Patent ID: 7880836

Claim:
A liquid crystal display device comprising: a thin film transistor comprising: a gate electrode; a semiconductor layer; and 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 a first opening in the first insulating layer; a second conductive layer over the first insulating layer and in direct contact with the semiconductor layer through a second opening in the first insulating layer; a second insulating layer over the first conductive layer and the second 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 one of the first conductive layer and the second 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 third conductive layer made from a same film as the first conductive layer and the second conductive layer; and wherein the third conductive layer is in electrical contact with a fourth conductive layer made of the same film as the gate electrode.