KR20110024261A - Portable terminal - Google Patents

Abstract

PURPOSE: A mobile terminal is provided to prevent an electrical collision between solar cells arranged in the sides of the mobile terminal. CONSTITUTION: A first and a second solar cells(131,132) are installed to a first and a second sides of a mobile terminal. The first and the second solar cells change the light energy into the electrical energy. A charging unit(133) is connected to first and a second lines which are connected with the first and the second solar cells. The charging unit charges the battery. If the generate current levels from the first and the second cells are different from each other, a control unit matches the current level from the first and the second lines to the same level.

Description

Mobile terminal {PORTABLE TERMINAL}

The present invention relates to a portable terminal having solar cells arranged on a plurality of surfaces.

A portable terminal is a portable device that is portable and has one or more functions such as voice and video calling, information input and output, and data storage.

As the functions are diversified, for example, the mobile terminal has complex functions such as taking a picture or video, playing a music or video file, playing a game, and receiving a broadcast, and is realized in the form of a comprehensive multimedia player. It is becoming.

Many new attempts are being applied to these multimedia devices in terms of hardware or software to implement complex functions. For example, a user interface environment is provided for a user to easily and conveniently search for or select a function.

In addition, while a mobile terminal is regarded as a personal portable device for expressing its individuality, various designs are required.

Recently, as interest in electronic devices to which eco-friendly technology is applied increases, the case of applying solar cells to portable terminals is increasing. Such a solar cell is configured to charge a portable terminal using sunlight.

The present invention is to prevent the electrical collision between the solar cells disposed on a plurality of surfaces of the terminal and to maximize the amount of charge.

The present invention for realizing the above object is provided with a first and second surfaces different from each other, and a terminal body having a battery, and a first mounted on the first and second surfaces, respectively, and converting light energy into electrical energy And a charging unit for charging the battery, wherein the second solar cell and the first and second lines respectively connected to the first and second solar cells are assembled at an assembly position and connected to a single line. Disclosed is a portable terminal including a controller for equally matching current amounts of first and second lines supplied to the assembly position under specific conditions when the amounts of current generated in the solar cells are different from each other.

The portable terminal may further include a current monitor configured to measure first and second current amounts generated by the first and second solar cells, respectively, and the controller may control the first and second current amounts supplied to the assembly position. It can be matched to the smaller of 2 currents.

The specific condition may be a condition in which a larger amount of current among the first and second amounts of electricity is smaller than a value twice as large as a small amount of current.

The first and second lines may be further provided with first and second switching units for opening and closing the first and second lines, respectively.

The controller may be configured to turn off any one of the first and second switching units when the amount of current does not satisfy the specific condition.

The control unit may be configured to turn off any one of the first and second switching units when either one of the first and second solar cells does not generate electrical energy.

The first and second illuminance sensors may additionally be provided on the first and second surfaces to sense the brightness of light, and the controller may further include first and second illuminance sensors based on sensing values of the first and second illuminance sensors. The amount of current generated in the solar cell can be detected.

The battery may include a plurality of battery cells connected in parallel to the charging unit, and a matching unit for impedance matching of the battery cells may be connected to the battery cells.

The present invention is connected to the first and second lines by matching the current amounts of the first and second lines to be supplied to the assembly position under specific conditions when the current amounts generated in the first and second solar cells are different. While preventing electric collision of the first and second solar cells, it is possible to maximize the amount of charge.

In addition, the present invention can minimize the power loss by performing impedance matching of the battery cells connected in parallel to the charging unit through a pulse width modulation method.

Hereinafter, a portable terminal according to the present invention will be described in detail with reference to the drawings.

Hereinafter, a portable terminal according to the present invention will be described in detail with reference to the drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description thereof is replaced with the first description.

Hereinafter, a portable terminal according to the present invention will be described in detail with reference to the drawings. The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, it should be noted that "module" and "unit" may be used interchangeably.

The portable terminal can be implemented in various forms. For example, the mobile terminal described in the present specification may be a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, or the like. It can be implemented as.

Referring to FIG. 1, a portable terminal includes a first body 110 and a second body 120 that are foldably coupled to each other. However, the present invention is not limited to the portable terminal of the "folder type" disclosed in FIG.

According to the present embodiment, the first body 110 and the second body 120 are rotatably connected through the hinge connecting portion 119. Inside the hinge connector 119, a cam device for providing an elastic force in the process of rotating the first body 110 and a connecting means for electrically connecting the first body 110 and the second body 120 to be provided. Can be.

A state in which the first body 110 is disposed to overlap with the second body 120 may be referred to as a folding configuration, and as shown in the drawing, the first body 10 may correspond to the second body 20. The exposed state of at least a portion of) may be referred to as an unfolding configuration.

The portable terminal operates mainly in the standby mode in the closed state, but the standby mode may be released by the user's operation. In addition, the portable terminal operates mainly in a call mode or the like in an open state, but may be switched to a standby mode by a user's operation or a lapse of a predetermined time.

The case (casing, housing, cover, etc.) forming the exterior of the first body 110 is formed by the front case 111 and the rear case 112. Various electronic components are embedded in the space formed by the front case 111 and the rear case 112.

At least one intermediate case may be further disposed between the front case 111 and the rear case 112.

The cases may be formed by injecting synthetic resin or may be formed of a metal material, for example, a metal material such as stainless steel (STS) or titanium (Ti).

The display body 113, the first sound output unit 115, the first image input unit 114, and the like may be disposed on the first body 110, specifically, the front case 111.

The display unit 113 includes a liquid crystal display (LCD) module, an organic light emitting diodes (OLED) module, and the like, which visually express information, and the display unit 113 further includes a touch screen. It is also possible to enable the input of information.

The first sound output unit 115 may be implemented in the form of a receiver or a speaker, and the first image input unit 114 may be in the form of a camera module for capturing an image or a video for a user. Can be implemented.

Like the first body 110, the front case 121 and the rear case 122 may form a case of the second body 120. First and second manipulation units 123 and 124 may be disposed on the front surface of the second body 120, specifically, the front case 121.

The third manipulation unit 125, the sound input unit 126, and the interface 127 may be disposed in at least one of the front case 121 and the rear case 122.

The first to third manipulation units 123, 124, and 125 may be collectively referred to as manipulating portions, and may be employed in any manner as long as the user is tactile in a tactile manner.

For example, the operation unit may be implemented as a dome switch or a touch screen that can receive a command or information by a user's push or touch operation, a touch pad, a wheel that rotates keys, a jog method, or a method such as a joystick. It can also be implemented as.

This embodiment illustrates the first and second manipulation units 123 and 124 in the form of a keypad, and the third manipulation unit 125 in the form of a side key.

In the functional aspect, the first operation unit 123 is for inputting a command such as start, end, scroll, etc., and the second operation unit 124 is for inputting numbers, letters, symbols, and the like. In addition, the third manipulation unit 125 may operate as a hot-key that performs a special function such as activation of the first image input unit 114.

The sound input unit 126 may be implemented in the form of, for example, a microphone to receive a user's voice, other sounds, and the like.

The interface 127 serves as a passage for allowing a portable terminal related to the present invention to exchange data with an external device. For example, the interface 127 is a wired or wireless connection, a connection terminal for connecting to the earphone, a port for short-range communication (for example, an infrared port (IrDA port), Bluetooth port (Bluetooth port), wireless LAN port ( wireless LAN port), or at least one of power supply terminals for supplying power to the mobile terminal.

The interface 127 may be a card socket for receiving an external card such as a subscriber identification module (SIM) or a user identity module (UIM), a memory card for storing information.

2 is a rear perspective view of the portable terminal of FIG. 1.

2, the second image input unit 116 of the first body 120 may be additionally mounted.

The second image input unit 116 may be a camera having a photographing direction substantially opposite to that of the first image input unit 115 (see FIG. 1) and having different pixels from the first image input unit 115.

For example, the first video input unit 115 has a low pixel so that it is easy to take a picture of a user and transmit it to a counterpart in a video call, and the second video input unit 116 immediately photographs a general subject. It is preferable to have a high pixel because it is not transmitted in many cases.

When the second image input unit 116 is not provided separately, the first image input unit 115 may be rotatably formed so as to allow shooting up to the shooting direction of the second image input unit 128.

The second sound output unit 128 may be further disposed on the rear case 122 of the second body 120. The second sound output unit 128 may implement a stereo function together with the first sound output unit 114 (refer to FIG. 1), and may be used for a call in the speakerphone mode.

At least one of the first and second bodies 110 and 120 may be equipped with illumination sensors 151 and 152 for detecting the brightness of light. The illumination sensor senses the illumination around the terminal and adjusts the brightness of the display unit and the brightness of the second and third manipulation units 123 and 124 using the illumination.

The illuminance sensors 151 and 152 may include a first illuminance sensor 151 mounted on the rear case 112 of the first body 110 and a second illuminance sensor mounted on the rear case 122 of the second body 120. 152). The illuminance sensors 151 and 152 are always exposed to the outside regardless of the open state and the closed state of the terminal, and they may be operated in association with the solar cell described below.

On the rear case 122 side, a power supply unit 129 (see FIG. 10) for supplying power to the portable terminal is mounted. The power supply unit 129 may be detachably coupled for charging, for example, as a rechargeable battery. According to the present embodiment, the rear case 122 is detachably mounted with a battery cover 129a for covering the battery.

On the other hand, the portable terminal of the present invention includes a solar cell for converting optical energy into electrical energy. A solar cell refers to a semiconductor device that converts light energy into electrical energy using a photovoltaic effect. Solar cells can be classified into silicon solar cells and compound semiconductor solar cells, all of which will be applicable to the present invention.

The mobile terminal related to the present invention includes a plurality of solar cells at a plurality of locations. As an example, as shown in FIG. 2, the first solar cell 131 is provided in the first body 110, and the second solar cell 132 is provided in the second body 120.

3 is a side view of a mobile terminal according to an embodiment of the present invention.

As shown in FIG. 3, the first and second solar cells 131 and 132 are mounted on different surfaces of the terminal bodies 110 and 120, that is, the first and second surfaces S1 and S2. The first and second surfaces S1 and S2 may be in opposite directions, and the first and second solar cells 131 and 132 are always exposed to the outside regardless of the open and closed states of the portable terminal. It is exposed to ambient light.

As described above, the first and second illuminance sensors 151 and 152 may be mounted on the first surface S1 and the second surface S2, respectively.

In the present embodiment, the outer surfaces of the first and second bodies 110 and 120 are illustrated as examples of the first and second surfaces S1 and S2, but the present invention is not limited thereto and the terminal bodies 110 and 120 may be used. If different surfaces of, all may correspond to the first and second surfaces (S1, S2). For example, when the portable terminal is formed in a bar type, the front and rear surfaces of the portable terminal may correspond to the first surface S1 and the second surface S2, respectively.

The first and second solar cells 131 and 132 generate electric energy using incident light energy, and the electric energy may be used to charge the battery 129 (power supply). According to the present invention, since the mounting positions of the first and second solar cells 131 and 132 are different from each other, the amount of incident light energy may also vary depending on the position of the terminal and the posture of the terminal. In this case, the amount of electrical energy generated by the first and second solar cells 131 and 132, for example, the amount of current, is different from each other.

4 is a block diagram illustrating a configuration related to battery charging using first and second solar cells.

Referring to FIG. 4, the charging unit 133 is connected to the first and second solar cells 131 and 132, and the charging unit 133 is connected to the battery 129. The charging unit 133 charges the battery 129 by supplying currents generated from the first and second solar cells 131 and 132 to the battery 129.

The first line 134 is connected to the first solar cell 131, and the second line 135 is connected to the second solar cell 132. In order to unify the lines for supplying current to the charging unit 133, the first and second lines 134 and 135 are assembled at a specific assembly position. The first and second lines 134 and 135 are assembled at an assembly position and connected to the charging unit 133 as a single line 136.

When the amounts of current generated by the first and second solar cells 131 and 132 are different from each other, currents having different amounts of current flow through the first and second lines 134 and 135. Accordingly, there is a possibility that a current flowing through any one of the first and second lines 134 and 135 flows to the other to flow backward. The reversed current may adversely affect the operation of the first and second solar cells 131 and 132.

The present invention includes a control unit 170 (refer to FIG. 10) for equally matching the amount of currents of the first and second lines 134 and 135 supplied to the assembly position under specific conditions.

Hereinafter, for convenience of description, the amount of current generated in the first solar cell 131 is referred to as a 'first current amount', and the amount of current generated in the second solar cell 132 is referred to as a 'second current amount'. Shall be.

The mobile terminal may be equipped with a current monitor for measuring the first and second current amounts. The current monitor is connected to the first and second solar cells 131 and 132, measures the first and second current amounts, and applies them to the controller 170.

The controller 170 controls the current amounts of the first and second lines 134 and 135 supplied to the assembly position based on the first and second current amounts.

The first and second illuminance sensors 151 and 152 may be used instead of the current monitor to measure the first and second current amounts. If the peripheral brightness of the first surface S1 is brighter than the second surface S2, the light energy incident on the first surface S1 will be greater than that of the second surface S2. That is, the amount of current generated by the first and second solar cells 131 and 132 may be detected by using the illuminance and the amount of current generated by the solar cells 131 and 132 in a proportional relationship. The relative relationship or ratio between the ambient illuminance and the solar energy is calculated in advance and stored in the memory 174, and the control unit 170 uses the sensing values of the illuminance sensors 151 and 152 and the information and the first and second solar cells 131 and 132. Can detect the amount of current generated.

First and second switching units 141 and 142 may be additionally provided in the first and second lines 134 and 135 to open and close them, respectively. The controller 170 may selectively open and close the first and second switching units 141 and 142 so that only the current flowing in any one of the first and second lines is supplied to the charging unit 133.

In addition, the first and second switching units 141 and 142 may be configured to prevent current from flowing back toward the first and second solar cells 131 and 132 at an assembly position. This is to prevent the current from flowing backward even when no matching is performed by the controller 170. The first and second switching units 141 and 142 may be implemented in various forms, such as a diode and a field effect transistor (FET).

5 to 7 are block diagrams illustrating operating states of a mobile terminal according to an embodiment of the present invention.

5 illustrates a case where the amount of current generated by the first and second solar cells 131 and 132 is the same. 5 illustrates a case where the first and second current amounts are 50 mA, respectively.

As such, when the amount of current generated by the first and second solar cells 131 and 132 is the same, it is not necessary to match the amount of current flowing through the first and second lines 134 and 135. The same amount of current flows in the first and second lines 134 and 135, and there is no possibility of current backflow. Therefore, in this case, the controller 170 does not perform a matching operation.

6 illustrates a case in which the controller 170 performs a matching operation. The controller 170 performs a matching operation under a specific condition, in order to maximize the sum of the amount of current supplied from the first and second lines 134 and 135, that is, the sum of the first and second current amounts.

Such a specific condition may be a condition under which the first and second current amounts are smaller than a value which is twice the amount of the small current amount among the first and second current amounts. When the condition is satisfied, the controller 170 matches the current amounts of the first and second lines 134 and 135 supplied to the assembly position to a smaller value among the first and second current amounts.

6 illustrates a case where the first current amount is 60 mA and the second current amount is 40 mA. Since the first and second current amounts are different from each other, and 60 mA, which is the larger current amount among the first and second current amounts, is smaller than twice (80 mA) the small current amount, 40 mA, the first and second current amounts satisfy the above conditions. . Accordingly, the controller 170 performs a matching operation, and the controller 170 may match the current amounts of the first and second lines 134 and 135 to 40 mA, which is the smaller of the first and second current amounts, to match the first and second aspects. The batteries 131 and 132 are controlled.

By the matching operation as described above, 80 mA, which is the sum of the amount of currents supplied to the assembly position, is supplied to the charging unit 133. Accordingly, the reverse current flow can be prevented and the maximum current can be supplied to the charging unit 133.

7 shows a case in which either one of the first and second switching units is selectively turned off.

When the first and second current amounts are different from each other, the controller 170 may turn off any one of the first and second switching units 141 and 142 if the first and second current amounts do not satisfy the specific condition. That is, the controller 170 selectively turns off the first and second switching units 141 and 142 to selectively open the first and second lines 134 and 135.

7 exemplifies a case where the first current amount is 80 mA and the second current amount is 20 mA. Since the first and second current amounts are different from each other, and the larger current amount of 80 mA among the first and second current amounts is greater than twice (40 mA) the smaller amount of 20 mA, the first and second current amounts do not satisfy the above conditions. .

Accordingly, the controller 170 controls the second switching unit 142 to be turned off to open the second line 135 through which a small current among the first and second current amounts flows. Therefore, only 80 mA flowing through the first line is supplied to the charging unit 133.

According to the present invention, the currents of the first and second lines 134 and 135 are matched according to a specific condition as described above, and the first and second switching units 141 and 142 are selectively turned off when a specific condition is deviated, thereby causing no current backflow. Make sure that the maximum amount of current is supplied to the battery to the extent that it does not.

The controller 170 may turn off any one of the first and second switching units 141 and 142 even when one of the first and second solar cells 131 and 132 does not generate electrical energy. For example, when the second surface S2 of the terminal contacts the bottom (ground) and no current is generated in the second solar cell 132, the controller turns off the second switching unit 142 to turn off the second line ( 135) to open. Accordingly, only the current generated by the first solar cell 131 is supplied to the charging unit 133.

8 is a view schematically showing the configuration of a battery, Figure 9 is a view for explaining the operation of the matching unit.

The battery 129 may include a plurality of battery cells 129a, 129b, and 129c. The battery cells 129a, 129b, and 129c may be connected to the charging unit 133 in parallel.

These battery cells 129a, 129b, and 129c have slightly different resistance values, and impedance matching is required to charge them with the same power. Therefore, matching units 161a, 161b, and 161c for impedance matching are connected to the battery cells 129a, 129b, and 129c.

Impedance matching may be performed by connecting a variable resistor to the battery cells 129a, 129b, and 129c, but the present invention adjusts the amount of current supplied to the battery cells 129a, 129b, and 129c by a pulse width modulation method. 161a, 161b, and 161c are applied to minimize power loss.

9 illustrates a concept of current amount control through a pulse width modulation method. The controller 170 may control the matching units 161a, 161b, and 161c to repeatedly generate a pulse signal as shown in FIG. 9.

In FIG. 9, the period of the pulse signal is represented by 'T' and the pulse width is represented by 'W'. The ratio of the pulse width W to the period T may be referred to as a duty ratio.

The controller 170 applies information about resistance values of the battery cells 129a, 129b, and 129c to the matching units 161a, 161b, and 161c, and the matching units 161a, 161b, and 161c are different from each other. And to generate a pulse rate duty cycle signal. The matching units 161a, 161b, and 161c are configured to repeatedly open and connect a line corresponding to the duty rate, so that a current amount proportional to the duty rate may be supplied to the battery cells 129a, 129b, and 129c. .

For example, the amount of current output from the charging unit 133 is 100 mA, and the duty ratios of the matching units 161a, 161b, and 161c of FIG. 8 are 70% and 80%, respectively. If it is 90%, the amount of current supplied to each of the battery cells 129a, 129b, and 129c becomes 70 mA, 80 mA, and 90 mA.

As described above, in the present invention, power loss may be minimized by performing impedance matching of the battery cells 129a, 129b, and 129c using a pulse width modulation scheme.

Meanwhile, although the first and second solar cells 131 and 132 are applied to a portable terminal having a folder type, the first and second surfaces of different types of terminals, such as a bar type, a slide type, and a swing type, are illustrated. It is also possible to apply a solar cell, and all the concepts described above may be applied thereto.

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

Referring to FIG. 10, a mobile terminal according to an embodiment of the present invention may include a wireless communication module 171, an operation unit 123, 124, 125, an image input unit 115, 116, an audio input unit 126, a display unit 113, and an audio output unit. It includes the 114, 128, the sensing unit 176, the interface 127, the broadcast receiving module 175, the memory 174, the power supply unit 129, the control unit 170.

The controller 170 typically controls the overall operation of the mobile terminal. For example, it performs related control and processing for voice call, data communication, video call and so on.

In connection with the present invention, when the current amounts generated in the first and second solar cells 131 and 132 are different from each other, the controller 170 equally matches the current amounts of the first and second lines 134 and 135 under specific conditions.

The wireless communication module 171 transmits / receives a radio signal with a mobile communication base station through an antenna. For example, under the control of the controller 170, the transmitter 173 is responsible for transmitting and receiving voice data, text data, image data, and control data, and modulates and transmits a signal to be transmitted, and a receiver for demodulating the received signal. 172).

The operation units 123, 124, and 125 are configured as shown in FIG. 1 to provide the control unit 160 with key input data input by the user for controlling the operation of the terminal. The operation units 123, 124, and 125 are composed of a dome switch, a touch pad (static pressure / capacitance), a jog wheel, a jog switch, and the like.

The image input units 115 and 116 process image frames such as still images or moving images obtained by an image sensor in a video call mode or a photographing mode. The processed image frame is converted into image data displayable on the display unit 113 and output to the display unit 113.

The image frames processed by the image input units 115 and 116 are stored in the memory 174 or transmitted to the outside through the wireless communication module 171 under the control of the controller 170.

The sound input unit 126 receives an external sound signal by a microphone in a call mode, a recording mode, a voice recognition mode, etc., and processes the external sound signal as electrical voice data. In the case of the call mode, the processed voice data is converted into a form transmittable to the mobile communication base station through the wireless communication module 171 and output to the wireless communication module. In the recording mode, the processed voice data is output to be stored in the memory 174.

The sound input unit 126 may implement various noise removing algorithms for removing noise generated in the process of receiving an external sound signal.

The display 113 displays and outputs information processed by the portable terminal. For example, when the mobile terminal is in a call mode, the control unit 170 displays and outputs a user interface (UI) or a graphic user interface (GUI) related to the call. When the mobile terminal is in the video call mode or the photographing mode, the mobile terminal displays and outputs the captured image, UI, or GUI under the control of the controller 170. When the display unit 113 includes a touch screen, the display unit 113 is used as an input device in addition to the output device.

The sound output units 114 and 128 are provided to the sound data or the memory 174 received from the wireless communication module 161 under the control of the control unit 170 in a call signal reception, a call mode or a recording mode, a voice recognition mode, and a broadcast reception mode. The stored sound data is converted and output to the outside.

In addition, the sound output units 114 and 128 output sound signals related to functions (eg, call signal reception sound, message reception sound, etc.) performed in the portable terminal. The sound output units 114 and 128 include a speaker, a receiver, a buzzer, and the like.

The sensing unit 176 generates a sensing signal for controlling the operation of the portable terminal by detecting the current state of the portable terminal such as the open / closed state of the portable terminal, the position of the portable terminal, the presence or absence of a user contact. For example, by sensing whether the portable terminal is in a folded state or an unfolded state, the sensing result is output to the controller 170 to control the operation of the terminal. In addition, it is responsible for sensing functions related to whether the power supply unit 129 is powered, whether the interface 126 is coupled to an external device.

The interface 127 may be connected to a mobile terminal such as a wired / wireless headset, an external charger, a wired / wireless data port, a card socket (eg, a memory card, a SIM / UIM card), or the like. It serves as an interface with the device. The interface 127 receives data from an external device or receives power and transfers the data to each component inside the portable terminal or transmits data within the portable terminal to the external device.

The memory 174 may store a program for processing and controlling the controller 170, and provides a function for temporarily storing input / output data (eg, a phone book, a message, a still image, a video, etc.). It can also be done.

In addition, the memory 174 stores a program for controlling the operation of the portable terminal according to the present invention.

This memory 174 includes concepts such as hard disks, card type memory (eg SD or XD memory, etc.), flash memory, RAM, ROM, and the like, which are generally known.

The broadcast receiving module 175 receives a broadcast signal transmitted through a satellite or terrestrial wave, converts the broadcast signal into a broadcast data form that can be output to the sound output units 114 and 128 and the display unit 113, and outputs it to the controller 170. In addition, the broadcast receiving module 165 receives additional data related to the broadcast (for example, an EPG (electric program guide), a channel list, etc.). The broadcast data and additional data converted by the broadcast receiving module 175 may be stored in the memory 164.

The power supply unit 129 receives an external power source and an internal power source under the control of the controller 170 to supply power for operation of each component.

The portable terminal is not limited to the configuration and method of the embodiments described above, but the embodiments may be configured by selectively combining all or some of the embodiments so that various modifications can be made.

1 is a front perspective view of a mobile terminal according to an embodiment of the present invention;

2 is a rear perspective view of a mobile terminal according to an embodiment of the present invention;

3 is a perspective view of a mobile terminal showing a state in which a battery cover is removed;

4 is a cross-sectional view of the mobile terminal along the IV-IV line of FIG.

5 is a conceptual diagram illustrating a control method of a display according to an embodiment of the present invention.

6 is a flowchart illustrating a method of controlling brightness of a display unit according to the present invention.

7 is a conceptual diagram illustrating a control method of a display unit according to another exemplary embodiment of the present invention.

8 and 9 are perspective views showing a portable terminal according to another embodiment of the present invention.

10 is a block diagram of a portable terminal according to an embodiment of the present invention.

Claims (13)

A terminal body having different first and second surfaces and having a battery; First and second solar cells mounted on the first and second surfaces, respectively, and converting light energy into electrical energy; A charging unit for charging the battery, wherein the first and second lines respectively connected to the first and second solar cells are collected at an assembly position and connected to a single line; And And a controller configured to equally match current amounts of the first and second lines supplied to the assembly position under specific conditions when the current amounts generated in the first and second solar cells are different from each other. The method of claim 1, And a current monitor for measuring first and second amounts of current generated by the first and second solar cells, respectively. The method of claim 2, And the control unit matches the amount of current supplied to the assembly position to a smaller value of the first and second current amounts. The method of claim 2, The specific condition is a portable terminal, characterized in that the larger of the first and second current amount is smaller than the value of twice the small current amount. The method of claim 1, And first and second switching units mounted on the first and second lines, respectively, to open and close the first and second lines, respectively. The method of claim 5, And the controller turns off any one of the first and second switching units when the amount of current does not satisfy the specific condition. The method of claim 5, And the control unit turns off any one of the first and second switching units when one of the first and second solar cells does not generate electrical energy. The method of claim 5, And the first and second switching units are configured to prevent current from flowing back toward the first and second solar cells at an assembly position. The method of claim 1, And first and second illuminance sensors mounted on the first and second surfaces, respectively, to sense brightness of light. 10. The method of claim 9, The control unit detects the amount of current generated in the first and second solar cells based on the sensing values of the first and second illuminance sensors. The method of claim 1, The battery includes a plurality of battery cells connected in parallel to the charging unit, And a matching unit for impedance matching of the battery cells is connected to the battery cells. The method of claim 12, The matching unit is a portable terminal, characterized in that for adjusting the amount of current supplied to the battery cells through a pulse width modulation scheme. The method of claim 1, The terminal body includes a first body and a second body connected to each other so as to be relatively movable, The first and second surfaces are provided in the first and second bodies, respectively.

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