3D TV: characteristics that differentiate the various technologies used by manufacturers
In shopping malls and appliance stores, between the various models of televisions are the 3DTV, which are now also at low prices and less than 500 Euro.
Anyone who is considering buying one, can read in detail what it means 3DTV and what different types exist.
To make a three-dimensional video is resumed with a special technique of double recovery, which simulates double vision right eye and left eye.
The technique of 3D cinema, based on a double recovery, projecting two images on the screen or simultaneously or alternately.
The 3D TVs are differentiated based on the type of screen and glasses to see three-dimensional images.
1) Active Shutter or alternate image.
A 3D TV displays this type of sequential frames, one for the left lens and one the right eye in rapid succession.
The glasses are synchronized to the same frequency as the TV so while passing the frame for the left eye, the right remains blank and the images are projected alternately.
This sequence occurs so rapidly, about 60 times per second, which is hardly noticeable.
I say "almost", because some people are aware of a light flash and text often complain about pain after prolonged use.
It can be said that this type of 3D TV are set to "active shutter", because the glasses have LCD screens and require battery power or charging via USB cable.
Glasses to see 3D movies weigh more and cost more than other types of glasses.
This type of screens, however, are the best that you can find (and popular) because each frame is completely blocked on the other eye, bringing less overlap between images.
It also gets more light because one frame is displayed only once at the same time, while the passive screens show images both left and right.
2) 3D Passive (polarized)
A screen Passive 3D displays two occasions together, but each frame is run through a polarizing filter other than that "aligns" the light waves in one direction.
When these light waves hit the 3D glasses, they encounter another set of polarizing filters, so that the light which is meant the right eye, moving to the right while the one for the left eye to the left.
The quality of the passive 3D is not so good because it does not allow to give depth and suffers images turbid.
Since then freezes half of the total luminosity given by the TV, the image gets darker than what happens with the active display.
On the other hand, passive 3D TVs are much cheaper and the glasses do not need batteries, they are light and do not cost anything, ideal for children.
3) Lenticular (without glasses) is the technology behind the new generation of 3DTV that does not need glasses and can function as screens for any video source, including video games.
The technology runs a bit 'to optical illusions in hologram, where while watching an image in a certain way it is seen in three dimensions.
The light is directed at specific angles such that, if you close one eye and goes around the TV, you should see the image on the right and the left.
To watch in 3D with this type of screens, it is necessary that you stand in front of an almost perfect at the right distance.
Although it is nice the idea of being able to watch TV in 3D without glasses, the fact that there are specific viewing angles makes this technology difficult to be enjoyed in full and not practicable in cinema.
I do not believe in TV sales are of this type.
4) emulation and 3D conversion from 2D to 3D
Most TV-3D gives you the additional ability to convert videos in 3D and normal movies were shot in 2D.
Using a series of algorithms, the TV tries to analyze the image and distinguish objects in the foreground from the background and then create the illusion of 3D images with the objects in the foreground pushed forward, creating a sense of "closeness".
The result is bad because the computer is not able to obtain optimal results and the image loses quality.
It is therefore worthwhile to activate 3D vision is actually transmitted only if a 3D movie like Avatar or others.
In general I do not know if it's worth a 3D TV or not.
The technology is good, but the limitations are the lack of content, movies, video games and tv channels that are broadcast in three-dimensional mode.
If you own a 3D TV is almost a must a Sky subscription or purchase DVD with Blu-Ray 3D movies to be seen in the reader (also to buy).
In essence, the expense can be considerable and perhaps not accessible to all, especially these days.
10/01/2013
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Translated via software
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Source:
Italian version of ReteArchitetti.it