Control process for a matrix display means displaying grey level

Details Control process for a matrix display means displaying grey level Control process for a matrix display means displaying grey level

1986-04-04

1988-06-21

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340793, 340805, G09G 336

Patent

active

047527749

ABSTRACT:
A process for the control of a matrix display such as a liquid crystal display displaying grey levels comprising a display material inserted between m electrode rows and p electrode columns which cross the rows, a material zone M.sub.i N.sub.j being excited by the application to row M.sub.i of a first series of pulse signals and to column N.sub.j of a second series of continuous signals, with i,j being integers such that 1.ltoreq.i.ltoreq.m and 1.ltoreq.j.ltoreq.p, said signals being cyclical of cycle T with polarity reversal at each half-cycle T/2, T/2 being subdivided into n time fractions equal to 2.sup.(k-1) m.tau., in which k is an integer such that 1.ltoreq.k.ltoreq.n and .tau. a time interval useful for exciting the material, the signal of the second series having a maximum of 2 n polarity reversals over a cylcle T and for each time fraction being either in phase, or in phase opposition with the signal of the first series.

REFERENCES:
patent: 4117472 (1978-09-01), Freer et al.
patent: 4180813 (1979-12-01), Yoneda
patent: 4427978 (1984-01-01), Williams
patent: 4427979 (1984-01-01), Clerc et al.
patent: 4560982 (1985-12-01), Sonchara et al.

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