Patent ID: 8246413

Claim:
A method for making a field emission device, comprising: providing an insulative substrate; forming an electron pulling electrode on the insulative substrate; forming a secondary electron emission layer on the electron pulling electrode; fabricating a first dielectric layer, wherein the first dielectric layer has a second opening to expose the secondary electron emission layer; supplying a cathode plate having an electron output portion; forming an electron emission layer on a part of a surface of the cathode plate, wherein the electron emission layer is made by: applying a carbon nanotube slurry layer on the cathode electrode; drying the carbon nanotube slurry layer in a temperature of about 300° C. to about 400° C.; baking the carbon nanotube slurry layer in a temperature of about 400° C. to about 600° C.; cooling the carbon nanotube slurry layer; and coating a protective layer made of anti-ion bombardment materials selected from the group consisting of zirconium carbide, hafnium carbide, lanthanum hexaborid, and combinations thereof, after cooling the carbon nanotube slurry; and placing the cathode plate on the first dielectric layer, wherein the electron output portion and the second opening have at least one part overlapped, and at least one part of the electron emission layer is oriented to the secondary electron emission layer via the second opening.