JPS631437Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to an organic EL, and more specifically to improving its sealing structure.

Background Art EL basically has a structure in which an electroluminescent layer is sandwiched between a pair of electrodes, at least one of which is transparent. Conventionally, these ELs can be roughly divided into two types: enamel type (or inorganic type) and plastic type (or organic type). The latter, compared to the former,
Because it is thin, light, and provides high brightness,
Recently, the latter has been prized.

FIG. 1 shows a partially cutaway plan view of this type of organic EL, and FIG. 2 shows an exploded sectional view taken along the - line in FIG. 1. In the figure, 1 is an EL element, and this EL element 1 is sandwiched from above and below by two transparent resin outer films 2 and 3, and the parts of both outer films 2 and 3 that protrude from the periphery of the EL element 1 are sealed. It is sealed by crimping. The EL element 1 includes a first structure in which a reflective insulating layer 5 and a light emitting layer 6 in which fluorescent particles are dispersed in an organic dielectric are laminated on a back electrode layer 4 made of aluminum foil, and a transparent A second structure in which a transparent electrode layer 8 is formed on a resin film 7 is constructed by temporarily fixing one lead 9 on the back electrode layer 4 and temporarily fixing the other lead 10 on the transparent electrode layer 8. The light emitting layer 6 of the first structure and the transparent electrode layer 8 of the second structure are stacked and pressed together so as to face each other.

However, according to the above structure, the light emitted from the light emitting layer 6 passes through the transparent electrode layer 8, the transparent resin film 7, and the outer film 2 and exits to the outside, so there is a problem that the attenuation due to the absorption of these lights is large. It was hot. Furthermore, forming the transparent electrode layer 8 directly on the outer skin film 2 without the transparent resin film 7 is
There was a problem in that the sealing properties of the outer skin films 2 and 3 were impaired, resulting in poor moisture resistance. Furthermore, the method of thermocompression sealing the two outer skin films 2 and 3 has leads 9 and 10 in a protruding shape in some parts, which not only has poor workability but also tends to result in incomplete sealing. There were also some problems.

DISCLOSURE OF THE INVENTION Therefore, the purpose of this invention is to provide an organic EL that has higher brightness, excellent moisture resistance, and is easy to manufacture.

Simply put, this idea consists of one side of the sealing body being made of a transparent glass substrate with a transparent electrode layer formed thereon, and the other side of the sealing body being covered so that a portion of the transparent electrode layer and the back electrode layer are exposed. It is characterized by being composed of a resin outer skin layer.

As mentioned above, this invention has a transparent electrode layer formed on a transparent glass substrate, so compared to the conventional transparent resin film and transparent resin outer film, attenuation due to light absorption is small and high brightness can be obtained. Furthermore, since a portion of the transparent electrode layer and the back electrode layer are directly exposed, it is significantly easier to manufacture and has improved moisture resistance compared to a method in which leads are led out.

BEST MODE FOR CARRYING OUT THE INVENTION Examples of the invention will be described below with reference to the drawings.

Figure 3 shows a partially cutaway plan view;
The figure shows an exploded sectional view taken along the - line in FIG.

In the figure, 20 is a transparent glass substrate, on one side of which a transparent electrode layer 21 such as ITO is formed. Reference numeral 22 denotes a back electrode layer made of aluminum foil, on which (at the bottom in the drawing) a reflective insulating layer 23 made of a high dielectric material and a light emitting layer 24 made of a high dielectric constant resin in which a fluorescent material is dispersed are formed. light emitting layer 2
The fourth side is pressed to the transparent electrode layer 21.
Reference numeral 25 denotes a resin outer film made of trifluoroethylene, polyester resin, etc., which has a coating layer 26 made of polyethylene resin on one side, and a notch 27 in a part of the periphery (lower left corner in FIG. 3). It has a window hole 28 in the center. Then, a silane coupling agent 29 is applied to the lower surface of the coating layer 26, and the resin outer film 25 is attached to the back electrode layer 2.
2 and the transparent electrode film 21.

According to the above configuration, the transparent electrode layer 21 is exposed at the lower left corner of FIG. 3, and the back electrode layer 2 is exposed at the center.
2 is exposed. Therefore, if both contacts of the lighting power source are pressed into contact with the above two locations, power can be supplied and lighting can be performed.

In the above embodiment, the resin outer film 25 is bonded via the silane coupling agent 29, but an epoxy resin or the like may be applied directly.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of a conventional organic EL. FIG. 2 is an exploded cross-sectional view of the organic EL shown in FIG. FIG. 3 is a partially cutaway plan view of an organic EL according to an embodiment of this invention. FIG. 4 is an exploded sectional view taken along the - line in FIG. 3. 20... Transparent glass substrate, 21... Transparent electrode layer, 22... Back electrode layer, 24... Light emitting layer, 25
...Resin outer skin layer (resin outer skin film).

Claims (1)

[Scope of utility model registration request] On a transparent conductive film formed on a transparent glass substrate, a back electrode layer having a smaller area than this transparent conductive film and having at least a light emitting layer formed thereon is pressure-bonded with its light emitting layer surface. Organic EL that is covered with a resin outer layer except for a part.