Composite sheet and display device comprising the same

1. A display device, comprising:

a display panel;

a bottom cover configured to accommodate the display panel; and

a composite sheet disposed between the display panel and the bottom cover and comprising:

a buffer sheet comprising a through hole; and

a heat-dissipating sheet disposed in the through hole,

wherein the heat-dissipating sheet is disposed in a first region of the through hole and an air layer is disposed in a second region of the through hole.

2. The display device of claim 1 , wherein a thickness of the heat-dissipating sheet is less than 50% of a depth of the through hole.

3. The display device of claim 2 , wherein the composite sheet further comprises a metal sheet directly contacting the buffer sheet and the heat-dissipating sheet.

4. The display device of claim 1 , wherein the buffer sheet comprises an elastic polymer sheet.

5. The display device of claim 1 , wherein the heat-dissipating sheet comprises a graphite sheet or a graphene sheet.

6. The display device of claim 3 , wherein the metal sheet comprises a copper sheet.

7. The display device of claim 1 , further comprising a driving circuit board disposed between the bottom cover and the composite sheet and configured to drive the display panel.

8. A composite sheet, comprising:

a buffer sheet comprising a plurality of through holes in an elastic material; and

heat-dissipating members disposed in each through hole,

wherein each heat-dissipating member is disposed in a first region of each through hole and an air layer is disposed in a second region of each through hole.

9. The composite sheet of claim 8 , further comprising a metal plate deposited on the buffer sheet.

10. The composite sheet of claim 9 , wherein the metal plate covers a surface of the composite sheet and directly contacts the buffer sheet and the heat-dissipating members.

11. The composite sheet of claim 8 , wherein a thickness of the heat-dissipating members is less than 50% of a thickness of the buffer sheet.

12. The composite sheet of claim 8 , wherein the elastic material is a foam polymer.

13. The composite sheet of claim 8 , wherein the heat-dissipating members comprise graphite or graphene.

14. The composite sheet of claim 9 , wherein the metal plate comprises copper.

15. A composite sheet, comprising:

a buffer sheet formed of polymer foam and comprising a plurality of grooves formed on a top surface thereof; and

a heat-dissipating sheet disposed in each of the plurality of grooves such that a top surface of each heat-dissipating sheet is on a level with the top surface of the buffer sheet.

16. The composite sheet of claim 15 , wherein a thickness of each heat-dissipating sheet is less than 50% of a thickness of the buffer sheet.

17. The composite sheet of claim 15 , wherein the plurality of grooves are parallel.