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Field diode detection of excess light conditions for spatial light modulator

  • US 7,116,459 B2
  • Filed: 12/23/2002
  • Issued: 10/03/2006
  • Est. Priority Date: 12/27/2001
  • Status: Active Grant
First Claim
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1. A spatial light modulator comprising:

  • an array of spatial light modulating pixel elements;

    control circuitry to control the operation of the pixel elements;

    a diode placed around at least a portion of the perimeter of the pixel array and extending along an outer edge of at least two adjacent spatial light modulating pixel elements located along the perimeter of the pixel array, the diode operable to conduct current in response to light incident on the pixel array; and

    a disable circuit operable to receive the current from the diode and to deliver a disable signal to the control circuitry when the current exceeds a predetermined amplitude, said control circuitry operable to disable the array of spatial light modulating elements in response to the disable signal.

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