Patent ID: 7488633
Filing Date: 2009-02-10
Classification: H01L

Abstract:
1. A method for crystallizing amorphous silicon into polysilicon, the method comprising the steps of: illuminating a laser beam at a first area of an amorphous silicon substrate through a first mask region including a plurality of first slit patterns, wherein each of the plurality of the first slit patterns is spaced apart by a first one pitch from another and is extending in the perpendicular direction to a mask moving direction; moving the mask by d/4 distance, wherein the ‘d’ is the length of the mask along the moving direction; and illuminating a laser beam at the first area of the amorphous silicon substrate through a second mask region including a plurality of second slit patterns, wherein each of the plurality of the second slit patterns is spaced apart by the first one pitch from another and is extending in the same direction as the first slit patterns, wherein the first slit patterns and the second slit patterns are deviated from each other by the first one pitch and the first one pitch is smaller than each widths of the first and the second slit patterns.