KR100747176B1 - Plasma Display Apparatus and Driving Method there of - Google Patents

Abstract

The present invention relates to a plasma display device, and more particularly, to a plasma display device and a driving method thereof capable of preventing circuit damage and improving driving reliability.

The plasma display device according to the present invention is formed on a plasma display panel including a data electrode, a voltage source for supplying a voltage to the data electrode, and a path from which the voltage is supplied to the data electrode. And a voltage increase controller controlling to gradually increase in a plurality of steps.

Description

Plasma Display Apparatus and Driving Method there of}

1 is a view for explaining an example of a conventional plasma display panel structure.

2 is a diagram showing a data voltage waveform by supplying a conventional data voltage.

3 shows an example of the plasma display device of the present invention;

4 is a diagram showing an example of a driving method of the plasma display device of the present invention;

5 is a view showing an example of a drive waveform according to the driving method of the plasma display device of the present invention.

6 is a view showing an embodiment of a data driver in the plasma display device of the present invention.

7 is a diagram illustrating a data voltage waveform according to the embodiment of the present invention of FIG. 6.

8 illustrates switch timing according to an embodiment of the present invention of FIG.

***** Explanation of symbols for main parts of drawing *****

300: plasma display panel 321: control unit

322: data driver 323: scan driver

324: sustain driver 325: drive voltage generator

The present invention relates to a plasma display device, and more particularly, to a plasma display device and a driving method thereof for preventing noise of a voltage waveform to improve reliability of a driving circuit.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form a unit discharge cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He). An inert gas containing a main discharge gas such as and a small amount of xenon is filled. A plurality of unit discharge cells described above are gathered to form one pixel. For example, a red (R) cell, a green (G) cell, and a blue (B) cell may form one pixel. When a high frequency voltage is applied to such a unit discharge cell to discharge, an inert gas generates vacuum ultra violet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration.

1 is a view for explaining an example of a conventional plasma display panel structure.

As illustrated in FIG. 1, a conventional plasma display panel includes a plurality of scan electrodes 102 and Y formed in pairs on a front substrate 101, which is a display surface on which an image is displayed. The front panel 100 in which the storage electrode pairs are arranged, and the rear panel 110 in which the plurality of data electrodes 113 and X are arranged so as to intersect the plurality of storage electrode pairs described above are formed on the rear substrate 111 forming the rear surface. Combined in parallel with a distance between them.

The front panel 100 is, for example, a scan electrode 102 and Y and a sustain electrode 103 and Z for mutual discharge in one discharge cell and maintaining light emission of the cell, that is, a transparent electrode formed of a transparent ITO material. And a pair of scan electrodes 102 and Y and sustain electrodes 103 and Z provided as a bus electrode b made of a metal material. Scan electrodes 102 and Y and sustain electrodes 103 and Z are covered by one or more upper dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and discharge on top of upper dielectric layer 104. In order to facilitate the condition, a protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

For example, the rear panel 110 may be arranged such that a plurality of discharge spaces, that is, partitions 112 of a stripe type (or well type) for forming the discharge cells are parallel to each other. In addition, a plurality of data electrodes 113 and X for performing address discharge to generate vacuum ultraviolet rays are disposed in parallel with the partition wall 112. On the upper side of the rear panel 110, R, G, and B phosphors 114 which emit visible light for image display during address discharge are coated. A lower dielectric layer 115 is formed between the data electrodes 113 and X and the phosphor 114 to protect the data electrodes 113 and X.

The front panel 100 and the rear panel 110 formed as described above are bonded to each other through a sealing process to form a plasma display panel. In addition, a plasma display panel is provided with a driving unit for driving electrodes such as scan electrodes 102 and Y, sustain electrodes 103 and Z, and data electrodes 113 and X. Make up the device.

The above-described driving unit supplies a predetermined driving voltage to the plurality of electrodes to generate a discharge to display an image.

In this case, the voltage waveform supplied by the driver to the electrode is substantially noisy. Here, the data voltage waveform supplied to the data electrode, which is an example of the driving voltage supplied by the driver, is as follows.

2 is a view showing a data voltage waveform by supplying a conventional data voltage.

As illustrated in FIG. 2, the waveform of the data voltage supplied to the data electrode X by the data driver is shown. Here, the data driver for driving the data electrode X is vulnerable to heat, which is a driving signal output unit for controlling the supply of the data voltage to the data electrode X, for example, a data driver IC. It is further deepened according to the operation of the switching element included in).

That is, such data driver ICs generally operate at high speeds over several tens of MHz, and in particular, the output waveform of the data driver ICs is directly connected to a voltage source. There is a problem that the phenomenon is intensified. As the voltage waveform appears above the rated voltage, the damage of the data driver integrated circuit is further accelerated and eventually destroyed, thereby increasing the burden of increasing the demand for after-sales service.

In addition, the noise of the waveform is intensified, thereby lowering the reliability of the driving, and also deteriorating the characteristics of the electromagnetic interference (EMI) due to the sudden voltage rise.

SUMMARY OF THE INVENTION In order to solve such a problem, an object of the present invention is to provide a plasma display device and a driving method thereof, which can prevent a phenomenon in which a driving waveform appears above a rated voltage.

In addition, another object of the present invention is to provide a plasma display device and a driving method thereof that can improve driving reliability by a stable voltage supply.

Further, another object of the present invention is to provide a plasma display device and a driving method thereof capable of improving the characteristics of electromagnetic interference (EMI).

The technical problem of the present invention is not limited to the above-mentioned thing, and another technical problem to be achieved by the present invention will be clearly understood by those skilled in the art by the effect of the configuration of the present invention.

A plasma display device according to the present invention for achieving the above object is a plasma display panel including a data electrode, a voltage source for supplying a voltage to the data electrode and on the path from which the voltage source is supplied to the data electrode And a voltage increase controller configured to control the waveform of the voltage to increase gradually in a plurality of steps.

The apparatus may further include a driving signal output unit controlling a voltage supply to the data electrode, wherein the voltage increase controller is formed between the paths through which the voltage is supplied from the voltage source to the driving signal output unit.

In addition, the voltage increase controller is characterized in that it comprises a plurality of switches connected in parallel.

In addition, the current capacity of the plurality of switches of the voltage increase controller is smaller than the current capacity of the drive signal output unit.

In addition, the voltage increase controller is characterized by consisting of a first switch and a second switch.

In addition, when the voltage is supplied to the data electrode, the voltage rises to a first voltage level through a path formed by an on state of the first switch, and the on state of the second switch is changed from the first voltage level. It is characterized by raising to the data voltage level by the path formed by.

In addition, the current capacity of the second switch is characterized in that less than the current capacity of the first switch.

The first voltage level is 60% or more and 90% or less of the data voltage level.

In addition, the first switch is maintained in an on state before the voltage is supplied to the data electrode.

In addition, after the voltage rises to the data voltage, the first switch and the second switch may be turned on.

In the method of driving a plasma display device including a data electrode according to the present invention for achieving the above object, the voltage supplied to the data electrode is gradually raised in a plurality of steps through a path formed by a plurality of switches connected in parallel. Do it.

The apparatus may further include a driving signal output unit controlling a voltage supply to the data electrode, wherein the plurality of switches are formed on a path through which the voltage is supplied to the driving signal output unit.

In addition, the current capacity of the plurality of switches is characterized in that less than the current capacity of the drive signal output unit.

In addition, the plurality of switches is characterized in that consisting of a first switch and a second switch.

In addition, in the first step of increasing the voltage supplied to the data electrode to the first voltage level in the path formed by the on state of the first switch, the on state of the second switch at the first voltage level It characterized in that it comprises a two steps to rise to the data voltage level in the path formed by.

In addition, the voltage rising slope of the second step is characterized in that it is gentler than the voltage rising slope of the first step.

In addition, the current capacity of the second switch is characterized in that less than the current capacity of the first switch.

The first voltage level is 60% or more and 90% or less of the data voltage level.

In addition, the first switch is maintained in an on state before the voltage is supplied to the data electrode.

In addition, after the voltage rises to the data voltage, the first switch and the second switch may be turned on.

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

3 is a view showing an example of the plasma display device of the present invention.

As shown in FIG. 3, the plasma display apparatus according to the present invention provides data to the plasma display panel 300 and the data electrodes X1 to Xm formed on the lower substrate (not shown) of the plasma display panel 300. A data driver 322 for supplying, a scan driver 323 for driving the scan electrodes Y1 to Yn, a sustain driver 324 for driving the sustain electrodes Z which are common electrodes, and And a control unit 321 for controlling the driving units of the driving unit, and a driving voltage generation unit 325 for supplying driving voltages required for the driving units 322, 323, and 324.

The plasma display panel 300 is bonded to the upper substrate (not shown) and the lower substrate (not shown) at regular intervals, and a plurality of electrodes, for example, the scan electrodes Y1 to Yn and the sustain electrode, are, for example, attached to the upper substrate. (Z) is formed in pairs, and the data electrodes X1 to Xm are formed on the lower substrate to intersect the scan electrodes Y1 to Yn and the sustain electrode Z.

A method of driving such a plasma display device will be described first with reference to FIG. 4.

4 is a view showing an example of a driving method of the plasma display device of the present invention.

As shown in FIG. 4, in order to implement an image on the plasma display panel, the plasma display apparatus of the present invention may be driven by dividing one frame into a plurality of subfields. That is, each subfield may be driven by being divided into a reset period for initializing all cells, an address period for selecting a cell to be discharged, and a sustain period for implementing gray levels according to the number of discharges.

Referring again to the example of the plasma display device of FIG. 3 in the driving method thus driven, the scan driver 323 is in the wall charge state of all the discharge cells in the previous subfield during the reset period under the control of the controller 321. A reset pulse, for example, a rising ramp waveform Ramp_up and a falling ramp waveform Ramp_down, is supplied to the scan electrodes Y1 to Yn.

Further, under the control of the control unit 321, the scan driver 323 maintains the scan pulse of the scan voltage (-Vy), for example, while maintaining the scan bias voltage Vsc during the address period in order to select a discharge cell that is turned on in the sustain period. The scan electrodes Y1 to Yn are sequentially supplied.

Further, under the control of the control unit 321, the scan driver 323 may alternately apply a sustain pulse to the sustain pulse supplied by the sustain driver 324, which will be described later, to generate sustain discharge.

The data driver 322 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like not shown, and then data mapped to each subfield is supplied by the subfield mapping circuit. The data driver 322 samples and latches data in response to the timing control signal CTRX from the controller 321, and then supplies the data to the data electrodes X1 to Xm. At this time, the discharge cells that are turned on according to the above-described data, that is, the cells which cause the sustain discharge, which is the display discharge, are selected in the sustain period.

For example, during the address period, the data driver 322 supplies the data pulses Va to the data electrodes X1 to Xm so that the data driver 322 is synchronized with the above-described scan pulses during the address period. When the sustain pulse is applied to the discharge cell supplied with the data pulse in the sustain period, which will be described later, wall charges such that sustain discharge is generated are formed.

Here, the plasma display device of the present invention can control the step of the voltage supplied differently from the conventional. For example, in a voltage source for supplying a predetermined voltage, a voltage increase controller may be formed on a path through which the voltage is supplied to the electrode, thereby increasing the voltage in a plurality of steps. do.

The sustain driver 324 supplies the positive voltage Vz to the sustain electrodes Z during the address period or during the address period in the set-down period of the reset period under the control of the control unit 321. Such a positive voltage Vz can be set equal to the voltage level Vs of the sustain pulse, for example.

In addition, as described above, the sustain driver 324 operates the sustain driving circuit provided therein alternately with the sustain driving circuit provided in the scan driver 323 to sustain the sustain pulse Vs. Will be supplied to

The control unit 321 receives the vertical / horizontal synchronization signal and the clock signal and receives timing control signals for controlling the operation timing and synchronization of the driving units 322, 323, and 324 in the reset period, the address period, and the sustain period. Each driver is controlled by generating CTRX, CTRY, and CTRZ and supplying the timing control signals CTRX, CTRY, and CTRZ to the corresponding drivers 322, 323, and 324.

The data control signal CTRX includes a sampling clock for sampling data, a latch control signal, a switch control signal for controlling on / off time of the sustain driving circuit and the driving switch element. The scan control signal CTRY includes a switch control signal for controlling the on / off time of the sustain driving circuit in the scan driver 323 and the driving switch element, and the sustain control signal CTRZ includes the sustain in the sustain driver 324. A switch control signal for controlling the on / off time of the driving circuit and the driving switch element is included.

The driving voltage generator 325 generates a setup voltage Vsetup, a scan common voltage Vsc, a scan voltage -Vy, a sustain voltage Vs, a data voltage Va, and the like. These driving voltages may vary depending on the composition of the discharge gas or the structure of the discharge cell.

The configuration of the plasma display device of the present invention described above is an embodiment for the convenience of understanding, and the configuration of the present invention is not limited thereto. That is, even if the configuration and operation of the driving apparatus are somewhat varied, it is considered that the present invention is included if the configuration of the voltage increase controller which raises the voltage of the present invention in a plurality of steps is the same.

An example of the driving waveform implemented by the plasma display apparatus of the present invention is as shown in FIG. 5.

5 is a diagram showing an example of a driving waveform according to the driving method of the plasma display device of the present invention.

As shown in FIG. 5, the plasma display apparatus divides a frame of a screen into a plurality of subfields, for example, a reset period for initializing all of the subfields, and an address period for selecting cells to be discharged. The drive is divided into a sustain period for maintaining the discharge of the selected cell. In addition, an erasing period for erasing wall charges in the discharged cell may be added and driven as necessary.

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

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

In the address period, the negative scan pulse -Vy is sequentially applied to the scan electrodes, and the positive data pulse Va is applied to the data electrodes in synchronization with the scan pulse. As the voltage difference between the scan pulse -Vy and the data pulse Va and the wall voltage generated in the reset period are added, an address discharge is generated in the discharge cell to which the data pulse Va is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied.

This address discharge is caused by the above-described data pulse Va. That is, the above-described scan pulse is sequentially applied to all the discharge cells, but the data pulse is applied only to the discharge cells to generate the sustain discharge, which is the display discharge, so that the discharge cells to be turned on can be selected.

Here, the driving method of the plasma display device of the present invention is different from the driving method of the data voltage. That is, a plurality of switches connected in parallel are formed on a path through which the data voltage is supplied to control the data voltage to rise in a plurality of steps. A detailed driving method thereof will be described below with reference to FIG. 7.

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

After the sustain discharge is completed, if an erase period for erasing wall charges in the discharged cell is added and driven, an erase ramp waveform (Ramp-ers) having a small pulse width or voltage level is supplied to the sustain electrode in the erase period. It will erase the wall charge remaining in the cells of the screen.

An example of the driving waveform described above is one example of the peripheral configuration to help the understanding of the configuration of the present invention. It is noted that the driving method of the present invention is not limited to this driving method. That is, even if the configuration of the waveforms is different, it is significant that the present invention is included if the method of driving the data voltages described later is the same.

Hereinafter, a driving device and a driving method of a data electrode for changing a method of supplying a characteristic voltage, for example, a data voltage, of the present invention will be described in more detail with reference to the accompanying drawings.

6 is a diagram illustrating an embodiment of a data driver in a plasma display device of the present invention.

As shown in FIG. 6, in the plasma display apparatus of the present invention, the data driver includes, for example, a voltage source 600, a voltage increase controller 610, and a driving signal output unit 620.

The voltage source 600 supplies the data electrode X with a data voltage Va for selecting a driving voltage, for example, a discharge cell that is turned on in an address period.

The driving signal output unit 620 controls the supply of voltage to the data electrode X through push / pull type switches. The driving signal output unit 620 may be formed in the form of a driver integrated circuit (IC) to control the voltage supply. That is, in order to output the data signal stored in the shift register of the driver integrated circuit IC to the panel Cp by the strobe signal, the voltage is supplied to the data electrode X according to the data signal. Will be done.

Here, according to the present invention, a voltage increase controller 610 for controlling a data voltage waveform is formed on a path through which a predetermined voltage, for example, a data voltage, is supplied from the voltage source 600.

The voltage increase controller includes a plurality of switches formed in parallel between the paths of the voltage source 600 and the driving signal output unit 620 and connected in parallel to form a path for supplying data voltages as many as the number of switches. Can be supplied as You can also adjust the slope according to the current capacity of the switch. Here, the voltage increase controller 610 of the present invention may be formed as a field effect transistor (FET) device as an example.

In addition, as shown in FIG. 6, a detailed configuration of one embodiment of the present invention includes two switches, that is, a first switch Q1 and a second switch Q2. ) Can be configured. The first switch Q1 and the second switch Q2 have a smaller current capacity than elements formed in the driving signal output unit 620 to smooth the speed at which the voltage is supplied, that is, the slope of the voltage waveform. Can be reduced more effectively.

Looking at the voltage waveform implemented by the embodiment of the present invention of Figure 6 as shown in FIG.

7 is a diagram illustrating a data voltage waveform according to an exemplary embodiment of the present invention of FIG. 6.

As shown in FIG. 7, the data voltage Va supplied by the data driver of the present invention first rises to the first voltage level V1 by the path of the first switch Q1 of FIG. The data voltage level Va rises from the voltage level V1 to the path of the second switch Q2. By dividing and supplying a section in which the voltage rises, the voltage waveform can be prevented from suddenly rising or distorted, and the noise of the waveform can also be suppressed.

Here, in particular, the slope of the voltage waveform of the sections t1 to t2 that rises from the first voltage level V1 to the data voltage level Va is gentler than the sections t0 to t1 that rise to the first voltage level V1. Therefore, the overshoot phenomenon that occurs when suddenly rising to the data voltage level Va can be prevented. This can also prevent circuit damage.

Here, the tilt can be adjusted in various ways. For example, the section t1 that rises from the first voltage level V1 to the data voltage level Va than the current capacity of the first switch Q1 used in the sections t0 to t1 that rise to the first voltage level V1. The voltage supply speed can be reduced by making the current capacity of the second switch Q2 used for ˜t2) smaller.

In addition, the first voltage level V1 is set to a level higher than half of the data voltage level Va so that the first voltage level V1 is higher than the periods t0 to t1 that rise to the first voltage level V1. The slope of the voltage waveform in the sections t1 to t2 rising from the data voltage level Va can be more effectively and gently adjusted. Accordingly, it is possible to more effectively suppress the overshoot phenomenon near the data voltage level Va and to supply an ideal waveform with reduced noise.

As described above, a switch timing diagram of the voltage increase controller 610 according to an embodiment of the present invention of FIG. 6 that implements the stable waveform of FIG. 7 will be described with reference to FIG. 8.

8 is a diagram illustrating switch timing according to an exemplary embodiment of the present invention of FIG. 6.

As shown in FIG. 8, when a strobe signal is applied at time t0 to output a data signal for supplying a data voltage, the data voltage Va may be supplied to the path by the first switch Q1. One switch Q1 is kept in an on state. Accordingly, the first switch Q1 is supplied to the first voltage level V1 of FIG. 7 in the period t0 to t1 through the first path formed by the first switch Q1.

Thereafter, the first switch Q1 is turned off at the time t1 and the second switch Q2 is turned on to turn on the data through the second path by the second switch Q2. Supply up to the voltage level Va. That is, the voltage waveform rises from the first voltage level V1 raised by the above-described first path to the data voltage level Va.

As such, after the voltage waveform rises to the data voltage level Va, both the first switch Q1 and the second switch Q2 are turned on to maintain the data voltage after the t2 period. The reason why the data voltages are supplied by turning on all the switches as described above is to reduce the voltage drop caused by the switches to obtain the desired data voltage Va closer to the ideal value.

Through the above configuration, the noise of the voltage waveform, that is, the shape of the rated voltage or more is prevented from appearing, thereby reducing the thermal burden of the circuit and increasing the reliability of the circuit operation. In addition, by implementing accurate waveforms, the impact of the device can be minimized to reduce manufacturing costs, and the cost allocated to after-sales (A / S) can be reduced.

In addition, there is an effect that can reduce to the phenomenon of electromagnetic interference (Electro Magnetic Interference "EMI") that increases as the voltage changes rapidly.

In addition, this invention is not limited to the structure of the above-mentioned embodiment. In other words, it is considered that the present invention is included in the present invention if the supply path of the data voltage is divided and supplied to the circuit.

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 following claims rather than the detailed description, and the meaning and scope of the claims 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 above, the plasma display device and the driving method thereof of the present invention have the effect of suppressing the overshoot phenomenon of the voltage waveform.

In addition, the plasma display device and its driving method of the present invention have the effect of reducing the noise of the waveform to improve the reliability of the circuit operation.

In addition, the plasma display device and the driving method thereof of the present invention have the effect of protecting the circuit elements.

In addition, the plasma display device and the driving method thereof of the present invention have the effect of preventing the electromagnetic interference (EMI) phenomenon.

Claims (20)

A plasma display panel including a data electrode; A voltage source supplying a voltage to the data electrode; And A voltage rising controller formed on a path through which the voltage is supplied from the voltage source to the data electrode and controlling the waveform of the voltage to gradually rise in a plurality of steps; Plasma display device comprising a. The method of claim 1, A driving signal output unit for controlling a voltage supply to the data electrode further comprises: And the voltage rising controller is formed between the paths through which the voltage is supplied from the voltage source to the driving signal output unit. The method of claim 1, The voltage rise controller includes a plurality of switches connected in parallel. The method of claim 2, And the current capacity of the plurality of switches of the voltage increase controller is smaller than the current capacity of the drive signal output unit. The method of claim 1, The voltage increase controller includes a first switch and a second switch. The method of claim 5, When the voltage is supplied to the data electrode, the voltage rises to a first voltage level in a path formed by the on state of the first switch, and the on state of the second switch is changed from the first voltage level. And increasing the voltage to the data voltage level through the formed path. The method of claim 6, And the current capacity of the second switch is smaller than the current capacity of the first switch. The method of claim 6, And the first voltage level is higher than a half level of the data voltage level. The method of claim 6, And the first switch maintains an on state before the voltage is supplied to the data electrode. The method of claim 6, And increasing both the first switch and the second switch to an on state after the voltage voltage rises to the data voltage. In the driving method of a plasma display device including a data electrode, And a voltage supplied to the data electrode to gradually increase in a plurality of steps through a path formed by a plurality of switches connected in parallel. The method of claim 11, And a driving signal output unit for controlling a voltage supply to the data electrode, wherein the plurality of switches are formed on a path through which the voltage is supplied to the driving signal output unit. The method of claim 11, And a current capacity of the plurality of switches is smaller than a current capacity of the driving signal output unit. The method of claim 11, And said plurality of switches comprises a first switch and a second switch. The method of claim 14, A first step of increasing the voltage supplied to the data electrode to the first voltage level in a path formed by an on state of a first switch; A step of rising to a data voltage level in a path formed by the on state of the second switch at the first voltage level; Method of driving a plasma display device comprising a. The method of claim 15, And the voltage rising slope of the second step is gentler than the voltage rising slope of the first step. The method of claim 15, And the current capacity of the second switch is smaller than the current capacity of the first switch. The method of claim 15, And the first voltage level is higher than a half level of the data voltage level. The method of claim 15, And the first switch maintains an on state before the voltage is supplied to the data electrode. The method of claim 15, And driving both the first switch and the second switch to an on state after the voltage voltage rises to the data voltage.

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