3D 101 Video Tutorials

The currently available 3D TV screen displays two images, one for the left eye and one for the right. The 3D glasses are needed to alternate between left and right to fool the viewers brain into processing the image in 3D.
Its the same trick that lets you think the pictures are moving when realy your TV just shows a bunch of still pictures one after the other.
When you feed separate still pictures to each eye it creates depth perception, and when you feed a bunch of still pictures to each eye you get a 3D motion picture, or 3D TV.
3D-ready TV sets can operate in 3D mode, and also in regular 2D mode.

In models that use LCD shutter glasses, the TV sends the timing to the glasses which allows each eye to see only the frames it is meant to see, to produce a stereoscopic image. Extra glasses may be purchased separately.
These 3D TV sets usually support HDMI 1.4 and a refresh rate of 120Hz (twice that of a normal screen because it displays two separate images at the same time).
Major manufacturers like Samsung, LG, Phillips, & Sony expect to boost production of 3D TV products and by 2012 plan to make 3D TV sales account for over 50% of their TV product offerings.

National Geographic: Sea Monsters - A Prehistoric Adventure (In Anaglyph 3-D) [Blu-ray]

History of 3DTV

Though many people are resistant to the percieved change from 2D to 3D, they may not be aware that 3D has been around from the beginning of photography.
David Brewster invented the Stereoscope In 1844 that could take 3D photographs, and by the 1940s the use of personal 3D cameras was already common. Experimental 3DTV broadcasts happened as early as 1953, with the first commercial 3DTV broadcast taking place in the USA in 1980.

In the 1950s 3-D movies were very popular. 3D movie theaters opened all over the world with a new high resolution format, and gave audiences a highly satisfactory stereoscopic 3D experience.
Today a number of new cable, Direct TV and broadcast 3D channels are preparing to launch at the moment, including a 24 hour broadcast Discovery channel.