Patent ID: 6992364

Claim:
A thin film transistor substrate for use in a LCD device, comprising: a substrate; a gate line over the substrate; a data line over the substrate, the data line being perpendicular to the gate line; a passivation layer pattern covering the data line, the passivation layer corresponding to and disposed along the data line; a doped amorphous silicon layer formed under the data line and corresponding in size to the data line; a pure amorphous silicon layer formed under the doped amorphous silicon layer and having an over-etched portion in peripheral portions, wherein the over-etched portion is over-etched from edges of the passivation layer pattern toward an inner side; an insulator layer under the pure amorphous silicon layer; a TFT formed near a crossing of the gate line and the data line; and a pixel electrode contacting the TFT, wherein the over-etched portion is over-etched from edges of the passivation layer pattern toward an inner side to be an empty space.