SEDs and radiation
SEDs and radiation
- Subject: SEDs and radiation
- From: Marco Ugolini <email@hidden>
- Date: Sun, 08 Jan 2006 13:42:40 -0800
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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