Patent ID: 6919533

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 along a first scanning direction; irradiating the first region of the semiconductor film with the laser light along a second scanning direction which is opposite to the first scanning direction; irradiating a second region of the semiconductor film with the laser light along a third 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 along a fourth scanning direction which is opposite to the third 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 so as to exclude the overlapped region of the first region and the second region by using at least one of the plurality of semiconductor layers.