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Polymer stabilized black-white cholesteric reflective display

  • US 5,847,798 A
  • Filed: 05/06/1997
  • Issued: 12/08/1998
  • Est. Priority Date: 05/02/1991
  • Status: Expired due to Term
First Claim
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1. A light modulating reflective cell comprising cell wall structure and a polymer containing chiral nematic liquid crystal light modulating material having positive dielectric anisotropy and a pitch length effective to reflect light in the visible spectrum, said cell wall structure and liquid crystal cooperating to form focal conic and twisted planar textures that are stable in the absence of a field, and means for addressing said liquid crystal material, said means adapted to selectively establish a first voltage pulse of a magnitude effective to transform at least a portion of said liquid crystal from a focal conic texture to a light reflecting twisted planar texture, and a second voltage pulse of a magnitude effective to transform at least a portion of said liquid crystal from a light reflecting twisted planar texture to a focal conic texture, wherein the light reflecting twisted planar texture appears substantially white.

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