Organic light emitting display device and method for manufacturing the same

1. A method for manufacturing an organic light emitting display device, the method comprising:

forming a switching element and a silicon nitride layer over a substrate;

patterning and removing a portion of the silicon nitride layer formed on a light emitting region;

forming an overcoat layer on the silicon nitride layer, wherein a portion of the overcoat layer corresponding to the light emitting region has a thickness between about 1.1 μm and about 2.1 μm;

forming a first electrode over the light emitting region, the first electrode being electrically connected to the switching element;

forming an organic light emitting layer in the light emitting region; and

forming a second electrode on the organic light emitting layer,

wherein a light emitted from the organic light emitting layer exits to an exterior after passing through the overcoat layer and the substrate in the light emitting region where the silicon nitride layer is absent.

2. The method of claim 1 , wherein the overcoat layer is formed at a thickness of about 1.6 μm.

3. The method of claim 1 , wherein forming the switching element comprises:

forming a first thin film transistor electrically connected to a gate line and a power line with a first gate insulating layer interposed between the gate line and the power line; and

forming a second thin film transistor electrically connected to the gate line and a data line with a second gate insulating layer interposed between the gate line and the data line.

4. The method of claim 3 , wherein forming the switching element further comprises forming a passivation film to protect the switching element.

5. The method of claim 4 , wherein forming the passivation film further comprises patterning and removing a portion of the silicon nitride layer having the passivation film and the first and second gate insulating layers which overlaps the light emitting region.

6. The method of claim 5 , further comprising forming a color filter in red, green, blue and white sub-pixels after forming the passivation film.

7. The method of claim 6 , wherein forming the color filter comprises forming red, green and blue color filters below the organic light emitting layer.

8. An organic light emitting display device, comprising:

a substrate having a first region and a second region which are divided for each pixel;

a switching element disposed on the first region of the substrate;

a silicon nitride layer disposed on the switching element in the first region;

an overcoat layer disposed on the silicon nitride layer and the second region of the substrate; and

an organic light emitting portion that emits light and is disposed on a portion of the overcoat layer corresponding to the second region, the organic light emitting portion being electrically connected to the switching element,

wherein the light exits to an exterior after passing through the overcoat layer and the substrate in the second region where the silicon nitride layer is absent.

9. The organic light emitting display device of claim 8 , wherein the overcoat layer has a thickness between about 1.1 μm and about 2.1 μm.

10. The organic light emitting display device of claim 9 , wherein the overcoat layer has a thickness of 1.6 μm.

11. The organic light emitting display device of claim 9 , wherein the organic light emitting portion comprises a first electrode, an organic light emitting layer and a second electrode sequentially formed on the overcoat layer.

12. The organic light emitting display device of claim 11 , further comprising a color filter formed on the substrate below the organic light emitting layer.

13. The organic light emitting display device of claim 12 , wherein the pixel comprises red, green, blue, and white sub-pixels.

14. The organic light emitting display device of claim 12 , wherein the pixel comprises red, green, and blue sub-pixels.

15. The organic light emitting display device of claim 8 , wherein the overcoat layer is made of an acrylic-based material.

16. The organic light emitting display device of claim 15 , wherein the overcoat layer is made of polyacrylate.