WO2018133361A1 - 背光模组及液晶显示装置 - Google Patents

背光模组及液晶显示装置 Download PDF

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Publication number
WO2018133361A1
WO2018133361A1 PCT/CN2017/095115 CN2017095115W WO2018133361A1 WO 2018133361 A1 WO2018133361 A1 WO 2018133361A1 CN 2017095115 W CN2017095115 W CN 2017095115W WO 2018133361 A1 WO2018133361 A1 WO 2018133361A1
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Prior art keywords
backlight module
light source
film
transflective
transflective film
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PCT/CN2017/095115
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English (en)
French (fr)
Inventor
杨周
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京东方科技集团股份有限公司
高创(苏州)电子有限公司
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Priority to US15/745,024 priority Critical patent/US10591773B2/en
Publication of WO2018133361A1 publication Critical patent/WO2018133361A1/zh

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    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/13332—Front frames
    • 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
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a backlight module and a liquid crystal display device.
  • a conventional liquid crystal display device generally displays a screen in a combination of a backlight module and a liquid crystal display panel.
  • the backlight module is an important component of the liquid crystal display device, and supplies a sufficient light source with uniform brightness and uniform distribution for the liquid crystal display panel, so that the image can be normally displayed.
  • the backlight module can be divided into a side-in and a direct-down type according to the position of the light source.
  • the side-entry backlight module has the advantages of thin thickness and low power consumption, but as the size of the liquid crystal display panel is gradually increased, the side-in backlight The module seriously hinders its development due to factors such as poor heat dissipation and poor brightness uniformity.
  • the advantages of the direct-lit backlight module in large-size liquid crystal display devices are gradually becoming more prominent.
  • the thickness of the direct-lit backlight module has become an important reason for restricting its development, because the direct-lit backlight module The thickness and the optical quality are mutually restricted.
  • the thickness When the thickness is large, the light mixing distance of the backlight module is large, and the optical quality is good; when the thickness is reduced, the light mixing distance becomes small, so that the light shadow is easy to appear, and the optical quality is changed. Poor, but also produces glare that is more harmful to the human eye.
  • the usual method is to increase the number of light sources, change the light type of the lens of the light source, increase the thickness of the diffusion plate and the haze, increase the number of optical films, etc., which is inevitably This causes an increase in cost and is also disadvantageous for the ultra-thinning of the liquid crystal display device.
  • Embodiments of the present disclosure provide a backlight module and a liquid crystal display device for improving backlight module light Learning quality without increasing its thickness and reducing costs.
  • the embodiment of the present disclosure provides a backlight module, including: a back plate, a reflection sheet and a plurality of light sources disposed on one side of the back plate, and a side of the reflection sheet facing away from the back plate and An optical film having a set distance between the reflective sheets, further comprising: at least one semi-transparent film located on a side of the optical film facing the light source;
  • the number of the transflective films is the same as the number of the light sources, and is aligned with the light source.
  • the shape of the transflective film is a center symmetrical shape, and the shape of the transflective film is centered in the center.
  • the orthographic projection of the backplane coincides with the center of illumination of the light source.
  • the shape of the transflective film is a circular shape or a regular polygon.
  • an area of the transflective film is larger than an area of the light source.
  • a maximum width of the transflective film and a maximum width of the light source satisfy a relationship: 2H ⁇ L ⁇ 6H;
  • H is the maximum width of the light source and L is the maximum width of the transflective film.
  • the transflective film is supported by a support member; or the transflective film is directly attached to the device. On the optical film.
  • the optical film includes a prism sheet.
  • the backlight module provided by the embodiment of the present disclosure further includes: a middle frame for fixing the optical film on the backboard, and The front frame of the backlight module and the display screen located on the light emitting surface of the backlight module.
  • an embodiment of the present disclosure provides a liquid crystal display device, including any of the above backlight modules.
  • FIG. 1 is a schematic structural view of a conventional backlight module
  • FIG. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of an optical path of a backlight module according to an embodiment of the present disclosure
  • FIG. 4 is another schematic structural diagram of a backlight module according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a bracket according to an embodiment of the present disclosure.
  • FIG. 6 is still another schematic structural diagram of a backlight module according to an embodiment of the present disclosure.
  • the direct type backlight module of the prior art includes: a back plate 11, a reflection sheet 12, a light source 13, a diffusion sheet 14, and an optical Diaphragm 15.
  • the light emitted from the light source 13 is directly incident or reflected by the reflection sheet 12 and is incident on the diffusion sheet 14.
  • the diffusion sheet 14 diffuses the incident light to broaden the viewing angle.
  • the light passes through the optical film 15 and is incident on the liquid crystal display.
  • the light mixing distance is usually the thickness of the cavity of the backlight module, that is, the distance between the diffusion sheet and the light source. The larger the light mixing distance, the more uniform the light emitted by the light source and the better the optical quality. .
  • the backlight module of the prior art if the light mixing distance is increased, the thickness of the cavity needs to be increased, which inevitably increases the overall thickness of the backlight module, and the display device cannot be thinned.
  • the embodiments of the present disclosure provide a backlight module, which can improve the optical quality of the backlight module without increasing the thickness thereof and reducing the cost.
  • the backlight module provided by the embodiment of the present disclosure includes: a back plate 21 , a reflective sheet 22 disposed on one side of the back plate and a plurality of light sources 23 , and a reflective sheet 22 disposed away from the back sheet 21 .
  • the optical film 24 having a set distance between the side and the reflection sheet 22 further includes at least one transflective film 25 on the side of the optical film 24 facing the light source 23.
  • the intensity of the central portion of the outgoing beam of the light source 23 is relatively large, but the uniformity of the partial beam is relatively poor. Therefore, the above-mentioned transflective film provided by the embodiment of the present disclosure is designed for the partial beam. . As shown in Figure 3, for a less uniform beam, the semi-transparent film will be part of The light is directly emitted to the optical film 24, and the other portion of the light is returned to the reflection sheet 22, and is then reflected by the reflection sheet to the optical film 24.
  • the light mixing distance of the partial light beam is increased without changing the original thickness of the backlight module, and the uniformity of the central beam of the light source is improved; in addition, since the light is subjected to secondary reflection The light exit angle is enlarged, so that it is not necessary to provide a diffusion sheet to widen the viewing angle, thereby saving cost and further reducing the thickness of the backlight module.
  • a plurality of transflective films 25 are included, and the transflective film 25 is aligned with the light source 23 one by one. That is, a semi-transparent film 25 is disposed at a position on the side of the optical film 24 facing the light source 23 aligned with the light emitted from each of the light sources 23, so that the uniformity of the light emitted from each of the light sources 23 is improved.
  • the shape of the transflective film 25 is a center symmetrical shape, and the shape of the transflective film 25 is centered on the front projection 21 and the light source.
  • the illuminating centers of 23 coincide.
  • the transflective film 25 needs to be disposed at the corresponding light source 23. Directly in front of the light direction.
  • the shape of the transflective film 25 may be a circular shape or a regular polygon.
  • the shape of the transflective film 25 may be a square, a regular hexagon or the like.
  • the light source 23 may be a hemispherical point light source, and the exiting light center is symmetric. Therefore, the transflective film is also centrally symmetrical to accommodate the light source. shape.
  • the corresponding transflective film should be adaptively changed, as long as the transflective film 25 can act on the light of the light source 23 with poor uniformity, this embodiment
  • the shape of the transflective film is not limited in this case.
  • a support member 26 for supporting the transflective film 25 is further included.
  • the support member 26 can support not only the transflective film 25 but also other optical film layers (such as the optical film 24) located on the cavity.
  • the supporting member 26 includes: a bracket 261 for supporting the transflective film 25, a central portion of the connecting bracket 261 is a hollow base 262, and a positioning of the fixed base on the substrate Hole 263.
  • the light source 23 can be disposed at the center of the hollow region of the base 262, and the semi-transparent film supported by the bracket 261 acts on a part of the light of the light source 23.
  • the cavity thickness of the backlight module is generally considered to be the distance between the light source 23 and the transflective film 25. . The farther away from the light source, the more severe the divergence of the beam, so the area of the transflective film 25 needs to be properly set according to the above distance.
  • the area of the transflective film 25 is larger than the area of the light source 23.
  • the transflective film 25 may be circular, and the shape of the light source 23 on the back plate is also circular, and the diameter L of the transflective film 25 is larger than the diameter H of the light source 23.
  • the intensity of the light beam with a divergence angle of 60 degrees or less is poor, and the uniformity is poor.
  • the maximum width (ie, diameter) of the light source is usually 7-8 mm, and the light source 23 and the transflective half are opposite.
  • the distance between the films 25 can be generally 18-32 mm, and therefore, the relationship between the width of the transflective film acting on the light beam having a divergence angle of 60 degrees and the width of the light source satisfies the relationship 2H ⁇ L ⁇ 6H; wherein H represents The maximum width of the light source (such as the diameter of a circular light source), L represents the maximum width of the transflective film (such as the diameter of a circular transflective film).
  • the transflective film 25 can also be attached directly to the optical film 24, thereby reducing components and further reducing cost.
  • the optical film 24 may include a prism sheet.
  • the optical film 24 may further include other functional films, which are not limited herein.
  • the method further includes: a middle frame 27 for fixing the optical film 24 on the back plate 21, and a backlight module and The front frame 28 is fixed on the display screen of the backlight module.
  • an embodiment of the present disclosure further provides a liquid crystal display device, including any of the above backlight modules and a liquid crystal display panel located on a light emitting surface of the backlight module.
  • the liquid crystal display can be a liquid crystal panel, a liquid crystal display, a liquid crystal television, or the like.
  • the backlight module and the liquid crystal display device include: a backboard, which is sequentially disposed a reflective sheet disposed on a side of the backing plate and a plurality of light sources, and an optical film disposed on a side of the reflective sheet facing away from the backing plate and having a set distance from the reflective sheet, further comprising: at least one of the optical film facing the light source Semi-transparent film on one side.
  • the transflective film can reflect part of the light emitted by the light source, and then the second reflection of the backlight module reflects the angle of the part of the light to the liquid crystal display, and does not need to increase the overall backlight module. Increase the light mixing distance under the premise of thickness and improve the optical quality of the backlight module.

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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)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

一种背光模组及显示装置，背光模组包括：背板（21），依次设置在背板（21）一侧的反射片（22）和多个光源（23），以及设置在反射片（22）背离背板（21）一侧且与反射片（22）之间具有设定距离的光学膜片（24），还包括：至少一个位于光学膜片（24）面向光源（23）一侧的半透半反膜（25）。从而实现背光模组的轻薄化。

Description

背光模组及液晶显示装置
相关申请的交叉引用
本申请要求于2017年8月17日递交中国专利局的、申请号为201720058887.9的中国专利申请的权益，该申请的全部公开内容以引用方式并入本文。
技术领域
本公开涉及显示技术领域，特别涉及一种背光模组及液晶显示装置。
背景技术
现有的液晶显示装置通常采用背光模组与液晶显示面板组合的方式显示画面。背光模组是液晶显示装置的重要组件，其为液晶显示面板供应充足的亮度与分布均匀的光源，使其能正常显示影像。
背光模组根据光源位置不同，可分为侧入式与直下式，侧入式背光模组具有厚度薄、功耗低等优点，但随着液晶显示面板的尺寸逐渐增大，侧入式背光模组由于散热性差、亮度均匀性差等因素严重阻碍其发展。而直下式背光模组应用于大尺寸液晶显示装置中的优势逐渐凸显，但现有技术条件下，直下式背光模组的厚度成为制约其发展的重要原因，这是因为直下式背光模组的厚度与光学品质两者相互制约，当厚度较大时，背光模组的混光距较大，光学品质较好；当厚度减小时，其混光距变小，从而易出现灯影，光学品质变差，同时还会产生对于人眼伤害较大的眩光。为了兼顾直下式背光模组的厚度和光学品质，通常采用的办法是增加光源数量、改变光源的透镜的光型、增加扩散板的厚度以及雾度、增加光学膜片数量等，这不可避免地造成成本增加，同时也不利于液晶显示装置超薄化。
发明内容
本公开实施例提供了一种背光模组及液晶显示装置，用以提高背光模组光 学品质的同时不增加其厚度，降低成本。
本公开实施例提供了一种背光模组，包括：背板，依次设置在所述背板一侧的反射片和多个光源，以及设置在所述反射片背离所述背板一侧且与所述反射片之间具有设定距离的光学膜片，还包括：至少一个位于所述光学膜片面向所述光源一侧的半透半反膜；
在一种可选的实施方式中，在本公开实施例提供的上述背光模组中，所述半透半反膜的数量和光源的数量相同，且与所述光源一一对齐。
在一种可选的实施方式中，在本公开实施例提供的上述背光模组中，所述半透半反膜的形状为中心对称形状，且所述半透半反膜的形状中心在所述背板的正投影与所述光源的发光中心重合。
在一种可选的实施方式中，在本公开实施例提供的上述背光模组中，所述半透半反膜的形状为圆形或正多边形。
在一种可选的实施方式中，在本公开实施例提供的上述背光模组中，所述半透半反膜的面积大于所述光源的面积。
在一种可选的实施方式中，在本公开实施例提供的上述背光模组中，所述半透半反膜的最大宽度与所述光源最大宽度满足关系式：2H<L<6H；
其中，H为所述光源的最大宽度，L为所述半透半反膜的最大宽度。
在一种可选的实施方式中，在本公开实施例提供的上述背光模组中，所述半透半反膜通过支撑部件进行支撑；或者，所述半透半反膜直接贴附在所述光学膜片上。
在一种可选的实施方式中，在本公开实施例提供的上述背光模组中，所述光学膜片包括棱镜片。
在一种可选的实施方式中，在本公开实施例提供的上述背光模组中，还包括：用于固定所述光学膜片于所述背板之上的中框，以及用于将所述背光模组与位于所述背光模组出光面的显示屏固定的前框。
第二方面，本公开实施例提供一种液晶显示装置，包括上述任一背光模组。
附图说明
图1为现有的背光模组的结构示意图；
图2为本公开实施例提供的背光模组的一个结构示意图；
图3为本公开实施例提供的背光模组的光路示意图；
图4为本公开实施例提供的背光模组的另一个结构示意图；
图5为本公开实施例提供的支架的结构示意图；
图6为本公开实施例提供的背光模组的又一个结构示意图。
具体实施方式
图1为现有的直下式背光模组的结构示意图，如图1所示，现有技术中的直下式背光模组，包括：背板11、反射片12、光源13、扩散片14和光学膜片15。光源13出射的光直接入射或经过反射片12反射而入射至扩散片14，扩散片14将入射的光线进行扩散，拓宽视角；最后光线透过光学膜片15后入射至液晶显示屏。在直下式背光模组中，混光距离通常为背光模组腔体的厚度，即扩散片和光源之间的距离，混光距离越大，则光源所出射的光线更均匀，光学品质更好。现有技术中的背光模组如若增大混光距离则需要将腔体的厚度增大，这不可避免地会造成背光模组的整体厚度增大，不能够实现显示装置超薄化。
有鉴于此，本公开实施例提供一种背光模组，可以提高背光模组光学品质的同时不增加其厚度，降低成本。如图2所示，本公开实施例提供的背光模组，包括：背板21，依次设置在背板一侧的反射片22和多个光源23，以及设置在反射片22背离背板21一侧且与反射片22之间具有设定距离的光学膜片24，还包括：至少一个位于光学膜片24面向光源23一侧的半透半反膜25。
在具体实施中，光源23的出射光束中心部分的强度较大，但这部分光束的均匀度相对较差，因此，本公开实施例提供的上述半透半反膜就是针对这部分光束而设计的。如图3所示，针对均匀性较差的光束，半透半返膜将一部分 光线直接出射至光学膜片24，而将另一部分光线再返回反射片22，经过反射片的二次反射再向光学膜片24出射。由此，经过反射片22的二次反射，在不改变背光模组原始厚度的前提下增大了该部分光束的混光距离，光源中心光束的均匀性提高；此外，由于光线经过二次反射扩大了光线出射角，因此不需要再设置扩散片来拓宽视角，从而节省成本，进一步实现背光模组的轻薄化。
可选地，在本公开实施例提供的上述背光模组中，如图2所示，包括多个半透半反膜25，且半透半反膜25与光源23一一对齐。即在光学膜片24面向光源23的一侧的与每个光源23出射光所对齐的位置均设置一个半透半反膜25，以使各光源23出射光线的均匀性都得到改善。
在具体实施时，在本公开实施例提供的上述背光模组中，半透半反膜25的形状为中心对称形状，且半透半反膜25的形状中心在背板21的正投影与光源23的发光中心重合。如上所述，由于光源23所出射的中心部分光束的均匀性较差，因此，为了对这部分光线进行二次反射以提高其混光距离，需要将半透半反膜25设置在对应光源23的出光方向的正前方。
进一步地，在本公开实施例提供的上述背光模组中，半透半反膜25的形状可为圆形或正多边形。例如，半透半反膜25的形状可为正方形，正六边形等。需要说明的是，在本公开实施例提供的上述背光模组中，光源23可为半球形的点光源，其出射光线中心对称，因此，半透半反膜为适应此种光源也呈中心对称形状。而在改变光源23出光形式后，其对应的半透半反膜应作出适应性的改变，只要半透半反膜25可作用于光源23的均匀性较差那部分光线即可，本实施例不对此种情况下半透半反膜的形状进行限定。
在具体实施时，在本公开实施例提供的上述背光模组中，如图4所示，还包括用于支撑半透半反膜25的支撑部件26。支撑部件26不仅可以支撑半透半反膜25，还可对位于腔体上的其它光学膜层(如光学膜片24)起到支撑作用。
进一步地，如图5所示，支撑部件26包括：用于支撑半透半反膜25的支架261，连接支架261的中部为镂空的底座262，以及固定底座于基板的定位 孔263。其中，光源23可设置于底座262的镂空区域的中心，支架261所支撑的半透半反膜作用于光源23的一部分光线。
在实际应用中，由于半透半反膜25与对应的光源23的距离为一确定值，通常情况下可认为背光模组的腔体厚度为光源23与半透半反膜25之间的距离。距离光源越远，光束的发散越严重，因此半透半反膜25的面积需要根据上述距离进行合理设置。
具体地，半透半反膜25的面积大于光源23的面积。进一步地，如图5所示，半透半反膜25可为圆形，光源23在背板上的形状也为圆形，则半透半反膜25的直径L大于光源23的直径H。通常情况下光源发散角为60度以内的光束的强度较大，均匀性差；以半球形的点光源为例，光源的最大宽度(即直径)通常为7-8mm，光源23与半透半反膜25之间的距离通常可为18-32mm，因此，作用于发散角为60度以内的光束的半透半反膜的宽度与光源宽度之间满足关系2H<L<6H；其中，H表示光源的最大宽度(如圆形光源的直径)，L表示半透半反膜的最大宽度(如圆形半透半反膜的直径)。
在另一种可实施的方式中，半透半反膜25也可以直接贴附在光学膜片24上，由此减少部件，进一步降低成本。
在具体实施时，在本公开实施例提供的上述背光模组中，光学膜片24可包括棱镜片。此外，为使背光模组具有其它光学性能，光学膜片24还可包括其它功能性膜片，在此不做限定。
此外，在本公开实施例提供的上述背光模组中，如图6所示，还包括：用于固定光学膜片24于背板21之上的中框27，以及用于将背光模组与位于背光模组出光面的显示屏固定的前框28。
基于同一发明构思，本公开实施例还提供一种液晶显示装置，包括上述任一背光模组以及位于背光模组出光面的液晶显示屏。该液晶显示屏可为液晶面板、液晶显示器、液晶电视等。
本公开实施例提供的上述背光模组及液晶显示装置，包括：背板，依次设 置在背板一侧的反射片和多个光源，以及设置在反射片背离背板一侧且与反射片之间具有设定距离的光学膜片，还包括：至少一个位于光学膜片面向光源一侧的半透半反膜。由于半透半反膜可将光源出射的部分光线进行反射，再由背光模组的反射片二次反射，扩大该部分光线出射到液晶显示屏的角度，同时在不需要增大背光模组整体厚度的前提下增大混光距离，提高背光模组的光学品质。
尽管已描述了本公开的可选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变型和代替。所以，所附权利要求意欲解释为包括可选实施例以及落入本公开范围的所有变型和代替。
显然，本领域的技术人员可以对本公开进行各种变型和代替而不脱离本公开的精神和范围。这样，倘若本公开的这些变型和代替属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (10)

  1. 一种背光模组，包括：背板，依次设置在所述背板一侧的反射片和多个光源，以及设置在所述反射片背离所述背板一侧且与所述反射片之间具有设定距离的光学膜片，其特征在于，还包括：至少一个位于所述光学膜片面向所述光源一侧的半透半反膜。
  2. 如权利要求1所述的背光模组，其特征在于，所述半透半反膜的数量和光源的数量相同，且布置成与所述光源一一对齐。
  3. 如权利要求2所述的背光模组，其特征在于，所述半透半反膜的形状为中心对称形状，且所述半透半反膜的形状中心在所述背板的正投影与所述光源的发光中心重合。
  4. 如权利要求3所述的背光模组，其特征在于，所述半透半反膜的形状为圆形或正多边形。
  5. 如权利要求3所述的背光模组，其特征在于，所述半透半反膜的面积大于所述光源的面积。
  6. 如权利要求2所述的背光模块，其特征在于，所述半透半反膜的最大宽度与所述光源最大宽度满足关系式：2H<L<6H；
    其中，H为所述光源的最大宽度，L为所述半透半反膜的最大宽度。
  7. 如权利要求1所述的背光模组，其特征在于，所述半透半反膜通过支撑部件进行支撑；或者，所述半透半反膜直接贴附在所述光学膜片上。
  8. 如权利要求1-7任一项所述的背光模组，其特征在于，所述光学膜片包括棱镜片。
  9. 如权利要求1-7任一项所述的背光模组，其特征在于，还包括：用于固定所述光学膜片于所述背板之上的中框，以及用于将所述背光模组与位于所述背光模组出光面一侧的显示屏固定的前框。
  10. 一种液晶显示装置，其特征在于，包括如权利要求1-9任一项所述的 背光模组。
PCT/CN2017/095115 2017-01-17 2017-07-31 背光模组及液晶显示装置 WO2018133361A1 (zh)

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