An organic light emitting display including a back plane including an active area on which an image is displayed, and a bezel area outside the active area; a pixel array on the active area and configured to display the image; an encapsulation plate encapsulating the pixel array; a transparent adhesive film free of a moisture absorption filler, formed on the active area and disposed between the encapsulation plate and the back plane; and a dam including a sealant with a moisture absorption filler formed in the bezel area and adjoining the adhesive layer so as to limit moisture from penetrating into the pixel array.