Patent ID: 7598005
Filing Date: 2009-10-06
Classification: G03F

Abstract:
1. A manufacturing method of a photomask including a first mask pattern formed in a first portion and a second mask pattern formed in a second portion, comprising: a first step creating a first design data of the first mask pattern and a second design data of the second mask pattern; and a second step forming the first mask pattern and the second mask pattern, based on the first design data and the second design data, wherein the first step comprises: creating the first design data in the first portion by using line segments that form a polygon shape on a first outline part of the first mask pattern and creating the second design data in the second portion, by using line segments that form a square shape and have a fewer number of angles than the line segments that form the polygon shape, on a second outline part of the second mask pattern and wherein the second step comprises: forming the first mask pattern where the first outline part is approximated to a curve, in the first portion; and forming the second mask pattern where the second outline part is approximated to a square shape, in the second portion.