KR100573163B1 - Driving method of plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a method of driving a plasma display panel by dividing the panel into a plurality of groups so that addressing and sustaining discharge for each group can be stably performed.

In order to achieve the above object, the present invention includes a plurality of subfields in a unit frame to perform gradation display by time division driving, wherein each subfield has a reset, a mixed drive, and a correction sustain period. In the driving method of a plasma display panel which is driven by grouping display electrode line pairs composed of lines and sustain electrode lines into two or more display electrode line pair groups, the mixed driving period is sequentially addressed for each group. Two or more group address periods; And one or more group sustain periods in which sustain discharge is performed on the addressed display electrode line pair groups between the group address periods, and in the group address periods, the scan electrode lines of each group for addressing by group The first voltage is applied to the field, and the scan pulse having the second voltage is sequentially applied. In the group sustain periods, the third voltage and the ground voltage are sequentially applied to all the scan electrode lines, and the group is not addressed. And a fourth voltage of negative polarity is further applied to the scan electrode lines of the plasma display panel.

Description

Driving method of plasma display panel {Driving method of plasma display panel}

1 shows a conventional address display separation driving scheme for scan electrode lines.

2 is a timing for explaining an example of a conventional driving signal for driving a three-electrode plasma display panel.

3 is a diagram illustrating a method of driving address display mixing according to an embodiment of the present invention.

4 is a view illustrating in detail a driving process of the first subfield SF1 of FIG. 3.

FIG. 5 is a diagram illustrating in detail a driving process of the fourth subfield SF4 of FIG. 3.

FIG. 6 is a timing diagram illustrating a driving process of the fourth subfield SF4 of FIG. 5 as a driving signal according to the present invention.

7A to 7C are views schematically showing wall charge states in discharge cells at times t1 to t3 of FIG. 6.

<Explanation of symbols for the main parts of the drawings>

A1, ..., Am ... address electrode lines,

X1, ..., Xn ... holding electrode lines,

Y1, ..., Yn ... scanning electrode lines,

XYG1, XYG2 ... first and second display electrode line pair groups,

R1, ..., R8 ... reset periods,

M1, ..., M8 ... mixed drive periods,

C1, ..., C8 ... calibration maintenance periods,

AS1, ..., AS8 ... selective retention periods,

CS1, ..., CS8 ... common retention periods,

Vsch ... first voltage, Vscl ... second voltage,

Vs ... the third voltage, Vnf ... the fourth voltage,

Va ... fifth voltage, Vb ... sixth voltage,

Vset ... seventh voltage, Vset + Vs ... eighth voltage,

Vm ... ninth voltage.

The present invention relates to a method of driving a plasma display panel having a three-electrode structure.

Japanese Laid-Open Patent Publication No. 1999-120924 discloses a structure of a conventional plasma display panel. That is, address electrode lines, dielectric layers, scan electrode lines, sustain electrode lines, phosphor layers, barrier ribs, and magnesium monoxide (MgO) protective layers are provided between the front and back substrates of a conventional plasma display panel.

The address electrode lines are formed in a predetermined pattern on the front side of the back substrate. The back dielectric layer is applied to the front of the address electrode lines. In the front of the rear dielectric layer, barrier ribs are formed in a direction parallel to the address electrode lines. These partitions partition the discharge area of each discharge cell and serve to prevent optical interference between the discharge cells. The phosphor layer is applied in front of the rear dielectric layer on the address electrode lines between the partition walls, and a red light emitting phosphor layer, a green light emitting phosphor layer, and a blue light emitting phosphor layer are sequentially disposed.

The sustain electrode lines and the scan electrode lines are formed in a constant pattern on the rear side of the front substrate so as to be orthogonal to the address electrode lines. Each intersection sets a corresponding display cell. Each sustain electrode line and each scan electrode line may be formed by combining a transparent electrode line of a transparent conductive material such as indium tin oxide (ITO) and a metal electrode (bus electrode) line for increasing conductivity. The front dielectric layer is formed by coating the entire surface behind the sustain electrode lines and the scan electrode lines. A protective layer for protecting the panel from a strong electric field, for example, a magnesium monoxide (MgO) layer is formed by applying the entire surface to the rear of the front dielectric layer layer. The plasma forming gas is sealed in the discharge space.

In order to drive the three-electrode structure, in general, an ADS (Address Display Separation) driving method is generally used, which will be described with reference to FIG. 1.

1 shows a conventional address display separation driving scheme for scan electrode lines.

Referring to the drawings, a unit frame may be divided into a predetermined number, for example, eight subfields SF1, ..., SF8 to realize time division gray scale display. Further, each subfield SF1, ... SF8 is divided into a reset section (not shown), an address section A1, ..., A8, and a sustain discharge section S1, ..., S8. .

In each address section A1, ..., A8, a display data signal is applied to the address electrode lines and scan pulses corresponding to each of the scan electrode lines Y1, ..., Yn are sequentially applied.

After each type of address section A1, ..., A8, in each sustain discharge section S1, ..., S8, the scan electrode lines Y1, ..., Yn and the sustain electrode lines ( The sustain pulses are alternately applied to X1, ..., Xn to cause sustain discharge in the discharge cells in which wall charges are formed in the address sections A1, ..., A8.

The luminance of the plasma display panel is proportional to the number of sustain discharge pulses in the sustain discharge sections S1, ..., S8 occupied in the unit frame, and one frame forming one image is represented by eight subfields and 256 gray levels. In this case, each subfield may be assigned a number of different sustain pulses in a ratio of 1, 2, 4, 8, 16, 32, 64, and 128 in order. In this case, in order to obtain the luminance of 133 gray levels, cells may be addressed and sustained and discharged during the subfield 1 period, the subfield 3 period, and the subfield 8 period.

The number of sustain discharges allocated to each subfield can be variably determined according to the weights of the subfields according to the APC (Automatic Power Control) step, and can be variously modified in consideration of gamma characteristics or panel characteristics.

2 is a timing for explaining an example of a conventional driving signal for driving a three-electrode plasma display panel. One subfield SF includes a reset period PR, an address period PA, and a sustain discharge period PS.

First, the reset period PR applies a reset pulse to all the scan electrode lines Y1,..., And Yn to perform reset discharge, thereby initializing the wall charge state of all the discharge cells. The reset period PR is carried out before entering the address period PA, which is carried out over the entire screen, thus making it possible to create a fairly even and evenly distributed wall charge arrangement. To this end, as shown in FIG. 2, the ground voltage Vg is first applied to the scan electrode lines Y1,..., And Yn, and then the sustain discharge voltage Vs is applied, and the sustain discharge voltage Vs is applied. The rising ramp signal is applied to reach the highest rising voltage (Vset + Vs), which is increased by the rising voltage (Vset), and then rapidly falls to the sustain discharge voltage (Vs), and the ramp ramp signal from the sustain discharge voltage (Vs). Is applied to reach the lowest falling voltage (Vnf). The ground voltage Vg is applied to the address electrode lines A1, A2, ..., Am during the reset period PR, and the falling ramp signal is applied to the sustain electrode lines X1, ..., Xn. The bias voltage Vb is continuously applied from time to time.

Next, in the address period PA, in order to select a cell to be turned on, a bias voltage Vb is applied to the sustain electrode lines X1, ..., Xn, and the scan electrode lines Y1,. The scan high voltage Vsch is applied to Yn, and the scan pulses having the scan low voltage Vscl are sequentially applied to the scan electrode lines Y1, ..., Yn. A display data signal having an address voltage Va is applied to the address electrode lines A1, A2, ..., Am. As the scan pulse and the display data signal are applied, address discharge is performed in the selected discharge cell.

Next, in the sustain discharge period PS, the sustain electrode lines X1,..., Xn and the scan electrode lines Y1, so that the sustain discharge is performed in the cell to be turned on selected in the address period PA. ..., and a sustain pulse having a sustain discharge voltage Vs is applied alternately. The sustain pulse has a rising slope and reaches a sustain discharge voltage, and has a falling slope and reaches a ground voltage. The sustain discharge is performed by the wall charge accumulated in the discharge cell selected by the address discharge and the applied sustain discharge voltage Vs. Plasma is formed from the plasma forming gas of the discharge cells which perform the sustain discharge, and the phosphors of the discharge cells are excited by ultraviolet radiation from the plasma to generate light.

On the other hand, the conventional ADS (Address Display Separation) driving method for driving a plasma display panel having a three-electrode structure performs addressing in the sustain discharge period only after addressing all the scan electrode lines sequentially during the address period for each subfield. This is done. In order to realize a plasma display panel of high quality, according to a trend of increasing the number of scan electrode lines, an address period increases as the number of scan electrode lines increases, and wall charges accumulated by address discharge in the discharge cells in which addressing is performed first are performed. There is a problem that the maintenance discharge is not performed stably in the maintenance discharge period is disturbed.

The present invention, in order to solve the above problems, in the method of driving a plasma display panel having a three-electrode structure, by improving the problems in the address display separation driving method, the addressing and sustaining discharge for each group stably An object of the present invention is to provide a method of driving a plasma display panel to be performed.

In order to achieve the above object, the present invention, the display electrode line pairs of the pair of the sustain electrode line and the scan electrode line are formed side by side, the plasma is formed so that the address electrode lines are spaced apart and cross the display electrode line pairs For the display panel, a plurality of subfields are included in a unit frame to perform gradation display by time division driving, wherein each subfield has a reset period, a mixed driving period, a correction sustain period, and two or more display electrode line pairs. A driving method of a plasma display panel driven by grouping display electrode line pair groups,

The mixed driving period may include two or more group address periods in which addressing is sequentially performed for each display electrode line pair group; And one or more group sustain periods in which sustain discharge is performed on the addressed display electrode line pair groups between the group address periods.

In the group address periods, a first voltage is applied to the scan electrode lines of each of the display electrode line pair groups, and a scan pulse having a second voltage is sequentially applied to the display electrode line pairs to address the group.

In the group sustain periods, a third voltage and a ground voltage are sequentially applied to all the scan electrode lines, and a negative fourth voltage is applied to the scan electrode lines of the group of display electrode line pairs that are not addressed in the group address periods. The present invention provides a method of driving a plasma display panel, which is further applied.

According to another aspect of the present invention, in the group address periods, a display data signal having a fifth voltage is applied to address electrode lines in accordance with a scanning pulse, and a sixth voltage is applied to all sustain electrode lines,

In the group sustain periods, it is preferable that the ground voltage and the third voltage are sequentially applied to all sustain electrode lines.

According to another feature of the invention, the correction holding period,

A selective sustain period in which sustain discharge is selectively performed on the display electrode line pair groups so that the number of sustain discharges in all the display electrode line pair groups match according to the gray scale weight value of each subfield; And a common sustain period in which sustain discharge is performed in common for all display electrode line pair groups.

According to another feature of the invention, the reset period,

A third voltage is applied to all of the scan electrode lines, a rising ramp signal is applied at the third voltage to reach an eighth voltage which is finally raised by the seventh voltage, and a falling ramp signal is applied at the third voltage to finally generate the third voltage. When the voltage reaches 4, the sixth voltage is preferably applied to all the sustain electrode lines, and the ground voltage is applied to all the address electrode lines.

According to still another aspect of the present invention, in order to make the number of sustain discharges of the display electrode line pair groups equal to each other in the selective sustain period, the ground voltage and the third voltage are sequentially applied to all sustain electrode lines, and sustain discharge is performed. The ninth voltage and the ground voltage are sequentially applied to the scan electrode lines of the display electrode line pair group that do not need to be performed, and the third voltage and the scan electrode lines of the display electrode line pair group to which the sustain discharge is further performed. Ground voltage is applied sequentially,

In the common sustain period, it is preferable that a sustain pulse having a third voltage and a ground voltage is alternately applied to all the scan electrode lines and the sustain electrode lines.

According to another feature of the invention, the magnitude of the ninth voltage is preferably smaller than the magnitude of the third voltage.

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

3 illustrates an address display mixing driving method according to an embodiment of the present invention. As in the case of the embodiment of FIG. 3, display electrode line pairs, which are pairs of sustain electrode lines and scan electrode lines, may be grouped into two display electrode line pair groups. For example, as shown in the drawing, the display panel is divided from the first display electrode line pair group XYG1 to the second display electrode line pair group XYG2 in the lower direction.

Reference numerals SF1 to SF8 denote subfields allocated within the unit frame, XYG1 to XYG2 denote display electrode line pair groups as reference for driving objects, R1 to R8 for reset times, and M1 to M8 for respective group addresses. Periods and mixed driving periods having respective group sustain periods which come between the respective group address periods, C1 to C8 indicate correction sustain periods. AS1 to AS8 indicate selected sustain periods provided in each correction sustain period, and CS1 to CS8 indicate common sustain periods provided in each correction sustain period, respectively.

At the reset times R1 to R8, the charge states of all the discharge cells become uniform.

The mixed drive periods M1 to M8 have two group address periods and one group sustain period. Addressing, that is, address discharge, is performed for each display electrode line pair group in each group address period, and sustain discharge is performed for each display electrode line pair group in the group sustain period between the group address periods.

The correction sustain periods C1 to C8 include the selective sustain periods AS1 to AS8 and the common sustain periods CS2 to CS8. In the selection sustain periods AS1 to AS8, the display electrode line pairs are selectively selected so that the number of sustain discharges in each display electrode line pair group is the same by correcting the difference in the number of sustain discharges displayed for each display electrode line pair group in the mixed driving period. Perform maintenance discharge on the group. The common sustain period CS1 to CS8 compares the number of sustain discharges up to the selected sustain period with the number of sustain discharges according to the gray scale weight value so that the insufficient number of sustain discharges is performed in common for all display electrode line pair groups. Here, when one frame forming one image is represented by eight subfields and 256 gradations, each subfield is sequentially different at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. Sets that the gray scale weight value is assigned.

The detailed description will be described with reference to FIGS. 4 and 5.

4 is a view illustrating in detail a driving process of the first subfield SF1 of FIG. 3.

First, in the reset period R1, a scan pulse is applied to all the scan electrode lines to initialize the discharge cells by making the wall charge states of all the discharge cells uniform.

Next, in the mixed driving period M1, the address discharge step AG1 is performed in the first display electrode line pair group XYG1 during the first group address period PA1. Next, a sustain discharge step S11 is performed for the first display electrode line pair group XYG1 that has been addressed in the first group sustain period PS1. Next, the address discharge step AG2 is performed in the second display electrode line pair group XYG2 during the second group address period PA2.

In the correction sustain period C1, that is, the select sustain period AS1, the sustain discharge step S21 is performed for the second display electrode line pair group XYG2 that has been addressed in the second group address period PA2. Since the gray scale weight value of the first subfield SF1 is 1, the common sustain period does not exist.

FIG. 5 is a diagram illustrating in detail a driving process of the fourth subfield SF4 of FIG. 3.

First, in the reset period (R4), the scan pulse is applied to all the scan electrode lines to uniform the wall charge state of all the discharge cells to initialize the discharge cells.

Next, in the mixed driving period M4, the address discharge step AG1 is performed in the first display electrode line pair group XYG1 during the first group address period PA1. Next, a sustain discharge step S11 is performed for the first display electrode line pair group XYG1 that has been addressed in the first group sustain period PS1. Next, the address discharge step AG2 is performed in the second display electrode line pair group XYG2 during the second group address period PA2.

In the selection sustain period AS4 of the correction sustain period C4, the sustain discharge step S21 is performed on the second display electrode line pair group XYG2 that has been addressed in the second group address period PA2.

Next, in the common sustain period CS4 of the correction sustain period C4, seven sustain discharge steps S12 to S18 for the first display electrode line pair group XYG1 to satisfy the gray scale weight value 8 of the fourth subfield. Are provided with seven sustain discharge steps S22 to S28 for the second display electrode line pair group XYG2, respectively. Therefore, the total number of sustain discharges in the fourth subfield is eight times.

Subfields other than the fourth subfield described above are also driven in the manner described above.

FIG. 6 is a timing diagram illustrating a driving process of the fourth subfield SF4 of FIG. 5 as a driving signal according to the present invention.

7A to 7C are views schematically showing wall charge states in the discharge cells at the times t1 to t3 of FIG. 6.

Hereinafter, a description will be given with reference to FIGS. 6 and 7A to 7C.

The present invention provides a method of driving a plasma display panel which is driven by grouping display electrode line pairs into two or more display electrode line pair groups, wherein the display is performed such that addressing is sequentially performed for each display electrode line pair group in group address periods. The first voltage Vsch is applied to the scan electrode lines of each electrode line pair group, and the scan pulses having the second voltage Vscl are sequentially applied. In the group sustain periods between the group address periods, the display voltage to which the third voltage Vs and the ground voltage Vg are sequentially applied to all the scan electrode lines is sequentially applied, except that addressing is not performed in the group address periods. A negative fourth voltage Vnf is further applied to the scan electrode lines of the line pair group so that addressing is smoothly performed in the corresponding display electrode line pair group in the next group address period.

 First, in the reset period R4, all the scan electrode lines Y1,..., Yn of the first display electrode line pair group and the second display electrode line pair group are distributed evenly to distribute the wall charge states of the entire discharge cells. The same reset pulse is applied. Accordingly, the third voltage Vs, which is the sustain discharge voltage, is applied to all the scan electrode lines Y1,..., And Yn, and a rising ramp signal is applied at the third voltage Vs to finally obtain the rising voltage. The eighth voltage Vset + Vs, which is the rising highest voltage rising by the seventh voltage Vset, is reached, and a falling ramp signal is applied at the third voltage Vs, and finally, the fourth voltage Vnf, which is the falling lowest voltage. A reset pulse is applied to reach. Meanwhile, a sixth voltage Vb, which is a bias voltage, is applied to all sustain electrode lines X1, ..., Xn of the first to second display electrode line pair groups when the falling ramp signal is applied. The ground voltage Vg is applied to the address electrode lines A1, ..., Am. Meanwhile, the magnitude of the sixth voltage Vb may be the same as the magnitude of the third voltage Vs as shown in FIG. 6. In the power supply device for supplying various power levels of the plasma display panel, as the number of power levels increases, the number of converters is required and the manufacturing cost increases. Thus, the size of the sixth voltage Vb is illustrated in FIG. 6. It is preferable that the same as the magnitude of the third voltage (Vs).

As the rising ramp function is applied during the reset period R4, weak discharge occurs in the discharge cells, positive wall charges accumulate near the scan electrodes, and negative wall charges near the sustain electrodes and the address electrodes. Will accumulate. As the falling ramp function is applied, weak discharge occurs in the discharge cells, positive wall charges accumulated near the scan electrode are erased, and negative wall charges accumulated near the sustain electrode and the address electrode are erased. Therefore, the wall charge state of all the discharge cells becomes uniform. As shown in FIG. 7A, a small amount of negative wall charges are accumulated in the vicinity of the scan electrode and a very small amount of negative wall in the vicinity of the sustain electrode as shown in FIG. 7A. Charges are accumulated, and a small amount of positive wall charges is accumulated in the vicinity of the address electrode. This wall charge causes smooth addressing (address discharge) to be performed in the group address period in the mixed driving period.

Next, in the mixed driving period M4, addressing and sustain discharge are performed simultaneously.

First, in the first group address period PA1, addressing, that is, address discharge, is sequentially performed on the first display electrode line pair group. That is, the first voltage Vsch, which is the scan high voltage, is applied to the scan electrode lines Y1,..., Yn / 2 of the first display electrode line group, and the second voltage Vscl, which is the scan low voltage, is sequentially applied. A scanning pulse with In this case, a display data signal having a fifth voltage Va which is an address voltage is applied to the address electrode lines A1, Am, and the sustain electrode lines X1,. The sixth voltage Vb is continuously applied to Xn. The magnitude of the sixth voltage Vb may be equal to the magnitude of the third voltage Vs as shown in the figure. Inside the discharge cell due to the display data signal, the scan pulse, and the wall voltage due to the positive wall charges accumulated near the address electrode in the reset period, and the wall voltage due to the negative wall charges accumulated near the scan electrode. An address discharge is performed between the address electrode and the scan electrode, whereby negative wall charges accumulate near the sustain electrode, and positive wall charges accumulate near the scan electrode. Meanwhile, the ground voltage Vg is applied to the scan electrode lines Yn / 2 + 1,..., Yn of the second display electrode line group.

Next, in the first group sustain period PS1, one sustain discharge is performed for the first display electrode line pair group. To this end, first, the third voltage Vs is applied to all the scan electrode lines Y1, ..., Yn, and at this time, the ground voltage Vg is applied to all the sustain electrode lines X1, ..., Xn. ) Is applied. In the first group address period PA1, the wall voltage due to the positive wall charges accumulated near the scan electrodes of the first display electrode line pair group, the wall voltage due to the negative wall charges accumulated near the sustain electrode, and the scan electrodes The discharge start voltage is reached by the third voltage Vs applied to the sustain discharge, and wall charges of negative polarity are accumulated near the scan electrodes, and positive wall charges are accumulated near the sustain electrodes. On the other hand, since wall charges are not accumulated in the vicinity of the scan electrode and the sustain electrode of the second display electrode line pair group, even if the third voltage Vs is applied to the scan electrode, the discharge start voltage does not reach and sustain discharge is not performed. . However, since the third voltage Vs is also applied to the scan electrode lines Yn / 2 + 1,..., Yn of the second display electrode line pair group, as shown in FIG. 7B, the second display electrode line at time t2. A large amount of negative wall charges accumulates near the scan electrodes of the pair group, a very small amount of negative wall charges accumulates near the sustain electrode, and a large amount of positive wall charges accumulates near the address electrode. Wall charge state becomes uneven, In the addressing of the second display electrode line pair group in the second group address period PA2, an unstable address discharge may occur. In order to prevent this, after the time t2, the ground voltage Vg is applied to all the scan electrode lines Y1,..., And Yn. At this time, all the sustain electrode lines X1,... The third voltage Vs is applied to Xn. As a result, the wall voltage caused by the negative wall charges accumulated near the scan electrodes of the first display electrode line pair group, the wall voltage caused by the negative wall charges accumulated near the sustain electrodes, and the third applied to the sustain electrodes The sustain discharge is performed by reaching the discharge start voltage by the voltage Vs, positive wall charges are accumulated near the scan electrodes, and negative wall charges are accumulated near the sustain electrodes. Meanwhile, after the ground voltage Vg is applied to the scan electrode lines Yn / 2 + 1,..., Yn of the second display electrode line pair group, a fourth negative voltage Vnf of the negative polarity is further applied. . The fourth voltage Vnf is applied with a falling slope. Although the wall charges are not accumulated near the scan electrode and the sustain electrode of the second display electrode line pair group, even when the third voltage Vs is applied to the sustain electrode, the sustain discharge is not performed because the discharge start voltage is not reached. By further applying a negative fourth voltage Vnf to have a falling slope, at time t3, a large amount of negative wall charges do not accumulate near the scanning electrode as shown in FIG. 7B, and the falling slope As a result, the negative wall charges are erased, and as a result, as shown in FIG. 7C, a small amount of negative wall charges accumulates near the scan electrode, and a small amount of positive wall charges accumulates near the address electrode. Accordingly, the discharge cells of the second display electrode line pair group maintain a uniform wall charge state before the addressing is performed, and the addressing of the second display electrode line pair group, that is, the address discharge is stable in the second group address period PA2. To be performed.

On the other hand, one sustain discharge described in the text includes a sustain discharge performed by applying a third voltage Vs to the scan electrode and a ground voltage Vg to the sustain electrode, and a ground voltage Vg to the scan electrode. It means that it comprises a sustain discharge is applied and is performed by applying a third voltage (Vs) to the sustain electrode.

Next, in the second group address period PA2, addressing, that is, address discharge, is sequentially performed on the second display electrode line pair group. That is, the first voltage Vsch, which is the scan high voltage, is applied to the scan electrode lines Yn / 2 + 1, ..., Yn of the second display electrode line group, and then the second voltage that is the scan low voltage in sequence. A scanning pulse with Vscl is applied. In this case, a display data signal having a fifth voltage Va which is an address voltage is applied to the address electrode lines A1, Am, and the sustain electrode lines X1,. The sixth voltage Vb is applied to Xn. The magnitude of the sixth voltage Vb may be equal to the magnitude of the third voltage Vs as shown in the figure. By the display data signal and the scan pulse, an address discharge is performed between the address electrode and the scan electrode in the discharge cell, whereby negative wall charges accumulate near the sustain electrode, and a positive wall near the scan electrode. Charges accumulate. Meanwhile, the ground voltage Vg is applied to the scan electrode lines Y1,..., Yn / 2 of the first display electrode line group.

Next, the correction sustain period C4 consists of the selective sustain period AS4 and the common sustain period CS4. In the selective sustain period AS4, sustain discharge is selectively performed on the first display electrode line pair group and the second display electrode line pair group. One sustain discharge was performed in the first display electrode line pair group in the mixed driving period M4, but no sustain discharge was not performed in the second display electrode line pair group. Therefore, the second display electrode in the selective sustain period AS4. One sustain discharge is performed only in the line pair group, and no sustain discharge is performed in the first display electrode line pair group. For this purpose, the ground voltage Vg and the third voltage Vs are sequentially applied to all sustain electrode lines X1,..., Xn. While the ground voltage Vg is applied to the sustain electrode lines, the ninth voltage Vm, which is an intermediate voltage, is applied to the scan electrode lines of the first display electrode line pair group, and the ninth voltage Vm of the second display electrode line pair group is applied. The third voltage Vs is applied to the scan electrode lines, and the ground voltage Vg is applied to the address electrode lines. That is, the ninth voltage Vm having a smaller magnitude than the third voltage Vs is applied to the scan electrode lines Y1,..., Yn / 2 of the first display electrode line pair group, thereby providing a discharge starting voltage. In this case, the sustain discharge is not performed in the first display electrode line pair group XYG1, but the scan electrode lines Yn / 2 + 1, ..., Yn in the second display electrode line pair group XYG2. The third voltage Vs is applied to the sustain discharge. By performing the sustain discharge, negative wall charges are accumulated near the scan electrodes, and positive wall charges are accumulated near the sustain electrodes. Meanwhile, while the third voltage Vs is applied to all the sustain electrode lines X1,..., Xn, the ground voltage Vg is applied to all the scan electrode lines Y1,..., Yn. The ground voltage Vg is applied to the address electrode lines. In the first display electrode line pair group XYG1, even when the third voltage Vs is applied to the sustain electrode, discharge starts due to the positive wall charges accumulated near the scan electrode and the negative wall charges accumulated near the sustain electrode. No sustain discharge is performed because the voltage cannot be reached. In the second display electrode line pair group XYG2, the third voltage Vs applied to the sustain electrode, the wall voltage caused by the negative wall charge accumulated near the scan electrode, and the positive wall charge accumulated near the sustain electrode Maintenance discharge is performed. By performing the sustain discharge, positive wall charges are accumulated near the scan electrodes, and negative wall charges are accumulated near the sustain electrodes. As a result, one sustain discharge is performed only in the second display electrode line pair group XYG2.

Next, in the common sustain period CS4, sustain discharge is commonly performed in the first display electrode line pair group XYG1 and the second display electrode line pair group XYG2. The total number of sustain discharges generated until the common sustain period CS4 is only one time for both the first display electrode line pair group XYG1 and the second display electrode line pair group XYG2. Since the gray scale weight value of the fourth subfield is 8, seven sustain discharges are performed in the common sustain period CS4.

In one sustain discharge in the common sustain period CS4, first, all the scan electrode lines Y1, ..., Yn have the third voltage Vs, and the sustain electrode lines X1, ..., Xn. ), The ground voltage Vg is applied, then the ground voltage Vg is applied to the scan electrode lines Y1, ..., Yn, and the third is applied to the sustain electrode lines X1, ..., Xn. Means a sustain discharge generated by applying the voltage (Vs).

First, while the third voltage Vs is applied to all the scan electrode lines Y1, ..., Yn, the ground voltage Vg is applied to the sustain electrode lines X1, ..., Xn. The ground voltage Vg is applied to the address electrode lines A1 through Am. Due to the wall voltage due to the positive wall charges accumulated near the scan electrodes inside the discharge cell, the wall voltage due to the negative wall charges accumulated near the sustain electrodes, and the third voltage Vs applied to the scan electrodes Discharge is initiated and sustain discharge is performed. By performing the sustain discharge, negative wall charges are accumulated near the scan electrodes, and positive wall charges are accumulated near the sustain electrodes.

Next, while the ground voltage Vg is applied to all the scan electrode lines Y1, ..., Yn, the third voltage Vs is applied to the sustain electrode lines X1, ..., Xn. The ground voltage Vg is applied to the address electrode lines A1, ..., Am. Due to the wall voltage caused by the negative wall charges accumulated near the scan electrodes in the discharge cells, the wall voltage caused by the positive wall charges accumulated near the sustain electrodes, and the third voltage Vs applied to the sustain electrodes. Discharge is initiated and sustain discharge is performed. By performing the sustain discharge, negative wall charges are accumulated near the scan electrodes, and positive wall charges are accumulated near the sustain electrodes.

One sustain discharge process is performed seven times in the fourth subfield SF4. Subfields other than the fourth subfield described above are also driven in the manner described above.

Meanwhile, the present invention has been described with respect to an embodiment in which the display electrode line pairs in which the scan electrode line and the sustain electrode line are paired into two groups to address each group and immediately perform the sustain discharge are not limited thereto. By grouping by the number it can be addressed for each group and the maintenance discharge is to be performed.

According to the present invention as described above, the following effects can be obtained.

First, grouping a pair of scan electrode lines and sustain electrode lines as a pair of display electrode lines, and sequentially performing addressing and sustain discharge for each group until the sustain discharge occurs after addressing than conventional ADS (Address Display Separation). As the standby time of the is reduced, the wall charge inside the discharge cell is less disturbed, so that stable maintenance discharge is performed. As the number of groups increases, the waiting time until the sustain discharge after different address discharges in each group becomes shorter and more stable sustain discharge can be performed.

Second, in the addressing for each group, that is, in the sustain period for each group after the address discharge, a large amount of negative wall charges accumulated in the scan electrode lines of the group of display electrode line pairs other than the addressing group are stored in the negative fourth voltage ( By using Vnf), the internal wall charge states of the discharge cells corresponding to the group to be addressed can be evenly distributed so that stable addressing, that is, address discharge, can be performed.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (6)

For a plasma display panel in which display electrode line pairs, which are pairs of sustain electrode lines and scan electrode lines, are formed side by side, and address electrode lines are formed to be spaced apart from and intersect with the display electrode line pairs, a plurality of subfields are formed in a unit frame. The subfields have a reset period, a mixed drive period, and a correction sustain period, and the display electrode line pairs are driven by grouping two or more display electrode line pair groups. In the driving method of the plasma display panel, The mixed driving period may include two or more group address periods in which addressing is sequentially performed for each of the display electrode line pair groups; And one or more group sustain periods in which sustain discharge is performed on addressed display electrode line pair groups between the group address periods. In the group address periods, a first voltage is applied to the scan electrode lines of each display electrode line pair group, and a scan pulse having a second voltage is sequentially applied to the display electrode line pair group for addressing. In the group sustain periods, a third voltage and a ground voltage are sequentially applied to all scan electrode lines, and a negative polarity is applied to scan electrode lines of a group of display electrode line pairs that are not addressed in the group address periods. 4 is a driving method of the plasma display panel, characterized in that further voltage is applied. The method of claim 1, In the group address periods, a display data signal having a fifth voltage is applied to the address electrode lines according to the scan pulse, and the sixth voltage is applied to all the sustain electrode lines. And the ground voltage and the third voltage are sequentially applied to all of the sustain electrode lines in the group sustain periods. The method of claim 2, wherein the correction holding period, A selective sustain period in which sustain discharge is selectively performed on the display electrode line pair groups so that the number of sustain discharges in all the display electrode line pair groups coincides with the gray scale weight value of each subfield; And a common sustain period in which sustain discharge is commonly performed for all of the display electrode line pair groups. The method of claim 3, wherein the reset period, A third voltage is applied to all the scan electrode lines, a rising ramp signal is applied at the third voltage to reach an eighth voltage that is finally raised by a seventh voltage, and a falling ramp signal is applied at the third voltage. Finally, a fourth voltage is reached, a sixth voltage is applied to all the sustain electrode lines when the falling ramp signal is applied, and a ground voltage is applied to all the address electrode lines. Driving method. The method of claim 4, wherein In the selection retention period, In order to equalize the number of sustain discharges per display electrode line pair group, the ground voltage and the third voltage are sequentially applied to all sustain electrode lines, and scanning of the display electrode line pair group in which sustain discharge is not required is performed. The ninth voltage and the ground voltage are sequentially applied to the electrode lines, and the third voltage and the ground voltage are sequentially applied to the scan electrode lines of the display electrode line pair group to which sustain discharge is further performed. In the common maintenance period, And a sustain pulse having the third voltage and the ground voltage is alternately applied to all of the scan electrode lines and the sustain electrode lines. The method of claim 5, wherein the ninth voltage is, And a method smaller than that of the third voltage.

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