Patent ID: 7129121

Claim:
A method for manufacturing a semiconductor device comprising: forming an insulating film having plural projections over a substrate; forming a first film comprising amorphous semiconductor over the insulating film and at least between the projections; heating the first film for improving crystallinity of the first film comprising amorphous semiconductor, thereby producing a second film comprising crystalline semiconductor; etching the second film comprising crystalline semiconductor, thereby forming plural third films comprising crystalline semiconductor; irradiating the plural third film comprising crystalline semiconductor with a laser beam having a linear shape with changing a position of the substrate relative to the laser beam for improving crystallinity of the plural third films, thereby producing a plural fourth films comprising crystalline semiconductor; etching the plural fourth films comprising crystalline semiconductor for forming plural fifth films comprising crystalline semiconductor from the plural fourth films; and forming a circuit comprising plural transistors from at least a part of the plural fifth films comprising crystalline semiconductor, wherein at least the part of the fifth films are obtained from at least two of the fourth films.