Patent ID: 6995048

Claim:
A method of manufacturing a thin film transistor, comprising: forming a semiconductor film as an island over an insulating substrate; forming a first insulating film on said insulating substrate and said semiconductor film covering said semiconductor film; forming at least one first contact hole penetrating said first insulating film and exposing part of said semiconductor film; forming a first conductive film on said first insulating film and in said first contact hole, and etching said first conductive film to simultaneously form a gate electrode overlapping part of said semiconductor film and a first contact electrically connected to said semiconductor film in said first contact hole; forming a second insulating film covering said first insulating film, said gate electrode, and said first contact; forming a second contact hole penetrating at least said second insulating film and exposing part of said first contact; forming a second conductive film on said second insulating film and in said second contact hole, and etching a predetermined area to form a wiring in a predetermined shape and a second contact, electrically connected to said first contact; and forming a second insulating film covering said first insulating film, said gate electrode, and said first contact; forming at least two second contact holes penetrating at least said second insulating film and exposing parts of said first contact and said semiconductor film; and forming a second conductive film on said second insulating film and in said second contact holes, and etching a predetermined area to form a wiring in a predetermined shape and a second contact, electrically connected to said semiconductor film.