JP2008294536A - Radio terminal device, and control method and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent communication quality from deteriorating when a receiving electric field level of a mobile terminal device is low. <P>SOLUTION: The mobile terminal device having an LCD display unit compares the receiving electric field level during communication with a threshold value, and displays 100% of data on the LCD display unit when the receiving electric field level is larger than the threshold or decreases the amount of data to be displayed on the LCD display unit otherwise. Thus, the amount of data transmitted to the LCD display unit is decreased to reduce self-generated noise, and even when the receiving electric field level is low, the communication quality is maintained. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless terminal device, its control method and program, and more particularly to a wireless terminal device having an LCD display device, its control method and program.

  In mobile phones, the signal level of a received electric field received from a base station is generally displayed on a display unit such as an LCD display device. However, the user cannot see the display of the notation part during the call of the mobile phone and cannot check the displayed signal level. Patent Document 1 describes a mobile phone that performs a call by setting the volume during a call to be lower as the measured received electric field level is lower when the transmission / reception antenna is in the accommodated state. The user can determine whether the received electric field level is high or low depending on the volume level. For example, the user can obtain a good received electric field level by pointing the mobile phone in a direction in which the volume increases.

  By the way, in the case of an incoming call with a weak electric field level or when the electric field level becomes low during a call, the mobile phone may not receive an incoming call due to the self-generated noise of the mobile phone, or the call will be disconnected. There was a case that happened. In the above-mentioned Patent Document 1, the lower the received electric field level, the lower the sound volume is adopted, so that this purpose is met, but the purpose itself is not conscious. Moreover, it cannot be said that the adoption of the above configuration alone is sufficient.

  In the mobile phone, a technique for preventing the above-described situation in which a call is disconnected due to self-generated noise has been proposed. Patent Document 2 describes a configuration in which a control unit pauses a part of a control operation unnecessary for a reception operation during a reception operation in a wireless device. In this technology, the signal level of the electric field received by the wireless unit is measured, and if the signal level is below the threshold value, a part of the power supply is stopped or the display by the display unit is stopped to The reception operation is prioritized by reducing generated noise.

JP 2003-115899 A JP 2001-332994 A

  In the wireless device described in Patent Literature 2, when the reception electric field level is low, display by the display unit is given as an example of an operation that should be restricted because it is unnecessary for the reception operation. However, in a mobile phone, the telephone number or name of the other party of the incoming call is displayed when an incoming call is received, so the display by the display unit is not an unnecessary function when receiving an incoming call. That is, if the display by the display unit is stopped when an incoming call is received, there is a problem in that necessary information cannot be obtained when the incoming call is received, which causes inconvenience to the user.

  The present invention can reduce the self-generated noise without impairing functions necessary for incoming calls, etc., and can therefore receive incoming calls even when the signal electric field level is low, and can prevent communication disconnection during a call. An object is to provide a terminal device.

In order to achieve the above object, a wireless terminal device of the present invention is a wireless terminal device including an LCD display device.
An electric field level detecting device for detecting an electric field level of a radio signal to be received;
And a control unit that controls the LCD display device so as to reduce the amount of display data input to the LCD display device when the detected electric field level is equal to or less than a predetermined threshold value.

The wireless terminal device control method of the present invention is a wireless terminal device control method comprising an LCD display device.
Detecting an electric field level of a radio signal to be received;
And a step of controlling the LCD display device by reducing the amount of display data input to the LCD display device when the detected electric field level is not more than a predetermined threshold value.

Furthermore, the program of the present invention is a program for a computer that controls a wireless terminal device including an LCD display device, and the computer includes
Detecting an electric field level of a radio signal to be received;
When the detected electric field level is equal to or lower than a predetermined threshold value, the display data amount input to the LCD display device is reduced, and the step of controlling the LCD display device is executed.

  In the wireless terminal device, the wireless terminal device control method, and the program according to the present invention, when the received electric field level is lower than a predetermined threshold value, the amount of display data input to the LCD display device is reduced. Even when the electric field level of the radio signal is low, it is possible to prevent an incoming call from being lost or a communication disconnection during a call.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external view showing a mobile phone which is a mobile terminal device according to an embodiment of the present invention. The mobile phone 10 is a foldable mobile phone, and includes an LCD display unit (LCD display device) 11 and an antenna 12 on an upper housing, a keyboard on the lower housing, and a battery 13 inside. .

  FIG. 2 is a functional block diagram showing the internal configuration of the mobile phone 10 of FIG. The mobile phone 10 includes an LCD display unit 11 for displaying various data, a control unit 21 for controlling the operation of each unit, a memory 22 for storing data to be displayed on the LCD and other various data, an antenna 12 for transmission / reception, an internal unit (not shown) A wireless unit 23 that exchanges data with the circuit and the antenna 12 and a battery 13 that supplies power to each unit are provided.

  The LCD display unit 11 is necessary to convey various information to the user. However, when the electric field strength of the signal received from the base station is low, the noise component generated by transmitting the display data to the LCD display unit 11 suppresses the RF component of the wireless unit 23, and the mobile phone 10 receives the signal. Sensitivity may deteriorate. At this time, the intensity at which the RF component is suppressed varies depending on the amount of data transmitted to the LCD display unit 11. In general, the greater the amount of data, the greater the intensity of suppression. When the reception electric field level is low, the electric field level of the RF signal is disturbed by data transmitted to the LCD display unit 11, and in some cases, the mobile phone may be disconnected from the network.

  For this reason, in this embodiment, the reception electric field level received by the mobile phone 10 is detected by the radio unit 23, and the control unit 21 compares the electric field level with a threshold value. When the received electric field level is lower than the threshold value, the control unit 21 limits the amount of data displayed on the LCD display unit 11 to a predetermined value or less. As a result, network disconnection unintended by the user can be avoided. In general, the larger the display area of the display area of the LCD display unit, the larger the amount of data transmitted. Therefore, limiting the display area leads to a reduction in the data amount. Hereinafter, a method for limiting the amount of data transmitted to the LCD display unit will be described with an example.

  First, an example of a method for reducing the amount of data displayed on the LCD display unit 11 will be described with reference to FIG. In the example of FIG. 3, in the normal state, display is performed on the entire display area 31 (100%) of the LCD display unit 11 as shown in FIG. When the amount of data is reduced, the data is displayed only in 20% of the display area 31 as shown in FIG. FIG. 2B shows an example in which data is displayed only in a partial area 32 that is 20% of the entire display area 31, in this example, only in the central partial area 32. Data is not displayed in the other area 33, that is, the upper and lower areas 33 constituting 80% of the display area 31. In this example, important data to be displayed at the time of an incoming call is set to be displayed in advance in the central area of the LCD display unit 11. In addition, this area can be enlarged and displayed, for example, about 1.5 to 3 times according to the display content of the image data to be displayed.

  In the example of FIG. 4, the display area 31 shown in FIG. 4A is divided into a plurality of group areas 41. As shown in FIG. 4B, one group region 41 includes, for example, vertical and horizontal 20 × 20 pixels 42. As shown in FIG. 6C, thinning display is performed in each group region 41 so that data is displayed with, for example, 80% of the pixels 43 and no data is displayed with the remaining 20% of the pixels 44. That is, the area where data is not displayed is made uniform over the entire screen. If the amount of data is limited in this way, all data can be generally displayed, although the resolution is somewhat reduced.

  3 and 4 can be executed in combination. For example, when the threshold value to be compared with the received electric field level is a plurality of stages and the signal level is considerably low and the data amount needs to be significantly reduced, the limiting method of FIG. 3 is adopted and the signal level is an intermediate value. When the data amount can be reduced by a small amount, the limiting method shown in FIG. 4 may be adopted. In each of FIGS. 3 and 4, the size of the area for displaying data corresponding to a plurality of threshold values and the ratio of the pixels for displaying data may be set in a plurality of stages.

  FIG. 5 is a flowchart showing processing at the time of an incoming call in the mobile phone. While the mobile phone 10 is on standby (step S11), the LCD display unit 11 displays an image stored in the memory 22 as a standby screen. When there is an incoming call (step S12), the radio unit 23 detects the received electric field level (step S13). The control unit 21 compares the detected received electric field level with a threshold value for determination (step S14). If it is determined in step S14 that the received electric field level is lower than the determination threshold value, the control unit 21 displays the LCD display unit 11 with the limited data amount (step S15). Next, call processing is started (step S16). If it is determined in step S14 that the received electric field level exceeds the determination threshold value, the process proceeds to step S16 as it is, and the call process is started.

  In the restriction process at the time of the incoming call, for example, an image restricted by the method shown in FIG. 3 or 4 is displayed. For this reason, the user does not extremely impair the visibility of the image displayed when an incoming call is received.

  By adopting the above incoming processing, the noise component generated can be reduced by reducing the data transmitted to the LCD display section even when an incoming call is received at a weak electric field level, so that suppression of the received wave due to self-generated noise is prevented. For this reason, it is possible to prevent the received wave from dropping below the threshold value for call connection determination, and avoid the problem of not leading to call processing. In addition, regarding the limitation of the data amount of the LCD display unit, the data amount of the LCD display unit is limited in a situation where the limitation is truly necessary and the minimum necessary information can be recognized. It is possible to limit the amount of data without impairing the original function of.

  FIG. 6 is a flowchart showing processing during a call of the mobile phone according to the embodiment. When the mobile phone is talking in a normal state (step S21), the LCD display unit 11 sets the image stored in the memory 22 as the screen during the call. The radio unit 23 monitors the received electric field level input from the antenna 12 (step S22). The control unit 21 acquires the received electric field level during a call, and determines whether the electric field level is above or below a set threshold value (step S23).

  If the received electric field level exceeds the threshold value, the process proceeds to step S25, and 100% image data that does not limit the data amount is sent to the LCD display unit 11 for display. On the other hand, when the value is below the threshold value, an image with a limited data amount is displayed on the LCD display unit 11 (step S24). Since the limited image data is realized by the method shown in FIG. 3 or FIG. 4, the visibility of the image data during the call operation by the user is not significantly impaired. The LCD display unit 11 displays the data input from the control unit 21 (steps S24 and S25), returns to step S22, continues to monitor the received electric field level, and repeats the processes of steps S22 to S25.

  In the processing during the call of the mobile phone, when the received electric field level fluctuates during the call and approaches the threshold for disconnecting the call, the amount of data for the LCD display unit is limited, and the generated noise is reduced. Reduce. Therefore, it is possible to prevent the reception wave level from being lower than the threshold value for call connection determination due to the suppression of the reception wave during the call in the weak electric field due to the transmission of the display data to the LCD display unit. That is, it is possible to avoid a situation in which the reception wave is suppressed by the self-generated noise of the mobile phone and the call is disconnected. In addition, regarding the display limitation of the LCD display unit, the original function of the LCD display unit is performed by limiting the LCD display within a range in which information can be recognized by performing the limitation in a situation where the limitation is truly necessary. The amount of data can be limited without impairing data.

  The restriction on the amount of data in the cellular phone of the present invention can be applied not only during voice communication but also during data communication.

  Moreover, although the example with one threshold value was given in the said flowchart, there may be two or more threshold values. In this case, according to the level of the received electric field, for example, the display pixel 43 in FIG. 4 is limited in stages such as 100%, 90%, and 80% of the pixel group.

  Although the present invention has been described based on the preferred embodiments, the mobile terminal device, the control method, and the program of the present invention are not limited to the configurations of the above embodiments, and the configurations of the above embodiments. To which various modifications and changes are made within the scope of the present invention.

The portable terminal device of one Example of this invention. The functional block diagram of the portable terminal device of FIG. It is a figure which shows an example of the display restriction | limiting of a LCD display part, (a) shows 100% display, (b) shows 20% display. 4A and 4B are diagrams showing another example of display restrictions on the LCD display unit, where FIG. 5A shows the entire display area, FIG. 5B shows a pixel configuration of a part of the block, and FIG. 5C shows a pixel table in each block. Each example is shown. The flowchart which shows the process at the time of the incoming call in the portable terminal device of FIG. The flowchart which shows the process at the time of the telephone call in the portable terminal device of FIG.

Explanation of symbols

10: Mobile terminal device (mobile phone)
11: LCD display unit 12: Antenna 13: Battery 21: Control unit 22: Memory 23: Wireless unit

Claims (7)

In a wireless terminal device comprising an LCD display device,
An electric field level detecting device for detecting an electric field level of a radio signal to be received;
A wireless terminal device comprising: a control unit that controls the LCD display device so as to reduce the amount of display data input to the LCD display device when the detected electric field level is equal to or less than a predetermined threshold value.   When the amount of display data is reduced, the control unit inputs only display data of a partial area of the LCD display device to the LCD display device, and displays the area displayed on the LCD display device by limiting the display area to the partial area. The wireless terminal device according to claim 1.   When the amount of display data is reduced, the control unit inputs only display data of a partial area of the LCD display device to the LCD display device, and enlarges the region where the input display data is to be displayed on the LCD display device. The wireless terminal device according to claim 1, wherein the wireless terminal device is displayed as follows.   The control unit divides the display area of the LCD display device into a pixel group including a plurality of pixels when the display data amount is reduced, and transmits data of some of the pixels in the pixel group. The wireless terminal device according to claim 1, wherein display data is displayed with the pixels.   The wireless terminal device according to claim 1, wherein the threshold value includes a plurality of threshold values, and the control unit limits the display area in a plurality of stages. In a control method of a wireless terminal device including an LCD display device,
Detecting an electric field level of a radio signal to be received;
And a step of controlling the LCD display device by reducing the amount of display data input to the LCD display device when the detected electric field level is not more than a predetermined threshold value. A program for a computer that controls a wireless terminal device including an LCD display device, the computer comprising:
Detecting an electric field level of a radio signal to be received;
And a step of controlling the LCD display device by reducing the amount of display data input to the LCD display device when the detected electric field level is not more than a predetermined threshold value.

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