CN116107088A

CN116107088A - Head-up display device and head-up display system

Info

Publication number: CN116107088A
Application number: CN202211428923.8A
Authority: CN
Inventors: 高昌达; 王云帆
Original assignee: Zhejiang Chiyun Technology Co ltd
Current assignee: Zhejiang Chiyun Technology Co ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-05-12

Abstract

The invention relates to the technical field of head-up display, and provides a head-up display device and a head-up display system. The head-up display device comprises a backlight light source, a collimating lens, a concave lens and a liquid crystal screen which are sequentially arranged from bottom to top; light generated by the backlight light source can sequentially reach the liquid crystal screen through 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 with the liquid crystal screen; the concave lens is used for changing the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal screen according to the first preset direction. The head-up display device with the arrangement mode can lead the light generated by the backlight light source to be more straight and split light by utilizing the concave lens, thereby leading the light to be reflected by the reflecting mirror and the windshield.

Description

Head-up display device and head-up display system

Technical Field

The invention relates to the technical field of head-up display, in particular to a head-up display device and a head-up display system.

Background

The naked eye 3d display technology, which is also commonly referred to as "naked eye multi-viewpoint" technology, is to optically make a person see images with different parallaxes through both left and right eyes, respectively, without any tools, and reflect them to the brain, thereby forming a stereoscopic sensation in the brain. Conventionally, naked eye 3d display technology is one of the directions of active exploration and pursuit in the industry. The naked eye 3d display technology can create a realistic 3d effect without wearing any auxiliary tools (such as glasses, helmets and the like) when being watched.

The existing mature naked eye 3d display technology comprises a parallax barrier, a lenticular lens and the like, and the technology has some defects which cannot be overcome, such as low image resolution, easiness in generating visual fatigue after long-term watching and the like, and poor user experience.

Disclosure of Invention

The invention aims to solve the technical problem of poor image resolution in the prior art.

In order to solve the technical problems, in one aspect, the application discloses a head-up display device, which comprises a backlight light source, a collimating lens, a concave lens and a liquid crystal screen which are sequentially arranged from bottom to top;

light generated by the backlight light source can sequentially reach the liquid crystal screen through 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 with the liquid crystal screen; the concave lens is used for changing the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal screen according to the first preset direction.

Optionally, the concave lens comprises opposing planar and concave surfaces;

the plane is close to the collimating lens;

the concave surface comprises a first end, a first curve end, a second end and a second curve end which are sequentially connected;

the first end has a greater height from the plane than the second end.

Optionally, the backlight source comprises a first backlight source and a second backlight source;

the collimating lens comprises a first collimating lens and a second collimating lens;

the concave lenses include a first concave lens and a second concave lens having a second preset distance.

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

the second preset direction is parallel to the plane of the bottom of the concave lens.

Optionally, the first end of the first concave lens is adjacent to the first end of the second concave lens.

Optionally, the light emitted by the first concave lens reaches at least part of the area of the liquid crystal screen according to the first sub-preset direction;

the light rays emitted by the second concave lens reach at least part of the area of the liquid crystal screen according to the second sub-preset direction; the first sub-preset direction and the second sub-preset direction are symmetrical along the central axis of the head-up display device.

Optionally, the head-up display device further includes a reflector assembly, and the reflector assembly is configured to reflect light emitted by the liquid crystal screen, so that the light reaches the eye box area.

Optionally, the method further comprises a first microlens array and a second microlens array; the reflector assembly includes a half mirror;

the liquid crystal screen comprises a first liquid crystal screen and a second liquid crystal screen;

the first backlight light source, the first collimating lens, the first micro lens array, the first concave lens and the first liquid crystal screen are sequentially stacked to form a first image generation assembly;

the second backlight light source, the second collimating lens, the second micro-lens array, the second concave lens and the second liquid crystal screen are sequentially stacked to form a second image generating assembly;

the first image generating component is positioned on the first side of the half-mirror;

the second image generating assembly is positioned on a second side of the half mirror opposite to the first side;

a first preset included angle exists between the central axis of the first image generating assembly and the normal line of the half mirror;

a second preset included angle exists between the central axis of the second image generating assembly and the normal line of the half-mirror;

the difference value between the first preset included angle and the second preset included angle is smaller than or equal to a preset threshold value.

Optionally, a third preset included angle exists between the first liquid crystal screen and the plane of the first concave lens;

the second liquid crystal screen and the plane of the second concave lens form a fourth preset included angle.

Optionally, the second end and the first end of the first concave lens are sequentially arranged along the first direction;

the second end and the first end of the second concave lens are sequentially arranged along a second direction; the second direction is the opposite direction of the first direction.

Optionally, the central axis of the first image generating component is perpendicular to the central axis of the second image generating component.

In another aspect, the application also discloses a head-up display system, which comprises the head-up display device.

Optionally, the head-up display system further comprises a windshield;

light emitted by the liquid crystal screen sequentially passes through the reflector assembly and the windshield to reach the eye box area.

By adopting the technical scheme, the head-up display device provided by the application has the following beneficial effects:

the head-up display device comprises a backlight light source, a collimating lens, a concave lens and a liquid crystal screen which are sequentially arranged from bottom to top; light generated by the backlight light source can sequentially reach the liquid crystal screen through 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 with the liquid crystal screen; the concave lens is used for changing the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal screen according to the first preset direction.

Compared with the scheme of carrying out light splitting through the lenticular grating or the slit grating, the head-up display device of the setting mode improves the definition of the subsequently displayed 3D image, reduces the fatigue of watching human eyes for a long time, and can improve the user experience. In addition, as the application can realize the light splitting of the image light of the liquid crystal screen only by arranging two concave lenses between the backlight source and the liquid crystal screen, the conventional technical scheme for realizing the light splitting by attaching the cylindrical lens grating or the slit grating on the liquid crystal screen has higher requirements on the attaching and aligning of the gratings, and the technical scheme can solve the problem of poor light splitting effect caused by low attaching and aligning precision in the scheme for realizing the light splitting by the cylindrical lens grating or the slit grating. In addition, the technical scheme can make the light produced by the backlight source more straight, utilize concave lens to split light to change the propagation direction of this light, so that this light gets into user's left eye and right eye respectively through the reflection of speculum subassembly and windshield again, make user's left and right eyes see the image of different parallaxes respectively, reflect them to the brain, thereby form the stereoscopic impression in the brain, make the user just can see lifelike 3D image without wearing any appurtenance (such as glasses, helmet etc.).

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a first alternative head-up display device according to the present application;

FIG. 2 is a schematic view of an alternative concave lens structure according to the present application;

FIG. 3 is a schematic diagram of a second alternative head-up display device according to the present application;

FIG. 4 is a schematic diagram of an alternative head-up display system according to the present application;

FIG. 5 is a schematic diagram of a third alternative head-up display device according to the present application;

FIG. 6 is a schematic diagram showing a combination structure of an alternative first concave lens and a first LCD screen;

FIG. 7 is a schematic diagram of another alternative head-up display system according to the present application;

fig. 8 is an enlarged view of a partial area of the head-up display system shown in fig. 7.

The following supplementary explanation is given to the accompanying drawings:

1-a backlight source; 101-a first backlight source; 102-a second backlight source; 2-a collimating lens; 21-a first collimating lens; 22-a second collimating lens; 3-concave lenses; 31-plane; 32-concave; 321-a first end; 322-first curve end; 323-a second end; 324-second curve end; 33-a first concave lens; 34-a second concave lens; 4-a liquid crystal screen; 41-a first liquid crystal screen; 411-first side; 42-a second liquid crystal screen; 5-a first backlight assembly; 6-a second backlight assembly; 7-a mirror assembly; 71-a first mirror/half mirror; 72-a second mirror; 8-a windshield; 9-a first image generation component; 10-a second image generation component; 11-a first microlens array; 12-a second microlens array; 13-an image generation component.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic 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 terms "upper," "lower," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the apparatus or elements in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values for the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein. For example, a specified range from "1 to 10" should be considered to include any and all subranges between the minimum value of 1 and the maximum value of 10. Exemplary subranges from 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, and the like.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first alternative head-up display device according to the present application. The head-up display device comprises a backlight light source 1, a collimating lens 2, a concave lens 3 and a liquid crystal screen 4 which are sequentially arranged from bottom to top; light generated by the backlight source 1 can reach the liquid crystal screen 4 through the collimating lens 2 and the concave lens 3 in sequence; 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 panel 4 according to a first preset direction. The setting mode improves the definition of the subsequently displayed 3D image, reduces the fatigue of the eyes of people for long-time watching, and can improve the user experience.

In addition, as the application can realize the light splitting of the image light of the liquid crystal screen only by arranging two concave lenses between the backlight source and the liquid crystal screen, the conventional technical scheme for realizing the light splitting by attaching the cylindrical lens grating or the slit grating on the liquid crystal screen has higher requirements on the attaching and aligning of the gratings, and the technical scheme can solve the problem of poor light splitting effect caused by low attaching and aligning precision in the scheme for realizing the light splitting by the cylindrical lens grating or the slit grating.

The light generated by the backlight source is more collimated, the concave lens is utilized for light splitting, and the propagation direction of the light is changed, so that the light is reflected by the reflecting mirror component and the windshield to enter the left eye and the right eye of a user respectively, the left eye and the right eye of the user respectively see images with different parallaxes, the images seen by the left eye and the right eye of the user are fused by the brain of the user, a stereoscopic sensation is formed in the brain, and the user can see a vivid 3D image without wearing any auxiliary tool (such as glasses, helmets and the like).

In this embodiment, the first preset direction refers to a certain direction area, and specifically, the first preset direction may include a plurality of sub preset directions, referring to fig. 1, specifically, the first preset direction is related to the curvature of the curved surface of the concave lens; the light emitted through the concave lens does not necessarily have to entirely cover the entire area of the liquid crystal panel, but entirely cover the area for displaying an image in the liquid crystal panel, that is, the area for displaying an image that is lit in the liquid crystal panel.

In this embodiment, fig. 1 is only a schematic diagram, and the description is only illustrative of the types of components that the head-up display device may include, and the specific number and positions of the components are described in detail below.

In a possible embodiment, in order to further enhance the light splitting effect of the concave lens 3 in changing the light emitting direction, the light can reach at least a partial area on the liquid crystal panel 4. Referring to fig. 2, fig. 2 is a schematic structural view of an alternative concave lens according to the present application. The concave lens 3 includes opposing flat surfaces 31 and concave surfaces 32; the plane 31 is close to the collimator 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 first end 321 has a height from the plane 31 that is greater than the height of the second end from the plane 31.

Alternatively, the first end and the second end may be straight lines (as shown in fig. 2), curved lines, wave folds, etc., which are not limited herein.

In one possible embodiment, referring to fig. 3, fig. 3 is a schematic structural diagram of a second alternative 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 collimator lens 2 includes a first collimator lens 21 and a second collimator lens 22; the concave lens 3 includes a first concave lens 33 and a second concave lens 34 that are present at a second preset distance.

In one possible embodiment, as shown in fig. 3, the second preset distance is a distance determined along a second preset direction (x-axis direction in fig. 3); the second predetermined direction is parallel to the plane 31 in which the bottom of the concave lens 3 lies.

In one possible embodiment, the first end 321 of the first concave lens 33 is adjacent to the first end 321 of the second concave lens 34. Thereby ensuring that the space occupation volume of the whole head-up display device is smaller. In essence, the second predetermined distance and the surface shape of the curved surface of the concave lens 3 can be determined comprehensively according to the requirement of the exit angle of the concave lens 3, the material of the concave lens 3, the size of the liquid crystal panel 4 and the size of the occupied space of the head-up display device. Alternatively, the second predetermined distance may be equal to zero, referring to fig. 3, that is, the first concave lens 33 and the second concave lens 34 are closely adhered together.

In a possible embodiment, the light emitted through the first concave lens 33 reaches at least a part of the area of the liquid crystal panel 4 according to the first sub-preset direction; the light rays emitted through the second concave lens 34 reach at least part of the area of the liquid crystal display 4 according to the second sub-preset direction; the first sub-preset direction and the second sub-preset direction are symmetrical along the central axis of the head-up display device.

Optionally, the first sub-preset direction and the second sub-preset direction refer to a certain direction area, specifically, the first sub-preset direction and the second sub-preset direction each include a plurality of directions, the first sub-preset direction and the second sub-preset direction are related to the curved surface parameters of the corresponding concave lens 3, so long as the light emitted through 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, and the areas of the displayed image covered by the two lenses are the same.

Optionally, the device further comprises a first microlens array 11 and a second microlens array 12 _。

The principle of implementing 3D display by the head-up display device shown in fig. 3 is as follows:

the head-up display device comprises two sets of backlight assemblies; the first backlight assembly 5 includes the above-described first backlight light source 101, first collimating lens 21, and first concave lens 33; the second backlight assembly 6 includes the above-described second backlight light source 102, second collimator lens 22, and second concave lens 34; the backlight assembly shown in fig. 3, namely, the first backlight assembly 5, wherein the light emitted from the first backlight source 101 is collimated by the first collimating lens 21, homogenized by the first microlens array 11, and refracted by the first concave lens 33 to reach the lcd 4; similarly, the light emitted from the second backlight source 102 of the right backlight assembly, namely the second backlight assembly 6, is collimated by the second collimating lens 22, homogenized by the second micro lens array 12, and refracted by the second concave lens 34 to reach the liquid crystal display 4; then, after the light emitted from the first concave lens 33 reaches the liquid crystal screen 4, the liquid crystal screen 4 is turned on, and the light emitted from the liquid crystal screen 4 is converged at a certain position in the direction of the emitted light; similarly, after the light emitted from the second concave lens 34 reaches the liquid crystal panel 4, the liquid crystal panel 4 is turned on, and the light emitted from the liquid crystal panel 4 is converged at a certain position in the light emitting direction.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an alternative head-up display system according to the present application. The head-up display device shown in fig. 4 further comprises a mirror assembly 7, the mirror assembly 7 being adapted to reflect image light emitted by the liquid crystal display 4 such that said light reaches the eye-box area.

Alternatively, the image generating assembly 13 is constituted by the above two sets of backlight assemblies and the liquid crystal panel 4.

Referring to fig. 4, the light passively emitted by the lcd 4 of the image generating assembly 13 after being irradiated by the first concave lens 33 is reflected by the mirror assembly 7 (i.e., the first mirror 71 and the second mirror 72) and the windshield 8 of fig. 4, and then reaches the left eye and the right eye of the user, respectively, so that the left eye and the right eye can see the 3D virtual image formed by the reflection of the windshield 8. Alternatively, the first reflecting mirror 71 may be a plane mirror or a free-surface curved mirror; the second mirror 72 may be a free-surface curved mirror.

In the above-mentioned head-up display device shown in fig. 3, in the actual control process, it is necessary to alternately control the opening and closing 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 between the left eye and the right eye for receiving light, and the calculation force requirement is high, and in order to improve the above-mentioned problem, in another possible embodiment, referring to fig. 3 and 5, fig. 5 is a schematic structural diagram of a third alternative head-up display device of the present application. The first reflecting mirror 71 is a half mirror, and the first backlight light source 101, the first collimating lens 21, the first microlens array 11, the first concave lens 33, and the first liquid crystal panel 41, which are sequentially stacked, constitute a first image generating unit 9; the second backlight light source 102, the second collimator lens 22, the second microlens array 12, the second concave lens 34, and the second liquid crystal panel 42, which are sequentially stacked, constitute a second image generation assembly 10; the first image generation assembly 9 is located on a first side of the half mirror 71; the second image generation assembly 10 is located on a second side of the half mirror 71 opposite the first side; a first preset included angle exists between the central axis of the first image generating assembly 9 and the normal line of the half mirror 71; a second preset included angle exists between the central axis of the second image generating assembly 10 and the normal line of the half mirror 71; the difference value between the first preset included angle and the second preset included angle is smaller than or equal to a preset threshold value.

In order to simplify the design of the head-up display device, optionally, referring to fig. 5, the central axis of the first image generating assembly 9 is perpendicular to the x-axis, and the central axis of the second image generating assembly is parallel to the x-axis. In another alternative embodiment, the first predetermined angle is equal to the second predetermined angle.

In a possible embodiment, the first liquid crystal screen 41 forms a third predetermined angle with the plane 31 of the first concave lens 33; the second liquid crystal screen 42 forms a fourth predetermined angle with the plane 31 of the second concave lens 34.

Optionally, the third preset included angle ranges from 10 degrees to 30 degrees; the fourth preset included angle is 10-30 degrees.

Since the first end 321 of the concave lens 3 is a higher end, the light emitted from the lcd panel 4 can effectively reach the half mirror 71. Alternatively, when the head-up display device is arranged in the manner shown in fig. 5, the second end and the first end of the first concave lens 33 are sequentially arranged in the first direction; the second end and the first end of the second concave lens 34 are sequentially arranged along the second direction; the second direction is the opposite direction of the first direction, which may be the positive z-axis direction in fig. 5, and the second direction may be the negative z-axis direction in fig. 5; specifically, referring to fig. 6, fig. 6 is a schematic diagram illustrating an optional combination structure of a first concave lens and a first lcd screen. The first direction may be the positive z-axis direction in fig. 6 and the second direction may be the negative z-axis direction in fig. 6; when the first liquid crystal display screen 41 and the second liquid crystal display screen 42 are both rectangular, for the first concave lens 33, the first liquid crystal display screen 41 includes a first side 411 and a second side opposite to each other, the first side 411 and the second side are each composed of two longest sides and two short sides, the first side 411 is close to the first end 321 of the first concave lens 33, and the second side is close to the second end 323 of the first concave lens 33; similarly, for the second concave lens 34, the first side of the second liquid crystal display is adjacent to the first end of the second concave lens 34, and the second side of the second liquid crystal display is adjacent to the second end of the second concave lens 34.

Optionally, the central axis of the first image generating assembly 9 is perpendicular to the central axis of the second image generating assembly 10. In particular, the central axis of the first image generation assembly 9 may be perpendicular to a horizontal plane (e.g., x-axis in fig. 5), and the central axis of the second image generation assembly 10 may be parallel to the horizontal plane. Thereby can realize better bore hole 3D display effect.

Optionally, the main optical axes of the first collimating lens 21 and the first concave lens 33 of the first image generating component 9 are coincident with the center of the first liquid crystal screen 41; similarly, the main optical axes of the second collimator lens 22 and the second concave lens 34 in the second image generating assembly 10 coincide with the center of the second liquid crystal panel 42.

In some embodiments, referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of another alternative head-up display system of the present application; fig. 8 is an enlarged view of the dotted line area in fig. 7, and fig. 8 more intuitively shows the positional relationship among the first image generating assembly 9, the second image generating assembly 10, the half mirror 71, and the second mirror 72 in the embodiment shown in fig. 5. Specifically, the schematic diagram shown in fig. 7 is a side view of the HUD after being mounted to the vehicle, and assuming that the view angle shown in fig. 7 is taken as a reference, referring to fig. 8, the first end 321 in the first concave lens 33 is on the outside, and the second end 323 is on the inside, that is, the highest plane in the first concave lens 33 faces the outside (the side closer to the user), and the lowest plane in the first concave lens 33 faces the inside (the side farther from the user). The second end 323 in the second concave lens 34 is on the outside and the first end 321 is on the inside, i.e., the highest plane in the second concave lens 34 faces the inside (the side away from the user) and the lowest plane in the second concave lens 34 faces the outside (the side closer to the user). Through the position placement of each device in the embodiment shown in fig. 7 and fig. 8, the directivity of the light emitted by the first liquid crystal screen 41 after being reflected by the half mirror 71 is consistent with the directivity of the light emitted by the first backlight assembly 5 after being emitted by the liquid crystal screen 4 in the embodiment shown in fig. 3, and the directivity of the light emitted by the second liquid crystal screen 42 after being transmitted by the half mirror 71 is consistent with the directivity of the light emitted by the second backlight assembly 6 after being emitted by the liquid crystal screen 4 in the embodiment shown in fig. 4, so that the light splitting effect is better. And the first backlight assembly 5 and the second backlight assembly 6 do not need to be alternately controlled to be opened and closed, so that the calculation force requirement can be reduced, and the application is wider.

The principle of implementing 3D display by the head-up display device shown in fig. 5 is as follows:

the first image generating component 9 is configured to generate an image corresponding to a left eye, the second image generating component 10 is configured to generate an image corresponding to a right eye, and the two head-up display devices are symmetrical about the half mirror 71, and the first backlight light source 101 of the first image generating component 9 is split by the first collimating lens 21, the first micro lens array 11 and the first concave lens 33, then is incident on the surface of the first liquid crystal screen 41, and is reflected to the second mirror 72 by the half mirror 71.

The second backlight light source 102 of the second image generating assembly 10 irradiates the second liquid crystal panel 42 after being split by the second collimator lens 22, the second microlens array 12 and the second concave lens 34, and then transmits the split light to the second reflecting mirror 72 through the half mirror 71. The size of the half mirror 71 can completely cover the corresponding display area of the liquid crystal panel 4. Thus, the left eye and the right eye can respectively receive two images with parallax, and a stereoscopic effect is generated.

In the process of designing the head-up display device in the application, directional backlight can be reversely designed and optimized according to the principle of reversibility of the light path, for example, according to the angle of imaging light rays (the angle of the light rays emitted from the surface of the liquid crystal display 4), the light emitting angle of the set backlight light source 1 is calculated, the light rays can penetrate through the collimating mirror and the concave lens 3 after emitted from the specific angle, so that the light rays are collimated as much as possible, and the surface shape of the surface of the concave lens 3 is a free curved surface. In this process, the concave lens 3 is mainly required to be optimized, so that the outgoing light transmitted through the concave lens 3 is collimated; after the concave lens 3 is optimized, a light collimating device needs to be designed at a light collimating part. The light path is forward, the light source is collimated by the collimating lens 2, split by the concave lens 3 and irradiates the liquid crystal screen 4, and ideally, the light passes through the surface of the liquid crystal screen 4, and after passing through the reflecting mirror component 7 and the windshield 8, two eyes receive different image light rays at the eye box area.

The head-up display device has the advantages of small size and simple structure.

In one possible embodiment, referring to FIG. 7, the heads-up display system further includes a windshield 8; alternatively, the head-up display device may have a distribution structure as shown in fig. 5, where the first mirror 71 is a half mirror, and the first mirror 71 may reflect the light emitted by the first liquid crystal screen 41 to the second mirror 72; the light emitted from the second liquid crystal display 42 is transmitted to the second reflecting mirror 72, and then reflected by the second reflecting mirror 72 to the human eye through the windshield 8.

In the embodiments of fig. 3, 5 and 7, the light emitted from the first image generating assembly 9 is reflected by using the half mirror 71, and the light emitted from the second image generating assembly 10 is transmitted by using the half mirror 71, so that the light emitted from the first liquid crystal screen 41 is directional by the first backlight assembly 5 in the first image generating assembly 9, and finally enters the left eye of the user, the light emitted from the second liquid crystal screen 42 is directional by the second backlight assembly 6 in the second image generating assembly 10, and finally enters the right eye of the user, so that the first backlight assembly 5 and the second backlight assembly 6 can be controlled to operate simultaneously without controlling the opening and closing of the first backlight assembly 5 and the second backlight assembly 6, and the calculation force requirement is low.

Optionally, the head-up display system may also have a structure as shown in fig. 4, and accordingly, the head-up display device may include a structure as shown in fig. 3, which is described in detail above and not repeated herein.

The foregoing description of the preferred embodiments is provided for the purpose of illustration only and is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. The head-up display device is characterized by comprising a backlight light source (1), a collimating lens (2), a concave lens (3) and a liquid crystal screen (4) which are sequentially arranged from bottom to top;

light generated by the backlight light source (1) can sequentially reach the liquid crystal screen (4) 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 with the liquid crystal screen (4); the concave lens (3) is used for changing the propagation direction of the light so that the light reaches at least part of the area of the liquid crystal screen (4) according to a first preset direction.

2. Head-up display device according to claim 1, characterized in that the concave lens (3) comprises opposite flat surfaces (31) and concave surfaces (32);

-said plane (31) is close to said collimator lens (2);

the concave surface (32) comprises a first end (321), a first curve end (322), a second end (323) and a second curve end (324) which are sequentially connected;

the first end (321) has a height from the plane (31) that is greater than a height of the second end (323) from the plane (31).

3. The head-up display device according to claim 2, wherein the backlight source (1) comprises a first backlight source (101) and a second backlight source (102);

the collimating lens (2) comprises 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) that are present at a second preset distance.

4. The heads-up display device of claim 3 wherein the second predetermined distance is a distance determined along a second predetermined direction;

the second preset direction is parallel to a plane (31) where the bottom of the concave lens (3) is located.

5. The head-up display device according to claim 4, wherein the first end (321) of the first concave lens (33) is close to the first end (321) of the second concave lens (34).

6. The head-up display device according to claim 5, wherein the light rays emitted through the first concave lens (33) reach at least part of the area of the liquid crystal screen (4) according to a first sub-preset direction;

the light rays emitted by the second concave lens (34) reach at least part of the area of the liquid crystal screen (4) according to a second sub-preset direction; the first sub-preset direction and the second sub-preset direction are symmetrical along the central axis of the head-up display device.

7. A head-up display device according to claim 3, further comprising a mirror assembly (7);

the reflecting mirror assembly (7) is used for reflecting the light rays emitted by the liquid crystal display (4) so as to enable the light rays to reach the eye box area.

8. The head-up display device according to claim 7, further comprising a first microlens array (11) and a second microlens array (12);

the mirror assembly (7) comprises a half mirror (71);

the liquid crystal screen (4) comprises a first liquid crystal screen (41) and a second liquid crystal screen (42);

the first backlight light source (101), the first collimating lens (21), the first micro lens array (11), the first concave lens (33) and the first liquid crystal screen (41) which are sequentially stacked form a first image generating assembly (9);

the second backlight light source (102), the second collimating lens (22), the first micro-lens array (12), the second concave lens (34) and the second liquid crystal screen (42) which are sequentially stacked form a second image generating assembly (10);

the first image generation assembly (9) is positioned on a first side of the half mirror (71);

-said second image generation assembly (10) is located on a second side of said half mirror (71) opposite to said first side;

a first preset included angle exists between the central axis of the first image generation assembly (9) and the normal line of the half-mirror (71);

a second preset included angle exists between the central axis of the second image generation assembly (10) and the normal line of the half-mirror (71);

the difference value between the first preset included angle and the second preset included angle is smaller than or equal to a preset angle threshold value.

9. The head-up display device according to claim 8, wherein the first liquid crystal screen (41) has a third predetermined angle with the plane (31) of the first concave lens (33);

and a fourth preset included angle exists between the second liquid crystal screen (42) and the plane (31) of the second concave lens (34).

10. The head-up display device according to claim 8, wherein the second end and the first end of the first concave lens (33) are disposed in the first direction in order;

the second end and the first end of the second concave lens (34) are sequentially arranged along a second direction; the second direction is the opposite direction of the first direction.

11. Head-up display device according to claim 10, characterized in that the central axis of the first image generation assembly (9) is perpendicular to the central axis of the second image generation assembly (10).

12. A head-up display system, characterized by comprising a head-up display device according to any of claims 1-11 and a windscreen (8);

the heads-up display system is configured to: light emitted by the liquid crystal screen (4) sequentially passes through the reflecting mirror assembly (7) and the windshield (8) to reach the eye box area.