Quote:
Seems to me that burn-in is more a function of "length of time pixels are consistently illuminated" than "total duration that a given pixel is illuminated."

I don't know how VFDs work, but if it were a CRT, that statement is incorrect. For CRTs, it really is simply the total illuminated duration. "Burn-in" is just a shorthand way of saying "uneven aging of the phosphors" (when talking about CRTs).
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Tony Fabris