Samsung UN46ES6100GXZE - Manual (Page 83)

When on, the TV automatically
adjusts the brightness of the screen in
response to the brightness of the room.
In bright light, the screen brightens. In
dim light, the screen dims.
N Only available in Standard mode.
N This feature is not supported in 3D
mode.
N When you change the Backlight
for LED TV
/ Cell Light
for PDP TV
,
Contrast , or Brightness , the TV sets