SOLID STATE LIGHTING DEVICE WITH DIFFERENT ILLUMINATION PARAMETERS AT DIFFERENT REGIONS OF AN EMITTER ARRAY

• US 20110305021A1
• Filed: 06/15/2010
• Published: 12/15/2011
• Est. Priority Date: 06/15/2010
• Status: Active Grant

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Micron Technology, Inc.
• Inventors: Xin, Zhang
• Granted Patent: US 8,550,647 B2
• Time in Patent Office: Days
• US Class Current: 362/249.02
• 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 2924/0001 Technical content checked by a classifier
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/005 relating to encapsulations
• CPC Class Codes: H01L 2933/0066 relating to arrangements for conducting electric current to or from the semiconductor body
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

Solid state lighting (SSL) devices and methods of manufacturing such devices. One embodiment of an SSL device comprises a support and an emitter array having a plurality of SSL emitters carried by the support. The emitter array has a central region and a peripheral region outward from the central region. Individual SSL emitters in both the central and the peripheral regions have a primary emission direction along which an intensity of light from the SSL emitters is highest, and the primary emission direction of the SSL emitters in the central region is at least substantially the same direction as the primary emission direction of the SSL emitters in the peripheral region. Additionally, a first coverage area ratio of the SSL emitters in the central region is different than a second coverage area ratio of the SSL emitters in the peripheral region.

Claims

1. A solid state lighting (SSL) device, comprising:

a support having at least a first emission area and a second emission area;

a plurality of SSL emitters arranged in the first and second emission areas, wherein a first coverage area ratio of SSL emitters in the first emission area is different than a second coverage area ratio of SSL emitters in the second emission area.

2. The SSL device of claim 1, wherein:

the support has a front surface;

the first and second emission areas are different regions of the front surface;

the SSL emitters in both the first and second emission areas project light away from the front surface; and

the first coverage area ratio is less than the second coverage area ratio.

3. The SSL device of claim 2, wherein the SSL emitters in the first emission area are spaced apart from at least a portion of neighboring SSL emitters in the first emission area by a first distance and the SSL emitters in the second emission area are spaced apart from at least a portion of neighboring SSL emitters in the second emission area by a second distance less than the first distance.

4. The SSL device of claim 1, wherein the first coverage area ratio is less than the second coverage area ratio.

5. The SSL device of claim 1, wherein the support has a planar support surface and the first and second emission areas are in the same plane as the support surface.

6. The SSL device of claim 1, wherein the support further includes an intermediate area between first and second emission areas, and wherein a density of SSL emitters in the intermediate area is different than the density of SSL emitters in the first and second emission areas.

7. The SSL device of claim 6, wherein the intermediate area is vacant of SSL emitters.

8. The SSL device of claim 1, wherein the SSL emitters in the first emission area are spaced apart from neighboring SSL emitters in the first emission area by a first distance and the SSL emitters in the second emission area are spaced apart from neighboring SSL emitters in the second emission area by a second distance less than the first distance.

9. The SSL device of claim 1, wherein a first density of the SSL emitters in the first emission area is less than a second density of the SSL emitters in the second emission area.

10. The SSL device of claim 1, wherein spacing between adjacent SSL emitters decreases with increasing distance away from a center of the support along a first dimension of the support.

11. The SSL device of claim 1, wherein spacing between adjacent SSL emitters decreases with increasing distance away from the center of the support along first and second dimensions of the support.

12. The SSL device of claim 1, wherein the SSL emitters in the first emission area are smaller than the SSL emitters in the second emission area.

13. The SSL device of claim 1, wherein the SSL emitters in the first emission area have a different shape than the SSL emitters in the second emission area.

14. The SSL device of claim 1, wherein the SSL emitters are arranged in a radial array and the spacing between SSL emitters along a radian decreases with increasing distance from a center of the array.

15. A solid state lighting (SSL) device, comprising:

a support having at least a first emission area and a second emission area outward of the first emission area;

first SSL emitters in the first emission area that project light away from the first emission area of the support, wherein the first SSL emitters cover a first percentage of the first emission area; and

second SSL emitters in the second emission area that project light away from the second emission area of the support, wherein the second SSL emitters cover a second percentage of the second emission area and the second percentage is different than the first percentage.

16. The SSL device of claim 15, further comprising a conditioning element, and wherein the first and second emission areas are configured such that the first and second SSL emitters have primary emission directions directed towards the conditioning element.

17. The SSL device of claim 15, wherein the second percentage is greater than the first percentage.

18. The SSL device of claim 15, further comprising a vacant area between the first and second emission areas.

19. The SSL device of claim 15, further comprising third SSL emitters in third emission areas in corners of the support, wherein the third SSL emitter cover a third percentage of the third emission areas greater than the first percentage.

20. The SSL device of claim 15, wherein the first SSL emitters are spaced apart from each other by a first distance and the second SSL emitters are spaced apart from each other by a second distance less than the first distance.

21. The SSL device of claim 15, wherein the first SSL emitters are smaller than the second SSL emitters.

22. A solid state lighting (SSL) system, comprising:

a support; and

an emitter array having a plurality of SSL emitters carried by the support, the emitter array having a central region and a peripheral region outward from the central region, wherein—

(a) individual SSL emitters in both the central and the peripheral regions have a primary emission direction along which an intensity of light from the SSL emitters is highest;

(b) the primary emission direction of the SSL emitters in the central region is at least substantially the same direction as the primary emission direction of the SSL emitters in the peripheral region; and

(c) a first coverage area ratio of the SSL emitters in the central region is less than a second coverage area ratio of the SSL emitters in the peripheral region.

23. A method for operating an LED system, comprising:

activating a first set of LEDs in a first region of an array of LEDs; and

activating a second set of LEDs in a second region of the array of LEDs located outward of the first region, wherein a coverage ratio of the first set of LEDs is less than a coverage ratio of the second set of LEDs.

24. A method manufacturing an SSL emitter system, comprising:

arranging a first set of SSL emitters in a first emission area of an SSL emitter array; and

arranging a second set of SSL emitters in a second emission area of the SSL emitter array, the second emission area being located outward of the first emission area, and a first coverage area ratio of the first set of SSL emitters in the first emission area is less than a second coverage area ratio of the second set of SSL emitters in the second emission area.