Re: Colorsync-users Digest, Vol 3, Issue 5
Re: Colorsync-users Digest, Vol 3, Issue 5
- Subject: Re: Colorsync-users Digest, Vol 3, Issue 5
- From: <email@hidden>
- Date: Sun, 08 Jan 2006 11:34:04 -0500
Marco,
In CRTs the "harmful" radiation is essentially from two
source:
1- the x-rays generated by high velocity electrons,
accelerated by 30 kV plus voltages, which hit the metal
grid around the phosphors and high density elements in the
phosphors themselves. The larger the tube, the higher is
the voltage required, and the higher the voltage, the
higher is the x-ray energy. A thick (heavy, think Sony
WEGA) leaded glass is used in these tubes to absorb most
of the radiation.
2- low frequency electro-magnetic produced by the
deflection coils. This is, also mostly, filtered by
suitable metallic shields.
The operating voltages in SED display are around 10 kV,
the electrons are much better confined (no spill on shadow
mask), and there are no magnetic deflection coils. Because
of this, the "harmfull" radiation level should be much
lower, and not be as dependant on display size.
Danny
email@hidden
www.BabelColor.com
On Sat, 07 Jan 2006 23:49:20 -0500
Roger Breton <email@hidden> wrote:
Not to be critical, but don't phosphors reintroduce some
of the radiation
levels to the user that LCDs had taken out of the scene?
Or was the
radiation in CRTs generated solely by the tubes?
Just wondering.
--------------
Marco Ugolini
So, not so good news after all? On strict ergonomic
ground, maybe. I'll
confess I don't know enough about SED to really say
whether they'll expose
the user to the same, lower or higher level of
radiation.
But I always thought that CRTs grays were superior to
LCDs grays.
That's why I think this technology is good news, on
strict colorimetric
ground.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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