JP3191034B2 - EL element manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an EL device.

[0002]

2. Description of the Related Art Conventionally, the production of a large number of EL elements by multi-cavity is first performed by using polyethylene terephthalate (hereinafter referred to as "PET").
That. ), A transparent electrode made of indium tin oxide (hereinafter referred to as “ITO”) is formed on the entire surface of the transparent base film.
Light-emitting layer, insulating layer and carbon paper
A plurality of patterns in which back electrodes are sequentially laminated by a strike are formed, and a protective layer is formed on the entire back electrode on the transparent electrode. After that, the above-mentioned patterns are separated by punching to produce a plurality of EL elements. As a method of this punching, for example, an ITO film is set on a press machine, and a positioning mark provided on the ITO film is recognized by a video camera or the like, and the ITO film is moved. I'm punching the pattern.

[0003] The positioning mark is a pattern
It is desirably carried out together with the formation of the pattern. Therefore, this positioning mark is formed on the ITO film by carbon paste at the same time when the back electrode is formed. Further, since the transparent base film side becomes the light emitting surface, if this side is placed on a press machine, the light emitting surface side may be damaged, which is not desirable. In order to avoid this, after the above-mentioned protective layer is formed, the ITO film is turned over and the transparent base film is punched up.

[0004]

In the above prior art,
Since the positioning mark is black, when punching with the transparent base film side up, if the base on which the ITO film is placed on the press is white, it can be recognized as a positioning mark, but if the base is black Cannot be distinguished from the base color and does not function as a positioning mark. Therefore, these positioning marks need to have a configuration in which black marks are arranged on a whitish background. When performing punching with the transparent base film side up, the positioning mark is shaped like a black mark on a white background when viewed from above the transparent base film, and this positioning mark is used as a pattern. The following can be considered as a method of manufacturing an EL element that can be performed simultaneously with the formation of the element. That is, at the time of forming an insulating layer using an insulating ink containing barium titanate which is a high dielectric substance, a ring-shaped first positioning mark is simultaneously formed on the transparent electrode on the transparent electrode. A second positioning mark having an area smaller than that of the first positioning mark is formed on the first positioning mark with a carbon paste so as to fill the hole of the ring, and the color is drawn against the white background of the insulating ink. There is a method of forming a mark with a black paste. However, according to this method, it is difficult to print the insulating ink except for the ring hole when forming the first ring-shaped positioning mark. Is impossible.

Therefore, an object of the present invention is to provide a multi-cavity EL device.
In the manufacture of the element, a positioning mark that can be recognized even when the table on which the ITO film of the press machine is mounted is black is formed without providing a special process.

[0006]

In order to achieve the above object, a method of manufacturing an EL device according to the present invention comprises the steps of: providing a light emitting layer, an insulating layer, and a carbon layer on a transparent electrode formed on one surface of a transparent base film; A plurality of patterns in which back electrodes made of paste are sequentially laminated are formed, and thereafter, each pattern is separated by punching with the other surface of the transparent base film facing upward to form a plurality of EL elements. In the manufacturing method, at the time of forming a back electrode, a first electrode of the carbon paste is simultaneously placed near the pattern on the transparent electrode.
A step of forming a positioning mark, and after formation of the back electrode and before separation of each pattern, a transparent electrode lead-out portion formed integrally with the transparent electrode at an end of the transparent electrode; A step of forming a terminal portion of silver paste on a back electrode lead portion formed integrally with the back electrode at the end of the electrode, and simultaneously forming the terminal portion on the first positioning mark at the time of forming the terminal portion. Forming a second positioning mark having an area larger than the first positioning mark with silver paste, and forming the positioning mark for punching with the first and second positioning marks.

[0007]

An embodiment of the present invention will be described with reference to the drawings. With reference to FIGS. 1 to 3, an example of manufacturing an EL element by a multi-cavity method will be described in detail according to the manufacturing steps. A transparent base film 1 made of a PET film is large enough to manufacture a large number of EL elements. A transparent electrode 2 is formed by depositing ITO on the entire surface of the transparent base film 1. It is. The light emitting layer 3 is formed on the transparent electrode 2 by dividing it into a large number (two in FIG. 1). The light emitting layer 3 is formed by printing and drying a light emitting material such as zinc sulfide and an ink kneaded with a high dielectric binder (such as cyanoethylated cellulose) dissolved in a solvent in advance. Next, an insulating layer 4 is formed on each light emitting layer 3. The insulating layer 4 is formed by printing and drying an ink composed of barium titanate powder and a high dielectric binder previously dissolved in a solvent to form a layer.
Further, on each of the insulating layers 4, a back electrode 5 is formed. The back electrode 5 is formed by printing and drying a conductive paste (carbon paste) made of carbon powder and a resin (acrylic or the like) dissolved in a solvent. When the back electrode 5 is formed, the first positioning marks 5a and 5b made of the same carbon paste as described above are simultaneously formed near the pattern of the light emitting layer, the insulating layer, and the back electrode on the transparent electrode 2. As shown in FIG. 1, at the lower end of each back electrode 5, a transparent electrode lead portion 2a is formed so as to extend integrally with the transparent electrode 2. At the lower end of each insulating layer 4, an insulating layer 4a extending integrally with the insulating layer 4 and partially laminated on each transparent electrode lead-out portion 2a is formed. On the insulating layer 4a at the lower left end of each back electrode 5, a back electrode lead portion 5c is formed so as to extend integrally with the back electrode 5. In a portion of the transparent electrode lead-out portion 2a where neither the light emitting layer 3 nor the insulating layer 4 is formed, a layer made of the same carbon paste as described above is formed at the same time when the back electrode 5 is formed. After the formation of the back electrode 5, the terminal portions 6 and 6 made of silver paste are formed on the transparent electrode lead portion 2a and the back electrode lead portion 5c. At the same time as forming the terminal portions 6 and 6, the same silver paste as above is used on the first positioning marks 5a and 5b.
The second positioning marks 6a and 6b having a larger area than the first positioning marks are formed. Further, a protective layer 7 made of silicon is formed on the entire surface of the rear electrode 5 on the transparent electrode 2. The transparent base film 1, the transparent electrode 2, the light emitting layer 3, the insulating layer 4, the back electrode 5, the terminal portion 6, and the protective layer 7 constitute one EL element pattern 8.

[0008] Positioning marks (circular marks) by the first and second positioning marks 5a and 6a are provided one at the upper left and lower right for one EL element. Also, the first
A plurality of positioning marks (cross-shaped marks) formed by the two positioning marks 5b, 6b are provided below and above a row of a plurality of EL element patterns 8, 8,... Or in a direction perpendicular to this row.

The respective patterns 8, 8 of the above-described EL element will be described below.
Are separated by punching to produce a plurality of EL elements. First, the ITO film is turned upside down, and the transparent base film 1 side is set up, and set in a punching device (not shown). Then, while recognizing the cross-shaped marks 5b and 6b with the video camera of the punching device,
A hole is made at the intersection of the cross lines of the cross mark 5b. This is done for the two cross marks 5b. Thereafter, the ITO film is placed on a jig (not shown) with the transparent base film 1 side up. At this time, the two holes formed at the intersections of the cross marks of the cross mark 5b are fitted to the two positioning pins of the jig, respectively, and the ITO film is fixed to the jig. Thereafter, the jig is set on a press machine (not shown), and while the jig or tool is being moved, the round marks 5a and 6a are recognized by a video camera or the like, and the EL element is determined based on the positioning marks. Are sequentially separated by punching to produce a plurality of EL elements. At this time, as shown in FIGS. 4 and 5, the cross-shaped marks 5b and 6b and the round-shaped marks 5a and 6a are formed by the carbon paste black mark against the whitish color of silver paste. The marks 5a and 5 are used not only when the table on which the ITO film of the punching device or the press is placed but also when it is black.
b can be recognized. At this time, each pattern 8 of the EL element was used.
The upper left and lower right ones each have a round mark 5a,
6a is recognized by a video camera or the like as a positioning mark at the time of pressing.

The present invention is not limited to the above-described embodiment, and various modifications are possible.

For example, an ITO film is set in a punching device, and holes are sequentially formed in the carbon portion of the ITO film while recognizing the round marks 5a and 6a with a video camera or the like. After that, the ITO film is set on the press machine, the above-mentioned holes are used as the positioning holes, the fitting holes are fitted to the positioning pins of the press machine, the ITO film is positioned with respect to the press machine, and each pattern is punched. Is also conceivable.

Also, when an index or the like is printed on the surface of the transparent base film after a plurality of patterns 8, 8,... Are formed, a cross-shaped mark is used as a mark for positioning the ITO film with respect to the printing press. The keys 5b and 6b can also be used.

Further, the ITO film is set on a press machine, a plurality of cross marks 5b and 6b are used, and the cross mark 5b is formed by a video camera of the press machine without making holes in these marks. , 6b while recognizing these markers
Each pattern 8, 8... Of the EL element can be separated by punching with reference to the reference mark.

The positioning mark for punching is cross-shaped,
The shape is not limited to a round shape, and may be, for example, a diamond shape.

[0015]

As described above, in the method of manufacturing an EL device according to the present invention, the first positioning mark made of carbon paste is formed simultaneously with the formation of the back electrode, and the first positioning mark is formed simultaneously with the formation of the terminal portion. The second mark having a larger area than the first positioning mark with silver paste on the mark.
Since the positioning mark is formed, the punch can be performed with the transparent base film side facing up, and the positioning mark can be recognized even if the base on which the ITO film of the press is placed is white or black. Also, no special process is required for forming the positioning mark.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line AA in FIG.

FIG. 3 is an enlarged cross-sectional view of the positioning mark according to the first embodiment;

FIG. 4 is an enlarged rear view of the positioning mark according to the first embodiment;

FIG. 5 is an enlarged rear view of the positioning mark according to the first embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent base film 2 Transparent electrode 2a Transparent electrode lead part 3 Light emitting layer 4 Insulating layer 5 Back electrode 5a, 5b First positioning mark 5c Back electrode lead part 6 Terminal part 6a, 6b Second positioning mark 8 Pattern In

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H05B 33/00-33/28 B26D 5/00-5/42

Claims (1)

(57) [Claims] 1. A plurality of patterns in which a light emitting layer, an insulating layer, and a back electrode made of carbon paste are sequentially laminated on a transparent electrode formed on one surface of a transparent base film, and then the transparent electrode is formed. In the method of manufacturing an EL element, in which a plurality of EL elements are formed by separating each of the patterns by punching with the other surface of the base film facing upward, when the back electrode is formed, the vicinity of the pattern on the transparent electrode Simultaneously forming a first positioning mark with the carbon paste; and extending integrally with the transparent electrode at an end of the transparent electrode after the formation of the back electrode and before the separation of the patterns. Silver paste on the transparent electrode lead-out portion formed by forming the back electrode and the back electrode lead-out portion formed integrally with the back electrode at the end of the back electrode. A step of forming a second positioning mark having a larger area than the first positioning mark using the silver paste on the first positioning mark at the same time as forming the terminal section. Wherein the first and second positioning marks form a positioning mark for the punching.