Patent ID: 8237344

Claim:
An electron emission apparatus comprising: an insulating substrate; one or more grids located on the substrate, wherein the one of the one or more grids comprises: a first electrode, a second electrode, a third electrode, and a fourth electrode located on the a periphery of the grid, wherein the first and the second electrodes are parallel to each other, and the third and fourth electrodes are parallel to each other; at least one fixed element being located on a top of at least one of the first electrode and the third electrode; and an electron emission unit, the electron emission unit comprising at least one electron emitter, the at least one electron emitter comprising a first end, electrically connected with the first electrode, and a second end, electrically connected with the third electrode; and a gap is defined between the first end and the second end; and two electron emission portions are located in the gap, wherein each of the two electron emission portions comprises one electron emission tip, and each of the two electron emission portions comprises a carbon nanotube wire comprising a plurality of carbon nanotubes, the at least one fixed element fixes the at least one electron emitter, the at least one electron emitter is sandwiched by the at least one fixed element and the at least one of the first electrode and the third electrode.