JPH0461478B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an EL (electroluminescence) element.

[Conventional technology]

Conventionally, as shown in FIG. 2, the EL element 1 generally comprises a base material by forming an insulating layer 3 and a light emitting layer 4 on the upper surface of a back electrode 2 such as aluminum foil, and A transparent conductive film 5 is formed by vapor-depositing indium oxide (ITO) on one surface of a polyester film, etc., on the light-emitting layer 4, and the ITO-deposited film is thermocompressed so that it faces the light-emitting layer 4, and then Moisture-proof film 6 from above and below
When a voltage is applied between the back electrode 2 and the transparent conductive film 5, an electric field is generated in the EL material consisting of the insulating layer 3 and the light emitting layer 4. This generation causes the light-emitting layer 4 to emit light.

Here, a voltage drop occurs as the distance from the extraction electrode portion 5a on the side of the transparent conductive film 5 increases, but in order to prevent this, conductive metal paste such as Ag is applied to the lower surface of the transparent conductive film 5. The routing electrode 7 is formed by attaching it by screen printing or the like, and the routing electrode 7 is bonded to the light emitting layer 4 by thermocompression bonding and is connected to the extraction electrode portion 5a.

In this way, a predetermined voltage is applied from the extraction electrode portion 5a to almost the entire surface of the transparent conductive film 5 via the routing electrode 7,
Uniform light emission is performed over the entire surface of the EL element 1.

[Problem that the invention seeks to solve]

However, since the positional relationship of the extraction electrode part 5a with respect to the routing electrode 7 is uniquely determined at the time of forming the routing electrode 7, it is difficult to design when manufacturing EL elements of various arbitrary lengths. It is difficult to respond flexibly to changes, and it is necessary to individually design and manufacture each length, and when manufacturing an even longer EL element, the lead electrode 7 There is a limit to the size of the mask plate used for printing, and the resistivity of the lead electrode 7 is relatively high, so it is virtually impossible to manufacture an extremely long EL element. Ta.

In view of the above points, the present invention can flexibly correspond to various arbitrary lengths, can be manufactured at low cost, and can be easily manufactured even when the EL element is long.
The purpose is to provide a method for manufacturing EL elements.

[Means and actions for solving problems]

According to the present invention, the above object is achieved by forming a base material on which an insulating layer and a light emitting layer are sequentially formed on a long back electrode.
A long transparent conductive film is laminated, and a lead electrode made of a tape-shaped metal foil is placed on the underside of the transparent conductive film along one longitudinal edge of the film.
A long EL cell is manufactured in advance by inserting and crimping the EL cell so that a part thereof protrudes laterally from one edge, and the EL cell is adjusted to the desired length in the longitudinal direction. A method for manufacturing an EL device, in which the EL device is manufactured by cutting it and sealing it with a moisture-proof film from above and below, and the portion of the above-mentioned routing electrode that protrudes laterally from the EL cell is used as an electrode element for power supply. This is achieved by

According to this invention, a pre-configured EL cell is cut to a desired length, and the lead-out electrode protruding laterally from the EL cell is removed, leaving a portion that will become the extraction electrode section. After that, the EL device is manufactured by sealing it with moisture-proof film from above and below so that the part that is to become the extraction electrode protrudes outside. Furthermore, long EL elements can be manufactured, and design changes can be easily accommodated. In addition, since the routing electrode is made of tape-shaped metal foil, it has a relatively low resistivity, and even when manufacturing an extremely long EL device, the voltage drop can be further reduced. The light emission becomes more uniform over the entire surface.
Furthermore, since one longitudinal side of the routing electrode protrudes laterally from the EL cell and is used as an electrode terminal, connection resistance of the electrode terminal to the routing electrode is eliminated, and the EL element can be manufactured more easily. .

〔Example〕

Hereinafter, the present invention will be explained in more detail based on one embodiment shown in the drawings.

FIG. 1 shows an embodiment of the method for manufacturing an EL device according to the present invention, and a long EL cell 11 that constitutes an EL device 10 is as shown in FIG. 1A.
An insulating layer 13 containing dielectric powder such as barium titanate (BaTiO 3 ) is formed on the upper surface of the back electrode 12 made of a long aluminum foil, etc., and a fluorescent material such as zinc sulfide (ZnS) is similarly formed on the insulating layer 13 containing dielectric powder such as barium titanate (BaTiO ₃ ). The base material 15 is constituted by forming the light emitting layer 14 including the body.
Here, along one side edge 15a extending in the longitudinal direction of the base material 15, a routing electrode 16 made of tape-shaped metal foil, for example, copper foil, is placed so that one side edge 16a in the longitudinal direction is attached to the base material 15. A transparent film is formed by vapor-depositing indium oxide (ITO) on one surface of a polyester film, etc., and is disposed so as to protrude laterally from the side edge 15a of the base material 15. It is constructed by thermocompression bonding a conductive film 17 with its ITO vapor deposited film facing the light emitting layer 14.

Here, as shown in FIG. 1B, the routing electrode 16 is provided with an insulating film 16b on its lower surface so that it does not come into direct contact with the light emitting layer 14, and has a conductive film on its upper surface. adhesive 16
c, so as to ensure electrical contact with the lower surface of the transparent conductive film 17 during thermocompression bonding of the transparent conductive film 17.

When manufacturing the EL element 10 using the EL cell 11 configured in this way, first, as shown by the chain line a in FIG. Along with cutting,
The routing electrode 16 that protrudes laterally from one side edge of the EL cell 11 is removed by cutting along the dotted line b, leaving a portion that will become the extraction electrode portion 16d (see Figure 1C). .

At that time, the routing electrode 16 is connected to the insulating film 16
b and the conductive adhesive 16c, and the transparent conductive film 17 is tightly attached to the lower surface of the transparent conductive film 17 by the conductive adhesive 16c.
There's no way it's going to separate from 7.

Next, as shown in FIG. 1D, after attaching the electrode terminals 12a to the lower surface of the back electrode 12, the EL element 10 is completed by sealing with moisture-proof films 18 from above and below by thermocompression bonding or the like.

The method for manufacturing an EL element according to the present invention is configured as described above, and this EL element 10 is configured as follows.
Since the EL cell 11 can be provided by cutting a pre-constructed elongated EL cell 11 into desired, ie, various arbitrary lengths, it is possible to manufacture the EL cell 11 using one common elongated EL cell. This makes it possible to flexibly respond to changes in the design of the EL element.

Furthermore, since the routing electrode 16 provided along one longitudinal edge of the transparent conductive film 17 is made of tape-shaped metal foil, it has a higher resistance than a conventional routing electrode that is screen-printed with silver paste, for example. This results in an electrode with a low lead rate. Further, the electrode terminal for feeding power to the EL element 10 is constituted by the extraction electrode portion 16d of the routing electrode 16 that projects laterally from the EL cell 11. Therefore, since the electrode terminal is integrally formed with the routing electrode, the contact resistance with respect to the routing electrode becomes zero.

In addition, in the above embodiment, since the routing electrode 16 is made of tape-shaped metal foil,
The base material 14, metal foil 16, transparent conductive film 1
If 7 is manufactured into long lengths and stored on a roll, or if these are stacked and stored on a roll, it is possible to cut out the required length when needed, making it possible to create any length. long EL
The device can be manufactured and can easily be manufactured continuously.

〔Effect of the invention〕

As described above, according to the present invention, a long transparent conductive film is laminated on a base material in which an insulating layer and a light emitting layer are sequentially formed on a long back electrode. By inserting and crimping a lead electrode made of a tape-shaped metal foil along one longitudinal edge of the lower side so that a part of it protrudes laterally from the one edge, a long electrode can be made in advance. shaku EL
A cell is manufactured in advance, and the EL element is manufactured by cutting the EL cell into a desired length in the longitudinal direction and sealing it with a moisture-proof film from above and below, and then protruding laterally from the EL cell of the routing electrode. Since I used the part where it is connected as an electrode terminal for power supply,
Cut the pre-configured EL cell to the desired length, leaving the part that will become the extraction electrode part.
After removing the lead-out electrodes that protrude laterally from the EL cell, the EL element is manufactured by sealing it with a moisture-proof film from above and below so that the part that should become the extraction electrode protrudes outside. ,
Using the above-mentioned EL cell, it is possible to manufacture EL elements of various arbitrary lengths, and even long ones, making it possible to easily accommodate design changes.

Furthermore, according to the present invention, since the lead electrode is made of tape-shaped metal foil, it has a relatively low resistivity, and even when manufacturing an extremely long EL element, the voltage drop is further reduced. Since it can be done, EL
The light emission of the device becomes more uniform over its entire surface, and one longitudinal side of the routing electrode is
Since it is used as an electrode terminal by protruding laterally from the cell, there is no connection resistance of the electrode terminal to the routing electrode, and the EL element can be manufactured more easily.

Thus, according to the present invention, by using preconfigured long EL cells, various arbitrary lengths can be flexibly manufactured at low cost, and long EL elements can be manufactured at low cost. It has the important practical advantage that it can be easily manufactured even in cases where it is used.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the method for manufacturing an EL device according to the present invention, in which A is a partial perspective view of a long EL cell, B is a cross-sectional view of a lead-out electrode, and C is a cut to a desired length. A perspective view of the EL cell, and D is an exploded perspective view of the EL element. FIG. 2 is a sectional view showing an example of a conventional EL element. 10...EL element; 11...EL cell; 12...
Back electrode; 13... Insulating layer; 14... Light emitting layer; 1
5... Base material; 16... Leading electrode; 16d... Extracting electrode portion; 17... Transparent conductive film; 18...
...Moisture-proof film.

Claims (1)

[Claims] 1. A long transparent conductive film is laminated on a base material in which an insulating layer and a light emitting layer are sequentially formed on a long back electrode. A long EL cell is manufactured in advance by inserting and crimping a lead electrode made of tape-shaped metal foil so that a part of it protrudes laterally from one edge. 1. A method for manufacturing an EL device, which comprises cutting an EL cell into a desired length in the longitudinal direction and sealing it from above and below with a moisture-proof film.