KR100683667B1 - Plasma display panel - Google Patents

Abstract

It is an object of the present invention to provide a plasma display panel having a partition having a ventilation structure that prevents cross talk between charged particles through partition walls between adjacent light emitting cells and facilitates exhaustion. It is an object of the present invention to provide a plasma display panel having a structure that prevents crosstalk of silver charged particles and facilitates exhaust. To achieve this object, the present invention provides a front substrate, a back substrate, a front substrate and a back substrate. Barrier ribs interposed therebetween, light emitting cells partitioned by the barrier ribs, address electrodes extending over a row of light emitting cells, a first dielectric layer covering the address electrodes, and a row of light emitting cells in a row Covering the sustain electrode pairs extending in a direction crossing the extending direction of the electrodes and the sustain electrode pairs; A plasma display panel having a second dielectric layer and a discharge gas in a discharge space, wherein the partition has a stepped shape partitioning the light emitting cells in a diagonal direction, and an exhaust passage is formed between two adjacent partitions. Provided is a plasma display panel.

Description

Plasma display panel {Plasma display panel}

1 is a plan view illustrating a partition wall adopted in a conventional plasma display panel.

2 is a perspective view showing another conventional plasma display panel;

3 is a cross-sectional view taken along line III-III of FIG. 2,

4 is a perspective view schematically showing a plasma display panel according to the present invention;

FIG. 5 is a plan view illustrating a structure of a partition wall, a sustain electrode pair, and an address electrode of the plasma display panel of FIG. 4;

FIG. 6 is a plan view illustrating a phosphor coated in the partition of FIG. 5;

7 is a perspective view illustrating one example of a manufacturing process of applying the phosphor of FIG. 6.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 122: front substrate

123: sustain electrode pair 124: common electrode

124a: transparent common electrode 124b: bus common electrode

125 scanning electrode 125a transparent scanning electrode

125b: bus injection electrode 126: second dielectric layer

128: shield 132: rear substrate

135: address electrode 136: rear dielectric layer

138: phosphor 140: partition wall

141: vertical partition 142: horizontal partition

145: connecting portion 166: first dielectric layer

C: light emitting cell Dr: light emitting cell diagonal inclination direction

Re: exhaust passage θc: slope of connection

θr: exhaust passage slope R: red phosphor

G: green phosphor B: blue phosphor

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which a structure of a partition wall is improved so that ventilation is facilitated after the front substrate and the rear substrate are coupled.

Recently, a plasma display panel, which is drawing attention as a replacement of a conventional cathode ray tube display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. Phosphors formed in a predetermined pattern by the ultraviolet rays are excited to obtain a desired image. Such a plasma display panel can be classified into a direct current type and an alternating current type according to the discharge type. In the DC plasma display panel, the electrodes are exposed to the discharge space so that the movement of charged particles is directly performed between the corresponding electrodes. In the AC plasma display panel, at least one electrode is covered with a dielectric layer, so that the direct charges of the corresponding electrodes are mutually reduced. The discharge is performed by the electric field of the wall charge instead of the movement of.

The partition wall adopted in the conventionally adopted plasma display panel is a stripe type vertical partition wall formed along the address electrode. The vertical partition wall is formed to cross the sustain electrode pair of the front substrate and partitions the left light emitting cell and the right light emitting cell. In the case of employing such a stripe-type partition wall, the upper light emitting cell and the lower light emitting cell are opened. Therefore, there is an advantage that the passage necessary for exhaust is sufficiently secured and the exhaust is easy.

However, since ultraviolet rays and visible light due to the discharge can move smoothly to neighboring light emitting cells arranged above and below, the ultraviolet rays due to the discharge are wasted and the luminance is lowered. In addition, cross-talk and mis-discharge may occur due to interference of charged particles between neighboring light emitting cells.

In order to solve this problem, as shown in FIG. 1, the partition 41 adopted in the plasma display panel disclosed in Japanese Patent Laid-Open No. 2001-035392 has a convex portion 41 'that is convex in the non-discharge area Nc. The phosphor 38 is formed in the light emitting cell including the bulge. In this case, the partition wall 41 is a vertical partition wall formed parallel to the address electrode 35 so as to be orthogonal to the common electrode 24 and the scan electrode 25.

Since the space | interval between the adjacent partition walls 41 becomes narrow in the non-discharge area | region Nc, generation | occurrence | production of the crosstalk of a charged particle can be suppressed to some extent. However, as a recent display has a high-definition screen, in order to implement the high-definition screen, the distance between adjacent light emitting cells is narrowed and the driving voltage is increased.

For this reason, it is difficult to suppress the occurrence of erroneous discharge and crosstalk in the partition structure as described above. Furthermore, the phosphor 38 is also applied between the bulk portions 41 ', so that crosstalk of charged particles occurs more frequently between the adjacent partition walls 41.

Therefore, in order to realize a high-definition screen, a recent plasma display panel is formed to intersect with the address electrode in addition to the vertical partition wall formed along the address electrode, and cross-talk of charged particles that may occur between the upper and lower light emitting cells at the boundary thereof. A matrix type partition wall having a transverse partition wall is provided.

FIG. 2 schematically shows a plasma display panel having a conventional matrix type partition wall, and FIG. 3 shows a cross section taken along line III-III of FIG. As shown in FIGS. 2 and 3, the AC plasma display panel 10 having the matrix-type partition wall is coupled to a front substrate 22 that displays an image to a user and spaced apart from and opposed to the front substrate. A rear substrate 32 is provided.

A common electrode 24 and a scan electrode 25 are arranged in pairs on the lower surface of the front substrate 22, and the common electrode 24 and the scan electrode 25 are arranged opposite to a surface on which the common and scan electrodes 24 and 25 of the front substrate 22 are disposed. The address electrode 35 is disposed on the top surface of the face substrate 32 so as to intersect the electrodes 24 and 25 of the front substrate 22. The common electrode 24 of the front substrate 22 includes a transparent common electrode 24a and a bus common electrode 24b formed on one side of the bottom surface of the transparent common electrode. In addition, the scan electrode 25 is usually composed of a transparent scan electrode 25a and a bus scan electrode 25b. The transparent scan electrode 25a and the transparent common electrode 24a are usually transparent electrodes made of indium tin oxide (ITO) and have a large line resistance. Accordingly, a bus scan electrode 25b and a bus common electrode 24b made of a metal material and formed in a narrow width are disposed on the lower surface of the transparent scan electrode 25a and the transparent common electrode 24a, respectively, to reduce line resistance. The space formed by the pair of common, scan electrodes 24 and 25 and the address electrodes 35 intersecting the same form one discharge space as a unit light emitting cell.

In this manner, the front dielectric layer 26 is embedded in the lower surface of the front substrate 22 provided with the scan electrodes 24 and 25 and the upper surface of the back substrate 32 provided with the address electrode 35, respectively. ) And backside dielectric layer 36 are formed. A protective film 38 made of MgO is formed on the lower surface of the front dielectric layer 26, and a matrix type that maintains a discharge distance on the upper surface of the rear dielectric layer 36 and prevents electro-optic crosstalk between light emitting cells. The partition 40 is formed. The partition wall 40 is formed along the address electrode, and is formed to intersect the vertical partition 41 between the left and right light emitting cells and the address electrode, and the horizontal partition 42 partitioning between the upper and lower light emitting cells. ). In this case, the horizontal bulkhead 42 and the vertical bulkhead 41 are connected to each other.

Red, green, and blue phosphors 38 are formed on both side surfaces of the barrier rib 40 inside the light emitting cell and on an upper surface of the rear dielectric layer 36 on which the barrier rib 40 is not formed. Is applied.

The matrix-type partition wall has a horizontal partition wall 42 formed to intersect the address electrode 35 in addition to the vertical partition wall 41 for preventing crosstalk between the left and right light emitting cells and preventing crosstalk between the upper and lower light emitting cells. do. Therefore, each of the light emitting cells is formed in a form surrounded by a partition wall so that ultraviolet rays and visible light due to discharge are not transmitted to adjacent light emitting cells, thereby preventing crosstalk due to charged particles between adjacent light emitting cells left and right and up and down. It is possible to prevent erroneous discharge due to the crosstalk.

However, in order to solve the problems caused by the stripe-type barrier ribs, when the matrix-type barrier rib structure is adopted, each of the light emitting cells is blocked by the barrier ribs, and thus the ventilation resistance inside the plasma display panel increases, so that The smooth flow of gas is blocked, so exhaust is extremely difficult, and the time required for exhaust is very long.

In addition, when residual gas is present in the discharge region due to incomplete exhaust gas, the residual gas acts as a cause of erroneous discharge by changing the driving conditions in the light emitting cell.

The present invention is to solve a number of problems, including the above problems, to prevent the cross-talk of the charged particles through the partition between the adjacent light emitting cells, while reducing the time for the residual gas is exhausted and smooth exhaust It is an object of the present invention to provide a plasma display panel having a partition having a ventilation structure.

In order to achieve the above object, the present invention is:

A front substrate;

A back substrate;

Barrier ribs disposed between the front substrate and the rear substrate;

Light emitting cells partitioned by the partition walls; address electrodes extending over a row of light emitting cells;

A first dielectric layer covering the address electrodes;

Sustain electrode pairs extending in a direction crossing the direction in which the address electrode extends over one row of light emitting cells;

A second dielectric layer covering the sustain electrode pairs; And

In the plasma display panel having a discharge gas in the discharge space,

The partition wall has a stepped shape partitioning the light emitting cells in a diagonal direction,

A plasma display panel includes an exhaust passage formed between two adjacent partition walls. The partition wall includes: a vertical partition wall partitioning adjacent light emitting cells in a horizontal direction; a horizontal partition wall partitioning adjacent light emitting cells in a vertical direction; And a connecting portion connecting the vertical bulkhead portion and the horizontal bulkhead portion, and the connecting portions of two adjacent partition walls are spaced apart from each other.

In this case, the connecting portion is preferably inclined in the direction in which the exhaust passage is formed.

In addition, it is preferable that the phosphors disposed in the light emitting cells defined by two adjacent partitions are spaced apart from each other.

Here, the phosphors disposed in the light emitting cells defined by two adjacent partitions are preferably phosphors emitting the same color.

On the other hand, the address electrode is preferably formed on the upper surface of the back substrate.

In this case, the sustain electrode pairs may be formed on the bottom surface of the front substrate, and the front substrate and the back substrate may be formed to face each other at a predetermined interval.

In addition, a protective film is preferably formed on the second dielectric layer. In this case, the protective film is preferably formed of MgO. Here, the sustain electrode pair is a scan electrode and the scan electrode which generate an address discharge together with the address electrode. In addition, it is preferable that the common electrode is configured to generate a sustain discharge.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 and 5, the plasma display panel 100 according to the present invention includes a front substrate 122, a rear substrate 132, a light emitting cell C, address electrodes 135, and a first substrate. The first dielectric layer 136, the sustain electrode pairs 123, the second dielectric layer 126, and the discharge gas 160 are provided. Figure 4 illustrates an embodiment according to the present invention, the present invention is not limited thereto, and may have a variety of other structures. The partition walls 140 are disposed between the front substrate 122 and the rear substrate 132 which are typically glass substrates. The light emitting cell C is partitioned by the partition walls 140. In the light emitting cell C, an address electrode 135 having a predetermined pattern and a pair of sustain electrodes 123 extending in a direction crossing the direction in which the address electrode 135 extends are formed.

The address electrode 135 has a predetermined pattern, for example, a stripe type or a serpentine pattern, and one or more are formed in each light emitting cell C. The address electrode 135 generates an address discharge and is covered by the first dielectric layer 136.

Here, the first dielectric layer 136 may be formed on the top surface of the rear substrate 132 as shown in FIG. In this case, the address electrode 135 is formed on the top surface of the back substrate 132 in a predetermined pattern, and the first dielectric layer 136 is formed to cover the address electrode 135.

This one pair of sustain electrodes 123 typically includes a common electrode 124 and a scan electrode 125. The sustain electrode pairs 123 may have a predetermined pattern. For example, the sustain electrode pairs 123 may be arranged in a stripe type pattern, a serpentine pattern, a pattern having a T-shaped uneven portion, or a pattern separated from each other. The scan electrode 125 together with the address electrode 135 generates an address discharge. The common electrode 124 generates a sustain discharge together with the scan electrode 124. The sustain electrode pairs 123 are covered by the second dielectric layer 126.

The sustain electrode pairs 123 may be formed on the bottom surface of the front substrate 122. In this case, it is preferable that the sustain electrode pairs 123 are formed on the bottom surface of the front substrate 122, and the sustain electrode pairs 123 are covered by the second dielectric layer 126. In this case, as shown in FIG. 4, the common electrode 124 is formed on the lower surface of the front substrate and the lower surface of the transparent common electrode, respectively, and is formed on the lower surface of the transparent common electrode. The bus common electrode 124b may be provided to reduce the voltage drop.

In addition, the scan electrode 125 is formed on the lower surface of the front substrate, respectively, and the bus scanning electrode is formed on the lower surface of the transparent scan electrode to reduce the voltage drop caused by the resistance of the transparent scan electrode during discharge. 125b may be provided. However, the present invention is not limited thereto, and unlike FIG. 5, the bus electrode 124 and the scan electrode 125 may be formed of only the transparent electrodes 124a and 125a or may be composed of only the bus electrodes 124b and 125b. .

It is preferable that the passivation layer 128 is formed on the second dielectric layer 126. The passivation layer 128 protects the second dielectric layer 126 from sputtering of ions, and has a characteristic of having a relatively high secondary electron generation coefficient when low energy ions hit the surface during discharge. ) Lowers the driving and holding voltages. In this case, the protective film 128 is preferably formed of a film of MgO material.

A discharge gas 160 is formed in the light emitting cell C between the front substrate 122 and the rear substrate 132 as shown in FIG. 5. The discharge gas 160 generally has a pressure of about 300 to 400 Torr. As the discharge gas 160, a Penning mixed gas is mainly used. A buffer gas is formed of He, Ne, Ar, or a mixture thereof, and is used as a source of vacuum ultraviolet light that emits phosphors. A small amount of Xe gas is used mixed.

The partition walls 140 are disposed between the front substrate 122 and the rear substrate 132. The partition walls 140 are formed between the light emitting cells C to partition the light emitting cells C, and prevent the charged particles from crosstalk between the light emitting cells. The one partition wall 140 diagonally crosses the light emitting cells. It has a step shape partitioned by In this case, an exhaust passage Re is formed between adjacent stepped partition walls.

As shown in FIG. 4 and FIG. 5, as one embodiment of the barrier rib structure, one barrier rib 140 includes a horizontal barrier rib portion 142, a vertical barrier rib portion 141, and a connection portion for each light emitting cell C. 145 may be provided.

The vertical partition 141 partitions adjacent light emitting cells C in the horizontal direction. Thus, as shown in FIG. 5, the left light emitting cell and the right light emitting cell are partitioned at the boundary thereof, and are generally formed to intersect the sustain electrode pairs 123 extending in the horizontal direction. Partition the cells longitudinally. Therefore, as shown in FIG. 5, the upper and lower light emitting cells are partitioned at the boundary thereof, and are formed to intersect the address electrodes 135 extending in the vertical direction.

The horizontal bulkhead part 142 and the vertical bulkhead part 141 are connected by the connection part 145. In this case, the connecting portions 145 of two adjacent partitions are spaced apart. As a result, a connection passage 155 having a predetermined clearance is formed between the connection portions of adjacent partition walls. Accordingly, the light emitting cells C in the diagonal direction divided by the one partition wall and the connection passage 155 connected to the light emitting cells become one exhaust passage Re. Unlike the partition wall, the entire light emitting cell C may be connected in a diagonal direction of the plasma display panel to form one exhaust passage Re.

It is preferable that the connecting portion 145 has an inclination θr equal to the inclination θc of the direction Dr in which the exhaust passage Re is formed. As a result, the connecting passage 155 formed between the connecting portions 145 of the adjacent light emitting cells C is inclined in the same direction as the entire exhaust passage Re, so that residual gas can be efficiently discharged in the shortest time. to be. In addition, it is preferable that the phosphors 138 disposed in the light emitting cell defined by two adjacent partitions 140 are spaced apart from each other. That is, it is preferable that the phosphor is not applied in the connection passage 155, which is to prevent the charged particles from crosstalk to the neighboring light emitting cells through the connection passage 155 formed between the connection portions 145.

That is, when the phosphor 138 is formed on the connection passage 155 in contact with a neighboring light emitting cell, the light emission is visible by the phosphor 138 applied in the adjacent connection passage 155 in addition to the selected light emitting cell. Light rays are emitted, which makes it easy to crosstalk to light emitting cells adjacent to the connection passage 155. Therefore, in order to prevent this, it is preferable that the phosphor 138 is not applied in the connection passage 155.

Meanwhile, as shown in FIG. 6, it is preferable that phosphors emitting the same color are applied to the light emitting cells defined by two adjacent partitions. In other words, all the phosphors disposed in the light emitting cells forming one exhaust passage Re in the diagonal direction of the light emitting cells are red phosphors R coated in red, green phosphors G coated in green, or blue. The coated blue phosphor (B) is preferable. This is because the light emitting cells defined by the two adjacent partitions are coated with the phosphors 138 emitting the same color, thereby avoiding color mixing due to the fluorescence of the phosphors when the phosphor is applied, and the color arrangement of the phosphors is spatially dispersed to provide finer detail. Stable representation of the image is possible.

An embodiment of a method of applying a phosphor having such a color structure to a light emitting cell is shown in FIG. 7. The light emitting cell partitioned by the partition wall 140 may be coated by the phosphor 138 by spraying the phosphor by the nozzle 70.

FIG. 7 illustrates a process in which the red phosphor R is applied, which will be described in detail with reference to FIG. 7. The mask 80 is disposed between the nozzle 70 and the partition walls 140. The mask has a red opening 80r having the same size as that of the light emitting cell.

Therefore, when the red phosphor is sprayed from the nozzle 70, the phosphor R is not applied to the partition wall 140 except for the red opening 80r. In this case, the red opening 80r is disposed to correspond to the light emitting cell to which the red phosphor R is coated. Therefore, the red phosphor R is applied only to the light emitting cells corresponding to the red openings 80r. The driving method for driving the plasma display panel 100 having such a structure realizes a gray level necessary for displaying an image by adjusting the number of sustain discharges according to the video data, and expressing such gray levels. In general, an ADS (Address and Display Period Separated) method is used in which one frame is divided into several subfields having different discharge times.

Each of the subfields is further divided into a reset period for uniformly discharging the discharge, an address period for selecting the light emitting cells to emit light, and a sustain period for erasing gray levels according to the number of discharges.

In the address period, when a predetermined voltage is applied to the address electrode 135 and the scan electrode 125, a light emitting cell for emitting light is selected, and an address discharge occurs between the two electrodes, so that wall charges are formed on the front dielectric layer 126. Is charged. Then, in the sustain period, a predetermined voltage is alternately applied between the common electrode 124 and the scan electrode 125, so that wall charges move between the common electrode 124 and the scan electrode 125 to discharge gas. This causes the sustain discharge, which causes the discharge gas to generate ultraviolet rays, which excite the phosphor 138 to form an image.

The plasma display panel of the present invention having the above structure and function has the following effects.

First, by adopting a barrier rib of a lattice structure, crosstalk between adjacent light emitting cells and erroneous discharge can be prevented, thereby improving light efficiency.

Second, the exhaust passage can be secured in the diagonal direction of the light emitting cell to improve the exhaust capacity and shorten the exhaust time.                     

Third, since the color distribution of the phosphor is spatially dispersed, a more detailed image can be stably represented.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and any person skilled in the art to which the present invention pertains may have various modifications and equivalent other embodiments. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (10)

Front substrate; A rear substrate formed to face the front substrate at a predetermined distance from the front substrate; Barrier ribs disposed between the front substrate and the rear substrate; Light emitting cells partitioned by the partition walls; Address electrodes extending over one row of light emitting cells; A first dielectric layer covering the address electrodes; Sustain electrode pairs extending in a direction crossing the address electrode; A second dielectric layer covering the sustain electrode pairs; And A plasma display panel comprising: a discharge gas in the discharge space; Each of the barrier ribs has a staircase shape partitioning the light emitting cells in a diagonal direction, the vertical partition portion partitioning adjacent light emitting cells in a horizontal direction, a horizontal partition portion partitioning adjacent light emitting cells in a vertical direction, and the vertical partition wall and a horizontal And a connection portion connecting the partition walls, wherein the connection portions of two adjacent partition walls are spaced apart from each other, and an exhaust passage is formed in a diagonal direction between the two adjacent partition walls. delete The method of claim 1, And the connection portion is inclined in a direction in which an exhaust passage is formed. The method of claim 1, Wherein the phosphors disposed in the light emitting cells defined by two adjacent partitions are spaced apart from each other. The method of claim 1, And the phosphors disposed in the light emitting cells defined by two adjacent partitions are all phosphors emitting the same color. The method of claim 1, And the address electrode is formed on an upper surface of the back substrate. The method of claim 6, The sustain electrode pairs are formed on the lower surface of the front substrate. The method according to claim 1 or 7, A protective film is formed on the second dielectric layer. The method of claim 8, The protective film is plasma display panel, characterized in that formed of MgO. The method of claim 1, And the sustain electrode pair includes a scan electrode for generating an address discharge together with the address electrode and a common electrode for generating a sustain discharge together with the scan electrode.

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