Patent ID: 8921230

Claim:
A method of manufacturing a display substrate, the method comprising: forming a data metal layer on a base substrate; etching the data metal layer to form a data line; forming an insulation layer covering the data line; forming a semiconductor pattern on the insulation layer; sequentially forming a gate insulation layer and a gate metal layer on the semiconductor pattern; etching the gate metal layer to form a gate line and a gate electrode; patterning the gate insulation layer to form a gate insulation pattern and to expose the semiconductor pattern; reducing an exposed portion of the semiconductor pattern to form a source electrode and a drain electrode, the source electrode and the drain electrode comprising a metal; and forming a connection electrode and a pixel electrode, the connection electrode electrically connecting the source electrode to the data line, the pixel electrode being electrically connected to the drain electrode, wherein at least one of the etching of the data metal layer and the etching of the gate metal layer comprising contacting with an etchant composition comprising about 25 percent by weight to about 35 percent by weight of phosphoric acid, about 3 percent by weight to about 9 percent by weight of nitric acid, about 10 percent by weight to about 20 percent by weight of acetic acid, about 5 percent by weight to about 10 percent by weight of a nitrate, about 6 percent by weight to about 15 percent by weight of a sulfonic acid, about 1 percent by weight to about 5 percent by weight of an amine compound comprising a carboxyl group, about 0.1 percent by weight to about 1 percent by weight of a water-soluble amino acid, about 0.01 percent by weight to about 1 percent by weight of an azole compound, each based on a total weight of the etchant composition, and water.