Patent Document ID: 20020188924
Application ID: 10082697
Patent Status: 0

Claim One:
1. A method for producing a computer readable definition of a photolithographic mask or masks used to define a target pattern in a layer to be formed using the mask or masks, wherein said pattern includes a target feature; the method comprising: laying out a first mask pattern including phase shift windows having boundaries defined by line segments in the first mask layout, and a second mask pattern including trim shapes having boundaries defined by line segments in the second mask pattern, wherein in combination the first and second mask patterns are used for defining said target feature of said target pattern, a first phase shift window in the first mask pattern being defined by a plurality of line segments, including at least one line segment abutting the target feature and a second phase shift window in the first mask pattern being defined by a plurality of line segments, including at least one line segment abutting the target feature, and a trim shape including a transmissive region in the second mask pattern being defined by a plurality of line segments, including at least one line segment abutting the target feature, in which a shape caused by a phase transition between said first and second phase shift windows in the first mask pattern is cleared by said transmissive region in said trim shape in the second mask pattern; adjusting positions of said at least one line segment of said first phase shift window in said first mask pattern, and of said at least one line segment of said trim shape in said second mask layout to provide proximity correction; and storing a result of said laying out and said adjusting in a computer readable medium.