Patent ID: 7919399

Claim:
A semiconductor device manufacturing method for performing an annealing process of irradiating a semiconductor film on which element forming areas including thin film transistor forming areas are arranged in a two-dimensional pattern with energy beams using a plurality of irradiating optical systems, said method comprising: irradiating an area of said semiconductor film into thin film transistor forming areas, wherein each of said plurality of irradiating optical systems forms a thin film transistor forming area with an energy beam singly; forming a boundary area of said semiconductor film between an adjacent pair of said thin film transistor forming areas, each of the adjacent pair corresponding to a respective irradiating optical system of the plurality of irradiating optical systems; and irradiating said boundary area into a first irradiation part by one of said respective irradiating optical systems singly and a second irradiation part by the other of said respective irradiating optical systems singly, wherein, said first irradiation part and said second irradiation part are mixed with each other in each of two-dimensional directions in said boundary area.