OLED with a flattening layer between two barrier layers

1. An organic electroluminescent display device comprising:

a substrate comprising an active area in which a plurality of organic electroluminescent light emitting elements are disposed, and an outside area surrounding the active area;

a first insulating layer formed on the substrate;

a second insulating layer formed on the first insulating layer;

a third insulating layer formed on the substrate and delimiting the plurality of organic electroluminescent light emitting elements and including a sloped surface at a border between the active area and the outside area extending from the active area to the outside area;

wherein in the outside area;

the first insulating layer comprises a first flat surface at the border between the active area and the outside area, an inclined surface extending from the first flat surface, and a second flat surface extending from the inclined surface;

an organic layer is located between the first insulating layer and the second insulating layer at, a boundary portion between the inclined surface and the second flat surface of the first insulating layer; and

the inclined surface of the first insulating layer is on the sloped surface of the third insulating layer and is contoured in accordance with a shape of the third insulating layer;

the first insulating layer is in contact with the second insulating layer on the first flat surface of the first insulating layer.

2. The device of claim 1 , wherein the first insulating layer includes at least one of silicon nitride, silicon oxide, and silicon oxynitride.

3. The device of claim 1 , wherein the second insulating layer includes at least one of silicon nitride, silicon oxide, and silicon oxynitride.

4. The device of claim 1 , wherein the third insulating layer has a convex shape.

5. The device of claim 1 , wherein the third insulating layer has the sloped surface at the outside area, and the inclined surface of the first insulating layer is attributable to the sloped surface of the third insulating layer.

6. The device of claim 1 , wherein the third insulating layer has the sloped surface at the outside area.

7. The device of claim 4 , wherein at least one side surface of the convex shape is the sloped surface of the third insulating layer.

8. The device of claim 5 , wherein the inclined surface of the first insulating layer is on the sloped surface of the third insulating layer.

9. The device of claim 1 , wherein the third insulating layer is disposed between the substrate and the first insulating layer.

10. An organic electroluminescent display device comprising:

a substrate comprising an active area in which a plurality of organic electroluminescent light emitting elements are disposed, and an outside area surrounding the active area;

a rib layer formed on the substrate and delimiting the plurality of organic electroluminescent light emitting elements and including a rib structure at a border between the active area and the outside area extending from the active area to the outside area, the rib structure has a sloped surface at the outside area;

a first barrier layer formed on the rib structure;

a second barrier layer formed on the first barrier layer;

wherein in the outside area;

the first barrier layer comprises a first flat surface at the border between the active area and the outside area, an inclined surface on the sloped surface of the rib structure extending from the first flat surface, and a second flat surface extending from the inclined surface;

a flattening layer is located between the first barrier layer and the second barrier layer at a boundary portion between the inclined surface and the second flat surface of the first barrier layer; and

the first barrier layer is in contact with the second barrier layer on the first flat surface of the first barrier layer.

11. The device of claim 10 , wherein the flattening layer is formed of an organic film.

12. The device of claim 10 , wherein the rib structure has a convex shape.

13. The device of claim 12 , wherein at least one side surface of the convex shape is the sloped surface of the rib structure.

14. The device of claim 13 , wherein at least one side surface of the convex shape is the sloped surface of the rib structure at the outside area.