Flat display panel having spacers

摘要

A vacuum envelope capable of preventing contamination of an electron source and deterioration of luminous characteristics of a phosphor layer. Electrons emitted from a tip end of emitter cones are accelerated by an anode conductor to which a positive voltage is applied with respect to a gate conductor, to thereby impinge on the phosphor layer, leading to luminescence of the layer. The luminescence is observed through a transparent anode substrate. Spacers are bonded at only one end thereof to a cathode substrate by means of seal glass, to thereby keep the seal glass from being irradiated with electrons.