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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

StereoBright™

Innovative technology from Advanced Visual Solutions (Patent Pending)

© Yitzhak Weissman

Ver. 1.02

advantages
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

principle
Principle
  • Exploit the native polarization properties of LCD projectors to achieve near 100% optical efficiency

© Yitzhak Weissman

polarization structure of lcd projector
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

prior art generation of orthogonal images
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

prior art generation of orthogonal images ctd
Prior-art generation of orthogonal images (ctd.)

Projector beams incident on polarizers

Orthogonally polarized beams with intensity reduced by 50%

© Yitzhak Weissman

polarization rotated beams
Polarization-rotated beams

Original polarizations

Polarization states rotated by 45°

Left eye view

Right eye view

© Yitzhak Weissman

viewing polarization rotated beams
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

switching the green component by preprocessing
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

manipulation of polarization
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

stereobright versus polarizing filters
StereoBright versus polarizing filters

Polarizing filter

StereoBright filter

© Yitzhak Weissman

comments
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

summary
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