Re: SEDs and radiation
Re: SEDs and radiation
- Subject: Re: SEDs and radiation
- From: <email@hidden>
- Date: Sun, 08 Jan 2006 17:45:26 -0500
Marco,
Do I understand this correctly to mean that there is
still a certain level
of X-ray-type radiation, however low-level, involved in
SED technologies?
In principle, yes. In practice, it depends on the
packaging (display glass thickness and content).
Incidentally, do LCDs actually produce no radiation at
all?
Apart from a lot of visible radiation (they can be very
bright as you well know), they emit not much of other
types of radiation (low frequency magnetic fields, x-rays,
and such). There is still some x-rays from the fluorescent
lights found in such displays, but the voltage is not as
high as with CRTs, and not as big a problem.
Danny
email@hidden
www.BabelColor.com
On Sun, 08 Jan 2006 13:42:40 -0800
Marco Ugolini <email@hidden> wrote:
In a message dated 1/8/06 8:34 AM,
email@hidden wrote:
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.
Hi Danny.
Thank you for your explanation.
Do I understand this correctly to mean that there is
still a certain level
of X-ray-type radiation, however low-level, involved in
SED technologies?
Incidentally, do LCDs actually produce no radiation at
all?
Thank you.
--------------
Marco Ugolini
Mill Valley, CA
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