Projecting a luminance image

• US 20070040989A1
• Filed: 08/17/2005
• Published: 02/22/2007
• Est. Priority Date: 08/17/2005
• Status: Active Grant

• Current Assignee: Dolby International AB (Dolby Laboratories Incorporated)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Allen, William, Weng, Jian-gang, May, Gregory, Bendsneyder, Ron
• Granted Patent: US 7,722,190 B2
• Time in Patent Office: Days
• US Class Current: 353/30
• CPC Class Codes: G03B 21/60 characterised by the nature of the surface
• CPC Class Codes: H04N 9/3114 by using a sequential colour filter producing one colour at a time

Abstract

Embodiments of projecting a luminance image are disclosed.

Claims

1. A projection system comprising:

a screen configured to display colors; and

a projector configured to project a luminance image on the screen.

2. The system of claim 1, wherein the screen is configured to actuate between a first state in which substantially an entirety of the screen is red, a second state in which the substantial entirety of the screen is blue and a third state in which the substantial entirety of the screen is green.

3. The system of claim 2, wherein the screen is configured to be in each of the first state, the second state and the third state at least 50 times per second.

4. The system of claim 1, wherein the screen is configured to display a color image.

5. The system of claim 4, wherein the luminance image has a greater resolution than the color image.

6. The system of claim 4 further comprising:

a controller to communicate with the screen and the projector, wherein the controller is configured to generate control signals based upon image data to direct the screen to display the color image and the projector to project the luminance image on the screen.

7. The system of claim 6, wherein the controller is configured to generate control signals based upon an anticipated discrepancy between a desired intensity of a color image and an anticipated actual intensity of the color image displayed by the screen and wherein the projector includes a configuration to project the luminance image on the screen in response to the control signals.

8. The system of claim 4, wherein the screen includes independently actuatable screen pixels.

9. The system of claim 8, wherein each screen pixel comprises:

electrodes;

a switching medium between the electrodes; and

colored reflector or filter surfaces proximate the switching medium.

10. The system of claim 9, wherein the switching medium comprises a polymer dispersed liquid crystal.

11. The system of claim 8, wherein each pixel is configured to selectively display distinct colors.

12. A controller comprising:

a memory containing instructions to display a color image upon a screen and to project a luminance image on the color image; and

a processor configured to generate control signals based upon the instructions.

13. The controller of claim 12, wherein the memory further comprises:

instructions to separate image data into color data and luminance data.

14. The controller of claim 12, wherein the processor is configured to generate control signals based upon the responsiveness of a screen to changes in the color image.

15. The controller of claim 14, wherein the memory contains predetermined response rates of the screen to changes in the color image.

16. The controller of claim 12, wherein the color image has a first resolution and wherein the luminance image has a second greater resolution.

17. A processor readable medium comprising:

instructions to display a color image upon a screen; and

instructions to project a luminance image on the screen.

18. The processor readable medium of claim 17 further comprising instructions to separate image data into color data and luminance data.

19. The processor readable medium of claim 17 further comprising instructions to adjust the luminance image based upon responsiveness of the screen to changes in the color image.

20. The processor readable medium of claim 17, wherein the instructions to display a color image upon the screen comprises instructions to selectively charge electrodes proximate a switching medium to vary a translucency of the medium.

21. The processor readable medium of claim 20, wherein the color image has a first resolution and wherein the luminance image has a second greater resolution.

22. An apparatus comprising:

means for communicating color data of an image to a screen; and

means for communicating luminance data of the image to a projector.

23. A method comprising:

displaying colors upon a screen; and

projecting a luminance image on the colors.

24. The method of claim 23, wherein displaying colors upon the screen further comprises displaying a red color on a substantial entirety of the screen, displaying a green color on the substantial entirety of the screen and displaying a blue color on the substantial entirety of the screen.

25. The method of claim 24, wherein displaying colors further comprises displaying a color image upon the screen.

26. The method of claim 25, wherein the color image has a first resolution and wherein the luminance image has a second greater resolution.

27. The method of claim 25 further comprising:

adjusting the luminance image based upon a responsiveness of the screen to changes in the color image.

28. The method of claim 25 further comprising actuating pixels of the screen independently of one another.

29. The method of claim 28 further comprising applying different electrical fields to distinct portions of one of the pixels.

30. The method of claim 23, wherein one of the screen and a projector projecting the luminance image have a slower response rate as compared to the other of the screen and the projector and wherein the method further comprises adjusting an intensity of the other of the screen and the projector based upon the slower responsitivity of said one of the screen and the projector.