Arrangement of solid state light sources and lamp using same

• US 8,928,023 B1
• Filed: 08/08/2013
• Issued: 01/06/2015
• Est. Priority Date: 08/08/2013
• Status: Expired due to Fees

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Coleiny, Golshan, Zhang, Shiyong
• Primary Examiner(s): AHMED, SELIM U
• Application Number:
  US13/962,377
• Time in Patent Office: 516 Days
• Field of Search: 257/98, 257/99, 257/E23.01, 362/249.02, 362/231, 362/555, 313/498
• US Class Current: 257/98
• CPC Class Codes: F21S 10/023 by selectively switching fixed light sources
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 23/04 the elements being switches safety devices F21V25/00
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 27/153 in a repetitive configuration, e.g. LED bars
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]

Abstract

Arrangements of solid state light sources for color-mixing, and light sources including the same, are provided. A substrate has a plurality of different color LED chips coupled thereto. The emitted light is mixed to produce a white light output. The LED chips are arranged on the substrate in a manner that improves color-mixing, for example, by forming LED sets including one or more LED chips of different colors, by skewing the LED chips, and/or by forming a non-rectangular array or a circular array of LED sets and/or chips. The color-mixing LED arrangement may be used in a lamp or other light source together with collimating optics to collimate and further mix the color-mixed light output from the LED arrangement. The color-mixing LED arrangement may be provided as a single package with multiple LED chips or as multiple packages of one or more LED chips.

Claims

1. An arrangement of solid state light sources, comprising:

a substrate (112, 312, 712); and

a plurality of solid state light source sets (111, 311a-g, 711a-g) arranged on respective solid state light source regions of the substrate (112, 312, 712), each of the solid state light source sets including at least a first color solid state light source chip (114, 314, 714), a second color solid state light source chip (115, 315, 715), and a third color solid state light source chip (116, 316, 716),

wherein within each said light source set (111, 311a-g, 711a-g) said first, second, and third solid state light source chips (114-115, 314-316, 714-716) are coupled to the substrate (112, 312, 712) and are arranged immediately adjacent to each other, the first color solid state light source chip (114, 314, 714) being configured to emit light of a first wavelength, the second color solid state light source chip (115, 315, 715) being configured to emit light of a second wavelength different than the first wavelength, and the third color solid state light source chip (116, 316, 716) being configured to emit light of a third wavelength different than the first and the second wavelengths,

wherein each of the solid state light source sets (111, 311a-g, 711a-g) is immediately adjacent at least two other solid state light source sets (111, 311a-g, 711a-g), wherein the solid state light source chips (114-115, 314-316, 714-716) in at least one of the solid state light source sets (111, 311a-g, 711a-g) are skewed relative to the solid state light source chips(114-115, 314-316, 714-716) in at least another of the solid state light source sets (111, 311a-g, 711a-g), and

wherein at least a subset of the solid state light source sets (111, 311a-g, 711a-g), said subset comprising at least half of all the solid state light source sets (111, 311a-g, 711a-g) on said substrate (112, 312, 712), is located on an imaginary circle (318), respective said solid state light source sets (111, 311a-g, 711a-g) within said subset being spaced from an immediately adjacent solid state light source set (111, 311a-g, 711a-g) by a distance exceeding a separation amount between immediately adjacent first, second, and third solid state light source chips (114-115, 314-316, 714-716) within each solid state light source set (111, 311a-g, 711a-g), and

wherein the first color solid state light source chips (114, 314, 714) are connected in electrical series defining a first string comprising a plurality of said first color solid state light source chips (114, 314, 714), the second color solid state light source chips (115, 315, 715) are connected in electrical series defining a second string comprising a plurality of said second color solid state light source chips (115, 315, 715, and the third color solid state light source chips (116, 316, 716) are connected in electrical series defining a third string comprising a plurality of said third color solid state light source chips (116, 316, 716), and

wherein the first, second and third strings of solid state light source chips (114-116, 314-316, 714-716) are arranged in approximate concentric first, second and third circles each generally concentric with said imaginary circle (318).

2. The arrangement of solid state light sources of claim 1, wherein the solid state light source chips (114-116, 314-316, 714-716) form a non-rectangular array on the substrate (112, 312, 712).

3. The arrangement of solid state light sources of claim 1, wherein the solid state light source sets (111, 311a-g, 711a-g) form a circular array on the substrate (112, 312, 712).

4. The arrangement of solid state light sources of claim 1, wherein a ratio of first color solid state light source chips (114, 314, 714) to second color solid state light source chips (115, 315, 715) in each of the solid state light source sets (111, 311a-g, 711a-g) is the same as the ratio of first color solid state light source chips (114, 314, 714) to second color solid state light source chips (115, 315, 715) on the substrate (112, 312, 712).

5. The arrangement of solid state light sources of claim 1, wherein the first wavelength corresponds to light of a green color, and wherein the second wavelength corresponds to light of a red color.

6. The arrangement of solid state light sources of claim 1, wherein the first wavelength corresponds to light of a green color, wherein the second wavelength corresponds to light of a red color, and wherein the third wavelength corresponds to light of a blue color.

7. The arrangement of solid state light sources of claim 1, wherein each of the solid state light source sets (111, 311a-g, 711a-g) includes a predefined pattern of only one of each said first, second, and third color solid state light source chips (114-116, 314-316, 714-716).

8. The arrangement of solid state light sources of claim 1, wherein each of the solid state light source sets (111, 311a-g, 711a-g) provides a first to second to third color solid state light source chip ratio of 1:

1;

1.

9. The arrangement of solid state light sources of claim 1, further comprising a further said solid state light source set (311g) disposed at approximately a center of said imaginary circle (318).

10. The arrangement of solid state light sources of claim 1, wherein the first, second and third color solid state light source chips (114-116, 314-316, 714-716) comprise light emitting diodes (LEDs).

11. The arrangement of solid state light sources of claim 1, wherein each of the solid state light source sets (311a-g) includes a fourth color solid state light source chip (317) configured to emit white light.

12. The arrangement of solid state light sources of claim 1, wherein each of the solid state light source sets (311a-g) includes a fourth color solid state light source chip (317) configured to emit light of a fourth wavelength, said fourth wavelength being different than said first, second and third wavelengths.

13. The arrangement of solid state light sources of claim 12, wherein each of the solid state light source sets (311a-g) includes a predefined pattern of only one of each said first, second, third and fourth color solid state light source chips (314-317).

14. The arrangement of solid state light sources of claim 12, wherein the first wavelength corresponds to light of a green color, wherein the second wavelength corresponds to light of a red color, wherein the third wavelength corresponds to light of a blue color, and wherein the fourth wavelength corresponds to light of a yellow color.

15. The arrangement of solid state light sources of claim 1, wherein the solid state light source chips (114-116, 314-317, 714-716) each comprise a die packaged with a respective optic.