This is cool, but e-ink displays have generally had 3 major differentiators from normal screens:

1. Comfort reading for long periods.

2. Ability to read outside in the sun.

3. Battery duration.

Of those, by far the most important is the first, and this product is specifically targeted away from that. The third isn't a big deal for a stationary item that can be wired or plugged in.

I wish you well, but I don't immediately see the problem it's solving - though there may well be some sort of gap in markets dealing with outdoor products, eg garden centres and the like.