JPH07211459A - Electroluminescent lamp - Google Patents

Abstract

PURPOSE:To provide a thin electroluminescent lamp at low cost in which a lead can surely and easily be taken out of a transparent electrode and a back electrode without using an outer film and which can easily and firmly be connected electrically to an external power source. CONSTITUTION:A current collecting band 2 is extended onto a non-emitting portion and formed on a transparent conductive film 1 to serve also an externally led-out lead, and a light emitting layer 3 of a phosphor coated for proofing moisture and a reflective insulating layer 4 of a high dielectric property are formed sequentially by printing, and a back electrode 5 is extended onto the non-emitting portion and formed on the layers, and then a conductive paste is applied to the extended portion 5a. Next, a protective film or an insulating protective layer 9 of an insulating paste or the like is formed in such a way that the extended portion 2a of the current collecting band 2 and that 5a of the back electrode 5 are exposed. Thus a thin electroluminescent lamp having a thinned lead led-out portion can easily be manufactured at low cost and can be firmly and easily connected to an external power source by attaching a feeder portion directly to the extended portions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroluminescent lamp, and more particularly to a thin electroluminescent lamp which does not use a conventional skin film.

[0002]

2. Description of the Related Art In a conventional electroluminescent lamp 80, as shown in an enlarged sectional view of an essential part of FIG. 7, an electroluminescent element 67 having a substantially rectangular planar shape composed of a laminate described later is provided with a moisture-proof resin such as a fluorine resin. It has a structure in which it is hermetically sealed by outer skin films 68 and 69 having properties.

The electroluminescent device 67 is arranged in order from the lower layer.
The back electrode 61, the reflective insulating layer 62, the light emitting layer 63, and the transparent electrode 64 are laminated and formed. Incidentally, 65, 66 in the figure
Is a hygroscopic layer formed of a hygroscopic film such as polyamide disposed above and below the electroluminescent element 67. Here, as described in JP-A-58-108691, the lead 61a of the back electrode 61 is temporarily fixed to one end of the back electrode 61 with an adhesive tape 71, and the outer films 68, 6 are formed.
It is sandwiched between the moisture absorption film 65 and the back electrode 61 by the sealing of No. 9, and is fixed by the sandwiching force.
The lead 64 a of the transparent electrode 64 is temporarily fixed to one end of the transparent electrode 64 with an adhesive tape 72, and the outer film 6
It is sandwiched between the light emitting layer 63 and the transparent electrode 64 by the sealing of 8 and 69, and is fixed by the sandwiching force.

[0004]

However, since the leads are connected by the above-mentioned method, the strength of the connecting portion is weak, the material cost of the leads is high, the man-hours for attaching the leads are high, and the accuracy of the lead extraction position is ensured. There was a problem that it was difficult to do. Generally, the lead of an electroluminescent lamp is 100
A phosphor bronze tin plated plate of about μm is used, and the overall thickness of the electrode part is 1.1 to 1.2 mm, which is locally thick, so that the outer film is removed and the thickness of the lead attachment part is reduced. Otherwise, a thin electroluminescent lamp cannot be obtained as a whole. Therefore, the present invention has been proposed in consideration of the above problems, and the purpose thereof is to provide a transparent electrode with excellent moisture resistance and a long life, even though the conventional skin film and lead are not used. An object of the present invention is to provide a thin, low-cost electroluminescent lamp having electrode lead-out portions that can easily and surely electrically connect the back electrode to an external power source.

[0005]

The electroluminescent lamp of the present invention comprises:
A film with a transparent electrode, a light-emitting layer in which a phosphor with a moisture-proof coating is dispersed in resin, a reflective insulating layer in which a high dielectric substance is dispersed in resin, a back electrode made of carbon paste, and insulation protection A laminate comprising a layer, and extending a current collecting band formed on the transparent electrode and a part of the back surface electrode on the film, respectively,
It is characterized in that a lead-out portion made of a conductive paste is formed by printing on the extension portion of the back electrode.

Further, the current collector and the extension portion of the back electrode are laminated at least via a reflective insulating layer, and a double-structure eyelet having an inner conductor and an outer conductor is attached to the laminated extension portion. However, each conductor is electrically connected to the transparent electrode or the back electrode.

[0007]

[Function] By extending a part of each of the transparent electrode and the back surface electrode on the same base material to form an electrode take-out portion, a thin electroluminescent lamp can be realized without the need for a conventional outer film and leads. By printing and laminating the conductive paste on the portion, loose contact with the external power feeding portion can be eliminated and reliability can be improved. In addition, by forming the extension portions of both the electrodes in a laminated manner and mounting the eyelets having the coaxial structure,
Since a single eyelet can supply power to both the transparent electrode and the back electrode, the number of steps can be reduced, and a thin electroluminescent lamp that can be easily and reliably electrically connected to an external power source or the like can be provided at low cost.

Further, since the phosphor coated with the moisture-proof coating is used for the light-emitting layer, the conventional moisture-proof outer film is not required, and a thin and long-life electroluminescence lamp can be provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and manufacturing method of the electroluminescent lamp of the first embodiment of the present invention will be described with reference to FIGS.
As shown in the perspective view of FIG. 1 and the manufacturing process diagram of FIG. 2, the electroluminescent lamp 10 of the present invention first comprises ITO1b on a part of a base material having an extending portion 1a as shown in FIG. 2B, the current collector 2 made of silver paste or the like is formed to extend on the extending portion 1a of the base material so as to also serve as an external lead. The extending portion of the current collector is 2a. Next, as shown in FIG. 2C, a light emitting layer in which a phosphor (for example, Sylvania phosphor Type.20) in which a phosphor in which zinc sulfide is activated by copper is moisture-proof coated is dispersed in a high dielectric resin (for example, fluorine resin). 3. A reflective insulating layer 4 in which an insulating material such as barium titanate is dispersed in a high dielectric resin (for example, fluorine resin) is sequentially formed by printing in a range slightly wider than the ITO 1b. In addition, as shown in FIG.
As shown in (d), a main electrode of the back electrode 5 made of, for example, carbon paste has a size and shape slightly smaller than those of the reflective insulating layer and the light emitting layer, and a part of the pattern is extended onto the extension 1a of the base material. After the selective formation by, a silver paste or the like is applied to the extending portion to form the extending portion 5a of the back electrode to obtain the laminated film 6 which is used as the power feeding portion. Next, as shown in FIG. 2E, the extended portion 2a of the current collector 2 and the extended portion 5a of the back electrode 5 are exposed, and the main portion of the back electrode, the reflective insulating layer, and the light emitting layer are covered. An electroluminescent lamp 10 is obtained by attaching an insulating film to the laminated film 6 or applying an insulating paste to the laminated film 6 to form an insulating protective layer 9. In this way, by forming the transparent electrode 1b formed on the transparent conductive film 1 and the respective extending portions 2a and 5a of the back surface electrode 5 by printing the conductive paste to form the lead portions,
A thin electroluminescent lamp with improved reliability of contact with an external power source can be easily and inexpensively manufactured. It is also possible to extend a part of the ITO 1b in FIG. 2 (a) and form the extending portion 2a of the current collector on the ITO 1b. In this case, the extending portion is doubled so that reliability is improved. Is improved. Further, the insulating protection layer 49 may cover the extended portion 45a of the back electrode.

Next, a second embodiment of the present invention will be described. In the first embodiment, an example in which a conductive paste is formed on the extended portion of the electrode to facilitate contact with an external electrode and the reliability is improved has been described. An example in which the structure is simplified will be described. FIG. 3 (a) is a perspective view of the coaxial eyelet type power feeding electrode 30 according to the present invention, and FIG. 3 (b) is a sectional view. As shown in the figure, an insulator 32 is provided between the inner conductor pipe 31 and the outer conductor pipe 33.
Power can be fed through the two coaxial terminals of the inner conductor tube 31 and the outer conductor tube 33 via the. Next, an electroluminescent lamp equipped with the coaxial eyelet type power supply electrode 30 will be described. As shown in the enlarged cross-sectional view of the main part of FIG. 4 and the manufacturing process diagram of FIG. 5, the electroluminescent lamp 40 of the present embodiment is first provided on a substrate having an extending part 41a as shown in FIG. 5 (a). As shown in FIG. 5B, a current collecting band 42 made of silver paste or the like is extended to the non-light emitting portion on the transparent conductive film 41 on which the ITO 41b is partially formed by printing, vapor deposition or the like so as to also serve as an external lead. . The extension part of the current collector is 42A. Next, as shown in FIG. 5C, a light emitting layer 43 in which a moisture-proof coated phosphor is dispersed in a high dielectric resin, and a reflective insulating layer 44 in which an insulator such as barium titanate is dispersed in a high dielectric resin are formed on the ITO 41b and the collector. Printing is sequentially performed so as to cover the electric band 42 and the extending portion 42a. Further, as shown in FIG. 5D, a back electrode 45 made of, for example, carbon paste is formed on the reflective insulating layer 44 in a size and shape slightly smaller than the insulating layer and the light emitting layer, and a part of the back electrode 45 extends. Further, the laminated film 46 is obtained by selectively forming so that a part of the extending portion is located at substantially the same position as the extending portion 42a of the current collecting band. Next, as shown in FIG. 5E, an insulating film is attached to the laminate film 46 on the back surface side so that the extended portion 45a of the back electrode 45 is exposed, or an insulating protective layer 49 coated with an insulating paste is formed. By being formed, the extension 42a of the transparent electrode and the extension 45a of the back electrode are formed.
Thus, the electroluminescent lamp 40 is obtained in which and are laminated via the light emitting layer 43 and the reflective insulating layer 44. After that, the perforated portion 50 is provided in the extending portion 45a of the back surface electrode 45, and the eyelet-type power supply electrode 30 shown in FIG. 3 is pierced through the perforated portion 50 from the transparent conductive film 41 side to the back electrode extension portion 45a and caulking. As a result, as shown in FIG. 4, the ITO 41b and the back surface electrode 45 are connected to the outer conductor tube 33 and the inner conductor tube 3 of the eyelet type power feeding electrode 30, respectively.
A thin electroluminescent lamp connected to each of 1 is obtained. And
A pin-type connector 60 including an inner pin 52 and a peripheral electrode 53 as shown in FIG. 6 is inserted into the eyelet-type power feeding electrode 30,
By connecting the inner conductor tube 31 and the inner pin 52, and the outer conductor tube 33 and the peripheral electrode 53, respectively, they can be connected to an external power source. As described above, according to the present embodiment, since the electroluminescent lamp can be supplied with power by one eyelet, the number of steps for attaching the power supply electrode can be simplified, and a thin electroluminescent lamp with high reliability can be provided easily.

If a conductive paste is printed on the carbon paste of the extension 45a, the electrical connection with the eyelet will be further improved. In addition, the eyelet type power feeding electrode 3
You may make 0 penetrate from the back surface electrode side.

In the first and second embodiments, the thickness of each layer suitable for solving the problems of the present invention is in the following range. That is, the transparent conductive film has a thickness of 50 to 250 μm.
m (100-200 μm is most suitable). Further, the total thickness of the printed layers including the light emitting layer, the reflective insulating layer, the back electrode, and the insulating protective layer (about 10 μm in the case of printing) is 100 to 120.
μm is suitable. In particular, when a resin film is used instead of the printed insulation protection total, the resin film is preferably about 50 μm in terms of cost, strength, process, etc.
It becomes 160 μm. Therefore, the desirable thickness of the entire electroluminescent lamp of the present invention is 150 when the insulating protective layer is printed.
To 370 μm, and when using a resin film as an insulating protective layer, it becomes 190 to 410 μm, and in any case, a conventional electroluminescent lamp (one in which leads are contacted with a transparent electrode and a back electrode and sealed with an outer film) 1.1 ~
The thickness is less than half of 1.2 mm.

[0013]

According to the present invention, a part of the transparent electrode and the back surface electrode are arranged side by side on the same surface of the substrate,
A thin electroluminescent lamp can be realized at low cost by eliminating the outer cover film and the leads, and by connecting the extending portion with a power feeding portion made of a conductive paste by printing, the connection with an external power source can be made easy and reliable. it can.

Further, on the same base material, the respective extension portions of the transparent electrode and the back surface electrode are laminated and formed with the light emitting layer and the reflective insulating layer interposed therebetween, and the eyelet having a double structure is attached to the extension portions. Thus, since power can be supplied to both electrodes with one eyelet, the power supply electrode of the electroluminescence lamp can be easily attached at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of an electroluminescent lamp showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a manufacturing process of the electroluminescent lamp according to the first embodiment of the present invention.

FIG. 3 is a perspective view and a vertical sectional view showing a coaxial eyelet type power feeding electrode according to a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part of an electroluminescence lamp equipped with a coaxial eyelet type power supply electrode according to a second embodiment of the present invention.

FIG. 5 is a plan view showing a manufacturing process of the electroluminescent lamp according to the second embodiment of the present invention.

FIG. 6 is a sectional view showing a pin-type connector to be inserted into the coaxial eyelet-type power feeding electrode according to the second embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view of a main part of a conventional electroluminescent lamp.

[Explanation of symbols]

 1,41 Transparent conductive film 1a, 41a Base material extended portion 1b, 41b ITO 2,42 Current collecting band 2a, 42a Current collecting extended portion 3,43 Light emitting layer 4,44 Reflective insulating layer 5,45 Back surface Electrodes 5a, 45a Extension part of backside electrode 6,46 Laminated film 9,49 Insulation protection layer 10,40 Electroluminescence lamp 30 Coaxial eyelet type feeding electrode 31 Inner conductor tube 32 Insulator 33 External conductor tube

Claims (4)

[Claims] 1. A film comprising a transparent electrode, a light emitting layer in which a phosphor coated with a moisture-proof coating is dispersed in a resin, a reflective insulating layer in which a high dielectric substance is dispersed in the resin, and a carbon paste. A back electrode and a laminated body composed of an insulating protective layer, and a part of the current collector and the back electrode formed on the transparent electrode are respectively extended onto the film, and the extension portion of the back electrode is formed. An electroluminescent lamp characterized in that a lead-out portion made of a conductive paste is formed by printing on. 2. A transparent conductive film, a light emitting layer, a reflective insulating layer,
A laminate having a back electrode and an insulating protective layer is formed, and a current collecting band formed on the transparent electrode and a part of the back electrode are respectively extended, and the extended portions are laminated at least via a reflective insulating layer. Electroluminescent lamp. 3. The thickness of the electroluminescent lamp is 150 μm to 41.
The electroluminescent lamp according to claim 1, wherein the electroluminescent lamp has a thickness of 0 μm. 4. The electroluminescent lamp according to claim 2, wherein a double-structured eyelet having an inner conductor and an outer conductor is attached to the extended portion, and each conductor is electrically connected to a transparent electrode or a back electrode. An electroluminescent lamp characterized in that