Dual-focal-surface vehicle-mounted head-up display system and vehicle

Abstract

The application discloses a kind of bifocal vehicle-mounted head-up display systems and vehicle, the system includes: first waveguide display module, for emitting light;Near focal plane transmits module, it is set to one side of the first waveguide display module, for forming near focal plane image light;And / or far focal plane transmits module, it is set to one side of the first light waveguide display module and with the near focal plane transmits module same side or opposite side, for forming far focal plane image light.The application is by being set near focal plane transmits module and far focal plane transmits module in one side of first light waveguide display module, angle selection using the far focal plane transmits module and near focal plane transmits module to control different angle light into different light path, to form far focal plane image and near focal plane image respectively, to reach the effect of realizing double focal plane display while not obvious increase system volume.

Description

Technical Field

[0001] This invention relates to the field of vehicle head-up display technology, and particularly to a dual-focal-plane vehicle head-up display system and vehicle. Background Technology

[0002] In recent years, with the accelerated development of automotive intelligence, smart cockpits have become a focal point of competition for more and more automakers. Head-up display systems (HUDs), as an indispensable component, are showing a clear trend of installation in vehicles. HUDs can present information directly and accurately within the horizontal field of vision, allowing drivers to obtain all important information such as speed, warning signals, and navigation arrows without having to look down at the instrument cluster or auxiliary displays.

[0003] For basic vehicle information (such as speed, mileage, fuel level, etc.), the image is usually projected at a distance of about 2 to 3 meters to avoid interfering with road conditions; while for information that enables augmented reality (AR) interaction, such as navigation and warnings, the image is generally projected at a distance of more than 10 meters to better blend with the external road surface. Therefore, the projected image needs to be projected onto two different focal planes.

[0004] For traditional head-up display (HUD) solutions, achieving dual-focal-plane imaging typically requires two physical Picture Generation Units (PGUs) and two sets of reflective optical systems to achieve two different projection distances. This undoubtedly increases costs, reduces system reliability, and increases system size. For example, in the first prior art solution (patent CN209946527U), the same set of turning mirrors is used, employing two image sources placed at different positions on the projection optical path to project images at different distances. Another example is the second prior art solution (patent CN112789545A), which uses a single image source and utilizes the placement of a reflector to segment the image, forming two optical paths that project the image onto different surfaces. However, both of these solutions have certain drawbacks. For instance, using two image sources in the first solution not only increases system size but also significantly raises costs. Similarly, while sharing a single image source in the second solution can save costs, the two images with different focal lengths follow different optical paths, occupying different spaces, and the increased optical path of the other image significantly increases the overall size compared to a single image. Summary of the Invention

[0005] This invention provides a dual-focal-area vehicle head-up display system and vehicle, aiming to achieve dual-focal-area display without significantly increasing the system size.

[0006] This invention provides a dual-focal-plane vehicle head-up display system, comprising:

[0007] The first waveguide display module is used for outputting light rays;

[0008] A near-focal plane transmission module is disposed on one side of the first waveguide display module and is used to form near-focal plane image light rays;

[0009] And / or a far-focus transmission module, disposed on one side of the first optical waveguide display module and on the same side or opposite side of the near-focus transmission module, for forming far-focus image light rays.

[0010] Furthermore, the first waveguide display module emits light rays with first polarization states at different angles;

[0011] The near-focal surface transmission module is a near-focal surface transmission film, which is disposed below the first waveguide display module. It is used to selectively transmit light of the first polarization state and to fully transmit light of the second polarization state to form near-focal surface image light. The second polarization state light is obtained by a light conversion module disposed below the near-focal surface transmission module, and the photoelectric field direction of the first polarization state light is perpendicular to the photoelectric field direction of the first polarization state light.

[0012] The far-focus transmission module is a far-focus transmission film. The far-focus transmission film is disposed above the first waveguide display module and is used to selectively transmit light of the first polarization state and to fully transmit light of the first polarization state, so as to form far-focus image light.

[0013] Furthermore, the angular transmittance and reflectance spectra of the near-focal surface transmittance film and the far-focal surface transmittance film have complementary characteristics, which are either completely complementary or partially complementary.

[0014] Furthermore, the light conversion module includes a quarter-wave plate disposed below the near-focal surface transmission module and a total internal reflection lens disposed below the quarter-wave plate.

[0015] Furthermore, the near-focal surface transmission module is a lens element with adjustable focal length, and the lens element is disposed above the first waveguide display module.

[0016] Furthermore, the telephoto lens transmission module is a second optical waveguide display module, which is positioned above the lens element.

[0017] Furthermore, the near-focal plane transmission module is a direct display screen, which is located below the first waveguide display module.

[0018] Furthermore, the near-focal surface transmission module is a HUD projection module, which is positioned below the first waveguide display module.

[0019] Furthermore, the HUD projection module includes a third optical waveguide display module and a reflection unit, wherein the reflection unit is disposed between the first optical waveguide display module and the third optical waveguide display module.

[0020] This invention also provides a vehicle that employs the dual-focal-surface vehicle head-up display system as described in any of the preceding embodiments.

[0021] This invention provides a dual-focal-plane vehicle head-up display system and a vehicle. The system includes: a first waveguide display module for emitting light; a near-focal-plane transmission module disposed on one side of the first waveguide display module for forming near-focal-plane image light; and / or a far-focal-plane transmission module disposed on one side of the first waveguide display module and on the same side or opposite side to the near-focal-plane transmission module for forming far-focal-plane image light. This invention achieves dual-focal-plane display without significantly increasing the system size by configuring the near-focal-plane transmission module and the far-focal-plane transmission module on one side of the first waveguide display module, and by using the angle selection of the near-focal-plane transmission module and the far-focal-plane transmission module to control light rays at different angles to enter different optical paths, thereby forming far-focal-plane and near-focal-plane images respectively. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a dual-focal-surface vehicle head-up display system provided in an embodiment of the present invention;

[0024] Figure 2 An angular transmission and reflection spectrum of a dual-focal-plane vehicle head-up display system provided in an embodiment of the present invention;

[0025] Figure 3 This invention provides an embodiment of a dual-focal-plane vehicle head-up display system with another angle of transmission and reflection spectrum.

[0026] Figure 4 This is a schematic diagram of the first substructure of a dual-focal-area vehicle head-up display system provided in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the second substructure of a dual-focal-area vehicle head-up display system provided in an embodiment of the present invention;

[0028] Figure 6This is a schematic diagram of the third substructure of a dual-focal-plane vehicle head-up display system provided in an embodiment of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] Please see below. Figure 1 This invention provides a dual-focal-plane vehicle head-up display system, comprising:

[0034] First waveguide display module 1, used for outputting light;

[0035] The near-focal plane transmission module 3 is disposed on one side of the first waveguide display module 1 and is used to form near-focal plane image light rays;

[0036] And / or, the far-focus transmission module 2 is disposed on one side of the first optical waveguide display module 1 and on the same side or opposite side of the near-focus transmission module 3, for forming far-focus image light rays.

[0037] This embodiment sets up a near-focal plane transmission module and a far-focal plane transmission module on one side of the first optical waveguide display module. By using the angle selection of the far-focal plane transmission module and the near-focal plane transmission module, light rays at different angles enter different optical paths to form far-focal plane images and near-focal plane images respectively. This achieves the effect of dual-focal plane display without significantly increasing the system size.

[0038] In a specific embodiment, the first optical waveguide display module 1 includes a diffraction waveguide plate and a projection device, which can be a micro projector, etc.

[0039] In one embodiment, the first waveguide display module 1 emits light rays with a first polarization state at different angles;

[0040] The near-focal surface transmission module 3 is a near-focal surface transmission film. The near-focal surface transmission film is disposed below the first waveguide display module 1 and is used to selectively transmit light of the first polarization state and to fully transmit light of the second polarization state to form near-focal surface image light. The second polarization state light is obtained by a light conversion module disposed below the near-focal surface transmission module, and the photoelectric field direction of the first polarization state light is perpendicular to the photoelectric field direction of the first polarization state light.

[0041] The far-focus transmission module 2 is a far-focus transmission film. The far-focus transmission film is disposed above the first waveguide display module 1 and is used to selectively transmit light of the first polarization state and to fully transmit light of the first polarization state, so as to form far-focus image light.

[0042] In this embodiment, the far-focus transmission module 2 is disposed on one side of the first optical waveguide display module 1. This module has selective transmission characteristics for light rays at different angles in the first polarization direction, that is: it transmits light rays corresponding to the far-focus image direction and reflects light rays corresponding to the near-focus image direction (e.g., ...). Figure 2 The near-focus transmission module 3 is arranged on one side of the first optical waveguide display module 1. This module has selective transmission characteristics for light rays at different angles of the first polarization direction, that is, it transmits light rays corresponding to the near-focus image direction and reflects light rays corresponding to the far-focus image direction, as shown in the angular transmission and reflection spectrum of the near-focus transmission film. At the same time, this module has full transmission characteristics for light rays in the second polarization direction; the first and second polarization photoelectric field directions are perpendicular to each other. In addition, a light conversion module 4 is arranged below the near-focus transmission module 3. Its function is to convert the first polarization state light rays into the second polarization state light rays and to form a virtual image of the waveguide light rays at a finite distance.

[0043] Furthermore, the angular transmittance and reflectance spectra of the far-focus and near-focus transmissive films generally exhibit complementary characteristics; they can be perfectly complementary or partially overlapping. Figure 3As shown, the design can be differentiated vertically, horizontally, or in other ways depending on the display requirements for near and far distances. It should also be noted that both the near-focal-area transmissive film and the far-focal-area transmissive film described in this embodiment are optical thin films, and their reflection and transmission characteristics at different angles can be achieved through thin film design.

[0044] In one embodiment, the light conversion module 4 includes a quarter-wave plate 41 disposed below the near-focal surface transmission module 3 and a total internal reflection lens 42 disposed below the quarter-wave plate 41.

[0045] In this embodiment, the light conversion module 4 includes a quarter-wave plate 41 and a total reflection lens 42. The quarter-wave plate 41 is used to convert the first polarized light into a second polarized light after it passes through twice. The total reflection lens 42 can adjust the imaging distance of the light emitted from the waveguide to the reflection lens and generate a virtual image at a limited distance, which can be 0.1 to 20 meters.

[0046] In this embodiment, when the first polarized light rays in the direction of the far focal plane are emitted upward from the first optical waveguide display module 1, they pass through the far focal plane transmission module 2 above the first optical waveguide display module 1. Due to the transmission characteristics of the far focal plane light rays in the direction of the first polarized light rays, the emission purpose is achieved. When the light rays in the direction of the far focal plane are emitted downward from the first optical waveguide display module 1, they are reflected upward by the near focal plane transmission module 3 below the first optical waveguide display module 1, and then pass through the first optical waveguide display module 1 and the far focal plane transmission module 2 above it to achieve the emission purpose and finally form the far focal plane image light rays.

[0047] When the first polarized light beam, directed towards the near-focal plane, exits upward from the waveguide plate, it passes through the far-focal plane transmission layer above the waveguide. Due to the reflection characteristics of the near-focal plane light beam, the first polarized light beam is reflected downward. After passing through the waveguide, it encounters the near-focal plane transmission module 3. Due to the transmission characteristics of the near-focal plane light beam, the first polarized light beam is transmitted downward. It then passes sequentially through the quarter-wave plate 41 and the total internal reflection lens 42 before being reflected upward. After continuing upward through the quarter-wave plate 41, it is converted into a second polarized light beam. Due to the complete transmission characteristics of the far-focal plane transmission module 2 and the near-focal plane transmission module 3 for the second polarized light beam, the second polarized light beam then passes upward sequentially through the near-focal plane transmission module 3, the first optical waveguide display module 1, and the far-focal plane transmission module 3. After passing through module 2, the light is emitted to achieve the purpose of emission. When the first polarized light in the near-focal plane direction is emitted downward from the first optical waveguide display module 1, it passes through the near-focal plane transmission module 3. Due to the transmission characteristics of the first polarized light in the near-focal plane direction, the first polarized light is transmitted downward and then passes through the quarter-wave plate 41 and the total reflection lens 42 in sequence before being reflected upward. After continuing upward and encountering the quarter-wave plate 41, it is converted into second polarized light. Due to the complete transmission characteristics of the far-focal plane transmission module 2 and the near-focal plane transmission module 3 for the second polarized light, the second polarized light then passes upward through the near-focal plane transmission module 3, the first optical waveguide display module 1, and the far-focal plane transmission module 2 in sequence before being emitted, thus achieving the purpose of emission and finally forming the near-focal plane image light.

[0048] In one embodiment, the near-focal surface transmission module 3 is a lens element with adjustable focal length.

[0049] Furthermore, the far-focus transmission module 2 is a second optical waveguide display module. This embodiment utilizes the transparency of waveguides, making the second optical waveguide display module the far-focus transmission module 2, allowing light to be emitted directly, forming an image displayed at a distance, i.e., the far-focus image light.

[0050] In this embodiment, combined with Figure 4 As shown, a lens element with adjustable focal length is added to the light-emitting surface of the first optical waveguide display module 1. This allows the emitted light from the waveguide to generate a virtual image at a limited close distance, forming a near-focal plane image ray. Simultaneously, a second optical waveguide display module is positioned above the lens element. The transparency of the waveguide allows light to be emitted directly, forming an image displayed at a distance, i.e., a far-focal plane image ray. In other words, by combining the second optical waveguide display module and the lens element, a dual-focal plane display effect can be achieved. Specifically, the second optical waveguide display module includes a micro-projector and an optical waveguide.

[0051] This embodiment uses a waveguide (i.e., the second optical waveguide display module) in conjunction with a lens to achieve close-range image display. Simultaneously, taking advantage of the waveguide's transparency, another waveguide display system is placed above it to achieve long-distance image display. Compared to traditional waveguide display solutions that typically have only one focal plane, this embodiment achieves two focal planes without significantly increasing the system size.

[0052] In one embodiment, the near-focal surface transmission module 3 is a direct display screen, which is disposed below the first waveguide display module 1.

[0053] In this embodiment, combined with Figure 5 As shown, the light emitted from the first optical waveguide display module 1 is reflected by the windshield to form an image at near infinity (i.e., the telephoto image light). This image can be used for AR virtual reality interaction, such as road guidance navigation, information prompts / warnings, and other functions. A direct-view display screen is placed below the first optical waveguide display module 1. This direct-view display screen can be a liquid crystal display screen, an OLED display screen, an LED display screen, etc. Due to the transparency of the waveguide, the image displayed on the direct-view display screen is reflected by the windshield to form a close-range mirror image. This mirror image can be used to display basic vehicle information, such as vehicle speed / fuel level, thereby achieving the effect of dual-focal-plane display. Furthermore, this embodiment significantly reduces the system size compared to existing technologies.

[0054] In one embodiment, the near-focal surface transmission module 3 is a HUD projection module, which is disposed below the first waveguide display module 1.

[0055] Specifically, the HUD projection module includes a third optical waveguide display module 31 and a reflection unit 32, with the reflection unit 32 disposed between the first optical waveguide display module 1 and the third optical waveguide display module 31.

[0056] In this embodiment, combined with Figure 6As shown, the light emitted from the first optical waveguide display module 1 is reflected by the windshield to form an image at near infinity (i.e., the far-focus image light). This image can be used for AR virtual reality interaction, such as road guidance navigation, information prompts / warnings, and other functions. Simultaneously, a HUD projection module, such as a reflector, is placed below the first optical waveguide display module 1. This HUD projection module may include a third optical waveguide display module 31 and a reflection unit 32. Because the waveguide is transparent, the image displayed directly on the screen is reflected by the windshield to form a near-field mirror image (i.e., the near-focus image light). This mirror image can be used to display basic vehicle information, such as vehicle speed / fuel level, thereby achieving a dual-focal-plane display effect. In a specific embodiment, the third optical waveguide display module 31 may include a micro-projector and an optical waveguide. The reflection unit 32 includes at least one reflector, which is tilted between the first optical waveguide display module 1 and the third optical waveguide display module 31 to reflect the light emitted from the third optical waveguide display module 31 back into the first optical waveguide display module 1. Similarly, the first optical waveguide display module 1 may also include a micro projector and an optical waveguide.

[0057] It is important to understand that for traditional reflective projection HUDs, designing a dual-focal-plane design often increases the module size by 2-3 liters due to the additional optical path space introduced by the second focal-plane. This embodiment utilizes the transparency and small size of waveguides, placing the transparent waveguide (i.e., the first optical waveguide display module 1) above the traditional reflective projection HUD. This allows for both a distant image via the transparent waveguide and a near-distance focal-plane via the traditional reflective projection HUD, creating a dual-focal-plane HUD system. Furthermore, in this embodiment, the overall system size is not significantly increased compared to a traditional single-focal-plane reflective projection HUD.

[0058] This invention also provides a vehicle that employs the dual-focal-surface vehicle head-up display system as described in any of the preceding embodiments.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0060] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A dual focal plane vehicle head-up display system, comprising: include: The first waveguide display module is used for outputting light rays; A near-focal plane transmission module is disposed on one side of the first waveguide display module and is used to form near-focal plane image light rays; The far-focus transmission module is disposed on one side of the first waveguide display module and on the same side or opposite side of the near-focus transmission module, and is used to form far-focus image light rays; The first waveguide display module emits light rays with first polarization states at different angles; The near-focal surface transmission module is a near-focal surface transmission film, which is disposed below the first waveguide display module. It is used to selectively transmit light of the first polarization state and to fully transmit light of the second polarization state to form near-focal surface image light. The second polarization state light is obtained by a light conversion module disposed below the near-focal surface transmission module, and the photoelectric field direction of the first polarization state light is perpendicular to the photoelectric field direction of the first polarization state light. The far-focus transmission module is a far-focus transmission film. The far-focus transmission film is disposed above the first waveguide display module and is used to selectively transmit light of the first polarization state and to fully transmit light of the first polarization state, so as to form far-focus image light.

2. The bifocal head-up display system for a vehicle according to claim 1, characterized by, The angular transmittance and reflectance spectra of the near-focal surface transmittance film and the far-focal surface transmittance film have complementary characteristics, which are either completely complementary or partially complementary.

3. The bifocal head-up display system for vehicles according to claim 1, characterized by, The light conversion module includes a quarter-wave plate disposed below the near-focal surface transmission module and a total internal reflection lens disposed below the quarter-wave plate.

4. The bifocal, vehicular head-up display system of claim 1, wherein, The near-focal plane transmission module is a lens element with adjustable focal length, and the lens element is disposed above the first waveguide display module.

5. The bifocal head-up display system for a vehicle according to claim 4, characterized by The telephoto lens transmission module is a second optical waveguide display module, which is positioned above the lens element.

6. The bifocal, vehicular head-up display system of claim 1, wherein, The near-focal plane transmission module is a direct display screen, which is located below the first waveguide display module.

7. The bifocal, vehicular head-up display system of claim 1, wherein, The near-focal plane transmission module is a HUD projection module, which is located below the first waveguide display module.

8. The bifocal head-up display system for vehicles according to claim 7, characterized by The HUD projection module includes a third optical waveguide display module and a reflection unit, wherein the reflection unit is disposed between the first waveguide display module and the third optical waveguide display module.

9. A vehicle characterized by comprising: The dual-focal-plane vehicle head-up display system as described in any one of claims 1 to 8 is adopted.

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