KR20070066355A - Plasma display apparatus - Google Patents

Abstract

A plasma display apparatus is provided to suppress an erroneous discharge by adjusting the number of reset pulses according to driving time of a plasma display panel. A plasma display apparatus includes a plasma display panel(100) and a driver(104). The plasma display panel includes sustain electrodes. The driver supplies a first number of reset pulses in a low gray scale sub-field of a frame, when the total driving time of the plasma display panel is a first time, to the sustain electrodes during a reset period for an initialization, and supplies a second number of reset pulses which are larger than the first number, in a second time which is longer than the first time.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

1 is a view for explaining a plasma display device of the present invention.

2A to 2B are diagrams for explaining an example of a plasma display panel included in the plasma display device of the present invention.

3 is a view for explaining an example of the operation of the plasma display device of the present invention;

4A to 4B are views for explaining in more detail the operation of the driver in the reset period.

5 is a view for explaining an example of a method of increasing the number of reset pulses supplied to a sustain electrode in a predetermined subfield among a plurality of subfields of a frame.

Fig. 6 is a diagram for explaining another example of the operation of the driving unit in the reset period.

FIG. 7 is a diagram for explaining an example of a method for securing a driving time when the number of reset pulses increases. FIG.

Fig. 8 is a diagram for explaining in detail the scan pulses supplied in the address period.

9 illustrates an example of a method for supplying one or more reset pulses between two consecutive frames.

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

100: plasma display panel 101: data driver

102: scan driver 103: sustain driver

104: drive part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device (Plasma Display Apparatus) in which a reset pulse supplied to a sustain electrode in a reset period is improved.

In general, the plasma display apparatus includes a plasma display panel in which a plurality of electrodes are formed and a driving unit for driving the electrodes of the plasma display panel.

Here, in the plasma display panel, a partition wall formed between the front panel and the rear panel forms a discharge cell. In the discharge cell, neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and a small amount of 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 plasma display panel is supplied with a driving voltage for generating a discharge, and discharges such as reset discharge, address discharge, and sustain discharge are generated by the driving voltage, thereby displaying an image.

These discharges each have unique discharge characteristics.

For example, a voltage of at least 180V must be supplied for sustain discharge to occur. That is, the discharge start voltage of the sustain discharge is 180V. In addition, in the address discharge, wall charges sufficient to cause a discharge by the sustain pulse supplied in the subsequent sustain period should be formed in the discharge cell.

On the other hand, when the driving time of the plasma display panel is continuously increased, the discharge characteristics such as the discharge start voltage for generating the discharge may be changed.

This causes a problem that the discharge becomes unstable. Even discharge occurs due to discharge occurring within the discharge cell to be discharged or discharge occurring within the discharge cell in which discharge should not occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display apparatus capable of stabilizing discharge even when discharge characteristics change, such as a change in discharge start voltage for generating a discharge.

The plasma display device according to the present invention for achieving the above object is a low gray scale subfield among a plurality of subfields included in a frame when the plasma display panel having the sustain electrode and the total driving time of the plasma display panel is the first time. The driving unit for supplying a first number of reset pulses to the sustain electrode in the reset period for initialization, and supplies a second number of reset pulses more than the first number when the first time and the second time longer than the first number. It is preferable to include.

The low gray level subfield may be at least one subfield among the subfields up to the third subfield in order of increasing gray level weight among the plurality of subfields included in the frame. It features.

The second number may be two or more and three or less.

The driving unit supplies a scan pulse of a first width to the sustain electrode in an address period after a reset period in one or more subfields of the plurality of subfields included in the frame when the first time is reached. In the case of 2 hours, a scan pulse of a second width narrower than the first width is supplied.

In addition, the difference between the first width and the second width is characterized in that less than 10 microseconds (microseconds) 100 microseconds (microseconds).

In addition, the difference between the first width and the second width is characterized in that approximately 80 microseconds (microseconds).

In the second time period, the driver maintains the sustain period in a period from the sustain period of the subfield having the highest gray scale weight among the plurality of subfields of the frame to before the reset period of the first subfield of the frame. A third number of reset pulses is supplied to the electrode.

The third number may be one or more and four or less.

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

1 is a view for explaining a plasma display device of the present invention.

Referring to FIG. 1, the plasma display apparatus of the present invention includes a plasma display panel 100 and a driver 104.

The driver 100 preferably includes a data driver 101, a scan driver 102, and a sustain driver 103 according to electrodes formed on the plasma display panel 100.

Here, an example of the plasma display panel will be described with reference to FIGS. 2A to 2B.

2A to 2B are views for explaining an example of the plasma display panel included in the plasma display device of the present invention.

First, referring to FIG. 2A, the plasma display panel includes a front panel 200 having a storage electrode 202 formed on a front substrate 201, which is a display surface on which an image is displayed, and a storage electrode (described above) on a rear substrate 211. The rear panel 210 having the address electrode 213 formed to intersect the 202 is coupled side by side with a predetermined distance therebetween.

The front panel 200 includes a plurality of sustain electrodes 202 for discharging each other in a discharge space, that is, a discharge cell and maintaining light emission of the discharge cell.

The sustain electrode 202 is covered by one or more top dielectric layers 203 that limit the discharge current and insulate the electrode pairs, and a protective layer 204 on the top of the top dielectric layer 203 to facilitate discharge conditions. ) Is formed.

The protective layer 204 is formed through a method of depositing a material such as magnesium oxide (MgO) over the upper dielectric layer 203.

The rear panel 210 includes a plurality of discharge spaces, that is, barrier ribs 212 of stripe type (or well type) for partitioning the discharge cells. In addition, a plurality of address electrodes 213 are provided for supplying data pulses.

Here, in the discharge cells partitioned by the partition walls, the phosphor layer 214 that emits visible light for image display upon address discharge, preferably red (R), green (G), and blue (Blue :) B) a phosphor layer is formed.

A lower dielectric layer 215 is formed between the address electrode 213 and the phosphor layer 214 to insulate the address electrode 213.

Here, the sustain electrode 202 will be described in more detail with reference to FIG. 2B.

Here, in FIG. 2B, the sustain electrode 202 is formed between the front substrate 201 and the upper dielectric layer 203 as in region A of FIG. 2A.

Referring to FIG. 2B, the sustain electrode 202 of the plasma display panel of the present invention may include a scan electrode 202Y and a sustain electrode 202Z.

The scan electrode 202Y and the sustain electrode 202Z are formed to generate surface discharge. The transparent electrode 202Ya is formed of a transparent ITO material to emit light generated in the discharge cell to the outside and to secure driving efficiency. , 202Za and bus electrodes 202Yb and 202Zb made of an opaque metal material.

As such, the reason why the scan electrode 202Y and the sustain electrode 202Z include the transparent electrodes 202Ya and 202Za is to allow the visible light generated in the discharge cells to be effectively emitted when emitted to the outside of the plasma display panel. For that.

In addition, the reason why the scan electrode 202Y and the sustain electrode 202Z include the bus electrodes 202Yb and 202Zb is that the scan electrode 202Y and the sustain electrode 202Z include only the transparent electrodes 202Ya and 202Za. In this case, the driving efficiency can be reduced because the electrical conductivity of the transparent electrodes 202Ya and 202Za is relatively low, so as to compensate for the low electrical conductivity of the transparent electrodes 202Ya and 202Za which can cause such a reduction in the driving efficiency. to be.

2A to 2B, only one example of the plasma display panel of the present invention is shown and described, and the present invention is not limited to the plasma display panel having the structure of FIGS. 2A to 2B. For example, although only the case where the upper dielectric layer 203 and the lower dielectric layer 215 are one layer is illustrated, at least one or more of the upper dielectric layer 203 and the lower dielectric layer 215 may be a plurality of layers. It is also possible to form a layer of.

That is, the plasma display panel that can be applied to the plasma display device of the present invention includes the sustain electrode 202, more preferably the sustain electrode 202 including the scan electrode 202Y and the sustain electrode 202Z as shown in FIG. 2B. This is formed, and other conditions are acceptable.

Next, the description of FIG. 2A to FIG. 2B will be finished, and FIG. 1 will be described again.

The driver 104 supplies a reset pulse to the sustain electrode, preferably the scan electrode Y, of the plasma display panel in the reset period for initialization. In addition, when the total driving time of the plasma display panel is the first time, for example, less than 1000 hours, the first number of reset pulses is supplied from the low gray level subfield among the plurality of subfields included in the frame. In the case of the second time longer than 1 hour, for example, 1000 hours or more, a second number of reset pulses larger than the first number is supplied.

More preferably, the scan driver 102 of the driver 104 supplies the first number of reset pulses and the second number of reset pulses to the scan electrode Y.

Here, the data driver 101 included in the driver 104 may apply a predetermined driving voltage to the address electrode X formed in the plasma display panel.

Such a plasma display apparatus of the present invention, in addition to applying the first number of reset pulses and the second number of reset pulses to the sustain electrode, preferably the scan electrode Y in the sustain period, scan electrode Y in the address period. A scan pulse of the negative scan voltage (-Vy) is applied to the scan electrode (Y), and a sustain pulse is applied to the sustain electrode, preferably the scan electrode (Y) and / or the sustain electrode (Z) in the sustain period. It is possible to perform various operations such as applying.

An example of the operation of the plasma display apparatus of the present invention will be described with reference to FIG. 3.

3 is a view for explaining an example of the operation of the plasma display device of the present invention in detail.

Referring to FIG. 3, in the plasma display device of the present invention, the driver 104, preferably the scan driver 102, supplies a reset pulse to the sustain electrode, preferably the scan electrode Y in the reset period.

This reset pulse includes a ramp-up waveform in the setup period and a ramp-down waveform in the set-down period.

Here, when the reset pulse is supplied, first, a weak dark discharge, that is, a set-up discharge occurs in the discharge cell by the rising ramp waveform. This setup discharge causes a certain amount of wall charges to accumulate in the discharge cell.

In addition, after the discharge by the rising ramp waveform, a weak erase discharge, that is, a set-down discharge, occurs by the ramp-down waveform. This set-down discharge erases a part of the wall charges accumulated in the discharge cell by the previous setup discharge, and the wall charges such that the address discharge can be stably generated in the discharge cell remain uniformly.

In this reset period, the number of reset pulses supplied to the sustain electrode, preferably the scan electrode Y may vary according to the total driving time of the plasma display panel. For example, as the total driving time of the plasma display panel increases, the number of reset pulses supplied to the sustain electrode, preferably the scan electrode Y, increases. This will be described in more detail later with reference to FIGS. 4A to 4B.

In the address period after the reset period, the scan reference voltage Vsc and the voltage (-Vy) of the negative scan pulse Scan falling from the scan reference voltage Vsc may be applied to the scan electrode Y. . Preferably, the scan driver 102 applies the scan reference voltage Vsc and the voltage of the negative scan pulse (-Vy).

In addition, when the voltage (-Vy) of the negative scan pulse is applied to the scan electrode Y, the voltage Vd of the data pulse may be supplied to the address electrode X correspondingly. Preferably, the data driver 101 applies the voltage Vd of the data pulse.

In addition, the sustain driver 103 may apply a predetermined sustain bias voltage Vzb to the sustain electrode Z in the address period in order to prevent the occurrence of an erroneous discharge due to the interference of the sustain electrode Z in the address period.

In the address period, the voltage difference between the voltage of the negative scan pulse (-Vy) and the voltage of the data pulse (Vd) and the wall voltage caused by the wall charges generated in the reset period are added to the voltage Vd of the data pulse. An address discharge is generated in the discharge cell applied.

In such a discharge cell selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs of the sustain pulse is applied.

In the sustain period after the address period, the driving unit 104 applies a sustain pulse SUS to the sustain electrode, that is, the scan electrode Y and / or the sustain electrode Z. FIG.

Here, when the sustain pulse SUS is supplied to the scan electrode Y and / or the sustain electrode Z, the discharge cell selected by the address discharge is the wall voltage in the discharge cell and the sustain voltage Vs of the sustain pulse SUS. ) Is added and sustain discharge, that is, display discharge, occurs between the scan electrode Y and the sustain electrode Z every time the sustain pulse SUS is applied. Accordingly, a predetermined image is implemented on the plasma display panel.

Here, the operation of the driving unit in the above-described reset period will be described in more detail.

4A to 4B are diagrams for explaining in more detail the operation of the driver in the reset period.

First, referring to FIG. 4A, (a) shows a reset pulse when the total driving time of the plasma display panel is the first time, and (b) shows a reset pulse when the total driving time of the plasma display panel is the second time. Is shown.

Comparing the reset pulses of (a) and (b), when the total driving time of the plasma display panel is the first time, only the first number of reset pulses, that is, one reset pulse (first reset pulse), is used. When the total driving time of the plasma display panel is a second time longer than the first time, a second number of reset pulses, that is, two reset pulses (second reset pulse and third reset pulse) are used.

Here, the first, second, and third reset pulses rapidly rise from the first voltages V1 and V1 'to the second voltages V2 and V2', respectively, and then from the second voltages V2 and V2 'to the third voltage. The waveform gradually rises to a predetermined slope up to (V3, V3 '). Since the reset pulse has been described in detail above, redundant description thereof will be omitted.

Next, referring to FIG. 4B, when the total driving time of the plasma display panel is the first time, only one reset pulse, that is, the first reset pulse is used, and the second driving time of which the total driving time of the plasma display panel is longer than the first time. In this case, three reset pulses, that is, a second reset pulse, a third reset pulse and a fourth reset pulse, are used.

4A to 4B, when the total driving time of the plasma display panel is the second time longer than the first time, the number of reset pulses supplied to the sustain electrode, preferably the scan electrode Y in the reset period, That is, it is preferable that 2nd number is two or more and three or less.

As described above, the reason why the number of reset pulses supplied when the second number, that is, the total driving time of the plasma display panel is longer than the first time, is set to two or more and three or less prevents the occurrence of false discharge. In order to prevent excessive increase in driving time. For example, when four or more reset pulses are supplied to the sustain electrode, the entire driving time is insufficient due to an excessively long reset period in one subfield.

In the case of FIG. 4B, the number of reset pulses is increased as compared with the case of FIG. 4A, and since the rest pulses are substantially the same, further descriptions thereof will be omitted.

As such, when the total driving time of the plasma display panel is the second longer time, the reason for increasing the number of reset pulses supplied to the sustain electrode, preferably the scan electrode Y is that the total driving time of the plasma display panel is increased. This is because the discharge characteristics change as the discharge start voltage decreases with increasing.

For example, the discharge start voltage is lowered when the total driving time of the plasma display panel is a second time that is relatively longer than the first time. As a result, the intensity of the reset discharge, the address discharge, and the sustain discharge becomes excessively strong, thereby making the discharge unstable, thereby unstable the distribution of the wall charges in the discharge cells after the discharge.

In such a case, when a plurality of reset pulses are supplied to the sustain electrode, preferably the scan electrode Y in the reset period for initialization, the distribution of the wall charges in the unstable discharge cells due to unstable discharge becomes even.

As a result, the occurrence of erroneous discharges such as discharge does not occur in the discharge cells to be generated or discharge cells are not generated in the discharge cells that should not occur.

As described in detail above, when the number of reset pulses supplied to the sustain electrode is increased when the total driving time of the plasma display panel is the second time longer than the first time, the plurality of subfields included in the frame It is more preferable to increase the number of reset pulses supplied to the sustain electrode in the low gray level subfield, which will be described with reference to FIG. 5.

FIG. 5 is a diagram for explaining an example of a method of increasing the number of reset pulses supplied to a sustain electrode in a low gray level subfield among a plurality of subfields of a frame.

Referring to FIG. 5, in the low gray level subfield among the subfields included in the frame, when the total driving time of the plasma display panel is the second time longer than the first time, the number of reset pulses supplied to the sustain electrode is a plurality. In the remaining subfields except the low gray level subfield, the number of reset pulses is kept constant as one regardless of the total driving time of the plasma display panel.

For example, in the case where one frame includes a total of 12 subfields as shown in FIG. 5, the first, second, third, fourth, fifth, fifth, and fifth grayscale weights among the twelve subfields are relatively low. The sustain electrode when the six subfields are set to the low gray level subfield and the total driving time of the plasma display panel in the first, second, third, fourth, fifth, and sixth subfields is the second time longer than the first time; Preferably, the number of reset pulses supplied to the scan electrode Y is set to two (the second reset pulse and the third reset pulse), and the remaining subfields, i.e., the seventh, eighth, nineth, tenth, eleven, and twelve. In the subfield, the number of reset pulses is kept at one.

As described above, when the total driving time of the plasma display panel is the second time, the low gray level subfield increasing the number of reset pulses increases from the subfield having the lowest gray weight among the plurality of subfields included in the frame. At least one of the subfields up to the third subfield is preferable.

As such, when the total driving time of the plasma display panel increases, the number of reset pulses supplied to the sustain electrode is increased in a subfield having a relatively low gray scale weight. This is because discharge is more likely to be unstable because the number of sustain pulses supplied to the transistor is relatively small.

As described above, another example of the operation of the driving unit according to the present invention increases the number of reset pulses supplied to the sustain electrode as the total driving time of the plasma display panel increases.

6 is a view for explaining another example of the operation of the driver in the reset period.

Referring to FIG. 6, (a) shows a reset pulse when the total driving time of the plasma display panel is the first time, and (b) shows a reset pulse when the total driving time of the plasma display panel is the second time. In addition, (c) shows a reset pulse when the total driving time of the plasma display panel is the third time.

Comparing the reset pulses of (a), (b), (C), when the total driving time of the plasma display panel is the first time, the first number of reset pulses, that is, one reset pulse (first reset pulse) Only, and when the total driving time of the plasma display panel is a second time longer than the first time, a second number of reset pulses, that is, two reset pulses (second reset pulse and third reset pulse) are used. .

In addition, when the total driving time of the plasma display panel is a third time longer than the second time, a third number of reset pulses, that is, three reset pulses (fourth reset pulse, fifth reset pulse, and sixth reset pulse) may be used. use.

As described above, the number of reset pulses may be increased in order when a plurality of threshold times are set in advance and the total driving time of the plasma display panel exceeds a preset threshold time.

On the other hand, in the case where the total driving time of the plasma display panel increases, increasing the number of reset pulses makes it difficult to secure the driving time due to the increasing reset pulses. In order to solve this problem, the length of the address period can be reduced. This will be described with reference to FIGS. 7 to 8.

FIG. 7 is a diagram for explaining an example of a method for securing a driving time when the number of reset pulses increases.

8 is a diagram for explaining the scan pulse supplied in the address period in more detail.

First, referring to FIG. 7, (a) shows a case where the total driving time of the plasma display panel is the first time, and (b) shows a case where the total driving time of the plasma display panel is the second time.

For example, when the total driving time of the plasma display panel is a relatively short first time as shown in (a), one reset pulse is supplied to the sustain electrode in the reset period for initialization.

On the other hand, when the total driving time of the plasma display panel is a second time longer than the first time as shown in (b), two reset pulses are supplied to the sustain electrode. When a relatively large number of reset pulses are supplied as shown in (b), the length of the address period is shorter than in the case of (a).

As described above, when the total driving time of the plasma display panel is the second time longer than the first time as in (b), the length of the address period is shorter than in the case of the first time. This means that the width of the scan pulse supplied to the sustain electrode, preferably the scan electrode Y in the address period is made relatively narrower than the first time.

Next, referring to FIG. 8, when the total driving time of the plasma display panel is the first time, the scan pulse having the first width W1 is equal to or after the reset period in one or more subfields among the plurality of subfields included in the frame. Is supplied to the sustain electrode in the address period of &lt; RTI ID = 0.0 &gt;, &lt; / RTI &gt; on the other hand, a scan pulse of second width W2 equal to C narrower than the first width W1 in the case of B is supplied.

Here, the difference between the first width and the second width is preferably 10 ms (microseconds) or more and 100 ms (microseconds) or less. In other words, when the total driving time of the plasma display panel is the second time longer than the first time, the width of the scan pulse supplied to the sustain electrode in the address period is 10 s or more (microseconds) compared with the first time. Shorter within the range of 100 microseconds or less.

For example, assuming that the width W1 of the scan pulse in the first time is 500 ms (microseconds), the width W2 of the scan pulse in the second time is 400 ms (microseconds) or more and 490 Less than ㎲ (microseconds).

The reason is that when the total driving time of the plasma display panel is the second time, the length of the address period is short when the width of the scan pulse supplied to the sustain electrode is shorter than 10 microseconds (microsecond) compared to the first time. If it is not short enough, the overall driving time may be insufficient, and if it is shortened to more than 100 microseconds, the intensity of the address discharge becomes excessively weak and the discharge cells to be turned on are turned off. This is because there is a possibility of metastasis.

Here, more preferably, the difference between the first width and the second width is approximately 80 ms (microseconds).

On the other hand, when the total driving time of the plasma display panel is a second time longer than the first time, it is preferable to further stabilize the discharge by adding one or more reset pulses between two consecutive frames. This is as follows.

FIG. 9 illustrates an example of a method of supplying one or more reset pulses between two consecutive frames.

Referring to FIG. 9, when the total driving time of the plasma display panel is the second time, from the sustain period of the subfield having the highest gray scale weight among the plurality of subfields of the frame to before the reset period of the first subfield of the frame. In the period of, a third number of reset pulses are supplied to the sustain electrode.

In (a), two frames consisting of twelve subfields, for example, a first frame and a second frame, are arranged continuously.

Here, when the total driving time of the plasma display panel is the second time longer than the first time, the sustain period of the twelfth subfield having the highest gray scale weight among the subfields of the first frame and the first of the next second subfield. Between the reset period of the first subfield, that is, the first subfield, a plurality of reset pulses as in (b), for example, three reset pulses (first reset pulse, second reset pulse and third reset pulse) are supplied. .

As described above, when the total driving time of the plasma display panel is the second time, the period between the sustain period of the subfield having the highest gray scale weight among the plurality of subfields of the frame and before the reset period of the first subfield of the frame. The number of reset pulses, that is, the third number, supplied to the sustain electrode in the third embodiment is preferably one or more and four or less.

As such, the reason for supplying one or more reset pulses between two consecutive frames when the total driving time of the plasma display panel is the second time is to further stabilize the discharge in the first subfield of the next frame. .

In more detail, the subfields included in the frame are arranged in order of increasing gradation weight from the subfield having the lowest gradation weight. Accordingly, the subfield having the lowest gray scale weight is arranged first, and the discharge of the subfield having the lowest gray weight is most likely to be unstable compared to other subfields. Accordingly, one or more reset pulses are supplied between two consecutive frames to stabilize the discharge in the subfield having the lowest gray scale weight.

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 present invention adjusts the number of reset pulses according to the driving time of the plasma display panel, thereby preventing the discharge from becoming undefined and thereby stabilizing the wall charge in the discharge cell, thereby preventing the misfiring and the like. It is effective in suppressing occurrence.

Claims (8)

A plasma display panel having a sustain electrode formed thereon; When the total driving time of the plasma display panel is a first time, a first number of reset pulses are supplied to the sustain electrode in a reset period for initialization in a low gray level subfield among a plurality of subfields included in a frame, and In the case of a second time longer than the first time, the driving unit supplies a second number of reset pulses larger than the first number. Plasma display device comprising a. The method of claim 1, The low gradation subfield is And at least one of the subfields up to the third subfield in the order of increasing the gradation weight from the lowest gradation weight among the plurality of subfields included in the frame. The method of claim 1, And the second number is two or more and three or less. The method of claim 1, The driving unit In the case of the first time, a scan pulse of a first width is supplied to the sustain electrode in an address period after a reset period in one or more subfields of the plurality of subfields included in the frame, and in the case of the second time. And a scan pulse of a second width narrower than the first width. The method of claim 4, wherein And the difference between the first width and the second width is between 10 microseconds and 100 microseconds. The method of claim 5, And the difference between the first width and the second width is approximately 80 microseconds (microseconds). The method of claim 1, The driving unit In the second time, a third number is applied to the sustain electrode in a period from the sustain period of the subfield having the highest gray scale weight among the plurality of subfields of the frame to before the reset period of the first subfield of the frame. And a reset pulse of the plasma display device. The method of claim 7, wherein And the third number is one or more and four or less.

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