CN101140335A - 导光板及背光模组 - Google Patents

导光板及背光模组 Download PDF

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CN101140335A
CN101140335A CNA2006100625130A CN200610062513A CN101140335A CN 101140335 A CN101140335 A CN 101140335A CN A2006100625130 A CNA2006100625130 A CN A2006100625130A CN 200610062513 A CN200610062513 A CN 200610062513A CN 101140335 A CN101140335 A CN 101140335A
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guide plate
light guide
site
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incidence surface
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廖明毅
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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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Priority to US11/617,615 priority patent/US7441936B2/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • 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
    • 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
    • G02B6/0058Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/20Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
    • 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
    • G02B6/00362-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • 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
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

本发明涉及一种导光板及背光模组。该导光板包括一入光面;一与该入光面相连的出光面;一与该出光面相对的底面,该底面形成有多个网点,该多个网点呈列状分布,每一列均与入光面轴向方向平行,每一列中相邻网点几何中心的距离相等,且离该入光面越远的列,其网点的大小越大;且越远离该入光面,每列网点的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,网点密度越大。本发明还提供采用上述导光板的背光模组,其能有效减少于导光板出光面靠近入光面部分出现亮线。

Description

导光板及背光模组
技术领域
本发明涉及一种应用于液晶显示装置的导光板,以及采用该导光板的侧置式背光模组。
背景技术
由于液晶显示器面板的液晶本身不具有发光特性,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,其作用在于向液晶显示器面板供应辉度充分且分布均匀的面光源。
现有技术的背光模组主要由光源、导光板、反射板、扩散片与棱镜片组成。该光源可设置于导光板一侧或两相对侧并将光线发射至该导光板。该导光板的作用在于引导光线传输方向,使光线由导光板的出光面均匀出射,反射板相对该导光板的底面设置,以将由导光板底面出射的光线再次反射入该导光板内,提高光线的利用率。扩散片与棱镜片相对导光板的出光面依次设置,以使由导光板出射的光线分布更加均匀,进而提高液晶显示器面板的辉度与均匀性。
依导光板的形状,其可分为平板形导光板与楔形导光板。另外,为增加导光板的出光效率与均匀性,通常在导光板之一面设置V形槽或配置网点,该V形槽或网点于导光板上分布的距离与大小可有不同设计。当光线传输至V形槽或网点时,光线将发生反射与散射,并向各个不同方向传输,最终由导光板的出光面射出。利用各种疏密、大小不同的V形槽或网点,可使导光板发光均匀。
如图1所示,一种现有技术的背光模组10。该背光模组10包括一导光板11、一光源12、一反射板15及一扩散片16。该导光板11包括一入光面112,一与入光面112相连的出光面114及一与出光面114相对的底面116。该光源12靠近该入光面112设置。该反射板15设置于该底面116下方。该扩散片16设置于该出光面114的上方。其中,为有效利用光源12所发出的光线,该背光模组10还包括一反射灯罩17,其围绕该光源12。为破坏光线于导光板11内部传输的全反射条件,该导光板11底面又设置多个呈行列状排布的圆形网点118。
如图2所示,其为网点118于该导光板11底面116的分布示意图。该多个网点118沿与导光板11入光面112的平行方向排布成多列,并且每一列中网点118的大小相同。该多个网点118沿与导光板11入光面112轴向垂直的方向排布成多行,并且每一行中网点118的大小不同,其中,靠近入光面112的网点118的直径最小,随着与光源2距离的增大,该网点118也逐渐变大。
如图3所示,该导光板11的网点分布采用等间距(Pitch)设计,即同一列的多个网点118的中心连线X1与相邻列的多个网点118的中心连线X2的垂直距离Ypitch相等。由于靠近入光面112的网点118尺寸较小,所以,靠近入光面112的相邻列的间隙也就较大。该多个间隙为线形平齐排列,应用于显示面板,靠近入光面112的区域将可能产生多条亮线,从而直接降低显示品质。
有鉴于此,提供一种能减少于导光板出光面靠近入光面处出现亮线以提高光学均匀性的导光板和背光模组实为必要。
发明内容
下面将以若干实施例说明一种能减少于导光板出光面靠近入光面出现亮线的导光板,以及一种采用该导光板的背光模组。
一种导光板,其包括一入光面;一与该入光面相连的出光面;一与该出光面相对的底面,该底面形成有多个网点,该多个网点呈列状分布,每一列均与入光面轴向方向平行,每一列中相邻网点几何中心的距离相等,且离该入光面越远的列,其网点的大小越大;且越远离入光面,每列网点的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,网点密度越大。
一种背光模组,其包括至少一光源及一导光板,该导光板包括一靠近该光源的入光面;一与该入光面相连的出光面;一与该出光面相对的底面,该底面形成有多个网点,该多个网点呈列状分布,每一列均与入光面轴向方向平行,每一列中相邻网点几何中心的距离相等,且离该入光面越远的列,其网点的大小越大;且越远离入光面,每列网点的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,网点密度越大。
与现有技术相比较,本实施例的导光板采用非等间距(Pitch)设计:靠近入光面的相同列网点大小较小,且列与列之间的间隙可控制于适当的较小范围,从而避免靠近入光面的区域产生多条亮线以提高背光模组的光学均匀性。
附图说明
图1是现有技术背光模组侧视图。
图2是图1所示导光板底面网点分布示意图。
图3是图2局部III的放大示意图。
图4是本发明背光模组较佳实施例的侧视图。
图5是图4所示背光模组的导光板底面网点分布示意图。
图6是本发明导光板较佳实施例一的底面网点分布示意图。
图7是本发明导光板较佳实施例二的底面网点分布示意图。
图8是本发明导光板较佳实施例三的底面网点分布示意图。
具体实施方式
下面将结合附图和多个实施例对本发明背光模组及其导光板作进一步的详细说明。
请参阅图4,本发明背光模组20的较佳实施例一。该背光模组20包括一导光板21及一光源22。该导光板21包括一入光面212;一与该入光面212相连的出光面214;一与该出光面214相对的底面216,该底面216形成有多个网点218。该光源22靠近该导光板21入光面212设置。该光源22可选用冷阴极荧光灯管或发光二极管。该导光板21可由聚碳酸酯(PC)、聚甲基丙烯酸甲酯(PMMA),或者其他适合的透明合成树脂材料制成。
请参阅图5,该多个网点218呈列状分布。每一列均与入光面212轴向方向(X轴方向)平行,每一列中相邻网点218的几何中心间距相等。离该入光面212越远的列,其网点218的大小越大。其中,一列网点218的几何中心的连线Yn与其远离入光面212的相邻列网点218的几何中心连线Yn+1的垂直距离为Ypitch_n,该列网点218的几何中心的连线Yn+1与其远离入光面212的相邻列网点218的几何中心连线Yn+2的垂直为Ypitch_(n+1)。Ypitch_(n+1)比Ypitch_n大。本实施例中,最靠近入光面212的第一列网点218与其相邻列网点218的距离Ypitch_1最小,综上所述,越远离入光面212,每列网点218的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,且单位面积内网点面积所占的比值越大,即网点密度越大。
本实施例中每一列的网点218大小相等。需要指出的是,针对选用不同的光源,每一列中网点218可以有大小不相等的设计:如每一列中,中间的网点218最小,且越靠近两端,网点218的大小逐渐增大;或者是:每一列中,中间的网点218最大,且越靠近两端,网点218的大小逐渐变小。
本实施例中的网点218为正方形,其面积范围为1×10-7平方毫米至1×104平方毫米。本发明的多个网点218可通过油墨印刷的方式形成油墨网点,或者通过掩模进行化学蚀刻产生具有微细散射雾面的网点。本实施例该多个网点218采用通过油墨印刷的方式形成于该导光板21的底面216,该多个网点218包括一般的油墨网点或含有散射剂的油墨网点。
由于越远离入光面212,网点密度(单位面积内网点面积所占比例)越大,背光模组的光学均匀性可获得保证。而且本发明导光板21的网点分布在Y轴方向上,采用非等间距(Pitch)设计:靠近入光面212的相同列网点218大小较小,但列与列之间的间隙可控制于适当的较小范围,从而避免靠近入光面112的区域产生多条亮线以提高背光模组20的光学均匀性。
请参阅图6,本发明导光板的较佳实施例一。该导光板31与上述导光板21的结构大致相似,其不同在于:该导光板31具有相对的两入光面312,以及其底面316的网点318分布相应改变。本实施例中,导光板31两入光面312之间定义一中心轴线X6,且每个入光面312与该中心轴线X6之间,越远离该入光面312,每列网点的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,网点密度越大。可以理解的是,考虑到两个入光面可能接收不同强度的光束,本发明网点分布可采用非对称设计,即该中心轴线可被替选为该两入光面之间的任意一轴线。
请参阅图7,本发明导光板的较佳实施例二。该导光板41与较佳实施例一的导光板31的结构大致相似,其不同在于其网点418为正八边形结构。
请参阅图8,本发明导光板的较佳实施例三。该导光板51与较佳实施例一的导光板31的结构大致相似,其不同在于其网点518为七边形结构。
参考上述实施例,可以理解的是,本发明的网点形状可进行各种变化设计,其形状可包括圆点及任意多边形之
可以理解的是,上述本发明导光板的多个较佳实施例都可搭配所需光源组装成本发明的背光模组。
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)

1.一种导光板,其包括:一入光面;一与该入光面相连的出光面;一与该出光面相对的底面,该底面形成有多个网点,该多个网点呈列状分布,每一列均与入光面轴向方向平行,每一列中相邻网点几何中心的距离相等,且离该入光面越远的列,其网点的大小越大,其特征在于:越远离该入光面,每列网点的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,网点密度越大。
2.如权利要求1所述的导光板,其特征在于:该多个网点的形状分别为圆点及多边形之一。
3.如权利要求1所述的导光板,其特征在于:该多个网点为油墨网点及具有微细散射雾面的网点之一。
4.如权利要求1所述的导光板,其特征在于:该网点面积范围为1×10-7平方毫米至1×104平方毫米。
5.如权利要求1所述的导光板,其特征在于:相邻列之间的网点错开一定距离。
6.如权利要求1所述的导光板,其特征在于:该导光板包括两相对的入光面,两入光面之间定义一轴线,每入光面与该轴线之间,越远离该入光面,每列网点的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,网点密度越大。
7.如权利要求6所述的导光板,其特征在于:该轴线为两入光面之间的中心轴线。
8.一种背光模组,其包括至少一光源及一导光板,该导光板包括一靠近该光源的入光面;一与该入光面相连的出光面;一与该出光面相对的底面,该底面形成有多个网点,该多个网点呈列状分布,每一列均与入光面轴向方向平行,每一列中相邻网点几何中心的距离相等,且离该入光面越远的列,其网点的大小越大,其特征在于:越远离入光面,每列网点的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,且网点密度越大。
9.如权利要求8所述的导光板,其特征在于:该多个网点的形状分别为圆点及多边形之一。
10.如权利要求8所述的导光板,其特征在于:该导光板包括两相对的入光面,两入光面之间定义一轴线,每入光面与该轴线之间,越远离该入光面,每列网点的几何中心的连线与其相邻列网点的几何中心连线的垂直距离越大,网点密度越大。
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