JP2001076627A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent crosstalk between adjacent electrodes in a plasma display. SOLUTION: A back glass substrate on which address electrodes 6 are formed, and a front glass substrate 1 on which X-electrodes 3 and Y-electrodes 4 are extended perpendicularly to the address electrodes 6 are provided, and the front glass substrate 1 and the back glass substrate 2 are disposed to face each other through barrier ribs in such a way that discharge cells are set at points where the address electrodes 6 cross with the X- and Y-electrodes 3, 4 to form a three-electrode structure in this AC type surface discharge plasma display panel. In this case, the X-electrodes and the Y-electrodes are arranged in the order of XYYX, and a crosstalk preventing electrode 16 to which a prescribed voltage is applied is inserted between the two adjacent Y-electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plasma display panel (hereinafter abbreviated as PDP).

[0002]

2. Description of the Related Art There are various types of PDPs, and at present, an AC type surface discharge type having a three-electrode structure as described in Japanese Patent Application Laid-Open No. Hei 5-307935 is generally used.

[0003] A PDP of this type is composed of a front glass substrate and a rear glass substrate. Plural sets of X sustain electrodes (X sustain electrodes) and Y sustain electrodes (Y sustain electrodes) each including a transparent electrode and a bus electrode are formed inside the front glass substrate. These are simply called X electrodes, Y electrodes or collectively as sustain electrodes. In the following, the one to which a negative voltage is applied at the time of address discharge is called a Y electrode and the other is called an X electrode for convenience. The sustain electrode is covered with a dielectric layer made of several materials. A plurality of bases and address electrodes are provided on the rear glass substrate, and are covered with a dielectric and a phosphor. Each address electrode is partitioned by a partition. The front glass substrate and the rear glass substrate are combined so as to keep a certain gap, and the discharge space between them is N
A mixed gas mainly composed of a rare gas such as e or Xe is sealed. Xe is a gas that emits ultraviolet light for causing the phosphor to emit light, and Ne is a buffer gas. When a discharge occurs for displaying an image, visible light from the phosphor is radiated through the front substrate. The display screen is composed of a large number of pixels, and each pixel is composed of three discharge cells: a cell coated with a red phosphor, a cell coated with a green phosphor, and a cell coated with a blue phosphor.

The above-mentioned three-electrode structure AC type surface discharge type PDP
Is typically driven by dividing one frame for a period of 16.7 ms into a plurality of subfields. Each field is displayed using a reset discharge period for erasing wall charges in all cells, an address discharge period in which wall charges are formed only in cells to be discharged according to display information, and a wall charge formed by address discharge. A sustain discharge (sustain discharge) period in which a discharge according to an image is performed. Multi-tone display of an image is realized by changing the length of the sustain discharge period in each sub-field.
This is realized by combining discharges of cells coated with blue phosphor.

The arrangement method of the sustain electrodes of the three-electrode structure AC type surface discharge type PDP is roughly classified into two. In the conventional standard method, the sustain electrodes are arranged in the direction of extension of the address electrodes in the order of XYXY or YXYX. Another method is to arrange the sustain electrodes in the order of XYYX. With this configuration, the electrodes to which the same phase voltage is applied during the sustain discharge are adjacent to each other, so that the electrode gap between adjacent cells can be shortened, and the panel area can be increased by increasing the electrode area and increasing the aperture ratio. Brightness can be improved. The aperture ratio is defined by the ratio of the total area of the unit discharge cell to the area of the plasma discharge region in the cell determined by the electrode area.

[0006]

However, the latter arrangement method has a problem that image noise is generated due to crosstalk between adjacent Y electrodes. An object of the present invention is to prevent crosstalk between adjacent electrodes in a plasma display.

[0007]

SUMMARY OF THE INVENTION In a plasma display panel including at least one substrate on which a plurality of electrodes extending in parallel with each other are formed, between adjacent electrodes, in order to prevent crosstalk between the electrodes, A crosstalk prevention electrode to which a predetermined voltage is applied is inserted.

By doing so, it is possible to increase the aperture ratio by reducing the distance between the electrodes, and to improve the panel luminance without generating crosstalk noise.

A first substrate on which an address electrode group is formed; and a second substrate on which a first sustain electrode group and a second sustain electrode group extending perpendicular to the address electrode group are formed. A three-electrode structure in which the first and second substrates are opposed to each other via a partition so that a discharge cell is defined in a region where the address electrode group intersects with the first and second sustain electrode groups. In an AC type surface discharge plasma display panel, a third electrode extending in parallel with the first and second sustain electrodes and having a predetermined voltage applied during an address discharge is inserted between adjacent discharge cells. It is characterized by.

By doing so, in an AC type surface discharge plasma display panel having a three-electrode structure, the area of the electrodes is increased and the aperture ratio is increased, without causing crosstalk between the electrodes, and a high-brightness clear image is obtained. Images can be displayed.

A first substrate on which an address electrode group is formed, and a second substrate on which a first sustain electrode group and a second sustain electrode group extending perpendicular to the address electrode group are formed; A three-electrode structure in which the first and second substrates are opposed to each other via a partition so that a discharge cell is defined in a region where the address electrode group intersects with the first and second sustain electrode groups. In the AC surface discharge plasma display panel, the first and second sustain electrode groups are arranged in an order such that a pair of second sustain electrodes are sandwiched between a pair of first sustain electrodes, and In order to prevent crosstalk between the second sustaining electrodes, a crosstalk preventing electrode to which a predetermined voltage is applied is inserted between the pair of second sustaining electrodes.

By doing so, it is possible to prevent crosstalk between electrodes in an AC type surface discharge plasma display panel having a three-electrode structure with a high aperture ratio and high luminance.

A first substrate on which an address electrode group is formed, and a second substrate on which a first sustain electrode group and a second sustain electrode group extending perpendicular to the address electrode group are formed; The first and second substrates are opposed to each other via a partition so that a discharge cell is defined in a region where the address electrode group intersects with the first and second sustain electrode groups. A method of driving an AC type surface discharge plasma display panel having a three-electrode structure in which the first and second sustain electrode groups are arranged in an order such that a pair of second sustain electrodes are sandwiched between the sustain electrodes. At the time of the address discharge, at least a part of the space between the second sustain electrodes is set to a potential lower than the potential of the plasma generated by the address discharge in order to prevent crosstalk between the pair of second sustain electrodes. Features To.

By doing so, the AC type surface discharge plasma display panel having a three-electrode structure with a high aperture ratio and high luminance can be driven without causing crosstalk of the second sustaining electrode.

During the sustain discharge, the potential of at least a part of the space between the pair of second sustain electrodes and the potential of the second sustain electrodes can be made substantially equal.

By doing so, it is possible to prevent the occurrence of crosstalk between the space between the two sustain electrodes and the sustain electrode during the sustain discharge.

In a plasma display panel comprising discharge cells defining pixels, a crosstalk prevention electrode to which a predetermined voltage is applied to a boundary region between pixels is provided in order to prevent crosstalk between adjacent pixels. It is characterized by being arranged.

By doing so, in the plasma display panel, it is possible to prevent the influence of the charges of the adjacent pixels and display a clear image without noise.

[0019]

FIG. 1 is a sectional view of a PDP according to the present invention. In this figure, 1 is a front glass substrate, 2 is a rear glass substrate, 3 is an X sustain electrode (transparent electrode), 4 is a Y sustain electrode (transparent electrode), 5 is a dielectric provided on the front substrate, and 6 is an address. Electrode, 7 a dielectric covering the address electrode, 9 a discharge space, 10 a bus electrode, 11 a phosphor layer, 12 a secondary electron emitting material such as MgO, 13 a height of the discharge space, 14 a unit The width of the discharge cell, 15 is a black matrix for preventing bleeding, 16 is a crosstalk prevention electrode, and 18 is an electrode gap between adjacent cells.

FIG. 1 shows two discharge cells. In practice, these two cells are periodically arranged.
In the following, the cell on the left side of FIG. 1 is called an odd cell, and the cell on the right side is called an even cell. The structure without the crosstalk prevention electrode 16 in the structure of FIG. 1 is called a conventional structure.

FIG. 2 illustrates the state of address discharge in the odd-numbered cells of the PDP. As shown in FIG. 2, the X electrode 3 of the odd cell has a voltage of 70 V and the Y electrode 4 has a voltage of -70 V.
140V, -40V for the Y electrode 4 of the even cell, X electrode 3
, A voltage of 0 V is applied to the crosstalk prevention electrode 16, and a voltage of 70 V is applied to the address electrode 6. These voltage values are typical values, the dimensions of the discharge cells,
Note that it depends on the material and the filling gas.

The voltage applied to the crosstalk prevention electrode 16 is 0 V in this case, but may be lower than the potential of the discharge plasma 17 (approximately 50 V when the above voltage is applied to each electrode).

FIG. 3 shows the distribution of wall charges generated by the odd-numbered cell address discharge. As you can see from this figure,
A substantially uniform negative wall charge (about -1/10 ⁴ C / m ² ) is generated on the entire surface of the phosphor layer 11 in the odd-numbered cells.
The surface of No. 12 has about -2.3 / 10 ⁴ C / m on the X electrode.
² negative wall charges are formed, about 6/10 ⁴ C on the Y electrode.
/ M ² of positive wall charge is generated.

For comparison, FIG. 4 shows a conventional PDP.
2 shows the distribution of wall charges generated by the odd cell address discharge when the same electrode voltage is applied. As can be seen from this figure, there is no significant difference in the wall charge distribution between the structure of FIG. 1 and the conventional structure.

Next, the address discharge of the even-numbered cells, which is performed after the address discharge of the odd-numbered cells, will be described with reference to FIG. As shown in FIG. 5, in the even cell address discharge, 0 V is applied to the X electrode 3 and -40 is applied to the Y electrode 4 of the odd cell.
V, a voltage of −140 V is applied to the Y electrode 4, a voltage of 70 V to the X electrode 3, a voltage of 0 V to the crosstalk prevention electrode 16, and a voltage of 70 V to the address electrode 6 of the even cell. These applied voltages are also typical values as in the case of FIG.
Note that it depends on the conditions.

The even cell address discharge is significantly different from the case of FIG. 2 in that wall charges formed by the preceding odd cell address discharge already exist. A positive wall charge is formed on the Y electrode of the odd cell, and the total voltage on the Y electrode of the odd cell obtained by adding the wall voltage due to the wall charge and the electrode applied voltage is about 100V. The electric field generated by this voltage attracts electrons and causes crosstalk. Crosstalk is suppressed by applying 0V sufficiently lower than the plasma potential to the crosstalk prevention electrode 16.

FIG. 6 shows a distribution of wall charges generated by an odd-numbered cell address discharge followed by an even-numbered cell address discharge.
As can be seen from this figure, the distribution of the wall charges is substantially the same between the odd-numbered cells and the even-numbered cells, and is symmetrical.
There is no difference between the wall charge distribution of the odd-numbered cells shown in FIG. 3 and the wall charge distribution of the odd-numbered cells shown in FIG. 6, indicating that no crosstalk has occurred.

For comparison, FIG. 7 shows a wall charge distribution generated by an even cell address discharge in the conventional structure. As can be seen from this figure, the wall charge distribution is significantly different between the odd-numbered cells and the even-numbered cells due to the crosstalk of the electrons moving from the even-numbered cells to the odd-numbered cells. In particular, the wall charge density on the Y electrode of the odd-numbered cell is 3/10 ⁴ C / m ² or less, which is less than half that in FIG. Such asymmetric wall charge distribution causes image noise due to a sustain discharge failure of an odd-numbered cell in a sustain discharge subsequent to an address discharge.

During the sustain discharge, in order to prevent crosstalk between the crosstalk electrode and the Y electrode adjacent thereto and to reduce the capacitance load seen from the driving circuit, the crosstalk prevention electrode is provided with a Y electrode. It is preferable to apply the same voltage as the voltage applied to the electrodes.

According to the above embodiment, the sustain electrodes are arranged in the order of XYYX, and the three-electrode structure AC type surface discharge type PDP in which the aperture ratio is increased to improve the panel luminance.
In this case, it is possible to prevent noise from occurring due to crosstalk and display a clear image.

The case where the present invention is applied to a three-electrode structure AC type surface discharge type PDP has been described above. However, the present invention is not limited to this. The present invention can be applied to prevent crosstalk between electrodes in various types of PDPs.

[0032]

According to the present invention, in a plasma display, crosstalk between adjacent electrodes can be prevented, the aperture ratio can be increased without generating noise, and the luminance can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the PDP of the present invention.

FIG. 2 is an explanatory diagram of an odd cell address discharge of the PDP of FIG. 1;

FIG. 3 is a diagram showing a distribution of wall charges generated by an odd cell address discharge of FIG. 2;

FIG. 4 is a diagram showing a distribution of wall charges generated by an odd cell address discharge of a PDP having a conventional structure.

FIG. 5 is an explanatory diagram of an even cell address discharge of the PDP of FIG. 1;

6 is a diagram showing a distribution of wall charges generated by the even-numbered cell address discharge in FIG. 5;

FIG. 7 is a diagram showing a distribution of wall charges generated by an even cell address discharge of a PDP having a conventional structure.

[Explanation of symbols]

 1: Front glass substrate 2: Rear glass substrate 3: X sustain electrode 4: Y sustain electrode 5: Dielectric 6: Address electrode 7: Dielectric 9: Discharge space 10: Bus electrode 11: Phosphor layer 12: Secondary electron Emitting material 13: Height of discharge space 14: Width of unit discharge cell 15: Black matrix 16: Crosstalk prevention electrode 17: Plasma discharge region 18: Electrode gap between adjacent cells

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eiji Fukumoto 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi, Ltd.Hitachi Research Laboratories Co., Ltd. Hitachi, Ltd. Central Research Laboratory Co., Ltd. HH02 HH04 JJ05 JJ06

Claims (6)

[Claims] 1. A plasma display panel having at least one substrate on which a plurality of electrodes extending in parallel with each other is formed, a predetermined voltage is applied between adjacent electrodes to prevent crosstalk between the electrodes. A plasma display panel comprising a crosstalk prevention electrode formed therein. 2. A first substrate on which an address electrode group is formed, and a second substrate on which a first sustain electrode group and a second sustain electrode group extending orthogonally to the address electrode group are formed. A three-electrode in which the first and second substrates are opposed to each other via a partition so that a discharge cell is defined in a region where the address electrode group intersects with the first and second sustain electrode groups. In an AC type surface discharge plasma display panel having a structure, a third electrode extending in parallel with the first and second sustain electrode groups and having a predetermined voltage applied during sustain discharge is provided between adjacent discharge cells. A plasma display panel characterized by being inserted. 3. A first substrate on which an address electrode group is formed, and a second substrate on which a first sustain electrode group and a second sustain electrode group extending orthogonally to the address electrode group are formed. A three-electrode in which the first and second substrates are opposed to each other via a partition so that a discharge cell is defined in a region where the address electrode group intersects with the first and second sustain electrode groups. In the AC type surface discharge plasma display panel having a structure, the first and second sustain electrode groups are arranged in an order such that a pair of second sustain electrodes are sandwiched between a pair of first sustain electrodes. A plasma display panel, wherein a crosstalk prevention electrode to which a predetermined voltage is applied is inserted between the pair of second sustain electrodes to prevent crosstalk between the pair of second sustain electrodes. 4. A first substrate on which an address electrode group is formed, and a second substrate on which a first sustain electrode group and a second sustain electrode group extending orthogonal to the address electrode group are formed. The first and second substrates are arranged opposite to each other via a partition so that a discharge cell is defined in a region where the address electrode group intersects with the first and second sustain electrode groups. A method of driving an AC type surface discharge plasma display panel having a three-electrode structure in which the first and second sustain electrode groups are arranged in such an order that a pair of second sustain electrodes are sandwiched between the first sustain electrodes. In the method, at the time of an address discharge, at least a part of the space between the second sustain electrodes is set to a potential lower than the potential of plasma generated by the address discharge in order to prevent crosstalk between the pair of second sustain electrodes. Features to set Driving method for a plasma display panel. 5. The method of driving a plasma display panel according to claim 4, wherein at the time of sustain discharge, the potential of at least a part of the space between the pair of second sustain electrodes and the potential of the second sustain electrodes are changed. A method for driving a plasma display panel, wherein the potential is substantially equalized. 6. A plasma display panel comprising a crosstalk prevention electrode to which a predetermined voltage is applied in a boundary region between pixels in order to prevent crosstalk between adjacent pixels.