JPS62122092A - EL element and its manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an EL element and a method for manufacturing the same.

[Conventional technology]

As shown in FIGS. 10 and 11, for example, a conventional EL element is constructed by laminating a back electrode 1, an insulating layer 2, a light emitting layer 3, and a transparent electrode film 4. The entire EL element is covered with a moisture-proof film 5. At the same time, lead terminals 6 and 7 made of metal such as copper in the form of a mesh or a lead frame are connected to the back electrode 1 and the transparent 1-grip film 4, respectively, and horizontally outward from the sealed portion of the moisture-proof film 5. It was designed to be taken out. Further, a current collecting layer 8 formed on the transparent electrode film 4 and made of, for example, silver was included in the light emitting layer 3.

[Problem that the invention seeks to solve]

However, in the conventional EL element described above, the lead terminal 6
．． Copper foil and phosphor bronze foil are often used as the material for the lead frame 7, but these both have a problem in that they are expensive, and the cost of the lead frame that has been subjected to processing such as punching or etching becomes even higher. Further, copper mesh terminals have a high flexibility but lack sufficient strength, and copper lead frame terminals have a problem of poor flexibility although they can maintain strength. Also, EL emitting color lead terminal 6.7
In this case, the ends of the lead terminals 6 and 7 must be inserted under the back electrode 1 and the transparent electrode film 4, respectively, which causes a problem in that assembly is troublesome. In addition, since the current collecting layer 8 is formed on the light emitting part, the spike voltage that occurs when the EL element is driven to blink (ON-OFF) often causes discharge and destroys the element, resulting in poor reliability. There was a problem.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an EL element that is low in cost, has sufficient lead terminal strength and flexibility, is easy to manufacture, and has high reliability, and a method for manufacturing the same.

[Means and effects for solving the problems] The EL element according to the present invention includes a back electrode with an extraction lead and a current collecting layer contact electrode with an extraction lead arranged on the same substrate, and a current collecting layer contact electrode with an extraction lead arranged on the same substrate. an insulating layer and a light-emitting layer laminated in sequence, a current-collecting layer laminated on the current-collecting layer contact electrode, and a transparent electrode laminated thereon so as to cover both the light-emitting layer and the current-collecting layer. and a moisture-proof film that seals the entire member. Therefore, since both the lead-out leads of the back electrode and the current collecting layer contact electrode are located on the same surface, these leads can be used as terminals as they are, and they can be used as they are with EL light-emitting color lead terminals as in the past. The connection process becomes unnecessary. In addition, since the current collecting layer contact electrode on the transparent electrode side is formed away from the light emitting part,
Even the spike voltage that occurs when the EL element is driven to blink does not cause discharge.

In addition, the method for producing an EL element according to the present invention involves arranging a back electrode pattern with an extraction lead and a current collecting layer contact electrode pattern with an extraction lead by photoetching or the like on a synthetic resin roll film having a metal coating.
An insulating layer and a light emitting layer using a thermoplastic binder are sequentially applied on each of the back electrodes by a screen printing method, etc., and on the other hand, a layer is formed on the transparent electrode roll film at the pitch of the current collecting layer contact electrode. In addition, a current collection layer is formed using a large number of thermoplastic pastes, and after aligning both films so that the current collection layer contact electrode and the current collection layer overlap and contact each other, each contact is made by thermocompression bonding or the like. The parts are successively pasted together and the entire member is covered with a moisture-proof film. Therefore, since the take-out leads, which are lead terminals, are formed as metal coatings on the synthetic resin roll film, sufficient strength and flexibility can be achieved. Furthermore, since a large number of EL elements can be formed continuously, the cost can be reduced due to the mass production effect.

〔Example〕

Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIGS. 1 to 6.

FIG. 1 is a partially cutaway view of an embodiment of the EL element according to the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. The substrates 12 and 12' are a back electrode with an extraction lead made of an aluminum film or the like and a current collecting layer contact 1tui with an extraction lead, which are arranged in parallel on the substrate 11. 13
is an insulating layer laminated on the back electrode 12, which is made by dispersing a T-based insulating material in a thermoplastic binder whose dielectric constant has been increased by cyanoethylation or the like.

Reference numeral 14 denotes a light-emitting layer laminated on the insulating layer 13, which is made of a thermoplastic binder similar to that of the insulating layer 13 in which a fluorescent material such as ZnS is dispersed.

Reference numeral 15 denotes a current collecting layer laminated on the current collecting layer contact electrode 12', which is made of a conductive layer such as a thermoplastic resin with silver powder dispersed therein. 16 is a transparent electrode laminated on both the light emitting layer 14 and the current collecting layer 15 so as to cover them; It consists of a vapor-deposited film of T and O. Reference numeral 17 denotes a transparent moisture-proof film that covers and seals the entire above-mentioned member, and 18 denotes each extraction door 1 for the back electrode 12 and the current collecting layer contact electrode 12'.
Eyelets are fixed to each end of 2a and 12'a.

3 to 6 show the manufacturing method of the above embodiment.

First, as shown in FIGS. 3 and 4, a back electrode 12 with a lead for extraction and a back electrode 12 with an extraction lead are formed on a substrate 11, which is formed by depositing or laminating a metal film such as aluminum on a synthetic resin roll film, by photo-etching or the like. A large number of sets are formed by arranging each pattern of current collection layer contact electrodes 12' with leads.

As this pattern shape, various shapes can be considered as shown in FIGS. 5(A) to 5(D).

Next, an insulating layer 13 made of a titanium-based dielectric dispersed in a thermoplastic binder as described above is coated on each back electrode 12 by screen printing or the like and dried. Further, on each insulating layer 13, ZnS2C is applied to the thermoplastic binder as described above.
A light emitting layer 14 in which uC1 phosphor is dispersed is applied in a similar manner and dried.

Next, a large number of thermoplastic current collecting layers 15 as described above are formed on the roll film-shaped transparent electrode 16 in accordance with the pitch of the current collecting layer contact electrodes 12'. Then, as shown in FIG. 6, after aligning the substrate 11 and the transparent electrode 16 so that the current collecting layer 15 and the current collecting layer contact electrode 12' overlap and contact each other, each contact portion is connected by thermocompression bonding or the like. Attach it to the target.

The EL device is completed by separating the large number of light emitting sections thus created and finally covering and sealing each with a moisture-proof film 17. This method allows a large number of EL devices to be formed continuously. Further, if eyelets 18 are fixed to each end of each lead 12a and 12' of the back electrode 12 and current collecting layer contact electrode 12', soldering becomes possible.

The EL element according to the present invention is constructed as described above, and both the lead-out leads 12a and 12'a of the back electrode 12 and current collecting layer contact electrode 12' are located on the same plane. It can be used as a terminal as is, and there is no need for the conventional step of connecting it to an EL light emitting color lead terminal. Therefore, manufacturing becomes easy. or,
Since the current collecting layer contact electrode 12' on the transparent electrode side is formed apart from the light emitting part, no discharge occurs even with the spike voltage that occurs when the EL element is driven to blink.

Therefore, high reliability and high voltage resistance (for example, AC250Vr
ms) exists. Further, since the lead terminals 12a and 12'a are formed as metal coatings on the synthetic resin roll film, the strength and flexibility are sufficient.

Further, according to the method of manufacturing an EL element according to the present invention, a large number of EL elements can be formed continuously, so the cost can be reduced due to the mass production effect.

7 to 9 show other embodiments, FIG. 7 is a plan view of the other embodiment, and FIGS. 8 and 9 are cross sections taken along the line ■-■ in FIG. 7. It is a diagram.

This embodiment differs from the above embodiments in that the take-out leads 12a and 12'a are bent to the back side of the light emitting part, and
Take-out leads 12a, 1 are attached to the moisture-proof film 17 on the back side.
Window portions 19.19 are provided in accordance with the pitch of 2'a so that a portion of each of the takeout leads 12a, 12a is exposed,
This moisture-proof film 17 and the moisture-proof film 17 on the light-emitting side are stacked with the light-emitting part set therein, and then bonded and sealed by thermocompression bonding or the like, thereby opening the window 19 from inside the light-emitting part.
19, the lead terminal can be taken out to the outside of the back surface of the EL element. Therefore, when this EL element is viewed from the light emitting section side, the extraction section is not visible. Therefore, E
The L-emitting color moisture-proof film 17.17 can be placed in the center and sealed, making it possible to manufacture a well-balanced EL device. In addition, a moisture-proof film 17 with the same area
If so, it is possible to manufacture an EL element having a larger light emitting surface than conventional ones.

〔Effect of the invention〕

As mentioned above, the EL device and the method for manufacturing the same according to the present invention have the following important advantages: 1. The cost is low, the strength and flexibility of the lead terminal are sufficient, the manufacturing is easy, and the reliability is high. ing. Furthermore, since the lead terminals can be taken out to the outside of the back surface of the device, it is also possible to manufacture an EL device with a large, well-balanced light emitting surface.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of an embodiment of an EL element according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIGS. 3 to 6 are manufacturing methods of the above embodiment. , FIG. 7 is a plan view of another embodiment, and FIGS. 8 and 9 are respectively FIG.
10 is a plan view of the conventional example, and FIG. 11 is a sectional view taken along line XI-XI in FIG. 10. 11...Substrate, 12...Back electrode, 12'...
... Current collecting layer contact electrode, 12a, 12゛a... Extraction lead, 13.81. Insulating layer, 14... Light emitting layer,
15... Current collecting layer, 16... Transparent electrode, 17...
... Moisture proof 714 Figure 5 Figure 1 5j'6 Figure Off Figure 11 TI'' Figure 18 Figure 19 Figure 10 Figure yit Figure

Claims (3)

[Claims] (1) A back electrode with an extraction lead and a current collecting layer contact electrode with an extraction lead arranged on the same substrate,
an insulating layer and a light emitting layer sequentially stacked on the back electrode;
a current collecting layer laminated on the current collecting layer contact electrode; a transparent electrode laminated thereon so as to cover both the light emitting layer and the current collecting layer; and a moisture-proof film sealing the entire member. An EL element consisting of. (2) The EL element according to claim (1), characterized in that the take-out lead is bent to the back side and a window is provided in a part of the moisture-proof film so that a part of the take-out lead is exposed. . (3) On a synthetic resin roll film having a metal coating, a large number of sets of back electrode patterns with take-out leads and current collecting layer contact electrode patterns with take-out leads are formed side by side, and an insulating layer and a light emitting layer are formed on each of the back electrodes. A large number of current collecting layers are formed on the transparent electrode roll film in accordance with the pitch of the current collecting layer contact electrodes, and both films are coated one after another so that the current collecting layer contact electrodes and the current collecting layer overlap and are in contact with each other. A method for producing an EL element, in which after aligning the parts, each contact part is successively bonded, and the entire member is covered with a moisture-proof film.