System and mobile body

Abstract

A display system 1 comprises a video projection member 2 and a control device 7. The control device 7 causes the video projection member 2 to display video content for guiding a user to rest. The video content includes content in which first video corresponding to a green hue is displayed in a first period, content in which second video corresponding to a blue hue is displayed in a second period after the first period, and content in which third video is displayed in a third period after the second period. The brightness of the third video is lower than the brightness of the second video.

Description

Systems and Mobile Devices

[0001] The present disclosure relates to a technique for inducing a user to fall asleep.

[0002] Patent document 1 discloses that after performing lighting relaxation control to reduce the illuminance or color temperature in a private space and video relaxation control to output a first video with less visual stimulation, lighting awakening control to increase the illuminance or color temperature in the private space and awakening relaxation control to output a second video with more visual stimulation are performed.

[0003] Patent No. 7187943

[0004] Patent Document 1 merely discloses that by stimulating the user's visual sense, the user is guided into a relaxed state and then into an awake state, but does not take into consideration smoothly guiding the user into a sleep state after guiding the user into a relaxed state.

[0005] The present disclosure provides a technology for smoothly inducing a user into a sleep state after inducing the user into a relaxed state.

[0006] A system in one aspect of the present disclosure includes an image projection member and a control device, and the control device causes the image projection member to display image content that guides a user to rest, the image content including content in which a first image corresponding to a green hue is displayed during a first period, content in which a second image corresponding to a blue hue is displayed during a second period after the first period, and content in which a third image is displayed during a third period after the second period, and the brightness of the third image is lower than the brightness of the second image.

[0007] According to this configuration, the user can be guided into a relaxed state and then smoothly guided into a sleep state.

[0008] 1 is a diagram showing an example of a top view of a vehicle equipped with a display system; FIG. 2 is a diagram showing an example of a side view of a vehicle; FIG. 3 is a block diagram showing an example of the electrical configuration of a display system; FIG. 4 is a flowchart showing an example of content output processing in the display system; FIG. 5 is a diagram showing an example of video content display in a first period; FIG. 6 is a diagram showing an example of video content display in a second period; FIG. 7 is a diagram showing an example of video content display in a third period; FIG. 8 is a diagram showing an example of experimental results; FIG. 9 is a diagram showing an example of audio content data; FIG. 10 is a flowchart showing another example of content output processing in the display system; FIG. 11 is a diagram showing an example of fluctuation in brightness of illumination light from the first period to the third period; FIG. 12 is a diagram showing another example of fluctuation in brightness of illumination light from the first period to the third period.

[0009] (Findings underlying the present disclosure) Research is being conducted into technologies that allow users to sleep comfortably by smoothly inducing them to fall asleep. Whether or not a user can be smoothly induced to fall asleep depends on the user's psychological state when the induction to fall asleep begins. For example, if a user is in an excited state or a highly awake state, it is difficult to smoothly induce the user to fall asleep even if the space is darkened.

[0010] Therefore, the inventors have discovered that if the user is gradually guided into a relaxed state and then guided into a sleep state, the user can be smoothly guided into a sleep state regardless of the user's psychological state at the time the guidance into the sleep state begins.

[0011] Specifically, the inventors first applied a stimulus corresponding to a green hue, which has the effect of easing and stabilizing a state of tension, to the user's visual field, followed by a stimulus corresponding to a blue hue, which has a calming effect. In this case, the inventors discovered that after the user's state of tension is alleviated and their psychological state is stabilized, the user's psychological state is calmed, effectively inducing the user to a relaxed state. They then discovered that by reducing the stimulus applied to the user's visual field after the user has transitioned to a relaxed state, the user can be smoothly induced to fall asleep. Based on the above findings, the inventors have arrived at the various aspects of the present disclosure.

[0012] (1) A system according to one aspect of the present disclosure includes an image projection component and a control device, and the control device causes the image projection component to display image content that guides a user to rest. The image content includes content in which a first image corresponding to a green hue is displayed during a first period, content in which a second image corresponding to a blue hue is displayed during a second period after the first period, and content in which a third image is displayed during a third period after the second period, and the brightness of the third image is lower than the brightness of the second image.

[0013] In this configuration, video content guiding the user to rest is displayed on the video projection component. As a result, the hue of the video displayed on the video projection component changes from green, which has the effect of easing the user's tension and stabilizing the user's psychological state, to blue, which has the effect of calming the user's psychological state, and then the brightness of the video displayed on the video projection component is reduced. This reduces the tension of the user viewing the video displayed on the video projection component, stabilizing the user's psychological state, and then calming the user's psychological state, effectively guiding the user to a relaxed state. Then, in this configuration, the brightness of the video displayed on the video projection component is reduced, reducing the visual stimulation provided to the relaxed user and smoothly guiding the user to a sleep-inducing state.

[0014] (2) In the system described in (1) above, the first image may be an image in which, when viewed over time, the area of ​​a green hue is larger than the area of ​​hues other than the green hue.

[0015] According to this configuration, an image in which the area of ​​green hues is larger than the area of ​​hues other than green hues when viewed on a time average, such as an image taken of a forest or a lush green river during the day, can be used as the first image.

[0016] (3) In the system described in (1) above, the second image may be an image in which, when viewed on a time average, the area of ​​the blue hue is larger than the area of ​​hues other than the blue hue.

[0017] According to this configuration, for example, an image such as an image of a forest taken at night, in which the area of ​​blue hue is larger than the area of ​​hues other than blue hue when viewed on a time average, can be used as the second image.

[0018] (4) In the system described in (1) above, the system may further include a lighting device arranged on a surface parallel to the display surface of the video content on the video projection component, and the control device may cause the lighting device to emit illumination light corresponding to a green hue during the first period.

[0019] In this configuration, during the first period, illumination light corresponding to the same hue as the first video is turned on, thereby improving the effect of alleviating tension in the user by displaying the first video and stabilizing the user's psychological state.

[0020] (5) The system described in (1) above may further include a lighting device arranged on a surface parallel to the display surface of the video content on the video projection component, and the control device may cause the lighting device to emit illumination light corresponding to a blue hue during the second period.

[0021] In this configuration, during the second period, illumination light corresponding to the same hue as the second video is turned on, thereby improving the effect of calming the user's psychological state by displaying the second video.

[0022] (6) In the system described in (1) above, the third video may be a video in which, on a time average, the blacked-out area is larger than the non-blacked-out area.

[0023] According to this configuration, an image in which the blacked-out area is larger than the non-blacked-out area when viewed on a time average, such as an image of a signal waveform with a black image as the background, can be adopted as the third image.

[0024] (7) In the system described in (1) above, the control device may control the operation of at least one of a plurality of devices that, in addition to displaying the video content, performs an operation that stimulates one of the five senses of a user viewing the video content.

[0025] According to this configuration, it is possible to stimulate the five senses of a user viewing video content, thereby helping the user transition to a psychological state that corresponds to the video content.

[0026] (8) In the system described in (7) above, the plurality of devices may include an acoustic device and a diffuser.

[0027] According to this configuration, the auditory and olfactory senses of the user viewing the video content are stimulated, thereby helping the user transition to a psychological state that corresponds to the video content.

[0028] (9) In another aspect of the present disclosure, a system includes a lighting device and a control device, wherein the control device causes the lighting device to turn on a first illumination light corresponding to a green hue during a first period, turn on a second illumination light corresponding to a blue hue during a second period after the first period, and turn on a third illumination light during a third period after the second period, wherein the brightness of the third illumination light is lower than the brightness of the second illumination light.

[0029] In this configuration, the hue of the illumination light emitted by the lighting device changes from green, which has the effect of alleviating tension and stabilizing the user's psychological state, to blue, which has the effect of calming the user's psychological state, and then the brightness of the illumination light is reduced. This reduces the tension of the user viewing the illumination light, stabilizes the user's psychological state, and then calms the user's psychological state, effectively guiding the user into a relaxed state. Since the brightness of the illumination light is then reduced, the visual stimulation of the relaxed user is reduced, allowing the user to smoothly fall asleep.

[0030] (10) In another aspect of the present disclosure, a moving body includes an image projection member and a control device, and the control device causes the image projection member to display image content, the image content including content in which a first image corresponding to a green hue is displayed during a first period, content in which a second image corresponding to a blue hue is displayed during a second period after the first period, and content in which a third image is displayed during a third period after the second period, and the brightness of the third image is lower than the brightness of the second image.

[0031] According to this configuration, the same effects as those of the system described in (1) above can be obtained.

[0032] (11) The system described in (1) or (9) above may further include a lighting device, and the control device may cause the lighting device to turn on illumination light during the first period, the second period, and the third period, periodically vary the brightness of the illumination light over time during the first period and the second period, and increase the period of variation in the brightness of the illumination light at the start of the third period.

[0033] According to this configuration, the periodic fluctuation of the brightness of the illumination light during the first period, the second period, and the third period can provide periodic stimulation to the visual sense of the user viewing the first image, the second image, and the third image. This can promote the relaxation of the user's state of tension by displaying the first image, and improve the effect of stabilizing the user's psychological state. This can improve the effect of calming the user's psychological state by displaying the second image, and effectively guiding the user into a relaxed state. In the third period, the period of the fluctuation of the brightness of the illumination light is longer, reducing the opportunity for periodic stimulation to be provided to the visual sense of a user in a relaxed state, and can smoothly guide the user into a sleep-inducing state.

[0034] (12) The system described in (1) or (9) above may further include a fragrance release device, and the control device may control the fragrance release device to release a fragrance that induces the user into a relaxed state during the first period and the second period, and stop the release of the fragrance at the start of the third period.

[0035] According to this configuration, the release of a fragrance that induces the user to a relaxed state during the first and second periods can stimulate the olfactory sense of the user viewing the first and second images to induce the user to a relaxed state. This can improve the effect of promoting the relaxation of the user's state of tension and stabilizing the user's psychological state, which is achieved by displaying the first image. This can improve the effect of calming the user's psychological state and effectively inducing the user to a relaxed state, which is achieved by displaying the second image. Since the release of the fragrance is stopped during the third period, the olfactory sense of the user in a relaxed state is not stimulated, allowing the user to smoothly enter a sleep state.

[0036] (13) The system described in (1) or (9) above may further include an acoustic device, and the control device may control the acoustic device during the first period to output bird sounds whose peak frequency components are equal to or greater than a predetermined reference frequency, and may control the acoustic device during the second period to output bird sounds whose peak frequency components are less than the reference frequency.

[0037] According to this configuration, by outputting the sound of a bird, such as a small bird, whose peak frequency component is equal to or greater than a predetermined reference frequency during the first period, the auditory sense of the user viewing the first video can be stimulated to induce the user into a relaxed and alert state. This can promote the alleviation of tension in the user caused by the display of the first video and improve the effect of stabilizing the user's psychological state. By outputting the sound of a bird, such as an owl, whose peak frequency component is less than the reference frequency during the second period, the auditory sense of the user viewing the second video can be stimulated to suppress the user's alert state and make the user aware that day has turned into night. This can improve the effect of calming the user's psychological state and effectively guiding the user into a relaxed state caused by the display of the second video.

[0038] Note that the embodiments described below each represent a specific example of the present disclosure. The numerical values, shapes, components, steps, order of steps, etc. shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Among the components in the following embodiments, components that are not described in the independent claims that represent the highest concept are described as optional components. In all embodiments, the respective contents can also be combined.

[0039] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0040] (Embodiment 1) FIG. 1 is a diagram showing an example of a top view of a vehicle 9 equipped with a display system 1. In the following description, as shown in the lower right of FIG. 1 , the traveling direction of the vehicle 9 is referred to as the fore-and-aft direction or Y direction, the direction in which the vehicle 9 moves forward is referred to as the forward or +Y direction, and the direction in which the vehicle 9 moves backward is referred to as the backward or −Y direction. The direction perpendicular to the ground on which the vehicle 9 is traveling is referred to as the up-and-down direction or Z direction, the direction from the vehicle 9 toward the ground on which the vehicle 9 is traveling in the up-and-down direction is referred to as the downward or −Z direction, and the direction opposite to the downward and −Z directions is referred to as the upward or +Z direction. The direction perpendicular to the fore-and-aft direction (Y direction) and the up-and-down direction (Z direction) is referred to as the left-and-right direction or X direction. In the left-and-right direction and X direction, the direction toward the right as the vehicle 9 moves forward is referred to as the right or +X direction, and the direction toward the left as the vehicle 9 moves forward is referred to as the left or −X direction.

[0041] As shown in Fig. 1 , the display system 1 (system) is disposed between a front seat 91 and a rear seat 92 of a vehicle 9 (mobile body), such as a passenger car, bus, or taxi. Specifically, the display system 1 includes a transparent display 2 (image projection member), a lighting device 5 (Fig. 2) described below, and a frame 99 (Fig. 2) that supports these and is also described below. Hereinafter, the interior space of the vehicle 9, in which the rear seat 92 located behind the front seat 91 (in the -Y direction) is disposed, will be referred to as the vehicle interior 90. In other words, the display system 1 is disposed within the vehicle interior 90.

[0042] The front seats 91 include a driver's seat, and the rear seats 92 do not include a driver's seat. For example, if the vehicle 9 is a so-called three-row seat vehicle and the first row of seats includes a driver's seat and a passenger seat, the seats included in the second and third row of seats may be the rear seats 92, and the driver's seat and passenger seat included in the first row of seats may be the front seats 91. Alternatively, the seats included in the third row of seats may be the rear seats 92, and the driver's seat and passenger seat included in the first row of seats and the seats included in the second row of seats may be the front seats 91.

[0043] 2 is a diagram showing an example of a side view of the vehicle 9. As shown in Fig. 2, the transparent display 2 is a plate-shaped transparent member, and has a transparent rectangular display surface 21 that displays video content toward the rear seat 92, i.e., in the -Y direction, and a transparent rectangular back surface 22 on the opposite side to the display surface 21.

[0044] The transparent display 2 is supported by a frame 99 at a position between the rear seat 92 and the front seat 91 of the vehicle 9, with its longitudinal direction aligned with the X direction, so that the display surface 21 overlaps with the view in the direction of travel of the vehicle 9 (Y direction) when viewed from the rear seat 92. The transparent display 2 displays video content on the display surface 21 under the control of a control circuit 7 ( FIG. 3 ), which will be described later. The transparent display 2 is formed, for example, by a transparent organic EL display. The transparent display 2 has a constant light transmittance of 80% or more, 90% or more, or 100%.

[0045] A transparent light-controlling film (light-controlling sheet) may be provided over the back surface 22 of the transparent display 2, adjusting the light transmittance of the back surface 22 under the control of a control circuit 7 (FIG. 7) described later. A projector may be provided at the rear upper portion of the rear seat 92 of the vehicle 9, and the transparent display 2 may be configured as a translucent screen (image projection member). In this way, under the control of a control circuit 7 (FIG. 3) described later, the projector may project video content onto the display surface 21 of the screen, thereby displaying the video content on the display surface 21. The light transmittance of the screen may be adjustable under the control of the control circuit 7 (FIG. 3) described later.

[0046] The lighting device 5 includes, for example, a plurality of RGBW-type LED (Light Emitting Diode) elements that emit blue, green, red, and white light, and has a tape-like configuration with the plurality of LED elements arranged in a row. The lighting device 5 is disposed parallel to the lower end of the display surface 21 on a surface 991 of the frame 99 facing the rear seat 92, which is parallel to the display surface 21. The frame 99 may include a first surface parallel to the display surface 21 and a second surface parallel to the display surface 21 and facing the first surface. The distance between the first surface and the rear seat 92 may be smaller than the distance between the second surface and the rear seat 92, and the first surface may be the surface 991.

[0047] The lighting device 5 is not limited to an RGBW type LED element, but may be configured with, for example, an RGB type LED element that emits blue light, green light, and red light, or may be configured with an LED element that emits blue light and white light. The lighting device 5 is not limited to an LED element, but may be configured with one or more elements that can emit colored light. The lighting device 5 is not limited to being positioned parallel to the display surface 21, but may also be placed on the ceiling or sidewall of the vehicle interior 90, etc. Multiple lighting devices 5 may be placed in the vehicle interior 90.

[0048] The frame 99 supports the lower end of the transparent display 2 with a support member extending in the vertical direction (Z direction). The frame 99 may support either one end of the transparent display 2 in the horizontal direction (X direction) with a support member extending in the vertical direction (Z direction). The frame 99 may support both ends of the transparent display 2 in the horizontal direction (X direction) with a pair of support members extending in the vertical direction (Z direction).

[0049] Next, a description will be given of the electrical configuration of the display system 1. Fig. 3 is a block diagram showing an example of the electrical configuration of the display system 1. The display system 1 includes the transparent display 2, the acoustic device 4, the lighting device 5, a diffuser 6 (fragrance release device), a memory unit 8, a control circuit 7 (control device), a video control unit 20, an acoustic control unit 40, a lighting control unit 50, and a scent control unit 60.

[0050] The transparent display 2, the audio device 4, the lighting device 5, and the diffuser 6 are arranged in the vehicle cabin 90. These devices operate to stimulate one of the five senses of an occupant (hereinafter, referred to as a user) in the vehicle cabin 90. The five senses are sight, hearing, touch, taste, and smell.

[0051] The transparent display 2 displays video content to stimulate the user's vision. The audio device 4 is, for example, a speaker, and plays audio content to stimulate the user's hearing. The lighting device 5 turns on illumination light to stimulate the user's vision. The diffuser 6 is, for example, an aroma diffuser, and diffuses a scent into the vehicle interior 90 to stimulate the user's sense of smell.

[0052] The storage unit 8 is configured as a non-volatile rewritable storage device such as a hard disk drive or a solid state drive.

[0053] The storage unit 8 pre-stores data of video content to be displayed on the display surface 21. The video content is video content that guides the user to rest, and includes video content in which a first image corresponding to a green hue is displayed in an initial first period, video content in which a second image corresponding to a blue hue is displayed in a second period after the first period, and video content in which a third image having a lower brightness than the second image is displayed in a third period after the second period. Note that the storage unit 8 may store data of the video content to be displayed in the first, second, and third periods without dividing the data into periods, or may store the data by dividing the data into periods.

[0054] Here, rest refers to stopping activity and relaxing to rest the mind and body. The video content that induces the user to rest may be video content that induces the user to a relaxed state, or may be video content that relieves the user's stress. The video content that induces the user to rest may be video content that induces the user to fall asleep. The video content that induces the user to rest may be video content that refreshes the user's mind, video content that stabilizes the user's mind, or video content that induces the user to a state of mindfulness.

[0055] A first video corresponding to a green hue is a video in which, when viewed on a time average, the area of ​​the green hue is larger than the area of ​​hues other than the green hue. The area of ​​a certain hue when viewed on a time average of a certain video indicates the average number of pixels of that hue contained in each still image when multiple still images are extracted from the video in a predetermined time interval. In other words, when multiple still images are extracted from the first video in a predetermined time interval, the average number of pixels of the green hue contained in each still image is larger than the average number of pixels of hues other than the green hue contained in each still image.

[0056] Here, the green hue is a hue included in the chromaticity of "green" or "yellow-green" defined in JIS Z 8701. The green hue is known to have the effect of easing tension in a person who views an image of that hue and stabilizing the psychological state of that person. The first image may be, for example, an image of a daytime forest or a lush green river, or an abstract image of a daytime forest or a lush green river.

[0057] The second video corresponding to the blue hue is a video in which, on a time average, the area of ​​the blue hue is larger than the area of ​​hues other than the blue hue. In other words, when a plurality of still images are extracted from the second video in a predetermined time unit, the average number of pixels of the blue hue contained in each still image is larger than the average number of pixels of hues other than the blue hue contained in each still image.

[0058] Here, the blue hue refers to a hue included in the chromaticity of "blue," "blue-green," or "blue-purple" defined in JIS Z 8701. The blue hue is known to have a calming effect on the psychological state of a person who views an image of that hue. The second image may be, for example, an image of a forest at night or an abstract image of a forest at night.

[0059] The third image is an image that is lower in brightness than the second image and provides less visual stimulation to the user than the second image. The third image may be, for example, an image in which, when viewed on a time average, the blacked-out area is larger than the non-blacked area, such as a signal waveform with a black image as the background. The blacked-out area refers to the area that is perceived as black by the user. In other words, when multiple still images are extracted from the third image in a predetermined time interval, the average number of blacked-out pixels contained in each still image is greater than the average number of non-blacked pixels contained in each still image.

[0060] The storage unit 8 also stores in advance information indicating the end timings of the first, second, and third periods (hereinafter, end timing information). The end timings of the first, second, and third periods may be, for example, the elapsed time from the time when the video content of the first period is displayed on the display surface 21. However, the end timings of the first, second, and third periods may be, for example, the time elapsed since the video content of the first period is displayed on the display surface 21. However, the end timings of the first, second, and third periods may be, for example, the time of day.

[0061] The storage unit 8 may be configured to store in advance information indicating the start timings of the first, second, and third periods (hereinafter, start timing information) in the same manner as the end timing information. The storage unit 8 may be configured to store in advance the start timing information without storing in advance the end timing information.

[0062] The storage unit 8 also stores in advance data of audio content to be played by the audio device 4. The audio content includes audio content to be played in the first period, audio content to be played in the second period, and audio content to be played in the third period. The storage unit 8 may store the audio content data without dividing it into periods, or may store it by dividing it into periods.

[0063] The audio content to be played during the first period may be audio content that relieves the user's tension and induces the user into a stable psychological state (hereinafter, referred to as a neutral state). Specifically, the audio content to be played during the first period may be audio content such as sounds recorded in a forest and / or abstract music, including sounds of birds (e.g., small birds) whose peak frequency components are equal to or greater than a predetermined reference frequency (e.g., 1 kHz).

[0064] The audio content played during the second period may be audio content that induces the user into a calm psychological state (hereinafter referred to as a relaxed state). Specifically, the audio content played during the second period may be audio content such as sounds recorded in a forest at night, including the sounds of birds (e.g., owls) whose peak frequency is less than the reference frequency (e.g., 1 kHz). The reference frequency may be 0.9 kHz or 1.1 kHz. The reference frequency may be any frequency within the range of 0.9 kHz to 1.1 kHz.

[0065] FIG. 9 is a diagram showing an example of frequency characteristics of sounds represented by audio content. The horizontal axis of FIG. 9 represents frequency components. The vertical axis of FIG. 9 represents the volume level of each frequency component. For example, assume that the reference frequency is set to 1 kHz. FIG. 9 shows frequency characteristics G1 of sounds recorded in a forest, including a bird's voice band M1, and frequency characteristics G2 of sounds recorded in a forest at night, including an owl's voice band M2. The bird's voice band M1 is a frequency band whose peak is a frequency component F1 equal to or greater than the reference frequency of 1 kHz. The owl's voice band M2 is a frequency band whose peak is a frequency component F2 less than the reference frequency of 1 kHz. In this case, sounds recorded in a forest having frequency characteristics G1 can be used as the audio content to be played during the first period. Sounds recorded in a forest at night having frequency characteristics G2 can be used as the audio content to be played during the second period.

[0066] The sound content to be played during the third period may be sound content that induces the user to fall asleep, such as the sound of waves and / or birdsong.

[0067] The control circuit 7 includes a central processing unit (CPU) (not shown) and memories (not shown) such as ROM and RAM. The control circuit 7 may be an ECU (Electronic Control Unit) that is standard equipment on the vehicle 9, or may be configured separately from the ECU. The control circuit 7 is connected to the memory unit 8, the video control unit 20, the audio control unit 40, the lighting control unit 50, and the fragrance control unit 60 so as to be able to communicate with them.

[0068] The control circuit 7 refers to the timing information stored in the memory unit 8 and controls the operation of the transparent display 2, the acoustic device 4, the lighting device 5 and the diffuser 6 so as to guide the user to a state corresponding to each of the first, second and third periods.

[0069] Specifically, the control circuit 7 controls the operation of the transparent display 2, the audio device 4, the lighting device 5, and the diffuser 6 by outputting control signals to the video control unit 20, the audio control unit 40, the lighting control unit 50, and the scent control unit 60.

[0070] The video control unit 20 is configured with a drive circuit that drives the transparent display 2, and controls the operation of the transparent display 2 in accordance with a control signal from the control circuit 7. This control signal includes data of the video content to be displayed on the display surface 21 of the transparent display 2.

[0071] The audio control unit 40 is composed of a drive circuit (e.g., an amplifier) ​​that drives the audio device 4, and controls the operation of the audio device 4 in accordance with a control signal from the control circuit 7. This control signal includes data on the audio content to be played by the audio device 4. The audio device 4 may further include a vibration device that generates vibrations. In addition, the audio control unit 40 may vibrate the vibration device in conjunction with the audio content to be played by the audio device 4.

[0072] The lighting control unit 50 is composed of a drive circuit that drives the lighting device 5, and controls the operation of the lighting device 5 in accordance with a control signal from the control circuit 7. This control signal includes information indicating the color and / or brightness of the illumination light to be emitted by the lighting device 5. The color of the illumination light is specified, for example, by the hue value, lightness value, and saturation value of the illumination light, or the RGBW values ​​corresponding to these. The brightness of the illumination light is specified, for example, as a ratio (for example, 90%) of the brightness of the brightest illumination light that the lighting device 5 can emit (dimming rate 100%).

[0073] The scent control unit 60 is composed of a drive circuit that drives the diffuser 6, and controls the operation of the diffuser 6 according to a control signal from the control circuit 7. This control signal includes information indicating the type of scent to be diffused into the vehicle interior 90 by the diffuser 6. The types of scent include, for example, forest scents and citrus scents.

[0074] The following describes the content output process executed in the display system 1. This description also details the control of the operation of each device by the control circuit 7. Note that in the following description, it is assumed that the storage unit 8 stores video content and audio content data without classifying them by period.

[0075] Fig. 4 is a flowchart showing an example of content output processing in the display system 1. When the control circuit 7 receives a control signal indicating an instruction to start content output processing from the ECU, it starts the content output processing shown in Fig. 4. This control signal is input to the ECU by a user operating a mobile terminal such as a tablet terminal or an operating device mounted on the vehicle 9. When the control circuit 7 starts the content output processing, it reads out data and timing information of the video content and audio content from the storage unit 8.

[0076] (Step S1) In step S1, the control circuit 7 controls the operation of the transparent display 2, the sound device 4, the lighting device 5, and the diffuser 6 to output content for the first period in order to ease the user's tension and guide the user to a neutral state during the first period.

[0077] Specifically, the control circuit 7 outputs a control signal including the data of the video content read from the storage unit 8 to the video control unit 20. The video control unit 20 acquires the data of the video content from the control signal and displays the video content on the display surface 21 of the transparent display 2. As a result, the video content of the initial first period is displayed on the display surface 21.

[0078] Fig. 5 is a diagram showing an example of display of video content for a first period. As shown in Fig. 5, display surface 21 is provided with video display area 211 for displaying video content and information display area 212 for displaying information related to the video content. Fig. 5 shows an example in which, in step S1, first video 81 is displayed in video display area 211 as video content for the first period, when a video captured in daytime in a forest with spring water flowing into a river is used as first video 81.

[0079] 5, for ease of explanation, the area of ​​the green hue in the first image 81 is shaded in a grid pattern. In other words, as shown in FIG. 5, the area of ​​the green hue in the first image 81 is larger than the area of ​​hues other than the green hue. In this way, stimulating the user's vision with the first image 81 corresponding to the green hue can ease the user's tension and induce the user to a neutral state.

[0080] The control circuit 7 outputs a control signal including the data of the audio content read from the storage unit 8 to the audio control unit 40. The audio control unit 40 acquires the data of the audio content from the control signal and causes the audio device 4 to play the audio content. This causes the audio content of the initial first period to be played.

[0081] In this way, stimulating the user's hearing with the audio content played during the first period, which relieves the user's state of tension and induces the user into a neutral state, can help the user transition to a neutral state.

[0082] The control circuit 7 outputs a control signal including information indicating illumination light corresponding to a green hue to the illumination control unit 50. Illumination light corresponding to a green hue is, for example, illumination light whose hue is the average value of the RGBW values ​​of multiple pixels constituting the first image 81 corresponding to the green hue. The illumination light corresponding to the green hue is not limited to this, and may also be a predetermined RGBW value (fixed value) corresponding to the chromaticity of "green" or "yellow-green" defined in JIS Z 8701. The illumination control unit 50 causes the illumination device 5 to emit illumination light corresponding to the green hue indicated by the control signal. In this way, stimulating the user's vision with illumination light corresponding to a green hue can also alleviate the user's tension and induce the user to a neutral state.

[0083] The control circuit 7 may include information indicating illumination light corresponding to a green hue and may further output a control signal to the illumination control unit 50 instructing the illumination control unit 50 to fluctuate the hue or brightness of the illumination light. The illumination control unit 50 may then drive the illumination device 5 in accordance with the control signal to fluctuate the hue or brightness of the illumination light corresponding to the green hue that the illumination device 5 emits. In this case, the stimulation provided to the user's vision fluctuates, providing the user with a sense of security. This allows the user's psychological state to smoothly transition to a neutral state.

[0084] Fluctuations in the hue of illumination light corresponding to the green hue can be achieved, for example, by varying the RB value of the RGBW value of the illumination light by a predetermined amount at a predetermined cycle. Fluctuations in the brightness of illumination light can be achieved, for example, by varying the brightness of the illumination light by a predetermined amount at a predetermined cycle. However, the method for achieving fluctuations in the hue and brightness of illumination light is not limited to this.

[0085] The control circuit 7 outputs a control signal including information indicating the type of scent that will alleviate the user's state of tension and induce the user to a neutral state to the scent control unit 60. The type of scent that will alleviate the user's state of tension and induce the user to a neutral state is predetermined, for example, a forest scent. The scent control unit 60 causes the diffuser 6 to diffuse the type of scent indicated by the control signal into the vehicle interior 90.

[0086] In this way, stimulating the user's sense of smell with a scent that relieves the user's state of tension and induces the user to a neutral state can help the user transition to a neutral state.

[0087] Note that the control circuit 7 may control the operation of the transparent display 2 during the first period, and may not control the operation of at least one device selected from the group consisting of the acoustic device 4, the lighting device 5, and the diffuser 6. Alternatively, the control circuit 7 may control the operation of the lighting device 5 during the first period, and may not control the operation of at least one device selected from the group consisting of the transparent display 2, the acoustic device 4, and the diffuser 6.

[0088] (Step S2) In the next step S2, the control circuit 7 refers to the timing information and determines whether or not the end timing of the first period has arrived. The control circuit 7 waits until it determines that the end timing of the first period has arrived (NO in step S2), and when it determines that the end timing of the first period has arrived (YES in step S2), it executes step S3.

[0089] (Step S3) In step S3, the control circuit 7 controls the operation of the lighting device 5 to output content according to the second time period, in the same manner as in step S1, in order to induce the user into a relaxed state.

[0090] In step S3, the control circuit 7 does not control the operations of the transparent display 2 and the audio device 4. However, in step S1, display of video content including video content for the first period, the second period, and the third period on the display surface 21 has started, and playback of audio content including audio content for the first period, the second period, and the third period has started. Therefore, after it is determined in step S2 that the first period has ended, when step S3 is executed, the video content for the second period following the first period is displayed on the display surface 21, and the audio content for the second period is played back by the audio device 4.

[0091] 6 is a diagram showing an example of display of video content for the second period. In this example, when a video of a forest captured at night is used as the second video 82, the second video 82 is displayed in the video display area 211 as the video content for the second period in step S3.

[0092] 6, for ease of explanation, the area of ​​the blue hue in the second image 82 is shaded in a grid pattern. In other words, as shown in FIG. 6, the area of ​​the blue hue in the second image 82 is larger than the area of ​​hues other than blue. In this way, stimulating the user's visual sense with the second image 82 corresponding to the blue hue can calm the user's mental state, which is neutral, and induce the user to a relaxed state.

[0093] By playing the audio content of the second period by the audio device 4, the user's hearing is stimulated by the audio content of the second period that induces the user into a relaxed state, thereby helping the user to transition into a relaxed state.

[0094] In step S3, the control circuit 7 outputs a control signal including information indicating illumination light corresponding to a blue hue to the illumination control unit 50. Illumination light corresponding to a blue hue is, for example, illumination light whose hue is the average value of the RGBW values ​​of multiple pixels constituting the second image 82 corresponding to the blue hue. Illumination light corresponding to a blue hue is not limited to this, and may also be a predetermined RGBW value (fixed value) corresponding to the chromaticity of "blue," "blue-green," or "blue-purple" defined in JIS Z 8701. The illumination control unit 50 causes the illumination device 5 to emit illumination light corresponding to the blue hue indicated by the control signal. In this way, stimulating the user's vision with illumination light corresponding to a blue hue can also induce the user to enter a relaxed state.

[0095] As in step S1, the control circuit 7 may include information indicating illumination light corresponding to a blue hue and may further output a control signal to the illumination control unit 50 that instructs the illumination control unit 50 to fluctuate the color tone or brightness of the illumination light. Fluctuation in the color tone of illumination light corresponding to a blue hue can be achieved, for example, by varying the RG value among the RGBW values ​​of the illumination light by a predetermined amount at a predetermined cycle.

[0096] As a result, the lighting control unit 50 may drive the lighting device 5 in accordance with the control signal to fluctuate the color or brightness of the illumination light corresponding to the blue hue that the lighting device 5 emits. In this case, the stimulation given to the user's vision fluctuates, which can give the user a sense of security. This allows the user to smoothly transition to a relaxed state.

[0097] Note that the control circuit 7 may control the operation of the transparent display 2 during the second period, and may not control the operation of at least one device selected from the group consisting of the audio device 4 and the lighting device 5. Alternatively, the control circuit 7 may control the operation of the lighting device 5 during the second period, and may not control the operation of at least one device selected from the group consisting of the transparent display 2 and the audio device 4.

[0098] In this embodiment, in step S3, the control circuit 7 does not control the scent control unit 60. However, as in step S1, the type of scent that will induce the user to a relaxed state may be determined in advance, and in step S3, the control circuit 7 may output a control signal including information indicating the type of scent that will induce the user to a relaxed state to the scent control unit 60. This may cause the scent control unit 60 to diffuse the type of scent indicated by the control signal into the vehicle interior 90 using the diffuser 6.

[0099] (Step S4) In the next step S4, the control circuit 7 refers to the timing information and determines whether or not the end timing of the second period has arrived. The control circuit 7 waits until it determines that the end timing of the second period has arrived (NO in step S4), and when it determines that the end timing of the second period has arrived (YES in step S4), it executes step S5.

[0100] (Step S5) In step S5, the control circuit 7 controls the operation of the lighting device 5 to output content according to the third period in the same manner as in step S1, in order to induce the user into a sleep state.

[0101] Note that in step S5, similarly to step S3, the control circuit 7 does not control the operations of the transparent display 2 and the audio device 4. However, in step S1, display of video content including video content for the first period, the second period, and the third period on the display surface 21 has started, and playback of audio content including audio content for the first period, the second period, and the third period has started. Therefore, after it is determined in step S4 that the second period has ended, when step S5 is executed, the video content for the third period following the second period is displayed on the display surface 21, and the audio content for the third period is played by the audio device 4.

[0102] 7 is a diagram showing an example of the display of video content for the third period. Fig. 7 shows an example in which, in step S5, a signal waveform video with a black background is used as third video 83, and third video 83 is displayed in video display area 211 as the video content for the third period. As shown in Fig. 7, third video 83 has a larger blacked-out area than a non-blacked-out area, and is an image with lower brightness than second video 82. In this way, by having the user view third video 83, which is lower in brightness than second video 82, the stimulus to the user's vision is reduced, and a relaxed user can be smoothly guided into a sleep-inducing state.

[0103] By playing the audio content of the third period by the audio device 4, the user's hearing is stimulated by the audio content of the third period that induces the user into a sleep state, thereby helping the user transition to a sleep state.

[0104] In step S5, the control circuit 7 may control the transparent display 2 so as not to display an image, thereby causing the display surface 21 of the transparent display 2 to be blacked out during the third period.

[0105] In step S5, the control circuit 7 outputs a control signal to the lighting control unit 50 to instruct the lighting control unit 50 to lower the brightness of the illumination light. In response to the control signal, the lighting control unit 50 drives the lighting device 5 to lower the brightness of the illumination light emitted by the lighting device 5 by a predetermined amount. However, this is not limited to this. The lighting control unit 50 may also drive the lighting device 5 in response to the control signal to lower the color tone of the illumination light emitted by the lighting device 5 by a predetermined amount, lowering the color tone of the illumination light currently being emitted. In these cases, the interior of the vehicle cabin 90 is made darker than when the second image 82 is displayed on the display surface 21, thereby reducing the visual stimulation to the user. This allows a relaxed user to smoothly fall asleep.

[0106] As in step S1, the control circuit 7 may output a control signal to the lighting control unit 50 to instruct the lighting control unit 50 to lower the brightness of the illumination light and to fluctuate the color or brightness of the illumination light. In response to the control signal, the lighting control unit 50 may drive the lighting device 5 to lower the brightness of the illumination light and fluctuate the color or brightness of the illumination light. In this case, the stimulation given to the user's vision fluctuates, providing the user with a sense of security. This allows a user in a relaxed state to smoothly transition to a sleep-inducing state.

[0107] The control circuit 7 may be configured to output a control signal instructing the lighting control unit 50 to turn off the illumination light, so that the lighting control unit 50 may drive the illumination device 5 to turn off the illumination light that is currently on in accordance with the control signal.

[0108] In addition, the control circuit 7 may control the operation of the transparent display 2 during the third period, and may not control the operation of at least one device selected from the group consisting of the audio device 4 and the lighting device 5. Alternatively, the control circuit 7 may control the operation of the lighting device 5 during the third period, and may not control the operation of at least one device selected from the group consisting of the transparent display 2 and the audio device 4.

[0109] In this embodiment, in step S5, the control circuit 7 does not control the scent control unit 60. However, as in step S1, the type of scent that will induce the user to fall asleep may be determined in advance, and in step S5, the control circuit 7 may output a control signal including information indicating the type of scent that will induce the user to fall asleep to the scent control unit 60. This may cause the scent control unit 60 to diffuse the type of scent indicated by the control signal into the vehicle interior 90 using the diffuser 6.

[0110] After step S5, the control circuit 7 ends the content output process.

[0111] In addition, when the storage unit 8 classifies and stores video content data by period, in step S1, the control circuit 7 reads out video content data for a first period from the storage unit 8 and outputs a control signal including the video content data to the video control unit 20. Similarly, in step S3, the control circuit 7 further reads out video content data for a second period from the storage unit 8 and outputs a control signal including the video content data to the video control unit 20. In step S5, the control circuit 7 further reads out video content data for a third period from the storage unit 8 and outputs a control signal including the video content data to the video control unit 20.

[0112] Similarly, if the storage unit 8 classifies and stores audio content data by period, in step S1, the control circuit 7 reads out audio content data for a first period from the storage unit 8 and outputs a control signal including the audio content data to the audio control unit 40. Similarly, in step S3, the control circuit 7 further reads out audio content data for a second period from the storage unit 8 and outputs a control signal including the audio content data to the audio control unit 40. In step S5, the control circuit 7 further reads out audio content data for a third period from the storage unit 8 and outputs a control signal including the audio content data to the audio control unit 40.

[0113] If the start timing information is stored in the storage unit 8, the control circuit 7 refers to the start timing information and determines whether the start timing of the second period has arrived, instead of determining whether the end timing of the first period has arrived, in step S2. Similarly, the control circuit 7 refers to the start timing information and determines whether the start timing of the third period has arrived, instead of determining whether the end timing of the second period has arrived, in step S4.

[0114] As described above, in the configuration of this embodiment, the hue of the image displayed on the transparent display 2 changes from green, which has the effect of easing the user's tension and stabilizing the user's psychological state, to blue, which has the effect of calming the user's psychological state, and then the brightness of the image displayed on the transparent display 2 decreases. This allows the psychological state of the user viewing the image displayed on the transparent display 2 to be gradually induced into a relaxed state. Thereafter, the visual stimulation given to the user in a relaxed state is reduced, allowing the user to smoothly transition into a sleep-inducing state.

[0115] (Experimental Results) Below, we will explain the results of a subjective evaluation experiment conducted on five subjects to assess the ease of falling asleep immediately after displaying each of the video contents under the following conditions 1 to 3. In this experiment, video contents under the following conditions 1 to 3 were displayed, and once the display of the video content under each condition had finished, the subjects were asked to rate the ease of falling asleep on a six-point scale (1 point: not at all, 2 points: not at all, 3 points: not very much, 4 points: a little bit, 5 points: yes, 6 points: very much).

[0116] As in the above embodiment, the video content under condition 1 includes video content in which a first image corresponding to a green hue is displayed during a first period, video content in which a second image corresponding to a blue hue is displayed during a second period, and video content in which a third image having a lower brightness than the second image is displayed during a third period.

[0117] The video content under condition 2 was obtained by switching the video content displayed in the first and second periods included in the video content under condition 1. That is, the video content under condition 2 included video content in which a second image corresponding to a blue hue was displayed in the first period, video content in which a first image corresponding to a green hue was displayed in the second period, and video content in which a third image lower in brightness than the second image was displayed in the third period.

[0118] The video content under condition 3 is video content in which a third video having a lower brightness than the second video is displayed in the first period, the second period, and the third period.

[0119] Fig. 8 shows an example of the experimental results. Fig. 8 shows an example of a graph showing the average ease of falling asleep replies given by five subjects immediately after the end of displaying each of the video contents under conditions 1 to 3. Fig. 8 shows that the ease of falling asleep when the video content under condition 1 was displayed was higher than when the video contents under conditions 2 and 3 were displayed.

[0120] In other words, as in the above embodiment, experimental results showed that the subjects' ease of falling asleep can be improved by displaying an image corresponding to a green hue in the first period, then displaying a second image corresponding to a blue hue in the next second period, and then displaying a third image that is less bright than the second image in the final third period.

[0121] The present disclosure can employ the following modifications.

[0122] Fig. 10 is a flowchart showing another example of content output processing in the display system 1. For example, in the display system 1, the content output processing shown in Fig. 10 may be executed instead of the content output processing shown in Fig. 4. The content output processing shown in Fig. 10 executed in the display system 1 will be described below. In the following description, it is assumed that the storage unit 8 classifies and stores data of video content and audio content by period.

[0123] Similar to the content output process shown in Fig. 4, when the control circuit 7 receives a control signal indicating an instruction to start the content output process shown in Fig. 10 from the ECU, the control circuit 7 starts the content output process shown in Fig. 10. When the content output process shown in Fig. 10 starts, the control circuit 7 reads out the data of the video content and the audio content and timing information from the storage unit 8.

[0124] (Step S10) In step S10, the control circuit 7 controls the operation of the transparent display 2 so as to display the video content for the first period.

[0125] Specifically, the control circuit 7 outputs a control signal including data of the video content for the first period read from the storage unit 8 to the video control unit 20. The video control unit 20 acquires the data of the video content for the first period from the control signal and displays the video content on the display surface 21 of the transparent display 2. As a result, the video content for the first period is displayed on the display surface 21.

[0126] (Step S11) In step S11, the control circuit 7 controls the operation of the lighting device 5 so as to output illumination light (hereinafter referred to as fluctuating illumination light) whose brightness fluctuates periodically over time at a predetermined cycle (e.g., 16 seconds).

[0127] Specifically, similar to step S1 ( FIG. 4 ), the control circuit 7 outputs a control signal including information indicating illumination light corresponding to a predetermined hue to the illumination control unit 50. The illumination control unit 50 controls the illumination device 5 to emit illumination light corresponding to the hue indicated by the control signal. The control circuit 7 further outputs a control signal to the illumination control unit 50 instructing the illumination device 5 to add a fluctuation that varies with a predetermined period to the hue or brightness of the illumination light. As a result, the illumination control unit 50 drives the illumination device 5 in accordance with the control signal so as to add a fluctuation that varies with a predetermined period to the hue or brightness of the illumination light emitted by the illumination device 5.

[0128] (Step S12) In step S12, the control circuit 7 controls the operation of the diffuser 6 so as to emit a fragrance that induces a relaxed state in the user.

[0129] Specifically, the control circuit 7 outputs a control signal including information indicating a fragrance that induces the user into a relaxed state to the fragrance control unit 60. The fragrance control unit 60 causes the diffuser 6 to diffuse the fragrance indicated by the control signal into the vehicle interior 90. Ingredients of the fragrance that induces the user into a relaxed state include, for example, Aomori hiba, fir leaf, cedarwood, cypress, and / or rosemary.

[0130] (Step S13) In step S13, the control circuit 7 controls the operation of the audio device 4 so as to output the audio content for the first period.

[0131] Specifically, the control circuit 7 outputs a control signal including data of the audio content for the first period read from the storage unit 8 to the audio control unit 40. The audio control unit 40 acquires the data of the audio content for the first period from the control signal and causes the audio device 4 to play the audio content. As a result, the audio content for the first period is played.

[0132] (Step S14) In the next step S14, similar to step S2 (FIG. 4), the control circuit 7 refers to the timing information and determines whether the end timing of the first period has arrived. The control circuit 7 waits until it determines that the end timing of the first period has arrived (NO in step S14), and when it determines that the end timing of the first period has arrived (YES in step S14), it executes step S20.

[0133] (Step S20) In step S20, the control circuit 7 controls the operation of the transparent display 2 so as to display the video content for the second period, similarly to step S10.

[0134] (Step S21) In the next step S21, the control circuit 7 controls the operation of the audio device 4 so as to output audio content for the second period, in the same manner as in step S13.

[0135] (Step S22) In the next step S22, similar to step S4 (FIG. 4), the control circuit 7 refers to the timing information and determines whether the end timing of the second period has arrived. The control circuit 7 waits until it determines that the end timing of the second period has arrived (NO in step S22), and when it determines that the end timing of the second period has arrived (YES in step S22), it executes step S30.

[0136] The control circuit 7 does not control the operation of the lighting device 5 and the diffuser 6 until it determines that the end timing of the second period has arrived (NO in step S22). However, after the output of fluctuating illumination light has begun in step S11, no control is performed to stop the lighting device 5. Therefore, fluctuating illumination light is output during the second period as well. After the emission of the fragrance that induces the user to a relaxed state has begun in step S12, no control is performed to stop the diffuser 6. Therefore, the fragrance is emitted during the second period as well.

[0137] (Step S30) In step S30, the control circuit 7 controls the operation of the transparent display 2 so as to display the video content of the third period, similarly to step S10.

[0138] (Step S31) In the next step S31, the control circuit 7 controls the operation of the illumination device 5 so as to increase the period of fluctuation in brightness of the fluctuating illumination light by a predetermined time (for example, 4 seconds).

[0139] Specifically, the control circuit 7 outputs a control signal to the illumination control unit 50 to instruct the illumination control unit 50 to increase the period of fluctuation in the color or brightness of the fluctuating illumination light for a predetermined time. As a result, the illumination control unit 50 drives the illumination device 5 in accordance with the control signal so as to increase the period of fluctuation in the color or brightness of the fluctuating illumination light for a predetermined time.

[0140] Fig. 11 is a diagram showing an example of fluctuations in brightness of fluctuating illumination light from period 1 to period 3. The horizontal axis of Fig. 11 represents the elapsed time from the start of the content output process shown in Fig. 10, and the vertical axis of Fig. 11 represents the brightness of the fluctuating illumination light lit by the illumination device 5.

[0141] 11 shows an example in which, in step S11, the control circuit 7 controls the operation of the illumination device 5 to output fluctuating illumination light whose brightness fluctuates periodically every 16 seconds, thereby setting the period of fluctuation in brightness of the fluctuating illumination light to 16 seconds in the first and second periods. Fig. 11 also shows an example in which, in step S31, the control circuit 7 controls the operation of the illumination device 5 to increase the period of fluctuation in brightness of the fluctuating illumination light by 4 seconds, thereby setting the period of fluctuation in brightness of the fluctuating illumination light to 20 seconds in the third period.

[0142] The control circuit 7 may perform the same process as step S31 after step S20 or step S21, thereby increasing the period of the fluctuation in the brightness of the fluctuating illumination light in the second period by a predetermined time compared to the period of the fluctuation in the brightness of the fluctuating illumination light in the first period.

[0143] Fig. 12 is a diagram showing another example of fluctuations in brightness of fluctuating illumination light from period 1 to period 3. The horizontal axis of Fig. 12 represents the elapsed time from the start of the content output process shown in Fig. 10, and the vertical axis of Fig. 12 represents the brightness of the fluctuating illumination light lit by the illumination device 5.

[0144] FIG. 12 shows an example in which, in step S11, the control circuit 7 controls the operation of the lighting device 5 so as to output fluctuating illumination light whose brightness fluctuates periodically every 12 seconds, resulting in a period of fluctuation in the brightness of the fluctuating illumination light during the first period of time of 12 seconds.

[0145] FIG. 12 shows an example in which, following step S20 or step S21, processing similar to step S31 is performed, and the control circuit 7 controls the operation of the lighting device 5 so as to increase the period of fluctuation in the brightness of the fluctuating illumination light by 4 seconds, resulting in a period of fluctuation in the brightness of the fluctuating illumination light in the second period of 16 seconds.

[0146] FIG. 12 shows an example in which, in step S31, the control circuit 7 controls the operation of the lighting device 5 so as to increase the period of fluctuation in the brightness of the fluctuating illumination light by 26 seconds, resulting in a period of fluctuation in the brightness of the fluctuating illumination light during the third period of 42 seconds.

[0147] In step S11, the control circuit 7 may control the operation of the illumination device 5 to emit illumination light corresponding to a green hue as fluctuating illumination light, similar to step S1 (FIG. 4). Then, after step S20 or step S21, the control circuit 7 may control the operation of the illumination device 5 to emit illumination light corresponding to a blue hue as fluctuating illumination light, similar to step S3 (FIG. 4). Furthermore, after step S30, the control circuit 7 may control the operation of the illumination device 5 to emit illumination light of a lower brightness than that in the second period as fluctuating illumination light, similar to step S5 (FIG. 4).

[0148] Returning to Figure 10, (Step S32) In step S32 following step S31, the control circuit 7 controls the operation of the diffuser 6 to stop emitting the fragrance that induces the user into a relaxed state.

[0149] Specifically, the control circuit 7 outputs a control signal to the scent control unit 60 to instruct the scent control unit 60 to stop emitting the scent. The scent control unit 60 stops diffusing the scent by the diffuser 6 in accordance with the control signal.

[0150] In step S22 of the content output process shown in FIG. 10 , the control circuit 7 may refer to the timing information and determine whether the timing is a predetermined time earlier than the end timing of the second period. As a result, the processing from step S30 onward may be performed a predetermined time earlier than the end timing of the second period. Alternatively, in step S22 of the content output process shown in FIG. 10 , the control circuit 7 may determine that the end timing of the second period has arrived, and then perform the processing from step S30 onward after a predetermined time has elapsed. In other words, the start timing of the third period in the present disclosure may be simultaneous with the start of the third period, immediately before the start of the third period, or immediately after the start of the third period.

[0151] In the content output process shown in Fig. 10, steps S12 and S32 may be omitted, and steps S13 and S21 may also be omitted. Alternatively, in the content output process shown in Fig. 10, steps S11 and S31 may be omitted, and steps S13 and S21 may also be omitted. Alternatively, in the content output process shown in Fig. 10, steps S11 and S31 may be omitted, and steps S12 and S32 may also be omitted.

[0152] 10 , steps S10, S20, and S30 may be omitted, and the control circuit 7 may control the operation of the illumination device 5 in step S11 to turn on illumination light corresponding to a green hue as fluctuating illumination light, similar to step S1 ( FIG. 4 ). Then, after step S20 or step S21, the control circuit 7 may control the operation of the illumination device 5 to turn on illumination light corresponding to a blue hue as fluctuating illumination light, similar to step S3 ( FIG. 4 ). Furthermore, after step S30, the control circuit 7 may control the operation of the illumination device 5 to turn on illumination light of a lower brightness than that in the second period as fluctuating illumination light, similar to step S5 ( FIG. 4 ).

[0153] In the content output process shown in Fig. 10, steps S12 and S32 may be omitted. In the content output process shown in Fig. 10, steps S13 and S21 may be omitted. In the content output process shown in Fig. 10, steps S11 and S31 may be omitted.

[0154] The display system 1 may be placed not only in the vehicle 9 but also in a room such as a break space in an office. In this case, at least one selected from the group consisting of the sound device 4, the lighting device 5, and the diffuser 6 may be provided on a seat such as a massage chair or sofa arranged to face the display surface 21 of the transparent display 2. When the display system 1 is placed indoors, the transparent display 2 may not be provided, and the lighting device 5 may be provided on the massage chair.

[0155] The display system 1 may include the transparent display 2 but may not include at least one device selected from the group consisting of the acoustic device 4, the lighting device 5, and the diffuser 6. Alternatively, the display system 1 may include the lighting device 5 but may not include at least one device selected from the group consisting of the transparent display 2, the acoustic device 4, and the diffuser 6.

[0156] The technology of the present disclosure is useful in the technical field of in-vehicle equipment and in office settings.

[0157] 1: Display system (system) 2: Transparent display (image projection component) 4: Acoustic device 5: Lighting device 6: Diffuser 7: Control circuit (control device) 9: Vehicle (moving object) 21: Display surface 81: First image 82: Second image 83: Third image 991: Surface parallel to the display surface

Claims

1. A system comprising an image projection member and a control device, wherein the control device causes the image projection member to display image content that induces a user to rest, and the image content includes: content in which a first image corresponding to a green hue is displayed in a first period; content in which a second image corresponding to a blue hue is displayed in a second period after the first period; and content in which a third image is displayed in a third period after the second period, and the brightness of the third image is lower than the brightness of the second image.

2. The system according to claim 1, wherein the first image has an area of the green hue larger than an area of a hue different from the green hue when viewed in terms of time average.

3. The system according to claim 1, wherein the second image has an area of the blue hue larger than an area of a hue different from the blue hue when viewed in terms of time average.

4. The system according to claim 1, further comprising an illumination device disposed on a plane parallel to the display plane of the image content in the image projection member, and the control device causes the illumination device to emit illumination light corresponding to the green hue in the first period.

5. The system according to claim 1, further comprising an illumination device disposed on a plane parallel to the display plane of the image content in the image projection member, and the control device causes the illumination device to emit illumination light corresponding to the blue hue in the second period.

6. The system according to claim 1, wherein the third image has an area that is blacked out larger than an area that is not blacked out when viewed in terms of time average.

7. The system according to claim 1, wherein the control device controls the operation of at least one of a plurality of devices that perform an operation of stimulating any one of the five senses of a user who views the image content, together with the display of the image content.

8. The system according to claim 7, wherein the plurality of devices include an acoustic device and a diffuser.

9. A system comprising a lighting device and a control device, wherein the control device causes the lighting device to emit first illumination light corresponding to a green hue in a first period, second illumination light corresponding to a blue hue in a second period after the first period, and third illumination light in a third period after the second period, and the brightness of the third illumination light is lower than that of the second illumination light.

10. A moving body comprising a video projection member and a control device, wherein the control device causes the video projection member to display video content, and the video content includes content in which a first video corresponding to a green hue is displayed in a first period, content in which a second video corresponding to a blue hue is displayed in a second period after the first period, and content in which a third video is displayed in a third period after the second period, and the brightness of the third video is lower than that of the second video.

11. The system according to claim 1, further comprising a lighting device, wherein the control device causes the lighting device to emit illumination light in the first period, the second period, and the third period, periodically varies the brightness of the illumination light over time in the first period and the second period, and increases the period of the variation in the brightness of the illumination light at the start of the third period.

12. The system according to claim 1, further comprising a fragrance releasing device, wherein the control device controls the fragrance releasing device to release a fragrance that induces the user to a relaxed state in the first period and the second period, and stops the release of the fragrance at the start of the third period.

13. The system according to claim 1, further comprising an acoustic device, wherein the control device controls the acoustic device to output a bird sound having a frequency component above a predetermined reference frequency as a peak in the first period, and controls the acoustic device to output a bird sound having a frequency component below the reference frequency as a peak in the second period.

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