WO2013120396A1 - 双稳态液晶手写装置 - Google Patents

双稳态液晶手写装置 Download PDF

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Publication number
WO2013120396A1
WO2013120396A1 PCT/CN2013/000126 CN2013000126W WO2013120396A1 WO 2013120396 A1 WO2013120396 A1 WO 2013120396A1 CN 2013000126 W CN2013000126 W CN 2013000126W WO 2013120396 A1 WO2013120396 A1 WO 2013120396A1
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Prior art keywords
liquid crystal
layer
smectic
bistable liquid
handwriting device
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PCT/CN2013/000126
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English (en)
French (fr)
Inventor
宋晓龙
陈昭远
王盼盼
季飞
李鹏飞
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江苏和成显示科技股份有限公司
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Publication of WO2013120396A1 publication Critical patent/WO2013120396A1/zh

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00Liquid crystal materials
    • C09K19/02Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00Liquid crystal materials
    • C09K19/04Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06Non-steroidal liquid crystal compounds
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00Liquid crystal materials
    • C09K19/52Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54Additives having no specific mesophase characterised by their chemical composition
    • C09K19/542Macromolecular compounds
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412Digitisers structurally integrated in a display
    • 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
    • G02F1/13775Polymer-stabilized liquid crystal layers

Definitions

  • the present invention relates to a bistable liquid crystal handwriting device, and more particularly to a reusable bistable liquid crystal handwriting device that writes, displays, and deletes information using white or color fonts.
  • bistable liquid crystal displays have gradually become mainstream due to their extremely low power consumption.
  • the bi-stable display can maintain text or images for a long time without displaying energy after displaying text or images, until it is switched to the next content, so the energy consumption for long-term display is greatly saved.
  • bistable liquid crystal displays has mainly focused on cholesteric liquid crystal materials.
  • the cholesteric liquid crystal itself has several different states, including the vertical state of the parallel electric field of the liquid crystal molecules under the electric field, and the two steady states without the applied electric field: the planar state and the focal conic state.
  • the bistable characteristics of the cholesteric liquid crystal material both steady states can be stabilized without an applied electric field, respectively, showing a bright state or a dark state, and the display information is saved without an external power supply except the switching process.
  • it has the characteristics of reflecting external light without the need of a backlight and a polarizer, and thus is more energy-efficient than a general display.
  • the planar ffi liquid crystal reflects only a certain wavelength of light wave.
  • the reflection band is * ⁇ , where ⁇ is the birefringence of cholesteric liquid crystal, ⁇ is the pitch of the cholesteric liquid crystal spiral, and other bands Light penetrates through the liquid crystal layer and is absorbed by the bottom plate of the display. Since the reflection band of the cholesteric liquid crystal is only a part of the visible light band (400 ⁇ 750 nm), the reflected light is colored; in addition, the focal conic state of the cholesteric liquid crystal has the characteristics of translucent and semi-scattering, and the incident light of the outside is partially worn. It is absorbed by the black backing plate through the liquid crystal layer, and the other part is scattered by the focal conic state, thereby exhibiting a lighter milky white color.
  • the cholesteric liquid crystal forms a planar state under the action of external pressure and exhibits a bright state with a color (usually dark green), and is switched to a focal cone state after applying a voltage.
  • a dark state with a lighter milky white so the contrast is not high, and it is not beautiful.
  • the smectic A phase liquid crystal material is a liquid crystal material having two steady states and a focal conic state. When in the vertical state, the incident light can penetrate almost completely without being scattered, and when in the focal conic state, the incident Light is almost completely scattered and therefore has very good optical properties.
  • An aspect of the present invention provides a bistable liquid crystal handwriting device, wherein: the handwriting device includes a first base layer, a first conductive layer, a mixed layer, a second conductive layer, and a second base layer;
  • the mixed layer includes a smectic A phase liquid crystal and a polymer.
  • the first substrate layer is a glass or hard film layer
  • the second substrate layer is a glass or hard film layer
  • the hard film layer may be a transparent plastic film or a transparent plastic plate
  • the first conductive layer And the second conductive layer is a transparent electrode layer, and may be divided into a plurality of cells according to the needs of the display or erase pattern.
  • the mixed layer has a thickness of from 2 micrometers to 50 micrometers, and the smectic A phase liquid crystal comprises from 30% to 95% by weight of the total mixture, and the polymer comprises from 5 to 70% by weight based on the total weight of the mixture.
  • the smectic A phase liquid crystal is a liquid crystal monomer or liquid crystal monomer combination having a smectic A phase (Smectic A).
  • the refractive index of the polymer (the ordinary refractive index of the np smectic A phase liquid crystal (no) ⁇ 0.5.
  • the mixed layer further comprises a dichroic dye.
  • the bistable liquid crystal handwriting device also includes a top plate. In some embodiments, the top plate is over the first substrate layer and is a transparent single layer film or multilayer composite for providing enhanced optical effects. In some embodiments, The bistable liquid crystal handwriting device further includes a bottom plate.
  • the bottom plate is located below the second substrate layer, which is a glass, metal layer, plastic or multilayer composite material, and the plastic may be transparent, translucent or opaque, multi-layer
  • the composite material can provide enhanced optical effects, and the transmissive, reflective or transflective display effect can be achieved by using the bottom plate.
  • the bistable liquid crystal handwriting device is written on the unit area of the handwriting device. Applying a sufficiently large pressure to reduce the thickness of the mixed layer, and the smectic A-phase liquid crystal under the pressure point will be reoriented and transformed.
  • Focal conic state shown in Figure 1B, because the steady state is the focal conic state, the pressure disappears after remained in this state, thereby presenting the text white Word or pattern.
  • the bistable liquid crystal handwriting device of the present invention has selective pressure sensitivity. As shown in Fig. 4, only when the pressure (P) per unit area is greater than the critical pressure (Pc), the thickness of the mixed layer changes to produce a focal conic state. When P ⁇ Pc, the liquid crystal cannot be converted into a focal conic state, and the device does not respond to external pressure; when P>Pc, the liquid crystal changes to a focal conic state, and the device is sensitive to external pressure.
  • P critical pressure
  • FIG. 1A and FIG. 1B are schematic diagrams showing a vertical state and a focal conic state of a bistable smectic A phase liquid crystal;
  • FIG. 2 is a schematic cross-sectional view of a bistable liquid crystal handwriting device of the present invention
  • FIG. 3 is a schematic cross-sectional view of a bistable liquid crystal handwriting device including a top plate and a bottom plate according to the present invention
  • FIG. 2 is a pressure sensing diagram of the handwriting device.
  • the bistable liquid crystal writing device includes a first base layer, a first conductive layer, a mixed layer, a second conductive layer, and a second base layer laminated in this order.
  • the mixed layer is disposed between the first conductive layer and the second conductive layer.
  • the base layer and the conductive layer may be combined together, for example, commercially available indium tin oxide-polyester film (ITO-PET) is combined and sold as a commodity; the base layer and the conductive layer may also exist independently, respectively, using different Film substrate and conductive coating.
  • ITO-PET indium tin oxide-polyester film
  • the film substrate can be polyester (PET or PEN), polycarbonate (PC), cellulose triacetate (TAC), polypropylene (PP), polyethylene (PE), nylon ( Nylon), polyvinyl chloride (PVC), nitrocellulose (NC), aluminized film, polytetrafluoroethylene (PTFE), polyvinylidene chloride (PVDC), polyvinylidene chloride (PVDF), polyurethane ( Transparent or opaque materials such as PU) and polystyrene (PS), and conductive coatings can use indium tin oxide (ITO), conductive polymers, metals, alloys, carbon nanotubes (CNTs), and graphene. (Graphene) and other transparent or opaque materials.
  • the conductive coating may be uniformly distributed on the substrate layer by mechanical coating, chemical vapor deposition (CVD), sputter coating, electrochemical coating, or the like to form a thin film.
  • the mixed layer is composed of a smectic A phase liquid crystal and a polymer, and the smectic A phase liquid crystal means having a smectic A phase (Smectic)
  • the liquid crystal monomer or liquid crystal monomer combination of A) has two steady states of a vertical state and a focal conic state, and has an ordinary refractive index (no) and an extraordinary refractive index (ne;).
  • the smectic A phase liquid crystal and the polymer may be miscible at room temperature to form a mixture, and the mixture is uniformly "sandwiched" between the first conductive layer and the second conductive layer by coating, and has a certain thickness. Subsequently, under the action of light and heat, phase separation occurs between the smectic A phase liquid crystal and the polymer to form a fine structure, thereby supporting the pressure and restricting the flow of the liquid crystal.
  • the thickness of the mixed layer is from 2 ⁇ m to 50 ⁇ m, and can be controlled by a known method, for example, using a conventional gap controller, a photo-spacer or a precision coating method.
  • the mixed layer may also be mixed with a certain amount of dichroic dye, such as a red azo dichroic dye or the like.
  • the dichroic dye used in the present invention is a rod-shaped dichroic dye which is similar to the optical axis structure of the smectic A phase liquid crystal, and the dichroic dye is in the parallel direction along the long optical axis.
  • the bistable liquid crystal handwriting device of the present invention may further include a top plate or/and a bottom plate for achieving various optical effects and display effects.
  • the top plate is located above the first substrate layer and is a transparent single layer film or multilayer composite for providing enhanced optical effects such as glare elimination, increased brightness, improved contrast, and the like.
  • the bottom plate is located below the second substrate layer and is a glass, metal layer, plastic or multilayer composite material, the plastic may be transparent, translucent or opaque, and the multilayer composite material may provide enhanced optical effects such as increase Brightness, compensated viewing angle, or improved contrast can be achieved by using a backplane for transmissive, reflective or transflective display.
  • the bistable liquid crystal handwriting device of the present invention when writing, a sufficient pressure is applied to the unit area to reduce the thickness of the mixed layer, and the smectic A phase liquid crystal under the pressure point is reoriented to be converted into a focal conic state. As shown in Fig. 1B, since the focal conic state is a steady state, this state is maintained after the pressure disappears, thereby presenting white or colored characters or patterns.
  • the smectic A phase handwriting device of the present invention is selectively pressure sensitive. As shown in Fig. 4, only when the pressure (P) per unit area is greater than the critical pressure (Pc), the thickness of the mixed layer changes to produce a focal conic state. when! When ⁇ ? ⁇ , the liquid crystal cannot be converted into a focal conic state, and the device does not respond to external pressure; When >?0, the liquid crystal changes to a focal conic state, and the device is sensitive to external pressure.
  • a voltage is applied between the two conductive layers, and the smectic A phase liquid crystal is aligned parallel to the direction of the electric field to be converted into a vertical state, as shown in FIG.
  • Example 1 Two sheets of a 25 cm * 20 cm PET film having an indium tin oxide (yttrium) conductive film on one surface thereof were provided.
  • the composition of the mixture is 80% smectic A phase liquid crystal and 20% polymer, smectic A phase liquid crystal and polymer are produced by Jiangsu Hecheng Chemical Materials Co., Ltd., the models are HJC150600-000 and JH- 002. The mixture was stirred well at room temperature.
  • the mixture was coated in the middle of two PET sheets with ITO to control the thickness of the mixed layer to 10 ⁇ m.
  • Phase Separation After coating, the mixture was polymerized under UV light for 3 min, or baked in an oven at 70 ° C for 30 min to complete phase separation (Phase Separation).
  • phase separation After the phase separation is completed, it can be written to display white fonts and patterns.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Human Computer Interaction (AREA)
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Abstract

一种双稳态液晶手写装置,所述手写装置包括第一基体层、第一导电层、混合层、第二导电层以及第二基体层;其中,所述混合层包括近晶A相液晶和聚合物。混合层包括30~95%的近晶A相液晶和5~70%的聚合物。当用尖笔在手写装置的屏幕上书写时,设备会进行有选择性的压力响应。对手写装置加电后,能够将所写的内容擦除。该双稳态液晶手写装置具有对比度高、价格便宜、携带方便等特点,可以显示白色或彩色字体或图案,并且能够切割成任何形状。

Description

双稳态液晶手写装置
技术领域 本发明涉及一种双稳态液晶手写装置, 特别涉及一种使用白色或彩色字体书写、 显示 以及删除信息的可重复使用的双稳态液晶手写装置。 背景技术 在液晶显示器领域中, 双稳态液晶显示器因其极低的功耗而逐渐成为主流。双稳态显 示器在显示文字或图像后, 不需要能量的支持就可以长期保持文字或图像, 直到被切换至 下一个内容, 所以大幅度节省了长期显示所耗费的能源。 近年来, 双稳态液晶显示器的研究主要在于胆 液晶材料。胆 ¾液晶本身具有数个不 同的态, 包括电场下液晶分子平行电场的垂直态、 以及不需要外加电场的两个稳态: 平面 态与焦锥态。胆 液晶材料所具有的双稳态特性, 两个稳态都能在无外加电场的情况下保 持稳定,分别表现出亮态或者暗态,除切换的过程以外不需要外加电源即可保存显示信息; 另一方面, 具有不需要背光源及偏光片即可反射外界光线的特点, 因而较一般显示器更节 能。 处于平面态的胆 ffi液晶只反射某个波段的光波, 根据 Bragg反射原理, 其反射波段为 * Ρ, 其中 Δη是胆甾液晶的双折射率, Ρ是胆甾液晶螺旋的螺距, 其它波段的光 穿透过液晶层而被显示器的底板吸收。 由于胆 液晶的反射波段仅仅是可见光波段 (400~750nm)的一部分, 因此反射的光线是有颜色的; 另外, 胆甾液晶的焦锥态具有半透 明半散射的特点, 外界的入射光一部分穿透过液晶层而被黑色背板吸收, 另一部分被焦锥 态散射, 从而表现出较浅的乳白色。 这种显示模式被应用在美国专利 US2009033811中, 胆甾液晶在外界压力的作用下形成平面态而表现出带有颜色(通常是暗绿色) 的亮态, 施 加电压后切换至焦锥态而表现出带有较浅的乳白色的暗态,因此对比度不高,而且不美观。 近晶 A 相液晶材料是一种具有垂直态和焦锥态两个稳态的液晶材料, 当处于垂直态 时,入射光线可以几乎全部穿透而不被散射, 当处于焦锥态时,入射光线几乎全部被散射, 因此具有非常好的光学特性。 在目前巳知的技术中, 中国专利 CN101415280和美国专利 US2003112204 均采用了高频率和低频率的电压来分别切换两个稳态, 这增加了驱动芯片 的设计和制造的难度, 提髙了成本。 因此, 对于能够使用白色或彩色字体书写、 显示以及删除信息的可重复使用的双稳态 液晶手写装置, 存在巨大的需求。 发明内容 本发明的目的是提供一种双稳态液晶手写装置,克服以往双稳态液晶手写装置对比度 低以及字体亮度低的缺点。 本发明人通过研究发现,外界压力的作用可以引起近晶 A相液晶从垂直态转换至焦锥 态, 从而提供了一种双稳态液晶手写装置。 本发明的一个方面提供一种双稳态液晶手写装置, 其特征在于: 所述手写装置包括第 一基体层、 第一导电层、 混合层、 第二导电层以及第二基体层; 其中, 所述混合层包括近 晶 A相液晶和聚合物。 在一些实施方案中,第一基体层为玻璃或硬质膜层,第二基体层为玻璃或者硬质膜层, 所述硬质膜层可以为透明塑料薄膜或者透明塑料板;第一导电层和第二导电层为透明电极 层, 并且可以根据显示或擦除图案的需要被分割成若干单元。 在一些实施方案中, 混合层厚度为 2微米〜 50微米, 并且近晶 A相液晶占混合物总 重量的 30%〜95%, 聚合物占混合物总重量的 5〜70%。 在一些实施方案中, 近晶 A相液晶为具有近晶 A相 (Smectic A) 的液晶单体或液晶 单体组合。 在一些实施方案中, 聚合物的折射率 (np 近晶 A相液晶的寻常光折射率 (no)±0.5。 在一些实施方案中, 混合层还包括二色性染料。 在一些实施方案中, 双稳态液晶手写装置还包括顶板。 在一些实施方案中, 顶板位于第一基体层上方, 为透明的单层薄膜或多层复合材料, 用于提供增强的光学效果。 在一些实施方案中, 双稳态液晶手写装置还包括底板。 在一些实施方案中, 底板位于第二基体层下方, 为玻璃、 金属层、 塑料或者多层复合 材料, 塑料可以是透明、 半透明或不透明的, 多层复合材料可以提供增强的光学效果, 通 过使用底板可以达到透射式、 反射式或者半透射半反射式的显示效果。 本发明中双稳态液晶手写装置在写入时,在手写装置的单位面积上施加足够大的压力 使混合层的厚度减小, 受压点下方的近晶 A相液晶会重新取向而转变为焦锥态, 如图 1B 所示, 因为焦锥态是稳定状态, 所以压力消失后仍然保持着这个状态, 从而呈现白色的文 字或图案。 本发明中双稳态液晶手写装置具有选择性的压力敏感。 如图 4所示, 只有当单位面积 下的压力 (P) 大于临界压强 (Critical Pressure, Pc) 的条件下, 混合层的厚度才会发生改 变而产生焦锥态。当 P<Pc时,液晶不能转变为焦锥态,装置对外界压力没有响应;当 P>Pc 时, 液晶转变为焦锥态, 装置对外界压力敏感。 本发明中双稳态液晶手写装置在擦除时,在两个导电层中间施加电压,近晶 A相液晶 平行于电场方向排列而转变为垂直态, 如图 1A所示, 因为垂直态是稳定状态, 所以切断 电压后仍能保持垂直态, 从而消除了焦锥态所表现出的文字或图案。 本发明的优点是: 本发明提供的双稳态液晶手写装置具有对比度高、 价格便宜、 携带 方便等特点, 可以显示白色或彩色字体或图案, 并且能够切割成任何形状。 附图说明 图 1A与图 1B分别为双稳态近晶 A相液晶的垂直态与焦锥态的示意图;
图 2为本发明的双稳态液晶手写装置的剖面示意图;
图 3为本发明的包含顶板和底板的双稳态液晶手写装置的剖面示意图;
图 4为手写装置压力感应图。 具体实施方式 本发明中的双稳态液晶手写装置的示意性剖面图请参照图 2。 如图 2所示, 双稳态液晶手写装置包括依次叠层第一基体层、 第一导电层、 混合层、 第二导电层、 第二基体层。 其中, 混合层设置在第一导电层与第二导电层之间。 基体层和导电层可以合并在一起, 例如市售的氧化铟锡一聚酯薄膜 (ITO-PET) 是合 并在一起做为商品出售的; 基体层和导电层也可以独立存在, 分别使用不同的薄膜底材和 导电涂层,薄膜底材可以使用聚酯(PET或 PEN)、聚碳酸酯(PC)、三乙酸纤维素(TAC)、 聚丙烯 (PP)、 聚乙烯 (PE)、 尼龙 (Nylon)、 聚氯乙烯 (PVC)、 硝基纤维素 (NC)、 镀 铝薄膜、 聚四氟乙烯 (PTFE)、 聚偏二氯乙烯 (PVDC)、 聚偏二氯乙烯(PVDF)、 聚氨酯 (PU)、 聚苯乙烯 (PS ) 等透明或不透明的材料, 而导电涂层可以使用氧化铟锡 (ITO)、 导电高分子 (Conductive Polymer )、 金属、 合金、 碳纳米管 (CNT)、 石墨烯 (Graphene)等 透明或不透明的材料。 导电涂层可以通过机械涂布、 化学气相沉积 (CVD)、 溅射镀膜、 电化学镀膜等方法在基体层上均匀分布形成薄膜。 混合层由近晶 A相液晶和聚合物组成,所述近晶 A相液晶是指具有近晶 A相(Smectic A) 的液晶单体或液晶单体组合, 具有垂直态和焦锥态两个稳态, 具有寻常光折射率 (no) 和非寻常光折射率 (ne;)。所述聚合物是指其折射率 (np)和近晶 A相液晶的寻常光折射率 (no) 具备 np = no±0.5关系的聚合物。 近晶 A相液晶和聚合物可以在室温下混溶而形成混合物,此混合物通过涂布的方式被 均匀地 "夹在"第一导电层和第二导电层的中间, 并具有一定的厚度, 随后在光、 热的作 用下近晶 A相液晶和聚合物之间发生相分离而形成细微的结构,从而起到支撑压力、限制 液晶流动的作用。 混合层的厚度为 2微米〜 50微米, 可以通过公知的方法来控制, 例如使用普通的间 隙控制物 (spacer). 光聚合的间隙控制物 (Photo-spacer) 或者精密涂布的方式等。 所述的混合层还可以混合有一定量的二色性染料, 例如红色的偶氮类二色性染料等。 通过混合二色性染料, 可以使本发明的手写装置实现有色的字体和图案。本发明中使用的 二色性染料选用棒状的二色性染料,该二色性染料与近晶 A相液晶的光轴结构类似,在沿 长光轴的平行方向, 该二色性染料对光的吸收非常弱, 而在沿光长轴的垂直方向, 该二色 性染料分子会极大程度的吸收其特征波段的光线。 本发明的双稳态液晶手写装置, 如图 3 所示, 还可以包括顶板或 /和底板, 用于实现 各种的光学效果和显示效果。 所述顶板位于第一基体层上方, 为透明的单层薄膜或多层复合材料, 用于提供增强的 光学效果例如消除眩光、 增加亮度、 提高对比度等。 所述底板位于第二基体层下方, 为玻璃、 金属层、 塑料或者多层复合材料, 所述塑料 可以是透明、 半透明或不透明的, 所述多层复合材料可以提供增强的光学效果例如增加亮 度、 补偿视角或者提高对比度等, 通过使用底板可以达到透射式、 反射式或者半透射半反 射式的显示效果。 本发明中双稳态液晶手写装置在写入时,在单位面积上施加足够大的压力使混合层的 厚度减小, 受压点下方的近晶 A相液晶会重新取向而转变为焦锥态, 如图 1B所示, 因为 焦锥态是稳定状态, 所以压力消失后仍然保持着这个状态, 从而呈现白色或有色的文字或 图案。 本发明中近晶 A相手写装置具有选择性的压力敏感。如图 4所示,只有当单位面积下 的压力 (P) 大于临界压强 (Critical Pressure, Pc) 的条件下, 混合层的厚度才会发生改变 而产生焦锥态。 当!^?^时, 液晶不能转变为焦锥态, 装置对外界压力没有响应; 当?>?0 时, 液晶转变为焦锥态, 装置对外界压力敏感。 本发明中近晶 A相手写装置在擦除时, 在两个导电层中间施加电压, 近晶 A相液晶 平行于电场方向排列而转变为垂直态, 如图 1A所示, 因为垂直态是稳定状态, 所以切断 电压后仍能保持垂直态, 从而消除了焦锥态所表现出的文字或图案。所施加的电压和混合 层的厚度有关, 混合层的厚度越大, 所施加的电压越高, 本发明所使用的电压范围是 2V-220V, 直流和交流均可使用。 本发明所使用的液晶、 聚合物以及其他原料均为市售的商业原料。 下面通过实施例更详细的描述本发明, 但本发明不应被以下实施例所限制。 实施例 1 提供两片 25cm*20cm的 PET薄膜, 该 PET薄膜的一个表面上具有氧化铟锡 (ΠΌ) 导电膜。
称量 5g混合物, 混合物的组成是 80%近晶 A相液晶和 20%聚合物,近晶 A相液晶和 聚合物均为江苏和成化学材料有限公司生产, 型号分别是 HJC150600-000和 JH-002。 混 合物在室温下搅拌均匀。
将混合物均勾的涂布在两片有 ITO的 PET中间, 控制混合层的厚度 10微米。
涂布均勾后, 将混合物置于紫外灯下聚合 3min, 或者在 70°C的烘箱中烘烤 30min, 以完成相分离 (Phase Separation )。
相分离完成后即可以书写, 显示白色的字体和图案。
对 ITO-PET施加 80V 50Hz的交流电, 可以将写入的内容擦除。

Claims

权利要求
1.一种双稳态液晶手写装置, 其特征在于: 所述手写装置包括第一基体层、 第一导电 层、混合层、第二导电层以及第二基体层;其中,所述混合层包括近晶 A相液晶和聚合物。
2.根据权利要求 1所述的双稳态液晶手写装置, 其特征在于: 所述第一基体层为玻璃 或硬质膜层, 所述第二基体层为玻璃或者硬质膜层, 所述硬质膜层可以为透明塑料薄膜或 者透明塑料板; 所述第一导电层和所述第二导电层为透明电极层, 并且可以根据显示或擦 除图案的需要被分割成若干单元。
3.根据权利要求 1所述的双稳态液晶手写装置, 其特征在于: 所述混合层厚度为 2微 米〜 50微米, 并且所述近晶 A相液晶占所述混合物总重量的 30%〜95%, 所述聚合物占 所述混合物总重量的 5~70%。
4.根据权利要求 1〜3所述的双稳态液晶手写装置, 其特征在于: 所述近晶 A相液晶 为具有近晶 A相 (Smectic A) 的液晶单体或液晶单体组合。
5.根据权利要求 1〜4所述的双稳态液晶手写装置, 其特征在于: 所述聚合物的折射 率 (叩)=所述近晶 A相液晶的寻常光折射率 (no) ±0.5。
6.根据权利要求 1所述的双稳态液晶手写装置, 其特征在于: 所述混合层还包括二色 性染料。
7.根据权利要求 1所述的双稳态液晶手写装置, 其特征在于: 所述手写装置还包括顶 板。
8.根据权利要求 7所述的双稳态液晶手写装置, 其特征在于: 所述顶板位于所述第一 基体层上方, 为透明的单层薄膜或多层复合材料, 用于提供增强的光学效果。
9.根据权利要求 1所述的双稳态液晶手写装置, 其特征在于: 所述手写装置还包括底 板。
10.根据权利要求 9所述的双稳态液晶手写装置, 其特征在于: 所述底板位于所述第 二基体层下方, 为玻璃、 金属层、 塑料或者多层复合材料, 所述塑料可以是透明、 半透明 或不透明的, 所述多层复合材料可以提供增强的光学效果, 通过使用所述底板可以达到透 射式、 反射式或者半透射半反射式的显示效果。
PCT/CN2013/000126 2012-02-13 2013-02-07 双稳态液晶手写装置 WO2013120396A1 (zh)

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