Display device with touch sensor having protrusions and depressions

1. A display device, comprising:

a display panel comprising:

a substrate;

a display unit comprising a pixel and a non-pixel area disposed on the substrate; and

an encapsulation layer covering the display unit; and

a touch sensor comprising:

detection electrodes disposed on the display panel; and

a passivation layer covering the detection electrodes,

wherein the passivation layer comprises a surface protrusion and depression portion overlapping the non-pixel area, and,

wherein a width of the surface protrusion and depression portion is greater than a width of each detection electrode, and is smaller than or equal to a width of the non-pixel area.

2. The display device of claim 1 , wherein the surface protrusion and depression portion comprises depressions and protrusions having a size of several micrometers.

3. The display device of claim 1 , wherein the detection electrodes have a mesh shape and are disposed on non-pixel areas.

4. The display device of claim 1 , wherein:

the touch sensor further comprises a touch area configured to sense a touch; and

an area of the entire surface protrusion and depression portion is about half or more of the touch area.

5. The display device of claim 1 , wherein:

the passivation layer further comprises a multilayer; and

the surface protrusion and depression portion is disposed on an uppermost layer of the multilayer.

6. The display device of claim 1 , wherein:

the pixel comprises an organic light emitting diode and a driving circuit unit; and

the organic light emitting diode comprises a pixel electrode, an emission layer, and a common electrode.

7. The display device of claim 6 , wherein:

the encapsulation layer comprises a capping layer, a first inorganic layer, an organic layer, and a second inorganic layer sequentially disposed on the common electrode; and

the detection electrodes are disposed directly on the encapsulation layer.

8. The display device of claim 1 , wherein the detection electrodes comprise:

a first detection electrode comprising first detection cells disposed in a first direction; and

a second detection electrode comprising second detection cells disposed in a second direction crossing the first direction.

9. The display device of claim 8 , wherein:

the passivation layer further comprises a first passivation layer covering the first detection electrode and a second passivation layer covering the second detection electrode; and

the second detection electrode is disposed on the first passivation layer.

10. The display device of claim 9 , wherein the surface protrusion and depression portion is disposed on the second passivation layer.

11. The display device of claim 9 , wherein:

the touch sensor further comprises a first auxiliary electrode disposed on the first passivation layer, the first auxiliary electrode overlapping a first detection cell of the first detection cells; and

the first passivation layer comprises a first contact hole through which the first detection cell is electrically connected to the first auxiliary electrode.

12. The display device of claim 11 , wherein the first auxiliary electrode has an isolated cell shape and is spaced apart from the second detection electrode.

13. The display device of claim 12 , wherein:

the touch sensor further comprises a second auxiliary electrode overlapping a second detection cell of the second detection cells, the second auxiliary electrode disposed on the encapsulation layer; and

the first passivation layer further comprises a second contact hole through which the second detection cell is electrically connected to the second auxiliary electrode.

14. The display device of claim 13 , wherein the second auxiliary electrode has an isolated cell shape and is spaced apart from the first detection electrode.

15. The display device of claim 14 , wherein:

the first detection electrode and the second auxiliary electrode are disposed on the same layer and comprise the same material; and

the second detection electrode and the first auxiliary electrode are disposed on the same layer and comprise the same material.

16. A method of forming a display device, the method comprising:

forming a display unit on a substrate, the display unit comprising pixels and non-pixel areas disposed between the pixels;

forming an encapsulation layer on the display unit;

forming a first detection electrode on the encapsulation layer, the first detection electrode disposed in a first direction;

forming a first passivation layer covering the first detection electrode and the encapsulation layer;

forming a second detection electrode on the first passivation layer, the second detection electrode disposed in a second direction crossing the first direction;

forming a second passivation layer covering the second detection electrode and the first passivation layer; and

forming surface protrusion and depression portions on the second passivation layer,

wherein the surface protrusion and depression portions overlap only the non-pixel areas, and

wherein a width of each surface protrusion and depression portion is greater than a width of each of the first and second detection electrodes and smaller or equal to a width of each non-pixel areas.

17. The method of claim 16 , further comprising:

forming a second auxiliary electrode on the encapsulation layer; and

forming a first auxiliary electrode on the first passivation layer; and

forming a first contact hole and a second contact hole penetrating the first passivation layer; and

electrically connecting the first detection electrode to the second auxiliary electrode via the first contact hole and the second detection electrode to the first auxiliary electrode via the second contact hole.

18. The method of claim 17 , wherein:

the first auxiliary electrode and the second detection electrode overlap each other and comprise the same material; and

the second auxiliary electrode and the first detection electrode overlap each other and comprise the same material.