Patent ID: 8519408

Claim:
A method of fabricating a thin film transistor substrate, the method comprising: forming data wires on an insulating substrate; forming an organic insulating film on the data wires by applying a photosensitive composition, wherein the photosensitive composition comprises a terpolymer, about 5 to about 100 parts by weight of a positive type photosensitizer, based on 100 parts by weight of the terpolymer, about 5 to about 20 parts by weight of a plasticizer, based on 100 parts by weight of the terpolymer, and about 50 to about 90 parts by weight of a solvent, based on 100 parts by weight of the photosensitive composition, wherein the terpolymer is derived from an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or a mixture thereof, and an unsaturated epoxy group-containing compound and an olefinic compound; patterning contact holes in the organic insulating film; and forming pixel electrodes in the organic insulating film, the pixel electrodes being in electrical communication with the data wires via the contact holes.