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active shutter creates images for left and right but needs 120hzt screen to reduce to 60hzt per eye, but you get full HD, where as in passive the picture is split into 2 but using left and right eyes at the same time on screen from left to right , pixel for left eye , pixel for right eye and repeat across the screen, so a 1080p becomes 540p, not flicking between the picture for each eyelike you get for active, and in the cinema, you use pollorized glasses, but the projector uses a system like active shutters , flicking between each eye, through a reflector system and polorized lenses....... do not compare passive with the cinema polorized, unless you're using 2 projectors at home.....
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