JP2003123652A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel that can prevent cross talk. SOLUTION: A pair of electrodes, which are comprised of a scanning electrode 12 and a sustaining electrode 13 arranged with a discharge gap Xmg, are formed in plural sets on the substrate so that the scanning electrodes 12 and the sustaining electrodes 13 may be adjoined each other by providing an adjoining-cells gap Xipg between these pairs of electrodes. A plurality of slits are provided on the adjoining-cells gap Xipg side of the sustaining electrode 13 and the slits 14 provided at each of the sustaining electrodes 13 adjoining each other interposing the adjoining-cells gap Xipg are arranged mutually slided in the extending direction of the sustaining electrodes 13.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 5 shows a perspective view of a conventional AC surface discharge type plasma display panel, and FIG. 6 shows a view of an electrode structure. As shown in FIG. 5, in a conventional panel 1, a front substrate 2 made of glass and a rear substrate 3 made of glass are arranged so as to face each other, and a gas that emits ultraviolet rays due to discharge, for example, a gas Encapsulated with neon and xenon. In FIG. 5, the front substrate 2 and the rear substrate 3 are shown separated from each other in order to make the drawing easier to see.

On the surface substrate 2, a pair of stripe-shaped scan electrodes 4 and sustain electrodes 5 are arranged in parallel in the row direction so that the scan electrodes 4 are adjacent to each other and the sustain electrodes 5 are adjacent to each other. Are arranged so that they are adjacent to each other. The scan electrode 4 and the sustain electrode 5 are covered with a dielectric layer 6, and a protective film 7 is formed on the dielectric layer 6. Each of the scan electrodes 4 and the sustain electrodes 5 has a metal bus bar 4 for increasing conductivity.
a and 5a and transparent electrodes 4b and 5b.
The transparent electrodes 4b and 5b have a function of spreading the discharge and causing the discharge to occur in a larger volume.

On the rear substrate 3, stripe-shaped write electrodes 11 covered with a dielectric layer 10 are arranged in parallel to each other in the column direction orthogonal to the scan electrodes 4 and the sustain electrodes 5, and the write electrodes are also arranged. The strip-shaped barrier ribs 8 for separating 11 and forming a discharge space are formed on the dielectric layer 1.
It is provided between the write electrodes 11 on 0. Further, a phosphor layer 9 is formed on the dielectric layer 10 and on the side surface of the partition wall 8.

As shown in FIG. 6, a discharge cell C1 is formed at the intersection of the write electrode 11 and the scan electrode 4 and the sustain electrode 5.
C2 ... Is formed. In FIG. 6, for example, the scan electrode 4 and the sustain electrode 5 arranged in the first row are shown as a scan electrode 4-1 and a sustain electrode 5-1 with a number indicating the row after the hyphen. . Metal busbar 4
The same notation is also used for a and 5a and the transparent electrodes 4b and 5b. The panel 1 configured as described above is configured so that an image display can be viewed from the surface substrate 2 side, and the phosphor layer 9 is generated by ultraviolet rays generated by the discharge between the scan electrode 4 and the sustain electrode 5 in the discharge space. Is excited and the visible light from the phosphor layer 9 is utilized for display light emission.

Next, regarding the conventional panel driving method,
This will be described with reference to FIG. 7, which shows an example of voltage waveforms applied to the scan electrode 4, the sustain electrode 5, and the write electrode 11.

[0007] As shown in FIG. 7, first, in the initialization period, an initialization pulse V _{se t} is applied to the scanning electrodes 4, to initialize the wall charges in the discharge cells of the panel. Next, in the writing period, the bias voltage V _scan is applied to the scan electrodes 4 other than the selected discharge cells, and the bias voltage V _scan is removed from the selected discharge cells and the write pulse V _data is applied to the write electrode 11 at the same time. , Generate write discharge. By this writing discharge, the dielectric layer 6 and the protective film 7
And wall charges are accumulated on the surface of the phosphor layer 9. The same write operation is sequentially performed over the entire panel to select the discharge cell to be displayed.

Next, in the sustain period, the write electrode 11
Is grounded, and the sustain pulse V _sus is alternately applied to the scan electrode 4 and the sustain electrode 5, so that in the discharge cell in which the wall charge is accumulated, the potential of the surface of the protective film 7 exceeds the discharge start voltage, so that discharge is generated. However, the sustain discharge is performed every time the sustain pulse is applied. After that, in the erase period, the erase pulse V _erase is applied to extinguish the wall charges and erase.

In such a conventional panel, the scanning electrode 4
The adjacent electrodes are adjacent to each other with a gap Xipg between adjacent cells, and the sustain electrodes 5 are adjacent to each other with a gap Xipg between adjacent cells. For example, in the discharge cell C1 and the discharge cell C2 adjacent to the discharge cell C1, the electrodes adjacent to each other via the inter-adjacent cell gap Xipg are the sustain electrodes 5-1.
And the sustain electrode 5-2. Therefore, the potentials on both sides of the gap Xipg between adjacent cells are the same, and it is difficult for discharge to occur here.

[0010]

However, even in the case of such an electrode arrangement, there is a problem that crosstalk is likely to occur during the writing period. Next, the process of the occurrence of crosstalk will be described.

The writing operation in the writing period is an operation for selecting a discharge cell to be displayed and a discharge cell not to be displayed, and is performed for each row before the sustain period (see FIG. 7). That is, at a certain timing, the scan pulse is applied to the scan electrode 4-1, and the row including the scan electrode 4-1 is selected. Since each discharge cell belonging to that row is provided with an independent write electrode 11, only the discharge cell to which a write pulse is applied to this write electrode 11 causes write discharge, accumulates wall charges, and A discharge can be generated during the sustain period. This behavior
The write operation is performed by sequentially performing each row.

The state of the writing discharge is shown in FIG.
A panel having the electrode structure of FIG.
2 is a cross-sectional view taken along a plane including the write electrode 11 belonging to FIG. In FIG. 8, the front substrate 2 and the rear substrate 3 are omitted, and the scan electrodes 4-1 and 4-2 and the sustain electrodes 5-1 and 5-1 are shown.
5-2 is shown by omitting the metal electrode.

The state immediately before the writing discharge is generated in the discharge cell C1 is shown in FIG. In order to easily cause the write discharge, the scan electrodes 4-1 and 4-
Negative wall charges are formed on the dielectric layer 6 above 2.
A negative scan pulse is applied to the scan electrode 4-1 of the discharge cell C1. Here, it is realized by removing the positive bias voltage V _scan . The bias voltage V _scan is applied as it is to the scan electrode 4-2 of the discharge cell C2 that does not cause the write discharge. At the same time when the scan pulse is applied to the scan electrode 4-1, the write electrode 11
Is applied with a positive write pulse V _data .

As a result, as shown in FIG. 8B, discharge is started between the scan electrode 4-1 and the writing electrode 11. At this time, since the state between the scan electrode 4-1 and the sustain electrode 5-1 is adjusted to a state close to the discharge start voltage, this discharge is used as a trigger to scan the scan electrode 4 as shown in FIG. 8C. -1 and the sustain electrode 5-1 also reach the discharge breakdown.

However, at this time, the sustain electrode 5-2 of the adjacent discharge cell C2 is at the same potential as the sustain electrode 5-1. Therefore, for example, when the distance between the sustain electrode 5-1 and the sustain electrode 5-2 is short in a high-definition panel, that is, when the gap Xipg between adjacent cells is narrow, as shown in FIG. The discharge may reach the sustain electrode 5-2. In this case, the wall charge in the discharge cell C2 changes, so that the discharge cell C2 emits light when it should not emit light, or conversely, the next write discharge cannot occur. There is a problem that the display becomes defective, such as being out of light.

The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel capable of preventing the occurrence of crosstalk.

[0017]

In order to achieve this object, the plasma display panel of the present invention has an electrode pair consisting of a scan electrode and a sustain electrode arranged with a discharge gap between them. In a plasma display panel in which a plurality of slits are provided on a substrate such that scan electrodes and sustain electrodes are adjacent to each other with a gap between adjacent cells, a plurality of slits are provided on the gap side between adjacent cells of the sustain electrodes, and the adjacent cells are provided. The slits provided in each of the sustain electrodes adjacent to each other via the inter-gap are arranged so as to be offset from each other in the extending direction of the sustain electrodes. This can prevent the occurrence of discharge in the gap between adjacent cells.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings of FIGS. 1 to
4, the same parts as those shown in FIGS. 5 to 8 are designated by the same reference numerals.

(Embodiment 1) FIG. 1 is a diagram showing a plasma display panel according to Embodiment 1 of the present invention, which is a schematic plane view showing the positional relationship among scan electrodes, sustain electrodes, barrier ribs and write electrodes. It is a figure. In addition,
The overall structure of the plasma display panel of the present invention is almost the same as the structure of the conventional panel shown in FIG. 5, except for the structure of the scan electrodes and sustain electrodes. The panel driving method is the same as the conventional driving method described with reference to FIG.

First, in the panel according to the first embodiment of the present invention, as in the conventional panel shown in FIG. 5, a front surface substrate 2 made of glass and a rear substrate 3 made of glass form a discharge space. Are arranged so as to face each other. The discharge space is filled with a mixed gas of xenon (Xe) and neon (Ne) as a discharge gas.

On the surface substrate 2, a pair of electrodes consisting of scan electrodes 12 and sustain electrodes 13 having a shape as shown in FIG. 1 extends in the row direction so that the scan electrodes 12 and the sustain electrodes 13 are adjacent to each other. , And the scan electrodes 12 and the sustain electrodes 13 are covered with the dielectric layer 6. On the dielectric layer 6, a protective film 7 made of a material such as magnesium oxide (MgO) having a high resistance to sputtering and a large secondary electron emission coefficient is formed.

A plurality of write electrodes 11 extending in the column direction are arranged on the rear substrate 3, and a dielectric layer 10 is formed so as to cover the write electrodes 11. Stripe-shaped barrier ribs 8 for forming discharge spaces are provided between the write electrodes 11 on the dielectric layer 10. A phosphor layer 9 is formed between the adjacent partition walls 8 so as to cover the dielectric layer 10 and the side surface of the partition wall 8. Phosphor layer 9
Are formed by using phosphor materials of the same color in the extending direction (column direction) of the writing electrode 11, and in the extending direction (row direction) of the electrode pair, for example, red, green, and blue are the three primary colors of fluorescence in this order. It is formed by sequentially using body materials.

This panel is designed so that the image display can be seen from the surface substrate 2 side which is the display surface side, and the phosphor layer 9 is excited by the ultraviolet rays generated by the discharge in the discharge space,
The generated visible light is used for display light emission.

Next, the electrode structure according to the first embodiment of the present invention will be described with reference to FIG. In FIG. 1, a region surrounded by a broken line represents a region of a discharge cell, which is formed at the intersection of the scan electrode 12 and the sustain electrode 13 and the write electrode 11. That is, in FIG. 1, the discharge cell C1 is formed at the intersection of the write electrode 11 with the scan electrode 12-1, the sustain electrode 13-1, and the scan electrode 12-2.
A discharge cell C2 is formed at the intersection of the sustain electrode 13-2 and the write electrode 11. One display pixel 16 as shown by the alternate long and short dash line in FIG. 1 is configured by the three discharge cells that display red, green and blue adjacently arranged in the extension direction of the electrode pair.

The scan electrode 12 and the sustain electrode 13 in the same discharge cell, for example, the scan electrode 12-1 and the sustain electrode 13-1 are arranged via the discharge gap Xmg, and the discharge generated in the discharge gap Xmg is mainly used. Used for display. In addition, a gap Xip between adjacent cells is formed between adjacent discharge cells, for example, between the sustain electrode 13-1 and the sustain electrode 13-2.
g, and similarly, an inter-cell gap Xipg is also provided between adjacent scan electrodes 12.

The scan electrode 12 and the sustain electrode 13 are composed of metal bus electrodes 12a and 13a and transparent electrodes 12b and 13b made of indium tin oxide (ITO) or the like, respectively. The bus electrodes 12a and 13a have a role of lowering the resistance of the entire electrodes, and the transparent electrodes 12b and 13b.
Defines the region where the discharge spreads. Then, slits 14 are formed by cutting on the side of the inter-adjacent cell gap Xipg of the transparent electrodes 12b and 13b of the scan electrode 12 and the sustain electrode 13. By providing the slit 14 on the side of the gap Xipg between the adjacent cells of the scan electrode 12 and the sustain electrode 13 as described above, the amount of wall charges accumulated in the portion above the slit 14 is reduced, and is formed between the slits 14. The amount of wall charges accumulated in the portion on the protrusion 15 is larger than the amount of wall charges accumulated in the portion on the slit 14.

In the panel of this embodiment, as shown in FIG.
As shown in FIG.
And the sustain electrodes 13-1 and 13-2 so that the slit 14 provided in the sustain electrodes 13-2 and the slits 14 provided in the sustain electrodes 13-2 do not face each other.
Are formed so as to be displaced from each other in the extension direction of. In this way, the sustain electrodes 13-1 and 13-2 are arranged and formed so that the protrusions 15, which are the portions where the wall charges are accumulated, do not come close to each other, so that the crosstalk in the writing period described above is performed. Can be prevented.

Further, in the present invention, the scanning electrode 12
Further, in the sustain electrode 13, the shape on the discharge gap Xmg side is a parallel straight line shape, and the gap Xi between adjacent cells is
The slit 14 is provided only on the pg side to prevent crosstalk from occurring. Similarly, if the discharge gap Xmg side also has the slit 14 or an electrode structure similar to the slit 14, the discharge start voltage in the discharge gap Xmg rises, and the wall charge near the discharge gap Xmg increases. Since the accumulated amount decreases, it becomes difficult for discharge to occur. Therefore, in the gap Xipg between adjacent cells, the accumulated wall charges are reduced to prevent crosstalk from occurring, and conversely, the discharge gap Xmg facilitates discharge.

As described above, the portions where the scan electrodes 12 and the sustain electrodes 13 face each other through the discharge gap Xmg are parallel to each other, and the gap Xipg between adjacent cells is parallel to each other.
As long as the electrode structure is provided with the slit 14 on the side, the structure of the other electrode portion may be arbitrary. For example, in the scan electrode 12 and the sustain electrode 13, the slit 1
4 may be provided with a hole having a predetermined shape in the vicinity of the center between the discharge gap Xmg side and the discharge gap 4 to reduce the current. Further, the parallel portion where scan electrode 12 and sustain electrode 13 face each other may not be parallel to the extending direction (row direction) of scan electrode 12 and sustain electrode 13.

Further, in the present embodiment, the slit 14 has a shape long in the direction (column direction) perpendicular to the extending direction (row direction) of the scan electrodes 12 and the sustain electrodes 13, that is, in the extending direction of the write electrode 11. There is. This is because the sustain discharge naturally occurs and the luminance is not further lowered.

For example, when a slit 14 which is long in the row direction is provided as shown in FIG. 2 (a), the discharge spreads along the protrusion 15 as shown by the meshing in the figure, and the slit 14 has a portion. Almost no discharge occurs. The cause is that the space between the protrusions 15 is too empty, so that the electric potential appearing on the dielectric layer 6 covering the slit 14 becomes too low, and the discharge on the region above the slit 14 occurs. Because it is not possible to attract, and because the wall charge accumulation becomes too small,
This is because the movement of charges due to discharge does not reach the area above the slit 14.

As a result, a dark portion is formed as the light emission distribution in the area on the slit 14, and the spread of the discharge is divided into two or more portions, so that the discharge may become unstable. Therefore, the projections 15 and the projections 15 are brought close to each other to some extent, and the plasma region becomes 2
In order not to be divided into three or more parts,
It is preferable to make the width (length in the row direction) of the slit 14 shorter than its depth (length in the column direction).

Further, each of the scan electrode 12 and the sustain electrode 13 has a slit 14 for one discharge cell.
It is preferable to provide one or more. This makes it easy to align the front substrate 2 and the rear substrate 3 with each other. If there is only one slit 14 in the discharge cell, the spread of the discharge changes depending on the position of the slit 14. For example, when a transparent electrode having a predetermined pattern is arranged so as to correspond to each discharge cell one by one (Japanese Patent Laid-Open No. 2000-243299) or a structure as shown in FIG. If the alignment between the substrate 2 and the back substrate 3 is misaligned and the position of the protrusion 15 is almost close to the partition wall 8, the wall surface of the partition wall 8 will not sufficiently spread the discharge to the protrusion 15. , The brightness is further reduced. Furthermore, if the deviation varies depending on the discharge cells in the panel surface,
This causes a large variation in brightness. This is because the number of slits 14 is one with respect to the discharge cells. Further, in the case of the structure of FIG. 2B, as indicated by the hatching in the figure, the discharge does not spread to the periphery of the protrusion 15 but only to the protrusion 15, and the brightness decreases. In order to secure the brightness, it is necessary to widen the width of the protrusion 15, but the wider the width, the lower the effect of suppressing the occurrence of crosstalk.

On the other hand, as shown in FIGS. 3 and 1, by forming the slits 14 in one discharge cell at a ratio of two or more, the same discharge state can be obtained regardless of the alignment accuracy. It is also possible to secure a range in which the discharge spreads, as indicated by hatching in FIG. Further, by making the protrusion 15 continuous in the direction outward from the discharge gap Xmg,
The spread of the discharge naturally occurs and the discharge does not become unstable.

Further, if the electrode pattern shape provided with the predetermined slits 14 is configured to be repeated in substantially the same pattern shape for each display pixel 16 in the extending direction of the scan electrode 12 and the sustain electrode 13, it is possible to obtain a certain pixel. In the pixel adjacent to it, the scan electrode 12 and the sustain electrode 13
Since the electrode shapes of 2 are always the same, uneven brightness or the like due to the difference in electrode shape does not occur. In the discharge cell forming the display pixel 16, it is not necessary to make the electrode shape of the discharge cell that displays red and the electrode shape of the discharge cell that displays blue the same, and the electrode shape is substantially the same for each display pixel 16. The slits 14 may be formed so that

(Embodiment 2) FIGS. 4 (a) to 4 (c) show an electrode structure according to Embodiment 2 of the present invention, and these drawings show the case where a slit 14 is provided in the scanning electrode 12. ing. In the electrode structure of the present embodiment, the slit 14
The width of the slit 14 becomes larger as it goes away from the discharge gap Xmg. For example, the slit 14 has a triangular shape as shown in FIG. 4A, a trapezoidal shape as shown in FIG. A U-shape such as is conceivable. The configuration other than the shape of the slit and the obtained effect are the same as those in the first embodiment, and the amount of wall charges accumulated in the vicinity of the inter-adjacent cell gap Xipg is reduced, so that it is further effective in suppressing the occurrence of crosstalk. is there. Further, as the discharge spreads to the outside, the potential gradually decreases and the accumulated wall charges decrease, so that the discharge can be spread naturally.

In the present invention, if a partition wall slightly lower than the partition wall 8 is disposed between the adjacent discharge cells, the effect of suppressing the occurrence of crosstalk can be further enhanced.
Further, in the above description, a case has been described in which three discharge cells that display red, blue, and green colors arranged in the row direction are combined into one display pixel, but the effect of the present invention is It can be obtained regardless of the form.

The driving method is the same as the conventional driving method described with reference to FIG. 7, but the initialization waveform and the sustain waveform do not have to be exactly as shown in FIG.
It suffices to drive so as to generate the write discharge by the three electrodes of the sustain electrode 13 and the write electrode 11 and the subsequent sustain discharge.

Further, in the above embodiment, the scanning electrode 12
And the slit 14 is formed in the sustain electrode 13,
By forming the slits 14 only on the sustain electrodes 13, the effect of preventing crosstalk can be obtained. As mentioned above, this is mainly due to the crosstalk
This is because two sustain electrodes 13 adjacent to each other through the inter-cell gap Xipg in the writing period have the same potential, and crosstalk is unlikely to occur in a portion where the scan electrodes 12 are adjacent to each other, but of course, it is described above. As described above, if the scan electrode 12 is also provided with the slit 14, the effect of preventing crosstalk can be further exerted.

[0040]

As described above, according to the present invention, it is possible to provide a plasma display panel in which display defects due to crosstalk are prevented.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an electrode structure of a plasma display panel according to a first embodiment of the present invention.

FIG. 2A is a schematic plan view showing the spread of discharge when the slit width is wide, and FIG. 2B is a schematic plan view showing the spread of discharge when one protrusion is arranged in the discharge cell.

FIG. 3 is a schematic plan view showing discharge spread when two slits of a discharge cell are provided in the electrode structure of the present invention.

4A to 4C are schematic plan views showing an electrode structure of a plasma display panel according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a main part of a conventional plasma display panel.

FIG. 6 is a schematic plan view showing an electrode structure of a conventional plasma display panel.

FIG. 7 is a waveform diagram showing a driving method of a conventional plasma display panel.

FIG. 8 is a cross-sectional view illustrating a process of writing discharge and crosstalk in a conventional plasma display panel.

[Explanation of symbols]

1 panel 2 front substrate 3 back substrate 4, 12 scanning electrodes 5, 13 Sustain electrode 6,10 Dielectric layer 7 protective film 8 partitions 9 Phosphor layer 11 Writing electrode 14 slits 15 Projection 16 display pixels

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryuichi Murai             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C040 FA01 GA02 GB03 GC02 GC06                       GC20 GF02 MA20

Claims (8)

[Claims] 1. A substrate in which an electrode pair including a scan electrode and a sustain electrode arranged with a discharge gap therebetween is provided, and a gap between adjacent cells is provided between the electrode pair so that the scan electrodes and the sustain electrodes are adjacent to each other. In a plurality of plasma display panels formed on the sustain electrode, a plurality of slits are provided on the side of the gap between adjacent cells of the sustain electrode, and the slit provided on each of the adjacent sustain electrodes through the gap between the adjacent cells is the sustain electrode. A plasma display panel, wherein the plasma display panels are arranged so as to be offset from each other in the extension direction of the. 2. A plurality of slits are provided on the side of the gap between adjacent cells of the scan electrode, and slits provided on each of the scan electrodes adjacent to each other through the gap between the adjacent cells,
The plasma display panel according to claim 1, wherein the scanning electrodes are arranged so as to be offset from each other in the extending direction of the scanning electrodes. 3. A discharge cell is formed at an intersection of an electrode pair and a write electrode by forming a write electrode in a direction perpendicular to the electrode pair on a substrate arranged to face the substrate on which the electrode pair is formed. The plasma display panel according to claim 1, wherein the discharge electrode is formed so that two or more slits provided in the sustain electrode are present in each discharge cell. 4. A display pixel is composed of three discharge cells arranged adjacent to each other in the extending direction of the electrode pair, and slits are formed so that the display pixels in the extending direction have substantially the same pattern shape. The plasma display panel according to claim 1, wherein: 5. The plasma display panel according to claim 1, wherein the slit has a shape elongated in the extending direction of the writing electrode. 6. The plasma display panel according to claim 1, wherein the slit has a shape in which the width increases as the distance from the discharge gap increases. 7. The plasma display panel according to claim 6, wherein the slit has a triangular shape, a trapezoidal shape, or a U shape. 8. The plasma display panel according to claim 1, wherein the shapes of the scan electrodes and the sustain electrodes on the discharge gap side are linear.