Display apparatus

1. A display apparatus comprising:

a substrate comprising a display area and a non-display area on a periphery of the display area;

a display device on the display area, the display device comprising a light-emitting device electrically connected to a thin film transistor; and

a first barrier wall on the non-display area, the first barrier wall surrounding the display area and comprising a first layer and a second layer;

wherein the first layer comprises a first portion having a first height from an upper surface of the substrate, and a second portion having a second height from the upper surface of the substrate that is less than the first height; and

wherein the second layer is on the second portion.

2. The display apparatus of claim 1 , further comprising:

a metal pattern layer disposed on the substrate, the metal pattern layer at least partially overlapping the first barrier wall.

3. The display apparatus of claim 2 , wherein the metal pattern layer has an embossed structure.

4. The display apparatus of claim 2 , wherein:

the display device further comprises a first planarization layer on the thin film transistor and a pixel defining layer on the first planarization layer, wherein the first planarization layer covers the thin film transistor and the pixel defining layer comprises an opening that defines a light-emitting region of the light-emitting device, and

the first layer comprises a same material as a material in the pixel defining layer.

5. The display apparatus of claim 4 , wherein the display device further comprises a spacer on the pixel defining layer and the second layer comprises a same material as a material in the spacer.

6. The display apparatus of claim 4 , wherein:

the display device further comprises a storage capacitor comprising a lower electrode and an upper electrode that overlaps the lower electrode,

the thin film transistor comprises an active layer and a gate electrode, and

the metal pattern layer comprises a same material as a material in the upper electrode.

7. The display apparatus of claim 6 , wherein the lower electrode and the gate electrode are integral with each other.

8. The display apparatus of claim 4 , wherein the first planarization layer extends towards the non-display area and comprises a first insulating layer in the non-display area.

9. The display apparatus of claim 8 , wherein the first barrier wall is on the non-display display area along a periphery of the display area and at least partially overlaps the first insulating layer.

10. The display apparatus of claim 1 , further comprising:

a second barrier wall arranged along a periphery of the display area, the second barrier wall spaced apart from the first barrier wall; and

a third barrier wall arranged along the periphery of the display area, the third barrier wall spaced apart from the second barrier wall.

11. The display apparatus of claim 10 , wherein:

the first barrier wall has a first width in a first direction that is parallel to the upper surface of the substrate and the second barrier will has a second width in the first direction that is less than the first width.

12. The display apparatus of claim 10 , wherein:

a top surface of the first barrier wall has a third height from the upper surface of the substrate and the third barrier wall has a fourth height from the upper surface of the substrate that is greater than the third height.

13. The display apparatus of claim 10 , further comprising a thin film encapsulation layer between the display device and the first barrier wall.

14. The display apparatus of claim 13 , wherein:

the thin film encapsulation layer comprises a first inorganic encapsulation layer;

a second inorganic encapsulation layer above the first inorganic encapsulation layer; and

an organic encapsulation layer between the first inorganic encapsulation layer and the second inorganic encapsulation layer.

15. The display apparatus of claim 14 , wherein the first inorganic encapsulation layer and the second inorganic encapsulation layer contact each other in a region between the first barrier wall and the second barrier wall.

16. The display apparatus of claim 14 , further comprising:

a touch unit directly on the second inorganic encapsulation layer,

wherein the touch unit comprises:

a sensing electrode in the display area; and

a signal line in the non-display area, the signal line is connected to the sensing electrode.

17. The display apparatus of claim 16 , wherein the sensing electrode comprises:

a first conductive layer;

a second conductive layer above the first conductive layer;

a first touch insulating layer between the first conductive layer and the second conductive layer; and

a second touch insulating layer on the second conductive layer.

18. The display apparatus of claim 17 , wherein the sensing electrode has a mesh shape.

19. The display apparatus of claim 1 , wherein an upper surface of the second layer has a fifth height from the upper surface of the substrate that is equal to or less than the first height.

20. A display apparatus comprising:

a substrate comprising a display area and a non-display area on a periphery of the display area;

a display device on the display area, the display device comprising a light-emitting device electrically connected to a thin film transistor;

a first barrier wall on the non-display area along a periphery of the display area, the first barrier wall comprising a first layer and a second layer, wherein the first layer comprises a first portion having a first height from an upper surface of the substrate and a second portion having a second height from the upper surface of the substrate that is less than the first height, and the second layer is on the second portion; and

a metal pattern layer above the substrate, the metal pattern layer at least partially overlapping the first barrier wall on the non-display area.