KR20090071866A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve the picture quality of image by forming a uniformly thickness of the fluorescent material layer in the available area. The scan electrode and sustain electrode are arranged in the front substrate. The address electrode is arranged in the rear substrate. The active area includes the second discharge cell(420) in the dummy region, the first discharge cell(410). The size of the second discharge cell is larger than the first discharge cell. The width(w2) of the second discharge cell is greater than the width(w1) of the first discharge cell. The barrier rib(440) is arranged in the second discharge cell. The barrier rib(430) is arranged in the first discharge cell.

Description

Plasma Display Panel

The present invention relates to a plasma display panel.

In the plasma display panel, a phosphor layer is formed in a discharge cell divided by a partition, and a plurality of electrodes are formed.

When the drive signal is supplied to the electrode of the plasma display panel, the discharge is generated by the drive signal supplied in the discharge cell. Here, when discharged by a drive signal in the discharge cell, the discharge gas filled in the discharge cell generates vacuum ultraviolet rays, and the vacuum ultraviolet light emits the phosphor formed in the discharge cell to emit visible light. Generate. The visible light displays an image on the screen of the plasma display panel.

One embodiment of the present invention is to provide a plasma display panel having a uniform thickness of a phosphor layer in an effective region by increasing a width of a discharge cell disposed in a dummy region.

According to an embodiment of the present invention, a plasma display panel includes a front substrate, a rear substrate disposed to face the front substrate, a partition partitioning a discharge cell between the front substrate and the rear substrate, and green, red, and blue phosphors disposed in the discharge cells. A discharge cell comprising a first discharge cell and a second discharge cell adjacent to each other in a direction in which the same phosphor layer is formed, the size of the second discharge cell being larger than the size of the first discharge cell, The discharge cell is disposed outside the first discharge cell.

In addition, the first discharge cell may be disposed in the effective area, and the second discharge cell may be disposed in the dummy area outside the effective area.

In addition, a scan electrode and a sustain electrode formed to be parallel to each other are disposed on the front substrate, and the length of the second discharge cell may be longer than the length of the first discharge cell in a direction parallel to at least one of the scan electrode and the sustain electrode.

Also, a scan electrode and a sustain electrode which are formed in parallel with each other are disposed on the front substrate, and an interval between any two second discharge cells in a direction parallel to at least one of the scan electrode and the sustain electrode may be any two first discharge cells. Smaller than the interval between

In addition, the second discharge cell may be disposed in the long side portion of the dummy region.

In addition, a plasma display panel according to another embodiment of the present invention includes a front substrate on which scan electrodes and a sustain electrode are arranged in parallel with each other, a rear substrate on which an address electrode intersecting the scan electrode and the sustain electrode is disposed, and a front substrate and a rear substrate. And a green, red and blue phosphor layer disposed in the discharge cell, the first discharge cell being disposed in the active area, and the effective area in a direction parallel to the scan electrode and the sustain electrode. The second discharge cell is disposed in the first dummy area disposed outside, and the third dummy area is disposed in the second dummy area disposed outside the effective area in the direction crossing the scan electrode and the sustain electrode. Discharge cells are arranged, and the same phosphor layer is arranged in the first, second and third discharge cells, the size of the first discharge cell and the size of the second discharge cell. It is the same, and the size of the third discharge cell is larger than the size of the first discharge cell and a second discharge cell.

In addition, the length of the third discharge cell in a direction parallel to at least one of the scan electrode and the sustain electrode may be longer than the length of the first discharge cell and the second discharge cell.

In addition, an interval between any two third discharge cells in a direction parallel to at least one of the scan electrode and the sustain electrode may be smaller than an interval between any two first and second discharge cells.

In the plasma display panel according to the exemplary embodiment of the present invention, the width of the discharge cells disposed in the dummy region is greater than the width of the discharge cells disposed in the effective region, so that the thickness of the phosphor layer is uniform in the effective region. Therefore, the image quality of the image is improved.

Hereinafter, a plasma display panel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining the structure of a plasma display panel according to an embodiment of the present invention.

Referring to FIG. 1, the plasma display panel 100 according to an embodiment of the present invention includes a front substrate 101 on which scan electrodes 102 and Y and sustain electrodes 103 and Z which are parallel to each other are disposed, and a front substrate ( It may include a rear substrate 111 disposed opposite to 101 and having an address electrode 113 intersecting with the scan electrode 102 and the sustain electrode 103.

An upper dielectric layer 104 may be disposed on the scan electrode 102 and the sustain electrode 103 to insulate the scan electrode 102 and the sustain electrode 103.

A protective layer 105 may be disposed over the upper dielectric layer 104 to facilitate discharge conditions. The protective layer 105 may include a material having a high secondary electron emission coefficient, such as magnesium oxide (MgO).

In addition, an address electrode 113 may be disposed on the rear substrate 111, and a lower dielectric layer 115 may be disposed on the address electrode 113 to insulate the address electrode 113.

In the upper portion of the lower dielectric layer 115, a discharge space, that is, a partition 112 partitioning the discharge cell may be disposed. The barrier rib 112 may be provided with a red (R), green (G), and blue (B) discharge cell between the front substrate 101 and the rear substrate 111. In addition, in addition to the red (R), green (G), and blue (B) discharge cells, white (W) or yellow (Yellow: Y) discharge cells may be further provided.

In the discharge cell partitioned by the partition wall 112, a discharge gas such as xenon (Xe), neon (Ne), or the like may be filled.

In addition, a phosphor layer 114 that emits visible light for image display may be disposed in the discharge cell partitioned by the partition wall 112. For example, a first phosphor layer emitting red (R) light, a second phosphor layer emitting blue (B) light, and a third phosphor layer emitting green (G) light are disposed. Can be. In addition to the red (R), green (G), and blue (B) light, it is also possible to further arrange other phosphor layers emitting white (W) light or yellow (Yellow: Y) light.

In addition, the thickness of the phosphor layer 114 in at least one of the red (R), green (G), and blue (B) discharge cells may be different from other discharge cells. For example, a phosphor layer of a green (G) discharge cell, that is, a phosphor layer in a third phosphor layer or a blue (B) discharge cell, that is, a thickness of a second phosphor layer in a red (R) discharge cell, Ie thicker than the thickness of the first phosphor layer. Here, the thickness of the third phosphor layer may be substantially the same or different from the thickness of the second phosphor layer.

In addition, the widths of the red (R), green (G), and blue (B) discharge cells may be substantially the same, but at least one of the red (R), green (G), and blue (B) discharge cells may have a width. It is also possible to differ from the width of other discharge cells. For example, the width of the red (R) discharge cell is the smallest, and the width of the green (G) and blue (B) discharge cells can be made larger than the width of the red (R) discharge cell. Here, the width of the green (G) discharge cell may be substantially the same as or different from the width of the blue (B) discharge cell. Then, color temperature characteristics of the image to be implemented may be improved.

In addition, in FIG. 1, only the case where the partition wall 112 is formed on the rear substrate 111 is illustrated, but the partition wall 112 may be disposed on at least one of the front substrate 101 and the rear substrate 111.

In addition, the above description shows only the case where the lower dielectric layer 115 and the upper dielectric layer 104 is one layer, but at least one of the lower dielectric layer 115 or the upper dielectric layer 104 is a plurality of layers. It is also possible to form a layer of.

In addition, although the width and thickness of the address electrode 113 disposed on the rear substrate 111 may be substantially constant, the width or thickness inside the discharge cell may be different from the width or thickness outside the discharge cell. For example, the width or thickness inside the discharge cell may be wider or thicker than that outside the discharge cell.

2 is a view for explaining an example of the structure of the scan electrode and the sustain electrode.

Referring to FIG. 2, the scan electrode 102 and the sustain electrode 103 may each have a multi-layer structure. For example, the scan electrode 102 and the sustain electrode 103 may include the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b.

Here, the bus electrodes 102b and 103b include at least one of a substantially opaque material such as silver (Ag), gold (Au), and aluminum (Al), and the transparent electrodes 102a and 103a are substantially transparent. The material may include, for example, indium tin oxide (ITO) material.

In addition, when the scan electrode 102 and the sustain electrode 103 include the bus electrodes 102b and 103b and the transparent electrodes 102a and 103a, the reflection of external light by the bus electrodes 102b and 103b is prevented. The black layers 120 and 130 may be further included between the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b.

On the other hand, the transparent electrodes 102a and 103a may be omitted from the scan electrode 102 and the sustain electrode 103. That is, the scan electrode 102 and the sustain electrode 103 can also be ITO-Less electrodes in which the transparent electrodes 102a and 103a are omitted.

3 is a diagram for explaining an effective area and a dummy area.

Referring to FIG. 3, the plasma display panel may include an active area 300 in which an image is displayed and a dummy area 310 which does not contribute to the image display. Here, the effective area 300 is an area in which a predetermined visible light is generated when the image is displayed while driving, and the structure thereof is as described in detail with reference to FIG. 1.

The dummy area 310 may be disposed outside the effective area 300. The dummy region 310 may be formed to ensure structural stability of the effective region 300 or to secure driving stability in the effective region.

4 and 5 are diagrams for describing the first discharge cell and the second discharge cell of the plasma display panel according to an embodiment of the present invention.

First, referring to FIG. 4, the portion A of FIG. 3 is enlarged to illustrate the first discharge cell 410 and the second discharge cell 420.

The effective area may include the first discharge cell 410, and the dummy area may include the second discharge cell 420.

Here, the size of the second discharge cell 420 disposed in the dummy region is larger than that of the first discharge cell 410 disposed in the effective region.

In addition, the width w2 of the second discharge cell 420 may be greater than the width w1 of the first discharge cell 410.

Also, as the width w2 of the second discharge cell 420 becomes larger than the width w1 of the first discharge cell 410, the interval g2 between the second discharge cells is equal to the interval g1 between the first discharge cells. Can be smaller than In other words, the width of the partition wall 440 disposed between the second discharge cells 420 may be smaller than the width of the partition wall 430 disposed between the first discharge cells 410.

As such, the reason for making the second discharge cell 420 larger than the first discharge cell 410 is that, in the process of applying the phosphor, there is not enough free space for the phosphor to be uniformly applied before the phosphor is applied to the effective region. In the effective area, cells in which phosphors are not applied may occur, or the amount of phosphors applied to each cell may not be uniform.

Therefore, it is necessary to secure enough space to make the coating amount of the phosphor uniform in the effective region.

Accordingly, since the width of the second discharge cell is wider than the width of the first discharge cell, a sufficient amount of phosphor is applied in the dummy region, and then the phosphor may be applied to the effective region, so that the application of the phosphor is uniform. Can be.

The coating process of the phosphor will be described in more detail with reference to FIGS. 6A and 6B.

Next, referring to FIG. 5, part B of FIG. 3 is enlarged to illustrate a discharge cell disposed at a short side portion of a dummy region.

The discharge cell 510 disposed at the short side portion of the dummy region may not be the second discharge cell 420 disposed at the long side portion of the dummy region described with reference to FIG. 4. In other words, the horizontal width w3 of the discharge cell 510 disposed in the short side portion of the dummy region may not be as large as the width w2 of the second discharge cell 420 disposed in the long side portion.

Because the application of the phosphor proceeds in the short side direction of the panel, a space for sufficient application of the phosphor may not be required at the short side of the dummy region. Therefore, it is not necessary that the width w3 of the discharge cells 510 disposed be larger than the width w1 of the first discharge cells 410 in the effective region.

Therefore, the size of the discharge cell 510 disposed in the short side portion of the dummy region may be the same as the size of the first discharge cell 410 disposed in the effective region.

6A to 6B are views for explaining a coating method of the phosphor.

First, referring to FIG. 6A, an example of a phosphor coating method is illustrated.

The phosphor layer may be formed through a dispensing method. For example, the dispensing apparatus 600 dispenses phosphor material in a paste or slurry state into a discharge cell 620 partitioned by a partition wall through a nozzle 610, and then, The phosphor layer may be formed through a drying or firing process.

Meanwhile, in the process of applying the phosphor material in the paste state or the slurry state as described above, the amount of the phosphor material dispensed from the nozzle 510 may become uneven. As a result, the thickness of the phosphor layer dispensed into the effective region may be non-uniform.

Looking at the application process of such a phosphor in detail as shown in Figure 6b.

A seal layer (not shown) for bonding the front substrate (not shown) and the back substrate 660 is disposed, and a seal barrier rib (SBR) 630 to prevent the seal layer from flowing into the discharge cell. ) May be arranged.

In the phosphor coating process, the protective tape 640 is attached to the upper portion of the SBR 630 so that the phosphor does not adhere to the SBR 630.

The application process of the phosphor is that the nozzle 610 passes over the point P1 where the SBR 630 and the protection tape 640 are disposed, the point P2 without the SBR 630 and only the protection tape 640, and the protection tape 640. 2), the dummy region and the effective region in which the image is displayed are passed through the P3 point without the dot and the P4 point where the partition wall 650 partitioning the discharge cells in the dummy area is disposed.

In this process, since both the SBR 630 and the protective tape 640 are formed in the P1 point, the gap d1 between the P1 point and the nozzle 610 becomes very short, so that the phosphor material discharged from the nozzle 610 is sufficiently formed. You will not come out. Next, at the point P2 and the point P3, the SBR 630 and the protection tape 640 disappear in turn, and as the gaps d2 and d3 between the nozzle and the point P2 and P3 widen sharply, the phosphor material was not discharged from the point P1. Emissions can increase dramatically.

In addition, a phenomenon in which the discharge of the phosphor material may not be uniformly repeated since the dummy barrier rib 650 is reached at the point P4 is formed.

As described above, since the coating amount of the phosphor may not be uniform, a spatial margin is required to stabilize the coating amount of the phosphor to be uniform.

Accordingly, as described with reference to FIG. 4, the width of the second discharge cell is wider than the width of the first discharge cell so that the phosphor is sufficiently applied in the dummy region, and then the phosphor is effectively applied to the effective region.

7A to 7B are views for explaining another embodiment of the second discharge cell.

In the second discharge cells arranged in the dummy region, two or more adjacent discharge cells may be merged with each other.

First, as illustrated in FIG. 7A, in the second discharge cells 710 disposed in the dummy region, two discharge cells adjacent to each other in the vertical direction may be merged.

Next, as shown in FIG. 7B, the second discharge cells 720 may merge two discharge cells adjacent to each other in the horizontal direction.

As such, when the discharge cells in the dummy region are merged, more space for the application of the phosphor in the dummy region may be secured.

Accordingly, after applying a sufficient amount of phosphor in the dummy region, since the phosphor can be applied to the effective region, the application of the phosphor can be made more uniform.

7A to 7B show that two second discharge cells adjacent to each other are merged, but three or more discharge cells may be merged.

Here, as the discharge cells are merged, phosphors of different colors may be mixed in the merged discharge cell, but since the second discharge cells 710 and 720 disposed in the dummy area are discharge cells in which images are not displayed, Even if phosphors of different colors are mixed, there is no problem in the image displayed in the effective area.

As such, the discharge cells disposed in the dummy region may be changed in various forms to secure sufficient space so that the phosphors may be uniformly applied in the effective region.

8 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention. 8 illustrates an example of a method of operating a plasma display panel according to an embodiment of the present invention, and the present invention is not limited to FIG. 8.

Referring to FIG. 8, a reset signal may be supplied to a scan electrode in a reset period for initialization. The reset signal may include a ramp-up signal and a ramp-down signal.

For example, in the set-up period, a rising ramp signal may be supplied to the scan electrode to gradually increase the voltage. Then, in the setup period, a weak dark discharge, that is, setup discharge, occurs in the discharge cell by the rising ramp signal. By this setup discharge, some wall charges can be accumulated in the discharge cells.

In the set-down period after the setup period, the rising ramp signal may be supplied to the scan electrode after the rising ramp signal in the opposite polarity direction. Then, a weak erase discharge, that is, a set down discharge, occurs in the discharge cell. By this set-down discharge, wall charges such that address discharge can be stably generated in the discharge cells remain uniformly.

In the address period after the reset period, a scan bias signal that substantially maintains a voltage higher than the lowest voltage of the falling ramp signal, for example, the sixth voltage V6, is supplied to the scan electrode.

In addition, a scan signal falling from the scan bias signal may be supplied to the scan electrode.

Meanwhile, the pulse width of the scan signal Scan supplied to the scan electrode in the address period of at least one subfield may be different from the pulse width of the scan signal of another subfield. For example, the width of the scan signal in the subfield located later in time may be smaller than the width of the scan signal in the preceding subfield. In addition, the reduction of the scan signal width according to the arrangement order of the subfields may be made gradually, such as 2.6 Hz, 2.3 Hz, 2.1 Hz, 1.9 Hz, or 2.6 Hz, 2.3 Hz, 2.3 Hz, 2.1 Hz ... It may also be made as follows.

As such, when the scan signal is supplied to the scan electrode, the data signal may be supplied to the address electrode corresponding to the scan signal.

When the scan signal and the data signal are supplied, an address discharge may be generated in the discharge cell to which the data signal is supplied while the voltage difference between the scan signal and the data signal and the wall voltage generated by the wall charges generated in the reset period are added. .

Here, the sustain bias signal may be supplied to the sustain electrode in order to prevent the address discharge from becoming unstable due to the interference of the sustain electrode in the address period.

The sustain bias signal can keep the sustain bias voltage Vz smaller than the voltage of the sustain signal supplied in the sustain period and larger than the voltage of the ground level GND.

Subsequently, in the sustain period for displaying an image, a sustain signal may be supplied to at least one of the scan electrode and the sustain electrode. For example, a sustain signal may be alternately supplied to the scan electrode and the sustain electrode.

When such a sustain signal is supplied, the discharge cell selected by the address discharge is added with the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal, and a sustain discharge, i.e., display between the scan electrode and the sustain electrode when the sustain signal is supplied. Discharge may occur.

Meanwhile, in the at least one subfield, a plurality of sustain signals are supplied in the sustain period, and the pulse width of at least one sustain signal of the plurality of sustain signals may be different from the pulse widths of other sustain signals. For example, the pulse width of the sustain signal that is supplied first of the plurality of sustain signals may be larger than the pulse width of other sustain signals. Then, the sustain discharge can be more stabilized.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

1 is a view for explaining the structure of a plasma display panel according to an embodiment of the present invention.

2 is a diagram for explaining an example of the structure of a scan electrode and a sustain electrode.

3 is a diagram for explaining an effective area and a dummy area.

4 and 5 are views for explaining the first discharge cell and the second discharge cell of the plasma display panel according to an embodiment of the present invention.

6A to 6B are views for explaining a coating method of a phosphor.

7A to 7B are views for explaining another embodiment of the second discharge cell.

8 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention;

Claims (8)

Front substrate; A rear substrate disposed to face the front substrate; A partition wall partitioning a discharge cell between the front substrate and the rear substrate; And Green, red and blue phosphor layers disposed in the discharge cells; Including, The discharge cell includes a first discharge cell and a second discharge cell adjacent to each other in the direction in which the same phosphor layer is formed, The size of the second discharge cell is larger than the size of the first discharge cell, And the second discharge cell is disposed outside the first discharge cell. The method of claim 1, The first discharge cell is disposed in the effective area, And the second discharge cell is disposed in a dummy area outside the effective area. The method of claim 1, Scan electrodes and sustain electrodes are formed on the front substrate to be parallel to each other. And a length of the second discharge cell longer than a length of the first discharge cell in a direction parallel to at least one of the scan electrode and the sustain electrode. The method of claim 1, Scan electrodes and sustain electrodes are formed on the front substrate to be parallel to each other. And a spacing between any two second discharge cells in a direction parallel to at least one of the scan electrode and the sustain electrode is smaller than a spacing between any two first discharge cells. The method of claim 1, And the second discharge cell is disposed at a long side of the dummy region. A front substrate on which scan electrodes and sustain electrodes parallel to each other are disposed; A rear substrate having an address electrode intersecting the scan electrode and the sustain electrode; Barrier ribs defining a discharge cell between the front substrate and the rear substrate; And Green, red and blue phosphor layers disposed in the discharge cells; Including, The first discharge cell is arranged in the active area, A second discharge cell is disposed in a first dummy area disposed outside the effective area in a direction parallel to the scan electrode and the sustain electrode; A third discharge cell is disposed in a second dummy area disposed outside the effective area in a direction crossing the scan electrode and the sustain electrode; The same phosphor layer is disposed in the first, second, and third discharge cells, The size of the first discharge cell and the size of the second discharge cell is the same, and the size of the third discharge cell is larger than the size of the first discharge cell and the second discharge cell. The method of claim 6, And a length of the third discharge cell longer than a length of the first discharge cell and the second discharge cell in a direction parallel to at least one of the scan electrode and the sustain electrode. The method of claim 6, And a spacing between any two of the third discharge cells in a direction parallel to at least one of the scan electrode and the sustain electrode is smaller than a spacing between any two of the first and second discharge cells.

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