Patent ID: 7740993

Claim:
A mask utilized in sequential lateral solidification (SLS) processes to form a polysilicon layer on an amorphous silicon layer, comprising: at least one first window having a length extending along a first direction, wherein the width of the first window is twice a predetermined value, wherein the predetermined value is a desired grain length of the polysilicon layer divided by a transverse magnification with which the mask is projected on the amorphous silicon layer; at least one second window having a length extending along the first direction and aligned to the first window with a width smaller than that of the first window; at least one third window having a length extending along the first direction; and at least one fourth window having a length extending along the first direction and aligned to the third window with a width greater than that of the third window, wherein each of the windows is spaced apart from each other by an intervening non-window portion, and each of the windows does not have any intervening non-window portions.