Display system with a field of view display device for a high-contrast display in a vehicle

Abstract

The invention relates to a sun visor arrangement for arrangement on a roof lining of a motor vehicle, comprising: - an adjustable sun visor blade arranged on the roof lining of the motor vehicle via a first folding hinge, - a transparent screen with a polarizing filter, and - an adjustment device arranged on or in the sun visor blade for adjusting the screen between a parking position and a use position; wherein in the parking position the screen is arranged outside the field of vision of a vehicle occupant and in the use position the screen is arranged between a surface of the windscreen and an eye area of ​​the vehicle occupant.

Description

[0001] The invention relates to a display system with a field-of-view display device for use in a vehicle. The invention further relates to measures for improving image perception even in bright vehicle environments.

[0002] Head-up display devices are also known as “head-up displays” and are used to project a display image into the field of vision of at least one vehicle occupant by reflecting an image-bearing light beam on a reflective surface that forms part of the windscreen or a combiner screen arranged in front of it on the inside of the vehicle.

[0003] Furthermore, field-of-view display devices designed for panoramic display in a motor vehicle are known, with which large-area display devices, for example for providing displays for entertainment or video communication, can be displayed or perceived via reflection on the windshield. The displayed image is often reflected in a lower area of ​​the windshield, which can be designed as a black print area. To enlarge the image display area, it is necessary to use the field-of-view display device to also display an image in an area of ​​the windshield that lies above the black print area and is therefore transparent.

[0004] However, these display images overlay the perception of the vehicle's surroundings through the corresponding transparent area of ​​the windshield. However, in strong ambient light, the display images are not always sufficiently contrasty or bright enough to provide a full viewing experience for vehicle occupants. Depending on the ambient brightness, this can significantly disrupt the perception of the displayed image, as sufficient contrast cannot be achieved. Even without a field-of-view display device, reflected sunlight or scattered atmospheric light can dazzle the driver.

[0005] To solve this problem, US 2022 / 0187602 A1, for example, proposes a head-up display system in which a polarization-rotating optical layer is provided in the windshield of an aircraft or vehicle, which serves to reflect the HUD light to the pilot or driver. This layer always rotates the linear polarization of the light transmitted through the windshield by 90°, so that p-polarized light components become s-polarized light components, and vice versa. In combination with an appropriate polarization filter and / or additional polarization rotators in the beam path of the s-polarized HUD light reflected from the windshield, the s-polarized glare from outside can be blocked, allowing the HUD light to reach the viewer's eye with virtually no loss.

[0006] It is therefore an object of the present invention to provide an arrangement for a display system with a field of view display device with which it is possible to use a large area of ​​the windscreen to display a display image without the display contrast and perceptibility being impaired by high ambient brightness.

[0007] This object is achieved by a sun visor arrangement for a motor vehicle according to claim 1 and the display system with a field of view display device according to the independent claim.

[0008] Further embodiments are specified in the dependent claims.

[0009] According to a first aspect, a sun visor arrangement for arrangement on a roof lining of a motor vehicle is provided, comprising: - an adjustable sun visor blade arranged on the roof lining of the motor vehicle via a first folding hinge, - a transparent screen with a first polarization filter, and - an adjusting device arranged on or in the sun visor blade for adjusting the transparent screen between a parking position and a use position; wherein in the parking position the screen is arranged outside the field of vision of a vehicle occupant and in the use position the screen is arranged between a surface of the windscreen or a combiner screen, in particular a reflective surface, and an eye area of ​​the vehicle occupant.

[0010] According to a further aspect, a display system for a motor vehicle is provided, comprising: - a windscreen of the motor vehicle with a second polarisation filter; - a display device for emitting an image-bearing display light, - a reflective surface provided on the windscreen or a separate combiner screen to reflect the image-bearing display light into an eye area of ​​a vehicle occupant; - the above sun visor arrangement.

[0011] It can be provided that the second polarization filter has a second polarization direction, in particular a p-polarization, and the first polarization filter of the screen in the position of use has a first polarization direction perpendicular to the second.

[0012] The above sun visor assembly provides that a position-adjustable screen is arranged on an adjustable sun visor blade of a sun visor in a vehicle. The screen is transparent and formed with a first polarization filter so that vertically polarized light cannot transmit thereto. The screen is adjustable between a use position and a parked position. In the parked position, the screen is preferably arranged on the sun visor blade such that it rests against it or is received therein. The sun visor blade corresponds to the foldable part of a known sun visor for shielding outside light in an upper part of a windshield.

[0013] By positioning the adjustable shade on or within the sun visor blade, it is possible to park the shade in a position where it is not needed, making it virtually invisible within the vehicle interior. The conventional use of the sun visor to shield from sunlight from a low sun can also be continued unhindered by folding or pivoting the sun visor blade forward in front of the upper part of the windshield.

[0014] When the screen is moved into the use position, preferably by first pivoting the sun visor blade downwards and then moving the screen into the use position, the position and orientation of the screen is such that the lower area of ​​the windscreen can only be seen through the screen.

[0015] By providing a second polarization filter in or on the windscreen, at least in the area of ​​the reflection surface or the area over which the display image is to be perceived, with a polarization direction perpendicular to the first polarization filter in the screen in its use position, ambient light directed through the windscreen and the screen into the eye area of ​​the vehicle occupant can be almost completely blocked. Thus, display images output via a display device, which are reflected on an inner side of the windscreen or on a combiner surface arranged on the inside, can be displayed on a corresponding display area or reflection area and perceived against a dark background.

[0016] The image-outputting field of view display device can be designed using a projection system as in the conventional head-up display or can be designed merely by reflection of an active display device that is arranged substantially horizontally on the dashboard (panoramic HUD).

[0017] Furthermore, the umbrella can be arranged with a second folding hinge, in particular on an edge opposite the first folding hinge, in order to fold the umbrella completely onto the sun visor blade, so that the sun visor blade including the umbrella can be pivoted onto the roof lining in the parking position.

[0018] The adjustable shade can thus be arranged, in particular, on the underside of the sun visor blade using at least one folding hinge as a possible adjustment mechanism and can be folded onto the sun visor blade in a parked position. In the parked position, the shade is then preferably arranged between the sun visor blade and the roof lining and is thus completely invisible.

[0019] It may be provided that the folding hinges are self-locking and have a folding resistance in order to hold the sun visor blade and the screen in an adjustment position.

[0020] Alternatively, the adjustment device can be provided as a receiving device which is designed as a pocket in the sun visor blade into which the screen can be inserted.

[0021] Alternatively, the umbrella can also be inserted into the sun visor blade using a sliding mechanism as an adjustment device and pulled downwards out of the sun visor blade when in use.

[0022] According to one embodiment, the screen may be provided with an s-polarizing first polarization filter.

[0023] According to one embodiment, the screen can be anti-reflective on one or both sides.

[0024] According to a further aspect, a motor vehicle with the above display system is provided.

[0025] The adjustment mechanism allows the screen to be aligned with the lower edge of the sun visor blade when in use, positioning it within the field of vision between the vehicle occupant's eye area and the reflective area or display area on the windshield or combiner screen. The adjustment mechanism or the folding feature of the sun visor itself allows manual positioning of the screen, allowing the display area of ​​the windshield to be adjusted for viewing the image.

[0026] Because the sun visor can be used essentially unhindered by the umbrella, the shielding effect of the sun visor against direct sunlight is retained.

[0027] Furthermore, the second polarization filter of the windscreen can extend over an entire windscreen surface or at least over the surface section thereof to be arranged in the field of vision of a driver and / or at least one other vehicle occupant, in particular a front passenger, wherein the second polarization filter is designed to substantially completely reflect or block horizontally or s-polarized visible light which is incident on the windscreen from outside the vehicle in a predetermined flat angle range which deviates significantly from its normal direction and which includes at least angles of incidence of the glare due to reflective horizontal surfaces in front of the vehicle, and to substantially completely transmit vertically or p-polarized light.In particular, the said flat angle range can be defined as an angular range starting from the normal direction of the windscreen in the vertical downwards, wherein the angular range lies between 40° and 80°, preferably between 55° and 75°, particularly preferably between 60° and 70°.

[0028] Embodiments of the invention are explained in more detail below with reference to the accompanying drawings. They show: Fig. 1 is a cross-sectional view of a vehicle with a display system for a field of view display device and a sun visor arrangement; Fig. 2 is a perspective sectional view of a vehicle with a display system for a field of vision display device and a sun visor arrangement; and Fig. 3 a cross-sectional view of another embodiment of the sun visor arrangement.

[0029] Fig. 1 shows a highly simplified vertical longitudinal section of a section of a vehicle 1 with a windshield 2 according to an embodiment of the invention. The spatial orientation terms used below, such as "horizontal", "vertical", "above", "below", "beneath", etc., refer to the usual vehicle-fixed Cartesian coordinate system with mutually perpendicular longitudinal, transverse and vertical directions of the vehicle 1. The vehicle 1 in this example is a motor vehicle that is Fig. 1 is only indicated by its windscreen 2 and the roof lining 13. Fig. 2 shows the vehicle in a perspective sectional view.

[0030] In the display system, the windshield 2 comprises at least one pane 3, which may be a single pane or a composite pane, and a p-polarizing second polarization filter 4 formed thereon on the vehicle interior, which may, for example, extend over the entire windshield surface in order to significantly reduce glare, at least from natural glare sources, in the field of vision of the driver or other passengers. For this purpose, the second polarization filter 4 is designed to reflect or otherwise block at least 90% of horizontally or s-polarized visible light incident on the windshield 2 from outside the vehicle 1 in a predetermined flat angle range that deviates significantly from its normal direction N, which includes at least the angle of incidence of the glare 6 from shiny horizontal surfaces in front of the vehicle 1, and to transmit at least 40% to 80% of vertically or p-polarized light.The said flat angle range for the angle of incidence can be determined as an angular range starting from the normal direction of the windscreen in the vertical downwards, wherein the angular range is between 40° and 80°, preferably between 55° and 75°, particularly preferably between 60° and 70°.

[0031] With this configuration, the second polarization filter 4 can filter out not only predominantly s-polarized glare 6 from puddles and similar glossy surfaces in front of the vehicle 1, but also a significant portion of the direct glare 7 from a low-lying sun and predominantly s-polarized atmospheric scattered light 5. As a result, only predominantly p-polarized exterior light 8 reaches the eyes 9 of the occupants through the windshield 2 in this angle of incidence range, which leads to a significant increase in contrast and saturation when viewing the outside world through the windshield 2.

[0032] Furthermore, the front screen 2 can serve as a reflection surface of a field of view display device.

[0033] The field of view display device can be configured with a display device 10, for example a display, which is arranged with a display surface below the windshield 2 on the instrument panel 15 of the vehicle 1. The display image of the display device 10 is then reflected on the reflection surface R of the windshield 2 such that a vehicle occupant can perceive the display image. The field of view display device can thus be designed, in particular, for a panoramic virtual display by using the windshield 2, with almost its entire extension in the transverse direction of the vehicle, as its reflection surface R. This is purely an example of a head-up display (HUD).The display device 10 is designed and arranged such that, during operation, it generates a light beam L with the desired display content and outputs it in a predetermined shape and direction to the windscreen 2, from which it is reflected at the reflection surface R to the eyes 9 of the relevant occupant in order to show him the display image.

[0034] The field of view display device may alternatively be designed with a projection display device to project a virtual display image directly into the eyes of the vehicle occupant via a reflection on the reflection surface R.

[0035] The field of view display device is designed to generate a display image in the field of view of at least one vehicle occupant whose eyes 9 are located in a predetermined spatial area in the passenger compartment of the vehicle 1. This can be, for example, a driver or a passenger of the vehicle 1, or both.

[0036] Furthermore, the display system can comprise a sun visor assembly 20. The sun visor assembly 20 has a sun visor blade 21 and a transparent screen 22, which is arranged on the sun visor blade 21 by means of an adjustment device 23. This allows the screen 22 to be adjusted between a parked position, in which it is virtually invisible, and a use position, in which it is arranged between the reflective surface on the windshield 2 and the eyes of the vehicle occupant. In particular, the screen 22 can be arranged in a space-saving parked position or in a use position close to the head of the vehicle occupant in question. The screen 22 can also be anti-reflective on the head side or on both sides to minimize light reflections from the surroundings.

[0037] The transparent screen 22 can be provided with an s-polarizing first polarization filter 26. The screen 22 can thereby reflect or block vertically or p-polarized light essentially completely, i.e., for example, at least 70, 80, or ideally 90%. In conjunction with the second polarization filter 4 in the windscreen 2, the perception of the display image can be enhanced, since the background brightness of the vehicle surroundings cannot be perceived by the vehicle occupant due to the mutually perpendicularly polarizing first and second polarization filters 26, 4 in the screen 22 and in the windscreen 2.

[0038] Since the sun visor blade of a conventional sun visor generally only covers an upper area at the edge of the windshield 2 in the use position, provision is made for the screen 22 to be arranged on the vehicle's regular sun visor in a foldable or otherwise extendable or adjustable manner. This allows the screen 22 to adjoin the lower edge of the sun visor blade 21 in the use position, so that the screen 22 is arranged between the eye area 9 of the vehicle occupant and the reflective surface on the windshield 2 or the combiner surface. As a result, the vehicle occupant perceives the area of ​​the screen 22 as almost completely black and can only see the display image, the light of which is not polarized or at least not polarized perpendicular to the polarization direction of the first polarization filter 26.This significantly improves the contrast of the displayed image and also reduces glare from the area surrounding the virtual image.

[0039] Fig. 1 schematically shows an embodiment of the sun visor assembly 20. It can be seen that the sun visor blade 21 is arranged on the roof lining via a first folding hinge 23. On the side of the sun visor blade 21 opposite the first folding hinge 23, i.e., on its lower edge in the use position, a second folding hinge 24 is arranged as an adjustment device that holds the shade 22 adjustable. The second folding hinge 24 makes it possible to fold the shade 22 completely onto the sun visor blade 21 and to pivot the sun visor blade, including the shade 22, against the roof lining in the parked position.

[0040] In the use position, the sun visor blade 21 can be folded toward the windshield 2 to ensure the conventional function of shielding from direct sunlight. The screen 22 can now be folded downward from the sun visor blade 21, thus extending the surface of the sun visor assembly 20 downward, so that the screen 22 reaches the area between the eye area 9 of the vehicle occupants and the reflective surface R on the windshield 2 or the combiner screen.

[0041] By variably tilting the sun visor blade 21 via the first folding hinge 23 and the screen 22 at the lower edge of the sun visor blade 21, the screen 22 can be positioned as desired. For this purpose, the folding hinges 23, 24 are preferably self-locking and have sufficient folding resistance to hold the sun visor blade 21 and the screen 22 in a variable position.

[0042] An alternative embodiment of a sun visor assembly 20' is shown by way of example in Fig.3. Reference numerals of identical elements or elements with identical functions are identified by "'". The sun visor arrangement 20' has a receiving device 25 as part of the adjustment device, which is designed as a pocket in the sun visor blade 21'. By pulling out the screen 22', the sun visor arrangement 20' can be extended downwards in a use position and then performs the function described above. Adjustment of the sun visor arrangement 20' is then still possible by folding it about the first folding hinge 23'. By pushing the screen 22' into the sun visor blade 21, the screen 22' becomes invisible and the sun visor can be used as usual. In particular, the surfaces of the sun visor blade 21' remain unaffected and can, for example, be provided on the inside with a vanity mirror or the like.

[0043] Even if the front panel 2 has the reflection surface R, the reflection surface R can also be provided on an additional combiner panel. The second polarization filter 4 then remains arranged in the front panel 2. List of reference symbols 1 vehicle 2 windshield 3 slices 4 second polarization filter 5 atmospheric scattered light 6 Glare 7 direct glare 8 p-polarized outside light 9 Eye area 10 Display device 13 Headliner N Normal direction R Reflection surface 20, 20' sun visor arrangement 21, 21' sun visor blade 22, 22' transparent umbrella 23, 23' first folding hinge 24 second folding hinge 25 Recording device 26 first polarization filter QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 2022 / 0187602 A1

[0005]

Claims

[1] Sun visor arrangement (20, 20') for arrangement on a roof lining (13) of a motor vehicle, comprising: - an adjustable sun visor blade (21, 21') which is arranged on the roof lining of the motor vehicle via a first folding hinge (23), - a transparent screen (22, 22') with a first polarization filter (26), and - an adjusting device (23, 24, 25) arranged on or in the sun visor blade (21) for adjusting the screen (22, 22') between a parking position and a use position; wherein in the parking position the screen (22, 22') is arranged outside the field of vision of a vehicle occupant and in the use position the screen (22, 22') is arranged between a surface of the windscreen (2) and an eye area (9) of the vehicle occupant. [2] Sun visor arrangement (20) according to claim 1, wherein the screen (22) is arranged with a second folding hinge (24) on an edge opposite the first folding hinge (23) in order to fold the screen (22) completely onto the sun visor blade 21, so that the sun visor blade (21) including the screen (22) can be pivoted to the roof lining (13) in the parking position. [3] Sun visor arrangement (20') according to one of claims 1 to 2, wherein the adjusting device (23', 25) has a receiving device (25) which is designed as a pocket in the sun visor blade (21') into which the screen (22') can be inserted. [4] Sun visor arrangement (20, 20') according to one of claims 1 to 3, wherein the folding hinge (23) or the folding hinges (23, 24) are self-locking and provided with a folding resistance in order to hold the sun visor blade (21, 21') and the screen (22, 22') in an adjustment position, respectively. [5] Sun visor assembly (20, 20') according to one of claims 1 to 4, wherein the screen (22, 22') is provided with an s-polarizing first polarization filter (26). [6] Sun visor arrangement (20, 20') according to one of claims 1 to 5, wherein the screen (22, 22') is anti-reflective on one side or on both sides. [7] A display system for a motor vehicle, comprising: - a windscreen (2) of the motor vehicle with a second polarization filter (4); - a display device (10) for outputting an image-bearing display light, - a reflection surface (R) provided on the windscreen (2) or a separate combiner screen to reflect the image-bearing display light into an eye area (9) of a vehicle occupant; - the sun visor arrangement (20, 20') according to one of claims 1 to 6. [8] Display system according to claim 7, wherein the second polarization filter (4) has a second polarization direction, in particular a p-polarization, and the first polarization filter of the screen (22, 22') in the position of use has a first polarization direction perpendicular to the first. [9] Display system according to claim 7 or 8, wherein the second polarization filter (4) extends over an entire windscreen surface or at least over the surface section thereof to be arranged in the field of vision of a driver and / or at least one other vehicle occupant, in particular a front passenger; wherein the second polarization filter (4) is designed to substantially completely reflect or block horizontally or s-polarized visible light which is incident on the windscreen (2) from outside the vehicle (1) in a predetermined flat angle range which deviates significantly from its normal direction (N), which range includes at least angles of incidence of the glare light (6) due to reflective horizontal surfaces in front of the vehicle (1), and to substantially completely transmit vertically or p-polarized light. [10] Display system according to claim 9, wherein said flat angle range is defined as an angular range starting from the normal direction (N) of the front panel (2) in the vertical downwards, wherein the angular range is between 40° and 80°, preferably between 55° and 75°, particularly preferably between 60° and 70°. [11] Vehicle (1), in particular a motor vehicle, comprising a display system according to one of claims 8 to 10.

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