JPS60230336A - Manufacture of electric discharge display device - Google Patents

Abstract

PURPOSE:To enable a good trigger electrode to be made by printing a glass paste on a glass base plate before an Al paste is printed in a given pattern on the glass paste layer, followed by simultaneously sintering these layers. CONSTITUTION:First, a low-melting glass paste layer 11 is formed on a back glass base plate 3 by screen printing, then the layer 11 is temporarily dried. Next, an Al paste layer 12 with the same pattern as a trigger electrode to be formed is formed on the glass paste layer 11 by screen printing, then the layer 12 is temporarily dried. After that, the thus formed layers 11 and 12 are simultaneously sintered in air at a temperature of about 600 deg.C, thereby making a good Al trigger electrode 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a trigger discharge type discharge display device, and in particular to the formation of a trigger electrode thereof.

BACKGROUND ART AND PROBLEMS In recent years, development of discharge display devices, particularly XY matrix direct current discharge display panels (plasma display panels FDP), has been progressing.

FIG. 1 is a configuration diagram of a trigger discharge type DC discharge display panel previously developed by the present applicant.

This display panel (1) consists of a front glass substrate (2), a rear glass substrate (3), and an XY matrix-shaped anode (4) and a cathode (5) sandwiched between these.
are separated by an insulating barrier (6). On the rear glass substrate (3), an insulating dielectric layer (
Via 7) a trigger electrode (8) is provided parallel to the cathode (5).

The display panel (1) is manufactured in the usual manner. First, an anode (4) and an insulating barrier (6) are formed on a front glass substrate (2) by a thick film printing method. Further, a trigger electrode (8), an insulating dielectric layer (7) and a cathode (5) are sequentially formed on the rear glass substrate (3) by a thick film printing method. After printing, each of these constituent parts is fired. Next, these two glass substrates (2) and (3) are connected to the anode (4).
) and the cathode (5) are disposed facing each other perpendicularly and are frit-sealed. Thereafter, it is completed through processes such as heating and exhausting, gas filling (for example, Ne-Ar gas), and final sealing.

In such a discharge display panel (1), a driving voltage is selectively applied to the anode (4) and the cathode (5), so that the intersection between the selected anode (4) and the cathode (5) The light is emitted by discharge and displayed, for example, in a line-sequential manner.

In particular, this display panel (1) has an anode (4) and a cathode (5).
) A trigger voltage is applied to the trigger electrode (8) prior to the main discharge between the trigger electrodes (8), thereby inducing a wall voltage on the insulating dielectric layer (7) at a portion corresponding to the trigger electrode (8),
``An instantaneous discharge occurs between this and the selected cathode (5), and the gas space along the cathode (5) is ionized, thereby creating a subsequent discharge between the selected anode (4) and the cathode (5). is facilitated.

By the way, Ag paste (sieve paste in special cases) has conventionally been used to form trigger electrodes in such discharge display panels. However, as is well known, when the above-mentioned glassy insulating dielectric layer (7) is formed on the heg paste, migration into the insulating dielectric layer (7) occurs. This phenomenon is caused by alkali ions and A
This is clearly seen as interdiffusion due to ion exchange of g ions. Furthermore, even in alkali-free lead borosilicate glass, 8g tends to be ionized when voltage is applied to the insulated dielectric FW (7) via the trigger electrode, reducing ionic PB in the glass. It is thought that it penetrates into the interior. That is, a major drawback of using a heg electrode is that it easily causes breakdown of the insulating dielectric JM (7). Therefore, the thickness of the insulating dielectric layer (7) on the trigger electrode (8) must be made thicker than the above-mentioned discharge display (% 4), and accordingly Dielectric capacitance decreases. As a result, the wall voltage (i.e., the amount of charge) induced on the surface of the insulating dielectric layer (7) that acts as a trigger decreases, so the voltage applied to the trigger electrode (8) has to be increased, a vicious cycle that repeats. become.

On the other hand, the present inventors have investigated the use of vapor-deposited films such as Ag and Cr, or Ni.
Using paste, Cu paste, etc., attach the trigger electrode (8
), but none of them yielded favorable results. In other words, in the case of a vapor deposited film, the second
As shown in the figure and FIG. 3, the terminal portion (8a) of the trigger electrode (8) undergoes oxidation during firing in air, so a different material must be used for that portion. At that time, if heg paste is used, it acts as an oxidizing agent of 8g at the joint with the electrode, and 11j! , Cr is oxidized and cannot be electrically conductive. This is possible with N1 paste, but in this case plistering (foaming) occurs at the joint. Further, it requires a large-sized device, cannot cope with the increase in the size of discharge display panels, and is difficult to obtain a uniform and well-adhered film over a large area. In addition, in the case of the old in-air firing type paste, m multi-layers are used as the insulating dielectric layer (7), but after the second layer is fired, pristering occurs at the adhesive surface between the terminal part (8a) and the glass substrate (3). Also, a vacuum leak occurs at the frit seal portion (9), making it difficult to use. Further C
In the case of U-paste, there is currently no good low-temperature air firing type, and even if one were made, the problem of oxidation at the exposed terminal portion (8a) would remain.

OBJECTS OF THE INVENTION The present invention provides a method for manufacturing a discharge display device in which the above-mentioned drawbacks are improved and a good trigger electrode can be formed.

Summary of the Invention In the present invention, after printing a glass base paste on a glass substrate, an Al paste is printed thereon in a predetermined pattern and simultaneously fired to form a trigger electrode.

This manufacturing method provides a trigger electrode that does not cause migration and has strong adhesion to the glass substrate. Therefore, the manufacturing yield of discharge display devices is improved.

Example The present invention will be explained in detail below.

In the present invention, first, as shown in FIG. 4A, a low melting point glass paste layer (11) is screen printed on the rear glass substrate (3) and temporarily dried.

Next, as shown in FIG. 4B, this glass paste 1id (
11) Apply a paste layer (12) on the screen in the same pattern as the trigger electrode to be formed, and temporarily dry it.

Next, as shown in FIG. 4C, this glass paste layer (11
) and AN paste layer (12) in air at, for example, 600°C.
Simultaneously fired at a temperature of If the firing temperature exceeds 620°C, oxidation will progress and the resistance value of the trigger electrode after firing will increase, which is not preferable. This firing process forms a AN) rigger electrode (8). At the same time, a glassy base layer (1
3) is formed, and the trigger electrode (8) is strongly adhered to the glass substrate (3) by this underlayer (13).

Next, as shown in the fourth diagram, an insulating dielectric layer (7) is formed on the electrode part (8b) leaving the terminal part (8a).

This insulating dielectric layer (7) is formed into a four-layer laminated structure by repeating screen printing and firing (for example, at 560° C.) using glass paste.

Next, as shown in FIG. 4E, a cathode (5) is formed on the insulating dielectric layer (7) by thick film printing.

On the other hand, although not shown, an anode (4) and an insulating barrier (6) are formed on the front glass substrate (2) by a thick film printing method as usual. After this, as mentioned above, two glass substrates (2
) and (3) are frit-sealed and completed through processes such as heating exhaust, gas filling, and final sealing. Note that the anode (4) in this case is made of Ni, and the cathode is made of LaB on Ni.
5 is applied.

In this manufacturing method, the initial resistance value of the trigger electrode is 7Ω when fired at 600°C using AI paste, and thereafter, when forming the insulating dielectric layer (7) of the four-layer structure, each layer is 7Ω to 9Ω.

The resistance increased to 14Ω, 18Ω, and became 22Ω after 4i.

This resistance value is sufficient for use. And A
Since it is a trigger electrode, no migration occurs, and especially the exposed terminal part (8) of the trigger voltage (8)
In case a), it was also strongly adhered to the glass substrate by co-firing with the glass substrate 1'1W (13). Furthermore, no abnormality was observed in the vacuum leak at the frit seal section.

In the surface example, the trigger electrode (8) including the terminal portion (8a)
A glass base layer (13) was formed on the entire surface of the glass substrate (13), but after frit-sealing at least two other glass substrates (21, (31), a glass base layer (13) was formed only under the terminal part exposed to the outside where there was a problem with adhesion. A textured base 1it (13) may also be formed.

Effects of the Invention According to the present invention described above, since the trigger electrode is formed using AN paste, deterioration in dielectric strength voltage due to migration such as Ag does not occur. As a result, it is possible to reduce the layer thickness of the insulating dielectric layer, and the trigger voltage can be reduced. In addition, when forming the Al trigger electrode, AA paste was printed on the glass base paste layer,
Co-firing increases the adhesive strength with the glass substrate.

Furthermore, when using paste, the resistance value is sufficient to withstand use, unlike when using the vapor deposition method. Therefore, the production yield of this type of trigger discharge type discharge display waveform is improved.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a discharge display panel used for explaining the present invention, FIGS. 2 and 3 are sectional views and plan views showing essential parts thereof, and FIGS. 4 A to E are views of the present invention. FIG. (2) is the front glass substrate, (3) is the back glass substrate, (
4) is an anode, (5) is a cathode, (7) is an insulating dielectric layer, (8
) is the trigger electrode, (11) is the glass paste layer, (1
2) is the paste layer, and (13) is the glassy base layer. ,'7''1.1 Agent Sada Ito''1. Figure 1 - Figure 2 Figure 8

Claims (1)

[Claims] A method for manufacturing a discharge display device, in which a glass base paste is printed on a glass substrate, an AJ paste is printed thereon in a predetermined pattern, and a trigger electrode is formed by simultaneous firing.