KR100577765B1 - Driving Method of Plasma Display Panel - Google Patents

Abstract

The present invention relates to a plasma display panel driving method.

The present invention relates to a method of driving a plasma display panel in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period. The red (R), green (G), and blue (B) phosphors may be driven by varying a predetermined bias voltage supply period to the data electrodes arranged thereon.

Description

Driving Method of Plasma Display Panel {Driving Method of Plasma Display Panel}

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

2 is a diagram showing a method of expressing image gradation of a conventional PDP.

3 is a diagram illustrating a driving waveform of a PDP according to a conventional PDP driving method.

4 illustrates another driving waveform of the conventional PDP.

5 is a view illustrating a driving waveform in accordance with a plasma display panel driving method according to a first embodiment of the present invention;

Figure 6 is a view showing a state of charge of the wall according to the conventional drive waveform and the drive waveform of the present invention.

7 is a view showing a driving waveform according to the plasma display panel driving method according to the second embodiment of the present invention.

8 is a view illustrating a driving waveform in accordance with a plasma display panel driving method according to a third embodiment of the present invention;

9 is a view illustrating a driving waveform in accordance with a plasma display panel driving method according to a fourth embodiment of the present invention;

10 is a view showing a driving waveform in accordance with a plasma display panel driving method according to a fifth embodiment of the present invention;

11 is a view showing a driving waveform in accordance with a plasma display panel driving method according to a sixth embodiment of the present invention;

12 is a view showing a driving waveform in accordance with a plasma display panel driving method according to a seventh embodiment of the present invention;

13 is a view illustrating a driving waveform in accordance with a plasma display panel driving method according to an eighth embodiment of the present invention;

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

10: upper substrate 11: scanning / sustaining electrode

12: common sustain electrode 13a, 13b: dielectric layer

14: protective film 20: lower substrate

21: partition 22: address electrode

23: phosphor layer

The present invention relates to a method for driving a plasma display panel, and more particularly, to a method for driving a plasma display panel that can adjust driving amount of wall charge according to each phosphor discharge cell to secure driving margin and at the same time improve gray scale expression.

In general, a plasma display panel (hereinafter referred to as "PDP") displays an image including a character or a graphic by emitting phosphors by 147 nm ultraviolet rays generated when a He + Xe or Ne + Xe inert mixed gas is discharged. Done.

1 is a perspective view showing the structure of a conventional three-electrode AC surface discharge type PDP. Referring to FIG. 1, the three-electrode AC surface discharge type PDP includes a scan / sustain electrode 11 and a common sustain electrode 12 formed on the upper substrate 10, and an address electrode formed on the lower substrate 20. 22). Each of the scan / sustain electrode 11 and the common sustain electrode 12 is formed of a transparent electrode, for example, indium-tin oxide (ITO, 11a, 12a). Each of the scan / sustain electrode 11 and the common sustain electrode 12 is formed with metal bus electrodes 11b and 12b for reducing resistance. An upper dielectric layer 13a and a passivation layer 14 are stacked on the upper substrate 10 having the scan / sustain electrode 11 and the common sustain electrode 12 formed thereon. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 13a. The protective layer 14 prevents damage to the upper dielectric layer 13a due to sputtering generated during plasma discharge, and increases emission efficiency of secondary electrons. As the protective film 14, magnesium oxide (MgO) is usually used.

Meanwhile, the lower dielectric layer 13b and the partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed, and the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 13b and the partition wall 21. Is applied. The address electrode 22 is formed in the direction crossing the scan / sustain electrode 11 and the common sustain electrode 12. The partition wall 21 is formed in parallel with the address electrode 22 to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 23 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. An inert mixed gas such as He + Xe or Ne + Xe for discharging is injected into the discharge space of the discharge cells provided between the upper and lower substrates 10 and 20 and the partition wall 21. A method of expressing image gradation of a conventional PDP having such a structure will be described with reference to FIG. 2.

2 shows a method of expressing image gradation of a conventional PDP. As shown, the image gradation of the PDP is driven by dividing one frame into several subfields having different number of emission times. Each subfield is divided into a reset period for uniformly generating a discharge, an address period for selecting a discharge cell, and a sustain period for implementing gray levels according to the number of discharges. For example, when the image is to be displayed with 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields. In addition, each of the eight subfields is divided into an address period and a sustain period. Here, the reset period and the address period of each subfield are the same for each subfield, while the sustain period increases at a rate of 2n (n = 0,1,2,3,4,5,6,7) in each subfield. do. Looking at the driving waveform of the PDP according to the PDP driving method as shown in FIG.

3 illustrates a driving waveform of a PDP according to a conventional PDP driving method. As shown, the PDP is divided into an initialization period for initializing all screens, an address period for selecting cells, and a sustain period for maintaining discharge of the selected cells.

In the initialization period, the rising ramp waveform Ramp-up is simultaneously applied to all the scan electrodes Y in the setup period SU. This rising ramp waveform causes discharge to occur in the cells of the full screen. By this setup discharge, positive wall charges are accumulated on the data electrode X and the sustain electrode Z, and negative wall charges are accumulated on the scan electrode Y. During the set-down period SD, after the rising ramp waveform is supplied, the ramp ramp starts to fall from the positive voltage lower than the peak voltage of the rising ramp waveform and falls to the base voltage GND or a specific voltage level of the negative ramp. -down) causes a slight erase discharge in the cells, which partially erases the overcharged wall charge. By this set down discharge, the wall charges such that the address discharge can stably occur remain uniformly in the cells.

In the address period, the negative scan pulse Scan is sequentially applied to the scan electrodes Y, and the positive data pulse data is applied to the data electrodes X in synchronization with the scan pulse. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated during the initialization period are added, an address discharge is generated in the cell to which the data pulse is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when a sustain voltage is applied. The sustain electrode Z is supplied with a positive polarity DC voltage Zdc during the set down period and the address period so as to reduce the voltage difference with the scan electrode Y so that an erroneous discharge with the scan electrode Y does not occur.

In the sustain period, a sustain pulse Su is applied to the scan electrodes Y and the sustain electrodes Z alternately. 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 Y and the sustain electrode Z every time the sustain pulse is applied.

After the sustain discharge is completed, a ramp waveform (Ramp-ers) having a small pulse width and a low voltage level is supplied to the sustain electrode Z to erase the wall charge remaining in the cells of the full screen.

During the sustain period, the voltage of the ground potential is supplied to the data electrode from the data driver to maintain the ground potential state.

On the other hand, since high voltage pulses of about 200V are alternately applied between the scan electrode Y and the sustain electrode Z, the data electrodes X formed at intervals of about 100 μm in height of the partition wall 24 are alternately applied. Predetermined wall charges are accumulated. At this time, the wall voltage, which is half of the sustain voltage, is accumulated on the data electrode X in the cell. This is because the scan electrodes Y and the sustain electrodes Z are alternately applied with the voltages of the sustain voltage and the ground potential. As a result, the reason why the wall voltage is formed on the data electrode X during the sustain period is because a ground potential is applied to the data electrode X itself. As such, when wall charges are formed on the data electrode X, there is a problem that the sustain discharge does not sufficiently occur and the discharge efficiency is lowered.

In order to solve this problem, the following four driving methods have been proposed.

4 illustrates another driving waveform of the conventional PDP. Referring to FIG. 4, it can be seen that another driving waveform of the conventional PDP is to float the data electrode during the sustain period. As described above, if the data electrode X is floated so that the wall voltage is not accumulated, the sustain discharge is generated more efficiently than the ground potential is maintained at the data electrode X during the sustain period.

However, during the address discharge between the scan electrode Y and the data electrode X, it is preferable that a predetermined wall charge is accumulated on the data electrode X so that a stable address discharge occurs. Therefore, a driving condition that can cause stable discharge in the address period or the sustain period is required.

Meanwhile, in addition to display devices such as CRT, LCD, and FED, PDP also requires white balance, that is, color temperature correction. This color temperature correction is a leveling signal in the process of processing the video signal according to the brightness ratio of the R, G, B color, regardless of the fact that the discharge voltage characteristics of each of the R, G, B phosphors are different as already known (leveling) to implement. In other words, the color temperature is corrected by processing the video signal according to the brightness ratio of R, G, and B colors such as Y = 0.3R + 0.59G + 0.11B without adjusting the phosphor discharge voltage characteristics of R, G, and B. Done. However, there is a problem in that the gray scale expression power is lowered when the video signal is leveled according to the characteristics of the R, G, and B phosphors.

In order to solve the above problems, the present invention is different from the driving method of the initialization period and the sustain period, the plasma display panel can correct the color temperature without degrading the gray scale expression power, and at the same time improve the driving margin by adjusting the wall charge amount The purpose is to provide a driving method.

The technical solution of the first embodiment according to the present invention for achieving the above object is a plasma display panel driving method in which a plurality of subfields having different number of emission times are divided into an initialization period, an address period, and a sustain period to implement an image. The red (R), green (G), and blue (B) phosphors may be driven by varying a predetermined bias voltage supply period to each of the data electrodes in which the phosphors are disposed during the setup period.

The technical solution according to the second embodiment of the present invention is a plasma display panel driving method in which a plurality of subfields having different number of emission times are divided into an initialization period, an address period, and a sustain period to implement an image. The red (R), green (G), and blue (B) phosphors are driven by varying a predetermined bias voltage supply period to the data electrodes.

The technical solution according to the third embodiment of the present invention is a plasma display panel driving method in which a plurality of subfields having different number of emission times are divided into an initialization period, an address period, and a sustain period to implement an image. Among the data electrodes in which the red (R), green (G), and blue (B) phosphors are arranged, the predetermined bias voltage supply periods supplied to the data electrodes in which the two phosphors are arranged are the same, and the other one is disposed The predetermined bias voltage supply period supplied to the data electrodes is driven differently.

According to a fourth aspect of the present invention, there is provided a plasma display panel driving method in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. Among the data electrodes in which the red (R), green (G), and blue (B) phosphors are arranged, the predetermined bias voltage supply periods supplied to the data electrodes in which the two phosphors are arranged are the same, and the other one is disposed The predetermined bias voltage supply period supplied to the data electrodes is driven differently.

The technical solution according to the fifth embodiment of the present invention is a plasma display panel driving method in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. ) And green (G) and blue (B) phosphors, respectively, are driven by varying a predetermined bias voltage supply period.

The technical solution according to the sixth embodiment of the present invention is a plasma display panel driving method in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. ), A predetermined bias voltage supply period for supplying the data electrodes in which two phosphors are disposed among the data electrodes in which the green (G) and blue (B) phosphors are disposed is the same, and the data electrode in which the other phosphor is disposed It is characterized in that between the predetermined bias voltage supply supplied to the different drive.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

<First Embodiment>

5 is a view showing a driving waveform in accordance with the plasma display panel driving method according to the first embodiment of the present invention. Referring to FIG. 5, in the method of driving a plasma display panel according to the first embodiment of the present invention, a plurality of subfields having different emission counts are driven by being divided into a reset period, an address period, and a sustain period. In the initialization period, the rising ramp waveform (Ramp-up) is simultaneously supplied to all the scan electrodes (Y) in the setup (SU) period, and the falling ramp waveform (Ramp-down) in the set-down (SD) period as in the prior art. This supply causes a slight erase discharge in the cells, thereby partially erasing the excessively formed wall charge. At this time, the data electrodes X (R), X (G), and X (B) in which R, G, and B phosphors are disposed in synchronization with the setup period during which the rising ramp waveform Ramp-up is supplied. A predetermined bias voltage Va having a different period is supplied to each phosphor. The predetermined bias voltage supply period is adjusted by a timing controller (not shown).

The predetermined bias voltage Va supplied to the data electrode X includes any voltage ranging from the ground voltage 0V to the positive voltage. However, in consideration of the voltage source of the data electrode for supplying the data pulse during address discharge, in the case of the positive voltage, it is preferable to have the same voltage as the voltage for supplying the data pulse.

As such, the wall charge state of the data electrode X according to the present invention, in which the predetermined bias voltage Va is supplied to the data electrode X in the setup SU period, and the data electrode is grounded in the conventional setup SU period. Looking at the wall charge state of the data electrode when maintaining the state as shown in FIG.

6 is a view showing the state of the wall charge according to the conventional drive waveform and the drive waveform of the present invention. As shown, (a) shows the wall charge distribution when the conventional data electrode X maintains the ground (0V) state, and (b) shows a predetermined value for the data electrode X of the plasma display panel according to the present invention. It is the wall charge distribution shown when supplying the bias voltage Va of. Looking at the wall charge distribution according to (a) and (b), the wall charge amount of the data electrode of the present invention, which is supplied with a predetermined bias voltage during the setup period, is smaller than the wall charge amount when the data electrode maintains the ground state. It can be seen.

The reason why the wall charge amount varies depending on the bias voltage Va supplied to the data electrode X is that the data electrode X is also discharged during surface discharge between the scan electrode Y and the sustain electrode Z by the setup pulse. This is because the influence of the discharge is different depending on the potential of the data electrode X due to being affected. In other words, when the predetermined bias voltage Va is supplied to the data electrode X, the negative charge distribution increases more than when the ground state is maintained, resulting in a different amount of wall charge.

The change of the wall charge amount of the data electrode X, that is, the change of the wall charge amount according to the predetermined bias voltage Va supplied to the data electrode X during the setup period, affects the address discharge generated thereafter. Get mad.

Therefore, as in the first embodiment, a predetermined bias voltage having a different period is applied to the data electrodes X (R), X (G), and X (B) in which the R, G, and B phosphors are disposed in the setup (SU) period. If each of the data electrodes X (R), X (G), and X (B) is supplied differently, the amount of wall charges can be adjusted for each of the R, G, and B discharge cells during address discharge, thereby securing a driving margin. You can do it.

In this case, the predetermined bias voltage Va supplied to the data electrodes X (R), X (G), and X (B) on which the R, G, and B phosphors are disposed is a unit subfield for driving the plasma display panel. Although it can be supplied for every set up period of SU, a set up period of combining one or more subfields, for example, a set up period of combining two or three subfields into one unit subfield. It may be supplied every time.

Second Embodiment

7 is a view showing a driving waveform in accordance with the plasma display panel driving method according to the second embodiment of the present invention. Referring to FIG. 7, in the plasma display panel driving method according to the second embodiment of the present invention, a plurality of subfields having different number of emission times are driven by being divided into an initialization period, an address period, and a sustain period as in the first embodiment. In the period, the rising ramp waveform (Ramp-up) is simultaneously supplied to all the scan electrodes (Y) in the setup (SU) period, and the falling ramp waveform (Ramp-down) is supplied in the set-down (SD) period as in the prior art. By causing a slight erase discharge in the cells, some overcharged wall charges are erased. At this time, in the set down (SD) period in which the falling ramp waveform is supplied, the periods in accordance with each phosphor in the data electrodes (X (R), X (G), and X (B)) in which the R, G, and B phosphors are disposed, respectively. This other predetermined bias voltage Va is supplied. The predetermined bias voltage Va supply period is adjusted by a timing controller (not shown).

At this time, the predetermined bias voltage Va supplied to the data electrode X includes an arbitrary voltage ranging from the ground voltage 0V to the positive polarity voltage, except that data for supplying a data pulse during address discharge is provided. Considering the voltage source of the electrode, when the bias voltage is the positive voltage, it is preferable to have the same voltage as the voltage for supplying the data pulse.

As described above, when the predetermined bias voltage Va is supplied to the data electrode X during the set down SD period, the address discharge generated thereafter is affected as in the first embodiment.

Therefore, as in the second embodiment, a predetermined bias voltage having a different period from the data electrodes X (R), X (G), and X (B) in which the R, G, and B phosphors are arranged in the set-down (SD) period. If the waveform is supplied to each of the data electrodes X (R), X (G), and X (B) differently, then the amount of wall charges can be adjusted for each of the R, G, and B discharge cells during address discharge, thereby driving margin. Can be secured.

In this case, the predetermined bias voltage Va supplied to the data electrodes X (R), X (G), and X (B) on which the R, G, and B phosphors are disposed is a unit subfield for driving the plasma display panel. It can be supplied for each set down (SD) period of, but a set down (SD) period in which one or more subfields are combined, for example, a set down in which two or three subfields are combined into one unit subfield ( It may also be supplied per SD) period.

As in the first and second embodiments, the plasma display panel driving method according to the present invention separates the set-up period from the set-up period during the initialization period, and applies predetermined bias voltages having different periods of R, G, Driving margin can be secured by supplying the B phosphors to the data electrodes X (R), X (G), and X (B), respectively, but R, G, The driving margin can be secured by supplying predetermined bias voltages having different supply periods to the data electrodes X (R), X (G), and X (B) on which the B phosphors are disposed.

Third Embodiment

8 is a view showing a driving waveform according to the plasma display panel driving method according to the third embodiment of the present invention. Referring to Figure 8 has the same drive waveforms as the first and second embodiments according to the present invention. However, predetermined bias voltages having different supply periods for the data electrodes X (R), X (G), and X (B) in which the R, G, and B phosphors are disposed respectively in the setup period and the set-down period of one subfield. Is supplied.

Fourth Embodiment

9 is a view showing a driving waveform according to the plasma display panel driving method according to the fourth embodiment of the present invention. Referring to FIG. 9, in the method of driving a plasma display panel according to the fourth embodiment of the present invention, a plurality of subfields having different emission counts are driven by being divided into a reset period, an address period, and a sustain period. In the initialization period, the rising ramp waveform (Ramp-up) is simultaneously supplied to all the scan electrodes (Y) in the setup (SU) period, and the falling ramp waveform (Ramp-down) in the set-down (SD) period as in the prior art. This supply causes a slight erase discharge in the cells, thereby partially erasing the excessively formed wall charge. At this time, the data electrodes X (R), X (G), and X (B) in which R, G, and B phosphors are disposed in synchronization with the setup period during which the rising ramp waveform Ramp-up is supplied. Among the two phosphors, the predetermined bias voltage Va is supplied to each of the data electrodes provided with the same supply period, and the predetermined bias voltage Va having different periods is supplied to the data electrode provided with the other phosphor. The predetermined bias voltage supply period is adjusted by a timing controller (not shown).

The predetermined bias voltage Va supplied to the data electrode X includes any voltage ranging from the ground voltage 0V to the positive voltage. However, in consideration of the voltage source of the data electrode for supplying the data pulse during address discharge, in the case of the positive voltage, it is preferable to have the same voltage as the voltage for supplying the data pulse.

As described above, two phosphors among the data electrodes X (R), X (G), and X (B) in which the red (R), green (G), and blue (B) phosphors are disposed during the setup (SU) period are respectively formed. The data electrode on which the red and blue phosphors are disposed is supplied with a predetermined bias voltage for the same period, and the data electrode on which the remaining phosphors are disposed, for example, green (G). When the above-mentioned red (R) and blue (B) phosphors are supplied to the data electrode on which the phosphors are arranged, the address electrode is then discharged from among the red (R), green (G), and blue (B) phosphors during address discharge. Since the wall charge amount can be adjusted based on any one of the phosphor discharge cells, driving margin can be more easily secured.

In this case, the predetermined bias voltage Va supplied to the data electrodes X (R), X (G), and X (B) on which the R, G, and B phosphors are disposed is a unit subfield for driving the plasma display panel. Although it can be supplied for every set up period of SU, a set up period of combining one or more subfields, for example, a set up period of combining two or three subfields into one unit subfield. It may be supplied every time.

Fifth Embodiment

10 is a view showing a driving waveform in accordance with the plasma display panel driving method according to the fifth embodiment of the present invention. Referring to FIG. 10, in the plasma display panel driving method according to the fifth embodiment of the present invention, like the fourth embodiment, a plurality of subfields having different emission counts are driven by being divided into an initialization period, an address period, and a sustain period. In the period, the rising ramp waveform (Ramp-up) is simultaneously supplied to all the scan electrodes (Y) in the setup (SU) period, and the falling ramp waveform (Ramp-down) is supplied in the set-down (SD) period as in the prior art. By causing a slight erase discharge in the cells, some overcharged wall charges are erased. At this time, two phosphors among the data electrodes X (R), X (G), and X (B) each of which R, G, and B phosphors are disposed in the set down (SD) period in which the falling ramp waveform is supplied, respectively. The predetermined bias voltage Va supplied to the arranged data electrodes is the same, and the predetermined bias voltage Va having a different duration is supplied to the data electrode on which the other phosphor is disposed. The predetermined bias voltage supply period is adjusted by a timing controller (not shown).

The predetermined bias voltage Va supplied to the data electrode X includes any voltage ranging from the ground voltage 0V to the positive polarity voltage, except that the voltage source of the data electrode for supplying the data pulse at the time of address discharge. In consideration of this, when the bias voltage is the positive voltage, it is preferable to have the same voltage as the voltage for supplying the data pulse.

As described above, two phosphors among the data electrodes X (R), X (G), and X (B) in which red (R), green (G), and blue (B) phosphors are disposed in the set down (SD) period are Data electrodes on which red and blue phosphors are disposed, for example, are supplied with predetermined bias voltages and data electrodes on which the remaining phosphors are disposed, for example, green (G). When the red (R) and blue (B) phosphors are supplied to the data electrodes on which the phosphors are arranged, red (R) and green ( Since the amount of wall charges can be adjusted based on any one of the phosphor discharge cells of G) and blue (B) phosphors, driving margins can be more easily secured.

In this case, the predetermined bias voltage Va supplied to the data electrodes X (R), X (G), and X (B) on which the R, G, and B phosphors are disposed is a unit subfield for driving the plasma display panel. It can be supplied for each set down (SD) period of, but a set down (SD) period in which one or more subfields are combined, for example, a set down in which two or three subfields are combined into one unit subfield ( It may also be supplied per SD) period.

On the other hand, as in the fourth and fifth embodiments, the plasma display panel driving method of the present invention separates the setup period and the set-down period during the initialization period, and each of the data electrodes in which the R, G, and B phosphors are disposed in each period is provided. Data of a predetermined bias voltage Va supplied to the data electrode on which two phosphors of (X (R), X (G), and X (B)) are respectively disposed is the same, and the other one of the phosphors is arranged Although a driving margin can be secured by supplying a predetermined bias voltage Va having a different period to the electrode, as shown in FIG. 11, the data electrodes X (where R, G, and B phosphors are disposed in the setup period and the setdown period, respectively) The period of supply of the predetermined bias voltage Va supplied to the data electrode on which two phosphors of R), X (G) and X (B)) are respectively provided is the same, and the period on the data electrode on which the other phosphor is disposed This other predetermined bias voltage Va is supplied Driving margin can be secured.

Sixth Embodiment

FIG. 11 illustrates driving waveforms according to a plasma display panel driving method according to a sixth embodiment of the present invention. Referring to Figure 11 has the same drive waveforms as the fifth and sixth embodiments of the present invention. However, two phosphors among the data electrodes X (R), X (G), and X (B) having R, G, and B phosphors respectively disposed in the setup period and the setdown period are respectively supplied to the data electrodes that are disposed. The predetermined bias voltage Va is supplied with the same bias voltage and a predetermined bias voltage Va having a different period is supplied to the data electrode on which the other phosphor is disposed.

Seventh Embodiment

12 is a view showing a driving waveform according to the plasma display panel driving method according to the seventh embodiment of the present invention. Referring to FIG. 12, in the plasma display panel driving method according to the seventh exemplary embodiment of the present invention, a plurality of subfields having different emission counts are driven by being divided into an initialization period, an address period, and a sustain period.

In the initialization period, a rising ramp waveform (Ramp-up) is simultaneously supplied to all scan electrodes (Y) in the setup (SU) period, and a falling ramp waveform (Ramp-down) is supplied in the cells during the set-down (SD) period. The weak erase discharge causes some of the excessively formed wall charges to be erased.

Thereafter, in the address period, scan pulses are sequentially supplied to the scan electrodes Y, and at the same time, data pulses are supplied to the data electrodes X in synchronization with the scan pulses to generate addressing discharges.

Subsequently, in the sustain period, the sustain pulse Su is alternately supplied to the scan electrodes Y and the sustain electrodes Z of the cell selected by the address discharge to perform the display discharge. At this time, a predetermined bias voltage Va having a different period is supplied to the data electrodes X (R), X (G), and X (B) on which the R, G, and B phosphors are disposed, respectively. The predetermined bias voltage Va supply period is adjusted by a timing controller (not shown).

At this time, the predetermined bias voltage Va supplied to the data electrode X includes an arbitrary voltage ranging from the ground voltage 0V to the positive polarity voltage. However, in consideration of the voltage source of the data electrode for supplying the data pulse during address discharge, in the case of the positive voltage, it is preferable to have the same voltage as the voltage for supplying the data pulse.

As such, when predetermined bias voltage waveforms having different periods are supplied to the data electrodes X (R), X (G), and X (B) on which the phosphors are arranged during the sustain period, the characteristics of the R, G, and B phosphors during the sustain discharge are provided. As a result, the amount of wall charge in the discharge cell can be adjusted, thereby securing a driving margin.

In addition, the sustain period is a display period of the plasma display panel, and when the different bias voltage supply periods are different for the data electrodes X (R), X (G), and X (B) on which the phosphors are disposed as in the present invention, Since the amount of phosphor emission can be controlled, problems such as a decrease in gray scale expression power when processing R, G, and B image signals for conventional color temperature correction do not occur.

The period in which the predetermined bias voltage Va is supplied to the data electrode on which each phosphor is arranged is long in order of the data electrode on which the green (G) -red (R) -blue (B) phosphor is arranged, depending on the ratio of the phosphor emission characteristics. It is preferable to.

At this time, the predetermined bias voltage Va supplied to the data electrodes X (R), X (G), and X (B) on which the R, G, and B phosphors are disposed is similar to that of the first and second embodiments. Although it can be supplied for each sustain period of the unit subfield for driving the plasma display panel, a sustain period in which one or more subfields are combined, for example, a sustain period in which two or three subfields are combined into one unit subfield. It may be supplied every time.

Eighth Embodiment

FIG. 13 illustrates driving waveforms according to a plasma display panel driving method according to an eighth embodiment of the present invention. Referring to FIG. 13, in the plasma display panel driving method according to the eighth embodiment of the present invention, as in the seventh embodiment of the present invention, a plurality of subfields having different emission counts are driven by being divided into an initialization period, an address period, and a sustain period. do.

In the initialization period, a rising ramp waveform (Ramp-up) is simultaneously supplied to all scan electrodes (Y) in the setup (SU) period, and a falling ramp waveform (Ramp-down) is supplied in the cells during the set-down (SD) period. The weak erase discharge causes some of the excessively formed wall charges to be erased.

Thereafter, in the address period, scan pulses are sequentially supplied to the scan electrodes Y, and at the same time, data pulses are supplied to the data electrodes X in synchronization with the scan pulses to generate addressing discharges.

Subsequently, in the sustain period, the sustain pulse Su is alternately supplied to the scan electrodes Y and the sustain electrodes Z of the cell selected by the address discharge to perform the display discharge. At this time, a predetermined bias voltage Va is supplied to the data electrode on which two phosphors of R, G, and B phosphors are disposed, respectively, X (R), X (G), and X (B). The supply period is the same, and a predetermined bias voltage Va having a different period is supplied to the data electrode on which the other phosphor is disposed, and the predetermined bias voltage supply period is adjusted by a timing controller (not shown).

The predetermined bias voltage Va supplied to the data electrode X includes any voltage ranging from the ground voltage 0V to the positive voltage. However, in consideration of the voltage source of the data electrode for supplying the data pulse during address discharge, in the case of the positive voltage, it is preferable to have the same voltage as the voltage for supplying the data pulse.

As such, data in which two phosphors among the data electrodes X (R), X (G), and X (B) in which the red (R), green (G), and blue (B) phosphors are arranged in the sustain period are arranged. A predetermined bias voltage of the same period is supplied to an electrode, for example, a data electrode on which red (R) and blue (B) phosphors are arranged, and a data electrode on which the remaining phosphors are disposed, eg, a green (G) phosphor, is disposed. If the above-mentioned data electrode is supplied to the data electrode in which the red (R) and blue (B) phosphors described above are disposed, red (R), green (G), and blue are discharged in the subsequent address period as in the fifth embodiment. (B) Since the amount of wall charges can be adjusted based on one of the phosphor discharge cells, the driving margin can be more easily secured.

In addition, the sustain period is a display period of the plasma display panel, in which two phosphors among the data electrodes X (R), X (G), and X (B) on which each phosphor is disposed are disposed on the data electrode, as shown in the present invention. When the predetermined bias voltage Va is supplied with the same bias voltage and the predetermined bias voltage Va having a different period is supplied to the data electrode on which the other phosphor is disposed, the phosphor discharge cell based on any one of the phosphor discharge cells Since the amount of emitted light can be adjusted, problems such as gray level expression deterioration are not generated when processing R, G, and B image signals for color temperature correction.

The predetermined bias voltage Va supplied to the data electrodes X (R), X (G), and X (B) on which the phosphors R, G, and B are disposed is driven as in the plasma display panel as in the fifth embodiment. Although it can be supplied for each sustain period of the unit subfield for the sustain period in which one or more subfields are combined, for example, it can also be supplied for each sustain period in which two or three subfields are combined into one unit subfield. .

As described above, it will be understood by those skilled in the art that the above-described technical configuration may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the 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 present invention can improve the driving waveform of the data electrode to correct the color temperature without degrading the gray scale expressive power, and improve the driving margin by adjusting the wall charge amount.

Claims (11)

A method of driving a plasma display panel in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. And a predetermined bias voltage supply period is driven to the data electrodes in which red (R), green (G), and blue (B) phosphors are disposed in the initialization period. A method of driving a plasma display panel in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. Predetermined bias voltage supply periods in which two phosphors are respectively supplied to the data electrode in which the red (R), green (G), and blue (B) phosphors are arranged in the initialization period are the same, and the other one is the same. And a predetermined bias voltage supply period supplied to the data electrode on which the phosphor is disposed is driven differently. The method according to claim 1 or 2, And said predetermined bias voltage comprises a positive polarity voltage and a ground voltage. The method according to claim 1 or 2, And the predetermined bias voltage is supplied and driven at every setup period of a unit subfield. The method according to claim 1 or 2, And the predetermined bias voltage is supplied and driven at every setup period combining one or more subfields. A method of driving a plasma display panel in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. And driving red and green (G) and blue (B) phosphors by varying a predetermined bias voltage supply period to the data electrodes disposed during the sustain period. A method of driving a plasma display panel in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. During the sustain period, a predetermined bias voltage supply period supplied to the data electrodes in which two phosphors are disposed among the data electrodes in which the red (R), green (G), and blue (B) phosphors are disposed is the same, and the other one is the same. And a predetermined bias voltage supply period supplied to the data electrode on which the phosphor is disposed is driven differently. The method according to claim 6 or 7, And said predetermined bias voltage comprises a positive polarity voltage and a ground voltage. The method of claim 6, And the predetermined bias voltage supply period is driven in the order of the data electrodes in which the green (G) -red (R) -blue (B) phosphors are arranged. The method according to claim 6 or 7, And the predetermined bias voltage is supplied and driven at each sustain period of the unit subfield. The method according to claim 6 or 7, And the predetermined bias voltage is supplied and driven for each sustain period combining one or more subfields.

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