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Ambient light sensing circuit and flat panel display including ambient light sensing circuit

  • US 20090015166A1
  • Filed: 12/26/2007
  • Published: 01/15/2009
  • Est. Priority Date: 12/27/2006
  • Status: Active Grant
First Claim
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1. An ambient light sensing circuit adapted to be electrically coupled to a first power supply for supplying a first power supply voltage and an output load coupled to a storage capacitor, the ambient light sensing circuit comprising:

  • a transistor;

    a first storage capacitor coupled to the transistor and adapted to compensate for a threshold voltage of the transistor;

    a second storage capacitor coupled to the first storage capacitor;

    a photodiode coupled to the first storage capacitor and the second storage capacitor, the photodiode being adapted to change a coupling voltage of the first storage capacitor and the second storage capacitor based on ambient light incident thereon;

    a first switch adapted to selectively apply the first power supply voltage to the output load coupled to the transistor; and

    a second switch including a first electrode coupled to a first electrode of the transistor, and a second electrode coupled to the output load and a first electrode of the first switch, the second switch being adapted to allow a charge stored in the storage capacitor to be discharged through the transistor based on the coupling voltage of the first storage capacitor and the second storage capacitor.

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