HIGH QUANTUM EFFICIENCY LIGHTING DEVICE WITH LIGHT INFLUENCING ELEMENT

• US 20110037053A1
• Filed: 04/10/2009
• Published: 02/17/2011
• Est. Priority Date: 04/17/2008
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Hikmet, Rifat Ata Mustafa, Van Bommel, Ties
• Application Number:
  US12/936,546
• Publication Number:
  US 20110037053A1
• Time in Patent Office: Days
• US Class Current: 257/13
• 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: G02B 26/02 for controlling the intensity of light G02B26/004 takes precedence
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: G02F 2201/122 having a particular pattern
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

The present invention relates to a high quantum efficiency lighting device comprising a solid state light source (54) and at least one light influencing element (10), being adapted to influence light emitted from solid state light source. The light influencing element (10) comprises a first electrode layer (11), and a second electrode layer (13), wherein the second electrode layer (13) is biased to remain in a rolled-up state, and adapted to be unrolled into an unrolled state in response to an electric potential applied between the first and second electrode layers, said second electrode layer in its unrolled state, extending across said optical light path, and being adapted to influence light emitted from the solid state light source (54).

Claims

1. A high quantum efficiency lighting device comprising

a solid state light source,

at least one light influencing element, arranged in an optical path of the light emitted from the solid state light source, which light influencing element comprises

a first electrode layer, and

a second electrode layer,

wherein the second electrode layer is biased to remain in a rolled-up state, and adapted to be unrolled into an unrolled state in response to an electric potential applied between the first and second electrode layers, said second electrode layer in its unrolled state, extending across said optical light path, and being adapted to influence light emitted from the solid state light source.

2. The high quantum efficiency lighting device according to claim 1 wherein the quantum efficiency of the light influencing element is at least 40%.

3. The high quantum efficiency lighting device according to claim 1 wherein the second electrode layer comprises a dielectric layer.

4. The high quantum efficiency lighting device according to claim 3 wherein the dielectric layer comprises phosphors, luminescent material, adapted to convert light to another color.

5. The high quantum efficiency lighting device according to claim 3 wherein the dielectric layer comprises a light direction altering surface relief or has a light direction altering internal structure.

6. The high quantum efficiency lighting device according to claim 1 wherein said second electrode layer is adapted to act as a reflector.

7. The high quantum efficiency lighting device according to claim 1 wherein said second electrode layer comprises at least two separately rollable portions arranged to extend across the same part of the path of light emitted from the solid state light source.

8. The high quantum efficiency lighting device according to claim 1 wherein said second electrode layer comprises at least two separately rollable portions arranged to extend across different parts of the path of light emitted from the solid state light source.

9. The high quantum efficiency lighting device according to claim 1 comprising at least two light influencing elements arranged in a stacked structure.

10. The high quantum efficiency lighting device according to claim 1 wherein the light influencing element is arranged in optical contact with the solid state light source.

11. The high quantum efficiency lighting device according to claim 1 further comprising

a chamber, of which the inside is a diffuse reflector, and

a diffuser, arranged at the exit opening of said chamber,

wherein the light influencing element is arranged between the solid state light source and said diffuser, at a distance from the solid state light source, which light influencing element is adapted to influence a part of the light emitted from the solid state light source, which part corresponds to the part of the path of light covered by the extension of the second electrode layer in its unrolled state, allowing remaining light to remain non-influenced, passing the light influencing element directly to said diffuser, the non-influenced light being mixed with the influenced light in said chamber.

12. The high quantum efficiency lighting device according to claim 1, further comprising

a first collimator, arranged between the solid state light source and the light influencing element,

wherein the light influencing element is arranged to cover an exit opening of said first collimator, and which light influencing element is arranged to adjust shape, direction and collimation of a beam of light emitted from the solid state light source, when the second electrode is in its unrolled state.

13. The high quantum efficiency lighting device according to claim 12, further comprising

a second collimator, arranged to collimate light that have passed through and been influenced by the second electrode layer being in its unrolled state.

14. The high quantum efficiency lighting device according to claim 6, comprising a plurality of tapered light influencing elements arranged to form a funnel shaped reflector when said plurality of second electrode layers are in the unrolled state, said funnel shaped reflector being arranged with its narrow opening on the emitting side of the solid state light source.

15. The high quantum efficiency lighting device according to claim 14, further comprising an outer reflector, adapted to reflect the light when the plurality of second electrode layers of the light influencing elements are in a rolled-up state.