JP2008085398A - Portable terminal device, function control method used for same, and function control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal device such as a cellular phone having improved usability in the dark. <P>SOLUTION: An electric signal pa to be output from an optical sensor 20 is inputted into an optical sensor control section 19, and the control section 19 measures illuminance pb in the vicinity of the portable terminal device 10. The acquired illuminance pb is temporarily stored in a storage section 16. The illuminance pb is compared to a light/dark determination threshold value stored in the storage section 16, and when the illuminance pb is larger than the light/dark determination threshold value, it is determined to be bright and a bright mode is selected to display a usual menu on an LCD 18. On the contrary, if the illuminance pb is smaller than the light/dark determination threshold value, a dark mode is selected to display an abbreviation menu on the LCD 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable terminal device, a function control method and a function control program used for the portable terminal device, and particularly generates a function for displaying each function menu on a display unit and a ring tone, such as a cellular phone. The present invention relates to a portable terminal device having a function, a function control method and a function control program used for the portable terminal device.

  In a mobile terminal device such as a mobile phone having a plurality of functions, all functions are rarely used in the dark, and often only limited functions are used. For example, functions such as the Internet and games are used in bright rooms and trains, while in the dark, alarm settings before sleep, e-mails, and music playback while moving at night are often performed. . In addition, when a user operates a mobile phone in the dark, there is a high possibility that it is not a business use but a private use such as when in a private room. Some of the functions used in this case are Since functions are often limited, it is considered unnecessary to display all functions on a menu. However, the conventional mobile phone has a problem in that it is troublesome to operate in the dark because menus corresponding to all functions are always displayed regardless of the surrounding brightness. For this reason, there is a need for a mobile phone that does not bother the operation in the dark.

Conventionally, as this type of technology, for example, there is one described in Patent Document 1.
In the cellular phone described in Patent Document 1 (in the same document, “portable terminal”), a detailed menu that comprehensively includes the functions of the entire cellular phone and frequently used functions are extracted from the detailed menu. And a simple menu having a hierarchical structure different from that of the detailed menu, and the detailed menu and the simple menu are exclusively switched and displayed. Since the detailed menu and the simple menu are provided, the user can easily perform the menu operation, which is excellent in usability.

In addition, in the mobile phone described in Patent Document 2 (in the same document, “portable terminal device”), an illuminance sensor is provided on the outer surface of the housing, and the output of the illuminance sensor is greater than or equal to a threshold by the display control circuit. On the other hand, when the display of the display unit is controlled to be turned on, when the output of the illuminance sensor is less than the threshold value, the display of the display unit is controlled to be turned off. The threshold value is set by a threshold setting circuit. As a result, the display unit is controlled to be turned off in a dark state such as when the portable terminal device is stored in a bag or the like, so that power consumption is reduced and usable time is extended.
JP 2003-058292 A (Abstract, FIG. 1) JP 2004-140472 A (Abstract, FIG. 5)

However, the above conventional mobile phone has the following problems.
That is, the mobile phone described in Patent Document 1 is similar to the present invention in that a detailed menu and a simple menu are provided, but it does not correspond to the surrounding light and dark, so the above problem The point is not improved.

  In the mobile phone described in Patent Document 2, when the surroundings are dark, the display unit is controlled to be turned off, thereby reducing the power consumption and extending the usable time. Not what you want.

  The present invention has been made in view of the above-described circumstances, and provides a mobile terminal device in which troublesomeness of operation in darkness is improved, a function control method and a function control program used in the mobile terminal device. It is an object.

  In order to solve the above-mentioned problem, the invention according to claim 1 relates to a portable terminal device, according to brightness detection means for detecting brightness around the device, and brightness detected by the brightness detection means. It is characterized by comprising display control means for adjusting the display object.

  A second aspect of the present invention relates to the portable terminal device according to the first aspect, wherein the brightness detecting unit includes an illuminance measuring unit that measures the illuminance around the portable terminal device, and the display control unit includes The display object is adjusted in steps based on the illuminance measured by the illuminance measurement unit.

  A third aspect of the present invention relates to the portable terminal device according to the second aspect, wherein the display object is set to a light mode for unlimited display and a dark mode for limited display according to surrounding light and darkness. The display control means compares the illuminance measured by the illuminance measurement unit with a predetermined light / dark determination threshold, and selects the light mode when the illuminance is greater than the light / dark determination threshold, while the illuminance is It is characterized by comprising a mode selection section for selecting the dark mode when it is smaller than the light / dark judgment threshold.

  According to a fourth aspect of the present invention, there is provided the portable terminal device according to the second aspect, wherein the display object is set to a light mode for unlimited display and a dark mode for limited display according to surrounding light and darkness. A timing unit for generating current time information is provided, and the display control unit compares the illuminance measured by the illuminance measurement unit with a predetermined brightness / darkness determination threshold, and the current time information is preset. It is determined whether it is within the daytime range, and when the illuminance is greater than the brightness determination threshold, or when the current time information is within the daytime range, the light mode is selected while the illuminance Is smaller than the light / dark determination threshold and the dark mode is selected when the current time information is outside the daytime time range.

  According to a fifth aspect of the present invention, there is provided a brightness detecting unit for detecting brightness around the device, and an incoming call for adjusting a volume of a ringtone according to the brightness detected by the brightness detecting unit. And a sound control means.

  A sixth aspect of the present invention relates to the portable terminal device according to the fifth aspect, wherein the brightness detection unit includes an illuminance measurement unit that measures the illuminance around the portable terminal device, and the ring tone control unit includes: The volume of the ringtone is adjusted stepwise or continuously based on the illuminance measured by the illuminance measuring unit.

  A seventh aspect of the invention relates to the portable terminal device according to the second, third, fourth, or sixth aspect, wherein the illuminance measuring unit converts the ambient light of the portable terminal device into an electrical signal and outputs the electrical signal. And an optical sensor control unit that measures the illuminance around the portable terminal device based on the electrical signal output from the optical sensor.

  The invention according to claim 8 relates to a function control method used for a mobile terminal device, and includes brightness detection processing for detecting brightness around the mobile terminal device and brightness detected by the brightness detection means. A display control process for adjusting the display target is performed accordingly.

  The invention according to claim 9 relates to the function control method according to claim 8, wherein in the brightness detection process, the illuminance around the portable terminal device is measured, and in the display control process, the measured illuminance is measured. Based on this, the display object is adjusted step by step.

  A tenth aspect of the present invention relates to the function control method according to the ninth aspect of the present invention, wherein a bright mode for unlimited display and a dark mode for restrictive display are set on the display object according to surrounding light and darkness. In the display control process, the measured illuminance is compared with a predetermined light / dark determination threshold, and the light mode is selected when the illuminance is larger than the light / dark determination threshold, while the illuminance is the light / dark determination threshold. The dark mode is selected when it is smaller than.

  The invention according to claim 11 relates to the function control method according to claim 9, wherein a bright mode for unlimited display and a dark mode for restrictive display are set on the display object according to surrounding light and darkness. In the display control process, the measured illuminance is compared with a predetermined light / dark determination threshold value, and the current time information is within a preset daytime range. The brightness mode is selected when the illuminance is greater than the light / dark determination threshold, or when the current time information is within the daytime range, while the illuminance is the light / dark determination threshold. And the dark mode is selected when the current time information is outside the daytime range.

  The invention according to claim 12 relates to a function control method used for a portable terminal device, and relates to a brightness detection process for detecting brightness around the device and a ring tone according to the brightness detected by the brightness detection means. And a ringing tone control process for adjusting the volume of the incoming call.

  A thirteenth aspect of the present invention relates to the function control method according to the twelfth aspect of the present invention, wherein the brightness detection process measures the illuminance around the portable terminal device, and the ring tone control process measures the illuminance measured. Based on the above, the volume of the ringtone is adjusted stepwise or continuously.

  A fourteenth aspect of the invention relates to a function control program, which causes a computer to control the portable terminal device according to any one of the first to seventh aspects.

  According to the configuration of the present invention, the display target is adjusted according to the brightness around the portable terminal device, so that the usability can be improved. In addition, since the display target is gradually adjusted based on the illuminance measured by the illuminance measurement unit, the usability can be improved. In addition, the bright mode and the dark mode are set for the display target, and the display control unit selects the bright mode when the illuminance is larger than the light / dark determination threshold, while the dark mode is selected when the illuminance is smaller than the light / dark determination threshold. Since it is selected, an operation corresponding to an appropriate mode is performed according to the brightness of the surroundings, the troublesome operation can be eliminated, and the usability can be improved. Further, when the illuminance is larger than the light / dark determination threshold or when the current time information is in the daytime time range, the light mode is selected by the display control means, while the illuminance is smaller than the light / dark determination threshold and the current time Since the dark mode is selected when the information is outside the daytime range, for example, even when the user is in a dark place such as a dark room during the daytime, it is determined to be bright and the same processing as when the surrounding is bright is performed. In addition, usability can be improved. Further, since the brightness of the surroundings is detected by the brightness detection means, and the volume of the ringtone is adjusted according to the brightness by the ringtone control means, the usability can be improved.

  A mobile terminal device that detects ambient light and dark and displays all icons as a menu when the surroundings are bright based on a result of the light and dark detection, and displays only a specific icon when the surroundings are dark, and the mobile terminal device A function control method and a function control program used for the above are provided.

FIG. 1 is a block diagram showing an electrical configuration of a main part of a portable terminal device according to the first embodiment of the present invention.
As shown in the figure, the mobile terminal device of this example is a mobile phone 10, and includes an antenna 11, a radio unit 12, a microphone 13, a camera 14, a receiver 15, a storage unit 16, and an operation key 17. And an LCD (Liquid Crystal Display) 18, an optical sensor controller 19, an optical sensor 20, a controller 21, and a secondary battery 22. The antenna 11 transmits and receives radio waves W to and from a radio base station (not shown). The radio base station is connected to the general telephone network via a mobile communication control station, a mobile communication switching center in the area, and a gateway mobile communication switching station (not shown). The radio unit 12 includes a receiving circuit, a transmitting circuit, a frequency synthesizer, and the like (not shown).

  The microphone 13 receives a user's voice and performs transmission. The camera 14 has, for example, a CCD (Charge Coupled Device) sensor having 4 million pixels and captures an image around the mobile phone 10. The receiver 15 generates sound corresponding to various types of information such as a ring tone (for example, ringtone) and a voice during a call. The operation keys 17 include a transmission key, alphabet / kana / kanji / number conversion keys, a power on / off key, a cross key for cursor operation, an end key, and the like. In a normal voice call, the LCD 18 displays various information such as the telephone number information and icon information of the other party, and displays an image stored in the storage unit 16. The function for displaying the above phone number information and icon information can change the number of information to be displayed, and the function for generating ringtones can change the volume of the ringtones. This is a function that can be performed with or without.

  The optical sensor 20 is composed of, for example, CdS (cadmium sulfide), a solar battery, or the like, and converts the ambient light of the mobile phone 10 into an electric signal pa and outputs it. The optical sensor control unit 19 measures the illuminance pb around the mobile terminal device 10 based on the electrical signal pa output from the optical sensor 20. The storage unit 16 is composed of, for example, a RAM (Randam Access Memory) or the like, and stores an image captured by the camera 14, temporarily stores the illuminance pb measured by the optical sensor control unit 19, and is based on the illuminance pb. Then, a light / dark determination threshold value for determining light and darkness around the mobile terminal device 10 is stored. The control unit 21 includes a CPU (Central Processing Unit) 21a that controls the entire mobile phone 10, and a ROM (Read Only Memory) 21b in which a function control program for operating the CPU 21a is recorded. In particular, in this embodiment, the control unit 21 is set with a bright mode for displaying the display target on the LCD 18 indefinitely according to the brightness of the surroundings of the mobile terminal device 10 and a dark mode for displaying it limitedly. In addition, the illuminance pb stored in the storage unit 16 is compared with a light / dark determination threshold, and the light mode is selected when the illuminance pb is larger than the light / dark determination threshold, while the light illuminance pb is equal to the light / dark determination threshold. When it is smaller than the above, the dark mode is selected. Further, the control unit 21 has a function of turning on / off the function itself for selecting the dark mode by the operation key 17. The secondary battery 22 is constituted by a lithium ion battery, for example, and supplies power to each part of the mobile phone 10.

FIG. 2 is a front view showing an open state when the casing of the mobile phone 10 of FIG. 1 is configured to be foldable.
As shown in FIG. 2, the mobile phone 10 includes a unit 31, a unit 32, and a hinge part 33. The unit 31 includes a receiver 15, an LCD 18 and an optical sensor 20 on the front surface, and the camera 14 shown in FIG. The unit 32 includes a microphone 13 and an operation key 17 on the front surface, and includes a storage unit 16, an optical sensor control unit 19, a control unit 21, and a secondary battery 22 in FIG. 1. Then, the unit 31 and the unit 32 are configured to be folded via the hinge portion 33 in such a manner that the front surface of the unit 31 and the front surface of the unit 32 face each other.

FIG. 3 is a flowchart for explaining the operation of the mobile phone 10 of FIG. 1 and FIG. 4 is a diagram showing an example of a menu screen displayed on the LCD 18.
With reference to these drawings, processing contents of the function control method used in the mobile phone 10 of this example will be described.
In the cellular phone 10, the display target is adjusted according to the ambient brightness. In this case, a bright mode for unlimited display and a dark mode for restrictive display are set in the display target according to the brightness of the surroundings of the mobile terminal device 10. Then, ambient brightness is detected (brightness detection processing). Based on the brightness detection result, the same brightness mode is selected when the surroundings are bright, and the same dark mode is selected when the surroundings are dark. In this case, the illuminance pb around the mobile terminal device 10 is measured by the optical sensor control unit 19. Then, the control unit 21 compares the measured illuminance pb with the light / dark determination threshold, and the light mode is selected when the illuminance pb is larger than the light / dark determination threshold, while the light illuminance pb is the same light / dark determination threshold. The dark mode is selected when it is smaller than (display control processing).

  That is, as shown in FIG. 3, the electric signal pa output from the optical sensor 20 is input to the optical sensor control unit 19, and the optical sensor control unit 19 measures the illuminance pb around the portable terminal device 10 ( Brightness detection process, step A1). The acquired illuminance pb (illuminance information) is temporarily stored in the storage unit 16 (step A2). The illuminance pb is compared with the light / dark determination threshold stored in the storage unit 16 (step A3, branch a). When the illuminance pb is larger than the light / dark determination threshold, the light is determined to be bright and the light mode is selected. A normal menu is displayed on the LCD 18 (step A4). On the other hand, when the illuminance pb is smaller than the light / dark determination threshold, it is determined to be dark, the dark mode is selected, and the omitted menu is displayed on the LCD 18 (display control process, step A5).

  In the display of the normal menu in step A4, as shown in FIG. 4A (example of normal menu), a menu M1 with no particular limitation on the number of icons is displayed. The menu M1 represents an icon for calling all functions of the mobile phone 10. In the display of the abbreviated menu in step A5, as shown in FIG. 4B (example of abbreviated menu), a menu M2 with a limited number of icons is displayed. The menu M2 represents not only all functions of the mobile phone 10 but icons limited to functions that are supposed to be used in the dark, and icons (for calling all functions in the dark) ( "Normal menu call").

  As described above, in the first embodiment, the illuminance pb around the mobile terminal device 10 is measured by the optical sensor control unit 19, the measured illuminance pb is compared with the light / dark determination threshold, and the illuminance pb is the same. The bright mode is selected when it is larger than the light / dark determination threshold, while the dark mode is selected when the same illuminance pb is smaller than the light / dark determination threshold. Therefore, only necessary functions in the darkness are displayed and operated. Will be eliminated and usability will be improved.

FIG. 5 is a block diagram showing an electrical configuration of a mobile phone according to a second embodiment of the present invention. Elements common to those in FIG. 1 showing the first embodiment are denoted by common reference numerals. Has been.
In the cellular phone 10A of this example, as shown in FIG. 5, a timer unit 23 is added, and a control unit 21A to which a new function is added is provided instead of the control unit 21 in FIG. Yes. The timer unit 23 has a clock function and generates current time information ta. In addition to the function of the control unit 21, the control unit 21 </ b> A compares the illuminance pb stored in the storage unit 16 with the light / dark determination threshold value, and within the daytime time range in which the current time information ta is stored in the storage unit 16. (E.g., from 6 o'clock to 18 o'clock) and select the light mode when the illuminance pb is greater than the light / dark determination threshold or when the current time information ta is within the daytime time range On the other hand, the dark mode is selected when the illuminance pb is smaller than the light / dark determination threshold and the current time information ta is outside the daytime time range. The other configuration is the same as that shown in FIG.

FIG. 6 is a flowchart for explaining the operation of the mobile phone 10A of FIG.
With reference to this figure, the processing content of the function control method used for the mobile phone 10A of this example will be described.
In this cellular phone 10A, ambient light and darkness is detected and current time information is acquired. Based on these lightness and darkness detection results and current time information, the surroundings are bright or the current time information is within the daytime range. The bright mode is selected at a certain time, while the dark mode is selected when the surrounding is dark and the current time information is outside the same daytime range. In this case, the illuminance pb around the mobile terminal device 10A is measured by the optical sensor control unit 19 (brightness detection processing), and the current time information ta is generated by the time measurement unit 23 (time measurement processing). Then, the control unit 21A compares the measured illuminance pb with the light / dark determination threshold and determines whether or not the current time information ta is within the daytime time range, and the illuminance pb is greater than the light / dark determination threshold. When it is large or when the current time information ta is within the same daytime range, the bright mode is selected, while the same illuminance pb is smaller than the same brightness determination threshold and the current time information ta is the same daytime range. When it is outside, the dark mode is selected (display control processing).

  That is, as shown in FIG. 6, in steps B1, B2, and B3, the same processing as in steps A1, A2, and A3 in FIG. 3 of the first embodiment is performed, respectively, and in step B3, the illuminance pb Is smaller than the light / dark determination threshold value, and it is determined that the image is dark, the process proceeds to step B6 (branch b). In Step B6, the daytime time range stored in the storage unit 16 is compared with the current time information ta, and when the current time information ta is within the same daytime time range, it is determined that it is bright and the process proceeds to Step B4. When the same processing as step A4 in FIG. 3 is performed and the current time information ta is out of the same daytime time range, it is determined to be dark and the process proceeds to step B5, and the same processing as step A5 in FIG. Done. Thus, when the user is in a dark place such as a dark room during the daytime, it is determined that the user is bright, and the same processing as when the surrounding is bright is performed.

  As described above, in the second embodiment, even when the illuminance pb is smaller than the same brightness determination threshold, if the current time information ta is within the daytime range, the same illuminance pb is lower than the same brightness determination threshold. Since the same processing as that for the case of large is performed, the usability is further improved in addition to the advantages of the first embodiment.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiment, and even if there is a design change without departing from the gist of the present invention, Included in the invention.
For example, in FIG. 4B of the first embodiment, the icons included in the displayed menu M2 cannot be selected by the user. For example, FIG. Like the menu M3 shown in FIG. 5), by adding the icons “custom 1” and “custom 2”, a more convenient menu configuration is realized even though the function to be displayed is limited.

  Moreover, in the said Example, although the menu to display was switched according to the brightness of the circumference | surroundings of the portable terminal devices 10 and 10A, you may switch the telephone directory to display, for example, as shown in FIG. In this case, when the surroundings are bright, all registered telephone numbers are displayed as in the telephone book D1 shown in FIG. 8A (normal telephone book display example), while when the surroundings are dark, FIG. ) Only the telephone numbers for which the flag F in FIG. 8A is “◯” are displayed as in the telephone book D2 shown in (Omitted telephone book display example). However, in this case, it is necessary to register the flag F in the storage unit 16 or the like in advance. Further, for example, when displaying a call origination / reception history, when the surroundings are dark, it is also possible to display not only a normal call origination / reception history but only a telephone number that is frequently called or frequently visited. However, in this case, it is necessary to count the frequency of outgoing / incoming calls in advance and store it in the storage unit 16 or the like.

  Further, when the surroundings are dark, the ring volume may be reduced stepwise as compared to when it is bright. This improves usability when the surroundings are quiet, for example, at night. Also, when the surroundings are dark, the ring volume may be increased stepwise as compared to when it is bright. Thereby, when the portable terminal devices 10 and 10A are stored in a bag or the like, usability is improved. However, in this case, when the casing of the mobile terminal device 10 or 10A is a foldable type as shown in FIG. 2, the optical sensor 20 is arranged on the back side of the unit 31 in order to detect surrounding light and darkness in the folded state. There is a need to. In this case, the incoming call volume may be continuously adjusted according to the brightness. In each of the above-described embodiments, the brightness determination is performed in two stages based on the light / dark determination threshold value, but may be performed in three or more stages by providing other light / dark determination threshold values. The LCD 18 may be EL (electroluminescence) or the like. The mobile terminal device is not limited to a mobile phone, and may be a PDA (Personal Digital Assistants), for example. Further, the casings of the mobile phones 10 and 10A are not limited to the folding type of the above embodiment, but may be a straight type, a slide type, or a rotary type.

  The present invention can be applied to all portable terminal devices that perform predetermined display operations and ringtones.

It is a block diagram which shows the electric constitution of the principal part of the portable terminal device which is 1st Example of this invention. It is a front view which shows the open state in case the housing | casing of the mobile telephone 10 of FIG. 1 is comprised by the folding type. 3 is a flowchart for explaining the operation of the mobile phone 10 of FIG. It is a figure which shows the example of the menu screen displayed on LCD18. It is a block diagram which shows the electric constitution of the mobile telephone which is 2nd Example of this invention. 6 is a flowchart for explaining the operation of the mobile phone 10A of FIG. It is a figure which shows the modification of an abbreviated menu. It is a figure which shows the example of a display of a telephone directory.

Explanation of symbols

10, 10A mobile phone (mobile terminal device)
11 Antenna (part of portable terminal device)
12 Radio unit (part of portable terminal device)
13 Microphone (part of portable terminal device)
14 Camera (part of portable terminal device)
15 Receiver (part of portable terminal device)
16 Storage unit (part of display control means)
17 Operation keys (part of portable terminal device)
18 LCD (Liquid Crystal Display)
19 Optical sensor control unit (part of illuminance measurement unit)
20 Optical sensor (part of illuminance measurement unit)
21, 21A control unit (part of display control means)
22 Secondary battery (part of portable terminal device)
23 Timekeeping (Timekeeping means)
31 units (part of portable terminal device)
32 units (part of portable terminal device)
33 Hinge part (part of portable terminal device)

Claims (14)

Brightness detection means for detecting brightness around the device;
A portable terminal device comprising: a display control unit that adjusts a display target according to the brightness detected by the brightness detection unit. The brightness detection means includes
An illuminance measurement unit that measures the illuminance around the mobile terminal device is provided,
The display control means includes
The portable terminal device according to claim 1, wherein the display target is adjusted step by step based on the illuminance measured by the illuminance measurement unit. The display object is set to a light mode for unlimited display and a dark mode for restrictive display according to the surrounding light and dark,
The display control means includes
When the illuminance measured by the illuminance measurement unit is compared with a predetermined light / dark determination threshold and the light mode is selected when the illuminance is larger than the light / dark determination threshold, while the illuminance is smaller than the light / dark determination threshold The mobile terminal device according to claim 2, further comprising a mode selection unit that selects the dark mode. The display object is set to a light mode for unlimited display and a dark mode for restrictive display according to the surrounding light and dark,
A timekeeping means for generating current time information is provided,
The display control means includes
The illuminance measured by the illuminance measurement unit is compared with a predetermined light / dark determination threshold, and it is determined whether the current time information is within a preset daytime range, and the illuminance is the light / dark determination threshold. Is selected when the current time information is within the daytime range, the illuminance is smaller than the brightness determination threshold, and the current time information is outside the daytime range. 3. The portable terminal device according to claim 2, wherein the mobile terminal device is configured to select the dark mode when the mobile phone is in the network. Brightness detection means for detecting brightness around the device;
A mobile terminal device comprising: a ringtone control means for adjusting the volume of a ringtone according to the brightness detected by the brightness detection means. The brightness detection means includes
An illuminance measurement unit that measures the illuminance around the mobile terminal device is provided,
The ring tone control means includes
The mobile terminal device according to claim 5, wherein the ringtone volume is adjusted stepwise or continuously based on the illuminance measured by the illuminance measurement unit. The illuminance measurement unit
An optical sensor that converts light around the mobile terminal device into an electrical signal and outputs the electrical signal;
The optical sensor control part which measures the illumination intensity around the said portable terminal device based on the said electrical signal output from this optical sensor, It is comprised, The Claim 2, 3, 4, or 6 characterized by the above-mentioned. Mobile terminal device. A function control method used in a mobile terminal device,
Brightness detection processing for detecting brightness around the portable terminal device;
A function control method, comprising: performing display control processing for adjusting a display target in accordance with the brightness detected by the brightness detection means. In the brightness detection process,
Measure the illuminance around the mobile terminal device,
In the display control process,
9. The function control method according to claim 8, wherein the display object is adjusted stepwise based on the measured illuminance. The display object is set to a bright mode for displaying indefinitely and a dark mode for displaying in a limited manner according to surrounding light and darkness,
In the display control process,
The measured illuminance is compared with a predetermined light / dark determination threshold, and the light mode is selected when the illuminance is larger than the light / dark determination threshold, while the dark mode is selected when the illuminance is smaller than the light / dark determination threshold. The function control method according to claim 9, wherein the function is selected. The display object is set to a bright mode for displaying indefinitely and a dark mode for displaying in a limited manner according to surrounding light and darkness,
Perform a timekeeping process to generate current time information,
In the display control process,
When the measured illuminance is compared with a predetermined light / dark determination threshold, it is determined whether the current time information is within a preset daytime range, and the illuminance is greater than the light / dark determination threshold Or when the current time information is within the daytime range, the light mode is selected, while the illuminance is smaller than the brightness determination threshold and the current time information is outside the daytime range. The function control method according to claim 9, wherein the dark mode is selected. A function control method used in a mobile terminal device,
Brightness detection processing to detect the brightness around the device;
A function control method, comprising: performing a ringtone control process for adjusting the volume of a ringtone according to the brightness detected by the brightness detection means. In the brightness detection process,
Measure the illuminance around the mobile terminal device,
In the ring tone control process,
The function control method according to claim 12, wherein the volume of the ringtone is adjusted stepwise or continuously based on the measured illuminance.   The function control program for making a computer control the portable terminal device as described in any one of Claims 1 thru | or 7.

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