JPH05266803A - Plasma display panel - Google Patents

Abstract

PURPOSE:To manufacture a plasma display panel having a high-precision large screen and reduce the production cost by forming resistance circuits on a dielectric substance coated on the surface of partition plates with a porous metal plate. CONSTITUTION:Multiple discharge display cells are formed with a porous metal plate at positions where a linear first electrode group (row) and a linear second electrode group (column) intersect. Resistance circuits are formed on a dielectric substance coated on partitions 8. A back plate 2 is a dielectric layer baked and coated with glass paste to prevent the short circuit between the partition plate metals and the circuits. Phosphors 7 with various colors are coated on the inner faces of cell holes, and anodes 4 are filled in back side hole sections. Anode bus lines and resistors 5 are fitted and baked. Window glass is used for a front glass plate 1 and a back plate 2, and cathodes 3 are formed on the inside of the glass plate 1. A plasma display panel having a high-precision large screen can be easily machined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly to a plasma display panel having a resistance circuit.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter referred to as P
(Abbreviated as DP), many types are known. For example, an alternating current type (AC type) and a direct current type (DC type) are known. In addition, each one sees the emission color of the discharge gas,
There is one (color PDP) which makes a phosphor emit visible light by ultraviolet rays generated by electric discharge.

In order to make the PDP thin, it is often adopted that a front glass plate and a rear plate are opposed to each other and the periphery is sealed with a seal glass to form an airtight container for containing a discharge gas.
Normally, low-priced soda-lime glass for windows is used for both the front and back plates.

Color PD having a large number of fine display cells
In P, in order to prevent erroneous discharge between adjacent cells and color bleeding,
Alternatively, a partition wall is formed between the front and back plates as a spacer for supporting the pressure difference between the inside and outside of the PDP and defining the distance between the discharge electrodes. A thick film technique of printing and firing a dielectric paste such as glass on a front glass plate or a back plate is used for forming the partition walls. In addition, JP-A-3-15
No. 2830, JP-A-3-205738, JP-A-4-199442 and the like also disclose a method using a perforated metal plate.

In a PDP having a large number of fine display cells capable of displaying images, a rectangular cell array is usually adopted. The reason for this is to facilitate the formation of electrodes and the like.
In many cells, it is convenient to divide the discharge electrodes into rows and columns and to form them at the intersections of line-shaped row and column electrodes, respectively.

In the PDP, there are many components such as electrodes, wirings, dielectric layers, partition walls, phosphors and the like. Since it is difficult to form these on one substrate, it is common to divide these into a plurality of substrates. The dielectric layer is useful as an AC-type electrode coating, light shielding, an insulating layer for coloring and multilayer wiring for improving contrast, and the like.

Many PDP circuits use resistors. For example, a bias resistor for using one power source for a plurality of potentials, a current limiting resistor for defining a discharge current, and the like.

The current limiting resistor stabilizes the glow discharge used by the PDP and is useful as a DC type for preventing transition to arc discharge. Usually, one or more of these resistors are required for one electrode wire. Attaching a current limiting resistor to each discharge cell is convenient for giving a memory effect to the DC type PDP. This memory function is useful for obtaining high brightness, and is particularly effective for color PDPs that currently have low luminous efficiency.

The resistors may be formed separately outside the PDP, but are preferably formed integrally with the PDP. This is because many resistors can be collectively formed on the PDP substrate and the whole can be made compact.

A soda-lime glass plate for windows is widely used as a substrate for forming constituent elements including the resistance of PDP, and its heat resistance is about 600.degree. In addition, a simple thick film technique is often used as a forming technique. In the thick film process, it is usually 5 because of the resin scattering of the used ink and the development of adhesion.
A firing temperature of 00 ° C. or higher is used.

The glass substrate is deformed depending on the firing temperature, holding time and the like. The thermal expansion properties of these materials are also examined because of the influence of the deposited materials. Deformation of the substrate is also affected by the thermal history of the substrate glass. That is, deformation occurs even at a temperature below the strain point of glass.

When the amount of thermal deformation of the soda-lime glass substrate for windows was actually measured, it contracted 0.05% at 540 ° C. and 0.2% at 580 ° C. This amount of deformation varied depending on the firing conditions and the number of firings. Generally, a low melting point glass used for a thick film material requiring adhesive strength has a working temperature of 540 ° C. in a component system having desirable characteristics for PDP.
It is difficult to be less than. Generally the most used temperatures are 540-600 ° C. Therefore, the glass substrate is considerably deformed, and the front and rear plates of the PDP are inevitably complicatedly deformed during PDP manufacturing.

At this time, the following problems occur.
In a PDP capable of displaying images, a large number of display cells are used, and the cell patterns of the front and back plates must match. The guideline of the length that the displacement of the two substrates is allowed in the design is up to the partition wall width, which is double this even if the center is aligned. In order not to reduce the size of the display portion, the partition wall width is preferably 1/3 or less of the cell. When the partition wall width is ⅓ of the cell length and 1000 cells are arranged at equal pitches, the allowable deformation rate in this direction is ± 0.067%. Therefore, the allowable deformation rate of a PDP with a high definition and a large screen is very small,
The amount of deformation of the base glass may exceed this. P
Depending on the DP manufacturing process, the amount of deformation of the glass substrate may be expected to some extent, and at this time, the pattern can be corrected in advance. However, this correction is complicated, and the amount that can be assumed is a part of the amount of deformation and cannot be completely corrected.

Of course, it is possible to use a glass plate having high heat resistance to reduce the amount of deformation. However, the cost of the circuit board is increased, and the expansion of the circuit board is generally small, so that the material for forming the circuit is limited and sometimes the circuit board cannot be used.

On the other hand, in the thin film technology, it is possible to form a pattern even at 500 ° C. or lower. The problem of deformation due to heat can be reduced. However, the thin film technology requires expensive equipment, has a problem in mass productivity, and raises the cost, so that the range of use should be reduced as much as possible.

As can be seen from the above description, in the prior art, when a cell pattern is formed on a glass substrate by using a heating process at 500 ° C. or higher, it is necessary to make an effort to correct the substrate deformation, or a PDP with a high definition and large screen is formed. In some cases, alignment may not be possible. Further, in the case of the fine cell shape, it is complicated if the number of times of aligning the individual parts is large.

[0017]

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems of the prior art, and to provide a PDP which is easy and inexpensive to manufacture, has resistance, and can be made fine and large. ..

[0018]

The above object of the present invention is achieved by forming a resistance circuit on a dielectric material deposited on the surface of a partition plate formed of a perforated metal plate.

That is, according to the present invention, in the PDP in which a plurality of discharge display cells are formed at the position where the line-shaped first electrode group and the line-shaped second electrode group intersect, a partition wall formed of a perforated metal plate. A PDP is characterized in that a resistance circuit is formed on a dielectric material deposited on the surface of a plate.

The present invention will be described in more detail below.
For the PDP of the present invention, the technique of a conventionally known PDP can be applied, except that the circuit including the resistor is formed on the covering dielectric of the partition plate formed of the perforated metal plate. For example, various construction methods, forming materials, forming techniques, and the like.

Since the partition wall is in close contact with the front and rear plates, it is necessary to select a metal having a coefficient of thermal expansion similar to that of the substrate. If the substrate is soft glass, 42 wt% Ni-6 wt% Cr-
Fe alloy and 50 wt% Ni-Fe alloy are hard glass, 20 wt% Ni-17 wt% Co-Fe alloy and 42
A suitable example is a wt% Ni-Fe alloy. further,
The above-exemplified metals have excellent heat resistance and thermal oxidation resistance, and the dimensional change due to heating up to 700 ° C. in air is a small amount within the measurement error range. Further, like ordinary metals, these metals have good workability, and when a metal plate having a thickness of 0.1 mm is processed by etching, display cells having a pitch of 0.15 mm or less can be formed. Also, since the mechanical properties are good,
Even thin ones of 1 mm or less have good operability.

A method for forming a PDP circuit on the coating dielectric of this partition plate is also disclosed in Japanese Patent Application No. 3-3 proposed by the present inventors.
It is described in detail in No. 48574. Therefore, it is a preferable method to form the resistance and the resistance terminal, the wiring connected to the resistance and the at least one group of electrodes, and the like on the partition plate. P
In the case of DP, a film resistance is convenient for formation. Commercially available RuO ₂ and LaB ₆ based resistive inks for thick film technology are most easily available. Other methods, such as thin film technology, are also applicable.

One bias resistor is usually required for each scanning line. Therefore, these can be formed outside the screen. That is, if the partition plate is expanded to other than the screen, resistance can be easily formed.

Even if the current limiting resistor is line-sequentially driven, one signal line may be provided for each signal line. However, a current limiting resistor for driving a memory is required for each cell, and when forming wirings, electrodes, resistors and terminals, very fine processing is required if the partition wall width is small. Therefore,
It is preferable to devise the following.

That is, the cell hole shape formed by the partition wall is
It is to be large on the front side and small on the back side. It is advantageous that the front side is large for display, but the back side may be small. Therefore, it is preferable to form the resistors and the like on the back surface having the large area. This is advantageous for forming electrodes and wirings of each cell even in the case of bias resistance or the like.

Such processing of the partition wall can be easily achieved even from a single metal plate by changing the patterns on the front and back sides during etching. A PDP having a complicated structure can be freely designed by using a plurality of partition plates. Of course, if there is a margin in the partition wall width, resistance can be formed on both sides of the partition wall.

[0027]

EXAMPLES The present invention will now be described in more detail by way of examples. It should be noted that publicly known techniques were used for steps other than those described below.

EXAMPLE This example shows the most complicated type of forming a limiting resistance in each cell. That is, memory drive is possible and D
An example of the C type color PDP is a reflection type. Figure 1
This is a schematic partial plan view of the PDP as seen from the back side.
A sectional view of the portion is shown in FIG. 1-2, common reference numerals indicate the same components.

In FIG. 1, the front glass plate 1, the back plate 2, the cathode 3 and the phosphor 7 are omitted. The cell array is a square with a pitch of 0.4 mm, and the length is 960 and the width is 1280.
It was made up of individual pieces.

The partition wall 8 has a thickness of 0.15 mm and is 42 wt%.
Ni-6wt% Cr-Fe alloy plate is etched,
_{SiO 2 -B 2 O 3 -PbO-} Al 2 O 3 it as electrode
-ZnO glass powder was electrodeposited and then fused at 650 [deg.] C. to cover almost the entire surface with a dense dielectric. The dielectric thickness is about 10 μm. The cell hole shape of the partition wall is 28 on the front side.
It is almost square with 0 μm and 130 μm on the back side. At this time, the thickness of the hole portion on the back surface side was about 50 μm. A glass paste containing an Al ₂ O ₃ filler was applied to the back side so that the thickness after firing was about 20 μm. this is,
Each circuit on the partition plate and the partition plate metal is a dielectric layer that surely prevents a short circuit, and is not shown in FIGS. The phosphor 7 of each color is applied to the inner surface of the cell hole, and
The u anode 4 was filled. After this, the Ag anode bus line 6
And RuO ₂ resistor 5 were deposited and fired at 580 ° C.
The thickness of the anode is about 40 μm, and the others are about 10 μm.
The line width of the anode bus line and the resistance is about 80 μm. Thick film technology was applied except for electrodeposition.

At this time, the deformation of the partition plate due to each heating step is
The error range was small. Therefore, the alignment of each process was easy. Soda-lime glass for windows was used as the front glass plate 1 and the back plate 2. Inside the front glass plate, an Al film having a thickness of about 1 μm was formed by sputtering, and a cathode 3 having a line width of 150 μm was formed by etching. This cathode line is formed in a ladder shape with a width of 30 μm, the pitch of the ladder steps is 200 μm, one is located in the center of the cell, and the other is located on a high partition wall. By doing so, the emission of the phosphor can be sufficiently transmitted from the cathode ray portion.

The process temperature of the thin film technology used for forming the cathode was 200 ° C. or lower, and there was no thermal deformation. The front glass plate and the partition plate were aligned so that the cathode line was at a predetermined position in the center of the partition plate cell, and the periphery of the screen was sealed with a seal glass together with the back plate to form a PDP. Since the front plate and the partition plate were accurately formed, alignment was easy. The temperature of the seal was 470 ° C., and there was no thermal deformation due to this, and therefore there was no displacement. PD
After evacuation of P, 350 Torr of He—Xe (5%) gas was enclosed. After aging, normal lighting was confirmed.

As can be seen from the above description, P of the present invention
Obviously, various types of DP can be applied. Further, it is of course possible to form the current limiting resistance and the bias resistance for the sequential driving which are simpler than those in this embodiment.

[0034]

EFFECTS OF THE INVENTION Since the constituent elements including the resistance circuit are formed on the partition wall formed of the perforated metal, the present invention has the following effects. Since the partition walls have high heat resistance and good dimensional stability, there is no need for dimensional correction in forming each constituent element, and PDP assembly can be performed accurately. Since the cell components are formed on the partition, the partition and the front,
The number of alignments with the back plate can be reduced. Since the heat resistance of the partition wall is high, the material selection range is wide and a component having high characteristics can be formed. In addition, inexpensive thick film technology can be applied. In a design in which electrodes, resistors, etc. are formed on one substrate, and the electrodes, resistors, etc. are formed on the back surface of the partition that faces them, if the partition is extended and external terminals are integrally formed, all external terminals will be on the same surface. Since it can be oriented, the assembling of the circuit is facilitated.

Therefore, according to the present invention, a high-definition, large-sized PDP having resistance can be easily formed at low cost.

[Brief description of drawings]

FIG. 1 is a partial schematic plan view illustrating a PDP structure.

FIG. 2 is a schematic cross-sectional view taken along the line AA ′ in FIG.

[Explanation of symbols]

1: Front glass plate, 2: Back plate, 3: Cathode, 4:
Anode, 5: resistance, 6: anode bus line, 7: phosphor, 8: partition wall.

Front page continuation (72) Hideyuki Asai Hideyuki Asai 5 Nakazaike, Nagakute-cho, Aichi-gun, Aichi Prefecture (72) Inventor Naoya Kikuchi Miyoshi-cho, Nishikamo-gun, Aichi 300 Yoshiyama Higashiyama (72) Inventor Nakano Ryuji No.30 Miyata, Toda, Toda-cho, Nakagawa-ku, Nagoya-shi, Aichi

Claims (1)

[Claims] 1. In a plasma display panel in which a plurality of discharge display cells are formed at positions where a line-shaped first electrode group and a line-shaped second electrode group intersect, a partition plate surface formed from a perforated metal plate. A plasma display panel, wherein a resistance circuit is formed on a dielectric material deposited on the plasma display panel.