Backlight module, head-up display device and vehicle

Abstract

The utility model discloses a backlight module, a head-up display device and a vehicle. The backlight module comprises a shell, a light source and a light source, the light emitting part is arranged in the shell; the display screen is arranged in the shell; the reflecting mirror assembly is arranged in the shell and used for reflecting light rays emitted by the light-emitting part to the display screen, the reflecting mirror assembly comprises a plurality of reflecting mirrors, and at least one of the reflecting mirrors is a cold light mirror. According to the backlight module, the light emitted by the light-emitting part is reflected by the multiple reflectors in the reflector assembly for multiple times and reaches the display screen, so that the light is reflected for multiple times, the optical path is increased, the uniformity of light spots formed on the display screen is improved under the condition that the number of the light-emitting parts is not increased, and therefore the cost is reduced; and meanwhile, the heat of the light reflected to the display screen is reduced, so that the phenomenon of burn-in of the display screen is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a backlight module, a head-up display device and a vehicle. Background Art

[0002] The existing backlight modules of HUD mostly adopt the direct-lit or one-time emission direct-lit backlight solutions, which are generally used in combination with display screens. In the future, HUD will iterate towards a large field of view, requiring larger-sized display screens. Larger-sized display screens need to add more LED lights to improve the uniformity of light on the display screen, resulting in increased costs. At the same time, more LEDs will cause the heat of the light conducted to the display screen to rise, and when sunlight pours in, the problem of screen burn-in is likely to occur. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a backlight module, which improves the uniformity of the light spot formed on the display screen without increasing the light-emitting components, thereby reducing costs, and reducing the heat of the light reflected onto the display screen, thereby reducing the occurrence of screen burn-in on the display screen.

[0004] The utility model also provides a head-up display device, including the above-mentioned backlight module.

[0005] The utility model also provides a vehicle, including the above-mentioned head-up display device.

[0006] The backlight module according to an embodiment of the utility model includes: a housing; a light-emitting component, which is arranged in the housing; a display screen, which is arranged in the housing; a mirror assembly, which is arranged in the housing and is used for reflecting the light emitted by the light-emitting component onto the display screen, and the mirror assembly includes a plurality of mirrors, and at least one of the plurality of mirrors is a cold mirror.

[0007] According to the backlight module of the embodiment of the utility model, by arranging the light-emitting component, the display screen and the mirror assembly in the housing, the mirror assembly is used for reflecting the light emitted by the light-emitting component onto the display screen, the mirror assembly includes a plurality of mirrors, and the light emitted by the light-emitting component reaches the display screen after multiple reflections by the plurality of mirrors in the mirror assembly, so that the light undergoes multiple reflections, increasing the optical path, and improving the uniformity of the light spot formed on the display screen without increasing the light-emitting components, thereby reducing costs. And at least one of the plurality of mirrors is a cold mirror, reducing the heat of the light reflected onto the display screen, thereby reducing the occurrence of screen burn-in on the display screen.

[0008] In some embodiments of the utility model, the plurality of mirrors are sequentially arranged on the light propagation path from the light-emitting component to the display screen.

[0009] In some embodiments of the present utility model, the reflecting mirror is a plane mirror.

[0010] In some embodiments of the present utility model, a plurality of the reflecting mirrors include a first reflecting mirror and a second reflecting mirror, at least one of the first reflecting mirror and the second reflecting mirror is a cold light mirror, the display screen and the light emitting member are arranged offset in a first direction, the first direction is perpendicular to the light emitting direction of the light emitting member, the first reflecting mirror and the second reflecting mirror are respectively located on both sides of the light emitting member along the first direction, and are located on both sides of the display screen along the first direction.

[0011] In some embodiments of the present utility model, the housing includes a lower housing, an upper housing and an upper cover, the upper housing is arranged above the lower housing and connected to the lower housing, the upper side of the upper housing is open, the upper cover is covered at the upper open end of the upper housing, the lower end of the lower housing is open, and the backlight module further includes: a substrate, the substrate is arranged at the lower open end of the lower housing and seals the lower open end of the lower housing, and the light emitting member is arranged on the substrate.

[0012] In some embodiments of the present utility model, in the thickness direction of the substrate and along the direction from the substrate to the display screen, at least a part of the lower housing extends obliquely towards the display screen, and the first reflecting mirror and the second reflecting mirror are respectively connected to two inner walls of the lower housing opposite to each other along the first direction.

[0013] In some embodiments of the present utility model, the substrate and the lower housing are connected by fasteners; and / or, the upper housing and the lower housing are snap-connected; and / or, the upper housing and the upper cover are snap-connected.

[0014] In some embodiments of the present utility model, the backlight module further includes: a total reflection lens module, the total reflection lens module is arranged in the housing and between the reflecting mirror assembly and the light emitting member; a plano lens, the plano lens is arranged in the housing and between the total reflection lens module and the reflecting mirror assembly; a field lens, the field lens is arranged in the housing and between the reflecting mirror assembly and the display screen; a diffusion sheet, the diffusion sheet is arranged in the housing and between the display screen and the field lens.

[0015] The head-up display device according to the embodiment of the present utility model includes the above-mentioned backlight module.

[0016] The head-up display device according to an embodiment of the present invention, by providing the above-mentioned backlight module, arranges the light-emitting element, the display screen and the mirror assembly in the housing. The mirror assembly is used to reflect the light emitted by the light-emitting element onto the display screen. The mirror assembly includes a plurality of mirrors. The light emitted by the light-emitting element reaches the display screen after multiple reflections by the plurality of mirrors in the mirror assembly, so that the light undergoes multiple reflections, increasing the optical path. Without increasing the light-emitting element, the uniformity of the light spot formed on the display screen is improved, thereby reducing the cost. And at least one of the plurality of mirrors is a cold mirror, so that the heat of the light reflected onto the display screen is reduced, thereby reducing the occurrence of screen burn-in of the display screen.

[0017] The vehicle according to an embodiment of the present invention includes the above-mentioned head-up display device.

[0018] The vehicle according to an embodiment of the present invention, by providing the above-mentioned head-up display device and arranging the above-mentioned backlight module, arranges the light-emitting element, the display screen and the mirror assembly in the housing. The mirror assembly is used to reflect the light emitted by the light-emitting element onto the display screen. The mirror assembly includes a plurality of mirrors. The light emitted by the light-emitting element reaches the display screen after multiple reflections by the plurality of mirrors in the mirror assembly, so that the light undergoes multiple reflections, increasing the optical path. Without increasing the light-emitting element, the uniformity of the light spot formed on the display screen is improved, thereby reducing the cost. And at least one of the plurality of mirrors is a cold mirror, so that the heat of the light reflected onto the display screen is reduced, thereby reducing the occurrence of screen burn-in of the display screen.

[0019] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1 is an exploded view of the backlight module according to an embodiment of the present invention;

[0022] Figure 2 is a cross-sectional view of the backlight module according to an embodiment of the present invention.

[0023] Reference Signs:

[0024] 10. Backlight module;

[0025] 1. Housing; 11. Upper housing; 12. Lower housing; 13. Upper cover;

[0026] 2. Display screen;

[0027] 3. Reflector assembly; 31. First reflector; 32. Second reflector; 33. Reflector;

[0028] 4. Substrate;

[0029] 5. Total reflection lens module;

[0030] 6. Planar lens;

[0031] 7. Field lens;

[0032] 8. Diffusion sheet. Detailed implementation manners

[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0035] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] Next, refer to Figure 1 and Figure 2 to describe the backlight module 10 according to the embodiments of the present utility model.

[0037] As Figure 1 andFigure 2 As shown, the backlight module 10 according to an embodiment of the present invention includes: a housing 1, a light-emitting element, a display screen 2, and a mirror assembly 3.

[0038] Specifically, referring to Figure 1 and Figure 2 , the light-emitting element is disposed in the housing 1; the display screen 2 is disposed in the housing 1; the mirror assembly 3 is disposed in the housing 1 and is used to reflect the light emitted by the light-emitting element onto the display screen 2. The mirror assembly 3 includes a plurality of mirrors 33, and at least one of the plurality of mirrors 33 is a cold mirror.

[0039] Among them, it should be noted that the light-emitting element can be an LED (Light Emitting Diode) lamp, etc., and the display screen 2 can be a TFT (Thin Film Transistor) screen. When the light of the light-emitting element irradiates the TFT screen, the TFT screen can control the arrangement of the liquid crystal molecules below it, thereby controlling the ability of the light to pass through the liquid crystal screen. By changing the voltage on the TFT screen, the arrangement of the liquid crystal molecules can be adjusted, and then the brightness of each pixel can be adjusted to realize the display of the image.

[0040] It can be understood that the light emitted by the light-emitting element reaches the display screen 2 after multiple reflections by the plurality of mirrors 33 in the mirror assembly 3, so that the light undergoes multiple reflections. Compared with the light emitted by the light-emitting element directly irradiating the display screen, the path of the light is increased. Increasing the optical path can make the phase change of the light wave large enough, so that the light waves reinforce each other in some regions of space and weaken each other in other regions, and finally form a more uniform light intensity distribution. Thus, without increasing the light-emitting element, the uniformity of the light spot formed on the display screen 2 is improved, thereby reducing the cost.

[0041] Furthermore, since at least one of the plurality of mirrors 33 is a cold mirror, the cold mirror is composed of a dielectric mirror and a dichroic filter, and can reflect all visible light frequency bands in the spectrum while allowing light with an infrared bandwidth to pass through. Thus, the heat of the light reflected onto the display screen 2 is reduced, thereby reducing the occurrence of screen burn-in of the display screen 2.

[0042] For example, in the present invention, there are two mirrors 33, and one of the mirrors 33 is a cold mirror. However, the present invention is not limited thereto. There can be more mirrors 33, such as 3, 4, 5, or 6, etc., and there can be 2, 3, 4, or 5 cold mirrors, etc. Among them, the number of cold mirrors is less than or equal to the number of mirrors 33.

[0043] According to the backlight module 10 of the embodiment of the present utility model, by arranging a light-emitting component, a display screen 2, and a mirror assembly 3 in a housing 1, the mirror assembly 3 is used to reflect the light emitted by the light-emitting component onto the display screen 2. The mirror assembly 3 includes a plurality of mirrors 33. The light emitted by the light-emitting component reaches the display screen 2 after multiple reflections by the plurality of mirrors 33 in the mirror assembly 3, so that the light undergoes multiple reflections, increasing the optical path. Without increasing the light-emitting component, the uniformity of the light spot formed on the display screen 2 is improved, thereby reducing the cost. And at least one of the plurality of mirrors 33 is a cold mirror, so that the heat of the light reflected onto the display screen 2 is reduced, thereby reducing the occurrence of screen burn of the display screen 2.

[0044] In some embodiments of the present utility model, as Figure 1 and Figure 2 shown, the plurality of mirrors 33 are sequentially arranged on the light propagation path from the light-emitting component to the display screen 2. Thus, it is convenient for the plurality of mirrors 33 to reflect light sequentially, thereby facilitating the increase of the optical path. Without increasing the light-emitting component, the uniformity of the light spot formed on the display screen 2 is improved, thereby reducing the cost.

[0045] In some embodiments of the present utility model, as Figure 1 and Figure 2 shown, the mirror 33 is a plane mirror. It can be understood that the reflecting surface of the plane mirror is flat, so the plane mirror does not change the direction of the incident light, and thus the reflected light still maintains the original direction, which is convenient for the position design among the display screen 2, the light-emitting component, and the mirror assembly 3.

[0046] In some embodiments of the present utility model, as Figure 1 and Figure 2 shown, the plurality of mirrors 33 include a first mirror 31 and a second mirror 32. At least one of the first mirror 31 and the second mirror 32 is a cold mirror. The display screen 2 and the light-emitting component are arranged in a staggered manner in a first direction, the first direction is perpendicular to the light emission direction of the light-emitting component, the first mirror 31 and the second mirror 32 are respectively located on both sides of the light-emitting component along the first direction, and are located on both sides of the display screen 2 along the first direction. Among them, it should be noted that among the first mirror 31 and the second mirror 32, the first mirror 31 is located upstream of the light propagation direction, and the second mirror is located downstream of the light propagation direction.

[0047] It can be understood that the first reflector 31 and the second reflector 32 need to be spaced apart so that light can be reflected. The first reflector 31 and the second reflector 32 are respectively located on both sides of the light-emitting component along the first direction and on both sides of the display screen 2 along the first direction, so that the reflected light from the first reflector 31 to the second reflector 32 propagates along the first direction. The display screen 2 and the light-emitting component are arranged in a dislocation manner in the first direction, so that the reflected light of the second reflector 32 can reach the display screen 2 conveniently.

[0048] For example, in the present utility model, the first reflector 31 is a cold light mirror, but the present utility model is not limited thereto. The first reflector 31 and the second reflector 32 can both be cold light mirrors, or the second reflector 32 can be a cold light mirror.

[0049] In some embodiments of the present utility model, such as Figure 1 and Figure 2 shown, the housing 1 includes a lower housing 121, an upper housing 111 and an upper cover 13. The upper housing 111 is arranged above the lower housing 121 and connected to the lower housing 121. The upper side of the upper housing 111 is open, the upper cover 13 is covered at the upper open end of the upper housing 111, and the lower end of the lower housing 121 is open.

[0050] It can be understood that the lower end of the lower housing 121 is open, the upper end of the upper housing 111 is open, and both the lower housing 121 and the upper housing 111 are of a hollow structure. Thus, it is convenient to install the light-emitting component, the display screen 2 and the mirror assembly 3. Among them, the mirror assembly 3 is arranged in the lower housing 121, and the display screen 2 is arranged in the upper housing 111.

[0051] Furthermore, as Figure 1 and Figure 2 shown, the backlight module 10 further includes: a substrate 4. The substrate 4 is arranged at the lower open end of the lower housing 121 and seals the lower open end of the lower housing 121. The light-emitting component is arranged on the substrate 4. Thus, the substrate 4 can not only serve as a carrier for the light-emitting component but also be used to enclose the housing 1.

[0052] In some embodiments of the present utility model, such as Figure 1 and Figure 2 shown, in the thickness direction of the substrate 4 and along the direction from the substrate 4 to the display screen 2, at least part of the lower housing 121 extends obliquely towards the display screen 2. The first reflector 31 and the second reflector 32 are respectively connected to the two inner walls of the lower housing 121 opposite to each other along the first direction.

[0053] It can be understood that, since the display screen 2 and the light-emitting component are arranged with a dislocation in the first direction, the first direction is perpendicular to the light-emitting direction of the light-emitting component, the first reflector 31 and the second reflector 32 are respectively located on both sides of the light-emitting component along the first direction, and are located on both sides of the display screen 2 along the first direction. Thus, the first reflector 31 and the second reflector 32 extend obliquely towards the display screen 2 in the thickness direction of the substrate 4 and along the direction from the substrate 4 to the display screen 2. And the first reflector 31 and the second reflector 32 are arranged in the lower housing 121, and at least part of the lower housing 121 extends obliquely towards the display screen 2, thereby facilitating the arrangement of the first reflector 31 and the second reflector 32.

[0054] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the substrate 4 and the lower housing 121 are connected by fasteners, thereby improving the connection reliability between the substrate 4 and the lower housing 121.

[0055] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the upper housing 111 and the lower housing 121 are snap-connected; thereby, the connection reliability between the upper housing 111 and the lower housing 121 is improved, and at the same time, the disassembly and installation between the upper housing 111 and the lower housing 121 are facilitated, and the portability of disassembly, assembly and maintenance is improved.

[0056] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the upper housing 111 and the upper cover 13 are snap-connected. Thus, the connection reliability between the upper housing 111 and the upper cover 13 is improved, and at the same time, the disassembly and installation between the upper housing 111 and the upper cover 13 are facilitated, and the portability of disassembly, assembly and maintenance is improved.

[0057] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the backlight module 10 further includes: a total reflection lens module 5, a plano lens 6, a field lens 7 and a diffusion sheet 8. The total reflection lens module 5 is arranged in the housing 1 and between the mirror assembly 3 and the light-emitting component; the total reflection lens module 5 utilizes the physical principle of total reflection to reflect light inside the total reflection lens module 5 to ensure that the light from the light-emitting component can be effectively guided and projected onto the display screen 2. At the same time, the total reflection lens module 5 can reduce the refracted light of the light-emitting component, thereby reducing the energy loss during the light propagation process.

[0058] Furthermore, as Figure 1 and Figure 2As shown, the planar lens 6 is disposed inside the housing 1 and between the total reflection lens module 5 and the mirror assembly 3; the planar lens 6 can help collimate the light emitted from the total reflection lens module 5. In this way, the light can be adjusted to a more suitable propagation direction before entering the mirror assembly 3. The planar lens 6 can adjust the light distribution so that the light can be evenly distributed before being reflected onto the mirror assembly 3. By placing the planar lens 6 between the total reflection lens module 5 and the mirror assembly 3, the ghosting and stray light caused by the complex light path can be reduced, thereby improving the contrast and clarity of the displayed image.

[0059] Furthermore, as Figure 1 and Figure 2 shown, the field lens 7 is disposed inside the housing 1 and between the mirror assembly 3 and the display screen 2; the field lens 7 can focus and collimate the reflected light to ensure that the light irradiates the display screen 2 at the correct angle and path, thereby generating a clear image.

[0060] Furthermore, as Figure 1 and Figure 2 shown, the diffuser 8 is disposed inside the housing 1 and between the display screen 2 and the field lens 7. The setting of the diffuser 8 can scatter the light evenly, so that the light can be more evenly distributed during the propagation process, avoiding the phenomenon of uneven brightness when the light directly irradiates the display screen 2, thereby improving the overall display uniformity.

[0061] The head-up display device according to an embodiment of the present invention will be described below.

[0062] The head-up display device according to an embodiment of the present invention includes the above-mentioned backlight module 10.

[0063] The head-up display device according to an embodiment of the present invention, by providing the above-mentioned backlight module 10, the light-emitting element, the display screen 2 and the mirror assembly 3 are disposed inside the housing 1. The mirror assembly 3 is used to reflect the light emitted by the light-emitting element onto the display screen 2. The mirror assembly 3 includes a plurality of mirrors 33. The light emitted by the light-emitting element reaches the display screen 2 after multiple reflections by the plurality of mirrors 33 in the mirror assembly 3, so that the light undergoes multiple reflections, increasing the optical path. Without increasing the light-emitting element, the uniformity of the light spot formed on the display screen 2 is improved, thereby reducing the cost. And at least one of the plurality of mirrors 33 is a cold mirror, so that the heat of the light reflected onto the display screen 2 is reduced, thereby reducing the occurrence of screen burn-in of the display screen 2.

[0064] The vehicle according to an embodiment of the present invention will be described below.

[0065] The vehicle according to an embodiment of the present invention includes the above-mentioned head-up display device.

[0066] According to the vehicle of the embodiment of the present utility model, by providing the above-mentioned head-up display device and the above-mentioned backlight module 10, the light-emitting element, the display screen 2 and the mirror assembly 3 are arranged in the housing 1. The mirror assembly 3 is used to reflect the light emitted by the light-emitting element onto the display screen 2. The mirror assembly 3 includes a plurality of mirrors 33. The light emitted by the light-emitting element reaches the display screen 2 after multiple reflections by the plurality of mirrors 33 in the mirror assembly 3, so that the light undergoes multiple reflections, increasing the optical path. Without increasing the light-emitting element, the uniformity of the light spot formed on the display screen 2 is improved, thereby reducing the cost. And at least one of the plurality of mirrors 33 is a cold mirror, so that the heat of the light reflected onto the display screen 2 is reduced, thereby reducing the occurrence of the situation of the display screen 2 being burned.

[0067] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A backlight module, characterized in that: include: case; A light emitting component, wherein the light emitting component is disposed in the housing; A display screen, wherein the display screen is disposed in the housing; A reflector assembly is disposed in the housing and is used to reflect the light emitted by the light emitting element onto the display screen. The reflector assembly includes a plurality of reflectors, at least one of which is a cold light mirror.

2. The backlight module according to claim 1, characterized in that: The plurality of reflectors are arranged in sequence on the light propagation path from the light emitting element to the display screen.

3. The backlight module according to claim 1, characterized in that: The reflecting mirror is a plane mirror.

4. The backlight module according to claim 2, characterized in that: The multiple reflectors include a first reflector and a second reflector, at least one of the first reflector and the second reflector is a cold light mirror, the display screen and the light-emitting component are staggered in a first direction, the first direction is perpendicular to the light emission direction of the light-emitting component, the first reflector and the second reflector are respectively located on both sides of the light-emitting component along the first direction, and on both sides of the display screen along the first direction.

5. The backlight module according to claim 4, characterized in that: The housing comprises a lower housing, an upper housing and an upper cover, wherein the upper housing is arranged above the lower housing and connected to the lower housing, the upper side of the upper housing is open, the upper cover is arranged at the upper end opening of the upper housing, and the lower end of the lower housing is open, and the backlight module further comprises: A substrate is arranged at the lower opening of the lower shell and blocks the lower opening of the lower shell, and the light emitting component is arranged on the substrate.

6. The backlight module according to claim 5, characterized in that: In the thickness direction of the substrate and along the direction from the substrate to the display screen, at least a portion of the lower shell extends obliquely toward the display screen, and the first reflector and the second reflector are respectively connected to two inner walls of the lower shell opposite to each other along the first direction.

7. The backlight module according to claim 5, characterized in that: The base plate and the lower shell are connected by fasteners; And / or, the upper shell and the lower shell are snap-connected; And / or, the upper shell and the upper cover are snap-connected.

8. The backlight module according to claim 1, characterized in that: Also includes: A total reflection lens module, the total reflection lens module is arranged in the housing and between the reflector assembly and the light emitting element; A plane lens, the plane lens is arranged in the housing and between the total reflection lens module and the reflector assembly; A field lens, the field lens is arranged in the housing and between the reflector assembly and the display screen; A diffusion sheet is arranged in the housing and between the display screen and the field lens.

9. A head-up display device, characterized in that: It comprises a backlight module according to any one of claims 1-8.

10. A vehicle, characterized in that: The device comprises a head-up display device according to claim 9.

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