JP2007173249A - Method of manufacturing plasma display panel, and plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent phosphor and reflection body from adhering on an upper face of barrier ribs when forming the phosphor and the reflection body. <P>SOLUTION: A water repellent film 110 made of water repellent material is arranged on upper face of barrier ribs. The water repellent film 110 can be formed by painting fluororesin, for example, polytetrafluoroethylene on upper face of the barrier ribs 17. Concretely, the water repellent film 110 made of fluororesin can be formed on the barrier ribs 17 by applying melted fluororesin by a spin coat method after forming a film 84 of barrier rib material on the upper face of the barrier rib 17, before removing a mask of a dry film 81, at a process of forming the barrier ribs by a thermal spray method. Thus, by reducing phosphor ink absorbing property at upper face of the barrier ribs 17, adhesion of the phosphor ink on the upper face of the barrier ribs can be prevented when painting the phosphor ink. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a plasma display panel used for a display device, and more particularly to a manufacturing method suitable for a plasma display panel having a detailed cell structure.

In recent years, expectations for high-definition and large-screen televisions such as high-definition television are increasing, and display fields such as CRT, liquid crystal display (LCD), and plasma display panel (hereinafter referred to as PDP). The development of a display suitable for this is underway.
CRTs that have been widely used as television displays have been excellent in terms of resolution and image quality, but are not suitable for large screens of 40 inches or more in that the depth and weight increase with the size of the screen. is there. LCDs have excellent performance such as low power consumption and low driving voltage, but there are technical difficulties in producing a large screen, and the viewing angle is limited.

On the other hand, the PDP can realize a large screen with a small depth, and a 40-inch class product has already been developed.
In general, a PDP has a front cover plate having electrodes on its surface and a back plate arranged in parallel with the electrodes facing each other, and a gap between the plates is partitioned by a partition wall. The structure is such that red, green, and blue phosphor layers are formed in the grooves and the discharge gas is sealed, and the manufacturing is performed by forming the phosphor layers in the grooves of the back plate on which the barrier ribs are disposed, and This is done by stacking the front cover plate and enclosing the discharge gas. And it drives by applying to an electrode with a drive circuit.

The light emission principle of a PDP is basically the same as that of a fluorescent lamp. When a driving circuit is applied to an electrode and discharged, ultraviolet rays are emitted from the discharge gas, and phosphor particles (red, green, blue) in the phosphor layer are emitted. Excitation light is emitted in response to the ultraviolet rays, but it is difficult to obtain high brightness like a fluorescent lamp because the efficiency of converting discharge energy into ultraviolet rays and the efficiency of conversion to visible light in the phosphor are low.
PDPs are roughly classified into a direct current type (DC type) and an alternating current type (AC type) depending on the driving method. In the DC type, the electrode is exposed to the discharge space, whereas in the AC type, a dielectric glass layer is disposed on the electrode.

In addition, the shape of the partition is also different. In general, the partition wall is arranged in a stripe pattern in the AC type, whereas the partition wall is arranged in a cross pattern in the DC type. In this respect, the AC type is suitable for forming a panel having a fine cell structure.
By the way, as the demand for high-quality displays increases, a PDP having a fine cell structure is desired.

For example, in the conventional NTSC, the number of cells is 640 × 480, and in the 40 inch class, the cell pitch is 0.43 mm × 1.29 mm, and the cell area is about 0.55 mm ^2. Then, the number of pixels is 1920 × 1125, the cell pitch in the 42 inch class is 0.15 mm × 0.48 mm, and the area of one cell is 0.072 mm ² .

In order to put the PDP having such a detailed cell structure into practical use, it is necessary to increase the light emission efficiency of the cell as compared with the prior art. For this reason, researches such as improvement of the phosphor have been made.
JP-A-6-273925 JP-A-53-79371 JP-A-8-162019

Under such a background, there are the following problems regarding the formation of the phosphor layer.
As a method of forming the phosphor layer, as shown in FIG. 25, a method of filling the phosphor paste in the recesses between the barrier ribs by a screen printing method and firing is often used. On the other hand, the screen printing method is difficult to apply.
That is, when the cell pitch is about 0.1 to 0.15 mm, the groove width between the partition walls is as narrow as about 0.08 to 0.1 mm, but the phosphor ink used in screen printing has a high viscosity. (Normally, several tens of thousands of centipoise), it is difficult to pour phosphor ink between narrow partitions with high accuracy and at high speed. It is also difficult to produce a screen plate with a fine structure.

  In addition, in order to obtain a PDP with high luminous efficiency, it is desirable that the phosphor layer is disposed not only on the surface of the back plate but also on the side surfaces of the barrier ribs and a discharge space is secured. Can do. If a phosphor layer having such a desirable shape is to be formed by screen printing, an appropriate amount of phosphor paste is applied to the surface of the plate and the side walls of the barrier ribs by adjusting the printing conditions such as the viscosity of the phosphor paste. Although it is necessary to make it adhere, it is difficult to adjust to suitable printing conditions, and there is a problem that the phosphor paste hardly adheres to the side face of the partition wall in practice.

As a method for forming a phosphor layer other than the screen printing method, a photoresist film method and an ink jet method are also known.
In the photoresist film method, as disclosed in JP-A-6-273925, an ultraviolet photosensitive resin film containing each color phosphor is embedded between the partition walls, and the phosphor layer of the corresponding color is formed. In this method, only the part to be formed is exposed and developed, and the part that is not exposed is washed away. According to this method, even when the cell pitch is small, the film can be embedded between the partition walls with a certain degree of accuracy. However, for each of the three colors, it is necessary to sequentially perform film embedding, exposure development, and washing off, which causes a problem that the manufacturing process is complicated and color mixing is likely to occur, and phosphors are relatively expensive. Nevertheless, it is difficult to recover the washed-out phosphor, which increases the cost.

  On the other hand, in the ink jet method, as disclosed in JP-A-53-79371 and JP-A-8-162019, scanning is performed while an ink liquid composed of a phosphor and an organic binder is pressurized and ejected from a nozzle. In this way, the ink liquid is deposited on the insulating substrate in a desired pattern, and the ink can be accurately applied to the recesses between the narrow partition walls.

However, in such a conventional ink jet method, the ejected ink is intermittently adhered as droplets. Therefore, when the partition walls are arranged in stripes, a certain film thickness is formed in the grooves between the partition walls. It is difficult to apply with. Further, as in the screen printing method, there is a problem that the ink liquid concentrates on the bottom surface of the concave portion and hardly adheres to the side surface.
By the way, in such a PDP, there is also known a technique for improving panel luminance by first forming a reflective layer in the recesses between the partition walls and forming a phosphor layer on the reflective layer (for example, Japanese Patent Laid-Open No. Hei. No. 4-332430).

As a method for forming the reflective layer, a method for forming the reflective layer by applying a paste containing a reflective material by a screen printing method is known as in the case of the phosphor layer. There is a problem that the reflector paste is difficult to apply to a detailed cell structure and is difficult to adhere to the side surface of the partition wall.
Further, regarding the formation of the phosphor layer and the reflection layer, there is a problem that the phosphor and the reflector material are likely to adhere to the upper surface of the partition wall. In this case, when the back plate and the front cover plate are sealed, the adhesion between the upper part of the partition wall and the front cover plate tends to be impaired.

  In addition, the PDP has a problem related to electrode formation. That is, in the conventional PDP, the display electrode and the address electrode have a width of about 130 μm to 150 μm and are usually formed by screen printing. However, as described above, in the case of the pixel level of a high-definition television, the electrode width It is necessary to set the electrode width to about 70 μm, and in the case of 20-inch SXGA (pixel number: 1280 × 1024) with high definition, it is necessary to make the electrode width around 50 μm. It is.

In view of the above problems, it is a first object of the present invention to provide a method for producing a PDP that can easily form a phosphor layer and a reflective layer even on the side surface of a partition wall.
Another object of the present invention is to prevent the phosphor or reflector from adhering to the upper surface of the partition wall when forming the phosphor layer or the reflective layer.

In order to achieve the first object, the present invention provides a method for producing a plate in which recesses are formed between partition walls, and the side surface of the recesses has a higher adsorption power to phosphor ink or reflector ink than the bottom surface. It was decided to form.
The second object is to form a plate in which a recess is formed between the partition walls so that the adsorbing power to the phosphor ink or the reflector ink is greater on the side surface than on the upper surface of the partition wall. Can be achieved.

  As described above, according to the present invention, in the step of forming the phosphor layer or the reflection layer in the groove between the partition walls in the plate in which the partition walls are arranged in stripes, the phosphor ink or the reflection material ink is discharged from the nozzle. Phosphor ink or reflector ink is applied by scanning the nozzle along the partition wall while discharging in a continuous flow, so that the phosphor can be easily and accurately even in the case of a fine cell structure. When the barrier ribs are striped, the phosphor layer and the reflective layer can be uniformly formed in the groove between the barrier ribs.

Here, if the nozzle is scanned along the partition wall while jetting the phosphor ink with the nozzle facing the side surface of the partition wall, the phosphor layer and the reflection layer can be easily formed also on the side surface of the partition wall. You can also
Further, in the step of forming the phosphor layer, after the phosphor ink is applied to the groove between the partition walls, an external force is applied to the applied phosphor ink to adhere to the side surfaces of the partition walls. In contrast, the phosphor layer can be easily formed.

  In addition, the phosphor layer can be easily and accurately even in the case of a fine cell structure by scanning the nozzle along the partition wall while keeping the groove between the partition walls and the nozzle cross-linked by the surface tension of the phosphor ink. When the barrier ribs are striped, the phosphor layer and the reflective layer can be uniformly formed in the groove between the barrier ribs, and also on the side walls of the barrier ribs. A phosphor layer and a reflective layer can also be easily formed.

Further, in the step of creating a plate in which recesses are formed between the partition walls, the side surfaces of the recesses are formed on the side surfaces of the partition walls so that the side surface is more adsorbed with respect to the phosphor ink or the reflector ink. On the other hand, a phosphor layer and a reflective layer can be easily formed.
Further, in the step of creating the plate in which the recesses are formed between the barrier ribs, the side surfaces of the barrier ribs are formed so that the adsorbing power with respect to the phosphor ink or the reflector ink is larger than the upper surface of the barrier ribs. When forming the reflective layer, the phosphor and the reflector can be prevented from adhering to the upper surface of the partition wall.

  Further, in the step of arranging the electrodes on the plate in a stripe shape, the method of applying the ink by scanning the nozzle while discharging the ink containing the electrode material from the nozzle in a continuous flow, Even in the case of a simple cell structure, display electrodes and address electrodes can be easily formed.

[Embodiment 1]
(About overall structure and manufacturing method of PDP)
FIG. 1 is a schematic cross-sectional view of an AC surface discharge type PDP according to an embodiment of the present invention. Although only one cell is shown in FIG. 1, a PDP is configured by arranging a large number of cells emitting light of red, green, and blue alternately.

  This PDP has a front panel in which a discharge electrode 12 and a dielectric glass layer 13 are disposed on a front glass substrate 11, and a back panel in which address electrodes 16, barrier ribs 17 and a phosphor layer 18 are disposed on a rear glass substrate 15. And the discharge gas is enclosed in a discharge space 19 formed between the front panel and the back panel. This PDP is configured by the drive circuit shown in FIG. 16 is applied to drive.

In FIG. 1, for convenience, the discharge electrode 12 is shown in a cross section, but in reality, the discharge electrode 12 is arranged in a direction along the plane of FIG. 1 so as to form an orthogonal matrix with the address electrode 16. ing.
Front panel fabrication:
The front panel is manufactured by forming the discharge electrode 12 on the front glass substrate 11, covering the same with a lead-based dielectric glass layer 13, and further forming a protective layer 14 on the surface of the dielectric glass layer 13. .

The discharge electrode 12 is an electrode made of silver and can be formed by a conventional method of forming a silver paste for an electrode by screen printing and baking, but in this embodiment, as described later, an ink jet method is used. It forms using.
The dielectric glass layer 13 includes, for example, 70 wt% lead oxide [PbO], 15 wt% boron oxide [B ₂ O ₃ ], 10 wt% silicon oxide [SiO ₂ ], and 5 wt% aluminum oxide. Formed to a film thickness of about 30 μm by applying a composition obtained by mixing an organic binder [alpha-terpineol with 10% ethyl cellulose dissolved] by screen printing and baking at 520 ° C. for 20 minutes. To do.

The protective layer 14 is made of magnesium oxide (MgO), and is formed to a thickness of 0.5 μm by, for example, a sputtering method.
Back panel fabrication:
An address electrode 16 is formed on the rear glass substrate 15 by using an ink jet method in the same manner as the discharge electrode 12.

Next, after the glass material is repeatedly screen-printed, the partition wall 17 is formed by firing.
Then, the phosphor layer 18 is formed in the groove between the partition walls 17. The method of forming the phosphor layer 18 will be described in detail later. The phosphor layer 18 is formed by applying and firing the phosphor ink by a method of scanning while continuously ejecting the phosphor ink from the nozzle.

In the present embodiment, the height of the partition wall is set to 0.1 to 0.15 mm and the pitch of the partition wall is set to 0.15 to 0.3 mm in accordance with a 40-inch class HDTV.
Production of PDP by panel bonding:
Next, the front panel and the rear panel thus manufactured are bonded together using sealing glass, and the discharge space 19 partitioned by the partition wall 17 is exhausted to a high vacuum (for example, 8 × 10 −7 Torr). Then, a PDP is manufactured by enclosing a discharge gas (for example, He—Xe-based or Ne—Xe-based inert gas) at a predetermined pressure.

Next, a circuit block for driving the PDP is mounted as shown in FIG. 2 to manufacture a PDP display device.
In the present embodiment, the content of Xe in the discharge gas is set to 5% by volume or more, and the sealing pressure is set in the range of 500 to 800 Torr.
(About the formation method of an electrode and a fluorescent substance layer)
FIG. 3 is a schematic configuration diagram of an ink coating apparatus 20 used when forming the discharge electrode 12, the address electrode 16, and the phosphor layer 18.

  As shown in FIG. 3, in the ink application device 20, the electrode material ink or the phosphor ink is stored in the server 21, and the pressure pump 22 pressurizes and supplies this ink to the header 23. The header 23 is provided with an ink chamber 23 a and a nozzle 24, and the ink pressurized and supplied to the ink chamber 23 a is continuously ejected from the nozzle 24.

The header 23 is formed integrally with the ink chamber 23a and the nozzle 24 by machining and electric discharge machining of a metal material.
The electrode material ink is prepared so that silver particles as an electrode material have an appropriate viscosity together with glass particles, a binder, a solvent component, and the like.
The phosphor ink is prepared such that each color phosphor particle, silica, binder, solvent component and the like have an appropriate viscosity.

As the phosphor particles constituting the phosphor ink, those generally used in the PDP phosphor layer can be used. As a specific example,
Blue phosphor: BaMgAl ₁₀ O ₁₇ : Eu ²⁺
Green phosphor: BaAl ₁₂ O ₁₉ : Mn or Zn ₂ SiO ₄ : Mn
The red _{phosphor: (Y x Gd 1-x} ) BO 3: Eu 3+ or YBO _3: Eu ³⁺
Can be mentioned.

  In order to suppress nozzle clogging and particle precipitation, the average particle diameter of the silver particles and glass particles used in the electrode material ink and the phosphor particles used in the phosphor ink is preferably 5 μm or less. In order for the phosphor to obtain good luminous efficiency, the average particle size of the phosphor is preferably 0.5 μm or more. Therefore, here, silver particles, glass particles, and phosphors in the range of 0.5 to 5 μm (2 to 3 μm) are used.

Moreover, it is desirable that the viscosity of the phosphor ink is adjusted within a range of 1000 centipoise or less (10 to 1000 centipoise) at 25 ° C., and the electrode material ink is adjusted to 100 to 1000 centipoise.
The particle size of silica as an additive is 0.01 to 0.02 μm, and the addition amount is preferably 1 to 10% by weight, and further, the dispersant is 0.1 to 5% by weight, and the plasticizer is 0.1 to 1%. It is desirable to add by weight%.

The diameter of the nozzle 24 is 45 μm or more in order to prevent clogging of the nozzle, and is smaller than the groove width W between the partition walls 17, and is preferably set in the range of 45 to 150 μm.
In the server 21, the ink is stored while being mixed and stirred by a stirrer (not shown) attached in the server 21 so that particles (electrode material, phosphor particles, etc.) in the ink are not precipitated. .

The pressurizing force of the pressure pump 22 is adjusted so that the flow of ink ejected from the nozzle 24 becomes a continuous flow.
The header 23 is scanned on the front glass substrate 11 or the back glass substrate 15. The scanning of the header 23 is performed by a header scanning mechanism (not shown) that linearly drives the header 23 in this embodiment, but the header 23 may be fixed and the glass substrate may be linearly driven.

By scanning the header 23 and ejecting ink from the nozzles 24 so as to form a continuous ink flow 25 (jet line), the ink is uniformly applied on the glass substrate in a line shape.
In addition, in the ink application apparatus 20, as shown in FIG. 4, it can also be set as the structure which installs a some nozzle in the header 23, and scans, ejecting ink in parallel from each nozzle (in FIG. 4, Arrow A is the scanning direction). If a plurality of nozzles 24 are provided in this way, a plurality of ink lines 25 can be applied by a single operation.

In this way, the discharge electrode 12 is formed by applying the electrode material ink on the front glass substrate 11 using the ink application device 20, and the address electrode is applied by applying the electrode material ink on the back glass substrate 15. 16 is formed.
The discharge electrode 12 and the address electrode 16 formed in this manner are fired together when the dielectric glass layer 13 and the barrier ribs 17 are fired.

On the other hand, the phosphor ink is applied by the ink application device 20 along the partition wall 17 on the back glass substrate 15 for each of red, blue, and green. Then, red, green and blue phosphor inks are sequentially applied to predetermined grooves and dried, and then the panel is baked (at about 500 ° C. for 10 minutes) to form the phosphor layer 18.
Thus, the phosphor layer 18 is not formed by applying ink droplets as in the conventional ink jet method, but is formed by continuously applying ink. Is uniform.

In addition, in such an ink application device, if one header is provided with three ink chambers of red, blue, and green and nozzles of each color, the phosphor inks of three colors are jetted in parallel. Also, it is possible to apply phosphor inks of three colors in one scan.
[Embodiment 2]
The configuration and manufacturing method of the PDP in the present embodiment are the same as those in the first embodiment, but there are slight differences in the method for forming the phosphor layer. Hereinafter, a method of forming the phosphor layer in the groove between the partition walls of the rear glass substrate 15 will be described.

FIG. 5 is a schematic configuration diagram of an ink coating apparatus used when the phosphor layer 18 is formed in the present embodiment. FIG. 6 is a partially enlarged perspective view showing the coating operation.
This ink application device 20 is also the same as that used in the first embodiment, and the server 21 stores the phosphor ink. The pressure pump 22 pressurizes the phosphor ink to produce a header. 23. The header 23 is provided with an ink chamber 23a and a plurality of nozzles 24. The phosphor ink supplied under pressure is distributed from the ink chamber 23a to the nozzles 24 and continuously ejected. ing.

  However, in the ink coating apparatus 20 of the present embodiment, the ejection direction of each nozzle 24 is not perpendicular to the rear glass substrate 15 but inclined toward one partition as shown in FIGS. (In FIG. 7A, this inclination angle is represented by θ). By this inclination, the ink flow 25 ejected from each nozzle 24 does not collide with the central portion of the groove between the partition walls but on the side surfaces of the partition walls.

Therefore, the point that the phosphor ink is uniformly applied to the grooves between the partition walls of the rear glass substrate 15 is the same as in the first embodiment. However, in this embodiment, the phosphor is further disposed on the upper part of the side surface of the partition wall 17. Since ink can be applied, the phosphor layer 18 having a wider light emitting area can be formed.
Hereinafter, the operation and effect of the ink coating apparatus 20 will be described more specifically with reference to FIGS.

In the ink applicator 20, a header 23 is provided for each color of red, blue, and green, and the pitch of the nozzles 24 provided in the header 23 of each color is set to three times the cell pitch. As shown in FIG. 6, every two grooves are filled with phosphor ink as the header 23 is scanned.
After the header 23 is scanned in the direction of arrow A in FIG. 4 and a predetermined groove is filled with phosphor ink, the header 23 is rotated to change the positions of the end 23b and end 23c, and again in the direction of arrow A. By filling the grooves filled with the phosphor ink while scanning in the direction (or the direction opposite to the arrow A) again, the phosphor ink can be attached to the side surfaces of both partition walls.

FIG. 7 is a diagram for explaining the effect of the phosphor ink coating method of this embodiment.
In FIG. 7A, 24a represents the posture of the nozzle 24 when scanning the header 23 for the first time, 25a represents a continuous ink flow formed in that posture, and 24b scanned the header 23 again. In this case, the posture of the nozzle 24 is represented, and 25b represents an ink flow continuously formed in the posture.

  Since the ink flow 25a and the ink flow 25b are inclined by an angle θ from the direction perpendicular to the rear glass substrate 15 to the left and right partition walls, the ink streams 25a and 25b collide with the upper end of the side surface of each partition wall 17. Then, if it is made to flow to the bottom surface along the side surface, the phosphor ink can be attached to the upper part of the side surface of each partition wall. The solid line 26 in the figure represents the liquid level of the phosphor ink filled in this way.

On the other hand, FIG. 7B shows a state in which the ink flow 25 ejected from the nozzles 24 is perpendicular to the rear glass substrate 15 at the central portion of the groove between the partition walls. The phosphor ink is hardly attached to the side surface of the partition wall, and the liquid surface of the applied phosphor ink shows a tendency as shown by a solid line 27 in the figure. In the header 23 of the ink application device 20 of the present embodiment, two nozzles 24 are arranged toward both sides of the groove for applying ink, and phosphor ink is jetted in parallel from the two nozzles. In this case, the phosphor ink can be attached to both side surfaces of the groove by one scanning.

[Embodiment 3]
The overall configuration and manufacturing method of the PDP in the present embodiment are the same as those in the first embodiment, but the method of applying the phosphor ink at the time of forming the phosphor layer is different.
FIG. 8 is a view for explaining the method of applying the phosphor ink in the present embodiment, and shows a cross section obtained by cutting the rear glass substrate 15 and the header of the ink application device along the partition wall 17. In the figure, an arrow A indicates the scanning direction.

The ink coating apparatus of the present embodiment is the same as the ink coating apparatus 20 of the first embodiment. However, as shown in FIG. 8, the header 33 includes an air chamber in addition to the ink chamber 33a and the plurality of nozzles 34. 33b and a plurality of air injection nozzles 36 are provided, and compressed air is fed into the air chamber 33b from a compressor (not shown).
The air injection nozzle 36 is disposed on the rear side of each nozzle 34 (the rear side with respect to the scanning direction of the header 33).

  By using the ink coating apparatus having such a configuration, the phosphor ink ejected from the nozzle 34 forms a continuous ink flow, and is applied to the groove between the partition walls (see A in FIG. 9). In addition, the air flow 37 ejected from the air ejection nozzle 36 presses the phosphor ink applied to the central portion of the groove (see arrow 37a in FIG. 9B) and pushes it away in the side surface direction of the partition wall 17. The air flow 37 flows along the liquid surface 38 of the phosphor ink (see arrow 37b in FIG. 9B), and causes the phosphor ink to rise along the side surface of the partition wall 17.

This air flow 37 raises the phosphor ink 35 and also dries it, so that the phosphor ink raised on the side surface is fixed to the side surface. In this way, the phosphor layer can be easily formed on the side surfaces of the barrier ribs.
The width of the air flow 37 is of course set smaller than the dimension between the partition walls, but the momentum of the air flow depends on the coating amount and physical properties of the phosphor ink or the wettability between the phosphor ink and the partition walls. Adjust accordingly.

In addition, in the ink coating apparatus of this embodiment, if the heated compressed air is supplied to the air chamber 33b and the heated air is ejected from the air ejection nozzle 36, the drying power of the phosphor ink by the air flow. And the amount of phosphor attached to the side surfaces of the barrier ribs increases.
[Embodiment 4]
The present embodiment is the same as the third embodiment, but at the time of forming the phosphor, an external force other than an air flow is applied to the phosphor ink applied to the groove between the partition walls so as to stand on the side surfaces of the partition walls.

In the header 43 shown in FIG. 10, an ink stirring rod 46 is provided immediately behind the nozzle 44. In the figure, an arrow A indicates the scanning direction.
When this header 43 is used, the phosphor ink 48 filled in the groove from the nozzle 44 is pressed against the side surface of the partition wall by the rod 46 and is raised along this side surface, so that the phosphor ink reaches the top of the side surface. To be attached.

The penetration depth of the rod 46 into the ink liquid surface is appropriately adjusted according to the filling amount and physical properties of the phosphor ink or the wettability between the phosphor ink and the partition wall.
In addition, although explanation with the drawings is omitted, instead of scanning the rod after applying the phosphor ink to the groove between the partition walls, a wire supported in the direction along the partition wall is inserted into the groove and the center portion of the groove The same effect can also be obtained by pushing the phosphor ink filled in the liquid and adhering it to the side surfaces of the partition walls.

In addition, after applying the phosphor ink to the groove, the back glass substrate is vibrated to raise the phosphor ink on the side surface of the partition wall or to reverse the back glass substrate so that the phosphor ink is It is possible to use a method of flowing along the side surface of the partition wall by gravity, and the same effect can be expected.
In addition, in the formation process of the fluorescent substance layer demonstrated in the said Embodiments 2-4, if it carries out while heating a back glass substrate, the solvent component of fluorescent substance ink adhering to the side surface of a partition will rapidly evaporate, and an ink flow will be carried out. Therefore, the phosphor layer can be more favorably formed on the side wall of the partition wall.

In this case, the heating temperature of the rear glass substrate is desirably 200 ° C. or lower.
[Embodiment 5]
The present embodiment is the same as the first embodiment except that the nozzle is scanned in a state where the phosphor ink is cross-linked when the phosphor layer is formed.
FIG. 11 is a schematic cross-sectional view showing how the phosphor ink is applied in the present embodiment.

The configuration of the ink coating apparatus is the same as that of the ink coating apparatus 20 in FIG. 3, but the phosphor ink 50 discharged from the nozzle 24 is between the inner surface of the grooves between the partition walls of the rear glass substrate 15 during scanning. Scanning is performed while maintaining a state of being cross-linked by surface tension.
Thus, in order to maintain the state where the ink is cross-linked by the surface tension, it is necessary to keep the distance between the nozzle 24 and the back plate appropriately. Usually, the distance is set in the range of 5 μm to 1 mm. A stable coating can be obtained.

The optimum diameter of the nozzle 24 (nozzle diameter) exists depending on the interval between the partition walls and the ink discharge amount, but is usually preferably in the range of 45 to 150 μm.
If the nozzle is scanned while bridging the ink in this way, the phosphor ink discharged from the nozzle 24 can be stably and continuously applied to the groove between the partition walls of the rear glass substrate 15 regardless of the scanning speed. . That is, according to the present embodiment, since a continuous ink flow can be formed even if the scanning speed is slowed down, an expensive apparatus for scanning at high speed is not necessary.

Therefore, uniform coating can be realized with an inexpensive ink coating apparatus.
Further, if scanning is performed while forming a bridge of ink between the nozzle and the side surface of the partition wall, the ink can be adhered to the upper part of the side surface of the partition wall.
As the phosphor ink, the same one as described in the first embodiment may be used. When the ink is applied without being crosslinked, the phosphor ink having a high viscosity or the phosphor ink having a large surface tension is used. Although it is difficult to form a continuous flow even if it is ejected from the nozzle, if it is applied in a state where a bridge is formed as in this embodiment, a fluorescent ink having a relatively high viscosity or a fluorescent material having a large surface tension is applied. Even if body ink is used, a continuous flow can be formed.

Therefore, restrictions on the viscosity and surface tension of the phosphor ink to be used are reduced, and it can be said that the selection range of the ink material is wider.
Note that the method of applying the phosphor ink while crosslinking the phosphor ink as described above can also be performed using the header 23 having a plurality of nozzles 24 shown in FIG.
If one header is provided with three ink chambers of red, blue, and green and nozzles of each color and three color phosphor inks are applied in parallel, three colors can be scanned in one scan. A phosphor ink can also be applied.

By the way, in order to stably and continuously apply phosphor ink, it is desirable to form a state in which the nozzle tip and the groove of the back glass substrate 15 are cross-linked with ink before the ink application is started. .
The following can be considered as a method of forming this crosslink.
1. Before the nozzle is scanned, the nozzle is temporarily stopped at the end of the back glass substrate 15 and ink is ejected to some extent from the nozzle, thereby forming a bridge between the nozzle tip and the back glass substrate 15.

2. In a state where the distance between the nozzle tip and the rear glass substrate 15 is closer than the distance during scanning, The cross-linking is performed. Thereafter, application is performed while being separated by a distance at the time of scanning. 3. First, as shown in FIG. 12, the ink 60 is applied to the end portion 15 c of the back glass substrate 15.
For this application, a mechanism for applying the ink 60 to the end portion 15c may be provided separately in the ink application apparatus. However, the end portion is formed by ejecting ink from the nozzle with the nozzle 24 positioned at the end portion 15c. The phosphor ink 60 can be applied to 15c. Alternatively, the ink 60 may be applied to the end portion 15c using another device or tool before the rear glass substrate 15 is mounted on the ink application device.

Next, the nozzle tip is brought into contact with the ink 60 to form a bridge. Subsequently, ink is ejected from the nozzle while scanning the nozzle and applied. According to this method, the formation of the bridge and the application operation can be performed continuously.
[Embodiment 6]
FIG. 13 is a diagram showing how the phosphor ink is applied in the present embodiment.

The present embodiment is the same as the fifth embodiment, and the phosphor ink is applied in a crosslinked state, but the application is performed with a nozzle inserted in the groove between the partition walls.
Thus, by scanning with the nozzles 24 inserted into the grooves, the ink can be uniformly applied to the grooves in a crosslinked state as in the fifth embodiment. Further, since the nozzle 24 pushes the ink present in the central portion of the groove and adheres the ink to the upper part of the side wall of the partition wall, it is easy to form a phosphor layer on the side surface of the partition wall.

Of course, the outer diameter of the nozzle 24 is smaller than the distance between the partition walls, but the penetration depth of the nozzle 24 into the ink liquid surface is the filling amount and physical properties of the phosphor ink, or the phosphor ink and the partition wall. It adjusts appropriately according to the wettability and the like.
[Embodiment 7]
The configuration and manufacturing method of the PDP of the present embodiment are the same as those of the PDP of the first embodiment, but there are differences in the method of forming the partition walls 17 and the phosphor layer 18.

That is, in this embodiment, the material for forming the partition is selected so that the contact angle of the phosphor ink with respect to the side surface of the partition wall 17 is 90 ° or less and smaller than the contact angle with respect to the bottom surface of the recess (groove). Thus, the partition wall 17 is formed. By adjusting in this way, the phosphor ink easily adheres to the side surface of the partition wall 17.
The partition wall 17 can be manufactured by a method such as a screen printing method, but can also be formed by a thermal spraying method as described below.

FIG. 14 is an explanatory diagram of a method for forming partition walls by a thermal spraying method.
First, the surface of the rear glass substrate 15 (A in FIG. 14) on which the address electrodes 16 are formed is covered with a dry film 81 made of an acrylic photosensitive resin (B in FIG. 14).
The dry film 81 is patterned by photolithography. That is, the photomask 82 is placed on the dry film 81, and only the portion where the partition is to be formed is irradiated with ultraviolet light (UV) (C in FIG. 14), and development is performed. The dry film 81 is removed, and a mask of the dry film 81 is formed only on the portion where the partition wall is not formed (see D in FIG. 14). The development is performed in about 1% alkaline aqueous solution (specifically, sodium carbonate aqueous solution).

Then, a mixture of alumina and glass, which is a raw material for the partition walls, is plasma sprayed thereon.
FIG. 15 is an explanatory view of plasma spraying.
In this plasma spraying apparatus 90, a voltage is applied between the cathode 91 and the anode 92, arc discharge is generated at the tip of the cathode 91, and argon gas is fed into it to generate a plasma jet. A powder of raw material (a mixture of alumina and glass) is fed into this, and the raw material is melted in a plasma jet and sprayed onto the surface of the substrate 15. As a result, a raw material film 84 is formed on the surface of the substrate 15.

  In this way, the substrate 15 (E in FIG. 14) on which the film 84 is formed is immersed in a stripping solution (sodium hydroxide solution) to remove the mask of the dry film 81 (lift-off method). Accordingly, the portion 84b formed on the mask of the dry film 81 is removed from the raw material film 84, and only the portion 84a directly formed on the substrate 15 remains, which becomes the partition wall 17 (FIG. 14). F).

  As described above, the partition wall 17 is formed of a mixture of alumina and glass so that the contact angle with respect to the partition wall 17 is smaller than the contact angle with respect to the substrate 15 of the phosphor ink, whereby the side wall 170b (see FIG. 17A). ) Can be made larger than the adsorption force with respect to the phosphor ink of the bottom surface 170a of the recess (see A in FIG. 17). In addition to this, it is possible to similarly adjust the adsorptive power to the phosphor ink by using alumina, zirconia, or a mixture of zirconia and glass as the material of the partition walls.

FIG. 16 is a schematic configuration diagram of the ink coating apparatus 100 used when forming the phosphor layer 18.
The ink coating apparatus 100 has the same configuration as the ink coating apparatus 20 shown in FIG. 3. The header 103 is provided with a plurality of protruding nozzles 24, and phosphor ink is supplied from the ink chamber 103a to each nozzle 24. The liquid is distributed and discharged continuously.

The phosphor ink to be used may be the same as that described in the first embodiment, but preferably has a composition that easily adheres to the side surface 170b of the recess. When 10% by weight is used and terpineol (C ₁₀ H ₁₈ O) is used as a solvent, relatively good results are obtained.
In addition, examples of the solvent to be used include organic solvents such as diethylene glycol methyl ether and water, and examples of the binder include polymers such as PMMA and polyvinyl alcohol.

The diameter of the nozzle 24 is smaller than the groove width W between the partition walls 17 and is usually set to 150 μm or less, and is set to 45 μm or more in order to prevent clogging of the nozzle.
Using this ink coating apparatus 100, the phosphor ink is applied while cross-linking the phosphor ink between the nozzle 24 and the inner surface of the recess 170 as follows.
First, the header 103 is positioned at the end of the rear glass substrate 15, and the nozzle 24 and the inner surface of the concave portion 170 of the rear glass substrate 15 are brought into close contact with each other or brought into contact with each other. Thus, a crosslink is formed by the surface tension of the phosphor ink.

  Subsequently, while the header 103 is scanned, the pressure pump 22 is operated to continuously discharge the phosphor ink from the nozzle 24, thereby applying the phosphor ink to the concave portion 170 of the rear glass substrate 15. At this time, the distance between the nozzle 24 and the bottom surface 170a is kept small (usually 1 mm or less), and crosslinking due to the surface tension of the phosphor ink formed between the inner surface of the concave portion 170 of the back glass substrate 15 and the nozzle 24 is maintained. Scan while.

During scanning, it is desirable that the nozzle 24 and the rear glass substrate 15 do not come into contact with each other. However, since there are slight irregularities on the surface of the concave portion 170 of the rear glass substrate 15, the nozzle 24 and the concave portion 170 are not It is desirable that the distance from the bottom surface 170a be 5 μm or more.
The pressure of the pressurizing pump 22 at the time of scanning is adjusted so as to be an appropriate discharge amount based on the filling amount into the concave portion 170 and the scanning speed of the nozzle 24.

In this embodiment, scanning is performed at a slow speed of about several tens of mm / s, and the pressure of the pressure pump 22 is set to be small to reduce the discharge amount. However, a continuous flow is formed by cross-linking of the phosphor ink. Therefore, the phosphor ink can be uniformly applied to the recesses 170 to form a uniform phosphor layer.
In order to attach a large amount of phosphor ink to the side surface 170b of the concave portion 170, the filling amount of the phosphor ink into the concave portion 170 is set to be 80% or more of the space volume of the concave portion 170. It is desirable to set the phosphor content in the range of 20 to 60% by weight.

(Explanation of effect)
FIG. 17A is a schematic diagram showing the drying process of the phosphor ink filled in the recesses when the adsorbing power of the partition walls with respect to the ink is adjusted as in this embodiment.
In this embodiment, since the adsorption force with respect to the phosphor ink of the side surface 170b of the recess 170 is larger than the adsorption force with respect to the phosphor ink of the bottom surface 170a, the phosphor ink may fall toward the bottom surface 170a during drying. And remains attached to the side surface 170b of the recess.

Further, as shown in this figure, if the phosphor ink is filled so as to occupy 80% or more of the space volume of the concave portion 170, the effect of adhering the phosphor ink to the side surface 170b is remarkable.
On the other hand, FIG. 17B is a schematic view showing the drying process of the phosphor ink in the case where the adsorbing force with respect to the phosphor ink on the side surface of the recess is smaller than the adsorbing force with respect to the phosphor ink on the bottom surface. In this case, as shown in the figure, the phosphor ink tends to fall toward the bottom surface during drying and hardly remains on the side surface.

As described above, according to the method of manufacturing the PDP of the present embodiment, the phosphor layer can be formed uniformly along the partition wall, and the phosphor layer can be attached to the side surface of the recess. Accordingly, a PDP with high emission luminance can be manufactured.
The material of the partition wall 17 is not limited to the above material, and the contact angle of the phosphor ink with respect to the side surface of the partition wall 17 may be selected so as to be smaller than the contact angle with respect to the bottom surface of the recess. However, the contact angle of the phosphor ink with respect to the side surface of the partition wall 17 is preferably 90 ° or less in order to obtain good adhesion to the side surface.

  In the present embodiment, the material of the partition wall 17 is selected so that the contact angle of the phosphor ink with respect to the partition wall 17 is smaller than that of the rear glass substrate 15, so that Although the adsorbing force was adjusted to be smaller than the adsorbing force with respect to the phosphor ink on the bottom surface of the recess, the adsorbing force with respect to the phosphor ink is influenced not only by the contact angle with respect to the surface of the phosphor ink but also by the surface roughness. That is, the greater the surface roughness, the greater the adsorption force with respect to the phosphor ink.

Therefore, the same effect can be obtained by making the surface roughness of the side surface of the recess larger than the surface roughness of the bottom surface of the recess.
The surface roughness is adjusted by previously polishing the surface of the substrate 15 to reduce the surface roughness, or by plasma spraying conditions (for example, the flow rate of argon gas and the applied voltage) when the partition walls are formed by a thermal spraying method. When the surface roughness is adjusted to be large, or when the partition walls are formed by the screen printing method, the surface roughness can be increased by lowering the firing temperature.

Further, if the contact angle with respect to the side surface of the concave portion of the phosphor ink is made smaller than the contact angle with respect to the bottom surface of the concave portion, and the surface roughness of the side surface of the concave portion is made larger than the surface roughness of the bottom surface, the effect becomes more remarkable. It becomes.

In the present embodiment, the case where the phosphor ink is applied while being cross-linked from the nozzle has been described. However, other application methods can be similarly applied. For example, even when a normal ink jet method or a screen printing method is used, the same effect can be obtained if the adsorption force with respect to the phosphor ink on the side surface of the recess is made larger than the adsorption force with respect to the phosphor ink on the bottom surface.

[Embodiment 8]
The manufacturing method of the PDP of the present embodiment is the same as that of the seventh embodiment. However, in the seventh embodiment, the contact angle of the phosphor ink with respect to the side surface of the concave portion is selected by selecting the partition material. In the present embodiment, the contact angle with respect to the side surface of the concave portion of the phosphor ink is reduced by forming a film that increases the contact angle with respect to the bottom surface of the concave portion of the phosphor ink. Adjust the contact angle to be larger than the contact angle with respect to the bottom surface.

For example, the film is formed on the bottom surface of the concave portion by, for example, melting a fluorine resin such as polytetrafluoroethylene at a high temperature on the surface of the back glass substrate 15 and applying it by a spin coating method. Can be performed by forming the address electrode 16 and the partition wall 17.
Then, after forming such a film, if the concave portion is filled with phosphor ink as in Embodiment 7, the contact angle with respect to the side surface of the concave portion of the phosphor ink is larger than the contact angle with respect to the bottom surface. As shown in FIG. 17A, a lot of phosphor ink adheres to the side surface.

And a favorable fluorescent substance layer is formed in the bottom face and side surface of a recessed part by baking this. When the above film is formed of an organic compound such as a fluororesin, the film is burned off when the phosphor layer is baked, so that no film remains on the completed PDP.
In the present embodiment, the case of applying by the ink jet method has been described, but the application method is not limited to this. For example, even in the case of the screen printing method, the same effect can be obtained if the contact angle with respect to the side surface of the concave portion of the phosphor paste is made smaller than the contact angle with respect to the bottom surface.

[Embodiment 9]
FIG. 18 is a diagram showing the state of phosphor ink application in the present embodiment. The manufacturing method of the PDP in the present embodiment is the same as the manufacturing method of the seventh embodiment. However, after the partition wall 17 is formed on the rear glass substrate 15, the adsorptivity to the phosphor ink on the upper surface of the partition wall 17 is changed. The difference is that the side surface 17 is made smaller than the adsorptivity to the phosphor ink, and then the phosphor ink is applied.

As a method of making the adsorptivity to the phosphor ink on the upper surface of the partition wall 17 smaller than the adsorptivity to the phosphor ink on the side surface of the partition wall 17, as shown in FIG. 18, the upper surface of the partition wall 17 is made of a water repellent material. A method for forming the water film 110 may be mentioned.
The water repellent film 110 can be formed by applying a fluororesin such as polytetrafluoroethylene to the upper surface of the partition wall 17.

Specifically, in the step of forming a partition wall by the thermal spraying method described in the seventh embodiment, after the partition wall material film 84 is formed on the substrate 15 (state E in FIG. 14), the mask of the dry film 81 is removed. If the molten fluororesin is applied by spin coating before, the water repellent film 110 made of fluororesin can be formed on the upper surface of the partition wall 17.
Thus, by reducing the adsorptivity of the upper surface of the partition wall 17 to the phosphor ink, it is possible to prevent the phosphor ink from adhering to the upper surface of the partition wall when applying the phosphor ink.

Therefore, when the front panel and the rear panel are bonded together and sealed with sealing glass, the problem that sealing is hindered by the phosphor adhering to the upper surface of the partition wall can be solved. Further, since the water repellent film 110 is burned off when the phosphor layer is baked, it does not remain in the manufactured PDP.
In addition, as a method for reducing the adsorption force of the upper surface of the partition wall 17 with respect to the phosphor ink, a method of reducing the surface roughness of the upper surface of the partition wall 17 by, for example, polishing the upper surface of the partition wall 17 can also be mentioned. it can.

In the present embodiment, the case where the phosphor is applied by the ink jet method has been described. However, the application method is not limited to this, and other methods can be applied. For example, even when the coating is applied by screen printing, the same effect can be obtained if the adsorption force with respect to the phosphor paste on the upper surface of the partition wall is made smaller than the adsorption force with respect to the phosphor paste on the side surface.
[Embodiment 10]
The present embodiment is basically the same as the fifth embodiment, but the outer diameter of the nozzle is set larger than the groove width between the partition walls.

FIG. 19 is a cross-sectional view showing an outline of the ink coating apparatus of the present embodiment. In this ink coating device 120, phosphor ink is put in the server 121, and is mixed and stirred internally so that precipitation of phosphor particles does not occur. The phosphor ink in the server 121 is ejected from the nozzle 122 when pressurized by a not-shown pressurizing unit.
Further, the server 121 can scan in the front-back direction of FIG. 19 along the partition wall 17 on the rear glass substrate 15 by a scanning mechanism (not shown).

At the time of scanning, the phosphor ink 123 discharged from the nozzle 122 is scanned while maintaining a state in which the phosphor ink 123 is bridged by the surface tension between the inner surfaces of the grooves between the partition walls of the rear glass substrate 15.
The outer diameter of the nozzle 122 is set so as to be larger than the interval between the partition walls 17 and not to protrude to the adjacent groove. By doing so, the distance between the partition wall 17 and the nozzle 122 becomes relatively short, so that the phosphor ink is easily cross-linked, and further, the nozzle tip and the top of the partition wall come into contact with each other during application due to the deflection of the back glass substrate 15 or the like. However, the discharge port of the nozzle 122 is not blocked.

In order to maintain the crosslinked state of the phosphor ink, the distance between the tip of the nozzle 122 and the partition 17 during scanning is preferably set to 1 mm or less.
[Embodiment 11]
The present embodiment is similar to the fifth embodiment, but there is a difference in the shape of the tip of the nozzle.
FIG. 20 is a main part schematic diagram of the phosphor ink coating apparatus in the present embodiment. In the nozzle 24 of the fifth embodiment, the opening edge at the tip is parallel to the surface of the rear glass substrate 15, whereas in the nozzle 124 of the present embodiment, the opening edge of the tip is the surface of the rear glass substrate 15. It is inclined with respect to.

Even if such a nozzle 124 is used, the ink can be uniformly applied to the groove in a crosslinked state as in the fifth embodiment.
In order to facilitate crosslinking, the distance between the tip of the nozzle 124 and the surface of the rear glass substrate is set to 1 mm or less.
If scanning is performed with the tip of the nozzle 124 inserted into the groove between the partition walls, the nozzle 124 functions to push the ink present at the center of the groove, so that the ink tends to adhere to the side surface of the groove.

In addition, since the opening surface of the nozzle 124 is inclined, even if the nozzle tip and the back glass substrate come into contact with each other during application due to the deflection of the back glass substrate 15, the discharge port of the nozzle 124 is not blocked. Ink can be applied continuously stably. The inclination angle of the opening surface of the nozzle 124 with respect to the surface of the rear glass substrate is preferably in the range of 10 ° to 90 °.
The nozzle 124 of FIG. 20 has an inclined opening surface at the tip, but the nozzle is shaped so that at least a part of the opening edge is separated from the glass substrate than the tip of the opening edge. If it is, the same effect is produced.

For example, the following modifications can be given.
As shown in the nozzle 125 in FIG. 21, the nozzle tip is opened stepwise.
As shown in the nozzle 126 shown in FIG. 22, the nozzle 126 is bent in the middle so that the opening surface 126 a at the tip of the nozzle is inclined with respect to the surface of the rear glass substrate 15.
Like the nozzle 127 shown in FIG. 23, an opening surface 127 a is formed in two directions at the tip of the nozzle, and each opening surface is inclined with respect to the surface 15 a (15 b) of the back glass substrate 15. In FIG. 23, a solid line 15a indicates that the surface of the back glass substrate 15 is in contact with the tip of the nozzle 127, and a one-dot chain line 15b indicates that this is separated.

Even when such nozzles 125 to 127 are used, the opening surface is not blocked when the tip of the nozzle is in contact with the surface of the back glass substrate 15, so that scanning can be performed while the nozzle is in contact with the surface of the back glass substrate 15. It is possible to perform stable and continuous ink application.
[Embodiment 12]
FIG. 24 is a schematic cross-sectional view of the PDP according to the present embodiment. The structure and manufacturing method of this PDP is the same as that of the PDP of the first embodiment (see FIG. 1), but the reflective layer 130 is disposed in the groove between the partition walls 17, and the phosphor is placed on the reflective layer 130. Layer 18 is disposed. By disposing the reflective layer 130 in this way, the luminance of the panel can be improved (10 to 20%).

Formation of the reflective layer 130 and the phosphor layer 18 are formed by applying the reflector ink and the phosphor ink using the ink coating apparatus as shown in FIG. 3 of the first embodiment.
The reflective ink is a mixture of a reflective material, a binder, and a solvent component. As the reflective material, a white powder having a high reflectance such as titanium oxide or alumina can be used. Titanium oxide having a diameter of 5 μm or less is good.

In the reflective layer forming method of the present embodiment, the method for forming the phosphor layer described in the seventh and eighth embodiments is applied to the formation of the reflective layer 130, and the adsorption power of the side wall of the partition wall 17 to the reflective material ink is increased. The adsorption force of the bottom surface of the recess (groove) with respect to the reflecting material ink is made larger.
That is, the material of the partition is selected so that the contact angle of the reflector ink with respect to the side surface of the partition wall 17 is smaller than the contact angle of the reflector ink with respect to the bottom surface of the recess, or the surface roughness of the side surface of the partition wall 17 is set to the bottom surface of the recess. Or larger than the surface roughness. As a result, as described with reference to FIG. 17A, the reflector ink easily adheres to the side surface of the partition wall 17, which contributes to the improvement of the brightness of the PDP.

In order to make the reflector ink easily adhere to the side surface 170b of the recess, it is preferable to use 0.1 to 10% by weight of ethyl cellulose as a binder and terpineol (C ₁₀ H ₁₈ O) as a solvent.
In addition, organic solvents such as diethylene glycol methyl ether and water can be used as preferred solvents, and polymers such as PMMA and polyvinyl alcohol can be used as binders.

In order to make the thickness of the reflective layer uniform, it is desirable that the ink viscosity is low (1 to 1000 centipoise at 25 ° C.).
Further, in order to attach a large amount of the reflective material ink to the side surface 170b of the concave portion 170, the amount of the reflective material ink filled in the concave portion 170 is set to be 80% or more of the space volume of the concave portion 170. It is desirable to set the content of the reflective material in the range of 20 to 60% by weight.

[Embodiment 13]
The configuration of the PDP in the present embodiment is the same as that of the PDP in the twelfth embodiment, and a reflective layer 130 is provided (see FIG. 24). Further, the manufacturing method is basically the same as the method described in the twelfth embodiment, but in this embodiment, the adsorptivity to the reflecting material ink on the upper surface of the partition wall 17 is changed to the adsorptive property to the reflecting material ink on the side surface of the partition wall 17. The point of making it smaller is different.

As shown in FIG. 18 of the ninth embodiment, the adjustment of the adsorptivity to the reflective material ink is performed by forming a water repellent film 110 made of a water repellent material on the upper surface of the partition wall 17 so that the reflective material ink is applied to the side surface of the partition wall. This can be achieved by increasing the contact angle with respect to the upper surface of the partition wall rather than the contact angle.
Alternatively, the surface roughness of the upper surface of the partition wall can be made smaller than the surface roughness of the side surface of the partition wall.

When the reflective material ink is applied in this way, the reflective material ink hardly adheres to the upper surface of the partition wall, and even if it is adhered, it moves toward the side surface of the partition wall during drying. Hard to remain.
Therefore, when the front panel and the back panel are bonded together and sealed with sealing glass, the problem that the sealing is hindered by the reflective material attached to the upper surface of the partition wall can be solved.

[Embodiment 14]
The configuration of the PDP of the present embodiment is the same as that of the PDP of the twelfth embodiment, and the reflective layer 130 is disposed (see FIG. 24).
Formation of the reflective layer 130 and the phosphor layer 18 are formed by applying the reflector ink and the phosphor ink using the ink coating apparatus as shown in FIG. 3 of the first embodiment.

In the present embodiment, the method for forming the phosphor layer described in the fifth embodiment is applied to the formation of the reflective layer 130, and the reflective ink is scanned with the nozzle in a state where it is cross-linked by the surface tension. The reflective layer 130 is formed by applying continuously between the partition walls, and then drying and firing the partition walls.
In order to maintain the crosslinked state of the reflector ink, the distance between the nozzle tip and the partition wall 17 during scanning is preferably set in the range of 0 μm to 1 mm.

According to this reflective layer forming method, the same effect as described in the fifth embodiment, that is, the reflective material ink can be applied uniformly with an inexpensive ink coating apparatus, and the reflective material ink having a wide range of viscosity and surface tension. There is an effect that can be used.
Next, the phosphor layer 18 is formed on the reflective layer 130 thus formed by applying phosphor ink in the same manner as in the fifth embodiment.

The reflective layer 130 can also be formed by applying the method described in the sixth, tenth, and eleventh embodiments using the above-described reflective material ink, and has the same effect. .
(Other matters)
In the first to fourteenth embodiments, the AC type PDP has been described as an example. However, the present invention is not limited to the AC type, and the present invention can be similarly applied to a PDP in which partition walls are arranged in a stripe shape.

Further, as in the seventh, eighth, ninth, twelfth, and thirteenth embodiments, the technique for adjusting the adhesion state of the ink by adjusting the adsorption force of the partition wall and the bottom surface of the recess with respect to the phosphor ink or the reflective material ink is as follows. However, the present invention can also be applied to a DC type PDP arranged in a cross-beam shape, and has the same effect.

(Examples 1-5)
Based on Embodiment 1, PDP of Examples 1-5 was produced.
Table 1 lists the composition of the electrode material ink (Ag ink) and phosphor ink used in Examples 1 to 5 and the ink viscosity.
In Examples 1 to 5, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ as the blue phosphor, Zn ₂ SiO ₄ : Mn as the green phosphor, and (Y _x Gd _1-x ) BO ₃ : Eu as the red phosphor. ³⁺ was used.

The composition of the glass used for the electrode material ink (silver ink) in the table is 70% by weight of lead oxide (PbO), 15% by weight of silicon oxide (SiO ₂ ), and 15% by weight of boron oxide (B ₂ O ₃ ). . The molecular weight of ethyl cellulose used as the binder is 200,000, and the molecular weight of the acrylic resin is 100,000.
In Example 1, a nozzle having a nozzle diameter of 50 μm was used, and electrode material ink was discharged while scanning the nozzle tip and the back glass substrate at a distance of 1 mm to form electrodes 12 and 16 having an electrode width of 60 μm.

The interval (cell pitch) between the partition walls 17 was set to 0.15 mm, and the height was set to 0.15 mm.
The discharge gas was neon (Ne) gas containing 10% xenon (Xe) gas, and the sealing pressure was 500 Torr.
In Examples 2 to 5, the electrodes 12 and 16 were formed with a nozzle diameter of 45 μm and an electrode width of 50 μm.

The discharge gas was neon (Ne) gas containing 20% xenon (Xe) gas, and the sealing pressure was 600 Torr.
About PDP of Examples 1-5, it was made to discharge by discharge sustain voltage 150V frequency 30KHz, and the brightness | luminance was measured. The conditions for measuring the luminance are the same in the following examples.
The wavelength of the ultraviolet light was mainly the excitation wavelength by the molecular beam of Xe centered at 173 nm. The luminance measurement results were as shown in Table 1.

In Table 2, the composition of the electrode material ink (Ag ink) and phosphor ink used in the following Examples 6 to 13, the ink viscosity, and the luminance measurement result of the panel are listed.
Also in Examples 6 to 13, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ as the blue phosphor, Zn ₂ SiO ₄ : Mn as the green phosphor, and (Y _x Gd _1-x ) BO ₃ as the red phosphor: Eu ³⁺ was used.

(Example 6)
Based on the second embodiment, No. 2 in Table 2 was obtained. A PDP was produced using an electrode material ink (Ag ink) and a phosphor ink having a composition and viscosity range shown in FIG.
The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 500 Torr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.

(Example 7)
Based on the third embodiment, No. 1 in Table 2 was obtained. A PDP was prepared using electrode material ink (Ag ink) and phosphor ink having the composition and viscosity range shown in FIG.
As the discharge gas, neon (Ne) gas containing 6% xenon (Xe) gas was used, and the sealing pressure was 500 Torr.

The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.
(Example 8)
Based on the fifth embodiment, No. 2 in Table 2 was obtained. A PDP was produced using the electrode material ink (Ag ink) and phosphor ink having the composition shown in FIG.

When applying the phosphor ink, the phosphor ink has a viscosity of 10 to 1000 centipoise at 25 ° C. When a nozzle with a nozzle diameter of 80 μm is used and pressurized with 0.5 kgf / cm 2, the phosphor ink is ejected from the nozzle. The phosphor ink was crosslinked between the nozzle tip and the partition wall 17 by surface tension.
By keeping the distance between the tip of the nozzle and the back plate at 100 μm and moving and scanning the back glass substrate 15 at a speed of 50 mm / s, the phosphor ink can be continuously applied to the grooves between the partition walls. did it.

Note that since the ink discharge amount is small under these conditions, a continuous flow is not formed when the phosphor ink is discharged from the nozzle under the same discharge conditions without forming a bridge.
After applying the phosphor ink of each color, the phosphor layer was formed by baking at about 500 ° C. for 10 minutes. The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 600 Torr.

The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.
Example 9
Based on the sixth embodiment, No. in Table 2 above. A PDP was prepared using electrode material ink (Ag ink) and phosphor ink having the composition shown in FIG.

The height of the partition was set to 120 μm. When applying the phosphor ink, the distance between the nozzle tip and the back glass substrate 15 was set to 20 μm. The viscosity of the phosphor ink was 10 to 1000 centipoise at 25 ° C. The discharge gas was neon (Ne) gas containing 10% xenon (Xe) gas, and the sealing pressure was 500 Torr.
The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.

(Example 10)
Based on the seventh embodiment, No. in Table 2 above. A PDP was prepared using electrode material ink (Ag ink) and phosphor ink having the composition shown in FIG. A PDP was prepared.
The partition walls of the rear panel were formed using a mixture of alumina and glass, and had a pitch of 140 μm, a width of 30 μm, and a height of 120 μm.

The contact angle of the phosphor ink with respect to the side surface 170b of the partition wall and the bottom surface 170a of the recess 170 was measured visually. Moreover, the surface roughness was measured according to the surface roughness measuring method (10-point average roughness) of JIS standard.
The contact angle with respect to the side surface 170b of the phosphor ink is about 8 °, the surface roughness of the side surface 170b is about 5 μm, the contact angle with respect to the bottom surface 170a of the phosphor ink is about 13 °, and the surface roughness of the bottom surface 170a is about. It was 0.5 μm.

The nozzle 44 has a nozzle diameter of 80 μm. During scanning, the distance between the nozzle tip and the bottom surface of the recess is set to 100 μm, and scanning is performed at a speed of 50 mm / s while applying a pressure of 0.5 kgf / cm ^2. As a result, the phosphor ink was applied to fill about 90% of the space volume of the recess.
After filling and drying each color phosphor ink, the phosphor layer was formed by baking at about 500 ° C. for 10 minutes.
When the cross-sectional shape of each color phosphor layer formed was observed with an SEM, the average at the bottom of the recess was about 20 μm and the average thickness at the side was about 25 μm, and the phosphor layer was uniformly formed. It was confirmed.

The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 800 Torr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.
(Example 11)
Based on the ninth embodiment, No. 2 in Table 2 above. A PDP was prepared using an electrode material ink (Ag ink) and a phosphor ink having the composition shown in FIG.

The partition walls of the back panel were formed using alumina and had a pitch of 140 μm, a width of 30 μm, and a height of 120 μm, and a water repellent film made of polytetrafluoroethylene was formed on the top surface of the partition walls.
The contact angle of the phosphor ink with respect to the side surface of the formed partition wall was about 5 °. The contact angle of the phosphor ink with the water repellent film on the upper surface of the partition wall was about 30 °.

The nozzle has a nozzle diameter of 100 μm. During scanning, the distance between the nozzle tip and the bottom of the recess is set to 100 μm, and scanning is performed at a speed of 100 mm / s while applying a pressure of 0.7 kgf / cm 2. The phosphor ink was applied to fill about 90% of the space volume of the recesses.
After applying phosphor ink of each color and drying, the phosphor layer was formed by baking at about 500 ° C. for 10 minutes.

When the cross-sectional shape of each color phosphor layer formed was observed with an SEM, it was confirmed that the phosphor layer was uniformly formed with an average thickness of about 20 μm on the side surface as well as the bottom surface of the recess.
In general, when such a nozzle having a relatively large diameter is used, ink tends to adhere to the upper part of the partition during ink injection, but in this embodiment, the phosphor adheres to the upper surface of the partition. There wasn't. This is presumably because the adsorbing force of the upper surface of the partition wall with respect to the phosphor ink is smaller than the side surface of the partition wall, so that the ink adhering to the upper surface of the partition wall moved to the side surface of the partition wall as it dried.

The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 500 Torr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.
In the PDP manufacturing method of this example, instead of forming a water repellent film on the upper surface of the partition wall, the upper surface of the partition wall was polished to reduce its surface roughness (the surface roughness of the side wall of the partition wall was about 5 μm). Even when the surface roughness of the upper surface of the barrier rib was about 0.5 μm, the phosphor layer could be uniformly applied to the recess without the phosphor adhering to the upper surface of the barrier rib.

(Example 12)
Based on the tenth embodiment, No. in Table 2 above. A PDP was prepared using electrode material ink (Ag ink) and phosphor ink having the composition shown in FIG.
The distance between the partition walls 17 is 110 μm. The nozzle 122 used had an inner diameter of 80 μm and an outer diameter of 120 μm, and the distance between the tip of the nozzle 122 and the top of the partition wall 17 during scanning was set to 20 μm.

The phosphor ink was blended in a viscosity of 10 to 1000 centipoise at a shear rate of 200 sec ⁻¹ and placed in the server 121. When pressure was applied at 0.5 kgf / cm ² , the phosphor ink 123 was discharged from the nozzle 122, and the phosphor ink 123 was cross-linked between the tip portion of the nozzle 122 and the partition wall 17 by surface tension.
In this state, the back glass substrate 15 was moved and scanned at a speed of 50 mm / s, whereby the phosphor ink could be continuously applied to the grooves between the partition walls.

The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 500 Torr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.
(Example 13)
Based on the eleventh embodiment, No. in Table 2 above. A PDP was prepared using an electrode material ink (Ag ink) and a phosphor ink having the composition shown in FIG.

The distance between the partition walls 17 is 110 μm, the inner diameter of the nozzle 124 is 60 μm, the outer diameter is 100 μm, the inclination of the opening surface of the nozzle 124 with respect to the surface of the rear glass substrate is 45 °, and the distance between the tip of the nozzle 124 and the surface of the rear glass substrate 15. Was set to 20 μm.
Thereby, the phosphor ink could be continuously and stably applied to the groove between the partition walls.
The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 500 Torr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.

  Table 3 lists the electrode material ink (Ag ink), reflector ink, phosphor ink composition, ink viscosity, and panel brightness measurement results used in Examples 14 to 17 below.

Also in Examples 14 to _17, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ as a blue phosphor, Zn ₂ SiO ₄ : Mn as a green phosphor, and (Y _x Gd _1-x ) BO ₃ as a red phosphor: Eu ³⁺ was used.
(Example 14)
Based on the twelfth embodiment, No. in Table 3 above. A PDP was prepared using an electrode material ink (Ag ink), a reflector ink, and a phosphor ink having the composition shown in FIG.

The partition walls were formed of a mixture of alumina and glass, and had a pitch of 140 μm, a width of 30 μm, and a height of 120 μm.
Reflector ink uses 45% by weight of titanium oxide with an average particle diameter of 3 μm as a reflective material, 1.8% by weight of ethyl cellulose as a binder, 53.2% by weight of terpineol as a solvent, and the viscosity is adjusted to 50 centipoise at 25 ° C. did.

The contact angle of the reflector ink with respect to the partition wall was about 8 °. Moreover, the contact angle with respect to the bottom face (back glass substrate 15) of the recess was about 13 °.
A nozzle having a nozzle diameter of 80 μm was used, and the distance between the nozzle tip and the back glass substrate 15 during scanning was set to 100 μm.
When pressure was applied at 0.5 kgf / cm ² , the reflector ink was ejected from the nozzle, and a bridge was formed. In this state, the back glass substrate was scanned in the direction of the partition wall, whereby the ink was continuously injected into the groove between the partition walls, and the reflective material ink was applied so as to fill about 90% of the space volume of the recess.

After the applied reflective material ink was dried, the reflective layer was formed by baking at about 500 ° C. for 10 minutes.
When the cross-sectional application shape of the formed reflective layer was observed with an SEM, it was confirmed that the reflective material was uniformly applied with a thickness of about 20 μm not only on the bottom surface of the groove but also on the side wall of the partition wall.
And on this reflective layer, fluorescent substance ink was apply | coated by the method similar to this, and the fluorescent substance layer was formed.

The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 500 Torr. The panel luminance was as shown in Table 3, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.
In this embodiment, the contact angle of the reflective ink with respect to the partition wall was adjusted to be small. However, the glass partition wall having a surface roughness of about 5 μm with respect to the rear glass substrate 15 having a surface roughness of about 0.5 μm. In the same manner as this, when a reflective ink was applied to the groove between the partition walls, a uniform reflective layer having a thickness of 20 μm could be formed.

(Example 15)
Based on the thirteenth embodiment, No. in Table 3 above. A PDP was prepared using an electrode material ink (Ag ink), a reflector ink and a phosphor ink having the composition shown in FIG.
The partition walls were made of alumina and had a pitch of 140 μm, a width of 30 μm, and a height of 120 μm. A water repellent film made of polytetrafluoroethylene was formed on the upper surface of the partition wall.

The reflector ink uses 45% by weight of alumina (Al ₂ O ₃ ) having a particle diameter of 0.5 μm as a reflective material, 1.0% by weight of polyvinyl alcohol as a binder, 54% by weight of water as a solvent, and a viscosity of 25 ° C. Adjusted to 100 centipoise.
The contact angle of the reflector ink with respect to the side wall of the partition was about 5 °, and the contact angle of the reflector ink with respect to the upper part of the partition was about 30 °.

A nozzle having a nozzle diameter of 100 μm was used, and the distance between the nozzle tip and the partition during scanning was set to 100 μm.
When pressure was applied at 0.7 kgf / cm ² with a pressurizer, the reflector ink was discharged from the nozzle and crosslinked. In this state, the back panel substrate is scanned at a speed of 100 mm / s in the direction along the partition wall, whereby the reflector ink is continuously injected into the groove between the partition walls, and the reflector ink is about 90% of the groove volume. It was applied so as to be filled.

After the applied reflective material ink was dried, the reflective layer was formed by baking at about 500 ° C. for 10 minutes.
When such a relatively large diameter nozzle is used, the ink tends to remain on the upper part of the partition during ink injection. However, after forming the reflective layer by the method of this embodiment, the cross-sectional coating shape is obtained by SEM. As a result of the observation, it was confirmed that the reflective material was uniformly applied to the inner surface of the groove with a thickness of about 20 μm without adhering to the upper surface of the partition wall.

Then, a phosphor layer was formed on the reflective layer by the same method as in Example 10. The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 500 Torr.
The panel luminance was as shown in Table 3, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.

In this embodiment, the contact angle of the reflector ink with respect to the partition is adjusted to be small, but the surface roughness of the side surface of the glass partition is about 5 μm, and the surface roughness of the top surface of the glass partition is about 0.5 μm. When the reflective ink was applied to the grooves between the partition walls, a uniform reflective layer having a thickness of 20 μm could be formed on the side surfaces of the partition walls.
(Example 16)
Based on the fourteenth embodiment, No. 1 in Table 3 above. A PDP was prepared using an electrode material ink (Ag ink), a reflector ink and a phosphor ink having the composition shown in FIG.

The distance between the partition walls was 110 μm, the nozzle used had an inner diameter of 80 μm and an outer diameter of 120 μm, and the distance between the tip of the nozzle and the top of the partition wall was set to 20 μm.
Reflector ink uses 30 to 60% by weight of titanium oxide having an average particle size of 0.5 to 5 μm as a reflective material, 0.1 to 10% by weight of ethyl cellulose as a binder, 30 to 60% by weight of terpineol as a solvent, and viscosity. Was adjusted to 10 to 1000 centipoise at 25 ° C.

When pressure was applied at 0.5 kgf / cm ² by the pressurizer, the reflector ink was ejected from the nozzle, and the reflector ink was cross-linked by the surface tension between the tip of the nozzle and the side surface of the partition wall 17.
In this state, the back glass substrate 15 was moved and scanned at a speed of 50 mm / s, whereby the reflector ink could be continuously applied to the grooves between the partition walls.
After drying, the reflective layer could be formed by baking at about 500 ° C. for 10 minutes.

Then, a phosphor layer was formed on the reflective layer by the same method as in Example 10.
The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 500 Torr.
The panel luminance was as shown in Table 3, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.

(Example 17)
Based on the fourteenth embodiment, No. 1 in Table 3 above. A PDP was prepared using an electrode material ink (Ag ink), a reflector ink and a phosphor ink having the composition shown in FIG.
The reflector ink used was the same as in Example 16 above, but was applied using a nozzle 124 (see FIG. 20) in which the same opening surface as in Example 13 was formed with an inclination.

That is, the distance between the partition walls 17 is 110 μm, the inner diameter of the nozzle 124 is 60 μm, the outer diameter is 100 μm, the inclination of the opening surface of the nozzle 124 with respect to the surface of the rear glass substrate is 45 °, and the tip of the nozzle 124 and the surface of the rear glass substrate 15 Was set to 20 μm. Thereby, the reflector ink could be continuously and stably applied to the grooves between the partition walls.
Then, a phosphor layer was formed on the reflective layer by the same method as in Example 10. The discharge gas was neon (Ne) gas containing 5% xenon (Xe) gas, and the sealing pressure was 500 Torr.

  The panel luminance was as shown in Table 3, and the wavelength of the ultraviolet light was mainly the excitation wavelength by the Xe molecular beam centered at 173 nm.

  Since the present invention is an effective technique for manufacturing a PDP having a fine cell structure, it is suitable for a high-definition television.

It is a schematic sectional drawing of the alternating current surface discharge type PDP which concerns on one embodiment of this invention. It is a schematic drive block diagram of PDP which concerns on one embodiment of this invention. In Embodiment 1, it is a schematic block diagram of the ink coating device used when forming a discharge electrode, an address electrode, and a fluorescent substance layer. It is a perspective view which shows the filling operation | movement using an example of the said ink coating device. FIG. 4 is a schematic configuration diagram of an ink coating apparatus used when forming a phosphor layer in a second embodiment. It is a partial expansion perspective view which shows operation | movement of the ink application apparatus of FIG. It is a figure explaining the effect of the coating method of the phosphor ink in Embodiment 2. It is a figure explaining the application method of fluorescent substance ink in Embodiment 3. FIG. It is a figure explaining the application method of fluorescent substance ink in Embodiment 3. FIG. It is a figure explaining the application method of fluorescent substance ink in Embodiment 4. FIG. It is a schematic sectional drawing which shows the mode of application | coating of the phosphor ink in Embodiment 5. FIG. 10 is a diagram illustrating an example of an ink cross-linking formation method in a fifth embodiment. It is a figure which shows the mode of application | coating of the phosphor ink in Embodiment 6. FIG. It is explanatory drawing of the formation method of the partition by a thermal spraying method. It is explanatory drawing about plasma spraying. FIG. 10 is a schematic configuration diagram of an ink coating apparatus according to a seventh embodiment. It is the schematic diagram which shows the drying process of the fluorescent substance ink with which the recessed part was filled with the manufacturing method of Embodiment 8, and its comparison figure. It is a figure which shows the mode of fluorescent substance ink application | coating in Embodiment 9. FIG. It is sectional drawing which shows the outline of the ink coating device of Embodiment 10. FIG. It is a principal part schematic of the phosphor ink coating device in Embodiment 11. FIG. 38 is a diagram showing a modified example of the nozzle in the eleventh embodiment. FIG. 38 is a diagram showing a modified example of the nozzle in the eleventh embodiment. FIG. 38 is a diagram showing a modified example of the nozzle in the eleventh embodiment. FIG. 20 is a schematic sectional view of a PDP according to a twelfth embodiment. It is a figure which shows a mode that the fluorescent substance paste is apply | coated to the recessed part between partition walls by the conventional screen printing method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Front glass substrate 12 Discharge electrode 13 Dielectric glass layer 14 Protective layer 15 Back glass substrate 16 Address electrode 17 Partition 18 Phosphor layer 19 Discharge space 20 Ink application device 21 Server 22 Pressure pump 23 Header 24 Nozzle 33 Header 33a Ink chamber 33b Air chamber 34 Nozzle 36 Air injection nozzle 43 Header 44 Nozzle 46 Ink stirring rod 90 Plasma spraying device 100 Ink coating device 110 Water repellent film 120 Ink coating device 122 Nozzle 124-127 Nozzle 130 Reflective layer 170 Concave portion 170a Concave bottom surface 170b Concave portion Side of

Claims (3)

A first plate creating step for creating a first plate having a recess formed between the partition walls;
A phosphor layer forming step of forming a phosphor layer by applying a phosphor to the concave portion of the first plate;
A method of manufacturing a plasma display panel, comprising: a sealing step of sealing a gas medium while overlapping and sealing a second plate on a side of the first plate where the partition wall is formed,
The first plate making step includes
A method of manufacturing a plasma display panel, comprising a water repellent film forming step of forming a water repellent film containing a water repellent material on the upper surface of the partition wall. In the water repellent film forming step,
The method for manufacturing a plasma display according to claim 1, wherein the water-repellent film is formed by applying a molten fluororesin on the upper surface of the partition wall. A first plate on which a phosphor layer is formed by applying a phosphor to a recess between the partition wall and the partition wall after a water repellent film made of a water repellent material is formed on the top surface of the partition wall;
A second plate overlaid on the side of the first plate on which the partition wall is disposed,
A plasma display panel sealed with a gas medium sealed therein.

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