KR100747270B1 - Plasma Display Apparatus and Driving Method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a driving method thereof, which improve a waveform applied before an application period and a reset period in an address period, and a method of driving the same. By stabilizing, it is possible to suppress the deterioration of driving stability of the panel and to reduce the occurrence of erroneous discharge with temperature.

To achieve this object, the present invention provides a plasma display panel including a scan electrode and a sustain electrode, an address electrode intersecting the scan electrode and a sustain electrode, a driving unit for driving the electrodes, and a control unit for such a driving unit, thereby controlling a subfield of a frame. In the address period of at least one of the subfields, an application time point of a data pulse applied to one or more address electrode groups of the plurality of address electrode groups including one or more address electrodes is different from an application time point of the scan pulse applied to the scan electrode. The length of the sustain period, in which the sustain pulse is applied to the scan electrode or the sustain electrode, is characterized in that it comprises a driving pulse controller which is adjusted to reduce the space charge in the discharge cell.

Description

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

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

2 is a diagram for explaining an arrangement of electrodes formed on a plasma display panel.

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

4 is a view illustrating a driving waveform according to a driving method of a conventional plasma display apparatus.

FIG. 5 is a diagram for explaining application time of a pulse applied to an address period in a conventional method of driving a plasma display device. FIG.

FIG. 6 is a view for explaining generation of noise due to a pulse applied to an address period in a conventional method of driving a plasma display device; FIG.

FIG. 7 is a view for explaining mis-discharge according to temperature in a plasma display device operated with a driving waveform according to a conventional driving method.

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

9 is a view showing a driving waveform according to the first embodiment of the method of driving the plasma display device of the present invention.

Fig. 10 is a view showing another driving waveform according to the first embodiment of the method of driving the plasma display device of the present invention.

11A to 11E illustrate an example in which data pulses are applied to the address electrodes X ₁ to Xn at different times from the time when the scan pulses are applied to the driving electrodes according to the driving method of the plasma display apparatus of the present invention. .

12A to 12B are diagrams for explaining noise reduced by the drive waveform of the present invention.

Fig. 13 is a view for explaining the division of address electrodes X ₁ to Xn into four address electrode groups in order to explain another driving waveform according to the second embodiment of the method of driving the plasma display device of the present invention.

14A to 14C are diagrams illustrating an application method of dividing address electrodes X ₁ to Xn into a plurality of electrode groups in a driving waveform according to a second embodiment of the method of driving a plasma display device, and applying a scan pulse to each electrode group. Figure 1 shows an example of applying a data pulse at different time points.

15 is a view showing an example in which the application time of the scan pulse and the application time of the data pulse are different from each other in the frame in the driving waveform according to the third embodiment of the method of driving the plasma display device of the present invention.

16A to 16C illustrate the driving waveforms of FIG. 15 in more detail.

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

800: plasma display panel 801: driving pulse control unit

802: data driver 803: scan driver

804: sustain driver 805: 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 device and a driving method thereof for improving a waveform applied to a time point at which a pulse is applied in an address period and a sustain period. It is about.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form a 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 front panel including a plurality of sustain electrode pairs formed by pairing a scan electrode 102 and a sustain electrode 103 on a front substrate 101, which is a display surface on which an image is displayed. A rear panel 110 having a plurality of address electrodes 113 arranged to intersect the plurality of storage electrode pairs described above on the back substrate 111 constituting the back surface 100 and the rear surface is coupled in parallel with a predetermined distance therebetween. .

The front panel 100 is made of a scan electrode 102 and a sustain electrode 103, that is, a transparent electrode (a) formed of a transparent ITO material and a metal material to mutually discharge and maintain light emission of the cells in one discharge cell. The scan electrode 102 and the sustain electrode 103 provided as the bus electrode b are included in pairs. The scan electrode 102 and the sustain electrode 103 are covered by one or more upper dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and to facilitate the discharge conditions on the upper dielectric layer 104 top surface. 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 which perform address discharge to generate vacuum ultraviolet rays are arranged in parallel with the partition wall 112. On the upper side of the rear substrate 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 electrode 113 and the phosphor 114 to protect the address electrode 113.

In the plasma display panel having such a structure, electrodes are formed in a matrix structure, which will be described with reference to FIG. 2.

2 is a view for explaining an arrangement of electrodes formed on a plasma display panel.

Referring to FIG. 2, scan electrodes Y1 to Yn are formed in parallel with the sustain electrodes Z1 to Zn on the plasma display panel 20, and the scan electrodes Y1 to Yn and the sustain electrodes Z1 to Zn are formed on the plasma display panel 20. The address electrodes X1 to Xm are formed to cross each other.

The discharge cells are formed at the intersections of the scan electrodes Y1 to Yn, the sustain electrodes Z1 to Zn, and the address electrodes X1 to Xm. Accordingly, the discharge cells are formed in a matrix form on the plasma display panel.

The driving circuits for supplying a predetermined pulse to the plasma display panel having the electrode array structure are attached to the plasma display apparatus.

A method of implementing image gradation in such a plasma display apparatus is shown in FIG. 3.

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

As shown in FIG. 3, in the conventional method of expressing a gray level in a plasma display apparatus, a frame is divided into several subfields having different emission counts, and each subfield has a reset period (RPD) for initializing all cells. ) Is divided into an address period APD for selecting a cell to be discharged and a sustain period SPD for implementing gradation 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. Each of the fields 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 cell to be discharged is caused by the voltage difference between the address electrode and the transparent electrode which is the scan electrode. 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.

Looking at the driving waveform according to the driving method of the plasma display device as shown in FIG.

4 is a view illustrating a driving waveform according to a driving method of a conventional plasma display apparatus.

As shown in Fig. 4, the plasma display apparatus erases a reset period for initializing all cells, an address period for selecting a cell to be discharged, a sustain period for maintaining the discharge of the selected cell, and wall charges in the discharged cell. It is divided into an erase period for driving.

In the reset period, the rising ramp waveform Ramp-up is applied to all the scan electrodes Y simultaneously. This rising ramp waveform causes weak dark discharge within the full discharge cells. 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.

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

In the address period, the negative scan pulses are sequentially applied to the scan electrodes Y, and the positive data pulses are applied to the address electrodes X in synchronization with the scan pulses. 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 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 is supplied with a positive polarity voltage Vz during the set down period and the address period so as to reduce the voltage difference with the scan electrode so as to prevent mis-discharge with the scan electrode.

In the sustain period, a sustain pulse Su is applied to the scan electrode Y and the sustain electrodes Z alternately. In the 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 cell are added.

After the sustain discharge is completed, an additional erasing period may be additionally included. In this erasing period, a voltage of an erase ramp waveform (Ramp-ers) having a small pulse width and a small voltage level is supplied to the sustain electrode Z to provide a full screen. It will erase the wall charge remaining in the cells.

In the plasma display apparatus driven by the driving waveform, the application time of the scan pulse applied to the scan electrode Y and the data pulses applied to the address electrodes X ₁ to Xn in the address period are the same. The application time of the scan pulse and the data pulse in the address period in the conventional driving method is as follows.

FIG. 5 is a view for explaining a timing of applying a pulse applied to an address period in a conventional method of driving a plasma display apparatus.

As shown in FIG. 5, in the driving method of the conventional plasma display apparatus, all data pulses applied to the address electrodes X ₁ to Xn in the address period are simultaneously generated with the scan pulses applied to the scan electrode Y. Is approved. As described above, when the data pulse and the scan pulse are applied to the address electrodes X ₁ to Xn and the scan electrode Y at the same time, the noise is applied to the waveform applied to the scan electrode Y and the waveform applied to the sustain electrode Z. (Noise) occurs. An example in which noise generated when the data pulse and the scan pulse are applied to the address electrodes X ₁ to Xn and the scan electrode at the same time point will be described with reference to FIG. 6.

FIG. 6 is a view for explaining generation of noise due to a pulse applied to an address period in a conventional method of driving a plasma display apparatus.

As shown in FIG. 6, when a data pulse and a scan pulse are applied to the address electrodes X ₁ to Xn and the scan electrode Y in the address period in the conventional plasma display device driving method, the scan electrode Y and the sustain are respectively applied. Noise occurs in the waveform applied to the electrode Z. Such noise is caused by coupling through the capacitance of the panel, and rising noise occurs in a waveform applied to the scan electrode Y and the sustain electrode Z when the data pulse is rapidly rising. When the data pulse falls sharply, falling noise is generated in the waveforms applied to the scan electrode Y and the sustain electrode Z. FIG.

As described above, noise generated in a waveform applied to the scan electrode Y and the sustain electrode Z by a data pulse applied to the address electrode X simultaneously with the scan pulse applied to the scan electrode Y is an address period. There is a problem in that the driving efficiency of the plasma display panel is reduced by making the address discharge unstable.

In addition, in the conventional plasma display apparatus driven by such a driving waveform, an erroneous discharge occurs generally due to the temperature around the panel. Looking at the mis-discharge according to this temperature as shown in FIG.

FIG. 7 is a view for explaining mis-discharge according to temperature in a plasma display device operated with a driving waveform according to a conventional driving method.

Referring to FIG. 7, in the plasma display apparatus operating with a driving waveform according to a conventional driving method, when the temperature around the panel is relatively high, the recombination ratio of the space charge 701 and the wall charge 700 in the discharge cell is high. As the absolute amount of wall charges participating in the discharge increases, the false discharge occurs. Here, unlike the wall charge 700 described above, the charge existing in the space in the discharge cell of the space charge 701 described above does not participate in the discharge.

For example, in the address period, the recombination ratio of the space charge 701 and the wall charge 700 increases, so that the amount of the wall charge 700 participating in the address discharge decreases, making the address discharge unstable. In this case, the address discharge becomes more unstable because the more the time for the addressing is backward, the more sufficient time for recombination of the space charge 701 and the wall charge 700 is secured. As a result, high temperature false discharge occurs such that the discharge cells that are turned on in the address period are turned off in the sustain period.

In addition, when sustain discharge occurs in the sustain period when the temperature around the panel is relatively high, the speed of the space charge 701 is increased during the discharge, and thus the recombination rate of the space charge 701 and the wall charge 700 is accordingly increased. This increases. Accordingly, the high temperature such that the amount of the wall charge 700 participating in the sustain discharge is reduced by the recombination of the space charge 701 and the wall charge 700 after any one sustain discharge, so that the next sustain discharge does not occur. There is a problem that an incorrect discharge occurs.

In order to solve this problem, the present invention makes the application point of the data pulse applied to the address electrode X different from the application point of the scan pulse applied to the scan electrode Y in the address period, and also in the sustain period. SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display device and a method of driving the same, which improve the waveform to be applied to reduce the generation of noise and to reduce the generation of the mis-discharge according to the temperature while suppressing the reduction of the address margin.

A plasma display device of the present invention for achieving the above object is a plasma display panel including a scan electrode and a sustain electrode, an address electrode intersecting the scan electrode and the sustain electrode, a drive unit for driving the electrodes and the drive unit By controlling, in the address period of at least one of the subfields of the frame, the application time of the data pulse applied to one or more address electrode groups of the plurality of address electrode groups including one or more of the address electrodes is the scan electrode. And a driving pulse controller which is different from the time point at which the scan pulse is applied, and the length of the sustain period in which the sustain pulse is applied to the scan electrode or the sustain electrode is adjusted to reduce the space charge in the discharge cell. The.

The driving pulse controller may be configured so that the application point of the data pulse applied to the at least one address electrode group in the address period is earlier than the application point of the scan pulse applied to the scan electrode.

The driving pulse controller may be configured so that the application point of the data pulses applied to all the address electrode groups in the address period is earlier than the application point of the scan pulses applied to the scan electrodes.

The driving pulse controller may be configured such that an application point of the data pulse applied to at least one address electrode group in the address period is later than an application point of the scan pulse applied to the scan electrode.

The driving pulse controller may be configured so that the application point of the data pulses applied to all the address electrode groups in the address period is later than the application point of the scan pulses applied to the scan electrodes.

In addition, the number of the address electrode group is two or more, characterized in that less than the total number of the address electrode.

The address electrode group may include one or more of the address electrodes.

In addition, the address electrode group may all include the same number of the address electrodes or one or more different numbers of the address electrodes.

The driving pulse controller may be configured to apply the data pulse to all the address electrodes included in one address electrode group at the same time.

The driving pulse controller may be configured to make the difference between the application point of the scan pulse and the application point of the data pulse closest to the application point of the scan pulse within the subfield the same or different.

In addition, the driving pulse controller is characterized in that the difference between the application time of the scan pulse and the application time of the data pulse closest to the application time of the scan pulse in the subfield is 10ns or more and 1000ns or less.

The driving pulse controller may further include a difference between an application point of the scan pulse and an application point of the data pulse that is closest to the application point of the scan pulse in the subfield. It is characterized by having a value.

In addition, the driving pulse controller is characterized in that the difference between the application time of the two data pulses that are applied at different time to the two or more different address electrode group is the same or different.

In addition, the driving pulse control unit is characterized in that the difference in the application time point between the two data pulses applied at different time points to two or more different address electrode groups is 10ns or more and 1000ns or less.

The driving pulse controller may be configured such that a difference in application time between two data pulses applied at different time points to two or more different address electrode groups has a value of 1/100 times or more than 1 time of a predetermined scan pulse width. It features.

The driving pulse controller may be configured such that the subfield whose length of the sustain period is adjusted is all subfields of the plurality of subfields.

In addition, the adjustment of the length of the sustain period is characterized by adjusting the period from the time when the last sustain pulse is applied to the reset period of the next subfield in the sustain period.

The period from the time point at which the last sustain pulse is supplied to the reset period of the next subfield in the sustain period is 100 ms or more and 1 ms or less.

In addition, the period from the end of the supply of the last sustain pulse to the reset period of the next subfield in the sustain period is a period in which the last sustain pulse applied in the sustain period maintains the ground level (GND). do.

In addition, the supply period of the last sustain pulse supplied in the sustain period is characterized in that more than 1 kHz or less than 1 kHz.

In addition, the supply period of the last sustain pulse supplied in the sustain period is characterized in that the last sustain pulse applied in the sustain period maintains the sustain voltage (Vs).

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 comprising a scan electrode and a sustain electrode, the address electrode crossing the scan electrode and the sustain electrode, the frame In the address period of at least one of the subfields of the subfields, a time point of applying a data pulse applied to one or more address electrode groups among a plurality of address electrode groups including one or more of the address electrodes is a scan applied to the scan electrode. The length of the sustain period, which is different from the application point of the pulse and the sustain pulse is applied to the scan electrode or the sustain electrode, is adjusted to reduce the space charge in the discharge cell.

In addition, an application time point of the data pulse applied to the at least one address electrode group in the address period may be earlier than an application time point of the scan pulse applied to the scan electrode.

In addition, the application point of the data pulse applied to all the address electrode group in the address period is characterized in that it is ahead of the application point of the scan pulse applied to the scan electrode.

In addition, the application point of the data pulse applied to the at least one address electrode group in the address period is later than the application point of the scan pulse applied to the scan electrode.

In addition, the application point of the data pulses applied to all the address electrode groups in the address period is later than the application point of the scan pulse applied to the scan electrode.

In addition, the number of the address electrode group is two or more, characterized in that less than the total number of the address electrode.

The address electrode group may include one or more of the address electrodes.

In addition, the address electrode group may all include the same number of the address electrodes or one or more different numbers of the address electrodes.

In addition, the data pulse is applied to all the address electrodes included in one address electrode group at the same time.

In addition, the difference between the application time of the scan pulse and the application time of the data pulse closest to the application time of the scan pulse in the subfield is the same or different.

The difference between the application point of the scan pulse and the application point of the data pulse closest to the application point of the scan pulse in the subfield is 10 ns or more and 1000 ns or less.

In addition, the difference between the application time of the scan pulse and the application time of the data pulse closest to the application time of the scan pulse in the subfield has a value of 1/100 times or more than 1 times the predetermined scan pulse width. It is done.

Further, the difference between the application time points of the two data pulses applied at different time points to two or more different address electrode groups may be the same or different.

In addition, the difference between the application time points between the two data pulses applied at different time points to two or more different address electrode groups may be 10 ns or more and 1000 ns or less.

In addition, the difference in the application time point between the two data pulses that are applied at different time points to two or more different address electrode groups is characterized by having a value of 1/100 times or more than 1 time of the predetermined scan pulse width.

The subfield whose length of the sustain period is adjusted may be all subfields of the plurality of subfields.

In addition, the adjustment of the length of the sustain period is characterized by adjusting the period from the time when the last sustain pulse is applied to the reset period of the next subfield in the sustain period.

The period from the time point at which the last sustain pulse is supplied to the reset period of the next subfield in the sustain period is 100 ms or more and 1 ms or less.

In addition, the period from the end of the supply of the last sustain pulse to the reset period of the next subfield in the sustain period is a period in which the last sustain pulse applied in the sustain period maintains the ground level (GND). do.

In addition, the supply period of the last sustain pulse supplied in the sustain period is characterized in that more than 1 kHz or less than 1 kHz.

In addition, the supply period of the last sustain pulse supplied in the sustain period is characterized in that the last sustain pulse applied in the sustain period maintains the sustain voltage (Vs).

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

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

Referring to FIG. 8, the plasma display apparatus of the present invention includes a sustain electrode including a scan electrode Y and a sustain electrode Z, and includes an address electrode X formed in a direction crossing the sustain electrode. Plasma display representing an image made up of a frame by a combination of at least one subfield to 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 data driver 802 for supplying data to the address electrode X formed on the panel 800, the plasma display panel 800, a scan driver 803 for driving the scan electrode Y, and a common electrode. The sustain driver 804 for driving the sustain electrode Z, the data driver 802, and the scan driver 803 when the plasma display panel 800 is driven. And a sustain driver 704, a driving pulse controller 801 and each of the driving voltage for supplying the driving voltage required for the driving unit (802, 803, 804) generating unit (805) for controlling.

Here, the above-described plasma display panel 800 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals, and a plurality of electrodes, for example, the scan electrode (Y) and the sustain electrode (Z). A plurality of sustain electrodes including () are formed, and an address electrode (X) is formed to intersect the sustain electrodes including the scan electrodes (Y) and the sustain electrodes (Z).

The data driver 802 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like, and then data mapped to each subfield is supplied by the subfield mapping circuit. The data driver 802 samples and latches input data, and then supplies the data to the address electrode X.

The scan driver 803 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 803 sequentially supplies the scan pulse Sp of the negative scan voltage (-Vy) to the scan electrode Y during the address period, and supplies the sustain pulse SUS to the scan electrode Y during the sustain period. Supplies).

The sustain driver 804 supplies the positive sustain bias voltage Vzb to the sustain electrode Z during the falling ramp waveform and during the address period and the address period, and the scan driver 803 during the sustain period. ) Is alternately operated to supply the sustain pulse SUS to the sustain electrode Z.

The driving pulse controller 801 generates a timing control signal for controlling the operation timing and synchronization of the data driver 802, the scan driver 803, or the sustain driver 804 in the address period and the sustain period, and generates the timing control signal. The data driver 802, the scan driver 803, or the sustain driver 804 are controlled by supplying the data driver 802, the scan driver 803, or the sustain driver 804. In particular, the driving pulse controller 801 controls the data driver 802, the scan driver 803, or the sustain driver 804 described above, so that at least one of the subfields of the frame in the address period of one of the subfields of the frame is controlled. The application time point of the data pulse applied to one or more address electrode groups among the plurality of address electrode groups including the address electrode X is different from the application time point of the scan pulse applied to the scan electrode Y. Or the length of the sustain period in which the sustain pulse is applied to the sustain electrode Z is adjusted to reduce the space charge in the discharge cell.

Here, the address electrode group including one or more address electrodes, the adjustment of the length of the sustain period, and the like will be described in more detail in the following description of the driving method.

The driving voltage generator 805 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.

Looking at the driving method performed by the plasma display device of the present invention having such a configuration as follows.

9 is a view showing a driving waveform according to the first embodiment of the driving method of the plasma display device of the present invention.

As shown in FIG. 9, in the driving waveform according to the driving method of the plasma display apparatus of the present invention, an application time point of data pulses applied to all the address electrodes X ₁ to Xn in an address period of one subfield is applied to the scan electrode. It is different from the application point of the applied scan pulse, and the length of the sustain period is adjusted to reduce the space charge in the discharge cell.

The adjustment of the length of the sustain period is preferably to adjust the period from the time when the last sustain pulse SUS _L is applied in the sustain period to the reset period of the next subfield. For example, at the time when the last sustain pulse SUS _L is supplied to the scan electrode Y or the sustain electrode Z in the sustain period of the first subfield, t0 is the second subfield after the first subfield. Assuming that the reset period starts at the time t1, then adjust the period between t0-t1 of the adjustment of the length of the sustain period.

Here, the adjustment of the length of the sustain period is achieved by adjusting the period from the time point at which the last sustain pulse is supplied to the reset period of the next subfield in the sustain period. That is, the length of the entire sustain period is adjusted by adjusting the period from the time when the last sustain pulse is supplied to the reset period of the next subfield.

Here, it is preferable that the period from the end of the supply of the last sustain pulse SUS _L to the reset period of the next subfield in the sustain period is 100 ms or more and 1 ms or less. In this case, the supply of the last sustain pulse SUS _L described above is ended when the voltage of the last sustain pulse SUS _L becomes approximately 10% or less of the maximum voltage. In other words, assuming that the maximum voltage of the last sustain pulse SUS _L is 200V, the supply of the last sustain pulse SUS _L is ended when the voltage of the last sustain pulse SUS _L becomes approximately 20V or less.

Preferably, the period from the end of the supply of the last sustain pulse to the reset period of the next subfield in the sustain period is the last sustain pulse SUS _L among the sustain pulses applied in the sustain period as shown in FIG. 9A. It is a period W _S1 for maintaining the ground level GND after falling from Vs) to the ground level GND.

In this manner, when the period from the end of the supply of the last sustain pulse SUS _L to the reset period of the next subfield in the sustain period is adjusted to be within the range of 100 mW or more and 1 mW or less, the temperature of the plasma display panel becomes high. For example, when the temperature is 40 ° C. or higher, erroneous discharge occurs due to the temperature of the plasma display panel, which reduces the space charge in the discharge cell, which is the main cause of the erroneous discharge.

In this way, if the period from the end of the supply of the last sustain pulse SUS _L to the reset period of the next subfield in the sustain period is set sufficiently long, the space charge is reduced after the supply of the last sustain pulse SUS _L. Enough time is secured. As a result, the space charge in the discharge cells is reduced.

As described above, the space charge in the discharge cell is recombined with the wall charge located on the predetermined electrode in the discharge cell, thereby reducing the absolute amount of the wall charge, which is the charge participating in the discharge. As a result, reducing the amount of space charge in the discharge cell can reduce the occurrence of high temperature mis-discharge that occurs when the temperature around the panel is a relatively high high temperature.

The reason why the period from the end of the supply of the last sustain pulse SUS _{L to} the reset period of the next subfield is 100 ms or more, that is, the reason why the lower limit threshold is set to 100 ms is the reason of the plasma display panel. The reason is that the space charge generated during the sustain discharge can be sufficiently reduced, and the period from the end of the supply of the last sustain pulse SUS _{L to} the reset period of the next subfield is 1 ms or less, that is, The reason why the upper limit threshold is set to 1 ms is to ensure the operating margin of the sustain period during sustain driving of the plasma display panel.

In FIG. 9, when the length of the sustain period is adjusted, the length of the sustain period is adjusted by adjusting the period from the end of the supply of the last sustain pulse SUS _L to the reset period of the next subfield. It is also possible to adjust the length of the entire sustain period by adjusting the supply period of the pulse. This will be described with reference to FIG. 10.

10 is a view showing another driving waveform according to the first embodiment of the method of driving a plasma display device of the present invention.

Referring to Figure 10, by adjusting the supply period of the sustain pulse, that is, the last sustain pulse (SUS _L ) for causing the last sustain discharge in the sustain period, the length of the entire sustain period, that is, at the time when the last sustain pulse in the sustain period is applied The length of the period until the reset period of the subfield is adjusted.

Here, considering that the sustain voltage Vs is alternately applied to the scan electrode or the sustain electrode in the sustain period, the supply period of the sustain pulse for generating the last sustain discharge in the sustain period is the last sustain pulse applied in the sustain period (SUS _L). Is preferably a period in which the sustain voltage Vs is maintained. In this sustain period, the supply period of the last sustain pulse SUS _L is preferably adjusted within a range of 1 mW or more and 1 mW or less.

Here, the reason why the supply period of the last sustain pulse SUS _L for generating the last sustain discharge in the sustain period is set to 1 ms or more, that is, the reason why the lower limit threshold is set to 1 ms is desired during the sustain discharge of the plasma display panel. The reason why the supply period of the last sustain pulse (SUS _L ) for generating the last sustain discharge in the sustain period is set to 1 ms or less, i.e., the upper limit threshold is set to 1 ms In order to sufficiently reduce the space charge generated during the discharge and at the same time to ensure the operating margin of the sustain period during the sustain driving of the plasma display device.

In the present invention, the subfield in which the length of the sustain period is adjusted as described above may be arbitrarily selected within one frame. For example, the driving waveform according to the driving method of the plasma display apparatus according to the present invention is formed by a combination of a plurality of subfields in which a predetermined voltage is applied to the address electrode, the scan electrode, and the sustain electrode in the reset period, the address period, and the sustain period. In consideration of representing an image, when selecting a subfield in which the length of the sustain period is adjusted, it is preferable to select all subfields of one frame in order to more effectively improve high temperature misdischarge. That is, the sustain period is adjusted in the sustain periods of all subfields of one frame.

On the other hand, as described above, when the application time of the scan pulse applied to the scan electrode (Y) and the data pulse applied to the address electrode (X) in the address period is described as follows.

In the address period, a method of applying a scan pulse applied to the scan electrode Y and a data pulse applied to the address electrodes X ₁ to Xn may be variously modified. X ₁ to Xn) have a method of applying a data pulse at a time different from the application time of the scan pulse. Looking at this method is the same as Figure 11a to 11e.

11A to 11E illustrate an example of applying data pulses to the address electrodes X ₁ to Xn at different time points from the time when the scan pulse is applied to each of the driving waveforms according to the driving method of the plasma display apparatus of the present invention. to be.

First, referring to FIGS. 11A to 11E, a method of differently applying a scan pulse and a data pulse in the driving waveform of the present invention may include applying a data pulse applied to the address electrodes X ₁ to Xn in an address period of one subfield. The time points are different from the time points at which the scan pulses applied to the scan electrodes Y are applied. For example, as shown in FIG. 11A, the driving waveform according to the driving method of the present invention corresponds to the arrangement order of the address electrodes X ₁ to Xn when it is assumed that the time of application of the scan pulse applied to the scan electrode Y is ts. The data pulse is applied to the address electrode X ₁ at a time point 2Δt before the time when the scan pulse is applied to the scan electrode Y, that is, the time point ts-2Δt. In addition, a data pulse is applied to the address electrode X ₂ at a time point Δt ahead of the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts-Δt. In this way, a data pulse is applied at the time ts + Δt to the X (n-1) electrode and a data pulse is applied at the time ts + 2Δt to the Xn electrode. That is, as shown in FIG. 11A, the data pulses applied to the address electrodes X ₁ to Xn are applied before or after the time point at which the scan pulses applied to the scan electrodes Y are applied. Unlike FIG. 11A, the application point of the data pulse applied to the address electrodes X ₁ to Xn is set differently from the application point of the scan pulse applied to the scan electrode Y, and at least one address electrode X ₁ to Xn is provided. ) May be set to be later than the application of the scan pulse, which is illustrated in FIG. 11B.

Referring to FIG. 11B, unlike in FIG. 11A, the driving waveform of the present invention is different from the application point of the data pulse applied to the address electrodes X ₁ to Xn and the application time of the scan pulse applied to the scan electrode Y. The application point of the data pulse is later than the application point of the scan pulse described above. In FIG. 11B, the application point of all data pulses is set later than the application point of the scan pulse, but only one application point of the data pulse may be set later than the application point of the scan pulse, and later than the application point of the scan pulse. The number of data pulses applied is changeable. For example, as shown in FIG. 11B, the driving waveform according to the driving method of the present invention is based on the arrangement order of the address electrodes X ₁ to Xn when it is assumed that the time point of applying the scan pulse applied to the scan electrode Y is ts. The data pulse is applied to the address electrode X ₁ at a time point Δt later than the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts + Δt. In addition, a data pulse is applied to the address electrode X ₂ at a time point 2Δt later than the time point at which the scan pulse is applied to the scan electrode Y, that is, time point ts + 2Δt. In this way, a data pulse is applied to the X ₃ electrode at the time point ts + 3Δt and a data pulse is applied to the Xn electrode at the time point ts + (n-1) Δt. That is, as shown in FIG. 11B, the data pulses applied to the address electrodes X ₁ to Xn are applied after the time point at which the scan pulses applied to the scan electrodes Y are applied. The region A in which the discharge occurs in the driving waveform of FIG. 11B will be described with reference to FIG. 11C. For example, the address discharge start voltage (Firing Voltage) is 170V, the scan pulse voltage is 100V, and the voltage of the data pulse. Is 70 V, the difference in voltage between the scan electrode Y and the address electrode X ₁ becomes 100 V due to the scan pulse applied to the scan electrode Y first in the region A, and Δt after the application of the above-described scan pulse. and after the elapsed time of the address electrode voltage difference between the scan electrode (Y) by the data pulses applied to address electrodes X ₁ and X ₁ rises to 170V. As a result, the voltage difference between the scan electrode Y and the address electrode X ₁ becomes the address discharge start voltage and an address discharge occurs between the scan electrode Y and the address electrode X ₁ . Unlike FIG. 11B, the application point of the data pulse applied to the address electrodes X ₁ to Xn is set differently from the application point of the scan pulse applied to the scan electrode Y, and the application point of the data pulse is applied. It may be set to be ahead of the view point, as shown in Figure 11d.

Referring to FIG. 11D, unlike in FIG. 11A or FIG. 11B, the driving waveform of the present invention is different from the application point of the scan pulse applied to the scan electrode Y when the data pulse is applied to the address electrodes X ₁ to Xn. Also, the application point of all data pulses is earlier than the application point of the above-described scan pulse. In FIG. 11D, the application point of all the data pulses is set to be earlier than the application point of the scan pulse. However, only the application point of one data pulse may be set to be earlier than the application point of the scan pulse described above. The number of data pulses applied earlier is changeable. For example, as shown in FIG. 11D, the driving waveform according to the driving method of the present invention is based on the arrangement order of the address electrodes X ₁ to Xn when it is assumed that the time of application of the scan pulse applied to the scan electrode Y is ts. The data pulse is applied to the address electrode X ₁ at a time point Δt ahead of the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts-Δt. In addition, a data pulse is applied to the address electrode X ₂ at a time point 2Δt ahead of the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts-2Δt. In this way, a data pulse is applied at the time point ts-3Δt to the X ₃ electrode and a data pulse is applied at the time point ts- (n-1) Δt to the Xn electrode. That is, as illustrated in FIG. 11D, the data pulses applied to the address electrodes X ₁ to Xn are applied before the time point at which the scan pulses applied to the scan electrodes Y are applied. Referring to FIG. 11E, the region B where the discharge occurs in the driving waveform of FIG. 11D will be described with reference to FIG. 11E. For example, the address discharge start voltage is 170V, the scan pulse voltage is 100V, and the data pulse Assuming that the voltage is 70 V, the voltage difference between the scan electrode Y and the address electrode X ₁ becomes 70 V by the data pulse applied to the address electrode X ₁ first in the region B, and Δt after the application of the data pulse described above. After a time elapses, the voltage difference between the scan electrode Y and the address electrodes X ₁ to Xn rises to 170V due to the scan pulse applied to the scan electrode Y. As a result, the voltage difference between the scan electrode Y and the address electrode X ₁ becomes the address discharge start voltage and an address discharge occurs between the scan electrode Y and the address electrode X ₁ .

Here Figure 11a through 11e in the scan electrode (Y) address electrodes (X ₁ a time difference or a time between application time points of data pulses applied to the application of the scan pulse applied to the time and the address electrode (X ₁ ~ Xn) ~ Xn in The difference in time of application between the data pulses applied to) is explained by the concept of Δt. Here, referring to Δt described above, for example, the application time of the scan pulse applied to the scan electrode Y is ts, and the time difference between the application time ts between the application pulse ts and the closest data pulse is Δt. The difference between the application time point ts of the scan pulse and the next adjacent data pulse is referred to as Δt twice, that is, 2Δt. This Δt remains constant. That is, while the applying time point of the data pulse applied to the scan electrode scan application time point and the address electrode (X ₁ ~ Xn) of the pulse applied to the (Y) different from each another are applied to each of the address electrodes (X ₁ ~ Xn) The difference between the application points between the data pulses is equal to each other. Here, the difference between the application time points between the data pulses applied to the respective address electrodes X ₁ to Xn in one subfield is the same, and the data pulses closest to the application time of the scan pulse and the application time of the scan pulse are the same. The difference between the points of application may be the same, or they may be different. For example, the difference between the application time points between the data pulses applied to the respective address electrodes X ₁ to Xn in one subfield is equal to each other, and closest to the application time ts of the scan pulse in any one address period. When the time difference between application points between data pulses is Δt, the time difference between application points between the data pulses closest to the application point ts of scan pulses in another address period in the same subfield is 2Δt. In this case, the time difference between the application point ts of the scan pulse and the application point between the closest data pulses is preferably set to 10 nanoseconds (ns) or more and 1000 nanoseconds (ns) or less in consideration of the time of the limited address period. Further, in view of any one of the scan pulse widths in accordance with the driving of the plasma display panel, it is preferable that Δt is set within a range of 1/100 times to 1 times the predetermined scan pulse width. For example, assuming that the width of one scan pulse is 1 microsecond (microseconds), as described above, the time difference between application points is 1/100 of 1 microsecond (microseconds), that is, 10 nanoseconds (ns) or more. It has a range of 1 times (microseconds), that is, 1000 nanoseconds (ns) or less.

In addition, the time difference between the application time between the data pulses may be different while the application time of the scan pulse and the application time of the data pulses are different. That is, while the application time of the data pulses applied to the address electrodes X ₁ to Xn is different from the application time of the scan pulses applied to the scan electrodes Y, the data pulses applied to the address electrodes X ₁ to Xn are different from each other. Set the application time point differently. For example, suppose that the time of application of the scan pulse applied to the scan electrode Y is ts, and the time difference between the time of application of the scan pulse and the time of application between the closest data pulses is Δt. Then, the difference in time of application between adjacent data pulses may be 3Δt. For example, if the time when the scan pulse is applied to the scan electrode Y is 0 nanoseconds, the data pulse is applied to the address electrode X ₁ at the time of 10 nanoseconds (ns). Accordingly, the time difference between the application time of the scan pulse applied to the scan electrode Y and the application time of the data pulse applied to the address electrode X ₁ is 10 nanoseconds (ns). Then, a data pulse is applied to the address electrode X ₂ at a time of 20 nanoseconds (ns), so that the application time of the scan pulse applied to the scan electrode Y and the data pulse applied to the address electrode X ₂ are applied. according to a time difference between the time of 20 nanoseconds (ns) and to this, an address electrode data is time and the address electrode is a time difference between the time point of data pulse applied to the X ₂ of the pulse applied to the X ₁ is 10 nanoseconds (ns). Then, when the data pulse is applied to the next address electrode X ₃ at 40 nanoseconds (ns), the time point at which the scan pulse is applied to the scan electrode Y and the time point at which the data pulse is applied to the address electrode X ₃ are applied. The time difference between them is 40 nanoseconds (ns), and accordingly, the time difference between the application time of the data pulses applied to the address electrode X ₂ and the application time of the data pulses applied to the address electrode X ₃ is 20 nanoseconds (ns). That is, the data applied to the scan electrode (Y) scanning each of the address electrodes (X ₁ ~ Xn) while differently applying time point of the data pulse applied to the application of the pulse time and the address electrode (X ₁ ~ Xn) to be applied to the The difference between the application time points between the pulses may be set differently.

Here, the time difference Δt between the time of applying the scan pulse applied to each scan electrode Y and the time of applying the data pulse applied to the address electrodes X ₁ to Xn is 10 nanoseconds (ns) or more and 1000 nanoseconds (ns) or less. It is preferable to be set. In view of the predetermined scan pulse width according to the driving of the plasma display panel, it is preferable that Δt is set within a range of 1/100 to 1 times the predetermined scan pulse width.

When the thus different from the application time points of data pulses applied to the scan application time point and the address electrode (X ₁ ~ Xn) of the pulse applied to the scan electrode (Y) during the address period is applied to word dress electrodes (X ₁ ~ Xn) At each application point of the data pulse, the coupling through the panel capacitance is reduced to reduce the noise of the waveform applied to the scan electrode and the sustain electrode. This noise reduction will be described with reference to FIGS. 12A to 12B.

12A to 12B are diagrams for explaining noise reduced by the driving waveform of the present invention.

12A, noise of waveforms applied to the scan electrode and the sustain electrode is substantially reduced compared to FIG. 6. Such noise is shown in more detail in FIG. 12B. Reason for this noise reduction is not applied to the data pulse at the same time as applying time point of a scan pulse applied to the scan electrode (Y) to all the address electrodes (X ₁ ~ Xn), each of the address electrodes (X ₁ ~ Xn By applying a data pulse at a time different from the time when the scan pulse is applied to each other and reducing coupling through the capacitance of the panel at each time, the scan electrode and the sustain electrode at the time when the data pulse is rapidly rising This is because the rising noise generated in the waveform applied to the waveform is reduced, and the falling noise generated in the waveform applied to the scan electrode and the sustain electrode is reduced when the data pulse falls rapidly. As a result, the address discharge occurring in the address period is stabilized to suppress the deterioration of the driving stability of the plasma display panel.

As a result, by stabilizing the address discharge of the plasma display panel, a single scan method for scanning the entire panel with one driving unit can be applied.

On the other hand, in the above case, the data pulse is applied to all the address electrodes X ₁ to Xn at a time different from that of the application of the scan pulse applied to the scan electrodes in a state in which the preliminary reset period is included between the sustain period and the reset period. While, in contrast, at least some of the data pulse different from that applied to the address electrodes (X ₁ ~ Xn) one is applied at the same time, the address electrodes at least the following two or more (n-1) pieces from the address electrodes (X ₁ ~ Xn) It is also possible to. This method is the same as the second embodiment of the method of driving the plasma display device according to the present invention.

13 is In order to explain another driving waveform according to the second embodiment of the method of driving the plasma display device according to the present invention, the address electrodes X ₁ to X n are divided into four address electrode groups.

In the second embodiment of the driving method of the plasma display apparatus of the present invention, only the difference in the application time of the scan pulse applied to the scan electrode Y and the data pulse applied to the address electrode X in the address period is shown. Explain. However, the second embodiment of the driving method of the present invention is basically the same as the first embodiment of the driving method described above, and thus, the second embodiment of the present invention also maintains the space charge in the discharge cell in the sustain period as in the first embodiment. The length of the sustain period is adjusted to reduce it. Since the adjustment of the sustain period of this second embodiment is substantially the same as that of the first embodiment, overlapping description is omitted. In addition, the display in drawing is abbreviate | omitted.

As shown in FIG. 13, the second embodiment of the driving method of the plasma display apparatus of the present invention includes the address X ₁ to Xn electrodes of the plasma display panel 1300, for example, the Xa electrode group Xa ₁ to Xa. (n) / 4) 1301, Xb electrode group Xb (n + 1) / 4 to Xb (2n) / 4) 1302, Xc electrode group Xc (2n + 1) / 4 to Xc (3n 4) (1303) and the Xd electrode group (Xd (3n + 1) / 4 to Xd (n)) (1304), and scanning is performed on at least one of the address electrode groups. The data pulse is applied at a time different from that of applying the scan pulse applied to the electrode Y. That is, a data pulse is applied to all of the electrodes Xa ₁ to Xa (n) / 4 belonging to the Xa electrode group 1301 at a different time from that of the scan pulse applied to the scan electrode Y. The application time points of the data pulses applied to the electrodes Xa ₁ to Xa (n) / 4 belonging to one Xa electrode group 1301 are all the same. In addition, the electrodes belonging to the other electrode groups 1302, 1303, and 1304 may be different from the application point of the data pulses of the electrodes Xa ₁ to Xa (n) / 4 belonging to the Xa electrode group 1301. When the data pulse is applied, the application point of the data pulse applied to the electrodes belonging to the other address electrode groups 1302, 1303, and 1304 is the same as the application point of the scan pulse applied to the scan electrode Y, or Can be different.

In FIG. 13, the number of address electrodes included in each address electrode group 1301, 1302, 1303, and 1304 is the same, but the number of address electrodes included in each address electrode group 1301, 1302, 1303, and 1304 is the same. It is also possible to set the different from each other. The number of address electrode groups can also be adjusted. Further, the number of such address electrode groups may be set between a minimum of two or more and a range smaller than the total number of maximum address electrodes, that is, 2 ≦ N ≦ (n−1).

Here, the concept of the address electrode group in FIG. 13 is incorporated in the above-described case of FIG. 9. In the case of FIG. 9, the address electrodes X ₁ to Xn of the plasma display panel are divided into a plurality of address electrode groups, respectively. The address electrode group in is a case where each includes one address electrode.

An application time point of a data pulse applied to the plasma display panel divided into four address electrode groups will be described with reference to FIGS. 14A to 14C.

14A to 14C are diagrams illustrating an application method of dividing address electrodes X ₁ to Xn into a plurality of electrode groups in a driving waveform according to a second embodiment of the method of driving a plasma display device, and applying a scan pulse to each electrode group. And an example of applying data pulses at different time points.

As shown in FIGS. 14A to 14C, the driving waveforms of the present invention include a plurality of address electrodes X ₁ to Xn, as in the case of FIG. 13, and a plurality of address electrode groups (Xa electrode group, Xb electrode group, and Xc). The time of application of the data pulse applied to the address electrodes X ₁ to Xn of the at least one address electrode group among the plurality of address electrode groups in the address period of the subfield is divided into the scan electrode Y Is different from the point of time when the scan pulse is applied. In this case, although not shown in the drawing, the length of the sustain period is adjusted to reduce the amount of space charge in the discharge cells as in the driving method of the plasma display apparatus of the present invention described above.

As described above, by adjusting the length of the sustain period, the occurrence of high temperature misdischarge is suppressed as described above.

In addition, the timing of application of the scan pulse applied to the scan electrode Y and the application of the data pulse applied to the address electrodes X ₁ to Xn are different from each other, thereby preventing address discharge from becoming unstable and suppressing deterioration of driving stability. do. This increases the driving efficiency. For example, as shown in FIG. 14A, assuming that the time point of applying the scan pulse applied to the scan electrode Y is ts, the Xa electrode group is arranged in accordance with the arrangement order of the address electrode groups including the address electrodes X ₁ to Xn. The data pulses are applied to the included address electrodes (Xa ₁ to Xa (n) / 4) at a time point 2Δt ahead of the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts-2Δt. At the address electrodes Xb (n + 1) / 4 to Xb (2n) / 4 included in the Xb electrode group, a time point Δt ahead of the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts-Δt In this manner, data pulses are applied at the time points ts + Δt to the address electrodes Xc (2n + 1) / 4 to Xc (3n) / 4 included in the Xc electrode group. Data pulses are applied to the address electrodes Xd (3n + 1) / 4 to Xd (n) included in the electrode group at the time point ts + 2Δt. The data pulses applied to the respective Xa, Xb, Xc, and Xd electrode groups including the switch electrodes X ₁ to Xn are applied before or after the application point of the scan pulses applied to the scan electrodes Y. Unlike FIG. 14A, an application time point of a data pulse applied to an address electrode of at least one address electrode group among the plurality of address electrode groups may be set later than an application time point of a scan pulse. same.

Referring to FIG. 14B, unlike in FIG. 14A, the driving waveform of the present invention scans an application time point of a data pulse applied to a plurality of address electrode groups Xa, Xb, Xc, and Xd including address electrodes X ₁ to Xn. The point of application of the scan pulse applied to the electrode Y is different, and the point of time of application of all the data pulses is later than the point of time of application of the aforementioned scan pulse. In FIG. 14B, the application time point of all data pulses applied to the address electrodes included in each address electrode group is set later than the application time point of the scan pulse. However, the address electrodes of only one address electrode group are among the plurality of address electrode groups. Only the application point of the data pulse to be applied may be set later than the application point of the scan pulse described above, and the number of address electrode groups to which the data pulse is applied later than the application point of the scan pulse may be changed. For example, as shown in FIG. 14B, the driving waveform according to the driving method of the present invention includes an address electrode including address electrodes X ₁ to Xn when it is assumed that an application point of the scan pulse applied to the scan electrode Y is ts. The data pulses are applied to the address electrodes included in the Xa electrode group according to the arrangement order of the group at a time point Δt later than the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts + Δt. Further, data pulses are applied to the address electrodes included in the Xb electrode group at a time point 2Δt later than the time point at which the scan pulse is applied to the scan electrode Y, that is, time point ts + 2Δt. In this manner, data pulses are applied to the address electrodes included in the Xc electrode group at the time point ts + 3Δt, and data pulses are applied to the Xd electrode at the time point ts + 4Δt. That is, as shown in FIG. 14B, the data pulses applied to the address electrode groups including the address electrodes X ₁ to Xn are applied after the application time of the scan pulses applied to the scan electrodes Y. FIG. Unlike FIG. 14B, an application time point of the data pulses applied to the address electrode groups including the address electrodes X ₁ to Xn is set differently from an application time point of the scan pulse applied to the scan electrode Y. The application time point may be set to be earlier than the application time point of the scan pulse, which is illustrated in FIG. 14C.

Referring to FIG. 14C, unlike in FIG. 14A or FIG. 14B, the driving waveforms of the present invention may be applied to the scan electrode Y when a data pulse applied to the address electrode groups including the address electrodes X ₁ to Xn is applied. The application point of the scan pulse is different from the application point of the scan pulse, and the application point of all the data pulses is earlier than the application point of the aforementioned scan pulse. In FIG. 14C, the application point of all the data pulses is set to be earlier than the application point of the scan pulse. However, only the application point of the data pulse applied to the address electrode included in one of the plurality of address electrode groups is scanned. The number of address electrode groups to which a data pulse is applied can be changed before the time of applying the pulse, and the data pulse is applied before the time of applying the scan pulse. For example, as shown in FIG. 14C, the driving waveform according to the driving method of the present invention includes an address electrode including address electrodes X ₁ to Xn when it is assumed that an application point of the scan pulse applied to the scan electrode Y is ts. According to the arrangement order of the group, the data pulse is applied to the address electrode included in the Xa electrode group at a time point Δt before the time when the scan pulse is applied to the scan electrode Y, that is, the time point ts-Δt. In addition, a data pulse is applied to an address electrode included in the Xb electrode group at a time point 2Δt before the time point at which the scan pulse is applied to the scan electrode Y, that is, at a time point ts-2Δt. In this way, a data pulse is applied at the time point ts-3Δt to the address electrode included in the Xc electrode group, and a data pulse is applied at the time point ts- (n-1) Δt to the address electrode included in the Xd electrode group. That is, as shown in FIG. 14C, the data pulses applied to the electrode groups including the address electrodes X ₁ to Xn are applied before the application time of the scan pulses applied to the scan electrodes Y. FIG.

Here, in FIGS. 14A to 14C, for example, an application time point of a scan pulse applied to the scan electrode Y is ts, and a time difference between application time points between the application pulse ts of the scan pulse and the closest data pulse is Δt, The difference between the application time point ts of the scan pulse and the next adjacent data pulse is 2Δt. This Δt remains constant. That is, in at least one address electrode group of the plurality of address electrode groups, an application time point of the data pulse applied to the address electrode is different from an application time point of the scan pulse applied to the scan electrode Y, and is applied to the plurality of address electrode groups. The difference between the application time points between the data pulses applied to the respective address electrodes X ₁ to Xn is equal to each other. Alternatively, the application time of the data pulse applied to the address electrode in at least one electrode group among the plurality of address electrode groups is different from that of the application of the scan pulse applied to the scan electrode Y, and according to the plurality of address electrode groups. The difference between the application time points between the data pulses applied to the respective address electrode groups may be different from each other. In other words, if the time difference between the application point ts of the scan pulses and the application point between the closest data pulses is Δt, the difference between the application point ts of the scan pulses and the next application data pulse may be 3Δt. For example, if the time when the scan pulse is applied to the scan electrode Y is 0 nanoseconds, the data pulse is applied to the address electrodes included in the Xa electrode group at the time of 10 nanoseconds (ns). Accordingly, the time difference between the application point of the scan pulse applied to the scan electrode Y and the application point of the data pulse applied to the Xa electrode group is 10 nanoseconds (ns). Next, data pulses are applied to the address electrodes included in the Xb electrode group, which is the address electrode group, at a time of 20 nanoseconds (ns), and are applied to the time point at which the scan pulse applied to the scan electrode Y is applied and the Xb electrode group. The time difference between the application time points of the data pulses applied is 20 nanoseconds (ns). Accordingly, the time difference between the application time point of the data pulses applied to the Xa electrode group and the application time point of the data pulses applied to the Xb electrode group is 10 nanoseconds (ns). to be. Subsequently, data pulses are applied to the address electrodes included in the Xc electrode group, which is the address electrode group, at a time of 40 nanoseconds (ns), and are applied to the time point at which the scan pulse applied to the aforementioned scan electrode Y is applied and to the Xc electrode group. The time difference between the application time of the data pulses applied is 40 nanoseconds (ns), and thus the time difference between the application time of the data pulses applied to the Xb electrode group and the application time of the data pulses applied to the Xc electrode group is 20 nanoseconds (ns). . That is, the difference between the application time of the scan pulse applied to the scan electrode Y and the application time of the data pulse applied to each address electrode group is different from each other. It can be set differently.

In this case, the difference in application time between the data pulses according to the plurality of address electrode groups described above is preferably set to 10 nanoseconds (ns) or more and 1000 nanoseconds (ns) or less in consideration of the time of the limited address period. Further, in view of the predetermined scan pulse width according to the driving of the plasma display device, it is preferable that Δt is set within a range of 1/100 to 1 times the predetermined scan pulse width.

Further, when the time of applying the scan pulse applied to the scan electrode Y is ts, regardless of the relationship between the time of application of the data pulses applied to the plurality of address electrode groups, the time of application of the scan pulse ts and its ts The difference between application points of the closest data pulses may be the same or different in each subfield. The difference between the application time of the scan pulse and the application time of the data pulse closest to the application time of the scan pulse is 10 nanoseconds (ns) or more and 1000 nanoseconds (ns) or less, considering the time of the limited address period as described above. Is preferably set to. Further, in view of the predetermined scan pulse width according to the driving of the plasma display panel, Δt is preferably set within a range of 1/100 to 1 times the total address period.

As described above, when the application point of the scan pulse applied to the scan electrode Y and the application point of the data pulse applied to each address electrode group are different in the address period, as shown in FIGS. 12A to 12B, the address electrodes X ₁ to Xn At each application time of the data pulses applied to each address electrode group including a coupling, the coupling through the capacitance of the panel is reduced to reduce noise of a waveform applied to the scan electrode and the sustain electrode. This stabilizes the address discharge occurring in the address period and suppresses the deterioration of the driving stability of the plasma display panel.

As a result, the address discharge is stabilized when the plasma display apparatus is driven, thereby making it possible to apply a single scan method in which the entire panel is scanned by one driving unit.

In addition to this, by controlling the length of the sustain period, the occurrence of high temperature false discharge is suppressed.

Meanwhile, only the time difference between the application point of the scan pulse applied to the scan electrode Y and the application point of the data pulse in one subfield when the application time of the scan pulse and the data pulse are different is described and described. . However, on the other hand, when the scan pulse is applied to the scan electrode Y based on one frame and the data pulses are applied to the address electrodes X ₁ to Xn or the address electrode groups Xa, Xb, Xc, and Xd, Different application time points may be set to different application time points between data pulses applied to the address electrodes for each subfield. Referring to such driving waveforms, a third embodiment of the method of driving the plasma display apparatus according to the present invention will be described. Same as

15 is a view showing an example in which the application time of the scan pulse and the application time of the data pulse are different from each other in the frame in the driving waveform according to the third embodiment of the driving method of the plasma display apparatus of the present invention. .

Here, in the third embodiment of the driving method of the present invention, as in the second embodiment, only the difference in the application timing of the scan pulse applied to the scan electrode and the data pulse applied to the address electrode in the address period is shown and described. . However, this third embodiment of the present invention is basically the same as the first or second embodiment described above, so that the third embodiment of the present invention has the same length of sustain period as the first or first embodiment. Adjusted to reduce the amount of space charge in the discharge cell. Since the adjustment of the length of the sustain period in this third embodiment is substantially the same as in the first embodiment or the second embodiment, overlapping description is omitted. In addition, the display in drawing is abbreviate | omitted.

In the driving method of the plasma display device according to the present invention, as shown in FIG. 13, the driving waveform according to the driving method of the plasma display device according to the present invention is applied to the address electrode X in the same subfield. The time difference between the application time points of the data pulses is all the same, and the application time point of the scan pulse applied to the scan electrode Y and the application time point of the data pulse applied to the address electrode X are different from each other. The time difference between application points between data pulses applied to the address electrode X in an address period in at least one subfield is the time difference between application points between data pulses applied to the address electrode in the address period in another subfield. Are different from each other.

In addition, the length of the sustain period is adjusted. As described above, by adjusting the length of the sustain period, the occurrence of high temperature misdischarge is suppressed as described above.

In addition, the timing of application of the scan pulse applied to the scan electrode Y and the application of the data pulse applied to the address electrodes X ₁ to Xn are different from each other, thereby preventing address discharge from becoming unstable and suppressing deterioration of driving stability. do. This increases the driving efficiency.

Here, as an example of a method of differentiating the application time of the data pulse and the scan pulse, the application time of the data pulse applied to the address electrodes X ₁ to Xn in the first subfield in one frame is determined by the scan electrode Y. While different from the application time point of the scan pulse applied to, the time difference between the application time points between the data pulses applied to the address electrodes is set to? T. In addition, in the second subfield, the address electrode is applied to the address electrodes X ₁ to Xn similarly to the first subfield, while the application time of the data pulse applied to the scan electrode Y is different from that of the scan pulse Y. The time difference between application points between data pulses applied to is set to 2Δt. In this manner, the time difference between the application time points between the data pulses applied to the address electrodes may be different for each subfield included in one frame, such as 3Δt, 4Δt, or the like.

Alternatively, in the driving waveform of the present invention, at least one subfield may set the application time of the data pulse differently before and after the application of the scan pulse, while the application time of the data pulse and the application time of the scan pulse are different from each other. have. For example, in the first subfield, the application point of the data pulse is set before and after the application of the scan pulse, and in the second subfield, the application point of the data pulse is set before the application point of the scan pulse. In the three subfields, the application point of the data pulse may be set after the application point of the scan pulse.

Looking at the driving waveform of the present invention in more detail by using the D, E, F region of Figure 15 as shown in Figure 16a to 16c.

16A through 16C are diagrams for describing the driving waveform of FIG. 15 in more detail.

First, referring to 16a, the driving waveform according to the driving method of the present invention is, for example, an address in the region D of FIG. 15 on the assumption that ts is the application time of the scan pulse applied to the scan electrode Y in the first subfield. In accordance with the arrangement order of the electrodes X ₁ to Xn, a data pulse is applied to the address electrode X ₁ at a point in time ts-2Δt, which is 2Δt earlier than the point in time when the scan pulse is applied to the scan electrode Y. In addition, a data pulse is applied to the address electrode X ₂ at a time point Δt ahead of the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts-Δt. In this way, a data pulse is applied at the time ts + Δt to the X (n-1) electrode and a data pulse is applied at the time ts + 2Δt to the Xn electrode. That is, as shown in FIG. 8A, the data pulses applied to the address electrodes X ₁ to Xn are applied before or after the application time of the scan pulses applied to the scan electrodes Y. FIG.

Referring to FIG. 16B, unlike in FIG. 16A, in the driving waveform of FIG. 15, in the region E of FIG. 15, the application time of the data pulse applied to the address electrodes X ₁ to Xn is applied to the scan electrode Y. The timing of application of all the data pulses is different from that of the time point, and later than the application of the aforementioned scan pulses. Here, in FIG. 16B, the application point of all data pulses is set later than the application point of the scan pulse. However, only the application point of one data pulse may be set later than the application point of the aforementioned scan pulse, and later than the application point of the scan pulse. The number of data pulses applied is changeable. For example, as shown in FIG. 16B, the driving waveform according to the driving method of the present invention is based on the arrangement order of the address electrodes X ₁ to Xn when it is assumed that the time of application of the scan pulse applied to the scan electrode Y is ts. The data pulse is applied to the address electrode X ₁ at a time point Δt later than the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts + Δt. In addition, a data pulse is applied to the address electrode X ₂ at a time point 2Δt later than the time point at which the scan pulse is applied to the scan electrode Y, that is, time point ts + 2Δt. In this way, a data pulse is applied to the X ₃ electrode at the time point ts + 3Δt and a data pulse is applied to the Xn electrode at the time point ts + (n-1) Δt.

Referring to FIG. 16C, unlike in FIG. 16A or 16B, the driving waveform of the present invention is a scan in which an application point of a data pulse applied to the address electrodes X ₁ to Xn is applied to the scan electrode Y in the region F of FIG. 15. The application point of the pulse is different from the application point of the pulse, and the application point of all data pulses is earlier than the application point of the aforementioned scan pulse. Here, in FIG. 16C, the application point of all the data pulses is set to be earlier than the application point of the scan pulse. However, only the application point of one data pulse may be set to be earlier than the application point of the scan pulse described above. The number of data pulses applied earlier is changeable. For example, as shown in FIG. 16C, the driving waveform according to the driving method of the present invention is based on the arrangement order of the address electrodes X ₁ to Xn when it is assumed that the time of application of the scan pulse applied to the scan electrode Y is ts. The data pulse is applied to the address electrode X ₁ at a time point Δt ahead of the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts-Δt. In addition, a data pulse is applied to the address electrode X ₂ at a time point 2Δt ahead of the time point at which the scan pulse is applied to the scan electrode Y, that is, the time point ts-2Δt. In this manner, a data pulse is applied to the X ₃ electrode at the time point ts-3Δt, and a data pulse is applied to the Xn electrode at the time point ts- (n-1) Δt. That is, as illustrated in FIG. 11D, the data pulses applied to the address electrodes X ₁ to Xn are applied before the time point at which the scan pulses applied to the scan electrodes Y are applied.

16A is the same as the driving waveform of FIG. 11A, FIG. 16B, FIG. 11B, and FIG. 16C. Therefore, redundant descriptions will be omitted.

Thus, if differently the application time points of data pulses applied to the application time point and the address electrode (X ₁ ~ Xn) of a scan pulse applied to the scan electrode (Y) during the address period of each sub-field, the address electrodes (X ₁ ~ Xn At each time of application of the data pulses applied to the N-axis, coupling of the panel through the capacitance is reduced to reduce noise of the waveforms applied to the scan electrode and the sustain electrode. This stabilizes the address discharge occurring in the address period and suppresses the deterioration of the driving stability of the plasma display panel.

As a result, by stabilizing the address discharge of the plasma display panel, a single scan method for scanning the entire panel with one driving unit can be applied.

In addition, by adjusting the length of the sustain period, the occurrence of erroneous discharge according to the temperature of the plasma display panel is suppressed.

As described above, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. For example, in the above description, four electrodes are applied to all the address electrodes X ₁ to Xn at different times from when the scan pulse is applied, or four electrodes having the same number of address electrodes in the arrangement order of all the address electrodes. Although only the method of dividing into groups and applying a data pulse at a different time from when the scan pulse is applied to each electrode group is illustrated and described, the odd-numbered address electrodes among all the address electrodes X ₁ to Xn are different from each other. Set the electrode group, set the even-numbered address electrodes to the other electrode group, apply data pulses to all address electrodes in the same electrode group at the same time point, and apply scan pulses at the time of applying the data pulses of the respective electrode groups. It is also possible to set it differently from the point in time.

In addition, at least one of the plurality of electrode groups having different numbers of address electrodes may be used to classify the address electrodes X ₁ to X n so that the data pulses are applied at different time points from when the scan pulses are applied to each electrode group. You can also do it. For example, assuming that the time point of applying the scan pulse applied to the scan electrode Y is ts, a data pulse is applied to the address X ₁ electrode at the time point ts + Δt and ts + to the address electrodes X ₂ to X ₁₀ electrodes. The driving method of the plasma display panel according to the present invention can be variously modified by applying a data pulse at 3Δt and applying a data pulse at ts + 4Δt to the address electrodes X ₁₁ to Xn electrodes.

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 application time of the data pulse applied to the address electrode in the address period to reduce the noise of the waveform applied to the scan electrode and the sustain electrode to stabilize the address discharge, thereby driving the panel. It is effective in suppressing the deterioration of the driving stability by controlling the stability, adjusting the period from the time of the last sustain discharge to the reset period of the next subfield, and suppressing the occurrence of erroneous discharge according to temperature.

Claims (42)

A plasma display panel including a scan electrode and a sustain electrode, and an address electrode intersecting the scan electrode and the sustain electrode; A driving unit for driving the electrodes; And In the address period of at least one of the subfields of the frame by controlling the driving unit, an application time point of a data pulse applied to at least one address electrode group among a plurality of address electrode groups including at least one address electrode is And a driving pulse controller which is different from a time point at which a scan pulse is applied to the scan electrode and which length of a sustain period in which a sustain pulse is applied to the scan electrode or the sustain electrode is adjusted. The adjustment of the length of the sustain period adjusts the period from the time point at which the last sustain pulse is applied to the reset period of the next subfield in the sustain period, And a period from the time point at which the last sustain pulse is supplied to the reset period of the next subfield in the sustain period is 100 mW or more and 1 mW or less. The method of claim 1, The driving pulse controller And an application point of the data pulse applied to the at least one address electrode group in the address period is earlier than an application point of the scan pulse applied to the scan electrode. The method of claim 2, The driving pulse controller And the application point of the data pulses applied to all the address electrode groups in the address period is earlier than the application point of the scan pulses applied to the scan electrodes. The method of claim 1, The driving pulse controller And the application point of the data pulse applied to the at least one address electrode group in the address period is later than the application point of the scan pulse applied to the scan electrode. The method of claim 4, wherein The driving pulse controller And the application point of the data pulses applied to all the address electrode groups in the address period is later than the application point of the scan pulses applied to the scan electrodes. The method of claim 1, And the number of the address electrode groups is two or more and less than the total number of the address electrodes. The method of claim 1, And the address electrode group includes one or more of the address electrodes. The method of claim 1, And the address electrode group includes the same number of address electrodes or one or more different number of address electrodes. The method of claim 1, The driving pulse controller And applying the data pulse to all address electrodes included in one address electrode group at the same time point. The method of claim 1, The driving pulse controller And the difference between the application point of the scan pulse and the application point of the data pulse closest to the application point of the scan pulse in the subfield is the same or different. The method of claim 10, The driving pulse controller And a difference between the application time of the scan pulse and the application time of the data pulse closest to the application time of the scan pulse in the subfield is 10 ns or more and 1000 ns or less. The method of claim 10, The driving pulse controller The difference between the application time of the scan pulse and the application time of the data pulse closest to the application time of the scan pulse in the subfield may have a value of 1/100 times or more times 1 times or less of a predetermined scan pulse width. Plasma display device. The method of claim 1, The driving pulse controller And the difference between the application time points of the two data pulses applied to two or more different address electrode groups at different time points is the same or different. The method of claim 13, The driving pulse controller And a difference in application time between two data pulses applied to two different address electrode groups at different time points is 10 ns or more and 1000 ns or less. The method of claim 13, The driving pulse controller And a difference in application time between two data pulses applied at different time points to two or more different address electrode groups has a value of 1/100 times or more than 1 time of a predetermined scan pulse width. delete delete delete The method of claim 1, The period from the end of the supply of the last sustain pulse to the reset period of the next subfield in the sustain period is And a last sustain pulse applied in the sustain period maintains a ground level (GND). The method of claim 1, And a supply period of the last sustain pulse supplied in the sustain period is 1 ms or more and 1 ms or less. The method of claim 20, The supply period of the last sustain pulse supplied in the sustain period is And a last sustain pulse applied in the sustain period is a period in which the sustain voltage (Vs) is maintained. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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