Patent ID: 7920277

Claim:
A method comprising: scanning a semiconductor film on a substrate with laser having a specific lasing frequency at a plurality of irradiation intensities to form a plurality of irradiation areas on the semiconductor film each corresponding to one of said irradiation intensities; illuminating said plurality of irradiation areas in block to receive light reflected from said irradiation areas in block; judging a microcrystallization intensity based on said received reflected light; determining an irradiation intensity based on said microcrystallization intensity; and scanning another semiconductor film with laser having said lasing frequency at said determined irradiation intensity to form a crystallized film, forming a semiconductor device on the crystallized film, wherein said judging includes: determining a plurality of judgment areas in each of said irradiation areas, each of said judgment areas in each of said irradiation areas corresponding to one of said judgment areas of the others of said irradiation areas to form a group of said judgment areas; comparing image data of corresponding said judgment areas in each group against one another to detect a maximum change in the chromaticity per unit change of said irradiation intensity in the each group; selecting one of said maximum changes per unit change of said irradiation intensity obtained in a plurality of said group; and determining said microcrystallization intensity based on said selected maximum change.