Patent ID: 7576822

Claim:
A thin film transistor substrate structure for using a horizontal electric field, comprising: a substrate; a gate line and a common line formed parallel with each other from a first conductive layer on the substrate; a gate insulating film formed on the substrate, the gate line and the common line; a data line formed from a second conductive layer on the gate insulating film, the data line crossing the gate line and the common line to define a pixel area; a thin film transistor connected to the gate line and the data line; a protective film covering the data line and the thin film transistor; a common electrode formed connected to one side surface and upper surface of the common line from a third conductive layer, the common electrode being disposed within a first hole through the protective film and the gate insulating film; and a pixel electrode connected to the thin film transistor and formed from the third conductive layer, the pixel electrode being disposed within a second hole through the protective film and the gate insulating film at the pixel area, the pixel electrode and the common electrode being disposed to define a horizontal electric field, wherein the common electrode contacts side surface of the protective film and is absent from all upper surface of the protective film, and the pixel electrode contacts side surface of the protective film and is absent from all upper surface of the protective film.