Patent ID: 8593443

Claim:
A display device comprising a photosensor in a pixel region of an active matrix substrate, the photosensor comprising: a photodetection element that receives incident light; a storage node that is connected to the photodetection element, the potential of the storage node changing in accordance with an output current from the photodetection element; reset signal wiring that supplies a reset signal to the photosensor; readout signal wiring that supplies a readout signal to the photosensor; and a sensor switching element for reading out the potential of the storage node to output wiring as sensor circuit output, the potential of the storage node having changed in accordance with the amount of light received by the photodetection element in a sensing period, the sensing period being from when the reset signal is supplied until when the readout signal is supplied, wherein the potential of wiring having a parasitic capacitance with the storage node is fixed to a predetermined potential at least either one of immediately before the readout signal and immediately before the reset signal.