Display architecture with waveguide routing and out-plane emission

• US 6,141,465 A
• Filed: 06/13/1997
• Issued: 10/31/2000
• Est. Priority Date: 09/09/1994
• Status: Expired due to Term

• Current Assignee: Gemfire Corp. (Medtronic Plc)
• Original Assignee: Gemfire Corp. (Medtronic Plc)
• Inventors: De Wath, Edward J., Bischel, William K., Field, Simon J., Dyer, Mark J., Brinkman, Michael J., Deacon, David A. G.
• Primary Examiner(s): Healy, Brian
• Application Number:
  US08/874,847
• Time in Patent Office: 1,236 Days
• Field of Search: 385/1-5, 385/7, 385/8, 385/10, 385/14, 385/15, 385/37, 385/17, 385/40, 385/41, 385/42, 385/49, 385/50, 385/130, 385/131, 385/132, 385/11-13, 385/16, 385/18, 385/19, 385/21, 385/22, 385/147 , 385/33, 385/116, 385/901
• US Class Current: 385/4
• CPC Class Codes: G02F 1/011 in optical waveguides, not otherwise provided for in this subclass
• CPC Class Codes: G02F 1/3558 Poled materials, e.g. with periodic poling; Fabrication of domain inverted structures, e.g. for quasi-phase-matching [QPM]
• CPC Class Codes: G02F 1/377 in an optical waveguide structure
• CPC Class Codes: G02F 2201/30 grating
• CPC Class Codes: G02F 2201/305 diffraction grating
• CPC Class Codes: G02F 2201/307 Reflective grating, i.e. Bragg grating
• CPC Class Codes: G09F 9/305 being the ends of optical fibres G09F9/302 takes precedence
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

A flat panel display is based on a new switching technology for routing laser light among a set of optical waveguides and coupling that light toward the viewer. The switching technology is based on poled electro-optical structures. The display technology is versatile enough to cover application areas spanning the range from miniature high resolution computer displays to large screen displays for high definition television formats. The invention combines the high brightness and power efficiency inherent in visible semiconductor diode laser sources with a new waveguide electro-optical switching technology to form a dense two-dimensional addressable array of high brightness light emissive pixels.

Claims

1. A display material comprising:

a first waveguide segment traversing at least a portion of said material;

a first controllable optical switch disposed along said first waveguide segment, and disposed further to redirect optical energy out of said first waveguide segment in dependence upon a first control signal; and

a first upconversion phosphor disposed to receive optical energy from said first optical switch, said phosphor re-radiating optical energy out of said material in response to optical energy excitation.

2. A display material according to claim 1, wherein said phosphor re-radiates visible light in response to infrared light received from said first optical switch.

3. A display material according to claim 1, comprising:

a plurality of controllable optical switches disposed along said first waveguide segment, each of said optical switches being disposed further to redirect optical energy out of said first waveguide segment in dependence upon a respective control signal, said plurality of controllable optical switches including said first controllable optical switch; and

an upconversion phosphor corresponding to each optical switch in said plurality of optical switches, each given one of said phosphors re-radiating optical energy out of said material in response to optical energy excitation.

4. A display material according to claim 1, comprising:

a plurality of waveguide segments each traversing a respective portion of said material, said plurality of waveguide segments including said first waveguide segment;

a plurality of controllable optical switches disposed along the waveguide segments in said plurality of waveguide segments, each of said optical switches being disposed further to redirect optical energy out of one of said waveguide segments in dependence upon a respective control signal, said plurality of controllable optical switches including said first controllable optical switch; and

an upconversion phosphor corresponding to each optical switch in said plurality of optical switches, each given one of said phosphors re-radiating optical energy out of said material in response to optical energy excitation.

45. A display material according to claim 1, further comprising a first laser coupled to provide optical energy into said first waveguide segment.

46. A display material according to claim 45, further comprising a second laser coupled to provide optical energy into said display material.

47. A display material according to claim 46, wherein the optical energy from said one of said first and second lasers comprises visible optical energy and wherein the optical energy from the other of said first and second lasers comprises infrared optical energy.

48. A display material according to claim 45, further comprising a second laser coupled to provide optical energy into said first waveguide segment.

49. A display material according to claim 45, comprising a plurality of waveguide segments each traversing a respective portion of said material, said plurality of waveguide segments including said first waveguide segment, said optical energy from said first laser being couplable into any of said waveguide segments.

50. A display material according to claim 1, further comprising a reflector disposed to reflect out of a plane of said first waveguide, optical energy re-radiated by said phosphor in response to said optical energy excitation.

5. A display material comprising:

a first waveguide segment traversing at least a portion of said material;

a plurality of secondary waveguide segments each traversing a respective portion of said material, each of said secondary waveguide segments forming a respective coupling region with said first waveguide segment, optical energy being transferrable controllably from said first waveguide segment into each of said secondary waveguide segments;

a respective pixel structure corresponding to each given one of said secondary waveguide segments, emitting optical energy in response to energy received from said given secondary waveguide segment out of a plane defined locally by said first waveguide segment and said given secondary waveguide segment.

6. A display material according to claim 5, wherein each of said secondary waveguide segments is spaced from said first waveguide segment at least in an off mode of operation.

7. A display material according to claim 6, wherein said first waveguide segment and each of said secondary waveguide segments each define a respective optical propagation axis, the optical propagation axis of said secondary waveguide segments each intersecting the optical propagation axis of said first waveguide segment.

8. A display material according to claim 5, further comprising a respective electrically-controlled optical switch disposed at each of said coupling regions.

9. A display material according to claim 8, wherein one of said optical switches comprises a parallel coupler.

10. A display material according to claim 5, wherein one of said pixel structures includes a reflector reflecting said optical energy received from the corresponding secondary waveguide segment out of the plane defined locally by said first waveguide segment and said corresponding secondary waveguide segment.

11. A display material according to claim 5, wherein one of said pixel structures includes a phosphor emitting optical energy in response to energy received from the corresponding secondary waveguide segment out of the plane defined locally by said first waveguide segment and said corresponding secondary waveguide segment.

12. A display material according to claim 11, wherein said phosphor is an upconversion phosphor.

13. A display material according to claim 5, wherein at least one of said secondary waveguide segments is a planar waveguide segment.

51. A display material according to claim 5, further comprising a first laser coupled to provide optical energy into said first waveguide segment.

52. A display material according to claim 51, further comprising a second laser coupled to provide optical energy into said display material.

53. A display material according to claim 52, wherein the optical energy from said one of said first and second lasers comprises visible optical energy and wherein the optical energy from the other of said first and second lasers comprises infrared optical energy.

54. A display material according to claim 51, further comprising a second laser coupled to provide optical energy into said first waveguide segment.

55. A display material according to claim 51, comprising a plurality of primary waveguide segments each traversing a respective portion of said material, said plurality of primary waveguide segments including said first waveguide segment, said optical energy from said first laser being couplable into any of said waveguide segments.

56. A display material according to claim 11, wherein said one of said pixel structures further includes a reflector disposed to reflect out of said plane defined locally by said first waveguide segment and said corresponding secondary waveguide segment, optical energy emitted by said phosphor.

57. A display material according to claim 11, wherein said one of said pixel structures further includes a reflector disposed to reflect into said phosphor, optical energy received from said corresponding secondary waveguide segment.

58. A display material according to claim 13, wherein said planar waveguide segment is in the same plane as said first waveguide segment.

14. A display material comprising:

a first waveguide segment traversing at least a portion of said material;

a plurality of secondary waveguide segments each traversing a respective portion of said material, each of said secondary waveguide segments forming a respective coupling region with said first waveguide segment;

a respective pixel structure corresponding to each given one of said secondary waveguide segments, emitting optical energy in response to energy received from the given secondary waveguide segment out of a plane defined locally by said first waveguide segment and the given secondary waveguide segment.

15. A display material according to claim 14, wherein each of said secondary waveguide segments is spaced from said first waveguide segment.

16. A display material according to claim 15, wherein said first waveguide segment and each of said secondary waveguide segments each define a respective optical propagation axis, the optical propagation axis of said secondary waveguide segments each intersecting the optical propagation axis of said first waveguide segment.

17. A display material according to claim 14, further comprising a respective optical diverter disposed at each of said coupling regions.

18. A display material according to claim 17, wherein said optical diverters are electrically-controllable.

19. A display material according to claim 17, wherein each given one of said secondary waveguide segments is spaced from said first waveguide segment at least in an off mode of operation of the optical diverter disposed at the coupling region of the given secondary waveguide.

20. A display material according to claim 17, wherein one of said optical diverters comprises a parallel coupler.

21. A display material according to claim 14, wherein one of said pixel structures includes a reflector reflecting said optical energy received from the corresponding secondary waveguide segment out of the plane defined locally by said first waveguide segment and said corresponding secondary waveguide segment.

22. A display material according to claim 14, wherein one of said pixel structures includes a phosphor emitting optical energy in response to energy received from the corresponding secondary waveguide segment out of the plane defined locally by said first waveguide segment and said corresponding secondary waveguide segment.

23. A display material according to claim 22, wherein said phosphor is an upconversion phosphor.

24. A display material according to claim 14, wherein one of said secondary waveguide segments is a planar waveguide.

59. A display material according to claim 14, further comprising a first laser coupled to provide optical energy into said first waveguide segment.

60. A display material according to claim 59, further comprising a second laser coupled to provide optical energy into said display material.

61. A display material according to claim 60, wherein the optical energy from said one of said first and second lasers comprises visible optical energy and wherein the optical energy from the other of said first and second lasers comprises infrared optical energy.

62. A display material according to claim 59, further comprising a second laser coupled to provide optical energy into said first waveguide segment.

63. A display material according to claim 59, comprising a plurality of primary waveguide segments each traversing a respective portion of said material, said plurality of primary waveguide segments including said first waveguide segment, said optical energy from said first laser being couplable into any of said waveguide segments.

64. A display material according to claim 22, wherein said one of said pixel structures further includes a reflector disposed to reflect out of said plane defined locally by said first waveguide segment and said corresponding secondary waveguide segment, optical energy emitted by said phosphor.

65. A display material according to claim 22, wherein said one of said pixel structures further includes a reflector disposed to reflect into said phosphor, optical energy received from said corresponding secondary waveguide segment.

25. A display material comprising:

a first waveguide segment traversing at least a portion of said material;

a first optical diverter disposed along said first waveguide segment, and disposed further to redirect by reflection, optical energy out of said first waveguide segment; and

a first target disposed to receive optical energy from said first optical diverter, said target emitting optical energy out of said material in response to optical energy received from said first optical diverter.

26. A display material according to claim 25, wherein said first optical diverter is controllable in dependence upon a first control signal.

27. A display material according to claim 25, wherein said target comprises a reflector.

28. A display material according to claim 25, wherein said target comprises a phosphor.

29. A display material according to claim 25, comprising:

a plurality of controllable optical diverters disposed along said first waveguide segment, each of said optical diverters being disposed further to reflectively redirect optical energy out of said first waveguide segment in dependence upon a respective control signal, said plurality of controllable optical diverters including said first optical diverter; and

a phosphor target corresponding to each optical diverter in said plurality of optical diverters, each given one of said targets re-radiating optical energy out of said material in response to optical energy excitation.

30. A display material according to claim 25, comprising:

a plurality of waveguide segments each traversing a respective portion of said material, said plurality of waveguide segments including said first waveguide segment;

a plurality of controllable optical diverters disposed along the waveguide segments in said plurality of waveguide segments, each of said optical diverters being disposed further to reflectively redirect optical energy out of one of said waveguide segments in dependence upon a respective control signal, said plurality of controllable optical diverters including said first optical diverter; and

a phosphor target corresponding to each optical diverter in said plurality of optical diverters, each given one of said targets re-radiating optical energy out of said material in response to optical energy excitation.

32. A display material according to claim 30, wherein each of said pixel structures is spaced from said first waveguide segment.

33. A display material according to claim 30, further comprising a respective optical diverter disposed at each of said coupling regions.

34. A display material according to claim 33, wherein said optical diverters are controllable.

66. A display material according to claim 25, further comprising a first laser coupled to provide optical energy into said first waveguide segment.

67. A display material according to claim 66, further comprising a second laser coupled to provide optical energy into said display material.

68. A display material according to claim 67, wherein the optical energy from said one of said first and second lasers comprises visible optical energy and wherein the optical energy from the other of said first and second lasers comprises infrared optical energy.

69. A display material according to claim 66, further comprising a second laser coupled to provide optical energy into said first waveguide segment.

70. A display material according to claim 66, comprising a plurality of waveguide segments each traversing a respective portion of said material, said plurality of waveguide segments including said first waveguide segment, said optical energy from said first laser being couplable into any of said waveguide segments.

71. A display material according to claim 28, wherein said phosphor comprises an upconversion phosphor.

72. A display material according to claim 71, wherein said first target further includes a reflector disposed to reflect out of said material, optical energy emitted by said phosphor.

73. A display material according to claim 71, wherein said first target further includes a reflector disposed to reflect into said phosphor, optical energy received from said first optical diverter.

74. A display material according to claim 25, comprising:

a plurality of controllable optical diverters disposed along said first waveguide segment, each of said optical diverters being disposed further to reflectively redirect optical energy out of said first waveguide segment in dependence upon a respective control signal, said plurality of controllable optical diverters including said first optical diverter; and

a target corresponding to each optical diverter in said plurality of optical diverters, each given one of said targets emitting optical energy out of said material in response to optical energy received from the optical diverter corresponding to the given target.

75. A display material according to claim 25, comprising:

a plurality of waveguide segments each traversing a respective portion of said material, said plurality of waveguide segments including said first waveguide segment;

a plurality of controllable optical diverters disposed along the waveguide segments in said plurality of waveguide segments, each of said optical diverters being disposed further to reflectively redirect optical energy out of one of said waveguide segments in dependence upon a respective control signal, said plurality of controllable optical diverters including said first optical diverter; and

a target corresponding to each optical diverter in said plurality of optical diverters, each given one of said targets emitting optical energy out of said material in response to optical energy received from the optical diverter corresponding to the given target.

31. A display material comprising:

a first waveguide segment traversing at least a portion of said material;

a planar waveguide alongside said first waveguide segment;

a plurality of coupling regions along said first waveguide segment, optical energy being transferrable from said first waveguide segment into said planar waveguide at each of said coupling regions; and

a respective pixel structure corresponding to each given one of said coupling regions, emitting optical energy out said planar waveguide in response to energy received from said given coupling region.

35. A display material according to claim 31, wherein one of said pixel structures includes a reflector reflecting out of said planar waveguide said optical energy received from the corresponding coupling region.

36. A display material according to claim 31, wherein one of said pixel structures includes a phosphor emitting optical energy out of said planar waveguide in response to energy received from the corresponding coupling region.

37. A display material according to claim 36, wherein said phosphor is an upconversion phosphor.

38. A display material according to claim 31, wherein said first waveguide segment comprises a channel waveguide segment.

76. A display material according to claim 31, further comprising a first laser coupled to provide optical energy into said first waveguide segment.

77. A display material according to claim 76, further comprising a second laser coupled to provide optical energy into said display material.

78. A display material according to claim 77, wherein the optical energy from said one of said first and second lasers comprises visible optical energy and wherein the optical energy from the other of said first and second lasers comprises infrared optical energy.

79. A display material according to claim 76, further comprising a second laser coupled to provide optical energy into said first waveguide segment.

80. A display material according to claim 76, comprising a plurality of waveguide segments each traversing a respective portion of said material, said plurality of waveguide segments including said first waveguide segment, said optical energy from said first laser being couplable into any of said waveguide segments.

81. A display material according to claim 31, wherein said planar waveguide is in the same plane as said first waveguide segment.

82. A display material according to claim 36, wherein said one of said pixel structures further includes a reflector disposed to reflect out of said planar waveguide, optical energy emitted by said phosphor.

83. A display material according to claim 36, wherein said one of said pixel structures further includes a reflector disposed to reflect into said phosphor, optical energy received from said corresponding coupling region.

39. A display material comprising:

an integrated optical waveguide system; and

a plurality of discrete phosphor targets disposed to receive optical energy from said waveguide system, said phosphor targets re-radiating optical energy in response to optical energy received from said waveguide system.

40. A display material according to claim 39, wherein each of said phosphor targets is disposed in a common plane with a waveguide in said waveguide system.

41. A display material according to claim 39, wherein said waveguide system is disposed in a first plane and said phosphor targets are disposed in a plane parallel to but distinct from said first plane,

further comprising a plurality of selectable optical redirectors disposed to, when selected, redirect optical energy from said waveguide system toward a respective one of said phosphor targets.

42. A display material according to claim 39, wherein one of said phosphor targets comprises an upconversion phosphor.

43. A display material according to claim 39, wherein one of said selectable optical redirectors comprises a thermo-optic switch.

44. A display material according to claim 39, wherein each of said phosphor targets is a phosphor dot.

84. A display material according to claim 39, further comprising a first laser coupled to provide optical energy into said integrated optical waveguide system.

85. A display material according to claim 84, further comprising a second laser coupled to provide optical energy into said integrated optical waveguide system.

86. A display material according to claim 85, wherein the optical energy from said first laser comprises visible optical energy and wherein the optical energy from said second laser comprises infrared optical energy.

87. A display material according to claim 84, further comprising a second laser coupled to provide optical energy into said integrated optical waveguide system.

88. A display material according to claim 84, wherein said integrated optical waveguide system comprises a plurality of waveguide segments, said optical energy from said first laser being couplable into any of said waveguide segments.

89. A display material according to claim 39, further comprising a reflector disposed to reflect out of said material, optical energy re-radiated from one of said phosphor targets.