LED assembly with color temperature correction capability

• US 8,624,272 B2
• Filed: 08/15/2011
• Issued: 01/07/2014
• Est. Priority Date: 04/24/2008
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Takashima, Jun, Norio, Kanai
• Primary Examiner(s): Stark, Jarrett
• Assistant Examiner(s): TYNES JR., LAWRENCE C
• Application Number:
  US13/210,147
• Publication Number:
  US 20110297974A1
• Time in Patent Office: 876 Days
• Field of Search: 257/88, 313/503, 313/498, 313/512, 313/509, 428/690, 349/69, 362/84
• US Class Current: 257/88
• 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 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/52 Encapsulations
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

An illumination assembly is provided which is capable of correcting a color temperature. The assembly includes a substrate with a plurality of coatings applied on a respective plurality of surface portions of a base material. A light emitting device includes one or more light emitting elements of a first color temperature mounted on surface portions of the substrate having a first color coating, and one or more light emitting elements having a second color temperature mounted on surface portions of the substrate having a second color coating. Light emitting elements are individually sealed with a resin containing an excitable phosphor, with a reflectance factor of the first color coating and a reflectance factor of the second color coating set corresponding to light emitted from the light emitting elements having the first and second color temperatures, respectively, with respect to a desired color temperature for the light emitting device.

Claims

1. An illumination assembly, comprising:

a substrate comprising a base material and a plurality of coatings applied on a respective plurality of surface portions of the base material,

one or more of the coatings comprising a first color having a first reflectance factor, and

one or more of the coatings comprising a second color having a second reflectance factor;

a light emitting device mounted on the substrate, the light emitting device further comprising

one or more light emitting elements having a first color temperature and mounted on surface portions of the substrate having the first color coating, wherein light emitted from the light emitting elements having said first color temperature and as reflected from the first color coating corresponds with a desired color temperature for the light emitting device,

one or more light emitting elements having a second color temperature and mounted on surface portions of the substrate having the second color coating, wherein light emitted from the light emitting elements having said second color temperature and as reflected from the second color coating also corresponds with the desired color temperature for the light emitting device, and

one or more of said light emitting elements further individually sealed with a resin containing a phosphor excitable by light emitted from the associated light emitting element.

2. The illumination assembly of claim 1, further comprising a translucent resin applied on the light emitting device and the substrate, the translucent resin having a refractive index and correspondingly effective to suppress variations in color temperature.

3. The illumination assembly of claim 2, further comprising a transparent case encompassing the light emitting device, the substrate and the translucent resin applied on the light emitting device and the substrate.

4. The illumination assembly of claim 3, wherein the inside of the case is completely filled with the translucent resin applied on the light emitting device and the substrate.

5. An illumination assembly, comprising:

a substrate comprising a base material, the base material including a first surface portion having a first color coating with a first reflectance factor, and a second surface portion having a second color coating with a second reflectance factor;

a first light emitting device mounted on the first surface portion of the substrate having the first color coating, the first light emitting device comprising one or more light emitting elements having a first color temperature, wherein the first color coating is effective to reflect or absorb light emitted from the light emitting elements of the first light emitting device in accordance with a desired color temperature for the illumination assembly;

a second light emitting device mounted on the second surface portion of the substrate having the second color coating, the second light emitting device comprising one or more light emitting elements having a second color temperature, wherein the second color coating is effective to reflect or absorb light emitted from the light emitting elements of the second light emitting device in accordance with said desired color temperature;

one or more of said light emitting devices further having the associated light emitting elements sealed by a resin containing a phosphor.

6. The illumination assembly of claim 5, further comprising a translucent resin applied on the light emitting devices and the substrate, the translucent resin having a refractive index and correspondingly effective to suppress variations in color temperature.

7. The illumination assembly of claim 6, further comprising a transparent case encompassing the light emitting devices, the substrate and the translucent resin applied on the light emitting devices and the substrate.

8. The illumination assembly of claim 7, wherein the inside of the case is completely filled with the translucent resin applied on the light emitting devices and the substrate.