Liquid crystal displays

Details Liquid crystal displays Liquid crystal displays

1983-02-10

1986-05-27

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340765, 340805, 340811, 350332, G09G 336

Patent

active

045918490

ABSTRACT:
A liquid crystal display includes a liquid crystal cell formed by enclosing a thin layer of a cholesteric liquid crystal material between two slides. A set of electrode structures is formed on each slide so that voltages may be applied to the liquid crystal material causing an observable display effect. Voltages are supplied to the electrodes in sequence by driver electronics under the control of a logic unit which also controls a variable voltage source supplying voltages to the driver electronics. The logic unit controls the drive electronics to give an R.M.S. voltage V.sub.x at elements required to be at an OFF state and an R.M.S. voltage V.sub.c higher than V.sub.x at elements required to be in an ON state. The logic unit also controls the voltage source to reduce its voltage output to both OFF and ON elements simultaneously while maintaining the ratio of V.sub.x and V.sub.c for a period while information displayed is to be changed.

REFERENCES:
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 3973252 (1976-08-01), Mitomo et al.
patent: 3976362 (1976-08-01), Kawakami
patent: 4050064 (1977-09-01), Hashimoto et al.
patent: 4359729 (1982-11-01), Nonomura et al.
patent: 4380008 (1983-04-01), Kawakami et al.
patent: 4465999 (1984-08-01), Tsuzuki et al.

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