This thread is about 3D. Several off-topic posts have been deleted.
Actually, LCD shutter glasses are polarised, as a side effect of using LCD technology (but this does not contribute to how they produce the 3D effect). LCD based TVs also contain polarising filters. This is why the image darkens when you tilt LCD shutter glasses off horizontal in combination with an LCD TV.No shutter glasses is polarized, however.
The Real3D glasses, currently used for most recent 3D movies in theatres, use circular polarisers. They don't darken when tilted sideways.But yeah, a polarized glasses should darkened when tilted sideways.