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Article #4911Re: Life of LCD Panels
From: Isaac S Wingfield
Date: Sun, 01 Jul 1990 06:41
Date: Sun, 01 Jul 1990 06:41
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In article <1990Jun29.150402.6752@zoo.toronto.edu> henry@zoo.toronto.edu (Henr Spencer) writes: >However, 4000-series CMOS gates are pretty close to perfect for this. :-) >Still, the point is valid: even the slightest DC offset will eventually >degrade the LCD. Basically, it causes electrolytic reactions of various >kinds, as I recall. With a perfectly symmetrical AC wave, e.g. square >wave, reactions during one half of a cycle reverse themselves (you hope) >in the other half. If memory serves, it's simple electroplating that's the problem. Any voltage will cause one or the other of the tim oxide electrodes to migrate, but if the waveform is perfectly symmetrical, equal amounts move each way. With any DC component, however, eventually one electrode will vanish. Isaac isw@cup.portal.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!apple!portal!cup.portal.com!ISW From: ISW@cup.portal.com (Isaac S Wingfield) Newsgroups: sci.electronics Subject: Re: Life of LCD Panels Message-ID: <31306@cup.portal.com> Date: 1 Jul 90 06:41:56 GMT References: <25269@unix.cis.pitt.edu> <3922@memqa.uucp> <1990Jun29.150402.6752@zoo.toronto.edu> <25522@unix.cis.pitt.edu> Distribution: na Organization: The Portal System (TM) Lines: 18