Display apparatus using LCD panel

• US 7,188,953 B2
• Filed: 05/03/2005
• Issued: 03/13/2007
• Est. Priority Date: 05/03/2005
• Status: Expired due to Fees

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Silverstein, Barry D., Cobb, Joshua M.
• Primary Examiner(s): Koval; Melissa J.
• Application Number:
  US11/120,340
• Publication Number:
  US 20060250580A1
• Time in Patent Office: 679 Days
• Field of Search: 353/20, 353/94, 353/102, 349/9
• US Class Current: 353/20
• CPC Class Codes: H04N 9/315 Modulator illumination systems general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20
• CPC Class Codes: H04N 9/3164 using multiple light sources
• CPC Class Codes: H04N 9/3167 for polarizing the light beam polarizing optical systems per se G02B27/28
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A projection apparatus has an illumination section that provides first, second, and third light sources for providing first, second, and third illumination beams. First, second, and third component wavelength modulating sections modulate the corresponding illumination to provide first, second, or third modulated component wavelength beams respectively. Each component wavelength modulating section uses a portion of a monochrome transmissive liquid crystal modulator panel that has been segmented into at least a first, second, and third portion. A component wavelength polarizer in the path of the component wavelength illumination directs substantially polarized light to the corresponding portion of the monochrome transmissive liquid crystal modulator panel. An illumination path Fresnel lens focuses incident illumination from the component wavelength polarizer through the corresponding portion of the monochrome transmissive liquid crystal modulator panel. An analyzer conditions the polarization of the modulated component wavelength beam. A lens forms an image for projection onto a surface.

Claims

1. A projection apparatus comprising:

a) an illumination section comprising;

i) a first light source for providing a first illumination beam;

ii) a second light source for providing a second illumination beam;

iii) a third light source for providing a third illumination beam;

b) first, second, and third component wavelength modulating sections, each component wavelength modulating section accepting the corresponding first, second, or third wavelength illumination and modulating the corresponding wavelength illumination to provide a first, second, or third modulated component wavelength beam respectively, each component wavelength modulating section comprising;

i) a portion of a monochrome transmissive liquid crystal modulator panel that has been segmented into at least a first portion, a second portion, and a third portion, and wherein each portion is spatially separated from each other portion;

ii) a component wavelength polarizer in the path of the component wavelength illumination for directing substantially polarized light to the corresponding portion of the monochrome transmissive liquid crystal modulator panel;

iii) an illumination path Fresnel lens for focusing incident illumination from the component wavelength polarizer through the corresponding portion of the monochrome transmissive liquid crystal modulator panel;

iv) an analyzer for conditioning the polarization of the modulated component wavelength beam;

v) a lens for forming an image for projection onto a display surface; and

whereby the image formed on the display surface comprises a plurality of superimposed component wavelength beams.

2. A projection apparatus according to claim 1 wherein the light source is a laser.

3. A projection apparatus according to claim 1 wherein the light source is a light emitting diode (LED).

4. A projection apparatus according to claim 1 wherein the transmissive liquid crystal modulator comprises thin film transistors.

5. A projection apparatus according to claim 1 wherein at least one component wavelength polarizer is spaced apart from the monochrome transmissive liquid crystal modulator panel.

6. A projection apparatus according to claim 1 wherein at least one analyzer is a wire grid polarizer device.

7. A projection apparatus according to claim 6 wherein the thin film transistors are organic thin film transistors.

8. A projection apparatus according to claim 6 wherein the thin film transistors comprise carbon nanotubes.

9. A projection apparatus according to claim 6 wherein the wire surface side of the wire grid polarizer device is oriented toward the liquid crystal modulator panel.

10. A projection apparatus according to claim 1 wherein at least one component wavelength polarizer is a wire grid polarizer device.

11. A projection apparatus according to claim 10 wherein the wire surface side of the wire grid polarizer device is oriented toward the liquid crystal modulator panel.

12. A projection apparatus according to claim 1 wherein at least one illumination path Fresnel lens is spaced apart from the monochrome transmissive liquid crystal modulator panel.

13. A projection apparatus according to claim 1 further comprising

a) a sensor for detecting an offset between the plurality of superimposed component wavelength beams;

and

b) an imaging control processor for shifting the position of at least one of the first or second portions on the monochrome transmissive liquid crystal modulator to compensate for the offset.

14. A projection apparatus according to claim 1 further comprising

a) a sensor for detecting an offset between the plurality of superimposed component wavelength beams;

and

b) an actuator coupled with at least one projection lens for adjusting lens position to compensate for the offset.

15. A projection apparatus according to claim 1 wherein at least one of the component wavelength modulating sections further comprises a modulated beam Fresnel lens.

16. A projection apparatus according to claim 15 wherein the modulated beam Fresnel lens is glass.

17. A projection apparatus according to claim 15 wherein the modulated beam Fresnel lens comprises crossed cylindrical Fresnel lenses.

18. A projection apparatus according to claim 1 wherein at least one of the component wavelength modulating sections further comprises a modulated beam Fresnel lens, wherein the modulated beam Fresnel lens comprises crossed cylindrical Fresnel lenses.

19. A projection apparatus according to claim 1 wherein at least one of the modulated beam Fresnel lenses is glass.

20. A projection apparatus according to claim 1 wherein the analyzer in at least one component wavelength modulating section comprises a wire grid polarization beamsplitter.

21. A projection apparatus according to claim 1 wherein the illumination section further comprises a shutter.

22. A projection apparatus according to claim 1 further comprising a compensator.

23. A projection apparatus according to claim 22 wherein the compensator is placed between the modulator panel and the at least one component wavelength polarizer.

24. A projection apparatus according to claim 22 wherein the compensator is a film-based component.

25. A projection apparatus according to claim 22 wherein the compensator is a multi-dielectric thin film stack based component.

26. A projection apparatus according to claim 22 wherein the compensator is in the path of the first component wavelength illumination.

27. A projection apparatus according to claim 22 wherein the compensator is in the path of a modulated component wavelength beam.

28. A projection apparatus according to claim 1 wherein the analyzer is spaced apart from the liquid crystal modulator panel.

29. A projection apparatus according to claim 1 wherein at least one analyzer is a reflective polarizing beamsplitter.

30. A projection apparatus according to claim 1 wherein the illumination path Fresnel lens is glass.

31. A projection apparatus according to claim 22 wherein the compensator comprises a formed birefringent structure.

32. A projection apparatus according to claim 1 wherein the first, second, and third component wavelength modulating sections form an intermediate image for projection by a projection lens.

33. A projection apparatus according to claim 1 wherein the monochrome transmissive liquid crystal modulator panel has a first antireflection coating on a first surface and a second antireflection coating on a second surface.