Patent Publication Number: US-2023133086-A1

Title: Display control device, display control method, and recording medium

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application is based on and claims priority of Japanese Patent Application No. 2021-176685 filed on Oct. 28, 2021. 
    
    
     FIELD 
     The present disclosure relates to a display control device, a display control method, and a recording medium. 
     BACKGROUND 
     There are conventionally displays that are disposed in vehicles and notify information to users such as the drivers of the vehicles. 
     Patent Literature 1 (PTL 1) discloses a driving assistance device that causes a display to display a guidance image for instructing a driver to hold a steering wheel before a vehicle switches from an autonomous driving mode to a manual driving mode. 
     Patent Literature 2 (PTL 2) discloses an autonomous-driving control device that provides switching guidance to instruct the driver of a vehicle to switch from an autonomous driving mode to a manual driving mode and performs driving assistance control until predetermined conditions are satisfied after completion of switching to the manual driving mode. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] 
     Japanese Unexamined Patent Application Publication No. 201 9-10929 
     [PTL 2] 
     SUMMARY 
     However, the driving assistance device according to PTL 1 and the autonomous-driving control device according to PTL 2 can be improved upon. 
     In view of this, the present disclosure provides a display control device, a display control method, and a recording medium that are capable of improving upon the above related art. 
     A display control device according to one aspect of the present disclosure performs display control on the first display and the second display of a vehicle, the second display being different from the first display. The display control device includes an obtainer and a display controller. The obtainer obtains switching information indicating that switching between driving modes including an autonomous driving mode and a manual driving mode is to be performed in the vehicle. The display controller causes, before completion of first switching, (i) the first display to display first information and third information and (ii) the second display to display second information when the switching information indicates that the first switching is to be performed, the first switching being switching from the autonomous driving mode to the manual driving mode, the first information indicating that the first switching is to be performed, the second information being information for assisting the user of the vehicle in driving in the manual driving mode, the third information indicating that the second display is displaying the second information. 
     A display control method according to another aspect of the present disclosure is a method for performing display control on the first display and the second display of a vehicle, the second display being different from the first display. The display control method includes obtaining switching information indicating that switching between driving modes including an autonomous driving mode and a manual driving mode is to be performed in the vehicle and causing, before completion of first switching, (i) the first display to display first information and third information and (ii) the second display to display second information when the switching information indicates that the first switching is to be performed, the first switching being switching from the autonomous driving mode to the manual driving mode, the first information indicating that the first switching is to be performed, the second information being information for assisting the user of the vehicle in driving in the manual driving mode, the third information indicating that the second display is displaying the second information. 
     In addition, a recording medium according to still another aspect of the present disclosure is a non-transitory computer-readable recording medium having stored thereon a program for causing a computer to execute the display control method according to one aspect of the present disclosure. 
     It should be noted that these general or specific aspects may be embodied as a system, a method, an integrated circuit, a computer program, or a recording medium, such as a computer-readable CD-ROM, or may be embodied as any combination of the system, the method, the integrated circuit, the computer program, and the recording medium. 
     Further improvements can be made by using, for example, the display control device according to one aspect of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       These and other advantages and features of the present disclosure will become apparent from the following description thereof taken in conjunction with the accompanying drawings that illustrate a specific embodiment of the present disclosure. 
         FIG.  1    schematically illustrates the interior of a vehicle according to an embodiment. 
         FIG.  2    is a block diagram illustrating a configuration of a display system including a display control device according to the embodiment. 
         FIG.  3    illustrates an example of a vehicle driving scene. 
         FIG.  4    illustrates examples of information items displayed on displays. 
         FIG.  5 A  illustrates a first example of images displayed on the displays. 
         FIG.  5 B  illustrates the first example of images displayed on the displays. 
         FIG.  5 C  illustrates the first example of images displayed on the displays. 
         FIG.  5 D  illustrates the first example of images displayed on the displays. 
         FIG.  5 E  illustrates the first example of images displayed on the displays. 
         FIG.  5 F  illustrates the first example of images displayed on the displays. 
         FIG.  6 A  illustrates a second example of images displayed on the displays. 
         FIG.  6 B  illustrates the second example of images displayed on the displays. 
         FIG.  6 C  illustrates the second example of images displayed on the displays. 
         FIG.  6 D  illustrates the second example of images displayed on the displays. 
         FIG.  6 E  illustrates the second example of images displayed on the displays. 
         FIG.  7    is a sequence diagram illustrating an example of operation of the display system. 
         FIG.  8 A  illustrates examples of information items displayed on displays according to Variation 1. 
         FIG.  8 B  illustrates examples of information items displayed on the displays according to Variation 1. 
         FIG.  9    illustrates examples of information items displayed on displays when fourth information according to Variation 2 is displayed. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     (Underlying Knowledge Forming the Basis of the Present Disclosure) 
     In the related art, even if a guidance image is displayed and a user is notified that the driving mode of a vehicle will be switched to a manual driving mode, the user may drive the vehicle while not being fully aware of the driving mode of the vehicle or the situation surrounding the vehicle. Thus, it is difficult for the user to properly drive the vehicle soon after the driving mode is switched from an autonomous driving mode to the manual driving mode. 
     The inventors of the present disclosure arrived at creating a display control device, a display control method, and a recording medium that can assist a user in properly driving a vehicle soon after the driving mode is switched from an autonomous driving mode to a manual driving mode. 
     A display control device according to one aspect of the present disclosure performs display control on the first display and the second display of a vehicle, the second display being different from the first display. The display control device includes an obtainer and a display controller. The obtainer obtains switching information indicating that switching between driving modes including an autonomous driving mode and a manual driving mode is to be performed in the vehicle. The display controller causes, before completion of first switching, (i) the first display to display first information and third information and (ii) the second display to display second information when the switching information indicates that the first switching is to be performed, the first switching being switching from the autonomous driving mode to the manual driving mode, the first information indicating that the first switching is to be performed, the second information being information for assisting the user of the vehicle in driving in the manual driving mode, the third information indicating that the second display is displaying the second information. 
     Thus, by displaying the two information items, the first information and the third information, on the first display, it is possible to notify the driver that the first switching will be performed and that the second display is displaying the second information useful for driving the vehicle in the manual driving mode. The first display is caused to display the third information, and the second display is caused to display the second information. Thus, displaying of the third information guides the gaze of the user to the second display, which enables the user to visually check the second information. In this manner, the user can be aware that the first switching will be performed and aware of the second information useful for driving in the manual driving mode at the time of the switching. Accordingly, the user can properly drive the vehicle soon after the driving mode is switched from the autonomous driving mode to the manual driving mode. 
     In addition, the third information may indicate the position of an area displaying the second information. 
     Thus, the user can readily identify the position of the area displaying the second information. Accordingly, the user can readily visually check the second information. 
     In addition, the obtainer may obtain gaze information indicating the gaze of the user. The second information may include notices. When the second display is displaying the notices, the display controller may identify, according to the gaze of the user indicated by the gaze information, a notice displayed in an area at which the gaze of the user is directed and cause the second display to hide the notice identified. 
     Thus, the display status of the notice presumably looked at and checked by the user is changed to hide, which can reduce inconvenience caused by the notices being displayed. 
     In addition, in a period until the completion of the first switching, the display controller may change the display style of at least one of the first information, the second information, and the third information from a first display style to a second display style. 
     Thus, it is possible to notify, in stages, the user that the timing of the switching from the autonomous driving mode to the manual driving mode is approaching. Accordingly, the user can be aware of the time taken to switch to the manual driving mode. 
     In addition, when the obtainer obtains, before the completion of the first switching, new switching information indicating that second switching is to be performed, the display controller may cause, before completion of the second switching, the first display to display fourth information indicating that the second switching is to be performed, the second switching being switching from the manual driving mode to the autonomous driving mode. 
     Thus, the user can be aware that the driving mode will return to the autonomous driving mode. 
     In addition, in a period until the completion of the first switching, the display controller may change the display style of at least one of the first information, the second information, and the third information from a first display style to a second display style. The obtainer obtains, before the completion of the first switching, new switching information indicating that second switching which is switching from the manual driving mode to the autonomous driving mode is to be performed. In this case, before completion of the second switching, the display controller may (i) cause the first display to display fourth information indicating that the second switching is to be performed and (ii) change the display style of at least one of the first information, the second information, and the third information from the second display style to the first display style. 
     Thus, the user can be aware of the time taken to return to the autonomous driving mode. 
     In addition, the first display may be a head-up display, and the second display may be a display mounted on the dashboard of the vehicle. 
     Thus, the user can look at the first display while looking forward (looking at the area ahead of the vehicle). Accordingly, the user can readily check the first information and the third information while preparing for driving. In addition, by looking at the second display mounted on the dashboard, the user can visually check the second information. 
     In addition, a display control method according to another aspect of the present disclosure is a method for performing display control on the first display and the second display of a vehicle, the second display being different from the first display. The display control method includes obtaining switching information indicating that switching between driving modes including an autonomous driving mode and a manual driving mode is to be performed in the vehicle and causing, before completion of first switching, (i) the first display to display first information and third information and (ii) the second display to display second information when the switching information indicates that the first switching is to be performed, the first switching being switching from the autonomous driving mode to the manual driving mode, the first information indicating that the first switching is to be performed, the second information being information for assisting the user of the vehicle in driving in the manual driving mode, the third information indicating that the second display is displaying the second information. 
     Thus, by displaying the two information items, the first information and the third information, on the first display, it is possible to notify the driver that the first switching will be performed and that the second display is displaying the second information useful for driving the vehicle in the manual driving mode. The first display is caused to display the third information, and the second display is caused to display the second information. Thus, displaying of the third information guides the gaze of the user to the second display, which enables the user to visually check the second information. In this manner, the user can be aware that the first switching will be performed and aware of the second information useful for driving in the manual driving mode at the time of switching. Accordingly, the user can properly drive the vehicle soon after the driving mode is switched from the autonomous driving mode to the manual driving mode. 
     It should be noted that these general or specific aspects may be embodied as a system, a method, an integrated circuit, a computer program, or a non-transitory recording medium, such as a computer-readable CD-ROM, and may be embodied by any combination of the system, the method, the integrated circuit, the computer program, and the non-transitory recording medium. 
     An embodiment is described below in detail with reference to the drawings. 
     It should be noted that the embodiment described below shows general or specific examples. The numerical values, shapes, materials, structural elements, positions and connections of the structural elements, steps, order of the steps, and other descriptions provided in the embodiment below are mere examples and are not intended to limit the present disclosure. In addition, among the structural elements included in the embodiment below, the structural elements not included in the independent claims, which represent superordinate concepts, are described as optional structural elements. In addition, the drawings are schematic views and are not necessarily precisely drawn. Thus, for instance, scales in the drawings are not necessarily the same. In the drawings, identical structural elements are assigned the same reference symbols. 
     Embodiment 
     [Configuration] 
       FIG.  1    schematically illustrates the interior of vehicle  10  according to an embodiment. 
     Display control device  100  controls displays to control images displayed on the displays. In the embodiment, display control device  100  controls display  500 , display  510 , and display  520 . That is, display control device  100  performs display control on displays  500 ,  510 , and  520  of vehicle  10 . Displays  500 ,  510 , and  520  are different devices. 
     Each of displays  500 ,  510 , and  520  displays an image output by display control device  100 . Display control device  100  creates image  600 , image  610 , and image  620  on the basis of information items obtained by driving assistance device  200  and object detection device  300  and causes display  500 , display  510 , and display  520  to display image  600 , image  610 , and image  620 , respectively. In this manner, a user, such as a driver, is notified of information items included in images  600 ,  610 , and  620 . The information items notified to the user include, for example, information for assisting the user in driving vehicle  10 . 
     It should be noted that as long as displays  500 ,  510 , and  520  can display an image, each display may be any display, such as a liquid-crystal display or a head-up display (HUD), and is not limited to a particular display. In the embodiment, display  500  is a HUD. In the embodiment, display  510  and display  520  are liquid-crystal displays. 
     Vehicle  10  is a vehicle, such as an automobile or a motorcycle, and an automobile in the embodiment. It should be noted that vehicle  10  may be, for example, a ship or an aircraft. 
       FIG.  2    is a block diagram illustrating a configuration of display system  1  including display control device  100  according to the embodiment. 
     Display system  1  includes display control device  100 , driving assistance device  200 , object detection device  300 , location detection device  350 , gaze detection device  400 , displays  500 ,  510 , and  520 , and sound device  530 . Display system  1  is included in vehicle  10 . 
     A configuration of driving assistance device  200  is described below. 
     Driving assistance device  200  includes autonomous-driving determination unit  210 , driving switching unit  220 , and driving controller  230 . Driving assistance device  200  is a controller that performs control to assist the user in driving. 
     Autonomous-driving determination unit  210  determines whether vehicle  10  can drive in an autonomous driving mode, according to, for example, the driving state of vehicle  10  and the situation surrounding vehicle  10 . Autonomous-driving determination unit  210  may determine whether vehicle  10  can drive in the autonomous driving mode, according to, for example, the driving state of vehicle  10  and the situation surrounding vehicle  10  which are predicted to appear after a predetermined time period. Specifically, if vehicle  10  is predicted to pass, after a predetermined time period, a road junction in a driving route and given points before and after the road junction, autonomous-driving determination unit  210  may determine that vehicle  10  cannot drive in the autonomous driving mode after the predetermined time period. Autonomous-driving determination unit  210  repeatedly determines whether vehicle  10  can drive in the autonomous driving mode at predetermined time intervals and outputs determination results to driving switching unit  220 . 
     Regarding determination results by autonomous-driving determination unit  210 , when a transition is made from a result showing that vehicle  10  cannot drive in the autonomous driving mode to a result showing that vehicle  10  can drive in the autonomous driving mode, driving switching unit  220  switches the driving mode of vehicle  10  from the manual driving mode to the autonomous driving mode after a predetermined time period. Thus, driving switching unit  220  causes driving controller  230  to start the autonomous driving mode of vehicle  10  after the predetermined time period. It should be noted that the timing at which driving switching unit  220  causes driving controller  230  to start the autonomous driving mode is not limited to the time point at which the predetermined time period has passed and may be the timing at which the transition to the result showing that vehicle  10  can drive in the autonomous driving mode is made. 
     Here, regarding the determination results by autonomous-driving determination unit  210 , the transition is made from the result showing that vehicle  10  cannot drive in the autonomous driving mode to the result showing that vehicle  10  can drive in the autonomous driving mode. In this case, the latest determination result obtained from autonomous-driving determination unit  210  shows that vehicle  10  can drive in the autonomous driving mode, and the determination result obtained from autonomous-driving determination unit  210  just before the obtainment of the latest determination result shows that vehicle  10  cannot drive in the autonomous driving mode. 
     Regarding the determination results by autonomous-driving determination unit  210 , when a transition is made from the result showing that vehicle  10  can drive in the autonomous driving mode to the result showing that vehicle  10  cannot drive in the autonomous driving mode, driving switching unit  220  switches the driving mode of vehicle  10  from the autonomous driving mode to the manual driving mode after a predetermined time period. Thus, driving switching unit  220  causes driving controller  230  to end the autonomous driving mode of vehicle  10  after the predetermined time period. 
     Here, regarding the determination results by autonomous-driving determination unit  210 , the transition is made from the result showing that vehicle  10  can drive in the autonomous driving mode to the result showing that vehicle  10  cannot drive in the autonomous driving mode. In this case, the latest determination result obtained from autonomous-driving determination unit  210  shows that vehicle  10  cannot drive in the autonomous driving mode, and the determination result obtained from autonomous-driving determination unit  210  just before the obtainment of the latest determination result shows that vehicle  10  can drive in the autonomous driving mode. 
     In addition, when switching between the driving modes, driving switching unit  220  outputs, to display controller  120 , switching information indicating that switching between the driving modes will be performed. For instance, when switching from the manual driving mode to the autonomous driving mode (when performing a second switching), driving switching unit  220  outputs, to display control device  100 , switching information indicating that the driving mode will be switched to the autonomous driving mode. The switching information in this case includes the timing of the switching to the autonomous driving mode. For instance, when switching from the autonomous driving mode to the manual driving mode (when performing a first switching), driving switching unit  220  outputs, to display control device  100 , switching information indicating that the driving mode will be switched to the manual driving mode. The switching information in this case includes the timing of the switching to the manual driving mode. 
     Driving controller  230  drives vehicle  10  in the autonomous driving mode by controlling devices, such as the engine (motor), brakes, and steering of vehicle  10  which are parts for driving, by using the results of object detection device  300  detecting objects around vehicle  10 , map data, a scheduled driving route to a destination, and driving location information. The driving location information is used to identify the location of vehicle  10  on the driving route. The scheduled driving route to the destination is a scheduled driving route for vehicle  10  determined by the user by using a car navigation system (not illustrated). For example, the user inputs the destination to the car navigation system. The results of detecting the objects are used, for example, to avoid obstacles on the scheduled driving route for vehicle  10 . 
     Object detection device  300  is described below. 
     Object detection device  300  detects objects around vehicle  10  and outputs the results of detecting the objects to driving assistance device  200 . The objects around vehicle  10  include, for example, a vehicle driving in a surrounding area of vehicle  10 , a pedestrian, and other obstacles. For instance, object detection device  300  detects an object within a predetermined distance from vehicle  10 . For instance, object detection device  300  may detect an object by taking an image of at least a part of the surroundings of vehicle  10  by using a camera and identifying the object in the image by using a machine learning model to detect an object. Object detection device  300  may be a device, such as a light detection and ranging (LiDAR), that detects the distance to an object in the following manner. Object detection device  300  emits laser beams, which then reach an object and reflects back to object detection device  300 . By measuring the round-trip travel time of the laser beams between object detection device  300  and the object, object detection device  300  detects the distance to the object. Object detection device  300  may be a combination of a device that identifies an object from an image taken by a camera and a device that detects an object from the detection result of a LiDAR. That is, object detection device  300  is embodied as a device including a camera and a computer that performs processing to identify an object from an image taken by the camera, a device including a LiDAR and a computer that performs processing to analyze the detection result of the LiDAR and detect an object, or a device made by combining the above-mentioned devices. 
     Location detection device  350  is described below. 
     Location detection device  350  detects the location (driving location) of vehicle  10  and outputs, to driving assistance device  200 , driving location information that is the result of detection. The driving location information is, for example, location information indicating the current location of vehicle  10  and obtained by receiving a signal from a satellite positioning system (not illustrated), such as a global positioning system (GPS). Location detection device  350  may detect the driving location of vehicle  10  by comparing the detection result of the LiDAR and detection results obtained in advance according to the driving locations of vehicle  10  and stored in a storage device such as memory. Location detection device  350  is made up of, for example, a receiving device that receives a signal from a satellite positioning system and a computer that performs processing to obtain location information from the signal. 
     Gaze detection device  400  is described below. 
     Gaze detection device  400  detects the gaze of the user (driver) and outputs gaze information that is a detection result to display control device  100 . For instance, gaze detection device  400  may detect the gaze of the user according to the direction of user&#39;s eyes detected from an image obtained from a camera, which is disposed in front of a driver&#39;s seat and takes an image including the user&#39;s eyes. Gaze detection device  400  is made up of, for example, a camera and a computer that performs processing to detect the gaze of the user from an image obtained from the camera. 
     A configuration of display control device  100  is described below 
     Display control device  100  includes obtainer  110 , display controller  120 , and storage  130 . 
     Obtainer  110  obtains switching information indicating that switching between driving modes including the autonomous driving mode and the manual driving mode will be performed in vehicle  10 . By obtaining the switching information, obtainer  110  detects that the switching between the driving modes will be performed and detects the timing of the switching. When the switching information indicates that the first switching will be performed, obtainer  110  detects that the first switching will be performed at the timing included in the switching information. When the switching information indicates that the second switching will be performed, obtainer  110  detects that the second switching will be performed at the timing included in the switching information. 
     In addition, obtainer  110  may obtain the gaze information indicating the gaze of the user. 
     Display controller  120  causes displays  500 ,  510 , and  520  to display images corresponding to the driving mode. Specific examples of the images are described. 
       FIG.  3    illustrates an example of a vehicle driving scene.  FIG.  4    illustrates examples of information items displayed on displays  500 ,  510  and  520 . 
       FIG.  3    illustrates a scene in which vehicle  10  is about to drive into the right-turn lane and turn right. In this scene, as illustrated in  FIG.  3   , when vehicle  10  is about to turn right at the intersection, vehicle  20  is driving into the intersection from the right, and pedestrian  30  is entering the intersection from the left. 
     When for instance vehicle  10  is driving in the autonomous driving mode, display controller  120  causes display  500  to display image  600  including, for example, an arrow showing the traveling direction of vehicle  10  and the speed limit for the road at the current location. It should be noted that when vehicle  10  is driving in the manual driving mode, display controller  120  may cause display  500  to display an image that does not include the arrow showing the traveling direction. 
     For instance, display controller  120  causes display  510  to display image  610  showing the results of detecting objects. Image  610  is, for example, an image in which a frame surrounding a detected object is superimposed on an image taken by the camera. It should be noted that in the image, an identification result showing what the detected object is may be superimposed near the frame. In addition, display controller  120  may cause display  510  to display the navigation screen of the car navigation system, that is, an image showing a road map including the current location and its surroundings, a scheduled driving route, and the current location of vehicle  10 . In addition, display controller  120  may cause display  510  to display a video of video content. The video content may be obtained from broadcast waves, an optical disc, such as a DVD or a Blu-ray (registered trademark) Disc (BD), or video data stored in other storage devices or may be obtained by streaming delivery via the Internet. 
     Display controller  120  causes display  520  to display image  620  including, for example, a speedometer showing the driving speed, a tachometer showing the engine rpm, and a power meter showing an engine or motor load. 
     In addition, when obtainer  110  detects that the first switching will be performed, before the first switching is complete (that is, before the timing of the first switching), display controller  120  causes display  500  of vehicle  10  to display first information and third information. When obtainer  110  detects that the first switching will be performed, before the first switching is complete (that is, before the timing of the first switching), display controller  120  further causes display  510  to display second information. Thus, the period during which display  500  displays the first information and the third information at least overlaps with the period during which display  510  displays the second information. 
     In addition, in the period until the completion of the first switching, display controller  120  may change the display style of at least one of the first information, the second information, and the third information from a first display style to a second display style. For instance, display controller  120  may change the styles of frame lines surrounding the above information items, the colors of the information items, and the way of blinking the information items (a combination pattern of on and off times). It should be noted that display controller  120  may change the display style by switching between two or more display styles. 
     A first example of the first information, the second information, and the third information is described. In the first example, after detection that the first switching will be performed, in the period until the first switching is complete, display  500  is caused to display the first information and the third information, and display  510  is caused to display the second information. 
       FIGS.  5 A to  5 F  illustrate the first example of images displayed on displays  500 ,  510 , and  520  when the driving mode of vehicle  10  is switched from the autonomous driving mode to the manual driving mode. 
       FIG.  5 A  illustrates the first example of images displayed on displays  500 ,  510 , and  520  in the autonomous driving mode.  FIGS.  5 B to  5 E  illustrate the first example of images displayed on displays  500 ,  510 , and  520  in the period during which the driving mode is switched from the autonomous driving mode to the manual driving mode.  FIG.  5 F  illustrates the first example of images displayed on displays  500 ,  510 , and  520  in the manual driving mode. 
     As illustrated in  FIG.  5 A , when for instance vehicle  10  is driving in the autonomous driving mode, display controller  120  causes display  500  to display image  601  including an arrow showing the traveling direction of vehicle  10  and the speed limit for the road at the current location. When for instance vehicle  10  is driving in the autonomous driving mode, display controller  120  further causes display  510  to display the navigation screen of the car navigation system, that is, image  611  showing a road map including the current location and its surroundings, a scheduled driving route, and the current location of vehicle  10 . It should be noted that display controller  120  may cause display  510  to display image  601  as illustrated in  FIG.  3   . Display controller  120  further causes display  520  to display image  621  including, for example, a speedometer showing the driving speed and a tachometer showing the engine rpm. It should be noted that images  601 ,  611 ,  621  illustrated in  FIG.  5 A  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     When obtainer  110  detects that the first switching will be performed, display controller  120  displays images from the first to fourth stages on displays  500 ,  510 , and  520  in the period until the first switching is complete.  FIG.  5 B  illustrates examples of images displayed in the first stage.  FIG.  5 C  illustrates examples of images displayed in the second stage.  FIG.  5 D  illustrates examples of images displayed in the third stage.  FIG.  5 E  illustrates examples of images displayed in the fourth stage. 
     As illustrated in  FIG.  5 B , in the first stage, display controller  120  causes display  500  to display image  602  including the notice that the autonomous driving mode is going to end. The notice is an example of the first information indicating that the driving mode will be switched from the autonomous driving mode to the manual driving mode. At this time, display controller  120  causes display  510  to display image  612 , which is the same image as image  611 , and causes display  520  to display image  622  generated by changing the display style of image  621 . Here, images  602  and  622  are displayed in a first display style that shows being in the first stage before completion of the first switching. For instance, images  602  and  622  each include a frame shown by a dashed line. It should be noted that images  602  and  622  may include a frame or text in a first color instead of the frame shown by the dashed line. Image  612  may also be displayed in the first display style. That is, image  612  may include a frame shown by a dashed line. It should be noted that images  602 ,  612 ,  622  illustrated in  FIG.  5 B  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     Then, as illustrated in  FIG.  5 C , in the second stage, display controller  120  causes display  500  to display image  603  including the notice that suggests paying attention to the surroundings and an arrow showing that display  510  is displaying information (second information) useful for paying attention to the surroundings. The notice is another example of the first information indicating that the driving mode will be switched from the autonomous driving mode to the manual driving mode. The arrow shows the direction from display  500  toward display  510  and is an example of the third information indicating that display  510  is displaying the second information. The third information may indicate the position of an area displaying the second information by the arrow showing the direction from display  500  toward display  510  or may be an image showing that which portion within a frame representing the periphery of the entire display area is displaying the second information. 
     At this time, display controller  120  causes display  510  to display image  613  showing the results of detecting objects and causes display  520  to display image  623  generated by changing the display style of image  622 . Image  613  showing the results of detecting the objects is an example of the second information for assisting the user of vehicle  10  in driving in the manual driving mode. It should be noted that the second information may be an image showing at least a part of the surroundings of vehicle  10 , an image in which the results of identifying the objects are superimposed on the above image, information indicating that a pedestrian or a vehicle is approaching vehicle  10 , information indicating the driving state of vehicle  10 , or traffic jam information regarding the scheduled driving route for vehicle  10 . The information indicating the driving state may be the driving speed of vehicle  10 , the traveling direction of vehicle  10 , a steering angle, or remaining fuel or energy. Here, images  603 ,  613 ,  623  are displayed in a second display style that shows being in the second stage before the completion of the first switching. For instance, images  603 ,  613 ,  623  each include a frame shown by a thin continuous line. It should be noted that images  603 ,  613 ,  623  may include a frame or text in a second color instead of the frame shown by the thin continuous line. It should be noted that images  603 ,  613 ,  623  illustrated in  FIG.  5 C  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     Then, as illustrated in  FIG.  5 D , in the third stage, display controller  120  causes display  500  to display image  604  generated by changing the display style of image  603 . At this time, display controller  120  causes display  510  to display image  614  generated by changing the display style of image  613  and causes display  520  to display image  624  generated by changing the display style of image  623 . It should be noted that the notice included in image  604  is an example of the first information, and the arrow included in image  604  is an example of the third information. In addition, image  614  is an example of the second information. Here, images  604 ,  614 ,  624  are displayed in a third display style that shows being in the third stage before the completion of the first switching. For instance, images  604 ,  614 ,  624  each include a frame shown by an outlined dashed line. It should be noted that images  604 ,  614 ,  624  may include a frame or text in a third color instead of the frame shown by the outlined dashed line. It should be noted that images  604 ,  614 ,  624  illustrated in  FIG.  5 D  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     Then, as illustrated in  FIG.  5 E , in the fourth stage, display controller  120  causes display  500  to display image  605  including a notice indicating the end of the autonomous driving mode (that is, a notice indicating the completion of the switching to the manual driving mode) and an arrow showing that display  510  is displaying the second information. At this time, display controller  120  causes display  510  to display image  615  generated by changing the display style of image  614  and causes display  520  to display image  625  generated by changing the display style of image  624 . It should be noted that the notice included in image  605  is an example of the first information, and the arrow included in image  605  is an example of the third information. In addition, image  615  is an example of the second information. Here, images  605 ,  615 ,  625  are displayed in a fourth display style that shows being in the fourth stage indicating the completion of the first switching. For instance, images  605 ,  615 ,  625  each include a frame shown by a thick continuous line. It should be noted that images  605 ,  615 ,  625  may include a frame or text in a fourth color instead of the frame shown by the thick continuous line. It should be noted that images  605 ,  615 ,  625  illustrated in  FIG.  5 E  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     It should be noted that as long as the first display style, the second display style, the third display style, and the fourth display style are different display styles, the display styles are not limited to the exemplified display styles. As long as the first color, the second color, the third color, and the forth color are different colors, any colors may be used. For instance, the first color, the second color, the third color, and the forth color may be purple, pink, orange, and yellow, respectively. 
     Finally, as illustrated in  FIG.  5 F , soon after the completion of the switching to the manual driving mode, display controller  120  causes display  500  to display image  606  including, for example, the speed limit for the road at the current location. At this time, display controller  120  causes display  510  to display the navigation screen of the car navigation system, that is, image  616  showing the road map including the current location and its surroundings, the scheduled driving route, and the current location of vehicle  10 . Display controller  120  causes display  520  to display image  626  generated by changing the display style of image  625 . Here, image  626  is displayed in a display style that shows being in the manual driving mode. For instance, image  626  includes a frame shown by a double line. It should be noted that image  626  may include a frame or text in a color different from the first to fourth colors instead of the frame shown by the double line. It should be noted that images  606 ,  616 ,  626  illustrated in  FIG.  5 F  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     A second example of the first information, the second information, and the third information is described. In the second example, after detection that the first switching will be performed, in the period until the first switching is complete, display  520  is caused to display the first information and the third information, and displays  500  and  510  are caused to display the second information. 
       FIGS.  6 A to  6 E  illustrate the second example of images displayed on displays  500 ,  510 , and  520  when the driving mode of vehicle  10  is switched from the autonomous driving mode to the manual driving mode. 
       FIG.  6 A  illustrates the second example of images displayed on displays  500 ,  510 , and  520  in the autonomous driving mode.  FIGS.  6 B to  6 D  illustrate the second example of images displayed on displays  500 ,  510 , and  520  in the period during which the driving mode is switched from the autonomous driving mode to the manual driving mode.  FIG.  6 E  illustrates the second example of images displayed on displays  500 ,  510 , and  520  in the manual driving mode. 
     As illustrated in  FIG.  6 A , when for instance vehicle  10  is driving in the autonomous driving mode, display controller  120  causes display  500  to display image  601 A including, for example, an arrow showing the traveling direction of vehicle  10  and the speed limit for the road at the current location. When for instance vehicle  10  is driving in the autonomous driving mode, display controller  120  further causes display  510  to display the navigation screen of the car navigation system, that is, image  611 A showing a road map including the current location and its surroundings, a scheduled driving route, and the current location of vehicle  10 . Display controller  120  further causes display  520  to display image  621 A including, for example, a speedometer showing the driving speed and a tachometer showing the engine rpm. It should be noted that images  601 A,  611 A,  621 A illustrated in  FIG.  6 A  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     When obtainer  110  detects that the first switching will be performed, display controller  120  displays images from the first to third stages on displays  500 ,  510 , and  520  in the period until the first switching is complete.  FIG.  6 B  illustrates examples of images displayed in the first stage.  FIG.  6 C  illustrates examples of images displayed in the second stage.  FIG.  6 D  illustrates examples of images displayed in the third stage. 
     As illustrated in  FIG.  6 B , in the first stage, display controller  120  causes display  520  to display image  622 A including the notice that the autonomous driving mode is going to end. The notice is an example of the first information indicating that the driving mode will be switched from the autonomous driving mode to the manual driving mode. At this time, display controller  120  causes display  500  to display image  602 A showing the results of detecting objects and generated by changing the display style of image  601 A. Image  602 A showing the results of detecting the objects is an example of the second information for assisting the user of vehicle  10  in driving in the manual driving mode. Here, images  602 A is displayed in a first display style that shows being in the first stage before completion of the first switching. For instance, images  602 A includes a frame shown by a dashed line. It should be noted that image  602 A may include a frame or text in a first color instead of the frame shown by the dashed line. Image  612 A may also be displayed in the first display style. That is, image  612 A may include a frame shown by a dashed line. It should be noted that images  602 A,  612 A,  622 A illustrated in  FIG.  6 B  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     Then, as illustrated in  FIG.  6 C , in the second stage, display controller  120  causes display  520  to display image  623 A including the notice that suggests paying attention to the surroundings and two arrows showing that displays  500  and  510  are displaying information (the second information) useful for paying attention to the surroundings. The notice is another example of the first information indicating that the driving mode will be switched from the autonomous driving mode to the manual driving mode. One of the two arrows shows the direction from display  520  toward display  500 , and the other shows the direction from display  520  toward display  510 . The two arrows are examples of the third information indicating that display  500  and display  510  are displaying the second information. At this time, display controller  120  causes display  500  to display image  603 A generated by changing the display style of image  602 A and causes display  510  to display image  613 A of an area behind and to the left of vehicle  10 , taken by a camera (not illustrated). Here, images  603 A,  613 A, and  623 A are displayed in a second display style that shows being in the second stage before the completion of the first switching. For instance, images  603 A,  613 A,  623 A each include a frame shown by a thin continuous line. It should be noted that images  603 A,  613 A,  623 A may include a frame or text in a second color instead of the frame shown by the thin continuous line. It should be noted that images  603 A,  613 A,  623 A illustrated in  FIG.  6 C  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     Then, as illustrated in  FIG.  6 D , in the third stage, display controller  120  causes display  520  to display image  624 A including a notice indicating the end of the autonomous driving mode (that is, a notice indicating the completion of the switching to the manual driving mode) and two arrows showing that displays  500  and  510  are displaying the second information. At this time, display controller  120  causes display  500  to display image  604 A generated by changing the display style of image  603 A and causes display  510  to display image  614 A generated by changing the display style of image  613 A. It should be noted that the notice included in image  624 A is an example of the first information, and the two arrows included in image  624 A are examples of the third information. In addition, images  604 A and  614 A are examples of the second information. Here, images  604 A,  614 A, and  624 A are displayed in a third display style that shows being in the third stage indicating the completion of the first switching. For instance, images  604 A,  614 A,  624 A each include a frame shown by a thick continuous line. It should be noted that images  604 A,  614 A,  624 A may include a frame or text in a third color instead of the frame shown by the thick continuous line. It should be noted that images  604 A,  614 A,  624 A illustrated in  FIG.  6 D  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     It should be noted that as long as the first display style, the second display style, and the third display style are different display styles, the display styles are not limited to the exemplified display styles. As long as the first color, the second color, and the third color are different colors, any colors may be used. For instance, the first color, the second color, and the third color may be purple, pink, and orange, respectively. 
     Finally, as illustrated in  FIG.  6 E , soon after the completion of the switching to the manual driving mode, display controller  120  causes display  500  to display image  605 A including, for example, the speed limit for the road at the current location. At this time, display controller  120  causes display  510  to display the navigation screen of the car navigation system, that is, image  615 A showing the road map including the current location and its surroundings, the scheduled driving route, and the current location of vehicle  10  and causes display  520  to display image  625 A generated by changing the display style of image  624 A. Here, image  625 A is displayed in a display style that shows being in the manual driving mode. For instance, image  625 A includes a frame shown by a double line. It should be noted that image  625 A may include a frame or text in a color different from the first to third colors instead of the frame shown by the double line. It should be noted that images  605 A,  615 A,  625 A illustrated in  FIG.  6 E  are simultaneously displayed on displays  500 ,  510 , and  520 , respectively. 
     Display controller  120  may create information items, such as the first information, the second information, and the third information, to be displayed on displays  500 ,  510 , and  520  or select from images stored in storage  130 . The information items created by display controller  120  may be stored in storage  130 . 
     The first information, the second information, and the third information (that is, images) are stored in storage  130 . In addition, images for creating the first information, the second information, and the third information (that is, images) may be stored in storage  130 . 
     For instance, display control device  100  is embodied as a computer including, for example, a communication interface, non-volatile memory in which a program is stored, volatile memory, which is a temporary storage area used to execute the program, input and output ports for transmitting and receiving a signal, and a processor for executing the program. Here, the communication interface communicates with driving assistance device  200 , object detection device  300 , location detection device  350 , gaze detection device  400 , displays  500 ,  510 ,  520 , and sound device  530 . 
     As displays  500 ,  510 , and  520  are described above with reference to  FIG.  1   , detailed explanations for the displays are omitted here. 
     Sound device  530  is described below. 
     Sound device  530  outputs a sound under control of display control device  100 . Sound device  530  may output a sound by outputting a sound signal reproduced by display control device  100 . Sound device  530  is made up of, for example, an amplifier and a speaker. 
     Specific examples of information items (images) displayed on displays  500 ,  510 , and  520  are described. 
     [Operation] 
     Operation of display system  1  is described.  FIG.  7    is a sequence diagram illustrating an example of operation of display system  1 . 
     First, driving assistance device  200  transmits, to display control device  100 , switching information indicating that the driving mode will be switched from the autonomous driving mode to the manual driving mode (S 11 ). Specifically, driving assistance device  200  determines whether vehicle  10  can drive in the autonomous driving mode, according to, for example, the driving state of vehicle  10  and the situation surrounding vehicle  10 . After determining that vehicle  10  cannot drive in the autonomous driving mode, driving assistance device  200  transmits the switching information to display control device  100 . 
     Next, display control device  100  obtains, from driving assistance device  200 , the switching information indicating that the driving mode will be switched from the autonomous driving mode to manual driving mode (S 12 ). 
     Then, display control device  100  performs display control on displays  500 ,  510 , and  520  in the period until the switching from the autonomous driving mode to the manual driving mode is complete (S 13 ). Specifically, display control device  100  performs display control on displays  500 ,  510 , and  520  as illustrated in  FIGS.  5 A to  5 F . It should be noted that display control device  100  may perform display control on displays  500 ,  510 , and  520  as illustrated in  FIGS.  6 A to  6 E . 
     Then, driving assistance device  200  switches the driving mode from the autonomous driving mode to the manual driving mode at the timing of the switching (S 14 ). 
     Then, driving assistance device  200  transmits, to display control device  100 , switching information indicating that the driving mode will be switched from the manual driving mode to the autonomous driving mode (S 15 ). Specifically, driving assistance device  200  determines whether vehicle  10  can drive in the autonomous driving mode, according to, for example, the driving state of vehicle  10  and the situation surrounding vehicle  10 . After determining that vehicle  10  can drive in the autonomous driving mode, driving assistance device  200  transmits the switching information to display control device  100 . 
     Then, display control device  100  obtains, from driving assistance device  200 , the switching information indicating that the driving mode will be switched from the manual driving mode to the autonomous driving mode (S 16 ). 
     Then, display control device  100  displays images showing that the current mode is the autonomous driving mode on displays  500 ,  510 , and  520  (S 17 ). For instance, display control device  100  may display images  601 ,  611 , and  621  illustrated in  FIG.  5 A  on displays  500 ,  510 , and  520 , respectively, or display images  601 A,  611 A, and  621 A illustrated in  FIG.  6 A  on displays  500 ,  510 , and  520 , respectively. 
     After that, driving assistance device  200  switches the driving mode from the manual driving mode to autonomous driving mode at the timing of switching (S 18 ). 
     [Effects] 
     Display control device  100  according to the embodiment performs display control on displays  500 ,  510 , and  520  of vehicle  10 . Display control device  100  includes obtainer  110  and display controller  120 . Obtainer  110  obtains switching information indicating that switching between driving modes including the autonomous driving mode and the manual driving mode will be performed in vehicle  10 . When the switching information indicates that the first switching, which is switching from the autonomous driving mode to the manual driving mode, will be performed, before completion of the first switching, display controller  120  (i) causes display  500  to display the first information indicating that the first switching will be performed and the third information indicating that display  510  is displaying the second information for assisting the user of vehicle  10  in driving in the manual driving mode and (ii) causes display  510  to display the second information. 
     Thus, by displaying the two information items, the first information and the third information, on display  500 , it is possible to notify the user that the first switching will be performed and that display  510  is displaying the second information for assisting the user of vehicle  10  in driving in the manual driving mode. Display  500  is caused to display the third information, and display  510  is caused to display the second information. Thus, displaying of the third information guides the gaze of the user to display  510 , which enables the user to visually check the second information. Thus, the user can be aware that the first switching will be performed and aware of the information useful for manual driving at the time of the switching. Accordingly, the user can properly drive vehicle  10  soon after the driving mode is switched from the autonomous driving mode to the manual driving mode. 
     In addition, in display control device  100 , the third information indicates the position of an area displaying the second information. Thus, the user can readily identify the position of the area displaying the second information. Accordingly, the user can readily visually check the second information. 
     In addition, in display control device  100 , in the period until the completion of the first switching, display controller  120  changes the display style of at least one of the first information, the second information, and the third information from the first display style to the second display style. Thus, it is possible to notify, in stages, the user that the timing of the switching from the autonomous driving mode to the manual driving mode is approaching. Accordingly, the user can be aware of the time taken to switch to the manual driving mode. 
     In addition, display  500  is a head-up display, and display  510  is a display mounted on the dashboard of vehicle  10 . Thus, the user can look at display  500  while looking forward (looking at the area ahead of the vehicle). Accordingly, the user can readily check the first information and the third information while preparing for driving. In addition, by looking at display  510  mounted on the dashboard, the user can visually check the second information. 
     [Variation 1] 
       FIG.  8 A  illustrates examples of information items displayed on displays  500 ,  510 , and  520  according to Variation 1.  FIG.  8 B  illustrates relationships between a user&#39;s gaze and the information items displayed on displays  500 ,  510 , and  520  according to Variation 1. 
     Display control device  100  may further control images displayed on displays  500 ,  510 , and  520  by using gaze information output by gaze detection device  400 . Specifically, as illustrated in  FIG.  8 A , when display  500  is displaying image  602 A as second information and display  510  is displaying image  612 A as the second information, that is, the second information includes two or more notices, display control device  100  may perform display control for images  602 A and  612 A displayed on displays  500  and  510 , according to the user&#39;s gaze based on the gaze information. 
     For instance, when displays  500  and  510  are displaying images  602 A and  612 A, respectively, according to the user&#39;s gaze indicated by the gaze information, display control device  100  may identify an image displayed in the area at which the user&#39;s gaze is directed. Then, display control device  100  may cause either display  500  or display  510  displaying the identified image (in this case, display  510 ) to hide the identified image by switching the screen to screen  612 B. For instance, as illustrated in  FIG.  8 B , when the user is looking at display  510 , display control device  100  identifies image  612 A displayed on display  510 , according to the user&#39;s gaze indicated by the gaze information and controls display  510  so as not to display identified image  612 A on display  510 . 
     It should be noted that in the example illustrated in  FIG.  8 A , images  602 A and  612 A (two images) included in the second information are displayed on displays  500  and  510  (two displays). However, the two images may be displayed on one display. Even in this case, display control device  100  may identify an image displayed in the area at which the user&#39;s gaze is directed, according to the user&#39;s gaze indicated by the gaze information and cause the display to hide the identified image. The notices do not have to be images which are simultaneously displayed or hidden and just need to be displayed on one or more displays at the same time in the same period. 
     Thus, the display status of the notice presumably looked at and checked by the user is changed to hide, which can reduce inconvenience caused by notices being displayed on one or more displays. 
     [Variation 2] 
     When obtainer  110  obtains, before completion of the first switching, new switching information indicating that the second switching, which is switching to the autonomous driving mode, will be performed, display control device  100  according to the embodiment may cause, before completion of the second switching, display  500  to display fourth information indicating that the second switching will be performed. This enables a user to be aware that the driving mode will return to the autonomous driving mode. 
       FIG.  9    illustrates examples of information items displayed on displays  500 ,  510 , and  520  when fourth information is displayed. 
     The period from when obtainer  110  detects that the first switching will be performed until when the first switching is complete is described with reference to  FIGS.  5 B to  5 E . In the period, when for instance obtainer  110  obtains new switching information indicating that the second switching will be performed, display control device  100  may display, as the fourth information, image  602 B including the notice indicating that vehicle  10  will return to the autonomous driving mode as vehicle  10  can drive in the autonomous driving mode. At this time, display control device  100  may cause display  510  to display the navigation screen of the car navigation system, that is, image  612  showing a road map including the current location and its surroundings, a scheduled driving route, and the current location of vehicle  10  and cause display  520  to display image  622  including a speedometer showing the driving speed and a tachometer showing the engine rpm. After displaying images  602 B,  612 , and  622  on displays  500 ,  510 , and  520 , respectively, display control device  100  may display images  601 ,  611 , and  621  on displays  500 ,  510 , and  520 , respectively. At this time, driving assistance device  200  may return to the autonomous driving mode. 
     In addition, in the period until the completion of the first switching, display control device  100  changes the display style of at least one of the first information, the second information, and the third information from the first display style to the second display style. Consider a case in which before the completion of the first switching, obtainer  110  obtains new switching information indicating that the second switching, which is switching to the autonomous driving mode, will be performed. In this case, before the completion of the second switching, display control device  100  may (i) cause display  500  to display the fourth information indicating that the second switching will be performed and (ii) change the display style of at least one of the first information, the second information, and the third information from the second display style to the first display style. Specifically, display control device  100  may perform display control on displays  500 ,  510 , and  520  so that the driving mode returns back to the autonomous driving mode from a stage in which the new switching information was obtained in the period before the completion of the first switching, the stage being one of the first to fourth stages. For instance, if the new switching information is obtained in the fourth stage, display control device  100  may cause display  500  to display the fourth information and then perform display control on displays  500 ,  510 , and  520  so that images corresponding to the third stage, images corresponding to the second stage, images corresponding to the first stage, and the notice indicating the completion of the switching to the autonomous driving mode are displayed in the order named. 
     This enables the user to be aware of the time taken to return to the autonomous driving mode. 
     [Variation 3] 
     In the examples described in the embodiment, display control device  100  notifies the user of switching information by causing display  500  to display the first information indicating that the driving mode will be switched from the autonomous driving mode to the manual driving mode. However, the notification method is not limited to the above method. Display control device  100  may notify the user of the switching information by causing sound device  530  to output, by sound, the first information indicating that the driving mode will be switched from the autonomous driving mode to the manual driving mode. 
     Other Embodiments 
     The display control device, the display control method, and the recording medium according to one or more than one aspect are described on the basis of the embodiment. However, the present disclosure is not limited to the descriptions in the embodiment. The present disclosure may include, within the spirit of the present disclosure, one or more embodiments made by making various changes envisioned by those skilled in the art to the above embodiment. 
     For instance, in the embodiment, each of the structural elements which are the processing units of each device of display system  1  may be dedicated hardware or may be caused to function by executing a software program suitable for the structural element. Each structural element may be caused to function by a program executor, such as a central processing unit (CPU) or a processor, reading and executing the software program stored in a non-transitory recording medium, such as a hard disk or semiconductor memory. 
     It should be noted that the present disclosure includes the following cases. 
     (1) At least one of the devices described above is a computer system made up of, for example, a microprocessor, read only memory (ROM), random access memory (RAM), a hard disk unit, a display unit, a keyboard, and a mouse. Computer programs are stored in the RAM or the hard disk unit. When the microprocessor operates according to a computer program, the at least one of the devices can achieve the function. Here, to achieve a predetermined function, the computer program is made by combining instruction codes indicating instructions to the computer. 
     (2) A part or all of the structural elements of the at least one of the devices may be one system large scale integration (LSI). The system LSI is a super-multifunctional LSI manufactured by integrating multiple parts into one chip and specifically a computer system including a microprocessor, ROM, and RAM. Computer programs are stored in the RAM. When the microprocessor operates according to a computer program, the system LSI can achieve its function. 
     (3) A part or all of the structural elements of the at least one of the devices may be an IC card or a single module detachable from and attachable to the at least one device. The IC card or the module is a computer system including a microprocessor, ROM and RAM. The IC card or the module may include the above super-multifunctional LSI. When the microprocessor operates according to a computer program, the IC card or the module can achieve its function. The IC card or the module may be tamper-resistant. 
     (4) The present disclosure may be the method described above. The present disclosure may be a computer program provided for a computer to achieve the method and a digital signal made from the computer program. 
     The present disclosure may be a non-transitory computer-readable recording medium, such as a flexible disk, a hard disk, a compact disc (CD)-ROM, a DVD, a DVD-ROM, a DVD-RAM, a Blu-ray (BD) (registered trademark) disc, and semiconductor memory, in which a computer program or a digital signal is stored. The present disclosure may be the digital signal stored in such a recording medium. 
     The present disclosure may be transmission of a computer program or a digital signal via, for example, a network typified by a telecommunications line, a wireless or wired communication line, or the Internet or data broadcasting. 
     By storing a program or a digital signal in a recording medium and transferring the program or the digital signal to another independent computer system or by transferring the program or the digital signal to another independent computer system via, for example, the network, the independent computer system may perform processing. 
     While various embodiments have been described herein above, it is to be appreciated that various changes in form and detail may be made without departing from the spirit and scope of the present disclosure as presently or hereafter claimed. 
     Further Information about Technical Background to this Application 
     The disclosure of the following patent application including specification, drawings and claims are incorporated herein by reference in its entirety: Japanese Patent Application No. 2021-176685 filed on Oct. 28, 2021. 
     INDUSTRIAL APPLICABILITY 
     The present disclosure is useful as, for example, a display control device that can assist a user in properly driving a vehicle soon after the driving mode of the vehicle is switched from an autonomous driving mode to a manual driving mode.