Patent ID: 7504183

Claim:
A phase-shifting mask (PSM), comprising: a transparent substrate; a first phase-shifting line pattern having multiple first columns, each first column having first transparent regions and first 5%-10% light transmittable block areas intermittently and alternately disposed with respect to the first transparent regions on the transparent substrate along a first direction and multiple second columns respectively having second transparent regions each aligning a corresponding one of the first 5%-10% light transmittable block areas and second 5%-10% light transmittable block areas intermittently and alternately disposed with respect to the second transparent regions on the transparent substrate along the first direction, wherein each second 5%-10% light transmittable block area aligns a corresponding one of the first transparent regions in a second direction; and a 100% light transmittable second phase-shifting line pattern having multiple columns each sandwiched between two adjacent first column and second column of the first phase-shifting line pattern.