Patent Publication Number: US-2021161468-A1

Title: Electronic device, method and storage medium

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of Japanese Patent Application No. 2019-216389, filed on Nov. 29, 2019, the entire disclosure of which is incorporated by reference herein. 
     FIELD 
     This application relates generally to an electronic device which measures and displays biological information of a user such as a pulse rate, a method, and a storage medium. 
     BACKGROUND 
     For example, Unexamined Japanese Patent Application Publication No. 2018-007887 discloses an electronic device which is worn on a wrist, and measures and displays the pulse rate. 
     SUMMARY 
     The present embodiment is an electronic device including: 
     a biological information acquirer that acquires biological information of a target; 
     an error factor detector that detects a factor that cases an error in the biological information; 
     a display; and 
     at least one processor, wherein 
     the error factor detector includes a motion detection sensor that detects a direction of motion of the electronic device, and 
     the processor 
     determines whether the factor is detected, based on the direction of the motion of the electronic device; and 
     causes, when the processor determines that the factor is detected, the display not to display the biological information acquired by the biological information acquirer, or cause the biological information acquirer to stop acquisition of the biological information, in a first period determined based on a timing when the factor is detected, and 
     causes, when the processor determines that the factor is not detected, the display to display the biological information acquired by the biological information acquirer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A more complete understanding of this application can be obtained when the following detailed description is considered in conjunction with the following drawings, in which: 
         FIG. 1A  is a view illustrating a front surface of an electronic device according to Embodiment 1, and  FIG. 1B  is a view illustrating a back surface of the electronic device according to Embodiment 1; 
         FIG. 2  is a circuit block diagram of the electronic device according to Embodiment 1; 
         FIG. 3  is a view illustrating an example of a variation of a pulse rate which is measured in the electronic device according to Embodiment 1; 
         FIG. 4A  and  FIG. 4B  are views illustrating examples of display of a pulse rate at a time when an error occurs in the electronic device according to Embodiment 1; 
         FIG. 5  is a flowchart illustrating a flow of a display control process which is executed by the electronic device according to Embodiment 1; and 
         FIG. 6  is a flowchart illustrating a flow of a display control process for operation time, which is executed by an electronic device according to Embodiment 2. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, the present embodiments will be described in detail with reference to the accompanying drawings. Note that identical or corresponding parts in the drawings are denoted by identical reference signs. 
     Embodiment 1 
     An electronic device  100  according to Embodiment 1 is a so-called wearable terminal, and is a device which can display time and date, a pulse rate of a user who wears the electronic device  100 , and the like. Hereinafter, a description will be given by taking a pulse rate as an example of biological information of the user.  FIG. 1A  illustrates a front surface of the electronic device  100 , the front surface being a surface which the user views when the electronic device  100  is worn. The electronic device  100  includes a display  10  which displays time and date, a pulse rate, and the like; a rotary bezel  11  which is rotatable; a crown  12  for adjusting time; push buttons  13  and  14  for various settings; and a belt  15  for attaching the electronic device  100  to the user. The display  10  includes a display device  10   a  and a touch panel  10   b  functioning as an operation inputter. Note that the user who wears the electronic device  100  is an example of a target in the patent claims. 
     In Embodiment 1, as illustrated in  FIG. 1A , it is assumed that the display  10  displays the present time and date and the pulse rate. Note that one of the present time and date and the pulse rate may be displayed, and the displayed screen may be switched by an operation from the push buttons  13 ,  14 , touch panel  10   b,  or the like. In addition, a screen displaying both the present time and date and the pulse rate and a screen displaying one of the present time and date and the pulse rate may be switched by an operation from the push button  13 ,  14 , touch panel  10   b,  or the like. 
       FIG. 1B  illustrates a back surface of the electronic device  100 , the back surface being a surface which is put in contact with the user when the electronic device  100  is worn. The back surface of the electronic device  100  includes a back-surface cover  17 , a glass window  18  which transmits light, and a pulse sensor  19 . The pulse sensor  19  includes a light transmitter  19   a  and a plurality of light receivers  19   b.  Light emitted from the light emitter  19   a  of the pulse sensor  19  passes through the glass window  18 , and is radiated on the wrist, upper arm or the like of the user who wears the electronic device  100 . The radiated light is reflected by a blood vessel, made incident on the glass window  18 , and received by the light receivers  19   b.    
     Blood includes oxyhemoglobin with such properties as to absorb light. When the light emitted from the light emitter  19   a  is radiated on the blood vessel, part of the light is absorbed in the blood. Thus, the light quantity of reflective light from the blood vessel varies in accordance with a blood flow rate which varies in accordance with the pulsation of the heart. Hence, the pulse of the user can be detected by receiving the reflective light from the blood vessel by the light receivers  19   b.    
     In addition, the electronic device  100  includes therein a motion detection sensor  20  which detects motion of the user wearing the electronic device  100 ; a storage  21  which stores various data, programs, and the like; a clock  22  which measures time; and a controller  25  which controls various functions that are executed by the electronic device  100 . 
     Next, circuit blocks of the electronic device  100  will be described. As illustrated in  FIG. 2 , the electronic device  100  includes the pulse sensor  19  which detects the pulse data of the user; the motion detection sensor  20  which detects acceleration and a direction of motion; an operator  23  which accepts an operation from the user; the storage  21  which stores various data and programs; the clock  22  which measures time; the display  10  which effects display by display control from the controller  25 ; and the controller  25 . 
     The light emitter  19   a  of the pulse sensor  19  can be constituted by a light emitting diode (LED) which can radiate light such as infrared, red light, or the like. In addition, the light receivers  19   b  can be constituted by using, for example, light receiving elements such as photodiodes, phototransistors, or the like. The motion detection sensor  20  can judge the motion of an action of the user who wears the electronic device  100 , based on the detected acceleration and the direction of movement of the electronic device  100 . The motion detection sensor  20  can be constituted by, for example, a gyro sensor, an acceleration sensor, or the like. 
     The operator  23  is a function of accepting an operation from the user. Hereinafter, the rotary bezel  11 , crown  12 , push buttons  13  and  14 , and touch panel  10   b  are comprehensively referred to as the operator  23 . The storage  21  is a memory device which stores various data, programs, and the like, and can be constituted by, for example, a nonvolatile memory element such as a read-only memory (ROM), a flash memory, or the like. 
     The clock  22  measures time, for example, by using a reference signal by an oscillation signal of a quartz oscillator or the like. The time measured by the clock  22  is displayed on the display  10  illustrated in  FIG. 1A . The display  10  includes a display device  10   a  and a touch panel  10   b  that is an operation inputter. The display device  10   a  is a display device such as a liquid crystal display (LCD), a plasma display panel (PDP), an organic electro-luminescence (EL) display device, or the like, and the display device  10   a  displays various images, characters, signs and the like according to control by the controller  25  (to be described later). The touch panel  10   b  is a touch panel of a resistive type, a capacitive type or the like, which detects a position touched by the user and outputs the detected position to the controller  25  (to be described later). 
     The controller  25  controls various functions which are executed by the electronic device  100 . The controller  25  includes a central processing unit (CPU) which executes programs stored in the storage  21 , a random-access memory (RAM) for reading in the programs stored in the storage  21 , an interface for acquiring various data from the pulse sensor  19 , the motion detection sensor  20  and the operator  23 , and a graphic processing unit (GPU) for display control. 
     By executing the programs stored in the storage  21 , the controller  25  functions as a pulse data acquirer  251  which acquires pulse data of the user; a motion information acquirer  252  which acquires information relating to the motion of the user; an operation information acquirer  253  which acquires information relating to an operation from the user; a determiner  254 ; and a display controller  255  which controls display of the display  10 . 
     The pulse data acquirer  251  acquires the pulse data of the user wearing the electronic device  100  from the pulse sensor  19 , and calculates a pulse rate from the acquired pulse data of the user. The motion information acquirer  252  acquires data of acceleration and data of a direction of motion of the electronic device  100  from the motion detection sensor  20 . The operation information acquirer  253  acquires data relating to an operation from the user, which is detected by the operator  23 . Based on the pulse rate calculated by the pulse data acquirer  251 , and the data acquired by the motion information acquirer  252  and operation information acquirer  253 , the determiner  254  determines whether or not to display the pulse rate, which is calculated from the pulse data acquired by the pulse data acquirer  251 , as such on the display  10 , as the pulse rate that is to be displayed on the display  10 . The determination in the determiner  254  will be described later in detail. The display controller  255  generates display data that is to be displayed on the display  10 , in accordance with the determination result of the determiner  254 , and causes the display  10  to display the display data. Note that the determiner  254  is an example of determination means in the patent claims. In addition, the display controller  255  is an example of a display controller in the patent claims. Besides, the user is an example of a target in the patent claims. 
     In the electronic device  100 , as described above, the pulse of the user wearing the electronic device  100  is detected by the pulse sensor  19 , and the pulse rate calculated from the detected pulse data can be displayed on the display  10 . In the pulse sensor  19 , the light emitted from the light emitter  19   a  is radiated on the blood vessel of the user, and reflective light from the blood vessel is received by the light receivers  19   b.  The reflective light from the blood vessel, which is received by the light receivers  19   b,  varies in accordance with the blood flow of the user. 
     For example, as illustrated in  FIG. 3 , when the user wearing the electronic device  100  is running, no great variation occurs in the value of the pulse data detected by the pulse sensor  19  during a period from time T 0  to time T 1 . Thus, during the period from time T 1  to time T 1 , the pulse rate that is displayed on the display  10  of the electronic device  100  is substantially constant. In addition, as illustrated in  FIG. 3 , during the period from time T 0  to time T 1  in which the user is running, the value of the pulse data detected by the motion detection sensor  20  is a value that does not greatly vary. 
     Then, at time T 1 , for example, it is assumed that the user twists the arm in order to confirm the present time, and moves the electronic device  100  to the front of the eyes. In this case, since the amount of blood flowing in the blood vessel greatly varies in accordance with the twist of the arm, the value detected by the pulse sensor  19  becomes greater than the value detected before, as indicated by a waveform A in  FIG. 3 . Thereafter, if the state in which the arm is twisted continues, since the amount of blood flowing in the blood vessel does not greatly vary, the value of the pulse data detected by the pulse sensor  19  becomes closer to the value at the time before time T 1  at which the arm was twisted. 
     In addition, at time T 1 , immediately after the user twists the arm, the value of data of acceleration, which is detected by the motion detection sensor  20 , becomes a greater value than while the user is running, as indicated by a waveform a. Then, if the user does not move, the value of data of acceleration, which is detected by the motion detection sensor  20 , becomes equal to the value detected while the user is running. Subsequently, when the user further moves the arm, for example, by moving the display  10  of the electronic device  100  to an easier-to-view position, the motion detection sensor  20  detects data of acceleration, which has a greater value than while the user is running, as indicated by a waveform b. 
     Thereafter, at time T 2 , for example, it is assumed that the user ends the confirmation of the present time, and restores the arm to the position before twisting the arm, that is, to the position while the user is running. In this case, the amount of blood flowing in the blood vessel greatly varies in accordance with the motion of restoring the arm. Thus, the value of the pulse data detected by the pulse sensor  19  becomes greater than the value detected before, as indicated by a waveform B in  FIG. 3 . Thereafter, if the state in which the arm is restored continues, the amount of blood flowing in the blood vessel does not greatly vary. Thus, the value of the pulse data detected by the pulse sensor  19  becomes closer to the value at the time before time T 1  at which the arm was twisted. After time T 3 , if the user does not move the arm, such as by twisting and restoring the arm, no great variation occurs in the value of pulse data detected by the pulse sensor  19 . 
     In addition, when the user ends the confirmation of the present time and restores the arm to the position before twisting the arm, that is, to the position while the user is running, the motion detection sensor  20  detects the value of data of acceleration, which has a greater value than while the user is running, as indicated by a waveform c. Then, if no motion occurs, the value of data of acceleration, which is detected by the motion detection sensor  20 , becomes equal to the value detected while the user is running. After time T 3 , if the user does not move the arm, such as by twisting and restoring the arm, no great variation occurs in the value of data of acceleration detected by the motion detection sensor  20 . Note that the direction of motion of the electronic device  100 , which is detected by the motion detection sensor  20  when the arm is twisted at time T 1 , is opposite to the direction of motion of the electronic device  100 , which is detected by the motion detection sensor  20  when the arm is restored at time T 2 . 
     In this manner, when the user twists the arm and then restores the arm, the value detected by the pulse sensor  19  greatly varies only immediately after the motion of twisting the arm and the motion of restoring the arm. The value of pulse data detected by the pulse sensor  19  in this case is not a value which is to be normally detected, but a value including an error occurring in accordance with the motion. When the pulse rate generated based on the pulse data including the error is displayed on the display  10  of the electronic device  100 , the user will view the pulse rate including the error. 
     However, as described above, if the amount of blood flowing in the blood vessel does not greatly vary in the state in which the arm is twisted and in the state in which the arm is restored, the pulse data detected by the pulse sensor  19  becomes substantially equal to the value immediately before the motion of twisting the arm and the motion of restoring the arm. The value of pulse data detected by the pulse sensor  19  in this case is a value which is to be normally detected, and a value including no error which occurs in accordance with the motion. Thus, there is a possibility that, shortly after the user views the pulse rate including an error on the screen of the display  10 , the user views the pulse rate including no error. It is thus possible that the user doubts whether the displayed pulse rate is correct or not. 
     When the pulse data detected by the pulse sensor  19  includes an error, the motion detection sensor  20  also detects data of acceleration having a greater value than while the user is running, as described above. Specifically, the motion detection sensor  20  can detect data of acceleration, which is a factor of the error included in the pulse data. Thus, in Embodiment 1, when a pulse rate calculated from pulse data detected by the pulse sensor  19  is equal to or greater than a threshold, an acceleration by motion of a user and a direction of the motion are detected by the motion detection sensor  20 , and when the determiner  254  of the controller  25  illustrated in  FIG. 2  determines that a motion that is an error factor is performed, based on the detected acceleration, a pulse rate including no error is displayed in place of a pulse rate including an error. Hereinafter, the pulse rate including no error, which is displayed in place of the pulse rate including an error, is referred to as “dummy pulse rate”. 
     In Embodiment 1, as the dummy pulse rate, use is made of the pulse rate calculated from the pulse data that was detected by the pulse sensor  19  immediately before, for example, time T 1  or time T 2  illustrated in  FIG. 3 , that is, a pulse rate immediately before the user performs a motion that is an error factor. Thereby, the pulse rate displayed on the display  10  of the electronic device  100  does not greatly vary, and the possibility lowers that the user doubts whether the displayed pulse rate is correct or not. 
     In addition, when the dummy pulse rate is displayed on the display  10  illustrated in  FIG. 1 , the display mode is made different between the dummy pulse rate and the pulse rate calculated from the data acquired from the pulse sensor  19 . Thereby, the user is enabled to understand that the dummy pulse rate is displayed. For example, as illustrated in  FIG. 4A , a specific mark  110  is displayed near the display of the pulse rate, or, as illustrated in  FIG. 4B , a frame  111  surrounding the display of the pulse rate is displayed, or the color of characters displaying the pulse rate is made different from the color for normal display. The specific mark  110 , frame  111 , the color of characters, and the like, are stored in the storage  21  illustrated in  FIG. 2  as set data for dummy display. 
     Referring to a flowchart of a display control process illustrated in  FIG. 5 , a description will be given of the control to display, in the electronic device  100 , a pulse rate including no error in place of a pulse rate including an error. The display control process is stored as a display control process program in the storage  21  illustrated in  FIG. 2 . In the electronic device  100 , when the function of measuring the pulse rate of the user and displaying the pulse rate is executed, the controller  25  illustrated in  FIG. 2  reads out the display control process program from the storage  21 , loads the display control process program in the RAM of the controller  25 , and executes the display control process program. 
     The pulse data acquirer  251  of the controller  25  illustrated in  FIG. 2  acquires pulse data of the user from the pulse sensor  19 . The pulse data acquirer  251  calculates a pulse rate from the acquired pulse data (step S 10 ). The determiner  254  of the controller  25  acquires the pulse rate of the user from the pulse data acquirer  251 , and determines whether or not the pulse rate is equal to or greater than a threshold (step S 11 ). When the pulse rate is equal to or greater than the threshold (step S 11 ; YES), the motion information acquirer  252  of the controller  25  illustrated in  FIG. 2  acquires data of acceleration detected from the motion detection sensor  20 . In addition, the motion information acquirer  252  acquires data of a direction of motion of the electronic device  100  from the motion detection sensor  20 , the direction of motion being detected by the motion detection sensor  20 . Here, it is assumed that the user twists the arm on which the electronic device  100  is worn, for example, at time T 1  illustrated in  FIG. 3 . 
     The determiner  254  determines whether the value of the data of acceleration acquired by the motion information acquirer  252  is equal to or greater than a threshold (step S 12 ). When the determiner  254  determines whether the value of the data of acceleration is equal to or greater than the threshold (step S 12 ; YES), the display controller  255  acquires data of the pulse rate, which was stored immediately before and includes no error, from the storage  21 , that is, data of a dummy pulse rate (step S 13 ). Subsequently, the display controller  255  acquires set data for dummy display from the storage  21 . The display controller  255  generates data for display, based on the data of the dummy pulse rate and the acquired set data for dummy display (step S 14 ). For example, as illustrated in  FIG. 4A , the display controller  255  generates data for display, which displays the specific mark  110  near the display of the pulse rate. 
     The display controller  255  causes the display  10  illustrated in  FIG. 1  to display the generated data for display (step S 15 ). Thereby, the display controller  255  updates display content that is displayed on the display  10 . The determiner  254  determines whether or not a predetermined period has elapsed since the data for display generated by the display controller  255  was displayed on the display  10  (step S 16 ). The predetermined period is, for example, a period preset by the user, or a period determined based on a timing when a factor of an error was detected, or the like. When the determiner  254  determines that the predetermined period has elapsed (step S 16 ; YES), the determiner  254  determines whether a period for acquiring a pulse rate has terminated (step S 17 ). For example, by an operation from the push button  13 ,  14 , or the touch panel  10   b,  illustrated in  FIG. 1 , when the screen is switched from the screen displaying both the present time and the pulse rate to the screen displaying only the present time, or when an instruction not to acquire the pulse rate is given, the determiner  254  can determine that the period for acquiring the pulse rate has ended. 
     When the determiner  254  determines that the period for acquiring the pulse rate has ended (step S 17 ; YES), the controller  25  terminates the display control process program. On the other hand, when the determiner  254  does not determine that the period for acquiring the pulse rate has ended (step S 17 ; NO), the controller  25  returns to step S 10  and executes step S 10  onwards. 
     In step S 16 , when the determiner  254  does not determine that the predetermined period has elapsed (step S 16 ; NO), the motion information acquirer  252  of the controller  25  illustrated in  FIG. 2  acquires the data of the direction of motion of the electronic device  100  from the motion detection sensor  20 . The determiner  254  determines whether the acquired data of the direction of motion of the electronic device  100  and the data of the direction of motion of the electronic device  100 , which was acquired by the motion information acquirer  252  before the determination in step S 12 , are the data of opposite directions (step S 18 ). 
     Here, it is assumed that the user restored the state of the arm wearing the electronic device  100  from the state in which the arm is twisted to the state before twisting the arm, that is, to the state at the time when the user is running, for example, at time T 2  illustrated in  FIG. 3 . In this case, the data of the direction of motion of the electronic device  100 , which is acquired by the motion information acquirer  252  from the motion detection sensor  20 , is the data of the opposite direction to the data of the direction of motion of the electronic device  100 , which was acquired before the determination in step S 12 . Thus, the determiner  254  determines that the data of the opposite direction is acquired (step S 18 ; YES), and the controller  25  executes step S 17 . On the other hand, if the determiner  254  determines that the data of the opposite direction is not acquired (step S 18 ; NO), the controller  25  returns to step S 16  and executes step S 16  onwards. 
     In addition, if the determiner  254  determines in step S 11  that the pulse rate, which is calculated from the pulse data acquired by the pulse data acquirer  251  of the controller  25 , is not equal to or greater than the threshold (step S 11 ; NO), or if the determiner  254  determines in step S 12  that the value of the data of acceleration acquired by the motion detection sensor  20  is not equal to or greater than the threshold (step S 12 ; NO), the display controller  255  generates data for display, based on the pulse rate calculated from the pulse data of the user acquired from the pulse data acquirer  251  (step S 20 ). The display controller  255  causes the display  10  illustrated in  FIG. 1  to display the generated data for display (step S 21 ). Thereby, the display controller  255  updates the display content that is displayed on the display  10 . The pulse data acquirer  251  stores the pulse rate calculated from the pulse data acquired from the pulse sensor  19  in the storage  21  (step S 22 ). The controller  25  executes step S 17 . 
     As described above, according to the electronic device  100  of Embodiment 1, the acceleration by motion of the user and the direction of the motion are detected by the motion detection sensor  20 . Thereby, in the electronic device  100  that is worn, the pulse rate including no error due to the motion of the user, that is, the biological information including no error, can be displayed. Hence, a great variation does not occur in the value of the biological information displayed on the display  10  of the electronic device  100 , and the possibility can be lowered that the user doubts whether the value of the displayed biological information is correct or not. In Embodiment 1, it is assumed that the acceleration by motion of the user and the direction of the motion are detected by the motion detection sensor  20 , but Embodiment 1 is not limited to this. For example, the twisting of the arm may be detected by detecting only the acceleration by motion of the user. Besides, the twisting of the arm may be detected by detecting only the direction of motion of the user. 
     Embodiment 2 
     In Embodiment 1 described above, when the pulse rate, which is calculated from the pulse data detected by the pulse sensor  19 , is equal to or greater than the threshold, it is determined whether the dummy pulse rate is to be displayed on the display  10  of the electronic device  100 , in accordance with the value of data of acceleration by motion of the user, the acceleration being acquired from the motion detection sensor  20 . The reason for this is that, for example, immediately after the motion of twisting the arm wearing the electronic device  100  and the motion of restoring the twisted arm, the blood flow in the blood vessel of the arm varies, and thus the value of the pulse data detected by the pulse sensor  19  includes an error. 
     However, the blood flow in the blood vessel of the arm also varies in motion other than the motion of twisting and restoring the arm. For example, when the rotary bezel  11  of the electronic device  100  illustrated in  FIG. 1A  is rotated, the user rotates the rotary bezel  11  in the state in which the electronic device  100  is pushed and fixed on the arm. While the electronic device  100  is pushed on the arm by the user, the blood vessel is pressed and, therefore, the blood flow in the blood vessel varies. 
     In addition, also when the crown  12 , or the push button  13 ,  14 , illustrated in  FIG. 1A , is operated, the user operates the crown  12 , or the push button  13 ,  14 , in the state in which the electronic device  100  is pushed and fixed on the arm, like the case of rotating the rotary bezel  11 . Further, when the user operates the touch panel  10   b  of the display  10 , a pressure acts on the touch panel  10   b  by the finger of the user, and, as a result, the electronic device  100  is pushed on the arm. Thus, since the blood vessel is pressed also when such operations are performed, the blood flow in the blood vessel varies. 
     As described above, when an operation from the user is performed on the operator  23  illustrated in  FIG. 2 , which includes the rotary bezel  11 , the crown  12 , the push buttons  13  and  14  and the touch panel  10   b  illustrated in  FIG. 1A , the blood vessel of the arm is pressed and the blood flow in the blood vessel varies. Consequently, there is a possibility that the pulse data detected by the pulse sensor  19  includes an error. Thus, by detecting that an operation by the user is performed on the operator  23 , a factor of the error included in the pulse data can be detected. 
     Thus, in Embodiment 2, when the pulse rate, which is calculated from the pulse data detected by the pulse sensor  19 , is equal to or greater than the threshold, it is determined whether or not to cause the display  10  of the electronic device  100  to display the dummy pulse rate, according to whether an operation from the user is accepted by the operator  23  illustrated in  FIG. 2 , which includes the rotary bezel  11 , crown  12 , push buttons  13  and  14  and touch panel  10   b  illustrated in  FIG. 1A . Note that the motion detection sensor  20  and the operator  23  are an example of an error factor detector in the patent claims. 
     An operation of a display control process for operation time in Embodiment 2 will be described with reference to a flowchart illustrated in  FIG. 6 . The display control process for operation time, like the display control process described in Embodiment 1, is stored as a display control process program for operation time in the storage  21  illustrated in  FIG. 2 . In the electronic device  100 , when the function of measuring the pulse rate of the user and displaying the pulse rate is executed, the controller  25  illustrated in  FIG. 2  reads out the display control process program for operation time from the storage  21 , loads the display control process program for operation time in the RAM of the controller  25 , and executes the display control process program for operation time. 
     The pulse data acquirer  251  of the controller  25  illustrated in  FIG. 2  acquires pulse data of the user from the pulse sensor  19 . The pulse data acquirer  251  calculates a pulse rate from the acquired pulse data (step S 30 ). The determiner  254  of the controller  25  acquires the pulse rate of the user from the pulse data acquirer  251 , and determines whether or not the pulse rate is equal to or greater than a threshold (step S 31 ). When the pulse rate is equal to or greater than the threshold (step S 31 ; YES), the operation information acquirer  253  of the controller  25  illustrated in  FIG. 2  acquires data relating to an operation from the user in the operator  23 . Here, for example, it is assumed that the user rotated the rotary bezel  11  illustrated in  FIG. 1A . 
     The determiner  254  determines whether or not the data acquired from the operation information acquirer  253  is data indicating that an operation from the user was performed (step S 32 ). When the determiner  254  determines that the data acquired from the operation information acquirer  253  is data indicating that an operation from the user was performed (step S 32 ; YES), the display controller  255  acquires data of the pulse rate, which was stored immediately before and includes no error, from the storage  21 , that is, data of a dummy pulse rate (step S 33 ). Subsequently, the display controller  255  acquires set data for dummy display from the storage  21 . The display controller  255  generates data for display, based on the data of the dummy pulse rate and the acquired set data for dummy display (step S 34 ). For example, as illustrated in  FIG. 4A , the display controller  255  generates data for display, which displays the specific mark  110  near the display of the pulse rate. 
     The display controller  255  causes the display  10  illustrated in  FIG. 1  to display the generated data for display (step S 35 ). The determiner  254  determines whether or not a predetermined period has elapsed since the data for display generated by the display controller  255  was displayed on the display  10  (step S 36 ). The predetermined period is, for example, a period preset by the user. When the determiner  254  determines that the predetermined period has elapsed (step S 36 ; YES), the determiner  254  determines whether a period for acquiring a pulse rate has terminated (step S 37 ). For example, by an operation from the push button  13 ,  14  or the touch panel  10   b  illustrated in  FIG. 1 , when the screen is switched from the screen displaying both the present time and the pulse rate to the screen displaying only the present time, or when an instruction not to acquire the pulse rate is given, the determiner  254  can determine that the period for acquiring the pulse rate has ended. When the determiner  254  does not determine that the predetermined period has elapsed (step S 36 ; NO), the determiner  254  repeats step S 36 . 
     When the determiner  254  determines that the period for acquiring the pulse rate has ended (step S 37 ; YES), the controller  25  terminates the display control process program. On the other hand, when the determiner  254  does not determine that the period for acquiring the pulse rate has ended (step S 37 ; NO), the controller  25  returns to step S 30  and executes step S 30  onwards. 
     In addition, if the determiner  254  determines in step S 31  that the pulse rate, which is calculated from the pulse data acquired by the pulse data acquirer  251  of the controller  25 , is not equal to or greater than the threshold (step S 31 ; NO), or if the determiner  254  determines in step S 32  that the data acquired from the operation information acquirer  253  is not data indicating that an operation from the user was performed (step S 32 ; NO), the display controller  255  generates data for display, based on the pulse rate calculated from the pulse data of the user acquired from the pulse data acquirer  251  (step S 40 ). The display controller  255  causes the display  10  illustrated in  FIG. 1  to display the generated data for display (step S 41 ). The pulse data acquirer  251  stores the pulse rate calculated from the pulse data acquired from the pulse sensor  19  in the storage  21  (step S 42 ). The controller  25  executes step S 37 . 
     As described above, according to the electronic device  100  of Embodiment 2, an operation from the user on the operator  23  is detected. Thereby, in the electronic device  100  that is worn, the pulse rate including no error due to the operation of the user, that is, the biological information including no error, can be displayed. Hence, a great variation does not occur in the value of the biological information displayed on the display  10  of the electronic device  100 , and the possibility that the user doubts whether the value of the displayed biological information is correct or not can be lowered. 
     Modifications 
     The present disclosure is not limited to Embodiments 1 and 2 described above, and, needless to say, various modifications can be made without departing from the spirit of the present disclosure. 
     In Embodiment 1, the determination as to whether or not to cause the display  10  of the electronic device  100  to display the dummy pulse rate is executed in accordance with the acceleration detected by the motion detection sensor  20 , and, in Embodiment 2, this determination is executed according to whether or not the operation from the user was performed on the operator  23 . Aside from this, the determination as to whether or not to cause the display  10  of the electronic device  100  to display the dummy pulse rate may be executed in accordance with the acceleration detected by the motion detection sensor  20 , and/or according to whether or not the operation from the user was performed on the operator  23 . 
     In Embodiments 1 and 2, it is assumed that the data of the pulse rate, which is stored in the storage  21  immediately before and includes no error, is used as the data of the dummy pulse rate. Aside from this, use may be made of an average value of the data of pulse rates which are stored in the storage  21  and include no error, or data of a dummy pulse rate stored in advance in the storage  21 . Further, the next pulse rate may be estimated by calculating a differential value from the data of the pulse rate of the user, and the dummy pulse rate may be displayed. In addition, the number of dummy pulse rates is not limited to one, and, for example, a plurality of dummy pulse rates may be displayed, while being varied, in accordance with vibration occurring when the user is running. 
     In Embodiments 1 and 2, when the dummy pulse rate is displayed, a pulse rate that is measured in real time is not displayed. Both the pulse rate measured in real time and the dummy pulse rate may be displayed at the same time. 
     In Embodiments 1 and 2, when the dummy pulse rate is displayed, the data of the pulse rate continues to be acquired, but the data of the pulse rate may not be acquired at least during the period in which the dummy pulse rate is displayed. 
     In Embodiments 1 and 2, it is assumed that the pulse rate of the user is used as the biological information. Aside from this, various pieces of information detected from the user, such as the body temperature, blood pressure and brain wave, may be used as the biological information. In addition, in Embodiments 1 and 2, it is assumed that the pulse sensor  19  is used as biological information acquisition means. Aside from this, as the biological information acquisition means, a temperature sensor, a blood pressure measuring device, a brain wave measuring device, or the like may be used, in accordance with biological information to be acquired. Note that the biological information acquisition means, such as the pulse sensor  19 , the temperature sensor, the blood pressure measuring device, or the brain wave measuring device, is an example of a biological information acquirer in the patent claims. 
     Furthermore, in Embodiments 1 and 2, it is assumed that the electronic device  100  is used the wearable terminal which can be worn on, for example, the wrist, arm or the like of the user. Aside from this, the wearable terminal may be changed in accordance with the kind of biological information to be acquired. For example, use may be made of terminals of various forms in accordance with biological information to be measured, such as an eyeglass-type terminal in the case of detecting the brain wave, or a finger-ring-type terminal in the case of measuring the body temperature. 
     In Embodiments 1 and 2, the determination as to whether or not to cause the display  10  of the electronic device  100  to display the dummy pulse rate is executed based on the data detected by the motion detection sensor  20  or the operator  23 . Aside from this, the determination may be executed based on data detected from a solar panel, a geomagnetism sensor, a microphone, or the like. 
     In addition, methods of application of the display control process program and the display control process program for operation time in Embodiments 1 and 2 can be freely chosen. For example, each program can be applied by being stored in a computer-readable storage medium, such as a flexible disc, a compact disc (CD)-ROM, a digital versatile disc (DVD)-ROM, or a memory card. Further, a program can be superimposed on a carrier wave, and can be applied via a communication medium such as the Internet. For example, a program may be delivered by being posted on a bulletin board system (BBS) on a communication network. Besides, such a configuration may be adopted that the above-described process can be executed by starting and executing this program under the control of an operating system (OS), like other application programs. 
     The foregoing describes some example embodiments for explanatory purposes. 
     Although the foregoing discussion has presented specific embodiments, persons skilled in the art will recognize that changes may be made in form and detail without departing from the broader spirit and scope of the invention. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. This detailed description, therefore, is not to be taken in a limiting sense, and the scope of the invention is defined only by the included claims, along with the full range of equivalents to which such claims are entitled.