Xref: utzoo rec.video:9571 misc.consumers:16106 comp.sys.ibm.pc:41230
Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!sjsca4!greg
From: greg@sj.ate.slb.com (Greg Wageman)
Newsgroups: rec.video,misc.consumers,comp.sys.ibm.pc
Subject: Re: Proton Monitors, Anyone?
Message-ID: <1990Jan4.201950.4972@sj.ate.slb.com>
Date: 4 Jan 90 20:19:50 GMT
References: <4880002@hpnmdla.HP.COM> <4880007@hpnmdla.HP.COM> <28450@amdcad.AMD.COM> <17854@umn-cs.CS.UMN.EDU> <28506@amdcad.AMD.COM> <534@sword.bellcore.com>
Reply-To: greg@sj.ate.slb.com (Greg Wageman)
Organization: Schlumberger ATE, San Jose, CA 95110
Lines: 38

Opinions expressed are the responsibility of the author.

In article <534@sword.bellcore.com> cyc2@sword.bellcore.com.UUCP (Jason Chen) writes:
>In article <28506@amdcad.AMD.COM> phil@diablo.AMD.COM (Phil Ngai) writes:
>
>>The readers of these groups may also be interested to know that at the
>>last Comdex there were a number of Taiwanese showing 19" VGA monitors.
>>They said they'd be cheaper than the 16" monitors that have been
>>available because they used TV tubes! 
>>
>This statement implies that monitor tubes are supposed to be
>different from TV tubes. I am not in this line of business, so I
>don't know for sure. But I always thought that the difference
>between a monitor and a TV is in the front end signal processing
>circuitry.  The tubes should be basically the same. Can anyone
>explain why they should be different? What is the disadvantage if you
>use TV tubes in monitors?

Color monitors intended for computer use generally have finer
dot-pitch than color television tubes.  "Dot pitch" is the distance
between the adjacent, discrete phosphor dots on the screen face.
(Recall that color tubes use triads of red, green, and blue dots.)  In
order to display a single white pixel, at least one dot of each color
must be illuminated by the electron beam, and ideally an exactly equal
area of each is illuminated.  Displaying areas of high detail and
contrast requires fine dot pitch to avoid blurring.  High-resolution
displays of 600 pixels or more are not possible with
television-quality CRT's, which are generally only required to display
half to a third as many vertical lines.

The phosphor on monochrome tubes is continuous, and except for
phosphor color and persistance factors in some tubes, is essentially
the same as a monochrome television tube.

Copyright 1990 Greg Wageman	DOMAIN: greg@sj.ate.slb.com
Schlumberger Technologies	UUCP:   {uunet,decwrl,amdahl}!sjsca4!greg
San Jose, CA 95110-1397		BIX: gwage  CIS: 74016,352  GEnie: G.WAGEMAN
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