CN104654132A - 一种限制液晶屏视角的背光模块 - Google Patents

一种限制液晶屏视角的背光模块 Download PDF

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CN104654132A
CN104654132A CN201510063586.0A CN201510063586A CN104654132A CN 104654132 A CN104654132 A CN 104654132A CN 201510063586 A CN201510063586 A CN 201510063586A CN 104654132 A CN104654132 A CN 104654132A
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light guide
guide plate
liquid crystal
parallel
triangular prism
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CN104654132B (zh
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邢晓雨
杨宏运
朱向冰
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Changzhou Tianlu Display Technology Co Ltd
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Anhui Normal University
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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
    • G02F1/133606Direct 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
    • G02B6/0033Means 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
    • 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

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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)
  • Liquid Crystal (AREA)

Abstract

本发明属于液晶显示技术领域,公开了一种限制液晶屏视角的背光模块,使用角度控制导光板模块和LED光源模块,两块导光板分别贴有周期性排列的三棱柱阵列以及椭圆透镜阵列,椭圆的长轴相互平行,三棱柱的底角不对称;本发明的有益效果是能够精确的限制液晶屏的出光角度,适用于对液晶屏的观察视角有特殊要求的场合。

Description

一种限制液晶屏视角的背光模块
技术领域
本发明涉及液晶显示技术领域,尤其是一种能限制液晶屏视角的背光模块。
背景技术
目前国内外已经对液晶显示技术研究有一定进展,二十世纪九十年代,随着笔记本电脑的普及,液晶显示技术开始飞速发展。
但是现在的液晶显示技术领域仍做不到控制液晶屏的出光角度,现有的液晶显示器的出光角度都非常大。在一些特殊的应用场合中,如在飞机的驾驶舱中,液晶屏将置于狭窄的驾驶舱中,液晶屏的出光角度不能太大,如果出光角度太大,则不仅耗能,并且照到附近仪表上的反射光会干扰到飞行员的视线,特别是夜间驾驶时,会带来一定操作难度和潜在危险,因此控制液晶屏的发光角度十分必要。液晶屏的出光角度主要是由背光模块的出光角度决定的,因此限制背光模块的出光角度是非常重要的。
发明内容
为了解决上述问题,本发明公开了一种限制液晶屏视角的背光模块,本发明解决上述问题采用的技术方案是:使用角度控制导光板模块和LED光源模块,设定导光板靠近液晶层的一侧为外表面,与之相对的一侧为内表面,角度控制导光板模块包括导光板一和导光板二;所述的导光板一的外表面贴有三棱柱阵列;所述的导光板二的内表面贴有增光片,外表面嵌有透镜阵列;所述的三棱柱阵列采用的是周期性排列的三棱柱的微小单元,三棱柱长棱相互平行且平行于导光板边界,三棱柱的主截面三角形的底角是不对称的;所述的增光片采用BEF系列的增光片;所述的透镜阵列采用的是周期性排列的微小椭圆透镜单元,椭圆的长轴为0.2mm,短轴为0.1mm,长轴相互平行且间距为0.2mm,短轴相互平行且间距为0.2mm,长轴与短轴分别平行于导光板边界;所述的LED光源模块包括:铝基电路板、扩散板、下扩散片,所述的铝基电路板的表面均匀铺设LED。
本发明的有益效果是:不仅能够精确地限制背光模块的出光角度,还能节省能源,能减少照射到周围仪表上的反射光,防止光线对飞行员视线的干扰,提高安全性,并且价格低廉。
附图说明
图1是实施例中背光源亮度测试示意图。
图2是传统棱镜片模型图。
图3是实施例中三棱柱阵列的微结构示意图。
图4是利用tracepro软件对液晶屏建模。
图5是传统棱镜片与三棱柱阵列组合的出光效果。
图6是实施例中椭圆透镜阵列的示意图。
图7是一个实施例的结构示意图。
图8是实施例的出光效果图。
图中:1.背光源,2.亮度计,3.光学塑料制成的三棱柱,4.PET基层,5.铝基电路板,6.LED,7.扩散板,8.下扩散片,9.导光板一,10.导光板二,11.液晶屏,12.导光板一和导光板二的局部放大图,13.椭圆透镜单元。
具体实施方式
下面将结合附图对本发明的实施例做进一步的详细说明。
一种限制液晶屏视角的背光模块,使用角度控制导光板模块和LED光源模块,规定导光板靠近液晶层的一侧为外表面,与之相对应的一侧为内表面,角度控制导光板模块包括导光板一和导光板二,导光板一的外表面贴有三棱柱阵列,导光板二的内表面贴有增光片,外表面嵌有透镜阵列;三棱柱阵列采用的是周期性排列的三棱柱的微小单元,长棱相互平行且平行于导光板边界,三棱柱的主截面三角形的角度与传统增光片不同,其底角是不对称的,增光片采用BEF系列的增光片,透镜阵列采用的是周期性排列的微小椭圆透镜单元,椭圆的长轴为0.2mm,短轴为0.1mm,长轴相互平行且间距为0.2mm,短轴相互平行且间距为0.2mm,长轴与短轴分别平行于导光板边界;LED光源模块包括:铝基电路板、扩散板、下扩散片,铝基电路板的表面均匀铺设LED。
图1是实施例中背光源亮度测试示意图,(a)为直观图,(b)为亮度测试俯视图,(c)为亮度测试侧视图。规定背光源的正中心为O点,正前方S0为额定测试位置,S1、S0、S2在同一水平面上,S3、S0、S4在同一铅垂面上。S0与O点的连线为S0O,S1与O点的连线为S1O,S2与O点的连线为S2O,S3与O点的连线为S3O,S4与O点的连线为S4O。S1O与S0O夹角为45度,S0O与S2O夹角为45度,S3O与S0O夹角为30度,S0O与S4O夹角为45度。本实施例最终目的是将直下式液晶显示屏的背光角度限制为:在S0点测试O点的亮度L达到680cd/m2,从S1、S2、S3及S4点测试到的O点亮度下降到三分之一L以下,并且当观测角度更大的时候,亮度进一步下降,光线主要集中在S1、S2、S3、S4和O点围成的锥形中,而锥形以外的光线要很弱。
采用三棱柱阵列与增光片组合,传统的增光片是利用3M微复制技术,如图2,将丙烯酸树脂制成的棱镜结构制作在PET基材上制造而成的光学薄膜,其表面是高度为20~50微米左右的微棱镜结构。按照几何光学原理,背光源出射的光线经过增光片及背光源系统的循环作用,最终汇聚在正视方向出射,从而达到增亮效果。由于目前国内市场上的增光片的出光角度是70°对称的,并不能满足要求。
本实施例的三棱柱阵列结构如图3,图中,(d)(e)(f)为一个三棱柱微结构单元的三视图,(g)为三棱柱阵列的示意图,是由一系列三棱柱密集排列而成,其微三棱柱单元的主截面三角形两个底角为y0和y1,y0和y1分别为100°和45°分别起着控制该侧出光角度的作用,x0和x1定为80°,棱柱高度为0.05mm。
采用tracepro光学设计软件对目标对象进行建模,如图4。
本实施例使用的是7寸(83mm×47mm)的直下式液晶屏,其LED光源模块包括以下几个结构:铝基电路板,299颗LED,采用的是cree公司的型号为cree®Xlamp®XQ-B的LED,以及扩散板,下扩散片。角度控制导光板模块包括:导光板一的外表面贴有三棱柱阵列,导光板二的内表面贴有增光片,外表面嵌有透镜阵列。
对使用传统棱镜片与三棱柱阵列组合的模型进行光路追迹,得到的结果如图5,两条曲线分别表示从竖直平面和水平面内观测O点得到的亮度分布,液晶屏前方的光线出现不对称现象,在水平面内光线主要集中在±45度以内,在竖直平面内主要集中在+30到-60度以内。
但是图5中亮度曲线波动很大,在指定的范围内出光不均匀,而且在指定的角度以外仍有很多光线,为解决该问题,再增加透镜阵列可以改善出光的均匀性。采用椭圆的正透镜阵列对凌乱的出射光线进行准直,在导光板的外表面添加椭圆透镜,椭圆的长轴为0.2mm,短轴为0.1mm,长轴相互平行且间距为0.2mm,短轴相互平行且间距为0.2mm,长轴与短轴分别平行于导光板边界,微观结构如图6所示,其嵌入导光板的深度为0.05mm,此深度出光均匀性最好。此时的光强分布如图8,不仅指定角度以外的光线明显减少,而且在指定角度以内亮度的均匀性得到明显的改善。在S1、S2、S3、S4各点都达到了预期的效果,因此最终确定的液晶屏的结构如图7。
本发明由于导光板横向和纵向的对称性,因此也可适用于其他尺寸的液晶屏,对于其他出光角度的要求,只需修三棱柱阵列的微三棱柱单元的主截面三角形的y1和y0的大小,以及通过修改椭圆透镜的嵌入深度来准直光线来达到目的,因此,本方案具有很好的移植性和实用性。
上述实例仅例示性说明本发明的原理及其功效,对于本领域的普通技术人员来说,在不脱离本发明的创新构思的前提下,还可以作出的若干的变形和改进,这些都属于本申请的保护范围之内。

Claims (1)

1.一种限制液晶屏视角的背光模块,使用角度控制导光板模块和LED光源模块,设定导光板靠近液晶层的一侧为外表面,与之相对的一侧为内表面,其特征是:角度控制导光板模块包括导光板一和导光板二;所述的导光板一的外表面贴有三棱柱阵列;所述的导光板二的内表面贴有增光片,外表面嵌有透镜阵列;所述的三棱柱阵列采用的是周期性排列的三棱柱的微小单元,三棱柱长棱相互平行且平行于导光板边界,三棱柱的主截面三角形的底角是不对称的;所述的增光片采用BEF系列的增光片;所述的透镜阵列采用的是周期性排列的微小椭圆透镜单元,椭圆的长轴为0.2mm,短轴为0.1mm,长轴相互平行且间距为0.2mm,短轴相互平行且间距为0.2mm,长轴与短轴分别平行于导光板边界;所述的LED光源模块包括:铝基电路板、扩散板、下扩散片,所述的铝基电路板的表面均匀铺设LED。
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CN113867051A (zh) * 2021-10-26 2021-12-31 深圳市锐思华创技术有限公司 一种高亮度且可控发光展角的背光模组

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9905142B2 (en) 2016-01-28 2018-02-27 International Business Machines Corporation Uni-directional and multi-directional interchangeable screen
CN113867051A (zh) * 2021-10-26 2021-12-31 深圳市锐思华创技术有限公司 一种高亮度且可控发光展角的背光模组

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