Method of driving a liquid crystal matrix panel

Details Method of driving a liquid crystal matrix panel Method of driving a liquid crystal matrix panel

1986-09-05

1991-04-23

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340305, G09G 336

Patent

active

050103270

ABSTRACT:
An improved driving method capable of achieving high-quality display even in simple matrix addressing for a ferroelectric liquid crystal matrix panel at a high multiplex ratio applies pulses of a frequency higher than that of a scanning voltage in an addressed condition to a scanning electrode in a non-addressed condition to gain either a surface stabilizing effect or an AC field stabilizing effect, hence ensuring high-contrast display. And the panel is so driven that the temporal average of the voltage applied to each pixel becomes zero, thereby averting deterioration of the liquid crystal.

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"Submicrosend Bistable Electro-Optic Switching in Liquid Crystals", by N. A. Clark et al., Applied Physics Letters, vol. 36, No. 11 (Jun. 1, 1980), pp. 899-901.
"Fast and Bistable Electro-Optic Displays Using Ferroelectric Liquid Crystals", by N. A. Clark et al., 1984 Eurodisplay, pp. 73-76.
"An Application of Chiral Smectic-C Liquid Crystal to a Multiplexed Large-Area Display", by T. Harada et al., 1985 SID International Symposium Digest of Technical Papers (May 1, 1985), pp. 131-134.

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