KR100705838B1 - Plasma Display Apparatus and Driving Method therof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device and a driving method thereof for adjusting a voltage difference between a setdown pulse and a scan pulse supplied to a scan electrode (Y) in an address period. Further, the amount of wall charges lost in such an address period is reduced to stabilize the address discharge and the sustain discharge after the address period.

The plasma display device of the present invention includes a plasma display panel in which a plurality of sustain electrodes including scan electrodes and sustain electrodes are formed, a driver for supplying driving voltages to the plurality of sustain electrodes, and one or more sustain electrodes, respectively. In at least one sustain electrode group of the plurality of sustain electrode groups, the lowest voltage of the setdown pulse supplied to the scan electrode of the sustain electrode in the set down period of the reset period and the lowest of the scan pulse supplied to the scan electrode of the sustain electrode in the address period. And a drive pulse controller for causing a difference in voltage to be different from other sustain electrode groups.

Description

Plasma display device and driving method thereof {Plasma Display Apparatus and Driving Method therof}

1 is a diagram showing the structure of a typical plasma display panel.

2 is a diagram illustrating a method of implementing image gradation of a conventional plasma display apparatus.

3A to 3B illustrate driving waveforms according to a driving method of a conventional plasma display apparatus.

4 is a view for explaining wall charges distributed in a discharge cell by driving pulses supplied in a reset period and an address period in a conventional drive waveform.

FIG. 5 is a diagram for explaining in detail a scan pulse applied to a scan electrode Y in an address period in a conventional driving waveform; FIG.

6 is a view for explaining the distribution of wall charges in a discharge cell as the time from the end of the set-down to the time when the scan pulse is supplied to the scan electrodes is different for each of the scan electrodes Y ₁ to Y n.

7 is a view for explaining a plasma display device of the present invention.

8 is In order to explain the method of driving the plasma display device according to the present invention, the sustain electrodes formed on the plasma display panel are divided into two sustain electrode groups.

9 is In order to explain the driving method of the plasma display device according to the present invention, the sustain electrodes formed on the plasma display panel are divided into four sustain electrode groups.

FIG. 10 is a view for explaining an example of dividing a sustain electrode formed in a plasma display panel into a sustain electrode group including one or more different numbers of sustain electrodes; FIG.

11A to 11C are views for explaining driving waveforms according to the driving method of the plasma display device of the present invention.

12A to 12B are diagrams for explaining another driving waveform according to the driving method of the plasma display device of the present invention.

13A to 13C are diagrams for explaining an example in which the voltage difference between the setdown pulse and the scan pulse and the length of the supply period of the second sustain bias voltage Vzb2 are adjusted according to the scanning order of the sustain electrode group.

14A to 14B are views for explaining an example of a method of setting the difference in voltage between the setdown pulse and the scan pulse to two or more different values.

Fig. 15 is a view for explaining a change in distribution of wall charges in an address period according to the driving method of the present invention.

FIG. 16 is a view for explaining an example of a method for commonly connecting the sustain electrodes Z included in one sustaining electrode group. FIG.

FIG. 17 is a view for explaining an example of a method of adjusting a voltage difference between a setdown pulse and a scan pulse for each sustain electrode; FIG.

18 is a view for explaining an example of a method of including a rest period having a predetermined length between scan pulses of each sustain electrode group to prevent erroneous discharge between two adjacent sustain electrode groups.

<Explanation of symbols for the main parts of the drawings>

700: plasma display panel 701: driving pulse control unit

702: data driver 703: scan driver

704: sustain driver 705: drive voltage generator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display apparatus and a driving method thereof for adjusting a voltage difference between a setdown pulse and a scan pulse supplied to a scan electrode (Y) in an address period. will be.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet 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 illustrates a structure of a general plasma display panel.

As shown in FIG. 1, a plasma display panel includes a plurality of sustain electrodes formed by pairing scan electrodes 102 and Y and sustain electrodes 103 and Z on a front substrate 101, which is a display surface on which an image is displayed. The rear panel 110 on which the plurality of address electrodes 113 and X are arranged so as to intersect with the plurality of sustain electrodes on the front panel 100 and the rear substrate 111 forming the rear surface is disposed at a predetermined distance. And parallel to each other.

The front panel 100 includes scan electrodes 102 and Y and sustain electrodes 103 and Z for mutually discharging and maintaining light emission of the discharge cells, that is, transparent electrodes a formed of a transparent ITO material. The scan electrodes 102 and Y and the sustain electrodes 103 and Z provided as a bus electrode b made of a metal material are included in pairs. The scan electrodes 102 and Y and the sustain electrodes 103 and Z are covered by one or more upper dielectric layers 104 which limit the discharge current and insulate the electrode pairs, and discharge conditions on the upper dielectric layer 104 top surface. To facilitate, a protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

The rear panel 110 is arranged such that a plurality of discharge spaces, that is, barrier ribs 112 of a stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 113 and X, which perform 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 address electrodes 113 and X and the phosphor 114 to protect the address electrodes 113 and X.

Driving apparatuses for supplying a driving signal to a plurality of electrodes are coupled to the plasma display panel having such a structure to form a plasma display apparatus.

A method of implementing image gradation in the plasma display apparatus having such a structure is shown in FIG. 2.

2 is a diagram illustrating a method of implementing image grayscale of a conventional plasma display apparatus.

As shown in FIG. 2, in the conventional method of expressing a gray level in a plasma display apparatus, a frame is divided into several subfields having different number of emission times, and each subfield is again configured to reset the discharge cells. RPD), an address period APD for selecting a discharge cell to be discharged, and a sustain period SPD for implementing gray scale according to the number of discharges. For example, when displaying an image with 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. 2, and eight subfields. Each of the SFs SF1 to SF8 is divided into a reset period, an address period, and a sustain period.

The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting the discharge cell to be discharged is caused by the voltage difference between the address electrode X and the transparent electrode which is the scan electrode Y. The sustain period is increased at a rate of 2 ⁿ ( ^where n = 0, 1, 2, 3, 4, 5, 6, 7) in each subfield. In this way, since the sustain period is different in each subfield, the gray scale of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges.

The driving method of the conventional plasma display apparatus according to the general image gradation representation method will be described with reference to FIGS. 3A to 3B below.

3A to 3B illustrate driving waveforms according to a driving method of a conventional plasma display apparatus.

First, referring to FIG. 3A, the plasma display apparatus is driven by being divided into a reset period, an address period, and a sustain period as shown in FIG. 2. In addition, an erase period for erasing a portion of wall charges excessively formed in the discharge cell may be further included and driven.

In the reset period, the rising ramp waveform Ramp-up is applied to all the scan electrodes Y simultaneously. Due to this rising ramp waveform, weak dark discharge occurs in the discharge cell at the full screen. By this setup discharge, positive wall charges are accumulated on the address electrode X and the sustain electrode Z, and negative wall charges are accumulated on the scan electrode Y.

In the set-down period, 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 a specific voltage level below the ground (GND) level voltage. By generating a weak erase discharge in the discharge cell, the wall charges excessively formed in the discharge cell are sufficiently erased. By this set-down discharge, wall charges such that the address discharge can be stably generated remain uniformly in the discharge cells.

In the address period, a negative scan pulse falling from the scan reference voltage Vsc is sequentially applied to the scan electrode Y, and a positive data pulse is applied to the address electrode X in synchronization with the scan pulse. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, address discharge is generated in the discharge cell to which the data pulse is applied. In the discharge cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied. The sustain electrode Z is supplied with a positive sustain bias voltage Vz so that the voltage difference with the scan electrode Y is reduced during the set down period and the address period so that erroneous discharge with the scan electrode Y does not occur.

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

In addition, in the erase period after the sustain discharge is completed, a voltage of the erase 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 discharge cell of the full screen. You can.

Here, in FIG. 3A, the difference between the voltage of the setdown pulse supplied to the scan electrode Y in the setdown period and the scan pulse supplied to the scan electrode Y in the address period is set to be the same in all the scan electrodes. .

Referring to FIG. 3B, in the conventional plasma display apparatus driving method, a scan pulse applied to the scan electrode Y in the lowest voltage Vsetdown of the setdown pulse applied to the scan electrode Y and the address period in the setdown period of the reset period. The voltage difference [Delta] V from (-Vy) is set equally at all scan electrodes Y. In other words, the voltage difference (ΔV) between the lowest voltage (Vsetdown) of the setdown pulse and the scan pulse (-Vy) at the relatively fast scan order Y ₁ scan electrode is set down at the Yn scan electrode with a relatively late scan order. The voltage difference ΔV between the lowest voltage Vsetdown and the scan pulse −Vy of the pulse is the same.

The wall charges distributed in the discharge cells by the driving pulses supplied in the reset period and the address period in the driving waveform will be described with reference to FIG. 4.

4 is a diagram for explaining wall charges distributed in discharge cells by driving pulses supplied in a reset period and an address period in a conventional driving waveform.

4, in the setup period of the reset period, a pulse of a positive rising ramp is supplied to the scan electrode Y, and the sustain electrode Z and the address electrode X are supplied to the scan electrode Y described above. A pulse of a relatively lower voltage is supplied so that negative charges are positioned on the scan electrode Y, and positive charges are positioned on the sustain electrode Z and the address electrode X as shown in (a). Subsequently, in the set-down period, the pulse of the falling lamp is supplied to the scan electrode Y, and a predetermined bias voltage, preferably the sustain bias voltage Vzb, is supplied and maintained to the sustain electrode Z and the address electrode X. As shown in (b), the wall charges excessively accumulated in the discharge cells are partially erased during the setup period. Through such an erase process, the distribution of wall charges in each discharge cell is even. Subsequently, in the address period, an address discharge is generated as shown in (c) by the scan pulse supplied to the scan electrode Y and the data pulse supplied to the address electrode X.

On the other hand, in the address period, such address discharges are sequentially generated in accordance with the scanning order of the scan electrodes (Y). For example, referring to the case of FIG. 4, the difference in time required to proceed from (b) to (c) is different for each scan electrode (Y). As described above, the application time of the scan pulse for sequentially generating the address discharge is as shown in FIG. 5.

FIG. 5 is a diagram for explaining in detail a scan pulse applied to the scan electrode Y in an address period in a conventional driving waveform.

As shown in FIG. 5, in the conventional driving waveform, scan pulses are sequentially applied to each scan electrode Y according to the arrangement order of the scan electrodes Y ₁ to Yn. For example, as shown in FIG. 5, the scan pulse is first applied to the Y ₁ scan electrode having the fastest arrangement order on the plasma display panel, and the scan pulse is applied to the Y ₂ scan electrode subsequent to the scan pulse of Y ₁ . .

That is, the scan pulse applied to the Y ₁ scan electrode is supplied after the time t ₁ has elapsed at the end of the set-down of the reset period, and the scan pulse applied to the Y ₂ scan electrode is at the end of the set-down of the reset period. t a time of ₂ as is applied to the past since, Y ₃ scan electrode is applied to since the time t ₃ as in the time of set-down ends of the reset period and, Y _n scan electrodes at the end of the set-down of the reset period, The scan pulse is applied after a time of t _n . As described above, the scan pulses applied to all of the scan electrodes Y ₁ to Y n differ from each other in application time from the time when the set-down of the reset period ends.

Here, as the time from the end of the set-down of the reset period to the time when the scan pulses are supplied to the scan electrodes Y ₁ to Yn becomes longer, the rate at which wall charges decrease in the discharge cells increases. This is a problem caused by combining wall charges in the discharge cells with space charges floating in the space inside the discharge cells.

Accordingly, the later the scanning order is, the lower the amount of wall charges in the discharge cells at the time of the address discharge is generated. This will be described with reference to FIG. 6.

FIG. 6 is a view for explaining the distribution of wall charges in the discharge cells as the time from the end of the set-down to the time when the scan pulse is supplied to the scan electrodes is different for each of the scan electrodes Y ₁ to Y n.

Referring to FIG. 6, first, as in the case of the Y ₁ scan electrode of FIG. 5, when the time difference from the time when the reset period is set to the Y ₁ scan electrode to the time when the scan pulse is supplied is relatively short t ₁ , for example, FIG. 6. As shown in (a), the wall charge in the discharge cell is advantageous for the sustain discharge. Here, (a) illustrates that 12 negative charges on the scan electrode Y, 8 positive charges on the sustain electrode Z, and 4 positive charges on the address electrode X are distributed as an example. do.

Next, when the time difference from when the set-down of the reset period ends to the time when the scan pulse is applied to the Y ₂ scan electrode as in the Y ₂ scan electrode of FIG. 5 is relatively longer than t ₁ , t ₂ , for example, FIG. As shown in (b) of FIG. 6, the wall charge in the discharge cell is reduced by a certain amount compared to (a).

In case of Figure 5 the Y ₃ scan electrode and as Y ₃ scan electrode reset period, a set-down the scan pulse from the time is long t ₃ than t ₂ by the time difference and the time above that end of the include, for example, in Fig. 6 As shown in (c), the wall charge in the discharge cell is reduced by a certain amount compared to (a) and (b).

Next, when the time difference from when the set-down of the reset period is completed to the time when the scan pulse is applied to the Yn scan electrode as in the Yn scan electrode of FIG. 5 is t ₄ longer than t ₃ described above, for example, FIG. In the discharge cell, wall charges are reduced by a certain amount compared to (a), (b) and (c).

As the time difference increases from the end of the set-down period to the time when the scan pulse is applied in the reset period, that is, the amount of wall charges in the discharge cells decreases as the scan sequence is delayed, the wall charges formed in the set-down period This is because they are neutralized by combining with the space charges in the discharge cell as time passes.

In this way, each other for each of the scan electrodes (Y ₁ ~ Yn) When, from the end of the set-down scan pulse is the time difference and the time each different from each other are supplied to the intensity of the address discharge, each of the scan electrodes (Y ₁ ~ Yn) in Will be different. For example, as shown in FIG. 6, when a scan pulse is applied to the Y ₁ scan electrode to generate a data pulse and an address discharge applied to the corresponding address electrode X, the wall charge distribution as shown in (a) is Yn. In the case of (a), it is assumed that the scan pulse is applied to the scan electrode to have a data charge applied to the corresponding address electrode X and the wall charge distribution as shown in (b) at the time of generating the address discharge. Strong address discharge occurs, and in (d), a relatively weak address discharge occurs.

Thus, the brightness difference caused by the intensity of the address discharge are different, the intensity of the sustain discharge in the sustain period after the addition is different from one another, each of the scan electrodes (Y ₁ ~ Yn) in accordance with each of the scan electrodes (Y ₁ ~ Yn) There is a possibility.

In the case of (d), if the time difference from the end of the set-down period of the reset period to the time when the scan pulse is applied increases excessively and the wall charge in the discharge cell is excessively lost, subsequent sustain is performed. There is a problem that no discharge occurs.

In order to solve this problem, the present invention regulates the voltage difference between the setdown pulse and the scan pulse supplied to the scan electrode (Y) in the address period, thereby stabilizing the address discharge and at the same time each address discharge is applied to the scan electrode (Y). It is an object of the present invention to provide a plasma display device and a method of driving the same.

Plasma display device of the present invention for achieving the above object is a plasma display panel formed with a plurality of sustain electrodes including a scan electrode and a sustain electrode, a driving unit for supplying a driving voltage to the plurality of sustain electrodes and by controlling the driving unit, respectively One or more sustain electrode groups of the plurality of sustain electrode groups including one or more sustain electrodes are supplied to the scan electrodes of the sustain electrodes in the address period and the lowest voltage of the set-down pulses supplied to the scan electrodes of the sustain electrodes in the set-down period of the reset period. And a drive pulse controller for causing a difference in the lowest voltage of the scan pulse to be different from other sustain electrode groups.

The scanning order of all the scan electrodes included in the sustain electrode group including the plurality of sustain electrodes among the plurality of sustain electrode groups described above is continuous.

In addition, the number of the above-described sustain electrode group is two or more, characterized in that less than the total number of the sustain electrode.

The number of sustain electrode groups is two or more and four or less.

In addition, each of the sustain electrode groups is characterized by including the same number of the sustain electrodes.

In addition, at least one storage electrode group of the plurality of storage electrode groups may include a different number of the storage electrodes than the other storage electrode groups.

The driving pulse controller is a scan electrode of all sustain electrodes included in one sustain electrode group, and the difference between the lowest voltage of the setdown pulse supplied in the setdown period of the reset period and the minimum voltage of the scan pulse supplied in the address period is the same. It is characterized by that.

In addition, the sustain electrode group includes a first sustain electrode group and a second sustain electrode group having a scanning order slower than that of the first sustain electrode group, wherein the driving pulse controller is held in the set down period of the reset period in the first sustain electrode group. The difference between the lowest voltage of the setdown pulse supplied to the scan electrode of the electrode and the lowest voltage of the scan pulse supplied in the address period is smaller than the second sustain electrode group.

The driving pulse control unit may further reduce the magnitude of the sustain bias voltage supplied to the sustain electrodes of the second sustain electrode group in the address period than the first sustain electrode group.

The driving pulse control unit may include a plurality of sustain electrode groups including a first sustain electrode group and a second sustain electrode group in which the scan order is continuous with the first sustain electrode group and the scan order is later than that of the first sustain electrode group. A pause period during which the scan pulse is not supplied is included between a time point at which the scan pulse is supplied to the scan electrodes of the first sustain electrode group and a time point at which the scan pulse is supplied to the scan electrodes of the second sustain electrode group.

In addition, the driving pulse control unit is characterized in that the length of the rest period is 1 us (microsecond) or more and 100 us (microsecond) or less.

In addition, all of the sustain electrodes included in the plurality of sustain electrode groups may be connected in common to each of the sustain electrode groups.

In addition, the driving method of the plasma display device of the present invention for achieving the above object, in the driving method of the plasma display device formed with a plurality of sustain electrodes including a scan electrode and a sustain electrode, each comprising a plurality of sustain electrodes; In at least one sustain electrode group of the sustain electrode group, the difference between the lowest voltage of the setdown pulse supplied to the scan electrode of the sustain electrode in the set down period of the reset period and the minimum voltage of the scan pulse supplied to the scan electrode of the sustain electrode in the address period is different. It is characterized by being different from other storage electrode groups.

The scanning order of all scan electrodes included in the sustain electrode group including the plurality of sustain electrodes of the plurality of sustain electrode groups is continuous.

The number of sustain electrode groups may be two or more and less than the total number of sustain electrodes.

The number of sustain electrode groups is two or more and four or less.

In addition, each of the sustain electrode groups is characterized by including the same number of sustain electrodes.

In addition, at least one sustain electrode group of the plurality of sustain electrode groups may include a different number of sustain electrodes than the other sustain electrode groups.

In addition, the difference between the lowest voltage of the setdown pulse supplied to the scan electrodes of all sustain electrodes included in one sustaining electrode group in the setdown period of the reset period and the minimum voltage of the scan pulse supplied in the address period is the same. .

Further, the sustain electrode group includes a first sustain electrode group and a second sustain electrode group having a slower scanning order than the first sustain electrode group, and the first sustain electrode group serves as a scan electrode of the sustain electrode in a set-down period of a reset period. The difference between the lowest voltage of the supplied setdown pulse and the lowest voltage of the scan pulse supplied in the address period is smaller than that of the second sustain electrode group.

Further, the sustain bias voltage supplied to the sustain electrodes of the second sustain electrode group in the address period is smaller than the first sustain electrode group.

The plurality of sustaining electrode groups include a first sustaining electrode group, a first sustaining electrode group, and a second sustaining electrode group in which the scanning order is continuous and the scanning order is later than that of the first sustaining electrode group. And a pause period in which the scan pulse is not supplied between the time point at which the scan pulse is supplied to the scan electrode and the time point at which the scan pulse is supplied to the scan electrode of the second sustain electrode group.

In addition, the length of the rest period is characterized in that less than 1us (microseconds) 100us (microseconds).

In addition, all of the sustain electrodes included in the plurality of sustain electrode groups may be connected in common to each of the sustain electrode groups.

Hereinafter, a driving apparatus and method of a plasma display panel of the present invention will be described in detail with reference to the accompanying drawings.

7 is a view for explaining a plasma display device of the present invention.

As shown in FIG. 7, in the plasma display apparatus of the present invention, a sustain electrode including a scan electrode Y and a sustain electrode Z is formed, and an address electrode X formed in a direction crossing the sustain electrode is formed. A frame formed by a combination of at least one subfield in which a driving pulse is applied to the address electrode X, the scan electrode Y, and the sustain electrode Z in the reset period, the address period, and the sustain period. A plasma display panel 700, a data driver 702 for supplying data to the address electrode X formed on the plasma display panel 700, a scan driver 703 for driving the scan electrode Y, and The sustain driver 704 for driving the sustain electrode Z, which is a common electrode, and the scan driver 703 and the sustain when the plasma display panel 700 is driven. And a driving pulse controller 701 and a driving voltage generator 705 for supplying a driving voltage required for each driver (702, 703, 704) for controlling the east (704).

Here, the aforementioned plasma display panel 700 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals, and the plurality of electrodes, for example, the scan electrode (Y) and the sustain electrode ( A plurality of sustain electrodes including Z) are formed, and the address electrodes X are formed to intersect with the sustain electrodes including the scan electrodes Y and the sustain electrodes Z.

The data driver 702 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 702 samples and latches data in response to control of a timing controller (not shown), and then supplies the data to the address electrode X.

The scan driver 703 supplies the rising ramp waveform Ramp-up and the falling ramp waveform Ramp-down to the scan electrode Y during the reset period. In addition, the scan driver 703 sequentially supplies the scan pulse Sp of the negative scan voltage (-Vy) to the scan electrode Y during the address period, and applies the sustain pulse SUS to the scan electrode Y during the sustain period. Supplies).

The sustain driver 704 supplies the positive sustain bias voltage Vzb to the sustain electrode Z during the period in which the falling ramp waveform occurs and during the address period or during the address period, and the scan driver 703 during the sustain period. ) Is alternately operated to supply the sustain pulse SUS to the sustain electrode Z.

The driving pulse controller 701 generates a timing control signal for controlling the operation timing and synchronization of the scan driver 703 and the sustain driver 704 in the reset period, the address period, and the sustain period, and converts the timing control signal into the scan driver ( 703 and the sustain driver 704 control the scan driver 703 and the sustain driver 704, respectively. In particular, the driving pulse controller 701 controls the scan driver 703 described above, so that at least one of the sustain electrode groups among the plurality of sustain electrode groups each including at least one sustain electrode is disposed in the set down period of the reset period. The difference between the lowest voltage of the set-down pulse supplied to the scan electrode Y and the lowest voltage (-Vy) of the scan pulse SP supplied to the scan electrode Y of the sustain electrode in the address period is different from other sustain electrode groups. do.

The driving voltage generator 705 generates a setup voltage Vsetup, a scan reference voltage Vsc, a negative scan voltage -Vy, a sustain voltage Vs, a data voltage Vd, and the like. These driving voltages may vary depending on the composition of the discharge gas or the structure of the discharge cell.

Such a function of the plasma display device of the present invention will be more apparent in the following description of the driving method.

The driving method performed by the plasma display apparatus of the present invention having such a structure is as follows.

First, in the method of driving the plasma display apparatus of the present invention, a plurality of sustain electrodes including scan electrodes Y and sustain electrodes Z formed on the plasma display panel may include a plurality of sustain electrodes including one or more sustain electrodes in a scanning order. In one or more sustain electrode groups of the sustain electrode groups divided into the sustain electrode groups, one or more sustain electrode groups each of which includes one or more sustain electrodes. The difference between the lowest voltage of the setdown pulse supplied to Y) and the lowest voltage (-Vy) of the scan pulse SP supplied to the scan electrode Y of the sustain electrode in the address period is different from other sustain electrode groups. To this end, an example of a method of dividing the sustain electrodes into a plurality of sustain electrode groups will be described first with reference to FIG. 8.

8 is In order to explain the driving method of the plasma display device according to the present invention, the sustain electrodes formed on the plasma display panel are divided into two sustain electrode groups.

As shown in FIG. 8, the sustain electrode including the scan electrode Y and the sustain electrode Z is divided into the A holding electrode group 801 and the B holding electrode group 802 on the plasma display panel 800.

For example, the sustaining electrodes, for example, the A holding electrode group include the sustaining electrode from the a ₁ sustaining electrode to the (a (n) / 2) holding electrode, that is, the A holding electrode group is (a ₁ (Ya ₁ , Za ₁ ) a (n) / 2 (Ya (n) / 2, Za (n) / 2)) 801, the B holding electrode group is from the (b ((n / 2) +1)) holding electrode to the b (n Including sustain electrodes up to the sustain electrodes, i.e. (b ((n / 2) +1) (Yb ((n / 2) +1), Zb ((n / 2) +1) to b (n) ( Ybn, Zbn)) 802. The reason why the number of storage electrode groups described above is set to two is that driving one plasma display panel by dividing the plasma display panel into two regions, for example, a top and a bottom, is driven. This is because it is advantageous when considering the cost side of manufacturing.

Here, all the scan electrodes Y included in one sustaining electrode group have a continuous scan order. In other words, the storage electrodes including the predetermined number of scan electrodes Y are bundled in the scanning order and set as the storage electrode group. For example, in the case of Fig. 8, the A holding electrode group includes scan electrodes from the Ya ₁ scan electrode to the Ya (n / 2) scan electrode, and sustains from the Za ₁ sustain electrode to the Za (n / 2) sustain electrode. The electrode holding group includes a scan electrode from the Yb ((n / 2) +1) scan electrode to the Yb (n) scan electrode, and the Zb ((n / 2) +1) sustain electrode It includes a sustain electrode up to a Zb (n) sustain electrode, where the scan order is the Ya ₁ scan electrode of the A holding electrode group is the fastest, followed by Ya ₂ , and the order of the scan is Ya ₃ . Ya ((n / 2) -1)), Ya (n / 2), Yb ((n / 2) +1) ... Yb (n-1), Yb (n).

Meanwhile, although the plurality of storage electrodes formed on one plasma display panel are divided into two storage electrode groups in FIG. 8, the number of the storage electrode groups may be different from that of FIG. 8. Looking at it as follows.

9 is In order to explain the method of driving the plasma display device according to the present invention, the sustain electrodes formed on the plasma display panel are divided into four sustain electrode groups.

As shown in FIG. 9, the sustain electrode including the scan electrode Y and the sustain electrode Z is disposed on the plasma display panel 900 by the A holding electrode group, the B holding electrode group, the C holding electrode group, and the D holding electrode. Divide into counties.

For example, the sustaining electrodes, for example, the A holding electrode group include the sustaining electrode from the a ₁ sustaining electrode to the (a (n) / 4) holding electrode, that is, the A holding electrode group is (a ₁ (Ya ₁ , Za ₁ ) a (n) / 4 (Ya (n) / 4, Za (n) / 4)) 901, and the B holding electrode group is from b ((n / 4) +1) holding electrode to b (2n) / Up to four holding electrodes, i.e., (b ((n / 4) +1) (Yb ((n / 4) +1), Zb ((n / 4) +1)) to b (2n ) / 4 (Yb (2n) / 4, Zb (2n) / 4)) 902; in this way the C holding electrode group is (c ((2n / 4) +1)) (Yc ((2n / 4 ) +1), Zc ((2n / 4) +1)) to c (3n) / 4 (Yc (3n) / 4, Zc (3n) / 4)) 903, and the D holding electrode group is (d ((3n / 4) +1) (Yd ((3n / 4) +1), Zd ((3n / 4) +1) to d (n) (Yd (n), Zd (n))) 904 Here, the number of the above-described storage electrode groups is in a range of at least two to less than the total number of storage electrodes, that is, when the total number of storage electrodes is n, 2 ≦ N ≦ (n−1). ) Can be set between

Here again, the scan order of all the scan electrodes Y included in one sustaining electrode group is continuous.

In FIG. 9, the number of sustain electrodes included in each of the sustain electrode groups 901, 902, 903, and 904 is the same, but the number of sustain electrodes included in at least one of the plurality of sustain electrode groups is determined. It is also possible to set it differently from another storage electrode group. The number of sustain electrode groups can also be adjusted. As described above, an example of changing the number of sustain electrodes included in the sustain electrode group or adjusting the number of sustain electrode groups is as follows.

FIG. 10 is a diagram for describing an example of dividing a storage electrode formed on a plasma display panel into a storage electrode group including one or more different numbers of storage electrodes.

As shown in FIG. 10, the sustain electrode including the scan electrode Y and the sustain electrode Z is disposed on the plasma display panel 1000 by the A holding electrode group, the B holding electrode group, the C holding electrode group, and the D holding electrode. Group and E holding electrode group.

For example, assuming that the total number of sustain electrodes is 100 as shown in FIG. 10, such sustain electrodes, for example, the A sustain electrode group include sustain electrodes from one sustain electrode to 10 sustain electrodes, that is, A sustain electrodes. The electrode group is (1 (Y ₁ , Z ₁ ) 10 (Y ₁₀ , Z ₁₀ )) 1001, the B holding electrode group includes sustain electrodes from the 11 holding electrodes to the 15 holding electrodes, that is, (11 (Y ₁₁ , Z ₁₁ ) to 15 (Y ₁₅ , Z ₁₅ )) (1002), C holding electrode group is (16 (Y ₁₆ , Z ₁₆ ) (1003), D holding electrode group is (17 (Y ₁₇ , Z ₁₇ ) to 60 (Y ₆₀ , Z) ₆₀ )) 1004 and the E holding electrode group are divided to include (61 (Y ₆₁ , Z ₆₁ ) to 100 (Y ₁₀₀ , Z ₁₀₀ )) 1005. Thus, at least one of the holding electrode groups is included. The number of sustain electrodes to be different from each other is different from those of the other sustain electrode groups, as shown in FIG. to be.

In addition, the aforementioned C holding electrode group is a sustain electrode group including only one sustain electrode, that is, a ₁₆ sustain electrode including a Y ₁₆ scan electrode and a Z ₁₆ sustain electrode, unlike one of the other sustain electrode groups. This is the case of forming one sustain electrode group.

As described above, except in the case where one storage electrode forms one storage electrode group, the scan electrodes Y of all the storage electrodes included in the storage electrode group have a continuous scanning order. In other words, when one storage electrode group includes a plurality of scan electrodes, for example, Y ₁ , Y ₂ , and Y ₃ scan electrodes, the Y ₁ scan electrode, the Y ₂ scan electrode, and the Y ₃ scan electrode in the storage electrode group The scan order is continuous.

Here, each of the storage electrode groups includes a different number of storage electrodes, but alternatively, only a predetermined number of storage electrode groups selected from the plurality of storage electrode groups may include a different number of storage electrodes from other storage electrode groups. For example, the A holding electrode group includes ten sustain electrodes, the B holding electrode group includes another ten sustain electrodes, and the following C holding electrode group, D holding electrode group, E holding electrode group, Each F holding electrode group includes 20 sustain electrodes.

As described above, a driving method of the plasma display apparatus for dividing the sustain electrodes of the plasma display panel into a plurality of sustain electrode groups and dividing the sustain electrodes into four sustain electrode groups as shown in FIG. 9 is as follows.

11A to 11C are diagrams for describing a driving waveform according to the driving method of the plasma display device of the present invention.

First, referring to FIG. 11A, in the method of driving the plasma display device of the present invention, in one or more sustain electrode groups among the plurality of sustain electrode groups each including one or more sustain electrodes, the scan electrodes of the sustain electrodes in the set down period of the reset period The difference between the lowest voltage of the setdown pulse supplied to Y) and the lowest voltage of the scan pulse supplied to the scan electrode Y of the sustain electrode in the address period is different from other sustain electrode groups.

For example, when the sustain electrodes a ₁ to bn are divided into two sustain electrode groups, that is, the A sustain electrode group and the B sustain electrode group as shown in FIG. 8, one sustain electrode group of the two sustain electrode groups is shown. For example, in the B holding electrode group, the lowest voltage of the set down pulse supplied to the scan electrode Y of the sustain electrode in the set down period of the reset period is V2, and the scan pulse supplied to the scan electrode Y of the sustain electrode in the address period. The lowest voltage is -Vy and the difference is | -Vy |-| V2 |, that is, (absolute value of -Vy)-(absolute value of V2). On the other hand, in the A holding electrode group, the lowest voltage of the set down pulse supplied to the scan electrode Y of the sustain electrode in the set down period of the reset period is V1, and the scan pulse supplied to the scan electrode Y of the sustain electrode in the address period. The lowest voltage is -Vy and the difference is | -Vy |-| V1 |, that is, (absolute value of -Vy)-(absolute value of V1). This is shown in more detail in FIG. 11B.

Referring to FIG. 11B, the lowest voltage of the setdown pulse supplied to the scan electrode Y of the sustain electrode in the set down period of the reset period in the sustain electrode group A, and the scan pulse supplied to the scan electrode Y of the sustain electrode in the address period. The difference between the lowest voltages is? V1, which is the lowest voltage of the setdown pulse supplied to the scan electrode Y of the sustain electrode in the set down period of the reset period in the B sustain electrode group, and the scan electrode Y of the sustain electrode in the address period. The magnitude is smaller than [Delta] V2, which is the difference between the lowest voltages of the scan pulses supplied.

In other words, assuming that the sustain electrode group includes a first sustain electrode group and a second sustain electrode group having a slower scanning order than the first sustain electrode group, the first sustain electrode group having a relatively fast scan order. In the set down period of the reset period, the difference between the lowest voltage of the set down pulse supplied to the scan electrode Y of the sustain electrode and the lowest voltage of the scan pulse supplied in the address period is smaller than that of the second sustain electrode group.

At this time, the difference between the lowest voltage of the setdown pulse supplied to the scan electrodes (Y) of all the sustain electrodes included in one sustain electrode group in the setdown period of the reset period and the minimum voltage of the scan pulse supplied in the address period is the same. desirable. For example, the set down pulses are applied to all scan electrodes from the sustain electrodes included in the A sustain electrode group, that is, the Ya1 scan electrodes of the a1 sustain electrodes to the Y (a (n / 2)) scan electrodes of the a (n / 2) sustain electrodes. The difference between the lowest voltage and the lowest voltage of the scan pulse is ΔV1.

Meanwhile, as described above, the voltage difference between the setdown pulse and the scan pulse supplied to the sustain scan electrode Y is adjusted, and the magnitude of the sustain bias voltage supplied to the sustain electrode Z of the sustain electrode is adjusted. This is shown in Figure 11c.

Referring to FIG. 11C, the magnitude of the first sustain bias voltage Vzb1 supplied from the A sustaining electrode group to the sustain electrode Z in the address period of B is relatively small as ΔV1 in FIG. 11B. It is larger than the second sustain bias voltage Vzb2 of the sustain electrode group.

Here, it is preferable that the aforementioned second sustain bias voltage Vzb2 is larger than the voltage of the ground level GND and smaller than the first sustain bias voltage Vzb1.

The same sustain voltage as the aforementioned first sustain bias voltage Vzb1 is supplied to the sustain electrode Z before the second sustain bias voltage Vzb2 is supplied from the B holding electrode group, that is, in the set-down period of the reset period.

In more detail, assuming that the sustain electrodes are arranged in the same order as in FIG. 8 on the plasma display panel, and that the scan pulses SP are sequentially applied according to the arrangement order as shown in FIG. 8, the A sustain electrode group Scanning of the sustain electrodes in the set down period of the reset period in the B sustain electrode group including the sustain electrodes from the b ((n / 2) +1) sustain electrode to the bn sustain electrode in which the scan order is relatively slow among the The difference between the lowest voltage V2 of the setdown pulse supplied to the electrode Y and the lowest voltage (-Vy) of the scan pulse supplied to the scan electrode Y of the sustain electrode in the address period is ΔV2.

In the A holding electrode group including the sustaining electrode from the a ₁ sustaining electrode to the a (n / 2) sustaining electrode, which is relatively fast in scanning order, it is supplied to the scan electrode Y of the sustaining electrode in the set-down period of the reset period. The difference between the minimum voltage V1 of the setdown pulse and the minimum voltage (-Vy) of the scan pulse supplied to the scan electrode Y of the sustain electrode in the address period is ΔV1.

As described above, in the sustain electrode group including the scan electrode Y having a relatively late scan order, at the lowest voltage V2 and the address period of the set-down pulse supplied to the scan electrode Y of the sustain electrode in the set-down period of the reset period. The reason why the difference (ΔV2) of the minimum voltage (-Vy) of the scan pulses supplied to the scan electrode (Y) of the sustain electrode is larger than that of the sustain electrode group in which the scan order is relatively fast (ΔV1) is as follows. .

The fact that the scan order is fast means that the address discharge occurs within a relatively fast time after the reset discharge occurring in the reset period. In other words, the time difference from the time when the set-down of the reset period is completed to the time when the address discharge is generated by the scan pulse SP supplied to the scan electrode Y and the data pulse supplied to the address electrode X is relatively generated. It means short. Immediately after the reset discharge, many priming particles generated by the reset discharge exist in the discharge cell. Accordingly, the priming charges generated by the reset discharge may be sufficiently used in the scan electrode Y of the sustain electrode having the rapid scan order.

On the other hand, the late scan order means that the address discharge occurs after a relatively long time after the reset discharge occurring in the reset period. In other words, the time difference from the time when the set-down of the reset period is completed to the time when the address discharge is generated by the scan pulse SP supplied to the scan electrode and the data pulse supplied to the address electrode is relatively long. Here, the number of the priming charges described above is neutralized by decreasing with the space charges in the discharge cell as time passes. Accordingly, the priming charges generated by the reset discharge can be sufficiently used in the scan electrode of the sustain electrode in which the address discharge occurs after a relatively long time since the set-down time due to the relatively late scan order. There will be no.

Accordingly, in the sustain electrode group, in which the scan order is relatively late, for example, in the case of 11a, the lowest voltage V2 and the address of the setdown pulse supplied to the scan electrode Y of the sustain electrode in the set down period of the reset period are addressed. Set-down discharge that occurs during set-down by making the difference between the lowest voltage (-Vy) of the scan pulses supplied to the scan electrode Y of the sustain electrode in the period greater than ΔV1 of the A sustain electrode group in which the scan order is relatively fast with ΔV2. Relatively weakening reduces the amount of wall charge that disappears and disappears during this set-down period. As a result, the amount of wall charges located in the discharge cells at the beginning of the address period becomes relatively large compared to the A storage electrode group. As a result, as in the case of the B sustain electrode group, the scan order is relatively delayed so that even if the length of the period from the end of the set-down period to the time when the address discharge occurs is increased, the amount of wall charges in the discharge cells during the address discharge is relatively high. The scanning order is approximately the same as that of the fast A storage electrode group.

As a result, the address discharge in the B sustain electrode group is stabilized, and the amount of wall charges in the discharge cells in the A sustain electrode group and the amount of wall charges in the discharge cells in the B sustain electrode group are approximately equal. The address discharge is caused to occur evenly at all sustain electrodes.

In other words, in the sustain electrode group having a relatively late scan order, the amount of wall charges that are erased and disappeared in the set-down period is less than that of the sustain electrode group having the relatively faster scan order, thereby causing the address discharge in each sustain electrode group to be discharged. The amount of wall charges is approximately equal.

As a result, the address discharge is weakened or even the address discharge does not occur due to the lack of the number of priming charges present in the discharge cells.

Accordingly, it is possible to prevent deterioration of image quality when the plasma display device is driven.

Here, the second sustain bias voltage Vzb2 supplied to the sustain electrode Z of the sustain electrode of the B sustain electrode group having a relatively late scan order in the address period of the sustain electrode of the A sustain electrode group has a relatively high scan order. By making it smaller than the first sustain bias voltage Vzb1 supplied to the sustain electrode Z, the wall charges are combined with the space charges in the discharge cell until the address discharge occurs in the B sustain electrode group having a relatively late scan order. This suppresses disappearing and makes the address discharge more stable.

In other words, the second sustain bias voltage Vzb2 supplied to the sustain electrode Z of the sustain electrode of the B sustain electrode group having a relatively late scan order in the address period is held in the A sustain electrode group having a relatively rapid scan order. By making it smaller than the first sustain bias voltage Vzb1 supplied to the sustain electrode Z of the electrode, the negative wall charges are scanned at the time before the address discharge occurs after the set-down period in the B sustain electrode group. It is held in the upper part. Accordingly, by reducing the amount of wall charges reduced in the address period on the scan electrodes Y of the B holding electrode group, the address discharge is further stabilized and the sustain discharge after the address period is stabilized.

In FIG. 11A, the voltage having the same magnitude as that of the first sustain bias voltage Vzb1 is supplied to the sustain electrode Z in the set-down period of the reset period, but a voltage different from the first sustain bias voltage Vzb1 is supplied. It is also possible, which will be described with reference to the accompanying Figures 12a to 12b as follows.

12A to 12B are diagrams for describing another driving waveform according to the driving method of the plasma display device of the present invention.

First, referring to FIG. 12A, unlike the aforementioned FIG. 11A, the sustain electrode Z is supplied with the same voltage as that supplied in the address period in the set-down period of the reset period. For example, the first sustain bias voltage Vzb1 is supplied to the sustain electrode group to the sustain electrode Z in the address period, and the first sustain bias voltage Vzb1 is supplied to the sustain electrode Z in the set-down period of the reset period. Supplied. In addition, the second sustain bias voltage Vzb2 is supplied to the sustain electrode group Z in the address period in the address period, and the second sustain bias voltage Vzb2 is supplied to the sustain electrode Z in the set-down period in the reset period. do.

Next, referring to FIG. 12B, a voltage of the ground level GND is supplied to the sustain electrode Z in the set down period of the reset period unlike in FIGS. 11A to 12A. This stabilizes the voltage of the sustain electrode Z while supplying a ramp-down pulse in which the voltage gradually falls to the scan electrode Y in the set-down period, thereby providing more addressing in subsequent address periods. To be stable.

As a result, in the set-down period of the reset period, the sustain electrode Z is supplied with a voltage greater than or equal to the voltage of the ground level GND and less than or equal to the first sustain bias voltage Vzb1.

On the other hand, the above-described voltage difference between the set-down pulse and the scan pulse and the second sustain bias voltage (Vzb2) is preferably adjusted in size as the scan order of the corresponding sustain electrode group is changed, which is attached to FIGS. Referring to 13c as follows.

13A to 13C are diagrams for explaining an example in which the voltage difference between the setdown pulse and the scan pulse and the length of the supply period of the second sustain bias voltage Vzb2 are adjusted according to the scanning order of the sustain electrode group.

13A to 13C, first, a total of 100 sustain electrodes are formed on one plasma display panel as shown in FIG. 13A, and these 100 sustain electrodes include a Y1 scan electrode and a Z1 sustain electrode as shown in (a). A holding electrode group including up to 50 sustain electrodes including 1 sustain electrode to 50 sustain electrodes including the Y50 scan electrode and the Z50 sustain electrode, and a Y100 scan electrode and a Z100 sustain electrode from 51 sustain electrodes including the Y51 scan electrode and the Z51 sustain electrode. Assuming that the B holding electrode group including up to 100 sustain electrodes is divided into the B holding electrode groups, the B holding electrode group having a relatively slow scanning order among the A holding electrode groups and the B holding electrode group is maintained in the set down period of the reset period. Before scanning in the lowest voltage and address period of the setdown pulse supplied to the scan electrode Y of the electrode, that is, the Y51 scan electrode to the Y100 scan electrode. The difference between the minimum voltages of the scan pulses supplied to the poles Y, that is, the Y51 scan electrodes to the Y100 scan electrodes, is ΔV2 as in the case of FIG. 13B, which is larger than ΔV1 in the case of the A sustain electrode group. Here, it is confirmed that the voltage difference between the scan pulse and the setdown pulse in the B sustain electrode group is ΔV2.

On the other hand, in the case of (b) of FIG. 13A, these 100 sustain electrodes include A from 1 sustain electrode including the Y1 scan electrode and the Z1 sustain electrode to 90 sustain electrodes including the Y90 scan electrode and the Z90 sustain electrode. Assuming that the sustain electrode group is divided into the B sustain electrode group including the 91 sustain electrode including the Y91 scan electrode and the Z91 sustain electrode to the 100 sustain electrode including the Y100 scan electrode and the Z100 sustain electrode. In the B holding electrode group in which the scan order is relatively late among the sustain electrode group and the B holding electrode group, the minimum of the setdown pulses supplied to the scan electrode Y of the sustain electrode, that is, the Y91 scan electrode to the Y100 scan electrode, in the set down period of the reset period. The difference between the minimum voltages of the scan pulses supplied to the scan electrode Y, that is, the Y91 scan electrode to the Y100 scan electrode, in the voltage and address period is shown in FIG. 13B (b). As ΔV3 as Wo, and larger than the case of A sustaining electrode group ΔV1. Here, it is confirmed that the voltage difference between the scan pulse and the setdown pulse in the B sustain electrode group is ΔV3.

That is, the set down in the B holding electrode group in the case of FIG. 13A (b) including from the 91 sustain electrode including the Y91 scan electrode and the Z91 sustain electrode to the 100 sustain electrode including the Y100 scan electrode and the Z100 sustain electrode. (A) of FIG. 13A including the difference in voltage ΔV3 between the pulse and the scan pulse, from the 51 sustain electrode including the Y51 scan electrode and the Z51 sustain electrode to the 100 sustain electrode including the Y100 scan electrode and the Z100 sustain electrode. Is larger than the difference (ΔV2) of the voltage between the setdown pulse and the scan pulse in the B holding electrode group.

As a result, the difference in voltage between the setdown pulse and the scan pulse described above becomes longer as the scan order of the corresponding sustain electrode group is delayed.

In more detail, the voltage difference between the set-down pulse and the scan pulse is determined by the sustain electrode having the fastest scan order among the sustain electrodes included in the sustain electrode group. For example, in (a) of FIG. 13A, the sustain electrode having the fastest scanning order among 51 sustain electrodes included in the B sustain electrode group is 51 sustain electrode, and in (b), the sustain electrode included in the B sustain electrode group The sustain electrode of which the scan order is the fastest is 91 sustain electrode. At this time, if the voltage difference between the setdown pulse and the scan pulse in FIG. 13A (b), that is, (ΔV3) in the case of (b) in FIG. 13B is applied in the case of FIG. The setdown discharge is not sufficiently generated when set down to the 90 storage electrode, thereby increasing the possibility of difference in the amount of wall charge between the discharge cells. As a result, the voltage difference between the setdown pulse and the scan pulse described above is determined by the sustain electrode having the fastest scan order among the sustain electrodes included in the corresponding sustain electrode group.

Meanwhile, the voltage difference ΔV3 between the setdown pulse and the scan pulse in the B holding electrode group in the case of FIG. 13B (b) is the difference between the setdown pulse and the scan pulse in the B holding electrode group in the case of FIG. 13B (a). The reason for setting larger than the voltage difference DELTA V2 is to make the address discharge more stable by sufficiently securing the amount of wall charges that contribute to the address discharge in the address discharge in the sustain electrode group relatively late in the scan order.

13C, the magnitude of the sustain bias voltage Vzb3 supplied to the sustain electrode Z of the sustain electrode in the address period in the B sustain electrode group in the case of FIG. 13A (b) is determined as that of the A sustain electrode group. It is made smaller than the case Vzb1 and smaller than the sustain bias voltage Vzb2 supplied to the sustain electrode Z of the sustain electrode in the address period in the B sustain electrode group in the case of (a).

That is, in the case of (b) of FIG. 13A, the magnitude of the third sustain bias voltage Vzb3 supplied to the Z91 sustain electrode to the Z100 sustain electrode is the first to be supplied to the Z51 sustain electrode to the Z100 sustain electrode in the case of (a). 2 is smaller than the magnitude of the sustain bias voltage Vzb2. As a result, the magnitude of the sustain bias voltage supplied to the sustain electrode Z of the sustain electrode in the address period becomes smaller as the scanning order of the corresponding sustain electrode group is delayed.

Here, the voltage supplied to the sustain electrode Z in the set-down period is greater than the voltage of the ground level GND, and the first sustain bias voltage Vzb1 supplied to the sustain electrode Z of the storage electrode of the A storage electrode group of FIG. 13A. Since all voltages smaller than) may be applied, the voltage supplied to the sustain electrode Z in the set-down period is indicated by hatching.

In the above description, the voltage difference between the setdown pulse and the scan pulse has been described using only one value as an example. Alternatively, the voltage difference between the setdown pulse and the scan pulse may be set to have two or more different values. This will be described with reference to FIGS. 14A to 14B.

14A to 14B are diagrams for explaining an example of a method of setting a difference in voltage between a setdown pulse and a scan pulse to two or more different values.

Referring to FIGS. 14A to 14B, first, as shown in FIG. 14A, the sustain electrodes formed on one plasma display panel include four sustain electrode groups, that is, a sustain electrode group, a B sustain electrode group, a C sustain electrode group, and a D sustain electrode. In the case of dividing into groups, in the A storage electrode group having the fastest scanning order among the four storage electrode groups, the set-down pulse supplied to the scan electrode Y of the sustain electrode in the set-down period of the reset period and the scan electrode of the sustain electrode in the address period The voltage difference between the scan pulses supplied to (Y) is set to (ΔV1) as in the case of (a) of FIG. 14B.

In addition, in the B storage electrode group whose scanning order is later than that of the A storage electrode group described above, as shown in FIG. 14A, the set electrode is supplied to the scan electrode Y of the sustain electrode in the set down period of the reset period and the scan electrode of the sustain electrode in the address period. The voltage difference between the scan pulses supplied to (Y) is set to (ΔV2) as in the case of (a) of FIG. 14B, and in the C storage electrode group whose scanning order is later than that of the above-described A storage electrode group to B storage electrode group. The difference in voltage between the setdown pulse supplied to the scan electrode Y of the sustain electrode in the set-down period of the reset period and the scan pulse supplied to the scan electrode Y of the sustain electrode in the address period is the same as in the case of Fig. 14B (a). (DV3), and in the D storage electrode group whose scanning order is later than that of the above-described A storage electrode group, B storage electrode group, and C storage electrode group, the sustain electrode is set in the set-down period of the reset period. Sets the voltage difference between the set-down pulse and the scan is supplied to the scan electrode (Y) of the sustain electrode in the address period, pulses supplied to the can electrode (Y) to (ΔV4) as in the case of (a) in FIG. 14b.

Here, the relationship of (ΔV1) <(ΔV2) <(ΔV3) <(ΔV4) holds.

In addition, in the case of dividing the sustain electrodes formed on one plasma display panel into four sustain electrode groups, that is, A sustain electrode group, B sustain electrode group, C sustain electrode group, and D sustain electrode group as shown in FIG. 14A. In the A sustain electrode group having the fastest scanning order among the two sustain electrode groups, the voltage supplied to the sustain electrode Z of the sustain electrode in the address period is set to Vzb1, that is, the first sustain bias voltage as shown in FIG. 14B. Set it.

In addition, in the B storage electrode group whose scanning order is later than that of the above-described A storage electrode group as shown in FIG. 14A, the voltage supplied to the sustain electrode Z of the sustain electrode in the address period is set to Vzb2, as shown in FIG. 14B (b). That is, the voltage is supplied to the sustain electrode Z of the sustain electrode in the address period in the C sustain electrode group which is set to the second sustain bias voltage and whose scanning order is later than that of the above-described A sustain electrode group to the B sustain electrode group. As in the case of (b), Vzb3, that is, the third sustain bias voltage is set, and in the D sustaining electrode group whose scanning order is later than that of the A sustaining electrode group, the B sustaining electrode group, and the C sustaining electrode group described above, the sustaining electrode in the address period. The voltage supplied to the sustain electrode Z is set to Vzb4, that is, the fourth sustain bias voltage as in the case of FIG. 14B (b).

Here, the relationship Vzb4 <Vzb3 <Vzb2 <Vzb1 is established.

As described above, in the sustain electrode group having a relatively late scan order, the voltage difference between the set-down pulse and the scan pulse is smaller than that of the sustain electrode group having the relatively quick scan order, and the sustain electrode Z of the sustain electrode in the address period. If the voltage supplied to is smaller than the sustain electrode group having a relatively rapid scanning order, the amount of wall charge decreases relatively even if the length of the period from the end of the set-down to the time of the address discharge occurs becomes longer. . This will be described with reference to FIG. 15.

15 is a view for explaining a change in distribution of wall charges in an address period according to the driving method of the present invention.

Here, FIG. 15 is a view for explaining the change of wall charges in the address period according to the driving method of the present invention. It is noted that the distribution of wall charges in the address period does not necessarily follow the distribution tendency of FIG. 15.

Referring to FIG. 15, first, as in the case of the A holding electrode group of FIG. 14A, the difference in voltage between the setdown pulse and the scan pulse is set to a relatively small ΔV1 in the case where the scan order is the fastest, and the sustain electrode of the sustain electrode in the address period is set. In the case where the voltage supplied to (Z) is set to the first sustain bias voltage Vzb1, for example, as shown in Fig. 15A, wall charges are advantageous for sustain discharge. For example, in (a), 12 negative charges on the scan electrode Y, 8 positive charges on the sustain electrode Z, and 4 positive charges on the address electrode X are distributed.

Next, when the scan order is later than the above-described A sustaining electrode group as shown in FIG. 14A, the difference in voltage between the setdown pulse and the scan pulse is set to ΔV2 greater than the above-mentioned ΔV1, and the sustain electrode sustains in the address period. In the case where the voltage supplied to the electrode Z is set to the second sustain bias voltage Vzb2 which is smaller than the first sustain bias voltage Vzb1 described above, for example, the wall charges in the discharge cell of FIG. Similar to (a), it is distributed to favor sustain discharge.

Next, when the scan order is later than the above-described A sustaining electrode group and B sustaining electrode group as shown in FIG. 14A, the difference in voltage between the setdown pulse and the scan pulse is set to ΔV3 greater than the above ΔV1 and ΔV2. When the voltage supplied to the sustain electrode Z of the sustain electrode in the address period is set to the third sustain bias voltage Vzb3 smaller than the above-described first sustain bias voltage Vzb1 and the second sustain bias voltage Vzb2. For example, the wall charges are distributed in the discharge cells of Fig. 15 to favor sustain discharge similarly to (a) and (b).

Next, as shown in FIG. 14A, the difference between the set-down pulse and the scan pulse when the scan order is later than that of the A sustaining electrode group, the B sustaining electrode group, and the C sustaining electrode group described above is described in terms of ΔV1, ΔV2, and ΔV3. Is set to a larger ΔV4, and the voltage supplied to the sustain electrode Z of the sustain electrode in the address period is set to the first sustain bias voltage Vzb1, the second sustain bias voltage Vzb2, and the third sustain bias voltage ( In the case of setting to the fourth sustain bias voltage Vzb4 smaller than Vzb3), for example, the wall charges in the discharge cells in Fig. 15 (d) and the discharge cells are similar to the sustain discharge similarly to (a), (b) and (c). Distributed to advantage.

As a result, in all cases of FIGS. 15A, 15B, 15C, and 15D, the distribution of wall charges in the discharge cells at the time of the address discharge is equally evenly distributed. do. As a result, the distribution of wall charges in the discharge cells after the address discharge is advantageous for the subsequent sustain discharge.

As described above in detail, the sustain electrodes formed on the plasma display panel are divided into a plurality of sustain electrode groups, and one or more of the sustain electrode groups are scanned by the scan electrodes Y of the sustain electrodes in the address period. Before the pulse SP is supplied, in order to supply the first sustain bias voltage Vzb1 to the sustain electrode Z of the sustain electrode, the sustain electrodes Z included in each sustain electrode are commonly connected. Referring to Figure 16 as follows.

FIG. 16 is a view for explaining an example of a method for commonly connecting the sustain electrodes Z included in one sustaining electrode group.

Referring to FIG. 16, all of the sustain electrodes Z included in the plurality of sustain electrode groups are commonly connected to each of the sustain electrode groups. For example, one plasma display panel is formed with a total of 40 sustain electrodes, and each of the 40 sustain electrodes includes 10 sustain electrodes, that is, A sustain electrode group and B sustain electrode group. In the case of dividing into the C sustain electrode group and the D sustain electrode group, all the sustain electrodes Z of the sustain electrodes included in the A sustain electrode group, that is, all the sustain electrodes from the Z1 sustain electrode to the Z10 sustain electrode at the Za node Common connection. In addition, all the sustain electrodes Z of the sustain electrodes included in the B sustain electrode group, that is, all the sustain electrodes from the Z11 sustain electrodes to the Z20 sustain electrodes are commonly connected at the Zb node.

The reason for the common connection between the sustain electrodes Z of the sustain electrodes included in the same sustain electrode is that the sustain electrodes Z of all the sustain electrodes included in the same sustain electrode are supplied with the same driving pulse. This is because the common connection of the Z) s is preferable when considering the uniformity of driving.

In the above description, the present invention has been described in the case where the voltage difference between the setdown pulse and the scan pulse is adjusted for each sustain electrode group including a plurality of sustain electrodes. Alternatively, however, it is also possible to adjust the voltage difference between the setdown pulse and the scan pulse for each sustain electrode, which will be described below with reference to FIG. 17.

17 is a view for explaining an example of a method of adjusting the voltage difference between the setdown pulse and the scan pulse for each sustain electrode.

Referring to FIG. 17, in the one sustaining electrode including the Y1 scan electrode and the Z1 sustain electrode, the voltage difference between the set-down pulse and the scan pulse is ΔV1 and the voltage supplied to the sustain electrode Z of the sustain electrode in the address period is first. It is the sustain bias voltage Vzb1.

In addition, in the two sustain electrodes including the Y2 scan electrode and the Z2 sustain electrode, the voltage difference between the setdown pulse and the scan pulse is ΔV2 which is larger than ΔV1 described above, and the voltage supplied to the sustain electrode Z of the sustain electrode in the address period is The second sustain bias voltage Vzb2 is greater than the first sustain bias voltage Vzb1 described above.

Further, in the three sustain electrodes, the voltage difference between the setdown pulse and the scan pulse is ΔV3 which is larger than the above ΔV1 to ΔV2, and the voltage supplied to the sustain electrode Z of the sustain electrode in the address period is the first sustain bias voltage Vzb1 described above. ) And a third sustain bias voltage Vzb3 that is greater than the second sustain bias voltage Vzb2.

In this manner, the voltage difference between the setdown pulse and the scan pulse is different for each sustain electrode, and the voltage supplied to the sustain electrode Z in the address period is different for each sustain electrode.

As described above, the method for controlling the difference in voltage between the setdown pulse and the scan pulse for each sustain electrode is the same as the case where one sustain electrode constitutes one sustain electrode group.

As such, when the difference in voltage between the setdown pulse and the scan pulse is adjusted for each sustain electrode, the difference in the wall charge between the sustain electrodes in the address period can be minimized.

In such a driving method of the present invention, there is a possibility that an erroneous discharge occurs between two adjacent sustain electrodes in which the scanning order is continuous. In order to prevent this, the supply timing between the scan pulses between the sustain electrodes is adjusted.

FIG. 18 is a view for explaining an example of a method of including a rest period having a predetermined length between scan pulses of each sustain electrode group to prevent erroneous discharge between two adjacent sustain electrode groups.

Referring to FIG. 18, the plurality of sustaining electrode groups include a first sustaining electrode group and a second sustaining electrode group in which the scanning order is continuous with the first sustaining electrode group and the scanning order is later than that of the first sustaining electrode group. In the case where the second sustain electrode group and the scan order are continuous and include a third sustain electrode group whose scan order is later than that of the second sustain electrode group, the scan order among the sustain electrodes of the first sustain electrode group described above is different. A sustain electrode including the latest scan electrode (in this case, each sustain electrode group includes one sustain electrode, and in this case, the sustain electrode in the latest scan order includes a plurality of sustain electrodes of one sustain electrode group. In the case of including an electrode), the scan including the scan electrode Y having the earliest scan order among the time when the scan pulse is supplied and the sustain electrodes of the second sustain electrode group. A pause period of a predetermined length W is included between the time points at which the scan pulses are supplied from the electrodes. Here, the rest period W is a period in which the scan pulse is not supplied, and is a difference between the application time points of the scan pulses of two sustain electrode groups in which the scan order is continuous in time.

In addition, the length of the rest period is more preferably 1 us (microsecond) or more and 100 us (microsecond) or less.

In this way, a predetermined time difference is provided between the scan pulses supplied from the two sustain electrode groups having the continuous scan order, thereby preventing erroneous discharges occurring between two adjacent sustain electrodes in the address period.

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 appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. 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 in detail, the present invention adjusts the difference between the lowest voltage of the setdown pulse and the lowest voltage of the scan pulse in at least one or more of the sustain electrode groups including one or more sustain electrodes, and also maintains the sustain electrode Z of the sustain electrode. By controlling the magnitude of the sustain bias voltage to be supplied), it is possible to prevent the loss of wall charges required at the address discharge and to stabilize the address discharge, thereby suppressing deterioration of image quality.

Claims (24)

A plasma display panel in which a plurality of sustain electrodes including scan electrodes and sustain electrodes are formed; A driving unit supplying a driving voltage to the plurality of sustain electrodes; And One or more sustain electrode groups of the plurality of sustain electrode groups including one or more sustain electrodes are controlled to control the driving unit, and the lowest voltage and the address period of the set down pulse supplied to the scan electrodes of the sustain electrodes in the set down period of the reset period. A driving pulse controller configured to make a difference between a minimum voltage of scan pulses supplied to the scan electrodes of the sustain electrodes different from other sustain electrode groups; Plasma display device comprising a. The method of claim 1, And a scan order of all the scan electrodes included in the sustain electrode group including the plurality of sustain electrodes of the plurality of sustain electrode groups is continuous. The method of claim 1, The number of the sustain electrode group is two or more, the plasma display device, characterized in that less than the total number of the sustain electrode. The method of claim 3, wherein And the number of sustain electrode groups is two or more and four or less. The method of claim 1, And each of the sustain electrode groups includes the same number of sustain electrodes. The method of claim 1, At least one sustain electrode group of the plurality of sustain electrode groups includes a different number of sustain electrodes than other sustain electrode groups. The method of claim 1, The driving pulse controller The difference between the lowest voltage of the setdown pulse supplied in the set down period of the reset period and the minimum voltage of the scan pulse supplied in the address period to the scan electrodes of all the sustain electrodes included in one of the sustain electrode groups is the same. Plasma display device. The method of claim 1, The sustain electrode group includes a first sustain electrode group and a second sustain electrode group having a scan order slower than that of the first sustain electrode group. The driving pulse controller In the first sustain electrode group, a difference between the lowest voltage of the setdown pulse supplied to the scan electrode of the sustain electrode and the lowest voltage of the scan pulse supplied in the address period is greater than the second sustain electrode group in the setdown period of the reset period. Plasma display device characterized in that the small. The method of claim 8, The driving pulse controller And the sustain bias voltage supplied to the sustain electrode of the second sustain electrode group is smaller than the first sustain electrode group in the address period. The method of claim 1, The driving pulse controller The plurality of sustain electrode groups include a first sustain electrode group, and a second sustain electrode group in which the scan order is continuous with the first sustain electrode group and in which the scan order is later than that of the first sustain electrode group. And a pause period during which a scan pulse is not supplied between a time point at which a scan pulse is supplied to the scan electrodes of the first sustain electrode group and a time point at which the scan pulse is supplied to the scan electrodes of the second sustain electrode group. Plasma display device. The method of claim 10, The driving pulse controller And a length of the pause period is 1 us (microsecond) or more and 100 us (microsecond) or less. The method of claim 1, And all sustain electrodes included in the plurality of sustain electrode groups are commonly connected to each of the sustain electrode groups. A driving method of a plasma display device in which a plurality of sustain electrodes including scan electrodes and sustain electrodes are formed, In at least one sustain electrode group of the plurality of sustain electrode groups each including at least one sustain electrode, an image of the sustain electrode in the address period and the lowest voltage of a set down pulse supplied to the scan electrode of the sustain electrode in a set down period of a reset period. And a difference in the lowest voltage of the scan pulses supplied to the scan electrodes is different from that of the other sustain electrode groups. The method of claim 13, And a scanning order of all the scan electrodes included in the sustain electrode group including the plurality of sustain electrodes among the plurality of sustain electrode groups is continuous. The method of claim 13, And the number of the sustain electrode groups is two or more and the total number of the sustain electrodes is less than or equal to the total number of the sustain electrodes. The method of claim 15, And the number of the sustain electrode groups is two or more and four or less. The method of claim 13, And wherein each of the sustain electrode groups includes the same number of sustain electrodes. The method of claim 13, At least one sustain electrode group of the plurality of sustain electrode groups includes a different number of sustain electrodes than other sustain electrode groups. The method of claim 13, The difference between the lowest voltage of the setdown pulse supplied to the scan electrodes of all the sustain electrodes included in one of the sustain electrode groups in the setdown period of the reset period and the minimum voltage of the scan pulse supplied in the address period is the same. A method of driving a plasma display device. The method of claim 13, The sustain electrode group includes a first sustain electrode group and a second sustain electrode group having a scan order slower than that of the first sustain electrode group. In the first sustain electrode group, a difference between the lowest voltage of the setdown pulse supplied to the scan electrode of the sustain electrode and the lowest voltage of the scan pulse supplied in the address period is greater than the second sustain electrode group in the setdown period of the reset period. A method of driving a plasma display device, characterized in that small. The method of claim 20, And the magnitude of the sustain bias voltage supplied to the sustain electrode of the second sustain electrode group in the address period is smaller than that of the first sustain electrode group. The method of claim 13, The plurality of storage electrode groups include a first storage electrode group, and a second storage electrode group in which a scan order is continuous with the first storage electrode group and in which a scan order is later than that of the first storage electrode group. And a pause period in which the scan pulse is not supplied between a time point at which the scan pulse is supplied to the scan electrodes of the first sustain electrode group and a time point at which the scan pulse is supplied to the scan electrodes of the second sustain electrode group. A method of driving a plasma display device. The method of claim 22, And the length of the pause period is 1 us (microsecond) or more and 100 us (microsecond) or less. The method of claim 13, And all sustain electrodes included in the plurality of sustain electrode groups are commonly connected to each of the sustain electrode groups.

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