JP2009141584A - Mobile terminal device, back light control method, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device, back light control method, program and recording medium, with and by which, a sense of incompatibility that is incurred in a user associated with a required time before executing back light control when only an illuminance measurement result by a high-resolution measurement is used, can be eliminated. <P>SOLUTION: The mobile terminal device includes: a back light for illuminating a predetermined means; an illuminance measuring means for measuring illuminance around the device with a predetermined resolution; and a back light control means for controlling the back light using the result measured by the illuminance measuring means, wherein the illuminance measuring means measures the illuminance while switching a low-resolution measurement and a high-resolution measurement, and the back light control means controls the back light using the result of the illuminance measurement by the low-resolution measurement and the result of the illuminance measurement by the high-resolution measurement. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable terminal device, a backlight control method, a program, and a recording medium that control a backlight using measurement results of ambient illuminance.

  A portable terminal device (for example, a cellular phone) related to the present invention is disclosed in Patent Document 1 and Patent Document 2, for example. Such a portable terminal device includes a display unit that displays information and a display unit backlight that illuminates the display unit, and the illuminance around the device (hereinafter referred to as ambient illuminance) using an illuminance sensor or the like. The luminance of the display unit backlight is changed (hereinafter referred to as luminance control of the display unit backlight) in accordance with the measured ambient illuminance. Thereby, the brightness of the display unit backlight is optimized, and the power consumption is reduced. Further, such a portable terminal device includes an input unit operated by the user and an input unit backlight that illuminates the input unit, and the input unit backlight is turned on according to the ambient illuminance measured by the illuminance sensor. And turn-off control (hereinafter referred to as input portion backlight on / off control). Thereby, the lighting opportunity is suppressed and the power consumption is reduced.

  In the mobile terminal device described above, for example, when the ambient illuminance is bright, the luminance of the display unit backlight is increased and the input unit backlight is turned off. On the other hand, when the ambient illuminance is dark, the luminance of the display unit backlight is lowered and the input unit backlight is turned on.

  In the above-described portable terminal device, while reducing power consumption, in order to increase the visibility of the display unit, finer brightness control of the display unit backlight is performed according to the ambient illuminance. In order to perform finer brightness control of the display unit backlight, it is necessary to improve the measurement accuracy of the ambient illuminance. Therefore, the above-described portable terminal device has means for measuring ambient illuminance with high resolution.

  When the ambient illuminance is measured with high resolution (hereinafter, referred to as high resolution measurement), the measurement result is used not only for luminance control of the display unit backlight but also for lighting control of the input unit backlight. Here, the on / off control of the input unit backlight using the high resolution measurement will be described with reference to FIG.

When using high-resolution measurements, ambient illuminance with high accuracy can always be reflected. However, as shown in FIG. 5, at a point 301, the control unit recognizes that the input unit has been pressed (operated) until the control unit starts measuring the illuminance sensor. (For example, 200 ms) is required. Therefore, it takes time to turn on the input unit backlight.
JP 2003-60744 A JP 2006-229736 A

Therefore, the following problems occur in the mobile terminal device described above.
If you measure the ambient illuminance by high-resolution measurement and perform backlight control using only the measurement result, it takes a long time to perform the backlight control because high-resolution measurement requires a lot of time. Resulting in. For example, in the case where the input unit backlight is turned on / off, it takes time until the input unit backlight is turned on after the input unit is operated. Therefore, there is a possibility that the user may feel uncomfortable.

  The present invention has been made in view of the above circumstances, a portable terminal device that performs measurement of ambient illuminance by switching between low-resolution measurement and high-resolution measurement, and performs backlight control according to the measurement result. It is an object to provide a control method, a program, and a recording medium.

  In order to achieve such an object, a first portable terminal device of the present invention includes a backlight that illuminates predetermined means, an illuminance measuring means that measures illuminance around the apparatus with a predetermined resolution, and an illuminance measuring means. Backlight control means for controlling the backlight using the measurement result, the illuminance measurement means performs illuminance measurement by switching between low resolution measurement and high resolution measurement, and the backlight control means is low The backlight is controlled using the measurement result of the illuminance measurement by the resolution measurement and the measurement result of the illuminance measurement by the high resolution measurement.

  According to a second portable terminal device of the present invention, in the first portable terminal device of the present invention, the illuminance measuring means performs only the first illuminance measurement by low resolution measurement, and the high resolution measurement from the illuminance measurement after the first time. It is characterized by being performed by.

  According to a third portable terminal device of the present invention, in the first or second portable terminal device of the present invention, the backlight control means illuminates an input unit that receives information input as backlight control. At least one of control of turning on and off the light and control of luminance of a display portion backlight that illuminates a display portion that displays information is performed.

  According to a fourth mobile terminal device of the present invention, in the third mobile terminal device of the present invention, the backlight control unit compares the measurement result by the illuminance measurement unit with a predetermined threshold value, When the measurement result by the illuminance measurement means is equal to or greater than the threshold value, at least one of control for increasing the luminance of the display unit backlight and control for turning off the input unit backlight is performed. When the measurement result is smaller than the threshold value, at least one of control for lowering the luminance of the display portion backlight and control for turning on the input portion backlight is performed.

  The first backlight control method of the present invention is a backlight control method for measuring the illuminance around the device and controlling the backlight for illuminating a predetermined means using the measurement result of the illuminance measurement, Illuminance measurement is performed by switching between low resolution measurement and high resolution measurement, and backlight control is performed using the measurement result of illuminance measurement by low resolution measurement and the measurement result of illuminance measurement by high resolution measurement. .

  The second backlight control method of the present invention is the first backlight control method of the present invention, in which only the first illuminance measurement is performed by low resolution measurement, and the backlight is used by using the measurement result of illuminance measurement by low resolution measurement. This is characterized in that the first illuminance measurement after the first time is performed with high resolution measurement, and the backlight is controlled using the measurement result of the illuminance measurement by high resolution measurement.

  The third backlight control method of the present invention is the first or second backlight control method of the present invention. The backlight control is performed by turning on an input unit backlight that illuminates an input unit that receives input of information and It is at least one of control of turning off and control of luminance of a display unit backlight that illuminates a display unit that displays information.

  The fourth backlight control method of the present invention is the same as the third backlight control method of the present invention, in which the measurement result of the illuminance measurement is compared with a predetermined threshold value, the comparison result, the measurement result of the illuminance measurement. Is equal to or greater than the threshold, at least one of the control to increase the luminance of the display unit backlight and the control to turn off the input unit backlight is performed. As a result of comparison, the measurement result of the illuminance measurement is smaller than the threshold value. In this case, at least one of control for lowering the luminance of the display portion backlight and control for turning on the input portion backlight is performed.

  A first program of the present invention is obtained by an illuminance measurement process for measuring an illuminance around a device having a backlight that illuminates a predetermined means by switching between a low resolution measurement and a high resolution measurement, and an illuminance measurement process. The computer executes a backlight control process for controlling the backlight using the measurement result of the illuminance measurement by the low resolution measurement and the measurement result of the illuminance measurement by the high resolution measurement.

  The second program of the present invention is the first program of the present invention. In the illuminance measurement process, after performing only the first illuminance measurement with low resolution measurement, the illuminance measurement after the first illuminance measurement starts with high resolution. It is a process performed by measurement.

  According to a third program of the present invention, in the first or second program of the present invention, the backlight control process is a control process for turning on and off the input unit backlight that illuminates the input unit that receives input of information, and It is at least one of the luminance control processes of the display unit backlight for illuminating the display unit for displaying information.

  According to a fourth program of the present invention, in the third program of the present invention, the computer executes a comparison process for comparing the measurement result of the illuminance measurement with a predetermined threshold value. When the measurement result is equal to or greater than the threshold value, the backlight control process causes the computer to execute at least one of a control process for increasing the brightness of the display unit backlight and a control process for turning off the input unit backlight. If the measurement result of the illuminance measurement is smaller than the threshold value as a result of the comparison process, at least one of a control process for lowering the luminance of the display unit backlight and a control process for lighting the input unit backlight is performed as the backlight control process. One of them is executed by a computer.

  The recording medium of the present invention is recorded with any one of the first to fourth programs of the present invention.

  According to the present invention, the ambient illuminance measurement is performed by switching between the low resolution measurement and the high resolution measurement. Therefore, the backlight control time is controlled by using the measurement result of the low resolution measurement. Can be shortened, and the discomfort felt by the user can be eliminated. Further, by controlling the backlight using the measurement result of the high resolution measurement, the accuracy of the illuminance measurement can be improved, and the visibility and operability of the user can be improved.

  Hereinafter, a mobile phone as an embodiment of the mobile terminal device of the present invention will be described in detail with reference to the accompanying drawings.

  First, the configuration of a mobile phone as an embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration of a mobile phone according to the present embodiment.

  As shown in FIG. 1, the mobile phone according to this embodiment includes an illuminance sensor 101 that measures (senses) ambient illuminance, a display unit 102 that displays various types of information to the user, and receives input of various types of information from the user. An input unit 103; an input unit backlight 104 that illuminates the input unit 103; a reference illuminance storage unit 105 that stores reference illuminance for controlling turning on and off of the input unit backlight 104; And a control means 106 for controlling turning on and off of the input unit backlight 104.

  The illuminance sensor 101 measures (senses) the ambient illuminance of the mobile phone, and outputs information (illuminance information) indicating the measured ambient illuminance to the control unit 106. The illuminance sensor 101 can measure illuminance in a wide range from darkness to direct sunlight.

  The display unit 102 displays information such as characters input by the user from the input unit 103 and various types of information such as characters and images registered in the mobile phone.

  The input unit 103 receives various information input from the user.

  The reference illuminance storage unit 105 stores in advance a reference illuminance (threshold value) that serves as a determination reference when the input unit backlight 104 is turned on / off.

  The counter A measures a predetermined time. When the counter A is activated, it starts measuring a predetermined time, and stops when it reaches that time.

  The control unit 106 performs low resolution measurement and high resolution measurement based on the illuminance information acquired from the illuminance sensor 101 (illuminance measuring means). FIG. 2 is a diagram illustrating low-resolution measurement and high-resolution measurement of illuminance measurement performed by the mobile phone according to the present embodiment. The high-resolution measurement samples the illuminance information for a certain period acquired from the illuminance sensor 101, rejects various noises including 50Hz / 60Hz noise, and measures the result (illuminance measurement result) measured at 1 lux [lx] resolution. It is a measurement to output. The time required for this high resolution measurement is 200 ms. The low-resolution measurement is a measurement in which the sampling period of the illuminance information is shorter than that of the high-resolution measurement, and the measurement result (illuminance measurement result) is output at a resolution of 32 lux [lx]. The time required for this low resolution measurement is 5 ms. In the description here, the control unit 106 is configured to have the functions of low resolution measurement and high resolution measurement, but the illuminance sensor 101 may have functions of low resolution measurement and high resolution measurement. In this case, the control unit 106 instructs the illuminance sensor 106 to perform the low resolution measurement or the high resolution measurement, and the illuminance measurement measured from the illuminance sensor 106 by either the low resolution measurement or the high resolution measurement. Get the result.

  The control unit 106 compares the reference illuminance acquired from the reference illuminance storage unit 105 with the illuminance measurement result, and performs lighting on / off control of the input unit backlight 104 (backlight control unit). For example, when the value of the illuminance measurement result is equal to or greater than the reference illuminance value (when the ambient illuminance is bright), the input unit backlight 104 is turned off, and when the value of the illuminance measurement result is smaller than the reference illuminance value (the ambient illuminance is When it is dark), the input unit backlight 104 is turned on.

  Further, the control unit 106 confirms whether or not the input unit 103 is operated within a certain time measured by the counter A. If the operation of the input unit 103 is not detected within a certain time measured by the counter A, the control unit 106 turns off the input unit backlight 104.

  Next, the operation of the mobile phone of this embodiment will be described. 3 and 4 are diagrams illustrating the operation of the cellular phone according to the present embodiment (lighting on / off control of the input unit backlight).

  As indicated by point 401 in FIG. 3, when the input unit 103 is pressed by the user (step S500), the control unit 106 confirms the activation state of the counter A (step S501). When it is recognized that the counter A is activated (step S501 / YES), the activated counter A is reset and restarted (step S502). On the other hand, when it is recognized that the counter A is not activated (step S501 / NO), the counter A is activated (step S503).

  As indicated by a point 402 in FIG. 3, the control unit 106 performs low-resolution measurement based on the illuminance information of the illuminance sensor 101 (step S504). The control unit 106 acquires the illuminance measurement result of the low resolution measurement after 5 ms.

  The control unit 106 compares the acquired illuminance measurement result value with the reference illuminance value stored in advance in the reference illuminance storage unit 105 (step S505). When the illuminance measurement result is equal to or higher than the reference illuminance (step S505 / YES), the control unit 106 determines whether or not the input unit backlight 104 is currently lit (step S506). When the illuminance measurement result is smaller than the reference illuminance (step S505 / NO), the control unit 106 determines whether or not the input unit backlight 104 is currently lit (step S508).

  If it is determined in step S506 that the input unit backlight 104 is turned on (step S506 / YES), the control unit 106 turns off the input unit backlight 104 (step S507). If it is determined that the input unit backlight 104 is not turned on (step S506 / NO), the control unit 106 performs no processing.

  If it is determined in step S508 that the input unit backlight 104 is not turned on (step S508 / NO), the input unit backlight 104 is turned on (step S509). When it is determined that the input unit backlight 104 is turned on (step S508 / YES), the control unit 106 performs no processing.

  As described above, after the control unit 106 performs on / off control of the input unit backlight 104 based on the illuminance measurement result of the low resolution measurement, the process proceeds to step 510.

  The control unit 106 confirms the activation state of the counter A again (step S510). When the control unit 106 recognizes that the counter A is activated (step S510 / YES), the process proceeds to step S511. When the control unit 106 determines that the counter A is not activated (the counter A has stopped due to the elapse of a predetermined time) (step S510 / NO), the process proceeds to step S512.

  A case where the process proceeds to step S511 will be described. As indicated by a point 403 in FIG. 3, the control unit 106 performs high-resolution measurement based on the illuminance information of the illuminance sensor 101 (step S511). The control unit 106 acquires illuminance information after 200 ms, and acquires the illuminance measurement result of the high resolution measurement. The control unit 106 compares the value of the obtained illuminance measurement result with the value of the reference illuminance stored in advance in the reference illuminance storage unit 105, and controls the input backlight 104 to be turned on / off according to the comparison result. This is performed (steps S505 to S509). Note that the on / off control of the input backlight 104 based on the high-resolution measurement is performed until the counter A is stopped after a predetermined time has elapsed (step S510 / NO), as indicated by a point 404 in FIG.

  A case where the process proceeds to step S512 will be described. The control unit 106 determines whether or not the input unit backlight 104 is turned on (step S512). When it is determined that the input unit backlight 104 is turned on (step S512 / YES), the control unit 106 turns off the input unit backlight 104 (step S513), and the operation for turning on and off the input unit backlight 104 is performed. Is finished (step S514). If it is determined that the input unit backlight 104 is turned off (NO in step S512), the control unit 106 does not perform any processing and ends the operation of turning on / off the input unit backlight 104 (step S512). S514).

  Thereafter, this flow is controlled until a predetermined time or more elapses (counter A is stopped) after the input unit pressing is finally detected.

  Therefore, in the mobile phone according to the present embodiment, the illuminance immediately after the input unit 103 is pressed is measured by low-resolution measurement, and then the high-resolution measurement is performed, so that a quick response from pressing the input unit 103 to lighting the backlight is necessary. Backlight control is possible according to the situation and according to the illuminance measurement result with high accuracy thereafter.

According to the configuration and operation of the present embodiment described above, the following problems can be solved.
In general, when measuring ambient illuminance by high-resolution measurement and performing backlight control using only the measurement result, a large amount of time is required for high-resolution measurement. It takes time to turn on the backlight. For this reason, there is a possibility that the user may feel uncomfortable, but this embodiment can solve this problem.

  For example, when the response from when the input unit is operated to when the input unit backlight is turned on is advanced, a large amount of time is required for high-resolution measurement, and thus the measurement result cannot be used. For this reason, the on / off control of the input unit backlight according to the ambient illuminance cannot be performed, which hinders the reduction of power consumption. However, this embodiment can solve this problem.

  From the above, according to the present embodiment, by performing low-resolution measurement only for the first illuminance measurement and controlling the backlight using the measurement result, the time required for backlight control can be shortened, and the user The feeling of discomfort felt by can be eliminated. In addition, after the first illuminance measurement, high-resolution measurement is performed, and the backlight is controlled using the measurement result, thereby improving the accuracy of illuminance measurement and improving the visibility and operability for the user. be able to.

  In the description of the first embodiment, as an example of the backlight control performed using the illuminance measurement results of the low resolution measurement and the high resolution measurement, the on / off control of the input unit backlight has been described, but other than the input unit backlight In addition, it can be used for luminance control of the display portion backlight. In that case, the control unit performs the same operation as that shown in FIG. And a control part raises a display part backlight brightness | luminance, when an illuminance measurement result is more than reference | standard illuminance. On the other hand, when the illuminance measurement result is smaller than the reference illuminance, the display unit backlight luminance is lowered.

  Furthermore, as an example of the backlight control performed using the illuminance measurement results of the low resolution measurement and the high resolution measurement, the backlight control can be used for both the lighting on / off control of the input unit backlight and the luminance control of the display unit backlight. In that case, the control unit performs the same operation as that shown in FIG. And a control part raises the brightness | luminance of a display part backlight, and turns off an input part backlight, when an illumination intensity measurement result is more than reference | standard illumination intensity. On the other hand, when the illuminance measurement result is smaller than the reference illuminance, the luminance of the display unit backlight is lowered and the input unit backlight is turned on.

  As mentioned above, although embodiment of this invention was described, it is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the summary.

  For example, the control operation in the above-described embodiment can be executed by hardware, software, or a combined configuration of both.

  In addition, when executing processing by software, a program in which a processing sequence is recorded is installed in a memory in a computer incorporated in dedicated hardware and executed, or a general-purpose capable of executing various processing It is possible to install and execute a program on a computer.

  For example, the program can be recorded in advance on a hard disk or a ROM (ReAd Only Memory) as a recording medium.

  Alternatively, the program is temporarily stored on a removable recording medium such as a floppy (registered trademark) disk, a CD-ROM (Compact Disc ReAd Only Memory), a MO (Magnet optic Al) disk, a DVD (DigitAl VersAtile Disc), a magnetic disk, or a semiconductor memory. Or can be stored (recorded) permanently.

  Such a removable recording medium can be provided as so-called package software.

  The program is installed on the computer from the removable recording medium as described above, or wirelessly transferred from the download site to the computer, or wired to the computer via a network such as a LAN (LocAl Area Network) or the Internet. On the other hand, the computer can receive the transferred program and install it on a recording medium such as a built-in hard disk.

  In addition to being executed in time series in accordance with the processing operations described in the above embodiment, the processing capability of the apparatus that executes the processing, or to be executed in parallel or individually as necessary Is also possible.

  The present invention can be applied to a liquid crystal display device, a plasma display device, or the like that controls the backlight luminance of the display unit of the device according to ambient illuminance.

It is a block diagram which shows the structure of the portable terminal device of this invention. It is a table | surface which shows the performance difference of the low resolution measurement of the illumination intensity measurement in the portable terminal device of this invention, and a high resolution measurement. It is a figure which shows the input part backlight lighting-off control by the illumination intensity sensor of the portable terminal device of this invention. It is a flowchart which shows operation | movement of the portable terminal device of this invention. It is a figure which shows the input part backlight lighting-off control by the illumination intensity sensor of the portable terminal device relevant to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Illuminance sensor 102 Display part 103 Input part 104 Input part backlight 105 Reference | standard illumination storage means 106 Control part A Counter

Claims (13)

A backlight for illuminating a predetermined means;
Illuminance measuring means for measuring the illuminance around the apparatus with a predetermined resolution;
Backlight control means for controlling the backlight using the measurement result by the illuminance measurement means,
The illuminance measuring means includes
Perform the illuminance measurement by switching between low resolution measurement and high resolution measurement,
The backlight control means includes
A portable terminal device that controls the backlight using a measurement result of illuminance measurement by the low resolution measurement and a measurement result of illuminance measurement by the high resolution measurement. The illuminance measuring means includes
2. The portable terminal device according to claim 1, wherein only the first illuminance measurement is performed by the low resolution measurement, and the illuminance measurement after the first is performed by the high resolution measurement. The backlight control means includes
As the control of the backlight, at least among the control of turning on and off the input unit backlight that illuminates the input unit that receives input of information, and the control of the luminance of the display unit backlight that illuminates the display unit that displays information The portable terminal device according to claim 1, wherein one is performed. The backlight control means includes
Compare the measurement result by the illuminance measuring means with a predetermined threshold,
As a result of the comparison, if the measurement result by the illuminance measurement means is equal to or greater than the threshold value, at least one of control for increasing the luminance of the display unit backlight and control for turning off the input unit backlight is performed. Done
As a result of the comparison, if the measurement result by the illuminance measuring means is smaller than the threshold value, at least one of control for lowering the luminance of the display unit backlight and control for turning on the input unit backlight is performed. The portable terminal device according to claim 3. A backlight control method for measuring the illuminance around the device and using the measurement result of the illuminance measurement to control the backlight that illuminates a predetermined means,
The illuminance measurement is performed by switching between low resolution measurement and high resolution measurement, and the backlight is controlled using the measurement result of illuminance measurement by the low resolution measurement and the measurement result of illuminance measurement by the high resolution measurement. A backlight control method characterized by the above.   Only the first time of the illuminance measurement is performed by the low resolution measurement, the backlight is controlled using the measurement result of the illuminance measurement by the low resolution measurement, and the illuminance measurement after the first time is performed by the high resolution measurement. 6. The backlight control method according to claim 5, wherein the backlight is controlled using a measurement result of illuminance measurement by the high resolution measurement.   The control of the backlight includes at least the control of turning on and off the input unit backlight that illuminates the input unit that receives input of information, and the control of the luminance of the display unit backlight that illuminates the display unit that displays information. 7. The backlight control method according to claim 5, wherein the number is one. Compare the measurement result of the illuminance measurement with a predetermined threshold,
As a result of the comparison, if the measurement result of the illuminance measurement is equal to or greater than the threshold, at least one of control for increasing the luminance of the display unit backlight and control for turning off the input unit backlight is performed. ,
As a result of the comparison, if the measurement result of the illuminance measurement is smaller than the threshold value, at least one of control for lowering the luminance of the display unit backlight and control for turning on the input unit backlight is performed. The backlight control method according to claim 7. Illuminance measurement processing for measuring the illuminance around a device equipped with a backlight that illuminates a predetermined means by switching between low-resolution measurement and high-resolution measurement;
Using the measurement result of the illuminance measurement by the low resolution measurement and the measurement result of the illuminance measurement by the high resolution measurement obtained by the illuminance measurement process, a backlight control process for controlling the backlight;
A program that causes a computer to execute.   10. The illuminance measurement process is a process in which only the first illuminance measurement is performed by the low resolution measurement and then the illuminance measurement after the first illuminance measurement is performed by the high resolution measurement. The listed program.   The backlight control process includes a control process for turning on and off the input unit backlight that illuminates an input unit that receives input of information, and a brightness control process for a display unit backlight that illuminates a display unit that displays information. The program according to claim 9 or 10, wherein at least one of them. Causing the computer to perform a comparison process comparing the measurement result of the illuminance measurement with a predetermined threshold;
As a result of the comparison process, when the measurement result of the illuminance measurement is equal to or greater than the threshold value, the backlight control process increases the brightness of the display unit backlight, and the input unit backlight is turned off. Causing the computer to execute at least one of the control processes to be performed,
As a result of the comparison process, when the measurement result of the illuminance measurement is smaller than the threshold value, the backlight control process lowers the brightness of the display unit backlight, and the input unit backlight is turned on. 12. The program according to claim 11, which causes a computer to execute at least one of the control processes.   A recording medium on which the program according to any one of claims 9 to 12 is recorded.

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