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From: barry@network.ucsd.edu (Barry Brown)
Newsgroups: comp.sys.mac.hardware
Subject: Re: hairlines a common monitor fault?
Message-ID: <2530@network.ucsd.edu>
Date: 9 Jun 90 05:18:30 GMT
References: <1990Jun8.192304.4492@isis.educ.lon.ac.uk> <1990Jun8.230821.23506@Neon.Stanford.EDU>
Organization: University of California, San Diego
Lines: 29

In article <1990Jun8.230821.23506@Neon.Stanford.EDU> philip@pescadero.stanford.edu writes:
>In article <1990Jun8.192304.4492@isis.educ.lon.ac.uk>, tejtemw@isis.educ.lon.ac.uk (EARL WILLIAMS) writes:
>> Are visible horizontal hairlines in large-screen monitors just a fact of
>> life that we have to live with?  Every monitor I've installed or seen seems
>> to have 1-3 of these super-thin but sometimes distracting lines.  The
>> vertical location varies, but there is most often one about 1/3 of the way
>> up from the bottom.

>If this makes you feel any better, I've also seen the lines on a RasterOps
>19" and and Apple 13" color monitor. I don't think it's a fault, but
>I've forgotten the explanation.

The mask inside a Trinitron tube is made of a vertical array of VERY thin
wires.  Since the tube heats up as it gets used, there is a tendency for
the wire to warp a bit.  Given the high resolution of the monitor, this
would degrade the quality.  So two horizontal wires were installed --
one 1/3 of the way from the top and one 1/3 of the way from the bottom --
to steady the mask.  (The top one isn't as visible probably because of the
way the scan lines work out.)  There is nothing you can do about them and
needless to say that removing them would be a bad idea.

This, I presume, is one of the two prices you pay for the luxury of the
Trinitron (the other being of a monetary sort).

-- 
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