The only sensible factor why Apple is so late to bring AOD to its iPhones is power management. Offered the rumors of LTPO (low-temperature polycrystalline oxide) shows on the iPhone 13 series, we might realistically see the long-awaited launching of AOD on Apple smart devices.
Always-on screen (AOD) tech has been around for well over a years yet Apple has hesitated to bring this functionality to its mobile phones until now. According to a fresh scoop from Bloombergs Mark Gurman Apple will bring AOD functionality to its next generation of iPhones. The AOD on iPhone is explained as “Apple Watch-like always-on mode” that shows useful details like time, date and alerts even when the screen is switched off.
Source (needs membership).