Polarized light reflected from an ordinary motion picture screen typically loses most of its polarization, but the loss is negligible if a silver screen or aluminized screen is used. System construction and examples įunctional principle of polarized 3D systems Rotating both the QWP and the LPF by the same angle does not change the behaviour of the analyzing filter. parallel to the direction of propagation of the light wave), one may build an analyzing filter which blocks left-handed, rather than right-handed circularly polarized light. In contrast, right-handed circularly polarized light would have been transformed into linearly polarized light that had its direction of polarization along the absorbing axis of the LPF, which is at right angles to the transmission axis, and it would have therefore been blocked.īy rotating either the QWP or the LPF by 90 degrees about an axis perpendicular to its surface (i.e. Therefore, in this case the light passes through the LPF. In the illustration, the left-handed circularly polarized light entering the analyzing filter is transformed by the QWP into linearly polarized light which has its direction of polarization along the transmission axis of the LPF. However, the angle of polarization of the linearly polarized light produced by a QWP depends on the handedness of the circularly polarized light entering the QWP. The QWP always transforms circularly polarized light into linearly polarized light. This can make prolonged viewing uncomfortable as head movement is limited to maintain the 3D effect.Ĭircular polarizer passing left-handed, counter-clockwise circularly polarized lightĪs shown in the figure, the analyzing filters are constructed of a quarter-wave plate (QWP) and a linearly polarized filter (LPF). Linearly polarised glasses require the viewer to keep his or her head level, as tilting of the viewing filters will cause the images of the left and right channels to bleed over to the opposite channel. As each filter only passes light which is similarly polarised and blocks the orthogonally polarized light, each eye only sees one of the projected images, and the 3D effect is achieved. The viewer wears linearly polarized eyeglasses which also contain a pair of orthogonal polarizing filters oriented the same as the projector. To present a stereoscopic motion picture, two images are projected superimposed onto the same screen through orthogonal polarizing filters (Usually at 45 and 135 degrees). Polarized 3D systems, and stereoscopy systems in general, commonly exhibit the Vergence-Accommodation Conflict. Multiple people can view the stereoscopic images at the same time. This is used to produce a three-dimensional effect by projecting the same scene into both eyes, but depicted from slightly different perspectives with different polarizations. The left and right filters have different polarizations, so each eye receives only the image with the matching polarization. The viewer wears low-cost eyeglasses with a polarizing filter for each eye. To present stereoscopic images and films, two images are projected superimposed onto the same screen or display through different polarizing filters. Circularly polarized 3D glasses in front of an LCD (Liquid Crystal Display) tablet with a quarter-wave retarder on top of it the λ/4 plate at 45° produces a definite handedness, which is transmitted by the left filter but blocked by the right filter.Ī polarized 3D system uses polarization glasses to create the illusion of three-dimensional images by restricting the light that reaches each eye (an example of stereoscopy).
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