Patent ID: 8389988

Claim:
A display device comprising: a substrate; a scan line; a signal line intersecting with the scan line over the substrate; a pixel portion in which pixel electrodes are arranged in matrix, wherein the pixel portion comprises a thin film transistor; and a first non-linear element provided over the substrate in a region outside the pixel portion, wherein the thin film transistor and the first non-linear element each comprises: a gate electrode; a first oxide semiconductor layer; a first wiring layer; and a second wiring layer, wherein the gate electrode of the thin film transistor is connected to the scan line, wherein a channel formation region is formed in the first oxide semiconductor layer of the thin film transistor, wherein the first wiring layer of the thin film transistor is connected to the signal line and the first oxide semiconductor layer of the thin film transistor, wherein the second wiring layer of the thin film transistor is connected to the pixel electrode and the first oxide semiconductor layer of the thin film transistor, wherein the first oxide semiconductor layer of the first non-linear element is formed over the gate electrode of the first non-linear element, wherein a channel protective layer covers a region which overlaps with a channel formation region of the first oxide semiconductor layer of the first non-linear element, wherein the first wiring layer and the second wiring layer of the first non-linear element are formed over the channel protective layer and the gate electrode of the first non-linear element, wherein the gate electrode of the first non-linear element is connected to the scan line, wherein one of the first wiring layer and the second wiring layer of the first non-linear element is directly connected to a wiring formed with the same layer as the gate electrode of the first non-linear element, wherein a first insulating film comprising silicon nitride is formed over the thin film transistor and the first non-linear element, and wherein a second insulating film comprising an organic material is formed over the first insulating film.