CN102809864A - 电泳显示器 - Google Patents

电泳显示器 Download PDF

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CN102809864A
CN102809864A CN2011102150781A CN201110215078A CN102809864A CN 102809864 A CN102809864 A CN 102809864A CN 2011102150781 A CN2011102150781 A CN 2011102150781A CN 201110215078 A CN201110215078 A CN 201110215078A CN 102809864 A CN102809864 A CN 102809864A
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electrophoretic display
epd
display device
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CN102809864B (zh
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赖钦诠
王以靓
蔡渊智
沈琪灿
陈礼廷
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E Ink Holdings Inc
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    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
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    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
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Abstract

本发明在此揭露一种电泳显示器，其包含第一基板、电泳显示层、第二基板、表面应力层以及粘着层。第一基板包含至少一驱动组件以及至少一像素电极，像素电极电性连接驱动组件。电泳显示层配置于像素电极上方。第二基板配置在电泳显示层上方。表面应力层位于第二基板的下表面。粘着层配置在表面应力层与电泳显示层之间，且接触表面应力层与电泳显示层。上述表面应力层与粘着层间的粘着力为电泳显示层与粘着层间的粘着力的约75％至约125％。

Description

电泳显示器
技术领域
本发明是有关于一种电泳显示器。
背景技术
近年来，软性显示器以及电子纸与电子书正蓬勃发展，所使用的显示显示器种类包括液晶显示器、电泳显示器、电致变色显色器与电解析出显示器。
电泳显示器(Electrophoretic Display)为一种通过电场来控制带电颜料粒子分布型态，进而改变显示区对环境光的反射率来产生显示效果。此显示器具有以下几种特点：可挠性；利用环境光源即可观看；没有视角的限制；以及低耗电量，是发展电子纸的重要技术之一。
电泳显示器中包含有多个电泳显示单元，每一电泳显示单元内具有多数带电颜料粒子以及溶剂，带电颜料粒子分散在溶剂中。当带电颜料粒子受到外加电场作用时，会朝着与其电性相反的电极移动，这种现象被称为电泳。电泳的速度会随着带电粒子的种类、粒径、浓度，与外加电场强弱、分布、方向，及悬浮液的种类、粒子浓度等因素，而有不同的行为。电泳显示器即依据此特性达到各种不同的显示目的。借着控制带电颜料粒子于每一像素中的移动，可在显示器的显示表面上表示视觉信息。通常，溶剂及带电颜料粒子两者具有大约相同的比重。因此，纵使电场消失后，带电颜料粒子能在先前加上电场所固定的位置上维持一段相当长的时间，例如由数分钟至约二十分钟。基于上述特性，可预期电泳显示器具有低耗电量。再者，电泳显示器可以不需要背面照明。此外，电泳显示器可产生对人类眼睛柔和且视觉细腻的彩色及阴影。且、相较于液晶显示器，电泳显示器具有成本优势。
虽然电泳显示器具备上述多项优势，但是电泳显示器的画面均匀性不易控制，这也影响其市场接受度。举例而言，电泳显示器边缘常出现异常的显示状况，这也造成电泳显示器在量产上的困扰。因此，目前亟需一种可以能提供画面均匀性良好的电泳显示器。
发明内容
本发明的一目的是提供一电泳显示器，以能呈现均匀的显示效果。
根据本发明的实施方式，此电泳显示器包含一第一基板、一电泳显示层、一第二基板、一表面应力层以及一粘着层。第一基板包含至少一驱动组件以及至少一像素电极，像素电极电性连接驱动组件。电泳显示层配置于像素电极上方。第二基板配置在电泳显示层上方。表面应力层位于第二基板的下表面。粘着层配置在表面应力层与电泳显示层之间，且接触表面应力层与电泳显示层。上述表面应力层与粘着层间的粘着力为电泳显示层与粘着层间的粘着力的约75％至约125％。
根据本发明一实施例，表面应力层与粘着层间的粘着力为电泳显示层与粘着层间的粘着力的约85％至约115％。在另一实施例中，表面应力层与粘着层间的粘着力大于或等于电泳显示层与粘着层间的粘着力。在其它实施例中，表面应力层可例如为一含氟高分子绝缘材料所制成。表面应力层的厚度可例如为约0.2μm至约2μm。
根据本发明一实施例，电泳显示层包含一聚乙烯对苯二甲酸酯(PET)基材以及多个电泳显示单元配置于聚乙烯对苯二甲酸酯基材的下表面，此聚乙烯对苯二甲酸酯基材接触于粘着层。上述的电泳显示单元可例如为一微杯式电泳显示单元或一微胶囊式电泳显示单元。
根据本发明一实施例，粘着层可例如为一光硬化胶所制成。
根据本发明一实施例，第二基板包括一透明基板、一彩色光阻层以及一透明电极层。彩色光阻层配置在透明基板上。透明电极层配置在彩色光阻层上，而表面应力层配置在透明电极层上。
根据本发明一实施例，驱动组件可例如为一薄膜晶体管或一金属氧化物半导体晶体管。
本发明的电泳显示器能呈现均匀的显示效果。
附图说明
为让本发明的上述和其它目的、特征、优点与实施例能更明显易懂，所附附图的说明如下：
图1是绘示本发明一实施方式的电泳显示器的剖面示意图；
图2A及图2B是绘示本发明一比较例的剖面示意图；
图3是绘示本发明另一实施方式的电泳显示器的剖面示意图。
【主要组件符号说明】
100电泳显示器
102电泳显示器外缘
110第一基板
111上表面
112驱动组件
114像素电极
120电泳显示层
122基材
123下表面
124电泳显示单元
126胶层
130第二基板
131透明基板
132彩色光阻层
132R红色光阻层区域
132G绿色光阻层区域
132B蓝色光阻层区域
134透明电极层
140表面应力层
150粘着层
E，F箭头
具体实施方式
为了使本发明的叙述更加详尽与完备，下文针对了本发明的实施方式与具体实施例提出了说明性的描述；但这并非实施或运用本发明具体实施例的唯一形式。以下所揭露的各实施例，在有益的情形下可相互组合或取代，也可在一实施例中附加其它的实施例，而无须进一步的记载或说明。
请参照图1，其为本发明一实施方式的电泳显示器100的剖面示意图。电泳显示器100包括有第一基板110、电泳显示层120、第二基板130、表面应力层140以及粘着层150。
第一基板110包含至少一驱动组件112以及至少一像素电极114。如图所示，驱动组件112以及像素电极114可形成于第一基板110的上表面111，且像素电极114电性连接于驱动组件112。在穿透式的显示装置中，像素电极114可由诸如氧化铟锡(ITO)、氧化锌或其它透明导电体所制成。在反射式的显示装置中，像素电极114可由诸如铝或其它不透明金属所制成。驱动组件112可例如为一薄膜晶体管或一金属氧化物半导体晶体管。驱动组件112可用以控制以及传递一电压讯号至像素电极114，并藉由像素电极114产生电场而控制电泳显示层120的显示状态。
电泳显示层120配置于第一基板110的像素电极114上方，并可根据像素电极114的电场状态而改变显示状态。电泳显示层120的种类并无特殊限制，只要其可根据电场强度呈现不同的颜色或不同的光学状态。在一实施例中，电泳显示层120包含多个电泳显示单元124以及一聚乙烯对苯二甲酸酯(PET)基材122。电泳显示单元124可例如为一微杯式电泳显示单元或一微胶囊式电泳显示单元。电泳显示单元124配置于聚乙烯对苯二甲酸酯基材122的下表面123。因此，聚乙烯对苯二甲酸酯基材122直接接触上方的粘着层150。在另一实施例中，电泳显示层120通过一胶层126而被粘着于第一基板110上。
第二基板130配置于电泳显示层120上方。第二基板130可为一透明基板，例如玻璃基板或其它透明基板。在一实施例中，电泳显示器100为一反射式的显示器，入射光可经由第二基板130进入电泳显示层120，然后光线被电泳显示层120中的电泳显示单元124反射后，再经第二基板130而离开电泳显示器100。因此，使用者可在第二基板130的外侧观看及使用电泳显示器100。但是，本发明亦可使用于穿透式的显示装置中。
表面应力层140位于第二基板130的下表面，并与粘着层150相接触。因此，第二基板130不会直接接触粘着层150。在一实施例中，表面应力层140为一含氟高分子的绝缘材料所制成，其厚度可为约0.2μm至约2μm。在此实施例中，可通过一旋转涂布制程，先形成一含氟高分子的溶液层，然后再经由高温烘烤而形成表面应力层140于第二基板130的下表面。待表面应力层140硬化后，再以粘着层150与电泳显示层120粘合。
粘着层150配置于表面应力层140与电泳显示层120之间，且接触电泳显示层120与表面应力层140。粘着层150用以粘结第一基板110上的电泳显示层120与第二基板130上的表面应力层140，而使第一基板110、电泳显示层120、第二基板130以及表面应力层140形成密合的封装结构。在本实施例中，表面应力层140与粘着层150间的粘着力为电泳显示层120与粘着层150间的粘着力的约75％至约125％，例如为约85％至约115％。在一实施例中，表面应力层140与粘着层150间的粘着力大致等于电泳显示层120与粘着层150间的粘着力。在另一实施例中，表面应力层140与粘着层150间的粘着力略大于或大致等于电泳显示层120与粘着层150间的粘着力。粘着层150可例如为一紫外光硬化胶所制成。在一实施例中，粘着层150包覆电泳显示器100的外缘102，以增强第一基板110与第二基板130之间的接着强度，并可防止水气或污染物进入电泳显示器100中。
控制表面应力层140与粘着层150之间的粘着力以及电泳显示层120与粘着层150之间的粘着力是重要的。图2A绘示本发明一比较例的剖面示意图。在比较例中，第二基板130为玻璃基板，粘着层150为一紫外光硬化胶，电泳显示层120的基材122为PET材料所制成。第二基板130的下表面未设置表面应力层140，第二基板130直接与粘着层150接触。换言之，粘着层150直接将第二基板130粘结在电泳显示层120上。然而，比较例中的粘着层150在经过紫外光照射硬化后，粘着层150与电泳显示层120在局部区域发生剥离现象，且特别容易发生在电泳显示器100的边缘处，如图2A箭头F所指处。所以，光线在这剥离区域发生异常的光学路径，也因此造成电泳显示器100在边缘处的显示效果与其它正常区域不同。更严重时，甚至会发生如图2B箭头E所指的情况，电泳显示器100的边缘处的电泳显示层120自第一基板110上剥离，同时部分的粘着层150渗入电泳显示层120与第一基板110之间。因此，造成电泳显示器100的边缘处丧失正常的显示功能。
本发明的发明人为改善上述问题，尝试多种不同的制程条件以及不同粘着层材料，均不容易完全克服上述问题。发明人更进一步究其原因后发现，常用的粘着层材料与玻璃材料或类似玻璃材料之间的粘着力大于其它种基材材料。具体而言，粘着层150与玻璃基板之间的粘着力约为其与PET基材122之间粘着力的1.5倍。例如，在相同的接触面积下，粘着层150与玻璃基板之间的粘着力为约30Kg，而粘着层150与PET基材122之间粘着力仅约20Kg。换言之，粘着层150与第二基板130之间的粘着力远大于粘着层150与电泳显示层120的PET基材122之间的粘着力。当以紫外光照射而使粘着层150硬化时，粘着层150发生收缩(shrinkage)现象，再因上述粘着力的差异，而造成粘着层150与电泳显示层120在局部区域发生剥离现象。
因此，根据本发明的实施方式，在第二基板130的下表面设置表面应力层140，使表面应力层140与粘着层150间的粘着力为电泳显示层120与粘着层150间的粘着力的约75％至约125％，从而改善上述问题。
请参见图3，其为本发明另一实施方式的电泳显示器100的剖面示意图。在本实施方式中，电泳显示器100大致与图1绘示的实施方式相同，不同之处在于，第二基板130包括有一透明基板131、一彩色光阻层132以及一透明电极层134。彩色光阻层132配置在透明基板131的内侧表面上，而使电泳显示装置100呈现彩色的显示功能。详言之，可在透明基板131上形成图案化的红色光阻层区域132R、绿色光阻层区域132G及蓝色光阻层区域132B，且每一颜色的光阻层区域对应一个像素电极114。因此，可形成全彩的电泳显示器100。透明电极层134配置在彩色光阻层132上，并通过透明电极层134与像素电极114之间形成电场来控制电泳显示单元124的显示状态。在上述实施例中，表面应力层140配置在透明电极层134的下表面。表面应力层140与粘着层150相接触。在其它实施例中，电泳显示器100可为平面切换(In PlaneSwitching，IPS)式的显示器，因此彩色光阻层132上无须配置透明电极层134。在此实施例中，表面应力层140可配置在彩色光阻层132上。
虽然本发明已以实施方式揭露如上，然其并非用以限定本发明，任何熟悉此技艺者，在不脱离本发明的精神和范围内，当可作各种的更动与润饰，因此本发明的保护范围当视所附的权利要求书所界定的范围为准。

Claims (10)

1.一种电泳显示器，其特征在于，包含：
一第一基板，包含至少一驱动组件以及至少一像素电极电性连接该驱动组件；
一电泳显示层，配置于该像素电极上方；
一第二基板，配置于该电泳显示层上方；
一表面应力层，位于该第二基板的下表面；以及
一粘着层，配置于该表面应力层与该电泳显示层之间，且接触该表面应力层与该电泳显示层；
其中该表面应力层与该粘着层间的粘着力为该电泳显示层与该粘着层间的粘着力的75％至125％。
2.根据权利要求1所述的电泳显示器，其特征在于，该表面应力层与该粘着层间的粘着力为该电泳显示层与该粘着层间的粘着力的85％至115％。
3.根据权利要求1所述的电泳显示器，其特征在于，该表面应力层与该粘着层间的粘着力大于或等于该电泳显示层与该粘着层间的粘着力。
4.根据权利要求1所述的电泳显示器，其特征在于，该表面应力层为一含氟高分子绝缘材料所制成。
5.根据权利要求1所述的电泳显示器，其特征在于，该表面应力层的一厚度为0.2μm至2μm。
6.根据权利要求1所述的电泳显示器，其特征在于，该电泳显示层包含一聚乙烯对苯二甲酸酯基材以及多个电泳显示单元配置于该聚乙烯对苯二甲酸酯基材的下表面，使该聚乙烯对苯二甲酸酯基材接触该粘着层。
7.根据权利要求6所述的电泳显示器，其特征在于，该些电泳显示单元为一微杯式电泳显示单元或一微胶囊式电泳显示单元。
8.根据权利要求1所述的电泳显示器，其特征在于，该粘着层为一光硬化胶所制成。
9.根据权利要求1所述的电泳显示器，其特征在于，该第二基板包括：
一透明基板；
一彩色光阻层，配置于该透明基板上；以及
一透明电极层，配置于该彩色光阻层上；
其中该表面应力层配置在透明电极层上。
10.根据权利要求1所述的电泳显示器，其特征在于，该驱动组件为一薄膜晶体管或一金属氧化物半导体晶体管。
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