JP3219033B2 - Plasma display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel used for a display device or the like.
In particular, the present invention relates to a method for forming a phosphor layer of a plasma display panel.

[0002]

2. Description of the Related Art FIG. 15 is a schematic sectional view of an alternating current (AC) type plasma display panel. In FIG. 15, reference numeral 200 denotes a front cover plate (front glass substrate) on which a display electrode 201 is provided, on which a dielectric glass layer 202 and MgO have a crystal orientation of (11).
1) A magnesium oxide (MgO) dielectric protective layer 203 oriented on the surface is covered. Conventionally, for the MgO dielectric protective layer 204, a vacuum deposition method by electron beam heating using MgO as a raw material has been used (for example, see Japanese Patent Application Laid-Open No.
No. 342991).

Reference numeral 205 denotes a back glass substrate (back plate) on which address electrodes 206, partition walls 207, and phosphor layers 208 are provided.
Reference numeral 9 denotes a discharge space in which a discharge gas is sealed. Conventionally, this electrode layer (display electrode and address electrode) is mainly formed by a screen printing method, and the phosphor layer is formed by a screen printing method (for example, JP-A-8-162019) and an ink-jet method ( For example, JP-A-53-793
No. 71) and a photoresist film method (for example, JP-A-6-273925).

[0004] The luminance of a panel conventionally developed as a plasma display panel is 40 inches NTS.
C panel (640 x 480 cells, cell pitch 0.43 mm x 1.29 mm, cell area about 0.55 m
m ² ) was about 250 cd / m ² (for example, Functional Materials, February 1996, Vol. 16, No. 2, page 7).

[0005]

In recent years, expectations for high-definition, large-screen televisions including high-definition televisions have been increasing. CRTs are superior to plasma displays and liquid crystals in terms of resolution and image quality, but they are 40 and 40 in depth and weight.
Not suitable for large screens larger than inches. Liquid crystals have excellent features such as low power consumption and low driving voltage, but have limitations in screen size and viewing angle. On the other hand, a plasma display is capable of realizing a large screen, and a 40-inch class product has already been developed (for example, Functional Materials, February, 1996, Vol. 16, N.
o. 2, 7).

At present, the brightness of a plasma display that is commercialized is determined by the gas (He-Xe) sealed in the discharge space.
The brightness level is influenced by the intensity of ultraviolet rays emitted by the discharge of a system or a neon-Xe system gas). In particular, in the discharge by the He-Xe-based gas, vacuum ultraviolet rays having a wavelength of 147 nm (nanometer) due to the resonance line of Xe are emitted, and the red, green, and blue ultraviolet rays applied in the discharge cell mainly by the ultraviolet rays of this wavelength. The excited phosphor is excited to emit light (for example, Applied Physics Vol. 51, No. 3,
1982, pages 334 to 347, or Optical Technology Contact Vol. 34, no. 1, 1996,
25 pages, or NHK Technical Research Vol. 31, No. 1,
(Showa 54, p. 18).

The pixel level of the current 40 to 42 inch class plasma display is 640 × 48 pixels.
0 cells, cell pitch 0.43 mm × 1.29 mm, cell area 0.55 mm ² (for example, functional material 199
Vol. 16, No. 2, 7).

Further, the pixel level of a full-spec high-vision television which is expected in recent years is 192 pixels.
0 × 1125, the cell pitch is also 0.15 mm × 0.48 mm in the 42 inch class, and the area of one cell is 0.07.
Fineness of ² mm ² .

[0009] Therefore, as the definition of the plasma display advances, the cell pitch and the area per cell become smaller than those of the conventional NTSC. Therefore, a high-precision phosphor film forming technique for improving the luminance is desired. It is rare.

However, the phosphor coating by the screen printing method has a problem that when the partition walls are filled with the phosphor ink, the screen plate is deformed and the adjacent partition walls are filled with the phosphor ink to cause color mixing. Considering a fine cell, in the phosphor coating by the screen printing method, when the pitch of the partition walls is changed from 0.1 mm to 0.15 mm, since the partition walls have a width, the space filled with the phosphor is 0.1 mm. And a very narrow width of about 0.08 mm, and it becomes difficult to accurately and rapidly flow high-viscosity (tens of thousands of centipoise) phosphor ink by a printing method.

In a phosphor photo film method or a phosphor photo paste method using a phosphor and an ultraviolet-sensitive resin, the phosphor can be embedded in the partition wall with a certain degree of accuracy. There are problems such as the necessity of performing color repetition, color mixing due to undeveloped portions, and difficulty in recovering expensive phosphor materials.

As a phosphor coating method which can solve such problems, Japanese Patent Application Laid-Open No. 53-79371 and Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open No. -162019 discloses an ink jet method in which a desired pattern is drawn on a substrate by ejecting a phosphor ink from a pressurized nozzle.

In the ink jet method, a phosphor pattern is filled between partition walls by continuously discharging a phosphor ink from a nozzle and moving a substrate or a nozzle.

However, there is a problem that the phosphor ink is applied to a region where a phosphor film is not originally formed, such as an address electrode terminal portion.

When the substrate is moved with respect to the nozzle,
Until the substrate reaches a certain speed, inertial force acts on the phosphor ink filled between the partition walls, the phosphor ink overflows from the end of the partition wall, and enters the adjacent partition wall, causing color mixing. There are issues.

In view of the foregoing, it is an object of the present invention to provide a method of manufacturing a plasma display panel in which a phosphor layer can be formed accurately and inexpensively on a plasma display panel.

[0017]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a liquid crystal display device comprising: a partition provided on at least one of a front panel and a rear panel; A discharge space, a phosphor layer is provided in a space partitioned by two adjacent partitions, and the end of the partition is closed, and the height of the closed portion is higher than that of the partition. A plasma display panel having a low height, a method for forming a phosphor layer using the plasma display panel, and a method for manufacturing a plasma display panel are provided.

In forming the phosphor layer, the phosphor ink is preferably ejected from a plurality of nozzles.

Further, in the above configuration, it is preferable that the tip of the ink nozzle and the back plate (back glass substrate) are not in contact with each other.

[0020]

Embodiments of the present invention will be described below.

(Overall Configuration and Manufacturing Method of PDP) FIG.
1 is a schematic sectional view of a facing AC discharge type PDP according to an embodiment of the present invention. Although only one cell is shown in FIG. 2,
Many cells that emit red, green, and blue light are arranged and PD
P is configured.

This PDP has a discharge electrode (display electrode) 12, a dielectric glass layer 13
address electrodes 16, partition walls 17, phosphor layers 18 on a front panel on which a gO protective layer 14 is disposed, and on a rear glass substrate 15.
The discharge gas is sealed in the discharge space 19 formed between the rear panels provided with the, and is manufactured as described below.

Preparation of Front Panel: The front panel is formed by forming discharge electrodes (display electrodes) 12 on a front glass substrate 11,
It is fabricated by covering the surface with a lead-based dielectric glass layer 13 and further forming an MgO protective layer 14 on the surface of the dielectric glass layer 13.

In this embodiment, a discharge electrode (display electrode)
Reference numeral 12 denotes a silver electrode. The front glass substrate 1 is formed by screen printing a silver electrode ink containing an ultraviolet-sensitive resin.
After being uniformly coated on the substrate 1 and dried, it is formed by patterning by exposure and development and baking.

The composition of the dielectric glass layer 13 is 70% by weight of lead oxide [PbO], 15% by weight of boron oxide [B ₂ O ₃ ], and 15% by weight of silicon oxide [SiO ₂ ]. It is formed by screen printing and firing.

The MgO protective layer 14 is made of magnesium oxide [MgO] and is formed by a sputtering method.

Fabrication of back panel: The back panel has address electrodes 16 formed on a back glass substrate 15, glass partitions 17 are formed thereon at a predetermined pitch, and each space sandwiched by the partitions 17 is formed. Is formed by forming a phosphor layer 18 of a red phosphor, a green phosphor, and a blue phosphor.

In the present embodiment, the address electrode 16 is a silver electrode, and a silver electrode ink containing an ultraviolet-sensitive resin is uniformly applied on the rear glass substrate 15 by a screen printing method. After drying, patterning by exposure and development and baking are performed.

The partition 17 is formed by repeatedly printing several times by a screen printing method.

A phosphor layer 18 is formed by applying a red phosphor, a green phosphor, and a blue phosphor to each space sandwiched by the partition walls 17 by an ink discharge method. As the phosphor of each color, a phosphor generally used for a plasma display panel can be used. Here, the following phosphor is used.

Red phosphor: (Y _X Gd _{1 -X} ) BO ₃ : Eu
³⁺ or YBO ₃ : Eu ³⁺ green phosphor: BaAl ₁₂ O ₁₉ : Mn or Zn ₂ Si
O ₄ : Mn Blue phosphor: BaMgAl ₁₀ O ₁₇ : Emulsion of PDP by Eu ²⁺ panel bonding: Next, the front panel and the rear panel thus manufactured are bonded together using sealing glass, and partition walls are formed. After the inside of the discharge space 19 partitioned by 17 is evacuated to a high vacuum (8 × 10 ⁻⁷ Torr), a discharge gas of a predetermined composition is sealed at a predetermined pressure to produce a plasma display panel.

The composition of the discharge gas to be filled is a conventional Ne--Xe system, but the content of Xe is set to 5% by volume or more, and the filling pressure is 500 to 800 Torr.
Set to the range of r.

[0033]

【Example】

(Embodiment 1) Next, an embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 1 is a schematic view of a back panel used for explaining Embodiment 1 of the present invention.

As shown in the figure, the partition 21 is formed by repeating screen printing on the rear glass substrate 20 and then firing, and has one end that is alternately closed. Next, a method of forming a phosphor layer in each space partitioned by the partition 21 will be described with reference to FIG.

FIG. 3 is a schematic diagram of an ink discharge device used when forming a phosphor layer of a plasma display panel. In FIG. 3, reference numeral 22 denotes a phosphor ink, 23 denotes a nozzle for discharging the phosphor ink 22, and 24 denotes a phosphor ink 2.
A server for supplying 2 to the nozzle 23 and a pressurizer 25 for applying pressure to the nozzle 23.

First, an average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) ) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was stirred well, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is discharged into a space sandwiched by the partition walls 27 (21) formed in a stripe shape on the rear glass substrate 26, and at the same time, the rear glass substrate 26 is linearly aligned with the longitudinal direction of the partition walls 27. Move to form a blue phosphor line.

Subsequently, the red phosphor (Y _X Gd _{1 -X} ) B
A coating liquid comprising a phosphor mixture of O ₃ : Eu ³⁺ is applied to a nozzle 2
3 and the rear glass substrate 26 is simultaneously
The red phosphor line is formed by linearly moving in the direction of 7. Here, when the rear glass substrate 26 is moved linearly, the partition wall 2 is kept until the moving speed becomes constant.
An inertial force acts on the blue phosphor filled in the partition sandwiched by 7, and the blue phosphor leaks from the unclosed end of the partition 27. However, since the ends of the partition walls 27 are alternately closed, the blue phosphor does not leak between the adjacent partition walls, and no color mixing occurs.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the line of n, baking at 500 ℃ for 10 minutes,
A phosphor layer is formed.

Next, the back glass substrate 26 provided with the phosphor layer is bonded to the front glass substrate by using sealing glass, and the discharge space is set to 8 × 10 ⁻⁷ T before filling the discharge gas.
Evacuate to a vacuum of orr. Since only one end of the partition wall 27 is closed, the discharge space can be exhausted uniformly. After the discharge space was evacuated, helium (He) gas containing 10% xenon (Xe) gas was filled in the discharge space as a discharge gas at 500 Torr to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

In this embodiment, the height of the portion whose end is closed is the same as the height of the partition, but may be lower than the height of the partition.

(Example 2) In the same manner as in (Example 1),
The method for forming the phosphor layer will be described with reference to FIGS.

FIG. 3 is a schematic view of an ink discharging apparatus used when forming a phosphor layer of a plasma display panel. In FIG. 3, reference numeral 22 denotes a phosphor ink, 23 denotes a nozzle for discharging the phosphor ink 22, and 24 denotes a phosphor ink 22.
And a pressurizer 25 for applying pressure to the nozzle 23.

FIG. 4 is a schematic view of a back panel used for explaining the second embodiment. The partition wall 29 is formed on the rear glass substrate 28 by repeatedly performing screen printing and then firing. At both ends of the partition wall 29, a wall 30 of a heat sublimable resin is formed. First, a method of providing a wall made of the above-described heated sublimable resin will be described.

As the heat sublimable resin, isodecyl methacrylate (weight average molecular weight: 5700 ± 6000) powder 60% by weight, solvent (n-heptane: MIBK = 7:
1) A resin material dissolved at 40% by weight is prepared. This resin material is diluted with 80% by weight and a solvent (terpineol) at 20% by weight, and drawn on the end of the partition wall 29 with a dispenser to form the wall 30 of the heat sublimable resin. Partition wall 29
Are closed by a heat sublimable resin wall 30. Next, a method of forming a phosphor layer in each space partitioned by the partition wall 29 will be described with reference to FIGS.

First, an average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) ) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was stirred well, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is discharged between the partition walls 29 formed in a stripe shape on the rear glass substrate 28, and at the same time, the rear glass substrate 28 is linearly moved in accordance with the direction of the partition walls 29 to form a blue phosphor line. To form

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
A red phosphor line is formed by discharging the coating liquid composed of the Eu ³⁺ phosphor mixture from the nozzle 23 and simultaneously moving the rear glass substrate 28 linearly along the direction of the partition wall 29. Here, when the rear glass substrate 28 is moved linearly, inertial force acts on the blue phosphor filled between the partition walls 29 until the moving speed becomes constant, and the moving direction of the rear glass substrate 28 is changed. Flows in the opposite direction. However, since both ends of the partition wall 29 are closed by the wall 30 of the heat-sublimable resin, the blue phosphor between the partition walls 29 does not leak out of the partition wall 29, and no color mixing occurs in the adjacent partition wall.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the line of n, baking at 500 ℃ for 10 minutes,
A phosphor layer is formed.

FIG. 5 shows the thermal decomposition characteristics of the isodecyl methacrylate resin used in this example. The measurement is performed in air (50 ml / min) and in nitrogen (50 ml / min).
At a heating rate of 10 ° C./min. As a result of the thermal decomposition characteristics, it was found that when it was fired in air at 500 ° C. for 10 minutes, it was completely thermally decomposed. Further, actually, even in the panel manufactured by using this example, no outgassing defect caused by isodecyl methacrylate occurred.

Next, the back glass substrate provided with the phosphor layer is bonded to the front glass substrate using sealing glass, and the discharge space 19 is filled with 8 × 10 ⁻⁷ before filling the discharge gas.
Evacuate to Torr vacuum. As described above, the wall 30 of the heated sublimable resin is thermally decomposed and removed.
The discharge space can be exhausted uniformly. After evacuating the discharge space, the discharge space is filled with helium (He) gas containing 10% xenon (Xe) gas as a discharge gas to 500 To.
rr was sealed to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

Although isodecyl methacrylate is used as the sublimable resin in this embodiment, any resin that can be thermally decomposed at 400 ° C. or higher, such as an acrylic resin, can be used.

(Example 3) In the same manner as in (Example 1),
The method for forming the phosphor layer will be described with reference to FIGS. 3, 5, and 6. FIG.

FIG. 3 is a schematic diagram of an ink discharge device used when forming a phosphor layer of a plasma display panel. In FIG. 3, reference numeral 22 denotes a phosphor ink, 23 denotes a nozzle for discharging the phosphor ink 22, and 24 denotes a phosphor ink 22.
And a pressurizer 25 for applying pressure to the nozzle 23.

FIG. 6 is a schematic view of a back panel used for explaining the third embodiment. The partition walls 32 are formed on the rear glass substrate 31 by repeating screen printing and then firing. At both ends of the partition 32, an adhesive layer 33 of a heat sublimable resin is formed. First, a method of providing the adhesive layer 33 of the heat sublimable resin will be described.

As the heat sublimable resin, isodecyl methacrylate (weight average molecular weight: 5700 ± 6000) powder 60% by weight, solvent (n-heptane: MIBK = 7:
1) A resin material dissolved at 40% by weight is prepared. This resin material is diluted with 70% by weight and a solvent (terpineol) with 30% by weight, and drawn on the end of the partition wall 32 with a dispenser to form the heat-sublimable resin adhesive layer 33. Both ends of the partition 32 are surrounded by an adhesive layer 33 of a heat sublimable resin. Next, a method of forming a phosphor layer in each space partitioned by the partition 32 will be described with reference to FIGS.

First, the average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) ) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was stirred well, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is discharged between the partition walls 31 (27) formed in a stripe shape on the rear glass substrate 32 (26), and at the same time, the rear glass substrate 31 is linearly moved in accordance with the direction of the partition walls 32. Thus, a blue phosphor line is formed.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
A red phosphor line is formed by simultaneously ejecting the coating solution composed of the Eu ³⁺ phosphor mixture from the nozzle 23 and moving the rear glass substrate 31 linearly along the direction of the partition wall 32. Here, when the rear glass substrate 31 is moved linearly, an inertial force acts on the blue phosphor filled between the partition walls 32 until the moving speed becomes constant, and the moving direction of the rear glass substrate 31 is changed. Flows in the opposite direction. However, since the adhesive layer 33 of the heat sublimable resin is formed at both ends of the partition 32, the solvent component is absorbed by the heat sublimable adhesive layer 33 in the coating liquid of the blue phosphor leaked from the partition 32. As a result, fluidity is lost, so that there is no possibility of leakage into adjacent partition walls, and no color mixing occurs.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the line of n, baking at 500 ℃ for 10 minutes,
A phosphor layer is formed.

FIG. 5 shows the thermal decomposition characteristics of the isodecyl methacrylate resin used in this example. The measurement is performed in air (50 ml / min) and in nitrogen (50 ml / min).
At a heating rate of 10 ° C./min. As a result of the thermal decomposition characteristics, it was found that when it was fired in air at 500 ° C. for 10 minutes, it was completely thermally decomposed. Further, actually, even in the panel manufactured by using this example, no outgassing defect caused by isodecyl methacrylate occurred.

Next, the back glass substrate 31 provided with the phosphor layer is bonded to the front glass substrate using sealing glass, and the discharge space 19 is filled with 8 × 10
^{Evacuate to -7} Torr vacuum. As described above, since the adhesive layer 33 of the heated sublimable resin is thermally decomposed and removed, the discharge space can be uniformly exhausted. After exhausting the discharge space 19, 10% xenon (X
e) A helium (He) gas containing gas was sealed as a discharge gas at 500 Torr to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

Although isodecyl methacrylate is used as the sublimable resin in this embodiment, any resin that can be thermally decomposed at 400 ° C. or higher, such as an acrylic resin, can be used.

(Example 4) In the same manner as in (Example 1),
The method for forming the phosphor layer will be described with reference to FIGS.

FIG. 3 is a schematic diagram of an ink discharge device used when forming a phosphor layer of a plasma display panel. In FIG. 3, reference numeral 22 denotes a phosphor ink, 23 denotes a nozzle for discharging the phosphor ink 22, and 24 denotes a phosphor ink 22.
And a pressurizer 25 for applying pressure to the nozzle 23.

FIG. 7 is a schematic view of a back panel used for explaining the fourth embodiment. The partition wall 35 is formed on the rear glass substrate 34 by repeating screen printing and then firing. At both ends of the partition wall 35, a nonwoven fabric 36 is provided as a detachable porous member. Next, a method of forming a phosphor layer in each space partitioned by the partition wall 35 will be described with reference to FIGS.

First, the average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) ) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was stirred well, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is discharged between the partition walls 35 (27) formed in a stripe shape on the rear glass substrate 34 (26), and at the same time, the rear glass substrate 34 is linearly moved in accordance with the direction of the partition walls 35. Thus, a blue phosphor line is formed.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
The coating liquid comprising the Eu ³⁺ phosphor mixture is discharged from the nozzle 23, and at the same time, the rear glass substrate 34 is moved linearly along the direction of the partition wall 35 to form a red phosphor line. Here, when the rear glass substrate 34 is moved linearly, an inertial force acts on the blue phosphor filled between the partition walls 35 until the moving speed becomes constant, and the moving direction of the rear glass substrate 34 is changed. Flows in the opposite direction. However, since the nonwoven fabric 36 is disposed at both ends of the partition 35, the coating liquid of the blue phosphor leaked from the partition 35 absorbs the solvent component of the nonwoven fabric 36 and loses fluidity. There is no leakage and no color mixing occurs.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the line n, the nonwoven fabric 36 is removed and 500
Firing at 10 ° C. for 10 minutes to form a phosphor layer.

Next, the back glass substrate 34 provided with the phosphor layer is bonded to the front glass substrate using sealing glass, and the discharge space 19 is filled with 8 × 10 ⁻⁷ before filling the discharge gas.
Evacuate to Torr vacuum. As described above, since the nonwoven fabric 36 has been removed, the discharge space can be uniformly exhausted. After evacuating the discharge space 19, helium (He) containing 10% xenon (Xe) gas in the discharge space.
The gas was sealed as a discharge gas at 500 Torr to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

Although a nonwoven fabric is used as the detachable porous member in this embodiment, a sponge or the like can be used as long as it can absorb a solvent.

(Example 5) In the same manner as in (Example 1),
The method for forming the phosphor layer will be described with reference to FIGS.

FIG. 3 is a schematic view of an ink discharge device used when forming a phosphor layer of a plasma display panel. In FIG. 3, reference numeral 22 denotes a phosphor ink, 23 denotes a nozzle for discharging the phosphor ink 22, and 24 denotes a phosphor ink 22.
And a pressurizer 25 for applying pressure to the nozzle 23.

FIG. 8 is a schematic view of a back panel used for explaining the fifth embodiment. The partition wall 38 is formed on the rear glass substrate 37 by repeating screen printing and then firing. At both ends of the partition wall 38, nichrome wires 39 are provided as detachable heating members.

The nichrome wire 39 is set so that the surface temperature becomes 200 ° C., which is higher than the boiling point of the solvent (terpineol) of the phosphor mixture, by supplying power from a power supply controller (not shown). Next, a method for forming a phosphor layer in each space partitioned by the partition 38 will be described with reference to FIGS.

First, an average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) ) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was stirred well, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is discharged between the partition walls 38 (27) formed in a stripe shape on the rear glass substrate 37 (26), and at the same time, the rear glass substrate 37 is linearly moved in accordance with the direction of the partition walls 38. Thus, a blue phosphor line is formed.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
A red phosphor line is formed by simultaneously ejecting the coating liquid composed of the Eu ³⁺ phosphor mixture from the nozzle 23 and moving the rear glass substrate 37 linearly along the direction of the partition wall 38.

Here, when the rear glass substrate 37 is moved linearly, inertial force acts on the blue phosphor filled between the partition walls 38 until the moving speed becomes constant, and the rear glass substrate 37 It flows in the direction opposite to the direction of movement. However, since the nichrome wire 39 whose surface temperature is set to 200 ° C. is provided at both ends of the partition 38, the solvent component of the blue phosphor coating liquid leaking from the partition 38 when the nichrome wire 39 touches the nichrome wire 39. Since it loses its fluidity due to volatilization, it does not leak to the adjacent partition walls, and no color mixing occurs.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the line n, the nichrome line 39 is removed, and
Firing at 00 ° C. for 10 minutes forms a phosphor layer.

Next, the rear glass substrate 37 provided with the phosphor layer is bonded to the front glass substrate by using sealing glass, and the discharge space is set to 8 × 10 ⁻⁷ T before filling the discharge gas.
Evacuate to a vacuum of orr.

As described above, since the nichrome wire 39 has been removed, the discharge space can be uniformly exhausted. After the discharge space 19 was evacuated, the discharge space was filled with helium (He) gas containing 10% xenon (Xe) gas as a discharge gas at 500 Torr to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

In this embodiment, a nichrome wire is used as a detachable heating member. However, a ceramic surface heater, a silicon rubber surface heater, or the like can be used.

It is desirable that the surface temperature of the heating member is set in accordance with the boiling point of the solvent used in the phosphor mixture, and the surface temperature does not need to be 200 ° C.

(Example 6) In the same manner as in (Example 1),
The method for forming the phosphor layer will be described with reference to FIGS.

FIG. 3 is a schematic diagram of an ink discharge device used when forming a phosphor layer of a plasma display panel. In FIG. 3, reference numeral 22 denotes a phosphor ink, 23 denotes a nozzle for discharging the phosphor ink 22, and 24 denotes a phosphor ink 22.
And a pressurizer 25 for applying pressure to the nozzle 23.

FIG. 9 is a schematic view of a back panel used for explaining the sixth embodiment. The partition wall 41 is formed on the rear glass substrate 40 by repeating screen printing and then firing. At both ends of the partition wall 41, detachable suction nozzles 42 are provided. The suction nozzle 42 is connected to a vacuum pump (not shown). Next, a method of forming a phosphor layer in each space partitioned by the partition wall 41 will be described with reference to FIGS.

First, the average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) ) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was stirred well, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is discharged between the partition walls 41 (27) formed in a stripe shape on the rear glass substrate 40 (26), and at the same time, the rear glass substrate 40 is linearly moved in accordance with the direction of the partition walls 41. Thus, a blue phosphor line is formed.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
A red phosphor line is formed by simultaneously ejecting the coating liquid composed of the Eu ³⁺ phosphor mixture from the nozzle 23 and moving the rear glass substrate 40 linearly along the direction of the partition wall 41. Here, when the rear glass substrate 40 is moved linearly, inertial force acts on the blue phosphor filled between the partition walls 41 until the moving speed becomes constant, and the moving direction of the rear glass substrate 40 is changed. Flows in the opposite direction. However, since the suction nozzles 42 are disposed at both ends of the partition 41, the coating liquid of the blue phosphor leaked from the partition 41 is sucked by the suction nozzle 42 and does not leak to the adjacent partition. No color mixing occurs.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the n-th line, the suction nozzle 42 is removed and baked at 500 ° C. for 10 minutes to form a phosphor layer.

Next, the back glass substrate 40 provided with the phosphor layer is bonded to the front glass substrate using sealing glass, and the discharge space 19 is filled with 8 × 10 ⁻⁷ before filling the discharge gas.
Evacuate to Torr vacuum. As described above, since the suction nozzle 42 has been removed, the discharge space can be uniformly exhausted. After exhausting the discharge space 19, the discharge space is filled with helium (He) gas containing 10% xenon (Xe) gas as a discharge gas at 500 Torr,
An AC surface discharge plasma display was used.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

(Example 7) In the same manner as in (Example 1),
The method for forming the phosphor layer will be described with reference to FIGS.

FIG. 3 is a schematic view of an ink discharge device used when forming a phosphor layer of a plasma display panel. In FIG. 3, reference numeral 22 denotes a phosphor ink, 23 denotes a nozzle for discharging the phosphor ink 22, and 24 denotes a phosphor ink 22.
And a pressurizer 25 for applying pressure to the nozzle 23.

FIG. 10 is a schematic view of a back panel used for explaining the seventh embodiment. On the rear glass substrate 43,
The partition 44 is formed by repeating screen printing and then firing. Both ends of the partition 44 are connected to the partition 4
The area of 3 mm from the end of No. 4 is covered with a detachable ink cover in a state of not contacting the partition wall 44. Next, the partition 4
A method for forming a phosphor layer in each space partitioned by 4 will be described with reference to FIGS.

First, an average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) ) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was stirred well, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is discharged between the partition walls 44 (27) formed in a stripe shape on the rear glass substrate 43 (26), and at the same time, the rear glass substrate 43 is linearly moved in accordance with the direction of the partition walls 44. Thus, a blue phosphor line is formed.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
A red phosphor line is formed by simultaneously ejecting the coating liquid composed of the Eu ³⁺ phosphor mixture from the nozzle 23 and moving the rear glass substrate 43 linearly along the direction of the partition 44. Here, when the rear glass substrate 43 is moved linearly, inertial force acts on the blue phosphor filled between the partition walls 44 until the moving speed becomes constant, and the moving direction of the rear glass substrate 43 and Flows in the opposite direction.

However, since both ends of the partition 44 are covered with the ink cover 45, 3 m from the end of the partition 44.
In the region of m, the coating liquid composed of the phosphor mixture is not discharged.

Therefore, the coating liquid of the blue phosphor is covered by the ink cover 45 and stops flowing in the area where the coating liquid has not been ejected, so that the blue phosphor does not leak from the partition 44 to the adjacent partition. Does not occur.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the n lines, baking is performed at 500 ° C. for 10 minutes to form a phosphor layer.

Next, the back glass substrate 43 provided with the phosphor layer is bonded to the front glass substrate using sealing glass, and the discharge space 19 is filled with 8 × 10
^{Evacuate to -7} Torr vacuum. As described above, since the ink cover 45 has been removed, the discharge space can be uniformly exhausted. After exhausting the discharge space 19, the discharge space is filled with helium (He) gas containing 10% xenon (Xe) gas as a discharge gas at 500 Torr,
An AC surface discharge plasma display was used.

Next, the panel was maintained at a discharge sustaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

In this embodiment, 3 mm from the end of the partition wall.
Is covered with the ink cover, but this distance depends on the viscosity of the phosphor ink, and may be set according to the phosphor viscosity.

It is desirable that the ink cover is disposed so that the outside of the rear glass substrate is low, so that the phosphor ink attached to the ink cover does not flow to the partition wall side.

Example 8 In the same manner as in Example 1,
A method for forming the phosphor layer will be described with reference to FIG. FIG.
FIG. 2 is a schematic view of an ink ejection device used when forming a phosphor layer of a plasma display panel.

In FIG. 11, reference numeral 46 denotes a phosphor ink;
7, a nozzle for discharging the phosphor ink 46; 48, a server for supplying the phosphor ink 46 to the nozzle 47;
Reference numeral 9 denotes a pressurizer for applying pressure to the nozzle 47, and reference numeral 50 denotes an ink breaker that shuts off the phosphor ink 46 by opening and closing while facing the nozzle 47 in a non-contact manner.

On the back glass substrate 51, the partition walls 52 are formed by repeating screen printing and then firing. Next, a method of forming a phosphor layer in each space partitioned by the partition 52 will be described with reference to FIG.

First, an average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) A) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was well stirred, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is ejected toward the rear glass substrate 51, and at the same time, the rear glass substrate 51 is moved linearly along the direction of the partition wall 52 with the ink breaker 50 closed.

When the blue phosphor ink ejected from the nozzle 47 moves 3 mm from the end of the partition 52, the ink breaker 50 is opened to form a blue phosphor line between the partitions. When the blue phosphor ink discharged from the nozzle 47 has moved to a point 3 mm from the other end of the partition wall 52, the ink breaker 50 is closed, and the formation of the blue phosphor line is stopped.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
The coating liquid composed of the Eu ³⁺ phosphor mixture is discharged from the nozzle 47, and at the same time, the rear glass substrate 51 is moved linearly in the direction of the partition wall 52 to form a red phosphor line. Here, when the rear glass substrate 51 is linearly moved, an inertial force acts on the blue phosphor filled between the partition walls 52 until the moving speed becomes constant, and the moving direction of the rear glass substrate 51 is changed. Flows in the opposite direction. However, the phosphor ink is not discharged by the ink breaker 50 in a region 3 mm from both ends of the partition 52. Therefore, the blue phosphor ink stops flowing in the area where the ink is not ejected by the ink circuit breaker 50, and the blue phosphor does not leak into the adjacent partition walls, and no color mixing occurs.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the n lines, baking is performed at 500 ° C. for 10 minutes to form a phosphor layer.

Next, the rear glass substrate 51 provided with the phosphor layer is bonded to the front glass substrate by using sealing glass, and the discharge space is set to 8 × 10 ⁻⁷ T before filling the discharge gas.
Evacuate to a vacuum of orr. After the discharge space 19 was evacuated, the discharge space was filled with helium (He) gas containing 10% xenon (Xe) gas as a discharge gas at 500 Torr to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

In this embodiment, 3 mm from the end of the partition wall.
Although the area indicated by is not coated with the phosphor ink by the ink breaker, this distance depends on the viscosity of the phosphor ink, and may be set according to the viscosity of the phosphor.

(Example 9) In the same manner as in (Example 1),
A method for forming the phosphor layer will be described with reference to FIG. FIG.
FIG. 2 is a schematic view of an ink ejection device used when forming a phosphor layer of a plasma display panel.

In FIG. 12, 53 is a phosphor ink, 5
Reference numeral 4 denotes a nozzle for discharging the phosphor ink 53; 55, a server for supplying the phosphor ink 53 to the nozzle 54;
6 is a pressurizer for applying pressure to the nozzle 54, and 57 is an ink shutoff valve for shutting off the phosphor ink 53 provided in the nozzle 54.

A partition wall 59 is formed on the rear glass substrate 58 by repeating screen printing and then firing. Next, a method of forming a phosphor layer in each space partitioned by the partition wall 59 will be described with reference to FIG.

First, an average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) ) A phosphor mixture composed of 62.0% by weight and a plasticizer of 0.5% by weight was well stirred, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is directed toward the rear glass substrate 58, and the rear glass substrate 58 is moved linearly along the direction of the partition wall 57 with the ink shutoff valve 57 closed.

When the nozzle 54 has moved 3 mm from the end of the partition 59, the ink cutoff valve 57 is opened to open the partition 59.
A blue phosphor line is formed therebetween. When the nozzle 54 has moved to a point 3 mm from the other end of the partition wall 59, the ink cutoff valve 57 is closed to stop the formation of the blue phosphor line.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
A red phosphor line is formed by simultaneously discharging the coating liquid composed of the Eu ³⁺ phosphor mixture from the nozzle 54 and moving the rear glass substrate 58 linearly along the direction of the partition wall 59. Here, when the rear glass substrate 58 is moved linearly, an inertial force acts on the blue phosphor filled between the partition walls 59 until the moving speed becomes constant, and the moving direction of the rear glass substrate 58 is changed. Flows in the opposite direction.

However, the phosphor ink is not discharged by the ink cutoff valve 57 in a region 3 mm from both ends of the partition wall 59. Therefore, the flow of the blue phosphor ink is stopped in a region where the blue phosphor ink is not ejected by the ink cutoff valve 57, and the blue phosphor does not leak into the adjacent partition wall, and no color mixing occurs.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the n lines, baking is performed at 500 ° C. for 10 minutes to form a phosphor layer.

Next, the back glass substrate 58 provided with the phosphor layer is bonded to the front glass substrate using sealing glass, and the discharge space is set to 8 × 10 ⁻⁷ T before filling the discharge gas.
Evacuate to a vacuum of orr. After the discharge space 19 was evacuated, the discharge space was filled with helium (He) gas containing 10% xenon (Xe) gas as a discharge gas at 500 Torr to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

In this embodiment, 3 mm from the end of the partition wall.
Although the phosphor ink is not applied to the region by the ink shutoff valve, this distance depends on the viscosity of the phosphor ink, and may be set in accordance with the phosphor viscosity.

(Embodiment 10) In the same manner as in (Embodiment 1), a method of forming a phosphor layer will be described with reference to FIG. FIG. 13 is a schematic view of an ink ejection device used when forming a phosphor layer of a plasma display panel.

In FIG. 13, reference numeral 60 denotes a phosphor ink;
1 is a nozzle for discharging the phosphor ink 60, 62 is a server for supplying the phosphor ink 60 to the nozzle 61, 6
Reference numeral 3 denotes a pressurizer for applying pressure to the nozzle 61, 64 denotes a first ejection hole for sending a high-speed air flow to the phosphor ink 60 disposed in the nozzle 61, and 65 denotes a first ejection hole. On the other hand, it is a second ejection hole for sending a high-speed air flow to the phosphor ink 60 provided at a position symmetrical to the nozzle hole.

The first injection hole 64 and the second injection hole 6
Reference numeral 5 is connected to a pressurizing pump (not shown) via a stop valve (not shown). By opening and closing the stop valve, high-speed air flow can be output and stopped.

Next, how the phosphor ink 60 changes due to the high-speed air flow ejected from the first ejection holes 64 and the second ejection holes 65 will be described. The first ejection holes 64 and the second ejection holes 65 are disposed substantially perpendicular to the phosphor ink 60. Therefore, the first injection hole 6
When the high-speed air flow is jetted from the second jetting hole 4, the phosphor ink 60 is ejected toward the second jetting hole 65, and when the high-speed airflow is jetted from the second jetting hole 65, the phosphor ink 60 becomes the first jetting hole 64. Blows almost horizontally to the side.

A partition 67 is formed on the rear glass substrate 66 by repeating screen printing and then firing. Next, a method of forming a phosphor layer in each space partitioned by the partition 67 will be described with reference to FIG.

First, an average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) A) A phosphor mixture comprising 62.0% by weight and 0.5% by weight of a plasticizer was well stirred, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is directed onto the rear glass substrate 66, and the high-speed air flow is jetted from the first ejection holes 64 toward the phosphor ink 60, while the rear glass substrate 66 is
Move linearly in the direction of 7.

Then, when the nozzle 61 has moved 3 mm from the end of the partition 67, the injection of the high-speed airflow from the first injection hole 64 is stopped, and a blue phosphor line is formed between the partitions 67. When the nozzle 54 moves to a point 3 mm from the other end of the partition wall 59, the second injection hole 6
From 5, a high-speed air flow is jetted onto the phosphor ink 60 to blow off the blue phosphor ink outside the partition walls, thereby stopping the formation of the blue phosphor line.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
A red phosphor line is formed by simultaneously discharging the coating liquid composed of the Eu ³⁺ phosphor mixture from the nozzle 61 and moving the rear glass substrate 66 linearly along the direction of the partition wall 67. Here, when the rear glass substrate 66 is linearly moved, an inertial force acts on the blue phosphor filled between the partition walls 67 until the moving speed becomes constant, and the moving direction of the rear glass substrate 66 is changed. Flows in the opposite direction.

However, the phosphor ink is not ejected in the area 3 mm from both ends of the partition wall 67 due to the high-speed air flow ejected from the first ejection holes 64 and the second ejection holes. Therefore, the blue phosphor ink stops flowing in the area where the phosphor ink has not been ejected due to the high-speed airflow ejected from the first ejection holes 64 and the second ejection holes, and the blue phosphor leaks to the adjacent partition walls. No color mixing occurs.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the n lines, baking is performed at 500 ° C. for 10 minutes to form a phosphor layer.

Next, the back glass substrate 66 provided with the phosphor layer is bonded to the front glass substrate using sealing glass, and the discharge space 19 is filled with 8 × 10
^{Evacuate to -7} Torr vacuum. After the discharge space 19 is evacuated, the discharge space is filled with helium (He) gas containing 10% xenon (Xe) gas as a discharge gas at 500 Torr.
It was sealed to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

In this embodiment, 3 mm from the end of the partition wall.
Area was not blown off by blowing off the phosphor ink with a high-speed air flow ejected from the ejection hole, but this distance depends on the viscosity of the phosphor ink, and may be set according to the phosphor viscosity. .

In the present embodiment, the gas injected from the injection holes is a high-speed air flow, but may be a high-speed nitrogen gas flow, for example.

(Example 11) In the same manner as in (Example 1), a method for forming a phosphor layer will be described with reference to FIG. FIG. 14 is a schematic view of an ink ejection device used when forming a phosphor layer of a plasma display panel.

In FIG. 14, reference numeral 68 denotes a phosphor ink;
9 is a nozzle for discharging the phosphor ink 68, 70 is a server for supplying the phosphor ink 68 to the nozzle 69, 7
1 is a pressurizer for applying pressure to the nozzle 69, and 72 is a first suction hole for changing the direction of the phosphor ink 68 by applying a negative pressure field to the phosphor ink 68 disposed on the nozzle 69. , 73 are second suction holes for changing the direction of the phosphor ink 68 by applying a negative pressure field to the phosphor ink 68 provided at a position symmetrical to the nozzle hole with respect to the first suction hole. is there.

The first suction hole 72 and the second injection hole 7
Numeral 3 is connected to a vacuum pump (not shown) via a stop valve (not shown). By opening and closing the stop valve, the surrounding air can be sucked or the suction can be stopped.

Next, the first suction hole 72 and the second suction hole 7
A description will be given of how the phosphor ink 68 changes by forming a negative pressure field by sucking the surrounding air from FIG. When the surrounding air is sucked from the first ejection holes 72, the pressure near the first suction holes 72 becomes negative, and the phosphor ink 68 is drawn toward the first ejection holes 72, and when the surrounding air is sucked from the second ejection holes 65. Negative pressure is applied to the vicinity of the second suction hole 73 and the phosphor ink 68 blows off almost horizontally to the second ejection hole 73 side.

A partition 75 is formed on the rear glass substrate 74 by repeating screen printing and then firing. Next, a method for forming a phosphor layer in each space partitioned by the partition 75 will be described with reference to FIG.

First, an average particle size of 2.0 μm
Blue phosphor BaMgAl ₁₀ O ₁₇ : Eu ²⁺ powder 3
0% by weight, 4.5% by weight of ethyl cellulose (molecular weight: 200,000), 2% by weight of a dispersant (glyceryl trioleate), 1% by weight of silica (SiO ₂ ) particles having an average particle diameter of 0.01 μm, and a solvent (butyl carbitol acetate) A) A phosphor mixture composed of 62.0% by weight and 0.5% by weight of a plasticizer was well stirred, and a coating liquid having a density of 10 centipoise (cp) was added.
μm), the blue phosphor is directed onto the rear glass substrate 74, and the surrounding air is sucked from the first suction holes 72 to direct the phosphor ink 68 toward the first suction holes 73. 74 is moved linearly along the direction of the partition 75.

When the nozzle 69 moves 3 mm from the end of the partition 75, the suction of the surrounding air from the first suction hole 72 is stopped, and a blue phosphor line is formed between the partitions 75. Further, when the nozzle 69 moves to a point 3 mm from the other end of the partition 75, the surrounding air is sucked from the second ejection hole 73 and the direction of the phosphor ink 68 is changed to the second suction hole 73 side. The formation of the blue phosphor line is stopped by blowing the blue phosphor ink toward the outside from the partition wall.

Subsequently, a red phosphor (Y _X Gd _{1 -X} ) BO ₃ :
The coating liquid comprising the Eu ³⁺ phosphor mixture is discharged from the nozzle 69, and at the same time, the rear glass substrate 74 is moved linearly in the direction of the partition 75 to form a red phosphor line. Here, when the rear glass substrate 74 is moved linearly, an inertial force acts on the blue phosphor filled between the partition walls 75 until the moving speed becomes constant, and the moving direction of the rear glass substrate 74 and Flows in the opposite direction.

However, the fluorescent ink is not ejected from the first suction hole 72 and the second suction hole 73 in a region 3 mm from both ends of the partition 75. Therefore, the blue phosphor ink stops flowing in the region where the phosphor ink has not been ejected by the first ejection holes 72 and the second ejection holes 73, so that the blue phosphor does not leak into the adjacent partition walls, and color mixing is performed. Does not occur.

Similarly, the green phosphor Zn ₂ SiO ₄ : M
After forming the n lines, baking is performed at 500 ° C. for 10 minutes to form a phosphor layer.

Next, the back glass substrate 74 provided with the phosphor layer is bonded to the front glass substrate using sealing glass, and the discharge space is set to 8 × 10 ⁻⁷ T before filling the discharge gas.
Evacuate to a vacuum of orr. After the discharge space 19 was evacuated, the discharge space was filled with helium (He) gas containing 10% xenon (Xe) gas as a discharge gas at 500 Torr to obtain an AC surface discharge plasma display.

Next, this panel was set to a discharge maintaining voltage of 150.
V, the wavelength of ultraviolet light when discharged at a frequency of 30 KHz is the excitation wavelength of a molecular beam of Xe centered at 173 nm (from indirect experiments), and the luminance of the panel is 4
It was 80 cd / m ² .

In this embodiment, 3 mm from the end of the partition wall.
The area of the area was not applied by sucking the surrounding air from the suction hole and changing the direction of the phosphor ink, but this distance depends on the viscosity of the phosphor ink, and should be set according to the phosphor viscosity. I just need.

The above phosphor layers are formed not only on the glass substrate but also on the side surfaces of the partition walls.

[0155]

As described above, the plasma display panel using the method for forming a phosphor layer according to the present invention is an excellent method which can be used to form a phosphor layer with high accuracy, stability and low cost. This is a method that can be applied to a wide-range pitch of TV specifications to a plasma display panel of a fine pitch including HDTV.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an ink line forming method according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a plasma display panel according to an embodiment of the present invention.

FIG. 3 is a schematic sectional view of an ink ejection apparatus according to Embodiments 2 to 7 of the present invention.

FIG. 4 is a perspective view schematically showing an ink line forming method according to a second embodiment of the present invention.

FIG. 5 is a diagram showing the thermal decomposition characteristics of isodecyl methacrylate used in Examples 2 and 3 of the present invention.

FIG. 6 is a perspective view schematically showing an ink line forming method according to a third embodiment of the present invention.

FIG. 7 is a perspective view schematically showing an ink line forming method according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view schematically showing an ink line forming method according to a fifth embodiment of the present invention.

FIG. 9 is a perspective view schematically showing an ink line forming method according to a sixth embodiment of the present invention.

FIG. 10 is a perspective view schematically showing an ink line forming method according to a seventh embodiment of the present invention.

FIG. 11 is a schematic sectional view of an ink ejection device according to an eighth embodiment of the present invention.

FIG. 12 is a schematic sectional view of an ink ejection device according to a ninth embodiment of the present invention.

FIG. 13 is a schematic sectional view of an ink ejection device according to a tenth embodiment of the present invention.

FIG. 14 is a schematic sectional view of an ink ejection device according to an eleventh embodiment of the present invention.

FIG. 15 is a sectional view of a conventional plasma display panel.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 back glass substrate 21 partition wall 30 wall of heated sublimable resin 33 adhesive layer of heated sublimable resin 36 nonwoven fabric 39 nichrome wire 42 suction nozzle 45 ink cover 50 ink circuit breaker 57 ink cutoff valve 64 first injection hole 65 second Injection hole 72 First suction hole 73 Second suction hole

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroyuki Kado 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-company (56) References JP-A-63-155527 (JP, A) JP-A-8-162019 (JP, A) JP-A-10-27543 (JP, A) JP-A-10-172432 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 9/227 H01J 11/02

Claims (3)

(57) [Claims] At least one of a front panel and a rear panel.
The front panel and the rear panel
With a discharge space between the The phosphor layer is separated by the two partition walls adjacent to each other.
Provided in a space provided, and configured to close an end of the partition wall,
The height of the closed part is lower than the height of the partition
The configured plasma display panel. At least one of a front panel and a rear panel.
A partition is provided on the side and the end of the partition is closed and
The height of the closed part is lower than that of the partition.
And the phosphor layer is defined by the two partition walls adjacent to each other.
After forming the phosphor ink in the partitioned space, the phosphor ink is burned.
To form phosphor layer of plasma display panel
Law. 3. At least one of a front panel and a back panel.
A partition is provided on the side and the end of the partition is closed and
The height of the closed part is lower than that of the partition.
And the phosphor layer is defined by the two partition walls adjacent to each other.
After forming the phosphor ink in the partitioned space, the phosphor ink is burned.
Forming a discharge space between the front panel and the rear panel.
A gas medium that can be laminated and discharged inside to form
Of manufacturing a plasma display panel encapsulating the same.