Now it is clear that someone(s) have been mislead by the Amazon usage of the phrase: "screen saver".
They are not.
e-ink is meta-stable, shut it down completely and it will show what was last written until written again (even years later).
I.E: They do not need to be refreshed.
What Amazon calls a "screen saver" is a static image that can be shown while the device 'sleeps'.
Mostly, a Kindle 'sleeps', that is how they get the advertised long battery run times - because mostly it isn't running.
Don't you love substituting marketing lingo for technical description?
That is: those static images are "battery savers" - they leave behind something to look at while the device is not running.
E-Ink can produce latent images, but it is not damaging, just cycle the screen black->white->black->etc a few times.
(The system does this for you, based on various environmental factors.)
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Now that we all know what the images that are called "screen savers" both by Amazon and by this site really are ("battery savers");
We can take a look at what happens when you add a (real) 'screen saver' for a non-metastable device (one that requires refresh).
Since the movement that prevents the non-metastable device from producing a latent (burned in) image is computed - -
You have just tossed away the battery run time of the Kindle, since to support the movement, the cpu (and other hardware) has to run.
Then your Kindle is back in the land of under powered devices -
It only has a battery capacity for from 2 hours to 4 hours of run-time.
Normally stretched out over a month of calendar time, but here burned away making the "screen saver" have (un-needed) motion.
= = = =
As one more want-to-be C.S. engineer shoots self in foot . . .
Once upon a time, such non-planning was a requirement of applying for a job with Lab126.
