KR101641227B1 - Portable terminal - Google Patents

Abstract

The present invention relates to a mobile terminal having a solar cell, comprising: a circuit board on which a plurality of switches are mounted; And a key assembly disposed at an upper portion of the circuit board and configured to depress the switch, wherein the key assembly includes: a plurality of substrate portions arranged for each of the switches so as to depress the switch; A plurality of solar cells disposed on top of each of the substrate portions; A plurality of light-transmitting keys disposed on top of each of the solar cells; And at least one connection unit connecting the plurality of substrates.

Description

[0001] PORTABLE TERMINAL [0002]

The present invention relates to a mobile terminal having a solar cell.

A portable terminal is a portable device that is portable and has one or more functions such as voice and video call function, information input / output function, and data storing function.

As the functions are diversified, the mobile terminal has complicated functions such as photographing and photographing of movies, playing music or moving picture files, receiving games, broadcasting, etc. These devices are integrally mounted and are equipped with a multimedia player .

In order to implement complex functions in multimedia devices, various new attempts have been made in terms of hardware or software. For example, a user interface environment is provided for a user to easily and conveniently search for or select a function.

BACKGROUND ART Traditionally, a battery that can be charged by a household power source has been in charge of a power source supplied to a portable terminal. As a result, when the battery is discharged, it is troublesome to use a home or office that can be charged. Increasing awareness of energy that does not cause pollution is also an attempt to install a pollution-free power supply means such as a solar cell in a portable terminal.

Since such a solar cell generates electrical energy proportional to its area, it is difficult to apply it to a mobile terminal having a small size.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a mobile terminal equipped with a solar cell, which maximizes a surface area occupied by the solar cell, There is a technical purpose.

According to an aspect of the present invention, there is provided a mobile terminal including: a circuit board having a plurality of switches; And a key assembly disposed at an upper portion of the circuit board and configured to depress the switch, wherein the key assembly includes: a plurality of substrate portions arranged for each of the switches so as to depress the switch; A plurality of solar cells disposed on top of each of the substrate portions; A plurality of light-transmitting keys disposed on top of each of the solar cells; And at least one connection unit connecting the plurality of substrates.

As an example related to the present invention, the key may be formed by engraving letters or numbers engraved on a light-transmitting member.

As an example related to the present invention, the key may be formed by projecting a letter or numeral to a light-transmitting member in an embossed manner.

As an example related to the present invention, the base member may be formed of a translucent resin or glass.

As an example related to the present invention, the connection portion may be formed in the form of a flexible substrate.

As an example related to the present invention, a gap may be formed between the solar cell and the neighboring solar cell so that light can pass therethrough.

As an example related to the present invention, a light emitting unit for illuminating the transparent key may further be provided.

As an example related to the present invention, the light emitting portion may be mounted on the substrate portion.

As an example related to the present invention, the light emitting portion may be mounted on a circuit board on which the switch is mounted.

As an example related to the present invention, the light emitting portion may be disposed for each light transmitting key.

As an example related to the present invention, the light emitting unit may further include a control unit for changing the brightness or color of the light emitting unit according to a charged amount charged by the solar cell.

As one example related to the present invention, the light transmitting key may be directly attached to the upper surface of the solar cell.

As described above, according to the mobile terminal related to the present invention, it is advantageous to secure the required area of the solar cell for generating electricity by applying the solar cell to the keypad having a relatively large area. Therefore, there is no need for a separate solar cell mounting area, and the device can be configured in a small size. Such a method of mounting a solar cell is most effective when applied to a so-called "QWERTY" keyboard including many keys.

According to an embodiment of the present invention, a letter or number is formed on a key having each solar cell, and a structure capable of performing backlighting on the letter or number is provided, thereby minimizing deterioration of appearance by the solar cell.

Hereinafter, a mobile terminal related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

The mobile terminal may be implemented in various forms. For example, the terminal described in this specification may include a mobile terminal such as a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player) And fixed terminals such as a digital TV, a desktop computer, and the like. In the following description, it is assumed that the terminal is a mobile terminal. However, it will be readily apparent to those skilled in the art that the configuration according to the following description may be applied to a fixed terminal, except for a component specially configured for mobile use.

1 is a block diagram of a mobile terminal according to the present invention.

The mobile terminal 100 includes a wireless communication unit 110, an audio / video input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory unit 160, An interface unit 170, a control unit 180, a power supply unit 190, and the like. 1 shows a mobile terminal having various components. However, not all illustrated components are required. A mobile terminal may be implemented by more components than the illustrated components, or a mobile terminal may be implemented by fewer components.

The components will be discussed in turn.

The wireless communication unit 110 may include one or more components that allow wireless communication between the mobile terminal 100 and another wireless communication system or wireless communication between the mobile terminal 100 and the network in which the mobile terminal 100 is located . For example, the wireless communication unit 110 may include a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short range communication module 114, and a location information module 115 .

The broadcast receiving module 111 receives broadcast signals and / or broadcast-related information from an external broadcast management server through a broadcast channel. The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast management server may be a server for generating and transmitting broadcast signals and / or broadcast-related information, or a server for receiving broadcast signals and / or broadcast-related information generated by the broadcast server and transmitting the generated broadcast signals and / or broadcast- The broadcast-related information may mean information related to a broadcast channel, a broadcast program, or a broadcast service provider. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information may also be provided through a mobile communication network, in which case it may be received by the mobile communication module 112.

Broadcast-related information can exist in various forms. For example, an EPG (Electronic Program Guide) of DMB (Digital Multimedia Broadcasting) or an ESG (Electronic Service Guide) of Digital Video Broadcast-Handheld (DVB-H).

The broadcast receiving module 111 receives broadcast signals using various broadcasting systems. In particular, the broadcast receiving module 111 may be a Digital Multimedia Broadcasting-Terrestrial (DMB-T), a Digital Multimedia Broadcasting-Satellite (DMB-S) ), Digital Video Broadcast-Handheld (DVB-H), Integrated Services Digital Broadcast-Terrestrial (ISDB-T), and the like. Of course, the broadcast receiving module 111 is configured to be suitable for all the broadcasting systems that provide broadcast signals as well as the digital broadcasting system described above.

The broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory unit 160.

In addition, the mobile communication module 112 transmits and receives radio signals to at least one of a base station, an external terminal, and a server on a mobile communication network. Here, the wireless signal may include various types of data depending on a voice call signal, a video call signal, or a text / multimedia message transmission / reception.

The wireless Internet module 113 is a module for wireless Internet access, and the wireless Internet module 113 can be built in or externally. WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) and the like can be used as wireless Internet technologies.

The short-range communication module 114 refers to a module for short-range communication. Bluetooth, radio frequency identification (RFID), infrared data association (IrDA), ultra wideband (UWB), ZigBee, and the like can be used as the short distance communication technology.

The location information module 115 is a module for confirming or obtaining the location of the mobile terminal. A typical example of the location information module is a Global Position System (GPS) module. According to the current technology, the GPS module 115 calculates distance information and accurate time information from three or more satellites, and then applies a trigonometric method to the calculated information to calculate three-dimensional current position information according to latitude, longitude, Can be accurately calculated. At present, a method of calculating position and time information using three satellites and correcting an error of position and time information calculated using another satellite is widely used. In addition, the GPS module 115 can calculate speed information by continuously calculating the current position in real time.

An audio / video (A / V) input unit 120 is for inputting an audio signal or a video signal, and may include a camera 121 and a microphone 122. The camera 121 processes an image frame such as a still image or a moving image obtained by the image sensor in a video communication mode or a photographing mode. Then, the processed image frame can be displayed on the display unit 151. [

The image frame processed by the camera 121 may be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. [ The camera 121 may be equipped with two or more cameras according to the configuration of the terminal.

The microphone 122 receives an external sound signal through a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data can be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 112 when the voice data is in the call mode, and output. The microphone 122 may be implemented with various noise reduction algorithms for eliminating noise generated in the process of receiving an external sound signal.

The user input unit 130 generates input data for a user to control the operation of the terminal. The user input unit 130 may include a key pad dome switch, a touch pad (static / static), a jog wheel, a jog switch, and the like. Particularly, when the touch pad has a mutual layer structure with the display unit 151 described later, it can be called a touch screen.

The sensing unit 140 senses the current state of the mobile terminal 100 such as the open / close state of the mobile terminal 100, the position of the mobile terminal 100, the presence or absence of user contact, the orientation of the mobile terminal, And generates a sensing signal for controlling the operation of the mobile terminal 100. For example, when the mobile terminal 100 is in the form of a slide phone, it is possible to sense whether the slide phone is opened or closed. Also, it is responsible for a sensing function related to whether or not the power supply unit 190 is powered on, whether the interface unit 170 is connected to an external device, and the like. Meanwhile, the sensing unit 140 may include a proximity sensor 141. This will be discussed later in connection with touch screens.

The interface unit 170 serves as an interface with all external devices connected to the mobile terminal 100. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, Video input / output (I / O) ports, earphone ports, and the like. Here, the identification module is a chip that stores various information for authenticating the use right of the mobile terminal 100, and includes a user identification module (UIM), a subscriber identity module (SIM) ), A Universal Subscriber Identity Module (" USIM "), and the like. In addition, an apparatus having an identification module (hereinafter referred to as 'identification device') can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the port. The interface unit 170 receives data from an external device or receives power from the external device to transfer the data to each component in the mobile terminal 100 or to transmit data in the mobile terminal 100 to an external device.

The interface unit 170 may be a path through which power from the cradle is supplied to the mobile terminal 100 when the mobile terminal 100 is connected to an external cradle or various command signals input from the cradle by the user It can be a passage to be transmitted to the mobile terminal. The various command signals or power input from the cradle may be operated as a signal for recognizing that the mobile terminal is correctly mounted on the cradle.

The output unit 150 is for outputting an audio signal, a video signal, or an alarm signal, and may include a display unit 151, an audio output module 152, and an alarm output module 153 have.

The display unit 151 displays and outputs information processed by the mobile terminal 100. For example, when the mobile terminal is in the call mode, a user interface (UI) or a graphical user interface (GUI) associated with a call is displayed. And displays the captured or / and received image or UI and GUI.

Meanwhile, as described above, when the display unit 151 and the touch pad have a mutual layer structure to constitute a touch screen, the display module 151 can be used as an input device in addition to the output device. The display unit 151 may be a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, a three-dimensional display 3D display). Some of these displays can be configured to be transparent so that they can be viewed from outside. This can be referred to as a transparent display. A typical example of the transparent display is a transparent LCD or the like. In addition, there may be two or more display units 151 according to the mode of implementation of the mobile terminal 100. The touch screen can be configured to detect not only the touch input position and area but also the touch input pressure.

The audio output module 152 outputs audio data received from the wireless communication unit 110 or stored in the memory unit 160 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output module 152 outputs an acoustic signal related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the mobile terminal 100. [ The sound output module 152 may include a speaker, a buzzer, and the like.

The alarm unit 153 outputs a signal for notifying the occurrence of an event of the mobile terminal 100. Examples of events that occur in the mobile terminal include call signal reception, message reception, key signal input, touch input, and the like. The alarm unit 153 may output a signal for notifying the occurrence of an event in a form other than an audio signal or a video signal. For example, it is possible to output a signal in a vibration mode. When a call signal is received or a message is received, the alarm unit 153 can output a vibration to notify it. Alternatively, when the key signal is input, the alarm unit 153 can output the vibration by the feedback to the key signal input. The user can recognize the occurrence of an event through the vibration output as described above. Of course, a signal for notifying the occurrence of an event may also be output through the display unit 151 or the audio output module 152.

The memory unit 160 may store a program for processing and controlling the control unit 180 and may store a program for temporarily storing input / output data (e.g., a phone book, a message, a still image, Function may be performed. In addition, the memory unit 160 may store data related to vibration and sound of various patterns output upon touch input on the touch screen.

The memory unit 160 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory) A random access memory (SRAM), a read only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM) , An optical disc, and the like. Also, the mobile terminal 100 may operate a web storage that performs a storage function of the memory unit 160 on the Internet.

The control unit 180 typically controls the overall operation of the mobile terminal. For example, voice communication, data communication, video communication, and the like. In addition, the control unit 180 may include a multimedia module 181 for multimedia playback. The multimedia module 181 may be implemented in the control unit 180 or may be implemented separately from the control unit 180. [

The control unit 180 can perform a pattern recognition process for recognizing the handwriting input or drawing input performed on the touch screen as characters and images, respectively.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power necessary for operation of the respective components.

The power supply unit 190 includes a battery 191 and a solar cell 192 so as to generate electricity and charge the battery 191 with electricity generated by the solar cell 192. The electricity charged in the battery 191 is provided in operation of each component or circuit of the mobile terminal 100 under the control of the controller 180.

Some of the embodiments described herein may be implemented in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof. By way of software implementation, embodiments such as procedures or functions may be implemented with separate software modules that perform at least one function or operation. The software code may be implemented by a software application written in a suitable programming language. Also, the software codes may be stored in the memory unit 160 and executed by the control unit 180. [

Hereinafter, the structure or form of the mobile terminal according to the present invention will be described in detail with reference to FIGS. 2 to 5. FIG.

2 is a front perspective view of a mobile terminal according to the present invention. Referring to FIG. 2, the mobile terminal 200 includes a 'bar' type terminal body 201. However, the present invention is not limited to the bar type mobile terminal disclosed in FIG. 2, but may be a 'folder' type in which two terminal bodies are foldably connected, a 'slide' Type or a mobile terminal having a form factor.

The casing (casing, housing, cover, etc.) constituting the external appearance of the terminal body 201 is formed by the front case and the rear case. Various electronic components are embedded in the space formed by the front case and the rear case. At least one intermediate case 104 may be additionally disposed between the front case and the rear case. The cases may be formed by injection molding of a synthetic resin, or may be made of a metal material, for example, a material such as stainless steel (STS) or titanium (Ti), or a ceramic.

A display unit 211, an acoustic output unit 212, an image input unit 214, an acoustic input unit 213, and the like may be disposed on a front surface of the terminal body 201. The first operation unit 220,

The first operation unit 220 receives a command for controlling the operation of the mobile terminal related to the present invention. Referring to FIG. 2, the first operation unit 220 includes a numeric key or a character key, and has a predetermined area. The area of the first operation unit 220 can be utilized as an area capable of receiving solar energy, as will be described later. The first operation unit 220 may be called a 'keypad'.

The display unit 211 includes an LCD (Liquid Crystal Display) module, an OLED (Organic Light Emitting Diodes) module, an e-paper, a TOLED (Transparent OLED), etc. for visually expressing information. Also, the display unit 211 includes touch sensing means to receive information or control commands by the user's touch. The touch sensing means may include a transparent electrode film disposed inside the window, and a resistance film method or an electrostatic method may be applied.

The sound output unit 212 may be implemented in the form of a receiver or a loudspeaker.

The image input unit 214 may be implemented in the form of a camera module for capturing an image or a moving image of a user.

The sound input unit 213 may be implemented in the form of a microphone, for example, to receive a user's voice, other sounds, and the like. The sound input unit 213 may be disposed on a side surface of the terminal body 201.

As shown in FIG. 2, a second operating unit 216, an interface unit 215, and the like may be disposed on a side surface of the mobile terminal 100.

The second operating portion 216 may be installed on a side surface of the terminal body 201. The second operating portion 216 together with the first operating portion 220 may be collectively referred to as a manipulating portion and may be employed in any manner as long as the user operates in a tactile manner. For example, the operation unit may be implemented by a dome switch or a touch screen, a touch pad, or a wheel, a jog type, a joystick, or the like, As shown in FIG.

In the functional aspect, the first operation unit 220 is for inputting information such as numbers, characters, symbols, or a menu such as start, end, etc., and the second operation unit 216 is for inputting, And may act as a hot-key to perform special functions such as activation.

The interface unit 215 is a path for allowing the mobile terminal 200 to exchange data with an external device. For example, the interface unit 215 may be a wired or wireless connection terminal for connecting to an earphone, a port for short-range communication (for example, an IrDA port, a Bluetooth port, a wireless LAN port a wireless Lan port), or power supply terminals for supplying power to the mobile terminal. The interface unit 215 may be a card socket that accommodates an external card such as a SIM (subscriber identification module) or a UIM (user identity module), a memory card for information storage, and the like.

At one side of the terminal body 201, an antenna for receiving broadcast signals may be arranged in addition to an antenna for communication. The antenna may be installed to be rotatable after being drawn out or drawn out to the rear case.

FIG. 3 is an enlarged perspective view of a part of a keypad according to the present invention, and FIG. 4 is a sectional view taken along a line IV-IV of the keypad of FIG.

As shown in these drawings, the keypad 220 related to the present invention includes a plurality of key assemblies engraved with numbers or letters 221 so as to recognize input contents. Each key assembly includes a switch 250 at its lower portion as shown in FIG. 4 or 5, so that when a key is pressed, the number or letter 221 corresponding to the key is input or a corresponding function is executed. The switch 250 shown in Fig. 4 is formed in a dome shape, and is easy to generate click feeling. The plurality of switches 250 may be formed on one circuit board 260. The circuit board 260 may be formed of a rigid circuit board, and may be formed in the form of a flexible printed circuit board (FPCB) to reduce the thickness.

Each key 223 has a substrate portion 231 on which a solar cell 230 and a solar cell 230 are mounted. The solar cell 230 and the substrate portion 231 are arranged for each key 223 so as not to interfere with the depression of the key 223 and the substrate portion 231 adjacent to each substrate portion 231 is connected to the connection portion 232).

The pushing protrusion 240 may be formed on the lower surface of the substrate portion 231 or on the upper surface of the switch 250 in order to precisely press the switch 250. The pushing protrusion 240 may be formed by fusing and fixing a material such as silicone rubber to the lower surface of the substrate portion 231 or by fusing the same on the upper surface of the switch 250.

For operation of the solar cell 230, each key 223 is formed to be transparent. The key 223 may be formed by processing a light-transmissive resin, tempered glass, or jewels. All of the keys 223 are formed so that the solar cell 230 can receive the maximum amount of sunlight.

The plurality of transparent keys 223 may be adhered to the top of each solar cell 230 by means such as an adhesive or may be disposed apart from each solar cell 230 with a certain distance. Further, the transparent key 223 may be formed directly on the solar cell 230, so that a separate adhesive may not be required. For this purpose, the light transmitting key 223 can be manufactured in such a manner that the light transmitting key 223 is placed in a liquid state on the upper part of the solar cell 230 and then cured by ultraviolet irradiation (ultraviolet curing).

The translucent key 223 may be made of a material having a relatively high degree of hardness in order to prevent deterioration of light transmittance due to repetitive use or external impact or scratches. Even if an ultraviolet ray hardening resin is used, a high hardness can be adopted.

The solar cell 230 disposed inside the transparent key 223, together with the substrate portion 231 for supporting the solar cell 230, converts solar energy irradiated onto the area of the key into electric energy. As the number of the keys 223 is arranged, the size is also reduced, so that the amount of electricity generated by each solar cell 230 may not be large. For this purpose, each solar cell 230 can be connected in series. As shown in FIG. 4, the connection unit 232 is configured to have a sufficient voltage when the entirety of the keypad 220 is viewed by connecting adjacent solar cells 230. The connection part 232 may be formed in a flexible substrate shape so as to minimize the influence of the solar cell 230 upon the pressing of the light-transmitting key 223.

The light transmitting key 223 may be integrally connected as a whole in order to prevent foreign matter or moisture from entering the inside of the keypad 220. FIG. 4 shows an example in which all the light-transmitting keys 223 are integrally connected. A groove 224 for forming a relatively thin thickness is formed between the transparent key 223 and the transparent key 223 so that the transparent key 223 can be easily pressed. The groove 224 may be formed in the process of forming the transparent key 223 or may be formed by a method of cutting after the transparent key 223 is formed.

A letter or numeral 221 engraved in each key 223 is formed to be transmissive so as to minimize transmission of sunlight. Such letters or numbers 221 may be formed in a form attached to the key 223 as shown in FIG. In this case, it can be formed by a method of ultraviolet curing described above.

As shown in FIG. 4, the number or letter 221 formed by embossing is designed to easily recognize the shape by the difference in height between the protruded portion and the peripheral portion.

Each letter or numeral 221 is made translucent so that it is difficult to recognize it in a dark surrounding environment while the solar cell 230 is generally opaque. Backlighting "). 4, an LED or other illumination means 265 is disposed on the circuit board 260 and a gap or groove between the solar cell 230 and the solar cell 230 is formed by the illumination means 265. [ The light source 224 and the like are illuminated, so that the letter or number 221 can be indirectly illuminated.

5 is a cross-sectional view showing a second embodiment of a keypad according to the present invention. 5, numbers or letters 321 engraved on the upper surface of the transparent key 323 forming the keypad 320 are formed. In particular, the light emitting portion 365 is disposed on the side of the light transmitting key 323 for backlighting of the number or letter 321. [ To this end, the plurality of light transmitting keys 323 are integrally connected and may be formed in the form of a light guide plate or a light guide film. Accordingly, the light emitted from the light emitting unit 365 is shifted laterally along the light-transmitting key 323, and is scattered by a groove 324 formed with a complicated shape or curvature or letters or numbers 321 formed in a negative shape, Brighten the area.

A scattering sheet may be mounted between the groove 324 or between the solar cell 330 and the solar cell 330 in order to more easily scatter the light of the light emitting unit 365.

The remaining components are numbered similar to those of the first embodiment, and a detailed description thereof is omitted in the description of the previous embodiment.

6 is a cross-sectional view showing a third embodiment of a keypad according to the present invention. 6, the light emitting portion 465 is disposed on the lower surface of the substrate portion 431. [ A light guide plate or light guide sheet 435 is attached to a lower surface of the base plate portion 431 in order to guide the light emitted from the light emitting portion 465 toward the groove 424. The light emitted from the light emitting portion 465 moves laterally along the light guide sheet 435 and illuminates the gap between the solar cells 430 or the groove 424, 421). With such a configuration, the light emitting unit 465 can be manufactured in a modular form together with the substrate unit 431 for driving the solar cell 430, thereby facilitating manufacture and reducing the production cost.

7 is a flowchart illustrating a method of backlighting according to driving of a solar cell according to an embodiment of the present invention.

The control unit 180 illustrated in FIG. 1 may be configured to change the brightness or color of the light emitting units 265, 365, and 465 described in FIGS. 4 to 6 according to the amount of charge charged by the solar cells 230, 330, and 430.

That is, first, when the keypad solar cell 230 is operated (S10), the light emitting units 265, 365, and 465 for backlighting the keypads 220, 320, and 420 according to whether the solar cells 230, ) Can be implemented differently. For example, when the production of electric power by the solar cells 230, 330, and 430 is not smooth, it is caused by the surrounding darkness, so that the backlighting can be performed by operating the light emitting units 265, 365, and 465, By changing the hue of the light emitting portions 265, 365, and 465 according to the degree of production of the solar cells 230, 330, and 430, the user can easily recognize the degree of filling by the solar cells 230, When the operation of the solar cells 230, 330, and 430 is smooth in a bright place, the backlighting by the light emitting units 265, 365, and 465 may be difficult to recognize. Therefore, It is also possible to do.

The mobile terminal described above can be applied to not only the configuration and method of the embodiments described above but also all or some of the embodiments may be selectively combined so that various modifications may be made to the embodiments It is possible.

1 is a block diagram of a mobile terminal according to the present invention;

2 is a front perspective view of a mobile terminal according to the present invention.

Figure 3 is an enlarged perspective view of a portion of a keypad associated with the present invention;

4 is a cross-sectional view taken along line IV-IV of the keypad of Fig. 3

5 is a cross-sectional view showing a second embodiment of a keypad according to the present invention.

6 is a cross-sectional view showing a third embodiment of a keypad according to the present invention

7 is a flowchart illustrating a method of backlighting according to driving of a solar cell,

Claims (12)

A circuit board on which a plurality of switches are mounted; And a key assembly disposed on the circuit board and configured to depress the switch, A plurality of substrate portions arranged for each of the switches so as to press the switches; A plurality of solar cells disposed on top of each of the substrate portions; A plurality of light-transmitting keys disposed on top of each of the solar cells; At least one connection portion connecting the plurality of substrate portions; A light emitting unit for illuminating the translucent key; And And a control unit configured to change the brightness or color of the light emitting unit according to whether the solar cell is charged or charged according to whether the solar cell is charged or not, . The method according to claim 1, Wherein the key is formed by engraving letters or numbers on a light-transmitting member with engraved engraving. The method according to claim 1, Wherein the key is formed by projecting letters or numbers on a light-transmitting member in an embossed state. The method according to claim 2 or 3, Wherein the key is formed by a light transmitting resin or glass. The method according to claim 1, Wherein the connection portion is formed in the form of a flexible substrate. The method according to claim 1, Wherein a gap is formed between the solar cell and the adjacent solar cell so that light can pass therethrough. delete The method according to claim 1, Wherein the light emitting unit is mounted on the substrate unit. The method according to claim 1, Wherein the light emitting unit is mounted on a circuit board on which the switch is mounted. 10. A method according to any one of claims 8 and 9, Wherein the light emitting unit is disposed for each of the light transmitting keys. delete The method according to claim 1, Wherein the light transmitting key is directly attached to an upper surface of the solar cell.

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