Patent ID: 8785933

Claim:
A semiconductor device comprising: a gate electrode including a pair of first protrusions and a second protrusion provided between the pair of first protrusions; a gate insulating film over the gate electrode; a semiconductor film which is in contact with the gate insulating film and overlaps with the pair of first protrusions and the second protrusion; and a pair of electrodes which is in contact with the semiconductor film and overlaps with the pair of first protrusions, wherein the second protrusion is wider than each of the pair of first protrusions, wherein side edges of the semiconductor film are on outer sides of top surfaces of the pair of first protrusions in a direction of a channel width of the semiconductor film, and wherein side edges of the pair of electrodes are on outer sides of top surfaces of the pair of first protrusions in the direction of the channel width of the semiconductor film.