JPS6237356Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a novel structure of an EL light emitting device.
Specifically, by improving the lead wires for applying AC voltage to the electroluminescence emitting layer (hereinafter referred to as "EL emitting layer"), especially the lead wires connected to the transparent electrode side, the number of manufacturing steps and materials can be reduced. The present invention aims to provide a novel EL light-emitting element that has effects such as cost reduction based on the reduction in lead wire extraction part and reduction in restrictions on shape design based on improved sealing of the lead wire extraction part.

BACKGROUND ART AND PROBLEMS THEREFOR FIG. 1 schematically shows the structure of an organic dispersion type EL light emitting device a. This EL light emitting element has a back electrode b made of a conductive metal foil such as aluminum foil or a conductive plastic sheet.
A white dielectric layer c is formed by dispersing a high dielectric substance such as barium titanate or titanium oxide in a thermoplastic cyanoethyl cellulose-based high dielectric resin material, and a phosphor powder is also dispersed in a cyanoethyl cellulose-based high dielectric resin material. EL luminescent layer d, which is formed by dispersing indium oxide, and a transparent conductive film formed by vapor-depositing a conductive substance such as indium oxide on a transparent film, or a layer of transparent conductive paint, which is formed by dispersing indium oxide powder in a transparent resin. (transparent electrode)
e are stacked one after another, and finally this laminate is sealed with moisture-proof and protective transparent films f and g. Then, when an AC voltage is applied between the lead terminals taken out from the transparent electrode e and the back electrode b, the phosphor powder of the EL light emitting layer d is excited and emits light.

By the way, in the EL light emitting element a having the structure shown in Fig. 1, the transparent electrode e has a high surface resistance, and the voltage drop due to this resistance may cause uneven light emission. A conductive material such as silver paste is printed along the side edge of the electrode e to provide a current collection band h having a width of 1 to 2 mm, and a lead wire i is connected to this current collection band h. On the other hand, in such an EL light emitting element a, the thickness of each layer practically required in the laminate is 80 μm for the back electrode, 20 to 30 μm for the dielectric layer, and 20 to 30 μm for the light emitting layer.
30 μm, current collecting band 15 μm, transparent electrode 80 μm (for transparent conductive film. 5 for transparent conductive paint layer)
~15 μm). And each of these layers b, c,
The laminate consisting of d and e is sealed with moisture-proof and protective films f and g (of course, the lead wires i and j are drawn out) to complete the process.

The lead wires i and j are selected from the viewpoints of cost, mechanical strength, adhesion to the moisture-proof film, etc.
A mesh lead wire (#150 to #300) made of fine wires made of bronze, copper, etc. is used. The thickness of this mesh lead wire is 80 to 180 μm.
Therefore, if this is directly stacked on top of the transparent electrode e, it will look like the one shown in Figure 3.Furthermore, in the hot pressing process when sealing this with moisture-proof films f and g, this mesh lead wire i will be stacked on top of the transparent electrode e. As shown in Fig. 4, the transparent electrode e, the EL light emitting layer d, the dielectric layer c, etc. are crushed, and the insulation in this area is reduced. This can cause a fatal short circuit.

Therefore, in order to prevent the situation shown in FIG. 4 from occurring, measures as shown in FIG. 5 have conventionally been taken. That is, an insulating tape l is pasted on the end face of the laminate and the side edge of the transparent electrode e, and a soft metal foil, for example, an aluminum foil m with a thickness of about 10 to 15 μm is placed on top of the insulating tape l. Overlapping, and
Both ends of the aluminum foil were placed over the transparent electrode e and the moisture-proof film g, and the tip of the mesh lead wire i was placed over the end of the aluminum foil m that covered the moisture-proof film g.

However, in the conventional lead wire drawing method as shown in Fig. 5, the aluminum foil m is 10 to 15 μm.
Because it is a small piece with a thickness of It is difficult to automate the work and causes an increase in costs.Furthermore, since there is an overlapping part W between the aluminum foil m and the mesh lead wire i, it is difficult to seal with the moisture-proof films f and g. It is necessary to take a large width,
There are drawbacks such as restrictions on the shape design of the EL light emitting element.

Purpose of the invention Therefore, in view of the problems with the above-mentioned conventional lead wire extraction method for EL light emitting elements, the present invention was developed by:
By improving the lead wires, especially the lead wires connected to the transparent electrode side, we can reduce costs by reducing the number of manufacturing steps and materials, and reduce restrictions on shape design by improving the sealing of the lead wire extraction part. The purpose of the present invention is to provide a novel EL light emitting device that is effective.

Summary of the invention In order to achieve the above object, the EL light-emitting device of the invention has a laminate consisting of an electroluminescent layer and a dielectric layer sandwiched between a transparent electrode and a back electrode, and is sealed with a moisture-proof film. , the lead wires connected to the transparent electrode and the back electrode are drawn out from the side edges of the moisture-proof film, and the connecting ends of the mesh lead wires are made into a foil shape by crushing the connecting ends of the mesh lead wires, which are formed by knitting conductive wires into a mesh shape on the lead wires. The foil-like connection end is connected to a transparent electrode and a back electrode.

EXAMPLES The details of the EL light emitting device of the present invention will be described below with reference to illustrated examples.

In the figure, 1 is an example of implementation of the EL light emitting device of the present invention.

Reference numeral 2 denotes a back electrode made of a conductive metal foil such as aluminum foil or a conductive plastic sheet. 3 is a white dielectric layer formed by dispersing a high dielectric material such as barium titanate or titanium oxide in a thermoplastic cyanoethyl cellulose-based high dielectric resin material, and is stacked on the back electrode 2.

4 was formed by dispersing phosphor powder in the same cyanoethyl cellulose-based high dielectric resin material.
This is an EL light emitting layer, and is laminated on the dielectric layer 3. Reference numeral 5 denotes a transparent electrode formed by depositing a conductive material such as indium oxide on a transparent film, and a current collecting band 6 is formed on the side edge of the transparent electrode.
This current collecting band 6 is formed by printing a conductive material such as silver paste. Then, such a transparent electrode 5
is laminated on the EL light emitting layer 4.

The transparent electrode 2, dielectric layer 3, EL as described above
A laminate 7 consisting of a light emitting layer 4, a transparent electrode 5 and a current collecting band 6 is sealed with transparent films 8 and 9 for moisture proofing and protection.

Incidentally, the lead wire 10 is connected to the transparent electrode 5 in the following manner.
connected to.

Reference numeral 11 denotes a double-sided adhesive insulating tape, which is attached to the end face of the laminate 7 and the edge of the transparent electrode 5. The lead wire 10 is made of bronze or copper, etc., knitted into a mesh shape (about #150 to #300) and has a thickness of about 80 to 180 μm. The connection portion at the tip of the mesh lead wire 10 is pressed at a pressure of about 600 to 1000 kg/cm ² to form a foil with a thickness of about 40 to 80 μm, and the foil connection end 12 is formed here. (See Figures 7A-C). The foil-like connecting end 12 of the mesh lead wire 10 is placed on the double-sided adhesive tape 11 so that it protrudes from the double-sided adhesive insulating tape 11 wrapped around the edge of the transparent electrode 5 onto the transparent electrode 5 and is overlapped on the current collecting band 6. Place it along the Note that the foil-shaped connection end 14 of the lead wire 13 on the side of the back electrode 2 is overlapped with the edge of the back electrode 2.

The laminate 7 on which the lead wires 10 and 13 are disposed as described above is hermetically sealed with the moisture-proof films 8 and 9 to form the EL light emitting element 1.

Next, a practical method for manufacturing the mesh lead wire 10 (or 13) will be explained with reference to FIG.

15 is a mesh material made into a sheet;
It is made of knitted bronze or copper, and its edges are pressed to form the foil-like part 16. A double-sided adhesive tape material 17 is pasted onto the base end of the foil-like portion 16 of this mesh material 15 (see FIG. 8B). Then, by cutting this into a predetermined width as shown by the cutting line 18 in FIG. 8C, the mesh lead wire 10 (or 13) to which the double-sided adhesive tape 11 is attached is formed. Then, the mesh lead wire 10 formed in this way is attached to the double-sided adhesive tape 11.
By arranging the mesh lead wire 10 so that it touches a predetermined end face of the laminate 7, the mesh lead wire 10 is temporarily attached to the laminate 7 at a predetermined position, making subsequent work easier. .

Effects of the Invention As is clear from the above description, the EL light emitting device of the present invention has a laminate consisting of an electroluminescent layer and a dielectric layer sandwiched between a transparent electrode and a back electrode, and a moisture-proof film. Seal it with
The lead wire connected to each of the transparent electrode and the back electrode is drawn out from the side edge of a moisture-proof film, and the connecting end of the mesh lead wire is made into a foil shape by crushing the connecting end of the mesh lead wire, which is formed by knitting conductive wires into a mesh shape on the lead wire. and the foil-like connection end is connected to the transparent electrode and the back electrode.
This has the effect of reducing costs due to the reduction in manufacturing man-hours and the number of materials, and reducing restrictions on shape design due to improved sealing of the lead wire extraction portion.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional schematic diagram of the general structure of an EL light emitting element, Figure 2 is a front view of the EL element, and Figure 3 is a cross-sectional view of the general structure of an EL light emitting element.
The figure is a sectional view showing the state of a conventional EL light emitting element before sealing the lead wire extraction part, Figure 4 is a sectional view of the lead wire extraction part after sealing, and Figure 5 is a sectional view of the conventional EL light emitting element.
6 is a sectional view showing an example of another implementation of the EL light emitting device, FIG. 7 is a sectional view showing an example of the implementation of the EL light emitting device of the present invention, and FIG.
FIG. 8 is a diagram sequentially showing the manufacturing process of the mesh lead wire from A to C. Explanation of symbols, 1... EL light emitting element, 2... Back electrode, 3... Dielectric layer, 4... Electroluminescence light emitting layer, 5... Transparent electrode, 10... Lead wire, 12... Foil shape connection end.

Claims (1)

[Scope of utility model registration request] A laminate consisting of an electroluminescent layer and a dielectric layer sandwiched between a transparent electrode and a back electrode is sealed with a moisture-proof film, and the lead wires connected to the transparent electrode and the back electrode are placed on the side of the moisture-proof film. The connecting end of a mesh lead wire, which is drawn out from the edge and formed into a mesh of conductive wires on the lead wire, is crushed into a foil shape, and the foil-like connecting end is connected to the transparent electrode and the back electrode. An EL light emitting element characterized by: