KR100590007B1 - Plasma display panel and the preparation method thereof - Google Patents

Abstract

The present invention relates to a plasma display panel and a method of manufacturing the same, and more particularly, a) a first substrate and a second substrate disposed to face each other; b) address electrodes and dielectric layers provided on the first substrate and discharge sustain electrodes provided on the second substrate, the dielectric layer and the protective film; c) a partition wall disposed in a space between the first substrate and the second substrate and installed on the first substrate to partition the plurality of discharge cells, the partition including an electrically conductive material; And d) a red, green, and blue phosphor layer in which the relative deviation of the line width of the phosphor layer in the discharge cell partitioned by the partition wall is within ± 10% of the average line width of each phosphor layer. will be.

  Plasma display panel of the present invention includes an electrically conductive material inside the partition wall, less influence of static electricity generated during the coating of the phosphor, less relative deviation of the line width of the phosphor layer, excellent in coating uniformity of the phosphor, and can reduce the process defects There is an advantage.

Plasma Display Panels, Electrically Conductive Materials, Static Electricity, Scattering, ITO

Description

Plasma display panel and its manufacturing method {PLASMA DISPLAY PANEL AND THE PREPARATION METHOD THEREOF}

1 is a partially exploded perspective view schematically showing a plasma display panel of the present invention.

Figure 2 is a schematic diagram showing a dielectric constant measuring method using a dielectric constant meter of a metal-insulator-metal (MIM) structure.

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a method of manufacturing the same, and more particularly, to a plasma display panel and a method of manufacturing the same, which are excellent in quality by uniformly applying a phosphor layer.

[Private Technology]

The plasma display panel is a display device using a plasma phenomenon, and discharge occurs when at least one potential difference is applied between two spatially separated contacts in a gas atmosphere in a non-vacuum state, which is called a gas discharge phenomenon.

A plasma display element is a flat panel display element which applied such gas discharge phenomenon to image display. A plasma display panel generally used at present is a reflective AC driving plasma display panel. In the case of a back substrate structure, a phosphor layer is formed in discharge cells partitioned by partition walls.

The plasma display panel, like other flat panel display devices such as a fluorescent display tube (VFD) or a field emission display (FED), has two substrates (referred to as a first substrate and a second substrate for convenience) at an arbitrary distance. Substantially arranged in parallel to form the appearance, the substrates are bonded by a bonding material disposed along the circumference therebetween to form a discharge cell in a vacuum state.

In general, the screen printing method is mainly applied to the process of forming the phosphor on the plasma display panel, but in the high-definition (HD) level panel or the multi-sided method, it is difficult to secure the quality through the screen printing method. In this case, it is difficult to produce a printing mask, and the use cycle of the mask is very short, so it is difficult to afford the material cost.

As a method to replace the screen printing method, a plurality of red (R), green (G), and blue (B) phosphor supply nozzles are disposed between the fine partition walls, and nozzles are sprayed through the nozzles. A study on the spraying method (or "dispenser method") is underway. The dispenser method has a great advantage in terms of mass productivity because the dispenser method has a longer lifespan, a fine pattern application, and multiple odors than the screen printing method.

However, unlike the conventional printing method, since the dispenser method is applied with a phosphor in a state where the upper part of the partition and the nozzle are spaced to some extent, static electricity may be generated between the nozzle and the partition by the nozzle, the partition, and the external air, and the phosphor may cause the phosphor. There is a problem that the injection path of the distorted phosphors are mixed or overflowed over the partition wall, the coating quality is not good. This phenomenon becomes worse as the gap between the nozzle and the partition wall becomes wider, and when the gap between the nozzle and the partition wall is reduced in order to prevent this, the nozzle breakage problem may occur.

The present invention is to solve the above problems, an object of the present invention is to provide a plasma display panel excellent in coating quality by preventing the generation of static electricity between the nozzle and the partition wall when the phosphor is applied.

Another object of the present invention is to provide a method of manufacturing the plasma display panel.

The present invention to achieve the above object, a) a first substrate and a second substrate disposed opposite each other; b) address electrodes and dielectric layers provided on the first substrate and discharge sustain electrodes provided on the second substrate, the dielectric layer and the protective film; c) a partition wall disposed in a space between the first substrate and the second substrate and installed on the first substrate to partition the plurality of discharge cells, the partition including an electrically conductive material; And d) a red, green, and blue phosphor layer in which the relative deviation of the line width of the phosphor layer in the discharge cells partitioned by the partition wall is within ± 10% of the average line width of each phosphor layer.

The present invention also includes a) preparing a first substrate on which an address electrode and a dielectric layer are formed; b) forming a partition including an electrically conductive material on the entire surface of the dielectric layer of the first substrate; c) applying and drying a phosphor layer in the discharge cells partitioned by the partition wall; d) preparing a second substrate on which a discharge sustaining electrode, a dielectric layer, and a protective film are formed; And e) assembling, encapsulating, evacuating, discharging gas, and aging the panel using the first and second substrates.

Hereinafter, the present invention will be described in more detail.

The plasma display panel of the present invention has an improvement in coating failure due to static electricity generated when applying a phosphor by including an electrically conductive material in the partition wall.

1 is a partially exploded perspective view schematically showing a plasma display panel of the present invention. Referring to the drawings, in the conventional plasma display panel, address electrodes 3 are formed in one direction (Y direction in the drawing) on the first substrate 1, and the first substrate covers the address electrodes 3. The dielectric layer 5 is formed in front of (1). A partition 7 including an electrically conductive material is formed between the address electrodes 3 on the dielectric layer 5, and red (R), green (G) and blue colors are formed in the discharge cells between the respective partitions 7. The phosphor layer 9 of (B) is located.

The red (R), green (G), and blue (B) phosphor layers 9 are uniformly applied, and preferably the width of the phosphor layer applied in one discharge cell (in the X direction of the drawing). A width, hereinafter referred to as 'line width', which represents a deviation from the average line width of the phosphor layer within ± 10%, more preferably within ± 7%.

It is preferable that the said phosphor layer is apply | coated by the dispenser method which inject | pours a phosphor paste from a nozzle.

One surface of the second substrate 11 opposite to the first substrate 1 includes a pair of transparent electrodes 13a and bus electrodes 13b along a direction orthogonal to the address electrode 3 (X direction in the drawing). The discharge sustain electrodes 13 are formed, and the transparent dielectric layer 15 and the passivation layer 17 are disposed on the entire second substrate 11 while covering the discharge sustain electrodes 13. As a result, the intersection of the address electrode 3 and the discharge sustain electrode 13 constitutes a discharge cell.

With this configuration, the address discharge is applied by applying the address voltage Va between the address electrode 3 and any one of the discharge sustaining electrodes 13, and the sustain voltage Vs is again generated between the pair of discharge sustaining electrodes 13. ), The vacuum ultraviolet rays generated during the sustain discharge excite the phosphor layer 9 to emit visible light through the transparent front substrate 11. The electrically conductive material is preferably an average particle diameter of 0.5 to 0.8 ㎛.

In addition, the electrically conductive material is preferably included in 10 to 30% by weight, more preferably in 14 to 26% by weight relative to the total weight of the partition wall formed in the plasma display panel. If the content of the electrically conductive material contained in the partition is less than 10% by weight, the antistatic effect is insignificant, and if it exceeds 30% by weight, the dielectric constant of the partition is reduced, and the number of electrically conductive particles exposed to the outside of the partition is increased. This may cause a discharge failure.

The electrically conductive material included in the partition wall of the plasma display panel of the present invention is preferably indium tin oxide (ITO), zinc oxide (ZnO) or a mixture thereof, and more preferably indium tin oxide.

The partition wall of the plasma display panel of the present invention including the electrically conductive material has a higher dielectric constant, and the dielectric constant is preferably 7 or more, and more preferably 7 to 10. If the dielectric constant of the barrier is less than 7, discharge failure may result.

The method of manufacturing the plasma display panel includes a) preparing a first substrate having an address electrode and a dielectric layer formed thereon, b) forming a barrier rib including an electrically conductive material on the entire surface of the dielectric layer of the first substrate, and c) the barrier rib. A phosphor layer is coated and dried in a discharge cell partitioned by the cell, and d) a second substrate having a discharge sustaining electrode, a dielectric layer and a protective film is prepared, and e) a panel is assembled and sealed using the first substrate and the second substrate. Evacuating, discharging gas injection and aging.

At this time, in the method of manufacturing the plasma display panel, steps a), d), and e) may use the conventional method of manufacturing the plasma display panel as it is, and thus, details are not described. And c) the formation of the phosphor layer.

The partition wall of step b) is generally formed by mixing a widely used composition for forming a partition and an electrically conductive material, and the type of mother glass powder included in the composition for forming a partition is not particularly limited.

The electrically conductive material is preferably used having an average particle diameter of 0.5 to 0.8 ㎛.

 In addition, the electrically conductive material is preferably mixed to 10 to 30% by weight, more preferably to 14 to 26% by weight based on the weight of the partition to be finally formed. The weight of the partition to be finally formed means the sum of the weights of the partition forming composition and the electrically conductive material excluding the solvent and the binder. When the content of the electrically conductive material is less than 10% by weight, the antistatic effect is insignificant, and when the content of the electrically conductive material is greater than 30% by weight, the dielectric constant of the partition wall is decreased, and the number of electrically conductive particles exposed to the outside of the partition wall increases discharge failure. Can cause.

Preferable examples of the electrically conductive material may be indium tin oxide (ITO), zinc oxide (ZnO) or a mixture thereof, and more preferably indium tin oxide.

Conventional sandblasting or etching methods may be used as a method of forming the partition wall using the partition formation composition including the electrically conductive material.

After the partition wall is formed by the above method, c) a phosphor layer is formed in the discharge cells partitioned by the partition wall. In this case, it is preferable to use the dispenser method as the method used for coating the phosphor layer.

Since the method of manufacturing the plasma display panel of the present invention includes an electrically conductive material inside the partition wall, there is an advantage in that the application of the phosphor is facilitated by removing the influence of static electricity generated when using a conventional dispenser method.

Hereinafter, preferred embodiments of the present invention are described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.

EXAMPLE

Example 1

86 parts by weight of the mother glass powder including 60% by weight of PbO, 30% by weight of SiO ₂ and 10% by weight of B ₂ O _{3 and} 14% by weight of indium tin oxide (ITO) having a weight ratio of In ₂ O ₃ and SnO _{2 in} a 1: 1 ratio After mixing the parts in a powder state, 70% by weight of the mixed powder, 2% by weight of ethyl cellulose and 28% by weight of butylcarbitol acetate (BCA) were mixed to prepare a composition for forming a partition wall.

In addition, after the address electrode and the dielectric layer were formed on the prepared glass substrate, the prepared barrier-forming composition was coated on the dielectric layer, dried, fired, and patterned and etched to prepare a first substrate having the barrier rib.

Butyl carbitol acetate and Terre weight ratio of terpineol 3:07 ethyl cellulose by mixing parts of 6 parts by weight binder with respect to the mixed solvent of 100 parts by weight to prepare a binder solution, a red phosphor of _{(Y, Gd) BO 3:} Eu, a blue phosphor Phosphorus BaMgAl ₁₀ O ₁₇ : Eu and green phosphor ZnSiO ₄ : Mn were mixed at 40 parts by weight with respect to 60 parts by weight of the binder solution, respectively, and then red, green, and blue in the discharge cells of the first substrate partitioned by the partition wall. The phosphor was sprayed, dried and calcined to form a phosphor layer. (Dispenser method)

After preparing a second substrate on which a discharge sustaining electrode, a dielectric layer, and a protective film were formed, the panel was assembled, sealed, exhausted, discharged, injected, and aged using the first and second substrates to manufacture a plasma display panel.

Example 2

A plasma display panel was manufactured in the same manner as in Example 1, except that 80 parts by weight of the mother glass powder and 20 parts by weight of indium tin oxide (ITO) having a weight ratio of In ₂ O ₃ and SnO ₂ were mixed. Was prepared.

Example 3

A plasma display panel was manufactured in the same manner as in Example 1, except that 74 parts by weight of the mother glass powder and 26 parts by weight of indium tin oxide (ITO) having a weight ratio of In ₂ O ₃ and SnO ₂ were mixed. Was prepared.

Comparative Example 1

A plasma display panel was manufactured in the same manner as in Example 1, except that indium tin oxide (ITO) was not added to the partition wall.

Comparative Example 2

A plasma display panel was manufactured in the same manner as in Example 1, except that 68 parts by weight of the mother glass powder and 32 parts by weight of indium tin oxide (ITO) having a weight ratio of In ₂ O ₃ and SnO ₂ were mixed to prepare a partition wall. Was prepared.

Dielectric constants of the barrier ribs formed during the fabrication of the plasma display panels of Examples 1 to 3 and Comparative Examples 1 and 2 were measured by a dielectric constant meter (Model 6135,050, manufactured by CEAST, Inc.) of a metal-insulator-metal structure. . 2 is a schematic diagram showing a method for measuring permittivity using a permittivity measurer of a metal-insulator-metal (MIM) structure.

In addition, for the partition wall, the electrostatic voltage was measured using a voltage meter (Asahi Co., Ltd. Model-Chilles), and the relative deviation of the line width was measured after coating the phosphor layer in the discharge cell partitioned into the partition wall, and dried. The relative deviation of the line width was calculated by measuring the line width of 5 points at a uniform interval for one phosphor stripe to calculate the deviation from the average value.

The relative deviations of the dielectric constant of the partition wall, the electrostatic voltage, and the line width of the phosphor layer measured by the above method are summarized in Table 1 below.

TABLE 1

Comparative Example 1 Example 1 Example 2 Example 3 Comparative Example 2 Parent glass content (%) 100 86 80 74 68 Conductive substance content (%) 0 14 20 26 32 permittivity 12 10 9 8.7 6 Static electricity (max / min) -330V / -20V -140V / -10V -98V / -12V -76V / -1V -55V / + 3V Static electricity (average) -120V -81V -43V -38V -35V Average line width (㎛) 500 505 489 501 510 Linewidth Deviation (㎛) ± 135 ± 34 ± 30 ± 25 ± 65 Relative deviation of line width (%) ± 27 ± 6.7 ± 6.1 ± 5.0 ± 12.7

As shown in Table 1, the partition wall of Comparative Example 1, which does not include the electrically conductive material, has a high electrostatic voltage, and it can be seen that the relative deviation of the line width of the phosphor layer is large, and includes 30 wt% or more of the electrically conductive material. It can be seen that the partition wall of Comparative Example 2 has a low electrostatic voltage and a low dielectric constant, and is also less effective in improving the relative deviation of the line width of the phosphor layer.

On the other hand, the barrier ribs according to Examples 1 to 3 have a low electrostatic voltage, a small decrease in dielectric constant, and a small change in line width of the applied phosphor layer.

  Plasma display panel of the present invention includes an electrically conductive material in the partition wall, less influence of static electricity generated during the coating of the phosphor, less relative deviation of the line width of the phosphor layer, excellent in uniformity of the coating of the phosphor, can reduce the process defects There is an advantage.

Claims (14)

a) a first substrate and a second substrate disposed to face each other; b) address electrodes and dielectric layers provided on the first substrate and discharge sustain electrodes provided on the second substrate, the dielectric layer and the protective film; c) a group of indium tin oxide (ITO), zinc oxide (ZnO), and mixtures thereof, disposed in the space between the first and second substrates and installed in the first substrate to partition the plurality of discharge cells; A partition comprising an electrically conductive material selected from; And d) red, green and blue phosphor layers in which the relative deviation of the line width of the phosphor layer in the discharge cells partitioned by the partition wall is within ± 10% of the average line width of each phosphor layer. Plasma display panel comprising a. delete The plasma display panel of claim 1, wherein the electrically conductive material of c) has an average particle diameter of 0.5 to 0.8 m. The plasma display panel of claim 1, wherein the electrically conductive material of c) is included in an amount of 10 to 30 wt% based on the total weight of the partition wall. The plasma display panel of claim 4, wherein the electrically conductive material of c) is included in an amount of 14 to 26 wt% based on the total weight of the partition wall. The plasma display panel of claim 1, wherein a dielectric constant of a partition wall formed on the first substrate is 7 or more. The plasma display panel of claim 1, wherein the red, green, and blue phosphor layers of d) have a relative deviation in line width within ± 7% of an average line width of each phosphor layer. The plasma display panel of claim 1, wherein the red, green, and blue phosphor layers of d) are applied by using a dispenser method. a) preparing a first substrate on which an address electrode and a dielectric layer are formed; b) forming a barrier rib on the front surface of the dielectric layer of the first substrate, the barrier rib including an electrically conductive material selected from the group consisting of indium tin oxide (ITO), zinc oxide (ZnO), and mixtures thereof; c) applying and drying a phosphor layer in the discharge cells partitioned by the partition wall; d) preparing a second substrate on which a discharge sustaining electrode, a dielectric layer, and a protective film are formed; And e) assembling, encapsulating, evacuating, discharging gas and aging the panel using the first substrate and the second substrate. Method of manufacturing a plasma display panel comprising a. delete The method of claim 9, wherein the electrically conductive material of step b) has an average particle diameter of 0.5 to 0.8 μm. The method of claim 9, wherein the electrically conductive material of step b) is mixed to be 10 to 30% by weight based on the total weight of the barrier rib finally formed. The method of claim 12, wherein the electrically conductive material of step b) is mixed to be 14 to 26 wt% with respect to the total weight of the barrier rib finally formed. The method of claim 9, wherein the phosphor layer of step c) is applied using a dispenser method.

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