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52.2: High‐Speed Bend Transition Method using Electrical Twist Field in OCB Mode TFT‐LCDs
Author(s) -
Nakao Kenji,
Suzuki Daiichi,
Kojima Tetsuya,
Tsukane Midori,
Wakemoto Hirofumi
Publication year - 2004
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1821357
Subject(s) - twist , electric field , materials science , fréedericksz transition , nucleation , optics , liquid crystal display , liquid crystal , condensed matter physics , diagonal , optoelectronics , geometry , physics , thermodynamics , mathematics , quantum mechanics
We have developed high‐speed bend transition method of OCB (Optically Compensated Bend) mode TFT‐LCDs. We found out that nucleation of bend transition occurs with twist alignment. New pixel structure and driving scheme generate bend domains using “electrical twist field” which is lateral electric field to induce twist orientation of liquid crystal. The probability of bend nucleation depends on lateral twist and vertical transition electric field, and slightly depends on temperature. Growth speed of bend domain depends on the vertical transition voltage and viscosity of the liquid crystal. Bend transition time is mainly determined by the growth speed. A lower viscosity liquid crystal and a high transition voltage are preferable to achieve the high‐speed bend transition especially at low temperature. We have developed 22 inch diagonal HDTV which achieved the bend transition time to be less than 0.2 sec even at 0°C