Patent Publication Number: US-11024068-B2

Title: Implementing time display on a watch based on whether a wearer has looked at the watch

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     The present application is a continuation of U.S. patent application Ser. No. 16/446,057, filed on Jun. 19, 2019, which is a continuation of U.S. patent application Ser. No. 15/504,451, filed on Feb. 16, 2017, issued on Aug. 27, 2019 as U.S. Pat. No. 10,395,406, which is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/JP2015/073468, filed on Aug. 21, 2015, which claims the priority from Japanese Patent Application No. 2014-180536, filed in the Japanese Patent Office on Sep. 4, 2014, and Japanese Patent Application No. 2015-045905, filed in the Japanese Patent Office on Mar. 9, 2015, the disclosures of which are hereby incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an apparatus and method for displaying information, a program, and a communication system, and particularly relates to an apparatus and method for displaying information, a program, and a communication system, which enable the provision of an apparatus that makes use of a display device excellent in flexibility. 
     BACKGROUND ART 
     There is an electrophoretic display (Electrophoretic Display) generally also called electronic paper. The electrophoretic display simply requires the passage of electric current only at the time of switching of a display, and does not require the passage of current to maintain the display. Accordingly, the electrophoretic display has a feature of low power consumption. Moreover, the electrophoretic display has a thin film shape, can deform its shape freely to some extent, and is excellent in flexibility. 
     Electronic paper used for the display of a dial of a wall-mount clock is proposed (see, for example, Patent Document 1). Moreover, there is electronic paper used for the display of a dial of a wristwatch (see, for example, Patent Document 2). 
     CITATION LIST 
     Patent Documents 
     
         
         Patent Document 1: Japanese Patent Application Laid-Open No. 2008-39697 
         Patent Document 2: Japanese Patent Application Laid-open No. 2007-285748 
       
    
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     In recent years, it is being desired that a product using a display device that is excellent in flexibility as in an electrophoretic display is developed. 
     The present disclosure has been made considering such circumstances, and enables the provision of an apparatus making use of a display device that is excellent in flexibility. 
     Solutions to Problems 
     An information display apparatus according to a first aspect of the present disclosure includes: a display unit including a time information presenting section for presenting at least time information, and a band section to be worn on an arm; and a display control unit for changing a display of the display unit. 
     An information display method of an information display apparatus according to a second aspect of the present disclosure includes a display control unit of the information display apparatus changing a display of a display unit including a time information presenting section for presenting at least time information and a band section to be worn on an arm. 
     A program according to a third aspect of the present disclosure is the program for causing a computer to function as a display control unit for changing a display of a display unit including a time information presenting section for presenting at least time information and a band section to be worn on an arm. 
     In the first to third aspects of the present disclosure, the display of the display unit including the time information presenting section for presenting at least time information and the band section to be worn on an arm is changed. 
     A communication system according to a fourth aspect of the present disclosure includes: an information display apparatus; and a terminal apparatus, wherein the information display apparatus includes a display unit including a time information presenting section for presenting at least time information, and a band section to be worn on an arm, a display control unit for changing a display of the display unit, and a communication unit for receiving, from the terminal apparatus, design data to be displayed on the display unit, and the terminal apparatus transmits the design data to the communication unit. 
     In the fourth aspect of the present disclosure, the information display apparatus receives the design data to be displayed on the display unit, and changes the display of the display unit including the time information presenting section for presenting at least time information and the band section to be worn on an arm. The terminal apparatus transmits the design data to the communication unit of the information display apparatus. 
     Incidentally, the program can be provided by being transmitted via a transmission medium, or recorded in a recording medium. 
     The information display apparatus may be an independent apparatus, or may be an internal block configuring one device. 
     Effects of the Invention 
     According to the first to fourth aspects of the present disclosure, an apparatus making use of a display device that is excellent in flexibility can be provided. 
     Incidentally, the effects described herein are not necessarily limited and may be any of the effects described in the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram illustrating an external configuration example of a watch according to a first embodiment. 
         FIG. 2  is a control block diagram related to display control of a wristwatch according to the first embodiment. 
         FIG. 3  is a cross-sectional view in a direction perpendicular to a longitudinal direction of the wristwatch. 
         FIG. 4  is a cross-sectional view in a direction along the longitudinal direction of the wristwatch. 
         FIG. 5  is a perspective view illustrating the structure of the back of a face section. 
         FIG. 6  is a diagram illustrating another example of circuit placement. 
         FIG. 7  is a diagram illustrating another example of circuit placement. 
         FIG. 8  is a diagram illustrating another example of a fastening. 
         FIG. 9  is a diagram illustrating another example of the fastening. 
         FIG. 10  is a diagram illustrating examples of six kinds of displayable display patterns. 
         FIG. 11  is a diagram illustrating an example of a segment configuration of a band section. 
         FIG. 12  is a flowchart describing a display pattern change process. 
         FIG. 13  is a diagram describing an action detection process. 
         FIG. 14  is a flowchart describing the action detection process. 
         FIG. 15  is a diagram illustrating examples of other action of the action detection process. 
         FIG. 16  is a diagram illustrating a display example of the action detection process. 
         FIG. 17  is a flowchart describing a power save process. 
         FIG. 18  is a diagram illustrating an example of display control in power save mode. 
         FIG. 19  is a flowchart describing a power save switching process. 
         FIG. 20  is a control block diagram related to display control of a wristwatch according to a second embodiment. 
         FIG. 21  is a diagram illustrating a configuration example of a display pattern providing system. 
         FIG. 22  is a flowchart describing a design data providing process. 
         FIG. 23  is a diagram illustrating an example of a wristwatch including a two-dimensional array segment area in a display unit. 
     
    
    
     MODES FOR CARRYING OUT THE INVENTION 
     Modes for carrying out the present disclosure (hereinafter referred to as the embodiments) are described hereinafter. Incidentally, a description is given in the following order: 
     1. First Embodiment (a configuration example where a display pattern is changed with internal data), and 
     2. Second Embodiment (a configuration example where the display pattern is changed with data acquired from a server). 
     1. First Embodiment of Watch 
     &lt;External Configuration Example of Watch&gt; 
     Firstly, a first embodiment of a watch according to the present disclosure is described. 
       FIG. 1  illustrates an external configuration example of the watch according to the first embodiment. 
     A wristwatch  1  illustrated in  FIG. 1  is a watch used worn on an arm (wrist). 
     The wristwatch  1  is configured including a substantially circular face section  21  being a time information presenting section for displaying time information such as a scale, numbers, a minute hand, and an hour hand, and a band section (bracelet section)  22  to be worn on an arm. The face section  21  and the band section  22  form a display unit  11 . 
     In  FIG. 1 , number “6” displayed on the face section  21  indicates the hour (six), and a hand displayed near a mark at three o&#39;clock indicates the minute hand. Therefore, the wristwatch  1  illustrated in  FIG. 1  indicates that the time is 6:15. The band section  22  has a display illustrating a pattern design. 
     The face section  21  and the band section  22  are fitted in an integrally-molded rubber band  24 . The rubber band  24  is molded thick at the outer edge such that the surface of the wristwatch  1  is on the same plane when the face section  21  and the band section  22  are fitted into it. 
     A plurality of recesses  25  is formed near one end of a back  12  of the rubber band  24  along its longitudinal direction, and a buckle  26  is formed at the other end. A protrusion  27  formed on the buckle  26  is inserted into a predetermined recess  25 , corresponding to the size of the wrist of a user, of the plurality of recesses  25  formed in the rubber band  24  to fix the wristwatch  1  to the arm of the user. 
     A push button  28  is placed on a side of the face section  21 . The push button  28  functions as a selection unit that accepts the user&#39;s push operation and accepts the user&#39;s selection operation. Incidentally, a configuration is also acceptable in which, for example, a digital crown, instead of the push button  28 , is provided. 
     In the wristwatch  1  configured as described above, the display unit  11  forms the surfaces of both the face section  21  and the band section  22 . Accordingly, a display of the display unit  11  is updated to enable changes in the display contents of the face section  21  and the band section  22 . Consequently, it is possible to update time information on the face section  21  and change the band design (pattern design information) of the band section  22 . 
     &lt;Control Block Diagram of Watch&gt; 
       FIG. 2  illustrates a control block diagram related to display control of the wristwatch  1 . 
     The wristwatch  1  includes the display unit  11  and a control unit  41  that controls the display unit  11 . 
     The display unit  11  includes an electrophoretic display (Electrophoretic Display)  51  also called electronic paper or EPD, and provides a predetermined display through control from the control unit  41 . 
     The structure of the electrophoretic display  51  is briefly described. 
     The electrophoretic display  51  has, for example, a structure where upper and lower surfaces of a microcapsule-filled layer are sandwiched between electrode layers, and the electrode layer that is visually perceived by the user includes a transparent electrode layer such as indium tin oxide (ITO) or ZnO. 
     The microcapsule-filled layer is filled with microcapsules each including a single or a plurality of particles in a transparent solution. For example, if two kinds of particles, white and black particles, are filled in a microcapsule in the microcapsule-filled layer, when a positive voltage is applied to the transparent electrode layer on the display surface side, the negatively charged white particles gather on the transparent electrode layer side to display white (color). Conversely, when a negative voltage is applied to the transparent electrode layer on the display surface side, the positively charged black particles gather on the transparent electrode layer side to display black (color). In this manner, the electrophoretic display  51  can display white or black by control over voltage to be applied to the electrode layer. Moreover, a display in black-and-white halftone (a display in gray) can also be possible by setting a plurality of levels of applied voltage. 
     A feature of the electrophoretic display  51  is low power consumption. In other words, the electrophoretic display  51  does not need backlight that is required by a liquid crystal display (LCD). Moreover, the electrophoretic display  51  is simply required to pass current only when the display is switched and does not need to pass current to maintain the display. Hence, the electrophoretic display  51  can provide a display with very lower power consumption than an LCD or the like. 
     Moreover, another feature of the electrophoretic display  51  is flexibility. In other words, the electrophoretic display  51  has a thin film shape and can deform its shape freely to some extent. 
     Incidentally, the electrophoretic display  51  does not need to be limited to the above-mentioned microcapsule technology. Furthermore, another technology other than the electrophoretic type known as the technology for the display of electronic paper is also acceptable. In other words, as a display of the display unit  11 , the technology is not limited as long as it is electronic paper that can electronically rewrite display contents among display media that hold viewability and portability that are the advantages of paper. 
     The control unit  41  includes a storage unit  61 , an oscillator  62 , an accelerometer  63 , a power supply unit  64 , a push SW  65 , a controller  66 , and a driving unit  67 . 
     The storage unit  61  includes a nonvolatile memory such as an electrically and erasable programmable read only memory (EEPROM), and stores various programs and various kinds of data necessary for control. 
     The storage unit  61  stores, for example, a program for controlling the display of the display unit  11  including the face section  21  and the band section  22 , a program for time control based on a clock signal from the oscillator  62 , and a program for operation control based on a sensor signal from the accelerometer  63 . The program for controlling the display of the display unit  11  also includes design data specifying a display pattern of the display unit  11 , the design data being described below with reference to  FIG. 10 . 
     The programs and data that are stored in the storage unit  61  are read out by the controller  66  if needed. Moreover, the storage unit  61  can be configured to be detachable from the wristwatch  1 . Alternatively, the storage unit  61  may also be incorporated as part of the controller  66 . 
     The oscillator  62  includes, for example, a crystal or ceramic resonator, or an oscillation circuit, generates a clock signal to become a base for time information, and supplies the clock signal to the controller  66 . 
     The accelerometer  63  is a sensor that detects acceleration from three axes of an X axis, a Y axis, and a Z axis (a gyro sensor), and supplies the detection result to the controller  66 . 
     The power supply unit  64  includes a regulated power supply  71 , a battery  72 , and a residual voltage detection unit  73 . The power supply unit  64  causes the regulated power supply  71  to regulate a power supply voltage obtained from the battery  72  to a constant voltage, and supplies it to each portion of the control unit  41  that requires power supply. The residual voltage detection unit  73  detects the residual voltage of the battery  72  and, when the battery capacity of the battery  72  decreases to or below a fixed level, supplies a signal indicating as such to the controller  66 . 
     The push switch (SW)  65  detects the user&#39;s operation on the push button  28  and outputs it as an electrical signal to the controller  66 . 
     The controller  66  includes, for example, a microcomputer and a central processing unit (CPU), and executes processes of controlling the display of the display unit  11  with various programs read out from the storage unit  61 . For example, the controller  66  uses a clock signal supplied from the oscillator  62  to supply a control signal for updating the time information of the display unit  11  to the driving unit  67 . Moreover, for example, the controller  66  uses the detection result of the accelerometer  63  to supply a control signal for changing the display of the display unit  11  to the driving unit  67  when the wristwatch  1  enters a predetermined state. Specific display of the display unit  11  by the control by the controller  66  is described below. 
     The driving unit  67  includes, for example, a driver IC that drives the electrophoretic display  51 . The driving unit  67  uses a control signal from the controller  66  to drive the electrophoretic display  51 . The electrophoretic display  51  is divided into a plurality of segments. The driving unit  67  is controlled on a segment-by-segment basis. The electrophoretic display  51  and the driving unit  67  are connected by, for example, flexible printed circuits (FPC)  42 . 
     &lt;Cross-Sectional View&gt; 
       FIG. 3  illustrates a cross-sectional view of the wristwatch  1  in a direction perpendicular to the longitudinal direction of the rubber band  24  through the push button  28 . 
     Incidentally, in  FIG. 3 , the same reference signs are assigned to parts corresponding to  FIGS. 1 and 2 . 
     The electrophoretic display  51  is covered with a transparent protection sheet  91  and arranged in such a manner as to be on the same plane as the rubber band  24  on the periphery. 
     A printed board  95  is placed below the electrophoretic display  51 , and is fixed and protected by a plurality of inner cases  92  to  94 . The printed board  95  is equipped with the storage unit  61 , the oscillator  62 , the controller  66 , and the like. The electrophoretic display  51  and the printed board  95  are connected by the FPC  42 . 
     The push SW  65  provided on the back (lower side in  FIG. 3 ) of the printed board  95  is placed in contact with the push button  28  to enable the detection of the operation of pressing the push button  28 . 
     The accelerometer  63  and the battery  72  are also placed on the back of the printed board  95 . A cover  96  on the back  12  of the wristwatch  1  is removed to expose the battery  72  in a replaceable manner. 
       FIG. 4  is a cross-sectional view of the main structure of the wristwatch  1  in a direction along the longitudinal direction of the rubber band  24 . 
     The electrophoretic display  51  formed in the face section  21  and the band section  22  is connected, at one end of the band section  22 , to the FPC  42 . The FPC  42  formed in a strip with substantially the same width as that of the band section  22  is folded back from a connection portion with the band section  22 , and is connected to the printed board  95  placed on a back surface side of the face section  21 . The FPC  42  is connected to an upper surface of the printed board  95 . The battery  72  is placed on a lower surface side of the printed board  95 . 
       FIG. 5  is a perspective view illustrating the structure of the back  12  of the face section  21 , from which the cover  96  has been removed. 
     Circuits including the printed board  95  are integrated at the back of the face section  21 . The periphery of the circuit part is surrounded by a gasket  97  with a water-proof function. The material of the gasket  97  is, for example, silicone rubber. In this manner, the wristwatch  1  encloses the circuit part within the gasket  97  to offer flexibility and waterproofness. 
     &lt;Another Example of Circuit Placement&gt; 
     As described above, the embodiment adopts the placement where the electric circuits forming the control unit  41  are integrated in the lower part of the face section  21 , what is called a dial section. For example, a configuration where the electric circuits forming the control unit  41  are placed in the buckle section  26  can also be adopted as illustrated in  FIG. 6 . In this case, the face section  21  can be made thin, and also the FPC  42  that connects the electrophoretic display  51  and the printed board  95  can be reduced (made smaller). In addition, there is no fold. Accordingly, the FPC  42  can be prevented from being damaged. 
     Moreover, as illustrated in  FIG. 7 , the face section  21  does not include the electric circuits; accordingly, the face section  21  can also be formed flexibly as in the band section  22 . 
     Incidentally, all the electric circuits forming the control unit  41  may be placed in the buckle section  26 . However, part of components such as a communication antenna, a sensor, and a battery may be placed in the band section  22 . 
     &lt;Another Example of Fastening&gt; 
       FIG. 8  illustrates another example of the fastening for fixing the wristwatch  1  to an arm. 
       FIG. 1  illustrates the belt-type structure where the protrusion  27  provided to the buckle  26  is inserted into one of the plurality of recesses  25  provided in the rubber band  24  to fix (wear) the wristwatch  1  to (on) an arm. 
     However, as illustrated in  FIG. 8 , for example, a buckle  101  to be used for a watch with a metal bracelet can also be adopted as the fastening. 
     Incidentally, the structure illustrated in  FIG. 8  is an example of the structure where the buckle  101  is not included in the display unit  11 . However, as illustrated in  FIG. 9 , a configuration can also be employed in which when the wristwatch  1  is fixed to an arm, the band section  22  is extended up to an upper surface of the buckle  101  such that the buckle  101  is hidden by the display unit  11 . Accordingly, the upper surface of the buckle  101  can also serve as the display unit  11 . 
     &lt;Pattern Example of Display Pattern&gt; 
     The wristwatch  1  is configured such that desired design data is selected from a plurality of kinds of design data stored in the storage unit  61  to allow the user to change the display pattern of the display unit  11  freely. 
       FIG. 10  illustrates examples of six kinds of display patterns that can be displayed on the display unit  11  with the design data stored in the storage unit  61 . 
     Incidentally, the reference signs are omitted in  FIG. 10 . Moreover,  FIG. 10  illustrates examples where the color of the rubber band  24  formed on the periphery in such a manner as to surround the face section  21  and the band section  22  is black. 
     A and B of  FIG. 10  are examples of display patterns of designs where the band section  22  is alligator skin-like. 
     C of  FIG. 10  is an example of a display pattern of a design where the band section  22  imitates a stitched leather band. 
     D of  FIG. 10  is an example of a display pattern of a design where the band section  22  imitates a metal bracelet. 
     E and F of  FIG. 10  are examples of display patterns of designs where the band section  22  imitates plain leather bands. 
     The display patterns illustrated in A to F of  FIG. 10  are mere examples. For example, design data that enables the display of 36 kinds of display patterns including the six kinds of display patterns illustrated in A to F of  FIG. 10  is stored in the storage unit  61 . 
       FIG. 11  is a diagram illustrating an example of a segment configuration of the band section  22 , the segment configuration achieving the display patterns of A to F of  FIG. 10 . 
     As illustrated in  FIG. 11 , the band section  22  is divided into segment areas  141  each being a control unit of the electrophoretic display  51  that controls the turning-on/off of display. In  FIG. 11 , each single area enclosed by a solid line represents the segment area  141 . Although the illustration is omitted, the face section  21  is also divided into segment areas  141  corresponding to the display positions of the scale, the numbers, and the minute hand. In the embodiment, the number of the divided segment areas  141  of the electrophoretic display  51  is, for example,  89 . 
     One piece of the design data stored in the storage unit  61  is, for example, data that specifies the turning-on/off of each of the  89  segment areas  141  of the electrophoretic display  51 . 
     &lt;Display Pattern Change Process&gt; 
       FIG. 12  is a flowchart of a display pattern change process of when the display pattern of the display unit  11  is changed. 
     In the display pattern change process, firstly in step S 1 , the controller  66  determines whether or not the user has performed a start operation of starting a display pattern change mode of changing the display pattern using a signal supplied from the push SW  65 . 
     For example, an operation of holding down the push button  28  for a fixed period of time (for example, eight seconds) is performed to start the display pattern change mode in the wristwatch  1 . The processing of step S 1  is repeated until it is determined in step S 1  that the user has performed the start operation of starting the display pattern change mode. 
     Then, if it is determined in step S 1  that the user has performed the start operation of starting the display pattern change mode, the processing proceeds to step S 2 . The controller  66  starts the display pattern change mode. The controller  66  may provide a display that allows the user to recognize that the display pattern change mode has been started (for example, a display of a reversed display pattern). 
     In step S 3 , the controller  66  determines whether or not the user has performed an operation of changing the display pattern using a signal supplied from the push SW  65 . 
     If, for example, a press operation on the push button  28  is specified as the operation of changing the display pattern in the wristwatch  1 , whether or not the press operation on the push button  28  has been performed is detected in step S 3 . The processing of step S 3  is repeated until it is determined in step S 3  that the user has performed the operation of changing the display pattern. 
     If it is determined in step S 3  that the operation of changing the display pattern has been performed, the processing proceeds to step S 4 . The controller  66  changes the display pattern of the display unit  11 . Specifically, the controller  66  acquires, from the storage unit  61 , design data of a display pattern different from a display pattern that is currently being displayed on the display unit  11 , and supplies a control signal that drives the electrophoretic display  51  to the driving unit  67  on the basis of the acquired design data. The driving unit  67  uses the control signal corresponding to the new display pattern to drive each segment area  141  of the electrophoretic display  51 . 
     In step S 5 , the controller  66  determines whether or not the user has performed an operation of confirming the display pattern. 
     In the embodiment, for example, the operation of holding down the push button  28  for a fixed period of time (for example, eight seconds) is the operation of confirming the display pattern. In this case, whether or not the operation of holding down the push button  28  for the fixed period of time is detected in step S 5 . 
     If it is determined in step S 5  that the user has not performed the operation of confirming the display pattern, the processing returns to step S 3  to repeat the above-mentioned processing of steps S 3  to S 5 . In other words, the process of displaying a new display pattern on the display unit  11  in accordance with the user&#39;s operation of changing the display pattern is repeated until the display pattern is confirmed. 
     On the other hand, if it is determined in step S 5  that the user has performed the operation of confirming the display pattern, the processing proceeds to step S 6 . The controller  66  ends the display pattern change mode that changes the display pattern to end the display pattern change process. 
     The above display pattern change process is executed in the wristwatch  1 ; accordingly, the user can select and display a desired display pattern from the plurality of display patterns. In other words, the user can have pleasure in switching not only the design of the face section  21  but also the design of the band section  22  according to the place, use, mood, and the like. 
     Incidentally, the start operation of starting the display pattern change mode and the operation of changing the display pattern are not limited to the above-mentioned example. The operations may be set such that, for example, when the push button  28  is pressed in a time display state where the current time is being displayed, the display pattern of the time display state can be changed, and when the push button  28  is pressed in a standby state where the current time is not being displayed, the display pattern in the standby state can be changed. 
     Moreover, the operations can be set such that, for example, if a digital crown that is rotated for drive, instead of the push button  28 , is provided, the digital crown is pulled outward to enter the display pattern change mode, and when the digital crown is rotated, the display pattern is changed. 
     &lt;Action Detection Process&gt; 
     The accelerometer  63  is integrated in the wristwatch  1 , and has an action detection mode that detects the motion of the wristwatch  1  with the accelerometer  63  and changes the display of the display unit  11  in accordance with the detected motion of the wristwatch  1 . 
     If the action detection mode is executed, the wristwatch  1  can perform the display control such that, for example, only when the user looks at the wristwatch  1  to check the current time, the wristwatch  1  provides a display corresponding to the current time, and when the user is not looking at the wristwatch  1 , the display unit  11  displays nothing, as illustrated in  FIG. 13 . When the user checks the current time, the wristwatch  1  is placed at a position substantially horizontal with respect to the ground. Hence, the wristwatch  1  uses a sensor signal of the accelerometer  63  to detect the horizontal state of the wristwatch  1 , determines whether or not the user is looking at the wristwatch  1 , and performs the display control described in  FIG. 13 . 
       FIG. 14  is a flowchart of the action detection process that is performed by the controller  66  when the action detection mode is executed. 
     Firstly in step S 11 , the controller  66  determines whether or not the user has performed the operation of looking at the wristwatch  1 . In other words, the controller  66  determines whether or not a sensor signal supplied from the accelerometer  63  indicates an angle within a predetermined range indicating the state where the wristwatch  1  is horizontal with respect to the ground and, if the sensor signal indicates the angle within the predetermined range indicating the horizontal state, determines that the user has performed the operation of looking at the wristwatch  1 . 
     If it is determined in step S 11  that the user has performed the operation of looking at the wristwatch  1 , the processing proceeds to step S 12 . The controller  66  calculates the current time using a clock signal from the oscillator  62  and controls the display of the face section  21  in such a manner as to display the calculated current time. Moreover, the controller  66  also controls the display of the band section  22  in such a manner as to provide a display pattern selected by the user in the display pattern change process. As a result, the display unit  11  of the wristwatch  1  provides, for example, the display illustrated in  FIG. 1 . 
     On the other hand, if it is determined in step S 11  that the user has not performed the operation of looking at the wristwatch  1 , the processing proceeds to step S 13 . The controller  66  controls the display of the display unit  11  in such a manner as to suppress display. For example, the controller  66  controls the drive of the electrophoretic display  51  such that the whole area of the face section  21  and the band section  22  are white or black. 
     After the processing of step S 12  or S 13 , the processing returns again to step S 11  to execute the above-mentioned processing. 
     Incidentally, if a determination result of the next step S 11  is the same as a determination result of the previous step S 11 , the processing of steps S 12  and S 13  can be omitted. This is because the electrophoretic display  51  has the feature where it is simply required to pass current only when the display is switched, and there is no need to pass current to maintain the display. 
     When the action detection mode is released, the action detection process of  FIG. 14  ends. 
     As described above, the display of the display unit  11  including the face section  21  and the band section  22  can be changed using a sensor signal of the accelerometer  63 . 
     Incidentally, it is natural that the wristwatch  1  can also execute an operation of displaying the current time all the time as a normal watch mode in addition to the action detection mode as in a general wristwatch. 
     In the above-mentioned example, when the user is not performing the operation of looking at the wristwatch  1 , the display in the whole area of the face section  21  and the band section  22  is suppressed. However, a set display pattern may be displayed on the band section  22  all the time. The electrophoretic display  51  requires power only when the display is switched. Accordingly, even if a pattern is displayed on the band section  22  all the time, there is no influence on the power consumed. 
     As described below as a second embodiment, if the wristwatch  1  also includes a sensor  201  of a different type from the accelerometer  63 , step S 11 &#39;s determination on whether or not the user has performed the operation of looking at the wristwatch  1  may be based on a detection result of the sensor  201  other than the accelerometer  63 . If, for example, the sensor  201  is a brightness sensor, brightness above the dial is detected by the brightness sensor. When brightness at a predetermined level or higher is detected, it can be determined that the user has performed the operation of looking at the wristwatch  1 . 
     &lt;Another Example of Action Detection Process&gt; 
     The controller  66  may detect a footstep count, movement speed, or the like using a sensor signal supplied from the accelerometer  63  and, when a predetermined footstep count or speed is detected, perform display control to change the display of at least one of the face section  21  and the band section  22 . 
     Moreover, the controller  66  can also perform display control to change the display pattern of the display unit  11  in accordance with an elapsed time such as whenever the date changes, on the same day every week, at noon and night, and after the passage of every fixed time. Not only the face section  21  but also the band section  22  can change the display in the wristwatch  1  in the embodiment. Accordingly, unprecedented various displays are possible. 
     &lt;Another Action Example of Action Detection Process&gt; 
     In the action detection process described with reference to  FIG. 14 , the user&#39;s action of looking at the wristwatch  1  is determined from the sensor output of the accelerometer  63 . However, the controller  66  can also determine another action of the user from the sensor output to change the display of the display unit  11  in accordance with the determination result. 
       FIG. 15  illustrates examples of other actions that can be determined by the controller  66 . 
     For example, the controller  66  can determine an action of tapping (tapping) an upper surface (top surface), or the right-hand, left-hand, near side, or far side surface of the wristwatch  1  as illustrated in A of  FIG. 15 . 
     For example, the controller  66  can determine an action of turning the wristwatch  1  toward the right, left, front, or back as illustrated in B of  FIG. 15 . 
     For example, the controller  66  can determine an action of shaking (shaking) the wristwatch  1  as illustrated in C of  FIG. 15 . 
     Such various actions can cooperate with various displays of the display unit  11 . 
     When, for example, an action of shaking the wristwatch  1  twice in a short time is detected, the controller  66  can perform control to display the current time on the display unit  11  whose display is off. In such a case, when the wristwatch  1  is placed on a table, the time can be checked only by one hand in a simple shaking action. 
     Moreover, if, for example, the way the pattern (display pattern) of the display unit  11  changes is presented to another user, the wristwatch  1  can perform display control to change to the next pattern by turning the wristwatch  1  outward and return to the previous pattern by turning the wristwatch  1  inward. 
     The above-mentioned various actions can also be used as time setting operations, and the user&#39;s operations detected in the display pattern change process described in  FIG. 12 . If all of various setting operations and display change operations are performed by the detection of actions, a hardware button such as the push button  28  can also be eliminated. Display in cooperation with the action detection makes it possible to implement a comfortable, intuitive operation. 
     The display unit  11  of the embodiment includes the segment areas  141 , the number of kinds of display patterns of which is limited to  36  as described with reference to  FIG. 11 . However, if a given pattern (display image) can be displayed on the display unit  11 , such displays in accordance with the actions as illustrated in  FIG. 16  can also be further provided. 
     A of  FIG. 16  is a display example of an image (pattern) where fish is swimming. For example, if the user shakes the wristwatch  1 , the display unit  11  provides a display where the water surface waves and fish moves swiftly. Moreover, if, for example, the user taps on the right-hand side of the wristwatch  1 , the display unit  11  provides a display where the fish runs to the left-hand side opposite to the tapped position. 
     B of  FIG. 16  is a display example of an image (pattern) of a slime-like character. If, for example, the user shakes the wristwatch  1 , the display unit  11  provides a display where the slime-like character wobbles. Moreover, if, for example, the user taps on the right-hand side of the wristwatch  1 , the display unit  11  provides a display where the right-hand portion of the slime-like character is distorted. 
     In this manner, if the display unit  11  can display a given pattern, it is also possible to offer pleasure in changing the pattern in step with the action. 
     &lt;Power Save Process&gt; 
     The wristwatch  1  executes a power save process to minimize power consumption and make the operation last long with the battery  72 . Among the configurations of the wristwatch  1  described with reference to  FIG. 2 , the accelerometer  63  and the controller  66  consume relatively large standby power. 
     Hence, the accelerometer  63  adopts one where a sampling rate being a time interval for detecting acceleration can be selected from a plurality of sampling rates such as a low sampling rate and a high sampling rate. The accelerometer  63  is set in such a manner as to operate at the low sampling rate to reduce the power to be consumed. 
     On the other hand, the controller  66  has, as operating modes, an active mode where all functions are running in an executable manner, and a low power mode where only the input of a signal from the outside can be detected. The controller  66  is normally in the standby state in low power mode. Then, if the button operation on the push button  28  or the sensor output from the accelerometer  63  is detected, the operating mode of the controller  66  is changed to the active mode. 
     The power save process by the wristwatch  1  is described with reference to a flowchart of  FIG. 17 . 
     Incidentally, the controller  66  is assumed to be set in low power mode as an initial state before the power save process of  FIG. 17  is started. 
     Firstly in step S 21 , the controller  66  determines whether or not the button operation on the push button  28  or the sensor output from the accelerometer  63  has been detected. 
     If it is determined in step S 21  that the button operation or the sensor output has not been detected, the processing proceeds to step S 22 . The controller  66  continues executing the low power mode. 
     On the other hand, if it is determined in step S 21  that the button operation or the sensor output has been detected, the processing proceeds to step S 23 . The controller  66  changes the operating mode to the active mode. 
     Then, in step S 24 , the controller  66  controls the operation in accordance with the detection result. For example, if the button operation of starting the display pattern change mode, or more specifically, the operation of holding down the push button  28  for a fixed period of time, has been detected in step S 21 , the controller  66  starts the display pattern change mode as described as step S 2  of  FIG. 12 . Moreover, if, for example, the sensor output indicating that the user has performed the operation of looking at the wristwatch  1  has been detected in step S 21 , the controller  66  changes the display pattern of the display unit  11  in such a manner as to display the current time. 
     When control over the operation according to the detection result ends, the processing proceeds to step S 25 . The controller  66  changes the operating mode to the low power mode. 
     After step S 22  or S 25 , the processing returns again to step S 21  to repeat the above-mentioned processing. 
     The wristwatch  1  executes the above power save process; accordingly, the accelerometer  63  operates at the low sampling rate all the time, and the controller  66  is normally put in the standby state in low power mode capable of detecting only the input of a signal from the outside. Therefore, power consumption can be reduced. 
     &lt;Power Save Switching Process&gt; 
     When the battery capacity (residual voltage) of the battery  72  is decreased to or below a fixed level, the controller  66  receives a signal indicating as such from the residual voltage detection unit  73  to switch the display of the display unit  11  from a normal power mode to a power save mode for a display with less power consumed. 
       FIG. 18  illustrates an example of display control in power save mode. 
     Incidentally,  FIG. 18  illustrates an example where the display of the minute hand is updated every five minutes to make the drawing easier to see. 
     When the time has changed from 6:15 to 6:20, the controller  66  performs display control to turn off (hide) the display of the minute hand at 15 minutes and turn on (show) the display of the minute hand at 20 minutes in normal power mode. 
     In contrast, in power save mode, the controller  66  performs display control to maintain the display of the minute hand at 15 minutes and turn on the display of the minute hand at 20 minutes without performing control to turn off the display of the minute hand at 15 minutes as in a display state  181 . 
     When the time has changed to 6:20 to 6:25, the controller  66  performs display control to maintain the display of the minute hands at 15 minutes and 20 minutes and turn on the display of only the minute hand at 25 minutes as in a display state  182 . 
     Similarly, when the time has changed from 6:25 to 6:30, the controller  66  performs display control to turn on the display of only the minute hand at 30 minutes as in a display state  183 . 
     In this manner, in power save mode, the controller  66  displays (inversely drives) only the segment area  141  required to display the current time and does not delete (does not inversely drive) the segment area  141  used to display the previous time. Consequently, the number of the segment areas  141  to be driven is less in power save mode than in normal power mode; accordingly, power save display is achieved. 
     Moreover, in this manner, the face section  21  provides a display different from one in normal power mode such as that a plurality of minute hands is displayed at the same time. Accordingly, the user can grasp the fact that the battery capacity of the battery  72  has decreased to or below the fixed level. 
       FIG. 19  is a flowchart of the power save switching process of switching the display method of the display unit  11  according to the battery capacity of the battery  72 . 
     Firstly in step S 31 , the controller  66  uses a residual voltage detection signal supplied from the residual voltage detection unit  73  to determine whether or not the battery capacity of the battery  72  is at or below a predetermined level. 
     If it is determined in step S 31  that the battery capacity of the battery  72  is at or below the predetermined level, the processing proceeds to step S 32 . The controller  66  controls the display in power save mode. For example, the controller  66  controls the display in such a manner as described with reference to  FIG. 18 . Moreover, for example, as the display control in power save mode, the controller  66  may control the electrophoretic display  51  at a lower driving voltage than in normal power mode, and perform display control with low contrast. Alternatively, the display control in power save mode can also be set as display control where the rewriting frequency of the time display is lower than in normal power mode. 
     On the other hand, if it is determined in step S 31  that the battery capacity of the battery  72  is not at or below the predetermined level, the processing proceeds to step S 33 . The controller  66  performs the display control in normal power mode. 
     After the processing of step S 32  or S 33 , the processing returns again to step S 31  to execute the above-mentioned processing. 
     As described above, when the battery capacity of the battery  72  is at or below a fixed level, the wristwatch  1  can provide a power save display making use of the features of drive control over the electrophoretic display  51 , and also provide a display that allows the user to grasp the low voltage state. 
     Incidentally, the displays in normal power mode and power save mode can be those other than the above-mentioned examples. 
     For example, the wristwatch  1  may provide the above-mentioned normal watch mode display in normal power mode, and the above-mentioned action detection mode display in power save mode. 
     The display control in power save mode that allows the user to grasp the low voltage state may provide, for example, an afterimage-like display of the minute hands that displays a plurality of minute hands including a minute hand corresponding to the current time and one or more minute hands displayed before the current time. 
     2. Second Embodiment of Watch 
     Next, the second embodiment of the watch according to the present disclosure is described. 
       FIG. 20  illustrates a control block diagram related to display control over the wristwatch  1  in the second embodiment. 
     In  FIG. 20 , the same reference signs are assigned to parts corresponding to the first embodiment. Their descriptions are omitted as appropriate. 
     The second embodiment is different from the first embodiment in the point that the sensor  201  of a different type from the accelerometer  63 , and a communication unit  202  are newly provided in the control unit  41 . 
     The wristwatch  1  includes the sensor  201  of a different type from the accelerometer  63  to enable the detection of an event different from one detected by the accelerometer  63 , and a change in the display pattern of the display unit  11 . 
     If, for example, the sensor  201  is a temperature sensor that detects temperature, the controller  66  changes the display pattern of the display unit  11 , for example, displaying a specific pattern design according to the detected temperature. 
     If, for example, the sensor  201  is a humidity sensor that detects humidity, the controller  66  changes the display pattern of the display unit  11 , for example, displaying a specific pattern design according to the detected humidity. 
     If, for example, the sensor  201  is a pressure sensor that detects pulsations in the arm of the user, the controller  66  changes the display pattern of the display unit  11 , for example, displaying a specific pattern design according to the detected heart rate. The specific pattern design according to the heart rate can be a display that prompts the user to exercise caution. 
     If, for example, the sensor  201  is a brightness sensor that detects ambient brightness, the controller  66  changes the display pattern of the display unit  11 , for example, displaying a specific pattern design according to the detected lightness. Moreover, the tone of the display unit  11  may be changed according to lightness. 
     If, for example, the sensor  201  is an odor sensor that detects ambient odor, the controller  66  changes the display pattern of the display unit  11 , for example, displaying a specific pattern design according to the detected odor. 
     If, for example, the sensor  201  is an imaging sensor that captures an image of its surroundings, the controller  66  performs image recognition with the captured image to detect the direction of the line of sight of the user. The controller  66  then changes the display pattern of the display unit  11 , for example, displaying a specific pattern design according to the detected direction of the line of sight. When, for example, the user&#39;s line of sight is directed toward the wristwatch  1 , the controller  66  changes the display pattern of the display unit  11 . A detection target whose direction of the line of sight is detected may not be the user wearing the wristwatch  1  but another user in the vicinity. 
     If, for example, the sensor  201  is a touch sensor that detects the user&#39;s contact (touch), the controller  66  detects a touch operation, a stroking operation, a tracing operation, or the like, which was performed by the user on the wristwatch  1 , and changes the display pattern of the display unit  11  according to the detected operation. If the sensor  201  is a touch sensor, the touch sensor may be stacked on an upper surface of the display unit  11 , or may be placed at a position different from the display unit  11  such as a side surface portion of the wristwatch  1 , as with the push button  28 . 
     If, for example, the sensor  201  is a position detection sensor that can detect the location of the wristwatch  1 , such as a global positioning system (GPS), the controller  66  changes the display pattern of the display unit  11  according to the location of the user who is wearing the wristwatch  1 . 
     Moreover, if, for example, the controller  66  can acquire the location information of the wristwatch  1  worn by another user (for example, a friend) via the communication unit  202 , the controller  66  changes the display pattern of the display unit  11  according to the location of the other user. Consequently, if a friend of the user is near the user, the display pattern of the display unit  11  is changed to let the user know. 
     Furthermore, if the controller  66  can acquire item information that identifies an item (article) worn by another user (for example, a friend), such as a wristwatch or bag, together with the location information via the communication unit  202 , the display pattern of the display unit  11  is changed according to the acquired item information and location information. Consequently, if a person carrying the same item as the user&#39;s is near the user, the display pattern of the display unit  11  is changed to let the user know. 
     The sensor  201  can be one of the above-mentioned temperature sensor, humidity sensor, pressure sensor, brightness sensor, odor sensor, imaging sensor, touch sensor, position detection sensor, and the like. Moreover, the control unit  41  may include a plurality of the above-mentioned sensors  201  other than the accelerometer  63 . 
     The communication unit  202  is a communication device that communicates wirelessly with another communication device such as a smartphone in, for example, near field communication (NFC), infrared communication, or other wireless communication such as BLUETOOTH (registered trademark). In this case, the communication unit  202  communicates wirelessly with the other communication device, acquires data provided from the other communication device, and supplies the data to the controller  66 . 
     Moreover, the communication unit  202  may be a communication device that is connected to a network such as the Internet, a local area network (LAN), or a wide area network (WAN). In this case, the communication unit  202  connects to another communication device such as a server device via the network, acquires data provided from the other communication device, and supplies the data to the controller  66 . In other words, in the embodiment, the type of wireless communication used by the communication unit  202  is not limited, and a given type can be adopted. 
     For example, the communication unit  202  receives, from another communication device, design data corresponding to the display pattern of the display unit  11 , and supplies the received design data to the controller  66 . The controller  66  stores the design data acquired from the communication unit  202  in the storage unit  61 . 
     Therefore, if the wristwatch  1  has the communication function, the user can acquire (download), in the wristwatch  1 , design data different from the design data stored in advance in the storage unit  61 . Consequently, the display pattern of the wristwatch  1  can be changed to a display pattern different from the display patterns prepared in advance. 
     &lt;Configuration Example of Display Pattern Providing System&gt; 
     It is possible to construct, for example, a system where creators create and provide design data corresponding to display patterns that can be displayed on the wristwatch  1 , and the user of the wristwatch  1  purchases a desired display pattern that the user wants to display on his/her own wristwatch  1 . 
       FIG. 21  illustrates a configuration example of a display pattern providing system (communication system) that offers a design providing service that enables the giving and receiving of design data between a creator and the user. 
     The display pattern providing system is configured including at least a terminal apparatus  301  to be operated by the creator, a server  302  in which design data of display patterns provided by creators to the user is stored, and a terminal apparatus  303  into which the user downloads design data. In the display pattern providing system, in reality, many creators and users can use their own terminal apparatuses to access the server  302 . However, for simplicity of description, a case of one creator and one user is described. 
     Each of the terminal apparatuses  301  and  303  includes, for example, a personal computer (PC), a note PC, a tablet, or a smartphone, and has at least a network communication function. In the following description, the creator&#39;s terminal apparatus  301  is referred to as the creator terminal  301 , and the user&#39;s terminal apparatus  303  as the user terminal  303 . 
     The creator terminal  301 , the server  302 , and the user terminal  303  are connected via a network  304  such as the Internet, a local area network (LAN), or a wide area network (WAN). 
     The server  302  stores design data uploaded by creators, and also provides the user design data provided by many creators on the Web when the user accesses a predetermined address (URL) of the server  302 . In other words, the server  302  establishes an Internet shop that provides design data corresponding to display patterns of the wristwatch  1 . 
     A description is given of a design data providing process to be executed by the display pattern providing system of  FIG. 21  with reference to a flowchart of  FIG. 22 . 
     Incidentally, in the description of  FIG. 22 , a description is given assuming that the user terminal  303  is a smartphone, and the user terminal  303  and the wristwatch  1  communicate wirelessly with each other in NFC. 
     Firstly, the creator creates design data that can be displayed on the wristwatch  1 . Then, in step S 61 , the creator terminal  301  uploads (transmits) the design data created for the wristwatch  1  to the server  302  in accordance with an operation of the creator. 
     In step S 62 , the server  302  receives the design data transmitted from the creator terminal  301  to store the received design data in its internal storage unit. 
     In step S 63 , the user terminal  303  accesses a predetermined address of the server  302  through a browser or the like in accordance with the user&#39;s operation to access a site (Internet shop) that can browse and purchase design data created by many creators for the wristwatch  1 . 
     In step S 64 , the server  302  transmits a web page that displays a list of the display patterns created by the many creators for the wristwatch  1  to the user terminal  303  at the request of the browser of the user terminal  303 , and displays the list of the design data on a display of the user terminal  303 . 
     When the user looks at the list of the design data and performs an operation of purchasing a desired piece of the design data, an instruction to purchase the design data on which the purchase operation has been performed is transmitted from the user terminal  303  to the server  302  in step S 65 . 
     In step S 66 , the server  302  receives the instruction to purchase the design data from the user terminal  303 , and transmits the specified design data to the user terminal  303 . The user terminal  303  receives the design data transmitted from the server  302  and stores the design data in its internal storage unit. 
     Furthermore, in step S 67 , the server  302  transmits a purchase notification indicating the purchase of the design data of the creator to the creator terminal  301  that uploaded the purchased design data. 
     When transmitting the design data purchase notification to the creator terminal  301 , the server  302  can transmit purchaser information indicating what kind of user purchased the design data of the creator such as whether the user is male or female, and the user&#39;s generation (teens, twenties, or the like) on the basis of, for example, the user&#39;s login information and registration information. 
     Moreover, if the server  302  can acquire, for example, the location information of the user terminal  303 , for example, location information indicating where the design data of the creator was downloaded can also be provided to the creator. 
     The user performs an operation of bringing the wristwatch  1  desired to display a display pattern of the downloaded design data close to the user terminal  303 . The user terminal  303  determines whether or not the wristwatch  1  has been brought close to it in step S 68 , and repeats the processing of step S 68  until determining that the wristwatch  1  has been brought close to it. 
     Then, if it is determined in step S 68  that the wristwatch  1  has been brought close, the processing proceeds to step S 69 , and the user terminal  303  transmits the design data in wireless communication to the wristwatch  1 . 
     In step S 70 , the wristwatch  1  receives the design data transmitted in wireless communication from the user terminal  303  to store the design data in the storage unit  61 . 
     With the above processing, the new design data is stored in the storage unit  61  of the wristwatch  1 . Then, the above-mentioned display pattern change process is executed to enable the display of the display pattern based on the acquired new design data on the display unit  11 . 
     Incidentally, in this example, the description has been given assuming that the user purchases the design data of the creator. However, the system may be configured to allow the user to acquire and use design data for free. Moreover, in addition to the acquisition and use of design data designed by creators, the user of the wristwatch  1  may design a display pattern by himself/herself, and change the display pattern freely. In this case, the user of the wristwatch  1  designs a display pattern by himself/herself using, for example, an application incorporated in the user terminal  303 , and the design data is transmitted to the wristwatch  1  in, for example, wireless communication. 
     &lt;Example where Information Other than Display Pattern Corresponding to Design Data is Displayed&gt; 
     The electrophoretic display  51  of the display unit  11  includes the plurality of divided segment areas  141  corresponding to predetermined display patterns as described with reference to  FIG. 11 . 
     However, the electrophoretic display  51  may include a plurality of segment areas obtained by dividing the whole display area in a two-dimensional array form, and be configured to control the turning on/off of each individual divided segment area by thin film transistors (TFTs). If the electrophoretic display  51  includes such a two-dimensional array capable of active matrix control, the number of kinds of patterns that can be displayed on the display unit  11  can be increased. 
     Alternatively, only a part of the display area of the display unit  11 , for example, only a part of the area of the band section  22 , may be set as a two-dimensional array segment area capable of active matrix control. 
       FIG. 23  illustrates an example of the wristwatch  1  where part of the area of the band section  22  of the display unit  11  is set as a two-dimensional array segment area  351 . 
     As an example where the sensor  201  is, for example, a temperature sensor that detects temperature, a temperature (26° C.) detected by the sensor  201  is displayed in the two-dimensional array segment area  351 . 
     Moreover, as an example where the communication unit  202  connects to a server device that provides weather information via a network to acquire the weather information of a location where the user wearing the wristwatch  1  is, an image (mark) indicating the acquired weather information (fair, occasionally cloudy) is also displayed in the two-dimensional array segment area  351 . 
     Information such as date and a day of the week generally displayed as a wristwatch may be displayed in the two-dimensional array segment area  351 . 
     In this manner, the band section  22  of the wristwatch  1  is not limited to those simply displaying pattern designs of a band or a bracelet. Consequently, predetermined information can be displayed not only on the face section  21  but also on the band section  22  of the wristwatch  1 . Accordingly, a wide variety of information can be presented to the user. 
     Therefore, the wristwatch  1  of the above-mentioned embodiments can be said to be an information display apparatus that can display predetermined information not only on the face section  21  but also on the band section  22 . 
     Incidentally, in the present description, the steps described in the flowcharts do not necessarily need to be processed in chronological order, and may be executed in parallel or at necessary timings such as when a call is made, naturally including a case where the steps are executed in chronological order along the described sequence. 
     Moreover, the above-mentioned processes may be executed independently, or may be executed in parallel. 
     In the present description, the system indicates an assembly of a plurality of components (such as devices and modules (parts)) and whether or not all the components are in the same casing does not matter. Therefore, a plurality of devices housed in different casings and connected via a network, and one device in which a plurality of modules is housed in one casing are both the systems. 
     Embodiments of the present disclosure are not limited to the above-mentioned embodiments, and various modifications can be made within a range that does not depart from the gist of the present disclosure. 
     For example, a mode where all or part of the above-mentioned plurality of embodiments are combined can be adopted. 
     If, for example, the wristwatch  1  has a communication function, a configuration of cloud computing where a cloud server performs part of the processes described assumed to be performed by the wristwatch  1  can be adopted. 
     Moreover, each step described in the above-mentioned flowcharts can be shared and executed by a plurality of devices in addition to being executed by one device. 
     Furthermore, if one step includes a plurality of processes, the plurality of processes included in the one step can be shared and executed by a plurality of devices in addition to being executed by one device. 
     Incidentally, the effects described in the present description are mere illustrations and are not limited. There may be effects other than those described in the present description. 
     Incidentally, the present disclosure can also take the following configurations: 
     (1) An information display apparatus including: 
     a display unit including a time information presenting section for presenting at least time information, and a band section to be worn on an arm; and 
     a display control unit for changing a display of the display unit. 
     (2) The information display apparatus according to (1), wherein the display unit includes an electrophoretic display. 
     (3) The information display apparatus according to (1) or (2), wherein the display control unit changes the display of the display unit with design data selected from a plurality of pieces of design data. 
     (4) The information display apparatus according to (3), further including a storage unit for storing the plurality of pieces of design data. 
     (5) The information display apparatus according to (3) or (4), further including a selection unit for selecting one piece of design data from the plurality of pieces of design data. 
     (6) The information display apparatus according to any of (1) to (5), further including a communication unit for receiving, from another communication device, design data to be displayed on the display unit, wherein the display control unit changes the display of the display unit with the received design data. 
     (7) The information display apparatus according to any of (1) to (6), further including a sensor for detecting a state of the information display apparatus, wherein the display control unit changes a display of the time information presenting section with a detection result of the sensor. 
     (8) The information display apparatus according to (7), 
     wherein the sensor is an accelerometer, and 
     the display control unit changes the display of the time information presenting section with an inclined state of the information display apparatus. 
     (9) The information display apparatus according to (8), wherein upon the information display apparatus being determined to be in a horizontal state, the display control unit changes the display of the time information presenting section. 
     (10) The information display apparatus according to (7), 
     wherein the sensor is an accelerometer, and 
     upon a user wearing the information display apparatus being determined to have looked at the information display apparatus with the detection result of the sensor, the display control unit changes the display of the time information presenting section. 
     (11) The information display apparatus according to any of (7) to (10), 
     wherein the sensor is an accelerometer, and 
     the display control unit determines an action of a user on the information display apparatus with the detection result of the sensor to change the display of the time information presenting section. 
     (12) The information display apparatus according to any of (7) to (11), wherein the display control unit also changes a display of the band section together with the display of the time information presenting section. 
     (13) The information display apparatus according to any of (1) to (12), further including a residual voltage detection unit for detecting a residual voltage of a power supply of the information display apparatus, wherein the display control unit changes the display of the display unit with a detection result of the residual voltage detection unit. 
     (14) The information display apparatus according to (13), wherein upon the residual voltage of the power supply being at or below a predetermined level, the display control unit makes a change to a display that notifies a low voltage state. 
     (15) The information display apparatus according to any of (1) to (14), wherein a display of the band section is a display representing a pattern design. 
     (16) An information display method of an information display apparatus, including a display control unit of the information display apparatus changing a display of a display unit including a time information presenting section for presenting at least time information and a band section to be worn on an arm. 
     (17) A program for causing a computer to function as a display control unit for changing a display of a display unit including a time information presenting section for presenting at least time information and a band section to be worn on an arm. 
     (18) A communication system including: 
     an information display apparatus; and 
     a terminal apparatus, 
     wherein the information display apparatus includes
         a display unit including a time information presenting section for presenting at least time information, and a band section to be worn on an arm,   a display control unit for changing a display of the display unit, and   a communication unit for receiving, from the terminal apparatus, design data to be displayed on the display unit, and       

     the terminal apparatus transmits the design data to the communication unit. 
     REFERENCE SIGNS LIST 
     
         
           1  Wristwatch 
           11  Display unit 
           21  Face section 
           22  Band section 
           24  Rubber band 
           28  Push button 
           41  Control unit 
           51  Electrophoretic display 
           61  Storage unit 
           63  Accelerometer 
           66  Controller 
           67  Driving unit 
           73  Residual voltage detection unit 
           201  Sensor 
           202  Communication unit 
           302  Server 
           303  Terminal apparatus 
           351  Two-dimensional array segment area