LCDs are simply too slow to notice flicker at, say, 50Hz refresh rate (and the refresh happens in a different way).

CRTs with high resolution tend to have shorter decay of the luminophore that's why the refresh rate rockets up to 70-80Hz (this is not the case e.g. with TV CRTs). To be honest, I don't know the exact reason why is it so - I'd say luminophores can be engineered to any decay within reasonable limits, so there must be some secondary reason behind it.

JW


PS. OK maybe there is a better term than decay but doesn't come into my mind right now