Samsung PN51E490B4F E-Manual page 136

Some file format may not be supported the "2D → 3D".
N
N "Side by Side" and "Top & Bottom" are available when the resolution is
720p, 1080i and 1080p in DTV, HDMI and USB mode or when set to PC
and the PC is connected through an HDMI/DVI cable.
N When you watch 3D images under flickering lighting such as a fluorescent
lamp (50Hz ~ 60Hz ) or a 3 wavelength lamp, you may notice some
screen flickering. If this occurs, dim or turn off the light.
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