Display using a movable electron field emitter and method of manufacture thereof

• US 7,786,662 B2
• Filed: 05/19/2005
• Issued: 08/31/2010
• Est. Priority Date: 05/19/2005
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: DiCarlo, Anthony
• Primary Examiner(s): Williams; Joseph L
• Assistant Examiner(s): Farokhrooz; Fatima N
• Application Number:
  US11/134,163
• Publication Number:
  US 20060261724A1
• Time in Patent Office: 1,930 Days
• Field of Search: 313309-311, 313/336, 313/351, 313/422, 313495-497, 315/169.1, 315/169.3, 438/20, 257/10
• US Class Current: 313/495
• CPC Class Codes: H01J 29/00 Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
• CPC Class Codes: H01J 31/123 Flat display tubes

Abstract

A field emission device 100 comprises an anode 105 and a cathode 110 separated by a distance 115 from the anode. At least one of the anode or cathode is configured to move with respect to the other in response to an applied voltage 120 to at least one of the anode and cathode, the distance being adjustable by the movement.

Claims

1. A field emission device, comprising:

an anode;

a cathode spaced from the anode;

the cathode including a hinge portion, and a spring portion having a knife-edge tip rotatable about the hinge portion between a position of minimal spacing and a position of maximal spacing of the tip relative to the anode;

a first voltage source coupled between the anode and cathode for causing electrons to be emitted from the tip when the tip is in the minimal spacing position and to be not emitted from the tip when the tip is in the maximal spacing position; and

a structure including a control circuit and electrode pads;

the electrode pads being electrostatically coupled to the cathode for selectively driving the tip between the minimal and maximal spacing positions in response to a voltage applied by the control circuit.

2. The device of claim 1, wherein the anode includes an opening in alignment with the tip.

3. The device of claim 1, wherein the electrode pads include an electrode pad having an opening in alignment with the tip.

4. The device of claim 1, wherein the control circuit is a CMOS circuit.

5. The device of claim 1, wherein the spring portion is an elongated element centrally joined for rotation about the hinge portion;

the knife-edge tip is a first knife-edge tip located at an end of the elongated element; and

the spring portion has a second knife-edge tip located at an opposite end of the elongated element.

6. The device of claim 2, wherein the anode opening is a first opening;

the electrode pads include an electrode pad having a second opening in alignment with the tip; and

the tip is located between the first and second openings.

7. The device of claim 6, wherein the control circuit is a CMOS circuit.

8. The device of claim 7, wherein the spring portion is an elongated element centrally joined for rotation about the hinge portion;

the knife-edge tip is a first knife-edge tip located at an end of the elongated element;

the first opening is in alignment with the first knife-edge tip;

the spring portion has a second knife-edge tip located at an opposite end of the elongated element;

the anode includes a third opening in alignment with the second knife-edge tip; and

the electrode pad includes a fourth opening in alignment with the second knife-edge tip;

the second knife-edge tip being located between the third and fourth openings.

9. The device of claim 8, wherein the knife-edge of the first knife-edge tip is longer than the knife-edge of the second knife-edge tip.

10. The device of claim 5, wherein the knife-edge of the first knife-edge tip is longer than the knife-edge of the second knife-edge tip.

11. A display system, comprising:

a field emission device, including;

an anode including an opening;

a cathode spaced from the anode;

the cathode including a hinge portion, and a spring portion having a knife-edge tip rotatable about the hinge portion between a position of minimal spacing and a position of maximal spacing of the tip relative to the anode;

a first voltage source coupled between the anode and cathode for causing electrons to be emitted from the tip and to pass through the opening when the tip is in the minimal spacing position and to be not emitted from the tip when the tip is in the maximal spacing position; and

a structure including a control circuit and electrode pads;

the electrode pads being electrostatically coupled to the cathode for selectively driving the tip between the minimal and maximal spacing positions in response to a voltage applied by the control circuit; and

a phosphor surface positioned to generate light when electrons are emitted from the tip and pass through the opening.

12. The system of claim 11, wherein the anode opening is a first opening;

the electrode pads include an electrode pad having a second opening in alignment with the tip; and

the tip is located between the first and second openings.

13. The system of claim 11, wherein the electrode pads include an electrode pad having an opening in alignment with the tip.

14. The system of claim 11, wherein the control circuit is a CMOS circuit.

15. The system of claim 11, wherein the spring portion is an elongated element centrally joined for rotation about the hinge portion;

the knife-edge tip is a first knife-edge tip located at an end of the elongated element;

the first opening is in alignment with the first knife-edge tip;

the spring portion has a second knife-edge tip located at an opposite end of the elongated element;

the anode includes a third opening in alignment with the second knife-edge tip; and

the electrode pad includes a fourth opening in alignment with the second knife-edge tip;

the second knife-edge tip being located between the third and fourth openings.

16. The system of claim 12, wherein the control circuit is a CMOS circuit.

17. The system of claim 16, wherein the spring portion is an elongated element centrally joined for rotation about the hinge portion;

the knife-edge tip is a first knife-edge tip located at an end of the elongated element;

the first opening is in alignment with the first knife-edge tip;

the spring portion has a second knife-edge tip located at an opposite end of the elongated element;

the anode includes a third opening in alignment with the second knife-edge tip; and

the electrode pad includes a fourth opening in alignment with the second knife-edge tip;

the second knife-edge tip being located between the third and fourth openings.

18. The system of claim 17, wherein the knife-edge of the first knife-edge tip is longer than the knife-edge of the second knife-edge tip.

19. The system of claim 15, wherein the knife-edge of the first knife-edge tip is longer than the knife-edge of the second knife-edge tip.