Source: https://patents.google.com/patent/US9594298B2/en
Timestamp: 2018-11-17 05:24:26
Document Index: 356863727

Matched Legal Cases: ['application No. 60', 'application No. 60', 'application No. 60', 'application No. 10', 'application No. 10', 'application No. 2009', 'application No. 2009']

US9594298B2 - Polarization conversion systems for stereoscopic projection - Google Patents
Polarization conversion systems for stereoscopic projection Download PDF
US9594298B2
US9594298B2 US14485256 US201414485256A US9594298B2 US 9594298 B2 US9594298 B2 US 9594298B2 US 14485256 US14485256 US 14485256 US 201414485256 A US201414485256 A US 201414485256A US 9594298 B2 US9594298 B2 US 9594298B2
US14485256
US20150002819A1 (en )
This patent application is a continuation application of and claims priority to U.S. patent application Ser. No. 13/047,763, now U.S. Pat. No. 8,220,934, entitled “Polarization conversion system for stereoscopic projection”, filed Mar. 14, 2011, which is a continuation application of U.S. patent application Ser. No. 11/864,198, now U.S. Pat. No. 7,905,602, entitled “Polarization conversion system for stereoscopic projection”, filed Sep. 28, 2007, which relates and claims benefit of: (a) U.S. provisional patent application No. 60/827,657, entitled “Polarization Conversion System for Cinematic Projection,” filed Sep. 29, 2006; (b) U.S. provisional patent application No. 60/911,043, entitled “Polarization conversion system for 3-D projection,” filed Apr. 10, 2007; and (c) U.S. provisional patent application No. 60/950,652, entitled “Polarization conversion system for 3-D projection,” filed Jul. 19, 2007. All applications referenced above are herein incorporated by reference in their entirety.
In operation, light exits projection lens 722 toward PBS 712. P-polarized light passes through PBS 712 toward telephoto lens pair 740, then toward polarization switch 720. An optional cleanup polarizer 746 may be located between telephoto lens pair 740 and polarization switch 720 to further enhance contrast. The s-polarized light reflected by PBS 712 is directed toward fold mirror 716, where it reflects toward an achromatic rotator 714 that transforms the s-polarized light into p-polarized light, then it passes through an optional cleanup polarizer 746. Next, the p-polarized light from achromatic rotator 714 passes through polarization switch 720. In this configuration, the s-polarized light reflected by the PBS 716 is efficiently reflected, with polarization maintained by the fold mirror 716. This relaxes any want for polarization preservation from the fold path and maximizes brightness. An achromatic 90° rotator 714 (probably retarder stack based) can be used to convert light from the fold mirror to the orthogonal state. In order to eliminate P-reflection from the PBS 712, a clean up polarizer 746 is likely desirable. This preferably follows the achromatic rotator 714, thereby reducing polarization conversion efficiency as a factor in system level contrast.
As used herein, the term “cinematic projection” refers to the projection of images using front and/or rear projection techniques, and includes, but is not limited to, applications for cinema, home theatre, simulators, instrumentation, head-up displays,. and other projection environments where stereoscopic images are displayed.
a polarization beam splitter (PBS) operable to receive randomly-polarized image light bundles from a projector lens, and direct first image light bundles having a first state of polarization (SOP) along a first image light path, and direct second image light bundles having a second SOP along a second image light path;
a polarization rotator located on one of the first and second image light paths, the polarization rotator being operable to translate the first SOP to the second SOP;
a reflector located on the second image light path, the reflector operable to direct second image light bundles to substantially similar locations on a projection screen as the first image light bundles;
a polarization switch operable to receive first and second image light bundles from the first and second image light paths respectively, and to selectively translate the polarization states of both the first and second image light bundles to one of a first output SOP and a second output SOP; and
wherein the polarization switch comprises first and second polarization switch panels, the first polarization switch panel receiving image light from the first image light path, the second polarization switch panel being positioned after the reflector and receiving image light from the second image light path.
2. The polarization conversion system of claim 1, wherein the first and second polarization switch panels are positioned adjacent to each other and wherein they are positioned such that the first and second image light bundles do not overlap at either of the first and second polarization switch panels.
3. The polarization conversion system of claim 1, wherein the reflector comprises one of a curved surface reflector, a flat surface reflector, and a prism.
4. The polarization conversion system of claim 1, further comprising a distance adjusting element located on the first image light path, after the PBS.
5. The polarization conversion system of claim 4, wherein the distance adjusting element comprises a lens.
6. The polarization conversion system of claim 1, wherein the first output SOP is orthogonal to the second output SOP.
7. The polarization conversion system of claim 1, wherein the polarization switch selects between the first and the second output SOP in synchronization with transmission of an image frame by a projector.
8. The polarization conversion system of claim 1, wherein the PBS comprises a plate polarizer.
9. The polarization conversion system of claim 8, wherein the plate polarizer comprises a polarizer selected from the group of a wire grid polarizer, a polarization recycling film, and a multi-dielectric polarizer.
10. The polarization conversion system of claim 1, wherein the polarization rotator is an achromatic half-wave retarder.
11. The polarization conversion system of claim 1, further comprising an image adjustment element located on one of the first and second image light paths and operable to substantially overlap the images from the first and second light paths at a projection screen.
12. The polarization conversion system of claim 11, wherein the image adjustment element is operable to substantially overlap the images from the first and second image light paths by being mechanically decentered from its respective light path.
13. The polarization conversion system of claim 11, wherein the image adjustment element is operable to overlap the images from the first and second light paths within 1-4 pixels of each other.
14. A polarization conversion system comprising:
a polarization beam splitter (PBS) configured to receive randomly-polarized image light bundles from a projector lens, and direct first image light bundles having a first state of polarization (SOP) along a first image light path, and direct second image light bundles having a second SOP along a second image light path;
a polarization rotator, wherein the polarization rotator is located on the first image light path and operable to translate the first SOP to the second SOP, or the polarization rotator is located on the second image light path and operable to translate the second SOP to the first SOP;
a polarization switch operable to receive first and second image light bundles from the first and second image light paths respectively, and to selectively translate the polarization states of both of the first and second image light bundles to one of a first output SOP and a second output SOP, wherein the polarization switch comprises first and second polarization switch panels, the first polarization switch panel receiving light from the first image light path, and the second polarization switch panel receiving image light from the second image light path; and
a reflector element located on the second image light path,
wherein to direct the second image light path toward substantially similar locations on a projection screen as the first image light path, at least one of the following applies:
(i) the reflector element is tiltable;
(ii) the polarization beam splitter is tiltable; and
(iii) the polarization conversion system further includes a lens or element with optical power, wherein said lens or element with optical power can be mechanically decentered.
15. The polarization conversion system of claim 14, wherein the first output SOP is orthogonal to the second output SOP.
16. The polarization conversion system of claim 14, wherein the first and second polarization switch panels form a single panel that receives image light from the first image light path and the second image light path.
17. The polarization conversion system of claim 14, wherein the polarization switch comprises a circular polarization switch.
18. The polarization conversion system of claim 14, wherein the polarization switch comprises an achromatic linear polarization switch.
19. The polarization conversion system of claim 14, wherein the polarization rotator is a half-wave retarder operable to transform p-polarized light to s-polarized light, and is further operable to transform s-polarized light to p-polarized light.
20. The polarization conversion system of claim 14, wherein the reflector element comprises one of a curved surface reflector, a flat surface reflector, and a prism.
21. The polarization conversion system of claim 14, wherein the polarization switch is configured to select between the first and the second output state of polarization in synchronization with transmission of an image frame by a projector.
22. The polarization conversion system of claim 14, further comprising an astigmatism correction element located on one of the first and second image light paths.
23. The polarization conversion system of claim 22, wherein the astigmatism correction element is integrated into another optical element in the polarization conversion system.
24. The polarization conversion system of claim 14, further comprising an image adjustment element located on one of the first and second image light paths and operable to substantially overlap the images from the first and second light paths at a projection screen.
25. The polarization conversion system of claim 24, wherein the image adjustment element is operable to substantially overlap the images from the first and second image light paths by being mechanically decentered from its respective light path.
26. The polarization conversion system of claim 24, wherein the image adjustment element is operable to overlap the images from the first and second light paths within 1-4 pixels of each other.
27. A polarization conversion system comprising:
28. The polarization conversion system of claim 27, wherein the first and second polarization switch panels are positioned adjacent to each other and wherein they are positioned such that the first and second image light bundles do not overlap at either of the first and second polarization switch panels.
29. The polarization conversion system of claim 27, wherein the reflector comprises one of a curved surface reflector, a flat surface reflector, and a prism.
30. The polarization conversion system of claim 27, further comprising a distance adjusting element located on the first image light path, after the PBS.
31. The polarization conversion system of claim 30, wherein the distance adjusting element comprises a lens.
32. The polarization conversion system of claim 27, wherein the first output SOP is orthogonal to the second output SOP.
33. The polarization conversion system of claim 27, wherein the polarization switch selects between the first and the second output SOP in synchronization with transmission of an image frame by a projector.
34. The polarization conversion system of claim 27, wherein the PBS comprises a plate polarizer.
35. The polarization conversion system of claim 34, wherein the plate polarizer comprises a polarizer selected from the group of a wire grid polarizer, a polarization recycling film, and a multi-dielectric polarizer.
36. The polarization conversion system of claim 27, further comprising an astigmatism correction element located on one of the first and second image light paths.
37. The polarization conversion system of claim 36, wherein the astigmatism correction element is integrated into another optical element in the polarization conversion system.
38. The polarization conversion system of claim 27, further comprising an image adjustment element located on one of the first and second image light paths and operable to substantially overlap the images from the first and second light paths at a projection screen.
39. The polarization conversion system of claim 38, wherein the image adjustment element is operable to substantially overlap the images from the first and second image light paths by being mechanically decentered from its respective light path.
40. The polarization conversion system of claim 39, wherein the image adjustment element is operable to overlap the images from the first and second light paths within 1-4 pixels of each other.
41. A polarization conversion system comprising:
a polarization beam splitter (PBS) operable to receive randomly-polarized image light bundles from a projector lens, and direct first image light bundles in a p-polarization state along a first image light path, and direct second image light bundles in an s-polarization state along a second image light path;
a reflector element located on the second image light path, wherein the reflector element is operable to direct second image light bundles to substantially similar locations on a projection screen as the first image light bundles;
an achromatic linear polarization switch operable to receive first and second image light bundles from the first and second image light paths respectively, and to selectively translate the polarization states of both the first and second image light bundles to one of a p-polarization output state or an s-polarization output state; and
wherein the achromatic linear polarization switch comprises first and second polarization switch panels, the first polarization switch panel receiving image light from the first image light path, the second polarization switch panel being positioned after the reflector element and receiving image light from the second image light path.
42. The polarization conversion system of claim 41, wherein the reflector element is a fold mirror.
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US13550182 US8833943B2 (en) 2006-09-29 2012-07-16 Polarization conversion systems for stereoscopic projection
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