DE102019215877A1 - Motor vehicle - Google Patents

Abstract

A motor vehicle with a roof, a vehicle interior and a windshield, and with a display unit arranged on the inside of the roof and displaceable in a vehicle longitudinal direction at least between a first position and a second position, at least the second position being a viewing position, is characterized in that the display unit in the second position covers at least part of the windshield, which is arranged in front of a front seat as seen in the longitudinal direction of the vehicle.

Description

Motor vehicle with a roof, a vehicle interior and a windshield, and with a display unit which is arranged on an inner side of the roof and can assume at least a first configuration and a second configuration, the display unit being in a viewing position at least in the second configuration.

Such motor vehicles are known from the prior art. A large number of display units, displays or other display devices can be contained in a motor vehicle. As a rule, these are used for information purposes, but recently also increasingly for entertainment purposes. It is known, for example, to provide various types of screens for entertainment purposes, particularly for users who sit in the back seat of a vehicle. These screens can be arranged, for example, on the rear of the front seats or can be folded out of the roof lining.

The DE 10 2016 225 745 A1 discloses, for example, a motor vehicle with a screen which is arranged and fastened in a vehicle interior in the area of a vehicle roof inside. The screen extends continuously over at least half, preferably at least two thirds of the width of the inside of the vehicle roof. The screen can be arranged in a stowed position parallel to the vehicle roof. Furthermore, the screen can assume a useful position in which it is arranged vertically in the vehicle interior and can thus be viewed by a user. The screen can be transferred from one position to the other position by means of a swivel mechanism. Optionally, the screen can be mounted displaceably in the longitudinal direction of the vehicle. The screen is designed in such a way that all vehicle occupants always have a clear view through the windshield.

From the DE 10 2017 212 518 B3 a system for displaying a region of the surroundings of a vehicle which is at least partially behind the vehicle is known, the system having at least one display field for which two operating positions are provided, the at least one display field in a first operating position behind at least one Interior trim of an interior of the vehicle is arranged and covered by this, and wherein the interior trim delimits a windshield of the vehicle. In a second operating position, the display panel is arranged in a central upper area of the windshield and can thus be used as an interior mirror in conjunction with a rear-facing camera. The first operating position can be used in particular in an autonomously driving vehicle during a driving situation in which no intervention by the driver is necessary.

The known screens and display units are primarily designed for use by passengers, in particular in the rear of the motor vehicle, or for use as a source of information for the driver who is actively steering the vehicle. Since operating situations in which the driver does not actively steer the vehicle himself is to be expected in future autonomously driving vehicles, there is a need to provide a display unit that enables the driver to view entertaining and / or informational media. However, active steering of the vehicle by the driver should still be possible.

The object of the present invention is therefore to develop a display unit of the type mentioned at the beginning in such a way that it can also be used by the driver of a vehicle.

The object is achieved by a motor vehicle of the type described at the outset, in which the display unit in the second configuration covers at least part of the windshield, which is arranged in front of a front seat when viewed in the longitudinal direction of the vehicle and is not covered by the display unit in the first configuration. In the first configuration, on the other hand, the display unit preferably does not cover the windshield, so that in the first configuration the display unit accordingly preferably does not or at least not significantly impair the windshield field of view of the driver or front passenger or another user.

The driver in particular can concentrate on the area around the vehicle and on the traffic without any problems. If the vehicle is in an autonomous driving mode, this is not necessary, so that the driver and / or the front passenger do not have to rely on having an uninterrupted view of the surroundings. By contrast, the seating position of the driver or front passenger is designed as standard to look forward out of the vehicle through the windshield. The fact that the display unit at least partially or even completely covers the windshield in the second configuration means that the user does not have to change his seating position when, for example, from a manual driving mode to an autonomous driving mode by looking at the display on the display unit would like to change.

In the context of the present description, different configurations are in particular different states, the differ from one another with regard to the position and / or extent of the display unit, understood. For example, a first configuration can correspond to a first position and a second configuration can correspond to a second position. The two positions can be converted into one another by shifting the display unit, for example along a straight or curved line. The movement can, for example, also be a pivoting or folding movement. Features of the invention, which for the sake of simplicity are described below with reference to a specific position, can generally also be implemented in combination with other configurations, provided the combination is not obviously nonsensical. A change in the configuration in which, strictly speaking, the position of the display unit is not changed, can consist, for example, in a change in the size of the display unit.

The fact that a certain portion of the windshield is covered by the display unit in a certain configuration is understood in particular to mean that from a typical position of a user, for example from an area in which the eyes of a driver or front passenger are typically located while driving , the relevant area of the windshield is no longer visible due to the display unit. In a typical embodiment, the display unit covers the relevant area of the windshield in that it is arranged in the immediate vicinity of the inside of the windshield and essentially parallel to it.

According to a preferred embodiment, the display unit extends in the transverse direction of the vehicle over an area in which a middle third of a driver's seat or a front passenger's seat is arranged. In other words, the display unit is arranged in the direct field of vision of the driver or the passenger. The respective user can thereby view the display unit in a relaxed sitting position and with a natural head posture.

According to a development of the invention, the display unit extends at least in the second configuration over at least 80% of the width of the windshield, preferably over at least 90% of the width of the windshield and particularly preferably over the full width of the windshield. It is thus made possible that the driver and the front passenger as well as possibly other persons present in the vehicle can view the display unit at the same time. The display unit can extend from a left edge of the roof, as seen in the direction of travel, to a right edge of the roof. As an alternative or in addition, the display unit can also extend, viewed in the direction of travel, from a left edge of the windshield to a right edge of the windshield.

The display unit is preferably designed in such a way that it can assume a configuration in which it covers at least 80% of the extent of the windshield in the longitudinal direction of the vehicle, preferably at least 90% of the extent of the windshield in the longitudinal direction of the vehicle and particularly preferably the entire extent of the windshield in the longitudinal direction of the vehicle. On the one hand, this means that overall a large area of the display unit is available, which can either be divided into different areas, for example to display information and entertainment media at the same time, or as a single large display unit, for example to display audiovisual media, can be used. At the same time, it becomes possible to use the display unit effectively as a sun visor.

According to a development of the invention, the display unit is in the first configuration in a viewing position. In other words, the position of the display unit then corresponds in each case to a viewing position both in the first configuration of the display unit and in the second configuration of the display unit. The second position, that is to say the position of the display unit in the first configuration, can, as already stated, be designed so that it can be viewed in a seated position of the driver or the front passenger. The first position can be designed in such a way that it can be viewed by the driver or the front passenger in a lying position. The first position can preferably be configured in such a way that the display unit extends directly under the roof and parallel to it in the first position, the front edge, seen in the direction of travel, being arranged in the vicinity of the rear edge of the windshield, seen in the direction of travel. The rear edge of the windshield can also be referred to as the upper edge of the windshield.

When changing between the first configuration and the second configuration, the display unit can be moved. The path that the display unit describes during the shifting process can be straight or curved. The path that the display unit describes during the displacement process preferably runs at a minimal distance from the inside of the roof and from the inside of the windshield. In other words, the path that the display unit describes during the displacement process then follows the common contour formed by the inside of the roof and the inside of the windshield becomes. In certain embodiments, during the transition from the first configuration or position to the second configuration or position, an angle that a visible side of the display unit forms with the horizontal changes. In particular, this angle is increased by moving the display unit into the second position. When changing from the first configuration to the second configuration, there is a shift, i.e. a shift, in which the position of the display unit changes in the longitudinal direction of the vehicle, and in which the addressed angle also changes at the same time.

It is possible for two or more display units according to the invention to be present in a motor vehicle. The display unit can therefore also be designed in several parts. It is possible that a first portion of the display unit assigned to a driver's side of the motor vehicle can be displaced or transferred from the first configuration to the second configuration independently of a second portion of the display unit assigned to a passenger side of the motor vehicle. This makes it possible, for example, for the passenger to use the portion of the display unit assigned to him in the second position even during a manual operating mode, provided that the driver's field of vision is not restricted in a safety-relevant manner as a result. Of course, it is also possible for the nominal driver to use the portion of the display unit assigned to him during an autonomous journey in the second position, whereas the front passenger can simultaneously use the display unit in a lying position, i.e. in the first position, or alternatively not use the display unit at all uses.

The display unit preferably has a drive for displacing the display unit from the first position into the second position and vice versa. The drive can preferably be an electric motor drive. The user can then determine the position of the display unit with the aid of a simple control, for example with the aid of buttons, buttons or other operating elements that can be arranged, for example, on a touchscreen. The touchscreen can be the display unit itself or it can be part of another system of the motor vehicle.

Furthermore, the display unit can be positioned automatically depending on the operating mode. For example, it can be configured that the display unit or the display units are automatically moved into the second position when changing to an autonomous driving mode or, for example, also when the vehicle is parked and solar radiation is to be minimized. An automatic system can also be provided which quickly converts the display unit into a configuration or position in which the driver has a clear view through the windshield when a dangerous situation is detected. The display unit can also be transferred to such a configuration or position when an accident is detected.

According to a development of the invention, the motor vehicle has a control device for adapting a size and / or a position of an image displayed on the display unit. The size of the images and / or information presented on the display unit can then be varied depending on the distance of the user from the display unit and / or depending on the individual preference of the user. This setting can be made manually by a user, or, for example, automatic position recognition of the user, which can include, for example, position tracking of the user's eyes, can also be used.

The display unit is preferably designed in such a way that, in the second position, it extends essentially parallel to the roof and / or to the windshield. It is achieved in this way that the display unit takes up as little space as possible in the vehicle interior in the first position, that is to say in the normal case in the stowed position. The available height in the interior of the vehicle or the headroom for a user is thus maximized.

The display can be an active, self-illuminating display. In particular, it can be an LCD, LED or OLED display or some other configuration of a flat screen. The display unit can in particular be used in the first position in order to display ambient lighting or other decorative elements. It can also be provided that the display unit is controlled by a personal electronic device of a user, for example a smartphone or a portable computer. Use as flexible interior lighting is also conceivable.

It is also possible for the display unit to have a curvature modeled on an inner contour of the roof and / or an inner contour of the windshield. In this way, it is achieved that the display unit takes up as little space as possible in the vehicle interior, since it hugs the contour of the vehicle interior almost optimally. Furthermore, a corresponding curvature can be advantageous, since it is achieved in this way that the distances between different areas of the display unit from the eyes of the viewer are matched to one another. This can be done especially with the relatively short distances between viewer and display unit, as they are typically in one Motor vehicle, in particular in a passenger car, occur to be perceived as pleasant.

A simple way of shifting the position is achieved if the display unit is mounted in rails arranged on the side of the roof of the motor vehicle. These rails can, for example, be combined with an electric drive so that it is easier for the user to switch between the various positions of the display unit. In this case, one or more further positions can be provided in addition to or as intermediate stages between the first position and the second position of the display unit. It is also possible for the user to be able to shift the position of the display unit continuously between the first position, which in this case is a first limit position, and the second position, which is then a second limit position. As an alternative to an electric drive, a user can of course also move the display unit manually within the rails. For this purpose, for example, a handle can be arranged on the display unit.

According to a further development of the invention, the motor vehicle has rails mounted laterally on the roof of the motor vehicle, in which contacts are arranged for transmitting information to be displayed by the display unit to the display unit. Alternatively, the display unit can of course also receive the data to be displayed by means of a flexible cable or via a wireless data connection.

A special embodiment of the invention is characterized by rails which can be extended along the windshield and in which the display unit can be displaced along the windshield. The rails can optionally be extended at the same time as the display unit. In this embodiment it is not necessary to arrange stationary rails at the edge of the windshield, which rails are also visible when the display unit is in a stowed position.

It is also possible for rails to be present which can be extended along the windshield and in which the display unit can be displaced along the windshield, the rails being supported in a fully extended position on an interior structure of the motor vehicle. The extended rails are stabilized by a counter bearing so that the construction can be made slimmer, especially in the upper area of the windshield and in the roof area, since not all the forces that arise have to be introduced into the roof structure via the rails. Instead, a portion of the forces can be introduced into the interior structure mentioned. The interior structure can be, for example, an instrument panel or a center console of the motor vehicle.

An alternative embodiment of the invention is characterized in that the display unit is a roll-up projection surface. In other words, the display unit can then be rolled up in the manner of a roller blind.

The motor vehicle then preferably has at least one projector for projecting an image onto the display unit. Such a construction can be used flexibly and can be integrated into a motor vehicle at low cost. As a rule, only a few components are necessary, for example rails or another displacement mechanism are not absolutely necessary, but can be used, for example, to adjust a curvature or curvature of the projection surface.

Of course, it is also possible to use a projector in conjunction with a rigid display unit that cannot be rolled up. The display unit can then have a plane or curved surface which is suitable for projecting an image onto it.

Alternatively, the rollable flexible projection surface can be a rollable display, which consequently represents a rollable flat screen.

If the roll-up unit is arranged, for example, on the upper edge of the windshield, the flexible projection surface can be rolled out in the direction of the lower or front edge of the windshield and fixed there, for example hooked. It is conceivable to provide several fixing options so that the flexible projection surface can be fixed in one or more intermediate stages. If there are lateral guide rails, there can also be a stepless fixing mechanism that allows the flexible projection surface to be fixed in any position.

Alternatively or additionally, it may be possible to roll out the same projection surface in the direction of the rear of the motor vehicle so that it can be viewed, for example, by passengers on a rear seat bench and / or by a driver and / or front passenger who use their seat in a reclining position .

For this purpose, a projector can, for example, be in a center console of the motor vehicle or in be arranged on an instrument panel of the motor vehicle.

• 1: ein erstes Ausführungsbeispiel eines erfindungsgemäßen Kraftfahrzeugs in einer schematischen Seitenansicht,
• 2: ein zweites Ausführungsbeispiel eines erfindungsgemäßen Kraftfahrzeugs in einer schematischen Seitenansicht,
• 3: ein drittes Ausführungsbeispiel eines erfindungsgemäßen Kraftfahrzeugs in einer schematischen Seitenansicht,
• 4: eine schematische Draufsicht auf ein viertes Ausführungsbeispiel eines erfindungsgemäßen Kraftfahrzeugs, und
• 5: ein Ausführungsbeispiel eines Fahrzeuginnenraums 51 eines erfindungsgemäßen Fahrzeugs in einer schematischen Draufsicht.

Embodiments of the invention are explained in more detail with reference to the drawings and the following description. Show it:

• 1 : a first embodiment of a motor vehicle according to the invention in a schematic side view,
• 2 : a second embodiment of a motor vehicle according to the invention in a schematic side view,
• 3 : a third embodiment of a motor vehicle according to the invention in a schematic side view,
• 4th : a schematic plan view of a fourth embodiment of a motor vehicle according to the invention, and
• 5 : an embodiment of a vehicle interior 51 of a vehicle according to the invention in a schematic plan view.

1 shows a first embodiment of a motor vehicle according to the invention 2 in a schematic side view. The vehicle 2 has a windshield 4th and a roof 6th on. Inside the vehicle 2 there is a driver 8th as well as a passenger 10 which is in a back seat. Furthermore, the display is 12th shown in a first position, which corresponds to a stowage position. The display is in this position 12th directly below the front part 16 of the roof 12th and above the driver's head 8th arranged. The windshield 4th remains free, so that the driver's field of vision 8th is not affected.

By the arrow 20th the displacement movement of the display is indicated 12th or. 14th coming out of the stowed position 12th in the viewing position 14th relocate. the display 12th or. 14th is shown in two different positions at the same time, although in reality, of course, only one position 12th or 14th can be taken at the same time. In the viewing position 14th the display covers a considerable part of the windshield 4th so the driver 8th and possibly also the passenger (not shown) the display problem-free 14th without having to change their position or line of sight.

The back of the roof 18th will be both in the first position 12th as well as in the second position 14th not covered by the display. The display unit or the display can, however, be designed in such a way that a further position can be assumed, which for example also includes a rear part of the roof 18th covered so that the passenger too 10 can use the display. For this it can be advantageous if the passenger 10 brings his seat to a reclining position.

The change between the first position 12th and the second position 14th can for example with the help of a control device 22nd by operating a control element 24 what can be a switch or button, for example. The one on the display unit 12th or. 14th Information or images to be displayed can, for example, come from the control device 22nd to be provided.

2 shows a second embodiment of a motor vehicle according to the invention 2 in a schematic side view. In contrast to the first exemplary embodiment, there is a first projector here 26th and a second projector 28 present, the images on the display 12th or. 14th can project. In particular are the projectors 26th , 28 suitable to put an image on the display that is in the viewing position 14th located to project. It is not necessary that both the first projector 26th as well as the second projector 28 available. Embodiments are possible in which only either the first projector 26th or the second projector 28 is available. The first projector 26th is in a front area of the motor vehicle 2 arranged in a center console, not shown. An alternative position for the first projector 26th can be located in the instrument panel, also not shown. The second projector 28 is also located in the center console, not shown, but in the area of the rear seats.

3 shows a third embodiment of a motor vehicle according to the invention 2 in a schematic side view. In this case, the display unit consists of a screen 30th that can be extended or pulled out like a roller blind. This is again indicated by the arrow 20th shown. The canvas is in the rest or stowed position 30th completely on one axis 32 wound up. The axis 32 is in the illustrated embodiment above the head of the driver 8th arranged and extends transversely to the direction of travel. The canvas 30th can be rolled out forwards as seen in the direction of travel and, for example, at a first fastening point 34 or at a second attachment point 36 be hooked. The attachment point 34 , 36 can, for example, be attached to an A-pillar of the vehicle 2 be arranged. When the canvas 30th at the first attachment point 34 when hooked, it only covers part of the windshield 4th . The second attachment point 36 however, is in the area of the lower edge of the windshield 4th arranged so that the canvas 30th when they are in the second attachment point 36 is hooked in Essentially the entire windshield 4th covers. The canvas 30th can be designed to be opaque so that it can function as a sun protection blind or a sun visor at the same time. A simple design option provides that an existing sun protection blind is extended and, if necessary, designed or coated in such a way that it is suitable as a screen for projecting an image.

At the back of the roof 18th is a third attachment point 38 located above the head of the passenger 10 is located. Starting from the axis 32 the roller blind can also be directed towards the rear of the vehicle 2 pulled out and at the third attachment point 38 be hooked. The illustrated embodiment can also be done with the projectors 26th , 28 from the second embodiment are combined so that, for example, a projector for displaying an image on the screen 30th when the canvas 30th is in a viewing position in which they are in the first attachment point 34 or the second attachment point 36 is hooked, and a second projector for displaying an image on the screen 30th when the canvas 30th is in a viewing position in which they are in the third attachment point 38 is hooked, is present.

The attachment points 34 , 36 , 38 can do this at the same time both on the left edge of the roof 6th as well as on the right edge of the roof 6th be arranged so that the canvas 30th symmetrical on both sides of the vehicle 2 can be set.

4th shows a schematic plan view of a fourth embodiment of a motor vehicle according to the invention, with only the windshield 4th as well as the display unit 46 , 48 and the associated components are shown. The display unit 46 , 48 is divided into two parts, with the proportion of the display unit 46 is assigned to the driver's side, and wherein the proportion of the display unit 48 assigned to the passenger side. The two parts of the display unit 46 , 48 be from a first rail 40 , a second rail 42 and a third rail 48 carried. These each extend in a partial area over the windshield 4th and in a further partial area shown in the figure in the upper area, over the roof of the motor vehicle, which is not shown 2 .

The two parts of the display unit 46 , 48 can independently in the rails 40 , 42 , 44 be moved. The display unit assigned to the driver's side is in the situation shown 46 in a stowed position so that the windshield is in the driver's area 4th is completely free and the display 46 does not impair the driver's field of vision. The display unit assigned to the passenger side 48 however, is in a viewing position in which it is part of the windshield 4th covered.

There is also a drive unit 50 shown, which is the display unit 46 , 48 can drive and relocate. The drive unit 50 can, as shown, be arranged in the area of the roof of the motor vehicle, but in principle it can also be inside or in the vicinity of the rails 40 , 42 , 44 be arranged. The drive unit 50 can for example be an electric motor or comprise several electric motors.

Alternative embodiments can be on the middle rail 42 waive, whereby then in the normal case, however, only a single display unit, which covers both the driver area and the passenger area, can be held. It is also possible that the rails 40 , 42 , 44 together or separately with the display units 46 , 48 moved or extended.

5 shows an embodiment of a vehicle interior 51 of a vehicle according to the invention in a schematic plan view. The driver's seat is shown 52 , the passenger seat 54 who have favourited the back seat 56 , an instrument panel 58 as well as a center console 60 . There is also a first projector 26th and a second projector 28 shown. The first projector 26th is in the middle of the instrument panel, seen in the transverse direction of the vehicle 58 arranged and radiates upwards or diagonally upwards, so that a display unit, not shown, can be acted upon with a projected image.

The second projector 28 is located further back in the vehicle, more precisely in the area of the rear passengers. It is also in the center of the center console when viewed in the transverse direction of the vehicle 60 arranged. The second projector too 28 radiates upwards or obliquely upwards, so that a display unit (not shown) can be acted upon with a projected image. Optionally and in particular if the display unit should only be visible to the driver, for example, the first projector can be used 26th also eccentrically viewed over the entire width of the vehicle, for example in the middle in front of the driver's seat 52 in the instrument panel 58 be arranged. The first projector can do the same 26th or another projector in the middle in front of the passenger seat 54 in the instrument panel 58 be arranged.

List of reference symbols

2

vehicle

4th

Windshield

6th

top, roof

8th

driver

10

passenger

12th

Display in stowed position

14th

Display in view position

16

front part of the roof

18th

rear part of the roof

20th

arrow

22nd

Control unit

24

Control element

26th

first projector

28

second projector

30th

canvas

32

axis

34

first attachment point

36

second attachment point

38

third attachment point

40

first rail

42

second rail

44

third rail

46

Driver's side display

48

Display on the passenger side

50

Motor unit

51

inner space

52

Driver's seat

54

Passenger seat

56

Back seat

58

dashboard

60

Center console

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016225745 A1 [0003]
• DE 102017212518 B3 [0004]

Claims (11)

Motor vehicle (2) with a roof (6), a vehicle interior (51) and a windshield (4), and with a display unit (12, 14, 46, 48) arranged on the inside of the roof, the at least a first configuration and a second configuration can take, wherein the display unit (12, 14, 46, 48) is at least in the second configuration in a viewing position, characterized in that the display unit (12, 14, 46, 48) in the second configuration at least part of the windshield (4), which is arranged in front of a front seat (52, 54) as seen in the longitudinal direction of the vehicle and is not covered by the display unit (12, 14, 46, 48) in the first configuration. Motor vehicle (2) according to the preceding claim, characterized in that the display unit (12, 14, 46, 48), viewed in a transverse direction of the vehicle, extends over an area in which a middle third of a driver's seat (52) or a passenger seat (54) is arranged. Motor vehicle (2) according to one of the preceding claims, characterized in that the display unit (12, 14, 46, 48) is at least in the second configuration over at least 80% of the width of the windshield (4), preferably over at least 90% of the width the windshield (4) and particularly preferably over the full width of the windshield (4). Motor vehicle (2) according to one of the preceding claims, characterized in that the display unit (12, 14, 46, 48) can assume a configuration in which it is at least 80% of the extent of the windshield (4) in the longitudinal direction of the vehicle, preferably at least 90%. the extent of the windshield (4) in the longitudinal direction of the vehicle and particularly preferably the entire extent of the windshield (4) in the longitudinal direction of the vehicle. Motor vehicle (2) according to one of the preceding claims, characterized in that the display unit (12, 14, 46, 48) is in the first configuration in a viewing position. Motor vehicle (2) according to one of the preceding claims, characterized in that a first portion of the display unit (46) assigned to a driver's side of the motor vehicle (2) is independent of a second portion of the display unit (48) assigned to a passenger side of the motor vehicle (2) is relocatable. Motor vehicle (2) according to one of the preceding claims, characterized in that the display unit (12, 14, 46, 48) extends in the second position essentially parallel to the roof (6) and / or to the windshield (4). Motor vehicle (2) according to one of the preceding claims, characterized in that the display unit (12, 14, 46, 48) has a curvature modeled on an inner contour of the roof (6) and / or an inner contour of the windshield (4). Motor vehicle (2) according to one of the preceding claims, characterized by rails (40, 42, 44) which can be extended along the windshield and in which the display unit (12, 14, 46, 48) can be displaced along the windshield, wherein the rails (40, 42, 44) are supported in a fully extended position on an interior structure (58, 60) of the motor vehicle (2). Motor vehicle (2) according to one of the preceding claims, characterized in that the display unit (12, 14, 46, 48) is a roll-up projection surface. Motor vehicle (2) according to one of the preceding claims, characterized in that the display unit (12, 14, 46, 48) is a roll-up display.

Images