Light emitting devices for liquid crystal displays

• US 20070045640A1
• Filed: 08/23/2005
• Published: 03/01/2007
• Est. Priority Date: 08/23/2005
• Status: Abandoned Application

• Current Assignee: Rambus International Ltd (Rambus Inc.)
• Original Assignee: Rambus International Ltd (Rambus Inc.)
• Inventors: Brown, Michael, Lim, Michael, Erchak, Alexei, Karlicek, Robert, Venezia, Jo
• Application Number:
  US11/210,262
• Publication Number:
  US 20070045640A1
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02B 6/0018 Redirecting means on the surface of the light guide
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/1225 comprising photonic band-gap structures or photonic lattices
• CPC Class Codes: H01L 2224/49111 the connectors connecting two common bonding areas, e.g. Litz or braid wires
• CPC Class Codes: H01L 33/22 Roughened surfaces, e.g. at the interface between epitaxial layers
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H04N 9/3152 for shaping the light beam beam shaping per se G02B27/09

Abstract

Light-emitting devices, and related components, processes, systems and methods are disclosed.

Claims

1. A system, comprising:

a panel having an edge, the edge having a thickness; and

a light emitting device disposed such that light emitted from the light emitting device impinges on the edge of the panel, the light emitting device having a surface;

wherein a ratio of a width of the surface of the light emitting device to the thickness of the edge of the panel is from about 0.5 to about 1.1

2. The system of claim 1, wherein the panel comprises a liquid crystal display (LCD).

3. The system of claim 1, wherein a length of the surface of the light emitting device is at least about 1 mm.

4. The system of claim 1, wherein a length of the surface of the light emitting device is at least about 2 mm.

5. The system of claim 1, wherein a length of the surface of the light emitting device is at least about 3 mm.

6. The system of claim 1, wherein a length of the surface of the light emitting device is at least about 5 mm.

7. The system of claim 1, wherein a length of the surface of the light emitting device is at least about 10 mm.

8. The system of claim 1, wherein the ratio of the width of the surface of the light emitting device to the thickness of the edge of the panel is from about 0.75 to about 1.05.

9. The system of claim 1, wherein the ratio of the width of the surface of the light emitting device to the thickness of the edge of the panel is about 0.9 to about 1.

10. The system of claim 1, further comprising at least one optical component disposed between the light emitting device and the panel.

11. The system of claim 10, wherein the at least one optical component comprises a light homogenizer.

12. The system of claim 1, wherein the light emitting device is a non-lambertian light emitting device.

13. The system of claim 1, wherein the light emitting device is a photonic lattice light emitting device.

14. The system of claim 1, wherein light emitting device comprises a multi-layer stack of materials including a light generating region, and a first layer supported by the light generating region, a surface of the first layer being configured so that the light generated by the light generating region can emerge from the light emitting device via the surface of the first layer.

15. The system of claim 14, wherein the surface of the first layer has a dielectric function that varies spatially according to a pattern, and the pattern has an ideal lattice constant and a detuning parameter with a value greater than zero.

16. The system of claim 14, wherein the surface of the first layer has a dielectric function that varies spatially according to a nonperiodic pattern.

17. The system of claim 14, wherein the surface of the first layer has a dielectric function that varies spatially according to a complex periodic pattern.

18. The system of claim 14, wherein the surface of the first layer has a dielectric function that varies spatially according to a periodic pattern.

19. The system of claim 1, wherein the light emitting device comprises a light emitting diode.

20. The system of claim 1, wherein a light emitting device comprises a single light emitting device.

21. The system of claim 1, wherein a light emitting device comprises a plurality of light emitting devices.

22. The system of claim 21, wherein the plurality of light emitting devices is disposed in a serrated arrangement along the edge of the panel.

23. The system of claim 1, wherein the plurality of light emitting devices are disposed in a plurality of columns.

24. The system of claim 23, wherein the plurality of columns comprises at least a first column and a second column.

25. The system of claim 24, wherein:

the first column comprises a plurality of light emitting devices configured to emit a first color of light; and

the second column comprises a plurality of light emitting devices configured to emit a second color of light, the first and second colors of light being different.

26. The system of claim 25, wherein a third column comprises a plurality of light emitting devices configured to emit a third color of light, the first, second and third colors of light being different.

27. The system of claim 26, wherein the first, second, and third colors are selected from the group consisting of red, green, and blue.

28. The system of claim 1, wherein the edge comprises a first edge and the a panel further comprises a second edge, edge having a thickness;

and

the system further comprises a light emitting device disposed such that light emitted from the light emitting device impinges on the second edge of the panel.

29. The system of claim 1, further comprising a cooling system configured so that, during use, the cooling system regulates a temperature of the light emitting diode.

30. The system of claim 1, wherein the light emitting device is mounted on a heat sink device.

42. The system of claim 8, wherein the surface of the first layer has a dielectric function that varies spatially according to a periodic pattern.

31. A system, comprising:

a panel having an edge; and

an array of light emitting devices disposed such that light emitted from the array of light emitting device impinges on the panel, the array of light emitting devices comprising;

a first column of light emitting devices, the first column having a first edge and a second edge about perpendicular to the first edge; and

a second column of light emitting devices, the second column of light emitting devices having a first edge, a second edge, and a third edge, the first and second edges of the second column being about parallel to the first edge of the first column, the second edge of the second column being about parallel to the second edge of the first column, and the second edge of the second column being offset by at least about 0.05 mm from the second edge of the first column in a direction about perpendicular to the second edge of the first column.

32. The system of claim 31, further comprising a third column of light emitting devices, the third column of light emitting devices having a first edge and a second edge, the first edge of the third column being about parallel to the third edge of the second column, the second edge of the third column being about parallel to the second edge of the second column, and the second edge of the third column being offset by at least about 0.05 mm from the second edge of the second column in a direction about perpendicular to the second edge of the first column.

33. The system of claim 31, wherein the panel comprises a liquid crystal display (LCD).

34. The system of claim 31, wherein:

the first column comprises a plurality of light emitting devices configured to emit a first color of light;

the second column comprises a plurality of light emitting devices configured to emit a second color of light; and

the first and second colors of light are different.

35. The system of claim 32, wherein the third column comprises a plurality of light emitting devices configured to emit a third color of light, and the first, second and third colors of light are different.

36. The system of claim 35, wherein the first, second, and third colors are selected from the group consisting of red, green, and blue.

37. The system of claim 32, wherein

the first column has a first width;

the second column has a second width;

the third column has a third width; and

a ratio a sum of the first, second, and third widths to a thickness of the edge of the panel is from about 0.5 to about 1.1.

38. The system of claim 31, wherein at least one of the light emitting devices in the array of light emitting devices comprises a first layer supported by a light generating region, a surface of the first layer being configured so that light generated by the light generating region can emerge from the light emitting device via a surface of the first layer.

39. The system of claim 38, wherein the surface of the first layer has a dielectric function that varies spatially according to a pattern, and the pattern has an ideal lattice constant and a detuning parameter with a value greater than zero.

40. The system of claim 38, wherein the surface of the first layer has a dielectric function that varies spatially according to a nonperiodic pattern.

41. The system of claim 38, wherein the surface of the first layer has a dielectric function that varies spatially according to a complex periodic pattern.

43. The system of claim 31, wherein the second column is offset from the first column and the third column by at least about 0.1 mm.

44. The system of claim 31, wherein the second column is offset from the first column and the third column by at least about 0.2 mm.

45. The system of claim 31, wherein the second column is offset from the first column and the third column by at least about 0.3 mm.

46. The system of claim 31, wherein the second column is offset from the first column and the third column by at least about 0.5 mm.

47. The system of claim 31, wherein the second column is offset from the first column and the third column by at least about 1 mm.

48. The system of claim 31, further comprising at least one optical component disposed between the light emitting device and the panel.

49. The system of claim 48, wherein the at least one optical component is a light homogenizer.

50. The system of claim 31, wherein the light emitting device is a non-lambertian light emitting device.

51. The system of claim 31, wherein the light emitting device is a photonic lattice light emitting device.

52. The system of claim 31, wherein the light emitting device comprises a light emitting diode.

53. The system of claim 31, wherein the array of light emitting diodes includes at least one light emitting diode selected from the group consisting of red light emitting diodes, blue light emitting diodes, and green light emitting diodes.

54. The system of claim 31, wherein the array of light emitting diodes include a red light emitting diode, a blue light emitting diode, and a green light emitting diode.

55. The system of claim 31, wherein the array of light emitting devices is disposed in a serrated arrangement along the edge of the panel.

56. The system of claim 31, further comprising a cooling system configured so that, during use, the cooling system regulates a temperature of the array of light emitting diodes.