Title :
A high contrast and high brightness reflective LCD with an internal diffusive reflector
Author :
Ting, Dai-Liang ; Liu, Chung-Yuan ; Shiu, Jyh-Wen ; Chang, Wei-Chih ; Wei, Hung-Ta ; Wen, Chi-Jain
Author_Institution :
Electron. Res. & Service Org., Ind. Technol. Res. Inst., Hsinchu, Taiwan
Abstract :
We have developed a high contrast and high brightness reflective LCD with an internal diffusive reflector (IDR). The IDR is used in a single-polarizer configuration using mixed-mode twisted nematic (MTN) effect. The diffusive reflector, with proper design, is effective in yielding a bright reflective-image under collimated ambient light. The MTN mode is adopted for its high contrast and large tolerance to cell gap variation. The test cell shows contrast ratio over 40:1, response time less than 20 ms and reflectivity of 22% (when combined with micro color filters) relative to a Lambertian standard white, measured at display´s normal direction under -30° collimated illumination
Keywords :
brightness; colour displays; liquid crystal displays; nematic liquid crystals; optical polarisers; reflectivity; bright reflective-image; cell gap variation tolerance; collimated ambient light; contrast ratio; full-color display; high brightness; high contrast; internal diffusive reflector; micro color filters; mixed-mode twisted nematic effect; quarter wave retardation film; reflective LCD; reflectivity; response time; single-polarizer configuration; uniform viewing angle; Brightness; Delay; Filters; Liquid crystal displays; Measurement standards; Optical collimators; Optical films; Reflectivity; Testing; Time measurement;
Conference_Titel :
Information Display, 1999. ASID '99. Proceedings of the 5th Asian Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
957-97347-9-8
DOI :
10.1109/ASID.1999.762709
