18 Oct
2008
18 Oct
'08
12:59 p.m.
On 17 Oct 2008 at 21:38, Tony Duell wrote:
Of course the problem, for TV, was that the signal was not compatible
with the monochrome system (in either direction). That was, I believe, a
major reason for not using sequential colour systems.
Of course this doesn't apply for vector graphics displays, and thinking
about it, at least one vector display system did use a rotating colour
wheel on a spectacle-like frame in front of the useres eyes. Not only did
this give colour, but also a 3D effect (the wheel could blank off each
eye alternately so that you could have the 2 images of a stereo pair
viewed by each eye). The machine I am thinking of is, of course, the
Vectrex video game. The colour/3D spectacles are, alas, very hard to find.
-tony
Did anyone try using 3 monochrome CRTs and
combining the outputs
optically (e.g. by back projectuion)? That would get round the need for a
shadowmask
As Fred mentioned, projection TVs (I still see them), but convergence
was a headache. The fewer optics, the better. Better to use field-
sequential with a color wheel (as in the old CBS color TV system) as
various computer-to-film systems did.
If you've never seen one, the color on the old CBS system was quite
good--far better than the RCA shadowmask tubes of the time.