Patent ID: 8164247

Claim:
An electron emitting element comprising: an electrode substrate and a thin-film electrode which are provided so as to face each other; and an electron acceleration layer sandwiched between the electrode substrate and the thin-film electrode, as a result of a voltage applied between the electrode substrate and the thin-film electrode, electrons being accelerated in the electron acceleration layer so as to be emitted from the thin-film electrode, wherein: the electron acceleration layer includes a fine particle layer containing at least insulating fine particles, and Ie=α·R −0.67 where Ie [A/cm 2 ] is electron emission current per unit area during voltage application and R is element resistance [Ω·cm 2 ] per unit area, the element resistance being obtained by dividing (a) the voltage applied between the electrode substrate and the thin-film electrode during the voltage application by (b) current in element per unit area which current flows between the electrode substrate and the thin-film electrode during the voltage application, and where α is not less than 2.0×10 −6 , and the electron emission current Ie is not less than 1.0×10 −9 .