I googled it, and "Always-on reflective 1.28 inch color touch display" makes it sound like it's using Mirasol or some other color e-paper display.
From https://amazfitcentral.com/amazfit-bip-specifications:
> The watch has a color LCD display which shows info with a resolution of 176 x 176 pixels. It is a reflective panel which will allow you to save battery while it is in stand by, as it will still be able to show you what time is it.