Patent ID: 7161179

Claim:
A method of manufacturing a liquid crystal display comprising: forming a semiconductor layer over an insulating surface; forming a first insulating film over the semiconductor layer; forming a gate electrode over the first insulating film; doping first impurity elements at a first concentration providing n-type into the semiconductor layer using the gate electrode as a mask to form a first n-type impurity region; etching the gate electrode to form a tapered portion of the gate electrode; doping second impurity elements at a second concentration smaller than the first concentration providing n-type into the semiconductor layer having the first n-type impurity region white passing through the tapered portion of the gate electrode to form a second n-type impurity region between the first n-type impurity region and a channel-forming region; forming a second insulating film so as to cover the gate electrode; and forming a wire over the second insulating film.