KR100872363B1 - Plasma Display Panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, wherein the discharge path is prevented from occurring in the dummy area by different paths of the dummy discharge cells formed in the dummy area and the paths of the effective discharge cells formed in the effective area. Accordingly, there is an effect of preventing the deterioration of the contrast characteristic and preventing the deterioration of the image quality of the implemented image.

Such a plasma display panel according to an embodiment of the present invention includes a front substrate on which first and second electrodes are parallel to each other, and a rear substrate disposed opposite to the front substrate and an image between the front substrate and the rear substrate. In the displayed active area, the effective discharge cell is partitioned, and in the dummy area disposed outside the effective area, a partition wall partitioning the dummy discharge cell different from the effective discharge cell and the traveling path is included. The first electrode and the second electrode which are different electrodes are respectively disposed in the discharge cell, and the first electrode and the first electrode or the second electrode and the second electrode which are the same electrode are disposed in the dummy discharge cell, respectively. .

Description

Plasma Display Panel

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

2 is a view for explaining an example in the case where at least one of the first electrode or the second electrode is a plurality of layers;

3 is a view for explaining an example where at least one of the first electrode and the second electrode is a single layer;

4 is a diagram for explaining a dummy region and an effective region.

5 is a diagram for explaining discharge cells in an effective region and a dummy region.

6A to 6B are views for explaining arrangement of electrodes in an effective discharge cell and a dummy discharge cell.

7 is a diagram for explaining discharge start voltages in an effective region and a dummy region.

8 is a diagram for explaining another example of the discharge cells in the effective area and the dummy area.

9A to 9B are views for explaining still another example of the discharge cells in the effective region and the dummy region.

10 is a diagram for explaining a black layer formed at a position corresponding to the dummy region.

FIG. 11 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display panel according to an embodiment of the present invention. FIG.

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

13A to 13B are views for explaining another form of the rising ramp signal or the second falling ramp signal.

14 is a diagram for explaining another type of a sustain signal.

<Description of the numbers for the main parts of the drawings>

101: front substrate 102: first electrode

103: second electrode 104: upper dielectric layer

105: protective layer 111: back substrate

112, 112a, 112b: partition 113: third electrode

114: phosphor layer 115: lower dielectric layer

The present invention relates to a plasma display panel.

In general, a phosphor layer is formed in a discharge cell (Cell) partitioned by a partition, and a plurality of electrodes are formed in the plasma display panel.

The driving signal is supplied to the discharge cell through the electrode.

Then, 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.

On the other hand, the conventional plasma display panel has a problem that the discharge occurs in the dummy area (Dummy Area). Accordingly, the light generated by the discharge generated in the dummy region is emitted to the outside, thereby deteriorating contrast characteristics and deteriorating image quality of the image to be implemented.

One object of the present invention to solve the above problems is to provide a plasma display panel that improves the arrangement of the discharge cells in the dummy region to suppress the generation of discharge in the dummy region.

Plasma display panel according to an embodiment of the present invention for achieving the above object is a front substrate formed with the first electrode and the second electrode parallel to each other, the rear substrate and the front substrate and the rear substrate disposed to be opposed to the front substrate In the active area in which the image between the display area is divided, the effective discharge cell is partitioned, and in the dummy area disposed outside the effective area, a partition wall partitioning the dummy discharge cell having a different path from the effective discharge cell is used. And a first electrode and a second electrode, which are different electrodes, are disposed in the effective discharge cell, respectively, and a first electrode and a first electrode or a second electrode, and a second electrode, which are the same electrode, are disposed in the dummy discharge cell, respectively. It is characterized by.

In addition, the size of at least one of the effective discharge cells and the size of at least one of the dummy discharge cells may be substantially the same.

In addition, a black layer may be further formed at a position corresponding to the dummy region on the front substrate.

In addition, the traveling path of the effective discharge cell and the traveling path of the dummy discharge cell may be parallel to each other.

In addition, another plasma display panel according to an embodiment of the present invention for achieving the above object is a front substrate formed with a first electrode and a second electrode parallel to each other, a rear substrate and a front substrate disposed to face the front substrate An effective partition wall defining an effective discharge cell in an active area in which an image between the substrate and the rear substrate is displayed; and an area between a first electrode and a second electrode in a dummy area disposed outside the effective area. A barrier rib including a dummy barrier rib covering a portion of the dummy barrier rib, wherein the dummy barrier rib partitions the dummy discharge cell, and the first discharge electrode and the second electrode are disposed in the effective discharge cell, and the dummy discharge cell is disposed in the dummy discharge cell. A first electrode and a first electrode or a second electrode and a second electrode, which are the same electrode, are disposed, respectively.

In addition, the width of the dummy partition wall may be 50 µm (micrometer) or more and 500 µm (micrometer) or less.

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 an example of the structure of a plasma display panel according to an embodiment of the present invention. In FIG. 1, an active area of a plasma display panel according to an exemplary embodiment of the present invention will be described, and a dummy area will be described in detail later.

Referring to FIG. 1, a plasma display panel according to an exemplary embodiment of the present invention may include a front substrate 101 on which first electrodes 102 and Y and second electrodes 103 and Z are parallel to each other, and the first substrate described above. The rear substrate 111 formed with the third electrodes 113 and X crossing the electrodes 102 and Y and the second electrodes 103 and Z may be bonded to each other.

The electrodes formed on the front substrate 101, for example, the first electrodes 102 and Y and the second electrodes 103 and Z, generate a discharge in a discharge space, that is, an effective discharge cell, and at the same time, Discharge can be maintained.

The dielectric layer covers the first electrode 102 and the second electrode 103 and Z on the front substrate 101 on which the first electrode 102 and the second electrode 103 and Z are formed. For example, upper dielectric layer 104 may be formed.

This upper dielectric layer 104 limits the discharge current of the first electrode 102, Y and the second electrode 103, Z and between the first electrode 102, Y and the second electrode 103, Z. Can be insulated.

A protective layer 105 may be formed on the upper surface of the upper dielectric layer 104 to facilitate a discharge condition. The protective layer 105 may be formed through a method of depositing a material such as magnesium oxide (MgO) on the upper dielectric layer 104.

Meanwhile, electrodes, for example, third electrodes 113 and X are formed on the rear substrate 111, and third electrodes 113 and X are formed on the rear substrate 111 on which the third electrodes 113 and X are formed. A dielectric layer, such as lower dielectric layer 115, may be formed to cover the gap.

The lower dielectric layer 115 may insulate the third electrodes 113 and X.

The upper portion of the lower dielectric layer 115 has a discharge space, that is, a partition wall 112 such as a stripe type, a well type, a delta type, a honeycomb type, etc. for partitioning an effective discharge cell. This can be formed. Accordingly, an effective discharge cell such as red (R), green (G), and blue (B) may be formed between the front substrate 101 and the rear substrate 111.

Further, in addition to the red (R), green (G), and blue (B) effective discharge cells, it is also possible to further form white (W) or yellow (Yellow: Y) effective discharge cells.

Meanwhile, although the pitches of the red (R), green (G), and blue (B) effective discharge cells in the plasma display panel according to an embodiment of the present invention may be substantially the same, red (R), The pitches of the red (R), green (G) and blue (B) effective discharge cells may be varied to match the color temperature in the green (G) and blue (B) effective discharge cells.

In this case, although the pitch may be different for each of the red (R), green (G), and blue (B) effective discharge cells, at least one effective discharge cell among the red (R), green (G), and blue (B) effective discharge cells may be used. The pitch of the cells may be different from that of other effective discharge cells. For example, the pitch of the red (R) effective discharge cells is the smallest, and the pitches of the green (G) and blue (B) effective discharge cells may be larger than the pitch of the red (R) effective discharge cells.

Here, the pitch of the green (G) effective discharge cells may be substantially the same as or different from the pitch of the blue (B) effective discharge cells.

In addition, the plasma display panel according to the exemplary embodiment of the present invention may have not only the structure of the partition wall 112 shown in FIG. 1 but also the structure of the partition wall having various shapes. For example, the partition wall 112 includes a first partition wall 112b and a second partition wall 112a, where the height of the first partition wall 112b and the height of the second partition wall 112a are different from each other. At least one of the first partition wall 112b or the second partition wall 112a, and a channel type partition wall structure having a channel usable as an exhaust passage, at least one of the first partition wall 112b and the second partition wall 112a. Grooved partition wall structure having a groove formed in the groove will be possible.

Here, in the case of the differential partition wall structure, the height of the first partition wall 112b among the first partition wall 112b or the second partition wall 112a may be lower than the height of the second partition wall 112a. In addition, in the case of a channel-type partition wall structure or a groove-type partition wall structure, a channel may be formed or a groove may be formed in the first partition wall 112b.

On the other hand, in the plasma display panel according to an embodiment of the present invention, although red (R), green (G), and blue (B) effective discharge cells are shown and described as being arranged on the same line, they are arranged in different shapes. It would also be possible. For example, a Delta type arrangement in which red (R), green (G) and blue (B) effective discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the effective discharge cell may be not only rectangular but also various polygonal shapes such as pentagon and hexagon.

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 formed on at least one of the front substrate 101 and the rear substrate 111.

Here, a predetermined discharge gas may be filled in the effective discharge cell partitioned by the partition wall 112.

In addition, a phosphor layer 114 for emitting visible light for image display may be formed in the effective discharge cell partitioned by the partition wall 112. For example, red (R), green (G), and blue (B) phosphor layers may be formed.

In addition to the red (R), green (G), and blue (B) phosphors, it is also possible to further form a white (W) and / or yellow (Y) phosphor layer.

In addition, the phosphor layers 114 of the red (R), green (G), and blue (B) effective discharge cells may have substantially the same thickness or may differ from one or more. For example, when the thickness of the phosphor layer 114 in at least one of the red (R), green (G), and blue (B) effective discharge cells is different from other effective discharge cells, green (G) ) Or the thickness of the phosphor layer 114 in the blue (B) effective discharge cell may be thicker than the thickness of the phosphor layer 114 in the red (R) effective discharge cell. Here, the thickness of the phosphor layer 114 in the green (G) effective discharge cell may be substantially the same as or different from the thickness of the phosphor layer 114 in the blue (B) effective discharge cell.

In the above description, only one example of the plasma display panel according to an exemplary embodiment of the present invention is illustrated and described. However, the present invention is not limited to the plasma display panel having the above-described structure. For example, the description hereinabove illustrates only the case where the top dielectric layer number 104 and the bottom dielectric layer number 115 are each one layer, but one or more of these top dielectric layers and bottom dielectric layers may be a plurality of layers. It can also be layered.

In addition, a black layer (not shown) may be further formed on the upper part of the partition wall 112 to prevent reflection of the external light due to the partition wall number 112.

In addition, a black layer (not shown) may be further formed at a specific position on the front substrate 101 corresponding to the partition wall 112.

In addition, the third electrode 113 formed on the rear substrate 111 may have substantially the same width or thickness, but the width or thickness inside the effective discharge cell is different from the width or thickness outside the effective discharge cell. Could be For example, the width or thickness inside the effective discharge cell may be wider or thicker than that outside the effective discharge cell.

As such, the structure of the plasma display panel according to the exemplary embodiment may be variously changed.

Next, FIG. 2 is a figure for demonstrating an example in the case where at least one of a 1st electrode or a 2nd electrode is a some layer.

Referring to FIG. 2, at least one of the first electrode 102 or the second electrode 103 may be formed of a plurality of layers, for example, two layers.

For example, considering light transmittance and electrical conductivity, at least one of the first electrode 102 and the second electrode 103 may be formed of silver in order to emit light generated in the effective discharge cell to the outside and to secure driving efficiency. Bus electrodes 102b and 103b including a substantially opaque material such as (Ag) and transparent electrodes 102a and 103a including a transparent material such as transparent indium tin oxide (ITO). have.

As such, when the first electrode 102 and the second electrode 103 include the transparent electrodes 102a and 103a, visible light generated in the effective discharge cell can be effectively emitted when emitted to the outside of the plasma display panel. have.

In addition, when the first electrode 102 and the second electrode 103 include the bus electrodes 102b and 103b, the first electrode 102 and the second electrode 103 include only the transparent electrodes 102a and 103a. In this case, the driving efficiency may decrease because the electrical conductivity of the transparent electrodes 102a and 103a is relatively low, and the low electrical conductivity of the transparent electrodes 102a and 103a that may cause such a reduction in driving efficiency may be compensated. Can be.

As described above, in the case where the first electrode 102 and the second electrode 103 include the bus electrodes 102b and 103b, the transparent electrodes 102a, in order to prevent reflection of external light by the bus electrodes 102b and 103b, may be used. Black layers 220 and 221 may be further provided between the 103a and the bus electrodes 102b and 103b.

Next, FIG. 3 is a figure for explaining an example in the case where at least one of a 1st electrode or a 2nd electrode is a single layer.

Referring to FIG. 3, the first electrodes 102 and Y and the second electrode 103 and Z are one layer. For example, the first electrodes 102 and Y and the second electrodes 103 and Z may be electrodes (ITO-Less) in which the transparent electrode of number 102a or 103a is omitted in FIG. 2.

At least one of the first electrode 102 and the second electrode 103 and the second electrode 103 and Z may include an electrically conductive metal material that is substantially opaque. For example, it may include a material having excellent electrical conductivity such as silver (Ag), copper (Cu), aluminum (Al), and the like, and a material having a lower cost than a transparent material such as indium tin oxide (ITO). .

In addition, at least one of the first electrode 102 (Y) or the second electrode 103 (Z) may be darker in color than the upper dielectric layer 104 of FIG. 1.

As such, when at least one of the first electrode 102 and the second electrode 103 and Z is a single layer, the manufacturing process is simpler than in the case of FIG. 2. For example, in the case of FIG. 2, the bus electrodes 102b and 103b are formed after the transparent electrodes 102a and 103a are formed in the process of forming the first electrodes 102 and Y and the second electrodes 103 and Z. 3 again, the first electrode 102 and Y and the second electrode 103 and Z can be formed in one step because the single layer structure of FIG.

In addition, as shown in FIG. 3, when the first electrodes 102 and Y and the second electrodes 103 and Z are formed in a single layer, the manufacturing process is simplified and relatively expensive indium-tin-oxide (ITO) or the like. Since it is not necessary to use a transparent material of the manufacturing cost can be reduced.

Meanwhile, the discoloration of the front substrate 101 is prevented between the first electrodes 102 and Y and the second electrodes 103 and Z and the front substrate 101, and the first electrodes 102 and Y or the second electrode ( Black layers 300a and 300b having a darker color than at least one of 103 and Z may be further provided. That is, when the front substrate 101 and the first electrode 102, Y or the second electrode 103, Z directly contact each other, the first substrate 102, Y or the second electrode 103, Z may be directly contacted. Migration phenomenon may occur in which a predetermined area of the front substrate 101 in contact with the yellow color is changed, and the black layers 300a and 300b may prevent the migration of the front substrate 101 by preventing the migration phenomenon. It can be.

The black layers 300a and 300b may include a black material having a substantially dark color, for example, ruthenium (Rb).

As such, when the black layers 300a and 300b are provided between the front substrate 101, the first electrodes 102 and Y, and the second electrodes 103 and Z, the first electrodes 102 and Y are separated from each other. Even if the second electrodes 103 and Z are made of a material having high reflectance, generation of reflected light can be prevented.

4 is a diagram for explaining the dummy region and the effective region.

Referring to FIG. 4, the plasma display panel may include an effective area 410 in which an image is displayed and a dummy area 400 that does not contribute to the image display. Here, the effective region is described in more detail with reference to FIGS. 1 to 3, and thus redundant descriptions thereof will be omitted.

The dummy area 400 may be disposed around the effective area 410. The dummy region 400 may be formed to ensure structural stability of the effective region 410 or to ensure operational stability in the effective region.

Next, FIG. 5 is a diagram for explaining the effective discharge cells in the effective area and the dummy area.

Referring to FIG. 5, the partition wall 500 partitions the effective discharge cells R, G, and B in the effective area 410 in which an image between the front substrate and the rear substrate is displayed. In the dummy region 400 disposed outside the effective region, the dummy discharge cells D having different travel paths from the effective discharge cells R, G, and B may be divided. In other words, the advance paths of the effective discharge cells R, G, and B and the dummy discharge cells D are different from each other. Alternatively, the traveling path of the effective discharge cell and the traveling path of the dummy discharge cell may be parallel to each other.

Here, the effective discharge cells are represented by red (R) effective discharge cells, green (G) effective discharge cells, and blue (B) effective discharge cells, and the rest are represented by dummy discharge cells (D).

In addition, the partition 500 which partitions the effective discharge cells R, G, and B can be called an effective partition, and the partition 500 which partitions the dummy discharge cell D can be called a dummy partition.

6A to 6B are diagrams for explaining the arrangement of electrodes in the effective discharge cell and the dummy discharge cell.

First, referring to FIG. 6A, as the traveling path of the dummy discharge cell 610 and the traveling path of the effective discharge cell 600 are different, the arrangement of electrodes in the dummy discharge cell 610 and the inside of the effective discharge cell 600 are different. The placement of the electrodes in can vary.

For example, in the effective discharge cell 600 as shown in FIG. 6A, the first electrodes Ya and Ya + 1 and the second electrodes Za and Za + 1 may be disposed together, respectively. For example, in one effective discharge cell 600, the Ya first electrode and the Za second electrode are disposed together. On the other hand, only one type of electrode may be disposed in the dummy discharge cell 610. For example, only the second electrodes Za and Za + 1 may be disposed in the dummy discharge cell 610.

Next, referring to FIG. 6B, as the traveling path of the dummy discharge cell 610 and the traveling path of the effective discharge cell 600 are different, the first electrode 620 in the dummy area disposed outside the effective area. A portion of the region between the second electrode 630 and the second electrode 630 may be covered.

For example, in the effective area, the first electrode 620 and the second electrode 630 may be disposed to face each other at a position corresponding to the space partitioned by the effective partition wall 640 as shown in (a).

On the other hand, in the dummy region, as shown in (b), a portion of the region between the first electrode 620 and the second electrode 630 may be disposed to cover the dummy partition wall 650. Here, the width W of the dummy partition wall 650 may be set to 50 μm (micrometer) or more and 500 μm (micrometer) or less.

Next, FIG. 7 is a diagram for explaining discharge start voltages in the effective area and the dummy area. Here, FIG. 7 shows in advance that the discharge start voltage at which discharge can occur between the first electrode and the second electrode is shown.

Referring to FIG. 7, in the effective region, when the voltage between the first electrode and the second electrode is about 225 V or more, discharge may occur between the first electrode and the second electrode. That is, the discharge starting voltage (Firing Voltage) is approximately 225V.

On the other hand, in the dummy region, only two identical electrodes are disposed in the dummy discharge cell as shown in FIG. 6A or the dummy partition wall covers a part of the region between the first electrode and the second electrode as shown in FIG. 6B (b). Therefore, when the voltage between the first electrode and the second electrode becomes approximately 400V or more, discharge may occur between the first electrode and the second electrode. That is, the discharge start voltage is approximately 400V. Accordingly, the possibility of discharge occurring during driving in the dummy region is very low.

Further, when the width W of the dummy partition wall 650 is set to 50 µm (micrometer) or more and 500 µm (micrometer) or less, the discharge start voltage between the first electrode and the second electrode in the dummy region is further increased. It is possible to raise, thereby further lowering the possibility of discharge occurring when driving in the dummy region.

Accordingly, by suppressing the discharge in the dummy region, it is possible to prevent the contrast characteristic from deteriorating and to prevent the image quality of the image to be implemented from being deteriorated.

8 is a diagram for explaining another example of the discharge cells in the effective area and the dummy area.

Referring to FIG. 8, in the above description, only the paths of the dummy discharge cells D in the dummy region are the same, but the paths of the at least one dummy discharge cell D are different from each other. It may be different from the progress path.

For example, as shown in FIG. 8, the traveling paths of the dummy discharge cells D may be different from each other.

9A to 9B are diagrams for explaining still another example of the discharge cells in the effective region and the dummy region.

First, referring to FIG. 9A, the size of the effective discharge cell 900 in the effective region and the size of the dummy discharge cell 910 in the dummy region may be different.

For example, assuming that the horizontal length of the effective discharge cell 900 is the first length d1 and the vertical length is the second length d2, the length of the dummy discharge cell 910 in the horizontal direction is assumed. May be a third length d3 shorter than the first length d1, or the length of the dummy discharge cell 910 in the longitudinal direction may be a fourth length d4 shorter than the second length d2.

As such, when the size of the dummy discharge cell 910 is smaller than the size of the effective discharge cell 900, the discharge start voltage between the first electrode and the second electrode in the dummy region may be further increased.

Next, referring to FIG. 9B, the length d1 of the effective discharge cell 920 in the effective area may be shorter than the length d3 of the dummy discharge cell 930 in the dummy area. Here, the length d2 in the vertical direction of the effective discharge cell 920 may be substantially the same as the length d4 in the vertical direction of the dummy discharge cell 930.

In this manner, the size of the dummy discharge cell 930 may be larger than that of the effective discharge cell 920.

Next, FIG. 10 is a diagram for describing a black layer formed at a position corresponding to the dummy region.

Referring to FIG. 10, a black layer 1050 may be further formed at a position corresponding to the dummy region on the top of the front substrate 1000. That is, the black layer 1050 is formed in a portion of the front substrate 1000 to cover the dummy region.

Then, even when the discharge occurs in the dummy region, the light generated in the dummy region is prevented from being emitted to the outside, and the contrast characteristic can be further improved by preventing the generation of the reflected light in the dummy region.

Here, reference numeral 1010 denotes a rear substrate, 1020 denotes a real layer, 1030 denotes a partition, and 1040 denotes a phosphor layer.

Next, FIG. 11 is a diagram for describing an image frame for implementing gradation of an image in a plasma display panel according to an exemplary embodiment of the present invention.

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

First, referring to FIG. 11, an image frame for implementing gray levels of an image in a plasma display panel according to an embodiment of the present invention may be divided into a plurality of subfields having different emission counts.

Although not illustrated, one or more subfields among the plurality of subfields may be grayed out according to a reset period for initializing all discharge cells, an address period for selecting discharge cells to be discharged, and the number of discharges. It can be divided into the sustain period (Sustain Period) that implements.

For example, in the case where an image is to be displayed with 256 gray levels, for example, one image frame is divided into eight subfields SF1 to SF8 as shown in FIG. 11, and each of the eight subfields SF1 to SF8, respectively. Can be subdivided into a reset period, an address period and a sustain period.

The gray scale weight of the corresponding subfield may be set by adjusting the number of the sustain signals supplied in the sustain period. That is, a predetermined gray scale weight can be given to each subfield using the sustain period. For example, the gray scale weight of each subfield is 2 ⁿ by setting the gray scale weight of the first subfield to 2 ⁰ and the gray scale weight of the second subfield to 2 ¹ (where n = 0, 1). , 2, 3, 4, 5, 6, and 7) to increase the gray scale weight of each subfield. As described above, the number of sustain signals supplied in the sustain period of each subfield is adjusted according to the gray scale weight in each subfield, thereby implementing gray levels of various images.

A plasma display panel according to an embodiment of the present invention uses a plurality of image frames to implement an image, for example, to display an image of 1 second. For example, 60 image frames are used to display an image of 1 second. In this case, the length T of one image frame may be 1/60 second, that is, 16.67 ms.

In FIG. 11, only one image frame is composed of eight subfields. However, the number of subfields constituting one image frame may be variously changed. For example, one video frame may be configured with 12 subfields from the first subfield to the twelfth subfield, or one video frame may be configured with 10 subfields.

In addition, in FIG. 11, subfields are arranged in the order of increasing magnitude of gray scale weight in one image frame. Alternatively, subfields may be arranged in order of decreasing gray scale weight in one image frame. Alternatively, subfields may be arranged regardless of the gray scale weight.

Next, referring to FIG. 12, an example of an operation of a plasma display panel according to an exemplary embodiment of the present invention in any one of a plurality of subfields included in an image frame as shown in FIG. 11 is shown.

First, the first ramp-down signal may be supplied to the first electrode Y in the pre-reset period before the reset period.

In addition, while the first falling ramp signal is supplied to the first electrode Y, a pre-sustain signal in a polarity opposite to the first falling ramp signal may be supplied to the second electrode Z.

Here, the first falling ramp signal supplied to the first electrode Y may gradually fall to the tenth voltage V10.

In addition, the pre-sustain signal can keep the pre-sustain voltage Vpz substantially constant. Here, the pre-sustain voltage Vpz may be a voltage of the sustain signal SUS supplied in a subsequent sustain period, that is, a voltage approximately equal to the sustain voltage Vs.

As such, when the first falling ramp signal is supplied to the first electrode Y and the presuspension signal is supplied to the second electrode Z in the pre-reset period, a wall of a predetermined polarity is formed on the first electrode Y. Wall charges are accumulated, and wall charges of opposite polarity to the first electrode Y are accumulated on the second electrode Z. For example, positive wall charges may be accumulated on the first electrode Y, and negative wall charges may be accumulated on the second electrode Z.

This makes it possible to generate a set-up discharge of sufficient intensity in the subsequent reset period, which in turn makes it possible to perform the initialization sufficiently stably.

In addition, even when the voltage of the rising ramp signal Ramp-Up supplied to the first electrode Y becomes smaller in the reset period, it is possible to generate the setup discharge of sufficient intensity.

From the viewpoint of securing the driving time, a pre-reset period is included before the reset period in the subfields arranged first in time among the subfields of the image frame, or before the reset period in two or three subfields of the subfields of the image frame. It is also possible to include a pre-reset period.

Alternatively, this pre-reset period may be omitted in all subfields.

After the pre-reset period, in a set-up period of a reset period for initialization, a ramp-up signal in a direction opposite to that of the first falling ramp signal may be supplied to the first electrode Y.

Here, the rising ramp signal may include a first rising ramp signal gradually increasing with a first slope from the twentieth voltage V20 to the thirtieth voltage V30 and the second rising ramp signal from the thirtieth voltage V30 to the forty-th voltage V40. It may include a second rising ramp signal rising to the slope.

In this 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.

Here, it is preferable that the second slope of the second rising ramp signal is gentler than the first slope. As such, when the second slope is made gentler than the first slope, the voltage is increased relatively quickly until the setup discharge occurs, and the voltage is increased relatively slowly while the setup discharge occurs. The amount of light generated by the setup discharge can be reduced.

Accordingly, the contrast characteristic can be improved.

In a set-down period after the set-up period, a second ramp-down signal in a direction opposite to that of the ramp ramp signal may be supplied to the first electrode Y after the ramp ramp signal.

Here, the second falling ramp signal may gradually fall from the 20th voltage V20 to the 50th voltage V50.

As a result, weak erase discharge, that is, 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.

Next, FIGS. 13A to 13B are diagrams for describing another form of the rising ramp signal or the second falling ramp signal.

First, referring to FIG. 13A, the rising ramp signal gradually increases from the thirtieth voltage V30 to the forty-th voltage V40 after rapidly rising to the thirtieth voltage V30.

In this manner, the rising ramp signal may be gradually raised at different inclinations over two stages as shown in FIG. 12, and may be gradually raised in one stage as shown in FIG. 13A, in various forms. It is possible to change.

Next, referring to FIG. 13B, the second falling ramp signal has a form in which the voltage gradually decreases from the thirtieth voltage V30.

As described above, the second falling ramp signal may be changed in various forms, such as a different point in time at which the voltage falls.

Meanwhile, in the address period after the reset period, a scan bias signal that substantially maintains a voltage higher than the 50 th voltage V50 of the second falling ramp signal may be supplied to the first electrode Y. FIG.

In addition, the scan signal Scan, which decreases from the scan bias signal by the scan voltage ΔVy, may be supplied to all of the first electrodes Y1 to Yn.

For example, the first scan signal Scan 1 is supplied to the first first electrode Y1 of the plurality of first electrodes Y, and then the second scan signal (2) is applied to the second first electrode Y2. Scan 2) is supplied, and the n-th scan signal Scan n is supplied to the n-th first electrode Yn.

On the other hand, the width of the scan signal in units of subfields may vary. That is, the width of the scan signal Scan in at least one subfield may be different from the width of the scan signal Scan in other subfields. For example, the width of the scan signal Scan in the subfield located later in time may be smaller than the width of the scan signal Scan in the subfield located earlier. In addition, the scan signal scan width decreases according to the arrangement order of the subfields gradually, such as 2.6 ms (microseconds), 2.3 ms (microseconds), 2.1 ms (microseconds), 1.9 ms (microseconds), and the like. Or 2.6 ㎲ (microseconds), 2.3 ㎲ (microseconds), 2.3 ㎲ (microseconds), 2.1 ㎲ (microseconds) ... 1.9 ㎲ (microseconds), 1.9 ㎲ (microseconds) It could be done.

As such, when the scan signal Scan is supplied to the first electrode Y, a data signal rising by the magnitude ΔVd of the data voltage may be supplied to the third electrode X to correspond to the scan signal.

As the scan signal Scan and the data signal Data are supplied, the voltage difference between the voltage of the scan signal and the data voltage Vd of the data signal and the wall voltage generated by the wall charges generated in the reset period are In addition, address discharge may occur in a discharge cell to which the voltage Vd of the data signal is supplied.

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

Here, the sustain bias signal may maintain a substantially constant sustain bias voltage Vz smaller than the voltage of the sustain signal supplied in the sustain period and greater than the voltage of the ground level GND.

Thereafter, the sustain signal SUS may be alternately supplied to the first electrode Y and / or the second electrode Z in the sustain period for displaying an image. The sustain signal SUS may have a magnitude of a voltage of ΔVs.

When the sustain signal SUS is supplied, the discharge cell selected by the address discharge is the first when the sustain voltage SUS is supplied when the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal SUS are added. A sustain discharge, that is, a display discharge, may be generated between the electrode Y and the second electrode Z.

Next, FIG. 14 is a diagram for explaining another type of the sustain signal.

Referring to FIG. 14, a positive sustain signal and a negative sustain signal are alternately supplied to any one of the first electrode Y or the second electrode Z, for example, the first electrode. do.

As such, while a positive sustain signal and a negative sustain signal are supplied to any one electrode, a bias signal may be supplied to the other electrode, for example, the second electrode Z.

Here, the bias signal may maintain the voltage of the ground level GND substantially constant.

As shown in FIG. 14, when the sustain signal is supplied only to one of the first electrode Y and the second electrode Z, one of the first electrode Y and the second electrode Z may be used. Only one driving board in which circuits for supplying a sustain signal is arranged is required.

As a result, the overall size of the driving unit can be reduced, thereby reducing the manufacturing cost.

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.

As described above in detail, in the plasma display panel according to the exemplary embodiment of the present invention, the discharge path in the dummy area is different from the path of the dummy discharge cell formed in the dummy area and the path of the effective discharge cell formed in the effective area. There is an effect that can prevent the occurrence, thereby preventing the degradation of the contrast characteristics and to prevent the deterioration of the image quality of the implemented image.

Claims (6)

A front substrate having a first electrode and a second electrode parallel to each other; A rear substrate disposed opposite the front substrate; And In the active area where an image between the front substrate and the rear substrate is displayed, an effective discharge cell is divided. In a dummy area disposed outside the effective area, the effective discharge cell and a traveling path are defined. A partition wall partitioning another dummy discharge cell; The first electrode and the second electrode which are different electrodes are disposed in the effective discharge cell, respectively. And the first electrodes, which are the same electrodes, are disposed together or the second electrodes are disposed together in the dummy discharge cell. The method of claim 1, And a size of at least one of the effective discharge cells and a size of at least one of the dummy discharge cells. The method of claim 1, And a black layer is further formed at a position corresponding to the dummy area on the front substrate. The method of claim 1, And a traveling path of the effective discharge cell and a traveling path of the dummy discharge cell. A front substrate having a first electrode and a second electrode parallel to each other; A rear substrate disposed opposite the front substrate; And An effective partition wall for partitioning an effective discharge cell in an active area in which an image between the front substrate and the rear substrate is displayed; and the first electrode in a dummy area disposed outside the effective area. A partition wall including a dummy partition wall covering a part of a region between the second electrodes; The dummy partition wall partitions a dummy discharge cell, And the first electrodes, which are the same electrodes, are disposed together or the second electrodes are disposed together in the dummy discharge cell. The method of claim 5, wherein And a width of the dummy partition wall is 50 µm or more and 500 µm or less.

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