Polarization conversion system and method for projecting polarization encoded imagery
First Claim
1. A polarization conversion system for transmitting polarization encoded images to a projection screen, comprising:
- a first projection lens;
a second projection lens;
a polarization beam splitter operable to transmit light of a first polarization state toward the first projection lens on a first light path, and operable to reflect light of a second polarization state toward a second light path;
a reflecting element located on the second light path operable to reflect light toward the second projection lens; and
a polarization modulator located in the first and second light paths and operable to rotate the polarization of light passing therethrough to provide first and second output polarization states;
wherein the first and second projection lenses are operable to direct the polarization encoded images toward the projection screen;
wherein the polarization conversion system is positioned between an image source and the projection screen; and
wherein the polarization modulator comprises a liquid crystal based modulator.
11 Assignments
0 Petitions
Accused Products
Abstract
A polarization conversion system separates light from an unpolarized image source into a first state of polarization (SOP) and an orthogonal second SOP, and directs the polarized light on first and second light paths. The SOP of light on only one of the light paths is transformed to an orthogonal state such that both light paths have the same SOP. A polarization modulator temporally modulates the light on the first and second light paths to first and second output states of polarization. First and second projection lenses direct light on the first and second light paths toward a projection screen to form substantially overlapping polarization encoded images. The polarization modulator may be located before or after the projection lenses. The polarization-encoded images may be viewed using eyewear with appropriate polarization filters.
28 Citations
22 Claims
-
1. A polarization conversion system for transmitting polarization encoded images to a projection screen, comprising:
-
a first projection lens; a second projection lens; a polarization beam splitter operable to transmit light of a first polarization state toward the first projection lens on a first light path, and operable to reflect light of a second polarization state toward a second light path; a reflecting element located on the second light path operable to reflect light toward the second projection lens; and a polarization modulator located in the first and second light paths and operable to rotate the polarization of light passing therethrough to provide first and second output polarization states; wherein the first and second projection lenses are operable to direct the polarization encoded images toward the projection screen; wherein the polarization conversion system is positioned between an image source and the projection screen; and wherein the polarization modulator comprises a liquid crystal based modulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method for projecting polarization-encoded images, comprising:
-
receiving image source light from a projection panel at a polarization beam splitter; transmitting image source light of a first polarization state at the polarization beam splitter toward a projection lens located on a first light path; reflecting image source light of a second polarization state at the polarization beam splitter toward a second light path; reflecting the image source light of a second polarization state toward a second projection lens; converting the state of polarization of light of one of the first and second light paths to an orthogonal state of polarization; and modulating the state of polarization of the light on at least one of the first and second light paths to provide first and second output polarization states; wherein modulating the state of polarization of the light comprises applying a modulated voltage to a liquid crystal based modulator. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
-
Specification