Patent ID: 7361606

Claim:
A method of manufacturing a display substrate, the method comprising: forming a gate insulating layer and a channel layer on a base substrate including a gate metal pattern, in sequence, the gate metal pattern including a gate line and a gate electrode of a switching element; forming a source metal layer on the channel layer, the source metal layer including a first metal layer including aluminum or aluminum alloy and a second metal layer protecting the first metal layer; dry-etching the source metal layer having the first and second metal layers to form a dry-etched source metal pattern, the source metal pattern including a source line, a source electrode and a drain electrode of the switching element; removing an etching material from an exposed surface of dry-etched first metal layer; forming a passivation layer on the base substrate having the source metal pattern from which the etching material is removed, the passivation layer having a contact hole through which the drain electrode is partially exposed; and forming a pixel electrode on the passivation layer, the pixel electrode electrically connected to the drain electrode through the contact hole.