Display device

1. A display device comprising:

a display panel including a pixel region; and

an input sensing sensor disposed on the display panel, wherein the input sensing sensor includes:

a first conductive layer disposed on the display panel;

a first insulation layer disposed on the display panel, wherein the first insulation layer covers the first conductive layer and has a first opening defined in a region overlapping the pixel region;

a second conductive layer disposed on the first insulation layer;

a second insulation layer disposed on the first insulation layer, wherein the second insulation layer covers the second conductive layer and has a second opening defined in the region overlapping the pixel region, wherein the first insulation layer is interposed between the second insulation layer and the display panel; and

a third insulation layer disposed on the second insulation layer and that completely fills each of the first opening and the second opening,

wherein the first opening is fully exposed by the second opening.

2. The display device of claim 1 , wherein the first insulation layer has a first refractive index, the second insulation layer has a second refractive index, and the third insulation layer has a third refractive index which is higher than the first refractive index and the second refractive index.

3. The display device of claim 1 , wherein an area of the first opening is smaller than an area of the second opening on a plane.

4. The display device of claim 1 , wherein an area of the first opening is the same as or larger than an area of the pixel region on a plane.

5. The display device of claim 1 , wherein a side surface of the first insulation layer defining the first opening is surrounded by a side surface of the second insulation layer defining the second opening on a plane.

6. The display device of claim 1 , wherein the first conductive layer comprises a connecting part and the second conductive layer comprises sensor parts.

7. The display device of claim 6 , wherein each of the sensor parts has a mesh shape, each of the sensor parts has a sensor opening defined on a plane, and the sensor opening overlaps the first opening and the second opening.

8. The display device of claim 1 , wherein each of a first refractive index of the first insulation layer and a second refractive index of the second insulation layer are each 1.45 to 1.55, and a third refractive index of the third insulation layer is 1.60 to 1.70.

9. The display device of claim 1 , wherein the display panel comprises: a base layer; a circuit layer disposed on the base layer; a light emitting layer disposed on the circuit layer; and an encapsulation layer disposed on the light emitting layer, and the input sensing sensor is disposed in direct contact with the encapsulation layer.

10. The display device of claim 9 , wherein the input sensing sensor further comprises a buffer layer which is in direct contact with the encapsulation layer, and the buffer layer is disposed between the encapsulation layer and the first conductive layer.

11. A display device comprising:

a display panel including a pixel region;

a first insulation layer disposed on the display panel, having a first refractive index, and having a first opening defined in a region overlapping the pixel region;

a second insulation layer disposed on the first insulation layer, having a second refractive index, and having a second opening bigger than the first opening in a region corresponding to the first opening, and wherein the first insulation layer is interposed between the second insulation layer and the display panel; and

a third insulation layer covering the display panel, the first insulation layer, and the second insulation layer and having a third refractive index higher than the first refractive index and the second refractive index, and the third insulation layer overlaps the pixel region on a plane.

12. The display device of claim 11 , further comprising:

a first conductive layer disposed between the display panel and the first insulation layer; and

a second conductive layer disposed between the first insulation layer and the second insulation layer.

13. The display device of claim 12 , further comprising a fourth insulation layer disposed between the first insulation layer and the second conductive layer and having a refractive index lower than the third refractive index,

wherein a third opening bigger than the first opening and smaller than the second opening is defined in the fourth insulation layer.

14. The display device of claim 12 , wherein the first conductive layer comprises a connecting part and the second conductive layer comprises sensor parts.

15. The display device of claim 14 , wherein each of the sensor parts has a mesh shape, and the sensor parts do not overlap the pixel region on a plane.

16. The display device of claim 14 , wherein each of the sensor parts has a mesh shape, the sensor parts have a sensor opening defined on a plane, and the sensor opening overlaps the first opening and the second opening.

17. The display device of claim 11 , further comprising a fourth insulation layer disposed between the second insulation layer and the third insulation layer and having a refractive index lower than the third refractive index,

wherein a third opening larger than the second opening is defined in the fourth insulation layer.

18. The display device of claim 11 , wherein a side surface of the first insulation layer defining the first opening is surrounded by a side surface of the second insulation layer defining the second opening on a plane.

19. The display device of claim 11 , wherein the first refractive index and the second refractive index are each 1.45 to 1.55, and the third refractive index is 1.60 to 1.70.

20. The display device of claim 11 , wherein the third insulation layer completely fills each of the first opening and the second opening.