iPad - Adjust the iPad screen brightness and colour
On iPad, Dim the screen to extend battery life, and use Night Shift to shift the colours in your display to the warmer end of the spectrum at night and make viewing the screen easier on your eyes. On supported models, use True Tone to automatically adapt the colour and intensity of the display to match the light in your environment.
Adjust the screen brightness manually
To make your iPad screen dimmer or brighter, do one of the following:
Open Control Centre, then drag 
.
Go to Settings 
> Display & Brightness, then drag the slider.
Adjust the screen brightness automatically
iPad adjusts the screen brightness for current light conditions using the built-in ambient light sensor.
Go to Settings 
> General > Accessibility.
Tap Display Accommodations, then turn on Auto-Brightness.
Turn True Tone on or off
On supported models, turn on True Tone to automatically adapt the colour and intensity of the display to match the light in your environment.
Do any of the following:
Open Control Center, touch and hold 
, then tap 
to turn True Tone on or off.
Go to Settings 
> Display & Brightness, then turn True Tone on or off.
Schedule Night Shift to turn off and on automatically
Use Night Shift to shift the colours in your display to the warmer end of the spectrum at night and make viewing the screen easier on your eyes.
Go to Settings 
> Display & Brightness > Night Shift.
Turn on Scheduled.
To adjust the colour balance for Night Shift, drag the slider below Colour Temperature toward the warmer or cooler end of the spectrum.
-
Tap From, then select either Sunset to Sunrise or Custom Schedule.
If you choose Custom Schedule, tap the options to schedule the times you want Night Shift to turn on and off.
If you select Sunset to Sunrise, iPad uses the data from your clock and geolocation to determine when it’s nighttime for you.
Note: You won’t see the option to turn on Night Shift from sunset to sunrise if you’ve turned off Location Services in Settings 
> Privacy, or if you’ve turned off Setting Time Zone in Settings 
> Privacy > Location Services > System Services.
Turn Night Shift on or off manually
You can turn on Night Shift manually, which is helpful when you’re in a darkened room during the day.
Open Control Centre, touch and hold 
, then tap 
.