KR100793031B1 - Plasma Display Apparatus - Google Patents

Abstract

The present invention relates to a plasma display device, and more particularly, to a plasma display device having an improved sustain signal.

One example of the plasma display apparatus according to the present invention is to supply the first, second and third types of different sustain signals to the plasma display panel and the scan electrode and the sustain electrode provided with the scan electrode and the sustain electrode. It includes a driver for supplying the more often than the second or third type of the sustain signal.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

1 is a view for explaining an example of a sustain signal supplied by a conventional driving unit.

2 is a view for explaining an example of a plasma display device according to the technical idea of the present invention.

3 is a view for explaining an example of the structure of a plasma display panel shown in FIG.

FIG. 4 is a view for explaining an example of a method in which the driving unit shown in FIG. 2 drives a plasma display panel.

5A and 5C are diagrams for explaining different sustain signals of the first, second and third types described above with reference to FIG.

FIG. 6 is a view for explaining an example in which three types of sustain signals shown in FIGS. 5A to 5C are mixed;

FIG. 7 is a view for explaining an example in which three types of sustain signals shown in FIG. 6 are mixed and supplied to panels differently for each subfield; FIG.

***** Explanation of symbols for the main parts of the drawing *****

200: driver 210: data driver

220: scan driver 230: sustain driver

300: plasma display panel

The present invention relates to a plasma display device, and more particularly, to a plasma display device having an improved sustain signal.

The plasma display apparatus includes a plasma display panel and a driver for supplying a predetermined driving signal to the plasma display panel.

In general, a plasma display panel is formed by a partition wall formed between a front panel and a rear panel, and forms a discharge cell. The discharge cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and a small amount of the discharge cell. The discharge gas containing xenon (Xe) is filled. These discharge cells constitute a plurality of pixels (Pixel) for displaying an image. For example, red (R), green (G), and blue (B) discharge cells gather to form one pixel.

When the plasma display panel is discharged by a high frequency voltage, the discharge gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration.

The driver supplies a driving signal for generating a discharge to the plasma display panel, and discharges such as reset discharge, address discharge, sustain discharge, etc. by the driving signal, and displays an image.

1 is a view for explaining a driving signal supplied to an electrode of a plasma display panel in a conventional sustain period.

As shown, the sustain signal Su is applied to the scan electrode Y and the sustain electrodes Z alternately in the sustain period. The cell selected by the address discharge has a sustain discharge, that is, a display discharge between the scan electrode Y and the sustain electrode Z each time the sustain signal is applied as the wall voltage in the cell and the voltage due to the sustain signal Sus are added. This will happen.

On the other hand, such a sustain signal has a problem that over-discharge occurs in a specific portion of the image implemented by the panel.

In addition, there are problems that various types of afterimages occur such as afterimages having a stripe shape crossing the horizontal or vertical direction of the panel and afterimages in which the same type of color is prominent at a specific portion of the panel.

In addition, there is a problem in that circular spots occur partially in the panel where the image is implemented.

In addition, the form of such a signal has a problem that the switching element is damaged by inducing overheating of the driving switching element by increasing the amount of voltage change per hour.

In order to solve this problem, the present invention provides a plasma image capable of realizing a clear image with improved overdischarge, various patterns of afterimage problems, and smearing problems occurring in a specific portion of the image while maintaining appropriate luminance of the image implemented in the panel. It is an object to provide a display device.

In addition, it is an object of the present invention to provide a plasma display device that can solve the overheating problem occurring in the driver when supplying a sustain signal by reducing the amount of voltage change per hour.

One example of a plasma display apparatus according to the present invention for solving the above technical problem is a plasma display panel having a first electrode and a second electrode disposed in parallel with the first electrode, and a first electrode and a second electrode. And a driver for supplying different types of sustain signals of one or two types, but more frequently supplying one type of sustain signals of either the first type or the second type.

Here, the driving unit may further supply a sustain signal of a third type different from the first and second types.

In addition, the driving unit is characterized in that to supply the sustain signal of any one type of the first, second, three types of sustain signals more frequently.

The sustain signal of the first type is characterized in that the voltage supply period of the sustain signal supplied to the second electrode overlaps with the voltage recovery period of the sustain signal supplied to the first electrode.

The sustain signal of the first type is characterized in that a period of 0.1 times or more and 0.9 times or less of a voltage supply period of the sustain signal supplied to the second electrode overlaps the voltage recovery period of the sustain signal supplied to the first electrode. .

In addition, the sustain signal of the second type is characterized in that the voltage sustain period of the sustain signal supplied to the second electrode overlaps with the voltage sustain period of the sustain signal supplied to the first electrode.

The sustain signal of the second type is characterized in that a period of 0.3 times or less of the voltage sustain period of the sustain signal supplied to the second electrode overlaps the voltage sustain period of the sustain signal supplied to the first electrode.

In addition, the third type sustain signal is characterized in that the voltage supply period is longer than the voltage supply period of the first type sustain signal.

The sustain signal of the third type is characterized in that the voltage supply period of the sustain signal supplied to the second electrode overlaps with the voltage recovery period of the sustain signal supplied to the first electrode.

The sustain signal of the third type is characterized in that a period of 0.1 times or more and 0.9 times or less of the voltage supply period of the sustain signal supplied to the second electrode overlaps the voltage recovery period of the sustain signal supplied to the first electrode. .

In addition, the third type sustain signal is characterized in that the voltage supply period of the sustain signal supplied to the first electrode is longer than the voltage supply period of the sustain signal supplied to the first electrode from the first type sustain signal.

The third type sustain signal is characterized in that the voltage supply period of the sustain signal supplied to the second electrode is longer than the voltage supply period of the sustain signal supplied to the second electrode from the first type sustain signal.

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

2 is a view for explaining an example of the plasma display device according to the technical idea of the present invention.

As shown, an example of the plasma display device according to the spirit of the present invention includes a plasma display panel 300 and the driving unit 200.

The front panel (not shown) and the rear panel (not shown) are bonded to the plasma display panel 300 at regular intervals, and a plurality of electrodes, for example, an address electrode X may be formed. The structure of the plasma display panel 300 will be described in more detail with reference to FIG. 3.

3 is a view for explaining an example of the structure of the plasma display panel shown in FIG.

Referring to FIG. 3, in the plasma display apparatus illustrated in FIG. 2, an example of the plasma display panel 300 may include a first electrode 302 and a second electrode (302), a second electrode (302) on a front substrate 311, which is a display surface on which an image is displayed. The plurality of address electrodes 323 intersect with the above-described first electrode 312 and Y and the second electrode 313 and Z on the front panel 310 and the rear substrate 321 forming the rear surface 313 and Z. , X) rear panel 320 is arranged side by side with a predetermined distance therebetween.

The front panel 310 is formed of a first electrode 312, Y and a second electrode 313, Z, that is, a transparent ITO material for mutual discharge in one discharge space, that is, a discharge cell and maintaining light emission of the discharge cell. The first electrodes 312 and Y and the second electrodes 313 and Z provided by the transparent electrodes 312a and 313a and the bus electrodes 312b and 313b made of a metal material are included in pairs. The first electrode 312 and Y and the second electrode 313 and Z are covered by one or more upper dielectric layers 314 that limit the discharge current and insulate the electrode pairs, and top surface of the upper dielectric layer 314. In order to facilitate discharge conditions, a protective layer 315 may be formed on which magnesium oxide (MgO) is deposited.

The rear panel 320 has a plurality of discharge spaces, that is, partition walls 322 of a stripe type (or well type) for forming discharge cells are arranged side by side. In addition, a plurality of address electrodes 323 and X for performing address discharge to generate vacuum ultraviolet rays may be arranged side by side with respect to the partition wall 322. On the upper side of the rear panel 320, R, G, and B phosphors 324 which emit visible light for image display during address discharge are coated. A lower dielectric layer 325 may be formed between the address electrodes 323 and X and the phosphor 324 to protect the address electrodes 323 and X.

In FIG. 3, only an example of a plasma display panel to which the present invention can be applied is shown and described, and the present invention is not limited to the plasma display panel 300 having the structure of FIG. 3. For example, in FIG. 3, the plasma display panel 300 is formed with the first electrodes 312 and Y, the second electrodes 313 and Z, and the address electrodes 323 and X. One or more of the first electrodes 312 and Y and the second electrodes 313 and Z may be omitted in the electrode of the plasma display panel 300 applied to the plasma display device.

In addition, in FIG. 3, only the first electrodes 312 and Y and the second electrodes 313 and Z described above are formed of the transparent electrodes 312a and 313a and the bus electrodes 312b and 313b, respectively. Alternatively, at least one of the first electrodes 312 and Y and the second electrodes 313 and Z may consist of only the bus electrodes 312b and 313b.

In addition, only the first electrodes 312 and Y and the second electrodes 313 and Z are included in the front panel 310, and only the address electrodes 323 and X are included in the rear panel 320. However, all the electrodes are formed on the front panel 310, or at least one of the first electrodes 312 and Y, the second electrodes 313 and Z, and the address electrodes 323 and X are partition walls 322. It is also possible to be formed on).

Here, the description of FIG. 3 is finished and the description of FIG. 2 is continued.

The driver 200 described above with reference to FIG. 2 provides the first and second types of different sustain signals to the first electrode 312 and Y and the second electrode 313 and Z in the sustain period for displaying an image. Supply the sustain signal of either type of the first or second type of sustain signal more frequently.

In this way, the driving unit mixes the first and second types of sustain signals having different functions other than the sustain discharge function and supplies them to the electrodes of the panel. Various afterimages of the image can be improved.

For example, it is possible to improve an afterimage of a line shape and an afterimage in which the same type of color is prominent in a specific area of the panel while maintaining the brightness of the image properly.

Here, it is preferable that the driving unit further supplies a sustain signal of a third type different from the first and second types.

By doing in this way, other types of afterimages which are not improved by the first and second types of sustain signals can be improved. For example, it is possible to improve circular spots that may occur sporadically in a panel on which an image is implemented.

In this way, by supplying a sustain signal of the third type different from the first and second types, it is possible to prevent more various afterimage patterns, thereby improving the margin of the signal to the afterimage.

In addition, it is preferable that the driver supplies the sustain signal of any one of the first, second, and third types more frequently.

By doing in this way, the afterimage pattern which generate | occur | produces more severely among the afterimages of various patterns can be improved more effectively.

For example, when the image brightness of the panel is relatively bright and the afterimage of the string is more severe among various afterimage patterns, the afterimage of the line may be more focused on the luminance while the luminance is relatively low.

A suitable example of the first, second, and third type sustain signals added with different functions as described above is as follows.

In the sustain signal of the first type, the voltage supply period of the sustain signal supplied to the second electrode Z overlaps with the voltage recovery period of the sustain signal supplied to the first electrode Y.

Such a first type of sustain signal has the same kind of function to improve overdischarge occurring at a specific portion of the image implemented by the panel while maintaining the brightness of the image implemented on the panel appropriately. It is possible to improve the afterimages in which the color of H is prominent. More details on this will be described with reference to FIG. 5A.

In addition, the sustain signal of the second type (Type) overlaps the voltage sustain period of the sustain signal supplied to the first electrode (Y) with the voltage sustain period of the sustain signal supplied to the second electrode (Z).

The second type of sustain signal may improve a line-shaped afterimage pattern appearing in a predetermined area across the horizontal or vertical direction of the panel on which the image is implemented. More details on this will be described with reference to FIG. 5B.

In the third type sustain signal, the third type sustain signal has a voltage supply period longer than that of the first type sustain signal, and a voltage supply period of the sustain signal supplied to the second electrode Z. It overlaps with the voltage recovery period of the sustain signal supplied to one electrode (Y).

Such a third type (sustain) type signal can improve circular spots occurring in some parts of the panel where the image is implemented. More details on this will be described with reference to FIG. 5C.

The number of times the first type sustain signal is supplied from among the first, second, and third type sustain signals having different functions as described above is the second type sustain signal or the third type. By more than the number of times the sustain signal is supplied, various afterimages can be improved while maintaining appropriately the luminance of the image.

2 illustrates an example in which the driver 200 includes a data driver 210, a scan driver 220, and a sustain driver 230. Alternatively, the sustain driver 230 and the scan driver 220 may be integrated into one. It may be. In the following description, for convenience of explanation, the description will be made based on the example shown in FIG. 2. In this case, it is more preferable that the scan driver 220 supplies the sustain signal to the first electrode Y, and the sustain driver 230 supplies the sustain signal to the second electrode Z. This will be described in more detail with reference to FIG. 4 to be described later.

Each of the drivers 210, 220, and 230 included in the driver 200 supplies a predetermined driving voltage to a plurality of electrodes formed in the plasma display panel 300 in one or more subfields included in one frame. Can drive a plurality of electrodes.

Preferably, the driver 210 supplies data to the address electrodes X ₁ to Xm formed in the plasma display panel 300, and the scan driver 220 provides the first electrode Y of the plasma display panel 300. ₁ to Yn, and the sustain driver 230 drives the second electrodes Z formed on the plasma display panel 300.

Here, the first, second, and third types of sustain signals may be supplied through the scan driver 220 and the sustain driver 230 of the driver 200.

As such, when the driving unit 200 of the plasma display apparatus includes each of the driving units 210, 220, and 230 described above, each of the driving units 210, 220, and 230 described above may include a plurality of the plasma display panel 300. An example of a driving method for driving the electrodes of the present invention will be described in detail with reference to FIG. 4.

FIG. 4 is a diagram for describing an example of a method in which the driving unit shown in FIG. 2 drives the plasma display panel.

Referring to FIG. 4, each of the driving units 210, 220, and 230 included in the driving unit 200 described above with reference to FIG. 2 includes the address electrode X and the first electrode in at least one of a reset period, an address period, and a sustain period. The driving voltage is supplied to the first electrode Y and the second electrode Z.

As illustrated in FIG. 3, the scan driver 220 of the driver 200 may supply a set-up signal to the first electrode Y in the setup period of the reset period.

Due to the setup signal, a weak dark discharge occurs in the discharge cells of the entire screen. Due to this setup discharge, positive wall charges are accumulated on the address electrode X and the second electrode Z, and negative wall charges are accumulated on the first electrode Y.

In addition, the scan driver 220 of the driver 200 supplies the set-up signal Set-dn to the first electrode Y in the set-down period, and then exceeds the maximum voltage of the set-up signal Set-up. The set-dn signal may be supplied to start falling from a low voltage and drop to a specific voltage level below the ground (GND) level voltage.

As a result, a weak erase discharge is generated in the discharge cell, thereby sufficiently erasing wall charges excessively formed in the discharge cell. As a result of the discharge in the set down period, wall charges such that the address discharge can stably occur remain uniformly in the discharge cell.

In the address period, the scan driver 220 of the driver 200 supplies a negative scan signal falling from the scan reference voltage Vsc to the first electrode Y. In addition, the data driver 210 of the driver 200 supplies a positive data signal to the address electrode X in response to the above-described scan signal. As the voltage difference between the scan signal and the data signal and the wall voltage generated in the reset period are added, an address discharge is generated in the discharge cell to which the data signal is applied. In the discharge cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied. Accordingly, the first electrode Y is scanned.

In the sustain period after the address period, the scan driver 220 and the sustain driver 230 of the driver 200 alternately apply the sustain signal SUS to the first electrode Y and the second electrode Z, respectively. Can be supplied.

Here, as described above, the first and second types of sustain signals are mixed and supplied as described above, and the frequency of the sustain signals of any one type of the first and second types of sustain signals is supplied. Is fed higher.

In addition, the sustain signal of the third type may be further mixed and supplied, and the frequency of the sustain signal of any one of the three types may be supplied higher.

Accordingly, the discharge cell selected by the address discharge is disposed between the first electrode Y and the second electrode Z whenever the sustain signal sus is applied while the wall voltage and the sustain signal sus are added in the discharge cell. Sustain discharge, that is, display discharge, occurs.

Such a driving method has been described according to an example, and an erase period may be further added.

Here, the first, second, and third types of sustain signals supplied to the scan driver 220 and the sustain driver 230 in the sustain period will be described with reference to FIGS. 5A, 5B, and 5C.

5A and 5C are diagrams for explaining different sustain signals of the first, second, and third types described above with reference to FIG. 4.

First, FIG. 5A shows a sustain signal of a first type. As shown, the voltage recovery period Y_er_dn1 of the sustain signal supplied to the first electrode Y is the voltage supply period Z_er_up1 of the sustain signal supplied from the type to the second electrode Z in the first type of sustain signal. It is preferable to overlap with).

Also, it is preferable that the sustain voltage supply period in the first sustain signal is shorter than the sustain voltage recovery period.

In addition, the voltage supply periods Z_er_up1 and Y_er_up1 of the sustain signals supplied to the electrodes Y and Z in the first sustain signal are the same, and the voltage recovery periods of the sustain signals supplied to the electrodes Y and Z are the same. (Z_er_dn1, Y_er_dn1) are preferably the same.

Here, the voltage supply or recovery period of the sustain signal means a period in which a voltage is supplied from the capacitor of the energy recovery circuit disposed in the driving unit to the panel or is recovered from the panel to the capacitor of the energy recovery circuit. The voltage holding period of the sustain signal means a period in which the sustain voltage is supplied to the panel from the constant voltage source without voltage exchange between the panel and the capacitor.

In this case, the voltage supply period, the sustain period, and the recovery period of each sustain signal may be supplied with a signal from a control (not shown) to adjust the switching timing of the driving unit 200 to adjust the period. In addition, the sustain voltage supplied may be a voltage in the positive direction or a voltage in the negative direction.

Here, as an example, a case in which a sustain signal in the positive direction is supplied for convenience of explanation.

By doing so, there is an effect that the overdischarge generated in a specific portion of the image implemented by the panel is improved. In addition, the afterimage, in which the same type of color is prominent at a specific portion of the panel, is improved.

The reason for this is as follows.

As shown in FIG. 5A, when the sustain signal is supplied, the discharge is generated twice in the discharge cell by the sustain signal. One time, a discharge occurs in the sustain voltage supply period Y_er_up1 of the first electrode Y, and the other time, a discharge occurs in the voltage supply period Z_er_up1 of the second electrode Z.

At this time, in the voltage supply period Y_er_up1 of the first electrode Y, the superimposition with the sustain signal of the second electrode Z does not occur. However, in the sustain voltage supply period Z_er_up1 of the second electrode Z, the first electrode Y does not overlap. Overlap with the sustain voltage recovery period Y_er_dn1 of the electrode Y occurs.

Therefore, since the voltage across the panel changes simultaneously during the overlapping period (YZ_ov1), the voltage across the panel changes more rapidly than the non-overlapping period, so that the discharge of the second electrode Z occurs more strongly.

Such unbalanced discharge characteristics of the first electrode Y and the second electrode Z prevent the wall charges from becoming stuck and improve overdischarge and afterimage occurring in a region of a specific portion of the panel.

 In this case, the overlapping period YZ_ov1 is 0.1 times or more and 0.9 times less than the voltage supply period Z_er_up1 of the sustain signal supplied to the second electrode Z. The sustain signal is supplied to the first electrode Y. It is preferable to overlap with the voltage recovery period Y_er_dn1.

In this manner, the voltage recovery period of the sustain signal supplied to the first electrode Y is a period YZ_ov1 of 0.1 to 0.9 times the voltage supply period Z_er_up1 of the sustain signal supplied to the second electrode Z. When overlaid with Y_er_dn1), overdischarge and afterimage improvement are more remarkably effective.

In this case, the first electrode may be overlapped with the voltage recovery period Y_er_dn1 of the sustain signal supplied to the first electrode Y by at least 0.1 times the period of the voltage supply period Z_er_up1 of the sustain signal. This is to cause the discharge of the second electrode Z to occur more strongly than the discharge generated at (Y).

In addition, a period YZ_ov1 equal to or less than 0.9 times the voltage supply period Z_er_up1 of the sustain signal supplied to the second electrode Z overlaps with the voltage recovery period Y_er_dn1 of the sustain signal supplied to the first electrode Y. This is to ensure that the most suitable discharge is generated to improve such overdischarge and afterimage when overdischarge and afterimage occurring in a specific area of the panel occur.

5B is a diagram illustrating a second type of sustain signal. As shown, the second type of sustain signal has a voltage sustain period Z_Vs2 of the sustain signal supplied to the second electrode Z to overlap the voltage sustain period Y_Vs2 of the sustain signal supplied to the first electrode Y. It is desirable to be.

In addition, it is preferable that the voltage supply period Y_er_up2 of the sustain signal supplied to the first electrode Y is shorter than the voltage falling period Y_er_dn2.

By doing in this way, there exists an effect that the afterimage of a stripe across a horizontal direction or a vertical direction of a panel is improved.

The reason for this is that the voltage holding periods of the sustain signal overlap, so that in the second type of sustain signal, the discharge occurs twice only at the first electrode Y, and the voltage supply of the sustain signal supplied to the first electrode Y is supplied. This is because two unbalanced discharges occur only at the first electrode Y because the period Y_er_up2 is shorter than the voltage falling period Y_er_dn2.

Therefore, such discharge imbalance in the same electrode line can improve the afterimage of a stripe across the horizontal or vertical direction of the panel.

Here, the overlapping period YZ_ov2 is a voltage sustain period of the sustain signal supplied to the first electrode Y by 0.3 times or less of the voltage sustain period Z_Vs2 of the sustain signal supplied to the second electrode Z. It is preferable to overlap with Y_Vs2).

In this way, by overlapping the period of 0.3 times or less, the minimum period for overlapping is ensured so that the overlap is stable and the margin for the sustain period is appropriately secured.

Fig. 5C shows a third type of sustain signal. As shown, the voltage supply period of the sustain signal of the third type is longer than the voltage supply period of the sustain signal of the first type, and the voltage supply period Z_er_up3 of the sustain signal supplied to the second electrode Z is the first. It is preferable that the voltage recovery period Y_er_dn3 of the sustain signal supplied to the electrode Y overlaps.

The voltage supply period Y_er_up3 of the third type sustain signal supplied to the first electrode Y may be longer than the voltage supply period Y_er_up1 of the first type sustain signal supplied to the first electrode Y. In addition, it is preferable that the voltage supply period Z_er_up3 of the third type sustain signal supplied to the second electrode Z is longer than the voltage supply period Z_er_up3 of the third type sustain signal supplied to the second electrode Z. Do.

In addition, it is preferable that the voltage rise period of the third type of sustain signal is shorter than the voltage fall period.

In this way, spherical spots that occur sporadically in the panel on which the image is implemented are improved. More specifically, the sustain signal voltage supply period of the third type is longer than the voltage supply period of the first type sustain signal and overlaps similarly to the sustain signal of the first type, so that the discharge caused by the first sustain signal is reduced. This is to induce weaker discharge and at the same time improve circular staining that is weaker than the strong afterimage of a specific area improved by the first sustain signal and occurs sporadically throughout the entire area of the panel.

In addition, by lengthening the voltage supply period of the third type sustain signal longer than the first type sustain signal, overheating of the switching element disposed in the driver for supplying the sustain signal can be improved.

More specifically, the rate of change in voltage per hour can be further reduced by supplying a sustain signal of a type in which the voltage supply period of the sustain signal is relatively long. Accordingly, the magnitude of the current that can be controlled by the switching element can be reduced, and the amount of impact applied to the switching element by the voltage change can be reduced, thereby preventing overheating of the switching element.

Here, the overlapping period (YZ_ov3) is a period of 0.1 times or more than 0.9 times the voltage supply period (Z_er_up3) of the sustain signal supplied to the second electrode (Z) of the sustain signal supplied to the first electrode (Y). It is preferable to overlap the voltage recovery period Y_er_up3.

The overlapping period YZ_ov3 is 0.1 times or more in order to cause the discharge to be stronger than the discharge occurring in the voltage supply period Y_er_up3 of the sustain signal supplied to the first electrode Y. This is to secure.

The overlapping period YZ_ov3 is 0.9 times or less because the spots appearing in the image implemented in the panel are most appropriately improved in the overlapping period YZ_ov3 is 0.9 times or less.

5A to 5C have described the types of different sustain signals of the first, second, and third types, but an example in which these three types of sustain signals are mixed will be described with reference to FIG. 6.

FIG. 6 is a view for explaining an example in which three types of sustain signals shown in FIGS. 5A to 5C are mixed.

As shown in FIG. 6, the driving unit according to the exemplary embodiment of the present invention supplies the first, Y, and second electrodes Z with different sustain signals of the first, second, and third types. It is desirable to supply the sustain signal more often than the second or third type of sustain signal.

In this way, various kinds of afterimages as described above are improved and sporadic spots are improved while maintaining the luminance of the image implemented in the panel according to the first type of sustain signal. In addition, it is possible to prevent over heating of the switching elements arranged in the driving unit for supplying three kinds of sustain signals.

In addition, by inducing sustain discharge by mixing various sustain signals of the first, second, and third types in this way, the margin of the sustain signal for more various afterimages or stains generated in the entire panel can be further improved.

In FIG. 6, the driving unit of the present invention has only been described as an example of supplying a mixture of sustain signals in the order of the first, second, first, and third types, but differently from the first, third, first, and second types of sustain signals. The sustain signal may be supplied by variously changing the sustain signals of the first, second, third, and first types.

Until now, only the example in which the first, second, and third types of sustain signals are mixed and supplied in one subfield has been described, but in FIG. 7, the three types of sustain signals are mixed and used in one frame. An example which can be demonstrated is demonstrated.

FIG. 7 is a view for explaining an example in which three types of sustain signals shown in FIG. 6 are mixed and supplied to a panel differently for each subfield.

As shown in FIG. 7, one frame is composed of 12 subfields. Each of the twelve subfields may be supplied with an appropriate driving signal for each period in at least one of the reset period, the address period, and the sustain period. The reset period and the address period have approximately the same time regardless of the gray level. . However, in the sustain period, the supply time of the sustain signal becomes longer as the higher gray level of the subfield is increased. This is because the higher the gray level, the more sustain signals are required.

As shown in the 12 subfields, three different types of sustain signals are more preferably supplied in the high gray subfield.

This is because it is not applicable when the number of the sustain signals is small in order to mix three different types of sustain signals.

In more detail, the number of sustain signals is supplied relatively low in the low gray subfield, and the number of sustain signals of three different types cannot be mixed. In addition, since afterimages or stains occur more severely in the high gradation subfield, the effect of overheating of the switching elements disposed in the driving unit in the high gradation subfield becomes more significant. By mixing and supplying different types of sustain signals, the efficiency can be further increased.

Although FIG. 8 illustrates that three different types of sustain signals are mixed and supplied from the second subfield to the twelfth subfield as described above, the fourth subfield may be supplied only from the fourth subfield or the like. Whether three different types of sustain signals are mixed and supplied from the field may vary depending on various conditions such as driving characteristics and discharge characteristics of the panel.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive.

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. .

As described above, the plasma display apparatus according to the present invention maintains the luminance of an image implemented in a panel by supplying three different tri-type sustain signals and increasing the frequency of supplying one of the sustain signals. In addition, there is an effect that can improve afterimages appearing in a specific area, afterimages of stripe pattern, and circular spots that occur sporadically throughout the panel.

In addition, there is an effect of preventing overheating of the switching element disposed in the driving unit by relatively lengthening the voltage supply period of one type of the sustain signal of the three different types of sustain signals.

Claims (12)

A plasma display panel including a first electrode and a second electrode disposed in parallel with the first electrode; The first electrode and the second electrode have a sustain signal of a first type, A sustain signal of the second type which is different from the first type and whose voltage sustain period of the sustain signal supplied to the second electrode overlaps with the voltage sustain period of the sustain signal supplied to the first electrode. And a driver for supplying a sustain signal of any one type of the first and second types of sustain signals more frequently. The method of claim 1, And the driving unit further supplies a third type of sustain signal different from the first and second types and having a voltage supply period longer than the voltage supply period of the first type sustain signal. The method of claim 2, And the driving unit supplies a sustain signal of any one type of the first, second, and third types of signals more frequently. The method of claim 1, And the voltage supply period of the sustain signal supplied to the second electrode overlaps the voltage recovery period of the sustain signal supplied to the first electrode. The method of claim 4, wherein The sustain signal of the first type is characterized in that a period of 0.1 times or more than 0.9 times the voltage supply period of the sustain signal supplied to the second electrode overlaps the voltage recovery period of the sustain signal supplied to the first electrode. Plasma display device. delete The method of claim 1, Wherein the sustain signal of the second type has a period equal to or less than 0.3 times the voltage sustain period of the sustain signal supplied to the second electrode and overlaps the voltage sustain period of the sustain signal supplied to the first electrode. Device. delete The method of claim 2, And wherein the sustain signal of the third type overlaps the voltage recovery period of the sustain signal supplied to the first electrode with the voltage supply period of the sustain signal supplied to the second electrode. The method of claim 9, The sustain signal of the third type is characterized in that a period of 0.1 times or more than 0.9 times the voltage supply period of the sustain signal supplied to the second electrode overlaps the voltage recovery period of the sustain signal supplied to the first electrode. Plasma display device. The method of claim 9, Wherein the voltage supply period of the sustain signal supplied to the first electrode is longer than the voltage supply period of the sustain signal supplied to the first electrode from the first type sustain signal. . The method of claim 9, Wherein the voltage supply period of the sustain signal supplied to the second electrode is longer than the voltage supply period of the sustain signal supplied to the second electrode from the first type sustain signal. .

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