JP4260640B2 - Mobile communication terminal - Google Patents

Description

  The present invention relates to a mobile communication terminal such as a mobile phone or a PDA (personal digital assistant) having a call function and a display function.

Many portable communication terminals typified by cellular phones have a receiving speaker arranged close to a display unit such as an LCD (liquid crystal display) from the viewpoint of ease of use and design.
For this reason, when a call is made, the user hears near the display unit, so that the abnormal sound generated on the display unit can be heard by the user, causing trouble in the call or giving the user uncomfortable feeling. the problem that you have been pronounced or.

  The lighting control method for a mobile phone described in Patent Document 1 is one of the conventional techniques for solving such problems. An EL (electroluminescence) light used as a backlight of an LCD display unit generates a minute audible sound when turned on, and causes the above-described abnormal noise. In the method of this document, whether or not the mobile phone is in a call state is detected by an optical sensor provided in the vicinity of the speaker unit, and when it is detected that the mobile phone is in a call state, illumination by the EL light is turned off. This prevents the user from hearing the difference that the EL light is generated.

  However, the backlight is not the only sound source in the LCD display. As the display unit is driven, an LCD panel, a capacitor, and the like also become sound sources. That is, the LCD panel generates sound by vibrating due to the influence of alternating current drive or high voltage drive, and the capacitor generates sound due to the influence of the piezoelectric effect. In recent years, LCD drive control has become more and more precise with the improvement of display accuracy, and these sounds generated with drive control cannot be ignored.

  In general, sound generated in a capacitor is dealt with by changing the material and type of a component.

  Further, for the vibration generated in the LCD panel, for example, a mechanical measure is taken as shown in FIG.

In the example of FIG. 5A, a threshold wall 104 is provided between the speaker 103 and the LCD panel 102 to prevent the sound caused by the panel vibration described above from leaking to the speaker.
In the example of FIG. 5B, a rubber cap 106 is laid around the opening 105 of the main body case 103 vacated for the LCD panel 102, and the LCD panel 102 is sandwiched between the rubber cap 106 and the main body case 103. Is installed. The rubber cap 106 acts as a buffer material to attenuate the vibration of the LCD panel 102 transmitted to the main body case 103.

JP 2000-328661 A

  However, the countermeasures by changing the parts as described above have a disadvantage that the freedom of selection of parts is limited, which may be disadvantageous in terms of cost.

  In addition, since portable communication terminals such as mobile phones are becoming smaller and thinner year by year, the above-described mechanical countermeasures are becoming difficult.

  The following may be cited as the cause of the mechanism that an abnormal sound is transmitted from the LCD panel to the speaker.

(1) It is not structured to suppress the vibration of the LCD panel. ;
(2) The LCD panel and the speaker are not cut off. ;
(3) The distance between the LCD panel and the trim plate (the acrylic plate of the display unit) is extremely narrow. ;

  Of these causes, (1) and (3) are the dominant causes of sound leakage. For this countermeasure, it is desirable to provide a buffer material as thick as possible between the LCD panel and the trim plate as shown in FIG. 5B, for example. However, since the device is thinned as described above, the buffer material has to be made thin in accordance with the device, and therefore, vibration of the LCD panel cannot be sufficiently suppressed. In other words, the presence of sound generated from the LCD panel is an obstacle to downsizing and thinning the device.

  The present invention has been made in view of such circumstances, and its object is to occur in a display means such as an LCD when using a receiving means such as a speaker without hindering downsizing and thinning of the device. An object of the present invention is to provide a mobile communication terminal that can prevent a user from hearing a sound to be heard.

The mobile communication terminal of the present invention that achieves the above object is
Display means for displaying information, display drive means for driving the display means, transmission means, reception means, wireless communication means, and control means,
The control means, when said receiving means is in use, said receiving means with respect to the case of non-use to control the display driving means to decrease the driving frequency of the display means, lowering the driving frequency of the display means At this time, the display driving unit is controlled to switch the display screen of the display unit from the first image to the second image which is a plain image .

  Preferably, the background colors of the first image and the second image are the same color or similar to each other.

Further, the control means may control the display driving means so as to switch the display image of the display means from the second image to the third image when the process of lowering the driving frequency of the display means is completed. good.
In this case, the background color of the second image and the third image, each other or the same color, or may be similar colors to each other.

  In addition, the present invention may have an audio signal output terminal to which a predetermined terminal can be attached, and in this case, the control means is configured to receive the incoming call when the predetermined terminal is attached to the audio signal output terminal. The output of sound from the means may be prohibited, and the process for reducing the drive frequency may not be performed.

  Furthermore, the control means may not perform the process of lowering the drive frequency when sound is output from the reception means in the sound expansion mode for increasing the volume.

  Further, the control means may perform a process of lowering the drive frequency when the receiving means is used for reproducing audio information received by the wireless communication means.

  In addition, the present invention may include storage means for storing at least audio information, and the control means is configured to use the above-described reception means when the reception means is used for reproducing the audio information stored in the storage means. Processing for lowering the drive frequency may be performed.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a user hears the sound which generate | occur | produces on a display means when using a receiving means, without inhibiting size reduction and thickness reduction of an apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a configuration of a mobile communication terminal according to an embodiment of the present invention.

  The mobile communication terminal shown in FIG. 1 includes a display unit 1, a display drive unit 2, a microphone 3, a reception speaker 4, a ringer speaker 5, an earphone terminal 6, a sound processing unit 7, and a wireless communication unit 8. A storage unit 9, an operation unit 10, and a control unit 11.

In the configuration described above, the display unit 1 is an embodiment of the display means of the present invention.
The display driving unit 2 is an embodiment of the display driving means of the present invention.
The microphone 3 is an embodiment of the transmission means of the present invention.
The receiving speaker 4 is an embodiment of the receiving means of the present invention.
The wireless communication unit 8 is an embodiment of the wireless communication means of the present invention.
The storage unit 9 is an embodiment of the storage means of the present invention.
The control unit 11 is an embodiment of the control means of the present invention.
The earphone terminal 6 is an embodiment of the audio signal output terminal of the present invention.

The display unit 1 is a unit that displays an image, such as an LCD or an EL display, and displays an image based on driving of the display driving unit 2.
The display unit 1 vibrates at an audible frequency according to the drive frequency (for example, 5 to 10 kHz) of the display drive unit 2 during the image display.

  The display driving unit 2 drives the display unit 1 to display an image thereon. For example, the image signal supplied from the control unit 10 is converted into a drive signal in a format suitable for driving the display unit 1 and supplied to the display unit 1.

  The microphone 3 converts the input sound into an electrical sound signal and outputs it to the sound processing unit 7. It is mainly used for inputting voice signals during transmission or voice recording.

  The reception speaker 4 and the linger speaker 5 convert the electrical audio signal input from the audio processing unit 7 into sound and output the sound.

The reception speaker 4 is a speaker that is assumed to be used with the user's ear close to the ear, and is mainly used for audio reproduction at the time of reception, voice recording, etc.
On the other hand, the linger speaker 5 is a speaker that is assumed to be used in a state in which the user removes his / her ears, and is mainly used for sound reproduction in a loudspeaker mode such as when a ring tone is generated or during a hands-free call. .

  The earphone terminal 6 is a terminal for outputting an audio signal to the earphone 12 having a predetermined terminal when the earphone 12 is attached.

  The audio processing unit 7 generates an analog audio signal corresponding to audio data in a predetermined format input from the control unit 7 and outputs the analog audio signal to the reception speaker 4, the ringer speaker 5, and the earphone terminal 6. The analog audio signal input from the microphone 3 is converted into audio data of a predetermined format and output to the control unit 7.

  Based on the control of the control unit 11, the wireless communication unit 8 performs processing for wirelessly transmitting and receiving various types of information such as voice and characters to and from a communication device (not shown).

  The storage unit 9 is a unit for storing various types of information used in the control unit 11, for example, a program used for the processing of the control unit 11, an address book, a call history, an incoming call history, and guidance during absence recording. Audio information such as audio is stored.

  The operation unit 10 is a unit for a user to input various information to the mobile communication terminal, and includes an information input device such as a push button switch or a dial.

The control unit 11 includes a computer that executes processing based on a program stored in the storage unit 9, and performs various processes related to the overall operation of the mobile communication terminal.
For example, the control unit 11 controls transmission / reception of the wireless communication 8 based on a predetermined communication protocol as processing related to communication such as voice communication and transmission / reception of electronic mail. In addition, as a process related to the user interface, a process of inputting / outputting voice data to / from the voice processing unit 7 when performing a voice call, and a display driving unit 2 so that various types of information are displayed on the display unit 1 are displayed. A process of controlling, a process of inputting information from the operation unit 10, and the like are performed.

  In addition, when the reception speaker 4 is in use (for example, a processing mode for performing a call using the reception speaker 4 or a process of reproducing voice information such as an absence recording stored in the storage unit 9 on the reception speaker 4. In the mode or the like, the display driving unit 2 is controlled so as to reduce the driving frequency of the display unit 1.

  That is, when the reception speaker 4 is in use, the control unit 11 reduces the drive frequency of the display unit 1 to a predetermined frequency at which noise generated by the vibration of the display unit 1 is reduced. Since the human audible frequency range is generally known to be 20 to 20 kHz, noise is reduced by, for example, reducing the drive frequency to a frequency lower than 20 Hz.

Furthermore, when changing the drive frequency of the display unit 1, the control unit 11 controls the display drive unit 2 to switch the display image on the display unit 1 to a predetermined image.
This predetermined image is for making the drawing disorder (see FIG. 3A described later) accompanying the change of the driving frequency inconspicuous, and for example, the entire screen is a plain screen of the same color. As an example, if the overall size of the screen is 120 × 160 dots, the control unit 11 sets all the pixels on this screen to the same color.

  Furthermore, the control unit 11 sets the background colors of the images before and after the switching to the same color or similar colors. Thereby, it is possible to make the display image switching inconspicuous.

  When the change of the drive frequency is completed, the control unit 11 displays the display unit 1 from an image (for example, a plain screen) that makes the above-described drawing disturbance inconspicuous, to another image (for example, an image indicating that a call is in progress). The display driving unit 2 is controlled so as to further switch images. Also in this case, the control unit 11 sets the background colors of the images before and after switching to the same color or similar colors.

  Here, the operation of the mobile communication terminal shown in FIG. 1 having the above-described configuration will be described with reference to the flowchart shown in FIG.

  When the process shifts from an arbitrary processing mode to a mode for making a voice call (step ST1), the process of the control unit 11 branches depending on whether this voice call is a call using the reception speaker 4 or not. (Step ST2).

  That is, in the case of a call using the reception speaker 4, the control unit 11 sets the internal speaker bus connected to the reception speaker 4 to ON so that the reception speaker 4 can output sound, and then the display unit 1 A plain screen is displayed (step ST3). The color of the plain screen is the same color as the background color of the image displayed before the plain screen or a similar color of the background color.

  Next, the control unit 11 reduces the drive frequency of the display unit 1 to, for example, 20 Hz or less (step ST4), and after the frequency change is completed, the control unit 11 proceeds to step ST5.

  On the other hand, when a call is made without using the receiving speaker 4 such as when an earphone is attached to the earphone terminal 6 or when a hands-free call is performed using the ringer speaker 5, the control unit 11 controls the earphone terminal 6 or After the internal speaker buses connected to the linger / speaker 5 are set to ON so that they can be output, the above-described steps ST3 and ST4 are omitted, and the process proceeds to step ST5.

  In step ST5, the control unit 11 causes the display unit 1 to display a predetermined image indicating that a call is in progress. The background color of this image is the same color as the color of the plain screen in step ST3 or a similar color of the color of the plain screen.

  Next, when an operation such as pressing a predetermined end button is performed on the operation unit 10 and the voice call is ended (step ST6), whether or not the voice call is a call using the reception speaker 4 is determined. Thus, the process of the control unit 11 branches (step ST7).

  That is, in the case of a call using the reception speaker 4, the control unit 11 turns off the internal speaker bus connected to the reception speaker 4, stops the sound output of the reception speaker 4, and then repeats the above-described plain operation. A screen is displayed on the display unit 1 (step ST8). The color of the plain screen is the same color as the background color of the image in step ST6 or a similar color of the background color.

  In the case of a mobile communication terminal having a function that allows the user to arbitrarily change the background color of a standby screen, a screen for calling a function, a screen for displaying the name of the other party when receiving a call, etc., for example, step ST6 Similarly, a plurality of types of images may be prepared, and at the time of the change, the control unit 11 may instruct the image of step ST6 to link images having the same background color or similar colors.

  Subsequently, the control part 11 returns the drive frequency of the display part 1 to the frequency (for example, 5k-10kHz) before the change of step ST4 (step ST9), and after this frequency change is completed, it transfers to step ST10.

  On the other hand, when a call is made without using the reception speaker 4, the control unit 11 sets the internal speaker bus connected to the earphone terminal 6 and the ringer speaker 5 used instead of the reception speaker 4 to OFF. After the audio output is stopped, the above-described steps ST8 and ST9 are omitted, and the process proceeds to step ST10.

  In step ST10, the control unit 11 causes the display unit 1 to display a predetermined image indicating the end of the call. The background color of this image is the same color as the color of the plain screen in step ST8 or a similar color of the color of the plain screen.

  Next, a specific example of an image displayed on the display unit 1 as the drive frequency is changed will be described with reference to FIGS.

FIG. 3 is a diagram illustrating an example of a screen change when the plain screen is not displayed during the change of the drive frequency.
FIG. 3A shows a screen before shifting to a call state. On the screen, characters “Shingo Aida” indicating the name of the other party and a number “01234567890” indicating the phone number are displayed.
FIG. 3B shows a display screen when the drive frequency is simply lowered while leaving the image of FIG. As shown in the figure, a disordered image extending in the vertical direction is instantaneously displayed on the display unit.
FIG. 3C shows a screen displayed after the change of the driving frequency is completed. In a state where the driving frequency is not fluctuated, an image without disturbance is displayed as in FIG. In the example of the figure, a character “call time” and a numerical symbol “00-01” indicating the value (00 minutes 01 seconds) are displayed on the screen.

On the other hand, when the plain screen is displayed during the change of the drive frequency according to the processing of the flowchart shown in FIG. 2 described above, an image as shown in FIG.
FIGS. 4A and 4B show the screens before and after the drive frequency change, which is the same as FIGS. 3A and 3C already described.
FIG. 4B shows a plain screen displayed during the change of the driving frequency. Since it is plain, a distorted image as shown in FIG. 3B is not displayed. Further, the color of the plain screen is kept the same as the background color of the images displayed before and after it or a similar color of the background color. For this reason, image disturbance or image switching as shown in FIG. 3 becomes inconspicuous.

  As described above, according to the mobile communication terminal according to the present embodiment, when the reception speaker 4 is in use, the harsh noise resulting from the vibration of the display unit 1 is reduced by lowering the drive frequency of the display unit 1. It is reduced. Therefore, since the problem of noise can be solved without relying only on the mechanical structure of the device, there is a disadvantage that the miniaturization and thinning of the device are hindered by the mechanical measures such as the conventional example shown in FIG. It can be avoided. In addition, since it is no longer necessary to rely solely on mechanical countermeasures as in the past, there are fewer restrictions on mechanical design, which makes it possible to simplify the mechanical design and further reduce the size and thickness of the equipment. Become.

  Further, when the drive frequency of the display unit 1 is lowered, the update speed of the image is lowered, which causes a problem that the display quality is deteriorated. However, according to the mobile communication terminal according to the present embodiment, the user becomes a mobile communication terminal. Since the drive frequency is lowered during use of the reception speaker 4 that is in the state of being touched, the user hardly sees the screen of the display unit 1. Therefore, the above-described problem of deterioration in display quality can be avoided while improving call quality by reducing noise. Further, since the drive frequency of the display unit 1 is restored to the original state except when the reception speaker 4 is used, the display quality other than during a call can be maintained as in the conventional case.

  Furthermore, when the drive frequency of the display unit 1 is changed, the image on the display unit 1 can be switched to an image that makes the drawing disturbance, such as a plain screen, inconspicuous, thereby reducing the user's uncomfortable feeling due to the drawing disturbance. be able to.

  In addition, since the background color of the image displayed when the drive frequency of the display unit 1 is changed and the background color of the image displayed before and after the image have the same color or colors similar to each other, The user's uncomfortable feeling due to the switching can be further reduced.

  In addition, embodiment mentioned above is an example and this invention is not limited to this.

  In the above-described embodiment, the drive frequency of the display unit 1 is lowered when the call mode using the reception speaker 4 is shifted. In addition to this, for example, voice information such as voice recording stored in the storage unit 9 is received. In various processing modes in which the reception speaker 4 is used, such as a mode for reproducing by the speaker 4, the drive frequency may be lowered in the same manner as the flowchart shown in FIG.

  The image displayed on the display unit 1 during the change of the driving frequency is not limited to the plain screen as described above. For example, various other images such as a pattern having a regular pattern may be used to make the drawing disturbance accompanying the change of the driving frequency inconspicuous.

  In the above-described embodiment, the speaker (ringer speaker 5) and the receiving speaker 4 used in the loudspeaking mode are provided independently, but the present invention is not limited to this. For example, when a loudspeaker mode for expanding the volume of the reception speaker 4 is provided and the reception speaker 4 is used instead of the ringer speaker 5, even when the process using the reception speaker 4 is in the loudspeaker mode, The drive frequency changing process may be prohibited. As a result, since it is not necessary for the user to bring the ear close to the mobile communication terminal (that is, the user can easily view the display unit 1), the drive frequency of the display unit 1 does not have to be lowered. Degradation can be prevented.

  In the above-described embodiment, the case where the reception speaker 4 of the mobile communication terminal is used and the case where the reception speaker 4 is not used are determined based on the processing mode of the control unit 1, but the present invention is not limited thereto. Not. For example, a detection unit (such as an optical sensor or a contact detection sensor) that detects an object approaching the reception unit may be provided, and the control unit may determine whether the reception unit is in use based on the detection result of the detection unit. good.

  In the above-described embodiment, the mobile communication terminal has been described as an example. However, the present invention is not limited to this. The mobile phone includes a speaker with a display unit with a high driving frequency, and the user uses the speaker close to his / her ear. Needless to say, the present invention can be applied to a personal handyphone system (PHS) terminal or a PDA having a communication function as long as it is a communication terminal.

  In the above-described embodiment, an example in which the processing of the control unit 11 is processed by a computer based on a program has been described. However, at least a part of these processing can be executed by hardware. Conversely, at least a part of the processing in units other than the control unit 11 may be executed by the computer of the control unit 11.

It is a figure which shows an example of a structure of the portable communication terminal which concerns on embodiment of this invention. 4 is a flowchart for explaining the operation of the mobile communication terminal shown in FIG. 1. It is a figure which shows an example of the screen change of a display part when not displaying a plain screen during the change of a drive frequency. It is a figure which shows an example of the screen change of a display part when a plain screen is displayed during the change of a drive frequency. It is the figure which illustrated an example of the conventional mechanistic countermeasure with respect to the vibration which arises in an LCD panel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Display part, 2 ... Display drive part, 3 ... Microphone, 4 ... Reception speaker, 5 ... Ringer speaker, 6 ... Earphone terminal, 7 ... Sound processing part, 8 ... Wireless communication part, 9 ... Memory | storage part, Operation part 11, control unit

Claims (8)

In a mobile communication terminal comprising a display means for displaying information, a display drive means for driving the display means, a transmission means, a reception means, a wireless communication means, and a control means,
The control means controls the display driving means so as to lower the drive frequency of the display means when the receiving means is in use, when the receiving means is not used ,
When the drive frequency of the display means is lowered, the display drive means is controlled to switch the display screen of the display means from a first image to a second image that is a plain image. . The background color of the first image and the second image, wherein the same or colors each other, or a similar color to each other, the mobile communication terminal according to claim 1. The control means controls the display drive means to switch the display image of the display means from the second image to the third image when the process of lowering the drive frequency of the display means is completed. The mobile communication terminal according to claim 1 or 2 . The background color of the second image and the third image, the portable communication terminal according to claim 3, wherein the same or colors each other, or a similar color to each other. Has an audio signal output terminal to which a predetermined terminal can be attached,
The control means, when the predetermined terminal is attached to the audio signal output terminal, prohibits the output of audio from the receiving means and does not perform the process of lowering the drive frequency. The mobile communication terminal according to any one of 1 to 4 . Said control means, when sound is output from the receiving means in the loudspeaker mode to expand the volume, characterized in that it does not perform the process of lowering the driving frequency, to any one of claims 1 to 5 The portable communication terminal as described. Said control means, when said receiving means for reproducing the audio information received in the wireless communication means is used, and performs a process of lowering the driving frequency, any one of claims 1 to 6 The mobile communication terminal according to 1. Having at least storage means for storing voice information;
The control unit according to any one of claims 1 to 7 , wherein the control unit performs a process of lowering the driving frequency when the reception unit is used to reproduce the audio information stored in the storage unit. The mobile communication terminal according to 1.

Images