Patent ID: 8803150

Claim:
A display device, comprising: an insulating substrate; and a thin film transistor formed on the insulating substrate, wherein the thin film transistor comprises: a conductive layer provided with a gate electrode; a gate insulating layer which is provided on the conductive layer and contains an insulating material; an oxide semiconductor film which is provided in contact with an upper surface of the gate insulating layer and is provided above the gate electrode; a source electrode which is provided in contact with a first region provided in an upper surface of the oxide semiconductor film; a drain electrode which is provided in contact with a second region spaced apart from the first region, the second region being provided in the upper surface of the oxide semiconductor film; and a channel protective film which contains the insulating material and is provided in contact with a third region provided between the first region and the second region, the third region being provided in the upper surface of the oxide semiconductor film, wherein, in plan view, a first portion of the oxide semiconductor film, which overlaps with the gate electrode, is a part of a larger second portion of the oxide semiconductor film, which overlaps with the channel protective film, and wherein a portion of the oxide semiconductor film, except for at least one part of the first portion of the oxide semiconductor film, has a resistance lower than a resistance of another part of the first portion of the oxide semiconductor film.