>>719016728
you know about Yotaphone, it had an e-ink display on the backside. You'd think this would greatly improve battery life, but it didn't really shine there as well. Maybe it was better for reading e-books, but the normal use battery life was at best average.
People are just used to charging every day, that nobody cares about innovation in that field. Every extra bit of energy will just be wasted on whatever.
I miss the time when we had efficient screens for specific devices that only showed the necessary information, instead of slapping a HD 12gorillion colors touchscreen on everything. A shame e-ink screen went nowhere.