Patent ID: 7410849

Claim:
A method for manufacturing a semiconductor device comprising: forming a first insulating film comprising silicon oxide over a glass substrate: forming a semiconductor film over the first insulating film; crystallizing the semiconductor film, wherein crystals of the semiconductor film extend in a direction in parallel with a surface of the first insulating film, and wherein a width of the crystals is 0.5 or more times the thickness of the semiconductor film; patterning the crystallized semiconductor film to form a semiconductor island having a source region, a drain region and a channel region; forming a second insulating film comprising silicon oxide covering the semiconductor island; forming a gate electrode over a portion of the semiconductor island with the second insulating film interposed therebetween; forming a third insulating film comprising silicon oxide covering the gate electrode and the second insulating film; forming a contact hole in the third insulating film reaching the source region and the drain region of the semiconductor island; and forming a wiring comprising a first layer and a second layer over the third insulating film, wherein the first layer comprises titanium and the second layer comprises aluminum.