Patent ID: 8427464

Claim:
A display device comprising an active matrix substrate on which pixels having an active element and a pixel electrode are disposed in a matrix, the display device comprising: a photoreception unit provided on the active matrix substrate in correspondence with one or two or more of the pixels, and a driving unit that drives the photoreception unit, wherein the photoreception unit comprises a photodiode that outputs an electrical signal in accordance with an amount of received light, a capacitor that accumulates a charge in accordance with the electrical signal from when a reset signal from the driving unit has switched from a high level to a low level to when a readout signal at a high level has been applied from the driving unit, and a switching element that, while the readout signal is at the high level, allows output of a photoreception signal whose output level changes in accordance with the amount of accumulated charge, and in a row selection period, after writing of an image signal to the pixel electrodes in the row selected in the row selection period has ended, the driving unit switches the reset signal applied to the photoreception unit in the same row from the high level to the low level.