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（LC）组成的复合材料是用于制备电光器件（例如显示器和电控光快门）的有前途的材料，生产复合材料的一种实用方法是通过光聚合诱导初始混溶溶液的相分离。聚合物前体、交联剂液晶的性能很大程度上取决于聚合物网络和液晶域的最终形态，形态由相分离过程中的热力学和动力学决定。在该研究中，制备了由乙烯基醚共聚物和液晶组成的新型复合材料，以开发用于通过简单的多重电极寻址的大面积柔性显示器。通过单体的光聚合诱导聚合物和液晶的双连续相分离。由于光传输-电压曲线的陡度不够，传统（聚合物/LC）复合材料的复用能力较差。陡度方面，对于传统（聚合物/L 复合材料），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，对于通过优化单体组分、光照射温度、光照射强度等，制备新型（乙烯基醚共聚物/LCs）复合材料V_<80>/V_5的大小范围为1.25至1.35，在8的多重水平下可以提供30-70的光学对比度。基于光散射特性、介电特性、形态流变学、聚合动力学和相分离动力学发生旋节线分解或粘弹性相分离成富聚合物和富聚合物之间的时间。富含液晶的 PH 和（单体/液晶）混合物溶液光聚合过程中聚合物网络的发展是控制电光性能的主要因素。