Head-up display system

Abstract

The application provides a head-up display system. The head-up display system comprises a first mirror and an imaging screen, the first mirror is used for receiving external light transmitted from the imaging screen, an angle between a central axis of the first mirror and a main optical axis of reflected light of the imaging screen is β, and an angle between the imaging screen and a horizontal plane is α; a light shield cover, an angle between a central axis of the light shield cover and the central axis of the first mirror is γ; wherein the angle β is adjusted according to the angle γ and the angle α, so that the first mirror reflects all the external light received by the first mirror to the light shield cover, and the light shield cover performs light extinction treatment on the light received by the light shield cover. The light shield cover of the application can receive all the external light reflected by the first mirror, avoids direct irradiation of the external light on the instrument panel cover, and completely avoids the instrument panel cover from emitting stray light.

Description

TECHNICAL FIELD

[0001] The embodiments of the present application relate to the field of head-up display technology, and more particularly, to a head-up display system. BACKGROUND

[0002] Nowadays, head-up display (HUD) has become a major product in the market. The display principle of the head-up display is usually that a backlight (TFT or DLP) system projects image light onto the automobile glass through multiple reflections, and the virtual image is displayed in front of the human eye through the windshield reflection.

[0003] At present, the popularization of the head-up display technology is facing an increasingly severe challenge - the light reflection problem of the vehicle instrument panel cover (IPC) is significantly aggravated. Although the traditional flocking scheme can effectively reduce the light hazard energy, it increases the cost and reduces the design degree of the vehicle instrument panel cover (IP cover).

[0004] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to provide a new technical solution for a head-up display system.

[0006] The embodiments of the present application provide a head-up display system. The head-up display system comprises:

[0007] a first mirror and an imaging screen, the first mirror is used for receiving external light transmitted from the imaging screen, the angle between the central axis of the first mirror and the principal axis of the reflected light of the imaging screen is β, and the angle between the imaging screen and the horizontal plane is α;

[0008] a light shield, the angle between the central axis of the light shield and the central axis of the first mirror is γ;

[0009] wherein the angle β is adjusted according to the angle γ and the angle α, so that the first mirror reflects all the external light it receives to the light shield, and the light shield performs light extinction on the light it receives.

[0010] Optionally, the head-up display system satisfies sin(β+A)≥sinα+sin(45+γ / 2), and A ranges from 20° to 30°.

[0011] Optionally, the head-up display system satisfies α=β+A=45°+γ / 2, and A ranges from 20° to 30°.

[0012] Optionally, an angle β between the first mirror central axis and a main optical axis of the reflected light of the imaging screen ranges from 45° to 55°.

[0013] Optionally, the head-up display system further comprises a second mirror configured to project image light to the second mirror; a distance between the first mirror and the second mirror is L3, and L3 satisfies L3≥L1 / 2+L2*sin(β-90)*sin(β) / 2.

[0014] L2 is a size of the first mirror in a vertical direction, and L1 is a horizontal distance of the light envelope from the imaging screen to the first mirror.

[0015] Optionally, the light shield is provided with light extinction components configured to perform light extinction on the light received by the light shield.

[0016] Optionally, the light extinction components are protruding components arranged in an array on the light shield, and two adjacent protruding components are configured to reflect the light received by the light shield at least twice to perform light extinction.

[0017] Optionally, a longitudinal cross-sectional shape of the protruding component is an isosceles or equilateral triangle, and when the longitudinal cross-sectional shape of the protruding component is an isosceles triangle, an apex angle of the isosceles triangle is less than 60°, and a length of each leg is greater than a length of a base.

[0018] Optionally, the head-up display system further comprises an instrument panel cover provided with a viewing window configured to allow the image light reflected by the first mirror to pass through.

[0019] Optionally, the head-up display system further comprises an image generation device configured to emit image light.

[0020] In the embodiments of the present application, according to the angle design of the vehicle imaging screen and the relative position relationship between the light shield and the first mirror, the angle between the central axis of the first mirror and the main optical axis of the reflected light of the imaging screen is adjusted, that is, through the cooperation of the imaging screen, the first mirror and the light shield, the external light received by the first mirror after reflection can be completely received and light-extinguished by the light shield, avoiding the external light reflected by the first mirror directly irradiating on the instrument panel cover, and completely avoiding the instrument panel cover emitting stray light. Since the external light will not be reflected to the instrument panel cover, the design freedom of the instrument panel cover can be improved.

[0021] Other features of the present application and their advantages will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0023] Figure 1 The diagram shows the optical path of external light entering an existing head-up display system.

[0024] Figure 2 The diagram shown is a structural schematic of the head-up display system provided in an embodiment of this application.

[0025] Figure 3 The diagram shows the optical path of external light entering the head-up display system provided in this embodiment of the application.

[0026] Figure 4 The diagram shown is a partial structural representation of the head-up display system provided in an embodiment of this application. Figure 1 .

[0027] Figure 5 The diagram shown is a partial structural representation of the head-up display system provided in an embodiment of this application. Figure 2 .

[0028] Figure 6 The diagram shown is a structural schematic of the matting component provided in an embodiment of this application. Figure 1 .

[0029] Figure 7 The diagram shown is a structural schematic of the matting component provided in an embodiment of this application. Figure 2 .

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Image generating device; 2. Second reflector; 3. First reflector; 4. Sunshade; 41. Protruding component; 5. Instrument panel cover; 6. Imaging screen; 7. Eye box; 8. Outer shell. Detailed Implementation

[0032] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0033] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0034] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0035] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0036] It should be noted that like reference numerals and letters refer to like items throughout the several views, and thus a discussion of the same in one view does not preclude discussion in another view.

[0037] The head-up display system mainly includes internal components (parts located inside the head-up display housing 8) and external components (parts located outside the head-up display housing 8), the internal components mainly include image generation device 1 (TFT / DLP display source), second mirror 2, first mirror 3 and light shield 4. The external components mainly include instrument panel cover 5 (IP cover) and imaging screen 6 (such as windshield). The image light path of the head-up display system is: the image light emitted by the image generation device 1 is reflected by the second mirror 2 to the first mirror 3, and then reflected by the first mirror 3 to the imaging screen 6, and finally reflected by the imaging screen 6 into the eyebox 7 range.

[0038] In the existing head-up display system, referring to Figure 1 , external light will pass through the imaging screen 6, pass through the first mirror 3 to the light shield 4 and the instrument panel cover 5 (IP cover) to form diffuse reflection and then enter the human eye through the imaging screen 6, forming stray light.

[0039] In order to solve this technical problem, at present, the flocked scheme is mainly used on the instrument panel cover 5 (IP cover) to reduce the light hazard energy, and the instrument panel cover 5 is set to a low-gloss material to reduce the light hazard energy. This solution increases the cost and reduces the design degree of the IP cover (since external light will pass through the IP cover, the design of the IP cover needs to be designed in combination with the light path).

[0040] Based on the above technical problems, the embodiment of the present application provides a head-up display system, based on the design of the imaging screen 6 arranged outside the head-up display housing 8, the relative position relationship of each optical component inside the head-up display housing 8 is adjusted to achieve the purpose of extinction of external light reflected by the first mirror 3 inside the head-up display housing 8. External light will not be transmitted to the instrument panel cover 5 outside the head-up display housing 8, so that external light will not be transmitted to the imaging screen 6 and then will not be reflected into the eyebox 7 range through the imaging screen 6.

[0041] Referring to Figures 2-5The head-up display system provided by the embodiments of the present application comprises a first reflector 3, an imaging screen 6 and a light shield 4. The first reflector 3 is used for receiving external light transmitted from the imaging screen 6. The angle between the central axis of the first reflector 3 and the main optical axis of the reflected light of the imaging screen 6 is β, and the angle between the imaging screen 6 and the horizontal plane is α. The angle between the central axis of the light shield 4 and the central axis of the first reflector 3 is γ.

[0042] The angle β is adjusted according to the angle γ and the angle α, so that the first reflector 3 reflects all the received external light to the light shield 4, and the light shield 4 performs light extinction on the received light.

[0043] In the embodiments of the present application, referring to Figure 4 , the head-up display system mainly comprises the first reflector 3, the imaging screen 6 and the light shield 4. The first reflector 3 and the light shield 4 are generally located inside the head-up display shell 8 as internal components, and the imaging screen 6 is located outside the head-up display shell 8 as an external component. In the head-up display system, the first reflector 3 is a reflector capable of directly projecting the reflected image light to the imaging screen 6.

[0044] In the structure of the head-up display system, referring to Figure 4 , the angle between the central axis of the first reflector 3 and the main optical axis of the reflected light of the imaging screen 6 is β. The angle between the central axis of the first reflector 3 and the main optical axis of the reflected light of the imaging screen 6 is defined as the off-axis angle of the first reflector 3 in the vertical direction, that is, the off-axis angle of the first reflector 3 in the vertical direction is β.

[0045] The head-up display system is applied to a vehicle structure. In a specific vehicle structure, the angle α between the imaging screen 6 and the horizontal plane is a determined parameter. Exemplarily, the imaging screen 6 can be a windshield. Exemplarily, according to the characteristics of the vehicle structure and the imaging requirements to be met, the angle α between the imaging screen 6 and the horizontal plane is generally within the range of 25° to 35°.

[0046] The angle between the central axis of the light shield 4 and the central axis of the first reflector 3 is γ. In order to ensure that the reflected external light of the first reflector 3 can be completely received by the light shield 4, the relative position relationship between the light shield 4 and the first reflector 3 is basically determined. Exemplarily, according to the light reflection and reception characteristics, the angle between the central axis of the light shield 4 and the central axis of the first reflector 3 is a small angle, so that the positions of the light shield 4 and the first reflector 3 are more matched. Exemplarily, the angle between the central axis of the light shield 4 and the central axis of the first reflector 3 is generally limited to 0° to 20°. In this way, the reflected external light deviates slightly from the central axis of the first reflector 3, but the external light can still fall within the shielding area of the light shield 4 to be received by the light shield 4.

[0047] In the embodiment of the present application, according to the angle γ between the central axis of the light shield 4 and the central axis of the first mirror 3, and the angle α between the imaging screen 6 and the horizontal plane, the angle β between the central axis of the first mirror 3 and the main optical axis of the reflected light of the imaging screen 6 can be adjusted, so that all external light is reflected by the first mirror 3 to the light shield 4, and the light shield 4 effectively absorbs and eliminates the reflected light, thereby significantly suppressing the generation of stray light on the instrument panel cover 5.

[0048] Since the external light reflected by the first mirror 3 is effectively guided and avoids being directly projected onto the instrument panel cover 5, we can choose a high-gloss material to make the instrument panel cover 5, which not only reduces the cost and improves the aesthetics, but also greatly enhances the design freedom and flexibility of the instrument panel cover 5.

[0049] Specifically, in the head-up display system, the instrument panel cover 5 is usually arranged at the front of the driver's cabin, close to the driver's line of sight, and ensures that the driver can conveniently view various information on the instrument panel. Exemplarily, the instrument panel cover 5 usually covers the surface of the instrument panel. It can also be understood that the arrangement position of the instrument panel cover 5 is basically fixed in the vehicle.

[0050] In the case that the arrangement position of the instrument panel cover 5 is basically fixed in the vehicle, in order to avoid the light reflected by the first mirror 3 from being projected onto the instrument panel cover 5, the embodiment of the present application adjusts the angle β between the central axis of the first mirror 3 and the main optical axis of the reflected light of the imaging screen 6 according to the angle design of the vehicle imaging screen 6 and the relative position relationship between the light shield 4 and the first mirror 3, that is, through the cooperation of the imaging screen 6, the first mirror 3 and the light shield 4, the external light received by the first mirror 3 from the imaging screen 6 can be completely received and light extinction processed by the light shield 4 after reflection, avoiding the external light reflected by the first mirror 3 from being directly irradiated onto the instrument panel cover 5, and completely avoiding the stray light emitted by the instrument panel cover 5. Since the external light will not be reflected onto the instrument panel cover 5, the design freedom of the instrument panel cover 5 can be improved, and a high-gloss material can be used to prepare the instrument panel cover 5, thereby reducing the cost.

[0051] In one specific embodiment, the head-up display system satisfies sin(β+A)≥sinα+sin(45+γ / 2), A ranges from 20° to 30°.

[0052] In this embodiment, in order to make the external light reflected by the first mirror 3 all project onto the light shield 4, the off-axis angle β of the first mirror 3 in the vertical direction is adjusted according to the angle γ between the central axis of the light shield 4 and the central axis of the first mirror 3 and the inclination angle of the imaging screen 6.

[0053] Specifically, by limiting sin(β+A)≥sinα+sin(45+γ / 2), A is a fixed coefficient, and the range of A is 20°-30°, which can increase the off-axis angle β of the first mirror 3 in the vertical direction. The value of A is used to fine-tune β, to ensure that the value of β can meet the requirement that the external light reflected by the first mirror 3 will not be reflected to the instrument panel cover 5 at all, so as not to introduce too much stray light. The value of A can vary between 20°-30°. Exemplarily, the value of A can be 20°, 23°, 25°, 26°, 28°, or 30°.

[0054] On the basis of the cooperation of the imaging screen 6, the first mirror 3 and the light shield 4 in transmitting external light, combined with the off-axis angle β of the first mirror 3 in the vertical direction after adjustment, all external light can be reflected by the first mirror 3 to the light shield 4, and will not be transmitted to the instrument panel cover 5. The main reason that sin(β+A)≥sinα+sin(45+γ / 2) and A ranges from 20° to 30° can make the external light reflected by the first mirror 3 all project onto the light shield 4 is that:

[0055] 1) According to the law of optical reflection, light will be reflected at a specific angle when it encounters a reflecting surface. Increasing the off-axis angle β of the first mirror 3 in the vertical direction means increasing the angle between the central axis of the first mirror 3 and the principal axis of the reflected light of the imaging screen 6. When the external light is incident on the first mirror 3, the external light will be reflected according to the reflection law, and the direction of reflection is determined by the inclination angle (i.e. off-axis angle) of the mirror. Since the setting position of the instrument panel cover 5 is basically determined, increasing the off-axis angle of the first mirror 3 in the vertical direction makes the external light reflected by the first mirror 3 not be reflected to the instrument panel cover 5 at all, but based on the relative position relationship between the first mirror 3 and the light shield 4, the external light reflected by the first mirror 3 is reflected to the light shield 4.

[0056] In short, according to the law of optical reflection, increasing the off-axis angle of the first mirror 3 in the vertical direction will change the path of the reflected light. The light that would have projected onto the instrument panel cover 5 is all directed to the light shield 4 due to the change in the off-axis angle of the first mirror 3 in the vertical direction.

[0057] 2) The light shield 4 is designed to receive and absorb light from a specific direction to prevent the light from entering the driver's line of sight or interfering with the display effect of the HUD system. Through precise calculation and design, the position and shape of the light shield 4 can be matched with the reflection angle of the first mirror 3 to ensure that the reflected light is effectively received by the light shield 4.

[0058] Exemplarily, the off-axis angle β of the first mirror 3 in the vertical direction is related to the tilt angle α of the imaging screen 6 and the relative position angle γ of the light shield 4 and the first mirror 3. In a specific vehicle structure, the tilt angle α of the imaging screen 6 is determined. In order to ensure that the light reflected by the first mirror 3 can be completely received by the light shield 4, the relative position angle γ of the light shield 4 and the first mirror 3 reflects the matching degree of the light shield 4 and the first mirror 3. In the case of sin(β+A)≥sinα+sin(45+γ / 2), A ranges from 20° to 30°, the light reflected by the first mirror 3 can be completely received by the light shield 4.

[0059] In an alternative embodiment, the first mirror 3 can be arranged vertically (i.e. the first mirror 3 is approximately perpendicular to the horizontal plane) to increase the off-axis angle β of the first mirror 3 in the vertical direction.

[0060] In another specific embodiment, referring to Figure 4 and Figure 5 , the HUD system also satisfies: α=β+A=45°+γ / 2, A ranges from 20° to 30°.

[0061] In this embodiment, another specific embodiment for determining the off-axis angle of the first mirror 3 in the vertical direction is provided.

[0062] Specifically, α is the tilt angle of the imaging screen 6 relative to the horizontal plane, which is a known value for a fixed vehicle structure. A is a fixed coefficient, and the value of A is used to fine-tune β to ensure that the value of β can meet the requirement that the light reflected by the first mirror 3 will not be reflected to the instrument cover 5, so as not to introduce too much stray light. The value of A can vary between 20° and 30°. Exemplarily, the value of A can be 20°, 23°, 25°, 26°, 28°, 30°.

[0063] It can also be understood that α is the main variable, which changes according to the tilt angle of the imaging screen 6 of the vehicle, and the off-axis angle β of the first mirror 3 in the vertical direction changes with α.

[0064] In the case of determining the value of a, the off-axis angle β of the first mirror 3 in the vertical direction can be determined according to a = β + A. Since the external light reflected by the first mirror 3 needs to be reflected to the light shield 4 for light extinction treatment, in the case of determining the off-axis angle β of the first mirror 3 in the vertical direction, the angle γ between the central axis of the light shield 4 and the central axis of the first mirror 3 can be determined according to β + A = 45° + γ / 2. Alternatively, in the case of determining the value of a, the angle γ between the central axis of the light shield 4 and the central axis of the first mirror 3 can be determined according to a = 45° + γ / 2.

[0065] In one embodiment, referring to Figure 4 and Figure 5 , the angle β between the central axis of the first mirror 3 and the principal axis of the reflected light of the imaging screen 6 ranges from 45° to 55°

[0066] In this embodiment, the off-axis angle β of the first mirror 3 in the vertical direction is limited. The off-axis angle β of the first mirror 3 in the vertical direction in the embodiment of the application is about 20° to 30° larger than that in the conventional scheme. The path of the external light reflected by the first mirror 3 can be optimized, that is, the external light reflected by the first mirror 3 will not be transmitted to the instrument panel cover 5, but will be received by the light shield 4 for light extinction, so as to achieve the purpose of reducing light damage.

[0067] In a further embodiment, referring to Figure 4 and Figure 5 , the head-up display system further comprises a second mirror 2, the second mirror 2 is used for projecting image light to the first mirror 3; the distance between the first mirror 3 and the second mirror 2 is L3, L3 satisfies: L3 ≥ L1 / 2 + L2*sin(β-90)*sin(β) / 2;

[0068] wherein, L2 is the size of the first mirror 3 in the vertical direction, and L1 is the horizontal distance of the light envelope from the imaging screen 6 to the first mirror 3.

[0069] In the head-up display system, the off-axis angle β of the first mirror 3 in the vertical direction is adjusted according to the above embodiments, specifically, the off-axis angle β of the first mirror 3 in the vertical direction is increased compared with the existing scheme. In the case of increasing the off-axis angle β of the first mirror 3 in the vertical direction, the optical path from the first mirror 3 to the second mirror 2 can be shortened, and the volume of the head-up display system can be reduced. That is, the first mirror 3 is designed with a large off-axis angle, the optical path from the first mirror 3 to the second mirror 2 is shortened, and the size of the head-up display system in the horizontal direction (X direction) and the vertical direction (Z direction) is reduced, so as to achieve the purpose of reducing the volume of the head-up display system, specifically, the purpose of reducing the volume of the internal components of the head-up display system.

[0070] Specifically, as the off-axis angle β in the vertical direction of the first reflector 3 gradually increases, the overlapping area of ​​the light envelopes of the first reflector 3 and the second reflector 2 gradually decreases, thereby reducing the size of the internal components of the head-up display system. This can also be understood as: the overlapping area of ​​the light envelopes of the first reflector 3 and the second reflector 2 (…) Figure 5 Interference with the area marked with a diagonal line corresponding to the second reflecting mirror 2, and interference with the light envelope area of ​​the second reflecting mirror 2 that does not interact with the first reflecting mirror 3. Figure 5 In the event of interference (the area corresponding to the diagonal line drawn in the first reflector 3), the first reflector 3 and the second reflector 2 will tend to approach each other in the horizontal direction and also tend to approach each other in the vertical direction, in order to reduce the volume of the internal components of the head-up display.

[0071] In this embodiment, L3 is defined as ≥ L1 / 2 + L2*sin(β-90)*sin(β) / 2, where the optical path L3 between the first reflector 3 and the second reflector 2 is related to the vertical dimension L2 of the first reflector 3, the vertical off-axis angle β of the first reflector 3, and the horizontal distance L1 of the light envelope from the imaging screen 6 to the first reflector 3. The vertical off-axis angle β of the first reflector 3 increases within a range less than 90°. As the vertical off-axis angle β of the first reflector 3 gradually increases, L3 actually shows a gradual decreasing trend. Thus, by increasing the vertical off-axis angle β of the first reflector 3, the size of the head-up display system can be reduced.

[0072] Preferably, L3 = L1 / 2 + L2*sin(β-90)*sin(β) / 2. When the light envelope regions of the first reflector 3 and the second reflector 2 do not interfere with each other, increasing the off-axis angle β in the vertical direction of the first reflector 3 can reduce the size of the head-up display system. Furthermore, this embodiment also limits L3 to a value greater than L1 / 2 + L2*sin(β-90)*sin(β) / 2. Without affecting light transmission, L3 can actually be slightly larger than L1 / 2 + L2*sin(β-90)*sin(β) / 2. Additionally, based on the internal structural dimensions of the head-up display housing 8, the size of L3 should not be too large.

[0073] In one embodiment, refer to Figure 2-3 ,as well as Figure 6 and Figure 7 The light shield 4 is provided with a light-absorbing component, which is used to absorb light received by the light shield 4.

[0074] In this embodiment, the external light rays reflected by the first mirror 3 will all be received by the light shield 4. The light shield 4 is configured to block or limit the projection of external light rays out of the HUD housing 8, so as to protect the instrument panel cover 5 and the imaging screen 6 from unnecessary light interference. The light shield 4 is provided with light extinction components.

[0075] The light extinction components are responsible for light extinction processing of the light rays received by the light shield 4. This generally means that the light extinction components can absorb, reflect or scatter the unnecessary light rays, thereby reducing the interference with the HUD image.

[0076] Exemplarily, the material of the light extinction components can be defined so that the light extinction components have good light absorption and stability. Common light extinction materials include black or other dark-colored plastics, fabrics or films, which can effectively absorb light.

[0077] Exemplarily, the structure of the light extinction components can be defined so that the light extinction components can achieve multiple reflections for light extinction purposes. For example, the light extinction components can be designed as thin sheets, grid structures or raised structures that closely fit the light shield 4, so as to ensure that they can effectively eliminate excess external light.

[0078] Please continue to refer to Figures 2-3 , and Figure 6 , and Figure 7 In a specific embodiment, the light extinction components are raised components 41 arranged in an array on the light shield 4. Adjacent two of the raised components 41 are configured to reflect the light rays received by the light shield 4 at least twice for light extinction processing.

[0079] In this embodiment, when external light rays shine on the light shield 4, the light rays will encounter the raised components 41. Due to the array arrangement of the raised components 41, the light rays will be reflected at least twice between adjacent two of the raised components 41. This multiple reflection mechanism effectively prolongs the propagation path of the light rays and increases the chance of light absorption or scattering.

[0080] Specifically, through multiple reflections, the raised components 41 can convert light rays that might have directly penetrated the light shield 4 or interfered with the HUD image into more dispersed and weaker light rays. These dispersed light rays will eventually be absorbed or scattered by other parts of the light shield 4, thereby significantly reducing the interference with the HUD image.

[0081] In a specific embodiment, the longitudinal cross-sectional shape of the raised components 41 is an isosceles or equilateral triangle. When the longitudinal cross-sectional shape of the raised components 41 is an isosceles triangle, the top angle of the isosceles triangle is less than 60°, and the length of each leg is greater than the length of the base.

[0082] Referring toFigure 6 When the longitudinal cross-sectional shape of the convex component 41 is an isosceles triangle, the vertex angle is designed to be less than 60°. This design enables the light to form a sharper angle when reflected between two adjacent convex components 41, thereby increasing the number of reflections and path length of the light inside the light shield 4.

[0083] The length of each leg is designed to be greater than the length of the base. This design not only enhances the structural stability of the convex component 41, but also makes it easier for the light to be dispersed and absorbed during reflection. The longer leg provides a larger reflection area, which helps to increase the chances of the light coming into contact with the convex component 41, thereby improving the light extinction effect.

[0084] That is, when the longitudinal cross-sectional shape of the convex component 41 is an isosceles triangle, the vertex angle of the isosceles triangle is less than 60°, and the length of each leg is greater than the length of the base, the first reflecting mirror 3 reflects the light to form two or more (more than two) reflections under this structure, thereby reducing the light hazard energy.

[0085] Reference Figure 7 When the longitudinal cross-sectional shape of the convex component 41 is an isosceles triangle, in the case of an isosceles triangle, the lengths of the three sides are equal, and each internal angle is 60°, the first reflecting mirror 3 reflects the light to form two reflections under this structure, thereby reducing the light hazard energy.

[0086] It should be noted that the longitudinal cross-sectional shape of the convex component 41 includes but is not limited to the shape defined above, for example, the longitudinal cross-sectional shape of the convex component 41 can also be other polygons, as long as it can achieve at least two reflections of external light.

[0087] In one embodiment, with reference to Figures 2-5 , the head-up display system further comprises an instrument panel cover 5, the instrument panel cover 5 is provided with a visible window, the visible window is configured to allow the image light reflected by the first reflecting mirror 3 to pass through.

[0088] In this embodiment, the head-up display system includes an instrument panel cover 5, which is placed outside the head-up display housing 8. In the embodiment of the present application, the external light reflected by the first reflecting mirror 3 will not be transmitted to the instrument panel cover 5, so that the visible window opened on the instrument panel cover 5 can be designed freely based on human factors, without considering the light path factors of external light, improving the design freedom of the IP cover rear end of the whole vehicle. And the instrument panel cover 5 can be made of high-gloss material, reducing the material use cost of the IP cover of the whole vehicle.

[0089] In addition, the main function of the visible window is to allow the image light reflected by the first mirror 3 to pass through. In the HUD system, the image light is emitted by the image generation device 1, and after being reflected by the first mirror 3, it needs to pass through the visible window to continue to be projected onto the imaging screen 6. Through this design, the HUD system can accurately project the image light onto the windshield in front of the driver's line of sight to form a clear virtual image, thereby providing driving-related information.

[0090] In one embodiment, the head-up display system further comprises an image generation device 1 for emitting image light.

[0091] In this embodiment, the head-up display system also needs to include an image generation device 1 for emitting image light, which can include one or more light sources (such as LEDs, lasers, etc.), an image processor (for generating image data), and a display screen. The light emitted by the display screen is reflected by the second mirror 2 and the first mirror 3 in turn to the imaging screen 6 (which is a transparent medium and can be a windshield), and due to the transparency and specific optical properties of the imaging screen 6, the light is reflected on the windshield, and finally a clear virtual image is formed in front of the driver's line of sight.

[0092] The above embodiments mainly describe the differences between the various embodiments, and the different optimization features between the various embodiments can be combined to form a more optimal embodiment as long as they are not contradictory. In view of the brevity of the writing, it will not be repeated here.

[0093] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and are not intended to limit the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A heads-up display system, characterized by, The head-up display system comprises: a first mirror (3) and an imaging screen (6), the first mirror (3) is a lens for directly reflecting image light to the imaging screen (6), the first mirror (3) is used for receiving external light transmitted from the imaging screen (6), an angle between a central axis of the first mirror (3) and a principal axis of reflected light of the imaging screen (6) is β, and an angle between the imaging screen (6) and a horizontal plane is α; a light shield (4), an angle between a central axis of the light shield (4) and the central axis of the first mirror (3) is γ; wherein the angle β is adjusted according to the angle γ and the angle α, so that the first mirror (3) reflects all the external light received by the first mirror (3) to the light shield (4), the light shield (4) performs light extinction processing on the light received by the light shield (4), and the head-up display system satisfies sin(β+A)≥sinα+sin(45+γ / 2), A ranges from 20° to 30°; or the head-up display system satisfies α=β+A=45°+γ / 2, A ranges from 20° to 30°.

2. The head-up display system of claim 1, wherein, The angle β between the central axis of the first mirror (3) and the principal axis of the reflected light of the imaging screen (6) ranges from 45° to 55°.

3. The head-up display system of claim 1, wherein, The head-up display system further comprises a second mirror (2), the second mirror (2) is used for projecting image light to the first mirror (3), a distance between the first mirror (3) and the second mirror (2) is L3, and L3 satisfies L3≥L1 / 2+L2*sin(β-90)*sin(β) / 2. L2 is a size of the first mirror (3) in a vertical direction, and L1 is a horizontal distance of light envelope from the imaging screen (6) to the first mirror (3).

4. The head-up display system of claim 1, wherein, The light shield (4) is provided with a light extinction component, and the light extinction component performs light extinction processing on the light received by the light shield (4).

5. The head-up display system of claim 4, wherein, The light extinction component is a convex component (41) arranged in an array on the light shield (4), and two adjacent convex components (41) are configured to reflect the light received by the light shield (4) at least twice to perform light extinction processing.

6. The head-up display system of claim 5, wherein, A longitudinal cross-sectional shape of the convex component (41) is an isosceles or equilateral triangle, wherein when the longitudinal cross-sectional shape of the convex component (41) is an isosceles triangle, an apex angle of the isosceles triangle is less than 60°, and a length of each leg is greater than a length of a base.

7. The head-up display system of claim 1, wherein, The head-up display system further comprises an instrument panel cover (5), the instrument panel cover (5) is provided with a visible window, and the visible window is configured to allow the image light reflected by the first mirror (3) to pass through.

8. The head-up display system of claim 1, wherein, The head-up display system further comprises an image generation device (1), and the image generation device (1) is used for emitting image light.

Images