Color temperature adjusting method of solid state light emitting device and solid state light emitting device using the method

• US 9,320,109 B2
• Filed: 11/14/2012
• Issued: 04/19/2016
• Est. Priority Date: 12/28/2011
• Status: Expired due to Fees

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Lai, Chih-Chen
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): King, Monica C
• Application Number:
  US13/677,210
• Publication Number:
  US 20130169187A1
• Time in Patent Office: 1,252 Days
• US Class Current: 1/1
• 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 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, 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, 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.

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

3. The method of claim 1, 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.

4. 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;

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

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, 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, 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.

5. The method of claim 4, wherein the mixed emitting light has a chromaticity coordinate deviating from the Planck'"'"'s curve on the CIE 1931 chromaticity coordinates chart.

6. The method of claim 4, 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.