Re: Early PET Phosphor colour

On 5/20/22 09:32, Julian Perry wrote:
> I believe the first PET screens were just a white small TV monitor: 
> nothing at all special.
> I was never keen on "paperwhite" monitors, as they were more prone to 
> burn-in than green or amber monitors.
> 
> At one stage in the mid 1980's my business was selling paperwhite 
> monitors that were cheap, and low quality.
> You see, as in fluorescent tubes, the phosphor in paperwhite monitors is 
> a mixture of different phosphor compounds that glow different colours, 
> but which, when combined glow white.
> With these particular monitors, however the different phosphors decayed 
> at differing rates: this had the disconcerting effect of the screen 
> going reddish whenever the screen scrolled. Very distracting.

I have seen the same, but the screen had a green afterglow. It was very 
annoying.

  Gerrit