CN104635292A - 一种偏振光片及其制备方法和显示屏 - Google Patents

一种偏振光片及其制备方法和显示屏 Download PDF

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CN104635292A
CN104635292A CN201510112599.2A CN201510112599A CN104635292A CN 104635292 A CN104635292 A CN 104635292A CN 201510112599 A CN201510112599 A CN 201510112599A CN 104635292 A CN104635292 A CN 104635292A
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polarized light
light piece
layer
film
outside surface
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CN104635292B (zh
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王俊伟
于海峰
黄海琴
李东熙
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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Priority to PCT/CN2016/074445 priority patent/WO2016145975A1/zh
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    • 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
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    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
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    • 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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Abstract

本发明公开了一种偏振光片及其制备方法和显示屏，用以预防偏振光片在撕膜过程中产生mura，降低产品不良的概率。所述偏振光片，包括偏振光片偏光片主体层、保护膜层、导电层和离型膜；其中：所述偏光片主体层的第一外表面贴敷有所述保护膜层；所述偏光片主体层的第二外表面贴敷有所述离型膜；所述偏光片主体层的外围贴敷有所述导电层。

Description

一种偏振光片及其制备方法和显示屏
技术领域
本发明涉及液晶显示技术领域，尤其涉及一种偏振光片及其制备方法和显示屏。
背景技术
ADS(高级超维场转换，Advanced Super Dimension Switch)技术是以宽视角技术为代表的核心技术统称。ADS技术是为解决大尺寸、高清晰度桌面显示器和液晶电视应用而开发的广视角技术，其是硬屏技术的一种。ADS技术克服了常规IPS(In-Plane-Switching，平面方向转换)技术透光效率低的问题，在宽视角的前提下，实现高的透光效率。
ADS显示面板产品在撕膜过程中容易产生大量静电，某些异常情况下，产生的静电不能快速耗散，进而引起了液晶的极化，导致不可恢复的mura(即显示器亮度不均匀,造成各种痕迹的现象)。
现有的ADS产品制备流程无对这一制程的特殊处理，一般是在撕膜后即时组装模组，并贴付导电胶带(一般宽约1cm,长约1cm,左右各贴一个)将CF(彩色滤光片，Color Filter)ITO(铟锡氧化物，Indium Tin Oxides)和产品外框相连接，这样，可能存在一定程度的随机不良，增加了产品不良的概率。
发明内容
本发明实施例提供一种偏振光片及其制备方法和显示屏，用以预防偏振光片在撕膜过程中产生mura，降低产品不良的概率，简化了模组工序，防止漏贴导电。
本发明实施例提供一种偏振光片，包括偏振光片主体层、保护膜层、导电层和离型膜；其中：
所述偏光片主体层的第一外表面贴敷有所述保护膜层；
所述偏光片主体层的第二外表面贴敷有所述离型膜；
所述偏光片主体层的外围贴敷有所述导电层。
所述偏光片主体层的第一外表面蒸镀有金属膜，所述金属膜格栅产生的偏振方向与所述偏光片主体层的偏振方向一致。
所述金属膜包括铝膜或者铜膜。
所述保护膜层通过压敏胶层贴敷于所述偏光片主体层的第一外表面。
所述压敏胶层为导电扩散性参数大于预设阈值的胶层。
所述压敏胶层为导电聚合物材料、电网络、炭黑掺杂或者导电粒子掺杂的材料。
所述保护膜层的尺寸大于所述偏光片主体层的尺寸；
所述保护膜层与所述导电层通过导电胶层粘合。
所述离型膜层与所述导电层通过导电胶层粘合。
所述导电层为炭黑胶层或者铝膜。
本发明实施例提供一种偏振光片制备方法，包括：
将外表面和外围贴敷有离型膜的偏振光片剪切至预设尺寸；
去除所述偏光片其中一个表面和外围的离型膜后，在去除离型膜的表面贴敷保护膜层；以及
在所述偏光片的外围贴敷导电层；并在所述导电层外围贴敷离型膜。
本发明实施例提供一种高级超维场转换显示屏，包括一液晶面板和两个上述去除离型膜后的偏振光片；其中：
第一偏振光片通过所述第一偏振光片的第二外表面贴敷于所述液晶面板的第一外表面；
第二偏振光片通过所述第二偏振光片的第二外表面贴敷于所述液晶面板的第二外表面。
本发明实施例提供的偏振光片及其制备方法和显示屏，在偏光片外围增加导电层，这样，在撕膜过程中，产生的静电会通过导电层向接地的四周扩散，将电荷耗散掉和传导到地，本发明实施例提供的偏光片从便于工艺生产，增强偏振光片自身导电性出发，通过结构设计增加了电荷的导通性能和增加了更多的电荷释放路径，减少了静电mura的发生，降低了产品不良的概率。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在所写的说明书、权利要求书、以及附图中所特别指出的结构来实现和获得。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本发明的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1a为本发明实施例中，偏振光片的基本结构示意图；
图1b为本发明实施例中，偏振光片外围的剖面示意图；
图2为本发明实施例中，撕膜过程中，静电释放路径示意图
图3a为本发明实施例中，偏振光片的制备流程示意图；
图3b为本发明实施例中，导电层的贴敷示意图；
图4a为本发明实施例中，显示屏的结构示意图；
图4b为本发明实施例中，液晶面板与偏振光片贴合处的剖面示意图。
具体实施方式
为解决现有技术中，在显示面板产品撕膜过程中产生大量静电导致mura，增加产品不良概率的问题，本发明实施例中，通过对偏振光片结构进行预加工，使在撕膜过程中可以有效释放产生的静电，预防静电mura的发生，降低产品不良的概率。
以下结合说明书附图对本发明的优选实施例进行说明，应当理解，此处所描述的优选实施例仅用于说明和解释本发明，并不用于限定本发明，并且在不冲突的情况下，本发明中的实施例及实施例中的特征可以相互组合。
实施例一
本发明实施例提供的偏振光片包括偏振光片主体层11、保护膜层12、导电层13和离型膜14，其中：偏光片主体层11的第一外表面贴敷有保护膜层12；偏光片主体层11的第二外表面贴敷有离型膜14；偏光片主体层11的外围贴敷有导电层13。如图1a所示，为本发明实施例提供的偏振光片的基本结构示意图，由下至上依次为离型膜14，偏光片主体层11以及位于偏光片主体层11外围的导电层13，保护膜层12。其中，离型膜14可以包括两部分，一部分为与偏光片主体层11接触的离型膜141，另一部分为与导电层13接触的离型膜142。较佳的，离型膜142与导电层13之间可以通过导电胶层粘合。
通常，第一外表面可以为POL主体层中形成偏振光的表面，第二外表面即为POL主体层中与第一外表面相对的表面，POL主体层的其余外表面即为该POL主体层的外围。
需要说明的是，导电层13在贴敷到偏光片主体层11上之前也是两面具有保护膜的结构，在贴敷到偏光片上以后保留其中一面的保护膜。具体实施时，保护膜层12的尺寸可以略大于偏光片主体层11的尺寸，大于偏光片主体层11的部分可以由与偏光片主体层厚度相同的导体层13代替。如图1b所示，为本发明实施例提供的偏振光片外围的剖面示意图。导电层13与保护膜层12之间通过粘合剂粘合。较佳的，该粘合剂可以为导电胶层。
本发明实施例提供的偏振光片，通过在偏光片主体层11外围四周贴敷导电层13.在撕膜过程中，产生的静电可以通过导电层向接地的四周扩散，四周的导电胶层与液晶面板表面的金属接触，金属通过模组与地接触，从而可以将电荷耗散掉和传导到地。从而，避免在撕膜过程中由于产生的静电不能快速耗散导致不可恢复的mura，增加产品不良概率的问题。
实施例二
本发明实施例提供的偏振光片，通过结构设计增加了电荷的导通性和增加了电荷的释放路径。较佳的，具体实施时，保护膜层12通过压敏胶层贴敷于偏光片主体层11上。为了进一步提高电荷的导通性，该保护膜层12的压敏胶层可以为经过特殊处理的具有良好的导电扩散性的胶层，可以选择导电扩散性参数大于预设阈值的胶层。例如，该压敏胶层可以但不限于为导电聚合物材料、电网络、炭黑掺杂或者导电粒子掺杂的材料。
实施例三
为了进一步提高电荷的导通性，本发明实施例提供的偏振光片在与保护膜层12接触的表面蒸镀有金属膜。具体实施时，一般的金属膜均可以。金属膜不仅具有良好的导电性，又可通过格栅结构产生偏振光，金属膜的格栅结构是指像光栅一样的条状漏光结构，通常光栅的狭缝在mm(毫米)量级。具体实施时，考虑到工艺加工难度，较佳的，该金属膜可以为铜膜或者铝膜。更佳的，金属膜格栅产生的偏振方向与偏光片主体层11的偏振方向一致。
具体实施时，导电层13的厚度与偏光片主体层11的厚度相同或者接近，具有良好的导电性。较佳的，其与保护膜层12连接的一面粘性较强，与离型膜14连接的一面粘性较弱。较佳的，导电层13可以为炭黑胶层或者铝膜，厚度与偏光膜主体层11厚度相当，较佳的，导电层厚度可以在50～200um之间。
如图2所示，为本发明实施例提供的偏振光片电荷释放路径示意图。
本发明实施例中增强偏光片自身导电性出发，在偏光片主体层与保护膜层之间的压敏胶层中添加静电扩散材料，并且在偏光片外围的四周增加导电层。这样，在撕膜过程中，产生的静电会通过导电层、偏光片表面向接地的四周扩散，四周的导电层与面板表面的金属接触，金属通过模组与地接触，将电荷耗散掉和传导到地，其基本的原理即为通过结构设计增加了电荷的导通性能和增加了更多的电荷释放路径。
实施例四
如图3a所示，为本发明实施例提供的偏振光片的制备示意图，可以包括以下步骤：
S31、将外表面和外围贴敷有离型膜的偏振光片剪切至预设尺寸。
S32、去除该偏光片其中一个表面和外围的离型膜后，在去除离型膜的偏光片的表面贴敷保护膜层。
S33、在该偏光片的外围贴敷导电层，并在导电层外围贴敷离型膜。
如图3b所示，为保护膜层和导电层的贴敷示意图。
基于同一发明构思，本发明实施例中还提供了一种显示屏，由于该显示屏解决问题的原理与上述的偏振光片相似，因此其实施可以参见偏振光片的实施，重复之处不再赘述。
实施例五
如图4a所示，为本发明实施例提供的显示屏的结构示意图，包括一液晶面板41和两个去除离型膜后的、上述的偏振光片42；其中：第一偏振光片421通过第一偏振光片421的第二外表面贴敷于液晶面板41的第一外表面；第二偏振光片422通过第二偏振光片422的第二外表面贴敷于液晶面板41的第二外表面。如图4b所示，其为液晶面板41与偏振光片42贴合处的剖面示意图。图4b中，TAC是三醋酸纤维脂，PVA是聚乙烯醇，两层TAC之间夹着PVA成膜，组成偏光片主体层，其中，TAC的作用是保证PVA拉伸后的延展和机械强度。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例做出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (11)

1.一种偏振光片，其特征在于，包括偏振光片主体层、保护膜层、导电层和离型膜；其中：
所述偏光片主体层的第一外表面贴敷有所述保护膜层；
所述偏光片主体层的第二外表面贴敷有所述离型膜；
所述偏光片主体层的外围贴敷有所述导电层。
2.如权利要求1所述的偏振光片，其特征在于，
所述偏光片主体层的第一外表面蒸镀有金属膜，所述金属膜格栅产生的偏振方向与所述偏光片主体层的偏振方向一致。
3.如权利要求2所述的偏振光片，其特征在于，所述金属膜包括铝膜或者铜膜。
4.如权利要求1所述的偏振光片，其特征在于，所述保护膜层通过压敏胶层贴敷于所述偏光片主体层的第一外表面。
5.如权利要求4所述的偏振光片，其特征在于，所述压敏胶层为导电扩散性参数大于预设阈值的胶层。
6.如权利要求5所述的偏振光片，其特征在于，所述压敏胶层为导电聚合物材料、电网络、炭黑掺杂或者导电粒子掺杂的材料。
7.如权利要求1所述的偏振光片，其特征在于，所述保护膜层的尺寸大于所述偏光片主体层的尺寸；以及
所述保护膜层与所述导电层通过导电胶层粘合。
8.如权利要求1所述的偏振光片，其特征在于，
所述离型膜层与所述导电层通过导电胶层粘合。
9.如权利要求1～8任一权利要求所述的偏振光片，其特征在于，所述导电层为炭黑胶层者铝膜。
10.一种偏振光片制备方法，其特征在于，包括：
将外表面和外围贴敷有离型膜的偏振光片剪切至预设尺寸；
去除所述偏光片其中一个表面和外围的离型膜后，在去除离型膜的表面贴敷保护膜层；以及
在所述偏光片的外围贴敷导电层；并在所述导电层外围贴敷离型膜。
11.一种显示屏，其特征在于，包括一液晶面板和两个去除离型膜后的、如权利要求1～9任一权利要求所述的偏振光片；其中：
第一偏振光片通过所述第一偏振光片的第二外表面贴敷于所述液晶面板的第一外表面；
第二偏振光片通过所述第二偏振光片的第二外表面贴敷于所述液晶面板的第二外表面。
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