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Liquid crystal display device

  • US 4,232,948 A
  • Filed: 07/12/1974
  • Issued: 11/11/1980
  • Est. Priority Date: 07/18/1973
  • Status: Expired due to Term
First Claim
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1. A liquid crystal device comprising:

  • (1) a liquid crystal cell capable of rotating plane polarized light and comprising;

    (i) two spaced transparent slides,(ii) a layer of a liquid crystal material comprising a cholesteric liquid crystal material having a molecular pitch substantially different from the wave length of visible light disposed between the two slides and(iii) an electrode structure mounted on each slide for applying an electric field across the thickness of the liquid crystal layer;

    (2) at least one layer of birefringent material arranged parallel to the cell; and

    (3) a polarizer and analyzer arranged parallel to the cell;

    the arrangement being such that when an electric field is applied to the electrode structures the color of light passing through the device is observed to vary with variation in applied electric voltage.

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