Patent ID: 7196463

Claim:
An emissive flat panel display device comprising: a back panel which includes a plurality of cathode electrodes which extend in the first direction and are arranged in the second direction which intersects the first direction and has a large number of electron sources made of nanotubes, and a plurality of gate electrodes which extend in the second direction and are arranged in parallel in the first direction with respect to the cathode electrodes by way of an insulation layer and controls fetching of electrons from the electron sources, wherein a display region is constituted of a large number of pixels which are formed on intersecting portions between the cathode electrodes and the gate electrodes, and a face panel which includes phosphor layers of a plurality of colors which emit light upon excitation of electrons fetched from the electron sources formed on the display region of the back panel and anode electrodes, wherein an average density of the nanotubes having a diameter ranging from the minimum diameter to a diameter which is 1.2 times as large as the minimum diameter in emission regions of the pixels is ten million pieces/cm 2 or more.