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   From: "Rich Walsh"    
      
   On Sun, 22 May 2011 21:10:10 UTC, Dave Yeo  wrote:   
   > Doug Bissett wrote:   
   > > On Sun, 22 May 2011 14:55:06 UTC,tholen@antispam.ham  wrote:   
   > >   
   > >> >  but it doesn't save any power; just avoids burn-in.   
   > >> >   
   > > The ONLY reasons to use a "screen saver" since about 1990, is to blank   
   > > the screen so that others cannot read it, or to turn the power off   
   > > (more important, especially on laptops). "Burn in" is a thing of the   
   > > very distant past, and was never a problem with LCD screens.   
   >    
   > The bank machine I usually use shows clear burn in on its monitor.    
   > Probably running OS/2 as well.   
      
   LCDs don't get burn-in but they do suffer from "lazy pixels" which looks   
   very similar.  Each pixel relies on the liquid crystal to contort itself   
   in proportion to the strength of the electrical current that's applied.   
   If the crystaline substance is held in the same partially contorted state   
   for a long time, it may get "stiff" and fail to respond sufficiently to   
   the applied current.  The result looks like burn-in but isn't.  IIRC,   
   the cure is to have the monitor display a pure white surface for 12+   
   hours.  There's an article in Apple's knowledgebase that describes the   
   problem and solution in greater detail (other manufacturers probably   
   offer similar information).   
      
      
   --    
   == == almost usable email address:  Rich AT E-vertise DOT Com == ==   
      
      
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