Patent ID: 7686968

Claim:
A manufacturing method of an array substrate for a liquid crystal display device using a composition for removing conductive materials that includes a nitric acid of about 3 to 15 wt %, a phosphoric acid of about 40 to 70 wt %, an acetic acid of about 5 to 35 wt %, a chlorine compound of about 0.05 to 5 wt %, a chlorine stabilizer of about 0.01 to 5 wt %, a pH stabilizer of about 0.01 to 5 wt %, and water of residual quantity, the method comprising: forming a gate electrode on a substrate by etching a first metal layer using the composition; forming a gate insulating layer on the gate electrode; forming a semiconductor layer on the gate insulating layer; forming source and drain electrodes on the semiconductor layer by etching a second metal layer using the composition; forming a passivation layer on the source and drain electrodes, the passivation layer having a contact hole exposing the drain electrode; and forming a pixel electrode on the passivation layer by etching a third metal layer using the composition.