JP2000260563A - Terminal part structure for electroluminescence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable terminal part structure for electroluminescence with a metallic terminal assembly, prevented from being peeled off from a fetch electrode when a temperature change. an external force. or the like is applied thereto. SOLUTION: This terminal part structure for electroluminescence is made up by providing a extraction electrode 12a for voltage impression on a transparent electrode 3 and on a back electrode 6 of the electroluminescence 20 made up of the transparent electrode 3, an illuminant layer 4, a dielectric layer 5, and the back electrode 6, provided on a transparent substrate 2, and fixing a metallic terminal plate 23 to the extraction electrode 12a. Lock nails 25 are provided on the metallic terminal plate 23, and the metallic terminal plate 23 is fixed by crimping the lock nails 25 on the transparent substrate 2 of the electroluminescence 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure for electroluminescence (hereinafter referred to as EL).

[0002]

2. Description of the Related Art At present, in various electronic devices such as a portable timepiece and a portable telephone using a liquid crystal display cell, there is a device using an EL as a backlight for night illumination. As a basic structure of EL when used as a backlight, for example, as shown in FIG. 4, a transparent electrode 3 (ITO electrode) is formed on the lower surface of a transparent substrate 2 such as a plastic film.
The light emitting layer 4, the dielectric layer 5, and the back electrode 6 are sequentially laminated thereunder, and the whole is covered with an insulating layer 7.

In the EL 1 having such a configuration, the light-emitting layer 4 emits light when a predetermined AC voltage is applied between the transparent electrode 3 and the back electrode 6. Conventionally, the terminal section 10 for voltage application provided on the electrode 6 has a structure as shown in FIGS. 4 and 5. 4 and 5 show the structure of the terminal portion 10 on the transparent electrode 3 side. A terminal piece 11 is protruded from a part of the transparent electrode 3 and a silver paste or a carbon paste Thus, a terminal portion structure is formed in which a take-out electrode 12 for applying a voltage is formed by applying the same and a metal terminal plate 14 is bonded and fixed to the take-out electrode 12 via a conductive adhesive 13. Although not shown, the terminal portion of the back electrode 6 has the same structure, and a metal terminal plate is provided in the vicinity thereof so as not to contact the metal terminal plate 14 on the transparent electrode 3 side. Conductive wires are connected to these metal terminal plates 14 and connected to an external power supply such as an inverter. When a predetermined AC voltage is applied to the transparent electrode 3 and the back electrode 6 through both the metal terminal plates 14, the light emitting layer 4 emits light, and the liquid crystal display cell can be illuminated from the back side.

[0004]

However, in the terminal structure of the conventional EL1, the metal terminal plate 1 is connected to the extraction electrode 12 extending from the transparent electrode 3 and a part of the back electrode 6.
4 is fixed only via the conductive adhesive 13, the metal terminal plate 14 can be used when repeated expansion and contraction due to temperature change or when a strong impact is applied to the bonded portion.
However, there is a problem that the electrode may be peeled off from the extraction electrode 12 and lack stability.

Accordingly, an object of the present invention is to provide a stable terminal portion structure in which a metal terminal plate does not peel off from an extraction electrode when a temperature change or an external force is applied.

[0006]

In order to solve the above problems, an EL terminal structure according to claim 1 of the present invention comprises a transparent electrode, a luminescent layer, a dielectric layer, and a back electrode on a transparent substrate. An extraction electrode for applying voltage is provided on the transparent electrode and the back electrode of the electroluminescence that are provided, and a metal terminal plate is fixed to the extraction electrode. The present invention is characterized in that a metal claw is fixed by providing a claw and caulking the locking claw to a part of the electroluminescence.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a terminal structure according to an embodiment of the present invention. FIG.
1 to 3 show a first embodiment of a terminal portion structure according to the present invention. FIG. 1 is a side sectional view of an EL showing a terminal portion structure on a transparent electrode side and a back electrode side. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 showing the structure of the terminal portion on the transparent electrode side. FIG. 3 is a perspective view in which the terminal portion structure on the transparent electrode side is three-dimensionally enlarged. Note that the entire structure of the EL 20 in this embodiment has the same configuration as that of the conventional EL device described with reference to FIG.

As shown in FIGS. 1 to 3, on one side of the EL 20, terminals 21 and 22 for applying voltages to the transparent electrode 3 and the back electrode 6 are provided, respectively. These terminal portions 21 and 22 include terminal pieces 11 a and 11 b protruding from a part of each transparent electrode 3 and back electrode 6,
Extraction electrodes 12a, 12b for applying a voltage formed by applying a silver paste, a carbon paste, or the like to a, 11b.
And metal terminal plates 23 and 24 caulked and fixed to the extraction electrodes 12a and 12b.

The metal terminal plates 23 and 24 are made of a thin metal having good conductivity such as copper, and their surfaces are subjected to a surface treatment such as gold plating or nickel plating in consideration of a rust prevention effect and a conductive effect. Have been. Also, as shown in FIGS. 1 and 3, the width of each metal terminal plate 23, 24 is
a, 11b are slightly narrower, and a total of four locking claws 25 are provided upright on each side edge, two on each side. These locking claws 25 are punched and cut at the same time when the metal terminal plates 23 and 24 are press-formed. The tip of the locking claw 25 is sharply pointed. The number and shape of the locking claws 25, the tip shape, the height and the width, and the like can be appropriately changed in design.

Next, a method of fixing the metal terminal plates 23, 24 having the above-described structure to the terminal pieces 11a, 11b projecting from the transparent electrode 3 and the back electrode 6 will be described. As described above, first, the terminal pieces 11 of the transparent electrode 3 and the back electrode 6 are formed.
Extraction electrodes 12a, 12b made of silver paste, carbon paste, or the like are formed on a, 11b, and the metal terminal plates 23, 24 are pressed directly on the extraction electrodes 12a, 12b. In this case, there is no need to apply a conductive adhesive. When the metal terminal plates 23 and 24 are pressed, the locking claws 25 are pulled out of the extraction electrodes 12 a and 12 b and the terminal strip 11.
a, 11b and the transparent substrate 2 are sequentially pierced and
Is projected from the surface of the transparent substrate 2. Next, with the metal terminal plates 23 and 24 pressed against the extraction electrodes 12a and 12b, the tips of the locking claws 25 protruding from the surface of the transparent base 2 are bent inward at an acute angle, and the tips are bent. The metal terminal plates 23 and 25 can be fixed by caulking

The metal terminal plate 2 thus caulked
The metal terminals 3 and 24 are firmly fixed to the transparent substrate 2, and the metal terminal plates 23 and 24 do not peel off against the expansion and contraction due to a temperature change and the impact due to an external force. , 12b.

In the above embodiment, the case where the tip of the locking claw 25 is bent and crimped to the transparent base 2 has been described. However, the tip of the locking claw 25 is crimped and fixed to the transparent base 2 by crushing. You can also. In the above-described embodiment, the width of the metal terminal plates 23 and 24 is made smaller than the width of each of the terminal pieces 11 a and 11 b of the transparent electrode 3 and the back electrode 6. The case of piercing with the metal terminal plate 2 was described.
The lateral widths of the terminal pieces 11a and 11b may be set to be the same as those of the terminal pieces 11a and 11b, and the locking claw 25 may graze the side edges of the terminal pieces 11a and 11b. Further, in the above embodiment, the case where the four locking claws 25 are provided on the metal terminal plates 23 and 24 has been described. However, if there are a total of two locking claws 25, one on each of the right and left sides, the caulking is performed. It can have an effect. Further, in the above-described embodiment, the case where the locking claw 25 is caulked to the transparent base 2 has been described. However, the object to be caulked is not limited to the transparent base 2.

[0013]

As described above, the EL according to the present invention is provided.
According to the terminal part structure of (1), a locking claw is provided on the metal terminal plate, and the locking claw is caulked to a part of the EL. There is an effect that the metal terminal plate is not peeled off even by an impact due to an external force, and stable conduction is obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an EL showing a first embodiment of a terminal portion structure according to the present invention.

FIG. 2 is a cross-sectional view of FIG.
It is sectional drawing along the A line.

FIG. 3 is a perspective view in which a terminal structure on a transparent electrode side is three-dimensionally enlarged.

FIG. 4 is a cross-sectional view of an entire EL showing an example of a conventional terminal portion structure.

FIG. 5 is a plan view showing a structure of a terminal portion on a transparent electrode side.

[Explanation of symbols]

 Reference Signs List 2 transparent substrate 3 transparent electrode 4 luminescent layer 5 dielectric layer 6 back electrode 12a extraction electrode for transparent electrode 12b extraction electrode for back electrode 20 EL 21 terminal part of transparent electrode 22 terminal part of rear electrode 23 metal terminal plate of transparent electrode 24 Metal terminal plate for back electrode 25 Locking claw

Claims (1)

[Claims] 1. An electroluminescent transparent electrode and a back electrode each comprising a transparent electrode, a luminescent layer, a dielectric layer, and a back electrode provided on a transparent substrate, and an extraction electrode for applying a voltage is provided. In the terminal portion structure of electroluminescence in which a metal terminal plate is fixed to the metal terminal plate, a locking claw is provided on the metal terminal plate, and the locking claw is fixed to a part of the electroluminescence to fix the metal terminal plate. An electroluminescent terminal structure.