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Method and apparatus using liquid crystal light valve to filter incident light on a photodetector

  • US 7,214,927 B2
  • Filed: 10/08/2004
  • Issued: 05/08/2007
  • Est. Priority Date: 10/08/2004
  • Status: Active Grant
First Claim
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1. Apparatus, comprising:

  • a photodetector;

    a light valve comprising a liquid crystal element, positioned to filter incident light on the photodetector; and

    a control system to determine whether incident light on the photodetector is causing the photodetector to saturate and, if so, apply an electrical stimulus to adjust the light valve;

    wherein the light valve comprises a plurality of stacked liquid crystal elements, each of which serves to filter a different range of light wavelengths, and each of which is separately controlled by the control system.

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