Patent ID: 7834355

Claim:
A display device comprising: a first light emitting element; a driving transistor connected in series to the first light emitting element; a monitoring second light emitting element; a limiter transistor connected in series to the monitoring second light emitting element; a constant current source for supplying a constant current to the monitoring second light emitting element; and a circuit for outputting a potential corresponding to a potential which is inputted to said circuit, wherein a first electrode of the first light emitting element is connected to an output terminal of the circuit through the driving transistor; wherein a first electrode of the monitoring second light emitting element is electrically connected to an input terminal of the circuit through the limiter transistor; and wherein a channel length L 1 and a channel width W 1 of the driving transistor, and a channel length L 2 and a channel width W 2 of the limiter transistor satisfy L 1 /W 1 :L 2 /W 2 =1:2 to 1:10.