Display device and fabricating method thereof

1. A display device comprising:

a substrate including a display region in which a plurality of pixels are provided and a non-display region surrounding at least one side of the display region;

a display element layer including a light emitting element provided in each of the pixels;

a pad provided in at least a portion of the non-display region of the substrate, the pad having a test signal supplied thereto; and

a touch sensor disposed on the display element layer,

wherein:

the touch sensor includes:

a base layer disposed on the display element layer;

a first conductive pattern disposed on the base layer;

a first insulating layer provided over the first conductive pattern;

a second conductive pattern disposed on the first insulating layer;

a second insulating layer provided over the second conductive pattern;

an intermediate layer disposed on the base layer to correspond to the pad; and

a cover layer disposed over the intermediate layer;

the intermediate layer and the cover layer include different materials; and

the intermediate layer is provided in a shape filling an opening exposing at least a portion of the pad.

2. The display device of claim 1 , wherein the intermediate layer includes an organic insulating material, and the cover layer includes a conductive material.

3. The display device of claim 1 , the intermediate layer is disposed on the display element layer to correspond to the pad.

4. The display device of claim 3 , wherein the cover layer completely covers the intermediate layer.

5. The display device of claim 4 , wherein each of both end portions of the intermediate layer is spaced apart from each of both end portions of the cover layer at a certain distance.

6. The display device of claim 5 , wherein each of both the end portions of the intermediate layer is located inward of each of both the end portions of the cover layer.

7. The display device of claim 4 , wherein:

the first conductive pattern includes a plurality of first bridge patterns disposed on the base layer;

the second conductive pattern includes:

a plurality of first sensor patterns disposed on the first insulating layer, the plurality of first sensor patterns extending in a first direction and being connected to each other by the plurality of first bridge patterns;

a plurality of second sensor patterns disposed on the first insulating layer, the plurality of second sensor patterns extending in a second direction different from the first direction, the plurality of second sensor patterns being spaced apart from the first sensor patterns; and

a plurality of second bridge patterns connecting the second sensor patterns.

8. The display device of claim 7 , wherein the cover layer is provided on the same layer as the first bridge patterns and includes the same material as the first bridge patterns.

9. The display device of claim 7 , wherein the cover layer includes:

a first cover layer provided in the same layer as the first bridge patterns, the first cover layer including the same material as the first bridge patterns; and

a second cover layer provided in the same layer as the first and second sensor patterns and the second bridge patterns, the second cover layer including the same material as the first and second sensor patterns and the second bridge patterns.

10. The display device of claim 7 , further comprising a pixel circuit layer disposed between the substrate and the display element layer.

11. The display device of claim 10 , wherein the pixel circuit layer includes at least one transistor disposed on the substrate and a passivation layer covering the transistor,

wherein the display element layer further includes a pixel defining layer disposed on the passivation layer, the pixel defining layer defining an emission region of each of the pixels.

12. The display device of claim 11 , wherein the opening includes:

a first opening penetrating the passivation layer in the non-display region and exposing the pad; and

a second opening penetrating the pixel defining layer in the non-display region and exposing the pad,

wherein a width of the first opening and a width of the second opening are different from each other.

13. The display device of claim 12 , wherein, when viewed on a section, both side surfaces of the first opening are located inward of both side surfaces of the second opening.

14. The display device of claim 13 , wherein the intermediate layer is provided in a shape filling the first and second openings.

15. A method of fabricating a display device, the method comprising:

providing a substrate including a display region and a non-display region;

forming a plurality of transistors in the display region, and forming a pad having a test signal supplied thereto in at least a portion of the non-display region;

forming a passivation layer over the transistors and the pad, the passivation layer including a first opening exposing at least a portion of the pad;

forming a display element layer including a pixel defining layer and light emitting elements on the passivation layer, the pixel defining layer including a second opening exposing at least a portion of the pad; and

forming a touch sensor on the display element layer,

wherein:

the forming of the touch sensor includes:

forming a base layer on the display element layer;

forming an intermediate layer on the base layer to correspond to the pad;

forming first bridge patterns on the base layer corresponding to the display region, and forming a cover layer over the intermediate layer;

forming a first insulating layer over the first bridge patterns and the cover layer;

forming a plurality of first sensor patterns, a plurality of second sensor patterns, and a plurality of second bridge patterns on the first insulating layer corresponding to the display region; and

forming a second insulating layer over the first sensor patterns, the second sensor patterns, and the second bridge patterns;

the cover layer is provided in a shape completely covering the intermediate layer; and

the intermediate layer is provided in a shape filling the first and second openings.

16. The method of claim 15 , wherein the intermediate layer includes an organic insulating material, and the cover layer includes a conductive material.

17. The method of claim 16 , wherein the forming of the cover layer includes:

forming a conductive layer on the intermediate layer;

forming, on the conductive layer, a photosensitive pattern including an opening exposing one region of the conductive layer;

removing the exposed region of the conductive layer by performing an etching process, using the photosensitive pattern as a mask; and

removing the photosensitive pattern.

18. The method of claim 17 , wherein each of both end portions of the intermediate layer is spaced apart from each of both end portions of the cover layer at a certain distance.

19. The method of claim 18 , wherein each of both the end portions of the intermediate layer is located inward of the each of both the end portions of the cover layer.