Distortion matching polarization conversion systems and methods thereof
First Claim
1. An optical system, comprising:
- at least one polarization beam splitter (PBS) operable to receive randomly-polarized light bundles from a projector lens, further operable to direct first light bundles having a first state of polarization (SOP) along a first light path having a first optical path length to produce a first image having a first non-compensated distortion, further operable to direct second light bundles having a second SOP along a second light path having a second optical path length to produce a second image having a second distortion, and further operable to direct third light bundles having the first SOP along a third light path having a third optical path length to produce a third image having a third non-compensated distortion, the first non-compensated distortion and the second distortion having differing amounts of trapezoidal distortion;
a compensation in the first light path, the compensation operable to convert the first non-compensated distortion into a first compensated distortion, the first compensated distortion more closely matching the second distortion than the first non-compensated distortion;
a second compensation in the third light path, the second compensation operable to convert the third non-compensated distortion into a third compensated distortion, the third compensated distortion more closely matching the second distortion than the third non-compensated distortion; and
a first half-lens pair in the first light path and a second half-lens pair in the third light path, wherein the compensation creates a vertical tilt in at least one of the half-lenses in the first half-lens pair, and wherein the second compensation creates a vertical tilt in at least one of the half-lenses in the second half-lens pair.
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Abstract
Optical systems having at least one polarization beam splitter (PBS) are operable to receive randomly-polarized light bundles from a projector lens. The PBS is further operable to direct light bundles having a state of polarization (SOP) along a light path and operable to direct other light bundles having a different SOP along different light paths. The light paths have optical path lengths which may differ. Each light path produces an image having a distortion which may differ from the distortion of an image produced by a different light path. A compensation in a light path is operable to convert a non-compensated distortion of an image into a compensated distortion that more closely matches the distortion of images in other light paths.
308 Citations
12 Claims
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1. An optical system, comprising:
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at least one polarization beam splitter (PBS) operable to receive randomly-polarized light bundles from a projector lens, further operable to direct first light bundles having a first state of polarization (SOP) along a first light path having a first optical path length to produce a first image having a first non-compensated distortion, further operable to direct second light bundles having a second SOP along a second light path having a second optical path length to produce a second image having a second distortion, and further operable to direct third light bundles having the first SOP along a third light path having a third optical path length to produce a third image having a third non-compensated distortion, the first non-compensated distortion and the second distortion having differing amounts of trapezoidal distortion; a compensation in the first light path, the compensation operable to convert the first non-compensated distortion into a first compensated distortion, the first compensated distortion more closely matching the second distortion than the first non-compensated distortion; a second compensation in the third light path, the second compensation operable to convert the third non-compensated distortion into a third compensated distortion, the third compensated distortion more closely matching the second distortion than the third non-compensated distortion; and a first half-lens pair in the first light path and a second half-lens pair in the third light path, wherein the compensation creates a vertical tilt in at least one of the half-lenses in the first half-lens pair, and wherein the second compensation creates a vertical tilt in at least one of the half-lenses in the second half-lens pair. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification