JP2006260862A - Electroluminescent lamp and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultra-thin electroluminescent lamp, and its manufacturing method, with excellent mechanical strength suitable for a backlight of a liquid crystal display or a key-part illumination of a cell phone. <P>SOLUTION: A double-layer structure base material film 6 with a slightly adhesive film 4 stuck with a thin-film transparent film 5 is used, on top of which, a transparent electrode 7, a luminous layer 8, a reflective insulation layer 9, a rear-face electrode 10, and a protective layer 11 are printed in turn. After drying and hardening, the slightly adhesive film 4 is peeled off and removed from the thin-film transparent film 5 to obtain an ultra-thin electroluminescent lamp 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electroluminescent lamp and a manufacturing method thereof, and more particularly to an ultra-thin electroluminescent lamp using a thin base film and a manufacturing method thereof.

  As the ultra-thin electroluminescent lamp, electroluminescent lamps formed only on a printing layer without a base film are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2004-55440 and 2004-207015.

FIGS. 3A and 3B are cross-sectional views of the main part showing the configuration of a conventional electroluminescent lamp 40. A conventional electroluminescent lamp 40 is formed by sequentially laminating a transparent electrode layer 42, a light emitting layer 43, a reflective insulating layer 44, and a back electrode layer 45 on the upper surface of a release substrate 41 that has been subjected to a release treatment. The electroluminescent lamp 40 is manufactured by peeling the release substrate 41 from the transparent electrode layer 42. Further, as in other conventional electroluminescent lamps 50 shown in FIGS. 4A and 4B, a transparent insulating layer 52, a transparent electrode layer 53, The electroluminescent lamp 50 is manufactured by laminating the light emitting layer 54, the reflective insulating layer 55, and the back electrode layer 56 sequentially and finally peeling the release substrate 51 from the transparent insulating layer 52.
JP 2004-55440 A JP 2004-207015 A

  However, the conventional electroluminescent lamps 40 and 50 described above have the following problems.

  Since there was no base film and it was formed only by the printing layer, there was a problem that it was weak against mechanical strength such as tension, tearing and pressing pressure. In addition, since printing is performed directly on the release base materials 41 and 51 which have been subjected to a release treatment such as silicon, the printability is deteriorated depending on the type of resin. For this reason, there is a problem that repellence is likely to occur during printing, and the print layer and the release substrates 41 and 51 are partially peeled off during the manufacturing process due to heat shrinkage during drying. In addition, it is conceivable to produce an ultra-thin electroluminescent lamp by using a thin transparent film as a base material as it is. There were problems such as remaining on the printing surface, difficulty in handling after printing, and poor workability.

  The present invention has been conceived in order to solve the above-described problems, and provides an ultra-thin electroluminescent lamp excellent in strength and suitable for a backlight of a liquid crystal or a key part of a cellular phone, and a method for manufacturing the same. The purpose is to do.

  In order to achieve the above object, the electroluminescent lamp according to claim 1 of the present invention supports the transparent electrode in an electroluminescent lamp in which a light emitting layer and a reflective insulating layer are formed between a transparent electrode and a back electrode. The base material to be formed is a thin film transparent film having a thickness of 10 to 35 μm. According to this configuration, since the substrate is made of a film, an ultra-thin electroluminescent lamp excellent in mechanical strength and insulation can be provided.

  The electroluminescent lamp according to claim 2 is the electroluminescent lamp according to claim 1, wherein the transparent electrode includes at least one of indium oxide, tin oxide, antimony oxide, zinc oxide, and a conductive polymer. It consists of a transparent conductive material. According to this structure, the transparent electrode excellent in transparency and electroconductivity can be obtained easily.

  The electroluminescent lamp according to claim 3 is the electroluminescent lamp according to claim 2, wherein the transparent electrode is formed by any one of printing, vapor deposition, and coating. According to this configuration, a transparent electrode excellent in transparency and conductivity can be easily obtained with high productivity.

  According to a fourth aspect of the present invention, there is provided a method for manufacturing an electroluminescent lamp, comprising: attaching a thin transparent film having a thickness of 10 to 35 μm to a slightly adhesive film having a fine adhesive layer formed on a transparent film having a thickness of 50 to 188 μm. A transparent electrode, a light emitting layer, a reflective insulating layer, a back electrode, and a protective layer are sequentially printed on a base film having a two-layer structure, and after drying and solidifying, the fine adhesive film is peeled off from the thin film transparent film. Features. According to this manufacturing method, since the base film at the time of manufacture is sufficiently thick, no wrinkles or creases occur during printing or handling, and after the electroluminescent lamp is formed, the slightly adhesive film is peeled off from the thin transparent film. Therefore, an ultra-thin electroluminescent lamp can be easily manufactured.

  According to a fifth aspect of the present invention, there is provided a method for manufacturing an electroluminescent lamp, comprising forming a transparent electrode on a thin transparent film having a thickness of 10 to 35 μm on a thin adhesive film having a thin adhesive layer formed on a transparent film having a thickness of 50 to 188 μm. A light-emitting layer, a reflective insulating layer, a back electrode, and a protective layer are sequentially printed on a base film having a two-layer structure formed by attaching the thin film transparent conductive film, dried and solidified, and then the thin adhesive film is transparent to the thin film It is characterized by peeling off from the conductive film. According to this manufacturing method, an ultra-thin electroluminescent lamp can be easily manufactured, and the number of printed layers can be further reduced.

  According to the electroluminescent lamp of the present invention, since the base film uses a two-layer structure product of a slightly adhesive film and a thin transparent film, it does not cause trouble in handling during manufacturing, and can be easily adhered after manufacturing. The film can be peeled from the thin film transparent film. Thereby, it is possible to easily manufacture an ultra-thin electroluminescent lamp suitable for key part illumination of a cellular phone, which is excellent in mechanical strength using a thin film transparent film as a base material.

  Hereinafter, preferred embodiments of the electroluminescent lamp of the present invention will be described with reference to the drawings. 1A is a cross-sectional view of a main part of an electroluminescent lamp 1 according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view of a main part for explaining a method for manufacturing the electroluminescent lamp 1.

  As shown in FIG. 1 (a), the electroluminescent lamp 1 of the present invention is a microadhesive film 4 in which a microadhesive layer 3 is formed on a transparent film 2 made of PET (polyethylene terephthalate) having a thickness of 50 to 188 μm. The base film 6 is a laminated film on which a thin transparent film 5 made of PET or the like having a thickness of 10 to 35 μm is attached. In the method of manufacturing the electroluminescent lamp 1, first, a transparent conductive paste made of transparent conductive powder such as transparent ITO (Indium tin oxide) is printed on the base film 6, and the transparent electrode 7 is 5 to 15 μm thick. To form. Next, an ink in which a phosphor 8a in which zinc sulfide is activated with copper and applied with a moisture-proof coating is dispersed on a transparent electrode 7 in a resin 8b such as fluorine rubber, for example, is printed, and the light emitting layer 8 has a thickness of 20 to 40 μm. Form to thickness. Next, ink in which white dielectric powder such as barium titanate is dispersed in the resin is printed on the light emitting layer 8 to form the reflective insulating layer 9 to a thickness of 10 to 20 μm. Next, a conductive paste such as carbon ink is printed on the reflective insulating layer 9 to form the back electrode 10 to a thickness of 10 to 20 μm. Next, an insulating ink is printed on the back electrode 10, and the protective layer 11 is formed to a thickness of 10 to 20 μm. Then, as shown in FIG.1 (b), the slightly adhesive film 4 is peeled off from the thin film transparent film 5, and the ultra-thin electroluminescent lamp 1 of thickness 70-150 micrometers is obtained.

  Thus, since the electroluminescent lamp 1 of the present embodiment uses the thin film transparent film 5 as the base material, it has excellent tensile and tearing strength and is less deformed by local pressing force, 500 g, 1 million. It can withstand keystrokes when used for key part illumination of a mobile phone, etc. without deformation, disconnection, and light emission abnormalities after a single keystroke test. Furthermore, if the fine-adhesive film 4 is finally peeled off, it is effective in preventing scratches in the process or transportation.

  Here, the thickness of the thin transparent film 5 is set to 10 to 35 μm, but if it is 10 μm or less, wrinkles are likely to occur when pasted on the slightly adhesive film 4, and the feasibility is inferior. Because. The thickness of the more preferable thin film transparent film 5 is 16-25 micrometers. The thin transparent film 5 can be made of not only PET but also PEN (polyethylene naphthalate), polycarbonate resin, polymethyl methacrylate resin, polyester resin, polyethersulfone resin, polyarylate resin, polyolefin resin, and the like.

  Moreover, although the thickness of the slightly adhesive film 4 is 50-188 micrometers, when it is 50 micrometers or less, there is a possibility that the above-mentioned printing problems (suction marks, handling, workability, etc.) may occur, and at the time of peeling off finally. This is because it is difficult to peel off, and when the thickness is 188 μm or more, the cost of the substrate is increased, and the number of windings of the film is decreased, so that the price of the original fabric itself is increased.

  Moreover, since it will become difficult to peel after product manufacture if the adhesive force of the slightly adhesive film 4 is too strong, as an adhesive force, the thing of 0.01-0.2N / 25mm (vs PET) is desirable.

  Moreover, if the mold release process is performed on the side where the thin transparent film 5 is attached to the slightly adhesive layer 3, the slightly adhesive film 4 can be more easily peeled off.

  In the present embodiment, a transparent conductive paste using ITO powder is used as the material of the transparent electrode 7, but powders such as antimony oxide and zinc oxide and organic polymers such as PEDOT (Polyethylene dioxythiophene) can also be used. When the organic polymer is used, the thickness of the transparent electrode 7 is 2 to 5 μm, and a thinner electroluminescent lamp 1 can be provided.

  Next, an electroluminescent lamp according to a second embodiment of the present invention will be described with reference to the drawings. 2A is a cross-sectional view of the main part of the electroluminescent lamp 20 according to the second embodiment of the present invention, and FIG. 2B is a cross-sectional view of the main part for explaining a method for manufacturing the electroluminescent lamp 20.

  As shown in FIG. 2A, the electroluminescent lamp 20 of the present invention has a thickness on a slightly adhesive film 23 in which a slightly adhesive layer 22 is formed on a transparent film 21 made of PET or the like having a thickness of 50 to 188 μm. A laminated film in which a thin film transparent conductive film 26 formed by vapor-depositing a transparent electrode 25 such as ITO is attached to a thin film transparent film 24 made of 10 to 35 μm of PET or the like is used as a base film 27. In the method of manufacturing the electroluminescent lamp 20, first, an ink in which a phosphor 28a obtained by activating zinc sulfide with copper and applying a moisture-proof coating on a base film 27 is dispersed in a resin 28b such as fluorine rubber is printed. Then, the light emitting layer 28 is formed to a thickness of 20 to 40 μm. Next, an ink in which a white dielectric powder such as barium titanate is dispersed in a resin is printed on the light emitting layer 28 to form the reflective insulating layer 29 with a thickness of 10 to 20 μm. Next, a conductive paste such as carbon ink is printed on the reflective insulating layer 29, and the back electrode 30 is formed to a thickness of 10 to 20 μm. Next, an insulating ink is printed on the back electrode 30, and the protective layer 31 is formed to a thickness of 10 to 20 μm. Thereafter, as shown in FIG. 2 (b), the slightly adhesive layer film 23 is peeled off from the thin transparent conductive film 26 to obtain an ultrathin electroluminescent lamp 20.

  As described above, the electroluminescent lamp 20 of the present embodiment uses the thin transparent conductive film 26 as the base material, and the thickness of the transparent electrode 25 can be reduced to several thousand mm. The lamp 20 can be provided, and the productivity can be greatly improved because there is no need to print the transparent electrode 25.

  In this embodiment, a transparent conductive film in which ITO is vapor-deposited is used as the material for the transparent electrode 25, but the same effect can be obtained by coating an organic polymer such as PEDOT or conductive powder such as ITO, antimony oxide, and zinc oxide. .

  In addition, when it is difficult to deposit or coat a transparent electrode on a thin film, a thin transparent film 24 made of PET or the like is previously attached to a fine adhesive film 23 in which a fine adhesive layer 22 is formed on a transparent film 21 made of PET or the like. Vapor deposition or coating may be applied in the form of an attached laminated film.

  According to the electroluminescent lamp of the present invention, by using a two-layer structure product of a slightly adhesive film and a thin transparent film as a base film, there is no problem in handling at the time of manufacture, and it can be easily adhered after manufacturing. Since the film can be peeled off from the thin transparent film, an ultra-thin electroluminescent lamp suitable for illumination of a key part of a cellular phone having excellent mechanical strength using the thin transparent film as a base material can be easily manufactured.

Sectional drawing of the principal part explaining the electroluminescent lamp of 1st Example of this invention, and its manufacturing method Sectional drawing of the principal part explaining the electroluminescent lamp of 2nd Example of this invention, and its manufacturing method Cross-sectional view of the main parts of a conventional electroluminescent lamp Cross-sectional view of the main part of another conventional electroluminescent lamp

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electroluminescent lamp of 1st Example of this invention 2 Transparent film 3 Slight adhesion layer 4 Slight adhesion film 5 Thin film transparent film 6 Base film 7 Transparent electrode 8 Light emitting layer 9 Reflective insulating layer 10 Back surface electrode 11 Protection layer 20 This invention Electroluminescent lamp 21 of the second embodiment 21 Transparent film 22 Slightly adhesive layer 23 Slightly adhesive film 24 Thin film transparent film 25 Transparent electrode 26 Transparent conductive film 27 Base film 28 Light emitting layer 29 Reflective insulating layer 30 Back electrode 31 Protective layer 40 Conventional Electroluminescent lamp 41 Release base 42 Transparent electrode layer 43 Light emitting layer 44 Reflective insulating layer 45 Back electrode 50 Other conventional electroluminescent lamp 51 Release base 52 Transparent insulating layer 53 Transparent electrode layer 54 Light emitting layer 55 Reflective insulation Layer 56 Back electrode

Claims (5)

  An electroluminescent lamp comprising a light emitting layer and a reflective insulating layer formed between a transparent electrode and a back electrode, wherein the base material supporting the transparent electrode is a thin film transparent film having a thickness of 10 to 35 μm. Luminescent lamp.   The electroluminescent lamp according to claim 1, wherein the transparent electrode is made of a transparent conductive material containing at least one of indium oxide, tin oxide, antimony oxide, zinc oxide, and a conductive polymer.   The electroluminescent lamp according to claim 2, wherein the transparent electrode is formed by any one of printing, vapor deposition, and coating.   A transparent electrode and light emission on a base film having a two-layer structure in which a thin adhesive film having a thickness of 10 to 35 μm is pasted on a slightly adhesive film having a thin adhesive layer formed on a transparent film having a thickness of 50 to 188 μm. A method of manufacturing an electroluminescent lamp, wherein a layer, a reflective insulating layer, a back electrode, and a protective layer are sequentially printed and formed, and after drying and solidifying, the fine adhesive film is peeled off from the thin film transparent film.   It has a two-layer structure in which a thin film transparent conductive film in which a transparent electrode is formed on a thin film transparent film having a thickness of 10 to 35 μm is attached to a thin adhesive film in which a thin adhesive layer is formed on a transparent film having a thickness of 50 to 188 μm. An electroluminescent lamp characterized in that a light emitting layer, a reflective insulating layer, a back electrode, and a protective layer are sequentially printed on a base film, and after drying and solidifying, the fine adhesive film is peeled off from the thin film transparent conductive film. Manufacturing method.

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