Provided is an organic light emitting display comprising: a substrate; an organic light emitting diode formed on the substrate; and an encapsulation layer for sealing the organic light emitting diode,wherein the encapsulation layer includes a structure in which at least two inorganic layers and at least one organic layer are alternatingly stacked, wherein one of the inorganic layers has a thickness of approximately 40 to 1000nm and an infraction of approximately 1.14 to 2.0, wherein one of the organic layers has a thickness of approximately 0.2 to 15mum and a refractive index of approximately1.4 to 1.65, wherein the organic layer is made from a display sealing material composition, and wherein the display sealing material composition comprises a photo-curable monomer and a photopolymerization initiator.