KR20000040710A - Method for driving a plasma display panel - Google Patents

Abstract

PURPOSE: A driving method of plasma display panel is provided to effectively reduce a number of electrode and a line fitch by using a progressive driving methode. CONSTITUTION: A plurality of stripe-shaped data electrodes are formed on a substrate. Addressing pulse and subsidiary discharging pulse are progressively applied to Y electrodes in corresponding period to the address pulse of an address electrode. At the time, the addressing pulse and the subsidiary discharging pulse are applied two times per one Y electrode. The subsidiary discharging pulse applied to the same Y electrode is applied to Xa electrodes and Xb electrode, respectively. Thereby, X electrode or Y electrode passed adjacent discharging cell is used one electrode so as to remove non-discharging region.

Description

Driving method of surface discharge type plasma display panel

The present invention relates to a method of driving a surface discharge plasma display panel of a matrix display method.

1 is a cross-sectional view of a conventional surface discharge plasma display panel. 1 is a cross-sectional view taken in a direction parallel to the address electrode in order to show the formation position of the discharge space according to the arrangement of the discharge sustain electrodes. As shown in the drawing, in the conventional surface discharge type plasma display panel, the front substrate 1 and the rear substrate 2 are disposed to face each other at regular intervals, and the address electrodes 4 in the direction intersecting each other on the opposite surface thereof. And discharge sustain electrodes 3 are arranged. Here, the discharge sustain electrodes 3 are arranged such that the common electrode X and the scan electrode Y are paired, respectively, and a black matrix 6 for blocking light is disposed therebetween. A discharge space 5 is formed between each pair of discharge sustain electrodes, that is, between the common electrode X and the scan electrode Y, and becomes a non-discharge region 7 in an area where the black matrix 6 is disposed.

In the surface discharge plasma display panel configured as described above, as shown in FIG. 2, the address discharge and the common electrode are selected to apply wall voltage to a discharge cell corresponding to a specific pixel, and are common to the discharge sustain electrodes. When the discharge sustain pulse is applied, the sustain discharge occurs only in the discharge cells in which the wall charges have already been formed, so that images of each field are displayed. Therefore, the image is divided into fields of each time and displayed in sequential order. In this driving method, since the non-discharge area in which the black matrix 6 is formed occupies a considerable area, the overall brightness is low and the resolution is low.

FIG. 3 is a cross-sectional view of an ALiS plasma display panel in which a non-discharge area is removed from the surface discharge plasma display panel. As illustrated, in the ALiS type surface discharge plasma display panel, the front substrate 100 and the rear substrate 200 are disposed to face each other at regular intervals, and the address electrodes are disposed to cross the opposite surfaces. The points 400 and the discharge sustain electrodes 300 are disposed in the same manner as in the plasma display panel. However, the black matrix for blocking light is not disposed between the pair of discharge sustain electrodes 300, so that the discharge sustain electrodes 300 are disposed on the stripe at regular intervals. That is, each common electrode X or scan electrode Y is shared in two adjacent discharge cells. Therefore, since the electrode placement density can be increased for the same area, the resolution can be increased, and since the non-discharge area is eliminated, the luminance is increased.

4 is a view for explaining a method of driving the ALiS type surface discharge plasma display panel. As shown in the drawing, the ALiS driving method developed by Fujitsu Corp. secures the discharge space 500 between all the discharge sustain electrodes 300 without the non-discharge region, causing discharge, and uses this discharge for screen display. In particular, such a driving scheme corresponds to an analog broadcasting scheme such as Hivision broadcasting, and is realized by interlacing scan as shown in FIG. 4. That is, in driving the sustain electrode pair for displaying an image of one frame, the odd-numbered ones generate a discharge in the first frame and the even-numbered ones generate a discharge in the second frame to configure the screen. Therefore, this driving method is applicable only to HD format of 1080I (where I stands for interlaced scan) for digital television broadcasting, and not for 720P or 1080P (where P stands for progressive scan). There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and removes the non-discharge area, thereby driving the surface discharge type plasma display panel capable of driving a structurally simple surface discharge type plasma display panel in a progressive scanning manner instead of interlaced scanning. The purpose is to provide a method.

1 is a cross-sectional view of a conventional surface discharge plasma display panel;

FIG. 2 is a diagram for describing a method of driving the surface discharge plasma display panel of FIG. 1;

3 is a cross-sectional view of another conventional surface discharge plasma display panel (ALiS method);

4 is a diagram for describing a method of driving the surface discharge plasma display panel of FIG. 3;

5 is an exploded perspective view of a front substrate and a back substrate separated to show a schematic structure of a surface discharge plasma display panel according to the present invention;

6 is a plan view illustrating a structure of a discharge sustain electrode of the surface discharge plasma display panel of FIG. 5;

7 is a waveform diagram of various electrode driving signals for driving the surface discharge plasma display panel of FIG. 5.

Explanation of symbols for main parts of the drawings

1. Front board 2. Back board

3. Discharge sustain electrodes 4. Address electrodes

5. discharge space 6. black stripe

7. Non-discharge area 11. Front glass substrate

12. Discharge sustaining electrode pair (bus electrode) 12 '. T-shaped transparent conductive film

17. Dielectric layer 18. MgO protective film

21. Back glass substrate 28. Phosphor

29. bulkhead 30. discharge space

100. Front substrate 200. Back substrate

300. Discharge sustaining electrodes 400. Address electrodes

H: display area PU: unit light emitting area

A: address electrodes PX1, PX2: pixels

In order to achieve the above object, a method of driving a surface discharge plasma display panel according to the present invention includes: two substrates facing each other; Data electrodes formed in a stripe shape on opposite surfaces of one of the two substrates; Discharge holding electrodes Xa, Xb and Y are formed on the opposite surface of the other substrate on the stripe in the direction crossing the data electrodes, respectively, wherein the odd-numbered common electrodes are Xa and the even-numbered common electrodes are Xb. When Yn is the nth (n = 1, 2, 3, ...) th scanning electrode, the overall order is Xa-Y1-Xb-Y2-Xa-Y3-Xb-Y4 -... An AC surface discharge type plasma display panel in which 2n rows of discharge cells are formed of 2n + 1 discharge sustain electrodes by arranging the common electrodes and the scan electrodes, in an addressing period in which an address pulse is applied to the address electrodes. In the period corresponding to the address pulse of the address electrode, the addressing pulse having the opposite polarity to the address pulse and the auxiliary discharge pulse having the opposite polarity to the addressing pulse are sequentially applied to the Y electrodes before the addressing pulse. , See above Applying twice per Y electrodes a discharge pulse and a pulse for addressing; And the Xa electrodes are connected to the Xa electrodes and the Xb electrodes are tied to the Xb electrodes to apply an auxiliary discharge preventing pulse having the same polarity in the same period as the auxiliary discharge pulse, but for the two auxiliary discharges applied to the same Y electrode. Auxiliary discharge preventing pulses corresponding to each of the pulses are divided and applied to the Xa electrodes and the Xb electrodes one by one, and the second auxiliary discharge pulse is applied to the previously driven Y electrode among the adjacent Y electrodes and later. And an auxiliary discharge preventing pulse corresponding to each of the auxiliary discharge pulses first applied to the driven Y electrode to the same X electrodes among the Xa electrodes and the Xb electrodes.

In the present invention, the data electrode and one side of the substrate having a stripe-like partition or grid-shaped partition partitioning the discharge cells, the discharge sustaining electrodes, the working electrode or T-shaped transparent electrode as a base electrode, It is preferable to arrange a bus electrode on the stripe or to use a bus electrode on the stripe as a basic electrode and to arrange a transparent or T-shaped transparent electrode thereon.

Hereinafter, a driving method of a surface discharge plasma display panel according to the present invention will be described in detail with reference to the drawings.

FIG. 5 is an exploded perspective view showing a schematic structure of a surface discharge type plasma display panel which is structurally simple by eliminating the non-discharge area, and two pixels (eg, PX1 and PX2) on three electrodes (eg, Xa, Y1, and Xb). X electrodes and Y electrodes are alternately arranged in succession to show a basic structure in which pixels correspond to each other without a non-discharge area. That is, the display electrode structures are arranged in the order of Xa-Y1-Xb-Y2-Xa-Y3-Xb-Y4-Xa-Y5-Xb-.

The plasma display panel as shown is a surface discharge type PDP having a three-electrode structure in which a pair of display electrodes (X, Y) and an address electrode (A) correspond to a unit light emitting region PU of a matrix display, and according to the arrangement of the phosphors In terms of classification, it is called a reflection type. In the drawing, a first pixel PX1 composed of three unit emission regions PU between display electrodes Xa and Y1, a second pixel PX2 composed of three unit emission regions PU between display electrodes Y1 and Xb, and a display electrode Xb; A third pixel PX3 composed of three unit light emitting regions PU is shown between Y2.

The display electrodes X and Y for surface discharge are provided on the front glass substrate 11 on the display area H side and covered with the discharge space 30 by the dielectric layer 17. In other words, the display electrodes X and Y constitute the discharge sustaining electrode pair 12 in AC driving. Furthermore, an MgO film 18 having a thickness of about several thousand micrometers is provided on the surface of the dielectric layer 17 as a protective film.

In addition, since the display electrodes X and Y are arranged on the display surface H side with respect to the discharge space 30, in order to widen the surface discharge and further minimize the light shielding of the display light, a metal film having excellent conductivity. The bus electrode 12 is formed in such a manner that a transparent conductive film 12 'of an industrial shape (or T shape or stripe shape) made of a transparent electrode material such as ITO is connected. That is, the bus electrodes (display electrodes = bus electrodes + transparent conductive film) are disposed across the center of the transparent conductive film 12 '.

On the other hand, the address electrodes A for selectively emitting the unit light emitting regions PU are arranged at a constant pitch so as to be orthogonal to the display electrodes X and Y on the glass substrate 21 on the back side.

A stripe-shaped partition wall 29 having a height of about 80 to 160 μm is provided between each address electrode A, thereby discharging the space 30 in the line direction (extension direction of the display electrodes X and Y). Is divided for each unit light emitting area PU.

In addition, the phosphor glass 28 of three primary colors of R, G, and B is provided in the back glass substrate 21 so as to cover the inner surface of the back side including the upper surface of the address electrode A and the side surface of the partition wall 29. . The phosphors 28 of each color are excited and emitted by ultraviolet rays emitted by the discharge gas in the discharge space 30 during surface discharge. As described above, in the plasma display panel, full color display by a combination of R, G, and B is possible. In addition, the address electrode A may be covered with a dielectric layer in some cases.

6 is a plan view schematically illustrating the electrode configuration of the PDP of FIG. 5. In the PDP as shown, among the display electrodes arranged in the form of (Xa, Y1) (Y2, Xb) (Xa, Y3) (Y4, Xb) (Xa ...) for each line of the matrix display in the PDP of FIG. The display electrodes are configured in such a manner that two X electrodes (eg, Xb and Xa) and two Y electrodes (eg, Y1 and Y2, Y3 and Y4) of adjacent lines are combined into one X and Y electrodes, respectively. In the conventional electrode structure of XYYXXYYXX, as shown in Fig. 1, the discharge portion area is increased by eliminating the non-discharge portion between XX and YY (luminance enhancement). Then, as described above, two pixels (eg, PX1 and PX2) correspond to a series of three electrodes (eg, Xa, Y1 and Xb), and three consecutive electrodes (eg, Y1, Xb and Y2) correspond to each other. ) Has a basic structure in which two pixels (for example, PX2 and PX3) correspond to each other, that is, the structure of the display electrode is arranged in the order of Xa-Y1-Xb-Y2-Xa-Y3-Xb-Y4-. , Composition of discharge cell By sequentially configuring Xa-Y1, Y1-Xb, and Xb-Y2, n + 1 display electrodes are arranged in n rows of discharge cells, and additionally, the number of X electrodes and Y electrodes is reduced by about half. As the number of drive drives is reduced, the cost of the drive circuit portion is reduced, and driving by sequential scanning can obtain high image quality at the same resolution.

In the arrangement of such display electrodes, two display electrodes X and Y having the same dimension in the array direction are alternately arranged at equal intervals. Inevitably, n + 1 display electrodes X and Y extend parallel to each other at regular intervals in a total of n rows of discharge cells. The display electrode X is an electrode on the first polar side in applying a driving voltage for surface discharge, and the display electrode Y is an electrode on the second polar side.

Each display electrode X and each display electrode Y are arranged in the order Xa-Y1-Xb-Y2-Xa-Y3-Xb-Y4-, and each of the discharge cell lines is Xa-Y1, Y1-Xb, Xb-Y2,. In this order, drive pulses should be alternately applied to display electrodes X and Y corresponding to each other in the same cell. To this end, the electrode driving method of the plasma display panel according to the present invention uses the erasing addressing method following the auxiliary scan discharge as shown in FIG. 7 as the driving method of the address period.

First, in the t1 period, the auxiliary scan discharge occurs between Xa and Y1 (the discharge cells of the first column are selected). At this time, a pulse voltage Vx having the same polarity as the pulse voltage Vy applied to Y1 is applied to Xb in order to prevent discharge from occurring in the discharge space (discharge cells in the second column) between Xb and Y1. In this way, since Vy-Vx is applied in the discharge space (discharge cells in the second column) between Xb and Y1, the values of Vx and Vy should be set so that discharge cannot occur at this voltage.

Next, in the t3 period, when the pulse voltage Va is applied to the address electrode A, the addressing discharge occurs only in the discharge cells selected from the discharge cells in the first column in which the auxiliary scan discharge was previously performed. That is, since the addressing voltage is applied between the address electrodes A and Y1, the same external voltage is applied to the discharge cells of the first column and the second column, but only the discharge cells of the first column are space charges and wall charges generated by the preceding auxiliary scan discharges. Since it is present, if an appropriate voltage is applied, only the discharge cells of the first row are selectively discharged. At this time, a pulse voltage Vay having a polarity opposite to Va is applied to the electrode Y1, which prevents the address pulse voltage Va from becoming too large to cause differential voltage induced voltages on adjacent electrodes.

Next, in the t5 period, the auxiliary scan discharge occurs between Xb and Y1. In this case, unlike the t1 period, the auxiliary discharge prevention pulse voltage Vx is applied to Xa. The applied secondary discharge prevention pulse voltage Vx is for preventing the discharge from occurring in the discharge space (the discharge cell of the first column) between Xa and Y1, and a pulse having the same polarity as the pulse voltage Vy applied to Y1 is applied. Here, carefully consider that Vx is applied to Xa so that the discharge does not occur in the discharge space (the first row of discharge cells) between Xa and Y1, so that the effect of the discharge in this period of t3 is synergistic and discharges. The wall charges accumulated on the Y1 electrodes of the first column due to the discharge in the t3 period are positive and have the same polarity as the pulse voltage Vx. Therefore, the space charges generated by the discharge in the t3 period are offset. It is not to be concerned that it is impossible to cause a discharge with only the voltage as much as Vx due to these effects. These points are the same even if the polarity of the driving pulse voltage changes as a whole.

Next, in the t7 period, when the address pulse voltage Va is applied to the address electrode A, the addressing discharge occurs only in the discharge cells selected from the discharge cells in the second column in which the auxiliary scan discharge was previously performed. This is the same principle as that in which the addressing discharge occurs only in the discharge cells selected from the discharge cells in the first column in the t3 period.

Next, during the t9 period, an auxiliary scan discharge occurs between the discharge cells in the third row, that is, between Xb and Y2. At this time, the pulse voltage Vx applied to Xa is to prevent the discharge from occurring in the discharge space (the fourth row of discharge cells) between Xa and Y2, and a pulse having the same polarity as the pulse voltage Vy applied to Y2 is applied.

Next, in the t11 period, when a voltage is applied to the address electrode A, the addressing discharge occurs only in the discharge cells selected from the discharge cells in the three rows in which the auxiliary scan discharges were previously performed. That is, since the addressing voltage is applied between the address electrodes A and Y2, the same external voltage is applied to the third and fourth columns, but the space charge and the wall charge generated by the preceding auxiliary scan discharge exist only in the third column. When applied, it selectively discharges only to the third column.

Next, in the period t13, the auxiliary scan discharge occurs between the discharge cells in the fourth row, that is, between Xa and Y2. At this time, unlike the t9 period, the auxiliary discharge prevention pulse voltage Vx is applied to Xb. The applied secondary discharge prevention pulse is for preventing discharge from occurring in the discharge space (third row of discharge cells) between Xb and Y2, and a pulse having the same polarity as that applied to Y2 is applied.

Next, in the period t15, when a pulse voltage is applied to the address electrode A, the addressing discharge occurs only in the discharge cells selected from the discharge cells in the fourth column in which the auxiliary scan discharges were previously performed. This is the same principle as that in which the addressing discharge occurs only in the selected discharge cells of the third row of discharge cells in the t9 period.

In the plasma display panel arranged to drive n rows of discharge cells with n + 1 electrodes as shown in FIG. 6, the display electrodes Xa and the display electrodes Xb are separately provided for each of the lines (columns) to simplify the driving circuit. It is electrically common to the front end side, and when used, they are collectively connected to separate drive voltage sources, respectively. On the other hand, the display electrodes Y are independent individual electrodes line by line in order to enable screen scanning in line order, and the rear end side of the line L is connected to a separate drive voltage source corresponding to each line L. In this case, as shown in FIG. 7, the auxiliary discharge pulse and the addressing pulse are applied to the display electrode Y twice so as to correspond to the driving pulse applied to the display electrode Xa and the driving pulse applied to the display electrode Xb, respectively. .

In each line, the surface discharge cells are determined by the display electrodes Xa, Xb, and Y for each unit light emitting region PU partitioned by the partition 29 (see FIG. 5). Thus, the display electrode Y and the address electrode A select (address) the lighting / non-lighting of each discharge cell.

After such addressing, the discharge sustain driving is performed in the PDP for image display. In the discharge sustaining operation, wall charges are selectively accumulated by screen scanning in a line sequence in the above-described address period, and then in the discharge sustaining period, the intersection discharge is maintained at the display electrodes Xa and Xb of all the lines and the display electrodes Y of all the lines. Apply a pulse.

At this time, paying attention to the discharge cells of each adjacent line (column), since the X electrode and the Y electrode are alternately arranged adjacent to each other, the non-discharge area is eliminated, so that the electrode interval can be narrowed by that much. This means that the widths of the display electrodes X and Y can be widened. If the widths of the display electrodes X and Y are widened, the area of the display electrodes X and Y in the unit light emitting region PU is enlarged, and the surface discharge is enlarged. The brightness rises.

Furthermore, when the driving voltage source is connected to the end portions (one end or both ends) of the same side in the extending direction of the odd-numbered X electrodes Xa and even-numbered X electrodes Xb and Y electrodes, a discharge current is generated. Since the flow directions are the same, in spite of the voltage drop caused by the resistances of the display electrodes X and Y, the potentials in the respective portions in the extending direction become substantially the same between the lines L. That is, as in the case of the large screen having long display electrodes X and Y, even when the potential difference between the end portions and the center portions of the display electrodes X and Y is relatively large due to the voltage drop, the display electrodes X (or Y) on the same polarity side are the same. In this case, the potential distributions in the line direction are almost the same, and no potential difference occurs in the column direction.

In the above embodiment, the reflective PDP is illustrated, but the present invention can also be applied to a transmissive PDP in which the phosphor 28 is provided on the inner surface of the glass substrate 11 on the display surface H side. The address electrode A may be disposed on the same glass substrate 11 as the display electrodes X and Y.

As described above, in the surface discharge type plasma display panel according to the present invention, a plasma display panel having a structure in which a non-discharge area is eliminated by reducing the X electrode or the Y electrode passing through adjacent discharge cells by one is driven as follows. Has the same advantages.

First, the electrode arrangement is XYXYXY -..., which causes discharge between all the discharge sustaining (display) electrodes, and makes it possible to display them in sequential scanning manner, thereby for the specification of the same pixel block of all HD broadcast formats. The result is that the required number of sustain electrodes is cut in half. That is, about 2 times the resolution increase can be obtained for the HD broadcast formats of 720P and 1080P. This means that the non-discharge area that was inevitably existed in the existing three-electrode surface discharge electrode structure can be completely eliminated, and the amount can be expanded to the discharge area, and the luminance is improved by about two times. Means.

Second, since the number of two electrodes is reduced to one for each of the display electrodes X and Y, the number of scan electrodes is reduced to 1/2 compared with the conventional one. Here, since the common blocks of the X electrodes are changed from one to two, the number of reductions in the old drive driver is (number of vertical pixels / 2) -1. Therefore, this driving circuit part requires less, thus reducing the cost.

As described above, the surface discharge type plasma display panel according to the present invention can reduce the number of driving circuits and reduce the electrode spacing between the lines, so that the line pitch can be reduced to achieve high definition and at the same time in the unit light emitting region. The luminance can be improved by increasing the proportion of the display electrode and increasing the range of surface discharge.

In addition, it is possible to reduce light shielding by the display electrode and to improve luminous efficiency. In spite of the voltage drop caused by the resistance of the display electrode, the potential difference between the lines does not occur at each portion in the line direction, thereby facilitating large display of the display.

Claims (4)

Two substrates facing each other; Data electrodes formed in a stripe shape on opposite surfaces of one of the two substrates; Discharge sustain electrodes Xa, Xb and Y on strips in the direction crossing the data electrodes on opposite surfaces of the other substrate; Each one, When the odd-numbered common electrode is called Xa and the even-numbered common electrode is called Xb, and Yn is the nth (n = 1, 2, 3, ...) th scanning electrode, the overall Xa-Y1-Xb-Y2- In an AC surface discharge type plasma display panel in which 2n rows of discharge cells are formed of 2n + 1 discharge sustain electrodes by arranging the common electrodes and the scan electrodes in the order Xa-Y3-Xb-Y4 -... , In an addressing period in which an address pulse is applied to the address electrode, In the period corresponding to the address pulse of the address electrode, the addressing pulse having the opposite polarity to the address pulse and the auxiliary discharge pulse having the opposite polarity to the addressing pulse prior to the addressing pulse are sequentially applied to the Y electrodes. Applying the auxiliary discharge pulse and the addressing pulse twice per Y electrode; And The Xa electrodes are connected to the Xa electrodes and the Xb electrodes are tied to the Xb electrodes to apply an auxiliary discharge preventing pulse having the same polarity in the same period as the auxiliary discharge pulse, but the two auxiliary discharge pulses are applied to the same Y electrode. Auxiliary discharge preventing pulses corresponding to each are applied to the Xa electrodes and the Xb electrodes one by one, respectively, and a second auxiliary discharge pulse applied to a second Y electrode that is driven earlier among the adjacent Y electrodes and later driven. Applying an auxiliary discharge preventing pulse corresponding to the auxiliary discharge pulse first applied to the Y electrode to be applied to the same X electrodes among the Xa electrodes and the Xb electrodes; And a method for driving an AC surface discharge plasma display panel. The method of claim 1, And a stripe-shaped partition wall or a grid-shaped partition wall separating the discharge cells on the data electrode and one side substrate. The method of claim 1, And the discharge sustaining electrodes are formed of an industrial or T-shaped transparent electrode as a basic electrode, and a bus electrode on a stripe is disposed thereon. The method of claim 1, The discharge sustain electrodes are a bus electrode on a stripe as a basic electrode, and an industrial or T-shaped transparent electrode is disposed thereon, wherein the AC surface discharge type plasma display panel is driven.