Method for making field emission cathode device

A method for making a field emission cathode device, comprising:

• 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), forming a plurality of strip-shaped gate electrodes on the second surface;
• step (c), disposing at least one electron emitter into 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 the one of the one or more openings, and wherein step (c) is performed after step (b);
• step (d), forming at least one strip-shaped cathode electrodes on the first surface, the fixing portion is located between the insulative substrate and the at least one cathode strip-shaped electrode.