Grey scale liquid crystal material

Details Grey scale liquid crystal material Grey scale liquid crystal material

1992-05-18

1995-01-24

Tucker, Philip

Compositions

Liquid crystal compositions

428 1, 359 51, 359 91, C09K 1952, G02F 113

Patent

active

053840674

ABSTRACT:
A method of selectively adjusting the intensity of reflection to obtain stable grey scale reflectance of colored light from a light modulating chiral nematic liquid crystal material is disclosed. The method comprises subjecting the material to an electric field pulse of sufficient duration and voltage to cause a first proportion of the chiral nematic material to exhibit a first optical state and a second proportion of the chiral nematic material to exhibit a second optical state, whereby the material will continuously reflect a selected intensity between a maximum and minimum that is proportional to the amount of the material in the first optical state.

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