Patent ID: 7595143

Claim:
A method of manufacturing a thin-film transistor (TFT) substrate, which comprises: forming a first metal layer on a substrate and forming a gate electrode pattern from the first metal layer through a photolithography process; depositing an insulating layer, a semiconductor layer, a second metal layer and a photoresist film on the gate electrode pattern; disposing a mask having a slit exposure portion on the photoresist film and exposing the photoresist film to a light; developing the photoresist film to expose the second metal layer and etching the exposed second metal layer and the semiconductor layer, and wherein the developing of the photoresist film removes a non-exposed portion of the photoresist film and forms a remaining photoresist film having an edge portion with a taper angle more than or substantially equal to 90°; firstly stripping a portion of the remaining photoresist film to expose a portion of a remaining second metal layer; etching an exposed portion of the remaining second metal layer to expose a portion of a remaining semiconductor layer and to form a source electrode and a drain electrode; etching a portion of the remaining semiconductor layer exposed between the source electrode and the drain electrode; and secondly stripping the remaining photoresist film to completely remove the remaining photoresist film.