JP2001319577A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel capable of preventing a mal-function of discharging in writing through an irregular alignment, and following mal-function for a maintenance discharge, as well as achieving a high quality of an image. SOLUTION: Aplasma display panel is equipped with the scanning electrodes that pose in a face-to-face with an edge portion through intervening a discharge gap g, and a display electrode composed of an electrode for maintenance. A length Wx for a horizontal direction of the edge portion of the electrode for scanning that performs a write discharge, is formed larger than a length Wx of a horizontal direction of an electrode for the maintenance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface discharge type plasma display panel of a matrix display type, and more particularly to a structure of electrodes arranged on a substrate on a display surface side.

[0002]

2. Description of the Related Art FIG. 7 is an exploded perspective view showing the structure of a plasma display panel (hereinafter, referred to as a PDP) described in Japanese Patent Application Laid-Open No. 8-22772. 11 is a front substrate and 21 is a rear substrate. A partition 29 is formed on the rear substrate 21, and the fluorescent substance 2
8 are provided. Each of the discharge cells divided by the partition 29 has Xe as a gas for generating ultraviolet rays by discharge.
, And a gas such as nitrogen or oxygen. On the front substrate 11, a display electrode 41 including a scan electrode X and a sustain electrode Y opposed to each other with a discharge gap g interposed therebetween,
It is provided corresponding to a unit light emitting region corresponding to a discharge cell. The display electrode 41 is formed of a transparent electrode made of a material having a relatively high visible light transmittance, such as ITO or SnO2 (NESA). Each display electrode 41 is connected to a mother electrode (not shown). The mother electrode is formed of a low-resistance material such as silver, aluminum, copper, or a multilayer film of chromium and copper, and is provided to supply power to the display electrode 41 having a relatively high resistivity. The mother electrode is formed by a thick film process using a printing process, a thin film process using a photosensitive paste, or the like. The periphery of the display electrode 41 is covered with the dielectric layer 17, and the surface of the dielectric layer 17 has
A protective film made of a material having a relatively high secondary electron emission coefficient, such as an MgO film, and having excellent sputter resistance to ions and electrons generated by electric discharge is formed. Reference numeral 22 denotes a display electrode 41 by performing a writing discharge between the display electrode 41 and the scanning electrode X.
This is a writing electrode for forming wall charges on the substrate.

The operation of the PDP having the above configuration will be described below with reference to FIG. FIG. 8 shows a PDP during driving.
5 is a cross-sectional view in the column direction. In the figure, reference numeral 42 denotes a mother electrode for supplying power to the display electrode 41. As shown in FIG. 8A, write discharge is performed by applying a voltage higher than the discharge start voltage between the scan electrode X and the write electrode 22 corresponding to the cell to emit light. By this write discharge, wall charges are accumulated in the dielectric layer 17 on the surface of the scan electrode X. In this state, when a voltage is applied between the scan electrode X and the sustain electrode Y as shown in FIG. 8B, a surface discharge occurs via the discharge gap g. Here, the surface discharge is maintained by applying an alternating voltage between the scan electrode X and the sustain electrode Y. This discharge is called a sustain discharge, and visible light generated by the ultraviolet light generated by the sustain discharge exciting and illuminating the phosphor 28 passes through the front substrate 11 and is emitted to the outside.

[0004]

The manufacturing process of the PDP includes a high-temperature process of several hundred degrees Celsius in a sealing step for integrating the front substrate 11 and the rear substrate 21 and an exhausting step for filling a discharge gas. Is used. As a result, several micron
Distortion or shrinkage of about m to several hundred μm occurs, and the alignment accuracy of the front substrate 11 and the rear substrate 21 is reduced. Components such as the display electrode 41 and the write electrode are formed on the front substrate 11 and the rear substrate 21 by a thin film process or a thick film process, and the arrangement accuracy of these components affects the characteristics of the PDP.

FIG. 9 is an explanatory diagram for explaining a problem caused by misalignment. FIG. 9 shows the center line D of the display electrode 41 and the write electrode 22 in the manufacturing process.
7 shows a case where the positions of E and E are shifted in the row direction. In an actual PDP, cells in which such misalignment has occurred and cells in which both electrodes are arranged at ideal positions are mixed. As shown in FIG. 9, when an alignment shift occurs between the display electrode 41 and the writing electrode 22, the distance between the writing electrode 41 and the scanning electrode X increases, so that writing discharge hardly occurs. In other words, since sufficient wall charges are not formed on the scan electrode X due to the write discharge, the sustain discharge is not performed and cells that do not emit light are generated.

In order to solve the above-mentioned problems caused by misalignment, the scanning electrode X and the writing electrode 2
There is a method in which a writing discharge is easily generated even if the distance between the two is increased by increasing the voltage applied between the two. However, such a method induces dielectric breakdown on the mother electrode 42 and may cause damage to the device. The cell in which the element has been damaged is always illuminated or not illuminated irrespective of whether or not the sustain discharge occurs, thereby deteriorating the quality of the displayed image.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a PDP capable of preventing a write discharge failure due to an alignment deviation and a sustain discharge failure due to the failure, thereby obtaining high image quality. I do.

[0008]

A first plasma display panel according to the present invention comprises a first substrate, a sustain electrode having an edge parallel to a row direction, and a predetermined distance between the edge of the sustain electrode. And a second substrate disposed on a surface facing the first substrate, the scanning electrode having an edge portion which is longer in the row direction than the edge portion. Further, in the first plasma display panel described above, the scanning electrode is substantially T-shaped in a plan view. In the first plasma display panel, a phosphor is provided on a surface of the second substrate facing the first substrate, avoiding a region where the scanning electrodes and the sustain electrodes are formed. Is what you do. A second plasma display panel according to the present invention includes a first substrate and a first plasma display panel extending in a row direction.
Is maintained by an electrode pattern having a straight line portion parallel to a column direction orthogonal to the row direction and having one end connected to the mother electrode and a second end connected by a first connection portion substantially parallel to the row direction. One end is connected to the electrode and a second bus electrode extending in the row direction, and the other end is opposed to the first connection portion at a predetermined interval, and is located in the row direction more than the first connection portion. A second substrate, on which a scanning electrode formed by an electrode pattern having a linear portion parallel to the column direction and connected by a second connection portion that is longer than the first connection portion is disposed on a surface facing the first substrate. It is provided with. Further, in the above second plasma display panel, the connection portion of the scanning electrode is formed of a transparent conductive member. In the second plasma display panel, a film-like phosphor is provided on the surface of the second substrate facing the first substrate, avoiding a region where the scanning electrodes and the sustain electrodes are formed. A plasma display panel characterized by the following.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a PDP according to the present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to the same or equivalent components as those in the related art, and the description is omitted.

Embodiment 1 FIG. 1 is a plan view showing an electrode structure of the PDP according to the first embodiment. P shown in FIG.
In the DP, the scanning electrode X is formed in a substantially T shape, and the length Wx of the edge portion located on the discharge gap g side in the row direction is formed larger than the length Wy of the edge portion of the sustain electrode Y. I have. By forming the edge portion of scan electrode X longer in the row direction than sustain electrode Y in this manner, FIG.
As shown in (1), the distance between the scanning electrode X and the writing electrode 22 can be maintained at the shortest distance even when the writing electrode 22 and the display electrode 41 are displaced. As a result, it is possible to reliably perform the write discharge even when an alignment shift occurs.

Here, by increasing the length H of the edge portion of the scanning electrode X in the column direction and increasing the area of the edge portion, the facing area between the scanning electrode X and the writing electrode 22 in the case of misalignment occurs. Can be increased.
However, when the area of the edge portion of the scanning electrode X is increased,
Since the transmittance of the visible light radiated from the phosphor 28 is reduced, its size may be determined by the balance between the ease of writing discharge and the transmittance of the visible light. FIG. 2 shows a modification of the PDP according to the present embodiment. As shown in FIGS. 1 and 2, the length of the scanning electrode X in which the write discharge is performed in the row direction at the edge in contact with the discharge gap g is made larger than the edge of the sustain electrode. Can be easily changed.

Embodiment 2 FIG. In the first embodiment, the display electrode 41 is made of a transparent electrode made of ITO, SnO2, or the like. However, since such a transparent electrode has a higher resistivity than a metal, discharge is less likely to occur than an electrode made of a metal. The PDP according to the present embodiment has a display electrode 41 as shown in FIG.
Is constituted by an electrode pattern made of the same metal as the mother electrode 42. The display electrode 41 shown in the figure is constituted by a frame-shaped electrode pattern including a pair of parallel straight portions extending in the column direction and a connection portion parallel to the row direction connecting both ends thereof. The connection portion of the scan electrode X is longer than the sustain electrode Y so that the writing discharge can be reliably performed even when the alignment shift occurs. By forming the display electrode 41 with a frame-shaped electrode pattern made of the same conductive metal material as that of the mother electrode, discharge is facilitated and the transmittance of visible light emitted from the phosphor 28 is improved. Can be done. Further, the formation process of the display electrode 41 can be simplified by forming the display electrode 41 with an electrode pattern made of the same material as the mother electrode 42.

Here, FIG. 4 shows that the discharge can be performed normally even when a disconnection or the like occurs in the connection portion of the scanning electrode X.
The connection part of the scanning electrode X may be reinforced by the method shown in FIG. Further, when reinforcement is performed by an electrode pattern using a metal material as shown in FIG. 4, the transmittance of visible light is reduced in the discharge gap, so that the connection portion is made of a transparent conductive material as shown in FIG. May be reinforced.

Embodiment 3 FIG. 6 is a sectional view in the row direction showing the configuration of the PDP according to the present embodiment. As shown in the figure, the luminance can be improved by providing a phosphor 28 'on the surface of a protective film (not shown) provided on the dielectric layer 17 so as to avoid the region where the display electrode 41 is formed. The phosphor film can be applied by using a printing method or a photosensitive paste. Further, it may be formed by mixing with a protective film. Here, the thickness of the phosphor 28 ′ is desirably 10 μm or less in consideration of the transmittance of visible light emitted from the phosphor 28 formed on the inner wall of the discharge cell.

[0015]

According to the plasma display panel of the present invention, in a display electrode composed of a scan electrode and a sustain electrode opposed to each other across a discharge gap by an edge portion, the length in the row direction of the edge portion of the scan electrode performing a write discharge is provided. Is formed so as to be longer than the length of the edge portion of the sustain electrode in the row direction, thereby preventing writing discharge failure and obtaining a high-quality display image with high luminance.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a configuration of a PDP according to a first embodiment.

FIG. 2 is a plan view illustrating a configuration of a PDP according to the first embodiment.

FIG. 3 is a plan view illustrating a configuration of a PDP according to a second embodiment.

FIG. 4 is a plan view illustrating a configuration of a PDP according to a second embodiment.

FIG. 5 is a plan view illustrating a configuration of a PDP according to a second embodiment.

FIG. 6 is a sectional view illustrating a configuration of a PDP according to a third embodiment.

FIG. 7 is an exploded perspective view showing a configuration of a conventional PDP.

FIG. 8 is an explanatory diagram for explaining a light emission principle of a PDP.

FIG. 9 is an explanatory diagram for explaining a problem caused by misalignment.

[Explanation of symbols]

11 front substrate, 17 dielectric layer, 21 rear substrate, 2
2 writing electrode, 28 phosphor, 29 partition, 41
Display electrode, 42 mother electrode, X scan electrode, Y sustain electrode.

Claims (6)

[Claims] A first substrate, a sustain electrode having an edge portion parallel to the row direction, and an edge facing the edge portion of the sustain electrode at a predetermined interval, and being longer than the edge portion in the row direction. A plasma display panel, comprising: a scanning electrode having a portion; and a second substrate provided on a surface facing the first substrate. 2. The plasma display panel according to claim 1, wherein the scan electrode has a substantially T-shape in plan view. 3. The plasma display panel according to claim 1, wherein a phosphor is formed on a surface of the second substrate facing the first substrate, avoiding a region where the scan electrode and the sustain electrode are formed. A plasma display panel characterized by being provided. 4. The row direction in which one end is connected to a first substrate and a first mother electrode extending in the row direction, and the other end is connected by a first connection portion substantially parallel to the row direction. One end is connected to a sustain electrode constituted by an electrode pattern having a linear portion parallel to a column direction orthogonal to the column direction, and a second mother electrode extending in the row direction, and the other end is connected to the first connection portion. Scan electrodes configured by an electrode pattern having a straight line portion parallel to the column direction connected by a second connection portion longer in the row direction than the first connection portion, facing each other at a predetermined interval, A second substrate disposed on a surface facing the first substrate;
A plasma display panel comprising: a substrate; 5. The plasma display panel according to claim 4, wherein a connection portion of the scan electrode is formed of a transparent conductive member. 6. The plasma display panel according to claim 4, wherein a film-like structure is formed on a surface of the second substrate facing the first substrate, avoiding a region where the scanning electrode and the sustain electrode are formed. A plasma display panel comprising a phosphor.