Re: Jessie and screensaver on lid-close
Quoting Sven Hartge (sven@svenhartge.de):
> Bob Proulx <bob@proulx.com> wrote:
> > Gary Roach wrote:
>
> >> I bow to your experience but, for the life of me, I can't see how
> >> this could happen with the physics that is involved. I suppose that
> >> the liquid crystal material could deteriorate with time but I thought
> >> that the stuff was pretty indestructible.
Its mortal enemy is DC voltages being applied. Badly designed
circuits can result in an AC imbalance when being overdriven.
> > It doesn't make sense to me either but I will add that I have seen the
> > "screen burn" effect with LCD displays too. I don't know. I can't
> > explain it. I can only report that I have seen it too.
>
> I guess it has to do with the crystals being no longer able to bend all
> the way after a time if they are forced to do so because the pixel is
> constantly active.
Some explanations and cures at
http://en.wikipedia.org/wiki/Image_persistence
http://compreviews.about.com/od/monitors/a/LCDBurnIn.htm
I think this is different from the burn-in you can get with
high-intensity projective displays where the damage results from UV
light affecting the optically polarizing layers bonded to the LCDs.
Cheers,
David.
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