CN111435186A - 导光组件、背光模组以及显示设备 - Google Patents

导光组件、背光模组以及显示设备 Download PDF

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CN111435186A
CN111435186A CN201910037552.2A CN201910037552A CN111435186A CN 111435186 A CN111435186 A CN 111435186A CN 201910037552 A CN201910037552 A CN 201910037552A CN 111435186 A CN111435186 A CN 111435186A
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light
light guide
backlight
guide plate
guide assembly
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张燕妮
张佳煌
叶志雄
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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 CN201910037552.2A priority Critical patent/CN111435186A/zh
Priority to TW108102426A priority patent/TW202028826A/zh
Priority to US16/276,929 priority patent/US20200225398A1/en
Publication of CN111435186A publication Critical patent/CN111435186A/zh
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    • 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
    • G02B6/005—Means 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
    • G02B6/0055—Reflecting element, sheet or layer
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    • 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
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    • 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
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    • 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
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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

本发明提供了一种用于将侧入式的背光形成面光源的导光组件，包括导光板，所述导光板包括入光面、出光面与底面，所述出光面与所述底面相对设置，所述入光面连接于所述出光面与所述底面之间，所述背光自所述入光面进入所述导光板，所述底面包括不重叠的粘接区与散射区，所述粘接区设置于所述底面的至少部分边缘区域；反射片，用于反射自所述底面出射的所述背光；以及胶层，粘接于所述反射片与所述导光板的粘接区之间。本发明还提供了包括该导光组件的背光模组和显示设备，有利于减少胶层的用量以降低成本，并降低胶层对背光的光损率从而提升光效。

Description

导光组件、背光模组以及显示设备
技术领域
本发明涉及显示技术领域，尤其涉及一种导光组件、背光模组以及显示设备。
背景技术
液晶显示器是一种被动发光器件，需要背光模组(Backlight Unite，BLU)给液晶显示器提供光源使其显示图像。背光模组可包括光源与导光板，导光板引导从光源所发出光束的传输方向，将线光源或点光源转换成面光源。导光板是背光模组的核心部件，其主要作用在于合理引导光的散射方向，从而为液晶面板提供亮度高、均匀性好的面光源。
目前超薄型液晶显示器大多采用如图1所示的背光模组10，采用整片光学胶层130反射片120全贴合于刚性较强的导光板110上，以减小背板厚度，使得液晶显示器达到轻薄化的效果。一方面光学胶层130会吸收自光源101发出的背光的部份光通量，另一方面光学胶层130与导光板110紧密贴合也会影响经反射片120反射回导光板110的背光，造成散射微结构出光率的下降，从而造成光能的损失。另外，全平面贴合的方式重工操作难度大，将光学胶层130撕离导光板110的过程容易对散射微结构产生二次伤害。
发明内容
本发明第一方面提供一种导光组件，包括：
导光板，包括入光面、出光面与底面，所述出光面与所述底面相对设置，所述入光面连接于所述出光面与所述底面之间，所述背光自所述入光面进入所述导光板，所述底面包括粘接区及与该粘接区邻接的散射区，所述粘接区设置于所述底面的至少部分边缘区域；
反射片，用于反射自所述底面出射的所述背光；以及
胶层，粘接于所述反射片与所述导光板的粘接区之间
本发明第二方面提供一种背光模组，包括：
上述导光组件，以及包括设置于所述导光板的入光面一侧的光源，所述光源发出的背光经过所述入光面以及所述出光面从所述背光模组出射。
本发明第三方面提供一种显示设备，包括：
显示面板以及上述背光模组，所述背光模组出射的背光经过所述显示面板形成待显示的图像画面。
本发明提供的导光组件有利于减少胶层对背光的吸收，提高了导光组件的光效，降低了背光模组和显示设备的制造成本。此外，导光组件能够降低传统背光模组中重工操作对导光板的散射微结构造成的二次伤害。
附图说明
为了更清楚地说明本发明实施例/方式技术方案，下面将对实施例/方式描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例/方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为传统背光模组的反射片和导光板的全贴合结构图。
图2为本发明实施例提供的背光模组的剖面结构图。
图3为本发明一实施例提供的导光组件的导光板的底面结构图。
图4为本发明另一实施例提供的导光组件的导光板的底面结构图。
图5为散射微结构为油墨时散射微结构在散射区上的分布规律示意图。
图6为散射微结构为油墨时本发明实施例提供的导光组件的剖面结构图。
图7为散射微结构为凹槽时散射微结构在散射区上的分布规律示意图。
图8为散射微结构为凹槽时本发明一种实施例提供的导光组件的剖面结构图。
图9为散射微结构为凹槽时本发明另一种实施例提供的导光组件的剖面结构图。
图10为本发明实施例提供的显示设备的结构示意图。
主要元件符号说明
显示设备 30
背光模组 10、20
光源 101、201
导光组件 200
导光板 110、210
入光面 211
出光面 212
底面 213
粘接区 S1
散射区 S2
散射微结构 213a、213b
反射片 120、220
胶层 130、230
显示面板 40
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。
本发明实施例提供的导光组件和背光模组可应用于平面光源装置产品，本发明实施例提供的显示装置可为液晶电视、手机以及其他平面显示器。本发明实施例提供的导光组件有利于减少胶层对背光的吸收，提高了导光组件的光效，减少了胶层中光学固体胶的用量从而降低了背光模组的制造成本。此外，该导光组件还能够降低传统背光模组中重工操作对导光板的散射微结构造成的二次伤害。
请参阅图2，本实施例提供的背光模组20包括导光组件200和光源201。其中，光源201用于发出背光；导光组件200用于将侧入式的背光进行扩散并均匀出射形成面光源。
导光组件200包括导光板210、反射片220以及胶层230，其中，导光板210用于对光源201发出的背光进行扩散，反射片220设置于导光板210的一侧，用于反射自导光板210出射的背光，使得背光能够均匀地从导光板210背离反射片220的一侧出射；胶层230用于粘接导光板210和反射片220。
在一种实施例中，导光板210为玻璃板。在另一种实施例中，导光板210可为塑料，如亚克力板。导光板210的形状可为矩形、圆形、椭圆形、三角形或其他任意形状。进一步地，导光板210包括入光面211、出光面212与底面213，出光面212与底面213相对设置，入光面211连接于出光面212与底面213之间，背光自入光面211进入导光板210。光源201设置于导光板210的入光面211一侧，光源201发出的背光经过入光面211以及出光面212从背光模组20出射。
进一步地，底面213包括粘接区S1及与粘接区S1邻接的散射区S2，粘接区S1设置于底面213的至少部分边缘区域。在一种实施例中，导光板210呈矩形，底面213为矩形的表面，粘接区S1设置于底面213除靠近入光面211一侧的至少两侧的边缘区域。请参阅图3，一种实施例中，粘接区S1设置于与底面213靠近入光面211的一侧相邻的两侧的边缘区域。在另一种实施例中，请参阅图4，粘接区S1还包括底面213的与入光面211相对的一侧的边缘区域。散射区S2包括底面213除粘接区S1以外的区域，散射区S2包括多个间隔分布的散射微结构，所述散射微结构用于使背光发生散射并自导光板210的出光面212出射。在其他实施例中，粘接区S1和散射区S2可分离设置。
由于背光在导光板210中传播时不断在散射微结构上发生散射，因此背光的光通量在传播路径上逐渐衰减，导致导光板210在离入光面较远的区域的出光率降低。因此，可通过增大所述散射微结构在距离入光面较远处对背光的散射作用，来改善背光在传播过程中光通量衰减导致的亮暗分布不均的问题。请一并参阅图5和图6，本实施例中散射区S2的散射微结构213a为形成于底面213上的油墨，所述油墨可通过丝网印刷或喷印的方法形成于导光板210的底面213，底面213上与入光面211的距离越远的位置，散射微结构213a的密度越大，其中光源201发出的背光沿图中方向D传播。
在一种变更的实施例中，请参阅图7，散射区S2的散射微结构213b为向出光面212方向凹陷的凹槽，底面213上与入光面211的距离越远的位置，散射微结构213b的密度越大。在一种实施例中，请参阅图8，图8为图4的I线处的剖面结构图，所述凹槽的凹陷深度随所述凹槽与入光面211的距离的增大而增大，每个凹槽的开口大小可以相同也可以不同。在另一种实施例中，请参阅图9，图9为图4的I线处的剖面结构图，所述凹槽的开口随所述凹槽与入光面211的距离的增大而减小，每个凹槽的凹陷深度可以相同也可以不同。所述凹槽可由镭射、热压、蚀刻等方式制得，凹槽的形状可为半圆槽、圆锥槽、倒棱锥槽或其他形状，具体形状可根据实际情况进行调整。在其他实施例中，所述散射微结构的类型、密度、尺寸等特性可根据实际情况进行调整。
传统的背光模组中，导光板上散射微结构的类型和分布规律需根据贴合的光学胶层的类型、配方进行专门的设计，而本实施例提供的导光组件200在导光板210的散射区S2与反射片220之间无胶层230的填充，故而可与不同设计的所述散射微结构配合工作。可以理解，导光板210中的所述散射微结构的设计不局限于本发明实施例所提及的方式，因此本发明提供的导光组件200不需要专门对导光板210中的所述散射微结构进行设计，实用性强。
请一并参阅图3和图4，胶层230设置于导光板210的粘接区S1上，用于粘接反射片220与导光板210的粘接区S1，胶层230为光学固态胶。本实施例中，胶层230为光学透明胶(Optically Clear Adhesive，OCA)。在另一种实施例中，胶层230为以丙烯酸基材和丙烯酸胶组成的VHB双面胶。在其他实施例中，胶层230还可以为亚克力发泡双面胶或其他具有双面粘性的固体胶。
请再参阅图2，光源201发出的背光入射至导光板210后有两类光路路径，第一类为背光入射至导光板210的所述散射微结构上，此时背光会向各个角度扩散，由导光板210的出光面射出；第二类背光没有入射至所述散射微结构上，而是直接穿过导光板210的底面213后透过空气层入射至具有镜面反射功能的反射片220上发生镜面反射，背光在空气层中往背离光源201的方向前进直到碰到所述散射微结构后进入导光板210。本实施例中，反射片220的厚度范围为40～300微米。在其他实施例中，胶层230的厚度范围可根据实际情况进行调整。
由于背光在空气中传播的光损失量远远小于背光在胶层230中传播的光损失量，因此和传统背光模组中反射片和导光板之间通过光学胶层进行全贴合的方式相比，导光组件200有利于减少胶层230对背光的吸收，提高了导光组件200的光效，亮度可增加10％以上，减少了胶层230中光学固体胶的用量从而降低了背光模组20的制造成本。此外，导光组件200能够改善传统背光模组中重工操作对导光板210的散射微结构造成的二次伤害。
请参阅图10，本实施例提供的显示设备30包括背光模组20和显示面板40，背光模组20出射的背光经过显示面板40形成待显示的图像画面。
需要说明的是，在本发明的精神范围或基本特征内，各个实施例中的显示设备的具体技术方案可以相互适用，为节省篇幅及避免重复起见，在此就不再赘述。
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化涵括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。此外，显然“包括”一词不排除其他单元或步骤，单数不排除复数。装置权利要求中陈述的多个装置也可以由同一个装置或系统通过软件或者硬件来实现。第一，第二等词语用来表示名称，而并不表示任何特定的顺序。
最后应说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或等同替换，而不脱离本发明技术方案的精神和范围。

Claims (10)

1.一种导光组件，用于将侧入式的背光形成面光源，其特征在于，包括：
导光板，包括入光面、出光面与底面，所述出光面与所述底面相对设置，所述入光面连接于所述出光面与所述底面之间，所述背光自所述入光面进入所述导光板，所述底面包括粘接区及与该粘接区邻接的散射区，所述粘接区设置于所述底面的至少部分边缘区域；
反射片，用于反射自所述底面出射的所述背光；以及
胶层，粘接于所述反射片与所述导光板的粘接区之间。
2.如权利要求1所述的导光组件，其特征在于，所述导光板呈矩形，所述粘接区设置于所述底面除靠近所述入光面一侧的至少两侧的边缘区域。
3.如权利要求2所述的导光组件，其特征在于，所述粘接区设置于所述底面的相对两侧的边缘区域。
4.如权利要求1所述的导光组件，其特征在于，所述散射区间隔设置有多个散射微结构，所述散射微结构为形成于所述底面的油墨或者是向所述出光面方向凹陷的多个凹槽。
5.如权利要求4所述的导光组件，其特征在于，所述底面上与所述入光面的距离越远的位置，所述散射微结构的密度越大。
6.如权利要求5所述的导光组件，其特征在于，所述底面上与所述入光面的距离越远的位置，所述凹槽的凹陷深度越大。
7.如权利要求5所述的导光组件，其特征在于，所述底面上与所述入光面的距离越远的位置，所述凹槽的开口越小。
8.如权利要求1-7任意一项所述的导光组件，其特征在于，所述胶层的厚度范围为40～300微米。
9.一种背光模组，其特征在于，所述背光模组包括如权利要求1-8任意一项所述的导光组件，以及包括设置于所述导光板的入光面一侧的光源，所述光源发出的背光经过所述入光面以及所述出光面从所述背光模组出射。
10.一种显示设备，其特征在于，所述显示设备包括显示面板以及如权利要求9所述的背光模组，所述背光模组出射的背光经过所述显示面板形成待显示的图像画面。
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