Display with planar light source

• US 20060104061A1
• Filed: 11/16/2004
• Published: 05/18/2006
• Est. Priority Date: 11/16/2004
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Gupta, Anurag, Lerner, Scott
• Application Number:
  US10/991,035
• Publication Number:
  US 20060104061A1
• Time in Patent Office: Days
• US Class Current: 362/249.10
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: G02B 17/002 Arrays of reflective systems
• CPC Class Codes: G02B 19/0019 having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

An emitter having a planar light source with a concentrator formed adjacent thereto is herein disclosed.

Claims

1. An emitter comprising:

a substrate;

a planar light source deposited on the substrate; and

,

a concentrator having an inner wall and an upper opening and a lower opening, the concentrator being positioned upon the substrate such that the lower opening of the concentrator may receive light emitted from the planar light source.

2. The emitter of claim 1 wherein the upper opening of the concentrator is positioned adjacent an optical device and wherein the inner wall of the concentrator is arranged to direct substantially all of the light emitted from the planar light source onto the optical device.

3. The emitter of claim 1 wherein a plurality of emitters are formed on the substrate to form one of a display and a light source.

4. The emitter of claim 1 wherein the planar light source is a semiconductor device.

5. The emitter of claim 1 wherein the planar light source is one of an organic light emitting diode and a photonic crystal.

6. The emitter of claim 1 wherein the lower opening of the concentrator is smaller than the upper opening thereof.

7. The emitter of claim 6 wherein the inner wall of the concentrator has a shape chosen from a group consisting of conical, pyramidal, tetrahedral, tapered prismatic, parabolic, compound parabolic and spherical zones.

8. The emitter of claim 2 wherein the optical device is chosen from a group consisting of a polarizing filter, a diffraction grating, a liquid crystal display, a lens and a reflector.

9. The emitter of claim 2 wherein substantially all of the light emitted from the concentrator is incident upon the optical device at an angle between about 75°

and 90°

.

10. The emitter of claim 1 wherein the planar light source comprises a plurality of light emitting devices.

11. The emitter of claim 10 wherein the light emitting devices are one of an organic light emitting diode and a photonic crystal.

12. The emitter of claim 1 wherein a plurality of emitters forms a single pixel.

13. The emitter of claim 3 wherein each emitter forms a single grayscale pixel.

14. The emitter of claim 1 further comprising a color filter disposed adjacent the planar light source.

15. The emitter of claim 14 wherein a plurality of emitters having colored filters forms a single color pixel.

16. A device comprising:

a planar light source;

and a concentrator, the concentrator being positioned adjacent the planar light source.

17. The device of claim 16 wherein the planar light source and its associated concentrator are disposed on a substrate.

18. The device of claim 16 wherein the concentrator is arranged to concentrate and emit light received form the planar light source.

19. The device of claim 16 wherein the concentrator further comprises a reflective inner surface.

20. The device of claim 16 wherein the planar light source comprises one or more light emitting devices.

21. The device of claim 20 wherein the light emitting devices are chosen from a group consisting of an organic light emitting diode and a photonic crystal.

22. The device of claim 16 wherein substantially all of the light emitted from the concentrator is incident upon a lens.

23. The device of claim 16 wherein substantially all of the light emitted from the concentrator is incident upon a lens at an angle between about 75°

and 90°

as measured from the plane of the lens.

24. The device of claim 16 wherein the planar light source defines a pixel.

25. The device of claim 16 wherein an array of planar light sources defines a pixel.

26. The device of claim 24 wherein a plurality of the pixels output an image in grayscale.

27. The device of claim 24 wherein a plurality of the pixels output an image in color.

28. The device of claim 16 wherein the concentrator comprises an inner wall having an upper opening and a lower opening, the lower opening of the concentrator being positioned adjacent the planar light source, the lower opening being smaller than the upper opening of the concentrator.

29. The device of claim 28 wherein the inner wall of the concentrator has a shape chosen from a group consisting of conical, pyramidal, tetrahedral, tapered prismatic, parabolic, compound parabolic, and spherical zones.

30. A method of making a device comprising:

depositing on a substrate a planar light-emitting device; and

,

forming a concentrator adjacent the light-emitting device.

31. The method of making a device of claim 30 further comprising positioning the substrate adjacent an optical device such that substantially all of the light emitted from the upper opening of the concentrator is incident upon the optical device of the monitor.

32. The method of making a device of claim 31 wherein the substrate is positioned such that the light emitted from the concentrator is incident upon the optical device at an angle of between about 74°

and 90°

from the plane of the optical device.

33. The method of making a device of claim 30 further comprising forming the concentrator with a lower opening positioned to receive light emitted by the planar light-emitting device, an interior wall arranged to concentrate the light received from the light emitting device, and an upper opening for emitting the light from the light-emitting device.

34. The method of making a device of claim 30 further comprising applying a reflective coating to an interior surface of the concentrator.

35. The method of making a device of claim 30 wherein the substrate comprises multiple planar light emitting devices.

36. The method of making a device of claim 30 wherein the planar light-emitting device is selected from a group consisting of an organic light emitting diode and a photonic crystal.

37. The method of making a device of claim 30 wherein the planar light emitting device and the concentrator together define an emitter.

38. The method of making a device of claim 37 further comprising forming an emitter to define a pixel.

39. The method of making a device of claim 37 further comprising forming a plurality of emitters to define a pixel.

40. The method of making a device of claim 30 comprising forming a color filter over the planar light emitting device.

41. The method of making a device of claim 30 comprising forming an inner wall of the concentrator in a shape chosen from a group consisting of conical, pyramidal, tetrahedral, tapered prismatic, parabolic, compound parabolic and spherical zones.

42. An emitter comprising:

a planar light source, and;

a means for collecting and emitting light from the planar light source.

43. The emitter of claim 42 wherein the means has a lower opening positioned adjacent the planar light source and an upper opening positioned adjacent an optical device.

44. The emitter of claim 42 wherein the means comprises an interior surface having a shape chosen from a group consisting of conical, pyramidal, tetrahedral, tapered prismatic, parabolic, compound parabolic and a spherical zone.

45. The emitter of claim 42 wherein the light emitted from the means is incident upon an optical device at an angle between about 74°

and 90°

from the plane of the optical device.

46. The emitter of claim 45 wherein the optical device is chosen from a group consisting of a lens, polarizing filters, diffraction gratings, liquid crystal displays, reflectors.