system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5 How do the screens work for a kindle and how do they never seem to run out of power?
gpt
E-ink is a special type of technology in a screen. Instead of needing a constant supply of electricity to display, it only uses electricity to flip the pixels from black to white or from white to black. Once it's on a particular configuration, it requires no additional electricity to keep the image.

Each pixel is made of liquid and when a charge is placed on them it makes pigment rise or fall on that pixel which then stays in that position until another charge is applied.