Liquid crystal display module and head-up display device

Abstract

The application relates to a liquid crystal display module and a head-up display device. The liquid crystal display module comprises a backlight source, a light collecting cup, a first reflecting element, a second reflecting element and a liquid crystal panel. The light collecting cup has a light reflecting surface on the light emitting side of the backlight source, and the light reflecting surface is arranged around the light emitting area of the backlight source. The first reflecting element is arranged on the light emitting side of the light collecting cup and is inclined to the main light emitted by the backlight source. The second reflecting element is arranged to be inclined to the first reflecting element and is used for receiving at least part of the light reflected by the first reflecting element. The liquid crystal panel is arranged to be inclined to the second reflecting element and is used for receiving at least part of the light reflected by the second reflecting element. The liquid crystal display module can adapt to the narrow space in the head-up display device, and the light utilization efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of head-up display technology, and in particular to a liquid crystal display module and a head-up display device. Background Technology

[0002] Head-up displays (HUDs) use optical reflection to project vehicle information, such as speed, onto the windshield or other glass, preventing drivers from looking down at the instrument panel and thus improving driving safety and the driving experience. Current HUDs typically use either Digital Light Processing (DLP) modules or LCD modules for their Picture Generation Unit (PGU). While DLP is more expensive, LCD modules offer advantages such as lower cost and easier mass production. However, current LCD modules are difficult to adapt to the structural layout of HUDs, leading to reduced light utilization efficiency. Summary of the Invention

[0003] Therefore, it is necessary to provide a liquid crystal display module and a head-up display device to address the problem that current liquid crystal display modules are difficult to adapt to the structural layout of head-up display devices, resulting in reduced light utilization efficiency.

[0004] A liquid crystal display module, comprising:

[0005] Backlight;

[0006] A light-concentrating cup has a reflective surface located on the light-emitting side of the backlight, the reflective surface being arranged around the light-emitting area of ​​the backlight;

[0007] The first reflective element is disposed on the light-emitting side of the condenser cup and is inclined to the main light emitted by the backlight;

[0008] A second reflective element, tilted relative to the first reflective element, is used to receive and reflect at least a portion of the light reflected by the first reflective element; and,

[0009] A liquid crystal panel, tilted relative to the second reflective element and located to the side of the backlight, is used to receive at least a portion of the light reflected by the second reflective element.

[0010] In the aforementioned liquid crystal display module, the first and second reflective elements work together to deflect the light emitted from the backlight, changing the angle between the light-emitting direction of the liquid crystal display module and the light-emitting direction of the backlight. This reduces the size of the liquid crystal display module in the light-emitting direction of the backlight, making it easier to fit into the narrow spaces within head-up display devices and facilitating installation. Simultaneously, the condenser cup focuses the light emitted from the backlight, reducing the diffusion angle of the emitted light. This ensures that the diffusion angle of the emitted light after passing through the first and second reflective elements is not excessive, increasing the proportion of light reaching the liquid crystal panel and thus improving the light utilization efficiency of the liquid crystal display module.

[0011] In some embodiments, the liquid crystal display module further includes a light-diffusing component, which is disposed between the light outlet of the light-concentrating cup and the first reflective element.

[0012] In some embodiments, the light-diffusing component includes a microlens array and a Fourier lens, wherein the Fourier lens is disposed on the side of the microlens array facing away from the light-diffusing cup.

[0013] In some embodiments, the liquid crystal display module further includes a light-blocking element disposed between the first reflective element and the liquid crystal panel, and spaced apart from the first reflective element, the liquid crystal panel and the second reflective element.

[0014] In some embodiments, the liquid crystal display module further includes a diffusion element disposed on the side of the liquid crystal panel facing the second reflective element.

[0015] In some embodiments, the condenser cup has a light inlet and a light outlet at its two ends, respectively. The light inlet is positioned corresponding to the light-emitting surface of the backlight, and the radial dimension of the light outlet is larger than that of the light inlet. The portion of the inner surface of the condenser cup located between the light inlet and the light outlet forms a reflective surface; and / or,

[0016] The reflective surface has an arc-shaped cross-section in the direction of light emission parallel to the backlight.

[0017] In some embodiments, the liquid crystal panel and the light emission direction of the backlight form an acute angle.

[0018] In some embodiments, the backlight source comprises a monolithic light source in a polycrystalline package.

[0019] A head-up display device includes a liquid crystal display module as described in any of the above embodiments.

[0020] In some embodiments, the system further includes a reflector and a curved reflective element. The reflector is disposed on the light-emitting side of the liquid crystal display module, and the curved reflective element is used to receive and reflect at least a portion of the reflected light from the reflector. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a head-up display device in some embodiments.

[0022] Figure 2 This is a schematic diagram of the structure of a liquid crystal display module in some embodiments.

[0023] Figure 3 for Figure 2 The diagram shows the structure of the liquid crystal display module from another angle.

[0024] Figure 4 for Figure 2 The image shows the ray tracing pattern of the liquid crystal display module.

[0025] Figure 5 This is a cross-sectional schematic diagram of the backlight, condenser cup, and light-diffusing assembly in some embodiments.

[0026] Figure label:

[0027] 10. Head-up display device; 12. Reflector; 14. Curved reflector; 16. Windshield; 20. Liquid crystal display module; 21. Backlight; 22. Condenser; 222. Reflective surface; 224. Light inlet; 226. Light outlet; 23. First reflective element; 24. Second reflective element; 25. Liquid crystal panel; 26. Light-diffusing assembly; 262. Microlens array; 264. Fourier lens; 27. Diffuser element; 28. Light-blocking element. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] Currently, the PGU (Power Placement Unit) in head-up display (HUD) devices is typically a DLP module or a liquid crystal display (LCD) module. HUDs using DLP modules often have a relatively flat and narrow installation space for the DLP module. Some HUDs initially test DLP modules as the PGU during design or manufacturing, later replacing them with LCD modules to reduce costs. However, traditional LCD modules are difficult to fit into the flat and narrow installation space reserved for DLP modules in HUDs, leading to installation difficulties. Using a reflective deflector for the LCD module's optical path, altering its spatial layout to accommodate the flat and narrow space, would lengthen the light propagation path between the backlight and the LCD panel, resulting in an excessively large divergence angle at the LCD panel. Large-angle light rays would fail to reach the LCD panel, increasing light energy loss and reducing light utilization efficiency.

[0035] To address the aforementioned issues, this application provides a liquid crystal display module and a head-up display device.

[0036] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the head-up display device 10 in some embodiments. Figure 2 This is a schematic diagram of the structure of the liquid crystal display module 20 in some embodiments. The head-up display device 10 provided in this application can be used in any suitable vehicle such as aircraft and automobiles. The head-up display device 10 is used to project driving information such as vehicle speed onto the windshield 16 to form a virtual image for the driver to view, avoiding the driver's distraction caused by looking down at the instrument panel during driving, thereby improving driving safety and driving experience.

[0037] In some embodiments, the head-up display device 10 includes a liquid crystal display module 20, a reflector 12, and a curved reflective element 14. The liquid crystal display module 20 can serve as an image generation unit (PGU) of the head-up display device 10. The reflector 12 can be glass coated with a reflective film and is disposed on the light-emitting side of the liquid crystal display module 20. The curved reflective element 14 includes, but is not limited to, a freeform reflector. The curved reflective element 14 is used to receive and reflect at least a portion of the reflected light from the reflector 12. At least a portion of the light emitted by the liquid crystal display module 20 is reflected by the reflector onto the curved reflective element 14, and then reflected by the curved reflective element 14 onto the windshield 16. The light is then reflected by the windshield 16 to the driver's eyes, allowing the driver to see a virtual image.

[0038] Combination Figure 2 and Figure 3 As shown, in some embodiments, the liquid crystal display module 20 includes a backlight 21, a reflector 22, a first reflective element 23, a second reflective element 24, and a liquid crystal panel 25. The backlight 21 is used to emit light, and the backlight 21 includes, but is not limited to, any suitable light source such as an LED light source. The reflector 22 has a reflective surface 222 located on the light-emitting side of the backlight 21. The reflective surface 222 is arranged around the light-emitting area of ​​the backlight 21. The reflector 22 can receive at least a portion of the light emitted by the backlight 21 and, after multiple reflections by the reflective surface 222, emit the light from the light-emitting port 226, thereby converging the light emitted by the backlight 21 and reducing the divergence angle of the beam. In other words, the beam diffusion angle emitted from the light-emitting port 226 of the reflector 22 is smaller than the beam diffusion angle emitted from the light-emitting surface of the backlight 21. The first reflective element 23 and the second reflective element 24 include, but are not limited to, any suitable optical element capable of reflecting light, such as glass coated with a reflective film. The first reflective element 23 is disposed on the light-emitting side of the condenser cup 22 and is inclined to the main light emitted by the backlight 21. For example, the normal of the first reflective element 23 forms an acute angle with the main light emitted by the backlight 21. The first reflective element 23 can receive and reflect at least a portion of the light emitted from the condenser cup 22. The second reflective element 24 is inclined to the first reflective element 23 and is used to receive and reflect at least a portion of the light reflected by the first reflective element 23. The liquid crystal panel 25 is inclined to the second reflective element 24 and is used to receive at least a portion of the light reflected by the second reflective element 24. The liquid crystal panel 25 may be located on the side of the backlight 21, and the side of the backlight 21 can be understood as the periphery of the light-emitting direction of the backlight 21. The liquid crystal panel 25 contains a liquid crystal molecule layer and is capable of optically modulating light before emitting it to form image light.

[0039] Combination Figure 4As shown in the ray tracing diagram, at least a portion of the light emitted from the backlight 21 is converged by the condenser cup 22 and exits from the light outlet 226 of the condenser cup 22 onto the first reflective element 23. The light is then reflected by the first reflective element 23 onto the second reflective element 24, and subsequently reflected by the second reflective element 24 onto the liquid crystal panel 25. After optical modulation by the liquid crystal panel 25, the light is emitted from the liquid crystal display module 20. Due to the deflection effect of the first reflective element 23 and the second reflective element 24 on the light path, the angle between the light emission direction of the liquid crystal display module 20 (the light emission direction of the liquid crystal panel 25) and the light emission direction of the backlight 21 can be adjusted. This adjusts the spatial layout of the liquid crystal display module 20, compresses the size of the liquid crystal display module 20 in the light emission direction of the backlight 21, and allows the liquid crystal display module 20 to adapt to the narrow and flat installation space of the head-up display device 10.

[0040] For example, in some embodiments, by designing the light emission direction of the backlight 21, the angle between the first reflective element 23, the second reflective element 24, and the liquid crystal panel 25, the light emission direction of the liquid crystal panel 25 forms an acute angle with the light emission direction of the backlight 21 and is located on the side of the backlight 21. This can effectively adjust the spatial shape of the liquid crystal display module 20, so that when the light emission direction of the liquid crystal panel 25 is opposite to the reflector 12 and adapts to the light path of the head-up display device 10, the spatial shape of the liquid crystal display module 20 can adapt to the narrow and flat installation space inside the head-up display device 10.

[0041] The aforementioned liquid crystal display module 20, with the first reflective element 23 and the second reflective element 24 working together, can deflect the light emitted by the backlight 21, changing the angle between the light emission direction of the liquid crystal display module 20 and the light emission direction of the backlight 21. This reduces the size of the liquid crystal display module 20 in the light emission direction of the backlight 21, adjusts the shape of the liquid crystal display module 20, and facilitates its adaptation to the narrow space within the head-up display device 10, making installation of the liquid crystal display module 20 more convenient. Simultaneously, the condenser cup 22 can focus the light emitted by the backlight 21, reducing the diffusion angle of the emitted light from the backlight 21. This ensures that the diffusion angle of the emitted light from the backlight 21 after passing through the first reflective element 23 and the second reflective element 24 is not too large, increasing the proportion of light reaching the liquid crystal panel 25, thereby improving the light utilization efficiency of the liquid crystal display module 20.

[0042] Of course, the light emission direction of the backlight 21, the angle between the first reflective element 23, the second reflective element 24, and the liquid crystal panel 25 are not limited. They can be specifically designed according to the installation space of the head-up display device 10 and the required light emission direction of the liquid crystal display module 20. As long as the light emission direction of the liquid crystal display module 20 is compatible with the optical path of the head-up display device 10, allowing the emitted light from the liquid crystal display module 20 to hit the reflector 12, and the shape of the liquid crystal display module 20 is compatible with the installation space of the head-up display device 10, this application does not impose any limitations. For example, in some embodiments, the angle between the light emission direction of the backlight 21 and the first reflective element 23 in the first direction is -10° to 45°, and the angle in the second direction is 0° to 40°. The angle between the first reflective element 23 and the second reflective element 24 in the first direction is 70° to 90°, and the angle in the second direction is -10° to 45°. The angle between the second reflective element 24 and the liquid crystal panel 25 in the first direction is -10° to 0°, and the angle in the second direction is 70° to 90°. The first and second directions are perpendicular; the first direction can be horizontal, and the second direction can be vertical.

[0043] It should be noted that, in this application, the description of the light-emitting side of a certain element can be understood as the side where the emitted light rays pass through the element, and the description of the light-emitting direction of a certain element can be understood as the direction of the main ray of the emitted light rays of the element.

[0044] In some embodiments, the liquid crystal display module 20 further includes a light homogenizing component 26, which is disposed between the light outlet 226 of the light condenser cup 22 and the first reflective element 23. The light homogenizing component 26 can homogenize at least a portion of the light emitted from the light condenser cup 22 before it is emitted onto the first reflective element 23, thereby improving the uniformity of the light emitted from the light condenser cup 22, preventing the influence of multiple reflections of the light condenser cup 22 on the uniformity of the light, and thus improving the display quality of the liquid crystal display module 20.

[0045] The specific configuration of the light homogenizing component 26 is not limited, as long as it can improve the uniformity of the light passing through the light homogenizing component 26. In some embodiments, the light homogenizing component 26 includes a microlens array 262 and a Fourier lens 264, with the Fourier lens 264 disposed on the side of the microlens array 262 facing away from the condenser cup 22. The microlens array 262 may include a glass substrate and a plurality of microlenses arranged in an array on the glass substrate. The glass substrate may have only one surface with the microlenses arranged in an array, or both opposite surfaces may have microlenses arranged in an array. The microlens array 262 may also consist of a plurality of microlenses arranged in an array on the surface of the Fourier lens 264. The microlens array 262 may be connected to the condenser cup 22. The Fourier lens 264, the microlens array 262, and the condenser cup 22 may also be three independent optical elements, relatively fixed by a supporting structure. The shape of the microlenses in the Fourier lens 264 and the microlens array 262 is not limited, as long as it can improve the uniformity of the light passing through the Fourier lens 264 and the microlens array 262. This application does not impose any limitations on this design.

[0046] In some embodiments, the liquid crystal display module 20 further includes a diffusion element 27, which is disposed on the side of the liquid crystal panel 25 facing the second reflective element 24. The diffusion element 27 can diffuse and homogenize the light emitted from the second reflective element 24 before projecting it onto the liquid crystal panel 25, further improving the uniformity of the light and thus improving the display quality of the liquid crystal display module 20. The diffusion element 27 includes, but is not limited to, any suitable homogenizing and diffusion optical element such as a diffusion sheet. The diffusion element 27 can be disposed on the side of the liquid crystal panel 25 facing the second reflective element 24, or it can be independent of the liquid crystal panel 25 and fixed relative to the liquid crystal panel 25 by a supporting structure.

[0047] The specific arrangement of the condenser cup 22 is not limited, as long as it can reduce the diffusion angle of at least a portion of the light emitted from the backlight source 21 after multiple reflections and project it onto the first reflective element 23. In some embodiments, the condenser cup 22 has a light inlet 224 and a light outlet 226 at its two ends, respectively. The light inlet 224 is positioned corresponding to the light-emitting surface of the backlight source 21. The backlight source 21 can be located outside the condenser cup 22, or in contact with the light inlet 224 of the condenser cup 22, or inside the condenser cup 22, as long as at least a portion of the light emitted by the backlight source 21 can enter the condenser cup 22 through the light inlet 224. The portion of the inner surface of the condenser cup 22 located between the light inlet 224 and the light outlet 226 forms a reflective surface 222. For example, the inner surface of the condenser cup 22 can be coated with a reflective film layer to form the reflective surface 222. In some embodiments, the radial dimension of the light outlet 226 is larger than the radial dimension of the light inlet 224, and the cross-sectional shape of the reflective surface 222 in the light-emitting direction parallel to the backlight 21 is arc-shaped. For example, the reflective surface 222 adopts a parabolic curved surface design, which can effectively reduce the loss of light in the condenser cup 22 and improve the light utilization efficiency while converging the light beam through multiple reflections.

[0048] In some embodiments, the liquid crystal display module 20 further includes a light-blocking element 28. The light-blocking element 28 is capable of absorbing at least a portion of the light incident on it. The light-blocking element 28 can be glass or plastic with light-absorbing films such as ink coated on both sides, or any other suitable element capable of blocking light. The light-blocking element 28 is disposed between the first reflective element 23 and the liquid crystal panel 25. The light-blocking element 28 is inclined or perpendicular to the second reflective element 24 and is spaced apart from the first reflective element 23, the liquid crystal panel 25, and the second reflective element 24. The light-blocking element 28 can be located outside the effective display light range of the liquid crystal display module 20, that is, outside the effective display light field range, and will not block the effective display light of the liquid crystal display module 20. In other words, the light emitted from the first reflective element 23, reflected by the second reflective element 24, and then projected onto the liquid crystal panel 25, forming the display light of the liquid crystal display module 20, can pass through the space between the light-blocking element 28 and the second reflective element 24 without being blocked by the light-blocking element 28, thus preventing the light-blocking element 28 from affecting the normal display of the liquid crystal display module 20. The light-blocking element 28 can block the light reflected from each element of the liquid crystal display module 20 onto the light-blocking element 28, preventing stray light from forming on these elements. This allows the liquid crystal display module 20 to maintain good display quality while using reflective elements such as the first reflective element 23 and the second reflective element 24 to deflect the light path. The specific orientation of the light-blocking element 28 and its relative angle with other elements are not limited, as long as they do not affect the normal display of the liquid crystal display module 20 and can block at least part of the stray light. This application does not impose any limitations on this.

[0049] In some embodiments, the backlight 21 adopts a monolithic LED light source with polycrystalline packaging. This reduces the density of LED distribution in the backlight 21 to prevent the backlight 21 from burning out due to excessive energy density, while improving the light emission efficiency of the backlight 21 itself. It also reduces the diffusion angle of the light emitted by the backlight 21. Combined with the setting of the light-concentrating cup 22, this helps to further reduce the diffusion angle of the light hitting the location of the liquid crystal panel 25, increasing the probability of light hitting the display panel, thereby further improving the light utilization efficiency of the liquid crystal display module 20.

[0050] Of course, the liquid crystal display module 20 provided in this application is not limited to the head-up display device 10 involved in this application, but can also be used in virtual image display devices in other applicable scenarios such as aircraft and desktop display devices. The liquid crystal display module 20 of this application can adjust the spatial layout of the liquid crystal display module 20 by reflecting the light path multiple times, thereby improving the light utilization efficiency of the liquid crystal display module 20 while adapting to different application scenarios.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A head-up display device, characterized in that, Includes a liquid crystal display module, the liquid crystal display module comprising: Backlight; A light-concentrating cup has a reflective surface located on the light-emitting side of the backlight, the reflective surface being arranged around the light-emitting area of ​​the backlight; The first reflective element is disposed on the light-emitting side of the condenser cup and is inclined to the main light emitted by the backlight; A second reflective element, tilted relative to the first reflective element, is used to receive and reflect at least a portion of the light reflected by the first reflective element; and, A liquid crystal panel, tilted relative to the second reflective element and located to the side of the backlight, is used to receive at least a portion of the light reflected by the second reflective element; The liquid crystal display module further includes a light-blocking element, which is disposed between the first reflective element and the liquid crystal panel, and is spaced apart from the first reflective element, the liquid crystal panel and the second reflective element; The first reflective element is opposite to the backlight in the light-emitting direction of the backlight, the light-receiving surface of the liquid crystal panel faces the side of the backlight, the light-blocking element is located between the backlight and the liquid crystal panel, and the plane of the light-blocking element intersects with the second reflective element. The light reflected by the first reflective element passes between the light-blocking element and the second reflective element. The light rays propagating between the backlight, the first reflective element, the second reflective element and the liquid crystal panel are not coplanar.

2. The head-up display device according to claim 1, characterized in that, The liquid crystal display module further includes a light-diffusing component, which is disposed between the light outlet of the light-concentrating cup and the first reflective element.

3. The head-up display device according to claim 2, characterized in that, The light-diffusing component includes a microlens array and a Fourier lens, with the Fourier lens located on the side of the microlens array facing away from the light-collecting cup.

4. The head-up display device according to claim 1, characterized in that, The liquid crystal display module further includes a diffusion element, which is disposed on the side of the liquid crystal panel facing the second reflective element.

5. The head-up display device according to claim 1, characterized in that, The light-concentrating cup has a light inlet and a light outlet at its two ends, respectively. The light inlet is set to correspond to the light-emitting surface of the backlight. The radial dimension of the light outlet is larger than that of the light inlet. The inner surface of the light-concentrating cup located between the light inlet and the light outlet forms a reflective surface.

6. The head-up display device according to claim 1, characterized in that, The reflective surface has an arc-shaped cross-section in the direction of light emission parallel to the backlight.

7. The head-up display device according to claim 1, characterized in that, The liquid crystal panel and the backlight source form an acute angle.

8. The head-up display device according to claim 1, characterized in that, The backlight source comprises a monolithic light source in a polycrystalline package.

9. The head-up display device according to claim 1, characterized in that, The head-up display device further includes a reflector and a curved reflective element. The reflector is located on the light-emitting side of the liquid crystal display module, and the curved reflective element is used to receive and reflect at least a portion of the reflected light from the reflector.

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