Patent ID: 8782572
Filing Date: 2014-07-15
Classification: G03F

Abstract:
1. A method of optical proximity correction (OPC), comprising: providing a layout pattern comprising a plurality of geometric patterns to a computer system; classifying the layout pattern into a first sub-layout pattern and a second sub-layout pattern, wherein length-to-width ratios of all the geometric patterns in the first sub-layout are less than length-to-width ratios of all the geometric patterns in the second sub-layout pattern; performing an OPC calculation based on a first OPC model on the first sub-layout pattern so as to form a corrected first sub-layout pattern; performing an OPC calculation based on a second OPC model on the second sub-layout pattern so as to form a corrected second sub-layout pattern; and outputting the corrected first sub-layout pattern and the corrected second sub-layout pattern from the computer system into a photomask.