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What is 3D TV?
Three-dimensional television (3D TV) relies on showing each eye the same image in two different locations to trick the brain into thinking the flat image has depth. This is achieved by projecting two images on the display at the same time or in quick succession and using either passive or active 3D eye glasses to convey the left-eye information to the left eye and the right-eye information to the right eye.
In active 3D glasses left and right LCDs turn opaque or transparent in synch with the "left" and "right" images shown on by the display in quick succession. The early versions of displays had refresh rates that were too low for this to work without the viewer detecting a flicker.
To synchronize the alternating images on the screen with the LCD lenses in the glasses, a stereoscopic sync signal connector is used. The connector has three pins and plugs into a port on a 3D-ready TV. The other end of the cable plugs into an IR emitter. The emitter sends signals to active 3D glasses.
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