For any passive 3D television, the 3D glasses from movie theaters will work.
LG only make passive 3D television. They do not supply any models that are active 3D.
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Number of 3D contents is increasing as 3D TV becomes more popular but it's true that there could be more. Some 3D TVs have 2D to 3D conversion feature which lets you watch any 2D content in 3D.
I think there is no such technology that can provide a 3D movie in a normal TV as if you want the 3D effect you've to use 3D TV.
LG 3D TVs have the cheapest glasses. The passive 3D TVs that is. They require the use of polarized lens which will work on almost any passive 3D TV and the cinema as well.
All 3D televisions can operate as 2D televisions as well.
Passive 3D TVs polarizing glasses similar to those at the movie theaters.
Plasma TVs can be in 3D. Samsung and Panasonic both make Plasma 3D TVs, as seen on www.bestbuy.com. The Samsung plasma 3D TV seems to be a little less expensive than the LCD TVs.
The HTC EVO 3D shows everything in 3D on its 4.3 inch touch screen. As well as the ability to transfer all 3D content captured from the phone to any 3D capatable tv.
LG and Samsung have this feature. Be aware that converting 2D to 3D is not a perfect process and the 3D images may not be accurate or realistic. 3D televisions are designed to work with 3D content so any simulation of 3D from 2D content must be regarded as a bonus feature.
There are several brands that offer a 3D simulation. It is important to understand that a simulation is never as good as real 3D content and can be disturbing when the simulation is wrong. Try the 2D to 3D conversion when you see the televisions but don't be disappointed when the results are poor.