An electron emission device exhibits a high electron emission efficiency. The device includes an electron supply layer of metal or semiconductor, an insulator layer formed on the electron supply layer, and a thin-film metal electrode formed on the insulator layer. The insulator layer is formed by oxidation...http://www.google.com/patents/US6144155?utm_source=gb-gplus-sharePatent US6144155 - Electron emission device and display device using the same
