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From: nott@royalt.enet.dec.com (Bill Nott)
Newsgroups: comp.periphs
Subject: Re: A question regarding monitor phosphors
Message-ID: <15677@shlump.nac.dec.com>
Date: 27 Sep 90 19:26:12 GMT
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Organization: Digital Equipment Corporation
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In article <3302@mindlink.UUCP>, a186@mindlink.UUCP (Harvey Taylor) writes...
> 
>    Does anybody have references to the various phosphors used in monitors?
> I often see in specs P22 or P34 phosphor used but have no real handle
> on what that means. Anybody got the facts?

   Of course they're well documented by CRT suppliers such as Clinton and
   Philips - but unless you're into designing with them, you probably
   don't have much reason to archive the information.  

   Differences include colors (white, green, amber, etc.), decay time,
   and efficiency.

   FWIW, P22 is a "standard" NTSC color phosphor - meaning what is normally
   used in consumer (and some/many monitor grade) color CRT's. P34 is a bit
   of a puzzle for me, as I don't have the complete JEDEC listing of 
   phosphor types registered (there are many which are not registered too).
   P4 is the commonly used white phosphor for monochrome TV sets, and has
   been used for many monochrome data and graphics displays until the recent
   popularity of "paper white" (of which there are many types).

   Hope this helps, though it's a bit sketchy.

   Bill