Patent ID: 6080527
Filing Date: 2000-06-27
Classification: G03F

Abstract:
An optical proximity correction method for rectifying a pattern on a photomask so that a high-quality negative photoresist pattern is produced, comprising the steps of:providing a main pattern, wherein the main pattern includes at least an L-shaped patch;dissecting the L-shaped patch into a first rectangular region and a second rectangular region, wherein the first rectangular region has a first shape center, a pair of parallel first edges and a pair of parallel second edges, the second rectangular region has a second shape center, a pair of parallel third edges and a pair of parallel fourth edges, and the first rectangular region contains a bend region of the L-shaped patch;reducing the area of the first rectangular region through shortening the distance from the first shape center to the first edges by a first length and the distance from the first shape center to the second edges by a second length; andreducing the area of the second rectangular region through shortening the distance from the second shape center to the third edges by a third length and the distance from the second shape center to the fourth edges by a fourth length.