WO2020237956A1 - Module de rétroéclairage de type direct et dispositif d'affichage à cristaux liquides - Google Patents

Module de rétroéclairage de type direct et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2020237956A1
WO2020237956A1 PCT/CN2019/109039 CN2019109039W WO2020237956A1 WO 2020237956 A1 WO2020237956 A1 WO 2020237956A1 CN 2019109039 W CN2019109039 W CN 2019109039W WO 2020237956 A1 WO2020237956 A1 WO 2020237956A1
Authority
WO
WIPO (PCT)
Prior art keywords
backlight module
direct type
type backlight
birefringent film
light source
Prior art date
Application number
PCT/CN2019/109039
Other languages
English (en)
Chinese (zh)
Inventor
陈锦雄
Original Assignee
惠州市华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 惠州市华星光电技术有限公司 filed Critical 惠州市华星光电技术有限公司
Publication of WO2020237956A1 publication Critical patent/WO2020237956A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F1/00—Devices 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
    • G02F1/01—Devices 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 
    • G02F1/13—Devices 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F1/00—Devices 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
    • G02F1/01—Devices 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 
    • G02F1/13—Devices 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation

Definitions

  • the present invention relates to the technical field of liquid crystal display, in particular to a direct type backlight module and a liquid crystal display device.
  • the existing direct type backlight module 200 includes a diffuser plate carrier 21, a circuit board 22, a diffuser plate 23 and an optical film 24.
  • the diffuser plate carrier 21 is used to carry the diffuser plate 23 and the optical film 24,
  • the circuit board 22 is arranged at the inner bottom of the diffuser plate carrier 21, and the circuit board 22 includes a plurality of light sources for providing light sources.
  • the current carrying length L of the edge of the diffusion plate carrying platform 21 is reduced, but at the same time it will also cause other problems, such as easy formation of bright or dark frames.
  • the diffuser 23 will shrink or expand in a cold and hot environment, resulting in a lower limit of the edge bearing length L, that is, L must be greater than a certain value. Especially in the design of the ultra-narrow frame backlight module, it is difficult to solve the dark shadows in the four corners of the display area of the backlight module.
  • the purpose of the present invention is to provide a direct-type backlight module and a liquid crystal display device to solve the four corners of the direct-type backlight module of the liquid crystal display device in the prior art, achieve uniform brightness of the backlight module, improve the display effect, and further Improve the structure of the diffuser plate bearing platform to achieve a narrow frame design.
  • an embodiment of the present invention provides a direct type backlight module, which includes a diffuser plate carrier, a circuit board, a diffuser plate, an optical film, and a birefringent film.
  • a light source is provided on the circuit board; the diffusion plate is provided on the diffusion plate carrier; the optical film is provided on the diffusion plate; the birefringent film is provided on the Above the circuit board; wherein the light emitted by the light source is refracted by the birefringent film and propagates away from the light source.
  • the birefringent film is arranged at the edge of the surface of the diffusion plate facing the light source.
  • the birefringent film is arranged at the edge of the surface of the diffusion plate facing the optical film.
  • the birefringent film is arranged at the edge of the surface of the optical film on the side away from the light source.
  • the birefringent film is in one or more of rectangular shape, round shape and triangular shape.
  • the birefringent diaphragm is in a right-angled triangle shape and is correspondingly arranged at the corners of the diffuser plate.
  • the right-angle side length of the birefringent membrane is less than half of the side length of the corresponding diffuser plate.
  • the diffuser plate bearing platform is in the shape of a cuboid, surrounded by four side walls end to end, and the edge thickness of the side wall is smaller than the middle thickness of the side wall.
  • the refractive index of the diffusion plate is in the range of 1.48-1.60.
  • a liquid crystal display device in yet another embodiment, includes a liquid crystal display panel and the above-mentioned direct-type backlight module.
  • the liquid crystal display panel is arranged on the light-emitting device of the direct-type backlight module. Face one side.
  • the invention relates to a direct type backlight module and a liquid crystal display device.
  • a direct type backlight module By adding a birefringent film, the defects of the dark shadow at the corners can be obviously improved, the display brightness of the light at the corners can be improved, and the entire display area can be displayed more uniformly and the display effect is better. , And further improve the structure of the diffuser plate bearing platform to achieve a narrow frame design.
  • FIG. 1 is a schematic diagram of a partial structure of an existing direct type backlight module
  • FIG. 2 is a schematic structural diagram of a direct type backlight module in the first embodiment of the present invention
  • FIG. 3 is a schematic diagram of the structure of the light source distributed on the circuit board in the first embodiment of the present invention.
  • FIG. 4 is a schematic diagram of the structure of the birefringent film layer in the first embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the birefringence of the birefringent film layer in the first embodiment of the present invention.
  • Figure 6 is a top view of the diffuser plate carrying platform in the first embodiment of the present invention.
  • Figure 7 is a cross-sectional view of Figure 6 at B-B;
  • FIG. 8 is a schematic structural diagram of a direct type backlight module in the second embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a direct type backlight module in the third embodiment of the present invention.
  • the component can be directly placed on the other component; there may also be an intermediate component on which the component is placed , And the intermediate component is placed on another component.
  • a component is described as “installed to” or “connected to” another component, both can be understood as directly “installed” or “connected”, or a component is “installed to” or “connected to” through an intermediate component Another component.
  • a direct type backlight module 100 which includes a diffuser plate carrier 1, a circuit board 2, a diffuser plate 3, an optical film 4 and a birefringent film 5.
  • the circuit board 2 is provided with a plurality of light sources 6; the diffusion plate 3 is provided on the diffusion plate carrier 1; the optical film 4 is provided on the diffusion plate 3;
  • the birefringent film 5 is arranged above the circuit board 2; wherein the light emitted by the light source 6 is refracted by the birefringent film 5 and then propagates in a direction away from the light source 6.
  • the birefringent film 5 is provided at the edge of the surface of the diffuser 3 facing the light source 6.
  • the birefringent film 5 refracts the light emitted by the light source 6 and propagates the refracted light to the edge of the diffusion plate carrying table 1.
  • the light sources 6 are distributed on the circuit board 2 in an array.
  • the illustrated light source 6 is preferably an organic light emitting diode (LED).
  • LED organic light emitting diode
  • several more light sources 6 can be provided at the four corners of the circuit board 2 to provide sufficient light to prevent the distance value of the light source 6 from being too large, causing the normally luminous light to not sufficiently reach the display area.
  • the corner position causes the undesirable phenomenon of shadows and dark frames in the four corners.
  • the birefringent film 5 may be one or more of rectangular, back-shaped, and triangular. As long as it is satisfied that the light emitted by the light source 6 is refracted by the birefringent film 5 and propagates in a direction away from the light source 6, it belongs to the protection scope of the present invention.
  • the birefringent film 5 When the birefringent film 5 is rectangular, the birefringent film 5 can be adapted to the shape and size of the diffuser 3, or there can be multiple, which are arranged on the sides or sides of the diffuser 3 At the corners; in order to further save the material cost and integrate the arrangement, the birefringent diaphragm 5 is in the shape of a back shape, that is, a hollow structure; in order to further save the material cost, the birefringent diaphragm 5 may be triangular and arranged in the The corners of the diffuser 3.
  • the birefringent film 5 is a right-angled triangle and is arranged at the corners of the diffuser 3, and the birefringent film 5 is attached to the direction of the diffuser 3 The surface on one side of the light source 6. If the length of the long side of the diffuser plate 3 is M, the length of the short side of the diffuser plate 3 is H, and the birefringent membrane 5 is a right-angled triangle whose right-angle sides are A and B, respectively, Set 0 ⁇ A ⁇ M/2, 0 ⁇ B ⁇ H/2. That is, the right-angle side length of the birefringent film 5 is less than half of the side length of the corresponding diffuser 3.
  • the birefringence principle diagram of the birefringent film 5 is shown in Fig. 5, the interfaces a and b are the upper and lower surfaces of the birefringent film. After a beam of light (indicated by the arrow in Fig. 5) is incident on the birefringent film, it occurs
  • the phenomenon of birefringence produces two polarized lights: ordinary light (o light) obeys the law of refraction, while extraordinary light (e light) does not obey the law of refraction.
  • the refraction wave vector of o light is represented by Ko and Ko', and the refraction of e light
  • the wave vector is represented by Ke and Ke'.
  • the refractive index of the diffuser 3 ranges from 1.48 to 1.60.
  • the diffusion plate 3 can be a transparent material or a material with a certain degree of haze: such as glass, quartz, PMMA, MS, PS, etc.; the plate of the diffusion plate 3 can be printed with or without dots.
  • the diffuser plate carrying platform 1 is in the shape of a cuboid, surrounded by four diffuser plate carrying platform side walls 11 end to end, and the edge thickness of the side walls is smaller than the middle thickness of the side walls; The two side walls are connected to form a V-shaped inner corner.
  • the width of the diffuser plate bearing platform 1 near the four corners of the direct type is gradually reduced (top view), set to: 0 ⁇ P ⁇ M/2; 0 ⁇ Q ⁇ H/2, the remaining width of the diffusion plate carrying platform 1 remains unchanged, and the purpose is to carry the diffusion plate 3.
  • FIG 2 it is a cross-sectional view of the diffuser plate carrying platform 1 at AA, that is, it is located in the middle of the diffuser plate carrying platform 1.
  • the diffuser plate carrying platform 1 is at BB
  • This purpose is not only to ensure that the diffuser plate carrying table 1 carrying the diffuser plate 3 has a certain width, but also to gradually shrink at the four corners of the diffuser plate carrying table 1 to form a V-shaped inner corner, so as to While improving the defects of the dark shadows in the four corners, the narrow frame design is further realized.
  • the second embodiment includes all the technical features of the first embodiment.
  • the difference is that the birefringent film 5 in the second embodiment is arranged on the diffuser 3 facing the The edge of the surface of the optical film 4 on one side.
  • the third embodiment includes all the technical features of the first embodiment. The difference is that, in the third embodiment, the birefringent film 5 is located far from the optical film 4 At the edge of the surface on one side of the light source 6.
  • a liquid crystal display device in yet another embodiment, includes a liquid crystal display panel and the direct-type backlight module 100 described above, and the liquid crystal display panel is disposed on the direct-type backlight module 100. Side of the light-emitting surface.
  • the liquid crystal display device in the embodiment of the present disclosure may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.
  • the working principle of the liquid crystal display device provided in this embodiment is consistent with the working principle of the aforementioned direct-lit backlight module 100.
  • the beneficial effect of the present invention is to provide a direct type backlight module and a liquid crystal display device.
  • a birefringent film By adding a birefringent film, the defects of the dark shadow at the corners can be significantly improved, the display brightness of the light at the corners can be improved, and the entire display area can be displayed more uniformly.
  • the display effect is better, and the structure of the diffuser plate bearing platform 1 is further improved to realize a narrow frame design.

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

Abstract

La présente invention concerne un module de rétroéclairage de type direct (100) et un dispositif d'affichage à cristaux liquides. Le module de rétroéclairage de type direct (100) comprend une table de transport de plaque de diffusion (1), une carte de circuit imprimé (2), une plaque de diffusion (3), un diaphragme optique (4) et un diaphragme de biréfringence (5). Une source de lumière (6) est disposée sur la carte de circuit imprimé (2) ; la plaque de diffusion (3) est disposée sur la table de support de plaque de diffusion (1) ; le diaphragme optique (4) est disposé sur la plaque de diffusion (3) ; le diaphragme de biréfringence (5) est disposé au-dessus de la carte de circuit imprimé (2) ; et la lumière émise par la source de lumière (6) est réfractée par le diaphragme de biréfringence (5) et s'étale dans une direction éloignée de la source de lumière (6), ce qui permet d'améliorer l'effet d'ombre au niveau des quatre coins du module de rétroéclairage (100). Le dispositif d'affichage à cristaux liquides comprend le module de rétroéclairage de type direct (100).
PCT/CN2019/109039 2019-05-27 2019-09-29 Module de rétroéclairage de type direct et dispositif d'affichage à cristaux liquides WO2020237956A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910443460.4 2019-05-27
CN201910443460.4A CN110095904A (zh) 2019-05-27 2019-05-27 直下式背光模组和液晶显示装置

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Publication Number Publication Date
WO2020237956A1 true WO2020237956A1 (fr) 2020-12-03

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WO (1) WO2020237956A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110095904A (zh) * 2019-05-27 2019-08-06 惠州市华星光电技术有限公司 直下式背光模组和液晶显示装置
CN111880337A (zh) * 2020-07-31 2020-11-03 深圳创维－Rgb电子有限公司 一种背光组件及液晶显示模组
CN114089562B (zh) * 2021-11-16 2024-04-19 合肥京东方视讯科技有限公司 扩散板、制备方法、背光模组及显示装置
CN117111196A (zh) * 2022-12-30 2023-11-24 深圳Tcl新技术有限公司 双折射膜片、制作方法、复合光学膜片和显示设备

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JP2003315508A (ja) * 2002-04-19 2003-11-06 Nitto Denko Corp 光拡散板、その製造方法、光学素子および画像表示装置
CN1570722A (zh) * 2003-07-25 2005-01-26 友达光电股份有限公司 直下式背光模块
CN1580897A (zh) * 2003-08-03 2005-02-16 鸿富锦精密工业（深圳）有限公司 背光系统
CN2725938Y (zh) * 2004-07-19 2005-09-14 颖台科技股份有限公司 高均匀度发光的直下式背光模组结构
CN1740872A (zh) * 2004-07-19 2006-03-01 三星电子株式会社 用于透射和反射型液晶显示器的相位延迟元件
CN102934015A (zh) * 2010-06-10 2013-02-13 苹果公司 具有减小的莫尔效应的液晶显示器
CN108873482A (zh) * 2018-08-16 2018-11-23 惠州市华星光电技术有限公司 拼接显示装置
CN109164519A (zh) * 2018-09-26 2019-01-08 惠州市华星光电技术有限公司 扩散板、背光结构和显示面板
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CN110095904A (zh) * 2019-05-27 2019-08-06 惠州市华星光电技术有限公司 直下式背光模组和液晶显示装置

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