JP2002100296A - Plasma display panel and manufacturing process therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the luminance of a phosphor layer of a plasma display panel. SOLUTION: A high luminance plasma display panel is obtained by making the plate shape ratio as large as 3 or more and employing a method forming a phosphor material layer 18 by coating a phosphor ink within barrier ribs wherein the phosphor ink is spouted continuously from a thin pipe.

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 and the like, and more particularly to an improvement in a phosphor.

[0002]

2. Description of the Related Art Conventionally, as a display used for a television, a CRT which has been conventionally used can be considered. A CRT is superior to a plasma display and a liquid crystal in terms of resolution and image quality. Not suitable for large screens of 40 inches or more in depth and weight. In addition, the liquid crystal has excellent performance such as low power consumption and low driving voltage, but there are limitations on the size of the screen and the viewing angle.

On the other hand, a plasma display is
Since there is no problem of depth and viewing angle, a large-screen display can be realized, and a 40-inch class product has already been developed (for example, Functional Materials, February 1996, Vol. 16, No. 2). , Page 7).

A conventional configuration of the plasma display panel will be described with reference to a screen. FIG. 7 is a cross-sectional view schematically showing an AC type (AC type) plasma display panel.

In FIG. 7, reference numeral 41 denotes a front cover plate (front glass substrate), on which a display electrode 42 is formed. Further, the front cover plate 41 on which the display electrodes 42 are formed
Represents a dielectric glass layer 43 and magnesium oxide (Mg)
O) is covered with a protective layer 44 (for example,
See JP-A-5-342991).

Reference numeral 45 denotes a back plate (back glass substrate). On the back glass substrate 45, address electrodes 46, partition walls 47, and a spherical phosphor layer 48 are provided. Is a discharge space for enclosing the discharge space.

[0007] The brightness of the current 40- to 42-inch class plasma display is based on the NTSC pixel level (640 x 480 pixels, cell pitch 0.4).
3 mm x 1.29 mm, area of one cell 0.55 mm ² )
At 150 to 250 cd / m ² (for example,
Functional Materials, February 1996, Vol. 16, No. 2,7
See page 7). In contrast, it is said that a conventional CRT can obtain a luminance of about 500 cd / m ² .

At the pixel level of a full-spec high-definition television which is expected in recent years, the number of pixels is 1920 × 1.
125, and the cell pitch is also 42 inch class.
15mm x 0.48mm and the area of one cell is 0.072m
It becomes fineness of m ^2. When a high-definition television with a plasma display panel is manufactured in the same 42-inch size, the area of one pixel is 1/7 to 1 in comparison with NTSC.
/ 8.

Therefore, when a 42-inch high-definition television is manufactured using a plasma display panel using the same phosphor, gas composition and gas pressure, the luminance becomes 30 to 40.
It is expected to be as low as cd / m ^2, and improvement in luminance is desired.

[0010]

As described above, when a television having a small screen such as a high-definition television is manufactured using a plasma display panel, the current N
There is a problem that if the brightness is to be set to the same level as TSC, the brightness must be significantly improved.

Accordingly, an object of the present invention is to provide a plasma display panel in which the luminance of a phosphor is improved by improving the phosphor, thereby realizing a high luminance.

[0012]

According to the plasma display panel of the present invention, in order to achieve the above object, an electrode and a plurality of color phosphor layers are arranged between a pair of parallelly arranged plates. Is formed, a discharge space is formed in which the gas medium is sealed by being partitioned by the partition wall, and emits ultraviolet rays with the discharge,
A plasma display panel that emits light by converting it into visible light with the phosphor layer, wherein the shape of the phosphor particles constituting the phosphor layer of at least one color is plate-like,
The plate diameter is 0.3 μm to 6 μm and the plate thickness is 0.1 μm to 2 μm.
μm, wherein the plate-like particles are stacked to cover the side wall or the bottom of the partition wall.

The conventional phosphor for a plasma display panel is generally at a high temperature at which crystals grow easily in a spherical shape (the firing temperature varies depending on the composition of the phosphor, but is, for example, 1200 ° C. or higher). Phosphor particles that have been fired for a long time and thus have a large particle diameter (about 5 to 10 μm) and are close to spherical have been used. When the phosphor particles having a nearly spherical shape manufactured as described above are used for a conventional CRT or a fluorescent lamp, the phosphor is formed into a spherical shape, and a transmission type that allows visible light to pass through a gap between the spheres (between the phosphors). It was convenient because of the panel system.

However, the plasma display panel has a short wavelength ultraviolet (147, 1) generated by electric discharge.
73 nm), a phosphor is generated, and the manner of light emission is a reflective panel. Therefore, when a phosphor having a shape close to a sphere is used as the phosphor layer, the coverage of the partition walls and the bottom of the partition walls becomes low, and ultraviolet rays are emitted. It will not be available enough.

On the other hand, so-called flat particles having a large ratio between the plate diameter and the plate thickness of the plate-shaped phosphor particles are used as the phosphor film, and the coverage of the partition walls and the bottom is increased, so that the phosphor layer is formed. , The amount of ultraviolet absorption increases, and thus the luminance of the panel can be improved. This is because the wavelength is 143nm
And 173 nm ultraviolet rays, unlike electron beams used in CRTs, can enter only the surface layer (0.1 μm or less) of the phosphor on the very surface of the discharge space (for example, monthly LCD Intelligence 199).
June / September, p. 58) It shows that more ultraviolet rays can be absorbed from the surface by increasing the filling rate and the covering rate of the phosphor layer.

Therefore, if the coverage or filling rate of the phosphor is increased, the emission intensity of the phosphor layer is increased, and the phosphor itself acts as a visible light reflecting film by increasing the filling rate of the phosphor. Therefore, the reflection luminance can be improved at the same time. This effect is remarkably obtained by using plate-like phosphor particles for the phosphor layers of all colors.

In order to obtain the phosphor particles in the form of a plate as described above, it is necessary to change the firing conditions, starting materials, or firing atmosphere when manufacturing the phosphor. That is, by raising the baking temperature to some extent and baking for a short time, it is possible to obtain phosphor particles having excellent crystallinity on the very surface of the phosphor but having a large plate-like ratio.

Blue and green have a hexagonal crystal system (for example, see P21 of Phosphor Handbook).
9, P225, Ohm Co., Ltd.), it is easy to obtain hexagonal plate-shaped phosphor particles, but it is difficult to obtain plate-shaped phosphor particles because red is a cubic system. However, yttrium hydroxide (Y ₂ (OH ₃ )) ) As a starting material makes it easier to obtain plate-like particles.

If the plate thickness is too small or the plate diameter is too small, the phosphor particles aggregate, so that the brightness is rather lowered. Actually, the thickness is 0.1 μm to 3 μm.
m, the plate diameter is preferably set to 0.3 μm to 6 μm.

By the way, in the case of the phosphor particles having a large plate-like ratio as described above, it is desirable to manufacture the phosphor particles by adding a large amount of an activator in order to secure a sufficient emission point with respect to the amount of ultraviolet rays to be absorbed. . Therefore, the content of the activator is defined as in claims 2 to 4.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Overall Configuration and Manufacturing Method of PDP) FIG. 1 is a schematic sectional view of an AC surface discharge type PDP according to one embodiment of the present invention. Although only one cell is shown in FIG. 1, a PDP is configured by alternately arranging a large number of cells emitting red, green, and blue colors.

This PDP has a front panel in which a discharge electrode 12 and a dielectric glass layer 13 are arranged on a front glass substrate 11, an address electrode 16 and a partition wall 1 on a rear glass substrate 15.
7. A structure in which a discharge gas is sealed in a discharge space 19 formed between the front panel and the back panel by laminating a back panel provided with a phosphor layer 18 using a plate-like phosphor. The PDP is driven by applying a voltage to the discharge electrode 12 and the address electrode 16 by the drive circuit shown in FIG.

In FIG. 1, for convenience, the discharge electrodes 12 are shown in a cross section. However, in practice, the discharge electrodes 12 are arranged in a direction along the paper plane of FIG. is set up.

Preparation of Front Panel: The front panel has a discharge electrode 12 formed on a front glass substrate 11, a lead-based dielectric glass layer 13 covering the discharge electrode 12, and a dielectric glass layer 13.
It is manufactured by forming a protective layer 14 on the surface of the substrate.

The discharge electrode 12 is an electrode made of silver.
It is formed by screen printing and firing a silver paste for an electrode.

The dielectric glass layer 13 is made of, for example, 70% by weight of lead oxide [PbO] and 15% by weight of 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 560 ° C for 20 minutes gives a film thickness of about 2
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.

Preparation of back panel: On the back glass substrate 15, using the screen printing method in the same manner as the discharge electrodes 12,
An address electrode 16 is formed.

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. 3 is a view showing a method of forming a partition by thermal spraying. First, the surface of the rear glass substrate 15 (A in FIG. 3) on which the address electrodes 16 are formed is covered with a dry film 81 made of an acrylic photosensitive resin (B in FIG. 3).

The cono dry film 81 is patterned by photolithography. That is, a photomask 82 is placed on the dry film 81, and only portions where partition walls are to be formed are irradiated with ultraviolet light (UV) 83 (C in FIG. 3) and developed, thereby forming a partition wall. The dry film 81 is removed, and a mask of the dry film 81 is formed only on the portion where the partition is not formed (see D in FIG. 3). The phenomenon is performed in an aqueous solution of about 1% alkali (specifically, an aqueous solution of sodium carbonate).

Then, alumina (Al ₂ O ₃ ), spinel (MgO.Al ₂ O ₃ ), and zircon (ZrO ₂ ), which are raw materials of the partition wall, are plasma sprayed. In order to improve the contrast of PDP, black alumina such as Cr ₂ O ₃ , TiO ₂ , C ₀ O,
Oxides such as Fe ₂ O ₃ and MnO ₂ and mixtures thereof can be sprayed.

FIG. 4 is a diagram showing 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.

The raw materials (alumina, Cr ₂ O ₃ , T
by feeding a powder of iO _2, etc.) therein, spraying the surface of the substrate 15 by melting the raw materials in the plasma jet.

Thus, a sprayed film 84 of a raw material is formed on the surface of the substrate 15. Thus, the membrane 8
The substrate 15 on which the substrate 4 is formed (E in FIG. 3) is immersed in a stripping solution (sodium hydroxide solution) to remove the mask of the dry film 81 (lift-off method). Along with this, the portion 84b of the raw material film 84 formed on the mask of the dry film 81 is removed, leaving only the portion 84a directly formed on the substrate 15, which becomes the partition wall 17 (FIG. 3). F).

Then, the phosphor layer 18 is formed in the groove between the partition walls 17.
To form The method of forming the phosphor layer 18 will be described later in detail, but the phosphor layer 18 is formed by applying and burning the phosphor ink by a method of operating while continuously ejecting the phosphor ink from the nozzles.

In this embodiment, the height of the partition wall is 0.1 in accordance with a 40-inch class high-definition television.
~ 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 by using sealing glass, and the inside of the discharge space 19 partitioned by the partition wall 17 is subjected to high vacuum (for example, 8 × 10 ^-7 T
orr) and then discharge gas (e.g., He-Xe
A PDP is manufactured by enclosing an inert gas (Ne, Xe-based inert gas) at a predetermined pressure.

Next, a circuit block for driving the PDP is mounted as shown in FIG. 2 to manufacture a PDP display device.

In this embodiment, the content of Xe in the discharge gas is set to 5% by volume, and the filling pressure is set to 500 to 80%.
Set to the range of 0 Torr.

(Regarding Method of Forming Phosphor Layer) FIG.
Ink coating device 20 used when forming phosphor layer 18
FIG.

As shown in FIG. 5, the ink application device 2
At 0, the phosphor ink is stored in the server 21, and the pressurizing pump 22 pressurizes this ink and supplies it to the header 23. The header 23 is provided with an ink chamber 23 a and a nozzle 24.
The ink supplied to a is continuously ejected from the nozzle 24.

The header 23 is formed integrally with the ink chamber 23a and the nozzle 24 by machining and electric discharge machining of a metal material.

The phosphor ink is prepared by mixing the phosphor particles, the binder, and the solvent component of each color with a surfactant, silica, and the like, as needed, so as to 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 are shown below.

Blue phosphor: BaMgAl ₁₀ O ₁₇ : Eu ²⁺ Green phosphor: BaAl ₁₂ O ₁₉ : Mn or Zn ₂ SiO ₄ : Mn Red phosphor: (Y _x Gd _{1 -x} ) BO ₃ : Eu ³⁺ Alternatively, in order to suppress clogging of the YBO ₃ : Eu ³⁺ nozzle and precipitation of particles, the average plate diameter of the plate-like phosphor particles used in the phosphor ink is preferably 6 μm or less. In order for the phosphor to obtain good luminous efficiency, the average thickness of the phosphor is preferably 0.1 μm to 2 μm. The plate ratio (plate diameter / plate thickness) of the phosphor particles is
3 to 25 are preferred.

The phosphor ink has a viscosity of 10 at 25 ° C.
00 centipoise or less (15-1000 centipoise)
It is desirable to adjust within the range.

The particle size of silica as an additive is from 0.01 to
0.02 μm, the addition amount is preferably 1 to 10% by weight,
Further, it is desirable to add a dispersant in an amount of 0.1 to 5% by weight.

The diameter of the nozzle 24 is preferably 45 μm or more and smaller than the groove width W between the partition walls 17 in order to prevent clogging of the nozzle.

In the server 21, the ink is stored while being mixed and stirred by a stirrer (not shown) installed in the server 21 so that the particles in the ink do not settle.

The pressure of the pressure pump 22 is adjusted so that the flow of the ink ejected from the nozzle 24 is continuous.

The header 23 is configured to be scanned on the rear glass substrate 15. The scanning of the header 23
In this embodiment, the header 23 is driven by a header scanning mechanism (not shown) which drives the glass substrate linearly. However, the header 23 may be fixed and the glass substrate may be driven linearly. While scanning the header 23, ink is sprayed from the nozzles 24 so as to form a continuous ink flow 25 (jet line), whereby the ink is uniformly applied onto the glass substrate in a linear manner.

Note that, in the ink applying apparatus 20, FIG.
As shown in FIG. 6, a plurality of nozzles may be provided on the header 23 and scanning may be performed while ejecting ink from each nozzle in parallel (in FIG. 6, the arrow A indicates 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.

In this manner, the phosphor ink is applied by the ink applying device 20 on the back glass substrate 15 along the partition walls 17 for each of the red, blue, and green colors. And
The red, green, and blue phosphor inks are sequentially applied to predetermined grooves and dried, and then the panel is baked (at about 500 ° C. for 10 minutes) to form the phosphor layer 18.

As described above, the phosphor layer 18 is formed by applying ink continuously instead of applying the ink as droplets as in the conventional ink jet method. Is uniform in thickness.

In such an ink coating device,
If three ink chambers of red, blue, and green and nozzles of each color are provided in one header and the phosphor inks of three colors are ejected in parallel, the fluorescent light of three colors can be scanned in one scan. Body ink can also be applied.

Next, the phosphor used in the phosphor layer will be described.
I will tell. Does the phosphor used in the present embodiment have a conventional composition?
Made of metal oxides used for
As a specific composition of the body, the blue phosphor includes BaMg.
Al_TenO₁₇Is a crystal skeleton and a certain amount of oxidation
Europium Eu_TwoO_ThreeContaining BaMgAl
_TenO ₁₇: Eu²⁺For the red phosphor, YBO_ThreeThe crystal bone
And a predetermined amount of Eu as an activator_TwoO_ThreeY containing
BO_Three: Eu³⁺For the green phosphor, Zn_TwoSiO_FourTie
A predetermined amount of Mn as an activator_TwoO_ThreeIs contained
Zn_TwoSiO_Four: Mn ²⁺Can be mentioned.

As these phosphors, a (flat) phosphor having a large plate ratio (ratio of plate diameter to plate thickness) is conventionally used.

By using a phosphor having a large plate ratio as described above, the coverage of the phosphor layer of each cell is increased, so that the efficiency of absorbing ultraviolet rays by discharge is improved, and the panel luminance can be improved. . The phosphor can be obtained by baking at a relatively high temperature and in a short time as compared with the conventional case to suppress the crystal growth of the phosphor particles in the thickness direction.

In the case of red phosphors such as YBO ₃ and YGdBO ₃ , plate-like particles can be formed by using a hydroxide such as Y ₂ (OH) ₃ as a starting material or by a hydrothermal synthesis method (high-temperature high-pressure synthesis method). Can be created.

The range of the average plate diameter and the average plate thickness is limited when the average plate diameter is less than 0.3 μm or when the average plate thickness is 0.1 μm or less, because the particles are too fine and the fluorescent particles are too small. This is because the body particles aggregate and the absorption of ultraviolet rays in each particle is inhibited by the adjacent particles, and the absorption amount is reduced. Also, when the particle diameter is so small, the crystal structure is not sufficiently formed in many cases, so that there is a tendency that sufficient phosphor luminance cannot be obtained.

However, it is considered that the aggregation of the phosphor particles can be suppressed to some extent by devising a matrix such as a solvent for dispersing the phosphor particles used in forming the phosphor layer. It is considered that phosphor particles having a smaller plate diameter and a larger plate ratio can be used.

Each color phosphor used in this embodiment is as follows.
It is produced as follows. First, the blue phosphor is
Barium carbonate (BaCo_Three), Magnesium carbonate (M
gCO_Three), Aluminum oxide (α-Al_TwoO_Three) To B
Formulated so that the atomic ratio of a, Mg and Al is 1: 1: 1: 10
I do. Next, a predetermined amount of euro oxide is added to the mixture.
Pium (Eu_TwoO_Three) Is added. And an appropriate amount of flash
Box (AlF_Two, BaCl _Two) Mixed with ball mill
And at a temperature of 1400 ° C. to 1650 ° C. for a predetermined time (for example, 0.
5 hours), weak reducing atmosphere (H_Two, N_TwoAfter firing in the middle)
Get it by sieving.

To change the plate ratio, the firing temperatures H ₂ and N ₂
This is carried out by changing the flow ratio firing time.

The red phosphor is blended with yttrium hydroxide Y ₂ (OH) ₃ and boric acid (H ₃ BO ₃ ) as raw materials so that the atomic ratio of Y and B is 1: 1. Next, a predetermined amount of europium oxide (Eu ₂ O ₃ ) is added to the mixture,
Mix with a ball mill with an appropriate amount of flux
After baking at 200 ° C. to 1450 ° C. for a predetermined time (for example, 1 hour), this is sieved to obtain the powder.

The green phosphor is made of zinc oxide (Zn) as a raw material.
O) and silicon oxide (SiO ₂ ) at an atomic ratio of Zn and Si of 2
Mix to make one. Next, a predetermined amount of manganese oxide (Mn ₂ O ₃ ) is added to the mixture, mixed with a ball mill, and fired at 1200 ° C. to 1350 ° C. in air for a predetermined time (for example, 0.5 hour). To obtain.

The above plate diameter and plate thickness are values obtained by observing the powder with an electron microscope. Compared to hexagonal plate-shaped blue and green phosphors, the red phosphor has a cubic crystal system,
The plate ratio becomes slightly smaller. Therefore, it is necessary to set the red phosphor slightly smaller than the plate. To change the plate ratio, the firing temperature and the firing time are changed.

As described above, it is desirable to use one having a large plate ratio for all colors, but it is also possible to apply only one color or only two colors of the phosphor.

For example, it is possible to improve the panel luminance by using a blue phosphor having a large plate ratio and combining it with a conventional spherical red or green phosphor.

This is usually the case with a conventional PDP.
Since the blue phosphor has the least luminance, the luminance of the phosphor layer is set low by reducing the application amount of the red and green phosphor layers or by adding an additive such as silica, and the white balance is adjusted. This is because the panel luminance has to be limited by the luminance of the blue phosphor because of the adoption, but the restriction is lifted by realizing the improvement of the luminance of the blue phosphor.

Accordingly, it can be said that the significance of improving the luminance of the blue phosphor according to the present invention is significant.

The phosphor layer is a phosphor layer formed by an ink jet method. In the case of this method, since ink having a relatively low viscosity is used, it is difficult to apply the phosphor to the side wall of the partition wall, particularly in the case of a conventional phosphor having a large particle diameter, which is difficult to be applied. Phosphors having a small particle size and a large plate-like ratio, such as the form described above, have low sedimentation of the phosphor particles in the ink, so that the phosphor can be applied to the side walls of the partition walls, and the phosphor coverage can be reduced. The brightness can be improved together with the improvement.

Finally, the use of plate-like phosphor particles and the use of low-viscosity ink in the drying step after injecting the phosphor ink into the partition walls result in a stack of plate-like particles and a thin phosphor film. Even if it is thick, it can completely cover the side wall or the bottom of the partition wall, so that the total amount of the phosphor can be reduced and the cost of the panel can be reduced.

[0074]

[Examples] [Examples 1 to 7 and Comparative Examples 8 to 10]

[0075]

[Table 1]

[0076]

[Table 2]

[0077]

[Table 3]

[0078]

[Table 4]

Sample No. The PDPs 1 to 7 are PDPs according to examples manufactured based on the above embodiment,
By changing the gas flow ratio, the sintering temperature and the sintering time, phosphors having different plate diameters, plate thicknesses, plate ratios and particle diameters are formed, and the concentrations of activators to be added are set to various values.

Sample No. In the PDPs 1 to 7, the firing temperature of each phosphor is set higher in order, and the average plate diameter is set larger. The average thickness is set small by shortening the firing time. The concentration of the activator had little effect on the luminance in the concentration range of each color.

In each of the PDPs, the thickness of the dielectric glass layer was 20 μm, and the thickness of the MgO protective layer was 0.5 μm.
m, and the distance between the discharge electrodes was set to 0.08 mm.

Sample No. PDPs 8 to 10 are PDPs according to comparative examples. Sample No. 8 to 10 PDPs
The plate ratio is set small by controlling the firing temperature and firing time of the blue phosphor particles. Except for these characteristic points, the sample No. 7 has the same settings as the PDP.

The composition of the ink is adjusted by adjusting the viscosity of the ink by combining a resin, a solvent or a dispersant in accordance with the particle diameter and the plate ratio so that the phosphor ink can be continuously ejected from the nozzle. Ink viscosity 15 centipoise to 1000
A phosphor film having a good coating shape (a phosphor layer can also be formed on the side wall of the partition wall) was obtained between centipoise.

In the preparation of the partition walls by the thermal spraying method, white alumina (Al ₂ O ₃ ) or gyricon (ZrO ₂ ) spinel (Mg
High brightness can be obtained by using only O.Al ₂ O ₃ ).
Chromium oxide (Cr ₂ O ₃ ) or Al ₂ O ₃
By providing a black partition wall material such as + TiO ₂ , C ₀ O, MnO ₂ , and Fe ₂ O ₃ (Sample Nos. 1 to 9), the contrast of the panel can be improved.

The sample No. With respect to each of the PDPs 1 to 10, the panel luminance was measured under a discharge condition where the discharge sustaining voltage was 150 V and the frequency was 30 KHz. The results are shown in Table 4 above.

In each PDP, the light emitting layer of each color is defined so that the white balance of the panel can be obtained at the time of light emission.

As for the contrast, the luminance ratio between when the panel was not lit and when the panel was not lit was measured in a dark room.

Sample No. PDPs 1 to 7 and sample N
o. As is clear from the comparison of the PDP results of 8 to 10, especially when the blue plate diameter is 0.3 μm to 6 μm, the plate thickness is 0.1 μm to 2 μm, and the plate ratio is in the range of 3 to 25. Has a greater improvement in luminance.

The sample No. In 9 and 10, since the blue plate ratio is small, the blue luminance is low. Therefore, even if the plate ratio of the red and green phosphors is as large as 7.5 and 10, the white balance of the panel (color temperature 900 ° C) is obtained. Is set), the luminance of blue becomes a rule and it is not useful for improving the luminance of the panel. In addition, the sample No. using a black material on the upper part of the partition wall material. Sample Nos. 1 to 9 all used white materials. It can be seen that the contrast is improved from 10.

[0090]

As described above, in the plasma display panel of the present invention, the electrodes and the phosphor layers of a plurality of colors are arranged between a pair of parallelly arranged plates, and are partitioned by the partition walls. A plasma display panel in which a discharge space in which a gas medium is sealed is formed, emits ultraviolet light in accordance with the discharge, and emits light by being converted into visible light by the phosphor layer, and constitutes a phosphor layer of at least one color. The plate-like ratio of the phosphor particles is 3 or more, and the plate-like particles are stacked to cover the side wall or the bottom of the partition wall.

As described above, by forming the phosphor layer with the phosphor particles having a plate ratio greater than the conventional plate ratio of 3 or more, the efficiency of absorbing the ultraviolet light of the phosphor layer is improved, and To achieve an improvement in brightness.

Here, the average plate diameter of the phosphor particles is set to 0.1.
By setting the particle size to 3 μm to 6 μm, it is possible to rationally obtain phosphor particles having a large plate-like ratio and causing the above-described effect.

Further, such a flat and fine phosphor having a plate-like ratio of 3 or more is used, and the particles are subjected to an ink jet method (a method of continuously discharging ink from a thin tube).
Thus, a high-brightness, high-contrast panel can be obtained by coating the inside of the partition having a black upper part.

[Brief description of the drawings]

FIG. 1 shows an AC surface discharge type PD according to an embodiment of the present invention.
Schematic sectional view of P

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

FIG. 3 is a view showing a method of forming a partition by a thermal spraying method.

FIG. 4 is a view showing plasma spraying.

FIG. 5 is a schematic configuration diagram of an ink application device used when forming a discharge electrode, an address electrode, and a phosphor layer in the present embodiment.

FIG. 6 is a perspective view showing a filling operation using an example of the ink application device.

FIG. 7 is a cross-sectional view of a conventional AC type plasma display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Front glass substrate 12 Discharge electrode 13 Dielectric glass layer 14 Protective layer 15 Rear glass substrate 16 Address electrode 17 Partition wall 18 Phosphor layer 19 Discharge space 81 Dry film 82 Photomask 83 Ultraviolet light (UV) 84 Plasma spray film 90 Plasma spray Device 91 Cathode 92 Anode

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09K 11/78 C09K 11/78 H01J 9/227 H01J 9/227 E (72) Inventor Hiroyuki Kado Osaka 1006, Kadoma, Kadoma Matsushita Electric Industrial Co., Ltd. 5C028 FF01 FF11 FF12 5C040 FA01 FA04 GB03 GB14 GG07 GG09 MA03 MA23

Claims (10)

[Claims] 1. A method according to claim 1, further comprising the steps of:
An electrode and a phosphor layer of a plurality of colors are provided, a discharge space is formed in which a gas medium is sealed by being partitioned by a partition wall, and emits ultraviolet rays with the discharge, and is converted into visible light by the phosphor layer. A plasma display panel that emits light, wherein at least one phosphor particle of each of blue, red, and green phosphor particles constituting the phosphor layer is a plate-like particle,
The plate diameter is 0.3 μm to 6 μm and the plate thickness is 0.1 μm
A plasma display panel having a thickness of 2 μm, a ratio of a plate diameter to a plate thickness of 3 to 25, and wherein the plate-like particles are stacked to cover the side wall or the bottom of the partition. 2. Between a pair of parallelly arranged plates,
An electrode and a phosphor layer of a plurality of colors are provided, a discharge space is formed in which a gas medium is sealed by being partitioned by a partition wall, and emits ultraviolet rays with the discharge, and is converted into visible light by the phosphor layer. A plasma display panel that emits light, wherein the blue phosphor constituting the phosphor layer has an atomic formula of Ba _1-x
Eu _x Mg Al consists ₁₀ O _17, europium (Eu) of the atomic ratio x is 0.03 to 0.25 platy Ba Mg Al ₁₀ O _17: In Eu ^2+, the average plate diameter of 0. 3 μm to 6 μm, the plate thickness is 0.1 μm to 2 μm,
A plasma display panel wherein a ratio of a plate diameter to a plate thickness is 3 to 25, and wherein the plate-like particles are stacked to cover the side wall or the bottom of the partition wall. 3. Between a pair of parallelly arranged plates,
An electrode and a phosphor layer of a plurality of colors are provided, a discharge space is formed in which a gas medium is sealed by being separated by a partition, and ultraviolet rays are emitted with the discharge, and the phosphor layer converts the light into visible light. A plasma display panel which emits light according to the following formula, wherein the red phosphor constituting the phosphor layer is represented by an atomic formula Y _1-x
Plate-like YBO ₃ composed of Eu _x BO ₃ and having an atomic ratio x of europium (Eu) of 0.05 to 0.15; Eu ³⁺
The average plate diameter is 0.5 μm to 6 μm and the plate thickness is 0.1 μm.
2 μm to 2.0 μm, and the ratio of plate diameter to plate thickness is 2.5 to 15
Wherein the plate-like particles are stacked to cover the side wall or the bottom of the partition wall. 4. Between a pair of parallelly arranged plates,
An electrode and phosphor layers of a plurality of colors are provided, and are separated by partition walls.
To form a discharge space in which the gas medium is sealed,
Emits ultraviolet light, and is converted into visible light by the phosphor layer.
Plasma display panel
The green phosphor constituting the phosphor layer has an atomic formula (Zn)
_1-x Mn_x)_TwoSiO_FourManganese (Mn) source
Plate-like Zn having a child ratio x of 0.01 to 0.05 _Two Si
O_Four: Mn²⁺And the average plate diameter is 0.3 μm to 6 μm
And the ratio of the plate diameter to the plate thickness is 3 to 0.1 μm to 2 μm.
25, wherein the plate-like particles are piled up on the partition wall side.
Plasma screen characterized by coating the surface or bottom
Spray panel. 5. Between a pair of parallelly arranged plates,
A method for manufacturing a plasma display panel in which electrodes and phosphor layers of a plurality of colors are arranged, and a discharge space in which a gas medium is enclosed and partitioned by partition walls is formed, wherein the phosphor layer is formed of at least one plate. The liquid containing the phosphor, the solvent, the resin binder, and the dispersant has a viscosity of 15
A method of manufacturing a plasma display panel, comprising: forming by spraying phosphor ink of about 1000 centipoise; and stacking the plate-like particles to cover the side surface or the bottom of the partition wall. 6. The method according to claim 5, wherein the resin binder is ethyl cellulose or an acrylic resin. 7. The plate-like phosphor has a plate diameter of 0.3 μm.
6. The method according to claim 5, wherein the thickness is 0.1 to 2 [mu] m, and the ratio of the plate diameter to the thickness is 3 to 25. 8. The plate-shaped phosphor according to claim 1, wherein said plate-like phosphor has an atomic formula of Ba ₁ -xE.
It consists of u _x Mg Al ₁₀ O _17, europium (E
plate-shaped Ba having an atomic ratio x of u) of 0.03 to 0.25
Mg Al ₁₀ O ₁₇ : Eu ^2+, with an average plate diameter of 0.
The thickness of the plate is 3 μm to 6 μm, the plate thickness is 0.1 μm to 2 μm, and the ratio of the plate diameter to the plate thickness is 3 to 25.
A manufacturing method of the plasma display panel according to the above. 9. The plate-like phosphor according to claim 1, wherein said plate-like phosphor has an atomic formula of Y _1-x Eu _x
A plate-like YBO ₃ composed of BO ₃ and having an atomic ratio x of europium (Eu) of 0.05 to 0.15; Eu ³⁺ ;
The average plate diameter is 0.5 μm to 5 μm and the plate thickness is 0.2 μm.
6. The method according to claim 5, wherein the ratio of the plate diameter to the plate thickness is from 2.5 to 15 [mu] m. 10. The plate-like phosphor has an atomic formula (Zn _{1 -x}
Mn _x ) ₂ SiO ₄ , wherein the atomic ratio x of manganese (Mn) is 0.01 to 0.05 in the form of plate-like Zn ₂ Si
O ₄ : Mn ²⁺ whose average plate diameter is 0.3 μm to 6 μm
And the ratio of the plate diameter to the plate thickness is 3 to
The method according to claim 5, wherein the number is 20.