CN105093765A - 一种电控聚合物稳定蓝相液晶聚合过程的方法及其器件 - Google Patents

一种电控聚合物稳定蓝相液晶聚合过程的方法及其器件 Download PDF

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CN105093765A
CN105093765A CN201510530171.XA CN201510530171A CN105093765A CN 105093765 A CN105093765 A CN 105093765A CN 201510530171 A CN201510530171 A CN 201510530171A CN 105093765 A CN105093765 A CN 105093765A
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李伟欢
陆建钢
胡德春
俞哲伟
刘诗雨
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Shanghai Jiaotong University
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Abstract

本发明公开了一种通过电控聚合过程降低蓝相液晶器件驱动电压的方法，蓝相液晶器件包括上基板，下基板，蓝相液晶层，电极层，其中电极层位于下基板和蓝相液晶层之间，用于施加电压控制聚合过程。通过在紫外光聚合过程中施加聚合电压，聚合电场降低聚合物网络的锚定能，能有效降低聚合物稳定蓝相液晶的驱动电压；同时，较低的聚合电场可以使蓝相液晶晶格产生均匀的取向，减少散射引起的漏光现象，从而提高蓝相液晶器件的对比度。本发明能有效降低蓝相液晶器件的驱动电压，也可以提高蓝相液晶器件的对比度，方法简单，成本低廉，适合大规模推广。

Description

一种电控聚合物稳定蓝相液晶聚合过程的方法及其器件
技术领域
本发明涉及液晶显示领域，涉及通过聚合电场控制聚合物稳定蓝相液晶的聚合过程，实现低驱动电压蓝相液晶的方法。
背景技术
近几年来，蓝相液晶由于其拥有亚毫秒级的响应时间，无需配向处理，无外加电场时呈光学各向同性，以及在可见光波段呈周期性三维螺旋结构等特点，蓝相液晶在场序列显示、相位调制器、三维可调光子晶体等方向的潜在应用吸引了很多人的目光。虽然蓝相液晶狭窄的温宽已经通过固化聚合物网络中的向错线被拓宽到了超过60K，但其他的一些问题，诸如高驱动电压、磁滞效应以及残留双折射等都限制了蓝相液晶的广泛应用。目前降低蓝相液晶器件的驱动电压通常有两种方法。一种是通过改善材料特性以提升其驱动性能，另一种方法是通过优化器件结构来增加有效电场；但是这两种方法存在其他问题比如复杂的器件设计，蓝相液晶其他参数变差等，无法应用到大规模的商业生产。
因此，本领域的技术人员致力于开发一种降低蓝相液晶器件驱动电压的方法及其器件,能有效降低蓝相液晶器件的驱动电压，也可以提高蓝相液晶器件的对比度
发明内容
有鉴于现有技术的上述缺陷，本发明所要解决的技术问题如何有效降低蓝相液晶器件的驱动电压。
为实现上述目的，本发明提供了一种电控聚合物稳定蓝相液晶聚合过程的方法，包括下列步骤：
步骤一，将蓝相液晶灌入所述液晶盒，并降温至聚合温度；
步骤二，聚合电场加到IPS电极层两端；
步骤三，在紫外线下聚合；
步骤四，得到电控聚合过程的聚合物稳定蓝相液晶。
进一步地，所述降温速率为0.5℃/min。
进一步地，所述聚合电场为0～1V/μm。
进一步地，所述聚合电场的频率为1kHz～1000kHz。
本发明还提供了一种基于电控聚合过程的蓝相液晶器件，包括上基板、下基板、蓝相液晶层和电极层，所述电极层在所述下基板与液晶层之间，在曝光聚合物蓝相液晶时，聚合电场施加在所述电极层上。
进一步地，所述上基板和下基板为玻璃或塑料。
进一步地，所述电极层是透明导电金属氧化物或透明导电有机高分子材料。
进一步地，所述电极层结构为一组互相平行的条状电极或上下电极。
进一步地，所述聚合电场为一组不同幅值，不同频率的方波、正弦波、三角波交流信号。
进一步地，所述透明导电金属氧化物为ITO，所述透明导电有机高分子材料为PEDOT。
本发明旨在提供一种简单的方法降低蓝相液晶的驱动电压，同时保持蓝相液晶的其他参数不变差。为实现上述目的，本发明提出一种电控聚合物稳定蓝相液晶聚合过程的方法。在对蓝相液晶聚合物混合物进行紫外线聚合时，一个聚合电压施加到液晶盒电极层上。
本发明通过以下技术方案实现的：
将蓝相液晶灌入所述液晶盒，并降温至聚合温度，聚合电压加到IPS电极层两端，在紫外线下聚合10分钟，得到电控聚合过程的聚合物稳定蓝相液晶。聚合电场范围为0～1V/μm，频率范围为1kHz～1000kHz，所加聚合电场降低聚合物网络的锚定能，起到降低蓝相液晶驱动电压的作用。随着聚合电场的增大，聚合物稳定蓝相液晶器件的驱动电压降低，在低聚合电场下，蓝相液晶器件的对比度得到很大提升，在高聚合电场下，高频率的聚合电场可以同时提高蓝相液晶的Kerr常数和对比度。
本发明提出的电场控制聚合过程降低聚合物稳定蓝相液晶驱动电压的方法简单，通过聚合时外加聚合电场，降低蓝相液晶的驱动电压，同时可以提升蓝相液晶对比度。
以下将结合附图对本发明的构思、具体结构及产生的技术效果作进一步说明，以充分地了解本发明的目的、特征和效果。
附图说明
图1是依照本发明的电控聚合过程方法的示意图；
图2是本发明的实施例，不同聚合电压下的电压-透过率曲线图；
图3是本发明的实施例，不同聚合电压下的Kerr常数和对比度图；
图4是本发明的实施例，不同频率下的电压-透过率曲线图。
具体实施方式
图1所示为液晶盒结构和本发明的截面图。主要有下基板1，Pixel和Common电极层2，蓝相液晶层3，上基板4，紫外线曝光5。
首先将蓝相液晶聚合物的混合物在各项同性状态下灌入到图1所示的液晶盒中，蓝相液晶均匀分散在蓝相层3中；在温控台上控制样品以0.5℃每分钟的速率降温，在显微镜下观察蓝相范围并降温至聚合温度。
在对蓝相液晶聚合物混合物聚合时，将聚合电压加到电极层中，然后将样品放到紫外线光源正下方曝光，通过Pixel电极和Common电极之间的电场降低聚合物网络的锚定能，从而提高Kerr常数和降低蓝相液晶驱动电压。不同的蓝相液晶材料，聚合时所需要的聚合电场会有所不同。
图2为本发明的实施例在电场频率为1kHz时的电压-透过率曲线图。当有外加聚合电场时，电极间的电场可以减少聚合物的锚定能，增大Kerr常数和降低蓝相液晶驱动电压；当聚合电压为20V，等效聚合电场为0.92V/μm，本实施例的驱动电压与传统聚合方式相比，要降低17％。
图3为本发明的实施例在电场频率为1kHz时的Kerr常数和对比度图。当聚合电压为20V，等效聚合电场为0.92V/μm，本实施例的蓝相液晶的Kerr常数与传统聚合方式相比，要提高45％。同时，聚合电压为4V，等效聚合电场为0.18V/μm蓝相液晶的对比度与传统聚合方式相比被提高7.6倍。
图4为本发明的实施例，聚合电压为8V，等效聚合电场为0.37V/μm时的不同频率下的电压-透过率曲线图。高频率的聚合电压可以同时提高Kerr常数和获得高对比度的蓝相液晶器件。聚合电场为0.37V/μm，500kHz时，蓝相液晶的Kerr常数与传统聚合方式相比，提高15％，同时，对比度也得到了提升，提高了4倍。
本发明利用电场控制聚合过程，提高蓝相液晶的Kerr常数，降低蓝相液晶驱动电压，降低磁滞；同时，在低聚合电压的情况下，蓝相液晶器件的对比度得到很大提升；高频率下的聚合电压可以同时降低蓝相液晶器件电压和提高对比度。以上详细描述了本发明的较佳具体实施例。应当理解，本领域的普通技术无需创造性劳动就可以根据本发明的构思作出诸多修改和变化。因此，凡本技术领域中技术人员依本发明的构思在现有技术的基础上通过逻辑分析、推理或者有限的实验可以得到的技术方案，皆应在由权利要求书所确定的保护范围内。

Claims (10)

1.一种电控聚合物稳定蓝相液晶聚合过程的方法，其特征在于，包括下列步骤：
步骤一，将蓝相液晶灌入所述液晶盒，并降温至聚合温度；
步骤二，聚合电场加到IPS电极层两端；
步骤三，在紫外线下聚合；
步骤四，得到电控聚合过程的聚合物稳定蓝相液晶。
2.如权利要求1所述的电控聚合物稳定蓝相液晶聚合过程的方法，其特征在于，所述降温速率为0.5℃/min。
3.如权利要求1所述的电控聚合物稳定蓝相液晶聚合过程的方法，其特征在于，所述聚合电场为0～1V/μm。
4.如权利要求1所述的电控聚合物稳定蓝相液晶聚合过程的方法，其特征在于，所述聚合电场的频率为1kHz～1000kHz。
5.一种如权利要求1～4任一基于电控聚合过程的蓝相液晶器件，其特征在于，包括上基板、下基板、蓝相液晶层和电极层，所述电极层在所述下基板与液晶层之间，在曝光聚合物蓝相液晶时，聚合电场施加在所述电极层上。
6.如权利要求5所述的蓝相液晶器件，其特征在于，所述上基板和下基板为玻璃或塑料。
7.如权利要求5所述的蓝相液晶器件，其特征在于，所述电极层是透明导电金属氧化物或透明导电有机高分子材料。
8.如权利要求5所述的蓝相液晶器件，其特征在于，所述电极层结构为一组互相平行的条状电极或上下电极。
9.如权利要求5所述的蓝相液晶器件，其特征在于，所述聚合电场为一组不同幅值，不同频率的方波、正弦波、三角波交流信号。
10.如权利要求7所述的蓝相液晶器件，其特征在于，所述透明导电金属氧化物为ITO，所述透明导电有机高分子材料为PEDOT。
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