Illumination path shifting

• US 20070047059A1
• Filed: 08/31/2005
• Published: 03/01/2007
• Est. Priority Date: 08/31/2005
• 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, Howard, P.
• Application Number:
  US11/218,169
• Publication Number:
  US 20070047059A1
• Time in Patent Office: Days
• US Class Current: 359/277
• CPC Class Codes: G02B 27/0933 Systems for active beam shaping by rapid movement of an element
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: H04N 5/7416 involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
• CPC Class Codes: H04N 9/3129 scanning a light beam on the display screen scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161
• CPC Class Codes: H04N 9/3152 for shaping the light beam beam shaping per se G02B27/09

Abstract

A projection assembly includes an illumination system and at least one light modulator panel in optical communication with the illumination system. An illumination path is defined between the illumination system and the light modulator panel. Further, the illumination system is configured to spatially shift at least a portion of the illumination path.

Claims

1. A projection assembly, comprising:

an illumination system, and

at least one light modulator panel in optical communication with said illumination system, wherein an illumination path is defined between said illumination system and said light modulator panel and wherein said illumination system is configured to spatially shift at least a portion of said illumination path relative to said at least one light modulator panel.

2. The assembly of claim 1, wherein said illumination system includes at least one coherent light source and an illumination optics assembly in optical communication with said coherent light source.

3. The assembly of claim 2, wherein coherent light source includes a laser light source.

4. The assembly of claim 1, wherein said light source is configured to be moved to spatially shift said illumination path.

5. The assembly of claim 1, wherein said light modulator panel comprises a reflective-type light modulator panel.

6. The assembly of claim 1, and further comprising display optics in optical communication with said light modulator panel.

7. The assembly of claim 1, wherein said illumination optics assembly includes a scattering assembly, an integrating tunnel, and a condenser lens.

8. The assembly of claim 7, wherein said scattering assembly includes a reflector having a focal point and a nose cone located at said focal point.

9. The assembly of claim 8, wherein said nose cone is configured to be vibrated at a displacement greater than about 2 microns at a frequency that is greater than about 60 Hz.

10. The assembly of claim 8, wherein at least one of said reflector and said nose cone is configured to be rotated.

11. The assembly of claim 8, wherein an illumination axis is defined substantially parallel to said illumination path and said integrating tunnel is configured to be vibrated substantially normal to said illumination axis.

12. A scattering assembly, comprising:

a reflector having a focal point; and

at least one nose cone located at said focal point, said nose cone being configured to be selectively moved.

13. The assembly of claim 12, wherein said nose cone is configured to be vibrated at a displacement of between about 2 to about 10 microns at a frequency that is greater than about 60 Hz.

14. The assembly of claim 12, wherein at least one of said reflector and said nose cone is configured to be rotated.

15. A method of modulating light, comprising:

generating light;

directing said light to a light modulator panel;

spatially shifting a path of said light before said light is incident on said light modulator panel; and

modulating said light.

16. The method of claim 15, wherein directing said light to said light modulator panel includes passing said light through an illumination optics assembly.

17. The method of claim 16, wherein passing said light through said illumination optics assembly includes passing said light through components including at least one of a) a scattering assembly having a reflector and a nose cone, b) an integrating device, and c) a condenser lens.

18. The method of claim 17, wherein spatially shifting said path of said light includes moving at least one component of said illumination optics assembly.

19. The method of claim 18, wherein spatially shifting said path of said light includes moving more than one of said components of said illumination optics assembly.

20. The method of claim 15, wherein the light is created by a laser and wherein spatially shifting a path of said light includes moving said laser.

21. A display system, comprising:

means for generating light;

means for modulating light; and

means for spatially shifting a path of said light between said means for generating light and said means for modulating light.

22. The system of claim 21, wherein said means for generating light includes means for generating laser light.

23. A method of using a force to make light from a light source more uniform when illuminated on a light modulator panel, comprising,

directing the light along an illumination path from the light source to the light modulator panel through an illumination optics assembly;

and

applying the force to at least one component of the illumination optics assembly to shift the light across the light modulator.

24. The method of claim 23 wherein the force is linear.

25. The method of claim 23 wherein the force is rotational.

26. The method of claim 23 wherein the light is coherent and wherein to make light more uniform includes reducing speckle effects.

27. The method of claim 23 wherein the force is applied at a frequency greater than the integration rate of an eye.

28. The method of claim 23 wherein the light includes multiple component beams of light and the force is applied to at least one of the multiple component beams.

29. The method of claim 23 wherein the illumination optics assembly includes an integrating tunnel and wherein the force is applied perpendicular to an optical axis of the light.

30. The method of claim 23 wherein the step of applying the force to at least one component of the illumination optics assembly includes applying multiple forces to shift multiple components.