Patent ID: 7223938

Claim:
A method for manufacturing a display device comprising: forming a semiconductor film over a substrate; irradiating a first region of the semiconductor film with a laser light in a first scanning direction; irradiating a second region of the semiconductor film with the laser light in a second scanning direction, wherein the second region is partially overlapped with the first region; irradiating the second region of the semiconductor film with the laser light in a third scanning direction, wherein the third scanning direction is opposite to the second scanning direction; irradiating the first region of the semiconductor film with the laser light in a fourth scanning direction, wherein the fourth scanning direction is opposite to the first scanning direction; etching the semiconductor film into a plurality of semiconductor layers; and forming a plurality of device formation regions in each of the first region and the second region by using at least one of the plurality of semiconductor layers, wherein the overlapped region of the first region and the second region is excluded from the device formation regions.