Patent ID: 8930858
Filing Date: 2015-01-06
Classification: G03F

Abstract:
1. A method for optical proximity correction, comprising: obtaining a retarget layout after a retarget process, wherein the retarget layout is dissected into a plurality of segments, and the retarget layout comprises a first original pattern, a first adding pattern and a second adding pattern; using a computer to calculate a distance between adjacent parallel segments, if the distance is greater than a first predetermined value, processing a smooth process to modify the retarget layout to generate a smooth layout, wherein the smooth process comprises the steps of: (a) changing the second adding pattern to a first smooth pattern; and (b) adding a second smooth pattern extending from a bottom of the first smooth pattern and shrinking a tail portion of the first adding pattern to a third smooth pattern, and the tail portion of the first adding pattern connecting to a top of the first smooth pattern; and applying an optical proximity correction process to the smooth layout to produce an optical proximity correction layout.