Patent ID: 7001829

Claim:
A method of manufacturing a semiconductor device, comprising: a first step of forming a semiconductor film over a substrate; a second step of holding a catalytic element that promotes the crystallization of said semiconductor film in contact with an entire surface of said semiconductor film; a third step of irradiating a laser beam shaped in a rectangle or a square while moving the laser beam from one side of said semiconductor film toward another side thereof to sequentially crystallize said semiconductor film to form a crystalline semiconductor film; a fourth step of patterning said semiconductor film to form at least first and second semiconductor islands after the irradiation of the laser beam, a fifth step of forming a first thin film transistor using said first semiconductor island, and forming a second thin film transistor using said second semiconductor island, and a sixth step of forming a portion of a pixel matrix circuit comprising said first thin film transistor, and forming a portion of a driving circuit comprising said second thin film transistor, wherein said laser beam has an irradiation area of 10 cm 2 or more.