Liquid crystal cells – elements and systems – With specified nonchemical characteristic of liquid crystal... – Within smectic phase
Patent
1996-08-14
1998-08-25
Sikes, William L.
Liquid crystal cells, elements and systems
With specified nonchemical characteristic of liquid crystal...
Within smectic phase
349170, 349191, 349161, G02F 1141
Patent
active
057988145
ABSTRACT:
An improved method of driving liquid crystal optical devices utilizing a ferroelectric liquid crystal is described. A ferroelectric liquid crystal material disposed between a pair of substrates in the optical device has an apparent negative dielectric anisotropy at its operational temperatures, e.g. not higher than 40.degree. C. The liquid crystal consists of a number of layers normal to the substrates. The constituent layers consist, in turn, of liquid crystal molecules parallel to the substrates. Misalignment of the molecules yields bends in the layered structure which degrades the contrast ratio. When alternating electric field is given, the molecules are subjected to an electric torque which exerts thereon in order to force the molecules parallel to the substrate by virtue of the apparent negative dielectric anisotropy so that the bends can be removed. It was found that the absolute value of the apparent negative dielectric anisotropy increased as the driving frequency increased.
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Duong Tai V.
Ferguson Jr. Gerald J.
Semiconductor Energy Laboratory Co,. Ltd.
Sikes William L.
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