Patent ID: 8035583

Claim:
A display device comprising: pixels each comprising: a first thin film transistor; a second thin film transistor; a resistor; and an EL element, wherein: a gate of the first thin film transistor is electrically connected to a gate line, one of a source and a drain of the first thin film transistor is directly connected to a source line, the other of the source and the drain of the first thin film transistor is directly connected to a gate of the second thin film transistor, one of a source and a drain of the second thin film transistor is electrically connected to a first terminal of the resistor, a second terminal of the resistor is electrically connected to a power supply line, the other of the source and the drain of the second thin film transistor is electrically connected to the EL element, the second thin film transistor is operated in a saturation region, the pixels are driven by a time gray scale method, in which gray scales are represented by a cumulation of periods per frame period during which each of the EL elements emits light, and the EL element overlaps with the first thin film transistor and the second thin film transistor.