Patent ID: 6397377
Filing Date: 2002-05-28
Classification: G03F

Abstract:
A method of performing optical proximity corrections of a photo mask pattern by using a computer, the computer comprising a memory for storing the photo mask pattern and programs, and a processor for executing the programs stored in the memory, the photo mask pattern being formed on a photo mask which is used when performing a photolithographic process for forming a predetermined original pattern by exposing a photo-resist layer in a predetermined area of a semiconductor wafer, the method comprising;dividing the photo mask pattern into a plurality of rectangular blocks, each of the rectangular blocks comprising four sides and four corners each formed by joining two adjacent sides wherein each rectangular block can be a bright rectangular block or a dark rectangular block, at least one side and two corners of the rectangular block are shared with another rectangular block; checking each of shared corners of the photo mask pattern to find corners which may be affected by an optic proximity effect; and modifying the corners, which may be affected so as to prevent them from being affected by the optic proximity effect by forming a protruded dark portion or a protruded bright portion at the corners for correcting the corners.