Patent ID: 8274077

Claim:
An active matrix liquid crystal display device comprising: a gate electrode over a substrate; an insulating film over the gate electrode; an oxide semiconductor film over the gate electrode with the insulating film interposed therebetween; a channel protective film formed over the oxide semiconductor film, the channel protective film having a taper shape; a source electrode and a drain electrode formed over the oxide semiconductor film and the channel protective film, wherein the source electrode is in contact with a side surface of the oxide semiconductor film and the drain electrode is in contact with a side surface of the oxide semiconductor film; a passivation film comprising an insulating material formed over at least the source electrode, the drain electrode, the channel protective film and the oxide semiconductor film; and a pixel electrode formed over the passivation film and electrically connected to one of the source electrode and the drain electrode, wherein a channel region of the oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium.