TL;DR: Always-on displays don’t drain your phone battery because they rely on two hardware advancements: OLED panels and LTPO technology. OLEDs save power by physically turning off pixels to display black backgrounds. Meanwhile, LTPO allows the screen’s refresh rate to drop to 1Hz, preventing the CPU from constantly waking up. I often glance down at my phone sitting on my desk. The screen is technically "sleeping," but the time and a few notification icons are still glowing brightly. As a softwa