"Paul Hovnanian P.E." wrote in message
...
ian field wrote:

"James Sweet" wrote in message
news:cXXyg.1723$8v.1366@trnddc05...
h wrote:
As per subject. My other old CRTs go dim but all the trinitron ones go
green. Is there a simple explanation?

Cheers,

h


The green phosphor tends to be the most efficient, if you've ever seen
a
green fluorescent tube you'll see what I mean, the green is about 2x as
bright as the blue and many times brighter than the red.

Either that or the human eye is most sensitive at the green wavelength.

Or there's something about the color modulation that, with aging
components, causes the signal to drift toward green. I have an LCD (3"
screen) color TV that is about 10 years old. When driven from a
composite video input (from a DVD player) it looks fine. But the
broadcast signals are starting to look a bit green.

--
Paul Hovnanian
------------------------------------------------------------------
Stupidity kills. But not nearly often enough.

Not sure if NTSC works the same but the PAL system only recovers R-L & B-L
from the transmitted carrier, green is recovered by working out its
amplitude from the sum of the R & B signals subtracted from the luma signal.