JP4068039B2 - Mobile communication terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charge control method and mobile communication terminal device wherein whether a storage battery is being charged or fully charged can be indicated on an output unit without largely reducing the power stored in the battery. <P>SOLUTION: A front output portion is positioned in the front face of the upper enclosure or the lower enclosure of folding device and consumes much power. When the storage battery of the device is fully charged (Step 11e: "Fully charged"). That is not indicated on the front output portion (Step 11q) if the following conditions are met: the power supply to the equipment is off (Step 11n: "Off") and the upper and lower enclosures are in open state (Step 11p: "Open"). Thus, the power consumed to indicate that the battery is fully charged can be reduced. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

The present invention relates to a mobile communication terminal device , and more particularly to an output of a charging state of a storage battery.

  Many portable devices such as mobile communication terminal devices incorporate a storage battery, that is, a rechargeable battery, and operate with electric power supplied from the battery. Therefore, it is necessary to appropriately charge the battery, and in many cases, a charger that converts commercial AC power into predetermined DC power is provided as a part of the portable device. The battery is charged by connecting the charger to the portable device via the connector.

  Here, in order to fully charge the battery in a short time, that is, to complete the charging, the portable device is turned off and charged. Note that the power-off means that the portable device is in a state where the intended operation of the device cannot be performed, and some functions of the device operate for controlling the portable device. Have

  For example, the charging control unit is operating even when the power is turned off, and charging is terminated when the battery is fully charged. Then, the charging control unit outputs whether the battery is being charged or fully charged. Therefore, when the charger is connected to a portable device, either an image indicating that the battery is being charged or an image indicating that the battery is fully charged is displayed on the output device of the portable device. Output is done.

  However, in the above-described method, power necessary for outputting an image indicating that the battery is fully charged to the output device when the battery is fully charged is supplied from the battery. Therefore, there is a problem that the power charged in the battery is reduced by the power consumed by the output device.

  Because, in order to prevent overcharging of the battery and overheating of the charger, the charging control unit of the portable device disconnects the electrical connection between the charger and the battery when the battery is fully charged. It is.

The present invention has been made to solve the above-described problems, and outputs whether the battery is being charged or fully charged to the output device without greatly reducing the power charged in the battery. It is an object of the present invention to provide a mobile communication terminal device that can be used.

In order to achieve the above object, a mobile communication terminal device of the present invention is a foldable mobile communication terminal device comprising a first housing and a second housing, and a storage battery and power on / off. An input means for inputting the instruction, an inner display means that is disposed at an inner position when folded by the first casing and the second casing, and displays by consuming the first electric power, Outer display means that is disposed on the outer side when folded by one housing and the second housing and that consumes and displays a second power less than the first power, and power for charging the storage battery A charger that supplies power for charging the storage battery by displaying on the inner display means or the outer display means that the storage battery is being charged. Connected and fully charged, and before When the first casing and the second casing detect an open state when the power is turned off, the storage battery is charged without causing the inner display means to display that the storage battery is fully charged. When the battery is fully charged and connected to a charger that supplies power, and the power supply is cut off, the storage battery detects that the first housing and the second housing are folded. Charging control means for displaying on the outer display means that the battery is fully charged;
It is characterized by having .

  According to the present invention, when the storage battery is fully charged, the output is not output to the output device that consumes a large amount of power, so that the storage battery is being charged or the battery is fully charged without greatly reducing the power charged in the storage battery. Can be output to the output device.

Hereinafter, an embodiment of a mobile communication terminal device according to the present invention will be described with reference to the drawings. FIG. 1 is an embodiment of a foldable mobile communication terminal apparatus according to an embodiment of the present invention, and is a diagram showing an external appearance when the upper and lower casings are opened. 1A is a rear view, FIG. 1B is a side view, and FIG. 1C is a front view.

  In this mobile communication terminal device, an upper housing 1 and a lower housing 2 are rotatably connected by a hinge portion 3, and further, the upper housing 1, the lower housing 2 or the hinge portion 3 and a connector ( And a charger (not shown) that is detachably connected via a charger (not shown).

  The inner surface of the upper housing 1 is provided with a speaker 4 used for receiving calls and a backlight used for displaying prompting the user for operation, displaying contents instructed by the user, and displaying the operating state of the apparatus. And a front output unit 5a made of a transmissive LCD (Liquid Crystal Display). Further, on the outer surface of the upper housing 1, a back output unit 5b composed of a reflective LCD provided with a backlight used for displaying the operation state of the apparatus is installed.

  Here, the transmissive LCD is an LCD having a low light reflectance of the liquid crystal panel, and the user cannot visually recognize the display when the backlight is turned off. When the backlight is turned on with high brightness, the user can visually recognize a display with high brightness and high contrast. Further, when the backlight is turned on with low luminance, the user can visually recognize the low luminance display.

  On the other hand, the reflective LCD is an LCD having a high light reflectance of the liquid crystal panel, and when the backlight is turned off, the user can visually recognize a low-brightness display due to the reflection of sunlight or room light. When the backlight is turned on, the user can visually recognize a high-luminance display.

  Note that the speaker 4 and the microphone 7 used for calling and the input unit 6 used for inputting a telephone number are all installed on the inner surface, and mobile communication such as calling, mail transmission, and web browsing is provided. The main function of the terminal device operates when the upper and lower casings 1 and 2 are in the open state. Therefore, the front output unit 5a is a device that can output more information and consumes more power than the back output unit 5b.

  Further, on the inner surface of the lower housing 2, an input unit 6 composed of a keypad used for inputting operation instructions such as turning on and off the power of the mobile communication terminal device and inputting alphanumeric characters, characters and symbols, A microphone 7 used for transmission is installed. An antenna 8 used for transmission / reception of radio waves is installed on the outer surface of the lower housing 2.

  Further, the hinge unit 3 is provided with an open / close detection unit (not shown) for detecting whether the upper and lower casings 1 and 2 are in an open state or a closed state, and the open / close detection unit is opened and closed from the open / close detection unit. A signal is being output.

  FIG. 2 is a block diagram showing a configuration of this mobile communication terminal apparatus. This mobile communication terminal device is inputted with an open / close signal 3a, a control unit 11 for controlling the entire device, an antenna 8 for transmitting / receiving radio waves to / from a base station (not shown), a communication unit 12, Transmission / reception unit 13, speaker 4, microphone 7, call unit 14, front output unit 5a, back output unit 5b, input unit 6, power supply unit 21 for supplying power to these units, and commercial AC power supply And a charger 31 that receives power supplied from (not shown).

  FIG. 3 is a block diagram showing a configuration of the power supply unit 21. The power supply unit 21 includes a charger connection detection unit 21a that is detachably connected to the charger 31 via the control unit 11 and the connector, and a switch 21b that is connected to the charger 31 via the control unit 11 and the connector. , A switch 21b, a voltage measurement unit 21d, and a battery 21c connected to each part of the mobile communication terminal device, and a voltage measurement unit 21d connected to the battery 21c and the control unit 11.

  Here, electric power is supplied from the charger 31 to the switch 21b, from the switch 21b to the battery 21c, and from the battery 21c to each part of the mobile communication terminal device. The flow of power supply is indicated by a thick line in FIG.

  The operation of each part of the mobile communication terminal apparatus configured as described above according to the embodiment of the present invention will be described with reference to FIG.

  First, the communication unit 12 outputs the high frequency signal received by the antenna 8 to the transmission / reception unit 13, and transmits the high frequency signal output from the transmission / reception unit 13 from the antenna 8.

  The transmission / reception unit 13 amplifies, converts and demodulates the high-frequency signal from the communication unit 12, and sends the digital audio signal obtained thereby to the call unit 14 and the control signal to the control unit 11. Further, the digital audio signal output from the call unit 14 and the control signal output from the control unit 11 are modulated, frequency-converted, and amplified to obtain a high-frequency signal, which is sent to the communication unit 12.

  Next, the call unit 14 converts the digital audio signal output from the transmission / reception unit 13 into an analog audio signal, amplifies it, and sends it to the speaker 4. The analog audio signal output from the microphone 7 is amplified, converted into a digital audio signal, and transmitted to the transmission / reception unit 13.

  Next, the operation of the front output unit 5a will be described. The front output unit 5a starts a display operation with high luminance or low luminance when activated by the control unit 11 when the upper and lower casings 1 and 2 are open. Until the new screen is activated by the control unit 11, the same content is displayed on the front output unit 5a.

  When displayed on the front output unit 5a, a battery level mark is displayed at a predetermined position of the front output unit 5a, for example, at the upper left. The battery level mark is an image showing the state of the electric power stored in the battery 21c, and one battery level mark to be displayed is selected from the plurality of battery level marks by the control unit 11, and is displayed in the control unit 11. (The details will be described later.)

  FIG. 4 shows an example of the battery level mark displayed on the front output unit 5a. The battery level mark 5c is an image in which many objects are contained in the battery, and indicates that there is a lot of electric power stored in the battery 21c. The battery level mark 5d is an image in which there are few objects in the battery, and indicates that the power stored in the battery 21c is small. The battery level mark 5e is an image obtained by combining a battery and an arrow, and indicates that the battery 21c is being charged.

  Note that the display is not limited to displaying the amount of power stored in the battery 21c in two stages. You may divide and display in arbitrary steps of three or more steps. In addition, the battery level marks 5c to 5e are images, and intuitively represent the state of power stored in the battery 21c, but are not limited thereto. For example, it may be a “numeric string” indicating the voltage of the power stored in the battery 21c, or may be “high” or “low” depending on the level of the voltage. Further, when the battery 21c is being charged, the characters “charging” may be used.

  Next, the operation of the back output unit 5b will be described. When the upper and lower casings 1 and 2 are in a closed state, the rear output unit 5b is activated by the control unit 11 to start a display operation with high luminance or low luminance. The same content is displayed until a new screen is activated by the control unit 11.

  When the display is performed on the rear output unit 5b, a battery level mark is displayed at a predetermined position on the rear output unit 5b. The battery level mark displayed is the same as the battery level marks 5c to 5e displayed on the front output unit 5a.

  The input unit 6 includes a plurality of keys including keys for instructing power on / off of the mobile communication terminal device and numeric keys “1” to “9” and “0” for designating the telephone number of the communication partner. The operation starts when the control unit 11 is activated, and an identifier for identifying the key is notified to the control unit 11 according to the key input input by the user, and the operation ends.

  Next, the operation of the power supply unit 21 will be described with reference to FIGS. The charger connection detection unit 21a measures the voltage of power supplied from the charger 31 via the connector. Then, the charger 31 supplies direct-current power that can charge the battery 21 c and detects whether or not it is connected to the power supply unit 21.

  That is, the charger connection detection unit 21a starts to operate in response to the activation signal from the control unit 11, and detects that the charger 31 is connected if the measured voltage is a value equal to or greater than a predetermined chargeable voltage threshold. If the voltage is less than the threshold, it is detected that the charger 31 is not connected. And it notifies the control part 11 whether the charger 31 is connected.

  The switch 21b starts to operate in response to an activation signal from the control unit 11, and electrically disconnects or turns on between a terminal (not shown) of power supplied from the charger 31 via a connector and the battery 21c. To do. The battery 21c is a storage battery, and charges the power supplied from the charger 31 when the charger 31 is connected and the switch 21b is turned on. The battery 21c supplies power to each part of the mobile communication terminal device.

  The voltage measurement unit 21d starts operation in response to an activation signal from the control unit 11, and measures the voltage of power supplied from the battery 21c. Then, the control unit 11 is notified of the measured voltage.

  Next, the operation of the charger 31 will be described. The charger 31 converts the supplied commercial AC power into DC power having a predetermined voltage for charging the battery 21c. However, the power supplied to the charger 31 is not limited to commercial AC power, and may be, for example, dry battery power.

  Next, the control operation of the charging process of the control unit 11 will be described. FIG. 5 is a flowchart showing the control operation of the charging process by the control unit 11.

  The control operation of the charging process of the control unit 11 starts at a predetermined time interval (step 11a). Here, when the user operates a predetermined key of the input unit 6, the control operation of the control unit 11 is performed regardless of whether the mobile communication terminal device is turned off or turned on. Start with a time interval of.

  Subsequently, the control unit 11 activates the charger connection detection unit 21a, and checks whether or not the charger 31 is connected to the power supply unit 21 while supplying power that can charge the battery 21c (step 11b). ).

  If the notification that the charger 31 is not connected to the power supply unit 21 is received from the charger connection detection unit 21a ("not connected" in step 11b), the control unit 11 stores the battery level mark in the battery 21c. The battery level mark 5c indicating that the electric power is high or the battery level mark 5d indicating that the electric power stored in the battery 21c is low is selected and stored in the control unit 11 (step 11c).

  That is, the control unit 11 activates the voltage measurement unit 21d, receives a value obtained by measuring the voltage of the power supplied from the battery 21c from the voltage measurement unit 21d, and if the value is equal to or greater than a predetermined voltage level threshold, the battery If the level mark 5c is selected and its value is less than the threshold value, the battery level mark 5d is selected. Subsequently, the charge control operation is terminated (step 11d).

  When the charger 31 is not connected to the power supply unit 21 by the above-described operation, the control operation of the charging process of the control unit 11 includes the presence / absence of display of the front output unit 5a, the backlight included in the front output unit 5a is turned off, It does not affect whether low-intensity lighting or high-intensity lighting is used.

  In addition, it does not affect whether or not the back output unit 5b is displayed and whether the backlight included in the back output unit 5b is off or on. Therefore, there is no increase in consumption of the electric power stored in the battery 21c.

  The description returns to the control operation of the charging process of the control unit 11 shown in the flowchart of FIG. If the notification that the charger 31 is connected to the power supply unit 21 is received from the charger connection detection unit 21a ("connection" in step 11b), the control unit 11 subsequently has the battery 21c fully charged. Whether or not (step 11e).

  That is, the control unit 11 activates the voltage measurement unit 21d and receives the voltage of the power supplied from the battery 21c measured by the voltage measurement unit 21d. If the voltage is equal to or higher than a predetermined full charge voltage threshold, it is determined that the battery 21c is fully charged. If the voltage is less than the threshold, it is determined that the battery 21c is not fully charged.

  Alternatively, the control unit 11 determines that the battery 21c is fully charged when a predetermined time elapses after the voltage becomes equal to or higher than a predetermined second full charge voltage threshold, and if not, the battery 21c is It may be determined that the battery is not fully charged.

  When it is determined that the battery 21c is not fully charged (“No” in Step 11e), the control unit 11 turns on the switch 21b (Step 11f). And the battery level mark 5e which shows that the battery 21c is charging is selected as a battery level mark, and it stores in the control part 11 (step 11g).

  Subsequently, the control unit 11 checks whether the power of the mobile communication terminal device is turned on or off depending on the state of the mobile communication terminal device stored in the control unit 11 (step 11h). When the power is turned on (“turn on” in step 11h), the control unit 11 ends the control operation (step 11d).

  Here, the power-on is a state in which the main function of the mobile communication terminal device, for example, the setting for operating the call function is performed by operating the keys of the input unit 6. On the other hand, the power-off is a state in which the main function of the mobile communication terminal device is stopped by a key operation of the input unit 6, and some control functions including the charging control of the control unit 11 are It is operating.

  When disconnected (“disconnected” in step 11h), the control unit 11 checks the open / closed state of the upper and lower casings 1 and 2 by receiving the open / close signal 3a (step 11i). If it is in the state ("open" in step 11i), the front output unit 5a is displayed, and the backlight provided in the front output unit 5a is turned on with low luminance (step 11j). Subsequently, the control unit 11 ends the control operation (step 11d).

  On the other hand, when the upper and lower casings 1 and 2 are in a closed state (“closed” in step 11i), the rear output unit 5b is displayed, and the backlight included in the rear output unit 5b is turned off (step 11k). Subsequently, the control unit 11 ends the control operation (step 11d).

  When the battery 21c is being charged by the above-described operation and the mobile communication terminal device is powered off, the control unit 11 depends on the open / closed state of the upper and lower casings 1 and 2, and the front output unit 5a. Alternatively, the battery level mark 5e indicating that the battery 21c is being charged is displayed at a low luminance on the output part of the back output part 5b that is easily visible to the user.

  Thereby, the user can easily know that the battery 21c is being charged, and the consumption of the electric power stored in the battery 21c is small. Note that what is displayed on the front output unit 5a or the back output unit 5b is not limited to the battery level mark 5e. Characters other than the battery level mark 5e and images may be displayed. The display may be blinked. Furthermore, you may blink the backlight with which the front output part 5a is provided.

  In addition, when the battery 21c is being charged and the mobile communication terminal device is powered on, the front output unit 5a is displayed, the backlight provided in the front output unit 5a is turned off, low-intensity lighting, or high The upper and lower casings 1 and 2 are in an open state depending on whether the brightness is on, whether the back output unit 5b is displayed, and whether the backlight included in the back output unit 5b is off or on. Or whether it is in a closed state.

  Further, the power consumption stored in the battery 21c is reduced by setting the energy saving mode, that is, the user does not operate the input unit 6 for a predetermined time, for example, the front output unit 5a and the rear output unit 5b. If the setting for turning off the backlight of the front output unit 5a and the back output unit 5b is performed, there is a key operation on the input unit 6 by the user for a predetermined time. The presence or absence of the display differs depending on whether the backlight is on or off.

  In any case, when the battery 21c is being charged and the power of the mobile communication terminal device is turned on, the control operation of the control process of the control unit 11 is the state of the front output unit 5a and the rear output unit 5b. The battery 21c is being charged by selecting the battery level mark 5e without affecting the state. As a result, the user can continue to use the mobile communication terminal device without any trouble or confusion. Moreover, there is no increase in the consumption of the electric power stored in the battery 21c.

  If the battery 21c is being charged and the mobile communication terminal device is powered on, the upper and lower housings 1 and 2 are open and the front output unit 5a is not displaying. The control unit 11 may display or blink the front output unit 5a. Further, if the backlight included in the front output unit 5a is turned off, the backlight may be turned on or blinked with low luminance.

  On the other hand, when the battery 21c is being charged and the power of the mobile communication terminal device is turned on, the upper and lower casings 1 and 2 are in a closed state and the rear output unit 5b is not displaying. The control unit 11 may display or blink the rear output unit 5b.

  Further, the control unit 11 may display or blink the front output unit 5a or the back output unit 5b, and turn on or blink the backlight included in these output units only for a predetermined time after the start of charging. The display or blinking display, and further, the lighting or blinking of the backlight can strongly indicate to the user that the battery 21c is being charged. The consumption of the stored power is small.

  The description returns to the control operation of the charging process of the control unit 11 shown in the flowchart of FIG. When it is determined that the battery 21c is fully charged (“full charge” in step 11e), the control unit 11 disconnects the switch 21b (step 11m).

  Subsequently, the control unit 11 checks whether the power of the mobile communication terminal device is turned on or off (step 11n). The operation at step 11n is the same as the operation at step 11h. When the battery level mark is turned on ("turned on" in step 11n), the control unit 11 selects the battery level mark 5c or the battery level mark 5d as the battery level mark, and stores it in the control unit 11 (step 11o). ), The control operation is terminated (step 11d). The operation at step 11o is the same as the operation at step 11c.

  However, the full charge voltage threshold value and the second full charge voltage threshold value used when determining whether or not the battery 21c is fully charged in step 11e determine the amount of power stored in the battery 21c in step 11o. Greater than the voltage level threshold used in Therefore, in step 11o, the battery level mark 5c is selected.

  If it has been cut (“cut” in step 11n), the control unit 11 subsequently checks the open / close state of the upper and lower casings 1 and 2 by receiving the open / close signal 3a (step 11p). The operation at step 11p is the same as the operation at step 11i.

  When the upper and lower casings 1 and 2 are in the open state (“open” in step 11p), the control unit 11 does not display the front output unit 5a, and further turns off the backlight included in the front output unit 5a ( Step 11q). Subsequently, the control unit 11 ends the control operation (step 11d).

  When the upper and lower casings 1 and 2 are in a closed state (“closed” in step 11p), the control unit 11 selects the battery level mark 5c or the battery level mark 5d as the battery level mark, and the control unit 11 (Step 11r). The operation in step 11r is the same as the operation in step 11c. In step 11r, the selection of the battery level mark 5c is the same as that described in the explanation of the operation in step 11o.

  Subsequently, the control unit 11 displays the battery level mark 5c selected in step 11r on the rear output unit 5b, turns off the backlight included in the rear output unit 5b (step 11s), and ends the operation (step). 11d). The display may be a blinking display.

  When the battery 21c is fully charged and the power supply of the mobile communication terminal device is cut off by the above-described operation, the control unit 11 controls the rear output unit 5b if the upper and lower casings 1 and 2 are closed. The battery level mark 5c is displayed with low luminance. Thereby, the user can easily know that the battery 21c is fully charged.

  Further, when the battery 21c is fully charged and the mobile communication terminal device is powered off, the control unit 11 does not cause the rear output unit 5b to display if the upper and lower casings 1 and 2 are open. In addition, since the front output unit 5a whose power consumption is larger than the rear output unit 5b is not displayed, the power consumption stored in the battery 21c is small. As a result, after the battery 21c is fully charged, the power stored in the battery 21c is not greatly reduced when the battery 21c is fully charged.

  When the battery 21c is fully charged and the mobile communication terminal device is turned on, the control is performed in the same manner as when the battery 21c is being charged and the mobile communication terminal device is turned on. The control operation of the charging process of the unit 11 does not affect the state of the front output unit 5a and the state of the back output unit 5b. As a result, the user can continue to use the mobile communication terminal device without any trouble or confusion. Moreover, there is no increase in the consumption of the electric power stored in the battery 21c.

  In the present embodiment, the charger 31 is detachably connected to the upper housing 1, the lower housing 2, or the hinge portion 3, but is not limited thereto. The charger 31 may be formed integrally with the upper casing 1, the lower casing 2 or the hinge portion 3.

  The front output unit 5a is a transmissive LCD, but is not limited to this, and may be a reflective LCD. Further, although the back output unit 5b is a reflective LCD, it is not limited to this, and may be a transmissive LCD.

  Furthermore, although the battery 21c is prevented from being overcharged by the disconnecting operation of the switch 21b constituting the power supply unit 21 and the charger 31 is prevented from being overheated, the present invention is not limited to this. For example, when the charger 31 measures the voltage of power supplied from the battery 21c and detects that the battery 21c is fully charged by the voltage, the charger 31 stops supplying power to the power source unit 21. Also good.

  In the above description, the present invention is applied to a mobile communication terminal as an example. However, the present invention can naturally be applied to a PDA (Personal Digital Assistant), a personal computer, and the like. The present invention is not limited to the above configuration, and various modifications are possible.

1 is an external view of a mobile communication terminal device according to an embodiment of the present invention. The block diagram which shows the structure of the mobile communication terminal device which concerns on embodiment of this invention. The block diagram which shows the structure of the power supply part which concerns on embodiment of this invention. An example of a screen displaying a battery level mark. The flowchart of the control operation | movement of the charging process of the control part which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper housing | casing 2 Lower housing | casing 3 Hinge part 3a Open / close signal 5a Front output part 5b Rear output part 11 Control part 21 Power supply part 21a Charger connection detection part 21b Switch 21c Battery 21d Voltage measurement part 31 Charger

Claims (6)

A foldable mobile communication terminal device comprising a first housing and a second housing,
  A storage battery,
  Input means for inputting power-on and power-off instructions;
  An inner display means that is disposed at an inner position when folded by the first casing and the second casing, and that consumes and displays the first electric power;
  An outer display means that is disposed at a position that is outside when folded by the first casing and the second casing, and that consumes and displays a second power less than the first power;
  When connected to a charger that supplies power for charging the storage battery and charging, the internal display means or the external display means displays that the storage battery is charging,
When the first casing and the second casing detect an open state when connected to a charger that supplies power for charging the storage battery and the battery is fully charged and the power source is cut off, Without displaying that the storage battery is fully charged on the inner display means,
A state in which the first housing and the second housing are folded is detected when the battery is fully charged and connected to a charger that supplies power for charging the storage battery, and the power supply is disconnected. Then, charging control means for displaying on the outer display means that the storage battery is fully charged;
A mobile communication terminal apparatus comprising: The charge control means includes
When the first casing and the second casing detect an open state when connected to a charger that supplies power for charging the storage battery and the battery is fully charged and the power is turned on, Display on the inner display means that the storage battery is fully charged,
Detects a state in which the first casing and the second casing are folded when the battery is fully charged and connected to a charger that supplies power for charging the storage battery, and the power is turned on. Then, the outside display means displays that the storage battery is fully charged.
The mobile communication terminal apparatus according to claim 1. The inner display means consumes the first power and displays at a first luminance, or consumes a third power less than the first power and lowers the third luminance. An LCD device that displays brightness,
  The charging control means displays the third brightness when displaying on the inner display means.
The mobile communication terminal device according to claim 1, wherein the mobile communication terminal device is a mobile communication terminal device. The inner display means is a transmissive LCD device having a backlight, and displays the third brightness by consuming the third power by lowering the brightness of the backlight.
The mobile communication terminal apparatus according to claim 3. The outer display means consumes the second power and displays at the second luminance, or consumes a fourth power less than the second power and lowers the fourth luminance. An LCD device that displays brightness,
  The charging control unit displays the fourth brightness when displaying on the outer display unit.
The mobile communication terminal device according to claim 1, wherein the mobile communication terminal device is a mobile communication terminal device. The outer display means is a reflective LCD device having a backlight, and by turning off the backlight, the fourth power is consumed to display at the fourth luminance.
The mobile communication terminal apparatus according to claim 5.

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