In essence, your iPhone's Lock Screen wallpaper, widgets, as well as any active Live Operations.
Are all displayed on the always-on display, which is tinted and non-customizable.
A more energy-efficient OLED panel with a variable refresh rate.
As low as 1Hz allowed Apple to add the always-on display to the iPhone 14 Pro models without significantly reducing battery life.
Additionally, the always-on presentation pre-renders each frame for story elements that are expected to change, like the time.
And therefore only upgrades them as needed.
The always-on display will wisely turn itself off in some situations,
according to scenarios provided by Apple.