Article View: comp.sys.mac
Article #25425Re: SCREENS HURT EYES (Mac SE, Plus)
From: Paul Dietz
Date: Thu, 18 Feb 1988 16:47
Date: Thu, 18 Feb 1988 16:47
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In article <3720@ihlpf.ATT.COM> straka@ihlpf.UUCP (55223-Straka,R.J.) writes: >Higher brightness levels naturally increase the perceived flicker >on the display. I wasn't too sure about this statement, so I decided to do some checking. According to Cornsweet, "Visual Perception", for high frequencies "what determines wether or not the the fluctuation will be seen is the absolute amplitude of the flucuation, not the level around which it is fluctuating." If the phosphur is fairly linear, then the original statement is absolutely correct. However, if it saturates, it could well be that there is a brightness level which is maximally bad, and either increasing, or decreasing the brightness would help. Does anybody out there know anything about the physics of CRT's? Paul H. Dietz ____ ____ Dept. of Electrical and Computer Engineering / oo \ <_<\\\ Carnegie Mellon University /| \/ |\ \\ \\ -------------------------------------------- | | ( ) | | | ||\\ "If God had meant for penguins to fly, -->--<-- / / |\\\ / he would have given them wings." _________^__^_________/ / / \\\\-
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arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!amdcad!ames!ll-xn!mit-eddie!uw-beaver!cornell!rochester!PT.CS.CMU.EDU!SPEECH1.CS.CMU.EDU!phdReferences:
<1767@batcomputer.tn.cornell.edu> <993@ski.UUCP> <3645@batcomputer.tn.cornell.edu> <3402@sphinx.uchicago.edu> <699@pasteur.Berkeley.Edu> <3720@ihlpf.ATT.COM>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!amdcad!ames!ll-xn!mit-eddie!uw-beaver!cornell!rochester!PT.CS.CMU.EDU!SPEECH1.CS.CMU.EDU!phd From: phd@SPEECH1.CS.CMU.EDU (Paul Dietz) Newsgroups: comp.sys.mac Subject: Re: SCREENS HURT EYES (Mac SE, Plus) Message-ID: <893@PT.CS.CMU.EDU> Date: 18 Feb 88 16:47:22 GMT References: <1767@batcomputer.tn.cornell.edu> <993@ski.UUCP> <3645@batcomputer.tn.cornell.edu> <3402@sphinx.uchicago.edu> <699@pasteur.Berkeley.Edu> <3720@ihlpf.ATT.COM> Sender: netnews@PT.CS.CMU.EDU Organization: Carnegie-Mellon University, CS/RI Lines: 23 Keywords: screens, screen, hurt, eyes, Clinton Taiwan Corp.