Display apparatus

1. A display apparatus comprising:

a base substrate including a display area, a non-display area and a stepped portion;

a buffer layer provided on the base substrate;

a pixel array layer provided on the buffer layer;

an encapsulation substrate provided on the pixel array layer; and

a cover layer provided on the non-display area and covering a side surface of the encapsulation substrate,

wherein the buffer layer covers the stepped portion of the base substrate,

wherein the base substrate comprises:

a first substrate;

a heat dissipation layer provided on the first substrate; and

a second substrate provided on the heat dissipation layer,

wherein the first substrate has a surface area greater than surface areas of the second substrate and the heat dissipation layer, and

wherein the buffer layer covers a side surface of the second substrate and a side surface of the heat dissipation layer.

2. The display apparatus of claim 1 , wherein the cover layer covers a side surface of the buffer layer.

3. The display apparatus of claim 1 , further comprising a data pad part provided on a portion of the buffer layer,

wherein the cover layer contacts a side surface of the data pad part.

4. The display apparatus of claim 3 , wherein the cover layer comprises:

a first cover part covering edges of the buffer layer, except one edge including the data pad part;

a second cover part contacting a first side portion of the data pad part; and

a third cover part contacting a second side portion of the data pad part.

5. The display apparatus of claim 4 , wherein the first cover part covers a side surface of the encapsulation substrate and a side surface of the buffer layer.

6. The display apparatus of claim 4 , wherein the second cover part covers a side surface of the encapsulation substrate, and the third cover part covers a side surface of the buffer layer.

7. A rollable display system comprising:

a roller; and

the display apparatus according to claim 1 .

8. The rollable display system of claim 7 , further comprising a gate driver provided in a side portion of the display apparatus, the side portion not being parallel to a lengthwise direction of the roller.

9. A display apparatus comprising:

a base substrate including a first substrate, a heat dissipation layer provided on the first substrate, and a second substrate, the second substrate extending toward, but short of, an edge of the first substrate, and the second substrate extending toward an edge of the heat dissipation layer;

a buffer layer on a top surface of the second substrate and covering a side surface of the second substrate and a side surface of the heat dissipation layer;

a pixel array layer on the buffer layer;

an encapsulation substrate on the pixel array layer;

a cover layer covering side surfaces of the encapsulation substrate and the buffer layer; and

a data pad part on a portion of the buffer layer,

wherein the cover layer contacts a side surface of the data pad part.

10. The display apparatus of claim 9 , wherein the buffer layer extends toward the edge of the first substrate further than the second substrate extending toward the edge of the first substrate.

11. The display apparatus of claim 9 , wherein the cover layer comprises:

a first cover part covering a plurality of edges of the buffer layer, except one edge including the data pad part, the first cover part covering the side surfaces of the encapsulation substrate and the buffer layer;

a second cover part contacting a first side portion of the data pad part and covering the side surface of the encapsulation substrate; and

a third cover part contacting a second side portion of the data pad part and covering the side surface of the buffer layer.

12. A rollable display system comprising:

a roller; and

the display apparatus according to claim 9 ,

wherein the display apparatus is configured to be rolled to the roller.

13. The rollable display system of claim 12 , further comprising a gate driver provided in a side portion of the display apparatus, the side portion not being parallel to a lengthwise direction of the roller.