Organic light emitting display device

1. A flexible organic light emitting device comprising:

a flexible substrate having an active area and a pad area;

an organic light emitting diode layer disposed on the active area;

an adhesive layer disposed on the organic light emitting diode layer;

an encapsulation substrate disposed on the adhesive layer;

a cover layer disposed between the active area and the pad area; and

a back film disposed on a lower surface of the flexible substrate,

wherein the encapsulation substrate has a curved upper surface outside the active area,

wherein the cover layer decreases in thickness from the active area toward the pad area, and

wherein the curved upper surface of the encapsulation substrate outside the active area is lower near the cover layer and higher at the active area.

2. The flexible organic light emitting device of claim 1 , wherein the cover layer is coated on the flexible substrate.

3. The flexible organic light emitting device of claim 1 , wherein the cover layer is disposed lower than the encapsulation substrate.

4. The flexible organic light emitting device of claim 1 , wherein the cover layer is sloped from a first portion to a second portion.

5. The flexible organic light emitting device of claim 1 , wherein the cover layer comprises a curved portion.

6. The flexible organic light emitting device of claim 1 , wherein a length of the encapsulation substrate is increased outside the active area.

7. The flexible organic light emitting device of claim 1 , wherein the back film is supporting the flexible substrate.

8. A flexible organic light emitting device comprising:

a flexible substrate having an active area and a pad area;

an organic light emitting diode layer disposed on the active area;

an adhesive layer disposed on the organic light emitting diode layer;

an encapsulation substrate disposed on the adhesive layer;

a cover layer disposed between the active area and the pad area; and

a back film disposed on a lower surface of the flexible substrate,

wherein the encapsulation substrate has a curved upper surface outside the active area,

wherein the cover layer decreases in thickness from the active area toward the pad area, and

wherein the cover layer contacts the adhesive layer outside the active area.

9. A flexible organic light emitting device comprising:

a flexible substrate having an active area and a pad area;

an organic light emitting diode layer disposed on the active area;

an adhesive layer disposed on the organic light emitting diode layer;

an encapsulation substrate disposed on the adhesive layer;

a cover layer disposed between the active area and the pad area; and

a back film disposed on a lower surface of the flexible substrate,

wherein the encapsulation substrate has a curved upper surface outside the active area,

wherein the cover layer decreases in thickness from the active area toward the pad area, and

wherein the cover layer is higher than a lower portion of the adhesive layer at the outside of the active area.

10. A flexible organic light emitting device comprising:

a flexible base substrate having an active area and a pad area;

a thin film transistor disposed on the active area;

an organic light emitting diode layer disposed on the active area;

an encapsulation film disposed on the thin film transistor and the organic light emitting diode layer to protect the thin film transistor and the organic light emitting diode layer;

a cover layer disposed between the active area and the pad area; and

a back film disposed on a lower surface of the flexible base substrate,

wherein the cover layer includes a first portion adjacent to the active area and a second portion adjacent to the pad area, the first portion being thicker than the second portion,

wherein the pad area is spaced from the active area by a first distance, and

wherein the cover layer extends an entirety of the first distance from the active area to the pad area.

11. The flexible organic light emitting device of claim 10 , wherein the encapsulation film is a metal film type.

12. The flexible organic light emitting device of claim 10 , wherein the encapsulation film has different thickness at the active area and outside the active area.

13. The flexible organic light emitting device of claim 10 , wherein the cover layer decreases in thickness from the active area toward the pad area.

14. The flexible organic light emitting device of claim 10 , wherein the cover layer is sloped from the first portion to the second portion.

15. The flexible organic light emitting device of claim 10 , wherein the cover layer comprises a curved portion.

16. The flexible organic light emitting device of claim 10 , wherein the encapsulation film is fully covering a side of the organic light emitting diode layer.