Patent ID: 7473497

Claim:
A method of manufacturing a phase shifting mask (PSM), the method comprising the steps of: forming a phase shifting layer having optical transmittance greater than 0 on a transparent substrate; forming a material layer, the optical transmittance of which is determined by its thickness, on the phase shifting layer; patterning the phase shifting layer and the material layer to form a first pattern comprising a first phase shifting layer pattern and a first material layer pattern and to form at least one second pattern which is formed proximal to, and spaced apart from, the first pattern, the at least one second pattern comprising a second phase shifting layer pattern and a second material layer pattern such that the second phase shifting layer pattern and the second material layer pattern have line widths that are substantially equal, wherein the line width of the at least one second pattern is smaller than the line width of the first pattern; and removing the first material layer pattern from the first pattern to form a main pattern.