Patent ID: 8400191

Claim:
A semiconductor device comprising: a first transistor; a second transistor; a third transistor; a fourth transistor; a fifth transistor; a sixth transistor; a seventh transistor; an eighth transistor; a first capacitor; and a second capacitor; wherein: one of a source and a drain of the first transistor is electrically connected to a first wiring, the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the third transistor, the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the fourth transistor, the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the seventh transistor, a gate of the first transistor is electrically connected to one of a source and a drain of the second transistor, the gate of the first transistor is electrically connected to a first electrode of the first capacitor, the other of the source and the drain of the third transistor is electrically connected to a second electrode of the first capacitor, the other of the source and the drain of the third transistor is electrically connected to one of a source and a drain of the sixth transistor, the one of the source and the drain of the fourth transistor is electrically connected to one of a source and a drain of the eighth transistor, a gate of the fourth transistor is electrically connected to the other of the source and the drain of the eighth transistor, the gate of the fourth transistor is electrically connected to a first electrode of the second capacitor, the other of the source and the drain of the fourth transistor is electrically connected to a second electrode of the second capacitor, the other of the source and the drain of the fourth transistor is electrically connected to the second wiring, and the first transistor, the fourth transistor, and the fifth transistor are connected in series between the first wiring and the second wiring.