Liquid crystal display having an LED and a thermal conductive sheet

• US 20060221574A1
• Filed: 03/16/2006
• Published: 10/05/2006
• Est. Priority Date: 03/29/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Joo-woan, Kim, Gi-cherl, Lee, Sang-yu, Kang, Seock-hwan, Song, Chun-ho
• Granted Patent: US 7,436,468 B2
• Time in Patent Office: Days
• US Class Current: 361/704
• CPC Class Codes: H05K 5/02 Details
• CPC Class Codes: H05K 7/20963 Heat transfer by conduction from internal heat source to heat radiating structure H05K7/20972 takes precedence
• CPC Class Codes: H05K 7/20972 Forced ventilation, e.g. on heat dissipaters coupled to components

Abstract

According to an embodiment of the present invention, an LCD comprises a liquid crystal display panel, an LED circuit board disposed behind the liquid crystal display panel, wherein a plurality of LEDs are disposed on the LED circuit board, and a thermal conductive sheet for receiving heat generated from the plurality of LEDs, wherein a thermal conductivity of the thermal conductive sheet in a surface direction is higher than a thermal conductivity in a thickness direction.

Claims

1. A liquid crystal display comprising:

a liquid crystal display panel;

a light emitting diode circuit board disposed behind the liquid crystal display panel, wherein a plurality of light emitting diodes are disposed on the light emitting diode circuit board; and

a thermal conductive sheet for receiving heat generated from the plurality of light emitting diodes, wherein a thermal conductivity of the thermal conductive sheet in a surface direction is higher than a thermal conductivity in a thickness direction.

2. The liquid crystal display according to claim 1, wherein the thermal conductivity in the surface direction is higher than the thermal conductivity in the thickness direction by 100 W/mk or more.

3. The liquid crystal display according to claim 1, wherein the thermal conductivity of the thermal conductive sheet in the surface direction is higher than about 150 W/mK.

4. The liquid crystal display according to claim 1, wherein the thermal conductivity of the thermal conductive sheet in the thickness direction is lower than about 10 W/mK.

5. The liquid crystal display according to claim 1, wherein a thickness of the thermal conductive sheet ranges between about 0.08 mm to about 1.5 mm.

6. The liquid crystal display according to claim 1, wherein the thermal conductive sheet comprises graphite.

7. The liquid crystal display according to claim 1, wherein the light emitting diode circuit board and the thermal conductive sheet are disposed in parallel with each other.

8. The liquid crystal display according to claim 1, wherein the plurality of light emitting diodes are disposed across an entire rear portion of the liquid crystal display panel.

9. The liquid crystal display according to claim 8, further comprising an upper chassis and a lower chassis housing the liquid crystal display panel and the light emitting diode circuit board, wherein the thermal conductive sheet is positioned on an external surface of the lower chassis.

10. The liquid crystal display according to claim 9, further comprising a gap pad disposed between the light emitting diode circuit board and the lower chassis, wherein the light emitting diode circuit board, the gap pad and the upper chassis are closely configured.

11. The liquid crystal display according to claim 8, further comprising an upper chassis and a lower chassis housing the liquid crystal display panel and the light emitting diode circuit board, wherein the thermal conductive sheet is disposed between the light emitting diode circuit board and the lower chassis.

12. The liquid crystal display according to claim 1, further comprising a light guiding plate disposed at a rear of the liquid crystal display panel, wherein the light emitting diode circuit board is disposed along at least one side of the light guiding plate.

13. The liquid crystal display according to claim 12, further comprising an upper chassis and a lower chassis housing the liquid crystal display panel and the light emitting diode circuit board, wherein the thermal conductive sheet is positioned in parallel with the light emitting diode circuit board on an external surface of the lower chassis.

14. A liquid crystal display comprising:

a liquid crystal display panel;

a light emitting diode circuit board disposed behind the liquid crystal display panel, wherein a plurality of light emitting diodes are disposed on the light emitting diode circuit board; and

a thermal conductive sheet for transmitting heat from the plurality of light emitting diodes substantially in a surface direction.

15. The liquid crystal display according to claim 14, wherein a thermal conductivity of the thermal conductive sheet in the surface direction is higher than the thermal conductivity in the thickness direction by 100 W/mk or more.

16. The liquid crystal display according to claim 14, wherein the thermal conductivity of the thermal conductive sheet in the surface direction is higher than about 150 W/mK.

17. The liquid crystal display according to claim 14, wherein the thermal conductivity of the thermal conductive sheet in the thickness direction is higher than about 10 W/mK.

18. The liquid crystal display according to claim 14, wherein the thermal conductive sheet comprises graphite.

19. The liquid crystal display according to claim 14, wherein a thickness of the thermal conductive sheet ranges between about 0.08 mm to about 1.5 mm.

20. The liquid crystal display according to claim 14, wherein the light emitting diode circuit board and the thermal conductive sheet are disposed in parallel with each other.

21. The liquid crystal display according to claim 14, wherein the plurality of light emitting diodes are disposed across an entire rear portion of the liquid crystal display panel.

22. The liquid crystal display according to claim 21, further comprising an upper chassis and a lower chassis housing the liquid crystal display panel and the light emitting diode circuit board, wherein the thermal conductive sheet is attached to an external surface of the lower chassis.

23. The liquid crystal display according to claim 22, further comprising a gap pad disposed between the light emitting diode circuit board and the lower chassis, wherein the light emitting diode circuit board, the gap pad and the lower chassis are closely attached.

24. The liquid crystal display according to claim 21, further comprising an upper chassis and a lower chassis housing the liquid crystal display panel and the light emitting diode circuit board, wherein the thermal conductive sheet is disposed between the light emitting diode circuit board and the lower chassis.

25. The liquid crystal display according to claim 14, further comprising a light guiding plate disposed at a rear of the liquid crystal display panel, wherein the light emitting diode circuit board is disposed along at least one side of the light guiding plate.

26. The liquid crystal display according to claim 25, further comprising an upper chassis and a lower chassis housing the liquid crystal display panel and the light emitting diode circuit board, wherein the thermal conductive sheet is attached in parallel with the light emitting diode circuit board on an external surface of the lower chassis.