KR100536530B1 - A plasma display device and a driving method of the same - Google Patents

Abstract

The present invention relates to a plasma display device for implementing the AWD driving method and a driving method thereof.

According to the present invention, in a plasma display device in which an M electrode is formed between an X electrode and a Y electrode, a sustain discharge pulse is alternately applied to the X electrode and the Y electrode during all sections, and a reset waveform and a scan pulse are applied to the M electrode. do. At this time, according to the present invention, the scan pulse is applied to the M electrode for both the time when the sustain discharge pulse is applied to the X electrode and the time when the sustain discharge pulse is applied to the Y electrode.

Therefore, the present invention can increase the scan pulse width as compared with the prior art, thereby performing an accurate address operation, and since the voltage waveform is almost symmetrically applied to the X electrode and the Y electrode, it is necessary to drive the X electrode and the Y electrode. The circuit can be designed almost identically.

Description

Plasma display device and driving method thereof {A PLASMA DISPLAY DEVICE AND A DRIVING METHOD OF THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device and a driving method thereof, and more particularly, to a plasma display device and a driving method thereof driven by an address-display simultaneous driving method.

A plasma display device is a flat display device that displays characters or images by using plasma generated by gas discharge, and includes a plasma display panel (hereinafter referred to as a 'PDP') in which tens to millions of pixels are arranged in a matrix form. It consists of a peripheral circuit for driving it.

The plasma display device is classified into a direct current type (DC type) and an alternating current type (AC type) according to the shape of a driving voltage waveform to be applied and the structure of a discharge cell.

In the DC plasma display device, since the electrode is exposed to the discharge space as it is, the current flows in the discharge space while the voltage is applied, and there is a disadvantage in that a resistance for current limitation must be made for this purpose. On the other hand, in the AC plasma display device, since the electrode covers the dielectric layer, the current is limited by the formation of a natural capacitance component, and thus the electrode is protected from the impact of ions during discharge.

1 is a partial perspective view of an AC plasma display panel.

As shown in FIG. 1, the plasma display panel includes two glass substrates 1 and 6 facing each other apart. On the glass substrate 1, the scan electrode 4 and the sustain electrode 5 are formed in pairs and in parallel, and the scan electrode 4 and the sustain electrode 5 are covered with the dielectric layer 2 and the protective film 3. have. A plurality of address electrodes 8 are formed on the glass substrate 6, and the address electrodes 8 are covered with the insulator layer 7. The address electrode 8 and the partition 9 are formed on the insulator layer 7 between the address electrodes 8. In addition, the phosphor 10 is formed on the surface of the insulator layer 7 and on both sides of the partition wall 9. The glass substrates 1 and 6 are disposed to face each other with the discharge space 11 therebetween so that the scan electrode 4, the address electrode 8, the sustain electrode 5, and the address electrode 8 are orthogonal to each other. The discharge space 11 at the intersection of the address electrode 8 and the paired scan electrode 4 and the sustain electrode 5 forms a discharge cell 12.

As shown in FIG. 2, the electrode of the plasma display panel has a matrix structure of n × m. In the column direction, address electrodes A ₁ -A _m are arranged, and in the row direction, n rows of scan electrodes Y ₁ -Y _n and sustain electrodes X ₁ -X _n are arranged in pairs.

The plasma display device drives one frame into a plurality of subfields, and each subfield includes a reset period, an address period, and a sustain period.

The reset period is a period for initializing the state of each cell in order to perform an addressing operation smoothly on the cell, and the address period (or scan period, write period) is a cell that is turned on by selecting a cell that is turned on and a cell that is not turned on. This is a period during which the wall charges are accumulated in the addressed cells). The sustain period is a period in which discharge for actually displaying an image on the addressed cells is performed.

In order to drive the plasma display panel shown in Figs. 1 and 2, an address-display separation driving method (hereinafter, referred to as an 'ADS driving method') is generally used.

3 is a view showing a conventional ADS driving method.

Referring to FIG. 3, a unit frame is divided into eight subfields SF1, ..., SF8 in order to realize time division gray scale display. Each subfield SF1, ..., SF8 is divided into a reset period (not shown), an address period A1, ..., A8 and a sustain period S1, ..., S8.

In each reset period (not shown), an erase waveform is applied to all Y electrodes to erase the wall charges formed in the previous sustain period, and then a reset waveform is applied to initialize the state of each cell in order to perform the addressing operation smoothly. .

In each address period A1, ..., A8, an address signal is applied to the address electrodes (A1, ..., Am in Fig. 2) and simultaneously applied to each scan electrode Y1, ..., Yn. Scan pulses are applied sequentially. In this way, wall charges are formed by the address discharge in the discharge cell to which the high level address signal is applied while the scan pulse is applied, and wall charges are not formed in the discharge cell that is not.

In each sustain period S1, ..., S8, sustain discharge pulses are alternately applied to all the scan electrodes Y1, ..., Yn and all sustain electrodes X1, ..., Xn. During the address periods A1, ..., A6, display discharge occurs in discharge cells in which wall charges are formed.

The luminance of the plasma display panel is proportional to the length of the sustain periods S1, ..., S8 occupy in the unit frame. The lengths of the sustain periods S1, ..., S8 occupy a unit frame are 255T (T is a unit time). Therefore, it can be displayed in 256 gray scales, even if it is not displayed once in a unit frame.

According to the ADS driving method as described above, since the time domain of each subfield SF1, ..., SF8 is separated in a unit frame, the reset period, the address period, and the like in each subfield SF1, ..., SF8 are separated. The time domain of the sustain period is also separated from each other. Therefore, in the address period, for example, when a specific first scan electrode and first sustain electrode pair are addressed, the sustain discharge operation cannot be performed immediately, and the sustain discharge operation must be waited until all other scan electrode and sustain electrode pairs are addressed. do. As a result, the time period occupied by the address period becomes longer for each subfield, so that the display period (dielectric zone period) becomes relatively short, so that the luminance of light emitted from the plasma display panel is relatively low.

In order to solve this problem, an address-display simultaneous driving method has been proposed.

4 is a diagram illustrating a conventional AWD driving method.

Referring to FIG. 4, a unit frame is divided into eight subfields SF1,..., SF8 for time division gray scale display. Here, each unit sub-field overlaps each other based on the scan electrodes Y1, ..., Yn being driven to form a unit frame. Therefore, all subfields SF1, ..., SF8 are present at all time points, and at any point in time, a sustain discharge pulse is applied to the jth scan electrode while a scanning pulse is applied to the i th scan electrode and addressed. Is approved. In other words, addressing and display take place simultaneously. Also in this case, the luminance of the plasma display panel is proportional to the length of the sustain periods S1, ..., S8 occupied in the unit frame, and thus can be displayed in 256 gray levels.

5 is a view showing an AWD driving waveform described in US Pat. No. 6495968.

In Fig. 5, EP denotes an erase pulse, which erases wall charges accumulated during a sustain discharge, and RPy is a reset pulse used to initialize the state of a discharge cell before performing an address operation. . DPi and SP represent an address pulse and a scan pulse, respectively, and negative wall charges are accumulated on the address electrode and positive wall charges are accumulated on the Y electrode by the address pulse DPi and the scan pulse SP of the Y electrode. . IPy and IPx represent sustain discharge pulses applied to the Y electrode and the X electrode, respectively, and as shown in FIG. 5, the sustain discharge pulse is applied to the other Y electrode or the X electrode even while the scan pulse is applied to the specific Y electrode. Is approved.

However, according to the conventional AWD driving method shown in FIG. 5, the scan operation is performed only on the scan electrode Y and the scan operation is not performed on the sustain electrode (X electrode). Therefore, according to the conventional AWD driving method, since the scan operation is performed only on the scan electrode, the scan pulse width is so small that accurate address operation is difficult, and the number of subfields is limited because the scan operation cannot be performed much. There was a problem.

Further, according to the conventional AWD driving method shown in FIG. 5, only the sustain discharge pulse IPx is applied to the X electrode, but the erase pulse EP, the reset pulse RPy, and the scan pulse (in addition to the sustain discharge pulse) are applied to the Y electrode. Since SP) is applied, the waveform applied to the Y electrode and the waveform applied to the X electrode are different. Accordingly, since the circuit for driving the Y electrode and the circuit for driving the X electrode are different, the driving circuits of the X electrode and the Y electrode do not have impedance matching, and are alternately applied to the X electrode and the Y electrode in the sustain discharge period. The resulting waveform is distorted, resulting in a problem of poor discharge.

In addition, according to the conventional AWD driving method, since the waveform applied to the Y electrode is complicated, there is a problem that a power recovery circuit (ERC) circuit used for the Y electrode is complicated.

The technical problem to be achieved by the present invention is to solve the problems of the prior art, and to provide an AWD driving method for performing an accurate address operation. In addition, the present invention is to provide a plasma display device and a driving method thereof for preventing a discharge failure.

A driving method of a plasma display device according to an aspect of the present invention for achieving the above object is

A first electrode and a second electrode to which a sustain discharge pulse is applied, an intermediate electrode formed between the first electrode and the second electrode, and a third electrode intersecting the first, electrode, second electrode, and intermediate electrode. As a driving method of a plasma display device,

(a) alternately applying a sustain discharge pulse to the first electrode and the second electrode during a first period; And

(b) applying a first scan pulse to a first intermediate electrode corresponding to the first electrode and applying a second scan pulse to a second intermediate electrode corresponding to the second electrode during a portion of the first interval; And applying an address voltage to the third electrode.

Here, the driving method may include applying a reset waveform falling from a first voltage to a second voltage to the intermediate electrode before step (b).

On the other hand, the plasma display device according to the features of the present invention

A plasma display including an X electrode and a Y electrode to which sustain discharge voltage pulses are respectively applied, and an M electrode formed between the X electrode and the Y electrode, and an address electrode insulated from and crossing the X electrode, the Y electrode, and the M electrode; panel;

An address driver for applying a display data signal for selecting a discharge cell to the address electrode;

An X electrode driver and a Y electrode driver for applying sustain discharge voltage pulses for performing sustain discharge to the X electrode and the Y electrode during a first period, respectively;

While a sustain discharge pulse is applied to the X electrode and the Y electrode, a first scan pulse is applied to the first M electrode corresponding to the X electrode, and a second scan pulse is applied to the second M electrode corresponding to the Y electrode. An M electrode driver for applying; And

And a control unit for supplying a control signal to the address driver, the X electrode driver, the Y electrode driver, and the M electrode driver.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

6 illustrates an electrode arrangement diagram of a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 6, in the plasma display device according to the exemplary embodiment of the present invention, the address electrodes A1 to Am are arranged in parallel in the column direction, and the Y electrodes Y1 to Y _n of n / 2 + 1 rows are arranged. _{/ 2 + 1} ), X electrodes (X1 to X _{n / 2 + 1} ), and middle electrodes (hereinafter, referred to as 'M electrodes') of n rows are arranged. That is, according to the embodiment of the present invention, the M electrode is arranged in the middle of the Y electrode and the X electrode, and the Y electrode, the X electrode, the M electrode, and the address electrode have a four-electrode structure in which one discharge cell 30 is formed. .

At this time, according to the embodiment of the present invention, the X electrode and the Y electrode serve as an electrode for applying a sustain discharge pulse, and the M electrode serves for applying a reset waveform and a scan pulse.

7 is a perspective view of a plasma display panel according to an embodiment of the present invention, and FIG. 8 is a cross-sectional view of the plasma display panel shown in FIG.

7 and 8, a plasma display panel according to an exemplary embodiment of the present invention includes a first substrate 41 and a second substrate 42. The X electrode 53 and the Y electrode 54 are formed on the first substrate 41. In addition, a bus electrode 46 is formed on the X electrode 53 and the Y electrode 53. The dielectric layer 44 and the passivation layer 45 are sequentially formed on the X and Y electrodes 53 and 54.

Meanwhile, an address electrode 55 is formed on the surface of the second substrate 42, and a dielectric layer 44 ′ is formed on the address electrode 55. The partition wall 47 is formed on the dielectric layer 44 ′ to form a cell 49 that is a discharge space between the partition walls 47. Phosphor 48 is applied to the surface of the partition wall 47 in the cell space between the partition walls 47. The X and Y electrodes 53 and 54 are formed at right angles to the address electrode 55.

In this case, according to the exemplary embodiment of the present invention, the intermediate electrode 56 is formed between the pair of X electrodes 53 and the Y electrodes 54 formed on the surface of the first substrate 41. As described above, a reset waveform and a scan pulse are mainly applied to this intermediate electrode. The bus electrode 46 is formed on the intermediate electrode 56.

The plasma display panel according to the exemplary embodiments of the present invention shown in FIGS. 5 to 7 has a structure in which intermediate electrodes are disposed between Xi and Y _i electrodes and between Y _i and X _{i + 1} electrodes. That is, when there are n / 2 + 1 X electrode and Y electrode, the structure with n M electrodes is shown. However, the M electrode 56 may exist only between the X _i electrode 53 and the Y _i electrode 54, and there may be an electrode arrangement in which no M electrode exists between the Y _i electrode and the X _{i + 1} electrode. In this case, the number of X electrodes, Y electrodes, and M electrodes is equal to n.

FIG. 9 is an AWD driving waveform diagram according to an embodiment of the present invention, and FIG. 10 is a diagram showing wall charge distribution according to the driving waveform shown in FIG. 9.

Hereinafter, an AWD driving method according to an embodiment of the present invention will be described with reference to FIGS. 9 and 10.

As shown in FIG. 9, according to the driving method according to the exemplary embodiment of the present invention, a sustain discharge pulse is applied to the X electrode and the Y electrode in all sections, and a reset waveform and a scan pulse are applied to the M electrode. As described above, according to the embodiment of the present invention, since only the sustain discharge pulse is applied to the Y electrode and it is not necessary to apply the scan pulse or the reset waveform, the circuit of the Y electrode can be simplified as compared with the conventional AWD driving. In addition, according to the embodiment of the present invention, since the same sustain discharge pulse is applied to the X electrode and the Y electrode, the X electrode and the Y electrode driving circuit can be symmetrically configured to match the circuit impedance.

According to the AWD driving method according to the embodiment of the present invention, the X electrode, the Y electrode, the M electrode, and the address electrode forming one discharge cell include a reset period, an address period, and a sustain period.

(1) Reset section (I)

This section erases the wall charges formed by the sustain discharge pulses applied to the previous X electrode and the Y electrode, and serves to stabilize the state of the cell.

According to the embodiment of the present invention shown in FIG. 9, the potential of the M electrode is lowered to the ramp waveform to dissipate the wall charges formed by the sustain discharge pulse on the X electrode and the Y electrode. At this time, according to the embodiment of the present invention, a reset waveform is simultaneously applied to a predetermined number of M electrodes (three in FIG. 9). That is, according to the embodiment of the present invention, while the sustain discharge pulse is applied to the X electrode and the Y electrode, a waveform (ramp waveform in FIG. 9) that gradually decreases from the voltage Vm to the ground voltage is applied to the M electrode. And the wall charge of the Y electrode is quenched in a stable form.

(2) Address section (II)

In the address period, scan pulses are sequentially applied to the M electrodes while the plurality of M electrodes are biased to the Vsc voltage, and a scan pulse is applied to the M electrodes. Apply an address voltage to the cell). Then, discharge occurs between the M electrode and the address electrode, and the discharge extends to the X electrode and the Y electrode.

According to an embodiment of the present invention, the time when the sustain discharge pulse is applied to the X electrode (hereinafter referred to as 'X drive pulse on time') and the time when the sustain discharge pulse is applied to the Y electrode (hereinafter 'Y drive pulse on time' Since the scan pulse can be applied to all of them, the time width of the scan pulse relative to the conventional one can be increased. In FIG. 9, the pulse applied to the M electrode during the X driving pulse on time is described as SPx, and the pulse applied to the M electrode during the Y driving pulse on time is described as SPy. As described above, according to the embodiment of the present invention, since the time width of the scan pulse can be increased as compared with the conventional AWD driving method, an accurate address operation can be performed.

On the other hand, according to the AWD driving method according to an embodiment of the present invention, although not clearly shown in Fig. 9, while the address discharge is performed between the M electrode and the address electrode between the specific X electrode and the Y electrode and other X electrode and The sustain discharge pulse is applied to the Y electrode to perform the sustain discharge operation.

(3) Maintenance discharge section (Ⅲ)

According to the sustain discharge section according to the embodiment of the present invention, the sustain discharge voltage pulse is alternately applied to the X electrode and the Y electrode while the M electrode is biased at the sustain discharge voltage Vm. The sustain discharge occurs in the discharge cells selected in the address section through the application of such a voltage.

At this time, according to the embodiment of the present invention, the discharge is caused by different discharge mechanisms at the initial and the normal time of the sustain discharge. For convenience of explanation, hereinafter, the discharge generated at the beginning of the sustain discharge is referred to as a short-gap discharge section, and the discharge at the normal time point is referred to as a long-gap discharge section.

(3-1) Short gap discharge section

In the start period of sustain discharge, as shown in Figs. 10A and 10B, a positive voltage pulse is applied to the X electrode (or the Y electrode) and a negative voltage is applied to the Y electrode (or the X electrode). A pulse is applied (where the signs of + and-are relative concepts comparing the magnitude of the voltage applied to the X electrode and the voltage applied to the Y electrode, meaning that the + pulse voltage is applied to the X electrode, This means that a larger voltage than the electrode is applied.) At the same time, a positive voltage pulse is applied to the M electrode. Therefore, unlike the conventional case where the discharge occurs only between the X electrode and the Y electrode, the discharge occurs between the X electrode / M electrode and the Y electrode. In particular, according to the embodiment of the present invention, since the distance between the M electrode and the Y electrode is closer than the distance between the X electrode and the Y electrode, the electric field applied between the M electrode and the Y electrode becomes larger. Therefore, the discharge between the M electrode and the Y electrode plays a dominant role than the discharge between the X electrode and the Y electrode. As described above, in the embodiment of the present invention, since the discharge between the M electrode and the Y electrode having a relatively short distance at the beginning of the sustain discharge plays a dominant role, it is called a short gap discharge.

As described above, according to the embodiment of the present invention, since a short gap discharge occurs by applying a relatively high electric field at the initial stage of sustain discharge, sufficient priming particles in the discharge cell are applied when the first sustain discharge pulse is applied after the address period. Even if it is not produced, sufficient discharge can be performed.

(3-2) Long gap discharge section

After application of the first sustain discharge pulse of sustain discharge, since the voltage of the M electrode is biased to a constant voltage (V _M ), the discharge between the M electrode and the X electrode or the discharge between the M electrode and the Y electrode (ie, a short gap discharge) ) Contributes little to the discharge, so that the main discharge becomes a discharge between the X electrode and the Y electrode, so that an image inputted by the number of discharge pulses applied alternately to the X electrode and the Y electrode can be displayed.

That is, as shown in FIG. 10 (d), in the steady discharge region in the steady state, negative wall charges continuously accumulate on the M electrode, and negative wall charges and positive walls alternately on the X electrode and the Y electrode. Charges accumulate.

As described above, according to the exemplary embodiment of the present invention, since the discharge is performed by the short gap discharge of the X electrode and the M electrode (or between the Y electrode and the M electrode) at the initial stage of the sustain discharge, sufficient discharge is performed even in a state where the priming particles are small. In the state, since the discharge is performed by the long gap discharge between the X electrode and the Y electrode, stable discharge can be performed.

11 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 11, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, an address driver 200, a Y electrode driver 300, an X electrode driver 400, and an M electrode driver ( 500 and the control unit 600.

The plasma display panel 100 includes a plurality of address electrodes A1 to Am arranged in the column direction, a plurality of Y electrodes Y1 to Yn arranged in the row direction, X electrodes X1 to Xn, and M _ij electrodes. It includes. In this case, the M _ij electrode refers to an electrode formed between the Y _i electrode and the X _j electrode.

The address driver 200 receives an address driving control signal S _A from the controller 600 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode.

The Y electrode driver 300 receives the Y electrode driving signal S _Y from the controller 600 and applies the waveform shown in FIG. 9 to the Y electrode.

The X electrode driver 400 receives the electrode drive signal S _X from the controller and applies the waveform shown in FIG. 9 to the X electrode.

The M electrode driver 500 receives the M electrode driving signal S _M from the controller 600 and applies the corresponding waveform shown in FIG. 9 to the M electrode.

The controller 600 receives an image signal from the outside and generates an address driving control signal S _A , a Y electrode driving signal S _Y , an X electrode driving signal S _X , and an M electrode driving signal S _M. do.

As described above, according to the exemplary embodiment of the present invention, sustain discharge pulses are alternately applied to the X electrode and the Y electrode during all sections, and scan pulses are applied to the M electrode during the X driving pulse on time and the Y driving pulse on time. Since the width of the scan pulse is increased, stable address operation can be performed.

Further, according to the embodiment of the present invention, since the voltage waveforms which are substantially symmetrical are applied to the X electrode and the Y electrode, the circuits for driving the X electrode and the Y electrode can be designed almost identically. Therefore, since the difference in circuit impedance between the X electrode and the Y electrode can be almost eliminated, it is possible to reduce the distortion of the pulse waveform applied to the X electrode and the Y electrode in the sustain discharge section, thereby achieving stable discharge.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various other modifications and changes are possible.

As described above, according to the present invention, since the reset or the address discharge are performed using the intermediate electrode, discharge failure can be prevented at the same time as performing the correct address.

1 is a partial perspective view of an AC plasma display panel.

2 is an arrangement diagram of electrodes of a plasma display panel.

3 is a diagram illustrating a general ADS driving method.

4 is a diagram illustrating a general AWD driving method.

5 is a view showing a conventional AWD driving method.

6 is an electrode array diagram of a plasma display panel according to an exemplary embodiment of the present invention.

7 and 8 illustrate a plasma display panel according to an exemplary embodiment of the present invention.

9 is a view showing an AWD driving method of a plasma display panel according to an embodiment of the present invention.

FIG. 10 shows a wall charge distribution diagram when the waveform shown in FIG. 9 is applied.

11 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

Claims (8)

A first electrode and a second electrode to which a sustain discharge pulse is applied, an intermediate electrode formed between the first electrode and the second electrode, and a third electrode intersecting the first, electrode, second electrode, and intermediate electrode. In the driving method of the plasma display device, (a) alternately applying a sustain discharge pulse to the first electrode and the second electrode during a first period; And (b) applying a first scan pulse to a first intermediate electrode corresponding to the first electrode and applying a second scan pulse to a second intermediate electrode corresponding to the second electrode during a portion of the first interval; And applying an address voltage to the third electrode. The method of claim 1, (a) before the step (b), applying a reset waveform that falls from a first voltage to a second voltage to the intermediate electrode. The method of claim 1, And the reset waveform is applied to the intermediate electrode over a plurality of sustain discharge pulses applied to the first electrode or the second electrode. The method according to any one of claims 1 to 3, The first electrode, the second electrode, the intermediate electrode and the third electrode are each plural, and the first electrode, the second electrode, the intermediate electrode and the third electrode corresponding to each other form one discharge cell, While the scan pulse is applied to the intermediate electrode constituting the j th discharge cell and the address operation is performed, the sustain discharge pulse is applied to the first electrode or the second electrode constituting the m th discharge cell. A method of driving a plasma display device. The method of claim 1, And a waveform applied to the first electrode and the second electrode in all sections. A plasma display including an X electrode and a Y electrode to which sustain discharge voltage pulses are respectively applied, and an M electrode formed between the X electrode and the Y electrode, and an address electrode insulated from and crossing the X electrode, the Y electrode, and the M electrode; panel; An address driver for applying a display data signal for selecting a discharge cell to the address electrode; An X electrode driver and a Y electrode driver for applying sustain discharge voltage pulses for performing sustain discharge to the X electrode and the Y electrode during a first period, respectively; While a sustain discharge pulse is applied to the X electrode and the Y electrode, a first scan pulse is applied to the first M electrode corresponding to the X electrode, and a second scan pulse is applied to the second M electrode corresponding to the Y electrode. An M electrode driver for applying; And And a controller for supplying control signals to the address driver, the X electrode driver, the Y electrode driver, and the M electrode driver. The method of claim 6, The M electrode driver And applying a reset waveform that falls from the first voltage to the second voltage to the intermediate electrode before the scan pulse is applied. The method of claim 6, And the M electrode driver applies a reset waveform to the M electrode over a plurality of sustain discharge pulses applied to the X electrode or the Y electrode.