Patent ID: 8110975

Claim:
A field emission device, comprising: an insulating substrate; and one or more grids located on the insulating substrate, wherein each grid comprises: a first, second, third and fourth electrode down-leads located on a periphery of the each grid, the first and the second electrode down-leads being parallel to each other, the third and the fourth electrode down-leads being parallel to each other; and an electron emitting unit comprising a first electrode, a second electrode and at least one electron emitter comprising a plurality of carbon nanotube segments joined end to end by van der Waals attractive force, the first electrode being electrically connected to the first electrode down-lead, and the second electrode being electrically connected to the third electrode down-lead; wherein one end of each electron emitter is connected to the second electrode, and an opposite end of the each electron emitter is spaced from the first electrode by a predetermined distance.