U.S. patent application number 14/420374 was filed with the patent office on 2016-05-19 for backlight module and liquid crystal 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 Yong Fan.
Application Number | 20160139319 14/420374 |
Document ID | / |
Family ID | 52902691 |
Filed Date | 2016-05-19 |
United States Patent
Application |
20160139319 |
Kind Code |
A1 |
Fan; Yong |
May 19, 2016 |
BACKLIGHT MODULE AND LIQUID CRYSTAL DISPLAY DEVICE
Abstract
The present invention discloses a backlight module, which
includes: a backplane, which has a sidewall; a light guide plate,
which is carried on the backplane and includes a light incidence
end section, a light exit surface, and a bottom surface opposite to
the light exit surface; a light source, which is mounted on the
sidewall and adjacent to the light incidence end section; an
intermediate frame, which is set on and covers the light guide
plate and the light source; a first retention slot, which is formed
in the light incidence end section and has an opening facing the
intermediate frame; a second retention slot, which is formed in the
light incidence end section and close to the first retention slot
and has an opening facing the backplane; a first quantum dot strip,
which is received in the first retention slot; and a second quantum
dot strip, which is received in the second retention slot. The
present invention also discloses a liquid crystal display device.
The present invention provides an arrangement including quantum dot
strips arranged in the light incidence end section in a top-down
staggering manner, where the manner of fixing is simple and light
emitting from the light source is prevented from directly entering
the light guide plate so as to improve the taste of the color of
the backlighting.
Inventors: |
Fan; Yong; (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: |
52902691 |
Appl. No.: |
14/420374 |
Filed: |
November 19, 2014 |
PCT Filed: |
November 19, 2014 |
PCT NO: |
PCT/CN2014/091692 |
371 Date: |
February 9, 2015 |
Current U.S.
Class: |
349/65 ; 362/608;
362/609 |
Current CPC
Class: |
G02B 6/0023 20130101;
G02B 6/0031 20130101; G02B 6/0073 20130101; G02B 6/0088 20130101;
G02B 6/0026 20130101; G02B 6/0085 20130101 |
International
Class: |
F21V 8/00 20060101
F21V008/00; F21K 99/00 20060101 F21K099/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 14, 2014 |
CN |
201410648594.7 |
Claims
1. A backlight module, comprising: a backplane, which comprises a
sidewall; a light guide plate, which is carried on the backplane
and comprises a light incidence end section, a light exit surface,
and a bottom surface opposite to the light exit surface; a light
source, which is mounted on the sidewall and is adjacent to the
light incidence end section; an intermediate frame, which is set on
and covers the light guide plate and the light source; a first
retention slot, which is formed in the light incidence end section
and has an opening facing the intermediate frame; a second
retention slot, which is formed in the light incidence end section
and close to the first retention slot and has an opening facing the
backplane; a first quantum dot strip, which is received in the
first retention slot; and a second quantum dot strip, which is
received in the second retention slot.
2. The backlight module as claimed in claim 1, wherein the first
retention slot and the second retention slot are arranged to be
parallel to each other.
3. The backlight module as claimed in claim 1, wherein the first
retention slot has an end contacting an inner end of a bottom of
the first retention slot and the first retention slot has an
opposite end that is flush with the light exit surface.
4. The backlight module as claimed in claim 1, wherein the second
retention slot has an end contacting an inner end of a top of the
second retention slot and the second retention slot has an opposite
end that is flush with the bottom surface.
5. The backlight module as claimed in claim 1 further comprising a
first reflection layer, wherein the first reflection film layer is
arranged on a side of the intermediate frame that faces the
backplane, the first reflection film layer having an end positioned
against the sidewall, the first reflection film layer having an
opposite end located between the intermediate frame and the light
guide plate.
6. The backlight module as claimed in claim 1 further comprising a
second reflection layer, wherein the second reflection film layer
is arranged on a side of the backplane that faces the intermediate
frame, the second reflection film layer having an end positioned
against the sidewall.
7. The backlight module as claimed in claim 5 further comprising a
light absorption layer, wherein the light absorption layer is
arranged between the intermediate frame and the light guide plate
and the light absorption layer has an end positioned against the
opposite end of the first reflection film layer.
8. The backlight module as claimed in claim 1, wherein the
backplane comprises a plurality of raised blocks formed on a side
thereof that faces the light guide plate, wherein the light guide
plate is positioned on the raised blocks.
9. The backlight module as claimed in claim 6 further comprising a
reflector plate, wherein the reflector plate is arranged between
the light guide and backplane and the reflector has an end
positioned against an opposite end of the second reflection film
layer.
10. The backlight module as claimed in claim 1 further comprising a
reflector plate, wherein the reflector plate is arranged between
the light guide plate and the backplane.
11. A liquid crystal display device, comprising a backlight module
and a liquid crystal display panel that are arranged to oppose each
other, the backlight module supplying displaying light to the
liquid crystal display panel to allow the liquid crystal display
panel to display images, wherein the backlight module comprises: a
backplane, which comprises a sidewall; a light guide plate, which
is carried on the backplane and comprises a light incidence end
section, a light exit surface, and a bottom surface opposite to the
light exit surface; a light source, which is mounted on the
sidewall and is adjacent to the light incidence end section; an
intermediate frame, which is set on and covers the light guide
plate and the light source; a first retention slot, which is formed
in the light incidence end section and has an opening facing the
intermediate frame; a second retention slot, which is formed in the
light incidence end section and close to the first retention slot
and has an opening facing the backplane; a first quantum dot strip,
which is received in the first retention slot; and a second quantum
dot strip, which is received in the second retention slot.
12. The liquid crystal display device as claimed in claim 11,
wherein the first retention slot and the second retention slot are
arranged to be parallel to each other.
13. The liquid crystal display device as claimed in claim 11,
wherein the first retention slot has an end contacting an inner end
of a bottom of the first retention slot and the first retention
slot has an opposite end that is flush with the light exit
surface.
14. The liquid crystal display device as claimed in claim 11,
wherein the second retention slot has an end contacting an inner
end of a top of the second retention slot and the second retention
slot has an opposite end that is flush with the bottom surface.
15. The liquid crystal display device as claimed in claim 11
further comprising a first reflection layer, wherein the first
reflection film layer is arranged on a side of the intermediate
frame that faces the backplane, the first reflection film layer
having an end positioned against the sidewall, the first reflection
film layer having an opposite end located between the intermediate
frame and the light guide plate.
16. The liquid crystal display device as claimed in claim 11
further comprising a second reflection layer, wherein the second
reflection film layer is arranged on a side of the backplane that
faces the intermediate frame, the second reflection film layer
having an end positioned against the sidewall.
17. The liquid crystal display device as claimed in claim 15
further comprising a light absorption layer, wherein the light
absorption layer is arranged between the intermediate frame and the
light guide plate and the light absorption layer has an end
positioned against the opposite end of the first reflection film
layer.
18. The liquid crystal display device as claimed in claim 11,
wherein the backplane comprises a plurality of raised blocks formed
on a side thereof that faces the light guide plate, wherein the
light guide plate is positioned on the raised blocks.
19. The liquid crystal display device as claimed in claim 16
further comprising a reflector plate, wherein the reflector plate
is arranged between the light guide and backplane and the reflector
has an end positioned against an opposite end of the second
reflection film layer.
20. The liquid crystal display device as claimed in claim 11
further comprising a reflector plate, wherein the reflector plate
is arranged between the light guide plate and the backplane.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to the field of liquid crystal
displaying technology, and in particular to a backlight module and
a liquid crystal display device.
[0003] 2. The Related Arts
[0004] A conventional liquid crystal display device often uses a
white light-emitting diode (LED) as a backlight source, which, when
properly arranged in combination with a light guide plate and an
optic film, could achieve desired backlighting for liquid crystal.
With the increasing demands of people for high color gamut, high
color saturation, and energy saving, the solutions that are
conventionally adopted to achieve white light source, high color
gamut, and high color saturation include: using a violet LED in
combination with red, green, and blue phosphors; using a blue LED
in combination with red and green phosphors; and using a blue LED
together with a green LED and a red LED. All these solutions help
increase color gamut, but they are difficult to put into practice
and costs are high.
[0005] The quantum dot (QD) technique is a technique related to a
structure of a semiconductor nanometer material that confines
electrons in a predetermined range and is composed of extremely
small crystals of chemical compounds having a size ranging 1-100
nm. In the QD technique, crystals of different sizes can be used to
control light wavelength in order to achieve precise control of
light color. Thus, QD materials are used in backlight modules and a
light source of a high frequency spectrum (such as a blue LED) is
used to replace the conventionally used white LED light source.
Being irradiated by lights of high frequencies, the QDs can be
excited to emit lights of different wavelengths. Adjusting the size
of the QD material would allow for adjustment of the color of the
combined light so as to satisfy the demand for backlighting of high
color gamut liquid crystal display modules.
[0006] FIG. 1 shows a known backlight module that uses a quantum
dot phosphor film. Referring to FIG. 1, a blue light-emitting diode
(LED) 11 is arranged at a light incidence side surface of a light
guide plate 12 and a quantum dot phosphor film 13 is arranged on a
light exit surface of the light guide plate 12, wherein light
emitting from the blue LED 11 is converted by the light guide plate
12 into planar light and is projected from the light exit surface
of the light guide plate 12 to pass through the quantum dot
phosphor film 13, where the blue light is converted into
backlighting required for a liquid crystal display device. However,
for a large-sized liquid crystal display device, the quantum dot
phosphor film 13 must be formed as a large area and this requires
an increased amount of quantum dot material. Further, coating of
the quantum dot phosphor layer is subjected to severe requirement
for uniformity and this leads to a high cost. Further, in the use
of the quantum dot phosphor film 13, if the configuration of the
optic film or the model number of the optic film is different, the
light, which is subjected to improvement made by the optic film,
after transmitting through the liquid crystal display panel, shows
great variations in respect of color and brightness and thus,
during the use of the quantum dot phosphor film 13, it is generally
not allowed to change the optic film configuration, the optic film
supplier, or the optic film model number. This imposes limitations
to the flexibility and universality of use of the quantum dot
phosphor optic film.
[0007] FIG. 2 shows another known backlight module that uses a
quantum dot phosphor film. Referring to FIG. 2, a blue LED 21 is
arranged at a light incidence side surface of a light guide plate
22 and a quantum dot phosphor is packaged in a glass tube to form a
quantum dot phosphor contained glass tube 23, wherein the quantum
dot phosphor contained glass tube 23 is disposed between the blue
LED 21 and the light incidence side surface of the light guide
plate 12. The blue LED 11 emits blue light that passes though the
quantum dot phosphor contained glass tube 23 to irradiate the light
incidence side surface of the light guide plate 12. However,
adopting this solution requires a complicated manufacture of the
quantum dot phosphor contained glass tube 23 and the cost is high.
Further, the quantum dot phosphor contained glass tube 23 is
susceptible to breaking.
SUMMARY OF THE INVENTION
[0008] To overcome the above problems of the prior art techniques,
an object of the present invention is to provide a backlight
module, which comprises: a backplane, which comprises a sidewall; a
light guide plate, which is carried on the backplane and comprises
a light incidence end section, a light exit surface, and a bottom
surface opposite to the light exit surface; a light source, which
is mounted on the sidewall and is adjacent to the light incidence
end section; an intermediate frame, which is set on and covers the
light guide plate and the light source; a first retention slot,
which is formed in the light incidence end section and has an
opening facing the intermediate frame; a second retention slot,
which is formed in the light incidence end section and close to the
first retention slot and has an opening facing the backplane; a
first quantum dot strip, which is received in the first retention
slot; and a second quantum dot strip, which is received in the
second retention slot.
[0009] Further, the first retention slot and the second retention
slot are arranged to be parallel to each other.
[0010] Further, the first retention slot has an end contacting an
inner end of a bottom of the first retention slot and the first
retention slot has an opposite end that is flush with the light
exit surface.
[0011] Further, the second retention slot has an end contacting an
inner end of a top of the second retention slot and the second
retention slot has an opposite end that is flush with the bottom
surface.
[0012] Further, the backlight module further comprises a first
reflection layer, wherein the first reflection film layer is
arranged on a side of the intermediate frame that faces the
backplane; the first reflection film layer has an end positioned
against the sidewall; and the first reflection film layer has an
opposite end located between the intermediate frame and the light
guide plate.
[0013] Further, the backlight module further comprises a second
reflection layer, wherein the second reflection film layer is
arranged on a side of the backplane that faces the intermediate
frame and the second reflection film layer has an end positioned
against the sidewall.
[0014] Further, the backlight module further comprises a light
absorption layer, wherein the light absorption layer is arranged
between the intermediate frame and the light guide plate and the
light absorption layer has an end positioned against the opposite
end of the first reflection film layer.
[0015] Further, the backplane comprises a plurality of raised
blocks formed on a side thereof that faces the light guide plate,
wherein the light guide plate is positioned on the raised
blocks.
[0016] Further, the backlight module further comprises a reflector
plate, wherein the reflector plate is arranged between the light
guide and backplane and the reflector has an end positioned against
an opposite end of the second reflection film layer.
[0017] Another object of the present invention is to provide a
liquid crystal display device, which comprises a backlight module
and a liquid crystal display panel that are arranged to oppose each
other. The backlight module supplies displaying light to the liquid
crystal display panel to allow the liquid crystal display panel to
display images, wherein the backlight module is the backlight
module described above.
[0018] The present invention provides that quantum dot strips are
arranged in the light incidence end section of the light guide
plate in a top-bottom staggering manner, where the manner of fixing
is simple and light emitting from the light source is prevented
from entering the light guide plate by directly transmitting
through the light incidence end section of the light guide plate so
as to improve the taste of the color of the backlighting supplied
from the backlight module to the liquid crystal display panel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The above and other aspects, features, and advantages of an
embodiment of the present invention will become more apparent from
the following description given with reference to the attached
drawings. In the drawings:
[0020] FIG. 1 shows a known backlight module that uses a quantum
dot phosphor film;
[0021] FIG. 2 shows another known backlight module that uses a
quantum dot phosphor film;
[0022] FIG. 3 is a schematic view showing a structure of a liquid
crystal display device according to an embodiment of the present
invention; and
[0023] FIG. 4 is a schematic view showing a structure of a
backlight module according to an embodiment of the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] Embodiments of the present invention will be described in
detail with reference to the attached drawings. However, various
different forms may be adopted to embody the present invention and
the interpretation of the present invention should not be limited
to the embodiments described herein. On the contrary, these
embodiments are provided for the purposes of explaining the
principle and practical applications of the present invention in
order to allow other technical persons of the art field to realize
various embodiments of the present invention, as well as various
modifications fit for specific intended uses.
[0025] FIG. 3 is a schematic view showing a structure of a liquid
crystal display device according to an embodiment of the present
invention.
[0026] Referring to FIG. 3, the liquid crystal display device
according to the embodiment of the present invention comprises a
liquid crystal display panel 200 and a backlight module 100 that is
arranged to oppose the liquid crystal display panel 200, wherein
the backlight module 100 supplies displaying light to the liquid
crystal display panel 200 to allow the liquid crystal display panel
200 to display images.
[0027] The liquid crystal display panel 200 commonly comprises a
thin-film transistor (TFT) array substrate 210, a color filter (CF)
substrate 220 that is opposite to the TFT array substrate 210, and
a liquid crystal layer 230 interposed between the TFT array
substrate 210 and the CF substrate 220, wherein the liquid crystal
layer 230 comprises multiple liquid crystal molecules. Since a
specific structure of the liquid crystal display panel 200 of the
instant embodiment is virtually similar to structures of the
conventional liquid crystal display panels, no further details will
be given here.
[0028] A detailed description of a specific structure of the
backlight module 100 according to an embodiment of the present
invention will be given as follows.
[0029] FIG. 4 is a schematic view showing a structure of a
backlight module according to an embodiment of the present
invention.
[0030] Referring to FIG. 4, the backlight module 100 according to
the embodiment of the present invention comprises: a light guide
plate 110, a light source 120, a quantum dot film strip (which will
be briefly referred to as quantum dot strip hereinafter) 130, a
backplane 140, an intermediate frame 150, a first retention slot
160, and a second retention slot 170.
[0031] Specifically, the backplane 140 comprises at least one
sidewall 141. The light guide plate 110 is carried on the backplane
140 and comprises a light incidence end section 111, a light exit
surface 112, and a bottom surface 113 opposite to the light exit
surface 112, wherein the light incidence end section 111 faces the
sidewall 141 of the backplane 140.
[0032] The light source 120 may be for example a light bar composed
of blue light-emitting diodes (LEDs), which is mounted on the
sidewall 141 of the backplane 140 and is adjacent to the light
incidence end section 111 of the light guide plate 110. The
intermediate frame 150 is set on and covers the light guide plate
110 and the light source 120.
[0033] A first retention slot 160 is formed in the light incidence
end section 111 and has an opening facing the intermediate frame
150. A second retention slot 170 is formed in the light incidence
end section 111 and close to the first retention slot 160 and has
an opening facing the backplane 140. In the instant embodiment,
preferably, the first retention slot 160 and the second retention
slot 170 are arranged to be parallel to each other.
[0034] The first quantum dot strip 131 is received in the first
retention slot 160. In the instant embodiment, preferably, the
first quantum dot strip 131 has an end positioned against an inner
wall of a bottom of the first retention slot 160 and the first
quantum dot strip 131 has an opposite end that is flush with the
light exit surface 112. The second quantum dot strip 132 is
received in the second retention slot 170. In the instant
embodiment, preferably, the second quantum dot strip 132 has an end
positioned against an inner wall of a top of the second retention
slot 170 and the second quantum dot strip 132 has an opposite end
that is flush with the bottom surface 113.
[0035] The first quantum dot strip 131 and the second quantum dot
strip 132 can be formed of, for example, a quantum dot phosphor
layer and a transparent external protection layer that encloses the
quantum dot phosphor layer. With the quantum dot phosphor layers of
the first quantum dot strip 131 and the second quantum dot strip
132 being irradiated by the light source 120, the quantum dot
phosphor layers are excited to generate different color lights so
as to form white backlighting desired for the liquid crystal
display panel.
[0036] Further, to improve light coupling efficiency, the backlight
module 100 according to the embodiment of the present invention
further comprises a first reflection layer 181, wherein the first
reflection layer 181 is arranged on the side of the intermediate
frame 150 facing the backplane 140. The first reflection layer 181
has an end positioned against the sidewall 141 of the backplane 140
and the first reflection film layer 181 has an opposite end that is
located between the intermediate frame 150 and the light guide
plate 110.
[0037] In addition, the backlight module 100 according to the
embodiment of the present invention further comprises a second
reflection layer 182, wherein the second reflection layer 182 is
arranged on the side of the backplane 140 facing the intermediate
frame 150 and the second reflection layer 182 has an end positioned
against the sidewall 141 of the backplane.
[0038] In the instant embodiment, the first reflection layer 181
and the second reflection layer 182 may be made of metallic
materials having high reflectance, such as silver; however, the
present invention is not limited to this.
[0039] Further, to prevent light leakage from occurring between the
intermediate frame 150 and the light guide plate 110, in the
instant embodiment, the backlight module 100 according to the
embodiment of the present invention further comprises a light
absorption layer 190, wherein the light absorption layer 190 is
arranged between the intermediate frame 150 and the light guide
plate 110 and the light absorption layer 190 has an end that is
positioned against said opposite end of the first reflection layer
181. The light absorption layer 190 can be for example a black
film, but the present invention is not limited to this.
[0040] To improve overall heat dissipation of the backlight module
100, the backplane 140 can be made of a metallic material having
excellent heat dissipation property and in the instant embodiment,
the backplane 140 is made of aluminum. To further improve heat
dissipation of components, such as the light guide plate 110, in
the instant embodiment, the backplane 140 comprises a plurality of
raised blocks 142 formed on a side thereof that faces the light
guide plate 110. The second reflection layer 182 is arranged on one
of the raised blocks 142 that is immediately adjacent to the
sidewall 141 of the backplane 140. The light guide plate 110 is
positioned on the raised blocks 142 and the light incidence end
section 111 of the light guide plate 110 is positioned on the one
of the raised blocks 142 that is immediately adjacent to the
sidewall 141 of the backplane 140, so that the light guide plate
110 and the backplane 140 form therebetween a gap for further
improving heat dissipation efficiency.
[0041] Further, the backlight module 100 according to the
embodiment of the present invention further comprises a reflector
plate 180, wherein the reflector plate 180 is arranged between the
light guide plate 110 and the raised blocks 142 of the backplane
140 and the reflector plate 180 has an end positioned against an
opposite end of the second reflection layer 182. The reflector
plate 180 functions to reflect light exiting the bottom surface of
the light guide plate 110 back into the light guide plate 110 in
order to improve light utilization of the light guide plate
110.
[0042] In summary, according to the embodiments of the present
invention, quantum dot strips are arranged in the light incidence
end section of the light guide plate in a top-bottom staggering
manner, where the manner of fixing is simple and light emitting
from the light source is prevented from entering the light guide
plate by directly transmitting through the light incidence end
section of the light guide plate so as to improve the taste of the
color of the backlighting supplied from the backlight module to the
liquid crystal display panel.
[0043] Although a description of specific embodiment has been given
to illustrate the present invention, those having ordinary skills
of the art may appreciate that various variations in respect of
forms and details can be made without departing the spirit and
scope of the present invention that are only limited by the
appended claims and the equivalents thereof.
* * * * *