JP5360420B2 - Electronic clock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic timepiece which performs a display control for preventing burn-in, according to the condition, by notifying a user of the reason that the electronic timepiece does not perform an ordinary display, with an appropriate display. <P>SOLUTION: In the electronic timepiece 1 including a display means 3 of memory properties, a control means for controlling the display means, and a temperature detecting means, the control means performs a display mode switching control which switches the display mode of the display means over to a first mode wherein the ordinary display 5A is performed and to a second mode wherein the reason that the ordinary display is not performed is displayed with a first visual expression, and the switching control of the display mode from the first mode to the second mode is performed in the case when the temperature detecting means detects a temperature lower than a given set temperature range in the first mode. In the second mode, display processing of the first visual expression wherein the display means is made to display (5B) some of the ordinary display in succession, in addition to the first visual expression, is performed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electronic timepiece and the like.

  In recent years, a display panel having a memory property that can hold an image even when the power is turned off has been developed and used in an electronic timepiece or the like. As a display panel having a memory property, an EPD (Electro Phoretic Display), that is, an electrophoretic display device, a memory-type liquid crystal display device, and the like are known.

  In the case of an electronic timepiece that displays time on a display panel having a memory property, a use temperature range (for example, −10 ° C. to 60 ° C.) capable of maintaining stable performance is generally defined. The invention of Patent Document 1 avoids use outside the operating temperature range by providing a cooling fan or a heater and forcibly performing temperature control.

JP-A-2005-202251

  However, it is not practical to add a cooling fan or the like with high power consumption in a product driven by a battery such as an electronic timepiece. Further, the addition of parts such as a cooling fan may cause a problem of an increase in manufacturing cost. Therefore, a function is required such as displaying a warning when the temperature of the environment in which the electronic timepiece is used (operating environment temperature) is outside the operating temperature range.

  For example, FIG. 9A shows that the display 500X including a warning message “TOO HOT! Use at 60 ° C. or lower” is continued on the display panel 300 when the conventional electronic timepiece 100 is used at a high temperature exceeding the operating temperature range. Is displayed. The warning sentence allows the user to grasp the situation and take measures such as lowering the operating environment temperature.

  However, generally, in an environment where the temperature is higher than the operating temperature range, burn-in may occur even for a relatively short time by displaying a fixed pattern such as the warning text. When the fixed pattern is displayed for a long time or repeatedly, the residual charge load is fixed and the afterimage is always visually recognized, which may cause a problem in product quality.

  For example, FIG. 9B shows an example when such a problem occurs. In FIG. 9B, the current time is displayed as black and 10:10 as a normal display, but the warning text is also light gray and visually recognized as an afterimage (500Y).

  Therefore, when the electronic timepiece is placed in an environment outside the operating temperature range, a method of immediately displaying the display panel in a single color can be considered. For example, FIG. 9C is an example of a single color display 500Z. Image sticking can be prevented by not displaying any fixed pattern.

  However, when the single color display continues, there is a problem that the basic function as an electronic timepiece is lost because the time is not displayed. In addition, for the user, there may be a problem that it is impossible to distinguish whether the reason for the single color display is outside the operating temperature range, the battery is exhausted, or due to a failure.

  The present invention has been made in view of such problems. According to some aspects of the present invention, when the electronic timepiece is used outside the set temperature range, etc., the reason why the electronic timepiece does not normally display is notified to the user by an appropriate display. It is possible to provide an electronic timepiece that performs display control and input control for preventing seizure.

(1) The present invention is an electronic timepiece including a memory-type display means, a control means for controlling the display means, and a temperature detection means for detecting temperature, wherein the control means displays the display means. The display mode is switched from the first mode to the second mode by switching the mode between the first mode for performing normal display and the second mode for displaying the reason for not performing the normal display by the first visual expression. The display mode switching control to the mode is performed when the temperature detecting unit detects a temperature lower than a predetermined set temperature range in the first mode, and the first visual mode is controlled in the second mode. In addition to the expression, a first visual expression display process for continuously displaying a part of the normal display on the display means is performed.

  The electronic timepiece according to the present invention performs appropriate control in consideration of both convenience as an electronic timepiece and quality problems due to printing.

  First, in an environment at a temperature lower than a set temperature range (for example, −10 ° C. to 60 ° C.), the contrast may be reduced, but the possibility of image sticking is low, and it is convenient to perform single color display in the same environment. It's not a good idea.

  Therefore, the electronic timepiece according to the present invention shows the reason why normal display is not performed in a low temperature environment lower than the set temperature range (that is, low temperature), and displays a part of the normal display. continue. At this time, by clarifying the reason, the user can avoid misunderstanding that the electronic watch is not displaying normally due to a failure, and the convenience of the watch can be improved by continuing to display part of the normal display. Improve.

  Here, the normal display in the first mode refers to a display including at least a time display. The display mode of the electronic timepiece is normally the first mode. In the memory type display device, the display device is operated only when each time information (for example, hour or minute) of the time display is updated, and the display can be continued without supplying power until the next update. . Therefore, power consumption can be significantly reduced by using a memory-type display device as compared with the case of using a display device that requires power supply even when maintaining a display like a general liquid crystal display device.

  The display mode of the present invention shifts from the first mode to the second mode when the temperature detecting means detects that the timepiece temperature has become lower than the set temperature range. The set temperature range may be a so-called operating temperature range of an electronic timepiece, or may be a temperature range selected according to another standard. Moreover, the set temperature range may be fixed in advance, for example, or may vary according to the environment or by operation.

  In the second mode, the control means displays a visual expression on the display means to indicate a low temperature state. This visual representation may be any of characters, messages, images, figures, patterns, colors, symbols, etc., or a combination thereof. Note that since the display means has a memory property, it is possible to continue displaying the low temperature state display even without power supply. With this visual representation, the user can easily grasp that the electronic watch is in a low temperature environment below the set temperature range, and take appropriate measures to eliminate the state, such as moving into a warm room. Can do.

  In the second mode of the present invention, a part of the normal display is continued. For example, in an electronic timepiece (digital timepiece) whose time is indicated exclusively by a memory-type display means, the basic function as an electronic timepiece is lost if the time display stops when the mode is shifted to the second mode. In this example, if the time display that is a part of the normal display is continuously displayed even in the second mode, the basic function as an electronic timepiece can be maintained and the convenience for the user is improved. In addition to the time display, a visual display (alarm display) for indicating on / off of an alarm or a continuous display of a visual expression (battery display) indicating the remaining battery level may be performed. This further improves convenience.

(2) The electronic timepiece includes an accepting unit that accepts an operation, and the accepting unit performs a process of accepting a given operation in the first mode, and the given operation in the second mode. It is not necessary to perform the process of accepting.

  According to the present invention, it is possible to avoid giving a user a misunderstanding that a failure has occurred by disabling a given operation on the reception unit in the first mode for normal display in the second mode. Here, when the receiving unit receives a given operation in the first mode, for example, the control unit may change the display mode from the current display content, or the lamp may be turned on / off. Alternatively, function setting such as prohibition of alarm audition may be performed.

  For example, when the user requests a change in the display mode as in the first mode, the redrawing of the display screen is extremely slow in an environment where the temperature is lower than the set temperature range. There is a risk of giving. Therefore, in the second mode, the first visual expression display process for displaying a part of the normal display on the display means in addition to the first visual expression is continued without changing the display mode performed in the first mode. Let This prevents misunderstandings for the user.

  As a specific example, it is possible to switch the city setting of the world time in 1 second in an environment within the set temperature range by pressing a specific button, but it takes 30 seconds in an environment lower than the set temperature range. If this is the case, the user is likely to have a suspicion of failure. Therefore, it is preferable for the user to continue the first visual expression display process in the second mode even when the specific button is pressed.

(3) In this electronic timepiece, the control unit simply displays the display mode of the display unit, a third mode in which the reason for not performing the normal display is displayed by a second visual expression, and the entire surface of the display unit. The display mode switching control for switching to the fourth mode for displaying in one color is performed, and the switching of the display mode from the first mode to the third mode is performed by the temperature detecting means in the first mode. When the temperature higher than the temperature range is detected, the display mode switching control from the third mode to the fourth mode is performed after the display mode shifts to the third mode in the third mode. A second visual expression display process is performed to display the second visual expression on the display means in the third mode after a predetermined time has elapsed, and the fourth mode During over de may perform single-color display processing for stopping the updating of the display after displaying the single color on the display means.

  According to the present invention, for example, in an environment where the temperature is higher than a preset temperature range set in advance, the reason why normal display is not performed (high temperature) is shown to the user, and an appropriate response is promoted. Then, a single color is displayed on the display means, and the display mode is changed to stop updating the display. This prevents the user from misunderstanding that the electronic timepiece does not perform normal display due to a failure, and prevents the display means from being burned in since the single color display is performed after a certain period of time.

  It is possible to prevent deterioration of the quality of the electronic timepiece by providing appropriate information and performing display control not only when the temperature is lower than the set temperature range but also under an environment where the temperature is higher than the set temperature range.

(4) In this electronic timepiece, the accepting unit may not perform the process of accepting the given operation in at least one of the third mode and the fourth mode.

  According to the present invention, in a first mode in which normal display is performed, a given operation on the accepting means such as changing the display mode from the current display content is invalidated in the third and fourth modes. It is possible to prevent the display screen from being burned by shifting to the fourth mode or maintaining the state of the fourth mode.

  In an environment where the temperature is higher than the set temperature range, it is necessary to prioritize prevention of burn-in of the display screen rather than following a given operation on the receiving means from the aspect of maintaining quality. Therefore, in the fourth mode, the single color display process is continued without changing the display format or the like performed in the first mode. Even in the third mode, the mode is immediately shifted to the fourth mode after the end of the second visual expression display process. This can prevent quality deterioration in the display unit of the electronic timepiece.

(5) In this electronic timepiece, the control unit performs display mode switching control for switching the display mode of the display unit to a fourth mode in which the entire surface of the display unit is displayed in a single color. The display mode switching control from the first mode to the fourth mode is performed when the temperature detecting unit detects a temperature higher than the set temperature range in the first mode, and in the fourth mode, the single color is controlled. After displaying the image on the display means, a single color display process for stopping the display update may be performed.

  According to the present invention, for example, in an environment where the temperature is higher than a preset temperature range, a single color is immediately displayed on the display means, and the display mode is shifted to stop updating the display. This can prevent the display means from being burned.

  Immediately shifting to a single color display without displaying a fixed pattern including a warning display reduces the possibility of burn-in of the display means.

(6) In this electronic timepiece, the reception unit may not perform the process of receiving the given operation in the fourth mode.

  According to the present invention, in the first mode in which the normal display is performed, the given operation on the accepting means such as changing the display mode from the current display content is invalidated in the fourth mode. By maintaining the state, it is possible to prevent the display screen from being burned.

  In an environment where the temperature is higher than the set temperature range, it is necessary to prioritize prevention of burn-in of the display screen rather than following a given operation on the receiving means from the aspect of maintaining quality. Therefore, in the fourth mode, the single color display process is continued without changing the display format or the like performed in the first mode.

(7) In this electronic timepiece, the control means may perform time display as the partial display in the second mode.

  According to the present invention, since the time display is continuously shown to the user even in an environment where the temperature is lower than a preset temperature range, the basic function as an electronic timepiece is not lost.

(8) In this electronic timepiece, the display means can display at least a first color, a second color, and an intermediate color between the first color and the second color, and the control means is in the third mode. The second visual expression may be displayed on the display means by the intermediate color.

  According to the present invention, in the environment where the temperature is higher than the set temperature range, the second visual expression indicating the high temperature to the user is displayed in an intermediate color, so that the second visual expression itself causes burn-in. Reduce fear. Since the display means is likely to be burned in an environment at a temperature higher than the set temperature range, the display of a low contrast (display with intermediate colors) is performed to make it difficult for the residual charge load to occur.

  Here, the first color and the second color are two colors that are basic colors that can be displayed at least by a memory-type display means such as EPD. For example, in a two-particle microcapsule type electrophoresis system, the dispersion liquid is colorless and transparent, and the electrophoretic particles are white or black. This type of electrophoretic display unit is capable of displaying at least two colors, with white or black as the basic colors. Black that is one color of the migrating particles may be assigned as the first color, and white may be assigned as the second color. At this time, the intermediate color is gray. The intermediate color is not limited to one gradation, and may be a plurality of gradations.

(9) In this electronic timepiece, the display means can display at least a first color and a second color, and the control means, when satisfying a given return condition in the second mode, Display mode switching control for switching to the first mode after first displaying the first color and then the second color on the entire surface of the display means may be performed.

  According to the present invention, the control means switches to the first mode when a given return condition, that is, a condition capable of performing normal display, is established. Before the normal display, the control means covers the entire surface of the display means. After making the first color, an initialization operation for making the second color may be performed.

  According to the present invention, as the initialization operation, for example, control is performed so that the entire surface is black after the entire surface is black before switching to the first mode. By performing the initialization operation, even in the second mode display, for example, even if there is a display in which the contrast is reduced or an afterimage or burn-in is generated, normal display is performed without being affected by these effects. be able to. In this example, the initialization operation may be performed so that the entire surface is white and then the entire surface is black.

(10) In the electronic timepiece, the control unit detects that the temperature detection unit detects a temperature within a return temperature range that is included in the set temperature range and has a temperature range narrower than the set temperature range. It may be a given return condition.

  According to the present invention, the temperature at which the temperature detection means returns to the first mode from the other display mode is set to a temperature within the return temperature range narrower than the set temperature range, so that the temperature detection means can detect the temperature near the boundary value of the set temperature range. Even when it is detected, it is possible to avoid repeating the transition between the display modes and to perform stable screen display.

FIG. 1A, FIG. 1B, FIG. 1C, and FIG. 1D are diagrams showing display examples of an electronic timepiece according to the first embodiment. FIG. 2A is a state transition diagram showing display mode switching in the first embodiment. FIG. 2B is a state transition diagram showing switching of the sub mode in the first mode. 1 is a block diagram of an electronic timepiece according to a first embodiment. The flowchart figure of the control in 1st Embodiment. The flowchart of the control in the modification of 1st Embodiment. FIG. 6A is a diagram illustrating a function example of the B button in the first mode in the first embodiment. FIG. 6B is a diagram illustrating a function example of the B button in the second mode in the first embodiment. FIG. 6C is a diagram showing an example of the function of the B button in the third mode in the first embodiment. The flowchart figure of control when there exists an external input in 1st Embodiment. The figure which shows the example of a display of the electronic timepiece in 2nd Embodiment. 9A, 9B, and 9C are diagrams showing display examples of a conventional electronic timepiece. FIG. 10A, FIG. 10B, and FIG. 10C are diagrams showing display examples of an electronic timepiece according to another modification of the first embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In the description of the second and subsequent embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

1. First Embodiment A first embodiment of the present invention will be described with reference to FIGS.

1.1. Display by electronic clock 1.1.1. External view of electronic timepiece FIG. 1A to FIG. 1D are front views of an electronic timepiece 1 of the present embodiment. In the present embodiment, the electronic timepiece 1 displays on the EPD (electrophoretic display device) 3 according to the display mode.

  In the present embodiment, there are four display modes from the first mode to the fourth mode. However, the third mode and the fourth mode may not be provided, or may be a display mode different from the present embodiment. A modified example of the present embodiment without the third mode and the fourth mode will be described later with reference to a flowchart (FIG. 5).

  Display 5A in FIG. 1A is a display example in the first mode, and display 5B in FIG. 1B is a display example in the second mode. The display 5C in FIG. 1C is a display example in the third mode, and the display 5D in FIG. 1D is a display example in the fourth mode. Here, the displays 5A to 5D in FIGS. 1A to 1D are displayed on the same EPD 3 physically.

  1A to 1D, the EPD 3 of the electronic timepiece 1 is fitted in the case 2. In addition, the case 2 is provided with a button 6 as a reception means for receiving an operation. In the present embodiment, three buttons A to C are provided, but any number of buttons may be provided or may not be provided. In the present embodiment, the button 6 including the button A, the button B, and the button C functions as a reception unit that receives an operation. For example, various modes of the electronic timepiece 1 may be selected when the user presses the button A, and the characters and numerical values may be changed in the forward direction and the reverse direction by the buttons B and C, respectively.

  The electronic timepiece 1 may use a primary battery such as a dry battery as a power source, or may have a solar battery that functions as a power generation means outside the figure. Further, the solar cell may receive light to generate power, and the generated power may be charged to the secondary battery before being used as a power source.

1.1.2. Normal display (first mode)
Normally, the display mode of the electronic timepiece 1 is a first mode in which a normal display 5A such as time information is displayed as shown in FIG. In the present embodiment, world time (LONDON 01:10), time (10:10), and key guidance (MODE (▼)) are displayed as the normal display 5A. Note that the contents of the normal display are not limited to this combination. For example, an alarm time or an icon representing the currently selected function may be displayed. The display of the time information displayed on the EPD 3 in the first mode is updated every minute or every hour. In addition, a refresh operation for maintaining contrast, rewriting for maintaining DC balance (for example, inversion of display) and the like are performed as necessary.

  The electronic timepiece 1 includes temperature detection means (not shown) for detecting the temperature of the timepiece. When the temperature detection means detects a temperature within a preset temperature range, the display mode of the electronic timepiece 1 remains in the first mode. Here, the set temperature range may be a use temperature range in which the electronic timepiece 1 can maintain stable performance, for example. In this embodiment, it is assumed that the set temperature range is −10 ° C. to 60 ° C.

1.1.3. Low temperature warning display (second mode)
However, when the temperature detection means detects a temperature lower than the set temperature range, the display mode of the electronic timepiece 1 shifts to the second mode in which a warning is displayed that the temperature is lower than −10 ° C. (C1). Then, in the second mode, if a return condition such as detecting a temperature within a preset temperature range is satisfied, the mode transitions to the first mode (C2). Details of the second mode will be described below.

  As shown in FIG. 1B, in this embodiment, the first visual expression (TOO COLD! −10 ° C.) indicates that normal display is not performed because the temperature is lower than the set temperature range in the second mode. Display 5B including “Please use above” is displayed on EPD3. The user can take appropriate measures such as moving the electronic timepiece 1 to a warm place by looking at the first visual expression. The first visual expression is not limited to a message or the like, and may be expressed by a graphic such as an icon.

  At this time, the EPD 3 that is a memory-type display device can continue to display the first visual expression without the input of the drive signal (control signal). Specifically, the visual representation continues to be displayed on the EPD 3 even when a voltage is not applied to the drive electrodes (for example, pixel electrodes and segment electrodes) and the common electrode of the EPD 3 and the high-impedance state is left. Therefore, even if the first visual expression is continuously displayed for a long time until the first mode is restored (C2), the power consumption can be kept low. Since the second mode is at a low temperature lower than the set temperature range, generally, there is a low possibility that image sticking will occur due to the first visual expression.

  In the present embodiment, the display 5B also displays the time (10:10) continuously from the first mode. That is, even in the second mode, the time display that is the basic function of the electronic timepiece is continuously performed. As a result, the basic function as an electronic timepiece can be maintained, and convenience is improved.

  When the display mode of the electronic timepiece 1 is in the second mode, for example, the temperature detection unit may transition to the first mode with a detection condition that a temperature within a preset temperature range is set (C2). . At this time, when the temperature detecting means detects a temperature in the vicinity of −10 ° C., there is a possibility of frequently transitioning between the first mode and the second mode. Therefore, the display mode of the electronic timepiece 1 may be changed stably by setting the threshold temperature of the return condition to a temperature (for example, −5 ° C.) higher than the lower limit value of the set temperature range.

1.1.4. High temperature warning display (3rd mode)
Furthermore, the electronic timepiece 1 may change to a display mode other than the first mode (in the present embodiment, the third mode or the fourth mode) when the temperature detection unit detects a temperature higher than the set temperature range. In brief, when the temperature detecting means detects a temperature higher than the set temperature range, the display mode of the electronic timepiece 1 shifts to a third mode for warning that the temperature is higher than 60 ° C. (C3). Then, when a predetermined time elapses in the third mode, the process proceeds to the fourth mode in which single color display is performed to prevent the EPD 3 from being burned (C4). In the fourth mode, if a return condition such as detecting a temperature within a preset set temperature range is satisfied, the mode transitions to the first mode (C5). Since the influence of the environment on the EPD 3 is particularly different between the case where the temperature is lower than the set temperature range and the case where the temperature is higher, it is preferable from the aspect of maintaining the quality of the electronic timepiece 1 to prepare display modes correspondingly.

  As shown in FIG. 1C, in the third mode, the second visual expression (TOO HOT! 60 ° C. or lower) indicates that normal display is not performed because the temperature is higher than the set temperature range. Display 5C is displayed on EPD3. The user can take appropriate measures such as moving the electronic timepiece 1 to a cool place by looking at the second visual expression. The second visual expression is not limited to a message or the like, and may be expressed by a graphic such as an icon.

  At this time, the EPD 3 can continue to display the second visual expression even if no drive signal (control signal) is input, as in the second mode. However, if the second visual expression is displayed continuously for a long time until the mode returns to the first mode (C5), the second visual expression may cause burn-in because it is in a high temperature environment higher than the set temperature range. There is. Therefore, in the present embodiment, priority is given to prevention of image sticking (quality assurance) of the EPD 3 over convenience as an electronic timepiece, and a single color display 5D is performed after a given time (for example, 1 minute) has passed after moving to the third mode. The process moves to the fourth mode (C4).

  In FIG. 1C, the second visual expression is a black message with a white background, but the message may be displayed in gray as an intermediate color. By performing the display with the intermediate color (gray), it is possible to make it difficult for the residual charge load to occur, and to further reduce the possibility of burn-in caused by the second visual expression. For the gradation of the intermediate color, for example, one gradation may be selected within a range where the visibility is not lost, or may be adjusted according to the situation (temperature change). When the temperature of the environment in which the electronic timepiece 1 is used rises rapidly (for example, 80 ° C.), priority is given to prevention of seizure (quality assurance) of the EPD 3 over visibility, and an intermediate color with a gradation close to the background color is used. The same message may be displayed.

1.1.5. Single color display (4th mode)
As shown in FIG. 1D, in the fourth mode, the entire surface of the EPD 3 is displayed in a single color. Thereafter, the single color display can be continued without the input of the drive signal (control signal). That is, the electronic timepiece 1 can maintain a single color display without consuming electric power. At this time, since a fixed pattern message or the like is not displayed at the same position on the EPD 3, no screen burn-in occurs even if the display mode is the fourth mode for a long time.

  When the display mode of the electronic timepiece 1 is in the fourth mode, for example, the temperature detection means may transition to the first mode with a detection condition that the temperature within the preset temperature range is detected (C5). . At this time, when the temperature detecting means detects a temperature around 60 ° C., there is a possibility of frequently transitioning between the first mode, the third mode, and the fourth mode. Therefore, the display mode of the electronic timepiece 1 may be stably changed by setting the threshold temperature of the return condition to a temperature (for example, 55 ° C.) lower than the upper limit value of the set temperature range.

  As shown in FIGS. 1 (A) to 1 (D), the electronic timepiece 1 performs the display 5A to 5D corresponding to the display mode, so that the reason why the electronic timepiece does not normally display to the user is appropriate. Display control can be performed and display control can be performed in consideration of burn-in prevention according to the situation.

  Here, FIGS. 10A to 10C show a modification of the electronic timepiece 1 according to the present embodiment shown in FIG. 10 (A) and 10 (B) are the same as FIGS. 1 (A) and 1 (B), respectively, and description thereof is omitted.

  The electronic timepiece 1 in FIG. 10 changes to the fourth mode without passing through the third mode when the temperature detecting means detects a temperature higher than the set temperature range. When the temperature detection means detects a temperature higher than the set temperature range, the display mode of the electronic timepiece 1 shifts to the fourth mode in which single color display is performed to prevent the EPD 3 from being burned (C3A). In the modification of FIG. 10, the effect of preventing the seizure of EPD 3 is higher than that of the embodiment of FIG. This is because the warning display in the third mode is not performed in order to further reduce the possibility of the EPD 3 being burned.

  Note that the electronic timepiece 1 (fourth mode) in the state of FIG. 10C is recovered by detecting a temperature within a preset temperature range as in the electronic timepiece 1 in the embodiment of FIG. If the condition is satisfied, the mode may be changed to the first mode (C5). Further, not only when transitioning to the first mode, but also the operation and properties in the fourth mode may be the same as those of the electronic timepiece 1 in the embodiment of FIG.

1.2. Transition diagram of display mode 1.2.1. During Normal Operation FIG. 2A is a diagram illustrating display mode transition in a state where the electronic timepiece 1 according to the present embodiment illustrated in FIG. 1 performs a normal function (during normal operation). Note that the switching of the display mode of the electronic timepiece 1 according to the present embodiment may be performed by control means such as the display control circuit 14 and the stop time counter 23 shown in FIG.

  The first to fourth modes (M1 to M4) which are display modes in FIG. 2A correspond to FIGS. 1A to 1D, respectively. The control means of the electronic timepiece 1 displays the displays 5A to 5D on the EPD 3 in the first to fourth modes (M1 to M4), respectively. The display mode transitions C1 to C5 are the same as C1 to C5 in FIG.

1.2.2. At Initialization Operation FIG. 2B is a diagram illustrating display mode transition when the initialization operation is performed, for example, when the electronic timepiece 1 is reset. After the initialization operation is performed in the initialization mode M11, the first mode is entered. The electronic timepiece 1 may include an initialization mode M11 in which only the initialization operation is performed in addition to the display modes (M1 to M4) during the normal operation in FIG.

  In the present embodiment, the EPD 3 uses a two-color powder fluid type electrophoretic layer in which an electrophoretic particle dispersion liquid in which black electrophoretic particles and white electrophoretic particles are dispersed is enclosed in microcapsules. Therefore, at least black can be displayed as the first color and white can be displayed as the second color. The EPD 3 display method may be a segment method or a dot matrix method using a TFT circuit or the like.

  In the initialization mode M11, for example, after a reset signal is input, an initialization operation is performed in which the entire surface of the EPD 3 is displayed in black with a single color and then the entire surface is displayed in white with a single color (see M11 in FIG. 8). ). As a result of this operation, the microcapsules are in conflict with each other on the entire surface of the EPD 3, so that the contrast is improved in the subsequent normal display. After the initialization operation is completed, the mode shifts to the first mode (C11). In the first mode, a normal display such as the display 5A of FIG. 1 is performed.

1.3. FIG. 3 is a block diagram of the electronic timepiece 1 according to the present embodiment. The switching of the display mode can be realized by the configuration of FIG. 3, for example.

  As shown in FIG. 3, the electronic timepiece 1 is turned on / off by an oscillation circuit 11, a frequency dividing circuit 12, a time counter 13, a display control circuit 14, an EPD 3, and buttons 6 (for example, button B and button C). Switches 15 and 16, a time correction circuit 17, a stop time counter 23, a temperature sensor 41, and a temperature detection circuit 42 are included. EPD3 corresponds to EPD3 in FIG. Note that, for example, a solar battery, a charge control circuit, a secondary battery, and the like may be provided, but in the present embodiment, a primary battery not shown is used as a power source.

  The oscillation circuit 11 oscillates a reference oscillation source such as a crystal resonator or a ceramic resonator at a high frequency to generate a reference oscillation signal.

  The frequency dividing circuit 12 divides the reference oscillation signal generated by the oscillation circuit 11 to generate a predetermined reference signal (for example, a signal of 1 Hz).

  The time counter 13 counts the reference signal generated by the frequency divider circuit 12 and measures the current time. Further, the time counter 13 may correct the counter value, that is, the current time information based on the time adjustment signal input from the time adjustment circuit 17.

  When the display control circuit 14 determines that the display mode is the first mode (M1 in FIG. 2), the display control circuit 14 controls the display of the EPD 3 based on the information of the current time measured by the time counter 13 to perform normal display. (5A in FIG. 1) is performed.

  If the display control circuit 14 determines that the display mode is the second mode (M2 in FIG. 2) based on the signal from the temperature detection circuit 42, the display control circuit 14 causes the EPD 3 to display the first visual expression or the like. A first visual expression display process is performed. In the present embodiment, the display control circuit 14 performs time display based on the current time information measured by the time counter 13 even in the second mode (5B in FIG. 1).

  When the display control circuit 14 determines that the display mode is the third mode (M3 in FIG. 2) based on the signal from the temperature detection circuit 42, the display control circuit 14 causes the EPD 3 to display the second visual expression. 2 visual expression display processing is performed. Thereafter, the display control circuit 14 displays the entire surface of the EPD 3 in a single color based on a signal (e.g., a control signal from the stop time counter 23) notifying the elapsed time since the display mode is changed to the third mode (see FIG. 1D 5D) to prevent screen burn-in.

  The display control circuit 14 also controls the display of the EPD 3 when it is determined that the display mode has returned from the second mode or the fourth mode to the first mode based on the signal from the temperature detection circuit 42. The normal display (5A in FIG. 1) is performed.

  The switches 15 and 16 are respectively input when the buttons B and C of the button 6 in FIG. 1 are pressed. In the present embodiment, the buttons B and C are associated with each other, but the present invention is not limited to this. The switches 15 and 16 function as input detection means for detecting the input of the buttons B and C that are reception means.

  The time adjustment circuit 17 outputs a time adjustment signal to the time counter 13 based on signals from the switches 15 and 16, that is, input operations of the buttons B and C.

  Here, signals from the switches 15 and 16 may also be input to the display control circuit 14. The display control circuit 14 may detect a predetermined operation of each of the buttons B and C, and may control the display of the EPD 3 by determining that the designated city has been changed, for example, at world time (see FIG. 6A). ).

  The number of switches is not limited to two, and there may be a switch corresponding to the button A. A signal from the switch may also be input to the time counter 13 and the display control circuit 14.

  The temperature sensor 41 is a sensor that detects the temperature of the environment in which the electronic timepiece 1 is used (use environment temperature). The temperature sensor 41 constitutes the temperature detection means of the present invention. The temperature sensor 41 directly or indirectly detects the usage environment temperature of the electronic timepiece 1. The temperature sensor 41 may measure the surface temperature of the EPD 3 or may measure the temperature around the electronic timepiece 1. The temperature sensor 41 may measure the internal temperature of a part of the electronic timepiece 1, and the temperature detection circuit 42 or the like may calculate the use environment temperature of the electronic timepiece 1 from the internal temperature.

  The temperature detection circuit 42 converts the temperature detected by the temperature sensor 41 into a signal in a format required by the display control circuit 14 (or stop time counter) and outputs the signal. For example, the temperature detection circuit 42 determines whether or not a predetermined threshold value (for example, an upper limit value or a lower limit value of the set temperature range) is exceeded, and displays a signal for requesting transition to the display mode according to the result. 14. It may be output to the stop time counter 23. Further, for example, the measured temperature information itself may be output to the display control circuit 14 and the stop time counter 23.

  When the stop time counter 23 determines that the mode is the third mode (M3 in FIG. 2) based on the signal from the temperature detection circuit 42, the stop time counter 23 measures the time to move to the fourth mode (M4 in FIG. 2). Operate the counter to be used. The stop time counter 23 may output, for example, the counter value to the display control circuit 14 or display control a control signal for informing the timing when the display mode shifts from the third mode to the fourth mode based on the counter value. It may be output to the circuit 14. The stop time counter 23 may be operated by inputting a clock (for example, a 1 Hz clock) from the frequency divider circuit 12.

1.4. Flow chart Fig. 1.4.1. Timekeeping process FIG. 4 is a flowchart of the control of the electronic timepiece 1 according to the present embodiment. First, S20 to S30 related to the timing process will be described.

  The time counter 13 determines whether there is a reference signal (for example, 1 Hz) input from the frequency divider circuit 12, that is, whether there is a second count (S20).

  If there is no second count in S20, a subroutine external input process S50 is executed, and then the process is continued. The external input process S50 will be described later.

  On the other hand, if there is a second count in S20, that is, if a reference signal is input, the time counter 13 counts up (S22).

  Next, the time counter 13 determines whether or not a minute carry has been performed (S30). That is, when the second counter of the time counter 13 reaches 60 seconds and the minute counter is counted up, it is determined that the minute carry has been performed.

  Here, when the minute carry is not performed, the process returns to S20 and the above processing is repeated.

1.4.2. Display Mode Control On the other hand, when the minute carry is performed in S30, the following steps relating to the display mode are performed. From here, it demonstrates along the transition of the display mode of FIG. The display stop mode (S90A) corresponds to the fourth mode. At this time, the EPD 3 is displayed in a single color (5D in FIG. 1). The low temperature display mode (S90B) corresponds to the second mode, and at this time, the EPD 3 displays a low temperature warning or the like (5B in FIG. 1). The high temperature warning display (S94A) corresponds to the third mode, and is displayed as 5C in FIG.

1.4.2.1. First Mode When the display mode of the electronic timepiece 1 is the first mode, that is, the normal display mode (N in S90A, N in S90B), the time and world time are updated according to the carry of the minute (S62).

  Next, the temperature detection circuit 42 determines whether the temperature t measured by the temperature sensor 41 is higher than the threshold value t2 (high temperature determination, S92A). When the temperature t is equal to or lower than the threshold t2 and the high temperature determination is passed (N in S92A), it is determined whether the temperature t is lower than the threshold t1 (low temperature determination, S92B). When the temperature t is equal to or higher than the threshold value t1 and the low temperature determination is also passed (N in S92B), the display mode remains in the first mode and the process returns to S20. Here, the threshold value t2 may be a high temperature side boundary temperature (for example, 60 ° C.) in the operating temperature range of the electronic timepiece 1, and the threshold value t1 may be a low temperature side boundary temperature (for example, −10 ° C.). However, it is not limited to these.

1.4.2.2. Transition from the first mode to the second mode The display mode of the electronic timepiece 1 changes from the first mode to the second mode when the temperature detection circuit 42 does not pass the low temperature determination, that is, the temperature t is a threshold value. This is a case of less than t1 (Y in S92B). At this time, the display control circuit 14 causes the EPD 3 to display a low temperature warning and time (S94B). Then, the display mode of the electronic timepiece 1 is set to the second mode (low temperature display mode) (S96B), and the process returns to S20.

1.4.2.3. Second Mode Even when the display mode of the electronic timepiece 1 is the second mode (low temperature display mode) (Y in S90B), the time is updated according to the minute carry (S64). However, unlike the first mode, a low temperature warning is displayed without displaying the world time and key guidance (see 5B in FIG. 1).

1.4.2.4. Transition from Second Mode to First Mode Next, the temperature detection circuit 42 determines whether or not the temperature t measured by the temperature sensor 41 is equal to or higher than the threshold value t1 + A1 (low temperature side return determination, S98B). When the temperature t is less than the threshold value t1 + A1 and the low temperature side return determination is not passed, the process returns to S20 again (N in S98B). Conversely, when the temperature t is equal to or higher than the threshold value t1 + A1 and the low temperature side return determination is passed (Y in S98B), the display control circuit 14 uses the time, the world time and the key guidance instead of the low temperature warning as EPD3. (S14B). Then, the display mode of the electronic timepiece 1 shifts from the second mode to the first mode (cancels the low temperature display mode, S100B), and returns to S20.

  Here, in the low temperature side return determination, the threshold is preferably not the same t1 as in the low temperature determination, but t1 + A1 in which hysteresis is added to t1 in order to avoid the influence of noise and the like. For example, if t1 is −10 ° C. and 5 ° C. is selected as A1, the threshold value in the low temperature side return determination is −5 ° C. Even when the temperature t fluctuates in the vicinity of −10 ° C., it is possible to avoid a state in which the display mode frequently changes between the first mode and the second mode and the display of the EPD 3 becomes unstable.

1.4.2.5. Transition from the first mode to the third mode The display mode of the electronic timepiece 1 changes from the first mode to the third mode when the temperature detection circuit 42 does not pass the high temperature determination, that is, the temperature t is a threshold value. This is a case where it is higher than t2 (Y in S92A). At this time, the display control circuit 14 displays a high temperature warning on the EPD 3 (S94A). At this time, the display mode of the electronic timepiece 1 is the third mode.

1.4.2.6. Transition from the third mode to the fourth mode When the display mode of the electronic timepiece 1 has changed to the third mode and one minute has elapsed (S68), the display control circuit 14 displays white in a single color on the entire surface of the EPD 3 (S70). Then, the display mode of the electronic timepiece 1 is set to the fourth mode (display stop mode) (S96A), and the process returns to S20.

1.4.2.7. Transition from the fourth mode to the first mode When the display mode of the electronic timepiece 1 is the fourth mode (display stop mode) (Y in S90A), the temperature detection circuit 42 uses the temperature t measured by the temperature sensor 41 as a threshold value. It is determined whether or not t2−A2 or less (high temperature side return determination, S98A). If the temperature t is higher than the threshold value t2-A2 and the high temperature side return determination is not passed, the process returns to S20 again (N in S98A). Conversely, when the temperature t is equal to or lower than the threshold value t2-A2 and the high temperature side return determination is passed (Y in S98A), the display control circuit 14 displays the time, world time, and key guidance on the EPD 3 (S14A). ). Then, the display mode of the electronic timepiece 1 shifts from the fourth mode to the first mode (cancels the display stop mode, S100A), and returns to S20.

  Here, also in the high temperature side return determination, as in the low temperature side return determination, it is preferable that the threshold is not the same t2 as in the high temperature determination but t2-A2 with hysteresis. For example, if t2 is 60 and 5 ° C is selected as A2, the threshold value in the high temperature side return determination is 55 ° C. Even when the temperature t fluctuates around 60 ° C., it is possible to avoid a state in which the display mode frequently changes between the first mode, the third mode, and the fourth mode, and the display of the EPD 3 becomes unstable.

1.5. Flow chart (Modification)
FIG. 5 is a flowchart of control of the electronic timepiece 1 according to a modification of the present embodiment. In this modification, the third mode and the fourth mode are not included. Therefore, the high temperature determination and the high temperature side return determination are not performed.

  In FIG. 5, the same steps as those in FIG. 4 are denoted by the same reference numerals, description thereof is omitted, and only differences are described. In the flowchart of the control of the electronic timepiece 1 according to the modification of the present embodiment, when the minute carry is performed in S30 (S30Y), it is immediately determined whether or not the second mode (low temperature display mode) is set. (S90C). In addition, when the display mode of the electronic timepiece is the first mode (N in S90C), only the low temperature determination (S92C) is performed after updating the time and the like (S62). The other steps are the same as in FIG. In this modification, a necessary circuit can be simplified by limiting to low temperature determination and low temperature side return determination, and a highly convenient electronic timepiece that can continuously display time and the like even at low temperatures can be provided.

1.6. Accepting Means FIGS. 6A to 6C are diagrams showing a function example of the B button (one of the buttons 6 in FIG. 1) which is one of accepting means for accepting an operation. 6A shows a case where the display mode of the electronic timepiece is the first mode, FIG. 6B shows a case where the display mode is the second mode, and FIG. 6C shows a case where the display mode is the third mode.

  FIG. 6A shows an example in which the world time is displayed in the normal display mode (first mode), and each time the button B is pressed, the city of the world time changes in ascending order. Before pressing the B button, the city of World Time is LONDON, but after pressing the B button, it changes to MOSCOW. In the first mode, the function expected for the B button as the accepting means is to change the city name and the local time, and the display mode of the EPD 3 screen changes from the display 5A to the display 5G. Further, for example, the display format may be changed such that the background changes or reverse display is performed.

  However, in FIG. 6B, the display mode is the second mode, and a low temperature warning is displayed on the EPD 3 (5B). At low temperatures, it takes time to redraw the screen due to the characteristics of EPD. For this reason, when an input requesting a display change is made as in the first mode, the user may misunderstand that the screen is changing so slowly that it is out of order.

  Therefore, in the present embodiment, when the display mode is the second mode, even if the B button is pressed as shown in FIG. 6B, the screen change request is not accepted, and the screen 5B does not change.

  In FIG. 6C, the display mode is the third mode, and a high temperature warning is displayed on the EPD 3 (5C). And, there is a high possibility that seizure will occur in the EPD 3 at a high temperature. For this reason, when an input requesting a display change or the like is performed as in the first mode, the time until the display of a single color (transition to the fourth mode) is accepted may be delayed. Then, seizure occurs in the EPD 3 and the quality of the electronic timepiece is deteriorated.

  Therefore, in this embodiment, even when the display mode is the third mode, even if the B button is pressed as shown in FIG. 6C, the screen change request is not accepted, and the screen 5C does not change. Even in the fourth mode in which single color display is performed, for the same reason as in the third mode, even if the B button is pressed, a screen change request is not accepted and the display screen does not change. In addition, the B button is used here as an example, but the same applies to the A button and the C button.

  In this embodiment, when the display mode of the electronic timepiece 1 is in the second to fourth modes, regardless of whether the screen has changed, it is assumed that the requested operation by the button is not accepted. However, even if the display mode of the electronic timepiece 1 is the second to fourth modes, a request by a button is required for a screen that does not change or is unlikely to be regarded as a failure of the electronic timepiece by the user. You may accept the action. For example, a button operation for stopping the alarm may be accepted because it is not related to the screen display.

1.7. Flow chart (external input processing)
FIG. 7 is a flowchart for external input processing of the electronic timepiece 1 of the present embodiment. This corresponds to the external input process S50 of FIGS. In this embodiment, as illustrated in FIG. 6, the button 6 (FIG. 1) that is an external input is used as an accepting unit that accepts an operation. Further, in the button 6, there is no difference in handling on the flowchart between the buttons A to C, and all follow the flowchart of FIG.

  First, it is determined whether or not there is an external input (S500). In the present embodiment, the external input corresponds to pressing the button 6 (buttons A to C). When the button 6 is not pressed, the display control circuit 14 does not perform any particular process (S500N).

  When the button 6 is pressed (S500Y), the display control circuit 14 determines whether or not it is in the low temperature display mode (second mode M2 in FIG. 2) (S502). Even in the low temperature display mode, the display control circuit 14 does not perform any particular processing (S502Y). This is because, when an external operation from the user is accepted, the reaction is slow, so that it is mistaken for a failure.

  When the display mode is not the low temperature display mode (S502N), the display control circuit 14 determines whether or not the high temperature display mode is selected (the third mode M3 in FIG. 2) (S504). Even in the high temperature display mode, the display control circuit 14 does not perform any particular processing (S504Y). If the time until a single color display is performed by accepting an external operation from the user (shifting to the fourth mode M4 in FIG. 2) is delayed, there is a possibility that the EPD 3 will be burned and the quality of the electronic timepiece may be deteriorated. It is.

  When the display mode is not the high temperature display mode (S504N), the display control circuit 14 determines whether or not the display stop mode (the fourth mode M4 in FIG. 2) is set (S506). Even in the display stop mode, the display control circuit 14 performs no particular processing for the same reason as in the high temperature display mode (S506Y).

  When the display stop mode is not set (S506N), the display mode is the normal display mode (first mode M1 in FIG. 2). At this time, the process according to the pressed button (S508) is performed and the external input process is completed. The process corresponding to the pressed button is, for example, that the B button is pressed with the world clock, and thus the city is advanced by one and the time of the city is displayed (see FIG. 6A).

  As described above, in this embodiment, no processing is performed even if the button is pressed in a display mode other than the normal display mode, so that the user is not suspected that the electronic timepiece 1 has failed and the display screen is not burned. it can.

  As a modification of the present embodiment, at least one of the high temperature display mode and the display stop mode may perform a given process in response to the button being pressed. For example, when a button is pressed in the display stop mode, the same warning as in the high temperature display mode is displayed for a certain period of time (for example, for several seconds) so that the user can use it within the set temperature range. You may be encouraged. Further, for example, when the button is pressed in the high temperature display mode, a process of forcibly shifting to the display stop mode may be performed. In these modified examples, a flowchart in which at least one of S504 and S506 is removed from the flowchart of FIG. 7 is used.

2. Second Embodiment A second embodiment of the present invention will be described with reference to FIG. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected, description is abbreviate | omitted, and a different part is demonstrated.

  FIG. 8 shows a display example of the electronic timepiece according to the present embodiment, and at the same time, transition of display modes including the initialization mode M11.

  The difference between the present embodiment and the first embodiment is that when the low temperature side return determination is passed (Y in S98B in FIG. 4) and the process proceeds to the first mode (C2A), the black color is transferred via the initialization mode M11. The single color display 5E and the white single color display 5F are performed at least once. The order of single color display may be white single color display first (C111) or black single color display first (C110). Further, the transitions C110 and C111 may be repeated a plurality of times. By performing the normal display 5A through the initialization mode M11, the normal display is affected even if, for example, the contrast is lowered or a display that may cause an afterimage or burn-in is displayed in the second mode display. Never give.

  Similarly, in the present embodiment, when the high temperature side return determination is passed (Y in S98A in FIG. 4) and the process proceeds to the first mode (C5A), the initialization mode M11 may be used.

  In the present embodiment, other parts are the same as those in the first embodiment.

3. Others In the above-described embodiments, the reason why normal display is not performed on the EPD 3 is displayed in characters (messages). However, as described above, it may be displayed in a visual expression such as an icon, a figure, a color, or a flag. . That is, it is only necessary to display content that allows the user to understand why the display is not normal.

  In each of the above embodiments, the EPD 3 may perform black and white two-particle electrophoresis using black particles and white particles, or may perform one-particle electrophoresis such as blue and white. A combination is also acceptable.

  The memory display means is not limited to the EPD 3 and may be a display having other memory characteristics. For example, an ECD (Electrochromic Display), a ferroelectric liquid crystal display, a cholesteric liquid crystal display, or the like may be used.

Furthermore, the electronic timepiece of the present invention is not limited to a wristwatch and can be widely applied to devices having a clock function such as a table clock, a wall clock, and a pocket watch.

  The present invention is not limited to these exemplifications, and includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 2 ... Case, 3 ... EPD (electrophoretic display device), 5A ... (Normal) display, 5B-5G ... Display, 6 ... Button, 11 ... Oscillation circuit, 12 ... Dividing circuit, 13 ... Timekeeping Counter, 14 ... Display control circuit, 15 ... Switch, 16 ... Switch, 17 ... Time adjustment circuit, 23 ... Stop time counter, 41 ... Temperature sensor, 42 ... Temperature detection circuit, M1 ... First mode, M2 ... Second mode , M3 ... third mode, M4 ... fourth mode, M11 ... initialization mode

Claims (10)

An electronic timepiece comprising memory-type display means, control means for controlling the display means, and temperature detection means for detecting temperature,
The control means includes
A display mode switching control is performed to switch the display mode of the display means between a first mode for performing normal display and a second mode for displaying the reason for not performing the normal display by a first visual expression,
The display mode switching control from the first mode to the second mode is performed when the temperature detection unit detects a temperature lower than a given set temperature range in the first mode,
In the second mode, in addition to the first visual expression, an electronic timepiece performing a first visual expression display process in which a part of the normal display is continuously displayed on the display means. The electronic timepiece according to claim 1,
Including accepting means for accepting operations,
The accepting means is
In the first mode, a process of accepting a given operation is performed,
An electronic timepiece that does not perform a process of accepting the given operation in the second mode. The electronic timepiece according to claim 2,
The control means includes
A display mode for switching the display mode of the display means between a third mode for displaying the reason for not performing the normal display by a second visual expression and a fourth mode for displaying the entire surface of the display means in a single color. Switch control,
The display mode switching control from the first mode to the third mode is performed when the temperature detecting unit detects a temperature higher than the set temperature range in the first mode,
The display mode switching control from the third mode to the fourth mode is performed after a given time has elapsed since the display mode shifted to the third mode in the third mode,
Performing a second visual expression display process for displaying the second visual expression on the display means in the third mode;
In the fourth mode, an electronic timepiece that performs a single color display process for stopping the update of the display after displaying the single color on the display means. The electronic timepiece according to claim 3,
The accepting means is
An electronic timepiece that does not perform a process of accepting the given operation in at least one of the third mode and the fourth mode. The electronic timepiece according to claim 2,
The control means includes
Performing display mode switching control for switching the display mode of the display means to a fourth mode for displaying the entire surface of the display means in a single color;
The display mode switching control from the first mode to the fourth mode is performed when the temperature detecting unit detects a temperature higher than the set temperature range in the first mode,
In the fourth mode, an electronic timepiece that performs a single color display process for stopping the update of the display after displaying the single color on the display means. The electronic timepiece according to claim 5,
The accepting means is
An electronic timepiece that does not perform a process of accepting the given operation in the fourth mode. The electronic timepiece according to any one of claims 1 to 6,
The control means includes
An electronic timepiece that performs time display as the partial display in the second mode. The electronic timepiece according to any one of claims 3 to 5,
The display means includes
At least a first color, a second color, and an intermediate color between the first color and the second color can be displayed;
The control means includes
An electronic timepiece that displays the second visual expression on the display means by the intermediate color in the third mode. The electronic timepiece according to claim 1,
The display means includes
At least a first color and a second color can be displayed;
The control means includes
In the second mode, when a given return condition is satisfied, the first color and then the second color are first displayed on the entire surface of the display means, and then the display mode is switched to the first mode. Electronic clock that controls switching. The electronic timepiece according to claim 9,
The control means includes
The electronic timepiece according to which the given return condition is that the temperature detection means detects a temperature within a return temperature range that is included in the set temperature range and has a temperature range narrower than the set temperature range.

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