Light emitting devices including multiple anodes and cathodes

Patent metadata

Field	Value
Publication number	US-9515055-B2
Application number	US-201213471164-A
Country	US
Kind code	B2
Filing date	May 14, 2012
Priority date	May 14, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

Solid state (e.g., LED) lighting devices include multiple emitters mounted on or over a substrate comprising insulating material with conductive traces thereon, with various emitters being independently controllable with multiple pairs of anodes and cathodes that may be arranged on an opposite surface of the substrate than the emitters. Electrically conductive vias may be defined through the insulating substrate, and a molded lens may be provided over the substrate and emitters mounted thereon. Various combinations of independently controllable emitters or emitter groups may be provided, for example, a red emitter in combination with multiple blue shifted yellow (BSY) emitters, or separately controllable red, green, blue, and white (e.g., BSY) emitters.

First claim

What is claimed is:

1. A light emitting diode (LED) device comprising:
a substrate comprising insulating material and including a top surface, a bottom surface, and a plurality of side walls extending between the top surface and the bottom surface;
a plurality of LEDs mounted on or over the top surface; and
a plurality of anodes and a plurality of cathodes arranged on the bottom surface and in conductive electrical communication with the plurality of LEDs;
wherein at least a first LED of the plurality of LEDs is in conductive electrical communication with a first anode of the plurality of anodes and with a first cathode of the plurality of cathodes; wherein at least a second LED of the plurality of LEDs is in conductive electrical communication with a second anode of the plurality of anodes and with a second cathode of the plurality of cathodes; and
wherein the LED device is devoid of any anode or cathode arranged on, or extending laterally beyond, any side wall of the LED device.

2. A LED device according to claim 1 , further comprising a plurality of electrically conductive vias defined in the substrate between the top surface and the bottom surface, wherein each via of the plurality of electrically conductive vias is in conductive electrical communication with (i) at least one LED of the plurality of LEDs, and (ii) either a different anode of the plurality of anodes or a different cathode of the plurality of cathodes.

3. A LED device according to claim 1 , further comprising a plurality of electrically conductive die attach pads arranged between the plurality of LEDs and the top surface.

4. A LED device according to claim 1 , further comprising a unitary lens arranged over the plurality of LEDs.

5. A LED device according to claim 1 , wherein the at least a first LED comprises at least one LED comprising a peak wavelength in a range of from 430 nm to 480 nm and arranged to stimulate at least one lumiphor comprising a peak wavelength in a range of from 500 nm to 560 nm, and the at least a second LED comprises at least one LED comprising a peak wavelength in a range of from 600 nm to 660 nm.

6. A LED device according to claim 1 , comprising at least one of the following features (i) or (ii): (i) the at least a first LED comprises a plurality of first LEDs; or (ii) the at least a second LED comprises a plurality of second LEDs.

7. A LED device according to claim 1 , wherein:
the at least a first LED comprises a first blue LED arranged to stimulate emissions of a first yellow lumiphor disposed on the first blue LED;
the at least a second LED comprises a second blue LED arranged to stimulate emissions of a second yellow lumiphor disposed on the second blue LED; and
at least a third LED of the plurality of LEDs comprises a red LED and is in conductive electrical communication with a third anode of the plurality of anodes and with a third cathode of the plurality of cathodes.

8. A LED device according to claim 1 , wherein:
at least a third LED of the plurality of LEDs is in conductive electrical communication with a third anode of the plurality of anodes and with a third cathode of the plurality of cathodes;
the at least a first LED includes a first LED comprising a first peak wavelength;
the at least a second LED includes a second LED comprising a second peak wavelength;
the at least a third LED includes a third LED comprising a third peak wavelength;
the first peak wavelength is within 20 nm of the second peak wavelength; and
the third peak wavelength differs from each of the first peak wavelength and the second peak wavelength by at least 40 nm.

9. A LED device according to claim 1 , wherein:
the at least a first LED comprises a first red LED;
the at least a second LED comprises a second green LED;
at least a third LED of the plurality of LEDs comprises a third blue LED and is in conductive electrical communication with a third anode of the plurality of anodes and with a third cathode of the plurality of cathodes; and
at least a fourth LED of the plurality of LEDs comprises a fourth blue LED arranged to stimulate emissions of a yellow lumiphor disposed on or over the fourth blue LED, wherein the fourth blue LED is in conductive electrical communication with a fourth anode of the plurality of anodes and with a fourth cathode of the plurality of cathodes.

10. A light emitting diode (LED) device comprising:
a substrate comprising insulating material and including a top surface, a bottom surface, and a plurality of side walls extending between the top surface and the bottom surface;
a plurality of die attach pads patterned in or on the top surface;
a plurality of LEDs mounted to the plurality of die attach pads; and
a plurality of electrically conductive vias defined in the substrate between the top surface and the bottom surface;
wherein at least a first LED of the plurality of LEDs is in conductive electrical communication with a first pair of vias of the plurality of electrically conductive vias;
wherein at least a second LED of the plurality of LEDs is in conductive electrical communication with a second pair of vias of the plurality of electrically conductive vias that differs from the first pair of vias; and
wherein the LED device is devoid of any anode or cathode arranged on, or extending laterally beyond, any side wall of the LED device.

11. A LED device according to claim 10 , comprising a plurality of anodes and a plurality of cathodes arranged on the bottom surface and in conductive electrical communication with the plurality of electrically conductive vias, wherein the plurality of anodes and the plurality of cathodes includes (i) a first anode/cathode pair in conductive electrical communication with the first pair of vias, and (ii) a second anode/cathode pair in conductive electrical communication with the second pair of vias.

12. A LED device according to claim 11 , wherein the at least a first LED and the at least a second LED are independently controllable using the first anode/cathode pair and the second anode/cathode pair.

13. A LED device according to claim 10 , wherein:
the at least a first LED comprises a first blue LED arranged to stimulate emissions of a first yellow lumiphor disposed on the first blue LED;
the at least a second LED comprises a second blue LED arranged to stimulate emissions of a second yellow lumiphor disposed on the second blue LED; and
the plurality of LEDs includes at least a third LED, and the at least a third LED comprises a red LED.

14. A light emitting diode (LED) device comprising:
a plurality of LEDs mounted on or over a top surface of a substrate that comprises a ceramic material, a bottom surface, and a plurality of side walls extending between the top surface and the bottom surface;
a molded lens arranged over the plurality of LEDs and arranged to transmit light generated by the plurality of LEDs; and
a plurality of anodes and a plurality of cathodes arranged on the bottom surface and in conductive electrical communication with the plurality of LEDs, wherein the plurality of anodes includes a first anode and a second anode, and the plurality of cathodes includes a first cathode and a second cathode;
wherein at least two LEDs of the plurality of LEDs are independently controllable using the plurality of anodes and the plurality of cathodes; and
wherein the LED device is devoid of any anode or cathode arranged on, or extending laterally beyond, any side wall of the LED device.

15. A LED device according to claim 14 , further comprising a plurality of electrically conductive vias defined in the substrate between the top surface and t

Assignees

• Britt Jeffrey Carl
• Laughner Michael P
• Cree Inc

Inventors

• Britt Jeffrey Carl
• Laughner Michael P
• Stanton Brandon

Classifications

• H10W72/5445

  being orthogonal to a side surface of the chip, e.g. parallel arrangements · CPC title

• H10W72/5363

  the connected ends being wedge-shaped · CPC title

• H10W72/536

  the connected ends being ball-shaped · CPC title

• H10W90/00 Primary

  Package configurations · CPC title

• Y10S362/80

  Light emitting diode · CPC title