×

Multistable chiral nematic displays

DC
  • US 5,453,863 A
  • Filed: 05/04/1993
  • Issued: 09/26/1995
  • Est. Priority Date: 05/02/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A light modulating polymer-free reflective cell comprising cell wall structure and a 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 an electric field 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 toxture, and an electric field 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.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×