Patent ID: 7033915
Filing Date: 2006-04-25
Classification: B23K,H01L

Abstract:
1. A method for crystallizing an amorphous silicon film formed on an amorphous substrate in order to fabricate a liquid crystal display by irradiating a laser beam onto the amorphous silicon film from a laser source, the method comprising the steps of: i) in a first laser irradiation process, selectively irradiating the laser beam onto a region of the amorphous silicon film through a first mask having a slit-shaped opening so that a primary, slit-shaped area of amorphous silicon film is melted by said laser beam; ii) in a second laser irradiation process, selectively irradiating silicon by a laser beam through a second mask having a slit-shaped opening that is at a predetermined angle relative to the slit in said first mask so as to melt at least some of the silicon melted during said first laser irradiation process so that when silicon melted in said second laser irradiation process solidifies, it forms a plurality of silicon crystal grains, and ii) in a third laser irradiation process, irradiating the laser beam onto one of grains formed in the poly-silicon film through a third mask, thereby forming a single crystalline silicon region having a desired size on a predetermined portion of the amorphous silicon film.