High efficacy lighting signal converter and associated methods

• US 8,866,839 B2
• Filed: 07/31/2013
• Issued: 10/21/2014
• Est. Priority Date: 05/15/2011
• Status: Expired due to Fees

• Current Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Maxik, Fredric S., Soler, Robert R., Bartine, David E., Zhou, Ran, Bastien, Valerie A., Regan, Matthew, Grove, Eliza Katar, Bretschneider, Eric
• Primary Examiner(s): Sajous, Wesner
• Application Number:
  US13/955,891
• Publication Number:
  US 20130313997A1
• Time in Patent Office: 447 Days
• Field of Search: 345/36, 345/39, 345/44, 345/46, 345/48, 345 76- 77, 345/84, 345/204, 345/207, 345426-428, 345/581, 345589-591, 345600-601, 345/604, 345/606, 345/690, 348/68, 348 70- 71, 348253-254, 348268-271, 348277-279, 348/552, 348/557, 348/560, 348/602, 348/612, 348/630, 348/687, 348/750, 348801-803, 358509-510, 358/512, 358518-519, 358/523, 382/162, 382/167, 382/254, 382/274, 382/276
• US Class Current: 345/590
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A signal adapting chromacity system to control that may include a signal conversion engine to receive a source signal designating a color of light defined by a two spatial plus luminance dimensional color space, such as the xxY color space. The signal conversion engine may convert the source signal to a three dimensional color space defined within a subset gamut of a full color gamut, such as an RGW, RBW, or GBW color space. The subset gamut may include a first color light, a second color light and a high efficacy light. The signal conversion engine may perform a conversion operation to convert the source signal to an output signal, using the output signal to drive light emitting diodes (LEDs). The conversion operation may be a matrix, angular or linear conversion operation.

Claims

1. A signal adapting chromaticity system to control a lighting device comprising:

a signal conversion engine that receives a source signal designating a color of light defined by a two spatial plus luminance dimensional color space and converts the source signal to a three dimensional color space defined within a subset gamut of a full color gamut;

wherein the signal conversion engine performs an angular conversion operation to convert the source signal to an output signal, and uses the output signal to drive light emitting diodes (LEDs); and

wherein the three dimensional color space defined by the subset gamut is divided from the full color gamut using angular determination to include;

an origin including the high efficacy light,

primaries including colored light, the primaries defined in the subset gamut including a first subset primary relative to the first color light and a second subset primary relative to the second color light, and

a subset gamut angular range included between a first primary angle relative to the first subset primary and a second primary angle relative to the second subset primary;

wherein the subset gamut includes a first color light, a second color light and a high efficacy light.

2. A system according to claim 1 wherein the first color light and the second color light are emitted by colored LEDs, and wherein the high efficacy light is emitted by a high efficacy LED.

3. A system according to claim 2 further including a conversion coating applied to the colored LEDs to convert a source light wavelength range into a converted light wavelength range.

4. A system according to claim 1 wherein the two spatial plus luminance dimensional color space is a xyY color space, the three dimensional color space defined within the full color gamut is a RGBW color space, and the three dimensional color space defined within the subset gamut is selected from a group comprising a RGW color space, GBW color space, or RBW color space.

5. A system according to claim 1 wherein the first color light and the second color light are selected from a group comprising a red light, a blue light, and a green light, and wherein the high efficacy light is a white light.

6. A system according to claim 1 wherein the three dimensional color space included in the subset gamut is triangularly located between the origin, the first subset primary, and the second subset primary;

wherein the color of the light defined by the two spatial plus luminance dimensional color space is plotted in the three dimensional color space of the full color gamut; and

wherein a color angle is located within the three dimensional color space defined by the subset gamut relative to the color of the light, the color angle being located between the first primary angle and the second primary angle.

7. A system according to claim 6 wherein a first primary angular range is included between the first primary angle and the color angle, and wherein a second primary angular range is included between the second primary angle and the color angle;

wherein the first primary angular range is compared to the second primary angular range to determine a first primary angular ratio proportional to a first portion of the subset gamut angular range comprised of the first primary angular range, and the first primary angular ratio determining a luminosity of the first subset primary included in the output signal;

wherein the second primary angular range is compared to the first primary angular range to determine a second primary angular ratio proportional to a second portion of the subset gamut angular range comprised of the second primary angular range, and the second primary angular ratio determining the luminosity of the second subset primary included in the output signal; and

wherein the luminosity of the first subset primary and second subset primary are analyzed to determine the luminosity of the high efficacy light included in the output signal.

8. A method for controlling a lighting device wherein the lighting device includes a signal conversion engine that receives a source signal designating a color of light defined by a two spatial plus luminance dimensional color space and converts the source signal to a three dimensional color space defined within a subset gamut of a full color gamut, the method comprising:

using primaries to create matrices that include a high efficacy origin;

calculating X, Y, and Z values from the source signal;

calculating a determinate of matrices;

calculating a matrix of minors using the determinate;

utilizing the matrix of minors to calculate a matrix of cofactors;

utilizing the matrix of cofactors to calculate an adjunct of the matrix;

determining an inverse matrix from the adjunct of the matrix;

calculating a scalar from the inverse matrix;

analyzing values of the first subset gamut defined as the analyzing step;

reporting an output signal if all values of the first subset gamut are positive and repeating the analyzing step for a next subset gamut if all values of the first gamut are not positive.

9. A method according to claim 8 wherein the subset gamut includes a first color light, a second color light and a high efficacy light.

10. A method according to claim 9 wherein the first color light and the second color light are emitted by colored LEDs, and wherein the high efficacy light is emitted by a high efficacy LED.

11. The method according to claim 9 wherein the two spatial plus luminance dimensional color space is a xyY color space, the three dimensional color space defined within the full color gamut is a RGBW color space, and the three dimensional color space defined within the subset gamut is selected from a group comprising a RGW color space, GBW color space, or RBW color space.

12. The method according to claim 9 wherein the first color light and the second color light are selected from a group comprising a red light, a blue light, and a green light, and wherein the high efficacy light is a white light.

13. The method according to claim 10 wherein a conversion coating is applied to the colored LEDs to convert a source light wavelength range into a converted light wavelength range.

14. A signal adapting chromaticity system to control a lighting device comprising:

a signal conversion engine that receives a source signal designating a color of light defined by a two spatial plus luminance dimensional color space and converts the source signal to a three dimensional color space defined within a subset gamut of a full color gamut;

wherein the signal conversion engine performs a linear conversion operation to convert the source signal to an output signal, and uses the output signal to drive light emitting diodes (LEDs);

wherein the three dimensional color space defined by the subset gamut is divided from the full color gamut to include;

an origin that includes the high efficacy light,

primaries that included colored light, the primaries defined in the subset gamuts including a first subset primary relative to the first color light and a second subset primary relative to the second color light, and

a color point defined by plotting the color of the light as defined within the two spatial plus luminance dimensional color space in the three dimensional color space of the full color gamut;

wherein lines are defined relative to the two spatial plus luminance dimensional color space; and

wherein the subset gamut includes a first color light, a second color light and a high efficacy light.

15. The system according to claim 14 wherein the lines include

a first primary line defined between the origin and the first subset primary,

a second primary line defined between the origin and the second subset primary,

a color line defined between origin and the color point including a slope and an axial intercept, and

a subset gamut line that intersects the first primary line, the second primary line, and the color point.

16. The system according to claim 15 wherein the axial intercept is located at the origin;

wherein the subset gamut line intersects the first primary line at a first primary intersection distance from the origin, wherein the subset gamut line intersects the second primary line at a second primary intersection distance from the origin, and wherein the first primary intersection distance and the second primary intersection distance are substantially equal;

wherein a subset gamut linear range is defined along the subset gamut line between the first primary line and the second primary line, the subset gamut linear range including a first primary linear range and a second primary linear range;

wherein the first primary linear range is compared to the second primary linear range to determine a first primary linear ratio proportional to a first portion of the subset gamut linear range comprised of the first primary linear range, and the first primary linear ratio determining a luminosity of the first subset primary included in the output signal;

wherein the second primary linear range is compared to the first primary linear range to determine a second primary linear ratio proportional to a second portion of the subset gamut linear range comprised of the second primary linear range, and the second primary linear ratio determining the luminosity of the second subset primary included in the output signal; and

wherein the luminosity of the first subset primary and the second subset primary are analyzed to determine the desired luminosity of the high efficacy light included in the output signal.

17. A system according to claim 14 wherein the first color light and the second color light are emitted by colored LEDs, and wherein the high efficacy light is emitted by a high efficacy LED.

18. A system according to claim 17 further including a conversion coating applied to the colored LEDs to convert a source light wavelength range into a converted light wavelength range.

19. A system according to claim 14 wherein the two spatial plus luminance dimensional color space is a xyY color space, the three dimensional color space defined within the full color gamut is a RGBW color space, and the three dimensional color space defined within the subset gamut is selected from a group comprising a RGW color space, GBW color space, or RBW color space.