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Color graphic imager utilizing a liquid crystal display

  • US 4,944,578 A
  • Filed: 07/21/1988
  • Issued: 07/31/1990
  • Est. Priority Date: 07/21/1988
  • Status: Expired due to Fees
First Claim
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1. A display apparatus comprising:

  • a liquid crystal cell including(i) a liquid crystal material having a state of optical retardation variable only within a range between about 0.3 microns and 1.6 microns,(ii) a plurality of electrodes for applying an electric field across said liquid crystal material,(iii) a first polarizer at a viewing side of said cell(iv) a second polarizer on the side of said cell remote from said first polarizer, and(v) said liquid crystal material in said cell responsive to different magnitudes of the electric field for the display of perceived color differences;

    said cell part of a panel positionable on a stage projector, said panel having first and second transparent surfaces to establish a light path therethrough and said cell located therebetween; and

    means for interfacing said cell with a computer and for converting color display information produced by said computer to drive signals and means for applying said drive signals to said electrodes wherein different levels of average rms voltage are applied across selected ones of said electrodes to display said perceived color differences.

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