Patent ID: 8409940

Claim:
A silicon crystallization method, which comprises: providing a silicon crystallization apparatus including an optical device for generating laser beams, a stage for fixing a substrate having silicon deposited thereon, for being rotatably and movably provided with the substrate in a horizontal direction, and a sensing device provided in the optical device for sensing the position of the substrate; forming an amorphous silicon layer over an entire surface of the substrate defined as a display area and a non-display area; fixing the substrate to the stage; aligning the substrate by sensing the fixed substrate with the sensing device, and moving and/or rotating the stage, wherein the sensing device faces toward an edge of the substrate to directly sense the edge of the substrate; forming alignment keys on predetermined portions of the non-display area of the substrate by correspondingly placing a mask for formation of alignment key above the substrate; and crystallizing the amorphous silicon by correspondingly providing a mask for crystallization above the substrate.