Studies of Electro-Optical characteristics of polymer-stabilized Chiral-Homeotropic Liquid Crystal Films

• Main Authors: Chia-Chi Tsai, 蔡佳琪
• Other Authors: Andy Ying-Guey Fuh
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/03820045188811328871

碩士 === 國立成功大學 === 物理學系碩博士班 === 92 === We study the Electro-Optical characteristics of polymer-stabilized Chiral-Homeotropic liquid Crystal Films. Various conditions to form polymer-networks are experimented. A Chiral-homeotropic cell becomes a TN cell under applying a suitable voltage. So, it is also called a reverse-TN mode. It presents a high contrast ratio and a good dark state like a VA cell, less color dispersion like a TN cell, but it possesses a drawback—slow response, because of the backflow effect incurred during the application of an external field. Experimental results obtained from our study show that the various types of polymer networks involved in the polymer-stabilized Chiral-Homeotropic liquid Crystal cell can reduce the backflow effect, and therefore, speed up the response time. The color dispersion caused by the polymer networks in a polymer-stabilized chiral-homeotropic liquid crystal cell is also experimented. The result shows that polymer networks result in an imperfect twisted nematic structure and it can not reach the Gooch-Tarry condition, so that the achromatic effect in the PSCHLC cell is not as good as a typical TN cell.