Adjust the iPhone screen brightness and color
On iPhone, dim the screen to extend battery life, use Night Shift, and automatically adjust the screen for your lighting conditions.
Adjust the screen brightness manually
To make your iPhone screen dimmer or brighter, do one of the following:
Open Control Center, then drag .
Go to Settings > Display & Brightness, then drag the slider.
Adjust the screen brightness automatically
iPhone 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
Schedule Night Shift to turn off and on automatically
Use Night Shift to shift the colors 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 color balance for Night Shift, drag the slider below Color 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, iPhone 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.