Ok I'm confused now. So is this thing considered epaper, eink, both or neither?
Is one a subset of the other? If so which is the superset?
Is one a subset of the other? If so which is the superset?
E-paper is an informal category that anyone can use for any display type.
The display in this video/article is also electrophoretic, but not all displays called e-paper are and it’s aggravating. An example: https://kentdisplays.com/products/color-epaper-displays/
"E-paper" means very little. It may mean "static" (and yet not necessarily "bistable", not even necessarily "efficient"), it may mean "reflective"... It is a marketing term.
So no, there is no real "agreed understanding" in it.
I would not be sure about that "everyone" - yes, clearly it should mean "reflective" (or similar, i.e. "improving visual conditions"), but it also may mean bistable or approaching that ("efficient"). (Paper has many different advantages.) Technologies to approach "better reading" features vary - in the tricks and in the gains. The term "electronic paper" is so slippery that in fact online news brodcasters can call their web distributed content (online news-/non/-papers and magazines) "epapers". All considered, avoidable term, unless we are clear about the point in the specific context we mention it.
> not just a marketing term
I meant, "so easily employable as a simplification for the customers".