Display unit and moving body

Abstract

A display unit 1 disposed in a moving body 9 includes: a transparent video projection member 2 that has a display surface 21 and a back surface 22; and a light shielding screen 3 that opens and closes facing the back surface 22. The video projection member 2 is positioned between a rear seat 92 of the moving body 9 and the light shielding screen 3, and is disposed so that the display surface 21 and the outside view in a traveling direction of the moving body 2 overlap when viewed from the rear seat 92.

Description

Display unit and mobile unit

[0001] The present disclosure relates to techniques for displaying video content on a transparent video projection component.

[0002] In recent years, a technology has become known that uses a transparent image projection component such as an organic electroluminescence (EL) display to allow a user to simultaneously view an image displayed on the display surface of the image projection component and the scenery behind the image projection component. For example, Patent Document 1 describes a technology in which a transparent display is provided between the windshield and the driver's seat, and the transmittance of a light-shielding image displayed behind the image displayed on the transparent display is adjusted according to the intensity of light directed toward the transparent display.

[0003] Japanese Patent Application Laid-Open No. 2020-79917

[0004] Patent document 1 only discloses control for adjusting the visibility of a transparent display in the driver's seat of a moving body, but does not take into consideration adjusting the visibility of the scenery in the direction of travel of the moving body and the transparent display in the rear seat of the moving body.

[0005] The present disclosure provides a technology for effectively switching between a state in which visibility of the scenery in the direction of travel of a vehicle is high and a state in which visibility of the display surface of a transparent image projection component is high in the rear seat of the vehicle.

[0006] In one aspect of the present disclosure, the display unit is a display unit placed on a mobile body, and comprises a transparent image projection member having a display surface and a back surface, and a shading screen that opens and closes opposite the back surface, the image projection member being positioned between the rear seat of the mobile body and the shading screen, and being positioned so that the display surface and the view in the direction of travel of the mobile body overlap when viewed from the rear seat.

[0007] According to the present disclosure, it is possible to effectively switch between a state in which the visibility of the scenery in the direction of travel of a moving body is high and a state in which the visibility of the display surface of a transparent image projection component is high in the rear seat of the moving body.

[0008] FIG. 1 is a diagram showing an example of a top view of a vehicle equipped with a display unit. FIG. 2 is a diagram showing an example of a side view of a vehicle when the light-blocking screen is in an open state. FIG. 3 is a diagram showing an example of a side view of a vehicle when the light-blocking screen is in a closed state. FIG. 4 is a diagram showing an example of an arrangement position of a seat stopper. FIG. 5 is a diagram showing an example of a side view of a display unit. FIG. 6 is a diagram showing an example of a perspective view of a display unit. FIG. 7 is a diagram showing an example of a front view of a display unit. FIG. 8 is a block diagram showing an example of an electrical configuration of a display unit. FIG. 9 is a diagram showing an example of visibility of a transparent display in a rear seat. FIG. 10 is a diagram showing an example of visibility of a transparent display in a rear seat.

[0009] (Findings underlying the present disclosure) As described above, in recent years, a technology has been known that uses a transparent image projection component such as an organic EL display to allow a user to simultaneously view an image projected on the display surface of the image projection component and a landscape behind the image projection component. This technology is being considered for use in various situations, such as when a driver of a moving body such as a vehicle is allowed to simultaneously view a landscape in the direction of travel of the moving body and an image related to the landscape, as described in Patent Document 1 above.

[0010] Unlike Patent Document 1, the present inventor has been considering utilizing the above technology for rear seat passengers who do not need to keep their eyes on the scenery in the direction of travel of the moving vehicle. In this study, the present inventor has found that if rear seat passengers are allowed to simultaneously view an image displayed on a transparent image projection member and the scenery behind the image projection member, the visibility of the image decreases, but the frequency with which the passengers complain of physical conditions such as car sickness or headaches decreases.

[0011] Based on this finding, the inventors have considered that, in order to make the rear seats of a vehicle a comfortable environment for occupants, it may be possible to effectively switch between a state in which the visibility of the scenery in the direction of travel of the vehicle is high and a state in which the visibility of the display surface of a transparent image projection member is high in the rear seats. The scenery behind the image projection member may be interpreted as the scenery perceived by the driver of the vehicle through the windshield of the vehicle.

[0012] Based on the above findings, the inventors have thoroughly studied technology for effectively switching between a state in which the visibility of the scenery in the direction of travel of a moving body is high and a state in which the visibility of the display surface of a transparent image projection component is high in the rear seat of the moving body, and have come up with the various aspects of the present disclosure described below.

[0013] (1) In one aspect of the present disclosure, the display unit is a display unit placed on a moving body, and comprises a transparent image projection member having a display surface and a back surface, and a shading screen that opens and closes opposite the back surface, the image projection member being positioned between the rear seat of the moving body and the shading screen, and being positioned so that the display surface and the view in the direction of travel of the moving body overlap when viewed from the rear seat.

[0014] According to this configuration, by opening the shading screen, light traveling from the back of the image projection member toward the display surface is transmitted, thereby improving the visibility of the scenery in the direction of travel of the vehicle in the rear seats of the vehicle. On the other hand, according to this configuration, by closing the shading screen, light traveling from the back of the image projection member toward the display surface is blocked, thereby improving the visibility of the display surface in the rear seats of the vehicle. In other words, according to this configuration, by opening and closing the shading screen, it is possible to effectively switch between a state in which the visibility of the scenery in the direction of travel of the vehicle in the rear seats of the vehicle is high and a state in which the visibility of the display surface of the transparent image projection member is high in the rear seats of the vehicle.

[0015] (2) In the display unit described in (1) above, the shading screen may be a roll screen that rolls up a sheet-like shading material, and the winding opening of the shading material may be located closer to the back surface than the winding shaft of the shading material.

[0016] According to this configuration, the winding port of the shading member is located closer to the back of the image projection member than the winding axis of the shading member, thereby reducing the risk of the front seat coming into contact with the shading member when the front seat of the mobile object is moved toward the rear seat by reclining, etc.

[0017] (3) The display unit described in (1) above may further include a stopper member that is erected between the front seat of the vehicle and the light-shielding screen and faces the front seat.

[0018] According to this configuration, the stopper member that stands facing the front seat is provided between the front seat and the sunshade screen, so that the range of movement of the front seat when moving toward the rear seat can be limited, thereby reducing the risk of the front seat coming into contact with the sunshade screen.

[0019] (4) In the display unit described in (1) above, the shading screen is a roll screen that rolls up a sheet-like shading material, and the shading material includes one end where a weight bar is provided and the other end where a winding shaft is provided, and the one end faces the other end, and may further include a bracket that magnetically holds the weight bar in a direction along the winding shaft from the back surface.

[0020] With this configuration, the weight bar at the end of the light-blocking member opposite the winding shaft is pulled along the back surface and abutted against the bracket. This allows the weight bar to be fixed to the bracket by magnetic force while the light-blocking member faces the back surface. This blocks light traveling from the back surface of the image projection member to the display surface and reduces shaking of the light-blocking member due to vibrations of the moving object. As a result, the risk of the light-blocking member coming into contact with the image projection member is reduced.

[0021] (5) The display unit described in (1) above may further include a control circuit, the control circuit displays video content on the display surface, the video content includes multiple phases, and the control circuit may control the opening and closing of the shading screen depending on the phase displayed on the display surface.

[0022] According to this configuration, it is possible to guide the passengers in the rear seats to various states according to the phase displayed on the display screen.

[0023] (6) In the display unit described in (5) above, the multiple phases may include a relaxation phase that induces the rear seat occupants to a relaxed state, a sleep phase that induces the occupants to a sleep state, and an awakening phase that induces the occupants to an awakening state.

[0024] According to this configuration, the passengers in the rear seats can be guided into a relaxed state, a sleeping state, or an awake state depending on the phase displayed on the display screen.

[0025] (7) In the display unit described in (3) above, the stopper member may be positioned so as to satisfy (b / a) < (A / B), where a is the distance from the bottom surface of the front seat to the upper end of the stopper member in the vertical direction of the moving body, b is the distance from the rear end of the bottom surface of the front seat to the stopper member in the direction of travel of the moving body, A is the distance from the bottom surface of the front seat to the contact point between the front seat and the shading screen in the vertical direction when the front seat comes into contact with the shading screen, and B is the distance from the shading screen to the rear end of the bottom surface of the front seat in the direction of travel.

[0026] This configuration reduces the risk of the front seats coming into contact with the shade screen when the front seats are reclined.

[0027] (8) The display unit described in (1) above may further include a control circuit, and the control circuit may control opening and closing of the light-shielding screen in response to an instruction input by an occupant of the vehicle.

[0028] According to this configuration, the occupant of the vehicle can control the opening and closing of the light-shielding screen at any timing, taking into consideration his or her own physical condition and / or mood.

[0029] (9) In another aspect of the present disclosure, a mobile body is provided with a display unit, the display unit comprising a transparent image projection member having a display surface and a back surface, and a shading screen that opens and closes opposite the back surface, the image projection member being positioned between the rear seat of the mobile body and the shading screen, and being arranged so that the display surface and the view in the direction of travel of the mobile body overlap when viewed from the rear seat.

[0030] According to this configuration, the same effects as those of the display unit described in (1) above can be obtained.

[0031] Note that the embodiments described below each illustrate a specific example of the present disclosure. The numerical values, shapes, components, processes, processing orders, etc. shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components that are not described in an independent claim that represents a top-level concept are described as optional components. Furthermore, in all embodiments, the respective contents can be combined.

[0032] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0033] (Embodiment 1) FIG. 1 is a diagram showing an example of a top view of a vehicle 9 equipped with a display unit 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.

[0034] 1, the display unit 1 is disposed between a front seat 91 and a rear seat 92 in a vehicle 9 (mobile body) such as a passenger car, bus, taxi, etc. Specifically, the display unit 1 includes a transparent display (image projection member) 2, a light-shielding screen 3, a seat stopper 4 (stopper member), and a frame 5 that supports these.

[0035] The front seat 91 includes a driver's seat of the vehicle 9. The rear seat 92 does not include a driver's seat of the vehicle 9.

[0036] 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 rear seats 92, and the driver's seat and passenger seat included in the first row of seats may be front seats 91. Alternatively, the seats included in the third row of seats may be 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 front seats 91.

[0037] Fig. 2 is a diagram showing an example of a side view of the vehicle 9 when the shading screen 3 is in an open state. Fig. 3 is a diagram showing an example of a side view of the vehicle 9 when the shading screen 3 is in a closed state. As shown in Figs. 2 and 3, 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.

[0038] The transparent display 2 is supported by the frame 5 at a position between the rear seat 92 of the vehicle 9 and the light-shielding screen 3, 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. 8 ), 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%.

[0039] A transparent light-control film (light-control sheet) may be provided on the back surface 22 of the transparent display 2, and the light-control film (light-control sheet) adjusts the light-blocking rate (light transmittance) of the back surface 22 under the control of a control circuit 7 (FIG. 8) described later. Also, 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 made of translucent glass. In this way, the projector may project video content onto the display surface 21 of the glass under the control of the control circuit 7 (FIG. 8) described later, thereby displaying the video content on the display surface 21.

[0040] The light-shielding screen 3 is a roll screen that rolls up a sheet-like light-shielding member 31, and opens and closes in the vertical direction (Z direction) facing the back surface 22 of the transparent display 2. The light-shielding member 31 is a sheet-like member that is longer in the longitudinal direction than the transparent display 2 and also longer in the lateral direction than the lateral direction of the transparent display 2. The light-shielding member 31 has a constant light-shielding rate of 100% (complete light-shielding) or 95% or more.

[0041] Fig. 2 shows an example of an open state of the light-shielding screen 3 (hereinafter referred to as the open state), and Fig. 3 shows an example of a closed state of the light-shielding screen 3. Specifically, the light-shielding screen 3 includes a winding section 30 that opens and closes a sheet-like light-shielding member 31 in the vertical direction.

[0042] The winding unit 30 includes a motor (not shown) controlled by a control circuit 7 (FIG. 8) described below, and a winding shaft 301 that is rotated by the motor around an axis (hereinafter referred to as the X-axis) parallel to the left-right direction (X-direction).

[0043] One end of the light blocking member 31 is attached to a winding shaft 301 inside the winding unit 30. The end of the light blocking member 31 opposite the winding shaft 301, i.e., the end in the -Z direction, is pulled downward from a winding opening 302 and wound upward as the winding shaft 301 is rotated about the X axis by a motor provided in the winding unit 30. The winding opening 302 is located closer to the back surface 22 than the winding shaft 301. A metal weight bar 32 is attached to the end of the light blocking member 31 opposite the winding shaft 301, i.e., the end in the -Z direction.

[0044] A bracket 6 that detachably holds the weight bar 32 by magnetic force is provided below the rear surface 22 of the transparent display 2 in a direction from the winding shaft 301 along the rear surface 22. The bracket 6 is supported by a frame 5. A part or all of the upper surface of the bracket 6 is made of a magnetic member such as a magnet.

[0045] Therefore, one end of the light-blocking member 31 to which the weight bar 32 is attached is pulled downward along the back surface 22 from the winding port 302 by the winding section 30, and when the weight bar 32 abuts against the upper surface of the bracket 6, the metal weight bar 32 is fixed to the bracket 6 by magnetic force. This brings the light-blocking screen 3 into a closed state, and the light-blocking member 31, which is longer in the longitudinal and lateral directions than the back surface 22, blocks light traveling from the back surface 22 of the transparent display 2 toward the display surface 21. As a result, the visibility of the display surface 21 in the rear seat 92 of the vehicle 9 can be improved.

[0046] On the other hand, when one end of the light-blocking member 31 to which the weight bar 32 is attached is wound up to the winding opening 302 by the winding section 30, the weight bar 32 abuts against and is fixed to the winding opening 302. This places the light-blocking screen 3 in an open state, allowing light traveling from the back surface 22 of the transparent display 2 toward the display surface 21 to pass through. As a result, visibility of the scenery in the direction in which the vehicle 9 is traveling from the rear seat 92 of the vehicle 9 can be improved.

[0047] At least the area of ​​the circumferential surface of the weight bar 32 that comes into contact with the bracket 6 may be made of a magnetic material such as a magnet, and the bracket 6 may be made of metal. Alternatively, at least the area of ​​the circumferential surface of the weight bar 32 that comes into contact with the bracket 6 and part or all of the area of ​​the upper surface of the bracket 6 may be provided with magnets having different magnetic polarities.

[0048] However, as described above, if the weight bar 32 is made of metal and part or all of the upper surface of the bracket 6 is made of a magnetic material, it is possible to avoid the weight bar 32 being held by magnetic force to the metal near the front seat 91 as it moves from the winding port 302 to the bracket 6.

[0049] The seat stoppers 4 are screwed to the frame 5 between each of the two front seats 91 (FIGS. 1 to 3) and the sunshade screen 3, and are erected facing the front seats 91. This makes it possible to limit the range of movement of the front seats 91 when reclining or otherwise moving them toward the rear seats 92. As a result, the risk of the front seats 91 coming into contact with the sunshade screen 3 can be reduced.

[0050] The seat stopper 4 may be disposed, for example, as follows. FIG. 4 is a diagram showing an example of the position of the seat stopper 4. Hereinafter, when the front seat 91 is reclined until it contacts the light-shielding member 31, the angle formed between the front seat 91 and a plane parallel to the light-shielding member 31 is referred to as θ, and the distance from the bottom surface of the front seat 91 to the contact point between the front seat 91 and the light-shielding member 31 in the vertical direction (Z direction) is referred to as A. Furthermore, the distance from the light-shielding member 31 to the rear end 911 of the bottom surface of the front seat 91 in the front-rear direction (Y direction) is referred to as B. The distance from the bottom surface of the front seat 91 to the top end of the seat stopper 4 in the vertical direction (Z direction) is referred to as a, and the distance from the rear end 911 of the front seat 91 to the seat stopper 4 in the front-rear direction (Y direction) is referred to as b.

[0051] 4, when the front seat 91 comes into contact with the light-shielding member 31, the relational expression "b = a x tan θ" is established. Therefore, in order to prevent the front seat 91 from coming into contact with the light-shielding member 31, the seat stopper 4 should be positioned so that the relational expression "b < (a x tan θ)" is established. Since "tan θ" is equal to "A / B," the above relational expression "b < (a x tan θ)" can be transformed into the relational expression "(b / a) < (A / B)."

[0052] In other words, the seat stopper 4 should be positioned so that the relationship "(b / a) < (A / B)" is satisfied, where a is the distance from the bottom surface of the front seat 91 to the top end of the seat stopper 4 in the vertical direction (Z direction), b is the distance from the rear end 911 of the bottom surface of the front seat 91 to the seat stopper 4 in the front-to-back direction (Y direction), A is the distance from the bottom surface of the front seat 91 to the contact point between the front seat 91 and the shading member 31 in the vertical direction (Z direction) when the front seat 91 comes into contact with the shading member 31, and B is the distance from the shading member 31 to the rear end 911 of the bottom surface of the front seat 91 in the front-to-back direction (Y direction).

[0053] Next, the structure of the frame 5 that supports the transparent display 2, the light-shielding screen 3, and the sheet stopper 4 will be described. Fig. 5 is a diagram showing an example of a side view of the display unit 1. Fig. 6 is a diagram showing an example of a perspective view of the display unit 1. Fig. 7 is a diagram showing an example of a front view of the display unit 1.

[0054] The frame 5 includes a pair of support members 51, 52 (FIGS. 5 to 7) extending in the up-down direction (Z direction). The pair of support members 51, 52 (FIGS. 5 to 7) support both ends of the transparent display 2 in the left-right direction (X direction). This reduces left-right vibration of the transparent display 2 while the vehicle 9 is traveling. This reduces the frequency of passengers in the rear seats 92 viewing the video content displayed on the display surface 21 becoming car sick or experiencing other health problems.

[0055] Note that one of the pair of support members 51, 52 (FIGS. 5 to 7) may be omitted so that only one end of the transparent display 2 in the left-right direction (X direction) is supported. "Only one end of the transparent display 2 in the left-right direction (X direction) is supported" may be interpreted as "the first end is supported and the second end is not supported" or "the first end is not supported and the second end is supported." The transparent display 2 may include the first end and the second end in the left-right direction (X direction). The first end may face the second end.

[0056] The frame 5 further includes a support member 53 (FIGS. 5 and 6) extending in the left-right direction (X direction). The support member 53 (FIGS. 5 and 6) supports the upper end of the transparent display 2 and the winding portion 30 of the light-shielding screen 3. The support member 53 (FIGS. 5 and 6) is attached to the upper ends of the pair of support members 51 and 52.

[0057] Therefore, when the winding unit 30 pulls downward one end of the light blocking member 31 (FIG. 3) to which the weight bar 32 is attached, the end can be moved downward by the weight of the light blocking member 31 (FIG. 3) and the weight bar 32. This reduces the rotational force of the winding shaft 301 required for the winding unit 30 to pull the end downward.

[0058] Furthermore, one left-right end of the support member 53 (FIGS. 5 and 6) may be attached to the upper end of one of the pair of support members 51, 52 (FIGS. 5 to 7), so that the other left-right end of the support member 53 (FIGS. 5 and 6) is not supported.

[0059] The frame 5 further includes a support member 54 (FIGS. 5 to 7) extending in the left-right direction (X direction). The support member 54 (FIGS. 5 to 7) is a member that supports the seat stopper 4 and the bracket 6.

[0060] The support member 54 (FIGS. 5 to 7) has both ends in the left-right direction (X direction) at the rear (+Y direction) attached to a pair of support members 51, 52 (FIGS. 5 to 7). The support member 54 (FIGS. 5 to 7) supports the bracket 6 at a position lower (-Z direction) than the bottom end of the transparent display 2 and forward (+Y direction) than the back surface 22. This reduces the possibility that the light blocking member 31 will come into contact with the back surface 22 when the weight bar 32 is fixed to the bracket 6.

[0061] Furthermore, a seat stopper 4 is attached to the front (-Y direction) surface of the support member 54 (FIGS. 5 to 7) so as to face the front seat 91. This allows the seat stopper 4 to be separated from the pair of support members 51, 52 (FIGS. 5 to 7) by the length of the support member 54 (FIGS. 5 to 7) in the fore-and-aft direction (Y direction). This makes it possible to limit the range of movement when the front seat 91 is moved toward the rear seat 92 by reclining or the like. As a result, the risk of the front seat 91 coming into contact with the light-shielding screen 3 can be reduced.

[0062] Next, a description will be given of the electrical configuration of the display unit 1. Fig. 8 is a block diagram showing an example of the electrical configuration of the display unit 1. The display unit 1 further includes a storage unit 8 and a control circuit 7.

[0063] The storage unit 8 is configured with a non-volatile rewritable storage device such as a hard disk drive or a solid state drive. The storage unit 8 pre-stores data of the video content to be displayed on the display surface 21. The video content includes multiple phases. Examples of the multiple phases that can be used include a relax phase, a sleep phase following the relax phase, and a wake phase following the sleep phase.

[0064] The relaxation phase is a phase in which the occupants in the rear seats 92 are guided to a relaxed state. The video content of the relaxation phase is, for example, video content that captures forest scenes and / or lush green rivers. The sleep phase is a phase in which the occupants in the rear seats 92 are guided to a sleep state. The video content of the sleep phase is, for example, abstract images such as signal waveforms. The wakefulness phase is a phase in which the occupants in the rear seats 92 are guided to a wakeful state. The video content of the wakefulness phase is, for example, video content that captures scenes of dawn and / or scenes of a grassland during the day.

[0065] However, the multiple phases included in the video content and the order of each phase are not limited to the above. The storage unit 8 may store the video content data without dividing it into phases, or may store it by dividing it into phases.

[0066] The storage unit 8 also stores in advance information indicating the end timing of each phase (hereinafter, end timing information). The end timing of each phase is determined, for example, by the amount of time that has elapsed since the video content of the first phase was displayed on the display surface 21. However, the end timing of each phase is not limited to this, and may also be determined by time.

[0067] The storage unit 8 may be configured to store in advance information indicating the start timing of each phase (hereinafter, start timing information) in the same manner as the end timing information. Alternatively, the storage unit 8 may be configured to store in advance start timing information without storing in advance the end timing information.

[0068] The control circuit 7 includes a central processing unit (CPU) (not shown) and memories (not shown) such as a ROM and a RAM. The control circuit 7 is communicatively connected to the storage unit 8, the transparent display 2, and the winding unit 30. 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.

[0069] The control circuit 7 reads out the video content and timing information stored in the memory unit 8. The control circuit 7 controls the transparent display 2 to display the video content on the display surface 21. The control circuit 7 controls the opening and closing of the light-shielding screen 3 by controlling a motor (not shown) provided in the winding unit 30 to rotate the winding shaft 301 around the X-axis.

[0070] 9 to 11 are diagrams showing an example of the visibility of the transparent display 2 in the rear seat 92. Specifically, when the control circuit 7 receives a control signal indicating an instruction to start displaying the video content from the ECU, the control circuit 7 starts the display processing of the video content. The control signal indicating the start instruction is input to the ECU by the occupant operating a mobile terminal such as a tablet terminal or an operating device installed in the vehicle 9.

[0071] When the data of the video content is stored in the storage unit 8 without being classified by phase, the control circuit 7 reads out the data of the video content and timing information from the storage unit 8. The control circuit 7 outputs a control signal indicating an instruction to display the video content on the display surface 21, together with the data of the video content, to the transparent display 2. As a result, the transparent display 2 displays the video content indicated by the data received together with the control signal on the display surface 21, in accordance with the instruction indicated by the control signal.

[0072] In addition, the control circuit 7 controls a motor (not shown) provided in the winding unit 30 to open and close the shading screen 3 so as to guide the passenger in the rear seat 92 into a state corresponding to the phase displayed on the display surface 21.

[0073] For example, if the video content includes a relax phase, a sleep phase following the relax phase, and a wakefulness phase following the sleep phase, as described above, the control circuit 7 controls a motor (not shown) provided in the winding unit 30 to close the light-shielding screen 3 in order to induce the passenger in the rear seat 92 to a relaxed state corresponding to the relax phase, which is the first phase.

[0074] This blocks light traveling from the back surface 22 (FIG. 3) of the transparent display 2 toward the display surface 21 (FIG. 3). Therefore, as shown in FIG. 9, for example, the video content of the relaxation phase is displayed on the display surface 21 without being transmitted. As a result, by having the passenger in the rear seat 92 focus on the video content of the relaxation phase, the passenger can be guided into a relaxed state.

[0075] When the control circuit 7 determines by referring to the timing information that the end time of the relaxation phase has arrived, it continues to keep the shading screen 3 closed in order to induce the passenger in the rear seat 92 into a sleep state corresponding to the sleep phase following the relaxation phase.

[0076] As a result, light traveling from the back surface 22 (FIG. 3) of the transparent display 2 toward the display surface 21 (FIG. 3) remains blocked from the time when the video content for the relaxation phase is displayed. Therefore, similar to FIG. 9, the video content for the sleep phase is displayed on the display surface 21 without being transmitted through the transparent display 2. As a result, by having the passenger in the rear seat 92 gaze at the video content for the sleep phase, the passenger can be induced to fall asleep.

[0077] When the control circuit 7 determines that the time has come to end the sleep phase by referring to the timing information, it controls a motor (not shown) provided in the winding section 30 to open the shading screen 3 in order to guide the occupant in the rear seat 92 into an awake state corresponding to the awake phase that follows the sleep phase.

[0078] This allows light traveling from the back surface 22 ( FIG. 2 ) of the transparent display 2 to pass through to the display surface 21 ( FIG. 2 ). Therefore, as shown in FIG. 10 , for example, the occupant in the rear seat 92 can simultaneously view the video content of the wakefulness phase displayed on the display surface 21 and the scenery in the direction of travel of the vehicle 9, such as the front seat 91. As a result, the occupant in the rear seat 92 can be made aware that the vehicle 9 is moving, and the occupant can be guided into an awakened state.

[0079] Then, the control circuit 7 refers to the timing information, and when it determines that the timing for ending the awakening phase has arrived, it terminates control of the transparent display 2 and the winding unit 30. As a result, the video content is no longer displayed on the display surface 21, and because the light-shielding screen 3 is in the open state, light traveling from the back surface 22 of the transparent display 2 toward the display surface 21 ( FIG. 2 ) is transmitted. Therefore, the passenger in the rear seat 92 can view the scenery in the traveling direction of the vehicle 9, including the front seat 91, which is located forward (in the +Y direction) of the transparent display 2, as shown in FIG. 11 .

[0080] It is assumed that the data of the video content is classified by phase and stored in the storage unit 8. In this case, the control circuit 7 reads out the data of the video content of the first phase from the storage unit 8 and displays the video content on the display surface 21. Thereafter, when the control circuit 7 determines that the end timing of each phase has arrived, it may read out the data of the video content of the next phase from the storage unit 8 and display the video content of the next phase on the display surface 21.

[0081] Furthermore, if start timing information is stored in the memory unit 8, the control circuit 7 may refer to the start timing information and control the transparent display 2 and the winding unit 30 in the same manner as described above when it determines that the start timing for each phase has arrived.

[0082] The present disclosure can employ the following modifications.

[0083] (1) In the above embodiment, an example has been described in which the shading screen 3 (FIGS. 2 and 3) is a roll screen that rolls up the sheet-like shading member 31. However, the shading screen 3 may be a curtain screen that opens and closes a curtain-like shading member having the same shading rate as the shading member 31 in the left-right direction (X direction) under the control of the control circuit 7.

[0084] (2) In the above embodiment, the winding unit 30 (FIGS. 2 and 3) of the light-blocking screen 3 pulls out the light-blocking member 31 from top to bottom and winds up the light-blocking member 31 from bottom to top, thereby opening and closing the light-blocking screen 3 in the vertical direction. However, contrary to the above embodiment, the winding unit 30 may be disposed below the lower end of the transparent display 2. In this way, the winding unit 30 may pull out the light-blocking member 31 from bottom to top and wind up the light-blocking member 31 from top to bottom, thereby opening and closing the light-blocking screen 3 in the vertical direction.

[0085] Similarly, the winding unit 30 may be disposed to the left of the left end of the transparent display 2 so that the winding unit 30 pulls out the light-blocking member 31 from left to right and winds it up from right to left, thereby opening and closing the light-blocking screen 3 in the left-right direction. Conversely, the winding unit 30 may be disposed to the right of the right end of the transparent display 2 so that the winding unit 30 pulls out the light-blocking member 31 from right to left and winds it up from left to right, thereby opening and closing the light-blocking screen 3 in the left-right direction.

[0086] (3) The control circuit 7 may control the opening and closing of the light shielding screen 3 in response to an instruction input by an occupant of the vehicle 9. In this case, the light shielding screen 3 can be opened and closed at any timing, taking into consideration the physical condition and / or mood of the occupant of the vehicle 9. This configuration can be realized, for example, as follows.

[0087] Specifically, when the control circuit 7 receives a control signal instructing the shading screen 3 to open or close, it controls a motor (not shown) provided in the winding unit 30 to open or close the shading screen 3 in accordance with the control signal.

[0088] A control signal indicating an instruction to open or close the shading screen 3 is input by an occupant in the rear seat 92, for example, via a user interface presented by a computer such as a tablet terminal mounted inside the vehicle 9, and then input to the control circuit 7 via the ECU or by wired or wireless communication.

[0089] The control signal may be input by an occupant in the rear seat 92 via a user interface provided by a computer on a mobile terminal such as a smartphone or a smartwatch owned by the occupant in the rear seat 92, rather than being input via a computer on a tablet terminal or the like mounted inside the vehicle 9. The control signal may also be input by an occupant in the front seat 91 via a user interface provided by a car navigation system or the like operable in the front seat 91.

[0090] The technology of the present disclosure is useful in the technical field of in-vehicle devices.

[0091] 1: Display unit 2: Transparent display (image projection component) 3: Light-shielding screen 4: Seat stopper (stopper component) 6: Bracket 7: Control circuit 9: Vehicle (moving body) 21: Display surface 22: Back surface 31: Light-shielding component 32: Weight bar 91: Front seat 92: Rear seat 301: Winding shaft 302: Winding port

Claims

1. A display unit disposed in a moving body, comprising: a transparent video projection member having a display surface and a back surface; and a light-shielding screen that opens and closes facing the back surface, wherein the video projection member is located between a rear seat of the moving body and the light-shielding screen, and is arranged such that the display surface and the landscape in the traveling direction of the moving body overlap as viewed from the rear seat.

2. The display unit according to claim 1, wherein the light-shielding screen is a roll screen that winds up a sheet-shaped light-shielding member, and a winding opening of the light-shielding member is provided at a position closer to the back surface than a winding shaft of the light-shielding member.

3. The display unit according to claim 1, further comprising a stopper member standing upright facing the front seat between the front seat of the moving body and the light-shielding screen.

4. The display unit according to claim 1, wherein the light-shielding screen is a roll screen that winds up a sheet-shaped light-shielding member, the light-shielding member includes one end provided with a weight bar and the other end provided with a winding shaft, the one end faces the other end, and further comprises a bracket that detachably holds the weight bar by magnetic force in a direction along the back surface from the winding shaft.

5. The display unit according to claim 1, further comprising a control circuit, wherein the control circuit displays video content on the display surface, the video content includes a plurality of phases, and the control circuit controls the opening and closing of the light-shielding screen according to the phase displayed on the display surface.

6. The display unit according to claim 5, wherein the plurality of phases include a relaxation phase that induces a passenger in the rear seat to a relaxed state, a sleep phase that induces the passenger to a sleeping state, and a wake-up phase that induces the passenger to a waking state.

7. The stopper member is arranged such that, when the distance from the bottom surface of the front seat to the upper end of the stopper member in the vertical direction of the moving body is defined as a, the distance from the rear end of the bottom surface of the front seat to the stopper member in the traveling direction of the moving body is defined as b, the distance from the bottom surface of the front seat to the contact point between the front seat and the light-shielding screen in the vertical direction when the front seat contacts the light-shielding screen is defined as A, and the distance from the light-shielding screen to the rear end of the bottom surface of the front seat in the traveling direction is defined as B, (b / a) < (A / B) is satisfied. The display unit according to claim 3.

8. The display unit according to claim 1, further comprising a control circuit, wherein the control circuit controls the opening and closing of the light-shielding screen according to an instruction input by a passenger of the moving body.

9. A moving body provided with a display unit, wherein the display unit includes a transparent video projection member having a display surface and a back surface, and a light-shielding screen that opens and closes facing the back surface, and the video projection member is located between the rear seat of the moving body and the light-shielding screen and is arranged such that the display surface overlaps with the landscape in the traveling direction of the moving body as viewed from the rear seat. Moving body.

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