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Method of reducing the visual impact of defects present in a spatial light modulator display

  • US 5,504,504 A
  • Filed: 07/13/1994
  • Issued: 04/02/1996
  • Est. Priority Date: 07/13/1994
  • Status: Expired due to Term
First Claim
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1. A method of reducing the visual impact of defects present in an image display, the display being of the type which includes an array of pixels, each non-defective pixel being selectively operable, in response to input data provided by addressing facilities between an "on" state in which light is directed onto a viewing surface, and an "off" state in which light is not directed onto the viewing surface;

  • a defect being the result of a defective pixel which continuously remains in the "on" or "off" state regardless of the input data or the operation of the addressing facilities;

    each defective pixel being, in effect, a central defective pixel immediately surrounded by a first ring of compensation pixels adjacent to the central defective pixel with the first ring of compensation pixels being immediately surrounded by a second ring of reference pixels spaced from the central defective pixel;

    wherein the method comprises;

    (a) identifying a defect-producing defective pixel; and

    (b) changing the addressing circuit-determined value of at least one compensation pixel in the first ring surrounding the defective pixel to a corrective value given by;

    
    
    space="preserve" listing-type="equation">C.sub.NEW =C.sub.SINC (D.sub.ACT -D.sub.INT)=D.sub.INT wherein CNEW is the intensity value assigned to the compensation pixel, CSINC is the value of the sinc function evaluated for the compensation pixel, DACT is the actual intensity value of the defective pixel, and DINT is the intended intensity value of the defective pixel.

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