KR100708672B1 - Plasma display panel - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention aims to reduce the failure rate occurring when arranging partition walls for manufacturing a plasma display panel, and to minimize the increase of panel temperature and increase of reactive power. To achieve this object, the present invention provides a transparent front surface. A rear substrate disposed to face the substrate and the front substrate; A partition wall disposed between the front substrate and the rear substrate and having a horizontal partition wall and a vertical partition wall defining discharge cells which are spaces for generating a discharge; Support portions connected between the horizontal partition walls adjacent to each other to support the horizontal partition walls; Electrodes disposed between the front substrate and the rear substrate; A phosphor layer disposed in the discharge cell; And a discharge gas existing in the discharge cell, wherein the horizontal partition wall extends in one direction, the vertical partition wall extends in a direction crossing the direction in which the horizontal partition wall extends, and in a plane parallel to the front substrate. The longitudinal bulkhead of the transverse bulkhead in which the transverse bulkhead is cut in a plane parallel to the front substrate with a width of the longitudinal bulkhead that is a length in a direction in which the transverse bulkhead in which the vertical bulkhead is cut is extended. The width of the horizontal bulkhead divided by the length in the extending direction is greater than or equal to 1.2 and less than or equal to 1.8, wherein the width of the horizontal bulkhead and the width of the vertical bulkhead are constant along the extending direction. Provide a display panel.

Description

 Plasma display panel {Plasma display panel}

1 is an exploded perspective view showing a plasma display panel of the present invention;

2 and 3 are schematic diagrams for explaining a process for repairing when a failure occurs in the partition wall,

4 is a plan view of a rear panel of the plasma display panel of the present invention.

<Description of Symbols for Major Parts of Drawings>

100: plasma display panel

110: front panel, 120: rear panel

130: bulkhead 130a: horizontal bulkhead

130b: vertical bulkhead 130c: support portion

117: electrode 114: sustain electrode

122: address electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to minimizing a rise in panel temperature and an increase in reactive power while reducing a failure rate generated when arranging partition walls for manufacturing a plasma display panel.

In general, a plasma display panel is an apparatus for displaying an image using gas discharge, and is easy to be enlarged, and has excellent display capability such as display capacity, brightness, contrast, afterimage, viewing angle, etc. It is in the spotlight as a device that can.

In such a plasma display panel, a discharge occurs in a discharge cell filled with a discharge gas by a direct current or an alternating voltage applied between electrodes, and ultraviolet rays emitted from the discharge gas excite the phosphor to emit visible light, thereby generating an image. Implement

The plasma display panel has a high defective rate due to the complexity and precision of the manufacturing process, and particularly, a high defective rate due to damage of the partition wall among the portions where the defective display occurs. In addition, how much the failure rate of the partition wall can be reduced greatly affects the manufacturing cost of the plasma display panel.

In addition to lowering the failure rate of the partition wall, it is equally important that the failure rate of the partition wall can be easily repaired to ensure the same quality as the original plasma display panel. That is, if the plasma display panel having a failure in the partition wall can be easily repaired at a low cost, the manufacturing cost of the plasma display panel can be greatly reduced because the plasma display panel can be reused.

The present invention aims to solve the following problems including the above problems.

Firstly, an object of the present invention is to provide a partition structure for minimizing a defective rate of partition walls.

Secondly, an object of the present invention is to provide a means for easily repairing a failure of a partition and preventing an increase in reactive power and a rise in temperature which are problematic in driving a plasma display panel.

In order to achieve the above object, the present invention provides a transparent front substrate and a rear substrate disposed to face the front substrate, and a horizontal partition wall disposed between the front substrate and the rear substrate to define discharge cells which are spaces for generating a discharge. And a barrier rib having a vertical barrier rib, electrodes disposed between the front substrate and the rear substrate, a phosphor layer disposed in the discharge cell, and a discharge gas existing in the discharge cell. Extending in the direction in which the vertical bulkhead extends in a direction crossing the direction in which the horizontal bulkhead extends, and in the direction in which the horizontal bulkhead of the longitudinal bulkhead cross section in which the vertical bulkhead is cut in a plane parallel to the front substrate extends. The transverse bulkhead crossing of the transverse bulkhead in a plane parallel to the front substrate with a width of the vertical bulkhead having a length of Of the vertical partition wall the value obtained by dividing the length of the width of the horizontal partition wall of the extending direction is larger than or equal to 1.2, provides a plasma display panel, characterized in that less than or equal to 2.

In this case, in the plasma display panel, it is more preferable that the value obtained by dividing the width of the horizontal partition wall by the width of the vertical partition wall is larger than 1.2 or smaller than 1.6.

The partition wall of the plasma display panel may further include a support part supporting the horizontal partition walls between adjacent horizontal partition walls.

The electrodes of the plasma display panel may include sustain electrodes extending in a direction in which the horizontal partition walls extend, and address electrodes extending in a direction in which the vertical partition walls extend so as to cross the sustain electrodes and the discharge cell. Preferably, the sustain electrodes are supported by the front substrate, and the address electrodes are supported by the rear substrate.

The plasma display panel may further include a front dielectric layer supported on the front substrate to cover the sustain electrodes and a rear dielectric layer supported on the rear substrate to cover the address electrodes.

On the other hand, the plasma display panel further comprises a protective film disposed in the discharge cell.

Hereinafter, exemplary embodiments of the plasma display panel 100 of the present invention will be described with reference to FIGS. 1 to 2.

The plasma display panel 100 includes a front panel 110 and a rear panel 120. In this case, the front panel 110 has a transparent front substrate 111 having a thickness of approximately 2.8 mm made of soda glass, etc., and the rear panel 120 is disposed to face the front substrate 111. A substrate 121 is provided.

At this time, the front substrate 111 is preferably formed of a material such as transparent soda glass so as to transmit visible light generated from the phosphor layer 125 described later, the back substrate is visible light generated from the phosphor layer 125 It is not necessarily transparent because it is not located on the optical path (hereinafter, referred to as the optical path image), which is the traveling path. Accordingly, the back substrate 121 may be formed of glass or the like, but may be formed of an opaque material such as metal or plastic.

On the other hand, the rear panel 100 is disposed between the front substrate 111 and the rear substrate 121 to form a horizontal partition wall 130a and a vertical partition wall 130b defining a discharge cell 116 which is a space causing a discharge. Equipped. In this case, the horizontal partition wall 130a extends in one direction, and the vertical partition wall 130b extends in a direction crossing the direction in which the horizontal partition wall 130a extends.

On the other hand, the width of the vertical partition wall which is a length in the direction in which the horizontal partition wall 130a of the cross section of the vertical partition wall 130b in which the vertical partition wall 130b is cut in a plane parallel to the front substrate 111 ( W1) (hereinafter referred to as the width of the vertical partition wall), the vertical partition wall 130b of the cross section of the horizontal partition wall 130a in which the horizontal partition wall 130a is cut in a plane parallel to the front substrate 111 extends. The width W2 of the transverse bulkhead (hereinafter referred to as the width of the transverse bulkhead), which is a length in a predetermined direction, is greater than or equal to 1.2 and less than or equal to two. In this case, more preferably, the value obtained by dividing the width of the transverse bulkhead by the width w1 of the vertical bulkhead may be greater than or equal to 1.2 and less than or equal to 1.6.

Hereinafter, the ratio of the widths of the vertical bulkhead and the horizontal bulkhead will be described in detail later.

On the other hand, the discharge cells 126 constituting the unit pixel of the plasma display panel 100 are limited by the horizontal barrier rib 130a and the vertical barrier rib 130b, and are limited to the matrix form as shown in FIG. 1. In addition, the matrix discharge cells 126 clearly limit the space in which the visible light is generated to prevent the visible light from mixing.

Meanwhile, although the shapes of the discharge cells 126 are represented in a rectangular shape in FIG. 1, the shapes of the discharge cells 126 are not necessarily rectangular, but may be limited to various polygons or circular shapes.

In this case, the partition 130 may be formed of a glass component including elements such as Pb, B, Si, Al, and O, and the like, and, as necessary, fillers such as ZrO2, TiO2, and Al2O3. And pigments such as Cr, Cu, Co, Fe, TiO2, and the like.

On the other hand, the partition wall 130 is applied to the front surface of the back substrate 121 or the front of the rear dielectric layer 123 to be described later, the partition wall material composed of the partition material described above, and then the mask pattern having a predetermined pattern It may be formed by a sandblasting method, which is disposed on the barrier rib paste and forms a predetermined shape by etching the portion of the mask pattern that is not covered by the accelerated abrasive particles.

Meanwhile, the partition 130 may be formed by a photolithography method including a photosensitive material in the partition paste to implement a predetermined shape on the partition through exposure and development.

On the other hand, the partition wall 130 should ensure a predetermined strength or more, and for this purpose, a calcination process is performed. In this case, the volatile material of the partition material is volatilized by the firing process to cause shrinkage of the partition wall material. Such shrinkage causes distortion of the discharge cells or distortion of the shape of the discharge cells. In addition, such shape distortion of the discharge cells causes the disposition of the electrodes to be not correctly aligned, causing an erroneous discharge and lowering the image.

In this case, the partition wall 130 may include a support part 130c for supporting the horizontal partition walls 130a between the horizontal partition walls 130a adjacent to each other. In this case, even when the above-described firing process is performed, The support 130c may prevent the partition walls defining the discharge cell from sinking due to the contraction of the partition wall and prevent the horizontal partition wall from collapsing or twisting.

The plasma display panel 100 includes electrodes 117 disposed between the front substrate 111 and the rear substrate 121. In this case, the electrodes 117 are arranged so that the vertical electrodes 130 intersect with the sustain electrodes 114 extending in the direction in which the horizontal barrier ribs 130a extend and the sustain electrodes 114 and the discharge cell 126. It is preferable to include the address electrodes 122 extending in the extending direction.

On the other hand, it is preferable that the sustain electrodes 114 are supported and disposed on the front substrate, and as shown in FIG. 1, the sustain electrodes 114 may be disposed in pairs including an X electrode 113 and a Y electrode 112.

In this case, the sustain electrodes 114 are illustrated as being disposed on the rear surface 111a of the front substrate 111, but need not necessarily reflect the visible light on the front surface of the front substrate 111. A layer that performs a separate function, such as a reflective layer to reflect or a UV reflecting layer, may be disposed, and the electrode pairs may be disposed on a front surface of the layer, and in some cases, a front surface of the front substrate is disposed. Since it may be disposed in a state covered by a specific protective layer, there is no limitation on the arrangement position of the sustain electrodes 114, and the sustain electrodes 114 are sufficient to be supported by the front substrate 111 and disposed. Do.

On the other hand, since the Y electrode 112 and the X electrode 113 are each supported and disposed on the front substrate 111, the Y electrode 112 and the X electrode 113 are disposed on the optical path, and thus, the X electrode 112 and the Y electrode 113 are In order to transmit visible light, transparent electrodes 112b and 113b formed of indium thin oxide (ITO) or the like are preferably provided.

In this case, since the transparent electrode generally has high resistance and may cause unevenness of discharge in a large panel, the X electrode 113 and the Y electrode 112 to form a uniform electric field between the discharge cells 126. It is preferable to have the bus electrodes 112a and 113a formed of a metal having high conductivity.

Meanwhile, the bus electrodes 112a and 113a may be formed of various materials such as aluminum, copper, and chromium having high electrical conductivity and relatively low price.

Meanwhile, the front panel 110 may further include a front dielectric layer 115 supported and disposed on the front substrate 111 to cover the sustain electrodes 114. At this time, even if the front dielectric layer 115 does not exist, there is no difficulty in inducing discharge by forming an electric field inside the discharge cell 126 by applying a potential to the sustain electrodes 114, but the sustain electrodes ( When the charged particles are accelerated by applying a potential to the 114, the charged particles collide directly with the surfaces of the sustain electrodes 114 to shorten the lifetime of the electrodes, thereby covering the sustain electrodes 114. Preferably, the front dielectric layer 115 is disposed.

In addition, when the front dielectric layer 115 is disposed, wall charges are accumulated during the address discharge described later, and wall charges may be used in the sustain discharge, thereby reducing the magnitude of the potential to be applied during the sustain discharge.

On the other hand, since the front dielectric layer 115 is located on the optical path, it is preferable that the front dielectric layer 115 is formed of a transparent dielectric material.

The front panel 110 may further include a passivation layer 116 disposed to cover the front dielectric layer 115. In this case, the protective layer 116 serves to protect the front dielectric layer and the electrode pairs 114 covered by the front dielectric layer, and simultaneously discharges secondary electrons during collision of charged particles due to discharge. In charge of. At this time, MgO etc. are generally used as a material of the said protective film.

The plasma display panel 100 includes address electrodes 122 extending to intersect the sustain electrodes. At this time, more preferably, the address electrodes 122 are preferably supported by the rear substrate 121 and disposed. In this case, the meaning of being supported and disposed is the same as the meaning of the arrangement of the sustain electrodes 114.

In this case, the address electrodes 122 may be formed in a predetermined shape by the screen printing method or the photolithography method used in the arrangement of the sustain electrodes 114, and may be supported and disposed on the rear substrate.

The rear panel 120 may further include a rear dielectric layer 123 supported and disposed on the rear substrate 121 to cover the address electrode 122. Of course, even if the rear dielectric layer 123 is not disposed, there is no problem in driving the plasma display panel of the present invention. However, as described above, charged particles collide directly with the address electrode to damage the address electrode when the address discharge occurs. Because you can.

Meanwhile, when the address electrodes 122 are supported by the rear substrate and are disposed on the back substrate, the address electrodes 122 may be formed of a metallic material having good electrical conductivity since they are not in an optical path.

On the other hand, the rear panel 120 is disposed in the discharge cell 126, more preferably, the phosphor disposed in the space defined by the back substrate 121, the horizontal partition 130a and the vertical partition 130b. Layer 125.

Meanwhile, in order to implement a color image on the plasma display panel 100, the red light emitting cells and the green light emitting discharges are divided into red light emitting cells, green light emitting cells, and blue light emitting cells. Red, green, and blue light emitting phosphor layers may be disposed in each of the cell and the blue light emitting discharge cell.

In this case, the phosphor layer 125 is the discharge cell when the phosphor layer mixed with any one of a phosphor, a solvent, and a binder of a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor is disposed on the rear dielectric layer 123. It is formed by applying to at least a portion of the front surface of the rear dielectric layer 123 and the side surfaces of the horizontal partition wall 130a and the vertical partition wall 130b, and then undergoes drying and firing processes.

On the other hand, the red light emitting phosphor includes (Y, Gd) BO3: Eu3 + and the like, and the green light emitting phosphor includes Zn2Si04: Mn2 + and the like and BaMgAl10O17: Eu2 + and the like.

On the other hand, the discharge cell is filled with a discharge gas consisting of any one of neon (Ne), helium (He), or argon (Ar) including xenon (Xe) gas, or a mixed gas of two or more thereof. In this case, since the pressure of the discharge gas is in a vacuum state (0.5 atm), the pressure according to the vacuum of the discharge gas acts as a force for pressing the front substrate and the back substrate, and this pressure is supported by the partition wall 115. .

On the other hand, the front panel and the rear panel is coupled to the edge is sealed by a coupling member such as a frit (flit).

Hereinafter, a ratio of the width W2 of the horizontal bulkhead and the width W1 of the vertical bulkhead of the plasma display panel 100 of the present invention will be described with reference to FIGS. 2 and 3.

In general, the partition wall 130 is formed in a fine pattern as described above, and undergoes a complex process such as patterning, drying, and firing. As this process proceeds, the bulkhead is subjected to significant physical forces, so that failure of the bulkhead frequently occurs.

Therefore, in order to reduce the failure rate of the partition walls, it is desirable to increase the thickness of the partition walls so that the partition walls can sufficiently withstand the physical force, and there is no problem in realizing the image even if some of them are damaged.

Meanwhile, as shown in FIG. 2, a case in which a defective part 132 occurs in a partition due to a process problem will be described. In this case, when the defective portion 132 of the partition wall is generated, an error may occur when the plasma display panel is driven, and thus the image quality may be degraded. 3, the barrier rib can be repaired by completely removing the defective portion 132 and filling a predetermined filler in the defective portion 132.

In this case, since the address electrode 122 extends in the direction in which the vertical partition wall 130b extends, the horizontal partition wall 130a is disposed on the upper layer of the address electrode 122. Therefore, when a defective part is generated in the horizontal partition wall 130a and the defective part is removed to repair the problem, the address electrode 122 may be damaged.

At this time, the failure of the partition wall 130 can be repaired relatively easily, but the defect occurring in the address electrode 122 is almost impossible in the arrangement process of the address electrode 122. That is, since the address electrode 122 is disposed on the rear substrate in the manufacturing process of the rear panel 120, a later process such as partition wall arrangement is performed, so that the defect of the address electrode 122 may be repaired. Almost all other components placed on 한다 should be removed. Therefore, repair of this address electrode 122 is almost impossible.

Therefore, it is necessary to reduce the occurrence of the failure of the horizontal bulkhead 130a, and thus, the horizontal bulkhead 130a can be considered difficult to repair compared to the vertical bulkhead 130b, and eventually, the failure of the horizontal bulkhead 130a. In order to reduce the width, the width W2 of the horizontal bulkhead 130a needs to be thicker than the vertical bulkhead W1.

However, when a predetermined potential is applied to the electrodes 117, the molecules of the partition wall material are polarized due to the electric field generated by the potential applied to the electrodes 117, thereby causing a rotational movement, thereby generating heat. At this time, as the width W2 of the horizontal bulkhead increases, the heat generation increases, and as a result, the temperature of the plasma display panel increases.

At this time, if the temperature of the plasma display panel is excessively increased, the characteristics of the phosphor layer 125 are changed, so that desired image realization is difficult or thermal afterimage occurs, thereby degrading image quality. Therefore, it is necessary to prevent the temperature of the plasma display panel from excessively increasing, and therefore, there is a limit to widening the width W2 of the horizontal partition wall.

Meanwhile, the horizontal partition wall 130a defines discharge cells 126 together with the vertical partition wall 130b, and the discharge cells 126 embody an image of the plasma display panel 100. W2 has a relative size in relation to the width W1 of the vertical bulkhead. Therefore, under this consideration, the failure rate of the partition wall, the failure rate of the address electrode, and the panel temperature are compared based on the value obtained by dividing the width W2 of the vertical partition wall by the width W1 (hereinafter referred to as a reference value). Let's look at it.

Width of transverse bulkheads (W2) / Width of vertical bulkhead (W1) % Failure rate of transverse bulkhead Address electrode failure rate (%) Panel temperature (℃) One 5 One 47 1.2 1.5 0.3 47 1.4 0.2 0 49 1.6 0.0 0 50 1.8 0 0 50 2 0 0 52 2.2 0 0 59

Table 1 shows data based on a 42-inch SD plasma display panel.

In this case, as shown in Table 1, when the reference value is 1, that is, when the width of the horizontal bulkhead and the width of the vertical bulkhead are the same, the failure rate of the horizontal bulkhead was 5%, which was very high. However, when the reference value was 1.2, the failure rate of the transverse bulkhead was reduced to 1.5%, resulting in a sudden drop of approximately 70%. On the other hand, the address electrode failure rate, which occurs in the process of repairing the failure of the transverse bulkhead, also decreased rapidly from about 1% to 0.3%, about 70%.

On the other hand, since the temperature of the plasma display panel is maintained at 47 ° C., there is almost no increase in the temperature of the plasma display panel generated as the width W2 of the horizontal partition wall increases.

On the other hand, in the range where the reference value is 2, the failure rate of the horizontal bulkhead is continuously lowered so that no failure occurs, and the address electrode is the same. However, when the reference value exceeded 2, the temperature of the plasma display panel rose rapidly from 52 ° C to 59 ° C. This is a steep rise given that the temperature is a numerical increase of approximately 12%. Therefore, it is not preferable that the reference value exceeds 2 in consideration of deterioration of the phosphor layer of the plasma display panel.

Thus, the reference value is preferably greater than or equal to 1.2 and smaller than 2. On the other hand, the reference value is preferably greater than or equal to 1.2, and when the reference value continuously increases to 1.6, it can be seen that the failure rate of the transverse bulkhead is 0%. On the other hand, since the plasma display panel maintains a relatively stable temperature of 50 ° C, the reference value is more preferably greater than or equal to 1.2 and less than or equal to 1.6.

The present invention achieves the following effects.

Firstly, a partition structure is provided to minimize the failure rate of the partition.

Secondly, it provides an optimal range of the width of the horizontal bulkhead and the width of the vertical bulkhead so as to easily repair the failure of the fault of the partition wall and to prevent the increase of reactive power and the rise of the temperature, which are problematic when the plasma display panel is driven.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (7)

A transparent front substrate and a rear substrate disposed to face the front substrate; A partition wall disposed between the front substrate and the rear substrate and having a horizontal partition wall and a vertical partition wall defining discharge cells which are spaces for generating a discharge; Support portions connected between the horizontal partition walls adjacent to each other to support the horizontal partition walls; Electrodes disposed between the front substrate and the rear substrate; A phosphor layer disposed in the discharge cell; And And a discharge gas existing in the discharge cell, The horizontal bulkhead extends in one direction, and the vertical bulkhead extends in a direction crossing the direction in which the horizontal bulkhead extends, and the horizontal bulkhead of the vertical bulkhead cross section in which the vertical bulkhead is cut in a plane parallel to the front substrate. The width of the transverse bulkhead that is the length of the longitudinal bulkhead of the transverse bulkhead cross section in which the transverse bulkhead is cut in a plane parallel to the front substrate with the width of the vertical bulkhead that is the length in the extended direction. The division value is greater than or equal to 1.2 and less than or equal to 1.8, wherein the width of the horizontal bulkhead and the width of the vertical bulkhead are constant along the extending direction. The method of claim 1, And a value obtained by dividing the width of the horizontal bulkhead by the width of the vertical bulkhead is greater than 1.2 or less than 1.6. delete The method of claim 1, The electrodes may include sustain electrodes extending in a direction in which the horizontal barrier ribs extend, and address electrodes extending in a direction in which the vertical barrier ribs extend so as to cross the sustain electrodes and the discharge cell. . The method of claim 4, wherein And the sustain electrodes are supported on the front substrate and the address electrodes are supported on the rear substrate. The method of claim 5, And a front dielectric layer supported on the front substrate to cover the sustain electrodes, and a rear dielectric layer supported on the back substrate to cover the address electrodes. The method of claim 1, And a protective film disposed in the discharge cell.

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