KR20060091203A - Driving apparatus and method for plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to an apparatus for driving a plasma display panel that improves the image quality of a plasma display panel by improving the arrangement of subfields to reduce the occurrence of flicker. And to a method.

The driving apparatus of the plasma display panel of the present invention for achieving the above object includes an address electrode, a scan electrode and a sustain of a plasma display panel which express an image in a frame composed of a combination of a plurality of subfields in a reset period, an address period and a sustain period. A plasma display panel driving apparatus including a data driver, a scan driver, a sustain driver, and a timing controller for applying a driving pulse to an electrode, wherein the frame is divided into two subfield groups including at least one subfield, At least one rest period having a predetermined length is characterized in that it is included.

Plasma Display Panel, Flicker, Subfield, Picture, PAL

Description

Driving apparatus and method for plasma display panel {Driving Apparatus and Method for Plasma Display Panel}

1 is a diagram showing the structure of a typical plasma display panel.

2 is a diagram illustrating a method of implementing image gradation of a conventional plasma display panel.

3 is a view illustrating a driving waveform according to a driving method of a conventional plasma display panel.

4 is a diagram for explaining an arrangement of subfields for implementing an image of a plasma display panel in a conventional PAL method.

5 is a view for explaining a driving device of the plasma display panel of the present invention;

6 is a diagram for conceptually explaining APL.

7A to 7B are views for explaining an embodiment of a method of driving a plasma display panel of the present invention.

8A to 8B are views for explaining another embodiment of the method for driving the plasma display panel of the present invention.

9A to 9B are views for explaining another embodiment of the method for driving the plasma display panel of the present invention.

10A to 10B illustrate another embodiment of a method of driving a plasma display panel of the present invention.

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

500: APL calculation unit 501: image correction unit

502: subfield mapping unit 503: data alignment unit

504: Timing controller 505: Data driver

506: scan driver 507: sustain driver

508: panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to an apparatus for driving a plasma display panel that improves the image quality of a plasma display panel by improving the arrangement of subfields to reduce the occurrence of flicker. And to a method.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert 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.

1 illustrates a structure of a general plasma display panel.

As shown in FIG. 1, a plasma display panel includes a front panel in which a plurality of sustain electrode pairs formed by pairing a scan electrode 102 and a sustain electrode 103 are arranged on a front glass 101 that is a display surface on which an image is displayed. The rear panel 110 on which the plurality of address electrodes 113 are arranged so as to intersect the plurality of sustain electrode pairs on the back glass 111 forming the back surface 100 and the rear surface is coupled in parallel with a predetermined distance therebetween. .

The front panel 100 is made of a scan electrode 102 and a sustain electrode 103, that is, a transparent electrode (a) formed of a transparent ITO material and a metal material to mutually discharge and maintain light emission of the cells in one discharge cell. The scan electrode 102 and the sustain electrode 103 provided as the bus electrode b are included in pairs. The scan electrode 102 and the sustain electrode 103 are covered by one or more upper dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and to facilitate the discharge conditions on the upper dielectric layer 104 top surface. A protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

The rear panel 110 is arranged such that a plurality of discharge spaces, that is, barrier ribs 112 of a stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 113 which perform address discharge to generate vacuum ultraviolet rays are arranged in parallel with the partition wall 112. On the upper side of the rear panel 110, R, G, and B phosphors 114 which emit visible light for image display during address discharge are coated. A lower dielectric layer 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113.

A method of implementing image gradation in such a plasma display panel is shown in FIG. 2.

2 is a diagram illustrating a method of implementing image grayscale of a conventional plasma display panel.

As shown in FIG. 2, in the conventional method of expressing a gray level of a plasma display panel, a frame is divided into several subfields having different number of emission times, and each subfield is a reset period (RPD) for initializing all cells again. ) Is divided into an address period APD for selecting a cell to be discharged and a sustain period SPD for implementing gradation according to the number of discharges. For example, when displaying an image with 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. 2, and eight subfields. Each of the SFs SF1 to SF8 is divided into a reset period, an address period, and a sustain period.

The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting the cell to be discharged is caused by the voltage difference between the address electrode and the transparent electrode which is the scan electrode. The sustain period is increased at a rate of 2 ⁿ ( ^where n = 0, 1, 2, 3, 4, 5, 6, 7) in each subfield. In this way, since the sustain period is different in each subfield, the gray scale of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges. The driving waveforms according to the driving method of the plasma display panel are shown in FIG. 3.

3 is a view illustrating a driving waveform according to a driving method of a conventional plasma display panel.

As shown in Fig. 3, the plasma display panel erases the reset period for initializing all the cells, the address period for selecting the cells to be discharged, the sustain period for maintaining the discharge of the selected cells, and the wall charges in the discharged cells. It is divided into an erase period for driving.

In the reset period, the rising ramp waveform Ramp-up is applied to all the scan electrodes at the same time in the setup period. This rising ramp waveform causes weak dark discharge within the full discharge cells. By this setup discharge, positive wall charges are accumulated on the address electrode and the sustain electrode, and negative wall charges are accumulated on the scan electrode.

During the set-down period, after the rising ramp waveform is supplied, the falling ramp waveform (Ramp-down) starts to fall from the positive voltage lower than the peak voltage of the rising ramp waveform and falls to a specific voltage level below the ground (GND) level voltage. By generating a weak erase discharge in the inside, the wall charges excessively formed in the scan electrode are sufficiently erased. By this set-down discharge, wall charges such that the address discharge can stably occur remain uniformly in the cells.

In the address period, the negative scan pulses are sequentially applied to the scan electrodes, and the positive data pulses are applied to the address electrodes in synchronization with the scan pulses. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, address discharge is generated in the discharge cell to which the data pulse is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied. The sustain electrode is supplied with a positive polarity voltage Vz during the set down period and the address period so as to reduce the voltage difference with the scan electrode so as to prevent mis-discharge with the scan electrode.

In the sustain period, a sustain pulse Su is applied to the scan electrode and the sustain electrodes alternately. In the cell selected by the address discharge, as the wall voltage and the sustain pulse in the cell are added, a sustain discharge, that is, a display discharge, occurs between the scan electrode and the sustain electrode every time the sustain pulse is applied.

After the sustain discharge is completed, in the erase period, a voltage of an erase ramp waveform Ramp-ers having a small pulse width and a low voltage level is supplied to the sustain electrode to erase the wall charge remaining in the cells of the full screen.

In the plasma display panel driven by such a driving waveform, flickering, that is, flicker, generally occurs.

Such flicker generally occurs when the afterglow time of the phosphor is shorter than the vertical frequency (frame frequency) of the image signal. For example, assuming that the vertical frequency is 60 Hz, an image of one frame is displayed per 16.67 m / sec, and the response speed of the phosphor is faster than this, causing flickering, or flickering of the screen.

In particular, the PAL (Phase Alternating Line) method, which is adopted as a European TV standard, has a problem in that the vertical frequency is relatively short, such as 50 Hz, so that the generation of flicker is further intensified.

In the PAL scheme, the problem of the above-described flicker is attempted by setting the arrangement of subfields in one frame in two stages.

The arrangement of the subfields in the PAL method is as shown in FIG. 4.

4 is a view for explaining an arrangement of subfields for implementing an image of a plasma display panel in a conventional PAL method.

Referring to FIG. 4, in the conventional PAL scheme, subfields having different weights are arranged into two groups in one frame. For example, as shown in FIG. 4, the first subfield group includes a subfield of weight 1, a subfield of weight 8, a subfield of weight 16, a subfield of weight 32, and a subfield of weight 64.

In addition, the second subfield group includes a subfield of weight 2, a subfield of weight 4, two subfields of weight 8, a subfield of weight 16, a subfield of weight 32, and a subfield of weight 64.

As such, the sum of the weights of the subfields in one arranged frame is 1 + 2 + 4 + 8 + (8 + 8) + (16 + 16) + (32 + 32) + (64 + 64), 255. As a result, 256 gray levels can be realized.

As described above, in the method of realizing an image by dividing the subfields into two groups within one frame, there is a problem that it is difficult to prevent flicker caused by the change of the average picture level (APL).

An object of the present invention is to provide an apparatus and method for driving a plasma display panel which improves the arrangement of subfields in one frame to reduce flicker caused by a change in average picture level (APL). There is this.

The driving apparatus of the plasma display panel of the present invention for achieving the above object includes an address electrode, a scan electrode and a sustain of a plasma display panel which express an image in a frame composed of a combination of a plurality of subfields in a reset period, an address period and a sustain period. A plasma display panel driving apparatus including a data driver, a scan driver, a sustain driver, and a timing controller for applying a driving pulse to an electrode, wherein the frame is divided into two subfield groups including at least one subfield, At least one rest period having a predetermined length is characterized in that it is included.

In this case, the above-mentioned idle period is one and is characterized by being included between two subfield groups.

In addition, the pause period is two, characterized in that it is included between the two sub-field group, and the front end of the preceding sub-field of the two sub-field, respectively.

In addition, the length of the pause period is characterized by varying according to the average picture level (APL) value of the frame.

In addition, the length of the pause period may be reduced as the average picture level (APL) value of the frame increases.

In addition, the two subfield groups may each include a plurality of subfields.

In addition, the two subfield groups are characterized in that the subfields in each group are arranged in the order of the weight.

In addition, the two subfield groups are characterized in that the subfields in each group are arranged in increasing order of the weight.

In addition, the two subfield groups are characterized in that the subfields in each group are arranged in order of decreasing magnitude of the weight.

In addition, the driving method of the plasma display panel according to the present invention for achieving the above object is a frame comprising a combination of a plurality of subfields to which a driving pulse is applied to an address electrode, a scan electrode and a sustain electrode in a reset period, an address period and a sustain period. A method of driving a plasma display panel representing an image, the method comprising: dividing a frame into two subfield groups including at least one subfield, and including at least one rest period having a predetermined length in the frame. do.

In addition, the pause period is one, characterized in that included between the two sub-field group.

In addition, the pause period is two, characterized in that it is included between the two sub-field group, and the front end of the preceding sub-field of the two sub-field, respectively.

In addition, the length of the pause period is characterized by varying according to the average picture level (APL) value of the frame.

In addition, the length of the pause period may be reduced as the average picture level (APL) value of the frame increases.

In addition, the two subfield groups may each include a plurality of subfields.

In addition, the two subfield groups are characterized in that the subfields in each group are arranged in the order of the weight.

In addition, the two subfield groups are characterized in that the subfields in each group are arranged in increasing order of the weight.

In addition, the two subfield groups are characterized in that the subfields in each group are arranged in order of decreasing magnitude of the weight.

Hereinafter, exemplary embodiments of a driving apparatus and method of a plasma display panel of the present invention will be described in detail with reference to the accompanying drawings.

5 is a view for explaining a driving apparatus of the plasma display panel of the present invention.

As shown in FIG. 5, the driving apparatus of the plasma display panel according to the present invention includes an APL calculator 500, an image corrector 501, a subfield mapping unit 502, a data alignment unit 503, and a timing controller 504. ), A data driver 505, a scan driver 506, and a sustain driver 507.

Here, the APL calculator 500 calculates an APL (Average Picture Level) value of image data for each frame input from the outside.

The image corrector 501 processes the image data according to the APL value calculated by the APL calculator 500 described above.

The subfield mapping unit 502 maps the image data processed by the image correction unit 501 to subfields under the control of the timing controller 504.

The data alignment unit 503 aligns the subfield mapping data input from the above-described subfield mapping unit 502 to each of the address electrodes X ₁ to X _n .

The data driver 505 applies the data pulses of the aligned data to the address electrodes X ₁ to X _n of the plasma display panel 508.

The timing controller 504 controls the pulse timing of the data driver 505, the scan driver 506, and the sustain driver 507 according to the APL value calculated by the APL calculator 500 described above.

The scan driver 506 applies a scan pulse and a sustain pulse to each scan electrode Y ₁ to Y _m .

The sustain driver 507 applies a sustain pulse to each sustain electrode Z. Through this operation, the plasma display panel 508 is driven.

As described above, the driving apparatus of the plasma display panel of the present invention divides a frame into two subfield groups including at least one or more subfields, and includes at least one or more pieces having a predetermined length in the frames divided into the subfield groups. Adjust to include rest period. That is, in the driving apparatus of the plasma display panel of the present invention, the timing controller 504 uses the data driver 505, the scan driver 506, and the sustain driver 507 according to the APL value calculated by the APL calculator 500. As described above, the frame is divided into two subfield groups including at least one subfield, and the frame divided into the subfield groups is adjusted to include at least one idle period having a predetermined length. The reason why the idle period is included in the frame is to obtain the effect that one frame operates as two frames. For example, assume that there is one frame including 10 subfields. Here, if 10 subfields are arranged consecutively, one frame having 10 subfields is implemented. However, if the previous 5 subfields and the following 5 subfields are arranged with one pause period, 5 subfields are implemented. One frame having a field and another five frames, that is, two frames having five subfields can be obtained. As a result, the vertical frequency of the image can be doubled.

On the other hand, screen flicker and flicker is a phenomenon that occurs when the afterglow time of the phosphor is shorter than the vertical frequency (frame frequency) of the image signal as described above. Considering the cause of flicker, flicker occurs due to the effect that the vertical frequency of the image signal is longer than the afterglow time of the phosphor because the vertical frequency is increased by the effect of two frames in one frame. This is to be reduced.

Here, the above-mentioned idle period is one, and may be included between two subfield groups, or the above-mentioned idle period is two, and may be included between two subfield groups and at the front of the preceding subfield among the two subfields, respectively. have. The number and inclusion positions of these rest periods will be described in more detail later.

Alternatively, two subfield groups each include a plurality of subfields. Of course, at least one of the two subfield groups may include one subfield.

In addition, the two subfield groups are arranged in the order of the magnitude of the weight of the subfields in each group, for example, the two subfield groups are arranged in the order of increasing the magnitude of the weight of the subfields in each group. That is, the subfield having the lowest weight of the subfield is located at the beginning of the frame, and the subfield having a higher weight is located later.

In addition, the two subfield groups may be arranged in the order in which the subfields in each group are reduced in magnitude.

In addition, the length of the pause period is varied according to the average picture level (APL) value of the frame. For example, the length of the pause period decreases as the average picture level (APL) value of the frame increases. As such, referring to FIG. 6, the above-described APL is described as follows to help understand the length of the leave of absence variable according to the APL of the frame.

6 is a diagram for conceptually describing APL.

Referring to Fig. 6, the number of sustain pulses increases as the average image level decreases. That is, the number of sustain pulses increases as the power reaches maximum (peak luminance, average image level is minimum, display area minimum). In contrast, as the average image level increases, that is, the number of sustain pulses decreases as the power reaches the lowest (lowest luminance, maximum average image level, maximum display area). According to this APL value, the length of the above-mentioned idle period is variable. Preferably, the length of the pause period decreases as the APL value of the frame increases. In other words, the number of sustain pulses decreases, and the length of the rest period increases as the size of one sustain pulse increases. As such, the reason for decreasing the length of the rest period as the APL value decreases is that the luminance realized because the magnitude of one sustain pulse increases. As a result, the luminance realized in one frame increases, and thus the light duration is long, so that it is increasingly difficult to obtain the effect of two frames in one frame. In other words, assuming that one frame is divided into two subfield groups, each subfield group must implement a discontinuous image. When the APL decreases and the size of one sustain pulse increases, the light duration increases. This is because the pictures implemented in each subfield group are not discontinuous but can be continuously implemented. Accordingly, as the APL decreases, the length of the rest period increases.

As described above, a method of driving the plasma display panel by including a pause period in one frame will be described with reference to FIGS. 7A to 7B.

7A to 7B are views for explaining an embodiment of a method of driving a plasma display panel of the present invention.

First, referring to FIG. 7A, the idle period is one and is included between two subfield groups. For example, as shown in FIG. 7A, one frame is divided into two subfield groups, that is, the first subfield group and the second subfield group, and the screen is divided between the first subfield group and the second subfield group. Rest periods to prevent tremor, ie flicker, are included.

Here, the subfields are arranged in increasing order of the weight in each group, that is, the first subfield group and the second subfield group. That is, the subfield having the lowest weight of the subfield is located at the beginning of the frame, and the subfield having a higher weight is located later. For example, the first subfield group includes a subfield of weight 1, a subfield of weight 8, a subfield of weight 16, a subfield of weight 32, and a subfield of weight 64 in this order.

In addition, the second subfield group includes a subfield having a weight of 2, a subfield having a weight of 4, two subfields having a weight of 8, a subfield having a weight of 16, a subfield having a weight of 32, and a subfield having a weight of 64 in this order. .

As such, the sum of the weights of the subfields in one arranged frame is 1 + 2 + 4 + 8 + (8 + 8) + (16 + 16) + (32 + 32) + (64 + 64), 255. As a result, 256 gray levels as shown in the frame of FIG. 2 in which subfields having weights of 1, 2, 4, 8, 16, 32, 64, and 128 are sequentially arranged may be implemented. In addition, the first subfield group that can implement 121 gradations and the second subfield group that can implement 135 gradations may include effects of two frames implementing gradations of 121 and 135. As a result, the generation of flicker is reduced. The concept of the weight of the subfield in one frame and the concept of the rest period are shown in FIG. 7B.

Referring to FIG. 7B, two subfield groups, that is, a first subfield group and a second subfield group, are included in one frame, and a pause is included between these subfield groups. Note that the triangular shape represents the weights of the subfields included in each subfield group. This means that the subfields are arranged in increasing order of the weight in each subfield.

7A to 7B have been illustrated and described in which subfields are arranged in increasing order of weights within one frame, it is also possible to arrange them in decreasing order of weights. Same as

8A to 8B are views for explaining another embodiment of the method of driving the plasma display panel of the present invention.

First, referring to FIG. 8A, the subfields are arranged in decreasing order of the weight in each group, that is, the first subfield group and the second subfield group. That is, the subfield having the highest weight of the subfield is located at the beginning of the frame, and the subfield having a lower weight gradually is located later. For example, the first subfield group includes a subfield of weight 64, a subfield of weight 32, a subfield of weight 16, a subfield of weight 8, and a subfield of weight 1.

In addition, the second subfield group includes a subfield with a weight of 64, a subfield with a weight of 32, a subfield with a weight of 16, two subfields with a weight of 8, a subfield with a weight of 4, and a subfield with a weight of 2 in this order. . The concept of the weight of the subfield in one frame and the concept of the rest period are shown in FIG. 8B.

Referring to FIG. 8B, two subfield groups, that is, a first subfield group and a second subfield group, are included in one frame, and a pause is included between these subfield groups. Note that the triangular shape represents the weights of the subfields included in each subfield group. This means that the subfields are arranged in decreasing order of the weight in each subfield.

In the above, only one pause period is included and illustrated in one frame, but alternatively, two pause periods may be included in one frame, which will be described with reference to FIGS.

9A to 9B are views for explaining still another embodiment of a method of driving a plasma display panel of the present invention.

First, referring to FIG. 9A, FIG. 9A includes two pause periods in one frame, and this pause period is included between two subfield groups and the front end of the preceding subfield among the two subfields. Also, within each subfield group, the subfields are arranged in increasing weight.

9A is different from each other in that two pause periods are included in one frame compared to FIG. 7A, and the rest are basically identical to each other. Accordingly, further description will be omitted.

This concept of Figure 9a is shown in Figure 9b.

Referring to FIG. 9B, two subfield groups, that is, a first subfield group and a second subfield group, are included in one frame, and a pause is included between the subfield groups and the front end of the first subfield, respectively. . That is, two idle periods are included in one frame. Note that the triangular shape represents the weights of the subfields included in each subfield group. This means that the subfields are arranged in increasing order of the weight in each subfield.

10A to 10B are diagrams for describing another embodiment of the method of driving the plasma display panel of the present invention.

First, referring to FIG. 10A, FIG. 10A includes two pause periods in one frame, and the pause period is included between two subfield groups and the front end of the preceding subfield among the two subfields. In addition, in each subfield group, subfields are arranged in order of decreasing weight.

10A differs from each other in that two pause periods are included in one frame, and the rest are basically the same as in FIG. 8A. Accordingly, further description will be omitted.

This concept of Figure 10a is shown in Figure 10b.

Referring to FIG. 10B, two subfield groups, that is, a first subfield group and a second subfield group, are included in one frame, and a pause is included between these subfield groups and the front end of the first subfield, respectively. . That is, two idle periods are included in one frame. Note that the triangular shape represents the weights of the subfields included in each subfield group. This means that the subfields are arranged in decreasing order of the weight in each subfield.

By subdividing the subfields into two groups in one frame, and inserting a rest period having a variable length according to the APL value in the frame divided by the subfield groups, according to the change of APL (Average Picture Level) Improve flicker that occurs.

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 in detail above, the apparatus and method for driving the plasma display panel of the present invention divides one frame into two subfield groups, and at least one idle period variable according to the APL value in the frame divided into the subfield groups. By including the above, there is an effect of preventing the screen shake, that is, flicker.

Claims (18)

A data driver, a scan driver, a sustain driver, which applies a driving pulse to an address electrode, a scan electrode, and a sustain electrode of a plasma display panel expressing an image in a frame composed of a combination of a plurality of subfields in a reset period, an address period, and a sustain period; In the driving apparatus of the plasma display panel including a timing controller, Divide the frame into two subfield groups comprising at least one subfield, And at least one rest period having a predetermined length in the frame. The method of claim 1, The rest period is one, And a plasma display panel included between the two subfield groups. The method of claim 1, The rest period is two, And between the two subfield groups and at a front end of a preceding subfield among the two subfields. The method according to any one of claims 1 to 3, The length of the idle period is variable according to the average picture level (APL) value of the frame. The method of claim 4, wherein And the length of the pause period decreases as the average picture level (APL) value of the frame increases. The method according to any one of claims 1 to 3, The two subfield groups each includes a plurality of subfields. The method of claim 6, The two subfield groups The sub-fields of the plasma display panel driving apparatus, characterized in that arranged in the order of the magnitude of the weight. The method of claim 7, wherein The two subfield groups The subfields of the plasma display panel are arranged in increasing order of weight in each group. The method of claim 7, wherein The two subfield groups The subfields of the plasma display panel are arranged in the order of decreasing magnitude of the weight in each group. A driving method of a plasma display panel in which an image is represented by a frame consisting of a combination of a plurality of subfields in which a driving pulse is applied to an address electrode, a scan electrode, and a sustain electrode in a reset period, an address period, and a sustain period. Divide the frame into two subfield groups comprising at least one subfield, And at least one rest period having a predetermined length in the frame. The method of claim 10, The rest period is one, And a plasma display panel included between the two subfield groups. The method of claim 10, The rest period is two, And between the two subfield groups and at a front end of a preceding subfield among the two subfields. The method according to any one of claims 10 to 12, The length of the pause period is variable according to the average picture level (APL) value of the frame. The method of claim 13, And the length of the pause period decreases as the average picture level (APL) value of the frame increases. The method according to any one of claims 10 to 12, And the two subfield groups each include a plurality of subfields. The method of claim 15, The two subfield groups A method of driving a plasma display panel, wherein subfields are arranged in order of weight in each group. The method of claim 16, The two subfield groups A method of driving a plasma display panel, wherein subfields are arranged in increasing order of weights in each group. The method of claim 16, The two subfield groups A method of driving a plasma display panel, wherein subfields are arranged in decreasing order of weight in each group.

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