Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors

  • US 7,220,006 B2
  • Filed: 08/06/2004
  • Issued: 05/22/2007
  • Est. Priority Date: 08/08/2003
  • Status: Expired due to Fees
First Claim
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1. An apparatus for improving the operation of a digital image projector, comprising:

  • a video input board of the projector;

    a light engine of the projector, said light engine receiving video signals and generating a light output for at least one primary color there from;

    optics for transforming the light output from said light engine to a focused image for projection to a display screen;

    a variable luminance control mechanism, associated with the optics, for receiving the light output and provide a correction thereto; and

    an adaptive luminance control module, for receiving signals from said video input board, said adaptive luminance control module producing a control signal, wherein said variable luminance control mechanism operates in response to the control signal to change the luminance of the light output and provide a corrected video signal for the projector, and wherein the adaptive luminance control module comprises;

    a video receiver for receiving video signals and buffering the signals;

    a luminance level processor for deriving a characteristic of the buffered video signals and producing a luminance content signal; and

    an adaptive gamma processor, receiving the luminance content signal from the luminance level processor, for looking-up a modified video signal in response to the buffered video signal and the luminance content signal.

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