KR20030093127A - Plasma display panel and method for driving the same - Google Patents

Abstract

In the case where the scan pulse width is shortened, the plasma display panel which can be driven without increasing the sustain pulse voltage even when the data pulse of the other scan electrode line is applied after the scan pulse of one scan electrode line is finished. It provides a driving method. A potential fixed electrode is provided at a position opposite to each other via the sustain electrode and the discharge space, and the potential difference between the sustain electrode and the potential fixed electrode between the syringes is equal to or greater than the counter discharge starting voltage when the sustain electrode is the cathode. Also in the conventional three-electrode cell, the potential of the sustain electrode and the data electrode is always equal to or higher than the counter discharge start voltage when the sustain electrode is the cathode during the syringe.

Description

Plasma display panel and method for driving the same

The present invention relates to a plasma display panel and a driving method thereof, and more particularly, to an AC plasma display panel and a driving method thereof.

In recent years, it is well known that information electronic devices based on mobile phones are widely used in the world. Among these information electronic devices, display devices such as wall-mounted televisions and public display boards are also well known.

Moreover, it is also well known that display devices such as wall-mounted televisions and public display panels are attracting attention as plasma display devices.

In general, as a plasma display device, a plasma display panel (hereinafter, abbreviated as PDP) used for wall-mounted televisions, public display panels and the like is well known.

This PDP has a number of features, such as being able to display a large screen relatively easily, having a wide viewing angle, and having a fast response speed.

To this end, as described above, this PDP is used as a plasma display device for a wall-mounted television or a public display panel.

The PDP is a direct current discharge type (DC type) in which an electrode is exposed to a discharge space (discharge gas) and operated in a state of direct current discharge, and the electrode is covered with a dielectric layer and is not directly exposed to the discharge gas. It is divided into AC discharge type (AC type) operated in the state of discharge. In the DC type, discharge occurs during the period in which the voltage is applied. In the AC type, the discharge is continued by inverting the polarity of the voltage. In the AC type, the number of electrodes in one cell is two electrodes or three electrodes.

The structure and driving method of a conventional three-electrode AC plasma display panel will be described. 15 is a cell sectional view showing an example of a conventional plasma display panel.

The AC three-electrode plasma display panel includes a front substrate 20, an orientation substrate 21, a plurality of scan electrodes 22, sustain electrodes 23, and data disposed between the two substrates 20, 21. Each of the electrodes 29, the scan electrodes 22, the sustain electrodes 23, and the data electrodes 29 has a display cell arranged in a matrix form.

Although a glass substrate or the like is used as the front substrate, the scan electrodes 22 and the sustain electrodes 23 are provided at predetermined intervals. The metal electrodes 32 are stacked on the scan electrodes 22 and the sustain electrodes 23 to lower wiring resistance. On these, a protective layer 25 made of a transparent dielectric layer 24 and MgO or the like which protects the transparent dielectric layer 24 from discharge is formed. On the other hand, using the glass substrate or the like as the back substrate 21, the data electrode 29 is provided to be orthogonal to the scan electrode 22 or the sustain electrode 23. In addition, a white dielectric layer 28 and a phosphor layer 27 are provided on the data electrode 29. A well-shaped gap 33 is formed between two glass substrates so as to surround each cell. The partition wall serves to protect the discharge space 26 and partition the pixels. In the discharge space 26, a mixed gas such as He, Ne, and Xe is sealed as the discharge gas.

14 is a plan view of a conventional three-electrode AC plasma display panel. Respective electrodes Ci (i = 1 to m) of the electrode Si and the sustain electrode 23 of the scan electrode 22 and electrodes Dj (j = 1 to n) of the data electrode 29, respectively At each intersection of the display cells 31 are arranged in a matrix.

Next, a driving method of the PDP will be described. Currently, the mainstream is the injection maintenance separation method (ADS method) in which the interval between the syringes and the maintenance period is separated. Hereinafter, the driving method of this scanning holding separation method will be described. 16 is an example of a drive waveform diagram of one subfield (hereinafter abbreviated as SF) of a three-electrode AC plasma display panel. One subfield is composed of three periods: a preliminary discharge period (2), a syringe barrel (3), and a holding period (4).

First, the preliminary discharge period 2 will be described. Before the preliminary discharge period 2, there is a sustain period 1 of the entire subfield, where the amount of formation of wall charges, which are charges generated by discharge on the dielectric layer on each electrode in the cell, differs depending on whether or not sustain discharge is performed. .

If the next recording is performed in this state, the recording discharge may be difficult due to the influence of the different wall charges, or the incorrect recording may be performed. One of the roles of the preliminary discharge period 2 is to initialize and reset the wall charge state, which is the charge generated by the discharge on the dielectric layer in the cell, which is different depending on the lighting state in the sustain period 1 of the entire subfield. . In addition to this, it plays a role of generating a fly effect that makes it easy to discharge when data is recorded in a line sequence based on the display data.

Next, it enters into the syringe barrel 3. The scan base voltage Vbw is about 80 to 110V, and the sustain voltage Vs is about 170V. In the syringe barrel 3, the scanning pulses 6 are sequentially applied to the electrodes S1 to Sm of the scanning electrodes 22. The data pulse 7 is applied to the electrodes D1 to Dn of each of the data electrodes 29 in accordance with the scan pulse 6 in response to the display pattern.

In the pixel to which the data pulse 7 is applied, since a high voltage is applied between the scan electrode 22 and the data electrode 29, after the voltage is applied, the scan electrode is accompanied by some delay (referred to as discharge of the discharge). A write discharge occurs between the 22 and the data electrode 29, and positive wall charges are formed on the scan electrode 22 side. With this discharge, charge transfer occurs between the sustain electrode 23 and the scan electrode 23 which are largely biased to the positive potential, and negative wall charges are formed on the sustain electrode 23.

On the other hand, in the pixel to which the data pulse 7 is not applied, discharge does not occur because the applied voltage is low, and the situation of wall charge does not change. In this way, two types of wall charges can be created depending on the presence or absence of the data pulse (7).

When the application of the scanning pulse 6 to the entire line ends, the process shifts to the holding period 4. The sustain pulses are alternately applied to the former scan electrodes 22 and the former sustain electrodes 23. In the pixel in which no write discharge has occurred, the voltage value Vs of the sustain pulse is set to a voltage at which discharge (called surface discharge) between the scan electrode 22 and the sustain electrode 23 does not start. Here it is 170V.

On the other hand, in the pixel in which the recording discharge has occurred, since the positive wall charges exist on the scan electrode 22 side and the negative wall charges exist on the sustain electrode 23 side, the initial constant sustain pulse applied to the scan electrode 22 (first sustain) Pulses), the positive wall charges are superimposed, a voltage equal to or higher than the discharge start voltage is applied to the discharge space, and sustain discharge is generated. By this discharge, negative wall charges are accumulated on the scanning electrode 22 side, and positive wall charges are accumulated on the sustain electrode 23 side.

The next sustain pulse (referred to as the second sustain pulse) is applied to the sustain electrode 23 side, and since the above wall charges overlap, a sustain discharge also occurs here, and a wall having a polarity opposite to that of the first sustain pulse. Electric charges are accumulated on the scan electrode 22 side and sustain electrode 23 side. The discharge is continuously generated on the same principle and below. The potential difference according to the wall charge generated by the last xth sustain discharge is superimposed on the (x + 1) th sustain pulse and sustain discharge is continued. Luminance luminance is determined by the sustained number of sustain discharges.

The above preliminary discharge period 2, the syringe barrel 3, and the retention period 4 are collectively referred to as a subfield. In the case of performing gradation display, one frame, which is a period for displaying image information of one screen, is composed of a plurality of subfields. The number of sustain pulses in each subfield is changed, and gray scale display can be performed depending on whether each subfield is turned on or off.

In the above-described method for driving a scanning holding separation AC plasma display panel and a plasma display panel, data pulses are sequentially applied in response to an image signal in order to generate a recording discharge in response to an image signal on each scanning line. do.

Therefore, the data electrode potential changes in response to the image signal among the syringes. The wall discharge formed on each electrode by the recording discharge affects the potential of each electrode after the end of the scanning pulse.

Therefore, the wall charges formed on the electrodes vary depending on the application state of the data pulses after the scan electrode lines where the recording discharge is completed. In particular, the case where the scan pulse width is shortened has a large effect. If the panel becomes high precision and the scan pulse width must be reduced in accordance with the increase in the number of scan lines, normally, when the data pulse for generating a discharge discharge is not applied to the next scan electrode line after the application of this scan pulse, Even in operation, when a data pulse is applied, a recording discharge occurs, but a sustain discharge does not occur in the sustain period, and the display becomes adulterous. In order to improve this, the holding pulse voltage must be increased. However, increasing the sustain pulse voltage leads to an increase in power consumption, and an expensive driver with a high breakdown voltage must be used, resulting in an increase in cost.

An object of the present invention is to display a plasma display capable of driving without increasing the sustain pulse voltage even when the data pulse of another scan electrode line is applied after the application of the scan pulse of one scan electrode line after the scan pulse width is shortened. A method of driving a panel and a plasma display panel is provided.

1 is a cross-sectional view of one cell of the plasma display panel of the first embodiment of the present invention;

2 is a plan view of one cell of the plasma display panel according to the first embodiment of the present invention;

3 is a plan view of one cell of the plasma display panel according to the second embodiment of the present invention;

4 is a plan view of one cell of the plasma display panel according to the third embodiment of the present invention;

5 is a plan view of one cell of the plasma display panel of the fourth embodiment of the present invention;

6 is a plan view of one cell of the plasma display panel according to the fifth embodiment of the present invention;

7 is a plan view of one cell of the plasma display panel of the sixth embodiment of the present invention;

8 is a plan view of one cell of the plasma display panel according to the seventh embodiment of the present invention;

9 is a plan view of one cell of the plasma display panel of the eighth embodiment of the present invention;

10 shows driving waveforms of the plasma display panel according to the first embodiment of the present invention;

11 is a view showing another driving waveform of the plasma display panel of the first embodiment of the present invention;

12 shows driving waveforms of a plasma display panel according to a ninth embodiment of the present invention;

13 shows driving waveforms of the plasma display panel according to the tenth embodiment of the present invention;

14 is a plan view of a conventional three electrode AC plasma display panel;

Fig. 15 is a sectional view of one cell of a conventional three electrode AC plasma display panel;

16 is a view showing driving waveforms of a conventional three-electrode AC plasma display panel;

17 shows the relationship between the data electrode potential Vda and the minimum holding voltage Vdsmin after the scanning pulse is finished; And

18 is a view showing Vsw dependency of minimum holding voltage Vdsmin.

<Description of Symbols for Main Parts of Drawings>

1: Preservation period for all subfields 2: Preliminary discharge period

3: Between syringes 4: Maintenance period

5: 1 Subfield 6: Scan Pulse

7: Data pulse 8: Recording wall charge forming pulse

9: holding base voltage

20: upper insulating substrate 21: lower insulating substrate

22 scan electrode 23 sustain electrode

24: transparent dielectric layer 25: protective layer

26: discharge space cell 27: phosphor layer

28 white dielectric layer 29 data electrode

30: display device display screen 31: 1 cell

32 metal drain electrode 33 partition wall

34: potential fixed electrode 35: discharge gap

36: non-discharge gap

In order to solve the above problems, the plasma display panel according to the present invention includes a plurality of electrode pairs in which the scanning electrode and the sustain electrode are arranged in parallel with each other on the first insulating substrate among the two first and second insulating substrates facing each other. And a plurality of data electrodes arranged on a second insulating substrate so as to be orthogonal to the scan electrode and the sustain electrode, wherein a potential fixed electrode is provided at a portion of the second insulating substrate opposite to the sustain electrode on the second insulating substrate. It is characterized by.

At this time, preferably, the potential fixed electrode is characterized in that the electrode shape of the lattice.

Preferably, the line width of the data electrode facing the sustain electrode is narrower than the line width of the data electrode facing the scan electrode.

In addition, preferably, the potential fixed electrode is provided on the data electrode facing the sustain electrode with an insulator layer interposed therebetween.

Preferably, the potential fixed electrode is orthogonal to the data electrode and is provided for each of the sustain electrodes.

In this case, preferably, the potential fixed electrode is characterized in that the line width of the portion of the portion facing the sustain electrode and intersects with the data electrode is narrower than the line width of the other portion.

At this time, preferably, the electrode center line of the portion where the line width of the potential fixed electrode is narrow is discharge discharge gap between the scan electrode and the sustain electrode than the center line of the potential fixed electrode of the other portion of the portion facing the sustain electrode. It is characterized by being in the vicinity.

Further, as a cell structure other than the above, preferably, the potential fixed electrode is formed on the same layer as the data electrode, and the potential fixed electrode has an area of a portion facing the sustain electrode so that the data electrode is connected to the sustain electrode. The area of the potential fixing electrode that is larger than the area of the opposing portion and the potential fixed electrode is larger than the area of the portion where the data electrode opposes the scanning electrode is within one cell. do.

The driving method of the plasma display panel of the present invention is the driving method of the plasma display panel as described above, wherein the syringes for recording data on each scanning electrode in response to an image signal are sequentially arranged on the respective scanning electrodes. Is applied to the pixel, and a signal is written to each pixel by applying a data pulse corresponding to the video signal in synchronization with the scan pulse, and after the scan pulse ends, the sustain electrode and the Counter discharge start voltage when the potential of the data electrode is made higher at the sustain electrode, the potential difference between the sustain electrode and the potential fixed electrode is at a cathode potential between the sustain electrode and the potential fixed electrode. In the above, when the sustain electrode side is at the anode potential between the sustain electrode and the potential fixed electrode, the voltage is lower than the voltage at which no discharge occurs. Is characterized in that to provide a period of opposite wall charge formation for a certain period or more.

In this case, preferably, the predetermined period is within 2 ms.

Further, preferably, the opposite wall charge forming period of the predetermined period or more is characterized in that the 2 ㎲ or more.

In addition, preferably, the potential of the potential fixed electrode is always grounded.

In the plasma display panel driving method, a plurality of electrode pairs in which a scan electrode and a sustain electrode are arranged in parallel with each other on a first insulating substrate are arranged among the first and second insulating substrates facing each other. A method of driving a plasma display panel in which a plurality of data electrodes are arranged on a second insulating substrate so as to be orthogonal to the scan electrodes and sustain electrodes, wherein the data is recorded between the syringes for recording data on each scan electrode in response to an image signal. A signal is written to each pixel by applying scan pulses to the scan electrodes in a linear order and applying a data pulse corresponding to the video signal in synchronization with the scan pulses, and within the predetermined period after the scan pulse ends. The potential of the sustain electrode and the data electrode is made higher at the sustain electrode, and the potential difference between the sustain electrode and the data electrode is scanned at the other scan electrode. Irrespective of the application state of the data pulse applied at the timing at which the voltage is applied, the counter discharge start voltage or more when the sustain electrode side between the sustain electrode and the data electrode is the cathode potential, the sustain electrode and the data electrode The counter wall charge forming period is provided for a predetermined period or more, which is equal to or less than a voltage at which no discharge occurs when the sustain electrode side is brought to the anode potential.

In this case, preferably, the predetermined period is within 2 ms.

Further, preferably, the opposite wall charge forming period of the predetermined period or more is characterized in that the 2 ㎲ or more.

Example

Next, a first embodiment of the present invention will be described in detail with reference to the drawings. 1 shows a cross-sectional view of one cell of the plasma display panel according to the first embodiment of the present invention, and FIG. 2 shows a plan view.

The planar structure of the entire panel has a structure in which the potential fixed electrode 34 is formed in the same direction as the sustain electrode 23 in the plan view of the conventional plasma display panel of FIG.

Regarding the specific size, the case where the cell pitch is 0.27 mm in the lateral direction and 0.81 mm in the longitudinal direction will be described as an example. As the upper and lower insulating substrates 20 and 21, for example, a soda lime glass substrate having a thickness of about 2 to 5 mm is used. The insulating substrate 20 is provided with a scanning electrode 22 and a sustain electrode 23 in the form of a pair of transparent electrodes made of tin oxide or indium oxide, having an electrode width of about 250 to 300 μm, and a discharge gap. Is about 70 to 120 µm. A part of each transparent electrode is provided with a metal electrode 32 to lower the wiring resistance. The dielectric layer 24 is formed on the electrode in the range of about 10 to 50 mu m, and MgO is formed as the protective layer 25 thereon.

On the other hand, in the lower insulating substrate 21, a data electrode 29 is formed of Ag or the like with an electrode width of 100 to 150 mu m. The white dielectric layer 28 is provided thereon. The potential fixed electrode 34 is formed thereon to intersect the data electrode 29 with Ag or the like. The electrode width of the potential fixed electrode 34 is about 100 to 200 m. In addition, the partition 38 is formed on the height of about 100-150 micrometers, and the fluorescent substance 9 is apply | coated last. At this time, if the type of phosphor is divided into RGB (red, green, blue) for each cell, full color display is possible. The two insulating substrates are joined together, and 200 to 600 torr of a mixed gas of He, Ne, and Xe is sealed and discharged as a discharge gas.

Next, a driving method of the plasma display panel of the first embodiment of the present invention will be described. 10 shows a configuration waveform of one subfield. In the present invention, the potential fixed electrode 34 is always set to the ground potential (waveform Fm). The scan electrode waveforms S1 to Sm, the sustain electrode waveforms C1 to Cm, and the data electrode waveforms D1 to Dn in the preliminary discharge period 2 and the sustain period 4 are the same as the conventional drive waveforms of FIG. . In addition, since the fixed potential electrode waveforms F1 to Fm in this period are the same as the data electrode waveforms D1 to Dm, the driving state in this period is considered to be substantially the same as in the prior art.

On the other hand, in the syringe section 3, the data pulse 7 may or may not be applied in response to the video signal. As shown in Fig. 15, in the conventional cell structure, the potential of the data electrode 29 is changed by the application state of this data pulse 26. On the other hand, as in the first embodiment of the present invention, the potential fixed electrode 34 is disposed on the data electrode, and the potential is fixed together with the sustain electrode 23, so that the sustain electrode 23 in the syringe stem 30 The potential difference between the opposite sides of the potential fixed electrode 34 becomes constant.

Next, when the scanning pulse 6 is applied, the data charge 7 is applied and the wall charge forming state when the recording discharge has occurred will be described. In the opposite discharge space between the scan electrode 22 and the data electrode 29, the scan electrode 22 is used as the cathode, including the wall voltage which is a voltage caused by wall charges in addition to the voltage applied from the outside. The counter discharge start voltage, which is the minimum voltage at which discharge occurs between and (hereinafter, unless otherwise specified, the scan electrode 22 or sustain electrode 23 is a cathode, and the data electrode on the opposing substrate (29) or a voltage exceeding the minimum voltage applied to the discharge space in which the discharge occurs between the potential fixed electrodes is simply called the counter discharge start voltage, is applied to the counter discharge space, whereby the scan electrode 22 and the data electrode ( 29) discharge occurs. Because of this discharge, a large amount of space charges are generated in the discharge space, so that discharge is generated between the other electrodes in the cell as a trigger and charges are collected by the electric field to form wall charges. Here, considering the case where the width of the scanning pulse 6 is short and the discharge pulse is substantially generated within the scanning pulse 6 period, the amount of wall charge formation greatly affects the electrode potential after the completion of the scanning pulse 6. Receive. In the case where a strong discharge such as a recording discharge occurs, it is possible to form a wall voltage approximately equal to the voltage applied from the outside, even though it is caused by the discharge location and the position of the electrode.

Therefore, in the driving waveform of the conventional plasma display device shown in FIG. 16, a wall voltage of approximately (Vs-Vbw) is formed between the scan electrode 22 and the sustain electrode 23. FIG. On the other hand, it can be considered that the wall voltage formed between the sustain electrode 23 and the data electrode 29 changes depending on the presence or absence of the data pulse 7 at the time of writing the next scan line. When the data pulse 7 is applied, the wall voltage of approximately (Vs-Vd) is formed on the sustain electrode 23 and the data electrode 29. When the data pulse is not applied, the wall voltage of about Vs is formed. .

Due to this difference, the intensity of the sustain discharge (referred to as the first holding) due to the minimum holding pulse in the holding period 4 is different, and is formed between the scanning electrode 22 and the holding electrode 23 according to the first holding. Wall charge varies.

This is because when the wall voltage becomes Vs and the sustain electrode 23 and the data electrode 29 are commonly grounded in addition to the surface discharge generated between the scan electrode 22 and the sustain electrode 23 in the first holding state. This is because a weak counter discharge occurs between the sustain electrode 23 and the data electrode 29 by the wall voltage. On the other hand, in the case of Vs-Vd, since the potential difference is small, approximately this weak opposite discharge does not occur, and the sustain discharge becomes weak and the sustain discharge is not stably sustained by the subsequent sustain pulse.

In FIG. 17, the minimum holding voltage Vdsmin when the data electrode potential Vda after the completion of the scanning pulse 6 is simulated is shown by "o". As the minimum holding voltage Vdsmin, it is the minimum holding voltage Vs that can be displayed normally. The scanning pulse width is 1 Hz.

In Fig. 17, when Vda = 0 V, data pulses are not applied at the next scan line write. On the other hand, when the data pulse voltage Vd is 65V, the case where Vda = 65V is the case where the data pulse is applied at the time of writing the next scan line. When the data pulse is applied, the rise of the minimum holding voltage Vdsmin of about 6V can be seen compared with the case where the data pulse is not applied.

In contrast, in the plasma display panel according to the first embodiment of the present invention, the potential difference between the sustain electrode 23 and the potential fixed electrode 34 is always fixed to the wall voltage Vs between the syringe barrels 3. For this reason, approximately Vs wall voltage is formed between the sustain electrode 23 and the potential fixed potential 34 by the write discharge.

Thus, by providing the potential fixed electrode 34, even if the potential of the data electrode 29 varies with or without the data pulse, the potential between the counter electrode of the sustain electrode 23 and the potential fixed electrode 34 is constant. As a result, a certain amount of wall voltage can be formed. In Fig. 17, the dependence of the data electrode potential Vda after the completion of the scan pulse of Vdsmin is indicated by?. As can be seen from the figure, even if the data electrode potential Vda rises after the end of the scan pulse, Vdsmin does not rise as in the conventional case indicated by " 0 ".

In addition, when the driving waveform of FIG. 10 is used as shown in FIG. 11 and the potential of the sustain electrode 23 in the syringe barrel 3 is set to a voltage Vsw higher than the sustain voltage Vs, Vdsmin can be further lowered. In particular, the voltage Vsw is set to be equal to or greater than the counter discharge start voltage between the sustain electrode 23 and the potential fixed electrode 34 when the sustain electrode 23 is a cathode. The counter discharge start voltage here may be regarded as a voltage at which discharge starts when a voltage equal to or greater than the voltage is applied between the counter electrodes in a state where no wall charge is formed.

This counter discharge start voltage varies greatly depending on the polarity of the applied voltage. On the dielectric layer of the sustain electrode 23, an MgO film is formed as the protective layer 25. When the side on which the protective layer is formed is a cathode, secondary electrons are emitted by the collision of electrostatic charges, and new electrons are supplied to the discharge space. And the discharge is maintained at a low voltage.

On the other hand, if there is no MgO layer on the cathode side, there is no supply of new secondary electrons, so that discharge is not maintained unless a high voltage is applied. Therefore, even when the voltage Vsw is set to the counter discharge start voltage between the sustain electrode 23 and the potential fixed electrode 34 when the sustain electrode 23 is the cathode, misdischarge is generated between the syringes 3. Otherwise, no discharge occurs unless a write discharge occurs.

In practice, in the syringe barrel 3, the sustain electrode 23 and the potential fixed electrode 34 are approximately equal to the position away from the discharge gap in which the sustain discharge occurs between the scan electrode 22 and the sustain electrode 23. Since the wall voltage is formed and the potential difference in the opposite discharge space is considered to be the highest, the opposite discharge starts between the sustain electrode 23 and the potential fixed electrode 34 when the sustain electrode 23 is the cathode. When set below the voltage, no discharge occurs.

After the occurrence of the recording discharge, the sum of the wall voltages formed on the sustain electrode 23 and the potential fixed electrode 34 is approximately equal to the potential difference between the electrodes. Therefore, by setting the voltage Vsw as described above, the sum of the wall voltages formed on the sustain electrode 23 and the potential fixed electrode 34 after the recording discharge is approximately the sustain electrode 23 and the potential fixed electrode 34. It is possible to set the potential difference between the two electrodes to be equal to or greater than the counter discharge start voltage between the sustain electrode 23 and the potential fixed electrode 34 when the sustain electrode 23 is the cathode.

In the state where such wall voltage is formed, in the first holding period in the sustaining period 4, the potential on the low potential side of the sustaining electrode 23 and the potential of the potential fixed electrode 34 are made equal to the wall voltage in this opposing space. A wall charge of (Vsw) is applied.

Since the wall voltage Vsw is equal to or lower than the counter discharge starting voltage between the sustain electrode 23 and the potential fixed electrode 34 when the sustain electrode 23 is used as the cathode, the opposite discharge is reliably maintained in the first holding. Occurs. In this manner, in addition to the occurrence of the surface discharge between the scan electrode 22 and the sustain electrode 23, the opposite discharge is reliably generated in the first holding, so that the discharge intensity is increased, and the sufficient wall charge amount is sufficient for the scan electrode 22. Is formed on the sustain electrode 23, and sustain discharge is reliably sustained by the sustain pulses below or below.

The minimum sustain voltage Vdsmin of the first embodiment of the present invention is indicated by "# " in FIG. It is not affected by the data electrode potential Vda after the end of the scanning pulse, and becomes constant Vdsmin with respect to Vda, and the voltage is significantly lower than that of the conventional Vdsmin. This is because Vsw is equal to or greater than the counter discharge start voltage between the sustain electrode 23 and the potential fixed electrode 34 when the sustain electrode 23 is the cathode.

The period which is equal to or greater than the counter discharge start voltage does not necessarily have to be in the entire period between the syringes 3. Even when the voltage before scanning pulse was applied to Vs, the same Vdsmin characteristics were obtained. In addition, since the potential of the sustain electrode 23 is pulled from Vsw to Vs after 10 ms or more from the end of the application of the scanning pulse, there is no influence. On the other hand, from 2 V or more after the end of the scanning pulse, even if the sustain electrode potential is pulled from Vs to Vsw, Vdsmin becomes 170V, and the effect of pulling down the voltage Vsw cannot be obtained. For example, even if the sustain electrode potential is lowered to the voltage Vsw within 2 kV after the application of the scanning pulse, the effect is extremely weak unless the Vsw potential is continued for 2 kV or more. did.

As described above, when the first embodiment of the present invention is used, not only is it affected by the presence or absence of data pulses, but also the sustain electrode 23 when the sustain electrode 23 is the cathode as the voltage Vsw. By setting the discharge discharge voltage between the potential fixed electrodes 34 or more, the minimum holding voltage Vdsmin can be significantly reduced, and a low breakdown voltage holding driver can be used even when the scan pulse width is short.

Next, specific setting values of the voltage will be described. First, when the sustain period 1 of the entire subfield is completed, the preliminary discharge period 2 is established. The waveform here was basically the same as the conventional waveform of FIG. 16, and set Vs to 160V and Vp to 380V. The slope of each crater wave was about 50 mm wide. The preliminary charging period 2 is a period for resetting charges (wall charges) accumulated on the dielectric layer by sustain discharge of all SFs, and generating a fly discharge to facilitate recording discharge. Mainly, the wall charges formed during the holding period in the first stationary wave are reset, and a fly discharge is generated in the following two stationary wave, and then the wall charges generated by the fly discharge are adjusted.

Next, it moves to the syringe barrel 3. In the scan electrode 22, the scan base voltage Vbw is applied, and the pulses 6 are sequentially applied in line order. The scan base voltage (Vbw) was about 110V, the scan pulse width was 1 kHz, and the potential was GND. The potential of the sustain electrode 23 is fixed at Vsw. The potential fixed electrode 34 is grounded. Here, the counter discharge start voltage of the present cell was 185V between the scan electrode 22 and the data electrode 29 and between the sustain electrode 23 and the potential fixed electrode 34. 18 shows the dependence of the voltage Vsw of the minimum holding voltage Vdsmin.

It can be seen that when the voltage Vsw is set to 185V or more, the minimum holding voltage Vdsmin rapidly decreases. In the first embodiment of the present invention, the voltage Vsw is set to 190 to 210V so that the voltage Vsw is equal to or greater than the counter discharge start voltage.

Finally, it enters the holding period (4). This is the same as the conventional one, and only when the recording discharge occurs between the syringes 3, since a large wall charge is formed in the vicinity of the surface discharge gap between the scanning electrode 22 and the sustaining electrode 23, the sustaining discharge is generated and turned on. It is in a state. In this way, lighting and non-lighting can be controlled. The voltage of the sustain pulse is set to Vs = 160V.

Next, a second embodiment of the present invention will be described with reference to the cell plan view of FIG. The drive waveform of the second embodiment of the present invention is the same as the drive waveform of the first embodiment of the present invention.

In the first embodiment of the present invention, the data electrode 29 and the potential fixed electrode 34 have a large area of opposing portions via the dielectric layer 28, and the capacitance between these electrodes becomes large, and thus the data electrode Reactive power caused by a change in potential becomes large, and heat generation of the data driver becomes a problem.

In the second embodiment of the present invention, the capacitance between the data electrode 29 and the potential fixed electrode 34 is reduced, and the discharge is reliably generated in relation to the recording discharge.

In the cell structure of the second embodiment of the present invention, the shape of the data electrode 29 is narrowed at the portion facing the potential fixed electrode 34 and wide at the portion facing the scan electrode 22. It is the same as that of the 1st Example of this invention. The area of the portion where the sustain electrode 23 and the potential fixed electrode 34 face each other is the same as that of the first embodiment of the present invention, and Vdsmin has the same value as that of the first embodiment of the present invention.

The line width of the data electrode 29 was 40 to 80 mu m in the portion facing the potential fixed electrode 34, and 120 to 170 mu m in the portion facing the scanning electrode 22. As shown in FIG. By doing in this way, the capacitance between the potential fixed electrode 34 and the data electrode 29 can be reduced, the reactive current can be reduced, power consumption can be reduced, and heat generation can be suppressed. In addition, since the area of the data electrode 29 facing the scan electrode 22 is large, the probability of recording discharge can be increased, and the discharge delay can be reduced.

Next, a third embodiment of the present invention will be described with reference to the cell plan view of FIG. The drive waveform of the third embodiment of the present invention is the same as that of the first embodiment of the present invention.

The cell structure of the third embodiment of the present invention is the same as the second embodiment of the present invention except that the line width of the potential classical electrode 34 is thinned and provided near the discharge gap. In the transition to sustain discharge, the state of formation of wall charges near the discharge gap during recording discharge becomes important. In order to reduce the capacitance of the data electrode 29 and the sustain electrode 23, the line width of the potential fixed electrode 34 is as narrow as possible, and between the sustain electrode 23 and the potential fixed electrode 34 near the discharge gap are opposed. In order to form a desired wall voltage, the electrode position is set near the discharge gap. The width of the potential fixed electrode 34 was about 40-50 micrometers. Even in such a structure, Vdsmin almost identical to that of the second embodiment of the present invention was obtained. In addition, the reactive current can be reduced, thereby reducing the power consumption.

The cell structure of the fourth embodiment of the present invention is the same as that of the third embodiment of the present invention except that an electrode having the same line width as that of the potential fixed electrode 34 of the third embodiment of the present invention is added as the potential fixed electrode. same. The distance between the two potential fixed electrodes 34 was about 40 to 60 mu m.

In this way, by adding the electrodes, the line capacitance of the data electrode 29, the sustain electrode 23, and the potential fixed electrode 34 is increased and separated into two, so that the line capacitance is larger than that of the second embodiment of the present invention. This is small.

On the other hand, by adding another potential fixed electrode 34, the accumulated state of the wall charges could be effectively the same as that of the single electrode on the front surface without slit interposed therebetween.

Thus, the discharge in the first holding was stronger and more reliable than the third embodiment of the present invention. In the conventional cell or the third embodiment of the present invention, in the sustain discharge, from the first holding to the ten holding pulses, the discharge is weaker than the sustain discharge in the second sustaining period 4, and is in an unstable state.

On the other hand, as in the fourth embodiment of the present invention, by adding another potential fixed electrode 34, sustain discharge of intensity close to the normal sustain discharge can be generated from the first hold. In this way, the stable discharge can be achieved from the first holding, so that the Vdsmin value can be obtained exactly the same as the second embodiment of the present invention, and the number of holding pulses is small, and stable display is possible even in the sub-fields of the lower gradations. You can get it.

Next, a fifth embodiment of the present invention will be described with reference to the cell plan view of FIG. In the fifth embodiment of the present invention, the capacitance between the data electrode 29, the sustain electrode 23 and the potential fixed electrode 34 is kept low, while the area of the effective fixed electrode 34 is widened and maintained. The wall charge formed between the electrode 23 and the potential fixed electrode 34 is different from the fourth embodiment of the present invention in which the wall charges can be formed up to a region separated from the discharge gap.

The drive waveform of the fifth embodiment of the present invention is the same as that of the first embodiment of the present invention. The cell structure of the fifth embodiment of the present invention is the same as that of the second embodiment of the present invention except that the line width of the portion where the shape of the potential fixed electrode 34 intersects the data electrode 29 is narrowed. In this way, the area of the intersection portion is made small so as to reduce the capacitance between the potential fixed electrode 34 and the data electrode 29. The narrow portion is approached near the surface discharge gap, and wall charges formed between the sustain electrode 23 and the potential fixed electrode 34 are formed as close to the discharge gap as possible during writing. The width of the potential fixed electrode 34 was set to about 100 to 200 탆 in a wide portion, and about 50 탆 in a narrow portion that is an intersection portion. In this embodiment, almost the same Vdsmin as in the fourth embodiment of the present invention can be obtained. In addition, the number of sustain pulses was small, and the subfields of the lower gradations could be displayed stably.

Next, a sixth embodiment of the present invention will be described with reference to the cell plan view of FIG. The sixth embodiment of the present invention is also different from the fourth and fifth embodiments of the present invention in which wall charges can be formed on the entire surface facing the sustain electrode 23 while suppressing the inter-electrode capacitance small. .

The drive waveform of the sixth embodiment of the present invention is the same as that of the first embodiment of the present invention. The cell structure of the sixth embodiment of the present invention is the same as that of the second embodiment of the present invention except that the potential fixed electrode 34 has a mesh shape.

By forming the mesh in this manner, the area of the intersection portion is reduced, and the capacitance between the potential fixed electrode 34 and the data electrode 29 and the capacitance between the potential fixed electrode 34 and the sustain electrode 23 are reduced. The line width of the mesh shape is about 10 to 40 mu m and the hole portion of the mesh shape is about 40 to 50 mu m.

By using such a mesh-shaped electrode, the capacitance decreases, but when the hole portion is about 50 µm or less, the extended state of the discharge due to the recording discharge has the shape of the potential fixed electrode 34 as in the second embodiment of the present invention. Almost the same state as that having a large electrode area was obtained. By such a mesh electrode structure, the line capacitance was kept low, and the same Vdsmin and sustain discharge stability as in the fifth embodiment of the present invention were obtained.

Next, a seventh embodiment of the present invention will be described with reference to the cell plan view of FIG. The drive waveform of the seventh embodiment of the present invention is the same as that of the first embodiment of the present invention.

The cell structure of the seventh embodiment of the present invention is the same as that of the second embodiment of the present invention except for the potential fixed electrode 34. When the data electrode 29 is formed, the same structure as the data electrode 29 is obtained. A potential fixed electrode 34 is formed in the layer.

Therefore, the terminal take-out of the potential fixed electrode 34 is the same as that of the data electrode 29, and becomes the up and down direction in FIG. With this structure, the potential solid electrode 34 and the data electrode 29 can be formed at once, and the potential fixed electrode 34 can be added without increasing the number of steps.

The line width of the data electrode 29 is thinned to about 50 占 퐉 at the portion facing the sustain electrode 23. The potential fixed electrode 34 is formed so that the distance from the data electrode 29 is about 30 mu m. As a result, the potential fixed electrode 34 can be made larger than the data electrode 29 in the area of the portion facing the sustain electrode 23. As a result, it is possible to suppress voltage fluctuations in the opposite discharge space due to the potential fluctuations of the data electrodes 29. As a result, the same minimum holding voltage Vdsmin characteristic as in the first embodiment of the present invention was obtained.

Next, an eighth embodiment of the present invention will be described with reference to the cell plan view of FIG. The drive waveform of the eighth embodiment of the present invention is the same as that of the first embodiment of the present invention.

The cell structure of the eighth embodiment of the present invention is the same as that of the seventh embodiment of the present invention except for the shape of the potential fixed electrode 34 and the shape of the data electrode 29, and the same as that of the seventh embodiment of the present invention. When forming the data electrode 29, the potential fixed electrode 34 is formed on the same layer as the data electrode 29. The line widths of the scan electrodes 22 and sustain electrodes 23 taper the portions where the partition walls 33 intersect.

This is for reducing the capacity of the data electrode 29 or the potential fixed electrode 34, and this can also be applied to the first to fifth embodiments of the present invention. In the discharge space portion of the cell, the sustain electrode 23 faces only the potential fixed electrode and can reliably eliminate the influence of the data electrode potential than in the seventh embodiment of the present invention.

Next, a ninth embodiment of the present invention will be described with reference to the drive waveform of FIG. The drive waveform of the ninth embodiment of the present invention can be applied to any one of the first to eighth embodiments of the present invention.

The driving waveform sets the potential of the potential fixed electrode 34 while reducing the number of power source potentials of the sustaining electrode 23 by making the potential of the sustaining electrode 23 of the syringe barrel 3 equal to the sustain pulse voltage. It is negative potential. Here, the potential Vfw of the potential fixed electrode 34 is set such that the potential difference between the sustain electrode 23 and the potential fixed electrode 34 is equal to or greater than 185 V, the counter discharge start voltage.

Specifically, the sustain pulse voltage (Vs) was set to 160V, and the potential (Vfw) was set to -30 to -60V. By doing in this way, the wall voltage of approximately (Vs-Vfw) can be formed between the sustain electrode 230 and the potential fixed electrode 34 at the time of writing, similarly to the driving waveform of FIG. The opposite discharge can be caused between the electrodes, so that the same minimum holding voltage Vdsmin as shown in FIG. 8 can be obtained.

Next, a tenth embodiment of the present invention will be described with reference to the drive waveform of FIG. The cell structure of the tenth embodiment of the present invention is the same as that of the conventional cell structure. The counter discharge start voltage of the cell of the tenth embodiment of the present invention is 185V. The waveform of the sustain period 4 of the drive waveform of the tenth embodiment of the present invention is the same as the conventional drive waveform.

The voltage Vsw of the sustain electrode 23 between the syringes 3 is such that the voltage applied between the sustain electrode 23 and the data electrode 29 becomes equal to or greater than the counter discharge start voltage even when the data pulse 7 is applied. Increase Vsw. When the potential of the sustain electrode 23 is increased in this manner, a high voltage Vsw is applied between the scan electrode 22 and the sustain electrode 23 at the timing when the scan pulse 6 is applied.

In the tenth embodiment of the present invention, even when such a high voltage is applied when the scanning pulse is applied, the scan electrode (2) in the preliminary discharge period (2) so that no mis-discharge occurs between the scan electrode (22) and the sustain electrode (23). The wall charge in the vicinity of the discharge gap is adjusted between 22) and sustain electrode 23.

The driving waveform of the preliminary discharge period 2 of the tenth embodiment of the present invention has a potential difference of v between the scan electrode 22 and the sustain electrode 23 immediately before the time period 3 as compared with the conventional drive waveform of FIG. It is designed to have a high potential difference at Vsw. In the preliminary discharge period 2, when a Vp voltage is applied to the scan electrode 22, a large negative wall voltage is formed on the scan electrode 22, and a positive wall voltage is formed on the sustain electrode 23. Can be.

Thereafter, the polarities of the electrode potentials of the scan electrode 22 and the sustain electrode 23 are reversed, and the potential of the scan electrode 22 is gradually lowered, thereby weakening the gap between the scan electrode 22 and the data electrode 29. At the same time as continuous discharge (referred to as weak discharge) occurs, weak discharge is also generated between the scan electrode 22 and the sustain electrode 23.

By the weak discharge between the scan electrode 22 and the sustain electrode 23, the negative wall voltage of the scan electrode 22 in the vicinity of the surface discharge gap is reduced, and a negative wall voltage is formed on the sustain electrode 23 side. At this time, by increasing the final reaching potential difference of the ramp waveform Vsw, the subwall voltage of the scan electrode 22 is further reduced, and the subwall voltage of the sustain electrode 23 is increased. By making the subwall voltage of the sustain electrode 23 near the discharge gap larger than the subwall voltage of the scan electrode 22, the voltage applied to the surface discharge space of the scan electrode 22 and the sustain electrode 23 can be made smaller than Vsw. .

In the tenth embodiment of the present invention, mis-discharge when scanning pulses are applied in this way is prevented. The ramp waveform applied to the scan electrode 22 is a waveform which is directly lowered from the Vp voltage as the Vsw is applied to the sustain electrode 23 and the potential of the scan electrode 22 is lowered at the same time as the scan electrode 22 is applied. This is to prevent erroneous discharge of the surface of the sustain electrode 23.

Specifically, the set voltage of the driving waveform is as follows. The sustain pulse voltage was 160V and the data pulse voltage was 65V. The potential Vsw of the sustain electrode 23 of the syringe barrel 3 is set to 250 to 270 V so that the potential difference between the sustain electrode 23 and the data electrode 29 becomes equal to or greater than the counter discharge start voltage even when the data pulse 6 is applied. It was.

As a result, a voltage of 185 V to 205 V is applied between the sustain electrode 23 and the data electrode 29 even when a data pulse of 65 V is applied.

If no data pulse is applied, a voltage of 250V to 270V is applied. Therefore, in either case, a wall voltage equal to or greater than the counter discharge start voltage is substantially formed by the recording discharge, and the counter discharge occurs at the first holding.

Since the counter discharge start voltage when the sustain electrode 23 side is the anode is about 350 V, even if a voltage of this level is applied, if a discharge discharge does not occur, a discharge is performed between the sustain electrode 23 and the data electrode 29. This does not happen. The period which is equal to or greater than the counter discharge starting voltage does not necessarily have to be the entire period of the syringe barrel 3. Even when the voltage before scanning pulse was applied to Vs, the same Vdsmin characteristics were obtained. In addition, there is no influence even if the potential of the sustain electrode 23 is pulled from the voltage Vsw to the voltage Vs after 10 ms or more after the application of the scanning pulse.

On the other hand, even if the sustain electrode potential is pulled from the voltage Vs to the voltage Vsw from 2 ms or more after the end of the scan pulse, Vdsmin becomes 170V, and the effect of pulling up the voltage Vsw is not obtained. For example, even if the sustain electrode potential is raised to Vsw within 2 ms after the end of the application of the scanning pulse, the effect is extremely weak unless the Vsw potential is continued for 2 ms or more, and it is almost impossible to bring down Vdsmin.

By using such a waveform, even in the conventional cell structure without the potential fixed electrode 34, the same Vdsmin characteristic as in the first embodiment of the present invention can be obtained.

As described above, according to the present invention, the minimum holding voltage Vdsmin that can be driven normally even when the scanning pulse is shortened can be reduced. Specifically, when the scan pulse is shortened to 1 ms, the sustain pulse voltage must be raised to 176 V at the minimum, considering that the data pulse is applied after the conventional scan pulse is terminated. However, the plasma display panel and the driving method of the present invention are used. In this case, it was possible to lower the sustain pulse voltage to 143V.

Claims (17)

Of the two first and second insulating substrates facing each other, a plurality of electrode pairs in which scan electrodes and sustain electrodes are arranged in parallel with each other are disposed on the first insulating substrate, and the scan electrodes and sustain electrodes are disposed on the second insulating substrate. In a plasma display panel in which a plurality of data electrodes are arranged to be orthogonal, And a potential fixed electrode on a portion of the second insulating substrate that is opposite to the sustain electrode. The plasma display panel as claimed in claim 1, wherein the potential fixed electrode has a lattice shape of an electrode. The plasma display panel of claim 1 or 2, wherein a line width of the data electrode facing the sustain electrode is smaller than a line width of the data electrode facing the scan electrode. The plasma display panel according to any one of claims 1 to 3, wherein the potential fixed electrode is provided on the data electrode facing the sustain electrode with an insulator layer interposed therebetween. The plasma display panel of claim 4, wherein the potential fixing electrode is perpendicular to the data electrode and is provided for each of the sustain electrodes. 6. The plasma display panel of claim 5, wherein the potential fixed electrode has a line width of a portion of the portion opposite to the sustaining electrode that intersects with the data electrode is smaller than that of another portion. 7. The discharge gap between the scan electrode and the sustain electrode according to claim 6, wherein an electrode center line at a portion where the line width of the potential fixed electrode is narrow is smaller than a center line of the potential fixed electrode at another portion of the portion facing the sustain electrode. Plasma display panel in the vicinity. The method of claim 1, wherein the potential fixed electrode is formed on the same layer as the data electrode, The area of the potential fixed electrode that is opposite to the sustain electrode is larger than the area of the portion where the data electrode faces the sustain electrode in one pixel, And the area of the potential fixed electrode facing the scan electrode is greater than one area of the area where the data electrode faces the scan electrode. In the driving method of a plasma display panel, Scanning pulses are sequentially applied to the respective scanning electrodes in sequence between the syringes recording data on each scanning electrode in response to the video signal, A signal is recorded in each pixel by applying a data pulse corresponding to the video signal in synchronization with the scanning pulse, After the end of the scanning pulse, the potential of the sustain electrode and the data electrode is increased to the sustain electrode within a predetermined period. The potential difference between the sustain electrode and the potential fixed electrode is equal to or greater than the counter discharge start voltage when the sustain electrode side between the sustain electrode and the potential fixed electrode is the cathode potential, and is formed between the sustain electrode and the potential fixed electrode. A method of driving a plasma display panel, wherein a counter wall charge forming period is provided for a predetermined period or more, which is equal to or less than a voltage at which discharge does not occur when the sustain electrode is at the anode potential. The method of driving a plasma display panel according to claim 9, wherein the predetermined period is within 2 ms. The method of driving a plasma display panel according to claim 9 or 10, wherein the opposite wall charge forming period of the predetermined period or more is 2 mW or more. The method of driving a plasma display panel according to claim 9, 10 or 11, wherein the potential of the potential fixed electrode is always grounded. Of the two first and second insulating substrates facing each other, a plurality of electrode pairs in which scan electrodes and sustain electrodes are arranged in parallel with each other are disposed on the first insulating substrate, and the scan electrodes and sustain electrodes are disposed on the second insulating substrate. In a driving method of a plasma display panel in which a plurality of data electrodes are arranged to be orthogonal to each other, Scan pulses are sequentially applied to the respective scan electrodes in a line order between the syringes that record data for each scan electrode in response to the video signal, A signal is recorded in each pixel by applying a data pulse corresponding to the video signal in synchronization with the scanning pulse, After the end of the scanning pulse, the potential of the sustain electrode and the data electrode is increased to the sustain electrode within a predetermined period. The sustain electrode side between the sustain electrode and the data electrode is connected to the potential difference between the sustain electrode and the data electrode regardless of the state in which the data pulse is applied at the timing when the scan pulse is applied to another scan electrode. A counter wall charge formation period of at least a certain period is set to be equal to or greater than a counter discharge start voltage at the time of the cathode potential and below a voltage at which the discharge does not occur when the sustain electrode side is the anode potential between the sustain electrode and the data electrode. A method of driving a plasma display panel. The method of driving a plasma display panel according to claim 13, wherein the predetermined period is within 2 ms. 15. The method of driving a plasma display panel according to claim 13 or 14, wherein the opposite wall charge forming period of the predetermined period or more is 2 mW or more. The AC discharge type plasma display panel according to any one of claims 1 to 8, wherein the electrode is covered with a dielectric layer and is not directly exposed to the discharge gas, and is operated in an AC discharge state. The method of driving an alternating current discharge plasma display panel according to any one of claims 9 to 15, wherein the electrode is covered with a dielectric layer and is not directly exposed to the discharge gas, and is operated in a state of alternating current discharge.