3D Circular Glasses Or Linear Glasses?
First lets understand how light moves. Light travels as light waves always moving forward from the light source. In a HDTV set the light waves will be moving towards you from the TV, if you use a 3D projector the light will be moving over your head from the projector to the silver screen and then back to you as a viewer. Light waves have different ways to travel, oscillating in lots of directions. Polarization cuts out the oscillation of the light waves in some directions, leaving light waves that are oscillating more uniformly.
There are two types of polarization that are relevant to 3D TV: linear polarization and circular polarization.
What is 3D Linear Glasses?
linearly polarized light filter (linear glasses) makes sure that the light waves coming towards your eyes and passes through, are oscillating in one direction only. Some of the light waves are filtered and this reduces the intensity of the light, (that’s why 3D images seems darker) this linear filtering doesn’t limit the colors that can pass through, which is good for 3D TV.
when watching a 3D movie with Linearly polarized glasses, the viewer must need to keep his head level, as tilting of the viewing filters will cause the two images (left and right) to spill over to the opposite channel. This can make prolonged viewing uncomfortable as head movement is limited to maintain the 3D effect.
What is 3D Circular Glasses?
Circular polarization is more complicated to explain and to understand.. To present a stereoscopic motion picture, 2 pictures are projected superimposed onto the same screen through orthogonal polarizing filters. The viewer wears low-cost glasses which also contain 2 orthogonal polarizing filters.
Because those filter passes only that light which is in a similar way polarized and blocks the orthogonally polarized light, each eye sees only its separately polarized image, manufacturing a 3-dimensional effect. This is used to produce a three-dimensional effect by projecting the same scene into both eyes, but depicted from slightly different perspectives. Since no head tracking is involved, several people can view the stereoscopic images at the same time.
What are the best 3D Glasses?
It seems that the circular 3D polarized glasses are better for viewing the 3D effects, they allow you as the spectator to tilt your head more freely, and allows you when watching the 3D movie at home to sit in a wider angle to the HDTV and still enjoy the 3D effects. The Linear 3D glasses are cheaper to buy but they are limited to the 3D effect and entertainment they you can have with them. Today most of the HDTV sets are 3D capable display, some of the new 3D TVs have the new shutter 3D glasses technology which brings the 3D effects and viewing to a different dimension.
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