Patent ID: 7999892

Claim:
A liquid crystal display device comprising: a thin film transistor comprising: a gate electrode; a semiconductor layer comprising polycrystalline silicon; a gate insulating layer separating the gate electrode and the semiconductor layer; a first insulating layer over the thin film transistor; a first conductive layer over the first insulating layer and in direct contact with the semiconductor layer through an opening in the first insulating layer; a second insulating layer over the first conductive layer; a common electrode over the second insulating layer; a third insulating layer over the common electrode; and a pixel electrode over the third insulating layer, wherein the pixel electrode is in electrical contact with the first conductive layer through an opening in the third insulating layer and an opening in the second insulating layer; wherein the common electrode is in electrical contact with a second conductive layer made from a same film as the first conductive layer; wherein the second conductive layer is in electrical contact with a third conductive layer made of the same film as the gate electrode; and wherein the common electrode substantially overlaps with the pixel electrode in an optically active region of a pixel.