Article View: uk.comp.os.win95
Article #236Re: Buying a monitor
From: Dave
Date: Sun, 07 Apr 2002 06:42
Date: Sun, 07 Apr 2002 06:42
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2687 bytes
On Sat, 06 Apr 2002 18:39:00 +0100, mike-barred@philomel.demon.co.uk (Mike) wrote some or all of: >Firstly, it's worth pointing out that visible light *IS* >electromagnetic radiation. good point! > >Secondly, LCD displays get their brightness by means of illumination >with miniature cold cathode fluorescent light tubes placed at the >sides of the LCD panel. The fluorescent light is diffused across the >screen by inclusion of a diffusion screen behind the LCD panel. The >LCD panel itself emits nothing, although some LCD technologies use a >very small magnetic field within the panel. It's just a mechanism for >filtering the transmission of light. > How does the magnetic field work? The only magnetic field I can think of is the stray magnetic field from the inverter circuit's transformer, used to step the voltage up to maybe 10KV. High frequency AC voltages of that order can burn neat little holes in your skin if you're careless with a live, dismantled screen. (Ouch!) Where I used to work, we always saved the little fluorescent tubes to repair other screens (in laptops). They're virtually unobtainable and consequently very expensive. regards Dave. 1173 free hi-res photos especially Edinburgh, Scotland. Quick navigation, plug-ins not needed. No banner adverts! http://www.henniker.org.uk
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1025cc,527906d56d6f1ea2 X-Google-Attributes: gid1025cc,public X-Google-Thread: 1036bc,527906d56d6f1ea2 X-Google-Attributes: gid1036bc,public X-Google-ArrivalTime: 2002-04-06 22:42:21 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!colt.net!easynet-quince!easynet.net!easynet-post2!monolith.news.easynet.net!not-for-mail From: Dave <dave@henniker.org.uk> Newsgroups: uk.comp.os.win95,demon.tech.pc Subject: Re: Buying a monitor Message-ID: <shqvau8vep3iq32b9akmuco4f6ofrp39tt@4ax.com> References: <iFNqp6HdTvY8Ewcx@pigsonthewing.org.uk> <3c64e25b.1311955@news.freeserve.net> <3kzP3ZIslPp8EwVn@soft255.demon.co.uk> <3ca9d811.1727036@news.freeserve.net> <VtGn$CAXvqq8EwYM@ch-w.demon.co.uk> <3cac7a63.1285057@news.freeserve.net> <poauau4aq6v6ljs9f1lvrfrbu61s5s9np6@4ax.com> X-Newsreader: Forte Agent 1.8/32.548 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 30 Date: Sun, 07 Apr 2002 07:42:25 +0100 NNTP-Posting-Host: 212.212.243.8 X-Complaints-To: abuse@easynet.net X-Trace: monolith.news.easynet.net 1018161739 212.212.243.8 (Sun, 07 Apr 2002 07:42:19 BST) NNTP-Posting-Date: Sun, 07 Apr 2002 07:42:19 BST Organization: [posted via Easynet]