JPH11143422A - Driving method of plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an unnecessary margin reduction when the second discharge mainly with wall charges is used for a maintenance discharge by applying first auxiliary discharge pulses with a shape not causing the second discharge between an address discharge for selecting an optional cell and the maintenance discharge. SOLUTION: A whole writing pulse Pxp is applied to a first row electrode X connected to the whole screen in common during the initial reset period of one sub-field. A display cell optionally selected during the address period is discharged specified times to obtain display luminance during the maintenance period. Second auxiliary pulses Subp2 are applied between the maintenance period and reset period. The pulses Subp2 may have a shape not causing a discharge at a trailing edge like pulses Subp1. When the second discharge mainly with wall charges is used for a maintenance discharge, a large voltage margin is obtained, and the stable maintenance discharge can be conducted with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC plasma display panel (hereinafter referred to as an AC-PDP), and more particularly to a method of driving a surface discharge type AC-PDP.

[0002]

2. Description of the Related Art As is well known, a plasma display panel has a structure in which minute discharge cells (pixels) are formed between two glass plates, and has been variously studied as a thin television or display monitor. One of them is an AC plasma display panel (AC-PDP) having a memory function. As one of AC-PDPs, there is a surface discharge type AC-PDP. FIG. 6 is a perspective view showing the structure of a surface discharge type AC-PDP.
22 and JP-A-7-287548. In the figure, reference numeral 1 denotes a surface discharge type plasma display panel, 2 denotes a front glass substrate serving as a display surface, and 3 denotes a rear glass substrate which is arranged to face the front glass substrate 2 with a discharge space therebetween. 4 and 5 were coated on an first row electrodes X ₁ to X _n and the second row electrodes Y ₁ to Y _n, 6 on these row electrodes which are formed so as to be paired with each other on a front glass substrate The dielectric layer 7 is MgO (magnesium oxide) formed on the dielectric layer by a method such as vapor deposition. 8 is a column electrode W formed on the back glass substrate so as to be orthogonal to the row electrode.
Reference numerals _{1 to} W _m and 9 denote phosphor layers formed on the column electrodes, and phosphor layers that emit red, green, and blue light, respectively, are provided in stripes in order for each column electrode. Reference numeral 10 denotes a partition formed between the column electrodes. The partition has a role of separating the discharge cells and also a role of a column for preventing the PDP from being crushed by the atmospheric pressure. In the space between the glass substrates, a discharge gas such as a Ne-Xe mixed gas or a He-Xe mixed gas is sealed at a pressure lower than the atmospheric pressure, and a discharge cell at an intersection of a row electrode and a column electrode orthogonal to each other is formed as a pixel. Become. Hereinafter, the first row electrode may be called an X electrode, the second row electrode may be called a Y electrode, and the column electrode may be called a W electrode.

At the time of display, a voltage pulse is alternately applied between both row electrodes to cause a discharge in which the polarity is inverted every half cycle, thereby causing the cell to emit light. In the color display, the phosphor layer 9 formed in each cell is excited by ultraviolet light from discharge to emit light. Since the first row electrode 4 and the second row electrode 5 for performing the discharge for display are covered with the dielectric layer 6, once a discharge occurs between the electrodes of each cell, the electrons generated in the discharge space are generated. And ions move in the direction of the applied voltage and accumulate on the dielectric layer 6. The charges such as electrons and ions accumulated on the dielectric layer are called wall charges. The electric field formed by the wall charges acts in a direction to weaken the applied electric field, and thus the discharge is rapidly extinguished with the formation of the wall charges. After the discharge has disappeared,
When an electric field whose polarity is inverted from that of the previous discharge is applied, the electric field formed by the wall charges and the applied electric field are superimposed in a direction in which the electric field is strengthened, so that the discharge can be performed with a lower applied voltage than the previous discharge. Thereafter, the discharge can be maintained by inverting the low voltage every half cycle. of course,
In the steady state, the wall charge depends on the externally applied voltage,
Wall charges higher than the externally applied voltage cannot be formed. Therefore, it can be said that the wall voltage acts as an auxiliary voltage to the extent that the effective voltage for the discharge applied to the cell is mainly the externally applied voltage. Here, this discharge at the rise of the voltage pulse is called "discharge mainly composed of an externally applied voltage". On the other hand, when the externally applied voltage is very high, the wall charges to be formed may be higher than the discharge starting voltage. At this time, at the fall of the voltage pulse, discharge is performed only by the wall charges. This second discharge that occurs when no external voltage is applied may be called a self-erasing discharge. here,
A discharge in which the effective voltage mainly includes wall charges and the externally applied voltage assists, including a case where a voltage is externally applied, is referred to as a “mainly wall-charged discharge”.

[0004] In this manner, once turned on, wall charges are formed, and a discharge maintained at a low applied voltage thereafter is called a sustain discharge, and is applied to the first row electrode 4 and the second row electrode 5 every half cycle. The applied voltage pulse is called a sustain pulse. This sustain discharge is continued as long as the sustain pulse is applied, until the wall charges disappear. Eliminating the wall charges is called erasing, and first forming the wall charges on the dielectric is called writing.

Writing is performed for an arbitrary cell on the screen of the AC-PDP, and thereafter, by performing a sustain discharge, characters, figures, images, etc. can be displayed. In addition, writing, sustaining discharge, and erasing can be performed at high speed. By
Moving images can also be displayed. When performing gradation display,
This can be performed by controlling the time for emitting light in the sustain discharge.

FIG. 7 shows a conventional driving method using a self-erasing discharge for a sustain discharge disclosed in, for example, Japanese Patent Application Laid-Open No. 8-314405. This method is used in a steady state where the discharge start voltage is not affected by charged particles, etc., accumulates sufficient wall charges equal to or higher than the discharge start voltage during the voltage application period, and between the pulses during the sustain period (hereinafter, referred to as This is a method in which a self-erasing discharge is generated during the idle period by setting the idle period) to the ground state. During the idle period, since no externally applied voltage is present, charged particles are not attracted to the display electrode and there is no ion bombardment, and the number of times of light emission is twice the number of times of application. Furthermore, the self-erasing discharge used here controls the self-erasing discharge by reducing the pulse width to reduce the amount of accumulated wall charge, so that the self-erasing discharge does not occur, and when the applied voltage is reduced, the self-erasing discharge does not occur. This is useful for gradation display.

FIG. 8 shows an example of the prior art disclosed in Japanese Patent Application Laid-Open No. Hei 7-134565, in which a method of providing an auxiliary discharge before a sustain discharge is shown. This method is called "address
Focusing on the fact that the initial period of the sustain discharge becomes unstable in cells with a long time from address discharge to sustain discharge, an auxiliary discharge is provided before the sustain discharge by utilizing the `` sustain separation method ''. . Specifically, in consideration of a discharge delay, the pulse before the sustain discharge has a sufficiently wide pulse width or a high voltage.

[0008]

When the second discharge mainly composed of wall charges generated at the falling edge of the pulse is used for the sustain discharge, it is compared with the sustain discharge using only the first discharge mainly composed of the externally applied voltage. As a result, the wall charge is reduced, so that it is difficult to connect to the next sustain discharge. In particular, there is a problem that once the sustain discharge occurs, the space charge disappears because the space charge is small in the initial stage of the sustain discharge. This problem requires an unnecessarily high sustain voltage and narrows a voltage margin required for stable discharge.

Further, since the last of the sustain discharge is a discharge mainly composed of wall charges, there is a problem that it is difficult to turn on the next erase pulse because the wall charges are small in this state.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been described in connection with a second aspect of the invention, in which a sustain discharge mainly includes wall charges.
It is an object of the present invention to provide a method of driving a plasma display which can prevent an unnecessary decrease in margin when using the above-described discharge and can surely perform an erasing operation.

[0011]

According to a first aspect of the present invention, there is provided a driving method of a plasma display having a structure in which at least one electrode is covered with a dielectric material. An address discharge for selecting an arbitrary cell and the above-mentioned sustain discharge in a driving method in which the sustain discharge performed a number of times includes a first discharge mainly composed of an externally applied voltage and a second discharge mainly composed of generated wall charges. And applying a first auxiliary discharge pulse having a shape that does not cause the second discharge.

Further, in the driving method of the plasma display according to the second configuration of the present invention, the pulse width of the pulse group for the first auxiliary discharge is wider than the pulse width of the pulse group for the sustain discharge. is there.

In the driving method for a plasma display according to a third configuration of the present invention, the pulse pause period of the pulse group for the first auxiliary discharge is narrower than the pulse pause period of the pulse group for the sustain discharge. Things.

Further, in the driving method of the plasma display according to the fourth configuration of the present invention, the pulse fall speed of the pulse group for the first auxiliary discharge is set to the pulse fall speed of the pulse group for the sustain discharge. Slower than.

[0015] Further, a driving method of a plasma display according to a fifth configuration of the present invention is a plasma display having a structure in which at least one electrode is covered with a dielectric.
In the driving method, a sustain discharge to be performed a specified number of times to obtain an arbitrary luminance includes a first discharge mainly including an externally applied voltage and a second discharge mainly including generated wall charges. And applying a second auxiliary discharge pulse having a shape that does not cause the second discharge.

In the driving method for a plasma display according to the sixth configuration of the present invention, the pulse width of the second auxiliary discharge pulse is wider than the pulse width of the pulse group for the sustain discharge.

Further, in the driving method of the plasma display according to the seventh configuration of the present invention, the pulse pause period of the second auxiliary discharge pulse is shorter than the pulse pause period of the pulse group for the sustain discharge.

In the driving method for a plasma display according to an eighth aspect of the present invention, the pulse fall speed of the second auxiliary discharge pulse is lower than the pulse fall speed of the pulse group for the sustain discharge. is there.

Further, in the driving method of the plasma display according to the ninth configuration of the present invention, the sustain discharge in the subfield having less luminance information is constituted only by the first or second auxiliary discharge.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An embodiment of the present invention will be described with reference to the drawings. The panel used is Figure 6
A conventional panel similar to the above may be used. FIG. 1 is a voltage waveform (timing chart) showing a driving method of the plasma display panel according to the first embodiment of the present invention. In the figure, the voltage waveforms are column electrodes Wj, first row electrodes Xi, 7 is a voltage waveform applied to a second row electrode Yi.
Pxp is a priming pulse (full-surface write pulse) applied to the Xi electrode for performing full-surface writing and erasing, and Pwp is a pulse applied to the Wj electrode at the same timing. These may be applied once to several subfields, but may be applied to all subfields. When Pxp is applied once in several subfields, the erase pulse Exp is applied to the remaining subfields. In this embodiment, a narrow erase pulse is used for Exp, but a wide erase pulse, a round pulse, or the like may be used. Sp is a sustain pulse for performing a sustain discharge, Subp1 is an auxiliary pulse applied before the sustain discharge, Subp2 is an auxiliary pulse applied after the sustain discharge, Scyp is a scan pulse for scanning, and Awp is according to display data contents. This is an applied address pulse.
In this embodiment, for example, the priming pulse Pxp has a pulse width of 7 μsec, the voltage of 310 V and Pwp is 150 V, the sustain pulse Sp is 1.5 μsec, and the period is 4 μs.
ec (rest period 0.5 μsec), 180 V, fall time 200 nsec, scan pulse Scyp is -180
V, address pulse Awp is 60 V, erase pulse Exp
Is a voltage of 180 V, 0.5 μsec, an auxiliary pulse Subp
1, subp2 is set to 180 V, pulse width 4 μsec, fall time 200 nsec, and rest period 1 μsec.

Next, the operation will be described. First, in the reset period at the beginning of one subfield, the entire-surface write pulse Pxp is applied to the first row electrodes X commonly connected to all the screens. Since this pulse has a high voltage of 310 V, discharge is started between the first row electrode X and the second row electrode Y, and a large amount of wall charges are generated. Thereafter, at the falling edge of Pxp, the discharge is performed again using only the generated accumulated wall charges. However, since there is no externally applied voltage, after this discharge,
No reverse charge is formed, only the amount of wall charge is reduced.
When the reset period ends, the operation enters the address period. The negative scan pulse S is sequentially applied to the independent second row electrodes Y1 to Yn.
An address pulse Awp corresponding to the image data is applied to the column electrode Wj at the same time as the cyp is applied, and the displayed cells are discharged in a matrix. At this time, a discharge is generated between the X and Y electrodes triggered by a discharge between the Y and W electrodes, thereby forming a wall charge on the X and Y electrodes and writing is performed.

In the sustain period, display luminance is obtained by discharging a display cell arbitrarily selected in the address period a specified number of times. The sustain pulse Sp during the sustain period is set so that a discharge due to wall charges occurs at the fall. That is, the point at which the voltage falls at 1.5 μsec when there is a large amount of space charge and the discharge starting voltage is low,
It is controlled by the point that the discharge mainly consisting of wall charges is positively generated by securing a rest period of sec, and that the fall time is sufficiently shorter than the discharge delay time. In the case of the conventional sustain discharge, it is maintained by the memory effect using wall charge, but in this case, since the wall charge is reduced at the falling edge of the pulse, it is maintained by the pulse memory effect using space charge Become. At the beginning of the sustain period, the space charge is small, and it is difficult to maintain the discharge. Therefore,
It is necessary to form a large amount of space charges and to stabilize wall charges early in the sustain period. Therefore, here, an auxiliary pulse Subp1 that does not cause a falling discharge is applied before the sustain period using the falling discharge. Since the auxiliary pulse Subp1 has a wide pulse width of 4 μsec, the space charge generated by the discharge at the rise of the pulse decreases at the fall. Therefore, there is no longer any effect of lowering the discharge starting voltage. Even if the amount of wall charges is the same as that of the sustain pulse having a pulse width of 1.5 μsec, no falling discharge occurs.

The auxiliary pulse Subp1 of the present invention is different from a pulse for relieving a discharge delay as disclosed in Japanese Patent Application Laid-Open No. Hei 7-134565 and focuses on preventing a falling discharge from occurring. Things. Therefore, it is not necessary to apply a long pulse, and a pulse of any shape may be used as long as the waveform condition does not cause a falling discharge.

When the maintenance period ends, the reset period starts again. Since a narrow pulse is used as the erase pulse Exp, it is necessary to minimize a discharge delay. A discharge delay longer than the pulse application period causes erase failure,
Even if the cell is discharged during the application period, the cell variation is large, so that the residual wall charge after erasing tends to vary. This difference in the amount of residual wall charge leads to a decrease in the address margin. Therefore, the second auxiliary pulse Subp2 is applied between the sustain period and the reset period. Subp2 is Subp1
It is only necessary that the shape be such that no discharge occurs at the falling edge in the same manner as described above.

The application of the second auxiliary pulse Subp2 increases the wall charges that have been reduced during the sustain period. In general, when a high voltage is applied, the discharge delay becomes small. Therefore, although the erase pulse Exp is equal to the sustain pulse voltage, the voltage applied to the discharge gap becomes apparently high due to the increase in the wall charge. It can be carried out. As described above, it is desirable that the interval between the auxiliary pulse Subp2 and the erase pulse Exp be as short as possible in order to minimize the discharge delay.

Further, the sustain discharge using the discharge at the falling edge of the present invention is different from the self-erasing discharge by applying a high voltage disclosed in Japanese Patent Application Laid-Open No. 8-314405. The purpose of the present invention is to reduce the current density by avoiding a rise in the voltage, improve the efficiency, and increase the voltage margin. Further, the second discharge mainly composed of wall charges shown in the present invention may be configured such that a self-erase assisting pulse as shown in FIG. 2 is applied. As a result, the discharge at the falling edge becomes stronger, so that higher efficiency can be achieved.

Embodiment 2 FIG. Hereinafter, another embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a voltage waveform diagram and a light emission waveform diagram showing a form of an auxiliary pulse in a method of driving a plasma display panel according to a second embodiment of the present invention. In the figure, the holding pulse Sp is the same as in the first embodiment, a voltage of 180 V, a pulse width of 1.5 μsec, and a period of 4 μsec.
Subp1 = Subp2 = 180 V, pulse width 1.5 μ, cycle 3 μsec (pause period 0 μsec).

By adopting this configuration having no pause period, a falling discharge in the auxiliary discharge can be avoided as in the first embodiment, so that a stable sustain discharge and a stable erase discharge can be performed. Further, in the present embodiment, the pause period is set to 0 μsec, but a pause period may be provided as long as the discharge does not occur at the falling edge.

Embodiment 3 Hereinafter, another embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a voltage waveform diagram and a light emission waveform diagram showing a form of an auxiliary pulse in a method of driving a plasma display panel according to a third embodiment of the present invention. In the figure, the sustain pulse Sp is the same as in the first embodiment, a voltage of 180 V, a pulse width of 1.5 μsec, and a period of 4 μse
c and the first and second auxiliary pulses Subp
1 and Subp2 have the same setting. However, in the embodiment of the present invention, the fall time of Sp is set to 200 nsec, whereas the fall time of Subp1 and Subp2 is set to 600 nsec.

By making the fall time of the auxiliary pulse sufficiently longer than the discharge delay time of the fall discharge, the fall discharge in the auxiliary discharge can be avoided as in the first embodiment. Thus, stable erase discharge can be performed.

In all of the first to third embodiments, the first auxiliary pulse Subp1 and the second auxiliary pulse Subp are used.
Although the conditions of p2 are configured to be equal, the conditions may be set independently.

Embodiment 4 FIG. Another embodiment of the present invention will be described with reference to the drawings. FIG. 5 shows Embodiment 4 of the present invention.
FIG. 4 is a diagram showing a configuration of a subfield in one field of the driving method of the plasma display panel as the above. One field consists of eight subfields, and the sustain pulse in each subfield is approximately binary weighted. The subfield having the least luminance information is generally called an LSB, and hereinafter referred to as 2LSB, 3LSB... On the other hand, a subfield having the largest amount of luminance information is called an MSB, and is similarly called 2MSB, 3MSB,... In the present embodiment, the total pulse period is 255, and LS
1, 2, 4, 8, 16, 32, 64, 128 in order from B
It is weighted. In the present embodiment, LS
B, up to 2 LSB, composed of only auxiliary pulses, 3 LSB
Thereafter, the first auxiliary pulse Sub is applied to all subfields.
p1 is applied for two periods, and the second auxiliary pulse Subp2 is applied for one period. The remainder of the assigned pulse period is supplemented with sustain pulses. For example, the sustain pulse has one cycle for 3 LSB, and the sustain pulse has 125 cycles for MSB. The auxiliary pulse described in the embodiment of the present invention may be any of the forms shown in the first to third embodiments.

It is difficult to insert an auxiliary pulse into all subfields in performing a gray scale display. Therefore,
In the present embodiment, sustain discharge using falling discharge is not performed in a subfield having less luminance information. Of course, this configuration may be only the LSB or a configuration up to 2 or 3 LSBs. In terms of the efficiency improvement by using the falling discharge during the sustain period, even this configuration has little effect.

In the present embodiment, the first auxiliary pulse Sub
The number of pulses of p1 is set to be larger than the number of pulses of the second auxiliary pulse Subp2. This is because space charge is poor during the first auxiliary pulse application period, and space charge is abundant during the second auxiliary pulse application period immediately after the sustain period.

[0035]

In the plasma display driving method according to the first configuration of the present invention, a plasma display having a structure in which at least one electrode is covered with a dielectric is performed a specified number of times to obtain an arbitrary luminance. In a driving method in which a sustain discharge is composed of a first discharge mainly composed of an externally applied voltage and a second discharge mainly composed of a generated wall charge, an address discharge for selecting an arbitrary cell and the above-mentioned sustain discharge. Since the first auxiliary discharge pulse having a shape that does not cause the second discharge is applied in between, a large voltage margin can be obtained even when the second discharge mainly composed of wall charges is used for the sustain discharge. An efficient and stable sustain discharge can be performed.

In the plasma display driving method according to the second configuration of the present invention, the pulse width of the pulse group for the first auxiliary discharge is wider than the pulse width of the pulse group for the sustain discharge. In addition, a large voltage margin is obtained even when the second discharge mainly composed of wall charges is used for the sustain discharge, and a high-efficiency and stable sustain discharge can be performed.

In the plasma display driving method according to the third configuration of the present invention, the pulse pause period of the pulse group for the first auxiliary discharge is narrower than the pulse pause period of the pulse group for the sustain discharge. Therefore, even when the second discharge mainly composed of wall charges is used for the sustain discharge, a large voltage margin can be obtained, and a highly efficient and stable sustain discharge can be performed.

In the driving method of the plasma display according to the fourth configuration of the present invention, the pulse falling speed of the pulse group for the first auxiliary discharge is equal to the pulse falling speed of the pulse group for the sustain discharge. Therefore, a large voltage margin can be obtained even when the second discharge mainly composed of wall charges is used for the sustain discharge, and a highly efficient and stable sustain discharge can be performed.

In the driving method for a plasma display according to the fifth aspect of the present invention, the sustain discharge is performed a specified number of times to obtain an arbitrary brightness in a plasma display having at least one electrode covered with a dielectric. Is a driving method comprising a first discharge mainly composed of an externally applied voltage and a second discharge mainly composed of generated wall charges, wherein the second discharge is generated between the sustain discharge and the erase discharge. Since the second auxiliary discharge pulse having no shape is applied, erasure can be reliably performed even when the second discharge mainly composed of wall charges is used for the sustain discharge.

In the plasma display driving method according to the sixth aspect of the present invention, the pulse width of the second auxiliary discharge pulse is wider than the pulse width of the pulse group for the sustain discharge. Even when the second discharge mainly composed of wall charges is used, reliable erasure is possible.

In the plasma display driving method according to the seventh aspect of the present invention, the pulse pause period of the second auxiliary discharge pulse is shorter than the pulse pause period of the pulse group for the sustain discharge. Even when the second discharge mainly composed of wall charges is used for the discharge, reliable erasure is possible.

In the driving method of the plasma display according to the eighth aspect of the present invention, the pulse fall speed of the second auxiliary discharge pulse is lower than the pulse fall speed of the pulse group for the sustain discharge. Even when the second discharge mainly composed of wall charges is used for the sustain discharge, reliable erasure is possible.

In the method for driving a plasma display according to the ninth aspect of the present invention, the sustain period in the subfield having less luminance information is constituted only by the first or second auxiliary discharge, so that the field period is lengthened. Without the need for gradation display.

[Brief description of the drawings]

FIG. 1 is a voltage waveform diagram showing a method for driving a plasma display panel according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a voltage waveform and a light emission waveform when a self-erasing assistance pulse is applied.

FIG. 3 is a voltage waveform diagram and a light emission waveform diagram showing a form of an auxiliary pulse in a method of driving a plasma display panel according to a second embodiment of the present invention.

FIG. 4 is a voltage waveform diagram and a light emission waveform diagram showing a form of an auxiliary pulse in a method of driving a plasma display panel according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a subfield in one field of a driving method of a plasma display panel according to a fourth embodiment of the present invention.

FIG. 6 is a perspective view showing a structure of a surface discharge type AC-PDP.

FIG. 7 is a diagram for explaining a conventional driving method disclosed in Japanese Patent Application Laid-Open No. 8-314405.

FIG. 8 is a diagram for describing a conventional driving method disclosed in Japanese Patent Application Laid-Open No. 7-134565.

[Explanation of symbols]

Reference Signs List 1 plasma display panel or cell, 2 front glass substrate, 3 back glass substrate, 4 first row electrode (X electrode), 5 second row electrode (Y electrode), 6 dielectric layer, 7 MgO (magnesium oxide) , 8 row electrodes, 9
Phosphor layer, 10 barrier ribs, Pxp priming pulse (full write pulse), Awp address pulse, S
p sustain pulse, Scyp scan pulse, Exp
Erase pulse, Subp1 First auxiliary pulse, Sub
p2 Second auxiliary pulse.

Claims (9)

[Claims] 1. A plasma display having a structure in which at least one electrode is covered with a dielectric, wherein a sustain discharge performed a specified number of times to obtain an arbitrary luminance is performed by a first discharge mainly composed of an externally applied voltage and a generated wall. In a driving method including a second discharge mainly composed of electric charges, a first auxiliary discharge having a shape in which the second discharge does not occur between an address discharge for selecting an arbitrary cell and the sustain discharge. A method for driving a plasma display panel, comprising applying a pulse. 2. The method according to claim 1, wherein a pulse width of the pulse group for the first auxiliary discharge is wider than a pulse width of the pulse group for the sustain discharge. 3. The driving of the plasma display panel according to claim 1, wherein a pulse pause period of the pulse group for the first auxiliary discharge is shorter than a pulse pause period of the pulse group for the sustain discharge. Method. 4. The plasma display according to claim 1, wherein the pulse fall speed of the pulse group for the first auxiliary discharge is lower than the pulse fall speed of the pulse group for the sustain discharge. Panel driving method. 5. A plasma display having a structure in which at least one electrode is covered with a dielectric, wherein a sustain discharge performed a specified number of times to obtain an arbitrary brightness is performed by a first discharge mainly composed of an externally applied voltage and a wall generated. In a driving method including a second discharge mainly composed of electric charges, a second auxiliary discharge pulse having a shape that does not cause the second discharge is applied between the sustain discharge and the erase discharge. Driving method for a plasma display panel. 6. The method according to claim 5, wherein a pulse width of the second auxiliary discharge pulse is wider than a pulse width of the pulse group for the sustain discharge. 7. The driving method of a plasma display panel according to claim 5, wherein a pulse pause period of the second auxiliary discharge pulse is shorter than a pulse pause period of the pulse group for the sustain discharge. 8. The method according to claim 5, wherein the pulse fall speed of the second auxiliary discharge pulse is lower than the pulse fall speed of the pulse group for the sustain discharge. 9. The plasma display panel according to claim 1, wherein the sustain discharge in the subfield having less luminance information is composed of only the first or second auxiliary discharge. Drive method.