Samsung UA40ES6200R E-Manual page 196

Light
for PDP TV
is set to On, you can manually adjust
the minimum screen brightness.
N
If the
display brightness may change
(become slightly darker or brighter)
depending on the surrounding light
intensity. You can control the screen'
s minimum brightness with the
Backlight
for PDP TV
: When the
Eco Sensor
for LED TV
function.
Eco Sensor
is set to On, the
/ Min Cell Light
Min.