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Field sequential color illumination system for liquid crystal display

  • US 5,428,366 A
  • Filed: 03/01/1993
  • Issued: 06/27/1995
  • Est. Priority Date: 09/09/1992
  • Status: Expired due to Term
First Claim
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1. A device for displaying an image by sequential, multi-monochromatic color illumination, comprising:

  • an illuminator including a plurality of different monochromatic light sources for producing a plurality of different monochromatic colors of light;

    an array of light valves located in front of the illuminator and in optical alignment therewith;

    an electronic controller connected to the illuminator for setting each of the plurality of different monochromatic light sources in one of an on and an off state and for spatially and temporally multiplexing the plurality of different monochromatic colors;

    a lens sheet disposed between the illuminator and the array of light valves for imaging the plurality of different monochromatic light sources in a plane adjacent the light valve array in which at least a portion of each of the light valves is illuminated by any one of the plurality of different monochromatic colors during a first illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources, further wherein a different portion of each of the light valves is illuminated by a different one of the monochromatic colors during a second sequential illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources, and still further wherein another different portion of each of the light valves is illuminated by another different one of the monochromatic colors during a third sequential illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources,whereby after the third illumination period each light valve has been illuminated by all of the different monochromatic colors.

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