Patent ID: 7638253

Claim:
A method of manufacturing a thin-film transistor substrate, the method comprising: sequentially forming a gate insulation layer, an active layer and a data metal layer on a base substrate having a gate line and a gate electrode; coating a photoresist composition on the data metal layer to form a photoresist film, the photoresist composition comprising: about 1 to about 70 parts by weight of a first binder resin for increasing heat resistance and including a repeat unit represented by about 1 to about 70 parts by weight of a second binder resin for increasing adhesion ability and containing a repeat unit represented by wherein R 1 and R 2 independently represent an alkyl group having 1 to 5 carbon atoms, and n and m independently represent a natural number; about 0.5 to about 10 parts by weight of a photo-acid generator; about 1 to about 20 parts by weight of a cross-linker; and about 10 to about 200 parts by weight of a solvent; exposing the photoresist film to light and developing the photoresist film to form a first photoresist pattern; etching the data metal layer and the active layer using the first photoresist pattern as a mask to form a data line and a channel portion, respectively; removing a portion of the first photoresist film to form a second photoresist pattern exposing a portion of the data metal layer; and etching the data metal layer and the active layer using the second photoresist pattern as a mask to form a source electrode, a drain electrode and an ohmic contact pattern.