Light path adjusting device, head-up display for vehicle and vehicle
By simulating the length of the optical path by using the scaling characteristics of the optical lens, the existing head-up display has solved the problem of large size and complex design caused by the use of two reflectors, and miniaturization and optimization of display effects have been achieved.
Patent Information
- Application Number
- CN202311500994.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-13
- Publication Date
- 2025-05-13
AI Technical Summary
The existing head-up display requires the design of the optical path with the help of two reflectors, which makes the device large and complex design difficult to achieve miniaturization.
The scaling characteristics of optical lenses are used to simulate the length of the optical path, and the optical path adjustment is achieved by setting lens components with different scaling coefficients, reducing the volume requirement for the head-up display.
The size reduction and display effect optimization of the head-up display are achieved, and the appropriate zoom can be performed according to the needs of different images to improve the display effect.
Smart Images
Figure CN119986996A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of vehicles, and more specifically, to an optical path adjustment device, a head-up display for a vehicle including the optical path adjustment device, and a vehicle including the optical path adjustment device or including the head-up display for a vehicle. Background Art
[0002] Generally speaking, the head-up display is placed inside the instrument panel, below the windshield. The head-up display projects information such as vehicle speed and navigation onto the windshield. In this way, the driver can see driving information without lowering his head, improving driving safety.
[0003] The images displayed by conventional head-up displays are at a fixed distance from the human eye. However, as the level of automobile intelligence increases, head-up displays must display both dynamic augmented reality images at longer distances, such as navigation and vehicles ahead, and static images at closer distances, such as vehicle speed and battery level.
[0004] Figure 1 FIG. 2 shows a schematic diagram of an optical path adjustment device according to the prior art. Figure 1 As shown, a portion of the light from the image light source 101 of the head-up display 100 is reflected by the reflector 102 to the curved mirror 104 and then reflected to a higher position of the windshield 500, and then enters the human eye 300 after being reflected by the windshield 500, and the human eye 300 sees a virtual image 106. Since the reflection path from the light source 101 is long, the virtual image 106 formed is far away from the human eye. Another portion of the light from the image light source 101 of the head-up display 100 is reflected by the reflector 103 to the curved mirror 104 and then reflected to a lower position of the windshield 500, and then enters the human eye 300 after being reflected by the windshield 500, and the human eye 300 sees a virtual image 105. Since the reflection path from the image light source 101 is short, the virtual image 105 formed is close to the human eye.
[0005] The virtual images 105 and 106 have different projection distances based on the different light paths achieved by the two reflectors 102 and 103. The two reflectors 102 and 103 not only increase the volume of the head-up display, but also complicate the light path design, increasing the difficulty of head-up display design. Summary of the invention
[0006] In order to solve the above problem, the existing head-up display needs to use two reflectors to design the optical path, which is not conducive to the miniaturization of the head-up display. The inventor of the present disclosure innovatively thought that it is not necessary to use two reflectors, but to use the zoom characteristics of optical lenses to simulate the length of the optical path, and then use the zoom characteristics of optical lenses to achieve the presentation of the target object. In this way, the volume of the head-up display according to the present disclosure can be reduced, and the display effect of the head-up display according to the present disclosure can also be optimized.
[0007] Based on this, the first aspect of the present disclosure proposes an optical path adjustment device, the optical path adjustment device comprising:
[0008] An image light source, the image light source having a first image area and a second image area, wherein an image of the first image area is presented in a first imaging area of the vehicle glass via a first optical path, and wherein an image of the second image area is presented in a second imaging area of the vehicle glass via a second optical path;
[0009] a first lens assembly disposed in the first optical path; and
[0010] a second lens assembly disposed in the second optical path,
[0011] Wherein, the scaling factor of the first lens assembly is different from the scaling factor of the second lens assembly.
[0012] In the optical path adjustment device proposed according to the present disclosure, the zoom factor of the first lens assembly is different from the zoom factor of the second lens assembly, so that the optical path of the first optical path and the second optical path are different, and thus the zoom factors of the images presented by the first imaging area and the second imaging area are also different. In this way, the difference between the zoom factor of the first lens assembly and the zoom factor of the second lens assembly can be used to achieve different zoom requirements of the head-up display for different images, thereby optimizing the display effect of the head-up display according to the present disclosure.
[0013] In one embodiment of the present disclosure, the first lens assembly and the second lens assembly include a curved reflector, which is used to reflect light emitted from the first image area to the first imaging area, and to reflect light emitted from the second image area to the second imaging area. By means of the curved reflector according to the present disclosure, light incident from different directions can be reflected onto the windshield, thereby better optimizing the display effect of the head-up display according to the present disclosure.
[0014] In one embodiment according to the present disclosure, the first lens assembly and the second lens assembly further include a plane reflector, and the plane reflector is used to reflect the light emitted through the first image area and the light emitted through the second image area to the curved reflector.
[0015] In one embodiment according to the present disclosure, the first lens assembly includes a first Fresnel prism. Preferably, in one embodiment according to the present disclosure, the second lens assembly includes the second Fresnel prism and a third Fresnel prism, wherein the second Fresnel prism and the third Fresnel prism have complementary structures. More preferably, in one embodiment according to the present disclosure, the first Fresnel prism and the second Fresnel prism have the same physical structure. Further preferably, in one embodiment according to the present disclosure, the first Fresnel prism and the second Fresnel prism are integrally formed.
[0016] Optionally, in one embodiment according to the present disclosure, the zoom factor of the first Fresnel prism is greater than one and the zoom factor of the combined prism formed by the second Fresnel prism and the third Fresnel prism is one, or the zoom factor of the first Fresnel prism is greater than the zoom factor of the combined prism. Alternatively, in one embodiment according to the present disclosure, the zoom factor of the first lens assembly and the zoom factor of the second lens assembly are both greater than one.
[0017] Optionally, in one embodiment according to the present disclosure, the first lens assembly and the second lens assembly include a common holographic optical element, and a first scaling factor of a first portion of the holographic optical element on the first optical path is different from a second scaling factor of a second portion of the holographic optical element on the second optical path. Preferably, in one embodiment according to the present disclosure, one of the first scaling factor and the second scaling factor is equal to one.
[0018] Optionally, in one embodiment according to the present disclosure, the first imaging area is used to display dynamic images. Optionally, in one embodiment according to the present disclosure, the second imaging area is used to display static images. Preferably, in one embodiment according to the present disclosure, the first imaging area and the second imaging area are independent of each other in position.
[0019] In addition, a second aspect of the present disclosure proposes a head-up display for a vehicle, characterized in that the head-up display includes the optical path adjustment device proposed according to the first aspect of the present disclosure.
[0020] Furthermore, a third aspect of the present disclosure proposes a vehicle, which includes the optical path adjustment device proposed according to the first aspect of the present disclosure or the head-up display for the vehicle proposed according to the second aspect of the present disclosure.
[0021] In one embodiment according to the present disclosure, the vehicle-mounted glass includes a windshield of a vehicle.
[0022] In summary, in the optical path adjustment device proposed according to the present disclosure, the zoom factor of the first lens assembly is different from the zoom factor of the second lens assembly, so that the optical path of the first optical path and the second optical path are different, and thus the zoom factors of the images presented by the first imaging area and the second imaging area are also different. In this way, the difference between the zoom factor of the first lens assembly and the zoom factor of the second lens assembly can be used to achieve different zoom requirements of the head-up display for different images, thereby optimizing the display effect of the head-up display according to the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The features, advantages and other aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings, in which several embodiments of the present disclosure are shown in an exemplary and non-limiting manner. In the accompanying drawings:
[0024] Figure 1 A schematic diagram of an optical path adjustment device according to the prior art is shown;
[0025] Figure 2 A schematic diagram of an optical path adjustment device according to an embodiment of the present disclosure is shown;
[0026] Figure 3 A schematic diagram of a lens assembly according to an embodiment of the present disclosure is shown;
[0027] Figure 4 A schematic diagram showing an optical path adjustment device according to another embodiment of the present disclosure; and
[0028] Figure 5 A schematic diagram of a lens assembly according to another embodiment of the present disclosure is shown. DETAILED DESCRIPTION
[0029] The various exemplary embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. Although the exemplary methods and devices described below include software and / or firmware executed on hardware among other components, it should be noted that these examples are merely illustrative and should not be considered restrictive. For example, it is considered that any or all hardware, software, and firmware components can be implemented exclusively in hardware, exclusively in software, or in any combination of hardware and software. Therefore, although exemplary methods and devices have been described below, it should be readily understood by those skilled in the art that the examples provided are not intended to limit the manner in which these methods and devices are implemented.
[0030] In addition, the flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the methods and systems according to the various embodiments of the present disclosure. It should be noted that the functions marked in the boxes may also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession may actually be executed substantially in parallel, or they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the flowchart and / or block diagram, and the combination of boxes in the flowchart and / or block diagram, may be implemented using a dedicated hardware-based system that performs a specified function or operation, or may be implemented using a combination of dedicated hardware and computer instructions.
[0031] The terms "including", "comprising" and similar terms used herein are open terms, i.e., "including / including but not limited to", indicating that other contents may also be included. The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment", etc.
[0032] As mentioned above, the head-up display in the prior art needs to use two reflectors to design the optical path, which is not conducive to the miniaturization of the head-up display. In order to solve the above problem, the inventor of the present disclosure innovatively thought that it is not necessary to use two reflectors, but to use the zoom characteristics of optical lenses to simulate the length of the optical path, and then use the zoom characteristics of optical lenses to achieve the presentation of the target object. In this way, the volume of the head-up display according to the present disclosure can be reduced, and the display effect of the head-up display according to the present disclosure can also be optimized.
[0033] In summary, the present disclosure proposes an optical path adjustment device, the optical path adjustment device comprising: an image light source, the image light source having a first image area and a second image area, wherein the image of the first image area is presented in a first imaging area of the vehicle glass via a first optical path, and wherein the image of the second image area is presented in a second imaging area of the vehicle glass via a second optical path; a first lens assembly arranged in the first optical path; and a second lens assembly arranged in the second optical path, wherein the zoom factor of the first lens assembly is different from the zoom factor of the second lens assembly. In the optical path adjustment device proposed according to the present disclosure, the zoom factor of the first lens assembly is different from the zoom factor of the second lens assembly, so that the optical path of the first optical path and the second optical path are different, and thus the zoom factors of the images presented by the first imaging area and the second imaging area are also different. In this way, the difference between the zoom factor of the first lens assembly and the zoom factor of the second lens assembly can be used to realize the different zoom requirements of the head-up display for different images, thereby optimizing the display effect of the head-up display according to the present disclosure.
[0034] The following will describe the optical path adjustment device and the corresponding head-up display according to the present disclosure in conjunction with the accompanying drawings. Figure 2 A schematic diagram of an optical path adjustment device according to an embodiment of the present disclosure is shown. Figure 3 A schematic diagram of a lens assembly according to an embodiment of the present disclosure is shown, Figure 4 FIG. 2 shows a schematic diagram of an optical path adjustment device according to another embodiment of the present disclosure. Figure 5 A schematic diagram of a lens assembly according to another embodiment of the present disclosure is shown.
[0035] Specifically, Figure 2 FIG. 1 is a schematic diagram of an optical path adjustment device according to an embodiment of the present disclosure. Figure 2 It can be seen that the head-up display 200 according to the present disclosure is composed of a reflector 202, a curved mirror 204, a Fresnel prism 203 and a Fresnel prism 207. The Fresnel prism 203 has an image zooming function, and the Fresnel prism 207 has an image reduction function. Here, those skilled in the art should understand that the reflector 202 is not necessary. For example, the emitted light of the image light source 201 can directly hit the curved reflector 204, as long as it can be guided to the windshield 500 for display.
[0036] Here, part of the light from the image light source 201 of the head-up display 200 is reflected by the reflector 202 to the curved mirror 204, which scales the image for the first time, and then scales the image for the second time when passing through the Fresnel prism 203, and finally reflects to the windshield 500, enters the human eye 300 after being reflected by the windshield 500, and the human eye 300 sees the virtual image 206; while another part of the light from the image light source 201 of the head-up display 200 is reflected by the reflector 202 to the curved mirror 204, which scales the image for the first time, and then scales the image for the second time when passing through the Fresnel prism 203, but further scales the image, for example, reduces it, when passing through the Fresnel prism 207, and finally reflects to the windshield 500, enters the human eye 300 after being reflected by the windshield 500, and the human eye 300 sees the virtual image 205. Since the virtual image 205 has a smaller magnification than the virtual image 206 , the projection distance of the virtual image 205 is smaller than the projection distance of the virtual image 206 , so the human eye 300 feels that the virtual image 205 is closer to the human eye.
[0037] Figure 3 Schematic diagram of a lens assembly according to an embodiment of the present disclosure is shown. Figure 3 As shown, the Fresnel prism 203 and the Fresnel prism 207 have the same prism angle and prism size. When the Fresnel prism 203 and the Fresnel prism 207 are bonded together by the optical glue 208, the bonding area loses the function of zooming in and out of the image. In the optical path adjustment device proposed according to the present disclosure, the optical path adjustment device can realize the display of double-layer projection distance without increasing the volume.
[0038] In addition to the above-mentioned technical solution implemented by a two-layer Fresnel prism, it can also be implemented by means of a holographic optical element, for example. Figure 4 FIG. 2 is a schematic diagram of an optical path adjustment device according to another embodiment of the present disclosure. Figure 4As shown, a head-up display 400 according to the present disclosure is composed of a reflector 402, a curved mirror 404 and a holographic optical element 403. The holographic optical element 403 has a zooming function at a local position, and has no zooming function at a local position. A portion of the light from the image light source 401 of the head-up display 400 is reflected by the reflector 402 to the curved mirror 404, which performs a first scaling on the image, and then, when passing through the position of the holographic optical element 403 having a scaling effect, performs a second scaling on the image, and finally, is reflected to the windshield 500, enters the human eye 300 after being reflected by the windshield 500, and the human eye 300 sees a virtual image 406; while another portion of the light from the image light source 401 of the head-up display 401 is reflected by the reflector 402 to the curved mirror 404, which performs a first scaling on the image, and then, when passing through the position of the holographic optical element 403 having no scaling effect, is finally reflected to the windshield 500, enters the human eye 300 after being reflected by the windshield 500, and the human eye 300 sees a virtual image 405. Since the virtual image 405 has a smaller magnification than the virtual image 406, the projection distance of the virtual image 405 is smaller than the projection distance of the virtual image 406, so the human eye 300 feels that the virtual image 405 is closer to the human eye. Here, those skilled in the art should understand that the reflector 402 is not necessary. For example, the emitted light of the image light source 401 can directly hit the curved reflector 404, as long as it can be guided to the windshield 500 for display.
[0039] Figure 5 FIG. 2 shows a schematic diagram of a lens assembly according to another embodiment of the present disclosure. Figure 5 As shown, the holographic optical element 403 is composed of a region 408 with a zoom function and a region 407 without a zoom function. The zoom function of the holographic optical element is due to the fact that when recording a hologram, at least one of the recorded light waves is a spherical surface or an aspherical surface, so that the holographic optical element has an optical focal length. When the light wave is shielded by a light shielding plate and the hologram is not recorded in the region 407, the region 407 does not have the image zoom function.
[0040] In one embodiment of the present disclosure, the first lens assembly and the second lens assembly include a curved reflector, which is used to reflect light emitted from the first image area to the first imaging area, and to reflect light emitted from the second image area to the second imaging area. By means of the curved reflector according to the present disclosure, light incident from different directions can be reflected onto the windshield, thereby better optimizing the display effect of the head-up display according to the present disclosure.
[0041] In one embodiment according to the present disclosure, the first lens assembly and the second lens assembly further include a plane reflector, and the plane reflector is used to reflect the light emitted through the first image area and the light emitted through the second image area to the curved reflector.
[0042] In one embodiment according to the present disclosure, the first lens assembly includes a first Fresnel prism. Preferably, in one embodiment according to the present disclosure, the second lens assembly includes the second Fresnel prism and a third Fresnel prism, wherein the second Fresnel prism and the third Fresnel prism have complementary structures. More preferably, in one embodiment according to the present disclosure, the first Fresnel prism and the second Fresnel prism have the same physical structure. Further preferably, in one embodiment according to the present disclosure, the first Fresnel prism and the second Fresnel prism are integrally formed.
[0043] Optionally, in one embodiment according to the present disclosure, the zoom factor of the first Fresnel prism is greater than one and the zoom factor of the combined prism formed by the second Fresnel prism and the third Fresnel prism is one, or the zoom factor of the first Fresnel prism is greater than the zoom factor of the combined prism. Alternatively, in one embodiment according to the present disclosure, the zoom factor of the first lens assembly and the zoom factor of the second lens assembly are both greater than one.
[0044] Optionally, in one embodiment according to the present disclosure, the first lens assembly and the second lens assembly include a common holographic optical element, and a first scaling factor of a first portion of the holographic optical element on the first optical path is different from a second scaling factor of a second portion of the holographic optical element on the second optical path. Preferably, in one embodiment according to the present disclosure, one of the first scaling factor and the second scaling factor is equal to one.
[0045] Optionally, in one embodiment according to the present disclosure, the first imaging area is used to display dynamic images. Optionally, in one embodiment according to the present disclosure, the second imaging area is used to display static images. Preferably, in one embodiment according to the present disclosure, the first imaging area and the second imaging area are independent of each other in position.
[0046] In addition, a second aspect of the present disclosure proposes a head-up display for a vehicle, characterized in that the head-up display includes the optical path adjustment device proposed according to the first aspect of the present disclosure.
[0047] Furthermore, a third aspect of the present disclosure proposes a vehicle, which includes the optical path adjustment device proposed according to the first aspect of the present disclosure or the head-up display for the vehicle proposed according to the second aspect of the present disclosure.
[0048] In one embodiment according to the present disclosure, the vehicle-mounted glass includes a windshield of a vehicle.
[0049] As can be seen from the above discussion, the internal structure and optical design of the head-up display according to the present disclosure are simple and small in size. It uses a membrane with a zooming function, such as a Fresnel prism or a holographic optical element, to change its zoom ratio in a specific area of the membrane to achieve a change in the light projection distance, so that the image projected by the head-up display has different projection distances at the same time. Here, the present disclosure can also be applied to other membranes or lenses with zooming or reducing functions, and it is only necessary to transform the structure of zooming or reducing the image in the local area on the membrane into a structure without zooming or reducing.
[0050] In summary, in the optical path adjustment device proposed according to the present disclosure, the zoom factor of the first lens assembly is different from the zoom factor of the second lens assembly, so that the optical path of the first optical path and the second optical path are different, and thus the zoom factors of the images presented by the first imaging area and the second imaging area are also different. In this way, the difference between the zoom factor of the first lens assembly and the zoom factor of the second lens assembly can be used to achieve different zoom requirements of the head-up display for different images, thereby optimizing the display effect of the head-up display according to the present disclosure.
[0051] Although the embodiments of the present disclosure have been described with reference to several specific embodiments, it should be understood that the embodiments of the present disclosure are not limited to the specific embodiments disclosed. The embodiments of the present disclosure are intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims. The scope of the claims is consistent with the broadest interpretation, thereby including all such modifications and equivalent structures and functions.
Claims
1. An optical path adjustment device, characterized in that: The optical path adjustment device comprises: An image light source, the image light source having a first image area and a second image area, wherein an image of the first image area is presented in a first imaging area of the vehicle glass via a first optical path, and wherein an image of the second image area is presented in a second imaging area of the vehicle glass via a second optical path; a first lens assembly disposed in the first optical path; and a second lens assembly disposed in the second optical path, Wherein, the scaling factor of the first lens assembly is different from the scaling factor of the second lens assembly.
2. The optical path adjustment device according to claim 1, characterized in that: The first lens assembly and the second lens assembly include a curved reflector, and the curved reflector is used to reflect the light emitted through the first image area to the first imaging area, and to reflect the light emitted through the second image area to the second imaging area.
3. The optical path adjustment device according to claim 2, characterized in that: The first lens assembly and the second lens assembly further include a plane reflector, and the plane reflector is used to reflect the light emitted through the first image area and the light emitted through the second image area to the curved reflector.
4. The optical path adjustment device according to any one of claims 1 to 3, characterized in that: The first lens assembly includes a first Fresnel prism.
5. The optical path adjustment device according to claim 4, characterized in that: The second lens assembly includes the second Fresnel prism and a third Fresnel prism, wherein the second Fresnel prism and the third Fresnel prism have complementary structures.
6. The optical path adjustment device according to claim 5, characterized in that: The first Fresnel prism and the second Fresnel prism have the same physical structure.
7. The optical path adjustment device according to claim 6, characterized in that: The first Fresnel prism and the second Fresnel prism are integrally formed.
8. The optical path adjustment device according to claim 5, characterized in that: The scaling factor of the first Fresnel prism is greater than one and the scaling factor of the combined prism formed by the second Fresnel prism and the third Fresnel prism is one, or the scaling factor of the first Fresnel prism is greater than the scaling factor of the combined prism.
9. The optical path adjustment device according to claim 1, characterized in that: The zoom factor of the first lens assembly and the zoom factor of the second lens assembly are both greater than one.
10. The optical path adjustment device according to claim 1, characterized in that: The first lens assembly and the second lens assembly include a common holographic optical element, and a first zoom factor of a first portion of the holographic optical element on the first optical path is different from a second zoom factor of a second portion of the holographic optical element on the second optical path.
11. The optical path adjustment device according to claim 10, characterized in that: One of the first scaling factor and the second scaling factor is equal to one.
12. The optical path adjustment device according to claim 1, characterized in that: The first imaging area is used to display dynamic images.
13. The optical path adjustment device according to claim 12, characterized in that: The second imaging area is used to display a static image.
14. The optical path adjustment device according to claim 1, characterized in that: The first imaging area and the second imaging area are independent of each other in position.
15. A head-up display for a vehicle, characterized in that: The head-up display comprises the optical path adjustment device according to any one of claims 1 to 14.
16. A vehicle, characterized in that: The vehicle includes the optical path adjusting device according to claims 1 to 14 or the head-up display for a vehicle according to claim 15 .
17. The vehicle according to claim 16, characterized in that The vehicle-mounted glass includes a front windshield of the vehicle.