10 Nov
2012
10 Nov
'12
1:05 p.m.
On 9 Nov 2012, at 1:32 PM, Cindy Croxton Electronics Plus wrote:
A Trinitron CRT has 3 cathodes (one for each priamry colour), albeit with
one set of grids/anodes in front of them. Whether that's one electorn gun
or three is a matter of debate.
However, I do not see why a single cathode, single electron gun CRT can't
display a colour image. Onme scheme that was proposd was to put narrow
vertical stripes of the 3 phosphors on the screen, have no shaddowmask or
apaertuee grille and just sacn one beam over them. Then swithc the
modulation signal appopriately as the beam passes each colour of
phosphor. Getting the switching synchronised with the beam position was
the problem, anmd AFAIK it was never used commercially, but ti could work.
And I still don't see why a B&W CRT with a rotating colour filter wheel
in front does not displa colour images for any reasonable definition of
'colour image'.
-tony
Color CRT monitors have 3 guns (red, blue, and
green) but a mono monitor has
only 1 gun. So even if you used filters to "fool" yourself into thinking
color, it can't actually be color, because there is only 1 gun!
*cough* Trinitron *cough*