A head-up display device and a head-up display system

Abstract

The present invention relates to the technical field of head-up display. The present invention provides a head-up display device and a head-up display system. The head-up display device includes a backlight source, a collimating lens, a concave lens, and a liquid crystal screen, which are sequentially arranged from bottom to top; the light generated by the backlight source can sequentially reach the liquid crystal screen via the collimating lens and the concave lens; the concave surface of the concave lens is close to the liquid crystal screen and has a first preset distance from the liquid crystal screen; the concave lens is used to change the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal screen in a first preset direction. The head-up display device arranged in the above manner can make the light generated by the backlight source more collimated and use the concave lens for beam splitting, so that the light is reflected by a reflector and a windshield.

Description

Technical Field

[0001] The present invention relates to the technical field of head-up displays, and particularly to a head-up display device and a head-up display system. Background Art

[0002] The naked-eye 3D display technology, generally also known as the "naked-eye multi-viewpoint" technology, uses optical methods to enable people to see images with different parallaxes with their left and right eyes without any tools, and reflect them to the brain, so as to form a stereoscopic sensation in the brain. All along, the naked-eye 3D display technology has been one of the directions actively explored and pursued in the industry. When viewing the naked-eye 3D display technology, no auxiliary tools (such as glasses, helmets, etc.) need to be worn to create a realistic 3D effect.

[0003] The currently relatively mature naked-eye 3D display technologies include parallax barriers and lenticular gratings, etc., and these technologies have some insurmountable defects, such as low image resolution, easy visual fatigue after long-term viewing, etc., and the user experience is poor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is the poor image resolution in the above-mentioned prior art.

[0005] To solve the above technical problem, on the one hand, the present application discloses a head-up display device, which includes a backlight source, a collimating lens, a concave lens, and a liquid crystal screen arranged in sequence from bottom to top;

[0006] The light generated by the backlight source can reach the liquid crystal screen through the collimating lens and the concave lens in sequence;

[0007] The concave surface of the concave lens is close to the liquid crystal screen and has a first preset distance from the liquid crystal screen; the concave lens is used to change the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal screen in a first preset direction.

[0008] Optionally, the concave lens includes an opposite plane and a concave surface;

[0009] The plane is close to the collimating lens;

[0010] The concave surface includes a first end, a first curved end, a second end, and a second curved end connected in sequence;

[0011] The height of the first end from the plane is greater than the height of the second end from the plane.

[0012] Optionally, the backlight source includes a first backlight source and a second backlight source;

[0013] The collimating lens includes a first collimating lens and a second collimating lens;

[0014] The concave lens includes a first concave lens and a second concave lens that have a second preset distance.

[0015] Optionally, the second preset distance is a distance determined along a second preset direction;

[0016] The second preset direction is parallel to the plane where the bottom of the concave lens is located.

[0017] Optionally, the first end of the first concave lens is close to the first end of the second concave lens.

[0018] Optionally, the light rays emitted from the first concave lens reach at least part of the liquid crystal display screen in a first sub-preset direction;

[0019] The light rays emitted from the second concave lens reach at least part of the liquid crystal display screen in a second sub-preset direction; the first sub-preset direction and the second sub-preset direction are symmetric along the central axis of the head-up display device.

[0020] Optionally, the head-up display device further includes a mirror assembly, and the mirror assembly is used to reflect the light rays emitted by the liquid crystal display screen so that the light rays reach the eye box area.

[0021] Optionally, it further includes a first microlens array and a second microlens array; the mirror assembly includes a semi-transmissive semi-reflective mirror;

[0022] The liquid crystal display screen includes a first liquid crystal display screen and a second liquid crystal display screen;

[0023] The first backlight source, the first collimating lens, the first microlens array, the first concave lens, and the first liquid crystal display screen stacked in sequence form a first image generation component;

[0024] The second backlight source, the second collimating lens, the second microlens array, the second concave lens, and the second liquid crystal display screen stacked in sequence form a second image generation component;

[0025] The first image generation component is located on the first side of the semi-transmissive semi-reflective mirror;

[0026] The second image generation component is located on the second side of the semi-transmissive semi-reflective mirror opposite to the first side;

[0027] The central axis of the first image generation component and the normal line of the semi-transmissive semi-reflective mirror have a first preset angle;

[0028] The central axis of the second image generation component and the normal line of the semi-transmissive semi-reflective mirror have a second preset angle;

[0029] The difference between the first preset angle and the second preset angle is less than or equal to a preset threshold.

[0030] Optionally, the first liquid crystal display screen and the plane of the first concave lens have a third preset angle;

[0031] The second liquid crystal screen and the plane of the second concave lens have a fourth preset included angle.

[0032] Optionally, the second end and the first end of the first concave lens are arranged in sequence along the first direction;

[0033] The second end and the first end of the second concave lens are arranged in sequence along the second direction; the second direction is the reverse direction of the first direction.

[0034] Optionally, the central axis of the first image generation component is perpendicular to the central axis of the second image generation component.

[0035] On the other hand, the present application also discloses a head-up display system, which includes the above-mentioned head-up display device.

[0036] Optionally, the head-up display system further includes a windshield;

[0037] The light emitted by the liquid crystal screen reaches the eyebox area through the mirror component and the windshield in sequence.

[0038] Adopting the above technical solutions, the head-up display device provided by the present application has the following beneficial effects:

[0039] The head-up display device includes a backlight source, a collimating lens, a concave lens and a liquid crystal screen which are arranged in sequence from bottom to top; the light generated by the backlight source can reach the liquid crystal screen through the collimating lens and the concave lens in sequence; the concave surface of the concave lens is close to the liquid crystal screen and has a first preset distance from the liquid crystal screen; the concave lens is used to change the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal screen in a first preset direction.

[0040] The head-up display device with the above setting method improves the clarity of the subsequent displayed 3D image and reduces the fatigue of the human eyes during long-term viewing compared with the scheme of splitting light through a lenticular grating or a slit grating, which can improve the user experience. In addition, since the present application only needs to set two concave lenses between the backlight source and the liquid crystal screen to achieve the splitting of the image light of the liquid crystal screen, while in the conventional technical scheme of realizing splitting light by laminating a lenticular grating or a slit grating on the liquid crystal screen, the requirements for laminating and aligning the grating are relatively high, and the technical scheme of the present application can solve the problem of poor splitting effect caused by low lamination and alignment accuracy in the above scheme of realizing splitting light through a lenticular grating or a slit grating. In addition, the technical scheme of the present application can make the light generated by the backlight source more collimated, use the concave lens to split the light, and change the propagation direction of the light, so that the light enters the left and right eyes of the user respectively after being reflected by the mirror component and the windshield, so that the left and right eyes of the user can see images with different parallaxes, reflect them to the brain, and thus form a stereoscopic feeling in the brain, so that the user can see a realistic 3D image without wearing any auxiliary tools (such as glasses, helmets, etc.). Brief Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0042] Figure 1 It is a schematic structural diagram of the first optional head-up display device of the present application;

[0043] Figure 2 It is a schematic structural diagram of an optional concave lens of the present application;

[0044] Figure 3 It is a schematic structural diagram of the second optional head-up display device of the present application;

[0045] Figure 4 It is a schematic structural diagram of an optional head-up display system of the present application;

[0046] Figure 5 It is a schematic structural diagram of the third optional head-up display device of the present application;

[0047] Figure 6 It is a schematic combined structural diagram of an optional first concave lens and a first liquid crystal display screen of the present application;

[0048] Figure 7 It is a schematic structural diagram of another optional head-up display system of the present application;

[0049] Figure 8 is Figure 7 an enlarged view of a partial area of the head-up display system shown.

[0050] The following is a supplementary description of the drawings:

[0051] 1 - Backlight light source; 101 - First backlight light source; 102 - Second backlight light source; 2 - Collimating lens; 21 - First collimating lens; 22 - Second collimating lens; 3 - Concave lens; 31 - Plane; 32 - Concave surface; 321 - First end; 322 - First curved end; 323 - Second end; 324 - Second curved end; 33 - First concave lens; 34 - Second concave lens; 4 - Liquid crystal screen; 41 - First liquid crystal screen; 411 - First side; 42 - Second liquid crystal screen; 5 - First backlight assembly; 6 - Second backlight assembly; 7 - Mirror assembly; 71 - First mirror / semi-transmissive and semi-reflective mirror; 72 - Second mirror; 8 - Windshield; 9 - First image generation assembly; 10 - Second image generation assembly; 11 - First microlens array; 12 - Second microlens array; 13 - Image generation assembly. Detailed implementation mode

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0053] As used herein, the term "one embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0054] When a numerical range is disclosed in this document, the above range is considered continuous and includes the minimum and maximum values of the range, as well as every value between such minimum and maximum values. Further, when the range refers to integers, every integer between the minimum and maximum values of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein. For example, a specified range from "1 to 10" should be considered to include any and all sub-ranges between the minimum value 1 and the maximum value 10. Exemplary sub-ranges of the range 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0055] See Figure 1 , Figure 1 FIG. is a schematic structural diagram of a first optional head-up display device of the present application. The head-up display device includes a backlight source 1, a collimating lens 2, a concave lens 3, and a liquid crystal screen 4 arranged in sequence from bottom to top; the light generated by the backlight source 1 can reach the liquid crystal screen 4 successively through the collimating lens 2 and the concave lens 3; the concave surface 32 of the concave lens 3 is close to the liquid crystal screen 4 and has a first preset distance from the liquid crystal screen 4; the concave lens 3 is used to change the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal screen 4 in a first preset direction. The above arrangement improves the clarity of the subsequent displayed 3D image, reduces the fatigue of the human eye during long-term viewing, and can enhance the user experience.

[0056] In addition, since the present application only needs to set two concave lenses between the backlight source and the liquid crystal screen to achieve the splitting of the image light of the liquid crystal screen, while in the conventional technical solution of attaching a lenticular grating or a slit grating to the liquid crystal screen to achieve splitting, the requirements for the attachment and alignment of the grating are relatively high. The technical solution of the present application can solve the problem of poor splitting effect caused by low attachment and alignment accuracy in the above-mentioned solution of achieving splitting through a lenticular grating or a slit grating.

[0057] And the light generated by the backlight source is more collimated. The concave lens is used for splitting the light and changing the propagation direction of the light so that the light enters the left and right eyes of the user respectively after being reflected by the mirror assembly and the windshield, enabling the user's left and right eyes to see images with different parallaxes respectively. The user's brain performs fusion processing on the images seen by the left and right eyes, thereby forming a stereoscopic sensation in the brain, enabling the user to see a vivid 3D image without wearing any auxiliary tools (such as glasses, helmets, etc.).

[0058] In this embodiment, the above first preset direction refers to a certain direction area. Specifically, the first preset direction may include multiple sub-preset directions. See Figure 1, specifically related to the curvature of the curved surface of the concave lens; the light rays emitted through the concave lens do not necessarily need to completely cover the entire area of the liquid crystal screen, but need to completely cover the area of the liquid crystal screen used to display images, that is, it is necessary to cover the lit area of the liquid crystal screen used to display images.

[0059] In this embodiment, the above Figure 1 is only a schematic diagram. The above only describes the types of components that the head-up display device can include. For the specific number and position of the components, please refer to the following description.

[0060] In a feasible embodiment, in order to further improve the light splitting effect of the concave lens 3 for changing the light emission direction, so that the light can reach at least part of the area on the liquid crystal screen 4. Refer to Figure 2 , Figure 2 is a schematic structural diagram of an optional concave lens of the present application. The concave lens 3 includes an opposite plane 31 and a concave surface 32; the plane 31 is close to the collimating lens 2; the concave surface 32 includes a first end 321, a first curved end 322, a second end 323, and a second curved end 324 connected in sequence; the height of the first end 321 from the plane 31 is greater than the height of the second end from the plane 31.

[0061] Optionally, the first end and the second end can be straight lines (such as Figure 2 shown), and can also be curves, wavy lines, etc., which are not limited here.

[0062] In a feasible embodiment, refer to Figure 3 , Figure 3 is a schematic structural diagram of the second optional head-up display device of the present application. The backlight source 1 includes a first backlight source 101 and a second backlight source 102; the collimating lens 2 includes a first collimating lens 21 and a second collimating lens 22; the concave lens 3 includes a first concave lens 33 and a second concave lens 34 with a second preset distance.

[0063] In a feasible embodiment, as Figure 3 shown, the second preset distance is the distance determined along the second preset direction ( Figure 3 the x-axis direction in

[0064] ); the second preset direction is parallel to the plane 31 where the bottom of the concave lens 3 is located. Figure 3, that is, the first concave lens 33 and the second concave lens 34 are closely attached together.

[0065] In a feasible embodiment, the light emitted from the first concave lens 33 reaches at least part of the area of the liquid crystal screen 4 in the first sub-preset direction; the light emitted from the second concave lens 34 reaches at least part of the area of the liquid crystal screen 4 in the second sub-preset direction; the first sub-preset direction and the second sub-preset direction are symmetric along the central axis of the head-up display device.

[0066] Optionally, the above-mentioned first sub-preset direction and second sub-preset direction refer to a certain direction area. Specifically, both the first sub-preset direction and the second sub-preset direction include multiple directions. The first sub-preset direction and the second sub-preset direction are related to the surface parameters of the corresponding concave lens 3. As long as it is ensured that the light emitted from the first concave lens 33 and the second concave lens 34 can cover the area of the liquid crystal screen 4 where the image needs to be displayed, the areas of the displayed images covered by these two lenses are the same.

[0067] Optionally, the device further includes a first microlens array 11 and a second microlens array 12 。

[0068] The above-mentioned Figure 3 The principle of the head-up display device shown above to achieve 3D display is as follows:

[0069] The head-up display device includes two sets of backlight components; the first backlight component 5 includes the above-mentioned first backlight source 101, the first collimating lens 21 and the first concave lens 33; the second backlight component 6 includes the above-mentioned second backlight source 102, the second collimating lens 22 and the second concave lens 34; as Figure 3 In the left backlight component, that is, the first backlight component 5, the light emitted from the first backlight source 101 is collimated by the first collimating lens 21, then homogenized by the first microlens array 11, and then refracted by the first concave lens 33 to reach the liquid crystal screen 4; similarly, in the right backlight component, that is, the second backlight component 6, the light emitted from the second backlight source 102 is collimated by the second collimating lens 22, then homogenized by the second microlens array 12, and then refracted by the second concave lens 34 to reach the liquid crystal screen 4; next, the light emitted from the first concave lens 33 reaches the liquid crystal screen 4 and will light up the liquid crystal screen 4. The light emitted from the liquid crystal screen 4 will converge at a certain position in the outgoing light direction; similarly, the light emitted from the second concave lens 34 reaches the liquid crystal screen 4 and lights up the liquid crystal screen 4, and the light emitted from the liquid crystal screen 4 will converge at a certain position in the outgoing light direction.

[0070] Refer to Figure 4 , Figure 4 It is a schematic structural diagram of an optional head-up display system of the present application. Figure 4The head-up display device shown also includes a mirror assembly 7, which is used to reflect the image light emitted by the liquid crystal screen 4 so that the light reaches the eyebox area.

[0071] Optionally, the above two backlight assemblies and the liquid crystal screen 4 constitute an image generation component 13.

[0072] Refer to Figure 4 , the light emitted passively by the liquid crystal screen 4 in the image generation component 13 after being irradiated by the first concave lens 33, after passing through Figure 4 the mirror assembly 7 (i.e., the first mirror 71 and the second mirror 72) and the windshield 8 in, can reach the user's left eye and right eye respectively, so that the left and right eyes can see the 3D virtual image formed by reflection through the windshield 8. Optionally, the first mirror 71 can be a plane mirror or a free-form curved mirror; the second mirror 72 can be a free-form curved mirror.

[0073] The above Figure 3 In the actual control process of the head-up display device shown, it is necessary to alternately control the on and off of the first backlight source 101 of the first backlight assembly 5 and the second backlight source 102 of the second backlight assembly 6, so that there is a time difference in the light received by the left and right eyes, which requires a high computing power. To improve the above problems, in another feasible embodiment, refer to Figure 3 and Figure 5 , Figure 5 is a schematic structural diagram of the third optional head-up display device of the present application. The first mirror 71 is a semi-transmissive and semi-reflective mirror. The first backlight source 101, the first collimating lens 21, the first microlens array 11, the first concave lens 33 and the first liquid crystal screen 41 are stacked in sequence to form a first image generation component 9; the second backlight source 102, the second collimating lens 22, the second microlens array 12, the second concave lens 34 and the second liquid crystal screen 42 are stacked in sequence to form a second image generation component 10; the first image generation component 9 is located on the first side of the semi-transmissive and semi-reflective mirror 71; the second image generation component 10 is located on the second side of the semi-transmissive and semi-reflective mirror 71 opposite to the first side; the central axis of the first image generation component 9 has a first preset angle with the normal of the semi-transmissive and semi-reflective mirror 71; the central axis of the second image generation component 10 has a second preset angle with the normal of the semi-transmissive and semi-reflective mirror 71; the difference between the first preset angle and the second preset angle is less than or equal to a preset threshold.

[0074] To simplify the design of the head-up display device, optionally, refer to Figure 5 , the central axis of the first image generation component 9 is perpendicular to the x-axis, and the central axis of the second image generation component is parallel to the x-axis. In another optional implementation manner, the first preset angle is equal to the second preset angle.

[0075] In a feasible embodiment, there is a third preset angle between the plane 31 of the first liquid crystal screen 41 and the first concave lens 33; there is a fourth preset angle between the plane 31 of the second liquid crystal screen 42 and the second concave lens 34.

[0076] Optionally, the range of the third preset angle is 10 to 30 degrees; the range of the fourth preset angle is 10 to 30 degrees.

[0077] Since the first end 321 of the concave lens 3 is the end with a higher height, in order to enable the light emitted by the liquid crystal screen 4 to effectively reach the semi-transmissive semi-reflective mirror 71. Optionally, when the head-up display device is arranged in the manner as Figure 5 shown, the second end and the first end of the first concave lens 33 are arranged in sequence along the first direction; the second end and the first end of the second concave lens 34 are arranged in sequence along the second direction; the second direction is the reverse direction of the first direction, and the first direction can be Figure 5 the positive z-axis direction in Figure 5 , and the second direction can be Figure 6 the negative z-axis direction in Figure 6 ; specifically, referring to Figure 6 , Figure 6 is a schematic diagram of a combined structure of an optional first concave lens and a first liquid crystal display screen of the present application. The first direction can be

[0078] the positive z-axis direction in Figure 5 , and the second direction can be

[0079] the negative z-axis direction in

[0080] Figure 6 ; when both the first liquid crystal display screen 41 and the second liquid crystal display screen 42 are cuboids, for the first concave lens 33, the first liquid crystal display screen 41 includes opposite first side surface 411 and second side surface, and both the first side surface 411 and the second side surface are composed of two longest sides and two short sides. The first side surface 411 is close to the first end 321 of the first concave lens 33, and the second side surface is close to the second end 323 of the first concave lens 33; similarly, for the second concave lens 34, the first side surface of the second liquid crystal display screen is close to the first end of the second concave lens 34, and the second side surface of the second liquid crystal display screen is close to the second end of the second concave lens 34.

[0078] Optionally, the central axis of the first image generation component 9 is perpendicular to the central axis of the second image generation component 10. Specifically, the central axis of the first image generation component 9 can be perpendicular to the horizontal plane (such as Figure 5 the x-axis in

[0079] ), and the central axis of the second image generation component 10 can be parallel to the horizontal plane. Thus, a better naked-eye 3D display effect can be achieved. Optionally, the first collimating lens 21 of the first image generation component 9, the principal optical axis of the first concave lens 33 coincide with the center of the first liquid crystal screen 41; similarly, the second collimating lens 22 in the second image generation component 10, the principal optical axis of the second concave lens 34 coincide with the center of the second liquid crystal screen 42.

[0080] In some embodiments, referring to Figure 7 and Figure 8 , Figure 7 is a schematic structural diagram of another optional head-up display system of the present application; Figure 8 is Figure 7 an enlarged view of the dashed area in Figure 8 , which more intuitively shows the Figure 5 positional relationship among the first image generation component 9, the second image generation component 10, the semi-transmissive and semi-reflective mirror 71, and the second reflector 72 in the embodiment shown. Specifically, Figure 7 the schematic diagram shown is a side view after the HUD is installed on the vehicle head unit. Assuming the perspective shown in Figure 7 is used as a reference, then referring to Figure 8 , the first end 321 of the first concave lens 33 is on the outside, and the second end 323 is on the inside, that is, the highest plane of the first concave lens 33 faces the outside (the side close to the user), and the lowest plane of the first concave lens 33 faces the inside (the side far from the user). The second end 323 of the second concave lens 34 is on the outside, and the first end 321 is on the inside, that is, the highest plane of the second concave lens 34 faces the inside (the side far from the user), and the lowest plane of the second concave lens 34 faces the outside (the side close to the user). Through the Figure 7 and Figure 8 positional arrangement of each device in the embodiment shown, the light emitted from the first liquid crystal screen 41 can have directivity after being reflected by the semi-transmissive and semi-reflective mirror 71, and Figure 3 the directivity of the light emitted from the first backlight assembly 5 after passing through the liquid crystal screen 4 in the embodiment shown is the same, and the light emitted from the second liquid crystal screen 42 can have directivity after passing through the semi-transmissive and semi-reflective mirror 71, and Figure 4 the directivity of the light emitted from the second backlight assembly 6 after passing through the liquid crystal screen 4 in the embodiment shown is the same, having a good light splitting effect. And it is not necessary to alternately control the opening and closing of the first backlight assembly 5 and the second backlight assembly 6, which can reduce the computing power requirement and has a wider application.

[0081] The principle of the above Figure 5 shown head-up display device to achieve 3D display is as follows:

[0082] The first image generation component 9 is used to generate an image corresponding to the left eye, the second image generation component 10 is used to generate an image corresponding to the right eye, and the two head-up display devices are symmetric about the semi-transmissive and semi-reflective mirror 71. The first backlight source 101 of the first image generation component 9 is incident on the surface of the first liquid crystal screen 41 after being split by the first collimating lens 21, the first microlens array 11, and the first concave lens 33, and then is reflected by the semi-transmissive and semi-reflective mirror 71 to the second reflector 72.

[0083] After the second backlight source 102 of the second image generation component 10 is split by the second collimating lens 22, the second microlens array 12, and the second concave lens 34 and then irradiates the second liquid crystal screen 42, it is transmitted to the second reflector 72 through the semi-transmissive and semi-reflective mirror 71. The size of the semi-transmissive and semi-reflective mirror 71 can completely cover the area displayed by the corresponding liquid crystal screen 4. In this way, the left and right eyes can respectively receive two images with parallax, generating a stereoscopic effect.

[0084] In the process of designing the head-up display device in the present application, according to the principle of reversibility of the optical path, the directional backlight can be designed in reverse and optimized. For example, according to the angle of the imaging light (the angle of the light emitted from the surface of the liquid crystal screen 4), the light-emitting angle of the set backlight source 1 is calculated. After the light emits at a specific angle, it can pass through the collimating lens and the concave lens 3, making the light as collimated as possible. The surface shape of the concave lens 3 is a free-form surface. In this process, it is mainly necessary to optimize the concave lens 3 to make the outgoing light passing through the concave lens 3 collimated; after optimizing the concave lens 3, a light collimation device needs to be designed in the light collimation part. Reversing the optical path, the light source is collimated by the collimating lens 2, split by the concave lens 3, and irradiates the liquid crystal screen 4. Ideally, the light passes through the surface of the liquid crystal screen 4, and after passing through the reflector assembly 7 and the windshield 8, different image lights are received by the two eyes in the eye box area.

[0085] The head-up display device provided by the present application has the advantages of small volume and simple structure.

[0086] On the other hand, the present application also discloses a head-up display system, which includes the above-mentioned head-up display device.

[0087] In a feasible embodiment, refer to Figure 7 , the head-up display system further includes a windshield 8; optionally, the head-up display device can be a distributed structure as shown in Figure 5 . The first reflector 71 is a semi-transmissive and semi-reflective mirror. The first reflector 71 can reflect the light emitted by the first liquid crystal screen 41 to the second reflector 72; transmit the light emitted by the second liquid crystal screen 42 to the second reflector 72, and then the second reflector 72 reflects the light through the windshield 8 to the human eye.

[0088] In Figure 3 , Figure 5 and Figure 7In the embodiment, the light emitted from the first image generation component 9 is reflected by using the semi-transmissive and semi-reflective mirror 71, and the light emitted from the second image generation component 10 is transmitted by using the semi-transmissive and semi-reflective mirror 71. The first backlight component 5 in the first image generation component 9 makes the light emitted from the first liquid crystal screen 41 directional and finally enters the left eye of the user. The second backlight component 6 in the second image generation component 10 makes the light emitted from the second liquid crystal screen 42 directional and finally enters the right eye of the user. It is possible to control the first backlight component 5 and the second backlight component 6 to work simultaneously without controlling the opening and closing of the first backlight component 5 and the second backlight component 6, and the computing power requirement is relatively low.

[0089] Optionally, the head-up display system may also have a structure as shown in Figure 4 Accordingly, the head-up display device may include a structure as shown in Figure 3 For details, see the above description and will not be elaborated here.

[0090] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A head-up display device, characterized in that, It includes a backlight source (1), a collimating lens (2), a concave lens (3), and a liquid crystal display screen (4) arranged successively from bottom to top; The backlight source (1) includes a first backlight source (101) and a second backlight source (102); The collimating lens (2) includes a first collimating lens (21) and a second collimating lens (22); The concave lens (3) includes an opposite plane (31) and a concave surface (32); the plane (31) is close to the collimating lens (2); the concave surface (32) includes a first end (321), a first curved end (322), a second end (323), and a second curved end (324) connected in sequence; the height of the first end (321) from the plane (31) is greater than the height of the second end (323) from the plane (31); The concave lens (3) includes a first concave lens (33) and a second concave lens (34) with a second preset distance; the second preset distance is the distance determined along a second preset direction; the second preset direction is parallel to the plane (31) where the bottom of the concave lens (3) is located; the first end (321) of the first concave lens (33) is close to the first end (321) of the second concave lens (34); the light emitted from the first concave lens (33) reaches at least part of the area of the liquid crystal display screen (4) in a first sub-preset direction; the light emitted from the second concave lens (34) reaches at least part of the area of the liquid crystal display screen (4) in a second sub-preset direction; the first sub-preset direction and the second sub-preset direction are symmetric along the central axis of the head-up display device; the light generated by the backlight source (1) can reach the liquid crystal display screen (4) successively through the collimating lens (2) and the concave lens (3); The concave surface (32) of the concave lens (3) is close to the liquid crystal display screen (4) and has a first preset distance from the liquid crystal display screen (4); the concave lens (3) is used to change the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal display screen (4) in a first preset direction.

2. The head-up display device according to claim 1, wherein It further includes a mirror assembly (7); The mirror assembly (7) is used to reflect the light emitted by the liquid crystal display screen (4) so that the light reaches the eyebox area.

3. The head-up display device according to claim 2, wherein It further includes a first microlens array (11) and a second microlens array (12); The mirror assembly (7) includes a semi-transmissive semi-reflective mirror (71); The liquid crystal display screen (4) includes a first liquid crystal display screen (41) and a second liquid crystal display screen (42); The first backlight source (101), the first collimating lens (21), the first microlens array (11), the first concave lens (33), and the first liquid crystal display screen (41) stacked in sequence constitute a first image generation component (9); The second backlight source (102), the second collimating lens (22), the second microlens array (12), the second concave lens (34), and the second liquid crystal display screen (42) stacked in sequence constitute a second image generation component (10); The first image generation component (9) is located on the first side of the semi-transmissive semi-reflective mirror (71); The second image generation component (10) is located on the second side of the semi-transmissive semi-reflective mirror (71) opposite to the first side; There is a first preset angle between the central axis of the first image generation component (9) and the normal of the semi-transmissive semi-reflective mirror (71); There is a second preset angle between the central axis of the second image generation component (10) and the normal of the semi-transmissive semi-reflective mirror (71); The difference between the first preset angle and the second preset angle is less than or equal to a preset angle threshold.

4. The head-up display device according to claim 3, characterized in that, There is a third preset angle between the first liquid crystal screen (41) and the plane (31) of the first concave lens (33); There is a fourth preset angle between the second liquid crystal screen (42) and the plane (31) of the second concave lens (34).

5. The head-up display device according to claim 3, characterized in that The second end and the first end of the first concave lens (33) are arranged in sequence along a first direction; The second end and the first end of the second concave lens (34) are arranged in sequence along a second direction; the second direction is the reverse direction of the first direction.

6. The head-up display device according to claim 5, wherein The central axis of the first image generation component (9) is perpendicular to the central axis of the second image generation component (10).

7. A head-up display system, characterized in that, Comprising a head-up display device according to any one of claims 1-6 and a windshield (8); The head-up display system is configured such that the light emitted by the liquid crystal screen (4) reaches the eye box area successively through the mirror assembly (7) and the windshield (8).

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