KR200454612Y1 - Multiple Waveguide Films and Convertible Multiple Keypads Comprising the Same - Google Patents

Abstract

The multi-waveguide film includes a first waveguide film having a first pattern and a second waveguide film disposed under the first waveguide film and having a second pattern and having an auxiliary layer formed on an upper surface thereof. Therefore, the multi-waveguide film can block light interference between the waveguide films, improve the brightness of the light guided from the waveguide film located below, and can be manufactured in a slim form.

Description

MULTIPLE LIGHT-GUIDE FILM AND CONVERSIONAL MULTIPLE KEYPAD HAVING THE SAME}

The present invention relates to a keypad, and more particularly, to a multiple waveguide film and a convertible multiple keypad including the plurality of patterns to be selectively displayed on one keypad.

With the recent development of technology, electronic devices are becoming smaller while the functions of electronic devices are gradually expanding. Therefore, although the space for the keypad provided in the electronic device is limited, patterns such as letters, symbols, numbers, and the like that need to be input through the keypad are continuously increasing.

Conventionally, such patterns such as letters, symbols, numbers, etc. are used to simultaneously display the buttons on the keypad. However, the conventional methods have difficulty in recognizing patterns because the size of the patterns displayed on the buttons on the keypad is inevitably reduced. There is this. In addition, this conventional approach is limited to accommodate the ever-increasing patterns.

In order to solve this problem, recently, a conversion type dual keypad has been used in which different patterns are selectively displayed by irradiating light independently on a plurality of waveguide films having different patterns. Such a convertible dual keypad does not need to simultaneously display patterns such as letters, symbols, numbers, and the like on buttons on the keypad, thereby reducing the size of the patterns.

1 is a cross-sectional view showing a conventional dual waveguide film provided in the conversion type dual keypad.

Referring to FIG. 1, the conventional dual waveguide film 10 includes a first waveguide film 12 having a first pattern 13, a second waveguide film 14 having a second pattern 15, and a first waveguide. A translucent film 16 for blocking light interference between the film 12 and the second waveguide film 14. However, since the conventional dual waveguide film 10 includes a translucent film 16 for blocking light interference between the first waveguide film 12 and the second waveguide film 14, the second waveguide film 14 When the light irradiated to the outside proceeds to the outside, the translucent film 16 has a problem that the luminance is greatly reduced. In addition, the conventional dual waveguide film 10 should be provided with a semi-transparent film 16 separately, the first adhesive layer and the semi-transparent film 16 for bonding the translucent film 16 to the first waveguide film 12 Since the second adhesive layer for bonding with the second waveguide film 14 has to be provided, there is a problem that it is difficult to manufacture a slim form.

One object of the present invention is to block light interference between the waveguide film, improve the brightness of the light (guided) guided in the waveguide film located below, to provide a multi-waveguide film that can be manufactured in a slim form will be.

Another object of the present invention is to block the light interference between the waveguide film, improve the brightness of the light guided from the waveguide film located in the lower, suitable for slimming by including a multi-waveguide film that can be manufactured in a slim form It is to provide a convertible multiple keypad.

In order to achieve the above object of the present invention, a multi-waveguide film according to an embodiment of the present invention is located below the first waveguide film and the first waveguide film having a first pattern and has a second pattern It may include a second waveguide film having an auxiliary layer formed on the upper surface.

According to an embodiment of the multiple waveguide film, the auxiliary layer may be formed by printing a transparent ink.

According to an embodiment of the multi-waveguide film, the auxiliary layer may block light interference between the first waveguide film and the second waveguide film, and may improve the brightness of light guided by the second waveguide film.

According to an embodiment of the multiple waveguide film, the transparent ink may be a light reflection ink having an effect of reflecting light.

According to an embodiment of the multiple waveguide film, the light reflecting ink may be ink to which reflective beads or pearl particles are added.

According to an embodiment of the multiple waveguide film, the transparent ink may be a light diffusion ink having an effect of diffusing light.

In some embodiments, the first and second waveguide films may be connected to different light sources, and the different light sources may irradiate light independently of the first and second waveguide films.

In order to achieve the above object of the present invention, a multi-waveguide film according to another embodiment of the present invention is a first waveguide film having a first pattern, is located below the first waveguide film and has a second pattern A second waveguide film having a first auxiliary layer formed on an upper surface thereof, and a third waveguide film having a third pattern disposed on a lower portion of the second waveguide film and having a second auxiliary layer formed on an upper surface thereof may be included.

According to an embodiment of the multiple waveguide film, the first and second auxiliary layers may be formed by printing transparent ink.

According to an embodiment of the multi-waveguide film, the first and second auxiliary layers may be formed by printing different types of the transparent ink.

According to an embodiment of the multiple waveguide film, the transparent ink may be a light reflective ink having an effect of reflecting light.

According to an embodiment of the multiple waveguide film, the light reflecting ink may be ink to which reflective beads or pearl particles are added.

According to an embodiment of the multiple waveguide film, the transparent ink may be light diffusing ink having an effect of diffusing light.

In example embodiments, the first to third waveguide films may be connected to different light sources, and the different light sources may irradiate light independently on the first to third waveguide films.

In order to achieve the above object of the present invention, the first embodiment of the conversion-type multiple keypad according to an embodiment of the present invention is a pad having a plurality of buttons, a multi-waveguide film positioned below the pad, the It may include a plurality of light sources for irradiating light to the multi-waveguide film and a circuit board disposed below the multi-waveguide film and provided with a dome switch. The multi-waveguide film may include a first waveguide film having a first pattern and a second waveguide film having a second pattern positioned below the first waveguide film and having a second pattern formed by printing transparent ink on the upper surface. It may include.

In order to achieve another object of the present invention described above, a second embodiment of the conversion-type multiple keypad according to an embodiment of the present invention is a pad having a plurality of buttons, a multi-waveguide film located below the pad, the It may include a plurality of light sources for irradiating light to the multi-waveguide film and a circuit board disposed below the multi-waveguide film and provided with a dome switch. In addition, the multi-waveguide film may include a first waveguide film and a second waveguide film having an auxiliary layer formed under the first waveguide film and the transparent ink is printed on the upper surface.

In some embodiments, the pad may include a first pattern, and a second pattern may be provided on one waveguide film among the first and second waveguide films.

According to the exemplary embodiment of the conversion type multiple keypad, light guided from the waveguide film having no pattern among the first and second waveguide films may emit the first pattern.

According to an embodiment of the conversion multiple keypad, the conversion multiple keypad may further include a design layer positioned between the pad and the multiple waveguide film to generate a three-dimensional effect.

In order to achieve another object of the present invention described above, a first embodiment of the conversion-type multiple keypad according to another embodiment of the present invention is a pad having a plurality of buttons, a multi-waveguide film located below the pad, It may include a plurality of light sources for irradiating light to the multi-waveguide film and a circuit board disposed below the multi-waveguide film and provided with a dome switch. In addition, the multi-waveguide film is a first waveguide film having a first pattern, the first waveguide film having a second pattern located on the lower portion of the first waveguide having a first auxiliary layer formed by printing a first transparent ink on the upper surface The second waveguide film and the second waveguide film may include a third waveguide film having a third pattern and having a second auxiliary layer formed by printing a second transparent ink on an upper surface thereof.

In order to achieve the above object of the present invention, a second embodiment of the convertible multiple keypad according to another embodiment of the present invention is a pad having a plurality of buttons, a multi-waveguide film positioned below the pad, the It may include a plurality of light sources for irradiating light to the multi-waveguide film and a circuit board disposed below the multi-waveguide film and provided with a dome switch. The multi-waveguide film may further include a first waveguide film, a second waveguide film having a first auxiliary layer formed under the first waveguide film and formed by printing a first transparent ink on an upper surface thereof, and below the second waveguide film. And a third waveguide film having a second auxiliary layer formed by printing a second transparent ink on the upper surface.

According to the embodiment of the conversion type multiple keypad, the pad is provided with a first pattern, one of the first to third waveguide film is provided with a second pattern on the waveguide film, the first to third waveguide film Among the other waveguide film may be provided with a third pattern.

According to the exemplary embodiment of the conversion type multiple keypad, light guided from the waveguide film having no pattern among the first to third waveguide films may emit the first pattern.

According to an embodiment of the conversion multiple keypad, the conversion multiple keypad may further include a design layer positioned between the pad and the multiple waveguide film to generate a three-dimensional effect.

The multi-waveguide film according to the embodiments of the present invention can block light interference between the waveguide films without including a separate film, improve the brightness of the light guided from the waveguide film located below, and slim It may be manufactured in one form and may be implemented in a configuration including a plurality of waveguide films.

Convertible multi-keypad according to embodiments of the present invention can block the light interference between the waveguide films without including a separate film, improve the brightness of the light guided from the waveguide film located below, By including multiple waveguide films that can be manufactured in a slim form, the number of patterns displayed on one keypad can be increased.

With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, embodiments of the present invention may be implemented in various forms and It should not be construed as limited to the embodiments described in.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Similar reference numerals are used for the components in describing the drawings.

Terms such as first and second may be used to describe various components, but the components are not limited by these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may be present in the middle. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it may be understood that there is no other component in between. Other expressions describing the relationship between the components may be interpreted as well, such as "between" and "immediately between" or "neighboring to" and "directly neighboring".

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It will be understood that it does not exclude in advance the possibility of the presence or the addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

2 is a cross-sectional view illustrating a multiple waveguide film according to an embodiment of the present invention.

Referring to FIG. 2, the multiple waveguide film 100 may include a first waveguide film 120 and a second waveguide film 140. In addition, an auxiliary layer 145 may be formed on an upper surface of the second waveguide film 140.

The first waveguide film 120 is positioned on the second waveguide film 140 and includes a first pattern 122. As the first waveguide film 120, a substrate such as PC, PE, PET, PMMA, PU, or the like may be used, and the first pattern 122 may be formed on the first waveguide film 120 by a hot press method. Can be formed. The second waveguide film 140 is positioned below the first waveguide film 120 and includes a second pattern 142. Similarly, the second waveguide film 140 may be formed of a substrate such as PC, PE, PET, PMMA, or PU, and the second pattern 142 may be formed on the second waveguide film 140 by a hot press method. have. The first waveguide film 120 and the second waveguide film 140 are connected to different light sources, and the light source connected to the first waveguide film 120 may radiate light to the first waveguide film 120 from the side. The light source connected to the second waveguide film 140 may irradiate light to the second waveguide film 140 from the side. Preferably, the light source may be a light emitting diode (LED).

An auxiliary layer 145 is formed on the upper surface of the second waveguide film 140. The auxiliary layer 145 blocks light interference between the first waveguide film 120 and the second waveguide film 140 and improves the brightness of light radiated to the second waveguide film 140 to the outside. For example, the transparent ink may be formed on the upper surface of the second waveguide film 140. At this time, the transparent ink is a reflection ink having the effect of reflecting light by the addition of reflective beads or pearl particles, or a light diffusion ink having the effect of diffusing light. Can be. Therefore, an auxiliary layer 145 having a light reflection effect or a light diffusion effect is positioned between the first waveguide film 120 and the second waveguide film 140 so that the first waveguide film 120 and the second waveguide film ( Light interference between the 140 may be blocked to solve a problem such as a moire phenomenon. In addition, when light is irradiated to the second waveguide film 140 from the light source, since the irradiated light proceeds to the outside through the auxiliary layer 145, the light is reflected or diffused from the auxiliary layer 145 to the outside. You will proceed. As a result, the brightness of light irradiated to the second waveguide film 140 from the light source and proceeds to the outside may be greatly improved.

As such, the multi-waveguide film 100 according to the embodiment of the present invention is inserted into the translucent film between the first waveguide film 120 and the second waveguide film 140, compared to the conventional method of preventing light interference. By forming an auxiliary layer 145 having a light reflection effect or a light diffusion effect on the second waveguide film 140, light interference between the first waveguide film 120 and the second waveguide film 140 may be reduced. It is possible to block more effectively, and the luminance of the light emitted from the light source to the second waveguide film 140 to pass through the auxiliary layer 145 having the light reflection effect or the light diffusion effect can be greatly improved. . In addition, the multi-waveguide film 100 according to the embodiment of the present invention does not need to insert a separate film between the first waveguide film 120 and the second waveguide film 140, compared to the conventional method Not only can be manufactured in a slim form, but the manufacturing process is simple and the manufacturing cost is low.

However, in the above description, the auxiliary layer 145 is formed in such a manner that the transparent ink is printed on the upper surface of the second waveguide film 140, but as an example, the auxiliary layer 145 is the second waveguide according to the manufacturing process. The upper surface of the film 140 may be formed in various ways such as a transparent ink is coated. In addition, although not shown in FIG. 2, the first waveguide film 120 and the second waveguide film 140 may be provided with an adhesive or a double-sided tape in the edge region of the first waveguide film 120 and the second waveguide film 140. By positioning it can be combined with each other.

FIG. 3 is a plan view illustrating the multiple waveguide film of FIG. 2. FIG.

Referring to FIG. 3, the multiple waveguide film 100 may include a first waveguide film 120 having a first pattern and a second waveguide film 140 having a second pattern. In addition, an auxiliary layer is formed on the top surface of the second waveguide film 140 in a manner that transparent ink is printed. At this time, the transparent ink may be light reflecting ink or light diffusing ink. As shown in FIG. 3, the first waveguide film 120 may be irradiated with light from the first light source LS1, and the second waveguide film 140 may be irradiated with light from the second light source LS2. have. However, the structure of the multiple waveguide film 100 shown in FIG. 3 is one example, and the position and number of the first and second light sources LS1 and LS2 and the first and second waveguide films 120 according to a manufacturing process. , The size and shape of the 140 may be variously changed.

As such, the first waveguide film 120 and the second waveguide film 140 are connected to different light sources, and the first light source LS1 connected to the first waveguide film 120 has a first waveguide film ( 120 may irradiate light, and the second light source LS2 connected to the second waveguide film 140 may irradiate light to the second waveguide film 140 at a side surface thereof. The first and second light sources LS1 and LS2 may be light emitting diodes, and may independently emit light to the first and second waveguide films 120 and 140 by a circuit board (not shown) that controls their operation. You can investigate. However, irradiating light independently to the first and second waveguide films 120 and 140 by a circuit board (not shown) in which the first and second light sources LS1 and LS2 control their operation is a corresponding technology. Since it is general to those skilled in the art, a detailed description thereof will be omitted.

4 is a cross-sectional view illustrating a convertible multiple keypad according to an embodiment of the present invention.

Referring to FIG. 4, the convertible multiple keypad 240 includes a pad 242 having a plurality of buttons, a multiple waveguide film 100 positioned below the pad 242, and a bottom of the multiple waveguide film 100. A circuit board 244 disposed at and provided with a dome switch 245 and first and second light sources 246 and 247 irradiating light to the multiple waveguide film 100 may be included.

When the convertible multiple keypad 240 is pressurized to a button of the pad 242, the pressure is transmitted to the dome switch 245 of the circuit board 244 via the multi-waveguide film 100. The manner in which the type multiple keypad 240 operates is not limited thereto, and may be performed in various ways. However, the method of operating the keypad is general to those skilled in the art, so detailed description thereof will be omitted. As described above, the multiple waveguide film 100 included in the conversion type multiple keypad 240 is positioned under the first waveguide film 120 and the first waveguide film 120 having the first pattern 122. The second waveguide film 140 may include the second waveguide film 140 having the second pattern 142 and the auxiliary layer 145 formed by printing transparent ink on the upper surface. At this time, the transparent ink may be light reflecting ink or light diffusing ink.

The multi-waveguide film 100 included in the conversion multi-keypad 240 receives light from the first and second light sources 246 and 247, and the first waveguide film 120 emits light from the first light source 246. Is irradiated, and the second waveguide film 140 is irradiated with light from the second light source 247. The first and second light sources 246 and 247 may be light emitting diodes, which are independent of the first and second waveguide films 120 and 140 by a circuit board 244 or a separate circuit board (not shown). Can be controlled to irradiate light. As described above, the conversion-type multiple keypad 240 according to an embodiment of the present invention includes the multiple waveguide film 100 so that the first pattern 122 and the second pattern 142 are displayed on the pad 242. It is possible to minimize light interference, such as overlapping, and between luminance of light such that the first pattern 122 is displayed on the pad 242 and luminance of light such that the second pattern 142 is displayed on the pad 242. It can be ensured that no substantial difference occurs. In addition, since the multi-waveguide film 100 is manufactured in a slim form compared to the conventional multi-waveguide film, it can be manufactured in a slim form.

According to another embodiment of the conversion-type multiple keypad 240, a first pattern is formed on the pad 242 having a plurality of buttons, and on one waveguide film of the first and second waveguide films 120 and 140. The second pattern may be provided, and the other one of the first and second waveguide films 120 and 140 may not be provided with the pattern. In this case, light is irradiated onto the waveguide film with the second pattern from the first or second light sources 246 and 247 so that the second pattern can be displayed on the pad 242, and the first or second light source Light is irradiated onto the waveguide film having no pattern from the lines 246 and 247 to emit light of the first pattern formed on the pad 242.

For example, a first pattern, that is, a number pattern, is formed on a plurality of buttons of the pad 242, a second pattern, that is, a letter pattern, is provided on the first waveguide film 120, and the second waveguide film 140 is provided. ), When the pattern is not provided, light is irradiated from the first light source 246 to the first waveguide film 120 so that a second pattern, that is, a letter pattern is displayed on the pad 242, and the second light source ( As the light is irradiated to the second waveguide film 140 from 247, the first pattern, that is, the numeric pattern formed on the pad 242 may emit light. However, this is only one example, and the first pattern may be formed on the entire pad 242 to be used as a pattern for decorating the entire pad 242. In addition, a design layer (not shown) having a pattern representing a stereoscopic effect may be disposed between the pad 242 and the multi-waveguide film 100 so that the stereoscopic effect may appear on the multiple keypad 240.

FIG. 5 is a diagram illustrating an electronic device including the convertible multiple keypad of FIG. 4.

Referring to FIG. 5, the electronic device 200 may include a display 220 and a convertible multiple keypad 240, and the convertible multiple keypad 240 may include a pad including a plurality of buttons and a lower portion of the pad. A multi-waveguide film positioned, a plurality of light sources for irradiating light to the multi-waveguide film, and a circuit board positioned below the multi-waveguide film and having a dome switch, wherein the multi-waveguide film comprises a first pattern; The first waveguide film and the first waveguide film may include a second waveguide film having a second pattern and having an auxiliary layer formed by printing a transparent ink on an upper surface thereof. However, since the multi-waveguide film and the conversion-type multi-keypad including the same have been described above, a detailed description thereof will be omitted.

The conversion-type multiple keypad 240 included in the electronic device 200 according to an embodiment of the present invention does not simultaneously display a plurality of patterns, for example, a number pattern, a Korean pattern, and an English pattern, on a button. In addition, only a pattern necessary for input can be selectively displayed on a button. This selective pattern display operation is achieved by the first and second light sources controlled by the circuit board selectively irradiating light to the first and second waveguide films. In this case, the conversion type multiple keypad 240 may include a plurality of waveguide films to prevent light interference such as overlapping of a plurality of patterns, for example, a number pattern, a Korean pattern, and an English pattern, and the number pattern and the Korean pattern. It is possible to prevent a substantial difference between the luminance of the light that causes the pattern and the English pattern to be displayed on the keypad 240. In addition, since the multi-waveguide film may be manufactured in a slim form, the convertible multiple keypad 240 including the same and the electronic device 200 including the same may be manufactured in a slim form.

6 is a cross-sectional view illustrating a multiple waveguide film according to another embodiment of the present invention.

Referring to FIG. 6, the multiple waveguide film 300 may include a first waveguide film 320, a second waveguide film 340, and a third waveguide film 360. In addition, a first auxiliary layer 345 may be formed on an upper surface of the second waveguide film 340, and a second auxiliary layer 365 may be formed on an upper surface of the third waveguide film 360.

The first waveguide film 320 is positioned on the second waveguide film 340 and includes a first pattern 322. As the first waveguide film 320, a substrate such as PC, PE, PET, PMMA, or PU may be used, and the first pattern 322 may be formed on the first waveguide film 320 by a hot press method. . The second waveguide film 340 is positioned between the first waveguide film 320 and the third waveguide film 360 and includes a second pattern 342. As the second waveguide film 340, a substrate such as PC, PE, PET, PMMA, or PU may be used, and a second pattern 342 may be formed on the second waveguide film 340 by a hot press method. . The third waveguide film 360 is positioned below the second waveguide film 340 and includes a third pattern 362. Similarly, the third waveguide film 360 may be formed of a substrate such as PC, PE, PET, PMMA, or PU, and the third pattern 362 may be formed on the third waveguide film 360 by a hot press method. have. The first waveguide film 320, the second waveguide film 340, and the third waveguide film 360 are connected to different light sources, and the light source connected to the first waveguide film 320 has a first waveguide film ( Light may be irradiated to the light source 320, and the light source connected to the second waveguide film 340 may emit light to the second waveguide film 340 from the side, and the light source may be connected to the third waveguide film 360. The light may be irradiated onto the third waveguide film 360 from the side surface. Preferably, the light source may be a light emitting diode.

The first auxiliary layer 345 is formed on the top surface of the second waveguide film 340, and the second auxiliary layer 365 is formed on the top surface of the third waveguide film 360. The first auxiliary layer 345 and the second auxiliary layer 365 block light interference between the first to third waveguide films 320, 340, and 360, and are irradiated with the second waveguide film 340 to the outside. In order to improve the luminance of the light propagating to the third waveguide film 360 and the luminance of the light traveling toward the outside, transparent ink is formed on the upper surfaces of the second waveguide film 340 and the third waveguide film 360, respectively. It may be formed in a printed manner. In this case, the transparent ink may be a light reflecting ink having an effect of reflecting light by adding reflective beads or pearl particles or a light diffusing ink having an effect of diffusing light. In addition, the first auxiliary layer 345 and the second auxiliary layer 365 may be formed by printing the same kind of transparent ink, but may also be formed by printing different types of transparent ink. . For example, the first auxiliary layer 345 may be formed of light reflecting ink, and the second auxiliary layer may be formed of light diffusing ink.

Accordingly, a first auxiliary layer 345 having a light reflection effect or a light diffusion effect is positioned between the first waveguide film 320 and the second waveguide film 340, and the second waveguide film 340 and the third waveguide film 340 are disposed between the first waveguide film 320 and the second waveguide film 340. A second auxiliary layer 365 having a light reflection effect or a light diffusion effect is also disposed between the waveguide films 360 to prevent light interference between the first to third waveguide films 320, 340, and 360, thereby moiring. Problems such as a phenomenon can be solved. In addition, when light is irradiated to the second waveguide film 340 from the light source, the light is reflected or reflected by the first auxiliary layer 345 because the irradiated light travels to the outside through the first auxiliary layer 345. It spreads and proceeds to the outside. As a result, the brightness of the light irradiated to the second waveguide film 340 from the light source to the outside can be greatly improved. In addition, when light is irradiated to the third waveguide film 360 from the light source, the light is transmitted to the outside through the second auxiliary layer 365 and the first auxiliary layer 345. Reflected or diffused in the layer 365 and the first auxiliary layer 345 to the outside. As a result, the luminance of light emitted from the light source to the third waveguide film 360 and traveling to the outside may be greatly improved. Therefore, the luminance of the light irradiated to the first to third waveguide films 320, 340, and 360 to the outside may be substantially the same.

As described above, the multi-waveguide film 300 according to another embodiment of the present invention is a second waveguide using the first auxiliary layer 345 and the second auxiliary layer 365 each having a light reflection effect or a light diffusion effect. By forming on the film 340 and the third waveguide film 360, it is possible to more effectively block the light interference between the first to third waveguide films 320, 340, 360, the second waveguide film 340 from the light source 1) the first auxiliary layer 345 or / and the second auxiliary light having the light reflection effect or the light diffusion effect is irradiated to the third waveguide film 360 and irradiated to the outside. The luminance can be greatly improved by passing through the layer 365. In addition, since the multiple waveguide film 300 according to another embodiment of the present invention does not need to insert a separate film between the first to third waveguide films 320, 340, and 360, it may be manufactured in a slim form. In addition, the manufacturing process is simple and the manufacturing cost is low.

However, the first auxiliary layer 345 is formed in such a manner that the transparent ink is printed on the upper surface of the second waveguide film 340, and the transparent ink is printed on the upper surface of the third waveguide film 360. 2 has been described that the auxiliary layer 365 is formed, but as an example, the first and second auxiliary layers 345 and 365 are transparent on the upper surfaces of the second and third waveguide films 340 and 360 according to a manufacturing process. The ink may be formed in various ways such as coating. In addition, although not shown in FIG. 6, the first waveguide film 320 and the second waveguide film 340 may be provided with an adhesive or a double-sided tape in the edge region of the first waveguide film 320 and the second waveguide film 340. The second waveguide film 340 and the third waveguide film 360 may be bonded to each other by being positioned, and an adhesive or a double-sided tape may be positioned at the edge region of the second waveguide film 340 and the third waveguide film 360. Can be combined with each other. Furthermore, the multi-waveguide film 300 according to another embodiment of the present invention is described as including the first to third waveguide films 320, 340, 360, which is an example of the first waveguide film 320 Of course, three or more waveguide films may be located underneath.

FIG. 7 is a plan view illustrating the multiple waveguide film of FIG. 6. FIG.

Referring to FIG. 7, the multiple waveguide film 300 includes a first waveguide film 320 having a first pattern, a second waveguide film 340 having a second pattern, and a third waveguide having a third pattern. It may include a film 360. In addition, a first auxiliary layer is formed on the top surface of the second waveguide film 340 in such a manner that the first transparent ink is printed, and a second transparent ink is printed on the top surface of the third waveguide film 360. An auxiliary layer is formed. In this case, the first transparent ink and the second transparent ink may be the same type of transparent ink or may be different types of transparent ink. As shown in FIG. 7, light may be irradiated from the first light source LS1 to the first waveguide film 320, and light may be irradiated from the second light source LS2 to the second waveguide film 340. The third waveguide film 360 may be irradiated with light from the third light source LS3. However, the structure of the multiple waveguide film 300 shown in FIG. 7 is one example, and the position and number of the first to third light sources LS1, LS2, and LS3 according to the manufacturing process, and the first to third waveguide films The size and shape of the 320, 340, 360 may be changed in various ways.

 As such, the first to third waveguide films 320, 340, and 360 are connected to different light sources, and the first light source LS1 connected to the first waveguide film 320 has a first waveguide film 320 at a side surface thereof. ), The second light source LS2 connected to the second waveguide film 340 may irradiate light to the second waveguide film 340 from the side, and the third waveguide film 360 may be irradiated with light. The third light source LS3 connected to the third light source LS3 may radiate light to the third waveguide film 360 from the side. The first to third light sources LS1, LS2, and LS3 may be light emitting diodes, and the first to third waveguide films 320, 340, and 360 are controlled by a circuit board (not shown) that controls their operation. The light can be irradiated independently. However, the first to third light sources LS1, LS2, and LS3 irradiate light independently to the first to third waveguide films 320, 340, and 360 by a circuit board (not shown) that controls their operation. Since it is common to those skilled in the art, a detailed description thereof will be omitted.

8 is a cross-sectional view illustrating a convertible multiple keypad according to another embodiment of the present invention.

Referring to FIG. 8, the convertible multiple keypad 440 may include a pad 442 having a plurality of buttons, a multi waveguide film 300 positioned below the pad 442, and a bottom of the multi waveguide film 300. And a circuit board 444 having a dome switch 445 and first to third light sources 446, 447, and 448 for irradiating light to the multiple waveguide film 300.

When the convertible multiple keypad 440 is pressurized to the button of the pad 442, the pressure is transmitted to the dome switch 445 of the circuit board 444 via the multi-waveguide film 300. The manner in which the type multiple keypad 440 operates is not limited thereto, and may be performed in various ways. However, the method of operating the keypad is general to those skilled in the art, so detailed description thereof will be omitted. As described above, the multiple waveguide film 300 included in the conversion type multiple keypad 440 includes a first waveguide film 320, a first waveguide film 320, and a third waveguide having a first pattern 322. The second waveguide film 340 and the second waveguide film 340 having a second pattern 342 located between the film 360 and having a first auxiliary layer 345 formed by printing the first transparent ink on the upper surface. The third waveguide film 360 may include a third waveguide film 360 positioned below and having a second auxiliary layer 365 formed by printing a second transparent ink on an upper surface thereof. At this time, the first and second transparent inks may be light reflecting inks or light diffusing inks. In addition, the first transparent ink and the second transparent ink may be the same type of transparent ink or may be different types of transparent ink.

The multi-waveguide film 300 included in the conversion multiple keypad 440 is irradiated with light from the first to third light sources 446, 447, and 448, and the first waveguide film 320 is the first light source 446. Light is irradiated from the second waveguide film 340 is irradiated with light from the second light source 447, the third waveguide film 360 is irradiated with light from the third light source (448). The first to third light sources 446, 447, and 448 may be light emitting diodes, and the first to third waveguide films 320, 340 may be formed by a circuit board 444 or a separate circuit board (not shown). 360 may be controlled to irradiate light independently. As described above, the conversion-type multiple keypad 440 according to another embodiment of the present invention includes the multiple waveguide film 300 so that the first pattern 322, the second pattern 342, and the third pattern 362 may be padded. In the display at 442, light interference such as overlapping light may be minimized, and the luminance of the light such that the first pattern 322 is displayed on the pad 442, and the second pattern 342 may be applied to the pad 442. It is possible to prevent a substantial difference between the luminance of the light to be displayed and the luminance of the light to be displayed on the pad 442 by the third pattern 362. In addition, since the multi-waveguide film 300 is manufactured in a slim form compared to the conventional multi-waveguide film, it can be manufactured in a slim form.

According to another embodiment of the conversion type multiple keypad 440, a first pattern is formed on a pad 442 having a plurality of buttons, and one waveguide among the first to third waveguide films 320, 340, and 360. A second pattern is provided on the film, and a third pattern is provided on the other waveguide film among the first to third waveguide films 320, 340, and 360, and the first to third waveguide films 320, 340, and 360 are provided. ), The remaining waveguide film may not have a pattern. In this case, light is irradiated onto the waveguide film with the second pattern from the first, second or third light sources 446, 447, and 448 so that the second pattern can be displayed on the pad 442. Light is irradiated onto the waveguide film with the third pattern from the first, second, or third light sources 446, 447, and 448 so that the third pattern may be displayed on the pad 442. As light is irradiated onto the waveguide film having no pattern from the third light sources 446, 447, and 448, light guided from the waveguide film having no pattern may emit the first pattern formed on the pad 442. .

For example, a first pattern, that is, a pattern pattern, is formed on the pad 442, a second pattern, that is, a number pattern, is provided on the first waveguide film 320, and a third pattern on the second waveguide film 340. That is, when the character pattern is provided and the pattern is not provided in the third waveguide film 360, the light is irradiated from the first light source 446 to the first waveguide film 320. The light is irradiated onto the pad 442, and the light is irradiated from the second light source 447 to the second waveguide film 340 to display a third pattern, that is, a character pattern on the pad 442. As the light is irradiated to the third waveguide film 360 from 448, the first pattern, that is, the pattern pattern, formed on the pad 442 may emit light. However, this is only one example, and the type of the pattern used as the first to third patterns may be variously changed according to a required condition. In addition, a design layer (not shown) having a pattern representing a stereoscopic effect may be disposed between the pad 442 and the multiple waveguide film 300 so that the stereoscopic effect may appear on the multiple keypad 440.

FIG. 9 is a diagram illustrating an electronic device including the convertible multiple keypad of FIG. 8.

Referring to FIG. 9, the electronic device 400 may include a display 420 and a convertible multiple keypad 440, and the convertible multiple keypad 440 may include a pad including a plurality of buttons and a lower portion of the pad. A multi-waveguide film positioned, a plurality of light sources for irradiating light to the multi-waveguide film, and a circuit board positioned below the multi-waveguide film and having a dome switch, wherein the multi-waveguide film comprises a first pattern; A first waveguide film, a second waveguide film positioned below the first waveguide film and having a second pattern, and having a first auxiliary layer formed by printing the first transparent ink on the upper surface, and positioned below the second waveguide film and the second waveguide film. It may include a third waveguide film having a second auxiliary layer formed by printing a second transparent ink on the upper surface. However, since the multi-waveguide film and the conversion-type multi-keypad including the same have been described above, a detailed description thereof will be omitted.

The conversion-type multiple keypad 440 included in the electronic device 400 according to another embodiment of the present invention does not simultaneously display a plurality of patterns, for example, a number pattern, a Korean pattern, and an English pattern, on a button. In addition, only a pattern necessary for input can be selectively displayed on a button. This selective pattern display operation is performed by the first to third light sources controlled by the circuit board selectively irradiating light to the first to third waveguide films, respectively. In this case, the conversion type multiple keypad 440 may include a plurality of waveguide films to prevent light interference such as overlapping of a plurality of patterns, for example, a number pattern, a Korean pattern, and an English pattern. It is possible to prevent a substantial difference between the luminance of light such that the Korean pattern and the English pattern are displayed on the keypad 440. In addition, since the multiple waveguide film may be manufactured in a slim form, the convertible multiple keypad 440 including the same and the electronic device 400 including the same may also be manufactured in a slim form.

In the above, the multi-waveguide film according to the embodiments of the present invention, the conversion-type multi-keypad including the same and an electronic device including the same have been described, but these are exemplary and generally in the art without departing from the spirit of the present invention. Various modifications and changes may be made by those skilled in the art. For example, in the embodiments of the present invention, although the first pattern and the second pattern or the first to third patterns are formed to overlap each other, it is described as being selectively displayed on the conversion type keypad. The pattern and the second pattern or the first to third patterns may be formed in a shape that does not overlap each other and may be selectively displayed on the conversion type keypad. In addition, in the embodiments of the present invention, it is described that the first pattern and the second pattern or the first pattern to the third pattern are formed on the lower surface of the waveguide film by hot pressing, but the first pattern and the second pattern or the first pattern are described. The pattern to third pattern may not only be formed on the upper surface of the waveguide film according to the manufacturing process, but also may be formed by screen printing. On the other hand, the expression waveguide film used in the present application is not intended to limit the technical idea of the present invention only to the waveguide film, the technical idea of the present invention is to be interpreted as a sheet (sheet) that can guide the light.

According to the present invention, the multi-waveguide film may block light interference between the waveguide films without including a separate film, improve the brightness of the light guided from the waveguide film located below, and in a slim form It can be manufactured can be implemented in a configuration including a plurality of waveguide films. In addition, the converting multiple keypad can include such multiple waveguide films to increase the number of patterns displayed on one keypad. Therefore, the multi-waveguide film of the present invention and the convertible multi-keypad including the same are a cellular phone, a smart phone, a portable multimedia player, an MP3 player, a personal digital assistant, and a game machine. It can be applied to an electronic device including a keypad such as a game player and a notebook.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art may variously modify and modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated that it can be changed.

1 is a cross-sectional view showing a conventional dual waveguide film provided in the conversion type dual keypad.

2 is a cross-sectional view illustrating a multiple waveguide film according to an embodiment of the present invention.

FIG. 3 is a plan view illustrating the multiple waveguide film of FIG. 2. FIG.

4 is a cross-sectional view illustrating a convertible multiple keypad according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating an electronic device including the convertible multiple keypad of FIG. 4.

6 is a cross-sectional view illustrating a multiple waveguide film according to another embodiment of the present invention.

FIG. 7 is a plan view illustrating the multiple waveguide film of FIG. 6. FIG.

8 is a cross-sectional view illustrating a convertible multiple keypad according to another embodiment of the present invention.

FIG. 9 is a diagram illustrating an electronic device including the convertible multiple keypad of FIG. 8.

<Explanation of symbols for the main parts of the drawings>

100: multiple waveguide film 120: first waveguide film

140: second waveguide film 145: auxiliary layer

300: multiple waveguide film 320: first waveguide film

340: second waveguide film 345: first auxiliary layer

360: third waveguide film 365: second auxiliary layer

Claims (24)

A first waveguide film having a first pattern; And A second waveguide film positioned below the first waveguide film, having a second pattern, and having an auxiliary layer formed on an upper surface thereof; The auxiliary layer is formed by printing transparent ink, and blocks light interference between the first waveguide film and the second waveguide film, and improves the brightness of light guided by the second waveguide film. Waveguide film made with. delete delete The multiple waveguide film of claim 1, wherein the transparent ink is a reflection ink having an effect of reflecting light. 5. The multiple waveguide film of claim 4, wherein the light reflecting ink is an ink to which reflective beads or pearl particles are added. The multi-waveguide film of claim 1, wherein the transparent ink is a light diffusion ink having an effect of diffusing light. The multi-waveguide film of claim 1, wherein the first and second waveguide films are connected to different light sources, and the different light sources irradiate light independently to the first and second waveguide films. A first waveguide film having a first pattern; A second waveguide film positioned below the first waveguide film, having a second pattern, and having a first auxiliary layer formed on an upper surface thereof; And A third waveguide film positioned below the second waveguide film, having a third pattern, and having a second auxiliary layer formed on an upper surface thereof; The first and second auxiliary layers are formed by printing transparent ink, block light interference between the first to third waveguide films, and brightness of light guided by the second and third waveguide films. Multi-waveguide film, characterized in that to improve. delete The multiple waveguide film of claim 8, wherein the first and second auxiliary layers are formed by printing different types of transparent inks. The multi-waveguide film according to claim 8, wherein the transparent ink is a light reflective ink having an effect of reflecting light. 12. The multiple waveguide film of claim 11, wherein the light reflecting ink is an ink to which reflective beads or pearl particles are added. 9. The multi-waveguide film of claim 8, wherein the transparent ink is a light diffusing ink having an effect of diffusing light. The multi-waveguide film of claim 8, wherein the first to third waveguide films are connected to different light sources, and the different light sources irradiate light independently on the first to third waveguide films. A pad having a plurality of buttons; A multiple waveguide film positioned below the pad; A plurality of light sources for irradiating light onto the multiple waveguide film; And A circuit board positioned below the multiple waveguide film and having a dome switch; The multi-waveguide film is A first waveguide film having a first pattern; And A second waveguide film positioned below the first waveguide film, having a second pattern, and having a second layer formed by printing transparent ink on an upper surface thereof; And the auxiliary layer blocks light interference between the first waveguide film and the second waveguide film, and improves brightness of light guided by the second waveguide film. A pad having a plurality of buttons; A multiple waveguide film positioned below the pad; A plurality of light sources for irradiating light onto the multiple waveguide film; And A circuit board positioned below the multiple waveguide film and having a dome switch; The multi-waveguide film is A first waveguide film; And A second waveguide film positioned below the first waveguide film and having an auxiliary layer formed by printing transparent ink on an upper surface thereof, And the auxiliary layer blocks light interference between the first waveguide film and the second waveguide film, and improves brightness of light guided by the second waveguide film. 17. The convertible multiple keypad of claim 16, wherein a first pattern is provided on the pad, and a second pattern is provided on one waveguide film among the first and second waveguide films. 18. The conversion type multiple keypad according to claim 17, wherein light guided from the waveguide film having no pattern among the first and second waveguide films emits the first pattern. The method of claim 16, And a design layer positioned between the pad and the multiple waveguide film to generate a stereoscopic effect. A pad having a plurality of buttons; A multiple waveguide film positioned below the pad; A plurality of light sources for irradiating light onto the multiple waveguide film; And A circuit board positioned below the multiple waveguide film and having a dome switch; The multi-waveguide film is A first waveguide film having a first pattern; A second waveguide film positioned below the first waveguide film, having a second pattern, and having a first auxiliary layer formed by printing a first transparent ink on an upper surface thereof; And A third waveguide film positioned below the second waveguide film, having a third pattern, and having a second auxiliary layer formed by printing a second transparent ink on an upper surface thereof; The first and second auxiliary layers block light interference between the first and third waveguide films, and improve brightness of light guided by the second and third waveguide films. Type multiple keypad. A pad having a plurality of buttons; A multiple waveguide film positioned below the pad; A plurality of light sources for irradiating light onto the multiple waveguide film; And A circuit board positioned below the multiple waveguide film and having a dome switch; The multi-waveguide film is A first waveguide film; A second waveguide film positioned below the first waveguide film and having a first auxiliary layer formed by printing a first transparent ink on an upper surface thereof; And A third waveguide film positioned below the second waveguide film and having a second auxiliary layer formed by printing a second transparent ink on an upper surface thereof; The first and second auxiliary layers block light interference between the first and third waveguide films, and improve brightness of light guided by the second and third waveguide films. Type multiple keypad. 22. The method of claim 21, wherein the pad is provided with a first pattern, one of the first to third waveguide film is provided with a second pattern on the film, the other waveguide of the first to third waveguide film Converted multiple keypad characterized in that the film is provided with a third pattern. 23. The convertible multiple keypad of claim 22, wherein light guided from the waveguide film having no pattern among the first to third waveguide films emits the first pattern. The method of claim 21, And a design layer positioned between the pad and the multiple waveguide film to generate a stereoscopic effect.

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