JPH0419942A - Plasma display panel using holed metal plate as partition and manufacture thereof - Google Patents

Abstract

PURPOSE:To deal with the high definition of a plasma display panel by using a holed metal plate as a partition or spacer, and also providing insulating layers between the holed metal plate and electrodes. CONSTITUTION:A front glass plate 1 is provided with a cathode 6, and a back glass plate 5 is provided with an anode 7, and a lattice partition 4 of a holed metal is disposed, and insulating layers 2 are disposed between the glass plates 1, 5 and the partition 4 respectively. The holed metal plate 4 has a composition of Ni, a Cr-Fe alloy, an Ni-Fe alloy in a weight ratio of 42:6:50 and its plate thickness is selected in the range of 0.01 to 1.0mm. The coefficient of linear expansion of the metal plate is preferably 80 to 100(X10<-7> deg.C). The hole pattern of the metal plate 4 is preferably provided by corrosion method. PbO-B2O3-SiO2 glass or Al2O3 containing glass and the like is used in forming each insulating layer 2. Each insulating layer is formed on the electrode through printing except on cell holes. A plasma display panel thus formed is capable of dealing with fine cell pitches and is excellent at crosstalk characteristic and the short circuit between anode and cathode would not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plasma display panel using a perforated metal plate as a partition or a spacer, and a method for manufacturing the same.

[Prior Art] In general, in a plasma display panel (hereinafter referred to as FDP) in which a plurality of discharge cells are arranged, regardless of the discharge type such as AC or DC, it is necessary to ensure an appropriate discharge gap or to prevent the discharge from adjacent cells. Requires bulkheads or spacers to prevent crosstalk.

By the way, the arrangement of the FDP discharge cells is determined depending on the purpose of use. For example, 7 segment figure 8 surface water, 5×
There are 7 dot character display, 840 x 480 dot full dot display, etc.

1 to 5 show examples of discharge cell arrangement of these FDPs. In FIGS. 1 to 5, 1 is a front glass plate, 3 is a partition wall, 5 is a back glass plate, 6 is an anode, and 7 is a cathode. As shown in these figures, partition walls and spacers (hereinafter referred to collectively as partition walls in some cases) having cell holes of various shapes and arrangements are used. The partition walls can be made using the same method for any cell arrangement, and various methods have been tried up to now, including the following methods.

Method A: Thick film method (multilayer printing using screen printing) Method B: Etching of photosensitive plate glass Method C: Drilling of plate glass [Problem to be solved by the invention] Of these, method A is inexpensive and has excellent mass productivity. However, this method
There is a drawback that a sufficient discharge gap cannot be obtained unless printing is repeated many times. In addition, especially full dot display F
In DP, high-definition dot pitch (for example, dot pitch 0.2ai) is an important issue, but this is difficult to handle with screen printing.

There is an example of a stripe shape as shown in Fig. 2 being realized (Y, Amano: SID Int Sy
mp, Dig.

Tech, Paper, p. 160 (1982))
It is particularly difficult to deal with barrier ribs that completely surround the discharge cell as shown in FIGS. 1 and 4, and requires very advanced technology, which is impractical.

As mentioned above, when there is a partition wall that completely surrounds a discharge cell (hereinafter referred to as a completely closed partition wall) and a part where there is no partition wall between the adjacent cell even in one direction, as in the case of a stripe shape (hereinafter referred to as a completely closed partition wall), , incompletely closed septum), there is a big difference in the following sense.

For example, an FD that emits orange light due to neon gas discharge.
When using the emission color of the rare gas itself, such as P, the emission is limited only to the vicinity of the electrode of the selected cell, so it has been put into practical use even with incompletely closed partition walls, but multi-color or full-color PDPs In this case, since a method is used in which the phosphors are excited to emit light by the ultraviolet rays accompanying the discharge, the ultraviolet rays may leak through incompletely closed partitions, causing the phosphors in adjacent cells to be excited and emit light.

That is, crosstalk or color bleeding is unavoidable, which impairs color reproducibility and resolution, resulting in a decrease in value as a display. In this respect, method A is unsuitable for producing high-definition completely closed partition walls and is not practical for color FDP.

Method B is considered to be relatively easy to adapt to higher definition, but it is expensive and less economical because it uses extremely special photosensitive glass as a material. Further, it is practically difficult to assemble thin glass plates having a thickness of 0.1 to 0.5M because the glass is brittle.

Regarding method C, although general glass can be used, it is difficult to drill holes with a high-definition cell pitch, and assembly is similarly difficult.

Therefore, until now, no barrier ribs or spacers have been found that are compatible with the high definition of FDP, can secure an appropriate discharge space, are relatively inexpensive, and are excellent in mass production.

The present invention has been made in view of the problems of the prior art, and provides an FDP using a perforated metal plate as a partition wall or spacer, which is compatible with high definition, economical and mass-producible, and a method for manufacturing the same. The purpose is to provide

[Means for Solving the Problems] The above objects of the present invention are achieved by using a perforated metal plate as a partition or a spacer and providing an insulating layer between the perforated metal plate and the electrode.

That is, the PDP of the present invention has a thickness of 0.01 to 1. It is characterized by using a perforated metal plate of Om as a partition wall or a spacer, and further having an insulating layer for electrically insulating the perforated metal plate from the electrodes on the front plate and the back plate.

The present invention will be explained in more detail below.

In the present invention, the metal material composition of the perforated metal plate serving as the partition wall or spacer is 42% by weight Ni, 6% by weight Cr-
Examples include Fe alloy, 50% by weight Ni-Fe alloy, and the like.

The thickness of these metal plates is 0.01 to 1.0 m, preferably 0.05 to 0.0 m. Im's can be used.

Incidentally, the partition wall or spacer is sandwiched between two glass plates, and the periphery thereof is sealed with sealing glass to seal gas inside. Therefore, the linear thermal expansion coefficients of the partition wall (spacer), the two glass plates, and the sealing glass are approximately the same or 1J.
Must be similar. Otherwise, excessive stress will be applied to the glass during the cooling process after sealing, leading to breakage.

Generally, the two glass plates are made of soda lime glass, so the linear thermal expansion coefficient of the metal plate is 80.
~100 (X 10-'/''C) is desirable. Therefore, as mentioned above, the metal material composition is 4
2 wt% Ni-6 wt% Cr-Fe alloy, 50 wt% N
i-Fe alloy etc. are preferred. Of course, if a glass member having a linear thermal expansion coefficient different from the above is used, the material for the partition wall may be selected accordingly.

As a method for forming a predetermined perforation pattern on the metal plate, a punching method using a press, a laser processing method, a plating method, a welding method, an etching method, etc. can be used. The most advantageous processing method should be used in consideration of processing distortion, processing accuracy, processing cost, etc. Generally, the etching method is preferably used.

The shape and arrangement of the holes in the perforated metal plate can be arbitrary, such as the lattice shape, stripe shape, circular shape, etc. shown in FIGS. 1 to 5.
Examples include a delta arrangement and a 7-segment format, but in the present invention, a shape that provides a high-definition, completely closed partition wall as shown in FIGS. 1 and 4 is preferred, and a lattice shape as shown in FIG. 1 is particularly preferred.

In the present invention, a perforated metal plate processed into the desired shape in this way is used as a partition wall, and at this time, discharge electrodes are arranged on the front plate and the back plate, and A
It is fine if the electrodes are covered with a dielectric material like in a C-type FDP, but if the electrodes are exposed to the discharge space like in a DC-type FDP, they should be placed between the front plate and the back plate. If the perforated metal plate (partition wall) is sandwiched and sealed, each electrode and the perforated metal plate (partition wall) will be electrically short-circuited.

That is, the anodes of the FDP, the cathodes, and the anodes and cathodes are electrically short-circuited, resulting in a state in which discharge and light emission cannot occur. Therefore, in the present invention, the above problems can be solved by providing an insulating layer between the perforated metal plate (partition wall) and the discharge electrode.

This insulating layer may be formed on the electrodes of the front plate and the back plate, or on the surface of the perforated metal plate (partition wall) in contact with the electrodes, or on both. Also good.

Further, as the dielectric material used for the insulating layer, at least one material selected from organic materials, crystalline inorganic materials, and glass can be used. More specifically, glass or a crystalline inorganic material containing glass is generally used.

To give an example of a specific glass composition, pbo-B203
-5t02, Pb0-B203, Zn
OB203-8t 02 etc. are suitable. The softening point of these glasses is 350-1000℃, and the particle size of the glass is 1
About 5 μml is preferable. The glass used here is heated in the PDP sealing process to a temperature at which the sealing glass frit softens and melts (sealing temperature), and must not be remelted at this temperature.

Usually, the sealing temperature of glass frit is 50℃ above the softening point.
To a high degree. In addition, the sealing temperature of FDP is 400~
Approximately 450°C is suitable, and therefore, it is desirable that the softening point of the glass contained in the dielectric material be 350°C or higher.

In addition, the upper limit of the softening point is determined on the condition that the metal is not deformed and the metal and dielectric do not cause a chemical reaction, assuming that it is formed on the surface of a perforated metal plate, and the temperature is 10
It is desirable that the temperature is below 00°C.

Ceramics such as alumina (AJ203) and forsterite (2Mg 0-8t 02 ) are used as crystalline inorganic materials, and inorganic pigments (Fe 0-C
r203, Co0-AJ203, etc.) can also be used. The particle size of this crystalline inorganic material is preferably about 1 to 5 μm.

Furthermore, any organic substance can be used as long as it can be finally turned into an inorganic substance.

In a typical panel sealing method (sealing with sealing glass), the panel must withstand the sealing temperature and have approximately the same coefficient of linear thermal expansion as the two glass plates, the sealing glass, and the partition wall. From this point of view, the above materials are appropriately selected.

Furthermore, as a method for forming an insulating layer for electrically insulating a perforated metal plate (partition wall) and a discharge electrode in the present invention, at least one of the following methods can be used.

That is, (1) a dielectric layer is formed by screen printing on each of the electrodes of the front plate and the back plate at a position that avoids the cell holes in the partition wall and electrically insulates the electrodes and the perforated metal plate. do.

(2) Photosensitive glass paste is printed all over, exposed to light, and developed to form the same dielectric material as in (1) above on the electrodes of the front plate and back plate in the same manner as in (1) above.

(3) A dielectric layer is formed on both the front and back sides of the partition wall by screen printing at a position where the electrode and the perforated metal plate are electrically insulated.

(4) Using a photosensitive glass paste on both the front and back sides of the partition, a dielectric is formed in the same position as in 3) above in the same manner as in (2) above.

Among these methods, the most advantageous method can be selected and used by considering accuracy cost, etc., but (1) or (
Method 2) is preferably used.

FIG. 6 shows the constituent parts and an assembling diagram of a DC-FDP which is an example of the present invention.

In the figure, a front glass plate 1 is provided with a cathode 6, and a rear glass plate 5 is provided with an anode 7, respectively. Furthermore, a grid-like partition wall 4 made of perforated metal is arranged between the front glass plate 1 and the back glass plate 5, and an insulating layer 2 is further provided to electrically insulate the cathode 6 and anode 7 from the grid-like partition wall 4. It is located between the front glass plate 1, the rear glass plate 5, and the lattice-shaped partition wall 4.

[Function] In forming cell partition walls used in plasma display panels, the present invention uses partition walls made of a perforated metal plate, which is different from the dielectric (glass or inorganic material containing glass, etc.) partition walls conventionally used. It is used. Therefore, the cell shape, size, arrangement pitch, etc. largely depend on the processing accuracy of the thin metal plate, and the cell shape, size, and arrangement pitch depend largely on the processing accuracy of the thin metal plate.
It has sufficient accuracy to form the dot size and dot pitch required by P. Further, by providing an insulating layer, it is possible to electrically insulate the electrodes on the front plate and the back plate from the perforated metal.

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

Example 1 A 42% Ni-6% Cr-Fe alloy having a linear thermal expansion coefficient of 92 (x lo-', /''C) was used as the metal material composition of the perforated metal plate serving as the partition wall. The metal plate thickness is 0.1#, and the holes are arranged in a lattice shape with a large number of squares arranged vertically and horizontally, with a pitch of 0.281.
111. The hole size is 0.15X O, 15m,
A large number of holes were formed through etching to create a perforated metal plate.

The front glass plate of the FDP is coated with a transparent conductive film (I) as an anode.
TO), and Ni4 is provided on the rear glass plate as a cathode. Furthermore, a striped dielectric layer was formed by screen printing on the electrodes of the front glass plate and the back glass plate, avoiding the display cell area, to serve as an insulating layer.

Next, a perforated metal plate (partition wall) was sandwiched between the front plate and the back plate, and the periphery was sealed with sealing glass to form an XY matrix DC-FDP.

Comparative Example 1 The partition walls of the DC-PDP shown in Example 1 were formed by thick film printing.

First, dot pitch 1.0. , hole size 0.8X
A partition wall of 0.8- was created. The height of the partition wall was formed to 0.15 m by overprinting 8 times.

Next, an attempt was made to create a partition wall with the same accuracy as that shown in Example 1, with a tod pitch of 0.2# and a hole size of 0.15 x 0.15 mm. With a pitch of 1.0 mm, slight misalignment or dripping of the printing paste can be ignored, and manufacturing is technically difficult.
The yield rate was much worse than in Example 1. Furthermore, even for those that were successfully manufactured, a sufficient cell aperture ratio could not be obtained for the reasons mentioned above. To give an example, the hole size is 0.2M pitch. IX
The aperture ratio was 25% at O.11NR. In Example 1 described above, the hole size was 0.15×O, 15 m, and the aperture ratio was 56%, so Example 1 was clearly advantageous.

Comparative Example 2 The partition walls of the DC-PDP shown in Example 1 were created by etching a photosensitive plate glass. However, as mentioned above, this material was extremely expensive, and since it was a thin plate glass, it was very brittle, and was inferior to Example 1 in terms of assembly workability.

Comparative Example 3 A C-FDP partition wall was created by drilling holes in general soda-lime glass, etc., as in Comparative Example 2. However, this method required drilling a large number of holes at a high-definition pitch of approximately 0.2 m+. In this case, the dimensional accuracy is considerably lower than that of Comparative Example 2. In addition, considering the brittleness of the thin glass, the workability and assembling workability were inferior to Comparative Example 2, so Example 1
It was considerably inferior.

Comparative Example 4 A perforated metal plate was used alone as a partition without providing an insulating layer on the front glass plate and the back glass plate. As a result, an electrical short circuit occurs between the anode and the cathode, and the light does not light up.In some cases, only the anodes or the cathodes are shorted, causing unselected cells to emit light. It didn't make any sense.

[Effects of the Invention] As described above, the FDP of the present invention in which a perforated metal plate is used as a partition wall and an insulating layer is provided can support a high-definition cell pitch and has excellent crosstalk characteristics. Also,
No electrical short circuit occurs between the anode and the cathode.

[Brief explanation of drawings]

FIG. 1 is an example of a PDP using grid-shaped partition walls in an X-Y matrix arrangement. FIG. 2 is an example of a PDP using stripe-shaped partition walls in an X-Y matrix arrangement. An example of an FDP using circular partition walls in a Y-matrix arrangement, Fig. 4 is an example of an FDP using partition walls in a delta arrangement, Fig. 5 is an example of an FDP using partition walls in a 7-segment format, and Fig. 6 is , components of D+ and -FDP according to the present invention and a diagram showing the assembly process. 1. Front (glass) plate; 2. Insulating layer, 3, partition (dielectric), 4. Partition wall (perforated metal plate), 5, back (glass) plate, 6. Anode, 7. Cathode. Patent applicant Noritake Co., Ltd.

Claims (1)

[Claims] 1. A perforated metal plate with a thickness of 0.01 to 1.0 mm is used as a partition wall or a spacer, and the electrodes on the front and rear plates are electrically insulated from the perforated metal plate. A plasma display panel characterized in that it has an insulating layer. 2. The linear thermal expansion coefficient of the perforated metal plate is 80 to 100 (×
10^-^7/°C). The plasma display panel according to claim 1. 3. The plasma display panel according to claim 1 or 2, wherein the insulating layer uses a dielectric material containing glass having a softening point in the range of 350 to 1000°C. 4. The method of manufacturing a plasma display panel according to claim 1, 2 or 3, wherein the insulating layer is formed by screen printing.