KR20060108060A - Electroluminescent lamp and electric apparatus with the same - Google Patents

Abstract

The present invention relates to an EL lamp and an electronic device having the same, and includes an EL structure provided in a predetermined space sealed by a flexible base film and a flexible sealing film, and an electromagnetic shielding layer provided on a lower surface of the base film. An EL lamp having an electromagnetic shielding layer.

The flexible EL lamp formed on the release sheet according to the present invention can also be provided with an electromagnetic shielding layer, thereby reducing the risk of users being exposed to electromagnetic waves.

EL lamp; EL Sheet

Description

EL lamp and electronic device having the same {ELECTROLUMINESCENT LAMP AND ELECTRIC APPARATUS WITH THE SAME}

1 illustrates a conventional mobile phone keypad configuration employing EL lamp.

2 is a cross-sectional view of the flexible EL lamp according to the present invention.

3 to 8 is a process chart related to the manufacturing process of EL lamp according to the present invention.

9 is a process chart for peeling an EL structure with an electromagnetic shielding layer according to an embodiment of the present invention from a release film.

*** Brief description of the main symbols in the drawings ***

10: release film 20: electromagnetic shielding layer

25 transparent or translucent non-conductive layer 30 base film

51: transparent electrode layer 52: EL layer

53: BUS BAR 54: dielectric layer

55: rear electrode layer 60: sealing film

56: connection window 70: adhesive layer

The present invention relates to an EL lamp and an electronic device having the same, and more particularly, to an EL lamp having a flexibility having an electromagnetic shielding layer and an electronic device having the same.

Although LED is mainly used as a light emitting device of a mobile phone keypad, since LEDs emit a point, the brightness is uneven, so an accessory such as a polarizing plate is required to even the brightness and a certain thickness is required. It is inconvenient to thicken. In order to overcome the shortcomings of the LED, an electroluminescent lamp (hereinafter, referred to as "EL lamp") has recently been used as a light emitting device of a mobile phone keypad. The reason why EL lamp is used as a light emitting device of a mobile phone keypad is because it emits surface light and has a uniform brightness and a thin sheet form, so it has an advantage of generating a compact mobile phone because of its thickness.

1 illustrates a conventional mobile phone keypad configuration employing EL lamp. A thin EL lamp 100 formed integrally with the metal dome 118 is formed on the circuit board PCB 116 on which the patterned switch 117 is formed. The EL lamp 100 shows a configuration in which the key top 110 is inserted into the lower portion of the front housing 112 in which a hole into which a button is inserted is placed with a predetermined space 113 to emit the EL lamp.

On the other hand, the EL lamp used for the keypad is operated by AC power, which causes various noises and malfunctions in other digital components in the mobile phone operated by DC 3.5V to 12V. In order to solve this problem, EL lamp using ITO film prevents noise or malfunction of portable device by installing noise layer on emitting surface and back surface or by printing anti-static electrode layer on the front surface.

However, the EL lamp illustrated in FIG. 1 generally has a structure in which EL lamps are screen-printed and laminated on an integrated release film. Thus, noise layers are disposed on the light emitting surface and the back surface of EL lamps laminated on an ITO film. I or there was a problem that can not print the antistatic electrode layer on the front. In other words, the EL lamp using the integrated release film uses a release film coated with silicone or wax, so when the electrode is printed, the crater may not be evenly printed or even completely printed even if the ink is not evenly printed. There was a problem that could not be commercialized as a product occurred. In addition, when the electromagnetic shielding electrode layer is formed on the release film using silver (Ag) paste or carbon paste, the thickness (5 to several tens of micrometers) is thick and the surface is uneven, which causes short circuit due to poor insulation with the front transparent electrode of EL lamp. There was a problem. In addition, to print the antistatic layer on the emitting surface, it is cumbersome and requires a long time because the release film is removed and the flexible EL lamp is attached to another fixture (such as a release film). There was a losing problem.

The present invention is to solve the above problems, by mixing the electrode body constituting the electromagnetic interference (EMI, Electromagnetic Interference) layer with the ink used as a protective film using a polymer conductive resin to have a static shielding characteristics release film An object of the present invention is to provide an EL lamp having an antistatic electrode body which can be sequentially printed on and an electronic device having the same.

The object of the present invention is an EL lamp having an electromagnetic shielding layer, characterized in that it comprises an EL structure provided in a predetermined space sealed with a flexible base film and a flexible sealing film and an electromagnetic shielding layer provided on the lower surface of the base film. Achievable by

Hereinafter, with reference to the accompanying drawings will be described in detail the advantages, features and preferred embodiments of the present invention.

2 is a cross-sectional view of the flexible EL lamp according to the present invention. An electromagnetic shielding layer 20 is formed on the silicon, fluorine, or wax-treated release film 10, and a transparent or translucent non-conductive layer 25 is provided thereon. The base film 30 is formed on the insulator layer 25, and the bus bar 53, the dielectric layer 54, and the rear surface which apply power to the transparent electrode layer 51, the EL layer 52, and the transparent electrode layer 51 are provided. An EL structure composed of an electrode layer 55 is provided. A sealing film 60 is provided to seal the EL structure, and a portion of the sealing film 60 is opened to form a connection window 56 for forming an electrode on the rear electrode layer 55. An adhesive layer 70 is provided on the sealing film 60 so that the EL lamp 100 according to the present invention can be easily attached to other external devices. Of course, the adhesive layer 70 may be provided selectively.

3 to 8 is a process chart related to the manufacturing process of EL lamp according to the present invention. Hereinafter, the EL lamp according to the present invention will be described with reference to FIGS. 3 to 8.

Electromagnetic shielding comprising a release film 10 coated with a material that facilitates peeling, such as silicon, fluorine, or wax, and a curing agent having an aqueous conductive polymer material on the coated release film 10. The layer forming material 20 is printed (FIG. 3). The printing thickness may be printed from 1 um to several um depending on the characteristics of the transparent electrode material. In addition, the coating method of the transparent electrode may be applied to various methods such as gravure in silk screen printing, roll screen printing, or bar coating.

As the aqueous conductive polymer material, polythiophene is a representative material used as a transparent electrode. Typical commercial materials include Agpa's EL-P3040, EL-P4020 or EL-P3020. Polythiophene of the product is a dark-based water-based ink has the characteristics of electrical conductivity. When the aqueous conductive polymer is coated with a low viscosity on the release film coated with a material such as silicone, fluorine or wax, which is easily peeled off, a crater phenomenon may appear due to the effect of surface tension, resulting in uneven printing. Will occur. On the contrary, when the aqueous conductive polymer material is coated with a high viscosity to solve the problem of surface tension on the release film coated with a material such as silicone, fluorine, or wax that facilitates peeling, the water may be printed on the release film. Since the thickness of the system conductive polymer material becomes thick, dark black becomes dark, which causes a decrease in luminance.

Therefore, in order to solve this problem, in the present invention, an electromagnetic shielding layer forming material is used by mixing an aqueous conductive polymer material with at least one material selected from urethane emulsion and acrylic emulsion. More specifically, the mixed material was formed to contain 50% to 98% of the aqueous conductive polymer material in the total weight percent of the electromagnetic shielding layer forming material and printed on the release film. When 98% or more of the aqueous conductive polymer material is contained, the electromagnetic wave shielding performance is excellent, but the printing characteristics are uneven. When it is contained below 50%, the resistance value is lowered and the electromagnetic wave shielding ability is lowered. As the urethane emulsion resin, np n8000 and n8500L series of nanopole manufacturers were used, and the tb 1500 series of tree bond manufacturers was used for acrylic emulsion resin.

As the curing agent, UV curing agent (UV curing agent (typically, CIBA-GEIGY IR 184 or D1173 curing agent), and thermal curing was used a thermosetting agent (hardening agent such as EPOXY, MELAMINE, ISOCYANATE). The curing agent was used in the range of 0.2% to 2% by weight percent of the total electromagnetic shielding layer forming material.

Next, the printed electromagnetic shielding layer forming material is cured (FIG. 4). 4 shows a process diagram using UV curing. In the case of UV curing, the amount of accumulated light was irradiated using a mercury lamp (80) to 600 mJ, and in the case of thermosetting, curing was performed at 100 ° C. to 140 ° C. for 5 minutes to 20 minutes.

Next, a transparent or translucent electrical insulator layer 25 is formed on the electromagnetic shielding layer 20 (FIG. 5). The transparent or translucent electrical non-conductive layer 25 printed an acrylic or polyurethane-based material by the silk screen method.

A flexible EL lamp structure 100 is formed on the electrical insulator layer 25 (FIGS. 6 to 8). Flexible EL lamp structure 100 is only known to those skilled in the art will be described briefly. The technology related to the flexible EL lamp structure 100 is disclosed in Japanese Patent Application Laid-Open Nos. 6-267657 and 1-41193, and is already used as a light emitting device under a mobile phone key button. Has become an application.

The EL structure 100 includes a transparent electrode layer 51, an EL layer 52, a bus bar 53 for applying power to the transparent electrode layer 51, a dielectric layer 54, and a rear surface stacked on the flexible base film 30. It consists of an electrode layer 55. In order to prevent the EL layer 52 from being oxidized, the transparent electrode layer 51, the EL layer 52, the bus bar 53, the dielectric layer 54 and the back electrode layer 55 are sealed together with the base film 30. The sealing film 60 is provided on the outside. The bus bar 53 is a terminal for applying external power to the transparent electrode layer 51, and external power is applied to the rear electrode layer 55 using the connection window 56. Separate connection window for the bus bar 53 should be provided, but not shown in the drawing. An adhesive layer 70 may be selectively provided on the sealing film 60 of the EL structure 100 to facilitate adhesion between the EL structure 100 and an external device. In the present invention, a UV type (cured by UV) acrylic resin was used as the base film 30, and a melamine resin was used as the sealing film 60. The commercial item of UV type acrylic resin is wu-1007w of the original Korean chemical manufacturer, and the commercial item of melamine resin is the cr18 of Asahi manufacturer.

9 is a process chart for peeling an EL structure with an electromagnetic shielding layer according to an embodiment of the present invention from a release film. In order to use the EL structure provided with the electromagnetic shielding layer proposed in the present invention, such as an electronic device, it must be peeled from the release film 10. As shown in FIG. 9, since the bloso, silicon, or wax is treated on the upper portion of the release film 10, the EL structure having the electromagnetic shielding layer 20 may be easily peeled off. Therefore, in use, after peeling the EL structure with an electromagnetic shielding layer from the release film 10, the adhesive layer 70 is attached to an external device or the like.

The electronic device to which the EL sheet having the metal dome according to the present invention is applied will be shown in the same manner as the embodiment of the conventional cellular phone shown in FIG. 1. That is, the electronic device to which the EL lamp 108 with the electromagnetic shielding layer according to the present invention is applied is integrated with the metal dome 118 on the circuit board PCB 116 on which the patterned switch 117 is formed. A thin EL lamp 108 formed is formed. The EL lamp 108 shows a configuration in which the key top 110 is inserted into the lower portion of the front housing 112 in which a hole into which a button is inserted is placed with a predetermined space 113 to emit the EL lamp. The configuration of the key top 110 and the housing 112 can be variously changed.

According to the present invention, the electromagnetic shielding layer can be provided on the front surface of the EL lamp formed on the release film, thereby easily shielding the electromagnetic waves from the EL lamp when applied to the electronic device. For example, when the EL lamp having the electromagnetic shielding layer according to the present invention is used as a keypad light emitting device of a mobile phone, it is possible to minimize the influence of electromagnetic waves on the human body by blocking the electromagnetic waves generated from the EL lamp and the PCB.

While preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only and it is understood that various changes and modifications may be made therein without departing from the spirit and scope of the following claims. You must lose.

For example, in the present invention, only the mobile phone is shown as an electronic device, but the present invention is not limited thereto. Of course, the electronic device may be used in any electronic device including an EL sheet having a metal dome adhered to the bottom of the button.

Claims (7)

EL structure provided in a predetermined space sealed with a flexible base film and a flexible sealing film; And EL lamp having an electromagnetic shielding layer characterized in that it comprises an electromagnetic shielding layer provided on the lower surface of the base film. The method of claim 1, EL lamp having an electromagnetic shielding layer, characterized in that further provided between the electromagnetic shielding layer and the EL structure is a transparent or semi-transparent electrical insulator layer. The method according to claim 1 or 2, The electromagnetic shielding layer is EL lamp having an electromagnetic shielding layer, characterized in that formed by mixing a water-based conductive polymer material and at least one material selected from urethane-based emulsion (emulsion) and acrylic emulsion. The method of claim 3, wherein EL lamp having an electromagnetic shielding layer, characterized in that the aqueous conductive polymer material is contained in an amount of 50% by weight to 98% by weight relative to the entire material forming the electromagnetic shielding layer. The method according to claim 1 or 2, EL lamp having an electromagnetic shielding layer, characterized in that the EL lamp is formed on one release film. The method of claim 2, The EL lamp having an electromagnetic shielding layer, characterized in that the electrical insulator layer is formed of an acrylic or polyurethane-based material. An electronic device comprising the EL lamp of any one of claims 1 to 6.

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