Resonant microcavity display

• US 6,614,161 B1
• Filed: 07/31/2000
• Issued: 09/02/2003
• Est. Priority Date: 07/20/1993
• Status: Expired due to Fees

• Current Assignee: Quantum Vision
• Original Assignee: The University of Georgia Research Foundation, Inc.
• Inventors: Jacobsen, Stuart M., Jones, Michieal L., Jaffe, Steven M., Eilers, Hergen
• Primary Examiner(s): Patel, Ashok
• Application Number:
  US09/628,490
• Time in Patent Office: 1,128 Days
• Field of Search: 313/463, 313/461, 313/466, 313/474, 313/506, 313/509, 313/113, 313/112, 313/114, 359/109, 346/161, 428/690, 428/917, 372/92
• US Class Current: 313/461
• CPC Class Codes: G02F 1/133521 Interference filters
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: H01J 29/28 with protective, conductive or reflective layers
• CPC Class Codes: H01J 61/42 by transforming the wavelength of the light by luminescence
• CPC Class Codes: H01J 63/06 Lamps with luminescent screen excited by the ray or stream
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair

Abstract

A resonant microcavity display (20) having microcavity with a substrate (25), a phosphor active region (50) and front and rear reflectors (30 and 60). The front and rear reflectors may be spaced to create either a standing or treaveling eledtromagnetic wave to enhance the efificenty of the light transmission.

Claims

1. A communications device comprising:

(a) a tunable resonant microcavity including two reflective layers; and

(b) an active region disposed between the two reflective layers and including a thin-film phosphor, such that a resonant standing wave can be produced between the two reflectors.

2. The communications device of claim 1, and further comprising electro-optic means for tuning the tunable resonant microcavity, the tunable resonant microcavity having a resonant frequency that can be tuned by said electro-optic means.

3. The communications device of claim 1, and further comprising piezo-electric means for tuning the tunable resonant microcavity, the tunable resonant microcavity having a resonant frequency that can be tuned by said piezo-electro means.

4. A communication device, comprising:

a tunable resonant microcavity with an active region between two reflective regions, said active region having a thin-film phosphor film disposed therein for emitting light of a selected wavelength.

5. The communication device of claim 4 wherein the two reflective regions further comprise:

a front reflective region; and

a back reflective region;

wherein said active region is positioned adjacent to said front reflective region, and said back reflective region is positioned adjacent to said active region and opposite to said front reflective region.

6. The communication device of claim 5 wherein said front reflective region and back reflective region are dielectric reflectors.

7. The communication device of claim 5 wherein said front reflective region and back reflective region each include a plurality of alternating first and second parallel layers, wherein first parallel layers of a material with a relatively low index of refraction alternate with second parallel layers of a material with a relatively high index of refraction.

8. The communication device of claim 5 wherein said front reflective region and back reflective region each include a plurality of alternating first and second parallel layers, wherein each first parallel layer has a relatively low index of refraction and is selected from the group consisting of fluorides and oxides.

9. The communication device of claim 5 wherein said front reflective region and back reflective region each include a plurality of alternating first and second parallel layers, wherein each second parallel layer has a relatively high index of refraction and is selected from the group consisting of sulfides, selenides, nitrides, and oxides.

10. The communication device of claim 4 wherein said active region has a phosphor film selected from the group consisting of films of sulfides, oxides, silicates, oxysulfides, and aluminates.

11. The communication device of claim 4 wherein said active region includes an activator selected from transition metals, rare earths and color centers.

12. The communication device of claim 4 wherein said phosphor is capable of being excited by light.

13. A communication device comprising:

a tunable resonant microcavity with an active region between two reflective regions;

said active region including a thin-film material capable of having spontaneous light emission, the spontaneous light emission from said active region being controllable in order to generate a communication signal and capable of creating one of a standing wave and a traveling wave in said tunable microcavity.

14. The communication device of claim 13 wherein:

said active region includes a thin-film active material capable of having spontaneous light emission being controllable in at least one of;

the amount of light emitted from the active region;

the angular spread of light emitted from the active region; and

the color of light emitted from the active region.

15. The communication device of claim 13 wherein:

said cavity is a resonant microcavity including front and back reflective regions.

16. The communication device of claim 13 wherein:

said active region includes a thin-film material that is a thin-film phosphor.

17. The communication device of claim 13 wherein:

said cavity includes a first reflector and a second reflector, which first reflector is positioned opposite to said second reflector with said thin-film material of said active region located between said first reflector and said second reflector.

18. The communication device of claim 17 wherein:

said first and second reflectors are asymmetric.

19. The communication device of claim 13 wherein:

said active region includes a thin-film material that can be excited by photons.

20. The communication device of claim 13 wherein:

said active region includes a thin-film material that can be excited in order to generate photoluminescence.

21. The communication device of claim 13 including:

a second cavity located relative to said cavity.

22. The communication device of claim 13 including:

a plurality of cavities located relative to said cavity.

23. A communication device comprising:

a tunable resonant microcavity having an active region disposed between two reflective regions; and

wherein said active region has a thin-film phosphor disposed therein for spontaneously emitting light in order to generate a communication signal.

24. A communication device of claim 23 wherein:

said resonant microcavity is a thin-film resonant microcavity.

25. A communication device comprising:

a resonant microcavity including an active region between two reflective regions, the active region having a thin-film phosphor disposed therein for emitting light for communicating a signal;

wherein said microcavity has means for modifying a process selected from the group consisting of spontaneous emission processes of the phosphor and energy transfer processes of the phosphor;

said microcavity having;

(a) a substrate; and

(b) a structure disposed upon said substrate including the active region and a plurality of reflective regions; and

wherein the active region includes an organic material.

26. A communication device comprising:

a resonant microcavity including an active region between two reflective regions, the active region having a thin-film phosphor disposed therein for emitting light for communicating a signal;

wherein said microcavity has means for modifying a process selected from the group consisting of spontaneous emission processes of the phosphor and energy transfer processes of the phosphor;

said microcavity having;

(a) a substrate; and

(b) a structure disposed upon said substrate including the active region and a plurality of reflective regions; and

wherein the reflective regions are of an organic material.

27. A communication device comprising:

a resonant microcavity including an active region between two reflective regions, the active region having a thin-film phosphor disposed therein for emitting light for communicating a signal;

wherein said microcavity includes means for modifying a process selected from the group consisting of spontaneous emission processes of the phosphor and energy transfer processes of the phosphor;

wherein said microcavity further includes;

(a) a substrate; and

(b) a structure disposed upon said substrate including the active region and a plurality of reflective regions; and

in which at least one of the plurality of reflective regions includes a photonic band gap material.

28. A communication device comprising:

an active region including a thin-film phosphor, the active region having a first side and a second side;

a first mirror located adjacent the first side of said active region;

a second mirror located adjacent the second side of said active region; and

a voltage generating device connected between said first mirror and said second mirror;

wherein a resonant standing wave can be produced between the two mirrors.