Patent ID: 7859494

Claim:
A display device comprising: a light emitting element; a storage capacitor; a driving transistor which has a control terminal and supplies a driving current to the light emitting element to emit light; a first switching transistor which applies a data voltage to the control terminal of the driving transistor and the storage capacitor in response to a first gate scanning signal, a light sensor which senses an amount of light according to the light emitted from the light emitting element and generates a sensing signal depending on the sensed light amount; a signal controller which determines a luminance corresponding to the sensing signal, compares the determined luminance and a target luminance corresponding to the data voltage, and modifies an image signal; a second switching transistor which applies a reverse bias voltage to the control terminal of the driving transistor and the capacitor in response to a second gate scanning signal before the data voltage is applied to the driving transistor; a third switching transistor which connects the driving transistor to a driving voltage according to an inversion signal during the application of the data voltage to the driving transistor; and an inversion unit which comprises: a first transistor having a control terminal and an input terminal that are connected to a gate-on voltage and an output terminal connected to the third switching transistor; and a second transistor having a control terminal connected to the first gate scanning signal, an input terminal connected to the second gate scanning signal, and an output terminal connected to the third switching transistor, wherein an on-pulse of the second gate scanning signal applied to the second switching transistor occurs prior to an on-pulse of the first gate scanning signal applied to the first switching transistor.