KR100570626B1 - Driving apparatus of plasma display panel and driving method thereof - Google Patents

Abstract

The present invention relates to a driving apparatus for a plasma display panel for improving low gray scale expression and a driving method thereof.

According to the present invention, the subfield weight arrangement is applied differently according to the total number of sustain discharge pulses applied to one frame. At this time, the subfield weight arrangement is configured such that the number of sustain discharge pulses allocated to the minimum weight is allocated to one or less.

As a result, the luminance of the light emitted from the subfield having the minimum weight is lower than the luminance of the light emitted by the number of sustain discharge pulses, thereby further improving low gray scale expression.

Low gradation, subfield weights, PDP

Description

A driving device of a plasma display panel and a driving method thereof {DRIVING APPARATUS OF PLASMA DISPLAY PANEL AND DRIVING METHOD THEREOF}

1 is a partial perspective view of a typical AC plasma display panel.

2 shows an electrode arrangement diagram of a typical plasma display panel.

3 is a diagram illustrating a gray scale display method of a plasma display panel.

4 is a diagram showing the number of sustain discharge pulses allocated to each subfield according to the total number of sustain discharges in the conventional plasma display panel.

5 is a diagram illustrating a method for differently setting an arrangement of subfield weights according to the total number of sustain discharge pulses according to an embodiment of the present invention.

FIG. 6 is a diagram showing a specific driving waveform for the case where the number of sustain discharge pulses assigned to the minimum weight is smaller than one. FIG.

7 is a schematic plan view of a plasma display panel according to an embodiment of the present invention.

8 is a diagram illustrating a control unit of a plasma display panel for improving low gray scale expressive power according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving apparatus for a plasma display panel (PDP) and a driving method thereof, and more particularly to a driving apparatus for a plasma display panel for improving low gray scale expressive power and a driving method thereof.

Recently, flat display devices such as a liquid crystal display (LCD), a field emission display (FED), and a plasma display panel have been actively developed. Among these flat panel display devices, the plasma display panel has advantages of higher luminance and luminous efficiency and wider viewing angle than other flat panel display devices. Therefore, the plasma display panel is in the spotlight as a display device to replace a conventional cathode ray tube (CRT) in a large display device of 40 inches or more.

A plasma display panel is a flat panel display device that displays characters or images using plasma generated by gas discharge, and tens to millions or more of pixels are arranged in a matrix form according to their size. The plasma display panel is classified into a direct current type and an alternating current type according to a shape of a driving voltage waveform applied and a structure of a discharge cell.

In the DC plasma display panel, the electrode is exposed without the discharge space insulated, so that the current flows in the discharge space while the voltage is applied, and there is a disadvantage in that a resistance for current limitation must be made. On the other hand, in the AC plasma display panel, since the electrode covers the dielectric layer, the current is limited by the formation of a natural capacitance component, and thus, the electrode is protected from the impact of ions during discharge.

1 is a partial perspective view of an AC plasma display panel.

As shown in FIG. 1, the scan electrode 4 and the sustain electrode 5 covered with the dielectric layer 2 and the protective film 3 on the glass substrate 1 are formed in pairs in parallel. On the glass substrate 6, a plurality of address electrodes 8 covered with the insulator layer 7 are formed. The partition 9 is formed on the insulator layer 7 between the address electrodes 8 in parallel with the address electrode 8, and the phosphor 10 is formed on the surface of the insulator layer 7 and on both sides of the partition 9. Is formed. The glass substrates 1 and 6 are disposed to face each other with the discharge space 11 therebetween so that the scan electrode 4, the address electrode 8, the sustain electrode 5, and the address electrode 8 are orthogonal to each other. The discharge space at the intersection of the scan electrode 4 and the sustain electrode 5 paired with the address electrode 8 forms a discharge cell 12.

2 shows an electrode arrangement diagram of the plasma display panel.

As shown in FIG. 2, the electrodes of the plasma display panel are arranged in a matrix of m × n. Specifically, the address electrodes A1 -Am are arranged in the column direction and n rows of scan electrodes in the row direction ( Y1-Yn and sustain electrodes X1-Xn are arranged in a zigzag. The discharge cell 12 of FIG. 2 corresponds to the discharge cell 12 of FIG.

In general, the driving method of the AC plasma display panel includes a reset period, an addressing period, and a sustain period.

The reset period is a period of initializing the state of each cell in order to perform an addressing operation smoothly on the cell. The addressing period is an address voltage for a cell (addressed cell) turned on to select a cell that is turned on and a cell that is not turned on in a panel. It is a period of time to perform the operation of accumulating wall charge by applying a. The sustain period (hold period) is a period in which a sustain pulse (sustain discharge pulse) is applied to perform discharge for actually displaying an image in the addressed cell.

As shown in FIG. 3, the plasma display panel divides one frame (1TV field) into a plurality of subfields, and time-division control them to implement gray scale. Each subfield consists of the reset period, the addressing period and the sustain period described above. 3 illustrates a case in which one frame is divided into eight subfields to implement 256 gray levels. Each subfield SF1-SF8 consists of a reset period (not shown), an address period A1-A8, and a sustain period S1-S8, and the sustain periods S1-S8 are light emission periods 1T, 2T. , 4T, ..., 128T) becomes 1: 2: 4: 8: 16: 32: 64: 128.

At this time, for example, in order to implement a gray scale of 3, the discharge cell is discharged in the subfield SF1 having the 1T light emission period and the subfield SF2 having the 2T light emission period so that the sum of the discharge periods is 3T. In this manner, 256 grayscale images are displayed by combining subfields having different light emission periods. Here, although each subfield is divided according to the ratio of the sustain periods, and the gray level is expressed by combining them, in practice, the sustain period of each subfield has a different number of sustain discharge pulses (number of sustain pulses) and the number of sustain discharge pulses. The gradation is expressed by the combination of. That is, the gray scale is expressed according to the number of sustain discharge pulses.

On the other hand, the number of sustain discharge pulses allocated to each subfield is allocated by dividing the total number of sustain discharge pulses allocated to one frame by dividing the weight of each subfield at an entire gradation level (for example, 256 gradations). 4 shows the number of sustain discharge pulses allocated in each subfield for the case of 2000, 1000, 500, and 250 total sustain discharge pulses at the 255 gradation level. Here, the reason why the number of sustain discharge pulses is changed is to propose the power consumption by Automatic Power Control (APC). For example, when the total number of sustain discharge pulses is 2000, the number of sustain discharge pulses to which the subfield weight is assigned to 1 is 2000 * 1/255 = 7.84, which is actually 8, and 1000 * when the total number of sustain discharge pulses is 1000. 1/255 = 3.92, which is actually four, and in the same method, the total number of sustain discharge pulses is 1.96 (two) and 0.98 (one) respectively. However, in the case of the number of sustain discharge pulses in which the subfield weight is assigned to 1 as described above, the brightness is too bright to represent a dark screen. Usually, the luminance of one sustain discharge varies depending on the characteristics of the panel, but has a luminance of about 2 to 4 cd / m ² , which is too bright to express low gradation. This causes a problem in that it is difficult to implement colors at low gradation in a PDP in which R, G, and B are mixed to realize colors because the minimum unit light is large.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above-described problems of the related art, and to provide a driving apparatus for a plasma display panel and a driving method thereof for improving low gray scale expression.

A driving method of a plasma display panel according to a feature of the present invention for achieving the above object is

A driving method of a plasma display panel in which a discharge cell is formed by a plurality of first electrodes and a second electrode and a plurality of third electrodes formed to intersect the first electrode and the second electrode.

(a) obtaining the total number of sustain discharge pulses applied to one frame using data of any one frame applied to the plasma display panel;

(b) determining the number of sustain discharge pulses allocated to each subfield by differently applying the subfield weight arrangement according to the total number of sustain discharge pulses obtained in step (a);

(c) driving the first electrode or the second electrode corresponding to the number of sustain discharge pulses allocated to each subfield determined in step (b). Here, the minimum weight in the subfield weight array applied in the step (b) is set such that the number of sustain discharge pulses allocated to the minimum weight is one or less. In addition, the luminance of light emitted by the subfield having the minimum weight in the subfield weight array is characterized by being less than or equal to the luminance of light generated by one sustain discharge pulse. Meanwhile, the minimum weight in the subfield weight arrangement is smaller when the total number of sustain discharge pulses is larger than when the total number of sustain discharge pulses is small.

A driving apparatus of a plasma display panel according to another aspect of the present invention is

An apparatus for driving a plasma display panel in which discharge cells are formed by a plurality of first electrodes and second electrodes and a plurality of third electrodes formed to intersect the first and second electrodes,

An automatic power controller configured to calculate the total number of sustain discharge pulses applied to one frame in response to the image signal data of one frame applied to the plasma display panel;

A sustain discharge pulse number generator for determining the number of sustain discharges allocated to each subfield by differently applying a subfield arrangement according to the total number of sustain discharge pulses calculated by the automatic power controller;

And a scan / sustain driving control section for controlling the first or second electrode to be driven in response to the number of sustain discharge pulses of each subfield determined by the sustain discharge pulse number generator. Here, the number of sustain discharge pulses allocated to the subfield having the minimum weight in the subfield weight arrangement differently applied may be one or less. In the differently applied subfield weight arrangement, the luminance of light emitted by the subfield having the minimum weight is less than the luminance of the light generated by one sustain discharge pulse.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

Now, a driving apparatus for a plasma display and a driving method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a driving method of a plasma display panel for improving low gray scale expressive power will be described with reference to FIGS. 5 and 6. In the method of driving the plasma display panel according to the embodiment of the present invention, the subfield weight array is set differently according to the total number of sustain discharge pulses, and the number of sustain discharge pulses allocated to the subfield having the minimum weight is set to 1 or less. At this time, the luminance according to the number of sustain discharge pulses allocated to the subfield having the minimum weight is set so that light of one sustain discharge or less is output.

5 is a diagram illustrating a method for differently setting an arrangement of subfield weights according to the total number of sustain discharge pulses according to an embodiment of the present invention. In particular, FIG. 5 shows an arrangement of subfield weights and the number of sustain discharge pulses allocated to each subfield in the case where the total number of sustain discharge pulses is 2000, 1000, 500, and 250.

Referring to FIG. 5, when the total number of sustain discharge pulses is 2000, the subfield arrangement is {0.06, 0.125, 0.25, 1, 2, 3, 5, 8, 13, 21, 34, 50, 60, 60} and 1000 In the case of {0.125, 0.25, 0.5, 1, 2, 3, 5, 8, 13, 21, 33, 43, 43, 43, 43, 43}, the subfield weight array is set differently according to the total number of sustain discharge pulses. do. In the case of 500 or 250 total sustain discharge pulses, each subfield weight array is {0.25, 0.5, 1, 2, 3, 5, 8, 13, 21, 33, 43, 43, 43, 43 } And {0.5, 1, 2, 3, 5, 8, 12, 19, 30, 30, 30, 30, 30, 30, 30} to vary the subfield weight arrangement according to the total number of sustain discharge pulses. . At this time, in setting the subfield weight arrangement differently according to the total number of sustain discharge pulses as described above, the minimum weight is set to 0.5-> 0.25-> 0.125-> 0.06 as the total number of sustain discharge pulses is increased. In this manner, the minimum weight is further reduced as the total number of sustain discharge pulses increases, so that the number of sustain discharge pulses allocated to the minimum weight can be set to one or less.

That is, the subfield weight array is set according to the total number of sustain discharge pulses so that each subfield weight value is set differently to correspond to the total number of sustain discharge pulses and the number of sustain discharge pulses assigned to the minimum weight is set to 1 or less. Set it. Accordingly, as shown in FIG. 5, when the total number of sustain discharge pulses is 2000, 1000, 500, and 0.5, the number of sustain discharge pulses assigned to the minimum weight is 0.47, 0.49, 0.49, and 0.49, respectively. Become less. Therefore, the number of sustain discharge pulses assigned to the minimum weight is always set to one or less regardless of the total number of sustain discharge pulses, so that the luminance can be lowered than that caused by one sustain discharge pulse, thereby improving low gradation expression power.

On the other hand, since the number of sustain discharge pulses allocated to the subfield of minimum weight is set to one or less according to the total number of sustain discharge pulses, the number of gray scales that can be expressed when the total number of sustain discharges increases as shown in FIG. 5 increases. . That is, when the total number of sustain discharges increases, the minimum weight and the weight adjacent thereto are further reduced to increase the number of gradations that can be expressed.

In this case, it is preferable in the circuit design that the driving waveform applied to the subfield having the minimum weight is fixed, so that the number of sustain discharge pulses having the minimum weight is set to 0.47, 0.49, 0.49, and 049 almost similarly as shown in FIG. The weight array is set according to the total number of sustain discharge pulses.

Meanwhile, the subfield weights shown in FIG. 5 illustrate an example in which the subfield weight arrangement is changed according to the total number of sustain discharge pulses, and the present invention is not limited to the total number of sustain discharge pulses and the subfield weight arrangement shown in FIG. 5. And a subfield weighting arrangement for setting the number of sustain discharge pulses assigned to the minimum weight according to the total number of sustain discharge pulses to be less than one.

Here, the actual driving waveform for the case where the number of sustain discharge pulses allocated to the minimum weight shown in FIG. 5 is less than or equal to one can be implemented by applying a waveform that rises slowly after the address period without applying the sustain discharge pulse. . That is, the driving waveform should be designed to give a light amount smaller than the light amount generated by one sustain discharge pulse.

FIG. 6 is a diagram showing a specific driving waveform for the case where the number of sustain discharge pulses assigned to the minimum weight is less than one. The driving waveform shown in FIG. 6 is only one example, and the present invention is not limited thereto, and the present invention is not limited thereto, and when the driving waveform is set differently so as to give a smaller amount of light than one sustain discharge pulse, that is, a low sustain discharge pulse voltage is applied or sustain discharge in the sustain period. And a method of floating the electrode after voltage application.

As shown in Fig. 6, a ramp waveform that rises slowly is applied without applying the number of sustain discharge pulses in the sustain period in order to produce an amount of light smaller than one number of sustain discharge pulses. When the scan low voltage Vscl is sequentially applied to the scan electrodes in the address period, the address voltage Va is applied to generate the address light S1 in the selected cell. In the sustain period, a slowly rising ramp voltage is applied to the scan electrode up to the Vy voltage, so that a weak discharge (the resulting amount of light is represented by S2) occurs at a point where the cell selected in the address period exceeds the discharge start voltage. As described above, the minimum weight according to the embodiment of the present invention is obtained through the sum S1 + S2 of the weak light S2 generated by applying the ramp light slowly rising in the sustain period and the address light S1 generated in the address period. Branch implements a subfield. That is, the light amount (for example, the light amount of 0.47, 0.49, 0.49 and 0.49 of the number of sustain discharge pulses shown in FIG. 5) of the minimum weighted subfield having the light amount smaller than the light amount according to the number of sustain discharge pulses is as described above. This is realized through the sum (S1 + S2) of the address light and the weak light generated in the sustain period.

Here, in FIG. 6, only one applying a slowly rising waveform in the sustain period is applied, but a plurality of light may be alternately applied to the scan electrode and the sustain electrode for light for representing a subfield having a minimum weight. Although it is shown that a voltage in the form of a lamp is applied to the scan electrodes, other types of voltages (log waveforms, RC resonance waveforms, etc.) causing weak discharges can be applied.

Hereinafter, referring to FIGS. 7 and 8, a driving apparatus of a plasma display panel implementing a method of differently applying a subfield weight array according to the total number of sustain discharge pulses in order to improve low gray scale expressive power as described above will be described.

7 is a schematic plan view of a plasma display panel according to an embodiment of the present invention.

As shown in FIG. 7, the plasma display panel according to the exemplary embodiment of the present invention includes a plasma panel 100, an address driver 200, a scan / hold driver 300, and a controller 400. Here, the address driving unit 200, the scan / maintenance driving unit 300, and the control unit 400 except the plasma panel 100 are included to form a driving device of the plasma display panel.

The plasma panel 100 includes a plurality of address electrodes A1-Am arranged in the column direction, and a plurality of scan electrodes Y1-Yn and sustain electrodes X1-Xn arranged in a zigzag pattern in the row direction. . The address driver 200 receives an address drive control signal from the controller 400 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode A1-Am. The scan and sustain driver 300 receives a control signal from the controller 400 and alternately inputs a sustain discharge pulse voltage Vs to the scan electrodes Y1-Yn and the sustain electrodes X1-Xn to the discharge cells selected. Perform sustain discharge.

The controller 400 receives R, G, and B image signals and a synchronization signal from the outside, divides one frame into several subfields, and divides each subfield into a reset period, an address period, and a sustain period (sustain period). Drive the panel. At this time, the controller 400 adjusts the number of sustain discharge pulses in each sustain period of the subfield in one frame and supplies the necessary control signals to the address driver 200 and the scan / sustain driver 300. The control unit 400 according to an embodiment of the present invention calculates the total number of sustain discharge pulses used in one frame, and sets the subfield weight array differently as shown in FIG. 5 according to the calculated total number of sustain discharge pulses. At this time, the subfield weight array is set according to the number of sustain discharge pulses so that the number of sustain discharge pulses allocated to the minimum weight is 1 or less.

8 is a diagram illustrating a control unit of a plasma display panel for improving low gray scale expressive power according to an exemplary embodiment of the present invention.

As shown in FIG. 8, the control unit 400 of the plasma display panel according to the embodiment of the present invention includes an inverse gamma correction unit 410, an error diffusion unit 420, and an automatic power control unit (APC) 430. And a sustain discharge pulse number generator 440, a scan / sustain drive controller 450, a subfield generator 460, and a memory controller 470.

The inverse gamma correction unit 410 maps n-bit R, G, and B image input data, which is currently input image data, to an inverse gamma curve and corrects the m-bit (m≥n) image signal. In a typical plasma display panel, n is 8 and m is 10 or 12.

In this case, the image signal input to the inverse gamma correction unit 410 is a digital signal. When an analog image signal is input to the plasma display panel, the analog image signal may be converted into a digital image signal by an analog-to-digital converter (not shown). There is a need. The inverse gamma correction unit 410 may be a logic circuit for generating a lookup table (not shown) or data corresponding to an inverse gamma curve that stores data corresponding to an inverse gamma curve for mapping an image signal. (Not shown).

The error diffusion unit 420 is inversely gamma corrected by the inverse gamma correction unit 410 and error-diffuses the lower m-n bit image of the extended bit m image to surrounding pixels. Error diffusion is a method of displaying an image of a lower bit by separating an image of a lower bit to be diffused into adjacent pixels and a detailed description thereof is described in Korean Patent Laid-Open Publication No. 2002-0014766.

The automatic power controller (APC unit) 470 detects the load ratio using the error spread data output from the error diffusion unit 420 and determines the APC level according to the detected load ratio. At this time, the automatic power control unit 470 transmits the information for calculating the total number of sustain discharge pulses corresponding to the determined APC level to the sustain discharge pulse number generator 440. In this case, the load rate detection method is calculated through an average signal level (ASL) for each frame. When the calculated load ratio is high, the total number of sustain discharge pulses of one frame is reduced to reduce power consumption, and when the load ratio is low, the total number of sustain discharges of one frame is increased to increase luminance.

The sustain discharge pulse number generator 440 allocates the number of sustain discharge pulses to each subfield using the total number of sustain discharge pulses of one frame transmitted from the automatic power control unit 470. Here, the number of sustain discharge pulse generators 440 according to the embodiment of the present invention allocates the number of sustain discharge pulses to each subfield by applying different subfield weight arrays according to the total number of sustain discharge pulses. That is, the sustain discharge pulse number generator 440 corresponds to the total number of sustain discharge pulses transmitted from the automatic power control unit 470 through the information on the subfield weight arrangement according to the total number of sustain discharge pulses stored in advance. The number of sustain discharge pulses applied to each subfield is allocated by applying the subfield weight array. On the other hand, the subfield weight array according to the total number of sustain discharge pulses is stored in the memory (not shown) in advance, and the subfield weight array according to the total number of sustain discharge pulses stored in the memory is arranged as shown in FIG. Have At this time, the number of sustain discharge pulses of the minimum weight allocated by the sustain discharge pulse number generator 440 is set to 1 or less.

The scan / hold controller 450 generates a control signal corresponding to the number of sustain discharge pulses allocated to each subfield output from the sustain discharge pulse number generator 440 and transmits the control signal to the sustain / scan driver 300.

Meanwhile, the subfield generator 430 generates subfield data from the error spread data transmitted from the error spreader 420. Here, in the exemplary embodiment of the present invention, since the subfield weight arrays are set differently according to the total number of sustain discharge pulses in one frame, the subfield generator 430 generates subfield data corresponding to the subfield weight arrays to be applied. . In this case, the information on the subfield weight array to be applied should be transmitted from the sustain discharge pulse number generator 440, and the subfield weight array and the subfield generator 430 applied in the sustain discharge pulse number generator 4400. The subfield weight arrays to be applied must be identical.

The memory controller 470 rearranges the subfield data transmitted from the subfield generator 460 into address data for driving the plasma display panel. At this time, the memory controller 470 separates all the subfields of one frame for each subfield, stores them in the frame memory (not shown in FIG. 5) for each subfield, and stores address data for all pixels for each subfield. The memory is read from the memory and transmitted to the address driver 200.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the present invention, the low gray scale expressing power may be further improved by applying different subfield weighting arrangements according to the total number of sustain discharge pulses allocated to one frame.

Claims (12)

A driving method for driving a plasma display panel in which discharge cells are formed by a plurality of first electrodes and second electrodes and a plurality of third electrodes formed to intersect the first electrode and the second electrode, (a) obtaining the total number of sustain discharge pulses applied to one frame using data of any one frame applied to the plasma display panel; (b) determining the number of sustain discharge pulses allocated to each subfield by differently applying the subfield weight arrangement according to the total number of sustain discharge pulses obtained in step (a); and (c) driving the first electrode or the second electrode corresponding to the number of sustain discharge pulses allocated to each subfield determined in the step (b). The method of claim 1, And the minimum weight in the subfield weight array applied in the step (b) is set so that the number of sustain discharge pulses allocated to the minimum weight is one or less. The method of claim 2, And the number of sustain discharge pulses assigned to the minimum weight is substantially the same even when the total number of sustain discharge pulses is varied. The method according to claim 1 or 2, And the luminance of light emitted by the subfield having the minimum weight in the subfield weight array is equal to or less than the luminance of light generated by one sustain discharge pulse.  The method according to claim 1 or 2, And the minimum weight in the subfield weight arrangement is smaller when the total sustain discharge pulse number is larger than when the total sustain discharge pulse number is small.  The method according to claim 1 or 2, Generating subfield data in response to the arbitrary one frame data corresponding to the subfield weighting arrangement applied in step (b); And applying address data to the third electrode corresponding to the generated subfield data. The method according to claim 1 or 2, The number of gradations that can be expressed according to the subfield weight arrangement applied differently according to the total number of sustain discharges in the step (b) is further increased when the total number of sustain discharges increases. An apparatus for driving a plasma display panel in which discharge cells are formed by a plurality of first electrodes and second electrodes and a plurality of third electrodes formed to intersect the first and second electrodes, An automatic power controller configured to calculate the total number of sustain discharge pulses applied to one frame in response to the image signal data of one frame applied to the plasma display panel; A sustain discharge pulse number generator for determining the number of sustain discharges allocated to each subfield by differently applying a subfield weight array according to the total number of sustain discharge pulses calculated by the automatic power controller; And And a scanning / maintenance driving control unit which controls the first or second electrode to be driven in response to the number of sustain discharge pulses of each subfield determined by the sustain discharge pulse number generator. The method of claim 8, The minimum weight in the applied subfield weight arrangement is a smaller weight when the total number of sustain discharge pulses is larger than that when the total number of sustain discharge pulses is small. The method of claim 8 or 9, And the number of sustain discharge pulses assigned to the subfield having the minimum weight in the subfield weight arrangement differently applied. The method according to claim 8 or 9, And the luminance of light emitted by the subfield having the minimum weight is equal to or less than the luminance of light generated by one sustain discharge pulse. The method according to claim 8 or 9, A subfield generator for generating subfield data in response to the subfield weight array applied by the sustain discharge pulse number generator; And a memory controller configured to generate address data for driving the third electrode from the generated subfield data.

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