JP2008287162A - Portable apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve low power consumption without spoiling a feeling of usage of a portable apparatus. <P>SOLUTION: When an emergency mode is set, display of a sub LCD panel 12 to be a transmission type LCD panel is prohibited, a backlight 13 is turned off, voltage is not applied to a luminance control film 14 and light transmittance is increased and made transparent, and in this state, external light made incident from the sub LCD panel 12 is radiated to the rear surface of a main LCD panel 11 via the transparent luminance control film 14 and display of the main LCD panel 11 can be confirmed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable device, and more particularly to a portable device that reduces power consumption without impairing the feeling of use.

  The battery of a mobile device such as a mobile phone may be exhausted when away from home. In such a case, replace with a spare battery prepared in advance, carry a dedicated charger, borrow power to charge, or purchase a disposable simple charger sold at the store etc. It is necessary to cope with this method. However, it is inconvenient to carry a spare battery or a dedicated charger, and the dedicated charger can only be charged where power can be used. Furthermore, in the event of a disaster, it is difficult to secure a power source or a simple charger, and it may not be possible to charge the battery of the mobile device, making it impossible to use the mobile device. It was.

As described above, in order to avoid the inability to use the portable device, in Patent Document 1, when the display means is clearly not used, the backlight is surely turned off to improve the power saving effect. It describes a mobile phone that can be used. Further, Patent Document 2 describes a mobile phone that can charge generated power by a solar cell panel provided along the upper part of a main body of a mobile device or along a side surface thereof. Patent Document 3 describes a mobile phone that generates power by pushing a push rod with a rod antenna inserted into the mobile phone.
JP 2003-298732 A JP 2006-229741 A JP-A-8-307300

  However, since the mobile phone described in Patent Document 1 does not prohibit lighting of the backlight, the backlight is turned on when it is determined that the display means is used, and in an emergency such as a disaster. Even if you want to prioritize power saving, power will be consumed. If the backlight is turned off, it becomes difficult to read the display.

  Moreover, since the mobile phone described in Patent Document 2 has a solar cell panel disposed on the surface of the main body, there is a disadvantage that there are no color variations and there are large design restrictions. Further, the mobile phone described in Patent Document 3 has a drawback that it is necessary to secure a space for the push rod to expand and contract. The present invention has been made in view of such circumstances, reducing power consumption without impairing the feeling of use, charging a battery by self-power generation without requiring a large space without being restricted by design. An object of the present invention is to provide a portable device that can be used continuously for a long time.

  In order to achieve the above object, a portable device according to claim 1 is a transmissive display panel disposed on a front surface of a housing, and a display panel disposed on a back surface of the housing, at least a part of the A display panel arranged so as to overlap with the transmission type display panel in a plane, and a light control means arranged between the transmission type display panel and the display panel and capable of electrically adjusting the light transmittance; Transmittance switching means for changing the light transmittance of the light control means, a backlight for irradiating the transmissive display panel with light from between the transmissive display panel and the light control means, and lighting of the backlight And a backlight control means for switching the light off, and the light of the backlight is diffused by turning on the backlight and lowering the light transmittance of the light control means to emit light to the transmissive display panel Let It is characterized in that to irradiate the external light incident through the display panel by increasing the light transmittance of the light control means turns off the backlight on a rear surface of the transmissive display panel.

  Thereby, power consumption can be reduced without impairing the feeling of use.

  According to a second aspect of the present invention, in the portable device according to the first aspect, the mode switching means for switching between the normal mode and the power saving mode, the backlight is turned on when the normal mode is set, and the dimming means By reducing the light transmittance, the light of the backlight is diffused and emitted to the transmissive display panel, and when the power saving mode is set, the backlight is turned off and the light of the light control means And control means for irradiating the back surface of the transmissive display panel with external light incident through the display panel by increasing the transmittance of the display panel.

  According to a third aspect of the present invention, in the portable device according to the second aspect, the mode switching unit manually switches between the normal mode and the power saving mode.

  Thereby, it is possible to easily reduce the power consumption without impairing the feeling of use.

  According to a fourth aspect of the present invention, in the portable device according to the second or third aspect, the portable device includes a power supply unit including a battery and a remaining capacity detecting unit that detects a remaining capacity of the battery, and the mode switching unit When the capacity detection means detects a decrease in the remaining capacity of the battery, the power detection mode is switched to.

  As a result, power consumption can be reduced when appropriate.

  According to a fifth aspect of the present invention, in the portable device according to any one of the first to fourth aspects, the light control means decreases the light transmittance by supplying power.

  Thereby, the power consumption can be further reduced.

  6. The portable device according to claim 1, wherein the light control means includes any one of a light control film, electronic paper, a transparent EL, and a transparent conductive film. It is characterized by that.

  Thereby, the transmittance can be easily switched.

  The portable device according to any one of claims 1 to 6, wherein a solar cell that transmits light and is disposed between a power supply unit including a battery, the transmissive display panel, and the display panel. And a light charging means for charging the battery with an electromotive force generated by irradiating the solar cell with external light.

  Thereby, it can charge only by irradiating light, without receiving restrictions on a design.

  As shown in claim 8, in the portable device according to any one of claims 1 to 7, the portable device is a mobile phone, a power supply unit including a battery, a vibrator motor for notifying an incoming call, A first gear provided on a shaft of a vibrator motor, a second gear meshable with the first gear, a rotation operation means for rotating the second gear, and the rotation operation means. Rotating charging means for charging the battery with electromotive force generated by rotating and rotating a vibrator motor.

  Thereby, it is possible to charge in a dark place without requiring a space.

  According to a ninth aspect of the present invention, in the portable device according to the eighth aspect, the rotation operation means is a rod antenna that is rotatable about an antenna axis and at least a part of which is exposed from the housing. To do.

  Thereby, a charging mechanism can be realized without adding an operation member dedicated to charging.

  According to the present invention, the power consumption is reduced without impairing the feeling of use, the battery can be charged by self-power generation without the need for a large space without being restricted by design, and the battery can be charged for a long time. A portable device that can be used continuously can be provided.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

<First Embodiment>
FIG. 1A is a perspective view seen from the front of the mobile phone 1 according to the first embodiment of the present invention. FIG. 1C is a perspective view seen from the back of the mobile phone 1. The mobile phone 1 includes a main LCD panel 11, a sub LCD panel 12, an antenna 16, a microphone 17, a speaker 18, and an operation unit 19 in addition to a foldable housing 10.

  FIG. 1B is a schematic view of a cross section of the housing 10. Between the main LCD panel 11 and the sub LCD panel 12, the backlight 13 and the light control film 14 which consist of the main backlight 13-1 and the sub backlight 13-2 are provided.

  FIG. 2 is a block diagram showing an example of the internal configuration of the mobile phone 1. In addition to the above-described elements, the control unit 21 including the call control unit 22, the LCD control unit 23, the backlight control unit 24, the light control film control unit 25, and the mode control unit 29, the transmission / reception unit 31, and the storage unit 32 , An LCD drive unit 33, a backlight drive unit 34, and a light control film drive unit 35.

  The antenna 16 is a rod antenna, and the antenna 16 and the transmission / reception unit 31 perform data communication such as voice communication and electronic mail between the mobile phone 1 and the base station according to the control of the call control unit 22.

  The operation unit 19 includes cursor keys for inputting a telephone number, an e-mail destination and text, selecting various menus, and inputting settings. Further, by operating the operation unit 19, it is possible to switch whether the mobile phone 1 is used in a normal mode, which will be described later, or used in an emergency mode.

  The mode control unit 29 controls whether the mobile phone 1 is operated in the normal mode or the emergency mode according to the operation of the operation unit 19.

  The main LCD panel 11 and the sub LCD panel 12 are transmissive liquid crystal panels and are arranged so as to overlap in a plane. The LCD control unit 23 causes the main LCD panel 11 and the sub LCD panel 12 to display via the LCD driving unit 33 based on the input of the operation unit 19.

  The backlight 13 is composed of LEDs, and the backlight control unit 24 is a backlight of the main LCD 13-1 that is the backlight of the main LCD panel 11 and the backlight of the sub LCD panel 12 via the backlight driving unit 34. A certain backlight 13-2 is driven, and transmitted light is irradiated from the back of each LCD panel so that the display of the main LCD panel 11 and the sub LCD panel 12 can be recognized.

  The light control film 14 is composed of a transparent film, a transparent electrode, and a polymer / liquid crystal composite film whose light transmittance is controlled according to the applied voltage. The light control film control unit 25 changes the transmittance of the light control film 14 via the light control film driving unit 35. The light control film 14 has a fine uneven surface at the layer interface. When a voltage is applied to the light control film 14 by the light control film driving unit 35, the light control film 14 has a reduced transmittance and becomes white, and the light control film 14 acts as a diffusion plate due to the unevenness of the white color and the layer interface.

  The storage unit 32 stores a program for realizing the functions of the mobile phone 1.

  Next, the normal mode and the emergency mode of the mobile phone 1 will be described. The emergency mode is a mode in which battery consumption is suppressed as much as possible to extend the life of the battery. As described above, the mobile phone 1 can be set to the emergency mode by operating the operation unit 19.

  FIG. 3 is a flowchart showing an operation of determining the mode and controlling the backlight 13 and the light control film 14. First, in the incoming call waiting state, the display of the main LCD panel 11 and the sub LCD panel 12 is turned off, and the backlight 13 and the light control film 14 are turned off (step S31). Next, it is determined whether or not the operation of the mobile phone 1 has been performed (step S32). If it is determined that the operation unit 19 has been operated, the process proceeds to step S34. If it is determined that it has not been operated, it is next determined whether or not there is an incoming call (step S33). If it is determined that there is no incoming call, the process returns to step S32.

  If it is determined in step S32 that an operation has been performed, or if it is determined in step S33 that an incoming call has been received, it is next determined whether or not an emergency mode has been set (step S34). If it is determined that the emergency mode is not set, the LCD control unit 23 causes the main LCD panel 11 or the sub LCD panel 12 to display on the desired LCD panel via the LCD drive unit 33, and the backlight control unit 24. Turns on the backlight of the LCD panel that has displayed the main backlight 13-1 or sub-backlight 13-2 via the backlight driver 34, and the light control film control unit 25 controls the light control film driver A voltage is applied to the light control film 14 via 35. When the voltage is applied to the light control film 14, the light transmittance is lowered and becomes white (step S 36). When the light control film 14 becomes white, the light of the backlight 13 is diffused by the light control film 14, and the transmitted light is uniformly irradiated from the back of the main LCD panel 11 and the sub LCD panel 12.

  If it is determined that the emergency mode is set, the LCD control unit 23 causes the main LCD panel 11 to display via the LCD driving unit 33 and prohibits the display of the sub LCD panel 12. The backlight control unit 24 turns off the backlight 13, and the light control film control unit 25 does not apply a voltage to the light control film 14. For this reason, the light control film 14 increases the light transmittance and becomes transparent (step S35). As described above, since the sub LCD panel 12 is a transmissive liquid crystal panel, external light incident from the sub LCD panel 12 passes through the transparent light control film 14 as shown in FIG. Irradiate the back of the. As described above, when the emergency mode is set, the power supply to the backlight 13 and the light control film 14 is stopped even when the cellular phone 1 is used, and the main LCD panel 11 is the sub LCD panel. By incorporating external light through 12 as a light source, the display can be recognized.

  When the sub LCD panel 12 is smaller than the main LCD panel 11, only a part of the main LCD panel 11 is irradiated with external light. In this case, the display may be performed only on the overlapping portion of the main LCD panel 11 and the sub LCD panel 12.

  The light control film 14 does not function as a diffusion plate, and the backlight 13-1 and at least one between the main LCD panel 11 and the light control film 14 and between the sub LCD panel 12 and the light control film 14 are provided. A diffusion plate may be provided to scatter light from the backlight 13-2 and irradiate the LCD panel with light uniformly. Further, a light guide plate for guiding and diffusing light from the backlight 13 may be provided. In this case, the diffusion plate and the light guide plate need to transmit light.

  The main LCD panel 11 need not be an LCD panel, but may be anything that is transmissive and requires a backlight.

  The sub LCD panel 12 may not be an LCD panel, and may be anything as long as it transmits light in a non-display state. For example, electronic paper, transparent organic EL, transparent inorganic EL, or the like may be used. When these are used, a backlight is not necessary.

  Another material may be used instead of the light control film 14. For example, any electronic paper, transparent organic EL, transparent inorganic EL, transparent conductive film, etc. can be used as long as the light transmittance can be adjusted electrically.

  The mobile device according to the present invention may not be a mobile phone, and may be another device as long as the device has a display panel on the back side of the LCD panel. For example, a portable device such as a PDA may be used.

<Second Embodiment>
The mobile phone 1 according to the second embodiment of the present invention automatically switches to the emergency mode when the battery voltage decreases.

  FIG. 4 is a block diagram showing an example of the internal configuration of the mobile phone 1. In addition, the same code | symbol is attached | subjected to the part which is common in the block diagram of FIG. 2, and the detailed description is abbreviate | omitted. 2 is different from the block diagram shown in FIG. 2 in that a voltage detection unit 39 is provided. The voltage detector 39 detects the voltage of a battery (not shown) of the mobile phone 1.

  Next, the emergency mode of the mobile phone 1 will be described. FIG. 5 is a flowchart showing an operation of determining the mode and controlling the backlight 13 and the light control film 14. In addition, the same code | symbol is attached | subjected to the part which is common in the flowchart of FIG. 3, and the detailed description is abbreviate | omitted.

  As in the first embodiment, in the incoming call waiting state, the display of the main LCD panel 11 and the sub LCD panel 12 is turned off, and the backlight 13 and the light control film 14 are turned off (step S31). Next, it is determined whether or not the operation of the mobile phone 1 has been performed (step S32). If it is determined that the operation unit 19 has been operated, the process proceeds to step S51. If it is determined that it has not been operated, it is next determined whether or not there is an incoming call (step S33). If it is determined that there is no incoming call, the process returns to step S32.

  If it is determined in step S32 that it has been operated, or if it is determined in step S33 that there is an incoming call, it is determined whether or not the remaining battery capacity is sufficient (step S51). The battery remaining capacity is derived when the voltage detection unit 39 detects the battery voltage.

  When the voltage detection unit 39 determines that the battery voltage is sufficient, the mode control unit 29 sets the mobile phone 1 to the normal mode (step S52). When the normal mode is set, display is performed on a desired LCD panel of the main LCD panel 11 or the sub LCD panel 12, and the display of the LCD panel which is displayed of the main backlight 13-1 or the sub backlight 13-2 is displayed. When the backlight is turned on and voltage is applied to the light control film 14, the light transmittance is reduced to white (step S36). When the light control film 14 becomes white, the light of the backlight 13 is diffused by the light control film 14, and the transmitted light is uniformly irradiated from the back of the main LCD panel 11 and the sub LCD panel 12.

  When the voltage detection unit 39 determines that the battery voltage is insufficient, the mode control unit 29 sets the mobile phone 1 to the emergency mode (step S53). When the emergency mode is set, the display on the sub LCD panel 12 is prohibited, the backlight 13 is turned off, and the light control film 14 is not applied with a voltage and the light transmittance is increased and becomes transparent (step S35). . Therefore, the external light incident from the sub LCD panel 12 is irradiated to the back surface of the main LCD panel 11 through the transparent light control film 14, and the display on the main LCD panel 11 can be recognized.

  In the present embodiment, when the voltage detection unit 39 determines that the battery voltage is sufficient, the mode control unit 29 sets the normal mode, but the mode can be switched by the operation unit 19 as in the first embodiment. Alternatively, the mode selected by the operation unit 19 may be set when the voltage detection unit 39 determines that the battery voltage is sufficient.

  In the present embodiment, the remaining capacity of the battery is derived by performing voltage detection, but may be derived using other methods. For example, you may calculate from the usage time after completion of charge.

<Third Embodiment>
The mobile phone 1 according to the third embodiment can charge the battery by a solar cell provided inside the housing.

  FIG. 6A is a perspective view seen from the front of the mobile phone 1 according to the third embodiment of the present invention, and FIG. 6C is a perspective view seen from the back of the mobile phone 1. FIG. 6B is a schematic view of a cross section of the housing 10. The mobile phone 1 of the first embodiment shown in FIG. 1 is different from the mobile phone 1 in that a solar cell 15 is provided between the main LCD panel 11 and the sub LCD panel 12. In the solar cell 15, a transparent oxide semiconductor device that transmits visible light and generates photovoltaic power with light having a wavelength other than visible light is formed on a glass substrate. A thin film solar cell formed in a thin line shape may be arranged in a comb shape on the surface of the glass substrate, and a solar cell configured to transmit light through a portion where no thin film is formed may be used. The solar cell 15 is disposed so that the light receiving surface for generating power is on the light control film 14 side.

  FIG. 7 is a block diagram showing an example of the internal configuration of the mobile phone 1. In addition, the same code | symbol is attached | subjected to the part which is common in the block diagram of FIG. 2, and the detailed description is abbreviate | omitted. The block diagram shown in FIG. 2 is different from the block diagram shown in FIG. The charging unit 40 charges an unillustrated battery with the electromotive force generated in the solar cell 15. Further, when the battery is fully charged, the battery has a function of prohibiting charging from the solar battery 15 to prevent overcharging of the battery.

  Next, the charging operation by the solar battery 15 will be described. Similar to the first embodiment, the cellular phone 1 can switch between the normal mode and the emergency mode by operating the operation unit 19.

  In the incoming call waiting state, the display of the main LCD panel 11 and the sub LCD panel 12 is turned off, and the backlight 13 and the light control film 14 are turned off. As shown in FIG. 6, in this state, the external light incident from the non-display sub LCD panel 12 passes through the light control film 14 in a state where the transmittance is increased by turning off the voltage application, and the solar cell 15. The light receiving surface is irradiated. An electromotive force is generated in the solar cell 15 by the external light, and the charging unit 40 charges the battery (not shown) with the electromotive force.

  In the emergency mode, only the display on the main LCD panel 11 from the incoming call waiting state is different. The backlight 13 and the light control film 14 are turned off, and the external light incident from the sub LCD panel 12 becomes the light source of the main LCD panel 11, and the display on the main LCD panel 11 can be recognized (step S65). Similarly, the solar cell 15 is also irradiated with external light incident from the sub LCD panel 12, and the charging unit 40 can continue to be charged.

  In the normal mode, the display of the main LCD panel 11 is displayed and the backlight 13 and the light control film 14 are turned on at the same time, and the diffused light of the backlight 13 by the light control film 14 becomes the light source of the main LCD panel 11. 11 can be recognized (step S66). At this time, the solar cell 15 generates power by the diffused light of the backlight 13 by the light control film 14, and the charging unit 40 charges a battery (not shown).

  As described above, by performing charging using the solar cell 15 disposed between the main LCD panel 11 and the light control film 14, it is possible to extend the life of the battery without being restricted in design. .

  In the present embodiment, the solar cell 15 is disposed between the main LCD panel 11 and the light control film 14 and the power generation surface is directed toward the light control film 14. However, the solar cell 15 is disposed between the sub LCD panel 12 and the light control film 14. You may arrange | position and may arrange | position a power generation surface toward the LCD panel side. Different solar cells 15 may be arranged at two locations between the main LCD panel 11 and the light control film 14 and between the sub LCD panel 12 and the light control film 14.

<Fourth embodiment>
The cellular phone 1 according to the fourth embodiment can generate an electromagnetic induction electromotive force by forcibly rotating a vibrator motor from the outside using an antenna, and can charge the battery with this electromotive force. is there.

  The internal configuration of the mobile phone 1 according to the fourth embodiment will be described with reference to FIG. 8, FIG. 9, and FIG. FIG. 8 is a block diagram showing an example of the internal configuration of the mobile phone 1. In addition, the same code | symbol is attached | subjected to the part which is common in the block diagram of FIG. 2, and the detailed description is abbreviate | omitted. 2 is different from the block diagram shown in FIG. 2 in that a vibrator control unit 26, a vibrator driving unit 36, a vibrator motor 37, and a charging unit 40 are provided. FIGS. 9 and 10 are views showing the meshing mechanism of the antenna 16 and the vibrator motor 37.

  The vibrator control unit 26 drives a vibrator motor 37 via a vibrator drive unit 36 as necessary when a call is received. The rotating shaft of the vibrator motor 37 is provided with an eccentric weight 51, and when the vibrator motor 37 rotates, the mobile phone 1 vibrates and can notify the user of an incoming call or the like. The vibrator motor 37 uses a coreless motor for size reduction and weight reduction.

  The rotating shaft of the vibrator motor 37 and the antenna 16 have gears that can be meshed with each other, and the vibrator motor 37 is rotated by rotating the antenna 16 in the meshed state, so that the vibrator motor 37 is rotated. It is possible to generate an electromagnetic induction electromotive force. The electromotive force can be charged to a battery (not shown) by the charging unit 40. The charging unit 40 has a function of preventing overcharging of the battery by prohibiting charging from the vibrator motor 37 when the battery is fully charged.

  Next, the meshing mechanism of the antenna 16 and the vibrator motor 37 will be described. As shown in FIG. 9, the meshing mechanism includes an eccentric weight 51 provided on the rotation shaft of the vibrator motor 37, a first gear 52, a second gear 53 provided on the antenna 16, and the housing 10. The slide switch 55 is provided on the side surface and moves the second gear.

  FIG. 9A shows a normal use state, and FIG. 9B shows a state where charging by the vibrator motor 37 is possible. When the slide switch 55 is slid leftward from the normal use state shown in FIG. 9 (a) to the chargeable state shown in FIG. 8 (b), the second gear 53 fitted in the recess of the slide switch 55 slides. Along with the switch 55, it follows to the left. At this time, the first gear 52 and the second gear 53 mesh.

  As shown in FIG. 10, when the antenna 16 exposed from the housing 10 is rotated around the antenna axis in this state, the second gear provided in the antenna 16 is rotated, and the first gear is engaged by the meshing of the gear. Is rotated, and thereby the vibrator motor 37 is rotated. As described above, the electromotive force generated by the rotation of the vibrator motor 37 is charged to a battery (not shown) by the charging unit 40. With this configuration, charging is possible even in a dark place, and since the antenna 16 is used as an operation member, an operation member dedicated to charging is not necessary, and charging is possible because charging is possible simply by rotating the antenna 16. It is not necessary to secure a space for performing.

  When charging is performed by rotating the antenna 16, rotation of the vibrator due to an incoming call may be prohibited. In this case, the vibrator is prohibited in conjunction with the slide switch 55, and the incoming call is notified by sound.

  When the battery is fully charged, the main LCD panel 11 and the sub LCD panel 12 may be used to notify the user that the battery is fully charged. This is because when the battery is fully charged, no further charging is performed even if the antenna 16 is rotated by the function of preventing overcharging as described above.

FIG. 1 is a perspective view and a sectional view of a cellular phone 1 according to a first embodiment of the present invention. FIG. 2 is a block diagram illustrating an example of an internal configuration of the mobile phone 1 according to the first embodiment. FIG. 3 is a flowchart showing the operation of the mobile phone 1. FIG. 4 is a block diagram illustrating an example of an internal configuration of the mobile phone 1 according to the second embodiment. FIG. 5 is a flowchart showing the operation of the mobile phone 1. FIG. 6 is a perspective view and a sectional view of the mobile phone 1 according to the second embodiment of the present invention. FIG. 7 is a block diagram illustrating an example of an internal configuration of the mobile phone 1 according to the third embodiment. FIG. 8 is a block diagram illustrating an example of an internal configuration of the mobile phone 1 according to the fourth embodiment. FIG. 9 is a view showing a meshing mechanism of the antenna 16 and the vibrator motor 37. FIG. 10 is a diagram showing the meshing mechanism of the antenna 16 and the vibrator motor 37 and the rotation of the antenna.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mobile phone, 10 ... Housing | casing, 11 ... Main LCD panel, 12 ... Sub LCD panel, 13 ... Backlight, 14 ... Light control film, 15 ... Solar cell, 16 ... Antenna, 19 ... Operation part, 23 ... LCD Control part 24 ... Backlight control part 25 ... Light control film control part 26 ... Vibrator control part 29 ... Mode control part 33 ... LCD drive part 34 ... Backlight drive part 35 ... Light control film drive part , 36: Vibrator drive unit, 37: Vibrator motor, 39 ... Voltage detection unit, 40 ... Charging unit, 51 ... Eccentric weight, 52 ... First gear, 53 ... Second gear, 55 ... Slide switch

Claims (9)

A transmissive display panel arranged in front of the housing;
A display panel disposed on the back surface of the housing, wherein at least a part of the display panel is planarly overlapped with the transmissive display panel;
A dimming means disposed between the transmissive display panel and the display panel and capable of electrically adjusting light transmittance;
A transmittance switching means for changing the light transmittance of the light control means;
A backlight for irradiating the transmissive display panel with light from between the transmissive display panel and the dimming means;
Backlight control means for switching on and off of the backlight, and
The backlight is turned on to lower the light transmittance of the light control means, thereby diffusing the light of the backlight and emitting light to the transmissive display panel, or turning off the backlight and turning the light on. A portable device characterized by irradiating the back surface of the transmissive display panel with external light incident through the display panel by increasing the light transmittance of the light means. Mode switching means for switching between the normal mode and the power saving mode;
When the normal mode is set, the backlight is turned on to reduce the light transmittance of the light control means, thereby diffusing the light of the backlight and emitting the light to the transmissive display panel. Control means for irradiating the back surface of the transmissive display panel with external light incident through the display panel by turning off the backlight and increasing the light transmittance of the dimming means when set to the power mode When,
The mobile device according to claim 1, further comprising:   The portable device according to claim 2, wherein the mode switching unit manually switches the normal mode and the power saving mode. A power supply including a battery;
A remaining capacity detecting means for detecting the remaining capacity of the battery,
4. The portable device according to claim 2, wherein the mode switching unit switches to the power saving mode when the remaining capacity detecting unit detects a decrease in the remaining capacity of the battery. 5.   The portable device according to any one of claims 1 to 4, wherein the light control means decreases light transmittance by supplying power.   The portable device according to claim 1, wherein the light control means includes any one of a light control film, electronic paper, a transparent EL, and a transparent conductive film. A power supply including a battery;
A solar cell disposed between the transmissive display panel and the display panel and transmitting light;
A light charging means for charging the battery with an electromotive force generated by irradiating the solar cell with external light;
The mobile device according to claim 1, further comprising: The mobile device is a mobile phone;
A power supply including a battery;
A vibrator motor for notifying incoming calls;
A first gear provided on a shaft of the vibrator motor;
A second gear meshable with the first gear;
A rotation operating means for rotating the second gear;
Rotation charging means for charging the battery with electromotive force generated by rotating the rotation operation means to rotate a vibrator motor;
The mobile device according to claim 1, further comprising:   The portable device according to claim 8, wherein the rotation operation unit is a rod antenna that is rotatable about an antenna axis and at least a part of which is exposed from the casing.

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