U.S. patent application number 14/416782 was filed with the patent office on 2016-06-02 for light guide plate, backlight module, and display device.
This patent application is currently assigned to Shenzhen China Star Optoelectronics Technology Co., Ltd.. The applicant listed for this patent is Shenzhen China Star Optoelectronics Technology Co., Ltd.. Invention is credited to Gege Zhou.
Application Number | 20160154169 14/416782 |
Document ID | / |
Family ID | 52942525 |
Filed Date | 2016-06-02 |
United States Patent
Application |
20160154169 |
Kind Code |
A1 |
Zhou; Gege |
June 2, 2016 |
LIGHT GUIDE PLATE, BACKLIGHT MODULE, AND DISPLAY DEVICE
Abstract
Disclosed is a light guide plate for use in a backlight module.
The light guide plate includes a light incidence surface, a light
exit surface, and a bottom surface opposite to the light exit
surface. The light incidence surface is connected between the
bottom surface and the light exit surface. The light guide plate
has an interior in which an internal chamber is formed and includes
two opposite sidewalls and an end wall that is connected between
the two sidewalls and is substantially parallel to and spaced from
the light incidence surface. The internal chamber include a light
source provided at a connection site between the end wall and each
of the two sidewalls, whereby light that enters through the light
incidence surface and light emitting from the two light sources are
subjected to refraction and/or reflection within the internal
chamber and then project outward through the light exit
surface.
Inventors: |
Zhou; Gege; (Shenzhen,
Guangdong, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Shenzhen China Star Optoelectronics Technology Co., Ltd. |
Shenzhen, Guangdong |
|
CN |
|
|
Assignee: |
Shenzhen China Star Optoelectronics
Technology Co., Ltd.
Shenzhen, Guangdong
CN
|
Family ID: |
52942525 |
Appl. No.: |
14/416782 |
Filed: |
December 16, 2014 |
PCT Filed: |
December 16, 2014 |
PCT NO: |
PCT/CN2014/093938 |
371 Date: |
January 23, 2015 |
Current U.S.
Class: |
349/65 ; 362/606;
362/613 |
Current CPC
Class: |
G02B 6/0055 20130101;
G02B 6/0045 20130101; G02B 6/0088 20130101; G02B 6/0096 20130101;
G02B 6/0068 20130101 |
International
Class: |
F21V 8/00 20060101
F21V008/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 2, 2014 |
CN |
201410723100.7 |
Claims
1. A light guide plate for use in a backlight module, comprising a
light incidence surface, a light exit surface, and a bottom surface
opposite to the light exit surface, the light incidence surface
connected between the bottom surface and the light exit surface,
the light guide plate having an interior in which an internal
chamber is formed, the internal chamber comprising two opposite
sidewalls and an end wall connected between the two sidewalls, the
end wall being substantially parallel to the light incidence
surface and spaced from the light incidence surface, the internal
chamber comprising a light source provided at a connection site
between the end wall and each of the two sidewalls, whereby light
that enters through the light incidence surface and light emitting
from the two light sources are subjected to refraction and/or
reflection within the internal chamber and then project outward
through the light exit surface.
2. The light guide plate as claimed in claim 1, wherein the two
sidewalls and the end wall have surfaces that are curved
surfaces.
3. The light guide plate as claimed in claim 2, wherein the
surfaces of the two sidewalls and the end wall are provided with
reflective coating layers.
4. The light guide plate as claimed in claim 2, wherein the
surfaces of the two sidewalls and the end wall are formed by
arranging a plurality of spherical faces or a plurality of rhombus
faces.
5. The light guide plate as claimed in claim 2, wherein the
surfaces of the two sidewalls and the end wall are formed by
arranging conic bodies.
6. A backlight module, comprising a backplane, a lighting source,
an optic film, and a light guide plate, wherein the light guide
plate comprises a light incidence surface, a light exit surface,
and a bottom surface opposite to the light exit surface, the light
incidence surface connected between the bottom surface and the
light exit surface, the light guide plate having an interior in
which an internal chamber is formed, the internal chamber
comprising two opposite sidewalls and an end wall connected between
the two sidewalls, the end wall being substantially parallel to the
light incidence surface and spaced from the light incidence
surface, the internal chamber comprising a light source provided at
a connection site between the end wall and each of the two
sidewalls, whereby light that enters through the light incidence
surface and light emitting from the two light sources are subjected
to refraction and/or reflection within the internal chamber and
then project outward through the light exit surface; and the light
guide plate is stacked on the backplane, the optic film being
disposed on the light exit surface, the lighting source facing the
light incidence surface of the light guide plate.
7. The backlight module as claimed in claim 6, wherein the
backplane comprises a bottom board and a side board, the light
guide plate being fixed by double-sided adhesive tape to the
backplane.
8. The backlight module as claimed in claim 6, wherein a reflection
plate is arranged between the bottom board and the light guide
plate.
9. The backlight module as claimed in claim 6, wherein the two
sidewalls and the end wall have surfaces that are curved
surfaces.
10. A display device, comprising a backlight module and a liquid
crystal panel, the backlight module comprising backplane, a
lighting source, an optic film, and a light guide plate, wherein
the light guide plate comprises a light incidence surface, a light
exit surface, and a bottom surface opposite to the light exit
surface, the light incidence surface connected between the bottom
surface and the light exit surface, the light guide plate having an
interior in which an internal chamber is formed, the internal
chamber comprising two opposite sidewalls and an end wall connected
between the two sidewalls, the end wall being substantially
parallel to the light incidence surface and spaced from the light
incidence surface, the internal chamber comprising a light source
provided at a connection site between the end wall and each of the
two sidewalls, whereby light that enters through the light
incidence surface and light emitting from the two light sources are
subjected to refraction and/or reflection within the internal
chamber and then project outward through the light exit surface;
the light guide plate is stacked on the backplane, the optic film
being disposed on the light exit surface, the lighting source
facing the light incidence surface of the light guide plate; and
the liquid crystal panel is arranged above the backlight module and
the liquid crystal panel and the optic film are fixed to each other
through double-sided adhesive tape.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the priority of Chinese Patent
Application No. 201410723100.7, entitled "Light Guide Plate,
Backlight Module, and Display Device", filed on Dec. 2, 2014, the
disclosure of which is incorporated herein by reference in its
entirety.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to the field of liquid crystal
displaying technology, and in particular to a light guide plate, a
backlight module, and a display device.
[0004] 2. The Related Arts
[0005] Currently, liquid crystal displays that function as display
components of electronic devices have been widely used in various
electronic products. These electronic products have bezels that are
getting thinner and also, brightness has been increasingly demanded
to be higher, but has at the same time satisfied the requirement
for power saving. A backlight module is an important component of
the liquid crystal displays.
[0006] The backlight module comprises a light guide plate, a mold
frame set around a circumference of the light guide plate, a light
source, a flexible circuit board, and an optic film. The light
source and the flexible circuit board are fixed by light-shielding
adhesive tapes on the light guide plate and the mold frame. For a
side-edge backlight module, the light emitting from the light
source gets into the light guide plate through a side edge of the
light guide plate and then, the light is reflected by the light
guide plate to project out of a light exit surface. A portion of
the light is reflected by a reflection plate so as to project out
through the light exit surface.
[0007] However, in the prior art, when a light beam passes through
the light guide plate to project outward, an amount of 8% of the
light energy is absorbed by the light guide plate and is thus lost
so that the screen brightness is lowered down. The lost light
energy can only be supplemented by using optic films of which the
gain is increased to around 10% and this increases the
manufacturing cost.
SUMMARY OF THE INVENTION
[0008] A technical issue to be addressed in the present invention
is to provide a light guide plate, wherein the light guide plate
can reduce the loss of light energy and thus lower down the
manufacturing cost.
[0009] The present invention also provides a backlight module and a
display device.
[0010] To achieve the above object, the present invention provides
the following technical solutions:
[0011] The present invention provides a light guide plate for use
in a backlight module. The light guide plate comprises a light
incidence surface, a light exit surface, and a bottom surface
opposite to the light exit surface. The light incidence surface is
connected between the bottom surface and the light exit surface.
The light guide plate has an interior in which an internal chamber
is formed. The internal chamber comprises two opposite sidewalls
and an end wall connected between the two sidewalls. The end wall
is substantially parallel to the light incidence surface and spaced
from the light incidence surface. The internal chamber comprises a
light source provided at a connection site between the end wall and
each of the two sidewalls, whereby light that enters through the
light incidence surface and light emitting from the two light
sources are subjected to refraction and/or reflection within the
internal chamber and then project outward through the light exit
surface.
[0012] In the above light guide plate, the two sidewalls and the
end wall have surfaces that are curved surfaces.
[0013] In the above light guide plate, the surfaces of the two
sidewalls and the end wall are provided with reflective coating
layers.
[0014] In the above light guide plate, the surfaces of the two
sidewalls and the end wall are formed by arranging a plurality of
spherical faces or a plurality of rhombus faces.
[0015] In the above light guide plate, the surfaces of the two
sidewalls and the end wall are formed by arranging conic
bodies.
[0016] A backlight module comprises a backplane, a lighting source,
an optic film, and a light guide plate, wherein the light guide
plate comprises a light incidence surface, a light exit surface,
and a bottom surface opposite to the light exit surface, the light
incidence surface connected between the bottom surface and the
light exit surface, the light guide plate having an interior in
which an internal chamber is formed, the internal chamber
comprising two opposite sidewalls and an end wall connected between
the two sidewalls, the end wall being substantially parallel to the
light incidence surface and spaced from the light incidence
surface, the internal chamber comprising a light source provided at
a connection site between the end wall and each of the two
sidewalls, whereby light that enters through the light incidence
surface and light emitting from the two light sources are subjected
to refraction and/or reflection within the internal chamber and
then project outward through the light exit surface; and the light
guide plate is stacked on the backplane, the optic film being
disposed on the light exit surface, the lighting source facing the
light incidence surface of the light guide plate.
[0017] In the above backlight module, the backplane comprises a
bottom board and a side board and the light guide plate is fixed by
double-sided adhesive tape to the backplane.
[0018] In the above backlight module, a reflection plate is
arranged between the bottom board and the light guide plate.
[0019] In the above backlight module, the two sidewalls and the end
wall have surfaces that are curved surfaces.
[0020] A display device comprises a backlight module and a liquid
crystal panel, the backlight module comprising backplane, a
lighting source, an optic film, and a light guide plate, wherein
the light guide plate comprises a light incidence surface, a light
exit surface, and a bottom surface opposite to the light exit
surface, the light incidence surface connected between the bottom
surface and the light exit surface, the light guide plate having an
interior in which an internal chamber is formed, the internal
chamber comprising two opposite sidewalls and an end wall connected
between the two sidewalls, the end wall being substantially
parallel to the light incidence surface and spaced from the light
incidence surface, the internal chamber comprising a light source
provided at a connection site between the end wall and each of the
two sidewalls, whereby light that enters through the light
incidence surface and light emitting from the two light sources are
subjected to refraction and/or reflection within the internal
chamber and then project outward through the light exit surface;
the light guide plate is stacked on the backplane, the optic film
being disposed on the light exit surface, the lighting source
facing the light incidence surface of the light guide plate; and
the liquid crystal panel is arranged above the backlight module and
the liquid crystal panel and the optic film are fixed to each other
through double-sided adhesive tape.
[0021] The present invention provides a light guide plate of a
backlight module, which comprises an internal chamber formed
therein. The internal chamber is provided with a light source at a
side thereof that is distant from the light incidence surface,
whereby light from an external light, when entering through the
light incidence surface, is combined with light from the light
source arranged inside the internal chamber to be subjected to
refraction and/or reflection by the internal chamber and then
project out through a light exit surface. This reduces the amount
of light energy absorbed by the light guide plate itself and also
increases the brightness for the light projecting from the light
exit surface so as to increase the brightness of an image and also
reduce the cost of the light guide plate.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] To more clearly illustrate the technical solutions proposed
in the present invention, a brief description of the drawings that
are necessary for describing embodiments of the present invention
is given below. It is obvious that the drawings that will be
described below show only some embodiments of the present invention
and for those having ordinary skills of the art, other drawings may
also be readily available from these attached drawings without the
expense of creative effort and endeavor.
[0023] FIG. 1 is a schematic view showing the structure of a light
guide plate according to a preferred embodiment of the present
invention;
[0024] FIG. 2 is a schematic cross-sectional view showing a
backlight module according to the present invention taken along
line II-II of FIG. 1; and
[0025] FIG. 3 is a schematic cross-sectional view showing a
backlight module of FIG. 1 taken from another direction.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0026] A clear and complete description will be given to technical
solutions of the embodiments of the present invention with
reference to the attached drawings of the embodiments of the
present invention.
[0027] Referring to FIGS. 1, 2, and 3, a preferred embodiment of
the present invention provides a light guide plate 10 for use in a
backlight module. The light guide plate 10 comprises a light
incidence surface 11, a light exit surface 12 and a bottom surface
13 opposite to the light exit surface 12. The light incidence
surface 11 is connected between the bottom surface 13 and the light
exit surface 12. The light guide plate 10 has an interior in which
an internal chamber 15 is formed. The internal chamber 15 comprises
two opposite sidewalls 151 and an end wall 152 connected between
the two sidewalls 151. The end wall 152 is substantially parallel
to the light incidence surface 11 and is spaced from the light
incidence surface 11. The internal chamber 15 comprises a light
source 16 provided at a connection site between the end wall 152
and each of the two sidewalls 151. Light that is incident on and
enters through the light incidence surface 11 and light emitting
from the two light sources 16 are subjected to refraction and/or
reflection within the internal chamber 15 and then project outward
through the light exit surface 12.
[0028] In the instant embodiment, the light guide plate 10 is a
rectangular plate. The light guide plate 10 is integrally formed as
a unitary member having a hollow interior that forms the internal
chamber 15. Two sides of the light guide plate 10 that are parallel
to the two sidewalls 151 are provided with multiple sequentially
arranged receiving slots 16. The receiving slots 16 extend through
the light guide plate for receiving and holding therein light
sources of a backlight module.
[0029] FIG. 1 is a schematic view showing the structure of the
light guide plate according to a preferred embodiment of the
present invention, in which phantom lines indicate a contour of the
internal chamber and a contour of conic bodies that form a curved
surface. Surfaces of the two sidewalls 151 and the end wall 152 are
curved surfaces. And, the surfaces of the two sidewalls 151 and the
end wall 152 are provided with reflective coating layers. The
reflective coating layers enhance reflection effect of the
surfaces.
[0030] The two light sources 16 are light-emitting diodes, which
are respectively mounted at the connection sites between the two
sidewalls 151 and the end wall 152 and emit light that is reflected
or refracted by the surfaces of the two sidewalls 151 and the end
wall 152 to project out through the light exit surface 12 in order
to increase intensity of light guided by the light guide plate.
[0031] Further, the surfaces of the two sidewalls 151 and the end
wall 152 are formed by arranging a plurality of hemispheric faces
or a plurality of rhombus faces. Or alternatively, the surfaces of
the two sidewalls 151 and the end wall 152 are formed by arranging
conic bodies. In the instant embodiment, the surfaces of the two
sidewalls 151 and the end wall 152 comprises curved surfaces formed
by arranging conic bodies 153.
[0032] A preferred embodiment of the present invention also
provides a backlight module. The backlight module comprises a light
guide plate 10, a backplane 20, a lighting source 30, and an optic
film 40. The light guide plate 10 is stacked on the backplane 20.
The optic film 40 is disposed on the light exit surface 12 and is
fixed by a double-sided adhesive tape. The lighting source 30 faces
the light incidence surface 11 of the light guide plate 10. Light
from the lighting source 30 transmits through the two sidewalls 151
of the internal chamber 15 to enter the light guide plate.
[0033] In the instant embodiment, the backplane 20 comprises a
bottom board 21 and a side board 22. The light guide plate 10 is
fixed by double-sided adhesive tape to the backplane 20.
[0034] In the instant embodiment, a reflection plate 23 is arranged
between the bottom board 21 and the light guide plate 10.
[0035] The present invention further provides a display device (not
shown). The display device comprises a backlight module and a
liquid crystal panel. The liquid crystal panel is arranged above
the backlight module and the liquid crystal panel and the optic
film are fixed to each other through double-sided adhesive
tape.
[0036] The present invention provides a light guide plate of a
backlight module, which comprises an internal chamber formed
therein. The internal chamber is provided with a light source at a
side thereof that is distant from the light incidence surface,
whereby light from an external light, when entering through the
light incidence surface, is combined with light from the light
source arranged inside the internal chamber to be subjected to
refraction and/or reflection by the internal chamber and then
project out through a light exit surface. This reduces the amount
of light energy absorbed by the light guide plate itself and also
increases the brightness for the light projecting from the light
exit surface so as to increase the brightness of an image and also
reduce the cost of the light guide plate.
[0037] Disclosed above are only the preferred embodiments of the
present invention. It is appreciated that those having ordinary
skills of the art may readily appreciate various improvements and
modifications without departing from the principle of the present
invention and these improvements and modifications are considered
within the protection scope of the present invention.
* * * * *