Patent ID: 8853012

Claim:
A display device comprising: a substrate; a gate electrode disposed on the substrate; a gate insulating film disposed on the substrate so as to cover the gate electrode and having a convex portion conforming to a surface shape of the gate electrode and a step portion that changes in height along a shape rising from a periphery of the gate electrode; an oxide semiconductor layer disposed on the gate insulating film so as to have a transistor constituting region having a channel region, a source region, and a drain region in a continuous and integral manner and a covering region being separated from the transistor constituting region and covering the step portion of the gate insulating film; a channel protective layer disposed on the channel region of the oxide semiconductor layer; a source electrode and a drain electrode disposed in contact respectively with the source region and the drain region of the oxide semiconductor layer; and a passivation layer disposed on the source electrode and the drain electrode.