Visual signal generation method and vehicle

Abstract

The purpose of the present invention is to suppress a decrease in visibility and readability in the gaze of a central field of view of an occupant due to a vehicle behavior in a state in which the occupant gazes an object in a cabin of a vehicle. In the visual signal generation method, an acceleration of a vehicle is detected by a sensor (S1), and a visual signal flowing in the direction of the acceleration is output from a display visually recognizable by an occupant of the vehicle (S7, S8) on the basis of an output signal of the sensor.

Description

Technical Field

[0001] The present invention relates to a visual signal generation method and a vehicle. Background Art

[0002] In Patent Document 1 described below, there is a technique of supplementing an optical flow field generated when a vehicle moves that can be visually confirmed by an occupant through a peripheral vision by generating a light emission pattern of an optical column using a frame portion of glasses, thereby correcting visual information of an occupant who does not look outside the vehicle and reducing motion sickness.

[0003] Prior Art Documents

[0004] Patent Document

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-023539

[0006] Problems to be Solved by the Invention

[0007] However, in the technique of Patent Document 1, since an optical flow field is added corresponding to the vehicle speed, an optical flow field is always generated in the peripheral vision during driving, which may reduce visual recognition and readability during fixation in the central vision. Summary of the Invention

[0008] An object of the present invention is to suppress a decrease in visual recognition and readability during fixation in the central vision of an occupant due to vehicle behavior while the occupant is looking at an object inside the vehicle compartment.

[0009] In a visual signal generation method according to an aspect of the present invention, an acceleration of a vehicle is detected by a sensor, and a visual signal flowing in the direction of the acceleration is output from a display that can be visually recognized by an occupant of the vehicle based on an output signal of the sensor.

[0010] Advantages of the Invention

[0011] According to the present invention, it is possible to suppress a decrease in visual recognition and readability during fixation in the central vision of an occupant due to vehicle behavior while the occupant is looking at an object inside the vehicle compartment.

[0012] The objects and advantages of the present invention are embodied and achieved by the elements and combinations shown in the scope of the claims. The above general description and the following detailed description are only examples and explanations, and should not be construed as limiting the present invention as defined in the scope of the claims. Brief Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of an example of an optical flow field generation device according to an embodiment.

[0014] Figure 2It is a schematic diagram of an arrangement example of the longitudinal optical flow field generation unit and the lateral optical flow field generation unit.

[0015] Figure 3 (a) and (b) are schematic diagrams of the influence of the vehicle's acceleration on the visual recognition and readability of the occupants.

[0016] Figure 4 (a) and (b) are schematic diagrams of the application methods of the optical flow field when the vehicle accelerates and decelerates respectively.

[0017] Figure 5 (a) and (b) are schematic diagrams of the application methods of the optical flow field when the vehicle turns right and left respectively.

[0018] Figure 6 It is a flowchart of an example of the optical flow field generation method of the embodiment. Detailed Embodiment

[0019] (Configuration)

[0020] Figure 1 It is a schematic structural diagram of the optical flow field generation device of the embodiment. The optical flow field generation device 1 is provided on the vehicle and is used to generate an optical flow field corresponding to the vehicle movement in the field of view of the occupants, and to suppress the reduction of visual recognition and readability in the fixation of the central field of view of the occupants who are looking at the objects inside the vehicle due to the vehicle movement. The optical flow field generation device 1 includes: a longitudinal acceleration sensor 2, a lateral acceleration sensor 3, an illuminance sensor 4, a longitudinal optical flow field generation unit 5, a lateral optical flow field generation unit 6, and an arithmetic device 7.

[0021] The longitudinal acceleration sensor 2 detects the longitudinal acceleration (hereinafter sometimes referred to as "longitudinal acceleration") generated in the vehicle, and outputs an output signal indicating the detection result of the longitudinal acceleration to the arithmetic device 7.

[0022] The lateral acceleration sensor 3 detects the lateral (vehicle width direction) acceleration (hereinafter sometimes referred to as "lateral acceleration") generated in the vehicle, and outputs an output signal indicating the detection result of the lateral acceleration to the arithmetic device 7.

[0023] The illuminance sensor 4 detects the illuminance inside the vehicle compartment (that is, the brightness inside the vehicle compartment), and outputs an output signal indicating the illuminance inside the vehicle compartment to the arithmetic device 7.

[0024] The longitudinal optical flow field generation unit 5 is a display that outputs a visual signal flowing in the longitudinal direction of the vehicle. The lateral optical flow field generation unit 6 is a display that outputs a visual signal flowing in the lateral direction of the vehicle. The longitudinal optical flow field generation unit 5 and the lateral optical flow field generation unit 6 are arranged at positions where the occupants in the vehicle compartment can visually recognize them.

[0025] The longitudinal optical flow field generation unit 5 can generate an optical flow field flowing in the longitudinal direction of the vehicle in the peripheral vision of the occupant by outputting a visual signal flowing in the longitudinal direction of the vehicle. In addition, the lateral optical flow field generation unit 6 can generate an optical flow field flowing in the lateral direction of the vehicle in the peripheral vision of the occupant by outputting a visual signal flowing in the lateral direction of the vehicle.

[0026] The visual signals generated by the longitudinal optical flow field generation unit 5 and the lateral optical flow field generation unit 6 can be visual patterns such as light, graphics, patterns, images, etc. that apply visual stimuli to the occupant.

[0027] For example, the longitudinal optical flow field generation unit 5 includes a light emitting element array (strip-shaped light emitting elements) in which a plurality of light emitting elements are arranged in the longitudinal direction of the vehicle. By sequentially lighting the light emitting elements in the longitudinal direction of the vehicle, a visual signal flowing in the longitudinal direction of the vehicle is output, thereby applying a visual stimulus to the occupant to generate an optical flow field flowing in the longitudinal direction in the peripheral vision of the occupant.

[0028] In addition, for example, the lateral optical flow field generation unit 6 includes a light emitting element array (strip-shaped light emitting elements) in which a plurality of light emitting elements are arranged in the lateral direction of the vehicle. By sequentially lighting the light emitting elements in the lateral direction of the vehicle, a visual signal flowing in the lateral direction of the vehicle is output, thereby applying a visual stimulus to the occupant to generate an optical flow field flowing in the lateral direction in the peripheral vision of the occupant. For example, the longitudinal optical flow field generation unit 5 and the lateral optical flow field generation unit 6 can include light emitting diodes (LEDs: Light Emitting Diodes) as the plurality of light emitting elements.

[0029] The methods for the longitudinal optical flow field generation unit 5 and the lateral optical flow field generation unit 6 to apply visual stimuli to the occupant are not limited to light emitting elements, as long as they are methods for generating visual stimuli that can be visually recognized by the occupant. For example, it is also possible to generate an optical flow field flowing in a desired direction by sequentially changing the reflection surfaces and colors of a plurality of elements arranged in the direction in which the optical flow field should be generated.

[0030] Figure 2 It is a schematic diagram of a configuration example of the longitudinal optical flow field generation unit 5 and the lateral optical flow field generation unit 6. When the optical flow field generation unit is arranged in the rear seat, the lateral optical flow field generation units 6a and 6b can also be arranged on the back surfaces of the left front seat and the right front seat respectively corresponding to the left and right rear seats. In addition, the longitudinal optical flow field generation units 5a and 5b can also be arranged on the inner sides of the left rear door and the right rear door respectively.

[0031] When the optical flow field generation unit is arranged in the front seat, by installing the lateral optical flow field generation units 6a and 6b on the instrument panel or the like, it is also possible to deal with occupants who are looking at the car navigation or the like in the front seat. In addition, the longitudinal optical flow field generation units 5a and 5b can also be arranged on the inner sides of the left front door and the right front door respectively.

[0032] Refer to Figure 1 。The arithmetic unit 7 is an electronic circuit that controls the longitudinal optical flow field generation unit 5 and the lateral optical flow field generation unit 6 based on the longitudinal acceleration sensor 2, the lateral acceleration sensor 3, and the illuminance sensor 4.

[0033] For example, the arithmetic unit 7 can be a computer with peripheral components such as a processor and a storage device. The processor can be, for example, a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit). The storage device can include a semiconductor storage device, a magnetic storage device, an optical storage device, etc. The storage device can contain memories such as registers, caches, a ROM (Read Only Memory) used as the main storage device, and a RAM (Random Access Memory).

[0034] The functions of the arithmetic unit 7 described below are realized, for example, by causing the processor to execute a computer program stored in the storage device. In addition, the arithmetic unit 7 can also be formed by dedicated hardware for executing each information process described below. For example, the arithmetic unit 7 can also include a functional logic circuit set in a general-purpose semiconductor integrated circuit. For example, the arithmetic unit 7 can also have a PLD (PLD: Programmable Logic Device) such as an FPGA (FPGA: Field-Programmable Gate Array).

[0035] Next, refer to Figure 3 Figure (a) and Figure 3 Figure (b) to explain the visual effects of vehicle acceleration and deceleration when the occupant is looking at an object inside the vehicle compartment.

[0036] When the occupant is looking at an object inside the vehicle compartment (for example, when reading a book or watching / listening to a smartphone inside the vehicle compartment), regardless of the longitudinal acceleration and the lateral acceleration, the head, which is the body part of the occupant farthest from the seat surface, is likely to move.

[0037] For example, in Figure 3 the example of Figure (a), if a forward acceleration is generated as shown by arrow 10 due to vehicle acceleration, a backward inertial acceleration acts on the occupant, and the occupant's head tilts backward in the direction of arrow 11. In Figure 3 the example of Figure (b), when a backward acceleration is generated in the direction of arrow 12 due to vehicle deceleration, a forward inertial acceleration acts on the occupant, and the occupant's head tilts forward in the direction of arrow 13.

[0038] On the other hand, a fixation object 14 (book or smartphone) supported at hand is less likely to shake than the head. At this time, the occupant is fixating on the fixation object 14 near the central visual field 15 of vision. Therefore, if the fixation at the central visual field 15 is not smooth, it may reduce the visual recognition and readability of the object. Thus, in order to continuously fixate on the place where the eyeball is fixating, when the head with the eyeball undergoes pitching motion and rolling motion due to vehicle acceleration, the eyeball rotates to eliminate this situation.

[0039] On the other hand, in the region of the peripheral visual field 16, although the image is not clearly imaged, the ability to detect movement is high, and an optokinetic response (OKR: Opt-Kinetic-Response) that receives this movement (optical flow field 17) and corrects the orientation of the eyeball subconsciously is generated.

[0040] When fixating on the fixation object 14, if an optical flow field 17 accompanied by head movement occurs in the peripheral visual field 16 far from its central visual field 15, it may cause an optokinetic response, and as a result, it may affect the fixation in the central visual field 15, deteriorating readability and visual recognition.

[0041] Thus, the arithmetic device 7 generates an optical flow field in the opposite direction to the optical flow field 17 through the longitudinal optical flow field generation unit 5 and / or the lateral optical flow field generation unit 6 in order to reduce the influence of the optical flow field 17 caused by head movement.

[0042] Figure 4 (a) is a schematic diagram of the application method of the optical flow field when the vehicle is accelerating. An occupant viewing a fixation object 14 (book or smartphone) at hand is subject to a backward inertial acceleration caused by the vehicle's acceleration, but especially during the period of fixating on the object at hand, the head is in a floating state. Therefore, as shown by the arrow 11, due to the inertial acceleration, the head pitches in the backward tilt direction. Since the occupant continues to fixate, the eyeball moves in coordination with the pitching motion of the head to maintain the fixation point 20.

[0043] As a result, the virtual projection point P of the occupant's line of sight moves in the direction of the arrow 21 (forward or upward), so that the image in the peripheral visual field 16 moves in the opposite direction (backward or downward). Therefore, the eyeball recognizes the movement in the peripheral visual field 16 as the optical flow field 17. Due to the optical flow field 17 in the peripheral visual field 16, it may cause subconscious control of the eyeball, namely the oculomotor reflex and the optokinetic response, and cause the eyeball to move.

[0044] Thus, in the part that enters the peripheral visual field 16 when the occupant is performing a fixation activity, such as the inner side of the vehicle door of the car body, a longitudinal optical flow field generation unit 5 capable of generating an optical flow field with a light column is arranged in the longitudinal direction of the vehicle.

[0045] As described above, in the head pitching motion caused by acceleration, the images of the ground, the front seat back, etc. that enter the peripheral vision 16 generate an optical flow field 17 that flows backward (or downward) in the peripheral vision. In a manner such that the optical flow field 22 that eliminates the influence of the optical flow field 17 flows forward (or upward) in the peripheral vision 16, a light beam 23 that flows from the rear of the vehicle to the front of the vehicle is output from the longitudinal optical flow field generation unit 5, thereby reducing the influence of the optical flow field 22 caused by the head pitching motion. That is, a visual signal that flows forward in the direction of the acceleration generated by acceleration, that is, a visual signal that flows forward in the direction opposite to the orientation (rearward) of the inertial acceleration acting on the occupant due to acceleration, is output from the longitudinal optical flow field generation unit 5.

[0046] Thereby, by suppressing the unwanted eye movement response, fixation becomes easier, and readability and visual recognition can be improved.

[0047] Figure 4 (b) is a schematic diagram of a method for applying the optical flow field when the vehicle decelerates. When the vehicle decelerates, as shown by the arrow 13, due to inertia, the head pitches in the forward tilting direction. Since the occupant continues to fixate, the eyes move in coordination with the head pitching motion to maintain the fixation point 20. As a result, the virtual projection point P of the occupant's line of sight moves in the direction of the arrow 24 (rearward or downward), and the image in the peripheral vision 16 moves in the opposite direction (forward or upward), so the eyes recognize the movement in the peripheral vision 16 as the optical flow field 17.

[0048] Thereby, the images of the ground or the front seat back, etc. that enter the peripheral vision 16 due to the head pitching motion caused by deceleration generate an optical flow field 17 that flows forward (or upward) in the peripheral vision. In a manner such that the optical flow field 25 that eliminates the influence of the optical flow field 17 flows backward (or downward) in the peripheral vision 16, a light beam 26 that flows from the front of the vehicle to the rear of the vehicle is output from the longitudinal optical flow field generation unit 5, thereby reducing the optical flow field 25 caused by the head pitching motion. That is, a visual signal that flows backward in the direction of the acceleration generated by deceleration, that is, a visual signal that flows backward in the direction opposite to the direction (forward) of the inertial acceleration acting on the occupant due to deceleration, is output from the longitudinal optical flow field generation unit 5.

[0049] Figure 5Fig. (a) is a schematic view of an application method of an optical flow field when a vehicle makes a right turn. When the vehicle makes a right turn, an inertial acceleration acts on the occupant in the leftward direction. Therefore, as shown by arrow 30, the occupant generates a roll attitude angle in the leftward direction. Since the occupant continues to gaze, the line of sight is maintained by moving the eyeball along with the roll movement of the head, thereby maintaining the fixation point 31. As a result, the virtual projection point P of the occupant's line of sight moves in the direction of arrow 32 (rightward), and the image in the peripheral vision 16 moves in the opposite direction, i.e., leftward. Therefore, the eyeball recognizes the movement in the peripheral vision 16 as the optical flow field 33.

[0050] Then, at a position where the peripheral vision 16 enters when the occupant is gazing, a lateral optical flow field generation unit 6 capable of generating an optical flow field with an optical column in the vehicle's lateral direction is arranged. For example, the lateral optical flow field generation unit 6 for rear seat occupants is arranged on the back of the front seat, etc. Alternatively, the lateral optical flow field generation unit 6 for front seat occupants may be arranged on the instrument panel, etc.

[0051] Then, an optical flow field 34 for eliminating the influence of the optical flow field 33 flows in the rightward direction of the peripheral vision 16. An optical column 35 flowing from the left side to the right side of the vehicle is output from the lateral optical flow field generation unit 6, thereby reducing the influence of the optical flow field caused by the head roll movement. That is, a visual signal flowing in the rightward direction of the vehicle width direction, which is the direction of the acceleration generated by the right turn, is output from the lateral optical flow field generation unit 6. In other words, a visual signal flowing in the rightward direction, which is the opposite direction to the direction (leftward in the vehicle width direction) of the inertial acceleration acting on the occupant due to the right turn, is output from the lateral optical flow field generation unit 6.

[0052] Figure 5 Fig. (b) is a schematic view of an application method of an optical flow field when a vehicle makes a left turn. When the vehicle makes a left turn, an inertial acceleration acts on the occupant in the rightward direction. Therefore, as shown by arrow 36, the occupant generates a roll attitude angle in the rightward direction. Since the occupant continues to gaze, the line of sight is maintained by moving the eyeball along with the roll movement of the head, thereby maintaining the fixation point 31. As a result, the virtual projection point P of the occupant's line of sight moves in the direction of arrow 37 (leftward), and the image in the peripheral vision 16 moves in the opposite direction, i.e., rightward. Therefore, the eyeball recognizes the movement in the peripheral vision 16 as the optical flow field 38.

[0053] Then, in a manner such that the optical flow field 39 that eliminates the influence of the optical flow field 38 flows toward the left direction of the peripheral vision 16, an optical flow 40 flowing from the right side of the vehicle to the left side of the vehicle is output from the lateral optical flow field generation unit 6. Thereby, the influence of the optical flow field caused by the head roll motion can be reduced. That is, a visual signal flowing toward the left side in the vehicle width direction, which is the direction of the acceleration generated by a left turn, is output from the lateral optical flow field generation unit 6. In other words, a visual signal flowing toward the left side, which is the opposite direction to the direction (right side in the vehicle width direction) of the inertial acceleration acting on the occupant due to a left turn, is output from the lateral optical flow field generation unit 6.

[0054] Figure 6 It is a flowchart of an example of the optical flow field generation method of the embodiment.

[0055] In step S1, the longitudinal acceleration sensor 2 detects the longitudinal acceleration ax. In addition, the lateral acceleration sensor 3 detects the lateral acceleration ay.

[0056] In step S2, the illuminance sensor 4 detects the illuminance inside the vehicle compartment of the vehicle (that is, the brightness inside the vehicle compartment).

[0057] In step S3, the arithmetic device 7 determines whether at least one of the absolute value of the longitudinal acceleration ax detected in step S1 and the absolute value of the lateral acceleration ay is greater than a specified threshold. When both the absolute value of the longitudinal acceleration ax and the absolute value of the lateral acceleration ay are below the threshold (step S3: No), the process proceeds to step S4.

[0058] In step S4, the arithmetic device 7 sets the elapsed time cumulative value T to 0. Then, the process proceeds to step S9.

[0059] When at least one of the absolute value of the longitudinal acceleration ax and the absolute value of the lateral acceleration ay is greater than the threshold in the determination of step S3 (step S3: Yes), the process proceeds to step S5.

[0060] In step S5, the arithmetic device 7 updates T by adding the elapsed time Δt to the elapsed time cumulative value T. The elapsed time Δt can be, for example, the length of one cycle of the control loop that repeats steps S1 to S9.

[0061] In step S6, the arithmetic device 7 sets the brightness of the optical flow field generated by the longitudinal optical flow field generation unit 5 and / or the lateral optical flow field generation unit 6 according to the elapsed time cumulative value T and the brightness inside the vehicle compartment obtained through step S2. For example, the arithmetic device 7 can increase the brightness of the optical flow field when the elapsed time cumulative value T is short compared to when it is long. For example, the shorter the elapsed time cumulative value T, the higher the brightness of the optical flow field can be increased. Thereby, effects such as promoting the reduction of the eye movement response caused by the generation of the optical flow field can be obtained.

[0062] In step S7, when the absolute value of the lateral acceleration ay is greater than the threshold, the arithmetic unit 7 causes the lateral optical flow field generation unit 6 to operate according to the magnitude and direction of the lateral acceleration ay to generate a lateral optical flow field. For example, when the lateral acceleration ay is large, a faster optical flow field can be generated than when it is small. For example, the larger the lateral acceleration ay, the faster the optical flow field can be generated. For example, an optical flow field having a speed proportional to the magnitude of the lateral acceleration ay can be generated.

[0063] In step S8, when the absolute value of the longitudinal acceleration ax is greater than the threshold, the arithmetic unit 7 causes the longitudinal direction optical flow field generation unit 5 to operate according to the magnitude and direction of the longitudinal acceleration ax to generate a longitudinal direction optical flow field. For example, when the longitudinal acceleration ax is large, a faster optical flow field can be generated than when it is small. For example, the larger the longitudinal acceleration ax, the faster the optical flow field can be generated. For example, an optical flow field having a speed proportional to the magnitude of the longitudinal acceleration ax can be generated. Then, the process proceeds to step S9.

[0064] In step S9, the arithmetic unit 7 determines whether the ignition key of the vehicle has been switched to the off position. When the ignition key has not been switched to the off position (step S9: No), the process returns to step S1. When the ignition key has been switched to the off position (step S9: Yes), the process ends.

[0065] (Modification example)

[0066] In the above description, the case where the front of the occupant seat faces forward in the longitudinal direction of the vehicle is described, but the present invention can also be applied when the front of the occupant seat faces the lateral direction of the vehicle. In this case, in the above description, by swapping the longitudinal direction and the lateral direction of the vehicle, the same effect can be obtained.

[0067] In addition, when the front of the occupant seat faces the rear in the longitudinal direction of the vehicle, in the above description, by swapping the front and the rear and swapping the left direction and the right direction, the same effect can also be obtained.

[0068] (Effects of the embodiment)

[0069] (1) The longitudinal acceleration sensor 2 and the lateral acceleration sensor 3 detect the acceleration of the vehicle. The arithmetic unit 7 outputs visual signals flowing along the direction of the acceleration of the vehicle from the longitudinal direction optical flow field generation unit 5 and the lateral optical flow field generation unit 6 respectively based on the output signals of the longitudinal acceleration sensor 2 and the lateral acceleration sensor 3.

[0070] Accordingly, an optical flow field can be generated that cancels out the influence of the optical flow field generated in the area of the occupant's peripheral vision when the occupant's head moves due to vehicle acceleration. As a result, a decrease in visual recognition and readability during fixation of the occupant's central vision can be suppressed.

[0071] (2) The arithmetic unit 7 can be controlled in such a way that the speed at which the visual signal flows corresponds to the acceleration.

[0072] Accordingly, an optical flow field can be generated such that the speed of the generated optical flow field is proportional to the vehicle acceleration and the influence of the optical flow field in the occupant's peripheral vision caused by the movement of the occupant proportional to the vehicle acceleration can be canceled out.

[0073] (3) The longitudinal optical flow field generation unit 5 can output a visual signal flowing forward in the longitudinal direction of the vehicle when the vehicle is accelerating, and output a visual signal flowing backward in the longitudinal direction of the vehicle when the vehicle is decelerating.

[0074] Accordingly, the direction of the optical flow field in the peripheral vision area for canceling out the influence of the optical flow field generated by the movement of the occupant's head due to the acceleration and deceleration of the vehicle can be specified.

[0075] (4) The lateral optical flow field generation unit 6 outputs a visual signal flowing to the right in the vehicle width direction when the vehicle is turning right, and outputs a visual signal flowing to the left in the vehicle width direction when the vehicle is turning left.

[0076] Accordingly, the direction of the optical flow field in the peripheral vision area for canceling out the influence of the optical flow field generated by the movement of the occupant's head caused by the lateral movement (turning) of the vehicle can be specified.

[0077] All the examples and conditional terms described herein are for teaching purposes to help the reader understand the present invention and the concepts provided by the inventors for technological progress, and should not be construed as being limited to the above examples and conditions specifically described in this specification and the structures of the examples showing the superiority and inferiority of the present invention. The embodiments of the present invention have been described in detail, but it should be understood that various changes, substitutions, and modifications can be added thereto without departing from the spirit and scope of the present invention.

[0078] Reference Signs

[0079] 1: Optical flow field generation device, 2: Longitudinal acceleration sensor, 3: Lateral acceleration sensor, 4: Illuminance sensor, 5: Longitudinal optical flow field generation unit, 5a: Longitudinal optical flow field generation unit, 5b: Longitudinal optical flow field generation unit, 6: Lateral optical flow field generation unit, 6a: Lateral optical flow field generation unit, 6b: Lateral optical flow field generation unit, 7: Arithmetic unit.

Claims

1. A method for generating a visual signal, characterized in that: The acceleration of the vehicle is detected by a sensor; Based on the output signal of the sensor, a visual signal flowing in the direction of the acceleration is output from a display that can be visually recognized by an occupant of the vehicle.

2. The method for generating a visual signal according to claim 1, characterized in that: It is controlled in such a way that the speed at which the visual signal flows corresponds to the magnitude of the acceleration.

3. The method for generating a visual signal according to claim 2, characterized in that: When the vehicle is accelerating, the visual signal flowing forward in the longitudinal direction of the vehicle is output, and when the vehicle is decelerating, the visual signal flowing backward in the longitudinal direction of the vehicle is output.

4. The method for generating a visual signal according to claim 2, characterized in that: When the vehicle is turning right, the visual signal flowing to the right in the vehicle width direction of the vehicle is output, and when the vehicle is turning left, the visual signal flowing to the left in the vehicle width direction of the vehicle is output.

5. A vehicle, characterized in that, Comprising: A sensor that detects the acceleration of the vehicle; A display that outputs a visual signal flowing in the direction of the acceleration based on the output signal of the sensor, The display is arranged at a position where it can be visually recognized by an occupant of the vehicle.

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