Display Device

• US 20100277671A1
• Filed: 07/12/2010
• Published: 11/04/2010
• Est. Priority Date: 12/28/2005
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Shishido, Hideaki, Kimura, Hajime
• Granted Patent: US 8,564,741 B2
• Time in Patent Office: Days
• US Class Current: 349/64
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/56 using liquid coolants F21V29/51 takes precedence
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A cooling device is provided, where an LED backlight can be efficiently cooled in order to suppress display unevenness caused by heat generated from the LED backlight. In addition, a display device including the cooling device is also provided. A display device is provided, where the LED backlight can be cooled by arranging a coolant pipe on a back surface side of the LED backlight and supplying a coolant to a coolant pipe. Further, a display device is provided, where cooling efficiency of the LED backlight can be more improved by arranging a thermal conductor between the LED backlight and the cooling device.

Claims

1-25. -25. (canceled)

26. A display device comprising:

a liquid crystal panel; and

a back light adjacent to the liquid crystal panel, wherein the back light includes a thermal conductor, a plurality of boards formed over the thermal conductor, a plurality of light-emitting diodes formed over the plurality of boards, and a reflecting portion formed over the thermal conductor.

27. A display device according to claim 26, further comprising a pipe in which a coolant flows to cool the back light.

28. A display device according to claim 26, wherein the reflecting portion covers the plurality of boards.

29. A display device according to claim 26, wherein the liquid crystal panel includes a thin film transistor which contains InGaZnO as a semiconductor.

30. A display device according to claim 26, wherein the thermal conductor contains a metal selected from the group consisting of copper, iron, aluminum, and a stainless steel.

31. A display device according to claim 26, wherein the display device is incorporated in one selected from the group consisting of a television set, a computer, an image reproducing device, and a projector.

32. A display device comprising:

a liquid crystal panel; and

a back light adjacent to the liquid crystal panel, wherein the back light includes a thermal conductor, a plurality of boards formed over the thermal conductor, a plurality of light-emitting diodes formed over the plurality of boards, and a reflecting portion containing a plastic formed over the thermal conductor.

33. A display device according to claim 32, further comprising a pipe in which a coolant flows to cool the back light.

34. A display device according to claim 32, wherein the reflecting portion covers the plurality of boards.

35. A display device according to claim 32, wherein the liquid crystal panel includes a thin film transistor which contains InGaZnO as a semiconductor.

36. A display device according to claim 32, wherein the thermal conductor contains a metal selected from the group consisting of copper, iron, aluminum, and a stainless steel.

37. A display device according to claim 32, wherein the display device is incorporated in one selected from the group consisting of a television set, a computer, an image reproducing device, and a projector.

38. A display device comprising:

a liquid crystal panel;

a back light adjacent to the liquid crystal panel, wherein the back light includes a thermal conductor, a plurality of boards formed over the thermal conductor, a plurality of light-emitting diodes formed over the plurality of boards, and a reflecting portion formed over the thermal conductor; and

a diffusion film, a prism sheet, and a polarizing film interposed between the liquid crystal panel and the back light.

39. A display device according to claim 38, further comprising a pipe in which a coolant flows to cool the back light.

40. A display device according to claim 38, wherein the reflecting portion covers the plurality of boards.

41. A display device according to claim 38, wherein the liquid crystal panel includes a thin film transistor which contains InGaZnO as a semiconductor.

42. A display device according to claim 38, wherein the thermal conductor contains a metal selected from the group consisting of copper, iron, aluminum, and a stainless steel.

43. A display device according to claim 38, wherein the display device is incorporated in one selected from the group consisting of a television set, a computer, an image reproducing device, and a projector.

44. A display device comprising:

a liquid crystal panel; and

a back light adjacent to the liquid crystal panel, wherein the back light includes a thermal conductor, a plurality of boards formed over the thermal conductor, a plurality of light-emitting diodes formed over the plurality of boards, and a reflecting portion containing a plastic formed over the thermal conductor; and

a diffusion film, a prism sheet, and a polarizing film interposed between the liquid crystal panel and the back light.

45. A display device according to claim 44, further comprising a pipe in which a coolant flows to cool the back light.

46. A display device according to claim 44, wherein the reflecting portion covers the plurality of boards.

47. A display device according to claim 44, wherein the liquid crystal panel includes a thin film transistor which contains InGaZnO as a semiconductor.

48. A display device according to claim 44, wherein the thermal conductor contains a metal selected from the group consisting of copper, iron, aluminum, and a stainless steel.

49. A display device according to claim 44, wherein the display device is incorporated in one selected from the group consisting of a television set, a computer, an image reproducing device, and a projector.