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: G3 <email@hidden>
- Date: Sat, 07 Jan 2006 18:54:28 -0500
Marco,
Good question, but having done some research on electron beams years
ago, the radiation most likely is coming from the abrupt de-acceleration of
the CRT electron beam when it hits the phosphor inside the face of the tube
(Radiation from electrons usually occurs from strong acceleration, in this
case negative acceleration or de-acceleration). I'm not familiar with SED,
but if the electron path is very short (say 1/4 inch compared with about 8
inches for a CRT) then they may use lower voltages for the electrons as the
focus is much easier.
It remains to be seen if sharpness comparable with LCD's is possible.
Traditional CRT's have the problem that as the brightness (electron beam
current) is increased, the energy of the electron beam hitting the phosphors
spreads to adjacent phosphors, thus giving a fuzzier (larger) phosphor
emission. Perhaps someone on the list familiar with SED technology can
comment on whether sufficient brightness can be achieved without too much
softening of the screen image.
Regards,
Bob Manka
On 1/7/06 4:59 PM, "Marco Ugolini" <email@hidden> wrote:
> In a message dated 1/7/06 8:43 AM, Roger Breton wrote:
>
>> This is exciting news, Stefan. I see SED is breathing CRT technology into
>> LCD, instead of looking at a white light filtered by twisted nematics we'll
>> be looking at good old phosphors again but the electron gun and the vaccum
>> tube has been replaced by the surface electron emitters, neat.
>
> 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
> Mill Valley, CA
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