CN101290372A - 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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CN101290372A
CN101290372A CNA2007102004789A CN200710200478A CN101290372A CN 101290372 A CN101290372 A CN 101290372A CN A2007102004789 A CNA2007102004789 A CN A2007102004789A CN 200710200478 A CN200710200478 A CN 200710200478A CN 101290372 A CN101290372 A CN 101290372A
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optical sheet
optical
plate
exiting surface
light source
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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 US11/835,428 priority patent/US20080259639A1/en
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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
    • G02B6/0013Means 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
    • G02B6/0033Means 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
    • G02F1/133602Direct backlight
    • G02F1/133606Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02B6/003Lens or lenticular sheet or layer
    • 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
    • G02F1/133611Direct backlight including means for improving the brightness uniformity

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

本发明涉及一种背光模组及其光学板。该光学板包括至少一个光学板单元,该光学板单元包括一个出光面及一个与该出光面相对的底面,该底面开设有光源容纳部,该出光面开设有多个凹槽。采用该光学板的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。
请一并参见图1与图2,所示为一种现有的背光模组100,其包括一框架101、一反射板102、一扩散板103、一棱镜片104及至少一发光二极管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(图未标)。发光二极管105设置于底板1011,其包括一个发光部1051。扩散板103与棱镜片104依次设置于多个侧壁1013顶部。扩散板103可使从发光二极管105出射的光线发生扩散,以提高背光模组100的出光均匀性。棱镜片104可提高背光模组100在特定视角范围内的出光亮度。反射板102为一个小框体结构,其可配置于框架101内部。该反射板102的底部开设有与发光二极管105相对应的通孔(图未标),且发光二极管105的发光部1051穿过相应通孔向扩散板103发射光束。
工作时,发光二极管105产生的光线进入扩散板103被均匀扩散后,其继续进入棱镜片104,在棱镜片104的作用下使出射光线发生一定程度的聚集作用,以提高背光模组在特定视角范围内的亮度。
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正上方形成亮区,而在发光极管105周围的扩散板103区域形成暗区,影响背光模组100的出光均匀性。为此,通常在发光二极管105上或在扩散板103与发光二极管105对应的区域设置反射片107,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107的搭配设计,可一定程度上消除发光二极管105正上方的亮区,但是背光模组100仍然存在出光不均的不足。
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,该光学板单元包括一个出光面及一个与该出光面相对的底面,该底面开设有光源容纳部,该出光面开设有多个凹槽。
一种背光模组,其包括一框架、一扩散板、至少一点光源及一光学板,框架包括一底板及多个从该底板边缘向远离底板的方向延伸的侧壁,多个侧壁顺次连接并与底板形成一腔体,扩散板设置于多个侧壁顶部,该光学板包括至少一个光学板单元,该光学板单元包括一个出光面及一个与该出光面相对的底面,光学板设置于底板与扩散板之间且其光学板单元之出光面面向扩散板,该底面开设有光源容纳部,该出光面开设有多个凹槽。
与现有技术相比较,所述背光模组的光学板的光学板单元包括开设于该底面的光源容纳部及开设于出光面的多个凹槽。点光源的发光部可容置于光源容纳部处,该光源容纳部可使得点光源所发出的光线射入光学板内。光线于光学板内传输时,部分光线可被凹槽调节沿特定方向从出光面出射,从而增加相应区域正面出射的出光量,从而易于避免在点光源之间或者四周的上方产生暗区,提高背光模组的出光均匀性。因此,采用该光学板的背光模组具有出光均匀的优点。
附图说明
图1是现有技术的背光模组的结构示意图。
图2是图1局部II所示的放大图。
图3是本发明较佳实施例一的光学板的结构示意图。
图4是图3所示光学板沿IV-IV线的剖面示意图。
图5是本发明较佳实施例二的背光模组的剖面示意图。
图6是图5局部VI所示的放大图。
图7是本发明较佳实施例三的光学板的结构示意图。
图8是图7所示光学板沿VIII-VIII线的剖面示意图。
图9是本发明较佳实施例四的光学板的剖面示意图。
图10是本发明较佳实施例五的光学板的剖面示意图。
图11是本发明较佳实施例六的光学板结构示意图。
图12是本发明较佳实施例七的光学板结构示意图。
具体实施方式
下面将结合附图和多个实施例对本发明的光学板作进一步的详细说明。
请一并参阅图3和图4,本发明较佳实施例一提供一种光学板20。该光学板20呈四方形,其包括多个光学板单元21,该多个光学板单元21为阵列紧密排布。每一光学板单元21包括一个出光面212及一个与该出光面212相对的底面213。该底面213为平面,且每个底面213中央开设有一个光源容纳部214。本实施例中,该光源容纳部214为从底面213贯穿至出光面212的通孔。出光面212形成有凹槽215。本实施例中,该凹槽215为球面凹槽,每个光学板单元21的多个凹槽215矩阵排布,且光源容纳部214位于矩形中心。
为达到较好的光学效果,凹槽215的球面半径优选0.01毫米至2毫米,每一凹槽215的深度优选0.01毫米至2毫米。光学板20的厚度优选0.5毫米至5毫米。
请一并参阅图5与图6,本发明较佳实施例二提供一背光模组200。该背光模组200包括一框架201、一扩散板203、多个点光源205以及本发明较佳实施例一提供的光学板20。框架201包括一底板2011及四个从该底板2011边缘向其一侧垂直延伸的侧壁2013,四个侧壁2013相互连接并与底板2011形成一腔体(图未标),用于收容点光源205与光学板20。扩散板203设置于多个侧壁2013顶部。光学板20设置于底板2011与扩散板203之间且其光学板单元21之出光面212面向扩散板203。多个点光源205分别设置于底板2011且其发光部2051分别位于光学板20的光源容纳部214内。该点光源205优选发光二极管。
由于点光源205的发光部2051可设置于光源容纳部214处,点光源205所发出的光线通过光源容纳部214的侧壁射入光学板20内。光线于光学板20内传输过程中,由于光线射至凹槽215表面各点的入射角度不同,使光线到达凹槽215时,部分光线可被其调节沿特定方向从出光面212出射,例如将部分光线折射至靠近垂直扩散板203的正面方向出射,从而增加相应区域正面出射的出光量,避免在相邻的点光源205之间或点光源205周围的上方产生暗区,提高背光模组200的出光均匀性。因此,采用该光学板20的背光模组200具有出光均匀的优点。
另外,由于采用光学板20的背光模组200可避免暗区形成,所以,扩散板203与光学板20之间可设置较小的间距甚至可直接接触。因此,采用该光学板20的背光模组200具有厚度相对较薄的优点。
可以理解,为提高光的利用率,还可于光学板20的光学板单元21的底面213一侧设置一反射板202,该反射板202可将透过底面213出射的光线反射回光学板20。该点光源205的发光部2051上方可设置反射片207。该反射片207可使得点光源205直接正面出射至扩散板203的光线被反射片207减弱,因此可避免在点光源205的正上方的出现亮点,进一步提高背光模组200的出光均匀性。
可以理解,为使得该背光模组200在特定的视觉范围内具有较高的亮度,还可于扩散板203上设置一棱镜片204。
请一并参阅图7与图8,本发明较佳实施例三提供一种光学板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为一个光学板单元。该光学板单元包括一个出光面312、一个与出光面312相对的底面313及一个开设于底面313的光源容纳部314。出光面312形成有多个凹槽315,该多个凹槽315于出光面312呈阵列排布。该底面313为平面。光源容纳部314为从底面313贯穿至出光面312的通孔,且该光源容纳部314开设于底面313的中心区域。
请参阅图9,本发明较佳实施例四提供一种光学板50。该光学板50与较佳实施例三的光学板30相似,其不同在于:开设于光学板50的底面513的光源容纳部514为盲孔。
请参阅图10,本发明较佳实施例五提供一种光学板70。该光学板70与较佳实施例三的光学板30相似,其不同在于:光学板70的底面713形成有多个凹槽716。
可以理解,凹槽可为棱台形凹槽、圆台形凹槽等其他凹槽结构;并且,多个凹槽的形状与大小可以相同,也可不同。
请参阅图11,本发明较佳实施例六提供一种光学板80。该光学板80与较佳实施例三的光学板30相似,其不同在于:光学板80的出光面812上的多个凹槽815为随机排布。
可以理解,多个凹槽可于相应的出光面或底面以光源容纳部为中心对称排布,甚至还可为紧密排布或间隔排布等。
请参阅图12,本发明较佳实施例七提供一种光学板90。该光学板90与较佳实施例三的光学板30相似,其不同在于:光学板90为一个正八边形。
可以理解,本发明的光学板也可以是三角形、五边形、六边形或者其他形状,甚至还可为楔形。此外,为提高上述背光模组的亮度或用不同颜色的发光二极管混光形成白光,上述光学板或光学板单元的光源容纳部可为多个,以使光学板或光学板单元可对应容纳多个光源。

Claims (10)

1.一种光学板,其包括至少一个光学板单元,该光学板单元包括一个出光面及一个与该出光面相对的底面,其特征在于:该底面开设有光源容纳部,该出光面开设有多个凹槽。
2.如权利要求1所述的光学板,其特征在于:该凹槽为球面凹槽。
3.如权利要求2所述的光学板,其特征在于:该凹槽的球面半径为0.01毫米至2毫米,该凹槽的深度为0.01毫米至2毫米。
4.如权利要求1所述的光学板,其特征在于:该多个凹槽呈阵列排布。
5.如权利要求1所述的光学板,其特征在于:该多个凹槽以光源容纳部为中心对称排布。
6.如权利要求1所述的光学板,其特征在于:该光源容纳部为盲孔与通孔之一。
7.如权利要求1所述的光学板,其特征在于:该底面形成有多个凹槽。
8.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,且该多个光学板单元为阵列排布并紧密相连。
9.一种背光模组,其包括一框架、一扩散板、至少一点光源及一光学板,框架包括一底板及多个从该底板边缘向远离底板的方向延伸的侧壁,多个侧壁顺次连接并与底板形成一腔体,扩散板设置于多个侧壁顶部,该光学板包括至少一个光学板单元,该光学板单元包括一个出光面及一个与该出光面相对的底面,光学板设置于底板与扩散板之间且其光学板单元之出光面面向扩散板,其特征在于:该底面开设有光源容纳部,该出光面开设有多个凹槽,点光源设置于底板且其发光部位于光学板的光源容纳部内。
10.如权利要求9所述的背光模组,其特征在于:该点光源的发光部上方设置有反射片,该光学板单元的底面一侧设置有反射板。
CNA2007102004789A 2007-04-18 2007-04-18 背光模组及其光学板 Pending CN101290372A (zh)

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