Field effect electron source and process for producing said source and application to display means by cathodoluminescence

摘要

A field effect electron source includes a grid electrode formed over an insulating layer that covers a cathode electrode formed on an insulating substrate. Holes are provided in the grid electrode-insulating layer structure, the holes extending to the cathode electrode formed on the insulating substrate. Electron emitting microheaps are formed within the holes above the exposed portions of the cathode electrode on the substrate. These microheaps each include at least a macropile of carbon diamond or diamond like carbon powder grains surrounded by the sidewalls of the hole.