Patent ID: 8049255

Claim:
A display device comprising: an insulating substrate having a first surface; and a TFT element arranged on the first surface of the insulating substrate, wherein the TFT element includes a gate electrode, a gate insulating film, a semiconductor layer, and a source electrode and a drain electrode arranged in that order on the first surface of the insulating substrate, wherein the semiconductor layer includes: an island-shaped active layer composed of polycrystalline semiconductor; a contact layer formed above the active layer; and an insulating layer formed above the contact layer and sandwiched between the active layer and the source electrode or the drain electrode, wherein the insulating layer has an opening for electrically connecting the contact layer and the drain electrode or the source electrode, wherein the insulating layer and the contact layer each have a segment interposed between the active layer and the source electrode and another segment interposed between the active layer and the drain electrode, and wherein each contact layer segment is arranged on a side face of the active layer.