Patterning slit sheet assembly, organic layer deposition apparatus, method of manufacturing organic light-emitting display apparatus, and the organic light-emitting display apparatus

A patterning slit sheet assembly for depositing a thin film in a desired pattern on a substrate, the patterning slit sheet assembly comprising:

• a patterning slit sheet having a plurality of slits corresponding to the desired pattern;
• a frame combined with the patterning slit sheet to support the patterning slit sheet;
• and
• a support unit comprising an upper member configured to be moved or fixed to support the patterning slit sheet when a gravitational force is applied to the patterning slit sheet, a lower member disposed more apart from the patterning slit sheet than the upper member, and a plurality of middle members, each of the plurality of middle members being separated from any other of the plurality of middle members by a distance, wherein the upper member is configured to be fixed or moved upward and downward on the lower member via the plurality of middle members.