JP2001013915A - Driving method of plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably conduct a writing operation of a display line, in which a writing becomes weak, and to prevent the deterioration in picture quality by varying the potential of an X electrode in a writing interval during an odd numbered line scanning and an even numbered line scanning. SOLUTION: The applied voltage of an X electrode during even numbered line scanning in the latter half of a writing period is set to a value (Vc) which is higher than the applied voltage of the X electrode during odd numbered line scanning in the front half of the writing period. Note that the scanning of odd and even numbered lines is divided into the front half and the latter half of a writing period. By making the potential of the X electrode to be higher than the Y electrode and an address electrode during the latter half of a wiring period, the reduced portion of the potential of the X electrode caused by the wall electric charges formed on an even numbered line X electrode by maldischarging is compensated for the address discharging is stably conducted during even numbered line scanning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for driving a surface discharge AC type plasma display panel.

[0002]

2. Description of the Related Art FIG. 5 shows a schematic configuration of a conventional AC type and surface discharge type plasma display panel. On one of the opposing glass substrates, sustain electrodes X1 to X4 are formed in parallel with each other at an equal pitch, and scanning electrodes Y1 to
Y4 are formed in pairs in parallel, and the gap between the non-display lines is made wider than the gap between the display lines to prevent erroneous discharge to adjacent display lines.
Address electrodes A1 to A6 are formed on the other glass substrate at right angles to these electrodes, and the upper portions thereof are covered with a phosphor.
To 7 are arranged.

The driving method of this plasma display is as follows.
This will be described with reference to FIGS. The gradation display of the plasma display uses a subfield driving method in which one field is divided into a plurality of subfields and driving is performed. FIG. 4 shows one field as subfield SF1.
This is an example of a subfield driving method in which the image is divided into eight to SF8 and gradation display is performed. The luminance of each subfield is weighted by the power of 2 n, and an arbitrary gradation display can be obtained by combining appropriate subfields.

In this method, each subfield is divided into a writing period, a sustaining period, and an erasing period. FIG.
Is an example of a drive timing chart in one subfield.

In the writing period, all the sustain electrodes hold a constant DC voltage, and apply an address pulse applied according to display data to the address electrode and a scan pulse having a phase opposite to the address pulse to the scan electrode. ,
A first write discharge is generated between the scan electrode and the address electrode, and at the same time, the discharge is used as a trigger to cause a second write discharge between the scan electrode and the sustain electrode, thereby forming wall charges necessary for the sustain discharge. Hereinafter, the first write discharge and the second write discharge are collectively referred to as an address discharge.

In the sustain period, the sustain discharge is continued by applying an AC sustain pulse to the scan electrode and the sustain electrode in accordance with the wall charges written in the write period, thereby performing light emission display. Also, by changing the number of times of the sustain discharge for each subfield, the luminance weighting of each subfield is determined.

In the erasing period, an erasing pulse is applied to all the sustain electrodes to cause an erasing discharge to stop the discharge.

[0008] As a method of driving a plasma display in which the above-mentioned problems of the driving method are improved, Japanese Patent Laid-Open No.
In Japanese Patent No. 39834, an erroneous write between display discharge pixels is performed by changing a scan order so as to avoid a temporally continuous generation of a write discharge generated during a write period by scanning a scan electrode. There has been proposed a driving method for eliminating an address discharge and avoiding erroneous lighting which has hindered high definition and high brightness of a plasma display.

FIG. 7 shows an example of a driving timing chart of this plasma display. In this example, scanning is performed first on odd-numbered scanning electrodes Y1, Y3,..., And then scanning is performed on even-numbered scanning electrodes Y2, Y4,. With such a driving method, the adjacent pixels are not continuously scanned, and the charged particles that have moved to the adjacent pixels are attenuated by recombination due to dispersion and movement of the charged particles generated by the writing discharge. , Erroneous writing discharge does not occur,
It is possible to prevent erroneous lighting of adjacent pixels, which has been a problem in the conventional method.

On the other hand, a plasma display panel as shown in FIG. 8 and its drive as shown in FIG. 8 are used as a plasma display apparatus in which display lines are provided between all the sustain electrodes and the scan electrodes by an interlaced scanning method for the purpose of increasing the definition of the panel. A method has been proposed (JP-A-9-160).
525).

FIG. 8 is a schematic diagram showing the structure of the plasma display panel, in which sustain electrodes X1 to X5 and scan electrodes Y1 are arranged.
Y4 are arranged in parallel with each other, and all the electrodes are arranged at an equal pitch in order to make a display line between all the electrodes. Further, partition walls are provided between the address electrodes A1 to A6, respectively.

FIGS. 9 and 10 show drive timing charts of the above-described plasma display. During the writing period of the odd field, as shown in FIG. 9, the voltage waveforms supplied to the odd X electrodes are the same, the voltage waveforms supplied to the even X electrodes are the same, and the selected odd Y electrode has The opposite-phase scan pulse synchronized with the pulse voltage of the adjacent odd-numbered X electrode is supplied. The even-numbered Y electrode is supplied with the opposite-phase scan pulse synchronized with the pulse voltage of the adjacent even-numbered X electrode. Writing is performed.

In the writing period of the even field, FIG.
, The voltage waveforms supplied to the odd X electrodes are the same as each other, the voltage waveforms supplied to the even X electrodes are the same as each other, and the pulse voltage of the adjacent even X electrode is connected to the selected odd Y electrode. The scanning pulse of the opposite phase synchronized with the pulse is supplied to the even-numbered Y electrode, and the scanning pulse of the opposite phase synchronized with the pulse voltage of the adjacent odd-numbered X electrode is supplied to the even-numbered Y electrode to write the even-numbered line.

In the sustain period of each field, an AC sustaining pulse is supplied to the odd-numbered line and the even-numbered line so that the phases thereof are opposite to each other, thereby performing light emission display.

Further, as an improved method of this driving method, a driving method as shown in timing charts of FIGS. 11 and 12 has been proposed. In this driving method, the odd-numbered lines and the even-numbered lines are divided into two odd-numbered and even-numbered display line groups, and in each field, one of the two display line groups is scanned in the first half of the writing period. Is performed in the latter half of the writing period.

By performing such scanning, one wide pulse may be supplied to each of the odd-numbered group and the even-numbered group of the sustain electrodes during the writing period of each of the odd field and the even field. Therefore, power consumption can be reduced as compared with the case where a pulse is supplied to one of these groups for each scan of the scan electrode, and the configuration of the electrode drive circuit is simplified.

[0017]

However, in the above-described conventional method of driving a plasma display panel, when the scanning order is changed so as to avoid temporally continuous generation in adjacent pixels, a display line that is skipped is not obtained. The address discharge at the time becomes weaker. In the above-described example, the skipped display lines are even-numbered lines, and as a result, there is a problem that the luminescent display of the display lines flickers or the lines appear dark.

Further, in the above-described interlaced scanning type plasma display, a similar problem occurs when the driving method shown in FIGS. 11 and 12 is used.
In this case, in each of the odd field and the even field, the light emission display of the display line scanned in the latter half of the writing period becomes unstable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a method of driving a plasma display panel capable of stably performing a writing operation on a display line where writing is weak and preventing deterioration in image quality. I do.

[0020]

In order to achieve this object, the present invention provides an electrode pair formed by arranging an X electrode and a Y electrode on a substrate in parallel with each other, and is arranged so as to be separated from and opposed to the substrate. A plurality of address electrodes are arranged orthogonally to the X electrodes and the Y electrodes on another substrate, and writing of display data is performed by forming wall charges necessary for sustain discharge according to the display data, and In the writing period, first, one of the odd line and the even line is scanned, and then the other is scanned. In the driving method of the plasma display panel, the potential of the X electrode with respect to the potential of the Y electrode and the address electrode in the writing period is changed to the odd line. It is characterized in that it is changed during scanning and even line scanning.

According to the present invention, the electrodes X1 to Xn + 1 are arranged on the substrate in this order in parallel with each other, and the electrode Yi is arranged between the electrodes Xi and Xi + 1 when i = 1 to n. The electrodes X1 to Xn are attached to another substrate which is spaced apart from and opposed to the substrate.
+1 and a plurality of address electrodes orthogonal to the electrodes Y1 to Yn are arranged, writing of display data is performed by forming wall charges necessary for sustain discharge according to the display data, and further, interlaced scanning is performed. In the odd field, light emission display is performed between the electrode Yi and the electrode Xi, and in the even field, light emission display is performed between the electrode Yi and the electrode Xi + 1, and during a writing period in each field. The scanning order is a method of driving a plasma display panel in which one of odd-numbered display lines and even-numbered display lines is scanned first, and then the other is scanned. In the scanning of the second display line, the potential of the X electrode is changed with respect to the potential of the Y electrode and the address electrode.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A driving method of a plasma display panel according to the present invention uses a driving method in which one of an odd line and an even line is scanned in the first half of a writing period and the other is scanned in the latter half of the writing period. By increasing the voltage applied to the sustain electrodes in the second half, the internal voltage dropped by extra wall charges due to erroneous discharge in the first half of the writing period can be recovered, and writing in the second half of the writing period can be performed stably.

Further, according to the present invention, in a plasma display panel in which the display lines are provided between all the electrodes in the interlaced scanning system, one of the odd-numbered display lines and the even-numbered display lines is first used in both the odd and even fields. The present invention is also applicable to a case where a driving method of scanning and subsequently scanning the other is used.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A driving method of a plasma display panel according to an embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) When a driving method as shown in the driving timing chart of FIG. 7 is used in a plasma display panel having a conventional configuration as shown in FIG. 5, an odd line scanning in the first half of the writing period is performed. At the time of the address discharge, an erroneous discharge occurs to the adjacent even-numbered cell, thereby weakening the address discharge at the time of scanning the even-numbered line. This erroneous discharge will be described below.

FIG. 13 shows one example of the case where the driving method of FIG. 7 is applied to a plasma display panel having a conventional configuration.
The outline of the address discharge of the odd line Lo between the scan electrode Yo and the sustain electrode Xo in the first half of the writing period is shown for the odd o and even e between n and n.

As described above, in the writing period, first, a first writing discharge occurs between the address electrode and the scanning electrode Yo as shown in (1) of FIG. 2), a second write discharge occurs between the scan electrode Yo and the sustain electrode Xo.

However, since the first write discharge spreads toward the address electrode and spreads along the address electrode, the first write discharge develops during the first write discharge as shown in FIG.
3, the X of the adjacent display line on the Y electrode side
It is considered that erroneous discharge to the electrode Xe occurs.

As a result, the address discharge during the scanning of the even line Le in the latter half of the writing period following the scanning of the odd line Lo in the first half of the writing period becomes unstable. This is because, due to the erroneous discharge, the scan electrodes Y are applied to the sustain electrodes Xe of the even lines.
Wall charges are formed so as to reduce the potential of the sustain electrode Xe with respect to the potentials of the e and address electrodes, and the voltage between the scan electrode Ye and the sustain electrode Xe on the even-numbered line is reduced. This is presumably because the write discharge is weaker than during odd-line scanning.

FIG. 1 is a driving timing chart showing a driving method according to the first embodiment of the present invention. As shown in FIG. 1, the applied voltage of the X electrode during even line scanning in the latter half of the writing period is set to a value (Vc) higher than the applied voltage of the X electrode during the first half of the writing period during odd line scanning.

As described above, when scanning the odd-numbered line and the even-numbered line separately in the first half and the second half of the writing period, the potential of the X electrode with respect to the Y electrode and the address electrode is increased in the second half of the writing period. This makes it possible to compensate for the decrease in the potential of the X electrode due to the wall charges formed on the X electrode of the even line due to the erroneous discharge described above, and to stably generate the address discharge during scanning of the even line. Become.

(Embodiment 2) Next, an interlaced scanning type plasma display panel shown in FIG.
An erroneous discharge when the driving method shown in the driving timing chart of FIG. 12 is applied will be described below.

The state of the address discharge in the above-mentioned driving method is as follows. For example, in the odd field, in FIG. 13, the lengths of the gaps a and b between the electrodes are the same, and the odd line and the even line are scanned in the odd field, respectively. Of the display lines corresponding to the odd-numbered display lines and the even-numbered display lines. The non-display lines in the odd fields correspond to the display lines in the even fields.

Considering the above, for the same reason as in the first embodiment described above, even in the interlaced scanning type plasma display panel as shown in FIG. 8, erroneous discharge occurs in the address discharge in the first half of the writing period. Occurs,
The address discharge of the even-numbered display lines scanned in the latter half of the writing period becomes unstable.

Further, since the lengths of the gaps a and b between the electrodes are the same, the possibility of occurrence of the erroneous discharge is higher than in the first embodiment. The same is true for even fields.

FIGS. 2 and 3 are driving timing charts showing a driving method according to the second embodiment of the present invention. In this embodiment, as in the first embodiment, in the plasma display panel of the interlaced scanning system, FIGS.
2 is applied to the sustain electrode X of the display line scanned in the latter half of the writing period, the applied voltage Vx in the first half of the writing period.
By applying a higher voltage Vy, stabilization of the address discharge can be realized.

[0037]

As described above, according to the present invention, in the scanning of the display line, when the interlaced scanning is performed every other line in the first half and the second half of the writing period, the scanning is performed in the second half of the writing period. By setting the voltage of the sustain electrode of the displayed display line to a value different from the voltage of the sustain electrode of the display line scanned in the first half, the address discharge in the latter half of the writing period can be stably performed. .

[Brief description of the drawings]

FIG. 1 is a drive timing chart of a plasma display panel according to a first embodiment of the present invention.

FIG. 2 is a drive timing chart in an odd field of an interlaced scanning type plasma display panel according to a second embodiment of the present invention;

FIG. 3 is a drive timing chart in an even field of an interlaced scanning type plasma display panel according to a second embodiment of the present invention.

FIG. 4 is a driving timing chart showing a subfield driving method of a color plasma display.

FIG. 5 is a schematic configuration diagram of a conventional plasma display panel.

FIG. 6 is a drive timing diagram of a plasma display panel having a conventional configuration.

FIG. 7 is a drive timing diagram when scanning is performed by dividing odd lines and even lines in a plasma display panel having a conventional configuration.

FIG. 8 is a schematic configuration diagram of an interlaced scanning type plasma display panel.

FIG. 9 is a drive timing diagram in an odd field of an interlaced scanning type plasma display panel.

FIG. 10 is a drive timing chart in an even field of an interlaced scanning type plasma display panel.

FIG. 11 is a drive timing diagram when scanning is performed separately in odd-numbered display lines and even-numbered display lines in an odd field of an interlaced scanning plasma display panel.

FIG. 12 is a drive timing diagram when scanning is performed separately in odd-numbered display lines and even-numbered display lines in an even-numbered field of an interlaced scanning type plasma display panel.

FIG. 13 is a diagram showing a state of an address discharge when scanning is performed by dividing odd lines and even lines in a plasma display panel having a conventional configuration.

[Explanation of symbols]

 1-7 partition A1-A6 address electrode L1-L8 display line X1-X5 sustain electrode Y1-Y5 scan electrode

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/288 G09G 3/28 B

Claims (2)

[Claims] An X-electrode and a Y-electrode are arranged on a substrate in parallel with each other to form an electrode pair, and a plurality of address electrodes are formed on another substrate facing the substrate so as to be orthogonal to the X-electrode and the Y-electrode. Is arranged, writing of display data is performed by forming wall charges necessary for sustain discharge according to the display data, and during a writing period, first, one of an odd line and an even line is scanned. A plasma display panel driving method for scanning the other by scanning the other electrode, wherein the potential of the X electrode with respect to the potential of the Y electrode and the address electrode during a writing period is changed between an odd line scan and an even line scan. Driving method for a plasma display panel. 2. An electrode X1 to Xn + 1 is arranged on a substrate in this order in parallel with each other, and an electrode Yi is arranged between the electrodes Xi and Xi + 1 when i = 1 to n, and is opposed to the substrate. A plurality of address electrodes are arranged orthogonally to the electrodes X1 to Xn + 1 and the electrodes Y1 to Yn on another arranged substrate, and writing of display data is performed according to a wall necessary for sustain discharge according to the display data. This is performed by forming electric charges, and further, by performing interlaced scanning, and in odd fields, the electrodes Yi−
A light-emitting display is performed between the electrodes Xi, and in an even field, a light-emitting display is performed between the electrode Yi and the electrode Xi + 1.
Further, as a scanning order in a writing period in each field, a driving method of a plasma display panel that first scans one of odd-numbered and even-numbered display lines, and then scans the other, in the writing period of each field. A method of driving a plasma display panel, wherein the potential of an X electrode with respect to the potential of a Y electrode and the address electrode is changed during scanning of odd-numbered display lines and scanning of even-numbered display lines.