Samsung UN50ES6100 E-Manual page 235

images or symbols on the screen,
especially after you displayed a still
image on the screen for a long time.
N
The after-image removal function
has to be executed for a long time
(approximately 1 hour) to effectively
remove after-images on the screen.
If the after-image is not removed
after you apply the function, repeat
the function.
N
Press any button to cancel this