Liquid crystal devices and systems using such devices

Details Liquid crystal devices and systems using such devices Liquid crystal devices and systems using such devices

1987-09-29

1989-07-18

Heyman, John S.

350335, 350346, G02F 113

Patent

active

048488771

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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patent: 4690508 (1987-09-01), Jacob
patent: 4726663 (1988-02-01), Buzak
patent: 4729640 (1988-03-01), Sakata
A. M. Title, "Improvement in Birefringent Filters", Applied Optics, vol. 15, No. 11, Nov. 1976.
I. Soc, "Birefringent Chair Filters", Journal of the Optical Society of America, vol. 55, No. 6, Jun. 1965.
J. L. Fergason "Performance of a Matrix Display Using Surface Niode", 1980 Biermal Display Research Conference (IEEE), pp. 177-179, Oct. 1980.

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