Field emission electronic device

A field emission electronic device comprising:

• an insulating substrate having a surface;
• a plurality of row electrodes located on the surface of the insulating substrate, wherein the plurality of row electrodes is spaced apart from and parallel to each other;
• a plurality of line electrodes located on the surface of the insulating substrate, wherein the plurality of line electrodes is spaced apart from and parallel to each other, the plurality of row electrodes cross the plurality of line electrodes to form a plurality of lattices;
• a plurality of electron emitting units, wherein each of the plurality of electron emitting units is located in one respective lattice, each of the plurality of electron emitting units comprising:
• a first electrode connected to one corresponding row electrode;
• a second electrode connected to one corresponding line electrode and spaced from the first electrode;
• a cathode emitter connected to the first electrode, the cathode emitter comprising at least one carbon nanotube pipe, each of the at least one carbon nanotube pipe comprising a first end, a second end and a main body connecting the first end and the second end;
• wherein each of the first ends is electrically connected to the first electrode, and each of the second ends defines an opening and comprises a plurality of tapered carbon nanotube bundles located around the opening.

A field emission electronic device comprising:

• an insulating substrate;
• a first electrical conductor located on a surface of the insulating substrate;
• a plurality of electron emitters connected to the first electrical conductor, wherein each of the plurality of electron emitters comprises a carbon nanotube pipe, the carbon nanotube pipe has one end comprising a plurality of tapered carbon nanotube bundles, the plurality of tapered carbon nanotube bundles is located around an axis of the carbon nanotube pipe and spaced apart from each other to form a ring shape;
• and
• a second electrical conductor spaced apart from and insulated from the first electrical conductor.