Lighting device and apparatus with spectral converter within a casing

• US 8,876,312 B2
• Filed: 03/05/2013
• Issued: 11/04/2014
• Est. Priority Date: 03/05/2013
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Tan, Kheng Leng, Poh, Ju Chin, Ng, Keat Chuan, Chan, Chuan Hoe, Ng, Kwok Yuen, Wong, Kum Soon
• Primary Examiner(s): Alavi, Ali
• Application Number:
  US13/785,924
• Publication Number:
  US 20140254127A1
• Time in Patent Office: 609 Days
• Field of Search: 362/231, 362/84, 257/502, 257/503, 257/620, 438/462, 438/29, 438/113, 438/114
• US Class Current: 362/84
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• 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 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body

Abstract

In one embodiment, a light-emitting device having a substrate, a casing, a plurality of light source dies, a plurality of spectral converters and a plurality of optical structures is disclosed. The spectral converters may be configured to spectrally adjust a portion of the light output of the light source die into a first and second converted spectral output that is substantially different from one another. In another embodiment, a system for illumination having a plurality of lighting assemblies has been disclosed. Each of the lighting assemblies comprises a light source die and a spectral converter. The spectral converter is configured to spectrally adjust the light output of the light source die so that the plurality of lighting assemblies are configured to emit substantially different spectral output. In yet another embodiment, a lighting apparatus having a primary spectral converter and a secondary spectral converter is disclosed.

Claims

1. A system for illumination, comprising:

a plurality of lighting assemblies;

each member of the plurality of lighting assemblies comprising a respective light source die having a respective source spectral output, and a respective spectral converter selected to adjust a respective portion of the respective source spectral output into a respective converted spectral output;

wherein the source spectral outputs are substantially similar to human eyes; and

wherein the spectral converters are selected to be different from one another, and are selected to adjust the source spectral outputs differently into converted spectral outputs that are substantially dissimilar to human eyes.

2. A system as recited in claim 1 wherein each of the plurality of lighting assemblies further comprises a respective casing, and wherein each of the spectral converters is formed within the respective casing and is arranged proximate to the respective light source die.

3. A system as recited in claim 1 wherein each of the spectral converters comprises a respective set of a plurality of spectral converting materials.

4. A system as recited in claim 3 wherein the sets have a plurality of corresponding members of substantially different spectral converting materials, and wherein the corresponding members of substantially different spectral converting materials comprise at least one common spectral converting material that is present in the sets in substantially different amounts.

5. A light-emitting device, comprising:

a substrate;

a plurality of light source dies coupled with the substrate and configured to emit substantially similar source spectral outputs;

a casing coupled to the substrate enclosing at least partially the plurality of light source dies;

a plurality of spectral converters formed within the casing, the plurality of spectral converters being optically coupled to, but distanced away from, the plurality of light source dies;

wherein the plurality of spectral converters are configured to adjust the substantially similar source spectral outputs into at least a first converted spectral output and a second converted spectral output that are substantially different to human eyes.

6. A light-emitting device as recited in claim 5 wherein the plurality of spectral converters are configured to adjust the substantially similar source spectral outputs into a third converted spectral output that is substantially different from the first and second converted spectral outputs.

7. A light-emitting device as recited in claim 5 further comprising an alternative casing and a plurality of alternative spectral converters formed within the alternative casing, wherein the plurality of alternative spectral converters are configured to adjust the substantially similar source spectral outputs into at least one alternative converted spectral output that is substantially different from the first and second converted spectral outputs when the alternative casing is optically coupled to the plurality of light source dies and is substituted in place of the casing.

8. A light-emitting device as recited in claim 5 wherein the casing comprises a plurality of optical structures having the plurality of spectral converters.

9. A light-emitting device as recited in claim 8 wherein each member of the plurality of light source dies is configured to be optically coupled to one of the plurality of optical structures respectively.

10. A light-emitting device as recited in claim 9, wherein:

the light-emitting device further comprises at least one additional colored light source die configured to emit colored source spectral output;

the casing comprises at least one additional substantially transparent optical structure optically coupled to the at least one additional colored light source die.

11. A light-emitting device as recited in claim 8 wherein:

the plurality of optical structures comprises at least one primary optical structure and at least one secondary optical structure;

the at least one primary optical structure is optically coupled with at least one of the light source dies and is configured to transmit a first corresponding portion of the source spectral outputs;

the plurality of spectral converters are selected such that the first corresponding portion of the source spectral outputs is adjusted into the first converted spectral output;

the at least one secondary optical structure is optically coupled with the at least another one of the light source dies and is configured to transmit a second corresponding portion of the source spectral outputs; and

the plurality of spectral converters are selected such that the second corresponding portion of the source spectral outputs is adjusted into the second converted spectral output.

12. A light-emitting device as recited in claim 11 wherein:

the plurality of light source dies comprises at least one dominant light source die optically coupled to the at least one primary optical structure 350a; and

the at least one dominant light source die is configured to emit more light relative to any other one of the plurality of light source dies.

13. A light-emitting device as recited in claim 8 wherein each optical structure comprises a cavity, and wherein each optical structure is configured to enclose at least one of the plurality of light source dies within the cavity such that the spectral output from the at least one of the light source dies is transmitted substantially through the respective optical structure.

14. A lighting apparatus, comprising:

at least one primary light source die;

at least one secondary light source die being arranged adjacent to the at least one primary light source die;

a casing;

at least one primary optical structure arranged on the casing proximate to the at least one primary light source die;

at least one secondary optical structure arranged on the casing proximate to the at least one secondary light source die;

a primary spectral converter formed within the at least one primary optical structure;

at least one secondary spectral converter formed within the at least one secondary optical structure;

wherein the at least one primary light source die is configured to emit a primary source spectral output and the at least one secondary light source die is configured to emit a secondary source spectral output that is substantially similar to the primary source spectral output; and

wherein the primary spectral converter is configured to adjust the primary source spectral output of the at least one primary light source die into a primary converted spectral output, and the at least one secondary spectral converter is configured to adjust the secondary source spectral output of the at least one secondary light source die into at least one secondary converted spectral output that is substantially different from the primary converted spectral output.

15. A lighting apparatus as recited in claim 14 wherein:

the primary converted spectral output has a first color rendering index;

the primary converted spectral output and the at least one secondary converted spectral output are mixed to obtain a combined spectral output having a second color rendering index;

the at least one secondary spectral converter is selected such that the second color rendering index is substantially higher than the first color rendering index.

16. A lighting apparatus as recited in claim 15 wherein the casing further comprises at least one substantially transparent portion.

17. A lighting apparatus as recited in claim 16 further comprising an additional secondary light source die optically coupled to the at least one substantially transparent portion of the casing.

18. A lighting apparatus as recited in claim 17 wherein the additional light source die is configured to emit an additional source spectral output that is predominantly light of a single color.

19. A lighting apparatus as recited in claim 18 wherein:

the primary converted spectral output has a first color rendering index; and

the primary converted spectral output and the at least one secondary converted spectral output and the additional source spectral output are all mixed together so as to provide a combined spectral output having a second color rendering index that is substantially higher than the first color rendering index of the primary converted spectral output.

20. A lighting apparatus of claim 19 wherein the primary converted spectral output is at least approximately 50% of the combined spectral output.