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Passive 3D filter and glasses system
There are two passive 3D glasses and filter systems.
1. Polarized system: the filter and glasses are cheaper and silver screen is required. LCD/LCOS/Laser projector shall use linear polarized system and DLP projector can use both linear and circular polarized system. The filter, glasses and screen will determined the crosstalk and 3D effect. These three items shall match together to get the best video quality.
2. Band-pass (spectrum) filter and glasses system: it is similar to Infetec and Dolby 3D system. The price for this kind of filter and glasses is about 10x compared with polarized system. user can use conventioanl 2D screen. If correctly setup, Band-pass filter can have better R/L contrast with less crosstalk. 
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