Patent ID: 7323351

Claim:
A thin film transistor device manufacturing method comprising the steps of: forming a semiconductor film in a thin film transistor forming region on a substrate; forming a gate insulating film and a gate electrode on the semiconductor film; forming an interlayer insulating film on an overall upper surface of the substrate; forming a first conductive film as a display electrode on the interlayer insulating film; forming contact holes, which reach the semiconductor film from a surface of the first conductive film, by a photolithography method; forming a second conductive film on the overall upper surface of the substrate; forming a resist film, which covers a wiring forming region and a display electrode forming region, on the second conductive film; etching the second conductive film and the first conductive film while using the resist film as a mask; removing the resist film in the display electrode forming region to leave the resist film in the wiring forming region; and removing the second conductive film on the display electrode forming region by an etching using the resist film as a mask.