On an LCD also nothing changes when the display image is static. When the image is not static, because an LCD updates line by line, if you don't coordinate you

On an LCD also nothing changes when the display image is static. When the image is not static, because an LCD updates line by line, if you don't coordinate your data updates to the refresh rate you can get artifacts such as "tearing", where different sections of the monitor show different data that doesn't fit together. However, e-ink displays doing differential or fast partial updates have similar problems (and some exciting new ones, making refresh overall quite bad). You just usually don't try to display fast moving imagery on them. e-ink displays are what is known as "bi-stable", meaning you don't need to apply a voltage to keep a pixel in a particular state, only when you want to change that state. This is not true for LCD, where you do need to keep supplying a voltage. This however doesn't result in any visual change if the voltage isn't changing. The real difference here is that LCDs aren't reflective, unlike e-ink. So you need a backlight, and that light shining at your eyes is more tiring than how things work with an e-ink display. That either doesn't need a backlight (in a bright ambiance), or the LED lighting isn't behind the display and doesn't shine directly at you, but rather bounces through the display surface. This is a nice quality.