CN1549951A - 可擦除的双稳态显示器 - Google Patents

可擦除的双稳态显示器 Download PDF

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CN1549951A
CN1549951A CNA028169158A CN02816915A CN1549951A CN 1549951 A CN1549951 A CN 1549951A CN A028169158 A CNA028169158 A CN A028169158A CN 02816915 A CN02816915 A CN 02816915A CN 1549951 A CN1549951 A CN 1549951A
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expanding chamber
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CN1311285C (zh
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Pa
P·A·西克勒
P��������˹̹
P·C·P·布坦
ά
P·J·斯里科维尔
G·尼萨托
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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
    • G02F1/137Devices 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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • 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
    • G02F1/137Devices 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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13718Devices 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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
    • 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
    • G02F1/13306Circuit arrangements or driving methods for the control of single liquid crystal cells

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  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种双稳态液晶显示器器件,可以通过在该显示器的部分20处施加机械压力P而加以擦除。该压力引起液晶(5)材料流进膨胀室(22)内。该被引发的流动导致从非反射状态转变到反射状态,因此消除了对高电压的擦除电压的需求。

Description

可擦除的双稳态显示器
本发明包括一种液晶显示器器件,其可在第一光学模式和第二光学模式之间加以转换,该显示器器件具有第一部分,并且可以通过对该第一部分施加压力来擦除显示屏的至少一部分。
一种双稳态液晶显示器器件在JP-2000127683中公开。该显示器应用在电子白板。白板在会议期间使用以便在上面写下信息。随后,该信息被扫描并且可以被打印。聚合物稳定胆甾相结构型(PSCT)液晶显示器(LCD)应用于在其上可以写的板的部分。PSCT显示器可在反射和透射模式之间转换。JP-2000127683公开了在这样的显示器上显示的信息可以通过利用例如笔施加的外部机械压力加以擦除。由于这种机械压力而引起在液晶流体内的转变,结果是透射状态(模式)局部转变成反射状态(模式)。利用这个现象来擦除该器件上显示的信息。因为压力是局部地施加的,所以擦除效果也局部发生,因此,仅仅一小部分显示器被擦除。
本发明的一个目的是提供一种显示器器件,其中可以通过机械压力擦除在更大区域上、甚至是在整个显示区域上显示的信息。本发明的显示器器件的特征在于,该器件具有膨胀室(expansion chamber),用于存储由施加的压力引起的流进膨胀室内的过多流体,因此该流体流动擦除在显示器器件的第二部分内的显示器上显示的信息,该第二部分位于第一部分和膨胀室之间。本发明人已经认识到,如果调节显示器器件以使得发生液晶材料的流动,则这种流动可以被有利地用于擦除整个显示区域。由于存在膨胀室,将发生从压力点到膨胀室的液晶材料流动,并且剪应力将作用于液晶。液晶材料在发生流体流动的显示器的整个区域上面以平面(反射)状态变得有序,即发生从透射到反射模式的相转变,因此擦除了被显示的信息。结果不再要求高的擦除电压。
本发明的这个方面以及其它方面由独立权利要求来限定。
本发明的有优势的实施例通过从属权利要求来限定。
在下面,本发明的这些方面以及其它方面将通过参考附图来说明。
在附图中,
图1A和1B分别示出了可在透射状态和反射状态之间转换的双稳态液晶显示器器件的剖面图,
图2是根据本发明的显示器器件的实施例的剖面图,和
图3示出了根据本发明的显示设备。
这些附图没有按比例画出。一般地,图中的相同元件由相同的参考标号表示。
图1A和1B示出了双稳态液晶显示器器件的剖面图。该器件包括两个基板1和3,在这两个基板之间放置胆甾相结构液晶(CTLC)材料5。该基板1和3的内表面7和9具有透明导电材料以便形成两组电极。该器件还包括距离元件(distance element)或隔离物11以便使这两个基板彼此之间保持定义好的距离。通过在电极7和9上施加电压,CTLC材料5可以在图1A中所示的透射状态和图1B中所示的反射状态之间切换。基于CTLC的显示器要求相对高的转换电压,典型的是至少30V,因此也要求相对昂贵的驱动IC。此外,当低(电池)电压变换为这样的高电压电平时,会损失能量。
图2示出了根据本发明的显示器器件的实施例的剖面图。该显示器包括可以在上面显示信息的第二部分24,可以在上面施加机械压力P的第一部分20,以及膨胀室22。CTLC材料5安置在基板1和3之间。该器件还包括距离元件11以便使基板保持定义好的距离,典型的保持在5微米的量级上。通过施加一定的电压,该显示器能够从反射状态转换到透射状态。照这样,液晶材料从平面变化到所谓的焦点圆锥形状态(focal conic state)。施加较高电压可以将该显示器从非反射状态转换到反射状态。这是因为焦点圆锥形(非反射)状态变化成所谓的垂直(homeotropic)状态,其在去掉电压之后松驰至平面(反射)状态。通常,不是仅单一电压之外,而是一定的脉冲序列用于驱动该显示器。这是很有优势的,例如加速驱动以及防止显示材料质量变差。典型的器件可以以高于10V的电压被从反射状态驱动到非反射状态,以及以高于大约34V的电压被从非反射状态驱动到反射状态。这些电压相对较高,并且能够通过减小单元间隙而得以降低。然而,单元间隙的减小是通过减小反射状态的反射率来实现的。这又降低了显示性能,即显示器的亮度和对比度。
本发明人已经认识到,如果剪应力作用于液晶,则从非反射到反射状态的转变同样发生。使液晶流动的剪应力是通过作用在显示器上的机械压力P而引起的。施加的压力具有这样的优势,即不再要求用于擦除显示的高电压。
在具有刚性基板的显示器中,必须给该显示器施加很大的力,因此优选使用柔性基板,即将具有<200微米厚度的塑料基板用作显示器的至少一部分。基板的柔软性用弯曲半径可以表达得最好,弯曲半径是基板厚度和所使用的基板材料的杨氏(弹性)模量这二者的函数。该基板可以被弹性地弯曲至这一半径。使用具有100cm或更小的弯曲半径的基板曾获得过好的结果。
和用在第二部分24中的隔离物的密度相比较,通过在这些部分内使用更少的隔离物11,可以提高第一部分20和膨胀室22的柔软性,并由此改善液晶流体流动的发生。这也提高了显示部分24的硬度,因此由于改善了流向膨胀室22的流体流体,结果就改善了擦除效果。显示部分24内的隔离物优选被固定到两个基板1和3,因为这将防止隔离物的任何位移,并因此在基板1和3之间将确保一个恒定距离。这种隔离物可以用光刻工艺来制得。附加的措施是在显示区域24中使用肋状隔离物。这具有增强从压力部分20到膨胀室22的流动的优点。
根据在其间能够转换显示的结构的稳定性,CTLC显示器可以有两种类型:聚合物稳定(PSCT)或表面稳定(SSCT)。已经发现,液晶的稳定性类型对擦除效果起作用。在聚合物稳定CTLC(PSCT)中,该聚合物网络妨碍了液晶的自由流动。因此优选使用表面稳定的CTLC。
已经在其中展示了效果的显示器的实例具有5微米的球形隔离物,密度是100/mm2,分布在具有1.6GPa杨氏模量和200微米厚度的两个塑料基板之间。
图3示出了根据本发明的显示设备,包括根据本发明的显示器器件和用于给显示器器件提供控制信号32和显示信号34的装置30。
总之,本发明包括双稳态液晶显示器器件,可以通过施加机械压力P而加以擦除。该压力引起液晶5的材料流向膨胀室22。该被引发的流动导致从非反射状态转变到反射状态,因此消除了对高电压的擦除电压需求。
应该注意,上述的实施例是说明本发明而不是限制本发明,本领域的技术人员在不脱离附属权利要求的范围内可以设计多个替换的实施例。在这些权利要求中,在括号中的任何参考符号将不构成对这些权利要求的限制。词语“包括”不排除存在权利要求所列之外的其它元件或步骤。元件前面的单词“一个”不排除存在多个这样的元件。

Claims (6)

1.一种液晶显示器器件,它可在第一光学模式和第二光学模式之间加以转换,
该显示器器件包括第一部分(20)并且,可以通过对该第一部分施加压力P而擦除该显示器器件的至少一部分,
其中该显示器器件提供有膨胀室(22),用于存储通过施加的压力P而引起流进膨胀室的过多液晶流体,
该流体流动因此擦除在该显示器的第二部分(24)内的显示器上显示的信息,该第二部分位于第一部分(20)和膨胀室(22)之间。
2.根据权利要求1所述的显示器器件,其中第一光学模式包括透明模式,第二光学模式包括反射模式。
3.根据权利要求1所述的显示器器件,其中该显示器包括具有100cm或更小的弯曲半径的基板(1,3)。
4.根据权利要求1所述的显示器器件,其中第一部分(20)、第二部分(24)和膨胀室(22)包括具有各自密度的距离元件(11),在膨胀室(22)和/或在第一部分(20)内的距离元件的密度等于或小于在第二部分(24)内的距离元件的密度。
5.根据权利要求1所述的显示器器件,其中液晶(5)包括表面稳定胆甾相结构液晶(CTLC)。
6.一种显示设备,包括:
根据权利要求1所述的显示器器件;和
用于给显示器器件提供控制信号(32)和显示信号(34)的装置(30)。
CNB028169158A 2001-08-29 2002-07-15 可擦除的双稳态显示器 Expired - Fee Related CN1311285C (zh)

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KR20040044498A (ko) 2004-05-28
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KR100868112B1 (ko) 2008-11-10
US20030043317A1 (en) 2003-03-06
WO2003019277A1 (en) 2003-03-06
CN1311285C (zh) 2007-04-18
EP1421436A1 (en) 2004-05-26
EP1421436B1 (en) 2006-09-13

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