Patent attributes
An electron emission device comprises first and second substrates facing each other and separated from each other by a distance. First and second electrodes are positioned on the first substrate such that the first and second electrodes are insulated from each other. Electron emission regions are positioned on the first substrate and are electrically connected to at least one of the first and second electrodes. An insulating layer covers the first and second electrodes. A focusing electrode is positioned on the insulating layer. The focusing electrode includes openings to allow passage of electron beams. The focusing electrode comprises a first layer having a first thickness, a second layer beneath the first layer and a third layer surrounding the first layer. The second and third layers are electrically connected and have second and third thicknesses smaller than the first thickness.
