Patent ID: 7955784

Claim:
A method of manufacturing a thin-film transistor substrate, the method comprising: forming a gate line on a base substrate, sequentially forming a gate insulating layer, a semiconductor layer and a data layer on the gate line and the base substrate; coating a photoresist composition on the data layer to form a photoresist film, the photoresist composition comprising about 100 parts by weight of a resin mixture including novolak resin and acryl resin and about 10 parts to about 50 parts by weight of a naphthoquinone diazosulfonic acid ester; patterning the photoresist film to form a photoresist pattern; firstly etching the data layer by using the photoresist pattern as a mask; etching the semiconductor layer by using an etched data layer; heating the photoresist pattern to form a heated photoresist pattern after etching the semiconductor layer by using the etched data layer; and secondly etching the data layer by using the heated photoresist pattern as a mask.