Oblique projection optical structure suitable for head-up display system

Abstract

The utility model discloses an oblique projection optical structure suitable for a head-up display system, which comprises a PGU image source and an eye box, the PGU image source is used for outputting displayed images, and the eye box is used for receiving the images output by the PGU image source; the device comprises a first reflector, a second reflector and a windshield, the first reflector and the second reflector are arranged on a light path of a PGU image source, the first reflector is used for carrying out first reflection on light emitted by the PGU image source, the second reflector is used for carrying out second reflection on the light reflected by the first reflector, and the windshield is arranged on the light path of the PGU image source. And the windshield is used for reflecting the light reflected by the second reflector to the eye box. According to the oblique projection optical structure suitable for the head-up display system provided by the utility model, virtual images at different angles can be obtained by changing the rotation angle of the PGU image source, the continuous adjustment of the included angle between the virtual image and the ground can be realized, the depth-of-field variation range can be expanded, and the oblique projection optical structure suitable for the head-up display system is adapted to different types of HUDs and meets the use requirements of different users.

Description

Technical Field

[0001] This utility model relates to the field of head-up display technology, and in particular to an oblique projection optical structure suitable for head-up display systems. Background Technology

[0002] With the development of science and technology, head-up display (HUD) systems are increasingly being used in automobiles. HUD systems in cars can display important driving information, such as speed, engine RPM, fuel consumption, tire pressure, navigation, and information from connected smart devices, in real time on the windshield within the driver's field of vision. This allows the driver to see driving information without looking down, thus avoiding distraction from the road ahead. It also eliminates the need for the driver to adjust their eyes between looking at the distant road and the nearby instruments, reducing eye fatigue and significantly enhancing driving safety and improving the driving experience.

[0003] Currently, HUDs on the market are all oblique projection solutions, where the tilt angle of the virtual image surface is fixed and cannot be adjusted, making them unsuitable for different user needs. Furthermore, HUDs suffer from poor virtual image surface alignment with the ground and poor integration of the virtual image with the real world. Utility Model Content

[0004] Based on this, it is necessary to provide an oblique projection optical structure suitable for head-up display systems to address the aforementioned technical problems. By adjusting the position of the PGU image source through an angle adjustment component, the virtual image will also change accordingly. Furthermore, by changing the surface shape of the first and second reflectors during the optical design process to adapt to different object-image relationships, virtual images at different angles can be obtained by changing the rotation angle of the PGU image source. This allows for continuous adjustment of the angle between the virtual image and the ground, thereby expanding the depth-of-field variation range of the HUD system.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An oblique projection optical structure suitable for a head-up display system, comprising:

[0007] The PGU image source and the eye box are used to output and display images, and the eye box is used to receive images output by the PGU image source.

[0008] A first reflector, a second reflector, and a windshield are provided. The first and second reflectors are positioned in the optical path of the PGU image source. The first reflector is used to reflect the light emitted from the PGU image source for the first time, and the second reflector is used to reflect the light reflected by the first reflector for the second time. The windshield is used to reflect the light reflected by the second reflector back to the eye box.

[0009] The PGU image source is rotated by the angle adjustment component and then cooperates with the first and second reflectors to obtain virtual images at different angles.

[0010] Furthermore, the PGU image source has three positions after being rotated by the angle adjustment component, and the first and second reflectors are used to adapt the PGU image source to different positions.

[0011] Furthermore, the first and second reflectors are optical lenses.

[0012] Furthermore, the first and second reflecting mirrors are a combination of a plane mirror and a freeform surface mirror.

[0013] Furthermore, the first and second reflectors are combinations of freeform mirrors and freeform mirrors.

[0014] Furthermore, the PGU image source is a laser light source, an LCD light source, or an LED light source.

[0015] Furthermore, the angle adjustment assembly includes a housing, a bracket, a drive assembly, and a control assembly. The PGU image source is mounted on the bracket, the bracket is rotatably mounted inside the housing, the drive assembly is used to drive the bracket to rotate, and the control assembly is used to control the three rotational positions of the bracket.

[0016] Furthermore, the drive assembly includes a motor fixedly connected to the bottom wall of the housing, a worm gear fixedly connected to the output end of the motor, a rotating shaft rotatably connected between the inner walls of the front and rear sides of the housing via bearings, the outer surface of the rotating shaft being fixedly connected to a bracket via a connecting seat, a worm wheel fixedly connected to the outer surface of the rotating shaft, the worm wheel meshing with the worm gear, and the motor being electrically connected to the control assembly.

[0017] Furthermore, the motor is a servo motor.

[0018] Furthermore, the control component includes a HUD controller and a sensor, the sensor being electrically connected to the HUD controller, and three sensing plates corresponding to the sensor being fixedly connected to the outer surface of the connector.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The oblique projection optical structure provided by this utility model for head-up display systems allows for adjustment of the position of the PGU image source via an angle adjustment component, which in turn changes the virtual image. Furthermore, by altering the surface shapes of the first and second reflectors during the optical design process to adapt to different object-image relationships, virtual images at different angles can be obtained by changing the rotation angle of the PGU image source. This enables continuous adjustment of the angle between the virtual image and the ground, expanding the depth-of-field variation range of the HUD system and adapting to different types of HUDs to meet the needs of different users. Attached Figure Description

[0021] Figure 1 Schematic diagrams of virtual images at different angles for the oblique projection optical structure suitable for head-up display systems provided by this utility model;

[0022] Figure 2 A schematic diagram of the first virtual image of the oblique projection optical structure for a head-up display system provided by this utility model;

[0023] Figure 3 The oblique projection optical structure for head-up display systems provided by this utility model Figure 2 Enlarged diagram in the image;

[0024] Figure 4 A schematic diagram of the second virtual image of the oblique projection optical structure suitable for head-up display systems provided by this utility model;

[0025] Figure 5 The oblique projection optical structure for head-up display systems provided by this utility model Figure 4 Enlarged diagram in the image;

[0026] Figure 6 A schematic diagram of the third virtual image of the oblique projection optical structure for head-up display systems provided by this utility model.

[0027] The markings in the diagram are explained as follows:

[0028] 1. PGU image source; 2. Eye box; 3. First reflector; 4. Second reflector; 5. Windshield; 6. Virtual image; 7. Angle adjustment component; 11. Housing; 12. Bracket; 71. Motor; 72. Worm gear; 73. Shaft; 74. Connecting seat; 75. Worm wheel; 76. Sensor; 77. Sensor plate. Detailed Implementation

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

[0030] As described in the background section, existing HUDs on the market are all oblique projection solutions, where the tilt angle of the virtual image surface is fixed and cannot be adjusted, making it unsuitable for different user needs. Furthermore, HUDs suffer from poor virtual image surface alignment with the ground and poor integration of the virtual image with the real world.

[0031] To address this technical problem, this invention provides an oblique projection optical structure suitable for head-up display systems. This structure allows for continuous adjustment of the angle between the virtual image plane and the ground, expanding the depth-of-field range of the HUD system and adapting to different types of HUDs to meet the needs of various users.

[0032] For details, please refer to Figure 1-6 The oblique projection optical structure suitable for head-up display systems specifically includes:

[0033] PGU image source 1 and eye box 2, PGU image source 1 is used to output the displayed image, and eye box 2 is used to receive the image output by PGU image source 1;

[0034] The first reflector 3, the second reflector 4, and the windshield 5 are arranged in the optical path of the PGU image source 1. The first reflector 3 is used to reflect the light emitted by the PGU image source 1 for the first time, the second reflector 4 is used to reflect the light reflected by the first reflector 3 for the second time, and the windshield 5 is used to reflect the light reflected by the second reflector 4 to the eye box 2.

[0035] After the PGU image source 1 is rotated by the angle adjustment component 7, it cooperates with the first reflector 3 and the second reflector 4 to obtain virtual images 6 at different angles. This allows the reflecting surfaces of the first reflector 3 and the second reflector 4 to be adapted to virtual images 6 at different angles.

[0036] The oblique projection optical structure provided by this utility model is suitable for head-up display (HUD) systems. In this HUD optical system, the object and image are conjugate, that is, the object corresponds to the virtual image 6 in the HUD system, and the virtual image 6 corresponds to the PGU image source 1 of the HUD system. Since the object and image are conjugate, the virtual image 6 will change accordingly by adjusting the position of the PGU image source 1 through the angle adjustment component 7. Furthermore, the surface shape of the first reflector 3 and the second reflector 4 can be changed during the optical design process to adapt to different object-image relationships. Thus, by changing the rotation angle of the PGU image source 1, virtual images 6 at different angles can be obtained. This allows for continuous adjustment of the angle between the virtual image 6 and the ground, which can expand the depth range of the HUD system and adapt to different types of HUDs to meet the needs of different users.

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0038] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0039] It should be noted that similar labels and letters in the following figures indicate similar tops; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] Example 1

[0041] Please refer to Figure 1-6 An oblique projection optical structure suitable for a head-up display system includes a PGU image source 1 and an eye box 2. The PGU image source 1 is used to output the displayed image, and the eye box 2 is used to receive the image output by the PGU image source 1.

[0042] The first reflector 3, the second reflector 4, and the windshield 5 are arranged in the optical path of the PGU image source 1. The first reflector 3 is used to reflect the light emitted by the PGU image source 1 for the first time, the second reflector 4 is used to reflect the light reflected by the first reflector 3 for the second time, and the windshield 5 is used to reflect the light reflected by the second reflector 4 to the eye box 2.

[0043] After the PGU image source 1 is rotated by the angle adjustment component 7, it cooperates with the first reflector 3 and the second reflector 4 to obtain virtual images 6 at different angles. This allows the reflecting surfaces of the first reflector 3 and the second reflector 4 to be adapted to virtual images 6 at different angles.

[0044] In this HUD system, the image is generated by PGU image source 1, passes through the first reflector 3, the second reflector 4 and the windshield 5, and finally reaches the human eye at the eye box 2. The image perceived by the human eye is then displayed. Figure 1 The position shown in virtual image 6.

[0045] The oblique projection optical structure for head-up display systems provided in this embodiment adjusts the position of the PGU image source 1 by adjusting the angle adjustment component 7, and the virtual image 6 will also change accordingly. In addition, the surface shape of the first reflector 3 and the second reflector 4 can be changed during the optical design process to adapt to different object-image relationships. Thus, by changing the rotation angle of the PGU image source 1, virtual images 6 at different angles can be obtained. The angle between the virtual image 6 and the ground can be continuously adjusted, which can expand the depth range of the HUD system.

[0046] Example 2

[0047] The oblique projection optical structure for head-up display systems provided in Example 1 is further optimized, specifically, as follows: Figure 1-3 As shown, the PGU image source 1 has three positions after being rotated by the angle adjustment component 7. The first reflector 3 and the second reflector 4 are used to adapt the PGU image source 1 to different positions.

[0048] Example 3

[0049] The oblique projection optical structure for head-up display systems provided in Embodiment 1 or 2 is further optimized, such as... Figure 3 As shown, the first reflecting mirror 3 and the second reflecting mirror 4 are optical lenses; the first reflecting mirror 3 and the second reflecting mirror 4 are a combination of freeform mirrors; the PGU image source 1 is a laser light source, an LCD light source or an LED light source, so that after reflection by the first reflecting mirror 3 and the second reflecting mirror 4, a better imaging effect can be achieved.

[0050] Specifically, the first reflecting mirror 3 and the second reflecting mirror 4 are a combination of a plane mirror and a freeform surface mirror.

[0051] Example 4

[0052] The oblique projection optical structure for head-up display systems provided in the above embodiments is further optimized, such as... Figure 3 and Figure 5 As shown, the angle adjustment assembly 7 includes a housing 11, a bracket 12, a drive assembly, and a control assembly. The PGU image source 1 is mounted on the bracket 12, and the bracket 12 is rotatably mounted inside the housing 11. The drive assembly is used to drive the bracket 12 to rotate, and the control assembly is used to control the three rotational positions of the bracket 12.

[0053] The drive assembly includes a motor 71 fixedly connected to the bottom wall of the housing 11. A worm gear 72 is fixedly connected to the output end of the motor 71. A rotating shaft 73 is rotatably connected between the inner walls of the front and rear sides of the housing 11 via bearings. The outer surface of the rotating shaft 73 is fixedly connected to the bracket 12 via a connecting seat 74. A worm wheel 75 is fixedly connected to the outer surface of the rotating shaft 73. The worm wheel 75 meshes with the worm gear 72. The motor 71 is electrically connected to the control assembly. The motor 71 is a servo motor.

[0054] The motor 71 drives the worm gear 72 to rotate. During the rotation of the worm gear 72, the worm wheel 75, the connecting seat 74 and the rotating shaft 73 can rotate. During the rotation of the rotating shaft 73, the bracket 12 and the PGU image source 1 can rotate. When the sensor 76 detects the sensing plate 77, the rotation of the motor 71 stops. Thus, the change of the PGU image source 1 is realized by a mechanical mechanism. Its mechanical structure includes, but is not limited to, this structure. It can be any structure that changes the position of the PGU image source 1.

[0055] The control components include a HUD controller and a sensor 76. The sensor 76 is electrically connected to the HUD controller, and three sensing plates 77 corresponding to the sensor 76 are fixedly connected to the outer surface of the connector 74.

[0056] In this way, the three sensing elements 77 work together with the sensor 76 to precisely control the rotation of the PGU image source 1 to three positions, resulting in better image quality.

[0057] The usage process of the oblique projection optical structure for head-up display systems provided by this utility model is as follows:

[0058] In the optical system of the head-up display, the objects and images are conjugate, that is, the object corresponds to the virtual image 6 in the HUD system, and the virtual image 6 corresponds to the PGU image source 1 of the HUD system. Since the objects and images are conjugate, the virtual image 6 will also change when the position of the PGU image source 1 is adjusted by the angle adjustment component 7. Furthermore, the surface shape of the first reflector 3 and the second reflector 4 can be changed during the optical design process to adapt to different object-image relationships. Thus, virtual images 6 at different angles can be obtained by changing the rotation angle of the PGU image source 1.

[0059] In the optical design, the surface shapes of the first reflecting mirror 3 and the second reflecting mirror 4 are designed according to the following steps:

[0060] S1, such as Figure 2 As shown, the PGU image source 1 remains unchanged, and the surface shape of the positions of the first reflecting mirror 3 and the second reflecting mirror 4 is optimized to obtain a first virtual image 6 with better imaging quality.

[0061] S2, such as Figure 4As shown, by rotating the angle of the PGU image source 1 through the angle adjustment component 7, the second position of the PGU image source 1 is obtained. Then, the surface shape of the positions of the first reflector 3 and the second reflector 4 is optimized to obtain a second virtual image 6 with better imaging quality.

[0062] S3, such as Figure 6 As shown, based on the above, the angle of the PGU image source 1 is rotated by the angle adjustment component 7 to obtain the second position of the PGU image source 1. Then, the surface shape of the positions of the first reflector 3 and the second reflector 4 is optimized to obtain a third virtual image 6 with better imaging quality.

[0063] S4. By optimizing the surface shape of the positions of the first reflecting mirror 3 and the second reflecting mirror 4, the imaging quality of the virtual image 6 can be ensured to be relatively good, thus obtaining an optical design scheme in which the tilt angle of the virtual image 6 can be continuously adjusted.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A slanted projection optical structure suitable for head-up display systems, characterized in that, It includes: PGU image source (1) and eye box (2), wherein the PGU image source (1) is used to output the displayed image and the eye box (2) is used to receive the image output by the PGU image source (1); The first reflector (3), the second reflector (4), and the windshield (5) are arranged in the optical path of the PGU image source (1). The first reflector (3) is used to reflect the light emitted by the PGU image source (1) for the first time, and the second reflector (4) is used to reflect the light reflected by the first reflector (3) for the second time. The windshield (5) is used to reflect the light reflected by the second reflector (4) to the eye box (2). The PGU image source (1) is rotated by the angle adjustment component (7) and then cooperates with the first reflector (3) and the second reflector (4) to obtain virtual images (6) at different angles.

2. The oblique projection optical structure suitable for head-up display systems according to claim 1, characterized in that, The PGU image source (1) has three positions after being rotated by the angle adjustment component (7), and the first reflector (3) and the second reflector (4) are used to adapt the PGU image source (1) to different positions.

3. The oblique projection optical structure suitable for head-up display systems according to claim 2, characterized in that, The first reflector (3) and the second reflector (4) are optical lenses.

4. The oblique projection optical structure suitable for head-up display systems according to claim 2, characterized in that, The first reflector (3) and the second reflector (4) are a combination of a plane mirror and a freeform mirror.

5. The oblique projection optical structure suitable for head-up display systems according to claim 2, characterized in that, The first reflector (3) and the second reflector (4) are a combination of freeform mirrors and freeform mirrors.

6. The oblique projection optical structure suitable for head-up display systems according to claim 1, characterized in that, The PGU image source (1) is a laser light source, an LCD light source, or an LED light source.

7. The oblique projection optical structure suitable for head-up display systems according to claim 1, characterized in that, The angle adjustment component (7) includes a housing (11), a bracket (12), a drive component, and a control component. The PGU image source (1) is mounted on the bracket (12). The bracket (12) is rotatably mounted inside the housing (11). The drive component is used to drive the bracket (12) to rotate. The control component is used to control the three rotational positions of the bracket (12).

8. The oblique projection optical structure for a head-up display system according to claim 7, characterized in that, The drive assembly includes a motor (71) fixedly connected to the bottom wall of the housing (11). The output end of the motor (71) is fixedly connected to a worm gear (72). A rotating shaft (73) is rotatably connected between the inner walls of the front and rear sides of the housing (11) through a bearing. The outer surface of the rotating shaft (73) is fixedly connected to the bracket (12) through a connecting seat (74). A worm wheel (75) is fixedly connected to the outer surface of the rotating shaft (73). The worm wheel (75) meshes with the worm gear (72). The motor (71) is electrically connected to the control assembly.

9. The oblique projection optical structure for a head-up display system according to claim 8, characterized in that, The motor (71) is a servo motor.

10. The oblique projection optical structure for a head-up display system according to claim 8, characterized in that, The control component includes a HUD controller and a sensor (76). The sensor (76) is electrically connected to the HUD controller. Three sensing plates (77) corresponding to the sensor (76) are fixedly connected to the outer surface of the connector (74).

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