Imaging unit, especially for a head-up display, with a light source carrier plate which is in thermally conductive contact with a housing partition wall.

Abstract

An imaging unit (18), a head-up display with at least one imaging unit (18), and a vehicle with at least one head-up display are described. The imaging unit (18) comprises at least one display (24) and at least one backlighting device (26) for the at least one display (24). The imaging unit (18) has a housing (30) in which at least a part of the at least one backlighting device (26) is arranged. The at least one backlighting device (26) has at least one light source carrier plate (44) and at least one light source (58) arranged on one of the extended sides of the at least one light source carrier plate (44). The housing (30) has at least one intermediate wall (50) against which the at least one light source carrier plate (44) thermally contacts.The at least one light source support plate (44) rests with its extended side, on which the at least one light source (58) is arranged, against the at least one housing partition (50). The at least one housing partition (50) has at least one light transmission opening (56) which is assigned to the at least one light source (58).

Description

Technical field The invention relates to an imaging unit, in particular an imaging unit for a head-up display, in particular for a black panel head-up display, in particular for a vehicle, with at least one display and with at least one backlighting device for the at least one display. Furthermore, the invention relates to a head-up display, in particular a head-up display for a vehicle, in particular a black-panel head-up display, with at least one imaging unit comprising at least one display, at least one backlighting device for the at least one display and at least one projection surface. Furthermore, the invention relates to a vehicle with at least one head-up display, in particular at least one black-panel head-up display, with at least one imaging unit comprising at least one display, at least one backlighting device for the at least one display and at least one projection surface. State of the art A head-up display (HUD) for a vehicle, as commonly found on the market, projects important information for the driver with exceptionally high light intensity onto a specially coated, black-printed surface at the bottom of the windshield. Head-up displays are known to have an imaging unit that generates images containing information. These imaging units typically include a display and a backlight for the display. The display is responsible for generating the images. The exceptionally high light intensity of the head-up display, as known from the market, requires a correspondingly strong backlight. This results in a high heat generation during operation of the head-up display. The object of the invention is to design an imaging unit, a head-up display and a vehicle of the type mentioned above, in which improved heat dissipation can be achieved while maintaining a compact design. Disclosure of the invention The object of the invention is achieved in that the imaging unit has a housing in which at least a part of the at least one backlighting device is arranged, the at least one backlighting device has at least one light source support plate and at least one light source which is arranged on one of the extended sides of the at least one light source support plate, the housing has at least one intermediate wall on which the at least one light source support plate thermally abuts, wherein the at least one light source support plate has at least one extended side on which the at least one intermediate wall abuts, and wherein the at least one intermediate wall has at least one light passage which is assigned to the at least one light source. According to the invention, the at least one backlighting device comprises at least one light source support plate. At least one light source is arranged on one of the extended sides of the at least one light source support plate. In this way, the at least one light source is held on the at least one light source support plate. The light source support plate has two opposite extended sides whose dimensions are greater than the thickness of the light source support plate. Advantageously, at least one light source can be attached to at least one light source mounting plate. In this way, at least one light source is securely fixed to the light source mounting plate. Advantageously, at least one light source can be electrically contacted on at least one light source mounting plate. In this way, at least one light source can be supplied with electrical energy. The housing has at least one partition wall. Advantageously, this partition wall can divide the housing into at least two chambers. In this way, the chambers can perform different functions separately. Advantageously, the at least one housing partition can divide the housing into a component chamber and an illumination chamber. Components, in particular electronic and / or electrical components, and / or the at least one light source mounting plate can be arranged in the component chamber. Light generated by the at least one light source of the backlighting device can propagate through the illumination chamber to illuminate the at least one display. Advantageously, at least one display can be positioned with its back side adjacent to the illumination chamber. In this way, the back of the at least one display can be illuminated by light from the illumination chamber. The at least one light source support plate rests against the at least one housing partition wall with the extended side on which the at least one light source is arranged. In this way, heat generated by the at least one light source can be directly dissipated to the at least one housing partition wall. This improves the overall heat dissipation. Advantageously, sections of the at least one housing partition can at least partially surround the at least one light source. In this way, the at least one housing partition can make contact with the light source mounting plate next to the at least one light source in a heat-transferring manner in sections. This further improves heat dissipation from the at least one light source mounting plate and the at least one light source. Advantageously, at least one of the housing partitions can be designed as a heat sink. In this way, the heat can be dissipated even more efficiently from the at least one light source mounting plate. By arranging the at least one light source and the at least one housing partition on the same extended side of the at least one light source mounting plate, the second extended side of the at least one light source mounting plate remains free. Other components, particularly electronic components, can be arranged there. This eliminates the need for an additional circuit board for further components, such as electronic components. The imaging unit can thus be designed more compactly overall. Furthermore, reducing the number of components required reduces manufacturing effort, particularly component costs, assembly effort, and / or overall costs. This also reduces the weight of the imaging unit. According to the invention, the at least one housing partition wall has at least one light passage, which is assigned to the at least one light source. Light generated by the at least one light source can pass through the at least one housing partition wall through this at least one light passage. The at least one housing partition wall can be arranged between the at least one light source support plate with the at least one light source arranged thereon and the at least one display, wherein the light generated by the at least one light source can pass through the at least one light passage to the at least one display. Advantageously, the imaging unit can be designed for use in a head-up display. A head-up display is known to be a display system in which information is projected into the field of vision of a viewer, in particular a driver of a vehicle. In this way, the viewer can maintain their gaze direction and head position. With the imaging unit according to the invention, the head-up display can be designed to be very compact overall. The imaging unit can generate optical information which can be projected onto a suitable projection surface. Advantageously, the projection surface can be a window, particularly a windshield, of a vehicle. In this way, the optical information generated by the imaging unit can be projected directly into the driver's field of vision. Alternatively, the projection surface can be a different type of combiner, which may be connected to the imaging unit. Advantageously, the imaging unit can be designed for use in a black-panel head-up display. A black-panel head-up display is a head-up display that has a blackened projection surface. Such black-panel head-up displays are particularly common in land vehicles such as higher-end cars, trucks, or buses. Advantageously, the blackened projection surface can be located on the windshield, particularly in a lower area of ​​the windshield, of a vehicle. In this way, the optical information generated by the imaging unit can be clearly displayed within the driver's field of vision. Advantageously, the compact imaging unit according to the invention can be arranged in a space-saving manner in a dashboard below the windshield. This allows the imaging unit to be positioned even in a limited installation space below the windshield, where parts of the air conditioning system may also be located. The efficient heat dissipation enables very high light intensities without causing thermal problems during the operation of the head-up display. The imaging unit, in particular the head-up display, can be used in vehicles. A key functional characteristic of a vehicle is its ability to move. Vehicles can be motor vehicles. Advantageously, the imaging unit, in particular the head-up display, can be used in land vehicles, especially passenger cars, trucks, buses, or the like; mobile machinery, in particular construction or transport machinery such as cranes, excavators, or the like; aircraft; and / or (under)water vehicles. The imaging unit, in particular the head-up display, can also be used in vehicles that can be operated autonomously or semi-autonomously. In an advantageous embodiment, the at least one light passage can be a continuous opening in the at least one housing partition wall and / or the at least one light source can project at least partially into the at least one light passage. Advantageously, the at least one light passage can be a continuous opening in the at least one housing partition. In this way, light generated by the at least one light source can shine through the at least one housing partition. Advantageously, alternatively or additionally, the at least one light source can project at least partially into the at least one light passage. In this way, parts of the at least one light source that protrude from the at least one light source mounting plate can be immersed in the at least one light passage. Thus, areas of the at least one housing partition wall in the vicinity of the at least one light source can rest unimpeded against the at least one light source mounting plate. In a further advantageous embodiment, a wall section of the at least one housing partition surrounding the at least one light passage, in particular the at least one light passage designed as a continuous opening, can have optically reflective properties, in particular be coated with an optically reflective material. In this way, light generated by the at least one light source can be reflected by the wall section surrounding the at least one light passage. This reduces intensity losses in the reflected light within the at least one light passage. Furthermore, the beam characteristics of the light can be improved. In a further advantageous embodiment, the at least one light-transmitting element can widen when viewed from the at least one light source; in particular, the at least one light-transmitting element can have the shape of the surface of an elliptical paraboloid, especially an elliptical paraboloid of revolution. In this way, the propagation of the reflected light can be further improved. Thus, the backlighting for the at least one display can be further enhanced. Advantageously, at least one light aperture has the shape of the surface of an elliptical paraboloid. In this way, light rays emanating from the at least one light source can be reflected at the wall sections of the at least one light aperture in such a way that they exit the at least one light aperture essentially parallel. Thus, the at least one display can be illuminated with parallel light rays. In a further advantageous embodiment, at least one optical element, in particular an optical diffuser, can be assigned to the at least one light passage, in particular at least a part of at least one optical element, in particular an optical diffuser, can be arranged in the at least one light passage and / or on the side of the at least one light passage facing away from the at least one light source, and / or at least one optical plate unit with at least one optical element, in particular at least one diffuser, which is assigned to the at least one light passage, in particular which projects at least partially into the at least one light passage, can be arranged on the side of the at least one housing partition facing away from the at least one light source support plate. Advantageously, at least one optical element can be assigned to the at least one light transmission. In this way, light generated by the light source and radiated through the at least one light transmission can be optically influenced, in particular shaped and / or directed. Advantageously, at least one optical element can be an optical diffuser. This allows the light shining through the at least one light aperture to be scattered. In this way, the light for backlighting the at least one display can be better distributed. Advantageously, at least a portion of at least one optical element, in particular an optical diffuser, can be arranged in the at least one light outlet. In this way, the at least one optical element can be arranged, at least partially, within the at least one housing partition, thus saving space. This allows the entire arrangement, including the at least one light source mounting plate and the at least one housing partition, to be designed more compactly. Advantageously, alternatively or additionally, at least one optical plate unit with at least one optical element, which is assigned to the at least one light source mounting plate, can be arranged on the side of the at least one housing partition facing away from the at least one light source mounting plate. In this way, the at least one optical element can be arranged more easily on the at least one housing partition. An optical plate unit can hold and mount multiple optical elements together. This allows for the integration of multiple light sources within at least one housing partition wall. The backlighting system can thus be equipped with a light source carrier plate that accommodates multiple light sources. This enables higher light intensities and more uniform backlighting. Advantageously, the at least one optical element, in particular the at least one diffuser, and / or the at least one optical plate unit can be made of a thermostable material. In this way, the optical properties of the at least one optical element and / or the at least one optical plate unit cannot be impaired by heat generated during operation of the imaging unit. In a further advantageous embodiment, the at least one housing partition can be arranged between the at least one light source support plate and the at least one display. In this way, the side of the at least one light source support plate on which the at least one light source is arranged can abut the at least one housing partition. On the side of the at least one light source support plate facing away from the at least one housing partition, further components, in particular electronic components such as control components, can be arranged. The imaging unit can thus be implemented in an even more compact form. Advantageously, at least one light source mounting plate can be attached to at least one partition wall of the housing. This allows at least one light source mounting plate to be held in place. In a further advantageous embodiment, the imaging unit can comprise at least one electronic component, in particular at least one electronic control component. In this way, further functions, especially control functions, can be performed by means of the imaging unit. For example, the function of the at least one display can be controlled by an electronic control component. Furthermore, the function of the at least one backlight device can be controlled. In a further advantageous embodiment, at least one component, in particular at least one electronic component and / or at least one electrical component, can be arranged on an extended side of the at least one light source carrier plate, which faces away from the extended side containing the at least one light source. In this way, no additional carrier plate, such as a printed circuit board, is required for the components. This allows the imaging unit to be built even more compactly. Furthermore, assembly effort can be reduced, as fewer components need to be assembled. This also leads to cost savings, since components such as an additional printed circuit board can be dispensed with. The extended side of the at least one light source support plate, on which the at least one light source is arranged, can be called the front side. The extended side of the at least one light source support plate facing away from the front side can be called the back side. The extended sides of a plate, in particular a light source support plate, are the sides that are extended with respect to the thickness of the plate, whereas the other sides define the thickness of the plate. Advantageously, electronic components, such as control components, processors, or the like, can be arranged on the back of the at least one light source carrier plate. For example, components for controlling functions of the imaging unit, in particular for controlling the at least one display and / or the at least one backlighting device, can be arranged on the back of the at least one light source carrier plate. Advantageously, electrical components, such as connectors or the like, can be arranged on the back of the at least one light source mounting plate. In this way, the at least one light source mounting plate can be connected to the at least one display via a connecting cable unit. Alternatively or additionally, the at least one light source mounting plate can be connected to a vehicle control unit via appropriate connecting cables. In a further advantageous embodiment, the at least one housing partition can be part of a base housing section of the housing of the imaging unit, wherein the base housing section can have at least one frame wall with which the base housing section can be connected to other housing sections, in particular a display housing section and / or an end housing section, of the housing. In this way, the at least one housing partition can be held stably in the housing. Furthermore, the housing partition can have a load-bearing function within the housing. For example, the at least one light source support plate can be held stably in the housing. Furthermore, by combining the at least one housing partition with the base housing part, a thermally conductive connection can be created between the at least one housing partition and the outside of the housing. This allows heat generated in the area of ​​the at least one light source to be dissipated more effectively to the environment via the at least one housing partition. Advantageously, the base housing component and at least one internal partition can be manufactured as a single piece. This further simplifies the production of the base housing component and its internal partition. Furthermore, it simplifies the assembly of the imaging unit components. Additionally, the mechanical stability is improved by a one-piece construction. Advantageously, the at least one housing partition, in particular the base housing part with the at least one housing partition, can be manufactured by a molding process, in particular a die-casting process or the like. In this way, the at least one housing partition, in particular the base housing part with the at least one housing partition, can be manufactured more easily as a single piece. In a further advantageous embodiment, the housing of the imaging unit can be composed of at least two housing parts, in particular a base housing part and / or a display housing part and / or an end housing part. In this way, the individual components of the imaging unit, in particular the at least one display, the at least one backlight, and the corresponding housing parts, can be manufactured separately, pre-assembled separately, and assembled with less effort. Advantageously, at least one of the housing parts can be a base housing part. The base housing part can be connected to the at least one housing partition. In this way, the at least one light source mounting plate and the at least one housing partition can be pre-assembled as a base for the imaging unit. Advantageously, alternatively or additionally, at least one of the two housing parts can be a display housing part. The display housing part can be designed to hold the at least one display. The at least one display can be pre-mounted on the display housing part. In a subsequent assembly step, the display housing part with the at least one display can be connected to another of the housing parts, in particular the base housing part with the at least one intermediate housing wall and the at least one light source mounting plate. Advantageously, at least one of the two housing parts can be an end housing part, either alternatively or additionally. The end housing part can cover openings in the housing. In particular, the end housing part can be a bottom part or a top part. Advantageously, a base housing part with at least one intermediate housing wall and at least one light source support plate can be arranged between a display housing part, which carries at least one display, and an end housing part, which closes the housing on the side opposite the display housing part. In this way, a compact housing, closed off from the environment, can be realized. In a further advantageous embodiment, the at least one display can be arranged on a display housing part of the housing of the imaging unit. In this way, the at least one display can be held stably. Furthermore, the at least one display can be pre-assembled with the at least one display housing part and later connected to other components, in particular other housing parts, of the imaging unit. Advantageously, at least one display can be attached to the display housing part. In this way, at least one display can be fixed to the housing. In a further advantageous embodiment, the at least one display can be a liquid crystal display and / or the at least one light source can be a light-emitting diode and / or the at least one light source carrier board can be a printed circuit board and / or the at least one housing partition, in particular the base housing part with the at least one housing partition, can be thermally conductive, in particular made of thermally conductive material or comprising thermally conductive material. Advantageously, at least one display can be a liquid crystal display. This allows at least one display to be operated in an energy-efficient manner. Furthermore, liquid crystal displays allow for high resolutions. Advantageously, at least one light source can be an LED, either as an alternative or in addition. LEDs are space-saving and robust. Furthermore, LEDs can be operated energy-efficiently and produce correspondingly high light outputs. Advantageously, at least one of the light source mounting boards can be a printed circuit board (PCB), either as an alternative or in addition. On a PCB, the relevant components, such as light sources and other electronic or electrical components, can be securely held and electrically connected. Advantageously, alternatively or additionally, at least one housing partition, in particular the base housing part with the at least one housing partition, can have good thermal conductivity. In this way, heat dissipation can be further improved. Advantageously, the at least one housing partition, in particular the base housing part with the at least one housing partition, can be made of or consist of a thermally conductive material, in particular metal, thermally conductive plastic, or the like. This makes the at least one housing partition, in particular the base housing part with the at least one housing partition, easier to manufacture. In a further advantageous embodiment, the at least one light source carrier plate can be a printed circuit board on one extended side of which a plurality of light sources, in particular LEDs, are arranged, and on the other extended side of which at least one electronic component is arranged. The side of the light source carrier plate with the light sources is in contact with the housing partition wall in a heat-transferring manner, such that each light source has its own corresponding light transmission area. In this way, the overall light intensity can be increased. Furthermore, the at least one display can be illuminated more evenly from behind. Furthermore, the problem is solved according to the invention in the head-up display by the fact that the head-up display has at least one imaging unit according to the invention. With at least one imaging unit according to the invention, the head-up display can be designed to be very compact overall. Furthermore, the effort required to implement the head-up display, in particular the number of components and / or the assembly effort, can be reduced. In addition, an extremely bright head-up display can be implemented while simultaneously achieving better dissipation of heat generated during operation. Advantageously, the head-up display can have at least one optical module. With at least one optical module, the optical information generated by the at least one display of the at least one imaging unit can be projected more effectively onto a suitable projection surface. The head-up display has at least one projection surface. Optical information, generated by the at least one display of the imaging unit, can be projected onto this at least one projection surface. Advantageously, the head-up display can be a black-panel head-up display. This allows the optical information generated by at least one imaging unit to be projected even more clearly onto a blackened projection surface. Advantageously, the head-up display can be designed specifically for a vehicle. This allows a viewer inside the vehicle, especially the driver, to be informed by means of visual information projected into their field of vision. In this way, information that is of interest to a viewer, especially the driver of the vehicle, can be projected onto a suitable projection surface, in particular a windshield. Furthermore, the object of the invention is achieved in the vehicle by the fact that the at least one head-up display has at least one imaging unit according to the invention. With at least one head-up display, visual information can be projected into the driver's field of vision. This can further improve the vehicle's driving safety. Furthermore, the features and advantages described in connection with the imaging unit, the head-up display, and the vehicle according to the invention, and their respective advantageous embodiments, apply mutatis mutandis to each other and vice versa. The individual features and advantages can, of course, be combined with one another, potentially resulting in further advantageous effects that go beyond the sum of the individual effects. Brief description of the drawings Further advantages, features, and details of the invention will become apparent from the following description, in which exemplary embodiments of the invention are explained in more detail with reference to the drawings. The person skilled in the art will expediently consider the features disclosed in the drawing, the description, and the claims individually and combine them into meaningful further combinations. Figure 1 schematically shows a vehicle with a head-up display, which includes an imaging unit; Figure 2 shows an exploded view of an imaging unit according to a first exemplary embodiment, which can be used in the head-up display from Figure 1; Figure 3 shows a rear view of the imaging unit from Figure 2; Figure 4 shows a section of the imaging unit from Figures 2 and 3 along section line IV-IV from Figure 3; Figure 5 shows a perspective view of a base housing part of the imaging unit from Figures 2, 3 to 4; Figure 5 shows a perspective view of the base housing part of the imaging unit from Figures 2, 3 to 4.6 a perspective of a light source carrier plate of the imaging unit from Fig. 2, Fig. 3 to Fig. 4; Fig. 7 an exploded view of an imaging unit according to a second embodiment, which can be used in the head-up display from Fig. 1; Fig. 8 a section of the imaging unit from Fig. 7 . In the figures, identical components are labelled with the same reference symbols. embodiment(s) of the invention Fig. 1 shows a vehicle 10 with a head-up display 12 and a control unit 14. The control unit 14 can control functions of the vehicle 10. Furthermore, the control unit 14 can collect and process information, such as information obtained from the vehicle 10's sensors about the environment, information about the vehicle 10 itself (e.g., engine data, battery data, etc.), or other information. The head-up display 12 allows information, for example information transmitted by the control unit 14, to be displayed optically, for example in the form of pictures, symbols, such as numbers, characters or the like, on a windshield 16 in the field of vision of a driver of the vehicle 10. The head-up display 12 comprises an imaging unit 18, an optical module 20 and a projection surface 22. The projection surface 22 is located in the lower area of ​​the windshield 16. The projection surface 22 is a blackened area on the windshield 16. Because of the black projection surface 22, the head-up display 12 can also be called a black-panel head-up display. The imaging unit 18 and the optical module 20 are arranged, by way of example, in a dashboard below the windshield 16. The imaging unit 18 generates the optical information to be displayed. This optical information can be projected onto the projection surface 22 by the optical module 20. The optical module 20 comprises optical components in the form of mirrors and lenses for this purpose. In Figs. 2, 3, 4, 5 to 6, an imaging unit 18 according to a first embodiment is shown in different representations. As shown, for example, in an exploded view in Fig. 2, the imaging unit 18 comprises a display 24, a backlighting device 26 and several electronic components 28. For the sake of clarity, only some of the components 28 are labelled in the figures. Furthermore, the imaging unit 18 comprises a housing 30. The housing 30 is composed of a display housing part 32, shown at the top in Fig. 2, a base housing part 34, shown in the middle, and a top housing part 36, shown at the bottom in Fig. 2. Fig. 3 shows a rear view of the assembled housing 30. Fig. 4 shows a section of the assembled housing 30 along section line IV-IV from Fig. 3. The display housing part 32 is a frame wall with a rectangular shape. On one side, shown in the foreground of Fig. 2, the display housing part 32 has, by way of example, six continuous snap-in recesses 38. On the same side, approximately in the middle, there is a protrusion on the inside of the display housing part 32, forming a passage 40 for a connecting cable unit 42. The connecting cable unit 42 connects the display 24 to a light source carrier plate 44 of the backlighting device 26, as shown, for example, in the sectional view in Fig. 4. The display 24 is a liquid crystal display. The display 24 has the shape of a flat plate. The display 24 is attached to one of the open sides of the display housing part 32. The other open side of the display housing part 32 is inserted into a socket 46 of the base housing part 34. Viewed from its narrow sides, the display housing part 32 has approximately the shape of a parallelogram, as shown, for example, in Fig. 4. Therefore, viewed from its narrow side, the display 24 is inclined to the light source support plate 44. The base housing part 34 comprises a frame wall 48 and a housing partition 50. The housing partition 50, as part of the base housing part 34, is also part of the housing 30. The housing partition 50 is shown, for example, in Figures 4 and 5. Figure 5 shows a perspective view of the base housing part 34. The base housing part 34, with the housing partition 50 and the frame wall 48, is manufactured as a single piece. The base housing part 34 is made of a thermally conductive material, for example, a metal such as aluminum. The base housing part 34 is manufactured using a molding process, for example, a die-casting process. The frame wall 48 of the base housing part 34 has a rectangular shape. A portion of the frame wall 48 facing the display housing part 32 forms the insertion section 46. The outer dimensions of the frame wall 48 in the area of ​​the insertion section 46 are slightly smaller than the inner dimensions of the display housing part 32. On one outer side, the frame wall 48 has six locking lugs 52. When the housing 30 is assembled, the locking lugs 52 engage in the respective locking recesses 38 of the display housing part 32. On the side of the frame wall 48 with the locking lugs 52, a feed-through channel 54 is provided below the insertion section 46. When the housing 30 is assembled, the feed-through channel 54 connects to the feed-through 40 of the display housing part 32. When the imaging unit 18 is assembled, the connecting cable unit 42 is fed through the feed-through channel 54. The housing partition 50 extends within the frame wall 48. The housing partition 50 is located on the side of the base housing part 34 facing away from the insertion section 46. Furthermore, the housing partition 50 is located on the side of the base housing part 34 facing away from the display 24. The housing partition 50 forms the bottom of the base housing part 34. The housing partition 50 is flat on both its side facing the display 24 and its side facing away from the display 24. The housing partition 50 has a plurality of light passages 56 for light sources 58. The light sources 58 are mounted on the light source support plate 44 and electrically contacted, as shown, for example, in perspective in Fig. 2. The light openings 56 are identical in shape and size. Each light opening 56 is a through opening in the housing partition 50. The light openings 56 are evenly distributed on the housing partition 50. The light openings 56 are arranged in rows and columns along the housing partition 50. The light apertures 56 each have the shape of the mantle of an elliptical paraboloid of revolution, as shown, for example, in Fig. 4. Each light aperture 56 widens when viewed from the corresponding light source 58. The light passages 56 and the surrounding wall sections 60 each have optically reflective properties. For example, the wall sections 60 are provided with a mirror coating. The backlighting assembly 26 comprises the light source carrier plate 44, the light sources 58 and part of the electronic components 28. The light source carrier plate 44 is a flat printed circuit board. The light sources 58 are each designed as light-emitting diodes (LEDs). The LEDs used are identical, for example, with regard to shape and function. The arrangement of the light sources 58 on the extended side of the light source carrier plate 54 corresponds to the arrangement of the light apertures 56 on the housing partition 50. No components other than the light sources 58 are arranged on this extended side of the light source carrier plate 44. With the imaging unit 18 mounted, the light source carrier plate 44, with the side on which the light sources 58 are arranged, rests against the side of the housing partition 50 facing away from the display 24. The side of the light source carrier plate 44 with the light sources 58 is in thermally conductive contact with that side of the housing partition 50. The light sources 58 project into their respective light openings 56. The housing partition 50 surrounds each of the light sources 58. On the extended side of the light source carrier plate 44, which faces away from the extended side with the light sources 58, the electronic components 28 are mounted and electrically contacted. Additionally, on this side of the light source carrier plate 44, other electrical components, such as connectors for the connecting cable unit 42, which are not of further interest, are arranged. The electronic components 28 serve to control the display 24 and the backlight assembly 26 with the light sources 58. Some of the electronic components 28 are designed, for example, as control components such as processors or the like. The end housing part 36 has a cover section 62 and a frame section 64. The frame section 64 surrounds the cover section 62. The end housing part 36 is manufactured in one piece, for example, using a molding process such as die casting. The frame section 64 has a cover flap 66 on one side. When the housing 30 is assembled, the cover flap 66 covers the feedthrough channel 54 of the base housing part 34 from the environment. The end housing part 36 closes the base housing part 34 on the side facing away from the display housing part 32. The following describes an exemplary procedure for assembling the imaging unit 18. The order of the individual steps of the procedure can also be changed. Several steps can also be combined. The connecting cable unit 42 is connected to the display 24. The display 24 is attached to one side of the display housing part 32. The connecting cable unit 42 is guided along the inside of the display housing part 32 via the feedthrough 40. The display housing part 32, with the display 24 and the intermediate housing wall 50 leading, is then inserted onto the insertion section 46 of the base housing part 34 such that the side of the display housing part 32 with the locking receptacles 38 is on the side of the base housing part 34 with the locking lugs 52. The connecting cable unit 42 is guided along the outside of the base housing part 34 along the feed-through channel 54. In the correct assembly position, the locking lugs 52 engage in the respective locking receptacles 38. The light source mounting plate 44 is pre-assembled with the light sources 58 and the electronic components 28. The pre-assembled light source mounting plate 44 is placed, with the side containing the light sources 58 facing forward, onto the outside of the housing partition 50 of the base housing part 34. The light source mounting plate 44 is aligned with the housing partition 50 so that each of the light sources 58 is aligned with one of the light apertures 56. The light source mounting plate 44 is then fixed to the housing partition 50 using fasteners. Then the free end of the connecting cable unit 42 is connected to the plug connection of the light source carrier plate 44, which is not shown in the figures and is located on the side with the electronic components 28. Finally, the end housing part 36 is attached to the free side of the base housing part 34. The cover flap 66 covers the feedthrough channel 54 of the base housing part 34 on the outside of the housing 30. The housing partition 50 divides the housing 30 into a component chamber 67 and an illumination chamber 68. The component chamber 67 extends between the housing partition 50 and the cover section 62 of the end housing part 36. The components 28 and the light source carrier plate 44 are arranged in the component chamber 67. The illumination chamber 68 extends between the housing partition 50 and the display 24. The rear of the display 24 borders the illumination chamber 68. Light generated by the light sources 58 of the backlighting device 26 can propagate through the illumination chamber 68 to illuminate the display 24. The fully assembled imaging unit 18 can be combined with the optical module 20 and arranged in the dashboard below the windshield 16. When the head-up display 18 is in operation, the display 24 and the light sources 58 of the backlighting unit 26 are controlled as needed. The corresponding information is displayed optically on the display 24. The light sources 58 generate the light for the backlighting, which enters the illumination chamber 68 through the respective light apertures 56. In the light apertures 46, the light is reflected by the reflective wall sections 60 and directed towards the back of the display 24. Heat generated during operation of the backlighting device 26 with the light sources 58 is transferred directly to the heat-conducting housing partition 50. The housing partition 50, in turn, dissipates the heat to the environment via the frame wall 48. Figures 7 and 8 show a second embodiment of an imaging unit 18. Figure 7 shows an exploded view and Figure 8 a section of the imaging unit 18. Those elements that are similar to those of the first embodiment shown in Figures 2, 3, 4, 5 to 6 are designated with the same reference numerals. The second embodiment differs from the first embodiment in that the imaging unit 18 additionally comprises an optical plate unit 70. The optical plate unit 70 is arranged between the housing partition 50 and the display 24. The optical plate unit 70 is located in the illumination chamber 68. The optical plate unit 70 is made of a thermostable, optically transparent material, for example plastic. The optical plate unit 70 comprises a rectangular plate section 72 and a plurality of optical diffuser sections 74. The optical plate unit 70, with the plate section 72 and the diffuser sections 74, is manufactured as a single piece. The optical plate unit 70 is produced, for example, by a molding process, such as a die-casting process. The diffuser sections 74 are identical in shape and size. The outer shape of the diffuser sections 74 corresponds to the inner shape of the light passages 56. The diffuser sections 74 each have the shape of an elliptical paraboloid of revolution. The free side of each diffuser section 72 facing away from the plate section 72 is flattened and has a recess 76 in the center for a respective light source 58. All diffuser sections 74 are located on the same side of the plate section 72. The number and distribution of the diffuser sections 74 along the plate section 72 corresponds to the number and distribution of the light passages 56 along the housing partition 50 and the number and distribution of the light sources 58 along the light source support plate 44. Each diffusion section 74 dips into an associated light passage 56 of the housing partition wall 50. With the imaging unit 18 mounted, the optical plate unit 70 is arranged on the housing partition 50, as shown in Fig. 8, such that each diffuser section 74 is immersed in one of the light passages 56. The light sources 58 each project into the recess 76 of the corresponding diffuser section 74. With the imaging unit 18 mounted, the outer surfaces of the diffuser sections 74 abut the inner surfaces of the wall sections 60 of the respective light openings 56. In the plate intermediate areas 78, the plate section 72 is arranged at a distance from the base intermediate areas 80 of the housing partition 50. The plate intermediate areas 78 are the areas of the plate section 22 between the diffuser sections 78. The base intermediate areas 80 are the areas of the housing partition 50 between the light openings 56. An air-conducting volume 82 is provided between the plate section 72 and the housing partition 50, or between the plate intermediates 78 and the base intermediates 80. Air can flow along the surface of the housing partition 50 and the plate section 72 within this air-conducting volume 82. This allows heat to be dissipated from the housing partition 50. During operation of the imaging unit 18, the light generated by the light sources 58 is dispersed by means of the diffuser sections 74. This results in an even more uniform backlighting of the display 24. When assembling the imaging unit 18, the optical plate unit 70 can be inserted into the base housing part 34 before the display housing part 32 with the display 24 is placed on the base housing part 34.

Claims

Imaging unit (18), in particular an imaging unit (18) for a head-up display (12), in particular for a black-panel head-up display (12), in particular for a vehicle (10), with at least one display (24) and with at least one backlighting device (26) for the at least one display (24), characterized in that the imaging unit (18) has a housing (30) in which at least a part of the at least one backlighting device (26) is arranged, the at least one backlighting device (26) has at least one light source carrier plate (44) and at least one light source (58) which is arranged on one of the extended sides of the at least one light source carrier plate (44), the housing (30) has at least one intermediate wall (50) on which the at least one light source carrier plate (44) thermally contacts, wherein the at least one light source carrier plate (44) has the extended sideon which at least one light source (58) is arranged, on which at least one housing partition (50) is located, wherein the at least one housing partition (50) has at least one light transmission (56) which is assigned to the at least one light source (58). Imaging unit according to claim 1, characterized in that the at least one light passage (56) is a continuous opening in the at least one housing partition (50) and / or the at least one light source (58) projects at least sectionally into the at least one light passage (56). Imaging unit according to claim 1 or 2, characterized in that a wall section (60) surrounding the at least one light passage (56), in particular the at least one light passage (56) designed as a continuous opening, of the at least one housing partition wall (50) has optically reflective properties, in particular is coated with an optically reflective material. Imaging unit according to one of the preceding claims, characterized in that the at least one light passage (56) widens when viewed from the at least one light source (58), in particular the at least one light passage (56) has the shape of the mantle of an elliptical paraboloid, in particular an elliptical paraboloid of revolution. Imaging unit according to one of the preceding claims, characterized in that at least one optical element (74), in particular an optical diffuser, is associated with the at least one light passage (56), in particular in which at least one optical element (74), in particular an optical diffuser, is arranged in the at least one light passage (56) and / or on the side of the at least one light passage (56) facing away from the at least one light source (58), and / or on the side of the at least one housing partition (50) facing away from the at least one light source support plate (44), at least one optical plate unit (70) with at least one optical element (74), in particular at least one diffuser, which is associated with the at least one light passage (56), in particular which projects at least partially into the at least one light passage (56), is arranged. Imaging unit according to one of the preceding claims, characterized in that the at least one housing partition (50) is arranged between the at least one light source support plate (44) and the at least one display (24). Imaging unit according to one of the preceding claims, characterized in that the imaging unit (18) comprises at least one electronic component (28), in particular at least one electronic control component. Imaging unit according to one of the preceding claims, characterized in that at least one component (28), in particular at least one electronic component and / or at least one electrical component, is arranged on an extended side of the at least one light source carrier plate (44), which is facing away from the extended side with the at least one light source (58). Imaging unit according to one of the preceding claims, characterized in that the at least one housing partition (50) is part of a base housing part (34) of the housing (30) of the imaging unit (18), wherein the base housing part (34) has at least one frame wall (48) with which the base housing part (34) is connected to other housing parts (32, 36), in particular a display housing part (32) and / or an end housing part (36), of the housing (30). Imaging unit according to one of the preceding claims, characterized in that the housing (30) of the imaging unit (18) is composed of at least two housing parts (32, 34, 36), in particular a base housing part (34) and / or a display housing part (32) and / or an end housing part (36). Imaging unit according to one of the preceding claims, characterized in that the at least one display (24) is arranged on a display housing part (32) of the housing (30) of the imaging unit (18). Imaging unit according to one of the preceding claims, characterized in that the at least one display (24) is a liquid crystal display and / or the at least one light source (58) is a light-emitting diode and / or the at least one light source carrier plate (44) is a printed circuit board and / or the at least one housing partition (50), in particular the base housing part (34) with the at least one housing partition (50), is thermally conductive, in particular is made of thermally conductive material or comprises thermally conductive material. Imaging unit according to one of the preceding claims, characterized in that the at least one light source carrier plate (44) is a printed circuit board, on one extended side of which a plurality of light sources (58), in particular light-emitting diodes, are arranged and on the other extended side of which at least one electronic component (28) is arranged, and the light source carrier plate (44) with the side with the light sources (58) is in contact with the housing partition wall (50) in a heat-transferring manner such that each light source (58) is assigned a respective light transmission (56). Head-up display (12), in particular head-up display (12) for a vehicle (10), in particular black panel head-up display (12), with at least one imaging unit (18) which has at least one display (24), at least one backlighting device (26) for the at least one display (24) and at least one projection surface (22), characterized in that the head-up display (12) has at least one imaging unit (18) according to one of claims 1 to 13. Vehicle (10) with at least one head-up display (12), in particular at least one black panel head-up display (12), with at least one imaging unit (18) which has at least one display (24), at least one backlighting device (26) for the at least one display (24) and at least one projection surface (22), characterized in that the at least one head-up display (12) has at least one imaging unit (18) according to one of claims 1 to 13.

Images