Samsung PN51D490A1DXZA E-Manual page 220

Issues
3D
The 3D Active Glasses are not
working correctly.
The 3D images don't look quite
right.
◀
The batteries in the 3D glasses
don't last.
Solutions and Explanations
•
Make sure the glasses are turned on.
•
The 3D Active Glasses may not work properly if there is any other 3D
product or electronic device 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.
•
The ideal viewing distance is three times or more the height of the
screen.
•
We also recommend sitting with your eyes on a level with the screen.
•
Turn off 3D glasses while not using them. If you leave 3D glasses on,
battery lifespan is shortened
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