High Transmittance Blue-Phase Liquid Crystal Display with Interdigitated Electrode

• Main Authors: Shih-Hsien Wei, 魏仕賢
• Other Authors: Wing-Kit Choi
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/97687055937731010659

碩士 === 國立臺灣大學 === 光電工程學研究所 === 104 === In recent years, liquid crystal display (LCD) has become an indispensable part of our life, such as TV, smart phone, smart watch, tablet, billboard and so on. People put a lot of money and human resource into research. Recently, a material has been developed and is called “Polymer Stabilized Blue Phase Liquid Crystal (PS-BPLC)”. Blue phase liquid crystal (BPLC) has several advantages, such as sub-millionsecond response time, no alignment required and isotropic dark state (wide viewing angle) and so on. When we put BPLC into display, it can solve image sticking problem, save manufacturing cost, etc. The major difficulties of BPLC LCDs are that their operating voltage is rather too high and transmittance is relatively low, that’s why BPLC LCD hasn’t been mass produced by companies yet. Researchers are devoted to developing new electrode structures that can lower the operating voltage and also increase the transmittance. In this thesis, we propose two new designs that are based on interdigitated electrode to further improve the transmittance and lower the operation voltage of BPLC. In the first design, we use interdigitated corrugated electrode structure to improve the transmittance in the sharp corner positions with less disclination lines. In the second design, we use interdigitated FIS (Fringe-In-Plane Switching) mode to improve the transmission and lower operating voltage of BPLC. In this thesis, we also design PSBP transflective LCDs that can be used in wearable devices. We focus mainly on single-cell-gap transflective LCDs since double-cell-gap transflective LCDs may sometimes be more complicated and hence require higher cost in the manufacturing process. However, the electro-optic curves (transmission vs. voltage and reflection vs. voltage) are more difficult to match in single cell gap transflective LCDs. In this thesis, we will try to different parameters to adjust the reflection curves to match the transmission curves.