Samsung UN40D6420UFXZA - Manual (Page 172)

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● The 3D Active Glasses may not work properly if there is any other 3D
product or electronic devices turned on near the glasses or TV. If there is a
problem, keep other electronic devices as far away as possible from the 3D
Active Glasses.
● Be sure to stay within the viewing angle and optimum TV viewing distance
when watching 3D pictures. Otherwise, you may not be able to see 3D
effects properly.
● The ideal 3D viewing distance is three times or more the height of the
screen. For example, if your screen is two feet high, you should sit at least
six feet from the screen. We recommend sitting so that your eyes are level
with the screen.