CN101295038A - 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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CN101295038A
CN101295038A CNA2007102005279A CN200710200527A CN101295038A CN 101295038 A CN101295038 A CN 101295038A CN A2007102005279 A CNA2007102005279 A CN A2007102005279A CN 200710200527 A CN200710200527 A CN 200710200527A CN 101295038 A CN101295038 A CN 101295038A
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optical sheet
microprotrusion
optical
light
plate
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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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Priority to US11/850,041 priority patent/US20080266879A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means 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
    • G02B6/002—Means 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
    • G02B6/0021—Means 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means 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
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means 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
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means 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
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means 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
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

Abstract

一种光学板，其包括至少一个光学板单元，该光学板单元包括第一表面及与该第一表面相对的第二表面。该第一表面形成有多个微凸起，每个微凸起包括至少三个相互连接的侧面，每个侧面的水平宽度沿远离第一表面的方向逐渐缩小。该第二表面形成多个球面凹槽。该第一表面和第二表面之至少一表面开设有光源容纳部。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周围的扩散板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，而在其上方的周围区域形成暗区，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，该光学板单元包括第一表面及与该第一表面相对的第二表面。该第一表面形成有多个微凸起，每个微凸起包括至少三个相互连接的侧面，每个侧面的水平宽度沿远离第一表面的方向逐渐缩小。该第二表面形成多个球面凹槽。该第一表面和第二表面之至少一表面开设有光源容纳部。
一种背光模组，其包括框架、扩散板、光学板及至少一个侧光式点光源；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侧光式点光源设于该底板表面；该扩散板封盖该腔体；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，该光学板单元包括第一表面及与该第一表面相对的第二表面，该第一表面形成有多个微凸起，每个微凸起包括至少三个相互连接的侧面，每个侧面的水平宽度沿远离第一表面的方向逐渐缩小；该第二表面形成多个球面凹槽；该第一表面和第二表面之至少一表面开设有光源容纳部；该侧光式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的光学板单元包括光源容纳部与第一表面上的多个微凸起以及第二表面形成多个球面凹槽，侧光式点光源的出光部容纳在光源容纳部，从侧光式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。由于微凸起具有变化的表面结构，使得光线在光学板内传输至微凸起时，部分原来在未设有微凸起的光学板内全反射传播的光线可被微凸起调节后朝向扩散板方向折射出射，从而增加出射光线。进一步地，由于光学板的第二面设置有球面凹槽，部分原来在未设有球面凹槽的光学板内全反射传播的光线可被其调节后从第二表面出射，在反射板的辅助作用下，此部分光线多次折射后朝向扩散板出射。因此背光模组的光学利用率也将进一步提高。更进一步地，由于采用侧光式点光源，在光学板的作用下，侧光式点光源被转变成面光源。采用该光学板的背光模组具有厚度小的优点。
附图说明
图1是一种现有的背光模组的剖示图。
图2是本发明较佳实施例一的背光模组的剖示图。
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IV-IV线的剖示图。
图5是图3所示光学板的另一视角的立体图。
图6是本发明较佳实施例二的光学板的剖示图。
图7是本发明较佳实施例三的光学板的剖示图。
图8是本发明较佳实施例四的组合光学板的立体分解图。
图9是本发明较佳实施例五的光学板的仰视图。
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、一个扩散板23、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。扩散板23设置于多个侧壁213顶部，用于封盖腔体217。腔体217用于收容光学板20、反射板22及侧光式点光源25等元件。光学板20设置在腔体217内，其出光面202面向扩散板23。光学板20底面203的下方设置有反射板22。反射板22开设一个对应于侧光式点光源25的通孔(未标示)，侧光式点光源25的出光部251穿过该通孔(未标示)。侧光式点光源25固定于底板211。侧光式点光源25优选为侧光式发光二极管，且其出光部251容纳于光学板20的光源容纳部204内。本实施例中侧光式点光源25还包括一设于顶部的反射元件253，该反射元件253可将从侧光式点光源25的出光部251顶部发射出的部分光线反射至光学板20内。从侧光式点光源25发出的光线于腔体217内充分混合后可经过扩散板23出射。
请同时参见图3至图5，光学板20为矩形透明板，其底面203中心开设有光源容纳部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形成有位于光源容纳部204周围的多个微凸起205。底面203形成有位于光源容纳部204周围的多个球面凹槽206。
本实施例中，该多个微凸起205呈规则的阵列式排布，每个微凸起205为正四面锥形凸起，其中两相对侧面的夹角θ1的较佳取值范围为60至120度。如图3所示，多个微凸起205沿与X轴方向或Y轴相平行或垂直的方向延伸排列，相邻微凸起205之间的间距优选为0.025毫米至2毫米。此外，多个微凸起205还可沿X轴与Y轴之间的任意夹角方向排列，此种排列可进一步控制出射光的出射角度。可以理解，微凸起205的形状并不限于正四面锥形凸起，其也可为其他多面锥形凸起或锥台凸起。
如图5所示，本实施例中，该多个球面凹槽206呈矩形阵列，每个凹槽206为半球面凹槽，相邻球面凹槽206的间距也优选为0.025毫米至2毫米。每个球面凹槽206的半径及深度的较佳取值范围为0.01毫米至2毫米。
请再参阅图2，在实施例一的背光模组200中，侧光式点光源25的出光部251发射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。由于微凸起205具有变化的表面结构，使得光线在光学板20内传输至凸起205时，部分原来在未设有微凸起205的光学板20内全反射传播的光线可被微凸起205调节后沿特定的方向折射出射，例如将部分光线调节至垂直于扩散板23方向的正面方向出射，从而增加正面出射的光线，避免在相邻的侧光式点光源25之间的上方产生暗区，提高背光模组200的出光均匀性。进一步地，由于光学板20的底面设置有球面凹槽206，部分原来在未设有球面凹槽206的光学板20内全反射传播的光线可被其调节后从底面203出射，在反射板22的辅助作用下，此部分光线多次折射后朝向扩散板23出射。因此背光模组200的光学利用率也将进一步提高。更进一步地，由于采用侧光式点光源25，侧光式点光源25所发射的光线大部分于光学板20内向周围传播，因此点光源被转变成面光源。侧光式点光源25正上方的区域将避免出现亮点，此设计为缩小扩散板23与光学板20之间的距离成为可能，从而，减小背光模组200的厚度。
可以理解的是：为使得该背光模组200在特定的视角范围内具有较高的亮度，在扩散板23的上方还可设置一棱镜片24；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可进一步包括多个贴于框架21侧壁213的反射侧壁223。
另外，尤其当框架21为高反射材料制成或于底面涂覆反射涂层时，本实施例的反射板22可省略。
请参见图6，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的光源容纳部304为从底面303向光学板30内部凹陷的盲孔。
请参见图7，所示为本发明较佳实施例三的光学板40。该光学板40与较佳实施例二的光学板30相似，其不同在于光学板40的微凸起405的顶角以及相邻微凸起405形成的底部夹角均被圆角化，分别形成圆角R1和R2。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。被圆角化的微凸起405可使出射光束的出射角度的变化趋于缓和，使采用光学板40的背光模组的出光均匀性提高。
请参见图8，所示为本发明较佳实施例四的组合光学板50。该组合光学板50包括多个光学板单元52。光学板单元52与较佳实施例一的光学板20的结构相同。多个光学板单元52相互紧密排列，形成一个较大的组合光学板50。
可以理解，上述本发明光学板单元的形状可为多边形或圆形。光学板单元上的微凸起及球面凹槽的排布方式包括阵列排布、阵列间隔排布、随机排布或相对于光学板单元的中心对称分布等，其中中心对称排布有利于光线在各个方向上均匀分散。
上述本发明光学板单元的球面凹槽还可通过改变其大小及密度以调整光学板的出光面的光源均匀性。对于相同大小的多个球面凹槽，可设置成等密度的排列；对于不同大小的多个球面凹槽，距离光学板单元的中心较近处可设置较小的且密度较高的球面凹槽，而距离光学板单元的中心较远处可设置较大的且密度较低的球面凹槽。
请参见图9，所示为本发明较佳实施例五的光学板60，其与实施例二相似，不同在于光学板60的底面603上的多个球面凹槽606为以光学板60的中心为圆心，沿着圆环形轨道对称分布，越远离该光学板60的中心，球面凹槽606的直径越大。
此外，本发明光学板的微凸起和球面凹槽可互换设置于出光面或底面，也就是说，在背光模组中，光源容纳部为通孔的上述光学板的出光面及底面均可朝向扩散板设置。综上所述，假设将本发明光学板的出光面或底面之一定义为第一表面，与该其相对的底面或出光面定义为第二表面，那么，第一表面形成有多个微凸起，第二表面形成有多个球面凹槽。
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，该光学板单元包括第一表面及与该第一表面相对的第二表面，其特征在于：该第一表面形成有多个微凸起，每个微凸起包括至少三个相互连接的侧面，每个侧面的水平宽度沿远离该第一表面的方向逐渐缩小；该第二表面形成多个球面凹槽；该第一表面和第二表面之至少一表面开设有光源容纳部
2.如权利要求1所述的光学板，其特征在于：该微凸起为锥形凸起或锥台凸起。
3.如权利要求2所述的光学板，其特征在于：每个锥形凸起的两相对侧面的夹角为60至120度，相邻微凸起的间距为0.025毫米至2毫米。
4.如权利要求1所述的光学板，其特征在于：该多个微凸起呈阵列排布、阵列间隔排布或以光源容纳部的为中心呈中心对称排布。
5.如权利要求1所述的光学板，其特征在于：该球面凹槽的半径及深度为0.01毫米至2毫米，相邻球面凹槽的间距为0.025毫米至2毫米。
6.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。
7.如权利要求1所述的光学板，其特征在于：该光学板包括多个光学板单元，该多个光学板单元紧密排布。
8.如权利要求1所述的光学板，其特征在于：该光学板在微凸起的顶角及底部夹角的至少一处进行圆角化处理，圆角半径大于0毫米，且小于或等于1.1毫米。
9.一种背光模组，其包括框架、扩散板、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；该至少一个侧光式点光源固定于该底板；该扩散板封盖该腔体；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，该光学板单元包括第一表面及与该第一表面相对的第二表面，其特征在于：该第一表面形成有多个微凸起，每个微凸起包括至少三个相互连接的侧面，每个侧面的水平宽度沿远离第一表面的方向逐渐缩小；该第二表面形成多个球面凹槽，且该第一表面和第二表面中之至少一表面开设有光源容纳部；该侧光式点光源的发光部相应设置于该光源容纳部内。
10.如权利要求9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，该侧光式点光源相应穿过该通孔。
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