Patent ID: 7471271

Claim:
A display device comprising: a pixel portion comprising a light emitting element, a fourth transistor, a fifth transistor, and a sixth transistor; a signal line for in putting a signal to the light emitting element; a scan line provided across the signal line; a reverse voltage applying circuit connected to the scan line; and a controlling circuit comprising a seventh transistor and an eighth transistor, wherein the reverse voltage applying circuit comprises: an analog switch connected to the scan line, the analog switch comprising a first transistor of which a gate electrode is connected to an anode line and a second transistor of which a gate electrode is connected to a first power supply line; and a third transistor of which a gate electrode is connected to a cathode line or the first power supply line, a first electrode thereof is connected to the anode line, and a second electrode thereof is connected to the scan line, wherein a first electrode of the seventh transistor and a gate electrode of the eighth transistor are connected to the anode line, and a second electrode of the seventh transistor and a first electrode of the eighth transistor are connected to a second power supply line, wherein the first transistor and the second transistor have a different polarity with respect to each other, and wherein a gate electrode of the fourth transistor is connected to the scan line, a first electrode of the fourth transistor is connected to a gate electrode of the fifth transistor, a first electrode of the fifth transistor is connected to the anode line, a second electrode of the fifth transistor is connected to a first electrode of the sixth transistor, a second electrode of the sixth transistor is connected to the light emitting element, and a gate electrode of the sixth transistor is connected to the second power supply line.