Samsung
Turn Always On Display On or Off auf Samsung
Always On Display keeps basic information visible on a locked Samsung phone, including the time, date, notification icons and currently playing music, without you having to wake the full screen.
The feature only lights up a small number of pixels on the AMOLED panel, so the battery impact is usually minor. On older devices or with heavy background activity, some users still notice a difference and prefer to switch it off completely.
To change the setting, go to Settings ➔ Lock screen ➔ Always On Display and toggle the option on or off.
If battery life is the main concern but you still want quick access to the clock, look for a Tap to show or Show for 10 seconds mode instead of Always show. That keeps the panel dark until you touch it, saving power without losing the shortcut.
Turning the feature off entirely also removes any custom clock style or widget you configured for the lock screen, so check those first if you rely on them.