Liquid crystal color displays

Details Liquid crystal color displays Liquid crystal color displays

1980-01-23

1982-05-04

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340703, 340713, 340716, 350346, 350352, G09G 336

Patent

active

043284930

ABSTRACT:
A liquid crystal color display comprises a cathode ray tube which emits at two or more wavelengths, a liquid crystal cell, a neutral analyzer and two color selective polarizers. The cell is switched in synchronism with different images supplied to the cathode ray tube so that the different images are observed in the different colors simultaneously. The cell is respectively switched ON and OFF by application of signals at a low frequency f.sub.1 and a high frequency f.sub.h. To avoid a patch appearance due to different parts of the liquid crystal having different twists a gap is allowed between switching the signals f.sub.1 and f.sub.h so that the total shear of the liquid crystal may be kept below a critical shear value.

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