Electron emission decvice

摘要

An electron emission device includes i) a substrate (10), ii) a cathode electrode (16) on the substrate, having a first opening (1611), and comprising an ultraviolet non-transmitting material, iii) an electron emission region (30) in the first opening (1611) and for emitting electrons, and iv) a gate electrode (20) electrically insulated from the cathode electrode and having a second opening (201) through which the electrons emitted from the electron emission region pass. The ultraviolet transmittance of the gate electrode is about 30% or more. A distance between a first imaginary line (C1) passing through a center of the electron emission region and normal to a plane surface of the substrate, and a second imaginary line (C2) passing through a center of the second opening and normal to the plane surface of the substrate is about 0.5 µm or less.