PURPOSE: A mask assembly is provided to manufacture a plurality of organic light emitting diodes in a mother board using one mask assembly by arranging a plurality of masks including a pattern corresponding to one organic light emitting diode in a first direction. CONSTITUTION: In a mask assembly, a frame(100) supports the both ends of a mask(200) and a support stick(300). A frame comprises an opening(110) exposing the mask to the outside. The frame includes a first support unit(120) and a second support unit(130) which are opposite to each other. A plurality of masks include a pattern unit(210) corresponding to the organic light emitting diode. The support stick is extended to a first direction crossing with a second direction.
