Patent ID: 7499117

Claim:
A liquid crystal display device comprising: a conductive layer over an insulating surface; a gate electrode formed on the conductive layer; a semiconductor film formed on the gate electrode sandwiching an insulating film; a source region and a drain region formed on the semiconductor film; a source electrode formed over the source region; a drain electrode formed over the drain region; a barrier film formed so as to cover at least portions of an end surface of the source electrode, an end surface of the drain electrode, an end surface of the source region, an end surface of the source region, an end surface of the drain region, and an end surface of the semiconductor film; and a pixel electrode formed so as to cover the drain electrode and the barrier film, wherein at least a portion of an end surface of the source region approximately corresponds to an end surface of the semiconductor film and an end surface of the source electrode; and wherein at least a portion of an end surface of the drain region approximately corresponds to an end surface of the semiconductor film and an end surface of the drain electrode, and wherein a portion of the conductive layer which is not overlapped with the gate electrode is oxidized and insulated.