JP2002132204A - Driving method for ac type plasma display panel, and ac type plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving method for an AC type plasma display panel by which the reversion of luminance among gray levels is suppressed and to provide the AC type plasma display. SOLUTION: At the time of driving the AC type plasma display panel which is constituted of an address period and a sustenance period, when gray levels is expressed by the sum of luminance of sub-fields to be selected, the mismatching of gray level expression due to luminance saturation is corrected by making the regularity of the selection order of sub-fields of lower bits different in accordance with gray levels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display driving technique, and more particularly to a method of driving an AC type plasma display panel which suppresses the inversion of luminance between gray scales, and an A method.
The present invention relates to a C-type plasma display.

[0002]

2. Description of the Related Art A plasma display panel has a thin structure, no flicker, and a large display contrast ratio.
In addition, it has a number of features, such as a relatively large screen, a fast response speed, a self-luminous type, and multicolor light emission by using a phosphor.

For this reason, in recent years, it has been widely used in the field of computer-related display devices and the field of color image display.

[0004] In such a plasma display, an AC type plasma display panel in which electrodes are covered with a dielectric and indirectly operates in an AC discharge state, and an electrode is exposed to a discharge space and has a DC There is a DC-type plasma display panel that operates in a discharged state.

As the driving method of the AC type plasma display panel, there are a memory operation type using a memory of a discharge cell and a refresh operation type not using the memory.

[0006] The brightness of the plasma display is proportional to the number of discharges, that is, the number of repetitions of the pulse voltage. The above refresh type is mainly used for a plasma display having a small display capacity because the brightness decreases as the display capacity increases.

FIG. 8 is a cross-sectional view illustrating one display cell configuration of a conventional AC plasma display.
The display cell includes a back glass substrate 1 and a front glass substrate 2 made of glass, a transparent scanning electrode 3 and a transparent common electrode 4 formed on the front glass substrate 2, and a scanning electrode for reducing the electrode resistance. A trace electrode 5 and a trace electrode 6 arranged so as to overlap with the common electrode 3 and the common electrode 4, a data electrode 7 formed on the rear glass substrate 1 at right angles to the scanning electrode 3 and the common electrode 4, and a rear glass substrate. A discharge gas space 8 in which a discharge gas made of helium, neon, xenon, or the like or a mixed gas thereof is filled in a space of the front glass substrate 1 and the front glass substrate 2; A partition 9, a phosphor 11 for converting ultraviolet light generated by the discharge of the discharge gas into visible light 10, a dielectric film 12 covering the scan electrode 3 and the common electrode 4, A protective layer 14 made of magnesium oxide to protect the film 12 from the discharge, and includes a dielectric film 13 covering the data electrodes 7.

FIG. 9 schematically shows an electrode arrangement of a conventional AC plasma display panel.
Scan electrodes S1, S2, S3,..., Sn provided in parallel
, Cn, and data electrodes D1, D2, D3 provided in a direction orthogonal to the common electrodes C1, C2, C3,.
The intersections with D4, D5,..., Dm are cells that emit light.
One scan electrode S1, S2, S3,..., Sn, one common electrode, and one data electrode constitute one cell. Therefore, the number of cells in one entire screen is: {scanning electrodes S1, S2, S3,
, Sn and n of the common electrodes C1, C2, C3,.
｝ × ｛data electrodes D1, D2, D3, D4, D5
.., M of Dm} (n × m).

The write selection type driving operation of the AC type plasma display having such a configuration will be described with reference to FIG. FIG. 12 is a timing chart for explaining a write-selection type driving operation of a conventional AC plasma display panel.

Referring to FIG. 12, one frame, which is a time constituting one screen, is divided into a plurality of subfields (hereinafter referred to as S fields).
Each of them may be abbreviated as F), which is composed of four periods: a priming period, an address period, a sustaining period, and a charge erasing period.

First, in the first priming period, a priming pulse Ppr- of the voltage Vp applied to the scan electrode is used.
s, the priming pulse Ppr-c applied to the common electrode side
As a result, a discharge is generated. This discharge generates a priming discharge in a discharge space in the vicinity of the gap between the scan electrode and the common electrode, thereby generating active particles that facilitate the discharge of the cell. Positive wall charges adhere to the top. Subsequently, a charge adjusting pulse Ppe-s is applied to generate a weak discharge, thereby reducing negative wall charges on the scan electrode and positive wall charges on the common electrode.

The address period is a period for selecting a discharge cell to emit light, and includes only a cell selected by a negative scan pulse Psc-s applied to the scan electrode and a positive data pulse Pd applied to the data electrode. A write discharge is generated, and a wall charge is attached to an electrode of a cell at a location where light is emitted in a subsequent sustain period. The write discharge is caused by the scan pulse Psc-s
Is generated only at the intersection of the scanning electrode to which is applied and the data electrode to which the data pulse Pd is applied. When a discharge occurs, wall charges adhere to the discharge cells. On the other hand, in the discharge cells in which no discharge occurs, the wall charges after the charge erasure are small.

The sustain period is a period for display light emission, and is started from the common electrode side, and thereafter, a negative sustain pulse Psus-s is alternately applied to the scan electrode side and the common electrode side.
(Voltage Vs) and a sustain pulse Psus-c are applied to the scan electrode and the common electrode. At this time, since the amount of wall charges of the discharge cells in which writing has not been performed in the address period is very small, no sustain discharge occurs even if a sustain pulse is applied.

On the other hand, in a discharge cell in which a write discharge has occurred in the address period, a positive charge is attached to the scan electrode and a negative charge is attached to the common electrode, and the negative sustain pulse voltage and the wall charge voltage are applied to the common electrode. It is superimposed, exceeds the discharge starting voltage, and discharge occurs. When the discharge occurs, the wall charges are arranged so as to cancel the voltage applied to each electrode. Therefore, negative charges adhere to the common electrode, and positive charges adhere to the scan electrode.

Since the next sustain pulse is a pulse of a positive voltage on the scan electrode side, the effective voltage applied to the discharge space exceeds the discharge start voltage due to the superposition with the wall charges, and a discharge occurs. Hereinafter, the same is repeated to maintain the discharge.
The brightness is determined by the number of times of this discharge repetition.

In the charge erasing period, a sustaining erasing pulse Pse-s having a negative polarity is applied to the scan electrodes to erase wall charges existing when light was emitted in the sustaining period, and to change the state of all discharge cells in the panel. Make uniform.

FIG. 10 is a block diagram of a circuit for operating this sequence. A scanning electrode and a sustain electrode (not shown) are provided at a horizontal end of the plasma display panel, and a drive circuit is connected to the connection. The drive circuit on the scan electrode side is a scan pulse driver for outputting a scan pulse for each scan electrode, a priming driver for outputting a priming pulse, a sustain driver for outputting a sustain pulse, and an erasing pulse. , A scan base driver for outputting a scan base pulse, and a scan voltage driver for outputting a scan voltage, all of which constitute a scan electrode driver.

On the other hand, the drive circuit on the common electrode side is composed of a sustain driver for applying a sustain pulse to the entire common electrode. At the vertical end of the plasma display panel, there is a data electrode take-out portion, and a data driver is connected to this connection portion.

Although each driver is shown as a switch in FIG. 10, it may be constituted by an element typified by a transistor or an FET instead of a physical switch.

The power consumption is extremely increased when the display area of the image is large and the average luminance level is high. Therefore, a control method for suppressing an increase in power consumption has been used. This control method uses PLE (Peak Luminance E).
nhancement).

In the PLE, an input video signal is processed by a video signal processing circuit and a subfield control circuit (SF).
The control circuit converts the signal into a signal for a plasma display. The converted signal is input to an input signal average brightness level calculation circuit, and calculates the brightness level of the entire screen.

The sustain pulse control circuit increases the luminance by increasing the number of sustain pulses when the average luminance level of the input signal is low (when the APL is low), that is, when the display area is small, based on the operation result. Conversely, when the average luminance level is high (when the APL is high), that is, when the display area is large, the number of sustain pulses is reduced to limit the luminance, thereby suppressing power consumption when the display area is large. The number of sustain pulses in each subfield is controlled for each frame so as to obtain a high peak luminance.

The gradation expression is performed by dividing one frame into a plurality of subfields, changing the number of sustain pulses for each subfield, and combining the subfields. Therefore, the ratio of the number of sustain pulses in each subfield is, for example, 1: 2: 4: 8: 16: 32: 64: 128.
Then, 256 (= 2 ⁸ ) gradations can be expressed from those combinations.

[0024]

As described above, in the above-mentioned prior art, when the ratio of the number of sustain pulses in each subfield is set to, for example, 1: 2: 4: 8: 16: 32: 64: 128, those subfields have a ratio of Although 256 (= 2 ⁸ ) gradations can be expressed from the combination, due to the influence of luminance saturation,
It is difficult to express the gradation as calculated.

This luminance saturation will be described below. Generally, the emission of a phosphor is described in JP-A-8-160913. However, electrons in a small amount of impurities called an activator present in the phosphor are converted to a high energy level by absorption of energy from ultraviolet light. Excess energy upon excitation to a lower energy level and then returning to the original lower energy level is emitted as light. Compared to the number of activators before the excitation, the amount of ultraviolet light incident on the phosphor is large, and therefore, when the number of photons of the incident ultraviolet light increases, the visible light output with respect to the incident ultraviolet light amount , And therefore the proportion of the amount of visible light output from the phosphor decreases with an increase in the amount of incident ultraviolet light. This is the luminance saturation of the phosphor.

Even if the number of sustain discharges in each sub-field is set to ²ⁿ times the number of sustain discharges in the sub-field having the unit light emission luminance, the light emission luminance is not smaller than the unit light emission luminance due to the luminance saturation of the phosphor. , ²ⁿ times or less. As a result, the difference between the calculated value and the actually measured luminance increases as the number of sustain pulses increases. Further, the luminance obtained when consecutive subfields are selected may be smaller than the sum of the luminance when a single subfield is selected. This is called inter-subfield luminance saturation, and the shorter the time from the end of the sustain period of one subfield to the sustain period of the next subfield, the greater the degree of saturation is likely to increase.

Therefore, in the above-described conventional driving method of a plasma display, as shown in FIG. 11 (a table for explaining the relationship between the level of APL and the gradation level),
Regardless of the level of the average luminance level (APL) of the input signal, the same coding performs the grayscale levels k, k + 1,
By expressing k + 2 and k + 3, as the number of sustain pulses is increased for higher luminance, the influence of luminance saturation is more likely to occur, and there is a problem that the possibility of inversion of luminance between gradations increases. .

The present invention has been made in view of such a problem, and an object of the present invention is to provide an AC plasma display panel driving method and an AC plasma display which suppress the inversion of luminance between gray levels. The point is to provide.

[0029]

The gist of the present invention is to divide one frame, which is a time constituting one screen, into a plurality of subfields and generate a write discharge in an arbitrary cell. In each subfield to make
An address period in which a scan pulse is applied line-sequentially to a scan electrode and a data pulse synchronized with the scan pulse is applied to a selected data electrode to cause a write discharge in a selected cell to form wall charges, and selectively in an address period. A driving method for an AC type plasma display panel comprising: a sustain period for performing a display discharge for continuously generating a sustain discharge at a location where a discharge occurs, wherein a gray scale is expressed by a sum of luminance of a selected subfield. An AC-type plasma display characterized by correcting the mismatch of gradation expression due to luminance saturation by changing the regularity of the sub-field selection order of the lower bits according to the level of the gradation level. It lies in the method of driving the panel. The gist of the invention described in claim 2 of the present invention is that the regularity of the selected subfield is changed by skipping the gradation level affected by luminance saturation at a high gradation level. A method for driving an AC plasma display panel according to claim 1 is provided. According to a third aspect of the present invention, there is provided a method of driving an AC type plasma display panel according to the second aspect, wherein different coding is used according to the total number of sustain pulses. Exists. The gist of the invention described in claim 4 of the present invention is that the coding that is dynamically different according to the average luminance level of the input signal is used, and the driving of the AC type plasma display panel according to claim 3 is performed. Be in the way. The gist of the invention described in claim 5 of the present invention is that, when many high-order bits are selected to express a high gradation level, the gradation level is skipped by n gradations (n ≧ 1). Accordingly, there is provided a method for driving an AC type plasma display panel according to claim 1, wherein inversion of luminance between gray levels is prevented. The gist of the invention according to claim 6 of the present invention is that the presence or absence of the skip is different depending on the number of the total sustain pulses in one frame. In the driving method. According to a seventh aspect of the present invention, in the AC type plasma display panel according to the fifth aspect, the number of skips varies according to the number of total sustain pulses in one frame. It depends on the driving method. The gist of the invention described in claim 8 of the present invention is that, when combined with a power control method called PLE, the number of sustain pulses is dynamically changed according to the input signal luminance level,
8. The method according to claim 6, wherein the coding is dynamically changed according to the change in the number of sustain pulses.
In the driving method of the AC type plasma display panel described in (1). The gist of the invention described in claim 9 of the present invention is to divide one frame, which is a time constituting one screen, into a plurality of subfields, and to generate a write discharge in an arbitrary cell. Then, a scan pulse is applied to the scan electrode line-sequentially, and a data pulse synchronized with the scan pulse is applied to a selected data electrode to cause a write discharge in a selected cell to form a wall charge. In a case where an AC plasma display is driven by a sustain period in which a sustain discharge is continuously generated at a location where a discharge is generated, and a display period is used, and a gray scale is expressed by a sum of luminances of selected subfields In addition, by changing the regularity of the subfield selection order of the lower bits according to the level of the gradation level, the gradation expression mismatch due to luminance saturation It consists in AC plasma display characterized by having a means for correcting. The gist of the invention described in claim 10 of the present invention is that at a high gradation level, there is provided means for changing the regularity of the selected subfield by skipping a gradation level affected by luminance saturation. An AC-type plasma display according to claim 9, wherein: The gist of the invention according to claim 11 of the present invention resides in an AC type plasma display according to claim 10, wherein different coding is used according to the total number of sustain pulses. According to a twelfth aspect of the present invention,
The gist of the present invention resides in an AC type plasma display according to claim 11, wherein dynamically different coding is used according to an average luminance level of an input signal.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention divides one frame, which is a time constituting one screen, into a plurality of sub-fields (hereinafter, the sub-fields may be abbreviated as SF) and writes and discharges an arbitrary cell. In each subfield, a scan pulse is applied line-sequentially to the scan electrode, and a data pulse synchronized with the scan pulse is applied to the selected data electrode to generate a write discharge in the selected cell to form wall charges in each subfield. And a sustain period for performing a display discharge for continuously generating a sustain discharge at a location where a discharge is selectively generated during the address period. When the gradation is expressed by the sum of the luminances of the subfields, the regularity of the subfield selection order of the lower bits differs depending on the level of the gradation level. By, is characterized in that to correct the misalignment of tone expression by the luminance saturation. Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described.
An embodiment will be described in detail with reference to the drawings. FIG.
FIG. 4 is a table for explaining the first embodiment of the present invention.

The AC type plasma display 200 of the first embodiment (see FIGS. 5 and 6 described later) changes the gray level when a large number of upper bits are selected in order to express a high gray level. By skipping n gradations (n ≧ 1), the inversion of luminance between gradations is prevented.

Referring to FIG. 1, the first embodiment is similar to the first embodiment.
The combination A is the selection of the subfield expressing the gradation level a (selection SF (selected subfield) is indicated by ○), the combination B is the selection of the subfield expressing the gradation level a + 1, and the combination C Is a combination expressing the gradation level a + 2, and the combination D represents the gradation level a + 3. The non-selected subfields are shown in blank.

Here, the gradation level a + m is determined by the combination A
Assuming that (gradation level a) + SF11 (gradation level m), the combination B
+ SF11 is appropriate as the number of sustain pulses.

However, when SF10 and SF11 are selected at the same time, the above-described luminance saturation between subfields causes
The luminance may be lower than the calculated sum. As a result, the luminance of the gradation level a + m ≧ the luminance of the gradation level a + m + 1 may occur. To prevent the brightness from reversing,
To express the gradation level a + m + 1, the combination C
+ SF11 is used. This means that the number of sustain pulses corresponds to the gradation level a + m + 2, but the luminance corresponding to the gradation level a + m + 1 is obtained by the saturation between the sub-fields. This is a state in which the gradation level a + m + 1 is skipped. Similarly, the gradation level a + m + n = combination B
(Gradation level a + 1) + SF11 (gradation level m) + S
Assuming that F12 (gray level n), gray level a + m +
To express n + 1, a combination D (gray level a
+3) + SF11 (gradation level m) + SF12 (gradation level n) subfield selection is used.

Thus, 1 of the gradation level a + m + n + 2
This means that the gradation is skipped. The number of tones to be skipped is increased or decreased according to the degree of luminance saturation, and the number of skips is increased as the gradation level increases with higher luminance saturation. Therefore, in the present embodiment, the skip processing is realized by replacing the coding table without skips with the skipped coding table.

FIG. 2 is a graph showing the relationship between the gradation level and the luminance. The horizontal axis is the gradation level, and the vertical axis is the luminance (unit is [cd
/ M ² ]).

Referring to FIG. 2, the gradation level a + m + 1 in the conventional method is a gradation level in which SF10 and SF11 are successively selected, and the influence of luminance saturation due to continuous subfield selection of upper bits cannot be ignored. On the other hand, for the gradation level a + m, SF9 is selected, SF10 is not selected,
SF11 is selected, and the upper subfields are not continuously selected. Therefore, the luminance is the gradation level a +
m, and the phenomenon of inversion of luminance between gray levels occurs.

Therefore, in this embodiment, the subfield selection corresponding to the gradation level a + m + 2 of the conventional method is used at the gradation level a + m + 1, so that the luminance of the conventional gradation level a + m + 2 is applied to the gradation level a + m + 1. Thus, it is possible to prevent the luminance from being inverted between the gray levels.

FIG. 3 shows the light emission luminance when each subfield is selected. Referring to FIG. 2, the luminance is lower when a continuous subfield is selected than when the single subfield is selected, compared to the sum of the single subfields. This is called inter-field luminance saturation.

Due to the above-described inter-subfield luminance saturation, in the above example, the sustain pulse of one cycle of the gradation level a + m + 1 in which SF10 and SF11 are selected is more than the gradation pulse a + m in which SF9 and SF11 are selected. The brightness is insufficient due to a decrease in the brightness per unit area. Therefore, in the present embodiment, as described above, when the gray scale is expressed by the sum of the luminances of the subfields to be selected, as shown in FIG. By making the order regularity different, there is an effect that the discontinuity of gradation and luminance can be improved.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described.
An embodiment will be described in detail with reference to the drawings. In addition,
The same portions as those already described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. FIG. 4 is a chart for explaining the second embodiment of the present invention.

The second embodiment is characterized in that the presence or absence of skips or the number of skips differs depending on the number of total sustain pulses in one frame in the first embodiment.

Referring to FIG. 4, in the present embodiment, the luminance saturation between subfields becomes more remarkable as the number of sustain pulses increases, so that when the number of sustain pulses is large, the skip number is increased and the number of sustain pulses is small. At the time, the number of skips is reduced (including 0 (zero)).

FIG. 5 is a block diagram showing the operation of the second embodiment. Referring to FIG. 5, in AC plasma display 200 of the present embodiment, input video signal 20 is supplied to video signal processing circuit 22 and subfield control circuit 24 (S
F display circuit) and the plasma display panel 50
Is converted to a signal for

On the other hand, the total sustain pulse number control circuit 26
The total number of sustain pulses in the frame is determined, and coding is determined by the coding control circuit 28. At this time, the coding control circuit 28 determines different coding tables {1, 2,..., N} according to the total number of sustain pulses. 30
From, determine the coding. The coding data is sent to the drive controller 60. In response, the drive controller 60 controls the data signal, the scanning signal,
A common signal is generated, a data signal is provided to the data electrode driver 90, a scan signal is provided to the scan electrode driver 80, and a common signal is provided to the common electrode driver 70.

As described above, according to the second embodiment, different coding control is performed between the case where the total number of sustain pulses is small and the case where the total number of sustain pulses is large. Inversion of the luminance can be prevented.

(Third Embodiment) Hereinafter, a third embodiment of the present invention will be described.
An embodiment will be described in detail with reference to the drawings. In addition,
The same reference numerals are given to the same portions as those already described in each of the above embodiments, and redundant description will be omitted.

The third embodiment is different from the second embodiment in that the PLE (Peak Luminance Enhancem) described above is used.
ent). That is, as shown in FIG. 7, the number of sustain pulses dynamically changes according to the input signal luminance level (APL), and the coding is dynamically changed according to the change.

FIG. 6 is a block diagram of a circuit for performing the operation of the third embodiment. Referring to FIG. 6, in AC plasma display 200 of the present embodiment, after performing image processing, average luminance level calculating circuit 110 performs AP processing.
L (average luminance level of input signal) is calculated, and when APL (average luminance level of input signal) is high, sustain pulse control circuit 100 determines a small number of total sustain pulses and coding control circuit 28 determines coding table # 1. ,
A coding with a small number of skips is selected from 2,..., N｝ 30. After the coding is determined, the sustain pulse control circuit 100 determines the number of sustain pulses for each subfield. If the average luminance level (APL) of the input signal is low,
Sustain pulse control circuit 100 determines a large total number of sustain pulses, and coding control circuit 28 selects a coding with a large skip number from coding tables {1, 2,..., N} 30. After the coding is determined, the sustain pulse control circuit 100 determines the number of sustain pulses for each subfield.

As described above, according to the third embodiment, by using different coding depending on the APL of the video signal 20, it is possible to prevent the inversion of the inter-gray-scale luminance regardless of the level of the APL. Can be.

It should be noted that the present invention is not limited to the above embodiments, and it is clear that the above embodiments can be appropriately modified within the scope of the technical idea of the present invention. Further, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiments, and can be set to numbers, positions, shapes, and the like suitable for carrying out the present invention. In each drawing, the same components are denoted by the same reference numerals.

[0053]

As described above, the present invention is constructed as described above. When the gradation is expressed by the sum of the luminances of the subfields to be selected, the order of the subfield selection of the lower bits depends on the level of the gradation level. By making the regularity different,
There is an effect that discontinuity of gradation and luminance can be improved.

[Brief description of the drawings]

FIG. 1 is a table for explaining a first embodiment of the present invention.

FIG. 2 is a graph showing a relationship between a gradation level and luminance.

FIG. 3 is a table showing light emission luminance when each subfield is selected.

FIG. 4 is a table for explaining a second embodiment of the present invention.

FIG. 5 is a block diagram of a circuit for operating the sequence according to the second embodiment.

FIG. 6 is a block diagram of a circuit for operating a sequence according to the third embodiment of the present invention.

FIG. 7 is a chart for explaining a third embodiment;

FIG. 8 is a cross-sectional view illustrating one display cell configuration of a conventional AC plasma display.

FIG. 9 is a schematic view of an electrode arrangement of a conventional AC plasma display panel.

FIG. 10 is a block diagram of a circuit for operating a sequence of a conventional AC plasma display panel.

FIG. 11 is a table for explaining the relationship between the level of APL and the gradation level.

FIG. 12 is a timing chart for explaining a write-selection type driving operation of a conventional AC plasma display panel.

[Explanation of symbols]

 Reference Signs List 20 video signal 22 video signal processing circuit 24 subfield control circuit 26 total sustain pulse number control circuit 28 coding control circuit 30 coding table {1, 2, ..., n} 40 video processing unit 50 plasma Display panel 60 Drive controller 70 Common electrode driver 80 Scan electrode driver 90 Data electrode driver 100 Sustain pulse control circuit 110 Average luminance level operation circuit 200 AC plasma display

Claims (12)

[Claims] 1. A frame constituting one screen is divided into a plurality of sub-fields, and a scanning pulse is applied to a scanning electrode line-sequentially in each sub-field in each sub-field in order to generate a writing discharge in an arbitrary cell. An address period in which a data pulse synchronized with a scan pulse is applied to a selected data electrode while applying the voltage to cause a write discharge in a selected cell to form a wall charge, and a sustain discharge is generated in a location where a discharge is selectively generated in the address period. A method of driving an AC plasma display panel comprising a sustain period for performing a display discharge to be continuously generated, wherein a gradation level is expressed by a sum of luminances of selected subfields. By correcting the regularity of the subfield selection order of the lower bits according to the The driving method of AC plasma display panel according to symptoms. 2. The AC-type plasma display panel according to claim 1, wherein at a high gradation level, the regularity of the selected subfield is changed by skipping a gradation level affected by luminance saturation. Drive method. 3. The method of driving an AC plasma display panel according to claim 2, wherein different coding is used according to the total number of sustain pulses. 4. The method according to claim 3, wherein different coding is dynamically used according to the average luminance level of the input signal. 5. When the number of high-order bits is selected to express a high gradation level, the gradation level is skipped by n gradations (n ≧ 1), thereby preventing inversion of the luminance between gradations. 2. The method of driving an AC plasma display panel according to claim 1, wherein: 6. The driving method of an AC type plasma display panel according to claim 5, wherein the presence or absence of the skip differs depending on the number of the total sustain pulses in one frame. 7. The method of driving an AC plasma display panel according to claim 5, wherein the number of skips varies according to the number of total sustain pulses in one frame. 8. When combined with a power control method called PLE, the number of sustain pulses is dynamically changed according to the input signal luminance level, and the coding is dynamically changed according to the change in the number of sustain pulses. The method for driving an AC plasma display panel according to claim 6 or 7, wherein: 9. A frame constituting one screen is divided into a plurality of subfields, and a scanning pulse is applied to a scanning electrode line-sequentially in each subfield in order to generate a writing discharge in an arbitrary cell. An address period in which a data pulse synchronized with a scan pulse is applied to a selected data electrode while applying the voltage to cause a write discharge in a selected cell to form a wall charge, and a sustain discharge is generated in a location where a discharge is selectively generated in the address period. An AC-type plasma display driven by a sustain period for performing a display discharge to be continuously generated, wherein when a gray scale is expressed by a sum of luminances of selected subfields, according to a level of a gray scale level, A feature is provided that corrects the inconsistency of gradation expression due to luminance saturation by making the regularity of the subfield selection order of lower bits different. AC type plasma display to be. 10. The AC type according to claim 9, further comprising means for changing the regularity of the selected subfield by skipping a gray level affected by luminance saturation at a high gray level. Plasma display. 11. The method according to claim 10, wherein different coding is used according to the total number of sustain pulses.
The AC-type plasma display according to 1. 12. The AC-type plasma display according to claim 11, wherein dynamically different coding is used according to the average luminance level of the input signal.