Patent ID: 8241081

Claim:
A method for making a field emission cathode device, comprising the following steps: step (a), providing an insulative substrate, wherein the insulative substrate comprises a first surface and a second surface opposite to the first surface, and the insulative substrate defines one or more openings extending through from the first surface to the second surface; step (b), disposing at least one electron emitter corresponding to one of the one or more openings, wherein the at least one electron emitter comprises a fixing portion and an electron emission portion connected to the fixing portion, the fixing portion is fixed on the first surface, and the electron emission portion extends from the fixing portion into one of the one or more openings, wherein step (b) comprises the following substeps of: step (b 1 ), providing a field emission wire supply device that is configured for supplying a continuous field emission wire, wherein the field emission wire supply device comprises a hollow needle having a tip, the continuous field emission wire extends through the hollow needle, and one end of the continuous field emission wire extends out from the tip; step (b 2 ), inserting the hollow needle into each of the one or more openings in turn, and supplying the continuous field emission wire continuously at the same time so as the fixing portion of the continuous field emission wire to be fixed on the first surface and the electron emission portion of the continuous field emission wire to be located in one of the one or more openings; and step (b 3 ), severing the continuous field emission wire; and step (c), forming at least one cathode electrode on the first surface, wherein the fixing portion is located between the insulative substrate and the at least one cathode electrode.