Studies of electro-optical characteristic of liquid crystal-polymer composites doped with a high dielectric material

• Main Authors: Shing-Trong Wu, 吳欣璁
• Other Authors: Andy Ying-Guey Fuh
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/85966888886488379025

碩士 === 國立成功大學 === 物理學系 === 88 === Studies of electro-optical characteristic of liquid crystal-polymer composites doped with a high dielectric material Student： Shing-Trong Wu Advisor： Andy Ying-Guey Fuh Department of Physics, National Cheng Kung University, Tainan ,Taiwan 701, ROC Abstract We work with two kinds of liquid crystal-polymer composite films doped with a material having a high dielectric constant and study their electro-optical effects in this thesis. These include (1) Polymer-Dispersed Liquid Crystal Film (PDLC); (2) Polymer-Stablized Cholesteric Texture (PSCT). Experiments are divided into two parts as follow. (1). We use PDLC film to record holographic grating (HPDLC), then study the relationship between the first-order diffracted beam intensity of the gratings and the driving voltage . Our purpose is to lower the switching voltage of the grating. (2). We fabricate PSCT normal-mode films, then study the relationship between the transmission of the film and its driving voltage. Our purpose is to improve the performance of this display device. The results obtain from the studies of the films’ electro-optical characteristics show that both the PDLC and PSCT films doped with a material having a high dielectric constant have a lower driving (or switching) voltage. The cause of such a reduction is due to the modification of the polymer matrix with the addition of that material that enhances the polymerization rate of the film during curing.