Patent ID: 6821686
Filing Date: 2004-11-23
Classification: G03F

Abstract:
A method of repairing a defect in a graytone mask, wherein the graytone mask comprises an opaque part, a transmission part and a graytone part including an opaque pattern, wherein the defect causes the graytone part to differ from an intended graytone part including an intended opaque pattern which does not exceed a resolution limit of an exposure apparatus using the intended graytone mask so that the intended graytone part has a graytone effect in which an amount of light transmitted through the intended graytone part is attenuated thereby selectively varying a thickness of a photoresist film to be exposed through the graytone mask, the method comprising forming a repairing pattern which structurally differs from the intended opaque pattern, wherein the graytone part with the repairing pattern provides a graytone effect substantially equal to the graytone effect of the intended graytone part.