Patent ID: 8367564

Claim:
A crystallization method using a sequential lateral solidification process, the method comprising: providing a substrate having an amorphous silicon layer, wherein the substrate has first and second sides opposing each other; and irradiating a laser beam onto the substrate so as to have an inclined angle with respect to the first and second sides of the substrate; and relatively moving one of the laser beam and the substrate with respect to the other i) in a first direction from the first side to the second side of the substrate and ii) in a second direction which crosses the first direction, wherein the substrate has third and fourth sides each substantially perpendicularly arranged with the first and second sides, wherein the third side has a lower end, wherein the fourth side has an upper end, and wherein the lower end and upper end of the substrate are substantially diagonally arranged with respect to each other, and wherein a relative movement velocity V of the laser beam in the second direction with respect to the substrate satisfies the following equation: V = C - C 2 + D 2 · cos ⁡ ( α + θ ) D A × B ⁢ wherein C represents the length of the first side or the second side of the substrate and D represents the length of the third side or fourth side of the substrate, wherein α represents an angle which an oblique line of the substrate forms with respect to the first side of the substrate and θ represents an inclined angle which the first side of the substrate forms with respect to the laser beam, and wherein A represents a scan pitch SC [nm] of the laser beam and B represents a frequency of the laser beam.