Patent ID: 7061559

Claim:
A method of producing additive and monochrome color images from a stacked chiral nematic liquid crystal display, comprising: passing incident light into a first layer of the display, said first layer comprising first chiral nematic liquid crystal material, the liquid crystal of said first material having a pitch length effective to reflect visible light of a first color; electrically addressing said first layer to reflect visible light from the display of said first color by transforming a portion of the liquid crystal of said first layer into a reflective twisted planar texture; passing said incident light through said first layer into a second layer of the display stacked relative to said first layer, said second layer comprising second chiral nematic liquid crystal material, the liquid crystal of said second material having a pitch length effective to reflect visible light of a second color; electrically addressing said first layer and said second layer to reflect visible light from the display of said second color by transforming a portion of the liquid crystal of said second layer into the reflective twisted planar texture and a portion of the liquid crystal of said first layer into the focal conic texture; and electrically addressing said first layer and said second layer to reflect visible light from the display of a color that is additive of said first color and said second color by transforming portions of the liquid crystal of said first layer and said second layer into the reflective twisted planar texture.