JPH06338393A - Thin electroluminescence lamp and manufacture thereof - Google Patents

Abstract

PURPOSE:To dispense with an outer film by using a back electrode made of a conducting material having little migration, an insulating layer having a low moisture absorption property, and a luminescence layer dispersed with moisture-proof-processed phosphors in a fluororesin, and covering the end faces of the back electrode and a transparent electrode. CONSTITUTION:A back electrode 2 made of a conducting maternal having less migration than that of the silver of a carbon paste or a nickel paste is formed in a range smaller than a film 1 on the base film 1 made of a PET film 10 or the like. An insulating layer 3 dispersed with a high-dielectric material in a fluororesin and a phosphor layer 4 dispersed with moisture-proof-coated phosphors in a fluororesin are formed on it in a range larger than the forming range of the electrode 2. A transparent electrode 5 made of In oxide or Sn oxide is formed on it in a range smaller than the range of the layer 4. An insulating film made of the PET film 10 is provided on it via an adhesive layer 9, and the end face is covered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroluminescent lamp and a method for manufacturing the same, and more particularly to an ultra-thin electroluminescent lamp that does not use a skin film and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a conventional electroluminescent lamp 50, as shown in an enlarged cross-sectional view of a main part of FIG. 5, an electroluminescent element 47 having a substantially rectangular planar shape composed of a laminate described later is provided with a moisture-proof material such as a fluorine resin. It has a structure in which it is hermetically sealed by outer skin films 48 and 49 having properties.

The electroluminescent device 47 is arranged in order from the lower layer.
Backside electrode 41 such as Al foil, reflective insulating layer 42, issuing layer 4
3. The transparent electrode 44 is laminated and formed. In addition,
In the figure, 45 and 46 are hygroscopic layers formed of a hygroscopic film such as polyamide disposed above and below the electroluminescent element 47. Here, generally, an electroluminescent lamp is a thin surface light emitter, and its thickness is about 1 mm in the past, but when it is used as a liquid crystal backlight such as a pager or a pager, a thickness of about 0.3 mm is required. Is required. In order to meet such a demand, a light emitting layer 63 using a phosphor, which has a moisture-proof coating on a transparent conductive film 62 made of a PET film 60 and an ITO 61, as shown in FIG.
A thin electroluminescent lamp 70 having an insulating layer 64, a back electrode 65, and an overcoat 66 laminated and printed is commercialized. The peripheral edge portion of the ITO 61 is half-cut (A portion) so that the conductive portion is not exposed to the outside.

[0004]

However, in the structure as shown in FIG. 6, a great number of man-hours are required to half-cut the peripheral edge portion of the ITO 61, and the transparent conductive film 6 is used.
2, the light emitting layer 63 and the insulating layer 64 are sequentially formed by printing. Therefore, Japanese Utility Model Laid-Open No. 63-112795 and Japanese Unexamined Patent Publication No. 2-2.
As disclosed in Japanese Laid-Open Patent Publication No. 76193, pinholes are generally generated in the light emitting layer and the insulating layer, and the withstand voltage is lowered, so that smoothing treatment is required and the number of steps is increased. Furthermore, since each layer is formed by printing, it suppresses shrinkage of each layer,
Further, in order to secure a thickness for half-cutting, there is a problem that the base transparent conductive film is as thick as 188 μm and it is difficult to make it thinner than this. Therefore, the present invention has been proposed in consideration of the above problems, and the purpose thereof is to prevent the reduction of the life even though the conventional skin film, the moisture absorption film and the like are not used, and also to provide the transparent conductive film. Provides an ultra-thin, inexpensive electroluminescent lamp that can handle various shapes without causing electric shock due to the exposure of the electrodes at the peripheral edge without causing half-cutting, or lowering the withstand voltage due to pinholes in the film, nor deforming. To do.

[0005]

In order to solve the above-mentioned problems, the thin electroluminescent lamp of the present invention comprises a first insulating film, a back electrode made of a conductive substance having migration smaller than that of silver, and a high dielectric constant. A thermo-compression laminated body of an insulating layer in which a conductive substance is dispersed in a fluororesin, a light emitting layer in which a moisture-proof phosphor is dispersed in a fluororesin, a transparent electrode, and a second insulating film. The respective end faces of the first insulating film, the insulating layer and / or the light emitting layer, and the second insulating film extend beyond the end faces of the back electrode and the transparent electrode, and the end faces of the electrodes are exposed. Characterized by not being.

Further, in the manufacturing method thereof, a back electrode (or a transparent electrode) is selectively printed on the first insulating film in an area smaller than the film, and an insulating layer, a light emitting layer (or a light emitting layer, an insulating layer) is formed thereon. Layer) is sequentially selected and printed, a transparent electrode (or a back electrode) is selectively printed thereon to form a laminate, and the laminate and the second insulating film are faced to each other and thermocompression-bonded. It is characterized by doing.

[0007]

[Function] A back film and a moisture absorbing film are obtained by using a material having less migration for the back electrode, using a less hygroscopic material for the resin of the insulating layer and the light emitting layer, and using a moisture-proof phosphor for the light emitting layer. It is possible to reduce about 1% of the conventional electroluminescent lamp without shortening the life.
An inexpensive ultra-thin electroluminescent lamp with a thickness of / 4 can be realized. Moreover, since the end surfaces of the back surface electrode and the transparent electrode are covered so as not to be exposed, a complicated process such as half cutting is unnecessary,
Can be easily insulated.

Further, since they are bonded by thermocompression bonding, it is possible to reduce the adverse effect of pinholes in the insulating layer and prevent the breakdown voltage failure.
In addition, since the adhesive strength is improved, it is possible to prevent water from entering and peeling off from the interface and prevent the life from being shortened. Moreover, since the front and back substrate films are made of the same material, it is possible to easily and inexpensively provide an electroluminescent lamp that does not cause warpage or deformation during thermal shock or temperature cycle.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and manufacturing method of the electroluminescent lamp of the first embodiment of the present invention will be described with reference to FIGS.

The electroluminescent lamp 12 of the present invention has a structure shown in the enlarged cross-sectional view of the main part of FIG. In addition, as shown in the plan view of the manufacturing process of FIG.
As shown in (a), a back electrode 2 made of carbon paste is selected on a first insulating film, for example, a base film 1 made of a PET film having a thickness of 75 μm, in a range smaller than the base film and screen printing is performed at a thickness of about 10 μm.
It is formed with a thickness of m. Next, as shown in FIGS. 2B and 2C, an insulating layer 3 in which an insulator such as barium titanate is dispersed in vinylidene fluoride, fluororubber, etc., and a phosphor in which zinc sulfide is activated with copper are moisture-proof. Coated phosphor (eg Sy
Type 40) manufactured by Lvania Co., Ltd. is dispersed in vinylidene fluoride, fluororubber or the like, and the light emitting layer 4 is sequentially screen-printed with a partially notched pattern (a short circuit with the transparent electrode) having a size and shape slightly larger than the back electrode 2. About 2 each
Selectively formed with a thickness of 0 μm and about 50 μm. Next, FIG.
As shown in (d), the transparent electrode 5 in which a conductive material such as indium oxide or tin oxide is dispersed in the resin is arranged in a range smaller than the light emitting layer 4 or the insulating layer 3 in a partially cutout pattern (short circuit with the back surface electrode). (Prevention) to form a laminate 8 by selectively forming on the light emitting layer with a thickness of about 10 μm, and further forming current collecting bands 6 and 7 for external extraction on the back surface electrode 2 and the transparent electrode 5, respectively.

Next, a 75 μm thick insulating film 11 having a second insulating film, for example, a PET film 10 having a size slightly larger than that of the light emitting layer 4 and an adhesive layer 9 provided thereon, and the laminate 8 as a transparent electrode 5. The adhesive layer 9 is faced to a position where the current collecting bands 6 and 7 are exposed to the outside, and thermocompression-bonded with a laminator, a hot press, etc. The electroluminescent lamp 12 in which and are closely contacted as shown in FIGS. 1 (a) and 2 (e) is obtained. The thus obtained electroluminescent lamp 12 has a thickness of 0.23 mm, which makes it possible to realize an ultrathin thickness of about 1/4 of the conventional thickness.

As a modification of the first embodiment, the transparent electrode may not be printed on the light emitting layer, and the insulating film with ITO may be thermocompression bonded to the light emitting layer side. Further, as shown in FIG. 1B, the base film 1 and the insulating film 11 may not be provided with a portion protruding from the end face of the insulating layer 3, and the point is that the end face of the back surface electrode other than the lead attachment portion is the insulating layer or the light emission. It is indispensable that the layer and the base film are not covered and exposed, and that the end face of the transparent electrode other than the lead attachment portion is covered and not exposed by the light emitting layer or the insulating film.

Next, various characteristics of the electroluminescent lamp 12 of the present invention thus obtained will be described in comparison with an electroluminescent lamp having a conventional structure. First, Table 1 shows initial electrical characteristics.

[0014]

[Table 1]

Further, FIG. 3 shows 50 ° C./30% RH, 100
Life characteristics when driven by V-400Hz, Figure 4 shows 50 ℃ / 90
The solid line shows the characteristics of the electroluminescent lamp according to the present invention, and the dotted line shows the characteristics of the conventional electroluminescent lamp, in terms of the life characteristics when driving at 100% RH and 100 V-400 Hz. Thus, although the electroluminescent lamp of the present invention is not sealed with the outer cover film, it is almost the same as the conventional product sealed with the outer cover film in terms of initial electric characteristics as well as life characteristics in a dry atmosphere and a high humidity atmosphere. does not change. In addition, since the formation range of the back surface electrode, the insulating layer, the light emitting layer, and the transparent electrode is smaller than that of the base film 1 and the insulating film 11, the ends of the electrodes are not exposed to the outside and short-circuited with other electric parts.

In particular, in the electroluminescent lamp of FIG. 1 (a), one electrode (back surface electrode) is triple-layered by the insulating layer, the light emitting layer, and the insulating film, and the insulation is extremely good. On the other hand, the conventional one in which an insulating layer or the like is formed and sealed with an outer film is only a single layer, and the half cut in FIG. 6 is also a single layer. Moreover, since the present invention does not perform half-cutting, the number of steps can be reduced.

Further, in the above-described embodiment, an example was described in which the back surface electrode was printed on the first insulating film, and the insulating layer, the light emitting layer and the transparent electrode were printed in that order, but on the first insulating film. The transparent electrode, the light emitting layer, the insulating layer, and the back surface electrode may be printed in this order, and the laminate and the second insulating film may be thermocompression bonded, or the opposing surface during thermocompression bonding is transparent to the light emitting layer. It may be between the electrodes or between the back electrode and the insulating layer.

In the first embodiment, the carbon paste is printed as the back electrode on the film. However, the invention is not limited to this. A nickel paste, a transparent electrode such as ITO, or Al may be used. A metal thin film formed by vapor deposition may be used, or a laminate of these may be used. In essence, any material may be used as long as the material has less electromigration than Ag. Also,
The binder for forming the light emitting layer and the insulating layer may be any as long as it has a low moisture absorption rate, and the device for sticking the laminated films on the front and back is any device capable of thermocompression bonding. But it's okay.

[0019]

According to the present invention, the skin film and the moisture absorbing film can be removed without shortening the life, and the electrodes can be inexpensively insulated without the need for half-cutting. It is possible to realize an inexpensive ultra-thin electroluminescent lamp having a thickness of about 1/4. In addition, without causing pressure failure due to pinholes during printing, and using a base material film of the same material on both the front and back sides, a high-quality electroluminescent lamp that does not warp during heat shock or heat cycle is realized. it can.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of an electroluminescent lamp showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a manufacturing process of the electroluminescent lamp according to the first embodiment of the present invention.

FIG. 3 shows the electroluminescence lamp of the first embodiment of the present invention at 50 ° C. /
Life characteristics at 30%, 100V-400Hz drive.

FIG. 4 shows the electroluminescence lamp of the first embodiment of the present invention at 50 ° C. /
Life characteristics when 90%, 100V-400Hz drive.

FIG. 5 is an enlarged sectional view of a main part of a conventional electroluminescent lamp.

FIG. 6 is another conventional electroluminescent lamp.

[Explanation of symbols]

 1 Base Film 2 Back Electrode 2a Lead Attachment Part 3 Insulating Layer 4 Light Emitting Layer 5 Transparent Electrode 6,7 Current Collection Band 8 Laminated Body 9 Adhesive Layer 10 PET Film 11 Insulating Film 12 Electroluminescent Lamp

Claims (5)

[Claims] 1. A first insulating film, a back electrode made of a conductive substance having a migration smaller than that of silver, an insulating layer in which a high dielectric substance is dispersed in a fluorine resin, and a moisture-proof phosphor. A light emitting layer dispersed in a fluororesin,
A laminated body in which a transparent electrode and a second insulating film are thermocompression bonded, wherein each end face of the first insulating film, the insulating layer and / or the light emitting layer, and the second insulating film is the back electrode. And an end surface of the transparent electrode, the end surface of the electrode is not exposed, and a thin electroluminescent lamp. 2. The end faces of the first and second insulating films further protrude from the end faces of the insulating layer and the light emitting layer, and the protruding portions are in close contact with each other. 1. The thin electroluminescent lamp described in 1. 3. The back electrode is carbon paste and / or
2. The thin electroluminescent lamp according to claim 1, wherein the thin film electroluminescent lamp is a nickel paste, an ITO thin film, or a metal thin film, and the transparent electrode is a transparent conductive paste or an ITO thin film. 4. The thin electroluminescent lamp according to claim 1, wherein the first and second insulating films are PET (polyethylene terephthalate) films having the same material and the same thickness. 5. A back electrode (or a transparent electrode) is selectively printed on a first insulating film in an area smaller than the film, and an insulating layer, a light emitting layer (or a light emitting layer, an insulating layer) is formed thereon.
And a transparent electrode (or a back electrode) are selectively printed thereon to form a laminate, and the laminate and the second insulating film are faced to each other and thermocompression-bonded. And a method for manufacturing a thin electroluminescent lamp.