Patent ID: 7517773

Claim:
A method of manufacturing a semiconductor device in which a driver circuit, comprising: forming an amorphous semiconductor film over a substrate; scanning a first portion of the amorphous semiconductor film with a continuous wave laser beam along a first direction to form a first crystalline semiconductor film wherein a beam spot of the continuous wave laser beam on the amorphous semiconductor film has a diameter corresponding to a width of the first portion; scanning a second portion of the amorphous semiconductor film with a continuous wave laser beam to form a second crystalline semiconductor film; etching the first crystalline semiconductor film to form first semiconductor islands and second semiconductor islands in the first portion; forming first thin film transistors including the first semiconductor islands as an active layer; and forming second thin film transistors including the second semiconductor islands as an active layer, wherein the first thin film transistors form a shift register, wherein the second thin film transistors form an NAND, and wherein the driver circuit includes the shift register and the NAND.