Patent ID: 6883158
Filing Date: 2005-04-19
Classification: G03F

Abstract:
1. A method for predicting and correcting geometrical errors in lithography using masks, including large-area photomasks or reticles, and exposure stations, including wafer steppers or projection aligners, printing the pattern of said masks on a workpiece, including a display panel or a semiconductor wafer, comprising the steps of providing a mask substrate, providing a pattern data file, providing a mask writer for writing said pattern onto said mask substrate, collecting information about the mask writer or the mask writer and any of the mask substrate and the exposure station; predicting from said information distorsions that will occur in the pattern, when it is subsequently printed on the workpiece calculating from said prediction a correction map to diminish said predicted distorsion, and exposing said pattern onto said mask substrate while applying said correction map for said distorsions;