Patent ID: 6908797

Claim:
A method of manufacturing a semiconductor device comprising a p-channel TFT comprising a first island-shaped semiconductor film and an n-channel TFT comprising a second island-shaped semiconductor film, the method comprising: adding a catalytic element to a semiconductor film; heating the semiconductor film to form a crystallized first region and a less crystallized second region than the first region; irradiating first laser light to the first region to form a more crystallized third region than the first region; irradiating second laser light to the second region to form a more crystallized fourth region than the second region; and patterning the third region and the fourth region to form the first island-shaped region and the second island-shaped region, respectively, wherein the first laser light has the same energy density from second laser light, and wherein a scan speed of the first laser light is faster than that of the second laser light.