KR20060080530A - El metal dome sheet for backlight of keypad - Google Patents

Abstract

The present invention enables a modest switch operation during operation using an ITO-PEN or ITO-PET film of a multi-layer structure, an EL sheet capable of improving button press feel and durability of a keypad, and an EL sheet using the same. A metal dome sheet, wherein the EL sheet of the present invention has a structure of an EL sheet in which an EL layer for self-emission is formed on a transparent conductive film, wherein an ITO layer is formed on a base film, and a base is formed on the back of the base film. A transparent conductive film formed by laminating a film to form a multilayer structure, an EL layer formed by sequentially stacking a bus bar, a fluorescent layer, a dielectric layer, a back electrode layer, and a metal lead wire on the transparent conductive film, and the external impact and the EL layer. And a protective layer for protecting against pressure. According to the present invention, the thickness of the keypad can be minimized by a thin film, the contact of the contact can be made at the time of the switch operation, and the feeling of pressing can be improved, and the ink having different properties by the two-layer film It can prevent the occurrence of curl due to thermal deformation and shrinkage of the film which may occur when repeated printing and high temperature heat treatment.The second film is removed and the ESD protection layer of the silver electrode is formed to protect the device from static electricity. can do.

EL, Multi-layer Structure, Keypad, Mobile Phone, Backlight

Description

EL metal dome sheet for backlight of keypad

1 is a schematic cross-sectional view of a keypad for a general mobile communication terminal using an EL sheet;

2 is a schematic cross-sectional view of the structure of an EL sheet according to the prior art;

3 is a cross-sectional view showing the configuration of an EL metal dome sheet according to an embodiment of the present invention;

4 is a flowchart sequentially illustrating a method of manufacturing an EL metal dome sheet according to an embodiment of the present invention;

5 is a flowchart illustrating a manufacturing process of an EL sheet according to an embodiment of the present invention;

6 to 12 and 14 are sectional views showing the structure of the EL sheet according to the first to seventh embodiments of the present invention;

13 is a flowchart showing a manufacturing process of the EL metal dome sheet according to the seventh embodiment of the present invention;

Fig. 15 is a sectional view showing an EL metal dome sheet according to another embodiment of the present invention.

 ** Explanation of symbols for main parts of drawings **

1: EL metal dome sheet 10: EL sheet

20: metal dome sheet 60: adhesive sheet

100: transparent conductive film

110, 130, 160: PET or PEN film 170: TPU film

120: ITO layer 141: adhesive or adhesive layer

142: acrylic adhesive layer 143: silicone adhesive layer

150: release layer

200: EL layer 300: ESD protection layer

The present invention relates to a keypad backlight device used in a mobile communication terminal or a variety of electronic devices, and more specifically, it is possible to operate a modest switch in operation, EL metal dome sheet that can improve the button press feel and durability of the keypad It is about.

In general, the keypad is a switching device for signal generation used in an electronic device such as a mobile communication terminal or a remote control, and should have a separate backlight device for identifying keys such as numbers and letters at night or in a dark place.

Conventionally, as a keypad backlight device of a mobile communication terminal, a chip LED (Light Emitting Diode) is mounted on a printed circuit board of a mobile phone and a reflective film is installed on a metal dome sheet to diffuse light to the front so that the illumination of the keypad of a mobile phone or an electronic device is improved. It was constructed. However, since the LED is a point light source, it is reflected by a reflective film to illuminate by diffusing light only on the key top portion of the keypad. However, the LED has the advantage of identifying letters or numbers printed on the surface of the key button portion of the keypad. There is a problem of low visibility and high power consumption. In order to solve this problem, a backlight device of a keypad using an EL (Electroluminescent) sheet instead of an LED as a light source of a backlight of a mobile communication terminal has been developed.

1 and 2 show schematic cross-sectional views of the structure of a keypad for a general mobile communication terminal using an EL sheet and an EL sheet.

Referring to FIG. 1, the keypad is fastened to the front housing 11 and the front housing 11, and a base 12 having a protrusion for pressing a dome switch on the bottom of the key top and a key top on which numbers, letters, and figures are printed is formed. In the lower part of the keypad 12, the EL sheet 13 as a light emitting means, and a printed circuit board 14 having a metal dome switch and a fixed fixed contact terminal are provided. The conventional keypad of this structure is made by injecting silicon on both sides of the EL sheet 13 and integrating with the keypad 12. In this case, when the keypad is pressed, the pressure to press the metal dome switch array plate is increased, and there is a problem that a modest operation is impossible and the touch of the key button unit is dropped.

Referring to FIG. 2, the EL sheet 13 is formed of a phosphor layer 23, a dielectric layer 24, and a silver electrode layer 25 on a single-layer ITO-PET film substrate in which ITO is deposited 22 on a PET film 21. The protective layer 26 is laminated in order. Using the thick ITO-PET films 21 and 22 in the EL sheet structure as shown in FIG. 2, the entire EL sheet 13 is thickened, resulting in a drop in overall click feeling, and the EL sheet 13 itself. Due to the inherent noise and the effects of electrostatic discharge (hereinafter referred to as ESD), it is impossible to prevent the device from being destroyed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can produce a thin EL sheet as a whole by using a thin film of a multi-layer structure, while improving the feel of the key button portion and enabling a modest switch operation during operation. In addition, to provide an EL sheet and an EL metal dome sheet using the same that can improve the feeling when pressed.

Another object of the present invention is to prevent the curling (curling) occurring during the printing and high temperature heat treatment process using a thin film of a multi-layer structure, and an EL sheet capable of forming an ESD protection layer so as not to be affected by static electricity and It is an object to provide an EL metal dome sheet using the same.

In order to achieve the above object, in the structure of an EL sheet in which the EL sheet of the present invention is formed with an EL layer for self-luminescence on a transparent conductive film, an ITO layer is formed on the base film, and the back of the base film A transparent conductive film formed by laminating a base film to form a multilayer structure, an EL layer formed by sequentially stacking a bus bar, a fluorescent layer, a dielectric layer, a back electrode layer, and a metal lead wire on the transparent conductive film, and impacting the EL layer with an external impact. And a protective layer for protecting against pressure.

In addition, the EL sheet of the present invention is a transparent conductive film in which an ITO layer is laminated on a PEN or PET film, an ESD protection layer of a silver electrode formed to prevent static electricity on the back surface of the transparent conductive film, and a bus on the transparent conductive film. A bar, a fluorescent layer, a dielectric layer, a back electrode layer, and an EL layer formed by sequentially stacking a metal lead wire, and a protective layer for protecting the EL layer from external shock and pressure are characterized in that it is configured.

In addition, the EL metal dome sheet of the present invention is an EL sheet having the above structure, a metal dome sheet which is integrally bonded to the EL sheet on the lower surface of the EL sheet and has a hole formed at a position corresponding to the key button portion; A hemispherical metal dome seated in a hole and attached to a lower surface of the EL sheet, an adhesive sheet applied to the lower surface of the EL sheet for laminating the EL sheet and the metal dome sheet, and the EL sheet and the metal dome sheet And a release film attached to the bottom surface of the metal dome sheet to protect the top tape and the metal dome sheet for lamination.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention;

3 is a cross-sectional view showing the configuration of an EL metal dome sheet according to the present invention, FIG. 4 is a flowchart showing a process for manufacturing an EL metal dome sheet, and FIG. 5 shows a process for manufacturing an EL sheet. Flowchart.

Referring to FIG. 3, the EL metal dome sheet 1 according to the present invention includes an EL sheet 10, a metal dome sheet 20, a metal dome 30, and a release film 40 as shown in (a). The EL sheet 10 and the metal dome sheet 20 are laminated by an adhesive sheet 60 and a top tape 30.

As shown in (b), the EL sheet 10 is a transparent conductive material in which an ITO 120 is deposited or paste printed onto a film 110 such as polyethylene naphthalate (PEN), polyethylene terephthalate (PET), or thermoplastic polyurethane (TPU). Protects the EL layer 200 in which a bus bar 210, a fluorescent layer 220, a dielectric layer 230, a back electrode layer 240, and a metal lead layer 250 are stacked on the film 100. It has a structure sealed with the layer 260.

Generally, the EL sheet uses a transparent conductive film having an ITO layer formed on a PET film, but in the present invention, a transparent conductive film having an ITO layer formed on a PEN film having a thin thickness and excellent durability and film characteristics is used. .

The metal dome sheet 20 has a hole 50 through which the metal dome 30 can be inserted, and a hemispherical metal dome 30 serving as a switch is seated in the hole 50, and a medal dome The release film 40 for protecting the sheet 20 is laminated on the bottom surface.

Here, the metal dome sheet 20 is a thin sheet-shaped insulating sheet is a white sheet which is diffusely reflected by a thin plastic film coated on the top, the metal dome 30 is a hemispherical shape made of a material of stainless steel, The film 40 is a protective film for protecting the adhesive surface of the metal dome sheet 20.

As described above, the EL metal dome sheet 1 of the present invention is formed by laminating the release film 40 and the metal dome sheet 20 and laminating the EL sheet 10 on the metal dome sheet 20.

As shown in FIG. 4, the manufacturing process of the EL metal dome sheet 1 of the present invention is a process of manufacturing the EL sheet 10 largely (S11) and the EL sheet 10 and the first cut and holes are formed. A process S12 of manufacturing the metal dome sheet 20 and a process of manufacturing the EL metal dome sheet 1 by stacking the EL sheet and the metal dome sheet and mounting the metal dome are performed (S13 to S16).

Referring to FIG. 4, the process of manufacturing the EL sheet 10 includes forming a transparent conductive film, a bus-bar, a fluorescent layer, a dielectric layer, a back electrode layer, and a metal lead wire on the transparent conductive film. Laminating in order to form an EL layer, a step of completely encapsulating the formed EL layer with moisture and external impact, and a step of applying an adhesive. Detailed description of the manufacturing process of this EL sheet 10 will be described in detail in the following embodiments.

In order to manufacture the EL metal dome sheet 1 using the above-described EL sheet 10, the EL sheet 10 and the first cut metal dome sheet 20 are prepared (S11 and S12). At this time, the metal dome sheet 20 has a hole 50 for attaching the metal dome 30 by primary cutting.

Next, the EL sheet 10 and the metal dome sheet 20 are laminated using the adhesive sheet 60 and the top tape 70, and the holes 50 of the metal dome sheet 20 in which the EL sheet 10 is laminated are laminated. The metal dome 30 is mounted on the metal dome 30, and the metal dome 20 is fixed to the bottom surface of the EL sheet 10 by the top tape 70 (S13 and S14).

Then, after attaching the release film 40 to the back of the metal dome sheet 20, the outline is cut using the drawings of the finished product to be utilized in the mobile communication terminal or electronic device of the desired model (S15, S16).

The completed EL metal dome sheet 1 can be used as a keypad backlight of these by being installed on various models of mobile communication terminals or printed circuit boards of electronic devices.

On the other hand, the EL sheet integrally formed in the metal dome sheet according to the present invention can be manufactured according to the procedure shown in Fig. 5 on the conductive film as shown in Fig. 5.

Referring to FIG. 5, the present invention forms a thin transparent conductive film having a predetermined thickness by depositing ITO on a thin film having a multilayer structure or by printing an ITO paste and then forming an EL layer on the transparent conductive film.

As the film used in the present invention, a polyethylene naphthalate (PEN) film or a polyethylene terephthalate (PET) film may be used, but it is preferable to use a PEN film having a thin thickness and excellent durability and film characteristics as compared to the PET film.

Specifically, after forming an electrically conductive film by depositing an ITO layer on the PEN film, the conductive paste is printed and dried to form a bus bar (BUS-BAR) to prevent loss due to high resistance (S21, S22). .

After forming the bus bar (BUS-BAR), the fluorescent ink prepared by mixing the phosphor and binder in a ratio of about 55 to 70% by weight of silk screen printing, and then hot-air dried at about 60 ~ 150 ℃ for about 5 to 10 minutes A fluorescent layer is formed (S23). At this time, the color emitted is changed according to the color of the phosphor to be mixed, and when drying, the thickness of the fluorescent layer is about 30 ~ 50㎛.

Subsequently, a dielectric layer is formed on the fluorescent layer (S24). The dielectric layer is silk-screen printed dielectric ink prepared by mixing BaTiO ₃ with a binder at a ratio of about 50 to 70 wt%, followed by hot air drying at 60 to 150 ° C. for 5 to 10 minutes to form a thickness of about 15 to 30 μm. It is. At this time, the drying process may be UV drying depending on the type of ink.

A back electrode layer using carbon paste is formed on the dielectric layer, and metal lead wires for electrical application are formed on the back electrode layer using silver (Ag) paste (S25 and S26). At this time, the drying process is performed after the screen printing process.

Although not shown in the drawing, a process of forming an EMI shielding layer between the two insulating layers may be added by adding an insulating layer on the back electrode layer, forming an EMI shielding layer, and then forming an insulating layer if necessary.

As described above, the ink layers for forming the EL layer are formed in the order of the fluorescent layer, the dielectric layer, the back electrode layer, and the metal lead wire, and after the ink layers are completely dried, the PVC layer or UV urethane (UV URETHANE) is completely covered. ) Ink, urethane acrylic / acrylic monomer (URETHANE ACRYLATE / ACRYLATE MONOMER) ink is applied to form a protective layer (S27). At this time, when the protective layer is formed, it is preferable to perform hot air drying or ultraviolet (UV) drying for about 5 to 20 minutes at a temperature of 90 to 150 ° C. after the silk screen printing process. In this case, the hole for the terminal treatment is left empty.

Finally, after the pressure-sensitive adhesive layer is formed, the terminal and the guide hole are processed (S28 and S29). As described above, the EL sheet 10 completed through the above process is laminated with the metal dome sheet 20 according to the procedure shown in FIG. 4 to finally complete the EL metal dome sheet 1.

Meanwhile, the transparent conductive film for manufacturing the EL sheet may use a single layer structure film, but in the present invention, a thin film is used in the form of a multi-layer film in order to improve touch and properties. It is done. In the case of using the multilayered layer structure according to the present invention, it is possible to easily apply a PEN film having a thin thickness and excellent durability and film properties.

 In other words, the present invention uses a thin film of PEN film because the durability, click feeling, thickness, etc. are very important in order to be mounted on a keypad for a mobile phone, and also prevents curling (curling) that may occur during the process due to the thin film. In order to achieve a multi-layered layer structure. It is also an improvement to form an ESD protection layer to minimize the effects of external static electricity on a single layer of thin film.

Hereinafter, the present invention will be described in more detail with reference to the first to seventh embodiments.

[First Embodiment]

The first embodiment of the present invention improves the transparent conductive film into a two-layer structure, and the EL layer is formed on an ITO-PEN or ITO-PET film having a two-layer structure according to the first embodiment. The cross-sectional structure of the sheet is as shown in FIG.

Referring to FIG. 6, the conductive film 100 used in the first embodiment of the present invention is a PEN or PET film 110, 130 having a thickness of 5 μm to 75 μm, or an adhesive or adhesive 141 having a thickness of 5 μm to 75 μm. After forming a two-layer structure by attaching to form an ITO layer 120 by depositing or paste printing ITO on the upper base film 110, the EL layer 200 according to the procedure shown in FIG. To form the EL sheet 10.

Here, the adhesive belongs to the category of the adhesive in a broad sense, but has specific characteristics in comparison with other adhesives. In other words, the general adhesive has a fluidity as compared to the adhesive in the liquid state after the certain process pulls the adherent and solidified and bonded.

In addition, the EL layer 200 is a bus bar (BUS-BAR) 210 formed by printing and drying the conductive paste on the base film 110 on which the ITO layer 120 is formed, and the fluorescent ink is dried after silk screen printing. After the fluorescent layer 220 and the dielectric ink are silk screen printed, the dielectric layer 230 is dried and formed to a thickness of about 15 to 30 μm, the formed back electrode layer 240 using carbon paste, and silver (Ag) on the back electrode layer. A metal lead wire 250 formed using a paste. In order to protect the EL layer 200 formed in the order of the fluorescent layer 220, the dielectric layer 230, the back electrode layer 240, and the metal lead wire 250, a PVC sol or the like may be completely covered. The UV URETHANE ink and the urethane acrylic / acrylate monomer ink are applied to form a protective layer 260.

As shown in FIG. 6, the structure of the first embodiment includes a first base film 130 having a thickness of 5 μm to 75 μm, an adhesive or an adhesive layer 141 having a thickness of 5 μm to 75 μm, and 5 μm to 75 μm. The ITO layer 120 is deposited on the basic film 110 having a thickness of about 100 μm to form a transparent conductive film 100. The silver electrode 210, the fluorescent layer 220, and the dielectric layer 230 are formed on the transparent conductive film 100. ), The EL layer 200 in which the rear electrode layer 240 and the metal lead wires 250 are stacked in this order is formed, and a protective layer 260 is formed outside the EL layer 200.

As such, when the EL layer 200 is formed on the two-layer conductive film 100 composed of the base film and the first base film to produce the EL sheet and the EL metal dome sheet, an adhesive layer or an adhesive is formed between the films. The layer 141 acts as a buffer so that the cushion and the click feeling are excellent, and the external shock is absorbed to obtain the excellent operation durability.

Second Embodiment

The second embodiment of the present invention is to improve the transparent conductive film to a two-layer structure so as to support and reinforce the EL layer in the process of forming the EL layer to prevent the thermal deformation and shrinkage of the EL sheet. The cross-sectional structure of the EL sheet in which the EL layer is formed on the ITO-PEN or ITO-PET film having the two-layer structure according to the second embodiment is as shown in FIG.

Referring to FIG. 7, the conductive film 100 used in the second embodiment of the present invention is a two-layer in which a film 110 having a thickness of 5 μm to 75 μm and a film 160 having a thickness of 10 μm to 125 μm are laminated. It consists of a film. A base film 110 coated with a silicone mold release agent 150 is formed on a back surface of a PEN or PET film having a thickness of 5 μm to 75 μm, and an acrylic pressure sensitive adhesive having a thickness of 10 μm to 50 μm is formed on the base film 110 having a release treatment. The second base film 160 having a thickness of about 10 μm to 125 μm to which the 142 is applied is laminated, and the ITO layer 120 is formed by depositing or paste printing ITO on the base film 110.

The EL layer 200 is formed in the same manner as in the above-described embodiment, and the structure of the second embodiment has a second base film 160 having a thickness of 10 µm to 125 µm, as shown in FIG. An ITO layer 120 is deposited on the acrylic adhesive 142 having a thickness of 10 μm to 50 μm and the basic film 110 having a thickness of 5 μm to 75 μm coated with the silicone release agent 150 to form a transparent conductive film 100. And an EL layer 200 in which a silver electrode 210, a fluorescent layer 220, a dielectric layer 230, a back electrode layer 240, and a metal lead wire 250 are sequentially stacked on the transparent conductive film 100. The protective layer 260 is formed outside the EL layer 200.

When the EL sheet is formed by forming the EL layer 200 on the two-layer conductive film 100 as described above, the ink having different properties in the structure of the conventional single ITO-PEN or ITO-PET film is repeatedly printed and subjected to high temperature heat treatment. In this case, curl generation due to thermal deformation and shrinkage of the film, which may occur when the second base film 160 serves as a support layer, may be prevented.

Third Embodiment

According to the third embodiment of the present invention, the ITO-PEN or ITO-PET film is further laminated by the silicone-based release agent and the acrylic adhesive on the back side of the ITO-PEN or ITO-PET film having a transparent conductive film attached with an adhesive or an adhesive. It is excellent in cushioning and clicking feeling, and has been improved to a three-layer structure to prevent the EL sheet from thermally deforming and shrinking by supporting and reinforcing the EL layer formation process. The cross-sectional structure of the EL sheet in which the EL layer is formed on the ITO-PEN or ITO-PET film having the structure is as shown in FIG.

Referring to FIG. 8, the conductive film 100 used in the third embodiment of the present invention may be a PEN or PET film 110 and 130 having a thickness of 5 μm to 25 μm, or an adhesive or adhesive 141 having a thickness of 5 μm to 75 μm. After the base film 110 and the first base film 130 is attached to form a two-layer, and the silicone-based release agent 150 is coated on the back surface of the first base film 130, the release-treated first base The film 130 is laminated with a second base film 160 having a thickness of 10 μm to 125 μm coated with an acrylic adhesive 142 having a thickness of 10 μm to 50 μm, and ITO is deposited or paste printed on the base film 110. Thus, the ITO layer 120 is formed.

The EL layer 200 is formed in the same manner as in the above-described embodiment, and the structure of this third embodiment has a second base film 160 having a thickness of 10 μm to 125 μm, as shown in FIG. 8, and 10. An acrylic adhesive 142 having a thickness of 50 μm to 50 μm, a first base film 130 having a thickness of about 5 μm to 25 μm coated with a silicone release agent 150, and an adhesive or adhesive layer having a thickness of about 5 μm to 75 μm 141 and the ITO layer 120 are stacked on the base film 110 having a thickness of about 5 μm to 25 μm to form a transparent conductive film 100, and the silver electrode 210 on the transparent conductive film 100. And an EL layer 200 in which the fluorescent layer 220, the dielectric layer 230, the back electrode layer 240, and the metal lead wire 250 are sequentially stacked, and a protective layer 260 is formed outside the EL layer 200. Formed structure.

When the EL sheet is formed by forming the EL layer 200 on the three-layer conductive film 100 as described above, the ink having different properties in the structure of the conventional single ITO-PEN or ITO-PET film is repeatedly printed and subjected to high temperature heat treatment. In this case, curling due to thermal deformation and shrinkage of the film may be prevented by the second film 130 acting as a reinforcing layer. In addition, when the EL layer 200 is formed on the three-layer conductive film 100 to produce the EL sheet and the EL metal dome sheet, the adhesive or the adhesive layer 140 acts as a buffer between the films to provide a cushioning and It is excellent in the feeling of a click, and can absorb the external shock, and can obtain the effect excellent in operation durability.

[Example 4]

The fourth embodiment of the present invention is a simpler process by removing the release layer treated on the base film using a silicone pressure-sensitive adhesive as the pressure-sensitive adhesive for laminating the base film and the second base film in the above-described second embodiment. As a structure for the transparent conductive film in the form of a two-layer that can be produced, the cross-sectional structure of the EL sheet according to the fourth embodiment is as shown in FIG.

Referring to FIG. 9, the conductive film 100 used in the fourth embodiment of the present invention is a two-layer in which a film 110 having a thickness of 5 μm to 75 μm and a film 160 having a thickness of 10 μm to 125 μm are laminated. It consists of a film. The base film 110 having a thickness of 5 μm to 75 μm is laminated with the second base film 160 having a thickness of about 10 μm to 125 μm to which the silicone pressure sensitive adhesive 143 is applied to the base film 110 having a thickness of 5 μm to 75 μm. The ITO layer 120 is formed by depositing or paste printing ITO on the 110.

The EL layer 200 is formed in the same manner as in the above-described embodiment, and the structure of the fourth embodiment has a second base film 160 having a thickness of 10 µm to 125 µm, as shown in FIG. A silicon conductive adhesive 143 having a thickness of 5 μm to 100 μm and an ITO layer 120 are stacked on the base film 110 having a thickness of 5 μm to 75 μm to form a transparent conductive film 100, and the transparent conductive film 100 ), An EL layer 200 in which a silver electrode 210, a fluorescent layer 220, a dielectric layer 230, a back electrode layer 240, and a metal lead line 250 are sequentially stacked is formed, and the EL layer 200 is formed. The protective layer 260 is formed on the outside.

As described above, when the EL sheet is formed by forming the EL layer 200 on the two-layer thin conductive film 100, the structure and the manufacturing process are simple and may occur when the ink having different properties is repeatedly printed and subjected to high temperature heat treatment. The occurrence of curl due to thermal deformation and shrinkage of the film may be prevented by the second base film 160 serving as a reinforcing role as the supporting layer.

[Example 5]

In the fifth embodiment of the present invention, in the third embodiment described above, by removing the release layer treated on the first base film using a silicone pressure-sensitive adhesive as an adhesive for laminating the first base film and the second base film, As a structure for the transparent conductive film of the three layer structure which can be manufactured by a simpler process, the cross-sectional structure of the EL sheet according to the fifth embodiment is as shown in FIG.

Referring to FIG. 10, the conductive film 100 used in the fifth embodiment of the present invention is a PEN or PET film 110, 130 having a thickness of 5 μm to 25 μm, or an adhesive or adhesive 141 having a thickness of 5 μm to 75 μm. 10 μm having a silicon adhesive 143 having a thickness of 5 μm to 100 μm applied to the bottom surface of the first base film 130 by being attached to the base film 110 and the first base film 130. To 125 μm thick second base film 160 is laminated, and the ITO layer 120 is formed by depositing or paste printing ITO on the base film 110.

The EL layer 200 is formed in the same manner as in the above-described embodiment, and the structure of this fifth embodiment is, as shown in Fig. 8, the second base film 160 having a thickness of 10 μm to 125 μm, and 5 A silicone-based adhesive 143 having a thickness of 100 μm to 100 μm, a first base film 130 having a thickness of 5 μm to 25 μm, an adhesive or adhesive layer 141 having a thickness of 5 μm to 75 μm, and 5 μm to 25 μm The ITO layer 120 is stacked on the base film 110 having a thickness to form a transparent conductive film 100, and the silver electrode 210, the fluorescent layer 220, and the dielectric layer 230 are formed on the transparent conductive film 100. In addition, the EL layer 200 in which the back electrode layer 240 and the metal lead wires 250 are stacked in this order is formed, and a protective layer 260 is formed outside the EL layer 200.

As such, when the EL sheet is formed by forming the EL layer 200 on the three-layer conductive film 100, the structure and the manufacturing process may be simple, and may occur when repeated printing and high temperature heat treatment of inks having different properties. The occurrence of curl due to thermal deformation and shrinkage of the film may be prevented by the second film 130 acting as a reinforcing layer. In addition, when the EL layer 200 is formed on the three-layer conductive film 100 to produce the EL sheet and the EL metal dome sheet, the pressure-sensitive adhesive layer 140 acts as a buffer between the films, thereby providing a feeling of cushioning and clicking. This effect is excellent in absorbing external shocks, and the effect of excellent operation durability can be obtained.

[Example 6]

In the sixth embodiment of the present invention, in a transparent conductive film having a two-layer structure, an ITO-PEN or ITO-PET film having a pressure-sensitive adhesive layer is added to a TPU film to support and reinforce the EL layer forming process. By preventing the EL sheet from being thermally deformed and shrunk and improving the elasticity of the TPU film so as to improve the feeling of click and absorb external impact, the transparent structure of the two-layer structure using the TPU film according to the sixth embodiment The cross-sectional structure of the EL sheet in which the EL layer is formed on the conductive film is as shown in FIG.

Referring to FIG. 11, the conductive film 100 used in the sixth embodiment of the present invention has a PEN or PET film of 10 μm to 125 μm thick laminated on a TPU film 170 having a thickness of 5 μm to 100 μm. Consists of a layer film. A base film 170 coated with a silicone mold release agent 150 is formed on a back surface of a TPU film having a thickness of 5 μm to 100 μm, and an acrylic pressure sensitive adhesive 142 having a thickness of 10 μm to 50 μm is formed on the base film 170 having a release treatment. The second base film 160 having a thickness of about 10 μm to 125 μm coated thereon is laminated, and the ITO layer 120 is formed by depositing or pasting ITO on the base film 170.

The EL layer 200 is formed in the same manner as in the above-described embodiment, and the structure of this second embodiment has a second base film of PEN or PET film having a thickness of 10 μm to 125 μm, as shown in FIG. 11. The ITO layer 120 is formed on the base film 170 of the TPU film having a thickness of about 5 μm to 100 μm coated with the acrylic adhesive 142 having a thickness of 10 μm to 50 μm and the silicone release agent 150. The transparent conductive film 100 is formed to be deposited, and the silver electrode 210, the fluorescent layer 220, the dielectric layer 230, the back electrode layer 240, and the metal lead wire 250 are sequentially formed on the transparent conductive film 100. A stacked EL layer 200 is formed, and a protective layer 260 is formed outside the EL layer 200.

When the EL sheet is formed by forming the EL layer 200 on the two-layer conductive film 100 as described above, the ink having different properties in the structure of the conventional single ITO-PEN or ITO-PET film is repeatedly printed and subjected to high temperature heat treatment. In this case, curl generation due to thermal deformation and shrinkage of the film, which may occur when the second base film 160 serves as a support layer, may be prevented. In addition, the TPU (Thermoplastic Urethane) film has excellent flexibility and has a good click feeling, and can absorb external shocks and greatly improve operation durability.

[Example 7]

According to the seventh embodiment of the present invention, after forming the transparent conductive film and the EL layer using the two-layer according to the fourth embodiment, the silicon adhesive-treated second base film laminated on the base film is removed, and the base film 12. A structure of a transparent conductive film having an ESD protection layer formed thereon for preventing static electricity on its back surface, wherein the cross-sectional structure of the EL sheet according to the seventh embodiment is as shown in FIG.

 12, in the seventh embodiment of the present invention, an ESD protection layer 300 of a silver (Ag) electrode for preventing static electricity is formed on a base film 110 of PEN or PET film having a thickness of 5 μm to 75 μm. do. That is, in the structure of the seventh embodiment, as shown in FIG. 12, the ESD protection layer 300 of the silver electrode is formed on the rear surface of the base film 110, and the ITO layer 120 is formed on the base film 110. The transparent conductive film 100 is laminated to form a silver electrode, and the silver electrode 210, the fluorescent layer 220, the dielectric layer 230, the back electrode layer 240, and the metal lead wire 250 are sequentially formed on the transparent conductive film 100. A stacked EL layer 200 is formed, and a protective layer 260 is formed outside the EL layer 200.

FIG. 13 is a flowchart sequentially showing a method of manufacturing an EL metal dome sheet having an ESD protection layer according to the seventh embodiment.

Referring to FIG. 13, the EL sheet 10 according to the seventh embodiment first prepares a base film of a thin PEN or PET film and a second heat treated or unheated base film to prepare a transparent conductive film. 2 Base film cross-section is applied to the silicon adhesive 5㎛ to 100㎛ thickness, and the second base film is adhesively treated, and then the base film and the silicone adhesive-treated second base film are laminated while controlling tension and line speed to A film is formed (S31 to S33).

A two-layer transparent conductive film is prepared by coating or paste printing ITO on the base film of the transparent conductive film on which the base film and the second base film are laminated (S34). An EL layer is formed on the transparent conductive film on which the ITO layer is formed by forming an EL layer according to the above-described process of FIG. 5 (S35).

After the metal dome sheet is laminated by laminating the metal dome sheet in accordance with the above-described process of FIG. 4 to the EL sheet by such a process, the second base film of the two-layer film is removed (S36 to S38). On the base film from which the second base film is removed, a silver electrode for preventing ESD is printed (S39). In this case, after removing the second base film and printing the silver electrode for preventing ESD (S38 and S39), the metal dome sheet may be laminated to seat the metal dome (S36 and S37).

 After the ESD protection layer is formed, the release film for protecting the sheet is laminated on the back of the metal dome sheet on which the metal dome is seated, and finally, the outline is drawn using the drawings of the finished product to be used for a mobile terminal or electronic device of a desired model. Cutting to complete the EL metal dome sheet (S40, S41).

That is, the EL sheet of the EL metal dome sheet manufactured by the above process may be formed of the transparent conductive film 100 having the ITO layer 120 formed on the thin base film 110 having a thickness of 5 μm to 75 μm, as shown in FIG. 12. The ESD protection layer 130 for preventing static electricity is formed on the back surface of the EL layer 200 and the base film 110 formed on the transparent conductive film 100.

The EL sheet in which the ESD protection layer is formed, as in the seventh embodiment, removes the second base film laminated on the first base film in the same structure as in the fifth embodiment, in addition to the fourth embodiment, to the rear surface of the first base film. ESD layers may also be formed.

After forming the transparent conductive film and the EL layer by using the three layer according to the fifth embodiment, the silicon adhesive-treated second base film laminated on the first base film is removed, and the static electricity is formed on the back surface of the first base film. As a structure for a transparent conductive film having an ESD protection layer formed thereon, the structure is shown in FIG. 14.

Referring to FIG. 14, in the structure of the seventh exemplary embodiment in which an ESD protection layer is formed using three layers, an ITO layer 120 is formed on a thin base film 110 having a thickness of 5 μm to 25 μm, and the base film 110 is formed. The first base film 130 having a thickness of 5 μm to 25 μm is attached to the rear surface of the substrate by an adhesive or an adhesive layer 141, and the first base film (see 143 and 160 of FIG. 10) removed from the silicon adhesive is removed. The back surface of the base film 130 forms a structure in which the ESD protection layer 300 printed with silver electrodes is formed.

When the EL layer is formed on the conductive film formed by using a thin film in the form of a two-layer or three-layer as in the seventh embodiment, and then manufacturing the EL sheet and the EL metal dome sheet using the same, the conventional single layer ITO In the PET film structure, curling due to thermal deformation and shrinkage of the film, which may occur when repeated printing and high-temperature heat treatment of inks having different properties, can be prevented by the second base film reinforcing the supporting layer. . In addition, since the release process is not performed on the base film of the thin film, the process of manufacturing the transparent conductive film becomes simpler, and an ESD protection layer is formed on the base film from which the second base film is removed, thereby protecting the device by static electricity. Thin EL sheets and EL metal dome sheets can be produced.

15 is an exploded cross-sectional view showing the configuration of the EL metal dome sheet according to the embodiment of the present invention.

Referring to FIG. 15, the EL metal dome sheet of the present invention includes an EL sheet 10, a metal dome sheet 20, a metal dome 30, a release film 40, and an EL sheet 10. The metal dome sheet 20 is laminated by the adhesive sheet 60 and the top tape 70.

In this case, the adhesive sheet 60 is formed by applying an adhesive to the protective layer 260 of the EL sheet 10, and as shown, a hole formed in the metal dome sheet 20 to seat the metal dome 30. The space 61 is formed at the same position to coincide with 50. That is, in the process of manufacturing the EL sheet and applying the adhesive, the adhesive is applied to a portion other than the hole 50 on which the metal dome is seated, so that the same space 61 as the hole 50 of the metal dome sheet is formed.

By forming the space 61 in the adhesive sheet 60 in this way, the click feeling is improved when the keypad is operated, and the thickness of the metal dome sheet 20 is increased, thereby improving the feeling of clicking. The thickness of the metal dome sheet may be formed to 0.06mm to 0.2mm.

As described above, according to the present invention, the EL sheet, which is a self-luminous body, is integrated with the metal dome sheet and formed into a structure in which the metal dome is seated on the cut metal dome sheet, thereby making it uniform and brighter than conventional LEDs. The keypad can be illuminated. And overall, the thickness of the keypad can be minimized to enable the modest operation of the contact point during switch operation, and soften the touch when the keypad is pressed.

In particular, the click feeling can be further improved by applying an adhesive for laminating the EL sheet and the metal dome sheet to a part except the position where the metal dome is seated.

In addition, to form a transparent conductive film, a thin film such as PEN, PET, or TPU is formed in two layers to improve cushioning and clicking feeling, absorb external shocks, and serve as a support layer when manufacturing an EL sheet. By the base film, it is possible to prevent the occurrence of curl due to thermal deformation and shrinkage of the film, which may occur when repeated printing and high temperature heat treatment of inks having different properties.

In addition, after the EL sheet is formed using the multilayered layer, the second base film serving as the local area can be removed, and the ESD protection layer of the silver electrode can be formed to protect the device from static electricity.

Claims (12)

In the structure of an EL sheet in which an EL layer for self-luminescence is formed on a transparent conductive film, A transparent conductive film having an ITO layer formed on the base film, and having a base film laminated on a rear surface of the base film to form a multilayer structure; and An EL layer formed by sequentially stacking a bus bar, a fluorescent layer, a dielectric layer, a back electrode layer, and a metal lead line on the transparent conductive film; And And a protective layer for protecting the EL layer from external impact and pressure. The method of claim 1, wherein the transparent conductive film, An ITO layer is laminated on a base film composed of a polyethylene naphthalate (PEN) film or a polyethylene terephthalate (PET) film having a thickness of 5 μm to 75 μm, and an adhesive or adhesive layer having a thickness of 5 μm to 75 μm on the back of the base film. And a base film composed of a polyethylene naphthalate (PEN) film or a polyethylene terephthalate (PET) film having a thickness of 5 µm to 75 µm by lamination. The method of claim 1, wherein the transparent conductive film,  The ITO layer is laminated on a base film composed of PEN or PET film having a thickness of 5 μm to 75 μm, and a silicone-based release agent is coated on the back side of the base film, and 10 μm to 50 on the back side of the release film. An EL sheet comprising a base film composed of a PEN or PET film having a thickness of 10 µm to 125 µm to which an acrylic pressure-sensitive adhesive having a thickness is applied is laminated. The method of claim 1, wherein the transparent conductive film, An ITO layer is laminated on a base film composed of 5 μm to 75 μm thick PEN or PET film, and a back side of the base film is a PEN having a thickness of 10 μm to 125 μm with a silicone adhesive of 5 μm to 100 μm thick or An EL sheet comprising a base film composed of a PET film laminated. The method of claim 1, wherein the transparent conductive film, An ITO layer is laminated on a base film composed of a PEN or PET film having a thickness of 5 μm to 25 μm, and a PEN having a thickness of 5 μm to 25 μm is formed on the back of the base film by an adhesive or adhesive having a thickness of 5 μm to 75 μm. Or a first base film consisting of a PET film is attached, a silicone-based release agent is coated on the back of the first base film, the acrylic adhesive of 10㎛ to 50㎛ thickness on the back of the release-treated first base film An EL sheet characterized in that the second base film composed of a PEN or PET film having a thickness of 10 μm to 125 μm applied is laminated. The method of claim 1, wherein the transparent conductive film, An ITO layer is laminated on a base film composed of a PEN or PET film having a thickness of 5 μm to 25 μm, and a PEN having a thickness of 5 μm to 25 μm with an adhesive or an adhesive having a thickness of 5 μm to 75 μm on the back of the base film. Or a first base film made of PET film is attached, and a second base made of PEN or PET film having a thickness of 10 μm to 125 μm coated with a silicone pressure-sensitive adhesive having a thickness of 5 μm to 100 μm on a back surface of the first base film. The film is laminated | stacked and comprised, The EL sheet characterized by the above-mentioned. The method of claim 1, wherein the transparent conductive film, The ITO layer is laminated on a base film composed of 5 μm to 100 μm thick TPU (Thermoplastic Urethane) film, and a silicone-based release agent is coated on the back side of the base film, and 10 μm on the back side of the release-treated base film. An EL sheet comprising a base film composed of a PEN or PET film having a thickness of 10 µm to 125 µm to which an acrylic pressure-sensitive adhesive having a thickness of 50 µm is applied is laminated. In the structure of an EL sheet in which an EL layer for self-luminescence is formed on a transparent conductive film, A transparent conductive film having an ITO layer laminated on a PEN or PET film having a thickness of 5 μm to 75 μm; and An electrostatic discharge (ESD) prevention layer of a silver (Ag) electrode formed to prevent static electricity on a rear surface of the transparent conductive film; An EL layer formed by sequentially stacking a bus bar, a fluorescent layer, a dielectric layer, a back electrode layer, and a metal lead line on the transparent conductive film; And And a protective layer for protecting the EL layer from external impact and pressure. In the structure of an EL sheet in which an EL layer for self-luminescence is formed on a transparent conductive film, An ITO layer is laminated on a base film having a thickness of 5 μm to 25 μm, and a back side of the base film is formed of a PEN or PET film having a thickness of 5 μm to 25 μm by an adhesive or adhesive having a thickness of 5 μm to 75 μm. 1 transparent conductive film with a base film; And, An electrostatic discharge (ESD) prevention layer of a silver (Ag) electrode formed to prevent static electricity on a rear surface of the transparent conductive film; An EL layer formed by sequentially stacking a bus bar, a fluorescent layer, a dielectric layer, a back electrode layer, and a metal lead line on the transparent conductive film; And And a protective layer for protecting the EL layer from external impact and pressure. An EL sheet composed of any one of claims 1 to 9; and A metal dome sheet which is integrally bonded to the EL sheet on the lower surface of the EL sheet and has a hole formed at a position corresponding to the key button portion; A hemispherical metal dome seated in the hole and attached to the lower surface of the EL sheet; An adhesive sheet applied to a lower surface of the EL sheet for laminating the EL sheet and the metal dome sheet; A top tape for laminating the EL sheet and the metal dome sheet; And And a release film attached to a lower surface of the metal dome sheet to protect the metal dome sheet. 12. The EL metal dome sheet according to claim 10, wherein the adhesive sheet is coated so that a space is formed at a position corresponding to a hole formed in the metal dome sheet. 12. The EL metal dome sheet according to claim 11, wherein the metal dome sheet has a thickness of 0.06 mm to 0.2 mm.

Images