I must confess that I did not study the article...
http://www.edn.com/article/CA6602447.html?spacedesc=designideas&industryid=44217&nid=2431&rid=1240235916
Mutliplexing technique yields a reduced-pin-count LED display - 
10/16/2008 - EDN
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Looking forward,
Al Shinn


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