Smartwatches with an LTPO display

LTPO is the backplane technology that lets a panel drop its refresh rate very low when the content is still, saving battery, and raise it when you scroll. Whether the panel is OLED or AMOLED is a separate matter; LTPO sits on top of one of them. A value that does not say LTPO is not listed here; when the maker did not state it, it is not assumed.