An organic light emitting display device comprising: a substrate and an encapsulation substrate that face each other, wherein the substrate, the encapsulation substrate and an area between the substrate and the encapsulation substrate have an active area and a non-active area surrounding the active area, and wherein the active area between the substrate and the encapsulation substrate comprises a plurality of sub pixels (Sub-P); a concave part included in the non-active area of the encapsulation substrate and comprising a bottom surface; a seal pattern disposed within the non-active area between the substrate and the encapsulation substrate and in a closed loop with a uniform height; a filling seal pattern of the same material as the seal pattern and filled in the concave part to overlap with the seal pattern; a first dam pattern and a second dam pattern, respectively disposed at a first end and a second end of the seal pattern on an inner surface of the substrate; and a third dam pattern and a fourth dam pattern, respectively disposed at a first end and a second end of the concave part on an inner surface of the encapsulation substrate, wherein the first dam pattern and the second dam pattern face respectively the third dam pattern and the fourth dam pattern such that the first dam pattern and the third dam pattern define an outer line of the seal pattern and the second dam pattern and the fourth dam pattern define an inner line of the seal pattern, and wherein, in a cross-sectional view taken along a line perpendicular to the inner line of the seal pattern, a distance between the third dam pattern and the fourth dam pattern is larger than a width of the bottom surface of the concave part. a substrate and an encapsulation substrate that face each other, wherein the substrate, the encapsulation substrate and an area between the substrate and the encapsulation substrate have an active area and a non-active area surrounding the active area, and wherein the active area between the substrate and the encapsulation substrate comprises a plurality of sub pixels (Sub-P); a concave part included in the non-active area of the encapsulation substrate and comprising a bottom surface; a seal pattern disposed within the non-active area between the substrate and the encapsulation substrate and in a closed loop with a uniform height; a filling seal pattern of the same material as the seal pattern and filled in the concave part to overlap with the seal pattern; a first dam pattern and a second dam pattern, respectively disposed at a first end and a second end of the seal pattern on an inner surface of the substrate; and a third dam pattern and a fourth dam pattern, respectively disposed at a first end and a second end of the concave part on an inner surface of the encapsulation substrate, wherein the first dam pattern and the second dam pattern face respectively the third dam pattern and the fourth dam pattern such that the first dam pattern and the third dam pattern define an outer line of the seal pattern and the second dam pattern and the fourth dam pattern define an inner line of the seal pattern, and wherein, in a cross-sectional view taken along a line perpendicular to the inner line of the seal pattern, a distance between the third dam pattern and the fourth dam pattern is larger than a width of the bottom surface of the concave part.