Tilted emission LED array

• US 9,786,811 B2
• Filed: 03/15/2013
• Issued: 10/10/2017
• Est. Priority Date: 02/04/2011
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Rol, Fabian, Tarsa, Eric, Keller, Bernd, Lowes, Theodore D., Emerson, David T.
• Primary Examiner(s): Anya, Igwe U
• Application Number:
  US13/833,272
• Publication Number:
  US 20140117386A1
• Time in Patent Office: 1,670 Days
• Field of Search: 257 88
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

The present disclosure is directed to LED components, and systems using such components, having a light emission profile that may be controlled independently of the lens shape by varying the position and/or orientation of LED chips with respect to one or both of an overlying lens and the surface of the component. For example, the optical centers of the LED emitting surface and the lens, which are normally aligned, may be offset from each other to generate a controlled and predictable emission profile. The LED chips may be positioned to provide a peak emission shifted from a perpendicular centerline of the lens base. The use of offset emitters allows for LED components with shifted or tilted emission patterns, without causing output at high angles of the components. This is beneficial as it allows a lighting system to have tilted emission from the LED component and primary optics.

Claims

1. A light emitting diode (LED) component system comprising:

a housing;

a plurality of LED components within the housing, such that light emitted from the housing comprises a peak emission shifted from a perpendicular centerline of the housing;

each of the plurality of LED components comprising;

at least one LED chip on a mounting surface; and

a primary optical lens on the at least one LED chip and comprising a lens base attached to the mounting surface such that the at least one LED chip and the lens base are aligned along the same plane, wherein the at least one LED chip is displaced in relation to the centerline of said lens base wherein the average peak emission of said at least one LED chip is shifted from a perpendicular centerline of the lens base.

2. The system of claim 1, wherein a center CA of the at least one LED chip is displaced from a center CL of the lens base by a displacement distance D.

3. The system of claim 2, wherein the center CA of the at least one LED chip is displaced from a center CS of the surface of the mounting surface.

4. The system of claim 2, wherein the center CL of the lens base is displaced from a center CS of the surface of the mounting surface.

5. The system of claim 2, further comprising at least one array of LED chips on the mounting surface, the array comprising a center Cx displaced from the center CL of the lens base.

6. The system of claim 2, wherein said at least one LED chip comprises an array of LED chips comprising a primary subsection and at least one additional subsection, the additional subsection being displaced from the primary subsection on the mounting surface, wherein the center CA of the array is defined with respect to the primary subsection and the at least one additional subsection being positioned together.

7. The system of claim 1, wherein the peak emission shifting of light emitted from the housing is achieved at least in part by the LED component structure.

8. The system of claim 1, wherein the at least one LED chip is mounted at a non-zero angle γ

with respect to the mounting surface, the LED chip thereby comprising a tilt τ

with respect to the perpendicular centerline.

9. The system of claim 8, wherein an amount of the non-zero angle γ

lies between approximately 5° and

approximately 35°

, and an amount of the tilt τ

lies between approximately 55° and

85°

.

10. The system of claim 8, wherein a plurality of the at least one LED chips comprise the tilt τ

.

11. The system of claim 10, wherein the plurality of the at least one LED chips comprising the tilt τ

include from about 25% to about 75% of the at least one LED chips.

12. The system of claim 10, wherein an amount of the tilt τ

is the same for each of the at least one LED chips comprising the tilt τ

.

13. The system of claim 10, wherein an amount of the tilt is different for at least one of the LED chips comprising the tilt T from the amount of tilt of another one of the at least one LED chips.

14. The system of claim 1, wherein said at least one LED chip comprises an array of LED chips, wherein a center CA of the array is displaced from a center CL of the lens base by a displacement distance D, and wherein at least one of the LED chips is mounted at a non-zero angle γ

with respect to the mounting surface, the LED chip thereby comprising a tilt τ

with respect to the perpendicular centerline.

15. The system of claim 1, wherein the optical lens comprises an asymmetric shape.

16. The system of claim 1, wherein the peak emission comprises a shift from the perpendicular centerline of between approximately 5 degrees and approximately 30 degrees.

17. The system of claim 16, wherein the peak emission comprises a shift from the perpendicular centerline of between approximately 10 degrees and approximately 20 degrees.

18. The system of claim 1, in which the mounting surface is a substrate.

19. The system of claim 1, in which the mounting surface is a board placed within the housing.

20. The system of claim 1, in which the system comprises a higher optical efficiency than systems with LED components without peak emission shifting.

21. The system of claim 1, in which a lens array is placed over the LED components.

22. The system of claim 1, further comprising a connector for receiving power.

23. The system of claim 1, in which the at least one LED chip comprises a disordered array of LED chips.

24. The system of claim 1, in which the at least one LED chip comprises an array of LED chips.

25. The system of claim 24, in which the array of LED chips comprises an area which comprises an aspect ratio greater than 1.

26. The system of claim 25, in which the area of the array of LED chips is substantially rectangular.

27. The system of claim 25, in which the area of the array of LED chips is irregular.

28. A light emitting diode (LED) component system comprising:

a housing;

a plurality of LED components within the housing, such that light emitted from the housing comprises a peak emission shifted from a perpendicular centerline of the housing;

each of the plurality of LED components comprising;

at least one LED chip on a mounting surface, said mounting surface comprising a board placed within the housing; and

an optical lens on the at least one LED chip and comprising a lens base attached to the mounting surface, wherein the at least one LED chip is positioned at an angle with respect to the mounting surface to provide a peak emission shifted from a perpendicular centerline of the lens base.

29. A light emitting diode (LED) component system comprising:

a housing;

a plurality of LED components within the housing, such that light emitted from the housing comprises a peak emission shifted from a perpendicular centerline of the housing;

each of the plurality of LED components comprising;

at least one LED chip on a mounting surface; and

an optical lens on the at least one LED chip and comprising a lens base attached to the mounting surface, wherein the at least one LED chip is positioned to provide a peak emission shifted from a perpendicular centerline of the lens base, in which the board comprises holes for aligning a secondary optic, wherein the secondary optic is separate from the optical lens.

30. A light emitting diode (LED) component system comprising:

a housing;

a mounting board within the housing;

a plurality of LED components on the mounting board,

each of the plurality of LED components comprising;

at least one LED chip on the mounting board; and

a primary optical lens overlying the at least one LED chip, the optical lens comprising a lens base on a side of the lens adjacent to the at least one LED chip, wherein said at least one LED chip is displaced in relation to the centerline of said lens base, wherein said at least one LED chip is angled with respect to the mounting board, wherein the average peak emission of said at least one LED chip is shifted from a perpendicular centerline of the housing.

31. The system of claim 30, in which the LED chips are positioned to provide a peak emission shifted from a perpendicular centerline of the lens base.

32. The system of claim 31, in which the system comprises a higher optical efficiency than systems with LED components without peak emission shifting.

33. The system of claim 30, wherein a center CA of the at least one LED chip is displaced from a center CL of the lens base by a displacement distance D.

34. The system of claim 33, in which the peak emission shifting of light emitted from the housing is achieved at least in part by LED chip displacement.

35. The system of claim 30, in which the at least one LED chip is mounted on a substrate.

36. The system of claim 35, wherein a center CA of the at least one LED chip is displaced from a center CS of the surface of the substrate.

37. The system of claim 30, in which the LED component is mounted using a chip-on-board configuration.

38. The system of claim 30, wherein at least one of the LED chips is mounted at a non-zero angle γ

with respect to the surface of the mounting surface, the LED chip thereby comprising a tilt τ

with respect to the perpendicular centerline.

39. The system of claim 38, wherein an amount of the non-zero angle γ

lies between approximately 5° and

approximately 35°

, and an amount of the tilt τ

lies between approximately 55° and

85°

.

40. The system of claim 38, wherein an amount of the tilt τ

is the same for each of the at least one LED chips comprising the tilt T.

41. The system of claim 38, wherein an amount of the tilt is different for at least one of the LED chips comprising the tilt τ

from another of the at least one of the LED chips.

42. The system of claim 30, further comprising at least one array of LED chips under the lens, the array comprising a center Cx displaced from a center CL of the lens base.

43. The system of claim 30, wherein the optical lens comprises an asymmetric shape.

44. The system of claim 30, wherein the peak emission comprises a shift from the perpendicular centerline of between approximately 5 degrees and approximately 30 degrees.

45. The system of claim 30, wherein the peak emission comprises a shift from the perpendicular centerline of between approximately 10 degrees and approximately 20 degrees.

46. The system of claim 30, in which a lens array is placed over the LED components.

47. The system of claim 30, in which the board comprises holes for aligning a secondary optic.

48. The system of claim 30, further comprising a connector on the board for receiving power.

49. The system of claim 30, in which the at least one LED chip comprises a disordered array of LED chips.

50. The system of claim 30, in which the at least one LED chip comprises an array of LED chips.

51. The system of claim 50, in which the array of LED chips comprises an area which comprises an aspect ratio greater than 1.

52. The system of claim 51, in which the area of the array of LED chips is substantially rectangular.

53. The system of claim 51, in which the area of the array of LED chips is irregular.

54. A light emitting diode (LED) component system comprising:

a housing;

a mounting board within the housing;

a plurality of LED components on the mounting board,

each of the plurality of LED components comprising;

at least one LED chip on the mounting board; and

a primary optical lens overlying the at least one LED chip, the optical lens comprising a lens base on a side of the lens adjacent to the at least one LED chip, wherein said at least one LED chip is displaced in relation to the centerline of said lens base, wherein the average peak emission of said at least one LED chip is shifted from a perpendicular centerline of the housing, wherein the at least one LED chip comprises an array of LED chips which comprises a primary subsection and at least one additional subsection, the additional subsection being displaced from the primary subsection under the lens, wherein a center CA of the array is defined with respect to the primary subsection and the at least one additional subsection being positioned together.