`
`ATTORNEY DOCKET NO: 229501
`
`CLAIMS
`
`A polarization conversion system comprising:
`
`a polarization beam splitter (PB S) operable to receive randomly-polarized light
`
`bundles from a projector lens, and direct first light bundles having a first state of
`
`polarization (SOP) along a first light path, and direct second light bundles having a
`
`second SOP along a second light path,
`
`a polarization rotator located on the first light path, the polarization rotator being
`
`operable to translate the first SOP to the second SOP,
`
`a polarization switch operable to receive first and second light bundles from the
`
`first and second light paths respectively, and to selectively translate the polarization
`
`states of the first and second 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 light from the first light path, and
`
`the second polarization switch panel receiving light from the second light path.
`
`The polarization conversion system of claim 1, further comprising a reflector located
`
`on the second light path, operable to direct second light bundles to substantially
`
`similar locations on a projection screen as the first light bundles.
`
`The polarization conversion system of claim 2, wherein the reflector comprises one of
`
`a curved surface reflector, a flat surface reflector, and a prism.
`
`The polarization conversion system of claim 1, further comprising a distance
`
`adjusting element located on the first light path, after the PBS.
`
`The polarization conversion system of claim 4, wherein the distance adjusting
`
`element comprises a lens.
`
`12
`
`
`
`UTILITY PATENT APPLICATION
`
`ATTORNEY DOCKET NO: 229501
`
`The polarization conversion system of claim 1, wherein the first output SOP is
`
`orthogonal to the second output SOP.
`
`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.
`
`10.
`
`ll.
`
`The polarization conversion system of claim 1, wherein the PBS comprises a plate
`
`polarizer.
`
`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.
`
`The polarization conversion system of claim 1, wherein the polarization rotator is an
`
`achromatic half-wave retarder.
`
`A projection system utilizing polarized light for encoding stereoscopic imagery from
`
`a projector having a projection lens operable to output randomly-polarized light,
`
`comprising:
`
`a polarization conversion system optically coupled to the projection lens,
`
`comprising:
`
`a polarization beam splitter operable to direct light on first and second
`
`light paths,
`
`a polarization rotation element located on the first_light path,
`
`a reflector element located on the second light path, and
`
`a polarization switch located on the first light path and on the second light
`
`path, wherein the first light path forms an image on a projection screen, and wherein
`
`the reflector element directs light on the second light path toward the projection
`
`screen.
`
`13
`
`
`
`UTILITY PATENT APPLICATION
`
`ATTORNEY DOCKET NO: 229501
`
`12. A polarization conversion system comprising:
`
`a polarization beam splitter (PBS) configured to receive randomly-polarized light
`
`bundles from a projector lens, and direct first light bundles having a first state of
`
`polarization (SOP) along a first light path, and direct second light bundles having a
`
`second SOP along a second light path,
`
`a polarization rotator, wherein the polarization rotator is located on the first light
`
`path and operable to translate the first SOP to the second SOP, or the polarization rotator
`
`is located on the second light path and operable to translate the second SOP to the first
`
`SOP'
`
`a polarization switch operable to receive first and second light bundles from the
`
`first and second light paths respectively, and to selectively translate the polarization states
`
`of the first and second light bundles to one of a first output SOP and a second output
`
`SOP, and
`
`a reflector element located on the second light path,
`
`wherein to direct the second light path toward substantially similar locations on a
`
`projection screen as the first light path, at least one of the following applies:
`
`(i)
`
`(ii)
`
`the reflector element is tiltable,
`
`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.
`
`13. The polarization conversion system of claim 12, wherein the first output SOP is
`
`orthogonal to the second output SOP.
`
`14. The polarization conversion system of claim 12, wherein the polarization switch
`
`comprises a single panel that receives light from the first light path and the second
`
`light path.
`
`14
`
`
`
`UTILITY PATENT APPLICATION
`
`ATTORNEY DOCKET NO: 229501
`
`15.
`
`The polarization conversion system of claim 12, wherein the polarization switch
`
`comprises first and second polarization switch panels, the first polarization switch
`
`panel receiving light from the first light path, and the second polarization switch
`
`panel receiving light from the second light path.
`
`16.
`
`17.
`
`18.
`
`19.
`
`20.
`
`The polarization conversion system of claim 12, wherein the polarization switch
`
`comprises a circular polarization switch.
`
`The polarization conversion system of claim 12, wherein the polarization switch
`
`comprises an achromatic linear polarization switch.
`
`The polarization conversion system of claim 12, 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.
`
`The polarization conversion system of claim 12, wherein the reflector element
`
`comprises one of a curved surface reflector, a flat surface reflector, and a prism.
`
`The polarization conversion system of claim 12, 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.
`
`15
`
`
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