Patent ID: 8309965

Claim:
A display device, comprising a thin-film transistor and a capacitor element which are formed on a substrate, wherein: the thin-film transistor comprises: a first insulating film which is formed to cover an area where a gate electrode is formed; a second insulating film which is formed on the first insulating film, the second insulating film having an opening formed in the area where the gate electrode is formed in plan view; a semiconductor layer which is formed in an island shape on the second insulating film to cross the opening and is polycrystalline, the semiconductor layer including high concentration areas formed at both ends of the semiconductor layer; a third insulating film which is formed on an upper surface of the semiconductor layer to expose a part of each of the high concentration areas formed at the both ends of the semiconductor layer; and a pair of electrodes each having electrical connection to the part of each of the high concentration areas formed at the both ends of the semiconductor layer, the part being exposed at the third insulating film; and the capacitor element comprises a dielectric film which is formed of an insulating film formed of the same layer and the same material as the third insulating film.