Originally Posted by tribble
And it is to prevent "burn in".
After a long period of not using eink, ist better for contrast and readability to start from a clean slate .
I'm not convinced burn in exists with eink. That's an old concept more in line with cathode ray tubes where the phosphor inside the tube really got burned. My reader was subjected to a continual display that lasted 4 days and no sign of burning.
To try it on the reader follow these instructions.
Just bring whatever you want to display up on the screen, and click the Reset button on the back.
That makes everything stop, and the display will stay as it is until you reboot it by hitting the power button.
S'all there is to it.