Patent ID: 7170479

Claim:
A display device comprising: a pixel comprising: a first current source circuit; a second current source circuit; a first switch portion electrically connected to the first current source circuit in series between a light emitting element and a first line; and a second switch portion electrically connected to the second current source circuit in series between the light emitting element and the first line; wherein each of the first current source circuit and the second current source circuit comprises: a first transistor, a second transistor which is electrically connected to the first transistor in series between the first line and the light emitting element, and whose gate electrode is electrically connected to a gate electrode of the first transistor; a first means for holding a gate voltage of the first transistor; a second means for selecting an electrical connection between the gate electrode of the first transistor and a drain region of the first transistor; a third means for selecting an electrical connection between a second line and one of a source region of the first transistor and the drain region of the first transistor, and selecting an electrical connection between a third line and the other of the source region of the first transistor and the drain region of the first transistor.