Alain <kua### [at] videotronca> wrote:

> The 3D glasses used for colour movies normaly use polarised glasses,
> vertical polarisation on one side, horizontal for the other.
> The projectors also have coresponding polaroid filters.

There appear to be different technologies out there, but state of the art
actually is not horizontal and vertical polarization, but left-handed and
right-handed circular polarization -- the advantage being that you don't need to
keep your head exactly level.

This is often also combined with a slight red/cyan tint.


> 3D TV and monitors use alternating right-left images and you need
> special switching glasses to get the 3D effect. Special care must be
> given to the synchronisation between the screen and the glasses, usualy
> provided through a bluetoot signal.

There /are/ also displays out there that use polarization filters.

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