Ferroelectric liquid crystal devices

Details Ferroelectric liquid crystal devices Ferroelectric liquid crystal devices

1991-09-26

1993-11-09

Weldon, Ulysses

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

359 55, 359 56, 359 84, 359 85, G09C 336

Patent

active

052606996

ABSTRACT:
In a method of driving a ferroelectric liquid crystal display, a blanking pulse of width 2t.sub.s followed, after a delay of n.multidot.t.sub.s (where n is an integer), by a writing pulse of width t.sub.s and of opposite polarity to the blanking pulse are applied to successive row address lines at intervals of 2t.sub.s. Pairs of bipolar data pulses of width t.sub.s are applied to column address lines so that the data pulses coincide with the blanking pulse applied to the ith row and the writing pulse applied to row i-(n+1)/2 for odd values of n and to row 1-(n+2)/2 for even values of n. The data pulse amplitude may be varied in order to obtain variable grey levels in the display.

REFERENCES:
patent: 4909607 (1990-03-01), Ross
patent: 4927243 (1990-05-01), Taniguchi et al.
"Electro optic pulse response of ferroelectric liquid crystals", by F. C. Saunders et al., in Liquid Crystals, 1989, vol. 6, No. 3, pp. 341-347.

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