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Why Do I Need To Wear Special Glasses To Watch 3D?


Question: Why Do I Need To Wear Special Glasses To Watch 3D?
Answer: The reason you need to wear glasses to watch 3D is that a separate image needs to be sent to each eye, with the brain combining the two images into a single image with 3D characteristics. In other words, the 3D process actually fools your brain into thinking it is seeing a 3D image, so it creates one for you.

The way this works with 3D-enabled TVs is that even though there will be several ways a 3D signal can be encoded and sent to the TV, the TV will decode the 3D signal and display the left and right eye information on the TV screen appears to look like two overlapping images that look slightly out of focus when viewed without 3D glasses.

Now, some of you are probably thinking that there are technologies that enable you to see a 3D image on a TV without glasses. Such prototype and special application units do exist, usually referred to as "AutoStereoscopic Displays". Such displays are extremely expensive and, in most cases, you have to stand right in the center spot, so they are not good for group viewing.

However, progress is being made as no-glasses 3D is becoming available on some cellphones and portable game devices and has been demonstrated in a larger screen TV screen form factor as Toshiba, Sony, and LG all showed prototype glasses-free 56-inch 3D TVs at the 2011 CES and Toshiba showed an improved model at the 2012 CES that is available in limited quantities in Japan and Europe.

Although autostereoscopic display technologies are being pursued and implemented in targeted settings on a limited basis, this approach to 3D viewing still needs to be further perfected before it can be sold widely in stores. However, the progress so far is encouraging.

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