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Development of Flexible and Large area Liquid Crystal Display Devices

柔性大面积液晶显示器件的开发

基本信息

批准号：
12793005
负责人：
KIKUCHI Hirotsugu
金额：
$ 23.49万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for University and Society Collaboration
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

Composite materials consisting of polymers and low molecular weight liquid crystals (LCs) are promising materials for preparation of electro-optical devices such as displays and electrically controllable light shutters. A practical method of producing composites is by photopolymerization induced phase separation of an initially miscible solution of polymer precursor, crosslinker LCs. The performance of the composites strongly depends on the final morphology of the polymer network and the LC domains. The morphology is determined by both thermodynamics and kinetics of phase separation during the preparation processes. In this stud novel composite materials consisting of vinyl ether copolymers and LCs were prepared to develop a large-area and flexible display for addressing by simple multiplex electrodes.A bicontinuous phase separation of polymer and LCs was induced by photopolymerization of monomers solved in L Conventional (polymer/LC) composites have been poor in the multiplexing capab … More ility because of insufficient steepness of the opti transmission-electric voltage curve. A typical magnitude of steepness, V_<80>/V_5 is larger than 1.4 for conventional (polymer/L composites, where V_<80> and V_5 are 80 % transmittance voltage and 5 % transmittance voltage, respectively. In contrast, an extrem steep response was achieved for novel (vinyl ether copolymer/LCs) composites by optimizing the monomer component, the phcirradiation temperature the photo-irradiation intensity and so on. The magnitude of V_<80>/V_5 ranged 1.25 to 1.35 which can give optical contrast ratio of 30-70 at the multiplex level of 8. The mechanism of the electro-optical response was investigated based light scattering characteristics, dielectric properties, morphology rheology, polymerization kinetics and phase-separation kinetics. The timing between the occurrence of the spinodal decomposition or the viscoelastic phase separation into polymer rich and LCs-rich pha and the development of polymer network during photopolymerization of (monomers/LCs) mixture solution was a dominant factor control the electro-optical properties. Less

由聚合物和低分子量液晶组成的复合材料是制备显示器和电控百叶窗等光电器件的重要材料。一种生产复合材料的实用方法是将聚合物前驱体交联剂LCs的初始混相溶液进行光聚合诱导相分离。复合材料的性能在很大程度上取决于聚合物网络和LC畴的最终形态。形貌由制备过程中相分离的热力学和动力学共同决定。本研究制备了乙烯醚共聚物和lc组成的新型复合材料，以开发用于简单多路电极寻址的大面积柔性显示器。传统的聚合物/LC复合材料由于其最优传输电压曲线的陡峭度不够，其多路复用能力较差。典型的陡度值V_<80>/V_5大于1.4，其中V_<80>和V_5分别为80%透射率电压和5%透射率电压。相比之下，通过优化单体组分、循环辐射温度、光照射强度等因素，新型乙烯醚共聚物/ lc复合材料的响应速度非常快。V_<80>/V_5等的范围为1.25 ~ 1.35，在8的复用电平下，光学对比度为30 ~ 70。基于光散射特性、介电性质、形态流变学、聚合动力学和相分离动力学研究了其电光响应机理。单体/ lc混合溶液光聚合过程中，单体分解或粘弹性相分离形成富聚合物和富LCs的时间与聚合物网络形成的时间是控制其电光性能的主要因素。少