Patent ID: 7446337

Claim:
A thin film transistor substrate structure for using a horizontal electric field, comprising: a substrate; a gate line and a common line formed on the substrate parallel to each other from a first conductive layer; 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 crossing the gate line and the common line with the gate insulating film therebetween 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 from a third conductive layer connected to the common line, the common electrode deposed within a hole passing through the protective film and the gate insulating film; a pixel electrode formed from the second conductive layer, wherein the pixel electrode is extended from a drain electrode of the thin film transistor to define a horizontal electric field between the pixel electrode and the common electrode; and a gate pad having a lower gate pad electrode formed from the first conductive layer connected to the gate line, and an upper gate pad electrode formed from the third conductive layer connected to the lower gate pad electrode through a first contact hole defined through the protective film and the gate insulating film.