An organic light-emitting display device, comprising: an array substrate; a pixel drive circuit and an organic light-emitting element (TFT/OLED) on the array substrate; a passivation layer, consisting of a thin film based on an organosilicon compound, covering the pixel drive circuit and the organic light-emitting element (TFT/OLED) so as to block permeation of moisture; an adhesive layer on the passivation layer; a lower encapsulation layer under the array substrate; and a lower adhesive layer attaching the array substrate to the lower encapsulation layer, wherein the adhesive layer comprises a first adhesive layer formed of a resin having moisture absorbent material and attached to a surface of an encapsulation plate facing the array substrate and a second adhesive layer attached to a surface of the first adhesive layer, to the passivation layer, and to a part of the array substrate around the passivation layer, and wherein the second adhesive layer is formed of a transparent resin, wherein an amount of Si-CH 3 bonds in the passivation layer is less than 1/1000 of an amount of Si-O bonds in the passivation layer, wherein the organic light-emitting element includes an anode, an organic emission layer disposed only on the anode exposed via a hole of a bank and a cathode on the organic emission layer, wherein the passivation layer covers an upper surface and a side surfaces of the pixel drive circuit and the organic light-emitting element (TFT/OLED) and contacts with a part of the array substrate around the pixel drive circuit and the organic light-emitting element (TFT/OLED), and wherein the second adhesive layer covers an upper surface and the side surfaces of the passivation layer and contacts the part of the array substrate around the passivation layer. an array substrate; a pixel drive circuit and an organic light-emitting element (TFT/OLED) on the array substrate; a passivation layer, consisting of a thin film based on an organosilicon compound, covering the pixel drive circuit and the organic light-emitting element (TFT/OLED) so as to block permeation of moisture; an adhesive layer on the passivation layer; a lower encapsulation layer under the array substrate; and a lower adhesive layer attaching the array substrate to the lower encapsulation layer, wherein the adhesive layer comprises a first adhesive layer formed of a resin having moisture absorbent material and attached to a surface of an encapsulation plate facing the array substrate and a second adhesive layer attached to a surface of the first adhesive layer, to the passivation layer, and to a part of the array substrate around the passivation layer, and wherein the second adhesive layer is formed of a transparent resin, wherein an amount of Si-CH 3 bonds in the passivation layer is less than 1/1000 of an amount of Si-O bonds in the passivation layer, wherein the organic light-emitting element includes an anode, an organic emission layer disposed only on the anode exposed via a hole of a bank and a cathode on the organic emission layer, wherein the passivation layer covers an upper surface and a side surfaces of the pixel drive circuit and the organic light-emitting element (TFT/OLED) and contacts with a part of the array substrate around the pixel drive circuit and the organic light-emitting element (TFT/OLED), and wherein the second adhesive layer covers an upper surface and the side surfaces of the passivation layer and contacts the part of the array substrate around the passivation layer.