Light valves with positive dielectric anisotropy liquid crystal

Details Light valves with positive dielectric anisotropy liquid crystal Light valves with positive dielectric anisotropy liquid crystal

1988-03-14

1990-04-17

James, Andrew J.

350338, 350346, 350347E, 350337, G02F 113

Patent

active

049174720

ABSTRACT:
A liquid crystal cell useful in light valves is disclosed in which positive anisotropy liquid crystals are installed at an initial off-perpendicular alignment within the approximate range of 6.degree.-45.degree.. A light valve employing the cell is initially biased to a voltage approximately corresponding to a transmissivity peak; the selection of the exact bias voltage involves a trade-off between contrast and response speed. The cell surfaces are characterized by generally flat macrostructures and tilted surface microstructures, with an overcoat on the surfaces of a long chain alcohol with alkoxy groups derived therefrom bonded to the tilted surface microstructure. The alcohol molecules have the formula ROH, where R is a carbon chain having at least six carbon atoms therein.

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