Electroluminescence display device having a through-hole in display area

1. An electroluminescence display device comprising:

a substrate having a display area and a non-display area arranged near the display area;

a light emitting diode in the display area;

an encapsulation layer on the light emitting diode;

a through-hole arranged inside the display area to penetrate the substrate;

an inner dam surrounding the through-hole;

a trench arranged between the inner dam and the through-hole;

an etch-stopper arranged between the trench and the through-hole; and

an upper passivation film disposed on the display area and covering the inner dam, the trench and an upper surface of the etch-stopper.

2. The electroluminescence display device of claim 1 , further comprising an insulating layer on which the etch-stopper is arranged,

wherein the insulating layer is disposed on the display area and passing below the inner dam and the trench except the through-hole.

3. The electroluminescence display device of claim 2 , wherein the trench includes a recessed portion recessed to reach an upper surface of the substrate between the through-hole and the inner dam.

4. The electroluminescence display device of claim 3 , wherein the trench includes:

a bottom surface defined by the upper surface of the substrate exposed by the recessed portion of the trench;

an upper surface defined on the uppermost surface near the recessed portion of the trench; and

a sidewall connecting the bottom surface of the trench with the upper surface of the trench, and

wherein a dummy light emitting layer of the light emitting diode is disposed on the bottom surface of the trench.

5. The electroluminescence display device of claim 4 , wherein a light emitting layer is disposed on the upper surface of the trench.

6. The electroluminescence display device of claim 4 , wherein a dummy common electrode is disposed on the dummy light emitting layer and comes into contact with the sidewall of the trench.

7. The electroluminescence display device of claim 4 , wherein the sidewall of the trench has a saw-tooth shape due to a difference in an etching rate of thin film layers exposed to the sidewall of the trench.

8. The electroluminescence display device of claim 4 , wherein the insulating layer includes a first insulating film and a second insulating film, and

wherein an interval between the sidewall defined by the first insulating film is larger than an interval between the sidewall defined by the second insulating film.

9. The electroluminescence display device of claim 1 , wherein the display area includes pixels having the light emitting diode for expressing image information and a driving element for driving the light emitting diode, the pixels being arranged in a matrix arrangement, and

wherein the through-hole is an area where the substrate, the light emitting diode and the driving element are not provided.

10. The electroluminescence display device of claim 1 , wherein the encapsulation layer comprises a first inorganic encapsulation layer, a second inorganic encapsulation layer and an organic encapsulation layer disposed between the first and second inorganic encapsulation layers.

11. The electroluminescence display device of claim 10 , wherein the first inorganic encapsulation layer and the second inorganic encapsulation layer are configured to be a thin film layer covering the inner dam and the trench in the display area.

12. The electroluminescence display device of claim 11 , wherein the thin film layer further comprises a light emitting layer of the light emitting diode.

13. The electroluminescence display device of claim 12 , wherein an end of the insulating layer is arranged between an end of the thin film layer and an end of the through-hole.

14. The electroluminescence display device of claim 13 , wherein the end of the insulating layer is disposed closer to the through-hole than an end of the etch-stopper, and

wherein the end of the etch-stopper is disposed closer to the through-hole than an end of the first inorganic encapsulation layer.

15. The electroluminescence display device of claim 14 , wherein the upper passivation film covers a side surface of the etch-stopper adjacent to the through-hole and a part of the upper surface of the etch-stopper.

16. The electroluminescence display device of claim 15 , wherein the upper passivation film covers stepped portions formed by the thin film layer, the etch stopper and the insulating layer.

17. The electroluminescence display device of claim 12 , wherein the light emitting layer covers a part of the etch-stopper in the display area, and is disconnected at the trench,

wherein the first inorganic encapsulation layer and the second inorganic encapsulation layer cover one portion of the etch stopper in the display area, and

wherein the upper passivation film covers the second inorganic encapsulation layer, the first inorganic encapsulation layer, a common electrode, the light emitting layer and the etch stopper.

18. The electroluminescence display device of claim 11 , wherein the thin film layer covers a part of the upper surface of the etch-stopper.

19. The electroluminescence display device of claim 1 , wherein the upper passivation film reaches to an end of the through-hole.

20. The electroluminescence display device of claim 1 , further comprising a touch electrode disposed on the upper passivation film.

21. The electroluminescence display device of claim 1 , wherein the etch-stopper is composed of organic materials.