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Single panel color porjection video display having control circuitry for synchronizing the color illumination system with reading/writing of the light

  • US 5,508,738 A
  • Filed: 03/09/1995
  • Issued: 04/16/1996
  • Est. Priority Date: 12/27/1990
  • Status: Expired due to Term
First Claim
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1. A system for synchronization of a projection television system with a video signal comprising:

  • a video source having a video output and a synchronization signal;

    video memory means coupled to said video output of said video source;

    light valve means connected to said video memory means;

    an illumination system for illuminating said light valve means;

    a first control circuit having a control output to said video memory means to control the writing of the video to said video memory means in response to the synchronization signal of said video source;

    a second control circuit controlling the writing of the video to said light valve means, said second control circuitry further including means for controlling the illumination in relation to the light valve means and means for receiving an input based on the illumination on said light valve; and

    means for connecting and disconnecting said first and second control circuits from each other so that said first and second control circuits can be operated synchronously when connected and asynchronously when disconnected.

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