[photo-3d] Re: polarisers in video projection

[CanterMike@xxxxxxx]

In New Digest 35, Sergio Baldissara writes, in part:

<< if you own a TV/PC projector, you can't use method 1 to
 project  the images (movies) you got by method 2: LCD projectors already
 polarize light by themselves... >>

Some of you may remember the short National Geographic underwater 3D video 
projected at NSA/Richmond, '98.  When I first saw it (at a PSSP club meeting 
some months before) I had a brief opportunity to speak with the presenters 
from NGS.  They used two synchronised video projectors with polarisers over 
the lenses.  I was astonished as I, too, had thought it impractiable.  The 
gentleman I spoke to though it no big deal.  "Circular polarisers", he said.  
Perhaps the quarter wave plate makes this possible?  I have had no access to 
a video projector to be able to experiment.

I know that there are different video projection technologies available, but 
what else besides CRT & LCD?  Wasn't TI working on something a few years ago? 
 Something about micro mirrors?  My memory escapes me....

Mike Canter


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