Display device

1. A display device comprising:

a display panel including a front surface at which an image is displayed and a rear surface which is opposite to the front surface;

a circuit board connected to the display panel and facing the rear surface of the display panel; and

a heat dissipation layer between the rear surface of the display panel and the circuit board, the heat dissipation layer comprising:

a first heat dissipation sheet electrically connected to the circuit board; and

a second heat dissipation sheet spaced apart from the first heat dissipation sheet in a direction along the display panel.

2. The display device of claim 1 , wherein the first heat dissipation sheet is electrically insulated from the second heat dissipation sheet.

3. The display device of claim 1 , wherein the circuit board faces the display panel with the first heat dissipation sheet therebetween.

4. The display device of claim 3 , wherein

each of the first heat dissipation sheet and the circuit board has a planar shape, and

the planar shape of the first heat dissipation sheet corresponds to the planar shape of the circuit board.

5. The display device of claim 1 , wherein

the display panel comprises a bending portion at which the display panel is bendable, and a flat portion which extends from the bending portion, and

the display panel which is bent at the bending portion disposes the bending portion to face the flat portion.

6. The display device of claim 5 , further comprising a driving chip disposed on the bending portion of the display panel, and

the display panel which is bent at the bending portion disposes a portion of the bending portion and the driving chip each facing the first heat dissipation sheet.

7. The display device of claim 1 , further comprising a flexible circuit film which is bendable and electrically connects the display panel and the circuit board to each other,

wherein the flexible circuit film includes a driving chip.

8. The display device of claim 7 , wherein the driving chip is disposed on the flexible circuit film which is bent and faces the first heat dissipation sheet.

9. The display device of claim 1 , wherein

the circuit board which faces the rear surface of the display panel comprises a ground line, and

the first heat dissipation sheet is electrically connected to the ground line of the circuit board.

10. The display device of claim 9 , further comprising a conductive adhesive film which electrically connects the first heat dissipation sheet and the ground line of the circuit board to each other.

11. The display device of claim 10 , wherein the circuit board comprises:

a cover layer between the ground line and the conductive adhesive film;

an opening which is defined through the cover layer and exposes a portion of the ground line to outside the cover layer to define an exposed portion of the ground line; and

a step difference compensation pattern which is in the opening and electrically connects the conductive adhesive film to the exposed portion of the ground line.

12. The display device of claim 11 , wherein the step difference compensation pattern forms an interface with both the conductive adhesive film and the exposed portion of the ground line.

13. The display device of claim 9 , further comprising:

a first conductive adhesive film which electrically connects the first heat dissipation sheet and the ground line of the circuit board to each other; and

a second conductive adhesive film which electrically connects the second heat dissipation sheet and the ground line of the circuit board to each other,

wherein the second heat dissipation sheet is electrically connected to the circuit board.

14. The display device of claim 13 , wherein

the second heat dissipation sheet is spaced apart from the first heat dissipation sheet in the direction along the display panel, by a gap,

the first conductive adhesive film and the second conductive adhesive film are spaced apart from each other in the direction along the display panel, by the gap, and

the first conductive adhesive film faces the display panel with the first heat dissipation sheet therebetween, and the second conductive adhesive film faces the display panel with the second heat dissipation sheet therebetween.

15. The display device of claim 1 , wherein the first heat dissipation sheet and the second heat dissipation sheet comprise a same metal material as each other.

16. The display device of claim 15 , wherein the first heat dissipation sheet and the second heat dissipation sheet comprise copper.

17. The display device of claim 1 , wherein the first heat dissipation sheet and the second heat dissipation sheet comprise different metal materials from each other.

18. The display device of claim 1 , wherein

the first heat dissipation sheet and the second heat dissipation sheet each comprises a material having an electrical conductivity, and

the electrical conductivity of the material of the first heat dissipation sheet is higher than the electrical conductivity of the material of the second heat dissipation sheet.

19. The display device of claim 1 , further comprising a cover panel between the display panel and the circuit board,

wherein the cover panel comprises:

the heat dissipation layer having the second heat dissipation sheet which is spaced apart from the first heat dissipation sheet in the direction along the display panel;

a first layer between the display panel and the heat dissipation layer; and

a second layer between the first layer and the display panel.

20. The display device of claim 19 , wherein the second layer of the cover panel comprises:

an embossed layer comprising a plurality of protrusions protruding towards the display panel, and

a cushion layer facing the display panel with the embossed layer therebetween.