An organic light-emitting display device (100; 200), comprising: an organic light-emitting unit (130; 230) between two substrates (110, 120; 210, 220); and an adhesive unit (150; 250) configured to adhere the two substrates together, the adhesive unit comprising: three portions (P1, P2, P3) comprising a cured resin used as a base material configured to: suppress infiltration of external moisture into the organic light-emitting unit (130; 230); and decrease separation of at least one of the two substrates (110, 120; 210, 220) from the adhesive unit (150; 250) caused by the external moisture, and a plurality of additives (160; 260) in the resin to absorb moisture or oxygen, and wherein a first portion of the three portions (P1, P2, P3) is positioned at a center of the adhesive unit, a second portion of the three portions (P1, P2, P3) is positioned closer to the organic light emitting unit than the first portion and a third portion of the three portions (P1, P2, P3) is positioned further from the organic light-emitting unit than the first portion, wherein the concentration of the plurality of additives is highest in the first portion of the adhesive unit, characterized in that: the concentration of the plurality of additives gradually decreases from the center of the adhesive unit to edges of the adhesive unit, and wherein a width of the first portion of the adhesive unit is less than or equal to 50% of an overall width of the adhesive unit. an organic light-emitting unit (130; 230) between two substrates (110, 120; 210, 220); and an adhesive unit (150; 250) configured to adhere the two substrates together, the adhesive unit comprising: three portions (P1, P2, P3) comprising a cured resin used as a base material configured to: suppress infiltration of external moisture into the organic light-emitting unit (130; 230); and decrease separation of at least one of the two substrates (110, 120; 210, 220) from the adhesive unit (150; 250) caused by the external moisture, and a plurality of additives (160; 260) in the resin to absorb moisture or oxygen, and three portions (P1, P2, P3) comprising a cured resin used as a base material configured to: suppress infiltration of external moisture into the organic light-emitting unit (130; 230); and decrease separation of at least one of the two substrates (110, 120; 210, 220) from the adhesive unit (150; 250) caused by the external moisture, and suppress infiltration of external moisture into the organic light-emitting unit (130; 230); and decrease separation of at least one of the two substrates (110, 120; 210, 220) from the adhesive unit (150; 250) caused by the external moisture, and a plurality of additives (160; 260) in the resin to absorb moisture or oxygen, and wherein a first portion of the three portions (P1, P2, P3) is positioned at a center of the adhesive unit, a second portion of the three portions (P1, P2, P3) is positioned closer to the organic light emitting unit than the first portion and a third portion of the three portions (P1, P2, P3) is positioned further from the organic light-emitting unit than the first portion, wherein the concentration of the plurality of additives is highest in the first portion of the adhesive unit, characterized in that: the concentration of the plurality of additives gradually decreases from the center of the adhesive unit to edges of the adhesive unit, and wherein a width of the first portion of the adhesive unit is less than or equal to 50% of an overall width of the adhesive unit. the concentration of the plurality of additives gradually decreases from the center of the adhesive unit to edges of the adhesive unit, and wherein a width of the first portion of the adhesive unit is less than or equal to 50% of an overall width of the adhesive unit.