Patent ID: 8023055

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