Old School or New? In Search of the Best 3D Glasses
The advent of 3D technology in theaters heralded a rush among television and DVD manufacturers to bring that same quality viewing experience into the home. Since 3D viewing still depends upon the viewer wearing glasses to create the experience, it's good to know what kinds of 3D glasses available for home theater use will render the best 3D imagery.
Briefly, 3D technology creates the illusion of depth by recreating the same kind of stereoscopic vision we have outside the theater. Each of our eyes observes the same thing, but because they are a small distance apart they see that thing from just a slightly different angle, or perspective. Our brains then put the imagery together, allowing us to perceive depth, the third dimension. In order to recreate the experience of depth in the home theater, 3D technology must to rely on glasses or some other convenient prosthetic to achieve what our eyes and brain do naturally. This can be accomplished by the way each lens blocks the imagery meant for the other eye while permitting the image meant for that eye to pass through. There are two basic ways to do this, each of which has spawned many permutations.
First and most familiar is termed passive or polarized 3D. The passive lenses are in the old bi-colored 3D glasses which originated in the middle decades of the 20th century, one lens red and the other either green or cyan. Called color anaglyph glasses, they were typically framed in cardboard and relied on color filtering to allow each eye to see one of two images that were projected simultaneously upon the screen. Viewing the screen through colored lenses played havoc with color fidelity, causing many viewers to complain about a visually unpleasant and uncomfortable viewing experience.
However, with technological innovation comes progress. The newest passive 3D glasses with polarized lenses rely on separating the two images via polarization of light, rather than filtering color. Light polarized at one end of the spectrum can't pass through lenses made to admit the light from the opposite end of the spectrum, thus two lenses with differing polarizations can deliver two separate images to the eye, recreating the dimension of depth. Unfortunately, this technology isn't compatible with most home theater systems which use DLP, LCD or plasma displays as it relies on front projection systems.
The other kind technology is active, shutter glass 3D glasses. It's "active" because the different lenses have liquid crystals in them along with a polarization filter so that when electricity is applied, the glass darkens and light simply cannot pass through. This means the left and right eye can be shuttered alternately and synchronized with the "refresh rate" of the viewing screen. The glasses are battery powered, and some people experience discomfort with televisions with very low refresh rates, typically 120Hz or less.
Since most television manufacturers are already bringing to market units, which refresh at two to three times that rate and since this technology is easy to adapt into the home theater scenario, it seems the likely candidate for the best 3D glasses.
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Questions and Answers
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