KR20080032474A - Dielectric composition, plasma display panel and method for manufacturing same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric composition, a plasma display panel using the same, and a method of manufacturing the same, including 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, and _{2 to 10} mol% SiO _2. The present invention relates to a dielectric composition containing 0 to ₁₀ mol% of V ₂ O ₅ and 0.5 to 20 mol% of alkali, a plasma display panel using the same, and a method of manufacturing the same. Since the present invention does not use Pb in the dielectric composition which becomes the mother glass powder, it is free from environmental regulation and can prevent glass crystallization by the use of alkali material. It can be used as a material.

Description

Dielectric composition and plasma display panel using same and manufacturing method therefor {DIELECTRIC COMPOSITION AND PLASMA DISPLAY PANEL USING THE SAME, MANUFACTURING METHOD THEREOF}

1 is a perspective view illustrating a discharge cell structure of a conventional plasma display panel.

2 is a cross-sectional view illustrating a plasma display panel according to Embodiment 1 of the present invention.

3 is a cross-sectional view illustrating a plasma display panel according to a second embodiment of the present invention.

4 is a cross-sectional view illustrating a plasma display panel according to a third embodiment of the present invention.

5 is a cross-sectional view illustrating a plasma display panel according to a fourth embodiment of the present invention.

6 is a cross-sectional view illustrating a plasma display panel according to a fifth embodiment of the present invention.

7A to 7D are graphs illustrating X-ray diffraction (XRD) according to Examples 6 to 12 of the present invention.

8 is a schematic block diagram illustrating a method of manufacturing a plasma display panel according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 11: 1st board | substrate (upper) 2, 12: 2nd board | substrate (lower)

3, 13: partition 4, 14: second dielectric layer (lower)

5, 15: phosphor 6, 16: first dielectric layer (top)

7, 17: protective layer 18: sealing part

9, 19: sustain electrode pair X, X1: address electrode

The present invention relates to a dielectric composition, a plasma display panel using the same, and a method of manufacturing the same.

Plasma Display Panels (PDPs), which are emerging as flat panel display devices with the highest potential to lead the next-generation flat panel display market, are usually He + Xe, Ne + in discharge cells partitioned by partition walls. 147 nm vacuum ultraviolet rays generated when an inert mixed gas such as Xe, He + Xe + Ne are discharged to emit an phosphor to display an image. Such a plasma display panel is a display device that is attracting attention as a large area flat panel display due to its easy thin and large size.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type plasma display panel includes a sustain electrode pair 9 formed on an upper glass substrate 1, an upper dielectric 6 formed on the sustain electrode pair 9, and a discharge electrode. On the protective layer 7 formed on the upper dielectric 6, the address electrode X formed on the lower substrate 2, the lower dielectric 4 formed on the address electrode X, and the lower dielectric 4. The formed partition 3 is provided.

Each of the sustain electrode pairs 9 has a transparent electrode 9a such as indium tin oxide (ITO), a line width smaller than the line width of the transparent electrode 9a, and one edge of the transparent electrode 9a. It includes a metal bus electrode (9b) formed in. The metal bus electrode 9b is formed through an ashing process after stacking Cr / Cu / Cr by vapor deposition. The upper dielectric 6 and the protective film 7 are laminated on the upper substrate 1 on which the sustain electrode pairs 9 are formed by screen printing or vacuum deposition. The upper dielectric 6 accumulates wall charges generated during plasma discharge to maintain the discharge, and serves to prevent the electrode damage of the sustain electrode pair 9 due to ion sputtering by acting as a diffusion barrier for sputtering ions during plasma discharge. do. The protective layer 7 is formed on the upper dielectric layer 6 to a thickness of approximately 5000 Å to prevent damage to the upper dielectric layer 6 and the sustain electrode pair 9 due to sputtering generated during plasma discharge. This increases the emission efficiency of the secondary electrons. As the protective layer 7, magnesium oxide (MgO) is usually used.

The lower dielectric 4 and the partition 3 are formed on the lower substrate 2 on which the address electrode X is formed, and the phosphor 5 is formed on the surfaces of the lower dielectric 4 and the partition 3 by a screen printing process. do. The phosphor 5 is excited by vacuum ultraviolet rays (VUV) generated during plasma discharge of the mixed gas injected into the discharge cells to generate visible light of any one of red, green, and blue. The address electrode 2 is formed to intersect with the sustain electrode pair 9. The partition 3 is formed by a screen printing process, a mold method, or the like. The partition wall 3 maintains discharge by forming wall charges and improves luminous efficiency by reflecting visible light emitted from the phosphor 5. In addition, the barrier rib 3 prevents electrical and optical cross talk between cells, thereby preventing the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells. The lower dielectric 4 improves the luminous efficiency of the plasma display panel by reflecting back visible light radiated backward from the phosphor 5 and serves as a base layer of the partition wall 3. At the same time, the lower dielectric 4 serves as a diffusion barrier for preventing the electrode material constituting the address electrode X from being diffused into the phosphor 5.

Here, the method of forming the upper dielectric (6) is about 40,000 cps by mixing 20-30 mol% of organic binder in borosilicate glass powder of 1 ~ 2㎛ sized grains containing about 60mol% or more of Pb. After having the viscosity, the entire surface is coated on the upper glass substrate 1 on which the sustain electrode pairs 9 are formed by screen printing, and then fired at a temperature of 550 to 580 ° C. The dielectric constant of the upper dielectric 6 has a value ranging from 14 to 16, and exhibits a light transmittance that transmits about 70% of visible light at 550 nm, the central wavelength. In order to form the lower dielectric 4 and the partition wall 3, first, a fine powder oxide such as TiO ₂ and Al ₂ O ₃ in a fine glass powder containing about 60 mol% or more of PbO is mixed with an organic solvent. To add a paste having a viscosity of about 40,000cps. After the paste is prepared as described above, the entire surface is coated with a thickness of 20 to 25 μm on the lower glass substrate 2 on which the address electrode X is formed by screen printing. Dielectric 4 is formed. Thereafter, the paste is completely coated on the lower dielectric 4 to a thickness of 120 to 200 μm, and the barrier ribs 3 are formed by baking after forming the barrier rib pattern through screen printing, sand blasting, molding, or the like. Here, the fine powder oxide improves the reflection characteristics of the partition 3 and the lower dielectric 4, adjusts the dielectric constant, and secures impact resistance.

In the plasma display panel, the high distortion glass of the PD-200 is used as the upper substrate and the lower substrate, but the use of soda-lime glass has been actively considered. This is because soda-lime glass is about 1/6 times cheaper than PD-200, which is advantageous in terms of unit cost. Therefore, studies on the use of soda-lime glass substrates have been actively conducted to improve the price competitiveness of the overall plasma display panel.

On the other hand, as described above, a material containing lead (Pb) was used for the dielectric layer formed on the upper substrate. However, as problems such as environmental pollution due to Pb are emerging, regulations on Pb-containing materials are being reinforced day by day. Accordingly, research into a composition capable of replacing Pb-containing materials as a dielectric composition for plasma display panels has been actively conducted, and bismuth (Bi) based dielectric compositions and zinc (Zn) based dielectric compositions are widely known.

Among them, the Bi-based dielectric composition is different in degree, but also causes environmental pollution, and more problematic is that the unit price is high. On the other hand, Zn-based dielectric compositions are not only free from environmental pollution but also have a 50% price advantage over Bi-based dielectric compositions. Therefore, the research needs to be more actively conducted than Bi-based dielectric compositions.

However, since the Zn-based dielectric composition has a high vitrification temperature, there is a problem that the soda-lime glass substrate is not suitable for the dielectric firing conditions. That is, since the soda-lime glass substrate mainly used as the substrate for the plasma display panel because of the unit price is advantageous, heat deformation occurs when heated to about 550 ° C. or higher.

However, since the Zn-based dielectric composition has a vitrification temperature of more than 550 ° C., the thermal deformation of the soda-lime glass substrate during the firing process due to the temperature necessary for the firing process that is essential for forming the dielectric layer, that is, the firing temperature higher than 550 ° C. There was a problem that this occurs and there was a problem that the glass crystallization phenomenon occurs depending on the material added to solve this problem.

The present invention is to solve the above-mentioned problems, an object of the present invention to provide a dielectric composition that can be produced at a low firing temperature, to provide a plasma display panel using the same and a method of manufacturing the same.

In addition, another object of the present invention is to provide a dielectric composition which does not contain Pb and is free from environmental pollution and can be manufactured at low cost, and provides a plasma display panel and a method of manufacturing the same.

Another object of the present invention is to provide a dielectric composition in which glass crystallization does not occur, and to provide a plasma display panel and a method of manufacturing the same.

Accordingly, another object of the present invention is to provide a dielectric composition for improving the image quality of a plasma display panel, and to provide a plasma display panel and a method of manufacturing the same.

Dielectric composition according to an embodiment of the present invention for achieving the above object is 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, _{2 to 10} mol% SiO ₂ , It is characterized in that it contains a matrix glass powder containing 0 to ₁₀ mol% V ₂ O ₅ and 0.5 to 20 mol% alkali.

According to another aspect of the present invention, there is provided a plasma display panel including a first substrate on which a first dielectric is formed, a second substrate on which a second dielectric is formed, and a space between the first substrate and the second substrate. Wherein the first and second dielectrics, the partition and the seal are 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, and 2 to 10 mol% SiO. ₂ , 0 to 10 mol% of V ₂ O ₅ and 0.5 to 20 mol% of the base glass powder containing an alkali characterized in that it is prepared using.

According to another aspect of the present invention, there is provided a method of manufacturing a plasma display panel, including a first electrode, a first substrate having a first dielectric, a second electrode, a second dielectric, a partition, and sealing. Preparing a second substrate having parts, 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, _{2 to 10} mol% SiO ₂ , 0 to 10 mol% V ₂ O Preparing a paste by mixing ₅ and 0.5-20 mol% of alkali-containing glass powder and a vehicle, and baking the paste to form at least one of the first, second dielectric, partition and sealing portion. Characterized in that it comprises a.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the accompanying drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity, and the thickness ratios of the layers in the drawings do not represent actual thickness ratios. On the other hand, when a part such as a layer, film, region, plate, etc. is formed or positioned on another part, it is formed directly on the other part and not only in direct contact but also when another part exists in the middle thereof It should also be understood to include.

Here, the first substrate is an upper substrate of a plasma display panel in which a sustain electrode pair consisting of a transparent electrode and a bus electrode, an upper dielectric layer, and a passivation layer are sequentially formed, and the second substrate is an address electrode and a lower dielectric layer for generating a discharge electrode pair and a discharge electrode. The lower substrate of the plasma display panel is sequentially formed, and the electrode and dielectric provided in the first substrate are referred to as the first electrode and the first dielectric, and the electrode and dielectric provided in the second substrate are similar to the second electrode. It will be referred to as a second dielectric.

2 is a cross-sectional view illustrating a plasma display panel according to Embodiment 1 of the present invention.

As shown in FIG. 2, the plasma display panel according to Embodiment 1 of the present invention includes a first dielectric 16 that is a transparent dielectric. The basic composition of the first dielectric 16, which is an upper dielectric, uses a ZnO-B ₂ O ₃ -BaO composition. The dielectric composition according to the present invention is stable by mixing alkali, SiO ₂ , V ₂ O ₅ in an appropriate amount of the mixture of ZnO-B ₂ O ₃ -BaO to form a base glass powder that is stable at low temperatures (below 520 ° C.). To provide a dielectric composition comprising, the specific composition ratio is shown in Table 1 below.

Referring to Table 1, the dielectric composition used for the first dielectric 16, which is the upper dielectric of the plasma display panel according to the first embodiment of the present invention, 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, _{2 to 10} mol% SiO ₂ , 0 to ₁₀ mol% V ₂ O ₅ and 0.5 to 20 mol% alkali, wherein the molar ratio of B ₂ O ₃ to ZnO is 0.8 to 1.3.

The composition is mixed with a vehicle in a powder state having a particle size of 1 to 1.5 µm, made of a dielectric paste having a viscosity of 40,000 to 60,000 cps, and then coated on the first substrate 11 and baked at a temperature of 520 ° C. or less. Through the first dielectric 16 is completed.

The dielectric paste is a mixture of 70 to 90 wt% of the powdered dielectric composition and 10 to 30 wt% of the vehicle. In this case, the vehicle is mixed with 0 to 15 wt% binder, 0 to 80 wt% solvent, 0 to 5 wt% dispersant and the like to assist in mixing or printing powders.

Here, the ZnO added at 30-50 mol% not only plays a role of lowering the coefficient of thermal expansion and the vitrification temperature while increasing the vitrification forming ability, and also the orange light generated by the discharge of Ne of the discharge gas injected into the internal space of the plasma display panel. The absorption may be prevented to reduce the color purity of the plasma display panel.

The B ₂ O ₃ added at 10 to 50 mol% is generally added as a flux for promoting a solid phase reaction, but there is a disadvantage in that the glass forming ability is improved to improve the vitrification temperature, thereby adding an appropriate amount of composition ratio.

The BaO added at 5 to 30 mol% acts as an alkaline earth and acts as a tree planting agent, and when a certain amount is added, it lowers the vitrification temperature, but when added in excess (10 mol% or more), it causes crystallization.

The SiO ₂ added at 2-10 mol% is added to prevent crystallization.

V ₂ O ₅ added at 0-10 mol% lowers the vitrification temperature and serves to form stable glass.

Alkali added at 0.5 to 20 mol% is specifically added 0 to 15 mol% of Li ₂ O, 0 to 10 mol% of Na ₂ O, and acts as a tree planting agent as alkaline earth. Therefore, when a predetermined amount is added, the vitrification temperature is lowered, but when it is contained in an excessive amount, it causes devitrification, so that an appropriate composition ratio is added as described above.

In addition, in order to facilitate mixing or printing of the powders in the dielectric composition and to prevent crystallization, 0 to 10 mol% of Al ₂ O ₃ may be further added.

3 is a cross-sectional view illustrating a plasma display panel according to a second embodiment of the present invention.

As shown in FIG. 3, the plasma display panel according to the second exemplary embodiment of the present invention includes a partition 13 which is an opaque dielectric. The basic composition of the dielectric composition applied to the partition 13 uses a ZnO-B ₂ O ₃ -BaO composition. The dielectric composition according to the present invention comprises a dielectric composition capable of baking at a low temperature (below 520 ° C.) while being stable by appropriately mixing alkali, SiO ₂ , V ₂ O ₅ in a mixture of ZnO-B ₂ O ₃ -BaO in an appropriate amount. To provide, the specific composition ratio is as shown in Table 2 below.

Referring to Table 2, the dielectric composition used for the partition 13, which is the dielectric of the plasma display panel according to the second embodiment of the present invention, 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, 2-10 mol% SiO ₂ , 0-10 mol% V ₂ O ₅ and 0.5-20 mol% alkali, wherein the molar ratio of B ₂ O ₃ to ZnO is 0.8-1.3 to be.

The composition is mixed with a vehicle in a powder state having a particle size of 1 to 1.5 μm, made of a dielectric paste having a viscosity of 40,000 to 60,000 cps, and then coated on the second substrate 12 and patterned, and then at a temperature of 520 ° C. or less. The partition 13 is completed through the process of baking.

In addition, the dielectric composition used for the partition wall 13 is 10-20 mol% Al ₂ O ₃ which is a high temperature stabilized ceramic filler or 10-20 mol% TiO _{2 which} is a high refractive index material and a filler are further mixed.

The dielectric paste is a mixture of 70 to 90 wt% of the powdered dielectric composition and 10 to 30 wt% of the vehicle. In this case, the vehicle is mixed with 0 to 15 wt% binder, 0 to 80 wt% solvent, 0 to 5 wt% dispersant and the like to assist in mixing or printing powders.

Here, the ZnO added at 30-50 mol% not only plays a role of lowering the coefficient of thermal expansion and the vitrification temperature while increasing the vitrification forming ability, and also the orange light generated by the discharge of Ne of the discharge gas injected into the internal space of the plasma display panel. The absorption may be prevented to reduce the color purity of the plasma display panel.

The B ₂ O ₃ added at 10 to 50 mol% is generally added as a flux for promoting a solid phase reaction, but there is a disadvantage in that the glass forming ability is improved to improve the vitrification temperature, thereby adding an appropriate amount of composition ratio.

The BaO added at 5 to 30 mol% acts as an alkaline earth and acts as a tree planting agent, and when a certain amount is added, it lowers the vitrification temperature, but when added in excess (10 mol% or more), it causes crystallization.

The SiO ₂ added at 2-10 mol% is added to prevent crystallization.

V ₂ O ₅ added at 0-10 mol% lowers the vitrification temperature and serves to form stable glass.

Alkali added at 0.5 to 20 mol% is specifically added 0 to 15 mol% of Li ₂ O, 0 to 10 mol% of Na ₂ O, and acts as a tree planting agent as alkaline earth. Therefore, when a predetermined amount is added, the vitrification temperature is lowered, but when it is contained in an excessive amount, it causes devitrification, so that an appropriate composition ratio is added as described above.

4 is a cross-sectional view illustrating a plasma display panel according to a third embodiment of the present invention.

As shown in FIG. 4, the plasma display panel according to Embodiment 3 of the present invention includes a second dielectric 14, which is an opaque dielectric. The basic composition of the dielectric composition applied to the second dielectric 14, which is the lower dielectric, uses a ZnO-B ₂ O ₃ -BaO composition. The dielectric composition according to the present invention provides a dielectric composition stably and calcinable at a low temperature (below 520 ° C.) by appropriately mixing alkali, SiO ₂ , V ₂ O ₅ in a mixture of ZnO-B ₂ O ₃ -BaO in an appropriate amount. It is intended that the specific composition ratio is as shown in Table 3 below.

Referring to Table 3, the dielectric composition used for the second dielectric 14, which is the lower dielectric of the plasma display panel according to Embodiment 3 of the present invention, is 20 to 60 mol% ZnO and 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, _{2 to 10} mol% SiO ₂ , 0 to ₁₀ mol% V ₂ O ₅ and 0.5 to 20 mol% alkali, wherein the molar ratio of B ₂ O ₃ to ZnO is 0.8 to 1.3.

The composition is mixed with a vehicle in a powder state having a particle size of 1 to 1.5 µm, made of a dielectric paste having a viscosity of 40,000 to 60,000 cps, and then coated on the second substrate 12 and baked at a temperature of 520 ° C. or less. The partition 13 is completed through.

In addition, the dielectric composition used for the second dielectric 14 is 10-20 mol% Al ₂ O ₃ which is a high temperature stabilized ceramic filler or 10-20 mol% TiO _{2 which} is a high refractive index material and a filler is further mixed.

The dielectric paste is a mixture of 70 to 90 wt% of the powdered dielectric composition and 10 to 30 wt% of the vehicle. In this case, the vehicle is mixed with 0 to 15 wt% binder, 0 to 80 wt% solvent, 0 to 5 wt% dispersant and the like to assist in mixing or printing powders.

Here, the ZnO added at 30-50 mol% not only plays a role of lowering the coefficient of thermal expansion and the vitrification temperature while increasing the vitrification forming ability, and also the orange light generated by the discharge of Ne of the discharge gas injected into the internal space of the plasma display panel. The absorption may be prevented to reduce the color purity of the plasma display panel.

The B ₂ O ₃ added at 10 to 50 mol% is generally added as a flux for promoting a solid phase reaction, but there is a disadvantage in that the glass forming ability is improved to improve the vitrification temperature, thereby adding an appropriate amount of composition ratio.

The BaO added at 5 to 30 mol% acts as an alkaline earth and acts as a tree planting agent, and when a certain amount is added, it lowers the vitrification temperature, but when added in excess (10 mol% or more), it causes crystallization.

The SiO ₂ added at 2-10 mol% is added to prevent crystallization.

V ₂ O ₅ added at 0-10 mol% lowers the vitrification temperature and serves to form stable glass.

Alkali added at 0.5 to 20 mol% is specifically added 0 to 15 mol% of Li ₂ O, 0 to 10 mol% of Na ₂ O, and acts as a tree planting agent as alkaline earth. Therefore, when a predetermined amount is added, the vitrification temperature is lowered, but when it is contained in an excessive amount, it causes devitrification, so that an appropriate composition ratio is added as described above.

5 is a cross-sectional view illustrating a plasma display panel according to a fourth embodiment of the present invention.

As shown in FIG. 5, the plasma display panel according to Embodiment 4 of the present invention includes an encapsulation portion 18 which is an opaque dielectric. The basic composition of the dielectric composition applied to the sealing portion 18 uses a ZnO-B ₂ O ₃ -BaO composition. The dielectric composition according to the present invention comprises a dielectric composition capable of baking at a low temperature (below 520 ° C.) while being stable by appropriately mixing alkali, SiO ₂ , V ₂ O ₅ in a mixture of ZnO-B ₂ O ₃ -BaO in an appropriate amount. To provide, the specific composition ratio is as shown in Table 4 below.

Referring to Table 4, the dielectric composition used for the sealing portion 18, which is the dielectric of the plasma display panel according to the fourth embodiment of the present invention, 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 30 mol% BaO, 2-10 mol% SiO ₂ , 0-10 mol% V ₂ O ₅ and 0.5-20 mol% alkali, wherein the molar ratio of B ₂ O ₃ to ZnO is 0.8- 1.3.

The composition is mixed with a vehicle in a powder state having a particle size of 1 to 1.5 μm, made of a dielectric paste having a viscosity of 40,000 to 60,000 cps, and then coated on the second substrate 12 and patterned, and then at a temperature of 520 ° C. or less. The sealing part 18 is completed through the process of baking.

In addition, the dielectric composition used in the encapsulation portion 18 is 10-20 mol% of Al ₂ O ₃ or a filler and 10-20 mol% of TiO 2, which is a high refractive index material, is further mixed.

The dielectric paste is a mixture of 70 to 90 wt% of the powdered dielectric composition and 10 to 30 wt% of the vehicle. In this case, the vehicle is mixed with 0 to 15 wt% binder, 0 to 80 wt% solvent, 0 to 5 wt% dispersant and the like to assist in mixing or printing powders.

Here, the ZnO added at 30-50 mol% not only plays a role of lowering the coefficient of thermal expansion and the vitrification temperature while increasing the vitrification forming ability, and also the orange light generated by the discharge of Ne of the discharge gas injected into the internal space of the plasma display panel. The absorption may be prevented to reduce the color purity of the plasma display panel.

The B ₂ O ₃ added at 10 to 50 mol% is generally added as a flux for promoting a solid phase reaction, but there is a disadvantage in that the glass forming ability is improved to improve the vitrification temperature, thereby adding an appropriate amount of composition ratio.

The BaO added at 5 to 30 mol% acts as an alkaline earth and acts as a tree planting agent, and when a certain amount is added, it lowers the vitrification temperature, but when added in excess (10 mol% or more), it causes crystallization.

The SiO ₂ added at 2-10 mol% is added to prevent crystallization.

V ₂ O ₅ added at 0-10 mol% lowers the vitrification temperature and serves to form stable glass.

Alkali added at 0.5 to 20 mol% is specifically added 0 to 15 mol% of Li ₂ O, 0 to 10 mol% of Na ₂ O, and acts as a tree planting agent as alkaline earth. Therefore, when a predetermined amount is added, the vitrification temperature is lowered, but when it is contained in an excessive amount, it causes devitrification, so that an appropriate composition ratio is added as described above.

6 is a cross-sectional view illustrating a plasma display panel according to a fifth embodiment of the present invention.

As shown in FIG. 6, the plasma display panel according to Embodiment 5 of the present invention includes a first dielectric 16, a partition 13, a second dielectric 14, and an encapsulation 18, which are transparent dielectrics. . The basic composition of the dielectric composition used for the first dielectric 16 as the upper dielectric, the partition 13 as the dielectric, the second dielectric 14 as the lower dielectric, and the sealing portion 18 as the dielectric is ZnO-B ₂ O ₃ -BaO composition is used. The dielectric composition according to the present invention comprises a dielectric composition capable of baking at a low temperature (below 520 ° C.) while being stable by appropriately mixing alkali, SiO ₂ , V ₂ O ₅ in a mixture of ZnO-B ₂ O ₃ -BaO in an appropriate amount. To provide, the specific composition ratio is as shown in Table 5 below.

Referring to Table 5, a dielectric composition used for the first dielectric 16, the partition 13, the second dielectric 14, and the sealing portion 18, which are the upper dielectrics of the plasma display panel according to the fifth embodiment of the present invention. Silver is 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, _{2 to 10} mol% SiO ₂ , 0 to ₁₀ mol% V ₂ O ₅ and 0.5 to 20 mol% alkali And a molar ratio of B ₂ O ₃ to ZnO is 0.8 to 1.3.

The composition used for the first dielectric 16 is mixed with a vehicle in a powder state having a particle size of 1 to 1.5 µm, made of a dielectric paste having a viscosity of 40,000 to 60,000 cps, and then completely coated on the first substrate 11. The first dielectric 16 is completed through a step of firing at a temperature of 520 ° C. or lower.

The composition used for the partition 13, the second dielectric 14 and the sealing portion 18 is mixed with the vehicle in a powder state having a particle size of 1 ~ 1.5㎛ made of a dielectric paste having a viscosity of 40,000 ~ 60,000cps, After the entire surface is coated on the substrate 12 and patterned, the partition wall 13, the second dielectric 14, and the sealing unit 18 are completed through a process of firing at a temperature of 520 ° C. or lower.

In addition, the dielectric composition used for the partition 13, the second dielectric 14, and the sealing portion 18 is 10-20 mol% of Al ₂ O ₃ or a filler, which is a high temperature stabilized ceramic filler, and 10-20 mol, which is a high refractive index material. % TiO ₂ is further mixed.

Here, the ZnO added at 30-50 mol% not only plays a role of lowering the coefficient of thermal expansion and the vitrification temperature while increasing the vitrification forming ability, and also the orange light generated by the discharge of Ne of the discharge gas injected into the internal space of the plasma display panel. The absorption may be prevented to reduce the color purity of the plasma display panel.

The B ₂ O ₃ added at 10 to 50 mol% is generally added as a flux for promoting a solid phase reaction, but there is a disadvantage in that the glass forming ability is improved to improve the vitrification temperature, thereby adding an appropriate amount of composition ratio.

The BaO added at 5 to 30 mol% acts as an alkaline earth and acts as a tree planting agent, and when a certain amount is added, it lowers the vitrification temperature, but when added in excess (10 mol% or more), it causes crystallization.

The SiO ₂ added at 2-10 mol% is added to prevent crystallization.

V ₂ O ₅ added at 0-10 mol% lowers the vitrification temperature and serves to form stable glass.

Alkali added at 0.5 to 20 mol% is specifically added 0 to 15 mol% of Li ₂ O, 0 to 10 mol% of Na ₂ O, and acts as a tree planting agent as alkaline earth. Therefore, when a predetermined amount is added, the vitrification temperature is lowered, but when it is contained in an excessive amount, it causes devitrification, so that an appropriate composition ratio is added as described above.

Hereinafter, embodiments 6 to 12 of the present invention will be described in detail.

Example  6

In order to prepare the dielectric composition according to the present invention, each material was mixed at a composition ratio of 46 mol% ZnO, 40 mol% B ₂ O ₃ , 8 mol% BaO, and 6 mol% SiO ₂ . Experimental value of 58 was obtained at 545 ° C., and the X-ray diffraction (XRD) was measured for this composition. As a result, a graph as shown in FIG. 7A was obtained.

As shown in FIG. 7A, the XRD result graph for the composition of Example 6 shows that crystallization peaks were generated at various diffraction angles. This crystallization will have a significant effect on light transmittance.

Example  7

In order to prepare the dielectric composition according to the present invention, each material was mixed at a composition ratio of 46 mol% ZnO, 40 mol% B ₂ O ₃ , 8 mol% BaO, 6 mol% SiO ₂ , and 2 mol% V ₂ O ₅ . For this composition, an experimental value of 530 ° C. and a coefficient of thermal expansion of 53 was obtained. The X-ray diffraction (XRD) of the composition was measured, and a graph as shown in FIG. 7A was obtained.

As shown in FIG. 7A, XRD results of the composition of Example 7 show that crystallization peaks are generated at various diffraction angles. This crystallization will have a significant effect on light transmittance.

Example  8

In order to prepare the dielectric composition according to the present invention, each material was mixed at a composition ratio of 46 mol% ZnO, 40 mol% B ₂ O ₃ , 8 mol% BaO, 6 mol% SiO ₂ , and 5 mol% V ₂ O ₅ . For this composition, an experimental value of vitrification temperature of 510 ° C. and a thermal expansion coefficient of 67 was obtained. As a result of measuring XRD (X-ray Diffraction) of this composition, a graph as shown in FIG. 7B was obtained.

As shown in FIG. 7B, XRD results for the composition of Example 8 show that no crystallization peak occurs at various diffraction angles in the graph. Therefore, it can be seen that crystallization does not occur, and that the vitrification temperature also fell below 520 ° C.

Example  9

In order to prepare the dielectric composition according to the present invention, each material was mixed at a composition ratio of 44 mol% ZnO, 37 mol% B ₂ O ₃ , 6 mol% BaO, 6 mol% SiO ₂ , 7 mol% V ₂ O ₅ . For this composition, an experimental value of vitrification temperature of 460 ° C. and a coefficient of thermal expansion of 75 was obtained. XRD (X-ray Diffraction) of the composition was measured, and a graph as shown in FIG. 7B was obtained.

As shown in FIG. 7B, XRD results for the composition of Example 9 show that no crystallization peak occurs at various diffraction angles in the graph. Therefore, it can be seen that crystallization does not occur, and that the vitrification temperature also fell below 520 ° C.

Example  10

Composition ratio of 43 mol% ZnO, 35 mol% B ₂ O ₃ , 6 mol% BaO, 6 mol% SiO ₂ , 10 mol% Na ₂ O, 5 mol% V ₂ O ₅ to prepare the dielectric composition according to the present invention As a result of mixing the materials with each other, an experimental value of 450 ° C. and a coefficient of thermal expansion of 90 ° C. was obtained. The X-ray diffraction (XRD) of the composition was measured. Could get

As shown in FIG. 7C, XRD results for the composition of Example 10 show that no crystallization peaks occurred at various diffraction angles in the graph. Therefore, it can be seen that crystallization does not occur, and that the vitrification temperature also fell below 520 ° C.

Example  11

In order to prepare the dielectric composition according to the present invention, each material is mixed with a composition ratio of ₂₉ mol% ZnO, 43 mol% B ₂ O ₃ , 13 mol% SiO ₂ , 15 mol% Li ₂ O, 2 mol% V ₂ O ₅ . As a result, an experimental value of a glass temperature of 450 ° C. and a coefficient of thermal expansion of 76 was obtained for this composition, and XRD (X-ray Diffraction) was measured for this composition. Thus, a graph as shown in FIG. 7D was obtained.

As shown in FIG. 7D, XRD results for the composition of Example 10 showed that the crystallization peaks were generated at various diffraction angles in the graph. Thus, it can be seen that crystallization has occurred. This crystallization will have a significant effect on light transmittance.

Example  12

In order to prepare the dielectric composition according to the present invention, each material is mixed with a composition ratio of ₂₉ mol% ZnO, 43 mol% B ₂ O ₃ , 13 mol% SiO ₂ , 15 mol% Li ₂ O, 5 mol% V ₂ O ₅ . As a result, an experimental value of 440 DEG C and a coefficient of thermal expansion of 79 was obtained for the composition, and XRD (X-ray Diffraction) was measured for this composition.

As shown in FIG. 7E, XRD results for the composition of Example 12 show that no crystallization peaks occurred at various diffraction angles in the graph. Therefore, it can be seen that crystallization does not occur, and that the vitrification temperature also fell below 520 ° C.

The above-described embodiments 6 to 12 are for character by the addition of V ₂ O _5, prevent the crystallization and to obtain a dielectric composition for stable plasma display having a low sintering temperature, the sum of the composition except for the V ₂ O ₅ is 100mol% to be. Since the vitrification temperature can be lowered depending on whether V ₂ O ₅ is added or not, the firing step can be performed at 520 ° C. or lower. And it was confirmed that the occurrence of crystallization can be prevented as in the experiment. In addition, since an opaque film is provided due to the inherent color of V ₂ O ₅ , it can be used not only as a material for forming partition walls but also as a material for forming sealing portions in plasma displays.

8 is a schematic block diagram illustrating a method of manufacturing a plasma display panel according to an embodiment of the present invention.

As shown in FIG. 8, a step 81 of preparing a second substrate having a first electrode, a first substrate having a first dielectric, and a second substrate having a second electrode, a second dielectric, a partition, and a sealing portion, 20 to 60 mol Dielectric composition comprising% ZnO, 10-50 mol% B ₂ O ₃ , 5-30 mol% BaO, 2-10 mol% SiO ₂ , 0-10 mol% V ₂ O ₅ and 0.5-20 mol% alkali Mixing the vehicle with a vehicle to produce a paste (82), applying the paste onto a substrate (83), and baking the paste to form at least one of the first, second dielectric, barrier ribs, and sealing portions. And step 84.

Here, the step (82) of preparing the paste first melts the dielectric composition (glass) mixed at the above-described composition ratio at high temperature, and then immersed in water at room temperature or quenched dry using twin rolls and then pulverized with a grinder. If necessary, by mixing with a filler (dryer) and dried, a mother glass powder can be produced.

Next, 70 to 90 wt% of the parent glass powder prepared as described above and 10 to 30 wt% of vehicle are mixed. In this case, the vehicle may be mixed with 0 to 15 wt% binder, 0 to 80 wt% solvent, 0 to 5 wt% dispersant and the like to assist in mixing or printing the powders. At this time, the solvent may be used alcohol, glycol, propylene glycol ether, propylene glycol acetate, ketone, BCA, Xylene, Terpineol, Texanol, water, etc., the dispersant Acryl system having a large dispersing effect The dispersant is mainly used.

Applying the paste onto a substrate (93) is a front surface of a layer capable of forming at least one of the first, second dielectrics, barrier ribs and seals by at least one of screen printing, dispensing and inkjet printing. It is applied to and fired at a temperature of 540 ℃ or less to form any one selected from the first, the second dielectric, the partition wall and the sealing portion. Application of the paste for forming the encapsulation portion may be performed by applying on one of the substrate selected from the first and second substrates.

As described above, the dielectric composition according to the embodiment of the present invention, the plasma display panel using the same, and a method of manufacturing the same can be used in combination with a low cost soda-lime glass substrate and a ZnO-B ₂ O ₃ -BaO composition. Therefore, the price competitiveness of the plasma display panel can be improved as a whole, and since Pb is not used, it is also free from environmental regulations.

In addition, according to the present invention, it was confirmed that the thermal expansion coefficient was not increased compared to the lowered vitrification temperature, and it was possible to prevent glass crystallization caused by the use of alkaline materials by adding V ₂ O ₅ and to allow low-temperature baking below 520 ° C. There is an effect that the development of the dielectric material is possible.

In addition, according to the present invention, since an opaque film due to the inherent color of V ₂ O ₅ is provided, there is an effect that it can be used as a dielectric layer, partition wall and sealing material for a plasma display.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (12)

20 to 60 mol% ZnO; 10-50 mol% B ₂ O ₃ ; 5-30 mol% BaO; _{2 to 10} mol% of SiO ₂ ; 0-10 mol% of V ₂ O ₅ ; And A dielectric composition comprising 0.5 to 20 mol% of alkali. The method of claim 1, wherein the dielectric composition, Dielectric composition, characterized in that the molar ratio of B ₂ O ₃ to ZnO is 0.8 to 1.3. The method of claim 1, wherein the alkali, A dielectric composition, characterized by 0 to 15 mol% Li ₂ O or 0 to 10 mol% Na ₂ O. The method of claim 1, wherein the dielectric composition, Dielectric composition, characterized in that it further comprises 0 to 10mol% Al ₂ O ₃ to prevent crystallization. A first substrate having a first dielectric formed thereon; A second substrate having a second dielectric formed thereon; A partition and an encapsulation portion positioned between the first substrate and the second substrate, The first and second dielectrics, partitions and seals are 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, _{2 to 10} mol% SiO ₂ , 0 to 10 mol% V ₂ A plasma display panel manufactured using a dielectric composition containing O ₅ and an alkali of 0.5 to 20 mol%. The method of claim 5, wherein the first and second dielectrics, barrier ribs and sealing portion, And a molar ratio of B ₂ O ₃ to ZnO is 0.8 to 1.3. The method of claim 5, wherein the alkali, A plasma display panel comprising 0 to 15 mol% of Li ₂ O and 0 to 10 mol% of Na ₂ O. The method of claim 5, wherein the first and second dielectrics, barrier ribs and sealing portion, Plasma display panel further comprises 0 to 10 mol% Al ₂ O ₃ to prevent crystallization. Preparing a first substrate having a first electrode, a first dielectric, and a second substrate having a second electrode, a second dielectric, a partition, and a seal; 20 to 60 mol% ZnO, 10 to 50 mol% B ₂ O ₃ , 5 to 30 mol% BaO, _{2 to 10} mol% SiO ₂ , 0 to ₁₀ mol% V ₂ O ₅ and 0.5 to 20 mol% alkali Mixing the prepared dielectric composition with a vehicle to produce a paste; Applying the paste onto a substrate; And Firing the paste to form at least one of the first, second dielectrics, barrier ribs, and encapsulation portions. The method of claim 9, wherein the dielectric composition, A method of manufacturing a plasma display panel, characterized in that 0 to 10 mol% Al ₂ O ₃ is further included to prevent crystallization. The method of claim 9, wherein the paste, A method of manufacturing a plasma display panel, comprising a composition ratio comprising 70 to 90 wt% of a powdered dielectric composition and 10 to 30 wt% of a vehicle. The method of claim 13, wherein the application of the paste, A method of manufacturing a plasma display panel using at least one of screen printing, dispensing, and inkjet printing.

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