You're thinking of e-ink. e-paper has always been used to describe this type of low power LCD screen. I first came across the terminology with the Pebble watches.
I cannot think of ever having encountered “e-paper” being used to refer to any kind of LCD, but I’ve come across it being used to certainly refer to electrophoretic displays many times, and that’s all I obviously find by a general web search too.
(Pebble? I dunno, I thought they used e-ink. Never saw one in person. If it is not so, I’m curious whether they ever used e-ink, or whether it was an extremely widespead misunderstanding through all of their history.)
You're thinking of e-ink. e-paper has always been used to describe this type of low power LCD screen. I first came across the terminology with the Pebble watches.