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Author Topic: 3D polarizers from China Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 12-20-2013 08:24 AM                     Has anyone else been contacted by these guys http://www.qpx-tech.com/html-en/product-epUKgRBGZVCc-Only-8KG-%26-US%243800%2FSET-Cinema-Passive-REALD- 3D-Polarized-Modulator-for-Cinema.html? I have my doubts that Real-D will smile on an installation with it, but is there any actual patent protection for their system? Electrically switched liquid crystal polarizers have been around for quite a while, and is how LCD displays work. These guys using the "Real-D" name seems a bit off anyway.  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 12-20-2013 11:58 AM                     RealD might have some patents on their particular implementation, but the basic technology behind the ZScreen has been around for ages and many viable patents expired some time ago. The XPand3D Passive system for example, uses an assembly not unlike the RealD ZScreen. Still, that doesn't allow them to use the RealD trademark as they please. But then again, Chinese manufacturers don't give a damn about patents or trademarks anyway.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 12-20-2013 02:59 PM                     The guys putting up that page probably do not know the difference between a technical term and a brand name. I can't count these Z-Screen clones anymore - without any patent issues, 4 systems with the same functionality as RealD Z-Screen are available in europe - Depth-Q, Volfoni Smart Crystal Cinema, XPAND Passive Modulator, MasterImage Wave3D. And these are only the systems actively sold/supported by major european integrators. Volfoni even have their own variant of the RealD Z-Screen XL system - the Smart Crystal Diamond: http://diamond.volfoni.com/ - Carsten  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 12-23-2013 11:02 AM                     And here we add to the confusion. There's no such thing as a "Z-Screen XL." You have either a Z-Screen OR an XL.  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 12-23-2013 11:15 AM                     Its just another half-baked cheap knockoff from China. What really caught my attention on the page was that they claim it is 19%. If it is really only 19% efficient, then they are probably being honest about it, but then again if it is only 19% efficient, then that's freakin' awful.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-23-2013 08:37 PM                     I seriously doubt it even has coated optical windows like the Real-D stuff does. The efficiency depends on the transmissivity of the filters. There are actually meters that can accurately measure that and I happen to have one I use to test port glass. So if anyone has one of these I can make meaningful measurements for you. Still... if they would send you one to try to your satisfaction I would at least try it. If they want your $$ up front then steer clear. Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-24-2013 06:32 AM                     19% compared to a Real-D Z-screen is actually a little better...which is only about 15% transmissive. The question is...where did the number come from and who has verified it? People can say most anything they want...backing it up is another matter. After all, who has the BEST projector? Just ask em!  |  IP: Logged

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