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Thanks for your clear answer. Thinking at it, my Glo HD's screen is broken, and annoyingly slow. I left it in my room for about 1 year after I lost the firmware on the SD card (at this time, I was not aware that a forum for that existed).
Then a month ago I recovered the SD image and imaged it to the internal SD of the Kobo. I opened it, and maybe I pressed to hard on the back, because when I turned it on, the screen had lines (oops!). The responsivity was good, though. Then, the screen began slowly to become more slow, and finally was no longer doing refreshes. It was now pure garbage.
In last resort, I tried removing the screen to see if I could do something, and I loosened the screws on the back of the Kobo. I turned it on. Magic! It was working, now! Hmm... kind of. The lines are now completely opaque and measures about 1.5 cm each. The responsivity is SLOOOOW: you have to count 6 seconds before your input is actually registered on the screen. Also, due to some screen problem, non completely refreshed items (like menus, font menus, drop-down lists, etc.) are impossible to read (faded out in the back of the screen in a thin, invisible white layer.
But otherwise... the contrast is still excellent. Actually, it is slightly better than on my Libra. The blacks are very clear (when it's refreshed) and sometimes, when I do multiple tasks continuously on the screen, it speeds up and goes back to a normal responsivity delay.
So my thinking then: eInk can be broken, but seem to work (in certain cases) after tinkering. Also, my Glo HD's 5 years old, and still displays blacks perfectly. Does not seem to be any fade of any type in that way.
So........... maybe we can agree that they don't wear?
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