Patent ID: 8624656

Claim:
A semiconductor device comprising: a first transistor; a second transistor; a third transistor; a fourth transistor; a fifth transistor; and a sixth transistor, wherein a first terminal of the first transistor is directly connected to a first wiring, and a second terminal of the first transistor is directly connected to a second wiring, wherein a first terminal of the second transistor is directly connected to a third wiring, and a second terminal of the second transistor is directly connected to the second wiring, wherein a second terminal of the third transistor is electrically connected to a gate of the first transistor, wherein a first terminal of the fourth transistor is directly connected to the third wiring, a second terminal of the fourth transistor is electrically connected to the gate of the first transistor, and a gate of the fourth transistor is directly connected to a gate of the second transistor, wherein a first terminal of the fifth transistor is directly connected to a fifth wiring, a second terminal of the fifth transistor is directly connected to the gate of the second transistor, and a gate of the fifth transistor is directly connected to a sixth wiring, and wherein a first terminal of the sixth transistor is directly connected to the third wiring, a second terminal of the sixth transistor is directly connected to the gate of the second transistor, and a gate of the sixth transistor is directly connected to a fourth wiring.