Patent ID: 8432503
Filing Date: 2013-04-30
Classification: G02F

Abstract:
1. A method of forming an array substrate for use in a liquid crystal display device, comprising: forming a first metal layer and a first barrier metal layer on a substrate; patterning the first metal layer and the first barrier metal layer to form a gate electrode, a gate line and a gate pad on the substrate; forming a gate insulation layer on the substrate to cover the gate electrode, line and pad; forming sequentially an active layer, an ohmic contact layer, a second barrier metal layer and a second metal layer on the gate insulation layer; forming a photoresist pattern on the second metal layer; patterning the second metal layer and the second barrier metal layer by a first etching process; patterning the active layer and ohmic contact layer by a second etching process; ashing the photoresist pattern to partially expose the second metal layer; patterning the exposed portion of the second metal layer and second barrier metal layer and ohmic contact layer to form a source electrode and a drain electrode each having a double-layered structure of the second barrier metal layer and the second metal layer; forming a passivation layer on the source electrode and the drain electrode; and forming a pixel electrode on the passivation layer, wherein the second metal layer includes copper (Cu) layer.