JP2010267559A - Plasma display panel and paste for forming protective layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel of low power consumption, which has a display performance of high definition and high luminance. <P>SOLUTION: The PDP includes: a front plate where a dielectric layer is so formed as to cover a display electrode formed on a substrate and a protective layer is formed on the dielectric layer; and a back plate which is so arranged opposite to the front plate as to form a discharge space while an address electrode is formed in the direction orthogonal to the display electrode and a partition wall dividing the discharge space is provided. The protective layer has nano crystal particles, and is formed of a paste containing water or ethanol. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plasma display panel used for a display device or the like and a paste used for forming a protective layer thereof.

  Since plasma display panels (hereinafter referred to as PDP) can achieve high definition and large screen, 65-inch class televisions have been commercialized. In recent years, PDP has been applied to high-definition televisions having more than twice the number of scanning lines as compared with the conventional NTSC system, and a PDP containing no lead component is required in consideration of environmental problems.

  A PDP basically includes a front plate and a back plate. The front plate is a glass substrate made of sodium borosilicate glass by a float method, a display electrode composed of a striped transparent electrode and a bus electrode formed on one main surface of the glass substrate, and a display electrode A dielectric layer that covers and acts as a capacitor, and a protective layer made of magnesium oxide (MgO) formed on the dielectric layer. On the other hand, the back plate is a glass substrate, stripe-shaped address electrodes formed on one main surface thereof, a base dielectric layer covering the address electrodes, a partition formed on the base dielectric layer, It is comprised with the fluorescent substance layer which light-emits each of red, green, and blue formed between the partition walls.

  The front plate and the back plate are hermetically sealed with their electrode forming surfaces facing each other, and Ne—Xe discharge gas is sealed at a pressure of 55 kPa to 80 kPa in a discharge space partitioned by a partition wall. PDP discharges by selectively applying a video signal voltage to the display electrode, and the ultraviolet rays generated by the discharge excite each color phosphor layer to emit red, green and blue light, thereby realizing color image display (See Patent Document 1).

JP 2007-48733 A

  In such a PDP, the protective layer formed on the dielectric layer of the front plate protects the dielectric layer from ion bombardment due to discharge, and emits initial electrons for generating address discharge. It is done. Protecting the dielectric layer from ion bombardment plays an important role in preventing an increase in discharge voltage, and emitting initial electrons for generating an address discharge is an address discharge error that causes image flickering. It is an important role to prevent.

  In order to increase the number of initial electrons emitted from the protective layer and reduce the flicker of the image, for example, an attempt has been made to add Si or Al to MgO.

  In recent years, high definition has been advanced in televisions, and a low-cost, low-power-consumption, high-brightness full HD (high definition) (1920 × 1080 pixels: progressive display) PDP is required in the market. Since the electron emission characteristics from the protective layer determine the image quality of the PDP, it is very important to control the electron emission characteristics.

  The present invention has been made in view of such problems, and an object of the present invention is to realize a PDP having high-definition and high-luminance display performance and low power consumption.

  In order to achieve the above object, the PDP of the present invention includes a front plate in which a dielectric layer is formed so as to cover a display electrode formed on a substrate and a protective layer is formed on the dielectric layer, and a front plate. A back plate that is arranged opposite to form a discharge space and has an address electrode in a direction intersecting with the display electrode and provided with a partition that partitions the discharge space, and the protective layer has nanocrystalline particles, And it is formed with the paste containing water or ethanol.

  Here, the content of water or ethanol is desirably 1% by weight to 10% by weight, and the average particle size of the nanocrystal particles is desirably 10 nm or more and 100 nm or less.

  Moreover, the paste for forming a protective layer of the PDP of the present invention is characterized by containing nanocrystal particles having an average particle diameter of 10 nm to 100 nm and water or ethanol.

  The present invention provides a PDP that improves electron emission characteristics, has charge retention characteristics, and can achieve both high image quality, low cost, and low voltage, thereby achieving low power consumption, high definition, and high brightness. A PDP having display performance can be realized.

The perspective view which shows the structure of PDP in embodiment of this invention Sectional drawing which shows the structure of the front plate of PDP of the 1st Embodiment of this invention Sectional drawing which shows the structure of the front plate of PDP of the 2nd Embodiment of this invention Enlarged view for explaining aggregated particles in the protective layer of the PDP Characteristic diagram showing the relationship between crystal grain size and electron emission characteristics

  Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing the structure of a PDP according to an embodiment of the present invention. The basic structure of the PDP is the same as that of a general AC surface discharge type PDP. As shown in FIG. 1, the PDP 1 has a front plate 2 made of a front glass substrate 3 and a back plate 10 made of a back glass substrate 11 facing each other, and its outer peripheral portion is sealed with a glass frit or the like. The material is hermetically sealed. The discharge space 16 inside the sealed PDP 1 is filled with a discharge gas such as Ne and Xe at a pressure of 55 kPa to 80 kPa.

  On the front glass substrate 3 of the front plate 2, a pair of strip-like display electrodes 6 made up of scanning electrodes 4 and sustain electrodes 5 and black stripes (light-shielding layers) 7 are arranged in a plurality of rows in parallel with each other. A dielectric layer 8 serving as a capacitor is formed on the front glass substrate 3 so as to cover the display electrode 6 and the light shielding layer 7, and a protective layer 9 made of magnesium oxide (MgO) is formed on the surface. Has been.

  On the back glass substrate 11 of the back plate 10, a plurality of strip-like address electrodes 12 are arranged in parallel to each other in a direction orthogonal to the scanning electrodes 4 and the sustain electrodes 5 of the front plate 2. Layer 13 is covering. Further, a partition wall 14 having a predetermined height is formed on the base dielectric layer 13 between the address electrodes 12 to divide the discharge space 16. For each address electrode 12, a phosphor layer 15 that emits red, green, and blue light by ultraviolet rays is sequentially applied to the grooves between the barrier ribs 14 and formed. A discharge cell is formed at a position where the scan electrode 4 and the sustain electrode 5 intersect with the address electrode 12, and the discharge cell having the red, green and blue phosphor layers 15 arranged in the direction of the display electrode 6 is used for color display. Become a pixel.

2 and 3 are sectional views showing the configuration of the front plate 2 of the PDP 1 in the first embodiment of the present invention. 2 and 3 are shown upside down with respect to FIG. As shown in these drawings, a display electrode 6 including a scanning electrode 4 and a sustain electrode 5 and a light shielding layer 7 are patterned on a front glass substrate 3 manufactured by a float method or the like. Scan electrode 4 and sustain electrode 5 are transparent electrodes 4a and 5a made of indium tin oxide (ITO), tin oxide (SnO ₂ ), etc., and metal bus electrodes 4b and 5b formed on transparent electrodes 4a and 5a, respectively. It is comprised by. The metal bus electrodes 4b and 5b are used for the purpose of imparting conductivity in the longitudinal direction of the transparent electrodes 4a and 5a, and are formed of a conductive material whose main component is a silver (Ag) material.

  The dielectric layer 8 is provided so as to cover the transparent electrodes 4a and 5a, the metal bus electrodes 4b and 5b, and the light shielding layer 7 formed on the front glass substrate 3, and further a protective layer 9 is formed on the dielectric layer 8. is doing.

  Next, a method for manufacturing a PDP will be described. First, the scan electrode 4, the sustain electrode 5, and the light shielding layer 7 are formed on the front glass substrate 3. The transparent electrodes 4a and 5a and the metal bus electrodes 4b and 5b are formed by patterning using a photolithography method or the like. The transparent electrodes 4a and 5a are formed using a thin film process or the like, and the metal bus electrodes 4b and 5b are solidified by baking a paste containing a silver (Ag) material at a desired temperature. Similarly, the light shielding layer 7 is also formed by screen printing a paste containing a black pigment or by forming a black pigment on the entire surface of the glass substrate and then patterning and baking using a photolithography method.

  Next, a dielectric paste is applied on the front glass substrate 3 by a die coating method or the like so as to cover the scan electrode 4, the sustain electrode 5, and the light shielding layer 7, thereby forming a dielectric paste layer (dielectric material layer). After the dielectric paste is applied, the surface of the applied dielectric paste is leveled by leaving it to stand for a predetermined time, so that a flat surface is obtained. Thereafter, the dielectric paste layer is baked and solidified to form the dielectric layer 8 that covers the scan electrode 4, the sustain electrode 5, and the light shielding layer 7. The dielectric paste is a paint containing a dielectric material such as glass powder, a binder and a solvent. Next, a protective layer 9 made of magnesium oxide (MgO) or the like is formed on the dielectric layer 8. The protective layer 9 will be described in detail later. Through the above steps, predetermined components (scanning electrode 4, sustaining electrode 5, light shielding layer 7, dielectric layer 8, and protective layer 9) are formed on front glass substrate 3, and front plate 2 is completed.

  On the other hand, the back plate 10 is formed as follows. First, the structure for the address electrode 12 is formed by a method of screen printing a paste containing silver (Ag) material on the rear glass substrate 11 or a method of patterning using a photolithography method after forming a metal film on the entire surface. An address electrode 12 is formed by forming a material layer to be an object and firing it at a desired temperature. Next, a dielectric paste is applied on the rear glass substrate 11 on which the address electrodes 12 are formed by a die coating method so as to cover the address electrodes 12 to form a dielectric paste layer. Thereafter, the base dielectric layer 13 is formed by firing the dielectric paste layer. The dielectric paste is a paint containing a dielectric material such as glass powder, a binder and a solvent.

  Next, a partition wall forming paste including a partition wall material is applied on the base dielectric layer 13 and patterned into a predetermined shape to form a partition wall material layer and then fired to form the partition walls 14. Here, as a method of patterning the partition wall paste applied on the base dielectric layer 13, a photolithography method or a sand blast method can be used. Next, the phosphor layer 15 is formed by applying a phosphor paste containing a phosphor material on the base dielectric layer 13 between the adjacent barrier ribs 14 and on the side surfaces of the barrier ribs 14 and baking it. Through the above steps, the back plate 10 having predetermined components on the back glass substrate 11 is completed.

  In this way, the front plate 2 and the back plate 10 having predetermined constituent members are arranged to face each other so that the scanning electrodes 4 and the address electrodes 12 are orthogonal to each other, and the periphery thereof is sealed with a glass frit, so that a discharge space is obtained. 16 is filled with a discharge gas containing Ne, Xe or the like, thereby completing the PDP 1.

  From here, the protective layer 9 in the 1st Embodiment of this invention is demonstrated in detail. As shown in FIG. 2, in the first embodiment of the present invention, a base film 91 made of MgO is formed on the dielectric layer 8, and MgO that is a metal oxide is formed on the base film 91. Aggregated particles 93 in which several crystal particles 92 are agglomerated are discretely dispersed.

  Further, as shown in FIG. 3, in the second embodiment of the present invention, a particle layer 95 having aggregated particles 93 in which several crystal particles 92 are aggregated is formed on the dielectric layer 8. Yes.

  Next, the reason why the protective layer 9 of the present invention has the above structure will be described. The protective layer 9 of the PDP is required to have an electron emission performance and a charge retention performance in order to perform an electron receiving operation during discharge in the discharge cell.

  Here, the electron emission performance is a numerical value indicating that the larger the electron emission amount, the higher the electron emission performance, and it is expressed by the surface state of discharge and the initial electron emission amount determined by the gas type and its state. The initial electron emission amount can be measured by irradiating the surface with an ion or electron beam and measuring the amount of electron current emitted from the surface. However, it is difficult to perform non-destructive evaluation of the front plate surface of the panel. Accompany.

  Therefore, in the present invention, the electron emission performance is evaluated as follows. First, a numerical value that is a statistical delay time, which is a measure of the ease of occurrence of discharge, is measured among the delay times during discharge. Then, by integrating the reciprocal number, it becomes a numerical value corresponding linearly to the amount of initial electron emission, and here, this numerical value is used as an index.

  This delay time at the time of discharge means the time of discharge delay that is delayed from the rise of the pulse, and the discharge delay is the time when the initial electrons that trigger when the discharge is started are discharged from the surface of the protective layer to the discharge space. It is considered as a main factor that it is difficult to be released into the inside.

  On the other hand, the charge retention performance is a value indicating performance for suppressing an image defect caused by a charge emission phenomenon when manufactured as a PDP. In the present invention, a voltage value of a voltage applied to the scan electrode (hereinafter referred to as a Vscn lighting voltage), which is a voltage required for suppressing the charge emission phenomenon during driving, is used as the index. That is, the lower the Vscn lighting voltage, the higher the charge retention capability.

  By the way, in PDP, an attempt is made to improve the electron emission characteristics by mixing impurities in the protective layer. However, if the impurities are mixed in the protective layer and the electron emission characteristics are improved, the protection is simultaneously performed. Charges are accumulated on the surface of the layer, and the decay rate at which the charges are reduced with time when used as a memory function increases. For this reason, it is necessary to take measures such as increasing the applied voltage to suppress this.

  As described above, the protective layer has a high electron emission performance and a low charge decay rate as a memory function, that is, a high charge retention property. There was a problem.

  That is, it is possible to improve the electron emission performance by changing the film forming conditions of the protective layer, or by forming a film by doping impurities such as Al, Si, and Ba in the protective layer. As a side effect, the Vscn lighting voltage also increases.

  In contrast, in the present invention, as described above, since the protective layer 9 includes the aggregated particles 93 in which the crystal particles 92 are aggregated and the layer made of MgO, both the electron emission capability and the charge retention capability are achieved. Can be satisfied.

(First embodiment of the present invention)
Next, the base film 91 according to the first embodiment of the present invention will be described. A film using nanometer-sized particles of magnesium oxide single crystal (hereinafter referred to as nanocrystal particles, not shown) is used for the base film 91. By using such particles, in addition to the above effects, there is an accompanying effect that the adsorption of impurity gas to the protective layer can be greatly reduced.

  In the following description, the particle diameter means an average particle diameter, and the average particle diameter means a volume cumulative average diameter (D50). The particle size of the magnesium oxide crystal particles was measured by observing the crystal particles with an SEM.

  Such nano-sized magnesium oxide crystal particles are produced by an instantaneous vapor phase generation method. This is a method for producing nano-sized fine particles by instantaneously cooling magnesium oxide vaporized with high energy such as plasma by a cooling gas containing a reaction gas. In the embodiment of the present invention, nanocrystal particles having a particle diameter of 5 nm to 200 nm prepared at Hosokawa Powder Technology Laboratory were used.

  Nano-sized particles with an equivalent weight distribution were mixed into a vehicle prepared by mixing 60% by weight of terpineol, 30% by weight of butyl carbitol acetate, and 10% by weight of acrylic resin EMB-001 manufactured by Mitsubishi Rayon. Create paste by smelting.

  By the way, in the prior art which forms the protective layer using nanocrystal particles, the moisture content of the protective layer is low, and there is a problem of deteriorating the luminance life. Due to the low moisture content of the protective layer, a large amount of organic component residue remains in the phosphor layer formed on the back plate in the process of firing the PDP at the time of sealing and exhausting, which causes deterioration in luminance over time. The cause is considered to be caused.

  Therefore, in this embodiment of the present invention, water or ethanol is contained in the paste. And this content is desirably 1 to 10% by weight. This is because it has been found that if the content is 1% by weight or more, the water content in the water-added nanocrystal particle film increases. In addition, if the content is 10% by weight or less, the polyvalent ions eluted from the powder containing a polyvalent metal such as ceramic powder or an oxide thereof and the carboxyl group of the organic polymer compound are ion-crosslinked to form a three-dimensional This is because it has been found that thickening and gelation are less likely to occur due to network formation.

  Such a paste is applied onto a substrate by a screen printing method or the like, dried at 100 ° C. to 120 ° C. for 60 minutes, and baked at 340 ° C. to 360 ° C. for 60 minutes. The base film 91 formed in this way can reduce the amount of impurity gas adsorbed. In addition, the film thickness of the base film 91 after baking is preferably in the range of 0.5 μm to 2 μm necessary for charge retention.

  The inventors have confirmed the reduction in the amount of adsorbed impurity gas by a temperature programmed desorption gas analysis method (hereinafter referred to as TDS). In TDS analysis, a protective layer (hereinafter referred to as an EB vapor deposition film) formed by an EB vapor deposition method generally used in the prior art, and nanocrystal particles having an average particle diameter in the range of 5 nm to 200 nm The protective layers (hereinafter referred to as “nanocrystalline particle films”) formed using the above were compared.

  As a result, moisture, carbon dioxide gas, and CH-based gas were greatly reduced in the nanocrystalline particle film with respect to the EB deposited film. Specifically, the amount of gas desorbed at 350 ° C. to 400 ° C. is rapidly increased in the EB vapor-deposited film, but such an increase is not observed in the nanocrystalline particle film.

  Further, the amount of moisture desorbed at 400 ° C. to 500 ° C. increased rapidly. This is considered to be caused by water or ethanol contained in the paste.

  And the paste (henceforth a nanocrystal particle paste) using the nanocrystal particle whose average particle diameter was the range of 5 nm-200 nm by powder X-ray diffraction method (henceforth XRD), and an average particle diameter are The crystal structures of pastes obtained by adding purified water or alcohol to pastes using nanocrystal particles in the range of 5 nm to 200 nm (hereinafter referred to as water-added nanocrystal particle pastes) were compared.

  As a result, only the magnesium oxide was detected in the nanocrystalline particle paste, whereas the magnesium hydroxide produced by the reaction of magnesium oxide and magnesium oxide particles with water was detected in the water-added nanocrystalline particle paste. In addition, it is estimated that the magnesium hydroxide produced | generated here will detach | desorb by the heat processing in a sealing and exhaust process, and will change to magnesium oxide.

  Furthermore, the inventors have found that when the average particle diameter of the nanocrystal particles is 10 nm or more and 100 nm or less, the transmittance of the protective layer 9 to visible light is less impaired, and the luminous efficiency of the PDP 1 does not decrease. It was.

  Next, the crystal particles 92 used in the protective layer 9 of the PDP according to the present invention, the aggregated particles 93 in which several of them are aggregated, and the production method thereof will be described.

  Here, as shown in FIG. 4, the agglomerated particles 93 are those in which crystal particles 92 having a predetermined primary particle size are agglomerated or necked, and are not bonded with a large binding force as a solid. In this case, multiple primary particles form an aggregate body due to static electricity, van der Waals force, etc., and are bound to the extent that some or all of them become primary particles due to external stimuli such as ultrasound. It is what. The particle diameter of the aggregated particles 93 is about 1 μm, and the crystal particles 92 preferably have a polyhedral shape having seven or more faces such as a tetrahedron and a dodecahedron.

  The particle size of the primary particles of the magnesium oxide crystal particles 92 can be controlled by the generation conditions of the crystal particles 92. For example, when a magnesium oxide precursor such as magnesium carbonate or magnesium hydroxide is calcined and produced, the particle size can be controlled by controlling the calcining temperature and the calcining atmosphere.

  Generally, the firing temperature can be selected in the range of about 700 to 1500 degrees, but the primary particle size can be controlled to about 0.3 to 2 μm by setting the firing temperature to a relatively high 1000 degrees or more. . In this way, the crystal particles 92 can be obtained by heating the magnesium oxide precursor, and in the formation process, a plurality of primary particles are obtained by a phenomenon called agglomeration or necking to obtain agglomerated particles 93. Can do.

  In addition, the inventors examined the particle size of the aggregated particles 93 that can achieve the effects of the present invention. FIG. 5 shows the experimental results of examining the electron emission performance by changing the particle size of the aggregated particles 93. As shown in FIG. 5, it can be seen that when the particle size is reduced to about 0.3 μm, the electron emission performance is lowered, and when it is approximately 0.9 μm or more, high electron emission performance is obtained.

  By the way, in order to increase the number of emitted electrons in the discharge cell, it is desirable that the number of aggregated particles 93 per unit area on the protective layer is large. However, according to the experiments by the present inventors, the presence of particles in the portion corresponding to the top of the partition wall 14 of the back plate that is in close contact with the protective film 9 of the front plate 2 breaks the top of the partition wall 14, It has been found that a phenomenon occurs in which the corresponding cell does not normally turn on and off when the material is placed on the phosphor. This phenomenon of damage to the partition wall 14 is unlikely to occur unless the aggregated particles 93 are present in the portion corresponding to the top of the partition wall 14. Therefore, if the number of particles to be attached increases, the probability of the partition wall 14 being damaged increases.

  As a result of investigations by the inventors, when the particle size of the aggregated particles 93 is increased to about 2.5 μm, the probability of partition wall breakage increases rapidly, but if the particle size is smaller than 2.5 μm, the probability of partition wall breakage is It was found that it can be kept relatively small.

  Based on the above results, in the protective layer 9 in the PDP of the present invention, it is considered desirable that the aggregated particles 93 have a particle size of 0.9 μm or more and 2.5 μm or less. Further, when mass production is actually performed as a PDP, it is necessary to take into account variations in the production of crystal particles and variations in the production when the protective layer 9 is formed. In consideration of these, it has been found that the above-described effects of the present invention can be stably obtained by using the aggregated particles 93 having an average particle diameter in the range of 0.9 μm to 2 μm, particularly in the above range.

  Then, a plurality of the aggregated particles 93 are discretely attached on the base film 91. The method will be described. First, an aggregated particle dispersion in which aggregated particles 93 having a predetermined particle size distribution are mixed and dispersed in a volatile solvent is prepared.

  Then, the aggregated particle dispersion is applied onto the base film 91 by a slit coater method or the like. In addition to the slit coater method, a die coater, a table coater, a curtain coater method, or the like can be used as a method for applying the aggregated particle dispersion onto the base film 91. Thereafter, by drying the volatile solvent of the aggregated particle dispersion applied on the base film 91, the protective layer 9 having a plurality of aggregated particles 93 attached on the base film 91 can be formed.

(Second embodiment of the present invention)
The protective layer 9 in the second embodiment of the present invention comprises nanocrystal particles used for the underlayer 91 of the first embodiment, and aggregated particles 93 discretely attached to the underlayer 91. It forms with the mixed single layer film (henceforth the particle layer 95).

  Specifically, first, a vehicle is prepared by mixing 60% by weight of terpineol, 30% by weight of butyl carbitol acetate, and 10% by weight of acrylic resin EMB-001 manufactured by Mitsubishi Rayon. Then, the nanocrystal particles having an average particle size of 10 nm or more and 100 nm or less and the agglomerated particles 93 having an average particle size of 0.9 μm to 2.5 μm are kneaded and dispersed so as to have a weight distribution equivalent to that of the preceding vehicle. Create a paste. This is applied onto a substrate by screen printing or the like, dried at 100 ° C. to 120 ° C. for 60 minutes, and baked at 340 ° C. to 360 ° C. for 60 minutes to form the particle layer 95.

  The particle layer 95 thus formed can greatly reduce the adsorption of impurity gases such as moisture without impairing the visible light transmittance as in the case of the base layer 91 of the first embodiment. Since the crystal particles 92 have aggregated particles 93 in which several crystal particles 92 are aggregated, high electron emission performance can be ensured while suppressing damage to the partition walls 14. Furthermore, in the formation of the protective layer 9, the number of production processes can be reduced, and the manufacturing cost can be suppressed.

  Note that the blending with the solvent described above is not limited to this, and the same effect can be obtained by applying the paste by a method such as slit coater.

  As described above, the electron emission capability and the charge retention capability of the PDP having the protective layer according to the present invention were evaluated. As a result, it was confirmed that both the evaluation index calculated from the statistical delay and the Vscn lighting voltage can satisfy the standard that the image display quality is good. That is, by implementing the present invention, it is possible to realize a PDP having high definition and high luminance display performance and low power consumption. Further, by using the nanocrystalline particle film as the base film 91, the impurity gas adsorbed on the protective layer 9 can be reduced, and the effect of maintaining the electron emission performance of the aggregated particles 93 for a long period can be obtained.

  In the embodiment of the present invention, magnesium oxide crystal particles are used as the single crystal particles. However, other single crystal particles have Sr, Ca, Ba, and Al having high electron emission performance similar to magnesium oxide. Since the same effect can be obtained even if crystal particles made of a metal oxide such as the above are used, the particle type is not limited to magnesium oxide.

  As described above, the present invention is useful for realizing a PDP having high-definition and high-luminance display performance and low power consumption.

1 PDP
2 Front plate 3 Front glass substrate 4 Scan electrode 4a, 5a Transparent electrode 4b, 5b Metal bus electrode 5 Sustain electrode 6 Display electrode 7 Black stripe (light shielding layer)
DESCRIPTION OF SYMBOLS 8 Dielectric layer 9 Protective layer 10 Back plate 11 Back glass substrate 12 Address electrode 13 Base dielectric layer 14 Partition 15 Phosphor layer 16 Discharge space 91 Base film 92 Crystal particle 93 Aggregated particle

Claims (4)

A front plate in which a dielectric layer is formed so as to cover a display electrode formed on a substrate and a protective layer is formed on the dielectric layer, and the front plate is disposed so as to face each other so as to form a discharge space. An address electrode is formed in a direction intersecting with the electrode and a back plate provided with a partition wall for partitioning the discharge space, and the protective layer is formed of a paste containing nanocrystal particles and containing water or ethanol A plasma display panel characterized by being made. The plasma display panel according to claim 1, wherein the content of water or ethanol is 1 wt% to 10 wt%. 3. The plasma display panel according to claim 1, wherein an average particle diameter of the nanocrystal particles is 10 nm or more and 100 nm or less. A paste for forming a protective layer of a plasma display panel, comprising nanocrystal particles having an average particle diameter of 10 nm to 100 nm and water or ethanol.

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