JP2006324926A - Mobile terminal device and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device capable of adjusting luminance of a display means according to photographing environment, based on not a result of calculation by a CPU but on an information outputted from a photographing means, and to provide a control method of a lighting means for adjusting luminance on the display means. <P>SOLUTION: A cellular phone 1 comprises a camera 3 for photographing an image by changing a frame rate (image capturing period) according to photographing environment such as surrounding brightness. The image photographed with the camera 3 is displayed by a display unit 2. The display unit 2 is illuminated by backlight to make the displayed image on the display unit 2 easy to see. Moreover, backlight is controlled by a control means based on the frame rate outputted from the camera 3, so that a light emission quantity of light emitted from backlight is adjusted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable terminal device that automatically adjusts the brightness of a display unit according to ambient brightness and a control method thereof.

Mobile phone, PHS (Personal Handyphone System) and PDA (Personal Digital)
Mobile terminal devices such as Assistance (LCD) are used to display information.
In addition, display means such as a backlight is provided to illuminate the display means in order to improve the visibility of the display means.

Some portable terminal devices including such display means and illumination means include CMOS (
Complementary Metal Oxide Semiconductor) and CCD (Charge Coupled)
Devices) There are portable terminal devices equipped with photographing means such as cameras. Since the mobile terminal device provided with the image capturing unit consumes more current when the image capturing unit is operated, the driving time of the mobile terminal device tends to be shorter than that of the mobile terminal device not provided with the image capturing unit. .

  Therefore, as a method for extending the driving time of the mobile terminal device provided with the photographing means, there is a method of increasing the driving time by appropriately controlling the backlight. For example, a method is known in which an optical sensor that detects ambient brightness is provided in a portable terminal device, and the backlight is controlled based on the brightness detected by the optical sensor. However, since the portable terminal device using this method needs to be provided with new parts such as an optical sensor, the portable terminal device is increased in size, and further, the production cost is increased. Therefore, there is a demand for a portable terminal device that adjusts the luminance of the display means without changing the configuration of the portable terminal device.

  A typical prior art is described in Patent Document 1. The mobile terminal of Patent Document 1 converts an image signal output from a light receiving element of a CCD camera into a light intensity value. Then, ambient brightness is calculated from the intensity value of the light, and the backlight is controlled based on the calculation result.

JP 2003-289368 A

  According to the mobile terminal of Patent Document 1, it is possible to control the backlight according to the ambient brightness without changing the configuration of the mobile terminal device. Specifically, the brightness of the display means can be lowered when the surroundings are bright, and the brightness of the display means can be increased when the surroundings are dark. However, in this mobile terminal, it is necessary for the CPU to calculate the ambient brightness based on information such as an image signal output from the CCD camera, and to set the brightness of the display means based on the calculation result. Therefore, there is a problem that a large load is applied to the CPU in order to control the backlight. Further, there is no description about controlling the backlight based on information output from the photographing means.

  An object of the present invention is to adjust the brightness of a display device and a mobile terminal device that can adjust the brightness of a display unit according to a shooting environment based on information output from the shooting unit, not a calculation result by a CPU. It is providing the control method of the illumination means for doing.

The present invention includes a photographing means for photographing an image by changing a frame rate according to a photographing environment;
Display means for displaying an image photographed by the photographing means;
Illumination means for illuminating the display means;
A portable terminal device comprising: control means for controlling the illumination means based on the frame rate so as to adjust the luminance of the display means.

  Further, the present invention is characterized in that the control means adjusts the luminance of the display means every predetermined time.

  In the invention, it is preferable that the control unit adjusts the luminance of the display unit when the frame is switched.

The present invention also comprises an operation unit illumination means for illuminating the operation unit,
The control unit controls the operation unit illumination unit based on the frame rate so as to adjust the luminance of the operation unit.

The present invention is also a method for controlling the illumination means of a mobile terminal device comprising a photographing means,
Illumination means for illuminating the display means so as to adjust the luminance of the display means for displaying an image based on the frame rate output from the photographing means for photographing an image by changing the frame rate according to the photographing environment. Is a control method characterized by controlling.

Further, the present invention is characterized in that the luminance of the display means is adjusted every predetermined time.
The present invention is characterized in that the brightness of the display means is adjusted when the frame is switched.

  According to the present invention, an operation unit illumination unit that illuminates the operation unit is controlled based on the frame rate so as to adjust the luminance of the operation unit.

  According to the present invention, there is provided a mobile terminal device including an image capturing unit that captures an image by changing a frame rate that is an image capture period in accordance with an imaging environment such as ambient brightness. An image photographed by the photographing means is displayed. Further, the display unit is illuminated by the illumination unit, thereby making it easy to see the image displayed on the display unit. Further, the control means controls the illumination means based on the frame rate output from the photographing means. By doing so, the amount of light emitted from the illumination unit can be adjusted based on the frame rate that changes according to the shooting environment output from the shooting unit, not the calculation result by the CPU. The luminance of the display means can be adjusted to an appropriate luminance according to the shooting environment without changing the configuration of the mobile terminal device and without applying a large load on the CPU.

  According to the invention, the control means adjusts the luminance of the display means every predetermined time. By doing so, even if the frame rate changes, the amount of light emitted from the illumination means does not change for a predetermined time, so even if the frame rate changes frequently, the brightness of the display means frequently It will not change. That is, flickering of the display means can be prevented.

  According to the invention, the control means adjusts the luminance of the display means when the frame is switched. By doing so, the light emission amount of light emitted from the illumination means is adjusted based on the frame rate immediately before the frame is switched, so that it can be adjusted to a light emission amount suitable for the frame output from the photographing means, The brightness of the display means can be adjusted to a more appropriate brightness.

  In addition, according to the present invention, the operation unit illumination unit that illuminates the operation unit is provided, and the amount of light emitted from the operation unit illumination unit is calculated by the control unit based on the frame rate output from the photographing unit. Control the illumination means to adjust. By doing so, the amount of light emitted from the illumination unit can be adjusted based on the frame rate that changes according to the shooting environment output from the shooting unit, not the calculation result by the CPU. The luminance of the operation unit can be adjusted to an appropriate luminance according to the shooting environment without changing the configuration of the mobile terminal device and without applying a large load on the CPU.

  In addition, according to the present invention, the control method of the illumination unit of the mobile terminal device including the imaging unit that captures the image by changing the frame rate that is the image capturing period according to the imaging environment such as ambient brightness. It is. In this portable terminal device, the display means displays an image taken by the photographing means, and the illumination means illuminates the display means so that the image displayed on the display means is easy to see. The illumination unit controls the illumination unit based on the frame rate output from the imaging unit. By doing so, the amount of light emitted from the illumination unit can be adjusted based on the frame rate that changes according to the shooting environment output from the shooting unit, not the calculation result by the CPU. The luminance of the display means can be adjusted to an appropriate luminance according to the shooting environment without changing the configuration of the mobile terminal device and without applying a large load on the CPU.

  According to the invention, the luminance of the display means is adjusted every predetermined time. By doing so, even if the frame rate changes, the amount of light emitted from the illumination means does not change for a predetermined time, so even if the frame rate changes frequently, the brightness of the display means frequently It will not change. That is, flickering of the display means can be prevented.

  According to the present invention, the luminance of the display means is adjusted when the frame is switched. By doing so, the light emission amount of light emitted from the illumination means is adjusted based on the frame rate immediately before the frame is switched, so that it can be adjusted to a light emission amount suitable for the frame output from the photographing means, The brightness of the display means can be adjusted to a more appropriate brightness.

  According to the invention, the operation unit illumination unit that illuminates the operation unit is controlled so as to adjust the luminance of the operation unit based on the frame rate output from the photographing unit. By doing so, the amount of light emitted from the illumination unit can be adjusted based on the frame rate that changes according to the shooting environment output from the shooting unit, not the calculation result by the CPU. The luminance of the operation unit can be adjusted to an appropriate luminance according to the shooting environment without changing the configuration of the mobile terminal device and without applying a large load on the CPU.

  Hereinafter, the present invention will be described in detail by embodiments. In the present embodiment, a mobile phone including a camera will be described as one mobile terminal device. The mobile phone according to the present embodiment is a mobile phone having a so-called power saving mode in which power consumption can be reduced by automatically adjusting the brightness of the display means in accordance with the shooting environment such as ambient brightness. is there.

  FIG. 1 is a schematic diagram of a mobile phone 1 according to the first embodiment of the present invention. FIG. 1A is a front view of the mobile phone 1, and FIG. 1B is a rear view of the mobile phone 1. As shown in FIG. 1, the mobile phone 1 is a foldable mobile phone having a display unit 2, a camera 3, and an operation unit 4.

  The display unit 2 displays information such as images captured by the camera 3 and characters input by the operation unit 4. The display unit 2 is realized by a color LCD, for example. The display unit 2 corresponds to display means.

  The camera 3 captures a landscape, a person, and the like by converting incoming light into an electrical signal and generating image data. The camera 3 is realized by a CMOS camera having a function of changing a frame rate, which is a frame (image data for one screen) capturing period, according to ambient brightness. Such a CMOS camera outputs image data for one screen and switches image data to newly generate image data when the amount of electrons obtained by converting incoming light reaches a predetermined amount. When the surroundings become brighter, the time for a predetermined amount of electrons obtained by converting the incoming light is shortened, and the switching of image data becomes faster, so that the frame rate is increased. In addition, when the surroundings become dark, the time for a predetermined amount of electrons obtained by converting the incoming light becomes longer, and the switching of the image data becomes slower, so the frame rate becomes lower. The camera 3 corresponds to a photographing unit.

  The operation unit 4 inputs predetermined information by an operation by the user. The operation unit 4 is realized by a plurality of keys for inputting numeric data, character data, instructions to the mobile phone 1, and the like. For example, there is a power key for turning the mobile phone 1 on or off. Keys for inputting commands to the mobile phone 1 include keys for instructing image data generated by the camera 3 to be stored in a memory described later, that is, a shutter key for instructing the mobile phone 1 to take a picture. It is. These keys are formed of a translucent member, for example, a transparent resin such as an acrylic resin.

  In the mobile phone 1, the display unit 2 and the operation unit 4 are installed on the same side, and the surface on which the display unit 2 and the operation unit 4 are installed is the front. The camera 3 is installed on the surface opposite to the surface on which the display unit 2 and the operation unit 4 are installed, and the surface on which the camera 3 is installed is the back surface.

  FIG. 2 is a block diagram showing an electrical configuration of the mobile phone 1 according to the first embodiment of the present invention. As shown in FIG. 2, the mobile phone 1 includes a display unit 2, a camera 3, an operation unit 4, a CPU 10, a memory 11, a backlight 12, a backlight control unit 13, an antenna 14, a communication control unit 15, a receiver 16, and a microphone. 17 and a voice control unit 18.

  The CPU 10 controls the mobile phone 1. The CPU 10 monitors the operation unit 4 and performs processing based on the user's key operation. The CPU 10 performs transmission / reception of a program or various data from the memory 11 according to a signal from the operation unit 4, activates the camera 3, transmits data to the display unit 4, and controls the mobile phone 1. When the camera 3 is activated, the CPU 10 receives image data from the camera 3, temporarily stores it in the memory 11, and transmits display data to the display unit 2. That is, the CPU 10 converts the image data output from the camera 3 into display data and causes the display unit 2 to display it. The display data at this time may include not only image data from the camera 3 but also other information specific to the mobile phone. When the CPU 10 detects a camera image storage operation such as pressing the shutter key of the operation unit 4, the CPU 10 stores the image data output by the camera 3 in the memory 11.

  The memory 11 stores an operation program and data for operating the mobile phone 1. The data includes image data generated by the camera 3, numerical data and character data input by the operation unit 4, and the like.

  The backlight 12 includes a backlight for the display unit that illuminates the display unit 2 and a backlight for the operation unit that illuminates the operation unit 4, and illuminates the display unit 2 and the operation unit 4 to display the display unit 2 and the operation unit. Increase the brightness of 4. The backlight control unit 13 turns on and off the backlight 12 according to a signal from the CPU 10. Further, when the vertical synchronization signal output from the camera 3 is received when the backlight 12 is turned on, the backlight control unit 13 measures the frame rate and adjusts the luminance of the backlight 12 according to the frame rate. . The vertical synchronization signal transmitted from the camera 3 is a signal for measuring timing when displaying an image on the display unit 2 based on the frame. The vertical synchronization signal is output when an image captured by the camera 3 is displayed on the display unit 2 and is transmitted to the CPU 10. In the present embodiment, the vertical synchronization signal is output even when the power saving mode is set, and is transmitted to the backlight control unit 13. The frame rate is measured based on the received vertical synchronization signal. The backlight control unit 13 supplies a driving current to the backlight 12 to emit light so that the luminance of the display unit 2 becomes a predetermined luminance. The backlight control unit 13 corresponds to a control unit.

  The antenna 14 transmits and receives radio waves including audio signals for telephone communication with the base station. The communication control unit 15 demodulates the audio signal transmitted from the base station and received via the antenna 14 and outputs the demodulated audio signal to the CPU 10. In addition, the communication control unit 15 modulates and amplifies the audio signal output from the CPU 10, and transmits it to the base station via the antenna 14.

  The audio control unit 18 modulates the audio signal demodulated by the communication control unit 15 and outputs the audio via the receiver 16. In addition, the voice control unit 18 demodulates the voice input via the microphone 17 and outputs the demodulated voice signal to the CPU 10.

  The mobile phone 1 receives the radio wave including the audio signal by the antenna 14, outputs the audio from the receiver 16 based on the audio signal, and receives the radio wave including the audio signal from the antenna 14 based on the audio input from the microphone 17. Since the transmission is performed, the operator can make a call.

  FIG. 3 is a flowchart showing the control of the backlight 12 of the mobile phone 1 according to the first embodiment of the present invention. The process of step A1 is performed by an operation of the user pressing the operation unit 4 or the like.

  In step A <b> 1, the CPU 10 determines whether or not to turn on the backlight 12 based on a command from the operation unit 4 and a program stored in the memory 11. If it is determined that the backlight 12 is to be turned on, the process proceeds to step A2, and if it is determined that the backlight 12 is not to be turned on, the process proceeds to step A3.

  In Step A2, the CPU 10 transmits a backlight lighting command to the backlight control unit 13, and the backlight control unit 13 that has received the lighting command turns on the backlight 12, and proceeds to Step A4. Here, the backlight 12 emits light based on a default value stored in the memory 11. The default value is set so that the brightness of the display unit 2 is high so that the characters displayed on the display unit 2 can be easily seen regardless of the surrounding brightness. In Step A3, the CPU 10 transmits a backlight turn-off command to the backlight control unit 13, and the backlight control unit 13 that has received the turn-off command turns off the backlight 12 and controls the backlight 12. finish.

  In step A4, the backlight control unit 13 determines whether a vertical synchronization signal output from the camera 3 has been received. If it is determined that the vertical synchronization signal is received, the process proceeds to step A5. If it is determined that the vertical synchronization signal is not received, the process returns to step A1. In step A5, the backlight control unit 13 measures the frame rate output from the camera 3, and proceeds to step A6.

  In step A6, the backlight control unit 13 determines whether or not the measured frame rate has been changed by a predetermined value or more as compared with the previously measured frame rate. Returning to step A5, if it is determined that the change has occurred, the process proceeds to step A7. Also, when there is no previously measured frame rate such as when the frame rate starts to be measured, it is compared with the default value. In Step A7, if it is determined that the change in the frame rate is a change that increases, the process proceeds to Step A8. If it is determined that the change in the frame rate is a change that decreases, the process proceeds to Step A9.

  In step A8, the light emission amount of the backlight 12 is increased, the luminance of the display unit 2 and the operation unit 4 is increased, and the process returns to step A4. Further, the light emission amount of the backlight 12 is set so as not to exceed a predetermined light emission amount. If the light emission amount of the backlight 12 is increased to be larger than the predetermined light emission amount, the light emission amount of the backlight 12 is set to the predetermined light emission amount, and the process returns to step A4. In step A9, the light emission amount of the backlight 12 is reduced, the luminance of the display unit 2 and the operation unit 4 is lowered, and the process returns to step A4.

  As described above, the mobile phone 1 is a mobile phone including the camera 3 that captures an image by changing the frame rate according to the ambient brightness, and is based on the frame rate output from the camera 3. The backlight 12 is controlled. Therefore, the mobile phone 1 can adjust the light emission amount of the light emitted from the backlight 12 based on the frame rate that changes in accordance with the shooting environment output from the camera 3 instead of the calculation result by the CPU 10. Therefore, the luminance of the display unit 2 and the operation unit 4 can be adjusted to an appropriate luminance according to the shooting environment without changing the configuration of the mobile phone and without applying a heavy load on the CPU 10.

  Further, the determination of the frame rate change in step A6 may be performed every predetermined time. For example, an average value of frame rates for a predetermined time may be calculated, and determination may be made using the calculated average value. By doing so, even if the frame rate changes, the amount of light emitted from the backlight 12 does not change for a predetermined time, so even if the frame rate changes frequently, the display unit 2 and the operation unit The luminance of 4 will not be frequent. That is, flickering of the display unit 2 and the operation unit 4 can be prevented. When the frame is switched, the luminance of the display unit 2 and the operation unit 4 may be adjusted by changing the light emission amount of the backlight 12. By doing so, the light emission amount of the light emitted from the backlight 12 is adjusted based on the frame rate immediately before the frame is switched, so that the light emission amount suitable for the frame output from the camera 3 can be adjusted. The brightness of the display unit 2 and the operation unit 4 can be adjusted to a more appropriate brightness.

  In addition, when it is determined that the measured frame rate is higher than the previously measured frame rate (the surrounding area has become brighter), the mobile phone 1 increases the brightness of the display unit 2 and the operation unit 4 and performs measurement. When it is determined that the measured frame rate is lower than the previously measured frame rate (the surrounding has become dark), the brightness of the display unit 2 and the operation unit 4 is set to be lowered. However, depending on the types of the display unit 2 and the operation unit 4, when it is determined that the surroundings are brightened, the display unit 2 and the operation unit 4 are reduced in luminance, and when the surroundings are determined to be dark, the display unit 2 and the operation unit 4 may be set to increase the luminance.

  In the present invention, the backlight 12 may be controlled so as to adjust the brightness of the display unit 2 and the operation unit 4 based on the frame rate from the camera 3. Rather than controlling the backlight 12 by comparing with the measured frame rate, the light emission amount of the backlight 12 corresponding to the measured frame rate is obtained by the backlight light emission amount table preset in the memory 11. As described above, the backlight 12 may be controlled. Hereinafter, the mobile phone 5 that is the second embodiment for controlling the backlight 12 using the backlight emission amount table will be described. The configuration of the mobile phone 5 is the same as that of the mobile phone 1 except that the backlight 11 is stored in the memory 11.

  In the backlight emission amount table, the emission amount of the backlight 12 is set such that the luminance of the display unit 2 and the operation unit 4 is appropriate luminance corresponding to a plurality of frame rates. An example of the backlight emission amount table is set as follows, for example. When the frame rate is less than 5 frames / second, the light emission amount is set to the maximum value. When the frame rate is 5 frames / second or more and less than 10 frames / second, the light emission amount is set to the default value, and the frame rate is In the case of 10 frames / second or more, the light emission amount is set to the minimum value. In the backlight light emission amount table, the light emission amount is set in three stages. However, the present invention is not limited to such a case, and may be set in any number of stages.

  FIG. 4 is a flowchart showing control of the backlight 12 of the mobile phone 5 according to the second embodiment of the present invention. The process of step B1 is performed by an operation of the user pressing the operation unit 4 or the like.

  In step B <b> 1, the CPU 10 determines whether to turn on the backlight 12 based on a command from the operation unit 4 and a program stored in the memory 11. If it is determined that the backlight 12 is to be turned on, the process proceeds to step B2, and if it is determined that the backlight 12 is not to be turned on, the process proceeds to step B3.

  In Step B2, the CPU 10 transmits a backlight lighting command to the backlight control unit 13, and the backlight control unit 13 that has received the lighting command turns on the backlight 12, and proceeds to Step B4. Here, the backlight 12 emits light based on a default value stored in the memory 11. The default value is set so that the brightness of the display unit 2 is high so that characters displayed on the display unit 2 can be easily seen regardless of the surrounding brightness. In Step B3, the CPU 10 transmits a backlight turn-off command to the backlight control unit 13, and the backlight control unit 13 that has received the turn-off command turns off the backlight 12 and controls the backlight 12. finish.

  In step B4, the backlight control unit 13 determines whether a vertical synchronization signal output from the camera 3 has been received. If it is determined that the vertical synchronization signal has been received, the process proceeds to step B5. If it is determined that the vertical synchronization signal has not been received, the process returns to step B1. In step B5, the backlight control unit 13 measures the frame rate output from the camera 3, and proceeds to step B6.

  In step B6, the backlight control unit 13 sets the light emission amount of the backlight 12 corresponding to the measured frame rate based on the backlight light emission amount table, and proceeds to step B7. In step B7, the backlight control unit 13 turns on the backlight 12 so that the light emission amount is set, and the process proceeds to step B8. In step B8, the backlight control unit 13 determines whether or not the measured frame rate has changed by a predetermined value or more as compared with the previously measured frame rate. Returning to step B8, if it is determined that it has changed, the process returns to step B5.

  As described above, the mobile phone 5 is a mobile phone including the camera 3 that captures an image by changing the frame rate according to the ambient brightness, and is based on the frame rate output from the camera 3. The backlight 12 is controlled. The backlight 12 is controlled by setting the light emission amount corresponding to the frame rate output from the camera 3 using the backlight light emission amount table stored in the memory 11. Therefore, the mobile phone 5 can adjust the light emission amount of the light emitted from the backlight 12 based on the frame rate that changes in accordance with the shooting environment output from the camera 3 instead of the calculation result by the CPU 10. Therefore, the luminance of the display unit 2 and the operation unit 4 can be adjusted to an appropriate luminance according to the shooting environment without changing the configuration of the mobile phone and without applying a heavy load on the CPU 10.

  Further, the frame rate change determination in step B8 may be performed at predetermined time intervals. For example, an average value of frame rates for a predetermined time may be calculated, and determination may be made using the calculated average value. By doing so, even if the frame rate changes, the amount of light emitted from the backlight 12 does not change for a predetermined time, so even if the frame rate changes frequently, the display unit 2 and the operation unit The luminance of 4 will not be frequent. That is, flickering of the display unit 2 and the operation unit 4 can be prevented. When the frame is switched, the luminance of the display unit 2 and the operation unit 4 may be adjusted by changing the light emission amount of the backlight 12. By doing so, the light emission amount of the light emitted from the backlight 12 is adjusted based on the frame rate immediately before the frame is switched, so that the light emission amount suitable for the frame output from the camera 3 can be adjusted. The brightness of the display unit 2 and the operation unit 4 can be adjusted to a more appropriate brightness.

  The above-described embodiment includes a display unit backlight and an operation unit backlight as the backlight 12, and controls both the display unit backlight and the operation unit backlight at the same time as the backlight 12. A mobile phone that performs control based on the above and adjusts the brightness of the display unit 2 and the operation unit 4 has been described as an example. In the present invention, only the backlight for the display unit is controlled based on the frame rate, and only the luminance of the display unit 2 may be adjusted, or only the backlight for the operation unit is controlled based on the frame rate, Only the luminance of the operation unit 4 may be adjusted.

  Furthermore, although the said embodiment demonstrated and demonstrated the mobile phone as an example, if this invention is a portable terminal device provided with the camera which changes a frame rate according to imaging | photography environment and image | photographs an image, for example, with a camera A PDA or the like may be used.

1 is a schematic diagram of a mobile phone 1 according to a first embodiment of the present invention. 1 is a block diagram showing an electrical configuration of a mobile phone 1 according to a first embodiment of the present invention. It is a flowchart which shows control of the backlight 12 of the mobile telephone 1 which is the 1st Embodiment of this invention. It is a flowchart which shows control of the backlight 12 of the mobile telephone 5 which is the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,5 Mobile phone 2 Display part 3 Camera 4 Operation part 10 CPU
DESCRIPTION OF SYMBOLS 11 Memory 12 Backlight 13 Backlight control part 14 Antenna 15 Communication control part 16 Receiver 17 Microphone 18 Voice control part

Claims (8)

Photographing means for photographing an image by changing the frame rate according to the photographing environment;
Display means for displaying an image photographed by the photographing means;
Illumination means for illuminating the display means;
A portable terminal device comprising: control means for controlling the illumination means based on the frame rate so as to adjust the luminance of the display means.   2. The portable terminal device according to claim 1, wherein the control unit adjusts the luminance of the display unit every predetermined time.   The portable terminal device according to claim 1, wherein the control unit adjusts the luminance of the display unit when a frame is switched. Provided with an operation unit illumination means for illuminating the operation unit,
The mobile terminal according to claim 1, wherein the control unit controls the operation unit illumination unit based on the frame rate so as to adjust a luminance of the operation unit. apparatus. A method for controlling illumination means of a mobile terminal device comprising imaging means,
Illumination means for illuminating the display means so as to adjust the luminance of the display means for displaying an image based on the frame rate output from the photographing means for photographing an image by changing the frame rate according to the photographing environment. The control method characterized by controlling.   6. The control method according to claim 5, wherein the brightness of the display means is adjusted every predetermined time.   7. A control method according to claim 5, wherein the brightness of the display means is adjusted when the frame is switched.   8. The control method according to claim 5, wherein an operation unit illumination unit that illuminates the operation unit is controlled so as to adjust a luminance of the operation unit based on the frame rate. 9. .

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