Head-up display glass, system, vehicle and design method thereof

Abstract

The invention discloses head-up display glass, a system, a vehicle and a design method thereof. The head-up display glass comprises an imaging module; the imaging module comprises a layer of first reflector holography and at least one layer of second reflector holography which are sequentially arranged in the direction from the inner glass plate to the outer glass plate. The incident angle working range of the holographic inner side of the first reflector is matched with the angle range of incident light of the image generation device towards the glass, so that the incident light of the image generation device is reflected and diffracted by the holographic first reflector to be converged and imaged to form an eye box area; the incident angle working range of the outer side of the hologram of the first reflector is not equal to the incident angle working range of the outer side of the hologram of the second reflector, so that solar rays in the incident angle working range are reflected and diffracted to the outer side of the glass body in the corresponding hologram of the first reflector or the hologram of the second reflector. The problem of sunlight backflow in the head-up display technology can be solved, and the cost of the head-up display technology can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass, in particular to a head-up display glass, system, vehicle and design method thereof. BACKGROUND

[0002] The automobile head-up display is a technology that transmits important vehicle information to the front windshield, which can allow the driver to obtain relevant information without lowering his head, helping to reduce the driver's visual distraction and improve the driver's driving safety. For the head-up display system, when the external sunlight transmits through the front windshield glass, the light path coincides with the imaging beam path from the image generation device to the eyebox, which will cause the sunlight to backwash phenomenon, and will damage the image generation device and optical devices in the head-up display system under the long-term effect. At present, the mainstream way to solve the sunlight backwash in the industry is to coat a multilayer film on the surface of the image generation device and the optical device, mainly using the coating film to reduce the transmittance of infrared and ultraviolet light in sunlight, while ensuring the transmittance of visible light. However, this solution greatly increases the cost of the head-up display technology, and in actual application, the coating layer is easy to wear and age, and the protection effect decreases after long-term use, which requires regular maintenance or replacement, further increasing the cost, and even after the external sunlight is attenuated by the windshield, dust film, etc., it still has a certain power when it reaches the image generation device, which will cause irreversible damage after long-term effect, such as making the driving data appear blurred or distorted. SUMMARY

[0003] To solve at least one aspect of the above problem, the present application provides a head-up display glass, system, vehicle and design method thereof.

[0004] In a first aspect, the present application provides a head-up display glass, comprising 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 opposite, 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 a first reflector hologram and at least one second reflector hologram arranged in sequence along the direction from the inner glass plate to the outer glass plate; the incident angle working range of the inner side of the first reflector hologram matches the incident light ray angle range of the image generation device towards the glass, so that the incident light ray of the image generation device is reflected and diffracted by the first reflector hologram to converge and form an eyebox area; the incident angle working range of the outer side of the first reflector hologram is not equal to the incident angle working range of the outer side of the second reflector hologram, so that the sunlight rays in the incident angle working range are reflected and diffracted in the corresponding first reflector hologram or second reflector hologram to the outside of the glass body.

[0005] Preferably, the second reflector hologram is provided with multiple layers, the incident angle working ranges of the multiple layers of the second reflector hologram are not equal, and the incident angle working range of each layer of the second reflector hologram is not equal to the incident angle working range of the first reflector hologram.

[0006] Preferably, the incident angle working ranges of the multiple layers of the second reflector hologram are not overlapped, and the incident angle working range of each layer of the second reflector hologram is not overlapped with the incident angle working range of the first reflector hologram.

[0007] Preferably, the incident angle working ranges of the multiple layers of the second reflector hologram and the incident angle working range of the first reflector hologram are continuous.

[0008] Preferably, the incident angle working ranges of the multiple layers of the second reflector hologram are equal.

[0009] Preferably, the incident angle working range of the first reflector hologram is equal to the incident angle working range of the second reflector hologram.

[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] In a second aspect, the application provides a head-up display system, comprising the head-up display glass and an image generation device, the image generation device is installed in the vehicle interior and faces the imaging module in the head-up display glass, the image generation device is connected with the vehicle host, and is used for receiving the signal of the vehicle host and generating an image according to the signal of the vehicle host.

[0012] In a third aspect, the application provides a vehicle, comprising the head-up display system.

[0013] In a fourth aspect, the application provides a design method of a head-up display glass, comprising the following steps: step 1: collecting historical solar radiation data of each region, wherein the solar radiation data comprises the solar elevation angle at each target time; step 2: confirming a high incidence period of sunlight backflow based on the historical solar radiation data, and extracting the solar radiation data of the high incidence period of sunlight backflow to obtain test data, wherein the test data comprises a solar elevation angle variation range; step 3: obtaining the imaging angles of an image generation device and an eyebox of a current test vehicle, and constructing a plurality of groups of to-be-tested imaging modules in simulation software according to the imaging angles of the image generation device and the eyebox, wherein the structures of the plurality of groups of to-be-tested imaging modules are different; step 4: setting an initial sunlight incidence angle in the simulation software, generating a plurality of groups of incidence sunlight angles based on the solar elevation angle variation range data in step 2, and respectively performing simulation tests on the plurality of groups of to-be-tested imaging modules according to the plurality of groups of incidence sunlight angles, observing the deflection angle range that each group of imaging modules can achieve, and confirming at least one preferred imaging module, wherein the deflection angle range is the range of the incidence sunlight angle at which the imaging module plays a role of reflection and diffraction on sunlight; and step 5: verifying whether the deflection angle range of the structure of one or more preferred imaging modules in step 4 meets the design requirements, calculating the loss of clarity of the one or more preferred imaging modules on the front windshield, and finally determining the best imaging module according to the calculation result, wherein the final determination standard is that the loss of clarity is within a preset threshold range and can meet the design requirements.

[0014] The head-up display glass, system, vehicle and design method thereof have the following beneficial effects:

[0015] The application designs a structure of a plurality of layers of reflection holograms in series as an imaging module, wherein the inner side of the first reflection hologram is used to reflect and diffract the light rays emitted by the image generation device to the glass to converge and form an eyebox region, realize the head-up display function, and the outer side of the first reflection hologram and the outer side of at least one layer of second reflection holograms are used to reflect and diffract the light rays emitted by the sunlight to the outside of the glass, so that the incident light path of the sunlight deviates from the imaging light path of the image generation device to the imaging module to the eyebox, solve the sunlight backflow phenomenon in the head-up display technology, and by designing the incidence angle working range of the outer side of the first reflection hologram and the incidence angle working range of the outer side of each layer of second reflection holograms to be unequal, non-overlapping and continuous, the incidence angle working range of the outer side of the first reflection hologram and the incidence angle working range of the outer side of each layer of second reflection holograms are superimposed, and most of the sunlight is reflected and diffracted to the outside of the glass. The application has the advantages of simple structure, low cost, strong replaceability, and can solve the problem of sunlight backflow in the head-up display of the automobile. BRIEF DESCRIPTION OF DRAWINGS

[0016] For a better understanding of the above-described and other objects, features, and advantages of the present application, reference should be made to the following implementation, which is illustrated in the accompanying drawings. The same reference numerals in different drawings denote the same or similar components. It is to be understood that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the application, for which reference should be made only to the appended claims. Various components in the drawings are not drawn to scale for illustrative clarity.

[0017] Figure 1 A schematic diagram showing the principle of the sunlight backflow phenomenon;

[0018] Figure 2 A schematic diagram showing the structure of a head-up display glass according to an embodiment of the present application;

[0019] Figure 3 A schematic diagram showing a head-up display system according to an embodiment of the present application;

[0020] Figure 4 A schematic diagram showing the optical path of a head-up display system according to an embodiment of the present application;

[0021] Figure 5 A schematic diagram showing the light intensity output of a specific application embodiment of a head-up display glass according to an embodiment of the present application.

[0022] Legend of reference signs:

[0023] 1, imaging module; 11, first reflector hologram; 12, second reflector hologram; 2, eyebox; 3, image generating device. DETAILED DESCRIPTION

[0024] Exemplary embodiments of the present disclosure are described herein with reference to the accompanying drawings, which are meant to be exemplary, not limiting. As such, various changes and modifications can be suggested to one skilled in the art, and it is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims. Also, in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. However, it will be apparent to one skilled in the art that the present disclosure can be practiced without such specific details.

[0025] As used herein, the terms "comprises," "comprising," "includes," "including" and the like are meant to be open-ended. Specifically, the term "comprises" means "includes, but not limited to," and the like. The term "based on" means "based, at least in part, on." The terms "one example embodiment" and "an example embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "a first," "a second," etc. do not require a strict numbering of the objects. The following description can also include other explicit and implicit definitions.

[0026] Figure 1The principle diagram of the sunlight backflow phenomenon is shown, the green light path is the incident light of the image generating device 3 to the glass, and the reflected or reflected diffraction of the glass is along the blue light path to form the eyebox 2. When the sunlight is along the red light path to the glass, the green light path is overlapped with the red light path, which will interfere with the effect of the green light path along the blue light path to the eyebox 2, and the sunlight backflow phenomenon is formed.

[0027] In order to at least partially solve one or more of the above problems and other potential problems, embodiments of the present disclosure propose a head-up display glass, such as Figures 2 to 4 As shown, it comprises a glass body and an imaging module 1; 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 opposite, and the connecting layer is connected between the outer glass plate and the inner glass plate.

[0028] The imaging module 1 is fixedly connected on 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, wherein the connection technology of the imaging module 1 and the glass body is the prior art. Figure 2 As shown, the imaging module 1 comprises a first reflector holographic 11 and at least one second reflector holographic 12 arranged in parallel in sequence along the direction from the inner glass plate to the outer glass plate, preferably, the number of layers of the second reflector holographic 12 is 1-5 layers.

[0029] The incident angle working range of the inner side of the first reflector holographic 11 matches the incident light angle range of the image generating device 3 to the glass, so that the incident light of the image generating device 3 converges to form the eyebox 2 area after the reflection diffraction of the first reflector holographic 11, wherein the incident angle working range of the inner side of the first reflector holographic 11 is the incident angle range of the incident light emitted by the image generating device 3 which can occur reflection diffraction in the first reflector holographic 11, when the incident angle of the incident light emitted by the image generating device 3 is within the incident angle working range of the inner side of the first reflector holographic 11, the incident light emitted by the image generating device 3 will occur reflection diffraction in the first reflector holographic 11 and the reflection diffraction light will be emitted to the eyebox 2 area along the inner side of the glass body, when the incident angle of the incident light emitted by the image generating device 3 is not within the incident angle working range of the inner side of the first reflector holographic 11, the incident light emitted by the image generating device 3 will not occur reflection diffraction in the first reflector holographic 11 and directly transmit through the first reflector holographic 11 to the outside of the glass body. In the preferred embodiment, the diffraction angle range of the inner side of the first reflector holographic 11 is not equal to and has no intersection 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 area, preventing the ghosting phenomenon.

[0030] The incident angle working range outside the first reflector hologram 11 is not equal to the incident angle working range outside the second reflector hologram 12, so that the sunlight rays in the incident angle working range are reflected and diffracted in the corresponding first reflector hologram 11 or second reflector hologram 12 to the outside of the glass body, wherein the incident angle working range outside the first reflector hologram 11 is the incident angle range of the incident light rays of the sunlight that can be reflected and diffracted in the first reflector hologram 11, when the incident angle of the incident light rays of the sunlight is in the incident angle working range outside the first reflector hologram 11, the incident light rays of the sunlight are reflected and diffracted in the first reflector hologram 11 and the reflected and diffracted light rays are shot to the outside of the glass body, when the incident angle of the incident light rays of the sunlight is not in the incident angle working range outside the first reflector hologram 11, the incident light rays of the sunlight directly pass through the first reflector hologram 11 and are shot to the inside of the glass body, the incident angle working range outside the second reflector hologram 12 is the incident angle range of the incident light rays of the sunlight that can be reflected and diffracted in the second reflector hologram 12, when the incident angle of the incident light rays of the sunlight is in the incident angle working range outside the second reflector hologram 12, the incident light rays of the sunlight are reflected and diffracted in the second reflector hologram 12 and the reflected and diffracted light rays are shot to the outside of the glass body, when the incident angle of the incident light rays of the sunlight is not in the incident angle working range outside the second reflector hologram 12, the incident light rays of the sunlight directly pass through the second reflector hologram 12 and are shot to the inside of the glass body.

[0031] Specifically, the incident angle working range outside the first reflector hologram 11 and the incident angle working range outside the second reflector hologram 12 are designed to be unequal. For example, the incident angle working range outside the first reflector hologram 11 is -3.75° to 3.75°, and the incident angle working range outside the second reflector hologram 12 is 3.5° to 11.5°. In the case where the incident angle of the incident sunlight is not within the incident angle working range outside the first reflector hologram 11 but within the incident angle working range outside the second reflector hologram 12, the incident sunlight will directly pass through the first reflector hologram 11 and be reflected and diffracted in the second reflector hologram 12 to the outside of the glass body. Preferably, the incident angle working range of the outer side of the first reflector hologram 11 does not overlap with the incident angle working range of the outer side of the second reflector hologram 12, for example, the incident angle working range of the outer side of the first reflector hologram 11 is -3.75° to 3.75°, and the incident angle working range of the outer side of the second reflector hologram 12 is 4° to 12°; more preferably, the incident angle working range of the outer side of the first reflector hologram 11 is continuous with the incident angle working range of the outer side of the second reflector hologram 12, for example, the incident angle working range of the outer side of the first reflector hologram 11 is -3.75° to 3.75°, and the incident angle working range of the outer side of the second reflector hologram 12 is 4° to 12°. The incident angle working range is 3.75° to 12°; more preferably, the incident angle working range of the outer side of the first reflector hologram 11 is equal to the incident angle working range of the outer side of the second reflector hologram 12, for example, the incident angle working range of the outer side of the first reflector hologram 11 is -3.75° to 3.75°, and the incident angle working range of the outer side of the second reflector hologram 12 is 3.75° to 11.25°, and the incident angle working range is both 7.5°, so that the device of the present application can reflect and diffract the incident light of sunlight with an incident angle range of -3.75° to 11.25° to the outside of the glass body.

[0032] Figure 4 This is a schematic diagram of the optical path of the head-up display glass of this application when it is in effect, θ1 is the incident angle of the incident sunlight, θ2 is the diffraction angle of the incident sunlight reflected and diffracted by the imaging module 1 in this application, θ3 is the angle between the light emitted by the image generating device 3 and the horizontal axis of the vehicle coordinate system, the dotted line represents the optical path of the light emitted by the image generating device 3 to the imaging module 1, which is reflected and diffracted to the eye box 2 area, and the solid line represents the incident sunlight to the imaging module 1, which is reflected and diffracted to the outside of the glass body.

[0033] In a preferred embodiment, if Figure 2As shown, the second reflector hologram 12 is provided with multiple layers, and the incident angle working ranges of the outer sides of the multiple layers of the second reflector hologram 12 are not equal, and the incident angle working range of the outer side of each layer of the second reflector hologram 12 is not equal to the incident angle working range of the outer side of the first reflector hologram 11. For example, the second reflector hologram 12 is provided with two layers, and the incident angle working range of the outer side of the first reflector hologram 11 is -3.75° to 3.75°, the incident angle working range of the outer side of the second reflector hologram 12 of the first layer is 3.5° to 12°, and the incident angle working range of the outer side of the second reflector hologram 12 of the second layer is 11° to 20°. Preferably, , the incident angle working ranges of the outer sides of the multi-layer second reflector holograms 12 do not overlap, and the incident angle working range of the outer side of each layer of the second reflector hologram 12 does not overlap with the incident angle working range of the outer side of the first reflector hologram 11. For example, the second reflector hologram 12 is provided with two layers, the incident angle working range of the outer side of the first reflector hologram 11 is -3.75° to 3.75°, the incident angle working range of the outer side of the second reflector hologram 12 of the first layer is 4° to 12°, and the incident angle working range of the outer side of the second reflector hologram 12 of the second layer is 13° to 20°; more preferably, the incident angle of the outer side of the multi-layer second reflector hologram 12 The incident angle working range of the second reflector hologram 11 is continuous with the incident angle working range of the outer side of the first reflector hologram 11. For example, the second reflector hologram 12 is provided with two layers. The incident angle working range of the outer side of the first reflector hologram 11 is -3.75° to 3.75°. The incident angle working range of the outer side of the second reflector hologram 12 of the first layer is 3.75° to 12°. The incident angle working range of the outer side of the second reflector hologram 12 of the second layer is 12° to 20°. More preferably, the incident angle working ranges of the outer sides of the multi-layer second reflector holograms 12 are equal in size, and the incident angle working range of the outer side of the first reflector hologram 11 is equal to that of the second reflector hologram 11. 2. For example, the second reflector hologram 12 is provided with two layers. The incident angle working range of the first reflector hologram 11 is -3.75° to 3.75°. The incident angle working range of the second reflector hologram 12 of the first layer is 3.75° to 11.25°. The incident angle working range of the second reflector hologram 12 of the second layer is 11.25° to 18.75°. The incident angle working range is 7.5°. Therefore, the device of the present application can reflect and diffract the incident light of sunlight with an incident angle range of -3.75° to 18.75° to the outside of the glass body.

[0034] In a specific embodiment, the second reflective volume hologram 12 has one layer, and the imaging module 1 has two layers. The thickness of the two layers of reflective volume holograms is 50 microns. The angle selectivity and diffraction efficiency curves are as follows: Figure 5As shown, the incident angle range of each layer of reflector hologram is 7.5, wherein the incident angle working range of the outer side of the first reflector hologram 11 is -3.75° to 3.75°, and the incident angle working range of the outer side of the second reflector hologram 12 is 3.75° to 11.25°. The imaging module 1 can reflect and diffract the incident light of sunlight with an incident angle range of -3.75° to 11.25° to the outside of the glass body. The maximum deflection angle of the imaging module 1 is 15°, and the maximum efficiency is 80% + 80% × 20% = 96%.

[0035] In a specific embodiment, the second reflective volume hologram 12 has two layers, and the imaging module 1 has three layers. The thickness of the two layers of reflective volume hologram is 50 microns. The angle selectivity and diffraction efficiency curves are as follows: Figure 5 As shown, the incident angle range of each layer of reflector hologram is 7.5, wherein the incident angle working range of the outer side of the first reflector hologram 11 is -3.75° to 3.75°, the incident angle working range of the outer side of the second reflector hologram 12 of the first layer is 3.75° to 11.25°, and the incident angle working range of the outer side of the second reflector hologram 12 of the second layer is 11.25° to 18.75°. The imaging module 1 can reflect and diffract the incident light of sunlight with an incident angle range of -3.75° to 18.75° to the outside of the glass body. The maximum deflection angle of the imaging module 1 is 22.5°, and the maximum efficiency is 80%+80%×20%+80%×20%×20%=99.2%.

[0036] This application also provides a head-up display system, such as Figures 2 to 4 As shown, the head-up display glass includes any of the above-described ones and an image generating device 3. 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 computer to receive signals from the vehicle host computer and generate images based on the signals from the vehicle host computer. Preferably, the image generating device 3 includes a thin film transistor, a digital light processor, a silicon liquid crystal, and a laser beam scanner.

[0037] The present application also provides a vehicle, comprising the above-mentioned head-up display system.

[0038] This application also provides a design method for head-up display glass, comprising the following steps:

[0039] Step 1: Collect historical solar radiation data for each region, where the solar radiation data includes the solar altitude angle at each target time.

[0040] Step 2: Based on historical solar radiation data, identify periods of high incidence of sun backflow and extract solar radiation data from these periods to obtain test data. The test data includes a range of solar altitude angle variations. The solar altitude angle variation range defines the range within which sunlight incident angles can overlap with the imaging optical path of the head-up display, thereby causing sun backflow. For example, based on historical solar radiation data for the Beijing area, it can be found that sun backflow is more likely to occur from June to August. Therefore, based on July 1st in that area, the solar altitude angle at 10:00 AM is 60°, the solar altitude angle at 12:00 PM is 74°, and the solar altitude angle at 2:00 PM is 60°. Therefore, the solar altitude angle variation range is 28°.

[0041] Step 3: Obtain the imaging angles of the image generating device and the eye box under the current test vehicle model, and construct multiple groups of imaging modules to be tested in the simulation software according to the imaging angles of the image generating device and the eye box, wherein the structures of the multiple groups of imaging modules to be tested are different. Specifically, the multiple groups of imaging modules to be tested are constructed by controlling the number of layers of the second reflector hologram, the operating range of the incident angle outside the first reflector hologram, and the operating range of the incident angle outside each layer of the second reflector hologram. For example, three groups of imaging modules to be tested are constructed. The structure of the first group of imaging modules to be tested is a layer of first reflector hologram and a layer of second reflector hologram, the incident angle working range of the outer side of the first reflector hologram is a to b, and the incident angle working range of the second reflector hologram is b to c; the structure of the second group of imaging modules to be tested is a layer of first reflector hologram and two layers of second reflector holograms, the incident angle working range of the outer side of the first reflector hologram is a to d, the incident angle working range of the second reflector hologram in the first layer is d to e, and the incident angle working range of the second reflector hologram in the second layer is e to f; the structure of the third group of imaging modules to be tested is a layer of first reflector hologram and two layers of second reflector holograms, the incident angle working range of the outer side of the first reflector hologram is a to g, the incident angle working range of the second reflector hologram in the first layer is g to h, and the incident angle working range of the second reflector hologram in the second layer is h to j.

[0042] Step 4: Set the initial sunlight incident angle in the simulation software, generate multiple groups of incident sunlight angles based on the solar altitude angle variation range data in step 2, and perform simulation tests on multiple groups of imaging modules to be tested according to the multiple groups of incident sunlight angles. Observe the deflection angle range that can be achieved by each group of imaging modules to confirm at least one preferred imaging module, where the deflection angle range is the range of incident sunlight angles at which the imaging module reflects and diffracts sunlight.

[0043] Step 5: verifying whether the deflection angle range of the structure of one or more preferred imaging modules in step 4 meets the design requirements, while calculating the loss of clarity of the front windshield of the one or more preferred imaging modules, and finally determining the optimal imaging module according to the calculation results, wherein the final determination standard is that the loss of clarity is within a preset threshold range and can meet the design requirements.

[0044] In the preferred embodiment, step 6 is further included: making the head-up display glass with the optimal imaging module obtained in step 5 and installing it on a test vehicle for real vehicle testing, observing whether the image generation device and the optical device are damaged during the real vehicle testing, if not, it means that the optimal imaging module obtained in step 5 is reasonable in design, if yes, it means that the optimal imaging module obtained in step 5 needs to be further optimized. Step 7: recording the specific sunlight incident angle when the damage occurs. Specifically, the sunlight incident angle when the damage occurs can be captured by using a light sensor on the vehicle, a second reflector hologram is designed according to the range of the specific sunlight incident angle, and the second reflector hologram is added to the optimal imaging module obtained in step 5 to update the optimal imaging module.

[0045] The above has described various embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical applications, or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand this article.

Claims

1. A head-up display glass, characterized by: 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 to and opposite to each other. The connecting layer is connected between the outer glass plate and the inner glass plate. The imaging module (1) is fixedly connected to the glass body; the imaging module (1) comprises a first reflector hologram (11) and at least one second reflector hologram (12) arranged in sequence along the direction from the inner glass plate to the outer glass plate; the incident angle working range inside the first reflector hologram (11) matches the incident light angle range of the image generating device (3) toward the glass, so that the incident light of the image generating device (3) is reflected and diffracted by the first reflector hologram (11) and converged to form an eye box (2) area; the incident angle working range outside the first reflector hologram (11) is not equal to the incident angle working range outside the second reflector hologram (12), so that sunlight within the incident angle working range is reflected and diffracted in the corresponding first reflector hologram (11) or the second reflector hologram (12) to the outside of the glass body.

2. The head-up display glass according to claim 1, characterized in that: The second reflector hologram (12) is provided with multiple layers, and the incident angle working ranges of the outer sides of the multiple layers of the second reflector hologram (12) are not equal, and the incident angle working range of the outer side of each layer of the second reflector hologram (12) is not equal to the incident angle working range of the outer side of the first reflector hologram (11).

3. The head-up display glass according to claim 2, characterized in that: The incident angle working ranges of the outer sides of the multiple layers of the second reflector hologram (12) do not overlap, and the incident angle working range of the outer side of each layer of the second reflector hologram (12) does not overlap with the incident angle working range of the outer side of the first reflector hologram (11).

4. The head-up display glass according to claim 3, characterized in that: The incident angle working range outside the multi-layer second reflector hologram (12) is continuous with the incident angle working range outside the first reflector hologram (11).

5. The head-up display glass according to claim 2, characterized in that: The incident angle working ranges outside the multi-layer second reflector hologram (12) are equal in size.

6. The head-up display glass according to claim 1 or 2, characterized in that: The incident angle working range outside the first reflector hologram (11) is equal to the incident angle working range outside the second reflector hologram (12).

7. The 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 invention comprises a head-up display glass and an image generating device (3) as described in any one of claims 1 to 7, wherein the image generating device (3) is installed inside a vehicle and faces an imaging module (1) in the head-up display glass, and the image generating device (3) is connected to a vehicle host and is used to receive a signal from the vehicle host and generate an image according to the signal from the vehicle host.

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

10. A design method for head-up display glass, used for the head-up display glass according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Collect historical solar radiation data for each region, where the solar radiation data includes the sun's altitude angle at each target time; Step 2: Based on the historical solar radiation data, identify the period of high incidence of solar backflow, and extract the solar radiation data during the period of high incidence of solar backflow to obtain test data, where the test data includes the range of solar altitude angle variation; Step 3: Obtain the imaging angles of the image generation device and the eye box of the current test vehicle model, and construct multiple sets of imaging modules to be tested in the simulation software based on the imaging angles of the image generation device and the eye box, where the structures of the multiple sets of imaging modules to be tested are different; Step 4: Set the initial sunlight incident angle in the simulation software, generate multiple sets of incident sunlight angles based on the solar altitude angle variation range data in Step 2, and perform simulation tests on multiple sets of imaging modules to be tested based on the multiple sets of incident sunlight angles. Observe the deflection angle range that can be achieved by each imaging module to identify at least one optimal imaging module, where the deflection angle range is the range of incident sunlight angles within which the imaging module reflects and diffracts sunlight. Step 5: Verify whether the deflection angle range of the structure of one or more preferred imaging modules in step 4 meets the design requirements, and calculate the clarity loss of one or more preferred imaging modules on the front windshield. Finally, determine the optimal imaging module based on the calculation results, where the final determination standard is that the clarity loss is within a preset threshold range and can meet the design requirements.

Images