Patent ID: 8339027

Claim:
A field emission device, comprising: an insulating substrate; a plurality of first electrode down-leads substantially parallel to each other and located on the insulating substrate; a plurality of second electrode down-leads substantially parallel to each other and located on the insulating substrate, wherein the plurality of first electrode down-leads is set an angle relative to the plurality of second electrode down-leads to define a grid having a plurality of cells and a plurality of intersections; and a plurality of electron emission units, wherein each of the plurality of electron emission units is positioned at one of the plurality of intersections and in at least two adjacent cells, and each of the plurality of electron emission units comprises: a first electrode located on the insulating substrate; a second electrode located on the insulating substrate and spaced from the first electrode, wherein the second electrode extends surrounding the first electrode; and a plurality of electron emitters located on and electrically connected to at least one of the first electrode and the second electrode.