20-inch　printable　Monochrome.　field　emission　display　(FED)　prototype　was　developed.　The　FED　panel　was　fabricated　by　using　thin　film　sputtering,　screen　printing,　and　cathode　activation　technologies.　The　cathode　of　FED　prototype　was　activated　with　low　work　function　materials.　The　activation　process　could　effectively　lower　the　work　function　of　the　cathode　surface　and　therefore　dramatically　increased　the　electron　number　emitted　from　the　cathode.　That　is,　low　work　function　material　could　be　an　important　candidate　for　the　cold　cathode　to　develop　second　generation　FEDs.　The　prototype　thus　fabricated　could　show　video　images　and　moving　pictures.　In　this　paper,　the　characteristics　of　the　cathode　and　panel　were　also　described.