Patent ID: 7277138

Claim:
An array substrate for a liquid crystal display device, comprising: a gate electrode, a gate line and a gate pad electrode disposed on a substrate, each of the gate electrode, the gate line and the gate pad electrode having a first metal barrier layer, a first copper alloy layer, and a first out-diffusion film, and the first out-diffusion film completely covering, surrounding and contacting entire surfaces of the first copper alloy layer; a gate insulation layer disposed on the substrate and covering the gate electrode, the gate line and the gate pad electrode; an active layer and an ohmic contact layer sequentially formed on the gate insulation layer and over the gate electrode; a data line formed on the gate insulation layer and perpendicularly crossing the gate line; a source electrode and a drain electrode contacting the ohmic contact layer; a data pad electrode disposed on the gate insulation layer; a passivation layer formed on the gate insulation layer, the passivation layer covering the data line, the source electrode, the drain electrode and the data pad electrode, and the passivation layer having a plurality of contact holes, including a drain contact hole that exposes a portion of the drain electrode, a gate pad contact hole that exposes a portion of the gate pad electrode, and a data pad contact hole that exposes a portion of the data pad electrode; and a pixel electrode, a gate pad terminal and a data pad terminal, each of which is formed on the passivation layer, and each of which includes a transparent conductive material.