JP2701725B2 - Driving method of plasma display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a plasma display, and more particularly to a method for driving an AC discharge memory type plasma display.

[0002]

2. Description of the Related Art Generally, a plasma display panel (hereinafter abbreviated as PDP) has a thin structure, has no flicker, has a large display contrast ratio, and can have a relatively large screen, and has a response speed. It has a number of features, such as being fast, self-luminous, and capable of emitting multicolor light 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.

[0003] The PDP has an AC discharge type in which electrodes are covered with a dielectric material and is indirectly operated in an AC discharge state depending on the operation method, and a PDP in which the electrodes are exposed to a discharge space and are in a DC discharge state. There is a DC discharge type operated by the above. Further, the AC discharge type includes a memory operation type using a memory of a discharge cell as a driving method and a refresh operation type not using the memory. The brightness of the PDP is proportional to the number of discharges, that is, the number of repetitions of the pulse voltage.
The refresh type described above is mainly used for a PDP having a small display capacity because the brightness decreases as the display capacity increases.

FIG. 13 shows an AC discharge memory operation type PDP.
FIG. 3 is a cross-sectional view illustrating a configuration of one display cell. As shown in FIG. 13, this display cell includes two insulating substrates 19 and 13 made of glass, front and back, and a scan electrode 11 and a sustain electrode 14 formed on the insulating substrate 13.
Scan electrode 11 and sustain electrode 1 on insulating substrate 19.
4 and the data electrode 18 formed orthogonal to the insulating substrate 1
A discharge gas space 12 in which spaces 3 and 19 are filled with a discharge gas made of helium, neon, xenon, or the like, or a mixed gas thereof, and a partition wall 9 for securing the discharge gas space 12 and separating display cells. A phosphor 16 for converting ultraviolet light generated by the discharge of the discharge gas into visible light, a dielectric 10 covering the scan electrode 11 and the sustain electrode 14, and a protection made of magnesium oxide or the like for protecting the dielectric 10 from discharge. Layer 15 and data electrode 18
And a dielectric 17 that covers the surface.

Next, the discharging operation of the selected display cell will be described with reference to FIG. When a pulse voltage exceeding the discharge threshold, that is, a data pulse, is applied between the scan electrode 11 and the data electrode 18 to start discharge, positive and negative charges on both sides correspond to the polarity of the data pulse. It is attracted to the surfaces of the dielectrics 10 and 17 causing a charge buildup. Since the equivalent internal voltage or wall voltage resulting from the accumulation of the charges has the opposite polarity to the voltage of the data pulse, the effective voltage inside the cell decreases as the discharge grows, and the data voltage increases. -Even if the voltage of the pulse maintains a constant value, the discharge cannot be maintained and finally stops. After this, the adjacent scan electrode 11 and sustain electrode 14
When a sustain pulse, which is a pulse voltage having the same polarity as the wall voltage, is applied during the period, the wall voltage is superimposed as an effective voltage. It can discharge beyond the threshold. Therefore, the above-described discharge can be maintained by continuously applying the above-described sustain pulse between the scan electrode 11 and the sustain electrode 14. This function is the above-mentioned memory function. Further, the discharge can be stopped by applying an erasing pulse, which is a low-voltage pulse voltage having a magnitude and width to neutralize the wall voltage, to the scan electrode 11 or the sustain electrode 14. .

FIG. 12 shows a conventional AC discharge memory operation type P
FIG. 4 is a diagram showing an electrode arrangement of a DP, and corresponds to an electrode arrangement of a PDP 7b for dot matrix display, and corresponds to a display cell 8;
b are arranged in a matrix of j × k rows and columns. As shown in FIG. 12, the PDP 7b
Are scanning electrodes Sc1, Sc arranged in parallel with each other.
2,. . . . , Scj and sustain electrodes Su1, Su
2,. . . , Suj, and data electrodes D1, D arranged orthogonally to these scan electrodes and sustain electrodes.
2,. . . , Dk. Here, a PDP capable of color display can be obtained by separately applying the phosphor 16 shown in FIG. 13 into three colors of RGB.

FIGS. 15 (a), (b), (c), (d),
(E) and (f) are timing diagrams showing an example of a drive voltage waveform in the PDP 7b, and show sustain electrodes Su1,
Su2,. . . . , Suj, and the common sustain electrode drive waveform COM, and the scan electrodes Sc1, Sc2, Sc3,
And Scj, scan electrode drive waveforms S1, S2, S3 and Sj respectively applied to data electrode Di (1 ≦ 1).
(i ≦ k) is applied to the data electrode drive waveform DATA.

FIG. 14 is a schematic diagram showing one cycle of the drive timing of the conventional example. One cycle of the drive includes a pre-discharge period (1-6), a pre-discharge erase period (2-6),
The write discharge period (3-6) and the sustain discharge period (4-
6). The pre-discharge period (1-6) and the pre-discharge erase period (2-6) correspond to the write discharge period (3--6).
In order to obtain stable write discharge characteristics in 6),
This is a period for generating active particles and wall charges in the discharge gas space 10, and discharge and erasure are simultaneously performed in all display cells of the PDP 7b. During the write discharge period (3-6), the scan electrodes Sc1, Sc2,. . . , Sc
The scan pulse 3b is applied to each j at a timing independently and sequentially, and the writing discharge is performed line-sequentially. In order to write to the first i-th display cell 8b, the data pulse 6b is applied to the drive waveform S
The discharge is generated between the scan electrode Sc1 and the data electrode Di by applying the scan pulse 3b in synchronization with the timing of one scan pulse 3b. When writing is not performed on the display cell 8b, no data pulse is applied. The sustain discharge period (4-6) is a period in which the display cells that have undergone the address discharge during the address discharge period are sustain-discharged under the above-described memory function, and are sustained by the sustain pulses 4b and 5b.
The discharge is repeated between the scan electrode and the sustain electrode, and the lighting is continued. When the erase pulse is applied to the scan electrode, the discharge is stopped and the light is turned off.

[0009]

Problems to be Solved by the Invention
In a panel having about this many scanning lines or a panel of low gradation display, a sufficiently long scanning pulse width of several μS or more can be obtained, and a stable display operation has been obtained. However, PDPs, which have been increasingly required in the market as flat-panel video display devices, have a large full-color display capacity of 500 to 1000 scanning lines. In order to drive this PDP, it is necessary to perform a high-speed write operation with a data pulse width of about 1 to 3 μS. However, in the conventional drive method, the amount of active particles and wall charges, which are seeds of discharge, is insufficient, and the write voltage is reduced. , And a reliable writing operation could not be performed, and good display could not be realized.

[0010]

According to a first aspect of the present invention, there is provided a method of driving a plasma display, comprising: a scan comprising M (positive integer) scan electrodes corresponding to scan lines of a display cell formed on the same plane. An electrode group, and a sustain electrode group consisting of M sustain electrodes functioning for sustaining the discharge of the display cell, and orthogonal to the scan electrode group and the sustain electrode group;
In an AC discharge memory type plasma display panel including a plurality of data electrodes driven by receiving predetermined display data, N (an integer of 2 or more) sets of scan electrodes formed by dividing the value of M for each block of the group and sustain electrode group has a period of the write discharge to be priming discharge erasing period and sequentially scans that are collectively and simultaneously duration of the preliminary discharge, at least every said block
Is the pre-discharge erasing period of another block
The time is shifted from the
Write the same block as the last period and its pre-discharge erase period
And a discharge period .

A driving method of a plasma display according to a second aspect of the present invention is the driving method according to the first aspect, wherein the N scanning electrode groups and the sustain electrode groups formed by dividing the numerical value of M are used. n (positive integer: 1 ≦ n ≦ N)
The pre-discharge period and the pre-discharge erase period of the n-th block do not overlap with the write discharge periods of the scan electrode group and the sustain electrode group other than the n-th block.

According to a third aspect of the present invention, there is provided a driving method of a plasma display according to the first aspect.
The n-th (positive integer: 1 <n ≦ ) N scan electrode group and sustain electrode group formed by dividing the numerical value of M
The pre-discharge period and the pre-discharge erase period of the N ) -th block overlap with the write discharge periods of the scan electrode group and the sustain electrode group other than the n-th block.

According to a fourth aspect of the present invention, in the driving method of the first aspect, in the driving method according to the first aspect, the N scanning electrode groups and sustain electrode groups formed by dividing the numerical value of M are used. n (positive integer: 1 <n ≦ N )
The pre-discharge period of the n-th block does not overlap with the write discharge periods of the scan electrode groups other than the n-th and sustain electrode groups,
In addition, the pre-discharge erasing period overlaps with the writing discharge period of the scan electrode group and the sustain electrode group other than the n-th scan electrode group.

According to a fifth aspect of the present invention, there is provided a method of driving a plasma display, comprising: a scan electrode group including M (positive integer) scan electrodes corresponding to scan lines of a display cell formed on the same plane; A sustain electrode group consisting of M sustain electrodes functioning to maintain cell discharge, and a plurality of data electrodes which are orthogonal to the scan electrode group and the sustain electrode group and are driven by receiving predetermined display data. Scanning in an AC discharge memory type plasma display
The pre-discharge period, pre-discharge erase period,
And a discharge period, and at least for each scanning line.
The preliminary discharge erase period and the write discharge period are continuous
And arrange the continuous pre-discharge erase period and write
The discharge period is sequentially scanned for each scanning line .

[0015]

In order to obtain a stable write discharge in an AC discharge memory type PDP, it is effective to perform a preliminary discharge once prior to the write discharge as described in the conventional example.
The effects of the preliminary discharge are optimization of wall charges on each electrode and generation and activation of active particles (charged particles, excited particles, etc.) in the discharge space. The wall charge has a relatively long lifetime, but the active particles decay quickly. The present invention has solved the problems of the prior art by using the above-described means. That is, the present invention reduces the time from preliminary discharge erase to write discharge
Unlike the conventional method, the active particles generated by the preliminary discharge are actively and effectively used as seeds for the write discharge, and the high-speed writing is performed by shortening the electrode by blocking the electrode and scanning the preliminary discharge and preliminary discharge erase. The operation is realized. According to this method, a write discharge is generated in a state where the active particles generated by the preliminary discharge or the preliminary discharge erasure are filled in the cells. Therefore, there are sufficient types of discharges, so that an increase in the write discharge voltage can be suppressed. As a result, a high-speed write operation was stably realized. Further, it is no longer necessary to strictly control the wall charges as in the conventional driving method. FIG.
As shown in FIG. 1, in the region where the time from the preliminary discharge erase to the write discharge is within about 500, 200, and 100 μS, respectively, the data pulse voltage is not increased even when the data pulse width is 3, 2, 1 μS. Write discharge can be generated. As described above, by appropriately limiting the time from the preliminary discharge erase to the write discharge in accordance with the data pulse width and the scan pulse width,
Large display capacity PDP that can speed up the write operation
This is effective for driving.

[0016]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an electrode arrangement of an AC discharge memory operation type PDP to which the present invention is applied. In FIG. 1, display cells 8a are formed by arranging them in a matrix of 3m × k rows and columns. The electrode arrangement of the PDP 7a for dot matrix display is shown.

FIG. 2 is a cross-sectional view of the first and second embodiments.
Is a schematic diagram showing the internal section of one period in the driving timings of the first embodiment of the invention according, the total scan lines, shows an example of a case of dividing the scanning block 1, the scanning block 2 and the scanning block 3 . In FIG. 2, first, the first block of one block of the scanning line previously divided, that is, all the display cells 8a of the scanning block 1
(Refer to FIG. 1).
-1a), then all display cells 8 of scan block 1
a at the same time as the preliminary discharge erasing period (2-1).
a) exists, and the subsequent write discharge period (3-1a)
In, a write pulse is applied line-sequentially from the first scanning line of the block. In FIG. 2, the shaded portion corresponds to the write timing of each scanning line. After the writing in the scanning block 1 is completed, there is a pre-discharge period (1-1b) in which all the display cells 8a of the subsequent scanning block 2 are pre-discharged at the same time. Thereafter, the same drive scanning is repeated for other scanning blocks. Done. Thus, the final scan block 3
After the end of the writing period, there is a sustain discharge period (4-1) in which all scan blocks are simultaneously sustained. Thus, a desired display image can be obtained by repeatedly performing a series of drive sequences.

FIGS. 3 (a), (b), (c), (d),
(E), (f), (g), (h), (i), and (j) are timing charts showing an example of the drive voltage waveform in the first embodiment described above. FIG. 3 (a), (b)
And (c) are applied to sustain electrodes Su11 to Su1m of scan block 1, sustain electrodes Su21 to Su2m of scan block 2, and sustain electrodes Su31 to Su3m of scan block 3 in PDP 7a shown in FIG. FIG. 3 shows sustain electrode drive waveforms COM1, COM2, and COM3 common to each block.
(D), (e), (f), (g), (h) and (i)
Is the scan electrode Sc11 of the scan block 1 shown in FIG.
And Sc12, scan electrode drive waveforms S11, S12, S21, S22, S31, and S applied to scan electrodes Sc21 and Sc22 of scan block 2 and scan electrodes Sc31 and Sc32 of scan block 3, respectively.
3 (j) shows the data electrode D in FIG.
Data electrode drive waveform DA applied to i (1 ≦ i ≦ k)
TA is shown. Note that the data electrode drive waveform DATA
Indicates that the data pulse 6a is selected to be on or off depending on the presence or absence of data.

The preliminary discharge period (1-1) of the scan block 1
In a), a preliminary discharge pulse 1a is applied to all the scanning electrodes in the block. Further, in the subsequent predischarge erasing period (2-1a), the predischarge erasing pulse 2a is similarly applied to all sustain electrodes in the block. In the subsequent write discharge period (3-1a) of the scan block 1, the scan electrodes Sc11, Sc12,. . . , Sc1m in this order. When writing to the (1-1i) th display cell 8a, a discharge is generated between the scan electrode Sc11 and the data electrode D1 by applying the data pulse 6a in synchronization with the timing of the scan pulse 3a. Let it. The (1-1i) th display cell 8
When writing to a is not performed, the data pulse 6a is not applied. After the scan of the scan electrode Sc1m, that is, the end of the write discharge, the preliminary discharge, the preliminary discharge erase and the scan of the scan block 2, and the preliminary discharge, the preliminary discharge erase and the scan of the scan block 3 are sequentially performed.

According to the above sequence, after the pre-discharge, pre-discharge erasure and scanning of all scan blocks are completed,
The scanning electrodes Sc11 to Sc1m, Sc21 shown in FIG.
To Sc2m and Sc31 to Sc3m, the sustain pulse 4a is applied to the scan electrodes Sc11 to Sc1m and Sc21 to Sc.
2m, and sustain pulses 5a for Sc31 to Sc3m.
Are applied alternately to the sustain pulse period (4-1).
To form The sustain pulse period (4-1) ends after the number of sustain pulses corresponding to the required light emission luminance is applied.

Next, FIG. 4 shows claims 1 and 3.
Is a schematic diagram showing the internal section of one period in the driving timing of the second embodiment of the invention according, the total scan lines, as in the first embodiment, the scanning block 1, the scanning block 2 and the scanning block An example in the case of dividing into three into three is shown. In FIG. 4, first, there is a preliminary discharge period (1-3a) in which the first block, that is, all the display cells 8a of the scanning block 1 are simultaneously pre-discharged, and then all the display cells 8a of the scanning block 1 are simultaneously pre-discharged and erased. The pre-discharge erase period (2-3a) and the write discharge period (3-3
a) exists. During the write discharge period of the scan block 1, the preliminary discharge period (1-3b) and the preliminary discharge erase period (2-3b) of the scan block 2 are started in order, and the write discharge of the scan block 1 and the preliminary discharge period of the scan block 2 are started. The discharge erasure ends at the same time. At this time, the write discharge of the scan block 2 is started immediately after the write discharge of the scan block 1. Thereafter, the same driving operation is repeatedly performed until the scan block 3 is reached. Then, after the end of the write discharge period (3-3c) of the last scan block 3, a sustain discharge period (4-3) in which all the scan blocks including the scan block 1, the scan block 2, and the scan block 3 are simultaneously sustained. A desired display image can be obtained by repeating these series of drive sequences.

A specific example of the drive waveform of this embodiment can be constituted by a combination based on each drive pulse in the first embodiment described above, and the description will be omitted because it will be redundant. Hereinafter, the same applies to the third and fourth embodiments of the present description.

FIG. 5 is a schematic diagram showing an internal section of one cycle in the drive timing of the third embodiment of the present invention according to the first and second aspects. As in the case of the first and second embodiments, an example is shown in which the scanning block 1, the scanning block 2 and the scanning block 3 are divided into three. In FIG. 5, first, there is a preliminary discharge period (1-4a) in which all display cells 8a of all scan blocks 1 are simultaneously preliminary discharged, and then preliminary discharge erasure is performed in which all display cells 8a of only scan block 1 are simultaneously preliminary discharged. There is a period (2-4a) and its write discharge period (3-4a). After the writing of the scanning block 1 is completed,
There is a pre-discharge erasing period (2-4b) for simultaneously pre-erasing and erasing all display cells 8a of only the scanning block 2 and a writing discharge period (3-4b). Thereafter, in the scanning block 2, the same driving operation is performed. Done. Then, the write discharge period (3-4) in the final scan block 3
After the end of c), there is a sustain discharge period (4-4) in which all the scan blocks including the scan block 1, the scan block 2, and the scan block 3 are simultaneously sustained, and a series of these drive sequences is repeatedly performed. As a result, a desired display image is obtained.

Next, FIG. 6 shows claims 1 and 4.
Is a schematic diagram illustrating a one cycle internal section of the driving timing of the fourth embodiment of the invention according, the total scan lines, as in the case of the embodiment, the scanning block 1, the scanning block 2 and the scanning block 3 An example in the case of three divisions is shown. In FIG. 6, first, a preliminary discharge period (1-1-) in which all display cells 8a of all scan blocks are simultaneously preliminary-discharged.
5a), and then the preliminary discharge erasing period (2--) in which all display cells 8a of only the scanning block 1 are simultaneously preliminary-discharge-erased.
5a) and its write discharge period (3-5a). During the writing discharge period (3-5a) of the scanning block 1, the preliminary discharge erasing period (2-5b) of the scanning block 2 is started, and the writing discharge of the scanning block 1 and the preliminary discharge erasing of the scanning block 2 end at the same time. . At this time, the write discharge of the scan block 2 is started immediately after the write discharge of the scan block 1. Hereinafter, the same driving operation is performed.
This operation is repeatedly performed until the scanning block 3 is reached. After the end of the write discharge period (3-5c) of the last scan block 3,
Scan block 1, scan block 2, and scan block 3
There is a sustain discharge period (4-5) in which all the scan blocks including are simultaneously discharged, and a desired display image can be obtained by repeating a series of these drive sequences.

In the above-described embodiment, the first and third methods require a special time for the preliminary discharge and the preliminary discharge erasure, so that the writing period and the sustain discharge period are shortened. There is no problem due to interference between blocks. On the other hand, in the second and fourth methods, although there is a decrease in operation margin and subtle adjustments due to interference between blocks, time can be used effectively, and it is effective in increasing luminance and increasing display capacity. is there.

The method of driving in blocks has been briefly described above. Such a method is applied to the actual large display capacity P.
When the present invention is applied to the DP, by increasing the number of blocks, the time from the preliminary discharge or the preliminary discharge erase discharge of each block to the write discharge in each block can be shortened. Therefore, reliable writing can be performed, and the pulse width of the writing discharge can be shortened. However, the drive circuit and its control circuit become complicated by increasing the number of blocks. Further, when the preliminary discharge period and the preliminary discharge erase period are independent from each other as in the first embodiment, there is a problem that if the number of blocks is excessive, the period that can be used for the write discharge is shortened. Therefore, in consideration of these points, the number of blocks and the scanning pulse width may be selected according to the product design. For example, a 256-gradation PDP having 480 scanning lines and 8 subfields was divided into 4 blocks, and good display was obtained using a scanning pulse of about 2.5 μS. In this case, the period from the discharge of the pre-discharge erase to the last writing scan in the block is 300 μS. Also, in driving a PDP with 1000 scanning lines for 256 gradation display, for example, the PDP is divided into 10 blocks and approximately 1.
It can be driven by using a scanning pulse having a width of 0 μS. In this case, all the writing scans within the block from the discharge of the pre-discharge erase are completed within 100 μS.

Next, as a fifth embodiment of the invention according to claim 5, Figure is a schematic view showing use of a panel shown in FIG. 12, in the case of scanning the pre-discharge, the internal section of one period in the driving timing FIG.

In FIG. 7, for each scanning line, there is a preliminary discharge period (1-7) in which all display cells 8b (see FIG. 12) on each scanning line are simultaneously pre-discharged. Then, there is a pre-discharge erasing period (2-7) in which all display cells 8b on each scan line are pre-discharge-erased at the same time, followed by a writing discharge period.
A scanning pulse is applied to (3-7). One scan line
The preliminary discharge period, preliminary discharge erase period,
Discharge periods are arranged consecutively, and the same scan is performed in the next scan line.
The cycle is repeated at different times, and the PDP panel 7b
Pre-discharge, pre-discharge erasing line-sequentially from the first scan line
Finally, the writing discharge is scanned. After the scan pulse of the last scan line is completed, the display discharge is maintained in the pixels selected by the scan pulse and the data pulse during the subsequent sustain discharge period (4-7).

In FIG. 7, the portions indicated by the parallelograms indicate the preliminary discharge timing, the preliminary discharge erase timing, and the write discharge timing of each scanning line, respectively. Thus, a desired display image is obtained.

FIGS. 8 (a), (b), (c), (d) and (e) are timing charts showing an example of the drive voltage waveform in the fifth embodiment described above. 8A and 8C show sustain electrode driving waveforms SuC1 and SuC2 applied to sustain electrodes Su1 and Su2 in PDP 7 shown in FIG. 12, respectively.
(B) and (d) are shown in FIG. Scan electrode S
8 shows sustain electrode driving waveforms SuC1 and SuC2 applied to c1 and Sc2, respectively.
(B) and (d) show the scanning electrode S shown in FIG.
FIG. 8E shows scan electrode driving waveforms ScC1 and ScC2 applied to c1 and Sc2, respectively.
Indicates a data electrode driving waveform DATA applied to the data electrode Di (1 ≦ i ≦ k) in FIG. The diagonal lines in the data electrode driving waveform DATA indicate that the data pulse 6d is selected to be on or off depending on the presence or absence of data.

Referring to FIG. 8, for example, focusing on the first scan line, first, a pre-discharge pulse 1c for simultaneously pre-discharging all display cells 8b (see FIG. 12) on the first scan line is generated by a sustain electrode. Su1 is applied. Next, the preliminary discharge erasing pulse 2c for simultaneously erasing the preliminary discharge for all the display cells 8b on the first scan line is applied to the scan electrode Sc1.
Then, the scanning pulse 3c is also applied to the scanning electrode Sc1. When writing data to the display cell 8a, the data pulse 6c is applied in synchronization with the timing of the scanning pulse 3c. After such a series of operations is completed up to the last scan line, the sustain pulse 4c is alternately applied to the sustain electrode Su1, and the sustain pulse 5c is alternately applied to the scan electrode Sc1.

Next, as a sixth embodiment of the invention according to claim 5, using the panel shown in FIG. 12, with scanning the preliminary discharge, the case of applying by mixing the scan sustain discharge, the drive timing FIG. 9 is a schematic diagram showing the internal division of one cycle in FIG.

In FIG. 9, for each scanning line, first, there is a pre-discharge period (1-8) in which all display cells 8b (see FIG. 12) on each scanning line are pre-discharged simultaneously. Then, there is a pre-discharge erasing period (2-8) in which all display cells 8b on each scanning line are pre-discharged and erased at the same time.
A scanning pulse is applied to (3-7). In the pixel selected by the scan pulse and the data pulse, the display discharge is maintained in the subsequent sustain discharge period (4-8), and the sustain discharge is finally erased in the sustain discharge erase period (20-8). In one scan line, the pre-discharge period
Period, pre-discharge erase period, write discharge period, sustain discharge period
And the sustain discharge erasing period is continuously arranged during the next scanning line.
The same cycle is repeated at different times with
Preliminary discharge in a line-sequential manner from the first scanning line of the panel 7b,
Pre-discharge erase, write discharge, sustain discharge, sustain discharge erase
Is scanned.

In FIG. 9, the portions indicated by parallelograms indicate the pre-discharge timing, pre-discharge erase timing, write discharge timing, sustain discharge timing, and sustain discharge erase timing of each scanning line, respectively. . As described above, a desired display image is obtained by the subfield period (21-8) which is a unit of a series of drive sequences.

FIGS. 10 (a), (b), (c), (d) and (e) are timing charts showing an example of the drive voltage waveform in the sixth embodiment. FIGS. 10A and 10C show sustain electrode driving waveforms SuD1 and SuD2 respectively applied to sustain electrodes Su1 and Su2 in PDP 7b shown in FIG.
0 (b) and (d) show scan electrode drive waveforms ScD1 and ScD2 respectively applied to scan electrodes Sc1 and Sc2 shown in FIG.
(E) shows the data electrode Di (1 ≦ i ≦) in FIG.
9 shows a data electrode drive waveform DATA applied to k). The diagonal lines in the data electrode driving waveform DATA indicate that the data pulse 6d is selected to be on or off depending on the presence or absence of data.

In FIG. 10, focusing on the first scanning line, for example, first, all the display cells 8b (see FIG. 12) on the first scanning line are pre-discharged at the same time. Su1 is applied. Next, a preliminary discharge erasing pulse 2d for simultaneously erasing preliminary discharge of all display cells 8b on the first scan line is applied to the scan electrode Sc1.
And a scanning pulse 3d is also applied to the scanning electrode Sc1. When writing data to the display cell 8a, the data pulse 6d is applied in synchronization with the timing of the scanning pulse 3d. After that, sustain pulse 4
d is for the sustain electrode Su1, and the sustain pulse 5d is for the scan electrode Sc.
1, and the sustain erasing pulse 20d is finally applied to the scan electrode Sc1. These series of operations are performed line-sequentially until the last scanning line, and the subfield period (21-8) for one display is completed.
In the fifth and sixth embodiments described above, the scanning is performed by grouping the preliminary discharge period, the preliminary discharge erasing period, and the writing discharge period. Although the same effect can be obtained by scanning, the operation is slightly inferior in high-speed operation as compared with the above-described embodiment, but is advantageous in terms of operation stability because there is little interference with other lines.

In the above-described driving method in which the preliminary discharge, the preliminary discharge erase, and the write discharge are scanned in a set,
The period from the discharge of the pre-discharge or the pre-discharge erase to the write pulse can be made very short over all the lines regardless of the number of scanning lines. For example, this period could easily be 20
μS or less, and the write pulse width is 0.8
Good operation is realized even if the width is reduced to about 2 μS.

Although the embodiment has been described above, the large display capacity P
In the DP, the time from the discharge of the preliminary discharge erasure to the write pulse in each scan block was desirably 800 μS or less in order to obtain more stable write characteristics. For longer times, there was not much advantage in using the method of this patent. On the other hand, from the viewpoint of further increasing the speed and writing at a low voltage, it is desirable to set it to 300 μS or less.

Further, in the embodiment of the present invention, when the scanning electrodes are divided into blocks, the number of scanning electrodes in each scanning block is equal. However, the present invention is not limited to this, and the number of scanning electrodes in each scanning block is different. It goes without saying that this may be done.

[0041]

As described above, according to the present invention, a high-speed write operation can be realized by positively utilizing active particles generated in the pre-discharge period and the pre-discharge erase period. As a result, a large-capacity full-color PDP having about 1000 scanning lines could be driven with good display.
As an application example of this PDP, a video display device such as a high-definition full-color wall-mounted TV can be realized.

[Brief description of the drawings]

FIG. 1 shows an AC discharge memory operation type PD to which the present invention is applied.
It is a top view which shows the electrode arrangement of P.

FIG. 2 is a schematic diagram showing a division of a drive timing cycle according to the first embodiment of the present invention.

FIG. 3 is a timing chart showing an example of a drive voltage waveform in the first embodiment.

FIG. 4 is a schematic diagram showing a division of a drive timing cycle according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram showing a division of a drive timing cycle according to a third embodiment of the present invention.

FIG. 6 is a schematic diagram showing a division of a drive timing cycle according to a fourth embodiment of the present invention.

FIG. 7 is a schematic diagram showing a division of a drive timing cycle according to a fifth embodiment of the present invention.

FIG. 8 is a timing chart showing an example of a drive voltage waveform in the fifth embodiment.

FIG. 9 is a schematic diagram showing a division of a drive timing cycle according to a sixth embodiment of the present invention.

FIG. 10 is a timing chart showing an example of a drive voltage waveform in the sixth embodiment.

FIG. 11 is a diagram for explaining the operation of the present invention.

FIG. 12 is a plan view showing a conventional electrode arrangement of an AC discharge memory operation type PDP.

FIG. 13 is a cross-sectional view showing a configuration of one display cell of an AC discharge memory operation type PDP.

FIG. 14 is a schematic diagram showing a division of a drive timing cycle in a conventional example.

FIG. 15 is a timing chart showing an example of a drive voltage waveform in a conventional example.

[Explanation of symbols]

1-1a to 1-1c, 1-3a to 1-3c, 1-4a to
1-4c, 1-5a to 1-5c, 1-6, 1-7, 1-
8 Pre-discharge period 1a to 1d Pre-discharge pulse 2-1a to 2-1c, 2-3a to 2-3c, 2-4a to
2-4c, 2-5a to 2-5c, 2-6, 2-7, 2-
8 Pre-discharge erase period 2a to 2d Pre-discharge erase pulse 3-1a to 3-1c, 3-3a to 3-3c, 3-4a to
3-4c, 3-5a to 3-5c, 3-6, 3-7, 3-
8 Write discharge period 3a-3d Scan pulse 4-1, 4-3,4-4,4-5,4-6,4-7,4
-8 Sustain discharge period 4a to 4d, 5a to 5d Sustain pulse 6a to 6d Data pulse 7a, 7b PDP panel 8a, 8b Display cell 9 Partition 10, 17 Dielectric 11, Sc1 to Scj, Sc11 to Sc1m, Sc21
To Sc2m, Sc31 to Sc3m Scanning electrode 12 Discharge gas space 13, 19 Insulating substrate 14, Sc1 to Scj, Sc11 to Sc1m, Sc21
Su2m, Sc31 to Sc3m Sustain electrode 15 Protective film 16 Phosphor 18, D1 to Dk Data electrode 20-8 Sustain erase period 20d Sustain erase pulse 21-8 Subfield period

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Shuji Nakamura 5-7-1 Shiba, Minato-ku, Tokyo Within NEC Corporation (56) References JP-A-5-188877 (JP, A)

Claims (5)

(57) [Claims] 1. A scan electrode group consisting of M (positive integer) scan electrodes corresponding to scan lines of a display cell formed on the same plane, and M sustain electrodes functioning to maintain discharge of the display cell. A sustain electrode group composed of electrodes and an AC discharge electrode composed of a plurality of data electrodes that are orthogonal to the scan electrode group and the sustain electrode group and are driven by receiving predetermined display data.
In the electric memory type plasma display panel, the pre-discharge period and the collective pre-discharge period for each block composed of N (an integer of 2 or more) sets of scan electrode groups and sustain electrode groups formed by dividing the value of M are defined. It has a batch pre-discharge erase period and a write discharge period that is scanned sequentially.
And at least the preliminary discharge erasing period for each block is
It is out of time with the pre-discharge erase period of other blocks.
The preliminary discharge erase period for each block and the preliminary discharge
The write erase period of the same block as the erase period is
A method for driving a plasma display, the method comprising: 2. A pre-discharge period and a pre-discharge of an n-th (positive integer: 1 ≦ n ≦ N) block in N scan electrode groups and sustain electrode groups formed by dividing the numerical value of M. 2. The method according to claim 1, wherein the erase period does not overlap with the write discharge periods of the scan electrode group and the sustain electrode group other than the n-th scan electrode group. 3. A pre-discharge period and a pre-discharge of an n-th (positive integer: 1 <n ≦ N ) block in N scan electrode groups and sustain electrode groups formed by dividing the numerical value of M. 2. The method according to claim 1, wherein the erase period overlaps the write discharge periods of the scan electrode group and the sustain electrode group other than the n-th scan electrode group. 4. The pre-discharge period of an n-th (positive integer: 1 <n ≦ N ) -th block in the N scan electrode groups and the sustain electrode groups formed by dividing the numerical value of M is n-th. 2. The pre-discharge erasing period does not overlap with the write discharge period of the scan electrode group and the sustain electrode group other than the n-th scan electrode group and the sustain electrode group. Driving method of plasma display. 5. A scan electrode group consisting of M (positive integer) scan electrodes corresponding to scan lines of a display cell formed on the same plane, and M sustain electrodes functioning to maintain discharge of the display cell. a sustain electrode group consisting of electrodes, perpendicular to the scanning electrode group and the sustain electrode group, the AC discharge memory type plasma display comprising a plurality of data electrodes are driven by being supplied with predetermined display data, the scanning line
Pre-discharge period, pre-discharge erase period,
And a discharge period, and at least
The preliminary discharge erase period and the write discharge period are continuously performed.
Arrange the continuous pre-discharge erase period and write discharge
A driving method for a plasma display, wherein a period is sequentially scanned for each scanning line .