Patent ID: 8257905

Claim:
A method of fabricating a thin film transistor substrate, comprising: forming a conductive film composed of a conductive material on a substrate; forming an etch pattern composed of a negative photoresist composition on the conductive film; and forming a conductive film pattern by etching the conductive film using the etch pattern as an etching mask; wherein the negative photoresist composition includes 10-50 parts by weight of novolak resin including a hydroxyl group that is soluble in an alkali developing solution, 0.5-10 parts by weight of a first photo acid generator represented by the following formula (1), 0.5-10 parts by weight of a second photo acid generator represented by the following formula (2), 1-20 parts by weight of a cross-linking agent, and 10-90 parts by weight of a solvent: