🚀 go-pugleaf

>Since then I have come to the conclusion from hanging out here, that this
>horozontal non-linearity is a design compromise just like the visible wires in
>all Trinitron type screens.  The Mitubishi tube in your Iiyama Pro is a tube
>of this type.
>
>I think Iiyama is a quality company.  I will be driving an hour to look at a
>standard Iiyama 17 with a standard Hitachi made tube.  I want straight,
>parallel top and bottom edges.  I want extensive adjustments.  I want
>acceptable brightness, contrast.
>
I find it hard to believe that this sort of gross horizontal linearity
is not correctable in the design, since all that is happening is that
the linear scan rate is changing across the screen.  In the old days,
with curved screens, the constant angular scan rate produced a constant
linear scan rate on the curved screen.  But these days all flat screen
monitors need a variable angular scan rate to produce the constant
linear rate on the screen.  The waveform required produce this linear
scan is relatively simple to generate, especially these days.

What is incredible about the Iiyama is that the vertical linearity (and
the trinitron / diamondtron screen is perfectly flat in that axis) is
almost perfectly corrected.  The distortion is only on the horisontal
axis, which is actually curved around the electron source.

Although you may have been led to believe that this is a compromise on
these screens which is impossible to prevent I can assure you that this
is utter bunkum.  At work I have several Silicon Graphics workstations,
about 5 of which have 17 and 21in trinitron screens - very similar to
the Iiyama devices.  Having noted the distortion on my screen I spent
the last few lunchtimes checking each of these screens in detail.  They
all have virtually perfect geometry - no distortion (if there is any it
is less than 1%, estimated using the critical moire fringe test) and
certainly no convergence mismatches.  Whether they have the same colour
purity as the Iiyama is difficult to assess, since the lighting
conditions are so different at work and home, but they look very
similar.

It is possible to make a perfect geomtry trinitron type screen - Silicon
Graphics do it, why can't Iiyama?
-- 
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
Python Philosophers