CN112002286B - 彩色显示装置的驱动方法 - Google Patents

彩色显示装置的驱动方法 Download PDF

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CN112002286B
CN112002286B CN202010766819.4A CN202010766819A CN112002286B CN 112002286 B CN112002286 B CN 112002286B CN 202010766819 A CN202010766819 A CN 202010766819A CN 112002286 B CN112002286 B CN 112002286B
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林怡璋
洪集茂
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E Ink Corp
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    • GPHYSICS
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    • 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 
    • G02F1/165Devices 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
    • G02F1/166Devices 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 characterised by the electro-optical or magneto-optical effect
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    • GPHYSICS
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    • 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
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    • G02F1/165Devices 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
    • G02F1/1675Constructional details
    • G02F1/1679Gaskets; Spacers; Sealing of cells; Filling or closing of cells
    • G02F1/1681Gaskets; Spacers; Sealing of cells; Filling or closing of cells having two or more microcells partitioned by walls, e.g. of microcup type
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    • G02OPTICS
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    • 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
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    • G02F2201/121Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode common or background
    • 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
    • G02F2201/00Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
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    • G02F2203/00Function characteristic
    • G02F2203/34Colour display without the use of colour mosaic filters
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Abstract

本发明提供电泳彩色显示装置的驱动方法。该驱动方法所使用的背板系统更为简化,其使得彩色显示装置更具成本效益。具体地说,该驱动方法包括首先通过只调制公共电极来驱动全部像素朝向一种颜色状态,随后,通过保持公共电极接地并且对像素电极施加不同电压来驱动全部像素朝向其期望的颜色状态。

Description

彩色显示装置的驱动方法
本申请是申请号为201480028727.9、发明名称为“彩色显示装置的 驱动方法”的中国专利申请的分案申请。
技术领域
本发明涉及彩色显示装置的驱动方法。该方法可以显著降低此种显示装置 所使用的有源矩阵背板的复杂性。
背景技术
为了实现彩色显示,常常使用彩色滤光片。最常用的方法是在像素化显示 器的黑/白亚像素上方添加彩色滤光片,以显示红、绿和蓝颜色。这种技术最大 的缺点是,其白色电平基本上小于黑白显示器的一半,因此其成为显示装置, 诸如需要良好阅读感的黑白亮度和对比度的电子阅读器或显示器,所不愿接受 的选择方案。
发明内容
本发明的第一方面涉及一种用于显示装置的驱动方法,该显示装置包括
(ⅰ)一电泳流体,该电泳流体包括第一类粒子、第二类粒子和第三类粒子, 该三类粒子都分散于溶剂或溶剂混合物中,其中该第一类粒子携带一种电荷极 性,同时该第二类和第三类粒子携带相反的电荷极性,以及
(ⅱ)多个像素,其中每个像素均夹在公共电极和像素电极之间,该方法包括
a)对所述像素电极不施加电压,并且对所述公共电极施加高电压,其中该高 电压具有与所述第一类粒子的电荷极性相反的极性,以便驱动全部像素朝向该 第一类粒子的颜色状态;
b)对所述像素电极不施加电压,并且对所述公共电极施加低电压,其中该 低电压具有与所述第三类粒子的电荷极性相反的极性,以便驱动全部像素朝向 该第三类粒子的颜色状态;以及
c)保持所述公共电极接地,并且对所述像素电极施加不同电压以驱动像素朝 向期望的颜色状态。
在一个实施例中,步骤(c)中,无电压施加到所述像素电极,以保持像素处 于所述第三类粒子的颜色状态中。
在一个实施例中,步骤(c)中,对所述像素电极施加高电压,其中该高电压 具有与所述第二类粒子相同的极性,以便驱动像素朝向该第二类粒子的颜色状 态。
在一个实施例中,步骤(c)中,对所述像素电极施加高电压,其中该高电压 具有与所述第一类粒子相同的极性,以便驱动像素朝向该第一类粒子的颜色状 态。
在一个实施例中,该方法在步骤(a)之前还包括振动波形。
在一个实施例中,所述第一类粒子带负电荷,而所述第二类和第三类粒子 带正电荷。
在一个实施例中,所述第一类粒子为白色粒子,所述第二类粒子为黑色粒 子,而所述第三类粒子为非白非黑粒子。
本发明的第二方面涉及一种用于显示装置的驱动方法,该显示装置包括
(ⅰ)一电泳流体,该电泳流体包括第一类粒子、第二类粒子、第三类粒子和 第四类粒子,该四类粒子都分散于溶剂或溶剂混合物中,其中该第一和第二类 粒子所带电荷相反,并且该第三和第四类粒子所带电荷相反,以及
(ⅱ)多个像素,其中每个像素均夹在公共电极和像素电极之间,该方法包括
a)对所述像素电极不施加电压,并且对所述公共电极施加高电压,其中该高 电压具有与所述第二类粒子的电荷极性相反的极性,以便驱动全部像素朝向该 第二类粒子的颜色状态;
b)对所述像素电极不施加电压,并且对所述公共电极施加低电压,其中该 低电压具有与所述第三类粒子的电荷极性相反的极性,以便驱动全部像素朝向 该第三类粒子的颜色状态;以及
c)保持所述公共电极接地,并且对所述像素电极施加不同电压以驱动像素朝 向期望的颜色状态。
在一个实施例中,步骤(c)中,无电压施加到所述像素电极,以保持像素处 于所述第三类粒子的颜色状态中。
在一个实施例中,步骤(c)中,对所述像素电极施加高电压,其中该高电压 具有与所述第一类粒子相同的极性,以便驱动像素朝向该第一类粒子的颜色状 态。
在一个实施例中,步骤(c)中,对所述像素电极施加高电压,其中该高电压 具有与所述第二类粒子相同的极性,以便驱动像素朝向该第二类粒子的颜色状 态。
在一个实施例中,步骤(c)中,对所述像素电极施加高电压,其中该高电压 具有与所述第一类粒子相同的极性,之后对所述像素电极施加低电压,其中该 低电压具有与所述第四类粒子相同的极性,以便驱动像素朝向该第四类粒子的 颜色状态。
在一个实施例中,该方法在步骤(a)之前还包括振动波形。
在一个实施例中,所述第一和第三类粒子带正电荷,而所述第二类和第四 类粒子带负电荷。
在一个实施例中,所述第一类粒子为黑色粒子,所述第二类粒子为黄色粒 子,所述第三类粒子为红色粒子,而所述第四类粒子为白色粒子。
在一个实施例中,所述第一类粒子为高正电粒子,所述第二类粒子为高负 电粒子,所述第三类粒子为低正电粒子,所述第四类粒子为低负电粒子。
本发明的第三方面涉及一种用于包含多个像素的彩色显示装置的驱动方 法,其中每个像素均夹在公共电极和像素电极之间,该方法包括:
a)通过只调制所述公共电极来驱动全部像素朝向一种颜色状态;以及
b)通过保持所述公共电极接地并且对所述像素电极施加不同电压来驱动全 部像素朝向期望的颜色状态。
在一个实施例中,该方法还包括振动波形。
本发明的第四方面涉及一种用于驱动一显示装置的背板系统,该显示装置 包括一电泳流体,其中该流体包括第一类粒子、第二类粒子和第三类粒子,该 三类粒子都分散于溶剂或溶剂混合物中,其中该第一类粒子携带一种电荷极性, 同时该第二和第三类粒子携带相反的电荷极性,该背板系统仅有三个电压等级, 0V、高正电压及高负电压。
本发明的第五方面涉及一种用于驱动一显示装置的背板系统,该显示装置 包括一电泳流体,其中该流体包括第一类粒子、第二类粒子、第三类粒子和第 四类粒子,该四类粒子都分散于溶剂或溶剂混合物中,其中该第一和第二类粒 子所带电荷相反,并且该第三和第四类粒子所带电荷相反,该背板系统仅有四个电压等级,0V、高正电压、高负电压以及低正电压或者低负电压。
附图说明
图1示出了本发明的显示层。
图2示出了包含三类粒子的电泳流体。
图3A-3B示出了三粒子流体系统的驱动顺序。
图4a、4b和5示出了用于该三粒子流体系统的本发明的驱动方法。
图6示出了包含四类粒子的电泳流体。
图7A-7C示出了四粒子流体系统的驱动顺序。
图8a、8b和9示出了本发明的用于该四粒子流体系统的驱动方法。
图10a、11a和12a是本发明驱动方法的执行的示意图。
图10b、11b和12b是现有技术中驱动方法的示意图。
具体实施方式
总述:
本发明的显示流体可包括三类或四类粒子。多种类型的粒子可以是任意颜 色,只要该颜色可以视觉识别即可。在所述流体中,粒子分散于溶剂或溶剂混 合物中。
对于白色粒子,其可以由无机颜料构成,诸如TiO2,ZrO2,ZnO, Al2O3,Sb2O3,BaSO4,PbSO4以及类似物。
对于黑色粒子,其可以由Cl颜料黑26或28或类似物(如铁锰黑或铜铬黑) 或者碳黑构成。
有色粒子(非白非黑)可以是诸如红、绿、蓝、洋红、青或黄颜色。用于 上述粒子的颜料可包括但不限于,Cl颜料PR 254,PR122,PR149,PG36, PG58,PG7,PB28,PB15:3,PY138,PY150,PY155和PY20。这些是颜色索 引手册“新颜料应用技术(New Pigment ApplicationTechnology)”(CMC出版有 限公司,1986)和“印刷油墨技术(Printing Ink Technology)”(CMC出版有限公司,1984)中所述的常用有机颜料。具体示例包括科莱恩(Clariant)Hostaperm红D3G 70-EDS,Hostaperm粉红E-EDS,PV快速红D3G,Hostaperm红D3G 70,Hostaperm蓝B2G-EDS,Hostaperm黄H4G-EDS,Hostaperm绿GNX,巴斯 夫加净红(BASFIrgazine red)L 3630,鲜贵色红(Cinquasia Red)L4100 HD, 及加净红(Irgazine Red)L3660 HD;太阳化学(Sun Chemical)酞菁蓝,酞菁 绿,联苯胺黄或联苯胺AAOT黄。
除颜色之外,所述多种类型的粒子还可以具有其他明显的光学特性,诸如 光透射,反射,发光或者,在设计用于机器阅读的显示器情况中,以可视范围 之外电磁波长的反射变化为形式的伪彩色。
如图1所示,采用本发明显示流体的显示层具有两个表面,第一表面(13) 在观看侧,第二表面(14)在该第一表面(13)的相反侧。该显示流体夹在所 述两个表面之间。在第一表面(13)的一边上有公共电极(11),其为透明电极 层(如,ITO),散布于显示层的整个顶部。在第二表面(14)的一边上有电极 层(12),其包括多个像素电极(12a)。
像素电极在美国专利No.7,046,228中已有描述,该案以引用方式并入本文。 应注意到,虽然带有薄膜晶体管(TFT)背板的有源矩阵驱动被提及用于像素电 极层,但本发明的范围还包含着其他类型的电极寻址,只要该电极能够满足功能需要。
图1中两条垂直虚线之间的空间代表一个像素。如图所示,每个像素均有 对应的像素电极。通过施加到公共电极的电压与施加到相应像素电极的电压之 间的电位差为像素创建电场。
所述多种类型的粒子可以具有不同的带电水平。在一个实施例中,弱电荷 粒子的电荷强度比强电荷粒子的电荷强度小约50%,或者是约5%-30%左右。 在另一实施例中,弱电荷粒子的电荷强度比强电荷粒子的电荷强度小约75%, 或者是约15%-55%左右。在又一实施例中,所示带电水平的比较适用于具有 相同电荷极性的两类粒子。
电荷强度可以用ζ(zeta)电位来测量。在一个实施例中,ζ电位由带有CSPU -100信号处理装置,ESA EN#Attn流通池(K:127)的胶体动力学声波粒度仪 IIM来测定。仪器常数,诸如样本中所用溶剂的密度,溶剂的介电常数,溶剂中 的音速,溶剂粘度,这些数据都在测试温度(25℃)条件下于测试前予以输入。颜料样本分散于溶剂中(其通常为具有小于12个碳原子的烃类液体),并且稀 释到5-10%,以重量计。该样本也含有电荷控制剂(17000,产自 路博润公司(Lubrizol Corporation),伯克希尔哈撒韦公司(Berkshire Hathaway)), 该电荷控制剂与粒子的重量比为1:10。经过稀释的样本质量被测定,然后将该样本装入流通池测量ζ电位。
如果同一流体中存在两对高-低电荷粒子,则该两对粒子可以具有不同的 电荷差水平。例如,在一对粒子中,低正电粒子的电荷强度可以是高正电粒子 电荷强度的30%。在另一对粒子中,低负电粒子的电荷强度可以是高负电粒子 电荷强度的50%。
将多种类型的粒子分散于其中的溶剂是无色透明的。该溶剂优选地具有低 粘度和大约2至30范围的介电常数,优选地具有大约2至15的高粒子迁移率。 适用的介电溶剂示例包括碳氢化合物,诸如异构烷烃、萘烷、5-亚乙基-2- 降冰片烯、脂油、石蜡油、矽液,芳香烃类诸如甲苯、二甲苯、苯基二甲基乙 烷、十二烷基苯或烷基萘,卤化溶剂诸如全氟萘烷、全氟甲基苯、全氟二甲苯、 二氯三氟甲苯、3,4,5-三氯三氟甲苯、一氯五氟化苯、二氯壬烷或五氯苯,以及 全氟溶剂诸如产自明尼苏达圣保罗的3M公司的FC-43,FC-70或FC-5060, 含有聚合物的低分子量卤素诸如产自美国俄勒冈波特兰的TCI公司的聚(全氟 丙烯氧化物),聚(三氟氯乙烯)诸如产自新泽西沿岸地区的卤烃产品公司 (HalocarbonProduct公司)的卤烃油,全氟聚醚诸如产自奥赛蒙特(Ausimont) 公司的胶登(Galden)系列或者杜邦公司的Krytox油和油脂K-流体系列,产 自道康宁公司(Dow-corning)的硅油基聚二甲基硅氧烷(DC-200)。
在本发明中,至少一类粒子可以显示电场阈值。在一个实施例中,一类高 电荷粒子具有电场阈值。
本发明文本中的术语“电场阈值”定义为在特定时间段内(通常不超过30秒, 优选不长于15秒)对一组粒子适用的最大电场,当像素从一种不同于该组粒子 的颜色状态被驱动时,其不造成该粒子在像素的观看侧显现。本申请书中的术 语“观看侧”是指显示层的第一表面,观众在此处可看到影像。
电场阈值或者是带电粒子的固有特征或者是添加剂诱发的特性。
在前者情况中,电场阈值的产生取决于带相反电荷的粒子之间或者粒子与 某些基底表面之间的特定吸收力。
在添加剂诱发电场阈值的情况中,可以加入诱发或强化电泳流体阈值特性 的阈值剂。该阈值剂可以是可溶于或可分散于电泳流体的溶剂或溶剂混合物中 并且携带或诱发与带电粒子相反电荷的任意材料。该阈值剂可以对所施加电压 的变化敏感或者不敏感。术语“阈值剂”可广泛包括染料或颜料,电解质或聚合 电解质,聚合物,低聚物,表面活性剂,电荷控制剂及类似物。
三粒子系统:
图2示出了如美国专利US2014-0092466中所述的三粒子流体系统,该案 以引用方式并入本文。
电泳流体包括分散于介电溶剂或溶剂混合物中的三类粒子。为便于说明, 所述三类粒子称为第一类粒子、第二类粒子和第三类粒子。如图2中示例所示, 第一类粒子为白色粒子(W);第二类粒子为黑色粒子(K);第三类粒子为红色 粒子(R)。该第三类粒子可以是非白非黑的任意颜色。
所述三类粒子中的两种(即第一和第二类粒子)具有相反的电荷极性,并 且第三类粒子携带与其他两类粒子中的其中一种相同的电荷极性。例如,如果 黑色粒子带正电而白色粒子带负电,那么红色粒子要么带正电要么带负电。
图3示出了此种彩色显示装置的驱动顺序。为便于说明,白色粒子(W) 带负电同时黑色粒子(K)带正电。红色粒子(R)携带与黑色粒子(K)相同 的电荷极性。
由于黑色与白色粒子之间的吸引力,黑色粒子(K)假定为具有电场阈值 lV。因此,如果施加电压的电位差是lV或更低的话,则黑色粒子不会移到观 看侧。
红色粒子携带的电荷弱于黑色和白色粒子的电荷。因此,当施加的电位差 高于lV时,由于黑色粒子携带强电荷,黑色粒子比红色粒子(R)移动得更快。
在图3a中,采用了高正电压电位差﹢hV。这种情况下,白色粒子(W)移 到靠近或位于像素电极(32a)处,而黑色粒子(K)和红色粒子(R)移到靠 近或位于公共电极(31)处。因此,在观看侧看到黑颜色。红色粒子(R)向公共电极(31)移动;不过由于其携带低电荷,所以移动得比黑色粒子(K)慢。
在图3b中,当采用了高负电压电位差﹣hV时,白色粒子(W)移到靠近 或位于公共电极(31)处,而黑色粒子(K)和红色粒子(R)移到靠近或位于 像素电极(32a)处。因此,在观看侧看到白颜色。红色粒子(R)向像素电极移动,因其也是带正电的。不过,由于它们的电荷强度较低,所以移动得比黑 色粒子慢。
在图3B的3(c)中,低正电压电位差﹢lV施加到图3B的3(a)中的像素(即, 从白色状态驱动)。在这种情况下,图3B的3(a)中带负电的白色粒子(W)向 像素电极(32a)移动。由于电场阈值是lV,所以黑色粒子(K)移动极小。因 红色粒子(R)不具有显著的电场阈值,所以其移到靠近或位于公共电极(31) 处,故观看侧看到红颜色。
应注意到,所施加低电压(﹢lV或﹣lV)的量级通常是驱动像素从黑色状 态到白色状态(﹣hV)或从白色状态到黑色状态(﹢hV)所需的全驱动电压量 级的约5%到50%。在一个实施例中,﹢hV和﹣hV可以分别是﹢15V和﹣15V, 而﹢lV和﹣lV可以分别是﹢3V和﹣3V。此外,还应注意到,﹢hV和﹣hV的 量级可以相同也可以不同。同样,﹢lV和﹣lV的量级可以相同也可以不同。
术语“驱动电压电位差”是指公共电极与像素电极之间的电压差。在先前的 驱动方法中,由全部像素共享的公共电极保持接地,而且每个像素被施加到相 应像素电极的电压所驱动。如果这种方法用于驱动图2和3中所述的流体系统,那么背板系统就需要在至少四个不同电压等级0V、﹢hV、﹣hV和﹢lV各有一 个像素电极。这样的背板系统运行成本很高,在下文部分另行解释。
本发明人现提出一种新型驱动方法,其中背板系统得以简化,同时仍可显 示高质量的颜色状态。
图4a和4b示出了本发明驱动方法的初始步骤,并且该步骤适用于全部像 素。首先施加振动波形,然后在第一阶段,对由全部像素共享的公共电极施加 ﹢hV,同时全部像素电极为0V,这导致全部像素的驱动电压电位差为﹣hV, 其驱动全部像素朝向白色状态(见图3A的3(a))。在第二阶段,﹣lV施加到公 共电极同时全部像素电极仍保持0V,这导致驱动电压电位差为﹢lV,其驱动全 部像素朝向红色状态(见图3B的3(c))。在初始步骤中,全部像素电极保持在 0V,同时公共电极被调制,从﹢hV到﹣lV切换。
在第一阶段之前施用的振动波形包括一对重复多个周期的相反驱动脉冲。 例如,该振动波形可以包括20毫秒的﹢15V脉冲以及20毫秒的﹣15V脉冲, 并且这一对脉冲重复50次。上述振动波形的总时间会是2000毫秒。
有了添加的振动波形,颜色状态(即,红色)在亮度和纯度方面可以比无 振动波形时明显改善。这表明白色粒子与红色粒子以及黑色粒子与红色粒子得 到更好的分离。
振动波形中的每个驱动脉冲的施用时间不超过从全黑色状态到全白色状态 所用驱动时间的一半,反之亦然。例如,如果用300毫秒将显示装置从全黑色 状态驱动到全白色状态,反之亦然,那么振动波形可以包括正、负脉冲,各施 用不超过150毫秒。在实践中,优选脉冲时间更短。
图5示出了该驱动方法的下一步骤。在此步骤中,全部像素同时被驱动到 其期望的颜色状态。在此步骤中,公共电极为0V接地,同时不同电压施加到像 素电极。对于停留在红色状态的像素,无电压施加到对应的像素电极,这导致无驱动电压电位差。对于黑色状态中的像素,﹢hV施加到对应的像素电极。对 于白色状态中的像素,﹣hV施加到对应的像素电极。
使用这种在初始步骤中调制公共电极的驱动方法,背板系统只需要在三个 不同电压等级0V、﹢hV和﹣hV各有一个像素电极即可,这比先前方法中所用 的背板系统更为简化。
图10a是示出了本发明驱动方法执行过程的简化示意图。如图所示,有三 个不同电压等级0V、﹢hV和﹣lV,其可以施加到公共电极(Vcom),以及有 三个不同电压等级0V、﹢hV和﹣hV,其可以施加到像素电极。
图10b是示出了对应的现有技术方法的示意图。图中,有三个电压等级﹢ hV、﹣hV和﹢lV,其可以施加到像素电极。已商业化量产的TFT背板通常只 具有支持0V、﹢hV和﹣hV的源极IC。因而,如果采用现有技术方法,则需要 修改源极IC以支持施加到像素电极的额外电压选项﹢lV。
四类粒子:
图6示出了一种备选显示装置,其中,电泳流体包括四类粒子分散于介电 溶剂或溶剂混合物中,如美国临时申请No.61/824,887所述,该案以引用方式并 入本文。为便于说明,所述四类粒子可称为第一类粒子,第二类粒子,第三类粒子和第四类粒子。如图6中示例所示,第一类粒子为黑色粒子(K);第二类 粒子为黄色粒子(Y);第三类粒子为红色粒子(R);以及第四类粒子为白色粒子(W)。
在此例中,黑色和黄色粒子携带相反极性的电荷。例如,如果黑色粒子带 正电,则黄色粒子带负电。红色和白色粒子也带相反极性的电荷。不过,黑色 和黄色粒子所携带的电荷强度大于红色和白色粒子的电荷。
例如,黑色粒子(K)带高正电;黄色粒子(Y)带高负电;红色粒子(R) 带低正电;而白色粒子(W)带低负电。这种彩色显示装置的驱动顺序如图7 所示。
在图7a中,当高负电压电位差(如﹣hV)施加到像素时,黄色粒子(Y) 被推向公共电极(71)侧并且黑色粒子(K)被拉向像素电极(72a)侧。红色 (R)和白色(W)粒子,因其电荷水平较低,所以移动得比高电荷的黑色和黄色粒子慢,故停留在公共电极与像素电极之间,白色粒子在红色粒子上方。结 果是,黄颜色在观看侧可见。
在图7b中,当高正电压电位差(如﹢hV)施加到像素时,粒子分布与图 7a所示相反,因此,黑颜色在观看侧可见。
在图7c中,当低正电压电位差(如﹢lV)施加到图7a的像素时(即,从 黄色状态驱动),黄色粒子(Y)向像素电极(72a)移动,同时黑色粒子(K) 向公共电极(71)移动。不过,当它们因彼此间强大的吸引力而在移动过程中 相遇时,则会停止移动并且停留在公共电极与像素电极之间。低电荷(正)红 色粒子(R)一直向公共电极(71)侧(即,观看侧)移动,并且低电荷(负) 白色粒子(W)向像素电极(72a)侧移动。结果是,红颜色可见。
在图7C的7(d)中,当低负电压电位差(如﹣lV)施加到图7C的7(b)的像 素时(即,从黑色状态驱动),黑色粒子(K)向像素电极(72a)移动,同时黄 色粒子(Y)向公共电极(71)移动。当黑色和黄色粒子因其彼此间强大的吸引力而相遇时,它们停止移动并且停留在公共电极与像素电极之间。低电荷(负) 白色粒子(W)一直向公共电极侧(即,观看侧)移动,并且低电荷(正)红 色粒子(R)向像素电极侧移动。结果是,白颜色可见。
也应注意到,图7B的7(c)和图7C的7(d)中,虽然施加的低驱动电压(﹢ lV或﹣lV)不足以分离强电荷的黑色和黄色粒子,但却足以分离低电荷强度的 两类相反带电的粒子,还能将低电荷粒子与带相反电荷极性的强电荷粒子分离 开。
应注意到,施加的低电压(﹢lV或﹣lV)的量级通常是驱动像素从黑色状 态到黄色状态(﹣hV)或者从黄色状态到黑色状态(﹢hV)所需的全驱动电压 量级的约5%到50%。在一个实施例中,﹢hV和﹣hV可以分别是﹢15V和﹣15V, 而﹢lV和﹣lV可以分别是﹢3V和﹣3V。此外,还应注意到,﹢hV和﹣hV的 量级可以相同也可以不同。同样,﹢lV和﹣lV的量级可以相同也可以不同。
图8a和8b示出了用于四类粒子系统的本发明驱动方法的初始步骤,并且 该步骤适用于全部像素。在第一阶段,对由全部像素共享的公共电极施加﹢hV, 同时全部像素电极为0V,这导致全部像素的驱动电压电位差为﹣hV,其驱动全 部像素到黄色状态。在第二阶段,﹣lV施加到公共电极,同时全部像素电极仍 保持0V,这导致驱动电压电位差为﹢lV,其驱动全部像素到红色状态。在此初始步骤中,全部像素电极保持在0V,同时公共电极被调制,从﹢hV到﹣V切 换。
如图4所述的振动波形也可以应用于此情况中。
图9示出了该驱动方法的下一步骤。在此步骤中,公共电极为0V接地,同 时不同电压施加到像素电极。对于停留在红色状态的像素,无电压施加到对应 的像素电极,这导致无驱动电压电位差。对于黑色状态中的像素,﹢hV施加到 对应的像素电极。对于黄色状态中的像素,﹣hV施加到对应的像素电极。对于 白色状态中的像素,将﹢hV随后﹣lV施加到相应的像素。
使用这种在初始步骤中调制公共电极的驱动方法,背板系统只需要在四个 不同电压等级0V、﹢hV、﹣hV和﹣lV各有一个像素电极即可,这比先前方法 中所用的背板系统更为简化,先前方法中的背板系统需要在五个不同电压等级 0V、﹢hV、﹣hV、﹢lV和﹣lV各有一个像素。
图11a是示出了本发明驱动方法执行过程的简化示意图。如图所示,有三 个不同电压等级0V、﹢hV和﹣lV,其可以施加到公共电极(Vcom),以及有 四个不同电压等级0V、﹢hV、﹣hV和﹣lV,其可以施加到像素电极。
图11b是示出了对应的现有技术方法的示意图。图中,有四个电压等级﹢ hV、﹣hV、﹢lV和﹣lV,其可以施加到像素电极。已商业化量产的TFT背板 通常只具有支持0V、﹢hV和﹣hV的源极IC。因而,与本发明驱动方法对比, 如果采用现有技术方法,则需要修改源极IC以支持施加到像素电极的额外电压 选项﹢lV。
如上述,在初始步骤中,全部像素被驱动到红色状态。不过,也可以在初 始步骤中将全部像素驱动到白色状态(通过保持像素电极接地,并且将﹣hV随 后﹢lV施加到公共电极),然后将像素从白到黑驱动到黑色(﹢hV),将像素从 白到黄驱动到黄色(﹣hV),并且对白色像素不施加驱动电压电位差以保持白色。 红色像素是从白到黄(﹣hV)然后从黄到红(﹢lV)进行驱动。在这种情况下, 背板系统只需要在四个不同电压等级0V、﹢hV、﹣hV和﹢lV各有一个像素电极即可。
图12a是示出了本发明驱动方法执行过程的简化示意图。如图所示,有三 个不同电压等级0V、﹣hV和﹢lV,其可以施加到公共电极(Vcom),以及有 四个不同电压等级0V、﹢hV、﹣hV和﹢lV,其可以施加到像素电极。
图12b是示出了对应的现有技术方法的示意图。图中,有四个电压等级﹢ hV、﹣hV、﹢lV和﹣lV,其可以施加到像素电极。已商业化量产的TFT背板 通常只具有支持0V、﹢hV和﹣hV的源极IC。因而,与本发明驱动方法对比, 如果采用现有技术方法,则需要修改源极IC以支持施加到像素电极的额外电压 选项﹣lV。
虽然已参照特定实施例对本发明进行了描述,但本领域技术人员应理解, 对此可做多种改变并且等同方案可以替代,这些均不违背本发明的实质精神和 范围。此外,还可以做许多修正以使得特定的条件、材料、成分、过程、工序 或步骤适应于本发明的目的和范围。上述所有变更均包含在后附权利要求范围 内。

Claims (8)

1.一种用于驱动一显示装置的背板系统,所述显示装置包括一电泳流体,该电泳流体包括第一类粒子、第二类粒子和第三类粒子,该三类粒子都分散于溶剂或溶剂混合物中,其中该第一类粒子携带一种电荷极性,同时该第二和第三类粒子携带相反的电荷极性;该背板系统仅有三个电压等级,0V、高正电压及高负电压。
2.如权利要求1所述的背板系统,其中所述第一类粒子带负电荷,而所述第二类和第三类粒子带正电荷。
3.如权利要求1所述的背板系统,其中所述第一类粒子为白色粒子,所述第二类粒子为黑色粒子,而所述第三类粒子为非白非黑粒子。
4.一种显示装置,包括:
根据权利要求1所述的背板系统,其仅有三个电压等级,0V、高正电压和高负电压;
电泳液层,包含第一类粒子、第二类粒子和第三类粒子,该三类粒子都分散于溶剂或溶剂混合物中,其中第一类粒子携带一种电荷极性,而同时该第二和第三类粒子携带相反的电荷极性;以及
公共电极设置在电泳流体层的与背板系统相对的一侧,公共电极具有三个电压等级,0V,具有与第一类粒子的电荷极性相反极性的高电压,和具有与第三类粒子的电荷极性相反极性的低电压。
5.一种用于驱动一显示装置的背板系统,该显示装置包括一电泳流体,该电泳流体包括第一类粒子、第二类粒子、第三类粒子和第四类粒子,该四类粒子都分散于溶剂或溶剂混合物中,其中该第一和第二类粒子所带电荷极性相反,并且该第三和第四类粒子所带电荷极性相反;该背板系统仅有四个电压等级,0V、高正电压、高负电压以及低正电压或者低负电压。
6.如权利要求5所述的背板系统,其中所述第一和第三类粒子带正电荷,而所述第二类和第四类粒子带负电荷。
7.如权利要求5所述的背板系统,其中所述第一类粒子为黑色粒子,所述第二类粒子为黄色粒子,所述第三类粒子为红色粒子,而所述第四类粒子为白色粒子。
8.如权利要求5所述的背板系统,其中所述第一类粒子为高正电粒子,所述第二类粒子为高负电粒子,所述第三类粒子为低正电粒子,所述第四类粒子为低负电粒子。
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