WO2007125747A1

WO2007125747A1 - Plasma display panel

Info

Publication number: WO2007125747A1
Application number: PCT/JP2007/057864
Authority: WO
Inventors: Hiroto Yanagawa
Original assignee: Panasonic Corporation
Priority date: 2006-04-28
Filing date: 2007-04-10
Publication date: 2007-11-08

Abstract

Provided is a plasma display panel (100) including a first substrate (10) having a plurality of display electrode pairs, a second substrate (20) adhered to the first substrate (10) by a sealing member (30) and having a plurality of data electrodes (22), which extend to intersect with the display electrode pairs through clearances, a panel region enclosed by a sealing member (30) and having a plurality of discharge cells using the individual clearances between the display electrode pairs and the data electrodes (22) as the individual discharge spaces, and terminal electrodes (22a) making junctions to an external terminal outside of the regionenclosed by the sealing member (30) and conducting with the data electrodes (22). A dielectric layer (23) covering the data electrodes (22) extends from the panel region to at least the sealing member (30), and steps (S1) formed by the conductions between the data electrodes (22) and the terminal electrodes (22a) are covered with the sealing member (30).

Description

Specification

Plasma display panel

Technical field

The present invention relates to a plasma display panel (hereinafter abbreviated as “PDP”), and more particularly to a technique for preventing ion migration of an electrode for a PDP terminal joined to an external terminal.

Background art

[0002] A PDP is a gas discharge panel that displays an image by exciting phosphors with ultraviolet rays generated by gas discharge. PDP can be categorized into AC type (AC type) and DC type (DC type) according to its discharge formation method. Among them, AC type is more than DC type in terms of brightness, luminous efficiency and life. It is excellent and has become the mainstream of the current PDP.

[0003] Such AC-type PDP electrode materials are roughly classified into transparent electrodes and metal electrodes. Indium stannate (ITO) or tin oxide (SnO) is used for the transparent electrode.

In addition, silver (Ag), aluminum (A1) or CrZCuZCr three-layer systems are used for the metal electrodes.

[0004] Of the metal electrodes exemplified above, an Ag-based electrode is usually formed by forming an Ag metal particle into a resistive paste-like fluid containing glass frit and applying an appropriate coating method, for example, a screen printing method. Has been. Such an Ag-based electrode is advantageous as a PDP electrode because it has an advantage that the resistance value of silver is low and can be formed with high efficiency by a screen printing method.

[0005] On the other hand, the Ag-based electrode has the disadvantage of being easily ion-migrated (see Non-Patent Document 1), and in particular, it is a flexible printed circuit film (hereinafter abbreviated as "FPC"). The terminal joint of the Ag-based electrode for connection with the terminal is easily exposed to the outside air (moisture).

[0006] For this reason, various countermeasures for preventing Ag miridation when a voltage is applied between terminals of an Ag-based electrode in the presence of moisture have been studied.

[0007] For example, a method has been proposed in which the terminal part of an Ag-based electrode is coated with silicon resin to prevent water from entering the terminal part, thereby preventing the occurrence of Ag migration. (See Patent Document 1 as a conventional example).

[0008] In addition, the Ag-based electrode is divided into an Ag electrode part (wiring part) and a gold (Au) electrode part (terminal part) excellent in migration resistance, and the Ag electrode part is formed on the front and rear substrates of the PDP. Some PDPs are configured to eliminate the occurrence of Ag migration by limiting the part exposed to the outside (outside air) of the sealing material to the Au electrode part by positioning it inside the sealing material for bonding. (See Patent Document 2 as a conventional example). In this case, the connection portion between the Ag electrode portion and the Au electrode portion is placed under the PDP dielectric layer.

Patent Document 1: Japanese Patent Laid-Open No. 216502 (FIG. 3)

Patent Document 2: Japanese Patent Laid-Open No. 2001-357788

Non-Patent Document 1: Toshiyuki Oshima, “Ion migration as a cause of insulation degradation of printed circuit boards”, Circuit Packaging Society, vol.10 no.2, 1995

Disclosure of the invention

Problems to be solved by the invention

[0009] However, the technology for preventing Ag migration of the terminal portion of the PDP electrode described in the conventional example has the following problems.

[0010] First, problems of Ag migration prevention technology (technology similar to the Ag migration prevention technology described in Patent Document 1) based on application of silicon resin to the terminal joint portion of the Ag-based electrode will be described.

FIG. 7 is a cross-sectional view showing a peripheral structure of a terminal portion of an Ag-based electrode covered with a conventional PDP silicon resin.

FIG. 8 is a cross-sectional view of a portion along the line AA in FIG. 7, and FIG. 9 is a cross-sectional view of a portion along the line BB in FIG.

However, FIG. 7 of the present specification is within a range that does not hinder the examination of the Ag migration prevention technology based on the application of silicon resin to the terminal joint portion of the Ag-based electrode described in Patent Document 1. For the convenience of explanation, the configuration shown in FIG. 3 described in Patent Document 1 is modified.

For example, FIG. 3 of Patent Document 1 illustrates a form in which a part of the terminal portion of the Ag-based electrode of the rear glass substrate is exposed, but FIG. 7 of this specification shows an Ag-based electrode. The entire terminal area of The form covered with reconn resin is assumed.

[0015] In Patent Document 1, the Ag-based electrode is not limited to the PDP data electrode, the PDP scan electrode, and the sustain electrode, but as described later, the PDP data electrode is connected to the scan electrode and the sustain electrode. Since it is estimated that Ag migration is easier and in the environment, the data electrode will be described as an example here.

A conventional PDP 200 shown in FIG. 7 includes a front plate 210 and a back plate 220.

[0017] The front plate 210 and the back plate 220 are overlapped so that their main surfaces (hereinafter referred to as "inner surfaces") face each other, and are annular sealing provided at the peripheral portions of the front plate 210 and the back plate 220. Bonded with material 230 (paste containing glass frit). The distance between front panel 210 and rear panel 220 is kept constant by a partition (not shown) inside PDP 200.

[0018] In addition, the back plate 220 has an extending portion 220a that extends further outward from the front plate 210 from the sealing material 230 and functions as a terminal region. The Ag-based data electrode 222 of the back plate 220 crosses the sealing material 230 from the inside of the PDP 200 (an area inside the sealing material 230; not shown), and passes through the extending portion 220a of the back plate 220. It extends to the vicinity of one end face of the back plate 220.

Near this end face, the data electrode 222 is joined to the terminal 243 of the wiring of the FPC 240 via an anisotropic conductive film 241 (hereinafter abbreviated as “AC F241”).

Furthermore, a silicon resin 244 is provided so as to cover the data electrode 222 of the extension 220 a of the back plate 220 and the terminal 243 of the wiring of the FPC 240.

[0021] Here, the material properties of silicon resin 244 employed as a sealing material for preventing Ag migration are the data electrode 222 (adhered object) in which silver metal particles are dispersed in a glass component, and the gas properties. Due to the material characteristics of the back plate 220 (adhered article) composed mainly of lath, the initial adhesion between the silicone resin 244 and the adherend is inferior. There is concern.

[0022] Then, for example, when these members are heated, due to the difference in thermal expansion coefficient between the silicon resin 244 and the adherend, the silicon resin 244 as shown in FIG. It is predicted that minute voids 250 will be generated due to peeling. [0023] The PDP 200 including the void 250 may cause moisture to exist in the void 250 depending on the use environment (for example, a high humidity environment). If this happens, applying the voltage between the adjacent data electrodes 222 (electric field formation) may cause the conditions for the occurrence of Ag migration to be met.

Here, since the sealing material 230 is a material containing glass as a main component, the matching of material characteristics with the data electrode 222 in which silver metal particles are dispersed in a glass component is improved. As a result, the adhesion between the sealing material 230 and the data electrode 222 as shown in FIG. 9 is appropriately ensured. Similarly, since the dielectric layer (not shown) and the back plate 220 are both composed mainly of glass, the adhesion between the sealing material 230 and the back plate 220 is shown in FIG. It is secured appropriately as shown. Further, even if an dielectric layer is interposed between the sealing material 230 and the data electrode 222, and between the sealing material 230 and the dielectric layer, between the dielectric layer and the data electrode 222, and Adhesion between the dielectric layer and the back plate 220 is also ensured appropriately.

[0025] On the other hand, the Ag migration prevention technology (Ag migration prevention technology described in Patent Document 2) in which the Ag-based electrode is divided into an Ag electrode portion and an Au electrode portion having excellent migration resistance includes an Ag electrode. There are the following inconveniences caused by placing the connection part between the part and the Au electrode part under the dielectric layer.

[0026] The thickness of the PDP electrode described in Patent Document 2 (In Patent Document 2, Ag-based electrodes should be limited to both data electrodes, scan electrodes, and sustain electrodes) is usually about 5 μm (for example, a screen). In this case, the resistance of the PDP electrode is reduced.

[0027] Here, following the technique described in Patent Document 2, it is necessary to overlap the Ag electrode part and the Au electrode part (terminal electrode) in order to properly conduct the connection. The overlap between the electrode part and the Au electrode part is actually 10 m thick with a 5 m step.

[0028] Despite this, if such a superimposed portion is covered with a thin dielectric layer having a thickness of about several tens / zm (for example, about 10 m), the force of the dielectric layer at the step of the superimposed portion Due to poor leverage, the step in the overlapping area causes cracks in the thin dielectric layer. However, there is a possibility that such a step is exposed to the outside of the dielectric layer.

[0029] To deal with such inconveniences, measures such as increasing the thickness of the dielectric layer can be considered. To do so, the thickness of the dielectric layer is an important design spec that affects the current limiting function of the PDP. For this reason, it is necessary to redesign the PDP discharge element. Therefore, this cannot be a useful solution.

[0030] It should be noted that the entire terminal electrode as in Patent Document 2 itself is made of Au metal, which is not practical considering the cost of Au metal.

[0031] By the way, according to the future trend of PDP, the voltage applied to the data electrode (data voltage) for the purpose of increasing the luminous efficiency of PDP is a reflective effect that will increase the xenon (Xe) gas partial pressure ratio in the future. It is predicted that the voltage will increase. For example, if the Xe gas partial pressure ratio shifts from the existing 5% to more than 10%, the PDP cannot emit light well unless the data voltage is set high (for example, the data voltage is shifted from about 67V to about 75V).

[0032] Further, when aiming to further increase the definition of the PDP and to increase the screen size, such a data voltage may be similarly increased from the viewpoint of appropriately securing the voltage margin of the PDP. For example, in order to select a discharge cell to be discharged in the sustain period, if a higher voltage can be applied to the data electrode in the address period prior to the sustain period, a margin for the voltage applied to the scan voltage can be secured. Is preferred.

[0033] In addition, the data electrode pitch (cell pitch) is narrow from the viewpoint of achieving high definition of the PDP (for example, the data electrode pitch is shifted from 240 m in the existing high-vision specification to 150 μm or less). It is estimated that.

[0034] In short, the electric field strength between adjacent data electrodes may greatly increase due to the synergistic effect of both the high data voltage and the narrow pitch between the data electrodes. Ag migration prevention needs to be dealt with more carefully.

[0035] Note that the scan electrode and the sustain electrode have a wide inter-electrode pitch, and it is difficult for a high potential difference to occur between adjacent electrodes over a long period of time. The possibility of close-up is less than the problem of Ag migration.

[0036] In anticipation of the technical trends peculiar to the data electrode in the PDP as described above, the Ag migration prevention technologies described in the conventional examples can be summarized as follows. Ag migration prevention technology for Ag-based electrodes based on protection, at least for the data electrode, is likely to get stuck sooner or later due to insufficient adhesion between the silicone resin and the adherend.

[0037] Further, the bonding technique between the Ag electrode portion and the Au electrode portion described in Patent Document 2 incorporates inconveniences such as generation of cracks in the thin dielectric layer, and has a viewpoint of appropriate terminal bonding formation. This is a half-finished technology.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a plasma display panel that can appropriately prevent misregistration of a terminal portion of a data electrode.

Means for solving the problem

[0039] In order to solve the above problems, a plasma display panel according to the present invention includes a first substrate having a plurality of display electrode pairs, and a plurality of data electrodes bonded to the first substrate by an annular sealing material. And the display electrode pair and the data electrode extend so as to intersect each other with a gap, and a plurality of gaps between the display electrode pair and the data electrode are used as respective discharge spaces. A panel region surrounded by the sealing material and an external terminal outside the region surrounded by the sealing material, and is electrically connected to the data electrode. And a dielectric layer covering the data electrode reaches at least the panel region force and the sealing material, and a step generated between the data electrode and the terminal electrode is caused by the step. It is a panel covered with a stopper

[0040] As described above, since the step due to conduction between the data electrode and the terminal electrode is covered with a sufficiently thick sealing material (for example, 100 μm or more), the sealing material does not have poor coverage at the step. Therefore, it is possible to appropriately avoid the exposure of the difficult step to the outside of the sealing material.

[0041] Further, since the entire area force of the data electrode including the glass frit is covered with an insulator layer or a sealing material having a low melting point glass force, the adhesion between the two can be kept in a good state. Thus, migration of the data electrode can be prevented appropriately.

[0042] The dielectric layer may be interposed between the sealing material and the step.

[0043] Thereby, the entire area of the data electrode is covered with the dielectric layer, and the step is covered with both the sealing material and the dielectric layer. Here, as a first configuration example of the terminal electrode, the terminal electrode is an electrode that overlaps with the data electrode and extends outside the region separately from the data electrode.

[0045] In this case, the data electrode may be made of silver, and the terminal electrode may be made of a metal selected from copper, aluminum, nickel, or a silver alloy.

If the data electrode is made of silver, for example, Ag metal particles are made into a resistance paste-like fluid containing glass frit (hereinafter referred to as “silver paste”), and an appropriate coating method (for example, a screen). The printing method can be formed to an appropriate thickness, and the resistance value can be reduced. A data electrode using such a silver paste has an advantage that the resistance value of silver is low, and is suitable for forming an electrode while ensuring high productivity by a screen printing method.

[0047] In addition, metals with a medium strength of copper, aluminum, and nickel, and silver alloys are highly reliable materials with superior migration resistance compared to silver, which makes terminal electrode migration appropriate. Can be prevented.

[0048] In particular, it is known to appropriately suppress the occurrence of migration by alloying silver such as an Ag-Pd (palladium) alloy. The terminal electrode using such an Ag-Pd alloy easily inherits the existing technology that has been cultivated so far by forming a data electrode by screen printing using a silver paste, and appropriately uses a screen printing method. It is estimated that it can be efficiently formed in the thickness of the metal, and is promising as a future migration-resistant electrode material.

[0049] In addition, as a second configuration example of the terminal electrode, the core electrode is formed so that the terminal electrode overlaps with the data electrode and the core material portion extending outside the region. A covered electrode that covers the surface of the portion.

[0050] In this case, the data electrode and the core member may be made of silver, and the covered electrode may be made of a metal selected from among copper, aluminum, nickel, or a silver alloy. .

[0051] If the data electrode and the core member are made of silver, for example, Ag metal particles are made into a resistance paste-like fluid containing glass frit, and an appropriate thickness is obtained by an appropriate application method (for example, a screen printing method). The resistance value can be reduced. The data electrode and the core member using such a silver paste have the advantage that the resistance value of silver is low, and the script The electrode can be formed while ensuring high productivity by the tone printing method.

[0052] Metals that have been selected to have a medium strength of copper, aluminum, and nickel, and silver alloys are highly reliable materials that have superior migration resistance compared to silver. Can be prevented.

[0053] In particular, it is known that the occurrence of migration is appropriately suppressed by alloying silver such as an Ag-Pd (palladium) alloy. The coated electrode using such an Ag-Pd alloy easily inherits the existing technology that has been cultivated so far and forms the data electrode by screen printing using silver paste. It is estimated that it can be efficiently formed in the thickness of the metal, and is promising as a future migration-resistant electrode material.

In addition, a separate terminal electrode (in the case of the first configuration example) or a covered electrode (in the case of the second configuration example) that conducts with the data electrode or the like having the configuration described above is provided, and the material is migrated. Appropriate selection of the prevention and cost increase viewpoint power is to increase the xenon partial pressure and increase the data voltage to improve the brightness of the PDP, or to ensure the PDP voltage margin appropriately, or This is particularly useful when attempting to increase the definition of PDPs by narrowing the pitch of the data electrodes.

[0054] The above object, other objects, features, and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings.

The invention's effect

The present invention has the above-described configuration, and has an effect that the migration of the terminal portion of the data electrode can be appropriately prevented in the plasma display panel.

Brief Description of Drawings

FIG. 1 is a perspective view showing a configuration example of the PDP and its peripheral members according to the first embodiment.

[FIG. 2] FIG. 2 is a perspective view of a portion corresponding to several pixels in the panel area of the PDP shown in FIG.

FIG. 3 is a view showing a cross section along the data electrode and the terminal electrode around the sealing material shown in FIG. 1. FIG. 4 is a view showing a cross section along the data electrode and the terminal electrode around the sealing material in the PDP of the modification of the first embodiment.

FIG. 5 is a view showing a cross section along the data electrode and the terminal electrode in the peripheral portion of the sealing material at the peripheral portion of the PDP according to the second embodiment.

FIG. 6 is a view showing a cross section along the data electrode and the terminal electrode around the sealing material in the PDP of the modification of the second embodiment.

[FIG. 7] FIG. 7 is a cross-sectional view showing a peripheral structure of a terminal portion of an Ag-based electrode covered with silicon resin in a conventional PDP.

[FIG. 8] FIG. 8 is a cross-sectional view of a portion along line AA in FIG.

[FIG. 9] FIG. 9 is a cross-sectional view of the portion along line BB in FIG.

Explanation of symbols

10 Front plate

11 Front glass substrate

12 Display electrode pair

12a scan electrode

12b sustain electrode

13, 23 Dielectric layer

14 Protective film

20 Back plate

20a Extension

21 Rear glass substrate

22 Data electrode

22a, 160 terminal electrode

24 Bulkhead

25 Phosphor layer

25R red phosphor layer

25G green phosphor layer

25B Blue phosphor layer 30, 130 Encapsulant

40 FPC

41a Back plate side ACF

41b Circuit board side ACF

50 circuit board

51 Driver IC

100 PDP

160a Core part

160b coated electrode

201 Panel area

202 terminal area

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)

FIG. 1 is a perspective view showing a configuration example of the PDP and its peripheral members according to the present embodiment.

[0059] The PDP 100 of the present embodiment includes a front plate 10 and a back plate 20 disposed so as to face each other, as shown in FIG. Twenty peripheral edges and force Thickness (height) are joined by a rectangular sealing material 30 extending in a rectangular shape of 100 m or more.

[0060] FIG. 1 shows an extended portion 20a of the back plate 20 extending outward from the sealing material 30, and this extended portion 20a is electrically connected to each of a number of data electrodes 22 (see FIG. 2). Thus, a large number of terminal electrodes 22a drawn from the sealing material 30 are provided. A part or all of the extended portion 20a functions as a terminal region 202 described later.

However, in an actual PDP, the extended portion of the substrate extending outward from the sealing material 30 is not limited to the extended portion 20a of the back plate 20 of FIG. There is an extension for (see Figure 2). Here, from the viewpoint of simplifying the illustration, the extension portion of the front plate 10 is not shown. [0062] FIG. 1 illustrates a single-scan PDP 100. If a double-scan PDP 100 is used, the same force as the extension shown in FIG. Exists.

[0063] In the PDP 100 as described above, a panel region 201 having a plurality of discharge cells (see FIG. 1 and FIG. 2) and a terminal electrode 22a and an external terminal of the FPC are joined. There is a terminal area 202 (see Fig. 3).

[0064] Hereinafter, a detailed configuration of panel region 201 of PDP 100 and a detailed configuration of terminal region 202 will be described in order.

First, a configuration example of the panel region 201 of the PDP 100 will be described with reference to FIGS. 1 and 2.

[0066] FIG. 2 is a perspective view in which a portion corresponding to several pixels in the panel region of the PDP shown in FIG. 1 is cut out.

The front plate 10 includes a rectangular front glass substrate 11 as shown in FIG. 2, a display electrode pair 12, a transparent dielectric layer 13, and a transparent protective layer 14.

The front glass substrate 11 is a member that serves as a base of the front plate 10, and the front glass substrate 1

A plurality of display electrode pairs 12 extending in parallel with each other are formed on the inner surface of 1.

[0069] One of the display electrode pair 12 is a scan electrode 12a, and the other is a sustain electrode 12b.

[0070] The scan electrode 12a (panel electrode) is a narrow bus electrode (indicated by a dotted line in FIG. 2) at the edge along the longitudinal direction of a strip-shaped transparent electrode (eg, indium tin oxide electrode; ITO electrode). Are formed to overlap each other, extend to one side surface of the front glass substrate 11, and are joined to a circuit substrate (not shown) for the scan electrode 12a via an FPC (not shown) in the vicinity of the side surface.

[0071] Similarly, the sustain electrode 12b (panel electrode) is configured in such a manner that a narrow bus electrode (shown by a dotted line in FIG. 2) is superimposed on an edge along the longitudinal direction of the strip-shaped transparent electrode, The glass substrate 11 extends to the other side surface of the glass substrate 11 and is joined to a circuit substrate (not shown) for the sustain electrode 12b via an FPC (not shown) in the vicinity of the side surface.

[0072] The bus electrode is a highly conductive metal film such as an Ag-based film, an A1-based film, or Cr. / Cu / Cr3 layer-based material is used as a main component, and serves to lower the overall resistance value of each of the scan electrode 12a and the sustain electrode 12b.

[0073] The inner surfaces of the display electrode pair 12 and the front glass substrate 11 are low-melting glass (thickness of about several tens of thousands) mainly composed of lead oxide (PbO), bismuth oxide (BiO), or phosphorus oxide (PO). / zm)

2 3 4

This is covered with a dielectric layer 13, thereby providing a current limiting function peculiar to the AC type PDP and realizing a longer life than the DC type PDP.

[0074] Furthermore, on the surface of the dielectric layer 13, in order to reduce the discharge start voltage, the secondary electron emission coefficient γ is large, so that the sputtering layer is protected so as to protect the dielectric layer 34 from the discharge ion bombardment. A protective layer 14 with a thickness of approximately 1.0 / zm is provided, which is mainly composed of a metal oxide material that is highly transparent and has excellent transparency and insulation resistance, such as an acid magnesium (MgO) material. Has been

[0075] The back plate 20 is a dielectric layer formed so as to cover the rectangular back glass substrate 21, the data electrode 22, the data electrode 22, and the back glass substrate 21 as shown in FIG. 23, barrier ribs 24 formed on the dielectric layer 23 at a predetermined interval, and phosphor layers 25 (25R, 25G, 25B) formed on the wall surfaces of the gaps between the adjacent barrier ribs 24.

The back glass substrate 21 is a member that serves as a base for the back plate 20. On the inner surface of the back glass substrate 21, the back electrode substrate 12 intersects the display electrode pair 12 (to be exact, orthogonal) and extends in parallel with each other. A plurality of strip-shaped data electrodes 22 are formed.

[0077] The data electrode 22 in the present embodiment is made of an appropriate film formed by an appropriate coating method (for example, screen printing method) using Ag metal particles as a resistance paste-like fluid (silver paste) containing glass frit. It can be formed to a thickness (for example, 5 m), and the resistance value is reduced. The data electrode 22 using such a silver paste has an advantage that the resistance value of silver is low, and it is preferable that the electrode can be formed while ensuring high productivity by a screen printing method.

It should be noted that the data electrode 22 as such a panel electrode is electrically connected (conducted) with the terminal electrode 22a (see FIG. 1) in the terminal region 202 as described in detail later.

It should be noted that the dielectric layer 23 having a thickness of about several tens / zm also has a lead-based or non-lead-based low melting point glass force, like the dielectric layer 13 of the front plate 10.

[0080] The partition wall 24 extending in parallel with the data electrode 22 and forming a groove-like space is, for example, a mark. Manufactured by a screen printing method or a sandblasting method using a paste for printing ribs.

[0081] In the above-described sandblasting method, a paste of a lead-based or non-lead-based low-melting glass material is applied in a solid form so as to reach a predetermined thickness over a plurality of times, and after an appropriate drying process. This is called the sand blasting method, and the laminated coating layer is drilled and finely processed by spraying a blasting material (a kind of gun particle).

In addition, the phosphor layer 25 is prepared by dispersing a phosphor material corresponding to any one of red, green, and blue in an organic binder and pasting it, for example, to coat the wall surface of the partition wall 24. It is formed by a series of phosphor forming processes in which it is applied by a screen printing method so that it is covered, and this coating layer is dried and baked.

[0083] In the present embodiment, examples of materials of the red, green, and blue phosphor layers 25R, 25G, and 25B are a red phosphor material (YO: Eu) and a green phosphor material (Zn SiO), respectively. : M

2 3 2 4 n) and blue phosphor material (BaMgAl 2 O: Eu) force used Especially limited to this

10 17

It is not what is done.

[0084] The front plate 10 and the back plate 20 are overlapped so that the inner surfaces thereof face each other as shown in FIG. In this case, the front plate 10 and the back plate 20 are bonded to the front glass substrate 11 and the back plate in a state where the front plate 10 and the back plate 20 are bonded together by a sealing material 30 (a paste containing glass frit) provided on the peripheral edge thereof. The distance from the glass substrate 21 is regulated by the partition wall 24 and kept constant.

[0085] A gap between each of the red phosphor layer 25R, the green phosphor layer 25G, and the blue phosphor layer 25B and the protective layer 14 forms a discharge space. The discharge space is sealed at a pressure of about 7 to 801 ^ ½ (200 to 6001 ^ r) of a discharge gas (filled gas) composed of rare gas components such as He, Xe, Ne, and Ar.

[0086] Further, an area intersecting with one display electrode pair 12 and one data electrode 22 across the power discharge space and an area in the vicinity thereof contribute to image display, and one of red, blue and green One discharge cell that can display any color is used, and one pixel of the PDP100 is a discharge cell composed of one red discharge cell, one blue discharge cell, and one green discharge cell. It is configured as a collection of

Thus, in the present embodiment, the annular sealing material 30 extending in such a rectangle is surrounded. A portion having the discharge cells sandwiched between the front plate 10 and the back plate 20 within the region formed constitutes a panel region 201.

Next, a configuration example of the terminal region 202 of the PDP 100 will be described with reference to FIG. 1, FIG. 2, and FIG.

FIG. 3 is a view showing a cross section along the data electrode and the terminal electrode around the sealing material shown in FIG. However, in FIG. 3, illustration of the FPC 40 and the back plate side ACF 41a of FIG. 1 is omitted. Further, from the viewpoint of simplifying the explanation here, the front plate 10 in FIG. 3 is abbreviated to be configured only by the front glass substrate 11, and the back plate 20 in FIG. Except for the body layer 23, it is abbreviated as a configuration composed only of the rear glass substrate 21.

[0090] The data electrode 22 shown in FIG. 2 extends on the rear glass substrate 21 toward the end face thereof, and has a thickness of 100 m or more due to the internal force of the non-region 201 as shown in FIG. It extends to just below the center of the 30 width direction. Then, immediately below the substantially central portion, one end of the data electrode 22 having a thickness of about 5 μm and the one end of the terminal electrode 22a having a thickness of about 5 μm are electrically connected to overlap each other over a predetermined width. For this reason, the step S1 in the conductive portion (overlapping portion) between the data electrode 22 and the terminal electrode 22a is covered with the sealing material 30.

That is, such a terminal electrode 22a is electrically connected (superimposed) to the data electrode 22, is formed separately from the data electrode 22, extends to the outside of the panel region 201, and has a junction with the external terminal. It becomes an electrode that exhibits the function of the terminal region 202 formed.

On the other hand, the dielectric layer 23 covering the data electrode 22 extends from the panel region 201 of the PDP 100 to the sealing material 30 with the data electrode 22, and further between the sealing material 30 and the data electrode 22. And between the sealing material 30 and the terminal electrode 22a. That is, the dielectric layer 23 is interposed and sealed between the sealing material 30 and the step S1 so as to cover the step S1 in the conductive portion (overlapping portion) between the data electrode 22 and the terminal electrode 22a. It intersects with the stopper 30 and extends to the extending portion 20 a of the back plate 20.

Thus, in the present embodiment, it is outside the region surrounded by the sealing material 30 and is positioned between the end of the dielectric layer 23 and the other end of the terminal electrode 22a. The band-shaped portion constitutes a terminal region 202 that forms a junction between the terminal electrode 22a and the external terminal. [0094] Each of such terminal electrodes 22a is connected to a terminal (external terminal) of the FPC 40 wiring group via the back plate side ACF 41a in the terminal region 202 near the end surface of the back plate 20 as shown in FIG. ). The wiring group of the FPC 40 is bonded to the driver IC 51 of the circuit board 50 via the circuit board side ACF 41b.

That is, the back plate side and the circuit board side ACF 41a, 41b are formed in a film by dispersing conductive particles in an adhesive binder, and the ACF 41a, 41b is attached to the adherend (back) of the panel end. On the face plate side ACF41a, when it is sandwiched between the electrodes (terminals) of the back plate 20 and the FPC 40), the binder flows and the conductive particles are pressed directly onto the terminal surface, so that the electrode of the adherend Conduction between is obtained.

As a result, conduction between the data electrode 22 and the driver IC 51 is obtained, and the control device (not shown) can control the driver IC 51 so as to supply an appropriate drive signal to the data electrode 22.

[0097] Note that the image 1TV field (one frame) of the PDP 100 according to the present embodiment is time-divided into a plurality of subfields, whereby the control device controls the number of discharges for each subfield to display grayscales. The voltage application timing of the data electrode 22 and the display electrode pair 12 is controlled as possible.

[0098] For example, a PDP100 image 1TV field period, an initializing period in which wall charges necessary for the subsequent address period are formed on the wall of the discharge cell, and a discharge cell that is discharged in the subsequent sustain period! Is divided into 8 sub-field periods having a discharge period selected in the address period and a sustain period for discharging the selected discharge cells, the ratio of the light emission time lengths of the 8 sub-fields is 1: 2: 4: 8: 19: 32: 64: 128 to the power of 2, and in each discharge cell, all subfields are in a “0 (zero)” state with no light emission (ie, all subfields 256-level gray scale display ranging from “without writing period selection in the field” to “255” with light emission in all subfields (ie, with writing period selection in all subfields). Become feasible . Such a control operation of the PDP 100 is publicly known, and a more detailed description is omitted here.

[0099] The terminal electrode 22a is made of a highly reliable metal superior in migration resistance compared to silver, for example, a metal having a medium force selected from copper (Cu), aluminum (A1), and nickel (Ni). It is made.

[0100] It is also known to appropriately suppress the occurrence of Ag migration by using a silver alloy, for example, an Ag-Pd (palladium) alloy (silver palladium alloy). The terminal electrode 22a using such an Ag—Pd alloy easily inherits the existing technology that has been cultivated until now when the data electrode 22 is formed by screen printing using silver paste. It is estimated that it can be efficiently formed to an appropriate film thickness (for example, 5 m) by the screen printing method, and is considered promising as a future migration-resistant electrode material.

[0101] Of course, the terminal electrode 22a may be formed using a vacuum deposition process using a deposition material made of metal powder or the like, or a plating process.

According to the PDP 100 of the present embodiment as described above, the front plate 10 having a plurality of pairs of scan electrodes 12a and sustain electrodes 12b, and the back plate 20 having a plurality of data electrodes 22 are provided. In the PDP 100 bonded by the sealing material 30, the pair of the scan electrode 12a and the sustain electrode 12b and the data electrode 22 extend so as to be orthogonal with a gap, and the pair of the scan electrode 12a and the sustain electrode 12b and the data A panel region 201 surrounded by the sealing material 30 having a plurality of discharge cells each having a respective gap with the electrode 22 as a discharge space, and an external terminal outside the region of the sealing material 30 A dielectric layer covering the data electrode 22 from the panel region 201 of the PDP 100 to at least the encapsulant 30, and the terminal electrode 22 a conducting to the data electrode 22. Data electrode 22 and Step S 1 that occurs in order to obtain continuity between the child electrode 20a is intended to be covered by the sealing member 30 of the thick film than at least a dielectric layer 23.

[0103] As described above, the step S1 at the conductive portion between the data electrode 22 and the terminal electrode 22a is covered with the sufficiently thick sealing material 30 (100 m or more). Level difference S1 sealant 30 It is possible to avoid exposure to the outside appropriately.

[0104] Further, since the entire area force of the Ag-based data electrode 22 containing glass frit is covered with the dielectric layer 23 which also has a low melting point glass force, the adhesion between the two can be maintained in a good state. As a result, Ag migration of the data electrode 22 can be prevented appropriately.

[0105] Furthermore, the terminal electrode 22a is a material excellent in migration resistance and suitable for cost. Migration of the terminal electrode 22a can be appropriately prevented due to the power of being made of a metal such as Cu, Al, Ni, or an Ag—Pd alloy.

[0106] Thus, providing a separate terminal electrode that conducts with the Ag-based data electrode, and appropriately selecting the material from the viewpoint of preventing migration and suppressing the cost increase, the xenon partial pressure is increased, This is especially useful when increasing the data voltage to improve the brightness of the PDP, to ensure an adequate PDP voltage margin, or to increase the PDP precision by narrowing the data electrode pitch. is there.

[0107] (Modification)

In the present embodiment, an example has been described in which the dielectric layer 23 extends to the extending portion 20a while intersecting the sealing material 30, but it is not always necessary that the dielectric layer 23 reaches the extending portion 20a. is not . When the dielectric layer 23a as in the modification shown in FIG. 4 reaches an appropriate position in the width direction of the sealing material 30, the effect of preventing Ag migration of the present technology is exhibited.

In short, if the Ag-based data electrode 22 containing glass frit is covered with at least one of the dielectric layer 23a made of low-melting glass and the sealing material 30 containing glass frit, the data Ag migration of the electrode 22 can be prevented appropriately.

[0109] Thus, in this modification, outside the region surrounded by the sealing material 30, more specifically, between the end in the width direction of the sealing material 30 and the other end of the terminal electrode 22a. The band-shaped portion positioned constitutes a terminal region 302 that forms a junction between the terminal electrode 22a and the external terminal.

[0110] (Embodiment 2)

FIG. 5 is a view showing a cross section along the data electrode and the terminal electrode in the peripheral portion of the sealing material at the peripheral portion of the PDP according to the present embodiment.

[0111] The configuration of PDP 110 below the periphery of sealing material 130 is the same as the configuration of PDP 100 described in the first embodiment, and therefore description and illustration of the configuration common to both is omitted. In FIG. 5, the same reference numerals are given to the same components as those in FIG. 3, and the description of such components is omitted.

[0112] The terminal electrode 160 has a laminated (two-layered) electrode structure as shown in FIG. 5, and more specifically, a core material portion 160a continuously extending from the data electrode 122, and a core material portion. And a covering electrode 160b covering the entire surface thereof so as to overlap with 160a. [0113] Note that such a terminal electrode 160 is an electrode that extends to the outside of the panel region 201 and exhibits the function of the terminal region 402 and forms a joint with the external terminal.

[0114] Here, the core material portion 160a of the terminal electrode 160 is made of the same material (Ag-based electrode) formed at the same time as the data electrode 122. As a result, the core material portion 160a It extends continuously with the data electrode 122. In other words, the portion that is simultaneously formed in the same shape as the data electrode 122 and is covered with the covering electrode 160b is referred to as the core portion 160a of the terminal electrode 160 for convenience in this specification.

It should be noted that the outer shape of both electrodes integrated in this way extends from the panel region 201 to the sealing material 130 on the back glass substrate 21 to the extended portion 20a of the back plate 20. As described above, the back glass substrate 21 extends toward the end surface with force.

[0116] The coated electrode 160b of the terminal electrode 160 extends from the end of the core member 160a toward the panel region 201 of the PDP 110, and the width of the sealing material 130 having a thickness of 100 m or more as shown in FIG. It reaches to just below the center of the direction. For this reason, the step S2 in the conductive portion between the terminal electrode 160 (covered electrode 160b) and the data electrode 122 is covered with the sealing material 130.

[0117] The coated electrode 160b is also made of a highly reliable metal having excellent migration resistance compared to silver, such as Cu, Al, and Ni, similar to the material of the terminal electrode 22a described in the first embodiment. It is made of a selected metal or a silver alloy such as an Ag—Pd alloy.

On the other hand, the dielectric layer 123 covering the data electrode 122 extends from the panel region 201 of the PDP 110 to the seal material 130 with the data electrode 122, and further, the seal material 130 and the data electrode 122. And between the sealing material 130 and the covered electrode 160b.

That is, the dielectric layer 123 is interposed and sealed between the sealing material 130 and the step S2 so as to cover the step S2 in the conductive portion between the terminal electrode 160 and the data electrode 122. It intersects with the material 130 and extends to the extending portion 20a of the back plate 20.

[0120] Thus, in the present embodiment, outside the region surrounded by the sealing material 130, the end of the dielectric layer 123 and the end of the core portion 160a (more precisely, the end) A belt-like portion located between the terminal electrode 160 and the external terminals constitutes a terminal region 402.

[0121] According to the PDP 110 of the present embodiment configured as described above, the terminal electrode 160 force data The dielectric layer 123 covering the data electrode 122 includes a core member 160a continuously extending from the data electrode 122 and a covering electrode 160b covering the surface so as to overlap the core member 160a. From the panel region 201 of the PDP 110 to the encapsulant 130 together with the data electrode 122, the step S2 in the conductive portion between the data electrode 122 and the terminal electrode 160 is at least thicker than the dielectric layer 123. It is covered with the sealing material 130.

[0122] As described above, the step S2 at the conductive portion between the data electrode 122 and the terminal electrode 160 is covered with the sufficiently thick sealing material 130 (100 m or more), so that the sealing material 1 30 is formed at the step S2. It is possible to appropriately avoid exposure of 130 to the outside of such a step S2, which is difficult to cause poor coverage.

[0123] Further, since the entire area of the Ag-based data electrode 122 containing glass frit is covered with the dielectric layer 123 made of low-melting glass, the adhesion between the two can be maintained in a good state. Thereby, Ag migration of the data electrode 122 can also be prevented appropriately.

[0124] Furthermore, the entire area force of the Ag-based core member 160a is covered with the covered electrode 160b, whereby the Ag migration of the core member 160a can be appropriately prevented.

[0125] In addition, the coated electrode 160b is made of a material excellent in migration resistance and suitable for cost, for example, a metal selected from Cu, Al, Ni, or an Ag-Pd alloy. Therefore, the migration of the covered electrode 160b can also be prevented appropriately. However, if the coated electrode 160b is formed into a thin film (for example, about 1 μm) by vacuum deposition or the like, the cost of the PDP can be suppressed even if Au metal is used.

[0126] Thus, providing a separate coated electrode that conducts with the Ag-based data electrode, and appropriately selecting the material from the viewpoint of preventing migration and suppressing cost increase, increases the partial pressure of xenon, This is especially useful when increasing the data voltage to improve the brightness of the PDP, when ensuring a suitable voltage margin for the PDP, or when increasing the precision of the PDP by narrowing the data electrode pitch. .

[0127] (Modification)

In the present embodiment, the example in which the dielectric layer 123 extends to the extending portion 20a crossing the sealing material 130 has been described. However, it is not always necessary that the dielectric layer 123 reaches the extending portion 20a. It is not a matter. The dielectric layer 123a as in the modification shown in FIG. If it reaches, it will have the effect of preventing Ag migration of this technology.

In short, if the Ag-based data electrode 122 containing glass frit is covered with either the dielectric layer 123a made of low-melting glass or the sealing material 130 containing glass frit, the data electrode 122 Ag migration can be prevented appropriately.

Thus, in this modification, outside the region surrounded by the sealing material 130, more specifically, the end of the sealing material 130 and the end of the core material portion 160a (more precisely, the covered electrode covering the end) A band-like portion located between the terminal electrode 160 and the external terminals constitutes a terminal region 502 that forms a junction between the terminal electrode 160 and the external terminals.

From the above description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. Details of the structure and Z or function thereof can be substantially changed without departing from the spirit of the invention.

Industrial applicability

[0130] The plasma display panel of the present invention can be used for a display device using a thin panel as an application of a television device for transportation, public facilities, or homes, for example.

Claims

The scope of the claims

[1] a first substrate having a plurality of display electrode pairs;

A second substrate bonded to the first substrate by an annular sealing material and having a plurality of data electrodes;

The display electrode pair and the data electrode have a plurality of discharge cells extending so as to intersect each other with a gap, and each gap between the display electrode pair and the data electrode is a discharge space. A panel region surrounded by the sealing material,

A terminal electrode connected to an external terminal outside the region surrounded by the sealing material, and conducting to the data electrode;

With

A dielectric layer covering the data electrode extends from the panel region cover to at least the sealing material, and a step resulting from conduction between the data electrode and the terminal electrode is covered with the sealing material. Plasma display panel.

[2] The plasma display panel according to claim 1, wherein the dielectric layer is interposed between the sealing material and the step.

3. The plasma display panel according to claim 1, wherein the terminal electrode overlaps with the data electrode and extends outside the region separately from the data electrode.

[4] The terminal electrode includes: a core part extending out of the region integrally with the data electrode; and a covering electrode covering a surface of the core part so as to overlap the core part. The plasma display panel according to 1 or 2.

5. The plasma display panel according to claim 3, wherein the data electrode is made of silver, and the terminal electrode is made of any metal selected from copper, aluminum, and nickel, or a silver alloy.

[6] The data electrode and the core member are made of silver, and the coated electrode is made of a metal selected from copper, aluminum, nickel, or a silver alloy.

4. The plasma display panel according to 4.

7. The plasma display panel according to claim 5 or 6, wherein the silver alloy is a silver palladium alloy.