KR20070075207A - Plasma display apparatus - Google Patents

Abstract

A plasma display apparatus is provided to prevent flicker and enhance contrast characteristic of images by differently setting the number of sub-fields in two successive frames. A plasma display apparatus includes a plasma display panel and a driver. The plasma display panel includes electrodes. The driver drives the electrodes through different numbers of sub-fields(a,b) in two successive frames of plural frames. The two frames are formed with the same length, and have the same gray level weighted summation value. The difference of the number of the sub-fields, which are included in the two frames, is 1 to 4.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

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

2A to 2B are diagrams for explaining an example of a plasma display panel included in the plasma display device of the present invention.

3 is a view for explaining an example of the operation of the plasma display device of the present invention;

4 is a view for explaining in more detail the operation of the drive unit of the plasma display device of the present invention.

5 is a diagram for explaining an average power level.

6A to 6C are diagrams for explaining a reason for differently adjusting the number of subfields included in two consecutive frames according to an average power level.

FIG. 7 is a diagram for explaining the same length of two consecutive frames including different numbers of subfields. FIG.

FIG. 8 is a diagram for explaining the reason why the contrast characteristic is improved when the number of subfields included in two consecutive frames is changed. FIG.

FIG. 9 is a diagram for explaining a reason why gray scale expression power is improved when the number of subfields included in two consecutive frames is changed. FIG.

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

100: plasma display panel 101: driving unit

The present invention relates to a plasma display device, and more particularly, to a plasma display device (Plasma Display Apparatus) in which the structure of a frame for implementing gray levels of an image on a plasma display panel is improved.

In general, the plasma display apparatus includes a plasma display panel in which a plurality of electrodes are formed and a driving unit for driving the electrodes of the plasma display panel.

Here, a plurality of electrodes are formed in the plasma display panel, and the driving unit supplies a predetermined driving voltage for generating discharge to the electrodes of the plasma display panel. Then, such a drive voltage causes discharge such as reset discharge, address discharge, sustain discharge, or the like within the discharge cell of the plasma display panel.

As described above, when a predetermined driving voltage is supplied and discharged in the discharge cell, the discharge gas filled in the discharge cell generates high frequency light such as vacuum ultraviolet rays.

Such high frequency light emits a phosphor formed in the discharge cell, where the phosphor layer generates visible light, thereby realizing an image.

Such a plasma display device has a spotlight as a next generation display device because of its thin and light configuration.

In addition, the plasma display apparatus including the plasma display panel generally includes a gray level of an image in a frame including at least one subfield divided into a reset period, an address period, and a sustain period. Will be implemented.

Meanwhile, in the conventional plasma display apparatus, the number of subfields included in a frame is always the same.

For example, a type using a frame using eight subfields always uses eight subfields, and a subfield including twelve subfields always uses twelve subfields.

Accordingly, there is a problem in that the image quality deteriorates due to the occurrence of flicker at a specific average power level.

In addition, it is difficult to improve the image quality of the image to be implemented due to the relatively low gray scale expressive power, and there is a problem in that contrast characteristics are deteriorated.

In order to solve the above problems, an object of the present invention is to provide a plasma display device for improving the image quality of an image to be implemented by improving the structure of a frame for implementing the gray level of the image.

Plasma display device of the present invention for achieving the above object preferably includes a plasma display panel in which the electrode is formed, and a driving unit for driving the electrode in a different number of subfields in two consecutive frames of the plurality of frames. Do.

Here, the two consecutive frames are characterized in that the same length.

In addition, the two consecutive frames are characterized by the same sum of gray scale weights.

In addition, the difference in the number of subfields included in the two consecutive frames is characterized in that more than one or less than four.

In addition, the two consecutive frames are characterized by different average power levels (APLs).

In addition, the number of subfields included in a frame having a higher average power level among the two consecutive frames is larger.

Hereinafter, the configuration of the plasma display device of the present invention will be described in detail with reference to the accompanying drawings.

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

Referring to FIG. 1, the plasma display apparatus of the present invention includes a plasma display panel 100 and a driver 101.

A plurality of electrodes are formed in the plasma display panel 100, and the driving unit 101 drives the electrodes by supplying a predetermined driving voltage to the electrodes of the plasma display panel 100.

Although one driving unit 101 is illustrated in FIG. 1, a plurality of driving units 101 may be divided according to electrodes formed on the plasma display panel 100. For example, when the address electrode X, the scan electrode Y, and the sustain electrode Z are formed in the plasma display panel 100, the driver 101 is not shown but the data driver, the scan driver, and the sustain driver are not shown. It can be divided into

Here, an example of the plasma display panel 100 will be described with reference to FIGS. 2A to 2B.

2A to 2B are views for explaining an example of the plasma display panel included in the plasma display device of the present invention.

First, referring to FIG. 2A, a plasma display panel includes a front panel 200 having a scan electrode 202 and Y and a sustain electrode 203 and Z formed on a front substrate 201, which is a display surface on which an image is displayed, and a rear substrate which forms a back surface. The rear panel 210 on which the address electrodes 213 and X are formed so as to intersect the scan electrode 202 and the sustain electrode 203 described above is coupled side by side with a predetermined distance therebetween.

The front panel 200 includes a scan electrode 202 and a sustain electrode 203 for mutually discharging in a discharge space, that is, a discharge cell, and maintaining light emission of the discharge cell.

The scan electrode 202 and the sustain electrode 203 are covered by one or more upper dielectric layers 204 that limit the discharge current and insulate the electrode pairs, and facilitate discharge conditions on top of the upper dielectric layer 204. A protective layer 205 is formed for this purpose.

The protective layer 205 is formed by, for example, depositing a material such as magnesium oxide (MgO) over the upper dielectric layer 204.

The rear panel 210 includes a plurality of discharge spaces, that is, barrier ribs 212 of stripe type (or well type) for partitioning the discharge cells. In addition, a plurality of address electrodes 213 are provided for supplying data pulses.

Here, in the discharge cells partitioned by the partition walls, the phosphor layer 214 that emits visible light for image display upon address discharge, preferably red (R), green (G), and blue (Blue :) B) a phosphor layer is formed.

A lower dielectric layer 215 is formed between the address electrode 213 and the phosphor layer 214 to insulate the address electrode 213.

Here, the scan electrode 202 and the sustain electrode 203 are preferably made of a conductive metal material. For example, it may be made of silver (Ag) material or indium tin oxide (ITO) material.

In particular, in consideration of light transmittance and electrical conductivity, the scan electrode 202 and the sustain electrode 203 may be formed to include a bus electrode made of silver and a transparent electrode made of ITO. Looking at this in more detail as shown in Figure 2b.

In FIG. 2B, the scan electrode 202 and the sustain electrode 203 are formed between the front substrate 201 and the upper dielectric layer 204 as in region A of FIG. 2A.

Referring to FIG. 2B, the scan electrode 202 and the sustain electrode 203 of the plasma display panel of the present invention are formed to generate surface discharge, and emit light generated in the discharge cell to the outside and secure driving efficiency. For this purpose, the transparent electrodes 202a and 203a formed of a transparent ITO material and the bus electrodes 202b and 203b made of an opaque metal material are preferably included.

As such, the reason why the scan electrode 202 and the sustain electrode 203 include the transparent electrodes 202a and 203a is that the visible light generated in the discharge cell is effectively emitted when emitted to the outside of the plasma display panel. For that.

In addition, the reason why the scan electrode 202 and the sustain electrode 203 include the bus electrodes 202b and 203b is that the scan electrode 202 and the sustain electrode 203 include only the transparent electrodes 202a and 203a. In this case, the driving efficiency can be reduced because the electrical conductivity of the transparent electrodes 202a and 203a is relatively low, so as to compensate for the low electrical conductivity of the transparent electrodes 202a and 203a which can cause such a reduction in the driving efficiency. to be.

2A to 2B, only one example of the plasma display panel of the present invention is shown and described, and the present invention is not limited to the plasma display panel having the structure of FIGS. 2A to 2B. For example, although only the case where the upper dielectric layer 204 and the lower dielectric layer 215 are one layer is illustrated, at least one or more of the upper dielectric layer 204 and the lower dielectric layer 215 may be a plurality of layers. It is also possible to form a layer of.

That is, the plasma display panel which can be applied to the plasma display device of the present invention is formed of an electrode, preferably a scan electrode 202, a sustain electrode 203, and an address electrode 213. It is.

Next, the description of FIG. 2A to FIG. 2B will be finished, and FIG. 1 will be described again.

The driving unit 101 of FIG. 1 supplies a predetermined driving voltage to an electrode formed in the plasma display panel 100 in a frame including one or more subfields to drive the gray level of an image. Express

In particular, it is more preferable that the driving unit 101 drives electrodes with different numbers of subfields in two consecutive frames among the plurality of frames.

For example, the driving unit 101 may drive the address electrode X by supplying a data pulse of the data voltage Vd to the address electrode X of the plasma display panel 100.

In addition, it is preferable to drive the scan electrode Y by supplying a ramp-up pulse, a ramp-down pulse, a negative scan pulse, and a sustain pulse to the scan electrode Y.

In addition, the driving unit 101 preferably supplies a sustain bias voltage Vz and a sustain pulse to the sustain electrode Z to drive the sustain electrode Z.

An example of the operation of the plasma display apparatus of the present invention will be described with reference to FIG. 3.

3 is a view for explaining an example of the operation of the plasma display device of the present invention in detail.

Referring to FIG. 3, a driving waveform used in a subfield of the plasma display device of the present invention is shown.

For example, a ramp-up waveform in which the voltage gradually rises may be supplied to the scan electrode Y in the setup period of the reset period.

Due to this rising ramp waveform, a weak dark discharge, that is, a setup discharge, occurs in the discharge cell. This setup discharge causes a certain amount of wall charges to accumulate in the discharge cell.

In addition, in the set-down period after the setup period, a ramp-down that ramps down gradually from a predetermined positive voltage lower than the peak voltage of the ramp ramp after supplying the ramp ramp waveform to the scan electrode Y. You can supply waveforms.

As a result, weak erase discharge, that is, set-down discharge, occurs in the discharge cell. This set-down discharge erases a part of the wall charges accumulated in the discharge cell by the previous setup discharge, and the wall charges such that the address discharge can be stably generated in the discharge cell remain uniformly.

In the address period after the reset period including the set-up period and the set-down period, the scan electrode includes the scan reference voltage Vsc and the voltage (-Vy) of the negative scan pulse Scan falling from the scan reference voltage Vsc. It can supply to (Y).

In addition, when the voltage (−Vy) of the negative scan pulse is supplied to the scan electrode Y, the voltage Vd of the data pulse may be supplied to the address electrode X correspondingly.

In addition, it is preferable to supply the sustain bias voltage Vz to the sustain electrode Z in the address period in order to prevent the occurrence of erroneous discharge due to the interference of the sustain electrode Z in the address period.

In the address period, the voltage difference between the voltage of the negative scan pulse (-Vy) and the voltage of the data pulse (Vd) and the wall voltage caused by the wall charges generated in the reset period are added to the voltage Vd of the data pulse. An address discharge is generated in the discharge cells supplied.

In such a discharge cell selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs of the sustain pulse is supplied.

In the sustain period after the address period, the sustain pulse SUS can be supplied to the scan electrode Y and / or the sustain electrode Z. FIG.

Accordingly, the discharge cells selected by the address discharge have the scan voltage (Y) and the sustain electrode each time the sustain pulse (SUS) is applied while the wall voltage in the discharge cell and the sustain voltage (Vs) of the sustain pulse (SUS) are added. Sustain discharge, that is, display discharge, occurs between (Z). Accordingly, a predetermined image is implemented on the plasma display panel.

Here, the driving unit of the plasma display apparatus of the present invention drives the electrodes of the plasma display panel with a different number of subfields in two consecutive frames of the plurality of frames.

4 is a view for explaining in more detail the operation of the drive unit of the plasma display device of the present invention.

Referring to FIG. 4, the plasma display apparatus of the present invention implements an image for one second using a plurality of frames. For example, as shown in FIG. 4, an image for 1 second is realized using a total of 60 frames.

Here, two consecutive frames, for example, the first frame and the second frame, implement an image using different numbers of subfields.

For example, in the second frame, an image is implemented in a total of five subfields as shown in (a), that is, first, second, third, fourth, and fifth subfields, and in the first frame, a total of six subfields as in (b) Implement an image with subfields.

Here, more preferably, two consecutive frames have different average power levels (APLs). For example, the average power level in the first frame and the average power level in the second frame are different.

Here, the average power level will be described with reference to FIG. 5 to help understand the present invention.

5 is a diagram for explaining an average power level.

Referring to FIG. 5, the average power level is determined according to the number of discharge cells that are turned on among discharge cells of the plasma display panel. Preferably, the number of sustain pulses per gray level decreases as the value of the average power level APL increases, and the number of sustain pulses per gray level increases as the value of the average power level APL decreases.

For example, when an image is displayed on a portion of a relatively large area on the screen of the plasma display panel 500 as shown in (b), that is, when the area 520 where the image is displayed is relatively large, When the number of discharge cells that are turned on among the plurality of discharge cells formed in the plasma display panel is relatively large (in this case, the APL level is relatively large), the number of discharge cells that contribute to image display is relatively high. Since the number of sustain pulses per unit gray level supplied to each of the discharge cells contributing to the image display is relatively small, the total amount of power consumption of the plasma display panel is reduced.

On the contrary, when the image is displayed only on a portion of a relatively small area on the screen of the plasma display panel 500 as shown in (a), that is, when the area 510 where the image is displayed is relatively small, the plasma is expressed differently. When the number of discharge cells that are turned on among the plurality of discharge cells formed on the display panel is relatively small (in this case, when the APL level is relatively small), the image display because the number of discharge cells that contribute to the image display is relatively small. The number of sustain pulses per unit gray level supplied to each of the discharge cells contributing to R1 is relatively large. This improves the overall image quality of the plasma display panel by increasing the luminance of the portion where the image is displayed, while preventing a sudden increase in the total power consumption of the plasma display panel.

For example, when the average power level is a level, the number of sustain pulses per gray level is N accordingly.

In addition, when the average power level is a b level higher than the above-described a level, the number of sustain pulses per gray level corresponding thereto is M less than N described above.

The reason for varying the number of subfields included in two consecutive frames according to the average power level is as follows.

6A to 6C are diagrams for explaining a reason for differently adjusting the number of subfields included in two consecutive frames according to an average power level.

First, referring to FIG. 6A, a change in the length of one subfield according to an average power level is illustrated. Here, the subfield of (a) and the subfield of (b) are included in two consecutive frames having different average picture levels, for example, the first frame and the second frame of FIG. 4, and the subfield of (a) Subfields of (b) and (b) are assumed to have the same gray scale weight in the frame.

When the average power level is relatively high, for example, 10 sustain pulses included in the sustain period are set as in the subfield of (a).

On the other hand, when the average power level is relatively low, for example, 20 sustain pulses included in the sustain period are set as in the subfield of (b).

Accordingly, it can be seen that even if the gray scale weight is the same subfield, if the average power level of the corresponding frame is changed, the length of the corresponding subfield may also be changed.

Here, when the lengths of the subfields are compared, the case where the average power level is relatively high as shown in (a) is shorter than the case where the average power level is relatively low as in (b).

Next, referring to FIG. 6B, if the length of one subfield is changed due to the change in the average power level, the overall structure of the frame may also be changed.

For example, when the average power level is relatively high as in the frame of FIG. 6B, since the number of sustain pulses included in the subfields included in the frame is relatively small, all the subfields in one frame are not included. The percentage of occupancy is reduced. Here, in FIG. 6B, a portion not occupied by a plurality of subfields in one frame is indicated as W. FIG.

On the other hand, when the average image level is relatively low, such as the frame of (b), since the number of sustain pulses included in the subfields included in the frame is relatively large, the ratio of the plurality of subfields in one frame also occupies more than in the case of (a).

Next, referring to FIG. 6C, (a) shows a case where the average power level of the first frame, the second frame, and the third frame is relatively high.

On the other hand, (b) shows a case where the average power level of the first frame, the second frame, and the third frame is relatively low.

In the case of (b), when the average power level of the first frame, the second frame, and the third frame is relatively low, the number of sustain pulses included in the subfield of each frame is relatively large. The length of the portion occupied by the subfields in the frame is also relatively long.

Accordingly, when the first frame, the second frame, and the third frame are continuous, the interval between the subfields between the first frame and the second frame and the interval between the subfields between the second frame and the third frame are sufficiently short. As a result, the image by the first frame and the image by the second frame are sufficiently continuous.

Accordingly, when implemented on the plasma display panel, the image to be implemented is smoothly followed. That is, the image quality of the image to be implemented is sufficiently smooth.

On the other hand, in the case of (a), when the average power level of the first frame, the second frame, and the third frame is relatively high, the number of sustain pulses included in the subfield of each frame is relatively small. The proportion of subfields in the frame also becomes relatively small.

Accordingly, when the first frame, the second frame, and the third frame are continuous, the interval between the subfields between the first frame and the second frame and the interval between the subfields between the second frame and the third frame are relatively as W. It becomes long. Here, the W period is the same as the W period in FIG. 6B.

As a result, when the image by the first frame and the image by the second frame are successively implemented on the plasma display panel, or when the image by the second frame and the image by the third frame are successively implemented on the plasma display panel, A flicker phenomenon occurs due to the time difference between W between the image by the first frame and the image by the second frame and between the image by the second frame and the image by the third frame, respectively.

Accordingly, when viewing an image implemented by a frame having a relatively high average power level, a phenomenon such as flickering occurs on the screen of the viewer is detected. As a result, the picture quality deteriorates.

In this case, if the number of subfields included in two consecutive frames is different, the deterioration of image quality due to the occurrence of flicker can be prevented.

More specifically, since the number of sustain pulses included in the sustain period of the subfield is relatively small in a frame having a relatively high average power level, the number of subfields that may be included within a preset time may increase.

Accordingly, the number of subfields included in a frame having a relatively high average power level among two consecutive frames may be set more than in a case where the average power level is relatively low.

Then, when an image is implemented by two consecutive frames, for example, the first frame and the second frame, as shown in FIG. 4, a time difference between the image of the first frame and the image of the second frame can be reduced. As a result, deterioration in image quality due to occurrence of flicker can be prevented.

As such, when setting the number of subfields included in two consecutive frames differently, it is preferable to make the length of two consecutive subfields the same. This is as follows.

FIG. 7 is a diagram for describing the same length of two consecutive frames including different numbers of subfields.

Referring to FIG. 7, (a) is a case where a relatively large number of subfields is included in two consecutive frames, and (b) is a case where a relatively small number of subfields is included among two consecutive frames. .

Here, the frame in the case of (a) and the frame in the case of (b) have the same gray scale weight sum.

For example, in the case of (a), a total of 12 subfields is included, the gray scale weight of the first subfield is 1, the gray scale weight of the second subfield is 2, the gray scale weight of the third subfield is 4, and The gradation weight of the 4th subfield is 8, the gradation weight of the 5th subfield is 16, the gradation weight of the 6th subfield is 32, the gradation weight of the 7th subfield is 32, the gradation weight of the 8th subfield is 32, The gradation weight of the 9th subfield is 32, the gradation weight of the 10th subfield is 32, the gradation weight of the 11th subfield is 32, and the gradation weight of the twelfth subfield is 32.

Accordingly, the sum of gray scale weights from the first subfield to the twelfth subfield is 256.

In the case of (b), a total of eight subfields are included, the gray scale weight of the first subfield is 1, the gray scale weight of the second subfield is 2, the gray scale weight of the third subfield is 4, and the fourth subfield is The gray scale weight is set to 8, the gray scale weight of the fifth subfield is 16, the gray scale weight of the sixth subfield is 32, the gray scale weight of the seventh subfield is 64, and the gray scale weight of the eighth subfield is 128.

Accordingly, the sum of gray scale weights from the first subfield to the eighth subfield is 256 as shown in (a).

As described above, the reason why the sum of the total gray scale weights of two consecutive frames having different numbers of subfields is the same is to prevent a decrease in linearity of the image gray scale.

In addition, the length of two consecutive frames having different numbers of subfields is equal to d. As such, the reason for making the lengths of two consecutive frames having different number of subfields the same is to comply with a broadcast specification for realizing a one second image.

In particular, the reason why two consecutive frames having different numbers of subfields are the same is to prevent deterioration of image quality by preventing flicker from occurring.

That is, by making the lengths of two consecutive frames having different number of subfields the same, the image quality is deteriorated by preventing the occurrence of flicker by reducing the time difference between the images of the two frames when the image is implemented by the two consecutive frames. To prevent it.

On the other hand, it is preferable that the difference in the number of subfields included in these two consecutive frames is one or more and four or less.

For example, suppose that a frame including a relatively small number of subfields among two consecutive frames as shown in (b) includes a total of eight subfields. In this case, it is preferable that a frame including a relatively large number of subfields among two consecutive frames includes 9 or more and 12 or less subfields.

As such, the reason for the difference in the number of subfields included in two consecutive frames is one or more than four, because the difference in the number of subfields included in two consecutive frames is five or more. This is because the control operation of newly assigning a gray scale weight to each subfield becomes very complicated, and it is difficult to match the lengths of two consecutive frames.

As described above, if the number of subfields included in two consecutive frames is changed, it is possible to prevent a decrease in contrast characteristics. This is as follows.

FIG. 8 is a diagram for explaining a reason why the contrast characteristic is improved when the number of subfields included in two consecutive frames is changed.

Referring to FIG. 8, assuming that a magnitude of light generated by a reset pulse supplied in a reset period of one subfield as shown in (b) is 0.5 candela (cd / m ² ), the eight subs as shown in (a) For a frame including a field, the sum of the magnitudes of the light generated in the reset period is 0.5 candela (cd / m ² ) × 8 = 4 candelas (cd / m ² ).

On the other hand, in the case of a frame including 12 subfields as shown in (c), the sum of the magnitudes of the light generated in the reset period is 0.5 candela (cd / m ² ) × 12 = 6 candela (cd / m ² ). to be.

Accordingly, the sum of the magnitudes of the light generated in the reset period in two consecutive frames is 10 candelas (cd / m ² ), with an average of 5 candelas (cd / m ² ) per frame.

On the other hand, when all the frames consist of 12 subfields, the size of light generated in the reset period is 6 candelas (cd / m ² ) per frame.

As a result, the size of light generated in the reset period is reduced as compared with the case where all the frames are composed of 12 subfields, thereby improving the contrast characteristic.

In addition, as described above, by varying the number of subfields included in two consecutive frames, gray scale expressing power may be further improved. This is as follows.

FIG. 9 is a diagram for explaining a reason why gray scale expression power is improved when the number of subfields included in two consecutive frames is changed.

Referring to FIG. 9, it is assumed that the magnitude of light generated by the address discharge generated in the address period of one subfield is 0.5 candela (cd / m ² ) as shown in (b), and the sustain is generated by one sustain pulse. Assume that the size of light by discharge is 1 candela (cd / m ² ).

Here, in the case of a frame including eight subfields as shown in (a), when address discharge and sustain discharge are generated in the first subfield having a gray scale weight of 1, the total amount of light generated in the frame in case (a) is 0.5 candela (cd / m ² ) + 1 candela (cd / m ² ) = 1.5 candela (cd / m ² ).

Here, in the case of a frame including 12 subfields as shown in (c), if address discharge and sustain discharge are respectively generated in the subfield with gray weight value 1 and the second subfield with gray weight weight 2, The total amount of light generated in the frame of the case is [0.5 candela (cd / m ² ) + 1 candela (cd / m ² ) = 1.5 candela (cd / m ² )] + [0.5 candela (cd / m ² ) + 2 Candela (cd / m ² ) = 2.5 candela (cd / m ² )] = 4 candela (cd / m ² ).

Accordingly, the sum of the magnitudes of the light generated in two consecutive subfields is 5.5 candela (cd / m ² ), which is an average of 2.75 candelas (cd / m ² ) per frame.

As a result, when the subfield mapping of the image data in two consecutive frames is coordinated to be adjusted, a new gray scale cannot be realized in one frame. Accordingly, the gradation expression power is improved.

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 in detail above, the plasma display device of the present invention prevents deterioration of image quality due to flickering by varying the number of subfields included in two consecutive frames, and improves the contrast characteristics of the image. There is an effect of improving the gradation expression.

Claims (6)

A plasma display panel in which electrodes are formed; A driving unit for driving the electrode with a different number of subfields in two consecutive frames of a plurality of frames Plasma display device comprising a. The method of claim 1, And two consecutive frames have the same length. The method of claim 1, And two consecutive frames have the same sum of gray weights. The method of claim 1, And a difference in the number of subfields included in the two consecutive frames is one or more and four or less. The method of claim 1, And wherein the two consecutive frames have different average power levels (APLs). The method of claim 5, And the number of subfields included in a frame having a higher average power level among the two consecutive frames.

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