KR20040064800A - Fluorescent tube with carbon nano tube - Google Patents

Abstract

PURPOSE: A VFD(vacuum fluorescent display) with a carbon nano tube is provided to drive a VFD with a small current by installing a fluorescent layer in front of the metal film and a carbon nano tube on a filament. CONSTITUTION: A VFD comprises a filament(3) serve as a cathode, a metal film serve as an anode, a fluorescent layer, and a grid in a vacuum glass tube(1). The grid is removed inside of the glass tube and a carbon nano tube(7) are installed on the surface of the filament. A transparent electrode and a phosphor are formed on inner surface of the glass tube corresponding to the filament.

Description

Fluorescent tube with carbon nano tube

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube using carbon nanotubes, and in particular, introduces carbon nanotubes as an electron generating source and places a fluorescent layer in front of an electrode to increase the amount of collision of electrons to a fluorescent object, thereby ultimately increasing luminous efficiency. It relates to a fluorescent display tube using carbon nanotubes that can further increase the

Carbon nanotubes were introduced in 1991, when Croto and Smalley first discovered Fullerence (a group of 60 carbon atoms, C60), one of the allotrope of carbon. Dr. Iijima of a research institute affiliated with a Japanese electric company, who was researching a new material, first discovered a long and long carbon nanotube in the process of analyzing carbon lumps formed on graphite cathode by using electric discharge method. Became known. The carbon nanotubes grown at this time are tens of nanometers to several nanometers in length, and the outer diameter is extremely small, such as 2.5 to 30 nanometers, and in the carbon nanotubes, one carbon atom is a hexagonal honeycomb of three spontaneous carbon atoms. This tube is called "nanotubes" because it is extremely small, about a few nanometers in diameter. In 1998, Ren et al. Synthesized carbon nanotubes of vertically oriented high-density carbon nanotubes on a glass substrate using plasma chemical vapor deposition, which is a major step forward in the synthesis and application of carbon nanotubes. Since then, research on the synthesis and application of carbon nanotubes has been made.

Recently, a fluorescent display tube that can be used even by supplying such a carbon nanotube to a filament and supplying a low current is used. The cathode is installed on the ceramic plate 2 of the inner bottom of the vacuum glass tube 1 as shown in FIG. Anodic metal film 6 having a filament 3 to perform a function, a grid 4 having a structure covering the filament 3, and a fluorescent layer 5 to serve as a plate with a space on the grid 4. A plurality of carbon nanotubes 7 are added to the existing fluorescent display panel structure including (a). That is, the conductive polymer layer 8 is coated on the surface of the filament 3 and the carbon nanotubes 7 are settled on the polymer layer 8, and then the polymer layer 8 is thermally cured to thereby surface the filament 3. Carbon nanotube (7) is installed to be fixed to the hard. In FIG. 1, reference numeral 9 is a top glass, A is an anode terminal, K is a cathode terminal, and G is a grid terminal.

However, such a structure causes electrons to hit the metal film 6 to reduce light energy, and the grid obstructs the path of the force generating the electrons.

The present invention aims to solve this problem. An object of the present invention is to use a carbon nanotube to perform a fluorescent display function with a small current by installing a fluorescent layer in front of a metal film and installing carbon nanotubes on a filament without using a grid. To provide a fluorescent display tube using the tube.

To this end, the present invention is to install a filament in the glass tube, but a plurality of carbon nanotubes are installed on the outer periphery of the filament, and the transparent conductive layer and the phosphor are installed in the inner circumferential surface of the glass tube in order toward the center to implement a fluorescent function with a small current Provided is a fluorescent display tube using carbon nanotubes.

1 is a cross-sectional view of a typical carbon nanotube fluorescent display tube,

2 is a view showing an example of the present invention;

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a view showing another example of the present invention;

5 is a view showing another example of the present invention;

6 is a cross-sectional view of main parts of FIG. 5;

7 is a view showing another example of the present invention;

8A is a view illustrating an example of the filament of FIG. 7;

8B is a view showing another example of the filament of FIG. 7,

8C is a view showing another example of FIG. 7,

9A is a view showing a planar arrangement example of the carbon nanotubes shown in FIG. 5;

9B is a view showing another planar arrangement example of the carbon nanotubes shown in FIG. 5;

9C is a view showing another planar layout example of the carbon nanotubes shown in FIG. 5;

9D is a view showing another planar layout example of the carbon nanotubes shown in FIG. 5;

10 is a view showing another example of the display tube of the present invention;

11 is a view showing another example of the present invention.

<Explanation of symbols for the main parts of the drawings>

1; glass tube 2; ceramic tube

3; filament 4; grid

5; fluorescent layer 6; metal film

7; carbon nanotube 8; polymer layer

9; top glass 10; glass plate

11; spacer 12; substrate

K; cathode terminal A; anode terminal

That is, the present invention provides a vacuum tube type fluorescent display tube having a filament with a cathode function, a metal film with an anode function, a fluorescent layer, and a grid in a vacuum glass tube.

Remove the grid in the glass tube, install carbon nanotubes on the filament surface to conduct the dispersion

An object of the present invention is to provide a fluorescent display tube using carbon nanotubes having a structure in which transparent electrodes and phosphors are sequentially formed on an inner surface of a glass tube corresponding to a filament.

The glass tube may have a cylindrical shape, and the filament may be installed in the longitudinal direction at the center of the diameter, and anode and cathode terminals may be formed at both ends of the glass tube, respectively.

The glass tube forms an annulus through which the inside is penetrated, and the filament is installed in the longitudinal direction along the center of the diameter of the tube, and the anode and the cathode terminals may be exposed to one side in the radial direction.

The glass tube is configured to cover the plate-shaped glass plate with a spacer of a certain height on the lower plate;

The filament is composed of a conductive polymer layer formed on an insulating base forming a lower plate, and a plurality of dispersed carbon nanotubes vertically fixed to be connected thereto, and the glass tube has a carbon nanotube and a spacer spaced apart at a predetermined distance. It can illustrate that.

The carbon nanotubes may be exemplified by being disposed in one of circular, square spiral, zigzag, or spiral shapes.

The glass tube may form an incandescent bulb shape, and may be exemplified by installing a filament in which carbon nanotubes are conductively formed at an upper end of the filament connecting rod.

The incandescent lamp filament may be exemplified by a conductive polymer layer placed on a hemispherical ceramic surface or a hemispherical tungsten to enable conduction of carbon nanotubes.

Another example of the incandescent lamp filament is a cylindrical tungsten tube and can be exemplified as having a conductive polymer layer on the surface thereof to allow conduction.

The filaments of the present invention can be exemplified by forming a spiral or triangular spiral.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view showing an example of the present invention. FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and a transparent electrode such as indium tin oxide is formed on the inner wall of the cylindrical glass tube 1 with a metal film 6, Subsequently, the fluorescent layer 5 is formed on the inner surface of the metal film 6. And the filament 3 of a cathode function is settled in the longitudinal direction from the center of the glass tube 1, and it is installed so that it may be connected with the cathode terminal K exposed to the both ends of the glass tube 1 in the longitudinal direction. Of course, the metal film 6 of the transparent electrode is also provided so as to be conductive with the anode terminal A exposed at both ends in the longitudinal direction of the glass tube 1. In this case, each terminal (A, K) is made of a configuration that is exposed to both ends, such as a fluorescent lamp has an advantage that can be used in combination with the existing fluorescent lamp fixing structure.

The metal film 6 used in the present invention uses a transparent electrode. Examples of preferred materials include indium tin oxide. In addition, the fluorescent layer 5 used in the present invention may be a fluorescent material (3Ca ₃ (PO ₄ ) ₂ CaFCl / Sb, Mn) that causes short wavelength white light emission or a fluorescent material that generates _three wavelength white wavelengths. Therefore, since the metal film 6 is transparent, even if the metal film 6 is formed directly on the inner surface of the glass tube 1, the metal film 6 functions so as not to interfere with the emission of light emitted through the fluorescent layer 5 on the inner surface.

The filament 3 used in the present invention may exemplify a configuration in which carbon nanotubes are bonded to a rod-shaped tungsten outer circumferential surface, or a structure in which carbon nanotubes are bonded to tubular ceramics. Of course, for this purpose, after coating a conductive polymer to fix the carbon nanotubes on the tungsten or ceramic surface, the carbon nanotubes are impregnated and cured (preferably hardening at a low temperature of 300 degrees Celsius or less). It can be illustrated.

Another embodiment of the present invention can be exemplified as having an annular shape as shown in FIG. In this case as well, the filament 3 is also provided in the center of the glass tube 1 through which the inside is annularly penetrated, and the carbon nanotubes 7 are coupled to the outer surface of the filament 3 so as to enable conduction. In this case, as the terminal, the anode terminal A has a structure in which the metal film 6 of the transparent electrode and the cathode terminal K are connected to the filament 3 and exposed to one side in the radial direction as shown in FIG. 3.

FIG. 5 is a view showing another embodiment of the present invention, and FIG. 6 is a cross-sectional view of the main part of FIG. 5. The polymer layer 8 is coated on the plate-shaped substrate 12 and the carbon nanotubes 7 are exposed at the upper end. Impregnated to harden to form a lower plate, a transparent metal film 6 made of indium tin oxide or the like is applied to the bottom of the glass plate 10, and an upper plate having the fluorescent layer 5 is formed. Then, the spacer 11 of a predetermined height is placed on the lower plate and the upper plate is integrally coupled. In this case, the spacer 11 also serves as a side sealing function that makes the inside of the upper and lower plates vacuum. In this case, in order to form a fluorescent display tube, the cathode terminal K is combined so that the polymer layer 8 forms a cathode, and the anode terminal A, which forms an anode, is omitted in the drawing. will be.

FIG. 7 is another embodiment of the present invention, and FIGS. 8A to 8C are other examples of the filaments 3 used in FIG. 7. The semi-circular filaments (FIG. 8A (ceramic substrate) in the glass tube 1 of the general incandescent bulb type are shown in FIG. 12, a configuration in which the carbon nanotubes 7 are coupled to FIG. 8B (tungsten substrate 12) or tubular filaments (FIG. 8C) can be illustrated.

9 is a view showing a practical example of the shape of the carbon nanotubes bonded to the polymer layer (8), circular spiral (Fig. 9a), square spiral (Fig. 9b), zigzag (Fig. 9c) and spiral (Fig. 9d) Exemplify what was achieved.

FIG. 10 shows another embodiment of the present invention, in which the filament 3 shown in FIG. 2 is spiraled in the glass tube 1. Of course, also in this case, the carbon nanotubes are bonded to the outer periphery of the filament (3). In this case, the anode terminal A and the cathode terminal k form a configuration exposed to one end of the glass tube 1.

FIG. 11 illustrates another embodiment of the present invention, in which a triangular helical filament 3 having a shape that surrounds the protruding inner circumferential surface of the glass tube 3 protruding upward from the center bottom is illustrated. In this case, the anode terminal A and the cathode terminal K form a configuration exposed at the upper end of the glass tube 1, respectively.

The present invention described above is not limited to the above-described embodiments and drawings, and various permutations, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those who have

As described above, the present invention has a simple configuration by omitting the grid between the anode and the cathode, and since the metal film supporting the fluorescent layer is integrated with the inner wall of the glass tube and then forms a fluorescent layer, electrons directly contact the fluorescent layer, thereby providing fluorescence. In addition, since transparent indium tin oxide is used as the metal film, even if the fluorescent layer is formed inside the glass tube, the fluorescence can be used without disturbing the fluorescence through the transparent metal film and the glass tube.

In addition, the filament can be used in the center of the glass tube because it does not use a grid, so it can be realized in rod, annular, surface light type, and bulb type, and the filament can be designed in a spiral shape. To achieve diversity.

In addition, in the case of the plate-shaped filament method, carbon nanotubes can be variously configured in a spiral shape, a square spiral shape, a zigzag shape, a spiral shape, and the like to provide a variety of designs of fluorescent display tubes.

Claims (14)

In a vacuum tube type fluorescent display tube having a cathode filament and an anode metal film, a fluorescent layer, and a grid in a vacuum glass tube, Remove the grid in the glass tube, install carbon nanotubes on the filament surface to conduct the dispersion A fluorescent display tube using carbon nanotubes, characterized in that the transparent electrode and the phosphor are sequentially formed on the inner surface of the glass tube corresponding to the filament. 2. The fluorescent display tube according to claim 1, wherein the glass tube has a cylindrical shape and the filaments are installed in the longitudinal direction at the center of the diameter, and anode and cathode terminals are formed at both ends of the glass tube, respectively. The carbon nanotube of claim 1, wherein the glass tube has an annular shape through which the inside is penetrated, and the filament is installed in the longitudinal direction along the center of the diameter of the tube, and the anode and the cathode terminal are formed to expose the anode and the cathode terminals on one side in the radial direction. Fluorescent display tube using tube. The glass tube according to claim 1, wherein the glass tube is configured to cover a plate-shaped glass plate with a spacer having a predetermined height on a lower plate; The filament is composed of a conductive polymer layer formed on an insulating base forming a lower plate, and a plurality of dispersed carbon nanotubes vertically fixed to be connected thereto, and the glass tube has a carbon nanotube and a spacer spaced apart at a predetermined distance. Fluorescent display tube using carbon nanotubes, characterized in that. 5. The fluorescent display tube according to claim 4, wherein the carbon nanotubes are arranged in a circular spiral shape. 5. The fluorescent display tube according to claim 4, wherein the carbon nanotubes are arranged in a square spiral shape. 5. The fluorescent display tube according to claim 4, wherein the carbon nanotubes are arranged in a zigzag shape. 5. The fluorescent display tube according to claim 4, wherein the carbon nanotubes are arranged in a spiral shape. The fluorescent display tube according to claim 1, wherein the glass tube has a shape of an incandescent bulb, and a filament in which carbon nanotubes are conducted at an upper end of the filament connecting rod is installed at the center thereof. 10. The fluorescent display tube according to claim 9, wherein the filament has a conductive polymer layer formed on a hemispherical ceramic surface so as to enable conduction of carbon nanotubes. 10. The fluorescent display tube according to claim 9, wherein the filament has a conductive polymer layer formed on hemispherical tungsten to allow the carbon nanotubes to conduct. 10. The fluorescent display tube according to claim 9, wherein the filament is a cylindrical tungsten tube and a conductive polymer layer is formed on the surface to enable conduction. The fluorescent display tube using carbon nanotubes according to claim 1, wherein the filaments are helical. 2. The fluorescent display tube according to claim 1, wherein the glass tube protrudes upward on the bottom of the center, the filaments form a triangular spiral, and the cathode and anode terminals are exposed to the top.