Patent ID: 7378230

Claim:
A method for forming a photoresist pattern on a large-scale substrate, comprising: applying a photoresist composition to the large-scale substrate with a multi-micro nozzle (MMN) head coater, drying the photoresist composition applied to the large-scale substrate to prepare a photoresist film; placing a patterned mask over the photoresist film and substrate and exposing the photoresist film to light; and developing the exposed photoresist film to obtain a photoresist pattern; wherein the photoresist composition comprises: (a) 5 wt % to 30 wt % of a polymer resin represented by the following Chemical Formula 1; (b) 2 wt % to 10 wt % of a diazide photoactive compound; (c) 50 wt % to 90 wt % of an organic solvent; and (d) 500 to 4000 ppm of a Si based surfactant: wherein R is C 1 to C 4 alkyl, and n is an integer of 15 to 10,000, and wherein the Si-based surfactant is a polyoxyalkylene dimethylpolysiloxane copolymer compound, wherein the composition and content of solvent and surfactant is controlled to prevent stains and improve coating characteristics in a photoresist film formed on the substrate from the photoresist composition, and wherein stains include central stains, lateral stains, or cloudy stains.