Patent ID: 7984390

Claim:
A computer-implemented design data processing method in a semiconductor device comprising the steps, performed by a computer, of: extracting, from design data, a graphic in which there exist, on the same plane, a first wiring and a second wiring which is directly connected to the first wiring to form right angles at first corners of a first connected portion, the first wiring and the second wiring being formed on the same plane in the semiconductor device; and changing the first corners to have first obliquely connected lines at an angle other than 90 degrees with respect to the first wiring line and the second wiring line on the same plane, thereby preparing new design data, wherein said changing the first corners to have first obliquely connected lines includes: extracting an inner right angle portion and an outer right angle portion, adding, to the inner right angle portion, an isosceles right triangle having one grid length as one side, deleting, from the outer right angle portion, the isosceles right triangle having the one grid length as the one side, and performing optical proximity correction.