A heads-up display glass, system, and vehicle

Abstract

The application discloses a head-up display glass, a system and a vehicle, and belongs to the technical field of glass, which comprises a glass body and an imaging module; the glass body comprises an outer glass plate, an inner glass plate and a connecting layer, the outer glass plate and the inner glass plate are arranged in parallel and oppositely, and the connecting layer is connected between the outer glass plate and the inner glass plate; the imaging module is fixedly connected on the glass body; the imaging module comprises at least two layers of transmission body holograms and one layer of reflection body hologram, the multiple layers of transmission body holograms and the one layer of reflection body hologram are sequentially arranged along the direction from the inner glass plate to the outer glass plate; the multiple layers of transmission body holograms respectively have corresponding incident angle ranges, and the incident angle ranges of each layer of transmission body hologram are not equal; the incident angle range of the reflection body hologram comprises the diffraction angle range of each layer of transmission body hologram, and the diffraction angle range of the reflection body hologram is not equal to the reflection angle range of the inner glass plate and the outer glass plate. The application solves the problem of eliminating ghosting of the head-up display of the automobile.

Description

Technical Field

[0001] This invention relates to the field of glass technology, and more specifically, to a head-up display glass, system, and vehicle. Background Technology

[0002] Head-up displays (HUDs) are a technology that projects important vehicle information onto the windshield, allowing drivers to access relevant information without looking down. With the development of intelligent and connected vehicles, HUD technology will be integrated with more automotive systems, displaying richer content such as external weather conditions and onboard diagnostic information. For HUD systems, the windshield has a double-layered structure with a laminated layer. Due to the different optical paths on the two surfaces, the light from the HUD is reflected twice, creating images that are clearly distinguishable to the human eye, resulting in ghosting. Currently, the main solution is to replace the interlayer with a wedge-shaped film, which can make the images from the two reflections overlap as much as possible. However, this wedge-shaped method increases the cost of HUD technology. Summary of the Invention

[0003] To address at least one aspect of the above-mentioned problems, the present invention provides a head-up display glass, a system, and a vehicle.

[0004] In a first aspect, this application provides a head-up display glass, including a glass body and an imaging module; the glass body includes an outer glass plate, an inner glass plate, and a connecting layer, the outer glass plate and the inner glass plate being parallel and opposite to each other, and the connecting layer connecting the outer glass plate and the inner glass plate; the imaging module is fixedly connected to the glass body; the imaging module includes at least two layers of transmissive holograms and one layer of reflective holograms, the multiple layers of transmissive holograms and the one layer of reflective holograms being arranged sequentially along the direction from the inner glass plate to the outer glass plate; the multiple layers of transmissive holograms each have a corresponding incident angle range, and the incident angle range of each layer of transmissive hologram is not equal; the incident angle range of the reflective hologram includes the diffraction angle range of each layer of transmissive hologram, such that incident light within the incident angle range is diffracted and deflected in the corresponding transmissive hologram to the reflective hologram and then diffracted again to converge and form an eye box area; the diffraction angle range of the reflective hologram is not equal to the reflection angle range of the inner glass plate and the outer glass plate, such that the light reflected by the inner glass plate or the outer glass plate deviates from the eye box area.

[0005] Preferably, in two adjacent layers of transmissive holograms, the diffraction angle range of the transmissive hologram farther from the reflective hologram is within the incident angle range of the transmissive hologram closer to the reflective hologram.

[0006] Preferably, the incident angle ranges of the multilayered transmissive holograms are equal.

[0007] Preferably, the incident angle range of the reflector holography is not equal to the incident angle range of the multilayer transmissive holography.

[0008] Preferably, the incident angle range of the reflector hologram is equal to the incident angle range of the transmissive hologram.

[0009] Preferably, the number of layers of the transmissive hologram is 2 to 4.

[0010] Preferably, the imaging module is fixedly connected between the outer glass plate and the inner glass plate or on the inner side of the inner glass plate.

[0011] Secondly, this application provides a head-up display system, including any of the above-described head-up display glass and an image generating device. The image generating device is installed inside the vehicle and faces the imaging module in the head-up display glass. The image generating device is connected to the vehicle host and is used to receive signals from the vehicle host and generate images based on the signals from the vehicle host.

[0012] Preferably, the image generation device includes a thin-film transistor, digital light processing, a silicon-based liquid crystal, and a laser beam scanning.

[0013] Thirdly, this application provides a vehicle that includes the head-up display system described above.

[0014] The head-up display glass, system, and vehicle of the present invention have the following beneficial effects:

[0015] This application designs a multi-layered holographic array as an imaging module. Several layers furthest from the outer glass plate are designed as transmissive holograms, while the last layer closest to the outer glass plate is designed as a reflective hologram. The transmissive and reflective holograms are designed with unequal incident angle ranges. The incident angle range of the reflective hologram is designed to include the diffraction angle range of each transmissive hologram layer, and the diffraction angle range of the reflective hologram is designed to be unequal to the reflection angle ranges of the inner and outer glass plates. Firstly, the multi-layered transmissive holograms can deflect light beams at different angles to the incident angle range of the reflective holograms for re-diffraction and convergence to form an eye-box region, achieving a head-up display function. Secondly, light reflected by the inner or outer glass plate deviates from the eye-box region, achieving ghosting elimination. Thirdly, by superimposing the incident angle ranges of the multi-layered holograms, most of the light emitted by the image generation device can be collected, thereby improving the energy utilization of the image generation device and eliminating ghosting. This invention has a simple structure, low cost, and high replaceability, and can achieve the effect of eliminating ghosting in car head-up displays. Attached Figure Description

[0016] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0017] Figure 1 A schematic diagram of a head-up display system according to an embodiment of the present invention is shown;

[0018] Figure 2 A schematic diagram of the optical path of a head-up display system according to an embodiment of the present invention is shown;

[0019] Figure 3 A schematic diagram of light intensity output is shown for a specific application embodiment of a head-up display glass according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Imaging module; 11. Transmitter holography; 12. Reflector holography; 2. Eye box; 3. Image generation device. Detailed Implementation

[0022] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0023] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0024] To at least partially address one or more of the aforementioned problems and other potential issues, embodiments of this disclosure provide a head-up display glass, such as Figure 1 and Figure 2 As shown, it includes a glass body and an imaging module 1; the glass body includes an outer glass plate, an inner glass plate and a connecting layer, the outer glass plate and the inner glass plate are arranged parallel and opposite to each other, and the connecting layer connects the outer glass plate and the inner glass plate.

[0025] The imaging module 1 is fixedly connected to the glass body. Preferably, the imaging module 1 is fixedly connected between the outer glass plate and the inner glass plate or on the inner side of the inner glass plate. The connection technology between the imaging module 1 and the glass body is existing technology. The imaging module 1 includes at least two layers of transmissive holograms 11 and one layer of reflective holograms 12. Preferably, the number of layers of transmissive holograms 11 is 2 to 4. The multiple layers of transmissive holograms 11 and the one layer of reflective holograms 12 are arranged in parallel along the direction from the inner glass plate to the outer glass plate.

[0026] Each of the multilayer transmissive holograms 11 has a corresponding incident angle range, and the incident angle ranges of each layer of transmissive holograms 11 are not equal. Preferably, the incident angle ranges of each layer of transmissive holograms 11 do not overlap. The incident angle range is the range of incident angles of the incident light rays that can diffract from the volume hologram. When the angle of the incident light ray is not within the incident angle range of a certain volume hologram, the incident light ray will pass directly through that layer of volume hologram without diffraction. The diffraction angle range is the range of diffraction angles of the diffracted light rays after diffraction from the volume hologram. Preferably, the incident angle ranges of the multilayer transmissive holograms 11 are equal in size, for example, the number of layers of transmissive holograms 11... The incident angle range of each layer of transmissive holography 11 is 7.5°. The incident angle range of the first layer of transmissive holography 11 is -3.75° to 3.75°, and the incident angle range of the second layer of transmissive holography 11 is 3.75° to 11.25°. More preferably, in two adjacent layers of transmissive holography 11, the diffraction angle range of the transmissive holography 11 that is far from the reflector holography 12 is within the incident angle range of the transmissive holography 11 that is close to the reflector holography 12, so that after the transmissive holography 11 that is far from the reflector holography 12 diffracts, the light enters the transmissive holography 11 that is close to the reflector holography 12 and diffracts again.

[0027] The incident angle range of the reflector hologram 12 includes the diffraction angle range of each layer of transmissive hologram 11, so that incident light within the incident angle range is diffracted and deflected in the corresponding transmissive hologram 11 and then diffracted again in the reflector hologram 12 to converge and form an image forming the eyebox 2 region; preferably, the incident angle range of the reflector hologram 12 is not equal to and does not overlap with the incident angle range of the multiple layers of transmissive hologram 11, further expanding the incident angle range of the imaging module 1; the diffraction angle range of the reflector hologram 12 is not equal to and does not overlap with the reflection angle range of the inner glass plate and the outer glass plate, so that the light reflected by the inner glass plate or the outer glass plate deviates from the eyebox 2 region, such as Figure 2As shown, θ1 is the incident angle of the imaging light emitted from the image generating device 3 on the imaging module 1, θ2 is the reflection angle of the same magnitude as θ1, θ3 is the diffraction angle of the imaging module 1, and its final diffracted light is imaged at the position of the eye box 2, and θ4 is the angle between the light emitted by the image generating device 3 and the horizontal axis of the vehicle coordinate system. Preferably, the incident angle range of the reflector hologram 12 is equal to that of the transmissive hologram 11. For example, the incident angle range of both the reflector hologram 12 and the transmissive hologram 11 is 7.5°. The transmissive hologram 11 has two layers. The incident angle range of the first transmissive hologram 11 is -3.75° to 3.75°, the incident angle range of the second transmissive hologram 11 is 3.75° to 11.25°, and the incident angle range of the reflector hologram 12 is 11.25° to 18.75°. Thus, the imaging module 1 can collect and image light within the range of -3.75° to 18.75°. Therefore, the multi-layer holographic series connection helps to collect most of the light emitted by the image generating device 3.

[0028] In one specific embodiment, the transmissive hologram 11 has two layers, and the imaging module 1 has three layers. The thickness of the three-layer volume hologram is 50 micrometers, and its angular selectivity and diffraction efficiency curves are as follows. Figure 3 As shown, the incident angle range of each volume hologram is 7.5°. The incident angle range of the first transmissive volume hologram 11 is -3.75° to 3.75°, the incident angle range of the second transmissive volume hologram 11 is 3.75° to 11.25°, and the incident angle range of the reflective volume hologram 12 is 11.25° to 18.75°. Thus, the imaging module 1 can collect and image light within the range of -3.75° to 18.75°, with a maximum imaging angle range of 22.5°. When a beam of light is incident at an incident angle of 0° into the first transmissive volume hologram 11 and diffracts, then at an incident angle of 7.5° into the second transmissive volume hologram 11 and diffracts again, and finally at an incident angle of 15° into the reflective volume hologram 12 and diffracts again, the maximum diffraction efficiency is 80% × 80% × 80% = 51.2%.

[0029] In one specific embodiment, the transmissive hologram 11 has 3 layers, and the imaging module 1 has a total of 4 layers. The thickness of the 4-layer volume hologram is 50 micrometers, and its angular selectivity and diffraction efficiency curves are as follows. Figure 3As shown, the incident angle range of each volume holographic layer is 7.5°. Specifically, the incident angle range of the first transmissive volume holographic layer 11 is -3.75° to 3.75°, the second transmissive volume holographic layer 11 is 3.75° to 11.25°, the third transmissive volume holographic layer 11 is 11.25° to 18.75°, and the incident angle range of the reflective volume holographic layer 12 is 18.75° to 26.25°. Therefore, the imaging module 1 can capture images from -3.75° to 26.25°. The light rays within the range are collected and imaged, with a maximum imaging angle range of 30°. When a beam of light is incident at an incident angle of 0° into the first layer of the transmissive hologram 11 and diffracts, then incident at an incident angle of 7.5° into the second layer of the transmissive hologram 11 and diffracts again, then incident at an incident angle of 15° into the third layer of the transmissive hologram 11 and diffracts again, and finally incident at an incident angle of 22.5° into the reflective hologram 12, the maximum diffraction efficiency is obtained as 80%×80%×80%×80%=40.96%.

[0030] This application also provides a head-up display system, such as Figure 1 and Figure 2 As shown, the device includes a head-up display (HUD) glass and an image generating device 3 as described above. The image generating device 3 is installed inside the vehicle and faces the imaging module 1 in the HUD glass. The image generating device 3 is connected to the vehicle's main unit and is used to receive signals from the vehicle's main unit and generate images based on the signals from the vehicle's main unit. Preferably, the image generating device 3 includes thin-film transistors, digital light processing, liquid crystal on silicon (LCD), and laser beam scanning.

[0031] This application also provides a vehicle that includes the head-up display system described above.

[0032] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand this document.

Claims

1. A head-up display glass, characterized in that: The system includes a glass body and an imaging module (1); the glass body includes an outer glass plate, an inner glass plate, and a connecting layer, the outer and inner glass plates being parallel and opposite to each other, and the connecting layer connecting the outer and inner glass plates; the imaging module (1) is fixedly connected to the glass body; the imaging module (1) includes at least two layers of transmissive holograms (11) and one layer of reflective holograms (12), the multiple transmissive holograms (11) and the one layer of reflective holograms (12) being arranged sequentially along the direction from the inner glass plate to the outer glass plate; the multiple transmissive holograms (11) each have a corresponding incident angle range, and The incident angle range of each layer of transmissive hologram (11) is not equal; the incident angle range of reflective hologram (12) includes the diffraction angle range of each layer of transmissive hologram (11), so that the incident light within the incident angle range is diffracted and deflected in the corresponding transmissive hologram (11) and then diffracted in the reflective hologram (12) to converge and form an eyebox (2) region; the diffraction angle range of reflective hologram (12) is not equal to the reflection angle range of the inner glass plate and the outer glass plate, so that the light reflected by the inner glass plate or the outer glass plate deviates from the eyebox (2) region.

2. The head-up display glass according to claim 1, characterized in that: In the two adjacent layers of the transmissive hologram (11), the diffraction angle range of the transmissive hologram (11) that is far from the reflective hologram (12) is within the incident angle range of the transmissive hologram (11) that is close to the reflective hologram (12).

3. A head-up display glass according to claim 1, characterized in that: The incident angle range of the multilayered transmissive hologram (11) is equal.

4. A head-up display glass according to claim 1, characterized in that: The incident angle range of the reflector hologram (12) is not equal to that of the multilayer transmissive hologram (11).

5. A head-up display glass according to claim 1, characterized in that: The incident angle range of the reflector hologram (12) is equal to that of the transmission hologram (11).

6. A head-up display glass according to claim 1, characterized in that: The number of layers in the transmissive hologram (11) is 2 to 4.

7. A head-up display glass according to claim 1, characterized in that: The imaging module (1) is fixedly connected between the outer glass plate and the inner glass plate or on the inner side of the inner glass plate.

8. A head-up display system, characterized in that: The device includes a head-up display glass and an image generating device (3) as described in any one of claims 1 to 7. The image generating device (3) is installed inside the vehicle and faces the imaging module (1) in the head-up display glass. The image generating device (3) is connected to the vehicle host and is used to receive signals from the vehicle host and generate images based on the signals from the vehicle host.

9. A head-up display system according to claim 8, characterized in that: The image generation device (3) includes a thin-film transistor, digital light processing, silicon-based liquid crystal, and laser beam scanning.

10. A vehicle, characterized in that: Including a head-up display system as described in claim 8 or 9.

Images