JP7504335B2 - Display System - Google Patents

Description

This disclosure relates to a display system.

Display systems that display images are known in the art. For example, Patent Document 1 discloses a system that includes a display unit and a mirror unit that reflects image light emitted from the display unit.

U.S. Pat. No. 1,068,2958

Here, when a display unit is provided behind the windshield of the vehicle, and a mirror unit is provided between the windshield and the display unit, and image light emitted from the display unit is reflected by the mirror unit, there is a problem that the image light emitted from the display unit that is not reflected by the mirror unit is emitted to the outside of the vehicle. In addition, if the mirror unit is made large so that the image light emitted from the display unit is not emitted to the outside of the vehicle, there is a problem that visibility is obstructed.

Therefore, the present disclosure provides a display system that can prevent image light from being emitted outside the vehicle while minimizing obstruction of visibility.

A display system according to one aspect of the present disclosure includes an emission section that is disposed rearward of the windshield of the vehicle in the longitudinal direction of the vehicle and has an emission surface that emits image light toward the windshield, a reflection section that is disposed between the windshield and the emission surface and has a reflection surface that reflects the image light emitted from the emission surface, and an optical section that is disposed on the windshield or between the windshield and the reflection section and has a polarizing plate that absorbs or reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface and transmits external light that is light outside the vehicle.

The display system disclosed herein can prevent image light from being emitted outside the vehicle while minimizing obstruction of visibility.

FIG. 1 is a schematic diagram showing a display system according to a first embodiment. FIG. 2 is a schematic diagram showing a display system according to the second embodiment. FIG. 3 is a schematic diagram showing a display system according to the third embodiment. FIG. 4 is a schematic diagram showing a display system according to the fourth embodiment. FIG. 5 is a block diagram showing the functional configuration of the display system of FIG. FIG. 6 is a schematic diagram showing a display system according to the fifth embodiment. FIG. 7 is a block diagram showing the functional configuration of the display system of FIG. FIG. 8 is a schematic diagram showing a display system according to the sixth embodiment. FIG. 9 is a schematic diagram showing a display system according to the seventh embodiment. FIG. 10 is a schematic diagram showing a display system according to the eighth embodiment. FIG. 11 is a schematic diagram showing a display system according to the ninth embodiment. FIG. 12 is a schematic diagram showing a display system according to a tenth embodiment. FIG. 13 is a schematic diagram showing a display system according to an eleventh embodiment. FIG. 14 is a schematic diagram showing a display system according to a twelfth embodiment. FIG. 15 is a schematic diagram showing a display system according to a thirteenth embodiment. FIG. 16 is a schematic diagram showing a display system according to a fourteenth embodiment. FIG. 17 is a schematic diagram showing a display system according to a fifteenth embodiment. FIG. 18 is a schematic diagram showing a display system according to the sixteenth embodiment. FIG. 19 is a schematic diagram showing a display system according to the seventeenth embodiment. FIG. 20 is a plan view showing a display system according to a seventeenth embodiment. FIG. 21 is a schematic diagram showing the display system according to the seventeenth embodiment in a state after the orientation of the reflecting portion has been adjusted. FIG. 22 is a top view showing the positional relationship between a reflecting portion and an emitting portion in a display system according to a seventeenth embodiment. FIG. 23 is a schematic diagram showing a display system according to the eighteenth embodiment.

A display system according to one aspect of the present disclosure includes an emission section that is disposed rearward of the windshield of the vehicle in the longitudinal direction of the vehicle and has an emission surface that emits image light toward the windshield, a reflection section that is disposed between the windshield and the emission surface and has a reflection surface that reflects the image light emitted from the emission surface, and an optical section that is disposed on the windshield or between the windshield and the reflection section and has a polarizing plate that absorbs or reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface and transmits external light that is light outside the vehicle.

According to this, the polarizing plate can absorb or reflect the image light that is emitted from the emission surface and is not reflected by the reflective surface, thereby preventing the image light from being emitted outside the vehicle. In addition, the polarizing plate can transmit external light, which is light outside the vehicle, thereby preventing obstruction of the field of vision. In this way, it is possible to prevent the image light from being emitted outside the vehicle while preventing obstruction of the field of vision.

In addition, in a display system according to one aspect of the present disclosure, the polarizing plate may be provided at least one of above a straight line passing through the upper edge of the exit surface and the upper edge of the reflector in the vertical direction of the vehicle, and below a straight line passing through the lower edge of the exit surface and the lower edge of the reflector in the vertical direction of the vehicle.

This makes it possible to more reliably prevent image light that is emitted from the exit surface, is not reflected by the reflecting surface, and passes above a straight line passing through the upper edge of the exit surface and the upper edge of the reflecting portion in the vertical direction of the vehicle from being emitted to the outside of the vehicle. Alternatively, it is possible to more reliably prevent image light that is emitted from the exit surface, is not reflected by the reflecting surface, and passes below a straight line passing through the lower edge of the exit surface and the lower edge of the reflecting portion in the vertical direction of the vehicle from being emitted to the outside of the vehicle. In this way, it is possible to more reliably prevent image light from being emitted to the outside of the vehicle while preventing obstruction of visibility.

In addition, in a display system according to one aspect of the present disclosure, the optical unit may have a λ/4 plate provided on the side of the polarizing plate opposite the reflecting unit side.

With this, the external light that would be absorbed or reflected by the polarizing plate in the absence of the λ/4 plate can be converted by the λ/4 plate so that it passes through the polarizing plate, allowing more external light to enter the interior of the vehicle. This makes it possible to further reduce obstruction of visibility while also reducing the emission of image light to the outside of the vehicle.

The display system according to one aspect of the present disclosure may also include a correction lens provided between the emission surface and the reflection surface, for transmitting the image light emitted from the emission surface toward the reflection surface and correcting an image formed by the image light reflected by the reflection surface.

This allows the image to be corrected by the correction lens even if the eye position of the person viewing the image formed by the image light reflected by the reflective surface changes.

The display system according to one aspect of the present disclosure may also include an imaging unit that images a person riding on the vehicle, a correction lens that is provided between the emission surface and the reflection surface and transmits the image light emitted from the emission surface toward the reflection surface and corrects an image formed by the image light reflected by the reflection surface, and a correction unit that corrects the image formed by the image light reflected by the reflection surface by controlling the position of the correction lens based on at least one of the head position and eye position of the person imaged by the imaging unit.

With this, even if the eye position of the person viewing the image formed by the image light reflected by the reflective surface changes, the position of the correction lens can be controlled based on at least one of the person's head position and eye position, making it easy to correct the image.

The display system according to one aspect of the present disclosure may also include an image capture unit that captures an image of a person riding on the vehicle, and a correction unit that corrects an image formed by the image light reflected by the reflecting surface by correcting an image signal that is the basis of the image light based on at least one of the head position and eye position of the person captured by the image capture unit.

With this, even if the eye position of a person viewing an image formed by image light reflected from a reflective surface changes, the image signal on which the image light is based can be corrected based on at least one of the person's head position and eye position, making it easy to correct the image.

In addition, in a display system according to one aspect of the present disclosure, the emission surface and the reflection surface may be provided on the driver's seat side of the vehicle rather than the center of the vehicle in the left-right direction of the vehicle.

This makes it possible to reduce the optical path difference in the left and right directions when viewed from the driver's seat, thereby preventing distortion in the image formed by the image light reflected by the reflective surface.

In addition, in a display system according to one aspect of the present disclosure, the emission surface and the reflection surface may be arranged such that, when viewed from above or below the vehicle, a straight line passing through the center of the emission surface and the center of the reflection surface passes through the head of a person riding on the vehicle.

This makes it possible to reduce the optical path difference in the left-right direction when viewed from a person riding in the vehicle, thereby preventing distortion in the image formed by the image light reflected by the reflective surface.

In addition, in a display system according to one aspect of the present disclosure, the polarizing plate may not be provided in at least a portion of the windshield that overlaps with the reflecting portion in the direction in which the exit surface and the reflecting surface are aligned.

As a result, the image light emitted from the exit surface is unlikely to strike the portion of the windshield that overlaps with the reflecting portion in the direction in which the exit surface and reflecting surface are aligned. By not providing a polarizing plate in at least some of the portions that are unlikely to be struck by the image light emitted from the exit surface, it is possible to suppress an increase in costs associated with the polarizing plate while preventing obstruction of visibility and preventing the image light from being emitted outside the vehicle.

The display system according to one aspect of the present disclosure may also include a louver film disposed between the exit surface and the reflecting surface, which passes the image light emitted from the exit surface in a direction toward the reflecting surface, and blocks the image light emitted in a direction toward a lower side in the vertical direction of the vehicle than the direction from the exit surface toward the reflecting surface.

This allows the louver film to block image light emitted in a direction toward the lower side of the vehicle's vertical direction rather than from the emission surface toward the reflection surface, thereby further reducing obstruction to visibility while preventing image light from being emitted outside the vehicle.

The display system according to one aspect of the present disclosure may also include a blocking section that blocks the image light emitted in a direction toward a lower side in the vertical direction of the vehicle than the direction from the emission surface toward the reflection surface.

This allows the blocking portion to block image light emitted in a direction toward the lower side in the vertical direction of the vehicle rather than from the emission surface toward the reflection surface, thereby further reducing obstruction to visibility while preventing the image light from being emitted outside the vehicle.

The display system according to one aspect of the present disclosure may further include a λ/4 plate provided between the exit surface and the reflecting surface, and the optical unit may include a λ/4 plate provided on the reflecting surface side of the polarizing plate.

This allows the external light to be circularly polarized and emitted into the interior of the vehicle, further reducing obstruction to visibility while preventing image light from being emitted outside the vehicle.

In addition, in a display system according to one aspect of the present disclosure, the polarizing plate may be a reflective polarizing plate that reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface.

This prevents the polarizing plate from absorbing image light and generating heat, thereby preventing deterioration of the polarizing plate due to heat generation.

In addition, in a display system according to one aspect of the present disclosure, the reflecting surface may be a concave curved surface, and the exit surface may be arranged to be parallel to a tangent at the center of the reflecting surface.

This makes it possible to make the distance between the emission surface and the reflection surface more uniform, thereby reducing distortion in the image formed by the image light reflected by the reflection surface.

In addition, in a display system according to one aspect of the present disclosure, the reflecting surface may be a concave curved surface, the tangent at the center of the reflecting surface may be inclined with respect to the vertical direction of the vehicle, and the exit surface may be inclined with respect to the vertical direction of the vehicle more than the tangent.

This allows the distance between one end of the exit surface and the other end of the reflecting surface to be smaller than the distance between one end of the exit surface and one end of the reflecting surface, making it possible to display the image formed by the image light reflected by the reflecting surface in a more three-dimensional manner.

In addition, in a display system according to one aspect of the present disclosure, the polarizing plate may be a reflective polarizing plate that reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface, the reflection surface may be a concave curved surface, and the tangent at the center of the reflection surface may be inclined with respect to the vertical direction of the vehicle, and the windshield may be inclined with respect to the vertical direction of the vehicle more than the tangent.

This makes it easier for the polarizing plate to reflect image light that is emitted from the exit surface and is not reflected by the reflecting surface downward, preventing the image light reflected by the polarizing plate from being seen by people in the vehicle.

In addition, a display system according to one aspect of the present disclosure may include a holding section that rotatably holds the reflecting section, and the reflecting surface may include a first reflecting surface and a second reflecting surface that are arranged back to back with each other, and a polarizing sheet that does not directly reflect the external light that has passed through the polarizing plate may be laminated on the first reflecting surface and the second reflecting surface.

According to this, the holding part holds the reflecting part rotatably, so that the reflecting part can be easily rotated. Here, the reflecting part is provided with a first reflecting surface and a second reflecting surface facing away from each other, so that the first reflecting surface or the second reflecting surface can be directed toward a person riding in the vehicle by rotating it. Both the first reflecting surface and the second reflecting surface are laminated with a polarizing sheet that does not directly reflect the external light transmitted through the polarizing plate. For example, when the first reflecting surface faces a person, the second reflecting surface faces the windshield, and in this case, the external light transmitted through the polarizing plate can be reflected by the second reflecting surface. However, the second reflecting surface is laminated with a polarizing sheet that does not directly reflect the external light transmitted through the polarizing plate. If the polarizing sheet has optical properties that absorb the external light transmitted through the polarizing plate, the external light is absorbed by the polarizing sheet and is not reflected. Also, when the polarizing sheet is a λ/4 plate, the external light transmitted through the polarizing plate is reflected by the second reflecting surface after transmitting through the λ/4 plate, and then transmitted through the λ/4 plate again toward the polarizing plate. In this way, the external light passes through the λ/4 plate twice, and becomes polarized light that is absorbed by the polarizing plate. In other words, even in this case, the light (external light) reflected by the second reflecting surface is absorbed by the polarizing plate and is not emitted outside the windshield. In this way, even in a configuration in which the first and second reflecting surfaces are switched, the reflecting surface facing the windshield can be prevented from reflecting external light outside the vehicle.

In addition, in a display system according to one aspect of the present disclosure, the reflecting section and the emitting section may be aligned in the front-to-rear direction.

With this, the rotating reflector and the emitter are aligned in the front-to-rear direction, so that by simply flipping the reflector, the image light from the emitter and the rear reflected image of the vehicle can be directed toward the person riding in the vehicle.

In addition, in a display system according to one aspect of the present disclosure, the optical unit may be supported by a translucent carrier provided between the windshield and the reflector.

With this, the optical unit is supported by a light-transmitting carrier provided between the windshield and the reflector, so the optical unit can be positioned closer to the emission unit than the windshield. In other words, the optical unit can block image light before it reaches the windshield. For example, if the optical unit provided on the windshield and the optical unit provided on the carrier have the same bottom end position, the optical unit provided on the carrier can block light over a wider range.

In addition, in a display system according to one aspect of the present disclosure, the optical unit may have a gradient in the up-down direction in the absorptance of the image light or the transmittance of the external light.

As a result, the optical section has a gradient in the up-down direction in the absorption rate of image light or the transmittance of external light, so that sudden changes in the amount of light can be suppressed.

In addition, in a display system according to one aspect of the present disclosure, the optical unit may be provided on the windshield.

With this, the optical unit is provided on the windshield, so the windshield and the optical unit can be integrated, resulting in a simple structure.

The embodiments described below each show a specific example of the present disclosure. The numerical values, shapes, materials, components, component placement and connection forms, steps, and order of steps 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 are described as optional components.

In the following embodiments, expressions such as "parallel" and "orthogonal" may be used to indicate the relative position of two directions, but these expressions also include cases where the position is not strictly that one. For example, when two directions are said to be parallel, unless otherwise specified, it does not only mean that the two directions are completely parallel, but also that they are substantially parallel, that is, that is, they include a difference of, for example, about a few percent.

The optical paths illustrated in the figures in the following embodiments are intended to illustrate the fundamental concepts and do not necessarily reflect the actual optical paths.

(First embodiment)
Fig. 1 is a schematic diagram showing a display system 10 according to a first embodiment. Fig. 1 shows the display system 10 as viewed from the left side in the left-right direction of a vehicle 1. Note that Fig. 1 shows a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1 in cross section.

The display system 10 is a system that displays an image. The display system 10 is mounted on a vehicle 1. The vehicle 1 has a windshield 2 and a ceiling 3. The windshield 2 is sometimes called a front window or a windshield. For example, the vehicle 1 is a vehicle, a ship, an aircraft, or the like. For example, the vehicle is an automobile, or the like. As shown in FIG. 1, the display system 10 includes an emission unit 20, a reflection unit 30, and an optical unit 40.

The emission unit 20 emits image light that forms an image. The emission unit 20 is a display device that displays an image by emitting image light. For example, the image is an image captured by a capture unit (not shown). For example, the capture unit is a camera that captures the rear of the vehicle 1. Note that, for example, the image may be an image that indicates the vehicle speed of the vehicle 1, the detection result of an object close to the vehicle 1, or navigation information from the current location of the vehicle 1 to the destination. In this embodiment, the emission unit 20 is attached to the ceiling 3. For example, the emission unit 20 is realized by including an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence) display, or a micro LED (Light Emitting Diode) display. The emission unit 20 has an emission surface 21.

The exit surface 21 is a surface that emits image light. In other words, the exit surface 21 is a surface on which the image in the exit unit 20 is displayed. The exit surface 21 is provided behind the windshield 2 of the vehicle 1 in the longitudinal direction of the vehicle 1. In this embodiment, the exit surface 21 is provided behind the windshield 2 in the longitudinal direction of the vehicle 1, and overlaps with the windshield 2 in the longitudinal direction of the vehicle 1. The exit surface 21 emits image light toward the windshield 2 side (see the thick solid arrow and the thick dashed arrow in FIG. 1). In this embodiment, the exit surface 21 is a plane, is parallel to each of the vertical and horizontal directions of the vehicle 1, and is provided so as to face the front side in the longitudinal direction of the vehicle 1. For example, the exit surface 21 may be inclined with respect to the vertical direction of the vehicle 1, or may be inclined with respect to the horizontal direction of the vehicle 1. For example, the emission unit 20 is configured so that polarized image light that vibrates in a predetermined direction is emitted from the emission surface 21. That is, for example, the image light emitted from the emission surface 21 is polarized light that vibrates in a predetermined direction. Specifically, for example, the image light emitted from the emission surface 21 is P-polarized light.

The reflecting unit 30 reflects the image light emitted from the emission surface 21. The reflecting unit 30 includes a mirror and the like. In this embodiment, the reflecting unit 30 is a concave mirror. Note that, for example, the reflecting unit 30 does not have to be a concave mirror and may be a flat mirror or the like. The reflecting unit 30 has a reflecting surface 31.

The reflecting surface 31 is a surface that reflects the image light emitted from the exit surface 21. For example, the reflecting surface 31 is a mirror surface. The reflecting surface 31 is provided between the windshield 2 and the exit surface 21. The reflecting surface 31 is provided behind the windshield 2 of the vehicle 1 in the longitudinal direction of the vehicle 1. In this embodiment, the reflecting surface 31 is provided behind the windshield 2 in the longitudinal direction of the vehicle 1 and overlaps with the windshield 2 in the longitudinal direction of the vehicle 1. In this embodiment, at least a portion of the reflecting surface 31 is provided so as to be located at the same position as at least a portion of the exit surface 21 in the vertical direction of the vehicle 1, and reflects the image light emitted from the exit surface 21 toward the lower side in the vertical direction of the vehicle 1 (see the thick solid arrow in FIG. 1). In this embodiment, the reflecting surface 31 is a concave curved surface, and is provided so that the tangent L1 at the center of the reflecting surface 31 is inclined with respect to the vertical direction of the vehicle 1. Tangent line L1 is a tangent line that touches reflecting surface 31 at the center of reflecting surface 31. In this embodiment, tangent line L1 is inclined so as to be located on the side of exit surface 21 as it moves upward in the vertical direction of vehicle 1. In this embodiment, tangent line L1 is perpendicular to the left-right direction of vehicle 1. Note that, for example, tangent line L1 does not have to be perpendicular to the left-right direction of vehicle 1. Also, for example, reflecting surface 31 does not have to be a concave curved surface and may be a flat surface. In this case, for example, reflecting surface 31 may be inclined so as to be located on the side of exit surface 21 as it moves upward in the vertical direction of vehicle 1.

The optical unit 40 is provided on the windshield 2. The optical unit 40 has a polarizing plate 41.

The polarizing plate 41 absorbs or reflects the image light that is emitted from the exit surface 21 and is not reflected by the reflecting surface 31, and transmits external light that is light outside the vehicle 1. For example, the polarizing plate 41 is a transmissive polarizing plate that transmits light that vibrates in a direction different from the vibration direction of the image light emitted from the exit surface 21. For example, when P-polarized image light is emitted from the exit surface 21, the polarizing plate 41 is a transmissive polarizing plate that transmits S-polarized light. In this case, the polarizing plate 41 can absorb the P-polarized image light emitted from the exit surface 21 (see the thick dashed arrow in FIG. 1) and transmit the S-polarized external light (see the thick dashed arrow in FIG. 1). In this way, the polarizing plate 41 absorbs the image light that is emitted from the exit surface 21 and is not reflected by the reflecting surface 31, and transmits polarized light that vibrates in a direction different from the image light among the external light. For example, the polarizing plate 41 may be a polarizing plate that reflects image light that is emitted from the emission surface 21 and is not reflected by the reflection surface 31, and transmits polarized light of external light that vibrates in a direction different from that of the image light. In this embodiment, the polarizing plate 41 is bonded to the surface of the windshield 2 facing the interior of the vehicle 1. For example, the polarizing plate 41 may be bonded to the surface of the windshield 2 facing the exterior of the vehicle 1. In this embodiment, the polarizing plate 41 is provided above a straight line L2 that passes through the upper edge of the emission surface 21 and the upper edge of the reflection section 30 in the vertical direction of the vehicle 1, and is provided below a straight line L3 that passes through the lower edge of the emission surface 21 and the lower edge of the reflection section 30 in the vertical direction of the vehicle 1. For example, the polarizing plate 41 may be provided to the left of a straight line passing through the left edge of the exit surface 21 and the left edge of the reflecting portion 30 in the left-right direction of the vehicle 1, or may be provided to the right of a straight line passing through the right edge of the exit surface 21 and the right edge of the reflecting portion 30 in the left-right direction of the vehicle 1. For example, the range in which components can be installed in the windshield 2 is determined by law, and the optical unit 40 (polarizing plate 41) is provided within the legal range in the windshield 2. For example, if the law determines that the range in which components can be installed in the windshield 2 is within 20% of the upper edge of the windshield 2, the optical unit 40 (polarizing plate 41) is provided within 20% of the upper edge of the windshield 2. For example, if the law determines that the range in which components can be installed in the windshield 2 is within 4 inches of the upper edge of the windshield 2, the optical unit 40 (polarizing plate 41) is provided within 4 inches of the upper edge of the windshield 2.

Here, it is preferable that the polarizing plate 41 of the optical unit 40 has a gradient in the absorption rate of image light or the transmittance of external light in the vertical direction. Specifically, the polarizing plate 41 has a gradation such that the absorption rate gradually decreases or the transmittance gradually increases toward the bottom. It is preferable that a transmittance of 70% is ensured in the region 20% below the upper edge of the windshield 2. This makes it possible to suppress sudden changes in the amount of light, making the boundary portion of the polarizing plate 41 less noticeable.

The display system 10 according to the first embodiment includes an emission unit 20 that is provided behind the windshield 2 of the vehicle 1 in the longitudinal direction of the vehicle 1 and has an emission surface 21 that emits image light toward the windshield 2, a reflection unit 30 that is provided between the windshield 2 and the emission surface 21 and has a reflection surface 31 that reflects the image light emitted from the emission surface 21, and an optical unit 40 that is provided on the windshield 2 and has a polarizing plate 41 that absorbs or reflects the image light that is emitted from the emission surface 21 and is not reflected by the reflection surface 31 and transmits external light that is light outside the vehicle 1.

As a result, the polarizing plate 41 can absorb or reflect image light that is emitted from the emission surface 21 and is not reflected by the reflection surface 31, thereby preventing the image light from being emitted outside the vehicle 1. In addition, the polarizing plate 41 can transmit external light, which is light outside the vehicle 1, thereby preventing obstruction of visibility. In this way, it is possible to prevent the image light from being emitted outside the vehicle 1 while preventing obstruction of visibility.

In addition, in the display system 10 according to the first embodiment, the polarizing plate 41 is provided above a straight line L2 that passes through the upper edge of the exit surface 21 and the upper edge of the reflector 30 in the vertical direction of the vehicle 1, and is provided below a straight line L3 that passes through the lower edge of the exit surface 21 and the lower edge of the reflector 30 in the vertical direction of the vehicle 1.

This makes it possible to more reliably prevent image light that is emitted from the exit surface 21, is not reflected by the reflecting surface 31, and passes above the straight line L2 that passes through the upper edge of the exit surface 21 and the upper edge of the reflecting section 30 in the vertical direction of the vehicle 1, from being emitted to the outside of the vehicle 1. Also, it is possible to more reliably prevent image light that is emitted from the exit surface 21, is not reflected by the reflecting surface 31, and passes below the straight line L3 that passes through the lower edge of the exit surface 21 and the lower edge of the reflecting section 30 in the vertical direction of the vehicle 1, from being emitted to the outside of the vehicle 1. In this way, it is possible to more reliably prevent image light from being emitted to the outside of the vehicle 1 while preventing obstruction of visibility.

In addition, in the display system 10 according to the first embodiment, the polarizing plate 41 of the optical unit 40 has a gradient in the up-down direction in the absorption rate of image light or the transmittance of external light.

As a result, the polarizing plate 41 has a gradient in the absorption rate of image light or the transmittance of external light in the vertical direction, so that sudden changes in the amount of light can be suppressed.

In addition, in the display system 10 according to the first embodiment, the optical unit 40 is provided in the windshield 2.

As a result, the optical unit 40 is provided on the windshield 2, so the windshield 2 and the optical unit 40 can be integrated, resulting in a simple structure.

The polarizing plate 41 may be provided above the straight line L2 passing through the upper edge of the exit surface 21 and the upper edge of the reflector 30 in the vertical direction of the vehicle 1, and above the straight line L3 passing through the lower edge of the exit surface 21 and the lower edge of the reflector 30 in the vertical direction of the vehicle 1. Furthermore, the polarizing plate 41 may be provided below the straight line L2 passing through the upper edge of the exit surface 21 and the upper edge of the reflector 30 in the vertical direction of the vehicle 1, and below the straight line L3 passing through the lower edge of the exit surface 21 and the lower edge of the reflector 30 in the vertical direction of the vehicle 1.

Second Embodiment
Fig. 2 is a schematic diagram showing a display system 10a according to a second embodiment. Fig. 2 shows the display system 10a as viewed from the left side in the left-right direction of the vehicle 1. In Fig. 2, a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1 are shown in cross section.

As shown in FIG. 2, display system 10a differs from display system 10 mainly in that display system 10a includes optical unit 40a instead of optical unit 40. The following mainly describes the differences from display system 10.

Optical section 40a differs from optical section 40 primarily in that it further includes a λ/4 plate 42.

The λ/4 plate 42 is provided on the opposite side of the polarizing plate 41 from the reflecting portion 30 side. In this embodiment, the λ/4 plate 42 is provided between the polarizing plate 41 and the windshield 2. In this embodiment, the λ/4 plate 42 is adhered to the surface of the windshield 2 facing the interior of the vehicle 1, and the polarizing plate 41 is adhered to the λ/4 plate 42 so as to overlap with the λ/4 plate 42. The λ/4 plate 42 converts P-polarized light into circularly polarized light, S-polarized light into circularly polarized light, and circularly polarized light into P-polarized light or S-polarized light. For example, P-polarized external light is circularly polarized after entering the λ/4 plate 42 and is emitted from the λ/4 plate 42, and the polarizing plate 41 transmits only polarized light (for example, S-polarized light) that vibrates in a predetermined direction among the circularly polarized light emitted from the λ/4 plate 42. In addition, the S-polarized external light enters the λ/4 plate 42, becomes circularly polarized light, and is emitted from the λ/4 plate 42. The polarizing plate 41 transmits only the circularly polarized light that vibrates in a specific direction (for example, S-polarized light) emitted from the λ/4 plate 42.

In the display system 10a according to the second embodiment, the optical unit 40a has a λ/4 plate 42 provided on the side of the polarizing plate 41 opposite the reflecting unit 30.

With this, the external light that would be absorbed or reflected by the polarizing plate 41 in the absence of the λ/4 plate 42 can be converted by the λ/4 plate 42 to pass through the polarizing plate 41, allowing more external light to enter the interior of the vehicle 1. Therefore, it is possible to further reduce obstruction of visibility while suppressing the emission of image light to the outside of the vehicle 1.

Third Embodiment
Fig. 3 is a schematic diagram showing a display system 10b according to a third embodiment. Fig. 3 shows the display system 10b as viewed from the left side in the left-right direction of the vehicle 1. In Fig. 3, a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1 are shown in cross section.

As shown in FIG. 3, display system 10b differs from display system 10 primarily in that it further includes a correction lens 50. The following will focus on the differences from display system 10.

The correction lens 50 is a lens for correcting an image formed by the image light reflected by the reflecting surface 31. The correction lens 50 is provided between the exit surface 21 and the reflecting surface 31, and transmits the image light emitted from the exit surface 21 toward the reflecting surface 31. For example, the correction lens 50 is attached to the ceiling 3 so as to be displaceable with respect to the exit unit 20 and the reflecting unit 30. For example, depending on the position of the eyes of a person viewing an image formed by the image light reflected by the reflecting surface 31, the image may be distorted. In this case, the person can change the position of the correction lens 50 to change the direction in which the image light transmitted through the correction lens 50 travels, and can correct the distortion and display position of the image formed by the image light emitted from the exit surface 21 and reflected by the reflecting surface 31. In this embodiment, the correction lens 50 is a double-sided free-form lens. Note that, for example, the correction lens 50 may be a convex lens or a concave lens.

The display system 10b according to the third embodiment includes a correction lens 50 disposed between the emission surface 21 and the reflection surface 31, which transmits the image light emitted from the emission surface 21 toward the reflection surface 31 and corrects the image formed by the image light reflected by the reflection surface 31.

As a result, the image can be corrected by the correction lens 50 even if the eye position of the person viewing the image formed by the image light reflected by the reflecting surface 31 changes.

(Fourth embodiment)
Fig. 4 is a schematic diagram showing a display system 10c according to a fourth embodiment. Fig. 4 shows the display system 10c as viewed from the left side in the left-right direction of the vehicle 1. Fig. 4 shows a cross section of the windshield 2 and the ceiling 3 of the vehicle 1. Fig. 5 is a block diagram showing the functional configuration of the display system 10c of Fig. 4.

As shown in Figures 4 and 5, display system 10c differs from display system 10b mainly in that display system 10c further includes an imaging unit 60, a correction unit 70, and an actuator 80. The following mainly describes the differences from display system 10b.

The imaging unit 60 captures an image of a person riding in the vehicle 1. For example, the person riding in the vehicle 1 is the driver of the vehicle 1. The imaging unit 60 is provided in a position where it can capture an image of the head of the person riding in the vehicle 1 and at least one of the eyes of the person. For example, the imaging unit 60 is a camera.

The correction unit 70 corrects the image formed by the image light reflected by the reflecting surface 31 by controlling the position of the correction lens 50 based on at least one of the head position and eye position of the person photographed by the photographing unit 60. For example, when the position of at least one of the head and eyes of the person photographed by the photographing unit 60 moves downward, the correction unit 70 corrects the image formed by the image light reflected by the reflecting surface 31 by controlling the position of the correction lens 50 so that the lower end of the correction lens 50 approaches the exit surface 21. Also, for example, when the position of at least one of the head and eyes of the person photographed by the photographing unit 60 moves upward, the correction unit 70 corrects the image formed by the image light reflected by the reflecting surface 31 by controlling the position of the correction lens 50 so that the upper end of the correction lens 50 approaches the exit surface 21. Also, for example, when the position of at least one of the head and eyes of the person photographed by the photographing unit 60 moves to the right, the correction unit 70 controls the position of the correction lens 50 to move the horizontal position of the correction lens 50 to the right, thereby correcting the image formed by the image light reflected by the reflecting surface 31. Also, for example, when the position of at least one of the head and eyes of the person photographed by the photographing unit 60 moves to the left, the correction unit 70 controls the position of the correction lens 50 to move the horizontal position of the correction lens 50 to the left, thereby correcting the image formed by the image light reflected by the reflecting surface 31. In this embodiment, the correction unit 70 is electrically connected to the actuator 80, and controls the position of the correction lens 50 by driving the actuator 80. For example, the correction unit 70 is realized by a processor that executes a program.

The actuator 80 displaces the correction lens 50 by being driven. For example, the actuator 80 is an electric actuator and is mechanically connected to the correction lens 50.

The display system 10c according to the fourth embodiment includes an image capturing unit 60 that captures an image of a person riding on the vehicle 1, a correction lens 50 that is provided between the emission surface 21 and the reflection surface 31 and transmits the image light emitted from the emission surface 21 toward the reflection surface 31 and corrects the image formed by the image light reflected by the reflection surface 31, and a correction unit 70 that corrects the image formed by the image light reflected by the reflection surface 31 by controlling the position of the correction lens 50 based on at least one of the head position and eye position of the person captured by the image capturing unit 60.

As a result, even if the eye position of the person viewing the image formed by the image light reflected by the reflecting surface 31 changes, the position of the correction lens 50 can be controlled based on at least one of the head position and eye position of the person, making it easy to correct the image.

Fifth embodiment
Fig. 6 is a schematic diagram showing a display system 10d according to a fifth embodiment. Fig. 6 shows the display system 10d as viewed from the left side in the left-right direction of the vehicle 1. Fig. 6 also shows a cross section of the windshield 2 and the ceiling 3 of the vehicle 1. Fig. 7 is a block diagram showing the functional configuration of the display system 10d of Fig. 6.

As shown in Figures 6 and 7, display system 10d differs from display system 10 mainly in that it further includes an imaging unit 60 and a correction unit 70. The following will focus on the differences from display system 10.

For the imaging unit 60, please refer to the explanation in the fourth embodiment described above, and a detailed explanation will be omitted here.

The correction unit 70 corrects the image formed by the image light reflected by the reflecting surface 31 by correcting the image signal on which the image light is based based on at least one of the head position and eye position of the person photographed by the photographing unit 60. For example, when the position of at least one of the head and eyes of the person photographed by the photographing unit 60 moves downward, the correction unit 70 corrects the image formed by the image light reflected by the reflecting surface 31 by correcting the image signal so as to display the upper side in the image displayed on the exit surface 21 larger. Also, for example, when the position of at least one of the head and eyes of the person photographed by the photographing unit 60 moves upward, the correction unit 70 corrects the image formed by the image light reflected by the reflecting surface 31 by correcting the image signal so as to display the lower side in the image displayed on the exit surface 21 larger. Also, for example, when the position of at least one of the head and eyes of the person photographed by the photographing unit 60 moves to the right, the correction unit 70 corrects the image formed by the image light reflected by the reflecting surface 31 by correcting the image signal so as to display the left side in the image displayed on the exit surface 21 larger. Furthermore, for example, when the position of at least one of the head and eyes of the person photographed by the photographing unit 60 moves to the left, the correction unit 70 corrects the image formed by the image light reflected by the reflecting surface 31 by correcting the image signal so that the right side of the image displayed on the emission surface 21 is displayed larger. In this embodiment, the correction unit 70 is electrically connected to the emission unit 20 and corrects the image signal by controlling the emission unit 20. For example, the correction unit 70 is realized by a processor that executes a program, etc.

The display system 10d according to the fifth embodiment includes an image capturing unit 60 that captures an image of a person riding on a vehicle 1, and a correction unit 70 that corrects an image formed by the image light reflected by the reflecting surface 31 by correcting an image signal that is the basis of the image light based on at least one of the head position and eye position of the person captured by the image capturing unit 60.

As a result, even if the direction of at least one of the head position and eye position of a person viewing an image formed by the image light reflected by the reflecting surface 31 changes, the image signal on which the image light is based can be corrected based on at least one of the head position and eye position of the person, making it easy to correct the image.

Sixth embodiment
8 is a schematic diagram showing a display system 10e according to a sixth embodiment of the present invention, as viewed from above the vehicle 1 in the vertical direction.

8, in the display system 10e, the exit surface 21 and the reflection surface 31 are provided on the driver's seat side of the vehicle 1 from the center of the vehicle 1 in the left-right direction of the vehicle 1. When the center line of the vehicle 1 in the left-right direction of the vehicle 1 is the center line L4, the driver's seat, the exit surface 21, and the reflection surface 31 of the vehicle 1 are provided on one side of the center line L4 in the left-right direction of the vehicle 1. In addition, the exit surface 21 and the reflection surface 31 are provided so that, when viewed from the top-bottom direction of the vehicle 1, a straight line L5 passing through the center of the exit surface 21 and the center of the reflection surface 31 passes through the head 4 of a person riding in the vehicle 1. For example, the position of the head 4 is the designed position of the head 4. For example, the straight line L5 may be provided so as to pass through the center of the head 4 of a person riding in the vehicle 1 when viewed from the top-bottom direction of the vehicle 1. In this embodiment, the straight line L5 is parallel to the front-rear direction of the vehicle 1 when viewed from the top-bottom direction of the vehicle 1.

In the display system 10e according to the sixth embodiment, the emission surface 21 and the reflection surface 31 are provided on the driver's seat side of the vehicle 1 rather than the center of the vehicle 1 in the left-right direction of the vehicle 1.

This makes it possible to reduce the optical path difference in the left-right direction when viewed from the driver's seat, thereby preventing distortion in the image formed by the image light reflected by the reflecting surface 31.

In addition, in the display system 10e according to the sixth embodiment, the exit surface 21 and the reflecting surface 31 are arranged so that, when viewed from above or below the vehicle 1, a straight line L5 passing through the center of the exit surface 21 and the center of the reflecting surface 31 passes through the head 4 of a person riding on the vehicle 1.

This makes it possible to reduce the optical path difference in the left-right direction when viewed from a person riding on the vehicle 1, thereby suppressing distortion of the image formed by the image light reflected by the reflecting surface 31.

Seventh embodiment
9 is a schematic diagram showing a display system 10f according to a seventh embodiment of the present invention, as viewed from above the vehicle 1 in the vertical direction.

9, in the display system 10f, the exit surface 21 and the reflection surface 31 are provided on the driver's seat side of the vehicle 1 from the center of the vehicle 1 in the left-right direction of the vehicle 1. When the center line of the vehicle 1 in the left-right direction of the vehicle 1 is the center line L4, the driver's seat, the exit surface 21, and the reflection surface 31 of the vehicle 1 are provided on one side of the center line L4 in the left-right direction of the vehicle 1. In addition, the exit surface 21 and the reflection surface 31 are provided so that, when viewed from the top-bottom direction of the vehicle 1, a straight line L5 passing through the center of the exit surface 21 and the center of the reflection surface 31 passes through the head 4 of a person riding in the vehicle 1. For example, the position of the head 4 is the designed position of the head 4. In this embodiment, the straight line L5 is provided so that, when viewed from the top-bottom direction of the vehicle 1, it passes through the center of the head 4 of a person riding in the vehicle 1. In this embodiment, the straight line L5 is inclined with respect to the front-rear direction of the vehicle 1 when viewed from the top-bottom direction of the vehicle 1.

In the display system 10f according to the seventh embodiment, the emission surface 21 and the reflection surface 31 are provided on the driver's seat side of the vehicle 1 rather than the center of the vehicle 1 in the left-right direction of the vehicle 1.

This makes it possible to reduce the optical path difference in the left-right direction when viewed from the driver's seat, thereby preventing distortion in the image formed by the image light reflected by the reflecting surface 31.

In addition, in the display system 10f according to the seventh embodiment, the exit surface 21 and the reflecting surface 31 are arranged so that, when viewed from above or below the vehicle 1, a straight line L5 passing through the center of the exit surface 21 and the center of the reflecting surface 31 passes through the head 4 of a person riding on the vehicle 1.

This makes it possible to reduce the optical path difference in the left-right direction when viewed from a person riding on the vehicle 1, thereby suppressing distortion of the image formed by the image light reflected by the reflecting surface 31.

Eighth embodiment
Fig. 10 is a schematic diagram showing a display system 10g according to an eighth embodiment. Fig. 10 shows a display system 10a as viewed from the left side in the left-right direction of a vehicle 1. Note that Fig. 10 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 10, display system 10g differs from display system 10 mainly in that display system 10g includes optical unit 40g instead of optical unit 40. The following will focus on the differences from display system 10.

Optical unit 40g differs from optical unit 40 mainly in that it has polarizing plate 41g instead of polarizing plate 41.

The polarizing plate 41g is not provided on at least a portion of the portion 5 of the windshield 2 that overlaps with the reflecting portion 30 in the direction D in which the exit surface 21 and the reflecting surface 31 are aligned. The portion 5 is the portion of the surface of the windshield 2 facing the interior of the vehicle 1 that overlaps with the reflecting portion 30 when viewed from the direction D.

In the display system 10g according to the eighth embodiment, the polarizing plate 41g is not provided in at least a portion of the portion 5 of the windshield 2 that overlaps with the reflecting section 30 in the direction D in which the exit surface 21 and the reflecting surface 31 are aligned.

As a result, the image light emitted from the exit surface 21 is unlikely to strike the portion 5 that overlaps with the reflecting portion 30 in the direction D in which the exit surface 21 and the reflecting surface 31 of the windshield 2 are aligned. By not providing a polarizing plate 41g in at least a portion of the portion 5 that is unlikely to be struck by the image light emitted from the exit surface 21 in this manner, it is possible to suppress an increase in the cost associated with the polarizing plate 41g while suppressing obstruction of visibility and the emission of the image light to the outside of the vehicle 1.

Ninth embodiment
Fig. 11 is a schematic diagram showing a display system 10h according to a ninth embodiment. Fig. 11 shows the display system 10h as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 11 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 11, display system 10h differs from display system 10 mainly in that it further includes a louver film 90. The following will focus on the differences from display system 10.

The louver film 90 is provided between the exit surface 21 and the reflecting surface 31, and passes image light emitted from the exit surface 21 in the direction toward the reflecting surface 31, and blocks image light emitted in a direction toward the lower side in the vertical direction of the vehicle 1 than the direction from the exit surface 21 toward the reflecting surface 31. The direction from the exit surface 21 toward the reflecting surface 31 is the direction D from the exit surface 21 toward the reflecting surface 31. For example, the louver film 90 is configured to include a plurality of plate members each parallel to the direction D and arranged in a direction perpendicular to the direction D. In this embodiment, the louver film 90 is adhered to the exit surface 21. For example, the louver film 90 may be provided with a gap between the exit surface 21 and the louver film 90.

The display system 10h according to the ninth embodiment includes a louver film 90 that is provided between the exit surface 21 and the reflecting surface 31, and that passes image light emitted from the exit surface 21 in a direction toward the reflecting surface 31, and blocks image light emitted in a direction toward a lower side in the vertical direction of the vehicle 1 than the direction from the exit surface 21 toward the reflecting surface 31.

As a result, the louver film 90 can block image light emitted in a direction toward the lower side in the vertical direction of the vehicle 1 rather than the direction from the emission surface 21 toward the reflection surface 31, thereby further reducing obstruction of visibility while preventing the image light from being emitted outside the vehicle 1.

Tenth embodiment
Fig. 12 is a schematic diagram showing a display system 10i according to a tenth embodiment. Fig. 12 shows the display system 10i as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 12 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 12, display system 10i differs from display system 10 mainly in that display system 10i further includes blocking unit 100 and blocking unit 110. The following mainly describes the differences from display system 10.

The blocking unit 100 blocks image light emitted in a direction toward the lower side in the vertical direction of the vehicle 1, relative to the direction from the exit surface 21 toward the reflecting surface 31 (see the thick dashed double-dashed arrow in FIG. 12). The direction from the exit surface 21 toward the reflecting surface 31 is the direction D from the exit surface 21 toward the reflecting surface 31. The blocking unit 100 is provided in the exit surface 20. The blocking unit 100 is plate-shaped and provided parallel to the direction D. The blocking unit 100 is provided so as to protrude from the exit surface 20 toward the reflecting unit 30 below the exit surface 21. For example, the blocking unit 100 is adhered to the exit surface 20 by an adhesive or the like.

The blocking section 110 blocks image light emitted in a direction toward the right side in the left-right direction of the vehicle 1, relative to the direction from the exit surface 21 toward the reflecting surface 31. The blocking section 110 is provided in the exit surface 20. The blocking section 110 is plate-shaped and provided parallel to the direction D and perpendicular to the blocking section 100. The blocking section 110 is provided so as to protrude from the exit surface 21 to the reflecting section 30 side, to the right of the exit surface 21. For example, the blocking section 110 is adhered to the exit surface 20 with an adhesive or the like.

For example, the display system 10i may include a blocking section that blocks image light emitted in a direction toward the left side of the vehicle 1 in the left-right direction, rather than the direction from the emission surface 21 toward the reflection surface 31.

The display system 10i according to the tenth embodiment includes a blocking unit 100 that blocks image light emitted in a direction toward the lower side in the vertical direction of the vehicle 1, rather than the direction from the emission surface 21 toward the reflection surface 31.

This allows the blocking section 100 to block image light emitted in a direction toward the lower side in the vertical direction of the vehicle 1 rather than the direction from the emission surface 21 toward the reflection surface 31, thereby further reducing obstruction of visibility while preventing the image light from being emitted outside the vehicle 1.

Eleventh embodiment
Fig. 13 is a schematic diagram showing a display system 10j according to an eleventh embodiment. Fig. 13 shows the display system 10j as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 13 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 13, display system 10j differs from display system 10 primarily in that it further includes a blocking portion 100 and a support member 120. The following will focus on the differences from display system 10.

For the blocking unit 100, please refer to the explanation in the 10th embodiment described above, and a detailed explanation will be omitted here.

The support member 120 is a member that supports the blocking unit 100. The support member 120 is connected to the upper end of the emission unit 20 and the end of the blocking unit 100 opposite the emission unit 20 side. The support member 120 is arranged so as not to overlap with the emission surface 21 in the direction D.

The display system 10j according to the eleventh embodiment includes a blocking section 100 that blocks image light emitted in a direction toward the lower side in the vertical direction of the vehicle 1, rather than the direction from the emission surface 21 toward the reflection surface 31.

This allows the blocking section 100 to block image light emitted in a direction toward the lower side in the vertical direction of the vehicle 1 rather than the direction from the emission surface 21 toward the reflection surface 31, thereby further reducing obstruction of visibility while preventing the image light from being emitted outside the vehicle 1.

Twelfth embodiment
Fig. 14 is a schematic diagram showing a display system 10k according to a twelfth embodiment. Fig. 14 shows the display system 10k as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 14 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 14, display system 10k differs from display system 10 mainly in that the position of the emission unit 20 is different from the position of the emission unit 20 in display system 10. The following mainly describes the differences from display system 10.

The exit surface 21 is arranged so as to be parallel to a tangent line L1 at the center of the reflecting surface 31. The tangent line L1 is inclined so as to be positioned on the side of the exit surface 21 as it moves upward in the vertical direction of the vehicle 1, and the exit surface 21 is inclined so as to be positioned on the opposite side to the reflecting surface 31 as it moves upward in the vertical direction of the vehicle 1. The inclination angle of the exit surface 21 with respect to the vertical direction of the vehicle 1 is equal to the inclination angle of the tangent line L1 with respect to the vertical direction of the vehicle 1.

In the display system 10k according to the twelfth embodiment, the reflecting surface 31 is a concave curved surface, and the exit surface 21 is arranged to be parallel to the tangent line L1 at the center of the reflecting surface 31.

This makes it possible to make the distance between the exit surface 21 and the reflecting surface 31 more uniform, thereby preventing distortion of the image formed by the image light reflected by the reflecting surface 31.

Thirteenth embodiment
Fig. 15 is a schematic diagram showing a display system 101 according to a thirteenth embodiment. Fig. 15 shows the display system 101 as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 15 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 15, display system 10l differs from display system 10 mainly in that the position of the emission unit 20 is different from the position of the emission unit 20 in display system 10. The following mainly describes the differences from display system 10.

The exit surface 21 is provided so as to be inclined with respect to the vertical direction of the vehicle 1 with respect to the tangent line L1 at the center of the reflecting surface 31. The tangent line L1 is inclined so as to be located on the side of the exit surface 21 as it moves toward the upper side in the vertical direction of the vehicle 1, and the exit surface 21 is inclined so as to be located on the opposite side to the reflecting surface 31 as it moves toward the upper side in the vertical direction of the vehicle 1. The inclination angle of the exit surface 21 with respect to the vertical direction of the vehicle 1 is greater than the inclination angle of the tangent line L1 with respect to the vertical direction of the vehicle 1. As a result, in a virtual image viewed through the reflecting surface 31, which is a concave curved surface, the optical path length from the upper end of the exit surface 21 to the reflecting surface 31 is longer than the optical path length from the lower end of the exit surface 21 to the reflecting surface 31. As a result, the upper side of the virtual image viewed appears to be further back than the lower side. When the image displayed on the exit surface 21 is a rear image of the vehicle 1 as described above, the upper side of the image is the following vehicle and the lower side is the road surface, so the viewed virtual image shows the following vehicle behind the road surface. Therefore, the display system 10l can display images in a more three-dimensional manner.

In the display system 10l according to the thirteenth embodiment, the reflecting surface 31 is a concave curved surface, and the tangent line L1 at the center of the reflecting surface 31 is inclined relative to the vertical direction of the vehicle 1, and the exit surface 21 is inclined relative to the vertical direction of the vehicle 1 more than the tangent line L1.

This allows the distance between one end of the exit surface 21 and the other end of the reflecting surface 31 to be smaller than the distance between one end of the exit surface 21 and one end of the reflecting surface 31, so that the image formed by the image light reflected by the reflecting surface 31 can be displayed more three-dimensionally.

Fourteenth embodiment
Fig. 16 is a schematic diagram showing a display system 10m according to a fourteenth embodiment. Fig. 16 shows the display system 10m as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 16 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 16, display system 10m differs from display system 10 mainly in that it further includes a λ/4 plate 130 and in that it includes optical unit 40m instead of optical unit 40. The following mainly describes the differences from display system 10.

The λ/4 plate 130 is provided between the exit surface 21 and the reflecting surface 31. For example, the λ/4 plate 130 is adhered to the exit surface 21, but may be provided at a distance from the exit surface 21. The λ/4 plate 130 converts P-polarized light into circularly polarized light, S-polarized light into circularly polarized light, and circularly polarized light into P-polarized light or S-polarized light.

The optical section 40m has a λ/4 plate 43 provided on the reflecting section 30 side of the polarizing plate 41. In this embodiment, the λ/4 plate 43 is adhered to the polarizing plate 41 so as to overlap with the polarizing plate 41. The λ/4 plate 43 converts P polarized light into circular polarized light, S polarized light into circular polarized light, and circular polarized light into P polarized light or S polarized light.

For example, the P-polarized image light emitted from the exit surface 21 becomes circularly polarized light by the λ/4 plate 130, and is reflected by the reflecting surface 31 after becoming circularly polarized light. Also, for example, the P-polarized image light emitted from the exit surface 21 becomes circularly polarized light by the λ/4 plate 43, and after becoming circularly polarized light, it is returned to P-polarized light by the λ/4 plate 43, and after returning to P-polarized light, it is absorbed by the polarizing plate 41. Also, for example, S-polarized external light passes through the polarizing plate 41, becomes circularly polarized light by the λ/4 plate 43, and is emitted into the interior of the vehicle 1. As a result, since both the image light and the external light become circularly polarized light, even if the driver of the vehicle 1 wears polarized sunglasses, both lights can be seen, and obstruction of visibility is suppressed.

For example, the λ/4 plate 43 may be provided so that the P-polarized image light emitted from the exit surface 21 is circularly polarized by the λ/4 plate 43, and then, after being circularly polarized, is converted to S-polarized light by the λ/4 plate 43. In this case, the polarizing plate 41 may be a transmissive polarizing plate that transmits P-polarized light. In this case, for example, P-polarized external light is circularly polarized by the λ/4 plate 43 after transmitting through the polarizing plate 41, and is then emitted into the interior of the vehicle 1.

The display system 10m according to the fourteenth embodiment includes a λ/4 plate 130 provided between the exit surface 21 and the reflecting surface 31, and the optical unit 40m includes a λ/4 plate 43 provided on the reflecting unit 30 side of the polarizing plate 41.

This allows the external light to be circularly polarized and emitted into the interior of the vehicle 1, further reducing obstruction to visibility while preventing image light from being emitted outside the vehicle.

Fifteenth embodiment
Fig. 17 is a schematic diagram showing a display system 10n according to a fifteenth embodiment. Fig. 17 shows the display system 10n as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 17 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 17, display system 10n differs from display system 10 mainly in that display system 10n includes optical unit 40n instead of optical unit 40. The following mainly describes the differences from display system 10.

Optical unit 40n differs from optical unit 40 mainly in that it has polarizing plate 41n instead of polarizing plate 41.

The polarizing plate 41n is a reflective polarizing plate that reflects image light that is emitted from the exit surface 21 and is not reflected by the reflecting surface 31. The polarizing plate 41n reflects light that vibrates in the same direction as the vibration direction of the image light emitted from the exit surface 21. For example, when P-polarized image light is emitted from the exit surface 21, the polarizing plate 41n is a reflective polarizing plate that reflects P-polarized light. In this case, the polarizing plate 41n can reflect P-polarized image light emitted from the exit surface 21 (see the thick dashed arrow in FIG. 17) and transmit S-polarized external light (see the thick dashed arrow in FIG. 17). In this way, the polarizing plate 41n reflects image light that is emitted from the exit surface 21 and is not reflected by the reflecting surface 31, and transmits polarized light that vibrates in a different direction from the image light among the external light.

In the display system 10n according to the fifteenth embodiment, the polarizing plate 41n is a reflective polarizing plate that reflects the image light that is emitted from the emission surface 21 and is not reflected by the reflection surface 31.

This prevents the polarizing plate 41n from absorbing image light and generating heat, thereby preventing deterioration of the polarizing plate 41n due to heat generation by the polarizing plate 41n.

Sixteenth embodiment
Fig. 18 is a schematic diagram showing a display system 10n according to a sixteenth embodiment. Fig. 18 shows the display system 10n as viewed from the left side in the left-right direction of a vehicle 1p. In Fig. 18, a windshield 2p of the vehicle 1p and a ceiling 3 of the vehicle 1p are shown in cross section.

As shown in FIG. 18, the display system 10n is mounted on a vehicle 1p instead of the vehicle 1. The vehicle 1p is provided with a windshield 2p that is different from the windshield 2. The windshield 2p is provided so as to be inclined in the vertical direction of the vehicle 1p from the tangent line L1. The windshield 2p is provided so as to be inclined in the vertical direction of the vehicle 1p from the tangent line L1 at the center of the reflecting surface 31. The tangent line L1 is inclined so as to be positioned on the exit surface 21 side as it moves toward the upper side in the vertical direction of the vehicle 1p, and the windshield 2p is inclined so as to be positioned on the rear side in the front-to-rear direction of the vehicle 1p as it moves toward the upper side in the vertical direction of the vehicle 1p. The inclination angle of the windshield 2p with respect to the vertical direction of the vehicle 1p is greater than the inclination angle of the tangent line L1 with respect to the vertical direction of the vehicle 1p.

In the display system 10n according to the sixteenth embodiment, the polarizing plate 41n is a reflective polarizing plate that reflects image light that is emitted from the exit surface 21 and is not reflected by the reflecting surface 31, the reflecting surface 31 is a concave curved surface, and is arranged so that the tangent line L1 at the center of the reflecting surface 31 is inclined relative to the vertical direction of the vehicle 1p, and the windshield 2p is arranged so that it is inclined relative to the vertical direction of the vehicle 1p more than the tangent line L1.

This makes it easier for the polarizing plate 41n to reflect the image light that is emitted from the exit surface 21 and is not reflected by the reflecting surface 31 downward, thereby preventing the image light reflected by the polarizing plate 41n from being seen by people riding on the vehicle 1p.

Seventeenth embodiment
Fig. 19 is a schematic diagram showing a display system 10p according to a seventeenth embodiment. Fig. 20 is a plan view showing the display system 10p according to the seventeenth embodiment. Fig. 19 shows the display system 10p as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 19 shows a cross section of the windshield 2 of the vehicle 1 and the ceiling 3 of the vehicle 1.

As shown in FIG. 19, display system 10p differs from display system 10 mainly in that it has a reflecting portion 30p instead of reflecting portion 30, and in that it has a holding portion 140p (shown by a dashed line) that holds reflecting portion 30p so that it can rotate freely. The following will focus on the differences from display system 10.

The reflecting surface 31p of the reflecting portion 30p includes a first reflecting surface 311p and a second reflecting surface 312p arranged back to back. Specifically, the first reflecting surface 311p and the second reflecting surface 312p are arranged back to back in the fore-and-aft direction of the vehicle 1. The first reflecting surface 311p is a flat mirror, and the second reflecting surface 312p is a concave mirror. A polarizing sheet 150p is laminated on both the first reflecting surface 311p and the second reflecting surface 312p. The polarizing sheet 150p has the property of transmitting the image light emitted from the exit surface 21 and not directly reflecting the external light transmitted through the polarizing plate 41.

The holding part 140p includes a ball joint 141p, a holding body 142p, and an operating part 143p. The ball joint 141p connects the holding body 142p to the ceiling 3 of the vehicle 1. The ball joint 141p allows the attitude of the holding body 142p to be adjusted. The holding body 142p is a frame that holds the reflecting part 30p. The holding body 142p is formed in an inverted U-shape in a plan view, and holds the reflecting part 30p rotatably at both ends. The operating part 143p is connected to the reflecting part 30p via the holding body 142p, and when rotated by a person, the reflecting part 30p also rotates in conjunction with the operation. This allows the first reflecting surface 311p of the reflecting part 30p to face the front of the vehicle 1 (see FIG. 19) or the second reflecting surface 312p to face the front of the vehicle 1 (see FIG. 21). FIG. 21 is a schematic diagram showing a display system 10p according to the seventeenth embodiment after the orientation of the reflector 30p has been adjusted.

In the state shown in FIG. 19, the second reflecting surface 312p, which is a concave mirror, faces the exit surface 21. In this state, the exit unit 20 emits image light from the exit surface 21, so the image light reflects off the second reflecting surface 312p and heads toward the person riding on the vehicle 1. Here, if the polarizing sheet 150p is a polarizing sheet that absorbs S-polarized light and transmits other polarized light, the image light, which is P-polarized light, passes through the polarizing sheet 150p, reaches the second reflecting surface 312p, is reflected, and passes through the polarizing sheet 150p again toward the person.

On the other hand, although the external light incident from the windshield 2 contains P-polarized and S-polarized light, the P-polarized light is absorbed as it passes through the polarizing plate 41, and the S-polarized light reaches the polarizing sheet 150p of the first reflecting surface 311p. Because this S-polarized light is absorbed by the polarizing sheet 150p, it is not reflected by the first reflecting surface 311p. In other words, the external light that passes through the polarizing plate 41 is not reflected directly by the polarizing sheet 150p.

In the state shown in FIG. 21, the first reflecting surface 311p, which is a flat mirror, faces the exit surface 21. In this state, when the exit unit 20 is OFF, no image light is emitted from the exit surface 21. Therefore, the first reflecting surface 311 reflects external light incident from the rear of the vehicle 1. This external light contains P-polarized light and S-polarized light, but as it passes through the polarizing sheet 150p of the first reflecting surface 311p, the S-polarized light is absorbed and becomes P-polarized light, which is reflected by the first reflecting surface 311p. Due to this reflection, the P-polarized light passes through the polarizing sheet 150p again and heads toward the person. The exit unit 20 may be turned ON/OFF manually or in conjunction with the rotation of the reflecting unit 30p.

On the other hand, the external light entering through the windshield 2 also contains P-polarized and S-polarized light, but the P-polarized light is absorbed as it passes through the polarizing plate 41, and the S-polarized light reaches the polarizing sheet 150p of the second reflecting surface 312p. This S-polarized light is absorbed by the polarizing sheet 150p, so it is not reflected by the second reflecting surface 312p. In other words, the external light that passes through the polarizing plate 41 is not reflected directly by the polarizing sheet 150p.

In this way, by inverting the reflecting portion 30p, it is possible to switch between whether a person sees the image light from the emitting portion 20 or the reflected image behind the vehicle 1. This switching can be performed according to the person's preference, or when the emitting portion 20 breaks down. In either case, the polarizing sheet 150p on each reflecting surface (first reflecting surface 311p, second reflecting surface 312p) prevents external light entering from the windshield 2 from being reflected by the reflecting portion 30p and being emitted from the windshield 2 again.

Figure 22 is a top view showing the positional relationship between the reflector 30p and the emitter 20 in a display system 10p according to a seventeenth embodiment. As shown in Figure 22, the reflector 30p and the emitter 20 are arranged side by side in the fore-aft direction of the vehicle 1. Specifically, in this embodiment, the reflector 30p and the emitter 20 are arranged on the center line L4, but they may be off the center line L4 as long as they are arranged in the fore-aft direction. With this layout, the image light from the emitter 20 and the rearward reflected image of the vehicle 1 can be directed toward the person (head 4) riding on the vehicle 1 simply by inverting the reflector 30p.

In the present embodiment, the polarizing sheet 150p is an example of a polarizing sheet that absorbs S-polarized light and transmits other polarized light. However, the polarizing sheet 150p may be any polarizing sheet that absorbs or reflects external light that has passed through the polarizing plate 41. For example, the polarizing sheet 150p may be a polarizing sheet that absorbs P-polarized light and transmits other polarized light. In this case, the exit unit 20 may emit S-polarized image light from the exit surface 21.

The polarizing sheet 150p may also be a λ/4 plate. When the polarizing sheet 150p is a λ/4 plate, the external light transmitted through the polarizing plate 41 is reflected by the reflecting surface (first reflecting surface 311p or second reflecting surface 312p) after transmitting through the λ/4 plate, and then transmitted through the λ/4 plate again toward the polarizing plate 41. In this way, the external light passes through the λ/4 plate twice, and becomes polarized light that is absorbed by the polarizing plate 41. In other words, even in this case, the light reflected by the reflecting surface (external light) is absorbed by the polarizing plate 41 and is not emitted to the outside of the windshield 2.

The display system 10p according to the seventeenth embodiment includes a holding portion 140p that rotatably holds the reflecting portion 30p, and the reflecting surface 31p includes a first reflecting surface 311p and a second reflecting surface 312p that are arranged back to back, and a polarizing sheet 150p that does not directly reflect the external light that has passed through the polarizing plate 41 is laminated on the first reflecting surface 311p and the second reflecting surface 312p.

In this way, the holding portion 140p holds the reflecting portion 30p rotatably, so that the reflecting portion 30p can be easily rotated. Here, the reflecting portion 30p is provided with a first reflecting surface 311p and a second reflecting surface 312p that face away from each other, so that the first reflecting surface 311p or the second reflecting surface 312p can be directed toward a person riding in the vehicle 1 by rotating it. Both the first reflecting surface 311p and the second reflecting surface 312p are laminated with a polarizing sheet 150p that does not directly reflect external light that has passed through the polarizing plate 41. Since such a polarizing sheet 150p is provided, it is possible to prevent the reflecting surface (the first reflecting surface 311p or the second reflecting surface 312p) facing the windshield 2 from reflecting external light to the outside of the vehicle 1.

In the display system 10p according to the seventeenth embodiment, the reflector 30p and the emitter 20 are aligned in the front-to-rear direction.

With this, the rotating reflector 30p and the emitter 20 are aligned in the front-to-rear direction, so that by simply flipping the reflector 30p, the image light from the emitter 20 and the rear reflected image of the vehicle can be directed toward the person riding in the vehicle.

(Eighteenth embodiment)
Fig. 23 is a schematic diagram showing a display system 10q according to an eighteenth embodiment. Fig. 23 shows the display system 10q as viewed from the left side in the left-right direction of the vehicle 1. Note that Fig. 23 shows a cross section of a windshield 2 of the vehicle 1 and a ceiling 3 of the vehicle 1.

As shown in FIG. 23, display system 10q differs from display system 10 mainly in that it has optical unit 40q instead of optical unit 40, and in that it has carrier 160q that supports optical unit 40q. The following will focus on the differences from display system 10.

The carrier 160q is a translucent plate disposed between the windshield 2 and the reflector 30. The upper end of the carrier 160q is disposed above the upper end of the reflector 30, and the lower end of the carrier 160q is disposed below the lower end of the reflector 30. The optical unit 40q (polarizing plate 41q) is entirely laminated on the surface of the carrier 160q facing the reflector 30. The optical unit 40q may be laminated on the surface of the carrier 160q facing the windshield 2. In this embodiment, the optical unit is not laminated on the windshield 2. In this way, since it is not necessary to laminate the optical unit on the windshield 2, the installation work of the optical unit can be simplified.

In this way, in the display system 10p according to the seventeenth embodiment, the optical unit 40q is supported by a light-transmitting carrier 160q provided between the windshield 2 and the reflector 30.

With this, the optical unit 40q is supported by the light-transmitting carrier 160q provided between the windshield 2 and the reflector 30, so the optical unit 40q can be positioned closer to the emission unit 20 than the windshield 2. In other words, the optical unit 40q can block image light before it reaches the windshield 2. For example, if the optical unit provided on the windshield 2 and the optical unit 40q provided on the carrier 160q have the same bottom end position, the optical unit 40q provided on the carrier 160q can block light over a wider range.

(Other embodiments, etc.)
Although the display system according to one or more aspects of the present disclosure has been described based on the embodiment, the present disclosure is not limited to this embodiment. As long as it does not deviate from the spirit of the present disclosure, various modifications conceived by a person skilled in the art to this embodiment and forms constructed by combining components in different embodiments may also be included within the scope of one or more aspects of the present disclosure.

(Additional Note)
The above description of the embodiments and the like discloses the following techniques.

(Technique 1)
an emission section that is provided rearward of a windshield of the vehicle in a front-rear direction of the vehicle and has an emission surface that emits image light toward the windshield;
a reflecting portion provided between the windshield and the light exiting surface and having a reflecting surface that reflects the image light exiting from the light exiting surface;
a polarizing plate that absorbs or reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface and transmits external light that is light outside the vehicle, and an optical unit that is provided on the windshield or between the windshield and the reflection unit;
Display system.

(Technique 2)
the polarizing plate is provided at least one of above a straight line passing through an upper edge of the exit surface and an upper edge of the reflecting portion in a vertical direction of the vehicle and below a straight line passing through a lower edge of the exit surface and a lower edge of the reflecting portion in a vertical direction of the vehicle.
A display system according to claim 1.

(Technique 3)
The optical unit has a λ/4 plate provided on the opposite side of the polarizing plate to the reflecting unit side.
3. A display system according to claim 1 or 2.

(Technique 4)
a correction lens provided between the exit surface and the reflecting surface, for transmitting the image light exited from the exit surface toward the reflecting surface and correcting an image formed by the image light reflected on the reflecting surface;
A display system according to any one of claims 1 to 3.

(Technique 5)
a correction lens that is provided between the emission surface and the reflection surface and transmits the image light emitted from the emission surface toward the reflection surface and corrects an image formed by the image light reflected by the reflection surface; and a correction unit that corrects the image formed by the image light reflected by the reflection surface by controlling a position of the correction lens based on at least one of a head position and an eye position of the person photographed by the photography unit.
A display system according to any one of claims 1 to 3.

(Technique 6)
a photographing unit that photographs a person riding on the vehicle, and a correction unit that corrects an image formed by the image light reflected on the reflecting surface by correcting an image signal that is a basis of the image light based on at least one of a head position and an eye position of the person photographed by the photographing unit,
A display system according to any one of claims 1 to 3.

(Technique 7)
The emission surface and the reflection surface are provided on a driver's seat side of the vehicle relative to a center of the vehicle in a left-right direction of the vehicle.
A display system according to any one of claims 1 to 6.

(Technique 8)
The light exit surface and the light reflecting surface are provided so that, when viewed from above and below the vehicle, a straight line passing through a center of the light exit surface and a center of the light reflecting surface passes through a head of a person riding on the vehicle.
A display system according to any one of claims 1 to 7.

(Technique 9)
The polarizing plate is not provided in at least a part of a portion of the windshield that overlaps with the reflecting portion in a direction in which the light exit surface and the reflecting surface are aligned.
A display system according to any one of claims 1 to 8.

(Technique 10)
a louver film provided between the exit surface and the reflecting surface, which transmits the image light emitted in a direction from the exit surface toward the reflecting surface and blocks the image light emitted in a direction toward a lower side in the vertical direction of the vehicle than the direction from the exit surface toward the reflecting surface;
A display system according to any one of claims 1 to 9.

(Technique 11)
a blocking portion that blocks the image light emitted in a direction toward a lower side in the vertical direction of the vehicle than a direction from the emission surface toward the reflection surface,
A display system according to any one of claims 1 to 9.

(Technique 12)
a λ/4 plate provided between the emission surface and the reflection surface,
The optical unit has a λ/4 plate provided on the reflecting unit side of the polarizing plate.
12. A display system according to any one of claims 1 to 11.

(Technique 13)
The polarizing plate is a reflective polarizing plate that reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface.
13. A display system according to any one of claims 1 to 12.

(Technique 14)
the reflecting surface is a concave curved surface,
The exit surface is arranged so as to be parallel to a tangent at the center of the reflecting surface.
14. A display system according to any one of claims 1 to 13.

(Technique 15)
The reflection surface is a concave curved surface, and is provided so that a tangent at a center of the reflection surface is inclined with respect to a vertical direction of the vehicle.
The emission surface is provided so as to be inclined with respect to the vertical direction of the vehicle with respect to the tangent line.
14. A display system according to any one of claims 1 to 13.

(Technique 16)
the polarizing plate is a reflective polarizing plate that reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface,
The reflection surface is a concave curved surface, and is provided so that a tangent at a center of the reflection surface is inclined with respect to a vertical direction of the vehicle.
The windshield is provided so as to be inclined with respect to the vertical direction of the vehicle relative to the tangent line.
13. A display system according to any one of claims 1 to 12.

(Technique 17)
The display system includes a holding unit that rotatably holds the reflecting unit,
The reflecting surface includes a first reflecting surface and a second reflecting surface arranged back to back with each other,
a polarizing sheet that does not directly reflect the external light transmitted through the polarizing plate is laminated on the first reflection surface and the second reflection surface;
A display system according to any one of the preceding claims.

(Technique 18)
The reflecting portion and the emitting portion are aligned in the front-rear direction.
20. The display system of claim 17.

(Technique 19)
The optical unit is supported by a light-transmitting carrier provided between the windshield and the reflecting unit.
A display system according to any one of the preceding claims.

(Technique 20)
The optical unit has an absorptance of the image light or a transmittance of the external light having a gradient in the vertical direction.
A display system according to any one of claims 1 to 19.

(Technology 21)
The optical unit is provided on the windshield.
A display system according to any one of the preceding claims.

This disclosure can be used in display systems that display images.

REFERENCE SIGNS LIST 1, 1p vehicle 2, 2p windshield 3 ceiling 4 head 5 part 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10i, 10j, 10k, 10l, 10m, 10n, 10p, 10q display system 20 exit part 21 exit surface 30, 30p reflecting part 31, 31p reflecting surface 40, 40a, 40g, 40m, 40n, 40q optical part 41, 41g, 41n, 41q polarizing plate 42, 43, 130 λ/4 plate 50 correction lens 60 shooting part 70 correction part 80 actuator 90 louver film 100, 110 blocking part 120 support member 140p Holding portion 141p ball joint 142p holding body 143p operation portion 150p polarizing sheet 160q carrier 311p first reflecting surface 312p second reflecting surface D direction L1 tangent line L2, L3, L5 straight line L4 center line

Claims (21)

an emission section that is provided rearward of a windshield of the vehicle in a front-rear direction of the vehicle and has an emission surface that emits image light toward the windshield;
a reflecting portion provided between the windshield and the light exiting surface and having a reflecting surface that reflects the image light exiting from the light exiting surface;
a polarizing plate that absorbs or reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface and transmits external light that is light outside the vehicle, and an optical unit that is provided on the windshield or between the windshield and the reflection unit;
Display system. the polarizing plate is provided at least one of above a straight line passing through an upper edge of the exit surface and an upper edge of the reflecting portion in a vertical direction of the vehicle and below a straight line passing through a lower edge of the exit surface and a lower edge of the reflecting portion in a vertical direction of the vehicle.
The display system of claim 1 . The optical unit has a λ/4 plate provided on the opposite side of the polarizing plate to the reflecting unit side.
3. A display system according to claim 1 or 2. a correction lens provided between the exit surface and the reflecting surface, for transmitting the image light exited from the exit surface toward the reflecting surface and correcting an image formed by the image light reflected on the reflecting surface;
3. A display system according to claim 1 or 2. a correction lens that is provided between the emission surface and the reflection surface and transmits the image light emitted from the emission surface toward the reflection surface and corrects an image formed by the image light reflected by the reflection surface; and a correction unit that corrects the image formed by the image light reflected by the reflection surface by controlling a position of the correction lens based on at least one of a head position and an eye position of the person photographed by the photography unit.
3. A display system according to claim 1 or 2. a photographing unit that photographs a person riding on the vehicle, and a correction unit that corrects an image formed by the image light reflected on the reflecting surface by correcting an image signal that is a basis of the image light based on at least one of a head position and an eye position of the person photographed by the photographing unit,
3. A display system according to claim 1 or 2. The emission surface and the reflection surface are provided on a driver's seat side of the vehicle relative to a center of the vehicle in a left-right direction of the vehicle.
3. A display system according to claim 1 or 2. The light exit surface and the light reflecting surface are provided so that, when viewed from above and below the vehicle, a straight line passing through a center of the light exit surface and a center of the light reflecting surface passes through a head of a person riding on the vehicle.
3. A display system according to claim 1 or 2. The polarizing plate is not provided in at least a part of a portion of the windshield that overlaps with the reflecting portion in a direction in which the light exit surface and the reflecting surface are aligned.
3. A display system according to claim 1 or 2. a louver film provided between the exit surface and the reflecting surface, which transmits the image light emitted in a direction from the exit surface toward the reflecting surface and blocks the image light emitted in a direction toward a lower side in the vertical direction of the vehicle than the direction from the exit surface toward the reflecting surface;
3. A display system according to claim 1 or 2. a blocking portion that blocks the image light emitted in a direction toward a lower side in the vertical direction of the vehicle than a direction from the emission surface toward the reflection surface,
3. A display system according to claim 1 or 2. a λ/4 plate provided between the emission surface and the reflection surface,
The optical unit has a λ/4 plate provided on the reflecting unit side of the polarizing plate.
3. A display system according to claim 1 or 2. The polarizing plate is a reflective polarizing plate that reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface.
3. A display system according to claim 1 or 2. the reflecting surface is a concave curved surface,
The exit surface is arranged so as to be parallel to a tangent at the center of the reflecting surface.
3. A display system according to claim 1 or 2. The reflection surface is a concave curved surface, and is provided so that a tangent at a center of the reflection surface is inclined with respect to a vertical direction of the vehicle.
The emission surface is provided so as to be inclined with respect to the vertical direction of the vehicle with respect to the tangent line.
3. A display system according to claim 1 or 2. the polarizing plate is a reflective polarizing plate that reflects the image light that is emitted from the emission surface and is not reflected by the reflection surface,
The reflection surface is a concave curved surface, and is provided so that a tangent at a center of the reflection surface is inclined with respect to a vertical direction of the vehicle.
The windshield is provided so as to be inclined with respect to the vertical direction of the vehicle relative to the tangent line.
3. A display system according to claim 1 or 2. A holding portion that rotatably holds the reflecting portion,
The reflecting surface includes a first reflecting surface and a second reflecting surface arranged back to back with each other,
a polarizing sheet that does not directly reflect the external light transmitted through the polarizing plate is laminated on the first reflection surface and the second reflection surface;
3. A display system according to claim 1 or 2. The reflecting portion and the emitting portion are aligned in the front-rear direction.
20. The display system of claim 17. The optical unit is supported by a light-transmitting carrier provided between the windshield and the reflecting unit.
3. A display system according to claim 1 or 2. The optical unit has an absorptance of the image light or a transmittance of the external light having a gradient in the vertical direction.
3. A display system according to claim 1 or 2. The optical unit is provided on the windshield.
3. A display system according to claim 1 or 2.

Images