WO2013033936A1 - 一种led背光模组及液晶显示装置 - Google Patents

一种led背光模组及液晶显示装置 Download PDF

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Publication number
WO2013033936A1
WO2013033936A1 PCT/CN2011/080138 CN2011080138W WO2013033936A1 WO 2013033936 A1 WO2013033936 A1 WO 2013033936A1 CN 2011080138 W CN2011080138 W CN 2011080138W WO 2013033936 A1 WO2013033936 A1 WO 2013033936A1
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Prior art keywords
light
triangles
backlight module
liquid crystal
led
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PCT/CN2011/080138
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English (en)
French (fr)
Inventor
林博瑛
任杰
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深圳市华星光电技术有限公司
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Priority to US13/375,580 priority Critical patent/US20130063927A1/en
Publication of WO2013033936A1 publication Critical patent/WO2013033936A1/zh

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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
    • G02F1/133603—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
    • G02F1/133606—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
    • G02F1/1336—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 invention relates to the field of liquid crystal display, and more particularly to an LED backlight module and a liquid crystal display device.
  • a light emitting diode is a point light source, which is distributed in an array structure according to an array arrangement, and is used as an LED light source in a backlight.
  • a light emitting diode is a point light source, which is distributed in an array structure according to an array arrangement, and is used as an LED light source in a backlight.
  • two-dimensional array distribution whether it is thinning or reducing the use of a small number of LEDs, it is easy to cause two-dimensional bright and dark stripes (mura).
  • most of the light and dark stripes (mura) are added to increase the thickness of the module to increase the light mixing distance. , but this does not meet the needs of the slim and light display.
  • the technical problem to be solved by the present invention is to provide an LED backlight module and a liquid crystal display device which are uniform in brightness and thin.
  • An LED backlight module includes a reflective plate, a plurality of LEDs disposed on the reflective plate, and a diffusing plate opposite to the LED, wherein the diffusing plate is provided with a plurality of uniform light structures.
  • the light incident side of the diffuser plate is provided with a plurality of light entrance surface dots protruding in the direction of the LED to form the light homogenizing structure.
  • the entrance into the smooth dot structure can reduce the height of the light mixing to meet the needs of bright and dark stripes (mura) and thinning.
  • the size of the plurality of entrance surface dots is the same, and the arrangement density of the light entrance surface dots directly above the LED is greater than the arrangement density of the other areas.
  • the LED is brighter at the position directly above the LED. Therefore, increasing the arrangement density of the entrance dots in this area can reflect more light back to the reflector for secondary reflection and mixing. A more uniform brightness can be obtained. The effect is to reduce the number of LEDs and reduce the height of the light mixing.
  • the trapped portion of the inwardly-inclined light-emitting surface microstructure is polygonal in shape. This is a specific structural form of the light-emitting surface microstructure.
  • the light-emitting surface microstructure is an inverted pyramid shape, and the light-emitting surface microstructure is composed of four triangles, and the vertices of the four triangles are intended to be collected in the inner direction of the diffusion plate, and the bottom edges of the four triangles are sequentially The connections form a rectangle.
  • This is a specific structural form of the multi-faceted pyramidal light-emitting surface microstructure.
  • the four triangles are triangles of the same shape; the bottom edges of the four triangles of the light-emitting surface microstructure are sequentially connected to form a square.
  • the square multi-faceted pyramidal exit surface microstructure has a better consistency.
  • the light exiting side is provided with a light exit surface microstructure which is recessed inward; the light entrance surface dot and the light exit surface microstructure together form the light homogenizing structure.
  • the advantages of integrated into the smooth surface and the light-emitting surface microstructure are better in solving the problem of bright and dark stripes (mura), reducing the number of LEDs, improving the effect of diffusion and splitting, and achieving lighter and thinner LED backlight modules.
  • the diffusing plate includes a first diffusing plate and a second diffusing plate stacked on the light emitting surface of the first diffusing plate, wherein the light entering surface is located on the light incident side of the first diffusing plate;
  • the surface microstructure is located on the light exit side of the second diffusion plate.
  • the LED backlight module of the invention has a uniform light structure on the diffusion plate, and the effect of increasing the light mixing distance and the diffusion splitting effect by the reflection and scattering effects of the homogenous light structure, thereby reducing the LED direct type backlight and reducing the number of LEDs. Use, and reduce the phenomenon of light and dark stripes (mura).
  • Figure 1 is a schematic illustration of an embodiment of a single diffuser plate of the present invention
  • Figure 2 is a schematic view showing an embodiment of two diffusion plates of the present invention
  • Figure 3 is a schematic view showing a specific shape of the light-emitting surface microstructure of the present invention.
  • an LED1 backlight module of a liquid crystal display device includes a reflector 5, a plurality of LEDs 1 disposed on the reflector 5, and a diffusion plate 4 opposite to the LED 1 on the diffusion plate 4. There are a plurality of uniform light structures.
  • an outwardly convex, visible light-incident mesh dot 2 may be disposed on the light-incident side of the diffusing plate 4, and the light-injecting mesh dot 2 structure may reduce the height of the light mixing to solve the bright and dark stripes. (mura) and thinning requirements; it is also possible to provide an inwardly recessed visible light-emitting surface microstructure 3 on the light-emitting side of the diffusing plate 4, and the light-emitting surface microstructure 3 is designed to cause the LED1 light source to pass through the light-emitting surface microstructure 3 Diffusion splitting effect to reduce the number of LEDs and reduce the height of the light.
  • the diffusion plate 4 may be divided into a first diffusion plate 41 and a second diffusion plate 42.
  • the light incident side of the first diffuser 41 is opposite to the LED 1; the light incident side of the second diffuser 42 is opposite to the light exiting side of the first diffuser 41;
  • the light incident surface of the first diffusing plate 41 is located on the light emitting side of the second diffusing plate 42.
  • the entrance point 2 of the illuminating surface has the same size, and the size of the illuminating surface dots 2 may be slightly different in the same order of magnitude.
  • the arrangement density of the illuminating surface dots 2 directly above the LED is greater than the arrangement density in other areas.
  • the arrangement density directly above LED1 is greater than other areas. In the direct-lit backlight design, the LED is brighter at the position directly above the LED. Therefore, increasing the arrangement density of the entrance dots in this area can reflect more light back to the reflector for secondary reflection and mixing. A more uniform brightness can be obtained.
  • the light-emitting surface microstructure 3 is a multi-faceted pyramid shape, and the light-emitting surface microstructure 3 may be composed of four triangles, and the vertices of the four triangles are intended to be collected in the inner direction of the diffusion plate 4, and the four The bottom edges of the triangles are sequentially connected to form a rectangle.
  • the four triangles are triangles of the same shape; the light-emitting surface microstructures 3 are connected to each other at four ends of the four triangles to form a square.
  • the square multi-faceted pyramidal exit surface microstructure 3 is more uniform in light expansion.
  • a liquid crystal display device using the above-described LED backlight module using the above-described LED backlight module.
  • the LED1 will be brighter at the position directly above the LED1.
  • the diffusing plate 4 can be placed on the light-side side of the light-injecting surface to solve the problem of light-dark stripes (mura) caused by such light and dark.
  • some light-emitting surface microstructures 3 are formed on the light-emitting side of the diffusion plate 4, so that the LED1 light source passes through the light-emitting surface microstructure 3 to generate diffusion and light splitting, so that the light is relatively uniform to alleviate the phenomenon of light and dark stripes (mura).
  • the light source of the LED1 is passed through the light-emitting surface microstructure 3 diffusion plate, and the light source can be divided into several virtual light sources to effectively achieve the effect of splitting light.
  • the above combination can achieve better resolution of the light and dark stripes (mura) and reduce the number of LEDs and Reduce the height of the backlight cavity.

Abstract

一种LED背光模组及液晶显示装置，所述的LED背光模组包括反射板（5）、设置在反射板（5）上的多个LED（1）、与LED（1）相对置的扩散板（4）；所述扩散板（4）上设有多个均光结构。LED背光模组由于在扩散板（4）上设置了均光结构，通过均光结构的反射和散射效应，增加混光距离和扩散分光的效果，使LED直下式背光轻薄化，减少LED颗数使用，且减轻亮暗条纹的现象。

Description

一种 LED背光模组及液晶显示装置
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种 LED背光模组及液晶显 示装置。
【背景技术】
目前在直下式（ direct light )的发光二极管（ light emitted diode LED )之背 光模块中， 发光二极管 （LED )是点状光源， 是依数组排列方式分布于背光架 构， 由于使用在背光的发光二极管光源为二维数组分布， 无论是薄型化还是减 少使用少颗数 LED都容易造成二维的亮暗条纹（mura ), 目前大多解决此亮暗 条纹（mura )是增加模组厚度来增加混光距离， 但是这不符合显示器轻薄化的 需求。
【发明内容】
本发明所要解决的技术问题是提供一种亮度均匀、 轻薄的 LED背光模组及 液晶显示装置。
本发明的目的是通过以下技术方案来实现的：
一种 LED背光模组， 包括反射板， 设置在反射板上的多个 LED、 与 LED 相对置的扩散板， 所述扩散板上设有多个均光结构。
优选的，所述扩散板的入光侧设有多个向 LED所在方向凸起的入光面网点， 形成所述均光结构。 入光面网点结构可以降低混光的高度以达到解决亮暗条纹 ( mura )和轻薄化的需求。
优选的， 所述多个入光面网点的大小一致， 所述入光面网点在 LED正上方 的排布密度大于在其它区域的排布密度。 LED在直下式背光设计中在 LED正上 方的位置会比较亮， 因此， 在此区域增加入光面网点的排布密度可以将更多的 光线反射回反射板进行二次反射混光， 这样就可以获得更均匀的亮度。 的效果， 以达到减少 LED颗数和降低混光高度的功能。
优选的， 所述向内 陷的出光面微结构的 陷部分为多面棱锥状。 此为一 种出光面微结构具体结构形式。
优选的， 所述出光面微结构为倒金字塔形状， 该出光面微结构由四个三角 形构成， 所述四个三角形的顶点想所述扩散板内部方向汇集， 所述四个三角形 的底边依次连接形成矩形。 此为多面棱锥状出光面微结构的一种具体结构形式。
优选的， 所述四个三角形为形状相同的三角形； 出光面微结构四个三角形 的底边两端依次连接形成正方形。 正方形的多面棱锥状出光面微结构扩光有更 好的一致性。 出光侧设有向内凹陷的出光面微结构； 所述入光面网点和出光面微结构共同形 成所述均光结构。 综合入光面网点和出光面微结构的优点， 在解决亮暗条纹 ( mura ) 问题、 减少 LED颗数、 提升扩散分光的效果、 实现 LED背光模组轻 薄化上有更优的表现。
优选的， 所述扩散板包括第一扩散板和层叠设置在第一扩散板出光面上方 的第二扩散板， 所述入光面网点位于所述第一扩散板的入光侧； 所述出光面微 结构位于所述第二扩散板的出光侧。 此为一种均光结构的具体实施方式。
一种液晶显示装置， 所述的液晶显示装置使用了上述的 LED背光模组。 本发明 LED背光模组由于在扩散板上设置了均光结构， 通过均光结构的反 射和散射效应， 增加混光距离和扩散分光的效果， 使 LED直下式背光减薄化， 减少 LED颗数使用， 且减轻亮暗条纹（mura ) 的现象。
【附图说明】
图 1是本发明的单个扩散板的实施方式示意图; 图 2是本发明的两个扩散板的实施方式示意图；
图 3是本发明的出光面微结构的一种具体形状的示意图；
其中： 1、 LED; 2、 入光面网点； 3、 出光面微结构； 4、 扩散板； 41、 第 一扩散板； 42、 第二扩散板； 5、 反射板。
【具体实施方式】
下面结合附图和较佳的实施例对本发明作进一步说明。
如图 1~3所示， 一种液晶显示装置的 LED1背光模组， 包括反射板 5, 设置 在反射板 5上的多个 LED1、 与 LED1相对置的扩散板 4, 所述扩散板 4上设有 多个均光结构。
为了形成所述均光结构， 可以在扩散板 4的入光侧设置向外凸起的肉眼可见 的入光面网点 2, 入光面网点 2结构可以降低混光的高度以达到解决亮暗条纹 ( mura )和轻薄化的需求； 也可以在扩散板 4的出光侧设置向内凹陷的肉眼可 见的出光面微结构 3, 出光面微结构 3图案设计使 LED1光源经过此出光面微结 构 3产生扩散分光的效果， 以达到减少 LED1颗数和降低混光高度的功能。 结 合入光面网点 2和出光面微结构 3的优点， 可以在一块扩散板 4的入光侧设置 向外凸起的入光面网点 2, 在出光侧设置向内凹陷的出光面微结构 3。 为了进一 步增强效果， 可以将扩散板 4分为第一扩散板 41和第二扩散板 42。 所述第一扩 散板 41的入光侧与 LED1相对置； 所述第二扩散板 42的入光侧与所述第一扩 散板 41的出光侧对置； 所述入光面网点 2位于所述第一扩散板 41的入光侧； 所述出光面微结构 3位于所述第二扩散板 42的出光侧。
优选的， 所述入光面网点 2大小一致， 其大小尺寸在同一数量级下可以有细 微差别， 所述入光面网点 2在 LED正上方的排布密度大于在其它区域的排布密 度。在 LED1正上方的排布密度大于其它区域。 LED在直下式背光设计中在 LED 正上方的位置会比较亮， 因此， 在此区域增加入光面网点的排布密度可以将更 多的光线反射回反射板进行二次反射混光， 这样就可以获得更均匀的亮度。 优选的， 所述出光面微结构 3为为多面棱锥状， 该出光面微结构 3可以由四 个三角形构成， 所述四个三角形的顶点想所述扩散板 4 内部方向汇集， 所述四 个三角形的底边依次连接形成矩形。 优选的， 所述四个三角形为形状相同的三 角形； 出光面微结构 3 四个三角形的底边两端依次连接形成正方形。 正方形的 多面棱锥状出光面微结构 3扩光有更好的一致性。
一种液晶显示装置， 所述的液晶显示装置使用了上述的 LED背光模组。
LED1在直下式背光设计中在 LED1正上方的位置会比较亮， 为了解决这个 问题可以扩散板 4入光侧布一些入光面网点 2来解决这种亮暗导致的亮暗条纹 ( mura ) 问题， 同时配合在扩散板 4的出光侧做一些出光面微结构 3 , 使 LED1 光源经过出光面微结构 3后产生扩散分光的作用使得光比较均匀以减轻亮暗条 纹（mura ) 的现象， 其原理是将 LED1的光源经过出光面微结构 3扩散板后可 以将光源分成数个虚拟光源可以有效达到分光的效果， 以上配合起来可以达到 比较好的解决亮暗条纹（mura ) 以及减少 LED1颗数和降低背光腔高度的作用。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不能 认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通技 术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干筒单推演或替换， 都应当视为属于本发明的保护范围。

Claims

权利要求
1、 一种 LED背光模组， 包括： 反射板， 设置在反射板上的多个 LED, 与 LED相对置的扩散板； 所述扩散板上设有多个均光结构。
2、 如权利要求 1所述的一种 LED背光模组， 其特征在于所述扩散板的入 光侧设有多个向 LED所在方向凸起的入光面网点， 形成所述均光结构。
3、 如权利要求 2所述的一种 LED背光模组， 其特征在于所述多个入光面 网点的大小一致， 所述入光面网点在 LED正上方的排布密度大于在其它区域的 排布密度。
4、 如权利要求 1所述的一种 LED背光模组， 其特征在于所述扩散板的出 光侧设有向内 陷的出光面微结构， 形成所述均光结构。
5、 如权利要求 4所述的一种 LED背光模组， 其特征在于所述向内凹陷的 出光面微结构的凹陷部分为多面棱锥状。
6、 权利要求 5所述的一种 LED背光模组， 其特征在于所述出光面微结构 为倒金字塔形状， 该出光面微结构由四个三角形构成， 所述四个三角形的顶点 想所述扩散板内部方向汇集， 所述四个三角形的底边依次连接形成矩形。
7、 权利要求 6所述的一种 LED背光模组， 其特征在于所述四个三角形为 形状相同的三角形； 出光面微结构四个三角形的底边两端依次连接形成正方形。
8、 权利要求 1所述的一种 LED背光模组， 其特征在于所述扩散板的入光 侧设有向外凸起的入光面网点， 所述扩散板的出光侧设有向内凹陷的出光面微 结构； 所述入光面网点和出光面微结构共同形成所述均光结构。
9、 权利要求 8所述的一种 LED背光模组， 其特征在于所述扩散板包括第 一扩散板和层叠设置在第一扩散板出光面上方的第二扩散板， 所述入光面网点 位于所述第一扩散板的入光侧； 所述出光面微结构位于所述第二扩散板的出光 侧。
10、 一种液晶显示装置， 所述的液晶显示装置使用了如权利要求 1所述的 LED背光模组；所述 LED背光模组包括：反射板，设置在反射板上的多个 LED, 与 LED相对置的扩散板； 所述扩散板上设有多个均光结构。
11、 如权利要求 10所述的一种液晶显示装置， 其特征在于所述扩散板的入 光侧设有多个向 LED所在方向凸起的入光面网点， 形成所述均光结构。
12、 如权利要求 11所述的一种液晶显示装置， 其特征在于所述多个入光面 网点的大小一致， 所述入光面网点在 LED正上方的排布密度大于在其它区域的 排布密度。
13、 如权利要求 10所述的一种液晶显示装置， 其特征在于所述扩散板的出 光侧设有向内 陷的出光面微结构， 形成所述均光结构。
14、 如权利要求 13所述的一种液晶显示装置， 其特征在于所述向内凹陷的 出光面微结构的凹陷部分为多面棱锥状。
15、 权利要求 14所述的一种液晶显示装置， 其特征在于所述出光面微结构 为倒金字塔形状， 该出光面微结构由四个三角形构成， 所述四个三角形的顶点 想所述扩散板内部方向汇集， 所述四个三角形的底边依次连接形成矩形。
16、 权利要求 15所述的一种液晶显示装置， 其特征在于所述四个三角形为 形状相同的三角形； 出光面微结构四个三角形的底边两端依次连接形成正方形。
17、 权利要求 10所述的一种液晶显示装置， 其特征在于所述扩散板的入光 侧设有向外凸起的入光面网点， 所述扩散板的出光侧设有向内凹陷的出光面微 结构； 所述入光面网点和出光面微结构共同形成所述均光结构。
18、 权利要求 17所述的一种液晶显示装置， 其特征在于所述扩散板包括第 一扩散板和层叠设置在第一扩散板出光面上方的第二扩散板， 所述入光面网点 位于所述第一扩散板的入光侧； 所述出光面微结构位于所述第二扩散板的出光 侧。
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