Patent ID: 7177003

Claim:
A method of fabricating a liquid crystal display device, the method comprising: sequentially forming a first aluminum alloy layer and a first copper metal layer on a substrate; forming a photoresist pattern on the first copper metal layer and etching the first copper metal layer and the underlying first aluminum alloy layer to form a gate line; depositing and etching a gate insulating layer, an amorphous silicon layer and an impurity-doped amorphous silicon layer to form a semiconductor layer; sequentially forming and etching a second aluminum alloy layer and a second copper metal layer on the substrate to form a data line, a source electrode and a drain electrode; forming a passivation layer on the substrate including the data line, the source electrode and the drain electrode, and forming a contact hole and a pad opening in the passivation layer; and depositing a transparent conductive thin film on the substrate including the passivation layer having the contact hole and the pad opening.