JPH11204044A - Plasma display panel and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PDP, such as a High Vision PDP, high in luminous efficiency and luminance for the electric discharge cell size, and provide a method for manufacturing the PDP. SOLUTION: A visible light reflecting layer 17 and barrier ribs 18 are formed in a back plate glass substrate 15 and phosphor layers 19-21 respectively emitting R, G, B colors and having about 12 μm average film thickness in a region H having a face along the visible light reflecting layer 17 and about 25 μm average film thickness in a region V having a face besides the region H are also formed. Consequently, fluorescent light beams out of the phosphor layers in the electric discharge cells are efficiently taken out. Moreover, the electric discharge space in relation to the electric discharge cell volume is kept wider than that of a conventional PDP and consequently the intensity of electroluminescence emitted by ultraviolet stimulation is heightened. As a result, the efficiency of the fluorescent light emission is improved.

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 television receiver, a display, and the like.
And its manufacturing method.

[0002]

2. Description of the Related Art In recent years, as the demand for higher performance of televisions such as high-quality images and large screens has increased, various displays such as high-definition televisions have been developed. The main types of typical displays for which research is progressing include CRT displays and liquid crystal displays (L
CD), a plasma display panel (PDP) and the like.

[0003] Among them, the PDP is excellent in that it can avoid the problems of the increase in the depth size and weight of the CRT and the problems of the visual field of the LCD which occur when a large screen is assumed. Has developed a large screen product of the 40-inch class (functional materials, 19
Vol. 16, February No. 96, No. 2, p. 7). FIG.
1 is a cross-sectional view showing an example of an AC type color PDP (see Japanese Patent Application Laid-Open No. 5-3421991). As shown in the figure, the AC type PDP has a front glass substrate (front cover plate) 41 and a rear glass substrate (back plate) 45 arranged in parallel with each other.
The display electrode 42, the dielectric glass layer 43 covering the display electrode 42, and the dielectric protection layer 4
4, partition walls 47 arranged perpendicularly to the glass substrates 41 and 45 at regular intervals, and address electrodes 46 provided on the rear glass substrate 45 and the like. Here, a configuration surrounded by a pair of opposed partition walls 47, the dielectric protection layer 44, and the back glass substrate 45 is called a discharge cell.

[0004] Phosphor layers 50 to 52 are formed on the rear glass substrate 45 and the partition wall 47, and the address electrodes 46 are included in the phosphor layers 50 to 52. The phosphor layers 50 to 52 have red, green, and blue (R, G,
B) Each color component phosphor is contained. These are short wavelengths generated by a discharge between the address electrode 46 and the display electrode 42 opposed thereto in a discharge space 49 surrounded by the dielectric protection layer 44, the partition wall 47, the phosphor layers 50 to 52, and the like. Fluorescence is emitted by ultraviolet light (wavelength: about 147 nm).

[0005]

The brightness of the PDP depends mainly on the intensity of ultraviolet rays generated in the discharge gas (He-Xe system, Ne-Xe system, etc.).
~ 42 inch class (640 x 480 pixels, cell pitch 0.43 mm x 1.29 mm, unit cell area 0.55
mm ² ) in the NTSC PDP, the ultraviolet rays (wavelength
47 nm) to obtain a luminous efficiency of about 1.0 lm / W. However, in full-size large-size high-definition televisions, which are expected in recent years, for example, the number of pixels is 1920 × 1125 and the cell pitch is 0.15 m at 42 inches.
mx 0.48 mm and unit cell area 0.072 mm ²
Performance is required, and a considerably finer configuration is required as compared with current PDP products.

Here, when the unit cell is miniaturized, the discharge space becomes finer. In general, the intensity of excitation light emitted by ultraviolet rays is proportional to the volume of the discharge space, and the reflection luminance is also increased by the area of the light receiving area of the phosphor layer. Due to such a property, the problem that excitation light emission is weakened and light emission efficiency is deteriorated is likely to occur. When a large-sized high-vision PDP is manufactured with the conventional technology, the luminous efficiency is considered to be reduced to about 0.6 lm / W.

SUMMARY OF THE INVENTION In view of the foregoing, an object of the present invention is to provide a PDP capable of obtaining higher luminous efficiency and luminance than a conventional PDP even in a fine unit cell, and a method of manufacturing the same.

[0008]

According to the present invention, a front cover plate and a back plate having a partition formed on a surface thereof are arranged in parallel with each other, and a phosphor layer is formed on the partition and the back. A plasma display panel disposed over a plate surface, wherein a visible light reflecting layer is provided between the back plate and the phosphor layer, and a transmittance of the phosphor layer for visible light is a partition. It is characterized in that it is set on average higher on the visible light reflecting layer than on the upper side. Here, the “transmittance for visible light” refers to the “transmittance for visible light emitted from the phosphor layer”.

Further, the present invention relates to a plasma display panel in which a front cover plate and a back plate having a partition formed on the surface are arranged in parallel with each other, and a phosphor layer is disposed on the partition and the back plate surface. A visible light reflection layer is provided between the back plate and the phosphor layer, and the phosphor layer is in an averagely thin state in a region having a surface along the visible light reflection layer than on the partition walls. Features.

[0010] Here, it is desirable that the phosphor layer on the back plate surface has a thickness of 2 to 7 times the average particle diameter of the phosphor forming the phosphor layer. Further, the particle shape of the phosphors forming all the phosphor layers is such that when the longest distance from the center point of the particles to the surface is L ₁ and the shortest distance is L ₂ , 0.8 ≦ L ₁ / L ₂ ≦ It is desirable that the shape satisfies 1.0.

Also, the particle size distribution has a particle size distribution in which the cumulative value of the particle size distribution is 10% A ₁₀ , and the particle size of the cumulative value 90% is A _90, and x = 100 A / (A + A ₉₀ -A) ₁₀ ) x
When (%) is defined as the particle size concentration, the particle size concentration of the phosphor forming the phosphor layer is preferably 50% or more and 100% or less. Here, it is more desirable that the particle concentration of the phosphor forming the phosphor layer is 80% or more and 100% or less.

Further, in the manufacturing method of the present invention, a first step of providing a visible light reflecting layer and a partition on a back plate surface;
A second step of forming a phosphor layer over the partition wall surface and the visible light reflecting layer, and a third step of disposing a front cover plate facing the back plate surface on which the partition wall is formed.
And a step of providing a partition having a larger surface roughness than the visible light reflecting layer or providing a partition having a smaller contact angle with the phosphor ink in the first step. Accordingly, in the second step, a phosphor layer having a smaller average film thickness is formed in a region having a surface along the visible light reflecting layer than on the partition.

Here, it is used in the second step.
The phosphor ink has a shear rate of 200 S ^-1The viscosity at
It is desirable to set 1000 centipoise at 25 ° C.
No. Further, the phosphor I used in the second step is used.
The link is a phosphor of not less than 20 wt% and not more than 60 wt%.
It is desirable to include particles. In the second step,
The phosphor ink used is terpineol and phosphor particles.
And 0.1% to 7% by weight of ethyl cellulose
It is desirable to include

In the second step, the phosphor layer is preferably formed by filling at least 80% of the volume of the discharge space with the phosphor ink. Preferably, in the second step, the phosphor layer is formed by discharging the phosphor ink from the nozzle tip.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Overall Configuration of PDP) Hereinafter, a PDP according to an embodiment of the present invention will be described. FIG. 1 is a sectional view schematically showing an AC surface discharge type PDP which is an application example of the present invention. As shown in the figure, the PDP has a display electrode (discharge electrode) 12, a dielectric glass layer 13, a protective layer 14, and the like sequentially arranged on a front glass substrate 11, while an address electrode 16 is formed on a rear glass substrate 15, and visible. The light reflection layer 17 and the like are arranged in this order, and the protective layer 14 and the visible light reflection layer 17 are arranged at a fixed interval via a plurality of partitions 18 perpendicular to the respective surfaces. The partition 18 is to form a discharge cell by joining with the protective layer 14 and the visible light reflecting layer 17. In each discharge cell, a phosphor layer of any one of R, G, and B colors is formed on the partition wall surface and the visible light reflecting layer, and a discharge gas is sealed therein.

The display electrode 12 and the address electrode 16
Both are stripe-shaped silver electrodes, which are arranged so as to form an orthogonal matrix. Dielectric glass layer 13
Is a layer made of lead-containing glass having a thickness of about 20 μm,
It is formed uniformly on the surface of the front glass substrate 11 while covering the display electrodes 12. The protective layer 14 laminated on the dielectric glass layer 13 is a thin layer of magnesium oxide (MgO) having a thickness of about 1.0 μm.

The visible light reflecting layer 17 is made of a dielectric glass having a thickness of about 20 μm containing titanium fine particles, and thereby has both the reflectivity for visible light and the function as a dielectric layer. The partition wall is made of alumina-containing glass, and has a height and a pitch between adjacent partition walls of 0.15 mm, and protrudes from the surface of the visible light reflecting layer.

The size of the present PDP having such a configuration is set to a 42-inch display for a high-definition television, and the number of pixels is 1920 × 1125 and the cell pitch is 0.1.
15mm × 0.48mm, unit cell area 0.072mm ²
It has become. This PDP was manufactured by the following manufacturing method. (Manufacturing Method of PDP) A paste for the address electrodes 16 was screen-printed on one main surface of the rear glass substrate 15 at a pitch of 0.15 mm in a stripe shape, and then fired to form the address electrodes 16.

Next, 75% by weight of lead oxide (PbO) · 1
A small amount of titanium oxide (TiO ₂ ) particles were mixed with a lead-containing glass paste composed of 5% by weight of boron oxide (B ₂ O ₃ ) and 10% by weight of silicon oxide (SiO ₂ ). Screen printing was performed on the main surface so as to cover the address electrodes 16 and baked to form a visible light reflecting layer 17 having a thickness of about 20 μm.

Subsequently, a glass paste containing alumina is screen-printed in a stripe shape at a pitch of 0.15 mm on the visible light reflecting layer 17, and the glass paste is laminated several times and fired to a height of 0.1 mm. A 15 mm partition 18 was formed. The visible light reflecting layer 17 and the partition 18 have a larger contact angle of the phosphor ink 29 described later on the visible light reflecting layer 17 than on the surface of the partition 18 (specifically, the contact angle is greater than that of the visible light reflecting layer 17). About 13 ° on the partition wall 17
The composition ratio is set in order to make the surface (approximately 8 ° above).

Next, on the surface of the partition wall 18 and the visible light reflecting layer 1
R, G, and B phosphors were applied and baked on 7 to form phosphor layers 19 to 21 as follows. In the present invention, a phosphor generally used in a PDP can be used as the phosphor of each color. In the present embodiment, a red phosphor (Y _x Gd) is used.
_1-x ) BO ₃ : Eu ³⁺ , green phosphor (Zn ₂ SiO ₄ : M
n), a blue phosphor (BaMgAl ₁₀ O ₁₇ : Eu ²⁺ ) was prepared. Each phosphor used had an average particle size of about 3 μm.

Next, the phosphor ink is applied, and a screen printing method can be used as the application method. However, in the present invention, when performing high-definition coating, problems such as color mixing may occur, which is not preferable.
Therefore, in the present embodiment, the following method is adopted. A solvent containing 45% by weight of a phosphor and 1.8% by weight of a binder was mixed with a solvent having a viscosity of 50 at 25 ° C. at a shear rate of 200 S ⁻¹ .
It was adjusted to be centipoise, and this was used as a phosphor ink. Here, ethyl cellulose is used as the organic binder,
Α-Terpineol was used as a solvent.

Subsequently, as shown in FIG.
The tip of a nozzle 30 (nozzle diameter 80 μm, pressure 0.5 kgf / cm) connected to a tank 28 containing 9 is positioned on the visible light reflecting layer 17 and scanned at a speed of 50 mm / s along the longitudinal direction of the partition 18. By keeping the distance between the tip of the nozzle 30 and the visible light reflecting layer 17 at 100 μm, the phosphor ink 2 is caused to act on the two opposing partitions 18 by the meniscus of the phosphor ink 29 (crosslinking due to surface tension).
9 was continuously injected between the partition walls 18. At this time, about 90% of the phosphor ink 29 was filled for each cell pitch.

Here, the above-mentioned phosphor ink 29
The viscosity is an example of a numerical value set in order to continuously and smoothly discharge the phosphor ink 29 from the nozzle 30 and to form the meniscus of the phosphor ink 29 in a favorable manner. The range is considered as follows. That is, it is desirable that the viscosity at a shear rate of 200 S ⁻¹ be not more than 1000 centipoise at 25 ° C.

Further, by setting the contact angles of the partition walls 18 and the visible light reflecting layer 17 with the phosphor ink as described above, the following problems were suppressed. FIG. 4 is a rear glass side sectional view showing a state where phosphor ink 29 is injected between the conventional partition walls 18. Conventionally, when the phosphor ink 29 is injected between the partition walls 18, after a while, FIG.
As shown in the side cross-sectional view of the rear glass, there is a possibility that the film is shifted onto the rear glass 15 by its own weight and dried as it is. On the other hand, in the present embodiment, since the contact angle is larger on the surface of the visible light reflecting layer 17 than on the surface of the partition wall 18, the phosphor ink 29 is used as shown in FIG. The above-mentioned shift was improved by being strongly adsorbed on the surface of the partition wall 18. The composition of the phosphor ink 29 is preferably a composition having a slightly lower fluidity than ink used in screen printing or the like in order to form a phosphor layer having an appropriate thickness on the surface of the partition wall 18. That is, the phosphor is added at 20% by weight or more.
60% by weight, and 0.1% by weight of ethylcellulose
It is desirable that the content be within the range of 7 to 7% by weight. In the above description, an example is shown in which 90% of the phosphor ink is injected between the cell pitches. However, the range that is considered preferable for forming a phosphor layer having a large area is 80% or more.

After the phosphor ink 29 was dried, it was baked at about 500 ° C. for 10 minutes. As shown in the sectional view of the partition wall in FIG. 6, the average film thickness of the region H having a surface along the visible light reflecting layer 17 is about 12 μm,
The phosphor layers 19 to 21 having an average film thickness of about 25 μm in a region V having a surface other than the surface along the line V were obtained. Here, each phosphor layer described below will be described using the above-described region H and region V. The thicknesses of the phosphor layers 19 to 21 were actually confirmed by a scanning electron microscope (SEM).

On the other hand, a paste for the display electrode 12 was screen-printed on the front glass substrate 11, and the display electrode 12 was formed by firing. On this, 75% by weight of lead oxide (P
A 20 μm-thick lead-based dielectric glass layer 13 made of (bO) · 15% by weight of boron oxide (B ₂ O ₃ ) · 10% by weight of silicon oxide (SiO ₂ ) was laminated by screen printing and firing.

On the dielectric glass layer 13, a protective layer 14 made of magnesium oxide (MgO) having a thickness of about 1.0 μm was laminated by a CVD method (chemical vapor deposition method). Where C
The VD method is a method in which a reaction system gas or a mixed gas of a reaction system molecule and an inert gas is reacted on a heated substrate to deposit a reaction product. In this embodiment, magnesium acetylacetone [Mg (C ₅
H ₇ O ₂ ) ₂ ], but cyclopentadienyl magnesium [Mg (C ₅ H ₅ ) ₂ ] or the like may be used.

It is determined that the MgO layer formed by the chemical vapor deposition method has a crystal structure oriented in the (100) plane.
Confirmed by line analysis. Next, while facing the surface on the rear glass substrate 15 side on which the partition wall 18 is disposed and the surface on the front glass substrate 11 side on which the protective layer 14 is disposed, they are bonded together with sealing glass, A discharge space 22 was formed. The inside of the discharge space 22 is vacuumed to 8 × 10 ⁻⁷ To.
The pressure was reduced to rr, and helium (He) gas containing 5% xenon (Xe) gas was used as a discharge gas at 500 Torr.
r sealed. The PDP of the present embodiment was manufactured by the above method.

(Detailed Description of Phosphor Layer and Visible Light Reflecting Layer) When the PDP produced as described above is energized at a discharge sustaining voltage of 150 V and a frequency of 30 kHz, the luminance is about 400 cd / m ² and the luminous efficiency is It was about 0.7 lm / W. As a comparative example, when the thickness of the phosphor layer is uniformly formed to be about 25 μm in both the regions H and V, the luminance becomes about 35 μm.
0 cd / m ² , and the luminous efficiency was about 0.6 lm / W. Further, the thickness of the phosphor layer is 12 μm in the region V and the thickness of the region H is 12 μm.
, The brightness is about 34 μm.
0 cd / m ² , and the luminous efficiency was about 0.58 lm / W.

From this result, it is understood that the luminous efficiency and the luminance are improved by setting the thickness of the region H of the phosphor layer to be smaller than the conventional thickness of about 20 μm. On the other hand, a blue phosphor (BaMgAl ₁₀ O ₁₇ : Eu) having an average particle size of 3 μm
²⁺ ), a phosphor layer having an average film thickness set in steps of about 5 μm is formed, and the luminance (reflection luminance) of the fluorescence obtained by irradiating ultraviolet rays (about 147 nm) of the same intensity to these layers is obtained. Tracked. FIG. 2 summarizes the results of the investigation on the relationship between the reflection luminance and the thickness of the phosphor layer. A curve 23 in FIG. 2 shows a case where a visible light reflecting layer is provided under the phosphor layer, and a curve 24 shows a case where no visible light reflecting layer is provided (that is, corresponds to the phosphor layer on the partition wall surface).

As shown in this figure, when the visible light reflecting layer is not provided, the reflection luminance is proportional to the increase in the film thickness until the film thickness of the phosphor layer reaches about 20 μm. Approximately reaches saturation luminance. On the other hand, when the visible light reflecting layer is provided, the reflection luminance is proportional to the film thickness of the phosphor layer to some extent, but reaches the saturation luminance as soon as the film thickness is about 12 μm or more. Here, the saturated luminance indicates a constant luminance value in which the phosphor layer asymptotically approaches regardless of the film thickness. This confirms that the reflection luminance can be secured on the visible light reflecting layer even if the thickness of the phosphor layer is set to be small.

Further, from the results of the graph of FIG. 2, when the visible light reflecting layer is provided in the phosphor layer having the same thickness, a slightly higher reflection luminance is obtained as a whole than when the visible light reflecting layer is not provided. You can see that As a result, the visible light reflecting layer 17 reflects the fluorescent light emitted from the phosphor particles in the phosphor layer in the direction of the back glass 15 by the excitation light emission of the ultraviolet light in the direction of the front glass 11, thereby contributing to the improvement of the brightness. It also suggests that you do.

The effect of improving the luminance by making the phosphor layer thinner on the visible light reflecting layer is that the phosphor layer can be clearly obtained in a film thickness range of about 12 μm to about 20 μm using the visible light reflecting layer. Can be seen from FIG. However, when the thickness of the phosphor layer is about 6 μm, the reflection luminance is almost the same as when there is no visible light reflection layer. However, in the discharge cell of the PDP, the discharge space has an average thickness of about 20 μm to about 30 μm. Since the thickness of the phosphor layer in the region H can be considerably widened as compared with the conventional phosphor layer having a thickness of about 6 μm to about 12 μm.
Even in the range of m, high luminance is obtained as a result. In the case of a phosphor particle having an average particle diameter of about 3 μm, this range corresponds to an average particle diameter of about 2 to 7 times, whereby the phosphor layer is composed of two or more phosphor particles. It is expected that there is a need to Further, in order to improve the luminance when the thickness of the phosphor layer in the region H is in a range of about 6 μm to about 20 μm while securing a discharge space with a fine discharge cell like a PDP for a high-definition television, a visible light reflection is required. Approximately 12 μm to approximately 2 in which the reflection luminance is higher than when no layer is provided.
It is desirable to form a phosphor layer having a thickness of 0 μm as the region H. Here, in the case of actually manufacturing a PDP, if the phosphor layer in the region H is formed thicker than about 20 μm, only the discharge space of a conventional discharge cell can be secured. Since the effect of the reflective layer is weakened, it is not preferable to use a phosphor layer having a thickness greater than this value.

Although detailed numerical values are not shown, blue fluorescent light having an average particle size of 3 μm and originally having a hexagonal plate shape is obtained by a method described in JP-A-62-202089 or JP-A-7-268319. Body (BaMgAl ₁₀ O ₁₇ :
Eu ²⁺ ) was processed into a shape that satisfies the formula 1, that is, a spherical shape or a shape close to a spherical shape. As a result, when compared to those using phosphors that are not spherically processed, the reflective brightness and luminous efficiency for a given film thickness are further improved for those with a phosphor layer of spherically processed phosphors laminated on the visible light reflective layer. I found out.

[0036]

[Equation 1] 0.8 ≦ L₁/ L_Two≦ 1.0 where L₁Is the longest distance from the center of gravity of the particle to the surface, L_TwoIs
It is the shortest distance. Further, the average particle size A having a particle size distribution
Particle size concentration x (%) = 100A / (A + A ₉₀-A_Ten)
In other words, the x value was changed for the phosphor particles of A = 3 μm.
However, each of the phosphor particles having a different particle size distribution with different x values.
As shown in FIG. 2, the relationship between the reflection luminance and the thickness of the phosphor layer is
I checked the staff. Where A_TenIndicates that the cumulative value of the particle size distribution is 10%
Particle size of A₉₀Is the particle size for which the cumulative value of the particle size distribution is 90%
You.

As a result, when x = 50 (%), the thickness of the phosphor layer reaching the saturation luminance is about 12 μm, and x = 8
At 0% or more, the film thickness was about 9 μm. This x = 8
Using a phosphor having a particle size concentration of 0 (%),
When a PDP having a phosphor layer with a thickness of about 25 μm in the region V and about 9 μm in the region H is manufactured by the DP manufacturing method,
A luminous efficiency of 0.75 lm / W was obtained. Such a result was obtained because the particle size became more uniform as the value of the particle size concentration increased, the gap between the phosphor particles in the phosphor layer became larger, and the visible light transmittance was increased. This is probably because the reflection effect of the visible light reflecting layer was increased. Further, the use of a thin phosphor layer contributes to increasing the luminous intensity of the excitation light emission itself by increasing the discharge space. Therefore, in order to obtain a high luminous efficiency and brightness in a small discharge cell is to minimize the difference between A ₁₀ and A _90, it is desirable to form the phosphor layer by uniform phosphor particles.

The phosphor used in this embodiment is:
The present invention is not limited to the above-described phosphor, and other general ones may be used. For the combination of the solvent and the binder, an organic solvent such as diethylene glycol methyl ether or water can be used as the solvent, and PMMA (polymethyl methacrylate) can also be used as the binder.
Or a synthetic polymer such as PVA (polyvinyl alcohol).

By the way, in this embodiment, in order to adjust the adsorbing force of the phosphor ink on the partition walls and the visible light reflecting layer,
Although the example in which the contact angle between the partition wall surface and the phosphor ink is set to be smaller than the contact angle with the visible light reflective layer has been described, the roughness of the surface that contacts the phosphor ink is also used. You may do so. The surface roughness is about 5 μm at the partition,
In the case where the thickness of the visible light reflecting layer is about 0.5 μm, there is an example in which a phosphor layer can be formed thicker on the partition wall.

In this embodiment, an example in which the visible light reflecting layer is uniformly laminated on the surface of the rear glass plate has been described. However, the present invention is not limited to this. First, a partition is provided on the surface of the plate, and then a glass paste containing a visible light reflecting material such as titanium oxide is applied on the back glass plate surface between the partitions, whereby a visible light reflecting layer is provided. Is also good.

In this embodiment, an example in which the phosphor ink contains 45% by weight of the phosphor is used. However, if the phosphor ink contains 20% to 60% by weight of the phosphor, the phosphor ink may be used. It has been found that almost the same results can be obtained in this range. Further, in the present embodiment, the average particle size is 3 μm.
m phosphor particles were used, but the present invention is not limited to this.
What is necessary is just a thing below μm. Phosphor particles significantly larger than 5 μm are not preferable when used as a phosphor ink, because they may settle between application of the ink and subsequent drying.

In this embodiment, an AC type PDP capable of color display has been described. However, the present invention is not limited to this, and may be applied to a monochrome type PDP or a DC type PDP.

[0043]

As described above, according to the present invention, it is possible to effectively extract the fluorescence emitted from the phosphor layer in the discharge cell. Further, the discharge space with respect to the discharge cell volume can be made wider than before, and the intensity of the ultraviolet excitation light emission can be increased. As a result, the efficiency of the fluorescent light emission can be improved. Therefore, when the present invention is applied to a high-definition type fine discharge cell, there is an effect that a PDP having relatively high luminance and luminous efficiency can be obtained.

Further, according to the manufacturing method of the present invention, the above PD having excellent luminance and luminous efficiency even in a fine unit cell.
P can be manufactured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main configuration of an AC surface discharge type plasma display panel which is an application example of the present invention.

FIG. 2 is a diagram showing the relationship between the reflection luminance and the thickness of a phosphor layer.

FIG. 3 is a schematic diagram showing a phosphor ink injection step.

FIG. 4 is a schematic diagram showing a state between partition walls into which a conventional phosphor ink is injected.

FIG. 5 is a schematic view showing a state between partition walls after a phosphor ink is conventionally injected and dried.

FIG. 6 is a schematic diagram showing a drying process of the phosphor ink when the adsorbing force of the phosphor ink on the visible light reflecting layer with the phosphor ink is smaller than that of the partition wall surface.

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

[Explanation of symbols]

11, 41 Front glass substrate (front cover plate) 12, 42 Silver electrode 13, 43 Dielectric glass layer 13, 44 Dielectric protection layer 15, 45 Back glass substrate (back plate) 16, 46 Address electrode 17 Visible light reflecting layer 18, 47 Partition wall 19, 50 Phosphor layer (red) 20, 51 Phosphor layer (green) 21, 52 Phosphor layer (blue) 22, 49 Discharge space 29 Phosphor ink 30 Nozzle

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tomizo Matsuoka 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Shigeta Lighting 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (12)

[Claims] 1. A front cover plate and a back plate having a partition formed on its surface are arranged in parallel with each other,
A plasma display panel in which a phosphor layer is disposed over the entire surface of the partition wall and the surface of the back plate, wherein a visible light reflecting layer is provided between the back plate and the phosphor layer, A plasma display panel wherein the transmittance of the phosphor layer to visible light is set to be higher on the visible light reflecting layer than on the partition walls on average. 2. A front cover plate and a back plate having a partition formed on a surface thereof are arranged in parallel with each other,
A plasma display panel in which a phosphor layer is disposed over the partition and the back plate surface, wherein a visible light reflecting layer is provided between the back plate and the phosphor layer, and the phosphor layer is formed on the partition. A plasma display panel characterized in that it is set to be thinner on average in a region having a surface along a visible light reflecting layer than on a plasma display panel. 3. The phosphor layer on the back plate surface,
3. The plasma display panel according to claim 1, wherein the thickness of the phosphor layer is equal to or more than 2 times and not more than 7 times the average particle diameter of the phosphor forming the phosphor layer. 4. The particle shape of the phosphor constituting all the phosphor layers is such that when the longest distance from the center of gravity of the particle to the surface is L ₁ and the shortest distance is L ₂ , 0.8 ≦ L ₁ / L 4. The plasma display panel according to claim 1, wherein said plasma display panel has a shape satisfying ₂ ≦ 1.0. 5. For a phosphor particle having a particle size distribution and an average particle size of A, the particle size at which the cumulative value of the particle size distribution is 10% is A ₁₀ , and the particle size at which the cumulative value is 90% is A ₁₀ A ₉₀ and x
= 100A / x (%) represented by (A + A ₉₀ -A ₁₀₎ when the defined as the particle径集moderate, 100% or less particle径集moderate phosphors 50% or more to form a phosphor layer The plasma display panel according to any one of claims 1 to 4, wherein 6. The plasma display panel according to claim 5, wherein the phosphor forming the phosphor layer has a particle concentration of 80% or more and 100% or less. 7. A first step of providing a visible light reflecting layer and a partition on a back plate surface, and a second step of forming a phosphor layer with phosphor ink over the partition surface and the visible light reflecting layer; A third step of disposing a front cover plate facing the back plate surface on which the partition wall is formed, wherein in the first step, a surface roughness larger than a visible light reflecting layer is provided. In the second step, by providing a partition wall having a thickness of less than or a partition wall having a smaller contact angle with the phosphor ink than the visible light reflection layer, the phosphor layer is arranged along the visible light reflection layer more than on the partition wall. A method for manufacturing a plasma display panel, comprising: forming an average thickness in a region having a surface. 8. The phosphor ink used in the second step has a viscosity at a shear rate of 200 S ⁻¹ of 25 ° C.
8. The method according to claim 7, wherein the pressure is set to 1000 centipoise or less. 9. The method of manufacturing a plasma display panel according to claim 7, wherein the phosphor ink used in the second step contains phosphor particles in an amount of 20% by weight or more and 60% by weight or less. . 10. The phosphor ink used in the second step includes terpineol, phosphor particles, and ethyl cellulose that accounts for 0.1% by weight or more and 7% by weight or less based on the total weight of the phosphor ink. 10. The method for manufacturing a plasma display panel according to any one of 7 to 9. 11. The plasma display according to claim 7, wherein in the second step, the phosphor layer is formed by filling the discharge space with the phosphor ink by 80% or more, drying and firing. Panel manufacturing method. 12. The method according to claim 7, wherein in the second step, the phosphor layer is formed by discharging phosphor ink from a nozzle tip.