Patent ID: 7557382

Claim:
A display device, comprising: an insulating substrate; a switching thin film transistor having an input terminal receiving a data voltage, a control terminal and an output terminal formed on the insulating substrate and having a first semiconductor layer comprising amorphous silicon; a driving thin film transistor formed on the insulating substrate having a control terminal connected with an output terminal of the switching thin film transistor, the driving transistor including a second semiconductor layer comprising poly silicon; a light sensor formed on the insulating substrate including a third semiconductor layer, a sensor input terminal and a sensor output terminal electrically connected with the third semiconductor layer; an insulating layer formed on the light sensor; a first electrode formed on the insulating layer and electrically connected with an output terminal of the driving thin film transistor; an organic layer formed on the first electrode including a light emitting layer; a second electrode formed on the organic layer; and a controller which controls the data voltage based on an output of the light sensor.