Liquid crystal optical shutter

Details Liquid crystal optical shutter Liquid crystal optical shutter

1994-06-27

1995-10-03

Thomas, Alexander S.

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With charge transferring layer of specified composition

359 36, 359 62, B32B 2740

Patent

active

054550831

ABSTRACT:
A liquid crystal optical shutter is disclosed.
The liquid crystal optical shutter comprises two sheets of transparent, conductive substrates; a light-adjusting layer supported between the sheets, which comprises a transparent, thin film of polymer prepared by photopolymerizing prepolymers containing approximately 20 to approximately 60% by weight of urethaneacrylate; and a liquid crystal component selected from the group consisting of a cholesteric liquid crystal, a chiral smectic liquid crystal and the mixture thereof, said liquid crystal being encapsulated within said thin film.
Superior in operating voltage, transmissivity and response time, the liquid crystal optical shutter is characterized by specifying a concentration range of the nematic liquid crystal, the base liquid crystal and introducing a flexible polytetramethylene chain with intermediate sizes into the polymer. The specific range and introduction allow the liquid crystal optical shutter to be operated at low voltages without delayed response time and have improved impact resistance. The liquid crystal optical shutter is operable at relatively low voltages of 3 to 12 V with t.sub.r +t.sub.d of 8 to 16 ms and a maximum contrast ratio of at least 120:1.

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