Front row seats including integrated projectors for generating suspended, real imagery for passengers in back rows of a vehicle

Abstract

This invention relates to a headrest or backrest configured for installation in a vehicle seat and including an integrated privacy display for a passenger seated behind it. The privacy display includes: - an image generator disposed within the headrest or backrest and configured to generate a beam of light with desired display content; - a cover or layer configured to allow the light beam to pass through, the cover or layer forming a surface segment on the back side of the headrest or backrest; and - a projection and imaging optical system disposed and configured in the optical path between the image generator and the cover or layer, such that the light beam exits the cover or layer directly toward an eye-box determined for the passenger's eyes, and the display content is imaged onto a real image suspended in the air between the cover or layer and the eye-box.

Description

Technical Field

[0001] This invention relates to a headrest or backrest configured for installation in a vehicle seat and including an integrated display for a passenger seated behind it. The invention also relates to the vehicle seat and the vehicle equipped with the vehicle seat. The vehicle may be a motor vehicle or other type of land, air, or water transport. Background Technology

[0002] In motor vehicles or aircraft with seats arranged in a fore-and-aft configuration, direct-view displays in the form of flat-panel displays are often installed on the back of the seats in front of passengers in the corresponding rear seats. The images displayed on these direct-view displays are generally well visible from different directions and therefore have little or no privacy features.

[0003] On the other hand, as known, for example from CN217821128U, when the driver and / or co-driver of a vehicle looks at the windshield, a real image suspended in the air fades into their field of vision. This is achieved using a concave mirror for imaging, where the light path is then guided to the driver's and / or co-driver's eye box by reflection on the windshield, thus involving a so-called head-up display (HUD). However, even in situations of high ambient brightness, it is not easy to present the faded image with sufficient brightness and high contrast in the transparent area of ​​the windshield. Summary of the Invention

[0004] The objective of this invention is to provide an alternative and / or improved display solution for passengers in the rear seats of a vehicle, which can achieve improvements over known display devices, for example, in terms of application feasibility, structural space, contrast, visibility and / or other aspects.

[0005] This task is accomplished by a headrest or backrest as claimed in claim 1, a vehicle seat comprising the headrest or backrest as claimed in the parallel claims, and a vehicle equipped with the vehicle seat. Other design options are given in the dependent claims. All further features and effects for the headrest or backrest mentioned in the claims and the following description also apply to the vehicle seat and the vehicle, and vice versa.

[0006] According to the first aspect, a headrest or backrest is provided, designed for installation in a vehicle seat. The vehicle may be a motor vehicle, but may also be any other land, air, or water vehicle, particularly an aircraft. Unless otherwise stated, all spatial orientation concepts used herein, such as “up,” “down,” “lateral,” “horizontal,” “vertical,” “front,” “rear,” etc., refer to a common Cartesian coordinate system fixed for vehicles, having mutually perpendicular longitudinal, lateral, and vertical directions.

[0007] A privacy display is integrated into the headrest or backrest. The privacy display is designed to provide a display for passengers who should be seated directly behind the vehicle's seats (i.e., without any objects interfering with light propagation).

[0008] The privacy display includes an image generator disposed inside the headrest or backrest and configured to generate a beam of light (also referred to herein as “projector light”) with desired display content. Furthermore, the privacy display includes a cover (also referred to as cover glass) or cover layer configured to allow the light beam to pass through, the cover or cover layer forming a surface section on the back side of the headrest or backrest and thus facing directly toward the passenger when the vehicle is in operation.

[0009] Furthermore, the privacy display includes a projection and imaging optics system in the optical path between the image generator and the cover plate or cover layer. This projection and imaging optics system is arranged and configured such that a light beam exits the cover plate or cover layer in an emission direction directly (i.e., without any other deflecting optics) directed to a pre-defined spatial region (eye box) for the passenger's eyes. Here, the projection and imaging optics system is configured to present the displayed content to the passenger as a real image freely suspended in the air between the passenger's eye box and the cover plate / cover layer. If the passenger's eyes are located within the eye box and the passenger is looking towards the cover plate / cover layer, the passenger can see the image. The suspended image is real, meaning that the image can be recorded by a photosensitive material and can be made visible to all people by a light-scattering surface if such a material or surface is placed at the image location.

[0010] As is commonly understood, the following spatial region is considered the eyebox, from which the suspended real image is presented is unrestrictedly visible. In other words, the light beam is essentially confined to this spatial region. Therefore, the resulting image is only visible to the passenger if the passenger's eyes are within this predetermined eyebox, which, for example, does not exceed the width of the passenger's own vehicle seat. This allows for the presentation of confidential content ("privacy") to the passenger. On the other hand, other occupants, such as other passengers or flight attendants, will not be visually disturbed by the display because they cannot see it. Furthermore, by spatially confining the light beam to the eyebox region in this way, the light energy required to generate the light beam is also saved.

[0011] The concept of this invention thus lies in integrating a projector with a suspended real-image projection (privacy display) into the front seats of a vehicle for use by passengers in the rear seats. Integration of a display device for passengers in the rear area of ​​a vehicle can be difficult both in terms of structural space technology and in terms of non-reflectivity and visibility. These difficulties can be overcome by the construction and arrangement of the privacy display in the headrest or backrest of the front seat proposed herein, as explained in more detail below with the aid of some examples. Compared to head-up displays where the image is superimposed on a bright external environment, the proposed privacy display has the advantage, for example, that the cover / layer of the privacy display, together with the headrest / backrest and the interior of the privacy display located behind it, serves as the image background. This allows for a significant increase in image brightness, largely independent of ambient light, and also a significant improvement in contrast. Unlike conventional direct-view displays, in a privacy display, the displayed content is protected from being viewed by others due to its space-constrained eye box.

[0012] The projection and imaging optical system, particularly by appropriately selecting its effective focal length, enables the generation of a real image at a comfortable image distance for the passenger's eyes. This image distance in this privacy display can be, for example, less than one meter or even less than half a meter. Such an image distance is particularly optimized for reading or working, but is also very suitable for entertainment content such as games or videos.

[0013] For image generators, this principle applies to every imaging technique. The image generator can be specifically configured to dynamically generate desired or desired display content within a two-dimensional pixel matrix. For example, the image generator can be configured as a light-transmitting or light-emitting flat panel display, such as a liquid crystal display (LCD), μLED, or OLED display, but alternatively, it can be configured as a projector-based image generator or a waveguide-based display. This enables the generation of display content, for example, that can reproduce the desktop of a working computer or an open book and / or can be controlled by the relevant passenger via a suitable user interface in a vehicle (e.g., through voice input, touchpad, keyboard, and many other means).

[0014] The cover plate / cover can be made of any material suitable for its function as described herein, such as plastic or glass. The cover plate / cover and its user-side surface, in particular, can be configured as planar (i.e., flat). However, the cover plate / cover can also have freeform surfaces on one or both sides for producing predetermined optical effects. Furthermore, the cover plate / cover can also be used for mechanical protection of the optical components of a privacy display, particularly the imaging optics system and image generator.

[0015] According to one embodiment, the projection and imaging optical system includes a concave mirror and / or a converging lens configured to image the display content generated in the image generator onto a real image suspended in air between the eyepiece and the cover plate. To improve imaging performance and / or additionally reduce structural space, the projection and imaging optical system may, in particular, include two concave mirrors directly opposite each other in the optical path of the light beam and / or a lens system composed of multiple lenses. Corresponding imaging optical elements may also be additionally designed for beam deflection, image magnification, and / or image correction of the light beam. Furthermore, the projection and imaging optical system may also include other deflection elements, such as plane mirrors, for folding the optical path.

[0016] According to an improved embodiment, the image generator is configured to generate a linearly polarized beam of light with a predetermined polarization direction, and the projection and imaging optics system or cover plate includes a deflector arranged in the optical path between the image generator and the concave mirror, and also between the concave mirror and the eyepiece. The deflector is configured to achieve substantially lossless reflection with respect to the stated polarization direction and substantially lossless transmission with respect to a polarization direction perpendicular to this. Here, "substantially lossless reflection" can, for example, mean a reflectance greater than 50%, particularly greater than 60% or 70%, and ideally greater than 80% or 90%. Similarly, "substantially lossless transmission" can, for example, mean a transmission coefficient greater than 50%, particularly greater than 60% or 70%, and ideally greater than 80% or 90%. The deflector can be arranged, for example, as a separate element in the optical path of the beam of light between the first concave mirror and the cover plate, but may also be integrated into or constitute part of the cover plate.

[0017] Furthermore, the projection and imaging optics system here includes a polarization converter in the optical path between the deflector and the concave mirror. This polarization converter is passed by the light beam before and after its reflection on the concave mirror (i.e., twice in total), thereby rotating the polarization direction of the light beam by 90°. This allows the light beam to pass through the deflector with largely no attenuation and without hindrance after its reflection on the concave mirror, and thus reach the eye box. The deflector is responsible for folding the optical path within the privacy display, so that the path between the deflector and the concave mirror is utilized twice, which can result in a significant reduction in structural space. For this purpose, the polarization converter can be constructed, for example, as a separate element (i.e., as a λ / 4 plate) or as a known λ / 4 retarder in the form of a corresponding coating on the concave mirror.

[0018] For example, in this embodiment, the image generator can be configured to generate a beam of light with horizontal or s-polarization. After passing through a polarization converter twice, this linear polarization of the light beam is converted to vertical deflection or p-polarization, allowing the light beam to pass through the deflecting mirror largely unimpeded. In other words, in this example, the aforementioned polarization direction corresponds to horizontal or s-polarization, the latter of which can be defined, for example, with respect to the reflecting surface involved (i.e., one of the deflecting mirror or a concave mirror).

[0019] According to an alternative embodiment, the projection and imaging optical system includes a microlens array or an arrangement of two or more microlens arrays arranged sequentially in the optical path. Here, the microlens array is configured to image the display content generated in the image generator onto a real image suspended in the air between the eyepiece and the cover plate or capping layer. Here, the capping layer may be constructed on the user-side surface of the last microlens array in the optical path. Alternatively, the cover plate may be disposed separately from the single microlens array or the arrangement of the microlens arrays, which implies additional design freedom not only for the last microlens array in the optical path but also for the cover plate itself.

[0020] The number of microlens arrays and the lens and / or surface geometry of the microlens arrays can be selected differently according to the requirements of specific applications to achieve different angles of divergence and imaging characteristics (e.g., magnification, image distance, etc.). Compared with imaging optics systems based on imaging mirrors or lenses, microlens arrays require less structural space and, for example, can achieve a near-sandwich structure for the entire privacy display with a correspondingly short optical path. Thus, the privacy display can, in particular, have a total thickness of less than 5 cm, for example, about 3 cm to 4 cm, about 3 cm to 3.5 cm, or even less, which further simplifies its integration into headrests or backrests.

[0021] To significantly reduce, or even nearly completely prevent, passengers and other vehicle occupants from seeing the interior of the privacy display, the cover or cover layer can be constructed to be at least partially opaque to ambient light incident from the outside. For this purpose, the cover or cover layer can, for example, include perforated films, particle additions, coloring, tinting, polarizing filters, and / or LC layers that can be switched uniformly (i.e., as a whole) or segmentally. In particular, the cover or cover layer can here have a higher transmittance for projector light emitted outwards than for ambient light incident from the outside, for example through a layer / structure that blocks light on one side or a suitable polarizing filter, which, if necessary, incorporates projector light of corresponding polarization.

[0022] By reducing this transparency, the cover / capsule can be darkened to the point that it forms a dark or even black image background for presenting a suspended real image with particularly high contrast. Since the cover / capsule, along with the interior of the privacy display located behind it, serves as the image background, darkening it can improve image contrast.

[0023] In other words, the cover plate / capsule can be used as a contrast medium for presenting a suspended real image with the desired contrast through its targeted darkening. Because ambient light, unlike projector light, must pass through the cover plate / capsule twice to illuminate the interior of the display for the occupants, it can also be attenuated by at least twice the amount of projector light through light-absorbing particles, perforations, or suitable polarizing filters in the cover plate / capsule. Thus, a perforated film, for example, with a transmittance of approximately 40%, can ensure defect-free visibility of the suspended real image for the occupants, especially since the perforated film allows interfering ambient light to penetrate at less than 16%, thus creating a dark image background.

[0024] A cover plate / cover layer can optionally and additionally contribute to the shaping and / or deflection of the light beam, for example, through a specific prismatic shape, thereby forming part of a projection and imaging optical system. According to one embodiment, the cover plate can be constructed as a prism to deflect the light beam upwards, thereby vertically compressing the structural space required for the privacy display and outputting the light beam directly toward the eye box. In particular, the prism-shaped cover plate / cover layer can therefore have a downwardly tapering shape, at least approximately triangular, in its vertical longitudinal section. Using this construction, for example, it is possible to integrate the privacy display under the headrest of a vehicle seat, where more structural space may be available.

[0025] According to one embodiment, the projection and imaging optical system is designed to present the displayed content as a real image suspended in the air between the cover / cap and the eyepiece in an image plane or a curved image surface. Here, by appropriately selecting the image generator and the relative arrangement and design of the projection and imaging optical system, an optimized orientation (in the sense of image tilt) of the suspended real image plane or image surface for viewing the resulting image can be achieved. This orientation is largely independent of, and can therefore deviate significantly from, the surface geometry of the headrest or backrest or cover / cap. In particular, this allows for the generation of a suspended real image plane or image surface at a location and orientation that are unavailable on rigid display surfaces due to the arm and leg freedom required by the passenger in front of their vehicle seat.

[0026] According to another aspect, the aforementioned vehicle seat arrangement is for vehicles, particularly motor vehicles. The headrest or backrest of the vehicle seat has an integrated privacy display as described herein.

[0027] According to another aspect, the aforementioned means of transport is provided. The means of transport includes a first vehicle seat and a second vehicle seat arranged behind it in the longitudinal direction of the means of transport. Here, a privacy display is integrated into the headrest or backrest of the first vehicle seat and is configured to present a real image suspended between the first and second vehicle seats for a passenger seated in the second vehicle seat. The cover or cover of the privacy display faces the passenger in the second vehicle seat.

[0028] The cover / cover (or its user-side surface) may here be inclined, in particular, from a vertical line toward the vehicle floor at a predetermined first angle of inclination. In other words, the cover / cover is then arranged at an inclination relative to the height direction of the vehicle, wherein the upper edge of the cover / cover is closer to the passenger and the second vehicle seat in the longitudinal direction of the vehicle than its lower edge.

[0029] This tilt of the cover / cover towards the floor ensures that all ambient light rays from the sun or artificial lighting sources inside and outside the vehicle, incident from above onto the cover / cover, are always reflected by the cover / cover towards the vehicle floor and therefore do not reach the eyes of the passenger or other occupants as interference reflections. Furthermore, this tilted orientation of the opening aperture away from the relevant passenger and towards the floor makes it difficult for the relevant passenger to unintentionally peek into the interior of the privacy display. The first tilt angle can be, for example, at least about 10°, especially at least about 20°, or even at least about 30° with respect to the vehicle's height. This tilting arrangement of the cover / cover can, for example, correspond to its tilt / rotation from a vertically oriented position about a horizontal axis that corresponds to the lateral direction of the vehicle when installed in the vehicle.

[0030] Alternatively or additionally, the aforementioned suspended real image plane / image surface can have a spatial orientation that is significantly deviated from the cover / cover by a predetermined second tilt angle from the vertical line toward the canopy (in other words, upwards and therefore toward the eye box). With this tilting arrangement, the suspended real image plane / image surface is thus tilted toward the user, which can be particularly ergonomic. Especially during reading, this can significantly reduce variations in image distance along the suspended real image plane / image surface and the associated variations in the reader's eye focus. The second tilt angle, measured with respect to the vertical line (i.e., the vehicle height direction) in the direction opposite to the aforementioned first tilt angle, can also be, for example, at least about 10°, especially at least about 20°, or even at least about 30°. Therefore, in a vertical cross-sectional plane spanned by the vehicle's longitudinal and height directions, the suspended real image plane / image surface and the user-side cover surface can form acute angles with each other of at least about 10° or 20°, especially at least about 30°, or even at least about 60°. Attached Figure Description

[0031] The above aspects of the invention, their embodiments, and specific design schemes will then be explained in more detail with the aid of examples shown in the accompanying drawings. The drawings should be understood as purely schematic illustrations of the basic optical construction principles, i.e., not drawn to scale. Wherein:

[0032] Figure 1a A vehicle seat with a privacy display integrated in its headrest, according to an embodiment of the present invention, is shown in a vertical longitudinal section; and

[0033] Figure 1b Shown in vertical longitudinal section Figure 1a An enlarged partial view of a vehicle seat, the partial view showing a purely exemplary outline of the optical structure of a privacy display, and the suspended real image and associated eye box generated by the privacy display. Detailed Implementation

[0034] All the different embodiments, alternatives, and specific design features of headrests or backrests, vehicle seats, and vehicles mentioned above in the description and the following claims according to the above aspects of the invention may be used in... Figures 1a to 1b The examples shown can be implemented, in particular, by replacing or adding to the features illustrated therein. Therefore, all of this will not be repeated below. The same applies correspondingly to the conceptual definitions and functions of the various features already given above, which... Figures 1a to 1b As shown in the image.

[0035] Figure 1a A vertical longitudinal sectional view of a vehicle seat 1 having a headrest 4 and a privacy display 2 integrated therein, according to an embodiment of the present invention, is shown. The vehicle seat 1 is configured for installation in a vehicle 3, and in this example, is configured for installation in a motor vehicle. Figure 1a In this context, vehicle 3 is represented solely by a common Cartesian coordinate system K, which is fixed for vehicles and has mutually perpendicular longitudinal, lateral, and vertical directions X, Y, and Z. As already mentioned, unless explicitly stated otherwise, spatial orientation concepts such as "up," "down," "front," "back," "horizontal," and "vertical" are all referenced to this vehicle-fixed coordinate system K for vehicle 3.

[0036] Figure 1b The vehicle 3 or vehicle seat 1 is shown in Figure 1aPart A is marked in the middle. Part A shows a purely exemplary sketch of the optical construction of the privacy display 2 in a highly simplified schematic vertical longitudinal sectional view. The privacy display 2 is integrated inside the headrest 4 and includes an image generator 5 configured to generate a light beam L with desired display content, a cover 6 configured to allow the light beam L to pass through, and a projection and imaging optical system configured between them, which in this example includes an imaging concave mirror 7 and a deflecting mirror 8 that reflects or transmits in a polarization-related manner. The light beam L (projector light) is only schematically represented by its edge rays.

[0037] Image generator 5 is shown schematically only in Figure 1, and in this example has an image generating surface 5a in which the desired display content is generated as a real image. Purely exemplary, the image generator 5 can be configured as a flat panel display, particularly a liquid crystal display (LCD), such that the display content is dynamically generated as a real image on its display surface, which constitutes the aforementioned image generating surface 5a. Alternatively, the image generator 5 can also be configured as a projector, and includes, for example, a projection surface that scatters light, onto which the corresponding display content is projected as a real image, and the projection surface thus serves as the image generating surface 5a. However, instead of this, the projector-based image generator 5 can also include a laser scanner or a light source with a suitable illumination optics system for generating a uniform, collimated beam of illumination rays, and thus the correspondingly illuminated image generating surface 5a (e.g., in the form of a liquid crystal on silicon (LCOS) or a digital-micromirror-device (DMD), not shown separately), which can be manipulated pixel-by-pixel for generating the corresponding display content.

[0038] The user-side surface of the cover 6 forms the back surface section 4a of the headrest 4, which thus faces a passenger positioned directly behind the vehicle seat 1 on another vehicle seat (not shown). In other words, the cover 6 is positioned directly opposite the passenger with its surface facing the passenger. Figure 1b In this example, the passenger is represented only by a predefined spatial area (eyebox E) for their eyes or head. The eyebox E is further depicted purely symbolically and, in this example, is limited to the area of ​​the seat of another vehicle mentioned (not shown).

[0039] The concave mirror 7 is designed to image the display content generated by the image generator 5 in the image generation surface 5a as a real image R freely suspended in the air, which can be seen from the eye box E when viewed towards the cover 6. By appropriately selecting the relative arrangement and design of the image generator 5 and the projection and imaging optical systems, it is possible to achieve an optimized position (in the sense of image distance) and orientation (in the sense of image tilt) of the suspended real image R between the cover 6 and the eye box E, which is impossible to achieve using conventional display technologies such as flat panel displays. In particular, passengers can view the suspended real image R at a comfortable reading distance from their eyes, for example, about 30cm to 50cm, without restricting the freedom of their arms and legs, and the image tilt is independent of the geometry of the surface section 4a of the headrest 4.

[0040] To achieve a significant reduction in structural space, the privacy display 2 may optionally include a deflecting mirror 8, which deflects... Figure 1b The light beam L generated by the image generator 5 in a predetermined linear polarization direction is first incident on the deflecting mirror 8, which is configured to achieve largely lossless reflection of this polarization direction and reflect the light beam L to the concave mirror 7. In this example, the image generator 5 is configured to generate a light beam L with horizontal or s-polarization, and the deflecting mirror 8 has a coating 9 for horizontal or s-reflection, for example, in the form of a correspondingly oriented wire grid polarizer.

[0041] In this example, the concave mirror 7 is equipped with a polarization converter 10 in the form of a λ / 4 coating. The light beam L passes through the polarization converter a total of two times when reflected on the concave mirror 7, and the polarization converter acts as a λ / 4 retarder in each case. Thus, the polarization direction of the light beam L is rotated by 90°. The now vertically polarized or p-polarized light beam L then again enters the deflector 8 and this time is transmitted largely without loss through the horizontally or s-reflected coating 9 of the deflector. Subsequently, the light beam L thus enters the cover plate 6, and the light beam is also transmitted largely without loss through the cover plate, thus reaching the eye box E directly.

[0042] List of reference numerals

[0043] 1. Vehicle Seats

[0044] 2 privacy displays

[0045] 3. Transportation

[0046] 4 headrests

[0047] Surface section on the back side of the 4a headrest

[0048] 5 Image Generator

[0049] 5a image generation surface

[0050] 6 coverslips

[0051] 7-image concave mirror

[0052] 8 deflecting mirrors

[0053] 9. Horizontal or S-reflective coating

[0054] 10 polarization converters

[0055] L, also known as the light beam of a projector.

[0056] R is a real image suspended in the air.

[0057] E Eye Box

[0058] K is a coordinate system fixed for the vehicle.

[0059] X, Y, Z: Longitudinal, Lateral, and Vertical Directions of a Vehicle

Claims

1. A headrest (4) or backrest, said headrest or backrest being configured for installation in a vehicle seat (1) and including an integrated privacy display (2) for a passenger sitting behind it, said privacy display including the following components: - An image generator (5) is arranged inside the headrest (4) or backrest and constructed to generate a beam of light (L) with the desired display content; - A cover or layer (6) is constructed to allow the light beam (L) to pass through, the cover or layer forming a surface section (4a) on the back side of the headrest (4) or backrest; and - A projection and imaging optical system arranged and constructed in the optical path between the image generator (5) and the cover or cover layer (6) such that the light beam (L) leaves the cover or cover layer (6) directly toward the eye box (E) predetermined for the passenger's eyes, and the display content is imaged onto a real image (R) suspended in the air between the cover or cover layer (6) and the eye box (E).

2. The headrest (4) or backrest according to claim 1, wherein, - The projection and imaging optical system includes a concave mirror (7) and / or a converging lens, which are configured to image the display content generated in the image generator (5) onto a real image (R) suspended in the air between the eye box (E) and the cover plate (6).

3. The headrest (4) or backrest according to claim 2, wherein, - The image generator (5) is configured to generate a linearly polarized beam (L) with a predetermined polarization direction; - The projection and imaging optical system or the cover plate (6) includes a deflector (8) arranged in the optical path between the image generator (5) and the concave mirror (7) and also in the optical path between the concave mirror (7) and the eyebox (E), and the deflector is configured to achieve substantially lossless reflection with respect to the mentioned polarization direction and substantially lossless transmission with respect to the polarization direction perpendicular to this; and - The projection and imaging optical system includes a polarization converter (10) in the optical path between the deflector (8) and the concave mirror (7) such that the polarization converter is passed through the light beam (L) a total of twice and thereby rotates the polarization direction of the light beam by 90°.

4. The headrest (4) or backrest according to claim 3, wherein, The deflecting mirror (8) - Constructed as a separate element in the optical path of the light beam (L) between the concave mirror (7) and the cover plate (6); or - It is integrated into or constitutes the cover plate (6).

5. The headrest (4) or backrest according to claim 1, wherein, - The projection and imaging optical system includes a microlens array or an arrangement of two or more microlens arrays in succession in the optical path; - The microlens array is configured to image the display content generated in the image generator (5) onto a real image (R) suspended in the air between the eyepiece (E) and the cover plate or cover layer (6); and - Either the cover layer is constructed on the user-side surface of the last microlens array in the optical path, or the cover is arranged separately from the microlens array or the arrangement of the microlens array.

6. The headrest (4) or backrest according to any one of the preceding claims, wherein, - The cover or cover layer (6) is opaque to ambient light incident from the outside by means of perforated film, particle addition, coloring, tinting, polarizing filter and / or LC layer that can be switched segmentally or uniformly, so that the cover or cover layer substantially prevents vehicle occupants from seeing the interior of the privacy display (2).

7. The headrest (4) or backrest according to any one of the preceding claims, wherein, - The cover or cover layer (6) is constructed in a prismatic shape to deflect the light beam (L) upwards, thereby vertically compressing the structural space required by the privacy display (2), and thus directing the light beam (L) directly toward the eye box (E); and -The prismatic cover or cover layer (6) preferably has a downwardly tapering shape that is at least approximately triangular in the vertical longitudinal section.

8. The headrest (4) or backrest according to any one of the preceding claims, wherein, - The projection and imaging optical system is designed to present the display content as a real image (R) suspended in the air between the cover plate or cover layer (6) and the eyepiece (E) in a real image plane or real image surface; and - The suspended real image plane or real image surface has a spatial orientation that is significantly deviated from the surface section (4a) and optimized for ergonomics when passengers view the real image (R).

9. A vehicle seat (1), particularly a vehicle seat for a motor vehicle (3), said vehicle seat comprising: -A headrest (4) or backrest according to any one of the preceding claims.

10. A means of transport (3), particularly a motor vehicle, said means of transport having mutually perpendicular longitudinal, lateral, and height directions (X, Y, Z) in a Cartesian coordinate system (K) fixed for the means of transport, said means of transport comprising: - The first vehicle seat (1) according to claim 9 and the second vehicle seat arranged behind it in the longitudinal direction (X) of the vehicle; -The privacy display (2) integrated into the headrest (4) or backrest of the first vehicle seat (1) is configured to present a real image (R) suspended between the first vehicle seat and the second vehicle seat to the passenger in the second vehicle seat; and - The cover or cover (6) of the privacy display (2) faces the passenger in the seat of the second vehicle and is preferably tilted from the vertical towards the vehicle floor at a predetermined angle.

Images