Samsung UN75ES9000F E-Manual page 277

If the input resolution is not 1920 x
1080, the TV may not display images
properly in 3D display or full screen
mode.
How to watch the 3D images
Some 3D modes may not be available
depending on the format of the image
source.
To watch in 3D, you must wear 3D
Active Glasses and turn the glasses on
by pressing the power button.