Mask, mask assembly having the same, and method of repairing the mask

A method of repairing a mask, comprising:

• providing a mask comprising a mother member, a plurality of first openings extending entirely through the mask, and an over-processed opening adjacent to one of the plurality of first openings and having a size different from a size of each of the plurality of first openings, each of the plurality of first openings and the over-processed opening defined on the mother member;
• irradiating a first laser beam to an area of the mother member surrounding the over-processed opening to melt a portion of the mother member located at the area to form melted material and dispose the melted material into the over-processed opening to form a supplement portion in at least a portion of the over-processed opening;
• and
• forming a plurality of second openings spaced apart from each other on the mother member by irradiating a second laser beam to the supplement portion.