Pixelated color management display

• US 7,255,448 B2
• Filed: 10/20/2004
• Issued: 08/14/2007
• Est. Priority Date: 10/20/2004
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Allen, William J., Collins, David C., Myers, Timothy F, Greer, Michael
• Primary Examiner(s): Sever; Andrew T.
• Application Number:
  US10/969,412
• Publication Number:
  US 20060082560A1
• Time in Patent Office: 1,028 Days
• Field of Search: 353/33, 353/20, 353/81, 353/84, 353/97, 353/31, 348/742, 348/756, 348/757, 348/759, 349/57, 349 61- 64, 349/8, 349/9, 349/5, 349/80
• US Class Current: 353/84
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: H04N 9/3108 by using a single electronic spatial light modulator

Abstract

A display system includes a light source, a spatial light homogenizer, and imaging optics. The spatial light modulator has a plurality of modulator pixels. The display system also includes a pixelated plate illuminated by the light source. The pixelated plate has a plurality of individually defined pixels formed thereon. The spatial light modulator is in optical communication with the pixelated color management device by the imaging optics and each of the modulator pixels is associated with at least one of the individually defined pixels of the pixelated plate.

Claims

1. A pixelated color management device, comprising:

a light source;

a spatial light homogenizer optically coupled to the light source;

a pixelated plate optically coupled to the spatial light homogenizer, the pixelated plate having a plurality of individually defined pixels for each of a plurality of colors;

a spatial light modulator having a plurality of individually defined pixels; and

imaging optics for projecting the image of the individually defined pixels of the pixelated plate onto the individually defined pixels of the spatial light modulator.

2. The device of claim 1 wherein the individually defined pixels of the pixelated plate are made of dielectric material wherein the light reflected from the pixelated plate is substantially recycled within the pixelated color management device.

3. The device of claim 2 wherein the light source includes a parabolic reflector and wherein the light reflected from the pixelated plate is reflected back to the parabolic reflector before being recycled.

4. The device of claim 2, wherein the spatial light homogenizer includes a reflective front face with a light entrance aperture and an end face, the spatial light homogenizer being configured to guide light between the reflective front face and the end face to recycle the light.

5. The device of claim 4, wherein the spatial light homogenizer comprises a glass integrating rod.

6. The device of claim 1, wherein the pixels of the pixelated plate are rectangular-shaped pixels having a size of approximately 5 μ

m per side.

7. The device of claim 1, wherein the pixels of the pixelated plate correspond to a color scheme.

8. The device of claim 7, wherein the color scheme is a red, green, and blue color scheme.

9. The device of claim 7, wherein the pixels of the pixelated plate comprise notch band filters corresponding to each color of the color scheme.

10. The device of claim 1, and further comprising a ¼

wave retarder and a polarizer coupled to the spatial light homogenizer.

11. The device of claim 10, wherein the ¼

wave retarder is coupled to a front face of the spatial light homogenizer and the polarizer is coupled to an end face of the spatial light homogenizer.

12. The device of claim 10, wherein the polarizer comprises a reflective polarizer.

13. The device of claim 1, and further comprising a ¼

wave retarder disposed within the spatial light homogenizer.

14. The device of claim 13, wherein the ¼

wave retarder is oriented at a 45 degree angle with respect to a major axis of the spatial light homogenizer.

15. The device of claim 1, further comprising:

a wobulation control circuit, wherein the wobulatlor, control circuit is configured to move an image of the pixelated plate formed by the imaging optics relative to the array of pixel elements.

16. The device of claim 15 wherein the wobulation control circuit modifies the optical path within the imaging optics in a least one direction.

17. The device of claim 15 wherein the wobulation control circuit controls at least one of an X and a Y direction of the pixelated plate.

18. The device of claim 15, further comprising:

display optics optically coupled to the spatial light modulator to project the individual array of pixels of the spatial light modulator in an X and Y direction to a display surface, and wherein the wobulation control circuit controls at least one of the X and Y direction of the display optics.

19. The device of claim 1 wherein the pixelated plate and the array of pixel elements are in non-parallel planes and the imaging optics provides keystone correction.

20. A display system, comprising:

a light source;

a spatial light homogenizer having a plurality of modulator pixels;

imaging optics; and

a pixelated plate illuminated by the light source, the pixelated plate having a plurality of individually defined pixels for each of a plurality of colors formed thereon, wherein the spatial light modulator is in optical communication with the pixelated color management device by the imaging optics and each of the modulator pixels is associated with at least one of the individually defined pixels of the pixelated plate.

21. The system of claim 20 wherein the spatial light homogenizer includes a reflective front face with a light entrance aperture and an end face, the spatial light homogenizer being configured to guide light between the reflective front face and the end face.

22. The system of claim 20 wherein the light source includes a parabolic reflector.

23. The system of claim 20, wherein the spatial light modulator comprises a digital mirror device.

24. The system of claim 20, wherein the spatial light modulator comprises a single panel diffractive light device.

25. The system of claim 20, wherein the spatial light modulator comprises a liquid crystal on silicon device.

26. The system of claim 20, wherein the spatial light modulator comprises a transmissive LCD microdisplay.

27. The system of claim 20, further comprising a ¼

wave dielectric plate disposed within the spatial light homogenizer and a 45 degree wire grid filter located between the pixelated plate and the spatial light modulator.

28. The system of claim 20, further comprising a wobulation control circuit configured to move the plurality of individually defined pixels of the pixelated plate relative to the plurality of modulator pixels of the spatial light modulator.

29. The system of claim 28 wherein the wobulation control circuit controls at least one of an X and a Y direction of the pixelated plate.

30. The system of claim 28, further comprising:

display optics optically coupled the spatial light modulator for projecting an image and wherein the wobulation control circuit modifies the optical path within the display optics.

31. The system of claim 28 wherein the pixelated plate and the plurality of modulator pixels are in non-parallel planes and the imaging optics provides keystone correction.

32. The system of claim 20, wherein the imaging optics is disposed between the pixelated plate and the spatial light modulator.

33. The system of claim 32 wherein the wobulation control circuit modifies the optical path within the imaging optics.

34. A display system. comprising:

a light source;

a pixelated plate having a plurality of individually defined pixels in each of a plurality of colors formed thereon, the pixelated plate being in optical communication with the light source;

a spatial light modulator in optical communication with the pixelated plate;

imaging optics disposed between the pixelated plate and the spatial light modulator; and

a controller coupled to the imaging optics, the controller being configured to shift a position of the pixelated plate relative to the spatial light modulator.

35. The system of claim 34. wherein the spatial light modulator has a plurality of pixels, and each the modulator pixels is associated with a plurality of the pixels on the pixelated plate over a sequential time frame.

36. The system of claim 34, wherein the pixels of the pixelated plate correspond to a color scheme.

37. The system of claim 34, wherein the color scheme comprises a red, green, and blue color scheme.

38. The system of claim 34, wherein the color scheme comprises a red, green, blue, and white color scheme.

39. The system of claim 34, wherein the controller is configured to shift a position of the spatial light modulator one pixel in at least one direction relative to the pixelated plate.

40. A display system, comprising:

a light source;

means for simultaneously providing a plurality of colors to each of a plurality of pixels, the means being optically coupled to the light source;

a spatial light modulator optically coupled to the means for providing simultaneous pixelated color providing a color field display; and

means for moving the simultaneous pixelated color relative to the spatial light modulator.

41. The system of claim 40, further comprising means for recapturing light.

42. The system of claim 40, further comprising means for polarizing light.

43. The system of claim 40, further comprising means for recapturing polarized light.

44. A display system, comprising:

means for providing a plurality of pixelated color components in each of a plurality of colors;

a spatial light modulator optically coupled to the means for providing a plurality of pixelated color components; and

means for shifting a position of the spatial light modulator relative to the means for providing a plurality of pixelated color components.

45. The method of claim 44, further comprising the step of repetitively adjusting the position of the pixelated plate relative to the spatial light modulator so as to cause light passing through a plurality of pixels on the pixelated plate to sequentially impinge an associated one pixel of the spatial light modulator.

46. The method of claim 44, further comprising the steps of:

projecting the light from the spatial light modulator to create a displayed image;

adjusting the position of the displayed image relative to a previously displayed image from the spatial light modulator so as to cause light passing through a plurality of pixels on the pixelated plate to sequentially impinge an associated one pixel of an perceived displayed image.

47. A method for generating color display images, comprising:

passing substantially white light through a spatial light homogenizer onto a pixelated plate having a plurality of defined pixels for each of a plurality of colors, each of the pixels being configured to allow a corresponding color band to pass therethrough and to reflect light of other color bands;

capturing the reflected light and redirecting the reflected light to the pixelated plate;

imaging the pixelated plate onto a spatial light modulator and

modulating the light with the spatial light modulator that is allowed to pass through each of the pixels on the pixelated plate.

48. The method of claim 47, further comprising the step of reflecting the captured reflected light within the spatial light homogenizer.

49. The method of claim 47, further comprising the step of polarizing the light in the spatial light homogenizer.

50. The method of claim 49, further comprising the step of filtering the polarized light for a defined polarization.