6, 2005Nov 9, 2010Canon Kabushiki KaishaImage display apparatusUS7884537Feb 12, 2008Feb 8, 2011Ricoh Company, Ltd.Pattern substrate including conductive pattern of overlapping circular patterns disposed on substrateUS7911125Aug 25, 2006Mar 22, 2011Electronics And Telecommunications Research InstituteElectron emission device using abrupt metal-insulator transition and display including the sameEP10