Patent ID: 7758760

Claim:
A method of manufacturing a thin film transistor (TFT) array panel, the method comprising: forming a semiconductor layer and an ohmic contact layer over a gate line on a substrate; forming a conductive layer on the ohmic contact layer; forming a first photosensitive layer pattern on the conductive layer; etching the conductive layer using the first photosensitive layer pattern as an etching mask, so as to form an etched surface of the conductive layer, the ohmic contact layer and the semiconductor layer having a projection portion protruding from the etched surface and a covered portion covered by the conductive layer; etching back the projection portion and etching the covered portion from under the conductive layer with a fluorine-containing gas, a chloride-containing gas, and an oxygen (O 2 ) gas using the first photosensitive layer pattern as an etching mask; removing the first photosensitive layer pattern to a predetermined thickness to form a second photosensitive layer pattern; and etching the conductive layer using the second photosensitive layer pattern as an etching mask to expose a part of the ohmic contact layer.