JP2002373596A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PDP in which contact failure or disconnection of an external circuit due to peeling-off of a metal-electrode from a glass substrate is prevented and an improvement of reliability is aimed at. SOLUTION: As for this plasma display panel, three electrode groups are arranged on the glass substrate 1, and an electrode draw-out part 13 to become a junction part of these three electrode groups with the external circuit is drawn out to the end part of the glass substrate 1 outside a display region 6. A line width d3 of the most tip part of this electrode drawing part 13 is made narrower than the line width d2 of the base part of a display region side of this electrode draw-out part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a plasma display panel (PDP), and more particularly to a structure of an electrode lead-out portion of an electrode group arranged on a glass substrate.

[0002]

2. Description of the Related Art In a PDP, a display-side glass substrate on which display electrode groups are arranged and a rear-side glass substrate on which write electrode groups are arranged are arranged such that the display electrodes and the write electrodes are three-dimensionally arranged in a grid pattern. Opposingly arranged, providing a discharge space between both glass substrates, filling dischargeable gas in the discharge space in the display area, and selecting discharge cells defined at each intersection of display electrode and write electrode This is a matrix-type gas discharge display device in which electrical discharge is performed.

In a PDP having such a configuration, a display electrode group arranged on a display-side glass substrate is formed of a metallic conductive film having a high light transmittance (hereinafter, referred to as a transparent electrode) from the viewpoint of display luminance and the like. It is desirable to be done. However, since the transparent electrode has much higher resistance than a metal electrode having a low light transmittance, as the screen size increases, the display luminance difference between the center and the end in the display area in the electrode extension direction increases. As a result, the brightness uniformity in the display area deteriorates. The reason for this is that the effective voltage applied to each display cell is different between the central portion and the peripheral portion of the display because the electrode wire resistance increases in proportion to the length of the electrode and the voltage drop increases. . In addition, the same factor causes the discharge start voltage in each display cell to increase, which may cause a lighting failure.

In order to solve such a problem, in a conventional general PDP, a metal electrode having a low light transmittance but a low line resistance for supplying power is narrower than a transparent electrode, for example, on a transparent electrode. It is extended by width. As described above, the display electrode composed of the transparent electrode and the metal electrode has a certain degree of light transmittance and has a relatively low line resistance, so that the visible light emitted by the discharge is effectively used. it can. In addition, there is no difference in luminance between the central part and the peripheral part of the display area, and the in-plane luminance uniformity can be ensured.

[0005] In this case, the transparent electrode is made of ITO or SnO.
₂ (NESA), a material having relatively high visible light transmittance is used, and is often formed by a thin film process such as vapor deposition or CVD. For the metal electrodes, relatively low-resistance materials such as silver, aluminum, copper, or a multilayer film of chromium and copper are used. The formation methods include a thick film process using a printing process and a photosensitive paste. There are a variety of methods, such as a thin film process using GaN.

[0006] In the display electrode having the above structure, the transparent electrodes are arranged in the display area. On the other hand, the metal electrode is configured to extend on the transparent electrode with a smaller width than the transparent electrode as described above, and the end of the glass substrate outside the seal frit not only in the display area but also outside the display area. And plays a role as a junction with an external circuit.

FIG. 4 is an enlarged plan view of a portion of the display electrode extending to the end of the display-side glass substrate 1. In this case, a joint portion (hereinafter, referred to as an electrode lead portion) 13 of the metal electrode with an external circuit extending to the end of the glass substrate 1 is in electrical contact with an electrode extension line extended on the external drive circuit substrate. In this case, the line width d is larger than the line width of the metal electrode in the display area so that the line width d can be easily obtained.

[0008]

However, since the electrode lead portion 13 in this case is formed on the glass substrate 1, peeling is likely to occur at the interface with the glass substrate 1. As a result, in the separated electrode lead-out portion 13, conduction is not obtained in connection with an external circuit, resulting in poor contact,
Since non-lighting failure occurs on a row basis as a PDP, the PDP
The production yield may be affected. In particular, when the thickness of the metal electrode is increased in order to reduce the electrode wire resistance, peeling from the glass substrate 1 is more likely to occur.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a PDP which prevents poor contact and disconnection of an external circuit due to peeling of a metal electrode from a glass substrate, and improves reliability.

[0010]

In a first plasma display panel according to the present invention, an electrode group is arranged on a glass substrate, and an electrode lead-out portion serving as a junction between the electrode group and an external circuit is provided outside the display area. In the plasma display panel drawn to the end of the glass substrate, the line width at the foremost portion of the electrode lead portion is made smaller than the line width at the display region side base end portion of the electrode lead portion.

[0011] In a second plasma display panel according to the present invention, an electrode group is arranged on a glass substrate.
In a plasma display panel in which an electrode lead-out portion serving as a joint portion of these electrodes with an external circuit is drawn out to an end of the glass substrate outside the display area, the leading end of the electrode lead-out portion is covered with an insulating layer. ing.

In the first and second plasma display panels, the electrode group may be a display electrode arranged on a display-side glass substrate and / or a writing electrode arranged on a back-side glass substrate. There may be.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments. Note that the same or equivalent members as those in the conventional example shown in FIG.

The present invention relates to a structure of an electrode lead-out portion extending from a display region to an end of a glass substrate for connection to an external circuit in an electrode structure of a plasma display panel (PDP). , Display area 6
It is unrelated to other elements constituting the PDP, such as a dielectric layer on the display glass substrate, a protective film, etc., or a partition on the rear glass substrate, a fluorescent substance, etc., and therefore the description thereof is omitted here. I do. Therefore, the present invention can be applied to any PDP having an electrode lead portion extending from the display region to the end of the glass substrate for connection to an external circuit.

Embodiment 1 FIG. 1 is a plan view showing a schematic configuration of a plasma display panel (PDP) according to Embodiment 1 of the present invention. The PDP includes a display-side glass substrate 1 and a rear-side glass substrate 2 disposed to face the display-side glass substrate 1. On the back surface of the display-side glass substrate 1, a plurality of display electrodes 3 extending in the lateral direction of the panel (the x direction in the drawing) are arranged. A plurality of write electrodes 4 are arranged on the surface of the rear glass substrate 2 so as to extend in the vertical direction of the panel (the y direction in the drawing), that is, the direction intersecting the display electrodes 3 in a grid pattern. The two glass substrates 1,
Between them, a seal frit 5 is arranged to separate the two glass substrates at a predetermined interval and to exhaust the inside of the display area 6 and fill it with a discharge gas to form a discharge space. That is, the area of the panel surrounded by the seal frit 5 becomes the display area 6. A discharge cell is defined at each intersection of the display electrode 3 and the writing electrode 4 in the discharge space, and an image is displayed by selectively discharging the discharge cell.

Each of the display electrodes 3 is formed such that an electrode lead-out portion 13 serving as a junction with an external circuit is drawn out to an end of the display-side glass substrate 1 outside the display area 6. Each write electrode 4 also has an electrode lead-out portion 1 serving as a junction with an external circuit.
4 is drawn out to the end of the rear glass substrate 2 outside the display area 6. Note that the external circuit referred to here is a drive circuit provided on an external drive circuit board for driving a PDP.

The display electrode 3 is composed of a transparent electrode and a metal electrode extending on the transparent electrode with a width smaller than that of the transparent electrode. As in the case of the conventional example, only the metal electrode is extended in the portion, and the extended metal electrode is used as the electrode lead-out portion 13 of the display electrode 3. Also, the writing electrode 4
The entirety including the electrode lead portion 14 is made of a metal electrode.

FIG. 2 is an enlarged view of a portion A surrounded by a chain line in the electrode lead portion 13 in the display electrode group 3 of FIG. The electrode lead portion 13 of the display electrode 3 is electrically connected to an external circuit via a predetermined connection means (for example, an electrode extension line). In the present embodiment, the electrode lead portion 13 has a line width d of the metal electrode line in the display area 6 so that electrical contact with the connection means, that is, the electrode extension line can be easily obtained.
It is formed so as not to be narrower than 1. Specifically, the line width of the electrode lead portion 13 is wider than the line width d1 of the metal electrode line in the display area 6. In particular, here, the line width d3 (> d
1) is the line width d2 of the base end (the part near the display area 6).
(> D1). That is, d3 <
It is formed so as to satisfy the relationship of d2.

In the PDP configured as described above, the line width d3 of the leading end of the electrode lead portion 13 formed of the metal electrode of the display electrode 3 is smaller than the line width d2 of the base end.
When the display electrode 3 is formed on the display-side glass substrate 1, the stress acting on the electrode lead-out portion 13 during the high-temperature process, particularly the stress acting on the foremost portion, can be suppressed to a relatively small level.
Peeling generated at the interface between the electrode lead portion 13 made of a metal electrode and the display-side glass substrate 1, particularly, peeling generated at the leading edge portion is suppressed. As a result, poor contact with the electrode extension line due to the peeling of the electrode lead portion 13 is suppressed, the production yield is improved, and a highly reliable PDP can be provided.

FIG. 2 shows a case where the line width d2 of the base end of the electrode lead-out portion 13 is wider than the line width d1 of the metal electrode line in the display area 6. Even when the line width is the same over the base end of the electrode lead-out portion 13 (d1 = d2), the leading end line width d3 of the electrode lead-out portion 13 is made smaller than the base end line width d2. In this case, the relationship of d3 <d1 is satisfied, but the effect of preventing the electrode lead-out portion 13 from peeling can be obtained similarly.

In the first embodiment, the display electrodes 3
Although only the shape of the electrode lead portion 13 has been described,
Regarding the electrode lead portion 14 of the writing electrode 4, the relationship of the line width may be the same as that of the display electrode 3. As a result, an effect of preventing the writing electrode 4 from peeling off from the rear-side glass substrate 2 of the electrode lead portion 14 is obtained, and the production yield is further improved.

Embodiment 2 FIG. FIG. 3A shows a plasma display panel (PD) according to Embodiment 2 of the present invention.
3 shows a partially enlarged view of P), specifically, a portion corresponding to the portion shown in FIG. 2 in the first embodiment. FIG.
FIG. 3B is a cross-sectional view taken along the line III-III in FIG. That is, in this PDP, the leading end of the electrode lead portion 13 in the display electrode 3 is covered with the insulating layer 7 having high insulating properties. The line width of the electrode lead portion 13 is
The constant line width is wider than the line width of the metal electrode lines in the display area 6 over the entire length.

As the insulating layer 7, it is desirable to use the same material as the dielectric layer formed in the display area 6 of the PDP in order to simplify the manufacturing process. That is, by using the same material as the dielectric layer in this manner, in forming the dielectric layer in the display area 6 by screen printing in the PDP manufacturing process, the dielectric layer is formed in at least one or more printing steps. By printing the same dielectric on the foremost part of the electrode lead-out part 13 in parallel with the printing on the part, the insulating layer 7 having a thickness of several microns to several tens of microns is drawn out without increasing the number of steps. It can be formed at the foremost part of the part 13.

In FIG. 3A, the insulating layer 7 is
Although it is formed in a single band extending over the plurality of electrode lead portions 13, the present invention is not limited to this, and the insulating layer 7 may be individually formed for each electrode lead portion 13. Further, for each of the plurality of electrode lead portions 13 corresponding to each electrode extension line, the insulating layer 7 extending over these may be individually formed.

In the PDP thus configured, since the leading edge line width d3 of the electrode lead portion 13 made of the metal electrode of the display electrode 3 is covered with the insulating layer 7, the electrode lead portion made of the metal electrode is formed. Separation occurring at the interface between the substrate 13 and the display-side glass substrate 1, in particular, exfoliation occurring at the leading edge is suppressed. As a result, poor contact with the electrode extension line due to the peeling of the electrode lead portion 13 is suppressed, the production yield is improved, and a highly reliable PDP can be provided.

In the second embodiment, the display electrodes 3
Although only the case where the leading end of the electrode lead portion 13 is covered with the insulating layer 7 has been described, the leading end of the electrode lead portion 14 of the write electrode 4 may be covered with the insulating layer in the same manner. As a result, an effect of preventing the writing electrode 4 from peeling off from the rear-side glass substrate 2 of the electrode lead portion 14 is obtained, and the production yield is further improved.

[0027]

According to the plasma display panel of the first aspect of the present invention, an electrode group is arranged on a glass substrate.
An electrode lead-out portion serving as a joint portion of the electrode group with an external circuit is drawn out to an end of the glass substrate outside the display area, and the line width of the foremost part of the electrode lead-out portion is set to Since the width of the electrode lead portion is narrower than the line width of the base end portion on the display region side, peeling of the electrode lead portion from the glass substrate can be suppressed, and a highly reliable plasma display panel can be provided.

According to a second aspect of the present invention, there is provided the plasma display panel according to the first aspect, wherein the electrode group is arranged on the glass substrate, and an electrode lead-out portion serving as a junction between the electrodes and an external circuit is outside the display region. In the plasma display panel which is drawn out to the end, since the leading end of the electrode lead-out portion is covered with an insulating layer, peeling of the electrode lead-out portion from the glass substrate can be suppressed, and a highly reliable plasma A display panel can be provided.

Further, in the plasma display panel according to claim 3 of the present invention, the electrode group includes a display electrode arranged on a display-side glass substrate, and / or
Since the write electrodes are arranged on the rear glass substrate, it is possible to suppress peeling of the display electrode and / or the write electrode from the electrode lead portion on the display side and / or the rear glass substrate, and to achieve a highly reliable plasma. A display panel can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic configuration of a plasma display panel according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged plan view of an electrode lead portion of a display electrode in FIG.

FIGS. 3A and 3B are an enlarged plan view and a sectional view of an electrode lead portion of a display electrode in a plasma display panel according to a second embodiment of the present invention. FIGS.

FIG. 4 is a partially enlarged plan view of a conventional plasma display panel.

[Explanation of symbols]

1 display side glass substrate, 2 back side glass substrate, 3 display electrode, 4 writing electrode, 6 display area, 7 insulating layer,
13 electrode lead-out part of display electrode, 14 electrode lead-out part of writing electrode, d2 base end line width, d3 leading end line width.

Claims (3)

[Claims] 1. A plasma display panel in which electrode groups are arranged on a glass substrate, and an electrode lead-out portion serving as a junction between the electrode group and an external circuit is drawn to an end of the glass substrate outside a display area. 3. The plasma display panel according to claim 1, wherein a line width of a leading end of the electrode lead portion is smaller than a line width of a base end portion of the electrode lead portion on a display region side. 2. A plasma display panel according to claim 1, wherein an electrode group is arranged on a glass substrate, and an electrode lead-out portion serving as a junction between the electrode and an external circuit is drawn out to an end of the glass substrate outside a display area. A plasma display panel, wherein a leading end of the electrode lead-out portion is covered with an insulating layer. 3. The plasma according to claim 1, wherein the electrode group is a display electrode arranged on a display-side glass substrate and / or a write electrode arranged on a rear-side glass substrate. Display panel.