KR930004994B1 - Plasma display paneled of manufacturing - Google Patents

Abstract

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Description

Plasma Display Panel, Manufacturing Method And Bulkhead

1 is a diagram showing an example of a PDP using lattice-shaped partition walls in an X-Y matrix array.

2 is a diagram showing an example of a PDP using a stripe-shaped partition wall in an X-Y matrix array.

3 is a diagram showing an example of a PDP using a circular partition in an X-Y matrix array.

4 is a diagram showing an example of a PDP using a partition of a delta array.

5 is a diagram showing an example of a PDP using a seven-segment partition.

6 is a view showing the components of a DC-type PDP as an example of the present invention and assembly thereof.

7 is a constituent part of a DC-type PDP which is another example of the present invention, and an assembly diagram thereof.

8 is a plan view after PDP assembly.

FIG. 9 is a vertical sectional view when the section A-A 'of FIG. 8 cuts the cell space. FIG.

FIG. 10 is a vertical sectional view when the section A-A 'of FIG. 8 cuts a partition.

11 is a component and assembly diagram of a DC-type PDP as another example of the present invention.

12 is a structural sectional view of one cell of the PDP of FIG.

13 is a view illustrating the assembly and the construction of a DC-type PDP as another example of the present invention.

FIG. 14 is a cross-sectional view of the cell along the anode direction of the PDP of FIG. 13;

* Explanation of symbols for main parts of the drawings

1: Front glass plate 2: Insulation layer (dielectric layer)

3: bulkhead 4: grid-shaped bulkhead

5: back glass plate 6: anode

7: cathode 8: spacer

9: seal glass (sealing glass) 10: stripe dielectric

11: phosphor 12: third electrode group (cathode)

13: 2nd electrode group (anode) 14: 1st electrode (triker electrode)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel using a porous metal plate as a partition and a spacer, a method of manufacturing the same, and a partition.

In recent plasma display panels (hereinafter referred to as PDPs), in order to flatten the panel, two substrates are stacked at appropriate intervals, and the envelope is sealed with a sealing glass. It is a type of liquor that consists of gas and sealed gas. Since the front surface of two board | substrates requires a glass plate, and another back plate also is inexpensive, the same kind of glass plate is used. Therefore, a description will be given of such a type of PDP.

In the production of the PDP, the gas is exhausted prior to gas encapsulation, but at this time, the pressure difference inside and outside the envelope reaches a maximum. Due to this pressure difference, two glass substrates deform. This deformation is larger because it is heated to release the adsorbed gas in the envelope. In order to suppress this deformation to a negligible extent, it is necessary to enlarge the thickness of a glass plate or to make a panel small. If the spacer is formed between two glass plates, such a restriction is eliminated. Therefore, the spacer is indispensable for a large display panel.

In general, in a PDP in which a plurality of discharge cells are arranged, only a discharge type of AC type or DC type is used. In order to secure an appropriate discharge gap or to prevent crosstalk to adjacent cells, a partition wall is used. Or a spacer is required.

By the way, the arrangement of the discharge cells of the PDP is determined depending on the purpose of use, and there are, for example, 8 character display of 7 segments, 5 x 7 dot character display, and 640 x 480 dot full dot display.

1 to 5 show examples of discharge cell arrangement of these PDPs. In Figs. 1 to 5, (1) denotes a front glass plate, (3) a partition wall, (5) a rear glass plate, (6) an anode, and (7) a cathode. As shown in these figures, barrier ribs and spacers having various shapes and arrangements of cell holes (hereinafter, collectively referred to as barriers in some cases) are used. In any cell arrangement, a partition wall can be formed by the same method, and various methods have been tried up to now, for example, as shown below.

Method A: Thick film method (multi-layer printing of screen printing)

Method B: Etching of Photosensitive Plate Glass

Method C: Machining of Plate Glass

Among them, the method A is inexpensive and excellent in mass productivity, but there is a drawback that a sufficient discharge gap cannot be obtained without repeated printing a plurality of times. In particular, in the full-dot display PDP, the high precision of the dot pitch (for example, the dot pitch of 0.2 mm) is an important task, but it is difficult to cope with screen printing. In the stripe shape as shown in Fig. 2, there is an example realized (Y.Amano: SID Int Symp.Dig.Tech.Paper.p.160 (1982)), and the discharge as shown in Figs. Bulkheads, such as those that completely enclose a cell from the surroundings, are particularly difficult to respond, require very advanced techniques and are not practical.

As described above, when there is a partition that completely surrounds the discharge cell from the surroundings (hereinafter, referred to as a completely closed partition) and a stripe-shaped portion where there is no partition between adjacent cells even in one direction (hereinafter, incomplete closure). In the following meaning, there is a big difference in the partition wall.

For example, when the luminescent color of the noble gas itself is used, such as a PDP of orange luminescence color caused by the discharge of neon gas, its emission is limited only near the electrode of the selected cell, and thus has been put into practical use as an incomplete closure. However, when the light emitting cell spacing becomes small, adjacent cells tend to cause false discharge. In the case of considering a multi-color or full-color PDP, a method of exciting the phosphor by the ultraviolet rays accompanying discharge is taken, so that the phosphors of adjacent cells are leaked by the incompletely closed partition wall. May emit light here. In other words, crosstalk or color bleeding cannot be avoided, color reproducibility and resolution are impaired, resulting in low value as a display. In view of this, the method A is not suitable for making a high-precision, fully closed bulkhead, and is not practical to correspond to a color PDP.

Although it is considered that the method B is relatively easy to cope with high-definition, it is expensive and inexpensive because it is made of a very special photosensitive glass material. Moreover, assembling a thin glass plate with a thickness of 0.1 to 0.5 mm is easy to break the glass and practically difficult.

For the C method, ordinary glass can be used, and it is difficult to machine a high-precision cell pitch, and assembly is similarly difficult.

Therefore, conventionally, barrier ribs and spacers that can cope with the high precision of the PDP, have a suitable discharge space, and are relatively inexpensive and have excellent mass productivity have not yet been found.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art, and an object thereof is to provide a PDP, a manufacturing method thereof, and a partition wall, which can cope with high precision and are excellent in economy and mass productivity.

The above object of the present invention is achieved by using a perforated metal plate as a partition or spacer and forming an insulating layer between the perforated metal plate and an electrode.

That is, the PDP of the present invention is characterized in that a porous metal plate having a thickness of 0.01 to 1.0 mm is used as a partition wall or a spacer, and has an insulating layer for electrically discharging the discharge electrode on the front plate and / or the rear plate and the porous metal plate. .

Fig. 6 shows the components and the assembly midway of the DC type PDP as one example of the present invention.

In the drawing, the positive electrode 6 is formed on the front glass plate 1, and the negative electrode 7 is formed on the rear glass plate 5, respectively. In addition, between the front glass plate 1 and the rear glass plate 5, a lattice-shaped partition wall 4 made of a perforated metal plate is disposed, and the anode 6 or the cathode 7 and the lattice-shaped partition wall 4 are electrically insulated from each other. The insulating layer 2 is located between the front glass plate 1 or the rear glass plate 5 and the lattice-shaped partition wall 4.

In addition, when the components and the assembly midway of the DC-type PDP, which is another example of the present invention, are shown in Fig. 7, the plan view after assembly is shown in Fig. 8, and the AA 'end face of Fig. 8 cuts the cell space. A cross-sectional view is shown in FIG. 9 and a vertical cross-sectional view in the case where the AA 'front end section of FIG. 8 cuts the partition wall is shown in FIG. The code numbers in Figs. 7 to 10 are the same as those in Fig. 6. In addition, a dielectric layer is deposited on the lattice-shaped partition wall 4 made of a porous metal to form an insulating layer. (8) shows a spacer, and (9) shows a seal glass, respectively.

In the present invention, the metal material composition of the perforated metal plate serving as the partition wall or the spacer is an alloy containing at least one element selected from Fe, Co, Ni, and Cr, and the coefficient of linear thermal expansion is 40 to 100 x 10. It is preferable that it is ^-7 / degreeC (25-500 degreeC). The thickness of these metal plates is 0.01-1.0 mm, Preferably the thing of 0.05-0.1 mm can be used.

By the way, since a partition and a spacer are inserted in two glass plates and gas is enclosed inside, a circumference is sealed with sealing glass. Therefore, the coefficients of linear thermal expansion of the partition (spacer), the two glass plates, and the encapsulating glass should be approximately the same or approximate. Otherwise, the glass is excessively stressed in the cooling process after sealing, leading to breakage.

Generally, when two glass plates are soft glass, it is preferable that the coefficient of linear thermal expansion of a metal plate is 80-100x10 <^-7> / degreeC (25-500 degreeC) according to this. As a suitable metal material composition, 42 weight%, Ni-6 weight% Cr-Fe alloy, 50 weight% Fi-Fe alloy etc. are illustrated. When a glass plate is hard glass, it is preferable that the linear thermal expansion coefficient of a metal plate is 40-60x10 <^-7> / degreeC (25-500 degreeC) according to this. As a suitable metal material composition, 20 weight% Ni-17 weight% Co-Fe alloy can be illustrated. Of course, in the case where a coefficient of thermal expansion of the glass member to be used is different from that described above, the material of the partition wall may be selected according to this.

In the selection of the metal material composition, in addition to the linear thermal expansion coefficient, price, workability, and mechanical properties are taken into consideration, but heat resistance in the encapsulation step is required. Usually sealing process is performed at 400-500 degreeC, but the above-mentioned alloy can fully be used about this temperature. The encapsulation process is easy to carry out in an air atmosphere. In this case, the oxidation resistance of the metal material becomes a problem, but the alloy of the above examples can be sufficiently used. In a metal material having a problem of oxidation resistance, the encapsulating atmosphere can be used as non-oxidizing property, and an oxide film can be formed by well-known metal surface treatment.

As a method of processing a predetermined hole pattern on the metal plate, a punching method by a press, a laser processing method, a plating method, a welding method, an etching method, or the like can be used. Although the most advantageous processing method may be used in consideration of processing distortion, processing precision, processing cost, etc., in general, an etching method is preferably used.

The perforated shape and arrangement of the perforated metal plate are arbitrary. For example, a lattice shape, a stripe shape, a circle shape, a telter arrangement, a seven segment type, and the like shown in Figs. 1 to 5 are exemplified. The shape which becomes a high precision fine closed partition which is shown in FIG. Is preferable, and the lattice shape shown in FIG. 1 is especially preferable.

By the way, in the high precision panel with dot pitch of 0.6 mm or less, since the display invalid part increases by a partition, the aperture ratio of a display cell is a problem. In high-precision panels, the partition height is 100-200 micrometers normally. As described above, this is the range to which the realistic bulkhead making method, that is, thick film printing method, is applied. If it is lower than 100 μm, the influence of the negative electrode spatter is increased in the case of DC type, and in general, it is disadvantageous to uniformize discharge characteristics over a large number of cells. Anything higher than 200 μm increases the number of times of printing, resulting in a high cost. It is difficult to narrow the partition width that affects the opening ratio as the partition wall is higher. Considering the height of the partition wall is about 100 µm, the minimum partition width that can be formed by thick film printing is about 80 µm in the stripe shape and about 150 µm in the lattice shape. In the completely closed bulkhead using the porous metal plate of the present invention, the minimum bulkhead width is about 50 µm, about 20 µm, and about 100 µm thick, and about 30 µm, respectively, by the etching described above. Therefore, the aperture ratio of 100 μm-tight closed bulkheads in the form of a square lattice of 0.6 μm pitch is about 56% by thick film printing and about 90% by one sheet of porous metal plate. Have This becomes larger as the dot pitch becomes smaller. In addition, when the porous metal plate is thinned and combined, a larger aperture ratio is formed.

In the present invention, a porous metal plate processed in the desired shape is used as a partition wall, but at this time, a discharge electrode is disposed on the front plate and / or the back plate, and the electrode may be covered with a dielectric such as an AC PDP. When the electrode is exposed to the discharge space, such as a DC-type PDP, the electrode and the hole metal plate (bulk wall) are electrically inserted between the front plate and the back plate, while being sealed. Will be shorted.

That is, between the anode, cathode, and anode-cathodes of the PDP are electrically shorted, and the discharge light emission does not occur. Thus, in the present invention, the above-described problems can be solved by forming an insulating layer between the porous metal plate (bulk) and the discharge electrode.

This insulating layer may be formed on the electrodes of the front plate and the back plate, or may be formed on the surface of the porous metal plate (the partition wall) in contact with the electrodes, or both. do. Moreover, you may form an insulating layer in the perforated metal plate itself.

In order to deposit the insulating layer, various techniques such as spray method, printing method, electrostatic coating method, dipping method, anodic oxidation method, thermal oxidation method, spatter method, thermal spraying method and electrodeposition method are applied, and the cost and performance are considered. To select. The following two methods are preferred.

That is, the first method is an electrodeposition method, whereby almost the entire surface of the perforated metal plate can be covered with a dielectric to form an insulating layer. The electrodeposition method is achieved by dispersing a glass and glass dielectric powder in a solution containing an electrolyte as one electrode and applying an electric field. The powder particle diameter varies depending on the required insulating layer, but 0.1 to 5 µm is preferably used. As the dispersion, isopropyl alcohol, Al ₂ (NO ₃ ) ₃ , Ba (NO ₃ ) ₂ , and the like can be exemplified, but it can be selected from many known ones. The powder is electrodeposited, heated to melt the glass, and a dense insulating layer adheres to almost the entire surface of the porous metal plate. If the thickness of the insulating layer is large, the discharge cell space is small, which is not preferable. Usually, the thickness of an insulating layer can be preferably used in 1-10 micrometers. If the insulating layer is applied to almost the entire surface of the perforated metal plate, insulation with the discharge electrode is taken, and further has the following advantages. In general, when the barrier rib is composed of only a dielectric material, the conductive material is sputtered by discharge, and even if deposited on the dielectric material, the amount thereof is small, so that short-circuit between electrodes is not a problem. However, if the perforated metal plate is used as the partition wall as in the present invention, and the insulation distance between the electrode and the perforated metal plate is short, the risk of short circuit increases by that much. According to the electrodeposition method, it can be carried out similarly to the conventional structure in which the partition wall is formed of a dielectric, and there is no risk of short circuit.

The second method is a method of transferring to the surface of the porous metal plate of the insulating layer using pressure or heat and pressure. This method itself is a well-known technique and various materials can be used, but the following can be illustrated. As a peelable gas, a polyester film with a silicon film was used, and as a reduced pressure or thermal pressure ink, a vehicle in which acrylic resin was dissolved in a solvent such as butylcarbitol acetate was kneaded together with glass and a dielectric powder containing glass ( I) can be used. The powder particle diameter is preferably 0.1 to 5 탆. This ink is, for example, screen-printed on a peelable gas to form an insulating layer and dried. A porous metal plate is placed on this film, and both are pressurized by normal temperature or heating, the insulating layer is brought into close contact with the surface pattern of the porous metal plate, and the substrate can be transferred by peeling off the substrate.

This transfer can be performed on one side or both sides of the perforated metal plate. By heating in the transferred state and melting the glass, the insulating layer is fixed to the porous metal plate. If this fixing is carried out in contact with the glass substrate of the panel, it is convenient that the partition wall to the glass substrate can be achieved at the same time.

The advantages of the transfer method described above are large for high-precision panels, especially for small partition widths. If the insulating layer is formed on the side surface of the partition as in the first method, for example, even if the insulating layer is thin, the discharge cell area is reduced. When the insulating layer is formed only on the surface of the perforated metal plate, when a method other than the transfer method is used, for example, screen printing, it is difficult to print a high-definition pattern, or it is easy to cause dimensional deviation, or printing. Even if it is, there is a problem such that ink spreads on the side surface of the partition wall due to the flow of ink. The degree of difficulty can be understood when a high-precision panel having a partition width of 100 µm or less and a cell pitch of 200 µm or less is assumed.

In addition, when the metal serving as the partition wall is exposed in the discharge chamber as in the second method, there is a possibility that a problem on the discharge electrode may occur. However, as is well known, the voltage drop in the DC PDP is only very near to the negative. Therefore, the inventors have experimentally found that the discharge panel is sufficiently operated even if only a conductive portion is insulated in the vicinity of the discharge electrode. Experiments have shown that the distance between the electrode and the barrier metal is only a few μm, and even if the safety is about 10 μm, there is no problem. Therefore, it is effective to apply an insulation layer thickness that can realize such a distance.

Thus, the thickness of the insulating layer (dielectric layer) formed in a perforated metal plate is 1-100 micrometers.

On the other hand, considering a panel in which two glass plates are provided with a porous metal plate having a parallel surface constituting a completely closed bulkhead, it is considered that there is a problem in encapsulating discharge gas or exhausting the gas before it. In particular, it is a problem when the upper and lower sand scans of each discharge cell adhere to the closed glass gas in a hermetic manner such as fusion of glass. At this time, it is necessary to fix in the apparatus filled with the encapsulated glass, and the research on the apparatus is necessary. However, if each cell has a gap communicating with the exhaust hole, a conventional apparatus can be applied. As experimentally reported by the present inventors, it has been found that there is no problem in gas encapsulation if the gap, that is, between the porous metal plate and the panel glass, has a groove for gas diffusion of about 10 μm even if several μm of safety is estimated.

Such a gap is inevitably formed by irregularities caused by the electrode shape formed on the panel glass, the film shape of the insulating layer formed on the panel or the porous metal plate, and irregularities caused by the pattern. In addition, in order to form a groove | channel for gas diffusion surely, you may select from the following method and may combine. The first is to increase the electrode film thickness using, for example, a thick film technique. The second is to adopt a stripe dielectric as an insulating layer between the electrode and the porous metal plate to have a predetermined thickness. The third is to form grooves on the surface of the perforated metal plate. It is preferable to use the etching method described in the processing of the hole pattern for forming the groove, and according to this, the hole pattern processing and the simultaneous batch processing are also possible.

As in the second method described above, a stripe dielectric was used. Fig. 11 shows the structural components and the assembly diagram of the DC-type PDP and the structure cross-sectional view of one cell of the PDP is shown in Fig. 12, respectively. The code numbers in FIGS. 11 to 12 are the same as in FIG. However, a dielectric layer is deposited on the lattice-shaped partition wall 4 made of a porous metal as in FIG. 7 to form an insulating layer. 10 denotes a stripe dielectric, and 11 denotes a phosphor.

The dielectric material used for such an insulating layer can use at least 1 type or more selected from organic substance, a crystalline inorganic substance, and glass. In detail, in general, glass or a crystalline inorganic substance containing glass is generally used.

Specific examples of the glass composition include PbO-B ₂ O ₃ -SiO ₂ , PBo-B ₂ O ₃ , ZnO-B ₂ O ₃ -SiO _2, and the like. As for the flash point of these glasses, the particle size of 350-1000 degreeC glass has about 1-5 micrometers, respectively. The glass used here is heated up to a temperature (sealing temperature) at which the sealing glass frit softens and melts in the sealing step of the PDP, and should not be remelted at ionicity. Usually, the sealing temperature of glass frit is about 50 degreeC higher than a softening point. The sealing temperature of PDP is preferably about 400 to 450 占 폚, and therefore, the chloride point of the glass contained in the dielectric material is preferably 350 占 폚 or higher.

In addition, when the upper limit of the swallowing point is considered to be formed on the surface of the perforated metal plate, it is determined under the condition that the metal does not deform and that the metal and the dielectric do not cause a large amount of chemical reaction, and the temperature is preferably 1000 ° C or lower.

As the crystalline inorganic substance, ceramics such as alumina (Al ₂ O ₃ ) and forsterite (2MgO-SiO ₂ ) may be used, and inorganic pigments (FeO-Cr ₂ O ₃ , CoO-Al ₂ O _3, etc.) may be used. Do. As a particle size of this crystalline inorganic substance, about 1-5 micrometers is preferable.

Moreover, any organic substance can be used as long as it can be finally inorganicized.

In a general panel encapsulation method (sealed by encapsulating glass), the encapsulation temperature is to be endured, and the coefficient of linear thermal expansion should be approximately equal to that of two glass plates, encapsulating glass, and partition walls. In view of this, the above materials are suitably selected.

In addition, since the perforated metal tube is conductive, it can be used as an electrode. Since this electrode is electrically connected between a plurality of cells, it is not advantageous to use the display cell as a selection electrode. However, it has been proposed to employ auxiliary discharge in DC type PDPs. (Japanese Patent Application Laid-Open No. 54-115060, Japanese Patent Application Laid-Open No. 58-30038, and the Korean Journal of Television Science, Vol. 40, No. 10, p.953 1986) Since these auxiliary discharges are effective also to generate all the cells simultaneously, the above-mentioned porous metal plate can be used as this auxiliary discharge electrode.

Thus, the constituent members and the assembly of the PDP using the porous metal plate as the auxiliary discharge electrode are shown in FIG. 13, and the cell cross-sectional view along the anode direction is shown in FIG. The code numbers in FIGS. 13 to 14 are the same as in FIG. However, a dielectric layer is deposited on the lattice-shaped partition wall 4 made of a porous metal similarly to Fig. 7 to form an insulating layer. 12 denotes a third electrode group (cathode), 15 denotes a second electrode group (anode), and 14 denotes a first electrode (trigger electrode).

At this time, if necessary as the auxiliary discharge space, it is also possible to use a plurality of perforated metal plates as shown in Figs. For example, if two perforated metal plates with roughly the same perforation pattern are superimposed on one sheet and one sheet is an auxiliary discharge electrode, and the other sheet is a partition wall forming a discharge space, the auxiliary discharge electrode does not interfere with display. Can be formed. If insulation between the plurality of porous metal plates is required, the same method as that of the formation of the insulation layer described above can be performed. As is well known, the auxiliary discharge electrode can be used even when the metal is exposed or coated on the dielectric layer. Moreover, the position etc. are suitably designed according to the electrode structure and shape structure of a panel. The use of a plurality of the above-described porous metal plates increases the design freedom of the inter-electrode distance in the counter electrode, and in the design of the same barrier height, a thin metal plate can be used, so that a finer cell pitch can be formed in one sheet. In the same cell pitch, a smaller partition width and thus a larger aperture ratio can be formed.

This is because the porous metal plate is a metal, for example, even if it is thin, the operation is easy and possible. This advantage is also valid in the following cases.

That is, in the color PDP, ultraviolet rays are generally generated by discharge, and the fluorescent material is excited by the ultraviolet rays. Usually, this phosphor is deposited on the front glass plate or the back glass plate. The luminescence intensity is larger as the area of the adhered phosphor is larger. Therefore, it is preferable to deposit phosphor on the side of the partition wall, that is, inside the hole of the perforated metal plate. Similar designs have been proposed for partition walls formed of conventional dielectrics (close to: experiments 2 and 3 of the discharge display element and its melting, the Korean Society of Television and Television Engineers Display 13-1 (mar… 1975)) Publication 51-38996). However, in the porous plate using glass, it is difficult to handle a large display area with a cell pitch of 0.6 mm or less. In addition, multicolor phosphors are divided on the side walls of the barrier ribs formed by, for example, thick film printing. Painting requires a high level of skill. Since the perforated metal sheet of the present invention can be easily handled alone and can form a highly accurate perforated pattern, the following method can be carried out.

In general, since the phosphor is a main body, the thick film ink can be adjusted. The ink is used to print a phosphor in the perforated portion, but the ink does not reach the depth of the hole or closes the hole even when it reaches. Therefore, when ink is sucked from the opposite side of the printing surface of the hole, a phosphor having a thickness corresponding to the viscosity of the ink is applied to the inner surface of the hole, and excess ink is discharged out of the hole. According to this method, it is possible to separate and paint multicolor phosphors on the inner surface of the hole of the metal hole plate having a cell pitch of 0.3 mm or less. Since the partition wall of the present invention can be completely closed, the phosphor deposition area is larger than that of the incomplete closed partition wall.

In forming the cell partition wall used in the PDP, the present invention uses a partition wall made of a perforated metal plate different from a conventional partition wall of a dielectric (glass or glass-containing inorganic material). Therefore, the shape of the cell shape, the size and the arrangement pitch is large due to the processing precision of the metal thin plate, and the dot size and the dot pitch obtained by the AC type and the DC type PDP which perform normal dot matrix display can be sufficiently satisfied. Has precision. In addition, by forming the insulating layer, the electrode on the front plate or the back plate and the porous metal plate can be electrically insulated.

As described above, the PDP of the present invention, in which a porous metal plate is used for a partition wall and an insulating layer is formed, can cope with high-precision cell pitch and is excellent in crosstalk characteristics. In addition, there is no electrical short circuit between the anode and the cathode.

Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1

As the metal material composition of the perforated metal plate serving as the partition wall, 42 wt% Ni-6 wt% Cr-Fe alloy having a coefficient of thermal expansion 92 × 10 ⁻⁷ / ° C. was used. The metal plate thickness is 0.1mm, and the arrangement of the drilled holes is made in the form of lattice in parallel with the vertical and horizontal pitches. The pitch is 0.2mm and the size of the drilled holes is 0.15 × 0.15mm. To form a porous metal plate.

As shown in Fig. 6, the PDP is formed with a transparent conductive film (ITO) as an anode on the front glass plate and Ni as a cathode on the rear glass plate. In addition, a stripe-like dielectric layer was formed by screen printing on the electrodes of the front glass plate and the back glass plate to avoid the display cell region, thereby forming an insulating layer.

Next, a porous metal plate (bulk wall) was sandwiched between the front plate and the back plate, and the circumference was sealed with a sealing glass to form an X-Y matrix DC-type PDP.

Comparative Example 1

The partition wall of the DC type PDP shown in Example 1 was formed by thick film printing.

First, a partition wall having a dot pitch of 1.0 mm and a hole size of 0.8 x 0.8 mm was prepared. Eight times of overlapping printing, the height of the bulkhead was formed to 0.15mm.

Next, an attempt was made to create a partition having a dot pitch of 0.2 mm and a hole size of 0.15 x 0.15 mm with the same precision as that shown in Example 1. FIG. At 1.0 mm pitch, the almost negligible misalignment of the alignment or the bleeding of the printing paste could not be ignored, and the production was technically difficult, and the yield was much worse than that in Example 1. In addition, a satisfactory cell opening rate could not be obtained for the reason described above. In the example, the hole size drilled for a 0.2 mm pitch was 0.1 × 0.1 mm and the aperture ratio was 25%. In Example 1 described above, the drilled hole size was 0.15 × 0.15 mm and the aperture ratio was 56%.

Comparative Example 2

The partition wall of DC type PDP shown in Example 1 was created by the etching process of the photosensitive plate glass. However, this material is extremely expensive in terms of price as described above, and is very fragile because of thin glass, and is far from Example 1 in terms of granulation workability.

Comparative Example 3

The punched-out process was performed to general soda-lime glass etc., and the partition of DC type PDP similar to the comparative example 2 was created. In this method, however, the dimensional accuracy is considerably lowered in comparison with Comparative Example 2 in performing a plurality of high-precision fine punching processes of about 0.2 mm. Moreover, in view of the fragility of the thin glass, it was lower than Comparative Example 2 in terms of workability and granulation workability, and thus was considerably separated from Example 1.

[Comparative Example 4]

Without forming an insulating layer on the front glass plate and the back glass plate, the perforated metal plate was used alone as a partition wall. As a result, an electrical short circuit occurs between the anode and the cathode, and thus, there is an inconvenience that the non-selected cell emits light because it is not viscous or in some cases, only the anodes or only the cathodes are short-circuited. Disappeared.

Example 2

Using the lattice-shaped porous metal sheet used in Example 1, a dielectric was deposited thereon to obtain an insulating layer.

As the dielectric material, an inorganic filler such as a softening point of 600 ℃, average particle diameter _{2~3μm ZnO-B 2 O 3 -SiO} 2 based glass powder, and Al ₂ O _3, FeO and Cr ₂ O ₃ was used. The deposition of the dielectric was carried out using a lattice-shaped perforated metal plate as a cathode in an electrodeposition liquid, and a metal plate having the same material and the same area as the anode as an anode. The operating voltage was set at a DC 200 volt constant. As a result, the electrodeposition state and the electrodeposition layer strength were extremely good.

The sample was adjusted to a temperature higher than the softening point of the glass powder at 600 ° C. in the air, and the dielectric layer was made into a dense film to obtain a desired lattice-shaped porous metal layer having the surface deposited with the dielectric.

Next, a DC-type PDP using a lattice-shaped perforated metal plate on which this surface was deposited with a dielectric was used as a partition wall, as shown below.

That is, as shown in FIG. 7 to FIG. 10, as the partition 4, a grating-shaped perforated metal plate whose surface is covered with a dielectric material, and glass 8 thicker than the partition 4 as the spacer 8 were used. The partition 3 and the spacer 8 are sandwiched between two front glass plates 1 and a rear glass plate 5 on which electrodes are formed in advance, and the periphery is sealed with a sealing glass 9 to form a DC of XY matrix. PDP was formed.

The sealing situation of this DC-type PDP was favorable, and there was no problem such as breakage due to stress distortion. At this time, the spacer is located outside the display area of the PDP, and there is always a gas introduction space of about 30 μm in the display area with partition walls, and the exhaust and gas encapsulation in the pipe are reliably performed over the entire display area.

Example 3

A DC-type PDP using a lattice-shaped perforated metal plate and a stripe-like dielectric having a surface deposited with a dielectric as a dielectric was used as the partition wall as shown below.

That is, as the stripe dielectric, a dielectric layer having a film thickness of 30 µm, a pitch of 0.2 mm, and a forming line width of 50 µm was formed on the back glass plate using a photo insulator (manufactured by Tokyo-Ogagokyo Co., Ltd.).

Next, as shown in FIGS. 11 to 12, the lattice-shaped perforated metal plate 4 and the stripe-shaped dielectric 10 having the dielectric deposited thereon are sandwiched between the front glass plate 1 and the rear glass plate 5. Using this as a partition wall, sealing with a low melting glass frit, vacuum exhausting and gas sealing through a tip tube, sealing the tip tube, and created DC type PDP. In this DC type PDP, as shown in Figs. 11 to 12, the anode 6 is formed on the front glass plate 1, and the phosphor 11 is dotted on the inner surface of the front glass plate 1. On the other hand, the negative electrode 7 is formed in the back glass plate 5. The anode 6 and the cathode 7 cross each other at right angles to form a dot matrix. In this manner, a DC-type PDP having a number of formed dots of 100 × 100 was obtained. In addition, the encapsulated gas was He-Xe (2%) 300 Torr.

The DC-type PDP thus obtained was excellent in all of adaptability, workability, uniformity of discharge voltage characteristics, and crosstalk characteristics for high precision.

Example 4

The DC type PDP using the lattice-shaped perforated metal plate deposited on the surface used in Example 2 as a dielectric for partition walls was created as shown below. That is, as shown in FIGS. 13 to 14, the thin film Al is formed in a stripe shape with a line width of 0.1 mm as 0.2 mm pitch as the first electrode 14, and ZnO-B ₂ O ₃ is formed thereon as the dielectric layer 2 thereon. A small amount of Al ₂ O ₃ powder was kneaded with a vehicle to paste into a -SiO ₂ -based glass powder, betained by screen printing, and calcined at 580 ° C. Next, Ni paste was used as the second electrode 13 in the direction perpendicular to the first electrode 14 on the dielectric layer, and was formed in a stripe shape with a line width of 0.1 mm by 0.2 mm pitch by screen printing. And it baked at 580 degreeC. In addition, a phosphor was coated on the second electrode 13 at the intersection of the first electrode 14 and the second electrode 12.

As the porous metal plate electrode serving as the third electrode 12, a metal plate having the same material and the same shape as the base metal of the partition wall 4 serving as the porous metal plate was used. In addition, the partition 4 is formed of two perforated metal plates.

Next, a partition wall 4 made of a porous metal plate obtained as described above is placed on the rear glass plate 5 and sandwiched by a front glass plate 1 on which the third electrode 12 is disposed, and sealed with a low melting glass frit. After passing through the tip tube and vacuum evacuation and gas sealing, the tip tube was sealed to prepare a DC-type PDP. In addition, 350-rr of Ne-Ar (0.5%) was used as the encapsulation gas.

The DC-type PDP thus obtained was excellent in all of the sputter resistance of the cathode, the current density of the cathode, the discharge holding voltage, and the workability (mass production).

Example 5

As the porous metal plate serving as the partition wall, 42 wt% Ni-6 wt% Cr-Fe alloy having a coefficient of thermal expansion of 92 × 10 ⁻⁷ / ° C. was used. The plate thickness is 75μm, and the arrangement of the holes is square in the form of lattice in parallel with the vertical and horizontal pitches.The pitch is 0.2mm and the size of the holes is 0.17 × 0.17mm. It formed, and it was set as the porous metal plate (A type). In addition, as the same perforated metal sheet, a plate pressure of 75 µm, a cell pitch of 0.15 mm, and a hole size of 0.12 x 0.12 mm (type B) were used for two types.

As the dielectric material, ZnO-B ₂ O ₃ O ₂ -based glass powder having a softening point of 800 ° C. and an average particle diameter of _{2 to 3} μm, and inorganic fillers such as Al ₂ O ₃ , Fe ₂ O ₃ and Cr ₂ O ₃ were used. The acrylic resin having hot compressibility was dissolved in an organic solvent such as BCA (butyl carbitol acetate) or fine oil to form a transfer printing vehicle. This vehicle consists of 50-80 weight part of resin powders, and 20-50 weight part of solvent powders. Next, with respect to 5 to 20 parts by weight of the vehicle, 80 to 95 parts by weight of the glass powder and the inorganic filler were kneaded to obtain a transfer printing paste. This paste is beta-printed by the screen printing method on the polyester film of a peeling gas, and is fully dried at 90 degreeC. The dry transfer sheet was pressed onto the perforated metal plate by a hot roller or a hot equilibrium press. After pressing, the transfer sheet was peeled off, and the porous metal plate on which the dielectric layer was formed was fired at 600 to 680 ° C. in the air, and the dielectric layer was completely made of an inorganic and dense film to obtain an insulating layer on the surface of the porous metal plate.

Next, DC type PDP using this porous metal plate as a partition was created as shown below. That is, as shown in FIG. 6, a porous metal plate is used as the partition 4, and this partition 4 is used between the two front glass plates 1 and the rear glass plate 5 in which electrodes are formed in advance. The circumference | surroundings were sealed by sealing glass, and it formed in DC type PDP of XY matrix.

The sealing situation of this DC-type PDP was favorable, and there was no problem such as breakage due to stress distortion.

Such a DC-type PDP was able to obtain satisfactory results without dropping the aperture ratio in either of the A type and B type with different cell pitches.

Claims (11)

The front glass plate 1, the back plate 5 and the partition 4 having a thickness of 0.01 to 1.0 mm are integrally sealed, and the partition 4 is made of a metal sheet having a plurality of holes for discharge cells. And the plurality of holes for the discharge cells are formed at positions where the first parallel electrode group 6 and the second parallel electrode group 7 cross each other at predetermined intervals in the vertical plane of the plasma display. At least one of the upper and lower surfaces of (4) is covered with an insulating layer 2 composed of at least one selected from glass or an inorganic dielectric material containing glass, and the minimum pitch of the plurality of hole arrangements for the discharge cells is 0.4 mm or less, the number-average porosity in the hole display area is 35% or more excluding the frame portion, and the plurality of holes for the discharge cells are filled with ionizable gas. Display panel. The plasma display panel according to claim 1, wherein the partition wall (4) is made of an alloy sheet containing at least one metal selected from the group consisting of iron, nickel, chromium and cobalt. The plasma display panel according to claim 1, wherein the glass used for the insulating layer (2) has a softening point of 350 to 1000 占 폚. The plasma display panel according to claim 1, wherein the entire surface of the partition wall (4) is covered with the insulating layer (2) having a thickness of 2 to 40 µm. A plasma display panel according to claim 1, wherein said partition (4) is used as a discharge electrode independently of said two parallel electrode groups (6, 7). The plasma display panel according to claim 1, wherein a plurality of metal sheets having a plurality of holes for the discharge cells are stacked at the same positions of the holes. The plasma display panel of claim 1, wherein phosphors are deposited on inner surfaces of the plurality of holes for the discharge cells. A plurality of holes having a thickness of 0.01 to 1 mm and arranged in a matrix for forming discharge spaces in the thickness direction are formed, the minimum pitch of the array of these holes is 0.4 mm or less, and the number average aperture ratio of the portion where the holes are arranged is At least 35% of the metal sheet excluding the frame portion, wherein at least one of the upper surface, the lower surface, or the entire surface including the inner surface of the metal sheet excluding the frame portion is at least one selected from glass or an inorganic dielectric material containing glass A partition wall, characterized by being covered with a dielectric of. 9. The barrier rib according to claim 8, wherein phosphors which emit visible light by ultraviolet rays generated by gas discharge are deposited on the inner surface of the barrier rib (4). The partition wall 4 has a thickness of 0.01 to 1 mm, a minimum pitch of an array of a plurality of holes arranged in a matrix used in forming a discharge space in the thickness direction of 0.4 mm or less, and an opening ratio of a portion where the plurality of holes are formed is 35%. As described above, the dividing powder is formed into a partition wall 4 in a liquid in which at least one dielectric powder selected from glass or an inorganic dielectric containing glass is suspended using the partition 4 as an electrode for electrodeposition. Electrode is deposited on the entire surface except at least the terminal connecting portion, and is heated to melt and fix the glass, and the line-shaped first electrode group 6 parallel to at least one of the front glass plate 1 and the back plate 5 and The second electrode group 7 is formed, and the front glass plate 1 and the back plate 5 correspond to the holes of the partition wall 4 at positions where the electrode groups 6 and 7 replace each other. On the front glass plate (1) and the back plate (5) Insert the partition walls 4, after the airtight sealing glass around a method for producing a chemical conversion ion plasma display panel characterized in that the charge to seal the gas. 11. The method of claim 10, wherein the dielectric powder is kneaded together with a liquid vehicle containing an organic resin, and the kneaded product is formed on a peelable gas, and then the metal sheet for the partition wall 4 is overlaid, and heated or pressurized by room temperature. After adhesion, the method of manufacturing a plasma display panel is formed by transferring a dielectric film onto the surface of the metal sheet while removing the peelable gas, and then heating to scatter the liquid vehicle and adhering the dielectric layer to one or both surfaces of the metal sheet. .