Electron-emitting device and field emission display using the same

• US 20020153827A1
• Filed: 12/20/2001
• Published: 10/24/2002
• Est. Priority Date: 12/22/2000
• Status: Active Grant

• Current Assignee: NGK Insulators Limited
• Original Assignee: NGK Insulators Limited
• Inventors: Nanataki, Tsutomu, Horiuchi, Tomoya, Ohwada, Iwao, Takeuchi, Yukihisa
• Granted Patent: US 7,088,049 B2
• Time in Patent Office: Days
• US Class Current: 313/495
• CPC Class Codes: H01J 1/304 Field-emissive cathodes
• CPC Class Codes: H01J 1/316 having an electric field parallel to the surface, e.g. thin film cathodes
• CPC Class Codes: H01J 2201/306 Ferroelectric cathodes
• CPC Class Codes: H01J 2201/3165 Surface conduction emission type cathodes
• CPC Class Codes: H01J 31/127 using large area or array sources, i.e. essentially a source for each pixel group

Abstract

An electron-emitting element includes an electric field applying portion composed of a dielectric, a first electrode formed on one surface of the electric field applying portion, and a second electrode being formed on the surface and forming a slit in cooperation with the first electrode, and is formed on a substrate.

Claims

1. An electron-emitting element comprising:

an electric field applying portion composed of a dielectric;

a first electrode formed on one surface of this electric field applying portion; and

a second electrode formed on said one surface of the electric field applying portion, and forming a slit in cooperation with said first electrode.

2. An electron-emitting element according to claim 1, wherein a carbon coating is applied to said first electrode, said second electrode and said slit.

3. An electron-emitting element according to claim 1 or 2, further comprising a third electrode arranged at a certain space to said first and second electrodes, wherein space between said first and second electrodes and said third electrode is vacuum.

8. An electron-emitting element according to one of claims 3, 6 and 7, further comprising:

a voltage source for applying a direct offset voltage to said third electrode; and

a resistor arranged in series between this voltage source and said third electrode.

9. An electron-emitting element according to one of claims 1 to 8, wherein a pulse voltage is applied to said first electrode and a direct offset voltage is applied to said second electrode.

10. An electron-emitting element according to one of claims 1 to 9, further comprising a capacitor arranged in series between said first electrode and said voltage source.

11. An electron-emitting element according to one of claims 1 to 8, further comprising a fourth electrode formed on the other surface of said electric field applying portion and facing to said first electrode.

12. An electron-emitting element according to claim 11, wherein a pulse voltage is applied to said fourth electrode and a direct offset voltage is applied to said second electrode.

13. An electron-emitting element according to one of claims 1 to 12, further comprising a resistor arranged in series between said second electrode and a direct offset voltage source.

14. An electron-emitting element according to one of claims 1 to 13, wherein said electric field applying portion has the relative dielectric constant not less than 1000.

15. An electron-emitting element according to one of claims 1 to 14, wherein said slit has the width not more than 500 μ

m.

16. An electron-emitting element according to one of claims 1 to 15, wherein at least one of said first electrode and said second electrode has an angular part with an acute angle.

17. An electron-emitting element according to one of claims 1 to 16, wherein said first electrode and said second electrode each have carbon nanotubes.

19. A field emission display according to claim 18, wherein a carbon coating is applied to said first electrode, said second electrode and said slit.

20. A field emission display according to claim 18 or 19, wherein a third electrode is arranged on the opposite surface to a surface of each of said phosphors facing said first and second electrodes, and the space between said first and second electrodes and said phosphor is vacuum.

25. A field emission display according to one of claims 20, 23 and 24, wherein each of said electron-emitting elements comprises:

a voltage source for applying a direct offset voltage to said third electrode; and

a resistor arranged in series between this voltage source and said third electrode.

4. An electron-emitting element comprising:

an electric field applying portion composed of at least one of a piezoelectric material, an electrostrictive material and an antiferroelectric material;

a first electrode formed on one surface of this electric field applying portion; and

a second electrode formed on said one surface of the electric field applying portion, and forming a slit in cooperation with said first electrode.

5. An electron-emitting element according to claim 4, wherein a carbon coating is applied to said first electrode, said second electrode and said slit.

6. An electron-emitting element according to claim 4 or 5, further comprising a third electrode arranged at a certain space to said first and second electrodes, wherein space between said first and second electrodes and said third electrode is vacuum.

7. An electron-emitting element according to claim 6, wherein said electric field applying portion also acts an actuator and controls the quantity of emitted electrons by the displacement motion of said electric field applying portion.

18. A field emission display comprising:

a plurality of electron-emitting elements arranged in two dimensions; and

a plurality of phosphors each being arranged with a certain space to each of these electron-emitting elements,

each of said electron-emitting elements having;

an electric field applying portion made of a dielectric;

a first electrode formed on one surface of this electric field applying portion; and

a second electrode formed on said one surface of the electric field applying portion, and forming a slit in cooperation with said first electrode.

26. A field emission display according to one of claims 18 to 25, wherein a pulse voltage is applied to said first electrode and a direct offset voltage is applied to said second electrode.

27. A field emission display according to one of claims 18 to 26, wherein each of said electron-emitting elements further comprises a capacitor arranged in series between said first electrode and said voltage signal source.

28. A field emission display according to one of claims 18 to 26, wherein each of said electron-emitting elements further comprises a fourth electrode being formed on the other surface of said electric field applying portion and opposite to said first electrode.

30. A field emission display according to one of claims 18 to 29, wherein each of said electron-emitting elements further comprises a resistor arranged in series between said second electrode and said direct offset voltage source.

31. A field emission display according to one of claims 18 to 30, wherein said electric field applying portion has the relative dielectric constant not less than 1000.

32. A field emission display according to one of claims 18 to 31, wherein said slit has the width not more than 500 μ

m.

33. A field emission display according to one of claims 18 to 32, wherein at least one of said first electrode and said second electrode has an angular part with an acute angle.

34. A field emission display according to one of claims 18 to 33, wherein said first electrode and said second electrode each have carbon nanotubes.

35. A field emission display according to one of claims 18 to 34, further comprising a substrate having a plurality of electron-emitting elements arranged in two dimensions and formed into one body with each other.

21. A field emission display comprising:

a plurality of electron-emitting elements arranged in two dimensions; and

a plurality of phosphors each being arranged with a certain space to each of these electron-emitting elements,

each of said electron-emitting elements having;

an electric field applying portion composed of at least one of a piezoelectric material, an electrostrictive material and an antiferroelectric material;

a first electrode formed on one surface of this electric field applying portion; and

a second electrode formed on said one surface of the electric field applying portion, and forming a slit in cooperation with said first electrode.

22. A field emission display according to claim 21, wherein a carbon coating is applied to said first electrode, said second electrode and said slit.

23. A field emission display according to claim 21 or 22, wherein a third electrode is arranged on the opposite surface to a surface of each of said phosphors facing said first and second electrodes, and the space between said first and second electrodes and said phosphor is vacuum.

24. A field emission display according to claim 23, wherein said electric field applying portion also acts as an actuator and controls the quantity of emitted electrons by the displacement motion of said electric field applying portion.

29. A field emission display according to claim 28, wherein a pulse voltage is applied to said fourth electrode and a direct offset voltage is applied to said second electrode.