KR20060067278A - Method of driving plasma display panel - Google Patents

Abstract

The present invention relates to a method of driving a plasma display panel that can prevent cell erasing and false discharge due to crosstalk.

The driving method of the plasma display panel according to the present invention includes a scan electrode, a sustain electrode and an address electrode, and electrodes formed in vertically adjacent discharge cells are arranged in the order of sustain electrode, scan electrode, scan electrode, and sustain electrode. A method of driving a plasma display panel which is divided into a plurality of subfills and each subfield is divided into a reset period, an address period, and a sustain period, wherein the sustain pulses are supplied to the scan electrodes and the sustain electrodes during the sustain period. Applying alternately to; After the sustain pulses are finally applied to the sustain electrodes, the scan electrodes are divided into a radix group and an even group to generate pulses having a predetermined voltage difference so that the radix group and the even group have a predetermined voltage difference. Applying to even groups of scan electrodes.

Description

Driving method of plasma display panel {METHOD OF DRIVING PLASMA DISPLAY PANEL}             

1 is a perspective view showing a discharge cell structure of a conventional three-electrode AC surface discharge type plasma display panel.

2 and 3 are cross-sectional views of the discharge cells shown in FIG.

4 is a diagram illustrating an example of a luminance weight value of a subfield included in one frame.

5 is a waveform diagram illustrating a method of driving a conventional plasma display panel.

6 is a waveform diagram illustrating a method of driving another conventional plasma display panel.

FIG. 7 is a diagram illustrating a crosstalk phenomenon generated in an on cell and an off cell by the driving waveform shown in FIG. 6.

8 is a waveform diagram illustrating a method of driving a plasma display panel according to a first embodiment of the present invention.

9 is a waveform diagram illustrating a method of driving a plasma display panel according to a second embodiment of the present invention.

10 is a waveform diagram illustrating a method of driving a plasma display panel according to a third embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12Y, 12Z: transparent electrode

13Y, 13Z: bus electrode 14, 22: dielectric layer

16: protective film 18: lower substrate

24: partition 26: phosphor layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving a plasma display panel, and more particularly, to a method of driving a plasma display panel to prevent cell erasing and false discharge due to crosstalk.

Plasma Display Panels (hereinafter referred to as "PDPs") are characterized by emitting phosphors by 147 nm ultraviolet rays generated during discharge of an inert mixed gas such as He + Xe, Ne + Xe or He + Xe + Ne. An image containing graphics is displayed. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

1 is a perspective view showing a discharge cell structure of a conventional three-electrode alternating surface discharge type PDP.

Referring to FIG. 1, a discharge cell of a conventional three-electrode AC surface discharge type PDP includes a scan electrode Y and a sustain electrode Z formed on an upper substrate 10, and an address formed on a lower substrate 18. An electrode X is provided. Each of the scan electrode Y and the sustain electrode Z has a line width smaller than the line widths of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z, and is formed on one side edge of the transparent electrode 12Y and 12Z. 13Z).

The transparent electrodes 12Y and 12Z are usually formed on the upper substrate 10 by indium tin oxide (ITO). The metal bus electrodes 13Y and 13Z are usually formed of metals such as chromium (Cr) and formed on the transparent electrodes 12Y and 12Z to reduce voltage drop caused by the transparent electrodes 12Y and 12Z having high resistance. The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan electrode Y and the sustain electrode Z side by side. In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. The protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used.

The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode X is formed, and the phosphor layer 26 is coated on the lower dielectric layer 22 and the partition wall 24. The address electrode X is formed in the direction crossing the scan electrode Y and the sustain electrode Z. The partition wall 24 is formed in parallel with the address electrode X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert mixed gas is injected into the discharge space provided between the upper and lower substrates 10 and 18 and the partition wall 24.

In the conventional three-electrode surface discharge type PDP, the scan electrode Y and the sustain electrode Z are alternately formed on the upper substrate 10 as shown in FIG. 2, or adjacent to each other as shown in FIG. 3. Scan electrodes Y and sustain electrodes Z are formed adjacent to each other between discharge cells. Here, the upper substrate 10 shown in FIGS. 2 and 3 is rotated 90 degrees for comparison with the lower substrate 18.

The PDP is time-divisionally driven by dividing one frame into several subfields having different number of emission times in order to realize grayscale of an image. Each subfield is divided into a reset period for initializing the full screen, an address period for selecting a scan line and selecting a cell in the selected scan line, and a sustain period for implementing gray scale according to the number of discharges.

Here, the reset period is divided into a setup period in which the rising ramp waveform is applied and a set down period in which the falling ramp waveform is applied. For example, when the image is to be displayed in 256 gray levels, as shown in FIG. 4, the frame period (16.67 ms) corresponding to 1/40 second is divided into eight subfields SF1 to SF8. Each of the eight subfields SF1 to SF8 is divided into a reset period, an address period and a sustain period as described above. The reset period and the address period of each subfield are the same for each subfield, while the sustain period is increased at a rate of 2 ⁿ (n = 0,1,2,3,4,5,6,7) in each subfield. .

5 is a waveform diagram showing a conventional method for driving a PDP.

Referring to FIG. 5, the conventional driving method of the PDP is divided into a reset period for initializing the full screen, an address period for selecting a cell, and a sustain period for maintaining discharge of the selected cell.

In the reset period, the rising ramp waveform Ramp-up is applied to all the scan electrodes Y simultaneously. This rising ramp waveform (Ramp-up) causes a slight discharge in the cells of the full screen to generate wall charges in the cells. During the set-down period, after the rising ramp waveform Ramp-up is applied, the falling ramp goes from the positive sustain voltage (Vs) smaller than the peak voltage of the rising ramp waveform Ramp-up to negative polarity (-). Ramp-down is simultaneously applied to the scan electrodes (Y). Ramp-down generates weak erase discharges in the cells, eliminating unnecessary charges during wall charges and space charges generated by setup discharges, and uniformly distributing wall charges required for address discharges in the cells of the full screen. Will remain.

In the address period, a negative scan pulse Vscan is sequentially applied to the scan electrodes Y, and a positive data pulse data is applied to the address electrodes X. As the voltage difference between the scan pulse Vscan and the data pulse data and the wall voltage generated in the reset period are added, an address discharge is generated in the cell to which the data pulse data is applied. Wall charges are generated in the cells selected by the address discharge.

On the other hand, the positive sustain voltage Vs is applied to the sustain electrodes Z during the set down period and the address period.

In the sustain period, positive (+) sustain pulses (sus) are applied to the scan electrodes (Y) and the sustain electrodes (Z) alternately. Then, the cell selected by the address discharge is sustained in the form of surface discharge between the scan electrode (Y) and the sustain electrode (Z) whenever the sustain pulse (sus) is applied while the wall voltage and the sustain pulse (sus) in the cell are added. This will happen.

However, such a conventional PDP driving waveform consumes a lot of power because a rising ramp waveform Ramp-up having a high voltage value in each subfield needs to be applied to the scan electrodes Y. In addition, a large amount of light is generated by the rising ramp waveform Ramp-up applied to the scan electrode Y during the reset period, thereby reducing the contrast.

6 is a waveform diagram showing another conventional method of driving a PDP.

Referring to FIG. 6, in another conventional method of driving a PDP, one frame is driven by being divided into a plurality of subfields, each of which is a reset period for initializing cells of a full screen and an address period for selecting a cell. And a sustain period for maintaining the discharge of the selected cell.

During the setup period of the reset period of the first subfield in one frame, a rising ramp waveform Ramp-up, which rises up to the setup voltage Vsetup, is simultaneously applied to all the pre-scan poles Y. This rising ramp waveform (Ramp-up) causes a weak discharge (setup discharge) to occur in the cells of the full screen to generate wall charges in the cells. The rising ramp waveform Ramp-up is applied only to the first subfield SF1 of one frame. After the rising ramp waveform is applied, the ramp ramp ramps down from the positive sustain voltage (Vs), which is lower than the peak voltage of the ramp ramp, to the negative polarity (-). -down) is simultaneously applied to the scan electrodes Y during the setdown period during the reset period. Ramp-down generates weak erase discharges in the cells, eliminating unnecessary charges during wall charges and space charges generated by setup discharges, and uniformly distributing wall charges required for address discharges in the cells of the full screen. Will remain.

In the address period, a negative scan pulse scan is sequentially applied to the scan electrodes Y and a positive data pulse data is applied to the address electrodes X. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated during the reset period are added, an address discharge is generated in the cell to which the data pulse is applied. A predetermined wall charge is generated in the cells selected by the address discharge.

On the other hand, the positive sustain voltage Vs is applied to the sustain electrodes Z from the time when the falling ramp waveform Ramp-down is applied to the scan electrodes Y until the end of the address period.

In the sustain period, sustain pulses sus are alternately applied to the scan electrodes Y and the sustain electrodes Z. FIG. Then, the cell selected by the address discharge is in the form of surface discharge between the scan electrode Y and the sustain electrode Z each time the sustain pulse sus is applied while the wall voltage and the sustain pulse sus in the cell are added. Sustain discharge occurs. Here, the number of sustain pulses (sus) applied during the sustain period is set corresponding to the luminance weight of each frame.

During the sustain period, after the sustain pulse su is alternately applied to the scan electrodes Y and the sustain electrodes Z, the on-cell control pulse Vr having a voltage value smaller than the voltage value of the sustain pulse su is It is applied to the scan electrodes (Y). Accordingly, the last sustain discharge occurs in the discharge cells due to the on-cell control pulse Vr applied to the scan electrodes Y.

Subsequently, a falling ramp waveform Ramp-down, which descends from the base voltage to the negative polarity (−) during the reset period of the second subfield, is simultaneously applied to the scan electrodes Y. Ramp-down generates weak erase discharges in the cells, eliminating unnecessary charges during wall charges and space charges generated by setup discharges, and uniformly distributing wall charges required for address discharges in the cells of the full screen. Will remain.

On the other hand, off-cells in which sustain discharge is not generated in the first subfield maintain wall charges formed during the reset period of the first subfield. Therefore, the erase cells do not generate an erase discharge when a falling ramp waveform Ramp-down is supplied to the scan electrodes Y in the second subfield.

In the address period of the second subfield, a negative scan pulse scan is sequentially applied to the scan electrodes Y and at the same time a positive data pulse is applied to the address electrodes X. ) Is applied. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated during the reset period are added, an address discharge is generated in the cell to which the data pulse is applied. A predetermined wall charge is generated in the cells selected by the address discharge.

In the sustain period of the second subfield, a sustain pulse su is applied to the scan electrodes Y and the sustain electrodes Z alternately. Then, the cell selected by the address discharge is in the form of surface discharge between the scan electrode Y and the sustain electrode Z every time the sustain pulse sus is applied while the wall voltage and the sustain pulse sus in the cell are added. Sustain discharge occurs. Here, the number of sustain pulses (sus) applied during the sustain period is set corresponding to the luminance weight of each frame.

During the sustain period, after the sustain pulse su is alternately applied to the scan electrodes Y and the sustain electrodes Z, the on-cell control pulse Vr having a voltage value smaller than the voltage value of the sustain pulse su is It is applied to the scan electrodes (Y). Accordingly, the last sustain discharge occurs in the discharge cells due to the on-cell control pulse Vr applied to the scan electrodes Y.

In the other conventional PDP driving method, the remaining subfields except the first subfield of one frame are driven by the same method as the driving method of the second subfield.

However, this conventional PDP driving method has a strong discharge in cells in which discharge is generated in a specific subfield by the on-cell control pulse Vr applied to the scan electrodes Y, that is, on-cells. 7 is generated, electrons are charged in the scan electrodes Y of the vertically adjacent off-cells due to crosstalk, so that the off-cell is not switched on in the next subfield. It can not happen. In other words, when a strong discharge is generated in the on-cell, charges move to an adjacent cell due to crosstalk, and electrons with a fast moving speed move much more than holes. At this time, since the on-cell control pulse Vr is applied to the scan electrodes Y of the adjacent off-cells, electrons moved due to the crosstalk are attached to the scan electrodes Y. As a result, the process of the off-cell is switched to the on-cell because the off-cell state is converted but the voltage that can change the off-cell state in the remaining subfields except the first subfield is not applied to the scan electrodes (Y). There is a problem that the cell discharge occurs in the false discharge occurs.

Accordingly, an object of the present invention is to provide a method of driving a plasma display panel which can prevent cell erasing and false discharge due to crosstalk.

In order to achieve the above object, a driving method of a plasma display panel according to the present invention includes a scan electrode, a sustain electrode and an address electrode, and electrodes formed on vertically adjacent discharge cells are formed of a sustain electrode, a scan electrode, a scan electrode, and a sustain electrode. A method of driving a plasma display panel in which one frame is divided into a plurality of subfills and each subfield is divided into a reset period, an address period, and a sustain period, wherein the sustain pulse is generated during the sustain period. Alternately applying to scan electrodes and sustain electrodes; After the sustain pulses are finally applied to the sustain electrodes, the scan electrodes are divided into a radix group and an even group to generate pulses having a predetermined voltage difference so that the radix group and the even group have a predetermined voltage difference. Applying to even groups of scan electrodes.

The applying of the pulse may include applying a positive first pulse to scan electrodes of one of the odd and even groups and a first pulse to the scan electrodes of the group to which the first pulse is not applied. And applying a positive second pulse to alternate with.

The first and second pulses have a voltage value between a minimum value and a maximum value of the sustain pulse.

The first and second pulses may be voltages greater than a voltage at which discharge may not occur in an on-cell and less than a voltage at which discharge may occur in an off-cell.

The first and second pulses may have the same voltage value or different voltage values.

In the method of driving a plasma display panel according to the present invention, when the first pulse is applied to the scan electrodes of any one of the odd group and the even group, the scan electrodes of the group to which the first pulse is not applied are applied. Applying a positive third pulse having a voltage value less than two pulses; and applying the first pulse when the second pulse is applied to the scan electrodes of the group to which the first pulse is not applied. And applying a positive fourth pulse having a voltage value smaller than the first pulse to the scan electrodes of.

The third and fourth pulses may be voltages greater than the base voltage and less than the threshold voltage at which discharge may not occur in the on-cell.

The third and fourth pulses may have the same voltage value or different voltage values.

The second and fourth pulses are applied after a predetermined time later than the first and third pulses.

Each of the first and fourth pulses and the third and second pulses may be stepped.

According to an exemplary embodiment of the present invention, a method of driving a plasma display panel includes a rising ramp waveform rising up to a set-up voltage on the scan electrodes during a reset period of a first subfield of the frame and a sustain voltage having a positive polarity smaller than the peak voltage of the rising ramp waveform. Sequentially applying a first falling ramp waveform falling to the negative polarity and applying a second falling ramp waveform falling from the base voltage to the negative polarity to the scan electrodes during the reset period of the second subfield of the frame; It further comprises a step.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 8 to 10.

8 is a waveform diagram illustrating a method of driving a PDP according to a first embodiment of the present invention.

Referring to FIG. 8, in the driving method of the PDP according to the first embodiment of the present invention, one frame is divided into a plurality of subfields, and each of the subfields selects a reset period and a cell for initializing the full screen. The driving period is divided into an address period for the sustain period and a sustain period for sustaining the discharge of the selected cell.

During the setup period of the reset period of the first subfield in one frame, a rising ramp waveform Ramp-up, which is raised to the setup voltage Vsetup, is simultaneously applied to all the scan electrodes Y. This rising ramp waveform (Ramp-up) causes a weak discharge (setup discharge) to occur in the cells of the full screen to generate wall charges in the cells. The rising ramp waveform Ramp-up is applied only to the first subfield SF1 of one frame. After the rising ramp waveform is applied, the ramp ramp ramps down from the positive sustain voltage (Vs), which is lower than the peak voltage of the ramp ramp, to the negative polarity (-). -down) is simultaneously applied to the scan electrodes Y during the setdown period during the reset period. Ramp-down generates weak erase discharges in the cells, eliminating unnecessary charges during wall charges and space charges generated by setup discharges, and uniformly distributing wall charges required for address discharges in the cells of the full screen. Will remain.

In the address period, a negative scan pulse scan is sequentially applied to the scan electrodes Y, and a positive data pulse data is applied to the address electrodes X. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated during the reset period are added, an address discharge is generated in the cell to which the data pulse is applied. A predetermined wall charge is generated in the cells selected by the address discharge.

On the other hand, the positive sustain voltage Vs is applied to the sustain electrodes Z from the time when the falling ramp waveform Ramp-down is applied to the scan electrodes Y until the end of the address period.

In the sustain period, sustain pulses sus are alternately applied to the scan electrodes Y and the sustain electrodes Z. FIG. Then, the cell selected by the address discharge has a surface discharge between the scan electrodes Y and the sustain electrodes Z whenever the sustain pulse sus is applied while the wall voltage and the sustain pulse sus in the cell are added. In the form of sustain discharge. Here, the number of sustain pulses (sus) applied during the sustain period is set corresponding to the luminance weight of each frame.

During the sustain period, the voltage between the minimum and maximum values of the sustain pulse sus since the last sustain pulse sus was applied to the sustain electrodes Z, i.e., greater than the voltage at which discharge cannot occur in the on-cell. The first and second pulse voltages V1 and V2 of positive polarity (+) having a voltage smaller than the voltage at which discharge is generated in the cell are even-even scan electrodes Y and odd scan electrodes. Is applied to the field Y alternately. Here, the first pulse voltage V1 may have the same voltage value as the second pulse voltage V2 or may have a different voltage value. Accordingly, after the last sustain discharge is generated in the even-numbered discharge cells, the last sustain discharge is sequentially generated in the odd-numbered discharge cells.

Subsequently, a falling ramp waveform Ramp-down, which descends from the base voltage to the negative polarity (−) during the reset period of the second subfield, is simultaneously applied to the scan electrodes Y. Ramp-down generates weak erase discharges in the cells, eliminating unnecessary charges during wall charges and space charges generated by setup discharges, and uniformly distributing wall charges required for address discharges in the cells of the full screen. Will remain.

On the other hand, the off-cells in which sustain discharge is not generated in the first subfield maintain the wall charges formed during the reset period of the first subfield. Therefore, the erase cells do not generate an erase discharge when a falling ramp waveform Ramp-down is supplied to the scan electrodes Y in the second subfield.

Since the address period and the sustain period of the second subfield operate in the same manner as the address period and the sustain period of the first subfield, the detailed operation description will be replaced with the above description.

In fact, the PDP driving method according to the first embodiment of the present invention displays a predetermined image while repeating the above process. In this case, in the PDP driving method according to the first embodiment of the present invention, the remaining subfields except the first subfield of one frame are driven by the same method as the driving method of the second subfield described above.

As described above, in the PDP driving method according to the first embodiment of the present invention, the rising ramp waveform Ramp-down having the setup voltage Vsetup is supplied only during the reset period of the first subfield of one frame so that only the first subfield is supplied. Since light is generated by the setup discharge and no light is generated by the setup discharge in the remaining subfields, not only the contrast can be improved but also the power consumption can be reduced. In addition, in the driving method of the PDP according to the first embodiment of the present invention, the minimum value of the sustain pulse su at the even scan electrodes Y and the odd scan electrodes Y during the sustain period. Positive and positive pulse voltages V1 having a voltage value between the maximum and the maximum value, that is, a voltage larger than a voltage at which discharge may not occur in an on-cell and smaller than a voltage at which discharge is generated in an off-cell. By alternately applying V2), crosstalk between vertically adjacent cells can be prevented. As a result, since cell erasure is prevented in vertically adjacent cells, mis-discharge can be prevented. In other words, when one of the first and second pulse voltages V1 and V2 is applied to the scan electrodes Y of the on cells and strong discharge occurs in the on cells, electrons are accumulated on the scan electrodes Y of the on cells. do. In this case, since the ground voltage GND is applied to the scan electrodes Y of the vertically adjacent off-cells, electrons accumulated on the scan electrodes Y of the on-cells do not move to the vertically adjacent off-cells. In addition, even when electrons accumulated in the scan electrodes Y of the on-cells move to vertically adjacent off-cells, the ground voltage GND is applied to the scan electrodes Y of the off-cell, so that the electrons moved to the off-cells disappear. Done. Accordingly, even when the first and second pulse voltages V1 and V2 are applied to the scan electrodes Y of the on cells, the wall charge states of the off cells are not changed. As a result, since no cell leakage or false discharge occurs, the PDP can be driven stably.

In the driving method of the PDP according to the first embodiment of the present invention, the first pulse voltage V1 is applied to the even scan electrodes Y, and then to the odd scan electrodes Y. Although only a method of applying the second pulse voltage V2 has been described, the first pulse voltage V1 is applied to the odd scan electrodes Y and then the even scan electrodes Y are applied. The same effect can be obtained even if the second pulse voltage V2 is applied. In other words, in the driving method of the PDP according to the first embodiment of the present invention, the pulse voltage is first applied to the even scan electrodes Y, but the pulse voltage is applied to the odd scan electrodes Y. Even if it is applied first, the same effect as the driving method of the PDP according to the first embodiment of the present invention can be obtained.

9 is a waveform diagram illustrating a method of driving a PDP according to a second embodiment of the present invention.

Referring to FIG. 9, in the driving method of the PDP according to the second embodiment of the present invention, one frame is divided into a plurality of subfields, and each of the subfields selects a reset period and a cell for initializing the full screen. The driving period is divided into an address period for the sustain period and a sustain period for sustaining the discharge of the selected cell.

The driving method of the PDP according to the second embodiment of the present invention is the same as the driving method of the remaining periods except for the sustain period as compared with the first embodiment of the present invention. .

In the sustain period, sustain pulses sus are alternately applied to the scan electrodes Y and the sustain electrodes Z. FIG. Then, the cell selected by the address discharge has a surface discharge between the scan electrodes Y and the sustain electrodes Z whenever the sustain pulse sus is applied while the wall voltage and the sustain pulse sus in the cell are added. In the form of sustain discharge. Here, the number of sustain pulses (sus) applied during the sustain period is set corresponding to the luminance weight of each frame.

During the sustain period, the voltage between the minimum and maximum values of the sustain pulse sus since the last sustain pulse sus was applied to the sustain electrodes Z, i.e., greater than the voltage at which discharge cannot occur in the on-cell. The first and second pulse voltages V1 and V2 of positive polarity (+) having a voltage smaller than the voltage at which discharge is generated in the cell are even-even scan electrodes Y and odd scan electrodes. Is applied to the field Y alternately. Here, the first pulse voltage V1 may have the same voltage value as the second pulse voltage V2 or may have a different voltage value. In addition, when the first pulse voltage V1 is applied to the even scan electrodes Y, the odd scan electrodes Y may be larger than the base voltage and discharge may not occur in the on cells. The third positive pulse voltage V3 having a voltage smaller than the boundary voltage (that is, the minimum value of the sustain pulse) is applied. In addition, when the second pulse voltage V2 is applied to the odd scan electrodes Y, the even scan electrodes Y may be larger than the base voltage and may not generate discharge in the on cells. The fourth positive pulse voltage V4 having a positive polarity (+) having a voltage smaller than the boundary voltage (that is, the first pulse voltage) is applied. Here, the third pulse voltage V3 may have the same voltage value as the fourth pulse voltage V4 or different voltage values. At this time, the even scan electrodes Y and the even scan electrodes Y are provided to the even scan electrodes Y and the odd scan electrodes Y. The second and fourth pulse voltages V2 and V4 are applied after a predetermined time T1 later than the first and third pulse voltages V1 and V3 respectively applied. Accordingly, after the last sustain discharge occurs in even-numbered discharge cells, the last sustain discharge occurs sequentially in the odd-numbered discharge cells.

As described above, in the PDP driving method according to the second exemplary embodiment of the present invention, the rising ramp waveform Ramp-down having the setup voltage Vsetup is supplied only during the reset period of the first subfield of one frame so that only the first subfield is supplied. Since light is generated by the setup discharge and no light is generated by the setup discharge in the remaining subfields, not only the contrast can be improved but also the power consumption can be reduced. Also, in the driving method of the PDP according to the second embodiment of the present invention, the positive polarity (+) is applied to the even scan electrodes (Y) and the odd scan electrodes (Y) during the sustain period. The first and second pulse voltages V1 and V2 are alternately applied, and the first and second pulse voltages are applied to the even-numbered scan electrodes Y and the odd-numbered scan electrodes Y. When V1 and V2 are applied, the third and fourth pulse voltages V3 and V4 are applied to the odd scan electrodes Y and the even scan electrodes Y, respectively. Therefore, crosstalk between adjacent cells can be prevented. In other words, when strong discharge is generated in the on cells by either one of the first and second pulse voltages V1 and V2, the scan electrodes Y of the vertically adjacent off-cells may be applied to the first and second pulse voltages. Since any one of the third and fourth pulse voltages V3 and V4 having a voltage value smaller than that of any one of V1 and V2 is applied, electrons accumulated in the scan electrodes Y when strong discharge occurs in the on cells. They do not move to the scan electrodes Y of the vertically adjacent off cells. Accordingly, since cell erasing in the vertically adjacent cells is prevented, erroneous discharge can be prevented.

In the driving method of the PDP according to the second embodiment of the present invention, the first and fourth pulse voltages V1 and V4 are applied to the even-numbered scan electrodes Y, and the odd-numbered scan electrodes are applied. Only the method of applying the third and second pulse voltages V3 and V2 to the field Y is described, but the first and fourth pulse voltages V1 and V4 are applied to the odd scan electrodes Y. The same effect can be obtained even when the third and second pulse voltages V3 and V2 are applied to the even scan electrodes Y. In other words, in the driving method of the PDP according to the second embodiment of the present invention, the pulse voltage is first applied to the even scan electrodes Y, but the pulse voltage is applied to the odd scan electrodes Y. Even if it is applied first, the same effect as the driving method of the PDP according to the second embodiment of the present invention can be obtained.

10 is a waveform diagram illustrating a method of driving a PDP according to a third embodiment of the present invention.

Referring to FIG. 10, in the driving method of the PDP according to the third embodiment of the present invention, one frame is divided into a plurality of subfields, and each of the subfields selects a reset period and a cell for initializing the full screen. The driving period is divided into an address period for the sustain period and a sustain period for sustaining the discharge of the selected cell.

The driving method of the PDP according to the third embodiment of the present invention is the same as the driving method of the remaining periods except for the sustain period as compared with the first embodiment of the present invention, so the detailed description of the remaining periods will be replaced with the above description. .

In the sustain period, sustain pulses sus are alternately applied to the scan electrodes Y and the sustain electrodes Z. FIG. Then, the cell selected by the address discharge has a surface discharge between the scan electrodes Y and the sustain electrodes Z each time the sustain pulse sus is applied while the wall voltage and the sustain pulse sus in the cell are added. In the form of sustain discharge. Here, the number of sustain pulses (sus) applied during the sustain period is set corresponding to the luminance weight of each frame.

During the sustain period, the voltage between the minimum and maximum values of the sustain pulse sus since the last sustain pulse sus was applied to the sustain electrodes Z, i.e., greater than the voltage at which discharge cannot occur in the on-cell. The first and second pulse voltages V1 and V2 of positive polarity (+) having a voltage smaller than the voltage at which discharge is generated in the cell are even-even scan electrodes Y and odd scan electrodes. Is applied to the field Y alternately. Here, the first pulse voltage V1 may have the same voltage value as the second pulse voltage V2 or may have a different voltage value. In addition, when the first pulse voltage V1 is applied to the even scan electrodes Y, the odd scan electrodes Y may be larger than the base voltage and discharge may not occur in the on cells. The third pulse voltage V3 of positive polarity (+) smaller than the threshold voltage present (that is, the minimum value of the sustain pulse) is applied. In addition, when the second pulse voltage V2 is applied to the odd scan electrodes Y, the even scan electrodes Y may be larger than the base voltage and may not generate discharge in the on cells. The fourth pulse voltage V4 of positive polarity (+) smaller than the boundary voltage (that is, the first voltage) is applied. Here, the third pulse voltage V3 may have the same voltage value as the fourth pulse voltage V4 or different voltage values. In this case, the third and second pulse voltages V3 and V2 are sequentially applied to the odd scan electrodes Y, and the first is sequentially applied to the even scan electrodes Y. FIG. And the fourth pulse voltages V1 and V4 are stepped pulse waveforms. Accordingly, after the last sustain discharge occurs in the even-numbered discharge cells, the last sustain discharge occurs sequentially in the odd-numbered discharge cells.

As described above, in the driving method of the PDP according to the third embodiment of the present invention, the rising ramp waveform Ramp-down having the setup voltage Vsetup is supplied only during the reset period of the first subfield of one frame so that only the first subfield is supplied. Since light is generated by the setup discharge and no light is generated by the setup discharge in the remaining subfields, not only the contrast can be improved but also the power consumption can be reduced. In addition, in the driving method of the PDP according to the third embodiment of the present invention, positive polarity (+) is applied to the even scan electrodes (Y) and the odd scan electrodes (Y) during the sustain period. The first and second pulse voltages V1 and V2 are alternately applied, and the first and second pulse voltages are applied to the even-numbered scan electrodes Y and the odd-numbered scan electrodes Y. When V1 and V2 are applied, the third and fourth pulse voltages V3 and V4 are applied to the odd scan electrodes Y and the even scan electrodes Y, respectively. Therefore, crosstalk between adjacent cells can be prevented. In other words, when strong discharge is generated in the on cells by either one of the first and second pulse voltages V1 and V2, the scan electrodes Y of the vertically adjacent off-cells may be applied to the first and second pulse voltages. Since any one of the third and fourth pulse voltages V3 and V4 having a voltage value smaller than that of any one of V1 and V2 is applied, electrons accumulated in the scan electrodes Y when strong discharge occurs in the on cells. They do not move to the scan electrodes Y of the vertically adjacent off cells. Accordingly, since cell erasing in the vertically adjacent cells is prevented, erroneous discharge can be prevented.

In the driving method of the PDP according to the third embodiment of the present invention, the first and fourth pulse voltages V1 and V4 are applied to the even-numbered scan electrodes Y, and the odd-numbered scan electrodes are applied. Only the method of applying the third and second pulse voltages V3 and V2 to the field Y is described, but the first and fourth pulse voltages V1 and V4 are applied to the odd scan electrodes Y. The same effect can be obtained even when the third and second pulse voltages V3 and V2 are applied to the even scan electrodes Y. In other words, in the driving method of the PDP according to the third embodiment of the present invention, the pulse voltage is first applied to the even scan electrodes Y, but the pulse voltage is applied to the odd scan electrodes Y. Even if it is applied first, the same effect as the driving method of the PDP according to the third embodiment of the present invention can be obtained.

As described above, in the method of driving the plasma display panel according to the present invention, the scan electrodes are divided into radix and even numbers to apply different levels of voltages to the odd-numbered scan electrodes and even-numbered scan electrodes. By generating the crosstalk between vertically adjacent cells can be prevented. Accordingly, since cell erasing in the vertically adjacent cells is prevented, erroneous discharge can be prevented.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (11)

The electrodes formed on the vertically adjacent discharge cells having the scan electrode, the sustain electrode and the address electrode are arranged in the order of sustain electrode-scan electrode-scan electrode-sustain electrode, and one frame is divided into a plurality of subfills, and a subfield In the driving method of the plasma display panel, each of which is driven by being divided into a reset period, an address period, and a sustain period, Alternately applying a sustain pulse to the scan electrodes and the sustain electrodes during the sustain period; After the sustain pulses are finally applied to the sustain electrodes, the scan electrodes are divided into a radix group and an even group to generate pulses having a predetermined voltage difference so that the radix group and the even group have a predetermined voltage difference. And applying the scan electrodes of the even group. The method of claim 1, Applying the pulse, Applying a positive first pulse to scan electrodes of any one of the odd and even groups; And applying a positive second pulse to the scan electrodes of the group to which the first pulse is not applied so as to alternate with the first pulse. The method of claim 2, And the first and second pulses have a voltage value between a minimum value and a maximum value of the sustain pulse. The method of claim 3, wherein And the first and second pulses are voltages greater than a voltage at which discharge cannot occur in an on-cell and less than a voltage at which discharge is generated in an off-cell. The method of claim 4, wherein And the first and second pulses have the same voltage value or different voltage values. The method of claim 2, A positive polarity having a voltage value smaller than that of the second pulse to the scan electrodes of the group where the first pulse is not applied when the first pulse is applied to the scan electrodes of any of the odd group and the even group Applying three pulses, Positive fourth pulse having a lower voltage value than that of the first pulse on scan electrodes of the group to which the first pulse is applied when the second pulse is applied to the scan electrodes of the group to which the first pulse is not applied The method of driving a plasma display panel further comprising the step of applying. The method of claim 6, And the third and fourth pulses are voltages greater than a base voltage and less than a threshold voltage at which discharge may not occur in an on-cell. The method of claim 7, wherein And the third and fourth pulses have the same voltage value or different voltage values. The method of claim 6, And the second and fourth pulses are applied a predetermined time later than the first and third pulses. The method of claim 6, And the first and fourth pulses and the third and second pulses each have a stepped shape. The method of claim 1, The rising ramp waveform rising to the set-up voltage and the first falling ramp waveform falling negative from the positive sustain voltage smaller than the peak voltage of the rising ramp waveform during the reset period of the first subfield of the frame. Applying sequentially; And applying a second falling ramp waveform of negative polarity at a base voltage to the scan electrodes during the reset period of the second subfield of the frame.

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