Brightness & Wallpaper
Use Brightness settings to adjust the screen to a comfortable level.
Adjust the screen brightness: Go to Settings > Brightness & Wallpaper and drag the slider.
Set whether iPad adjusts screen
Go to Settings > Brightness & Wallpaper and turn Auto-Brightness on or off.
If Auto-Brightness is on, iPad adjusts the screen brightness for current light
conditions using the built-in ambient light sensor.
Wallpaper settings let you set an image or photo as wallpaper for the Lock screen or Home screen.
See “Changing the wallpaper” on page 27.