Motion sickness prevention system, terminal, and control method

Abstract

To provide a car sickness prevention system which enables an occupant operating a terminal to easily understand that an inertial force may be applied to the occupant.SOLUTION: A car sickness prevention system 1, 101, 201, 301 for preventing car sickness of an occupant has: a terminal 17 held by an occupant; and acquisition devices 13, 15 for acquiring behavioral information on behavior of a vehicle which the occupant is in. The terminal displays the behavior of the vehicle on a screen 27, 27A based on the behavioral information acquired by the acquisition devices.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a motion sickness prevention system for preventing motion sickness in a vehicle. [Background technology]

[0002] A driving assistance device that prevents occupants from getting carsick due to rebound longitudinal acceleration is known (for example, see Patent Document 1). The driving assistance device in Patent Document 1 is equipped with notification devices such as a speaker, a head-up display, and an in-vehicle monitor. When rebound longitudinal acceleration occurs, the notification device notifies the occupants to prepare for the inertial force caused by the rebound. This allows the occupants to prepare in advance for the rebound, thereby preventing the occupants from getting carsick due to the rebound longitudinal acceleration. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-11594 Summary of the Invention [Problem to be solved by the invention]

[0004] In the driving assistance device of Patent Document 1, when a notification is made on a head-up display or an in-vehicle monitor, the occupant needs to turn his / her gaze to the head-up display or the in-vehicle monitor. However, when the occupant is concentrating on operating a terminal such as a smartphone, it is not easy for him / her to move his / her gaze to the head-up display or the in-vehicle monitor.

[0005] In view of the above background, an object of the present invention is to provide a motion sickness prevention system that enables a passenger operating a terminal to easily understand that an inertial force may be applied. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the present invention is a motion sickness prevention system (1, 101, 201, 301) for preventing motion sickness in occupants, which comprises a terminal (17) held by the occupant and an acquisition device (13, 15) for acquiring behavior information regarding the behavior of the vehicle in which the occupant is riding, and the terminal displays the behavior of the vehicle on a screen (27, 27A) based on the behavior information acquired by the acquisition device.

[0007] According to this aspect, the behavior of the vehicle based on the behavior information is displayed on the terminal, so that the occupant can easily understand that an inertial force may be applied even while operating the terminal.

[0008] In addition, in the above aspect, preferably, the acquisition device includes a navigation device (13) that sets a route to the destination, and the terminal displays on the screen (27, 27A) the turning behavior of the vehicle predicted based on the current location of the vehicle and the route as the behavior information.

[0009] According to this aspect, the turning behavior based on the set route is displayed on the terminal, which allows the occupant to estimate in advance the direction of the inertial force that may be applied to the occupant and prepare in advance for the inertial force, thereby preventing the occupant from getting motion sickness.

[0010] In the above aspect, the terminal preferably displays the behavior information by the direction of movement of an icon (30) corresponding to the vehicle.

[0011] According to this aspect, the occupant can recognize the direction of the inertial force relative to the vehicle, regardless of their posture. Therefore, the occupant can prepare for the inertial force in advance, thereby preventing the occupant from getting motion sickness.

[0012] In addition, in the above aspect, preferably, the acquisition device acquires the lateral acceleration of the vehicle, and the terminal displays the behavior information by drawing an arrow on the icon corresponding to the vehicle so that the icon turns in the direction of the lateral acceleration acquired by the acquisition device.

[0013] According to this aspect, the occupant can easily recognize the turning direction by the arc arrow displayed on the screen of the terminal.

[0014] In addition, in the above aspect, preferably, the acquisition device acquires the longitudinal acceleration of the vehicle, and the terminal displays on the screen (27) an icon corresponding to the vehicle at a reference position and at a moved position that has moved from the reference position in proportion to the longitudinal acceleration of the vehicle detected by the acquisition device.

[0015] According to this aspect, the passenger can recognize the magnitude of the longitudinal acceleration of the vehicle from the position of the icon displayed on the screen of the terminal.

[0016] In addition, in the above aspect, preferably, the acquisition device acquires the steering angle of the vehicle, and the terminal displays the behavior of the vehicle by displaying an arrow superimposed on the vehicle so that the icon corresponding to the vehicle turns at the steering angle acquired by the acquisition device.

[0017] According to this aspect, the occupant can easily recognize the turning direction by the arc arrow displayed on the screen of the terminal.

[0018] In the above aspect, preferably, when a predetermined application is being executed, the terminal displays the behavior information superimposed on the edge of the execution screen (27A) of the application.

[0019] According to this aspect, the occupant can be made more reliably aware of the behavior of the vehicle.

[0020] Also, in the above aspect, preferably, when a predetermined application is being executed, the terminal displays the behavior information by superimposing an illuminating area (40) on the edge of the screen that matches the turning behavior of the vehicle.

[0021] According to this aspect, the occupant can be made more reliably aware of the behavior of the vehicle.

[0022] In addition, in the above aspect, preferably, when a predetermined application is being executed, the terminal displays the behavior information by superimposing an illuminating area (40) on the edge of the screen, and the acquisition device moves the illuminating area based on the turning direction of the vehicle.

[0023] According to this aspect, the passenger can easily recognize the turning direction of the vehicle based on the movement direction of the light emitting area.

[0024] In addition, in the above aspect, it is preferable to include a biosensor that acquires biometric information of the occupant, and the terminal determines whether or not the occupant is showing signs of motion sickness based on the biometric information acquired by the biosensor (302), and when it determines that the occupant is not showing signs of motion sickness, stops displaying the behavior of the vehicle on the screen.

[0025] According to this aspect, the vehicle behavior is not displayed on the screen of the terminal of a passenger who does not show any signs of motion sickness, thereby preventing the display of the behavior from obscuring the display of the application execution screen of the terminal.

[0026] In the above aspect, the biosensor is preferably provided in a seat (5, 6) on which the occupant sits.

[0027] According to this aspect, the biological information of the occupant can be acquired more accurately.

[0028] In addition, in the above aspect, the vehicle preferably includes light-emitting devices (311L, 311R, 313) that emit light into the passenger compartment, and a control device (16) that controls the light-emitting devices, and the control device controls the light-emitting devices based on the behavior information.

[0029] According to this aspect, the behavior of the vehicle is more reliably notified to the occupants. [Effects of the Invention]

[0030] One aspect of the present invention is a motion sickness prevention system for preventing motion sickness in a passenger, the system comprising a terminal held by the passenger and an acquisition device for acquiring behavior information relating to the behavior of a vehicle in which the passenger is riding, the terminal displaying the behavior of the vehicle on a screen based on the behavior information acquired by the acquisition device. According to this aspect, because the behavior of the vehicle based on the behavior information is displayed on the terminal, the passenger can easily understand that an inertial force may be applied even while operating the terminal.

[0031] In the above aspect, preferably, the acquisition device includes a navigation device that sets a route to the destination, and the terminal displays on the screen as the behavior information a turning behavior of the vehicle predicted based on the current location of the vehicle and the route. According to this aspect, the terminal displays the turning behavior based on the set route. This allows the occupant to estimate in advance the direction of an inertial force that may be applied to them and prepare in advance for that inertial force, thereby preventing motion sickness in the occupant.

[0032] In the above aspect, the terminal preferably displays the behavior information by the direction of movement of an icon corresponding to the vehicle. According to this aspect, the occupant can recognize the direction of the inertial force relative to the vehicle, regardless of their posture. This allows the occupant to prepare in advance for the inertial force, thereby preventing the occupant from getting motion sickness.

[0033] In the above aspect, preferably, the acquisition device acquires the lateral acceleration of the vehicle, and the terminal displays the behavior information by drawing an arrow on the icon corresponding to the vehicle so that the icon turns in the direction of the lateral acceleration acquired by the acquisition device. According to this aspect, the occupant can easily recognize the turning direction by the arc arrow displayed on the screen of the terminal.

[0034] In the above aspect, preferably, the acquisition device acquires the longitudinal acceleration of the vehicle, and the terminal displays on the screen an icon corresponding to the vehicle at a reference position and at a moved position that is moved from the reference position in proportion to the longitudinal acceleration of the vehicle detected by the acquisition device. According to this aspect, the occupant can recognize the magnitude of the longitudinal acceleration of the vehicle from the position of the icon displayed on the screen of the terminal.

[0035] In the above aspect, preferably, the acquisition device acquires a steering angle of the vehicle, and the terminal displays the behavior of the vehicle by displaying an arrow superimposed on the vehicle so that the icon corresponding to the vehicle turns at the steering angle acquired by the acquisition device. According to this aspect, the occupant can easily recognize the turning direction by the arc-shaped arrow displayed on the screen of the terminal.

[0036] In the above aspect, preferably, when a predetermined application is being executed, the terminal displays the behavior information by superimposing it on an edge of the execution screen of the application. According to this aspect, it is possible to more reliably allow the occupant to recognize the behavior of the vehicle.

[0037] In the above aspect, preferably, when a predetermined application is being executed, the terminal displays the behavior information by superimposing a light-emitting area on an edge of the screen that matches the turning behavior of the vehicle. According to this aspect, the occupant can be more reliably made aware of the behavior of the vehicle.

[0038] In the above aspect, preferably, when a predetermined application is being executed, the terminal displays the behavior information by superimposing a light-emitting area on an edge of the screen, and the acquisition device moves the light-emitting area based on the turning direction of the vehicle. According to this aspect, the occupant can easily recognize the turning direction of the vehicle from the moving direction of the light-emitting area.

[0039] In the above aspect, the device preferably includes a biosensor that acquires biometric information of the occupant, and the device determines whether the occupant has signs of motion sickness based on the biometric information acquired by the biosensor, and when it determines that the occupant does not have signs of motion sickness, stops displaying the behavior of the vehicle on the screen. According to this aspect, the behavior of the vehicle is not displayed on the screen of the device of an occupant who does not have signs of motion sickness. This prevents the display of the behavior from making it difficult to see the application execution screen of the device.

[0040] In the above aspect, the biosensor is preferably provided in a seat in which the occupant sits. According to this aspect, biometric information of the occupant can be obtained more accurately.

[0041] In the above aspect, the vehicle preferably includes a light-emitting device that emits light into the passenger compartment and a control device that controls the light-emitting device, and the control device controls the light-emitting device based on the behavior information. According to this aspect, the behavior of the vehicle can be reliably notified to the occupants. [Brief explanation of the drawings]

[0042] [Figure 1] An explanatory diagram showing the interior of a vehicle equipped with a motion sickness prevention system when (A) the front seats are positioned so that they face forward, and (B) the front seats are rotated and positioned so that they face backward. [Figure 2] Block diagram showing the configuration of a motion sickness prevention system [Figure 3] 1 is a flowchart showing a display process of the motion sickness prevention system according to the first embodiment; [Figure 4] 1A and 1B are diagrams showing screen displays when the behavior sensor detects (A) a leftward lateral acceleration greater than a first lateral threshold and equal to or less than a second lateral threshold, and (B) a leftward lateral acceleration greater than the second lateral threshold, and (C) a modified example of the screen display of (A). [Figure 5] 1A and 1B are diagrams showing screen displays when the behavior sensor detects (A) a leftward lateral acceleration greater than a first lateral threshold and equal to or less than a second lateral threshold, and (B) a leftward lateral acceleration greater than the second lateral threshold, and (C) a modified example of the screen display of (A). [Figure 6] A diagram showing the screen display when the behavior sensor detects (A) forward longitudinal acceleration, (B) a longitudinal acceleration smaller than that in (A), and (C) a rearward longitudinal acceleration. [Figure 7] 10 is a flowchart showing a display process of the motion sickness prevention system according to the second embodiment. [Figure 8] FIG. 10 is an explanatory diagram illustrating a screen display of a terminal when steering is performed to the left and the steering angle is equal to or greater than a steering angle threshold value; [Figure 9] 10 is a flowchart showing a display process of the motion sickness prevention system according to the third embodiment. [Figure 10] (A) Example of the device screen display when turning left and (B) turning right [Figure 11] 10 is a flowchart showing a display process of the motion sickness prevention system according to the fourth embodiment. [Figure 12] (A) Modified examples of the screen display of the terminal when turning left and (B) turning right in the third embodiment [Figure 13] Modified examples of the screen display of the terminal during (A) left turning and (B) acceleration in the third embodiment [Figure 14] A modified example of the screen display of FIG. 12(A) [Figure 15] (A) A schematic diagram showing the lighting conditions when turning left in a vehicle equipped with right and left lights and left and right light-emitting devices, and (B) an enlarged view of the area enclosed by the dashed line in (A). DETAILED DESCRIPTION OF THE INVENTION

[0043] Hereinafter, the motion sickness prevention system of the present invention will be described with reference to the drawings.

[0044] <<First Embodiment>> As shown in Fig. 1, the motion sickness prevention system 1 is provided in a vehicle 2. In this embodiment, the vehicle 2 is a four-wheeled passenger car.

[0045] The vehicle 2 is provided with a passenger compartment 3. The passenger compartment 3 is provided with a pair of left and right front seats (hereinafter referred to as front seats 5) and a rear seat provided behind the front seats 5. In this embodiment, the passenger compartment 3 is provided with a pair of left and right rear seats 6 located behind the front seats 5 as rear seats. One of the pair of left and right front seats 5 constitutes a driver's seat, and the other constitutes a so-called passenger seat.

[0046] The bottom of the vehicle interior 3 is defined by a floor 8. The front seat 5 and the rear seat 6 each have a seat cushion 10 placed on the floor 8, a seat back 11 connected to the rear of the seat cushion 10, and a headrest 12 provided on the upper side of the seat back 11.

[0047] In this embodiment, the vehicle 2 is provided with a navigation device 13 that acquires the current location of the vehicle 2 and receives input of a destination from the occupant to set a route from the current location to the destination.

[0048] In this embodiment, the vehicle 2 can be switched between manual driving, in which the driver has the operating authority, and automatic driving, in which the vehicle 2 has the operating authority. During automatic driving, the vehicle 2 travels autonomously along a route set by the navigation device 13. However, the vehicle 2 is not limited to being capable of switching between manual driving and automatic driving.

[0049] As shown in Figures 1(A) and 1(B), the front seat 5 and the rear seat 6 are each supported on the floor 8 so as to be rotatable about an axis X extending in the vertical direction. This allows an occupant to position the front seat 5 and the rear seat 6 so that they face each other, for example, by rotating the front seat 5 (see Figure 1(B)).

[0050] Next, we will explain the motion sickness prevention system 1. The motion sickness prevention system 1 is a system that aims to make it difficult for occupants to get motion sickness (motion sickness) and, if they do get motion sickness, to reduce the severity of the illness, and in this specification, "preventing motion sickness" refers to both making it difficult for occupants to get motion sickness and reducing the severity of motion sickness.

[0051] As shown in FIG. 2, the motion sickness prevention system 1 includes a behavior sensor 15 provided in the vehicle 2, a control device 16 that acquires the output of the behavior sensor 15, and a terminal 17 (terminal device; also called a portable terminal if portable) held by each occupant.

[0052] The behavior sensor 15 is a device (acquisition device) that acquires behavior information related to the behavior of the vehicle 2 in which the occupant is riding. The behavior information acquired by the behavior sensor 15 includes, for example, longitudinal acceleration, lateral acceleration, vertical acceleration, roll rate, pitch rate, yaw rate, and vehicle speed.

[0053] In this embodiment, the behavior sensor 15 is configured with a six-axis inertial sensor 15A, and acquires the longitudinal, lateral, and vertical accelerations of the vehicle 2, as well as the angular velocities of the roll rate, pitch rate, and yaw rate, as behavior information. However, the behavior sensor 15 is not limited to this embodiment and may be, for example, a three-axis inertial measurement sensor 15B, a single-axis or multi-axis acceleration sensor 15C, a vehicle speed sensor 15D, etc. The behavior sensor 15 may also include, for example, a steering angle sensor 15E that detects a steering angle, an accelerator sensor 15F that detects the amount of depression of an accelerator pedal, and a brake sensor 15G that detects the amount of depression of a brake pedal.

[0054] The control device 16 is configured by a computer equipped with a central processing unit (CPU), RAM, ROM, and a storage device. In this embodiment, the control device 16 is connected to various in-vehicle devices including the behavior sensor 15 and the navigation device 13, and controls the vehicle 2 based on inputs from the behavior sensor 15 and the route set by the navigation device 13, and causes the vehicle 2 to travel autonomously along the route set by the navigation device 13.

[0055] The control device 16 is configured to be able to communicate with a terminal 17 in the vehicle cabin 3 via wireless LAN, infrared communication, Bluetooth (registered trademark), etc. The control device 16 acquires behavior information of the vehicle 2 detected by the behavior sensor 15 and transmits it to the terminal 17 as appropriate. In this embodiment, the control device 16 acquires the lateral acceleration and longitudinal acceleration of the vehicle 2 from the six-axis inertial sensor 15A and transmits the acquired lateral acceleration and longitudinal acceleration to the terminal 17.

[0056] The terminal 17 is configured as a so-called smartphone equipped with a central processing unit (CPU, hereinafter referred to as processing unit 21), RAM 22, ROM 23, storage device 24, GPS receiver 25, and touch panel 26. The touch panel 26 has a screen 27 that presents information to the occupant, and functions as a display unit that presents information to the occupant. The touch panel 26 also functions as a reception unit that receives input from the occupant. The terminals 17 are each held by an occupant in the vehicle interior 3.

[0057] The processing device 21 executes a display process for displaying a screen on the touch panel 26 based on the behavior information transmitted from the control device 16. Details of the display process will be described below with reference to Fig. 3 showing a flowchart of the display process.

[0058] In the first step ST1 of the display process, the processing device 21 determines whether the magnitude of the lateral acceleration acquired by the behavior sensor 15 is equal to or less than a predetermined threshold (hereinafter referred to as a first lateral threshold). If the magnitude of the lateral acceleration is equal to or less than the first lateral threshold, the processing device 21 executes step ST2, and if the magnitude of the lateral acceleration is greater than the first lateral threshold, the processing device 21 executes step ST3.

[0059] In step ST2, the processing device 21 determines whether the magnitude of the longitudinal acceleration is equal to or less than a predetermined threshold (first longitudinal threshold). If the magnitude of the longitudinal acceleration is equal to or less than the first longitudinal threshold, the processing device 21 ends the display process. If the magnitude of the longitudinal acceleration is greater than the predetermined threshold, the processing device 21 executes step ST4.

[0060] In step ST3, the processing device 21 determines whether the direction of the lateral acceleration is leftward. If the direction of the lateral acceleration is leftward, the processing device 21 executes step ST5, and if the direction is not leftward (i.e., rightward), the processing device 21 executes step ST6.

[0061] In step ST4, the processing device 21 determines whether the direction of the longitudinal acceleration is forward. If the longitudinal acceleration is forward, the processing device 21 executes step ST7, and otherwise (i.e., if the direction of the longitudinal acceleration is backward), the processing device 21 executes step ST8.

[0062] In step ST5, the processing device 21 displays, on the screen 27 of the touch panel 26, a vehicle icon 30 that depicts a vehicle 2 and an arc-shaped arrow (with an arrowhead at the end of the arc) extending from the vehicle icon 30 to the left front, as shown in FIG. 4(A). At this time, the processing device 21 displays the vehicle icon 30 at a reference position in the lower center of the screen 27. As shown in FIG. 4(A), the arc extends from the vehicle icon 30 to the left front. The arc indicates the trajectory of the vehicle icon 30 when it turns left, and the arc-shaped arrow makes it appear as if the vehicle icon 30 is about to turn left. The arc-shaped arrow indicates the movement direction of the vehicle icon 30 and corresponds to the predicted turning direction of the vehicle 2. In this embodiment, the processing device 21 reduces the radius of the arc (the radius of the circle that constitutes the arc) when the lateral acceleration is greater than the second lateral threshold (see FIG. 4(B)) compared to when the lateral acceleration is equal to or less than a predetermined threshold (second lateral threshold) that is greater than the first lateral threshold (see FIG. 4(A)). Also, as shown in FIG. 4(C), the processing device 21 may display the vehicle icon 30 on the screen 27 tilted to the left with respect to the vertical direction. In this case, the processing device 21 may set the tilt angle θ (see FIG. 4(C)) of the vehicle icon 30 according to (more specifically, proportional to) the magnitude of the lateral acceleration. When the display is complete, the processing device 21 ends the display process.

[0063] In step ST6, the processing device 21 displays a vehicle icon 30 representing a vehicle 2 and an arc-shaped arrow extending from the vehicle icon 30 to the right and forward on the screen 27 of the touch panel 26. In this embodiment, the processing device 21 reduces the radius of the arc (the radius of the circle that constitutes the arc) when the lateral acceleration is greater than the second lateral threshold (see FIG. 5(B)) compared to when the lateral acceleration is equal to or less than the second lateral threshold (see FIG. 5(A)). Furthermore, as shown in FIG. 5(C), the processing device 21 may display the vehicle icon 30 on the screen 27 tilted to the right with respect to the up-down direction. In this case, the processing device 21 may set the tilt angle δ (see FIG. 5(C)) of the vehicle icon 30 according to (more specifically, proportional to) the magnitude of the lateral acceleration. When the display is complete, the processing device 21 ends the display process.

[0064] In step ST7, the processing device 21 displays a vehicle icon 30, which is a design of a vehicle 2, on the screen 27 at a reference position (see the solid lines in FIGS. 6A and 6B) and at a movement position in front of the vehicle icon 30 at the reference position (see the dashed lines in FIGS. 6A and 6B). In this embodiment, the processing device 21 determines the distance between the reference position and the movement position based on the magnitude of the longitudinal acceleration acquired by the behavior sensor 15 (see FIGS. 6A and 6B). More specifically, the processing device 21 sets a larger distance between the reference position and the movement position as the longitudinal acceleration acquired by the behavior sensor 15 increases. As a result, when the longitudinal acceleration is large (see FIG. 6A), the two vehicle icons 30 are displayed farther apart on the screen 27 of the terminal 17 than when the longitudinal acceleration is small (see FIG. 6B). The processing device 21 also displays a forward-facing arrow on the screen 27 from the vehicle icon 30 at the reference position to the vehicle icon 30 at the movement position, indicating that the vehicle icon 30 is moving from the reference position to the movement position. When the display is complete, the processing unit 21 ends the display process.

[0065] In step ST8, the processing device 21 displays a vehicle icon 30, which is a design of a vehicle 2, at a reference position on the screen 27 and at a destination position behind the vehicle icon 30 at the reference position (see FIG. 6(C)). In this embodiment, the processing device 21 determines the distance between the reference position and the destination position based on the magnitude of the longitudinal acceleration acquired by the behavior sensor 15. More specifically, the processing device 21 sets a larger distance between the reference position and the destination position as the longitudinal acceleration acquired by the behavior sensor 15 increases. As a result, when the longitudinal acceleration is large, the two vehicle icons 30 are displayed farther apart on the screen 27 of the terminal 17 compared to when the longitudinal acceleration is small. Furthermore, the processing device 21 further displays a backward arrow on the screen 27 from the vehicle icon 30 at the reference position to the vehicle icon 30 at the destination position, indicating that the arrow points from the reference position to the destination position. When the display is completed, the processing device 21 ends the display process.

[0066] Next, we will explain the effects of the thus configured motion sickness prevention system 1. In the motion sickness prevention system 1, when acceleration equal to or greater than the first lateral threshold is applied to the vehicle 2 in the left-right direction (No in ST1), or when acceleration equal to or greater than the first longitudinal threshold is applied to the vehicle 2 in the front-rear direction (No in ST2), the terminal 17 displays the behavior of the vehicle 2.

[0067] More specifically, when the vehicle 2 turns left and the behavior sensor 15 detects acceleration in the left direction greater than the first lateral threshold, the vehicle icon 30 and an arc-shaped arrow extending from the vehicle icon 30 to the left front are displayed on the screen 27 of the terminal 17, as shown in Figures 4(A) and (B). When the vehicle 2 turns right and the behavior sensor 15 detects acceleration in the right direction greater than the first lateral threshold, the vehicle icon 30 and an arc-shaped arrow extending from the vehicle icon 30 to the right front are displayed on the screen 27 of the terminal 17, as shown in Figures 5(A) and (B).

[0068] Furthermore, when the vehicle 2 accelerates forward and the behavior sensor 15 detects a forward acceleration greater than the first vertical threshold, the screen 27 of the terminal 17 displays a vehicle icon 30 at the reference position and the moving position, as shown in Figures 6(A) to (C), and further displays an arrow indicating the direction from the reference position to the moving position.

[0069] In this way, the terminal 17 displays on its screen 27 a forward / backward arrow or an arc arrow indicating the direction of movement of the vehicle icon 30 based on the behavior information acquired by the behavior sensor 15. This allows the occupant operating the terminal 17 to easily understand the behavior of the vehicle 2. Therefore, the occupant can understand that an inertial force may be applied and its direction, and can prepare for that inertial force in advance. This makes the occupant less susceptible to motion sickness, thereby preventing motion sickness.

[0070] In particular, when the vehicle 2 travels autonomously, the orientation and arrangement of the seats 5 and 6 in the passenger compartment 3 can be freely arranged. Therefore, as can be seen from Figures 1(A) and 1(B), the orientation of the occupants can be changed by arranging the seats 5 and 6. If only an arrow indicating the turning direction of the vehicle 2 is displayed on the screen 27 of the terminal 17, the occupant may understand that they will move in the direction indicated by the arrow based on the display on the screen 27, and may infer that an inertial force is being applied in a direction different from the actual direction.

[0071] 4 and 5, a vehicle icon 30 and an arrow indicating the turning direction of the vehicle icon 30 are displayed on the screen 27 of the terminal 17. This allows the occupant to easily recognize that the direction indicated by the arrow indicates the turning direction of the vehicle 2, regardless of the seating position or posture. This allows the occupant to more accurately estimate the direction of the inertial force acting on their body, thereby preventing motion sickness.

[0072] Furthermore, if the vehicle 2 accelerates forward at an acceleration greater than the first longitudinal threshold (No in ST2, No in ST7), the vehicle icon 30 is displayed at the reference position and the destination position on the screen 27 (ST8). As the magnitude of the acceleration increases, the processing device 21 sets a larger distance between the reference position and the destination position. Therefore, the occupant can infer the magnitude of the acceleration from the distance between the two vehicle icons 30. This allows the occupant to estimate the magnitude of the inertial force acting on their body and prepare in advance for that inertial force.

[0073] When the vehicle 2 is turning left or right and the lateral acceleration is greater than the second lateral threshold, the processing device 21 sets a larger radius for the arc displayed superimposed on the vehicle 2 than when the lateral acceleration is greater than the first lateral threshold but not greater than the second lateral threshold. Therefore, the occupant can easily estimate the magnitude of the lateral acceleration acting on the vehicle 2 from the shape of the arc. This allows the occupant to estimate the magnitude of the inertial force acting on their body and prepare in advance for that inertial force.

[0074] <<Second embodiment>> The motion sickness prevention system 101 according to the second embodiment differs in that the control device 16 transmits the steering angle acquired by the steering angle sensor 15E, the accelerator pedal depression amount acquired by the accelerator sensor 15F, and the brake pedal depression amount acquired by the brake sensor 15G to the terminal 17. Another difference is that, as shown in Fig. 7, the processing device 21 executes steps ST11 to ST14 instead of steps ST1 to ST4 of the display processing. The other configurations are the same as those of the first embodiment, and therefore description of the other configurations will be omitted.

[0075] In step ST11, the processing device 21 determines whether the magnitude of the steering angle acquired by the steering angle sensor 15E is equal to or greater than a predetermined threshold (hereinafter referred to as the steering angle threshold). If the magnitude of the steering angle is less than the steering angle threshold, the processing device 21 executes step ST12, and if the magnitude of the steering angle is equal to or greater than the steering angle threshold, the processing device 21 executes step ST13.

[0076] In step ST12, the processing device 21 determines whether the accelerator pedal or the brake pedal is being depressed. More specifically, when either the amount of depression of the accelerator pedal or the amount of depression of the brake pedal is equal to or greater than a predetermined threshold, the processing device 21 determines that the accelerator pedal or the brake pedal is being depressed. If the accelerator pedal or the brake pedal is being depressed, the processing device 21 proceeds to step ST14, and if the accelerator pedal or the brake pedal is not being depressed, the display processing ends.

[0077] In step ST13, the processing device 21 determines whether the vehicle 2 is turning left based on the steering angle acquired by the steering angle sensor 15E, and if the vehicle 2 is turning left, it executes step ST5, and if the vehicle 2 is not turning left (turning right), it executes step ST6.

[0078] In step ST14, the processing device 21 determines whether the accelerator pedal is being depressed. More specifically, in step ST14, the processing device 21 determines that the accelerator pedal is being depressed when the amount of depression of the accelerator pedal is equal to or greater than a predetermined threshold. If the processing device 21 determines that the accelerator pedal is being depressed, it executes step ST7, and if the processing device 21 determines that the accelerator pedal is not being depressed (i.e., if the brake pedal is being depressed), it executes step ST8.

[0079] In this embodiment, as shown in Fig. 8, the processing device 21 acquires the turning radius based on the steering angle acquired by the steering angle sensor 15E in steps ST5 and ST6. In this embodiment, a table showing the relationship between the steering angle and the turning radius is stored in the storage device 24, and the processing device 21 acquires the turning radius from the acquired steering angle based on the table. Thereafter, the processing device 21 draws an arc-shaped arrow based on the acquired turning radius, and simultaneously displays the turning radius and the arc-shaped arrow.

[0080] Next, the operation and effects of the motion sickness prevention system 101 configured as described above will be described. For example, when the driver steers left and the steering angle becomes equal to or greater than the steering angle threshold (Yes in ST11, Yes in ST13), the vehicle icon 30 and an arc-shaped arrow extending from the vehicle icon 30 to the left front are displayed on the screen 27 of the touch panel 26 as shown in FIG. 8. When the driver steers right and the steering angle becomes equal to or greater than the steering angle threshold (Yes in ST11, No in ST13), the vehicle icon 30 and an arc-shaped arrow extending from the vehicle icon 30 to the right front are displayed on the screen 27 of the touch panel 26. This allows the occupant to easily recognize the turning direction of the vehicle 2, as in the first embodiment. Therefore, the occupant can estimate the direction of the inertial force, thereby preventing motion sickness.

[0081] In this embodiment, when the accelerator pedal is depressed without steering left or right (Yes in ST12, Yes in ST14), an arrow pointing forward is displayed, and when the brake pedal is depressed (Yes in ST12, No in ST14), an arrow pointing backward is displayed. This allows the occupant to estimate the direction of the inertial force, thereby preventing motion sickness.

[0082] <<Third Embodiment>> The motion sickness prevention system 201 according to the third embodiment differs from the first embodiment in that the navigation device 13 outputs a route to the terminal 17 and in the display processing executed by the processing device 21 of the terminal 17. The other configurations are the same as those of the first embodiment, and therefore a description of the other configurations will be omitted.

[0083] In this embodiment, the processing device 21 performs display processing while an application for allowing a passenger to enjoy a game is being executed. The screen 27 of the touch panel 26 that is displayed while the application is being executed is referred to as an application execution screen 27A, and the display processing executed by the processing device 21 will be described with reference to FIG.

[0084] In the first step ST21 of the display process, the processing device 21 acquires the current location of the vehicle 2 based on the GPS signal received by the GPS receiver 25. After acquiring the current location, the processing device 21 executes step ST22.

[0085] In step ST22, the processing device 21 determines whether the vehicle 2 is scheduled to make a left turn after a predetermined time based on the current location acquired in step ST21 and the route set by the navigation device 13. More specifically, the processing device 21 determines that the vehicle 2 is scheduled to make a left turn if the portion of the route closest to the current location of the vehicle 2 (for example, a portion of the route within a predetermined distance range) includes a portion that passes through a road that meanders and curves to the left, or a portion that turns left at an intersection. However, the distance range used for the determination should not include both a road that curves to the left and a road that curves to the right, and should be set to a distance range that is sufficiently smaller than the distance between adjacent intersections. If the processing device 21 determines that the vehicle 2 is scheduled to make a left turn, it executes step ST23; otherwise, it executes step ST24.

[0086] In step ST23, the processing device 21 displays a light-emitting area 40 superimposed on the upper left edge of the application execution screen 27A, as shown in Fig. 10(A). The light-emitting area 40 may be any display that can be recognized by a passenger concentrating on the game, and may be defined as a rectangular area painted in white, for example. When the display is complete, the processing device 21 ends the display process.

[0087] In step ST24, the processing device 21 estimates the turning direction of the vehicle 2 based on its own position acquired in step ST21 and the route set by the navigation device 13, and determines whether the vehicle 2 is scheduled to turn right. More specifically, the processing device 21 determines that the vehicle 2 is scheduled to turn right if the portion of the route immediately from the current position of the vehicle 2 includes a portion that passes through a road that meanders and curves to the right, or a portion that makes a right turn at an intersection. If it is determined that the vehicle 2 is scheduled to turn right, the processing device 21 terminates step ST25; otherwise, the display processing ends.

[0088] 10(B), the processing device 21 displays the light emitting area 40 superimposed on the upper right edge of the application execution screen 27A of the touch panel 26. When the display is complete, the processing device 21 ends the display process.

[0089] Next, the effects of the thus configured motion sickness prevention system 201 will be described. When it is estimated that the vehicle 2 will turn left based on the route set by the navigation device 13, the light emitting area 40 is displayed in the upper left edge of the application execution screen 27A (FIG. 10(A)). On the other hand, when it is estimated that the vehicle 2 will turn right, the light emitting area 40 is displayed in the upper right edge of the application execution screen 27A (see FIG. 10(B)).

[0090] In this way, the light emitting area 40 is displayed superimposed on the application execution screen 27A. At this time, the light emitting area 40 is displayed on the edge of the application execution screen 27A in the turning direction of the vehicle 2 (i.e., the left edge when turning left, and the right edge when turning right). This allows the occupant to obtain the turning direction of the vehicle 2, and therefore the occupant can estimate in advance the direction of the inertial force that may be applied to the occupant. Therefore, the occupant can prepare in advance for the inertial force, and therefore motion sickness of the occupant can be prevented.

[0091] The processing device 21 can estimate the predicted turning behavior of the vehicle 2, such as a left turn or a right turn, by using the current location identified by the GPS receiver 25 and the immediate route portion of the vehicle 2 based on the route set by the navigation device 13. In this way, by using the navigation device 13 as an acquisition device for predicting and acquiring behavior information related to the behavior of the vehicle 2, the turning behavior of the vehicle 2 can be easily acquired in advance, and the occupants can be notified in advance of the turning direction of the vehicle 2.

[0092] <<Fourth Embodiment>> The motion sickness prevention system 301 according to the fourth embodiment differs from the second embodiment in that a biosensor 302 (see FIGS. 1A and 1B) is provided on each of the front seat 5 and the rear seat 6, and in the display processing, but the other configurations are the same as those of the second embodiment. Therefore, a description of the other configurations will be omitted.

[0093] The biosensor 302 is provided on the surface of the seat back 11 or seat cushion 10 of the front seat 5 and the rear seat 6, and acquires biosignals such as heart rate data and sweat level of the seated occupant. In this embodiment, the biosensor 302 acquires heart rate data. The biosensor 302 outputs the acquired bioelectric signal to the control device 16, and the control device 16 appropriately transmits the acquired bioelectric signal to the terminal 17 together with information indicating the position of the acquired biosensor 302.

[0094] As shown in FIG. 11, the display process according to the fourth embodiment differs from the display process according to the second embodiment in that step ST31 is executed before step ST21, but other configurations are the same, so explanations of steps other than step ST31 will be omitted.

[0095] In step ST31, the processing device 21 acquires its own position within the vehicle cabin 3 by communicating with the control device 16 within the vehicle cabin 3. Thereafter, the processing device 21 extracts the heart rate data of the corresponding occupant from the bioelectric signal received from the control device 16 based on its own acquired position. Thereafter, the processing device 21 determines whether or not there are signs of motion sickness based on fluctuations in the heart rate data, the power spectrum of heart rate variability, and the like. In this embodiment, the processing device 21 determines that there are signs of motion sickness when an increase in high-frequency components in the power spectrum of heart rate variability, which indicates cardiac parasympathetic nerve activity, is observed. If it is determined that there are signs of motion sickness, the processing device 21 proceeds to step ST21; otherwise, it terminates the display process.

[0096] Next, the effects of the motion sickness prevention system 301 configured as described above will be described. In step ST31, the processing device 21 determines, using the biosensor 302, whether the occupant is showing signs of motion sickness. If the occupant is showing signs of motion sickness and acceleration is applied to the left, right, or forward, the light-emitting area 40 is displayed on the application execution screen 27A of the touch panel 26. On the other hand, if the occupant is not showing signs of motion sickness, the light-emitting area 40 is not displayed on the application execution screen 27A of the terminal 17 even if acceleration is applied to the left, right, or forward. In other words, when the processing device 21 determines that the occupant is not showing signs of motion sickness (No in ST31), the display of the behavior of the vehicle 2 on the screen 27 is stopped. As a result, the display of the application execution screen 27A on the terminal 17 of an occupant who is not showing signs of motion sickness is not obstructed by the light-emitting area 40, vehicle icon 30, arc arrow, etc., allowing the occupant to enjoy playing videos or playing games more.

[0097] Although the description of the specific embodiment has been completed above, the present invention is not limited to the above embodiment and can be widely modified and implemented. In the above embodiment, the terminal 17 is a portable smartphone held by each occupant, but the present invention is not limited to this embodiment. For example, the terminal 17 may be a tablet terminal 401 supported on the back of the seat back 11, or may be a non-portable terminal 17 (such as a personal computer fixed to the seat back 11 of the front seat 5). Furthermore, the terminal 17 may be detachably held on a door trim provided on a door, or the terminal 17 may be fixed to the door trim.

[0098] In the above embodiment, the vehicle 2 is a four-wheeled passenger car, but is not limited to this. The vehicle 2 may also be a bus, truck, railroad car, etc. Furthermore, the motion sickness prevention systems 1, 101, 201, 301 may be applied to any vehicle, including ships, airplanes, etc.

[0099] In the third embodiment, the light-emitting area 40 is displayed superimposed on the application execution screen 27A, but this is not limiting. For example, as shown in FIGS. 12(A) and 12(B), a vehicle icon 30 may be displayed together with the light-emitting area 40 on the application execution screen 27A of the terminal 17. This allows the occupant to recognize the direction of the inertial force relative to the vehicle 2, regardless of their posture.

[0100] Furthermore, in the second embodiment, when an application is being executed, the processing device 21 may display the light-emitting region 40 superimposed on the application execution screen 27A and may move or deform the light-emitting region 40 to match the behavior of the vehicle 2. In ST6 and ST7, the processing device 21 sets the movement direction of the light-emitting region 40 according to the turning direction, and moves the light-emitting region 40. More specifically, for example, when the vehicle 2 turns left (ST5), the processing device 21 may move the light-emitting region 40 leftward as shown in FIG. 13(A), and when the vehicle 2 turns right (ST6), the processing device 21 may move the light-emitting region 40 rightward. Furthermore, when the vehicle 2 accelerates without turning (ST7), the processing device 21 may move the light-emitting region 40 forward as shown in FIG. 13(B), and when the vehicle 2 decelerates without turning (ST8), the processing device 21 may move the light-emitting region 40 backward.

[0101] Also, at this time, as shown in FIG. 13(C), when the vehicle 2 turns left (ST5) or right (ST6), the processing device 21 may acquire a turning radius based on the driving route along which the vehicle 2 will travel, which has been set by the navigation device 13 (specifically, the curvature of the road on the driving route, etc.), and may display the acquired turning radius superimposed on the application execution screen 27A.

[0102] The size and movement speed of the light-emitting region 40 may also be set based on behavior information of the vehicle 2. For example, the control device 16 acquires the vehicle speed from the vehicle speed sensor 15D, the turning direction of the vehicle 2 from the steering angle sensor 15E, and the longitudinal acceleration of the vehicle 2 from the six-axis inertial sensor 15A, and transmits these to the processing device 21. When the processing device 21 displays the light-emitting region 40 on the application execution screen 27A in steps ST5 to ST8, the processing device 21 may set the movement speed of the light-emitting region 40 according to the vehicle speed. More specifically, the processing device 21 may increase the movement speed of the light-emitting region 40 as the vehicle speed increases. The processing device 21 may also set one of the brightness and size of the light-emitting region 40 according to the longitudinal acceleration. More specifically, the processing device 21 may increase the brightness of the light-emitting region 40 or increase the size of the light-emitting region 40 as the magnitude of the acceleration / deceleration increases.

[0103] This allows the occupant to understand the turning direction, speed, and acceleration / deceleration of the vehicle 2 from the movement, deformation, and other behavior of the light-emitting area 40 displayed overlaid on the application execution screen 27A. This allows the occupant to predict the direction and magnitude of the inertial force and prepare in advance, thereby preventing motion sickness. Furthermore, the movement of the light-emitting area 40 can shift the occupant's line of sight and control the occupant's posture, thereby preventing motion sickness.

[0104] In the fourth embodiment, the biosensor 302 is provided on each of the front seat 5 and the rear seat 6, but this is not limiting. The biosensor 302 may be, for example, a camera provided on the terminal 17, and the processing device 21 may determine whether or not there are signs of motion sickness based on the direction of gaze acquired by the camera. However, by providing the biosensor 302 on the seats 5 and 6 on which the occupants sit, as in the third embodiment, the biosensor 302 can be located closer to the occupants. This allows the biosensor 302 to acquire biometric information of the occupants more accurately.

[0105] In the fourth embodiment, the processing device 21 is configured to display the behavior of the vehicle on the screen 27 when it determines that there are signs of motion sickness (Yes in ST31), and not to display the behavior of the vehicle 2 (vehicle) when it determines that there are no signs of motion sickness (No in ST31), but this is not limiting. The processing device 21 may also be configured to receive an input from the occupant on the touch panel 26 (reception unit) regarding whether to display or hide the behavior, and switch the display of the behavior based on the input.

[0106] Specifically, in step ST31, the processing device 21 displays a button on the screen 27 indicating whether or not the occupant desires to display the behavior of the vehicle 2, and accepts input from the occupant. When an input corresponding to a desire to display the behavior is detected on the touch panel 26, the processing device 21 executes step ST21. On the other hand, when an input corresponding to not desiring to display is detected on the touch panel 26, the processing device 21 ends the display process. As a result, the behavior of the vehicle 2 is displayed on the screen 27 whenever an input corresponding to a desire to display is made on the touch panel 26, and the behavior is not displayed on the screen 27 whenever an input corresponding to not desiring to display is made (i.e., the display of the behavior on the screen 27 is stopped). This allows the occupant to arbitrarily select whether or not to display the behavior.

[0107] In the above embodiment, the turning direction and acceleration / deceleration of the vehicle 2 are displayed on the screen 27 by the vehicle icon 30, arrow, and light-emitting area 40, but the present invention is not limited to these modes and may be displayed by characters (for example, large / medium / small acceleration, small curve / medium curve / large curve, etc.). However, in the above embodiment, arrows and light-emitting areas 40, rather than characters, are displayed on the screen 27, allowing the occupant to intuitively understand the turning direction of the vehicle 2.

[0108] 15(A), the vehicle 2 may be provided with a left light 311L that illuminates the left side of the interior of the vehicle compartment 3 and a right light 311R that illuminates the right side of the interior of the vehicle compartment 3, and the control device 16 may be configured to control the illumination of both lights 311L and 311R based on behavior information of the vehicle 2. For example, the control device 16 may turn on the left light 311L when the vehicle 2 turns left (specifically, when the behavior sensor 15 detects acceleration in the left direction or when the travel route acquired by the navigation device 13 is set to turn left), and may turn on the right light 311R when the vehicle 2 turns right (specifically, when the behavior sensor 15 detects acceleration in the right direction or when the travel route acquired by the navigation device 13 is set to turn right).

[0109] The control device 16 may be connected to left and right light-emitting devices 313 that extend in the left-right direction and are capable of emitting light in predetermined areas, and may illuminate predetermined areas (hereinafter, light-emitting areas 315) of the left and right light-emitting devices 313 based on behavior information of the vehicle 2, and may change the light-emitting areas 315 to match the behavior information. More specifically, when the vehicle 2 turns left (when the behavior sensor 15 detects acceleration in the left direction, or when the travel route acquired by the navigation device 13 is set to turn left), the control device 16 may move the light-emitting areas 315 of the left and right light-emitting devices 313 in a flowing manner from left to right, as shown in Fig. 15(B) , and when the vehicle 2 turns right (when the behavior sensor 15 detects acceleration in the right direction, or when the travel route acquired by the navigation device 13 is set to turn right), the control device 16 may move the light-emitting areas 315 of the left and right light-emitting devices 313 in a flowing manner from right to left.

[0110] Furthermore, the control device 16 is connected to front and rear light emitting devices 317 that extend in the front and rear directions and are capable of emitting light in a predetermined area, and may illuminate a predetermined area (hereinafter referred to as the light emitting area) of the front and rear light emitting devices 317 based on behavior information of the vehicle 2, and may change the light emitting area to match the behavior information. More specifically, when the behavior sensor 15 detects acceleration in the forward direction (i.e., when the vehicle 2 accelerates), the control device 16 may move the light emitting area so that it flows from front to rear, and when the behavior sensor 15 detects acceleration in the backward direction (i.e., when the vehicle 2 decelerates), the control device 16 may move the light emitting area so that it flows from rear to front.

[0111] As a result, the display on the screen 27 of the terminal 17 is linked to the light emitted by the lights 311L, 311R and the light-emitting devices 313, 317 of the vehicle 2, so that the occupants are reliably notified of the turning direction, thereby improving the effectiveness of preventing motion sickness. The left light 311L and the right light 311R are preferably provided on the ceiling of the passenger compartment 3. The left and right light-emitting devices 313 are preferably provided on the rear surface of the seat back 11 of the front seat 5, and the front and rear light-emitting devices 317 are preferably provided on the upper edge of the door trim. [Explanation of symbols]

[0112] 1: Motion sickness prevention system according to the first embodiment 2: Vehicles 5: Front seat (seat) 6: Rear seat (seat) 13: Navigation device (acquisition device) 15: Behavior sensor (acquisition device) 17: Terminal 16: Control device 27: Screen 27A: Application execution screen 30: Vehicle icon (icon) 40: Light-emitting area 101: Motion sickness prevention system according to the second embodiment 201: Motion sickness prevention system according to the third embodiment 301: Motion sickness prevention system according to the fourth embodiment 302: Biometric sensor 311L: Left lighting (light-emitting device) 311R: Right lighting (light-emitting device) 313: Left and right light emitting device (light emitting device)

Claims

1. A motion sickness prevention system for preventing motion sickness in a vehicle occupant, comprising: a terminal having a screen and held by the occupant; an acquisition device for acquiring behavior information regarding the behavior of the vehicle in which the occupant rides; a biosensor for acquiring biometric information of the occupant; and The terminal Displaying a light emitting area on the screen; Based on the behavior information acquired by the acquisition device, moving the light emitting area laterally as the vehicle turns; moving the light emitting area longitudinally when the vehicle accelerates or decelerates; The terminal determines whether or not the occupant has signs of motion sickness based on the biometric information acquired by the biometric sensor, and stops displaying the light-emitting area when it determines that the occupant does not have signs of motion sickness.

2. The motion sickness prevention system according to claim 1 , wherein the terminal sets the brightness or size of the light-emitting area based on the magnitude of acceleration or deceleration of the vehicle.

3. The terminal moving the light-emitting area to the left when the vehicle turns left; The motion sickness prevention system according to claim 1 , wherein the light-emitting area is moved to the right when the vehicle turns right.

4. The motion sickness prevention system according to claim 1 , wherein the terminal sets a moving speed of the light-emitting area based on a speed of the vehicle.

5. The motion sickness prevention system according to claim 1 , wherein the light-emitting area is constituted by a colored area.

6. the acquisition device includes a navigation device that sets a route to a destination; The motion sickness prevention system according to claim 1 , wherein the terminal determines whether the vehicle will turn based on the current location of the vehicle and the route.

7. The motion sickness prevention system according to claim 1 , wherein, when a predetermined application is being executed, the terminal displays the light-emitting area so as to overlap an edge of the execution screen of the application.

8. The motion sickness prevention system according to claim 7 , wherein the biological sensor is provided in a seat on which the passenger sits.

9. A motion sickness prevention system for preventing motion sickness in a vehicle occupant, comprising: a terminal held by the occupant; a biosensor for acquiring biometric information of the occupant; an acquisition device for acquiring behavior information regarding the behavior of a vehicle in which the occupant rides, The terminal displays the vehicle on a screen based on the behavior information acquired by the acquisition device. Displaying the behavior of A motion sickness prevention system that determines whether or not the occupant has signs of motion sickness based on the biometric information acquired by the biometric sensor, and stops displaying the behavior of the vehicle when it determines that the occupant does not have signs of motion sickness.

10. A terminal connected to a biosensor that acquires biometric information of a passenger and displays information on a screen to prevent the passenger from experiencing motion sickness, displaying a light-emitting area at the edge of the screen; acquiring behavior information regarding the behavior of a vehicle in which the occupant is riding; Based on the acquired behavior information, moving the light emitting area laterally as the vehicle turns; moving the light emitting area longitudinally when the vehicle accelerates or decelerates; A terminal that determines whether or not the occupant has signs of motion sickness based on the biometric information acquired by the biometric sensor, and stops displaying the light-emitting area when it determines that the occupant does not have signs of motion sickness.

11. A screen control method for preventing motion sickness, comprising: The process is executed by a central processing unit connected to a biometric sensor that acquires biometric information of an occupant holding the terminal with the screen, The central processing unit displaying a light-emitting area at the edge of the screen; acquiring behavior information relating to the behavior of the vehicle in which the occupant is riding; Based on the acquired behavior information, moving the light emitting area laterally as the vehicle turns; moving the light emitting area longitudinally when the vehicle accelerates or decelerates; A control method that acquires the biometric information from the biometric sensor, determines whether or not the occupant has signs of motion sickness based on the acquired biometric information, and stops displaying the light-emitting area when it is determined that the occupant does not have signs of motion sickness.

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