Nematic liquid crystal displays for low voltage direct current operation

  • US 4,005,928 A
  • Filed: 08/01/1973
  • Issued: 02/01/1977
  • Est. Priority Date: 06/01/1971
  • Status: Expired due to Term
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First Claim
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1. An electro-optic display device comprising in combination:

  • a first optically transmissive substrate having an optically transmissive and electrically conductive region on one surface thereof,a second substrate having an electrically conductive region on one surface thereof,said first and second substrates spaced apart in a substantially parallel relationship such that said conductive regions face one another,a body of a mesomorphic liquid crystal composition substantially filling the space between said first and second substrates, said mesomorphic liquid crystal composition comprising liquid crystalline material in an amount from 98.0 to 99.5% by weight and electrical conductivity modifiers dispersed in said liquid crystalline material in an amount from 0.5 to 2.0% by weight of said mesomorphic liquid crystal composition, said mesomorphic liquid crystal composition being effective to scatter incident light in response to an electric field applied thereacross, and said conductivity modifiers dispersed in said liquid crystalline material cooperating therewith to effect a current density in said mesomorphic liquid crystal composition in the range of from 0.5 to 3.0 μ

    a/cm2 at 15 volts d.c., andan adsorbed layer of ion donor material formed on said conductive regions for enhancing electrical charge injection in sadi mesomorphic liquid crystal composition.

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