Electron emitter, method of driving electron emitter, display and method of driving display

• US 6,946,800 B2
• Filed: 02/25/2003
• Issued: 09/20/2005
• Est. Priority Date: 02/26/2002
• Status: Expired due to Fees

• Current Assignee: NGK Insulators Limited
• Original Assignee: NGK Insulators Limited
• Inventors: Takeuchi, Yukihisa, Nanataki, Tsutomu, Ohwada, Iwao, Kokune, Nobuyuki, Horiuchi, Tomoya
• Primary Examiner(s): Philogene, Haissa
• Application Number:
  US10/374,955
• Publication Number:
  US 20040100200A1
• Time in Patent Office: 938 Days
• Field of Search: 315/169.1, 315/169.3, 315/291, 315/301, 315/297, 315/307, 313/311, 313/414, 313/447, 313/448, 313/491, 313/495, 313/497, 345 741- 752
• US Class Current: 315/169.3
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2330/04 Display protection
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/22 using controlled light sources
• 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 2329/00 Electron emission display panels, e.g. field emission display panels

Abstract

An electron emitter has an electric field receiving member formed on a substrate, a cathode electrode formed on one surface of the electric field receiving member, and an anode electrode formed on the one surface of the electric field receiving member, with a slit defined between the cathode electrode and the anode electrode. The electric field receiving member is made of a dielectric material. The electron emitter also has a modulation circuit for modulating a pulse signal applied between the cathode electrode and the anode electrode based on a control signal supplied from a controller such as a CPU to control at least an amount of emitted electrons.

Claims

1. An electron emitter comprising:

an electric field receiving member made of a dielectric material;

a cathode electrode formed on one surface of said electric field receiving member;

an anode electrode formed on said one surface of said electric field receiving member, with a slit defined between said cathode electrode and said anode electrode; and

a modulation circuit for modulating a voltage signal applied between said cathode electrode and said anode electrode to control at least an amount of emitted electrons.

2. An electron emitter according to claim 1, further comprising a collector electrode for trapping said emitted electrons, wherein a positive bias voltage with respect to said anode electrode is applied to said collector electrode to accelerate said emitted electrons.

3. An electron emitter according to claim 1, wherein said electric field receiving member is made of a piezoelectric material, an anti-ferrodielectric material, or an electrostrictive material.

4. An electron emitter comprising:

an anode electrode formed on a substrate;

an electric field receiving member formed on said substrate to over said anode electrode and made of a dielectric material;

a cathode electrode formed on said electric field receiving member; and

a modulation circuit for modulating a voltage signal applied between said cathode electrode and said anode electrode to control at least an amount of emitted electrons.

5. An electron emitter according to claim 4, wherein said electric field receiving member is made of a piezoelectric material, an anti-ferrodielectric material, or an electrostrictive material.

6. An electron emitter comprising:

an anode electrode formed on a substrate;

an electric field receiving member formed on said substrate to cover said anode electrode and made of a dielectric material;

a cathode electrode formed on said electric field receiving member;

a modulation circuit for modulating a voltage signal applied between said cathode electrode and said anode electrode to control at least an amount of emitted electrons; and

a collector electrode for trapping said emitted electrons, wherein a positive bias voltage with respect to said anode electrode is applied to said collector electrode to accelerate said emitted electrons.

7. An electron emitter comprising:

an electric field receiving member made of a dielectric material;

a cathode electrode formed on one surface of said electric field receiving member;

an anode electrode formed on said one surface of said electric field receiving member, with a slit defined between said cathode electrode and said anode electrode; and

a control electrode disposed over said cathode electrode and said anode electrode.

8. An electron emitter according to claim 7, further comprising:

a first modulation circuit for modulating a first voltage signal applied between said cathode electrode and said anode electrode to control at least an amount of emitted electrons; and

a second modulation circuit for modulating a second voltage signal applied between said control electrode and said anode electrode to control at least an amount of emitted electrons.

9. An electron emitter according to claim 7, wherein said control electrode is formed on a spacer which is formed on a peripheral region of said electric field receiving member.

10. An electron emitter according to claim 7, wherein said control electrode is formed on a spacer which is formed on at least said cathode electrode and said anode electrode.

11. An electron emitter according to claim 7, further comprising a second control electrode formed on a second spacer which is formed on a peripheral region of said electric field receiving member.

12. An electron emitter according to claim 7, further comprising a collector electrode for trapping said emitted electrons, wherein a positive bias voltage with respect to said anode electrode is applied to said collector electrode to accelerate said emitted electrons.

13. An electron emitter according to claim 7, wherein said electric field receiving member is made of a piezoelectric material, an anti-ferrodielectric material, or an electrostrictive material.

14. An electron emitter comprising:

an anode electrode formed on a substrate;

an electric field receiving member formed on said substrate to cover said anode electrode and made of a dielectric material;

a cathode electrode formed on said electric field receiving member;

a control electrode disposed over said cathode electrode; and

a collector electrode for trapping said emitted electrons, wherein a positive bias voltage with respect to said anode electrode is applied to said collector electrode to accelerate said emitted electrons.

15. An electron emitter according to claim 14, further comprising:

a first modulation circuit for modulating a first voltage signal applied between said cathode electrode and said anode electrode to control at least an amount of emitted electrons; and

a second modulation circuit for modulating a second voltage signal applied between said control electrode and said anode electrode to control at least an amount of emitted electrons.

16. An electron emitter according to claim 14, wherein said control electrode is formed on a spacer which is formed on a peripheral region of said electric field receiving member.

17. An electron emitter according to claim 14, wherein said control electrode is formed on a spacer which is formed on at least said cathode electrode.

18. An electron emitter according to claim 14, further comprising a second control electrode formed on a second spacer which is formed on a peripheral region of said electric field receiving member.

19. An electron emitter according to claim 14, wherein said electric field receiving member is made of a piezoelectric material, an anti-ferrodielectric material, or an electrostrictive material.

20. A method of driving an electron emitter having an electric field receiving member made of a dielectric material and a cathode electrode and an anode electrode which are formed in contact with said electric field receiving member, wherein said cathode electrode is formed on one surface of said electric field receiving member, and said anode electrode is formed on said one surface of said electric field receiving member, with a slit defined between said anode electrode and said cathode electrode, said method comprising the step of:

modulating a pulse signal applied between said cathode electrode and said anode electrode to control at least an amount of emitted electrons.

21. A display comprising:

a two-dimensional array of electron emitters;

a collector electrode facing said electron emitters; and

a plurality of fluorescent layers spaced by respective distances from said electron emitters;

each of said electron emitters comprising;

an electric field receiving member made of a dielectric material;

a cathode electrode and an anode electrode which are formed in contact with said electric field receiving member; and

a modulation circuit for modulating a voltage signal applied between said cathode electrode and said anode electrode to control a displayed gradation.

22. A display according to claim 21, wherein said modulation circuit comprises a circuit for carrying out pulse-width-modulating said voltage signal based on a gradation command value, further comprising a linearization correcting circuit connected to an input of said modulation circuit, for correcting said gradation command value in order to convert a change in the displayed gradation based on a change in said gradation command value into linear characteristics.

23. A display according to claim 21, wherein said cathode electrode is formed on one surface of said electric field receiving member, and said anode electrode is formed on said one surface of said electric field receiving member, with a slit defined between said anode electrode and said cathode electrode.

24. A display according to claim 23, wherein said control electrode is formed on a spacer which is formed on at least said cathode electrode and said anode electrode.

25. A display according to claim 21, wherein said anode electrode is formed on a substrate, said electric field receiving member is formed on said substrate to cover said anode electrode, and said cathode electrode is formed on said electric field receiving member.

26. A display according to claim 25, wherein said control electrode is formed on a spacer which is formed on at least said cathode electrode.

27. A display comprising:

a two-dimensional array of electron emitters;

a collector electrode facing said electron emitters;

a plurality of fluorescent layers spaced by respective distances from said electron emitters; and

a control electrode disposed between said fluorescent layers and said electron emitters;

each of said electron emitters comprising;

an electric field receiving member made of a dielectric material and

a cathode electrode and an anode electrode which are formed in contact with said electric field receiving member.

28. A display according to claim 27, further comprising:

a first modulation circuit for modulating a first voltage signal applied between said cathode electrode and said anode electrode to control a displayed gradation; and

a second modulation circuit for modulating a second voltage signal applied between said control electrode and said anode electrode to control a displayed gradation.

29. A display according to claim 28, wherein said first modulation circuit comprises a circuit for carrying out pulse-width-modulating said first voltage signal based on a gradation command value, further comprising a linearization correcting circuit connected to an input of said modulation circuit, for correcting said gradation command value in order to convert a change in the displayed gradation based on a change in said gradation command value into linear characteristics.

30. A display according to claim 27, wherein said cathode electrode is formed on one surface of said electric field receiving member, and said anode electrode is formed on said one surface of said electric field receiving member, with a slit defined between said anode electrode and said cathode electrode.

31. A display according to claim 30, wherein said control electrode is formed on a spacer which is formed on at least said cathode electrode and said anode electrode.

32. A display according to claim 27, wherein said anode electrode is formed on a substrate, said electric field receiving member is formed said substrate to cover said anode electrode, and said cathode electrode is formed on said electric field receiving member.

33. A display according to claim 32, wherein said control electrode is formed on a spacer which is formed on at least said cathode electrode.

34. A display according to claim 27, wherein a plurality of control electrodes capable of applying an independent voltage signal to one electron emitter are facing each other.

35. A display according to claim 27, wherein said control electrode is divided into control electrodes associated with respective rows.

36. A display according to claim 27, wherein said control electrode is divided into control electrodes associated with respective columns.

37. A display according to claim 27, wherein said control electrode is divided into control electrodes associated with the respective electron emitters.

38. A display according to claim 27, wherein said control electrode is divided into control electrodes associated with respective groups of the electron emitters.

39. A display according to claim 38, wherein said control electrode is divided into control electrodes associated with respective groups of the electron emitters each for displaying either one of three primary colors.

40. A display according to claim 27, wherein said control electrode is formed on a spacer which is formed on a peripheral region of said electric field receiving member.

41. A display according to claim 27, further comprising second control electrode disposed between said control electrode and said fluorescent layers.

42. A display according to claim 41, further comprising a third modulation circuit for modulating a third voltage signal applied between said second control electrode and said anode electrode to convert a change in the displayed gradation modulated by at least said first modulation circuit into linear characteristics.

43. A display according to claim 41, having a self-diagnostic function for trapping emitted electrons with said second control electrode and detecting a current produced by the trapped electrons for diagnosis.

44. A display according to claim 41, wherein a plurality of control electrodes capable of applying an independent voltage signal to one electron emitter are facing each other.

45. A display according to claim 41, wherein said second control electrode is divided into second control electrodes associated with respective rows.

46. A display according to claim 45, wherein said control electrode is divided into control electrodes associated with respective columns.

47. A display according to claim 45, wherein said second control electrodes are further divided into second control electrodes in each of said rows.

48. A display according to claim 41, wherein said second control electrode is divided into second control electrodes associated with respective columns.

49. A display according to claim 48, wherein said control electrode is divided into control electrodes associated with respective rows.

50. A display according to claim 48, wherein said second control electrodes are further divided into second control electrodes in each of said columns.

51. A display according to claim 41, wherein said second control electrode is divided into second control electrodes associated with the respective electron emitters.

52. A display according to claim 41, wherein said second control electrode is divided into second control electrodes associated with respective groups of the electron emitters.

53. A display according to claim 52, wherein said second control electrode is divided into second control electrodes associated with respective groups of the electron emitters each for displaying either one of three primary colors.

54. A display according to claim 41, wherein said second control electrode is formed on a second spacer which is formed on a peripheral region of said electric field receiving member.

55. A method of driving an electron emitter having an electric field receiving member made of a dielectric material and a cathode electrode and an anode electrode which are formed in contact with said electric field receiving member, said method comprising the step of:

modulating a pulse signal applied between said cathode electrode and said anode electrode to control at least an amount of emitted electrons.

56. A method according to claim 55, wherein said anode electrode is formed on a substrate, said electric field receiving member is formed on said substrate to cover said anode electrode, and said cathode electrode is formed on said electric field receiving member.

57. A method of driving an electron emitter having an anode electrode formed on a substrate, an electric field receiving member formed on said substrate to cover said anode electrode and made of a dielectric material, and a cathode electrode formed on said electric field receiving member, said method comprising the steps of:

providing a control electrode disposed over said cathode electrode;

applying a constant first pulse signal between said cathode electrode and said anode electrode; and

modulating a second pulse signal applied between said control electrode and said anode electrode to control at least an amount of emitted electrons.

58. A method of driving an electron emitter having an electric field receiving member made of a dielectric material, a cathode electrode formed on one surface of said electric field receiving member, and an anode electrode formed on said one surface of said electric field receiving member, with a slit defined between said cathode electrode and said anode electrode, said method comprising the step of:

providing a control electrode disposed over said cathode electrode and said anode electrode;

applying a constant first pulse signal between said cathode electrode and said anode electrode; and

modulating a second pulse signal applied between said control electrode and said anode electrode to control at least an amount of emitted electrons.

59. A method of driving a display having a two-dimensional array of electron emitters, and a plurality of fluorescent layers spaced by respective distances from said electron emitters, each of said electron emitters having an electric field receiving member made of a dielectric material, and a cathode electrode and an anode electrode which are formed in contact with said electric field receiving member, said method comprising the step of:

modulating a voltage signal applied between said cathode electrode and said anode electrode of each of said electron emitters to control a displayed gradation.

60. A method according to claim 59, wherein said anode electrode is formed on a substrate, said electric field receiving member is formed said substrate to cover said anode electrode, and said cathode electrode is formed on said electric field receiving member.

61. A method according to claim 59, wherein said step of modulating a voltage signal comprises the step of pulse-width-modulating said voltage signal based on a gradation command value, further comprising the step of correcting said gradation command value in order to convert a change in the displayed gradation based on a change in said gradation command value into linear characteristics.

62. A method according to claim 59, wherein said cathode electrode is formed on one surface of said electric field receiving member, and said anode electrode is formed on said one surface of said electric field receiving member, with a slit defined between said anode electrode and said cathode electrode.

63. A method of driving display having a two-dimensional array of electron emitters, a collector electrode facing said electron emitters, a plurality of fluorescent layers spaced by respective distance from said electron emitters;

and a control electrode disposed between said fluorescent layers and said electron emitters, each of said electron emitters having an electric field receiving member made of a dielectric material, and a cathode electrode and an anode electrode which are formed in contact with said electric field receiving member, said method comprising the steps of;

modulating a first voltage signal applied between said cathode electrode and said anode electrode and modulating a second voltage signal applied between said control electrode and said anode electrode to control a displayed gradation.

64. A method according to claim 63, wherein said anode electrode is formed on a substrate, said electric field receiving member is formed said substrate to cover said anode electrode, and said cathode electrode is formed on said electric field receiving member.

65. A method according to claim 63, wherein said step of modulating a first voltage signal comprises the step of pulse-width-modulating said first voltage signal based on a gradation command value, further comprising the step of correcting said gradation command value in order to convert a change in the displayed gradation based on a change in said gradation command value into linear characteristics.

66. A method according to claim 63, wherein a second control electrode is disposed between said control electrode and said fluorescent layers, and said step of modulating a first voltage signal comprises the step of pulse-width-modulating said first voltage signal based on a gradation command value, further comprising the step of modulating a third voltage signal applied between said second control electrode and said anode electrode, thereby to convert a change in the displayed gradation based on a change in said gradation command value into linear characteristics.

67. A method according to claim 63, wherein said cathode electrode is formed on one surface of said electric field receiving member, and said anode electrode is formed on said one surface of said electric field receiving member, with a slit defined between said anode electrode and said cathode electrode.