KR200218150Y1 - Anode Substrate for Fluorescent Display - Google Patents

Abstract

The present invention relates to a positive electrode substrate for a fluorescent display tube, wherein a first insulating layer having a through hole is formed on the glass substrate to expose the wiring and the wire, and the conductive layer connected to the wire through the through hole is the first layer. The present invention relates to an anode substrate formed on an insulating layer, wherein a second insulating layer is formed on the first insulating layer so as to surround the conductive layer, and a fluorescent layer is formed on the conductive layer.

By adopting such a structure, the through-holes drawn out to the outside are completely covered by the second insulating layer, which can prevent fluorescence staining in the pattern and can be prevented from sinking without forming dots, which is advantageous in the process. In addition, in the complicated model of the design, the through hole may be formed in the margin, and then the conductive layer and the wiring may be connected, and then the second insulating layer may cover the same. There is an effect that can form.

Description

Anode Substrate for Fluorescent Display

1 is a cross-sectional view of a conventional anode substrate for fluorescent display tubes,

2 is a cross-sectional view of a cathode substrate for a fluorescent display tube according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1 substrate 2 first insulating layer

3: second insulating layer 4: wiring

5: conductive layer (anode) 6: fluorescent layer

end. The technical field to which the invention belongs and the prior art in that field

The present invention relates to a positive electrode substrate for a fluorescent display tube, and more particularly, to a positive electrode substrate for a fluorescent display tube, the conductive layer is formed on the lower insulating layer and formed on the same surface as the upper insulating layer.

The generic name of the fluorescent display tube is VFD (vacuum fluorescent display), and an anode coated with a phosphor by accelerating hot electrons emitted from a direct-cathode cathode in which at least one surface is transparent. It is a kind of display device which makes a predetermined | prescribed pattern display by making it collide with and making it emit light. In the tube display tube, a triode structure having a grid for controlling the movement of electrons is mainly used.

Fluorescent display tubes are divided into various types according to various standards, and according to their structure, there are dipole tubes, triode tubes, and quadrupole tubes. Therefore, depending on the driving method, it can be divided into static driving and dynamic driving.

As described above, a general fluorescent display tube is composed of at least a cathode emitting electrons, an anode coated with a phosphor, and a vacuum tube including these two electrodes. It will be described in detail with reference to the drawings.

1 is a cross-sectional view of a lead-pin type anode substrate of a conventional mold display tube. As shown, the pattern of the metal wiring 4 is formed on the transparent substrate 1, such as glass, and has the same type of the first insulating layer 2 and the second insulating layer having through holes. 3) surrounds the wiring 4. An anode 5 formed on the second insulating layer 3 is connected to the wiring 4 through the through hole, and a fluorescent layer 6 is formed on the anode 5. A dot made of a material such as graphite is formed between the first insulating layer 2 and the second insulating layer 3.

However, in the anode substrate of the conventional fluorescent display tube as described above, there is a problem that fluorescent staining is likely to occur in the case of a segment type because the through hole is inside the pattern. However, there is a problem in that the design is limited when the through hole is pulled out. In the case of a dot type with dots, a fluorescent film is formed by an electrodeposition method or a printing method. However, when the electrode film is formed by an electrodeposition method, there is a problem in that a film thickness is poor depending on the thickness of the conductive layer.

I. Purpose of devising

The present invention is to overcome the problems as described above, by removing the through-holes and the secondary insulating layer to cover the through-holes to prevent the fluorescent stain generated in the pattern, even if the dot does not dare It is to prevent it.

All. Composition, function and effects of the devise

The structure of the present invention for achieving the above object is a transparent substrate, a wiring layer made of a conductive material formed on the substrate, the first insulation formed on the substrate and having a plurality of through holes in the portion where the wiring layer is located And a conductive layer formed on the first insulating layer to cover the through hole of the first insulating layer and connected to the wiring layer through the through hole, and formed on the first insulating layer and surrounding the conductive layer. A second insulating layer, and a fluorescent layer formed on the conductive layer.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement.

2 is a cross-sectional view of a cathode substrate for a fluorescent display tube according to an embodiment of the present invention.

As shown, the wiring 4 pattern is formed on the transparent substrate 1, and the 1st insulating layer 2 is formed on it. A conductive layer 5 to be an anode is formed on the first insulating layer 2 so as to cover the wiring 4, and a phosphor 6 is formed on the conductive layer 5. The first insulating layer 2 has a through hole so that the wiring 4 and the conductive layer 5 can be connected to each other. The second insulating layer 3 is formed on the first insulating layer 2 around the conductive layer 5.

In the exemplary embodiment of the present invention having the structure as described above, by removing the through hole to the outside and the second insulating layer 3 to cover it, it is possible to prevent the fluorescent stain formed in the pattern.

Next, the manufacturing method of the positive electrode substrate for fluorescent display tubes which has a structure as mentioned above is demonstrated in detail.

First, in order to perform a function as a container of a fluorescent display panel, a vacuum must be maintained and a side to be displayed must be transparent. Thus, a transparent glass plate having less gas permeation or emission is prepared to withstand atmospheric pressure. The prepared glass plate is cut | disconnected according to a specification, and it wash | cleans and dries sufficiently.

Next, a wiring pattern is formed on the glass substrate 1. There are two methods of forming the wiring pattern, a thick film method and a thin film method, and both can be used.

As the thick film material for wiring, silver (Ag), which has stability against oxidation and maintains high conductivity when fired in air, is often used. In the thick film method, a paste for fixing a paste having a maximum firing temperature of about 570 ° C. including glass having a low softening point is formed on the glass substrate 1 to form a wiring 4 pattern. .

In the thin film method, mainly aluminum (Al) is used. Aluminum is deposited on the glass substrate 1 and photo-etched to form a wiring 4 pattern. The sheet resistance of the aluminum film thus formed is generally 0.1 kPa / square or less.

Next, the glass dough made by mixing the glass powder and the solvent having a lower softening point than the glass substrate 1 is screen printed to a thickness of about 18 to 25 μm, particularly about 20 μm, and then about 10 to 20 minutes at a temperature of about 500 to 600 ° C. Firing is performed to form the first insulating layer 2. The insulating layer 2 serves to maintain insulation between the wiring 4 pattern and the conductive layer pattern to be formed in the next step. The through hole is provided at the wiring 4 pattern. It should be formed so that the wiring 4 pattern and the conductive layer pattern to be formed later are connected. In addition to insulation, the insulating layer also requires optical properties such as high contrast ratio, antireflection, and light shielding properties.

Subsequently, the graphite dough formed by mixing the graphite powder with an inorganic binder such as an aqueous alkali silicate solution is connected to the wiring 4 pattern through a through hole of the first insulating layer 2 to a thickness of about 26 to 32 μm. The conductive layer 5 pattern is printed as possible. Since graphite is heat resistant up to about 550 ° C. in air and does not easily ionize, graphite does not affect the phosphor and is mainly used as a conductive layer for anodes.

Next, the glass dough is screen printed to a thickness of about 18 to 25 μm to form the second insulating layer 2.

Finally, a phosphor paste mixed with a fluorescent substance and a vehicle which does not adversely affect its luminescence properties is formed to a thickness of about 29 ± 2 μm by printing or electrodeposition. In the fluorescent display tube, electrons are accelerated by applying a voltage of about 100 eV. At this time, the electron beam has a small penetrating ability with a penetration depth of about several tens of microwatts. For this reason, the fluorescent material used for the fluorescent display tube must satisfy a condition such as low resistance, which is called a slow electron beam excited light emitting phosphor. As the fluorescent material for fluorescent display tubes, compositions such as zinc (Zn) compounds, zinc, chlorine (Cl), copper (Cu), aluminum, and silver are used, and the conductive layer (5) is used to prevent the fluorescent layer 6 from falling off. It is good to increase the contact area with).

In this way, the first insulating layer and the second insulating layer are not formed in the same pattern, but the through holes drawn out in the outer part are completely covered by the second insulating layer by forming the first insulating layer, the conductive layer, and the second insulating layer in this order. This makes it possible to prevent fluorescence staining in the pattern. In addition, unlike the prior art, it is possible to prevent the depression without forming a dot, which is advantageous in the process.

In addition, in the complicated model of the design, the through hole may be formed in the margin, and then the conductive layer and the wiring may be connected, and then the second insulating layer may cover the same. There is an effect that can form.

Claims (5)

A transparent substrate, a wiring layer made of a conductive material formed on the substrate, a first insulating layer formed on the substrate and having a plurality of through holes in the portion where the wiring layer is located, so as to cover the through holes of the first insulating layer A conductive layer formed on the first insulating layer and connected to the wiring layer through the through hole, a second insulating layer formed on the first insulating layer and surrounding the conductive layer, and formed on the conductive layer A cathode substrate for a fluorescent display tube comprising a fluorescent layer present. The anode substrate of claim 1, wherein the first insulating layer is made of glass and has a thickness of 18 to 25 μm. The cathode substrate of claim 1, wherein the material of the conductive layer is graphite and has a thickness of 26 to 32 μm. The cathode substrate of claim 1, wherein the material of the second insulating layer is glass and has a thickness of 18 to 25 μm. The anode substrate of claim 1, wherein the fluorescent layer has a thickness of 27 μm to 31 μm.