title: Simple method to obtain accurate pretilt angles for thin twisted nematic liquid-crystal cells.
abstract: Modern thin-film-transistor-driven twisted nematic (TN) products on the market require thin cell gaps below the value to satisfy the condition of the Gooch-Tarry first minimum in transmission for fast response times and wide viewing angles. For the first time to our knowledge, we have developed a simple experimental method based on a new configuration of out-of-plane cell rotation and analyzed our data by extended Jones matrix method to obtain accurate pretilt angles for such thin TN cells where the well-accepted configuration of the out-of-plane cell rotation method analyzed by Birecki and Kahn [The Physics and Chemistry of Liquid Crystal Devices (1980), p. 115] was insufficient to address.
authors: Institute of Photonic Systems, National Chiao Tung University, No. 301, Gaofa 3rd Rd., Guiren Dist., Tainan City 711, Taiwan. shengyawang@gmail.com
authors: Sheng-Ya
authors: SY
authors: Wang
authors: Kei-Hsiung
authors: KH
authors: Yang
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D050866:Liquid Crystals / Q000737:chemistry*; D008422:Materials Testing; D008956:Models, Chemical; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods*; D014173:Transistors, Electronic