Abstract: A liquid crystal display comprises two transparent slides containing a thin layer of liquid crystal material which may be nematic or cholesteric. Addressing electrode structures on the inner faces of the slide allow voltages to be applied across the layer to cause an observable display effect. The voltage at which an observable display occurs is temperature dependent. Sensing electrodes are connected in series with a reference impedance (Z.sub.f). With a constant supply voltage (V.sub.o) across the sensing electrodes and reference impedance (Z.sub.f) the voltage (V.sub.LC) variation is used to control the voltages applied to the addressing electrode to compensate for temperature variations in the layer.
Type:
Grant
Filed:
December 20, 1978
Date of Patent:
July 17, 1984
Assignee:
The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland