JPH10116578A - Fluorescence display tube and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a uniform luminance characteristics by maintaining the distance of an anode and a filament constant and improve workability and productivity by simplifying the manufacturing process of the anode, by directly forming the fluorescent layer of the anode on a conductive layer formed by a single layer. SOLUTION: A conductive layer 7a of a single layer which directly connects an external power source and is excellent in conductivity is formed on one side of substrate glass 1. On the conductive layer 7a, a fluorescent layer 7b having a prescribed pattern is directly formed. Therefore, thickness of an anode 7 made of the conductive layer 7a of the single layer and the fluorescent layer 7b is easily uniformized and the distance with a filament 9 is uniformized in all the patterns. Thus, quality can be improved without partially lowering luminance in the whole of the anode. Because the anode can be formed in a simple process because the anode does not take a multilayer structure, the manufacturing process is shortened and workability and productivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube and a method of manufacturing the same, and more particularly, to a structure of an anode for receiving electrons emitted from a cathode so as to obtain uniform brightness by sufficient electron absorption. And a method of manufacturing the same.

[0002]

2. Description of the Related Art As is well known, a VFD (Vacuum Fluorescent Display), which is one of flat panel displays, emits electrons emitted from a cathode to an anode formed in a predetermined pattern on a substrate glass. This is a magnetic light emitting element that emits light to display desired numbers, characters, pictures, and the like. Such a structure of a fluorescent display tube is generally configured by disposing a cathode, a grid, and an anode as basic electrodes in a vacuum vessel. Here, the cathode is generally composed of a filament. The anode is formed by printing a phosphor on a conductive layer formed while maintaining a predetermined pattern on the substrate glass. At this time, the conductive layer is connected to a wiring layer connected to a power source applied from outside the container.

On the other hand, in recent years, when manufacturing a fluorescent display tube, when forming an anode, a dot layer is formed together with an insulating layer. Here, the insulating layer is a layer printed on the upper surface of the wiring layer, which prevents unnecessary electric conduction occurring between the wirings, and the dot layer is printed on a through hole formed in the insulating layer to form a wiring. It serves to electrically connect the layer and the conductive layer. In order to form an anode of a fluorescent display tube including such an insulating layer and a dot layer, in a substrate glass process, a wiring layer is printed on washed glass, and an insulating layer having a through hole on an upper surface of the wiring layer is formed. After printing a layer, a dot layer is printed in the through hole, and a conductive layer formed in a desired pattern is printed on the upper surface of the dot layer so as to be connected to the dot layer. Through a step of printing a predetermined phosphor. In this step, after forming the dot layer, a secondary insulating layer can be printed on the upper surface of the primary printed insulating layer to enhance the insulating function.

As described above, in the conventional fluorescent display tube, when the anode is formed on the substrate glass, not only the conductive layer and the fluorescent layer but also the insulating layer and the dot layer are formed, and the performance of the anode is determined by the function of each layer. ,In other words,
The performance of the fluorescent display tube is improved.

[0005]

However, as described above, if the fluorescent display tube is formed on the substrate glass in such a manner that each layer from the wiring layer to the fluorescent layer is subdivided, the fluorescent display tube is actually used. Occasionally, the brightness of each anode pattern may be non-uniform, and the quality may be reduced. The cause of this phenomenon can be found from the point that the anode is formed on the upper surface of many layers, that is, the wiring layer, the insulating layer, and the dot layer. That is, if the plurality of layers are printed with a partially non-uniform thickness on the substrate glass in some cases, the anode formed at the corresponding portion may be printed on the layer having the uniform thickness. The distance from the filament is not uniform as compared to the formed anode. Therefore, for the above-described reason, an anode having a poor distance from the filament cannot sufficiently absorb the electrons emitted from the filament, and eventually decreases its brightness. It should be noted that when a fluorescent display tube is manufactured by the above-described anode forming method, there are problems in that the manufacturing process is complicated due to many process steps, the workability is reduced, and the productivity is low.

The present invention has been devised in view of the above-mentioned problems of the prior art, and has as its object to maintain a constant distance between the anode and the filament to partially cover each anode pattern. A fluorescent display tube having uniform luminance characteristics capable of preventing quality deterioration of the fluorescent display tube due to the resulting luminance reduction and improving the workability and productivity by reducing the number of anode forming steps. Another object of the present invention is to provide a method for forming an anode of a fluorescent display tube.

[0007]

The above object is achieved by the invention described in the claims. That is, the characteristic structure of the fluorescent display tube of the present invention is that a plurality of first substrates and a plurality of substrates are formed on one surface of the first substrate by a predetermined pattern and are electrically connected to an external power supply unit. A conductive layer, a fluorescent layer formed in a predetermined pattern on one surface of the conductive layer, a cathode that is disposed at a predetermined distance from the fluorescent layer and emits electrons, and the cathode and the fluorescent layer A grid disposed between the first and second substrates, a second substrate disposed at a predetermined distance from the first substrate, and a grid disposed between the first substrate and the second substrate. A connection member that forms a main body of the fluorescent display tube together with the first and second substrates by being connected to each other. The first substrate, the second substrate, and the connecting member are preferably made of glass. This is because it is excellent in insulation and transparency, but is inexpensive.

A feature of the method for manufacturing a fluorescent display tube according to the present invention is that a conductive layer which is divided into a plurality of parts by a predetermined pattern and is connected to an external power supply unit is formed on one surface of a substrate having a predetermined size. And a step of forming a phosphor layer having a predetermined pattern on one surface of the conductive layer.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing the fluorescent display tube according to the present embodiment, and FIG.
FIG. 3 is a plan view showing a glass substrate in the fluorescent display tube according to the present embodiment. As shown in FIGS. 1 and 2, this fluorescent display tube has a structure in which a second substrate and a connecting member are arranged on an upper surface of a first substrate, and these are connected to each other by an attaching means such as a frit. The inside is depressurized to form a vacuum container. In this vacuum container, a cathode, a grid, and an anode are formed as basic electrodes.
That is, when electrons are emitted from the cathode, the fluorescent display tube accelerates and diffuses the electrons through the grid, and collides the electrons with the phosphor of the anode to emit light. The image is realized.

In such a fluorescent display tube, the container forming the outer body is generally formed of a transparent material. In this fluorescent display tube, the first member forming the container is also used.
The second substrate and the connecting member are made of a glass material. That is, the fluorescent display tube has a substrate glass 1 corresponding to a first substrate and a windshield 3 corresponding to a second substrate arranged at a predetermined interval, and a side glass 5 corresponding to a connecting member therebetween. Are connected to each other by a frit as an adhesive to form one main body, which is formed in a vacuum container body. In this container, an anode 7 is formed on one surface of the substrate glass 1 in a predetermined pattern, and a filament 9 corresponding to a cathode and a grid 11 are arranged above the anode 7. Here, a large number of filaments 9 are provided, both ends of which are supported by a filament support 13. The grid 11 accelerates and diffuses the electrons emitted from the filament 9 and transmits the electrons to the anode 7. .

The anode 7 is formed on one surface of the substrate glass 1 while maintaining a predetermined pattern, and further includes a conductive layer 7a directly connected to a power supply unit 15 for applying power from outside the container. A fluorescent layer 7b is formed directly on one surface of the conductive layer 7a in a predetermined pattern.
In order to form such an anode 7, first, the conductive layer 7a is formed on one surface of the substrate glass 1 in a predetermined pattern. At this time, since the conductive layer 7a also serves as a wiring layer provided in a conventional fluorescent display tube, it is preferable to consider this when forming the pattern. In the present embodiment, the conductive layer 7a
The fluorescent layer 7b is formed on Ag or Al having excellent electrical conductivity.
In order to improve the adhesiveness with the binder, the binder is mixed with other pigments.

After the conductive layer 7a is formed on the substrate glass 1, a fluorescent layer 7b is formed on one surface of the conductive layer 7a.
Are formed directly while maintaining a predetermined pattern. That is,
In the present embodiment, by forming the fluorescent layer 7b directly on the conductive layer 7a formed of a single layer, the probability that the formed thickness becomes partially non-uniform is reduced,
The distance from the filament 9 is made uniform in all patterns. The fluorescent layer 7b shown in FIG.
Each pattern is formed directly on the conductive layer 7a while maintaining a so-called seven-segment pattern.

On the other hand, as shown in FIG. 3, the fluorescent layer 7b is preferably formed in a size that can be located within the area of the conductive layer 7a. As described above, the anode 7 formed on the substrate glass 1 is applied with a predetermined voltage through the lead 17 which is connected to the conductive layer 7 a and is electrically connected to the power supply unit 15. Is done.

The fluorescent display tube configured as described above is
A predetermined power supply is applied to each electrode according to a driving method to express a desired character or image. At this time, the anode 7
As described above, the fluorescent display tube is formed so that the distance from the filament 9 is uniform due to its structure. Therefore, in this fluorescent display tube, the anode 7 sufficiently receives electrons emitted from the filament 9 and 7 can be displayed without lowering the luminance that occurs partially in the whole.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to this, and may be modified in various forms within the scope of the claims, the detailed description of the invention, and the accompanying drawings. It goes without saying that this also belongs to the scope of the present invention.

[0016]

As described above, in the fluorescent display tube of the present invention, since the fluorescent layer of the anode is formed on a single layer rather than on multiple layers, electrons emitted from the cathode during the operation thereof are discharged to all of the anode. By being received uniformly in the pattern and displayed without causing a partial decrease in luminance, the effect of improving the user's use satisfaction is exhibited. When a fluorescent display tube is manufactured by the method of the present invention,
Since the anode can be formed in a simple process, the production process can be shortened, and the effect of improving workability and productivity can be achieved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a fluorescent display tube according to an embodiment of the present invention.

FIG. 2 is a plan view showing a fluorescent display tube according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st board 3 2nd board 5 Connecting member 7 Anode 7a Conductive layer 7b Fluorescent layer 9 Cathode 11 Grid 13 Filament support 15 External power supply section 17 Lead

Claims (3)

[Claims] A first substrate, a plurality of conductive layers formed on one surface of the first substrate in a predetermined pattern and electrically connected to an external power supply unit; A fluorescent layer formed in a predetermined pattern on one surface, a cathode disposed at a predetermined distance from the fluorescent layer and emitting electrons, and a cathode disposed between the cathode and the fluorescent layer. A grid for accelerating and diffusing, a second substrate disposed at a predetermined distance from the first substrate, and disposed between and interconnected to the first and second substrates. A connection member forming a main body of the fluorescent display tube together with the first and second substrates. 2. The fluorescent display tube according to claim 1, wherein the first substrate, the second substrate, and the connecting member are made of glass. Forming a conductive layer on a surface of the substrate having a predetermined size, the conductive layer being divided into a plurality of patterns by a predetermined pattern and being connected to an external power supply unit; Forming a fluorescent layer having: and a method for manufacturing a fluorescent display tube by manufacturing an anode.