KR100775347B1 - Discharging noise reductive plasma display panel and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a plasma display panel with reduced discharge noise and a method of manufacturing the same. In the conventional plasma display panel, the gap between the upper plate and the lower plate is not complete, so that a gap is generated. The gap is discharged by resonance vibration at high altitude. There is a problem of lowering the reliability and quality of the panel by generating noise. A technique to solve this problem is proposed by forming a sealant black top on the upper part of the bulkhead and joining the upper and lower plates, but a slurry-type sealant black top on the narrow part of the bulkhead. Since it may be difficult to form and may be formed only in a limited region due to the property of fluidity, there is a problem that the phosphor is contaminated or the contrast property is deteriorated. In view of the above problems, the present invention further forms a new second dielectric layer on the upper dielectric layer of the upper surface of the plasma display panel, patterns and defines a region where the sealant black matrix is to be formed, and then forms a sealant black matrix on the defined region. By forming a protective film on the upper part, the partition wall of the lower plate is in close contact with the formed sealant black matrix at the time of joining the upper plate and the lower plate on which the structure is formed, thereby reducing the discharge noise due to resonance vibration at high altitude and improving the contrast characteristic. It works.

Description

Plasma display panel with reduced discharge noise and manufacturing method thereof {DISCHARGING NOISE REDUCTIVE PLASMA DISPLAY PANEL AND MANUFACTURING METHOD THEREOF}

1 is a cross-sectional view showing a typical plasma display panel device.

2a to 2e is a cross-sectional view showing a manufacturing process of an embodiment of the present invention.

Figure 3 is a perspective view showing the structure of an embodiment of the present invention.

Figure 4 is a cross-sectional view showing the structure of an embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

20: upper substrate 21: transparent electrode

22 bus electrode 23 first dielectric layer

24: second dielectric layer 25: black sealant

26: protective film 30: lower substrate

31: address electrode 32: lower dielectric

33: partition 34: phosphor

The present invention relates to a plasma display panel with a reduced discharge noise and a method of manufacturing the same. Particularly, a plasma with reduced discharge noise to minimize the discharge noise caused by resonance vibration at high altitude and to increase the contrast characteristics through an easy process. A display panel and a method of manufacturing the same.

Plasma Display Panel (PDP) devices, which are spotlighted as next-generation display devices along with TFT liquid crystal display (LCD), organic EL, and FED, are He + Xe in discharge cells isolated by barrier ribs. Or 147 nm ultraviolet rays generated at the time of discharge of Ne + Xe gas excite the phosphors of R, G, and B and use the light emission phenomenon due to the energy difference when the phosphor returns from the excited state to the ground state. The PDP display device is expected to occupy the large display device market of 40 ˝ or more due to its simple structure, ease of manufacturing, high brightness and high light emitting efficiency, memory function, high nonlinearity, and wide viewing angle of 160 ° or more. A 102 "class product has already been developed.

FIG. 1 is a cross-sectional view and a perspective view of a general AC PDP device. First, a lower plate of a PDP device is deposited on an upper surface of a lower glass substrate 1 to prevent penetration of alkali ions included in the substrate 1. An address electrode 3 of a discharge cell formed on a part of the blocking film 2, a lower plate dielectric 4 formed on an entire surface on the blocking film 2 including the address electrode 3, and the lower plate dielectric 4. And a phosphor 6 formed on the lower wall dielectric 4 separated by the partition 5. A portion of the upper part of the partition 5 may form a black dielectric material to separately manufacture a black top to increase contrast.

In addition, the upper panel of the plasma display panel element includes a transparent electrode 12 formed on the upper glass substrate 11 and a bus electrode 13 for lowering the resistance of the transparent electrode 12, the transparent electrode 12, and the bus. An upper plate dielectric 14 formed on the front surface of the upper glass substrate 11 including the electrode 13;

It is formed on the upper surface of the upper dielectric 14 to form a protective film 15 to protect the upper dielectric 14 according to the plasma discharge, the upper plate formed in this way, the protective film 15 is the barrier rib 5 and the phosphor of the lower plate ( It is installed to face 6).

As described above, each electrode of the AC-type PDP device using three electrodes for driving has an address electrode 3 located on the lower plate and a pair of transparent electrodes 12 and bus electrode 13 located on the upper plate according to its function. It is divided into a scan electrode and a sustain (sustain) electrode is made, the scan electrode and the sustain electrode is formed of the same structure, and because the operation in the same function in the sustain section, both may be referred to as the sustain electrode.

In the structure of the illustrated panel element, there is a slight gap between the upper plate protective film 15 and the lower plate partition wall 5. The lower plate and the upper plate are formed by the frit structure of the outer portion of the panel and the structure formed inside the panel. While being supported and sealed, the partition 5 and the upper protective film 15 do not contact each other. However, the gap between the partition wall 5 and the upper protective film 15 is not fixed due to irregular panel conditions such as panel warping due to heat treatment, pressure by discharge gas, and the variation is severe. At high altitude, resonance is vibrated at a narrow distance between the barrier rib 5 and the upper protective film 15 to generate high frequency noise during discharge.

That is, in a high altitude region, the discharge characteristic may be deteriorated due to the decrease in air pressure, and noise may occur, thereby causing a fatal problem in reliability or quality.

In order to prevent such a problem, a method of completely bonding the lower plate and the upper plate by applying the black top formed on the upper part of the partition as a sealant is used. However, in this case, when a slurry-type black top sealant is applied to the upper part of the partition, the lower part of the partition Since it is easy to flow and contaminate the phosphor, it is necessary to form a black top precisely in a limited part of the upper part of the narrow partition wall, which makes it difficult to manufacture and also causes a problem in that the sealing performance and the contrast improvement effect are deteriorated. In particular, the smaller the size of the bulkhead, the wider the cell size, so in view of the current trend to reduce the size of the bulkhead, such a black top forming method is very inefficient.

As described above, in the conventional plasma display panel, a gap is generated because the bonding between the upper plate and the lower plate is not complete, and this gap generates a discharge noise due to resonance vibration at high altitude, thereby lowering the reliability and quality of the panel. This technique has been proposed to solve this problem by forming a sealant black top on the upper part of the bulkhead to bond the upper and lower plates. Since it may be formed, there is a problem that the phosphor is contaminated or the contrast characteristics deteriorate.

According to the present invention for solving the above-described problems, after forming a new second dielectric layer on the upper dielectric layer of the upper surface of the plasma display panel, patterning the region where the sealant black matrix is to be formed is defined, and then sealing agent on the defined region. Forming a black matrix and forming a protective film on the upper side thereof, the present invention provides a plasma display panel and a method of manufacturing the same, which are in close contact with the partitions of the lower plate when bonded to the lower plate to reduce the discharge noise and improve the contrast characteristics. There is a purpose.

In order to achieve the above object, the present invention includes a lower plate made of an address electrode, a lower substrate formed with a phosphor and a partition wall; An opaque sealant comprising a transparent electrode stacked on a transparent upper substrate, a bus electrode and a top dielectric layer, wherein at least a portion of the top dielectric layer portion of a region between the bus electrodes facing the partition wall is positioned inside the top dielectric layer. Characterized in that consisting of the top plate.

The upper dielectric layer may include a first dielectric layer formed on the transparent electrode and the bus electrode; The second dielectric layer is formed on the first dielectric layer and has a region in which the opaque sealant is located.

The opaque sealant is characterized in that the main component is PbO or Non-PbO oxide.

The opaque sealant is characterized in that the main component is a P ₂ O ₅ -SnO-based or Bi ₂ O ₃ -based material.

In addition, the present invention includes the steps of forming a first dielectric layer on the upper substrate formed with a transparent electrode and a bus electrode; Forming a second dielectric layer on the first dielectric layer, and then partially removing a region where a black matrix is to be formed; Applying a sealant to be used as a black matrix on the removed region of the second dielectric layer; And forming a protective film on the entire surface of the second dielectric layer except for the removed region of the sealant and the second dielectric layer.

The sealant is a flowable material including a low dielectric constant material, a frit, and an organic binder having a dielectric constant of 8 to 20, which is applied to the removed region of the second dielectric layer and then calcined under vacuum to remove the organic binder. Characterized in that it comprises a.

The present invention as described above will be described in detail through one embodiment as follows.

Figure 2a to 2e is a cross-sectional view showing the manufacturing process of an embodiment of the present invention, as shown in the process of effectively forming a sealant that can improve the adhesion to the lower plate while functioning as a black matrix on the upper plate of the PDP panel will be.

First, as shown in FIG. 2A, a transparent electrode (ITO) 21 is formed on the upper transparent substrate 20.

As shown in FIG. 2B, the bus electrode 22 is formed on the transparent electrode 21, and the first dielectric layer 23 is printed on the entire upper surface of the upper electrode 23 by screen printing and then fired.

As shown in FIG. 2C, the second dielectric layer 24 is also printed on the first dielectric layer 23 by screen printing, dried, coated with a dry film, and patterned to form a bus electrode 22. The area between the bus electrodes, that is, the lower plate partition wall facing area where the black matrix is to be formed, is removed in a line shape.

As shown in FIG. 2D, after the black encapsulant 25 is applied to a groove region including the second dielectric layer 23 from which the partial region is removed and the first dielectric layer 24 below, the black encapsulant 25 is applied. Primary firing is carried out at a temperature of 600 ° C. (optimum in the 400 ° C. range). The black sealant may include PbO or non-PbO oxide as a main material based on a frit that is a glass material for sealing, an organic binder, a solvent, and the like. However, when a high dielectric constant sealant having a Pb series (dielectric constant 32) is used, current density increases during panel discharge, thereby decreasing panel efficiency. Therefore, P ₂ O ₅ -SnO (dielectric constant 8) or Bi ₂ O ₃ (dielectric constant 19.6) material, which is a low dielectric constant material having a dielectric constant of 8 to 20, is used as a main component in order to prevent efficiency degradation. It is possible to increase the discharge efficiency of the panel by allowing a lower current to flow to the bus electrode than when using the electrifying material.

Since the sealant has fluidity, it is difficult to maintain the desired state when it is formed on a flat surface as it is, and when applied as a black top sealant on the partition wall of the lower plate as in the prior art, it flows down to contaminate the phosphor. Can be. Therefore, in the present invention, after forming a kind of mold using the second dielectric layer 24 to form a sealant at a desired thickness, the shape of the sealant can be easily maintained. . Further, as shown in the drawing, the droplets may be formed to be 5 [μm] to 20 [μm] higher than the surface of the second dielectric layer 24.

As shown in FIG. 2E, an MgO passivation layer 26 is formed on the entire upper surface of the formed structure to complete the top plate.

Subsequently, when the sealing electrode 25 is bonded to the lower plate on which the address electrode, the phosphor, and the partition wall are formed, resonance vibration is not generated at a high altitude because the sealant 25 is joined to the partition wall, thereby solving the discharge noise. The color of the twenty-five (25) can also serve as a black matrix. In particular, compared to the method of forming a sealant black matrix in the form of a black top on the partition wall, it is relatively easy to apply and has a high effective method, so that the yield and quality improvement can be expected at the same time.

3 is a perspective view of a portion of the upper surface of the PDP panel formed according to an embodiment of the present invention in a cross-sectional view, and as illustrated, a removal region in which a black sealant 25 to be used as a black matrix is formed in the second dielectric layer 24. It can be seen that the thickness is formed in the inside, the position is the boundary of the cell, that is, the area between the inter-cell bus electrodes. Although the influence of the dielectric constant of the black sealant 25 on the bus electrode is small as the dielectric is separated by the first dielectric material, as described above, the black sealant 25 mainly composed of a low dielectric constant material is used. The performance of the panel can be improved.

Immediately after the black encapsulant 25 is formed in the removal region of the second dielectric layer 24, the above-described vacuum firing is performed, which is performed when the upper and lower plates are joined together. This is because the black sealant 25 is also fired together. Without this plasticity, outgassing occurs during the removal of the organic binder, which can contaminate adjacent structures.

FIG. 4 is a cross-sectional view showing a structure in which the upper plate structure of FIG. 3 described above is bonded to a separately formed lower plate structure, and as shown, an address electrode 31, a lower plate dielectric 32, a partition 33, and a phosphor 34. ) Is formed by bonding the lower substrate 30 facing the upper plate structure of FIG. 3.

The partition 33 is in close contact with the calcined black sealant 25 formed in the second dielectric 24 removing portion of the upper plate, and is further fired in a high temperature bonding process for fixing the entire panel. It comes in close contact with no gaps. By the plasticity as described above, in this case, contamination by the organic binder does not occur.

That is, by forming the opaque sealant uniformly at an appropriate position through an easy process, it is possible to reduce the discharge noise at high altitude and to improve the contrast performance, thereby greatly improving the reliability and quality of the panel.

As described above, the plasma display panel and the method of manufacturing the same in which the discharge noise is reduced are defined by forming a new second dielectric layer on the upper dielectric layer of the upper surface of the plasma display panel and patterning the region where the sealant black matrix is to be formed. By forming a sealant black matrix in the positive region and forming a protective film thereon, the partition wall of the lower plate is brought into close contact with the formed sealant black matrix at the time of joining the upper plate and the lower plate on which the structure is formed to discharge by resonance vibration at high altitude. It has the effect of reducing noise and improving contrast characteristics.

Claims (14)

A lower plate comprising an address electrode, a lower substrate on which phosphors and partitions are formed; An opaque sealant comprising a transparent electrode stacked on a transparent upper substrate, a bus electrode and a top dielectric layer, wherein at least a portion of the top dielectric layer portion of a region between the bus electrodes facing the partition wall is positioned inside the top dielectric layer. Plasma display panel to reduce the discharge noise, characterized in that consisting of a top plate. The method of claim 1, wherein the top dielectric layer A first dielectric layer formed on the transparent electrode and the bus electrode; And a second dielectric layer formed on the first dielectric layer and having a region in which the opaque sealant is located. The method of claim 1, wherein the opaque sealant A plasma display panel with reduced discharge noise, comprising PbO oxide as a main component. The method of claim 1, wherein the opaque sealant A plasma display panel with reduced discharge noise, characterized by using a low dielectric constant material having a dielectric constant of 8 to 20. delete The method of claim 4, wherein the opaque sealant A plasma display panel with reduced discharge noise, characterized by a P ₂ O ₅ -SnO-based or Bi ₂ O ₃ -based material as a main component. Forming a first dielectric layer on the upper substrate on which the transparent electrode and the bus electrode are formed; Forming a second dielectric layer on the first dielectric layer, and then partially removing a region where a black matrix is to be formed; Applying a sealant to be used as a black matrix on the removed region of the second dielectric layer; And forming a protective film on the entire surface of the second dielectric layer except for the removed region of the encapsulant and the second dielectric layer. The method of claim 7, wherein the sealant A flowable material comprising a low dielectric constant material, a frit, and an organic binder having a dielectric constant of 8 to 20, which is applied to the removed region of the second dielectric layer and then calcined under vacuum to remove the organic binder. A method of manufacturing a plasma display panel with reduced discharge noise. The method of claim 7, wherein the sealant A method of manufacturing a plasma display panel with reduced discharge noise, comprising the step of first plasticizing at 200 ~ 600 ℃ before the top and bottom plate bonding to prevent contamination by gas discharge. 8. The method of claim 7, wherein forming the second dielectric layer and removing a portion thereof A method of manufacturing a plasma display panel with reduced discharge noise, comprising: printing and drying a dielectric layer through screen printing, coating a dry film, and then patterning and forming a mask, followed by patterning by sanding or etching. The method of claim 7, wherein the sealant formed in the removed region of the second dielectric layer And a discharge noise of 5 [µm] to 20 [µm] higher than the second dielectric layer. The method of claim 7, wherein the sealant A method of manufacturing a plasma display panel with reduced discharge noise, characterized in that it is bonded to the partition wall when bonded to the lower plate. The method of claim 7, wherein the sealant A method of manufacturing a plasma display panel with reduced discharge noise, which comprises PbO oxide as a main component. The method of claim 7, wherein the sealant A method of manufacturing a plasma display panel with reduced discharge noise, characterized by a P ₂ O ₅ -SnO-based or Bi ₂ O ₃ -based material as a main component.

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