Why does my ereader lose contrast with small changes after a long time on one page?

I have a Sony PRS-505. Recently i noticed that if i leave it on with a book open the contrast stays sharp, but then making it change something small like pressing a volume key or removing a bookmark makes the contrast suddenly worse until i turn to a different page. Why does the contrast get worse all at once instead of slowly degrading over the hours it's left on a page?

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1 Comments

IndigoGollum@lemmy.world · 1 pts · 296d

But not consistently. I just plugged it in to charge after not using since last night and though part of the screen (the battery indicator) updated, contrast remained fine. Weird.