Facts About 3D Televisions
Facts About 3D Televisions
Home 3D televisions work in a couple of ways. They can either use active shutter glasses together with high refresh rates to generate images to one eye at a time or they can utilize autosterescopic displays. These differ from the 3D motion pictures we have seen in movie theaters that use passive 3D technology with polarized glasses. The active shutter glasses aren’t polarized and the autosteroscopic displays do not require special glasses at all.
The 3-d movies played in movie theaters use passive 3D technology. Two pictures are displayed concurrently. Audiences wear polarized eyeglasses which filter the images into left and right eye to form the 3D effect.
The home 3D televisions such as Toshiba 55WX800U and Samsung UN55D8000 deliver pictures at the rate of 120 frames/second. Since the images are shown alternatively on right and left eye, each eye effectively gets 60 frames per second. The active shutter glasses are synchronized with the TV through Bluetooth, WiFi, or radio frequency. When the TV is showing pictures created for the left eye, the right lens of viewer’s active shutter glasses turns opaque, which blocks the images from been seen by viewer’s right eye. Similarly, when the TV is showing pictures for the right eye, the left lens turns opaque.
The active shutter glasses are battery powered and quite expensive. They often cost 0 a pair. On the other hand, the polarized glasses are economical – normally around or . It would be best if we can view 3D TV without the glasses. The manufacturers that are developing autosterescopic screens use optical components such as lenticular lenses or parallax barriers to create different images to each eye.
The downside of these kinds of technologies is that they are designed to create a good 3-d picture only at a specific distance and throughout a narrow range of viewing angles. The lenticular lens system used by LG, as an example, requires an ideal watching distance of precisely 13 feet. Parallax barriers, such as those used by Sharp’s 3D televisions, can be either liquid crystal formed lenses or hard ones. The liquid crystal type has the advantage of having the ability to be turned off to allow conventional TV viewing on a single set.
In more recent years we have seen alternative types of these screens emerge, like Integral Imaging that uses very fine images which are viewed through an array of spherical convex lenses in which the brain then views as a 3-d picture. It is a hard lens type of the parallax barrier. HoloVizio has developed a type of parallax called “continuous motion” which uses “voxels.” These are substitutes for pixels that project a number of beams of light in numerous directions concurrently.
If these glasses-free types of 3D television sets gain popularity, people would be required to design rooms which are long and narrow to allow for optimal viewing by the majority of people. In the mean time, the active 3D technology continues to drop in price, enabling more and more people to afford these kinds of home units, which work together with 3-d Blu-ray dvd players and 3D movies online.
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