Method of manufacturing organic light-emitting display apparatus

A deposition apparatus includes (i) a sheet including a slit area, first and second dummy slit areas, and a binding area; and (ii) a frame. The slit area has a plurality of patterning slits that are extended along a first direction and arranged along a second direction crossing the first direction. The first and second dummy slit areas are outside the slit area along the second direction and along the opposite direction to the second direction respectively and have a plurality of dummy slits. The binding area surrounds the slit area and the first and second dummy slit areas. The frame is attached to the binding area of the sheet and shields at least some of the plurality of dummy slits of the first and second dummy slit areas.