Patent ID: 7687808

Claim:
A display device comprising: a pixel portion including a plurality of pixels; and a driver circuit electrically connected to the pixel portion, wherein the driver circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, and a seventh transistor, wherein a first electrode of the first transistor is electrically connected to a fourth wiring, and a second electrode of the first transistor is electrically connected to a third wiring, wherein a first electrode of the second transistor is electrically connected to a sixth wiring, and a second electrode of the second transistor is electrically connected to the third wiring, wherein a first electrode of the third transistor is electrically connected to a fifth wiring, a second electrode of the third transistor is electrically connected to a gate electrode of the second transistor, and a gate electrode of the third transistor is electrically connected to a seventh wiring, wherein a first electrode of the fourth transistor is electrically connected to the sixth wiring, a second electrode of the fourth transistor is electrically connected to the gate electrode of the second transistor, and a gate electrode of the fourth transistor is electrically connected to a gate electrode of the first transistor, wherein a first electrode of the fifth transistor is electrically connected to the seventh wiring, a second electrode of the fifth transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the fifth transistor is electrically connected to a first wiring, wherein a first electrode of the sixth transistor is electrically connected to the sixth wiring, a second electrode of the sixth transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the sixth transistor is electrically connected to the gate electrode of the second transistor, and wherein a first electrode of the seventh transistor is electrically connected to the sixth wiring, a second electrode of the seventh transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the seventh transistor is electrically connected to a second wiring.