JPH05174715A - Color plasma display panel - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of a color plasma display panel even if it is a collar PDP of a high heat resistance and a highly precise large screen by forming the bulkhead of a DC type color plasma display panel out of metal having a hole. CONSTITUTION:Ni 15mum thick is overlaid as a cathode 4 on a front glass board 1, and an anode 3 of Ag 8mum thick is overlaid on a bulkhead 6. For the bulkhead 6, the hole on the rear surface is made small by changing the etching patterns on the display face and the rear face. The hole on the rear surface is approximately 130mum wide and 200mum long, and the thickness is approximately 60mum, and an anode is overlaid on the inner face of this small hole by dipping Ag ink, and an phosphor 7 is overlaid on the inner face of the partition wall. A sub cathode 4' is formed on the rear plate 2 similarly to the cathode, and hereon a printed glass sub partition wall 6' approximately 150mum wide and approximately 110mum high is formed. Hereby, the heat resistance of the partition wall and the sub partition wall is high, and the dimensional change is small, and mechanical property is favorable, so even if it is a collar PDP of a highly precise screen, it can be manufactured easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color plasma display panel, and more particularly to a direct current type color plasma display panel.

[0002]

2. Description of the Related Art There are various methods for constructing a direct current type color plasma display panel (hereinafter abbreviated as color PDP). However, in order to make it thin, the front glass plate and the rear plate facing each other are covered with a seal glass. It is often adopted to form an airtight container that is sealed to contain the discharge gas. Usually, low cost soda lime glass 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, as a spacer for supporting the pressure difference between the inside and outside of the panel and for defining the distance between the discharge electrodes, a partition is formed between the front and back plates, and the space surrounded by the partition and the front and back plates. Becomes one display cell. A fluorescent substance is deposited on the inner surface of the display cell, and the fluorescent substance emits visible light of each color by ultraviolet rays generated by discharge. 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. Further, JP-A-3-152830, JP-A-3-205738, and Japanese Patent Application No. 2-120048 disclose methods using a perforated metal plate.

It is known that the time required for the discharge to occur is delayed with respect to the applied voltage, and the value is μsec.
Widely varies from ~ msec. It is considered that this is related to the amount of ions existing in the discharge space. When the discharge delay time is long and the variation thereof is wide as described above, a large number of display cells are provided, so that normal driving becomes difficult in a color PDP that requires high speed driving. It is also effective to increase the applied voltage to reduce the discharge delay, but this is not a good idea because it increases the load on the drive circuit. Therefore, in a color PDP having many display cells, it is general to use auxiliary discharge.

For this auxiliary discharge, two types, (1) one that uses an auxiliary discharge space different from the display cell and (2) one that uses the storage capacity, have been adopted.

Of these, the method (2) requires a dielectric area corresponding to the required charge amount, which is usually formed on the same surface as the cathode. Therefore, it becomes difficult to secure the area when the display cell becomes small, and it is difficult to form and drive the cell with a pitch of 0.25 mm or less.

In (1), there are one in which the auxiliary discharge space is formed on the same surface as the display cell and the other in which the auxiliary discharge space is formed on the back surface of the display cell. The former is difficult to miniaturize for the same reason as (2),
It is even more disadvantageous to provide a partition between the display cell and the display cell to prevent leakage light emission. The latter does not have the above disadvantages. As an example of this, a bellows type is conventionally known, and a partial cross-sectional perspective view is shown in FIG. Note that the reference numerals in the following figures are common, and the same reference numerals indicate the same things.

In the figure, an anode 3 is formed on the inner surface of the front glass plate 1 as a thin wire or as a transparent conductive film, and a part of the anode is exposed and a phosphor (not shown) is applied thereto. It On the back plate 2, the wire of the auxiliary anode 3'is installed on the bottom of the groove 5 formed into a slit shape. On the back plate,
A striped metal thin plate is placed as the cathode 4 in a direction intersecting with the anode and the auxiliary anode, and a perforated glass plate which is the partition wall 6 is placed on the front glass plate and the back plate in a state of being sandwiched therebetween. Get burned. A small hole is formed in the cathode at a position connecting the upper display cell and the lower groove.

FIG. 2 is a partial sectional view showing another structure.
In the figure, 61 to 66 are glass plates each having a small hole, 61 to 63 form an auxiliary discharge space, and 64 to 66 form a display space. Further, 7 is a phosphor.

As can be seen from FIGS. 1 and 2, the conventional structure for forming the auxiliary discharge space on the back surface of the display cell is complicated and its formation is complicated. That is, in FIG. 1, it is necessary to form and assemble many perforated glass plates, etc. in FIG. 1, and perforated glass plates for partition walls, striped metal cathode plate having small holes, auxiliary anode wires, groove processing of the back plate, etc. It becomes complicated.

In a color PDP in which one pixel requires display cells of three or more colors, and therefore the number of display cells is large and a fine cell pitch is preferable, it is burdensome to take the above complicated steps, and the accuracy can be maintained. It will be difficult. The perforated glass plate needs to have a thickness of about 0.1 to 0.2 mm and its mechanical strength is small, so that the operability is poor, and it is difficult to maintain accuracy because it is deformed in various thermal processes for forming the PDP. As described above, various improvements are desired in the related art under the present circumstances.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of these problems of the prior art. The auxiliary discharge portion is provided on the back surface of the display cell, and the structure is simple and the manufacture is easy even with a high-definition large screen. The present invention aims to provide a color PDP that is stable.

[0013]

[Means for solving the problems]. The present inventors have arrived at the present invention as a result of intensive studies to solve the above-mentioned problems of the prior art.

That is, the color PDP of the present invention constitutes an airtight container for sealing the discharge gas by sealing the front glass plate and the back plate facing each other with the seal glass, and the two substrates and the partition between them. In a direct current color PDP in which a plurality of display cells surrounded by and are formed, a phosphor is applied to the inner surface of the display cells, and an auxiliary discharge space different from the display cells is formed by auxiliary barrier ribs on the back surface of the display cell. ,
The partition wall is formed of a perforated metal plate.

The present invention will be described in more detail below.
As the front glass plate used in the present invention, soda lime glass for windows is preferable because of its low cost. Other components such as transparent glass can also be used, but in addition to cost, there are many heat-bonding steps, and therefore, it may be selected in consideration of thermal expansion compatibility with other materials and heat resistance.

The back plate is also selected in consideration of heat resistance, thermal expansion, cost, etc., but it is convenient to use the same as the front glass plate.

Next, the partition wall and the auxiliary partition wall, which are the features of the present invention, will be described. The partition forming the display cell is formed of a perforated metal plate. Alternatively, the auxiliary partition wall forming the auxiliary discharge space is also preferably formed using a perforated metal plate, and this perforated metal plate may be the same as or different from that used for the partition wall. This is already known as described above. Since the partition wall or the auxiliary partition wall is in close contact with the front and back 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-6w
In the case of hard glass, t% Cr-Fe alloy or 50wt% Ni-Fe alloy is 20wt% Ni-17wt% Co-Fe.
Suitable examples include alloys and 42 wt% Ni-Fe alloys. Furthermore, the metals exemplified above are excellent in heat resistance and heat 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. It is possible to form finer or more complicated cells by using a plurality of metal plates, but the cost is higher than that of forming one cell. Even with a single metal plate, by using the above etching process, a mask pattern on the front and rear surfaces can be changed to easily obtain a partition wall or an auxiliary partition wall having different upper and lower hole shapes. In addition, since the mechanical properties are good, even thin ones of 0.1 mm or less have good operability.

In the present invention, it is preferable to form a plurality of discharge electrodes and their wiring circuits on the barrier ribs or the auxiliary barrier ribs made of a perforated metal plate, because the alignment work becomes less. It is desirable that at least a part of the partition wall or the auxiliary partition wall is covered with an inorganic dielectric material in order to prevent these from short-circuiting and to prevent a short circuit of the plurality of electrodes formed on the substrate and its wiring circuit. Alternatively, it is desirable that almost the entire surface of the auxiliary barrier rib is covered with a dielectric. The method of coating the dielectric is described in detail in the above-mentioned patent application and Japanese Patent Application No. 2-270610, and it does not short-circuit with an electric circuit formed thereon, and thus contains a glass that easily forms a dense layer. It is preferable to use an inorganic material. Since the heat resistance of the partition wall or the auxiliary partition wall is higher than that of a general glass material, the material selection range is wide and an electrode having excellent characteristics and a wiring circuit thereof can be formed. In addition, inexpensive thick film technology can be applied. Of course, if an electric circuit is not formed on the partition wall or the auxiliary partition wall, and an insulating layer is provided on the electric circuit at a position in contact with the partition wall made of a perforated metal plate or the auxiliary partition wall,
No dielectric coating of the barrier ribs or auxiliary barrier ribs is required.

[0019]

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.

Preparation of Panel In each of the following examples, soda lime glass for windows was used as the front and back plates. The pixel configuration is shown in the plan view of FIG. 3, and FIGS. 4 to 6 below show cross-sectional views of part A thereof. The cell pitch in the horizontal direction is 0.2 mm, the partition wall width is about 70 μm, and the vertical pitch is 0.6 mm, and the partition wall width is about 150 μm. The partition wall has a thickness of 0.15 mm and is 42 wt% Ni-6 wt% Cr.
-Fe alloy plate is etched and S is used as an electrode.
_{iO 2 -B 2 O 3 -PbO-} Al 2 O 3 after electrodepositing -ZnO based glass powder, thereby forming coating substantially the entire surface with a dense dielectric are fused at 650 ° C.. The dielectric thickness is about 10 μm.
When forming the auxiliary partition wall from a metal plate, the same procedure as that of the partition wall was performed except for the shape and size. After this, the auxiliary partition in place,
Electrodes, wirings, insulating layers, phosphors, etc. were formed, the front and back plates and partition walls were assembled at predetermined positions, and the periphery was sealed with sealing glass to form a panel. The thick film technology is applied to the formation of each circuit and the like, which is not described, and the thickness of the phosphor is 500.
C. and others were fired at 560 to 580.degree. After the panel was evacuated, 350 Torr of He—Xe (2%) gas was enclosed. After aging, normal lighting was confirmed.

Example 1 A schematic sectional view of this panel structure is shown in FIG. As the cathode 4, Ni having a thickness of 15 μm was deposited on the front glass plate 1, and the anode 3 was deposited on the partition wall 6 with Ag having a thickness of 8 μm. For the partition walls, the etching patterns on the display surface and the back surface were changed to reduce the holes on the back surface. The holes on the back side are approximately 130 μm wide and 200 μm long,
The thickness was about 60 μm. The inside of this small hole is covered with an anode by dripping Ag ink. The phosphor 7 was applied to the inner surface of the partition hole. An auxiliary cathode 4'is formed on the back plate 2 like the cathode, and a width of about 150 μm and a height of about 11 are formed on the auxiliary cathode 4 '.
A 0 μm printed glass auxiliary partition wall 6 ′ was formed. The number of parts for forming the display cell was 3, and the number of times of alignment was 2.

Example 2 In the same panel structure as in Example 1, the cathode 4 and the partition wall 6 are used.
The schematic cross-sectional view formed above is shown in FIG. The cathode shape is a ladder shape in which two straight lines with a width of about 50 μm at the upper and lower ends of the display cell are connected by a straight line with a width of about 70 μm on the vertical partition.
Each was formed with a little sag inside the partition holes. The number of parts for forming the display cell was 3, but the number of times of alignment was once.

Example 3 A schematic sectional view of this panel structure is shown in FIG. On the front glass plate 1, an indium-tin oxide film having a thickness of 0.5 μm was formed as the anode 3 by sputtering, a part of the anode was exposed, and the phosphor 7 was applied. The hole shape of the partition wall 6 is the same on the front and back surfaces. The Ni cathode 4 was formed on the auxiliary partition wall (plate) 6 '. The hole shape of the auxiliary partition wall is about 130 μm in diameter on the display surface side.
It has a circular shape with a width of about 150 μm and a depth of about 110 on the back side.
The stripe shape was μm. The inside of the small hole of the auxiliary partition is N
i The ink is dripped and deposited. A on the back plate 2
g auxiliary anode 3'is formed. Formation of Ni and Ag is the same as that of the first embodiment. The number of parts for forming the display cell was 4, and the number of times of alignment was 3.

As can be seen from the above embodiments, various types can be applied to the color PDP of the present invention.

[0025]

As is apparent from the above description, according to the present invention, the number of parts can be reduced as compared with the prior art, so that parts can be easily formed and assembled. Since the partition walls and the auxiliary partition walls have high heat resistance, small dimensional change, and good mechanical properties, even a high-definition large-screen color PDP can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view illustrating a structure of a bellows type panel.

FIG. 2 is a partial cross-sectional view illustrating another conventional panel structure.

FIG. 3 is a partial plan view showing a pixel configuration used in an example.

FIG. 4 is a partial schematic cross-sectional view illustrating the panel structure according to the first embodiment.

FIG. 5 is a partial schematic sectional view illustrating a panel structure according to a second embodiment.

FIG. 6 is a partial schematic sectional view illustrating a panel structure according to a third embodiment.

[Explanation of symbols]

1: front glass plate, 2: back plate, 3: anode,
3 ': auxiliary anode, 4: cathode, 4': auxiliary cathode, 5:
Grooves, 6, 61 to 66: partition walls, 6 ': auxiliary partition walls, 7:
Phosphor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideyuki Asai 5th Nakaike, Nagakute-cho, Aichi-gun, Aichi-gun, Nagaike 5 (72) Inventor Naoya Kikuchi, Miyoshi-cho, Nishikamo-gun, Aichi 300 Higashiyama, Higashiyama (72) Inventor Ryuji Nakano No. 30 Miyata, Toda, Oita, Tomita-cho, Nakagawa-ku, Nagoya, Aichi Prefecture

Claims (4)

[Claims] 1. An airtight container for accommodating a discharge gas is formed by sealing a front glass plate and a rear plate which face each other with a seal glass, and is surrounded by the two substrates and partition walls sandwiched between the two substrates. In a direct current color plasma display panel in which a plurality of display cells are formed, a phosphor is deposited on the inner surface thereof, and an auxiliary discharge space different from the display cells is formed on the back surface of the display cell by an auxiliary partition, the partition is provided. A color plasma display panel characterized by being formed of a perforated metal plate. 2. The method according to claim 1, wherein at least a part of the surface of the perforated metal plate forming the partition wall is covered with an inorganic dielectric, and the discharge electrode and its wiring circuit are formed on the dielectric. Color plasma display panel. 3. The color plasma display panel according to claim 1, wherein the auxiliary barrier rib is formed of a perforated metal plate which is the same as or different from the barrier rib. 4. The method according to claim 3, wherein at least a part of the surface of the perforated metal plate forming the auxiliary barrier rib is covered with an inorganic dielectric, and the discharge electrode and its wiring circuit are formed on the dielectric. The described color plasma display panel.