Internal projection HUD system and vehicle

Abstract

The invention provides an internal projection HUD system and a vehicle, and the system comprises an image source which is used for emitting a light beam; and the reflection imaging assembly is arranged on a propagation path of the light beam emitted by the image source, and the reflection imaging assembly is arranged to directly receive the light beam emitted by the image source, carry out light path folding on the light beam, and reflect the light beam to a target position in the air to converge into a real image. Compared with the prior art that an HUD system adopts virtual image imaging, real image imaging in the air is achieved, under the condition that an eye box exists, the real image can provide closer imaging visual experience for viewers, the real image is subjected to close-range imaging, the shallow depth-of-field effect can be generated, the background of the presented image is fuzzified, and therefore the main body is highlighted; and the presented image is more stereoscopic, layered and artistic. Under the condition of no eye box, the real image can be reused (a diffusion film and a one-way permeable film are added), so that the application scene of the real image is more diversified and richer, and the virtual image cannot be reused.

Description

Technical Field

[0001] The present application relates to the field of head-up display technology, and in particular, to an internal projection HUD system and a vehicle having the same. Background Art

[0002] The existing head-up display (HUD) systems all use virtual image imaging, that is, the virtual image is formed at different distances of 2.5m to 7.5m in front of the vehicle for the driver to look up and observe. However, in actual use, it is found that the virtual image imaging distance is far and is located outside the last reflector (or windshield), lacking three-dimensional and layered sense, the user's visual viewing experience is not good, and the virtual image cannot be reused, resulting in limited usage scenarios. Summary of the invention

[0003] Based on the above situation, the main purpose of the present invention is to provide an internal projection HUD system, aiming to solve the technical problems in the prior art that the head-up display system is a virtual image with a long imaging distance and is located outside the last reflector (or windshield), lacks three-dimensional sense and layering, and the user's visual viewing experience is poor, and the virtual image cannot be reused, resulting in limited usage scenarios.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A first aspect of an embodiment of the present invention provides an internal projection HUD system, including:

[0006] An image source, for emitting a light beam;

[0007] A reflective imaging component is arranged on the propagation path of the light beam emitted by the image source. The reflective imaging component is configured to directly receive the light beam emitted by the image source, fold the light path of the light beam, and reflect the light beam to a target position in the air to converge into a real image.

[0008] Optionally, the internal projection HUD system is provided with an eye box at a set distance of the real image, and the real image is suitable for entering the human eye through the eye box.

[0009] Optionally, the reflective imaging component includes a first reflector and a second reflector for reflecting the light beam, at least one of the first reflector and the second reflector is also used to converge the light beam, the first reflector is located in the light emitting direction of the image source, and the second reflector is located in the light beam reflection direction of the first reflector, the light beam emitted by the image source is reflected and converged by the first reflector and the second reflector, and then emitted by the second reflector to form the real image at the target position in the air.

[0010] Optionally, the reflective imaging component includes a first reflector, a second reflector and a third reflector for reflecting the light beam, at least one of the first reflector, the second reflector and the third reflector is also used to converge the light beam, the first reflector is located in the light emitting direction of the image source, the second reflector is located in the light beam reflection direction of the first reflector, the third reflector is located in the light beam reflection direction of the second reflector, and at the same time, the second reflector is also located in the light beam reflection direction of the third reflector, the light beam emitted by the image source is reflected by the first reflector and the second reflector, the light beam reflected by the second reflector is emitted to the third reflector and reflected by the third reflector and then emitted back to the second reflector, and finally the light beam is emitted to the air by the second reflector, and during the reflection process of the light beam, at least one of the first reflector, the second reflector and the third reflector converges the light beam so that the light beam emitted by the second reflector forms the real image at the target position in the air.

[0011] Optionally, the reflective imaging component includes a first reflector and a second reflector for reflecting the light beam, at least one of the first reflector and the second reflector is also used to converge the light beam, the first reflector is located in the light emitting direction of the image source, the second reflector is located in the light beam reflection direction of the first reflector, the light beam reflection direction of the second reflector points to the windshield, the light beam emitted by the image source is reflected and converged by the first reflector and the second reflector, and then emitted by the second reflector to the concave surface of the windshield, and the concave surface of the windshield reflects the light beam to the target position in the air to form the real image.

[0012] Optionally, the surface formulas of the first reflector, the second reflector and the third reflector are:

[0013]

[0014] Among them, r 2 =x 2 +y 2 , z represents the sagittal height difference in the Z-axis direction, c represents the curvature, k represents the conic surface constant, and m and n represent the orders of x and y respectively.

[0015] Optionally, the ratio of the real image area to the light-emitting area of ​​the image source is 1.5-2.5.

[0016] Optionally, the target position of the real image is located at the position of the vehicle's onboard instrument panel and central control display screen.

[0017] A second aspect of an embodiment of the present invention provides a vehicle, comprising the internal projection HUD system as described in any one of the above items.

[0018] Beneficial effects:

[0019] An internal projection HUD system provided by an embodiment of the present invention includes an image source and a reflective imaging component, wherein the image source is used to emit a light beam, and the reflective imaging component is used to reflect and image the light beam. The reflective imaging component is arranged on the propagation path of the light beam emitted by the image source, and the reflective imaging component is arranged to directly receive the light beam emitted by the image source, fold the light path of the light beam, and reflect the light beam to a target position in the air to converge into a real image.

[0020] First, compared with the virtual image imaging adopted by the HUD system of the prior art, the embodiment of the present invention realizes the real image imaging in the air. In the case of an eye box, the real image can provide the viewer with a closer visual experience of imaging. The real image is imaged at a close distance, which can produce a shallow depth of field effect similar to close-up photography, so that the background of the presented image is blurred, thereby highlighting the subject and making the presented image more three-dimensional, layered and artistic. Furthermore, since the real image imaging distance is relatively close, the viewer's eyes will focus on the real image in the near distance, and the background picture will be in a state of blurring. The presented image is clear as if it is out of the picture, which has a cooler sense of technology. The virtual image is far away and is located on the outside of the last reflector (or windshield), and the shallow depth of field effect cannot be achieved. The real image is closer, located on the inside of the last reflector (or windshield), closer and more real. When the system of the embodiment of the present invention is applied to a vehicle, the eye box is designed at the position of the driver's or co-pilot's eyes, so that the driver or co-pilot can better see a clear and stable real image.

[0021] In the absence of an eye box, the real image imaging achieved by the internal projection HUD system based on the embodiment of the present invention can further reuse the real image (adding a diffusion film or a one-way transparent film), thereby making the application scenarios of the real image more diverse and rich, while the virtual image cannot be reused.

[0022] Secondly, the reflective imaging assembly of the embodiment of the present invention is configured to directly receive the light beam emitted by the image source, which has a simpler structure than entering the imaging optical assembly through an optical shaping element (such as a collimating optical element).

[0023] Furthermore, the present invention adopts a lightweight design of a reflective structure, which only includes an image source and a reflective imaging component to realize a real image. It has a simple and compact structure and a small size, which not only saves costs but is also easy to assemble.

[0024] Other beneficial effects of the present invention will be explained in the specific implementation manner through the introduction of specific technical features and technical solutions. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preferred embodiment of the internal projection HUD system of the present invention will be described below with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram of an optical path design of an internal projection HUD system according to a preferred embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the structure of the internal projection HUD system;

[0028] Figure 3 yes Figure 1 Schematic diagram of the optical path design of the internal projection HUD system;

[0029] Figure 4 is a schematic diagram of an optical path design of an internal projection HUD system according to another preferred embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of an optical path design of an internal projection HUD system according to a preferred embodiment of the present invention where the optical path does not pass through a windshield;

[0031] Figure 6 It is a schematic diagram of the optical path design of the internal projection HUD system passing through the windshield according to a preferred embodiment of the present invention.

[0032] Reference numerals:

[0033] 1. Image source; 2. Reflective imaging component; 21. First reflector; 22. Second reflector; 23. Third reflector; 3. Light beam; 4. Real image; 5. Eye box; 6. Windshield. DETAILED DESCRIPTION

[0034] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid confusing the essence of the present invention, known methods, processes, procedures, and components are not described in detail.

[0035] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0036] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0037] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0038] Before introducing the specific implementation of the present invention, some of the terms used herein are explained. It should be noted that these explanations are for the purpose of facilitating the understanding of those skilled in the art, and are not intended to limit the scope of protection claimed by the present invention.

[0039] HUD system: The HUD (Head Up Display) system, also known as the head-up display system, is a technology that projects important information onto the driver's windshield, designed to help the driver obtain key driving information without lowering or turning his head. It should be noted that in this article, the projection position of the image is no longer limited to projecting the image onto the driver's windshield. In some usage scenarios, the projection of the image does not rely on the windshield. The optical principle of the HUD system is based on the reflection and / or refraction of light. Its basic structure includes a light source, a reflector, and a transparent display screen. The light emitted by the light source is reflected by the reflector to form a virtual image. This image is projected onto the transparent display screen and then reflected back into the driver's eyes. Since this image looks like it is in front of the driver, it can reduce the driver's line of sight and improve driving safety. The optical principle of the HUD system also involves the visual principle of the human eye. The human eye can see objects because the light reflected or emitted by the object enters the human eye. When the light enters the human eye, it is refracted by the lens and vitreous body, and then forms an inverted real image on the retina. The photoreceptor cells on the retina convert light signals into electrical signals, which are then transmitted to the brain through the optic nerve, ultimately forming the image we see. In the HUD system, the image on the display screen is reflected and enters the driver's eyes. Since this image has been reflected twice, it forms an inverted virtual image on the retina. However, due to the visual adaptability of the human eye, we can still see an upright image. In short, the optical principle of the HUD head-up display system is based on the reflection and refraction of light and the visual principle of the human eye. It reduces the driver's line of sight diversion and improves driving safety by projecting a virtual image onto a transparent display screen and then reflecting it back into the driver's eyes.

[0040] Eye box: In the HUD head-up display system, the eye box refers to the area where the eyes can move, that is, the position range of the driver's eyes. The size and position of this area are affected by factors such as the driver's height, sitting posture, and head position, resulting in different driving perspectives for each person. The concept of the eye box is very important in HUD design because it is directly related to whether the driver can clearly see the information displayed by the HUD. If the eyes are located in the eye box area, the entire image can be seen clearly; conversely, if they are out of this area, the entire image cannot be seen. Therefore, the design of the HUD needs to take into account the eye box position of different drivers to ensure the effective display of information.

[0041] Real image and virtual image: In the HUD head-up display system, the distinction between real image and virtual image is mainly based on the imaging principle and observation method. The real image is an image formed by the convergence of actual light and can be presented on the light screen. In the HUD system, the real image usually refers to the image formed by the actual convergence of lenses or other optical elements. This image can be directly observed by adjusting the position because it does exist in a certain physical position. The virtual image is an image formed by the intersection of the reverse extension lines of the actual light and cannot be presented on the light screen. In the HUD system, the virtual image usually refers to the image formed by reflection or refraction by plane mirrors or other optical elements. Although these images are not directly formed by actual light, through the design of the optical system, the driver can observe these images without moving his eyes because they are actually formed by the intersection of the extension lines of the light path.

[0042] Image source: Also known as the picture generation unit (PGU), the image source is one of the core components of the HUD head-up display system, which is responsible for generating images. In the HUD system, the image source generates light sources, which are magnified and projected onto the driver's eye activity area, so that important driving information such as speed and navigation can be projected onto the driver's front windshield, allowing the driver to obtain driving information without lowering or turning his head. This design helps improve driving safety.

[0043] In related technologies, HUD systems all use virtual image imaging, that is, the virtual image is formed at different distances of 2.5m to 7.5m in front of the vehicle for the driver to look up and observe. However, in actual use, it is found that the virtual image imaging distance is far and is located outside the last reflector (or windshield), which cannot achieve a shallow depth of field effect, and the user's visual viewing experience is poor.

[0044] To do this, refer to Figures 1 to 6An embodiment of the present invention provides an internal projection HUD system, including an image source 1 and a reflective imaging component 2, wherein the image source 1 is used to emit a light beam 3, and the reflective imaging component 2 is used to reflect and image the light beam 3. The reflective imaging component 2 is arranged on the propagation path of the light beam 3 emitted by the image source 1, and the reflective imaging component 2 is arranged to directly receive the light beam 3 emitted by the image source 1 and fold the optical path of the light beam 3, and reflect the light beam 3 to a target position in the air to converge into a real image 4.

[0045] The image source 1 generates a light source to emit a light beam 3 carrying image information. The image information may be, for example, vehicle instrument panel information and / or central control display screen image information, which is not limited in the present invention. The light beam 3 of the image source 1 is emitted in a direction toward the reflective imaging component 2. The light beam 3 is emitted by the image source 1 and enters the reflective imaging component 2. The reflective imaging component 2 adjusts the propagation direction and then emits the light beam, converging into a real image 4 at the target position in the air.

[0046] The reflective imaging component 2 is used to fold the optical path of the light beam 3. In the embodiment of the present invention, optical path folding refers to designing a system using the reflective imaging component 2 to avoid introducing chromatic aberration so as to realize image reflection and display in a limited optical path space. The reflective imaging component 2 is arranged in the propagation direction of the light beam 3 emitted by the image source 1. The reflective imaging component 2 is further arranged to directly receive the light beam 3 emitted by the image source 1, that is, the light beam 3 does not pass through any light beam 3 shaping element from the image source 1 to the reflection imaging component 2. The reflective imaging element realizes the optical path folding of the light beam 3 by reflecting the light beam 3. By designing the reflective imaging component 2, the light beam 3 reflected from the reflective imaging component 2 can converge into a real image 4 at the target position in the air.

[0047] The internal projection HUD system is provided with an eye box 5 at a set distance from the real image 4, and the real image 4 is suitable for entering the human eye through the eye box 5. The internal projection HUD system of the embodiment of the present invention is also designed with an eye box 5, which is designed at a set distance and a set orientation from the imaging position of the real image 4. The design of the eye box 5 makes the real image 4 suitable for entering the human eye through the eye box 5.

[0048] Compared with the virtual image imaging adopted by the HUD system of the related art, the embodiment of the present invention realizes the imaging of the real image 4 in the air. The real image can provide the viewer with a closer visual experience. The real image is imaged at a close distance, which can produce a shallow depth of field effect similar to close-up photography, so that the background of the presented image is blurred, thereby highlighting the subject and making the presented image more three-dimensional, layered and artistic. Furthermore, since the real image imaging distance is relatively close, the viewer's eyes will focus on the real image nearby, and the background picture will be blurred. The presented image is clear as if it is out of the picture, which has a cooler sense of technology. The virtual image is far away and is located on the outside of the last reflector (or windshield), and the shallow depth of field effect cannot be achieved. The real image is closer, located on the inside of the last reflector (or windshield), which is closer and more real. After the real image is designed for the case of internal projection without an eye box, the real image can also be reused (adding a diffusion film or a one-way transmission film), but the virtual image cannot be reused.

[0049] Secondly, the reflective imaging component 2 of the present invention is configured to directly receive the light beam 3 emitted by the image source 1, and the structure is simpler than entering the imaging optical component through an optical shaping element such as a collimating optical element. Furthermore, the present invention adopts a lightweight design of a reflective structure, and only includes the image source 1 and the reflective imaging component 2 to realize imaging as a real image 4. The structure is simple and compact, and the volume is small, which not only saves costs but also is easy to assemble. In addition, the present invention also provides an eye box 5 at a set position away from the real image 4, and the real image 4 is suitable for entering the human eye through the eye box 5, so that the viewer can observe the real image 4 with the naked eye within the range of the eye box 5, thereby realizing medium-free imaging. When the embodiment system of the present invention is applied to a vehicle, the eye box 5 is designed at the eye position of the driver or the co-driver, so that the driver or the co-driver can better view the clear and stable real image 4.

[0050] In some implementations of the internal projection HUD system of the present invention, such as Figure 1 , Figure 2 and Figure 3 As shown, the reflective imaging component 2 includes a first reflector 21 and a second reflector 22 for reflecting a light beam 3, at least one of the first reflector 21 and the second reflector 22 is also used to converge the light beam 3, the first reflector 21 is located in the light emitting direction of the image source 1, and the second reflector 22 is located in the reflection direction of the light beam 3 of the first reflector 21, and the light beam 3 emitted by the image source 1 is reflected and converged by the first reflector 21 and the second reflector 22, and then emitted by the second reflector 22 to form the real image 4 at the target position in the air.

[0051] In some possible implementation schemes under this embodiment, the first reflector 21 is used as a secondary mirror, and can be a plane mirror, a curved mirror, a spherical mirror, an aspherical mirror or a free-form mirror, and is configured to reflect the light beam 3 only. The second reflector 22 is used as a primary mirror, and can be a curved mirror, a spherical mirror, an aspherical mirror or a free-form mirror, and is configured to reflect and converge the light beam 3. When in use, the light beam 3 emitted by the image source 1 is first incident on the first reflector 21, and then incident on the second reflector 22 after being reflected by the first reflector 21. The second reflector 22 reflects and converges the light beam 3 and then emits the light beam 3 to the target position in the air to form a real image 4. It should be noted that the present invention does not impose any special restrictions on this. In other possible implementation schemes, the first reflector 21 can also be used to reflect and converge the light beam 3, and the second reflector 22 is only used to reflect the light beam 3, as long as the real image 4 can be formed at the target position in the air after reflection and convergence by the first reflector 21 and the second reflector 22.

[0052] The HUD system can directly form a real image 4 in the air by reflecting and converging the light beam 3 by the first reflector 21 and the second reflector 22. The reflective imaging component 2 only includes the first reflector 21 and the second reflector 22, has a simple structure, a small volume, a wide range of application scenarios and a low cost.

[0053] The present invention is not limited to the reflective imaging component 2 comprising only two reflectors. In other embodiments of the internal projection HUD system of the present invention, for example, Figure 4 As shown, the reflective imaging assembly 2 includes a first reflector 21, a second reflector 22 and a third reflector 23 for reflecting a light beam 3. At least one of the first reflector 21, the second reflector 22 and the third reflector 23 is also used to converge the light beam 3. The first reflector 21 is located in the light emitting direction of the image source 1, the second reflector 22 is located in the light beam 3 reflecting direction of the first reflector 21, and the third reflector 23 is located in the light beam 3 reflecting direction of the second reflector 22. At the same time, the second reflector 22 is also located in the light beam 3 reflecting direction of the third reflector 23. The image source 1 emits The light beam 3 emitted is reflected by the first reflector 21 and the second reflector 22, the light beam 3 reflected by the second reflector 22 is emitted to the third reflector 23 and reflected by the third reflector 23 and then emitted back to the second reflector 22, and finally the light beam 3 is emitted to the air by the second reflector 22. During the reflection process of the light beam 3, at least one of the first reflector 21, the second reflector 22 and the third reflector 23 converges the light beam 3 so that the light beam 3 emitted by the second reflector 22 forms the real image 4 at the target position in the air.

[0054] In some possible implementation schemes under this embodiment, the first reflector 21 can be a plane mirror, a curved mirror, a spherical mirror, an aspherical mirror or a free-curved mirror, and is configured to reflect the light beam 3 only. The second reflector 22 can be a curved mirror, a spherical mirror, an aspherical mirror or a free-curved mirror, and is configured to reflect and converge the light beam 3. The third reflector 23 can be a plane mirror, a curved mirror, a spherical mirror, an aspherical mirror or a free-curved mirror, and is configured to reflect the light beam 3. When in use, the light beam 3 emitted by the image source 1 first enters the first reflector 21, and then enters the second reflector 22 after being reflected by the first reflector 21. The second reflector 22 reflects the light beam 3 and then enters the third reflector 23. After the third reflector 23 reflects the light beam 3, the light beam 3 is re-emitted back to the second reflector 22. The second reflector 22 further reflects and converges the light beam 3, and the light beam 3 emitted from the second reflector 22 enters the target position in the air to form a real image 4. Similarly, the present invention is not limited to the above-mentioned implementation scheme. It can be understood that in other possible implementation schemes, the first reflector 21 and the third reflector 23 can also be used to reflect and converge the light beam 3, as long as a real image 4 can be formed at the air target position after reflection and convergence by the first reflector 21, the second reflector 22 and the third reflector 23.

[0055] Compared with two reflectors, the reflective imaging assembly 2 composed of three reflectors is used. By adding a reflector, the design variables are increased, and it is easier to design a good imaging effect. The light beam 3 reflected by the second reflector 22 is directed to the third reflector 23 and reflected by the third reflector 23 and then directed back to the second reflector 22. Finally, the second reflector 22 directs the light beam 3 to the air. This design can save space and reduce the volume of the reflective imaging assembly 2. One reflector (the second reflector 22) performs two reflections. Without increasing the total number of lenses, the number of design variables is increased, the design difficulty is reduced, and the overall volume can be kept small.

[0056] In some other implementations of the internal projection HUD system of the embodiment of the present invention, the image source 1 includes a first light emitting area and a second light emitting area, the first light emitting area is used to emit a first light beam 3, and the second light emitting area is used to emit a second light beam 3; the reflective imaging component 2 includes a first reflector 21 and a second reflector 22, the first reflector 21 has a first reflective area and a second reflective area, and the second reflector 22 has a third reflective area and a fourth reflective area.

[0057] When in use, the first light emitting area emits a first light beam 3, the first light beam 3 enters the first reflection area of ​​the first reflector 21, and after being reflected by the first reflection area, enters the third reflection area of ​​the second reflector 22, and after being reflected by the third reflection area, the light beam 3 is emitted to the first target position in the air to form a first real image 4. The second light emitting area emits a second light beam 3, the second light beam 3 enters the second reflection area of ​​the first reflector 21, and after being reflected by the second reflection area, enters the fourth reflection area of ​​the second reflector 22, and after being reflected by the fourth reflection area, the light beam 3 is emitted to the second target position in the air to form a second real image 4. The first real image 4 and the second real image 4 are suitable for entering the human eye through the eye box 5.

[0058] Through the internal projection HUD system of this embodiment, two real images 4 are formed only by a reflective structure, which on the one hand further increases the richness of the image, and on the other hand, by partitioning the image source 1 and the reflector, two real images 4 can be formed by only one set of image source 1 and one set of reflective structure.

[0059] Further, in some preferred implementation schemes under this embodiment, the first reflection area and the second reflection area of ​​the first reflector 21 are adjacent and do not overlap, and the third reflection area and the fourth reflection area of ​​the second reflector 22 are adjacent and do not overlap. The projection areas of the first light beam 3 and the second light beam 3 on the first reflector 21 and the second reflector 22 are adjacent and do not overlap.

[0060] In some other preferred implementation schemes under this embodiment, the first reflection area and the second reflection area of ​​the first reflector 21 partially overlap, and the third reflection area and the fourth reflection area of ​​the second reflector 22 do not overlap. In this way, the projection areas of the first light beam 3 and the second light beam 3 on the first reflection area and the second reflection area partially overlap, and after being reflected by the first reflection area and the second reflection area respectively, the projection areas on the third reflection area and the fourth reflection area are separated, that is, the optical paths of the first light beam 3 and the second light beam 3 are separated in the third reflection area and the fourth reflection area of ​​the second reflector 22. After being reflected by the third reflection area and the fourth reflection area respectively, the first light beam 3 and the second light beam 3 form a first real image 4 and a second real image 4 in the air. In this embodiment, the reflection area of ​​the first reflector 21 can be reduced, which is conducive to reducing the overall volume and facilitating application.

[0061] In this embodiment, there may be some possible implementation schemes, such as the first reflection area and the second reflection area partially overlap, and the third reflection area and the fourth reflection area partially overlap.

[0062] In addition, in a preferred embodiment of the present invention, the first real image 4 and the second real image 4 are fused within the driver's eye box 5. Image fusion can bring better imaging effects and user experience.

[0063] The light beam 3 of the HUD system of the embodiment of the present invention may not pass through the windshield 6. Figure 5 As shown, the light beam 3 emitted by the image source 1 is reflected and converged by the reflective imaging component 2 to directly form a real image 4 at the target position in the air.

[0064] The light beam 3 of the HUD system of the embodiment of the present invention may also pass through the windshield 6, such as Figure 6 As shown, in some embodiments, the reflective imaging assembly 2 includes a first reflector 21 and a second reflector 22 for reflecting the light beam 3, at least one of the first reflector 21 and the second reflector 22 is also used to converge the light beam 3, the first reflector 21 is located in the light emitting direction of the image source 1, the second reflector 22 is located in the reflection direction of the light beam 3 of the first reflector 21, and the reflection direction of the light beam 3 of the second reflector 22 points to the windshield 6, the light beam 3 emitted by the image source 1 is reflected and converged by the first reflector 21 and the second reflector 22, and then the light beam 3 is emitted by the second reflector 22 to the concave surface of the windshield 6, and the concave surface of the windshield 6 reflects the light beam 3 to the target position in the air to form the real image 4. Compared with the reflective imaging assembly 2 directly imaging in the air, the embodiment of the present invention utilizes the original windshield 6 on the vehicle, which is equivalent to further increasing the number of reflective lenses, increasing design variables, and further reducing the design difficulty without increasing the volume.

[0065] Further, in the embodiment of the present invention, the first reflector 21, the second reflector 22 and the third reflector 23 are all free-form surface mirrors, and the surface shapes of the first reflector 21, the second reflector 22 and the third reflector 23 are obtained by the following formula:

[0066]

[0067] Among them, r 2 =x 2 +y 2 , z represents the sagittal height difference in the Z-axis direction, c represents the curvature, k represents the conic surface constant, and m and n represent the orders of x and y respectively.

[0068] From a design perspective, an important parameter is the magnification, which is the ratio of the area of ​​the real image 4 to the luminous area of ​​the image source 1. The magnification determines the difficulty of the design. The higher the magnification, the greater the difficulty of the design. In an embodiment of the present invention, the ratio of the area of ​​the real image 4 to the luminous area of ​​the image source 1 is 1.5-2.5, preferably 2.

[0069] In actual use, if the real image 4 is not clear enough, the image clarity can be adjusted by adjusting the size of the image source 1, the first reflector 21, and the second reflector 22, and the position and angle of the image source 1, the first reflector 21, and the second reflector 22. Figure 1 According to the surface calculation formula of the first reflector 21 and the second reflector 22, and the value of the magnification, the embodiment of the present invention proposes a set of preferred parameters, wherein the size of the image source 1 is: 50mm*25mm; the specific parameters of the first reflector 21 and the second reflector 22 are: the length of the large mirror of the second reflector 22 is 160mm, and the width is 120mm; the length of the small mirror of the first reflector 21 is 100mm, and the width is 70mm; the distance from the real image 4 to the second reflector 22 is 500mm±20mm, and the distance from the real image 4 to the eye box 5 is 550±20mm; the distance between the second reflector 22 and the first reflector 21 is is 250mm±20mm; the distance from the first reflector 21 to the image source 1 is 270mm±20mm; the focal length of the second reflector 22 is 400mm-500mm, the focal length of the first reflector 21 is 260mm-360mm, the second reflector 22 is deflected 10-20° around the X-axis (X in zemax is the positive direction of X inward from the paper), and the first reflector 21 is deflected 15-25° around the X-axis; assuming that the image source 1 is incident, the angle of the incident light beam 3 is 5.5°×5.5°, the outgoing light beam 3 forms a real image 4 of about 100mm*50mm in size, and the angle observed from the eye box 5 is about 10°*5°.

[0070] It should be noted that the set of parameters adopted in the above implementation is not the only solution, and different design results can be optimized according to actual needs.

[0071] For the embodiment in which the reflective imaging assembly 2 includes three reflectors, in actual use, if the obtained real image 4 is not clear enough, the image clarity can be adjusted by adjusting the size of the image source 1, the first reflector 21, the second reflector 22 and the third reflector 23, and the position and angle of the image source 1, the first reflector 21, the second reflector 22 and the third reflector 23. As an example, please refer to Figure 4According to the surface calculation formulas of the first reflector 21, the second reflector 22 and the third reflector 23, as well as the value of the magnification, the embodiment of the present invention proposes a set of preferred parameters, wherein the size of the real image 4 is: 46mm*28mm; the size of the image source 1 is: 40mm*20mm; the size of the first reflector 21 is: 20mm±10mm*20mm±10mm; the size of the second reflector 22 is: 100mm±10mm*84mm±10mm; the size of the third reflector 23 is: 90mm±10mm*50mm±10mm; the distance from the real image 4 to the eye box 5 is: 520mm±50mm; the distance from the window to the real image 4 is: 60mm±10mm; the distance from the image source 1 to the first reflector 21 is: 40mm±10mm; the distance from the first reflector 21 to the second reflector 22 is: 50mm±10mm; the distance from the third reflector 23 to the first reflector 21 is: 45mm±10mm; the distance from the second reflector 22 to the window is: 60mm±10mm. The image source 1 is an LCD, the first reflector 21 and the third reflector 23 are free-form surfaces, and the second reflector 22 is a plane mirror.

[0072] Through the above parameter settings, the embodiment of the present invention can obtain a clear and stable real image 4.

[0073] Furthermore, in an embodiment of the present invention, the target position of the real image 4 is located at the position of the vehicle's onboard instrument and / or central control display screen. By setting the position of the real image 4 formed by the HUD system at the position of the vehicle's onboard instrument and / or central control display screen, the vehicle can omit the onboard instrument and / or central control display screen, that is, the real image 4 replaces the vehicle's original onboard instrument and / or central control display screen, which can greatly simplify the structure, reduce costs, and increase the flexibility of system functions and the diversity of display effects compared to traditional vehicles.

[0074] An embodiment of the present invention further provides a vehicle, comprising the internal projection HUD system described in any one of the above embodiments.

[0075] It will be appreciated by those skilled in the art that, under the premise of no conflict, the above-mentioned preferred solutions can be freely combined and superimposed. Among them, the flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment, or a part of a code, and the module, program segment, or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings, for example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions. The numbering of each step in this article is only for the convenience of description and reference, and is not used to limit the order of execution. The specific execution order is determined by the technology itself, and those skilled in the art can determine various allowable and reasonable orders based on the technology itself.

[0076] Those skilled in the art will appreciate that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0077] It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will all be included in the scope of the claims of the present invention.

Claims

1. An internal projection HUD system, characterized in that: include: An image source (1) for emitting a light beam (3); A reflective imaging component (2) is arranged on a propagation path of the light beam (3) emitted by the image source (1), and the reflective imaging component (2) is arranged to directly receive the light beam (3) emitted by the image source (1), fold the light path of the light beam (3), and reflect the light beam (3) to a target position in the air so as to converge into a real image (4).

2. The internal projection HUD system according to claim 1, characterized in that: An eye box (5) is arranged at a set distance from the real image (4), and the real image (4) is suitable for entering a human eye through the eye box (5).

3. The internal projection HUD system according to claim 2, characterized in that: The reflective imaging component (2) comprises a first reflector (21) and a second reflector (22) for reflecting a light beam (3); at least one of the first reflector (21) and the second reflector (22) is also used for converging the light beam (3); the first reflector (21) is located in the light emitting direction of the image source (1); the second reflector (22) is located in the light beam (3) reflecting direction of the first reflector (21); the light beam (3) emitted by the image source (1) is reflected and converged by the first reflector (21) and the second reflector (22); the light beam (3) is then emitted by the second reflector (22) to form the real image (4) at a target position in the air.

4. The internal projection HUD system according to claim 2, characterized in that: The reflective imaging assembly (2) comprises a first reflector (21), a second reflector (22) and a third reflector (23) for reflecting a light beam (3); at least one of the first reflector (21), the second reflector (22) and the third reflector (23) is also used for converging the light beam (3); the first reflector (21) is located in the light emitting direction of the image source (1); the second reflector (22) is located in the light beam (3) reflection direction of the first reflector (21); the third reflector (23) is located in the light beam (3) reflection direction of the second reflector (22); and at the same time, the second reflector (22) is also located in the light beam (3) reflection direction of the third reflector (23); the image source (1 ), the light beam (3) emitted by the first reflector (21) and the second reflector (22) is reflected by the first reflector (21) and the second reflector (22), the light beam (3) reflected by the second reflector (22) is emitted to the third reflector (23), and is reflected by the third reflector (23) and then emitted back to the second reflector (22), and finally the light beam (3) is emitted to the air by the second reflector (22), and during the reflection process of the light beam (3), at least one of the first reflector (21), the second reflector (22) and the third reflector (23) converges the light beam (3), so that the light beam (3) emitted by the second reflector (22) forms the real image (4) at the target position in the air.

5. The internal projection HUD system according to claim 2, characterized in that: The reflective imaging component (2) comprises a first reflector (21) and a second reflector (22) for reflecting a light beam (3); at least one of the first reflector (21) and the second reflector (22) is also used for converging the light beam (3); the first reflector (21) is located in the light emitting direction of the image source (1); the second reflector (22) is located in the reflection direction of the light beam (3) of the first reflector (21); the reflection direction of the light beam (3) of the second reflector (22) points to the windshield (6); the light beam (3) emitted by the image source (1) is reflected and converged by the first reflector (21) and the second reflector (22); then the light beam (3) is emitted by the second reflector (22) to the inner concave surface of the windshield (6); the inner concave surface of the windshield (6) reflects the light beam (3) to the target position in the air to form the real image (4).

6. The internal projection HUD system according to any one of claims 3-5, characterized in that: The surface formulas of the first reflector (21), the second reflector (22) and the third reflector (23) are: Among them, r 2 =x 2 +y 2 , z represents the sagittal height difference in the Z-axis direction, c represents the curvature, k represents the conic surface constant, and m and n represent the orders of x and y respectively.

7. The internal projection HUD system according to claim 6, characterized in that: The ratio of the area of ​​the real image (4) to the light-emitting area of ​​the image source (1) is 1.5-2.

5.

8. The internal projection HUD system according to any one of claims 1-5, characterized in that: The target position of the real image (4) is located at the position of the vehicle's onboard instrument panel and / or the central control display screen.

9. A vehicle, characterized in that: An internal projection HUD system comprising any one of claims 1-8.

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