JP3463869B2 - Driving method of plasma display panel - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method of driving a plasma display panel.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter referred to as PD
(Abbreviated as P) can obtain a structure with a relatively large screen with a thin structure. Further, the PDP has a fast response speed, is a self-luminous type, and is capable of multicolor light emission by utilizing a phosphor. In recent years, PDPs are becoming widely used in the fields of computer-related display devices and color image displays. In this PDP, depending on its operation method,
An AC type in which the electrodes are covered with a dielectric and operated indirectly in the AC discharge state, and a DC type in which the electrodes are exposed to the discharge space and operated in the DC discharge state
There are some.

Here, an AC type PDP will be described as an example. In the case of the AC type, there are mainly a two-electrode opposed discharge type and a three-electrode surface discharge type, but since the three-electrode type is superior as the structure of the color PDP, the three-electrode surface discharge type will be described here as an example. .

FIG. 11 exemplifies the structure of a display cell in a 3-electrode AC surface discharge PDP. This display cell includes an insulating substrate 1 and 2, an operating electrode 3, a sustaining electrode 4, trace electrodes 5 and 6, a data electrode 7, a discharge gas space 8, a partition wall 9, a phosphor 11, and a dielectric. Body 12, protective layer 13,
A dielectric 14 is provided.

The insulating substrate 1 is made of glass which forms the back surface of the display cell. The insulating substrate 2 is made of glass that forms the front surface of the display cell. The scan electrodes 3 and the sustain electrodes 4 are transparent electrodes formed under the insulating substrate 2. The trace electrodes 5 and 6 are arranged below the scan electrode 3 and the sustain electrode 4. In order to reduce the electrode resistance value of the trace electrodes 5 and 6, the trace electrodes 5 and 6 are connected to the scan electrode 3 and the sustain electrode 4.
Overlaid on. A dielectric 12 is disposed below the trace electrodes 5 and 6 and the scan electrodes 3 and the sustain electrodes 4. A protective layer 13 is arranged below the dielectric 12. Protective layer 13
Is made of magnesium oxide or the like which protects the dielectric film 12 from discharge.

Data electrodes 7 are arranged on the insulating substrate 1 so as to be orthogonal to the scan electrodes 3 and the sustain electrodes 4. The dielectric 1 is formed on the insulating substrate 1 so as to cover the data electrodes 7.
4 are arranged. A pair of partition walls 9 are arranged on the dielectric 14. The discharge gas space 8 covered with the dielectric 14, the barrier ribs 9 and the protective layer 13 is filled with a discharge gas composed of helium, neon, xenon or the like or a mixed gas thereof.

The ultraviolet rays generated by the discharge of the discharge gas are
It is converted into visible light by the phosphor 11.

FIG. 12 shows the concept of the electrode arrangement of the AC PDP. In the arrangement shown in the drawing, the scan electrodes S (S1 to Sn) and the sustain electrodes C (C1 to Cn) provided in parallel, and the data electrodes D (D provided in the direction orthogonal to these electrodes are provided.
1 to Dm). The intersections of the scan electrodes S and the sustain electrodes C and the data electrodes D form cells that emit light. That is,
One scan electrode, one sustain electrode, and one data electrode constitute one cell. Therefore, the number of cells in one screen is (n × n) in the case of n scan electrodes and sustain electrodes × m data electrodes.
m).

The conventional driving operation of the PDP shown in FIGS. 11 and 12 will be described with reference to FIGS. 13 and 14.

FIG. 13 is a first explanatory diagram of the driving operation to which the subfield method is applied. The driving operation shown in the drawing shows a case where 64 gradations are displayed in a single color using, for example, 6 subfields. That is, 1/60 second
An image (1 field) that is switched at a rate of one sheet is represented by superposition of 6 subfields SF1 to SF6. Since each of the sub-fields SF1 to SF6 has a different display brightness by a power of 2, it is possible to obtain a desired brightness by an appropriate combination.

In this method, each subfield (S
F) is a reset period TR, a scanning period TW, a sustain period T
Divided into K.

The reset period TR is a period for erasing the wall charges generated in the previous subfield and resetting the display data. The scanning period TW is a period in which the write discharge is generated in the display cell to be displayed and the wall charge is formed. The sustain period TK is a period in which a sustain pulse is repeatedly applied to achieve a desired display.

FIG. 14 is a second explanatory diagram of the driving operation to which the subfield method is applied. In the reset period TR shown in the figure, when a priming discharge called priming occurs between the scan electrode and the sustain electrode, active particles such as electrons and metastable atoms are generated in the discharge space, and writing discharge easily occurs. Become. Subsequently, the wall charges are erased by the weak discharge caused by the priming erase pulse.

In the scanning period TW shown in the figure, the scanning base pulse (Vbw) is applied to all the scanning electrodes. Further, a scan pulse is sequentially applied to each scan electrode, and a data pulse is selectively applied to the data electrode of the display cell to be displayed in synchronization with this scan pulse. By applying these, write discharge is generated in the cell to be displayed, and wall charges are formed. By applying the scan base pulse, it is possible to reduce the amplitude of the scan pulse, thereby lowering the maximum operating voltage of the driving IC having a high withstand voltage for generating the scan pulse, thereby reducing the cost of the IC. You can Further, when the value of the scan pulse is large, discharge is generated at the rising edge of the scan pulse, but this discharge is a harmful discharge that extinguishes wall charges generated by the scan pulse and the data pulse. Therefore, by applying the scan base pulse, it is possible to reduce the value of the scan pulse and prevent this harmful discharge.

Further, in the sustain period TK shown in the figure, a sustain voltage lower than the discharge threshold voltage is applied to all cells. By this application, discharge exceeding the threshold voltage of discharge occurs due to the superposition of the wall charges formed by the write discharge and the sustain voltage only in the cells in which the write is executed in the scanning period TW. A desired display is realized by repeatedly applying the sustain pulse.

[0016]

In the above PDP driving method, the writing operation of the display data in the scanning period TW is unstable, and the writing discharge does not occur. Especially, if the selected cells are closely spaced,
The instability of the writing discharge was remarkable because there was no inflow of active particles caused by the writing or sustaining discharge of the adjacent cells.
The situation in which the writing discharge does not occur causes the flickering of the image display.

It is an object of the present invention to provide a driving method of a plasma display panel, which can improve the stability of writing discharge and avoid the flickering of image display.

[0018]

Means for solving the problem Means for solving the problem are expressed as follows. The technical matters appearing in the expression are enclosed in parentheses () and added with numbers, symbols and the like. The numbers, symbols and the like are technical matters constituting at least one embodiment or a plurality of examples of the plurality of embodiments or a plurality of examples of the present invention, particularly, the embodiment or the example. It corresponds to the reference numbers, reference symbols, etc. attached to the technical matters expressed in the drawings corresponding to. Such reference numbers and reference symbols clarify correspondences and bridges between the technical matters described in the claims and the technical matters of the embodiments or examples. Such correspondence / bridge does not mean that the technical matters described in the claims are limited to the technical matters of the embodiment or the examples.

In the plasma display panel driving method according to the present invention, a reset period (period) for erasing wall charges to reset display data, and odd row display data or even row display data in odd row cells and even row cells. A primary scanning period (period) for writing any one of the above, and a scanning erasing period (period) for erasing the odd row display data or the even row display data from either the odd row cell or the even row cell, and the odd row Even-numbered display data is written to even-numbered rows where display data has been erased, and odd-numbered row display data is written to odd-numbered cells where even-numbered row display data has been erased. 2
The next scanning period (period) and the sustain period (period) in which the sustain pulse is applied to the odd-row cells and the even-row display cells are provided.

According to the plasma display panel driving method of the present invention, the scanning period for writing the display data into the display cells is divided into two. In the first writing scanning period (primary scanning period), the same display data is written in two consecutive rows at the same timing. In the subsequent scan erasing period, the display data of one row is reset. In the subsequent scanning period (secondary scanning period), the remaining display data originally written in the display cell is written in the display cell in which the display data is reset.

According to another method of driving the plasma display panel of the present invention, in the primary scanning period, the sustain electrodes of the odd row cells or the even row cells, which are erased in the scan erasing period, have the same polarity surface as the scan pulse. Discharge prevention pulse Vc
w is applied.

In a further plasma display panel driving method according to the present invention, in the scan erasing period, the sustain pulse Vs is applied to the odd row cells or the even row cells in which the erasing is not executed in the scan erasing period.

In a further plasma display panel driving method according to the present invention, a priming pulse is applied to odd-numbered cells or even-row cells which are not erased in the scan erasing period in the reset period, and the erasing is performed in the scan erasing period. The erase pulse is applied to the odd row cells or the even row cells.

In a further plasma display panel driving method according to the present invention, a priming pulse is applied to an odd row cell or an even row cell in which erase is executed in the scan erase period during the scan erase period.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment according to the present invention will be described with reference to FIGS. FIG. 1 shows a first charge change state in a display cell according to the present invention. Figure 2
Shows a second charge change state in the display cell according to the present invention. The state (period-period) shown in FIG. 2 shows a changed state following the state (period and period) shown in FIG.

1 and 2 show a cell including a scan electrode S, a sustain electrode C and a data electrode D. The potentials applied to the scan electrode S and the sustain electrode C are indicated by the symbols of battery and ground.

Odd row cells A (101, 103) shown in FIG.
And the even-numbered cells B (102, 104) are simultaneously applied with the scanning pulse in the period (primary scanning period). Furthermore,
In this subfield, odd-row cells A are set to selected and even-row cells B are set to unselected.

Periods I-1 and I-2 indicate the states of wall charges during priming discharge and priming erase, respectively. In the priming discharge in I-1, a positive priming pulse Vp + is applied to the scan electrodes and a negative priming pulse Vp- is applied to the sustain electrodes. After the priming discharge, negative and positive wall charges are formed on the dielectrics on the scan electrodes and the sustain electrodes, respectively. In the subsequent erasing of the wall charges in I-2, a priming erasing pulse Vpe of a sawtooth wave is applied to the sustain electrodes, and a weak discharge is generated between the scan electrodes and the sustain electrodes.

The period (primary scanning period) shows the state of the wall charges in the primary scanning period for writing the display data of odd rows. Here, since the odd row cell A is the selected cell, the scan pulse Vw and the data pulse V at the same time as the cell A and the cell A are selected.
A write discharge occurs in the even row cells B to which d is applied. Further, the write discharge is first generated between the scan electrode and the data electrode, and the active particles generated during the counter discharge lower the threshold voltage of the discharge between the scan electrode and the sustain electrode. A surface discharge occurs between the electrodes.
Therefore, positive wall charges are formed on the dielectric on the scan electrodes, and negative wall charges are formed on the dielectrics on the sustain electrodes and the data electrodes.

Then, in FIG. 2, III-1 and III-2 of the period (scanning erase period) are cells B formed in the period.
The wall charges are erased by the first scanning erasing pulse Vwe1 and the second scanning erasing pulse Vwe2. III-
In No. 1, when the first scan erasing pulse Vwe1 is applied to the scan electrodes in the even-numbered rows, in the cell B, the first scan erasing pulse Vwe1 is superposed on the wall charges accumulated by the write discharge to generate the discharge. Here, since the pulse width of the first scanning erasing is sufficiently short, almost no wall charges are formed, and the polarity of the wall charges is inverted as compared to before the application of the first scanning erasing pulse. The second applied to the scan electrode in III-2
Most of the wall charges are erased by the scan erase pulse Vwe2.

The period (secondary scanning period) indicates the scanning period of even rows. Here, since the cell B is not selected, the data pulse is not applied, and as a result, the write discharge does not occur. Therefore, the state of the wall charges is maintained as it is. If the cell B is the selected cell, the data pulse is applied, and the write discharge similar to the period is generated in the cell B.

The period indicates the state of wall charges in the sustain period in which actual image display is performed. Odd row cells written in the period or even row cells written in the period are
Since positive wall charges are formed in the dielectric on the scan electrodes and negative wall charges are formed in the dielectric on the sustain electrodes, applying a negative sustain pulse to the scan electrodes and a negative sustain pulse to the sustain electrodes causes wall voltage (wall The first sustain discharge occurs due to the superposition with the voltage due to electric charge. Therefore, here, the discharge is generated only in the cell A selected in the period. When the first sustain discharge is generated, negative wall charges are formed on the scan electrodes, and positive wall charges are formed on the sustain electrodes. Therefore, the second sustain pulse generates a negative sustain pulse on the scan electrodes. It is applied and the sustain electrode is set to GND. In this way, the sustain discharge is repeated as many times as desired brightness is obtained.

FIG. 3 shows a change in the drive voltage waveform according to the above drive processing. FIG. 3 shows a first waveform of the driving voltage according to the present invention.

The period ~ shown in FIG. 3 corresponds to the period ~ shown in FIGS.

In FIG. 3, in a period (primary scanning period), the scanning pulse Vw and the data pulse Vd cause the odd-numbered rows of display data to be scanned in a set of two rows in order from the first row. , Display data of odd rows is written. That is, the first line and the second line, the third line and the fourth line, ..., The Sn−1 line and the Sn line form a set, and the display data of the odd lines are simultaneously written.

After that, in the period (scanning erasing period), the first scanning erasing pulse Vwe1 and the second scanning erasing pulse Vw.
The display data of the odd-numbered lines written in the even-numbered lines is erased by using e2 as a trigger.

After that, in the period (secondary scanning period), the display data of even rows is written only to the display cells of even rows by using the scanning pulse Vw as a trigger.

In the writing in the period in this PDP driving method, since the same display data is written in the cells of two rows, the effect that the area of the writing electrode is set to double is obtained. Therefore, the writing discharge is stably generated during the period, and there is an effect that a good display image with little flickering of the display image can be obtained.

As described above, in the initial scanning period, by writing the adjacent cells above or below the selected cells at the same time, when the writing discharge occurs in the adjacent cells before the selected cells, the discharge is generated. The active particles flow into the selected cell and lower the discharge threshold voltage of the selected cell. In other words, the discharge of the adjacent cell can be used as a trigger to instantly generate the write discharge in the selected cell. This is equivalent to doubling the electrode area when writing data.

In the above embodiment, the display data written in the primary scanning period (period) is the display data of the odd rows, but the display data of the even rows may be used. In that case, the odd rows are erased in the periods. The odd-numbered rows are written in the period from. Also, 1 for each subfield or field
The writing data in the next scanning period may be exchanged between odd rows and even rows. This is because it is expected that the effect of the invention can be spread to the whole without being biased to odd-numbered rows and even-numbered rows by exchanging the rows in which the writing characteristics are improved, and a better image display can be obtained.

Since the discharge of the present invention is likely to occur stably in the primary scanning period due to the effect of the present invention, the scanning pulse width and the data pulse width in the primary scanning period are set shorter than those in the other scanning period. You may. The free time obtained by shortening the primary scanning period can be applied to the increase in the number of sustain pulses to increase the brightness, and the writing width of the period can be widened to improve the writing characteristic of the period.

A second embodiment according to the present invention will be described with reference to FIGS. 4 and 5. Compared with the embodiment shown in FIGS. 1 and 2, this second embodiment has
The processing of the period (primary scanning period) is different.

FIG. 4 shows a second charge change state in the display cell according to the present invention. After execution of the period (Figs. 1 and 2
Cell) (cells (112,11)
In 4), the potential difference between the scan electrode and the sustain electrode is reduced by the surface discharge prevention pulse Vcw applied to the sustain electrodes in even rows, and the surface discharge triggered by the counter discharge does not occur, or the discharge intensity of the surface discharge is reduced. Weaken.

As a result, when the display data of the odd-numbered rows A (111, 113) or the even-numbered rows B (112, 114) are written in two consecutive rows in the primary scanning period, they are written in pairs with the cells to be selectively displayed. The light emission of the cell is weakened, making it difficult to visually recognize, and an effect that a better image display can be obtained is obtained.

FIG. 5 shows a second waveform of the driving voltage according to the present invention. In the period shown in FIG. 4, the display data of the odd-numbered rows are scanned in a set of two rows sequentially from the first row. At this time, the surface discharge prevention pulse (Vcw) having the same polarity as the scan pulse is applied to the sustain electrodes in the even rows. The surface discharge prevention pulse is set to a voltage at which a counter discharge does not occur between the data electrode and the sustain electrode even when the data pulse is applied.

Now, a third embodiment of the present invention will be described with reference to FIGS. 6 to 9. FIG. 6 shows a third waveform of the driving voltage according to the present invention. In the period (scanning erase period) shown in FIG. 6, the first sustain pulse is applied to the odd-numbered rows. When the cells of the plasma display panel are driven according to the sequence shown in FIG. 6, 1
For the odd-numbered rows selected in the next scanning period, the time from writing to the first sustain becomes short. By shortening this time, many active particles generated by writing remain in the discharge cell, and the first sustaining discharge is likely to occur. Further, after the first sustaining discharge, more wall charges are formed than after the writing, so that the discharge transition property to the subsequent sustaining is improved, and as a result of stable sustaining discharge, a good display image can be obtained. .

In the third embodiment, it is desirable that the scanning electrodes of adjacent cells are adjacent to each other. Figure 7
The structure of the scanning electrode which concerns on this invention is shown. In the figure, the sustain electrodes C1, C3, ..., Cn-1 are provided above the odd row cells.
However, the scan electrodes S1, S3, ... Sn-1 are arranged below. On the other hand, the scan electrodes S2 and S
4, ... Sn are below the sustain electrodes C2, C4, ...
Cn is arranged.

With this configuration, the period (primary scanning period)
, The scanning electrodes of two lines of cells that are simultaneously selected are adjacent to each other.

The reason why the configuration shown in FIG. 7 is desirable will be described with reference to FIG. FIG. 8 shows a third charge change state in the display cell according to the present invention. In FIG. 8, when the scan electrodes and the sustain electrodes of the cells of two lines that are simultaneously selected in the period (primary scanning period) are adjacent to each other, the odd-row cells A (121, 123) are set in the period (scanning erasing period).
, And the sustain pulse is applied to the sustain electrode to sustain discharge. By this processing, positive wall charges are accumulated on the common electrode, and when a scan pulse is applied to the scan electrode of the even-numbered row cell B (122, 124) during the period (secondary scan period), the positive electrode is connected to the common electrode of the cell A. An erroneous discharge may occur in the scan electrodes of the cell B. This cell A and cell B
The erroneous discharge during the period may cause deterioration of the displayed image, such as the sustain discharge not occurring in the cell A and the erroneous discharge in the cell B.

FIG. 9 shows a charge change state of the display cell having the structure shown in FIG. FIG. 9 shows a fourth charge change state in the display cell according to the present invention. In FIG. 9, by arranging the scanning electrodes of cells of two lines that are simultaneously selected in a period (primary scanning period) so as to be adjacent to each other,
Erroneous discharge between the cells A and B can be prevented even after the sustain discharge in the odd rows in the period (scanning erase period).

Here, a fourth embodiment according to the present invention will be described with reference to FIG. FIG. 10 shows a fourth waveform of the driving voltage according to the present invention. The drive control shown in the figure is characterized by the position of the priming discharge.

During the period, the positive priming pulse Vp + is applied to the scan electrodes in the odd rows and the negative priming pulse Vp- is applied to the sustain electrodes in the odd rows. On the other hand, in even-numbered rows, the first sustaining erase pulse Ve1 and the second sustaining erase pulse Ve2 are applied only to the scan electrodes.
At this time, in the odd rows, priming discharge is generated in all cells, and in the even rows, erase discharge is generated only in the cells selected in the previous subfield and the display data in the previous subfield is reset. Here, although the priming pulse is not applied in the even-numbered rows, the active particles generated by the priming discharge in the odd-numbered rows are also supplied to the upper and lower adjacent cells by diffusion. for that reason,
The writability of the cells in the even rows is not significantly deteriorated as compared with the cells in the odd rows.

Next, in the period (scanning erasing period),
A scan base pulse is applied to the scan electrodes in the odd-numbered cells, a ground potential (GND) is applied to the sustain electrodes, a positive priming pulse is applied to the scan electrodes, and a negative priming pulse is applied to the sustain electrodes in the even-row cells. It At this time, priming discharge is generated in all the cells in the even rows. Therefore, a large number of active particles remain during the period, and writing discharge in even rows can be stably generated. By stabilizing the writing discharge, a good display image without flicker can be obtained.

The present invention is not limited to the above embodiment. In the embodiments, the AC type and the three-electrode surface discharge type plasma display panel has been described as an example, but the present invention can also be applied to the DC type and the two-side electrode surface discharge type plasma display panel. .

[0055]

According to the plasma display panel driving method of the present invention, the stability of the write discharge can be improved. Therefore, it is possible to avoid flickering of the image display.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first charge change state in a display cell according to the present invention.

FIG. 2 is an explanatory diagram of a second charge change state in the display cell according to the present invention.

FIG. 3 is a first waveform diagram of a drive voltage according to the present invention.

FIG. 4 is an explanatory diagram of a second charge change state in the display cell according to the present invention.

FIG. 5 is a second waveform diagram of a drive voltage according to the present invention.

FIG. 6 is a third waveform diagram of a drive voltage according to the present invention.

FIG. 7 is a configuration diagram of a scan electrode according to the present invention.

FIG. 8 is an explanatory diagram of a third electrification change state in the display cell according to the present invention.

FIG. 9 is a diagram for explaining a fourth electrification change state in the display cell according to the present invention.

FIG. 10 is a fourth waveform diagram of a drive voltage according to the present invention.

FIG. 11 is a configuration diagram of a display cell in a three-electrode AC surface discharge PDP.

FIG. 12 is a conceptual diagram of an electrode arrangement of an AC PDP.

FIG. 13 is a first explanatory diagram of a driving operation to which the subfield method is applied.

FIG. 14 is a second explanatory diagram of the driving operation to which the subfield method is applied.

[Explanation of symbols]

101,103,111,113,121,123: Odd row cell A 102,104,112,114,122,124: Even row cell B S: Scan electrode C: sustaining electrode D: Data electrode Vd: Data pulse Vs: sustain pulse Vp +: Positive priming pulse Vp-: negative priming pulse Vpe: priming erase pulse Vbw: Scan base pulse Vw: scan pulse Vcw: Surface discharge prevention pulse Vwe1: 1st scan erase pulse Vwe2: Second scan erase pulse Ve1: first sustaining erase pulse Ve2: Second sustain erase pulse

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-319328 (JP, A) JP-A-10-39834 (JP, A) JP-A-10-63222 (JP, A) JP-A-10- 133621 (JP, A) JP 10-274959 (JP, A) JP 11-65518 (JP, A) JP 11-95722 (JP, A) JP 11-259041 (JP, A) JP 61-205993 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G09G 3/28 G09G 3/20 611 G09G 3/20 622 G09G 3/20 624

Claims (5)

(57) [Claims] 1. A reset period for erasing wall charges to reset display data, and a primary scanning period for writing either odd-row display data or even-row display data to odd-row cells and even-row cells, From either the odd-row cell or the even-row cell,
A scan erase period for erasing the odd-row display data or the even-row display data, the even-row display data is written to the even-row cells from which the odd-row display data has been erased, and the even-row display data has been erased A method of driving a plasma display panel, comprising: a secondary scanning period in which the odd-row display data is written in the odd-row cells, and a sustain period in which a sustain pulse is applied to the odd-row cells and the even-row display cells. 2. The driving method of the plasma display panel according to claim 1, wherein, in the primary scanning period, the sustain electrodes of the odd-row cells or the even-row cells, in which erasing is performed in the scan erasing period, A method of driving a plasma display panel, wherein a surface discharge prevention pulse having the same polarity as a scanning pulse is applied. 3. The driving method of the plasma display panel according to claim 1, wherein a sustain pulse is applied to the odd-row cells or the even-row cells that are not erased in the scan erase period during the scan erase period. Applied plasma display panel driving method. 4. The driving method of the plasma display panel according to claim 1, wherein in the reset period, the odd-row cells or the even-row cells in which erasing is not performed in the scan erasing period are performed. A method of driving a plasma display panel, wherein a priming pulse is applied and an erase pulse is applied to the odd-row cells or the even-row cells in which erase is performed in the scan erase period. 5. The driving method of the plasma display panel according to claim 4, wherein in the scan erasing period, a priming pulse is applied to the odd row cells or the even row cells to be erased in the scan erasing period. Driving method for plasma display panel.