Space control system, space control method, and vehicle equipped with space control system

Abstract

This space control system comprises a control device (50) that performs control to display a video content on a transparent display (16) disposed inside a space. In at least a partial period in a first phase in which a user is guided to rest, the resolution (R) of the video content displayed on the transparent display (16) decreases according to an elapsed time (t).

Description

Space control system, space control method, and vehicle equipped with space control system

[0001] The present disclosure relates to a space control system for adjusting the state within a space, a space control method, and a vehicle equipped with the space control system.

[0002] Patent Document 1 discloses a wake-up device provided in a vehicle that suppresses a feeling of annoyance by a passenger. Specifically, the wake-up device has a wake-up determination unit and a stimulus determination unit. The wake-up determination unit determines the wakefulness of a passenger in the vehicle. The stimulus determination unit causes an image display unit to present an image including a wake-up video with blurring applied to an end side including a boundary with a background image to the passenger according to the wakefulness determined by the wake-up determination unit. Thereby, a feeling of annoyance by the passenger is suppressed, and a visual stimulus for enhancing the wakefulness of the passenger is given to the passenger.

[0003] The wake-up device of Patent Document 1 has a configuration in which the resolution of the video increases as the drowsiness of the passenger becomes stronger, and is not configured to induce the passenger to rest. That is, there is room for improvement in terms of inducing the passenger to rest without imposing a load on the passenger.

[0004] Japanese Unexamined Patent Application Publication No. 2022-151067

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a space control system, a space control method, and a vehicle equipped with the space control system that can induce rest without imposing a load on a user.

[0006] A space control system according to an aspect of the present disclosure includes a display device disposed inside the space and a control device that performs control to display video content on the display device, and the resolution of the video content decreases according to the elapsed time during at least a part of a first phase of inducing a user to rest.

[0007] With this configuration, during at least a portion of the first phase in which the user is guided to rest, the resolution of the video content decreases over time, gradually reducing the intensity of visual stimulation on the user and allowing the user to be guided to rest without burdening them.

[0008] Figure 1 shows an example of a top view of a vehicle equipped with a display unit. Figure 2 shows an example of a side view of the vehicle. Figure 3 shows the passenger compartment as seen from the rear of the vehicle. Figure 4 is a block diagram illustrating the control function of a control device that controls a spatial control system that adjusts the conditions within the passenger compartment. Figure 5 is a flowchart illustrating the control flow by the control device. Figure 6 shows the temporal change in brightness of video content displayed on a transparent display. Figure 7 shows the temporal change in resolution of video content displayed on a transparent display. Figure 8 is an example of video content displayed on a transparent display during the deep breathing phase, sleep phase, and wakefulness phase. Figure 9 shows the relationship between spatial frequency and power in a predetermined image in Figure 8. Figure 10 shows the resolution when the resolution is changed according to the elapsed time, and the resolution when the resolution is kept constant for each of the sleep and wakefulness phases. Figure 11 shows the experimental results evaluating ease of falling asleep under two conditions: Condition 1, where the resolution of the video content in the sleep phase was kept constant, and Condition 2, where the resolution of the video content was gradually decreased. Figure 12 shows experimental results evaluating the likelihood of awakening under two conditions: Condition 1, where the resolution of the video content during the awakening phase was kept constant, and Condition 2, where the resolution of the video content was gradually increased. Figure 13 is a flowchart illustrating the control flow by the control device corresponding to the second embodiment.

[0009] [Underlying Knowledge] Research is underway on technologies that use multiple devices, such as display devices, sound devices, and lighting devices, to control the state of a space and guide users to an appropriate state.

[0010] Incidentally, in the past, high-resolution images were projected onto the display device to induce users to rest. This provided users with strong visual stimulation, making it difficult to induce rest without burdening them.

[0011] Therefore, the inventors realized that the above problem could be solved by changing the resolution of the image projected onto the display device in order to induce the user to rest, and thus came up with the following aspects of this disclosure.

[0012] (1) A spatial control system in one aspect of the present disclosure includes a control device that controls the display of video content on a display device located inside the space, wherein the resolution of the video content decreases in proportion to the elapsed time during at least a portion of the first phase in which the user is guided to rest.

[0013] According to the above embodiment, during at least a portion of the first phase in which the user is guided to rest, the resolution of the video content decreases in accordance with the elapsed time, thereby gradually reducing the intensity of visual stimulation on the user. This makes it possible to guide the user to rest while suppressing the burden on the user.

[0014] (2) In the spatial control system described in (1) above, the resolution of the video content increases in proportion to the elapsed time during at least a portion of the second phase in which the user is guided to wakefulness.

[0015] According to the embodiment described in (2) above, during at least a portion of the second phase in which the user is guided to wakefulness, the resolution of the video content increases in accordance with the elapsed time, thus enabling the user to be guided to wakefulness without imposing any burden on them.

[0016] (3) In the spatial control system described in (2) above, if the point in time when the resolution of the video content begins to decrease in the first phase is defined as the first point in time, and the point in time when the resolution of the video content ends to increase in the second phase is defined as the second point in time, the resolution at the second point in time is higher than the resolution at the first point in time.

[0017] According to the embodiment described in (3) above, since the resolution at the second time point is higher than the resolution at the first time point, the user can be reliably guided to wakefulness at the second time point.

[0018] (4) In the spatial control system described in (2) above, the gradient of change during the first period in the first phase in which the resolution of the video content decreases is lower than the gradient of change during the second period in the second phase in which the resolution of the video content increases.

[0019] According to the embodiment described in (4) above, in the first period of the first phase, the resolution of the video content gradually decreases, so that the user can be guided to rest while suppressing discomfort caused by the decrease in resolution. Furthermore, in the second period of the second phase, the resolution of the video content increases more rapidly than in the first phase, so that the user can be given an appropriate amount of visual stimulation and guided to wakefulness.

[0020] (5) In the spatial control system described in any of (1) to (4) above, during at least a portion of the period in which the resolution of the video content decreases with time, the color of the outer edge of the video content corresponds to the color of the frame surrounding the display area of ​​the display device.

[0021] According to the embodiment of (5) above, the color of the outer edge of the video content corresponds to the color of the frame surrounding the display area of ​​the display device, making it difficult for the user to recognize the boundary between the outer edge of the video content and the frame of the display device, thereby suppressing the visual stimulation caused by the user recognizing the boundary.

[0022] (6) In the spatial control system described in any of (1) to (5) above, the display device is positioned between the front and rear seats of the vehicle, and for at least a portion of the time during which the resolution of the video content decreases with time, the video content includes video moving in the same direction as the direction of travel of the vehicle.

[0023] According to the embodiment described in (6) above, since the video content is a video that moves in the same direction as the vehicle's direction of travel, it is possible to suppress motion sickness in the user while guiding the user to rest.

[0024] (7) In the spatial control system described in any of (1) to (6) above, a lighting device is provided which is located in at least part of the vicinity of the display device, and the control device illuminates the lighting device with light corresponding to the color of the video content.

[0025] According to the embodiment of (7) above, by illuminating the lighting device with light corresponding to the color of the video content, it is possible to further reduce the burden on the user while guiding the user to rest and wakefulness.

[0026] (8) In the spatial control system described in any of (1) to (7) above, the control device performs a process to change the resolution of the video content according to the elapsed time.

[0027] According to the embodiment of (8) above, by changing the resolution of the video content through the actions of the control device, the amount of data of the video content can be reduced compared to the case in which video content whose resolution changes according to the elapsed time is prepared in advance.

[0028] (9) A spatial control method according to one aspect of the present disclosure includes a computer causing video content to be displayed on a display device, wherein the resolution of the video content displayed on the display device decreases over time for at least a portion of the first phase in which the user is guided to rest.

[0029] According to the embodiment of (9) above, the computer can induce rest without burdening the user because, for at least a portion of the first phase, the resolution of the video content decreases in proportion to the elapsed time.

[0030] (10) A vehicle according to one aspect of the present disclosure comprises a display device located inside the vehicle and a control device that controls the display of video content on the display device, wherein the resolution of the video content is reduced in proportion to the elapsed time for at least a portion of the first phase in which the user is guided to rest.

[0031] According to the embodiment of (10) above, during at least a portion of the first phase in which the user riding in the vehicle is guided to rest, the resolution of the video content decreases in accordance with the elapsed time, so that the intensity of the visual stimulus on the user gradually decreases, and the user can be guided to rest while suppressing the burden on the user.

[0032] (11) A spatial control program according to one aspect of the present disclosure causes a computer to display video content on a display device and, for at least a portion of the first phase in which the user is guided to rest, to reduce the resolution of the video content displayed on the display device in proportion to the elapsed time.

[0033] According to the embodiment of (11) above, for at least a portion of the first phase, the resolution of the video content displayed on the display device decreases in accordance with the elapsed time, so that the intensity of the visual stimulus on the user gradually decreases and the user can be guided to rest without being burdened.

[0034] The embodiments described below are all specific examples of the present disclosure. The numerical values, shapes, components, steps, and order of steps shown in the following embodiments are examples only and do not limit the present disclosure. Furthermore, among the components in the following embodiments, those components that are not described in the independent claim representing the highest-level concept will be described as optional components.

[0035] [First Embodiment] Figure 1 is a diagram showing an example of a top view of a vehicle 10 in the first embodiment of the present disclosure. Figure 2 is a side view of the vehicle 10 as seen from one side in the left-right direction (X direction). In the following description, as shown in the lower right of Figure 1 and the lower right of Figure 2, the direction of travel of the vehicle 10 will be indicated as the front-rear direction or Y direction, the direction perpendicular to the ground on which the vehicle 10 travels will be indicated as the up-down direction or Z direction, and the direction perpendicular to the front-rear direction (Y direction) and the up-down direction (Z direction) will be indicated as the left-right direction (vehicle width direction) or X direction.

[0036] The vehicle 10 consists of, for example, a passenger car, a taxi, etc. Inside the passenger compartment 8 of the vehicle 10, various devices are provided, including front seats 12, rear seats 14, a transparent display 16 positioned between the front seats 12 and the rear seats 14, an acoustic device 18 positioned near the transparent display 16 and the rear seats 14, a lighting device 20 (see Figure 3), and a fragrance generating device 24.

[0037] The front seats 12 include the driver's seat of the vehicle 10. The rear seats 14 do not include the driver's seat of the vehicle 10. For example, if the vehicle 10 is a so-called three-row seat vehicle, and the first row of seats includes the driver's seat and the passenger seat, then the seats including the second row and the third row of seats may be the rear seats, and the driver's seat and passenger seat including the first row of seats may be the front seats. Alternatively, the seats including the third row of seats may be the rear seats, and the driver's seat and passenger seat including the first row of seats, and the seats including the second row of seats may be the front seats.

[0038] The transparent display 16 is positioned between the rear seat 14 and the front seat 12 inside the vehicle interior space 8. The transparent display 16 is a plate-shaped transparent member and has a transparent rectangular display surface 26 on the rear seat 14 side for displaying video content. The transparent display 16 displays video content on the display surface 26 under the control of a control device 50, which will be described later. The transparent display 16 is made of, for example, transparent organic EL. The transparent display 16 has a constant light transmittance of 80% or more, 90% or more, or 100%. Note that the transparent display 16 is an example of a display device of this disclosure.

[0039] Alternatively, a transparent dimming film (dimming sheet) may be placed on the back of the transparent display 16, opposite to the display surface 26, and its light-shielding rate (transmittance) on the back may be adjusted under the control of the control device 50. Alternatively, a projector may be installed above the rear of the rear seat 14 of the vehicle 10, and the transparent display 16 may be made of translucent glass. In this case, under the control of the control device 50, the projector will project video content onto the display surface 26 of the glass, thereby displaying the video content on the display surface 26. Even in this case, the transparent display 16 is positioned between the rear seat 14 and the front seat 12 of the vehicle 10.

[0040] The sound device 18 generates sound in the vehicle interior space 8 under the control of the control device 50. The sound device 18 is composed of, for example, speakers. In this embodiment, multiple sound devices 18 are arranged near the transparent display 16 and the rear seats 14. For example, the sound devices 18 may be arranged above and below the transparent display 16 and on the headrests. However, the arrangement of the sound devices 18 is not limited to the above. For example, the sound devices 18 may be arranged on both the left and right sides in the left-right direction (X direction) of the transparent display 16.

[0041] The fragrance generator 24 generates a fragrance within the vehicle interior space 8 by releasing or diffusing a predetermined fragrance under the control of the control device 50. The fragrance generator 24 is, for example, located in the center of the vehicle 10 in the left-right direction and generates the fragrance under the control of the control device 50. The fragrance generator 24 may consist of, for example, a diffuser that releases or diffuses a fragrance.

[0042] Figure 3 is a view of the passenger compartment 8 from the rear of the vehicle. As shown in Figure 3, a rectangular transparent display 16 is positioned in front of the rear seats 14. The lighting system 20 includes a lower lighting device 20A, a pair of left and right side lighting devices 20B, an upper lighting device 20C, a first ceiling lighting device 20D, and a pair of left and right second ceiling lighting devices 20E. All of these lighting devices 20 are formed in an elongated shape.

[0043] The lower lighting device 20A, the side lighting device 20B, and the upper lighting device 20C are arranged so as to surround the periphery of the transparent display 16 and are arranged on a plane parallel to the display surface 26 of the transparent display 16. When these lighting devices 20 (from 20A to 20C) are arranged on a plane parallel to the display surface 26 of the transparent display 16, when a passenger views the display surface 26 of the transparent display 16, the lighting devices 20 (from 20A to 20C) arranged on a plane parallel to the transparent display 16 are also included in the passenger's field of vision. Therefore, by adjusting the light quantity and color of the illumination light of each of these lighting devices 20 (from 20A to 20C), the passenger can be induced to rest and wake up.

[0044] The lower lighting device 20A is provided at the lower part of the transparent display 16. The lower lighting device 20A is arranged such that its longitudinal direction is along the longitudinal direction (left - right direction, X - direction) of the transparent display 16. The left and right side lighting devices 20B are provided on both the left and right sides of the transparent display 16 and are arranged along the vertical direction (Z - direction) of the transparent display 16. The upper lighting device 20C is provided at the upper part of the transparent display 16 and is arranged along the longitudinal direction (left - right direction, X - direction) of the transparent display 16.

[0045] The first ceiling lighting device 20D is provided on the ceiling of the passenger compartment space 8 and is arranged such that its longitudinal direction is along the left - right direction (X - direction) of the vehicle 10. The second ceiling lighting device 20E is provided on both sides in the left - right direction of the vehicle 10 respectively. The second ceiling lighting device 20E is arranged such that its longitudinal direction is along the front - rear direction (Y - direction) of the vehicle 10. The rear end in the front - rear direction of the second ceiling lighting device 20E may extend rearward beyond the front end of the rear seat 14.

[0046] FIG. 4 is a block diagram for explaining the control functions of a control device 50 that controls a space control system 100 for adjusting the state within the passenger compartment space 8. The space control system 100 includes a transparent display 16, an acoustic device 18, a lighting device 20, an aroma generating device 24, a control device 50, and a storage unit 70. By using these devices, the space control system 100 is a system that switches the passenger compartment space 8 into a plurality of phases including a sleep phase and a wake-up phase described later, and adjusts the passenger compartment space 8 into a space suitable for the passengers. Hereinafter, the explanation will be centered on the sleep phase and the wake-up phase, but it may be configured to be switchable to other phases such as a deep breathing phase described later.

[0047] The control device 50 is composed of a computer including a central processing unit (processor or CPU) and a storage device such as a ROM and a RAM. The processor acquires and executes a program stored in the storage device to execute various processes including control related to the display of the transparent display 16. The control device 50 is connected to a video control unit 54, an acoustic control unit 56, a lighting control unit 58, and an aroma control unit 60. The control device 50 may be mounted on an ECU (Electronic Control Unit) provided in the vehicle 10, or may be composed of a control device of the space control system 100 different from the ECU.

[0048] The control device 50 determines whether it is the timing to switch from the deep breathing phase to the sleep phase, whether it is the timing to switch from the sleep phase to the wake-up phase, and whether it is the end timing of the wake-up phase.

[0049] The deep breathing phase is a phase that guides the passenger into a state where drowsiness is easily induced before entering the sleep phase, and specifically involves encouraging the passenger to take deep breaths. The sleep phase is conducted before the wake phase and is a phase that guides the passenger (user) into sleep. The wake phase is a phase that guides the passenger into wakefulness. By switching between the deep breathing phase, sleep phase, and wake phase in that order, the passenger can be guided into sleep and wakefulness. Note that the sleep phase is an example of the first phase of this disclosure, and the wake phase is an example of the second phase of this disclosure.

[0050] For example, when the elapsed time t from the start of the deep breathing phase reaches a first predetermined time stored in the memory unit 70, the control device 50 determines that it is time to end the deep breathing phase and switches from the deep breathing phase to the sleep phase.

[0051] For example, when the elapsed time t from the start of the deep breathing phase reaches a second predetermined time stored in the memory unit 70, the control device 50 determines that it is time to end the sleep phase and switches from the sleep phase to the wakefulness phase. The timing of the end of the sleep phase may also be determined based on the start time of the sleep phase.

[0052] For example, when the elapsed time t from the start of the deep breathing phase reaches a third predetermined time stored in the memory unit 70, the control device 50 determines that it is time to end the awakening phase and terminates the awakening phase. The timing of the end of the awakening phase may also be determined based on the start of the sleep phase or the start of the awakening phase.

[0053] The storage unit 70 is composed of a non-volatile, rewritable storage device such as a hard disk drive or a solid-state drive. The storage unit 70 may be a storage device built into the control device 50, or it may be a storage device provided separately from the control device 50.

[0054] The memory unit 70 pre-stores, for example, data for video content to be displayed on the transparent display 16. The memory unit 70 also pre-stores data for audio content to be played back on the sound device 18. Furthermore, the memory unit 70 pre-stores judgment values ​​for determining the end timing of the deep breathing phase, the sleep phase, and the wakefulness phase.

[0055] The video control unit 54 includes a drive circuit for driving the transparent display 16 and displays video content corresponding to each phase on the transparent display 16 according to a control signal from the control device 50. This control signal includes data for the video content to be displayed on the transparent display 16.

[0056] The sound control unit 56 includes a drive circuit (e.g., an amplifier) ​​that drives the sound device 18, and plays audio content corresponding to each phase according to a control signal from the control device 50. The sound control unit 56 plays audio content corresponding to, for example, the video content displayed on the transparent display 16. This control signal includes data for the audio content to be played by the sound device 18.

[0057] The lighting control unit 58 includes a drive circuit for driving each lighting device 20, and adjusts the brightness of each lighting device 20 (i.e., the illuminance of the vehicle interior space 8) and the color tone of the lighting light according to each phase in accordance with the control signal from the control device 50.

[0058] The fragrance control unit 60 includes a drive circuit for driving the fragrance generator 24 and controls the operation of the fragrance generator 24 according to each phase in accordance with the control signal from the control device 50. This control signal includes information indicating the type of fragrance to be diffused into the vehicle interior by the fragrance generator 24. Examples of fragrance types include forest scents and citrus scents.

[0059] Figure 5 is a flowchart illustrating the control flow by the control device 50, which guides the passenger from rest to wakefulness. This flowchart is executed, for example, according to a program (spatial control program) stored in the memory of the control device 50. This flowchart is also executed when the deep breathing phase begins.

[0060] When the deep breathing phase begins, the control device 50 outputs content that encourages deep breathing (step S10). The specific content of the deep breathing encouragement will be described later. Next, the control device 50 determines whether or not it is time to end the deep breathing phase (step S20). For example, the control device 50 determines the end timing of the deep breathing phase based on whether or not the elapsed time t from the start of the deep breathing phase has reached a predetermined first time. If the elapsed time t has not reached the predetermined first time (NO in step S20), the control device 50 continues to execute the deep breathing phase.

[0061] If the elapsed time t reaches a first predetermined time (YES in step S20), the control device 50 outputs content corresponding to the sleep phase (step S30). The specific content output during the sleep phase will be described later. Next, the control device 50 determines whether or not it is the end of the sleep phase (step S40). For example, the control device 50 determines the end of the sleep phase based on whether or not the elapsed time t from the start of the deep breathing phase has reached a preset second predetermined time. If the elapsed time t has not reached the second predetermined time (NO in step S40), the control device 50 continues to execute the sleep phase.

[0062] If the elapsed time t reaches a second predetermined time (YES in step S40), the control device 50 outputs content corresponding to the awakening phase (step S50). The specific content output during the awakening phase will be described later. Next, the control device 50 determines whether or not it is time to end the awakening phase (step S60). For example, the control device 50 determines the timing of the end of the awakening phase based on whether or not the elapsed time t from the start of the deep breathing phase has reached a preset third predetermined time. If the elapsed time t has not reached the third predetermined time (NO in step S60), the control device 50 continues to execute the awakening phase. If the elapsed time t reaches the third predetermined time (YES in step S60), the control device 50 ends the awakening phase.

[0063] The following describes the specific content output in each phase. First, the specific content in the deep breathing phase will be described. When the deep breathing phase begins, the video control unit 54, in accordance with the control signal from the control device 50, displays, for example, a message on the transparent display 16 instructing the passenger to take a deep breath, prompting the passenger to perform a deep breath. At this time, the passenger may be prompted to take a deep breath not only by the display on the transparent display 16 but also by sound, or by sound alone instead of the transparent display 16. For example, the sound control unit 56, in accordance with the control signal from the control device 50, generates sound from the sound device 18 to prompt the passenger to take a deep breath in conjunction with the display on the transparent display 16.

[0064] Furthermore, during the deep breathing phase, the video control unit 54 may, in accordance with the control signal from the control device 50, play on the transparent display 16 an image of, for example, an object representing lungs repeatedly expanding and contracting, prompting the passenger to take deep breaths in accordance with the movement of the object. At this time, the brightness Br of the video content may be darker than the brightness Br when the passenger is awake. Similarly, the resolution R of the video content may be lower than the resolution R when the passenger is awake.

[0065] Next, specific examples of content output during the sleep phase will be given. When the sleep phase begins, the video control unit 54 plays predefined video content to be used in the sleep phase on the transparent display 16. The video content used in the sleep phase should be relatively abstract images that are easy to guide the passenger to sleep (or rest).

[0066] The colors displayed on the transparent display 16 during the sleep phase may be soft hues. For example, the colors during the sleep phase may be pastel colors or light tones that enhance relaxation. Alternatively, the colors during the sleep phase may be natural colors that provide visual calmness. For example, blue, which corresponds to the color of the sky or sea; green, which corresponds to the color of forests or grasslands; and brown, which corresponds to the color of trees or soil may be used.

[0067] The subject of the sleep phase may be, for example, a natural landscape such as a mountain, sea, river, lake, forest, or grassland. Alternatively, the subject may be a gently moving animal or pet such as a bird, fish, cat, or dog. Alternatively, the subject may be flowers or trees, the way these flowers or trees sway in the wind, or leaves with water droplets on them. Alternatively, the subject may be the movement of water such as a flowing river, a rippling sea, a calm lake, or a waterfall. It may also be a landscape that combines these subjects.

[0068] The subject in the sleep phase may have relatively slow movements. For example, the movement of the subject could be the movement of waves, trees swaying in the wind, or the movement of clouds. Alternatively, the movement of the subject could be captured in slow motion. For example, the movement of the subject could be the opening of a flower or the moment a water droplet falls. Furthermore, the movement of the subject could be a natural, regular, and leisurely rhythm. For example, the movement of the subject could be the rhythm of waves at the water's edge.

[0069] The composition for the sleep phase can be simple and balanced to avoid visual clutter. Alternatively, the composition for the sleep phase can focus on natural elements. For example, the composition for the sleep phase could place a mountain or lake at the center of the landscape, drawing the viewer's gaze naturally. Alternatively, the composition for the sleep phase can utilize space, such as a wide open space or a composition that uses perspective to create a sense of openness.

[0070] The camera work during the sleep phase may be stable footage without camera shake. For example, the camera work during the sleep phase may be a fixed camera, panning to move the camera toward the subject, or tilting to move the camera up and down. The camera work during the sleep phase may also be to slowly zoom in or zoom out of the subject. Furthermore, the camera work during the sleep phase may be a natural camera angle that gives the passenger the feeling of being there.

[0071] While the examples of video content used in the sleep phase are given, the examples are not limited to those mentioned above. Any video that helps passengers relax and induce sleep (or rest) is acceptable. Furthermore, the video content mentioned above is not independent but rather a combination of videos as appropriate.

[0072] Furthermore, the audio content played during the sleep phase should be audio that helps the passenger relax. For example, the audio content played during the sleep phase may be audio that matches the video content. For example, if the video content for the sleep phase is a video of a flowing river, the sound control unit 56 may play the sound of the flowing river according to the control signal from the control device 50. Alternatively, the sound control unit 56 may play music that matches the video of the flowing river and helps the passenger relax.

[0073] Furthermore, the lighting control unit 58 may, in accordance with the control signal from the control device 50, illuminate each lighting device 20 with light corresponding to the color of the video content.

[0074] For example, the lighting control unit 58 may, in accordance with a control signal from the control device 50, illuminate a light from the lower lighting device 20A that is synchronized with the color of the lower part of the video content. By illuminating a light that is synchronized with the color of the lower part of the video content from the lower lighting device 20A located at the bottom of the transparent display 16, the color of the lower part of the video content and the light illuminating the lower part of the video content become synchronized, reducing visual stimulation. This makes it easier for passengers to fall asleep. The color of the lower part of the video content may be determined, for example, by calculating the average value of the colors in a predetermined area that includes the lower part of the video content.

[0075] Similarly, the lighting control unit 58 may, in accordance with the control signal from the control device 50, illuminate the side lighting device 20B with light that synchronizes with the color on each side of the video content. The lighting control unit 58 may also, in accordance with the control signal from the control device 50, illuminate the top lighting device 20C with light that synchronizes with the color on the top of the video content.

[0076] Furthermore, the video content used during the sleep phase may be configured such that its brightness Br decreases as the elapsed time t of the sleep phase progresses. In the following description, unless otherwise specified, brightness Br refers to the average value of brightness Br across the entire display area of ​​the component on which the video is projected (i.e., the transparent display 16).

[0077] Figure 6 shows the temporal change in the average brightness Br of the video content displayed on the transparent display 16. In Figure 6, the horizontal axis represents the elapsed time t [sec], and the vertical axis represents the brightness Br [cd / m^2] of the video content. In Figure 6, time point tA corresponds to the start of the deep breathing phase. Time point tB corresponds to the end of the deep breathing phase, i.e., the start of the sleep phase. Time point tBa corresponds to the point in the sleep phase when the brightness Br has decreased to a predetermined minimum value Brmin (minimum brightness). Time point tC corresponds to the end of the sleep phase, i.e., the start of the wake phase. Time point tD corresponds to the point in the wake phase when the brightness Br has reached a predetermined target brightness Br2.

[0078] As shown in Figure 6, at time tA, when the deep breathing phase begins, the brightness Br1 is already set to a predetermined value lower than that at time tD, when the awakening phase begins. Furthermore, from time tB onward, when the sleep phase begins, the brightness Br decreases according to the elapsed time t. As a result, the image in the sleep phase gradually darkens, and the passenger is naturally guided to sleep. Then, at time tBa, a predetermined time has elapsed from time tB, the brightness Br reaches its lowest value, Brmin. At this point, the transparent display 16 becomes a completely dark screen, and the passenger falls asleep.

[0079] Furthermore, during at least a portion of the sleep-onset phase, the resolution R of the video content may decrease in proportion to the elapsed time t.

[0080] The reduction in resolution R may be achieved by playing back video configured to gradually decrease in resolution R according to the elapsed time t. For example, video content used in the sleep phase, configured to gradually decrease in resolution R according to the elapsed time t, is pre-stored in the storage unit 70. When the sleep phase begins, the video control unit 54 plays back the video content stored in the storage unit 70 according to the control signal of the control device 50. This makes it possible to gradually reduce the resolution R of the video content.

[0081] Figure 7 shows the temporal change in the resolution R [ppi] of the video content displayed on the transparent display 16. The horizontal axis represents the elapsed time t [sec], and the vertical axis represents the resolution R of the video content. In Figure 6, time tA corresponds to the start of the deep breathing phase. Time tB corresponds to the end of the deep breathing phase, i.e., the start of the sleep phase. Time tBa corresponds to the point in the sleep phase when the resolution R decreases to a predetermined minimum value Rmin (minimum resolution). Time tC corresponds to the end of the sleep phase, i.e., the start of the wake phase. Time tD corresponds to the point in the wake phase when the resolution R reaches a predetermined target resolution R2.

[0082] As shown in Figure 7, at time tA when the deep breathing phase begins, the resolution R is a predetermined resolution R1, which is lower than that at time tD when the awakening phase begins. Furthermore, from time tB when the sleep phase begins onward, the resolution R gradually decreases according to the elapsed time t. At this time, the resolution R may decrease linearly or curvilinearly, as shown in Figure 7. Also, as shown in Figure 7, at time tBa, a predetermined time has elapsed from time tB, the resolution R may decrease to its minimum value Rmin, and then be maintained at the minimum value Rmin.

[0083] Furthermore, the brightness Br and resolution R during the sleep phase may be changed in conjunction with each other. Specifically, as shown in Figures 6 and 7, from time tB onward, when the sleep phase begins, the resolution R may decrease in accordance with the decrease in the brightness Br of the video content. Alternatively, at time tBa, when the brightness Br reaches its lowest value Brmin, the resolution R may decrease to its lowest value Rmin, and from time tBa onward, the resolution R may be maintained at its lowest value Rmin in accordance with the lowest value Rmin of brightness Br. At this time, the transparent display 16 may be in a completely dark state (i.e., blackout) where nothing is displayed.

[0084] The video content during the first period (from time tB to time tBa) in which the resolution R of the sleep phase gradually decreases may be video of the area in front of the vehicle 10 moving in the same direction as the vehicle's direction of travel. The video may be pre-recorded and stored video, or the area in front of the moving vehicle 10 may be filmed with a camera and the filmed video may be displayed in real time on the transparent display 16. The camera may be mounted near the rearview mirror or the bottom of the windshield. When video of the moving vehicle 10 is played back in real time, the movement of the moving vehicle 10 is synchronized with the video, which has the effect of suppressing motion sickness in passengers and guiding them to rest. The video of the moving vehicle 10 may be played back for a portion of the first period in which the resolution R gradually decreases.

[0085] Furthermore, during at least a portion of the period from time tB to time tBa, when the resolution R of the video content in the sleep phase decreases, the color of the outer edge 23 of the transparent display 16 may correspond to the color of the frame 21 surrounding the display area of ​​the transparent display 16. The outer edge 23 is outside the area enclosed by the dashed line of the transparent display 16 in Figure 3, and is also enclosed by the frame 21. The area enclosed by the dashed line of the transparent display 16 is the display area where the video content is actually displayed.

[0086] The video control unit 54, in accordance with the control signal from the control device 50, gradually brings the color of the outer edge 23 closer to the color of the frame 21 according to the elapsed time t from time tB. This makes it difficult for the passenger to perceive the boundary between the display area of ​​the transparent display 16 and the frame 21. As a result, the visual stimulus given to the passenger can be suppressed during the first period when the resolution R decreases. At this time, the color of the outer edge 23 may be adjusted by increasing the weighting of the frame 21's color as it approaches the frame 21, so that the color of the outer edge 23 of the display area gradually approaches the color of the frame 21.

[0087] Furthermore, the sound control unit 56 may gradually decrease the volume in accordance with the elapsed time t during the first period (from time tB to time tBa) in which the resolution R of the sleep phase decreases, in accordance with the control signal of the control device 50. Similarly, the lighting control unit 58 may gradually decrease the brightness of the lighting in accordance with the elapsed time t during the first period in which the resolution R of the sleep phase decreases, in accordance with the control signal of the control device 50. Similarly, the fragrance control unit 60 may gradually decrease the amount of fragrance diffused in accordance with the elapsed time t during the first period in which the resolution R of the sleep phase decreases, in accordance with the control signal of the control device 50.

[0088] Next, the specific form of content output during the awakening phase will be described. When the awakening phase begins, the video control unit 54 plays predefined video content to be used in the awakening phase from the transparent display 16. The video content used in the awakening phase should be video that provides the occupant with appropriate visual stimulation to induce awakening.

[0089] The colors displayed on the transparent display 16 during the awakening phase may be vivid. For example, bright warm colors such as red, orange, and yellow may be used. Using these colors tends to enhance the awakening effect. Also, high-contrast colors may be used during the awakening phase. For example, colors with a clear contrast between light and dark provide visual stimulation to the occupant and tend to enhance the awakening effect. Also, natural colors may be used during the awakening phase. For example, the blue of the bright sky in the early morning, the orange and red of the sunrise, and the green and blue that reflect the sunlight during the day may be used.

[0090] Furthermore, the subjects in the awakening phase may include active scenes such as running, cycling, dancing, and sports competitions. Alternatively, the subjects in the awakening phase may include the facial expressions and movements of active people. For example, a person's smile or the movements of a person exercising may be used. Additionally, the subjects in the awakening phase may include futuristic elements such as futuristic architecture, gadgets, and digital art. Furthermore, the subjects in the awakening phase may include sunrises, grasslands glistening with morning dew, mountains with the sun rising, a daytime blue sky and lush forests, and landscapes in full bloom.

[0091] Furthermore, the subject's movements during the awakening phase should be faster and more dynamic than those during the sleep phase. For example, the subject's movements during the awakening phase could be a vehicle moving at high speed, a runner running at high speed, or the movements of athletes participating in fast-paced sports. The subject's movements during the awakening phase could also be dynamic, such as jumps, spins, or acrobatic movements. The subject's movements during the awakening phase could also be rhythmic, such as dancing to music or rhythmic exercises. The subject's movements during the awakening phase could also be trees swaying in the wind, a flowing river, waves on the sea, or a flock of birds flying around.

[0092] In the awakening phase, dynamic and energetic compositions are desirable. For example, compositions that make extensive use of diagonal or oblique lines in the awakening phase should give the viewer a sense of visual movement. Compositions in the awakening phase can also be a combination of close-ups and wide shots. For example, a composition in the awakening phase could be a combination of a close-up focusing on the details of the subject and a wide shot that conveys a sense of breadth. Furthermore, compositions in the awakening phase can be multi-layered compositions that give visual depth, such as a foreground, middle ground, and background. Compositions in the awakening phase can also be expansive compositions that incorporate vast landscapes or distant views to convey a sense of spaciousness.

[0093] Dynamic camerawork is preferable during the awakening phase. For example, compositions during the awakening phase could include drone shots taken with a camera mounted on a drone, slider shots where the camera moves forward to approach the subject, or smooth movements using a gimbal. The camerawork during the awakening phase could also involve relatively fast panning and tilting. Such rapid camera movements can provide visual stimulation to the passenger. Furthermore, relatively abrupt zoom-in and zoom-out are also acceptable during the awakening phase, providing visual stimulation to the passenger. Additionally, panoramic shots capturing vast landscapes or footage using a wide-angle lens are also acceptable during the awakening phase.

[0094] While the above examples illustrate video content for the awakening phase, the system is not limited to the aforementioned video content; any video that provides appropriate visual stimulation to the occupant and guides them towards awakening is acceptable.

[0095] Furthermore, the sound control unit 56 may play audio content in accordance with the control signal of the control device 50 during the awakening phase, matching the audio content to the video content. For example, if the video content is running, the audio content may be the breathing of the runner during the run. Alternatively, the audio content may be different from the audio in the video. For example, the audio content may be rhythmic music that encourages the passenger to wake up.

[0096] Furthermore, the lighting control unit 58 may, in accordance with the control signal from the control device 50, illuminate each lighting device 20 with light corresponding to the color of the video content. At this time, as in the sleep phase, each lighting device 20 may illuminate with light corresponding to the color of the video content. In addition, to encourage the passenger to wake up, the lighting control unit 58 may illuminate each lighting device 20 with light of a different hue from the color of the video content.

[0097] Furthermore, for at least a portion of the awakening phase, the brightness Br of the video content may increase in accordance with the elapsed time t of the awakening phase. As shown in Figure 6, at time tC when the awakening phase begins, the brightness Br gradually increases from the minimum value Brmin with the elapsed time t. This causes the video in the awakening phase to gradually become brighter, and the occupant gradually awakens. Then, at time tD, a predetermined time has elapsed from time tC, if the brightness Br reaches the target brightness Br2 (maximum value), it may be maintained at the target brightness Br2 from time tD onward.

[0098] Here, the target brightness Br2 at time tD, when the brightness Br of the video content stops increasing during the awakening phase, may be higher than the predetermined value Br1 at time tB, when the brightness Br of the video content starts to decrease during the sleep phase. Similarly, the gradient (absolute value) of the change in brightness Br during the first period (from time tB to time tBa) when the brightness Br of the video content decreases during the sleep phase may be lower than the gradient (absolute value) of the change during the second period (from time tC to time tD) when the brightness Br of the video content increases during the awakening phase. As a result, the visual stimulus given to the passenger is reduced during the sleep phase, while the visual stimulus given to the passenger is greater during the awakening phase compared to the sleep phase. Consequently, the effect is obtained that the passenger will be more likely to fall asleep during the sleep phase, while the passenger will be more likely to wake up during the awakening phase. Furthermore, the average value of the brightness Br of the video content during the awakening phase may be higher than the average value of the brightness Br of the video content during the sleep phase. The above average values ​​correspond to the time average of brightness Br in each phase.

[0099] Furthermore, during at least a portion of the awakening phase, the resolution R of the video content may increase in proportion to the elapsed time t.

[0100] The increase in resolution R may be achieved by playing video content that is adjusted so that the resolution R gradually decreases. For example, video content used in the awakening phase, in which the resolution R gradually increases according to the elapsed time t, is pre-stored in the storage unit 70. The video control unit 54 can play the video content stored in the storage unit 70 to gradually increase the resolution R of the video content displayed on the transparent display 16 according to the elapsed time t.

[0101] As shown in Figure 7, at time tC when the awakening phase begins, the resolution R is set to the minimum value Rmin at the end of the sleep phase. After time tC, the resolution R increases according to the elapsed time t. At this time, the resolution R may increase linearly or curvilinearly, as shown in Figure 7. Furthermore, at time tD, after a predetermined time has elapsed from time tC, if the resolution R has risen to a predetermined target resolution R2 (maximum value), the increase in resolution R may be stopped and the resolution R may be maintained at the target resolution R2.

[0102] As shown in Figures 6 and 7, the brightness Br and resolution R in the awakening phase may increase in conjunction with each other.

[0103] Furthermore, the target resolution R2 at time tD, when the resolution R of the video content stops increasing during the awakening phase, may be higher than the predetermined resolution R1 at time tB, when the resolution R of the video content starts to decrease during the sleep phase. Also, the gradient of change (absolute value) during the first period (from time tB to time tC) in which the resolution R of the video content decreases during the sleep phase may be lower than the gradient of change (absolute value) during the second period (from time tC to time tD) in which the resolution R of the video content increases during the awakening phase. As a result, the visual stimulus given to the passenger is reduced during the sleep phase, while the visual stimulus given to the passenger is greater during the awakening phase compared to the sleep phase. Consequently, the passenger is more likely to fall asleep during the sleep phase, while they are more likely to wake up during the awakening phase. Note that time tB is an example of the first time point in this disclosure when the resolution starts to decrease, and time tD is an example of the second time point in this disclosure when the resolution stops increasing.

[0104] Figure 8 shows an example of video content displayed on the transparent display 16 during the deep breathing phase, sleep phase, and wakefulness phase. During the deep breathing phase, images A and B in Figure 8 are repeated alternately. That is, the object displayed in the center of the transparent display 16 expands and contracts at a speed synchronized with the rhythm of deep breathing.

[0105] When the user enters the sleep phase, an image of a moving vehicle, such as image C, is displayed. Furthermore, the image on the transparent display 16 changes from image C to image D and then to image E as time t elapses. Specifically, the brightness Br and resolution R of the video content decrease according to time t, causing the video content to gradually become darker and blurrier. Finally, the video content becomes a completely dark image, as shown in image E.

[0106] When the awakening phase begins, the image on the transparent display 16 changes in the order of image F to image J. Image F is the image at the start of the awakening phase (time tC), and is a completely dark image, the same as image E from the sleep phase. From image E onward, both brightness Br and resolution R increase according to the elapsed time t. For example, in the early stages of the awakening phase, both brightness Br and resolution R are low, as in image G, resulting in a blurry image with a strong impression of darkness. As time progresses, brightness Br and resolution R increase further, and the subject gradually becomes visible, as shown in image H. As more time passes, an image is displayed that allows the passenger to recognize the subject (e.g., trees), as shown in image I. Finally, when the brightness Br and resolution R of the awakening phase reach their respective target brightness Br2 and target resolution R2 (time tD), an image is displayed that allows the passenger to clearly recognize the subject, as shown in image J.

[0107] As shown in Figure 8, during the sleep phase, the resolution R gradually decreases, and the visual stimulation to the passenger gradually diminishes, reducing the visual burden on the passenger. This makes it easier for the passenger to relax and helps prevent motion sickness. During the wakefulness phase, the resolution R gradually increases, and the increased visual stimulation to the passenger promotes wakefulness. At this time, the smooth increase in resolution R suppresses the dramatic visual stimulation caused by abrupt changes in resolution R, allowing the passenger to wake up comfortably.

[0108] Figure 9 shows the relationship between spatial frequency f [Hz] and power [dB] (power spectrum) in images C, E, and J of Figure 8. Figure 9 is a graph obtained by applying a Fourier transform to each image (images C, E, and J) and calculating the power for each frequency in the spatial region within the image. The spatial frequency components in the spatial region are distributed in the range of -0.5 [Hz] to 0.5 [Hz] (in Figure 9, the range of -0.3 [Hz] to 0.3 [Hz] is shown).

[0109] The solid line at the top of Figure 9 represents the power of image J with respect to spatial frequency f, i.e., the power with respect to spatial frequency f at the point in the awakening phase when the resolution R reaches the target resolution R2 (time tD in Figure 7). In image J, because the resolution R is high, the power is dispersed over a wide range of spatial frequencies f.

[0110] The second solid line from the top in Figure 9 represents the power of image C with respect to spatial frequency f, i.e., the power with respect to spatial frequency f at the start of the sleep phase (time tB in Figure 7). Because image C, which corresponds to the start of the sleep phase, has a lower resolution R than image J, the power is concentrated in a lower frequency range compared to image J.

[0111] The dashed line at the bottom of Figure 9 represents the power of image E with respect to spatial frequency f, i.e., the power with respect to spatial frequency f when the resolution R decreases to its lowest value Rmin during the sleep phase (from time tBa to time tC in Figure 7). Because image E has a lower resolution R than image C, the power is concentrated in an even lower frequency range than image C.

[0112] As described above, in image J, which has a high resolution R, the power is distributed across a wide frequency range, resulting in stronger visual stimulation to the passenger and inducing wakefulness. In addition, image C at the start of the sleep phase has a low resolution R from the beginning, and the power is concentrated in a relatively low frequency range, resulting in less visual stimulation to the passenger. This makes it easier for the passenger to fall asleep. Furthermore, as the resolution R gradually decreases during the sleep phase, the power with respect to spatial frequency f transitions from the state of image C to the state of image E, and the power becomes even more concentrated in the low frequency range. This minimizes visual stimulation to the passenger, creating a state suitable for falling asleep.

[0113] Within a predetermined spatial frequency range, the power dispersion of image C may be greater than that of image E. The power dispersion of image J may be greater than that of image C. Furthermore, the power dispersion of image J may be greater than that of image E. The predetermined spatial frequency range may be between -1.0 Hz and 1.0 Hz, between -0.5 Hz and 0.5 Hz, or between -0.3 Hz and 0.3 Hz. The dispersion may be derived based on multiple power values ​​corresponding to each of the multiple spatial frequencies included in the predetermined spatial frequency range, and the average value of the multiple power values.

[0114] The following describes a comparison between changing the resolution R according to the elapsed time t during the sleep onset phase and the wakefulness phase, and not changing the resolution R.

[0115] Figure 10 shows the relationship between the resolution R when it is varied according to the elapsed time t (i.e., in this embodiment) and the resolution R when it is kept constant for each sleep-onset and wake-up phase. In Figure 10, the solid line corresponds to the case where the resolution R is varied (in this embodiment), and the dashed line corresponds to the case where the resolution R is kept constant.

[0116] The change in resolution R, shown by the solid line, is the same as in Figure 7 described above. Furthermore, when the resolution R, shown by the dashed line, is fixed, it is fixed at a predetermined minimum value during the sleep-onset phase and at a predetermined maximum value during the wake-up phase.

[0117] Figure 11 shows the experimental results evaluating the ease of falling asleep under two conditions: Condition 1, where the resolution R of the video content during the sleep-onset phase was kept constant, and Condition 2, where the resolution R of the video content was gradually decreased (i.e., this embodiment).

[0118] The vertical axis of Figure 11, representing ease of falling asleep, is the average value when multiple subjects were asked to rate their ease of falling asleep on a 9-point scale (from 0 to 8) after playing video content under conditions 1 and 2. A higher score indicates that the subject was able to fall asleep more comfortably.

[0119] As shown in Figure 11, under condition 1, where the resolution R was constant, the ease of falling asleep was 5.2 points. On the other hand, under condition 2, where the resolution R was gradually decreased during the sleep-onset phase, the ease of falling asleep was 5.6 points. From the above, it was found that gradually decreasing the resolution R during the sleep-onset phase makes it easier to fall asleep than when the resolution R is kept constant.

[0120] Figure 12 shows the experimental results evaluating the likelihood of waking up under two conditions: Condition 1, where the resolution R of the video content during the arousal phase was kept constant, and Condition 2 (this embodiment), where the resolution R of the video content was gradually increased.

[0121] The vertical axis of Figure 12, representing ease of waking, is the average value obtained when multiple subjects were asked to rate their perceived ease of falling asleep on a 9-point scale (from 0 to 8 points) after playing video content for both Condition 1 and Condition 2. A higher score indicates better wakefulness.

[0122] As shown in Figure 12, under condition 1, where the resolution R is constant, the likelihood of awakening was 4.8. On the other hand, under condition 2, where the resolution R increases, the likelihood of awakening was 6.0. From the above, it was found that gradually increasing the resolution R during the awakening phase makes awakening more likely than keeping the resolution R constant.

[0123] [Second Embodiment] Next, a second embodiment of the present disclosure will be described. In the first embodiment, the change in the resolution R of the video content was achieved by playing video content that had been adjusted in advance so that the resolution R would change. In the second embodiment, the control device 50 performs the change in the resolution R of the video content. That is, the control device 50 performs a process to change the resolution R of the video content according to the elapsed time t. The following describes specific control modes of the process by the control device 50 for decreasing the resolution R and the process for increasing the resolution R.

[0124] When the sleep phase begins, the control device 50 performs a smoothing process on the video content displayed on the transparent display 16, gradually reducing the resolution R. This smoothing process may, for example, use blur. Blur is a process that reduces the resolution R by dividing the video content into multiple blocks and replacing the color of the pixels within each block with the average value of the pixel colors within that block. In this case, the larger the block size, the greater the degree of blurring and the lower the resolution R.

[0125] When the sleep phase begins, the control device 50 gradually increases the size of the video content blocks set in Blur according to the elapsed time t, thereby gradually decreasing the resolution R. The video control unit 54, during the wakefulness phase, gradually increases the resolution R by gradually decreasing the size of the video content blocks in Blur according to the elapsed time t. After performing the smoothing process, the control device 50 instructs the video control unit 54 to output the smoothed video content to the transparent display 16 in real time.

[0126] In this way, by applying a smoothing process to the pre-set video content, the resolution R is adjusted in real time according to the elapsed time t. Furthermore, since the resolution R is changed by the processing of the control device 50, the amount of data stored in the storage unit 70 can be reduced compared to when playing video content with a pre-adjusted resolution R.

[0127] Figure 13 is a flowchart illustrating the control flow by the control device 50 that induces the passenger to fall asleep and wake up in the second embodiment. In the flowchart of Figure 13, steps S35 and S55, which controllably change the resolution R, are added compared to the flowchart shown in Figure 5.

[0128] When the deep breathing phase begins, the control device 50 outputs content that encourages deep breathing (step S10). Next, the control device 50 determines whether or not it is time to end the deep breathing phase (step S20). Specifically, the control device 50 determines the end timing of the deep breathing phase based on whether or not the elapsed time t since the start of the deep breathing phase has reached a preset first predetermined time. If the elapsed time t has not reached the first predetermined time (NO in step S20), the control device 50 continues to execute the deep breathing phase.

[0129] If the elapsed time t reaches a first predetermined time (YES in step S20), the control device 50 outputs content corresponding to the sleep phase (step S30). Next, the control device 50 performs a process to gradually reduce the resolution R of the video content over a predetermined period of time (step S35). Next, the control device 50 determines whether or not it is the end of the sleep phase (step S40). Specifically, the control device 50 determines the end of the sleep phase based on whether or not the elapsed time t since the start of the deep breathing phase has reached a preset second predetermined time. If the elapsed time t has not reached the second predetermined time (NO in step S40), the control device 50 continues to execute the sleep phase.

[0130] If the elapsed time t reaches a second predetermined time (YES in step S40), the control device 50 outputs content corresponding to the awakening phase (step S50). Next, the control device 50 performs a process to gradually increase the resolution R of the video content (step S55). Next, the control device 50 determines whether or not it is the end of the awakening phase (step S60). Specifically, the control device 50 determines the end of the awakening phase based on whether or not the elapsed time t since the start of the deep breathing phase has reached a preset third predetermined time. If the elapsed time t has not reached the third predetermined time (NO in step S60), the control device 50 continues to execute the awakening phase. If the elapsed time t reaches the third predetermined time (YES in step S60), the control device 50 terminates the awakening phase.

[0131] As described above, the first and second embodiments have been presented as examples of the technology of this disclosure. However, the technology in this disclosure is not limited thereto and can be applied to embodiments that have been modified, replaced, added, or omitted. Furthermore, it is possible to combine the components described in the above-mentioned embodiments to create new embodiments. Therefore, examples of modifications are given below.

[0132] [Modifications] In the above embodiment, an example was shown in which the space control system 100 is applied to the vehicle interior space 8, but this disclosure is not limited thereto. For example, the space control system may be applied to an office. Specifically, the space control system can be realized by using a display placed in the office as a display device. For example, during the lunch break, the resolution R of the video content displayed on the display may be changed, and in the sleep phase, for example, the resolution R of the video content on the display may be lowered to induce employees to fall asleep. Alternatively, before the end of the lunch break, the system may be switched to the wakefulness phase, and in the wakefulness phase, for example, the resolution R of the video content may be increased to induce employees to wake up.

[0133] Furthermore, the spatial control system may also be applied to a massage chair. Specifically, the spatial control system can be realized by using a display installed in the massage chair as a display device. For example, the sleep time is set from the input section of the massage chair. The control device installed in the massage chair sets the duration of the sleep onset phase and the wakefulness phase based on the set sleep time. Once the duration of the sleep onset phase and the wakefulness phase are set, the resolution R of the display and other parameters are adjusted as appropriate according to the elapsed time t of each phase.

[0134] Furthermore, the spatial control system may also be used in a home theater. In this case, the large display provided in the home theater can be used as a display device. Also, the speakers provided in the home theater can be used as an audio device.

[0135] In the above embodiment, the space control system included a fragrance generator 24, but this disclosure is not limited to an embodiment that includes a fragrance generator 24. That is, the fragrance generator 24 may be omitted.

[0136] In the second embodiment described above, Blur was used as an example of a smoothing process to change the resolution R, but this disclosure is not limited thereto. The smoothing process may use, for example, a Gaussian filter. In other words, the specific method is not particularly limited as long as it is a process that can change the resolution R by the control device 50.

[0137] In the above embodiment, the lower lighting device 20A, the side lighting device 20B, and the upper lighting device 20C were arranged to surround the transparent display 16, but at least one of these may be arranged. That is, the lighting device 20 may be arranged around at least a portion of the transparent display 16. Also, at least one of the first ceiling lighting device 20D and the second ceiling lighting device 20E may be omitted. Furthermore, since the lighting device 20 is not essential for the technology of this disclosure, it may be implemented with all lighting devices 20 omitted.

[0138] In the above embodiment, the sleep phase was a phase in which the user is guided to fall asleep; however, this disclosure is not limited to a mode in which the user is guided to fall asleep. That is, it may be a mode in which the user is guided to a relaxed rest. In this case, a rest phase in which the user is guided to rest is an example of the second phase of this disclosure.

[0139] In the above embodiment, the resolution R was reduced in proportion to the elapsed time t during the sleep onset phase from time tB to time tBa, but the resolution R may be reduced throughout the entire sleep onset phase.

[0140] In the above embodiment, the resolution R was increased in proportion to the elapsed time t during the awakening phase from time tC to time tD, but the resolution R may be increased throughout the entire awakening phase.

[0141] This disclosure is useful in the field of technology for guiding the user's state to an appropriate state in spaces such as inside a vehicle.

Claims

1. A spatial control system comprising a control device that controls the display of video content on a display device arranged within the space, wherein the resolution of the video content decreases in proportion to the elapsed time during at least a portion of the first phase in which the user is guided to rest.

2. The spatial control system according to claim 1, wherein the resolution of the video content increases in proportion to the elapsed time during at least a portion of the second phase in which the user is induced to awaken.

3. The spatial control system according to claim 2, wherein, in the first phase, the point in time when the resolution of the video content begins to decrease is defined as the first point in time, and in the second phase, the point in time when the resolution of the video content ends to increase is defined as the second point in time, the resolution at the second point in time is higher than the resolution at the first point in time.

4. The spatial control system according to claim 2, wherein the gradient of change during a first period in which the resolution of the video content decreases in the first phase is lower than the gradient of change during a second period in which the resolution of the video content increases in the second phase.

5. The spatial control system according to claim 1 or 2, wherein, for at least a portion of the time during which the resolution of the video content decreases, the color of the outer edge of the video content corresponds to the color of the frame surrounding the display area of ​​the display device.

6. The spatial control system according to claim 1 or 2, wherein the display device is positioned between the front and rear seats of a vehicle, and for at least a portion of the time during which the resolution of the video content decreases with time, the video content includes video moving in the same direction as the direction of travel of the vehicle.

7. The spatial control system according to claim 1 or 2, comprising an illumination device positioned in at least part of the periphery of the display device, wherein the control device illuminates the illumination device with light corresponding to the color of the video content.

8. The spatial control system according to claim 1 or 2, wherein the control device performs a process to change the resolution of the video content according to the elapsed time.

9. A spatial control method comprising a computer displaying video content on a display device, wherein, for at least a portion of the first phase in which the user is guided to rest, the resolution of the video content displayed on the display device decreases in proportion to the elapsed time.

10. A vehicle comprising a display device located inside the vehicle and a control device that controls the display of video content on the display device, wherein the resolution of the video content is reduced in proportion to the elapsed time for at least a portion of the first phase in which the user is guided to rest.

Images