Always-On Display is a smartphone feature that shows limited information while the phone is asleep. It is widely available on Android handsets. On some Android phones, the feature is called Ambient Display or Active Display depending on its implementation and behavior.
Purpose of Always On Display
Always on displays keep a portion of your turned on to showcase the time, date, notifications, or other small bits of information, and allow you to quickly glance at your phone at any point to catch up on what's new.
