Head-up display device and vehicle

Abstract

The embodiment of the application provides a head-up display device and a vehicle; the head-up display device comprises a light machine module, a light splitting and combining module, a mirror set and a windshield; the light machine module comprises an image generation unit and a light diffuser, the light diffuser is used for partition modulation of projection light rays emitted by different display regions of the image generation unit, so that the first region light rays and the second region light rays form opposite deflection directions and the diffusion angle is controlled to not exceed a preset angle; the light splitting and combining module comprises a light splitter and a mirror, the light splitter and the mirror are arranged to be inclined to the normal direction of the light emission plane of the light diffuser, and the mirror is deflected relative to the inclination direction of the light splitter, so that an included angle of at least 15° is formed between the light splitter and the mirror; the mirror set is used for receiving and amplifying the projection light rays processed by the light splitting and combining module; and the windshield is used for reflecting the amplified projection light rays to the user's field of view to form a long-distance virtual image and a short-distance virtual image with different depths of field.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of optical display, and more particularly, to a head-up display device and a vehicle. BACKGROUND

[0002] As an optical display technology that projects key information in the form of virtual image into the user's field of view, the head-up display system (HUD) has been widely used in the fields of automobiles, aviation, etc.

[0003] The traditional HUD system is usually designed as a single focal plane, i.e., the distance between the virtual image and the user is fixed, such as 2.5m W-HUD or more than 10m AR-HUD. However, with the increasing demand for display content and visual interaction, the single focal plane design has been difficult to meet the information display requirements in complex scenarios.

[0004] The dual focal plane head-up display system has emerged, which can generate two images with different distances, and display them at different distances according to the display content, thereby increasing the depth interaction of the content. However, the existing dual focal plane head-up display system has some overlap in the spatial architecture of the two sets of optical systems for the far view and the near view, which is easy to form light signal crosstalk, i.e., the images of the far view and the near view are captured by the two sets of optical systems at the same time, forming multiple virtual images, causing the user's visual discomfort. Therefore, how to effectively eliminate signal crosstalk has become a key challenge in the design of the dual focal plane head-up display system. SUMMARY

[0005] The purpose of the present application is to provide a new technical solution for a head-up display device and a vehicle.

[0006] In a first aspect, the present application provides a head-up display device, comprising:

[0007] An optical-mechanical module, comprising an image generation unit and a light diffuser, the light diffuser being arranged on the light exit side of the image generation unit, for partitioning and modulating the projection light rays emitted by different display regions of the image generation unit, including controlling the diffusion angle and deflection direction of the light rays of each display region, so that the first region light rays and the second region light rays form opposite deflection directions and the diffusion angle is controlled to be less than or equal to a preset angle;

[0008] A light splitting and combining module, comprising a light splitter and a reflector, the light splitter and the reflector being arranged obliquely with respect to the normal direction of the light exit plane of the light diffuser, and the reflector being deflected with respect to the oblique direction of the light splitter, so that an included angle of at least 15° is formed between the light splitter and the reflector, for guiding the first region light rays and the second region light rays as far view light path and near view light path, respectively;

[0009] a mirror group configured to receive and amplify the projection light rays processed by the light splitting and combining module; and

[0010] a windshield configured to reflect the amplified projection light rays to a user's field of view to form a far-virtual image and a near-virtual image with different depths of field.

[0011] Optionally, the light diffuser is configured to deflect the first area light rays to project towards the light splitter and deflect the second area light rays to project towards the mirror, while the diffusion angles of the first area light rays and the second area light rays are both controlled to be ≤10°.

[0012] Optionally, the light splitter is a half-transmission half-reflection mirror or a polarization light splitter.

[0013] Optionally, the mirror is a full-reflection mirror.

[0014] Optionally, the light splitting and combining module further comprises an angle suppression device, which is arranged on the light path between the light splitter and the mirror, and is configured to block the projection light rays with an incident angle greater than 40°.

[0015] Optionally, the angle suppression device is perpendicular to the light exit plane of the light diffuser.

[0016] Optionally, the angle suppression device is a privacy film or a diffraction grating, which comprises an optical microstructure layer containing periodically arranged microstructure units.

[0017] The angle suppression device is configured to:

[0018] allow the light rays with an incident angle of 0° to 40° to be transmitted;

[0019] and simultaneously absorb or reflect the light rays with an incident angle greater than 40° to block the transmission of crosstalk light rays between the far-vision light path and the near-vision light path.

[0020] Optionally, the included angle between the light splitter and the mirror ranges from 15° to 40°.

[0021] Optionally, the mirror group comprises a first mirror and a second mirror, and both the first mirror and the second mirror are curved mirrors.

[0022] The image generation unit is a DLP PGU, an LCOS PGU, or a TFT PGU.

[0023] In a second aspect, the present application provides a vehicle, which comprises:

[0024] The head-up display device as described in the first aspect.

[0025] The beneficial effects of the present application are as follows:

[0026] The head-up display device provided by the embodiments of the present application partitions and modulates the projected light rays of different display regions of the image generation unit by the light diffuser, so that the first region light rays and the second region light rays form opposite deflection directions (for example, one deflects to the right and the other deflects to the left) and the diffusion angles are controlled, in combination with the design of the at least 15° inclined angle between the beam splitter and the reflector in the light splitting and combining module, the effective physical separation of the far view light path and the near view light path is effectively realized. This optical architecture significantly reduces the light signal crosstalk problem caused by the mutual intrusion of the far view light rays and the near view light rays in the dual focal plane head-up display system, avoids the virtual image overlapping interference, and at the same time, through the cooperation of the reflector group and the windshield, finally clearly presents the far view virtual image and the near view virtual image with different depths in the user's field of view, greatly improves the interactive experience and imaging quality of the display system. In short, the head-up display device provided by the present application solves the light signal crosstalk problem in the dual focal plane head-up display system through a new optical design, and improves the user's visual experience.

[0027] Other features of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present specification and, together with the description, serve to explain the principles of the present specification.

[0029] Figure 1 It is a structural schematic diagram of a traditional coaxial dual focal plane head-up display system;

[0030] Figure 2 It is a light path schematic diagram of a traditional coaxial dual focal plane head-up display system;

[0031] Figure 3 It is a structural and light path schematic diagram of the head-up display device provided by the embodiments of the present application;

[0032] Figure 4 It is a structural and light path schematic diagram of the head-up display device provided by the embodiments of the present application;

[0033] Figure 5 It is a schematic diagram of the light diffuser provided by the embodiments of the present application;

[0034] Figure 6 It is an ideal light diffusion intensity distribution diagram after the light diffuser.

[0035] Explanation of reference signs:

[0036] 100, optical mechanical module; 101, image generation unit; 102, light diffuser;

[0037] 200, mirror group; 201, first mirror; 202, second mirror;

[0038] 301, windshield;

[0039] 401, human eye;

[0040] 501a, far-vision virtual image; 501b, near-vision virtual image; 501c, abnormal far-vision virtual image;

[0041] 601a, first area light; 601b, second area light; 601c, first crosstalk light; 601d, second crosstalk light;

[0042] 611, initial light; 621, deflected light; 622, scattered light a; 623, scattered light b;

[0043] 700, light splitting and combining module; 701, light splitter; 702, mirror; 703, angle restraining device. DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in the embodiments, as well as the numerical expressions and numerical values, are not limiting to the scope of the present application unless specifically stated otherwise.

[0045] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application, its application, or uses.

[0046] Techniques and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification where appropriate.

[0047] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0048] It should be noted that like numbers and letters refer to like items throughout the drawings, and that once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0049] A head-up display device and a vehicle are described in detail below with reference to the accompanying drawings.

[0050] According to one embodiment of the present application, a head-up display device is provided, referring to Figure 3As shown, the head-up display device includes: an optical engine module 100, a light splitting and combining module 700, a reflector group 200, and a windshield 301. The optical engine module 100 includes an image generation unit 101 and a light diffuser 102. The light diffuser 102 is disposed on the light-emitting side of the image generation unit 101 and is used to perform zone modulation of the projection light emitted from different display areas of the image generation unit 101. This includes controlling the diffusion angle and deflection direction of the light in each display area, so that the light in the first area 601a and the light in the second area 601b form opposite deflection directions and controlling the diffusion angle to be less than or equal to a preset angle. The beam splitter and combiner module 700 includes a beam splitter 701 and a reflector 702. The beam splitter 701 and the reflector 702 are inclined relative to the normal direction of the light-emitting plane of the light diffuser 102, and the reflector 702 is deflected relative to the inclined direction of the beam splitter 701, so that the beam splitter 701 and the reflector 702 form an angle of at least 15°, which is used to guide the light rays 601a from the first region and 601b from the second region into a distant light path and a near light path, respectively. The reflector group 200 is used to receive and amplify the projected light rays processed by the beam splitter and combiner module 700. The windshield 301 is used to reflect the amplified projected light rays into the user's field of vision, forming a distant virtual image 501a and a near virtual image 501b with different depths of field.

[0051] The head-up display (HUD) provided in this application embodiment specifically solves the core problems of virtual image overlap interference, decreased image clarity and user visual fatigue caused by far and near light crosstalk in traditional dual-focal HUD systems. Through the coordinated light angle control technology of the light splitting and combining module 700 and the light diffuser 102, the effective separation of the far-field light path and the near-field light path is achieved.

[0052] Specifically, the head-up display device provided in this application embodiment includes a beam splitter 701-reflector 702 optical architecture design with an angle of at least 15°, which, together with a light diffuser 102 (diffuser device) modulated by a partition angle, enables the first region light 601a ( Figure 3 The light rays from the right side of the middle region and the light rays from the second region 601b ( Figure 3 The light rays in the left-center region are deflected in the opposite direction and the diffusion angle is controlled within a preset angle (such as within 10°), which effectively blocks the abnormal light path, i.e. the crosstalk light transmission path. While ensuring the difference in depth of field displayed by the dual focal planes, it completely eliminates the ghosting phenomenon caused by light signal crosstalk, and significantly improves the reliability of multi-level information interaction.

[0053] The main components of the head-up display device provided in the embodiments of this application are described below.

[0054] The head-up display device provided by the embodiments of the present application realizes stable projection of a double-focal-plane virtual image through the cooperative design of multiple modules, can form a long-distance virtual image 501a and a short-distance virtual image 501b with different depths of field in the field of view (human eye 401) of a user, and the long-distance virtual image 501a and the short-distance virtual image 501b formed are both clear and have no interference.

[0055] In the head-up display device provided by the embodiments of the present application, the optical-mechanical module 100 serves as a core optical engine, which adopts a cooperative architecture of the image generation unit 101 and the light diffuser 102 (Diffuser device), as shown in Figure 3 . The image generation unit 101 is responsible for projecting projection light rays that fuse long-distance and short-distance information, and the light diffuser 102 implements partitioned spatial modulation on the projection light rays projected by the image generation unit 101 on the light exit side. The light diffuser 102, for example, through a built-in specific microstructure unit array, respectively performs differential light ray control on the first area light ray 601a and the second area light ray 601b projected by the image generation unit 101: on the one hand, the two area light rays can form reverse deflection transmission paths, and on the other hand, the diffusion angles of the respective light rays are constrained within a preset angle (for example, ≤10°). This optical isolation mechanism constructed from the light source end eliminates the possibility of long-distance and short-distance light rays crossing and invading, thereby blocking the basis of the optical path of signal crosstalk.

[0056] The head-up display device provided by the embodiments of the present application includes a light splitting and combining module 700, as shown in Figure 3 . The light splitting and combining module 700 includes a light splitter 701 and a reflector 702. In the head-up display device provided by the embodiments of the present application, the light splitting and combining module 700 innovatively adopts a special inclined architecture design, as shown in Figure 3 . The core components of the light splitting and combining module 700, the light splitter 701 and the reflector 702, are arranged at a non-parallel angle ≥15°, breaking through the structural limitation of the coaxial parallel optical path of the traditional double-focal-plane head-up display system, as shown in Figure 1 and Figure 2 . This angle differentiation design in the present application realizes physical isolation of the long-distance optical path and the short-distance optical path through geometric optics.

[0057] It should be noted that, in the present application, the reflector 702 and the light splitter 701 are not arranged in parallel, but the reflector 702 has a certain deflection relative to the light splitter 701, and the two are not in the same direction, and form an angle of at least 15° between them.

[0058] Specifically, among the projection light rays modulated by the light diffuser 102, the first area light rays 601a (i.e. long-distance light rays) are directed to the mirror 702, are reflected by the mirror 702, and are transmitted along a long-distance light path to finally form a long-distance virtual image 501a in the user's field of view. The second area light rays 601b, on the other hand, pass through the beam splitter 701, are transmitted along a short-distance light path to form a short-distance virtual image 501b. Due to the existence of an angle ≥ 15° between the two mirrors (the beam splitter 701 and the mirror 702), the transmission directions of the long-distance light rays and the short-distance light rays are deflected in different directions, i.e. in opposite directions, and the spatial separation angle can be ≥ 10°. Please continue to see Figure 3 This geometric light path isolation mechanism fundamentally blocks the cross-invasion of abnormal light paths, effectively eliminating the signal crosstalk problem in the dual-focus display.

[0059] In a traditional coaxial dual-focus head-up display system, referring to the optical structure shown in Figure 1 , the long-distance and short-distance optical systems have a high degree of spatial overlap, making it difficult to solve the signal crosstalk problem through physical shielding. Specifically, referring to Figure 2 : when the left half of the light machine module 100 projects short-distance light rays, the second area light rays 601b are reflected by the mirror group 200 and the windshield 301, and should form a short-distance virtual image 501b at the terminal. However, due to the coaxial design of the long-distance and short-distance optical systems, and the parallel arrangement of the mirror 702 and the beam splitter 701, part of the second area light rays 601b will form first crosstalk light rays 601c, and will form an abnormal long-distance virtual image 501c through the same abnormal reflection path of the mirror group 200, i.e. the "short-distance long-distance" crosstalk phenomenon. Similarly, there is also a "long-distance short-distance" crosstalk in the long-distance display area. This cross-invasion of optical paths causes ghosting and blurring of the terminal virtual image, which interferes with the driver's visual judgment.

[0060] The present application aims to propose an optical architecture for a dual-focus head-up display device without signal crosstalk, referring to Figure 3 , the angle between the beam splitter 701 and the mirror 702 is changed from the traditional parallel arrangement to an inclined arrangement with an angle ≥ 15° between the two, so that the transmission directions of the long-distance and short-distance light rays are deflected in opposite directions (the spatial separation angle can be ≥ 10°). This design makes the incident angle of abnormal light paths such as the first crosstalk light rays 601c exceed the effective receiving range of the mirror 702, fundamentally blocking the establishment of crosstalk light paths. Furthermore, the integration of the light diffuser 102 in the light machine module 100 enables differential modulation of the emitted first area light rays 601a and second area light rays 601b - making the two area light rays form opposite deflections and the diffusion angle be controlled within a certain range (e.g. within 10°), referring to Figure 5as shown.

[0061] The head-up display device provided by the embodiment of the present application comprises a mirror group 200, as shown in the figure. Figure 3 As shown, the mirror group 200 receives two light rays (near-view light rays and far-view light rays) output by the light splitting and combining module 700 and performs amplification processing, so as to ensure that the size of the virtual image formed meets the vehicle display requirement. The virtual image formed comprises a near-view virtual image 501b and a far-view virtual image 501a.

[0062] The head-up display device provided by the embodiment of the present application further comprises a windshield 301 of a vehicle. The windshield 301 serves as a final reflection surface to project the amplified light rays to the human eye 401, so as to synchronously present the far-view virtual image 501a and the near-view virtual image 501b in the user's field of view, thereby realizing a double-focal-plane display effect.

[0063] The head-up display device provided by the embodiment of the present application solves the ghosting problem of the virtual image caused by the mutual invasion of the near-view light rays and the far-view light rays in the traditional double-focal-plane HUD through the angle modulation of the light diffuser 102 and the angle separation of the light splitting and combining module 700.

[0064] The head-up display device provided by the embodiment of the present application performs partition modulation on the projection light rays of different display regions of the image generation unit 101 by the light diffuser 102, so that the first region light rays 601a and the second region light rays 601b form opposite deflection directions (for example, one deflects to the right and the other deflects to the left) and the diffusion angles are controlled. In combination with the design of the inclined angle of at least 15° between the light splitter 701 and the mirror 702 in the light splitting and combining module 700, the effective physical separation of the far-view light path and the near-view light path is effectively realized. This optical architecture significantly reduces the light signal crosstalk problem caused by the mutual invasion of the near-view light rays and the far-view light rays in the double-focal-plane head-up display system, avoids the overlapping interference of the virtual image, and at the same time, through the cooperation of the mirror group 200 and the windshield 301, the far-view virtual image 501a and the near-view virtual image 501b with different depths of field are finally clearly presented in the user's field of view, which greatly improves the interactive experience and imaging quality of the display system.

[0065] In short, the head-up display device provided by the present application solves the light signal crosstalk problem in the double-focal-plane head-up display system through a new optical design, thereby improving the user's visual experience.

[0066] In some examples provided by the present application, the light diffuser 102 is configured to: deflect the first region light rays 601a so as to be projected to the light splitter 701, deflect the second region light rays 601b so as to be projected to the mirror 702, and control the diffusion angles of the first region light rays 601a and the second region light rays 601b to be ≤10°.

[0067] In the example provided in the present application, the light diffuser 102 is designed with, for example, an array of microstructure units.

[0068] In specific applications, the array of microstructure units can be customized according to specific requirements for the direction of light deflection and the size of the diffusion angle. It should be noted that the present application does not make detailed constraints and limitations on the specific design of the array of microstructure units on the light diffuser 102, which belongs to the professional field of microstructure design.

[0069] In the present application, the function of the light diffuser 102 is described as follows:

[0070] (1) Light deflection direction control: through the specific microstructure design of different regions on the light diffuser 102, the first region light 601a (i.e. long-distance light) and the second region light 601b (i.e. close-range light) projected by the image generation unit 101 can form reverse deflection (different deflection directions). Specifically, see Figure 3 : the first region light 601a is deflected to the right and projected to the mirror 702, and the second region light 601b is deflected to the left and projected to the beam splitter 701.

[0071] (2) Diffusion angle constraint: the diffusion angles of the first region light 601a (long-distance light) and the second region light 601b (close-range light) are both controlled within the range of ≤10°, ensuring that the light energy is concentrated in the normal transmission path.

[0072] Referring to Figure 5 , the light diffuser 102 is a light distribution modulation device. The initial light 611 (i.e. projection light) output by the image generation unit 101 realizes the deflection and diffusion of the light angle through the array of microstructure units of the light diffuser 102: (1) forming deflected light 621; (2) forming scattered light a 622 and scattered light b 623; wherein the angle formed by scattered light a 622 and scattered light b 623 is the diffusion range.

[0073] The arrangement and shape of the microstructure units of the light diffuser 102 can control the diffusion angle and deflection angle of the light. By the light diffuser 102, the included angle between the scattered light a 622 and the scattered light b 623 is controlled within a certain angle range, which can be determined according to the head-up display device. For a double-focal-plane head-up display device, the longitudinal FOV is usually not greater than 5°, so the diffusion angle can be controlled within 10°, so that most of the light can be imaged in the normal path, and almost no light with a large angle forms crosstalk. At the same time, through the angle deflection of the light diffuser 102, the reverse transmission effect of the first region light 601a and the second region light 601b in Figure 3 can be realized.

[0074] The ideal light diffusion intensity distribution is shown in Figure 6 As shown, the uniform intensity distribution is concentrated within a certain angle range, and the energy of the light beyond the specified angle range decays sharply, forming a standard rectangular flat square wave. However, the light energy distribution of the actual light diffuser 102 decays with a certain slope. In order to ensure the intensity requirement within the effective angle range, the light beyond the specified angle range still has light overflow, and therefore the crosstalk can be improved by adjusting the angle position of the internal beam splitter 701 and the mirror 702 of the light splitting and combining module 700 and the angle control of the light diffuser 102.

[0075] The light diffuser 102 introduced in the present application can realize suppression of mutual crosstalk of far scene light and near scene light. The reverse deflection design makes the incident angle of the abnormal light path such as the first crosstalk light 601c in the near scene light deviate from the effective range of the mirror 702, so that the crosstalk influence can be reduced. The 10° diffusion angle limit ensures that the light energy is concentrated in the main light path, avoiding the blurring of the virtual image due to excessive diffusion.

[0076] In some examples provided in the present application, referring to Figure 3 and Figure 4 The beam splitter 701 is a half-transmission half-reflection mirror or a polarization beam splitter.

[0077] In the head-up display device of the present application, the beam splitter 701 can have the following two forms:

[0078] Half-transmission half-reflection mirror scheme: the surface of the mirror can have both transmission and reflection characteristics through coating process. For example, the typical transmission and reflection ratio is 50:50 (this ratio can be adjusted). The light machine module 100 projects the projection light: the left half area light, i.e. the second area light 601b, is transmitted through the half-transmission half-reflection mirror and enters the mirror group 200 to form the near scene virtual image 501b; the right half area light, i.e. the first area light 601a, is reflected by the full reflection mirror 702 and then reflected by the half-transmission half-reflection mirror to enter the mirror group 200 to form the far scene virtual image 501a.

[0079] Polarization beam splitter scheme: the polarization light characteristics are used to allow only light with a specific polarization direction to be transmitted (such as P polarization), and the rest of the light is reflected (such as S polarization). This scheme can be used with a polarization light machine to realize more efficient light path separation.

[0080] In some examples provided in the present application, referring to Figure 3 and Figure 4 The mirror 702 is a full reflection mirror.

[0081] Referring to Figure 3, the right half area light of the light machine module 100, that is, the first area light 601a, is first reflected to the beam splitter 701 through the reflector 702 (total reflector) and then reflected into the reflector group 200. This design makes the far view light (the first area light 601a) and the near view light (the second area light 601b) form an included angle of more than 15°, and the crosstalk is reduced through optical path separation.

[0082] The reflectivity of the total reflector is high, which ensures that the brightness uniformity of the far view virtual image 501a is better. In combination with the 15° included angle design formed with the beam splitter 701, the incidence angle of abnormal light paths such as the first crosstalk light 601c in the near view light deviates from the effective range, so that the crosstalk suppression rate is improved.

[0083] In the present application, the layout angle of the reflector 702 can be adjusted to form an included angle of at least 15° with the beam splitter 701.

[0084] In the present application, the beam splitter 701 realizes initial separation of the light path through transmission / reflection or polarization selection, which is the basis for generating a double focal plane. The reflector 702 ensures complete transmission of the far view light path through total reflection characteristics, cooperates with the beam splitter 701 to form an optical path included angle of more than 15°, and constitutes a first-order crosstalk suppression architecture. The reflector 702 and the beam splitter 701 together with the reflector group 200 and the windshield 301 form a coaxial double focal plane optical system to realize non-crosstalk display of far and near view virtual images.

[0085] In some examples provided in the present application, referring to Figure 4 The angle suppression device 703 is arranged on the light path between the beam splitter 701 and the reflector 702, and is used to block the projection light with an incidence angle greater than 40°.

[0086] The angle suppression device 703 is arranged in the beam splitting and light combining module 700, and is specifically arranged on the light path between the beam splitter 701 and the reflector 702, referring to Figure 4 The main function of the angle suppression device 703 is to selectively block the projection light with an incidence angle greater than 40°, which is used to solve the crosstalk problem caused by the high overlap of the optical path in the coaxial double focal plane head-up display device / system. The specific optical path control logic is as follows.

[0087] Normal light path (no crosstalk):

[0088] Near view light path: the second area light 601b is projected from the optical engine module 100, transmitted through the light splitter 701, reflected by the mirror group 200, reflected by the windshield 301, and forms the near view virtual image 501b. This path does not pass through the angle suppression device 703 and is not blocked.

[0089] Far view light path: the first area light 601a is projected from the optical engine module 100, reflected by the mirror 702, reflected by the angle suppression device 703 (incident angle 0°-30°), reflected by the light splitter 701, reflected by the mirror group 200, reflected by the windshield 301, and forms the far view virtual image 501a. Because the incident angle is ≤40°, it passes normally.

[0090] Crosstalk light path, which is suppressed in this application, see Figure 5 :

[0091] Light path of the first crosstalk light 601c in the near view light: the first crosstalk light 601c may be reflected by the mirror 702 at a large angle (>40°) and incident on the angle suppression device 703, which is blocked and absorbed by the internal microstructure of the angle suppression device 703 due to the high system coincidence.

[0092] Light path of the second crosstalk light 601d in the far view light: the second crosstalk light 601d may be incident on the angle suppression device 703 at a large angle (>40°) due to scattering and other reasons, and is also blocked and absorbed.

[0093] By introducing the angle suppression device 703 in the light splitting and combining module 700, the crosstalk light is further reduced, and the separation degree of the near view and the far view is significantly enhanced.

[0094] In some examples provided in this application, see Figure 4 , the angle suppression device 703 is perpendicular to the light exit plane of the light diffuser 102.

[0095] The angle suppression device 703 (such as a privacy film or a diffraction grating) can be in a perpendicular relationship with the light diffuser 102 (Diffuser device).

[0096] The function of the light diffuser 102: the projected light from the image generating unit 101 is angularly diffused and deflected, so that the near view light and the far view light are output in opposite directions, and the crosstalk is preliminarily reduced.

[0097] Synergistic effect of vertical layout: after the angle suppression device 703 and the light diffuser 102 are placed vertically, the crosstalk light (such as the first crosstalk light 601c and the second crosstalk light 601d) is intercepted twice when passing through the light diffuser 102 and the angle suppression device 703 at a large angle (>40°).

[0098] Of course, the angle suppression device 703 (such as a privacy film or a diffraction grating) and the light diffuser 102 (Diffuser device) can also be approximately perpendicular, such as forming an included angle of 85°-90°, the core of which is to achieve double crosstalk suppression through spatial angle separation.

[0099] In some examples provided in the present application, the angle suppression device 703 is a privacy film or a diffraction grating, which includes an optical microstructure layer containing periodically arranged microstructure units; the angle suppression device 703 is configured to allow light rays with an incident angle of 0°-40° to be transmitted, while being able to absorb or reflect light rays with an incident angle greater than 40°, so as to block the transmission of crosstalk light between the far view light path and the near view light path.

[0100] The privacy film, for example, adopts a multi-layer transparent medium film stack, and a nanoscale grating structure can be formed between the film layers to control the transmission angle through interference effect.

[0101] The diffraction grating realizes angle selectivity by using the principle of diffraction.

[0102] When the light rays are incident at an angle of 0°-40°, the angle suppression device 703 can make the incident light rays be transmitted along the original direction. For crosstalk light rays, such as the first crosstalk light ray 601c in the near view light and / or the second crosstalk light ray 601d in the far view light, when they are incident at an angle greater than 40°, the angle suppression device 703 can block and absorb them.

[0103] In some examples provided in the present application, the included angle between the beamsplitter 701 and the mirror 702 ranges from 15° to 40°.

[0104] In the existing dual-focus head-up display system, the far view and the near view optical systems are highly overlapped, which is easy to form mutual crosstalk between signals, that is, the far view light rays invade the near view optical system or the near view light rays invade the far view optical system, resulting in that the user observes that the virtual image far view and the near view interfere with each other. In the coaxial dual-focus head-up display system, this problem is particularly prominent, because physical shielding through a structural member cannot achieve effective isolation.

[0105] In the existing optical architecture, referring to Figure 1 and Figure 2 , the mirror 702 and the beamsplitter 701 are placed in a near-parallel manner, resulting in that the light rays emitted from different regions of the picture, such as the first region light ray 601a and the second region light ray 601b, are approximately parallel, with a small angle difference, for example, only about 5°. This small angle difference makes crosstalk light rays such as the first crosstalk light ray 601c easily pass through the mirror 702 and the beamsplitter 701 to enter the eye 401, forming interference.

[0106] 15° as the lower limit to ensure the basic crosstalk suppression effect; 40° as the upper limit to balance the system size and cost control (too large angle may increase the system size and production cost).

[0107] Optionally, the included angle between the beamsplitter 701 and the mirror 702 can be 15°, 20°, 25°, 30°, 35°, or 40°.

[0108] It should be noted that the included angle between the beamsplitter 701 and the mirror 702 is generally not more than 35°, and the maximum is not more than 40°, otherwise it will lead to a larger system size.

[0109] In some examples provided by the present application, the mirror group 200 includes a first mirror 201 and a second mirror 202, and the first mirror 201 and the second mirror 202 are both curved mirrors.

[0110] The first mirror 201 is close to the image generation unit 101 (PGU) and is responsible for preliminary reflection and adjusting the light propagation direction.

[0111] The second mirror 202 is close to the windshield 301 and is responsible for secondary reflection, and its curvature needs to match the curvature of the windshield 301 to reduce distortion.

[0112] In some examples provided by the present application, the image generation unit 101 is a DLP PGU, an LCOS PGU, or a TFT PGU.

[0113] According to another embodiment of the present application, a vehicle is provided, which includes the head-up display device as described above.

[0114] The specific implementation of the vehicle of the embodiments of the present application can refer to the above-mentioned embodiments of the head-up display device, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0115] The above embodiments mainly describe the differences between the various embodiments, and the different optimization features between the various embodiments can be combined to form a more optimal embodiment as long as they are not contradictory. Considering the brevity of the writing, it will not be repeated here.

[0116] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A head-up display device, characterized in that, include: The optical engine module (100) includes an image generation unit (101) and a light diffuser (102). The light diffuser (102) is disposed on the light-emitting side of the image generation unit (101) and is used to perform partitioned modulation of the projection light emitted from different display areas of the image generation unit (101). This includes controlling the diffusion angle and deflection direction of the light in each display area, so that the light in the first area (601a) and the light in the second area (601b) form opposite deflection directions and controlling the diffusion angle to be less than or equal to a preset angle. The beam splitter and beam combiner module (700) includes a beam splitter (701) and a reflector (702). The beam splitter (701) and the reflector (702) are inclined relative to the normal direction of the light output plane of the light diffuser (102), and the reflector (702) is deflected relative to the inclined direction of the beam splitter (701), so that the beam splitter (701) and the reflector (702) form an angle of at least 15°, which is used to guide the light rays of the first region (601a) and the light rays of the second region (601b) into a far-field light path and a near-field light path, respectively. A reflector assembly (200) is used to receive and amplify the projected light rays processed by the beam splitting and combining module (700); and, The windshield (301) is used to reflect the magnified projected light into the user's field of vision to form a distant virtual image (501a) and a near virtual image (501b) with different depths of field. The beam splitting and combining module (700) also includes an angle suppression device (703), which is disposed in the optical path between the beam splitter (701) and the reflector (702) to block projection light rays with an incident angle greater than 40°.

2. The head-up display device according to claim 1, characterized in that, The light diffuser (102) is configured to deflect the light rays (601a) from the first region so that they can be projected onto the beam splitter (701), and to deflect the light rays (601b) from the second region so that they can be projected onto the reflector (702), while controlling the diffusion angles of the light rays (601a) from the first region and the second region to be ≤10°.

3. The head-up display device according to claim 1, characterized in that, The beam splitter (701) is a semi-transparent and semi-reflective mirror or a polarizing beam splitter.

4. The head-up display device according to claim 1, characterized in that, The reflector (702) is a total reflection mirror.

5. The head-up display device according to claim 1, characterized in that, The angle suppression device (703) is perpendicular to the light-emitting plane of the light diffuser (102).

6. The head-up display device according to claim 1, characterized in that, The angle suppression device (703) is a privacy film or a diffraction grating; The angle suppression device (703) is configured to allow light with an incident angle of 0° to 40° to pass through, while absorbing or reflecting light with an incident angle greater than 40° to block crosstalk light transmission between the far-field optical path and the near-field optical path.

7. The head-up display device according to claim 1, characterized in that, The angle between the beam splitter (701) and the reflector (702) ranges from 15° to 40°.

8. The head-up display device according to claim 1, characterized in that, The mirror assembly (200) includes a first mirror (201) and a second mirror (202), both of which are curved mirrors; The image generation unit (101) is a DLP PGU, LCOS PGU, or TFT PGU.

9. A vehicle, characterized in that, include: The head-up display device as described in any one of claims 1-8.

Images