CN102767762B - 背光模组 - Google Patents

背光模组 Download PDF

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CN102767762B
CN102767762B CN201210264173.5A CN201210264173A CN102767762B CN 102767762 B CN102767762 B CN 102767762B CN 201210264173 A CN201210264173 A CN 201210264173A CN 102767762 B CN102767762 B CN 102767762B
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barricade
lgp
backlight module
backlight
light
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CN102767762A (zh
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黄建发
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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 US13/698,024 priority patent/US9494722B2/en
Priority to PCT/CN2012/079907 priority patent/WO2014015541A1/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
    • G02F1/133608Direct backlight including particular frames or supporting means
    • 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
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055Reflecting element, 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
    • G02F1/133605Direct backlight including specially adapted reflectors
    • 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
    • G02B6/0081Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086Positioning aspects
    • G02B6/0091Positioning aspects of the light source relative to 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
    • G02F2202/00Materials and properties
    • G02F2202/28Adhesive materials or arrangements

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

Abstract

本发明提供一种背光模组,包括:背板、设于背板内的背光源、设于背板内且相对背光源设置的导光板、设于导光板与背板之间的反射片、设于导光板上的光学膜片组、设于背板上的胶框、及设于导光板与胶框之间且相对背光源设置的挡墙,所述梯形挡墙靠近背光源侧具有一斜面,所述斜面上设有一反射层。通过在胶框与导光板之间相对背光源的位置设置一带有反射层的挡墙,将入射到挡墙的光线反射进导光板中,避免从光学膜片组和导光板之间的缝隙中折射出去,形成亮线,很好地解决侧入式背光模组中入光侧的亮线问题,具有较高的耦光效率的同时又提高导光板的亮度,避免了LED光源发出的光的亮度损失,提高LED光源利用率。

Description

背光模组
技术领域
本发明涉及液晶显示领域,尤其涉及一种提高导光板亮度的背光模组。
背景技术
液晶显示装置(LCD,Liquid Crystal Display)具有机身薄、省电、无辐射等众多优点,得到了广泛的应用。现有市场上的液晶显示装置大部分为背光型液晶显示装置,其包括液晶面板及背光模组(backlight module)。液晶面板的工作原理是在两片平行的玻璃基板当中放置液晶分子,两片玻璃基板中间有许多垂直和水平的细小电线,通过通电与否来控制液晶分子改变方向,将背光模组的光线折射出来产生画面。由于液晶面板本身不发光,需要借由背光模组提供的光源来正常显示影像,因此,背光模组成为液晶显示装置的关键组件之一。背光模组依照光源入射位置的不同分成侧入式背光模组与直下式背光模组两种。直下式背光模组是将发光光源例如CCFL(Cold CathodeFluorescent Lamp,阴极萤光灯管)或LED(Light Emitting Diode发光二极管)设置在液晶面板后方,直接形成面光源提供给液晶面板。而侧入式背光模组是将背光源LED灯条(Light bar)设于液晶面板侧后方的背板边缘,LED灯条发出的光线从导光板(LGP,Light Guide Plate)一侧的入光面进入导光板,经反射和扩散后从导光板出光面射出,在经由光学膜片组,以形成面光源提供给液晶面板。
请参阅图1,侧入式背光模组中的胶框与导光板/光学膜片之间存在一定的空隙。在正常使用的情况中,胶框会由于受热或其它原因变形,或者空隙较大时,从LED光源入射到胶框上的光会在该缝隙处出射到外面,形成亮线,会导致LED光源发出的光造成3%左右的亮度损失。请参阅图2,这是因为LED光源200发出的光会有一部分入射到胶框600上造成的,针对该原因,现有的技术方案是在胶框600相对LED光源200、导光板300及光学膜片500的位置上设置反射层700,将入射胶框600的光反射回去,但仍会有部分光线反射到导光板300与胶框600之间的缝隙中,从而逸出成为亮线,造成LED光源200发出的光的亮度损失。随着LED灯条作为背光源的发展,窄边框(小于8.0mm)背光模组也成为未来发展的趋势,但该现象在窄边框的背光模组中变得尤为明显,是一个急需解决的问题。
发明内容
本发明的目的在于提供一种背光模组,很好地解决侧入式背光模组中入光侧的亮线问题,并提高导光板的亮度,避免了LED光源发出的光的亮度损失,提高LED光源利用率。
为实现上述目的,本发明提供一种背光模组,包括:背板、设于背板内的背光源、设于背板内且相对背光源设置的导光板、设于导光板与背板之间的反射片、设于导光板上的光学膜片组、设于背板上的胶框、及设于导光板与胶框之间且相对背光源设置的挡墙,所述挡墙靠近背光源侧具有一斜面,所述斜面上设有一反射层。
所述导光板具有一出光面,所述挡墙斜面与导光板的出光面成5-20°的角度。
所述挡墙为一梯形挡墙。
所述挡墙为一直角梯形挡墙。
所述挡墙靠近导光板一侧具有一底面,所述挡墙通过粘贴或螺丝锁紧固定于胶框上,所述底面与导光板的距离为0.2mm,组装后,所述挡墙固定压紧导光板。
所述挡墙采用与胶框相同的材质制作而成。
所述挡墙与胶框一体成型。
所述反射层为一粘贴于挡墙斜面上的反射片或涂覆于挡墙斜面上的反射性材料。
所述反射层为镜面反射或者白色漫反射。
所述胶框的颜色为黑色或深色。
本发明的有益效果:本发明背光模组通过在胶框与导光板之间相对背光源的位置设置一带有反射层的挡墙,将入射到挡墙的光线反射进导光板中,避免从光学膜片组和导光板之间的缝隙中折射出去,形成亮线,很好地解决侧入式背光模组中入光侧的亮线问题,具有较高的耦光效率的同时又提高导光板的亮度,避免了LED光源发出的光的亮度损失,提高LED光源利用率。
为了能更进一步了解本发明的特征以及技术内容,请参阅以下有关本发明的详细说明与附图,然而附图仅提供参考与说明用,并非用来对本发明加以限制。
附图说明
下面结合附图,通过对本发明的具体实施方式详细描述,将使本发明的技术方案及其它有益效果显而易见。
附图中,
图1为现有显示屏的亮线示意图;
图2为现有胶框具有反射层的背光模组的结构示意图;
图3为本发明背光模组一实施例的结构示意图;
图4为本发明背光模组另一实施例的结构示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果,以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图3,本发明提供一种背光模组,包括:背板1、设于背板1内的背光源2、设于背板1内且相对背光源2设置的导光板3、设于导光板3与背板1之间的反射片4、设于导光板3上的光学膜片组5、设于背板1上的胶框6、及设于导光板3与胶框6之间且相对背光源2设置的挡墙7,所述挡墙7靠近背光源2侧具有一斜面72,所述斜面72上设有一反射层8。通过挡墙7上的反射层8将背光源2发出、入射到该挡墙7的光线反射回导光板3,避免从光学膜片组5和导光板3之间的缝隙中折射出去,很好地解决了现有背光模组中的亮线问题,具有较高的耦光效率的同时又提高了导光板3的亮度(约2%-3%),提高能源利用率。
所述导光板3具有一出光面(未标示),所述挡墙7斜面72与导光板3的出光面成5-20°的角度。在本较佳实施例中,所述挡墙7为一梯形挡墙,优选为一直角梯形挡墙。
所述挡墙7与胶框6分体设计,并通过粘贴或螺丝锁紧固定于胶框6上,所述挡墙7采用与胶框6相同的材质制作而成。所述挡墙7靠近导光板3一侧具有一底面,其中作为加工以及组装公差,所述底面与导光板3的距离为0.2mm,组装后,挡墙7与导光板3接触,起到固定压紧导光板3的作用。
所述反射层8为一粘贴于挡墙7斜面72上的反射片。然不限于此,所述反射层8也可以为涂覆于挡墙7斜面72上的反射性材料。所述反射层8可以采用镜面反射的反射片或者通过反射材料制成镜面反射层,耦光效率更佳,亦可以采用白色漫反射的反射片或者通过反射材料制成白色漫反射层,可以进一步降低生产成本。
为了获得较佳的光学效果,所述胶框6的颜色优选为黑色或深色。
请参阅图4,作为可供选择的一较佳实施例,所述挡墙7’与胶框6’一体成型,所述胶框6’上对应背光源2及导光板3的地方长出一梯形挡墙7’,所述梯形挡墙7’的斜面72’上设有一反射层8,将背光源2发出、入射到该挡墙7’的光线反射回导光板3,避免从光学膜片组5和导光板3之间的缝隙中折射出去,很好地解决了现有背光模组中亮线的问题,具有较高的耦光效率的同时又提高了导光板3的亮度(约2%-3%),提高能源利用率。
综上所述,本发明提供一种背光模组,通过在胶框与导光板之间相对背光源的位置设置一带有反射层的挡墙,将入射到挡墙的光线反射进导光板中,避免从光学膜片组和导光板之间的缝隙中折射出去,形成亮线,很好地解决侧入式背光模组中入光侧的亮线问题,具有较高的耦光效率的同时又提高导光板的亮度,避免了LED光源发出的光的亮度损失,提高LED光源利用率。
以上所述,对于本领域的普通技术人员来说,可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形,而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (7)

1.一种背光模组,其特征在于,包括:背板、设于背板内的背光源、设于背板内且相对背光源设置的导光板、设于导光板与背板之间的反射片、设于导光板上的光学膜片组、设于背板上的胶框、及设于导光板与胶框之间且相对背光源设置的挡墙,所述挡墙靠近背光源侧具有一斜面,所述斜面上设有一反射层;
所述导光板具有一出光面,所述挡墙斜面与导光板的出光面成5-20°的角度;
所述挡墙为一梯形挡墙;
所述挡墙靠近导光板一侧具有一底面,所述挡墙通过粘贴或螺丝锁紧固定于胶框上,所述底面与导光板的距离为0.2mm,组装后,所述挡墙固定压紧导光板。
2.如权利要求1所述的背光模组,其特征在于,所述挡墙为一直角梯形挡墙。
3.如权利要求1所述的背光模组,其特征在于,所述挡墙采用与胶框相同的材质制作而成。
4.如权利要求3所述的背光模组,其特征在于,所述挡墙与胶框一体成型。
5.如权利要求1所述的背光模组,其特征在于,所述反射层为一粘贴于挡墙斜面上的反射片或涂覆于挡墙斜面上的反射性材料。
6.如权利要求5所述的背光模组,其特征在于,所述反射层为镜面反射或者白色漫反射。
7.如权利要求1所述的背光模组,其特征在于,所述胶框的颜色为深色。
CN201210264173.5A 2012-07-27 2012-07-27 背光模组 Expired - Fee Related CN102767762B (zh)

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CN201210264173.5A CN102767762B (zh) 2012-07-27 2012-07-27 背光模组
US13/698,024 US9494722B2 (en) 2012-07-27 2012-08-10 Backlight module
PCT/CN2012/079907 WO2014015541A1 (zh) 2012-07-27 2012-08-10 背光模组

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