Anisotropic collimation devices and related methods

• US 7,348,603 B2
• Filed: 03/07/2006
• Issued: 03/25/2008
• Est. Priority Date: 10/17/2005
• Status: Expired due to Fees

• Current Assignee: Luminus Devices Incorporated (Sanan Optoelectronics Company Limited)
• Original Assignee: Luminus Devices Incorporated (Sanan Optoelectronics Company Limited)
• Inventors: Nemchuck, Nikolay I., Lim, Michael, Erchak, Alexei A., Lidorikis, Elefterios, Venezia, Jo A.
• Primary Examiner(s): Whitehead, Jr.; Carl
• Assistant Examiner(s): Dolan; Jennifer M.
• Application Number:
  US11/369,895
• Publication Number:
  US 20070085083A1
• Time in Patent Office: 749 Days
• Field of Search: 257/E33.067, 257/E33.071, 257/E33.074, 438/27, 438/32, 977/949, 977/950, 977/951, 977/952
• US Class Current: 257/98
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02B 6/1225 comprising photonic band-gap structures or photonic lattices
• CPC Class Codes: H01L 2933/0083 Periodic patterns for optical field-shaping in or on the semiconductor body or semiconductor body package, e.g. photonic bandgap structures
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate

Abstract

Devices, such as light-emitting devices (e.g., LEDs), and methods associated with such devices are provided. A light-emitting device designed to emit light may include an interface through which emitted light passes therethrough, wherein the interface has a dielectric function that varies spatially according to a pattern. The pattern may be arranged to provide anisotropic light emission characterized by an emission pattern on a far-field projection plane substantially parallel to the interface, wherein a first total light intensity along a first axis on the projection plane is at least 20% greater than a second total light intensity along a second axis on the projection plane. Alternatively, or additionally, the pattern may be arranged to provide anisotropic light emission characterized by a first total light emission on a first plane that is at least 20% greater than a second total light emission on a second plane, wherein the first and second planes are perpendicular to the interface, and wherein the first and second planes are also perpendicular to each other.

Claims

1. A light-emitting device designed to emit light, the device comprising:

an interface through which emitted light passes therethrough, the interface having a dielectric function that varies spatially according to a pattern,

wherein emitted light is extracted through the pattern and the pattern is arranged to provide anisotropic light emission characterized by an emission pattern on a far-field projection plane substantially parallel to the interface, wherein a first total light intensity along a first axis on the projection plane is at least 20% greater than a second total light intensity along a second axis on the projection plane.

2. The device of claim 1, wherein the second axis is perpendicular to the first axis.

3. The device of claim 1, wherein the pattern comprises a plurality of holes formed in the interface.

4. The device of claim 1, wherein the first total light intensity along the first axis is at least 50% greater than the second total light intensity along the second axis.

5. The device of claim 1, wherein the first total light intensity along the first axis is at least 75% greater than the second total light intensity along the second axis.

6. The device of claim 1, wherein the first total light along the first axis is at least 100% greater than the second total light intensity along the second axis.

7. The device of claim 1, wherein the pattern conforms to a transformation of a precursor pattern according to a mathematical function.

8. The device of claim 7, wherein the precursor pattern comprises a periodic pattern.

9. The device of claim 8, wherein the mathematical function comprises providing an angular displacement that at least depends on a radial distance from a reference origin.

10. The device of claim 1, wherein the pattern conforms to at least a portion of a transformation of a precursor pattern, and wherein the transformation of the precursor pattern is defined according to a mathematical function.

11. The device of claim 1, wherein the pattern comprises a plurality of regions, each of the plurality of regions having a dielectric function that varies spatially according to a partial pattern, wherein the partial pattern conforms to at least a portion of a transformation of a precursor pattern, and wherein the transformation of the precursor pattern is defined according to a mathematical function.

12. A light-emitting assembly including the device of claim 1, the light-emitting assembly comprising:

an illumination panel associated with the light-emitting device of claim 1 such that light emitted from the light-emitting device passes therethrough, wherein the light-emitting device is arranged to emit light into an edge of the illumination panel.

13. The light-emitting assembly of claim 12, wherein higher intensity emission portions of the anisotropic light emission are substantially aligned with the edge of the illumination panel.

14. The light-emitting assembly of claim 13, further comprising an LCD layer disposed over the illumination panel.

15. The light-emitting assembly of claim 12, wherein the first axis of the light-emitting device is substantially parallel to the edge of the illumination panel.

16. The light-emitting device of claim 1, wherein the device is an LED.

17. The light-emitting device of claim 1, wherein light across substantially the entire interface having a dielectric function that varies spatially according to a pattern.

18. A light-emitting device designed to emit light, the device comprising:

an interface through which emitted light passes therethrough, the interface having a dielectric function that varies spatially according to a pattern,

wherein emitted light is extracted through the pattern and the pattern is arranged to provide anisotropic light emission characterized by a first total light emission on a first plane that is at least 20% greater than a second total light emission on a second plane, wherein the first and second planes are perpendicular to the interface, and wherein the first and second planes are also perpendicular to each other.

19. The device of claim 18, wherein the pattern comprises a plurality of holes formed in the interface.

20. The device of claim 18, wherein the first total light emission on the first plane is at least 50% greater than the second total light emission on the second plane.

21. The device of claim 18, wherein the first total light emission on the first plane is at least 100% greater than the second total light emission on the second plane.

22. The device of claim 18, wherein the pattern conforms to a transformation of a precursor pattern according to a mathematical function.

23. A light-emitting assembly including the device of claim 18, the light-emitting assembly comprising:

an illumination panel associated with the light-emitting device of claim 18 such that light emitted from the light-emitting device passes therethrough, wherein the light-emitting device is arranged to emit light into an edge of the illumination panel.

24. The light-emitting assembly of claim 23, wherein higher intensity emission portions of the anisotropic light emission are substantially aligned with the edge of the illumination panel.

25. The light-emitting assembly of claim 24, further comprising an LCD layer disposed over the illumination panel.

26. The light-emitting assembly of claim 23, wherein the first plane of the light-emitting device is substantially parallel to the illumination panel.

27. The light-emitting device of claim 18, wherein the device is an LED.

28. The light-emitting device of claim 18, wherein light across substantially the entire interface having a dielectric function that varies spatially according to a pattern.