Projector for digital cinema

• US 6,587,159 B1
• Filed: 05/13/1999
• Issued: 07/01/2003
• Est. Priority Date: 05/29/1998
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Dewald, Duane Scott
• Primary Examiner(s): Miller, John
• Assistant Examiner(s): Shang, Annan Q.
• Application Number:
  US09/311,011
• Time in Patent Office: 1,510 Days
• Field of Search: 348/750, 348/751, 348/756, 348/557, 348/766, 348/744, 348/770, 348/771, 348/781, 348/779, 353/37, 353/76, 353/77, 359/669, 359/839
• US Class Current: 348/744
• CPC Class Codes: G02B 13/08 Anamorphotic objectives
• CPC Class Codes: G02B 27/108 for sampling a portion of a beam or combining a small beam in a larger one, e.g. wherein the area ratio or power ratio of the divided beams significantly differs from unity, without spectral selectivity
• CPC Class Codes: G02B 27/141 using dichroic mirrors
• CPC Class Codes: G02B 27/40 Optical focusing aids
• CPC Class Codes: G02B 7/16 Rotatable turrets
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]
• CPC Class Codes: H04N 9/3105 for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10

Abstract

A digital cinema projection system (200) for projecting images onto a display screen. The projection system (200) comprises a lamp console (102) and a projector (202). The projector (202) receives digital image data, processes the digital image data to create an image data stream that is compatible with the chosen spatial light modulator, and uses the processed image data to modulate a beam of light from the lamp console (102). A primary projection lens (204) and lens adapter mounted on a rotatable turret (206) focus the modulated light onto a display screen. Alternatively, an integrated anamorphic projection lens is used to eliminate the need for a separate lens adapter.

Claims

1. An optical projection system comprising:

a lamp console, said lamp console comprising a lamp reflector and a lamp in said reflector, said lamp console for emitting a beam of light along a light path through an aperture in said console; and

a projector disposed on said light path, said projector for selectively modulating said beam of light in response to an image signal, said projector comprising;

a signal processor for receiving said image signal and formatting said image signal;

at least one spatial light modulator for receiving said formatted image signal and said beam of light, said at least one spatial light modulator for selectively reflecting portions of said beam of light along a projection light path in response to said formatted image signal;

optics for directing said beam of light onto said at least one spatial light modulator; and

a primary lens for focusing light in said projection light path onto an image plane.

2. The optical system of claim 1 wherein said at least one spatial light modulator is at least one digital micromirror device.

3. The optical system of claim 1 wherein said at least one spatial light modulator is three digital micromirror devices.

4. The optical system of claim 1 further comprising a lens turret disposed in said projection light path.

5. The optical system of claim 4, said lens turret comprising:

a lens holder; and

at least two apertures in said lens holder, said lens holder operable to position each of said at least two apertures in said projection light path.

6. The optical system of claim 4, said lens turret comprising:

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

a spherical lens in at least one of said turret apertures.

7. The optical system of claim 4, said lens turret comprising:

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

an anamorphic lens in at least one of said turret apertures.

8. The optical system of claim 1, such that the primary lens axis is parallel to the symmetric axis of the lamp and reflector.

9. The optical system of claim 1, such that the primary lens axis is colinear with the symmetric axis of the lamp and reflector.

23. The optical system of claim 1, wherein said primary lens is fixed relative to said optical system, said optical system comprising:

a lens turret disposed in said projection light path, said lens turret comprising;

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

a spherical lens in at least one of said turret apertures.

24. The optical system of claim 1, wherein said primary lens is fixed relative to said optical system, said optical system comprising:

a lens turret disposed in said projection light path, said lens turret comprising;

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

an anamorphic lens in at least one of said turret apertures.

10. An image projection system comprising:

a light source for projecting a beam of light along a light path;

a spatial light modulator disposed on said light path, said spatial light modulator having a 5;

4 aspect ratio and selectively modulating said beam of light; and

an anamorphic lens disposed on said light path, said anamorphic lens having a magnification ratio of 1.5;

1.

11. The image projection system of claim 10, said spatial light modulator comprising a digital micromirror device.

12. The image projection system of claim 10, said anamorphic lens positioned to provide offset projection of said beam of selectively modulated light.

13. An optical system for selectively modulating a beam of light in response to an image signal, said optical system comprising:

optics for receiving said beam of light directed along a first path and directing said beam of light onto said at least one spatial light modulator, said optics comprising;

an integrator receiving light from said mirror;

relay optics receiving light from said integrator; and

a prism assembly receiving light from said relay optics and for splitting said beam of light into three monochromatic beams of light;

a signal processor for receiving said image signal and formatting said image signal;

at least one spatial light modulator for receiving said formatted image signal and said beam of light, said at least one spatial light modulator for selectively reflecting portions of said beam of light along a projection light path in response to said formatted image signal; and

a primary lens for focusing light in said projection light path onto an image plane, said projection light path parallel to said first path.

14. The optical system of claim 13, said projection light path colinear with said first path.

15. The optical system of claim 13, said projection light path parallel with said first path.

16. The optical system of claim 13, wherein said at least one spatial light modulator is at least one digital micromirror device.

17. The optical system of claim 13, wherein said at least one spatial light modulator is three digital micromirror devices.

18. The optical system of claim 13, further comprising a lens turret disposed in said projection light path.

19. The optical system of claim 18, said lens turret comprising:

a lens holder; and

at least two apertures in said lens holder, said lens holder operable to position each of said at least two apertures in said projection light path.

20. The optical system of claim 18, said lens turret comprising:

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

a spherical lens in at least one of said turret apertures.

21. The optical system of claim 18, said lens turret comprising:

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

an anamorphic lens in at least one of said turret apertures.

22. The optical system of claim 13, said optics comprising:

a mirror receiving said light beam from said lamp and directing said light beam to said integrator.

25. The optical system of claim 13, wherein said primary lens is fixed relative to said optical system, said optical system comprising:

a lens turret disposed in said projection light path, said lens turret comprising;

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

a spherical lens in at least one of said turret apertures.

26. The optical system of claim 13, wherein said primary lens is fixed relative to said optical system, said optical system comprising:

a lens turret disposed in said projection light path, said lens turret comprising;

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

an anamorphic lens in at least one of said turret apertures.

27. An optical system comprising:

a lamp console, said lamp console comprising a lamp reflector and a lamp in said reflector, said lamp console for emitting a beam of light along a light path through an aperture in said console; and

a projector disposed on said light path, said projector for selectively modulating said beam of light in response to an image signal, said projector comprising;

a signal processor for receiving said image signal and formatting said image signal;

at least one spatial light modulator for receiving said formatted image signal and said beam of light, said at least one spatial light modulator for selectively reflecting portions of said beam of light along a projection light path in response to said formatted image signal;

optics for directing said beam of light onto said at least one spatial light modulator, said optics comprising;

an integrator in said light path for receiving light from said mirror;

relay optics in said light path for receiving light from said integrator; and

a prism assembly in said light path for receiving light from said relay optics and for splitting said beam of light into three monochromatic beams of light; and

a primary lens for focusing light in said projection light path onto an image plane.

28. The optical system of claim 27, comprising:

a lens turret disposed in said projection light path, said lens turret comprising;

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

a spherical lens in at least one of said turret apertures.

29. The optical system of claim 27, comprising:

a lens turret disposed in said projection light path, said lens turret comprising;

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

an anamorphic lens in at least one of said turret apertures.

30. The optical system of claim 27, wherein said primary lens is fixed relative to said optical system, comprising:

a lens turret disposed in said projection light path, said lens turret comprising;

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

a spherical lens in at least one of said turret apertures.

31. The optical system of claim 27, wherein said primary lens is fixed relative to said optical system, comprising:

a lens turret disposed in said projection light path, said lens turret comprising;

a lens holder;

at least two turret apertures in said lens holder, said lens holder operable to position each of said at least two turret apertures in said projection light path; and

an anamorphic lens in at least one of said turret apertures.