Patent
Polarizing light pipe
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TLDR
A recirculating light polarizer as discussed by the authors utilizes a reflective polarizer on the exit face of a light integrator, such as a light pipe or light tunnel, to enhance the light output from the light pipe assembly with some light being lost in each cycle due to various loss mechanisms.Abstract:
A recirculating light polarizer utilizes a reflective polarizer on the exit face of a light integrator, such as a light pipe or light tunnel. Light is provided to the light integrator and light of one polarization is transmitted through the polarizer, the remaining light being reflected back into the integrator. The back-reflected light accumulates polarization shift before it eventually is reflected back to the polarizer. The reflected light is further homogenized on its trip back to the polarizer. This process is typically repeated several times to enhance the light output from the light pipe assembly, with some light being lost in each cycle due to various loss mechanisms. A polarization state modifier, such as a retarder plate or phase-shifting coatings, may be included in the recirculating light path to enhance polarization shift.read more
Citations
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References
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Patent
Polarizer apparatus for producing a generally polarized beam of light
Douglas P. Hansen,John Gunther +1 more
TL;DR: In this paper, a polarizing system having a light source (23) and a polarising device (10) is described, where the polarizing device is disposed in an unpolarized source light beam for transmitting a transmitted light beam (24) having a first polarization and reflecting a reflected light beam having a second polarization.
Patent
Light-source device and projection type display device
TL;DR: In this article, a light source device comprising a rod integrator having an injection end and an emitting end, a lens unit for collecting a luminous flux emitted from the emitting end; and, a diaphragm was disposed in the vicinity of a plane on which the lens unit formed the images of the imaginary light-source points.
Patent
Illuminating apparatus and projecting apparatus
TL;DR: In this paper, an inner surface reflection type integrator, a condensing optical system for condensing light from a light source on or near the light incidence portion of the integrator is described.
Patent
Single panel color projection video display having improved scanning
TL;DR: In this article, a color video projection video system is described, where a white light source is separated into red, green and blue bands with dark guard bands spaced there between. But the color balance can be adjusted by changing the relative size of each color band with respect to the others.
Patent
Polarization recovery system for projection displays
TL;DR: A waveguide polarization recovery system as mentioned in this paper polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD.