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

摘要

PROBLEM TO BE SOLVED: To provide an ambient light sensing circuit that can accurately sense ambient brightness, thereby automatically adjust screen brightness, according to the ambient brightness, and to provide a flat panel display that has the circuit.;SOLUTION: An ambient light sensing circuit includes a transistor; a first storage capacitor adapted to compensate for a threshold voltage of the transistor; a second storage capacitor electrically coupled to the first storage capacitor; a photodetector adapted to change a coupling voltage of the first and second storage capacitors, based on ambient light incident thereon; a first switch adapted to selectively apply the first power supply voltage to the output load and charge it; and a second switch electrically coupled to the transistor and the output load, and adapted to allow a charge stored in the output load to be discharged through the transistor, based on the coupling voltage of the first storage capacitor and the second storage capacitor.;COPYRIGHT: (C)2008,JPO&INPIT