U.S. patent application number 16/614361 was filed with the patent office on 2021-10-28 for backlight structure and display panel.
This patent application is currently assigned to Huizhou China Star Optoelectronics Technology Co., Ltd.. The applicant listed for this patent is Huizhou China Star Optoelectronics Technology Co., Ltd.. Invention is credited to Yongyuan QIU.
Application Number | 20210333636 16/614361 |
Document ID | / |
Family ID | 1000005895406 |
Filed Date | 2021-10-28 |
United States Patent
Application |
20210333636 |
Kind Code |
A1 |
QIU; Yongyuan |
October 28, 2021 |
BACKLIGHT STRUCTURE AND DISPLAY PANEL
Abstract
A backlight structure and a display panel. The backlight
structure includes a backlight source, a first optical film and a
second optical film. The backlight source includes a plurality of
sub-millimeter light emitting diodes disposed on the lamp panel.
The first optical film includes a first surface having a plurality
of first light diffusing structures and a second surface having a
plurality of first supporting reflective structures. Projections of
the plurality of first light diffusing structures on the light
panel separates from projections of the plurality of first
supporting reflective structures on the light panel.
Inventors: |
QIU; Yongyuan; (Huizhou,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Huizhou China Star Optoelectronics Technology Co., Ltd. |
Huizhou |
|
CN |
|
|
Assignee: |
Huizhou China Star Optoelectronics
Technology Co., Ltd.
Huizhou
CN
|
Family ID: |
1000005895406 |
Appl. No.: |
16/614361 |
Filed: |
September 19, 2019 |
PCT Filed: |
September 19, 2019 |
PCT NO: |
PCT/CN2019/106562 |
371 Date: |
November 17, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02F 1/133607 20210101;
G02F 1/133608 20130101; G02F 1/133603 20130101; G02F 1/133605
20130101 |
International
Class: |
G02F 1/13357 20060101
G02F001/13357; G02F 1/1335 20060101 G02F001/1335 |
Foreign Application Data
Date |
Code |
Application Number |
May 29, 2019 |
CN |
201910455356.7 |
Claims
1. A backlight structure, wherein the backlight structure
comprises: a backlight source comprising a plurality of
sub-millimeter light emitting diodes disposed on a light panel; a
first optical film disposed above the backlight source; a second
optical film disposed above the first optical film; wherein the
first optical film comprises a first surface adjacent to the
backlight source and a second surface away from the backlight
source, the first surface has a plurality of first light diffusion
structures, and the second surface has a plurality of first
supporting reflective structures, the plurality of first light
diffusing structures are spaced apart from the plurality of first
supporting reflective structures; wherein projections of the
plurality of first light diffusion structures on the light panel
separate from projections of the plurality of first support
reflection structures on the light panel.
2. The backlight structure according to claim 1, wherein the
plurality of first light diffusion structures and the plurality of
sub-millimeter light emitting diodes are correspondingly disposed,
each of the sub-millimeter light emitting diodes is located at a
geometric center of a projection of a first light diffusing
structure corresponding to the sub-millimeter light emitting diode
on the light panel.
3. The backlight structure according to claim 1, wherein each of
the first light diffusing structures corresponds to a light
diffusion range including a plurality of first boundaries, a line
connecting the sub-millimeter light emitting diode and any point on
a boundary of the first light diffusing structure corresponding to
the sub-millimeter light emitting diode constitutes a first
boundary, an angle between the first boundary and a vertical
direction is greater than or equal to 30 degrees.
4. The backlight structure according to claim 3, wherein a cross
section of the plurality of first supporting reflection structures
in a direction perpendicular to a surface of the first optical film
is a triangle; wherein a first side of the triangle is parallel to
a first boundary that is closest to the first side, a second side
of the triangle is parallel to another first boundary that is
closest to the second side.
5. The backlight structure according to claim 4, wherein a surface
of the plurality of first supporting reflective structures has a
reflective coating, and a surface of the reflective coating is a
mirror structure.
6. The backlight structure according to claim 5, wherein the second
optical film comprises a third surface close to the backlight
source and a fourth surface away from the backlight source, the
third surface having a plurality of second light diffusion
structures.
7. The backlight structure according to claim 6, wherein the
plurality of second light diffusion structures and the plurality of
first light diffusion structures are correspondingly disposed;
wherein a geometric center of a projection of the first light
diffusing structure on the light panel overlaps with a geometric
center of a projection of the second light diffusing structure
corresponding to the first light diffusing structure on the light
panel; wherein a boundary of each of the second light diffusion
structures is located on an extension line of the first boundary of
the first light diffusion structure disposed corresponding to the
second light diffusion structure.
8. The backlight structure according to claim 7, wherein the
backlight structure further comprises a plurality of second
supporting reflective structures on the fourth surface, a
projection of the plurality of second light diffusing structures on
the light panel separates from a projection of the plurality of
second supporting reflective structures on the light panel.
9. The backlight structure according to claim 8, wherein the
backlight structure further comprises a third optical film disposed
above the second optical film, the third optical film comprises a
fifth surface close to the backlight source and a sixth surface
away from the backlight source, the fifth surface has a plurality
of third light diffusion structures, and the plurality of third
light diffusion structures and the plurality of first light
diffusion structures are correspondingly disposed; wherein, a
geometric center of a projection of the corresponding first light
diffusion structure on the light panel overlaps with a geometric
center of a projection of the third light diffusion structure on
the light panel; a boundary of each of the third light diffusion
structures is located on an extension line of the first boundary of
the first light diffusion structure disposed corresponding to the
third light diffusion structure.
10. The backlight structure according to claim 1, wherein the
backlight structure further comprises a microlens array under the
first optical film.
11. The backlight structure according to claim 10, wherein the
microlens array comprises a support plate including a seventh
surface close to the backlight source and an eighth surface away
from the backlight source, the seventh surface has a plurality of
light incident structures, and the eighth surface has a plurality
of light emitting structures corresponding to the plurality of
light incident structures, the plurality of light incident
structures and the plurality of light emitting structures
corresponding to the plurality of light incident structures
constitute a plurality of microlens structures; wherein the
plurality of light incident structures are roll-formed on the
seventh surface by a first mold and the plurality of light emitting
structures are roll-formed on the eighth surface by a second
mold.
12. A display panel comprising a backlight structure, wherein the
backlight structure comprises: a backlight source comprising a
plurality of sub-millimeter light emitting diodes disposed on a
light panel; a first optical film disposed above the backlight
source; a second optical film disposed above the first optical
film; wherein the first optical film comprises a first surface
adjacent to the backlight source and a second surface away from the
backlight source, the first surface has a plurality of first light
diffusion structures, and the second surface has a plurality of
first supporting reflective structures, the plurality of first
light diffusing structures are spaced apart from the plurality of
first supporting reflective structures; wherein projections of the
plurality of first light diffusion structures on the light panel
separate from projections of the plurality of first support
reflection structures on the light panel.
13. The display panel according to claim 12, wherein the plurality
of first light diffusion structures and the plurality of
sub-millimeter light emitting diodes are correspondingly disposed,
each of the sub-millimeter light emitting diodes is located at a
geometric center of a projection of a first light diffusing
structure corresponding to the sub-millimeter light emitting diode
on the light panel.
14. The display panel according to claim 12, wherein each of the
first light diffusing structures corresponds to a light diffusion
range including a plurality of first boundaries, a line connecting
the sub-millimeter light emitting diode and any point on a boundary
of the first light diffusing structure corresponding to the
sub-millimeter light emitting diode constitutes a first boundary,
an angle between the first boundary and a vertical direction is
greater than or equal to 30 degrees.
15. The display panel according to claim 14, wherein a cross
section of the plurality of first supporting reflection structures
in a direction perpendicular to a surface of the first optical film
is a triangle; wherein a first side of the triangle is parallel to
a first boundary that is closest to the first side, a second side
of the triangle is parallel to another first boundary that is
closest to the second side.
16. The display panel according to claim 15, wherein a surface of
the plurality of first supporting reflective structures has a
reflective coating, and a surface of the reflective coating is a
mirror structure.
17. The display panel according to claim 16, wherein the second
optical film comprises a third surface close to the backlight
source and a fourth surface away from the backlight source, the
third surface having a plurality of second light diffusion
structures.
18. The display panel according to claim 17, wherein the plurality
of second light diffusion structures and the plurality of first
light diffusion structures are correspondingly disposed; wherein a
geometric center of a projection of the first light diffusing
structure on the light panel overlaps with a geometric center of a
projection of the second light diffusing structure corresponding to
the first light diffusing structure on the light panel; wherein a
boundary of each of the second light diffusion structures is
located on an extension line of the first boundary of the first
light diffusion structure disposed corresponding to the second
light diffusion structure.
19. The display panel according to claim 18, wherein the backlight
structure further comprises a plurality of second supporting
reflective structures on the fourth surface, a projection of the
plurality of second light diffusing structures on the light panel
separates from a projection of the plurality of second supporting
reflective structures on the light panel.
20. The display panel according to claim 19, wherein the backlight
structure further comprises a third optical film disposed above the
second optical film, the third optical film comprises a fifth
surface close to the backlight source and a sixth surface away from
the backlight source, the fifth surface has a plurality of third
light diffusion structures, and the plurality of third light
diffusion structures and the plurality of first light diffusion
structures are correspondingly disposed; wherein, a geometric
center of a projection of the corresponding first light diffusion
structure on the light panel overlaps with a geometric center of a
projection of the third light diffusion structure on the light
panel; a boundary of each of the third light diffusion structures
is located on an extension line of the first boundary of the first
light diffusion structure disposed corresponding to the third light
diffusion structure.
Description
BACKGROUND OF INVENTION
Field of Invention
[0001] The present invention relates to the field of display
technologies, and in particular, to a backlight structure and a
display panel.
Description of Prior Art
[0002] Sub-millimeter light-emitting diodes (mini-LED) greatly
reduce the size of a backlight source in a liquid crystal panel so
that the size of backlight units can be less than 100 micrometers
and the backlight sources can be thinned, miniaturized, and
arrayed. Each pixel of a liquid crystal panel using the mini-LEDs
can be addressed and driven individually.
Technical Problem
[0003] With the development of mini-LEDs, backlight structures of
liquid crystal panels have undergone great changes. In order to
realize thinning of display panel and to meet the user's demand for
multiple partitions of display panel, it is necessary to remove
diffusion plates in a backlight structure of a mini-LED, so that
optical films can be close to or even directly attached to the
mini-LEDs. Therefore, how to ensure light mixing effect of
backlight sources while omitting the diffusion plate has become an
urgent problem to be solved.
SUMMARY OF INVENTION
[0004] The application provides a backlight structure and a display
panel, which can optimize light mixing effect of mini-LED light
panel.
[0005] To solve the above problems, the present application
provides a backlight structure, and the backlight structure
includes:
[0006] a backlight source comprising a plurality of sub-millimeter
light emitting diodes disposed on a light panel;
[0007] a first optical film disposed above the backlight
source;
[0008] a second optical film disposed above the first optical
film;
[0009] wherein the first optical film comprises a first surface
adjacent to the backlight source and a second surface away from the
backlight source, the first surface has a plurality of first light
diffusion structures, and the second surface has a plurality of
first supporting reflective structures, the plurality of first
light diffusing structures are spaced apart from the plurality of
first supporting reflective structures;
[0010] wherein projections of the plurality of first light
diffusion structures on the light panel separate from projections
of the plurality of first support reflection structures on the
light panel.
[0011] According to one aspect of the application, wherein the
plurality of first light diffusion structures and the plurality of
sub-millimeter light emitting diodes are correspondingly disposed,
each of the sub-millimeter light emitting diodes is located at a
geometric center of a projection of a first light diffusing
structure corresponding to the sub-millimeter light emitting diode
on the light panel.
[0012] According to one aspect of the application, wherein each of
the first light diffusing structures corresponds to a light
diffusion range including a plurality of first boundaries, a line
connecting the sub-millimeter light emitting diode and any point on
a boundary of the first light diffusing structure corresponding to
the sub-millimeter light emitting diode constitutes a first
boundary, an angle between the first boundary and a vertical
direction is greater than or equal to 30 degrees.
[0013] According to one aspect of the application, wherein a cross
section of the plurality of first supporting reflection structures
in a direction perpendicular to a surface of the first optical film
is a triangle;
[0014] wherein a first side of the triangle is parallel to a first
boundary that is closest to the first side, a second side of the
triangle is parallel to another first boundary that is closest to
the second side.
[0015] According to one aspect of the application, wherein a
surface of the plurality of first supporting reflective structures
has a reflective coating, and a surface of the reflective coating
is a mirror structure.
[0016] According to one aspect of the application, wherein the
second optical film comprises a third surface close to the
backlight source and a fourth surface away from the backlight
source, the third surface having a plurality of second light
diffusion structures.
[0017] According to one aspect of the application, wherein the
plurality of second light diffusion structures and the plurality of
first light diffusion structures are correspondingly disposed;
[0018] wherein a geometric center of a projection of the first
light diffusing structure on the light panel overlaps with a
geometric center of a projection of the second light diffusing
structure corresponding to the first light diffusing structure on
the light panel;
[0019] wherein a boundary of each of the second light diffusion
structures is located on an extension line of the first boundary of
the first light diffusion structure disposed corresponding to the
second light diffusion structure.
[0020] According to one aspect of the application, wherein the
backlight structure further comprises a plurality of second
supporting reflective structures on the fourth surface, a
projection of the plurality of second light diffusing structures on
the light panel separates from a projection of the plurality of
second supporting reflective structures on the light panel.
[0021] According to one aspect of the application, wherein the
backlight structure further comprises a third optical film disposed
above the second optical film, the third optical film comprises a
fifth surface close to the backlight source and a sixth surface
away from the backlight source, the fifth surface has a plurality
of third light diffusion structures, and the plurality of third
light diffusion structures and the plurality of first light
diffusion structures are correspondingly disposed;
[0022] wherein, a geometric center of a projection of the
corresponding first light diffusion structure on the light panel
overlaps with a geometric center of a projection of the third light
diffusion structure on the light panel;
[0023] a boundary of each of the third light diffusion structures
is located on an extension line of the first boundary of the first
light diffusion structure disposed corresponding to the third light
diffusion structure.
[0024] According to one aspect of the application, wherein the
backlight structure further comprises a microlens array under the
first optical film.
[0025] According to one aspect of the application, wherein the
microlens array comprises a support plate including a seventh
surface close to the backlight source and an eighth surface away
from the backlight source, the seventh surface has a plurality of
light incident structures, and the eighth surface has a plurality
of light emitting structures corresponding to the plurality of
light incident structures, the plurality of light incident
structures and the plurality of light emitting structures
corresponding to the plurality of light incident structures
constitute a plurality of microlens structures;
[0026] wherein the plurality of light incident structures are
roll-formed on the seventh surface by a first mold and the
plurality of light emitting structures are roll-formed on the
eighth surface by a second mold.
[0027] The present application further provides a display panel
comprising a backlight structure, wherein the backlight structure
comprises:
[0028] a backlight source comprising a plurality of sub-millimeter
light emitting diodes disposed on a light panel;
[0029] a first optical film disposed above the backlight
source;
[0030] a second optical film disposed above the first optical
film;
[0031] wherein the first optical film comprises a first surface
adjacent to the backlight source and a second surface away from the
backlight source, the first surface has a plurality of first light
diffusion structures, and the second surface has a plurality of
first supporting reflective structures, the plurality of first
light diffusing structures are spaced apart from the plurality of
first supporting reflective structures;
[0032] wherein projections of the plurality of first light
diffusion structures on the light panel separate from projections
of the plurality of first support reflection structures on the
light panel.
[0033] According to one aspect of the application, wherein the
plurality of first light diffusion structures and the plurality of
sub-millimeter light emitting diodes are correspondingly disposed,
each of the sub-millimeter light emitting diodes is located at a
geometric center of a projection of a first light diffusing
structure corresponding to the sub-millimeter light emitting diode
on the light panel.
[0034] According to one aspect of the application, wherein each of
the first light diffusing structures corresponds to a light
diffusion range including a plurality of first boundaries, a line
connecting the sub-millimeter light emitting diode and any point on
a boundary of the first light diffusing structure corresponding to
the sub-millimeter light emitting diode constitutes a first
boundary, an angle between the first boundary and a vertical
direction is greater than or equal to 30 degrees.
[0035] According to one aspect of the application, wherein a cross
section of the plurality of first supporting reflection structures
in a direction perpendicular to a surface of the first optical film
is a triangle;
[0036] wherein a first side of the triangle is parallel to a first
boundary that is closest to the first side, a second side of the
triangle is parallel to another first boundary that is closest to
the second side.
[0037] According to one aspect of the application, wherein a
surface of the plurality of first supporting reflective structures
has a reflective coating, and a surface of the reflective coating
is a mirror structure.
[0038] According to one aspect of the application, wherein the
second optical film comprises a third surface close to the
backlight source and a fourth surface away from the backlight
source, the third surface having a plurality of second light
diffusion structures.
[0039] According to one aspect of the application, wherein the
plurality of second light diffusion structures and the plurality of
first light diffusion structures are correspondingly disposed;
[0040] wherein a geometric center of a projection of the first
light diffusing structure on the light panel overlaps with a
geometric center of a projection of the second light diffusing
structure corresponding to the first light diffusing structure on
the light panel;
[0041] wherein a boundary of each of the second light diffusion
structures is located on an extension line of the first boundary of
the first light diffusion structure disposed corresponding to the
second light diffusion structure.
[0042] According to one aspect of the application, wherein the
backlight structure further comprises a plurality of second
supporting reflective structures on the fourth surface, a
projection of the plurality of second light diffusing structures on
the light panel separates from a projection of the plurality of
second supporting reflective structures on the light panel.
[0043] According to one aspect of the application, wherein the
backlight structure further comprises a third optical film disposed
above the second optical film, the third optical film comprises a
fifth surface close to the backlight source and a sixth surface
away from the backlight source, the fifth surface has a plurality
of third light diffusion structures, and the plurality of third
light diffusion structures and the plurality of first light
diffusion structures are correspondingly disposed;
[0044] wherein, a geometric center of a projection of the
corresponding first light diffusion structure on the light panel
overlaps with a geometric center of a projection of the third light
diffusion structure on the light panel;
[0045] a boundary of each of the third light diffusion structures
is located on an extension line of the first boundary of the first
light diffusion structure disposed corresponding to the third light
diffusion structure.
Beneficial Effects
[0046] The backlight structure of the present application includes
a first optical film and a second optical film. The first optical
film includes a first surface close to a backlight source and a
second surface away from the backlight source. The first surface
has a plurality of first light diffusing structures, the second
surface has a plurality of first support reflective structures. The
light diffusing structures can reduce brightness of light in a
range of 60 degrees above mini-LEDs, thereby avoiding light
distribution of the light generated by the mini-LED, and optimizing
light mixing effect of the mini-LED. The first supporting
reflective structure serves on the one hand to support the second
optical film and on the other hand to reflect light incident on the
first supporting reflective structure, reducing light loss.
BRIEF DESCRIPTION OF DRAWINGS
[0047] FIG. 1 is a structural diagram of a backlight structure in a
specific embodiment of the present application.
[0048] FIG. 2 is a structural diagram of a backlight structure in
another embodiment of the present application.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0049] Description of following embodiment, with reference to
accompanying drawings, is used to exemplify specific embodiments
which may be carried out in the present disclosure. Directional
terms mentioned in the present disclosure, such as "top", "bottom",
"front", "back", "left", "right", "inside", "outside", "side",
etc., are only used with reference to orientation of the
accompanying drawings. Therefore, the directional terms are
intended to illustrate, but not to limit, the present disclosure.
In the drawings, components having similar structures are denoted
by same numerals.
[0050] The application provides a backlight structure and a display
panel, which can optimize the light mixing effect of the mini-LED
light panel. Referring to FIG. 1, FIG. 1 is a structural diagram of
a backlight structure according to an embodiment of the present
application. The backlight structure includes a backlight source, a
first optical film 100 and a second optical film 200.
[0051] The backlight source includes a plurality of sub-millimeter
light emitting diodes 400 disposed on a light panel 500.
Preferably, the backlight source comprises a plurality of light
panels 500, the light panel 500 is a strip light board, and the
plurality of sub-millimeter light emitting diodes 400 are arranged
in a strip shape in a first direction. The plurality of light
panels 500 are arranged in a second direction, the second direction
is perpendicular to the first direction.
[0052] In the present application, the first optical film 100 is
located above the backlight source. Wherein the first optical film
100 includes a first surface adjacent to the backlight source and a
second surface away from the backlight source, the first surface
has a plurality of first light diffusion structures 110, and the
second surface has a plurality of first supporting reflective
structures 120, the plurality of first light diffusing structures
110 are spaced apart from the plurality of first supporting
reflective structures 120.
[0053] The light diffusing structures can reduce brightness of
light in a range of 60 degrees above mini-LEDs, thereby avoiding
light distribution of the light generated by the mini-LED, and
optimizing light mixing effect of the mini-LED. Surfaces of the
plurality of first light diffusing structures 110 are provided with
uneven structures, and the uneven structures can effectively
disperse the propagation direction of the light emitted by the
mini-LED, so that the light can be distributed in different
directions. In the present application, the plurality of first
light diffusing structures 110 may be formed by particle coating or
imprinting.
[0054] In this embodiment, in order to prevent the plurality of
first light diffusing structures 110 from blocking the light
emitted by the sub-millimeter light emitting diode 400, projections
of the plurality of first light diffusion structures 110 on the
light panel 500 separate from projections of the plurality of first
support reflection structures 120 on the light panel 500.
[0055] In this embodiment, in order to obtain the best light
diffusion effect, the plurality of first light diffusion structures
110 and the plurality of sub-millimeter light emitting diodes 400
are correspondingly disposed, each of the sub-millimeter light
emitting diodes 400 is located at a geometric center of a
projection of a first light diffusing structure 110 corresponding
to the sub-millimeter light emitting diode on the light panel
500.
[0056] In this embodiment, each of the first light diffusing
structures 110 corresponds to a light diffusion range including a
plurality of first boundaries, a line connecting the sub-millimeter
light emitting diode 400 and any point on a boundary of the first
light diffusing structure 110 corresponding to the sub-millimeter
light emitting diode 400 constitutes a first boundary, an angle
between the first boundary and a vertical direction is greater than
or equal to 30 degrees.
[0057] In this embodiment, a cross section of the plurality of
first supporting reflection structures 120 in a direction
perpendicular to a surface of the first optical film 100 is a
triangle. A first side of the triangle is parallel to a first
boundary that is closest to the first side, a second side of the
triangle is parallel to another first boundary that is closest to
the second side.
[0058] In other embodiments of the present application, a cross
section of the plurality of first supporting reflection structures
120 in a direction perpendicular to a surface of the first optical
film 100 is a trapezoid. A first side waist of the trapezoid is
parallel to a first boundary that is closest to the first waist,
and the second side waist of the trapezoid is parallel to another
first boundary that is closest to the first side waist.
[0059] In this embodiment, a surface of the plurality of first
supporting reflective structures 120 has a reflective coating, and
a surface of the reflective coating is a mirror structure. The
reflective coating is capable of reflecting light incident on the
first supporting reflective structure 120 above the first optical
film, prevent the backlight light from being absorbed by the first
supporting reflective structure 120 and improve the light
utilization efficiency of the backlight source. The mirror
structure can further enhance the reflection effect of the first
support reflection structure 120.
[0060] In the present application, the second optical film 200 is
located above the first optical film 100. The second optical film
200 comprises a third surface close to the backlight source and a
fourth surface away from the backlight source, the third surface
having a plurality of second light diffusion structures 210.
[0061] In this embodiment, the plurality of second light diffusion
structures 210 and the plurality of first light diffusion
structures 110 are correspondingly disposed. A geometric center of
a projection of the first light diffusing structure 110 on the
light panel 500 overlaps with a geometric center of a projection of
the second light diffusing structure 210 corresponding to the first
light diffusing structure on the light panel. A boundary of each of
the second light diffusion structures is located on an extension
line of the first boundary of the first light diffusion structure
disposed corresponding to the second light diffusion structure.
[0062] A light diffusion range of the second light diffusion
structure 210 is larger than a light diffusion range of the first
light diffusion structure 110, and the light that penetrates the
first optical film can be further optimized to achieve a better
light mixing effect.
[0063] In this embodiment, in order to further optimize the light
mixing effect, the backlight structure further includes a plurality
of second supporting reflective structures on the fourth surface
and a third optical film disposed above the second optical
film.
[0064] A projection of the plurality of second light diffusing
structures 210 on the light panel 500 separates from a projection
of the plurality of second supporting reflective structures 220 on
the light panel 500.
[0065] The third optical film 300 comprises a fifth surface close
to the backlight source and a sixth surface away from the backlight
source, the fifth surface has a plurality of third light diffusion
structures 310, and the plurality of third light diffusion
structures 310 and the plurality of first light diffusion
structures 110 are correspondingly disposed. Wherein a geometric
center of a projection of the corresponding first light diffusion
structure 110 on the light panel 500 overlaps with a geometric
center of a projection of the third light diffusion structure 310
on the light panel 500. A boundary of each of the third light
diffusion structures 310 is located on an extension line of the
first boundary of the first light diffusion structure 110 disposed
corresponding to the third light diffusion structure 310.
[0066] Referring to FIG. 2, FIG. 2 is a schematic structural
diagram of a backlight structure in another embodiment of the
present application. In this embodiment, the backlight structure
further includes a microlens array 600 under the first optical film
100. The microlens array 600 is isolated from the first optical
film 100 by a third support reflective structure 620.
[0067] The microlens array includes a support plate including a
seventh surface close to the backlight source and an eighth surface
away from the backlight source, the seventh surface has a plurality
of light incident structures, and the eighth surface has a
plurality of light emitting structures corresponding to the
plurality of light incident structures, the plurality of light
incident structures and the plurality of light emitting structures
corresponding to the plurality of light incident structures
constitute a plurality of microlens structures. Wherein the
plurality of light incident structures are roll-formed on the
seventh surface by a first mold and the plurality of light emitting
structures are roll-formed on the eighth surface by a second
mold.
[0068] Correspondingly, the present application also provides a
display panel comprising a backlight structure as described
above.
[0069] The backlight structure of the present application includes
a first optical film and a second optical film. The first optical
film includes a first surface close to a backlight source and a
second surface away from the backlight source. The first surface
has a plurality of first light diffusing structures, the second
surface has a plurality of first support reflective structures. The
light diffusing structures can reduce brightness of light in a
range of 60 degrees above mini-LEDs, thereby avoiding light
distribution of the light generated by the mini-LED, and optimizing
light mixing effect of the mini-LED. The first supporting
reflective structure serves on the one hand to support the second
optical film and on the other hand to reflect light incident on the
first supporting reflective structure, reducing light loss.
[0070] As is understood by persons skilled in the art, the
foregoing preferred embodiments of the present disclosure are
illustrative rather than limiting of the present disclosure. It is
intended that they cover various modifications and that similar
arrangements be included in the spirit and scope of the present
disclosure, the scope of which should be accorded the broadest
interpretation so as to encompass all such modifications and
similar structures.
* * * * *