Programmable light beam shape altering device using programmable micromirrors

• US 6,288,828 B1
• Filed: 07/21/1999
• Issued: 09/11/2001
• Est. Priority Date: 09/10/1997
• Status: Expired due to Term

• Current Assignee: Production Resource Group LLC
• Original Assignee: Light and Sound Design Limited
• Inventors: Hewlett, William E.
• Primary Examiner(s): Mack, Ricky
• Application Number:
  US09/359,064
• Time in Patent Office: 783 Days
• Field of Search: 359/290, 359/291, 359/292, 359/293, 359/295, 359/298, 359/223, 359/850, 359/896, 359/900, 353/28, 353/121
• US Class Current: 359/291
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means

Abstract

A digital micromirror device (“DMD”) is used to alter the shape of light that is projected onto a stage. The DMD selectively reflects some light, thereby shaping the light that is projected onto the stage. The control for the alteration is controlled by an image. That image can be processed, thereby carrying out image processing effects on the shape of the light that is displayed. One preferred application follows the shape of the performer and illuminates the performer using a shape that adaptively follows the performer'"'"'s image. This results in a shadowless follow spot.

Claims

1. A method of shaping a light beam in an electronic device, comprising:

projecting a beam of light;

obtaining an electronic image indicating a desired shape of said beam of light;

using software to control an electronically-controllable shape altering element which is located in a path of the beam of light based on said image; and

projecting an image which has been shaped based on the controlled shape altering element.

2. A method as in claim 1, wherein said control comprises processing edges of the image to change edge effects of the shape of the beam of light.

3. A method as in claim 1, further comprising rotating said image to rotate said shape.

4. A method as in claim 1, further comprising changing a duty cycle of the image.

5. A method as in claim 1, wherein said projecting an image comprises obtaining an image, using an outer perimeter of said image as a stencil, projecting parts inside said stencil, and not projecting parts outside said stencil.

6. A method as in claim 1, further comprising storing a plurality of images in a memory, selecting one of said images from said memory, and using said image to shape the beam.

7. A method as in claim 6, wherein said image in a memory is a bit mapped image.

8. A method as in claim 7, wherein said bit mapped image is stored in a compressed form.

9. A method as in claim 6, wherein said image in the memory represents a vectorized version of the image.

10. A method as in claim 6, further comprising electronically processing the image in real time while displaying the image.

11. A method as in claim 1, further comprising using image processing software to electronically process the image in real time while displaying the image.

12. A method as in claim 11, wherein said electronically processing comprises morphing the image.

13. A method as in claim 11, wherein said electronically processing comprises rotating the image.

14. A method as in claim 11, wherein said electronically processing comprises scaling the image to a different size.

15. A method as in claim 11, wherein said electronically processing comprises changing a look of an edge of the image.

16. A method as in claim 1, further comprising selecting a change to the image between one of edge processing, image processing, and duty cycle processing, and carrying out said operation to the image.

17. A method as in claim 1, wherein said electronically-controllable shape altering element is a digital mirror device.

18. A method of projecting a shaped light beam, comprising:

obtaining an image to use in shaping a light beam;

using said image to shape a light beam being projected;

requesting a change to said image;

dividing said change to said image into slices including at least first and second slices;

determining a time for an increment between said first slice and said second slice of changing the image; and

changing said image from a first characteristic to a second characteristic, using one of said slices at each of said times.

19. A method as in claim 18, wherein said changing said image comprises rotating said image, and wherein the rotation of the image is sliced into an amount of rotation which occurs at each time.

20. A method as in claim 18, wherein the changing the image is a shifting of position of the image, and wherein said slice is a number of pixels of shift per time period.

21. A method as in claim 18, wherein said changing comprises calculating a velocity of movement of said image, determining a number of pixels per slice for movement of said image, and determining times between slices using said pixels per slice and velocity of movement.

22. A method as in claim 21, further comprising, at each time, calculating a new image.