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Why do 3D TVs need glasses but 3D phones didn't?

Why do 3D TVs need special glasses but 3D phones didn't?
Why don't 3D TVs use the same "autostereoscopic" technology?

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elliotsamuda  Oct. 4, 2013 at 14:48

I'm assuming because the viewing angle and distance can vary so much on a TV (depending on where you're sitting), whereas with a phone you'll always be looking straight on at roughly the same distance. That being said, I think there are TV's with glasses-less 3D, where you have to sit in specific "sweet spots" to get a 3D image.

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