Programmable light beam- shaped altering device using programmable digital micromirrors

• US 5,940,204 A
• Filed: 10/17/1997
• Issued: 08/17/1999
• Est. Priority Date: 02/07/1996
• 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): Epps, Georgia
• Assistant Examiner(s): BURKE, MARGARET A
• Application Number:
  US08/953,355
• Time in Patent Office: 669 Days
• Field of Search: 359/223, 359/298, 359/850, 359/896, 359/900, 353/28, 353/121
• US Class Current: 359/298
• CPC Class Codes: F21S 10/007 using rotating transparent or colored disks, e.g. gobo wheels
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: G02B 26/0833 the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD G02B26/0825 takes precedence; micromechanical devices in general B81B
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]
• CPC Class Codes: Y10S 359/90 Methods

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 light projecting device which changes a shape of light projecting therethrough, comprising:

a processor element, running image processing software of a type that accepts an input image and makes some change to the input image, said processor element operating based on an image and changing said image using said image processing software, said processor producing an output signal indicative of the changed image; and

a digital light altering device, connected to said processor element and responsive to said output signal, said digital light altering device producing an area which passes light so that a shape of the light that is passed is based on said area produced by said digital light altering device and is based on said changed image.

2. A device as in claim 1 wherein said digital light altering device includes individual elements, each of which controls a portion of a resulting scene.

3. A device as in claim 1 wherein said light altering device is a mirror which is selectively switchable between first and second positions.

4. A method of operating a gobo, comprising:

defining a gobo shape using a software-based system, to provide a computer file indicative of an image of the gobo shape; and

using the computer file indicative of the image of the gobo shape to form an image that represents the computer file, and project a beam of light to a stage, said light beam shaped according to a gobo formed from said computer file.

5. A method as in claim 4 wherein said defined shape is a stencil, and the image is light that is within the stencil shape.

6. A method as in claim 4 wherein a complement of said defined shape is used to project the image.

7. A method as in claim 4 wherein said defining comprises carrying out an image processing operation on the image to change a shape of the gobo being displayed, the shape being changed each time the image processing operation occurs.

8. A method as in claim 7, wherein said image processing operation is one of an edge effects processing;

an image shape processing; and

a duty cycle processing operation.

9. A method as in claim 7 further comprising defining slices of time at which different image-processed images are to be displayed, and displaying incremental changes of the image processing software at said defined times.

10. A method as in claim 4, further comprising changing the image in software, and displaying the changed image as it is changed.

11. A method as in claim 7 wherein said image processing operation includes rotation of the defined shape.

12. A method as in claim 7 wherein said image processing operation includes morphing of the defined shape from a first shape to a second shape.

13. A method as in claim 7 wherein said image processing operation includes forming an edge of the image which has a different gray scale value than another part of the image.

14. A method as in claim 7 wherein said image processing operation comprises modifying a color of the defined shape.

15. A method as in claim 7 wherein said image processing operation comprises strobing the defined shape on and off to change an intensity thereof.

16. A method of operating a gobo, comprising:

defining a gobo shape using a software-based system, to provide a computer file indicative of an image of the hobo shape; and

using the computer file indicative of the image of the hobo shape to project an image of light on the stage;

wherein said using comprises commanding a reflector to a first position to pass light to the stage, and commanding a reflector to a second position to reflect light away from the stage.

17. A method of operating a gobo, comprising:

defining a gobo shape using a software-based system, to provide a computer file indicative of an image of the gobo shape; and

using the computer file indicative of the image of the gobo shape to project an image of light on the stage,

wherein said defining a gobo shape comprises;

monitoring a shape of a performer on a stage;

forming an image which approximates the shape of the performer on the stage,

and wherein said using comprises using said image to shape a spot which is projected on the stage, so that a spot is formed which approximates the shape of the performer on the stage.

18. A method of altering a shape of a light beam transmitted to a stage in a stage lighting apparatus, comprising:

providing a plurality of reflectors which are controllable to change a direction of reflection thereof; and

controlling said reflectors so that some of said reflectors allow light to pass to the stage, and others of said reflectors reflect light away from the stage, to thereby shape a beam of light which is reflected towards the stage.

19. A method as in claim 18 wherein said controlling comprises controlling some of said reflectors to reflect light in a first direction which is away from the stage, and controlling others of said reflectors to reflect light in a second direction which is towards the stage.

20. Method as in claim 18 wherein said controlling comprises forming a digital file indicative of an image, and mapping values of said digital file to said reflectors to control states of said reflectors.

21. A method as in claim 20, further comprising image processing said image using image processing software.

22. A method of altering a light beam, comprising:

obtaining a digital representation file indicative of an image;

coupling the digital representation file to a display controller which drives a digital projection gate to form a passing shape based on contents of the digital representation file;

using the digital projection gate to change a shape of light that passes; and

changing said contents in some way while the digital representation file is coupled to the digital projection gate, thereby changing the shape of light passing characteristics of the digital projection gate.

23. A method as in claim 22 wherein said changing contents comprises image processing contents of the image using image processing software.

24. A method as in claim 23 wherein said changing comprises morphing from a representation indicative a first image to a representation indicative of a second image.

25. Method as in claim 23 wherein said changing comprises rotating an image.

26. A stage lighting apparatus, comprising:

a lighting element, producing a beam of light;

a light altering device, comprising an element which alters the beam of light based on a control signal applied thereto, said control signal being indicative of a shape; and

a processor, forming said control signal and connecting said control signal to said light altering device, said control signal changing over time, said light altering device responsive to change in said control signal to change a shape of the image, said processor operating to morph the shape between a first shape and a second shape, to thereby produce an output beam which is morphed between said first shape and said second shape.

27. An apparatus as in claim 26 wherein said processor comprises a time slicing element which defines intervals of time, and which forms intermediate shapes between the first shape and the second shape, and which produces said intermediate shapes at times which are synchronized with said intervals.

28. A stage lighting apparatus, comprising:

a shape-controllable light beam altering device, including an array of light beam modifying elements, said array being located in a path of a light beam, said array being controllable according to a control signal and said array changing in response to changes in said control signal;

a memory, storing a digital representation of an image, said digital representation being applied to said shape-controllable light beam altering device as said control signal, the value being indicative of an image shape which is to be applied to shape the light beam; and

a processor, including image processing software of a type which can be used to alter some characteristic of said digital representation of an image, said processor modifying said digital representation, and continuously providing a signal to said memory indicative of the control signal.

29. An apparatus as in claim 28 wherein said image processing software includes operation which morphs the image to a second image.

30. An apparatus as in claim 28 wherein said image processing software rotates the image.

31. An apparatus as in claim 28 wherein said image processing software shifts a position of the image.

32. An apparatus as in claim 28 wherein said image processing software modifies a characteristic of an edge of the image.

33. An apparatus as in claim 28 wherein said light beam altering device comprises a device which is responsive to an electrical control signal to reflect light in a different directions depending on connects of said control signal.

34. A stage lighting apparatus comprising:

a shape-controllable light beam altering device, including an array of light beam modifying elements, said array being located in a path of a light beam, said array being controllable according to a control signal and said array changing in response to chances in said control signal;

a memory, storing a digital representation of an image, said digital representation being applied to said shape-controllable light beam altering device as said control signal, the value being indicative of an image shape which is to be applied to shape the light beam; and

a processor, including image processing software of a type which can be used to alter some characteristic of said digital representation of an image, said processor modifying said digital representation, and continuously providing a signal to said memory indicative of the control signal,

wherein said light beam altering device includes an array of elements which vary a direction of light based on said control signal.

35. An apparatus as in claim 34 wherein said array of elements is a digital micromirror device.

36. An apparatus for displaying a variable intensity image on a stage, comprising:

a shape-controllable light beam altering device, including an array of light beam modifying elements, said array being located in a path of a light beam, said array being controllable according to a control signal and said array changing in response to changes in said control signal;

a memory, storing a digital representation of an image, said digital representation being applied to said shape-controllable light beam altering device as said control signal, said representation being indicative of an image shape which is to be applied to shape the light beam; and

a processor, including input of data defining a shape to be displayed and a desired intensity of the shape, and wherein said processor, in response to an intensity value lower than a predetermined threshold, produces a duty cycle signal, the duty cycle signal being used to selectively mask operation of said light altering device at a duty cycle faster than persistence of vision, said mask operation preventing any light from being projected to the display, to perform a dimming function.

37. A strobe gobo, comprising:

a plurality of selectively-direction reflecting devices, each device selectively passing light in a first direction or in a second direction, depending on an applied control signal; and

projection optics, optically in series with the plurality of direction reflecting devices, and receiving light from those devices which are passing light in the first direction, and passing the light from those devices to a stage; and

a processor, producing said control signal, said processor forming a duty cycle operation which provides a strobe effect.