Common optical element for an array of phosphor converted light emitting devices

• US 8,067,254 B2
• Filed: 01/12/2010
• Issued: 11/29/2011
• Est. Priority Date: 11/12/2004
• Status: Active Grant

• Current Assignee: Lumileds LLC (Apollo Global Management, Inc.)
• Original Assignee: Philips Lumileds Lighting Company LLC (Apollo Global Management, Inc.)
• Inventors: Imler, William R., Tichy, Ladislav, Alferink, Robertus G., Ticha, Helena, Krames, Michael R., Steranka, Frank M., Camras, Michael D., Wall, Franklin J. Jr.
• Primary Examiner(s): Dang; Phuc T
• Application Number:
  US12/686,209
• Publication Number:
  US 20100109568A1
• Time in Patent Office: 686 Days
• Field of Search: 438/22, 438/25, 438/27, 438/29, 438/30, 257/89, 257/98, 257/99, 257/257
• US Class Current: 438/27
• 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 33/58 Optical field-shaping elements
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A device is provided with an array of a plurality of phosphor converted light emitting devices (LEDs) that produce broad spectrum light. The phosphor converted LEDs may produce light with different correlated color temperature (CCT) and are covered with an optical element that assists in mixing the light from the LEDs to produce a desired correlated color temperature. The optical element may be bonded to the phosphor converted light emitting devices. The optical element may be a dome mounted over the phosphor converted light emitting devices and filled with an encapsulant.

Claims

1. A method comprising:

providing a plurality of phosphor converted light emitting devices that produce light with a broad spectrum, the phosphor converted light emitting devices comprising light emitting diode dice, optical elements each mounted on one or more of the light emitting diode dice, and wavelength converting materials comprising phosphor disposed on the light emitting diode dice or the optical elements, the phosphor converted light emitting devices producing light with different correlated color temperatures;

arranging the plurality of phosphor converted light emitting devices in an array; and

covering the array of phosphor converted light emitting devices with an other optical element that assists mixing of the light with different correlated color temperatures to produce light with a desired correlated color temperature.

2. The method of claim 1, wherein the other optical element is bonded to the phosphor converted light emitting devices.

3. The method of claim 1, wherein the other optical element is a dome mounted over the phosphor converted light emitting devices and filled with an encapsulant.

4. The method of claim 1, wherein arranging the plurality of phosphor converted light emitting devices comprises mounting the plurality of phosphor converted light emitting devices to a board.

5. The method of claim 1, the method further comprising:

providing a plurality of color light emitting devices, each of which produces light with a narrow spectrum;

arranging the plurality of color light emitting devices in the array with the plurality of phosphor converted light emitting devices.

6. The method of claim 5, further comprising individually controlling the brightness of the light produced by the plurality of color light emitting devices to vary the correlated color temperature of the resulting spectrum.

7. An apparatus that produces broadband light with a desired correlated color temperature, the apparatus comprising:

an array of a plurality of phosphor converted light emitting devices that produce light with a broad spectrum with different correlated color temperatures, the phosphor converted light emitting devices comprising light emitting diode dice, optical elements each mounted on one or more of the light emitting diode dice, and wavelength converting materials comprising phosphor disposed on the light emitting diode dice or the optical elements; and

an other optical element disposed over the array of the plurality of phosphor converted light emitting devices, the other optical element mixing the light with different correlated color temperatures to produce light with the desired correlated color temperature.

8. The apparatus of claim 7, wherein the other optical element is bonded to the phosphor converted light emitting devices.

9. The apparatus of claim 7, wherein the other optical element is a dome mounted over the phosphor converted light emitting devices and filled with an encapsulant.

10. The apparatus of claim 7, further comprising a board to which the array of the plurality of phosphor converted light emitting devices is mounted.

11. The apparatus of claim 7, wherein the array further comprises a plurality of color light emitting devices.

12. The apparatus of claim 11, the apparatus further comprising a controller for individually controlling the brightness of the light produced by the plurality of color light emitting devices to vary the correlated color temperature to the desired correlated color temperature.