Light System with Improved Color Control

• US 20160323961A1
• Filed: 04/26/2016
• Published: 11/03/2016
• Est. Priority Date: 04/29/2015
• Status: Active Grant

• Current Assignee: Harman Professional Denmark ApS. (Samsung Electronics Co. Ltd.)
• Original Assignee: Martin Professional ApS (Samsung Electronics Co. Ltd.)
• Inventors: JENSEN, Frank Kjaer
• Granted Patent: US 10,187,949 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• 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 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2113/17 forming a single encapsulated light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The invention relates to a light system, which comprises a plurality of light source modules arranged in at least a row in a system housing having an outer boundary, and diffuser to which the light from the plurality of light source modules is emitted. Each light source module comprises at least one light source emitting light of a predefined color. Furthermore, the plurality of light source modules comprise at least one first light source module which is located closer to the outer boundary of the system housing than second light source modules of the plurality of light source modules which are located further away from the outer boundary than the at least one first light source module. The system furthermore comprises a color control unit configured to control, for each of the light source modules of the light system, the at least one light source individually using a light source control signal. The color control unit is configured such that, when a desired color is to be generated at the diffuser, it selects a first light source control signal for the at least one light source of the at least one first light source module that is different from a second light source control signal selected for the at least one light source of the second light source modules.

Claims

1. A light system comprising:

a plurality of light source modules arranged in at least a row in a system housing having an outer boundary and a diffuser to which the light from the plurality of light source modules is emitted, wherein each light source module comprises at least one light source emitting light of a predefined color, wherein the plurality of light source modules comprises at least one first light source module that is located closer to the outer boundary of the system housing than second light source modules of the plurality of light source modules that are located farther away from the outer boundary than the at least one first light source module,

a color control unit configured to control, for each of the light source modules included in the plurality of light source modules, the at least one light source individually using a light source control signal,

wherein the color control unit is configured such that, when a desired uniform color is to be generated at the diffuser based on the at least one first light source module and based on at least one of the second light source modules, the color control unit selects a first light source control signal for the at least one light source of the at least one first light source module that is different from a second light source control signal selected for the at least one light source of the at least one second light source module.

2. The light system according to claim 1, wherein the plurality of light source modules are arranged relative one another such that the light from neighboring light source modules at least partially overlaps at a light mixing area present between the light source modules and the diffuser, wherein the light emitted by one of the second light source modules overlaps in the light mixing area with light of at least N other light source modules, whereas light emitted by the at least one first light source module overlaps in the light mixing area with light from M other light source modules, with M being smaller than N, wherein the color control unit is configured to control the at least one light source of the at least one of the first light source module and of the at least one second light source module in such a way that at least one of the light sources of the at least one first light source module and of the at least one second light source module compensates for a color difference generated based on M being smaller than N.

3. The light system according to claim 1, wherein the at least one first light source module includes a light source module included in the plurality of light source modules that is located nearest to the outer boundary in direction of the row.

4. The light system according to claim 1, wherein each light source module included in the plurality of light source modules comprises at least two light sources emitting light of different colors.

5. The light system according to claim 4, wherein the light sources of the plurality of light source modules are arranged linearly in direction of the row, wherein one of the second light source modules located proximate to the at least one first light source module comprises, in the direction of the outer boundary, a dominating light source that is located farther away from the outer boundary than at least one other light source of the at least one second light source module that emits a dominant color to a section of a light mixing area located above the at least one first light source module, wherein the color control unit is configured to control at least one of the light sources of the at least one first light source module and of the at least one second light source module such that that the influence of the dominant color in the section of the light mixing area located above the at least one first light source module is cancelled out.

6. The light system according to claim 5, wherein the at least one first light source module also comprises the dominant light source, wherein the color control unit is configured to control the light sources of the at least one first light source module such that the control unit decreases the light intensity of the dominant light source at the at least one first light source module relative to the light intensity of the at least one of the light sources of the at least one first light source module.

7. The light system according to claim 5, wherein the at least one first light source module also comprises the dominant light source, wherein the color control unit controls the light sources of the at least one first light source module such that the control unit increases the light intensity of the at least one of the other light sources of the at least one first light source module relative to the light intensity of the dominant light source.

8. The light system according to claim 2, wherein the color control unit is configured to operate in a calibrating mode in which the light control signal for the at least one first light source module is adapted until a color emitted by a section of the diffuser that is illuminated by the at least one first light source module corresponds to the desired color, wherein the color control unit is configured to store a calibration value for at least one light source of the at least one first light source module when the adaptation is terminated.

9. The light system according to claim 4, wherein the at least one first light source module and the at least one second light source module include the same light sources, wherein the color control unit is configured to generate the first light source control signal that contains first intensity values for the light sources of the at least one first light source module that are different from second intensity values for the light sources of the at least one second light source module when the color emitted at the diffuser corresponds to the desired color.

10. The light system according to claim 1, wherein the plurality of light source modules are arranged in a matrix shape in rows and columns in the system housing, and wherein the at least one first light source module comprises at least the light source module in the matrix that is located closest to the system housing.

11. A light system comprising:

a plurality of light source modules arranged in at least a row in a system housing having an outer boundary; and

a diffuser to which the light from the plurality of light source modules is emitted,

wherein each light source module included in the plurality of light source modules comprises at least one light source emitting light of a predefined color, wherein the plurality of light source modules comprises at least one first light source module that is located closer to the outer boundary of the system housing than second light source modules included in the plurality of light source modules that are located farther away from the outer boundary than the at least one first light source module, and

wherein the color emitted by the light system is controlled via a light source control signal for each of the light source modules, wherein, for each of the light source modules included in the plurality of light source modules, the at least one light source is controlled individually using the light source control signal, wherein, when a desired uniform color is to be generated at the diffuser based on the at least one first light source module and based on at least one of the second light source module, the first light source control signal is selected for the light sources of the first light source module that is different from the second light source control signal selected for the at least one light source of the at least one second light source module.

12. The system according to claim 11, wherein each light source module included in the plurality of light source modules comprises at least two light sources emitting light of different colors, wherein the light sources of the plurality of light source modules are arranged linearly in direction of the row, wherein one of the second light source modules located proximate to the at least one first light source module comprises, in the direction of the outer boundary, a dominant light source that is located farther away from the outer boundary than at least one other light source of said at least one second light source module and emits a dominant color to a section of a light mixing area present above the at least one first light source module, wherein at least one of the light sources of the first light source module and that at least one second light source module is controlled such that the influence of the dominant color in the section of the light mixing area located above the at least one first light source is cancelled out.

13. The system according to claim 12, wherein the at least one first light source module further comprises the dominant light source, wherein the light sources of the at least one first light source module are controlled such that the light intensity of the dominant light source of the at least one first light source module is decreased relative to the light intensities of the other light sources of the at least one first light source module.

14. The system according to claim 12, wherein the at least one first light source module further comprises the dominant light source, wherein the light sources of the at least one first light source module are controlled such that the light intensity of at least one other light source of the at least one first light source module is increased relative to the light intensity of the dominant light source at the at least one first light source module.

15. The system according to claim 11, further comprising a color control unit that operates in a calibration mode and performs the steps of:

determining at least one calibration parameter by adapting the light control signals for the at least one first light source module until a color emitted by a section of the diffuser that is illuminated by the at least one first light source module corresponds to the desired uniform color,

storing the at least one calibration parameter, and

subsequently using the at least one calibration parameter for the light sources of the at least one first light source module.