yeah I believe that was the only option for older / cheaper displays. I recently got a kindle for a present and notice that when it can, it will try to refresh the screen as little as possible.
For example, when you press the top of the screen to bring up the settings, only the top cycles, and then the same when you tap below to get rid of the settings.
To that end, I would be interested in watching some high-speed camera footage of the displays just to see the gears turn. I’ll have a look round and edit this comment if I find any.
also a video from an engineering channel that normally gives good insight into these things, I have watched it yet so it may not be great, but Applied Engineering normally brings some interesting material.
For example, when you press the top of the screen to bring up the settings, only the top cycles, and then the same when you tap below to get rid of the settings.
To that end, I would be interested in watching some high-speed camera footage of the displays just to see the gears turn. I’ll have a look round and edit this comment if I find any.
e: found one.
https://youtu.be/xc6cFkCr1-8
also a video from an engineering channel that normally gives good insight into these things, I have watched it yet so it may not be great, but Applied Engineering normally brings some interesting material.
https://youtu.be/MsbiO8EAsGw