LIGHTING DEVICES FOR ILLUMINATING PRINTED MATERIAL

• US 20170011670A1
• Filed: 07/07/2016
• Published: 01/12/2017
• Est. Priority Date: 07/07/2015
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CI Holdings C.V. (Wolfspeed, Inc.)
• Inventors: van de Ven, Antony Paul, Roberts, John, Jacobson, Benjamin A., Leung, Michael, Gupta, Nalini
• Granted Patent: US 9,799,243 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 23/0442 activated by means of a sensor, e.g. motion or photodetectors
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• 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: G09F 13/02 Signs, boards, or panels, illuminated by artificial light sources positioned in front of the insignia
• CPC Class Codes: G09F 13/04 Signs, boards or panels, illuminated from behind the insignia
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 2013/222 with LEDs
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: H05B 47/105 : in response to determined parameters
• CPC Class Codes: H05B 47/11 : by determining the brightness or colour temperature of ambient light

Abstract

Combinations of solid state light emitters, optionally arranged to stimulate one or more lumiphoric materials, are used to illuminate surfaces (e.g., upright surfaces) including printed material produced with CMY or CMYK inks. Vibrancy and/or efficacy may be enhanced by increasing the effective steepness of printed ink reflectance wavelength boundaries by illuminating printed material with solid state light emitters of multiple colors having tailored boundaries (e.g., increased separation between colors and/or increased energy in spectral areas highly reflected by CMY inks, or reducing energy of emissions at wavelengths to which the human eye is less sensitive). Lighting devices may include multiple operating modes having different gamut properties (e.g., relative gamut values). One or more subregions of an upright surface bearing printed material may be preferentially illuminated with an array of solid state light emitters including multiple emitters having different peak wavelengths.

Claims

1. A lighting device configured for illuminating a surface including printed material, the lighting device comprising:

a plurality of solid state light emitter groups, wherein each solid state light emitter group of the plurality of solid state light emitter groups includes at least one first solid state light emitter arranged to generate first emissions comprising a first peak wavelength, and at least one second solid state light emitter arranged to generate second emissions comprising a second peak wavelength that differs by at least 40 nm from the first peak wavelength and differs by at least 40 nm from any other peak wavelength optionally generated by the at least one first solid state light emitter;

wherein aggregate emissions of the lighting device include emissions of the plurality of solid state light emitter groups and provide a luminous flux of at least 2000 lumens; and

wherein aggregate emissions of the lighting device comprise a luminous efficacy of at least 70 lumens per watt.

2. The lighting device of claim 1, wherein each solid state light emitter group of the plurality of solid state light emitter groups includes at least one third solid state light emitter arranged to generate third emissions comprising a third peak wavelength that differs from the second peak wavelength by at least 40 nm, that differs from the first peak wavelength by at least 40 nm, and that differs by at least 40 nm from any other peak wavelengths optionally generated by the at least one first solid state light emitter and the at least one second solid state light emitter.

3. The lighting device of claim 2, comprising at least one of the following features (i) or (ii):

(i) the at least one second solid state light emitter is arranged to produce emissions having a full width-half maximum intensity value of no greater than 35 nm;

or (ii) the third peak wavelength is in a range of from 630 nm to 680 nm.

4. The lighting device of claim 1, wherein the surface including printed material comprises an upright surface including printed material, and the plurality of solid state light emitter groups is arranged in front of the upright surface including printed material, or is arranged behind an illuminated surface of the upright surface including printed material.

5. An outdoor billboard, poster, or illuminated sign comprising the lighting device of claim 1.

6. A lighting device configured for illuminating a surface including printed material, the lighting device comprising:

a plurality of solid state light emitter groups, wherein each solid state light emitter group of the plurality of solid state light emitter groups includes at least one first solid state light emitter arranged to generate first emissions comprising a dominant wavelength in a blue range, at least one second solid state light emitter arranged to generate second emissions comprising a dominant wavelength in a green or yellow-green range, and at least one third solid state light emitter arranged to generate third emissions comprising a dominant wavelength in a red or red-orange range;

wherein aggregate emissions of the lighting device include at least a portion of the first emissions, at least a portion of the second emissions, and at least a portion of the third emissions; and

wherein the lighting device comprises at least one of the following features;

(a) the at least one first solid state light emitter is arranged to stimulate emissions of a lumiphoric material arranged to produce lumiphor emissions in a green or yellow-green range;

(b) the at least one second solid state light emitter is arranged to produce emissions having a full width-half maximum intensity value of no greater than 35 nm;

(c) the at least one third solid state light emitter comprises a peak wavelength in a range of from 630 nm to 680 nm;

or

(d) the aggregate emissions comprise a R9-prime color rendering value of greater than 110.

7. The lighting device of claim 6, comprising a control circuit configured to operate the plurality of solid state light emitter groups in a plurality of operating modes including a first mode wherein the aggregate emissions comprise a first relative gamut value and including a second mode wherein the aggregate emissions comprise a second relative gamut value, wherein the second relative gamut value is at least 10% greater than the first relative gamut value.

8. The lighting device of claim 6, wherein the aggregate emissions provide a luminous flux of at least 2000 lumens.

9. The lighting device of claim 6, wherein the aggregate emissions comprise a luminous efficacy of at least 70 lumens per watt.

10. The lighting device of claim 6, wherein each solid state light emitter group of the plurality of solid state light emitter groups further comprises at least one fourth solid state light emitter including a blue solid state light emitter arranged to stimulate emissions of a lumiphoric material arranged to produce lumiphor emissions in a green or yellow-green range.

11. The lighting device of claim 6, wherein at least one of the at least one first solid state light emitter, the at least one second solid state light emitter, and the at least one third solid state light emitter includes at least one lumiphoric material.

12. The lighting device of claim 6, wherein the surface including printed material comprises an upright surface including printed material, and the plurality of solid state light emitter groups is arranged in front of the upright surface including printed material, or is arranged behind an illuminated surface of the upright surface including printed material.

13. An outdoor billboard, poster, or illuminated sign comprising the lighting device of claim 6.

14. A lighting device configured for illuminating a surface including printed material, the lighting device comprising:

a plurality of solid state light emitter groups, wherein each solid state light emitter group of the plurality of solid state light emitter groups includes at least one first solid state light emitter arranged to generate first emissions comprising a dominant wavelength in a blue range, at least one second solid state light emitter arranged to generate second emissions comprising a dominant wavelength in a green or yellow-green range, and at least one third solid state light emitter arranged to generate third emissions comprising a dominant wavelength in a red or red-orange range, wherein aggregate emissions of the lighting device include at least a portion of the first emissions, at least a portion of the second emissions, and at least a portion of the third emissions; and

a control circuit configured to operate the plurality of solid state light emitter groups in a plurality of operating modes including a first mode wherein the aggregate emissions comprise a first relative gamut value and including a second mode wherein the aggregate emissions comprise a second relative gamut value, wherein the second relative gamut value is at least 10% greater than the first relative gamut value.

15. The lighting device of claim 14, further comprising at least one sensor arranged to sense at least one of an environmental condition and a property of the surface and produce at least one sensor output signal, wherein the control circuit is configured to select or adjust an operating mode of the lighting device responsive to the at least one sensor output signal.

16. The lighting device of claim 14, further comprising a time signal generating element or time signal receiving element arranged to provide at least one signal indicative of time, wherein the control circuit is configured to select or adjust an operating mode of the lighting device responsive to the at least one signal indicative of time.

17. The lighting device of claim 14, wherein at least one of the at least one first solid state light emitter, the at least one second solid state light emitter, and the at least one third solid state light emitter includes at least one lumiphoric material.

18. The lighting device of claim 14, wherein the surface including printed material comprises an upright surface including printed material, and the plurality of solid state light emitter groups is arranged in front of the upright surface including printed material, or is arranged behind an illuminated surface of the upright surface including printed material.

19. An outdoor billboard, poster, or illuminated sign comprising the lighting device of claim 14.

20. A lighting device configured for illuminating an upright surface including printed material, the lighting device comprising:

an array of solid state light emitter groups, wherein each solid state light emitter group of the array of solid state light emitter groups includes at least one first solid state light emitter arranged to generate first emissions comprising a dominant wavelength in a blue range, at least one second solid state light emitter arranged to generate second emissions comprising a dominant wavelength in a green or yellow-green range, and at least one third solid state light emitter arranged to generate third emissions comprising a dominant wavelength in a red or red-orange range, wherein aggregate emissions of the lighting device include at least a portion of the first emissions, at least a portion of the second emissions, and at least a portion of the third emissions; and

a control circuit configured to adjust operation of one or more solid state light emitters or subgroups of the array of solid state light emitter groups to preferentially illuminate one or more subregions of the upright surface.

21. The lighting device of claim 20, further comprising at least one sensor arranged to sense at least one of an environmental condition and a property of the upright surface and produce at least one sensor output signal, wherein the control circuit is configured to adjust operation of one or more solid state light emitters or subgroups of the array of solid state light emitter groups to preferentially illuminate one or more subregions of the upright surface responsive to the at least one sensor output signal.

22. An outdoor billboard, poster, or illuminated sign comprising the lighting device of claim 20.

23. A lighting device configured for illuminating printed material comprising first, second, and third colored inks, paints, or dyes providing first, second, and third reflectance spectra comprising first, second, and third peak wavelengths, respectively, that differ from one another by at least about 40 nm, the lighting device comprising:

at least one first solid state light source comprising a dominant wavelength within about 20 nm of the first peak wavelength;

at least one second solid state light source comprising a dominant wavelength within about 20 nm of the second peak wavelength; and

at least one third solid state light source comprising a dominant wavelength within about 20 nm of the third peak wavelength;

wherein the lighting device comprises two or more of the following characteristics (a) to (c);

(a) a luminous efficacy of at least 80 lumens per watt;

(b) an average color rendering index (CRI Ra) of at least 80; and

(c) a relative gamut (Qg) of at least 100.

24. The lighting device of claim 23, wherein one or more of the at least one first, the at least one second, or the at least one third solid state light source comprises a lumiphoric material.

25. The lighting device of claim 23, comprising a plurality of solid state light source clusters, wherein each solid state light source cluster of the plurality of solid state light source clusters includes a first solid state light source of the at least one first solid state light source, a second solid state light source of the at least one second solid state light source, and a third solid state light source of the at least one third solid state light source.

26. The lighting device of claim 23, comprising all three characteristics (a) to (c).

27. The lighting device of claim 23, being configured to illuminate an upright billboard or sign.

28. The lighting device of claim 23, wherein one or more of the at least one first, the at least one second, or the at least one third solid state light source comprises a lumiphor including a full width-half maximum intensity value of no greater than 35 nm.

29. The lighting device of claim 23, wherein aggregate emissions of the lighting device comprise a R9-prime color rendering value of greater than 110.