Patent ID: 7342637

Claim:
A method for manufacturing a liquid crystal display (LCD) device, comprising: providing a substrate; forming a thin film transistor array on the substrate, the thin film transistor array having a plurality of gate lines and data lines, wherein the plurality of gate and data lines cross each other and define a plurality of pixel regions; forming a plurality of thin film transistors on a substrate, each of the plurality of thin film transistors comprising a drain electrode; forming a passivation layer over the entire surface of the substrate; forming a contact hole in the passivation layer over the drain electrodes of the plurality of thin film transistors; forming an amorphous indium tin oxide film on the passivation layer, wherein forming the amorphous indium tin oxide film includes using a target wherein zinc is added to the target; selectively crystallizing portions of the amorphous indium tin oxide film formed in the pixel regions; and selectively etching the uncrystallized portions of the amorphous indium tin oxide film with respect to the crystallized portions of the amorphous indium tin oxide film, the selectively etching including using an etchant having a temperature of about 60° C. or less, wherein the selectively etching includes using an etchant selected from the group consisting of diluted oxalic acid, diluted hydrochloric acid, and combinations of thereof, and the etchant has a concentration between about 2% and about 5%, and flux of the etchant is about 30 liter/minute.