Samsung UE40ES7000U E-Manual page 309

Select the 3D input format.
N
If you want to experience the 3D
effect fully, put the 3D Active Glasses
on first, and then select the
from the list below that provides the
best 3D viewing experience.
: Turns the 3D function off.
Of f Of f
: Changes a 2D image to 3D.
: Displays two images next to each
other.
: Displays one image above another.
3D Mode