LCD including a negative biaxial retarder on each side of the liquid crystal layer

  • US 5,694,187 A
  • Filed: 01/21/1997
  • Issued: 12/02/1997
  • Est. Priority Date: 12/15/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A normally white twisted nematic liquid crystal display comprising:

  • a liquid crystal layer for twisting at least one normally incident visible wavelength of light from about 80°


    as it passes therethrough when said liquid crystal layer is in substantially an off state thereby defining a twisted nematic display;

    first and second negative biaxial retarders, each of said first and second negative biaxial retarders defined by nx >

    ny >

    nz, where nx, ny, and nz are respective indices of refraction for each of said biaxial retarders; and

    wherein said first negative biaxial retarder has a retardation value d·

    (nz -nx) of from about -100 to -200 nm.

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