Patent ID: 7807322

Claim:
A method for performing a double exposure lithography process comprising: providing a photomask having a first region on which first mask patterns formed to be vertical line patterns are arranged offset from each other along an x-direction and a second region on which second mask patterns formed to be horizontal line patterns are arranged offset from each other along a y-direction; aligning the first region of the photomask to cover a predetermined region of a substrate; performing a first exposure process to expose the predetermined region of the substrate with dipole X illumination to expose the first mask patterns: moving the photomask to align the second region of the photomask to cover the entire predetermined region of the substrate, wherein the photomask is moved such that the second mask patterns are not overlapped on the exposed first mask patterns; and performing a second exposure process to expose the predetermined region of the substrate with dipole Y illumination to expose the second mask patterns, wherein first photoresist patterns corresponding to the first mask patterns and second photoresist patterns corresponding to the second mask patterns are respectively formed on the predetermined region of the substrate by the first and second exposure processes.