CN100555544C - Field emission pixel tube - Google Patents

Abstract

The invention relates to a field emission pixel tube. The field emission pixel tube includes: a hollow shell, the hollow shell has a light exit portion, the inner wall of the light exit portion is provided with a fluorescent layer and an anode layer in turn, the inside of the hollow shell is vacuum-sealed, There is a metal cylinder inside the hollow shell, and the inner wall of the metal cylinder is provided with a solidified slurry layer, the slurry layer contains conductive nanometer material, and the metal cylinder is electrically connected with at least one cathode electrode. The metal cylinder of the field emission pixel tube has a strong shielding effect on the electric field, which can effectively weaken the electric field on the surface of the carbon nanotube, so that the carbon nanotube can work stably at a voltage of 10 kV or higher.

Description

Field emission pixel tube

technical field

The invention relates to a field emission element, in particular to a field emission pixel tube.

Background technique

The field emission electron source and the field emission luminescence technology that uses the electron source to bombard fluorescent substances to emit light have been applied in fields such as field emission flat panel displays. This field emission technology uses an external electric field to excite the electrons at the tip in a vacuum environment, and the electrons bombard the phosphor to emit visible light for display. In traditional field emission electron sources, fine molybdenum metal tips or silicon tips are generally used as electron emission ends. With the development of nanotechnology, carbon nanotubes are also used as electron emission ends recently.

In order to effectively utilize the luminous efficiency of phosphor powder, pixel tubes generally work at a high voltage of about 10 kV, but carbon nanotubes are easily damaged under high voltage, resulting in unstable emission.

Contents of the invention

In view of this, it is necessary to provide a field emission device that can work stably under high voltage.

A field emission pixel tube, which includes: a hollow casing, the hollow casing has a light outlet, the inner wall of the light outlet is sequentially provided with a fluorescent layer and an anode layer, the inside of the hollow casing is a vacuum Sealed, the hollow shell has a metal cylinder inside, and the inner wall of the metal cylinder is provided with a solidified slurry layer, the slurry layer contains conductive nano-materials, and the metal cylinder is electrically connected with at least one cathode electrode.

Compared with the prior art, the metal cylinder of the field emission pixel tube has a strong shielding effect on the electric field, and the slurry containing carbon nanotubes is coated on the inner wall of the metal cylinder as a cathode, which can effectively weaken the electric field around the carbon nanotubes. The electric field enables the carbon nanotubes to work stably at a voltage of 10 kV or higher.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a field emission pixel tube provided by an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the field emission pixel tube provided by an embodiment of the present invention along the direction II-II in FIG. 1 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

This embodiment provides a field emission pixel tube 10 . Please refer to FIG. 1 and FIG. 2, the field emission pixel tube 10 includes: a hollow housing 11, the hollow housing 11 has a light exit portion 12, the inner wall of the light exit portion 12 is provided with a fluorescent layer 13 and an anode in turn layer 14, the inside of the hollow shell 11 is vacuum-tight, and there is a metal cylinder 16 inside the hollow shell 11, and the inner wall of the metal cylinder 16 is provided with a solidified slurry layer 17, and the slurry layer 17 Containing conductive nanomaterials, the metal cylinder 16 is electrically connected to at least one cathodic electrode. In this embodiment, the metal cylinder 16 is electrically connected to two cathode electrodes respectively, and the two cathode electrodes are respectively a first cathode electrode 18 and a second cathode electrode 19 .

The inside of the hollow shell 11 is vacuum-tight. In this embodiment, the shell 11 is a hollow cylinder, and the material of the shell 11 is quartz glass or glass. It can be understood that the housing 11 can also be a hollow polygonal prism, and the light exit portion 12 of the housing 11 can be a plane or a spherical or aspherical surface, which can be selected by those skilled in the art according to the actual situation.

The fluorescent layer 13 is deposited on the inner wall of the light emitting portion 12 . The fluorescent layer 13 can be composed of white fluorescent powder or colored fluorescent powder. White or colored visible light can be emitted when electrons bombard the fluorescent layer 13 . The anode layer 14 is plated on the inner wall of the light exit portion 12 deposited with the fluorescent layer 13 and covers the fluorescent layer 13 to conduct electricity and reflect the fluorescent powder to emit light. The anode layer 14 is a metal film with good electrical conductivity and mirror flatness. In this embodiment, the anode layer 14 is an aluminum film.

In this embodiment, the metal cylinder 16 is a cylinder, and the central axis of the metal cylinder 16 is perpendicular to the light emitting portion 12 . It can be understood that the metal cylinder 16 can also be a square cylinder, a polygonal cylinder and other cylindrical structures.

The inner wall of the metal cylinder 16 has a solidified slurry layer 17, the slurry layer 17 contains conductive nanomaterials, and the nanomaterials can be selected from carbon nanotubes, carbon nanorods, carbon 60, carbon nanoparticles, conductive Any one of metal or semiconductor nanotubes, nanowires, nanorods, nanobelts and mixtures thereof, carbon nanotubes are selected in this embodiment. The prepared slurry layer 17 is coated on the inner wall of the metal cylinder 16 and cured, and finally the inner wall of the metal cylinder 16 is rubbed with a rubber to expose more carbon nanotubes in the slurry layer 17 and enhance its field emission performance. The shielding effect of the metal cylinder 16 on the carbon nanotube emitter depends on the distance between the edge of the slurry layer 17 and the edge of the metal cylinder 16, the larger the distance, the stronger the shielding effect; it also depends on the diameter of the metal cylinder 16, the smaller the diameter, the greater the shielding effect. The stronger the effect.

The metal cylinder 16 is electrically connected to the first cathode electrode 18 and the second cathode electrode 19 respectively. The first cathode electrode 18 and the second cathode electrode 19 pass through the housing 11 and extend to the outside of the housing 11 . The part where the first cathode electrode 18 and the second cathode electrode 19 pass through can be sealed with glass sealing technology to ensure the airtightness inside the housing 11 .

The field emission pixel tube 10 further includes an anode electrode 15 . The anode electrode 15 is electrically connected to the anode layer 14 . The anode electrode 15 extends through the casing 11 to the outside of the casing 11 . The part through which the anode electrode 15 passes can be sealed with glass sealing technology to ensure the sealing of the inside of the casing 11 .

The field emission pixel tube 10 further includes a getter 20 for absorbing residual gas in the field emission pixel tube 10 to maintain the vacuum inside the field emission pixel tube 10 . The getter 20 may be an evaporable getter, which is formed on the inner wall of the housing 11 close to the first cathode electrode 18 and the second cathode electrode 19 by high-frequency heating evaporation after the housing 11 is sealed. The getter 20 can also be a non-evaporable getter, fixed on the inner wall of the shell 11 close to the first cathode electrode 18 and the second cathode electrode 19 , or fixed on the inner or outer wall of the metal cylinder 16 .

The field emission pixel tube 10 further includes an exhaust hole 21 , and the exhaust hole 21 is externally connected with a vacuum pump for evacuating the casing 11 . During encapsulation, the final encapsulation is performed after the field emission pixel tube 10 reaches a certain degree of vacuum through the exhaust hole 21 .

When the field emission pixel tube 10 was in operation, a voltage was applied between the anode electrode 15, the first cathode electrode 18, and the second cathode electrode 19 to form an electric field. The carbon nanotubes emit electrons, and the electrons penetrate the anode layer 14 and bombard the fluorescent layer 13 to emit visible light. A part of the visible light is directly emitted from the light exit portion 12 , and a part is emitted on the anode layer 14 . The anode layer 14 reflects it and finally passes through the light emitting portion 12 to emit. A plurality of such field emission pixel tubes 10 can be arranged for illumination or information display.

Compared with the prior art, the metal cylinder 16 of the field emission pixel tube 10 has a strong shielding effect on the electric field, and coating the slurry containing carbon nanotubes on the inner wall of the metal cylinder 16 as a cathode can effectively weaken the carbon The electric field around the nanotubes enables the carbon nanotubes to work stably at voltages of 10 kilovolts or higher.

In addition, those skilled in the art can also make other changes within the spirit of the present invention. Of course, these changes made according to the spirit of the present invention should be included in the scope of protection claimed by the present invention.

Claims (9)

1. field emission pixel tube, it comprises:

A hollow housing, this hollow housing has a light out part, the inwall of this light out part is provided with a fluorescence coating and an anode layer successively, described hollow housing inside is vacuum-packed, it is characterized in that: a metal cylinder is arranged in this hollow housing, this metal cylinder inwall is provided with the pulp layer of one deck through solidifying, and this pulp layer contains the nano material of conduction, and this metal cylinder is electrically connected with at least one cathode electrode.

2. field emission pixel tube as claimed in claim 1 is characterized in that, this hollow housing is a hollow circular cylinder.

3. field emission pixel tube as claimed in claim 1 is characterized in that, this hollow housing is a glass.

4. field emission pixel tube as claimed in claim 1 is characterized in that, this anode layer is the aluminium film.

5. field emission pixel tube as claimed in claim 1 is characterized in that, further comprises an anode electrode, and this anode electrode is electrically connected with described anode layer, and passes described housing and extend to this outside.

6. field emission pixel tube as claimed in claim 1 is characterized in that, this at least one cathode electrode passes described housing and extends to this outside.

7. field emission pixel tube as claimed in claim 1 is characterized in that this fluorescence coating is made up of white fluorescent powder or color phosphor.

8. field emission pixel tube as claimed in claim 1 is characterized in that, further comprises getter, and this getter is formed near on the inner walls of this at least one cathode electrode.

9. field emission pixel tube as claimed in claim 1 is characterized in that, this nano material is selected from any one in carbon nano-tube, carbon 60, carbon nano-particle, nano wire, nanometer rods, nano belt and composition thereof.

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