Liquid crystal device

Details Liquid crystal device Liquid crystal device

G - Physics

02

F

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G02F 1/13 (2006.01) G02F 1/139 (2006.01) G09F 9/35 (2006.01) G09G 3/36 (2006.01)

Patent

CA 1266908

ABSTRACT: Liquid crystal device. A liquid crystal device comprises between two supporting plates spaced apart ata distance d and having orientation layers, a nematic liquid crystal with a cholesteric addition. The mixture has a positive dielectric anisotropy and a natural pitch p such that the ratio d/p has a value between 0.5 and 1, whilst the directer due to the orientation layers shows a twist across the layer thickness d of greater than .pi. and less than .pi. radians, the director assuming a tilt-angle between 0° and 70° at one surface and a tilt-angle between 5° and 70° at the other surface. The voltage-transmission characteristic curve of such a device shows hysteresis. Starting from a given holding field in which the liquid crystal is in a first state, it can be switched to different (viewed macros- copically) intermediate transmission states (grey level) due to microscopic variations on the surface by means of pulsatory fields of different values whose energy content exceeds a certain threshold.

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