the inclined plate 30c is
connected to the intermediate portion in which the width in the
axial direction of the protection trunk 30 mentioned above is
expanded little by little. Between the inclined plate 30c and
another end portion in the longitudinal direction of the protection
trunk 30, a narrow reinforcing plate 30d which is vertical to the
axial direction of the protection trunk 30 extends out of an inner
peripheral surface of the protection trunk 30 at an appropriate
length. A slit 30e along the protection trunk 30 is provided in an
opening manner in the reinforcing plate 30d which is connected to
another end portion in the longitudinal direction of the protection
trunk 30.
[0704] The protection trunk 30 (B91) is configured such that
dimensions in the longitudinal direction and the width direction
are slightly shorter than the rectangular through hole 7c, and is
fitted to the through hole 7c. As shown in FIG. 146 and FIG. 147,
in the protection trunk 30 fitted to the through hole 7c, a portion
in which the width in the axial direction is expanded little by
little, and a portion in which the width is expanded are positioned
between one surface (a lower surface in FIG. 146 and FIG. 147) of
the top surface portion 7b of the truncated pyramid portion 7a and
a front face of the support plate 7.
[0705] As shown in FIG. 146, the one side surface of the protection
trunk 30 along the longitudinal direction is provided with two
positioning plates 31 and 31 (positioning portions) which protrude
out of the one side surface and are in parallel to a diametrical
direction of the through hole 7c so as to be in parallel to the
longitudinal direction. The positioning plates 31 and 31 are
positioned in another surface side (an upper side in FIG. 146) of
the top surface portion 7b. Further, one side surface of the
protection trunk 30 along the longitudinal direction is provided
with two tabular engagement pieces (engagement protruding portions)
32 and 32 (B91b) which are in parallel to the diametrical direction
of the through hole 7c so as to be in parallel to the longitudinal
direction. The engagement pieces 32 and 32 are arranged alternately
with the positioning plates 31 and 31 in the longitudinal
direction, and are positioned in one surface side (a lower side in
FIG. 146) of the top surface portion 7b of the truncated pyramid
portion 7a. A dimension between the positioning plates 31 and 31
and the engagement pieces 32 and 32 is slightly longer than a
thickness dimension of the top surface portion 7b of the truncated
pyramid portion 7a.
[0706] Further, a claw portion 33 which protrudes outward is
provided in the one side surface of the protection trunk 30, and
the claw portion 33 is spaced at an appropriate length in the
longitudinal direction from the positioning plates 31 and 31, and
is positioned in another surface side of the top surface portion
7b. A contact portion 34 (B91c) which protrudes outward along a
corner portion and is formed as an L-shaped form in a side view is
provided in the corner portion which is positioned in another
surface side of the top surface portion 7b in the one end portion
side in the longitudinal direction, in the one side surface of the
protection trunk 30. A bent portion 55 (B92a) mentioned below comes
into contact with the contact portion 34.
[0707] On the other hand, another side surface along the
longitudinal direction of the protection trunk 30 is provided in
parallel to the longitudinal direction with two positioning plates
35 and 35 which are in parallel to the diametrical direction of the
through hole 7c, as shown in FIG. 147. The positioning plates 35
and 35 are positioned in another surface side (an upper side in
FIG. 147) of the top surface portion 7b. Further, another side
surface of the protection trunk 30 along the longitudinal direction
is provided in parallel to the longitudinal direction with two
tabular engagement pieces 36 and 36 (B91b) which are in parallel to
the diametrical direction of the through hole 7c. The engagement
pieces 36 and 36 are arranged alternately with the positioning
plates 35 and 35 in the longitudinal direction, and are positioned
in one surface side (the lower side in FIG. 147) of the top surface
portion 7b of the truncated pyramid portion 7a. The engagement
pieces 36 and 36 are arranged at positions which are asymmetric in
the width direction of the protection trunk 30 with the engagement
pieces 32 and 32 which are provided in one side surface along the
longitudinal direction of the protection trunk 30. A dimension
between the engagement pieces 36 and 36 becomes longer than a
dimension between the engagement pieces 32 and 32. In this case,
the engagement pieces 32 and 32 and the engagement pieces 36 and 36
correspond to the positions of four notches 7d, in the case that
the lid 50 is attached to the protection trunk 30.
[0708] Further, an outward protruding claw portion 37 is provided
in the another side surface of the protection trunk 30, and the
claw portion 37 is spaced at an appropriate length in the
longitudinal direction from the positioning plates 35 and 35, and
is positioned in another surface side (an upper side in FIG. 147)
of the top surface portion 7b. The claw portion 37 is arranged at a
position which is symmetrical in the width direction of the
protection trunk 30 with the claw portion 33 which is provided in
the one side surface along the longitudinal direction of the
protection trunk 30. A dimension between the positioning plates 35
and 35 and the engagement pieces 36 and 36 is slightly longer than
a thickness dimension of the top surface portion 7b of the
truncated pyramid portion 7a. Further, a contact portion 38 (B91c)
which protrudes outward along a corner portion and is formed as an
L-shaped form in a side view is provided in the corner portion
which is positioned in another surface side of the top surface
portion 7b in the one end portion side in the longitudinal
direction, in the another side surface of the protection trunk 30.
A bent portion 55 (B92a) mentioned below comes into contact with
the contact portion 38.
[0709] As shown in FIG. 146 and FIG. 147, the connecting plate 30a
is provided with a locking portion 39 which extends out of the
connecting plate 30a to one side of the axial direction. The
locking portion 39 locks to an edge portion of the through hole 7c
along the width direction. A tongue shaped extension portion 40
which extends in the longitudinal direction is provided on an outer
side surface in another end portion in the longitudinal direction
of the protection trunk 30. The extension portion 40 is positioned
in one surface side of the top surface portion 7b, and an extending
end portion of the extension portion 40 is provided with a locking
projection 41 (B91d) which protrudes to another surface side in
correspondence to the locking hole 7e (B61c). The locking
projection 41 locks to a locking hole 7e which is provided in an
opening manner in the top surface portion 7b, and carries out a
positioning of the protection trunk 30 in the diametrical direction
of the through hole 7c.
[0710] Both corner portions of the another end portion in the
longitudinal direction of the protection trunk 30 is provided with
positioning plates (positioning portions) 42 and 42 which extend
out of a side surface along the longitudinal direction and a side
surface along the width direction. The positioning plates 42 and 42
are orthogonal to a penetrating direction of the through hole 7c
and are positioned in one surface side of the top surface portion
7b. The positioning plates 42 and 42 exist at positions which are
approximately the same as the positioning plates 31 and 35
mentioned above in the penetrating direction. Accordingly, the
positioning plates 31, 35 and 42 and the engagement pieces 32 and
36 are arranged in both sides of the top surface of the truncated
pyramid portion 7a, and the positioning of the protection trunk 30
in the penetrating direction of the through hole 7c is carried
out.
[0711] In this case, each of the engagement pieces 32 and 36 is
arranged at the position which corresponds to each of the notches
7d, and in the case that the protection trunk 30 is fitted to the
through hole 7c, each of the engagement pieces 32 and 36 is engaged
with each of the notches 7d, and is positioned in one surface side
of the top surface portion 7b. Further, the locking projection 41
is locked to the locking hole 7e and the positioning plates 31, 35
and 42 and the engagement pieces 32 and 36 are arranged
respectively in both surface sides of the top surface portion 7b,
by sliding the protection trunk 30 to another end portion side in
the longitudinal direction in a state in which the positioning
plates 31, 35 and 42 are brought into contact with the top surface
portion 7b. At this time, as shown in FIG. 146 and FIG. 147, the
positioning plates 31, 35 and 42 come into contact with the top
surface portion 7b, and the portion in which the width in the axial
direction mentioned above is expanded little by little, and the
widened portion in the protection trunk 30 fitted to the through
hole 7c are positioned in a rear side rather than a front face of
the support plate 7.
[0712] The lid 50 is arranged in the portion of the protection
trunk 30 which protrudes to another surface side of the top surface
portion 7b. FIG. 149 is a plan view schematically showing the lid
50, FIG. 150 is a schematic side elevational view as seen from a
direction of F1 described in FIG. 149, FIG. 151 is a schematic side
elevational view as seen from a direction of F2 described in FIG.
149, FIG. 152 is a schematic cross sectional view in a line XI-XI
described in FIG. 149, and FIG. 153 is a schematic side elevational
view as seen from a direction of F3 described in FIG. 149.
[0713] The lid 50 (B92) is provided with a rectangular occlusion
plate portion 51 which is mounted to the protection trunk 30, side
surface portions 52 and 52 which are connected to an edge portion
of the occlusion plate portion 51 running from one end portion to
an intermediate portion in the longitudinal direction, and a side
surface portion 53 which is connected to the edge portion of the
occlusion plate portion 51 along the width direction. As shown in
FIG. 149, notches 54 and 54 are formed in both corner portions of
one end portion in the longitudinal direction of the occlusion
plate portion 51. The notches 54 and 54 are provided with bent
portions 55 and 55 (B92a) which are connected to the side surface
portions 52 and 52 and bent as an L-shaped form in such a manner
that the notch 54 side is depressed. The bent portion 55 extends
toward one end portion in the longitudinal direction of the
occlusion plate portion 51, and a space is formed by the bent
portion 55 and the notch 54. As shown in FIG. 153, the occlusion
plate portion 51 is provided between the notches 54 and 54 with an
elastic member 70 which protrudes to the bent portion 55 side and
extends in a width direction.
[0714] Another end portion in the longitudinal direction of the
occlusion plate portion 51 is slightly narrower than the
intermediate portion. An edge portion along the longitudinal
direction in the another end portion in the longitudinal direction
of the occlusion plate portion 51 is provided with hook shaped
retention portions 56 and 56 (B91e) which protrude in the same
direction as the elastic member 70 (refer to FIG. 151). As shown in
FIG. 150 and FIG. 152, retention holes 56a and 56a are provided in
an opening manner in a portion in a side of the occlusion plate
portion 51 of the retention portions 56 and 56.
[0715] Next, a description will be given of an attachment of the
lid 50 to the protection trunk 30. FIG. 154 and FIG. 155 are
explanatory views explaining the attachment of the lid 50 to the
protection trunk 30. In this case, the description of the electric
conductor 25 is omitted in FIG. 154.
[0716] As shown in FIG. 154, in the case that the lid 50 is
attached to the protection trunk 30, first of all, a plurality of
electric conductors 25 are inserted to the protection trunk 30 so
as to be arranged within the recess 30b. Next, as shown in FIG.
154, the lid 50 is set to an attitude which is inclined with
respect to the top surface portion 7b, the contact portions 34 and
38 are inserted to a space which is formed by the bent portion 55
and the notch 54, and the contact portions 34 and 38 are brought
into contact with inner corner portions of the bent portions 55 and
55. Further, the lid 50 is approximated to the protection trunk 30
while using the contact portions 34 and 38 as a supporting point,
and the retention portions 56 and 56 are brought into contact with
the claw portions 33 and 37 so as to be elastically deformed.
Further, the lid 50 is approximated to the protection trunk 30 and
the claw portions 33 and 37 are retained to the retention holes 56a
and 56a. At this time, as shown in FIG. 155, the electric conductor
25 is pinched between the elastic member 70 and the connecting
plate 30a within the recess 30b. The connecting plate 30a is flat,
and a plurality of electric conductors 25 are aligned and are in
close formation within the recess 30b.
[0717] In the display device in accordance with the embodiment
12-1, since a plurality of electric conductors 25 passing through
the through hole 7c are arranged within the recess 30b, a plurality
of electric conductors 25 are retained within the recess 30b in the
case that the protection trunk 30 is occluded by the lid 50, it is
possible to bring together the electric conductors 25 within the
recess 30b for a short time, and it is possible to prevent the
dusts from making into intrusion from the through hole 7c.
[0718] Further, since the electric conductor 25 is pinched between
the elastic member 70 and the connecting plate 30a, and the gap
within the recess 30b is filled up as well as the electric
conductors 25 are closed up by the elastic force of the elastic
member 70, it is possible to bring together the electric conductors
25 within the recess 30b for a short time, and it is possible to
securely prevent the dust from making an intrusion from the through
hole 7c.
[0719] Further, since the electric conductors 25 are easily aligned
within the recess 30b by the flat connecting plate 30a, and are
easily closed up, it is possible to securely bundle the electric
conductors 25 within the recess 30b.
[0720] As mentioned above, the dimension between the notches 7d and
7d which are formed in one edge portion is different from the
dimension between the notches 7d and 7d which are formed in another
edge portion, and the dimension between the engagement pieces 36
and 36 is longer than the dimension between the engagement pieces
32 and 32 in correspondence to the different dimensions.
Accordingly, only in the case that the protection trunk 30 is
arranged in the through hole 7c in a predetermined direction, the
engagement pieces 32 and 36 formed in the outer peripheral portion
of the protection trunk 30 is engaged with the notch 7d formed in
the edge portion of the through hole 7c. Therefore, it is possible
to avoid such a manner that the worker misidentifies the direction
of the protection trunk 30 at a time of assembling the display
device, and attaches the protection trunk 30 to the through hole
7c, and it is possible to rapidly and securely assemble the display
device.
[0721] Further, since the positioning plates 31, 35 and 42 come
into contact with the top surface portion 7b by fitting the
protection trunk 30 to the through hole 7c provided in the
truncated pyramid portion 7a, and the portion in which the width in
the axial direction is expanded little by little mentioned above
and the portion in which the width is widened are positioned in the
rear side from the front face of the support plate 7, in the
protection trunk 30 fitted to the through hole 7c, the protection
trunk 30 does not come into contact with the parts which are
arranged in the front face side of the support plate 7, and the
assembly of the display device is not prevented by fitting the
protection trunk 30 to the through hole 7c.
[0722] Further, since the locking hole 7e and the locking
projection 41 are provided in the support plate 7 and the
protection trunk 30, thereby carrying out the positioning of the
protection trunk 30 in the diametrical direction of the through
hole 7c, it is possible to securely attach the protection trunk 30
to the through hole 7c.
[0723] Further, since the positioning of the protection trunk 30 in
the penetrating direction of the through hole 7c is carried out by
the positioning plates 31, 35 and 42, it is possible to securely
fix the protection trunk 30 to the through hole 7c.
[0724] Further, since the contact portions 34 and 38 are brought
into contact with the corner in the inner side of the bent portions
55 and 55 and the lid 50 is rotated toward the protection trunk 30
by using the contact portions 34 and 38 as a supporting point, in
the case that the lid 50 is attached to the protection trunk 30,
the worker can easily attach the lid 50 to the protection trunk 30,
and it is possible to efficiently manufacture the display device
for a short time.
[0725] Further, since the lid 50 is fixed to the protection trunk
30 by retaining the claw portions 33 and 37 to the retention holes
56a and 56a, it is possible to prevent the attached lid 50 from
being detached from the protection trunk 30.
[0726] Further, since any complicated shape for inserting the
electric conductor 25 without damaging, for example, a groove
formation is not applied to the support plate 7, the support plate
7 can be manufactured for a short time. Further, it is possible to
prevent the electric conductor 25 from being scratched by the edge
of the through hole 7c, because of the protection trunk 30.
[0727] In the display device in accordance with the embodiment
12-1, the notch 7d is formed in the through hole 7c, and the
engagement pieces 32 and 36 are provided in the protection trunk
30, however, an engagement piece may be provided in the through
hole 7c and an engagement recess 30b with which the engagement
piece engages may be provided in the outer periphery of the
protection trunk 30. Further, the retainer projection is provided
in the extension portion 40, and the locking hole 7e is provided in
the top surface portion 7b, however, a retainer projection may be
provided in the top surface portion 7b, and the locking hole 7e may
be provided in the extension portion 40. Further, the recess 30b is
formed only in the protection trunk 30, however, may be formed in
the lid 50, and the mutually opposed recesses 30b may be formed in
both the lid 50 and the protection trunk 30.
[0728] Further, the display device in accordance with the
embodiment 12-1 uses the LED 9 as the light source, however, may
use a fluorescent tube as the light source. In this case, the
fluorescent tube is attached to the support plate 7 via a lamp
holder. In this case, the configuration may be made such as to use
a self luminous panel, for example, an organic EL panel as the
display panel without using a light source such as an LED or a
fluorescent tube, and input a control signal to the display panel
from a signal processing circuit 21.
Embodiment 12-2
[0729] A description will be in detail given below on the basis of
the accompanying drawings showing a display device in accordance
with an embodiment 12-2. FIG. 156 and FIG. 157 are explanatory
views explaining an attachment of the lid 50 to the protection
trunk 30 of the display device, and FIG. 158 is a perspective view
schematically showing the vicinity of an engaging shaft in an
enlarged manner. In this case, the description of the electric
conductor 25 is omitted in FIG. 156.
[0730] As shown in FIG. 156, two claw portions 80 and 80 are
provided respectively in both side surfaces along the longitudinal
direction of the protection trunk 30, and the claw portions 80 and
80 are positioned in another surface side of the top surface
portion 7b. Side surface portions 58 running from another end
portion to an intermediate portion are respectively provided in
both edge portions along the longitudinal direction of the
occlusion plate portion 51, and the side surface portions 58 are
provided with two retention holes 58a and 58a corresponding to the
claw portions 80 and 80 in an opening manner. Another end portion
of the occlusion plate portion 51 comes to a thin elastic plate
portion 51a, and contact shafts (contact portions) 51b and 51b
protruding in a width direction are provided in both corner
portions of the elastic plate portion 51a. L-shaped bent portions
45 and 45 extending outward from both side surfaces of the
protection trunk 30 along the longitudinal direction are provided
in one end portion side of the protection trunk e 30.
[0731] In the case that the lid 50 is attached to the protection
trunk 30, first of all, a plurality of electric conductors 25 are
inserted to the protection trunk 30 so as to be arranged within the
recess 30b. Next, as shown in FIG. 156, the lid 50 is set to an
inclined attitude with respect to the top surface portion 7b, and
as shown in FIG. 158, the contact shaft 51b is brought into contact
with the inner corner portions of the bent portions 45 and 45.
Further, the lid 50 is approximated to the protection trunk 30 by
using the contact shaft 51b as a supporting point, and the side
surface portion 58 is brought into contact with the claw portions
80 and 80 so as to be elastically deformed. Further, the lid 50 is
approximated to the protection trunk 30, and the claw portions 80
and 80 are retained to the retention holes 58a and 58a. At this
time, as shown in FIG. 157, the electric conductor 25 is pinched
between the elastic plate portion 51a and the connecting plate 30a
within the recess 30b. The connecting plate 30a is flat, and a
plurality of electric conductors 25 are aligned and closed up
within the recess 30b. In this case, an elastic member 70 may be
provided in the elastic plate portion 51a, and the electric
conductor 25 may be pinched between the elastic member 70 and the
connecting plate 30a.
[0732] In the structure of the display device in accordance with
the embodiment 12-2, the same reference numerals are attached to
the same structures as the embodiment 12-1, and a detailed
description thereof will be omitted.
[0733] As this invention may be embodied in several forms without
departing from the spirit of essential characteristics thereof, the
present embodiments are therefore illustrative and not restrictive,
since the scope of the invention is defined by the appended claims
rather than by the description preceding them, and all changes that
fall within metes and bounds of the claims, or equivalence of such
metes and bounds thereof are therefore intended to be embraced by
the claims.
* * * * *