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Liquid crystal displays

  • US 5,039,206 A
  • Filed: 07/24/1989
  • Issued: 08/13/1991
  • Est. Priority Date: 12/02/1987
  • Status: Expired due to Fees
First Claim
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1. A fluorescent liquid crystal display system, comprising:

  • a fluorescent liquid crystal cell switchable between a fluorescent state and a non-fluorescent state and having a first major surface at a viewing side of the cell, a second major surface on a reverse side of the cell, and edges interconnecting said major surfaces;

    a light source having a brightness, and operative for illuminating the cell;

    light-sensitive means positioned to receive edge fluorescence emitted from one of the edges, said edge fluorescence having a brightness which is substantially independent of the state of the cell, said light-sensitive means being operative for producing an output dependent upon the brightness of the edge fluorescence; and

    control means responsive to the output of the light-sensitive means for controlling the brightness of the light source illuminating the cell.

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