Patent ID: 8237347

Claim:
A field emission device, comprising: an insulative substrate; an electron pulling electrode located on a surface of the insulative substrate; a secondary electron emission layer located on a surface of the electron pulling electrode; a first dielectric layer, wherein the first dielectric layer has a second opening; a cathode electrode located apart from the electron pulling electrode by the first dielectric layer, wherein the electron pulling electrode is located between the insulative substrate and the cathode electrode, the cathode electrode has a surface oriented to the electron pulling electrode, and the cathode electrode has a first opening, the first opening and the second opening have at least one part overlapping; a gate electrode, wherein the gate electrode is located apart from and insulated from the cathode electrode by a second dielectric layer; a secondary electron enhancing electrode located between the second dielectric layer and the gate electrode and insulated from the gate electrode by a third dielectric layer; the secondary electron enhancing electrode has a fourth opening; an inner surface of the fourth opening is coated with a secondary electron emission material; and an electron emission layer located on the surface of the cathode electrode oriented to the electron pulling electrode.