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CN102748667B - 直下式的背光模块及其液晶显示器 - Google Patents

直下式的背光模块及其液晶显示器 Download PDF

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CN102748667B
CN102748667B CN201210204446.7A CN201210204446A CN102748667B CN 102748667 B CN102748667 B CN 102748667B CN 201210204446 A CN201210204446 A CN 201210204446A CN 102748667 B CN102748667 B CN 102748667B
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supporting construction
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liquid crystal
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CN102748667A (zh
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张光耀
苏赞加
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/639,484 priority patent/US8777438B2/en
Priority to PCT/CN2012/079567 priority patent/WO2013189116A1/zh
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    • 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
    • G02F1/133603Direct backlight with LEDs
    • 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
    • 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
    • G02F1/133608Direct backlight including particular frames or supporting means
    • 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
    • G02F1/133611Direct backlight including means for improving the brightness uniformity

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  • Crystallography & Structural Chemistry (AREA)
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  • Planar Illumination Modules (AREA)
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Abstract

本发明公开了一种直下式背光模块,包括:一光学膜片;一扩散板,承载此光学膜片;一底板,设置于此扩散板的下方;多数个发光二极管,设置于此扩散板与此底板之间;以及多数个支撑结构,设置于此扩散板与此底板之间并固定于此底板上,且每一此支撑结构设置于两相邻此发光二极管之间,以及每一此支撑结构的高度小于底板到扩散板之间的距离。本发明可改善在扩散板上的阴影问题。

Description

直下式的背光模块及其液晶显示器
技术领域
本发明是有关于一种直下式背光模块及其使用此直下式背光模块的液晶显示器,特别是有关于一种具有可减少阴影的支撑结构。
背景技术
近年来,使用发光二极管(Light-Emitting Diode,LED)的直下式背光模块具有容易于区域调光、均齐度高、无汞污染等优点受到广泛重视。直下式发光二极管背光模块有两种常见的实现形式,一种为直接采用表面黏贴型发光二极管(通常需要的发光二极管数量较多),第二种为表面黏贴型发光二极管搭配二次透镜(可减少发光二极管的颗数)。但是无论采用哪种实现形式,扩散板都需要有支撑结构来防止其由于热涨冷缩和运输过程中的振荡而引起的形变,造成品味问题或者击伤发光二极管(当腔体高度较低时)。
请参阅图1,为现有的直下式背光模块部分结构图。背光模块9包括:一光学膜片940、一扩散板960、一底板910、多数个发光二极管920及多数个支撑结构930,为方便说明,图1只显示两个发光二极管920及一个支撑结构930。
扩散板960上方承载此光学膜片940;底板910设置于扩散板960的下方;发光二极管920设置于扩散板960与底板910之间;支撑结构930设置于扩散板960与底板910之间,且一端固定于底板910上,另一端与扩散板960连接。
请参阅图3,为发光二极管加上二次透镜的配光曲线图。图中的黑线8为蝙蝠散射光型的发光二极管,在不同的角度有不同的发光强度比,且从图3中可看出,发光二极管两侧光的强度比中间还强。
请参阅图2,当发光二极管920发光时,是以蝙蝠散射光型的方式发光,当光线经过支撑结构930时,光线会被支撑结构930档住,而无法穿透,因此在扩散板960上会产生阴影950。
因此,便需要提供一种背光模块及其显示器,使支撑结构不会在扩散板上产生阴影的装置,以解决前述的问题。
发明内容
本发明的目的在于,克服现有的背光模块的支撑结构,造成在扩散板上产生暗点的问题,而提供一种新型背光模块,所要解决一技术问题是使其可以解决因为支撑结构档到光线的路径,因而在扩散板上产生阴影,严重影响画面的质量。
本发明的次要目的在于,克服现有的液晶显示器中的背光模块的支撑结构,在扩散板上产生暗点的问题,而提供一种新型背光模块,所要解决一技术问题是使其可以解决因为支撑结构档到光线的路径,因而在扩散板上产生阴影,严重影响画面的质量。
为达成上述提供的目的,本发明提出的直下式背光模块,包括:一光学膜片;一扩散板,承载此光学膜片;一底板,设置于此扩散板的下方;多数个发光二极管,设置于此扩散板与此底板之间;以及多数个支撑结构,设置于此扩散板与此底板之间并固定于此底板上,且每一此支撑结构设置于两相邻此发光二极管之间,以及每一此支撑结构的高度小于底板到扩散板之间的距离。
前述的直下式背光模块,从此底板到此扩散板的距离为一腔体高度HC,从此底板到此支撑结构的顶端的距离为一支撑结构高度HS,从此支撑结构到此发光二极管的距离为一间距S,其中此腔体高度HC、此支撑结构高度HS以及此间距S需满足(HC-HS)×S/HS≧3.5毫米。
前述的直下式背光模块,此支撑结构的表面为抛光面、磨砂面、反射面或散射面。
前述的直下式背光模块,此支撑结构的横切面为圆形、椭圆形、规则多边形、不规则多边形或锯齿形。
前述的直下式背光模块,此支撑结构为角锥体、圆锥体、圆柱体或棱柱体。
为达成上述提供的目的,本发明提出的液晶显示器,包括:一液晶面板;一直下式背光模块,用以提供光源给此液晶面板,包括:一光学膜片;一扩散板,承载此光学膜片;一底板,设置于此扩散板的下方;多数个发光二极管,设置于此扩散板与此底板之间;以及多数个支撑结构,设置于此扩散板与此底板之间并固定于此底板上,且每一此支撑结构设置于两相邻此发光二极管之间,以及每一此支撑结构的高度小于底板到扩散板之间的距离。
前述的液晶显示器,此支撑结构的表面为抛光面、磨砂面、反射面或散射面。
前述的液晶显示器,此支撑结构的横切面为圆形、椭圆形、规则多边形、不规则多边形或锯齿形。
前述的液晶显示器,此支撑结构为角锥体、圆锥体、圆柱体或棱柱体。
综上所述,本发明的直下式背光模块及其使用此直下式背光模块的液晶显示器其效果在于,利用缩短支撑结构的高度,使支撑结构与光学膜片之间有一空间,让发光二极管所发出的光由支撑结构与扩散板之间穿透,进而改善在扩散板上的阴影问题。
上述说明仅是本发明技术方案的概述,为了能够更清楚了解本发明的技术手段,并可依照说明书的内容予以实施,以下以本发明的较佳实施例并配合附图详细说明如后。
附图说明
图1是现有的直下式背光模块部分结构图;
图2是当发光二极管发光时现有的直下式背光模块部分结构图;
图3是发光二极管加上二次透镜的配光曲线图;
图4是本发明实施例的直下式背光模块部份剖面图;以及
图5是本发明实施例的液晶显示器示意图。
具体实施方式
以下结合附图所示的较佳实施例作进一步详述。
图4为本发明实施例的直下式背光模块部份剖面图。如图4所示,直下式背光模块1包括一光学膜片140、一扩散板160、一底板110、多数个发光二极管120及多数个支撑结构130,为方便说明,图4只显示两个发光二极管120及一个支撑结构130。
扩散板160的上方承载此光学膜片140;底板110设置于此扩散板160的下方;发光二极管120设置于扩散板160与底板110之间,并固定于底板110上;支撑结构130设置于扩散板160与底板110之间并固定于底板110上,且每一支撑结构130设置于两相邻的发光二极管120之间,以及每一支撑结构130的高度小于底板110到扩散板160之间的距离。
上述中底板110到扩散板160的距离定义为一腔体高度HC,从底板110到支撑结构130的顶端的距离定义为一支撑结构高度HS,从支撑结构130到发光二极管120的距离定义为一间距S,其中腔体高度HC、支撑结构高度HS以及间距S,上述三者的关系需满足(HC-HS)×S/HS≧3.5毫米。当发光二极管120发光时,光线可以直接穿过支撑结构130,因此在扩散板160的阴影150就会变淡。
上述中的光学膜片140由下而上依序为0度棱镜片、90度棱镜片及增光片,在此则不以为限。上述中的底板110可为一反射片,增加光线的使用效率。上述中支撑结构130的材质为硬质材料,例如压克力材料、塑胶材料或金属材料等硬质材料。支撑结构130的表面可为抛光面、磨砂面、反射面或散射面。支撑结构130的横切面为圆形、椭圆形、规则多边形、不规则多边形或锯齿形。支撑结构130的外形为角锥体、圆锥体、圆柱体或棱柱体。
图5为本发明实施例的液晶显示器示意图。液晶显示器2包括一液晶面板210及一直下式背光模块220。此直下式背光模块220用以提供光源至此液晶面板210,以显示一影像。在本发明实施例中,此直下式背光模块220为前述中本发明施实例所揭露的直下式背光模块220。其中此液晶显示器2还包括胶框、前框、背板以及散热片等元件,但上述的元件以及相关结构为现有的技术,在此则不于赘述。
由上述可知,本发明的直下式背光模块及其使用此直下式背光模块的液晶显示器其效果在于,利用缩短支撑结构的高度,使支撑结构与光学膜片之间有一空间,让发光二极管所发出的光由支撑结构与光学膜片之间穿透,进而改善在光学膜片上的阴影问题。
以上,仅为本发明的较佳实施例,意在进一步说明本发明,而非对其进行限定。凡根据上述的文字和附图所公开的内容进行的简单的替换,都在本专利的权利保护范围之列。

Claims (8)

1.一种直下式背光模块,其特征在于,包括:
一光学膜片;
一扩散板,承载所述的光学膜片;
一底板,设置于所述的扩散板的下方;
多数个发光二极管,设置于所述的扩散板与所述的底板之间;以及
多数个支撑结构,设置于所述的扩散板与所述的底板之间并固定于所述的底板上,且每一所述的支撑结构设置于两相邻所述的发光二极管之间,以及每一所述的支撑结构的高度小于底板到扩散板之间的距离;
其中,从所述的底板到所述的扩散板的距离为一腔体高度HC,从所述的底板到所述的支撑结构的顶端的距离为一支撑结构高度HS,从所述的支撑结构到相邻所述的发光二极管的距离为一间距S,其中所述的腔体高度HC、所述的支撑结构高度HS以及所述的间距S需满足(HC-HS)×S/HS≧3.5毫米。
2.如权利要求1所述的直下式背光模块,其特征在于,所述的支撑结构的表面为抛光面、磨砂面、反射面或散射面。
3.如权利要求1所述的直下式背光模块,其特征在于,所述的支撑结构的横切面为圆形、椭圆形、规则多边形、不规则多边形或锯齿形。
4.如权利要求1所述的直下式背光模块,其特征在于,所述的支撑结构为角锥体、圆锥体、圆柱体或棱柱体。
5.一种液晶显示器,其特征在于,包括:
一液晶面板;以及
一直下式背光模块,用以提供光源给所述的液晶面板,包括:
一光学膜片;
一扩散板,承载所述的光学膜片;
一底板,设置于所述的扩散板的下方;
多数个发光二极管,设置于所述的扩散板与所述的底板之间;以及
多数个支撑结构,设置于所述的扩散板与所述的底板之间并固定于所述的底板上,且每一所述的支撑结构设置于两相邻所述的发光二极管之间,以及每一所述的支撑结构的高度小于底板到扩散板之间的距离;
其中,从所述的底板到所述的扩散板的距离为一腔体高度HC,从所述的底板到所述的支撑结构的顶端的距离为一支撑结构高度HS,从所述的支撑结构到相邻所述的发光二极管的距离为一间距S,其中所述的腔体高度HC、所述的支撑结构高度HS以及所述的间距S需满足(HC-HS)×S/HS≧3.5毫米。
6.如权利要求5所述的液晶显示器,其特征在于,所述的支撑结构的表面为抛光面、磨砂面、反射面或散射面。
7.如权利要求5所述的液晶显示器,其特征在于,所述的支撑结构的横切面为圆形、椭圆形、规则多边形、不规则多边形或锯齿形。
8.如权利要求5所述的液晶显示器,其特征在于,所述的支撑结构为角锥体、圆锥体、圆柱体或棱柱体。
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