JP2005249949A - Method for driving plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an error in address discharge by continuously or intermittently causing micronic discharge at a nearby cell and supplying a priming particle to an object cell to be addressed when scanning pulses are applied in an address period. <P>SOLUTION: When scanning pulses are applied to a display electrode one after another in the address period, display lines are divided into two groups of odd-numbered display lines and even-numbered display lines and a scanning voltage is applied, group by group. At this time, when the scanning voltage is applied to display electrodes of display lines in one of the odd-numbered or even-numbered groups one after another, the voltage is applied to display electrodes of display lines of the other group so that micronic discharge is continuously or intermittently applied in cells of the display lines. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a driving method of a plasma display panel (hereinafter referred to as “PDP”), and more particularly, to a driving method of a PDP for ensuring address discharge.

  As the PDP, an AC type three-electrode surface discharge type PDP is widely known. In this PDP, a large number of display electrodes capable of surface discharge are provided in the horizontal direction on the inner side surface of the front side (display side) substrate, and a number of address electrodes cross the display electrodes on the inner side surface of the rear side substrate. The intersection of the display electrode and the address electrode is used as a cell. In the present specification, among the display electrodes, an electrode used for scanning (scanning) will be described as a Y electrode, and the other electrodes will be described as an X electrode.

  In a PDP having this structure, display is performed by a method generally called an address / display separation drive (ADS drive) method for gradation display. In other words, one frame is divided into a plurality of weighted subfields (hereinafter also referred to as “SF”), and for each subfield, an initialization period for equalizing the charge of all cells and a cell to emit light are selected. And a sustain period during which the selected cell emits light (also referred to as a display period or a sustain period).

In the initialization period, a reset voltage is applied between all X electrodes and Y electrodes to equalize the charges in all cells.
In the address period, a scanning voltage (scanning pulse) is sequentially applied using the Y electrode as a scanning electrode, and an address voltage is applied to a desired address electrode in the meantime, and an address discharge is generated between the Y electrode and the address electrode. The wall charges are accumulated in the cells to be generated and emit light.

  In the sustain period, a sustain voltage is alternately applied to the X electrode and the Y electrode, and a sustain discharge is generated between the XY electrodes by the number of times of weighting.

  By performing these initialization operation, address operation, and maintenance operation, one subfield is completed, one subframe is displayed by repeating these subfields, and a video is displayed by continuing the display of this one frame. (See Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 4-195188 JP-A-6-186927

  As the scanning pulse applied in the address period, a rectangular wave voltage pulse is generally used. Therefore, an address period of one subfield requires a time of scan pulse width × number of scan electrodes.

  Incidentally, in order to increase the definition of the PDP, it is necessary to increase the number of scanning electrodes (the number of display lines). Further, in order to improve the gradation expression capability, it is necessary to increase the number of subfields.

  However, increasing the number of scan electrodes or increasing the number of subfields leads to an increase in the address period. This increase in the address period causes a decrease in the sustain period, resulting in a decrease in luminance. Therefore, it is necessary to reduce the width of the scan pulse.

  However, in general, discharge occurs after a certain amount of time called discharge delay has elapsed after a voltage is applied between the electrodes. For this reason, when the width of the scan pulse is reduced, sufficient wall charges are not formed in the cell due to the discharge delay of the address discharge, which becomes an address discharge error and a display error.

  Such address discharge mistakes frequently occur in cells where neighboring cells do not emit light or cells that do not emit light in the previous subfield period. The cause is considered to be a decrease in priming particles.

  The present invention has been made in consideration of such circumstances, and when a scan pulse is applied during an address period, a minute discharge is generated continuously or intermittently in neighboring cells, so that the cells to be addressed are addressed. An object of the present invention is to prevent address discharge mistakes by supplying priming particles.

  In the present invention, a plurality of display electrodes are provided in parallel between a pair of substrates, a plurality of address electrodes are provided in a direction intersecting with the display electrodes, and light is emitted from the intersection between the display line between the display electrodes and the address electrode as a cell. When a screen is displayed, a frame is composed of a plurality of subfields, and each subfield has at least an address period for selecting a cell to emit light, and a selected cell. A sustain period for causing light emission, and in the address period, a scanning voltage is sequentially applied to the display electrode, and a voltage is applied to a desired address electrode in the meantime to generate an address discharge. Driving a plasma display panel that accumulates and displays a screen by generating a sustain discharge between display electrodes during the sustain period When the scanning voltage is sequentially applied to the display electrodes in the address period, the display lines are divided into a plurality of groups and the scanning voltage is sequentially applied to each group, and at that time, the display electrodes of a certain group of display lines are applied. On the other hand, when scanning voltage is sequentially applied, a voltage that causes a minute discharge to be generated continuously or intermittently in the cells of the display line is applied to the display electrodes of the other set of display lines. This is a method for driving a plasma display panel.

  According to the present invention, when a scanning voltage is applied during an address period, a minute discharge is generated continuously or intermittently in the cells of neighboring display lines, so that priming particles are supplied to the cells to be addressed, This prevents an address discharge error. Further, since the application time of the scanning voltage applied during the address period can be shortened, the address period can be shortened.

  In the present invention, examples of the substrate include substrates such as glass, quartz, and ceramic, and substrates on which desired components such as electrodes, insulating films, dielectric layers, and protective films are formed.

The display electrode and the address electrode can be formed using various materials and methods known in the art. Examples of materials used for the display electrodes and the address electrodes include transparent conductive materials such as ITO and SnO ₂ and metal conductive materials such as Ag, Au, Al, Cu, and Cr. As a method for forming the display electrode and the address electrode, various methods known in the art can be applied. For example, it may be formed using a thick film forming technique such as printing, or may be formed using a thin film forming technique including a physical deposition method or a chemical deposition method. Examples of the thick film forming technique include a screen printing method. Among thin film formation techniques, examples of physical deposition methods include vapor deposition and sputtering. Examples of the chemical deposition method include a thermal CVD method, a photo CVD method, and a plasma CVD method.

  In the present invention, when the scanning voltage is sequentially applied to the display electrodes in the address period, the display lines are divided into a plurality of groups and the scanning voltage is sequentially applied to each group, and at that time, a display line of a certain group is displayed. When the scanning voltage is sequentially applied to the electrodes, a voltage is applied to the display electrodes of another set of display lines so that a minute discharge is generated continuously or intermittently in the cells of the display lines.

  In this case, the display lines are divided into two sets of odd display lines and even display lines, and when the scanning voltage is sequentially applied to the display electrodes of one of the odd or even display lines, the other set is displayed. It is desirable to apply a voltage to the display electrode of the display line so that a minute discharge is generated continuously or intermittently in the cell of the display line.

  Alternatively, when the scanning voltage is sequentially applied to the display electrodes in the address period, the display lines are divided into a plurality of groups, and the scanning voltage is sequentially applied to each group. When the scanning voltage is sequentially applied, a small discharge is generated continuously or intermittently in the cells of the display line with respect to the display electrodes of the other set of display lines located in the vicinity of the display line of the set. Such a voltage may be applied.

  In the above driving method, it is desirable to use a voltage pulse whose crest value gradually increases or decreases as a voltage to be applied in order to generate a minute discharge continuously or intermittently in the cells of the display line.

Further, it is desirable that the micro discharge generated continuously or intermittently in the cells of the display line is a surface discharge generated between the display electrodes.
The micro discharge generated continuously or intermittently in the cell of the display line may be configured to also serve as an initialization operation in the cell.

  In the above configuration, the plasma display panel is composed of cells for the three primary colors of red, green, and blue, and these three cells for the three primary colors are arranged at the positions of the vertices of the triangle when viewed in plan. It may be a delta arrangement plasma display panel.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. In addition, this invention is not limited by this, A various deformation | transformation is possible.

  FIG. 1 is a partially exploded perspective view showing a configuration example of a PDP to which a driving method of the present invention is applied. This PDP is an AC type three-electrode surface discharge type PDP for color display.

  The PDP 10 includes a front side panel assembly including a front side (display side) substrate 11 and a rear side panel assembly including a rear side substrate 21. As the front substrate 11 and the rear substrate 21, a glass substrate, a quartz substrate, a ceramic substrate, or the like can be used.

A pair of display electrodes X and Y are formed in parallel on the inner side surface of the substrate 11 on the front side with a gap between the non-discharge regions. A display line L is formed between the pair of display electrodes X and Y. Each of the display electrodes X and Y is made of a wide transparent electrode 12 such as ITO or SnO ₂ and, for example, Ag, Au, Al, Cu, Cr, and a laminated body thereof (for example, a laminated structure of Cr / Cu / Cr). And a narrow bus electrode 13 made of metal. For the display electrodes X and Y, a desired number and thickness can be obtained by using a thick film forming technique such as screen printing for Ag and Au, and using a thin film forming technique such as vapor deposition and sputtering and an etching technique for others. It can be formed with a width, width and spacing.

  On the display electrodes X and Y, a dielectric layer 17 for alternating current (AC) driving is formed so as to cover the display electrodes X and Y. The dielectric layer 17 is formed by applying a low-melting glass paste on the front substrate 11 by screen printing and baking.

  A protective film 18 is formed on the dielectric layer 17 to protect the dielectric layer 17 from damage caused by ion collision caused by discharge during display. This protective film is made of, for example, MgO, CaO, SrO, BaO or the like.

  On the inner side surface of the substrate 21 on the back side, a plurality of address electrodes A are formed in a direction intersecting the display electrodes X and Y in plan view, and a dielectric layer 24 is formed to cover the address electrodes A. . The address electrode A generates an address discharge for selecting a light emitting cell at the intersection with the scanning display electrode, and is formed in a three-layer structure of Cr / Cu / Cr. In addition, the address electrode A can be formed of Ag, Au, Al, Cu, Cr, or the like. As with the display electrodes X and Y, the address electrode A uses a thick film forming technique such as screen printing for Ag and Au, and a thin film forming technique such as vapor deposition and sputtering and an etching technique for the other. Thus, it can be formed with a desired number, thickness, width and interval. The dielectric layer 24 can be formed using the same material and the same method as the dielectric layer 17.

  A plurality of partition walls 29 are formed on the dielectric layer 24 between the adjacent address electrodes A and A. The partition walls 29 can be formed by a sand blast method, a printing method, a photo etching method, or the like. For example, in the sandblasting method, a glass paste made of a low melting point glass frit, a binder resin, a solvent, etc. is applied on the dielectric layer 24 and dried, and then a cutting mask having an opening of a partition pattern is formed on the glass paste layer. It forms by spraying cutting particle | grains in the provided state, cutting the glass paste layer exposed to the opening of a mask, and also baking. In the photo-etching method, instead of cutting with cutting particles, a photosensitive resin is used as the binder resin, and it is formed by baking after exposure and development using a mask.

  Red (R), green (G), and blue (B) phosphor layers 28R, 28G, and 28B are formed on the side surfaces of the partition walls 29 and on the dielectric layer 24 between the partition walls. For the phosphor layers 28R, 28G, and 28B, a phosphor paste containing phosphor powder, a binder resin, and a solvent is applied to the concave discharge space between the barrier ribs 29 by screen printing or a method using a dispenser. This is repeated for each color and then fired. The phosphor layers 28R, 28G, and 28B can be formed by a photolithography technique using a sheet-like phosphor layer material (so-called green sheet) containing phosphor powder, a photosensitive material, and a binder resin. In this case, a phosphor sheet of each color can be formed between the corresponding partition walls by applying a sheet of a desired color to the entire display area on the substrate, exposing and developing, and repeating this for each color. it can.

  In the PDP 10, the front panel assembly and the rear panel assembly described above are arranged so that the display electrodes X and Y and the address electrode A intersect with each other, the periphery is sealed, and the partition 29 is surrounded. It is produced by filling the discharge space 30 with a discharge gas. In this PDP, the discharge space 30 at the intersection of the display electrodes X and Y and the address electrode A is one cell region (unit light emitting region) which is the minimum unit of display. One pixel is composed of three cells, R, G, and B.

  Screen display is performed by the ADS drive method. That is, one frame is composed of a plurality of weighted subfields, and each subfield has an initialization period in which charges of all cells are equalized, an address period in which cells to be emitted are selected, and a selected cell And a sustain period during which light is emitted.

In the initialization period, a reset voltage is applied between all X electrodes and Y electrodes to equalize the charges of all cells.
In the address period, wall charges are accumulated in the cells to be lit by sequentially scanning the Y electrodes, and in the sustain period, a pulse voltage is applied between the display electrodes of all the cells to perform screen display. Specifically, first, in the address period, a scan voltage (scan pulse) is sequentially applied using the Y electrode group as a scan electrode, and an address voltage (address pulse) is applied to a desired address electrode A in the meantime. A cell to be lit is selected by generating an address discharge between the selected address electrode A and Y electrode.
Since a wall charge is formed on the dielectric layer corresponding to the light emitting cell, a sustain voltage is applied alternately between the Y electrode group and the X electrode group, so that the cell in which the wall charge is accumulated is stored. The cell is caused to emit light by generating a sustain discharge again in step. This cell emits light by exciting the phosphor in the phosphor layer with ultraviolet rays generated by display discharge and generating visible light of a desired color from the phosphor.

FIG. 2 is an explanatory diagram showing an example of the driver configuration of the PDP. This figure shows a state in which the PDP is viewed in plan.
In the present PDP 10, the display electrodes X and Y are divided into two sets of odd-numbered and even-numbered sets, which are respectively referred to as X1, X2 electrodes and Y1, Y2 electrodes.

  That is, the display electrodes X and Y are applied to the group of display electrodes X1 and Y1 for applying a voltage to the cell group constituting the odd-numbered display line and the voltage is applied to the cell group constituting the even-numbered display line. It is divided into a set of display electrodes X2 and Y2 for application.

  Here, a cell group of odd display lines sandwiched between the X1 electrode and the Y1 electrode is referred to as a cell A group, and a cell group of even display lines sandwiched between the X2 electrode and the Y2 electrode is referred to as a cell B group.

  A drive voltage is applied to the odd display line X1 electrode using the odd row X driver 31, and a drive voltage is applied to the odd display line Y1 electrode using the odd row Y driver 32. A drive voltage is applied to the X2 electrode of the even display line using the even row X driver 33, and a drive voltage is applied to the Y2 electrode of the even display line using the even row Y driver 34. To do.

FIG. 3 is an explanatory diagram showing an example of an applied voltage waveform when the PDP shown above is driven. In the figure, voltage waveforms applied to the address electrode A, the odd display electrodes X1 and Y1, and the even display electrodes X2 and Y2 are shown.
In this driving, a reset voltage pulse is simultaneously applied between the display electrodes X1 and Y1 of the cell A group and between the display electrodes X2 and Y2 of the cell B group in the initialization period. That is, the reset voltage pulse is applied to all the cells in the A group and the B group. Subsequently, in the compensation period, a compensation voltage pulse having a polarity opposite to that of the initialization period is applied to achieve uniform charge in each cell. This compensation period can also be considered as part of the initialization period.

  In the address period, the address period is divided into the first half and the second half, the first half is the cell A group address period, and the second half is the cell B group address period. In the first half, the cell A group is addressed, and in the second half, the cell B group is addressed. To address the cell A group is to sequentially apply a scan pulse to the Y1 electrode among the X1 and Y1 electrodes of the display line constituted by the cell A group, and to apply an address pulse to a desired address electrode in the meantime. . To address the cell B group is to sequentially apply a scan pulse to the Y2 electrode among the X2 and Y2 electrodes of the display line constituted by the cell B group, and to apply an address pulse to a desired address electrode in the meantime. .

  In the sustain period, a sustain voltage is applied between all the XY electrodes without distinction between the cell A group and the cell B group. That is, the sustain voltage is applied simultaneously between the X1-Y1 electrodes and between the X2-Y2 electrodes.

FIG. 4 is a graph showing the state of each cell in the address period on the cell voltage plane.
The horizontal axis indicates the cell voltage between the XY electrodes, and the vertical axis indicates the cell voltage between the A-Y electrodes. The cell voltage between the XY electrodes is a voltage applied between the X electrode and the Y electrode when attention is paid to a certain cell. Similarly, the cell voltage between the A and Y electrodes is the address electrode. It means the voltage applied between the A and Y electrodes.

  A closed curve indicated by a bold line in the figure is called a “Vt closed curve”, and indicates a start threshold voltage of minute discharge. In the address operation, the cell takes the following four states from the application state of the scan pulse and the address pulse. The circled numbers in the figure indicate the state No. Indicates.

  In the address period of the cell A group, the cell B group takes state 4 or state 2. In the present invention, in the address period of the cell A group, a blunt wave pulse is applied between the X2 and Y2 electrodes of the cell B group, thereby generating a micro discharge continuously or intermittently in each cell of the cell B group. This minute discharge is a surface discharge by the X2 and Y2 electrodes of the cell B group. In the address period of the cell B group, a blunt wave pulse is applied between the X1 and Y1 electrodes of the cell A group, thereby generating a micro discharge continuously or intermittently in each cell of the cell A group. This minute discharge is a surface discharge by the X1 and Y1 electrodes of the cell A group.

  An obtuse wave pulse is a voltage pulse whose peak value gradually increases, and applying an obtuse wave pulse means applying a voltage pulse whose peak value gradually increases. When such a blunt wave pulse is applied, a large discharge is not generated in the cell, and a minute discharge is generated continuously or intermittently.

  In the address period, priming particles are supplied to the cell A group by causing the cell B group to be micro-discharged at the time of addressing the cell A group, thereby helping to generate an address discharge in the cell A group. At the time of addressing the cell B group, the cell A group is subjected to a minute discharge to supply priming particles to the cell B group, thereby helping to generate an address discharge in the cell B group. This prevents an address discharge error. In addition, the application period of the scan pulse applied in the address period is shortened to shorten the address period.

  To do this, the voltages applied to the X1, X2, Y1, and Y2 electrodes are controlled independently. Thereby, the cell voltage of the cell B group can be controlled regardless of the state of the cell A group. Further, it is possible to control the cell voltage of the cell A group regardless of the state of the cell B group.

  However, when blunt wave discharge (discharge by applying a blunt wave pulse) is performed in the counter discharge between the A and Y electrodes, if the cell voltage exceeds the counter discharge threshold, strong discharge due to the address pulse ON or OFF occurs. Then, there is a possibility that the blunt wave discharge after the discharge does not occur. Therefore, blunt wave discharge is performed by surface discharge between XY electrodes.

An example of driving when the PDP shown in FIGS. 1 and 2 is used will be described below.
Driving example 1
FIG. 5 is an explanatory diagram showing an applied voltage waveform in Driving Example 1.
In this example, first, the cell A group and the cell B group are initialized and compensated simultaneously, the address operation of the cell A group is performed, and an obtuse wave pulse that causes surface discharge in the cell B group is applied. An auxiliary discharge (auxiliary blunt wave discharge) is generated to supply priming particles to the cell A group.

  Thereafter, the cell B group is initialized and compensated again. Next, the address operation of the cell B group is performed, and an auxiliary blunt wave discharge is generated by applying a blunt wave pulse that generates a surface discharge for the non-light emitting cell to the cell A group. Supply.

  In this case, at the time of the address operation of the cell B group, the address of the cell A group is finished, and the wall charge has already been formed in the cell to emit light, but the cell A group is retained while this wall charge is held. The auxiliary blunt wave discharge is generated only for the non-light emitting cells. For this purpose, the following voltage pulse is applied between the X1 and Y1 electrodes of the cell A group.

  In other words, the address voltage is applied with the address electrode A having a positive polarity and the Y1 electrode having a negative polarity. Therefore, in the cells to be lit in the cell A group, after the address discharge, the Y1 electrode has a positive polarity charge. However, a negative polarity charge is accumulated in the address electrode A.

  On the other hand, after initialization between the X and Y electrodes, a positive charge is accumulated in the X1 electrode and a negative charge is accumulated in the Y1 electrode, although the charge is small. For this reason, in the cells of the cell A group that do not emit light, positive charge is accumulated in the X1 electrode and a small amount of negative charge is accumulated in the Y1 electrode.

  Therefore, a positive polarity rectangular voltage pulse is applied to the X1 electrode of the cell A group, and a negative polarity obtuse wave pulse is applied to the Y1 electrode. The potential applied at this time is set such that the wall charges accumulated in the cells of the cell A group that should emit light do not change. As a result, auxiliary blunt wave discharge is generated only between the X1 and Y1 electrodes of the cell A group that does not emit light (non-light emitting cell).

  In this way, in the latter half of the address period, the obtuse wave in which the surface discharge occurs only in the non-light emitting cells without changing the charge state of the light emitting cells in the cell A group between the X1 and Y1 electrodes of the cell A group. A pulse is applied to generate an auxiliary blunt wave discharge.

Driving example 2
FIG. 6 is an explanatory diagram showing an applied voltage waveform in Driving Example 2.
In this example, first, the cell A group is initialized and compensated. Next, the address operation of the cell A group is performed, and at the same time, the cell B group is initialized. In this initialization, a blunt wave pulse is applied to the cell B group to generate an auxiliary blunt wave discharge, and priming particles are supplied to the cell A group.

  Subsequently, the charge compensation of the cell B group is performed, and the address operation of the cell B group is further performed. In the address operation of the cell B group, an auxiliary blunt wave discharge is generated by applying a blunt wave pulse that generates a surface discharge for the non-light emitting cell to the cell A group, and priming particles are supplied to the cell B group.

  In the above example, the cells scanned in the address are divided into two sets of cells A of odd display lines and cells B of even display lines. Although the wave discharge is generated, the present invention is not limited to this, and the cells are arranged in the cell groups of the first, fourth, seventh,... Row display lines, the second, fifth, eighth,. The cell group, the display line cell group in the 3rd, 6th, 9th row, are divided into 3 groups, and auxiliary blunt wave discharge is generated in the other 2 groups during the period when one group is scanned. May be.

Driving example 3
FIG. 7 is an explanatory diagram showing a driving example 3. FIG. 7A shows the relationship between the display line that generates the auxiliary blunt wave discharge and the display line that applies the scan pulse, and FIG. 7B shows the voltage waveform of the blunt wave pulse and the voltage waveform of the scan pulse. Yes.

  It is sufficient that the auxiliary blunt wave discharge is generated in the display line in the vicinity of the display line to which the scanning pulse is applied. In the driving example described above, for example, a display line in the vicinity of the first scanned display line has generated an unnecessarily large amount of auxiliary blunt wave discharge, which causes an increase in background light emission and a display contrast. To affect.

  In this driving example, the cell is divided into two sets of a cell A group of odd display lines and a cell B group of even display lines, and auxiliary blunt wave discharge is generated in the other set during a period during which one set is scanned. The point is the same as in the driving example described above, but in order to prevent the increase in background light emission, auxiliary blunt wave discharge is applied to the display line located upstream of the display line after scanning. The blunt wave pulse is controlled so as not to be generated.

In FIG. 7A, L ₂ , L _k , and L _n indicate display lines to which scanning pulses are applied, and L ₁ , L _k−1 , and L _n−1 indicate display lines to which obtuse wave pulses are applied. Yes.
In FIG. 7B, X ₁ and Y ₁ indicate the voltage waveform of the obtuse wave pulse applied to the X and Y electrodes of the display line L ₁ , and Y ₂ indicates the scan pulse applied to the Y electrode of the display line L ₂ . A voltage waveform is shown. Similarly, X _k-1 and Y _k-1 indicate voltage waveforms of an obtuse wave pulse applied to the X and Y electrodes of the display line L _k-1 , and Y _k is applied to the Y electrode of the display line L _k. The voltage waveform of the scanning pulse is shown. X _n-1 and Y _n-1 indicate voltage waveforms of an obtuse wave pulse applied to the X and Y electrodes of the display line L _n-1 , and Y _n indicates a voltage of the scanning pulse applied to the Y electrode of the display line L _n. The waveform is shown.

In this embodiment, for example, when applying a scan pulse to the display lines in the even rows, and at the same time the application of the scan pulse ends for Y ₂ electrodes of the display lines L _2, X ₁ display line L ₁ of the previous line, Y The application of the blunt wave pulse applied to _one electrode is terminated. Similarly, the obtuse wave applied to the X _k-1 and Y _k-1 electrodes of the display line L _{k-1 in} the previous row at the same time as the application of the scanning pulse to the Y _k electrode of the display line L _k ends. End the pulse application. At the same time as the application of the scan pulse to the Y _n electrode of the display line L _n is completed, the obtuse wave pulse applied to the X _n-1 and Y _n-1 electrodes of the display line L _n-1 of the previous row is applied. Terminate.

In this case, display unevenness occurs because there is a difference between the amount of light emitted by the auxiliary blunt wave discharge near the scanning start position and the amount of light emitted by the auxiliary blunt wave discharge near the scanning end position.
Therefore, either the method of shifting the scanning start position for each subfield, or the method of switching the scanning direction from top to bottom and bottom to top, for each subfield or frame, or for each series of scanning. Apply.

FIG. 8 is an explanatory diagram illustrating an example of a circuit configuration in the case of driving in the driving example 3.
In the figure, 41 is a scan driver LSI, 42 is an auxiliary blunt wave discharge stop electrode line, 43 is an auxiliary blunt wave discharge generating electrode line, and 44 is a Y sustainer reset waveform generating circuit.

  In this circuit, an obtuse wave pulse is applied to the electrode of the display line for which the auxiliary obtuse wave discharge is generated through the switching element of the scan driver LSI 41 and the scanning of the neighboring display line is completed. The scan driver LSI is operated so as to stop the application of.

Driving example 4
FIG. 9 is an explanatory diagram showing a driving example 4. FIG. 9A shows an area on the screen where auxiliary blunt wave discharge is generated, and FIG. 9B shows a voltage waveform of the blunt pulse.

In this example, as shown in FIG. 9A, the cells for generating the auxiliary blunt wave discharge are divided into a display line cell A1 group belonging to the screen area 1 and a display line cell A2 group belonging to the screen area 2. Are divided into four groups: a display line cell A3 group belonging to the screen area 3 and a display line cell A4 group belonging to the screen area 4.
Then, as shown in FIG. 9B, the obtuse wave pulse is applied only to the cell group of the display line in the vicinity of the display line to which the scanning pulse is applied.

That is, an obtuse wave pulse as shown in the figure is applied to the Y _A1 electrode of the cell A1 group only during the scanning period TS _{A1 of} area 1. An obtuse wave pulse as shown in the figure is applied to the Y _A2 electrode of the cell A2 group only during the scanning period TS _A2 of the area 2. An obtuse wave pulse as shown in the figure is applied to the Y _A3 electrode of the cell A3 group only during the scanning period TS _A3 of the area 3. An obtuse wave pulse as shown in the figure is applied to the Y _A4 electrode of the cell A4 group only during the scanning period TS _A4 of the area 4.
In the above description, the screen area is divided into four. However, the present invention is not limited to this, and the screen area may be divided into any number as long as priming particles for auxiliary blunt wave discharge can be supplied.

FIG. 10 is an explanatory diagram illustrating an example of a circuit configuration in the case of driving in the driving example 4.
In the figure, 45 is a scan driver LSI, and 46 is a Y sustainer reset waveform generation circuit.
In this circuit, an obtuse wave pulse is applied to the electrode of the display line that generates the auxiliary obtuse wave discharge through the switching element of the scan driver LSI 45, and the obtuse wave pulse is applied only to the electrode of the display line in the area to which the scan pulse is applied. The scan driver LSI is operated so as to apply.

  FIG. 11 is a partially exploded perspective view showing a configuration example of another PDP to which the driving method of the present invention is applied. This PDP is an AC type three-electrode surface discharge type PDP for color display, and this figure shows a state in which the PDP is viewed in a plane.

  This PDP has the same configuration as that of the PDP shown in FIGS. 1 and 2 with respect to the panel assembly on the back side. That is, the address electrodes A are arranged in stripes in the vertical direction in the figure, and the partition walls 29 are formed between the address electrodes A and the address electrodes A.

  The front panel assembly has basically the same configuration as the PDP shown in FIGS. 1 and 2, but the configuration of the display electrodes X and Y is different. That is, cells are formed above and below the Y1 and Y2 electrodes, respectively, so that they can be addressed simultaneously.

  Specifically, the X electrode and the Y electrode are arranged at equal intervals so that surface discharge is possible between all the XY electrodes and between the Y-X electrodes. Both the X electrode and the Y electrode are formed of the transparent electrode 12 and the bus electrode 13, and the transparent electrode 12 is formed only on the corresponding portion of the cell. Surface discharge is possible between all the transparent electrodes 12 between the X electrode and the Y electrode and between the Y electrode and the X electrode.

  Thus, this PDP is a PDP having a delta arrangement in which one pixel is constituted by three cells of R, G, and B arranged at each vertex of a triangle.

  In this driving method, as in the driving example 1 and driving example 2 described above, the display electrodes are divided into two groups, and one set of address operations is performed in the first half of the address period, while the auxiliary blunt wave discharge is performed in the other group. The auxiliary blunt wave discharge is generated in one set while performing the address operation of the other set in the second half of the address period.

  In this PDP, when dividing the display electrode into two groups, attention is paid only to the Y electrode to which the scan pulse is applied, and a group of cells positioned above and below the odd-numbered Y electrode Y1 is defined as a cell A group, and the even-numbered Y electrode Y2 A set of cells positioned at the top and bottom in FIG.

FIG. 12 is an explanatory diagram showing an example of an applied voltage waveform when driving the above PDP.
In this example, first, the cell A group is initialized and compensated. Next, an address operation of the cell A group is performed. At this time, an obtuse wave pulse is applied to the cell B group to generate an auxiliary blunt wave discharge, and priming particles are supplied to the cell A group. Thereafter, the cell B group is initialized and compensated, and the address operation of the cell B group is performed. At this time, an obtuse wave pulse that generates a surface discharge for the non-light emitting cell is applied to the cell A group to generate an auxiliary blunt wave discharge, and priming particles are supplied to the cell B group.

  In this way, the cells scanned in the address are divided into a plurality of groups, and an auxiliary blunt wave discharge is generated in the other group during the period during which one group is scanned. As a result, priming particles are supplied to the cells to be scanned to prevent address discharge errors. Further, the application time of the scanning voltage applied in the address period is shortened to shorten the address period.

It is explanatory drawing which shows the structural example of PDP to which the drive method of this invention is applied. It is explanatory drawing which shows an example of the driver structure of PDP of FIG. It is explanatory drawing which shows an example of the applied voltage waveform of PDP of FIG. It is the graph which represented the state of the cell on the cell voltage plane. FIG. 6 is an explanatory diagram showing an applied voltage waveform in Driving Example 1; FIG. 11 is an explanatory diagram showing an applied voltage waveform in Driving Example 2. It is explanatory drawing which shows the drive example 3. FIG. It is explanatory drawing which shows an example of the circuit structure in the case of driving by the drive example 3. FIG. It is explanatory drawing which shows the drive example 4. FIG. It is explanatory drawing which shows an example of the circuit structure in the case of driving by the drive example 4. FIG. It is explanatory drawing which shows the structural example of another PDP. It is explanatory drawing which shows an example of the applied voltage waveform of PDP of FIG.

Explanation of symbols

10 PDP
DESCRIPTION OF SYMBOLS 11 Front side board | substrate 12 Transparent electrode 13 Bus electrode 17, 24 Dielectric layer 18 Protective film 21 Back side board | substrate 28R, 28G, 28B Phosphor layer 29 Bulkhead 30 Discharge space 31 Odd row X driver 32 Odd row Y driver 33 Even Row X driver 34 Even row Y driver 41, 45 Scan driver LSI
42 auxiliary blunt wave discharge stop electrode line 43 auxiliary blunt wave discharge generating electrode line 44, 46 Y sustainer reset waveform generating circuit A address electrode L display line X, Y display electrode

Claims (8)

A plurality of display electrodes are provided in parallel between a pair of substrates, and a plurality of address electrodes are provided in a direction crossing the display electrodes, and the intersection between the display lines between the display electrodes and the address electrodes is configured to emit light as a cell. When a screen is displayed using a plasma display panel, one frame is composed of a plurality of subfields, and each subfield has at least an address period for selecting a cell to emit light and a sustain period for causing the selected cell to emit light. In the address period, the wall charges are accumulated and maintained in the cells to emit light by sequentially applying the scanning voltage to the display electrodes during the address period and applying the voltage to the desired address electrodes to generate the address discharge. In the drive of the plasma display panel that performs screen display by generating a sustain discharge between the display electrodes during the period,
When the scanning voltage is sequentially applied to the display electrodes in the address period, the display lines are divided into a plurality of groups, and the scanning voltage is sequentially applied to each group. At that time, the display electrodes of a certain set of display lines are scanned. A plasma characterized in that when a voltage is sequentially applied, a voltage is applied to display electrodes of another set of display lines so that a minute discharge is continuously or intermittently generated in the cells of the display lines. Display panel drive method. Dividing the display lines into a plurality of sets consists of dividing the display lines into two sets of odd display lines and even display lines. The scan voltage is applied to the display electrodes of one of the odd or even display lines. A voltage is applied to the display electrodes of the other set of display lines so that a minute discharge is generated continuously or intermittently in the cells of the display line. 2. A driving method of a plasma display panel according to 1. A plurality of display electrodes are provided in parallel between a pair of substrates, and a plurality of address electrodes are provided in a direction crossing the display electrodes, and the intersection between the display lines between the display electrodes and the address electrodes is configured to emit light as a cell. When a screen is displayed using a plasma display panel, one frame is composed of a plurality of subfields, and each subfield has at least an address period for selecting a cell to emit light and a sustain period for causing the selected cell to emit light. In the address period, the wall charges are accumulated and maintained in the cells to emit light by sequentially applying the scanning voltage to the display electrodes during the address period and applying the voltage to the desired address electrodes to generate the address discharge. In the drive of the plasma display panel that performs screen display by generating a sustain discharge between the display electrodes during the period,
When the scanning voltage is sequentially applied to the display electrodes in the address period, the display lines are divided into a plurality of groups, and the scanning voltage is sequentially applied to each group. At that time, the display electrodes of a certain set of display lines are scanned. When voltage is sequentially applied, a minute discharge is generated continuously or intermittently in the cells of the display line with respect to the display electrodes of another display line located in the vicinity of the display line of the set. A method for driving a plasma display panel, comprising applying a voltage. A plurality of display electrodes are provided in parallel between a pair of substrates, and a plurality of address electrodes are provided in a direction crossing the display electrodes, and the intersection between the display lines between the display electrodes and the address electrodes is configured to emit light as a cell. When a screen is displayed using a plasma display panel, one frame is composed of a plurality of subfields, and each subfield has at least an address period for selecting a cell to emit light and a sustain period for causing the selected cell to emit light. In the address period, the wall charges are accumulated and maintained in the cells to emit light by sequentially applying the scanning voltage to the display electrodes during the address period and applying the voltage to the desired address electrodes to generate the address discharge. In the drive of the plasma display panel that performs screen display by generating a sustain discharge between the display electrodes during the period,
When the scanning voltage is sequentially applied to the display electrodes in the address period, the display lines are divided into a plurality of groups, and the scanning voltage is sequentially applied to each group. At that time, the display electrodes of a certain set of display lines are scanned. When the voltage is sequentially applied, the display lines in the display line that are not applied with the scan voltage in the address period in the display line in which the scan voltage is sequentially applied in another set. In such a case, a voltage that causes a minute discharge to be generated continuously or intermittently in the display line, and a voltage that does not cause a minute discharge in a display line cell located near the display line to which a scanning voltage has already been applied in the address period. A method for driving a plasma display panel, wherein The plasma display panel according to claim 1, 3 or 4, wherein the voltage applied to generate a micro discharge continuously or intermittently in the cells of the display line is a voltage pulse whose crest value gradually increases or decreases. Driving method. 5. The method of driving a plasma display panel according to claim 1, wherein the micro discharge generated continuously or intermittently in the cells of the display line is a surface discharge generated between the display electrodes. 5. The method for driving a plasma display panel according to claim 1, 3 or 4, wherein the micro discharge generated continuously or intermittently in the cell of the display line also serves as an initialization operation in the cell. The plasma display panel is composed of cells for three primary colors of red, green, and blue, and the cells of the three primary colors are arranged in a delta arrangement in which the three cells for the three primary colors are respectively arranged at the positions of the apexes of the triangle when viewed in a plane. 5. The method for driving a plasma display panel according to claim 1, wherein the plasma display panel is a plasma display panel.

Images