Re: Monitor Burn-in

["Michael J. Mahon" <mjmahon@aol.com>]

Simon D. Williams wrote:
> On Sat, 1 Jul 2006, Bill Garber wrote:
>
>
> > "Michael J. Mahon" <mjmahon@aol.com> wrote in message
> > TcudnftH4-iD4gLZnZ2dnUVZ_oudnZ2d@comcast.com">news:TcudnftH4-iD4gLZnZ2dnUVZ_oudnZ2d@comcast.com...
> > : Simon D. Williams wrote:
> > : > I have a IIc monitor that has some images and text burnt into the screen
> > : > (it was running in a store window for 6 months straight!)... is there
> > any
> > : > way to remedy this? I thought of leaving it on with an all-white hgr
> > image
> > : > for another six months, but I don't know if that would actually even
> > : > things out.
> > :
> > : It might reduce the contrast a bit, but the conventional wisdom is
> > : that screen burn-in is a one-way street.
> > :
> > : One interesting possibility is to simply reduce its distraction
> > : potential, by, say, turning the CRT upside down in the monitor.
> > :
> > : > On the bright side, if anyone's looking to refurbish a IIc, I can
> > : > recommend six months in direct sunlight to bleach the case to a pristine
> > : > white ;-)
> > :
> > : That's interesting, since UV seems to be a primary cause of yellowing...
> >
> > Um, that would be filtered UV, Michael, thru glass or otherwise opaque
> > materials such as drapes.
> >
> > Bill Garber
>
>
> Hi Bill... putting in a rare appearance, I see ;-)
>
> Okay, now the only thing I know about light is that it is both a particle
> and a wave, but isn't UV associated with sunlight, whereas most computers
> go yellow under flourescent office lighting? Surely flourescent doesn't
> contain high UV levels, or we'd all be wearing sun-block to the office...?
>
> I have some badly yellowed IIe cases (that came from school with
> flourescent lights), I'm going to leave one outside over the summer and
> see if it bleaches or turns yellow. Any wagers? ;-)
> -s

So, since glass filters out the short-wavelength UV, which Simon reports
cause bleaching (as it does to most things), we are left with the
hypothesis that long-wave (near) UV, or even visible wavelengths, is
the yellowing culprit.

Flourescent light, and to a lesser degree incandescent light, contains
moderate amounts of long-wave UV.

-michael

Parallel computing for 8-bit Apple II's!
Home page:  http://members.aol.com/MJMahon/

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