A display device, comprising: an insulating substrate; a light sensor which includes a semiconductor layer disposed in a first region and a sensor input terminal and a sensor output terminal electrically connected with the semiconductor layer, and is formed on the insulating substrate; a first electrode, an organic light emitting layer and a second electrode which are sequentially formed on the light sensor; a color filter which is disposed between the insulating substrate and the first electrode, and is formed in a second region that is different from the first region; and a controller which controls a data voltage supplied to one of the first electrode and the second electrode based on an output of the light sensor.