Illumination apparatus

• US 8,128,272 B2
• Filed: 06/07/2006
• Issued: 03/06/2012
• Est. Priority Date: 06/07/2005
• Status: Active Grant

• Current Assignee: Oree Advanced Illumination Solutions Ltd.
• Original Assignee: Oree, Inc.
• Inventors: Fine, Eran, Meir, Noam
• Primary Examiner(s): Ton, Anabel
• Application Number:
  US11/921,305
• Publication Number:
  US 20090129115A1
• Time in Patent Office: 2,099 Days
• Field of Search: 362/230, 362/231, 362606-608, 362/800
• US Class Current: 362/606
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0041 provided in the bulk of the light guide
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity

Abstract

An illumination apparatus, comprising at least one light emitting source embedded in a waveguide material is disclosed. The waveguide material is capable of propagating light generated by light emitting source(s), such that at least a portion of the light is diffused within the waveguide material and exits through at least a portion of its surface.

Claims

1. An illumination apparatus comprising:

a substantially planar flexible waveguide; and

at least one light source embedded within the waveguide,

wherein the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, and (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof.

2. The illumination apparatus of claim 1, wherein the exit region comprises a lateral end of the waveguide.

3. The illumination apparatus of claim 1, wherein the exit region comprises a portion of a top surface of the waveguide displaced from the at least one light source.

4. The illumination apparatus of claim 1, wherein each said at least one light source is a bare die LED.

5. The illumination apparatus of claim 1, wherein each said at least one light source is a packaged LED.

6. The illumination apparatus of claim 1, wherein each said at least one light source is an organic LED.

8. The illumination apparatus of claim 1, further comprising an electrical line, at least a portion of which is embedded within the waveguide, connecting the at least one light source to an external power source.

9. The illumination apparatus of claim 1, wherein the at least one light source comprises an electrical contact extending outside the waveguide.

10. The illumination apparatus of claim 9, wherein the electrical contact is connected to a printed circuit board.

11. The illumination apparatus of claim 10, wherein the printed circuit board is in thermal contact with the at least one light source, such that heat generated by the at least one light source during operation is conducted through the printed circuit board.

12. The illumination apparatus of claim 1, wherein (i) the at least one light source comprises at least two light sources, each emitting light of a different wavelength, (ii) the light from the at least two light sources mixes within the waveguide, and (iii) light exiting the exit region is substantially white.

13. The illumination apparatus of claim 1, further comprising, disposed in the waveguide, at least one photoluminescent material for converting a wavelength of a portion of the light emitted by the at least one light source.

14. The illumination apparatus of claim 13, wherein unconverted light from the at least one light source mixes with light converted by the at least one photoluminescent material to produce substantially white light.

85. The illumination apparatus of claim 1 comprising a plurality of impurities disposed within the waveguide proximate the exit region.

86. The illumination apparatus of claim 85, wherein a concentration of the impurities varies along at least one dimension of the waveguide.

7. An illumination apparatus comprising:

a substantially planar waveguide; and

at least one light source embedded within the waveguide,

wherein a refraction index of the waveguide and a refraction index of the at least one light source differ by about 1.5 to about 1.6, and the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, and (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof.

15. An illumination apparatus comprising:

a substantially planar waveguide;

at least one light source embedded within the waveguide,

wherein the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, and (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof; and

disposed over the exit region of the waveguide, at least one photoluminescent material for converting a wavelength of a portion of the light emitted by the at least one light source.

16. The illumination apparatus of claim 15, wherein unconverted light from the at least one light source mixes with light converted by the at least one photoluminescent material to produce substantially white light.

42. The illumination apparatus of claim 15, wherein the exit region comprises a lateral end of the waveguide.

43. The illumination apparatus of claim 15, wherein the exit region comprises a portion of a top surface of the waveguide displaced from the at least one light source.

44. The illumination apparatus of claim 15, wherein each said at least one light source is a bare die LED.

45. The illumination apparatus of claim 15, wherein each said at least one light source is a packaged LED.

46. The illumination apparatus of claim 15, wherein each said at least one light source is an organic LED.

47. The illumination apparatus of claim 15, further comprising a plurality of impurities disposed within the waveguide proximate the exit region.

48. The illumination apparatus of claim 47, wherein a concentration of the impurities varies along at least one dimension of the waveguide.

49. The illumination apparatus of claim 15, wherein the waveguide is flexible.

50. The illumination apparatus of claim 15, wherein the waveguide comprises a plurality of layers, and the at least one light source is embedded at least partially within a first layer having a refractive index larger than a refractive index of a second layer disposed above the first layer.

51. The illumination apparatus of claim 50, further comprising an optical element, disposed within the second layer, for redirecting at least a portion of the light emitted by the at least one light source out of the first layer.

52. The illumination apparatus of claim 51, wherein the optical element redirects light based on a wavelength of the light.

53. The illumination apparatus of claim 51, wherein the optical element redirects light based on an angle of incidence of the light.

54. The illumination apparatus of claim 51, wherein the optical element redirects light based on a polarization of the light.

55. The illumination apparatus of claim 15, wherein the waveguide comprises a material having a specific heat capacity sufficiently high enough to substantially prevent heating of the waveguide during operation of the at least one light source.

56. The illumination apparatus of claim 15, further comprising a thermal-isolating encapsulation material disposed around the at least one light source.

57. The illumination apparatus of claim 15, further comprising a structured film embedded within the waveguide.

87. The illumination apparatus of claim 15, further comprising an electrical line, at least a portion of which is embedded within the waveguide, connecting the at least one light source to an external power source.

88. The illumination apparatus of claim 15, wherein the at least one light source comprises an electrical contact extending outside the waveguide.

89. The illumination apparatus of claim 88, wherein the electrical contact is connected to a printed circuit board.

90. The illumination apparatus of claim 89, wherein the printed circuit board is in thermal contact with the at least one light source, such that heat generated by the at least one light source during operation is conducted through the printed circuit board.

91. The illumination apparatus of claim 15, wherein (i) the at least one light source comprises at least two light sources, each emitting light of a different wavelength, (ii) the light from the at least two light sources mixes within the waveguide, and (iii) light exiting the exit region is substantially white.

92. The illumination apparatus of claim 15, further comprising, disposed in the waveguide, at least one photoluminescent material for converting a wavelength of a portion of the light emitted by the at least one light source.

17. An illumination apparatus comprising:

a substantially planar waveguide;

at least one light source embedded within the waveguide,

wherein the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, and (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof; and

a plurality of impurities disposed within the waveguide proximate the exit region.

18. The illumination apparatus of claim 17, wherein a concentration of the impurities varies along at least one dimension of the waveguide.

19. The illumination apparatus of claim 17, wherein at least a portion of the plurality of impurities are fluorescent.

20. An illumination apparatus comprising:

a substantially planar waveguide; and

at least one light source embedded within the waveguide,

wherein the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof, and (iv) comprises a plurality of layers, and the at least one light source is embedded at least partially within a first layer having a refractive index larger than a refractive index of a second layer disposed above the first layer.

21. The illumination apparatus of claim 20, further comprising an optical element, disposed within the second layer, for redirecting at least a portion of the light emitted by the at least one light source out of the first layer.

22. The illumination apparatus of claim 21, wherein the optical element redirects light based on a wavelength of the light.

23. The illumination apparatus of claim 21, wherein the optical element redirects light based on an angle of incidence of the light.

24. The illumination apparatus of claim 21, wherein the optical element redirects light based on a polarization of the light.

25. An illumination apparatus comprising:

a substantially planar waveguide; and

at least one light source embedded within the waveguide,

wherein the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof, and (iv) comprises a material having a specific heat capacity sufficiently high enough to substantially prevent heating of the waveguide during operation of the at least one light source.

26. An illumination apparatus comprising:

a substantially planar waveguide;

at least one light source embedded within the waveguide; and

a thermal-isolating encapsulation material disposed around the at least one light source,

wherein the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, and (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof.

27. An illumination apparatus comprising:

a substantially planar waveguide;

at least one light source embedded within the waveguide; and

a structured film embedded within the waveguide,

wherein the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, and (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof.

28. An illumination apparatus comprising:

a substantially planar waveguide; and

at least one light source embedded within the waveguide,

wherein the waveguide (i) has a planar top surface above the at least one embedded light source, (ii) retains therein substantially all light emitted by the at least one embedded light source, and (iii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof, and light exiting the exit region has a uniformity of at least 70%.

58. The illumination apparatus of claim 28, wherein the exit region comprises a lateral end of the waveguide.

59. The illumination apparatus of claim 28, wherein the exit region comprises a portion of a top surface of the waveguide displaced from the at least one light source.

60. The illumination apparatus of claim 28, wherein each said at least one light source is a bare die LED.

61. The illumination apparatus of claim 28, wherein each said at least one light source is a packaged LED.

62. The illumination apparatus of claim 28, wherein each said at least one light source is an organic LED.

63. The illumination apparatus of claim 28, wherein a refraction index of the waveguide and a refraction index of the at least one light source differ by about 1.5 to about 1.6.

64. The illumination apparatus of claim 28, further comprising an electrical line, at least a portion of which is embedded within the waveguide, connecting the at least one light source to an external power source.

65. The illumination apparatus of claim 28, wherein the at least one light source comprises an electrical contact extending outside the waveguide.

66. The illumination apparatus of claim 65, wherein the electrical contact is connected to a printed circuit board.

67. The illumination apparatus of claim 66, wherein the printed circuit board is in thermal contact with the at least one light source, such that heat generated by the at least one light source during operation is conducted through the printed circuit board.

68. The illumination apparatus of claim 28, wherein (i) the at least one light source comprises at least two light sources, each emitting light of a different wavelength, (ii) the light from the at least two light sources mixes within the waveguide, and (iii) light exiting the exit region is substantially white.

69. The illumination apparatus of claim 28, further comprising, disposed in the waveguide, at least one photoluminescent material for converting a wavelength of a portion of the light emitted by the at least one light source.

70. The illumination apparatus of claim 69, wherein unconverted light from the at least one light source mixes with light converted by the at least one photoluminescent material to produce substantially white light.

71. The illumination apparatus of claim 28, further comprising, disposed over the exit region of the waveguide, at least one photoluminescent material for converting a wavelength of a portion of the light emitted by the at least one light source.

72. The illumination apparatus of claim 71, wherein unconverted light from the at least one light source mixes with light converted by the at least one photoluminescent material to produce substantially white light.

73. The illumination apparatus of claim 28, further comprising a plurality of impurities disposed within the waveguide proximate the exit region.

74. The illumination apparatus of claim 73, wherein a concentration of the impurities varies along at least one dimension of the waveguide.

75. The illumination apparatus of claim 73, wherein at least a portion of the plurality of impurities are fluorescent.

76. The illumination apparatus of claim 28, wherein the waveguide is flexible.

77. The illumination apparatus of claim 28, wherein the waveguide comprises a plurality of layers, and the at least one light source is embedded at least partially within a first layer having a refractive index larger than a refractive index of a second layer disposed above the first layer.

78. The illumination apparatus of claim 77, further comprising an optical element, disposed within the second layer, for redirecting at least a portion of the light emitted by the at least one light source out of the first layer.

79. The illumination apparatus of claim 78, wherein the optical element redirects light based on a wavelength of the light.

80. The illumination apparatus of claim 78, wherein the optical element redirects light based on an angle of incidence of the light.

81. The illumination apparatus of claim 78, wherein the optical element redirects light based on a polarization of the light.

82. The illumination apparatus of claim 28, wherein the waveguide comprises a material having a specific heat capacity sufficiently high enough to substantially prevent heating of the waveguide during operation of the at least one light source.

83. The illumination apparatus of claim 28, further comprising a thermal-isolating encapsulation material disposed around the at least one light source.

84. The illumination apparatus of claim 28, further comprising a structured film embedded within the waveguide.

29. A method of illumination, the method comprising:

providing a substantially planar waveguide having at least one light source embedded therewithin; and

applying a pulsed electrical current to the at least one light source, thereby causing the at least one light source to emit light,

wherein the emitted light propagates within the waveguide until the light is caused to exit from an exit region of a surface thereof, and the waveguide (i) has a planar top surface above the at least one embedded light source, and (ii) retains therein substantially all light emitted by the at least one embedded light source.

30. The method of claim 29, wherein each said at least one light source is a bare die LED.

31. The method of claim 29, wherein each said at least one light source is a packaged LED.

32. The method of claim 29, wherein each said at least one light source is an organic LED.

33. The method of claim 29, wherein a temperature of the waveguide remains substantially constant during application of the pulsed electrical current to the at least one light source.

34. The method of claim 29, wherein the at least one light source comprises an electrical contact extending outside the waveguide and connected to a printed circuit board, and at least a portion of the heat generated by the at least one light source is conducted away from the waveguide by the printed circuit board.

93. The method of claim 29, wherein the waveguide comprises a material having a specific heat capacity sufficiently high enough to substantially prevent heating of the waveguide during operation of the at least one light source.

35. A method of illumination, the method comprising:

providing a substantially planar waveguide having at least one light source embedded therewithin; and

applying a pulsed electrical current to the at least one light source, thereby causing the at least one light source to emit light,

wherein (i) the emitted light propagates within the waveguide until the light is caused to exit from an exit region of a surface thereof, and (ii) a thermal-isolating encapsulation material is disposed around the at least one light source.

36. The method of claim 35, wherein each said at least one light source is a bare die LED.

37. The method of claim 35, wherein each said at least one light source is a packaged LED.

38. The method of claim 35, wherein each said at least one light source is an organic LED.

39. The method of claim 35, wherein a temperature of the waveguide remains substantially constant during application of the pulsed electrical current to the at least one light source.

40. The method of claim 35, wherein the waveguide (i) has a planar top surface above the at least one embedded light source, and (ii) retains therein substantially all light emitted by the at least one embedded light source.

41. The method of claim 35, wherein the at least one light source comprises an electrical contact extending outside the waveguide and connected to a printed circuit board, and at least a portion of the heat generated by the at least one light source is conducted away from the waveguide by the printed circuit board.

94. The method of claim 35, wherein the waveguide comprises a material having a specific heat capacity sufficiently high enough to substantially prevent heating of the waveguide during operation of the at least one light source.