Accordingly, the organic light emitting display device 100 according to the exemplary embodiment of the present disclosure may implement a structure for securing environmental reliability performance of a product by using double polyimides (PI) as a substrate. For example, as shown in FIG. 4, the substrate 110 of the organic light emitting display device 100 may include a first polyimide layer 110a, a second polyimide layer 110c, and an inorganic insulating layer 110b formed between the first polyimide layer 110a and the second polyimide layer 110c, but is not limited thereto. In a case in which electric charges are charged in the first polyimide layer 110a, the inorganic insulating layer 110b may serve to block the electric charge from affecting the first thin film transistor 120 through the second polyimide layer 110b. In addition, the inorganic insulating layer 110b may serve to block a moisture component from passing through the first polyimide layer 110b and penetrating upwardly.
