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Sorry to bring this thread back to life, but I've been digging through the archives a little bit (obviously not too far back, though). From what I can tell, the "ghosting" effect seems to be the result of sort of a "low-power" screen redraw. That is, it only seems to appear when bouncing out to the menu screens from a page of text or when bringing up the bookmarks list, etc. Basically, places where you either won't be staying too long or where you won't actually be reading a full page of text. As soon as you go back into the body of the book, you get "full" page refreshes, even on completely empty pages. By doing these "low-power" refreshes on non-book pages, I'd imagine the device conserves a decent amount of power.
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