Patent ID: 7554255
Filing Date: 2009-06-30
Classification: H01J

Abstract:
1. An electric field emission device having a triode structure fabricated by using an anodic oxidation process, comprising: a supporting substrate; a bottom electrode layer formed on the supporting substrate, which is used as a cathode electrode of the device; a gate insulating layer formed on the bottom electrode layer, the gate insulating layer having a plurality of first sub-micro holes to be used as gate holes of the device; a gate electrode layer formed on the gate insulating layer, the gate electrode layer having a plurality of second sub-micro holes each connecting to a corresponding one of the first sub-micro holes; an alumina layer formed on the gate electrode layer, the alumina layer having a plurality of third sub-micro holes each connecting to a corresponding one of the second sub-micro holes, wherein the alumina layer and the plurality of third sub-micro holes are formed by the anodic oxidation process; a top electrode layer for hermetically sealing the device in a vacuum, which is formed on the alumina layer and used as an anode of the device, wherein the top electrode layer is formed by depositing metal in a vacuum by employing one of electron beam deposition, thermal deposition, sputtering, low pressure chemical vapor deposition, sol-gel composition, electroplating and electoless plating; and a plurality of emitters for emitting electrons in a high electric field, each of the emitters being formed in a corresponding one of the first sub-micro holes.