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TV has different stages of evolution up till now and it’s enhancement is still in progress. The producers offered various up gradations in 2D technology like Plasma and LCD TVs. The sizes offered reach up-to 61 inches. Now, the producers are focusing on 3D technology. 3D TVs in homes will allow the viewers to move and watch around a wall or any other object in the 3D movie. How a 3D TV works? That’s the question everyone is curious about. The article under discussion is aimed to explain how a 3D TV works and what are different techniques of 3D technology used to create the illusion of 3D images on a 3D TV.

Fundamental principle behind the working of 3D Technology:

The most important aspect of a three dimensional technology, one should always keep in mind is the fact that it’s a deceptive image; which means just an illusion is created by the scientists regarding the Z dimension of an image.  The fundamental principle of science behind creating the illusion of a three dimensional image is explained below. The principle explains how our vision actually works in case of 3D TV or any other 3D technology.

The two eyes of an individual are around 3 inches apart. If the same image is revealed to the two eyes of a single person from a slightly different angle, two different views/outlook of the same image will be created for the two eyes of a person. When the brain will merge these two dissimilar images, the image seems to be three dimensional. The brain creates a “sense of depth” while it merges two slightly variant images and calculates the difference between two images as distance. As the same image is viewed by two different angles so the distance between the two self-created illusionary images also differs (just in illusion, not actually) and this difference of distance ultimately creates sense of depth.

A 3D TV works for home users same way. The human brain is involved in the same trick mentioned above for he pictures being shown in a TV. The major issue revolves around the question that; how someone can be made to view slightly dissimilar outlooks of the same image to each of the eye?

1. Techniques used to create 3D effect in 3D TV:

The 3D TV and 3D movies are based on the following bifurcation of techniques used from the technological perspective:

  • First Technique (Uses specialized Glasses)

The first technique combines two differing images into one image. Further there are two ways to make the images different from one another for the two eyes of an individual first, “by color filter” and second, “by polarized filter”. Viewers need to wear glasses in both cases.

  • By color filter ___(Uses Color Filter Glasses)

The viewers are required to wear 3D glasses having colored lenses of two dissimilar colors. The glasses change the color of the picture for the two eyes. Glasses used in this method are called “Color filter glasses”. The glasses make each eye to see two different perspectives of the image, by enabling the viewer to view from two different angles and create a 3D effect. This techniques is also known as “Anaglyph” was used earlier for black and white 3D TV however; with advancement in technology it can be used for color 3D TV. Under this technique, the image quality of color 3D images is not up to the mark.

Strengths: Cost-effective, easy and fast to be watched

Weaknesses: Color filter glasses can cause headache, nausea and icky feeling as image moves and image quality is not supreme.

•    By polarized filter ___ (Uses Polarized Glasses)

Polarization works on the identical principle with the difference that it doesn’t change the color of the picture being viewed on 3D TV. In contrast, polarization changes the waves of light being viewed by the viewer. The glasses have two lenses with different polarization known as “Polarized Glasses”. This technique is the one used in 3D movie cinemas.

  • Strengths:  Light-weighted glasses and superb image quality.
  • Weaknesses: 3D TV makers lack on this technology and it’s relatively expensive.

2. Second Technique___(Uses No Glasses)

Relatively less prevailing and the most recent technique, requires no glasses. This technique uses lenses in front of 3D TV rather than on the eyes of viewers. These filters on 3D TV screen direct dissimilar images to both eyes. Initially this technique required a specific distance form 3D TV to be maintained otherwise 3D effect used to distort (Nintendo uses this method) however; the new improvements overcome this short coming. Now, through face recognition software images are adjusted in real time to the current location of a viewer (Microsoft has created such screens).

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