Patent ID: 8717262

Claim:
A light-emitting device comprising: a first transistor; a second transistor; a third transistor; a first conductive film; a second conductive film; a first wiring; a second wiring; a third wiring; a fourth wiring; a fifth wiring; and an EL element, wherein the first conductive film comprises a first region configured to function as a sixth wiring, a second region configured to function as a gate electrode of the first transistor and a third region configured to function as a gate electrode of the second transistor, wherein the second conductive film comprises a first region configured to function as a seventh wiring and a second region configured to function as a gate electrode of the third transistor, wherein one of a source and a drain of the first transistor is electrically connected to the first wiring, wherein 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 second transistor, wherein the other of the source and the drain of the second transistor is electrically connected to the seventh wiring through the second wiring, wherein one of a source and a drain of the third transistor is electrically connected to the third wiring, wherein the other of the source and the drain of the third transistor is electrically connected to the EL element through the fourth wiring, wherein the fifth wiring is electrically connected to the sixth wiring, wherein the fifth wiring comprises a region overlapping with the first wiring, wherein the first conductive film, the second conductive film and the first wiring comprise a same metal material, and wherein the second wiring, the fourth wiring and the fifth wiring comprise a same metal material.