Canon PowerShot SX400 IS Black Manual (en)

Screen Brightness
Adjust screen brightness as follows.
Choose [LCD Brightness], and 
then press the [ ][ ] buttons to 
adjust the brightness.
For maximum brightness, press and hold the [
] button 
for at least one second when the shooting screen is displayed 
or when in single-image display. (This will override the [LCD 
Brightness] setting on the [
] tab.) To restore the original 
brightness, press and hold the [
] button again for at least 
one second or restart the camera.
Hiding the Start-Up Screen
If you prefer, you can deactivate display of the start-up screen 
normally shown when you turn the camera on.
Choose [Start-up Image], and 
then choose [Off].