U.S. patent application number 12/010689 was filed with the patent office on 2008-08-28 for liquid crystal display device.
Invention is credited to Seigo Abo, Yuji Azuma, Shunichi Matsumoto, Hiroshi Obata, Masaki Tsubokura.
Application Number | 20080204627 12/010689 |
Document ID | / |
Family ID | 39715446 |
Filed Date | 2008-08-28 |
United States Patent
Application |
20080204627 |
Kind Code |
A1 |
Tsubokura; Masaki ; et
al. |
August 28, 2008 |
Liquid crystal display device
Abstract
The present invention provides a liquid crystal display device
which reduces the occurrence of a squeal. A liquid crystal display
device includes a liquid crystal display panel and a backlight
arranged on a back surface of the liquid crystal display panel,
wherein the backlight includes a base, a plurality of rod-shaped
light sources arranged between the liquid crystal display panel and
the base, electrode fittings for supporting electrode portions of
the respective rod-shaped light sources, connection portions
allowing the plurality of electrode fittings to be connected
thereto and extending in the direction orthogonal to the
longitudinal direction of the rod-shaped light sources, pushing
members for pushing the connection portions toward a base side, and
friction sound reducing members arranged between the connection
portions and the pushing members and/or between the connection
portions and the base side.
Inventors: |
Tsubokura; Masaki; (Mobara,
JP) ; Obata; Hiroshi; (Chiba, JP) ; Matsumoto;
Shunichi; (Chiba, JP) ; Abo; Seigo; (Hitachi,
JP) ; Azuma; Yuji; (Fujisawa, JP) |
Correspondence
Address: |
REED SMITH LLP
Suite 1400, 3110 Fairview Park Drive
Falls Church
VA
22042
US
|
Family ID: |
39715446 |
Appl. No.: |
12/010689 |
Filed: |
January 29, 2008 |
Current U.S.
Class: |
349/61 |
Current CPC
Class: |
G02F 1/133612 20210101;
G02F 1/133604 20130101 |
Class at
Publication: |
349/61 |
International
Class: |
G02F 1/1335 20060101
G02F001/1335 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 30, 2007 |
JP |
2007-018817 |
Claims
1. A liquid crystal display device comprising: a liquid crystal
display panel; and a backlight arranged on a back surface of the
liquid crystal display panel, wherein the backlight includes a
base, a plurality of rod-shaped light sources arranged between the
liquid crystal display panel and the base, electrode fittings for
supporting electrode portions of the respective rod-shaped light
sources, connection portions allowing the plurality of electrode
fittings to be connected thereto and extending in the direction
orthogonal to the longitudinal direction of the rod-shaped light
sources, pushing members for pushing the connection portions toward
a base side, and friction sound reducing members arranged between
the connection portions and the pushing members and/or between the
connection portions and the base side.
2. A liquid crystal display device according to claim 1, wherein
the friction sound reducing member is formed of a strip shaped
member arranged along the extending direction of the connection
portion.
3. A liquid crystal display device according to claim 1, wherein
the friction sound reducing member is made of non-woven fabric or
rubber.
4. A liquid crystal display device according to claim 1, wherein
the pushing members are formed on side wall plates which cover the
electrode portions from above.
5. A liquid crystal display device according to claim 4, wherein
electrode support bases on which the connection portion and the
electrode fittings are mounted are arranged between the base and
the connection portions.
6. A liquid crystal display device according to claim 5, wherein
the electrode support bases and the side wall plates are fixed to
the base using screws.
7. A liquid crystal display device according to claim 1, wherein
grooves are formed at positions of the base side which face the
pushing members.
8. A liquid crystal display device according to claim 4, wherein
the side wall plates are arranged with inclination spreading at an
obtuse angle with respect to a surface of the base, and a light
reflecting function is imparted to
liquid-crystal-display-panel-side surfaces of the side wall
plates.
9. A liquid crystal display device according to claim 1, wherein
the electrode fittings are formed between the pair of connection
portions which extends in parallel to each other, and are divided
in plural numbers.
10. A liquid crystal display device according to claim 1, wherein
the electrode fittings and the connection portions are formed of a
conductive member.
11. A liquid crystal panel module comprising: a liquid crystal
display panel; and a backlight arranged on a back surface of the
liquid crystal display panel, wherein the backlight includes a base
having a rectangular shape, a plurality of rod-shaped light sources
arranged between the liquid crystal display panel and the base,
electrode fittings for supporting electrode portions of the
respective rod-shaped light sources, connection portions allowing
the plurality of electrode fittings to be connected thereto and
extending along short sides of the base, pushing members for
pushing the connection portions toward a base side, and friction
sound reducing members arranged between the connection portions and
the pushing members and/or between the connection portions and the
base side.
12. A liquid crystal panel module according to claim 11, wherein
the friction sound reducing member is formed of a strip shaped
member arranged along the extending direction of the connection
portion.
13. A liquid crystal panel module according to claim 11, wherein
the friction sound reducing member is made of non-woven fabric or
rubber.
14. A liquid crystal panel module according to claim 11, wherein
the pushing members are formed on side wall plates which cover the
electrode portions from above.
15. A liquid crystal panel module according to claim 14, wherein
electrode support bases on which the connection portion and the
electrode fittings are mounted are arranged between the base and
the connection portions.
16. A liquid crystal panel module according to claim 15, wherein
the electrode support bases and the side wall plates are fixed to
the base using screws.
17. A liquid crystal panel module according to claim 11, wherein
grooves are formed at positions of the base side which face the
pushing members.
18. A liquid crystal panel module according to claim 14, wherein
the side wall plates are arranged with inclination spreading at an
obtuse angle with respect to a surface of the base, and a light
reflecting function is imparted to
liquid-crystal-display-panel-side surfaces of the side wall
plates.
19. A liquid crystal panel module according to claim 11, wherein
the electrode fittings are formed between the pair of connection
portions which extends in parallel to each other, and are divided
in plural numbers.
20. A liquid crystal panel module according to claim 11, wherein
the electrode fittings and the connection portions are formed of a
conductive member.
Description
[0001] The present application claims priority from Japanese
application JP2007-018817 filed on Jan. 30, 2007, the content of
which is hereby incorporated by reference into this
application.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a liquid crystal display
device, and more particularly to a liquid crystal display device
having a so-called direct-type backlight.
[0004] 2. Description of the Related Art
[0005] With respect to a liquid crystal display device, along with
a demand for large-sizing of a liquid crystal display panel, as a
backlight, a direct-type backlight which can make a planar light
source uniform has been used.
[0006] In such a backlight, in a plane of the base having a light
reflection function which faces the liquid crystal display panel in
an opposed manner, a plurality of fluorescent lamps is arranged in
the direction orthogonal to the longitudinal direction of the
fluorescent lamps. These respective fluorescent lamps have
electrode portions formed on both ends thereof clamped by electrode
fittings, and the electrode fittings are arranged at both ends of
the base.
[0007] Further, a plurality of electrode fittings is formed on an
electrode support member made of a strip-shaped conductive material
extending in the parallel-arranged direction of the fluorescent
lamps. That is, the electrode support member has a function of
clamping a plurality of fluorescent lamps.
[0008] Accordingly, the plurality of fluorescent lamps in the
inside of the backlight is configured to be connected in parallel
by means of the electrode support members and the electrode
fittings arranged at both ends of the base.
[0009] The liquid crystal display device having such a backlight
is, for example, disclosed in the following patent document 1.
JP-A-2005-347259 corresponding to US2005/0265047A1 relevant to
JP-A-2005-347259
SUMMARY OF THE INVENTION
[0010] However, in the liquid crystal display device having such a
constitution, the electrode support member is made of a relatively
elongated strip-shape material and hence, an expansion ratio due to
heat from the fluorescent lamps becomes large whereby when the
electrode support member is firmly fixed to the base side by a
chance, the electrode support member is liable to be easily
deflected between these fixed portions.
[0011] Accordingly, an attempt has been made to provide the
electrode support member constituted such that the electrode
support member is relatively loosely fixed to the base to allow the
extension of the electrode support member even when the thermal
expansion is generated, and the electrode support member is pushed
to the base side using other member formed separately from the
base.
[0012] However, when the electrode support member is constituted in
such a manner, a contact between the electrode support member and
the above-mentioned other member cannot be avoided and hence, when
the electrode support member is extended due to the thermal
expansion, there arises a drawback that a squeal occurs between the
electrode support member and other member.
[0013] Accordingly, it is an object of the present invention to
provide a liquid crystal display device which can reduce the
occurrence of such a squeal.
[0014] To briefly explain the summary of typical inventions among
the inventions disclosed in this specification, they are as
follows.
[0015] According to one aspect of the present invention, there is
provided a liquid crystal display device including, for example, a
liquid crystal display panel and a backlight arranged on a back
surface of the liquid crystal display panel, wherein the backlight
includes a base, a plurality of rod-shaped light sources arranged
between the liquid crystal display panel and the base, electrode
fittings for supporting electrode portions of the respective
rod-shaped light sources, connection portions allowing the
plurality of electrode fittings to be connected thereto and
extending in the direction orthogonal to the longitudinal direction
of the rod-shaped light sources, pushing members for pushing the
connection portions toward a base side, and friction sound reducing
members arranged between the connection portions and the pushing
members and/or between the connection portions and the base
side.
[0016] According to another aspect of the present invention, there
is provided a liquid crystal panel module including a liquid
crystal display panel and a backlight arranged on a back surface of
the liquid crystal display panel, wherein the backlight includes a
base having a rectangular shape, a plurality of rod-shaped light
sources arranged between the liquid crystal display panel and the
base, electrode fittings for supporting electrode portions of the
respective rod-shaped light sources, connection portions allowing
the plurality of electrode fittings to be connected thereto and
extending along short sides of the base, pushing members for
pushing the connection portions toward a base side, and friction
sound reducing members arranged between the connection portions and
the pushing members and/or between the connection portions and the
base side.
[0017] Here, the present invention is not limited to the
above-mentioned constitution, and various modifications can be made
without departing from the technical concept of the present
invention.
[0018] According to the liquid crystal display device having such a
constitution, it is possible to reduce the occurrence of a
squeal.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a constitutional view of an essential part showing
one embodiment of a liquid crystal display device according to the
present invention, and also is a view for explaining electrode
support members provided with electrode fittings for supporting
electrode portions of external electrode fluorescent lamps and
non-woven fabrics arranged above connection portions of the
electrode support members;
[0020] FIG. 2 is a schematic constitutional view showing one
embodiment of the liquid crystal display device according to the
present invention;
[0021] FIG. 3 is a cross-sectional view of a liquid crystal display
device formed into a module;
[0022] FIG. 4A and FIG. 4B are constitutional views showing one
embodiment of a backlight provided to the liquid crystal display
device according to the present invention, wherein FIG. 4A is a
plan view of the backlight, and FIG. 4B is a cross-sectional view
taken along a line b-b in FIG. 4A;
[0023] FIG. 5 is a plan view showing one embodiment of the
electrode support members provided with the electrode fittings for
supporting the electrode portions of the external electrode
fluorescent lamps in the liquid crystal display device according to
the present invention;
[0024] FIG. 6A and FIG. 6B are views showing the electrode support
members and the electrode fittings, wherein FIG. 6A is an enlarged
view of the electrode support members, and FIG. 6B is a
cross-sectional view taken along a line b-b in FIG. 6A showing a
cross section of the electrode fitting;
[0025] FIG. 7 is an explanatory view showing a state in which the
electrode support member is pushed by a rib of a side wall plate
toward a base side by way of the non-woven fabric;
[0026] FIG. 8A and FIG. 8B are perspective views showing an
electrode support base on which the electrode support member is
mounted and the side wall plate on which the ribs are formed
respectively;
[0027] FIG. 9 is a cross-sectional view of the liquid crystal
display device formed into the module taken along a vertical plane
parallel to the external electrode fluorescent lamps; and
[0028] FIG. 10A to FIG. 10C are explanatory views showing another
embodiments of the liquid crystal display device according to the
present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0029] Hereinafter, an embodiment of a liquid crystal display
device according to the present invention is explained in
conjunction with drawings.
[0030] FIG. 2 is a schematic constitutional view showing one
embodiment of the liquid crystal display device according to the
present invention.
[0031] First of all, as viewed from a viewer's side, a liquid
crystal display panel PNL, an optical sheet OS and a backlight BL
are sequentially arranged.
[0032] The liquid crystal display panel PNL is configured such that
a pair of substrates SUB1, SUB2 which is arranged in parallel and
is made of glass, for example, forms an envelope, and liquid
crystal is interposed between the respective substrates SUB1,
SUB2.
[0033] On a liquid-crystal-side surface of the substrate SUB1 or
SUB2, pixels arranged in a matrix array (not shown in the drawing)
are formed in a state that liquid crystal forms one constitutional
element of the pixel, and each pixel can control light
transmissivity of the liquid crystal.
[0034] Further, a region on which the respective pixels are formed
is referred to as a liquid crystal display region AR (a region
surrounded by a chained line frame in the drawing), light from a
backlight BL described later is radiated to a whole area of the
liquid crystal display region AR, and a viewer is allowed to
recognize an image using light which passes through the respective
pixels.
[0035] Here, the substrate SUB1 arranged at a rear side from a
viewer's side has an area larger than an area of the substrate
SUB2, and a semiconductor device SCD formed of a circuit for
independently driving the respective pixels is mounted on a
periphery of the substrate SUB1 exposed from the substrate
SUB2.
[0036] Here, the semiconductor device SCD may be mounted not only
on the substrate SUB1 but also on a flexible printed circuit board
connected to the substrate SUB2.
[0037] On a back surface of the liquid crystal display panel PNL,
for example, a backlight BL is arranged by way of an optical sheet
OS such as a diffusion sheet, a prism sheet or a stacked body of
these sheets. The optical sheet OS is provided for guiding light
from the backlight BL to a liquid-crystal-display-panel-PNL side by
diffusing or condensing light.
[0038] The backlight BL is a co-called direct-type backlight, and
is constituted of a liquid crystal display panel PNL, a plurality
of, for example, external electrode fluorescent lamps EFL arranged
in parallel to each other in a plane parallel to the liquid crystal
display panel PNL, and a base BS supporting these external
electrode fluorescent lamps EFL and, at the same time, having a
reflection surface for guiding light from the external electrode
fluorescent lamps EFL to a liquid-crystal-display-panel-PNL side.
The base BS includes side wall plates BW and side wall plates BWh
on four side portions thereof, and constitutes a box together with
the side wall plates BW and the side wall plates BWh. The
respective external electrode fluorescent lamps EFL, for example,
have the longitudinal direction thereof directed in the x direction
in the drawing, and are arranged in parallel to each other in the y
direction in the drawing. The constitution of the backlight BL is
explained in detail later.
[0039] Further, the liquid crystal display panel PNL, the optical
sheet OS and the backlight BL are accommodated in the inside of a
frame FR and constitute a liquid crystal display device formed into
a module. FIG. 3 is a cross-sectional view of the liquid crystal
display device formed into a module and shows a cross section of a
portion corresponding to a line III-III in FIG. 2. In the frame FR,
on a viewer's side, an opening OP which exposes the liquid crystal
display region AR of the liquid crystal display panel PNL is
formed. In the frame FR, the liquid crystal display panel PNL, the
optical sheet OS and the backlight BL are positioned and stored
with sufficient accuracy.
[0040] FIG. 4A is a plan view showing only the backlight BL, and
FIG. 4B is a cross-sectional view taken along a line b-b in FIG.
4A.
[0041] In FIG. 4A, the side wall plates BW and the side wall plates
BWh are arranged with inclination spreading at an obtuse angle with
respect to a surface of a bottom plate BB.
[0042] Further, with respect to the base BS and the respective side
wall plates BW, BWh, surfaces of these parts on a
liquid-crystal-display-panel-PNL-side are treated to possess a
light reflecting function. Accordingly, out of light emitted from
the external electrode fluorescent lamps EFL, light radiated in the
directions other than the direction toward the liquid crystal
display panel PNL is reflected on the base BS and the side wall
plates BW, BWh and is directed toward the liquid crystal display
panel PNL.
[0043] Each external electrode fluorescent lamp EFL has an
electrode TM at respective ends thereof, and these electrodes TM
are positioned below the side wall plates BWh through respective
holes HL formed in the side wall plates BWh arranged to face each
other in an opposed manner in the x direction in the drawing.
[0044] The respective electrodes TM of each external electrode
fluorescent lamp EFL are clamped by (engaged with) electrode
fittings TMF mounted on the base BS below the side wall plate BWh.
Due to such a constitution, each external electrode fluorescent
lamp EFL is supported on the base BS by the electrode fittings TMF
and, at the same time, a power source is supplied to the external
electrode fluorescent lamp EFL through the electrode fittings
TMF.
[0045] The electrode fittings TMF are formed on electrode support
members TMS1, TMS2 respectively arranged on both end sides of the
respective external electrode fluorescent lamps EFL. FIG. 5 is a
plan view showing the above-mentioned electrode support members
TMS1, TMS2.
[0046] In FIG. 5, one electrode support member TMS1 is arranged on
a left side (in the drawing) of a region where the external
electrode fluorescent lamps EFL are arranged (indicated by a dotted
line in the drawing), and another electrode support member TMS2 is
arranged on a right side (in the drawing) of the region. These
electrode support members TMS1, TMS2 are respectively configured to
extend in the y direction.
[0047] That is, the electrode support member TMS1 supports portions
of the electrodes TM at left ends (in the drawing) of the
respective external electrode fluorescent lamps EFL in common,
while another electrode support member TMS2 supports portions of
the electrodes TM at right ends (in the drawing) of the respective
external electrode fluorescent lamps EFL in common.
[0048] The electrode support members TMS1, TMS2 are respectively
configured such that between a pair of connection portions JC which
extends in parallel to each other, an electrode fitting group
formed of a plurality of electrode fittings TMF arranged in
parallel to each other in the direction intersecting these
connection portions JC is arranged and supported in parallel to the
extending direction of the connection portions JC. Further, the
electrode support members TMS1, TMS2 are entirely formed of a
conductive material.
[0049] Further, the electrode support member TMS1 is configured
such that each electrode fitting TMF is arranged in a three-split
manner along the longitudinal direction of the electrode TM of the
external electrode fluorescent lamp EFL on a left side in the
drawing, and the respective split electrode fittings TMF clamp the
electrode TM thus supporting the left side of each external
electrode fluorescent lamp EFL. In the same manner, the electrode
support member TMS2 is configured such that each electrode fitting
TMF is arranged in a three-split manner along the longitudinal
direction of the electrode TM of the external electrode fluorescent
lamp EFL on a right side in the drawing, and the respective split
electrode fittings TMF clamp the electrode TM thus supporting the
right side of each external electrode fluorescent lamp EFL. The
reason that the electrode fitting TMF is split in three is that
when at least one electrode fitting TMF exhibits an insufficient
electrical contact, a sufficient electrical contact can be ensured
by other remaining electrode fittings TMF.
[0050] Further, these electrode support members TMS1, TMS2 are
formed by press-forming a sheet material, for example.
[0051] FIG. 6A is an enlarged view depicted by extracting a portion
of a dotted frame A shown in FIG. 5. In FIG. 6A, the electrode
support member TMS1 includes a base portion BP which fixes three
electrode fittings TMF arranged in parallel to each other thereto
in common and a left-side connection portion JC(L) and a right-side
connection portion JC(R) connected to both ends of the base portion
BP. As viewed in a plan view, the plurality of base portions BP and
the respective connection portions JC(L), JC(R) form a
ladder-shaped pattern. On respective connection portions JC(L),
JC(R), anon-woven fabric CLT described later is mounted. In FIG. 5,
the non-woven fabric CLT is not shown.
[0052] Further, FIG. 6B is a cross-sectional view taken along a
line b-b in FIG. 6A showing the electrode fitting TMF.
[0053] The electrode fitting TMF is formed into the bifurcated
structure which includes a pair of opposedly facing tongues for
clamping the external electrode fluorescent lamp EFL from both
sides. That is, the electrode fitting TMF includes a pair of
support portions SP bent in the vertical direction, for example,
from both sides of the base portion BP of the electrode support
member TMS1, and these respective support portions SP have an
arcuate portion which pushes a peripheral surface of the external
electrode fluorescent lamp EFL.
[0054] Further, the electrode fitting TMF includes introduction
portions IN. These introduction portions IN facilitate the
introduction of the external electrode fluorescent lamp EFL into
the electrode fitting TMF.
[0055] A circle indicated by a dotted line in FIG. 6B indicates the
peripheral surface of the external electrode fluorescent lamp
EFL.
[0056] Returning to FIG. 6A, on the left-side connection portion
JC(L) of the electrode support member TMS1, projection portions ST
are mounted in an erected manner at portions where the left-side
connection portion JC(L) intersects the base portions BP in the
extending direction (x direction in the drawing) of the base
portions BP. The projection portions ST are provided for
restricting the movement of the external electrode fluorescent
lamps EFL in the longitudinal direction (x direction).
[0057] The electrode support member TMS2 which forms the pair with
the electrode support member TMS1 has the substantially equal
constitution although the left-and-right relationship in the
drawing becomes opposite.
[0058] Here, the electrode support members TMS1, TMS2 are pushed
toward the base BS side by ribs RB described later which are formed
on back surfaces of the side wall plates BWh in the extending
direction of the connection portions JC. Due to such a
constitution, fixing of the electrode support members TMS1, TMS2 to
the base BS is guaranteed.
[0059] FIG. 7 is a view showing the electrode fitting TMF as viewed
in the tube-axis direction of the external electrode fluorescent
lamp EFL. FIG. 7 shows a state in which the electrode support
member TMS (particularly, a portion of the connection portion JC)
is pushed to the base BS side by the rib RB integrally formed with
the back surface side (a surface side opposite to the liquid
crystal display panel PNL) of the side wall plate BWh. That is, the
rib RB is configured to function as a pushing member for pushing
the electrode support member TMS to the base BS side.
[0060] In this case, a groove GT is formed in a portion of the base
BS which faces the rib RB in an opposed manner. The groove GT is
provided for enhancing the reliability of pushing of the electrode
support member TMS by the rib RB toward the base BS. However, it is
not always necessary to form such a groove GT.
[0061] In this embodiment, for preventing the direct contact of the
rib RB with the electrode support member TMS (particularly the
portion of the connection portion JC), the non-woven fabric CLT is
mounted on the connection portion JC of the electrode support
member TMS and the rib RB is brought into contact with the
non-woven fabric CLT. That is, pushing of the electrode support
member TMS toward the base BS by the rib RB is performed by way of
the non-woven fabric CLT.
[0062] When the electrode support member TMS and the rib RB move
from each other due to the thermal expansion of the electrode
support member TMS or the like, the rib RB is directly brought into
contact with the electrode support member TMS (particularly the
portion of the connection portion JC) and hence, a friction sound
occurs between the connection portion JC and the rib RB as a
squeal. The non-woven fabric CLT performs a function of reducing
the friction sound which occurs between the connection portion JC
and the rib RB thus obviating the occurrence of the squeal
attributed to the thermal expansion of the electrode support member
TMS.
[0063] FIG. 5 is a view corresponding to FIG. 1 and shows that the
strip-shaped non-woven fabric CLT is placed above the connection
portions JC of the respective electrode support members TMS1, TMS2
along the extending direction of the connection portions JC. In
FIG. 1, the arrangement positions of the ribs RB integrally formed
with the side wall plates BWh (not shown in the drawing) are
indicated by a dotted frame.
[0064] As described above, the electrode support member TMS
(particularly the portion of the connection portion JC) is pushed
toward the base BS side by the rib RB by way of the non-woven
fabric CLT.
[0065] Pushing of the electrode support member TMS (particularly
the portion of the connection portion JC) toward the base BS side
by the rib RB is performed by fixing (or temporarily fixing) the
side wall plates BWh to the base BS as described later.
[0066] As shown in FIG. 1, the ribs RB are arranged in parallel to
each other in the y direction in the drawing such that the ribs RB
are arranged alternately with the electrode fittings TMF of the
electrode support member TMS with the electrode fitting TMF
sandwiched between the ribs RB.
[0067] In the above-mentioned embodiment, for facilitating the
understanding of the invention, the explanation is made with
respect to the case that the electrode support member TMS is
directly mounted on the base BS.
[0068] However, as shown in FIG. 8A, the electrode support member
TMS may be configured to be mounted on an electrode support base
TMT formed as a member separate from the base BS.
[0069] Here, a side wall plate BWh provided with the ribs RB may be
fitted into the electrode support base TMT, and the electrode
support base TMT and the side wall plates BWh formed into a module
by such fitting may by fixed to the base BS using screws, for
example.
[0070] That is, FIG. 8B is a perspective view showing the side wall
plate BWh as viewed from a surface side of the side wall plate BWh
on which the ribs RB are formed. The side wall plate BWh is fitted
into the electrode support base TMT by reversing front and back
surfaces of the side wall plate BWh from a state shown in FIG. 8B
and by further reversing the side wall plate BWh in a lateral
direction, and by applying the side wall plate BWh to the electrode
support base TMT shown in FIG. 8A.
[0071] Here, in such a fitted state, the electrode support member
TMS is pushed toward the electrode support base TMT side by the rib
RB of the side wall plates BWh by way of the non-woven fabric
CLT.
[0072] Further, screw holes SCH arranged in parallel in the
longitudinal direction are formed in the electrode support base
TMT. Screw holes SCH' corresponding to the screw holes SCH are also
formed in the side wall plate BWh. These screw holes SCH, SCH' have
center axes thereof aligned with each other when the side wall
plate BWh is fitted into the electrode support base TMT. Further,
the electrode support base TMT and the side wall plate BWh are
fixed to the base BS by screws (not shown in the drawing) threaded
into the base BS through the screw holes SCH, SCH' formed in the
electrode support base TMT and the side wall plate BWh.
[0073] FIG. 9 is a cross-sectional view of the liquid crystal
display device formed into a module by combining a frame FR and the
liquid crystal display panel PNL taken along a vertical plane
parallel to the external electrode fluorescent lamps EFL. FIG. 9
shows a state that the ribs RB formed on the side wall plate BWh
push the connection portion JC by way of the non-woven fabric
CLT.
[0074] In the above-mentioned embodiment, the explanation has been
made with respect to the constitution which mounts the electrode
support member TMS on the electrode support base TMT. As another
embodiment, it is needless to say that the electrode support member
TMS may be directly mounted on the base BS.
[0075] Further, in the above-mentioned embodiment, the non-woven
fabric CLT is interposed between the electrode support member TMS
and the rib RB of the side wall plate BWh as the friction sound
reducing member. However, the non-woven fabric CLT has a function
of reducing a squeal which occurs between the electrode support
member TMS and the rib RB. Accordingly, it is needless to say that
the friction sound reducing member is not limited to the non-woven
fabric CLT and a material made of rubber, for example, may be
used.
[0076] Further, the friction sound reducing member may be any one
selected from a group consisting of a fluoro-rubber resin film, a
film having a surface to which fluorination is applied, a
poly-acetal resin film, a polyethylene film and a silicon coating
film.
[0077] Further, in the above-mentioned embodiment, as shown in FIG.
10A, the non-woven fabric CLT which constitutes the friction sound
reducing member is arranged between the connection portion JC of
the electrode support member TMS and the rib RB of the side wall
plate BW. However, as shown in FIG. 10B, the non-woven fabric CLT
may be arranged between the connection portion JC of the electrode
support member TMS and the base BS side. This is because such a
constitution can reduce the occurrence of a squeal generated
between the connection portion JC and the base BS side.
Accordingly, as shown in FIG. 10C, the non-woven fabric CLT may be
arranged between the connection portion JC and the rib RB as well
as between the connection portion JC and the base BS side
respectively. Here, the term "base BS side" is used because when
the electrode support member TMS is arranged on the electrode
support base TMT, the non-woven fabric CLT may be arranged between
the connection portion JC of the electrode support member TMS and
the electrode support base TMT.
[0078] Further, in the above-mentioned embodiment, as the pushing
member for pushing the electrode support member TMS, the ribs RB
formed on the side wall plate BWh are used. However, the pushing
member is not always limited to the side wall plate BWh and may be
formed of other member fixed to the base BS.
[0079] Further, in the above-mentioned embodiments, the external
electrode fluorescent lamps EFL are used as a light source of the
backlight BL. However, the light source is not limited to the
external electrode fluorescent lamps and may be constituted of
rod-shaped light sources which are similar to the external
electrode fluorescent lamps in shape.
[0080] The above-mentioned respective embodiments may be adopted in
a single form or in combination. This is because the advantageous
effect of the respective embodiments can be acquired independently
or synergistically.
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