NJ5 said:
The glasses are actually a pair of LCD screens (1 pixel per eye). They alternately light up to block the current frame from one of the eyes, in order to let each eye only see even/odd frames. The glasses synchronize with the TV via an infrared signal (emitter needed, if not included in TV) in order to know the frame timing. They're called LCD shutter glasses.
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That is one method.
An alternative to active shutter glasses are polarized glasses that have lenses similar to those on sunglasses. The lenses have polarization that is adjusted to be orthogonal — set perpendicularly at 90-degree angles — to one another. The images are displayed orthogonal, and because each filter passes only the light that is similarly polarized and blocks the orthogonally polarized light, each eye sees only the image intended for it. The brain then puts these images together to create a three-dimensional effect.
There is also a couple of methods that don't require glasses, but have their own cons... mainly having a very small sweet spot of where you can properly view the image from...
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