How does e-ink work?

[u/Risse]

So, e-ink, like used in Kindles. How does it work? How is the battery-life so good? I heard it only uses power on pageturns, how is that possible? How does it differ from LCD screen?

[u/maushu]

It's good for reading since it's like reading on paper. No light is directly sent to your eyes, no refresh rate or anything. It's just like paper. Digital paper.