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>> Yes, even absolutely tiny amounts will make the LC useless.
>
> Really? I thought it might just make the edges go a bit fuzzy or
> something...
Something to do with how the moisture gets absorbed by the LC, of course it
starts from the edges wherever there is the "leak", but it quickly spreads
across the whole panel until you don't get any picture. I suspect the water
molecules are severely impacting on the electrical/optical properties of the
LC, and given that you're talking about a thickness of a couple of microns
you don't need many water molecules to mess things up!
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