CN101354449A - 背光模组及其光学板 - Google Patents

背光模组及其光学板 Download PDF

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CN101354449A
CN101354449A CNA2007102011513A CN200710201151A CN101354449A CN 101354449 A CN101354449 A CN 101354449A CN A2007102011513 A CNA2007102011513 A CN A2007102011513A CN 200710201151 A CN200710201151 A CN 200710201151A CN 101354449 A CN101354449 A CN 101354449A
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optical sheet
light source
scattering layer
accommodation section
light
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CN101354449B (zh
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章绍汉
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • 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
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031Reflecting element, sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073Light emitting diode [LED]
    • 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
    • G02F1/133607Direct 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

Abstract

一种光学板,其包括至少一个光学板单元,该光学板单元包括出光面、与该出光面相对的底面及形成于该出光面的散射层,该底面形成有多个长条状V型凸起,且该底面开设有至少一个光源容纳部。本发明还提供一种采用上述光学板的背光模组。上述背光模组具有出光均匀的优点。

Description

背光模组及其光学板
技术领域
本发明涉及一种背光模组及其光学板,尤其涉及一种用于液晶显示的背光模组及其光学板。
背景技术
由于液晶显示器面板的液晶本身不具发光特性,因而为达到显示效果需给液晶显示器面板提供一面光源装置,如背光模组。背光模组的作用是向液晶显示器面板供应亮度充分且分布均匀的面光源。
请参见图1,所示为一种现有的背光模组100,其包括框架101、反射板102、扩散板103、棱镜片104及至少一个发光二极管105。框架101包括一底板1011及多个从该底板1011边缘向其同一侧垂直延伸的侧壁1013。底板1011与多个侧壁1013共同形成一腔体1017。发光二极管105包括出光部1051与基部1053,基部1053与电路板(未标示)相连并固定于底板1011。扩散板103与棱镜片104依次设置于多个侧壁1013顶部。反射板102为一个小框体结构,其可配置于框架101内部。反射板102的底部开设有与发光二极管105相对应的通孔(未标示),发光二极管105的出光部1051穿过相应通孔。发光二极管105的基部1053顶持该反射板102。
工作时,发光二极管105产生的光线被反射板102反射进入扩散板103,在扩散板103中被均匀扩散后光线继续进入棱镜片104,在棱镜片104的作用下,出射光线发生一定程度的聚集,使得背光模组在特定视角范围内的亮度提高。
然而,由于发光二极管105为点光源,其到达扩散板103上各处的距离大小不相等,位于发光二极管105正上方的扩散板103单位区域所接受光较多,位于发光极管105四周的扩散板103单位区域所接受光较少,因此容易在发光二极管105正上方的区域形成亮区,而在其上方的四周区域形成暗区,影响背光模组100的出光均匀性。为此,通常需在发光二极管105的上方设置反射片106,以控制发光二极管105正上方的出光量。发光二极管105与反射片106的搭配设计,可一定程度上减弱发光二极管105正上方的亮区,但是背光模组100仍然存在出光不均的缺点。
发明内容
鉴于上述状况,有必要提供一种出光均匀的背光模组及其光学板。
一种光学板,其包括至少一个光学板单元,该光学板单元包括出光面、与该出光面相对的底面及形成于该出光面的散射层,该底面形成有多个长条状V型凸起,且该底面开设有至少一个光源容纳部。
一种背光模组,其包括框架、至少一个点光源及光学板;该框架包括底板及多个从该底板边缘延伸的相互连接的侧壁,该多个侧壁与该底板形成一个腔体;该至少一个具有出光部的点光源设于该底板;该光学板设置于该腔体内,该光学板包括至少一个光学板单元,该光学板单元包括出光面及与该出光面相对的底面,该底面形成有多个长条状V型凸起,且该底面开设有至少一个光源容纳部,该光学板还包括一个形成于该出光面的散射层;该点光源的出光部相应设置于该光源容纳部内。
上述背光模组的光学板之光学板单元包括光源容纳部、形成于底面的多个长条状V型凸起以及形成于出光面的散射层,点光源的出光部容纳在光源容纳部内。从点光源发出的光线通过光源容纳部的内侧壁直接进入光学板内部。由于光学板底面设置的长条状V型凸起具有变化的表面结构,使得光线在光学板内传输至长条状V型凸起时,长条状V型凸起可将部分原来在未设有长条状V型凸起的光学板内全反射传播的光线调节后从底面出射,在框架的反射作用下,此部分光线经多次折射后进入散射层,并经散射层均匀扩散后从腔体开口均匀出射,因此背光模组的光学利用率与出光均匀性得以提高。更进一步地,点光源所发射的光线大部分于光学板内向四周传播,点光源被转变成面光源,从而使得采用该光学板的背光模组不会因为点光源至扩散板的距离过小而在点光源上方的区域产生亮点,因此,背光模组可进行降低灯箱高度的设计;而且采用此具有散射层的光学板的背光模组可省略现有扩散板的使用,从而使背光模组的成本减少、厚度降低。
附图说明
图1是一种现有的背光模组的剖视图。
图2是本发明较佳实施例一的背光模组的剖视图。
图3是图2所示背光模组的光学板的立体图。
图4是图3所示光学板沿III-III线的剖视图。
图5是本发明较佳实施例二的光学板的剖视图。
图6是本发明较佳实施例三的光学板的剖视图。
图7是本发明较佳实施例四的光学板的剖视图。
图8至图10是本发明的光学板的散射层的各种分布示意图。
具体实施例
下面将结合附图及实施例对本发明的背光模组及其光学板作进一步的详细说明。
请参见图2,所示为本发明较佳实施例一的背光模组200,其包括一个框架21、一个反射板22、一个侧光式点光源25及一块光学板20。框架21包括一块长方形底板211及四个从底板211边缘向其同一侧垂直延伸并相互连接的侧壁213。四个侧壁213与底板211共同形成一个腔体217,用于收容点光源25、反射板22及光学板20等元件。
请参见图3,光学板20为矩形板,其包括一个出光面202、一个与该出光面202相对的底面203。底面203中央开设有一个光源容纳部204,光源容纳部204为从底面203贯穿至出光面202的通孔。出光面202形成一均匀厚度的散射层205,底面203形成多个长条状V型凸起206。
散射层205包括透明树脂2052和均匀掺杂在透明树脂2052中的散射粒子2054。透明树脂2052优选丙烯酸树脂或环氧树脂。散射粒子2054掺入透明树脂2052中,其可选自以下的一种或多种粒子:二氧化硅颗粒、聚甲基丙烯酸甲酯颗粒和玻璃微珠等。
本实施例中,该多个长条状V型凸起206沿X轴方向延伸,且相邻长条状V型凸起206紧密连接。请参见图4,每个长条状V型凸起206的顶角θ的较佳取值范围为60至120度。相邻长条状V型凸起206的间距D优选0.025毫米至2毫米。
可以理解,长条状V型凸起206的延伸方向也可为Y轴方向或与光学板20的侧边形成一个锐角夹角,此设计可进一步控制出射光的出射角度。
请再参阅图2,点光源25优选为侧光式发光二极管,其包括一个基部253、一个固定于基部253上方的出光部251与一个反射片255。点光源25通过电路板(未标示)固定于底板211。光学板20设置在腔体217内,其出光面202面向腔体217的开口。点光源25的出光部251容纳于光学板20的光源容纳部204内。反射片255设置在对应点光源25正上方的位置,用于覆盖点光源25的顶部。反射片255的面积等于或略大于出光部251的投影面积。反射板22开设有一个对应于点光源25的出光部251的通孔(未标示)。反射板22设置在光学板20底面203的下方,点光源25的出光部251穿过该通孔。
点光源25从出光部251发出的光线通过光源容纳部204的内侧壁直接进入光学板20内部。由于光学板20的底面203设置有长条状V型凸起206,长条状V型凸起206可将部分原来在未设有长条状V型凸起206的光学板20内全反射传播的光线调节后从底面203出射,在反射板22的辅助作用下,此部分光线多次折射后进入散射层205,并经散射层205均匀扩散后从腔体开口均匀出射,因此背光模组的光学利用率与出光均匀性得以提高。更进一步地,由于采用侧光式点光源25,点光源25所发射的光线大部分于光学板20内向四周传播,点光源被转变成面光源,从而使得采用该光学板的背光模组不会因为点光源至扩散板的距离过小而在点光源上方的区域产生亮点,因此,背光模组可进行降低灯箱高度的设计;而且采用此具有散射层205的光学板的背光模组可省略现有扩散板103的使用,从而使背光模组的成本减少、厚度降低。
背光模组200还可在四个侧壁213顶部增加一个棱镜片24,用于提高该背光模组200在特定的视角范围内的均匀亮度。为使光束于腔体内均匀混光和提高光线利用率,该反射板22可进一步包括多个反射侧壁223。另外需要强调的是:本实施例的反射板22可省略,尤其当框架21为高反射材料制成,或在底板211及侧壁213内侧涂覆高反射涂层时。
请参见图5,所示为本发明较佳实施例二的光学板30。该光学板30与较佳实施例一的光学板20相似,其不同在于光学板30的长条状V型凸起306的顶角以及相邻长条状V型凸起306形成的底部夹角均被圆角化,分别形成圆角R1和R2。该R1和R2的圆角的取值范围优选为大于0且小于或等于1.1毫米。被圆角化的长条状V型凸起306可使出射光束的出射角度的变化趋于缓和,使采用光学板30的背光模组的出光均匀性进一步提高。可以理解,也可于长条状V型凸起306的顶角以及相邻长条状V型凸起306形成的底部夹角的其中之一单独进行上述圆角化设计。
请参见图6,所示为本发明较佳实施例三的光学板40。该光学板40与较佳实施例一的光学板20相似,其不同在于光学板40的光源容纳部404为开设于底面403的盲孔。采用光学板40的背光模组可搭配一个未设反射元件的侧光式点光源,或者在盲孔底部直接涂覆高反射层。
请参见图7,所示为本发明较佳实施例四的光学板50。该光学板50与较佳实施例一的光学板20相似,其不同在于光学板50的散射层505为不连续分布。本实施例中,散射层505为网点状中心对称排布。
上述实施例中,光学板20、30、40、50都为一整体结构。本发明的大尺寸的光学板可由若干个上述整体结构的光学板单元组合而成,或者每个光学板单元开设多个光源容纳部。光学板20、30、40、50的形状除矩形外,还可为多边形或圆形等。
本发明的光学板单元或组合光学板可设置多个光源容纳部,配合该多个光源容纳部,可采用不同颜色的侧光式发光二极管制成白光混光背光模组,或者采用相同颜色的侧光式发光二极管制成特定颜色的背光模组。
上述各实施例中光学板的间隔的散射层的分布还可以有以下变换设计。
如图8所示,散射层605在出光面602的分布为:以光源容纳部604为中心,多个矩形状的封闭式散射层605间隔分布,且越远离光源容纳部604,矩形状的封闭式散射层605的宽度越大,此设计有利于提高光学板的出光均匀性。
如图9所示,散射层705在出光面702的分布为:以光源容纳部704为圆心,多个网点状散射层705沿着圆环形轨道间隔分布,且越远离光源容纳部704,网点状的散射层705的面积越大,此设计有利于提高光学板的出光均匀性。
如图10所示,散射层805在出光面802的分布为:以光源容纳部804为圆心,多个相同大小的网点状的散射层805沿着圆环形轨道间隔分布,且越远离光源容纳部804,网点状的散射层805的排布密度越大,此设计有利于提高光学板的出光均匀性。
另外,本领域技术人员还可在本发明精神内做其它变化,当然,这些依据本发明精神所做的变化,都应包含在本发明所要求保护的范围内。

Claims (10)

1.一种光学板,其包括至少一个光学板单元,该光学板单元包括出光面及与该出光面相对的底面,其特征在于:该底面形成有多个长条状V型凸起,且该底面开设有至少一个光源容纳部,该光学板还包括一个形成于该出光面的散射层。
2.如权利要求1所述的光学板,其特征在于:该每个长条状V型凸起的顶角为60至120度;相邻长条状V型凸起的间距为0.025毫米至2毫米。
3.如权利要求1所述的光学板,其特征在于:该散射层包括透明树脂和掺杂在透明树脂中的散射粒子。
4.如权利要求3所述的光学板,其特征在于:该透明树脂为丙烯酸树脂或环氧树脂;该散射粒子为二氧化硅颗粒、聚甲基丙烯酸甲酯颗粒和玻璃微珠中的一种或一种以上组合。
5.如权利要求1所述的光学板,其特征在于:该长条状V型凸起的顶角、相邻长条状V型凸起形成的底部夹角的至少其中之一被圆角化处理。
6.如权利要求1所述的光学板,其特征在于:该散射层为连续分布或间隔分布。
7.如权利要求6所述的光学板,其特征在于:该间隔分布的散射层有以下分布:以光源容纳部为中心,多个矩形状的封闭式散射层间隔分布,且越远离光源容纳部,矩形状的封闭式散射层的宽度越大;以光源容纳部为圆心,多个网点状的散射层沿着圆环形轨道间隔分布,且越远离光源容纳部,网点状的散射层的面积越大;以光源容纳部为圆心,多个相同大小的网点状的散射层沿着圆环形轨道间隔分布,且越远离光源容纳部,网点状的散射层的排布密度越大。
8.如权利要求1所述的光学板,其特征在于:该光源容纳部为通孔与盲孔之一。
9.一种背光模组,其包括框架、至少一个侧光式点光源及光学板;该框架包括底板及多个从该底板边缘延伸的相互连接的侧壁,该多个侧壁与该底板形成一个腔体;该至少一个具有出光部的点光源设于该底板;该光学板设置于该腔体内,该光学板包括至少一个光学板单元,该光学板单元包括出光面及与该出光面相对的底面,其特征在于:该底面形成有多个长条状V型凸起,且该底面开设有至少一个光源容纳部,该光学板还包括一个形成于该出光面的散射层,该点光源的出光部相应设置于该光源容纳部内。
10.如权利要求10所述的背光模组,其特征在于:该背光模组还包括一反射板,该反射板设有至少一通孔,该反射板设置于该光学板下方,该点光源的出光部相应穿过该通孔。
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