Methods and systems for calibrating rear projection video

• US 20070024820A1
• Filed: 11/15/2005
• Published: 02/01/2007
• Est. Priority Date: 07/29/2005
• Status: Active Grant

• Current Assignee: Optoma Technology Incorporated (Optoma Corporation)
• Original Assignee: Optoma Technology Incorporated (Optoma Corporation)
• Inventors: Chung, Yau
• Granted Patent: US 7,434,937 B2
• Time in Patent Office: Days
• US Class Current: 353/70
• CPC Class Codes: G03B 21/145 Housing details, e.g. position adjustments thereof
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

A video system includes a video projector located in a housing a display screen disposed adjacent to the housing, wherein the display screen is capable of being tilted to expose the video projector, logic for generating a test image to display on the tilted display screen in order to calibrate the video projector, logic for projecting the test image onto the tilted display screen; and logic for calibrating the video projector using the test image. The test image is altered to fit the tilted display screen.

Claims

1. A method for calibrating a video display system, comprising:

tilting a display screen of the video display system to expose a video projector;

generating a test image to display on the tilted display screen in order to calibrate the video projector;

projecting the test image onto the tilted display screen; and

calibrating the video projector using the test image,

wherein the test image is altered to fit the tilted display screen.

2. The method of claim 1, wherein the test image is altered by correcting trapezoidal distortion of the image displayed on the tilted display screen.

3. The method of claim 1 wherein generating the test image comprises:

retrieving the test image from memory which has been altered to fit the tilted display screen.

4. The method of claim 1, wherein generating the test image comprises:

determining an amount to alter the test image based on an angle of tilt of the display screen; and

altering the test image based on the determined amount.

5. The method of claim 4, further comprising:

storing the altered test image in memory.

6. The method of claim 4, wherein the test image is altered to compensate for a trapezoidal distortion of the test image.

7. The method of claim 4, wherein determining the amount to alter the test image comprises:

projecting an unaltered test image on the tilted display screen; and

modifying the unaltered test image until the unaltered test image fits the tilted display screen.

8. The method of claim 7, wherein modifying the test image comprises modifying at least one dimension of the unaltered test image.

9. The method of claim 7, wherein modifying the test image comprises:

receiving input from a user when the unaltered test image fits the tilted display screen.

10. A video system, comprising:

a video projector located in a housing;

a display screen disposed adjacent to the housing, wherein the display screen is capable of being tilted to expose the video projector;

logic for generating a test image to display on the tilted display screen in order to calibrate the video projector, wherein the test image is altered to fit the tilted display screen;

logic for projecting the test image onto the tilted display screen; and

logic for calibrating the video projector using the test image.

11. The video display system of claim 10, further comprising:

logic for determining an amount to alter the test image based on an angle of tilt of the display screen; and

logic for altering the test image based on the determined amount.

12. The video system of claim 11, wherein the logic for determining an amount to alter the test image, comprises:

logic for projecting an unaltered test image on the tilted display screen; and

logic for modifying the unaltered test image until the unaltered test image fits the tilted display screen.

13. The video system of claim 12, further comprising an input for receiving input from a user when the unaltered test image fits the tilted display screen.

14. The video system of claim 11, further comprising a memory for storing the altered test image.

15. The video system of claim 10, further comprising:

a memory for storing the test image.

16. The video system of claim 10, further comprising:

a video source housed within the video projector.

17. A video system, comprising:

means for projecting video onto a display screen, wherein the display screen is capable of being tilted to expose the video projecting means;

means for generating a test image to display on the tilted display screen in order to calibrate the video projector;

means for projecting the test image onto the tilted display screen; and

means for calibrating the video projector using the test image.

18. The video display system of claim 17, further comprising:

means for determining an amount to alter the test image based on an angle of tilt of the display screen; and

means for altering the test image based on the determined amount.

19. The video system of claim 18, wherein the logic for determining an amount to alter the test image, comprises:

means for projecting an unaltered test image on the tilted display screen; and

means for modifying the unaltered test image until the unaltered test image fits the tilted display screen.

20. The video system of claim 17, further comprising:

means for storing the test image.