Grey scale liquid crystal material
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United States of America Patent
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Jan 24, 1995
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app pub date -
May 18, 1992
filing date -
May 2, 1991
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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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