Patent ID: 6140760
Filing Date: 2000-10-31
Classification: B82Y,H01J

Abstract:
A display device including a cathode device and an anode device receiving electrons emitted from the cathode device, the cathode device comprising:a substrate;at least one emitter tip formed on the substrate and having a conical tip end portion; anda gate electrode layer formed above the substrate and having an opening through which the tip end portion of the emitter tip is exposed;wherein a diameter of the opening of the gate electrode layer is smaller than that of a portion of the emitter tip at a juncture thereof with the substrate, wherein an inner circumferential wall of the opening of the gate electrode layer has a surface extending at least partly opposite to and approximately parallel with the conical tip end portion of the emitter tip, and surrounding the conical tip end portion of the emitter tip, wherein a width of the inner circumferential wall of the opening of the gate electrode layer is larger than a thickness of the gate electrode layer, and wherein a lowest point of the inner circumferential wall of the opening is below a lower surface of a portion of the gate electrode layer adjacent the opening.