Correcting luminance non-uniformity in a tiled projection system

• US 7,936,943 B2
• Filed: 07/02/2007
• Issued: 05/03/2011
• Est. Priority Date: 07/02/2007
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Aufranc, Richard, Way, Olan C.
• Primary Examiner(s): Wu; Jingge
• Assistant Examiner(s): Koziol; Stephen R
• Application Number:
  US11/824,851
• Publication Number:
  US 20090009722A1
• Time in Patent Office: 1,401 Days
• Field of Search: 382/274, 353/30, 353/121
• US Class Current: 382/274
• CPC Class Codes: G03B 21/26 Projecting separately subsidiary matter simultaneously with main image

Abstract

A method of correcting luminance non-uniformity in a tiled projection system is disclosed. The method includes projecting with a plurality of projection devices a composite image wherein the composite image comprises a plurality of tiled images on a display surface with an overall luminance and correcting a luminance non-uniformity of the plurality of tiled images, wherein the luminance non-uniformity is based on a dimmed at least one of the plurality of tiled images, wherein correcting the luminance non-uniformity comprises utilizing at least one of the plurality of projection devices to adjust the overall luminance of the plurality of tiled images on the display surface.

Claims

1. A method of correcting luminance non-uniformity in a tiled projection system comprising;

projecting with a plurality of projection devices a composite image wherein the composite image comprises a plurality of tiled images on a display surface with an overall luminance, each of the plurality of tiled images being projected by an associated first projection device and an associated second projection device redundant with the associated first projection device; and

correcting a luminance non-uniformity of the plurality of tiled images, wherein the luminance non-uniformity is based on a dimmed at least one of the plurality of tiled images resulting from a first energy output of the associated first projection device associated with the dimmed at least one of the plurality of tiled images, wherein correcting the luminance non-uniformity comprises raising energy output of the associated second projection device associated with the dimmed at least one of the plurality of tiled images.

2. The method of claim 1 wherein the dimmed at least one of the plurality of tiled images comprises a luminance and utilizing at least one of the plurality of projection devices to adjust the overall luminance of the plurality of tiled images on the display surface further comprises:

utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

3. The method of claim 2 wherein utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images further comprises:

utilizing at least one of the non-dimmed plurality of projection devices to roll off the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

4. The method of claim 2 wherein each of the plurality of projection devices comprises an optical aperture and utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images further comprises:

adjusting the optical aperture of at least one of the plurality of projection devices to adjust the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

5. The method of claim 2 wherein each of the plurality of projection devices comprises a light source wherein utilizing at least one of the plurality of projection devices to adjust the overall luminance of the plurality of tiled images on the display surface further comprises:

adjusting the light source of at least one of the plurality of projection devices to adjust the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

6. The method of claim 2 wherein each of the plurality of projection devices comprises a video signal with at least one video signal value wherein utilizing at least one of the plurality of projection devices to adjust the overall luminance of the plurality of tiled images on the display surface further comprises:

adjusting at least one of the video signal values of at least one of the plurality of projection devices to adjust the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

7. The method of claim 1 wherein correcting a luminance non-uniformity of the plurality of tiled images further comprises:

minimizing a luminance difference between a non-dimmed at least one of the plurality of tiled images and the dimmed at least one of the plurality of tiled images.

8. A non-transitory computer program product for correcting luminance non-uniformity in a tiled projection system, the computer program product comprising a non-transitory computer readable medium having computer readable program means for causing a computer to perform the steps of:

projecting with a plurality of projection devices a composite image wherein the composite image comprises a plurality of tiled images on a display surface with an overall luminance, each of the plurality of tiled images being projected by an associated first projection device and an associated second projection device redundant with the associated first projection device; and

correcting a luminance non-uniformity of the plurality of tiled images, wherein the luminance non-uniformity is based on a dimmed at least one of the plurality of tiled images resulting from a first energy output of the associated first projection device associated with the dimmed at least one of the plurality of tiled images, wherein correcting the luminance non-uniformity comprises raising energy output of the associated second projection device associated with the dimmed at least one of the plurality of tiled images.

9. The computer program product of claim 8 wherein the dimmed at least one of the plurality of tiled images is associated comprises a luminance and utilizing at least one of the plurality of projection devices to adjust the overall luminance of the plurality of tiled images on the display surface further comprises:

utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

10. The computer program product of claim 9 wherein utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images further comprises:

utilizing at least one of the non-dimmed plurality of projection devices to blend the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

11. The computer program product of claim 9 wherein each of the plurality of projection devices comprises an optical aperture and utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images further comprises:

adjusting the optical aperture of at least one of the plurality of projection devices to adjust the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

12. The computer program product of claim 9 wherein each of the plurality of projection devices comprises a light source wherein utilizing at least one of the plurality of projection devices to adjust the overall luminance of the plurality of tiled images on the display surface further comprises:

adjusting the light source of at least one of the plurality of projection devices to adjust the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

13. The computer program product of claim 9 wherein each of the plurality of projection devices comprises a video signal with at least one video signal value wherein utilizing at least one of the plurality of projection devices to adjust the overall luminance of the plurality of tiled images on the display surface further comprises:

adjusting at least one of the video signal values of at least one of the plurality of projection devices to adjust the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

14. The computer program product of claim 8 wherein correcting a luminance non-uniformity of the plurality of tiled images further comprises:

minimizing a luminance difference between a non-dimmed at least one of the plurality of tiled images and the dimmed at least one of the plurality of tiled images.

15. A multi-projector system comprising:

a plurality of projection devices;

a tiled display including a plurality of display tiles for displaying a substantially tiled image, wherein each of the plurality of display tiles is configured to receive a projected image from a first projection device of the plurality of projection devices and to receive the projected image from a second projection device of the plurality of projection devices and wherein the tiled display comprises an overall luminance;

a processing unit coupled to the at least two projection devices and the tiled display wherein the processing unit includes logic for correcting a luminance non-uniformity of the plurality of display tiles, wherein the luminance non-uniformity is based on a dimmed one of the plurality of display tiles resulting from a first energy output of the first projection device associated with the dimmed at least one of the plurality of display tiles, wherein correcting the luminance non-uniformity comprises raising energy output of the second projection device associated with the dimmed at least one of the plurality of display tiles.

16. The system of claim 15 wherein the dimmed at least one of the plurality of tiled images is comprises a luminance and utilizing at least one of the plurality of projection devices to adjust the overall luminance of the plurality of tiled images on the display surface further comprises:

utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

17. The system of claim 16 wherein utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images further comprises:

utilizing at least one of the non-dimmed plurality of projection devices to blend the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.

18. The system of claim 16 wherein each of the plurality of projection devices comprises an optical aperture and utilizing at least one of the plurality of projection devices to lower the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images further comprises:

adjusting the optical aperture of at least one of the plurality of projection devices to adjust the overall luminance to match the luminance of the dimmed at least one of the plurality of tiled images.