Canon VIXIA HF S10 Instruction Manual page 32

Repeat this action to turn the LCD backlight on (bright) or off (normal).
If [__ O [LCD Screen Dimmer] is set to [_ On] (83 147), pressing
for more than 2 seconds will turn off the screen dimmer and
return the LCD screen to its previous brightness setting.
The LCD backlight does not affect the brightness of the recordings.
Using the bright setting will shorten the effective usage time of the bat-
ten/pack.
You can further adjust the brightness of the LCD screen with the [_ O
[LCD Brightness] setting (Eli 147), or dim it with the [_ O [LCD
Screen Dimmer] setting (83 147) to use in places where the light from
the LCD screen can be a nuisance.
32 _ P_epa_'at or s