Liquid crystal devices and systems using such devices
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United States of America Patent
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Jul 18, 1989
Grant Date -
N/A
app pub date -
Sep 29, 1987
filing date -
Sep 29, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A liquid crystal device which uses parallel transparent plates having a nematic crystal material which is free of chiral or twisting additives positioned therebetween. The device applies an AC carrier modulated signal to establish an electric field across the material, the modulation level thereof controlling the state of the directors thereof over a range from a selected partially driven state to a fully driving state. The device can be used in a system to measure and to control the retardance of the device and in systems for controlling the intensity of light being transmitted through the device. The devices can further be used in a system to provide a birefringent filter.
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