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If there is no flash to black, there is no refresh. It's as simple as that, AFAICT. If you don't believe me, take a look at the status bar when you flip pages - it gets refreshed along with the rest of the screen (and goes through full black as well) and that's a full page refresh.
OTOH, some refreshes seem to not even need a full white-black-white (or grey) cycle. Like the forementioned sync icon, which is grey on black. It would seem that only switching through the extremes of contrast range requires a full recycle/repolarisation.
Anyhow, the point is - if the rest of the image remains unchanged/unaffected/static throughout the refresh, it most definately is a localized refresh.
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