JPH0742084U - Electroluminescent device - Google Patents

Abstract

(57) [Abstract] [Purpose] Since the first and second electrode terminals are printed on the back electrode side so that there is no stepped portion, the light emitting surface can be fully utilized, and commercial and design characteristics are improved. Since it is improved, power supply from an external drive circuit is easy and the first and second electrode terminals and the moisture-proof layer can be formed by printing, a thin EL element can be obtained. [Structure] The transparent electrode 16 is formed on an insulating and transparent base film 15. The light emitting layer 3 and the insulating layer 2 are transparent electrodes
First lead-out portions 3a and 2a and second lead-out portions 3b and 2b are sequentially laminated on at least one end side on the layer 16. The first electrode terminal 1a and the back electrode 1 integral therewith are laminated on the insulating layer 2 and the first lead portion 2a of the insulating layer 2. The second electrode terminal 16a is laminated on the second lead portion 2b formed on the insulating layer 2, electrically connected to the transparent electrode 16 and electrically separated from the back electrode 1. Moisture barrier 18
Is formed on the back electrode 1 so that at least a part of the first and second electrode terminals 1a and 16a is exposed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for taking out electrode terminals in an electroluminescent device (hereinafter referred to as an EL device).

[0002]

[Prior art]

 EL elements in which a light emitting layer exhibiting an EL phenomenon is sandwiched between electrodes are disclosed in JP-A-62-52884 and JP-A-64-10997, and as shown in FIGS. On a reflective back electrode 1 made of aluminum foil or the like, an insulating layer 2 made of yttrium oxide, silicon nitride, or the like, and a base material such as zinc sulfide added with a luminescent center such as manganese, or the like, are used. The light emitting layer 3 mixed in the binder is sequentially laminated by a screen printing method or the like. On the other hand, a transparent electrode 4 made of a visible light transmitting electrode material such as tin oxide or indium oxide, and a current collecting band 5 made of silver pace or the like on the outer peripheral portion of the transparent electrode 4 made of a polyester film or the like. It is formed on one surface of the transparent sheet 6 by vapor deposition or sputtering, and is arranged on the light emitting layer 3 so that the transparent electrode 4 is in contact with the light emitting layer 3, and a current collecting band 5 connected to the back electrode 1 and the transparent electrode 4. A pair of lead pins 9 and 10 serving as electrode terminals are connected to the and using adhesive tapes 7 and 8, and the lead pins 9 and 10 are pulled out in the circumferential direction. The entire light-emitting part 11 composed of the laminated body of the grate 6 is surrounded by a pair of sealing films 12 and 13 made of a visible light-transmitting polymer film or the like with an adhesive and subjected to a laminating treatment to form a thin flat plate. EL element 14 is formed.

Then, when the lead pins 9 and 10 are connected to an electrode portion of an external drive circuit (not shown) and a predetermined voltage is applied, the light emitting layer 3 between the back electrode 1 and the transparent electrode 4 emits surface light. It is something to do.

[0004]

[Problems to be solved by the device]

 Since the back electrode 1 and the transparent electrode 4 are thin and weak materials, they cannot be directly connected to the electrode part of the external drive circuit, and conventionally, as described above, the back electrode 1 and the transparent electrode 4 are connected together. Lead pins 9 and 10 made of copper foil or the like that can be connected to the electrode portion are fixed to the electric band 5 with adhesive tapes 7 and 8. The lead pins 9 and 10 are attached in a mounting step. However, the productivity is low because it is complicated, and there are problems such as poor contact, falling off, and deformation, etc., because they are only fixed with adhesive tapes 7 and 8. Further, since the current collecting band 5 and the adhesive tapes 7 and 8 are non-transmissive, as the area increases, the area covering the light emitting layer 3 also increases, and accordingly the light emitting area of the light emitting section 11 decreases. There is a problem in that the shape and the productability of the EL element 14 are impaired because the shape of the light emitting portion 11 is restricted.

Further, there is a stepped portion between the lead pins 9 and 10, and when the lead pins 9 and 10 are electrically connected to an electrode portion of an external drive circuit (not shown), the lead pins 9 and 10 are deformed, or However, there is a problem that not only the workability is bad in the manufacturing process but also the quality is deteriorated, because a dedicated lead pin has to be prepared.

Further, when fixing the lead pins 9 and 10 with the adhesive tapes 7 and 8, there is a thickness between the lead pins 9 and 10 and the adhesive tapes 7 and 8 (the thickness of the lead pins 9 and 10 is about 80). ~ 150 μm, the thickness of adhesive tape 7, 8 is about 50-75 μm), and that part rises. When used as a backlight for precision equipment such as wristwatches (digital watches, etc.), clearance with the display However, there was a problem in that the ridge hits the display and cannot be used as a backlight because it is so small.

[0007]

[Means for Solving the Problems]

 The present invention focuses on the problems of the conventional example, and has a transparent electrode formed on an insulating and transparent base film, and a transparent electrode formed on the transparent electrode so as to have first and second lead portions. A light emitting layer and an insulating layer that are sequentially stacked, a first electrode terminal that is stacked on the insulating layer with a first lead portion, a back electrode that is integral with the first electrode terminal, and a second lead portion that is formed on the insulating layer. And a second electrode terminal electrically connected to the transparent electrode and electrically separated from the back electrode, and at least a part of the first and second electrode terminals exposed on the back electrode. And a moisture-proof layer.

[0008]

[Action]

 The first and second electrode terminals, which are the power supply parts of the EL element, are printed so that there is no step on the back electrode side, so the light emitting surface can be fully utilized, and the commercial and design characteristics are improved. In addition, it is easy to connect to the electrode part of the external drive circuit and stable power supply is possible, thus improving the quality. Moreover, since the first and second electrode terminals and the moisture-proof layer can be formed by printing, the EL element becomes a thin type, the manufacturing process is simplified, and the productivity is improved.

[0009]

【Example】

 Hereinafter, the present invention will be described based on the embodiments shown in FIGS. 1 and 2, but the same or corresponding portions as those of the conventional example will be denoted by the same reference numerals and detailed description thereof will be omitted.

On the base film 15 made of PET, polyimide, etc., which is insulative and transparent and has a thickness of 50 to 200 μm, indium oxide is formed as a conductive fine powder having a visible light transmitting property to form a coating film. On the transparent electrode 16 formed by printing conductive paste dispersed in cyanoethyl cellulose as a resin having a thickness of 4 to 20 μm, the center on one end side is cut out to form the first lead portions 3a and 2a. The light emitting layer 3 and the insulating layer 2 having the second lead portions 3b and 2b respectively formed thereon are printed in a thickness of 20 to 50 .mu.m and sequentially laminated.

Then, the insulating layer 2 is laminated at a position corresponding to the first extending portion 2a of the insulating layer 2 at a position excluding the second extending portion 2b, and a conductive material such as nickel, carbon, silver or copper paste is formed. A first electrode terminal 1a made of a material and a back electrode 1 integrated with the first electrode terminal 1a are formed by printing with a thickness of 5 to 15 μm. On the other hand, on the second lead-out portion 2b of the insulating layer 2, the transparent electrode 16 is electrically connected, and the back electrode 1 and the first electrode terminal 1a of the back electrode 1 are electrically separated from each other. The second electrode terminal 16a, which is made of the same material as the one electrode terminal 1a and serves as an auxiliary electrode of the transparent electrode 16, is formed by printing with a thickness of 5 to 15 μm to form the light emitting portion 17 (the first electrode terminal 1a and this). The integrated back electrode 1 and second electrode terminal 16a are printed and formed in the same process).

Then, a protective layer made of epoxy resin or the like having a thickness of 5 to 20 μm is formed so as to expose at least a part of the first and second electrode terminals 1a and 16a on the light emitting part 17 (back electrode 1). By forming the wet layer 18 by printing, a thin flat plate EL element 14 that does not require the lead pins 9 and 10 as shown in FIGS. 3 and 4 is formed, and the first and second electrodes exposed from the moisture-proof layer 18 are formed. By applying a predetermined voltage to the terminals 1a and 16a from an external drive circuit (not shown), the light emitting layer 3 between the transparent electrode 16 and the back electrode 1 emits surface light.

With such a configuration, the first and second electrode terminals 1a and 16a, which are the power feeding portions of the EL element 14, are provided on the back electrode 1 side and electrically connected to the electrode portion (electrode lead) of the external drive circuit (not shown). As a result, the light emitting surface can be fully utilized and the product characteristics and design characteristics are improved.

Further, since most parts of the EL element 14 are formed by printing, not only the manufacturing process is simplified and the productivity is improved, but also the thickness of the EL element 14 is very thin, about 100 to 360 μm. It can be formed, for example, it can be used as a backlight in precision equipment such as a wristwatch, and since the first and second electrode terminals 1a and 16a are formed at the same height, it can be formed from an external drive circuit (not shown). The state of contact with the electrode part of is good and stable power supply is possible.

Although the moisture-proof layer 18 is formed by printing on the light emitting portion 17, the light emitting portion 17 may be surrounded by a pair of sealing films 12 and 13 as shown in FIGS.

Further, instead of the transparent electrode 16, a transparent sheet made of a polyester film or the like as shown in the conventional example is formed on one surface with an electrode material made of tin oxide, indium oxide or the like by vapor deposition or a sputtering method. An electrode film may be used as the transparent electrode 4.

If necessary, a current collecting band 5 as shown in FIG. 3 may be formed on the transparent electrode 16.

[0018]

[Effect of device]

 The present invention provides a transparent electrode formed on an insulating and transparent base film, a light emitting layer and an insulating layer sequentially laminated on the transparent electrode so as to have first and second lead portions, and A first electrode terminal laminated on the insulating layer and a first electrode terminal and a back electrode integrated with the first electrode terminal, and a second electrode portion formed on the insulating layer, laminated on the insulating layer and electrically connected to the transparent electrode, and A second electrode terminal electrically separated from the back electrode, and a moisture-proof layer formed on the back electrode so that at least a part of the first and second electrode terminals are exposed. Since the lead pin for applying the predetermined voltage is not required and most parts of the EL element can be formed by printing, the manufacturing process is simplified, and the first and second electrodes serving as the power feeding part of the EL element on the back electrode side. The light emitting surface is sufficient to form the terminals. It is possible to use, merchantability, contributes to the improvement of the design.

Further, since the EL element can be formed very thin by the printing process, it can be used as a backlight in precision equipment such as a wristwatch, and the first and second electrode terminals are formed at the same height. Therefore, the state of contact with the electrode lead from the drive circuit becomes good, and a stable power supply can be provided, which contributes to the improvement of quality.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of the embodiment.

FIG. 3 is a sectional view of a main part showing a conventional example.

FIG. 4 is a rear view of the above conventional example.

[Explanation of symbols]

 1 Back Electrode 1a First Electrode Terminal 2 Insulating Layer 3 Light Emitting Layer 2a, 3a First Lead Out Part 2b, 3b Second Lead Out Part 15 Base Film 16 Transparent Electrode 16a Second Electrode Terminal 17 Light Emitting Part 18 Moisture Barrier Layer

Claims (1)

[Scope of utility model registration request] 1. A transparent electrode formed on an insulating and transparent base film, a light emitting layer and an insulating layer sequentially laminated on the transparent electrode so as to have first and second lead portions, and A first electrode terminal laminated on the insulating layer and the first electrode terminal and a back electrode integrated with the first electrode terminal; and a second electrode portion laminated on the insulating layer and electrically connected to the transparent electrode. A second electrode terminal electrically separated from the back electrode,
A moisture-proof layer formed on the back electrode so that at least a part of the first and second electrode terminals is exposed.