Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Patent
1997-12-22
1999-12-21
Sikes, William L.
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
349 42, 349177, 345 92, G02F 1133, G02F 1139, G09G 336
Patent
active
060056460
ABSTRACT:
A voltage application driving method is provided for quickly changing the alignment of a liquid crystal layer in thin film transistor liquid crystal displays (TFT/LCD) to a bend alignment. In this driving method, a potential difference larger than 10 V is continuously or intermittently provided between the signal electrode of the liquid crystal cells, and the counter electrode of the display while maintaining the potential difference between the gate electrode and the signal electrode of the cells larger than 10 V. The on-time over which an intermittent potential difference is provided between the signal electrode and the counter electrode is preferably equal to or longer than the time period for part of the liquid crystal layer to effectively begin a transition to the second-stage splay alignment, and the off-time over which no potential difference is provided between the signal electrode and the counter electrode is equal to or longer than the time period necessary for the liquid crystal region of of the second-stage splay alignment to return to its state before the voltage application.
REFERENCES:
"A bipolar addressing scheme for a thin film transistor liquid crystal display": Xerox Disclosure Journal, vol. 7, #5, Sep. 1982, XP002062420.
Luo Fang-Chen et al: "Performance of thin film . . . display circuits", IEEE Transactions on Electron Devices, vol. ED-30, #3, Mar. 1983, XP002062421, pp. 202-206.
Bryer et al: "Capacitively Coupled-Transistor . . . LCDS", Proceedings of the SID, vol. 28, No. 2, XP000028052, pp. 109-113.
I-Wei Wu: "High-Definition Displays . . . TFT-LCDS" Journal of the Society for Information Display, vol. 2, No. 1, Apr. 1994, XP000482979 p. 11.
Miyashita et al: "Wide viewing angle . . . crystal cell" Japanese Journal of Applied Physics, vol. 34, No. 2a, Feb. 1995, XP000600430, pp. L177-L179 .
Nakamura Hajime
Noguchi Michikazu
Duong Tai V.
International Business Machines - Corporation
Sbrollini J. P.
Sikes William L.
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