Electron emission element and image output device

摘要

An electron emission element of the present invention includes a substrate 11, a cathode 12 formed on the substrate 11, an anode 13 opposed to the cathode 12, an electron emission member 14 disposed on the cathode 12, and a control electrode 15 disposed between the cathode 12 and the anode 13. During operation, the electric field intensity immediately above the electron emission member 14 is lower than that between the control electrode 15 and the anode 13. Alternatively, the spatial average of an electric field intensity between the electron emission member 14 and the control electrode 15 is smaller than that between the control electrode 15 and the anode 13.