Patent ID: 7078863

Claim:
A cold-cathode electron source comprising a gate formed on a substrate via an insulating layer, and an emitter disposed at a gate opening portion provided through the insulating layer and the gate, the electron source satisfying, when electrons are emitted by the emitter: 10 [V/μm]≧( Va−Vg )/( Ha−Hg )≧ Vg/Hg; and Vg/Hg [V/μm]≧ Va× 10 −4 ×(9.7−1.3×1 n ( Hg ))×(1000/ Ha ) 0.5 where Ha [μm] is an anode-emitter distance, Va [V] is an anode-emitter voltage, Hg [μm] is a gate-emitter distance, and Vg [V] is a gate-emitter voltage.