Patent ID: 7772135

Claim:
A method for forming a poly-silicon film, the method comprising steps of: providing a system for forming a poly-silicon film, comprising: a laser generator for generating a laser beam; and an optical device disposed in a traveling path of the laser beam so as to provide a periodic energy profile of at least a long-side edge of the laser beam passing through the optical device; providing a substrate with an amorphous silicon film formed thereon behind the optical device in the traveling path of the laser beam; performing a first laser irradiation process on the substrate using the laser beam irradiating through the optical device so as to melt the amorphous silicon film in irradiated regions; and removing the laser beam such that the melted amorphous silicon film in the irradiated regions solidifies to form poly-silicon regions, wherein the optical device comprises a plurality of first transparent regions, each of the first transparent regions having a first periodic shape on at least a long-side edge region thereof.