Patent ID: 7372193
Filing Date: 2008-05-13
Classification: H01J

Abstract:
1. A cold cathode light emitting device emitting light by electrons extracted from a cold cathode, comprising: a plurality of cathode electrodes; a plurality of insulating layers laminated over said plurality of cathode electrodes; a plurality of gate electrodes provided on said plurality of insulating layers to intersect said plurality of cathode electrodes with said plurality of insulating layers interposed therebetween, for extracting electrons from said plurality of cathode electrodes; an anode electrode opposed to said plurality of gate electrodes for emitting light upon receipt of said electrons, with a voltage for accelerating said electrons being applied between said anode electrode and said plurality of cathode electrodes; at least one hole provided at each intersection of said plurality of cathode electrodes and said plurality of gate electrodes extending through said plurality of gate electrodes and said plurality of insulating layers to reach a surface of said plurality of cathode electrodes, said at least one hole having a first diameter at a position where a first of said plurality of insulating layers contacts said plurality of cathode electrodes and a second diameter at a position of said plurality of gate electrodes, where the second diameter is greater than the first diameter; and a nanofiber-structure layer provided on said plurality of cathode electrodes in an opening portion corresponding to said first diameter in said at least one hole, wherein said at least one hole is divided into a first section corresponding to a lowermost insulating layer of said plurality of insulating layers being in contact with said plurality of cathode electrodes, a second section corresponding to the remainder of said plurality of insulating layers located over said lowermost insulating layer, and a third section corresponding to said plurality of gate electrodes; and said first diameter is in said first section, and said second section includes a diameter which decreases to taper toward said plurality of gate electrodes.