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Topic: RealD's new extra light system..
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Julio Roberto
Jedi Master Film Handler
Posts: 938
From: Madrid, Madrid, Spain
Registered: Oct 2008
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posted 03-15-2009 08:49 AM
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=4382351&isnumber=4382237
That would be a good paper on the technology I was talking about.
I doubt RealD used a light recovery box, but if they did, that would be the "easy" way out.
It's easy to separate light "50/50" based on its polarization with, i.e., a wire grid polarizer, by reflecting the half that is in one direction and allowing the other half to pass through.
Then you can rotate the half you reflected with a wave plate and make it go through the optical path again. That way you get "100%" of the light polarized in one state going through the path you wanted.
Sort of.
Here is a link to RealD patent abstract for such an implementation:
http://www.faqs.org/patents/app/20080225236
quote:
A polarization conversion system (PCS) is located in the output light path of a projector. The PCS may include a polarizing beam splitter, a polarization rotating element, a reflecting element, and a polarization switch. Typically, a projector outputs randomly-polarized light. This light is input to the PCS, in which the PCS separates p-polarized light and s-polarized light at the polarizing beam splitter. P-polarized light is directed toward the polarization switch on a first path. The s-polarized light is passed on a second path through the polarization rotating element (e.g., a half-wave plate), thereby transforming it to p-polarized light. A reflecting element directs the transformed polarized light (now p-polarized) along the second path toward the polarization switch. The first and second light paths are ultimately directed toward a projection screen to collectively form a brighter screen image in cinematic applications utilizing polarized light for three-dimensional viewing.
http://www.google.com/patents?id=9psOAAAAEBAJ
[link is to another patent for basically the same thing made a few years earlier than Colorlinks/RealD's]
[ 03-15-2009, 06:52 PM: Message edited by: Julio Roberto ]
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