Patent ID: 8541785

Claim:
A display device comprising: a thin film transistor over a substrate, the thin film transistor including a gate wiring, a gate insulating film over the gate wiring, and a source wiring and a drain wiring over the gate wiring; a first wiring over the substrate, the first wiring comprising a same material as the gate wiring; an insulating film over the first wiring, the insulating film comprising a same material as the gate insulating film; and a second wiring over the insulating film, the second wiring comprising a same material as the source wiring and the drain wiring, wherein the insulating film includes a depressed portion which is overlapped with the first wiring and the second wiring, wherein the first wiring is not in contact with a bottom of the depressed portion, wherein part of the second wiring is provided inside the depressed portion, and wherein the first wiring, the insulating film and the second wiring form a protection circuit.