What's the difference between reflectance, reflective, and white reflectivity? (
https://wiki.mobileread.com/wiki/E_Ink_display)
What makes more of a difference, the "reflective" stat or the white reflectivity stat?
In any case, it seems that Carta isn't that much of an improvement over Pearl in either. Some pages suggest that electrofluidic e-paper has a much higher reflectance than e-ink, but I don't know whether this is anywhere near a commercial application.