JPH03233832A - Plasma display panel comprising porous metal plate as common cathode - Google Patents

Abstract

PURPOSE:To improve the sputter proof property and the discharge characteristic to make the assembly processability excellent by comprising a first electrode group and a second electrode group arranged in X-Y matrix through a dielectric layer, a third electrode group made of a porous metal plate and a porous insulating plate bulkhead interposing between the second electrode group and the third electrode group. CONSTITUTION:A plasma display panel consists of a front face glass plate 1, a third electrode (cathode) 2, a porous insulating plate bulkhead 3, a second electrode group (anode) 4, a dielectric layer 5, a first electrode group (trigger electrode) 6 and a rear face glass plate 7. The first electrode group (trigger electrode) 6 and the second electrode group (anode) 4 are arranged in X-Y matrix through the dielectric layer 5. The third electrode 2 and the porous insulating plate bulkhead 3 are pinched by two glass plates of the front face glass plate 1 and the rear face glass plate 7 and the surrounding thereof is sealed with sealing glass. The porous insulating plate bulkhead 3 is interposed between the second electrode group 4 and the third electrode 2. The assembly processability and the assembly accuracy are thereby improved, and while the sputter proof property and the discharge characteristic are improved, and furthermore, a lifetime can be prolonged without lowering of the cell opening ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an AC-DC composite plasma display panel consisting of three electrode groups, and more specifically, -electrode group (third electrode). is an integral electrode of a perforated metal plate, and the other two electrode groups (a plurality of first electrodes and a plurality of second electrodes) are arranged in an X-Y matrix through a dielectric layer, and - an electrode group and This invention relates to an FDP in which a perforated insulating plate is interposed as a partition between two electrode groups.

[Prior Art and Problems to be Solved by the Invention] Generally, the electrode material of a direct current discharge display panel (hereinafter abbreviated as DC-FDP) is a thick film N1. A transparent conductive film ITO is used as an anode and has been commercialized. However, the cathode surface formed with the thick film N1 has poor density and has problems in terms of service life.Also, as a cathode for DC-PDP, the discharge starting voltage is high, and it is not sufficient to resist sputtering due to ion bombardment in the plasma. I can't say that.

In order to deal with such problems, the present inventors came up with the idea of using a metal material. Metals have significantly higher density than thick film electrodes, and therefore the discharge characteristics and spatter resistance characteristics of metals themselves can be fully utilized. Examples of using metal thin plates as cathodes in DC-FDP have already been announced, but as shown in Figure 4, all of them are made by using a matrix of cells arranged in one direction, one in each column. It takes the form of lining up ribbon-shaped cathodes. In such cases, a plurality of ribbon cathodes are typically etched into the frame in the external region of the panel. It seems that the strength of the integrally molded part is maintained by the surrounding framework, but as the area increases, deflection due to its own weight cannot be ignored, and assembly workability becomes significantly worse, as well as assembly accuracy. There is a drawback.

Although the advantages of using metal materials have been discovered to date as described above, it can be said that a method for suitably introducing them into panels has not been established.

The present invention has been made to solve the problems of the prior art, and has excellent assembly processability and assembly accuracy, good spatter resistance and discharge performance, and a reduction in cell aperture ratio. The purpose of the present invention is to provide an FDP that can have a long service life.

[Means and effects for solving the problem] FD of the present invention
P includes a first electrode group and a second electrode group arranged in an X-Y matrix with a dielectric layer interposed therebetween, a third electrode made of a perforated metal plate, and the second electrode group and the third electrode. It is characterized by comprising a perforated insulating plate partition wall interposed therebetween.

Hereinafter, the FDP of the present invention will be specifically explained based on the drawings.

FIG. 1 is a perspective view showing each component of the FDP of the present invention and an assembled state, and FIG. 2 is a longitudinal sectional view of the FDP of the present invention. The FDP shown in FIGS. 1 and 2 includes a front glass plate 1,
Third electrode (cathode) 2, perforated insulating plate partition 3, second electrode group (
anode) 4, dielectric layer 5, first electrode group (trigger electrode) 6
, a rear glass plate 7.

As shown in FIGS. 1 and 2, the first electrode group (trigger electrode) 6 and the 21st! ! ! The electrode group (anode) 4 is a dielectric layer 5
They are arranged in an X-Y matrix via.

The first electrode group 6 and the second electrode group 4 include Nl
, Au, AJ, Ag thick film electrode, N1゜Au, AJ,
A thin film electrode made of Ag, ITO, etc. or a ribbon-shaped thin metal plate can be used. Considering the structural constraints of forming the dielectric layer 5 between the first electrode group 6 and the 211th electrode group 4, the accuracy of electrode formation, cost, durability in the discharge space, etc., which is the most advantageous? All you have to do is choose the material.

Further, as a method for forming the dielectric layer 5, a thick film method, a thin film method, etc. can be used. An advantageous method may be selected in consideration of manufacturing costs, etc., but generally a thick film method is used.

This dielectric material is Pb 0-B203-5i02
, Zn 0-B203-8t 02, etc., and if necessary, ceramics such as A4203 or Fe 0-
A paste prepared by kneading 100 parts by volume of a powder obtained by mixing and pulverizing pigments such as Cr203 and Co0-AJ203 with 10 to 30 parts by volume of a vehicle is used. The dielectric layer 5 is formed by forming this paste on the first electrode 6 by screen printing and baking it at a predetermined temperature.

In the present invention, the third electrode (cathode) 2 has a wall thickness of 0.0
5-1. (A metal plate with holes of about Is is used.

The shape and arrangement of the holes are determined depending on the purpose of use, for example, the 5 x 7 dot character shown in Figures 4 to 6.
Display, full dot display in delta array, 8 of 7 segments
In addition to the double dot display, there is also a full dot display of 640 x 480 dots. Note that the reference numbers in FIGS. 4 to 6 are the same as in FIGS. 1 to 2.

This third electrode 2 is sandwiched between two glass plates, a front glass plate 1 and a rear glass plate 7, together with a perforated insulating plate partition 3.
The periphery is sealed with sealing glass (not shown). Therefore, the third electrode 2, the perforated insulating plate partition 3, the two glass plates 1,
7 and the sealing glass should have approximately the same coefficient of linear thermal expansion. Otherwise, excessive stress will be applied to the glass during the cooling process after sealing, leading to breakage. Generally, the two glass plates 1 and 7 are made of soda lime glass, so it is desirable that the linear thermal expansion coefficient of the third electrode 2 is 80 to 100 (X 10-'/'C). . Specific examples of such metal materials include 42% by weight N1-6% by weight Cr-Fe alloy, 50% by weight N1-Fe alloy, and the like.

Of course, if a glass having a linear thermal expansion coefficient different from the above is used, the metal material may be selected accordingly.

In the present invention, a perforated insulating plate partition 3 is interposed between the second electrode group 4 and the third electrode 2 described above.

This perforated insulating plate partition wall 3 is made by thick film printing of glass paste.
It is obtained by etching photosensitive plate glass, drilling holes in plate glass, etc., and improves processability, panel assembly processability, cost,
The selection may be made in consideration of adaptability to higher definition, etc. In the present invention, the grid-shaped dielectric described in Japanese Patent Application No. 1-269153, in which a dielectric of 1 to 100 μm is coated on the surface of a grid-shaped metal plate, is preferably used as the perforated insulating plate partition 3.

The method for manufacturing this lattice dielectric composite is described in the above-mentioned patent application No.
It is detailed in the specification of No.-289153.

Next, an example of the FDP driving method of the present invention will be explained.

As shown in FIGS. 1 and 2, the cell structure of the FDP of the present invention has holes located at positions such that each cell has one intersection point between the first quadrupole group 6 and each electrode of the second electrode group 4. An insulating plate partition 3 is formed, and the third electrode 2 is placed directly above the perforated insulating plate partition 3. The cross section of the metal electrode that is the third electrode 2 that is exposed to the cell space acts as an electrode. Here, referring to the auxiliary discharge mechanism generally employed in DC-PDPs, the problem with DC-FDPs is that when a voltage is applied between the anode and cathode, the discharge does not occur immediately and there is a delay in the start of discharge. There is.

To deal with this problem, charged particles are supplied to the discharge cell space in advance to stabilize the operation or to reduce the driving voltage (for example, Japanese Patent Laid-Open No. 58-30038, Japanese Patent Laid-Open No. 55 -1411348 Publication, Japanese Patent Application Publication No. Sho H-19
Publication No. 3235).

In the present invention as well, the panel is driven by utilizing the phenomenon that the discharge starting voltage decreases by supplying charged particles.

In the AC-DC composite FDP according to the present invention, the discharge starting voltage vf and the minimum discharge sustaining voltage Vs, which are expressed by the relationship between the discharge voltage and the Pd product (Paschen's law) as shown in FIG.
A voltage equal to the discharge sustaining voltage Vs between sin is applied between the anode and the cathode, and charged particles are supplied only to the selected cell,
- It takes advantage of the fact that the discharge starting voltage of the cell drops to vf' from time to time. That is, only the selected cell satisfies the discharge start condition and lights up. The method for supplying charged particles to a selected cell is to supply charged particles to a first electrode group 6 (trigger electrode) arranged orthogonally through a dielectric layer 5 in synchronization with the timing of line-sequential scanning using the second electrode group 4 as an anode. Apply data write pulse voltage.

At that time, a potential difference corresponding to the difference between the scanning voltage of the anode and the writing voltage of the trigger electrode is generated only in the cell to which the data write pulse voltage is applied on the selected second electrode (anode), and discharge starts. Enough charged particles are supplied to reduce the voltage to Vr'. Therefore, in the next step the second
With respect to the discharge sustaining voltage Vs applied between the electrode group 4 (anode) and the third electrode 2 (cathode), only the cells to which data has been written light up, and the cells to which no data has been written light up.
It does not light up because the discharge start conditions are not met.

An image can be displayed by performing the above process by sequentially scanning each anode one by one and writing data.

In this way, in the FDP of the present invention, since the cathode is an integral electrode common to all cells, the normal X-Y matrix DC
-Since it cannot be driven like a PDP, it has a three-electrode structure and selects cells by indirect discharge between an anode and a trigger electrode.

〔Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 The perforated insulating plate partition wall was produced by the following method.

The basic lattice metal has a coefficient of linear thermal expansion of 92 (
A 42 wt.% N1-8 wt.% Cr-F6 alloy with a The thickness of the metal plate was set to 0.1, the groove pitch was 0.2 am both vertically and horizontally, and the hole size was 0.15×O, Lm. A large number of holes were formed by etching to obtain a lattice-shaped metal plate.

The dielectric material has a softening point of 800" C1 average grain size of 2~
3. Zn0-B203-3l02 type glass powder of czm and inorganic fillers such as Al103 and Fe0-Cr203 were used.

The dielectric was deposited in an electrodeposition solution using a lattice metal plate as an anode and a metal plate made of the same material and having a similar area as a cathode. The voltage used was constant at 200 V DC.

As a result, the electrodeposited state and the strength of the electrodeposited layer were also extremely good.

This sample was heated to the softening point of glass powder of 600°C in the air.
By firing at a higher temperature, the dielectric layer was made into a dense film, and a lattice-shaped dielectric composite with an electrodeposition layer thickness of 10 μm was obtained.

Soda lime glass was used for the front glass plate and the back glass plate material. Each member was formed on the back glass plate in the following order.

In other words, the first electrode is thin! IAj is shaped into a stripe shape with a line width of 0.1 am at a pitch of 1.2 m,
A dielectric layer was formed thereon by mixing ZnO-B203sio2-based glass powder with a small amount of Al2O2 and kneading it with a vehicle to form a paste, which was solid printed using a screen printing method and fired at 580°C. Next, N1 paste was used as a second electrode on the dielectric layer in a direction perpendicular to the first electrode, and was formed into a stripe shape with a line width of 0.1 am at a pitch of 0.2 aa+ by screen printing, and heated to 580°C. and fired. Furthermore, the second electrode at the intersection of the first electrode and the second electrode is
A phosphor was coated on the electrode.

As the perforated metal plate electrode serving as the third electrode, a metal plate made of the same material and having the same shape as the base metal of the perforated insulating plate partition wall was used.

Next, the perforated insulating plate partition wall obtained as described above is placed on the back glass plate, which is then sandwiched between the front glass plates on which the perforated metal plate electrodes are arranged, and sealed with a low-melting glass frit. After evacuation and gas filling through the tube, the chip tube was sealed off to create an FDP. The gas used was He-Xe (2%) 300T orr.

Example 2 An FDP was produced in the same manner as in Example 1 except that the first electrode was changed to Ag by screen printing among the materials shown in Example 1.

Comparative Example 1 A cathode material in which a plurality of ultra-thin ribbon-shaped Ni strips were lined up at an equal pitch was used, a transparent conductive film (ITO) was used as an anode material, and the partition wall was the same as that used in Example 1. An FDP was fabricated using a similar perforated insulating plate partition. FIG. 4 is a perspective view showing each component of this FDP and its assembled state. The FDP in the figure includes a front glass plate 1, a cathode 21, a perforated insulating plate partition 3, an anode 41. It is composed of a back glass plate 7.

That is, on the inner surface of the front glass plate 1, ITO (anode 4
1) is formed in a stripe shape with 0.21s+pitch,
A ribbon-shaped N1 (cathode 21) is arranged on the rear glass plate 7 in a direction perpendicular to the ITO, and the partition wall 3 is connected to both glasses so that each intersection of the ITO and the ribbon-shaped N1 enters the discharge cell. It is sandwiched between plates, the periphery is sealed with a low melting point glass frit, the chip tube is evacuated and gas is filled, and then the chip tube is sealed to produce an FDP.

However, in such an FDP, it is very difficult to arrange the ribbon-like N1 at a high-definition pitch, and it cannot be said to be suitable for mass production.

Comparative Example 2 Thick film N1 was used as the cathode material, and transparent conductive film (IT) was used as the anode material.
An FDP was produced using the same perforated insulating plate partitions as those used in Example 1, and the same conditions as in Example 1, such as the cell pitch and gas filling.

However, since this FDP uses screen printing to form the cathode, it is suitable for mass production, but the thick N1 film has poor density and has a problem in terms of life compared to metal electrodes.

Experimental Examples The PDPs obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated for cathode spatter resistance, cathode current density, discharge sustaining voltage, and processability (mass productivity), and the results are shown in Table 1. It was shown to. The evaluation symbols in Table 1 are as follows.

◎: Very good ○: Slightly excellent Δ: Slightly poor X: Poor Table As shown in this Table 1, Examples 1 and 2 had good results in all evaluation items. is obtained.

On the other hand, in Comparative Example 1, the current density of the cathode was high and the workability was poor. On the other hand, in Comparative Example 2, the cathode had poor spatter resistance and also had a high current density.

[Effect of the invention] The present invention as described above has the following effects.

(1> Since the third electrode (cathode) surface has a density that cannot be obtained with the thick film N1, spatter resistance and discharge characteristics are improved.

(2> Since the third electrode is a perforated metal plate, a thin plate (50μ
Even if the size of the metal plate is small, the assembly workability is much better than that of a ribbon-shaped metal plate.

(3) Since the cross section of the perforated metal plate acts as a cathode, the aperture ratio does not decrease even if the cathode is placed on the front side of the cell space.

(4) In the cross-section of the perforated metal plate, all four sides surrounding the cell act as cathodes, allowing for a large cathode area, which makes it possible to lower the current density, resulting in a longer life.

[Brief explanation of drawings]

Figure 1 is a diagram of the components and assembly of the FDP, Figure 2 is a cross-sectional view of the cell along the anode direction of the FDP, and Figure 3 is the product of the discharge voltage (V), gas pressure, and discharge gap amount (P) in the FDP. xd) relationship diagram (Paschen curve), Figure 4 is an example of a 5x7 dot character display FDP, Figure 5 is an example of a delta array full dot display FDP, Figure 6 is an example of a 7 segment display FDP, FIG. 7 is a diagram showing the components and assembly of a conventional FDP that uses a ribbon-shaped metal plate for the cathode. : Front glass plate, 2: Third electrode (cathode): Perforated insulating plate partition, : Second electrode group (anode), 5: Dielectric layer, 2nd first electrode group (trigger electrode), : Rear glass plate. Figure Pd (Torr-crn) Figure 4 Figure 7 Figure 7 March 23, 1990

Claims (1)

[Claims] 1. A first electrode group and a second electrode group arranged in an X-Y matrix with a dielectric layer interposed therebetween, a third electrode made of a perforated metal plate, and the second electrode group. and a perforated insulating plate interposed as a partition between the third electrode and the third electrode. 2. The linear thermal expansion coefficient of the perforated metal plate is 80 to 100 (×
10^-^7/°C). The gas discharge type panel according to claim 1.