I used a Kindle4 as status display some time ago. For some months this display was without power and I was to lazy to fix it. My solution in 2014 rooting and image generation is nowadays too complicated.
Repository of Cikos solution: https://github.com/c1ko/statusKindle
My kindle today:
Disable screensaver (source):
;debugOn (press enter) ~disableScreensaver (press enter)