KR20040094916A - Connection structure of electrode terminals in EL device and connection method between electrode terminals and driving power supply - Google Patents

Abstract

PURPOSE: A connection structure and a connection method are provided to reduce processes, and connect electrode terminals and electrodes of power supply by using a small area. CONSTITUTION: A connection structure comprises an upper case(530); an electroluminescence key pad(520) on which a first electrode terminal(521) and a second electrode terminal(522) of the electroluminescence device are formed; a lower case where a first electrode(511) and a second electrode(512) of a power supply are formed on a PCB(510); and an assembly unit for assembling the upper case, key pad, and the lower case. The first electrode terminal and the second electrode terminal directly contact the first electrode and the second electrode of the power supply by the assembly unit such that the first and second electrode terminals are electrically connected to the first and second electrodes of the power supply, respectively.

Description

Connection structure of electrode terminals in EL device and connection method between electrode terminals and driving power supply}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal, and more particularly, to improve reliability and simplify the process, to connect an electrode terminal and an electrode of a driving power source with a small area, and to any part of an EL element for a keypad. The present invention relates to a connection structure of an electrode terminal of an EL device for an environmentally friendly keypad and a connection method with a driving power source.

In general, a portable terminal uses a DC power supply of a battery, and an EL element used as a backlight of the portable terminal is driven by alternating current. Therefore, an inverter for converting the DC power source of the battery into alternating current and providing it to the EL element is used.

1 shows a schematic structure of an EL element used as a backlight for a keypad of a conventional portable terminal.

Referring to FIG. 1, the EL device 100 for a keypad according to the related art has a transparent electrode layer 11 made of ITO formed entirely on a transparent insulating substrate 10 such as PET, and a fluorescence formed on the transparent electrode layer 11. The layer 12, the dielectric layer 13, and the carbon layer 14 are sequentially formed, and the protective layer 15 covers the transparent electrode layer 11, the fluorescent layer 12, the dielectric layer 13, and the carbon layer 14. ) Has a formed structure. The keypad EL element 100 also has two electrode terminals 16 and 18 for connecting two electrodes, namely, the transparent electrode layer 11 and the carbon layer 14, to the electrodes of the driving power source. do.

One of the two electrode terminals 16 and 18 is a front electrode terminal 16 and the other 18 is a rear electrode terminal. Reference numeral 17 is an insulating film for insulating the back electrode terminal 18 and the transparent electrode layer 11 from each other.

The keypad EL element 100 has a transparent electrode 11 and a carbon layer 14 serving as two electrodes of a front electrode and a back electrode, respectively, from a driving power source (not shown in the drawing) to the two electrodes. A predetermined alternating voltage is applied to emit light from the fluorescent layer 12.

2 is a diagram schematically showing a connection relationship between two electrodes of a conventional driving power supply and two electrode terminals of an EL element 20 for a keypad. Referring to Fig. 2, two electrodes 28 and 29 of the driving power supply are connected to the two electrode terminals 21 and 22 of the EL element for the keypad through respective connection terminals 24 and 25, respectively. Connected. That is, the first electrode 28 of the two electrodes 28 and 29 of the driving power supply is connected to the two EL devices for the keypad through the first connecting terminal 24 of the two connecting terminals 24 and 25. Of the two electrode terminals 21 and 22, the second electrode 29 of the driving power source is connected to the first electrode terminal 21, and the second electrode terminal of the EL element for the keypad via the second connecting terminal 25; Is connected to (22). Therefore, since the AC power generated from the driving power is provided from the two electrodes to the two electrode terminals of the EL element for the keypad through the connection terminal, the EL element for the keypad is driven by the AC power applied to the back electrode and the front electrode. Light is emitted from the fluorescent layer.

At this time, the first electrode terminal 21 of the EL element for keypad corresponds to the front electrode terminal 16 connected to the transparent electrode layer 11 as the front electrode in FIG. 1, and the second electrode terminal 22 of the EL element for keypad is used. 1) corresponds to the back electrode terminal 18 connected to the carbon layer 14, which is the back electrode in FIG.

As described above, in order to connect the two electrodes 28, 29 of the driving power supply and the two electrode terminals 21, 22 of the EL element for the keypad, conventionally, two of the EL elements for the keypad are first used. Two terminals 21, 22 and one side of the connection terminals 24, 25, and then the other side of the connection terminals 24, 25 and the two electrodes 28, ( 29). The two electrodes of the conventional driving power supply and one side of the two connection terminals are electrically connected to each other by soldering, and the other side of the connection terminal and the two electrode terminals of the EL element for the keypad are connected through a thermocompression or riveting method. Electrically connected.

Referring to FIGS. 3A to 3C, a method of connecting two electrode terminals of an EL element for a keypad and two connection terminals for providing AC power from a driving power source using a conventional thermocompression method will be described below. . In this case, although not shown in the drawing, an insulating film for insulating the ITO film and the transparent electrode ITO film is formed below the second electrode terminal 32.

First, as shown in FIG. 3A, an anisotropic conductive layer 33 is formed on a transparent insulating substrate 30 on which a first electrode terminal 31 and a second electrode terminal 32 are formed, for example, a PET substrate. The anisotropic conductive layer 33 is formed by printing a small metal conductive ball of about 30㎛ and the ink of the adhesive component, the ink for forming the anisotropic conductive layer 33 is a lower portion of the ink while the adhesive melts during thermal compression The first and second electrode terminals 31 and 32 of the keypad and the first and second electrode terminals 31 and 32 of the EL element for the keypad while breaking the conductive ball under pressure. ) And adhesive thermocompression ink for connecting the first and second connection terminals 34 and 35, respectively. The anisotropic conductive layer 33 is electrically conductive only in the vertical direction, and has an insulating property in the left and right directions.

As shown in FIG. 3B, two connection terminals, that is, the first and second connection terminals 34 and (34), are formed on the first and second electrode terminals 31 and 32 of the substrate 30 on which the anisotropic conductive layer 33 is formed. 35) respectively. The protective film 36 is formed with the first and second electrode terminals 31 and 32 and the first and second connection terminals 34 and 35 of the keypad EL element aligned. The protective layer 36 is formed by attaching a protective tape having an adhesive, and is bonded to the first and second connection terminals 34 and 35 while the adhesive component is melted during thermocompression bonding, and at the same time, the lower anisotropic conductive layer 33 Also adheres to).

As shown in FIG. 3C, the first and second connection terminals 34 and 35 and the first and second electrode terminals 31 and (of the EL element for a keypad) are subjected to a thermocompression process using a hot bar 37. 32). At this time, the hot bar 37 has a rod shape made of metal, and presses while applying heat and pressure to the metal rod to perform a thermocompression bonding process.

Therefore, when the thermocompression bonding process is performed using the hot bar 37, the adhesive component of the anisotropic conductive layer 33 is melted by heat, and the first and second electrode terminals 31, 32, and the first and second electrode terminals of the EL element for keypads are melted by heat. The first and second connection terminals 34, 35 are bonded together. In addition, the protective film 36 is adhered to the first and second connection terminals 34 and 35 by the adhesive component of the protective film 36 and to the lower anisotropic conductive layer 33. At the same time, the conductive balls of the anisotropic conductive layer 33 are broken by the pressure so that the first electrode terminal 31 and the first connection terminal 34 of the keypad EL element are electrically connected, and the second of the keypad EL element The electrode terminal 32 and the second connection terminal 35 are electrically connected.

Referring to Figs. 4A to 4B, a method of connecting the connecting terminal and the electrode terminal of the EL element for the keypad by conventional riveting will be described. Although not shown in the drawing, an ITO film for transparent electrodes and an insulating film for insulating the ITO film are formed under the second electrode terminal 42.

Referring to FIG. 4A, the transparent insulating substrate 40 on which the first and second electrode terminals 41 and 42 are formed is placed on the base substrate 47, and then the first and second connection terminals 44, 45 are aligned with the first and second electrode terminals 41 and 42 of the keypad EL element, respectively. In this case, the first and second connection terminals 44 and 45 include protrusions 45-1 and 46-1.

Referring to FIG. 4B, the first and second connection terminals 44 and 45 are aligned with the first and second electrode terminals 41 and 42. When the pressure is applied toward the base substrate 47 from the 44 and 45 sides, the protrusions 44-1 and 45-2 of the first and second connection terminals 44 and 45 are the first and the second, respectively. It penetrates through the 2nd electrode terminal 41 and 42. FIG. Accordingly, the first connection terminal 44 is electrically connected to the first electrode terminal 41, and the second connection terminal 45 is electrically connected to the second electrode terminal 42. Finally, the first and second electrodes 44 and 45 penetrate the substrate 40 so that the end portions of the protrusions 44-1 and 45-1 are in contact with the base substrate 47. To be fixed.

As described above, by connecting the connecting terminal and the electrode terminal of the EL element for the keypad by thermocompression bonding or riveting, and then connecting the electrode of the driving power supply and the connecting terminal by the soldering method, the electrode of the driving power supply is EL for keypad It is electrically connected to the electrode terminal of the device to provide an AC power source.

The method of connecting the electrode of the conventional driving power source and the electrode terminal of the EL element for the keypad as described above has the following problems.

First, the number of processes is large and complicated, and thus, a lot of process time is required, resulting in a decrease in productivity and a problem in yield reduction.

Second, in the case of the riveting method, moisture penetrates through the hole drilled by the metal terminal, so the EL element for the keypad does not emit light, or in the case of the thermocompression method, the thermocompression-bonded part is dropped due to the temperature generated during soldering. There was a problem in reliability such that contact failure occurred due to reattachment, resulting in a failure of the EL element for keypad to emit light.

Third, in order to prevent the falling of the connecting terminal bonded to the electrode terminal from the external impact, not only a certain adhesive area is required at the connecting terminal but also a predetermined soldering area at the connecting terminal is required to connect the connecting terminal and the electrode. There was a problem.

Fourth, if the electrode terminal is formed inside the EL element for keypad, the other part of the EL element for keypad is also thermo-compressed by the hot bar during thermocompression, thereby making it difficult to damage and soldering. There was a problem that must be formed.

Fifth, the conventional method has a problem in that the manufacturing cost is expensive due to the use of conductive and adhesive thermocompression inks, metal connecting terminals and protective tapes.

Sixth, there is a problem causing environmental pollution because it connects the electrode of the driving terminal and the connecting power using soldering.

Accordingly, the present invention is to solve the problems of the prior art as described above, can simplify the process, improve the reliability, can connect the electrode terminal and the electrode of the driving power supply with a small area, EL for keypad An electrode can be formed in any part of the device, and an object thereof is to provide a connection structure of an electrode terminal of an EL device for an environmentally friendly keypad and a connection method with a driving power source.

1 is a cross-sectional structure diagram of an EL element used as a backlight for a keypad of a conventional portable terminal,

2 is a planar structure diagram for explaining a connection structure between an electrode of a driving power supply and an electrode terminal of an EL element for a keypad in a conventional portable terminal;

3A to 3C are cross-sectional structural views for explaining a method for connecting an electrode of a driving power supply and an electrode terminal of an EL element for a keypad using a conventional thermal compression method;

4A and 4B are cross-sectional structure diagrams for explaining a method for connecting electrodes of a driving power source and electrode terminals of an EL element for a keypad using a conventional riveting method;

5 is a cross-sectional structural view for explaining a method for connecting an electrode of a driving power source and an electrode terminal of an EL element for a keypad using a contact method according to an embodiment of the present invention;

6 is a view showing a cross-sectional structure of an electrode terminal of an EL element for a keypad used in a connection method using a contact method according to an embodiment of the present invention;

7A to 7C are cross-sectional structural views for explaining a method for connecting an electrode of a driving power source and an electrode terminal of an EL element for a keypad using a connector method according to another embodiment of the present invention;

8 is a view showing an example of a cross-sectional structure of an electrode terminal of an EL element for a keypad used in a connection method using a connector method according to another embodiment of the present invention;

9A is a view showing another example of a cross-sectional structure of an electrode terminal of an EL element for a keypad used in a connection method using a connector method according to another embodiment of the present invention;

Figure 9B is a view showing a planar structure of a flexible PCB (FPCB) used in the connection method of Figure 9A,

* Description of the symbols for the main parts of the drawings *

510: PCB substrate 520: EL keypad

530: upper case 513, 523, 533: hole

511, 512: electrode of driving power 600, 800: transparent insulating substrate

521, 522, 611, 612, 811, 812, 911, 912: electrode terminal

621, 622, 821, 823: conductive film 700: connector

710: case 720: metal film

730: groove 740: fixing means

920: FPCB 921, 922: FPCB electrode

In order to achieve the above object, the present invention provides a first and second electrode terminals of an EL element for keypad; An EL element for a keypad including first and second electrodes of a driving power source, wherein the first and second electrode terminals of the EL element for keypad are directly contacted with and electrically connected to the first and second electrodes of the driving power, respectively. And a connection structure of the driving power source.

In addition, the present invention and the upper case; An EL keypad on which first and second electrode terminals of the EL element for keypad are formed; A lower case corresponding to the first and second electrode terminals, wherein first and second electrodes of a driving power source are formed on a PCB substrate; Assembling means for assembling the upper case, the EL keypad and the lower case, wherein the first and second electrode terminals of the EL element for the keypad and the first and second electrodes of the driving power supply are respectively provided by the assembling means. It is characterized in that it provides a connection structure of the EL element for the keypad and the driving power source which are directly contacted and electrically connected to each other.

A forward conductive film is formed in each of the first and second electrode terminals of the keypad EL element in all directions or the first and second electrode terminals of the cap EL element and the first and second of the driving power source. A forward conductive film may be inserted between the two electrodes, respectively. The forward conductive film enhances the adhesion between the first and second electrode terminals of the keypad EL element and the first and second electrodes of the driving power source. At the same time electrically connected, the forward conductive film has a thin film layer on which the forward conductive ink is printed, forward conductive tape, forward conductive rubber, mixed type of forward conductive tape and forward conductive rubber, or forward property It has a mixed form of a conductive ink, a front conductive tape, and a front conductive rubber, and the front conductive film has a thickness larger than a gap between upper and lower cases.

An anisotropic conductive film is formed on the first and second electrode terminals of the keypad EL element only in the up and down direction and insulated in the left and right directions, or the first and second electrode terminals of the keypad EL element are formed. An anisotropic conductive film may be inserted between the first and second electrodes of the driving power source, respectively. The anisotropic conductive film strengthens the adhesion between the first and second electrode terminals of the keypad EL element and the first and second electrodes of the driving power source, and electrically connects the anisotropic conductive film. It has a printed thin film layer, anisotropic conductive tape, anisotropic conductive rubber, a mixture of anisotropic conductive tape and anisotropic conductive rubber, or a mixture of anisotropic conductive ink, anisotropic conductive tape and anisotropic conductive rubber, wherein the anisotropic conductive film is It has a thickness larger than the gap between the lower cases.

In addition, the present invention comprises the steps of preparing a lower case to which the PCB substrate on which the first and second electrodes of the driving power supply are formed; Aligning the first and second electrode terminals of the EL element for the EL keypad with the first and second electrodes of the lower case, respectively; Aligning the first and second protrusions of the upper case with the first and second electrode terminals of the EL element for keypad, respectively; By fixing the lower case, the EL keypad and the upper case to be aligned, the first and second electrodes of the PCB board and the first and second electrode terminals of the keypad are contacted by the protrusions, thereby providing the first and second driving powers. A method of connecting a keypad EL element and a driving power source that electrically connects the first electrode and the second electrode terminal of the two electrode and the EL element for keypad is provided.

Also, the present invention provides a display device comprising: first and second electrode terminals of an EL element for keypad; And a connector connected to the first and second electrodes of the driving power source, wherein the first and second electrode terminals of the EL element for keypad are inserted into the connector to drive the first and second electrode terminals of the EL element for keypad. It is characterized in that it provides a connection structure of the EL element for the keypad and the driving power supply electrically connected to the first and second electrodes of the power supply.

Also, the present invention provides a display device comprising: first and second electrode terminals of an EL element for keypad; A groove formed in the inside of the case, a metal film formed in the groove and connected to the first and second electrodes of the driving power source, and a connector having fixing means. First and second electrode terminals are inserted, and are fixed by the fixing means, the first and second electrode terminals of the EL element for the keypad is electrically connected to the first and second electrodes of the driving power source to each other And a connection structure of the driving power source.

In addition, the present invention comprises the steps of preparing a connector having a groove formed on the inside of the case, a metal film formed in the groove connected to the first and second electrodes of the driving power source, and the fixing means; Opening the fixing means of the connector; Forming a forward conductive film or an anisotropic conductive film on the first and second electrode terminals of the keypad EL element, respectively; Inserting first and second electrode terminals of an EL element for keypad having the forward conductive film or the anisotropic conductive film into the groove of the connector, respectively; Covering the fixing means and electrically connecting the first and second electrode terminals of the EL element for the keypad with the first and second electrodes of the driving power. It is characterized by providing.

In addition, the present invention comprises the steps of preparing a connector having a groove formed on the inside of the case, a metal film formed in the groove connected to the first and second electrodes of the driving power source, and the fixing means; Opening the fixing means of the connector; Forming FPCB electrodes on the first and second electrode terminals of the EL element, respectively; Inserting first and second electrode terminals of the keypad EL element on which the FPCB electrode is formed into the grooves of the connector, respectively; Covering the fixing means and electrically connecting the first and second electrode terminals of the EL element for the keypad with the first and second electrodes of the driving power. It is characterized by providing.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 5 is a view for explaining a method for electrically connecting an electrode of a driving power source and an electrode terminal of an EL device for a keypad using a contact method according to an embodiment of the present invention. It simplifies the shape of the EL keypad interposed therebetween.

Referring to FIG. 5, two electrodes of a driving power source formed on one of upper and lower cases of a portable terminal, for example, a PCB substrate 510 attached to a lower case, that is, first and second electrodes 511 and ( 512 is aligned with the two electrode terminals of the EL element formed on the EL keypad 520, that is, the first electrode terminal 521 connected to the front electrode and the second electrode terminal 522 connected to the back electrode, respectively.

First and second electrode terminals 521 and 522 of the EL element in which the first and second electrodes 511 and 512 of the driving power source of the PCB substrate 510 of the lower case are formed on the EL keypad 520. The protrusions 531 and 532 of the upper case 530 are aligned with the first and second electrode terminals 521 and 522 of the EL element formed on the EL keypad 520, respectively, in the state aligned with each other.

As described above, in the state where the PCB board 510 of the lower case, the EL keypad 520 and the upper case 530 are aligned, respectively, the hole 513 and the EL keypad of the PCB substrate 510 of the lower case ( A screw (not shown in the figure) is inserted into the hole 523 of the 523 and the hole 533 of the upper case 530, and assembled.

When the upper and lower cases are assembled using screws so as to be in close contact with each other, the first and second electrode terminals 521 of the EL element formed on the EL keypad 520 by the protrusions 531 and 532 of the upper case 530. ) And 522 and the first and second electrodes 511 and 512 of the driving power source of the lower case 530 are brought into close contact with each other, and the first and second elements of the EL element formed on the EL keypad 520. The front conductive films (621 and 622 in FIG. 6) formed on the second electrode terminals 521 and 522 are further closely contacted and electrically connected to each other.

In the embodiment, the first and second electrode terminals of the EL element for keypads are directly contacted and electrically connected to the first and second electrodes of the driving power source when the upper and lower cases are assembled using screws. The present invention is not limited thereto, and the first and second electrode terminals of the EL device for keypads may be directly contacted and electrically connected to the first and second electrodes of the driving power supply, respectively, in various ways. In addition, the upper case 530 does not have to include the protrusions 531 and 532.

FIG. 6 shows a cross-sectional structure of an EL element of the EL keypad 520 according to the embodiment of the present invention, and is shown as being limited to two electrode terminals. As shown in FIG. 2, the EL device for keypad of the EL keypad according to the embodiment of the present invention is a transparent electrode layer, a fluorescent layer, a dielectric layer, and a carbon layer, which is a front electrode, on a transparent insulating substrate 600 such as PET. This was formed sequentially, and the transparent electrode layer, the fluorescent layer, the dielectric layer, and the carbon layer had a structure covered by the protective layer. However, the cross-sectional structure of the two electrode terminals has the structure as shown in FIG.

Referring to FIG. 6, a first electrode terminal 611 connected to the front electrode and a second electrode terminal 612 connected to the back terminal are formed on a transparent insulating substrate 600 such as polyethylene terephthalate (PET). The forward conductive films 621 and 622 having a predetermined thickness are formed on the first electrode terminal 611 and the second electrode terminal 612, respectively. Although not shown in the drawing, an ITO film for transparent electrodes and an insulating film for insulating the ITO film are formed under the second electrode terminal 612.

The front conductive films 621 and 622 are the first and second electrode terminals 521 and 522 of the EL element formed on the EL keypad 520 when the upper and lower cases are assembled later (611 in FIG. 6). 612 and the first and second electrodes 511 and 512 of the driving power source to increase the degree of adhesion, and at the same time the first and second electrode terminals 521, 522 and the first and second It serves to electrically connect the second electrodes 511 and 512.

The forward conductive films 621 and 622 may be formed by printing forward conductive ink, or may be attached to the forward conductive tape or the forward conductive rubber, or the forward conductive rubber and the forward conductive tape are mixed. It is formed by adhering in a mixed form of the forward conductive ink, the forward conductive tape and the forward conductive rubber. Further, instead of the method of directly printing or attaching the front conductive film to the electrode terminal of the keypad EL element, it is manufactured to have a certain form, for example, a film form, separately from the electrode terminal, and thus, the EL in the bonding process of FIG. 5. It is inserted between the electrode terminals 521 and 522 of the keypad 520 and the electrodes 511 and 512 of the driving power source. In this state, the upper and lower cases 510 and 530 are bonded to each other. . In this case, the thicknesses of the front conductive films 621 and 622 are preferably larger than the distance between them in the state where the upper and lower cases are aligned.

Instead of the front conductive films 621 and 622, an anisotropic conductive film may be formed on the first and second electrode terminals 611 and 612 of the keypad EL element. In this case, the front conductive film is electrically conductive in all directions, whereas the anisotropic conductive film is electrically conductive in the vertical direction and insulated in the left and right directions.

The anisotropic conductive film is a thin film layer formed by printing an anisotropic conductive ink, or is attached in a mixed form of anisotropic conductive tape, anisotropic conductive rubber, anisotropic conductive tape and anisotropic conductive rubber, or a mixture of anisotropic conductive ink, anisotropic conductive rubber and anisotropic conductive tape. To form. Instead of the method of directly printing or attaching an anisotropic conductive film to an electrode terminal of the keypad EL device, the EL keypad is manufactured to have a predetermined shape, for example, a film form, separately from the electrode terminal. It is inserted between the electrode terminals 521 and 522 of 520 and the electrodes 511 and 512 of the driving power source, and in this state, the upper and lower cases 510 and 530 are bonded together. In this case, the film-form anisotropic conductive film has a predetermined thickness like the conductive films 621 and 622.

7A to 7C are views for explaining a method of connecting an electrode of a driving power source and an electrode terminal of an EL element for a keypad by using a connector method according to another embodiment of the present invention.

Referring to FIG. 7A, the connector 700 includes a case 710, a metal film 720 to which an electrode of a driving power source (not shown) connected to the case 710 is connected, and an electrode of an EL element for a keypad. A groove 730 into which the terminal is to be inserted, and fixing means 740 for fixing the electrode terminal of the keypad EL element.

In the state in which the fixing means 740 of the connector 700 having the structure as described above is opened, inserting the electrode terminal 751 of the EL element for keypad into the groove 730 as shown in FIG. The forward conductive film 752 formed on the terminal 751 is in contact with the metal film 720 connected to the electrode of the driving power source.

Next, as shown in FIG. 7C, when the fixing means 740 is closed, the electrode terminal 751 of the EL element for keypad is fixed to the groove 730 in the connector 700, so that the electrode terminal 751 of the keypad EL element is electrically conductive. Since the film 752 comes into close contact with the metal film 720 connected to the electrode of the driving power source, the electrode terminal 751 of the keypad EL element is electrically connected to the electrode of the driving power source.

7A to 7C illustrate that only one electrode terminal of the keypad EL element is inserted into one groove so that one electrode terminal of the keypad EL element is connected to one electrode of the driving power source. There are two grooves formed therein so that the electrode terminals of the two keypad EL elements are connected to the two electrodes of the driving power source.

Fig. 8 shows an example of a cross-sectional structure of an EL element for a keypad in a connector type connection structure of an electrode of a driving power source and an electrode terminal of an EL element for a keypad according to another embodiment of the present invention. The cross-sectional structure of the EL element for keypad of FIG. 8 is shown as limited to two electrode terminals as shown in FIG. Referring to FIG. 8, a first electrode terminal 811 connected to the front electrode of the EL element for keypad and a second electrode terminal 812 connected to the back electrode are formed on the transparent insulating substrate 800. Forward conductive films 821 and 822 are formed on the first and second electrode terminals 811 and 812, respectively. In this case, the front conductive films 821 and 822 correspond to the front conductive films 752 of FIG. 7.

The forward conductive films 821 and 822 may be thin film layers formed by printing forward conductive ink, or may be formed by attaching forward conductive tape or front conductive rubber as in the embodiment of FIG. It is formed by adhering in the form of a mixed conductive tape and a front conductive rubber. Further, instead of the method of directly printing or attaching the forward conductive film to the electrode terminal of the keypad EL device, the EL device for keypad of FIG. 7C is manufactured to have a predetermined shape, for example, a film form, separately from the electrode terminal. Electrode terminal 751 is in close contact with the metal film 720 connected to the electrode of the driving power source through the forward conductive film 752.

6, anisotropic conductive films are formed on the first and second electrode terminals 811 and 812 of the keypad EL element instead of the front conductive films 821 and 822. You may. The anisotropic conductive film is a thin film layer formed by printing an anisotropic conductive ink, or is attached in a mixed form of anisotropic conductive tape, anisotropic conductive rubber, anisotropic conductive tape and anisotropic conductive rubber, or a mixture of anisotropic conductive ink, anisotropic conductive rubber and anisotropic conductive tape. To form. Further, instead of the method of directly printing or attaching an anisotropic conductive film to the electrode terminal of the keypad EL element, the anisotropic conductive film is manufactured to have a certain shape, for example, a film form separately from the electrode terminal, so that the keypad EL element of FIG. The electrode terminal 751 is brought into close contact with the metal film 720 connected to the electrode of the driving power source through the anisotropic conductive film 752. At this time, the anisotropic conductive film in the form of a separate film has a constant thickness, such as the front conductive film (821, 822).

FIG. 9A illustrates another example of a cross-sectional structure of an EL element for a keypad in a connector type connection structure between an electrode of a driving power source and an electrode terminal of an EL element for a keypad according to another embodiment of the present invention. As shown in the drawing, only two electrode terminals are shown. FIG. 9B illustrates a planar structure of a flexible printed circuit board (FPCB) used as a conductive film formed on an electrode terminal of an EL element for a keypad.

Referring to FIG. 9A, a first electrode terminal 911 connected to a front electrode of an EL element for a keypad and a second electrode terminal 912 connected to a back electrode are formed on an insulating substrate 900. And electrodes 921 and 922 of the FPCB 920 are connected to the second electrode terminals 911 and 912 as a conductive film (corresponding to the conductive film 752 of FIG. 7). At this time, the conductive adhesive 930 is printed on the first and second electrode terminals 911 and 912 of the EL element, and the first and second electrode terminals 911 and 912 and the FPCB 920 are printed. Electrode terminals 921 and 922 are aligned and then thermally compressed to form a conductive film. The conductive adhesive 930 is formed by printing anisotropic conductive and thermocompression ink.

Since the FPCB 920 has a structure in which the conductive electrodes 921 and 922 are separated from each other by the insulating portion 923, as shown in FIG. 9B, the FPCB 920 is connected to the electrode terminals 911 and 912 of the EL element for keypad. The electrodes 921 and 922 are connected to each other to act as the conductive film 752 of FIG.

The connector according to another embodiment of the present invention can be used connectors of various structures in addition to the structure shown in FIG.

According to the embodiment of the present invention as described above, the method of connecting the electrode of the driving power supply and the electrode terminal of the EL element for the keypad has the following effects.

First, the present invention excludes a process for forming a separate connection terminal for connecting the electrode of the driving power supply and the electrode terminal of the EL element for the keypad, and eliminates the thermocompression process and the soldering process, so that the number of processes is small and the process is small. It is simple, and thus the process time is considerably shortened, there is an advantage that can reduce the manufacturing cost. In addition, since it does not use lead that causes environmental problems, there is an advantage that can be carried out environmentally friendly process.

Secondly, since the electrode of the driving power source and the electrode terminal of the EL element for the keypad are directly contacted and electrically connected, reliability failures such as moisture penetration or poor adhesion by soldering in the riveting method are prevented.

Third, the electrode terminal and the electrode are prevented from falling off from the external impact, so that a certain bonding area is not required, so that the electrode can be connected to the electrode with a small area and the electrode is formed on any part of the EL element for the keypad. There is an advantage to this.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

Claims (26)

First and second electrode terminals of the EL element for keypad; First and second electrodes of the driving power source, And the first and second electrode terminals of the keypad EL element are in direct contact with and electrically connected to the first and second electrodes of the driving power source, respectively. A front conductive film or an anisotropic conductive film is provided between the first and second electrode terminals of the keypad EL element and the first and second electrodes of the driving power supply. The film is connected to the keypad EL element and the driving power source, characterized in that it strengthens the adhesion between the first and second electrode terminals of the EL element for keypad and the first and second electrodes of the driving power source and electrically connects them. rescue. The method of claim 2, wherein the forward conductive film is formed or inserted into the first and second terminals, the thin film layer on which the conductive ink is printed, attach or insert the front conductive tape or the front conductive rubber, or the front conductive A connecting structure of an EL element for a keypad and a driving power supply, which is attached or inserted in a mixed form of a tape and a front conductive rubber or in a mixed form of a front conductive ink and a front conductive tape and a front conductive rubber. The method of claim 2, wherein the anisotropic conductive film is formed or inserted into the first and second electrode terminals, the thin film layer on which the anisotropic conductive ink is printed, or the anisotropic conductive tape or anisotropic conductive rubber is attached or inserted, A connecting structure of an EL element for a keypad and a driving power supply, which is attached or inserted in a mixed form of anisotropic conductive tape or in a mixed form of anisotropic conductive ink, anisotropic conductive tape and anisotropic conductive rubber. An upper case; An EL keypad on which first and second electrode terminals of the EL element for keypad are formed; A lower case corresponding to the first and second electrode terminals, wherein first and second electrodes of a driving power source are formed on a PCB substrate; An assembly means for assembling the upper case, the keypad, and the lower case; The first and second electrode terminals of the EL element for the keypad and the first and second electrodes of the driving power supply are respectively directly contacted by the assembling means and electrically connected to each other. Connection structure. 6. A forward conductive film or an anisotropic conductive film is provided between the first and second electrode terminals of the keypad EL element and the first and second electrodes of the driving power source. A connection structure between a keypad EL element and a driving power source, characterized in that the first and second electrode terminals of the keypad EL element and the first and second electrodes of the driving power source are strengthened and electrically connected. . The method of claim 6, wherein the forward conductive film is formed or inserted into the first and second electrode terminal, the thin film layer printed with a conductive ink, attached or inserted a front conductive tape or a front conductive rubber, or forward A connecting structure of an EL element for a keypad and a driving power supply, which is attached or inserted in a mixed form of a conductive tape and a front conductive rubber or in a mixed form of a front conductive ink and a front conductive tape. The method of claim 6, wherein the anisotropic conductive film is formed or inserted into the first and second electrode terminals, a thin film layer printed with anisotropic conductive ink, or attached or inserted an anisotropic conductive tape or anisotropic conductive rubber, or an anisotropic conductive rubber and A connecting structure of an EL element for a keypad and a driving power supply, which is attached or inserted in a mixed form of anisotropic conductive tape or in a mixed form of anisotropic conductive ink, anisotropic conductive tape and anisotropic conductive rubber. The keypad structure of claim 6, wherein the front conductive film or the anisotropic conductive film has a thickness greater than a gap between upper and lower cases. Preparing a lower case to which a PCB substrate on which first and second electrodes of a driving power supply are formed is attached; Determining first and second electrode terminals of the EL element formed on the EL keypad on the first and second electrodes of the lower case, respectively; Aligning the upper case with each of the first and second electrode terminals formed on the EL keypad; By fixing the lower case, the EL keypad and the upper case aligned, the first and second electrodes of the PCB substrate are brought into contact with the first and second electrode terminals of the EL element formed on the EL keypad, thereby providing a first driving power source. And a method for connecting the EL element for the keypad and the driving power source, which electrically connects the second electrode to the first and second electrode terminals of the keypad EL element. 12. The anisotropic conductive film or anisotropic conductive film according to claim 10, wherein a front conductive film or an anisotropic conductive film is provided between the first and second electrode terminals of the keypad EL element and the first and second electrodes of the driving power supply. The film is connected to the keypad EL element and the driving power source, characterized in that it strengthens the adhesion between the first and second electrode terminals of the EL element for keypad and the first and second electrodes of the driving power source and electrically connects them. Way. The method of claim 11, wherein the forward conductive film is formed or inserted into the first and second electrode terminal, the thin film layer on which the conductive ink is printed, or to attach or insert the front conductive tape or the front conductive rubber, A method of connecting an EL element for a keypad and a driving power supply, characterized in that it is attached or inserted in a mixed form of a conductive tape and a front conductive rubber or in a mixed form of a front conductive ink and a front conductive tape. The method of claim 11, wherein the anisotropic conductive film is formed or inserted into the first and second electrode terminals, a thin film layer printed with anisotropic conductive ink, or attached or inserted an anisotropic conductive tape or anisotropic conductive rubber, or an anisotropic conductive rubber and A method of connecting an EL element for a keypad and a drive power supply, wherein the keypad is attached or inserted in a mixed form of anisotropic conductive tape or in a mixed form of anisotropic conductive ink, anisotropic conductive tape and anisotropic conductive rubber. 12. The method of claim 11, wherein the front conductive film or the anisotropic conductive film has a thickness greater than or equal to a gap between upper and lower cases. The method of claim 10, wherein the upper and lower cases and the EL keypad are fixed by using screws. First and second electrode terminals of the EL element for keypad; A connector connected to the first and second electrodes of the driving power source, The first and second electrode terminals of the EL element for keypad are inserted into the connector, so that the first and second electrode terminals of the EL element for keypad are electrically connected to the first and second electrodes of the driving power source. The connection structure between the EL element for the keypad and the driving power supply. First and second electrode terminals of the EL element for keypad; A groove formed in the case, a metal film formed in the groove and connected to the first and second electrodes of the driving power source, and a connector having fixing means; The first and second electrode terminals of the EL element for keypad are inserted into the grooves of the connector, respectively, and fixed by fixing means, so that the first and second electrode terminals of the EL element for keypad are first and second of the driving power source. A connecting structure of an EL element for a keypad and a driving power supply, which are electrically connected to each other with an electrode. 18. The anisotropic conductive film or anisotropic conductive film according to claim 17, wherein a front conductive film or an anisotropic conductive film is provided between the first and second electrode terminals of the keypad EL element and the first and second electrodes of the driving power supply. The film is connected to the keypad EL element and the driving power source, characterized in that it strengthens the adhesion between the first and second electrode terminals of the EL element for keypad and the first and second electrodes of the driving power source and electrically connects them. rescue. 19. The method of claim 18, wherein the forward conductive film forms or inserts a thin film layer on which conductive ink is printed on the first and second electrode terminals, attaches or inserts a front conductive tape or a front conductive rubber, or A connecting structure of an EL element for a keypad and a driving power supply, which is attached or inserted in a mixed form of a conductive tape and a front conductive rubber or in a mixed form of a front conductive ink and a front conductive tape. 19. The method of claim 18, wherein the anisotropic conductive film is formed or inserted into the first and second electrode terminals, a thin film layer printed with anisotropic conductive ink, or attached or inserted an anisotropic conductive tape or anisotropic conductive rubber, or with anisotropic conductive rubber A connecting structure of an EL element for a keypad and a driving power supply, which is attached or inserted in a mixed form of anisotropic conductive tape or in a mixed form of anisotropic conductive ink, anisotropic conductive tape and anisotropic conductive rubber. 19. The connecting structure according to claim 18, wherein the conductive film is an electrode of an FPCB bonded to the first and second electrode terminals by thermocompression bonding. Preparing a connector having a groove formed inside the case, a metal film formed in the groove connected to the first and second electrodes of the driving power source, and a fixing means; Opening the fixing means of the connector; Forming or inserting a forward conductive film or an anisotropic conductive film on the first and second electrode terminals of the keypad EL element, respectively; Inserting first and second electrode terminals of an EL element for keypad having the forward conductive film or the anisotropic conductive film into the groove of the connector, respectively; Covering the fixing means to electrically connect the first and second electrode terminals of the EL element for keypad to each other with the first and second electrodes of the driving power source; How to connect 23. The method of claim 22, wherein the forward conductive film is formed or inserted into the first and second electrode terminals, a thin film layer printed with a conductive ink, attached or inserted a front conductive tape or a front conductive rubber, or forward A connecting structure of an EL element for a keypad and a driving power supply, which is attached or inserted in a mixed form of a conductive tape and a front conductive rubber or in a mixed form of a front conductive ink and a front conductive tape. 23. The method of claim 22, wherein the anisotropic conductive film is formed or inserted into the first and second electrode terminals, a thin film layer printed with anisotropic conductive ink, or attached or inserted an anisotropic conductive tape or anisotropic conductive rubber, or anisotropic conductive rubber and A connecting structure of an EL element for a keypad and a driving power supply, which is attached or inserted in a mixed form of anisotropic conductive tape or in a mixed form of anisotropic conductive ink, anisotropic conductive tape and anisotropic conductive rubber. Preparing a connector having a groove formed inside the case, a metal film formed in the groove connected to the first and second electrodes of the driving power source, and a fixing means; Opening the fixing means of the connector; Forming FPCB electrodes on the first and second electrode terminals of the EL element for keypad, respectively; Inserting first and second electrode terminals of the EL element on which the FPCB electrode is formed into the grooves of the connector, respectively; Covering the fixing means to electrically connect the first and second electrode terminals of the EL element for keypad to each other with the first and second electrodes of the driving power source; How to connect 27. The method of claim 25, wherein the FPCB electrode is attached to the first and second electrode terminals using an anisotropic conductive thermocompression adhesive, respectively.