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Method and apparatus to control display brightness with ambient light correction

DC CAFC
  • US 8,223,117 B2
  • Filed: 12/17/2008
  • Issued: 07/17/2012
  • Est. Priority Date: 02/09/2004
  • Status: Active Grant
First Claim
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1. A brightness control circuit with selective ambient light correction comprising:

  • a first input configured to receive a user signal indicative of a user selectable brightness setting;

    a light sensor configured to sense ambient light and to output a sensing signal indicative of the ambient light level;

    a multiplier configured to selectively generate a combined signal based on both the user signal and the sensing signal; and

    a dark level bias configured to adjust the combined signal to generate a brightness control signal that is used to control a brightness level of a visible display such that the brightness control signal is maintained above a predetermined level when the ambient light level decreases to approximately zero.

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