Also know as electrophoretic displays.
What is e-Ink?
- Display Technology that uses positively and negatively charged Pigmented Dots.
Image above is from E Ink - Works a bit like an electronic Magna Doodle
- The biggest difference here, is the dots are a lot smaller
- They support levels are gray
- In the case of tablets from reMarkable, SuperNote or Boox there is software that understands where you drew and when and stores that information.