Patent ID: 6407499
Filing Date: 2002-06-18
Classification: C23C,Y10T

Abstract:
A field emission display (FED) constructed from a process comprising:depositing a conductive thin film layer on a substrate in which the thin film layer has at least one surface protrusion; covering the thin film layer with an insulating sacrificial layer having a top surface; using chemical-mechanical planarization to remove a portion of the sacrificial layer from the top surface until the sacrificial layer has a thickness D to thereby expose on the top surface all surface protrusions having a height of at least D; etching the surface protrusions from the thin film layer through the exposed portions of any such protrusions to form void spaces at the location of the surface protrusions, the void spaces being present within the thin film layer and the sacrificial layer; etching the sacrificial layer to remove the sacrificial layer from the thin film layer to expose an upper surface of the thin film layer having void spaces distributed therein; constructing emitters on an upper surface of the thin film layer; forming a layer of insulating material above the thin film layer; forming an extraction grid on the layer of insulating material above the emitters; and constructing a transparent screen above the extraction grid, the screen having an anode and a cathodoluminescent coating on the anode facing the extraction grid.