Single-optical-engine-based dual-focal-surface vehicle-mounted head-up display system and vehicle

Abstract

The application discloses a kind of double focal plane vehicle head-up display systems and vehicles based on single optical engine, and the system includes: optical engine, for emitting light beam, the light beam includes first light beam and second light beam;Diffractive optical waveguide, for the light beam that is incident through entry pupil area is coupled expansion beam, the light beam that is incident through other area is transmitted;Windshield, for the light beam that diffractive optical waveguide emits is reflected;First lens group, it is arranged between the optical path of optical engine and diffractive optical waveguide, for by the first light beam to form first optical path;Second lens group, it is arranged between the optical path of optical engine and diffractive optical waveguide, for by the second light beam to form second optical path, amplification module is arranged on the second optical path, for the second light beam is amplified twice.The application can achieve the effect that single optical engine realizes double focal plane virtual image display, and also can make system overall volume smaller.

Description

Technical Field

[0001] This invention relates to the field of vehicle head-up display technology, and in particular to a dual-focal-plane vehicle head-up display system and vehicle based on a single optical engine. Background Technology

[0002] With the development of in-vehicle display systems, head-up display (HUD) systems can ensure that drivers can see information such as the instrument panel, navigation, and road conditions without taking their eyes off the road. This allows them to obtain driving-related information without looking down while driving. HUDs present driving safety, road navigation information, and real-world information to the user. Major automakers have successively adopted HUDs as a standard feature of next-generation automotive displays, and replacing the instrument panel with a HUD is the future direction. This requires the HUD to produce at least two focal planes in real-world conditions: one for displaying simple instrument panel information (vehicle speed, oil pressure, tire pressure) at close range, and the other for displaying navigation, ADAS (Advanced Driver Assistance Systems), and relevant road information at a long distance.

[0003] Currently, most mainstream HUD displays use a single focal plane, especially in matched diffractive waveguide HUD solutions, where the aforementioned functions cannot be achieved by directly segmenting the image at the light exit position of the display module. Traditional HUD image segmentation typically involves a central real image or the display screen itself, using light beams to split between the central real image and the display screen to achieve different virtual image focal planes. However, matched diffractive waveguide HUDs require a pupil at the light entry point, similar to the exit pupil of an eyepiece. Since each field of view corresponds to a complete pixel plane at the exit pupil, image region segmentation cannot be achieved by partially separating light beams at this point. Summary of the Invention

[0004] This invention provides a dual-focal-plane vehicle head-up display system and vehicle based on a single optical engine, aiming to achieve multiple virtual image focal planes through the same optical engine.

[0005] This invention provides a dual-focal-plane vehicle head-up display system based on a single optical engine, comprising:

[0006] An optical engine for emitting a light beam, the light beam comprising a first beam and a second beam;

[0007] A diffractive waveguide, including an entrance pupil region, is used to couple and expand a light beam incident through the entrance pupil region, and to transmit a light beam incident through a region other than the entrance pupil region.

[0008] A windshield is used to reflect the beam of light emitted by the diffracted light waveguide so that it can enter the human eye;

[0009] A first lens group is arranged between the optical engine and the light path of the diffractive optical waveguide, and is used to pass the first light beam to form a first light path;

[0010] A second lens group is arranged between the optical engine and the light path of the diffractive optical waveguide, and is used to pass the second light beam to form a second light path, and an amplification module is arranged on the second light path, and is used to perform secondary amplification on the second light beam;

[0011] The first light beam forms a spot consistent with the size of the entrance pupil region of the diffractive optical waveguide after passing through the first light path, and forms a long-distance image after sequentially passing through the diffractive optical waveguide and the windshield glass; the second light beam is amplified twice via the second light path, and forms a close-range image after sequentially passing through the diffractive optical waveguide and the windshield glass.

[0012] Further, a light splitting module is arranged in front of the exit end of the optical engine, and is used to split the light beam emitted by the optical engine into the first light beam and the second light beam.

[0013] Further, the light splitting module is a polaroid, and the amplification module includes a diffusion sheet and a first mirror.

[0014] Further, the polaroid is arranged in the light path of the optical engine and the second lens group, and is used to reflect a part of the light beam emitted by the optical engine to the second lens group to form the second light beam.

[0015] Further, the second lens group, the diffusion sheet, and the first mirror are sequentially arranged along the propagation direction of the second light path.

[0016] Further, the polaroid is arranged in the light path of the optical engine and the first lens group, and is arranged in the light path of the optical engine and the second lens group, and the diffractive optical waveguide is arranged in the light path of the optical engine and the second lens group;

[0017] The polaroid is used to reflect a part of the light beam emitted by the optical engine to the first lens group to form the first light beam, and reflect the remaining part of the light beam to the diffractive optical waveguide, and after being emitted by the diffractive optical waveguide, the light beam enters the second lens group to form the second light beam.

[0018] Further, the amplification module further includes a second mirror, and the second lens group, the second mirror, the diffusion sheet, and the first mirror are sequentially arranged along the propagation direction of the second light path.

[0019] Further, the first mirror is a curved mirror, and the second mirror is a plane mirror.

[0020] Further, the second lens group is a mirror group with a quarter wave plate.

[0021] The embodiment of the present application also provides a vehicle adopting the single-optical-engine-based dual-focal-surface vehicle-mounted head-up display system according to any one of the above.

[0022] The embodiment of the present application provides a single-optical-engine-based dual-focal-surface vehicle-mounted head-up display system and a vehicle, the system comprising: an optical engine for emitting a light beam, the light beam comprising a first light beam and a second light beam; a diffractive optical waveguide comprising an entrance pupil region, the diffractive optical waveguide being configured to couple and expand the light beam incident via the entrance pupil region and to transmit the light beam incident via a region other than the entrance pupil region; a windshield configured to reflect the light beam emitted by the diffractive optical waveguide to enter a human eye; a first lens group arranged between the optical engine and the light path of the diffractive optical waveguide and configured to pass through the first light beam to form a first light path; and a second lens group arranged between the optical engine and the light path of the diffractive optical waveguide and configured to pass through the second light beam to form a second light path, the second light path being provided with a magnification module configured to perform secondary magnification on the second light beam; wherein the first light beam forms a spot consistent with the size of the entrance pupil region of the diffractive optical waveguide after passing through the first light path, and forms a long-distance image after sequentially passing through the diffractive optical waveguide and the windshield; and the second light beam is secondary magnified via the second light path, and forms a close-range image after sequentially passing through the diffractive optical waveguide and the windshield. The embodiment of the present application divides the light beam emitted by the same optical engine 1 into the first light beam and the second light beam for propagation by arranging the first light path and the second light path, wherein the first light beam forms a long-distance virtual image after propagating in the first light path through the first lens group and the diffractive optical waveguide, and the second light beam forms a close-range virtual image after propagating in the second light path through the second lens group and the diffractive optical waveguide, so as to achieve the effect of realizing dual-focal-surface virtual image display by a single optical engine, and also make the overall volume of the system smaller, thereby improving product performance and user experience, and ensuring the comfort and safety during driving. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The structure diagram of the single-optical-engine-based dual-focal-surface vehicle-mounted head-up display system provided by the embodiment of the present application is shown in the figure.

[0025] Figure 2A first sub-structure schematic diagram of a dual-focal-surface vehicle-mounted head-up display system based on a single optical engine is provided for an embodiment of the present application.

[0026] Figure 3 A second sub-structure schematic diagram of a dual-focal-surface vehicle-mounted head-up display system based on a single optical engine is provided for an embodiment of the present application.

[0027] Figure 4 A third sub-structure schematic diagram of a dual-focal-surface vehicle-mounted head-up display system based on a single optical engine is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0029] It should be understood that, when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0030] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application 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.

[0031] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0032] Please see Figure 1 The present application embodiment provides a dual-focal-surface vehicle-mounted head-up display system based on a single optical engine, comprising:

[0033] An optical engine 1 for emitting light beams, the light beams comprising first light beams and second light beams;

[0034] A diffractive optical waveguide 2 comprising an entrance pupil region, the diffractive optical waveguide being configured to couple and expand the light beams incident via the entrance pupil region, and to transmit the light beams incident via regions other than the entrance pupil region;

[0035] a windshield glass 3 for reflecting the light beams emitted by the diffractive optical waveguide 2 to enter the human eye;

[0036] a first lens group 4 arranged between the optical engine 1 and the light path of the diffractive optical waveguide 2, for passing the first light beams to form a first light path;

[0037] a second lens group 5 arranged between the optical engine 1 and the light path of the diffractive optical waveguide 2, for passing the second light beams to form a second light path, and an amplification module 6 arranged on the second light path for twice amplifying the second light beams;

[0038] The first light beams pass through the first light path to form a light spot consistent with the size of the entrance pupil area of the diffractive optical waveguide 2, and form a long-distance image after passing through the diffractive optical waveguide 2 and the windshield glass 3 in turn; the second light beams are twice amplified via the second light path, and form a close-range image after passing through the diffractive optical waveguide 2 and the windshield glass 3 in turn.

[0039] In this embodiment, the dual-focus head-up display system for vehicles includes an optical engine 1, a diffractive optical waveguide 2, a windshield glass 3, a first lens group 4 and a second lens group 5. The first lens group 4 is used to form a first light path to propagate the first light beams into a light spot consistent with the size of the entrance pupil area of the diffractive optical waveguide 2, so that the first light beams are coupled and expanded after being incident on the entrance pupil area of the diffractive optical waveguide 2, thereby forming a long-distance virtual image; the second lens group 5 is used to form a second light path, and an amplification module is arranged in the second light path to twice amplify the second light beams, so that the second light beams directly pass through the diffractive optical waveguide and form a close-range virtual image after being reflected by the windshield glass 3.

[0040] In this embodiment, the light beams emitted by the same optical engine 1 are divided into first light beams and second light beams for propagation, wherein the first light beams form a long-distance virtual image after passing through the first lens group 4 and the diffractive optical waveguide 2 in the first light path, and the second light beams form a close-range virtual image after passing through the second lens group 5 and the diffractive optical waveguide 2 in the second light path, thereby achieving the effect of realizing dual-focus virtual image display by a single optical engine 1. Moreover, this embodiment can also make the overall volume of the system smaller, thereby improving product performance and user experience, and ensuring the comfort and safety during driving.

[0041] It should be further noted that in this embodiment, the optical engine 1 and the first lens group 4 can form an ocular system to match the entrance pupil of the diffractive optical waveguide 2, and the optical engine 1 and the second lens group 5 can form an imaging system to match the amplification module area. The optical engine 1 in this embodiment can be a display device such as DLP, LBS, LCOS, microLED, etc.

[0042] In an embodiment, a light splitting module 7 is further included, which is arranged in front of the exit end of the optical engine 1 and is used to split the light beam emitted by the optical engine 1 into the first light beam and the second light beam.

[0043] Specifically, the light splitting module 7 is a polaroid, and the amplification module 6 further includes a diffusion sheet 61 and a first mirror 62. The polaroid can control the polarization direction of a specific light beam. When a light beam passes through the polaroid, the light whose vibration direction is perpendicular to the transmission axis of the polaroid will be absorbed, and the transmission light only remains the polarized light whose vibration direction is parallel to the transmission axis of the polaroid. In a specific embodiment, the material of the diffusion sheet is glass or resin, and the polaroid is an absorption type polaroid, that is, a part of light is reflected after passing through the polaroid, and another part of light is absorbed by the polaroid.

[0044] In an embodiment, the polaroid is arranged in the light path of the optical engine 1 and the second lens group 5, and is used to reflect a part of the light beam emitted by the optical engine 1 to the second lens group 5 to form the second light beam.

[0045] Further, the second lens group 5, the diffusion sheet 61 and the first mirror 62 are sequentially arranged along the second light path propagation direction.

[0046] In this embodiment, in combination with Figure 2 , a part of the light beam emitted by the optical engine 1 is taken as the first light beam, enters the first lens group 1 through the first light path, and is directly incident on the diffractive optical waveguide 2 from the first lens group 1, and then is emitted to the windshield glass 3 by the diffractive optical waveguide 2, thereby forming a distant view image; the remaining part of the light beam emitted by the optical engine 1 is taken as the second light beam, is reflected to the second light path through the polaroid, and enters the first lens group 2, and then is reflected by the second lens group 2, sequentially passes through the diffusion sheet 61 and the first mirror 62 to achieve secondary amplification, and then is incident on the diffractive optical waveguide 2, and after propagating through the diffractive optical waveguide 2 and the windshield glass 3, a close view image is formed. Here, the first lens group includes a plurality of lenses, and the second lens group 5 is a mirror group with a quarter wave plate, that is, the second lens group 5 includes a quarter wave plate and a plurality of lenses, and the surface of one of the lenses is coated with a reflective film, and the formed reflecting surface is a plane or a curved surface. In addition, the optical engine 1 and the first lens group 4 in this embodiment can form a ocular system, and the first light beam emitted through the first lens group 4 will form a circular light spot with a size of 2-5 mm, thereby matching the entrance pupil of the diffractive optical waveguide 2.

[0047] The display screen of the optical engine 1 can be divided into A and B areas through the above setting, wherein the light rays of the A area enter the first lens group 4, and the light rays of the B area enter the second lens group 5, so that two independent display areas can finally form focal planes with different virtual image distances.

[0048] In another embodiment, as shown in Figure 3 part of the light beams emitted by the optical engine 1 enter the first lens group 1 as the first light beams through a first light path, form a circular light spot with a diameter of 2-5 mm, and then enter the diffraction optical waveguide 2, and then are emitted from the diffraction optical waveguide 2 to the windshield 3, thereby forming a far view image; the remaining part of the light beams emitted by the optical engine 1 enter the second light path through reflection of the polarizer, and sequentially pass through the first lens group 2, the diffusion sheet 61 and the first mirror 62 to realize secondary magnification, and continue to enter the diffraction optical waveguide 2, and then form a near view image after propagating through the diffraction optical waveguide 2 and the windshield 3.

[0049] In actual application, the distance from the near view virtual image generated by the second light path to the human eye can be adjusted by adjusting the distance between the diffusion sheet 61 and the first mirror 62, and the second light path is generally used for near distance display within 1-3 m, and is specifically used for displaying instrument panel information.

[0050] In an embodiment, the polarizer is arranged in the light path between the optical engine 1 and the first lens group 4 and in the light path between the optical engine 1 and the second lens group 5, and the diffraction optical waveguide 2 is arranged in the light path between the optical engine 1 and the second lens group 5;

[0051] The polarizer is used for reflecting part of the light beams emitted by the optical engine 1 to the first lens group 4 to form the first light beams, and reflecting the remaining part of the light beams to the diffraction optical waveguide 2, and then entering the second lens group 5 after being emitted from the diffraction optical waveguide 2 to form the second light beams.

[0052] In addition, the magnification module 6 further comprises a second mirror 63, and the second lens group 5, the second mirror 63, the diffusion sheet 61 and the first mirror 62 are sequentially arranged along the propagation direction of the second light path. In a specific embodiment, the first mirror 62 is a curved mirror, and the second mirror 63 is a plane mirror.

[0053] In this embodiment, the combination of Figure 4The light beam emitted by the optical engine 1 enters the first light path as a first light beam after being reflected by the polaroid, and is incident into the diffractive optical waveguide 2 via the first lens group 1, and then is emitted from the diffractive optical waveguide 2 to the windshield 3, thereby forming a far view image; another part of the light beam emitted by the optical engine 1 enters the diffractive optical waveguide 2 as a second light beam after being reflected by the polaroid, and then is emitted from the diffractive optical waveguide 2 to the second lens group, and then enters the diffractive optical waveguide 2 again after sequentially passing through the second reflecting mirror 63, the diffusion sheet 61 and the first reflecting mirror 62, and then forms a near view image after propagating through the diffractive optical waveguide 2 and the windshield 3.

[0054] The same optical engine 1 is adopted in the embodiment, and different two optical systems are designed, the eyepiece system required by the waveguide is matched, and the imaging system required by the diffusion sheet is matched, so that different regions of the same image can realize the imaging requirements of the two focal planes of the near distance and the far distance, a single system is not required to complete, the problem that the diffractive optical waveguide cannot directly perform image segmentation at the entrance pupil is solved, the system volume is reduced, and the production cost is saved.

[0055] The embodiment of the application further provides a vehicle adopting the single-optical-engine-based dual-focal-plane vehicle-mounted head-up display system.

[0056] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other. For the system disclosed by the embodiments, since the system corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part. It should be pointed out that, for ordinary skilled in the art, without departing from the principles of the application, some improvements and modifications can be made to the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

[0057] It should be further noted that, in the specification, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between the entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to the process, method, article or equipment. Without more limitation, the element defined by the statement “including a…” does not exclude the presence of another same element in the process, method, article or equipment including the element.

Claims

1. A single-optical-engine-based dual-focal-plane vehicle head-up display system, characterized by, Comprise: an optical engine for emitting a light beam, the light beam comprising a first light beam and a second light beam; a diffractive optical waveguide comprising an entrance pupil region, the diffractive optical waveguide for coupling expanding a light beam incident via the entrance pupil region and transmitting a light beam incident via a region other than the entrance pupil region; a windshield for reflecting the light beam emitted by the diffractive optical waveguide to enter a human eye; a first lens group arranged between the optical engine and the light path of the diffractive optical waveguide for passing the first light beam to form a first light path; a second lens group arranged between the optical engine and the light path of the diffractive optical waveguide for passing the second light beam to form a second light path, the second light path being provided with a magnifying module for secondary magnifying the second light beam; wherein the first light beam forms a spot consistent with the size of the entrance pupil region of the diffractive optical waveguide after passing the first light path, and forms a distant view image after sequentially passing the diffractive optical waveguide and the windshield; and the second light beam is secondary magnified via the second light path, and forms a close view image after sequentially passing the diffractive optical waveguide and the windshield.

2. The single-optical-engine based dual-focal-plane vehicular head-up display system of claim 1, wherein, Further comprising a light splitting module arranged in front of the exit end of the optical engine and for splitting the light beam emitted by the optical engine into the first light beam and the second light beam.

3. The single-optical-engine based dual-focal-plane vehicular head-up display system of claim 2, wherein, The light splitting module is a polaroid, and the magnifying module comprises a diffusion sheet and a first mirror.

4. The single-optical-engine based dual-focal-plane vehicular head-up display system of claim 3, wherein, The polaroid is arranged in the light path of the optical engine and the second lens group, and is used for reflecting a part of the light beam emitted by the optical engine to the second lens group to form the second light beam.

5. The single-optical-engine based dual-focal-plane vehicular head-up display system of claim 4, wherein, The second lens group, the diffusion sheet and the first mirror are sequentially arranged along the propagation direction of the second light path.

6. The single-optical-engine based dual-focal-plane vehicular head-up display system of claim 3, wherein, The polaroid is arranged in the light path of the optical engine and the first lens group, and in the light path of the optical engine and the second lens group, and the diffractive optical waveguide is arranged in the light path of the optical engine and the second lens group; The polaroid is used for reflecting a part of the light beam emitted by the optical engine to the first lens group to form the first light beam, and reflecting the remaining part of the light beam to the diffractive optical waveguide, and after being emitted by the diffractive optical waveguide, entering the second lens group to form the second light beam.

7. The single-optical-engine based dual-focal-plane vehicular head-up display system of claim 6, wherein, The magnifying module further comprises a second mirror, and the second lens group, the second mirror, the diffusion sheet and the first mirror are sequentially arranged along the propagation direction of the second light path.

8. The single-optical-engine based dual-focal-plane vehicular head-up display system of claim 7, wherein, The first mirror is a curved mirror, and the second mirror is a plane mirror.

9. The single-optical-engine based dual-focal-plane vehicular head-up display system of claim 4, wherein, The second lens group is a mirror group with a quarter wave plate.

10. A vehicle characterized by comprising: The single optical engine based dual focal plane vehicle-mounted head-up display system according to any one of claims 1-9 is adopted.

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