♤ Passive 3D:

♤ To present stereoscopic images and films, two images are projected superimposed onto the same screen or display through different polarizing filters. The viewer wears low-cost eyeglasses which contain a pair of different polarizing filters. As each filter passes only that light which is similarly polarized and blocks the light polarized in the opposite direction, each eye sees a different image.

♤ Without lenses: Autostereoscopic displays, sometimes referred to commercially as Auto 3D.