An electron emission device comprises an electron-supply layer made of metal or semiconductor and disposed on an ohmic electrode; an insulator layer formed on the electron-supply layer; and a thin-film metal electrode formed on the insulator layer. The electron-supply layer has a rectifier function layer,...http://www.google.se/patents/US6404124?utm_source=gb-gplus-sharePatent US6404124 - Electron emission device and display apparatus using the same
