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StereoBright ™

StereoBright ™. Innovative technology from Advanced Visual Solutions (Patent Pending). Ver. 1.02. Advantages. Create large stereoscopic images by using two commercial mini-projectors Obtain twice the amount of light compared to conventional systems

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StereoBright ™

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  1. StereoBright™ Innovative technology from Advanced Visual Solutions (Patent Pending) © Yitzhak Weissman Ver. 1.02

  2. Advantages • Create large stereoscopic images by using two commercial mini-projectors • Obtain twice the amount of light compared to conventional systems • Reduce cost, size, weight, noise and heat generation by half © Yitzhak Weissman

  3. Principle • Exploit the native polarization properties of LCD projectors to achieve near 100% optical efficiency © Yitzhak Weissman

  4. Polarization structure of LCD projector • Liquid-crystal image generators create linearly-polarized images • In modern commercial LCD projectors, the green component is polarized perpendicularly to the blue and the red components © Yitzhak Weissman

  5. Polarization structure of LCD projector (ctd.) © Yitzhak Weissman

  6. Prior-art generation of orthogonal images • Mount polarizers on both projection lenses • Polarizers are aligned at 45° to the polarization directions of the beam and at 90° to each other • Result: two orthogonal images with light intensity reduced by 50% © Yitzhak Weissman

  7. Prior-art generation of orthogonal images (ctd.) Projector beams incident on polarizers Orthogonally polarized beams with intensity reduced by 50% © Yitzhak Weissman

  8. Polarization-rotated beams Original polarizations Polarization states rotated by 45° Left eye view Right eye view © Yitzhak Weissman

  9. Viewing polarization-rotated beams • If the green content of the stereo pair is switched, each eye sees the correct image • Switching can be done either by hardware, or by a simple preprocessing of the content © Yitzhak Weissman

  10. Switching the green component by hardware © Yitzhak Weissman

  11. Switching the green component by preprocessing R left R right G left G right Original B left B right R left R right G right G left Processed B left B right © Yitzhak Weissman

  12. Manipulation of polarization • Polarization states can be manipulated with retardation films • Half-wavelength retardation films are used to rotate the state of polarization • Quarter-wavelength retardation films are used to convert linear polarization to circular polarization and vice-versa © Yitzhak Weissman

  13. StereoBright versus polarizing filters Polarizing filter StereoBright filter © Yitzhak Weissman

  14. Comments • Same method can be used to create circularly-polarized images • StereoBright does not offer any advantage when using DLP projectors, since their light is unpolarized © Yitzhak Weissman

  15. Summary • Smart utilization of native polarization properties of LCD projectors to achieve a stereoscopic image with nearly 100% optical efficiency • Allows the use of mini presentation projectors to create bright stereoscopic display • No extra cost and complexity © Yitzhak Weissman

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