KR20010000986A - Method for Driving Alternative Current Surface-discharge Plasma Display Panel - Google Patents

Abstract

PURPOSE: A driving method for an AC surface discharge plasma display panel is provided to increase data and gradation display, and reduce data loss and components of sustain discharge circuit. CONSTITUTION: A method comprises the steps of dividing all display lines into odd and even numbers; sequentially scanning the odd-numbered display lines; sequentially scanning the even-numbered display lines; performing a sustain discharge for cells with respect to the odd-numbered display lines with data already written therein, during the scanning period of the even-numbered display lines; and performing a sustain discharge for cells with respect to the even-numbered display lines where data have been written in the previous sub-field, during the scanning period of the odd-numbered display lines of the subsequent sub-field.

Description

Method for driving AC type surface discharge plasma display device {Method for Driving Alternative Current Surface-discharge Plasma Display Panel}

The present invention relates to an AC type surface discharge plasma display, and more particularly, to a method of driving an AC type surface discharge plasma display device which simultaneously writes and displays data.

In the conventional method of driving an AC type surface discharge plasma display device, one field is divided into a plurality of subfields, each subfield is assigned a different number of sustain pulses, and then one subfield is first displayed on all scan lines. There is a driving method which simultaneously performs sustain discharge after writing data (see attached drawing 1, see Japanese Patent Application Laid-Open No. 90-331589 (19990.11.28) Fujitsu Patent). Using this method, when eight bits of 256 gray levels are to be displayed, eight subfields having different weights can be displayed in one subfield period at a time of 16.7 ms. For example, if there are 480 scanning electrodes to scan in one subfield and the scanning time per one is 3 ms, the total time required for scanning is 480 × 3 ms × 8 (bits, times) = 11.52 ms, and the rest is 5.78 ms is used for sustain discharge.

However, the above-described conventional method uses sustain discharge separately from data write (SCAN), and the scanning time is longer than the sustain period during which actual display discharge is performed, and thus there is a limit to more gradation processing.

Shorter sustain pulses, i.e., high frequency pulses, may be applied to express sufficient gradation during this limited sustain period, but this causes a lot of problems in power consumption and driving stability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of driving an AC surface discharge plasma display device that is capable of expressing sufficient gray scale without increasing the sustain pulse frequency by securing a sufficient sustain discharge time in one subfield.

According to the first aspect of the present invention, in dividing one field into a plurality of subfields and displaying any one subfield among the plurality of subfields, all display lines are divided into odd and even numbers, and then odd display lines first. After sequential scanning, the even-numbered display lines are sequentially scanned, and sustain discharge of the cells is performed for the odd-numbered display lines for which data has already been written during the inter-injection of the even-numbered display lines, followed by the odd-numbered display lines of the next subfield. During the sequential scanning, sustain discharge of the cells for the even display lines to which data is written in the previous subfield is performed.

According to this method, by displaying the even (or odd) display lines of the previous (or the same) subfield simultaneously with the data writing of the odd (or even) display lines in the display of one subfield,

1) Since there is no need for a separate labeling period,

2) Data and gradation can be displayed higher than normal 8bit 256 gradation

3) Data destruction can be reduced by performing sustain discharge after scanning only odd or even display lines in one subfield.

4) The number of sustain discharge circuit components can be reduced to about 1/2 of the conventional method.

1 is a view showing a time display by a method having a sustain discharge period, illustrating a conventional ADS;

2A shows data scanning and maintenance according to a conventional method,

2b shows data scanning and maintenance according to the method of the present invention;

3 shows an injection and maintenance method according to the invention,

4 is a waveform diagram showing driving waveforms applied to the electrodes of FIG. 2B when displaying each subfield of the present invention; FIG.

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

1 divides one field period (16.7 ms) into eight subfields, allocates different sustain pulses to each subfield, and sequentially scans all scan lines (e.g., 480 lines) in each subfield. The following shows a conventional address / display separation driving method in which sustain discharge is performed by the number of sustain pulses allocated to the corresponding subfield. In this case, the scan time of all scan lines in each subfield is the same. In other words, if the scanning line has 480 copies and the scanning unit time per line is 3 ms, the scanning time of one subfield is 1.44 ms, and the total scanning time of one field is 11.52 ms. The method for shortening this scan time is almost a fixed time required except for dividing the day electrodes. Therefore, as in the conventional method described above, when separating between the syringes and the display period in one subfield, the total scanning time can only use the remaining 5.78ms except the 11.52ms as the display time and thus cannot process sufficient gradation.

FIG. 2A shows that the sustain electrodes are commonly tied and the scan electrodes 1S, 2S, 3S. 480S and so on indicate that the scan is independent.

Figure 2b shows a method according to the present invention is shown that the sustain (SUSTAIN) electrode is tied to each of the odd and even number in common.

3 shows an injection and maintenance method according to the invention. In FIG. 3, one field is divided into eight subfields, and each subfield is between odd display line syringes, even display line syringes, even display line holding periods of the previous subfield, and odd display line display of the corresponding subfield. Include the term. At this time, between the odd display line syringes and the even display line syringes cannot overlap each other in the first subfield, the odd display line syringes and the even display line holding periods of the previous subfield, the even display line syringes, and the corresponding subfields are not overlapped. Odd display line display periods of are overlapped with each other. In addition, it is preferable to set the even display line holding period of the previous subfield and the odd display line display period of the corresponding subfield differently in the same subfield, but according to the method of setting the holding period of the subfield for each subfield. The same may be set.

In this way, the sustain discharge period can be set longer by simultaneously performing sustain discharge on the display lines in which data is written in the previous subfield or the same subfield while scanning the odd or even display lines of any one subfield. . In other words, assuming that the display line is NTSC 480 line, the maintenance discharge can be used by overlapping the scan time as well as the scan time 11.52ms with the remaining 5.78ms except the minimum total scan time 11.52ms in one field. Sufficient gradation can be displayed without increasing the discharge frequency.

FIG. 4 shows driving waveforms applied to the electrodes of FIG. 2B when displaying each subfield of the present invention. In order to equalize the cell state of all the display lines during the reset period R of the first subfield, after applying a write pulse Pw of sufficient magnitude to perform a front discharge, an erase pulse Pe is applied to each cell. Eliminates wall charges accumulated on the dielectric. In the address period Ao of the next odd display line, the scan pulse Ps is applied to the scan electrodes 1S, 3S, ... 479S of the odd display line and the signal pulse Pd input to the data electrode is applied. Then, the wall charges are accumulated in the cells to be displayed among the odd numbered display lines. In the first subfield, the even display lines do not display and have a rest period during the odd display line data writing (addressing) period. When data writing on odd display lines ends, data writing on even display lines is similarly performed. That is, the scan pulse Ps is applied to the scan electrodes 2S, 4S, ... 480S of the even display line in the address period Ae of the even display line, and the signal pulse Pd input to the data electrode is simultaneously applied. It is applied to accumulate wall charge in the cells to be displayed among even-numbered display lines and assign address. In this case, the erase pulses are performed after the sustain discharge is performed by the number of sustain pulses allocated to the first subfield for the cells specified in the data write (addressing) period of the odd odd display lines, overlapping with the data write (addressing) period of the even display lines. (Pe ') is applied to terminate the sustain discharge, thereby ending the display of the first surf field. After addressing (write data) for even display lines in the first subfield and the end of sustain discharge for odd display lines, in the next subfield (second subfield), an odd number in the address period Ao of the odd display lines The scan pulse Ps is applied to the scan electrodes 1S, 3S, and 479S of the display line, and the signal pulse Pd, which is input to the data electrode, is applied to the cells of the odd display lines. Accumulate an electric charge and assign it a bungee. At this time, sustain discharge is performed by the number of sustain pulses allocated to the first subfield for the cells specified in the data write (addressing) period of the even display lines of the previous subfield, overlapping with the data write (addressing) period of the odd display lines. do. In this manner, the display of the even display lines specified in the previous subfield may be performed in the addressing period Ao of the odd display lines, and the display of the odd display lines specified in the same subfield may be performed in the addressing period Ae of the even display lines. . If in one subfield, it is also possible to address even display lines first. That is, the display of the odd display lines specified in the previous subfield may be performed in the addressing period Ae of the even display lines, and the display of the even display lines designated in the same subfield may be performed in the addressing period Ao of the odd display lines. . In the last subfield (eighth subfield), after finishing addressing (data writing) for the even display lines 2S, 4S ... 480S, the last subfield is continued without proceeding to the next subfield or the next field. After discharge is performed for the number of sustain pulses assigned to the field, the erase pulse Pe 'is applied to terminate the last subfield. After the display of one field is finished in this manner, the next field is displayed in the same manner.

In each of the subfields, the duty of the sustain pulse is set to be the same, but it is also possible to set (variably) the sustain pulse duty differently for each subfield.

The effect according to the driving method of the AC type surface discharge plasma display device of the present invention,

1) Since there is no need for a separate display (oil aging) period, there is less time constraint and more data and gradation display are possible than the conventional method.

2) It is possible to reduce the disappearance of data by performing sustain discharge after performing odd or even scan in one sub-field.

3) The number of sustain discharge circuit components can be reduced to about 1/2 compared to the conventional method.

In addition, a preferred embodiment of the present invention is disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (6)

A driving method of a plasma display device comprising a plurality of scan electrodes and a plurality of sustain electrodes arranged in parallel with each other, and data electrodes arranged to be substantially orthogonal to the scan electrodes and the sustain electrode. One field is divided into N subfields, and each subfield is assigned a different number of sustain pulses; The first subfield includes an addressing (data writing) period of odd display lines, an addressing (data writing) period of even display lines, and a sustain discharge period of odd display lines of the same subframe; Each of the second to (N-1) th subfields has an addressing period (data writing) period for odd display lines, an addressing (data writing) period for even display lines, a sustain discharge period for even display lines of the previous subfield, and the same subfield. A sustain discharge period of odd display lines in the field; The last subfield is a period of addressing odd display lines (data writing), an even number of display lines (data writing), a sustain discharge period of even display lines of the previous subfield, a sustain discharge period of odd display lines of the same subfield, and And a sustain discharge period of even display lines of the same subfield. The method of claim 1, A method of driving a plasma display device, characterized in that an addressing (data writing) period of odd display lines and an even display line display period of a previous subfield overlap each other in each subfield. The method according to claim 1 or 2, A method of driving a plasma display device, characterized in that the addressing (data writing) period of even-numbered display lines and the even-numbered display line display period of the same subfield overlap each other in each subfield. The method of claim 1, A method of driving a plasma display device, characterized in that the duty of a sustain pulse is set differently in each subfield. A driving method of a plasma display device comprising a plurality of scan electrodes and a plurality of sustain electrodes arranged in parallel with each other, and data electrodes arranged to be substantially orthogonal to the scan electrodes and the sustain electrode. One field is divided into N subfields, and each subfield is assigned a different number of sustain pulses; The first subfield includes an addressing period (data writing) period for odd display lines, an addressing (data writing) period for even display lines, and a sustain discharge period of even display lines of the same subframe; Each of the 2nd through (N-1) th subfields has an addressing (data writing) period for odd display lines, an addressing (data writing) period with even display lines, a sustain discharge period of even display lines of the same subfield, and a previous subfield. A sustain discharge period of odd display lines in the field; The last subfield is a period of addressing odd display lines (data writing), an even number of display lines (data writing), a sustain discharge period of odd display lines of the previous subfield, a sustain discharge period of even display lines of the same subfield, and And a sustain discharge period of odd display lines of the same subfield. The method of claim 5, In each subfield, the addressing (data writing) period of odd display lines and the even display line display period of the previous subfield overlap each other, and the even display of the same subfield is the same as the addressing (data writing) period of even display lines in each subfield. A method of driving a plasma display device characterized in that the line display periods overlap each other.