Patent ID: 7388226

Claim:
A thin film transistor substrate comprising: a first conductive layer formed on the substrate, the first conductive layer containing a gate line and a common line arranged in parallel to each other; a gate insulating film on the first conductive layer; a second conductive layer forming a data line 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 semiconductor pattern including the thin film transistor and overlapping the data line; a common electrode extending from the common line into the pixel area, the common electrode formed by the first conductive layer; a protective film covering the data, gate, and common lines and common electrode and the thin film transistor; a pixel hole that passes through the protective film and the gate insulating film and exposes a portion of a drain electrode and the substrate in the pixel area; and a third conductive layer forming a pixel electrode that is defined by the pixel hole and forms a horizontal electric field along with the common electrode; wherein the pixel electrode contacts the gate insulating film on at least two different sides.