Multiple color lighting element cluster tiles for solid state lighting panels

• US 7,993,021 B2
• Filed: 11/17/2006
• Issued: 08/09/2011
• Est. Priority Date: 11/18/2005
• Status: Active Grant

• Current Assignee: CREE Led Incorporated (Smart Global Holdings Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Roberts, John K., Sims, Paul E., You, Chenhua
• Primary Examiner(s): CARIASO, ALAN B
• Application Number:
  US11/601,295
• Publication Number:
  US 20070115670A1
• Time in Patent Office: 1,726 Days
• Field of Search: 362/231, 362/230, 362/249, 362/800, 362/612, 362/613, 362/555, 362 84- 85, 362 971- 974, 362/561, 362/249.02, 362/249.05, 362/249.06, 345/82, 345/83, 313/498, 313/500, 315 56- 59, 315/185.S, 315/200.A, 315312-326, 349/68, 349/108, 349/61, 257 88- 89, 257/98
• US Class Current: 362/97.3
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources
• CPC Class Codes: G09F 9/35 being liquid crystals G09F9/302 takes precedence; liquid crystal materials C09K19/00; liquid crystal panels comprising a number of electrodes in a single cell per se G02F1/13
• CPC Class Codes: H01L 2224/45014 Ribbon connectors, e.g. rectangular cross-section
• CPC Class Codes: H01L 2224/45124 Aluminium (Al) as principal constituent
• CPC Class Codes: H01L 2224/49175 Parallel arrangements
• CPC Class Codes: H01L 2224/85205 Ultrasonic bonding
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/206 Length ranges
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: H05K 1/142 Arrangements of planar printed circuit boards in the same plane, e.g. auxiliary printed circuit insert mounted in a main printed circuit
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: H05K 3/0058 Laminating printed circuit boards onto other substrates, e.g. metallic substrates H05K1/0281 takes precedence
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A solid state lighting tile includes a substrate and a plurality of lighting element clusters on a surface of the substrate. Respective ones of the plurality of lighting element clusters include first and second mounting positions configured to receive solid state light emitting devices, and at least first and second ones of the solid state lighting element clusters may be electrically connected in series. The tile further includes a plurality of solid state light emitting devices configured to emit a first color light, and respective ones of the solid state light emitting devices may be mounted in respective ones of the plurality of solid state lighting element clusters. One of the first color light emitting devices is mounted in the first mounting position of the first solid state lighting element cluster and a second of the first color light emitting devices is mounted in the second mounting position of the second solid state lighting element cluster.

Claims

1. A solid state lighting tile, comprising:

a substrate;

a plurality of lighting element clusters on a surface of the substrate, wherein respective ones of the plurality of lighting element clusters include first, second and third mounting positions configured to receive solid state light emitting devices;

a plurality of first solid state light emitting devices configured to emit a first color light, a plurality of second solid state light emitting devices configured to emit a second color light, and a plurality of third solid state light emitting devices configured to emit a third color light, wherein respective ones of the first, second and third solid state light emitting devices are mounted in respective ones of the plurality of lighting element clusters so that respective ones of the lighting element clusters include a first solid state light emitting device, a second solid state light emitting device, and a third solid state light emitting device,

wherein the plurality of lighting element clusters are provided in first and second lines of lighting element clusters including a first lighting element cluster in the first line of lighting element clusters and second and third lighting element clusters adjacent one another in the second line of lighting element clusters, the first, second and third neighboring lighting element clusters defining a triangular region therebetween;

wherein the first solid state lighting devices in the first line of lighting element clusters are connected in a first series electrical connection to form a first string, the second solid state lighting devices in the first line of lighting element clusters are connected in a second series electrical connection to form a second string, and the third solid state lighting devices in the first line of lighting element clusters are connected in a third series electrical connection to form a third string; and

wherein the lighting element clusters are configured such that the mounting positions of respective first, second and third light emitting devices in one of the first, second and third lighting element clusters are not repeated in others of the first, second and third lighting element clusters.

2. The solid state lighting tile of claim 1, wherein the first mounting position of a lighting element cluster is rotationally offset from the second mounting position of the lighting element cluster relative to a center of the lighting element cluster.

3. The solid state lighting tile of claim 2, wherein the third mounting position of the lighting element cluster is rotationally offset from the first and second mounting positions relative to the center of the lighting element cluster.

4. The solid state lighting tile of claim 1, wherein the plurality of lighting element clusters comprise a first group of lighting element clusters arranged along a first line and a second group of lighting element clusters arranged along a second line that is parallel to the first line, wherein the second group of lighting element clusters is laterally offset from the first group of lighting element clusters.

5. The solid state lighting tile of claim 4, wherein the second group of lighting element clusters is offset from the first group of lighting element clusters by a distance d that is about half the spacing between adjacent ones of the lighting element clusters in the first group of lighting element clusters.

6. The solid state lighting tile of claim 4, wherein respective first, second and third mounting positions in neighboring lighting element clusters in the first line are rotationally offset from one another by one mounting position in a clockwise direction relative to centers of the respective lighting element clusters, and respective first, second and third mounting positions in neighboring lighting element clusters in the second line are rotationally offset from one another by one mounting position in a counterclockwise direction relative to centers of the respective lighting element clusters.

7. A backlight for an LCD display including a solid state lighting tile as recited in claim 1.

8. A solid state luminaire including a solid state lighting tile as recited in claim 1.

9. The solid state lighting tile of claim 1, wherein respective first, second and third mounting positions in the first lighting element cluster are rotationally offset from respective first, second and third mounting positions in the second lighting element cluster by one mounting position in a clockwise direction relative to centers of the respective lighting element clusters, and respective first, second and third mounting positions in the first lighting element cluster are rotationally offset from respective first, second and third mounting positions in the third lighting element cluster by one mounting position in a counterclockwise direction relative to centers of the respective lighting element clusters.

10. The solid state lighting tile of claim 1, wherein mounting positions of respective first, second and third solid state lighting devices in the second lighting element cluster are rotationally offset relative to mounting positions of respective first, second and third solid state lighting devices in the third lighting element cluster.

11. The solid state lighting tile of claim 1, wherein the first, second and third lighting element clusters are arranged in an equilateral triangle.

12. The solid state lighting tile of claim 11, further comprising a retention hole in the substrate, wherein the retention hole is positioned at the center of the equilateral triangle defined by the first, second and third lighting element clusters.

13. The solid state lighting tile of claim 1, wherein each of the lighting element clusters comprises a dielectric substrate, a plurality of die attach pads on the dielectric substrate wherein the solid state lighting devices comprise light emitting diodes mounted on the die attach pads, a solder mask on the dielectric substrate including an opening exposing the die attach pads, and an encapsulant dome covering the die attach pads and the solid state lighting devices and extending onto the solder mask.

14. The solid state lighting tile of claim 1, wherein each of the lighting element clusters comprises a dielectric substrate, a plurality of die attach pads on the dielectric substrate, and a plurality of wirebond pads on the substrate, wherein die attach pads in the second lighting element cluster are electrically coupled by parallel traces to the wirebond pads in the third lighting element cluster.

15. The solid state lighting tile of claim 1, wherein each of the lighting element clusters comprises a dielectric substrate, a plurality of die attach pads on the dielectric substrate, and a plurality of wirebond pads on the substrate, wherein die attach pads in respective ones of the lighting element clusters are coupled via electrical traces to respective wirebond pads in lighting element clusters adjacent to the respective lighting element clusters.

16. The solid state lighting tile of claim 1, wherein mounting positions of respective first, second and third solid state lighting devices in the first lighting element cluster are rotationally offset relative to mounting positions of respective first, second and third solid state lighting devices in the second lighting element cluster and respective first, second and third solid state lighting devices in the third lighting element cluster.

17. The solid state lighting tile of claim 1, wherein the first solid state lighting devices in the first string of lighting element clusters are configured to be driven by a first common current signal, the second solid state lighting devices in the first string of lighting element clusters are configured to be driven by a second common current signal, and the third solid state lighting devices in the first string of lighting element clusters are configured to be driven by a third common current signal.

18. The solid state lighting tile of claim 1, wherein the triangular region defined by the first, second and third neighboring lighting element clusters is free of light emitting devices.

19. The solid state lighting tile of claim 1, wherein the first, second and third strings include respective first, second and third anode contacts at a first end of the tile and respective first, second and third cathode contacts at a second end of the tile opposite the first end of the tile.

20. A solid state lighting tile, comprising:

a plurality of lighting element clusters on a surface of the tile, each of which is configured to receive a plurality of different color LEDs, wherein at least two of the lighting element clusters are configured to receive the different color LEDs at different mounting positions therein;

wherein the plurality of lighting element clusters are provided in first and second lines of lighting element clusters and wherein a first lighting element cluster is in the first line of lighting element clusters and wherein second and third lighting element clusters are adjacent one another in the second line of lighting element clusters;

wherein the plurality of lighting element clusters comprise first, second and third neighboring lighting element clusters that define a triangular region therebetween; and

wherein mounting positions of respective first, second and third different colored solid state lighting devices in the first lighting element cluster are rotationally offset relative to mounting positions of respective first, second and third different colored solid state lighting devices in the second lighting element cluster and respective first, second and third different colored solid state lighting devices in the third lighting element cluster; and

wherein first colored solid state lighting devices in the second and third lighting element clusters are connected in a first series electrical connection to form a first string, second colored solid state lighting devices in the second and third lighting element clusters are connected in a second series electrical connection to form a second string, and third colored solid state lighting devices in the second and third lighting element clusters are connected in a third series electrical connection to form a third string.

21. The solid state lighting tile of claim 20, each of the lighting element clusters include first and second mounting positions, wherein the first mounting position of a lighting element cluster is rotationally offset from the second mounting position of the lighting element cluster relative to a center of the lighting element cluster.

22. The solid state lighting tile of claim 21, wherein each of the lighting element clusters includes a third mounting position configured to receive a solid state light emitting device, and wherein the third mounting position of the lighting element cluster is rotationally offset from the first and second mounting positions relative to the center of the lighting element cluster.

23. The solid state lighting tile of claim 20, wherein the triangular region defined by the first, second and third neighboring lighting element clusters is free of light emitting devices.

24. The solid state lighting tile of claim 20, wherein the first, second and third strings include respective first, second and third anode contacts at a first end of the tile and respective first, second and third cathode contacts at a second end of the tile opposite the first end of the tile.