LED ASSEMBLY WITH COLOR TEMPERATURE CORRECTION CAPABILITY

• US 20100001297A1
• Filed: 04/24/2009
• Published: 01/07/2010
• Est. Priority Date: 04/24/2008
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Takashima, Jun, Kanai, Norio
• Application Number:
  US12/429,787
• Publication Number:
  US 20100001297A1
• Time in Patent Office: Days
• 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 generally comprises a substrate and a light emitting device mounted on the substrate that further comprises a light emitting element and a resin containing a phosphor excitable by light emitted from the light emitting element. A reflectance factor of the substrate may be set corresponding to light emitted from the light emitting device, such that the light emitted by the light emitting device complies with a desired light emission for the illumination assembly. A translucent filling resin or translucent coating resin may further be applied on the light emitting device and the substrate, the translucent resin having a refractive index and correspondingly operable to suppress variations in color temperature. The assembly may comprise a plurality of light emitting devices having variable light color temperatures, wherein a plurality of substrate coatings may be provided having reflectance factors corresponding to the associated light color temperatures. One or more translucent resins may be applied on light emitting devices as desired to further suppress variations in color temperature.

Claims

1. An illumination assembly, comprising:

a substrate;

a light emitting device mounted on the substrate, the light emitting device further comprising a light emitting element, and a resin containing a phosphor excitable by light emitted from the light emitting element; and

a reflectance factor of the substrate set corresponding to light emitted from the light emitting device.

2. The illumination assembly of claim 1, wherein the substrate further comprises:

a base material; and

a coating having color absorbing a particular spectrum of light emitted from the light emitting device,

wherein variations of a color temperature are suppressed.

3. The illumination assembly of claim 2, wherein the light emitting element further comprises an LED chip emitting blue light with a wavelength of approximately 380 to 480 nm, and a phosphor emitting light with a wavelength of approximately 480 to 780 nm by being excited by the blue light;

and

wherein the color of the substrate coating is operable to absorb the blue light.

4. 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.

5. The illumination assembly of claim 4, 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.

6. The illumination assembly of claim 5, wherein the inside of the case is completely filled with the translucent resin applied on the light emitting device and the substrate.

7. The illumination assembly of claim 4, the translucent resin applied on the light emitting device and the substrate further comprises a pigment absorbing light with a specified wavelength region.

8. The illumination assembly of claim 4, wherein the transparent resin applied on the light emitting device and the substrate further comprises a phosphor exciting light with a specified wavelength region.

9. The illumination assembly of claim 4, wherein the translucent resin applied on the light emitting device and the substrate further comprises both of a pigment absorbing light with a specified wavelength region and a phosphor exciting light with a specified wavelength region, wherein a mixing ratio between the amounts of pigment and phosphor may be adjusted to produce a desired refractive index for the translucent resin.

10. An illuminating assembly the assembly comprising:

a plurality of light emitting devices, each light emitting device further comprising a light emitting element, and a resin containing a phosphor excitable by light emitted from the light emitting element;

a substrate on which the plurality of light emitting devices are mounted, the substrate further comprising a base material, and a plurality of coatings, each coating associated with one of the plurality of light emitting elements; and

a color temperature of each substrate coating set corresponding to light emitted from the associated light emitting device.

11. The assembly of claim 10, the plurality of light emitting elements further comprising a plurality of blue LED chips functional to emit light having a wavelength of approximately 380 to 480 nm, each blue LED chip further sealed with the resin containing a phosphor excitable by the light emitted from the associated blue LED chip.

12. The assembly of claim 11, the plurality of coatings further comprising yellow ink coatings of variable color temperatures, wherein setting higher substrate coating color temperatures corresponds with increasing absorption of blue light emitted from the associated light emitting devices.

13. The assembly of claim 11, further comprising:

a transparent case containing the plurality of light emitting devices and the substrate, and

a plurality of translucent resins filling the inner space of the case, a translucent resin associated with each of the plurality of light emitting devices,

each translucent resin having a refractive index set corresponding to light emitted from the associated light emitting device.

14. The assembly of claim 13, wherein setting lower refractive indices corresponds with increasing absorption of blue light emitted from the associated light emitting devices.

15. An illuminating assembly for suppressing variation of color temperatures in the assembly, the assembly comprising:

a plurality of light emitting devices, each light emitting device further comprising a light emitting element, and a resin further comprising phosphor excitable by light emitted from the light emitting element, a compounding ratio of the phosphor corresponding to a color temperature of the light emitted by the light emitting element;

a substrate on which the plurality of light emitting devices are mounted, the substrate further comprising a plurality of coatings associated with the plurality of light emitting elements mounted thereon; and

one or more translucent coating resins applied to one or more light emitting devices, a refractive index for each translucent coating resin set corresponding to the light emitted from the corresponding light emitting device.

16. The assembly of claim 15, wherein one or more light emitting devices are not coated with a translucent coating resin.

17. The assembly of claim 15, further comprising a color temperature of each substrate coating set corresponding to light emitted from the associated light emitting device.

18. The assembly of claim 17, wherein the one or more translucent coating resins may be applied after setting a color temperature for each substrate coating, wherein variation of color temperatures of light emitted by the plurality of light emitting devices is suppressed.

19. The assembly of claim 15, wherein a color temperature of the light emitted from each of the plurality of light emitting devices is set to be lower than the color temperature required for the illumination device.

20. The assembly of claim 19, wherein each light emitting device further comprises a resin further comprising phosphor excitable by light emitted from the light emitting element,

wherein a compounding ratio of the phosphor corresponds to a color temperature of the light emitted by the light emitting element, the compounding ratio adjustable to set the color temperature of the light emitted from each of the plurality of light emitting devices to be lower than the color temperature required for the illumination device.