KR20080062326A - Plasma display apparatus - Google Patents

Abstract

A plasma display panel is provided to improve the luminance of light by differently setting time differences between adjacent sustain signals. A first electrode(102) and a second electrode(103) are arranged in parallel on a front substrate(101). A rear substrate(111) is arranged to be opposite to the front substrate. The first electrode and the second electrode are asymmetric. Sustain signals are respectively supplied to the first electrode and the second electrode during a sustain period of a subfield. Time differences between adjacent two sustain signals are different. The number of the first electrodes are different from the number of the second electrodes. A width of the first electrode is different from a width of the second electrode. A first sustain signal is supplied to the first electrode during the sustain period, a second sustain signal is supplied to the second electrode, and a third sustain signal is supplied to the first electrode. The time difference between the first sustain signal and the second sustain signal is different from a time difference between the second sustain signal and the third sustain signal.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

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

FIG. 2 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display panel according to an exemplary embodiment of the present invention. FIG.

3 is a view for explaining an example of an operation of a plasma display panel according to an embodiment of the present invention in a subfield included in an image frame;

4A to 4B are diagrams for explaining an example of a first electrode and a second electrode.

5A to 5B are views for explaining still another example of the first electrode and the second electrode.

6 is a diagram for explaining a sustain signal in more detail.

7A to 7B are views for explaining in detail the time difference between two adjacent sustain signals.

8 is a diagram for explaining an example of a method for setting a time difference between two adjacent sustain signals.

9 is a diagram for explaining another example of the sustain signal.

<Explanation of symbols 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: partition wall 113: third electrode

114: phosphor layer 115: lower dielectric layer

112a: second partition 112b: first partition

The present invention relates to a plasma display device (Plasma Display Apparatus).

In general, the plasma display device includes 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.

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.

An embodiment of the present invention improves the structure of at least one of the first electrode or the second electrode, and improves the time difference between the sustain signals supplied to the first electrode and the second electrode in the sustain period, thereby improving driving efficiency. The purpose is to provide a device.

A plasma display device according to an embodiment of the present invention for achieving the above object comprises a front substrate and a rear substrate disposed opposite to the front substrate and the first electrode and the second electrode parallel to each other, The second electrode is asymmetrical, and a sustain signal is supplied to the first electrode and the second electrode in the sustain period of the subfield, respectively, and the time difference between two adjacent sustain signals is differential.

Also, the number of first electrodes is different from the number of second electrodes.

In addition, the width of the first electrode is different from the width of the second electrode.

Further, in the sustain period, the first sustain signal is supplied to the first electrode, the second sustain signal is supplied to the second electrode, and the third sustain signal is then supplied to the first electrode, and the first sustain signal and the second sustain signal are supplied. The time difference of the sustain signal is different from the time difference of the second sustain signal and the third sustain signal.

In addition, at least one of the width or number of the first electrodes is greater than or greater than at least one of the width or number of the second electrodes, and the time difference between the first sustain signal and the second sustain signal is equal to the second sustain signal and the third sustain signal. Is greater than the time difference of the signal.

The time difference between the first sustain signal and the second sustain signal is 7/3 or more and 9 times or less than the time difference between the second sustain signal and the third sustain signal.

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

The plasma display apparatus includes a plasma display panel. The plasma display panel is described with reference to FIG. 1.

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, a plasma display panel according to an embodiment of the present invention may face the front substrate 101 and the front substrate 101 on which the first and second electrodes 102 and 103 are arranged in parallel with each other. The rear substrate 111 on which the third electrode 113 disposed and intersects the first electrode 102 and the second electrode 103 is disposed is bonded to each other.

Although not shown, the first electrode 102 and the second electrode 103 are asymmetrical. The first electrode 102 and the second electrode 103 will be described in more detail later.

On top of the front substrate 101 where the first electrode 102 and the second electrode 103 are disposed, a dielectric layer covering the first electrode 102 and the second electrode 103, for example, an upper dielectric layer 104, is provided. Can be arranged.

This upper dielectric layer 104 limits the discharge current of the first electrode 102 and the second electrode 103 and can insulate between the first electrode 102, Y and the second electrode 103, Z. have.

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

Meanwhile, an electrode, for example, a third electrode 113 is disposed on the rear substrate 111, and a dielectric layer covering the third electrode 113 is disposed on the rear substrate 111 on which the third electrode 113 is disposed. Dielectric layer 115 may be disposed.

The lower dielectric layer 115 may insulate the third electrode 113.

In addition, a partition 112 having a discharge space, that is, a stripe type, a well type, a delta type, a honeycomb type, and the like, which partitions a discharge cell, is formed on an upper portion of the lower dielectric layer 115. Can be arranged. Accordingly, red (R), green (G), and blue (B) discharge cells may be provided 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.

Meanwhile, although the widths of the red (R), green (G), and blue (B) discharge cells in the plasma display panel according to an embodiment of the present invention may be substantially the same, red (R) and green (G) may be substantially the same. And the width of at least one of the blue (B) discharge cells may be different from that of the 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.

The width of the phosphor layer 114, which will be described later, disposed in the discharge cell is then changed in relation to the width of the discharge cell. For example, the width of the blue (B) phosphor layer disposed in the blue (B) discharge cell is wider than the width of the red (R) phosphor layer disposed in the red (R) discharge cell, and at the same time in the green (G) discharge cell. The width of the green (G) phosphor layer disposed may be wider than the width of the red (R) phosphor layer disposed in the red (R) discharge cell.

Then, color temperature characteristics of the image to be implemented may be improved.

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. Etc. may be possible.

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.

Meanwhile, although FIG. 1 shows and describes each of the red (R), green (G), and blue (B) discharge cells arranged on the same line, it may be arranged in a different shape. For example, a delta type arrangement in which red (R), green (G) and blue (B) discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may also be a variety of polygonal shapes, such as pentagonal, hexagonal, as well as rectangular.

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.

Here, a predetermined discharge gas may be filled in the discharge cell partitioned by the partition wall 112. For example, discharge gas, such as neon (Ne), argon (Ar), xenon (Xe), is 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, red (R), green (G), and blue (B) phosphor layers may be disposed.

In addition to the red (R), green (G), and blue (B) phosphors, a white (W) and / or yellow (Y) phosphor layer may be further disposed.

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, the thickness of the phosphor layer of the green (G) discharge cell, ie the phosphor layer in the green (G) phosphor layer or the blue (B) discharge cell, ie the blue (B) phosphor layer, is It may be thicker than the thickness of the phosphor layer, ie the red (R) phosphor layer. Here, the thickness of the green (G) phosphor layer may be substantially the same as or different from the thickness of the blue (B) phosphor layer.

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 above description shows only the case where the upper dielectric layer number 104 and the lower dielectric layer number 115 are each one layer, but one or more of the upper dielectric layer or the lower dielectric layer is a plurality of layers. It is also possible to make.

In addition, a black matrix (not shown) may be further disposed on the partition 112 to prevent reflection of external light due to the partition 112. In addition, the black matrix may be formed at a specific position on the front substrate 101 corresponding to the partition wall 112.

In addition, although the width or thickness of the third 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. will be. For example, the width or thickness inside the discharge cell may be wider or thicker than that outside the discharge cell.

Next, FIG. 2 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 2, an image frame for implementing gray levels of an image in a plasma display panel according to an exemplary embodiment of the present invention may be divided into a plurality of subfields having different emission counts.

Although not shown, one or more subfields among the plurality of subfields may be grayed out according to a reset period for initializing 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, when an image is to be displayed in 256 gray scales, for example, one image frame is divided into eight subfields SF1 to SF8 as shown in FIG. 2, 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. 2, 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. 2, the subfields are arranged in the order of increasing magnitude of gray scale weight in one image frame. Alternatively, the 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, FIG. 3 is a diagram for explaining an example of an operation of a plasma display panel according to an embodiment of the present invention in a subfield included in an image frame.

Referring to FIG. 3, in the set-up period of the reset period for initialization, the voltage rises from the first voltage V1 to the second voltage V2 with the first electrode and then from the second voltage V2 to the third voltage. A ramp-up signal is supplied in which the voltage gradually rises to V3. Here, the first voltage V1 may be a voltage of the ground level GND.

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.

In a set-down period after the setup period, a ramp-down signal in a direction opposite to that of the ramp ramp signal is supplied to the first electrode after the ramp ramp signal.

Here, the falling ramp signal may gradually fall from the peak voltage of the rising ramp signal, that is, the fourth voltage V4 lower than the third voltage V3 to the fifth voltage V5.

As the falling ramp signal is supplied, a weak erase discharge, that is, a setdown 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 the lowest voltage of the falling ramp signal, that is, a voltage higher than the fifth voltage V5, for example, the sixth voltage V6, is supplied to the first electrode.

In addition, a scan signal falling by a scan voltage (Vy) from the scan bias signal may be supplied to the first electrode.

On the other hand, the width of the scan signal in units of subfields may vary. That is, the width of the scan signal in at least one subfield may be different from the width of the scan signal in 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 (microseconds), 2.3 Hz, 2.1 Hz, 1.9 Hz, or 2.6 Hz, 2.3 Hz, 2.3 Hz, 2.1 Hz. .... 1.9 ㎲, 1.9 ㎲ and so on.

As such, when the scan signal is supplied to the first electrode, a data signal that rises by the magnitude of the data voltage (Vd) may be supplied to the third electrode to correspond to the scan signal.

As 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 caused by the wall charges generated in the reset period are added. have.

Here, the sustain bias signal may be supplied to the second electrode to prevent the address discharge from becoming unstable due to the interference of the second electrode 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, a sustain signal may be supplied to the first electrode and the second electrode in the sustain period for displaying an image. Preferably, the sustain signal is supplied to the first electrode 102 and the second electrode 103, respectively.

In addition, the time difference between two adjacent sustain signals is differential. This sustain signal will be described in more detail later.

When such a sustain signal is supplied, the discharge cell selected by the address discharge is sustained discharge between the first electrode and the second electrode when the sustain signal is supplied while the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal are added. , Display discharge may occur.

In this way, an image may be implemented on the screen of the plasma display panel.

4A to 4B are diagrams for explaining an example of the first electrode and the second electrode.

First, referring to FIG. 4A, the first electrode 102 and the second electrode 103 are asymmetrical. For example, the width W1 of the first electrode 102 is different from the width W3 of the second electrode 103.

Here, an address discharge is generated between the first electrode 102 and the third electrode (not shown) by supplying a scan signal to the first electrode 102 in the address period among the first electrode 102 and the second electrode 103. In consideration of the above, it is preferable that the width W1 of the first electrode 102 is larger than the width W2 of the second electrode 103.

As such, when the width W1 of the first electrode 102 is larger than the width W2 of the second electrode 103, the efficiency of the address discharge occurring in the address period may be improved.

In addition, the first electrode 102 and the second electrode 103 may include transparent electrodes 102a and 103a and bus electrodes 102b and 103b as shown in FIG. 4A.

Here, the transparent electrodes 102a and 103b may include a transparent material such as indium tin oxide (ITO).

In addition, the bus electrodes 102b and 103b may include a metal material having excellent electrical conductivity such as silver (Ag).

Meanwhile, the first black layers 410 and 420 may be disposed between the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b.

Here, the first black layers 410 and 420 preferably have a darker color than at least one of the first electrode 102 and the second electrode 103. The first black layers 410 and 420 may include a material having a substantially dark color, for example, ruthenium (Ru) or carbon (C) material.

The first black layers 410 and 420 prevent the light incident from the outside from being reflected by the first electrode 102 and the second electrode 103.

Next, referring to FIG. 4B, unlike the case of FIG. 4A, the first electrode 102 and the second electrode 103 are one layer. Preferably, the first electrode 102 and the second electrode 103 are omitted from a transparent material such as indium tin oxide (ITO) and substantially the same as the bus electrodes 102b and 103b of FIG. 4A. It may be made of the same material.

In addition, the first electrode 102 includes a 1-1 electrode 102c and a 1-2 electrode 102d, and the second electrode 103 includes a 2-1 electrode 103c and a 2-2. It may include an electrode 103d.

In addition, in the case of FIG. 4B, the first electrode 102 and the second electrode 103 are asymmetrical, and the width W3 of the first-first electrode 102c and the width (the width of the 1-2-electrode 102d) W4 may be greater than the width W5 of the second-first electrode 103c and the width W6 of the second-second electrode 103d.

Meanwhile, second black layers 430a, 430b, 440a, and 440b may be further disposed between the first electrode 102 and the second electrode 103 and the front substrate 101.

The second black layers 430a, 430b, 440a, and 440b may be formed of substantially the same material as the first black layers 410 and 420 of FIG. 4A.

Next, FIGS. 5A to 5B are diagrams for describing still another example of the first electrode and the second electrode. 5A to 5B, descriptions thereof will be omitted.

First, referring to FIG. 5A, the first electrode 502 and the second electrode 503 are asymmetrical, and more specifically, the number of the first electrode 502 and the number of the second electrodes 503 are different from each other.

Here, an address discharge is generated between the first electrode 502 and the third electrode (not shown) by supplying a scan signal to the first electrode 502 among the first electrode 502 and the second electrode 503 in the address period. In consideration of the above, it is preferable that the number of the first electrodes 502 is larger than the number of the second electrodes 503.

As such, the first electrode 502 is the main electrode 502 of the first electrode 502 and the second electrode 503 so that the number of the first electrodes 502 is greater than the number of the second electrodes 503. -1) and the auxiliary electrode 502-2.

Here, the auxiliary electrode 502-2 is disposed at a position closer to the center of the discharge cell than the main electrode 502-1. In other words, the distance between the auxiliary electrode 502-2 and the second electrode 503 of the first electrode 502 is smaller than the distance between the main electrode 502-1 and the second electrode 503.

Here, when the main electrode of the number 502-1 and the auxiliary electrode of the number 502-2 are regarded as the first electrode 502, respectively, the number of the first electrodes 502 is larger than the number of the second electrodes 503.

As such, when the number of the first electrodes 502 is greater than the number of the second electrodes 503, the efficiency of the address discharge occurring in the address period may be improved.

On the other hand, the main electrode 502-1 of the first electrode 502 preferably includes a transparent electrode 502a and a bus electrode 502b.

Here, when the auxiliary electrode 502-2 is a substantially opaque electrode, the luminance of an image to be realized may be reduced by decreasing the aperture ratio. Therefore, the auxiliary electrode 502-2 preferably includes a transparent electrode. That is, the auxiliary electrode 502-2 is a transparent electrode.

In addition, the second electrode 503 includes a transparent electrode 503a and a bus electrode 503b.

As described above, when the first electrode 502 includes the auxiliary electrode 502-2 and the main electrode 502-1, when the discharge is generated between the first electrode 502 and the second electrode 503. The auxiliary electrode 502-2 may lower the discharge voltage between the first electrode 502 and the second electrode 503 by performing a function of an igniter. As described above, the discharge start voltage is lowered, so that the amount of discharge current generated is reduced, and the discharge efficiency is improved.

In addition, the discharge ignited between the auxiliary electrode 502-2 of the first electrode 502 and the second electrode 503 is diffused toward the main electrode 502-1 of the first electrode 502, and then Main discharge occurs between the first electrode 502 and the main electrode 502-1 and the second electrode 503. Accordingly, the discharge generated between the auxiliary electrode 502-2 of the first electrode 502 and the second electrode 503 while lowering the discharge start voltage between the first electrode 502 and the second electrode 503. Can be diffused more easily behind the discharge cell, so that the luminance of the image can be improved.

Next, referring to FIG. 5B, as in the case of FIG. 5A, the number of first electrodes 500 is different from the number of second electrodes 510. Preferably, the number of the first electrodes 500 is greater than the number of the second electrodes 510. In addition, the first electrode 500 and the second electrode 510 are a single layer as in the case of FIG. 4B.

As described above, the number of the first electrode 500 and the second electrode 510 may be different while the first electrode 500 and the second electrode 510 are formed as a single layer.

Next, FIG. 6 is a diagram for explaining the sustain signal in more detail.

Referring to FIG. 6, a sustain signal is supplied to a first electrode and a second electrode in a sustain period of a subfield, where the time difference between two adjacent sustain signals is differential.

In more detail, in the sustain period, the first sustain signal SUS 1 is supplied to the first electrode, the second sustain signal SUS 2 is supplied to the second electrode, and the third sustain signal () is then supplied to the first electrode. Assuming that SUS 3 is supplied, the time difference t1 between the first sustain signal SUS 1 and the second sustain signal SUS 2 is equal to the second sustain signal SUS 2 and the third sustain signal SUS 3. ) Is different from the time difference (차이 t2). Preferably, the time difference t1 between the first sustain signal SUS 1 and the second sustain signal SUS 2 is the time difference between the second sustain signal SUS 2 and the third sustain signal SUS 3 ( Greater than t2). Here, at least one of the width or number of the first electrodes is greater than or greater than at least one of the width or number of the second electrodes as in the case of FIGS. 4A to 4B and 5A to 5B.

As described above, when at least one of the width or the number of the first electrodes is greater than or greater than at least one of the width or the number of the second electrodes, the reason for differentially making a time difference between two adjacent sustain signals will be described. As follows.

For example, assume that at least one of the number or width of the first electrodes is smaller or smaller than at least one of the number or width of the second electrodes.

In this case, the time difference ㅿ t1 between the first sustain signal SUS 1 and the second sustain signal SUS 2 is determined by the time difference between the second sustain signal SUS 2 and the third sustain signal SUS 3 ( Larger than ㅿ t2), the intensity of the sustain discharge generated by the first sustain signal SUS 1 supplied to the first electrode having a relatively high electrical resistance because the width is smaller or smaller than that of the second electrode is increased. It can be relatively weak. Accordingly, although the luminance of generated light is not sufficient, priming particles may be sufficiently generated in the discharge cell.

However, after the first sustain signal SUS 1 is supplied, a time difference from the time when the second sustain signal SUS 2 is supplied, that is, between the first sustain signal SUS 1 and the second sustain signal SUS 2. Since the time difference t1 is sufficiently large, most of the priming particles generated in the discharge cell by the first sustain signal SUS 1 are extinguished due to the neutralization combined with the space charge in the discharge cell. Accordingly, even when the second sustain signal SUS 2 is supplied to the second electrode, it is difficult to sufficiently use the priming particles with the second sustain signal SUS 2. Accordingly, the intensity of the sustain discharge generated by the second sustain signal SUS 2 is not strong enough.

On the other hand, at least one of the number or width of the second electrode is larger or larger than that of the first electrode. As a result, the intensity of the discharge generated by the second sustain signal SUS 2 is stronger than the intensity of the sustain discharge generated by the first sustain signal SUS 1, so that most of the priming particles are erased in the discharge cell.

Subsequently, when the third sustain signal SUS 3 is supplied to the first electrode, the discharge generated by the third sustain signal SUS 3 by eliminating most of the priming particles in the discharge cell by the second sustain signal SUS 2. The intensity of is relatively weak.

As a result, the brightness and the driving efficiency are lowered.

On the other hand, the time of the first sustain signal SUS 1 and the second sustain signal SUS 2 when at least one of the number or width of the first electrodes is greater than or greater than at least one of the number or width of the second electrodes. If the difference ㅿ t1 is larger than the time difference ㅿ t2 between the second sustain signal SUS 2 and the third sustain signal SUS 3, the width is larger or larger than that of the second electrode. The intensity of the sustain discharge generated by the first sustain signal SUS 1 supplied to the first electrode having a relatively small resistance is sufficiently strong, and a time sufficient for the sustain discharge to sufficiently diffuse in the discharge cell can be ensured.

Thereafter, when the second sustain signal SUS 2 is supplied to the second electrode, a relatively weak sustain discharge occurs because the electric resistance value of the second electrode is relatively larger than that of the first electrode. Accordingly, priming particles may be sufficiently generated in the discharge cells.

Thereafter, when the third sustain signal SUS 3 is supplied to the first electrode, since the time difference t2 between the second sustain signal SUS 2 and the third sustain signal SUS 3 is sufficiently short, the second sustain signal ( The priming particles generated in the discharge cell can be sufficiently utilized by the sustain discharge generated by SUS 2), whereby a sufficiently strong sustain discharge is generated.

Accordingly, the luminance can be increased and the driving efficiency can be improved.

On the other hand, if the fourth sustain signal SUS 4 is supplied to the first electrode after the third sustain signal SUS 3 is supplied, the third sustain signal SUS 3 and the fourth sustain signal SUS 4 may be separated from each other. The time difference ㅿ t3 may be substantially the same as or different from the time difference ㅿ t1 between the first sustain signal SUS 1 and the second sustain signal SUS 2.

As described above, the time difference between the sustain signals is described in more detail with reference to FIGS. 7A to 7B.

Next, FIGS. 7A to 7B are diagrams for describing in detail the time difference between two adjacent sustain signals.

In FIGS. 7A to 7B, the time difference ㅿ t1 and the second sustain signal SUS 2 and the third sustain between the first sustain signal SUS 1 and the second sustain signal SUS 2 as shown in FIG. 6. Occurs when the ratio of the time difference t2 of the signal SUS 3 is a value between 1/9 and 9/1, that is, when t1 is between 1/9 and 9/1 times less than t2. The brightness and driving efficiency of the light are measured.

7A to 7B, when 경우 t1 is 1/9 times or more than 5/5 times less than ㅿ t2, the luminance has a relatively small value between 2515 and 2460 for the same reason as described in detail in FIG. It can be seen that the driving efficiency has a relatively small value between 1.615 and 1.57.

In addition, when ㅿ t1 is between 5/5 times and 6/4 times of ㅿ t2, the time of ㅿ t2 is excessively long, and therefore, priming particles generated by the second sustain signal SUS 2 are used as the third sustain signal SUS. 3) is difficult to fully utilize, and thus the luminance has an excessively small value of approximately 2450, and the driving efficiency has a relatively small value between 1.56 and 1.55.

On the other hand, when ㅿ t1 is 7/3 or more than 9 times less than ㅿ t2, the ratio of ㅿ t1 and ㅿ t2 is appropriate, so that the luminance is sufficiently large between about 2550 and 2710, and the driving efficiency is 1.70 to 1.83 It can be seen that has a relatively large value of.

In consideration of this, the time difference t1 between the first sustain signal SUS 1 and the second sustain signal SUS 2 is the time difference between the second sustain signal SUS 2 and the third sustain signal SUS 3. It is preferable that they are 7/3 times or more and 9 times or less of (xt2).

Next, FIG. 8 is a diagram for explaining an example of a method for setting a time difference between two adjacent sustain signals.

Referring to FIG. 8, the sustain signal supplied to the first electrode and the sustain signal supplied to the second electrode each include a voltage rising period, a voltage sustain period, and a voltage falling period.

Here, the time difference between the sustain signal supplied to the first electrode and the sustain signal supplied to the second electrode is the end of the voltage sustain period of the sustain signal supplied to the first electrode and the sustain supplied to the second electrode. It may be a difference between the start time points of the voltage sustain period of the signal.

Next, FIG. 9 is a figure for explaining another example of the sustain signal.

Referring to FIG. 9, the time difference 1t10 between the first sustain signal SUS 1 and the second sustain signal SUS 2 is the time difference between the second sustain signal SUS 2 and the third sustain signal SUS 3. Greater than (t30), and the time difference between the end of the voltage drop period of the first sustain signal SUS 1 and the start of the voltage rise period of the second sustain signal SUS 2 is? T20, and the second The sustain signal SUS 2 and the third sustain signal SUS 3 may overlap for a time of t40.

In this manner, it is also possible to superimpose two adjacent sustain signals while making the differential time difference between two adjacent sustain signals different.

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 device according to the embodiment of the present invention, the first electrode and the second electrode are asymmetrical, and the driving time is improved by differentially setting the time difference between adjacent sustain signals. In addition, there is an effect that the brightness of the generated light is improved.

Claims (6)

A front substrate having a first electrode and a second electrode arranged in parallel with each other; A rear substrate disposed opposite the front substrate Including, The first electrode and the second electrode are asymmetric, And a sustain signal is supplied to the first electrode and the second electrode in the sustain period of the subfield, and the time difference between two adjacent sustain signals is differential. The method of claim 1, And the number of the first electrodes is different from the number of the second electrodes. The method of claim 1, The width of the first electrode is different from the width of the second electrode plasma display device The method of claim 1, In the sustain period, a first sustain signal is supplied to the first electrode, a second sustain signal is supplied to the second electrode, and a third sustain signal is then supplied to the first electrode. And a time difference between the first sustain signal and the second sustain signal is different from a time difference between the second sustain signal and the third sustain signal. The method of claim 4, wherein At least one of the width or number of the first electrode is greater than or greater than at least one of the width or number of the second electrode, And the time difference between the first sustain signal and the second sustain signal is greater than the time difference between the second sustain signal and the third sustain signal. The method of claim 5, wherein And a time difference between the first sustain signal and the second sustain signal is 7/3 or more and 9 times or less than a time difference between the second sustain signal and the third sustain signal.

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