WAVELENGTH CONVERTING SYSTEM

• US 20110050126A1
• Filed: 11/08/2010
• Published: 03/03/2011
• Est. Priority Date: 07/18/2007
• Status: Active Grant

• Current Assignee: Chien-Yuan Wang, Chih-Chiang Lu, Min-Hsun Hsieh
• Original Assignee: Chien-Yuan Wang, Chih-Chiang Lu, Min-Hsun Hsieh
• Inventors: Lu, Chih-Chiang, Hsieh, Min-Hsun, Wang, Chien-Yuan
• Granted Patent: US 7,988,325 B2
• Time in Patent Office: Days
• US Class Current: 315/294
• 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;

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;

wherein 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.

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, wherein the first light source and the second light source are flip-chip mounted on the carrier.

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 comprises two phosphors substantially having the same principle emission spectrum.

11. A wavelength converting system, comprising:

a first light-emitting diode chip, driven on a first current, having a first area and a first dominant wavelength;

a second light-emitting diode chip, driven on a second current, having a second area and a second dominant wavelength different from the first dominant wavelength;

a wavelength converter disposed on the first light-emitting diode chip and the second light-emitting diode chip; and

a mixed light, induced by the first light-emitting diode chip and the second light-emitting diode chip, being visible above the wavelength converter;

wherein the first current and the second current are configured to oppositely change in a range, and the mixed light has a color temperature variation less than 100K within the range.

12. The wavelength converting system of claim 11, wherein the first area is substantially equal to the second area.

13. The wavelength converting system of claim 11, wherein the range is between 0 mA˜

20 mA.

14. The wavelength converting system of claim 11, further comprising a package for accommodating the first light-emitting diode chip and the second light-emitting diode chip.

15. The wavelength converting system of claim 11, wherein a ratio of the first current to the first area is different from a ratio of the second current to the second area.

16. The wavelength converting system of claim 11, wherein the wavelength converter comprises a YAG phosphor.

17. The wavelength converting system of claim 11, wherein the wavelength converter comprises a silicate-based phosphor.

18. A wavelength converting system, comprising:

a plurality of light-emitting structures having a dominant wavelength distribution spanned in few nanometers or tens of nanometers;

a trench formed between two of the plurality of the light-emitting structures; and

a wavelength converter disposed on the plurality of light-emitting structures and the trench.

19. The wavelength converting system of claim 18, wherein the dominant wavelength distribution comprises a Gaussian distribution or a non-normal distribution.

20. The wavelength converting system of claim 18, wherein the dominant wavelength distribution comprises a range of 420 nm˜

480 nm.