Touch-sensor-equipped display device comrpising photodetecting elements

A display device including an active matrix substrate, the display device comprising:

• an optical sensor provided in a pixel region of the active matrix substrate;
• a sensor driving line connected to the optical sensor;
• a sensor driving circuit that supplies sensor driving signals including a reset signal and a readout signal via the sensor driving line to the optical sensor;
• an amplifying circuit that amplifies the signal read out from the optical sensor according to the sensor driving signals, and outputs the amplified signal as an optical sensor signal;
• a signal processing circuit that processes the optical sensor signal that is output from the amplifying circuit;
• and
• a light source for the optical sensor,
• wherein the optical sensor includes:
• a first sensor pixel circuit that, according to the sensor driving signals, accumulates electric charges corresponding to an amount of light received during an accumulation period in an ON time of the light source, and outputs a sensor signal corresponding to the accumulated electric charges when a readout period starts;
• and
• a second sensor pixel circuit that, according to the sensor driving signals, accumulates electric charges corresponding to an amount of light received during an accumulation period in an OFF time of the light source, and outputs a sensor signal corresponding to the accumulated electric charges when the readout period starts,
• wherein the sensor driving circuit supplies the reset signal to the optical sensor during a vertical flyback period in pixel display in the pixel region.