title_body: Does a screensaver serve any purpose on eink displays?
upvoted_answer: Technically it isn't a screensaver since the images are static (unless of course the device cycles through images at regular intervals). Either way, e-ink doesn't suffer from burn-in, so it really isn't necessary.
  
  What a screensaver (we'll call it that) does do is show that the device is sleeping, so it will not respond to commands (either via touchscreen or buttons, depending on the device).