Patent ID: 8519628

Claim:
A light-emitting device comprising: a light-emitting element; a first transistor; a second transistor; a third transistor; a fourth transistor; and a fifth transistor, wherein one of a source and a drain of the first transistor is electrically connected to the light-emitting element, wherein the other of the source and the drain of the first transistor is electrically connected to a first wiring, wherein a gate of the first transistor is electrically connected to one of a source and a drain of the second transistor, wherein the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the third transistor and one of a source and a drain of the fourth transistor, wherein the other of the source and the drain of the third transistor is electrically connected to the first wiring, wherein the other of the source and the drain of the fourth transistor is electrically connected to one of a source and a drain of the fifth transistor, wherein the other of the source and the drain of the fifth transistor is electrically connected to a second wiring, wherein a gate of the fifth transistor is electrically connected to a third wiring, wherein a gate of the second transistor is electrically connected to a fourth wiring, and wherein a gate of the third transistor and a gate of the fourth transistor are electrically connected to a fifth wiring.