Display assemblies and methods of display

• US 8,400,607 B2
• Filed: 10/06/2006
• Issued: 03/19/2013
• Est. Priority Date: 10/11/2005
• Status: Expired due to Fees

• Current Assignee: Esterline Belgium BVBA (Transdigm Group Incorporated)
• Original Assignee: Barco NV
• Inventors: Cappaert, Bart, Schroeyers, Jean-Marc
• Primary Examiner(s): Won, Bumsuk
• Assistant Examiner(s): CHANG, CHARLES S
• Application Number:
  US11/539,265
• Publication Number:
  US 20070081344A1
• Time in Patent Office: 2,356 Days
• Field of Search: 349/161, 349/61, 362/294, 362/345, 362/373
• US Class Current: 349/161
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02F 1/133385 with cooling means, e.g. fans
• CPC Class Codes: G02F 1/133622 Colour sequential illumination
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: G02F 2203/60 Temperature independent

Abstract

Applications of embodiments include the use of transmissive or transflective display technologies in extreme temperature environments. Specifically, display assemblies and methods using heating and/or active cooling are described. For example, such applications may include the use of display panels, such as LCD panels, having a diagonal dimension of 17 inches or more.

Claims

1. A display assembly comprising:

a heat sink;

a light source thermally coupled to said heat sink;

a liquid crystal display panel arranged to transmit light produced by said light source;

thermal insulation disposed to thermally insulate said liquid crystal display panel from heat generated by said light source; and

an active cooling device arranged to actively transfer heat away from a side of said thermal insulation facing said liquid crystal display panel and to a side of said thermal insulation facing said heat sink.

2. The display assembly according to claim 1, wherein said thermal insulation is a substantially planar layer disposed to be substantially parallel to said liquid crystal display panel.

3. The display assembly according to claim 2, said assembly comprising a light guide,

wherein said light source is arranged to produce said produced light into an edge of said light guide, and

wherein said light guide includes a substantially planar plate arranged to distribute said produced light across a back surface of said liquid crystal display panel, and

wherein said plate is disposed between said liquid crystal display panel and said substantially planar layer.

4. The display assembly according to claim 1, said assembly comprising at least one fan arranged to circulate a heat transfer medium on a side of said thermal insulation facing away from said heat sink.

5. The display assembly according to claim 1, said assembly comprising a substantially planar thermal conductor disposed between said liquid crystal display panel and said thermal insulation and arranged to be substantially parallel to said liquid crystal display panel, wherein said thermal conductor has a thermal conductivity at least equal to eighty watts per (meters times degrees Kelvin).

6. The display assembly according to claim 5, wherein, within a plane between said liquid crystal display panel and said thermal insulation, said thermal conductor extends below a center of the liquid crystal display panel.

7. The display assembly according to claim 1, wherein said thermal insulation is configured to thermally insulate said liquid crystal display panel from an ambient environment of the display assembly, and

wherein a space is formed between a portion of said thermal insulation that extends across a front surface of said liquid crystal display panel and said front surface of said liquid crystal display panel.

8. The display assembly according to claim 1, wherein said thermal insulation extends across at least the front and back surfaces of said liquid crystal display panel such that a space is formed between a portion of said thermal insulation that extends across the front surface of said liquid crystal display panel and said front surface of said liquid crystal display panel.

9. The display assembly according to claim 1, said assembly comprising a heater located on a side of said thermal insulation facing said liquid crystal display panel.

10. The display assembly according to claim 9, said assembly comprising a substantially planar thermal conductor disposed between said liquid crystal display panel and said thermal barrier and arranged to be substantially parallel to said liquid crystal display panel, wherein said thermal conductor has a thermal conductivity at least equal to eighty watts per (meters times degrees Kelvin),

wherein said heater is disposed on said thermal conductor.

11. The display assembly according to claim 9, wherein said heater comprises a layer in an optical stack that includes said liquid crystal display panel.

12. The display assembly according to claim 1, wherein said active cooling device includes at least one among (A) a semiconductor thermoelectric device and (B) a refrigeration unit having a compressor and a heat exchanger.

13. The display assembly according to claim 1, wherein said active cooling device includes a Peltier device.

14. The display assembly according to claim 1, said assembly comprising a light guide,

wherein said light source is arranged to produce said produced light into an edge of said light guide, and

wherein said light guide includes a substantially planar plate arranged to distribute said produced light across a back surface of said liquid crystal display panel.

15. The display assembly according to claim 14, wherein said light guide includes a hollow structure, having a reflective interior wall, that is arranged to transport said produced light to an edge of said plate.

16. The display assembly according to claim 1, wherein said light source includes at least one among a light-emitting diode and a fluorescent lamp.

17. The display assembly according to claim 1, said assembly comprising:

a metallic bezel disposed to cover a perimeter of said liquid crystal display panel; and

a gasket arranged to thermally insulate said metallic bezel from heat generated by said light source.

18. The display assembly according to claim 1, wherein said light source includes at least one light-emitting diode,

said assembly comprising a control circuit configured to modulate a light output of said light-emitting diode at a modulation frequency of 1/n times a frame rate of said liquid crystal display panel, wherein n is an integer greater than zero.

19. The display assembly according to claim 1, wherein said thermal insulation comprises a layer, made of at least one among fiber and foam, that is disposed to thermally insulate said liquid crystal display panel from heat generated by said light source.

20. The display assembly according to claim 1, wherein said light source is disposed on said side of said thermal insulation that faces said heat sink.

21. The display assembly according to claim 1, wherein said active cooling device is arranged to actively transfer heat generated by said light source away from a side of said thermal insulation facing said liquid crystal display panel and to a side of said thermal insulation facing said heat sink.

22. A display assembly comprising:

a thermal barrier;

a heat sink located on a first side of said thermal barrier;

a light source thermally coupled to said heat sink;

a liquid crystal display panel (A) located on a second side of said thermal barrier opposite the first side and (B) arranged to transmit light produced by said light source; and

an active cooling device arranged to actively transfer heat from the second side of said thermal barrier to the first side of said thermal barrier,

wherein said thermal barrier includes a substantially planar layer disposed to be substantially parallel to said liquid crystal display panel.

23. The display assembly according to claim 22, said assembly comprising a heater located on the second side of said thermal barrier.

24. The display assembly according to claim 23, said assembly comprising a substantially planar thermal conductor disposed between said liquid crystal display panel and said thermal barrier and arranged to be substantially parallel to said liquid crystal display panel, wherein said thermal conductor has a thermal conductivity at least equal to eighty watts per (meters times degrees Kelvin),

wherein said heater is disposed on said thermal conductor.

25. The display assembly according to claim 23, wherein said heater comprises a layer in an optical stack that includes said liquid crystal display panel.

26. The display assembly according to claim 22, said assembly comprising at least one fan arranged to circulate a heat transfer medium on a side of said thermal barrier facing away from said heat sink.

27. The display assembly according to claim 22, said assembly comprising a substantially planar thermal conductor disposed between said liquid crystal display panel and said thermal barrier and arranged to be substantially parallel to said liquid crystal display panel, wherein said thermal conductor has a thermal conductivity at least equal to eighty watts per (meters times degrees Kelvin).

28. The display assembly according to claim 27, wherein, within a plane between said liquid crystal display panel and said thermal barrier, said thermal conductor extends below a center of said liquid crystal display panel.

29. The display assembly according to claim 22, wherein said thermal barrier is configured to thermally insulate said liquid crystal display panel from an ambient environment of the display assembly, and

wherein a space is formed between a portion of said thermal barrier that extends across a front surface of said liquid crystal display panel and said front surface of said liquid crystal display panel.

30. The display assembly according to claim 22, wherein said thermal barrier extends across at least the front and back surfaces of said liquid crystal display panel such that a space is formed between a portion of said thermal barrier that extends across the front surface of said liquid crystal display panel and said front surface of said liquid crystal display panel.

31. The display assembly according to claim 22, wherein said active cooling device includes at least one among (A) a semiconductor thermoelectric device and (B) a refrigeration unit having a compressor and a heat exchanger.

32. The display assembly according to claim 22, wherein said active cooling device includes a Peltier device.

33. The display assembly according to claim 22, said assembly comprising a light guide,

wherein said light source is arranged to produce said produced light into an edge of said light guide, and

wherein said light guide includes a substantially planar plate arranged to distribute said produced light across a back surface of said liquid crystal display panel.

34. The display assembly according to claim 33, wherein said light guide includes a hollow structure, having a reflective interior wall, that is arranged to transport said produced light to an edge of said plate.

35. The display assembly according to claim 22, wherein said light source includes at least one among a light-emitting diode and a fluorescent lamp.

36. The display assembly according to claim 22, said assembly comprising:

a metallic bezel disposed to cover a perimeter of said liquid crystal display panel; and

a gasket arranged to thermally insulate said metallic bezel from heat generated by said light source.

37. The display assembly according to claim 22, wherein said light source includes at least one light-emitting diode,

said assembly comprising a control circuit configured to modulate a light output of said light-emitting diode at a modulation frequency of 1/n times a frame rate of said liquid crystal display panel, wherein n is an integer greater than zero.

38. The display assembly according to claim 22, wherein said substantially planar layer is made of at least one among fiber and foam.

39. The display assembly according to claim 22, wherein said heat sink is located on a first side of said substantially planar layer, and

wherein said liquid crystal display panel is located on a second side of said substantially planar layer opposite the first side, and

wherein said active cooling device is arranged to actively transfer heat from the second side of said substantially planar layer to the first side of said substantially planar layer.

40. The display assembly according to claim 39, said assembly comprising a light guide,

wherein said light source is arranged to produce said produced light into an edge of said light guide, and

wherein said light guide includes a substantially planar plate arranged to distribute said produced light across a back surface of said liquid crystal display panel, and

wherein said plate is disposed between said liquid crystal display panel and said substantially planar layer.

41. The display assembly according to claim 22, wherein said light source is disposed on said first side of said thermal barrier.

42. The display assembly according to claim 22, wherein said active cooling device is arranged to actively transfer heat generated by said light source from the second side of said thermal barrier to the first side of said thermal barrier.

43. A display assembly comprising:

a light source;

a liquid crystal display panel;

means for thermally insulating said liquid crystal display panel from heat generated by said light source;

means for transporting light produced by said light source from a first side of said means for thermally insulating to a second side of said means for thermally insulating;

on the second side of said means for thermally insulating, means for directing the transported light through said liquid crystal display panel; and

means for actively transporting heat energy from a cooler side of said means for thermally insulating to a warmer side of said means for thermally insulating.

44. The display assembly according to claim 43, wherein said light source includes at least one among a light-emitting diode and a fluorescent lamp.

45. The display assembly according to claim 43, said assembly comprising:

a metallic bezel disposed to cover a perimeter of said liquid crystal display panel; and

a gasket arranged to thermally insulate said metallic bezel from heat generated by said light source.

46. The display assembly according to claim 43, wherein said light source includes at least one light-emitting diode,

said assembly comprising a control circuit configured to modulate a light output of said light-emitting diode at a modulation frequency of 1/n times a frame rate of said liquid crystal display panel, wherein n is an integer greater than zero.

47. The display assembly according to claim 43, wherein said means for thermally insulating comprises a layer, made of at least one among fiber and foam, that is disposed to thermally insulate said liquid crystal display panel from heat generated by said light source.

48. The display assembly according to claim 43, wherein said means for actively transporting heat energy from the cooler side of said means for thermally insulating to the warmer side of said means for thermally insulating includes at least one among (A) a semiconductor thermoelectric device and (B) a refrigeration unit having a compressor and a heat exchanger.

49. The display assembly according to claim 43, wherein said assembly includes a substantially planar thermal conductor arranged to be substantially parallel to said liquid crystal display panel,

wherein said thermal conductor has a thermal conductivity at least equal to eighty watts per (meters times degrees Kelvin), and

wherein, within a plane between said liquid crystal display panel and said means for thermally insulating, said thermal conductor extends below a center of said liquid crystal display panel.

50. The display assembly according to claim 43, wherein said light source is arranged to produce said light into an edge of said means for transporting light, and

wherein said means for directing the transported light includes a substantially planar plate arranged to distribute said produced light across a back surface of said liquid crystal display panel.

51. A method of image display, said method comprising:

operating a light source to produce light, where the light source is thermally coupled to a heat sink;

transporting the produced light from a first side of a thermal barrier to a second side of the thermal barrier opposite to the first side;

on the second side of the thermal barrier, directing the transported light through a liquid crystal display panel; and

during said operating a light source, using at least one active cooling device to actively transport heat from the second side of the thermal barrier to the first side.

52. The method of image display according to claim 51, wherein said transporting the produced light includes transporting the produced light from a first side of a layer of the thermal barrier to a second side of the layer opposite to the first side of the layer, wherein the layer is made of at least one among fiber and foam.

53. The display assembly according to claim 51, wherein said using at least one active cooling device comprises using the at least one active cooling device to actively transport heat generated by said light source from the second side of the thermal barrier to the first side.

54. The method according to claim 51, wherein said method includes using a substantially planar thermal conductor to distribute heat in a plane between said liquid crystal display panel and said thermal barrier,

wherein said conductor has a thermal conductivity at least equal to eighty watts per (meters times degrees Kelvin) and is arranged to be substantially parallel to said liquid crystal display panel,

wherein, within said plane, said thermal conductor extends below a center of said liquid crystal display panel.

55. The method according to claim 51, wherein said light source is arranged to produce said light into an edge of a means for said transporting the produced light, and

wherein directing the transported light includes using a substantially planar plate to distribute said produced light across a back surface of said liquid crystal display panel.