@kragen

> displays take 750mW for 120ms to do a 1-bit (non-grayscale) update,

I think the problem is a little bit more complex. As I mentionned in my article, you basically have 4 different way to update a pixel, 8 if you have a partial refresh system.

It'll mostly depend on the current color of the pixel as well as the desired color.

So in the case of a white -> black or black -> white full update, you're going to draw some serious intensity for at least 3 seconds where in the case of a white -> white fast refresh, you'll probably end up not drawing any power at all.

What I'm trying to say is that I think you can go pretty far in term of power efficiency with a e-ink display (mostly by leveraging their bi-stable nature).