Patent ID: 7030550
Filing Date: 2006-04-18
Classification: H01J

Abstract:
1. An electron emission device comprising: a gate electrode formed on a substrate via an insulating film; an emitter formed in a gate opening provided through said insulating film and said gate electrode; and an anode electrode disposed away from said emitter with a predetermined distance, wherein said gate electrode comprises at least two kinds of gate electrodes including a first gate electrode made of a first material and a second gate electrode formed closer to said anode electrode than said first gate electrode and made of a second material, and wherein the lateral cross-sectional area of the opening of said second gate electrode is larger than that of the opening of said first gate electrode continuously or discontinuously, and when a potential difference is provided between the gate electrode and the emitter, an upwardly protruding equipotential line in the direction from the emitter toward the anode electrode, and a downwardly protruding equipotential line protruding away from the anode electrode, are both formed near the first gate opening region.