Patent ID: 8446087

Claim:
A field emission cathode structure comprising: an insulating substrate; a plurality of strip cathode electrodes located on the insulating substrate, the plurality of strip cathode electrodes being spaced apart from and substantially parallel to each other; a plurality of insulators located on the insulating substrate; a plurality of strip gate electrodes substantially perpendicular to the plurality of strip cathode electrodes, the plurality of strip gate electrodes being spaced apart from each other, supported by the plurality of insulators, and spaced apart from the plurality of strip cathode electrodes by the plurality of insulators; a plurality of electron emission units located at intersections of the plurality of strip cathode electrodes and the plurality of strip gate electrodes, the plurality of electron emission units being electrically connected to the plurality of strip cathode electrodes; and a plurality of fixing layers located on surfaces of the plurality of strip gate electrodes, the plurality of strip gate electrodes being sandwiched by the plurality of fixing layers and the plurality of insulators; wherein the condition D 1 ≦D 2 /10 is satisfied, wherein D 1 is a width of each of the insulators and D 2 is a distance between centerlines of each two adjacent field emission units.