Wavelength converting lighting device and associated methods

• US 9,036,244 B2
• Filed: 04/02/2014
• Issued: 05/19/2015
• Est. Priority Date: 03/28/2011
• Status: Active Grant

• Current Assignee: Healthe, Inc.
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Bastien, Valerie A., Zhou, Ran, Bartine, David E., Soler, Robert R., Maxik, Fredric S.
• Primary Examiner(s): TRA, TUYEN Q
• Application Number:
  US14/243,337
• Publication Number:
  US 20140211295A1
• Time in Patent Office: 412 Days
• Field of Search: 359290-292, 359/295, 359/298, 359/220, 359/223, 359/359, 359/489.19, 359/491.01, 359/589, 359/634, 359/722
• US Class Current: 359/291
• CPC Class Codes: G02B 26/08 for controlling the direction of light in light guides G02B6/35
• CPC Class Codes: G02B 26/0833 the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD G02B26/0825 takes precedence; micromechanical devices in general B81B
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A lighting device according to another embodiment of the invention for directing source light within a source wavelength range in a blue wavelength range in a desired output direction may comprise a MEMS device that may include a DMD that includes an array of MEMS cells, each MEMS cell including an operative surface to receive and redirect the source light towards the desired output direction. The array of MEMS cells may include first and second pluralities of MEMS cells including first and second conversion coatings applied to the operative surfaces thereof configured to convert source light into first and second wavelength ranges. Furthermore, the repositionable surface of each MEMS cell may be positionable between multiple angles to reflect the converted light. The lighting device may comprise a third plurality of MEMS cells where the operative surfaces thereof is devoid of a conversion coating, or, alternatively, comprises a third conversion coating.

Claims

1. A lighting device for directing source light within a source wavelength range in a desired output direction, the lighting device comprising:

a micro electromechanical system (MEMS) device including a digital micromirror device (DMD) that includes an array of MEMS cells, each MEMS cell including an operative surface to receive and redirect the source light towards the desired output direction, the array of MEMS cells including;

a first plurality of MEMS cells including a first conversion coating applied to the operative surface of each MEMS cell of the first plurality of MEMS cells,

a second plurality of MEMS cells including a second conversion coating applied to the operative surface of each MEMS cell of the second plurality of MEMS cells, and

a third plurality of MEMS cells including a third conversion coating applied to the operative surface of each MEMS cell of the third plurality of MEMS cells,

wherein the first conversion coating is configured to convert the source light into a converted light within a first converted wavelength range,

wherein the second conversion coating is configured to convert the source light into a converted light within a second converted wavelength range that is different from the first converted wavelength range,

wherein the third conversion coating is configured to convert the source light into a converted light within a third converted wavelength range that is different from each of the first and second converted wavelength ranges, and

wherein the repositionable surface of each MEMS cell is positionable between multiple angles to reflect the converted light.

2. The lighting device according to claim 1 wherein the source light is a monochromatic light.

3. The lighting device according to claim 1 wherein the source light is a bichromatic light.

4. The light source according to claim 1 wherein the source light is a polychromatic light.

5. The lighting device according to claim 1 wherein the source wavelength range is within at least one of a blue spectrum and an ultraviolet spectrum.

6. The lighting device according to claim 5 wherein the source wavelength range of the source light within the ultraviolet spectrum is between 200 nanometers and 400 nanometers.

7. The lighting device according to claim 5 wherein the source wavelength range of the source light within the blue spectrum is between 400 nanometers and 500 nanometers.

8. The lighting device according to claim 1 wherein at least one of the first conversion coating, the second conversion coating, and the third conversion coating includes a phosphorous wavelength converting material.

9. The lighting device according to claim 1 wherein the first conversion coating is configured to generate a red light.

10. The lighting device according to claim 1 wherein the second conversion coating is configured to generate a green light.

11. The lighting device according to claim 1 wherein the third conversion coating is configured to generate a blue light.

12. The lighting device according to claim 1 further comprising:

a position detecting device configured to sense a location to define a location of a sensed projection surface; and

a repositioning device configured to reposition the MEMS device to project the converted light to the location of the sensed projection surface.

13. A lighting device for directing source light within a source wavelength range in a blue wavelength range in a desired output direction, the lighting device comprising:

a micro electromechanical system (MEMS) device including a digital micromirror device (DMD) that includes an array of MEMS cells, each MEMS cell including an operative surface to receive and redirect the source light towards the desired output direction, the array of MEMS cells including;

a first plurality of MEMS cells including a first conversion coating applied to the operative surface of each MEMS cell of the first plurality of MEMS cells, and

a second plurality of MEMS cells including a second conversion coating applied to the operative surface of each MEMS cell of the second plurality of MEMS cells,

wherein the first conversion coating is configured to convert the source light into a converted light within a first converted wavelength range,

wherein the second conversion coating is configured to convert the source light into a converted light within a second converted wavelength range that is different from the first converted wavelength range, and

wherein the repositionable surface of each MEMS cell is positionable between multiple angles to reflect the converted light.

14. The lighting device according to claim 13 wherein the source wavelength range of the source light within the blue spectrum is between 400 nanometers and 500 nanometers.

15. The lighting device according to claim 13 wherein at least one of the first conversion coating and the second conversion coating includes a phosphorous wavelength converting material.

16. The lighting device according to claim 13 wherein the first conversion coating is configured to generate a red light.

17. The lighting device according to claim 13 wherein the second conversion coating is configured to generate a green light.

18. The lighting device according to claim 13 further comprising a third plurality of MEMS cells where the operative surface of each MEMS cell of the third plurality of MEMS cells is devoid of a conversion coating.

19. The lighting device according to claim 13 further comprising:

a position detecting device configured to sense a location to define a location of a sensed projection surface; and

a repositioning device configured to reposition the MEMS device to project the converted light to the location of the sensed projection surface.

20. A lighting device for directing source light within a source wavelength range in a blue wavelength range between 400 nanometers and 500 nanometers in a desired output direction, the lighting device comprising:

a micro electromechanical system (MEMS) device including a digital micromirror device (DMD) that includes an array of MEMS cells, each MEMS cell including an operative surface to receive and redirect the source light towards the desired output direction, the array of MEMS cells including;

a first plurality of MEMS cells including a first conversion coating applied to the operative surface of each MEMS cell of the first plurality of MEMS cells configured to generate a red light,

a second plurality of MEMS cells including a second conversion coating applied to the operative surface of each MEMS cell of the second plurality of MEMS cells configured to generate a green light, and

a third plurality of MEMS cells where the operative surface of each MEMS cell of the third plurality of MEMS cells is devoid of a conversion coating,

wherein the first conversion coating is configured to convert the source light into a converted light within a first converted wavelength range,

wherein the second conversion coating is configured to convert the source light into a converted light within a second converted wavelength range that is different from the first converted wavelength range, and

wherein the repositionable surface of each MEMS cell is positionable between multiple angles to reflect the converted light;

a position detecting device configured to sense a location to define a location of a sensed projection surface; and

a repositioning device configured to reposition the MEMS device to project the converted light to the location of the sensed projection surface.