WO2015010429A1 - 一种液晶显示面板的制备方法 - Google Patents

一种液晶显示面板的制备方法 Download PDF

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WO2015010429A1
WO2015010429A1 PCT/CN2013/089746 CN2013089746W WO2015010429A1 WO 2015010429 A1 WO2015010429 A1 WO 2015010429A1 CN 2013089746 W CN2013089746 W CN 2013089746W WO 2015010429 A1 WO2015010429 A1 WO 2015010429A1
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liquid crystal
substrates
preparation
prepolymer
display panel
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PCT/CN2013/089746
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English (en)
French (fr)
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王新星
柳在健
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京东方科技集团股份有限公司
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Publication of WO2015010429A1 publication Critical patent/WO2015010429A1/zh

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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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1334Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • 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
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1334Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • G02F1/13345Network or three-dimensional gels

Definitions

  • the present invention relates to the field of liquid crystal display technology, and more particularly to a method for preparing a liquid crystal display panel.
  • Polymer Dispersed Liquid Crystal is a liquid crystal (liquid crystal, abbreviated as LC) mixed with a prepolymer, and polymerized under certain conditions to form micron-sized liquid crystal droplets uniformly. Dispersed in the polymer network, and then using the dielectric anisotropy of the liquid crystal molecules to obtain a material having electro-optical response characteristics, it is possible to realize a dark state in a bright state and a power-off state in an energized state.
  • FIG. 1 is a schematic view showing the distribution of phases of a prior art prepolymer and liquid crystal molecules before polymerization.
  • a mixture i of a prepolymer and a liquid crystal molecule is located between the upper substrate 2 and the lower substrate 3, and the photoinitiator 4 is distributed in the prepolymer and the liquid crystal.
  • the prior art PDLC generally uses a photopolymerization polymerization method to polymerize the prepolymer
  • FIG. 2 is a prior art process for polymerizing PDLC.
  • the ultraviolet light 5 illuminates the upper substrate 2
  • the polymer molecular chain 6 exhibits a random coil shape in the system, and the irregular coils enclose the liquid crystal molecules 7, and the mutual interaction between the two
  • the effect is large, and the liquid crystal rigid molecules are distributed in the flexible medium, so that the interface between the two has higher energy, which limits the movement ability of the liquid crystal molecules in the state of transformation, and the response of the PDLC is slow.
  • the prepolymer is polymerized by applying a voltage.
  • the voltage causes the liquid crystal molecules 7 to be vertically aligned, but at this time, the prepolymer forms a crosslinked network structure, The encapsulation of the liquid crystal molecules 7 is still strong, and the response speed is still very slow.
  • the object of the present invention is to provide a method for preparing a liquid crystal display panel, which is used to solve the problem that the liquid crystal molecules in the PDLC have a slow response speed after the voltage is applied in the prior art liquid crystal display panel.
  • the invention provides a method for preparing a liquid crystal display panel, wherein the liquid crystal display panel comprises two pieces a substrate, a polymer dispersed liquid crystal layer, and a transparent conductive layer, wherein the preparation method comprises: forming the transparent conductive layer on the two substrates respectively;
  • the two substrates are vertically irradiated with an ultraviolet light beam, and a voltage is applied to the two substrates through the transparent conductive layer to form an electric field between the two substrates, and the prepolymer reacts to form a polymer, thereby forming a
  • the polymer disperses the liquid crystal layer.
  • Ultraviolet light is formed by a mask having a plurality of micropores arranged in an array:
  • the preparation method described above wherein the ultraviolet light beam has a diameter of 0.01 to 10 ⁇ m.
  • the preparation method described above wherein The diameter is from 0.1 to i microns.
  • the ultraviolet light beam has an irradiation intensity of 5 mW per square centimeter to 10 mW per square centimeter.
  • the voltage applied by the two substrates is 30 volts to 40 volts.
  • An epoxy resin material, and the prepolymer comprises from thirty to forty percent of the total weight of the mixture.
  • the preparation method described above wherein a photoinitiator is further added to the mixture of the prepolymer and the liquid crystal, wherein the photoinitiator accounts for one percent of the total weight of the mixture to Three percent.
  • the preparation method described above wherein the photoinitiator is one or more selected from the group consisting of hydroxycyclohexyl phenyl ketone and 2-hydroxy 2-methyl-1-phenyl small acetone.
  • the photoinitiator is one or more selected from the group consisting of hydroxycyclohexyl phenyl ketone and 2-hydroxy 2-methyl-1-phenyl small acetone.
  • the preparation method uses a method in which a voltage is applied simultaneously with an ultraviolet light beam irradiation to coexist the prepolymer, and optimally, the prepolymer and the liquid crystal molecule are irradiated by forming a plurality of micrometer-level ultraviolet beams.
  • the mixed system causes ordered orientation polymerization in the mixed system to form a polymer fiber network structure in the system.
  • the liquid crystal molecules are oriented parallel to the fiber surface due to the lowest energy law, so the fiber network structure perpendicular to the direction of the two substrates will The resistance of the liquid crystal molecules moving in the direction perpendicular to the two substrates is reduced, and the driving force required to align the liquid crystal molecules to the direction perpendicular to the two substrates is reduced, the speed of the movement is increased, and the response time is reduced.
  • Figure 1 is a schematic view showing the distribution of phases of prepolymer and liquid crystal molecules before polymerization
  • Fig. 2 is a view showing the distribution of phases of the prior art which is prepared by using only light irradiation when the PDLC is polymerized;
  • FIG. 3 is a schematic view showing the distribution of each phase when the PDLC is polymerized by the pressure control in the prior art
  • FIG. 4 is a schematic view showing the application structure of the preparation method according to the specific embodiment of the present invention
  • Figure 5 is a view showing the distribution of phases of the prepolymer and the liquid crystal molecules under pressure
  • Fig. 6 is a view showing the orientation tendency of liquid crystal molecules on the surface of a polymer fiber.
  • a liquid crystal display panel includes two substrates disposed opposite to each other, and a polymer dispersed liquid crystal layer disposed between the two substrates, wherein the two substrates are oriented.
  • a transparent conductive layer is formed on one surface of the polymer dispersed liquid crystal layer, wherein the preparation method comprises:
  • the two substrates are vertically irradiated with an ultraviolet light beam, and a voltage is applied to the two substrates through the transparent conductive layer to form an electric field between the two substrates, and the prepolymer reacts to form a polymer. Thereby a polymer dispersed liquid crystal layer is formed.
  • the prepolymer is polymerized by a method of simultaneously applying a voltage and an ultraviolet beam irradiation, and the prepolymer is combined by the ultraviolet light beam and the applied voltage.
  • the material forms a cross-linked network structure, and the driving force required for the liquid crystal molecules to be aligned perpendicularly to the two substrates is reduced, so that the response speed of the liquid crystal molecules in the PDLC of the liquid crystal display panel is accelerated.
  • a mask having a plurality of micropores arranged in an array is used to cause ultraviolet light to form a plurality of ultraviolet beams for vertically illuminating the two substrates.
  • the diameter of the ultraviolet light beam is on the order of microns.
  • the preparation method mainly includes the following steps:
  • a transparent conductive layer may be formed on each of the first substrate 10 and the second substrate 11 by various methods such as deposition, coating, and sputtering.
  • the two substrates that is, the first substrate 10 and the second substrate 11 may be made of a transparent material such as glass, quartz or resin, which is not limited herein; the material of the transparent conductive layer may be selected from indium tin oxide ( Indmm Tin Oxide, ⁇ ), Indium Zin Oxide (IZO), Indium Gallium Zinc Oxide (IGZO) and other transparent materials.
  • the first substrate 10 and the second substrate 11 are processed in a pair of boxes, and the first substrate 10 is opposed to the conductive layer on the second substrate II, and pre-polymerization is disposed between the first substrate 10 and the second substrate 11. a mixture of liquid crystal molecules 7;
  • the two substrates may be first set on the box to form a liquid crystal cell, so as to form a transparent
  • the surfaces of the two substrates of the conductive layer are opposite, and then a mixture of the prepolymer and the liquid crystal is injected into the liquid crystal cell; or a mixture of the prepolymer and the liquid crystal may be instilled in one of the substrates to form a transparent conductive
  • the surface of the layer is then placed on the two substrates.
  • the first substrate 10 and the second substrate 11 are vertically irradiated by the ultraviolet light beams, respectively, and passed through the first substrate! 0 and the transparent conductive layer on the second substrate 11 respectively on the first substrate! 0 with the second substrate! 1 Apply a voltage to the first substrate 10 and the second substrate! An electric field is formed between 1 so that the prepolymer reacts under the action of the ultraviolet beam and the electric field to form the polymer 8, thereby forming a polymer dispersed liquid crystal layer.
  • FIG. 5 is a schematic view showing the distribution of each phase of the prepolymer 6 and the liquid crystal molecules 7 under a voltage application state. Referring to FIG. 5, the prepolymer 6 and the liquid crystal molecules 7 are uniformly mixed under the action of an electric field. And oriented perpendicular to the direction of the two substrates.
  • a mask having a plurality of micropores arranged in an array is disposed on the outer sides of the first substrate 10 and the second substrate 11, respectively, that is, as shown in FIG. a first mask 12 and a second mask 13 are formed on the first mask 12 with a plurality of first micro holes 121, and a plurality of second micro holes 131 are formed in the second mask 13
  • the ultraviolet light passing through the first mask 12 and the second mask 13 forms a plurality of minute ultraviolet beams for vertically illuminating the first substrate 10 and the second substrate 11, respectively.
  • the first mask 12 and the second mask 13 only transmit light at the first microhole 121 and the second microwell 131, respectively, to form a very thin light column, which is triggered.
  • the reaction while the liquid crystal molecules 7 are oriented perpendicular to the two substrates under the action of the electric field, and the molecular chains of the prepolymer 6 close to the first substrate 10 and the second substrate 11 will be along the cause of the resistance of the light source and the liquid crystal molecules 7 Similar to the vertical orientation polymerization, a polymer fiber network structure is formed. According to the principle of minimum energy, the liquid crystal molecules 7 tend to be oriented parallel on the surface of the polymer fiber 15, as shown in Fig.
  • the ultraviolet light beam has a diameter of 0.01 ⁇ m to 10 and most preferably 0 ⁇ m to 1 ⁇ m.
  • the ultraviolet light beam has an illumination intensity of 5 milliwatts per square centimeter to 10 milliwatts per square Square centimeter, irradiation time is 10 to 20 minutes.
  • the preparation of the first micropores 121 on the first mask 12 and the preparation of the second microwells 131 on the second mask 13 may be performed by any of the following methods:
  • a first mask 12 and a second mask 13 on the surface of the plexiglass through a microporous screen coated printing anti-ultraviolet glue (polyurethane base glue, fluorosilicone base glue);
  • the first mask 12 and the second mask 13 are provided.
  • the voltage applied to the transparent conductive layer on the first substrate 10 and the second substrate 11 should be 30 volts to 40 volts.
  • the prepolymer is an acrylate material or an epoxy resin material.
  • the prepolymer comprises from ten to forty percent of the total weight of the mixture.
  • a photoinitiator is further added to the mixed system of the prepolymer and the liquid crystal molecules to make the polymerization of the prepolymer faster and more uniform.
  • the photoinitiator comprises from one to three percent of the total weight of the mixture.
  • the photoinitiator is selected from the group consisting of hydroxycyclohexyl phenyl ketone (HCPKJ or 2-hydroxy-2-methyl-I-phenyl-1-propanone (HMPP), etc., suitable for acrylate or epoxy resin
  • HCPKJ hydroxycyclohexyl phenyl ketone
  • HMPP 2-hydroxy-2-methyl-I-phenyl-1-propanone
  • One or more of the initiators of the system is selected from the group consisting of hydroxycyclohexyl phenyl ketone
  • HMPP 2-hydroxy-2-methyl-I-phenyl-1-propanone
  • the light irradiation unit for forming a plurality of micron-order ultraviolet light beams is not limited to being formed into the above-described structure, and a structure form in which a micron-order ultraviolet light beam is emitted directly through the illuminator may be employed.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Dispersion Chemistry (AREA)
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Abstract

一种液晶显示面板的制备方法,所述液晶显示面板包括两块基板、聚合物分散液晶层和透明导电层,所述制备方法包括:在两块基板上分别形成透明导电层;对两块基板进行对盒处理,形成液晶盒,在液晶盒中,两块基板的形成有所述透明导电层的表面相对,所述两块基板之间设置有预聚物和液晶的混合物;采用紫外光束垂直照射所述两块基板,并通过所述透明导电层对所述两块基板施加电压,在两块基板之间形成电场,所述预聚物反应形成聚合物,从而形成聚合物分散液晶层。本方法能够解决现有技术液晶显示面板在施加电压之后,PDLC中液晶分子响应速度慢的问题。

Description

一种液晶显示面板的制备方法 本发明涉及液晶显示技术领域,尤其是指一种液晶显示面板的制备方法。 聚合物分散液晶 (PDLC, Polymer Dispersed Liquid Crystal:) 是将低分子 液晶(liquid crystal, 缩写为 LC)与预聚物相混合, 在一定条件下经聚合反应, 形成微米级的液晶微滴均匀地分散在高分子网络中, 再利用液晶分子的介电 各向异性获得具有电光响应特性的材料, 可以实现在通电状态下的亮态与断 电状态下的暗态。
图 1为现有技术预聚物与液晶分子聚合前各相分布示意图, 预聚物与液 晶分子的混合物 i位于上基板 2与下基板 3之间, 光引发剂 4分布于预聚物 与液晶分子的混合物 1 中, 其中预聚物与液晶分子两相的状态为均匀不分相 现有技术 PDLC—般采用光聚合的聚合方式使预聚物实现聚合, 图 2为 现有技术使 PDLC聚合时仅采用光照射实现制备的结构示意图, 紫外光 5照 射上基板 2, 聚合物分子链 6在体系中呈现无规则线团状, 无规则线团包裹 着液晶分子 7, 两者之间的相互作用较大, 液晶刚性分子分布在柔性介质中, 使得两者之间的界面作用具有较高的能量, 限制了液晶分子在变换状态时的 运动能力, 造成 PDLC的响应很慢。
此外, 现有技术 PDLC的制备过程, 也有通过施加电压的方式使预聚物 实现聚合, 如图 3所示, 电压使液晶分子 7垂直排列, 但此时预聚物形成交 联网络结构, 对液晶分子 7的包裹作用仍然很强, 响应速度依然很慢。 根据 以上, 因此如何将聚合物与液晶分子之间的柔性包裹转化为刚性接触将是解 决 PDLC中液晶分子响应速度的关键。 本发明技术方案的目的是提供一种液晶显示面板的制备方法, 用于解决 现有技术液晶显示面板在施加电压之后, PDLC 中液晶分子响应速度慢的问 题。
本发明提供一种液晶显示面板的制备方法, 所述液晶显示面板包括两块 基板、 聚合物分散液晶层和透明导电层, 其中, 所述制备方法包括: 在所述两块基板上分别形成所述透明导电层;
对所述两块基板进行对盒处理, 形成液晶盒, 在所述液晶盒中, 所述两 块基板的形成有所述透明导电层的表面相对, 所述两块基板之间设置有预聚 物和液晶的混合物;
采用紫外光束垂直照射所述两块基板, 并通过所述透明导电层对所述两 块基板施加电压, 在两块基板之间形成电场, 所述预聚物反应形成聚合物, 认而形成所述聚合物分散液晶层。
优选地, 上述所述的制备方法, 其中, 所述采用紫外光束垂直照射所述 两块基板包括:
通过具有阵列排布多个微孔的掩膜板, 使得紫外光形成:
^于垂直照射所述两块基板。
优选地, 上述所述的制备方法, 其中,
Figure imgf000004_0001
优选地, 上述所述的制备方法, 其中, 所述紫外光束的直径为 0.01 至 10微米。
优选地, 上述所述的制备方法, 其中,
Figure imgf000004_0002
的直径为 0.1 至 i微米。
优选地, 上述所述的制备方法, 其中, 所述紫外光束的照射强度为 5毫 瓦每平方厘米至 10毫瓦每平方厘米。
优选地, 上述所述的制备方法, 其中, έ两块基板施加的电压为 30 伏至 40伏。
优选地, 上述所述的制备方法, 其中 所述预? κ
环氧树酯材料, 且所述预聚物占所述混合物的总重量的百分之三十至百分之 四十。
优选地, 上述所述的制备方法, 其中, 所述预聚物与所述液晶的混合物 中还添加有光引发剂, 其中所述光引发剂占所述混合物的总重量的百分之一 至百分之三。
优选地, 上述所述的制备方法, 其中, 所述光引发剂选自羟基环己基苯 基甲酮、 2羟基 2-甲基- 1-苯基小丙酮中的一种或多种。 本发明的上述技术方案具有以下有益效果:
所述制备方法采用同时施加电压与紫外光束照射两种控制方式并存的方 法使预聚物实现聚合, 最佳地, 通过形成多个微米级别的紫外光束照射所述 预聚物与所述液晶分子的混合体系, 使混合体系内发生有序取向聚合, 在体 系中形成聚合物纤维网络结构, 液晶分子由于能量最低规律在纤维表面平行 取向, 因此垂直于两块基板方向上的纤维网络结构将会降低液晶分子向垂直 于两块基板方向运动的阻力, 当施加电压日寸液晶分子转向垂直于两块基板方 向排列所需要的驱动力降低, 运动的速度加快, 响应日寸间减小。
附图说明
图 1表示预聚物与液晶分子聚合前各相分布示意图;
图 2表示现有技术使 PDLC聚合时仅采用光照射实现制备的各相分布示 意图;
图 3表示现有技术采用加压控制使 PDLC聚合时的各相分布示意图; 图 4表示本发明具体实施例所述制备方法的应用结构示意图;
图 5表示预聚物与液晶分子在加压状态下的各相分布示意图;
图 6表示液晶分子在聚合物纤维表面的取向趋势示意图。
具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合^图及具体 实施例对本发明进行详细描述。
本发明具体实施例提供的液晶显示面板的制备方法, 所述液晶显示面板 包括相对设置的两块基板、 以及设置于所述两块基板之间的聚合物分散液晶 层, 所述两块基板朝向所述聚合物分散液晶层的一面形成有透明导电层, 其 中, 所述制备方法包括:
在两块基板上分别形成透明导电层;
对所述两块基板进行对盒处理, 形成液晶盒, 在所述液晶盒中, 所述两 块基板的形成有所述透明导电层的表面相对, 所述两块基板之间设置有预聚 物和液晶的混合物;
采用紫外光束垂直照射所述两块基板, 并通过所述透明导电层对所述两 块基板施加电压, 在两块基板之间形成电场, 所述预聚物反应形成聚合物, 从而形成聚合物分散液晶层。
本发明具体实施例所述液晶显示面板的制备方法, 采用同时施加电压与 紫外光束照射两种控制方式并存的方法使预聚物实现聚合, 在紫外光束与所 加电压的共同作用下, 预聚物形成交联网络结构, 液晶分子转向垂直于两块 基板方向排列所需要的驱动力降低, 认而使得液晶显示面板的 PDLC中液晶 分子响应速度加快。
最佳地, 利用具有阵列排布多个微孔的掩膜板, 使得紫外光形成多个紫 外光束, 用于垂直照射所述两块基板。
优选地, 所述紫外光束的直径为微米级别。
通过形成多个微米级别的紫外光束照射所述预聚物与所述液晶分子的混 合体系, 使混合体系内发生有序取向聚合, 同时对聚合体系施加垂直于两块 基板的电场, 使聚合反应在液晶垂直状态取向聚合, 两者 ^同作用得到聚合 物纤维网络结构, 液晶分子在这一结构表面倾向于平行排列, 因此液晶转向 垂直于两块基板方向的阻力减小, 响应速度快, 从而解决现有技术 PDLC响 应速度慢的问题。
图 4为本发明具体实施例所述制备方法的应用结构示意图。 所述制备方 法的目的是在两块基板之间形成聚合物分散液晶层, 以构成为液晶显示面板。 结合图 4, 所述制备方法主要包括以下几个歩骤:
在第一基板 10与第二基板 11上分别形成透明导电层;
具体地, 可以采 ^沉积、 涂敷、 溅射等多种方式, 在第一基板 10与第二 基板 11上分别形成透明导电层。 所述两块基板即所述第一基板 10与第二基 板 11可以采用玻璃、 石英、 树脂等透明材料制成, 在此不做限定; 所述透明 导电层的材料可以选自氧化铟锡(Indmm Tin Oxide, ΠΌ)、氧化铟锌(Indium Zin Oxide, IZO)、 氧化铟镓锌 (Indium Gallium Zinc Oxide, IGZO) 等透明材 料制成。
将第一基板 10与第二基板 11迸行对盒处理,并使第一基板 10与第二基 板 II上的导电层相对, 以及在第一基板 10与第二基板 11之间设置有预聚物 禾口液晶分子 7的混合物;
具体可选地, 可以先将所述两块基板对盒设置形成液晶盒, 使形成有透 明导电层的所述两块基板的表面相对, 然后将预聚物和液晶的混合物注入所 述液晶盒; 也可以先将预聚物和液晶的混合物滴注在其中一块基板的形成有 透明导电层的表面, 然后使两块基板对盒。
采用紫外光束分别垂直照射第一基板 10与第二基板 11, 并通过第一基 板!0与第二基板 11上的透明导电层分别对第一基板!0与第二基板!1施加 电压, 使第一基板 10与第二基板!1之间形成电场, 使得预聚物在紫外光束 和电场的同时作用下反应形成聚合物 8, 从而形成聚合物分散液晶层。
如图 5所示为用于表示预聚物 6与液晶分子 7在加电压状态下的各相分 布示意图, 参阅图 5所示, 在电场作用下, 预聚物 6与液晶分子 7均匀混合, 且呈垂直于两块基板方向取向。
最佳地, 本发明具体实施例所述制备方法, 还在第一基板 10与第二基板 11的外侧分别通过设置具有阵列排布多个微孔的掩膜板, 也即图 4所示的第 一掩膜板 12和第二掩膜板 13 , 第一掩膜板 12上形成有多个第一微孔 121 , 第二掩膜板 13上形成有多个第二微孔 131 , 使得透过第一掩膜板 12和第二 掩膜板 13 的紫外光形成多个微小的紫外光束, 分别用于垂直照射第一基板 10和第二基板 11。
采用本发明具体实施例上述结构的制备方法,第一掩膜板 12和第二掩膜 板 13只是分别在第一微孔 121和第二微孔 131处透射光线,形成极细的光柱, 引发反应, 同时液晶分子 7在电场的作用下垂直于两块基板取向, 靠近第一 基板 10和第二基板 11的预聚物 6的分子链, 由于光源以及液晶分子 7阻力 的原因, 将会沿着类似垂直方向取向聚合, 形成聚合物纤维网络状结构, 根 据能量最低原则, 液晶分子 7倾向于在聚合物纤维 15表面平行取向, 如图 6 所示, 因此液晶分子 7在断电无规则排列状态下有垂直于两块基板取向的趋 势, 因此当施加电场 H寸, 液晶分子 7向垂直于两块基板方向运动的运动阻力 减小, 响应速度变快, 制备得到一种快速响应的 PDLC:。
本发明具体实施例所述制备方法,所述紫外光束的直径为 0.01微米至 10 最佳地为 0,1微米至 1微米。
且优选地,所述紫外光束的照射强度为 5毫瓦每平方厘米至 10毫瓦每平 方厘米, 照射时间为 10至 20分钟。
此外, 第一掩膜板 12上所述第一微孔 121 的制备, 以及第二掩膜板 13 上所述第二微孔 131的制备可以采用以下几种方法的任一种:
1 ) 在带有多个微孔的塑料纸 (蜡纸) 上印刷抗紫外胶 (聚氨酯基体胶、 氟硅基体胶等) 制成第一掩膜板 12和第二掩膜板 13 ;
2)采用在微米级别针头在印刷抗紫外胶的塑料纸表面进行间隔扎孔的方 式制成第一掩膜板 12和第二掩膜板 13 ;
3 )在有机玻璃表面通过有微孔的丝网涂布印刷抗紫外胶(聚氨酯基体胶、 氟硅基体胶) 制成第一掩膜板 12和第二掩膜板 13 ;
4)在形成有遮光材料(例如金属铬)层的有机玻璃表面, 采用激光烧蚀 或者构图工艺 (通常包括光刻胶涂敷、 曝光、 显影、 刻蚀、 光刻胶剥离等工 艺) 制成第一掩膜板 12和第二掩膜板 13。 本发明具体实施例所述制备方法, 第一基板 10与第二基板 11上透明导电层所施加的电压应该为 30伏至 40伏。
优选地, 所述预聚物为丙烯酸酯材料或者环氧树酯材料。 所述预聚物占 所述混合物的总重量的百分之 十至百分之四十。
优选地, 在所述预聚物与所述液晶分子的混合体系中还添加有光引发 剂, 以使预聚物的聚合反应更快更均匀。 其中所述光引发剂占所述混合物 的总重量的百分之一至百分之三。
且优选地,所述光引发剂选自羟基环己基苯基甲酮(HCPKJ或 2-羟基- 2- 甲基— I—苯基— 1—丙酮 (HMPP ) 等适用于丙烯酸酯或者环氧树脂体系的引发剂 中的一种或多种。 通过所述制备方法制得的液晶显示面板, 其中 PDLC的驱 动电压小于 20伏, 大大缩短了液晶分子的响应时间。
所述制备方法中, 用于形成多个微米级紫外光束的光照射单元并不限于 形成为上述结构, 也可以采 ^直接通过发光器发射出微米级紫外光束的结构 形式等。
本发明具体实施例所述制备方法, 通过形成多个微米级别的紫外光束照 射所述预聚物与所述液晶分子的混合体系,使混合体系内发生有序取向聚合, 在体系中形成聚合物纤维网络结构, 液晶分子由于能量最低规律在纤维表面 平行取向, 因此垂直于两块基板方向上的纤维网络结构将会降低液晶分子向 垂直于两块基板方向运动的阻力, 当施加电压时液晶分子转向垂直于两块基 板方向所需要的驱动力降低, 运动的速度加快, 响应日寸间减小。
以上所述仅是本发明的优选实施方式, 应当指出, 对于本技术领域的普 通技术人员来说, 在不脱离本发明原理的前提下, 还可以做出若千改进和润 饰, 这些改进和润饰也应视为本发明的保护范围。

Claims

1, 一种液晶显示面板的制备方法, 所述液晶显示面板包括两块基板、 聚 合物分散液晶层和透明导电层, 其特征在于, 所述制备方法包括:
在所述两块基板上分别形成所述透明导电层;
对所述两块基板进行对盒处理, 形成液晶盒, 在所述液晶盒中, 所述两 块基板的形成有所述透明导电层的表面相对, 所述两块基板之间设置有预聚 物和液晶的混合物;
采用紫外光束垂直照射所述两块基板, 并通过所述透明导电层对所述两 块基板施加电压, 在两块基板之间形成电场, 所述预聚物反应形成聚合物, 从而形成所述聚合物分散液晶层。
2, 如权利要求 1所述的制备方法, 其特征在于, 所述采用紫外光束垂直 照射所述两块基板包括:
通过具有阵列排布多个微孔的掩膜板, 使得紫外光形成多个紫外光束, 用于垂直照射所述两块基板。
3, 如权利要求 1或 2所述的制备方法, 其特征在于, 所述紫外光束的直 径为微米级别。
4, 如权利要求 3所述的制备方法, 其特征在于, 所述紫外光束的直径为 0.01微米至 10微米。
5, 如权利要求 4所述的制备方法, 其特征在于, 所述紫外光束的直径为 ( 微米至 1微米。
6, 如权利要求 1或 2所述的制备方法, 其特征在于, 所述紫外光束的照 射强度为 5毫瓦每平方厘米至 10毫瓦每平方厘米。
7, 如权利要求 1或 2所述的制备方法, 其特征在于, 对所述两块基板施 加的电压为 30伏至 40伏。
8, 如权利要求 1所述的制备方法, 其特征在于, 所述预聚物为丙烯酸酯 材料或者环氧树酯材料, 且所述预聚物占所述混合物的总重量的百分之≡十 至百分之四十。
9, 如权利要求 1所述的制备方法, 其特征在于, 所述预聚物与所述液晶 的混合物中还添加有光引发剂, 其中所述光引发剂占所述混合物的总重量的 百分之一至百分之三。
10. 如权利要求 9所述的制备方法, 其特征在于, 所述光引发剂选自羟 基环己基苯基甲酮、 2羟基 甲基 苯基 丙酮中的一种或多种。
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