Patent ID: 7586197

Claim:
A thin film transistor (TFT) substrate comprising: a gate wire disposed on an insulating substrate and comprising a gate line extending in a first direction and a gate electrode connected to the gate line; a data wire insulated from the gate wire on the insulating substrate and comprising a data line extending in a second direction to intersect the gate line, a source electrode connected to the data line, and a drain electrode separated from the source electrode; a passivation layer disposed on the data wire and having a contact hole exposing the drain electrode; and a pixel electrode disposed on the passivation layer and connected to the drain electrode through the contact hole, wherein the gate wire or the data wire has a barrier layer disposed on a lower structure, a copper conductive layer comprising copper or copper alloy disposed on the barrier layer, an intermediate layer comprising copper nitride disposed on the copper conductive layer, and a capping layer disposed on the intermediate layer, and wherein the barrier layer, the copper conductive layer, the intermediate layer, and the capping layer have substantially the same pattern shape.