JPH0547306A - Display panel - Google Patents

Abstract

PURPOSE:To provide a display panel enabling a lead-out terminal for an electrode formed in one of insulation substrates to be collectively provided on the other thereof by disposing a sealing agent at the outer end portions of the mentioned one insulation substrate surface opposing the other mentioned insulation substrate surface even if the remaining surplus space can not be secured on the mentioned opposing surface of the mentioned one insulation substrate. CONSTITUTION:A front face substrate 4 formed with a transparent electrode 12, and a rear face substrate 6 formed with an electrode 24, are disposed in a manner that the respective electrode-formation surfaces thereof are opposed thereto with a specified gap therebetween, and the electrode formation surfaces of the both substrates are hermetically sealed via a sealing agent 36, to thereby form a space portion 38 between the substrates. In this gas discharge display panel 2, an electrode lead-out end portion 18 integrally formed with the transparent electrode 12 is adhered to a side face 16 of the front face substrate 4 while, at the same time, a terminal portion 30 is formed at an end edge portion 28 of the rear face substrate 6. A conductive adhesive agent 40 is disposed between the electrode lead-out end portion 18 and the terminal portion 30, thereby electrically connecting both together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel in which a pair of insulating substrates each having an electrode formed on one surface thereof are opposed to each other at a predetermined interval, and more particularly to an electrode formed on one insulating substrate. The present invention relates to a display panel in which takeout terminals are integrated on the other insulating substrate.

[0002]

2. Description of the Related Art In a display panel such as a gas discharge display panel having a structure in which a pair of insulating substrates each having electrodes formed thereon are opposed to each other at a predetermined interval, each insulating substrate is arranged in a fixed direction. The electrodes were taken out from each other and shifted to overlap with each other, and an electrode lead-out terminal was formed at an edge (non-overlapping portion) formed at one end of each insulating substrate. For this reason, in order to connect to the drive circuit, it is necessary to route the lead wires from both sides of the panel. Especially, when the panel size is large or the panel is long and thin, the lead wires are a hindrance. However, since there are two parts to be taken out from the panel, there is a problem in that the work process becomes complicated.

As a solution to this problem, there has been proposed a display panel in which the extraction terminals of both insulating substrates are integrated on one insulating substrate. That is, in JP-A-53-118365, as shown in FIG. 6, after sealing an upper glass substrate a and a lower glass substrate b with a sealing material c, the outside of the sealing portion of the upper glass substrate a Electrode lead-out end portion d led to
And a terminal conductor e formed in advance outside the sealing portion of the lower glass substrate b, and a connecting piece f formed of an alloy of Cu-Be.
There is disclosed a gas discharge panel g connected by. Further, in the publication, instead of the connecting piece f, as shown in FIG. 7, a conductive adhesive h such as silver paste is used.
Also discloses a gas discharge panel i for connecting the electrode lead-out end portion d and the terminal conductor e.

[0004]

In the gas discharge panels g and i described above, the terminal portion e which is a take-out terminal of the upper glass substrate a is formed on the lower glass substrate b,
Since the terminal portion e is connected to the electrode lead-out end portion d via the connecting piece f or the conductive adhesive h, the electrode of the upper glass substrate a can be taken out on the lower glass substrate b. Therefore, it is not necessary to run the lead wire for a long time,
Since the lead process is performed only at one place on the lower glass substrate b, the working process can be simplified.

However, since both the connecting piece f and the conductive adhesive h are arranged outside the sealing material c on the opposing surface sides of the upper glass substrate a and the lower glass substrate b, the gas discharge panel. In the case where the sealing material c is arranged at the outer end of the upper glass substrate a on the opposite surface side in order to increase the display area of g and i, a space for arranging the connection piece f and the conductive adhesive h is provided in the upper glass substrate. The above conventional example cannot be applied because it cannot be secured on the facing surface side of a. Conversely, to apply the above conventional example, the upper glass substrate a
Means that a space for arranging the connecting piece f and the like must be provided outside the sealing material c on the opposite surface side, and there is a dissatisfaction in that it is a limit to the expansion of the display area. It was a thing.

The present invention has been made in view of the above-mentioned problems of the conventional example, and since the sealing material is arranged at the outer end portion of one insulating substrate on the opposite surface side, the sealing material remains on the opposite surface of the insulating substrate. It is an object of the present invention to provide a display panel in which the lead-out terminals for electrodes formed on the insulating substrate can be integrated on the other insulating substrate even when the space cannot be secured.

[0007]

In order to achieve the above-mentioned object, a display panel according to the present invention has a first insulating substrate having a first electrode formed on one surface and a second electrode provided on one surface. By disposing the formed second insulating substrate so that the electrode forming surfaces face each other at a predetermined interval, and sealing the peripheral edges of the electrode forming surfaces of both substrates with a sealing material, In a display panel in which a space is formed between substrates, an electrode lead-out end electrically connected to the first electrode is formed on a side surface of the first insulating substrate other than an electrode formation surface, and the second insulating substrate is formed. A terminal portion corresponding to the electrode lead-out end portion is formed at the edge portion of the insulating substrate, and a conductive adhesive is arranged between the electrode lead-out end portion and the terminal portion to electrically connect the two. Configured as
The conductive adhesive is composed of silver paste, solder or the like.

It is desirable to dispose a core member inside the conductive adhesive. As the core member, a glass bead, a glass rod, a metal ball, or a metal plate having a first contact piece that contacts the electrode lead-out end portion and a second contact piece that contacts the terminal portion is used.

[0009]

Thus, the first electrode formed on the one surface of the first insulating substrate is connected to the edge portion of the second insulating substrate via the electrode lead-out end portion and the conductive adhesive. Since it is electrically connected to the formed terminal portion, the first electrode can be taken out at the edge portion of the second insulating substrate.

Since the electrode lead-out end portion is formed on a side surface other than the electrode formation surface of the first insulating substrate, the sealing material is formed on the first side surface of the first insulating substrate.
Since it is arranged at the outer end of the electrode forming surface of the insulating substrate, it can be applied to the case where a residual space cannot be secured outside the sealing material.

By disposing the core member inside the conductive adhesive material, the conductive adhesive material spreads evenly along the surface of the core member, so that the electrode lead-out end portion and the terminal portion. The contact area with is increased. As a result, the contact resistance between the electrode lead-out end portion and the terminal portion is reduced, and the connection between the both becomes more reliable. Further, it is possible to prevent the conductive adhesive from having a void or a crack.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments. FIG. 1 is a partial cross-sectional view of an AC type gas discharge display panel 2 according to this embodiment.
The front substrate 4 and the rear substrate 6 are arranged to face each other with a predetermined gap.

In the front substrate 4, a transparent electrode 12 made of tin oxide or the like is adhered and formed on a lower surface 10 of a translucent insulating substrate 8 made of glass or the like, and the surface of the transparent electrode 12 is lead oxide. It is formed by covering with a first dielectric layer 14 made of a transparent dielectric material such as glass. An electrode lead-out end portion 18 integrally formed with the transparent electrode 12 is attached to the right side surface 16 of the translucent insulating substrate 8.

The rear substrate 6 has an electrode 24 made of a conductor such as silver palladium deposited on the upper surface 22 of an insulating substrate 20 such as glass or ceramic.
Is covered with a second dielectric layer 26 made of lead oxide glass or the like. Further, on the upper surface 22 of the insulating substrate 20,
A terminal portion 30 made of a conductor such as silver palladium is adhered to a portion that does not overlap the front substrate 4 (hereinafter referred to as "edge portion 28").

Although not shown, a protective film made of a sputter-resistant material such as magnesium oxide is formed on the surface of the first dielectric layer 14 and the surface of the second dielectric layer 26. There is. Similarly, although not shown in the figure, the space between the translucent insulating substrate 8 and the first dielectric layer 14 and the insulating substrate
A mask layer for partitioning the display region is formed at an appropriate position between the 20 and the second dielectric layer 26. The mask layer is composed of a light-shielding member such as black glass.

The front substrate 4 and the rear substrate 6 having the above structure
Is disposed so that the first dielectric layer 14 and the second dielectric layer 26 face each other with a predetermined gap, for example, a gap of 100 μm to 200 μm. Then, the lower surface outer end portion 32 of the front substrate 4 and the upper surface outer end portion 34 of the rear substrate 6 are hermetically sealed by a sealing material 36 made of a low melting point glass such as frit glass. As a result, a space 38 for gas discharge is formed between the front substrate 4 and the rear substrate 6.
The space 38 is filled with a discharge gas such as neon after vacuum processing.

A conductive adhesive 40 made of silver paste or the like is disposed between the electrode lead-out end 18 and the terminal portion 30 to electrically connect the electrode lead-out end 18 and the terminal portion 30. is doing.

Due to the above-mentioned configuration, the transparent electrode 12 formed on the front substrate 4 is connected to the edge portion 28 of the rear substrate 6 via the electrode lead-out end portion 18, the conductive adhesive 40 and the terminal portion 30. Taken out. Although not shown, the rear substrate 6 is not shown.
Terminals for taking out the electrodes 24 arranged on the rear substrate 6 are also formed on the edge portion 28 of the. In this way, the rear substrate 6
Transparent electrode formed on the front substrate 4 at the edge 28 of the
It is possible to take out the electrode 12 formed on the back substrate 6 and the back substrate 6.

Next, a method of manufacturing the gas discharge display panel 2 in this embodiment will be described with reference to FIGS. First, an electrode 24 is provided on the upper surface 22 of the insulating substrate 20 in a shape corresponding to a display pattern, the surface of the electrode 24 is covered with a second dielectric layer 26, and the edge portion of the insulating substrate 20 is covered. The terminal portion 30 is adhered to 28 to form the back substrate 6. Then, the sealing material 36 is applied to the upper surface outer end portion 34 of the rear substrate 6 by thick film printing.

In parallel with the above steps, the transparent electrode 12 is provided on the lower surface 10 of the transparent insulating substrate 8 in a shape corresponding to the display pattern, and the surface of the transparent electrode 12 is covered with the first dielectric. The right side surface 16 of the translucent insulating substrate 8 is covered with the body layer 14.
The front substrate 4 is formed by depositing the electrode lead-out end portion 18 which is an extension of the transparent electrode 12 on. And
The sealing material 36 is also applied to the outer surface 32 of the lower surface of the front substrate 4 by thick film printing.

The front substrate 4 and the rear substrate 6 are contacted with the sealing material 36 applied to the upper surface outer end portion 34 of the rear substrate 6 and the sealing material 36 applied to the lower surface outer end portion 32 of the front substrate 4. After positioning so as to be in contact with each other, the conductive adhesive 40 is applied between the electrode lead-out end 18 and the terminal portion 30 (FIG. 3) and heated for a predetermined time. Through this heat treatment, the sealing material 36 is melted and softened to hermetically seal the lower surface outer end portion 32 of the front substrate 4 and the upper surface outer end portion 34 of the rear substrate, and at the same time, the conductive adhesive 40 Is sintered and the electrode lead-out end portion 18 and the terminal portion 30 are electrically connected (FIG. 1). The heat treatment is performed at 450 ° C. for about 1 hour, for example.

Next, another embodiment according to the present invention will be described with reference to FIG. The present embodiment is characterized in that the spherical glass beads 42 serving as the core member are arranged in the central portion of the conductive adhesive 40 in the above embodiment, and other configurations are the same as in the above embodiment.

By arranging the glass beads 42, the conductive adhesive 40 spreads evenly along the surface of the glass beads 42, so that the contact area with the electrode lead-out end portion 18 and the terminal portion 30 increases. As a result, the electrode lead-out end portion 18 and the terminal portion 30
The contact resistance between them can be reduced, and the two are more reliably connected by the conductive adhesive 40. Also, conductive adhesive
It is also possible to prevent the formation of cavities or cracks in 40.

The glass beads 42 may be embedded after the conductive adhesive 40 is applied.
Alternatively, the glass beads 42 may be kneaded in and applied in a state of containing the glass beads 42.

Instead of the glass beads 42, as shown in FIG. 5, a metal plate 44 having a substantially L-shaped cross section may be used as a core member of the conductive adhesive 40. That is, the metal plate 44,
The first contact piece 46 has the electrode lead-out end portion formed on the side surface 16.
18 and the second contact piece 48 is arranged so as to contact the terminal portion 30 formed on the edge portion 28, respectively, and the conductive adhesive 40 is applied in a film form on the periphery thereof. As a result, the electrode lead-out end portion 18 and the terminal portion 30 are more reliably electrically connected via the metal plate 44. Further, the metal plate 44 is firmly fixed by the conductive adhesive 40.

The material of the metal plate 44 is not particularly limited, and may be made of any metal as long as it is a good electrical conductor. Further, as the conductive adhesive 40, a silver paste may be used as in the above embodiment, but solder may be used instead of the silver paste. In that case, it is desirable that the metal plate 44 be made of a material such as phosphor bronze that is compatible with solder.

In each of the above embodiments, the AC type gas discharge display panel 2 has been described as an example. However, the present invention is a DC type gas discharge display panel, liquid crystal panel or the like, and a pair of insulating members each having electrodes formed thereon. The present invention can be widely applied to a display panel having a structure in which substrates are opposed to each other with a predetermined interval and the peripheral edges are hermetically sealed.

[0028]

In the display panel according to the present invention, since the electrode lead-out end portion is formed on the side surface other than the electrode formation surface of the first insulating substrate having the first electrode formed on one surface, the sealing is achieved. Even when the remaining space cannot be secured on the electrode formation surface because the adhesive material is formed on the outer end portion of the electrode formation surface of the first insulating substrate, the electrode lead-out end portion, the conductive adhesive material, and the terminal portion are used. The first electrode can be taken out at the edge of the second insulating substrate. As a result, the lead processing for connecting to the external drive circuit can be performed at one edge portion of the second insulating substrate, which simplifies the configuration and facilitates the manufacturing, and the reliability of the display panel. Is improved.

Further, by disposing the core member inside the conductive adhesive material, the conductive adhesive material spreads evenly along the surface of the core member, so that the electrode lead-out end portion and the terminal portion. The contact area with is increased. As a result, the contact resistance between the electrode lead-out end and the terminal can be reduced, and the connection between the two can be made more reliable. In addition, it is possible to prevent cavities and cracks from occurring in the conductive adhesive.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing one embodiment of a display panel according to the present invention.

FIG. 2 is a partial cross-sectional view showing the manufacturing method of the above embodiment.

FIG. 3 is a partial cross-sectional view showing the manufacturing method of the above embodiment.

FIG. 4 is a partial cross-sectional view showing another embodiment of the display panel according to the present invention.

FIG. 5 is a partial cross-sectional view showing another embodiment of the display panel according to the present invention.

FIG. 6 is a partial cross-sectional view showing a conventional example.

FIG. 7 is a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

 2 Gas Discharge Display Panel 4 Front Substrate 6 Rear Substrate 12 Transparent Electrode 16 Right Side 18 Electrode Lead Edge 24 Electrode 28 Edge Edge 30 Terminal 36 Sealing Material 38 Space 40 Conductive Adhesive 42 Glass Beads 44 Metal Plate 46 First contact piece 48 Second contact piece

Claims (4)

[Claims] 1. A first insulating substrate having a first electrode formed on one surface thereof and a second insulating substrate having a second electrode formed on one surface thereof are separated from each other by a predetermined distance. In a display panel in which a space portion is formed between the two substrates by hermetically sealing the peripheral edges of the electrode formation surfaces of both substrates with a sealing material. An electrode lead-out end electrically connected to the first electrode is formed on a side surface other than the formation surface, and a terminal portion corresponding to the electrode lead-out end is formed at the edge of the second insulating substrate. A display panel is characterized in that a conductive adhesive is arranged between the electrode lead-out end and the terminal to electrically connect the two. 2. The display panel according to claim 1, wherein the conductive adhesive is made of solder. 3. The display panel according to claim 1, wherein a core member is arranged inside the conductive adhesive material. 4. The core member is formed of a metal plate having a first contact piece that comes into contact with the electrode lead-out end portion and a second contact piece that comes into contact with the terminal portion. The display panel according to claim 3.