JP2003151443A - Ac type plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormal discharge beyond a space between discharge cells. SOLUTION: A scanning electrode 3 is exposed to a discharge space without exposing it through a dielectric layer 2. Thereby, an absolute potential in a discharge cell 11 is fixed by an external voltage, net charge-transfer between discharge cells 11 is suppressed, and abnormal discharge beyond the space between the discharge cells is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC type plasma display panel used for displaying images on a television receiver and an information display terminal.

[0002]

2. Description of the Related Art Conventionally, the panel structure of a plasma display panel has a structure as shown in FIG. 9 and 1
Reference numeral 0 indicates a sectional view taken along the x and y directions, respectively. A pair of scan electrodes 23 and sustain electrodes 24 covered with a dielectric layer 22 are provided in parallel with each other on the front substrate 21, and these scan electrodes 23 and sustain electrodes 24 are transparent electrodes. 23a, 24a and electrodes 23b, 24b made of a metallic material.

A protective film 25, which is an easily dischargeable insulating film, is formed on the dielectric layer 22.

A data electrode 28 covered with an insulating layer 27 is provided on the rear substrate 26, and a partition 29 is provided on the insulating layer 27 between the data electrodes 28 in parallel with the data electrode 28. . In addition, from the surface of the insulator layer 27 to the partition 29
The phosphor layer 30 is provided over the side surface of the scanning electrode 23.
The front substrate 21 and the rear substrate 26 are arranged to face each other across the discharge space 31 so that the sustain electrode 24 and the data electrode 28 intersect. At least one of helium, neon, and argon and xenon are enclosed in the discharge space 31 as discharge gas.

Next, a panel driving method will be described with reference to FIG. First, in the initializing period, the initializing discharge is generated between all the pairs of scan electrodes 23 and the sustain electrodes 24 to erase the wall voltage between the scan electrodes 23 and the sustain electrodes 24, and at the same time, all the scan electrodes 23 are formed. And data electrode 2
An initializing discharge is generated between the electrodes 8 and 8 and the wall voltage required for the writing operation is accumulated between the scan electrode 23 and the data electrode 28.

In the subsequent writing period, a scanning pulse is applied to one scanning electrode 23 and the data electrode 2 corresponding to the discharge cell 32 for writing the display data.
A writing pulse is applied to 8 to generate a writing discharge in the discharge cell 32 to perform the writing operation. This writing operation is sequentially performed on all the scanning electrodes 23.

During the following sustain period, all scan electrodes 2
Display is performed by alternately applying sustain discharge pulses to the sustain electrodes 3 and the sustain electrodes 24 to generate discharges in the discharge cells that have undergone the write discharge and cause the phosphor layer 30 to emit light.

[0008]

However, when an image is displayed on a conventional panel, an instantaneous abnormal discharge from several discharge cells to several tens of discharge cells is randomly generated in the panel surface, and the display quality is deteriorated. It was found to cause a decline. This is because when each discharge cell is electrically completely separated, the charge transfer is completed inside each discharge cell and the average potential of the cell is constant, but the actual discharge cell structure is Since they are connected in the vertical direction as described above, substantial charge transfer occurs between the upper and lower discharge cells.
If the charge transfer between these discharge cells continues for a long time,
It is considered that abnormal electric charges having opposite polarities are accumulated in the upper part and the lower part of the panel lighting portion, and when the electric charges exceed a certain limit value, the accumulated electric charges are discharged across the discharge cells at once and appear as an abnormal electric discharge phenomenon.

In order to solve the above-mentioned abnormal discharge phenomenon, a structure in which a bypass electrode for releasing the above-mentioned abnormal charge is provided inside the panel, a method of adding a conductive material to the dielectric layer covering each electrode to increase the conductivity, etc. Is proposed. However, the above abnormal discharge phenomenon has not been completely suppressed.

The present invention has been made to solve the above problems, and an object thereof is to provide a panel structure capable of completely suppressing the above-mentioned abnormal discharge phenomenon.

[0011]

In order to solve this problem, a plasma display panel according to the present invention has a discharge space in which any one of a data electrode, a scan electrode, and a sustain electrode is not interposed via a dielectric. The absolute potential inside the discharge cells is fixed by the external voltage by exposing the discharge cells to suppress the net charge transfer between the discharge cells. With this configuration, the above-mentioned abnormal discharge phenomenon can be completely suppressed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION That is, according to the first aspect of the present invention, a pair of substrates, at least the front side of which are transparent, are arranged so as to face each other so that a discharge space is formed between the substrates, and the discharge space is a partition wall. In an AC type plasma display panel in which a plurality of discharge cells are provided by partitioning and a scan electrode and a sustain electrode are arranged in parallel on a front substrate so that a main discharge is generated in the discharge cell, It is characterized in that one of them is covered with a dielectric layer and the other electrode is not covered with the dielectric layer.

The invention according to claim 2 of the present invention is
A plurality of discharge cells are provided by arranging a pair of substrates, at least the front surface side of which is transparent, so as to face each other so that a discharge space is formed between the substrates, and partitioning the discharge space with partition walls.
Further, in the AC type plasma display panel in which the scan electrodes and the sustain electrodes are arranged in parallel on the front substrate so that the main discharge is generated in the discharge cells, one of the scan electrodes or the sustain electrodes is formed on the front substrate. With
A dielectric layer is formed so as to cover the electrode, the other electrode is formed on the dielectric layer, and a protective film including the dielectric layer is formed thereon. is there.

Further, in the invention according to claim 3 of the present invention, a pair of substrates, at least the front side of which are transparent, are arranged so as to face each other so that a discharge space is formed between the substrates, and the discharge space is partitioned by partition walls. AC plasma display in which a plurality of discharge cells are provided, scanning electrodes are provided on the front substrate so that write discharge is generated in the discharge cells, and data electrodes are disposed on the rear substrate in a direction orthogonal to the scanning electrodes. In the panel, the data electrode is not covered with a dielectric layer.

Further, in the present invention, a phosphor is formed on the data electrode, and the phosphor is a conductive phosphor having a body resistivity of 10 ¹⁰ Ωcm or less. Further, the conductive phosphor is one containing ZnO or ITO.

A plasma display panel according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an example of a panel structure in a plasma display panel according to an embodiment of the present invention, and FIGS. 2 and 3 show cross sections cut in the x and y directions, respectively. As shown in FIGS. 1 to 3, a transparent electrode 4a is provided on a transparent front substrate 1 such as a glass substrate.
And a plurality of stripe-shaped sustain electrodes 4 made of a bus bar 4b of a metallic material such as silver are formed, and a dielectric layer 2 is formed so as to cover the plurality of sustain electrodes 4, and further on the dielectric layer 2. A plurality of stripe-shaped sustain electrodes 3 composed of a transparent electrode 3a and a bus bar 3b made of a metallic material such as silver are formed as another scan electrode group forming a main discharge electrode pair on the surface of the main discharge electrode pair to facilitate easy discharge. A protective film 5 which is a conductive insulating film is formed.

A plurality of stripes covered with an insulating layer 7 are formed on the rear substrate 6 facing the front substrate 1 in a direction orthogonal to the scan electrodes 3 and the sustain electrodes 4. Data electrodes 8 are formed. These substrates 1
The substrate 6 and the substrate 6 are arranged so as to oppose each other with a minute discharge space therebetween so that the scan electrodes 3 and the sustain electrodes 4 and the data electrodes 8 are orthogonal to each other, and the periphery thereof is sealed. One of helium, neon, argon, and xenon or a mixed gas is enclosed as a discharge gas. Further, the discharge space is partitioned into a plurality of sections by partition walls 9, so that a plurality of discharge cells 11 where the intersections of the display electrodes, which are the scan electrodes and the sustain electrodes, and the data electrodes 8 are located.
In each of the discharge cells 11, red, green and blue phosphor layers 10 are sequentially arranged one by one.

4 to 6 show an example of a panel structure in a plasma display device according to another embodiment of the present invention. As shown in the figure, a plurality of pairs of stripe-shaped display electrodes, each of which is composed of a scanning electrode 3 and a sustaining electrode 4, are formed on a transparent front substrate 1 such as a glass substrate. The scan electrodes 3 and the sustain electrodes 4 are composed of transparent electrodes 3a and 4a and bus bars 3b and 4b of silver or the like electrically connected to the transparent electrodes 3a and 4a, respectively. A dielectric layer 2 is formed on the front substrate 1 so as to cover the plurality of pairs of electrodes, and a protective film 5 which is an easily dischargeable insulating film is formed on the dielectric layer 2. ing.

A plurality of stripe-shaped data electrodes 8 are formed in a direction orthogonal to the scan electrodes 3 and the sustain electrodes 4 on the back-side substrate 6 arranged to face the front-side substrate 1. There is. A plurality of stripe-shaped partition walls 9 are arranged in parallel between the data electrodes 8. Further, on the side surface between the partition walls 9 and the surface of the data electrode 8, the conductive phosphor layer 12 is directly formed without forming the insulator layer 7.

The substrate 1 and the substrate 6 are the scanning electrodes 3
And the sustain electrodes 4 and the data electrodes 8 are orthogonal to each other,
The discharge spaces are opposed to each other with a minute discharge space interposed therebetween, and the periphery thereof is sealed, and one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas in the discharge space. Then, the discharge space is divided into a plurality of sections by partition walls 9, so that a plurality of discharge cells 11 where the intersections of the display electrodes and the data electrodes 8 are located.
, And red, green and blue phosphor layers 12 are arranged in each discharge cell 11.

[0022] Here, the phosphor layer 12 is formed using a mixed material of an insulating fluorescent material and a conductive material, the body resistivity of 10 ¹⁰ [Omega] cm or less in 10 ⁸ [Omega] cm
It has a degree of conductivity. As the conductive material, powdery or whisker (branch) zinc oxide (ZnO) is used.

Next, the operation of the panel according to the present embodiment shown in FIGS. 1 to 6 will be described with reference to FIG. 7 in comparison with the operation of the conventional panel.

FIG. 7A shows an example of drive waveforms.
(B) to (f) show the movement of the wall charge at each timing when the discharge cell is driven, the white circles represent negative charges, and the black circles represent positive charges. 7B to 7F, SC is a scan electrode, SU is a sustain electrode, and D is a data electrode.

As shown in FIG. 7B, the change in the wall charge of the discharge cell in the conventional example is such that the scan electrode SC and the sustain electrode SU are kept at substantially the same potential after the completion of the initialization and the scan electrode SC. Wall charges are formed between the data electrodes D to the extent that a potential difference of about 100 V is generated. At the time of writing, discharge between scan electrode SC and data electrode D is triggered to induce discharge between scan electrode SC and sustain electrode SU, and negative and positive wall charges are formed on scan electrode SC and sustain electrode SU, respectively. It In the sustain period, the polarities of the charges formed on the scan electrode SC and the sustain electrode SU are repeatedly inverted as the sustain pulse is applied.

At this time, what is important in operation is not the absolute value of the charge accumulated on each electrode but the relative difference in charge amount between the electrodes, or the same thing. It is the potential difference created by the applied charge. Therefore, normally, even if the entire cell is positively charged or negatively charged as shown in FIG. 7C or 7D, no problem occurs in operation. However, if this charging becomes too large, abnormal discharge may occur over several cells or several tens of cells as described above.

FIG. 7E is a conceptual diagram showing the operation of the wall charges of the panel in the embodiment shown in FIGS. In the present embodiment, scan electrode SC is directly exposed to the discharge space without being covered with the dielectric. Further, FIG. 7F is a conceptual diagram showing movement of wall charges of the panel in the embodiment shown in FIGS. In the present embodiment, the data electrode D is not covered with the dielectric and is exposed to the discharge space via the fluorescent substance having conductivity.

Therefore, wall charges are not formed on the scan electrodes in the embodiments shown in FIGS. 1 to 3, and wall charges are not formed on the data electrodes D in the embodiments shown in FIGS. Although not formed, the potential difference between the electrodes is the same as in the conventional example in any of the examples.

That is, for example, the potential difference between the scan electrode SC and the sustain electrode SU after the completion of the initialization is shown in FIGS.
All the same up to (f), the scan electrode S in FIG.
C and the sustain electrode SU each have a single white circle. In FIG. 7E, there is no wall charge in both the scan electrode SC and the sustain electrode SU.
In (f), there are two white circles for both the scan electrodes SC and the sustain electrodes SU. The potential difference between the scan electrode SC and the data electrode D is also shown in FIG.
7B to FIG. 7F are the same, and FIG.
Then, the scan electrode SC has one white circle, the data electrode D has one black circle, and the difference is two black circles on the data electrode D side, which are positively charged. In FIG. 7E, there is no wall charge on the scan electrode SC and the data electrode has a black circle. The difference between the two is that the data electrode D side is positively charged by the two black circles, and the scan electrode SC is the white circle 2 in FIG. 7 (f).
On the other hand, there is no wall charge on the data electrode D, and the difference is that the data electrode D side is positively charged by two black circles.

Therefore, the write operation similar to the conventional one can be performed with all the patterns shown in FIGS. 7 (b) to 7 (f). In the subsequent sustaining operation as well, the potential difference between the electrodes becomes the same in all the patterns of FIGS. 7B to 7F, and thus the same operation as the conventional one can be performed.

Here, in the embodiments shown in FIGS. 4 to 6, the material is a mixture of an insulating phosphor material and a conductive material, and the conductive material is powder or whiskers. Although (dendritic) zinc oxide (ZnO) was used,
The same effect can be obtained by using indium oxide (In ₂ O ₃ ), tin oxide (SnO ₂ ), indium tin oxide (ITO) or the like in addition to ZnO. It is not limited to those shown.

[0032]

As described above, according to the AC type plasma display panel of the present invention, one of the data electrode, the scan electrode and the sustain electrode is directly connected to the discharge space without interposing the dielectric. Since the absolute potential inside the discharge cells is fixed by the external voltage due to the exposure, it is possible to suppress the net charge transfer between the discharge cells, thereby completely suppressing the abnormal discharge phenomenon.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a plasma display panel according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the panel in the x direction.

FIG. 3 is a cross-sectional view of the panel in the y direction.

FIG. 4 is an exploded perspective view of a plasma display panel according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of the panel in the x direction.

FIG. 6 is a cross-sectional view of the panel in the y direction.

7A to 7F are drive waveform diagrams and wall charge conceptual diagrams for explaining the operation of the present invention.

FIG. 8 is an exploded perspective view of a conventional plasma display panel.

FIG. 9 is a cross-sectional view of the panel in the x direction.

FIG. 10 is a cross-sectional view of the panel in the y direction.

FIG. 11 is a drive waveform diagram of the panel.

[Explanation of symbols] 1 Front side substrate 2 Dielectric layer 3 scanning electrodes 4 sustaining electrodes 5 protective film 6 Rear side substrate 7 Insulator layer 8 data electrodes 9 partitions 10,12 Phosphor layer 11 discharge cells

Claims (5)

[Claims] 1. A plurality of discharge cells are provided by arranging a pair of substrates, at least front side of which are transparent, so as to face each other so that a discharge space is formed between the substrates, and partitioning the discharge space by partition walls to provide a plurality of discharge cells. A scan electrode and a sustain electrode are arranged in parallel on the front substrate so that a main discharge is generated at
In the C-type plasma display panel, one of the scan electrode and the sustain electrode is covered with a dielectric layer, and the other electrode is not covered with the dielectric layer. 2. A plurality of discharge cells are provided by arranging a pair of substrates, at least front sides of which are transparent, so as to face each other so that a discharge space is formed between the substrates, and partitioning the discharge space with partition walls to provide a plurality of discharge cells. A scan electrode and a sustain electrode are arranged in parallel on the front substrate so that a main discharge is generated at
In a C-type plasma display panel, one of the scan electrode and the sustain electrode is formed on a front substrate, a dielectric layer is formed so as to cover the electrode, and the other electrode is formed on the dielectric layer. And a protective film including the above-mentioned dielectric layer are formed on the AC plasma display panel. 3. A plurality of discharge cells are provided by arranging a pair of substrates, at least the front side of which are transparent, so as to face each other so that a discharge space is formed between the substrates, and partitioning the discharge space with partition walls to provide a plurality of discharge cells. A scan electrode is provided on the front substrate so that a write discharge is generated at the data electrode, and a data electrode is arranged on the back substrate in a direction orthogonal to the scan electrode.
In the C-type plasma display panel, the data electrode is not covered with a dielectric layer.
Type plasma display panel. 4. The AC type plasma display panel according to claim 3, wherein a phosphor is formed on the data electrode, and the phosphor is a conductive phosphor having a body resistivity of 10 ¹⁰ Ωcm or less. . 5. The AC type plasma display panel according to claim 4, wherein the conductive phosphor contains ZnO or ITO.