Wavelength converting system

• US 8,210,699 B2
• Filed: 08/01/2011
• Issued: 07/03/2012
• Est. Priority Date: 07/18/2007
• Status: Active Grant

• Current Assignee: Epistar Corporation
• Original Assignee: Epistar Corporation
• Inventors: Wang, Chien-Yuan, Hsieh, Min-Hsun, Lu, Chih-Chiang
• Primary Examiner(s): BRUCE, DAVID VERNON
• Application Number:
  US13/195,620
• Publication Number:
  US 20110286201A1
• Time in Patent Office: 337 Days
• Field of Search: 362/84, 362/231, 362/235, 362/260
• US Class Current: 362/84
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 1/17 the material comprising photoluminescent substances
• CPC Class Codes: F21V 3/08 the material comprising photoluminescent substances
• CPC Class Codes: F21V 5/10 comprising photoluminescent material
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: G02F 1/353 Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
• 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

Abstract

An embodiment of the invention discloses a wavelength converting system. The wavelength converting system comprises: a wavelength converter having a first area and a second area; a first light source disposed under the first area and inducing a first mixed light being visible above the first area; a second light source disposed under the second area and inducing a second mixed light being visible above the second area; and a carrier supporting the first light source and the second light source. The first light source and the second light source have a dominant wavelength difference of 1 nm˜20 nm, and the first mixed light and the second mixed light have a color temperature difference less than 100K.

Claims

1. A wavelength converting system, comprising:

a wavelength converter having a first area and a second area, and capable of generating at least two peak wavelengths in one color;

a first light source disposed under the first area and inducing a first mixed light being visible above the first area; and

a second light source disposed under the second area and inducing a second mixed light being visible above the second area; and

wherein the first light source and the second light source have a dominant wavelength difference of 1 nm˜

20 nm.

2. The wavelength converting system of claim 1, further comprising a light-pervious optical element covering the first light source and the second light source, and being covered by, coupled to, or mixed with the wavelength converter.

3. The wavelength converting system of claim 2, wherein the light-pervious optical element is selected from the group consisting of a lampshade, a tube, a lens, a cover, a sticker, a plate, and a film.

4. The wavelength converting system of claim 1, wherein the wavelength converter is separated from the first light source and the second light source.

5. The wavelength converting system of claim 1, wherein the wavelength converter is configured to directly contact with the first light source and the second light source.

6. The wavelength converting system of claim 1, wherein the wavelength converter comprises a fluorescent mixture showing a positive correlation between an excitation wavelength and an emission wavelength.

7. The wavelength converting system of claim 1, further comprising a carrier on which the first light source and the second light source are flip-chip mounted.

8. The wavelength converting system of claim 1, wherein each of the first light source and the second light source comprises a light-pervious substrate or a light-pervious optical element.

9. The wavelength converting system of claim 8, wherein the wavelength converter is disposed on the light-pervious substrate or the light-pervious optical element.

10. The wavelength converting system of claim 1, wherein the wavelength converter is capable of generating at least two peak wavelengths in yellow color.

11. The wavelength converting system of claim 1, wherein the first mixed light and the second mixed light have a color temperature difference less than 100K.

12. The wavelength converting system of claim 1, wherein the wavelength converter comprises at least two phosphors.

13. The wavelength converting system of claim 1, wherein the wavelength converter comprises a YAG phosphor.

14. The wavelength converting system of claim 1, wherein the wavelength converter comprises a silicate-based phosphor.

15. The wavelength converting system of claim 1, when being driven, the first light source and the second light source have different current densities.

16. The wavelength converting system of claim 1, further comprising a trench between the first light source and the second light source.

17. The wavelength converting system of claim 1, wherein the first light source has a dominant wavelength of 420 nm˜

480 nm.

18. The wavelength converting system of claim 1, wherein the second light source has a dominant wavelength of 420 nm˜

480 nm.

19. The wavelength converting system of claim 1, wherein the first light source or the second light source can emit a blue light.

20. The wavelength converting system of claim 1, wherein the first mixed light or the second mixed light is a white light.