COLOR TEMPERATURE ADJUSTING METHOD OF SOLID STATE LIGHT EMITTING DEVICE AND SOLID STATE LIGHT EMITTING DEVICE USING THE METHOD

• US 20130169187A1
• Filed: 11/14/2012
• Published: 07/04/2013
• Est. Priority Date: 12/28/2011
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: LAI, CHIH-CHEN
• Granted Patent: US 9,320,109 B2
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21S 10/023 by selectively switching fixed light sources
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/15 Organic light-emitting diodes [OLED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 47/10 Controlling the light source

Abstract

A color temperature adjusting method of solid state light emitting device, including steps: providing a main light source which emits main light of a first color temperature; providing an adjusting light source, wherein the adjusting light source comprises a red light source, a green light source and a blue light source; and adjusting currents applied to the adjusting light sources to obtain an adjusting light, wherein the adjusting light mixes with the main light of the main light source to obtain an outgoing light of a second color temperature. The second color temperature is different from the first color temperature. The outgoing light has a chromaticity coordinate at a Plank'"'"'s curve on a CIE 1931 chromaticity coordinates chart.

Claims

1. A color temperature adjusting method of solid state light emitting device, comprising:

providing a main light source which emits main light of a first color temperature;

providing an adjusting light source, wherein the adjusting light source comprises a plurality of red light sources, a plurality of green light sources and a plurality of blue light sources which alternately surround the main light source; and

adjusting currents applied to each of the red, green and blue light sources of the adjusting light source to obtain an adjusting light, the adjusting light mixing with the main light of the main light source to obtain an outgoing light of a second color temperature;

wherein the second color temperature is different from the first color temperature and wherein a chromaticity coordinate of the outgoing light is at a Plank'"'"'s curve on a CIE 1931 chromaticity coordinates chart.

2. The method of claim 1, wherein the main light of the main light source has a chromaticity coordinate deviating from the Planck'"'"'s curve on the CIE 1931 chromaticity coordinates chart.

3. The method of claim 2, wherein the main light produced by the main light source has a chromaticity coordinate (0.41, 0.43) on the CIE 1931 chromaticity coordinates chart.

4. The method of claim 3, wherein the outgoing light has a chromaticity coordinate falling on the Planck'"'"'s curve at 6500K point.

5. A color temperature adjusting method of solid state light emitting device comprising:

providing a main light sources consisting of at least two sub-main light sources emitting lights of different color temperatures;

adjusting currents applied to the at least two sub-main light sources to obtain a mixed emitting light; and

providing an adjusting light source comprising a red light source, a green light source and a blue light source;

adjusting current each of the red light source, the green light source and the blue light source to obtain a mixed adjusting light, the adjusting light mixing with the mixed emitting light to obtain an outgoing light;

wherein the outgoing light has a color temperature different from a color temperature of the mixed emitting light and wherein a chromaticity coordinate of the outgoing light is at a Plank'"'"'s curve on a CIE 1931 chromaticity coordinates chart.

6. The method of claim 5, wherein the mixed emitting light has a chromaticity coordinate deviating from the Planck'"'"'s curve on the CIE 1931 chromaticity coordinates chart.

7. The method of claim 5, wherein the main light source consists of four sub-main light sources, the four sub-main light sources emitting lights having different color temperatures, currents applied to the four sub-main light sources being I₁, I₂, I₃ and I₄, respectively.

8. The method of claim 7, wherein the color temperatures of the lights of the four sub-main light sources are 3500K, 4500K, 5500K and 15000K, respectively, and a ratio of I₁, I₂, I₃ and I₄ is 1:

1;

0.25;

0, and the outgoing light has a color temperature of 2800K.

9. The method of claim 7, wherein the color temperatures of the lights of the four sub-main light sources are 3500K, 4500K, 5500K and 15000K, respectively, and a ratio of I₁, I₂, I₃ and I₄ is 1:

1;

1;

0.365, and the outgoing light has a color temperature of 3500K.

10. The method of claim 5, wherein the main light source comprises four sub-main light sources arranged in a square array, and the red light source, the green light source and the blue light source each includes four light emitting diodes surrounding the main light source.

11. An illuminating device, comprising:

a main light source; and

a plurality of red light sources;

a plurality of blue light sources; and

a plurality of green light sources;

wherein the main light source is set in a middle of the illuminating device, and the red, blue and green light sources alternately surround the main light source; and

wherein current applied to each the red, blue and green light sources is changeable to change color temperature of light from the main light source by mixing light of the red, blue, green light sources with the light from the main light source, the light from the main light source and the light from the red, blue and green light sources being mixed together to obtain an outgoing light of the illuminating device which has a chromaticity coordinate located at a Plank'"'"'s curve on a CIE 1931 chromaticity coordinates chart.

12. The illuminating device of claim 11, wherein the main source comprises at least two sub-main light sources, and color temperatures of the at least two sub-main light sources are different from each other.

13. The illuminating device of claim 12, wherein color temperature of mixed light of lights from the at least two sub-main light sources is changeable by changing currents applied to the at least two sub-main light sources.

14. The illuminating device of claim 11, the main light source, the blue light sources, the red light sources and the green light sources are arranged in a same plane.

15. The illuminating device of claim 14, the red light sources, the blue light sources and the green light sources are arranged alternately around the main light source.