Patent ID: 7241650

Claim:
A method of manufacturing a polysilicon layer, comprising: providing a substrate; forming an amorphous silicon layer having a first region and a second region on the substrate; melting completely the amorphous silicon layer in the first region and preheating the amorphous silicon layer in the second region; crystallizing the completely melted amorphous silicon layer in the first region to form a first polysilicon layer; melting completely the preheated amorphous silicon layer in the second region; and crystallizing the completely melted amorphous silicon layer in the second region to form a second polysilicon layer, wherein the step of melting completely the amorphous silicon layer in the first region and preheating the amorphous silicon layer in the second region comprises: providing a mask having a first semi-transparent region and a transparent region, wherein the first semi-transparent region and the transparent region correspond to the surface of the amorphous silicon layer in the second region and the surface of the amorphous silicon layer in the first region, respectively; and projecting a laser beam onto the mask, wherein the laser beam penetrates through the transparent region and partly penetrates through the first semi-transparent region.