Colored e-ink displays are discussed at around 8:00 in this video; there are probably better sources, but this is the one I'm familiar with, so I figured I'd li

Colored e-ink displays are discussed at around 8:00 in this video; there are probably better sources, but this is the one I'm familiar with, so I figured I'd link it: https://www.youtube.com/watch?v=MsbiO8EAsGw https://www.youtube.com/watch?v=MsbiO8EAsGw The microcapsules are not individually wired up to anything, so I don't think it's feasible to make each color channel independently addressable. Instead, a grid of wires behind the capsules are either positively or negatively charged, in order to attract or repel the charged colored particles in each capsule. There are only 2 charges, but by using different sizes of particles for different colors, you can finagle it so that the color you want ends up on top. If they could address capsules individually, that would also increase the possible resolution of a black-and-white display; they'd do it if they could. But since the mechanism is about attracting and repelling charged particles, there's probably a pretty hard limit on how much you can increase the resolution before there is interference between neighboring pixels.