CN104964213A - Backlight module and liquid crystal display - Google Patents

Backlight module and liquid crystal display Download PDF

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Publication number
CN104964213A
CN104964213A CN201510413484.7A CN201510413484A CN104964213A CN 104964213 A CN104964213 A CN 104964213A CN 201510413484 A CN201510413484 A CN 201510413484A CN 104964213 A CN104964213 A CN 104964213A
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CN
China
Prior art keywords
light source
guide plate
light guide
backlight module
reflecting surface
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Granted
Application number
CN201510413484.7A
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Chinese (zh)
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CN104964213B (en
Inventor
曾杰
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to CN201510413484.7A priority Critical patent/CN104964213B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133605Direct backlight including specially adapted reflectors
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133606Direct backlight including a specially adapted diffusing, scattering or light controlling members

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention provides a backlight module. The backlight module comprises an optical film set, a light guide plate, a reflective sheet, a rubber frame, an FPC and a light source which are arranged from top to bottom in sequence. The light source is arranged on the FPC. The rubber frame is arranged on the reflective sheet. The optical film set and the light guide plate are contained in the rubber frame. The inner surface of the rubber frame is provided with an arc-shaped groove. The surface of the arc-shaped groove is provided with a first reflecting surface. The light source is located between the light incident surface of the light guide plate and the rubber frame. The light emergent surface of the light source faces the first reflecting surface. The surface, facing the light source, of the FPC is provided with a second reflecting surface. The light non-emergent surface of the light source is provided with a third reflecting surface. The first reflecting surface, the second reflecting surface and the third reflecting surface jointly form a reflecting cavity. Light rays reflected by the reflecting cavity are mixed evenly and then enter the light guide plate, and dark space is eliminated.

Description

Backlight module and liquid crystal display
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of backlight module and there is the liquid crystal display of described backlight module.
Background technology
Liquid crystal indicator (LCD, Liquid Crystal Display) has that fuselage is thin, power saving, the many merits such as radiationless, be widely used.Liquid crystal indicator major part on existing market is backlight liquid crystal indicator, and it comprises display panels and backlight module (backlight module).The operation principle of display panels places liquid crystal molecule in the middle of the glass substrate that two panels is parallel, there is the tiny electric wire of many vertical and levels in the middle of two panels glass substrate, change direction by whether being energized to control liquid crystal molecule, the light refraction of backlight module is out produced picture.Because display panels itself is not luminous, the light source provided by backlight module is needed to carry out normal show image, therefore, one of backlight module key component becoming liquid crystal indicator.
Refer to Fig. 1, in prior art, backlight module is that multiple for backlight LED 2 interval is positioned over display panels light guide plate 3 (LGP, Light Guide Plate) edge, the light that LED 2 sends enters light guide plate from the incidence surface of light guide plate 3 side, from the injection of light guide plate 3 exiting surface after reflection and diffusion, then via optical diaphragm group, be supplied to display panels with forming surface light source.
At least there are the following problems for this backlight module:
Because LED light source is that interval is placed, such light source has clear zone 5 as shown in Figure 1 and dark space 6 to the light that light guide plate is injected, and causes backlight module light uneven, the serious image quality that have impact on display panels.
Summary of the invention
The object of the present invention is to provide a kind of backlight module, there is the uniform advantage of backlight module distribution of light.
Another object of the present invention is to provide a kind of liquid crystal display adopting above-mentioned backlight module.
To achieve these goals, embodiment of the present invention provides following technical scheme:
Present invention is disclosed a kind of backlight module, comprise the optical diaphragm group set gradually from top to bottom, light guide plate, reflector plate, glue frame, FPC, be located at the light source on described FPC, described glue frame is placed on described reflector plate, described optical diaphragm group and described light guide plate are contained in described glue frame, the inner surface of described glue frame is provided with arc-shaped recess, described arc-shaped recess surface is provided with the first reflecting surface, described light source is between the incidence surface and described glue frame of described light guide plate, the exiting surface of described light source is towards described first reflecting surface, described FPC is provided with the second reflecting surface in the face of the surface of described light source, the non-exiting surface of described light source is provided with the 3rd reflecting surface, described first reflecting surface, described second reflecting surface, described 3rd reflecting surface forms reflection cavity jointly.
Wherein, described light source is fixed in the focus of described arc-shaped recess by rigid wire, and described rigid wire is electrically connected described FPC and described light source.
Wherein, described light source is rectangle, described surface of light source is first surface to described light guide plate, described light source second surface and the 3rd surface are oppositely arranged and are parallel to the plane at described reflecting plate place, described second surface and described 3rd surface are connected between described first surface and described exiting surface, described light source the 4th surface and the 5th surface are oppositely arranged and perpendicular to the plane at described reflecting plate place, described 4th surface and described 5th surface are connected between described first surface and described exiting surface, distance < 3mm between described 4th surface and described 5th surface, the distance < 1mm of described first surface and described exiting surface, distance < 0.4mm between described second surface and described 3rd surface.
Wherein, described FPC part is attached at the side away from described reflector plate of described light guide plate, and another part of described FPC is attached at the side away from described reflector plate of described glue frame.
Wherein, also comprise shading rubber belt, a described shading rubber belt part is attached at the side away from described reflector plate of described light guide plate, another part of described shading rubber belt is attached at the side away from described reflector plate of described glue frame, described shading rubber belt is provided with reflecting surface towards the Lights section between described glue frame and described light guide plate, described FPC part is attached at the side near described reflector plate of described glue frame, and another part of described FPC is attached on described reflector plate.
Wherein, described first reflecting surface, described second reflecting surface and described 3rd reflecting surface form reflecting surface by the mode applying reflecting material.
Wherein, described optical diaphragm group comprises brightening piece on, once brightening piece and a diffusion sheet, and described lower brightening piece is on described between brightening piece and described diffusion sheet, and described diffusion sheet fits in described light guide plate, fits in described upper brightening piece and described viewing area.
Wherein, the outer surface not arranging light source of described light guide plate has reflecting surface, and the light inciding described mirror surface is reflected back in described light guide plate by described reflecting surface.
Wherein, described light guide plate and described reflector plate are seamless contact.
The present invention also discloses a kind of liquid crystal display, comprises above-mentioned backlight module.
Embodiment of the present invention tool has the following advantages or beneficial effect:
In the backlight module of the embodiment of the present invention, adopt and be provided with arc-shaped recess by inside described glue frame, the exiting surface of described light source is towards described arc-shaped recess, and the surface of described light source and the non-exiting surface of described light source are provided with reflecting surface faced by described arc-shaped recess surface, described FPC, described reflecting surface and described reflector plate form the method for reflection cavity jointly, realize the function entering light guide plate after being mixed by the emergent ray of light source, reach the technique effect improving display quality of liquid crystal panel.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that prior art backlight module light source arranges schematic diagram;
Fig. 2 is the backlight module partial cross section schematic diagram of first embodiment of the invention;
Fig. 3 is the backlight module partial cross section schematic diagram of second embodiment of the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 2, as shown in Figure 2, backlight module 100 of the present invention can be LCD backlight module, it comprises optical diaphragm group 20, light guide plate 3 and reflector plate 4, FPC (flexible PCB) 5, light source 6 and glue frame 7, described glue frame 7 is placed on described reflector plate 4, described optical diaphragm group 20 and the stacked setting of described light guide plate 3 are also contained in described glue frame 7, described optical diaphragm group 20 is arranged on described light guide plate 3, for processing the light of the outgoing from light guide plate 3, make from the intensity of the light of backlight module 100 outgoing more greatly and comparatively even, described light guide plate 7 is attached on described reflector plate 4, the inner surface of described glue frame 7 is provided with arc-shaped recess (unnumbered), described arc-shaped recess surface is provided with the first reflecting surface 71, described light source 6 is between the incidence surface 31 and described glue frame 7 of described light guide plate 3, described light source exiting surface 62 is towards described first reflecting surface 71, described FPC 5 is provided with the second reflecting surface 52 in the face of the surface of described light source 6, the non-exiting surface of described light source 6 is provided with the 3rd reflecting surface 63, described first reflecting surface 71, described second reflecting surface 52, described 3rd reflecting surface 63 forms reflection cavity jointly.
Arc-shaped recess is provided with on inside described glue frame 7, the exiting surface of described light source is towards described arc-shaped recess, and the surface of described light source and the non-exiting surface of described light source are provided with reflecting surface faced by described arc-shaped recess surface, described FPC, described reflecting surface and described reflector plate form reflection cavity jointly, enter the function of light guide plate after the emergent ray of light source is mixed, reach the effect improving display quality of liquid crystal panel.
Further, described glue frame 7 is generally made up of flexible material, and this flexible material is preferably PC material (i.e. Merlon).
Preferred further, described light source 6 can be electrically connected by rigid wire and described FPC 5, described light source 6 can be fixed in the focus of described arc-shaped recess by described rigid wire in addition, the light that reflection cavity is penetrated is directional light, light is more even, and display effect is better.
As preferred further, described light source 6 be rectangle, described light source is rectangle, described surface of light source is first surface to described light guide plate, described light source second surface and the 3rd surface are oppositely arranged and are parallel to the plane at described reflecting plate place, described second surface and described 3rd surface are connected between described first surface and described exiting surface 62, described light source the 4th surface and the 5th surface are oppositely arranged and perpendicular to the plane at described reflecting plate place, described 4th surface and described 5th surface are connected between described first surface and described exiting surface, distance < 3mm between described 4th surface and described 5th surface, the distance < 1mm of described first surface and described exiting surface 62, distance < 0.4mm between described second surface and described 3rd surface., adopt undersized light source 6 can reduce the space taken, light can be penetrated from described reflection cavity, thus improve light utilization, and the size of described backlight module 100 can be reduced.
Refer to Fig. 2, as a specific embodiment of the present invention, described FPC 5 is located at the top of described reflector plate 4, described FPC 5 part is attached at the side away from described reflector plate 4 of described light guide plate 3, and another part of described FPC 5 is attached at the side away from described reflector plate 4 of described glue frame 7.
Refer to Fig. 3, in another embodiment of the present invention, described backlight module also comprises shading rubber belt 9, described shading rubber belt 9 part is attached at the side away from described reflector plate 4 of described light guide plate 3, another part of described shading rubber belt 9 is attached at the side away from described reflector plate 4 of described glue frame 7, described shading rubber belt 9 is provided with reflecting surface towards light source 6 part between described glue frame 7 and described light guide plate 3, a part of described FPC 5 is attached at the side of described glue frame 7 near described reflector plate 4, another part of described FPC 5 is attached on described reflector plate 4, FPC 5 between described glue frame 7 and described light guide plate 3, reflecting surface 52 is being provided with in the one side of light source.
In a specific embodiment of the present invention, described FPC part is attached at the side away from described reflector plate of described light guide plate, and another part of described FPC is attached at the side away from described reflector plate of described glue frame.
In embodiments of the present invention, described blooming piece 20 comprises brightening piece 21, lower brightening piece 22 and diffusion sheet 23.Described upper brightening piece 21, described lower brightening piece 22 and described diffusion sheet 23 overlapping arrangement successively from top to bottom, that is, described lower brightening piece 22 is on described between brightening piece 21 and described diffusion sheet 23, and described diffusion sheet 23 fits in described light guide plate 3.
Preferably, described reflector plate 4 for having the reflector plate of high reflectance, for improving the positive brightness of LCD backlight module 100 when certain light source exports.Being understandable that, in order to preferably reduce light leak, the outer surface not arranging light source 6 of described light guide plate 3 can be had reflecting surface (not shown), to prevent light from spilling from the fringe region of this light guide plate 3, promoting display effect.In an embodiment of the present invention, described reflector plate 4 is white reflection sheet or silver-colored reflector plate, and its surface is coated with reflecting surface, and the reflecting surface of coating selects the reflecting material of reflectivity more than 50%, to improve reflecting effect.
Further, described light guide plate 3 adopts optical grade acrylic (Polymethylmethacrylate, PMMA)/Merlon (Polycarbonate, PC) to be base material, and it is for changing line source into area source.
Preferably, described light guide plate 3 should seamlessly contact with between described reflector plate 4, described optical diaphragm group 20, so not only can reduce the integral thickness of described backlight module 100, can also improve display quality.
In the present embodiment, light source can be cold cathode fluorescent tube (CCFL, old Cathode Fluorescent Lamp), thermic cathode fluorimetric pipe, light emitting diode (LED, Light Emitting Diode) and EL sheet (EL, Electroluminescence) etc.
Preferably, this light source can be LED light source, and this LED light source adopts dc source, has longer service life.Specific to the light bang path of backlight module, when injecting light guide plate 3 after the light injection reflection cavity that light source 6 sends, some light arrives described diffusion sheet 23, described lower brightening piece 22 and upper brightening piece 21 successively, and be finally incident to display floater, the incident light of another part reflects via reflector plate 4, reflection ray out arrives described diffusion sheet 23, described lower brightening piece 22 and upper brightening piece 21 successively, and is finally incident to display floater.
Be understandable that, described liquid crystal display and described backlight module 100 can be applied to any product or parts with Presentation Function such as Electronic Paper, LCD TV, mobile phone, DPF, panel computer.
Above-described embodiment, does not form the restriction to this technical scheme protection domain.The amendment done within any spirit at above-mentioned embodiment and principle, equivalently to replace and improvement etc., within the protection domain that all should be included in this technical scheme.

Claims (10)

1. a backlight module, comprise the optical diaphragm group set gradually from top to bottom, light guide plate, reflector plate, it is characterized in that, also comprise glue frame, FPC, be located at the light source on described FPC, described glue frame is placed on described reflector plate, described optical diaphragm group and described light guide plate are contained in described glue frame, the inner surface of described glue frame is provided with arc-shaped recess, described arc-shaped recess surface is provided with the first reflecting surface, described light source is between the incidence surface and described glue frame of described light guide plate, the exiting surface of described light source is towards described first reflecting surface, described FPC is provided with the second reflecting surface in the face of the surface of described light source, the non-exiting surface of described light source is provided with the 3rd reflecting surface, described first reflecting surface, described second reflecting surface and described 3rd reflecting surface form reflection cavity jointly.
2. backlight module as claimed in claim 1, it is characterized in that, described light source is fixed in the focus of described arc-shaped recess by rigid wire, and described rigid wire is electrically connected described FPC and described light source.
3. backlight module as claimed in claim 2, it is characterized in that, described light source is rectangle, described surface of light source is first surface to described light guide plate, described light source second surface and the 3rd surface are oppositely arranged and are parallel to the plane at described reflecting plate place, described second surface and described 3rd surface are connected between described first surface and described exiting surface, described light source the 4th surface and the 5th surface are oppositely arranged and perpendicular to the plane at described reflecting plate place, described 4th surface and described 5th surface are connected between described first surface and described exiting surface, distance < 3mm between described 4th surface and described 5th surface, the distance < 1mm of described first surface and described exiting surface, distance < 0.4mm between described second surface and described 3rd surface.
4. backlight module as claimed in claim 2, is characterized in that, described FPC part is attached at the side away from described reflector plate of described light guide plate, and another part of described FPC is attached at the side away from described reflector plate of described glue frame.
5. backlight module as claimed in claim 2, it is characterized in that, also comprise shading rubber belt, a described shading rubber belt part is attached at the side away from described reflector plate of described light guide plate, another part of described shading rubber belt is attached at the side away from described reflector plate of described glue frame, described shading rubber belt is provided with reflecting surface towards the Lights section between described glue frame and described light guide plate, described FPC part is attached at the side near described reflector plate of described glue frame, and another part of described FPC is attached on described reflector plate.
6. backlight module as claimed in claim 1, is characterized in that, described first reflecting surface, described second reflecting surface and described 3rd reflecting surface form reflecting surface by the mode applying reflecting material.
7. backlight module as claimed in claim 1, it is characterized in that, described optical diaphragm group comprises brightening piece on, once brightening piece and a diffusion sheet, described lower brightening piece is on described between brightening piece and described diffusion sheet, described diffusion sheet fits in described light guide plate, fits in described upper brightening piece and described viewing area.
8. backlight module as claimed in claim 1, it is characterized in that, the outer surface not arranging light source of described light guide plate has reflecting surface, and the light inciding described mirror surface is reflected back in described light guide plate by described reflecting surface.
9. backlight module as claimed in claim 8, it is characterized in that, described light guide plate and described reflector plate are seamless contact.
10. a liquid crystal display, is characterized in that, comprises the backlight module described in claim 1 to 9 any one.
CN201510413484.7A 2015-07-14 2015-07-14 Backlight module and liquid crystal display Active CN104964213B (en)

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Cited By (10)

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CN105301840A (en) * 2015-11-18 2016-02-03 武汉华星光电技术有限公司 Backlight module and liquid crystal display device
CN108227071A (en) * 2018-01-31 2018-06-29 广东欧珀移动通信有限公司 A kind of backlight module and electronic device
CN109348152A (en) * 2018-11-16 2019-02-15 青岛恒泰机械配件有限公司 A kind of 3D curved surface LCD TV
CN109828411A (en) * 2019-02-22 2019-05-31 信利光电股份有限公司 A kind of backlight
CN110056824A (en) * 2019-03-20 2019-07-26 江苏铁锚玻璃股份有限公司 A kind of decorative lamp of optical texture
CN110242894A (en) * 2019-04-29 2019-09-17 江苏铁锚玻璃股份有限公司 A kind of decorative lamp of optical texture
CN114397783A (en) * 2022-03-14 2022-04-26 深圳市南极光电子科技股份有限公司 Ultrathin Mini-LED backlight source with uniform light emission
CN115061232A (en) * 2022-07-07 2022-09-16 友达光电(昆山)有限公司 Optical assembly and display device using same
WO2023108510A1 (en) * 2021-12-13 2023-06-22 武汉华星光电技术有限公司 Backlight module and display panel
US11982829B2 (en) 2021-12-13 2024-05-14 Wuhan China Star Optoelectronics Technology Co., Ltd. Backlight module and display panel

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CN105301840A (en) * 2015-11-18 2016-02-03 武汉华星光电技术有限公司 Backlight module and liquid crystal display device
CN108227071A (en) * 2018-01-31 2018-06-29 广东欧珀移动通信有限公司 A kind of backlight module and electronic device
CN109348152A (en) * 2018-11-16 2019-02-15 青岛恒泰机械配件有限公司 A kind of 3D curved surface LCD TV
CN109828411A (en) * 2019-02-22 2019-05-31 信利光电股份有限公司 A kind of backlight
CN110056824A (en) * 2019-03-20 2019-07-26 江苏铁锚玻璃股份有限公司 A kind of decorative lamp of optical texture
CN110242894A (en) * 2019-04-29 2019-09-17 江苏铁锚玻璃股份有限公司 A kind of decorative lamp of optical texture
WO2023108510A1 (en) * 2021-12-13 2023-06-22 武汉华星光电技术有限公司 Backlight module and display panel
US11982829B2 (en) 2021-12-13 2024-05-14 Wuhan China Star Optoelectronics Technology Co., Ltd. Backlight module and display panel
CN114397783A (en) * 2022-03-14 2022-04-26 深圳市南极光电子科技股份有限公司 Ultrathin Mini-LED backlight source with uniform light emission
CN115061232A (en) * 2022-07-07 2022-09-16 友达光电(昆山)有限公司 Optical assembly and display device using same
CN115061232B (en) * 2022-07-07 2024-03-15 友达光电(昆山)有限公司 Optical assembly and display device using same

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