3D TVs were hot at the Consumer Electronics Show (CES), one of the largest exhibitions, this year. Market leaders like Samsung and Sony announced TVs with 3D capability. New models with native 3D support are expected to hit stores later this year. Here is a brief look at the technology behind 3D TVs.

The key to understanding how 3D technology works is in understanding how we see. When we look at an object, especially one that is close, each eye sees it at a different angle. The brain then calculates depth using this information. One of the reasons we are able to see depth because of the space between our eyes and manufacturers try to mimic that. They send signals in a way that each eye gets a different image.
 
One concept commonly used in displaying 3D images is polarization. Understand polarization. 3D glasses use polarized lenses, which are essentially filters that restrict some light from passing through. Two different polarized images are projected and each lens blocks out one of them. This way, each eye gets a different perspective of the same image. This method is commonly used in theaters that play 3D movies.

Most people would not appreciate having to wear special glasses while watching TV. Especially people who wear corrective glasses. Newer 3D television sets being designed carry special screens that send a different image to each eye. In these, using special lenses, the picture is shown in columns alternatively angled towards the left or the right eye. These lenses are called lenticular lenses.
 
Though televisions using this technology will be readily available soon, and though no glasses are required, one limitation of this technology is that the effect varies depending on where you sit. There is also a small viewing angle therefore not many people will be able to watch together. However, with advancements in technology, these problems will surely be taken care of.
 
3D content is recorded either using two cameras, or one camera with the light being split and captured by two sensors. While it will take time to become easily available, the advancement in televisions supporting this content is on full swing. And although 3D movies have been around for a very long time, Avatar has taken awareness to the next level with lots more wanting 3D in the comfort of their homes.