KR100802337B1 - Plasma display apparatus and the mathod of the apparatus - Google Patents

Abstract

A plasma display apparatus and a driving method thereof are provided to prevent effectively dark image sticking by varying the apply time of a reset pulse. A plasma display apparatus includes a plasma display panel(100) and drivers(200,300,400). The plasma display panel includes scan and sustain electrodes. The drivers extend the sustain period of a reset pulse supplied to the scan electrodes in a sub-field, which decreases the apply time of a sustain pulse supplied to scan or sustain electrodes according to the increment of an APL(Average Power Level). When the sustain period of a reset pulse is extended, the reset pulse has a smaller voltage amplitude than when the sustain period of the reset pulse is not extended.

Description

Plasma Display Apparatus and Driving Method thereof {Plasma Display Apparatus and the Mathod of the Apparatus}

1 illustrates a plasma display device according to an embodiment of the present invention.

2 illustrates a structure of a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 3 illustrates a frame for realizing grayscales of an image in a plasma display device according to an exemplary embodiment.

4 illustrates an operation of a plasma display device according to an embodiment of the present invention.

5 is for explaining the average brightness level in detail.

6 is for explaining the change in the number of sustain pulses according to the average brightness level control and the average brightness level control to prevent afterimages.

FIG. 7 illustrates that the sustain period of the reset pulse applied to the scan electrode is extended by the application time of the sustain pulse according to one embodiment of the present invention.

8 illustrates that the slope of the reset pulse becomes smaller during the sustain period of the reset pulse according to an embodiment of the present invention.

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

100: plasma display panel 200: first driver

300: second driver 400: third driver

The present invention relates to a display device, and more particularly, to a plasma display device and a driving method thereof.

In general, a plasma display apparatus is formed by attaching a plasma display panel for displaying an image and a driving unit for driving the plasma display panel to a rear surface of the plasma display panel.

The plasma display panel has a plurality of discharge cells formed by barrier ribs formed between the front substrate and the rear substrate of the plasma display panel on which an image is displayed. Each cell includes neon and helium. Or an inert gas containing a main discharge gas such as a mixture of neon and helium (Ne + He) and a small amount of xenon. A plurality of such discharge cells are gathered to form one pixel. For example, a red (R) discharge cell, a green (G) discharge cell, and a blue (B) discharge cell are assembled to form one pixel.

When the plasma display panel is discharged by a high frequency voltage, an inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has been spotlighted as a display device because of its thin and light configuration.

On the other hand, when the plasma display panel is displayed on the screen for a long time relatively bright letters on the dark screen, a strong discharge continues to occur at a specific position to cause the phosphor deterioration, even if other screens are displayed, the problem remains do.

An object of the present invention is to provide a plasma display device and a method of driving the same, which improve an afterimage in the afterimage prevention mode operation.

Plasma display device according to an embodiment of the present invention for achieving the above object is applied to the plasma display panel including the scan electrode and the sustain electrode and the sustain pulse applied to the scan electrode or the sustain electrode as the average brightness level is increased And a driver for extending the sustain period of the reset pulse applied to the scan electrode in the subfield whose time is shortened.

Further, the reset pulse includes a rising pulse and a falling pulse, and the extended sustain period of the reset pulse is an extended sustain period of at least one of the rising pulse and the falling pulse.

In addition, when the sustain period of the reset pulse is extended, the magnitudes of the maximum and minimum voltages of the reset pulse are the same as the magnitudes of the maximum and minimum voltages of the reset pulse when the sustain period of the reset pulse is not extended.

In addition, when the sustain period of the reset pulse is extended, the magnitude of the voltage of the reset pulse is smaller than the magnitude of the voltage of the reset pulse when the sustain period of the reset pulse is not extended.

Further, when the sustain period of the reset pulse is extended, the slope of the reset pulse is smaller than the slope of the reset pulse when the sustain period of the reset pulse is not extended.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a plasma display device according to an embodiment of the present invention.

1, a plasma display device according to an embodiment of the present invention includes a plasma display panel 100 including an electrode, a first driver 200, a second driver 300, and a third driver 400. do.

The plasma display panel 100 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals, and scan electrodes Y1 to Yn, sustain electrodes Z1 to Zk, and address electrodes X1 to Xm. ). The plasma display panel 100 will be described in detail with reference to FIG. 2.

The first driver 200, the second driver 300, and the third driver 400 may drive a predetermined driving pulse on a plurality of electrodes formed in the plasma display panel 100 in one or more subfields included in one frame. To supply.

The first driver 200 may supply a reset pulse to the scan electrodes Y1 to Yn to uniformly form a wall charge in the discharge cell. The sustain pulse is supplied to the scan electrodes Y1 to Yn so that the image is displayed while maintaining the scan pulse and the discharge.

In addition, the first driver 200 extends the sustain period of the reset pulse applied to the scan electrode in the subfield in which the application time of the sustain pulse applied to the scan electrode or the sustain electrode is shortened as the average brightness level increases. .

The second driver 300 supplies the sustain bias pulses to the sustain electrodes Z1 to Zk during the period in which the ramp ramps are generated and the address period under the control of the timing controller (not shown). The sustain pulse is supplied to the sustain electrodes Z1 to Zk so that the image is displayed.

In the third driver 400, inverse gamma correction and error diffusion are performed by an inverse gamma correction circuit, an error diffusion circuit, and the like, and then data mapped to each subfield is supplied by a subfield mapping circuit. The third driver 400 samples and latches data in response to a data timing control waveform from a timing controller (not shown), and then supplies the latched data to the address electrodes X1 to Xm.

The structure of the plasma display panel 100 included in the plasma display apparatus is as follows.

2 illustrates a structure of a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a plasma display panel according to an embodiment of the present invention includes a front panel 110 including a front substrate 111 on which a scan electrode 112 and a sustain electrode 113 are formed, and the scan electrode described above. The rear panel 120 including the rear substrate 121 on which the address electrode 123 intersects the 112 and the sustain electrode 113 is formed is bonded to each other at a predetermined interval.

Here, the scan electrode 112 and the sustain electrode 113 formed on the front substrate 111 are formed in parallel with each other to generate a discharge in the discharge cell and maintain the discharge of the discharge cell.

The scan electrode 112 and the sustain electrode 113 formed on the front substrate 111 need to consider light transmittance and electrical conductivity in order to emit light generated in the discharge cell to the outside and to secure driving efficiency. Accordingly, each of the scan electrode 112 and the sustain electrode 113 may include bus electrodes 112b and 113b made of metal such as silver and transparent electrode 112a made of transparent indium tin oxide (ITO). , 113a).

As such, the reason why each of the scan electrode 112 and the sustain electrode 113 includes the transparent electrodes 112a and 113a is that the visible light generated in the discharge cell is effectively emitted when emitted to the outside of the plasma display panel. To do that.

In addition, the reason why each of the scan electrode 112 and the sustain electrode 113 include the bus electrodes 112b and 113b is that each of the scan electrode 112 and the sustain electrode 113 has only the transparent electrodes 112a and 113a. In the case of inclusion, the driving efficiency can be reduced because the electrical conductivity of the transparent electrodes 112a and 113a is low, so as to compensate for the low electrical conductivity of the transparent electrodes 112a and 113a.

The structures of the scan electrode 112 and the sustain electrode 113 may be formed of only the bus electrodes 112b and 113b, respectively. That is, in the structure of the plasma display panel of FIG. 2, the transparent electrodes 112a and 113a may be omitted to form a single layer.

An upper dielectric layer 114 may be formed on the front substrate 111 on which the scan electrode 112 and the sustain electrode 113 are formed to cover the scan electrode 112 and the sustain electrode 113.

The upper dielectric layer 114 limits the discharge current of the scan electrode 112 and the sustain electrode 113 and insulates the scan electrode 112 and the sustain electrode 113.

A protective layer 115 may be formed on the upper dielectric layer 114 to facilitate discharge conditions. The protective layer 115 may be made of a material having a high secondary electron emission coefficient, for example, magnesium oxide (MgO).

Meanwhile, the address electrode 123 formed on the rear substrate 121 is an electrode that applies a data signal to the discharge cells.

The lower dielectric layer 125 may be formed on the rear substrate 121 on which the address electrode 123 is formed to cover the address electrode 123.

In the upper portion of the lower dielectric layer 125, a discharge space, that is, a partition wall 122 for partitioning the discharge cells is formed. The structure of the discharge cell may be formed in various shapes such as a stripe type, a well type (Dell type) delta type, and a honeycomb type.

In the discharge cells partitioned by the partition wall 122, a phosphor layer 124 is formed that emits visible light for image display during address discharge. For example, red (R), green (G), and blue (B) phosphor layers may be formed.

In the plasma display panel according to the exemplary embodiment described above, when a driving signal is applied to the scan electrode 112, the sustain electrode 113, and the address electrode 123, the plasma display panel may be disposed in the discharge cell partitioned by the partition wall 122. Discharge occurs in the image to realize the image.

In FIG. 2, only the plasma display panel according to the exemplary embodiment of the present invention is illustrated and described, and it is apparent that the exemplary embodiment of the present invention is not limited to the plasma display panel having the structure of FIG. 2.

The operation of the plasma display apparatus according to the exemplary embodiment of the present invention including the plasma display panel will be described with reference to FIGS. 3 to 4.

FIG. 3 illustrates a frame for realizing grayscales of an image in a plasma display device according to an exemplary embodiment.

4 is for explaining the operation of the plasma display device according to an embodiment of the present invention.

First, referring to FIG. 3, a frame for implementing gray levels of an image in a plasma display device according to an embodiment of the present invention is divided into several subfields having different emission counts.

Although not shown, each subfield has a reset period for initializing all discharge cells, an address period for selecting discharge cells to be discharged, and a sustain period for implementing gradation according to the number of discharges. It can be divided into (Sustain Period).

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

Meanwhile, the gray scale weight of the corresponding subfield may be set by adjusting the number of sustain pulses supplied in the sustain period. That is, a predetermined gray scale weight can be given to each subfield using the sustain period. For example, the gray scale weight of each subfield is 2 ⁿ by setting the gray scale weight of the first subfield to 2 ⁰ and the gray scale weight of the second subfield to 2 ¹ (where n = 0, 1). , 2, 3, 4, 5, 6, and 7) to increase the gray scale weight of each subfield. As such, by adjusting the number of sustain pulses supplied in the sustain period of each subfield according to the gray scale weight in each subfield, gray levels of various images are realized.

The plasma display device according to an embodiment of the present invention uses a plurality of frames to display an image of 1 second. For example, 60 frames are used to display an image of 1 second.

In FIG. 3, only one frame is composed of eight subfields. However, the number of subfields forming one frame may be variously changed. 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.

The image quality of the image implemented by the plasma display apparatus implementing the gray level of the image using the frame may be determined according to the number of subfields included in the frame. That is, when 12 subfields are included in a frame, gray levels of 2 ¹² images can be expressed. When 10 subfields are included in a frame, gray levels of 2 ¹⁰ images can be realized.

In addition, in FIG. 3, subfields are arranged in increasing order of gray scale weight in one frame. Alternatively, subfields may be arranged in order of decreasing gray scale weight in one frame, or gray weight. Subfields may be arranged regardless.

Next, referring to FIG. 4, the operation of the plasma display apparatus according to an exemplary embodiment of the present invention is shown in any one sub-field of a plurality of subfields included in the same frame as in FIG. 3. Each of the first driver 200, the second driver 300, and the third driver 400 described above with reference to FIG. 1 includes a scan electrode Y and a sustain electrode in at least one of a reset period, an address period, and a sustain period. Driving pulses are supplied to Z and the address electrode X. FIG.

The first driver 200 may supply the rising ramp pulse Ramp-up to the scan electrode Y in the setup period of the reset period.

Due to the rising ramp pulse, a weak dark discharge occurs in the discharge cells of the entire screen. Due to the set-up discharge, positive wall charges are accumulated on the address electrode X and the sustain electrode Z, and negative wall charges are accumulated on the scan electrode Y.

In addition, the first driving unit 200 supplies the rising ramp pulse to the scan electrode Y in the set down period, and then starts to fall from the positive voltage lower than the maximum voltage of the rising ramp pulse to ground level voltage GND. It is possible to supply a ramp-down ramp down to a specific voltage level below.

As a result, a weak erase discharge is generated in the discharge cell, thereby sufficiently erasing wall charges excessively formed in the discharge cell. By this set down discharge, wall charges such that the address discharge can stably occur remain uniformly in the discharge cell.

The second driver 300 supplies the sustain bias voltage Vzb to the sustain electrode Z during the set down period and the address period. The sustain bias voltage Vzb may reduce the voltage difference between the scan electrode Y and the sustain electrode Z to prevent erroneous discharge.

In addition, the first driver 200 may supply the scan electrode Y with a negative scan pulse that falls from the scan bias voltage in the address period. In addition, the third driver 400 supplies a positive data pulse to the address electrode X in response to the negative scan pulse.

As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, address discharge occurs in the discharge cell to which the data pulse is applied. In the discharge cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied.

In the sustain period after the address period, the first driver 200 and the second driver 300 supply the sustain pulse SUS to the scan electrode Y and the sustain electrode Z. FIG. Accordingly, the discharge cell selected by the address discharge is sustained between the scan electrode Y and the sustain electrode Z every time the sustain pulse SUS is applied while the wall voltage and the sustain pulse SUS are added in the discharge cell. Discharge occurs.

Such a driving method has been described in accordance with one embodiment, and an erase period for removing wall charges remaining after the sustain discharge after the sustain period may be further added, and the wall charges may be stably formed on the electrodes before the reset period. A pre reset period may be further added.

In addition, in FIG. 4, the first driver and the second driver are operated independently. However, the first driver and the second driver may be integrated.

On the other hand, the average brightness level APL varies depending on the supply of the sustain pulses supplied in the sustain period. In order to help the understanding of the embodiment of the present invention, the following will be described with reference to FIGS. 5 to 6 attached to the average brightness level (APL).

5 is for explaining the average brightness level in detail and FIG. 6 is for explaining the change in the number of sustain pulses according to the average brightness level control and average brightness level control.

Referring to FIG. 5, an average brightness level (APL) is determined according to the number of discharge cells that are turned on among discharge cells of the plasma display panel 100. That is, it is determined according to the area in which the image is displayed on the plasma display panel 100.

Here, as the average brightness level APL increases, the number of sustain pulses per gray level decreases, and as the average brightness level APL decreases, the number of sustain pulses per gray level increases.

For example, as shown in (b), when the area 620 on which the image is displayed on the screen of the plasma display panel 100 is relatively large, that is, among the plurality of discharge cells formed in the plasma display panel 100, On is turned on. When the number of discharge cells is relatively large, the number of discharge cells contributing to the image display is relatively large, so that the number of sustain pulses per unit gradation supplied to each of the discharge cells contributing to the image display is relatively small. Reduce the amount of power consumption

On the contrary, when the area 610 for displaying an image is relatively small on the screen of the plasma display panel 100 as shown in (a), that is, the discharge cells are turned on from among the plurality of discharge cells formed in the plasma display panel 100. When the number is relatively small, since the number of discharge cells contributing 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 the image display is relatively large. This increases the luminance of the portion where the image is displayed, thereby preventing a sudden increase in the total power consumption while increasing the overall luminance.

As an example, when the average brightness level is a level, the number of sustain pulses per gray level is N accordingly.

In addition, when the average brightness 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 the N described above.

Referring to FIG. 6, the average brightness level and the number and time of sustain pulses are shown.

When bright letters and pictures are displayed on the screen for a long time on a dark screen of the plasma display panel, strong discharge continues to occur at a specific position, resulting in deterioration of the phosphor, and afterimages may occur after other screens are displayed. To prevent this afterimage, if the average brightness level does not change for a long time, the number of sustain pulses is reduced. This is an afterimage prevention mode. In addition, the afterimage prevention mode occurs when the average power level is displayed on the screen over a threshold time while the average power level is changed within the average brightness level error range. 6 (a) it is easy to know the relationship between the average brightness level and time. Even if the average brightness level changes within the error range of the average brightness level, it is regarded as approximately the same screen. When such a screen occurs over a threshold time, an afterimage prevention mode occurs. The threshold time referred to herein may be set in consideration of characteristics of the panel, etc. The threshold time according to an embodiment of the present invention may be substantially one minute or more.

6 (b) shows the relationship between the number of sustain pulses or the luminance and the time. As time passes, the average brightness level increases with a constant slope, so that the number of sustain pulses decreases and the brightness decreases. As the average brightness level increases as described above, when the application time of the sustain pulse applied to the scan electrode or the sustain electrode decreases, the sustain period of the reset pulse applied to the scan electrode is extended by the reduced application time of the sustain pulse. A detailed description of the sustain period of the reset pulse applied to the scan electrode by the application time of the sustain pulse is as follows.

FIG. 7 illustrates that the sustain period of the reset pulse applied to the scan electrode is extended by the application time of the sustain pulse according to one embodiment of the present invention.

Referring to FIG. 7, in a subfield in which the application time of the sustain pulse applied to the scan electrode or the sustain electrode is shortened, the sustain period of the reset pulse applied to the scan electrode is extended by the application time of the shortened sustain pulse.

First, (a) shows a general driving pulse for driving the plasma display panel. Detailed description thereof has been described above, and thus will be omitted here.

As the average brightness level increases, the number of sustain pulses decreases as shown in (b) or (c), and the application time of the sustain pulses is shortened. In addition, the sustain period of the reset pulse is extended as the application time of the sustain pulse is shortened. That is, the average brightness level increases when the screen of the plasma display panel that is the same as the threshold time is increased, and the number of sustain pulses decreases as the average brightness level increases. Therefore, the application time of the sustain pulse applied to the scan electrode or the sustain electrode is reduced as the number of the sustain pulses is reduced. The spare time Δt1 and Δt2 is generated by the application time of the sustain pulse reduced in this way, and the sustain period of the reset pulse can be extended due to the spare time Δt1 and Δt2.

In this way, by extending the duration of the reset pulse, the afterimage can be improved through the reset pulse. Therefore, an embodiment of the present invention can improve the prevention of bright afterimage by adjusting the number of sustain pulses, and at the same time, it is possible to extend the retention period of the reset pulse, thereby improving the prevention of dark afterimages. The prevention of afterimages and afterimages can be improved at the same time, making it easier to prevent afterimages.

Further, even if the sustain period of the reset pulse and the application time of the sustain pulse are adjusted, the length of one subfield is hardly changed. Conventionally, when the number of sustain pulses is reduced, no signal is supplied as much as the spare time in which the number of sustain pulses is reduced. However, in one embodiment of the present invention, the length of one subfield may hardly change because the duration of the reset pulse is extended by the spare time. have.

The sustain period of the reset pulse can be extended as long as the application time of the sustain pulse is changed because the magnitude of one sustain pulse supplied during the sustain period can be known.

In addition, the slope of the reset pulse decreases during the sustain period of the extended reset pulse, which will be described in detail later with reference to FIG. 8.

8 illustrates that the slope of the reset pulse becomes smaller during the sustain period of the reset pulse according to an embodiment of the present invention.

Referring to FIG. 8, the reset pulse includes a rising pulse and a falling pulse. Since the description of the rising pulse and the falling pulse has already been sufficiently described, a description thereof will be omitted.

As the extended sustain period of the reset pulse is extended, the slope of the reset pulse becomes smaller toward (a), (b), and (c). As the sustaining period of the reset pulse is extended, the slope of the reset pulse becomes smaller. When the duration of the reset pulse is extended, the slope of the reset pulse is smaller than the slope of the reset pulse when the duration of the reset pulse is not extended. Thus, when the slope of the reset pulse is decreased, the discharge cell initialization may be stable.

In addition, the magnitudes of the maximum and minimum voltages of the reset pulse when the sustain period of the reset pulse is extended are substantially the same as the magnitudes of the maximum and minimum voltages of the reset pulse when the sustain period of the reset pulse is not extended.

Further, since the magnitude of the voltage of the reset pulse when the sustain period of the reset pulse is extended becomes smaller than the magnitude of the voltage of the reset pulse when the sustain period of the reset pulse is not extended, the slope of the reset pulse can be reduced.

Accordingly, since the maximum and minimum voltages of the reset pulses are the same, the smaller the slope of the reset pulses, the weaker discharges are generated, rather than the strong discharges, up to the discharge start voltage, thereby forming stable discharge cell initialization. In addition, since a weak discharge occurs, the background light is reduced, and as a result, the contrast ratio can be improved, the image is clear, and the image quality can be improved.

In addition, the extension sustain period of the reset pulse may be an extended sustain period of at least one of the rising pulse and the falling pulse. Thus, the extended sustain period of the rising pulse and the extended pulse of the falling pulse may be extended at a ratio of about one to one, which is substantially the same ratio. In this way, when the sustaining period of the reset pulse is extended, the sustaining period of the rising pulse and the falling pulse of the reset pulse is sufficiently secured, so that the discharge cell initialization becomes more stable. Therefore, it is possible to effectively reduce the erroneous discharge that can occur when driving the plasma display panel.

According to an embodiment of the present invention, although the ratio of the sustain period in which the rising pulse is extended and the sustain period in which the falling pulse is extended is shown to be extended at a ratio of one to one, the sustain period in which the rising pulse is extended according to the characteristics of the plasma display panel. One to two or two to one ratios of sustain periods in which the overfalling pulses are prolonged are possible.

In the driving method of a plasma display device including a scan electrode and a sustain electrode according to an embodiment of the present invention, as the average brightness level is increased, a subfield whose application time of the sustain pulse applied to the scan electrode or the sustain electrode is shortened In this case, the sustain period of the reset pulse applied to the scan electrode is extended by the application time of the shortened sustain pulse. Since a detailed description thereof is substantially the same as that of the plasma display device, a detailed description thereof will be omitted.

As described above, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features.

Therefore, the embodiments described above are to be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, the plasma display apparatus according to the exemplary embodiment of the present invention has the effect of effectively preventing dark afterimage by changing the application time of the reset pulse.

Claims (10)

A plasma display panel including a scan electrode and a sustain electrode; The driving unit extends the sustain period of the reset pulse applied to the scan electrode in the subfield in which the application time of the sustain pulse applied to the scan electrode or the sustain electrode is shortened as the average brightness level increases. Including, And when the sustain period of the reset pulse is extended, the magnitude of the voltage of the reset pulse becomes smaller than the magnitude of the voltage of the reset pulse when the sustain period of the reset pulse is not extended. The method of claim 1, The reset pulse includes a rising pulse and a falling pulse, And the extended sustain period of the reset pulse is an extended sustain period of at least one of the rising pulse and the falling pulse. The method of claim 1, When the duration of the reset pulse is extended, the magnitudes of the maximum and minimum voltages of the reset pulse are the same as the magnitudes of the maximum and minimum voltages of the reset pulse when the duration of the reset pulse is not extended. Display device. delete The method of claim 1, And when the sustain period of the reset pulse is extended, the slope of the reset pulse is smaller than the slope of the reset pulse when the sustain period of the reset pulse is not extended. In the driving method of a plasma display device including a scan electrode and a sustain electrode, As the average brightness level increases, in the subfield in which the application time of the sustain pulse applied to the scan electrode or the sustain electrode is shortened, in the shortened subfield, the sustain period of the reset pulse applied to the scan electrode is extended. , When the sustain period of the reset pulse is extended, the magnitude of the voltage of the reset pulse is smaller than the magnitude of the voltage of the reset pulse when the sustain period of the reset pulse is not extended. . The method of claim 6, The reset pulse includes a rising pulse and a falling pulse, The extended sustain period of the reset pulse is an extended sustain period of at least one of the rising pulse and the falling pulse. The method of claim 6, When the duration of the reset pulse is extended, the magnitudes of the maximum and minimum voltages of the reset pulse are the same as the magnitudes of the maximum and minimum voltages of the reset pulse when the duration of the reset pulse is not extended. Method of driving a display device. delete The method of claim 6, And when the sustain period of the reset pulse is extended, the slope of the reset pulse is smaller than the slope of the reset pulse when the sustain period of the reset pulse is not extended.

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