Projection assembly, vehicle lamp module and vehicle

Abstract

The invention relates to an optical element, in particular to a projection assembly which comprises a display module and a projection visual angle compression ratio adjusting element, and the projection visual angle compression ratio adjusting element is configured to be capable of adjusting the compression ratio of a projection image formed by the display module. In addition, the invention further relates to a vehicle lamp module and a vehicle. According to the projection assembly, the compression ratio can be adjusted, the energy utilization rate is improved, the brightness and resolution of a projected image are improved, and the projected image is clearer.

Description

Technical Field

[0001] The present invention relates to an optical element, and in particular to a projection assembly. Furthermore, the present invention relates to a vehicle lamp module and a vehicle. Background Art

[0002] With the development of the automotive lighting industry, single-use road lighting can no longer meet the needs of traffic participants for safe and comfortable lighting. The demand for human-vehicle interaction and human-to-human information interaction is also increasing. New intelligent automotive lighting systems that implement matrix lighting and pixel display are gradually being applied to automobiles.

[0003] Existing solutions include high-pixel MATRIX (matrix) module solutions based on DLP (digital light processing) or LCD, which have a small resolution angle and can achieve continuously changing pixel lighting. They can provide softer light pattern changes and, combined with different road conditions, achieve high-pixel lighting and display at the same time. Another technical solution is to continuously divide the entire headlamp lighting space into different blocks, each block using a different number of array LEDs to achieve pixel lighting and display. However, no matter which of the above display modules is used, the size ratio of its display unit has certain limitations, which is inconsistent with the actual road lighting ratio. Part of the viewing angle in the vertical direction of the vehicle body is invalid, resulting in relatively low pixel resolution, waste of energy, and relatively low main body brightness, which makes it difficult to fully meet the needs of automobile road lighting and display. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a projection assembly that can adjust the magnification in the meridian direction and / or sagittal direction, which is conducive to fully utilizing the energy of the light source and improving the brightness and resolution of the projection pattern.

[0005] Furthermore, the technical problem to be solved by the present invention is to provide a headlight module, which can adjust the magnification of the headlight projection in the meridian direction and / or sagittal direction, so as to meet the viewing angle requirements of the meridian plane and sagittal plane of road lighting, more effectively utilize the display unit, improve the illumination within the effective lighting range of the road surface and the resolution of the headlight projection, and has a small size and is easy to operate.

[0006] Furthermore, the technical problem to be solved by the present invention is to provide a vehicle that can adjust the magnification of the headlight projection in the meridian direction and / or sagittal direction to meet the viewing angle requirements of the meridian plane and sagittal plane of road lighting, more effectively utilize the display unit, improve the illumination within the effective lighting range of the road surface and the resolution of the headlight projection, and has a small size and is easy to operate.

[0007] In order to solve the above technical problems, the present invention provides a projection assembly, which includes a display module and a projection viewing angle compression ratio adjustment element, wherein the projection viewing angle compression ratio adjustment element is configured to adjust the magnification of the projection image formed by the display module in the meridian direction and / or sagittal direction.

[0008] Specifically, the projection viewing angle compression ratio adjustment element is a prism group, which includes a plurality of prisms arranged along the optical path, and each of the prisms is configured to rotate relative to each other, wherein when adjusting the magnification in the meridional direction, at least part of the prisms is controlled to rotate in the meridional plane, and when adjusting the magnification in the sagittal direction, at least part of the prisms is controlled to rotate in the sagittal plane.

[0009] Preferably, the prism group includes a first prism and a second prism, and the first prism and the second prism are achromatic prisms.

[0010] Specifically, the first prism and the second prism are arranged so that the magnification of the prism group in the meridional direction is smaller than the magnification in the sagittal direction.

[0011] Specifically, the calculation formula for the deflection angle δ2 of the optical axes of the outgoing light beam emitted from the prism group and the light source light beam emitted from the display unit is:

[0012]

[0013] Wherein, θ1 is the deflection angle of the first prism, θ2 is the deflection angle of the second prism, n1 is the refractive index of the first prism, n2 is the refractive index of the second prism, α1 is the vertex angle of the first prism, and α2 is the vertex angle of the second prism.

[0014] Preferably, the two achromatic prisms have the same refractive index and / or vertex angle.

[0015] Preferably, the display module includes a display unit and a magnifying imaging system, the magnifying imaging system is arranged between the display unit and the projection viewing angle compression ratio adjustment element, and the magnification of the magnifying imaging system in the tangential direction and the sagittal direction is set to a predetermined value.

[0016] Specifically, the magnifying imaging system includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence, the first lens is a plano-concave lens, the second lens is a convex lens, the third lens is a convex-concave lens, and the fourth lens is a convex lens. The first lens light-emitting surface of the first lens and the second lens light-entrance surface of the second lens have the same surface shape, the third lens light-emitting surface of the third lens and the fourth lens light-entrance surface of the fourth lens have the same surface shape when attached together, the first lens and the second lens are spherical lenses, and the front and back surfaces of the third lens and the fourth lens are both rotationally symmetric aspherical surfaces. The first lens, the second lens, the third lens and the fourth lens are arranged in sequence in the direction of the optical path.

[0017] Preferably, the first lens and the second lens are glass lenses, and the third lens and the fourth lens are plastic lenses.

[0018] Preferably, the first lens and the second lens form a doublet lens.

[0019] Specifically, the third lens includes a protruding third lens light entrance surface and a concave third lens light exit surface, the fourth lens includes a protruding fourth lens light entrance surface and a protruding fourth lens light exit surface, the third lens light entrance surface, the third lens light exit surface, the fourth lens light entrance surface, and the fourth lens light exit surface are all even-order aspheric surfaces, and the surface equations of the third lens light entrance surface, the third lens light exit surface, the fourth lens light entrance surface, and the fourth lens light exit surface are:

[0020]

[0021] Among them, Z is the surface height, r is the radial radius coordinate of the surface, c is the curvature of the surface, k is the quadratic surface coefficient, α1, α2, α3, α4, α5, α6, α7, and α8 are the higher-order coefficients of the even-order aspheric surface respectively.

[0022] On the basis of the above-mentioned technical solutions of the projection assembly, the present invention further provides a vehicle light module, which includes the projection assembly of any of the above-mentioned technical solutions.

[0023] Based on the above-mentioned technical solutions of the projection assembly and the vehicle light module, the present invention further provides a vehicle, which includes the projection assembly or the vehicle light module of any of the above-mentioned technical solutions.

[0024] Through the above technical solution, the magnification of the projection viewing angle compression ratio adjustment element of the projection assembly of the present invention in the meridian direction and / or sagittal direction can be adjusted according to actual needs, so that the compression ratio of the projection image formed by the display module can be changed according to actual needs, and then the projection image formed by the display module can be compressed according to the effective viewing angle range, so that the energy of the light source is fully utilized, the brightness and resolution of the projection image are improved, and the image is clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view of a projection assembly according to a specific embodiment of the present invention;

[0026] Figure 2 is a schematic structural diagram of a projection assembly according to a specific embodiment of the present invention;

[0027] Figure 3 1 is a schematic diagram of the light path in the sagittal direction of the projection assembly according to a specific embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the optical path in the meridian direction of the projection assembly according to a specific embodiment of the present invention;

[0029] Figure 5 This is a simulation diagram of the projection effect of the projection assembly according to a specific embodiment of the present invention;

[0030] Figure 6 Schematic diagram of a first prism and a second prism according to a specific embodiment of the present invention.

[0031] Description of Reference Numerals

[0032] 1Display unit 2First lens

[0033] 201 first lens light incident surface 202 first lens light exit surface

[0034] 3 Second lens 301 Second lens light incident surface

[0035] 302 Second lens light exit surface 4 Third lens

[0036] 401 light incident surface of the third lens 402 light exit surface of the third lens

[0037] 5Fourth lens 501 Fourth lens light incident surface

[0038] 502 fourth lens light exit surface 6 first prism

[0039] 7 Second Prism DETAILED DESCRIPTION

[0040] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are intended to illustrate the principles of the present invention, but are not intended to limit the scope of the present disclosure. The present invention can be implemented in many different forms and is not limited to the specific embodiments of the invention herein, but includes all technical solutions within the scope of the claims.

[0041] The present invention provides these embodiments to make the present invention thorough and complete, and fully express the scope of the present invention to those skilled in the art.It should be noted that: unless otherwise specifically stated, the relative arrangement of parts, composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0042] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is greater than or equal to two; "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. In addition, it should be explained that the meridian plane refers to the plane formed by the main ray of the off-axis object point and the main axis of the optical system; the sagittal plane refers to the plane perpendicular to the meridian plane; the compression ratio refers to the ratio of the magnification in the sagittal direction to the magnification in the meridian direction.

[0043] It should also be noted that in the description of the present invention, unless otherwise clearly stipulated and limited, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0044] All terms used herein have the same meanings as understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0046] like Figure 1As shown, the projection assembly of the present invention includes a display module and a projection viewing angle compression ratio adjustment element. The magnification of the projection viewing angle compression ratio adjustment element in the meridian direction and / or sagittal direction can be adjusted according to actual needs, so that the projection viewing angle compression ratio adjustment element can adjust the compression ratio of the projected image formed by the display module, so that the projected image is compressed in the meridian direction or sagittal direction, so that the projected image completely falls within the effective viewing angle range, thereby improving the energy utilization rate of the display module, and also improving the brightness and resolution of the projected image, making the image clearer.

[0047] As a specific implementation method, Figure 1 As shown, the projection viewing angle compression ratio adjustment element is a prism group, which includes a plurality of prisms arranged along the light path direction, and each prism is configured to be rotatable relative to each other. By controlling at least part of the prisms in the prism group to rotate in the meridian plane, the magnification of the projection assembly in the meridian direction is adjusted. By controlling at least part of the prisms in the prism group to rotate in the sagittal plane, the magnification of the projection assembly in the sagittal direction is adjusted. Therefore, by controlling the rotation angle of the prism, the deflection angle of the prism can be changed, thereby changing the deflection angle of the output light beam emitted from the projection viewing angle compression ratio adjustment element and the light source light beam emitted from the light source, so that the magnification of the viewing angle compression ratio adjustment element in the meridian direction and / or sagittal direction changes continuously, thereby realizing a projection picture with a continuously changing compression ratio.

[0048] As a specific implementation method, Figures 1 to 4 As shown, the prism group includes two prisms. In some preferred embodiments, the two prisms are achromatic prisms. The use of achromatic prisms can reduce the chromatic aberration of the projection assembly and improve the quality of the projected image. In some specific embodiments, the two prisms are glass prisms to meet the matching of achromatic materials. In this embodiment, the deflection angle of the prism is changed by adjusting the rotation angle of the two prisms, thereby adjusting the magnification of the projected image in the meridian direction, so that the projected image is compressed in the meridian direction, so that the projected image meets the requirements of the effective viewing angle range of the illumination, improves the brightness and resolution of the projected image within the effective viewing angle range, makes the image clearer, and has a simple structure and is easy to operate. In some specific embodiments, the prism will interfere with other parts during the process of adjusting the rotation angle of the prism, so that the prism needs to be moved while rotating the prism to avoid the prism from getting stuck or damaged.

[0049] As a specific implementation, the two achromatic prisms are configured so that the magnification in the meridional direction is smaller than the magnification in the sagittal direction, thereby achieving compression of the projected image in the meridional direction. In some specific embodiments, the projection assembly can compress the projected image to a certain extent in the vertical direction of the vehicle body, so that the projected image falls completely within the effective viewing angle range, ensuring that the light source energy is not wasted outside the effective viewing angle range, and ensuring that the resolution and brightness of the road lighting display are improved while not causing heat dissipation and heat resistance problems.

[0050] In order to facilitate the determination of the rotation angle of the prism when adjusting the compression ratio of the projection assembly, and to facilitate the adjustment of the compression ratio of the projection assembly, in a specific embodiment of the present invention, the two prisms are a first prism 6 and a second prism 7, and the calculation formula for the deflection angle δ2 of the optical axis of the outgoing light beam emitted from the prism group and the light source light beam emitted from the display unit 1 is:

[0051]

[0052] Among them, such as Figure 6 As shown, θ1 is the deflection angle of the first prism 6, θ2 is the deflection angle of the second prism 7, n1 is the refractive index of the first prism 6, n2 is the refractive index of the second prism 7, α1 is the vertex angle of the first prism 6, α 2为 The vertex angle of the second prism 7.

[0053] As a preferred embodiment, the first prism 6 and the second prism 7 are prisms with the same refractive index and / or vertex angle. In some preferred embodiments, the first prism 6 and the second prism 7 can be the same prism to reduce the number of parts to be processed and save processing costs. The calculation formula of the deflection angle δ2 in this embodiment is:

[0054]

[0055] Wherein, θ1 is the deflection angle of the first prism 6 , θ2 is the deflection angle of the second prism 7 , n is the refractive index of the first prism 6 and the second prism 7 , and α is the vertex angle between the first prism 6 and the second prism 7 .

[0056] As a preferred embodiment, Figures 1 to 5As shown, the display module includes a display unit 1 and a magnifying imaging system. The display unit 1 is the image source of the projection component, and can adopt an array LED, Micro-LED, DMD (digital micromirror system) or other light source capable of emitting a regular pattern. The magnifying imaging system is arranged between the display unit 1 and the projection viewing angle compression ratio adjustment element. The magnification of the magnifying imaging system in the meridian plane and in the sagittal plane is set to a predetermined value. The predetermined value is set according to actual needs so that the magnifying imaging system can perform a certain degree of preliminary magnification on the display unit 1 in the sagittal direction and the meridian direction. The magnification of the magnifying imaging system in the meridian plane and the sagittal plane can be different. In this embodiment, the magnification of the magnifying imaging system in the sagittal direction and the meridian direction is the same, and then the magnified image is compressed in the meridian direction through the prism group, and adjusting the deflection angle of the prism can continuously change the compression degree of the projected image in the meridian direction, thereby realizing a projection image with a continuously changing compression ratio.

[0057] In some specific embodiments, such as Figures 1 to 4 As shown, the magnifying imaging system includes a first lens 2, a second lens 3, a third lens 4 and a fourth lens 5 arranged in sequence, the first lens 2 is a plano-concave lens, the second lens 3 is a convex lens, the third lens 4 is a convex-concave lens, and the fourth lens 5 is a convex lens. The first lens light-emitting surface 202 of the first lens 2 and the second lens light-entrance surface 301 of the second lens 3 have the same surface shape, the third lens light-emitting surface 401 of the third lens 4 and the fourth lens light-entrance surface 501 of the fourth lens 5 have the same surface shape, the first lens 2 and the second lens 3 are spherical lenses, and the front and back surfaces of the third lens 4 and the fourth lens 5 are both rotationally symmetric aspherical surfaces. This embodiment uses a lens group to form a magnifying imaging system with the same magnification in the meridional direction and the sagittal direction. The rotationally symmetric aspherical surface can increase the degree of freedom of the surface shape, facilitate the creation of more complex lens surfaces, achieve better surface quality of optical elements, and has low processing difficulty and cost.

[0058] As a preferred embodiment, the first lens 2 and the second lens 3 are glass lenses, and the third lens 4 and the fourth lens 5 are plastic lenses. The first lens 2 and the second lens 3 are close to the display unit 1. The first lens 2 and the second lens 3 are made of glass material with high temperature resistance to prevent the first lens 2 and the second lens 3 from being deformed and damaged by the heat emitted by the display unit 1, thereby preventing the imaging quality from being affected. The third lens 4 and the fourth lens 5 are made of plastic lenses. Plastic lenses are relatively low in cost and can reduce processing difficulty and cost. The light-transmitting plastic can be a conventional optical plastic, such as polypropylene, polystyrene, polycarbonate, propylene-ethylene-acrylonitrile copolymer, or other optical plastics.

[0059] As a preferred embodiment, Figure 2As shown, the first lens 2 and the second lens 3 form a doublet lens to improve the light transmittance of the optical system and ensure the clarity and brightness of the projected image.

[0060] In order to facilitate the search for the optical center position of the third lens 4 and the fourth lens 5 during processing, and facilitate the processing of the third lens 4 and the fourth lens 5, in a specific embodiment of the present invention, as shown in FIG. Figure 2 As shown, the third lens element 4 includes a protruding third lens light incident surface 401 and a recessed third lens light exit surface 402. The fourth lens element 5 includes a protruding fourth lens light incident surface 501 and a protruding fourth lens light exit surface 502. The third lens light incident surface 401, the third lens light exit surface 402, the fourth lens light incident surface 501, and the fourth lens light exit surface 502 are all even-order aspheric surfaces. The surface equations of the third lens light incident surface 401, the third lens light exit surface 402, the fourth lens light incident surface 501, and the fourth lens light exit surface 502 are:

[0061]

[0062] Among them, Z is the surface height, r is the radial radius coordinate of the surface, c is the curvature of the surface, k is the quadratic surface coefficient, α1, α2, α3, α4, α5, α6, α7, and α8 are the higher-order coefficients of the even-order aspheric surface respectively.

[0063] On the basis of the above technical solution of the present invention, the present invention provides a specific projection component, such as Figures 1 to 4 As shown, the projection assembly of this embodiment includes a display unit 1, a lens group, and a prism group. The display unit 1 uses a 32×32 pixel Micro-LED. The lens group includes a first lens 2, a second lens 3, a third lens 4, and a fourth lens 5 arranged in sequence along the light path. In order to more intuitively demonstrate the technical effect of the projection assembly of the present invention, Table 1 gives the specific values ​​of the various parameters of the lens group and the prism group of this embodiment:

[0064] Table 1

[0065]

[0066] Wherein, the spacing represents the center distance from the current surface to the next surface along the optical axis, and the semi-aperture is the effective semi-aperture of the optical surface. This embodiment is a relatively preferred embodiment. In some other embodiments, the above parameters can be adjusted within a certain range, with the curvature radius parameter adjustment range being ±5mm, the spacing adjustment range being ±2mm, the refractive index adjustment range being ±0.2mm, the Abbe coefficient adjustment range being ±5, and the semi-aperture adjustment range being ±2mm. This application is not limited to these parameters.

[0067] The first lens 2 and the second lens 3 are double-cemented glass lenses, so that the light exit surface 202 of the first lens and the light incident surface 301 of the second lens coincide with each other and have the same surface shape. The first lens 2 is a plano-concave lens, and the second lens 3 is a convex lens. The first lens 2 and the second lens 3 are spherical mirrors.

[0068] The third lens 4 and the fourth lens 5 are plastic lenses. The third lens light incident surface 401, the third lens light exit surface 402, the fourth lens light incident surface 501 and the fourth lens light exit surface 502 are all even-order aspherical surfaces. The surface equations of the third lens 4 and the fourth lens 5 are:

[0069]

[0070] Among them, Z is the surface height, r is the radial radius coordinate of the surface, c is the curvature of the surface, k is the quadratic surface coefficient, α1, α2, α3, α4, α5, α6, α7, and α8 are the higher-order coefficients of the even-order aspheric surface respectively.

[0071] The above parameters of the third lens 4 and the fourth lens 5 in this embodiment are shown in Table 2:

[0072] Table 2

[0073]

[0074] Here, E is the scientific notation symbol.

[0075] The prism group includes a first prism 6 and a second prism 7 arranged along the optical path. The first prism 6 and the second prism 7 are identical achromatic prisms. The calculation formula for the deviation angle δ2 of the optical axis of the outgoing light beam emitted from the prism group and the light source light beam emitted from the display unit 1 is:

[0076]

[0077] Wherein, θ1 is the deflection angle of the first prism 6 , θ2 is the deflection angle of the second prism 7 , n is the refractive index of the first prism 6 and the second prism 7 , and α is the vertex angle between the first prism 6 and the second prism 7 .

[0078] In this embodiment, the vertex angle α of the first prism 6 and the second prism 7 is 25°, the deflection angle θ1 of the first prism 6 is 14.91°, and the deflection angle θ2 of the second prism 7 is 14.91°. Figure 3 and Figure 4As shown, the magnification of this embodiment in the sagittal direction is 767.4, and the magnification in the meridional direction is 546.8. The emission angle of the outgoing light beam emitted from the projection assembly is 7° in the sagittal direction and 5° in the meridional direction. The compression ratio of the system is 1.4. The display unit 1 adopts a 32X32 pixel Micro-LED, so that the pixel resolutions in the meridional and sagittal directions are 0.21875° and 0.15625°, respectively.

[0079] like Figure 5 As shown, in this simulation, when the micro-LED portion of the display unit 1 is illuminated, the shape is 80, and the final output of the projection assembly is displayed as a compressed shape of 80. The pixel resolution angle of the projected image in the meridian direction is significantly improved. After adding the prism group, the original maximum illumination of the image plane is increased from 1141x to 1601x, and the image plane illumination is relatively increased by 1.4 times. The projection assembly of this embodiment is easy to operate. Simply by adjusting the rotation angle of the first prism 6 and the second prism 7 to change the deflection angle, the continuous change of the projected image compression ratio can be achieved. By controlling the rotation of the first prism 6 and the second prism 7, the projected image is completely compressed in the meridian direction within the effective viewing angle range, effectively utilizing the pixel size of the display unit 1, so that the energy of the display unit 1 is fully utilized, effectively improving the brightness and resolution of the projected image, and avoiding heat dissipation and heat resistance problems.

[0080] On the basis of the projection assembly mentioned in the above technical solution of the present invention, the present invention further provides a car light module, which includes the above-mentioned projection assembly of this application. The car light module has at least the advantages of the above-mentioned projection assembly, which will not be described one by one here.

[0081] On the basis of the projection assembly mentioned in the above technical solution of the present invention, the present invention further provides a vehicle, which includes the above-mentioned projection assembly or headlight module of this application. The vehicle has at least the advantages of the above-mentioned projection assembly, which will not be repeated here.

[0082] As can be seen from the above description, the advantages of the present invention are: first, the projection assembly of the present invention can realize a projection image with a continuously changing compression ratio; second, the projection assembly of the present invention can match the proportion of the projected image with the actual road lighting requirements by changing the compression ratio, thereby improving the brightness and resolution of the projected image and avoiding energy waste of the display unit; third, the projection assembly of the present invention is easy to operate; and fourth, the projection assembly of the present invention is relatively small in size.

[0083] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0085] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A projection assembly, characterized in that: It comprises a display module and a projection viewing angle compression ratio adjusting element, wherein the projection viewing angle compression ratio adjusting element is configured to be able to adjust the magnification of the projection image formed by the display module in the meridian direction and / or sagittal direction.

2. The projection assembly according to claim 1, wherein: The projection viewing angle compression ratio adjustment element is a prism group, which includes a plurality of prisms arranged along the light path, and each of the prisms is configured to be relatively rotatable. When adjusting the magnification in the meridian direction, at least part of the prism is controlled to rotate in the meridian plane, and when adjusting the magnification in the sagittal direction, at least part of the prism is controlled to rotate in the sagittal plane.

3. The projection assembly according to claim 2, wherein: The prism group comprises a first prism (6) and a second prism (7), and the first prism (6) and the second prism (7) are achromatic prisms.

4. The projection assembly according to claim 3, wherein: The first prism (6) and the second prism (7) are arranged so that the magnification of the prism group in the meridional direction is smaller than the magnification in the sagittal direction.

5. The projection assembly according to claim 3, wherein: The calculation formula for the deflection angle δ2 of the optical axis of the outgoing light beam emitted from the prism group and the light source light beam emitted from the display unit (1) is: Wherein, θ1 is the deflection angle of the first prism (6), θ2 is the deflection angle of the second prism (7), n1 is the refractive index of the first prism (6), n2 is the refractive index of the second prism (7), α1 is the vertex angle of the first prism (6), and α2 is the vertex angle of the second prism (7).

6. The projection assembly according to claim 5, characterized in that: The two achromatic prisms have the same refractive index and / or vertex angle.

7. The projection assembly according to claim 1, wherein: The display module comprises a display unit (1) and a magnifying imaging system, wherein the magnifying imaging system is arranged between the display unit (1) and the projection viewing angle compression ratio adjusting element, and the magnification of the magnifying imaging system in the meridian direction and the sagittal direction is set to a predetermined value.

8. The projection assembly according to claim 7, wherein: The magnifying imaging system comprises a first lens (2), a second lens (3), a third lens (4) and a fourth lens (5) which are arranged in sequence, wherein the first lens (2) is a plano-concave lens, the second lens (3) is a convex lens, the third lens (4) is a convex-concave lens, and the fourth lens (5) is a convex lens. The first lens light-emitting surface (202) of the first lens (2) and the second lens light-entering surface (301) of the second lens (3) have the same surface shape, the third lens light-emitting surface (401) of the third lens (4) and the fourth lens light-entering surface (501) of the fourth lens (5) have the same surface shape, the first lens (2) and the second lens (3) are spherical lenses, and the front and rear surfaces of the third lens (4) and the fourth lens (5) are both rotationally symmetric aspherical surfaces.

9. The projection assembly according to claim 8, wherein: The first lens (2) and the second lens (3) are glass lenses, and the third lens (4) and the fourth lens (5) are plastic lenses.

10. The projection assembly according to claim 8, wherein: The first lens (2) and the second lens (3) form a doublet lens.

11. The projection assembly according to claim 8, wherein: The third lens (4) includes a protruding third lens light entrance surface (401) and a recessed third lens light exit surface (402); the fourth lens (5) includes a protruding fourth lens light entrance surface (501) and a protruding fourth lens light exit surface (502); the third lens light entrance surface (401), the third lens light exit surface (402), the fourth lens light entrance surface (501) and the fourth lens light exit surface (502) are all even-order aspheric surfaces; the surface equations of the third lens light entrance surface (401), the third lens light exit surface (402), the fourth lens light entrance surface (501) and the fourth lens light exit surface (502) are: Among them, Z is the surface height, r is the radial radius coordinate of the surface, c is the curvature of the surface, k is the quadratic surface coefficient, α1, α2, α3, α4, α5, α6, α7, and α8 are the higher-order coefficients of the even-order aspheric surface respectively.

12. A vehicle light module, characterized in that: The projection assembly comprises the projection assembly according to any one of claims 1 to 11.

13. A vehicle, characterized in that: The invention comprises the projection assembly according to any one of claims 1 to 11 or the vehicle light module according to claim 12.

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