JP3220065B2 - Method of forming phosphor layer of plasma display panel and method of manufacturing plasma display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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.

[0002]

2. Description of the Related Art In recent years, expectations for high-definition and large-screen televisions such as high-definition televisions have been increasing.
In the field of displays such as CRTs, liquid crystal displays (LCDs), and plasma display panels (PDPs), the development of displays suitable for them is underway.

Conventionally, CRTs, which have been widely used as television displays, are excellent in resolution and image quality, but have a large screen of 40 inches or more in that the depth and weight increase with the screen size. Is not suitable. In addition, LCDs have excellent performance such as low power consumption and low driving voltage, but have technical difficulties in producing a large screen and have a limited viewing angle.

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 disposed on a surface thereof and a back plate, which are disposed in parallel with electrodes facing each other. A gap between the two plates is partitioned by a partition wall. The structure is such that red, green, and blue phosphor layers are formed in the grooves and a discharge gas is filled therein. The manufacturing is performed by forming the phosphor layers in the grooves of the back plate provided with the partition walls, and further forming The discharge gas is sealed by superposing a front cover plate on the front cover plate. The driving circuit applies the voltage to the electrodes to drive the electrodes.

The principle of light emission of a PDP is basically the same as that of a fluorescent lamp. When a driving circuit applies a voltage to an electrode and discharges, ultraviolet rays are emitted from a discharge gas, and phosphor particles (red, green, Blue) is excited by this ultraviolet light and emits light.
Since the conversion efficiency of the discharge energy into ultraviolet light and the conversion efficiency of the phosphor into visible light are low, it is difficult to obtain a high luminance like a fluorescent lamp.

A PDP is a direct current type (DC) depending on a driving method.
Type) and AC type (AC type). In the DC type, the electrode is exposed to the discharge space, whereas in the AC type, a dielectric glass layer is provided on the electrode. Also, there is a difference in the shape of the partition walls. In general, the partition walls are arranged in a stripe pattern in the AC type, whereas the partition walls are arranged in a grid pattern in the DC type. In this respect, the AC type is more suitable for forming a panel having a fine cell structure.

By the way, as the demand for higher-quality displays increases, PDPs having a fine cell structure are also 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 × 11
25, and the cell pitch in the 42-inch class is 0.1
5mm x 0.48mm, cell area is 0.072mm
It becomes the fineness of ² .

[0008] In order to put a PDP having such a detailed cell structure into practical use, it is necessary to increase the luminous efficiency of the cell as compared with the prior art.

[0009]

Under such a background, there are the following problems regarding the formation of the phosphor layer.
As a method of forming the phosphor layer, a method of filling a phosphor paste into the recesses between the partition walls by a screen printing method and firing it as shown in FIG. 25 is often used. On the other hand, the screen printing method is difficult to apply.

That is, the cell pitch is 0.1 to 0.15 mm
In this case, the groove width between the partition walls is very narrow, about 0.08 to 0.1 mm. However, since the phosphor ink used in screen printing has a high viscosity (typically, tens of thousands of centipoise), the width between the narrow partition walls is small. It is difficult to pour the phosphor ink accurately and at high speed. It is also difficult to produce a screen plate having a fine structure.

Further, in order to obtain a PDP with high luminous efficiency, a structure is adopted in which a phosphor layer is provided not only on the surface of the back plate but also on the side surfaces of the partition walls and a discharge space is secured. It can be said that it is desirable. In order to form a phosphor layer having such a desirable shape by a screen printing method, an appropriate amount of the phosphor paste is applied to the surface of the plate and the side surfaces of the partition walls by adjusting printing conditions such as the viscosity of the phosphor paste. It is necessary to adhere the phosphor paste, but it is difficult to adjust the printing conditions to suitable ones. In practice, there is a problem that the phosphor paste does not easily adhere to the side surfaces of the partition walls.

As a method of forming a phosphor layer other than the screen printing method, a photoresist film method and an ink jet method are also known. The photoresist film method, as disclosed in JP-A-6-273925, embeds a film of an ultraviolet-sensitive resin containing a phosphor of each color between barrier ribs to form a phosphor layer of a corresponding color. This is a method in which exposure and development are performed only on a portion to be formed, and a portion that is not exposed is washed away. According to this method, a film can be embedded between partition walls with some accuracy even when the cell pitch is small. However, since it is necessary to sequentially perform film embedding, exposure development, and rinsing for each of the three colors, there is a problem that the manufacturing process is complicated and color mixing is likely to occur, and the phosphor is relatively expensive. Nevertheless, there is also a problem that it is difficult to recover the washed-out phosphor, which increases the cost.

On the other hand, the ink jet method is disclosed in
As disclosed in JP-A-79371 and JP-A-8-162019, the ink liquid composed of a phosphor and an organic binder is pressed and scanned while being ejected from a nozzle to insulate the ink liquid in a desired pattern. This is a method of adhering the ink on a substrate, and it is possible to apply the ink to concave portions between narrow partition walls with high accuracy.

However, in such a conventional ink jet method, since the ejected ink is intermittently attached as droplets, when the partition walls are arranged in a stripe pattern, the ink is fixed in the grooves between the partition walls. It is difficult to apply with a film thickness of Further, similarly to the screen printing method, there is a problem that the ink liquid is concentrated on the bottom surface of the concave portion and hardly adheres to the side surface.

By the way, in such a PDP, a technique is also known in which a reflective layer is first formed in a concave portion between partition walls, and a phosphor layer is formed on the reflective layer to improve panel luminance (for example, a technique for improving panel luminance). JP-A-4-332430
No.). As a method of forming the reflective layer, a method of forming the reflective layer by applying a paste containing a reflective material by a screen printing method, as in the case of the phosphor layer, is known. There is a problem that the reflective material paste is difficult to apply to a detailed cell structure, and is difficult to adhere to the side surface of the partition.

Further, regarding the formation of the phosphor layer and the reflection layer, there is a problem that the phosphor and the reflector material easily adhere to the upper surface of the partition. In this case, when the back plate and the front cover plate are sealed, the adhesion between the upper portion of the partition and the front cover plate is easily damaged. Further, in the PDP, there is a problem related to electrode formation.
That is, in the conventional PDP, the display electrodes and the address electrodes have a width of about 130 μm to 150 μm, and usually,
It is formed by a screen printing method. In the case of the pixel level of a high-definition television as described above, the electrode width is set to 70 μm.
m, and in the case of a high-definition 20-inch SXGA (1280 × 1024 pixels), the electrode width needs to be about 50 μm, so it is difficult to form electrodes by screen printing. is there.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to form a phosphor layer or a reflective layer easily and accurately even in the case of a fine cell structure. It is a first object of the present invention to provide a method of manufacturing a PDP capable of uniformly forming a phosphor layer and a reflective layer in a groove between them.
The purpose of. It is a second object of the present invention to provide a method of manufacturing a PDP in which a phosphor layer and a reflection layer can be easily formed on the side surfaces of the partition walls.

[0018]

[0019]

In order to achieve the above object, the present invention provides a method for forming a phosphor layer or a reflection layer in a groove between partitions in a plate in which the partitions are arranged in stripes. The nozzle was scanned along the partition while maintaining the state in which the groove between the nozzle and the nozzle were crosslinked by the surface tension of the ink.

[0020]

[0021]

[0022]

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 (Overall Configuration and Manufacturing Method of PDP) FIG. 1 is a schematic 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 formed by alternately arranging a large number of cells that emit red, green, and blue light.

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, an address electrode 16 and a partition wall 1 on a rear glass substrate 15.
7, the back panel on which the phosphor layer 18 is arranged is bonded to each other, and a discharge gas is sealed in a discharge space 19 formed between the front panel and the back panel. The driving circuit shown in FIG.
Is applied to the address electrode 16 and driven.

Although the discharge electrodes 12 are shown in cross section in FIG. 1 for convenience, in practice, the discharge electrodes 12 are shown in FIG.
Are arranged in a direction along the plane of the drawing. Production of front panel: The front panel is a front glass substrate 11
It is manufactured by forming a discharge electrode 12 thereon, covering it 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.
Although it can be formed by a conventional method of forming a silver paste for an electrode by screen printing and firing,
In the present embodiment, it is formed using an ink jet method as described later. The dielectric glass layer 13 is, for example, 70
Wt% lead oxide [PbO], 15 wt% boron oxide [B
₂ O ₃ ], a composition obtained by mixing 10% by weight of silicon oxide [SiO ₂ ] and 5% by weight of aluminum oxide with an organic binder [α-terpineol in which 10% of ethyl cellulose is dissolved] After coating by screen printing, baking at 520 ° C for 20 minutes gives a film thickness of about 3
It is formed to 0 μm.

The protective layer 14 is made of magnesium oxide (Mg)
O) and is formed to a thickness of 0.5 μm by, for example, a sputtering method. Fabrication of rear panel: Address electrodes 16 are formed on rear glass substrate 15 using an ink jet method in the same manner as discharge electrodes 12.

Next, after the glass material is repeatedly screen-printed, it is baked to form the partition walls 17.
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 the phosphor ink by a method of scanning while continuously ejecting the phosphor ink from the nozzles, and baking the phosphor ink.

In this embodiment, the height of the partition wall is set to 0.1 in accordance with a high-definition television of a 40-inch class.
~ 0.15mm, pitch of partition wall is 0.15 ~ 0.3mm
And Preparation of PDP by Panel Bonding: Next, the front panel and the rear panel thus prepared are bonded together using sealing glass, and a high vacuum (for example, 8 × 10 -7 Torr), and then a discharge gas (for example, an He-Xe-based or Ne-Xe-based inert gas) is filled at a predetermined pressure to discharge the P gas.
Prepare DP.

Next, a circuit block for driving the PDP is mounted as shown in FIG. 2 to manufacture a PDP display device. In this embodiment, the content of Xe in the discharge gas is set to 5% by volume or more, and the filling pressure is set to 500 to 800 Torr.
Set to the range. (Regarding Method of Forming Electrode and Phosphor 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.

[0031] As shown in FIG.
At 0, the electrode material ink or the phosphor ink is stored in the server 21, and the pressurizing pump 22 pressurizes this ink and supplies it to the header 23. In the header 23,
An ink chamber 23a and a nozzle 24 are provided, and the ink that has been pressurized and supplied to the ink chamber 23a
4 is continuously injected.

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 so that the phosphor particles of each color, silica, binder, solvent component, and the like have an appropriate viscosity.

As the phosphor particles constituting the phosphor ink, those generally used for a phosphor layer of PDP can be used. Specific examples thereof include: blue phosphor: BaMgAl ₁₀ O ₁₇ : Eu ²⁺ green phosphor: BaAl ₁₂ O ₁₉ : Mn or Zn ₂ S
iO ₄ : Mn Red phosphor: (Y _x Gd _{1 -x} ) BO ₃ : Eu ³⁺ or Y
BO ₃ : Eu ³⁺ can be mentioned.

In order to suppress clogging of the nozzle and precipitation of particles, the average particle diameter of silver particles and glass particles used in the electrode material ink and the phosphor particles used in the phosphor ink is 5 μm.
m or less. In order for the phosphor to obtain good luminous efficiency, the average particle diameter 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.

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

The diameter of the nozzle 24 is preferably not less than 45 μm and smaller than the groove width W between the partition walls 17 in order to prevent clogging of the nozzle. In the server 21, particles in the ink (electrode material, phosphor particles, etc.) do not settle.
The ink is stored while being mixed and stirred by a stirrer (not shown) installed in the server 21.

The pressure of the pressure pump 22 is adjusted so that the flow of the ink ejected from the nozzle 24 becomes a continuous flow. The header 23 scans the front glass substrate 11 or the rear 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 the present embodiment, but the glass substrate may be linearly driven with the header 23 fixed.

While scanning the header 23, ink is sprayed from the nozzles 24 so as to form a continuous ink flow 25 (jet line), so that the ink is uniformly applied in a line on the glass substrate. . In the ink application device 20, as shown in FIG.
It is also possible to adopt a configuration in which a plurality of nozzles are provided and scanning is performed while ejecting ink from each nozzle in parallel (in FIG. 4, the arrow A is the scanning direction). If a plurality of nozzles 24 are provided in this manner, a plurality of ink lines 25 can be applied by one operation.

As described above, the discharge electrode 12 is formed by applying the electrode material ink onto the front glass substrate 11 by using the ink applying device 20, and the rear glass substrate 15 is formed.
The address electrode 1 is formed by applying an electrode material ink on the top.
6 is formed. In addition, the discharge electrode 1 thus formed is
2 and the address electrode 16 are fired together when the dielectric glass layer 13 and the partition 17 are fired.

On the other hand, the application of the phosphor ink by the ink applying device 20 is performed on the rear glass substrate 15 along the partition walls 17 for each of red, blue, and green. Then, red, green, and blue phosphor inks are sequentially applied to predetermined grooves and dried.
By sintering the panel (at about 500 ° C. for 10 minutes), the phosphor layer 18 is formed. As described above, the phosphor layer 18 is formed by applying ink continuously instead of being applied as ink droplets as in the conventional ink jet method. Is uniform.

In such an ink applying apparatus, three ink chambers of red, blue, and green and nozzles of each color are provided in one header, and three color phosphor inks are ejected in parallel. In this case, the phosphor inks of three colors can be applied in one scan. [Embodiment 2] The structure and manufacturing method of a PDP of this embodiment are the same as those of Embodiment 1, but there are some differences in the method of forming a 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 application device used when forming the phosphor layer 18 in the present embodiment. FIG. 6 is a partially enlarged perspective view showing the coating operation.
The ink application device 20 is also the same as the device used in the first embodiment, and the server 21 stores the phosphor ink, and the pressure pump 22 presses the phosphor ink to pressurize the phosphor ink. 23. The header 23 is provided with an ink chamber 23a and a plurality of nozzles 24. The phosphor ink supplied under pressure is supplied to the ink chamber 23a.
From the nozzles 24 and are continuously jetted.

However, the ink application device 20 of the present embodiment
In FIG. 7, the ejection direction of each nozzle 24 is not perpendicular to the rear glass substrate 15 but is inclined toward one of the partition walls as shown in FIGS. Is represented by θ). Due to this inclination, the ink flow 25 ejected from each nozzle 24 collides not with the center of the groove between the partitions but on the side surfaces of the partitions.

Therefore, the point that the phosphor ink is uniformly applied to the grooves between the partition walls of the rear glass substrate 15 is different from the first embodiment.
However, in the present embodiment, since the phosphor ink can be further applied to the upper part of the side surface of the partition wall 17,
The phosphor layer 18 having a larger light emitting area can be formed. Hereinafter, the ink coating device 2 will be described with reference to FIGS.
The operation and effect of 0 will be described more specifically.

In the ink application device 20, the header 23
Is provided for each color of red, blue, and green, and a header 2 of each color is provided.
3, the pitch of the nozzles 24 is set to be three times the cell pitch, and as shown in FIGS.
As the header 23 is scanned, every third groove is filled with the phosphor ink. After filling the predetermined groove with the phosphor ink while scanning the header 23 in the direction of arrow A in FIG. 4, the header 23 is rotated to rotate the end 23b and the end 2b.
3c, the groove filled with the phosphor ink is filled with the phosphor ink again while scanning in the direction of arrow A (or in the direction opposite to the direction of arrow A) again, whereby the side surfaces of both partition walls are obtained. Phosphor ink can be attached to the substrate.

FIG. 7 is a diagram for explaining the effect of the method of applying the phosphor ink of the present embodiment. In FIG. 7A, 2
4a represents the attitude of the nozzle 24 when scanning the header 23 for the first time, 25a represents the continuous ink flow formed in that attitude, and 24b represents the attitude of the nozzle 24 when scanning the header 23 again. 25b represents the ink flow continuously formed in the posture.

The ink streams 25a and 25b are
Since it is inclined by an angle θ from the direction perpendicular to the back glass substrate 15 to the direction of the right and left partitions, the ink flow 25
After a and 25b collide with the upper end of the side wall of each partition 17,
If it is made to flow to the bottom surface along the side surface, the phosphor ink can be attached to the upper portion of the side surface of each partition.
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 nozzle 24 is perpendicular to the rear glass substrate 15 at the center of the groove between the partition walls. In this case, the phosphor ink does not easily adhere to the side surfaces of the partition walls, 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 provided toward both side surfaces of the groove to which the ink is applied, and the phosphor ink is ejected in parallel from the two nozzles. Then, the phosphor ink can be applied to both side surfaces of the groove by one scanning.

[Embodiment 3] The overall structure and manufacturing method of the PDP of the present embodiment are the same as those of Embodiment 1, except that the method of applying the phosphor ink at the time of forming the phosphor layer is different. I have. FIG. 8 is a diagram for explaining a method of applying the phosphor ink in the present embodiment, and shows a cross section of the rear glass substrate 15 and the header of the ink application device along the partition wall 17. The arrow A in the figure indicates the scanning direction.

The ink applicator of this embodiment is the same as the ink applicator 20 of the first embodiment. However, as shown in FIG. 8, the header 33 includes an ink chamber 33a and a plurality of nozzles 34. , An air chamber 33b and a plurality of air injection nozzles 36, and compressed air is sent into the air chamber 33b from a compressor (not shown).

The air jet nozzles 36 are provided behind the respective nozzles 34 (on the rear side in the scanning direction of the header 33). By using the ink application device having such a configuration, the phosphor ink ejected from the nozzle 34 forms a continuous ink flow, is applied to the groove between the partition walls (see FIG. 9A), and immediately thereafter. Then, an air flow 37 jetted from the air jet nozzle 36 presses down the phosphor ink applied to the center of the groove (arrow 37a in FIG. 9B).
The air flow 37 flows along the liquid surface 38 of the phosphor ink (see the arrow 37b in FIG. 9B), and the phosphor ink is moved along the side surface of the partition wall 17 while being pushed away in the side direction of the partition wall 17. Let it stand up.

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

In the ink application apparatus of the present embodiment, if the heated compressed air is supplied to the air chamber 33b and the heated air is jetted from the air jet nozzle 36, the phosphor ink by the air flow is provided. And the amount of the phosphor adhering to the side surface of the partition wall increases. [Embodiment 4] This embodiment is the same as Embodiment 3, except that the phosphor ink applied to the grooves between the partitions is applied with an external force other than an air flow to form the partitions when the phosphor is formed. Stand on the side of.

In the header 43 shown in FIG. 10, an ink stirring rod 46 is provided immediately behind the nozzle 44. The arrow A in the figure indicates the scanning direction. When the 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 rises along this side surface, so that the phosphor ink 48 extends to the upper part of the side surface. Is attached.

The penetration depth of the rod 46 into the ink liquid level 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 walls. Although not described with reference to the drawings, after applying the phosphor ink to the grooves between the partition walls, instead of scanning the rod, a wire supported in the direction along the partition walls is inserted into the grooves, and the central portion of the groove is inserted. The same effect can be obtained by pushing away the phosphor ink filled in the partition wall and attaching it to the side surface of the partition wall.

In addition, after the phosphor ink has been applied to the grooves, the back glass substrate is vibrated so that the phosphor ink is raised on the side surfaces of the partition walls, or the back glass substrate is turned over and the fluorescent ink is turned over. A method in which the body ink flows along the side surface of the partition wall by gravity can be used, and the same effect can be expected. In the process of forming the phosphor layer described in Embodiments 2 to 4, if the process is performed while heating the rear glass substrate, the solvent component of the phosphor ink attached to the side surface of the partition wall is quickly evaporated and the ink flow is reduced. 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
It is desirable that the temperature be 200 ° C. or lower. [Embodiment 5] This embodiment is the same as Embodiment 1 except that the nozzles are scanned in a state where the phosphor ink is cross-linked when forming the phosphor layer.

FIG. 11 is a schematic sectional view showing the state of application of the phosphor ink in this embodiment. The configuration of the ink application device is the same as that of the ink application device 20 in FIG. 3, but the phosphor ink 50 ejected from the nozzle 24 during scanning moves between the inner surface of the groove between the partition walls of the back glass substrate 15. The scanning is performed while maintaining the state of being crosslinked by the surface tension.

In order to maintain the state in which the ink is crosslinked by the surface tension, it is necessary to appropriately maintain the distance between the nozzle 24 and the back plate, and this distance is usually set in the range of 5 μm to 1 mm. By doing so, a stable application can be obtained. The diameter of the nozzle 24 (nozzle diameter) has an optimum value depending on the interval between the partition walls and the ink discharge amount, but is preferably in the range of usually 45 to 150 μm.

When the nozzle is scanned while crosslinking the ink as described above, the phosphor ink discharged from the nozzle 24 is stably and continuously applied to the groove between the partition walls of the rear glass substrate 15 regardless of the scanning speed. be able to. That is, according to the present embodiment, since a continuous flow of ink can be formed even when the scanning speed is reduced, an expensive device for scanning at high speed is not required.

Accordingly, uniform coating can be realized with an inexpensive ink coating device. In addition, if the scanning is performed while forming the ink bridge between the nozzle and the side surface of the partition, the ink can be attached also to the upper part of the side surface of the partition. As the phosphor ink, the same ink as that described in the first embodiment may be used. However, when the ink is applied without being crosslinked, a high-viscosity phosphor ink or a phosphor ink having a large surface tension is used. Although it is difficult to form a continuous flow even if the ink is ejected from the nozzle, if it is applied in a state of forming a bridge as in the present embodiment, a relatively high-viscosity phosphor ink or a fluorescent ink having a large surface tension Even with body ink,
A continuous flow can be formed.

Accordingly, the restrictions on the viscosity and surface tension of the phosphor ink to be used are reduced, and the range of choice of the ink material can be said to be wider. In addition, the method of applying the phosphor ink while crosslinking it can also be performed using the header 23 having a plurality of nozzles 24 shown in FIG. Also, if one header is provided with three ink chambers of red, blue, and green and nozzles of each color so that three colors of phosphor ink are applied in parallel, three scans of three colors can be performed in one scan. A phosphor ink can also be applied.

By the way, in order to stably and continuously apply the phosphor ink, before ink application is started, a state is formed in which a gap between the nozzle tip and the groove of the back glass substrate 15 is cross-linked with the ink. It is desirable. The following method is considered as a method of forming the cross-link. Before scanning the nozzle, the nozzle is once stopped at an end of the rear glass substrate 15 and a certain amount of ink is ejected from the nozzle to form a bridge between the nozzle tip and the rear glass substrate 15.

In a state where the distance between the tip of the nozzle and the rear glass substrate 15 is shorter than the distance at the time of scanning, crosslinking is performed. Thereafter, the coating is performed while being separated to the scanning distance. First, as shown in FIG.
The ink 60 is applied to the end 15c of the nozzle 5 in advance. For this application, a mechanism for applying the ink 60 to the end portion 15c may be separately provided in the ink application device. However, the nozzle 24 is positioned at the end portion 15c, and the ink is ejected from the nozzle so that the end portion 15c is ejected. The phosphor ink 60 can be applied to 15c. Alternatively, before attaching the rear glass substrate 15 to the ink application device, using another device or tool,
The ink 60 may be applied to the end 15c.

Next, the tip of the nozzle is brought into contact with the ink 60 to form a bridge. Subsequently, ink is ejected from the nozzles while the nozzles are being scanned to apply the ink. According to this method, the operation of forming and applying the crosslinks can be performed continuously. [Embodiment 6] Fig. 13 is a diagram showing a state of application of phosphor ink in this embodiment.

This embodiment is the same as the fifth embodiment, in which the phosphor ink is applied in a crosslinked state, but is applied in a state in which a nozzle is inserted in the groove between the partition walls. As described above, by scanning with the nozzle 24 inserted in the groove, the ink can be uniformly applied to the groove in a crosslinked state, as in the fifth embodiment. Further, the nozzle 24
Has a function of displacing the ink existing in the center of the groove and adhering the ink to the upper portion of the side surface of the partition, so that the phosphor layer is easily formed on the side surface of the partition.

The outer diameter of the nozzle 24 is, of course, smaller than the distance between the partition walls, but the depth of penetration of the nozzle 24 into the ink liquid level depends on the filling amount and physical properties of the phosphor ink or the phosphor. It is appropriately adjusted according to the wettability between the ink and the partition walls. [Embodiment 7] The structure and manufacturing method of the PDP of this embodiment are the same as those of the PDP of Embodiment 1, but there are differences in the method of forming the partition walls 17 and the phosphor layers 18.

That is, in the present embodiment, the partition wall is formed such 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 concave portion (groove). The partition 17 is formed by selecting a material. By making such an adjustment, the phosphor ink easily adheres to the side surface of the partition wall 17. The partition wall 17 can be formed 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 of forming a partition 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 dry film 81
Is covered with a photomask 82, and only portions where partition walls are to be formed are irradiated with ultraviolet light (UV) (FIG. 14C), and development is performed to remove the dry film 81 where partition walls are to be formed. Then, a mask of the dry film 81 is formed only in a portion where the partition is not formed (D in FIG. 14).
reference). The development is performed in a 1% aqueous alkaline solution (specifically, a sodium carbonate aqueous solution).

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

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, a portion 8 of the raw material film 84 formed on the mask of the dry film 81 is formed.
4b is removed and the portion 84 directly formed on the substrate 15 is removed.
Only a remains, and this becomes the partition wall 17 (FIG. 14F).

As described above, the partition wall 17 is formed from a mixture of alumina and glass so that the contact angle of the phosphor ink with respect to the substrate 15 is smaller than the contact angle with respect to the substrate 15, thereby forming the partition wall side surface 170 b (FIG. 17). A), the adsorption force of the phosphor ink on the bottom surface 17 of the concave portion.
0a (see FIG. 17A) can be made larger than the adsorption force to the phosphor ink. In addition, even if alumina, zirconia, or a mixture of zirconia and glass is used as the material of the partition walls, the adsorptivity to the phosphor ink can be similarly adjusted.

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

As the phosphor ink to be used, the same ink as described in the first embodiment may be used, but it is preferable that the composition be such that it easily adheres to the side surface 170b of the concave portion. .1 to 1
0% by weight, and terpineol (C ₁₀ H
_{Using 18} O) gives relatively good results. In addition, examples of the solvent used include an organic solvent such as diethylene glycol methyl ether and water, and examples of the binder include a polymer such as PMMA and polyvinyl alcohol.

The diameter of the nozzle 24 is determined by the groove width W between the partition walls 17.
It is usually set to 150 μm or less, and is set to 45 μm or more in order to prevent nozzle clogging. Using the ink coating device 100, the phosphor ink is applied while crosslinking the phosphor ink between the nozzle 24 and the inner surface of the recess 170 as described below. First, the header 10
3 at the end of the back glass substrate 15 and the nozzle 24
By bringing the inner surface of the concave portion 170 of the rear glass substrate 15 into close proximity or contact, and discharging a small amount of the phosphor ink from the nozzle 24, a cross-link is formed by the surface tension of the phosphor ink.

Subsequently, the phosphor ink is applied to the concave portion 170 of the rear glass substrate 15 by operating the pressure pump 22 and continuously discharging the phosphor ink from the nozzle 24 while scanning the header 103. . At this time, the distance between the nozzle 24 and the bottom surface 170a is kept small (usually 1 mm or less), and the crosslinking by 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 scanning.

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

In this embodiment, scanning is performed at a slow speed of about several tens of mm / s, and the discharge amount is reduced by setting the pressure of the pressure pump 22 to a small value. Is formed, the phosphor ink can be uniformly applied to the concave portion 170 to form a uniform phosphor layer. In addition, in order to attach a large amount of the phosphor ink to the side surface 170 b of the recess 170, the amount of the phosphor ink filled into the recess 170 is 80 times the space volume of the recess 170.
%, And the content of the phosphor in the phosphor ink is desirably set in the range of 20 to 60% by weight.

(Explanation of Effect) FIG. 17A is a schematic diagram showing a drying process of the phosphor ink filled in the concave portion when the adsorbing force of the partition wall to the ink is adjusted as in the present embodiment. . In the present embodiment, the recess 170
Since the suction force of the side surface 170b for the phosphor ink is larger than the suction force of the bottom surface 170a for the phosphor ink, the phosphor ink does not fall toward the bottom surface 170a during drying, and the Also remain attached.

Further, as shown in this figure, when the phosphor ink is filled so as to occupy 80% or more of the space volume of the concave portion 170, the effect of attaching the phosphor ink to the side surface 170b is remarkable. On the other hand, FIG. 17B is a schematic diagram showing a drying process of the phosphor ink when the suction force on the phosphor ink on the side surface of the concave portion is smaller than the suction force on the phosphor ink on the bottom surface. In this case, as shown in the figure,
During the drying, the phosphor ink easily falls to the bottom surface and hardly remains on the side surface.

As described above, according to the PDP manufacturing method of the present embodiment, the phosphor layer can be formed uniformly along the partition walls, and the phosphor layer can be attached to the side surfaces of the concave portions. it can. Therefore, a PDP with high emission luminance can be manufactured. The material of the partition wall 17 is not limited to the above-mentioned material, and may be selected so that the contact angle of the phosphor ink with respect to the side surface of the partition wall 17 is smaller than the contact angle with respect to the bottom surface of the concave portion. 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 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 the suction force of the side surface of the partition wall 17 with respect to the phosphor ink is attracted to the phosphor ink of the bottom surface of the concave portion. Although the adjustment was made to be smaller than the force, the attraction force to the phosphor ink is affected by not only the contact angle of the phosphor ink with the surface but also the surface roughness. That is, the greater the surface roughness, the greater the adsorption power 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 reducing the surface roughness by polishing the surface of the substrate 15 in advance, or by plasma spraying conditions (for example, when forming the partition wall by the thermal spraying method).
Argon gas flow rate and applied voltage) are adjusted to increase the surface roughness, and when forming the partition by screen printing, it is possible to lower the firing temperature and increase the surface roughness. it can.

Further, if the contact angle of the phosphor ink with respect to the side surface of the concave portion is 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 larger than the surface roughness of the bottom surface, the effect is further improved. It will be noticeable. Note that, in the present embodiment, the case where the phosphor ink is applied from the nozzle while being cross-linked has been described. However, the present invention can be similarly applied to other application methods. For example, even when a normal ink jet method or a screen printing method is used, the same effect can be obtained by making the suction force on the phosphor ink on the side surface of the concave portion larger than the suction force on the phosphor ink on the bottom surface.

[Eighth Embodiment] The method of manufacturing a PDP according to the present embodiment is the same as that of the seventh embodiment. However, in the seventh embodiment, the concave portions of the phosphor ink are formed by selecting the material of the partition walls. Although the contact angle with respect to the side surface of the recess is larger than the contact angle with respect to the bottom surface of the recess, in the present embodiment, the phosphor ink is formed by forming a coating that increases the contact angle with respect to the bottom surface of the recess. Is adjusted to be larger than the contact angle with respect to the bottom surface of the concave portion.

The formation of the coating on the bottom surface of the concave portion is as follows.
For example, a fluororesin such as polytetrafluoroethylene is melted at a high temperature on the surface of the rear glass substrate 15 and applied by spin coating to form the address electrodes 16 and the partition walls 17 on the rear glass substrate 15. It can be carried out. And after forming such a coating,
When the recess is filled with the phosphor ink in the same manner as in the seventh embodiment, the contact angle of the phosphor ink with respect to the side surface of the recess is larger than the contact angle with respect to the bottom surface, and as shown in FIG. A lot of phosphor ink adheres to the surface.

By firing this, a good phosphor layer is formed on the bottom and side surfaces of the concave portion. In the case where the above-mentioned film is formed of an organic compound such as a fluororesin, the film is burned off when the phosphor layer is fired, and thus no film remains on the completed PDP. Note that, 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 by making the contact angle of the concave portion of the phosphor paste to the side surface smaller than the contact angle to the bottom surface.

[Embodiment 9] FIG. 18 is a diagram showing a state of applying phosphor ink in this embodiment. The method of manufacturing a PDP according to the present embodiment is the same as the method of manufacturing the PDP according to the seventh embodiment.
The difference is that, after the formation of 7, the adsorbing property of the upper surface of the partition wall 17 to the phosphor ink is made smaller than the adsorbing property of the side surface of the partition wall 17 to the phosphor ink, and then the phosphor ink is applied.

As shown in FIG. 18, as a method for making the upper surface of the partition wall 17 have a higher adsorbability to the phosphor ink than the side surface of the partition wall 17 has an adsorbability to the phosphor ink, as shown in FIG.
A method of forming a water-repellent film 110 made of a water-repellent material on the upper surface of the partition wall 17 can be used. This water-repellent film 110
Can be formed by applying a fluororesin such as polytetrafluoroethylene on the upper surface of the partition wall 17.

Specifically, in the step of forming the partition wall by the thermal spraying method described in the seventh embodiment, after forming the partition wall material film 84 on the substrate 15 (state of FIG. 14E), the mask of the dry film 81 is formed. If the molten fluororesin is applied by a spin coating method before the removal, the water-repellent film 110 made of the fluororesin can be formed on the upper surface of the partition wall 17.

As described above, 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 the phosphor ink is applied. . Therefore, when the front panel and the rear panel are attached to each other and sealed with the sealing glass, the problem that the sealing is hindered by the phosphor attached 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 fired, it does not remain in the manufactured PDP.

In addition, as a method of reducing the attraction force of the upper surface of the partition wall 17 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 is also available. Can be mentioned.
In this embodiment, the case where the phosphor is applied by the ink jet method has been described. However, the method of applying the phosphor is not limited to this, and another method can be applied. For example, even in the case of applying by a screen printing method, the same effect can be obtained if the attraction force of the upper surface of the partition against the phosphor paste is made smaller than the attraction force to the phosphor paste on the side surface.

[Embodiment 10] This embodiment is basically the same as Embodiment 5 described above, except that the outer diameter of the nozzle is set larger than the groove width between the partition walls. FIG.
1 is a cross-sectional view schematically showing an ink application device according to the present embodiment. In the ink application device 120, the phosphor ink is put in the server 121, and the ink is mixed and stirred inside so that the precipitation of the phosphor particles does not occur. And the server 12
The phosphor ink in 1 is discharged from the nozzle 122 when pressurized by pressurizing means (not shown).

Further, the server 121 can be scanned by the scanning mechanism (not shown) along the partition 17 on the rear glass substrate 15 in the front-back direction of FIG.
At the time of scanning, scanning is performed while maintaining a state in which the phosphor ink 123 discharged from the nozzle 122 is bridged by the surface tension between the phosphor glass 123 and the inner surface of the groove between the partition walls of the rear glass substrate 15.

The outer diameter of the nozzle 122 is set to be larger than the interval between the partition walls 17 and not to protrude to the adjacent groove. In this case, since the distance between the partition 17 and the nozzle 122 is relatively short, the phosphor ink is easily crosslinked, and furthermore, the tip of the nozzle and the top of the partition are in contact with each other during application due to the deflection of the rear glass substrate 15 or the like. However, the discharge port of the nozzle 122 does not block.

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 1
mm or less. [Embodiment 11] This embodiment is the same as Embodiment 5 except for the shape of the tip of the nozzle.

FIG. 20 is a schematic view of a main part of a phosphor ink applying apparatus according to the present embodiment. In the nozzle 24 according to the fifth embodiment, the opening edge at the tip is parallel to the surface of the rear glass substrate 15, whereas the nozzle 1 according to the fifth embodiment
In 24, the opening edge of the tip is inclined with respect to the surface of the rear glass substrate 15. Even when such a nozzle 124 is used, the ink can be uniformly applied to the groove in a crosslinked state as in the fifth embodiment.

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 out the ink existing at the center of the groove, so that the ink easily adheres to the side surface of the groove.

Since the opening face of the tip of the nozzle 124 is inclined, even if the tip of the nozzle and the back glass substrate come into contact with each other during the application due to the deflection of the back glass substrate 15 or the like, the discharge port of the nozzle 124 is not discharged. The ink can be stably applied continuously without blocking. The inclination angle of the opening surface of the nozzle 124 with respect to the surface of the rear glass substrate is 10 ° to 90 °.
It is good to be in the range of.

Although the nozzle 124 in FIG. 20 has an inclined opening surface at the tip, at least a part of the opening edge is more distant from the glass substrate than the tip of the opening edge. If it is formed in a shape, the same effect can be obtained. For example, the following modifications can be given. As shown in a nozzle 125 in FIG. 21, the tip of the nozzle is opened in a stepwise manner.

A nozzle 126 shown in FIG. 22 is formed such that the opening surface 126a at the tip of the nozzle is inclined with respect to the surface of the rear glass substrate 15 by bending the middle of the nozzle. As in a nozzle 127 shown in FIG. 23, an opening surface 127a is formed in two directions at the tip of the nozzle, and each opening surface is inclined with respect to the surface 15a (15b) of the rear glass substrate 15. In FIG. 23, a solid line 15a indicates that the surface of the rear glass substrate 15 is in contact with the tip of the nozzle 127, and a dashed line 15b indicates that the surface is separated.

Even when such nozzles 125 to 127 are used, the opening surface does not close when the tip of the nozzle comes into contact with the surface of rear glass substrate 15, so that the nozzle is scanned while contacting the surface of rear glass substrate 15. However, it is possible to stably and continuously apply ink. [Embodiment 12] FIG. 24 shows a PD according to the present embodiment.
It is a schematic sectional drawing of P. The structure and manufacturing method of this PDP
This is the same as the PDP of the first embodiment (see FIG. 1), except that a reflection layer 130 is provided in a groove between the partition walls 17 and a phosphor layer 18 is provided on the reflection layer 130. . By disposing the reflective layer 130 in this manner, the luminance of the panel can be improved (10 to 20%).

Formation of Reflective Layer 130 and Phosphor Layer 18
Is formed by applying a reflector ink and a phosphor ink using an ink application device as shown in FIG. 3 of the first embodiment. Reflective ink is a mixture of reflective material, binder and solvent component,
As the reflective material, a white powder having a high reflectance such as titanium oxide or alumina can be used. In particular, titanium oxide having an average particle size of 5 μm or less is preferable.

In the reflective layer forming method of the present embodiment,
By applying the method of forming the phosphor layer described in the seventh and eighth embodiments to the formation of the reflective layer 130, the suction force of the side surface of the partition wall 17 against the reflective material ink is reduced. So as to be larger than the adsorbing force. That is, the material of the partition wall is selected such that the contact angle of the reflector ink on the side surface of the partition wall 17 is smaller than the contact angle of the reflector ink on the bottom surface of the concave portion, and the surface roughness of the side wall of the partition wall 17 is reduced. Or larger than the surface roughness.
As a result, as described with reference to FIG. 17A, the reflection material ink easily adheres to the side surface of the partition wall 17.
This contributes to an improvement in the brightness of the DP.

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 so that the reflector ink easily adheres to the side surface 170b of the concave portion. Also,
Other than these, preferred solvents include organic solvents such as diethylene glycol methyl ether and water, and examples of the binder include polymers such as PMMA and polyvinyl alcohol.

In order to make the thickness of the reflective layer uniform, the ink viscosity must be low (1 to 1000 centipoise at 25 ° C.).
Is desirable. 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 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 content of the reflective material in the range of 20 to 60% by weight.

[Embodiment 13] The configuration of a PDP of this embodiment is the same as that of the PDP of Embodiment 12, except that a reflective layer 130 is provided (see FIG. 24). The manufacturing method is basically the same as the method described in the twelfth embodiment. However, in this embodiment, the adsorbing property of the upper surface of the partition wall 17 to the reflective ink is determined. The difference is that it is smaller than.

As shown in FIG. 18 of the ninth embodiment, the adsorbability of the reflective ink is adjusted by forming a water-repellent film 110 made of a water-repellent material on the upper surface of the partition wall 17 so as to reflect light on the side surface of the partition wall. Than the contact angle of the ink
This can be achieved by increasing the contact angle with respect to the upper surface of the partition. Alternatively, it can be achieved by making the surface roughness of the upper surface of the partition smaller than the surface roughness of the side surface of the partition.

When the reflecting material ink is applied in this manner, the reflecting material ink hardly adheres to the upper surface of the partition, and even if it adheres, it moves toward the side surface of the partition during drying. Material ink hardly remains. Therefore, when the front panel and the rear panel are bonded to each other and sealed with the 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 structure of a PDP according to the present embodiment is the same as that of the PDP according to the twelfth embodiment, and a reflection layer 130 is provided (see FIG. 24).
The formation of the phosphor layer 18 is the same as that of the first embodiment shown in FIG.
Is formed by applying a reflective material ink and a phosphor ink using an ink application device as shown in (1).

In the present embodiment, the method of forming the phosphor layer described in the fifth embodiment is applied to the formation of the reflective layer 130, and the nozzles are scanned while the reflective ink is crosslinked by surface tension. Then, the coating is continuously applied between the partition walls, and then dried and fired to form the reflective layer 130. In order to maintain the crosslinked state of the reflective ink, the distance between the tip of the nozzle and the partition wall 17 during scanning is preferably set in the range of 0 μm to 1 mm.

According to this reflection layer forming method, the same effect as that described in the fifth embodiment can be obtained, that is, the reflection material ink can be uniformly applied with an inexpensive ink application device, and a wide range of viscosity and surface tension can be obtained. There is an effect that the reflection material ink can be used. Next, the reflection layer 130 thus formed is formed.
Then, a phosphor ink is applied in the same manner as in the fifth embodiment to form a phosphor layer 18.

The reflection layer 130 can also be formed by applying the method described in the sixth, tenth, and eleventh embodiments using the above-described reflection material ink. It works. (Other Matters) In Embodiments 1 to 14,
Although an AC type PDP has been described as an example, the present invention is not limited to the AC type, and the present invention can be similarly applied to a PDP in which barrier ribs are arranged in a stripe shape.

Also, in the seventh, eighth, ninth, twelfth,
The technique of adjusting the adhesion state of the ink by adjusting the attraction force of the partition wall and the bottom of the concave portion to the phosphor ink or the reflective material ink as in the case of 13 is also applicable to a DC type PDP in which the partition walls are arranged in a grid pattern. It can be applied and has the same effect.

[0115]

【Example】

(Examples 1 to 5) Examples 1 to 5 based on the first embodiment
Was produced. Table 1 lists the compositions and ink viscosities of the electrode material ink (Ag ink) and the phosphor ink used in Examples 1 to 5.

In Examples 1 to 5, the blue phosphor
Is BaMgAl_TenO₁₇: Eu²⁺, As a green phosphor, Z
n_TwoSiO_Four: Mn, (Y_xGd_1-x)
BO _Three: Eu³⁺Was used.

[0117]

[Table 1]

The composition of the glass used for the electrode material ink (silver ink) in the table was as follows: 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 ).
% By weight. The molecular weight of ethyl cellulose used as a binder was 200,000, and the molecular weight of acrylic resin was 10
It is ten thousand. In the first embodiment, a nozzle having a nozzle diameter of 50 μm is used, and the electrode material ink is discharged while scanning while keeping the distance between the nozzle tip and the rear glass substrate at 1 mm, and the electrode width is set to 60 μm.
The μm electrodes 12 and 16 were formed.

The interval (cell pitch) between the partition walls 17 is 0.15.
mm and the height was set to 0.15 mm. The discharge gas is
A neon (Ne) gas containing 10% xenon (Xe) gas was used, and the filling pressure was set to 500 Torr. Example 2
In No. 5, a nozzle having a nozzle diameter of 45 μm and an electrode width of 50 μm
The electrodes 12 and 16 were formed by the method described above, and the interval (cell pitch) between the partition walls 17 was set to 0.106 mm and the height was set to 0.10 mm.

As the discharge gas, neon (Ne) gas containing 20% xenon (Xe) gas was used, and the charging pressure was 600 T.
orr. The PDPs of Examples 1 to 5 were discharged at a discharge sustaining voltage of 150 V and a frequency of 30 KHz to measure the luminance. The conditions for measuring the luminance are the same in the following examples.

The wavelength of the ultraviolet ray was mainly the excitation wavelength of the Xe molecular beam centered at 173 nm. The measurement results of the luminance were as shown in Table 1.

[0122]

[Table 2]

Table 2 shows the composition of the electrode material ink (Ag ink) and the phosphor ink used in the following Examples 6 to 13, the ink viscosity, and the panel luminance measurement results. Also in Examples 6 to 13, the blue phosphor was BaMgA.
l ₁₀ O _17: Eu ^2+, as the green _phosphor, Zn ₂ SiO _4:
Mn, and (Y _x Gd _{1 -x} ) BO ₃ : Eu as a red phosphor
³⁺ was used.

(Example 6) Based on Embodiment 2, Table 2
No. The electrode material ink (A) having the composition and viscosity range shown in FIG.
g ink) and a phosphor ink. The discharge gas was a neon (Ne) gas containing 5% xenon (Xe) gas, and the filling 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 of a molecular beam of Xe centered at 173 nm.

(Example 7) Based on Embodiment 3, Table 2
No. The electrode material ink (A) having the composition and viscosity range shown in FIG.
g ink) and a phosphor ink. The discharge gas used was a neon (Ne) gas containing 6% xenon (Xe) gas, and the filling 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 of a molecular beam of Xe centered at 173 nm. (Embodiment 8) Based on Embodiment 5, No. 2 in Table 2 A PDP was manufactured using the electrode material ink (Ag ink) and the phosphor ink having the compositions shown in FIG.

When applying the phosphor ink, the viscosity of the phosphor ink is set to 10 to 1000 centipoise at 25 ° C., and a nozzle having a nozzle diameter of 80 μm is used.
When pressure was applied at / cm ² , the phosphor ink was ejected from the nozzle, and the phosphor ink was crosslinked between the tip of the nozzle 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 rear 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.

[0128] Under these conditions, the amount of ink discharged is small. Therefore, when the phosphor ink is discharged from the nozzles under the same discharge conditions as in the case where no crosslinking is formed, no continuous flow is formed. After applying each color phosphor ink, about 50
The phosphor layer was formed by firing at 0 ° C. for 10 minutes.

As the discharge gas, a neon (Ne) gas containing 5% xenon (Xe) gas was used, and the filling pressure was 600 To.
rr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength of a molecular beam of Xe centered at 173 nm. (Embodiment 9) On the basis of the sixth embodiment, as shown in FIG.
A PDP was produced using an electrode material ink (Ag ink) and a 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 rear 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 used is a neon (Ne) gas containing 10% xenon (Xe) gas, and the filling pressure is 500 Torr.
And

The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength of the Xe molecular beam centered at 173 nm. (Example 10) Based on Embodiment 7, N in Table 2
o. A PDP was manufactured using an electrode material ink (Ag ink) and a phosphor ink having the composition shown in FIG. PDP was manufactured.

The partition of the back panel is formed by using a mixture of alumina and glass, and has a pitch of 140 μm and a width of 30 μm.
m and height 120 μm. Side wall 170 of the formed partition wall
b and the contact angle of the phosphor ink with respect to the bottom surface 170a of the recess 170 were measured visually. In addition, the surface roughness is measured according to JIS
It was measured according to a standard surface roughness measuring method (ten-point average roughness).

The contact angle of the phosphor ink on the side surface 170b is about 8 °, the surface roughness of the side face 170b is about 5 μm, and the contact angle of the phosphor ink on the bottom face 170a is about 1 °.
At 3 °, the surface roughness of the bottom surface 170a was about 0.5 μm. The nozzle 44 has a nozzle diameter of 80 μm, and the distance between the nozzle tip and the bottom surface of the concave portion is 1 during scanning.
The phosphor ink was applied so as to fill about 90% of the space volume of the concave portion by setting the thickness to 00 μm and scanning at a speed of 50 mm / s while applying a pressure of 0.5 kgf / cm ² .

After filling and drying each color phosphor ink,
The phosphor layer was formed by baking at about 500 ° C. for 10 minutes. The cross-sectional shape of each color phosphor layer formed was
The average of the bottom surface of the recess was about 20μ
m, the average thickness on the side was about 25 μm, and it was confirmed that the phosphor layer was formed uniformly.

As the discharge gas, a neon (Ne) gas containing 5% xenon (Xe) gas was used, and the filling pressure was 800 To.
rr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength of a molecular beam of Xe centered at 173 nm. (Example 11) Based on Embodiment 9, N in Table 2
o. A PDP was produced using an electrode material ink (Ag ink) and a phosphor ink having the composition shown in FIG.

The partition of the back panel is formed using alumina, and has 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. The contact angle of the phosphor ink on the side surface of the formed partition wall was about 5 °. The contact angle of the phosphor ink to the water-repellent film on the upper surface of the partition is about 30.
°.

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

The cross-sectional shape of each color phosphor layer thus formed was measured by SEM.
As a result, it was confirmed that the phosphor layer was formed uniformly on the side surface as well as on the bottom surface of the concave portion with an average thickness of about 20 μm. In addition, usually, when such a relatively large diameter nozzle is used, the ink easily adheres to the upper part of the partition wall during ink injection, but in the present embodiment, the fluorescent substance does not adhere to the upper surface of the partition wall. Did not. This is presumably because the adsorbing power of the upper surface of the partition against the phosphor ink is smaller than that of the side surface of the partition, so that the ink attached to the upper surface of the partition moved to the side surface of the partition along with drying.

As the discharge gas, a neon (Ne) gas containing 5% xenon (Xe) gas was used.
rr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength of a molecular beam of Xe 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, the upper surface of the partition was polished to reduce the surface roughness (the surface roughness of the side surface of the partition was about 5 μm. Even when the surface roughness of the upper surface of the partition wall was about 0.5 μm), the phosphor layer could be uniformly applied to the concave portions without the fluorescent substance adhering to the upper surface of the partition wall.

(Example 12) Based on the tenth embodiment, the case of A PDP was produced 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 nozzle 122 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 has a shearing speed of 200 sec.
The viscosity at ^-1 was adjusted to 10 to 1000 centipoise and placed in the server 121. And 0.5 kgf / cm ²
Then, the phosphor ink 123 was discharged from the nozzle 122, and the phosphor ink 123 was crosslinked between the tip of the nozzle 122 and the partition wall 17 by surface tension. In this state, the back glass substrate 15 was moved at a speed of 50 mm / s and scanned, so that the phosphor ink could be continuously applied to the grooves between the partition walls.

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

The distance between the partition walls 17 was 110 μm,
24, the inner diameter was 60 μm, the outer diameter was 100 μm, the inclination of the opening surface of the nozzle 124 with respect to the surface of the rear glass substrate was 45 °, and the distance between the tip of the nozzle 124 and the surface of the rear glass substrate 15 was 20 μm. Thus, the phosphor ink could be continuously and stably applied to the groove between the partition walls.

As the discharge gas, a neon (Ne) gas containing 5% xenon (Xe) gas was used, and the filling pressure was 500 To.
rr. The panel luminance was as shown in Table 2, and the wavelength of the ultraviolet light was mainly the excitation wavelength of a molecular beam of Xe centered at 173 nm. In Table 3, the following Examples 14 to
The composition of the electrode material ink (Ag ink), the reflector ink, and the phosphor ink, the ink viscosity, and the panel luminance measurement result used in 17 are described.

[0145]

[Table 3]

In Examples 14 to 17, the blue phosphor
Is BaMgAl_TenO₁₇: Eu ²⁺, With green phosphor
And Zn_TwoSiO_Four: Mn, (Y_xG
d_1-x) BO_Three: Eu³⁺Was used. (Example 14) Based on the twelfth embodiment,
No. 14, an electrode material ink (Ag ink) having the composition shown in FIG.
Production of PDP using reflector ink and phosphor ink
went.

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. The reflective material ink has an average particle size of 3 μm as a reflective material.
Was used, the viscosity was adjusted to 50 centipoise at 25 ° C. using 45% by weight of titanium oxide, 1.8% by weight of ethyl cellulose as a binder, and 53.2% by weight of terpineol as a solvent.

The contact angle of the reflective ink with respect to the partition wall is about 8
°. Also, the bottom surface of the concave portion (back glass substrate 15)
Was about 13 °. The nozzle used had a nozzle diameter of 80 μm, and the distance between the tip of the nozzle and the back glass substrate 15 during scanning was set to 100 μm. 0.5
When pressure was applied at kgf / cm ² , the reflective material ink was ejected from the nozzle, and a crosslink was formed. In this state, by scanning the rear glass substrate in the direction of the partition walls, ink was continuously injected into the grooves between the partition walls, and the reflecting material ink was applied so as to fill about 90% of the space volume of the concave portions.

After drying the applied reflector ink, about 5
The reflective layer was formed by baking at 00 ° C. for 10 minutes. When the cross-sectional coating shape of the formed reflective layer was observed by SEM, it was confirmed that the reflective material was uniformly applied to a thickness of about 20 μm not only on the bottom surface of the groove but also on the side surface of the partition wall.

Then, a phosphor ink was applied on the reflective layer in the same manner as above to form a phosphor layer. The discharge gas was a neon (Ne) gas containing 5% xenon (Xe) gas, and the filling pressure was 500 Torr.
The panel luminance is as shown in Table 3, and the wavelength of the ultraviolet light is
The excitation wavelength was mainly the Xe molecular beam centered at 173 nm.

In this embodiment, the contact angle of the reflection material ink with respect to the partition wall was adjusted to be small. However, the surface roughness of the rear glass substrate 15 having a surface roughness of about 0.5 μm was about 5 μm. In the case where the reflective material ink was applied to the grooves between the partition walls by using the glass partition walls formed as described above, a uniform reflective layer having a thickness of 20 μm could also be formed on the side surfaces of the partition walls. .

(Embodiment 15) Based on Embodiment 13, the case of A PDP was produced 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 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.

The reflecting material ink has a particle size of 0.1 as a reflecting material.
Using 45% by weight of 5 μm alumina (Al ₂ O ₃ ), 1.0% by weight of polyvinyl alcohol as a binder, and 54% by weight of water as a solvent, the viscosity was adjusted to 100 centipoise at 25 ° C. The contact angle of the reflector ink to the side wall of the partition was about 5 °, and the contact angle of the reflector ink to the upper part of the partition was about 30 °.

The nozzle used had a nozzle diameter of 100 μm, and the distance between the nozzle tip and the partition wall during scanning was 10 μm.
It was set to 0 μm. When a pressure of 0.7 kgf / cm ² was applied by a pressurizer, the reflector ink was ejected 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 walls, so that the reflective ink is continuously injected into the grooves between the partition walls, and the reflective ink is about 90% of the volume of the grooves. Was applied so as to be filled.

After drying the applied reflector ink, about 5
The reflective layer was formed by baking at 00 ° C. for 10 minutes. When such a nozzle having a relatively large diameter is used, usually, ink tends to remain on the upper part of the partition wall during ink injection. However, after forming the reflective layer by the method of this embodiment, the cross-sectional coating shape is determined by SEM. Observation revealed that the reflective material did not adhere to the upper surface of the partition, and the inner surface of the groove had a thickness of about 20 μm.
It was confirmed that the composition was uniformly applied.

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

In the present embodiment, the contact angle of the reflective ink with respect to the partition wall was adjusted to be small. However, the surface roughness of the side surface of the glass partition wall was about 5 μm, and the surface roughness of the upper surface of the glass partition wall was about 0 μm. Similarly, when the reflective material ink was applied to the grooves between the partition walls and the reflective material 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. A PDP was produced 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. The distance between the tip of the nozzle and the top of the partition wall was set to 20 μm.

The reflecting material ink comprises 30-60% by weight of titanium oxide having an average particle size of 0.5-5 μm as a reflecting material, 0.1-10% by weight of ethyl cellulose as a binder,
Terpineol was used as a solvent at 30 to 60% by weight, and the viscosity was adjusted to 10 to 1000 centipoise at 25 ° C.
When a pressure of 0.5 kgf / cm ² is applied by the pressurizer, the reflective ink is discharged from the nozzle, and the tip of the nozzle and the partition wall 1 are pressed.
The reflector ink was crosslinked with the side surface of No. 7 by surface tension.

In this state, the rear glass substrate 15 is
By moving and scanning at a speed of m / s, the reflector ink could be continuously applied to the grooves between the partition walls.
After drying, the reflective layer was formed by baking at about 500 ° C. for 10 minutes. Then, on this reflective layer, a phosphor layer was formed in the same manner as in Example 10.

The discharge gas used was a neon (Ne) gas containing 5% xenon (Xe) gas, and was charged at a filling pressure of 500 To.
rr. The panel luminance was as shown in Table 3, and the wavelength of the ultraviolet light was mainly the excitation wavelength of the Xe molecular beam centered at 173 nm. (Example 17) Based on the fourteenth embodiment, No. An electrode material ink (Ag ink) having the composition shown in FIG.
A PDP was produced using a reflector ink and a phosphor ink.

The reflector ink used was the same as that in Example 16 described above, but was applied using a nozzle 124 (see FIG. 20) having an inclined opening surface similar to Example 13. That is, the distance between the partition walls 17 is 110 μm,
24, the inner diameter was 60 μm, the outer diameter was 100 μm, the inclination of the opening surface of the nozzle 124 with respect to the surface of the rear glass substrate was 45 °, and the distance between the tip of the nozzle 124 and the surface of the rear glass substrate 15 was 20 μm. As a result, the reflective material ink could be continuously and stably applied to the groove between the partition walls.

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

[0164]

As described above, according to the present invention, in the step of forming a phosphor layer or a reflection layer in a groove between partitions in a plate in which partitions are arranged in a stripe pattern, a phosphor ink or a reflection layer is formed. By applying phosphor ink or reflector ink by scanning the nozzles along the partition walls while discharging the material ink from the nozzles in a continuous flow, even in the case of a fine cell structure, In this case, the phosphor layer and the reflection layer can be formed with high accuracy, and when the partition walls are striped, the phosphor layer and the reflection layer can be uniformly formed in the grooves between the partition walls.

Here, if the nozzle is scanned along the partition walls while ejecting the phosphor ink with the nozzles facing the side surfaces of the partition walls, the phosphor layer and the reflection layer can be easily applied to the side surfaces of the partition walls. Can also be formed. Further, in the step of forming the phosphor layer, the phosphor ink is applied to the grooves between the partition walls, and then an external force is applied to the applied phosphor ink to adhere the phosphor ink to the side surfaces of the partition walls. The phosphor layer can be easily formed.

In addition, by scanning the nozzles along the partition walls while maintaining the state in which the grooves between the partition walls and the nozzles are crosslinked by the surface tension of the phosphor ink, even in the case of a fine cell structure, it can be easily and accurately performed. When it is possible to form a phosphor layer or a reflective layer, and the partition walls are striped,
The phosphor layer and the reflection layer can be uniformly formed in the groove between the partition walls, and the phosphor layer and the reflection layer can be easily formed on the side surface of the partition wall.

In the step of forming a plate in which a recess is formed between partition walls, the side of the recess is smaller than the bottom of the recess.
The phosphor layer or the reflection layer can be easily formed on the side face of the partition wall by forming the phosphor ink or the reflection material ink so as to have a large attraction force.
Further, in the step of forming a plate in which a concave portion is formed between the partition walls, the side surface is formed such that the adsorption force to the phosphor ink or the reflective material ink is larger than the upper surface of the partition wall, so that the phosphor layer or When forming the reflective layer,
It is possible to prevent the phosphor and the reflector from adhering to the upper surface of the partition.

In the step of arranging the electrodes on the plate in a stripe pattern, a method is used in which the ink containing the electrode material is ejected from the nozzles so as to form a continuous flow, and the ink is applied by scanning the nozzles. Accordingly, even in the case of a fine cell structure, display electrodes and address electrodes can be easily formed.

[Brief description of the drawings]

FIG. 1 shows an AC surface discharge type PD according to an embodiment of the present invention.
It is a schematic sectional drawing of P.

FIG. 2 is a schematic driving block diagram of a PDP according to one embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of an ink application device used in forming a discharge electrode, an address electrode, and a phosphor layer in the first embodiment.

FIG. 4 is a perspective view showing a filling operation using an example of the ink application device.

FIG. 5 is a schematic configuration diagram of an ink application device used when forming a phosphor layer in the second embodiment.

FIG. 6 is a partially enlarged perspective view showing the operation of the ink application device of FIG.

FIG. 7 is a diagram illustrating the effect of the method of applying phosphor ink in the second embodiment.

FIG. 8 is a diagram illustrating a method of applying a phosphor ink in a third embodiment.

FIG. 9 is a diagram illustrating a method of applying a phosphor ink in a third embodiment.

FIG. 10 is a diagram illustrating a method of applying a phosphor ink in a fourth embodiment.

FIG. 11 is a schematic sectional view showing a state of application of a phosphor ink in a fifth embodiment.

FIG. 12 is a diagram illustrating an example of a method for forming a crosslink of an ink according to the fifth embodiment.

FIG. 13 is a diagram showing a state of application of a phosphor ink in a sixth embodiment.

FIG. 14 is an explanatory diagram of a method of forming a partition by a thermal spraying method.

FIG. 15 is an explanatory diagram of plasma spraying.

FIG. 16 is a schematic configuration diagram of an ink application device according to a seventh embodiment.

FIG. 17 is a schematic diagram showing a drying process of a phosphor ink filled in a concave portion in the manufacturing method according to the eighth embodiment, and a comparison diagram thereof.

FIG. 18 is a diagram showing a state of applying phosphor ink in a ninth embodiment.

FIG. 19 is a sectional view schematically showing an ink application device according to a tenth embodiment.

FIG. 20 is a schematic diagram of a main part of a phosphor ink application device according to an eleventh embodiment.

FIG. 21 is a diagram showing a modified example of the nozzle according to the eleventh embodiment.

FIG. 22 is a diagram showing a modified example of the nozzle according to the eleventh embodiment.

FIG. 23 is a diagram showing a modified example of the nozzle according to the eleventh embodiment.

FIG. 24 is a schematic sectional view of a PDP according to a twelfth embodiment.

FIG. 25 is a view showing a state in which a phosphor paste is applied to a concave portion between partition walls by a 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 wall 18 Phosphor layer 19 Discharge space 20 Ink coating device 21 Server 22 Pressure pump 23 Header 24 Nozzle 33 Header 33a Ink chamber 33b Air chamber 34 Nozzle 36 Air jet 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 to 127 Nozzle 130 Reflective layer 170 Concave portion 170a Bottom surface of concave portion 170b concave portion Side of

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI H01J 11/02 H01J 11/02 B Z 17/02 17/02 17/04 17/04 (31) Priority claim number 9-151789 (32) Priority date June 10, 1997 (June 10, 1997) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. Hei 9-162254 (32) Priority Date June 19, 1997 (June 19, 1997) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-198347 (32) Priority date July 24, 1997 (July 24, 1997) (33) Priority claiming country Japan (JP) (72) Inventor Hiroyuki Kawamura 1006 Oazadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiroyuki Kado Osaka 1006 Kadoma, Kamon, Fumonma-shi Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-63-155527 (JP, A) JP-A-8-1620 19 (JP, A) JP-A-10-27543 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 9/227 H01J 9/02 H01J 9/20

Claims (29)

(57) [Claims] A first plate having partition walls arranged in a stripe pattern, wherein a groove between the partition walls and a nozzle are formed of a phosphor;
After forming a state of crosslinking by the surface tension of the ink, the nozzle and the nozzle are scanned along the partition while maintaining a state in which the groove and the nozzle between the partition and the nozzle are crosslinked by the surface tension of the phosphor ink. A method for forming a phosphor layer of a plasma display panel, comprising a phosphor layer forming step of forming a phosphor layer by applying a body ink . 2. A nozzle used in the fluorescent substance layer forming step, the outer diameter of the tip portion, a phosphor as claimed in claim 1, wherein a greater than the width of the groove between the barrier ribs The method of forming the layer. The method according to claim 3, wherein the phosphor layer forming step, the formation of the phosphor layer of the plasma display panel of claim 2, wherein the scanning the nozzle while keeping the distance between the nozzle tip and the partition wall top to 1mm or less Method. 4. A nozzle used in the fluorescent substance layer forming step, and carrying out the outer diameter of the distal end portion is smaller than the width of the groove, the scanning of the nozzle tip of the nozzle in the state of being inserted into the groove A method for forming a phosphor layer for a plasma display panel according to claim 1 . The method according to claim 5, wherein the phosphor layer forming step, a phosphor as claimed in claim 4, wherein the scanning is performed in the nozzle while keeping the bottom surface of the groove and the nozzle tip of the non-contact state The method of forming the layer. 6. The method according to claim 1, wherein in the step of forming the phosphor layer, the nozzle is scanned while maintaining an interval between the tip of the nozzle and the bottom of the groove at 5 μm to 1 mm.
1. Formation of a phosphor layer of the plasma display panel according to 1.
Method. 7. A nozzle used in the phosphor layer forming step, wherein an outer diameter of a tip portion is smaller than a width of the groove, and at least a part of an opening edge for discharging ink is more than a tip of the opening edge. also, the method of forming the phosphor layer of the plasma display panel of claim 1, wherein the a shape spaced from the glass substrate. Nozzle used in the method according to claim 8, wherein the phosphor layer formation step, a plasma according to claim 7, wherein the opening face for ejecting ink are formed to be inclined with respect to the surface of the first plate How to form the phosphor layer of the display panel
Law. 9. A nozzle used in the phosphor layer forming step, wherein an opening for discharging ink is inclined at an angle of 10 ° or more and less than 90 ° with respect to the surface of the first plate. A method for forming a phosphor layer according to claim 8 . The method according to claim 10, wherein the phosphor layer forming step, a plasma display according to any one of claims 7-9, characterized in that scanning the nozzle while keeping the distance between the bottom surface of the nozzle tip and the groove to 1mm or less Panel phosphor layer
Formation method. 11. The method according to claim 11, wherein the step of forming the phosphor layer comprises :
Claim 1, characterized in that it comprises a sub-step of bridging the first plate and the nozzle by the surface tension of the fluorescent substance ink
Of forming the phosphor layer of the plasma display panel described above
Law. 12. The fluorescent substance ink used in the phosphor layer forming step, the average particle size includes phosphor 0.5Myuemu～5.0Myuemu, 2
The method for forming a phosphor layer of a plasma display panel according to any one of claims 1 to 11 , wherein the viscosity at 5 ° C is 10 to 1000 centipoise . 13. The nozzle used in the phosphor layer forming step, wherein the nozzle has a diameter of 45 to 150 μm.
13. The method for forming a phosphor layer of a plasma display panel according to any one of 1 to 12 . The method according to claim 14, wherein the phosphor layer forming step, claim, characterized in that in parallel to the plurality of grooves from a plurality of nozzles for scanning while ejecting phosphor ink 1
14. The method for forming a phosphor layer of a plasma display panel according to any one of items 13 to 13 . The method according to claim 15, wherein the phosphor layer forming step, a plasma according to claim 14, wherein the scanning while ejecting a plurality of colors phosphor ink of in parallel on a plurality of grooves from a plurality of nozzles Display panel phosphor
The method of forming the layer. 16. The shape of the phosphor layer according to claim 1.
The partition of the first plate on which the phosphor layer is formed by the
On the side where Overlap and seal the second plate and enclose the gas medium
Having a filling step of
Display panel manufacturing method. 17. A method according to claim 1, wherein the partition walls are arranged in stripes.
The groove between the partition and the nozzle is reflected on the plate
After forming a state of cross-linking by the surface tension of the material ink, the nozzle and the nozzle are scanned along the partition while maintaining a state in which the groove and the nozzle between the partition and the nozzle are cross-linked by the surface tension of the reflective material ink. A reflecting layer forming step of applying a reflecting material ink to form a reflecting layer; a phosphor layer forming step of applying a phosphor ink to a groove between the partition walls to form a phosphor layer on the reflecting layer; A method of manufacturing a plasma display panel, comprising: sealing a second plate on a side of the first plate on which a partition wall is provided, and sealing and sealing a gas medium. 18. The method of manufacturing a plasma display panel according to claim 17 , wherein an outer diameter of a tip portion of said nozzle used in said reflection layer forming step is larger than a width of a groove between said partition walls. 19. The method of manufacturing a plasma display panel according to claim 18, wherein in the step of forming the reflective layer, the nozzle is scanned while keeping a distance between the tip of the nozzle and the top of the partition wall at 1 mm or less. 20. The nozzle used in the reflection layer forming step, wherein the outer diameter of the tip is smaller than the width of the groove, and the nozzle scans while the nozzle tip is inserted in the groove. Item 18. The method for manufacturing a plasma display panel according to Item 17 . 21. The method of manufacturing a plasma display panel according to claim 20 , wherein in the step of forming the reflective layer, the nozzle is scanned while keeping the tip of the nozzle and the bottom of the groove in a non-contact state. 22. The method according to claim 21, wherein in the step of forming the reflective layer, the nozzle is scanned while maintaining a distance between the tip of the nozzle and the bottom of the groove at 5 μm to 1 mm.
18. The method for manufacturing a plasma display panel according to item 17 . 23. The nozzle used in the reflection layer forming step, wherein the outer diameter of the tip is smaller than the width of the groove, and at least a part of the opening edge for discharging ink is larger than the tip of the opening edge. 18. The method of manufacturing a plasma display panel according to claim 17 , wherein the shape is separated from the glass substrate. 24. The nozzle used in the reflection layer forming step, claim 23 that is characterized in that an opening surface for ejecting ink are formed to be inclined with respect to the surface of the first plate
A manufacturing method of the plasma display panel according to the above. 25. The nozzle used in the reflection layer forming step, wherein an opening surface for discharging ink is inclined at an angle of 10 ° or more and less than 90 ° with respect to the surface of the first plate. Item 30. The method for manufacturing a plasma display panel according to item 24 . The method according to claim 26, wherein the reflective layer forming step, claim, characterized in that scanning the nozzle while keeping the distance between the bottom surface of the nozzle tips and grooves in 1mm or less 23-25
The method for manufacturing a plasma display panel according to any one of the above. 27. The reflecting layer forming step, wherein the nozzle is stationary with respect to the first plate.
Claim 1, characterized in that it comprises a sub-step of crosslinking at the surface tension of the reflection material ink and the first plate and the nozzle
8. The method for manufacturing a plasma display panel according to 7 . 28. A reflector ink used in the step of forming a reflector, comprising a reflector having an average particle size of 0.5 μm to 5.0 μm.
The method for manufacturing a plasma display panel according to any one of claims 17 to 27 , wherein the viscosity at 5 ° C is 10 to 1000 centipoise. The method according to claim 29, wherein the reflective layer forming step, claim, characterized in that scanning while ejecting reflective material ink in parallel to a plurality of grooves from a plurality of nozzles 1
29. The method for manufacturing a plasma display panel according to any one of 7 to 28 .