Patent ID: 7420209

Claim:
A semiconductor device comprising: a gate wiring formed over an insulating surface; an insulating film formed over the gate wiring; a first amorphous semiconductor film formed over the insulating film; a source region and a drain region each provided in a second amorphous semiconductor film containing an impurity element of one conductivity type, formed over the first amorphous semiconductor film; a source wiring provided on the source region and an electrode provided on the drain region; and a pixel electrode formed so as to partially overlap and be in contact with the electrode, wherein the overlapping portion of the pixel electrode is in direct contact with the electrode, wherein at least an end of the first amorphous semiconductor film has a tapered shape, wherein at least an end of the second amorphous semiconductor film has a tapered shape, wherein a taper angle of the second amorphous semiconductor film is different from that of the first amorphous semiconductor film, and wherein said pixel electrode is in contact with at least one of said tapered portion of the first amorphous semiconductor film and the second amorphous semiconductor film.