Patent ID: 7158104

Claim:
A method of driving a display device which comprises a pixel comprising an EL element and a thin film transistor, comprising the step of: dividing one frame period into plural sub-frame periods, and applying one of a first gate voltage and a second gate voltage to a gate electrode of the thin film transistor during each of the plural sub-frame periods, wherein a drain current of the thin film transistor flows between both electrodes of the EL element to place the EL element into an emitting state when the first gate voltage is applied to the gate electrode of the thin film transistor, wherein the thin film transistor is placed into a non-conductive state and the EL element is placed into a non-emitting state when the second gate voltage is applied to the gate electrode of the thin film transistor, and wherein the thin film transistor is operated in a saturation region in order to keep said drain current constant with respect to temperature variations.