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From: osmoviita@cc.helsinki.fi
Newsgroups: comp.windows.ms
Subject: Re: Interlaced monitors
Message-ID: <1991Mar17.133441.5573@cc.helsinki.fi>
Date: 17 Mar 91 13:34:41 GMT
References: <6919@mace.cc.purdue.edu> <1991Mar6.174932.14469@cbnews.att.com> <70457004@bfmny0.BFM.COM> <1991Mar15.023840.28733@rti.rti.org> <1540@aupair.cs.athabascau.ca>
Organization: University of Helsinki
Lines: 31

In article <1540@aupair.cs.athabascau.ca>, kevinc@cs.athabascau.ca (Kevin Crock
er) writes:
> 
> Almost all monitors have flicker to me because of my sensitivity to the
> edges of all the various video tests.  
> 
> Right now I'm running a 21" Taxan with a scan rate up around 78kHz (I
> hope I remembered that right) and a video card that can put out a
> signal for non-interlaced 1280x1024 by 256.  I can still see flicker
> and refresh.  What I can't see is the edges of all these wonderful
> windows on my screen so I end up clicking on the wrong thing all the
> time.  I doubt if there are many netters that can still see flicker on
> something equivalent to what I'm using.
> 

Highest reported seen flicker frequency is about 106 Hz, and my fried saw
up to 104 Hz. It shown that brain cells of apes react up to 120 Hz flicker.
So if you want to be sure to avoid flicker buy Barco Calibrator monitor
which syncs up to 120 Hz or Ikegami's one which syncs up to 150 Hz. (Barco
is about best quality available and not very cheap). More difficult is to
find a graphics card which puts images out at those rates. Then if You show
images at 120 Hz and AC frequency is 60 Hz there should not bee visible
interference with rooms lights. But of course You get lower resolution.
Non-interlaced. In workstations there is often a 120 Hz stereo mode. But it
is interlaced. So although it is very stable for periferic seeing where
flicker is most easily seen there is a small flicker between line pairs
where You focuse. I rated 120 Hz interlaced 1280x1024 at 19" tube better
than 60 Hz non-interlaced. That was based only on a short inspection, I
don' know how it would disturb after hours.

Kari Osmoviita