As a nutshell explanation of ghosting (the more informative term, in my opinion):
Ghosting is a residual "shadow" of the previous screen contents on the present screen.
This was more of a problem in the older displays such as were on the PRS500, the newer "Vizplex" displays don't have nearly as much problem with it. The older one usually only had problems with it when the display had been idle for a period of time, and a few "page turns" would make it go away.
As a real world reference, the old display's ghosting is fairly comparable to the "show through" of text on the other side of a printed page.
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