Patent ID: 7771901

Claim:
A layout method for a mask comprising: forming a main pattern on a substrate; and forming a plurality of dummy patterns, each having a same size as another, in regions other than the region in which the main pattern is formed, wherein forming the plurality of dummy patterns comprises: forming a plurality of mother dummy patterns separated from each other by a second spacing on the substrate; forming a plurality of child dummy patterns by dividing the plurality of mother dummy patterns into the child dummy patterns; and removing the child dummy patterns interacting with the main pattern, wherein forming the plurality of child dummy patterns comprises: forming a third pattern with a width and a height of the same size as a first spacing by reducing a first mother dummy pattern; forming a fourth pattern with a height of the same size as the first mother dummy pattern by expanding the third pattern in a vertical direction; forming a fifth pattern with a width of the same size as the first mother dummy pattern by expanding the third pattern in a horizontal direction; and using the fourth pattern and/or the fifth pattern to form the child dummy patterns.