High efficiency LEDs and LED lamps

Patent metadata

Field	Value
Publication number	US-9559150-B2
Application number	US-201615088821-A
Country	US
Kind code	B2
Filing date	Apr 1, 2016
Priority date	Jun 27, 2009
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

In various embodiments, lighting systems include an electrically insulating carrier having a plurality of conductive elements disposed thereon and a light-emitting array. The light-emitting array is disposed over the carrier and includes a plurality of light-emitting diodes (LEDs) that are interconnected in parallel in a first direction and interconnected in series in a second direction different from the first direction.

First claim

What is claimed is:

1. A lighting system comprising:
an electrically insulating carrier having a plurality of conductive elements disposed thereon; and
a two-dimensional light-emitting array of light-emitting diodes (LEDs) disposed over the carrier, LEDs within the array being interconnected in parallel in a first direction and interconnected in series in a second direction different from the first direction,
wherein (i) each LED has at least two electrical contacts, (ii) each electrical contact is electrically connected to a conductive element by an electrical connection comprising a conductive adhesive, and (iii) at least one LED comprises a light-conversion material.

2. The lighting system of claim 1 , wherein the first direction is substantially orthogonal to the second direction.

3. The lighting system of claim 1 , wherein, in the event of one LED in the light-emitting array becoming non-operational, the other LEDs within the light-emitting array remain operational.

4. The lighting system of claim 1 , wherein the electrically insulating carrier comprises a polymeric material.

5. The lighting system of claim 1 , wherein at least one LED comprises a packaged LED.

6. The lighting system of claim 1 , wherein the light-conversion material comprises a phosphor.

7. The lighting system of claim 1 , wherein at least one LED comprises a bare-die LED.

8. The lighting system of claim 1 , wherein the electrically insulating carrier is flexible.

9. The lighting system of claim 1 , wherein the electrically insulating carrier is reflective to at least one of (i) a wavelength of light emitted by at least one of the LEDs or (ii) a wavelength of light emitted by the light-conversion material.

10. The lighting system of claim 1 , wherein the electrically insulating carrier is substantially transparent to at least one of (i) a wavelength of light emitted by at least one of the LEDs or (ii) a wavelength of light emitted by the light-conversion material.

11. The lighting system of claim 1 , wherein at least one of the LEDs comprises a semiconductor material comprising at least one of silicon, SiC, GaAs, Al x In y Ga 1-x-y P z N t As 1-t-z , Al x In y Ga 1-x-y N, ZnO, or mixtures or compounds thereof.

12. The lighting system of claim 1 , wherein at least one of the LEDs emits UV, blue, or green light.

13. The lighting system of claim 1 , wherein at least one of (i) light emitted from the light-conversion material or (ii) a mixture of light emitted from the at least one of the LEDs and the light-conversion material comprises white light.

14. The lighting system of claim 1 , further comprising electrical circuitry for selectively turning off various ones of the LEDs, thereby dimming a light output of the light-emitting array.

15. The lighting system of claim 1 , wherein at least one first LED emits light having a color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution different from a color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution of at least one second LED.

16. The lighting system of claim 1 , wherein at least one first LED of the light-emitting array is associated with a first light conversion material having a first optical characteristic, and at least one second LED of the light-emitting array is associated with a second light conversion material having a second optical characteristic different from the first optical characteristic.

17. The lighting system of claim 1 , wherein at least one first LED of the light-emitting array is associated with an optical element of a first type, and at least one second LED of the light-emitting array is associated with an optical element of a second type different from the first type.

18. The lighting system of claim 1 , wherein:
the light-emitting array comprises (i) a first group of one or more LEDs, and (ii) a second group of one or more LEDs different from the first group,
activation of the first group and deactivation of the second group produces light having a first color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution, and
activation of the second group and deactivation of the first group produces light having a second color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution different from the first color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution.

19. The lighting system of claim 1 , wherein:
the light-emitting array comprises a first group of one or more LEDs and, associated with at least one of the LEDs of the first group, a first optical element of a first type,
the light-emitting array comprises a second group, different from the first group, of one or more LEDs and, associated with at least one of the LEDs of the second group, a second optical element of a second type different from the first type,
activation of the first group and deactivation of the second group produces light having a first color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution, and
activation of the second group and deactivation of the first group produces light having a second color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution different from the first color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution.

20. The lighting system of claim 1 , wherein:
the light-emitting array comprises a first group of one or more LEDs and, associated with at least one of the LEDs of the first group, a first light-conversion material having a first optical characteristic,
the light-emitting array comprises a second group, different from the first group, of one or more LEDs and, associated with at least one of the LEDs of the second group, a second light-conversion material having a second optical characteristic different from the first optical characteristic,
activation of the first group and deactivation of the second group produces light having a first color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution, and
activation of the second group and deactivation of the first group produces light having a second color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution different from the first color, color temperature, intensity, efficiency, color rendering index, or spectral light distribution.

21. The lighting system of claim 1 , wherein at least one LED comprises a substrate that is substantially transparent to a wavelength of light emitted by the at least one LED.

22. The lighting system of claim 1 , wherein at least one LED comprises a substrate that is substantially transparent to at least one of (i) a wavelength of light emitted by the at least one LED or (ii) a wavelength of light emitted by the light-conversion material.

23. The lighting system of claim 1 , wherein at least one LED in the light-emitting array lacks a light-conversion material.

24. The lighting system of claim 1 , wherein at least one first LED is configured for emission of white light and at least one second LED is configured for emission of red light.

25. The lighting system of claim 1 , further comprising:
a second electrically insulating carrier having a pluralit

Assignees

• Tischler Michael A
• Odnoblyudov Vladimir
• Keogh David
• Cooledge Lighting Inc

Inventors

• Tischler Michael A
• Odnoblyudov Vladimir
• Keogh David

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21Y2105/10

  comprising a two-dimensional [2D] array of point-like light-generating elements · CPC title

• F21K9/64

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title

• H10W90/00

  Package configurations · CPC title

• H10W90/754

  between a chip and a stacked insulating package substrate, interposer or RDL · CPC title