There are plenty of smartwatches with transflective displays today (e.g. most Garmins). Unlike normal LCD or LED displays they're perfectly readable in direct sunlight (with a reduced color gamut), they have great refresh rates, and basically become normal LCD displays when they have to. They do consume power more aggressively than e-paper/e-ink though: Garmin watches last a few days, while my Fossil hybrid smartwatch lasts a couple weeks.
I just wish they made laptops with them. I'd buy a laptop I can use at the beach with sunglasses in a heartbeat.
I just wish they made laptops with them. I'd buy a laptop I can use at the beach with sunglasses in a heartbeat.