You have to understand the difference between active and passive glasses.
To see 3D, each eye has to see a different image. When you see an image with your left eye, the right eye has to be closed. When the right eye is open, the same image is shown with a slight offset. At 60 frames a second, you end up seeing a 3D image.
In active glasses, each lens has shutters that open and close. This is linked to the TV (or projector) through infrared that makes sure that the images movement and offsets are linked properly to the shutter movement. As the image appears on the screen, the TV alternates between two sets of the same image. Which image to show to which eye is the information that is sent to the active glasses. Active glasses could be quite irritating. And you cant even turn your head. You have to face the TV straight on all the time. If you turn, the infra red signal is lost, and it may take a few moments to sync properly. If the batteries die, you are jacked.
In passive mode, the glasses are made of polarized material. The TV uses a special filter that polarizes each line of the image. The filter makes the odd lines visible only to the left eye, and the even lines visible only to the right eye. Also remember, when you use passive glasses you see only 1,920 x 540. Not full HD.
TV using active 3D glasses are common and expensive. TV with polarization filters are rare and more expensive. You have to make your choice of 3D glasses based on the TV you have. The glasses are not interchangeable.
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