KR100637141B1 - Plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel having a structure that prevents crosstalk of charged particles and at the same time exhausts smoothly. In order to achieve this object, the present invention is a front substrate, a lower surface of the front substrate in a predetermined pattern A plurality of sustain electrode pairs which are common and are formed in pairs for each unit discharge cell, a first front dielectric layer filling the sustain electrode pairs, and a plurality of second electrodes having a predetermined pattern on the bottom surface of the first front dielectric layer Front dielectric layers, a rear substrate coupled to be spaced apart from the front substrate, a plurality of address electrodes formed in a predetermined pattern by crossing pairs of sustain electrodes on an upper surface of the rear substrate, a rear dielectric layer filling the address electrode, and a second A first partition wall and a second front dielectric layer which intersect the front dielectric layer and have a constant gap with the front substrate; If the contact has an upper surface, and a second partition wall having a height lower than the first bank, there is provided a plasma display panel provided with a phosphor is applied in the partition wall, and discharge cells formed on the upper surface of the rear dielectric layer.

Description

Plasma display panel {Plasma display panel}

1 is a perspective view showing a conventional conventional plasma display panel,

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1,

3 is a cross-sectional view showing a cross section of another conventional plasma display panel;

4 is a cross-sectional view showing a cross section perpendicular to the cross section of FIG. 3,

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

6 is a plan view illustrating partition walls and sustain electrode pairs of the plasma display panel of FIG. 5;

7 is a cross-sectional view taken along the line VII-VII of FIG. 6,

8 is a cross-sectional view taken along the line VII-VII of FIG. 6,

9 is a cross-sectional view taken along the line VII-VII of FIG. 6,

FIG. 10 is a graph illustrating mis-discharge probability versus distance between the top surface of the first partition wall and the bottom surface of the first front dielectric layer;

11 is a plan view showing a modification of the sustain electrode pair employed in the plasma display panel of FIG.

12 is a plan view illustrating a modification of the bus electrode employed in the plasma display panel of FIG. 5.

Explanation of symbols on the main parts of the drawings

200: plasma display panel 222: front substrate

223: sustain electrode pair 224: common electrode

224a: common transparent electrode 224b: common bus electrode

225: scanning electrode 225a: scanning transparent electrode

225b: scan bus electrode 226: first front dielectric layer

228: shield 232: backplane

235: address electrode 236: rear dielectric layer

238: phosphor 240: partition wall

241: first partition 242: second partition

266: second front dielectric layer D: upper surface width of second front dielectric layer

G: the gap between the first partition wall and the first front dielectric layer

H: height of second front dielectric layer

H1: gap between the upper surface of the first partition wall and the lower surface of the second front dielectric layer

L1: height of first partition wall L2: height of second partition wall

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which the structure of the front dielectric layer and the partition wall is improved to facilitate ventilation 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. The phosphor formed in a predetermined pattern by the ultraviolet rays is excited to obtain a desired image.

The plasma display panel may be classified into a direct current type and an alternating current type according to a 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 discharge cell.

By the way, when the stripe-type partition wall is adopted, the upper and lower discharge cells are opened so that a sufficient passage for the exhaust is secured and the exhaust is easy. Ultraviolet rays are wasted, which acts as a factor of lowering luminance. In addition, there is a concern that crosstalk and mis-discharge may occur due to interference of charged particles between neighboring discharge cells. In particular, as a display tends to implement a high definition screen, in order to implement the high definition screen, the distance between adjacent discharge cells is narrowed, and as the driving voltage increases, mis-discharge and crosstalk are frequently generated.

Therefore, in order to realize a high-definition screen, a recent plasma display panel has a horizontal partition wall formed to intersect the address electrode in addition to the vertical partition wall formed along the address electrode to prevent crosstalk between upper and lower discharge cells. A partition of the matrix type is provided.

FIG. 1 schematically shows a plasma display panel having a conventional matrix type partition wall, and FIG. 2 shows a cross section taken along the line II-II of FIG. As illustrated, the AC plasma display panel 10 having a matrix-type partition wall includes a front substrate 22 showing an image to a user and a rear substrate 32 spaced apart from and coupled to the front substrate. Equipped.

A common electrode 24 and a scan electrode 25 are arranged in pairs on the lower surface of the front substrate 22, and a rear surface of the front substrate 22 opposite to a surface on which the common and scan electrodes 24 and 25 are disposed. The address electrode 35 is disposed on the upper surface of the substrate 32 so as to intersect the electrodes 24 and 25 of the front substrate 22. The scan electrodes 24 and 25 common to the front substrate 22 are usually made of transparent electrodes 24a and 25a and bus electrodes 24b and 25b. The transparent electrodes 24a and 25a are transparent electrodes usually made of indium tin oxide (ITO). The lower electrodes of the transparent electrodes 24b and 25b are made of, for example, metal and have a narrow width in order to reduce line resistance. ) Is placed. 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 discharge 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. And a backside dielectric layer 36 is 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 discharge cells. The partition 40 is formed.

The partition wall 40 is formed along the address electrode, and is formed to intersect the vertical partition wall 41 partitioning between the left and right discharge cells and the address electrode, and the horizontal partition wall 42 partitioning between the upper and lower discharge 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 partition wall 40 inside the discharge cell and on an upper surface of the rear dielectric layer 36 on which the partition wall 40 is not formed. Is applied.

The driving method for driving the plasma display panel 10 having such a structure realizes gray levels necessary for displaying an image by adjusting the number of sustain discharges according to video data, and to express 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 generating a discharge, an address period for selecting a discharge cell to emit light, and a sustain period for expressing gray scale according to the number of discharges, and an erase period.

In the address period, when a predetermined voltage is applied to the address electrode 35 and the scan electrode 25, a discharge cell for emitting light is selected, and an address discharge occurs between the two electrodes, so that wall charges on the front dielectric layer 26 are generated. Is charged. Then, in the sustaining period, a predetermined voltage is alternately applied between the common electrode 24 and the scan electrode 25, so that wall charges move between the common electrode 24 and the scan electrode 25 to discharge gas. This causes sustain discharge, which causes the discharge gas to generate ultraviolet rays, which excite the phosphor 38 to form an image.

As described above, the matrix type partition wall is formed so as to intersect the address electrode 35 in addition to the vertical partition wall 41 that prevents crosstalk between the left and right discharge cells, and the horizontal partition wall 42 that prevents crosstalk between the upper and lower discharge cells. ). Therefore, each discharge cell 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 discharge cells, thereby preventing crosstalk due to charged particles between adjacent discharge cells in the left and right directions. 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 discharge cell is blocked by the barrier ribs, so that the ventilation resistance is increased inside the plasma display panel, thereby exhausting the exhaust. Since the smooth flow of gas is blocked, 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 discharge cell.

In order to solve this problem, in the AC plasma display panel described in Korean Patent Publication No. 2000-0048321, as shown in FIGS. 3 and 4, the common transparent electrode 124a and the common bus electrode 124b are formed. The front dielectric layer 126 protrudes between the sustain electrode pair 123 including the common electrode 124 and the scan electrode 125 including the scan transparent electrode 125a and the scan bus electrode 125b. In addition, the partition wall 140 is formed with the same height as the vertical partition wall 141 parallel to the address electrode 135 and the horizontal partition wall 142 crossing the address electrode 135. In this case, the horizontal partition wall 142 is in contact with the bottom surface of the front dielectric layer 126 protruding from the upper surface.

Accordingly, as shown in FIG. 3, the horizontal partition wall 142 and the front dielectric layer 126 intersect the upper and lower discharge cells to prevent crosstalk of the charged particles. . In contrast, as shown in FIG. 4, between the left and right discharge cells, a constant gap G is formed between the vertical partition wall 141 formed along the address electrode 135 and the front dielectric layer 126. The gap acts as a vent to allow exhaust gas to be released.

However, the protrusion height of the front dielectric layer 126 is large, and because the heights of the horizontal barrier rib 142 and the vertical barrier rib 141 are the same, the gap G between the front dielectric layer 126 and the vertical barrier rib 141 is increased. As a result, crosstalk is generated between adjacent discharge cells, thereby causing a problem of erroneous discharge. In addition, the area covered by the phosphor 138 on the side of the partition wall 140 is reduced, so that the front substrate transmittance of visible light is also lowered.

The present invention is to solve the various problems including the above problems, the barrier ribs and the front dielectric layer having a ventilation structure to prevent the cross-talk of the charged particles through the partition walls between adjacent discharge cells and at the same time smoothly exhaust. It is an object to provide a plasma display panel having a.

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

A front substrate;

A plurality of sustain electrode pairs, which are common and scan electrodes, formed in a predetermined pattern on a lower surface of the front substrate and formed in pairs for each unit discharge cell;

A first front side dielectric layer filling the sustain electrode pairs, and a plurality of second front side dielectric layers formed in a predetermined pattern on a lower surface of the first front side dielectric layer;

A rear substrate coupled to be spaced apart from the front substrate;

A plurality of address electrodes intersecting the sustain electrode pairs and formed in a predetermined pattern on an upper surface of the rear substrate;

A backside dielectric layer filling the address electrode;

And a first partition wall intersecting the second front dielectric layer, a first partition wall having a constant gap with the front substrate, and an upper surface contacting a bottom surface of the second front dielectric layer, and having a second partition wall having a lower height than the first partition wall. Barrier ribs formed on an upper surface of the rear dielectric layer; And

It provides a plasma display panel having a; a phosphor applied in the discharge cell.

Part of the first partition wall corresponding to the second front dielectric layer is preferably concave so that the height thereof is the same as the second partition wall.

In addition, the height of the second front dielectric layer is preferably 10 to 30㎛, in this case, it is preferable that the first partition wall is formed at least 6 to 27㎛ above the lower surface of the second front dielectric layer. .

Further, it is preferable that the width of the upper surface of the second front dielectric layer is 50 to 300 μm or less, and the width of the second front dielectric layer decreases toward the lower side.

Here, it is preferable that the first front dielectric layer and the second front dielectric layer are integrally formed.

On the other hand, the second partition wall is preferably formed to intersect the address electrode, the common electrode and the scan electrode has a transparent electrode and a bus electrode for compensating the line resistance of the transparent electrode, respectively, the transparent electrode It is preferable to protrude into the discharge cell and have a T shape.

On the other hand, the first partition and the second partition wall may be formed so that the discharge cells have a rectangular shape, on the other hand, the first partition and the second partition wall may be formed so that the discharge cells have a hexagonal shape.

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

Referring to FIG. 5, the plasma display panel 200 according to the present invention includes a front substrate 222, sustain electrode pairs 223 that are a common electrode 224, and a scan electrode 225, and a first front dielectric layer ( 226, a second front dielectric layer 266, a rear substrate 232, an address electrode 235, a rear dielectric layer 236, a phosphor 238, and a partition wall 240. The plasma display panel 200 according to the present exemplary embodiment includes a protective film 228, but the present invention is not limited thereto and may not include the protective film 228.

A plurality of address electrodes 235 having a predetermined pattern, for example, a stripe type or a serpentine pattern, and generating an address discharge are disposed on one side of the rear substrate 232, which is a glass substrate. The address electrode 235 is buried by the rear dielectric layer 236. On the rear dielectric layer 236, a partition wall 240 is disposed to prevent crosstalk of charged particles and partition the discharge cells. The partition wall includes a first partition wall 241 and a second partition wall 242 connected to the first partition wall 241 to partition a discharge cell. In this case, the height of the second partition 242 is lower than that of the first partition 241. Phosphor 238 is applied to the side surface of the partition wall 240 and the upper surface of the rear dielectric layer 236 that does not correspond to the partition wall 240.

Here, in FIG. 5, the second front dielectric layer 266 is formed in parallel with the sustain electrode pairs 223, the first partition wall 241 is formed along the address electrode 235, and the second partition wall 242 is the address. The second front dielectric layer 266 may be formed to intersect the sustain electrode pairs 223, but is not limited thereto.

The lower surface of the front substrate 222 disposed to face the rear substrate has a certain pattern, for example, a stripe type, a serpentine type, a T-shaped uneven portion formed, a shape separated from each other. A plurality of sustain electrode pairs 223 disposed to form a sustain discharge are formed. The sustain electrode pair 223 includes a common electrode 224 and a scan electrode 225. In this case, as shown in FIG. 5, the common electrode 224 and the bus electrode 225 are formed of the front substrate. The transparent electrodes 224a and 225a formed on the lower surface and the bus electrodes 224b and 225b formed on the lower surface of the transparent electrode to reduce the voltage drop due to the resistance of the transparent electrode during discharge may be provided. Unlike FIG. 5, the bus electrode 224 and the scan electrode 225 may be composed of only the transparent electrodes 224a and 225a or may be composed of only the bus electrodes 224b and 225b.

The sustain electrode pair 223 is buried by the first front dielectric layer 226. A plurality of second front side dielectric layers 266 having a predetermined pattern is formed on the bottom surface of the first front side dielectric layer 226. These second front dielectric layers 266 are formed in the non-discharge portion between adjacent discharge cells.

As shown in FIG. 6, when the direction in which the address electrode lines are formed, that is, the X direction is referred to as the vertical direction, and the direction perpendicular to the address electrode line, that is, the Y direction as the left and right directions, the partition walls are formed in the up and down directions. The first partition 241 and the second partition 242 formed in the left and right directions are provided to enclose each discharge cell. In this case, the first partition wall 241 is formed to intersect the second front dielectric layer 266.

FIG. 7 is a cross-sectional view taken along the line VII-VII of the plasma display panel of FIG. 6. As shown in FIG. 7, the second partition wall 242 has a constant height L2 such that an upper surface thereof contacts the lower surface of the second front dielectric layer 266, and is formed along the second front dielectric layer 266. do. Therefore, the second partition 242 does not generate a gap with the front substrate, and thus, the charged particles do not crosstalk to adjacent discharge cells on the boundary of the second partition 242. Here, the second front dielectric layer 266 is also formed to have a constant height (H).

8 and 9 are cross-sectional views taken along the X-ray and X-ray of the plasma display panel of FIG. 8 and 9, unlike the second partition 242, the first partition 241 has a constant gap G with the first front dielectric layer 226, and the second front dielectric layer 266 It has a height (L1) is inserted into a constant height (H1). In this case, the height L1 of the first partition wall is higher than the height L2 of the second partition wall.

Therefore, the first partition 241 is formed to have a clearance G less than a predetermined distance from the front substrate, so that the exhaust is made smoothly and crosstalk of charged particles is prevented, and the second partition 242 is front By being in contact with the substrate, the charged particles are prevented from crosstalk around the second partition 242.

In addition, as shown in FIG. 5, it is preferable that a recess is formed such that the height of the portion of the first partition 241 that crosses the second front dielectric layer 266 is equal to the height L2 of the second partition. However, due to this, as shown in FIG. 8, the second front dielectric layer 266 is partially inserted into the first partition wall 241.

The height H of the second front dielectric layer 266 is preferably formed to be 30 μm or less. This is because, when the height H of the second front dielectric layer 266 is 30 µm or more, the capacitance increases, which is disadvantageous for discharge.

In this case, it is preferable that the first partition wall 241 is formed 6 to 27 μm above the lower surface of the second front dielectric layer 266. As shown in the graph of FIG. 10, as the gap H1 between the upper surface of the first partition wall 241 and the lower surface of the second front dielectric layer 266 becomes larger, the misdischarge becomes smaller and smaller. This is because the probability of mis-discharge rapidly decreases when H1) is close to 6 µm, and the value becomes zero when the thickness becomes 6 µm or more. It is also because exhaust may be disadvantageous if it exceeds 30 mu m. In addition, as much phosphor is applied to the side of the first partition wall 241 as the area where the second front dielectric layer 266 is inserted into the first partition wall 241, the generation of visible light may be increased.

In addition, the width D of the upper surface of the second front dielectric layer 266 is preferably 300 μm or less, which prevents the second front dielectric layers 266 from being disposed in the discharge cell, thereby penetrating the front substrate in the discharge cell. This is to increase the amount of visible light, so that the brightness is maintained at a high level.

Here, the second front dielectric layer 266 preferably has a shape in which the width thereof decreases toward the lower side. In the sealing process of the front substrate 222 and the rear substrate 232, the second front dielectric layer 266 is formed on the first partition wall 241. 2 is to allow the front dielectric layer 266 to be inserted smoothly. In this case, the second front dielectric layer 266 may have a semicircular shape or an ellipse shape, or may have an inverted trapezoidal shape.

In addition, the first front dielectric layer 226 and the second front dielectric layer 266 are preferably formed integrally with the same material, thereby forming the first front dielectric layer 226 and the second front dielectric layer 266 separately. By eliminating the process, the work process can be simplified and the product price can be prevented from rising.

The second partition 266 may be formed to intersect the address electrodes 235. That is, the first partition 241 does not cross the address electrode 235, but is a vertical partition that intersects the sustain electrode pairs 223, and the second partition 242 intersects the address electrode 235 and maintains the first partition 241. It is preferably a horizontal partition wall formed along the electrode pairs 223.

This vertical partition partitions the discharge cells on the left and right, based on this, the main function to prevent the mixing of the discharge cells of the left and right, respectively, the phosphor color is different, and the horizontal partition partitions between the upper and lower discharge cells, The main function of preventing mis-discharge between the upper and lower discharge cells, and in order to prevent mis-discharge, the second partition 242 and the second front dielectric layer 266, which are horizontal partitions, are in contact with each other. This is because it is preferable that no gap is generated between the two front dielectric layers 266.

In this case, as shown in FIG. 11, the common transparent electrode 224a and the scan transparent electrode 225a each have a T shape protruding from the common bus electrode 224b and the scan bus electrode 225b into the discharge cell. It is preferable to make a shape. Due to this structure, the electric field inside the discharge cell is formed away from the first partition wall 241, and the common transparent electrode 224a and the scan transparent electrode 225a are concentrated in the center of the discharge cell. This is to prevent the charged particles from crosstalk through the gap between the 241 and the first front dielectric layer 226. In this case, the transparent electrodes 224a and 225a may have a T-shape in which the center portions 224a "and 225a" of the discharge cells are smaller in width than the periphery portions 224a 'and 225a' of the discharge cells. 224a "and 225a" may be T-types wider than the discharge cell circumferences 224a 'and 225a'.

Meanwhile, the first partition 241 and the second partition 242 may be formed such that the discharge cells have a rectangular shape as shown in FIG. 5. Unlike this, as shown in FIG. 12, the first partition 241 and the second partition 242 may be formed such that the discharge cells have a hexagonal shape.

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

First, by adopting a barrier rib having a lattice structure, it is possible to prevent crosstalk and mis-discharge between adjacent discharge cells.

Second, it is possible to secure the exhaust path to improve the exhaust capacity, and shorten the exhaust time.

Although the present invention has been described with reference to the embodiments illustrated 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 (11)

Front substrate; A plurality of sustain electrode pairs as scan and common electrodes which are formed in pairs for each unit discharge cell in a predetermined pattern on the bottom surface of the front substrate; A first front side dielectric layer filling the sustain electrode pairs; And A plurality of second front dielectric layers formed in a predetermined pattern between adjacent discharge cells on a lower surface of the first front dielectric layer; A rear substrate coupled to be spaced apart from the front substrate; A plurality of address electrodes formed on a top surface of the rear substrate to intersect the pair of sustain electrodes and formed in a predetermined pattern; A backside dielectric layer filling the address electrode; A first partition wall having a constant clearance with the first front dielectric layer, and a second partition wall having a top surface in contact with a bottom surface of the second front dielectric layer and having a lower height than the first partition wall and connected to the first partition wall Barrier ribs formed on an upper surface of the rear dielectric layer; And And a phosphor coated in the discharge cell. The method of claim 1, And a portion of the first partition wall corresponding to the second front dielectric layer is concave so that its height is the same as that of the second partition wall. The method of claim 2, The height of the second front dielectric layer is 10 to 30㎛ plasma display panel, characterized in that. The method of claim 3, wherein And an upper surface of the first partition wall is formed 6 to 27 μm above the lower surface of the second front dielectric layer. The method of claim 4, wherein And a width of the upper surface of the second front dielectric layer is 50 to 300 µm. The method of claim 5, wherein And the width of the second front side dielectric layer decreases toward the lower side of the plasma display panel. The method of claim 1, And the first front dielectric layer and the second front dielectric layer are integrally formed. The method according to any one of claims 1 to 7, And the second partition wall is formed to intersect with the address electrode. The method according to any one of claims 1 to 7, The common electrode and the scan electrode each include a transparent electrode, wherein the transparent electrode is protruded in a T-shape into each of the discharge cells. The method of claim 1, And the first and second barrier walls are formed such that discharge cells have a rectangular shape. The method of claim 1, And the first and second barrier walls are formed such that discharge cells have a hexagonal shape.

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