KR20080080768A - Dielectric composition for plasma display panel and plasma display panel using same - Google Patents

Abstract

The present invention relates to a dielectric composition for a plasma display panel and a plasma display panel using the same, comprising 52 to 65 wt% PbO, 5 to 30 wt% B ₂ O ₃ , Dielectric composition comprising 0-25 wt% SiO ₂ , 0-5 wt% Al ₂ O ₃ , 0-15 wt% BaO, 0-10 wt% ZnO, and 0-15 wt% SrO and plasma display panel using the same It is about. According to the present invention, a low-cost soda-lime glass substrate and a low calcination temperature PbO dielectric composition are used together to provide high transmittance plasma display panel while preventing electrode yellowing with low temperature calcination below 520 ° C. Therefore, the overall price competitiveness of the plasma display panel can be improved.

Description

A dielectric composition for a plasma display panel and a plasma display panel using the same {{{ELITIVE COMPOSITION FOR PLASMA DISPLAY PANEL AND PLASMA DISPLAY PANEL USING THE SAME}}

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 schematic block diagram showing a method of manufacturing a plasma display panel according to Embodiment 9 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

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

The present invention relates to a dielectric composition for a plasma display panel and a plasma display panel using 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 the 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 wt% of organic binder into borosilicate glass powder having a size of 1 ~ 2㎛ size containing about 60wt% or more of Pb After having a viscosity, it is apply | coated whole to the upper glass substrate 1 in which the sustain electrode pair 9 was formed by the screen printing method, and baked at the temperature of 550-580 degreeC. 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, which is the center wavelength. In order to form the lower dielectric 4 and the partition wall 3, first, a fine powder oxide such as TiO ₂ , Al ₂ O _3, and several tens wt% of oxides containing about 60 wt% or more of PbO are mixed with an organic solvent. To add a paste having a viscosity of about 40,000 cps. 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 applied on the lower dielectric 4 again to a thickness of 120 to 200 µm, and after the partition pattern is formed by screen printing, sand blasting, mold method or the like, the partition wall 3 is formed. 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.

However, when the soda-lime glass substrate is used for the substrate of the plasma display panel, there is a problem that it does not meet the dielectric firing conditions.

That is, because of its high cost, the soda-lime glass substrate, which is mainly used as a substrate for a plasma display panel, is thermally deformed when heated to about 520 ° C. or higher, causing a decrease in the transmittance of the entire dielectric substrate due to the excess Pb content. Since yellowing of the electrode occurs, there is a problem in that the efficiency of the plasma display panel is lowered.

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

Another object of the present invention is to provide a dielectric composition for a plasma display panel having a high transmittance that does not cause electrode yellowing, and to provide a plasma display panel using the same.

The dielectric composition for a plasma display panel according to an embodiment of the present invention for achieving the above object, 52 to 65wt% PbO, 5 to 30wt% B ₂ O ₃ , 0 to 25wt% SiO ₂ , 0 It is characterized by having a composition ratio containing -5wt% Al ₂ O ₃ , 0-15wt% BaO, 0-10wt% ZnO, and 0-15wt% SrO.

According to an embodiment of the present invention, a plasma display panel includes a first substrate on which a first dielectric is formed, a second substrate on which a second dielectric is formed, and a gap between the first substrate and the second substrate. At least one of the first and second dielectrics and the partition wall includes 52 to 65 wt% PbO, 5 to 30 wt% B ₂ O ₃ , 0 to 25 wt% SiO ₂ , 0 to ₅ wt% Al ₂ O ₃ , 0 to ₁₅ wt% BaO, 0 to 10 wt% ZnO, and 0 to 15 wt% SrO.

According to an aspect of the present invention, there is provided a method of manufacturing a plasma display panel, which includes a first electrode, a first substrate having a first dielectric, a second electrode, a second dielectric, and a partition wall. 2 preparing a substrate, 52 to 65 wt% PbO, 5 to 30 wt% B ₂ O ₃ , A paste is prepared by mixing a dielectric composition with a vehicle comprising 0-25 wt% SiO ₂ , 0-5 wt% Al ₂ O ₃ , 0-15 wt% BaO, 0-10 wt% ZnO, and 0-15 wt% SrO. Manufacturing a metal, applying the paste onto a substrate, and baking the paste to form at least one of the first and second dielectrics and the partition wall.

Here, in the dielectric composition, the first and second dielectrics, and the barrier rib, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO is 0 to 5 wt% to suppress coloring of the composition and electrode reactivity. It has a composition ratio further included, or at least any one of CeO ₂ , Er ₂ O ₃ , Nd ₂ O ₃ , Pr ₂ O ₃ has a composition ratio further included in 0 to 10wt%.

In addition, at least one of the second dielectric and the partition wall may have a composition ratio further including 10 to ₂₀ wt% TiO _{2, which} is a filler of high refractive index, or a composition ratio further including 10 to 20 wt% Al ₂ O ₃ . Have

Here, the paste is mixed at a composition ratio of 70 to 90 wt% glass powder with a dielectric composition of 10 to 30 wt% vehicle, wherein the paste is applied by at least one of screen printing, dispensing, and ink jet method. .

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. On the other hand, when a part such as a layer, film, region, plate, etc. is formed or located on another part, it is formed directly on the other part and not only in direct contact but also another part in between It should also be understood to include cases.

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 first dielectric 16 includes PbO, B ₂ O ₃ , SiO ₂ , Al ₂ O ₃ , BaO, ZnO, and SrO, and the dielectric composition is stably mixed and calcinable at low temperatures (below 520 ° C.). To provide a specific composition ratio is as 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 Embodiment 1 of the present invention, is 52 to 65 wt% of PbO and 5 to 30 wt% of B ₂ O _3. , 0 to 25 wt% SiO ₂ , 0 to ₅ wt% Al ₂ O ₃ , 0 to ₁₅ wt% BaO, 0 to 10 wt% ZnO, and 0 to 15 wt% SrO.

The composition is mixed with a vehicle in a powder state having a particle size of 1 to 1.5 mu m, 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 캜 or lower. Through the first dielectric 16 is completed.

The dielectric paste is a mixture of a dielectric composition in a glass powder state of 70 to 90wt% and a vehicle of 10-30wt%. In this case, the vehicle may be mixed with 0 to 15wt% binder, 0 to 80wt% solvent, 0 to 5wt% dispersant and the like to help the mixing or printing of the powder.

PbO used in the present invention serves to lower the melting point of glass as a main component constituting the skeleton of the glass, wherein the content of PbO is 52 to 65 wt%, when the content of PbO is less than 50 wt%. If the softening temperature is higher than 65wt%, the coefficient of thermal expansion increases, which may cause surface cracking and warpage.

The B ₂ O ₃ and SiO ₂ serves to make the low melting glass into a stable glass, when the component is less than 7wt% glass formation becomes unstable, the expansion rate is increased, when the glass content exceeds 18wt% the glass viscosity is lowered crystallization Is easy to occur. In addition, since SiO ₂ has a relatively low dielectric constant, it also serves to lower the overall dielectric constant and to increase the etch resistance. If the content of SiO ₂ is less than 10 wt%, the etch resistance is poor, and if it exceeds 20 wt%, it is further softened. There is a possibility that the sintering shortage may occur due to the high temperature.

The Al ₂ O ₃ serves to suppress crystallization and increase the etching resistance at the same time when the glass powder is reheated, when the Al ₂ O ₃ is less than 5wt%, the etching resistance is lowered, if the glass exceeds 20wt% There is a fear that the softening temperature of the powder will increase.

The dielectric composition for forming the first dielectric layer 16 used in the present invention provides excellent etching resistance by mixing SiO ₂ or Al ₂ O ₃ at an optimum ratio as a component capable of securing the etching resistance. In order to reduce the softening point, yellowing phenomenon can be suppressed by using alkaline earth metal oxide instead of the alkali metal oxide that has been used in the prior art.

The ZnO not only plays a role of lowering the coefficient of thermal expansion and glass transition temperature while increasing the vitrification forming ability, but also absorbs the orange light generated by the discharge of Ne from the discharge gas injected into the interior of the plasma display panel, thereby improving the color purity of the plasma display panel. It also prevents the phenomenon of deterioration.

The SrO is added to control properties such as glass transition temperature and thermal expansion coefficient.

Further, in order to suppress coloring of the dielectric composition and electrode reactivity, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO may be further mixed at a composition ratio of 0 to 5 wt%, or CeO ₂ , Er ₂ O At least one of ₃ , Nd ₂ O ₃ , and Pr ₂ O ₃ is further mixed at a composition ratio of 0 to 10 wt%.

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 Embodiment 2 of the present invention includes a partition wall 13 which is a low-temperature baking dielectric material. The partition wall 13 includes PbO, B ₂ O ₃ , SiO ₂ , Al ₂ O ₃ , BaO, ZnO, and SrO, and a mixture thereof is appropriately provided to provide a stable and calcinable dielectric composition at low temperature (below 520 ° C.). It is intended that the specific composition ratio is as shown in Table 2 below.

Referring to Table 2, the dielectric composition used for the partition 13 of the plasma display panel according to the second embodiment of the present invention, 52 to 65wt% PbO, 5 to 30wt% B ₂ O ₃ , 0 to 25 wt% SiO ₂ , 0 to ₅ wt% Al ₂ O ₃ , 0 to ₁₅ wt% BaO, 0 to 10 wt% ZnO, and 0 to 15 wt% SrO.

The composition is mixed with a vehicle in a powder 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 lower. The partition 13 is completed through.

The dielectric paste is a mixture of a dielectric composition in a glass powder state of 70 to 90wt% and a vehicle of 10-30wt%. In this case, the vehicle may be mixed with 0 to 15wt% binder, 0 to 80wt% solvent, 0 to 5wt% dispersant and the like to help the mixing or printing of the powder.

Here, the dielectric paste for forming the partition 13 may include a composition containing 10 to ₂₀ wt% of TiO _{2, which} is a filler having a high refractive index, or a composition ratio including ₁₀ to ₂₀ wt% of Al ₂ O _{3, which} is a high strength ceramic filler. Has

PbO used in the present invention serves to lower the melting point of glass as a main component constituting the skeleton of the glass, wherein the content of PbO is 52 to 65 wt%, when the content of PbO is less than 50 wt%. If the softening temperature is higher than 65wt%, the coefficient of thermal expansion increases, which may cause surface cracking and warpage.

The B ₂ O ₃ and SiO ₂ serves to make the low melting glass into a stable glass, when the component is less than 7wt% glass formation becomes unstable, the expansion rate is increased, when the glass content exceeds 18wt% the glass viscosity is lowered crystallization Is easy to occur. In addition, since SiO ₂ has a relatively low dielectric constant, it also serves to lower the overall dielectric constant and to increase the etch resistance. If the content of SiO ₂ is less than 10 wt%, the etch resistance is poor, and if it exceeds 20 wt%, it is further softened. There is a possibility that the sintering shortage may occur due to the high temperature.

The Al ₂ O ₃ serves to suppress crystallization and increase the etching resistance at the same time when the glass powder is reheated, when the Al ₂ O ₃ is less than 5wt%, the etching resistance is lowered, if the glass exceeds 20wt% There is a fear that the softening temperature of the powder will increase.

The dielectric composition for forming the partition layer 13 used in the present invention provides excellent etching resistance by mixing SiO ₂ or Al ₂ O ₃ at an optimum ratio as a component capable of securing the etching resistance, In order to lower the softening point, yellowing phenomenon can be suppressed by using alkaline earth metal oxide instead of the alkali metal oxide used in the prior art.

The ZnO not only plays a role of lowering the coefficient of thermal expansion and glass transition temperature while increasing the vitrification forming ability, but also absorbs the orange light generated by the discharge of Ne from the discharge gas injected into the interior of the plasma display panel, thereby improving the color purity of the plasma display panel. It also prevents the phenomenon of deterioration.

The SrO is added to control properties such as glass transition temperature and thermal expansion coefficient.

Further, in order to suppress coloring of the dielectric composition and electrode reactivity, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO may be further mixed at a composition ratio of 0 to 5 wt%, or CeO ₂ , Er ₂ O At least one of ₃ , Nd ₂ O ₃ , and Pr ₂ O ₃ is further mixed at a composition ratio of 0 to 10 wt%.

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 a low temperature baking dielectric. The second dielectric 14 includes PbO, B ₂ O ₃ , SiO ₂ , Al ₂ O ₃ , BaO, ZnO, and SrO, and the dielectric composition is stably mixed and fired at a low temperature (below 520 ° C.) by appropriate mixing thereof. To provide a 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 52 to 65 wt% of PbO and 5 to 30 wt% of B ₂ O _3. , 0 to 25 wt% SiO ₂ , 0 to ₅ wt% Al ₂ O ₃ , 0 to ₁₅ wt% BaO, 0 to 10 wt% ZnO, and 0 to 15 wt% SrO.

The composition is mixed with a vehicle in a powder 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 lower. Through the second dielectric 14 is completed.

The dielectric paste is a mixture of a dielectric composition in a glass powder state of 70 to 90wt% and a vehicle of 10-30wt%. In this case, the vehicle may be mixed with 0 to 15wt% binder, 0 to 80wt% solvent, 0 to 5wt% dispersant and the like to help the mixing or printing of the powder.

Here, the dielectric paste for forming the second dielectric 14 may include 10-20 wt% of TiO _{2, which} is a high refractive index filler, or 10-20 wt% of Al ₂ O _{3, which} is a high strength ceramic filler. Has a composition ratio.

PbO used in the present invention serves to lower the melting point of glass as a main component constituting the skeleton of the glass, wherein the content of PbO is 52 to 65 wt%, when the content of PbO is less than 50 wt%. If the softening temperature is higher than 65wt%, the coefficient of thermal expansion increases, which may cause surface cracking and warpage.

The B ₂ O ₃ and SiO ₂ serves to make the low melting glass into a stable glass, when the component is less than 7wt% glass formation becomes unstable, the expansion rate is increased, when the glass content exceeds 18wt% the glass viscosity is lowered crystallization Is easy to occur. In addition, since SiO ₂ has a relatively low dielectric constant, it also serves to lower the overall dielectric constant and to increase the etch resistance. If the content of SiO ₂ is less than 10 wt%, the etch resistance is poor, and if it exceeds 20 wt%, it is further softened. There is a possibility that the sintering shortage may occur due to the high temperature.

The Al ₂ O ₃ serves to suppress crystallization and increase the etching resistance at the same time when the glass powder is reheated, when the Al ₂ O ₃ is less than 5wt%, the etching resistance is lowered, if the glass exceeds 20wt% There is a fear that the softening temperature of the powder will increase.

The dielectric composition for forming the second dielectric layer 14 used in the present invention provides excellent etching resistance by mixing SiO ₂ or Al ₂ O ₃ at an optimum ratio as a component capable of securing the etching resistance. In order to reduce the softening point, yellowing phenomenon can be suppressed by using alkaline earth metal oxide instead of the alkali metal oxide that has been used in the prior art.

The ZnO not only plays a role of lowering the coefficient of thermal expansion and glass transition temperature while increasing the vitrification forming ability, but also absorbs the orange light generated by the discharge of Ne from the discharge gas injected into the interior of the plasma display panel, thereby improving the color purity of the plasma display panel. It also prevents the phenomenon of deterioration.

The SrO is added to control properties such as glass transition temperature and thermal expansion coefficient.

Further, in order to suppress coloring of the dielectric composition and electrode reactivity, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO may be further mixed at a composition ratio of 0 to 5 wt%, or CeO ₂ , Er ₂ O At least one of ₃ , Nd ₂ O ₃ , and Pr ₂ O ₃ is further mixed at a composition ratio of 0 to 10 wt%.

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 the fourth exemplary embodiment includes a first dielectric 16, a second dielectric 14, and a partition 13, which are low-temperature baking dielectrics. The first dielectric 16 as the upper dielectric, the second dielectric 14 as the lower dielectric, and the partition 13 as the dielectric are PbO, B ₂ O ₃ , SiO ₂ , Al ₂ O ₃ , BaO, ZnO And it is to provide a dielectric composition comprising SrO, and by mixing them appropriately and stable at low temperature (520 ℃ or less), the specific composition ratio is shown in Table 4 below.

Referring to Table 4, the dielectric composition used for the first, second dielectrics 16 and 14 and the partition 13 of the plasma display panel according to the fourth embodiment of the present invention is 52 to 65 wt% of PbO, 5 to 30 wt% B ₂ O ₃ , 0 to 25 wt% SiO ₂ , 0 to ₅ wt% Al ₂ O ₃ , 0 to ₁₅ wt% BaO, 0 to 10 wt% ZnO, and 0 to 15 wt% SrO.

The composition is mixed with a vehicle in a powder state having a particle size of 1 to 1.5 mu m, made of a dielectric paste having a viscosity of 40,000 to 60,000 cps, and then completely coated on the first substrate 11 or the second substrate 12, and subjected to 520 ° C. The first and second dielectrics 16 and 14 and the partition 13 are completed through a process of firing at the following temperatures.

The dielectric paste is a mixture of a dielectric composition in a glass powder state of 70 to 90wt% and a vehicle of 10-30wt%. In this case, the vehicle may be mixed with 0 to 15wt% binder, 0 to 80wt% solvent, 0 to 5wt% dispersant and the like to help the mixing or printing of the powder.

Here, the paste for forming the second dielectric 14 or the partition wall 13 may include 10-20 wt% of TiO _{2, which} is a filler of high refractive index, or 10-20 wt% of Al ₂ O ₃ , which is a high-strength ceramic filler. Has a composition ratio further included.

PbO used in the present invention serves to lower the melting point of glass as a main component constituting the skeleton of the glass, wherein the content of PbO is 52 to 65 wt%, when the content of PbO is less than 50 wt%. If the softening temperature is higher than 65wt%, the coefficient of thermal expansion increases, which may cause surface cracking and warpage.

The B ₂ O ₃ and SiO ₂ serves to make the low melting glass into a stable glass, when the component is less than 7wt% glass formation becomes unstable, the expansion rate is increased, when the glass content exceeds 18wt% the glass viscosity is lowered crystallization Is easy to occur. In addition, since SiO ₂ has a relatively low dielectric constant, it also serves to lower the overall dielectric constant and to increase the etch resistance. If the content of SiO ₂ is less than 10 wt%, the etch resistance is poor, and if it exceeds 20 wt%, it is further softened. There is a possibility that the sintering shortage may occur due to the high temperature.

The Al ₂ O ₃ serves to suppress crystallization and increase the etching resistance at the same time when the glass powder is reheated, when the Al ₂ O ₃ is less than 5wt%, the etching resistance is lowered, if the glass exceeds 20wt% There is a fear that the softening temperature of the powder will increase.

In the dielectric composition for forming the first and second dielectric layers 16 and 14 or the partition layer 13 used in the present invention, SiO ₂ or Al ₂ O ₃ is used at an optimum ratio as a component capable of ensuring the etching resistance. By mixing, the yellowing phenomenon can be suppressed by using an alkaline earth metal oxide instead of the alkali metal oxide that has been used in the prior art in order to impart excellent etching resistance and lower the softening point.

The ZnO not only plays a role of lowering the coefficient of thermal expansion and glass transition temperature while increasing the vitrification forming ability, but also absorbs the orange light generated by the discharge of Ne from the discharge gas injected into the interior of the plasma display panel, thereby improving the color purity of the plasma display panel. It also prevents the phenomenon of deterioration.

The SrO is added to control properties such as glass transition temperature and thermal expansion coefficient.

Further, in order to suppress coloring of the dielectric composition and electrode reactivity, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO may be further mixed at a composition ratio of 0 to 5 wt%, or CeO ₂ , Er ₂ O At least one of ₃ , Nd ₂ O ₃ , and Pr ₂ O ₃ is further mixed at a composition ratio of 0 to 10 wt%.

Hereinafter, embodiments 5 to 8 of the present invention will be described in detail.

Example  5

62.5 wt% PbO, 12.5 wt% B ₂ O ₃ , to prepare the dielectric composition according to the present invention. A glass wool composition can be prepared by mixing the composition ratio in a composition ratio of 16 wt% SiO ₂ , 4 wt% Al ₂ O ₃ , 0 wt% BaO, 0 wt% ZnO, and 5 wt% SrO. With respect to the composition, an experimental value of 12.0, a thermal expansion coefficient of 82.1 × 10 ⁻⁷ ° C., a firing temperature of 520 ° C. or less, and a transparency were obtained. In order to suppress electrode reactivity in this glass wool composition, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO may be further mixed in a composition ratio of 0 to 5 wt%, or CeO ₂ , Er ₂ O ₃ , Nd At least one of ₂ O ₃ and Pr ₂ O ₃ may be further mixed in a composition ratio of 0 to 10 wt%.

Example  6

To prepare the dielectric composition according to the present invention, 52 wt% PbO, ₁₂ wt% B ₂ O ₃ , ₁₂ wt% SiO ₂ , 4 wt% Al ₂ O ₃ , 0 wt% BaO, 10 wt% ZnO, and 10 wt% The glass wool composition can be prepared by mixing in a composition ratio of SrO of. For this prepared glass wool composition, the dielectric constant is 12.5, the coefficient of thermal expansion is 86.3 × 10 ^-7 ° C., the firing temperature is 520 ° C. or lower, and an experimental value of transparent Could get In order to suppress electrode reactivity in this glass wool composition, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO may be further mixed in a composition ratio of 0 to 5 wt%, or CeO ₂ , Er ₂ O ₃ , Nd At least one of ₂ O ₃ and Pr ₂ O ₃ may be further mixed in a composition ratio of 0 to 10 wt%.

Example  7

55 wt% PbO, 17.5 wt% B ₂ O ₃ , ₁₂ wt% SiO ₂ , 3 wt% Al ₂ O ₃ , 8 wt% BaO, 2.5 wt% ZnO, and to prepare the dielectric composition according to the present invention. The glass wool composition may be prepared by mixing in a composition ratio of 0 wt% SrO. The glass wool composition may have a dielectric constant of 11.6, a thermal expansion coefficient of 81.7 × 10 ⁻⁷ ° C., a firing temperature of 520 ° C. or less, and an opacity. Experimental values were obtained. In order to suppress electrode reactivity in this glass wool composition, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO may be further mixed in a composition ratio of 0 to 5 wt%, or CeO ₂ , Er ₂ O ₃ , Nd At least one of ₂ O ₃ and Pr ₂ O ₃ may be further mixed in a composition ratio of 0 to 10 wt%.

Example  8

62 wt% PbO, ₁₂ wt% B ₂ O ₃ , ₁₂ wt% SiO ₂ , 4 wt% Al ₂ O ₃ , 0 wt% BaO, 0 wt% ZnO, and 10 wt% The glass wool composition can be prepared by mixing in a composition ratio of SrO of. For this prepared glass wool composition, the dielectric constant is 12.7, the coefficient of thermal expansion is 89.7 × 10 ^-7 ° C., the firing temperature is 520 ° C. or lower, and an experimental value of transparent Could get In order to suppress electrode reactivity in this glass wool composition, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO may be further mixed in a composition ratio of 0 to 5 wt%, or CeO ₂ , Er ₂ O ₃ , Nd At least one of ₂ O ₃ and Pr ₂ O ₃ may be further mixed in a composition ratio of 0 to 10 wt%.

6 is a schematic block diagram showing a method of manufacturing a plasma display panel according to Embodiment 9 of the present invention.

As shown in FIG. 6, a step 61 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, and a partition wall, of 52 to 65 wt% PbO, 5-30 wt% B ₂ O ₃ , A paste is prepared by mixing a dielectric composition with a vehicle comprising 0-25 wt% SiO ₂ , 0-5 wt% Al ₂ O ₃ , 0-15 wt% BaO, 0-10 wt% ZnO, and 0-15 wt% SrO. Manufacturing (62), applying the paste onto a substrate (63), and baking the paste to form at least one of the first, second dielectrics, and barrier ribs (64).

In order to suppress coloring of the dielectric composition and electrode reactivity, at least one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO is further contained in an amount of 0 to 5 wt%, or CeO ₂ , Er ₂ O ₃ At least one of Nd ₂ O ₃ and Pr ₂ O ₃ has a composition ratio of 0-10 wt%.

Here, the second dielectric or partition wall forming paste may include a composition containing 10 to ₂₀ wt% of TiO _{2, which} is a filler having a high refractive index, or a composition ratio including ₁₀ to ₂₀ wt% of Al ₂ O _{3, which} is a high strength ceramic filler. Have

Here, in the step 62 of preparing the paste, first, the dielectric composition (glass) mixed at the above composition ratio is melted at a 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.

The step of applying the paste onto the substrate (63) is applied to the entire surface of the layer capable of forming at least one of the first, second dielectric, and barrier ribs by at least one of screen printing, dispensing, and inkjet printing. .

Next, the prepared paste is applied to the entire surface of the layer capable of forming at least one of the first and second dielectrics and the partition walls and baked at a temperature of 520 ° C. or lower, thereby selecting any one of the first and second dielectrics and the partition walls. To form.

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the present invention is not limited to the above embodiment, various modifications and combinations are possible, and various embodiments of the technical idea are all present invention Naturally, it belongs to the protection scope of.

As described above, the dielectric composition for a plasma display panel and the plasma display panel using the same according to an embodiment of the present invention can be used in combination with a low-cost soda-lime glass substrate and a PbO dielectric composition having a low firing temperature in terms of unit cost, thereby preventing yellowing. There is an effect that can be prevented.

In addition, the present invention has the effect of not increasing the coefficient of thermal expansion compared to the lower glass transition temperature, it is possible to provide a high transmittance plasma display panel, it is possible to improve the overall price competitiveness of the plasma display panel. .

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 (8)

52 to 65 wt% PbO; 5-30 wt% of B ₂ O ₃ ; 0-25 wt% of SiO ₂ ; 0-5 wt% Al ₂ O ₃ ; 0-15 wt% BaO; 0-10 wt% ZnO; And A dielectric composition for a plasma display panel having a composition ratio containing 0 to 15wt% SrO. The method of claim 1, wherein the dielectric composition, In order to suppress coloring of the composition and electrode reactivity, at least any one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, NiO has a composition ratio further comprising 0 to 5wt%. The method of claim 1, wherein the dielectric composition, In order to suppress coloring of the composition and electrode reactivity, at least one of CeO ₂ , Er ₂ O ₃ , Nd ₂ O ₃ , and Pr ₂ O ₃ has a composition ratio further comprising 0 to 10 wt%. . A first substrate having a first dielectric formed thereon; A second substrate having a second dielectric formed thereon; A partition wall positioned between the first substrate and the second substrate, At least one of the first and second dielectrics and barrier ribs may include 52 to 65 wt% of PbO, 5 to 30 wt% of B ₂ O ₃ , Plasma having a composition ratio including 0 to 25 wt% SiO ₂ , 0 to ₅ wt% Al ₂ O ₃ , 0 to ₁₅ wt% BaO, 0 to 10 wt% ZnO, and 0 to 15 wt% SrO Display panel. The method of claim 4, wherein at least one of the first and second dielectrics and the partition wall, In order to suppress coloring of the composition and electrode reactivity, at least any one of CoO, CuO, Cr ₂ O ₃ , MnO, FeO, NiO has a composition ratio further comprising 0 to 5wt%. The method of claim 4, wherein at least one of the first and second dielectrics and the partition wall, In order to suppress coloring of the composition and electrode reactivity, at least one of CeO ₂ , Er ₂ O ₃ , Nd ₂ O ₃ , and Pr ₂ O ₃ has a composition ratio further comprising 0 to 10 wt%. Display panel. The method of claim 4, wherein at least one of the second dielectric and the partition wall is A plasma display panel comprising a composition ratio further comprising 10 to ₂₀ wt% TiO _{2, which} is a high refractive index filler. The method of claim 4, wherein at least one of the second dielectric and the partition wall is A plasma display panel having a composition ratio further comprising Al ₂ O _{3 of 10} to ₂₀ wt%, which is a high-strength ceramic filler.

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