Patent ID: 8416225

Claim:
A display device comprising: an active matrix substrate; a photo sensor provided on a pixel region of the active matrix substrate; a sensor drive wiring connected to the photo sensor; a sensor drive circuit that supplies a sensor drive signal to the photo sensor via the sensor drive wiring; an amplifier circuit that amplifies a sensor output read out from the photo sensor in accordance with the sensor drive signal and outputs the sensor output as a photo sensor signal; and a signal processing circuit that processes the photo sensor signal outputted from the amplifier circuit, wherein the sensor drive circuit has operation modes of: a first operation mode for supplying a sensor drive signal of a first pattern to the photo sensor so as to output a photo sensor signal corresponding to a quantity of receiving light of the photo sensor to the signal processing circuit; a second operation mode for supplying a sensor drive signal of a second pattern in a frame between frames subjected to a sensor drive according to the first operation mode to the photo sensor so as to acquire a first photo sensor signal level for calibration corresponding to a case where the photo sensor detects a black level; and a third operation mode for supplying a sensor drive signal of a third pattern in a frame between frames subjected to a sensor drive according to the first operation mode to the photo sensor so as to acquire a second photo sensor signal level for calibration corresponding to a case where the photo sensor detects a white level, the display device further comprising a dummy pixel covered with a light-shield film on the pixel region; acquiring, during the first operation mode, the level of the photo sensor signal obtained on the basis of a sensor output from a photo sensor provided within the dummy pixel, as a third photo sensor signal level for calibration; and calibrating the photo sensor signal obtained on the basis of the sensor output from the photo sensor provided within the effective pixel during the first operation mode, in the signal processing unit by using the first to third photo sensor signal levels.