LIGHT SOURCE OF LED AND METHOD FOR PRODUCING LIGHT SOURCE WITH VARYING COLOR WHILE DIMMING

• US 20110248645A1
• Filed: 04/09/2010
• Published: 10/13/2011
• Est. Priority Date: 04/09/2010
• Status: Active Grant

• Current Assignee: Young Lighting Technology Inc. (Coretronic Corporation), Young Lighting Technology Corporation
• Original Assignee: Young Lighting Technology Corporation
• Inventors: Custodis, Udo
• Granted Patent: US 8,330,394 B2
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A light source of LED includes at least one first LED and at least one second LED. The first LED has a first optical illuminant characteristic varying with a variable operation voltage from a first level to a second level, wherein the first level is larger than the second level. The second LED has a second optical illuminant characteristic varying with the variable operation voltage from a third level to a fourth level, wherein the third level is smaller than the fourth level. The first LED and the second LED are simultaneously controlled by the same variable operation voltage to produce a light.

Claims

1. A light source of light-emitting diode (LED), comprising:

at least one first LED, having a first optical illuminant characteristic varying with a variable operation voltage from a first level to a second level, wherein the first level is larger than the second level; and

at least one second LED, having a second optical illuminant characteristic varying with the variable operation voltage from a third level to a fourth level, wherein the third level is smaller than the fourth level,

wherein the first LED and the second LED are simultaneously controlled by the same variable operation voltage to produce a light.

2. The light source of LED in claim 1, wherein the first optical illuminant characteristic adds with the second optical illuminant characteristic to have a smoothly descending curve with the variable operation voltage, a color of the light accordingly changes from white approaching to red when dimming the light.

3. The light source of LED in claim 1, wherein both the first LED and the second LED are white color, and the first LED starts from a warm state in color temperature and the second LED starts from a cool state in color temperature when the variable operation voltage is at full percentage of a reference voltage.

4. The light source of LED in claim 3, wherein the warm state is at color temperature of 2400K and the cool state is at color temperature of 3200K.

5. The light source of LED in claim 1, wherein the first LED is a white LED and the second LED is a color LED warmer than the white LED when the variable operation voltage is at full percentage of a reference voltage.

6. The light source of LED in claim 5, wherein the white LED is at color temperature of 3200K and the color LED is at color temperature of 1000K.

7. The light source of LED in claim 5, wherein the color LED is amber or red.

8. The light source of LED in claim 1, wherein the first LED and the second LED are equal in quantity.

9. The light source of LED in claim 1, wherein the first LED and the second LED are not equal in quantity.

10. The light source of LED in claim 1, further comprising a light integrating plate to receive the light from the first LED and the second LED at a side incident surface.

11. The light source of LED in claim 1, further comprising a light integrating envelope, covering the first LED and the second LED to receive the light.

12. The light source of LED in claim 1, wherein the first optical illuminant characteristic is smoothly descending from the first level to the second level and the second optical illuminant characteristic is smoothly increasing from the third level to the fourth level.

13. The light source of LED in claim 1, wherein the first optical illuminant characteristic is smoothly descending from the first level to the second level and the second optical illuminant characteristic is smoothly increasing and then descending from the third level to the fourth level.

14. A method for producing a light using light-emitting diode (LED), comprising:

providing at least one first LED, the first LED having a first optical illuminant characteristic varying with a variable operation voltage from a first level to a second level, wherein the first level is larger than the second level;

providing at least one second LED, the second LED having a second optical illuminant characteristic varying with the variable operation voltage from a third level to a fourth level, wherein the third level is smaller than the fourth level; and

simultaneously applying the variable operation voltage to the first LED and the second LED to produce the light.

15. The method of claim 14, further comprising a light integrating device to integrate and mix each of individual lights of the first LED and the second LED.

16. The method of claim 14, wherein the first optical illuminant characteristic adds with the second optical illuminant characteristic to have a smoothly descending curve with the variable operation voltage, a color of the light accordingly changes from white to red when dimming the light.

17. The method in claim 14, wherein both the first LED and the second LED are provided with white color, and the first LED starts from a warm state in color temperature and the second LED starts from a cool state in color temperature when the variable operation voltage is at full percentage of a reference voltage.

18. The method claim 17, wherein the warm state is set at color temperature of 2400K and the cool state is set at color temperature of 3200K.

19. The method of claim 14, wherein the first LED is provided for emitting a white light and the second LED is provided for emitting a color light warmer than the white light when the variable operation voltage is at full percentage of a reference voltage.

20. The method in claim 19, wherein the color light of the second LED is amber or red.