JPH0619197Y2 - Electroluminescent device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electroluminescence element (hereinafter, EL).
(Abbreviated as D), and particularly to a connection structure of lead terminals provided on the counter electrode and the transparent electrode.

[Conventional technology]

In recent years, ELD materials and technologies have advanced, and relatively bright EL
Since D has come to be manufactured, its use is expanding. Among them, the organic dispersion-type ELD has been widely used because of its low cost and high brightness, and thus has attracted much attention.

2 and 3 show an example of a conventional ELD. FIG. 2 is a partially cutaway bottom view of the ELD, and FIG. 3 is a sectional view taken along the line AA of FIG. In these figures, 1
Is a counter electrode made of aluminum foil or the like, 2 is a transparent electrode formed by forming a thin film of mixed oxide of In and Sn on a transparent sheet, and 3 is a light emitting layer made of a powder layer of ZnS-Mn, ZnS-Cu, or the like, These are laminated from the bottom in the order of the counter electrode 1, the light emitting layer 3, and the transparent electrode 2 to form a light emitting portion. Numerals 4 and 5 are lead terminals made of a metal foil such as phosphor bronze, one lead terminal 4 is adhered to the lower surface of the transparent electrode 2 by a conductive adhesive 6 made of silver paste, and the other lead terminal 5 is the same. It is adhered to the lower surface of the counter electrode 1 with a conductive adhesive 6 made of silver paste or the like. Further, the light emitting portion having a laminated structure composed of the counter electrode 1, the light emitting layer 3 and the transparent electrode 2 and a part of the lead terminals 4 and 5 are a pair of upper and lower protective sheets 7 made of a heat-melting film such as polyethylene. The light emitting portion is covered with the protective sheet 7 and the end portions of the protective sheets 7 and 8 are adhered to each other by heat sealing or the like to form a moisture-proof structure.
The lead terminals 4, 5 extending from the protective sheets 7, 8 are soldered to a lead wire (not shown) and electrically connected to an external circuit. By applying a voltage from the outside between the counter electrode 1 and the transparent electrode 2 via the agent 6 or the like, the light emitting layer 3 emits light.

[Problems to be solved by the device]

By the way, in such a conventional ELD, the lead terminals 4 and 5 are electrically and mechanically connected to both electrodes 1 and 2 by using a conductive adhesive 6 made of silver paste or the like. Although the adhesive has excellent electrical characteristics, it is difficult to obtain sufficient mechanical strength. Therefore, there is a possibility that the lead terminals 4 and 5 may have poor contact due to factors such as external stress and heat shock. Further, in the conventional ELD, the connection points between the lead terminals 4 and 5 and the electrodes 1 and 2 are, as shown in FIG. 3, inside the sealing margins 9 and 10 of the protective sheets 7 and 8, that is, the sealing margins. 9,
Since it is formed between 10 and the light emitting portion, there is a problem that the area of the light emitting portion is restricted accordingly and the light emitting region cannot be made large.

The present invention has been made in view of such circumstances of the prior art, and an object thereof is to provide an ELD in which lead terminals can be firmly connected and a wide light emitting region can be obtained.

[Means for Solving the Problems]

In order to achieve the above object, the present invention connects each lead terminal to each lead part of a counter electrode and a transparent electrode through a conductive heat seal material, and seals a protective sheet in an area including this connection part. It is configured to form a stop.

[Action]

That is, the present invention uses a conductive adhesive such as a silver paste by heating under pressure through a conductive heat seal material between each lead portion of the counter electrode and the transparent electrode and each lead terminal. Compared to the case, the lead terminals can be connected more easily and firmly, and since the sealing margin of the protective sheet is formed in the area including this connecting point, the connecting point is sandwiched by the protective sheet. The mechanical strength is further improved, and since the light emitting region is located just inside the sealing margin, the light emitting region can be widened.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to FIG.

FIG. 1 is a sectional view of an ELD according to an embodiment of the present invention. In FIG. 1, 11 is a counter electrode, 12 is a transparent electrode,
Reference numeral 13 denotes a light emitting layer made of a fluorescent substance and a derivative, and a laminate of the counter electrode 11, the light emitting layer 13, and the transparent electrode 12 constitutes a light emitting section. Reference numeral 14 denotes a lead pin for external input. The lead pin 14 is electrically connected to a lead portion of the counter electrode 11 via a conductive heat seal material 16 formed by mixing conductive particles such as metal or carbon into thermoplastic oil and fat. And they are mechanically connected. Although not shown, a lead pin for external input is also connected to the lead portion of the transparent electrode 12 via a conductive heat seal material. Reference numeral 15 is a moisture absorption layer made of a material having high moisture absorption efficiency, 17 is a metal composite film which is one protective sheet, and 18 is a transparent resin film which is the other protective sheet.
The metal composite film 17 covering the side is a known one made by laminating a metal foil such as aluminum between resin films such as polyethylene terephthalate, and the transparent resin film 18 covering the transparent electrode 12 side is transparent and moisture-proof. It is made of trifluoroethylene chloride, which has excellent properties. 21,22
Is a hot melt film, and when the lead pins 14 are connected to both electrodes 11 and 12, the lead pins 14 are fixed by these hot melt films 21 and 22. Then, the peripheral edges of the metal composite film 17 and the transparent resin film 18 are tightly joined to each other by heat sealing, and thereby the light emitting portion is hermetically covered to secure the moisture-proof property. Since it is provided in the region including the connection point between the lead pin 14 and the lead pin 14, the sealing margins 19 and 20 and the lead pin connection point overlap each other. The end surface of the sealing margin 19 of the metal composite film 17 is slightly retracted from the exposed portion of the hot melt film 21.

The ELD having the above-described configuration has a sealing allowance 19 so as to sandwich the lead portions of the counter electrode 11 and the transparent electrode 12,
Since 20 is formed, that is, the lead pin connection point is sandwiched by the metal composite film 17 and the transparent resin film 18, this connection point is reinforced and the mechanical strength is increased. Further, since the inside of the sealing margins 19 and 20 immediately becomes the light emitting region, the ratio of the light emitting region to the entire ELD is larger than that of the conventional product, and the ELF has a good space factor.

Further, the ELD has a counter electrode 11 and a transparent electrode 1.
Since the second lead portion and each lead pin 14 are connected by the conductive heat seal material 16, the mechanical strength is superior to the case where a conductive adhesive such as a silver paste is used, and unnecessary portions are formed. Since there is no fear that the conductive heat seal material 16 will flow out to the front, connection work is easy.

Further, in the LED, one end of the hot melt film 21 is made to project a little more than the end face of the sealing margin 19 of the metal composite film 17, so that the metal foil in the metal composite film 17 contacts the lead pins 14. Short-circuit accidents that may occur can be prevented and reliability is high.

In the above embodiment, the lead pin 14 is used as the lead terminal.
However, instead of the lead pin 14, a lead terminal made of a metal foil such as phosphor bronze or a flexible printed board formed by printing a copper foil pattern on a resin film may be used. In this case, the hot melt films 21 and 22 may be omitted.

[Effect of device]

As described above, according to the present invention, the lead terminals can be easily and firmly connected via the conductive heat seal material,
Moreover, since the connection point is sandwiched by the sealing margin of the protective sheet, the mechanical strength is further improved, and since the light emitting area is just inside the sealing margin, the light emitting area can be widened. , Has a remarkable effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electroluminescence device according to an embodiment of the present invention, FIG. 2 is a partially cutaway bottom view of an electroluminescence device according to a conventional example, and FIG. 3 is A of FIG. FIG. 11 ... Counter electrode, 12 ... Transparent electrode, 13 ... Light emitting layer, 14 ... Lead pin (lead terminal), 16 ... Conductive heat seal material, 17 ... Metal composite film (protective sheet), 18 ... Transparent resin film (protective sheet), 1
9, 20 ... Sealing fee.

Claims (1)

[Scope of utility model registration request] 1. A light emitting portion having a light emitting layer interposed between a counter electrode and a transparent electrode is hermetically covered with a protective sheet, and a voltage is applied between the counter electrode and the transparent electrode via a lead terminal for external input. In the electroluminescence element that is adapted to cause the light emitting layer to emit light by applying, while connecting each lead terminal to each lead portion of the counter electrode and the transparent electrode via a conductive heat seal material, An electroluminescent element, characterized in that a sealing margin of the protective sheet is formed in a region including a connection point.