Patent ID: 7081400

Claim:
A method for manufacturing a polysilicon layer, comprising: providing a substrate; forming an amorphous silicon layer having a first region and a second region on the substrate, wherein the first region and the second region respectively have a first thickness and a second thickness, and the first thickness is greater than the second thickness; completely melting the amorphous silicon layer to form a melted amorphous silicon layer having a first melted region and a second melted region, so that a first temperature of a bottom center of the first melted region is lower than a second temperature of a top of the first melted region and a third temperature of the second melted region; and crystallizing the melted amorphous layer to form a polysilicon layer, so that the crystallization begins from the bottom center of the first melted region to the second melted region and to the top of the first melted region.