KR100811551B1 - 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 device, and more particularly, to a plasma display device and a driving method thereof, by adjusting a voltage of a positive waveform applied to a sustain electrode to improve discharge accuracy and improve jitter characteristics.

The plasma display apparatus according to the present invention includes a plasma display panel including a plurality of scan electrodes and a plurality of sustain electrodes, and a plurality of scan electrodes are sequentially delayed in time than first scan pulses and the first scan pulses. The sustain time of the controller controls the scan driver to apply a longer second scan pulse during the address period and the sustain driver to drive the plurality of sustain electrodes, so that any one of the set-down period and the address period or the address period of the subfield of the frame is controlled. The voltage of the positive waveform applied to the sustain electrode during the period is varied with a predetermined slope from the first voltage level to the second voltage level, and the voltage of the positive waveform is adjusted to the average picture level (APL). And a driving pulse controller to be adjusted accordingly.

Description

Plasma Display Apparatus and Driving Method Thereof

1 is a schematic diagram of a conventional plasma display device structure.

Fig. 2 shows the jitter characteristic of the conventional address discharge.

3 is a diagram showing the structure of a plasma display device of the present invention;

4 is a view showing an example of the structure of a panel in the plasma display device of the present invention.

5 is a diagram illustrating a method of implementing image gradation of the plasma display device of the present invention.

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

Fig. 7 shows an embodiment of the plasma display device of the present invention.

8A-8B illustrate an embodiment of a drive waveform according to the first embodiment of FIG. 7.

9A-9B illustrate another embodiment of a drive waveform according to the first embodiment of FIG. 7.

FIG. 10 is a view showing that the maintenance time of the scan pulse is changed in FIGS. 9A to 9B.

11 is a diagram for explaining an average picture level (APL).

FIG. 12 is a diagram illustrating adjusting one embodiment of FIG. 7 according to a subfield of a frame; FIG. Temperature not drawing

FIG. 13 is a view showing adjustment of one embodiment of FIG. 7 for each sustain electrode group. FIG.

Fig. 14 shows two embodiments of the plasma display device of the present invention.

15A-15B illustrate an embodiment of a drive waveform according to the second embodiment of FIG. 14.

16A-16B illustrate another embodiment of a drive waveform according to the second embodiment of FIG. 14.

FIG. 17 is a view illustrating a different sustain time of a scan pulse in FIGS. 16A to 16B.

FIG. 18 illustrates adjusting the second embodiment of FIG. 14 according to a subfield of a frame; FIG.

FIG. 19 is a view showing adjusting the second embodiment of FIG. 14 for each sustain electrode group. FIG.

Fig. 20 is a diagram showing the jitter characteristic of the address discharge of the present invention.

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

700: sustain driver 710: sustain voltage applying unit

720: base voltage application unit 730: energy recovery circuit unit

740: drive pulse control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device for controlling a voltage of a positive waveform applied to a sustain electrode and a driving method thereof.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form a unit discharge cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He). An inert gas containing a main discharge gas such as and a small amount of xenon is filled. 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 is a schematic diagram of a conventional plasma display device structure.

As shown in FIG. 1, the plasma display panel 100 includes respective electrodes, that is, the data electrode X, the sustain electrode Z, and the scan electrode Y, for example. In addition, the driving units for driving the electrodes include, for example, a data driver 101 for driving the data electrode X, a sustain driver 103 for driving the sustain electrode Z, and a scan electrode Y. The scan driver 102 is attached to form a plasma display device.

By the voltages applied by these drivers, the gases in the discharge cells generate a predetermined number of discharges to drive the plasma display apparatus. Such discharges include, for example, a reset discharge for initializing each cell, an address discharge for selecting a cell to be discharged, a sustain discharge for maintaining a discharge of the selected cell, and an erase discharge for erasing wall charge in the discharged cell. As an example, the delay characteristic of the address discharge is illustrated in FIG. 2 as follows.

2 is a diagram illustrating jitter characteristics of a conventional address discharge.

As shown in FIG. 2, as an example of the discharge of the conventional plasma display panel, the scan electrode Y and the data electrode X shown in FIG. 1 are used to select a discharge cell in which an image is to be displayed, that is, a discharge cell in which display discharge will occur. Address discharge is performed in the address period. FIG. 2 shows an optical waveform that appears in accordance with the pulses applied to each discharge cell to cause such an address discharge.

In FIG. 2, as an example, the time duration of the optical wave form of 500 consecutive address discharges is shown. That is, when driving the conventional plasma display panel, the time from the time when the first pulse for address discharge starts to be applied to the discharge cells sequentially generates address discharge for each discharge cell and the time when the last address discharge occurs is approximately 2.5 ms. It can be seen that the discharge is delayed due to the time difference between the time of application and the time of occurrence of the optical waveform. The jitter characteristic, which is the discharge delay characteristic, may appear for various reasons.

For example, the difference in the wall charges generated between the electrodes or various causes of mis-discharge, for example, a problem in which the jitter characteristic is further deteriorated due to a weak burst of discharge between the electrodes or inaccuracy of the discharge between the electrodes.

In particular, the difference in wall charges described above is further exacerbated at high temperatures. In other words, the recombination ratio on the wall charge and the discharge space increases at a high temperature. As a result, the wall charge is lost and thus the problem of mis-discharge is further exacerbated. As a result, even a discharge cell to be turned on is turned off, and thus there is a problem that no image is displayed.

In order to solve this problem, an object of the present invention is to provide a plasma display device and a driving method thereof for preventing the loss of wall charges.

In addition, another object of the present invention is to provide a plasma display device and a driving method thereof capable of controlling the state of wall charges as desired.

In addition, another object of the present invention is to provide a plasma display device and a driving method thereof having improved discharge accuracy.

Further, another object of the present invention is to provide a plasma display device and a driving method thereof having improved jitter characteristics.

In addition, another object of the present invention is to provide a plasma display device and an driving method thereof having improved address margin.

In addition, another object of the present invention is to provide a plasma display device and a driving method thereof that can operate accurately even at a high temperature.

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

A plasma display apparatus of the present invention for achieving the above object is a plasma display panel including a plurality of scan electrodes and a plurality of sustain electrodes, the first scan pulse and the first scan pulse in the plurality of scan electrodes in order in time The delay time of the scan pulse is controlled by controlling the scan driver for applying the longer second scan pulse during the address period and the sustain driver for driving the plurality of sustain electrodes, so that the set-down period and the address period or address of the subfield of the frame are controlled. The voltage of the positive waveform applied to the sustain electrode during any one of the periods is varied with a predetermined slope from the first voltage level to the second voltage level, and the voltage of the positive waveform is the average picture level (APL: Average Picture). Including driving pulse controller to adjust according to level .

The sustain driver may include a sustain voltage applying unit for applying a voltage of the positive waveform to the sustain electrode and a base voltage applying unit for applying a base voltage to the sustain electrode.

The sustain voltage applying unit may include a first voltage source for supplying the voltage of the positive waveform to the sustain electrode and a first switch for controlling the supply of voltage of the positive waveform, and the ground voltage applying unit is the sustain electrode. A second voltage source for supplying the base voltage and a second switch for controlling the supply of the base voltage, wherein the first voltage source is commonly connected to one end of the first switch and one end of the driving pulse controller. The second voltage source may be connected to the other end of the second switch, and one end of the second switch may be commonly connected to the other end of the driving pulse controller, the other end of the first switch, and the sustain electrode.

The first voltage source may be a voltage source commonly used to supply the voltage of the positive waveform and the sustain voltage applied to the sustain electrode during the sustain period of the subfield of the frame.

In addition, an energy recovery circuit unit for recovering reactive power of the plasma display panel may be further connected to the other end of the first switch, the other end of the driving pulse controller, and one end of the second switch.

In addition, when the voltage of the positive waveform applied to the sustain electrode is changed from the first voltage level to the second voltage level, it is characterized in that it has a predetermined slope.

In addition, the first voltage level is characterized in that the ground level (GND).

In addition, the second voltage level is characterized in that the sustain voltage level (GND).

The voltage of the positive waveform applied to the sustain electrode during the set down period, the address period, or the address period may be adjusted according to an average picture level (APL).

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In addition, the sustain driver may be configured such that the voltage of the positive waveform applied to the sustain electrode is different from other subfields during the set-down period of one or more subfields of the plurality of subfields of the frame and any one of an address period or an address period. Characterized in that.

In addition, the sustain driving unit has a voltage of a positive waveform applied to the sustain electrode during one of a set-down period and an address period or an address period of a subfield of the frame above a threshold temperature, at a second voltage level at a first voltage level. To be variable with a predetermined slope.

The sustain electrode may be divided into a plurality of electrode groups, and the voltage of the positive waveform applied to each electrode group may be adjusted differently.

In addition, a plasma display apparatus of the present invention for achieving the above object is a plasma display panel including a plurality of scan electrodes and a plurality of sustain electrodes, the first scan pulse and the first scan pulse to the plurality of scan electrodes in time The order is slow, and the scan pulse holding time controls the scan driver for applying the longer second scan pulse for the address period, and the sustain driver for driving the plurality of sustain electrodes, so that the set-down period and the address of the subfield of the frame are controlled. During the period or the address period, the voltage of the positive waveform applied to the sustain electrode causes three or more voltage levels to be varied in sequential order, and the voltage of the positive waveform is the average picture level (APL). It includes a drive pulse control unit to be adjusted according to).

The driving pulse controller may be configured to vary the voltage of the positive waveform with a predetermined slope in one or more of the sections in which the magnitudes of the positive waveforms vary in sequential order.

The sustain driver may include a sustain voltage applying unit for applying a voltage to the sustain electrode and a base voltage applying unit for applying a base voltage to the sustain electrode.

The sustain voltage applying unit may include a first voltage source for supplying a sustain voltage applied to the sustain electrode, a first switch for controlling the supply of the sustain voltage, and a second voltage source for supplying a voltage of the positive waveform; The voltage applying unit includes a third voltage source for supplying the base voltage to the sustain electrode and a second switch for controlling the supply of the base voltage, wherein the first voltage source is connected to one end of the first switch, and the first switch The other end of the switch is commonly connected to one end of the second switch, the other end of the driving pulse control unit and the sustain electrode, the second voltage source is connected to one end of the driving pulse control unit, and the third voltage source is connected to the second switch. It is characterized in that connected to the other end of.

In addition, the second voltage source is characterized in that it comprises a plurality of voltage sources for applying a voltage of a different size.

The driving pulse controller may be configured such that when the voltage of the positive waveform is at the sustain voltage level, one end thereof is commonly connected to the first voltage source so that the first voltage source supplies the voltage of the positive waveform. .

In addition, an energy recovery circuit unit for recovering reactive power of the plasma display panel may be further connected to the other end of the first switch, the other end of the driving pulse controller, and one end of the second switch.

In addition, it is characterized in that the resistance is such that the voltage of the positive waveform applied to the sustain electrode has a predetermined slope in a section where the magnitude thereof is sequentially changed at the three or more voltage levels.

The driving pulse controller may be configured such that the voltage of the positive waveform applied to the sustain electrode during one of the setdown period and the address period or the address period of the subfield of the frame is sequential at the three or more voltage levels. It is characterized by increasing in order.

The driving pulse controller may be configured such that the voltage of the positive waveform applied to the sustain electrode during one of the setdown period and the address period or the address period of the subfield of the frame is sequential at the three or more voltage levels. It is characterized by decreasing in order.

In addition, the sustain driver may be configured such that the voltage of the positive waveform applied to the sustain electrode is different from other subfields during the set-down period of one or more subfields of the plurality of subfields of the frame and any one of an address period or an address period. Characterized in that.

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The sustain driver may include a voltage of a positive waveform applied to the sustain electrode during a set down period and an address period or an address period of a subfield of the frame above a threshold temperature, in order of three or more voltage levels. Characterized in that it is variable.

The sustain electrode may be divided into a plurality of electrode groups, and the voltage of the positive waveform applied to each electrode group may be adjusted differently.

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

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

As shown in FIG. 3, the plasma display apparatus of the present invention includes scan electrodes Y1 to Yn and a sustain electrode Z, and a plurality of data electrodes X1 to Xm intersecting the scan electrode and the sustain electrode Z. ).

In addition, a plasma display panel 300 and a plasma display panel in which a driving pulse is applied to the data electrodes X1 to Xm, the scan electrodes Y1 to Yn, and the sustain electrode Z in the reset period, the address period and the sustain period. A data driver 302 for supplying data to the data electrodes X1 to Xm formed in the 300, a scan driver 303 for driving the scan electrodes Y1 to Yn, and sustain electrodes as common electrodes. A sustain driver 304 for driving (Z), and a drive voltage generator 301 for supplying driving voltages necessary for the respective driving units 302, 303, and 304.

As described above, the plasma display device of the present invention expresses an image made of a frame by a combination of a plurality of subfields to which driving pulses are applied to the data electrode, the scan electrode and the sustain electrode in the reset period, the address period and the sustain period. In addition, the frame is divided into a plurality of subfield groups, and each of the driving units 302, 303, and 304 is controlled in the plurality of subfield groups, so that any one of a setdown period and an address period or an address period of one or more subfields of the frame is controlled. Adjust the voltage of the positive waveform applied to the sustain electrode for one period. The detailed configuration and reason for adjusting the voltage of the positive waveform in this way will be made clear in the following description.

Here, the above-described plasma display panel 300 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals, a plurality of electrodes, for example, scan electrodes (Y1 to Yn) and sustain The electrodes Z are formed in pairs, and the data electrodes X1 to Xm are formed to intersect the scan electrodes Y1 to Yn and the sustain electrode Z.

The data driver 302 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 302 samples and latches data in response to a data timing control signal CTRX from a timing controller (not shown), and supplies the data to the data electrodes X1 to Xm. .

The scan driver 303 supplies the rising ramp waveform Ramp-up and the falling ramp waveform Ramp-down to the scan electrodes Y1 to Yn during the reset period. In addition, the scan driver 303 sequentially supplies scan pulses of the scan voltage (−Vy) to the scan electrodes Y1 to Yn during the address period, and supplies sustain pulses Vs to the scan electrodes Y1 to the sustain period during the sustain period. Yn).

The sustain driver 304 sustains the positive voltages for one or more of a period from a ramp ramp down to an address period or an address period under the control of a timing controller (not shown). ), Which will be described in detail later with reference to FIG. 7.

In addition, the sustain driver 304 alternately operates with the scan driver 303 during the sustain period to supply the sustain pulse Vs to the sustain electrodes Z.

The data control signal CTRX described above includes a sampling clock for sampling data, a latch control signal, a switch control signal for controlling on / off time of the energy recovery circuit and the driving switch element. The scan control signal CTRY includes an energy recovery circuit in the scan driver 303 and a switch control signal for controlling on / off time of the driving switch element. The sustain control signal CTRZ includes energy in the sustain driver 304. A switch control signal for controlling the on / off time of the recovery circuit and the drive switch element is included.

The driving voltage generator 301 generates a setup voltage Vsetup, a scan common voltage Vscan-com, a 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.

In addition, the data driver 302, the scan driver 303, and the sustain driver 304 may be connected to the data electrodes X1-Xm of the plasma display panel 300 through a connector such as a flexible printed circuit (FPC) (not shown). And scan electrodes Y1 to Yn and sustain electrodes Z, respectively.

Herein, an example of the structure of the plasma display panel 300 described above will be described with reference to FIG. 4 in order to clarify the configuration of the plasma display apparatus of the present invention.

4 is a view showing an example of the structure of a panel in the plasma display device of the present invention.

As shown in FIG. 4, in the plasma display panel of the present invention, a plurality of scan electrodes 402 and Y and sustain electrodes 403 and Z are formed in pairs on the front substrate 401 which is an image display surface. The rear panel 410 in which the plurality of data electrodes 413 and X are arranged so as to intersect the plurality of storage electrode pairs described above on the front panel 400 having the storage electrode pairs arranged thereon and the rear substrate 411 forming the rear surface thereof. Combined in parallel with a certain distance between them.

The front panel 400 is, for example, the scan electrodes 402 and Y and the sustain electrodes 403 and Z for mutually discharging and maintaining light emission from one discharge cell, that is, a transparent electrode formed of a transparent ITO material. And a pair of scan electrodes 402 and Y and sustain electrodes 403 and Z provided as a bus electrode b made of a metal material. Scan electrodes 402 and Y and sustain electrodes 403 and Z are covered by one or more top dielectric layers 404 that limit the discharge current and insulate the electrode pairs, and discharge on top of top dielectric layer 404. In order to facilitate the condition, a protective layer 405 on which magnesium oxide (MgO) is deposited is formed.

For example, the rear panel 410 is arranged such that a plurality of discharge spaces, that is, barrier ribs 412 of a stripe type (or well type) for forming discharge cells are arranged in parallel. In addition, a plurality of data electrodes 413 and X for performing address discharge to generate vacuum ultraviolet rays are disposed in parallel with the partition wall 412. On the upper side of the rear panel 410, R, G, and B phosphors 414 which emit visible light for image display during address discharge are coated. A lower dielectric layer 415 is formed between the data electrodes 413 and X and the phosphor 414 to protect the data electrodes 413 and X.

In FIG. 4, only an example of the structure of the plasma display panel of the present invention is shown and described, and the present invention is not limited to the structure of FIG. 4. For example, in FIG. 4, only the scan electrodes 402 and Y and the sustain electrodes 403 and Z are formed on the front panel 400, and the data electrodes 413 and X are formed on the rear panel 410. 2, scan electrodes 402 and Y, sustain electrodes 403 and Z, and data electrodes 413 and X may be formed on the front panel 400.

In addition, although the above-described scan electrodes 402 and Y and the sustain electrodes 403 and Z respectively show only the transparent electrode a and the bus electrode b, the scan electrodes 402 and Y are different from the scan electrodes 402 and Y, respectively. At least one of the sustain electrodes 403 and Z may be made of only the bus electrode b.

The front panel 400 and the rear panel 410 thus formed are bonded to each other through a sealing process to form a plasma display panel, and the above-described electrodes, for example, the scan electrodes 402 and Y, the sustain electrodes 403 and Z, and the data are formed. A driving unit and the like for driving the electrodes 413 and X are attached to form a plasma display device.

Meanwhile, a method of representing an image by the plasma display device of the present invention will be described with reference to FIG. 5.

5 is a diagram illustrating a method of implementing image gradation of the plasma display apparatus of the present invention.

As shown in FIG. 5, in the method of expressing a gray level of the plasma display apparatus of the present invention, one frame is divided into several subfields each of which has a predetermined number of emission times, and each subfield again divides all cells. It is divided into a reset period (RPD) for initializing, an address period (APD) for selecting a cell to be discharged, and a sustain period (SPD) for implementing gray scale according to the number of discharges.

For example, when displaying an image with 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. 5, and eight subfields. Each of the SFs SF1 to SF8 is divided into a reset period, an address period, and a sustain period.

The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting the cell to be discharged is caused by the voltage difference between the data 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, an image is displayed using the difference in the sustain period in each subfield. That is, the gray scale of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges.

In FIG. 5, only one frame is composed of eight subfields. However, the number of subfields forming one frame may be changed in various ways. For example, one frame may be configured with 12 subfields from the first subfield to the twelfth subfield, or one frame may be configured with 10 subfields.

Also, in FIG. 5, subfields are arranged in the order of increasing magnitude of gray scale weight in one frame. Alternatively, subfields may be arranged in order of decreasing gray scale weight in one frame, or gray scale. Subfields may be arranged regardless of the weight.

The driving waveform according to the driving method of the plasma display panel according to the present invention, which implements the gray scale of the image in this manner, is as follows.

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

As shown in FIG. 6, the plasma display apparatus divides a frame of a screen into a plurality of subfields, for example, a reset period for initializing all the subfields, an address period for selecting cells to be discharged, The driving is divided into a sustain period for maintaining the discharge of the selected cell. In addition, an erasing period for erasing wall charges in the discharged cell may be added and driven as necessary.

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

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

In the address period, the negative scan pulses are sequentially applied to the scan electrodes, and the positive data pulses are applied to the data electrodes 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.

Here, the sustain electrode is supplied with the voltage Vz of the positive waveform as shown in the region A of FIG. 6 so that the voltage difference with the scan electrode is reduced from the set down period to the address period or during the address period so as to prevent erroneous discharge from the scan electrode. One example of the plasma display device of the present invention, which is different from the conventional method, is that the voltage of the positive waveform includes a first voltage level and a second voltage level, and varies with a predetermined slope from the first voltage level to the second voltage level. . Detailed configuration thereof will be described later with reference to FIG. 7.

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

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

Hereinafter, a characteristic sustain driver of the present invention will be described in detail with reference to the accompanying drawings.

7 is a diagram showing an embodiment of a plasma display device of the present invention.

As shown in FIG. 7, the plasma display apparatus of the present invention includes a sustain driver 700 and a driving pulse controller 740 for driving the sustain electrode.

The sustain driver 700 includes a sustain voltage applying unit 710 for applying a positive waveform voltage to the sustain electrode Z, and a base voltage applying unit 720 for applying a base voltage to the sustain electrode Z.

The sustain voltage applying unit 710 includes a first voltage source V1 for supplying the voltage of the positive waveform to the sustain electrode Z and a first switch Q1 for controlling the voltage supply of the positive waveform.

The base voltage applying unit 720 includes a second voltage source V2 for supplying the base voltage to the sustain electrode Z and a second switch Q2 for controlling the supply of the base voltage.

The first voltage source V1 described above is commonly connected to one end of the first switch Q1 and one end of the driving pulse controller 740, and the second voltage source V2 is connected to the other end of the second switch Q2. One end of the second switch Q2 is commonly connected to the other end of the driving pulse controller 740, the other end of the first switch Q1, and the sustain electrode Z. The sustain electrode Z is connected to the panel Cp so that driving voltages are applied to the panel through the sustain electrode Z.

Further, an energy recovery circuit unit 730 for recovering reactive power of the plasma display panel Cp is further provided at the other end of the first switch Q1, the other end of the driving pulse controller 740, and one end of the second switch Q2. The common connection minimizes the reactive power of the panel, reducing power consumption.

In this case, the driving pulse controller 740 described above has the first voltage level and the second voltage of the positive waveform applied to the sustain electrode Z during the set down period and the address period or the address period of the subfield of the frame. And a voltage level, and varying with a predetermined slope from the first voltage level to the second voltage level.

More specifically, when the level of the voltage of the positive waveform applied from the driving pulse controller 740 to the sustain electrode Z is varied from the first voltage level to the second voltage level, the variable voltage may be varied with a predetermined slope. (VR1), which is a variable resistor or a fixed resistor that can be varied to form a voltage gradient that matches the characteristics of the panel, that is, the length of the address period or the wall charge distribution. It features.

Further, when there is a level equal to the voltage level Vs of the sustain pulse applied to the sustain electrode in the sustain period among the voltage levels described above, that is, the voltage of the positive waveform described above, for example, the first voltage source shown in FIG. If V1 supplies the voltage level Vs of the sustain pulse, the driving device can be simplified by integrating the voltage source to which the sustain pulse is applied and the voltage source of the positive waveform into the first voltage source V1.

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

8A through 8B are diagrams illustrating exemplary driving waveforms according to the exemplary embodiment of FIG. 7.

As shown in Figs. 8A to 8B, during the set down period and the address period or the address period of the subfield (both the set down period and the address period are shown in Figs. 8A to 8B), only the address period is different. The voltage of the positive waveform may be applied.) The voltage of the positive waveform applied to the sustain electrode Z includes a first voltage level and a second voltage level, and from the first voltage level to the second voltage level. It is allowed to vary with a predetermined slope. More specifically, when the first voltage level is set to the ground (GND) level and the second voltage level is set to the sustain voltage level (Vs), a waveform as shown in FIG. 8A may appear. That is, when the voltage of the positive waveform is varied from the ground level GND to the sustain voltage level Vs, the voltage is increased by a predetermined slope.

In addition, as shown in FIG. 8B, the voltage of the positive waveform rises with a predetermined slope at the first voltage level, for example, the ground level GND, and then is changed to the second voltage level, for example, the sustain voltage level Vs, for a second period of time. Voltage level can be maintained.

The reason for adjusting the voltage of the positive waveform applied to the sustain electrode is to prevent the loss of wall charge. That is, by applying a voltage having a slope, it is possible to gradually accumulate wall charges to prevent the loss of wall charges. By thus preventing erroneous discharge, the accuracy of discharge of the plasma display device can be improved.

In particular, when the plasma display device is driven, the rate of recombination of the wall charges and the space charges in the discharge cells increases in a high temperature or high temperature environment, and the wall charges are likely to disappear. Thus, by setting the critical temperature of the high temperature, the voltage of the positive waveform of the present invention can be adjusted as described above when the critical temperature is higher. That is, the voltage of the positive waveform applied to the sustain electrode during the set down period and the address period or the address period of the subfield of the frame above the threshold temperature has a predetermined slope from the first voltage level to the second voltage level. By varying, high temperature discharge can be prevented.

In this way, by preventing erroneous discharge and preventing loss of wall charges, there is an effect of increasing the accuracy of the discharge and improving the jitter characteristic of delaying the address discharge for selecting the discharge cells to be turned on in the above-described address period.

Such an embodiment of the plasma display device of FIG. 7 is not limited thereto, and the driving waveform shown in FIG. 9 may also be implemented.

9A to 9B are diagrams illustrating another exemplary driving waveform according to the exemplary embodiment of FIG. 7.

As shown in Figs. 9A to 9B, during one of the set down and address periods or the address periods of the subfield (both the set down period and the address period are shown in Figs. 9A to 9B), only the address period is positive. The voltage of the waveform may be applied.) The voltage of the positive waveform applied to the sustain electrode Z is varied with a predetermined slope from the first voltage level to the second voltage level. More specifically, when the first voltage level is set to the sustain voltage level Vs and the second voltage level is set to the ground GND level, a waveform as shown in FIG. 9A may appear. That is, when the voltage of the positive waveform is varied from the sustain voltage level Vs to the ground level GND, the voltage is reduced by a predetermined slope.

In addition, as shown in FIG. 9B, the voltage of the positive waveform maintains the first voltage level, for example, the sustain voltage level Vs for a period of time, and then falls with a predetermined slope to be changed to the second voltage level, for example, the ground level GND. Can be. 9A and 9B, the widths of the scan pulses sequentially applied to the scan electrodes may also be adjusted as the voltage levels of the positive waveforms are gradually lowered. same.

FIG. 10 is a diagram illustrating a different maintenance time period of a scan pulse in FIGS. 9A to 9B.

As shown in FIG. 10, the voltage of the positive waveform applied to the sustain electrode Z is varied to have a predetermined slope from the first voltage level to the second voltage level, where the first voltage level is the second voltage level. When it has a higher level, the waveform of the negative slope from which the voltage of a positive waveform falls is formed.

While the voltage of the positive waveform having the negative slope is supplied, scan pulses (-Vy) for selecting discharge cells are sequentially applied to the plurality of scan electrodes Y1 to Yn. The longer the pulse, the longer the duration of the pulse. That is, as the voltage of the positive waveform falls, the sustain period of the scan pulse becomes longer (t1, ... t2, t3, t4), thereby minimizing the possibility of loss of wall charge.

In addition, a scan electrode group obtained by dividing a plurality of scan electrodes according to a scanning order may be formed, and scan pulse holding intervals for each scan electrode group may be set differently, and may be implemented in various forms. As such, the maintenance time of the scan pulse can be adjusted differently for each scan electrode, thereby improving high-speed driving and address margin.

In addition, the voltage of the positive waveform in the plasma display device of the present invention may be adjusted according to an average picture level (APL), which will be described with reference to FIG. 11.

11 is a diagram for describing an average picture level (APL).

As illustrated in FIG. 11, there is a graph of an average image level APL determined according to the number of discharge cells that are turned on among discharge cells of the plasma display panel. As the average image level APL increases, the number of sustain pulses allocated per unit gray scale decreases. In other words, as the average image level APL increases, the number of sustain pulses decreases. As the average image level APL decreases, the number of sustain pulses increases.

For example, when an image is displayed on a portion of a relatively large area on the screen of the plasma display panel, power consumption is greatly increased. When the area where the image is displayed is relatively large (in this case, the APL level is relatively large), the number of discharge cells contributing to the image display is relatively large. By reducing the number of sustain pulses per unit gray level relatively, the total amount of power consumption of the plasma display panel is reduced.

On the contrary, when the image is displayed only on a relatively small area on the screen of the plasma display panel, power consumption is greatly reduced. When the area where the image is displayed is relatively small (in this case, the APL level is relatively small), the number of discharge cells contributing to the image display is relatively small, so that the discharge cells are supplied to each discharge cell contributing to the image display. The number of sustain pulses per unit gray level becomes relatively large. As a result, the luminance of the portion where the image is displayed can be increased. As described above, the driving method considering the average image level APL not only improves the overall image quality by increasing the peak luminance, which is a weak point of the plasma display panel, but also prevents a sudden increase in the total power consumption of the plasma display panel. .

Here, the plasma display device of the present invention can adjust the voltage of the above-described positive waveform according to the average image level APL. That is, as described above, for example, when the average image level APL is relatively high, the number of discharge cells that are turned on on the plasma display panel is relatively large, so that the sustain pulses allocated per unit gray scale decrease, so that the accuracy of discharge is reduced. In order to prevent deterioration of the present invention, one embodiment of the present invention of FIGS. 7 to 10 described above may be applied. That is, for example, one embodiment of the present invention can be applied above the threshold level by setting the threshold level among the average image levels APL.

In this way, when the average image level APL is high, according to the embodiment of the present invention, even if the number of sustain pulses is reduced, there is an effect of preventing mis-discharge. In other words, by ensuring the address discharge in the address period, it is possible to accurately maintain the state of the wall charge in the address period before the sustain discharge occurs so that the sustain discharge can occur smoothly even if the number of the sustain pulses is reduced.

In addition, the voltage of the positive waveform in the plasma display apparatus of the present invention may be adjusted according to the subfield of the frame, which will be described with reference to FIG. 12.

FIG. 12 illustrates adjusting the first embodiment of FIG. 7 according to a subfield of a frame.

As shown in FIG. 12, when one frame is driven by dividing into eight subfields, and the subfields are arranged in the order of low gray scale weights, for example, a subfield to which low gradation pulses are applied. 7 to 10 of the present invention can be applied to the embodiment.

That is, for example, the voltage of the positive waveform applied to the sustain electrode in one or more of a setdown period or an address period in a low number subfield up to a third subfield in order of low gray scale weight is shown in FIG. 12. The number of sustain pulses may be compensated for by stacking wall charges by varying the first voltage level from the first voltage level with a predetermined slope.

That is, as in the case where the above-mentioned average image level APL is high, according to the embodiment of the present invention, even if the number of sustain pulses is reduced, there is an effect of preventing mis-discharge. In other words, by ensuring the address discharge in the address period, it is possible to accurately maintain the state of the wall charge in the address period before the sustain discharge occurs so that the sustain discharge can occur smoothly even if the number of the sustain pulses is reduced.

In addition, the voltage of the positive waveform in the plasma display device of the present invention is not limited thereto, and the plurality of sustain electrodes may be divided and adjusted according to the sustain electrode group, which will be described with reference to FIG. 13.

FIG. 13 is a diagram illustrating one embodiment of FIG. 7 being adjusted for each sustain electrode group. FIG.

As shown in FIG. 13, the sustain electrode group may be formed by dividing the sustain electrodes by a predetermined number. That is, for example, among the 100 sustain electrodes 1100 formed on the plasma display panel, the A sustain electrode group 1101 is from Z1 to Z25, the B sustain electrode group 1102 is from Z26 to Z50, and the C sustain electrode is from Z51 to Z75. The groups 1103 and Z76 to Z100 may be divided into the D sustain electrode groups 1104 so that the voltages of the positive waveforms may be differently applied to each electrode group during any one of a setdown period and an address period or an address period.

For example, when scan pulses are sequentially applied to an electrode group in which address discharge occurs first, that is, scan electrodes are sequentially generated, the voltage of the positive waveform is differently applied to each sustain electrode group corresponding to the order in which the scan pulses are applied. More specifically, the above-described embodiment of FIGS. 8 to 10 may be applied to the sustain electrode group in which the scan pulse is applied first, that is, the address discharge occurs first.

That is, the sustain electrode group corresponding to the discharge cell in which the address discharge occurred at the beginning of the address period. For example, in the A electrode group 1101, the wall charge gradually disappears as the address period progresses, so that the voltage of the positive waveform with the slope is decreased. Can be authorized. More specifically, the address discharge is strongly increased at the start of the address period by lowering the voltage from the first voltage level, for example, the sustain voltage Vs level, to a second voltage level higher than the first voltage level, for example, the ground GND voltage level by a predetermined slope. By bursting, the wall charges can be more reliably generated to prevent the loss of wall charges. In addition, the present invention is not limited thereto, and the magnitude of the slope of the positive waveform voltage is adjusted for each of the A sustain electrode group 1101, the B sustain electrode group 1102, the C sustain electrode group 1103, and the D sustain electrode group 1104. I can drive it.

In another example, when a scan pulse is sequentially applied to the electrode group where the address discharge occurs later, that is, the scan electrode is sequentially generated, the voltage of the positive waveform is differently applied to each sustain electrode group corresponding to the order in which the scan pulse is applied. do. More specifically, the above-described embodiment of FIGS. 8 to 10 may be applied to the sustain electrode group in which the scan pulse is applied later, that is, the address discharge occurs later.

That is, since the wall charges accumulated in the reset period gradually disappear as the discharge cells in which the address discharge has occurred in the last section close to the end of the address period, accurate address discharge is difficult to occur even when a scan pulse is applied. . Thus, the sustain electrode group corresponding to the discharge cell in which the address discharge occurs in the second half of the address period, for example, the D-stan electrode group, is more specifically, a second voltage level higher than the first voltage level at the first voltage level, for example, the ground GND level. For example, it is possible to prevent the loss of the wall charges by increasing the sustain voltage Vs to a predetermined slope to gradually accumulate the wall charges to form more wall charges. In addition, as described above, the magnitude of the slope of the voltage of the positive waveform is determined for each of the A sustain electrode group 1101, the B sustain electrode group 1102, the C sustain electrode group 1103, and the D sustain electrode group 1104. It can also be driven by adjustment.

Further, not only one embodiment in which the voltage of the above-described positive waveform is varied with a predetermined slope from the first voltage level to the second voltage level, but also two embodiments in which the voltage of the positive waveform is driven to have three or more voltage levels may be used. Referring to 14 to 19 more clearly as follows.

14 is a view showing two embodiments of the plasma display device of the present invention.

As shown in FIG. 14, the plasma display apparatus of the present invention includes a sustain driver 700 and a driving pulse controller 740 for driving the sustain electrode.

The sustain driver 700 includes a sustain voltage applying unit 710 for applying a positive waveform voltage and a sustain voltage to the sustain electrode Z, and a base voltage applying unit 720 for applying a base voltage to the sustain electrode Z. Include.

The sustain voltage applying unit 710 includes a first voltage source V1 for supplying a sustain voltage to the sustain electrode Z, a first switch Q1 for controlling the sustain voltage supply, and a second voltage for supplying a positive waveform. And a voltage source V2.

The base voltage applying unit 720 includes a third voltage source V3 for supplying the base voltage to the sustain electrode Z and a second switch Q2 for controlling the supply of the base voltage.

The first voltage source V1 described above is connected to one end of the first switch Q1, and the other end of the first switch Q1 is connected to one end of the second switch Q2 and the other end and sustain of the driving pulse controller 740. It is commonly connected to the phosphorus electrode Z. The sustain electrode Z is connected to the panel Cp so that driving voltages are applied to the panel Cp through the sustain electrode Z.

The second voltage source V2 is connected to one end of the driving pulse controller 740, and the third voltage source V3 is connected to the other end of the second switch Q2.

Here, the second voltage source V2 includes a plurality of voltage sources for applying voltages having different magnitudes, respectively. That is, as illustrated in the second voltage source V2 of FIG. 14, a plurality of voltage sources such as Va, Vb, Vc, and Vd apply a stepped positive waveform voltage to the sustain electrode. In addition, when applying the voltage of the sustain voltage (Vs) level of the level of the voltage of the positive waveform applied to the sustain electrode (Z) in at least one of the set-down period or the address period and the one end of the driving pulse control unit 740 described above; The first voltage source V1 for supplying a voltage having a sustain voltage level may be connected to simplify the driving apparatus by integrating the first voltage source.

Further, an energy recovery circuit unit 730 for recovering reactive power of the plasma display panel Cp is further provided at the other end of the first switch Q1, the other end of the driving pulse controller 740, and one end of the second switch Q2. The common connection minimizes the reactive power of the panel, reducing power consumption.

In this case, the driving pulse controller 740 described above has three or more different voltage levels for the positive waveform applied to the sustain electrode Z during the set down period and the address period or the address period of the subfield of the frame. It includes, so that the size is changed in the sequential order at three or more voltage levels. A detailed description thereof will be described later with reference to FIGS. 15 to 16.

More specifically, the driving pulse control unit 740 of the present invention has a predetermined voltage in at least one of the sections in which the voltage of the positive waveform applied to the sustain electrode Z is varied in sequential order at three or more voltage levels. The slope may be varied with the slope, which may be formed by the resistor VR2. The resistor may be one of a variable resistor or a fixed resistor, and its value may be varied to form a voltage slope that matches the characteristics of the panel, that is, the length of the address period or the wall charge distribution.

The driving waveforms according to the second embodiment of the plasma display device according to the present invention will be described with reference to FIG. 15.

15A to 15D are diagrams illustrating exemplary driving waveforms according to the second exemplary embodiment of FIG. 14.

As shown in Figs. 15A to 15D, the voltage of the positive waveform applied to the sustain electrode Z during the setdown period and the address period or the address period of the subfield includes three or more different voltage levels. At the three or more voltage levels, their magnitudes are varied in sequential order. More specifically, the voltage of the positive waveform may be applied to increase stepwise as shown in FIG. 15A.

In this configuration of the voltage of the stepped positive waveform, it can be adjusted in more detail. Specifically, first, as shown in FIG. 15B, the voltage of the positive waveform is varied in sequential order at three or more voltage levels. One or more of the sections may be varied with a predetermined slope. That is, in the plasma display apparatus of the present invention described with reference to FIG. 14, the voltage applied due to the resistance VR2 of the driving pulse controller may have a predetermined slope.

In addition, as shown in FIG. 15C, when the magnitudes of the three or more voltage levels vary in sequential order, the voltage holding time may be adjusted for each voltage level. As shown in FIG. 15C, the wall charge may be arbitrarily adjusted by varying the voltage holding time.

In addition, as shown in FIG. 15D, three or more voltage levels may be set in various ways to make different voltage differences. As shown in the circled region of FIG. 15D, the voltage difference may be increased stepwise to increase the discharge more strongly in a desired section.

The two embodiments of the method of driving the plasma display device of the present invention described above are not limited thereto. That is, the combination of the above-described configurations of 15a to 15d may be implemented.

The reason for adjusting the voltage of the positive waveform applied to the sustain electrode is to prevent the loss of wall charge. That is, by applying a voltage increasing stepwise, it is possible to gradually accumulate wall charges to prevent the loss of wall charges. By thus preventing erroneous discharge, the accuracy of discharge of the plasma display device can be improved.

In particular, when the plasma display device is driven, the wall charges and the space charges in the discharge cells are increased in a high temperature or high temperature environment, and the wall charges are likely to be lost. Thus, by setting the critical temperature of the high temperature, the voltage of the positive waveform of the present invention can be adjusted as described above when the critical temperature is higher. That is, the voltage of the positive waveform applied to the sustain electrode during the set down period and the address period or the address period of the subfield of the frame above the threshold temperature includes three or more different voltage levels, and three or more voltages. It is possible to prevent the high-temperature mis-discharge by varying the size in the sequential order at the level.

In this way, by preventing erroneous discharge and preventing loss of wall charges, there is an effect of increasing the accuracy of the discharge and improving the jitter characteristic of delaying the address discharge for selecting the discharge cells to be turned on in the above-described address period.

Such two embodiments of the plasma display device of the present invention of FIG. 14 are not limited thereto, and driving waveforms as shown in FIG. 16 may be implemented.

16A to 16B are diagrams illustrating another example of driving waveforms according to the second exemplary embodiment of FIG. 14.

As shown in Figs. 16A to 16B, the voltage of the positive waveform applied to the sustain electrode Z during the setdown period and the address period or the address period of the subfield includes three or more different voltage levels. At the three or more voltage levels, their magnitudes are varied in sequential order. That is, more specifically, the voltage of the positive waveform may be applied to decrease stepwise as shown in FIG. 16A.

In this configuration of the voltage of the stepped positive waveform can be adjusted in more detail. Specifically, first, as shown in FIG. 16B, the voltage of the positive waveform is varied in sequential order at three or more voltage levels. One or more of the sections may be varied with a predetermined slope. That is, in the plasma display apparatus of the present invention described with reference to FIG. 14, the voltage applied due to the resistance of the driving pulse controller may have a predetermined slope.

In addition, as shown in FIG. 16C, when the magnitudes of the three or more voltage levels vary in sequential order, the voltage holding time may be adjusted for each voltage level. As shown in FIG. 16C, the wall charge may be arbitrarily adjusted by varying the voltage holding time.

In addition, as shown in FIG. 16D, three or more voltage levels may be set in various ways to make different voltage differences. As shown in the circled region of FIG. 16D, the voltage difference can be increased stepwise to reduce the discharge more strongly in a desired section.

Also, more preferably, in the embodiments of FIGS. 16A to 16D, as the voltage level of the positive waveform gradually decreases, the width of the scan pulse sequentially applied to the scan electrode may also be adjusted. same.

FIG. 17 is a view illustrating a different sustain time of a scan pulse in FIGS. 16A to 16B.

As shown in FIG. 17, the voltage of the positive waveform applied to the sustain electrode Z may include three or more different voltage levels, and the magnitudes of the three voltage levels may decrease in sequential order. . That is, it is possible to form a stepped waveform in which the voltage level gradually decreases.

While the voltage of the positive waveform having the negative slope is supplied, scan pulses (-Vy) for selecting discharge cells are sequentially applied to the plurality of scan electrodes Y1 to Yn. The longer the pulse, the longer the duration of the pulse. That is, as the voltage of the positive waveform falls, the sustain period of the scan pulse becomes longer (t1, ... t2, t3, t4), thereby minimizing the possibility of loss of wall charge.

In addition, the scan pulse may be adjusted by forming a scan electrode group obtained by dividing a plurality of scan electrodes in a scanning order. That is, the scan pulse holding intervals for each scan electrode group may be set differently, and may be implemented in various forms. As such, the maintenance time of the scan pulse can be adjusted differently for each scan electrode, thereby improving high-speed driving and address margin.

In addition, the voltage of the positive waveform in the plasma display device of the present invention may be adjusted according to an average picture level (APL), and the description of the average picture level (APL) has been described above. Omit.

Briefly, in the two embodiments of the plasma display apparatus of the present invention, the voltage of the above-described positive waveform is adjusted according to the average image level APL. For example, as described above, the average image level APL is relatively high. The second embodiment of the present invention described with reference to FIGS. 14 to 17 described above in order to prevent a decrease in the accuracy of discharge due to a relatively large number of discharge cells that are turned on on the plasma display panel is reduced. An example can be applied. That is, for example, the second embodiment of the present invention can be applied above the threshold level by setting the threshold level among the average image level APL.

As described above, when the second embodiment of the present invention is applied in the case where the average image level APL is high, even if the number of sustain pulses is reduced, there is an effect of preventing mis-discharge. In other words, by ensuring the address discharge in the address period, it is possible to accurately maintain the state of the wall charge in the address period before the sustain discharge occurs so that the sustain discharge can occur smoothly even if the number of the sustain pulses is reduced.

In addition, the voltage of the positive waveform may be adjusted according to the subfield of the frame in the plasma display apparatus of the present invention.

FIG. 18 illustrates adjusting the second embodiment of FIG. 14 according to a subfield of a frame.

As shown in FIG. 18, when one frame is driven by dividing into eight subfields, and the subfields are arranged in order of low gray scale weights, for example, a subfield to which low gradation pulses are applied. The second embodiment of FIGS. 14 to 17 of the present invention can be applied to this.

That is, for example, the positive waveform is applied to the sustain electrode during the set down period and the address period or the address period in the predetermined number of subfields in the order of low gray scale weight, and the low gray level subfield up to the third subfield in FIG. 18. The voltage of 3 may have three or more different voltage levels, and the magnitudes of the three or more voltage levels may be varied in a sequential order, thereby accumulating wall charges, thereby compensating for the decrease in the number of sustain pulses.

That is, as in the case where the above-described average image level APL is high, the second embodiment of the present invention has the effect of preventing mis-discharge even if the number of sustain pulses is reduced. In other words, by ensuring the address discharge in the address period, it is possible to accurately maintain the state of the wall charge in the address period before the sustain discharge occurs so that the sustain discharge can occur smoothly even if the number of the sustain pulses is reduced.

In addition, the voltage of the positive waveform in the plasma display device of the present invention is not limited thereto, and the plurality of sustain electrodes may be divided and adjusted according to the sustain electrode group, which will be described with reference to FIG. 19.

FIG. 19 is a diagram illustrating adjustment of the second embodiment of FIG. 14 for each sustain electrode group. FIG.

As shown in FIG. 19, the sustain electrode group may be formed by dividing the sustain electrodes by a predetermined number. That is, for example, among the 100 sustain electrodes 1100 formed on the plasma display panel, the A sustain electrode group 1101 is from Z1 to Z25, the B sustain electrode group 1102 is from Z26 to Z50, and the C sustain electrode is from Z51 to Z75. The groups 1103 and Z76 to Z100 may be divided into the D sustain electrode groups 1104 so that the voltages of the positive waveforms may be differently applied to each of the electrode groups for one or more periods of three or more address periods.

For example, when scan pulses are sequentially applied to an electrode group in which address discharge occurs first, that is, scan electrodes are sequentially generated, the voltage of the positive waveform is differently applied to each sustain electrode group corresponding to the order in which the scan pulses are applied. More specifically, the second embodiment of FIGS. 15 to 17 described above is applied to the sustain electrode group to which the scan pulse is applied first, that is, the address discharge occurs first.

That is, the sustain electrode group corresponding to the discharge cells in which the address discharge occurred at the beginning of the address period. For example, in the A electrode group 1101, the wall charge gradually disappears as the address period progresses. The voltage of the waveform can be applied. More specifically, at the three or more voltage levels of the voltage of the positive waveform, the magnitude thereof decreases in a sequential order, so that the address discharge is strongly expelled at the beginning of the address period, thereby generating the wall charge more reliably, thereby preventing the loss of the wall charge. . In addition, the present invention is not limited thereto, and the magnitude of the slope of the positive waveform voltage is adjusted for each of the A sustain electrode group 1101, the B sustain electrode group 1102, the C sustain electrode group 1103, and the D sustain electrode group 1104. It can also be driven.

In another example, when a scan pulse is sequentially applied to the electrode group where the address discharge occurs later, that is, the scan electrode is sequentially generated, the voltage of the positive waveform is differently applied to each sustain electrode group corresponding to the order in which the scan pulse is applied. do. More specifically, the second embodiment of FIGS. 15 to 17 described above may be applied to a sustain electrode group in which a scan pulse is applied later, that is, address discharge occurs later.

That is, since the wall charges accumulated in the reset period gradually disappear as the discharge cells in which the address discharge has occurred in the last section close to the end of the address period, accurate address discharge is difficult to occur even when a scan pulse is applied. .

Thus, the sustain electrode group corresponding to the discharge cell in which the address discharge occurs in the latter part of the address period, for example, the D sustain electrode group, is more specifically a wall in which the magnitude is increased in sequential order at three or more voltage levels of the voltage of the positive waveform. By gradually accumulating electric charges, more wall charges can be formed, thereby preventing the loss of wall charges. In addition, as described above, the magnitude of the slope of the voltage of the positive waveform is determined for each of the A sustain electrode group 1101, the B sustain electrode group 1102, the C sustain electrode group 1103, and the D sustain electrode group 1104. It can also be driven by adjustment.

As described above, the plasma display apparatus and the driving method thereof according to the present invention can arbitrarily control the state of the wall charges as described above, thereby preventing the wall charges from being lost and thus preventing the misdischarge. That is, by adjusting the voltage of the positive waveform in accordance with the order in which the address discharge occurs, the wall charge is sufficiently secured to accurately occur until the last address discharge.

In addition, it is possible to adjust the state of the wall charge in accordance with the temperature to suppress the mis-discharge at a high temperature to burst the more accurate discharge has the effect of improving the reliability of the drive.

In this way, the accuracy of the discharge is improved, thereby improving the delay phenomenon of the above-described address discharge, thereby improving the jitter characteristic. As a result, the address margin is improved, thereby enabling high speed driving. Here, looking at the improved jitter characteristic of one of the effects of the present invention as shown in FIG.

20 is a diagram showing the jitter characteristic of the address discharge of the present invention.

As shown in FIG. 20, an optical waveform according to time of address discharge, which is an example of the discharge of the plasma display panel of the present invention, is illustrated. In FIG. 20, for example, the time duration of the optical waveform of 500 consecutive address discharges is displayed.

That is, the time from when the pulse for the first address discharge starts to be applied to the discharge cells during the operation of the plasma display device of the present invention until the address discharge is sequentially generated for each discharge cell and the last address discharge occurs is approximately 1.3 ms. It is shown. This is shorter than that of the conventional address discharge time of 2.5, which can be seen that the plasma display device of the present invention and its driving method exhibit an excellent effect of improving jitter characteristics.

Furthermore, by enabling the address discharge to occur accurately and stably, there is an effect that the sustain discharge caused by the scan electrode Y and the sustain electrode Z, which are display discharges, can also be generated more accurately.

Accordingly, the plasma display device of the present invention can display a high quality image through more accurate discharge.

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 plasma display device and the driving method thereof of the present invention have an effect of sufficiently securing wall charges to prevent mis-discharge.

In addition, the plasma display device and the driving method thereof according to the present invention have an effect of arbitrarily controlling wall charges.

In addition, the plasma display device and the driving method thereof of the present invention have the effect of improving the accuracy of the discharge.

In addition, the plasma display device and the driving method thereof according to the present invention have an effect of improving jitter characteristics.

In addition, the plasma display device and the driving method thereof according to the present invention have an effect of preventing erroneous discharge at a high temperature by driving in response to temperature.

In addition, the plasma display device and the driving method thereof of the present invention have the effect of enabling high-speed driving by improving the address margin.

Claims (28)

A plasma display panel including a plurality of scan electrodes and a plurality of sustain electrodes; A scan driver configured to apply, to the plurality of scan electrodes, a second scan pulse having a later time order than the first scan pulse and the first scan pulse and having a longer duration of the scan pulse during an address period; And By controlling a sustain driver that drives the plurality of sustain electrodes, a voltage of a positive waveform applied to the sustain electrode is set at a first voltage level during one of a set down period and an address period or an address period of a subfield of a frame. A driving pulse controller configured to vary the voltage with a predetermined slope at a predetermined voltage level and adjust the voltage of the positive waveform according to an average picture level (APL); Plasma display device comprising a. The method of claim 1, The sustain drive unit And a sustain voltage applying unit for applying a voltage of the positive waveform to the sustain electrode and a base voltage applying unit for applying a base voltage to the sustain electrode. The method of claim 2, The sustain voltage applying unit A first voltage source for supplying the voltage of the positive waveform to the sustain electrode and a first switch for controlling the voltage supply of the positive waveform; The base voltage applying unit A second voltage source for supplying the base voltage to the sustain electrode and a second switch for controlling the supply of the base voltage; The first voltage source is commonly connected to one end of the first switch and one end of the driving pulse controller, The second voltage source is connected to the other end of the second switch, And one end of the second switch is commonly connected to the other end of the driving pulse controller, the other end of the first switch, and the sustain electrode. The method of claim 3, wherein And the first voltage source is a voltage source commonly used to supply the voltage of the positive waveform and the sustain voltage applied to the sustain electrode during the sustain period of the subfield of the frame. The method of claim 3, wherein And an energy recovery circuit unit for recovering reactive power of the plasma display panel is further connected to the other end of the first switch, the other end of the driving pulse controller, and one end of the second switch. The method of claim 1, And a resistor having a predetermined slope when the voltage of the positive waveform applied to the sustain electrode is changed from the first voltage level to the second voltage level. The method of claim 1, And the first voltage level is a ground level (GND). The method of claim 1, And said second voltage level is a sustain voltage level (GND). delete delete The method of claim 1, The sustain drive unit Characterized in that the voltage of the positive waveform applied to the sustain electrode is different from other subfields during the set-down period of one or more subfields of the plurality of subfields of the frame and one of an address period or an address period. Display device. The method of claim 1, The sustain drive unit Above a threshold temperature, the voltage of the positive waveform applied to the sustain electrode during the set down period and the address period or the address period of the subfield of the frame has a predetermined slope from the first voltage level to the second voltage level. Plasma display device characterized in that it is variable. The method of claim 1, And dividing the sustain electrode into a plurality of electrode groups, and differently adjusting the voltage of the positive waveform applied to each electrode group. A plasma display panel including a plurality of scan electrodes and a plurality of sustain electrodes; A scan driver configured to apply, to the plurality of scan electrodes, a second scan pulse having a later time order than the first scan pulse and the first scan pulse and having a longer duration of the scan pulse during an address period; And By controlling the sustain driver which drives the plurality of sustain electrodes, the voltage of the positive waveform applied to the sustain electrode during one of the set-down period and the address period or the address period of the subfield of the frame has three or more voltage levels. A driving pulse controller configured to vary in a sequential order and adjust the voltage of the positive waveform according to an average picture level (APL); Plasma display device comprising a. The method of claim 14, The driving pulse controller And the voltage of the positive waveform is varied with a predetermined slope in at least one of the sections in which the magnitudes of the positive waveforms vary in sequential order. The method of claim 14, The sustain drive unit And a sustain voltage applying unit for applying a voltage to the sustain electrode and a ground voltage applying unit for applying a base voltage to the sustain electrode. The method of claim 16, The sustain voltage applying unit A first voltage source for supplying a sustain voltage applied to the sustain electrode, a first switch for controlling the sustain voltage supply, and a second voltage source for supplying a voltage of the positive waveform; The base voltage applying unit A third voltage source for supplying the base voltage to the sustain electrode and a second switch for controlling the supply of the base voltage; The first voltage source is connected to one end of the first switch, the other end of the first switch is commonly connected to one end of the second switch, the other end of the driving pulse controller, and the sustain electrode, The second voltage source is connected to one end of the driving pulse controller; And the third voltage source is connected to the other end of the second switch. The method of claim 17, And the second voltage source includes a plurality of voltage sources for applying voltages having different magnitudes. The method of claim 17, The driving pulse controller And when the voltage of the positive waveform is at the sustain voltage level, one end thereof is commonly connected to the first voltage source so that the first voltage source supplies the voltage of the positive waveform. The method of claim 17, And an energy recovery circuit unit for recovering reactive power of the plasma display panel is further connected to the other end of the first switch, the other end of the driving pulse controller, and one end of the second switch. The method of claim 15, And a resistor having a predetermined slope in a section in which a voltage of a positive waveform applied to the sustain electrode is sequentially changed at three or more voltage levels. The method of claim 14, The driving pulse controller The voltage of the positive waveform applied to the sustain electrode during the set down period and the address period or the address period of the subfield of the frame is increased in order of magnitude at the three or more voltage levels. Plasma display device. The method of claim 14, The driving pulse controller The voltage of the positive waveform applied to the sustain electrode during the set down period and the address period or the address period of the subfield of the frame may be reduced in sequential order at the three or more voltage levels. Plasma display device. delete delete The method of claim 14, The sustain drive unit Characterized in that the voltage of the positive waveform applied to the sustain electrode is different from other subfields during the set-down period of one or more subfields of the plurality of subfields of the frame and one of an address period or an address period. Display device. The method of claim 14, The sustain drive unit Above the threshold temperature, the voltage of the positive waveform applied to the sustain electrode during one of the set-down period and the address period or the address period of the subfield of the frame is characterized in that the three or more voltage levels vary in sequential order. Plasma display device. The method of claim 14, And dividing the sustain electrode into a plurality of electrode groups, and differently adjusting the voltage of the positive waveform applied to each electrode group.

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