A thin film transistor (TFT) array panel with signal lines that have low resistivity is presented. The TFT array panel includes an insulating substrate, a gate line formed on the insulating substrate, a gate insulating layer formed on the gate line, a drain electrode and a data line having a source electrode formed on the gate insulating layer, the drain electrode facing the source electrode with a gap, and a pixel electrode connected to the drain electrode. In one embodiment, at least one of the gate line, the data line, and the drain electrode includes a first conductive layer made of a Mo-containing conductor, a second conductive layer made of a Cu-containing conductor, and a third conductive layer made of a MoN-containing conductor.