Electro-Optical Properties of Stratified Polymer/Liquid-Crystal Composite Films

• Main Authors: Yi-Sheng Lu, 呂易昇
• Other Authors: Wei Lee
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/72455722947010991137

碩士 === 中原大學 === 應用物理研究所 === 95 === In recent years industrial technologies are approaching to maturity, leading to the development in the next-generation display�oflexible display�oby numerous companies and research institutes. The flexible display is characterized by lightweight, thinness and shock-resistance, and suitable for various mobile products. It can be manufactured by a continuous roll-to-roll process and is flexible, thereby opening up a wide spectrum of new applications in displays. Phase-separated polymer/liquid-crystal composite devices are one of the types developed recently that can be applied to flexible liquid-crystal displays. Its basic principle lies in the formation of vertical supports due to imperfect stratification during the manufacturing process. Based on our years’ experience in the laboratory, carbon nanomaterials are added in the liquid crystal to form phase-separated composite films for characterization by electro-optical measurements. Polymer-stabilized liquid crystals also rely on their internal polymer networks to stabilize the bulk structures and, in turn, to sustain the electro-optical performance under a bending stress. In this thesis we combine these two structures for a new study of electro-optical properties. The present thesis reveals the following results: first, as the literature indicates, the polymer/ liquid-crystal composite films exhibit a reduced response time; second, the operation voltage of the composite film at a high frequency is greater than that at a low frequency; third, carbon nanotubes added in the composite film shorten the liquid-crystal relaxation time and raise the contrast ratio; fourth, stratified polymer-stabilized liquid-crystal structure can also decrease the relaxation time.