Polarization Conversion System Technical Details

SPECIFICATIONS

  • Net Transmittance: 80%
  • Diffuser Region Efficiency: ~90%
  • Thickness:
    • Static: <0.5mm
    • Dynamic < 2mm
  • Smallest Grating Period: <2um at edge of diffusion GPLs
  • Dynamic diffusers
    • Typical LC switching speed: ~2.5 ms 
  • Size: Up to 300 x 300mm sq
    • Round or arbitrary cut samples are custom
  • Patterning: Any lens/array shape possible
  • Larger custom sizes are available with additional NRE

BENEFITS

Because of their radically different fabrication, GPL diffusers offer:

  • Both static and dynamic operation
  • High efficiency
  • Can be integrated/laminated with other components
  • Both narrow and wide diffusion angles are possible
  • Dynamic diffusers switch at typical LC switching times
  • Can work with any input polarization

Additional Information

The PCS was originally designed to enable the world’s smallest, lowest cost and most efficient pico-projectors and for edge-lit and direct-lit backlight units. The GPH film combines the features of a microlens array and a PG film. A typical PCS feature is a completely flat outer surface and an extraordinarily thin design, making the PCS ideal for inclusion in stacks of closely fitted optical elements. Microlens arrays both split the light based on polarization and provide homogenization of the output light for added color and brightness uniformity. These act similarly to a Fly-Eye-Lens.

  • High efficiency
  • Ultra-thin, flat component
  • Less alignment required
  • Easy fabrication
  • Cost-effective

The following design spec of the optical components and the spacing were determined by the TracePro simulation.

PCS Trace Pro
polar Iso-Candela Plot

Performance Summary

  • Zemax modeling
  • Ideal conversion efficiency 81%(from unpolarized to linear polarized, RGB)
  • Estimated prototype efficiency 75%
  • 1.5 mm thick, arbitrary area
  • Design parameters can be optimized for specific system
PCS Performance Chart

FAQs

Is it possible to recover and use the lost polarization in our optical system?

Yes. Our PCS technology is designed for this type of recovery.
In the direction of diffraction, it will double the output angle and double the etendue of the system.
No. This is because the PCS changes ray angles and will introduce aberrations and significant scatter to the output.
This is possible, but if the increase in angle is not accounted for in the optical design, the performance will be significantly lower than expected. In general, we recommend that the PCS is designed at the same time as the rest of the optics to ensure excellent performance.

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