Patent ID: 8373825

Claim:
A display device in which a plurality of photosensors are disposed in a display region, comprising: a display panel including a plurality of display pixel circuits and a plurality of sensor pixel circuits; a sensor signal processing circuit that processes output from the sensor pixel circuits; a light source provided on a back face of the display panel; a light shielding film provided between the sensor pixel circuits and the light source; a light source control unit that provides a period in which the light source is lit and a period in which the light source is extinguished in one frame period in a case where input is performed by the photosensors; a driving circuit that outputs, to the sensor pixel circuits, a first control signal that indicates a first detection period including the period in which the light source is lit and a second control signal that indicates a second detection period not including the period in which the light source is lit, and performs resetting and readout with respect to the sensor pixel circuits; and a difference circuit that obtains a difference between output from the sensor pixel circuits that is based on charge stored in accordance with incident light in the first detection period and output from the sensor pixel circuits that is based on charge stored in accordance with incident light in the second detection period, wherein the length of the first detection period and the length of the second detection period are equivalent, the light source is extinguished at the beginning of the first detection period, and the light source is lit at a time during the first detection period.