JPH0413838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of manufacturing an EL, and more particularly to a method of manufacturing an EL to which an insulated lead wire is attached.

BACKGROUND TECHNOLOGY Organic EL is widely used in backlights of liquid crystal display devices, etc. A conventional organic EL has a structure shown in FIGS. 1 and 2. In the figure, 1 and 2 are resin outer films at least 2 having translucency, and an EL element 3 is sandwiched between them.
The portions of the EL element 3 that protrude from the periphery are sealed together by thermocompression bonding. As is clear from the partially enlarged view of FIG. 2, the EL element 3 includes, for example, a transparent conductive film 5 on a transparent resin base 4, a light-emitting layer 6 in which phosphor is dispersed in an organic binder, and a back surface made of aluminum or the like. The electrode 7 is laminated.
8 and 9 are plate-shaped leads drawn out from the transparent conductive film 5 and the back electrode 7.

In the above configuration, when an AC power source of a predetermined voltage and frequency is connected between the plate leads 8 and 9,
The light emitting layer 6 of the EL element 3 emits light upon application of an electric field, and the light is transmitted to the transparent conductive film 5, the transparent resin base 4,
It exits through the resin outer film 2.

By the way, when this EL is installed in a device such as a liquid crystal display device, the installation position of the EL and the power source are not constant. Therefore, if the EL installation position and the power supply are close, the plate leads 8 and 9 can be connected directly to the power supply terminals, but if the EL installation position and the power supply are far apart, the plate leads 8 and 9 can be connected directly to the power supply terminals. cannot be connected to the power terminals. On the other hand, EL
Manufacturing an EL with plate leads 8, 9 having different lengths depending on the installation position and the distance from the power source has poor mass production effect and causes an increase in cost. In addition, this type of organic EL also has a plate-like lead 8 on the EL element 3.
After connecting the leads 9, the EL element 3 is sandwiched between the resin outer films 1 and 2 and passed between a pair of thermocompression rollers for sealing. A pressure roller is required,
Not only does the equipment cost increase, but the long plate lead8,9
It has the disadvantage that it is bent and untidy, making manufacturing extremely troublesome.

Further, as shown in FIGS. 3 and 4, the copper wires 12 and 13 of the insulated lead wires 10 and 11 are connected and fixed to the plate-like leads 8 and 9 with solders 14 and 15, and the resin outer films 1 and 2 are bonded and fixed. It is also considered that the soldered portion is sealed by thermocompression. However, even with this configuration, the long insulated lead wires 10 and 11 are connected and fixed and sealed by thermocompression, so there are the same drawbacks as described above. Moreover,
As is clear from FIG. 4, the thickness of the insulated lead wires 10, 11 and the soldered portion is generally thicker than the thickness of the EL element 3, and the thermocompression sealing surface becomes uneven, so the thermocompression roller The pressing force on the EL element 3 part tends to be insufficient or vary, which causes poor adhesion between the resin outer films 1 and 2 and the EL element 3, resulting in uneven light emission due to air bubbles, which has the disadvantage of poor marketability. Ta.

DISCLOSURE OF THE INVENTION Therefore, the present invention provides a
The purpose is to provide an easy and inexpensive manufacturing method for EL.

In summary, the present invention includes (a) a step of sandwiching an EL element with a resin outer film, at least one of which is translucent, leading out a plate-shaped lead and sealing it by thermocompression;
(b) forming a protrusion along the plate lead by leaving a portion of the resin outer film along the plate lead wider than the plate lead and removing both sides thereof; and (c) (d) attaching a heat-shrinkable resin tube over the protrusion and the insulation coating layer of the insulation coating lead; (e) ) The heat-shrinkable resin tube is heat-shrinked to tightly seal the protrusion and the insulation coating layer of the insulation coating lead wire.

That is, by shortening the lead-out dimension of the plate-shaped lead and providing the soldering part outside the resin jacket film, a small thermocompression roller can be used before soldering the insulated lead wire to the plate-shaped lead. This enables thermocompression sealing with a uniform pressing force over the entire surface of the EL element, without causing uneven light emission due to bubbles. In addition, a protrusion was formed on the resin sheath film along the direction in which the plate-shaped lead was led, and the heat-shrinkable resin tube was tightly sealed over the protrusion and the insulation coating layer of the insulated lead wire. Even if there are variations in thickness or irregularities in the part, it can be sealed tightly without any problems.Moreover, since the pressing force from the shrinkage of the heat-shrinkable resin tube is applied to the soldered part and the insulation coating layer, the insulation coating can be easily sealed. The pull-out force of the lead wire increases.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 5 shows an embodiment manufactured according to the present invention.
6 is a plan view of a main part of the EL, and FIG. 6 is a cross-sectional view of the EL in FIG. 5 along the - line in the direction of the arrow.

The figure is the same as FIGS. 3 and 4 except for the following points, so the same or corresponding parts are given the same reference numerals. The difference between FIGS. 3 and 4 is that the plate leads 8, 9
is derived from the resin outer films 1 and 2. Second, protrusions 1a and 2 are formed on the resin outer films 1 and 2 along the direction in which the plate leads 8 and 9 are led out.
This means that it forms a. Thirdly, the copper wires 1 of the insulated lead wires 10 and 11 are attached to the plate leads 8 and 9.
After connecting and fixing 2 and 13 with solder 14 and 15,
Projections 1a and 2a of the resin outer films 1 and 2
and the insulation coating layer 1 of the insulation coating lead wires 10 and 11
Heat-shrinkable resin tubes 18 and 19 are placed across 6 and 17.
is tightly sealed by heat shrinking.

Here, each protrusion 1 of the resin outer film 1, 2
a, 2a are not formed from the beginning and sealed by thermocompression, but are initially formed using resin outer films 1, 2 whose edges are straight, as shown by the two-dot chain line 20 in FIG. After thermocompression sealing, the portion 20 along the two-dot chain line is cut and removed.

According to the above configuration, the resin outer films 1 and 2
Up to the thermocompression bonding and sealing process of the EL element, the manufacturing method can be exactly the same as that of the conventional EL shown in FIGS. 1 and 2. In other words, it is possible to manufacture the EL of the present invention using conventional EL. Therefore, compared to the case where long plate leads or insulated lead wires are attached and sealed by thermocompression, a smaller thermocompression roller can be used, and the EL
Since the entire element 3 can be sealed with uniform pressure, no bubbles are generated due to poor adhesion, and uneven light emission is eliminated. In addition, since the resin outer films 1, 2 and the insulated lead wires 10, 11 are integrated by the heat-shrinkable resin tubes 18, 19, the insulation coated lead wires 10, 11 have high moisture resistance and have high pull-out resistance. It's also big. In addition, insulated lead wires 10, 1
There is no problem in using a thick one as No. 1. As a result of the above, by implementing the present invention, the product quality can be improved and the cost can be reduced.

Note that the protruding portions 1a of the resin outer films 1 and 2,
By making the width of the tube 2a wider toward the periphery or by forming a notch in the middle of its length, the heat-shrinkable resin tubes 18 and 19 can be embedded into the protrusions 1a and 2a and are tightly attached. As a result, the tensile force applied to the insulated lead wires 10 and 11 is transferred to the protrusion 1.
a, 2a, so the insulated lead wire 10,
The pull-out strength of No. 11 can be further increased.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional EL. FIG. 2 is a sectional view taken along the - line of EL in FIG. 1 in the direction of the arrow. Figure 3 shows a conventional insulated lead wire.
FIG. 3 is a plan view of EL. Figure 4 shows the − of EL in Figure 3.
FIG. 3 is a cross-sectional view along the line in the direction of the arrow. FIG. 5 shows an example manufactured by the manufacturing method of the present invention.
FIG. 3 is a plan view of EL. Figure 6 shows the − of EL in Figure 5.
FIG. 3 is a cross-sectional view along the line in the direction of the arrow. 1, 2...Resin outer film, 1a, 2a...
Projection portion, 3...EL element, 8, 9...Plate lead,
10, 11... Insulated lead wire, 12, 13...
...Copper wire, 14,15...Solder, 16,17...Resin coating layer, 18,19...Heat-shrinkable resin tube.

Claims (1)

[Scope of Claims] 1 (a) A step of sandwiching an EL element with a resin outer film, at least one of which is translucent, and leading out a plate-shaped lead and sealing it by thermocompression; (b) of the resin outer film (c) forming a protruding portion along the plate-shaped lead by leaving a portion along the plate-shaped lead wider than the plate-shaped lead and removing both side portions; (c) forming a protrusion along the plate-shaped lead; (d) attaching a heat-shrinkable resin tube across the protruding portion and the insulation-covering layer of the insulated lead wire; (e) heating the heat-shrinkable resin tube. Let it shrink,
A method for manufacturing an EL, including the step of tightly sealing the protruding portion and an insulating coating layer of an insulating coated lead wire.