Patent ID: 7456565

Claim:
An image display apparatus, comprising: an electron emitting device disposed on a substrate, and an anode electrode disposed in opposition to the substrate, wherein the electron emitting device comprises, on a substrate, a cathode electrode comprising an electron emitting portion; an extraction electrode extracting electrons from the electron emitting portion, said extraction electrode applied with a voltage higher than the voltage of said cathode electrode; and a deflecting electrode deflecting the electrons extracted from said electron emitting portion, said deflecting electrode applied with a voltage lower than the voltage of said extraction electrode, wherein said extraction electrode is disposed between said cathode electrode and said deflecting electrode, wherein said deflecting electrode comprises a first portion opposed to said electron emitting portion, and second portions disposed to nip a region between said electron emitting portion and said first portion in a direction crossing the direction along which said first portion and said electron emitting portion are opposed, and wherein, assuming that the shortest distance between an intersection between a center line of an opening provided in said extraction electrode and a surface including an end portion, at the side of said deflection electrode, of said extraction electrode and an end portion, at the side of said electron emitting portion, of said first portion is taken as a, the shortest distance between said second portions is taken as b, the shortest distance between the end portion, at the side of said electron emitting portion, of said first portion and the surface including end portions, at the side of said extraction electrode, of said second portions is taken as c, a distance between said cathode electrode and said anode electrode is taken as h, a thickness of said extraction electrode is taken as p, a thickness of said deflecting electrode is taken as q, a voltage applied to said extraction electrode in relation to said cathode electrode is taken as Vg, a voltage applied to said deflecting electrode in relation to said cathode electrode is taken as Vf, and a voltage applied to said anode electrode in relation to said cathode electrode is taken as Va, in the case of 0≦Vf<Vg, when a ≧ hq Va ⁢ ( Vg + Vf ) ⁢ ⁢ and ⁢ ⁢ b ≦ 4 ⁢ a ⁢ ⁢ and ⁢ ⁢ c ≦ 4 ⁢ b ( Formula ⁢ ⁢ 1 ) are satisfied, and at the same time, in the case of Vf<0, a ≧ hp Va ⁢ ( Vg - Vf ) 2 ⁢ Vg ⁢ ⁢ and ⁢ ⁢ b ≦ 4 ⁢ a ⁢ ⁢ and ⁢ ⁢ C ≦ 4 ⁢ b ( Formula ⁢ ⁢ 2 ) and b≦4a and C≦4b (Formula 2) are satisfied.