Patent ID: 8003989

Claim:
A display device comprising: a gate wiring in a pixel portion and a first conductive layer in a terminal portion, wherein the gate wiring and the first conductive layer are formed from a same first conductive film over a substrate; a first insulating film formed over the gate wiring and the first conductive layer; a semiconductor film including a channel region formed over the first insulating film in the pixel portion; a source region and a drain region formed over the semiconductor film; a source wiring and a drain wiring formed over the source region and the drain region, respectively; a second conductive layer formed over the first insulating film in the terminal portion, wherein the source wiring, the drain wiring and the second conductive layer are formed from a same second conductive film; a second insulating film comprising an inorganic material formed over the gate wiring, the first conductive layer, the semiconductor film, the source region, the drain region, the source wiring, the drain wiring and the second conductive layer; a pixel electrode formed over the second insulating film in the pixel portion and electrically connected to the drain wiring through an opening of the second insulating film; and a third conductive layer formed over the second insulating film in the terminal portion, wherein the third conductive layer is in contact with a top surface and a side surface of the first conductive layer and a top surface and a side surface of the second conductive layer so that the first conductive layer and the second conductive layer are electrically connected to each other, wherein the pixel electrode and the third conductive layer are formed from a same transparent conductive oxide film.