Update: Digitimes posted a full list of earthqake effects on Japanese OLED plants and facilities.
According to Digitimes, the Japanese earthquake did not have a serious impact on OLED companies. The only company that was really hit was Showa Denko - and while it's not clear from the article is seems that the damage is not substantial. Sumitomo's PLED production saw some 'modest' disruption as well.
Idemitsu Kosan was only effected by the transportaion and power outrages. It's not clear how did TDK (who makes PMOLED panels) fare.
Posted: Mar 22,2011 by Ron Mertens