Optical system, projection system and head-up display

Abstract

The invention provides an optical system, a projection system and a head-up display, and relates to the technical field of optics. The optical system includes: a light source; the optical assembly is used for receiving the light beams generated by the light source and dodging the light beams; the optical assembly comprises at least one lens, and the lens comprises at least one micro-unit array. When the optical system is applied to projection, the lighting effect of a traditional compound eye dodging system structure can be improved, complex optical parts in the traditional compound eye dodging system are avoided, the equipment configuration cost is effectively reduced, the space occupied by the parts is reduced, and equipment miniaturization is facilitated.

Description

Technical Field

[0001] This application relates to the field of optical technology, and more particularly to an optical system, a projection system, and a head-up display. Background Technology

[0002] Projection technology has been widely used in the automotive industry. In projection lighting systems, compound eye uniform light systems ensure the uniformity of the projected light and improve light efficiency. Therefore, they are widely used in projectors and the image generation unit (PGU) that makes up the projection system.

[0003] Existing compound eye uniform light systems include multiple components such as compound eye lenses, compound eye apertures, and compound eye sheets, which occupy a lot of space, resulting in a large overall PGU size and making it difficult to miniaturize the projection system. Summary of the Invention

[0004] This application provides an optical system, a projection system, and a head-up display to solve the problem that existing compound eye light equalization systems include multiple components, occupy a large space, resulting in a large overall PGU size and making it difficult to miniaturize the projection system.

[0005] In a first aspect, this application provides an optical system, comprising:

[0006] Light source; and

[0007] An optical component for receiving and homogenizing a light beam generated by a light source; the optical component includes at least one lens, the lens including at least one micro-unit array.

[0008] The radii of curvature on both sides of the at least one lens satisfy the following formula:

[0009] 0 ≤ |R″ / R′| ≤ 0.8

[0010] In the formula, R′ is the radius of curvature of the side in contact with the micro-unit array; R″ is the radius of curvature of the side not in contact with the micro-unit array.

[0011] In one possible design, the lens includes a first lens located on the light-emitting side of the light source, the micro-unit array includes multiple micro-unit structures, and the multiple micro-unit structures are distributed at least on the first lens, the first lens being a corrective lens.

[0012] In one possible design, the lens further includes a second lens located on the light-emitting side of the first lens, with multiple micro-unit structures distributed on the light-emitting surface of the first lens and the light-incident surface of the second lens, and the second lens being a relay lens.

[0013] In one possible design, the micro-unit structures on the first and second lenses are arranged symmetrically.

[0014] In one possible design, the micro-unit structure on the first lens includes a first surface and a second surface along the optical axis, and the micro-unit structure on the second lens also includes a first surface and a second surface along the optical axis. The second surface of the micro-unit structure on the first lens is either convex or concave, and the first surface of the micro-unit structure on the second lens is convex. The second surface of the micro-unit structure on the first lens is the light-emitting surface of the first lens, and the first surface of the micro-unit structure on the second lens is the light-incident surface.

[0015] In one possible design, the radius of curvature of the second surface of the micro-unit structure distributed on the first lens and the radius of curvature of the first surface of the micro-unit structure distributed on the second lens satisfy the following formula:

[0016] 0.5≤|R² / R³|≤2

[0017] In the formula, R2 is the radius of curvature of the second surface of the micro-unit structure on the first lens; R3 is the radius of curvature of the first surface of the micro-unit structure on the second lens.

[0018] In one possible design, the number of micro-unit structures on the first lens and the number of micro-unit structures on the second lens are equal, and they satisfy the following formula:

[0019]

[0020] In the formula, N is the number of micro-unit structures; S1 is the total effective area of ​​the micro-unit structures in the first lens; S0 is the area of ​​a single micro-unit structure; 28mm 2 ≤S1≤6000mm 2 .

[0021] In one possible design, the at least one lens includes a first lens or a second lens.

[0022] In one possible design, the focal lengths of the first lens and the second lens satisfy the following formula:

[0023] 0.5≤F1 / F2≤10

[0024] or,

[0025] 1.2≤F1 / F2≤5

[0026] In the formula, F1 is the focal length of the first lens; F2 is the focal length of the second lens.

[0027] In one possible design, the median thickness of the first lens and the second lens satisfies the following formula:

[0028] 0.3≤T1 / T2≤3

[0029] or,

[0030] 0.5≤T1 / T2≤1.5

[0031] In the formula, T1 is the thickness of the first lens; T2 is the thickness of the second lens.

[0032] In one possible design, the thickness and radius of curvature of the micro-unit structure satisfy the following formula:

[0033]

[0034] or,

[0035]

[0036] In the formula, D is the thickness of the micro-unit structure; R is the radius of curvature of the micro-unit structure.

[0037] In one possible design, the micro-unit structure includes a first dimension a and a second dimension b, and satisfies the following formula:

[0038] 0.1mm≤a≤2.5mm; 0.1mm≤b≤2.5mm

[0039] Wherein, the first dimension a is the maximum transverse length of the micro-unit structure on the light-emitting surface of the corrective lens, and the second dimension b is the maximum longitudinal length of the micro-unit structure on the light-emitting surface of the corrective lens.

[0040] In one possible design, the micro-unit structure includes a lens, and the shape of the micro-unit structure includes at least one of rectangular, trapezoidal, elliptical, or circular shapes.

[0041] In one possible design, the projection system further includes a collimating device disposed between the light source and the first lens for collimating the light beam generated by the light source.

[0042] In one possible design, the light source includes at least a blue light source, a red light source, and a green light source.

[0043] In one possible design, the second lens includes a first sub-lens and a second sub-lens for converging the homogenized light beam. The second sub-lens is positioned after the first sub-lens at the light exit point. The focal length of the second sub-lens satisfies the following formula:

[0044] 0≤F4 / F3≤1

[0045] or,

[0046] 0.1 ≤ F4 / F3 ≤ 0.8

[0047] In the formula, F3 is the focal length of the first sub-lens; F4 is the focal length of the second sub-lens.

[0048] Thirdly, this application provides a projection system, including an optical system and imaging components as described above;

[0049] The imaging component is used to receive the homogenized light beam to form a projected image.

[0050] In one possible design, the focal length of the second lens and the distance between the second lens and the imaging assembly satisfy the following formula:

[0051] 0.5≤F2 / D′≤8

[0052] or,

[0053] 1≤F2 / D′≤5

[0054] In the formula, D′ is the distance between the second lens and the imaging component.

[0055] In one possible design, the first lens is a corrective lens, and the second lens is a relay lens.

[0056] In one possible design, the projection system further includes a filtering device disposed between the optical component and the imaging component for filtering the light beam.

[0057] In one possible design, the screening device is a prism or a polarizer.

[0058] In one possible design, the imaging component includes an imaging chip and a projection lens, wherein the imaging chip includes, but is not limited to, DMD, LCD, LCOS, and MEMS.

[0059] In one possible design, the divergence angle of the micro-unit structure satisfies the following formula:

[0060]

[0061] or,

[0062]

[0063] In the formula, S is the area of ​​the imaging chip, S1 is the total effective area of ​​the micro-unit structure in the first lens, and 12mm² ≤ S ≤ 310mm². 2 θ is the divergence angle of the micro-unit structure.

[0064] Thirdly, this application provides a head-up display, including a projection system.

[0065] Fourthly, this application provides a projection method using a projection system.

[0066] The optical system, projection system, and head-up display provided in this application, by setting the optical components in the projection system to include lenses and at least one micro-unit array for receiving and homogenizing the light beam generated by the light source, replace the traditional compound eye homogenizing system in terms of function and achieve 90% uniformity in performance. Compared with the traditional compound eye homogenizing system, the structure light efficiency is improved by about 2%. At the same time, it avoids the use of complex optical components in the traditional compound eye homogenizing system, effectively reducing the equipment configuration cost and the space occupied by components, which is conducive to the miniaturization of the equipment. Attached Figure Description

[0067] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 This is a schematic diagram illustrating an application scenario of the projection system provided in an embodiment of this application.

[0069] Figure 2 This is a schematic diagram of the optical system structure provided in an embodiment of this application;

[0070] Figure 3 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 1 ;

[0071] Figure 4 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 2 ;

[0072] Figure 5 The diagram below shows a rectangular micro-unit structure provided in an embodiment of this application, wherein (a) is a schematic diagram of the range of the first dimension a and the second dimension b, and (b) is a schematic diagram of the range of the divergence angle θ.

[0073] Figure 6 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 4 ;

[0074] Figure 7 Schematic diagram of the rectangular lens structure of the first micro-unit array and the second micro-unit array provided in the embodiments of this application. Figure 1 ;

[0075] Figure 8Image plane illumination distribution of the projection system provided in the embodiments of this application Figure 1 ;

[0076] Figure 9 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 5 ;

[0077] Figure 10 Schematic diagram of the rectangular lens structure of the first micro-unit array and the second micro-unit array provided in the embodiments of this application. Figure 2 ;

[0078] Figure 11 Image plane illumination distribution of the projection system provided in the embodiments of this application Figure 2 ;

[0079] Figure 12 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 6 ;

[0080] Figure 13 This is a schematic diagram illustrating the positional relationship between the first lens and the second lens and a portion of the micro-unit structure, as provided in an embodiment of this application.

[0081] Figure 14 The following are schematic diagrams of the structure of the first lens and the second lens with different surface shapes provided in the embodiments of this application, wherein (a) is a schematic diagram of the first lens being convex-flat, the first sub-lens in the second lens being plano-convex, and the second sub-lens being convex-convex (the second sub-lens may be deleted in some embodiments); (b) is a schematic diagram of the first lens being convex-convex, the first sub-lens in the second lens being convex-convex, and the second sub-lens being convex-convex (the second sub-lens may be deleted in some embodiments); and (c) is a schematic diagram of the first lens being convex-concave, the first sub-lens in the second lens being convex-convex, and the second sub-lens being convex-convex (the second sub-lens may be deleted in some embodiments).

[0082] Explanation of reference numerals in the attached figures:

[0083] 100. Head-up display; 101. Light source; 102. Optical component; 103. Imaging component; 202. Lens; 203. Micro-unit array; 302. First lens; 303. Second lens; 304. Collimating device; 305. Micro-unit array; 306. Imaging chip; 307. Projection lens; 601. RGB light source; 602. Collimating lens; 603. First reflector; 604. Correcting lens; 605. First micro-unit array; 606. Second micro-unit array; 607. First sub-lens; 608. Second reflector; 609. Second sub-lens; 610. Prism; 611. DMD chip; 910. Polarizer; 911. LCOS chip; 913. Relay lens. Detailed Implementation

[0084] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and systems consistent with some aspects of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0085] First, the relevant concepts or terms involved in this application will be explained:

[0086] Image Generation Unit (PGU): Composed of a light source and other optical components, it is used to generate the output image of the head-up display.

[0087] Head-up displays (HUDs) are widely used in the automotive industry. HUDs primarily generate projected images through a projection system, whose main image generation units consist of a light source, optical components, and imaging components. Among these, the optical components rely heavily on a compound-eye homogenization system to ensure the uniformity of light illuminating the image. Existing compound-eye homogenization systems mainly include multiple components such as compound-eye lenses, compound-eye apertures, and compound-eye sheets, occupying a large space and resulting in a large overall PGU size, making miniaturization difficult and increasing processing and manufacturing costs. Another type of compound-eye homogenization system uses a flat, double-sided coated microstructure compound eye approach. Different micro-units are prone to light crosstalk, generating a large amount of stray light and wasted light on the target surface. Furthermore, the numerous optical components in a compound-eye system cause light attenuation between different parts, resulting in low overall PGU luminous efficiency.

[0088] Based on the aforementioned technical problems, the inventive concept of this application is as follows: the light emitted by the light source is transformed into collimated light after passing through the collimating device and the correcting lens. Then, the micro-unit lens of the correcting lens focuses the collimated light onto the micro-unit structure of the relay lens, thereby splitting the light with uneven energy from the light source into several parts of uniform energy light. Then, the relay lens focuses these several parts of uniform energy light onto the imaging chip. After modulation and reflection by the imaging chip, the desired image is projected by the projection lens, aiming to solve the aforementioned technical problems of the prior art.

[0089] The specific application scenarios for this application are as follows:

[0090] Figure 1 This is a schematic diagram illustrating an application scenario of the projection system provided in an embodiment of this application. For example... Figure 1As shown, a user views a projected image on the windshield via a head-up display 100 installed in the vehicle. The head-up display 100 primarily relies on a projection system located inside the vehicle to generate the projected image, which is then reflected or refracted onto the windshield. The projection system includes a light source 101, an optical component 102, and an imaging component 103 arranged sequentially.

[0091] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0092] Figure 2 This is a schematic diagram of the optical system structure provided in an embodiment of this application. Figure 2 As shown, the optical system includes a light source 101 and optical components.

[0093] The optical component includes a lens 202 and at least one micro-unit array 203, wherein the micro-unit array includes a plurality of micro-unit structures arranged along the lens for receiving and homogenizing the light beam generated by the light source.

[0094] In the above method, by setting the micro-unit structure array on the lens, the compound eye function of the traditional compound eye lens system can be equivalently replaced. However, compared with the traditional compound eye lens system which requires supporting components such as compound eye lenses and compound eye diaphragms, the method of this application uses fewer components and is simpler, which is conducive to improving light transmittance and thus improving light efficiency.

[0095] The system provided in this embodiment uses multiple micro-unit structures arrayed on the lens to form a combined structure of micro-unit array and lens, thereby homogenizing the light beam emitted by the light source. Functionally, it replaces the traditional compound eye homogenization system, achieving 90% uniformity in performance. Compared with the traditional compound eye homogenization system, the structured light efficiency is improved by about 2%. At the same time, it avoids the use of complex optical components in the traditional compound eye homogenization system, effectively reducing equipment configuration costs and minimizing the space occupied by components, which is conducive to equipment miniaturization.

[0096] This application also provides a projection system, including an optical system and an imaging component.

[0097] An imaging component for receiving a homogenized light beam to form a projected image.

[0098] For example, the imaging component mainly includes an imaging chip and a projection lens.

[0099] The imaging chip can be selected from a variety of display chips, including but not limited to existing DMD, LCD, LCOS, and MEMS.

[0100] The projection lens can be configured in combination of one or more to meet different projection needs.

[0101] The projection system of this application will be described in detail below with reference to a specific embodiment.

[0102] Figure 3 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 1 .like Figure 3 As shown, the projection system includes a light source, optical components, and an imaging component.

[0103] Among them, the light source 101 includes at least a blue light source, a red light source, and a green light source.

[0104] The optical assembly includes a first lens 302, a second lens 303, a collimating device 304, a second sub-lens, a filtering device, and a micro-unit array 305 disposed on the first lens 302. The micro-unit array 305 includes a plurality of micro-unit structures disposed along the first lens 302 for receiving the light beam generated by the light source and homogenizing the light.

[0105] An imaging component includes an imaging chip 306 and at least one projection lens 307 for receiving a uniformly diffused light beam to form a projected image; wherein the imaging chip 306 may be a DMD chip, an LCOS chip, or an LCD chip, and the projection lens 307 may be configured as one or more combinations as needed.

[0106] For example, the first lens 302 can be a corrective lens, and the second lens 303 can be a relay lens. The first lens 302 and the second lens 303 are disposed between the light source and the imaging component, and the micro-unit array 305 is disposed on the side of the first lens 302 close to the second lens 303. By placing the micro-unit array 305 on the light-emitting surface of the first lens 302, this application not only ensures the corrective and converging light function of the first lens itself, but also promotes the uniform light effect of the first lens.

[0107] The collimating device 304 can be a collimating lens, disposed between the light source and the first lens 302, or disposed between the light source and the second lens 303, for collimating the light beam generated by the light source.

[0108] The radii of curvature on both sides of the first lens satisfy the following formula:

[0109] 0 ≤ |R″ / R′| ≤ 0.8

[0110] In the formula, R′ is the radius of curvature of the side in contact with the micro-unit structure; R″ is the radius of curvature of the side not in contact with the micro-unit structure.

[0111] The radius of curvature of the first lens surface on the side closer to the light source is set to be smaller than that on the side closer to the micro-unit structure. The greater curvature helps the light from the collimator to converge onto the surface of the micro-unit structure. At the same time, the larger radius of curvature on the side closer to the micro-unit structure helps the light to enter the micro-unit structure smoothly, thus improving uniformity.

[0112] The second sub-lens can be a relay lens, disposed between the first lens 302 and the imaging component, or disposed between the second lens 303 and the imaging component, for converging the homogenized light beam.

[0113] Optionally, the median thickness of the first lens and the second lens satisfies the following formula:

[0114] 0.3≤T1 / T2≤3

[0115] In the formula, T1 is the thickness of the first lens; T2 is the thickness of the second lens.

[0116] Setting the thickness values ​​of the two lenses to be close helps to keep the light smooth, thereby improving the illumination.

[0117] Preferably, the thickness of the first lens and the second lens satisfies the following formula:

[0118] 0.5≤T1 / T2≤1.5

[0119] In the formula, T1 is the thickness of the first lens; T2 is the thickness of the second lens. By further reducing the thickness ratio between the two lenses within the above range, the light can be made smoother, thereby increasing the illuminance.

[0120] The filtering device can be a prism or a polarizer, disposed between the optical component and the imaging component, for filtering the light beam.

[0121] The thickness and radius of curvature of the micro-unit structure satisfy the following formula:

[0122]

[0123] In the formula, D is the thickness of the micro-unit structure; R is the radius of curvature of the micro-unit structure.

[0124] Setting the thickness and radius of curvature of the micro-unit structure within the above range helps to reduce the beam height entering the micro-unit structure on the second lens 303, which can better converge the beam processed by the micro-unit structure on the first lens 302 into the micro-unit structure on the second lens 303 to enhance the uniform light effect. At the same time, it can also take into account the machinability of the optical structure lens, reducing the manufacturing difficulty and processing cost of the optical structure.

[0125] Preferably, the thickness and radius of curvature of the micro-unit structure satisfy the following formula:

[0126]

[0127] In the formula, D is the thickness of the micro-unit structure; R is the radius of curvature of the micro-unit structure. By limiting the above range, the height of the beam entering the micro-unit structure is further reduced, thereby further improving the light focusing effect and thus improving the light uniformity effect. Furthermore, by setting the proportional range, the processing difficulty is further reduced, thereby further reducing the manufacturing difficulty and processing cost of the optical structure.

[0128] Optionally, the divergence angle θ of the micro-unit structure satisfies the following formula:

[0129]

[0130] In the formula, S is the area of ​​the imaging chip, 12 mm². 2 ≤S≤310mm 2 S1 is the area of ​​the first lens; θ is the divergence angle of the micro-unit structure.

[0131] By setting the divergence angle within the above range, it can be ensured that the amount of light in the micro-unit structure is greater than the amount of light in the imaging component, thereby ensuring that the light can fill the entire imaging chip and preventing excessive light from the micro-unit structure from shining outside the imaging chip, which would lead to a decrease in light efficiency and improve the overall uniformity and light efficiency of the projection system.

[0132] Preferably, the divergence angle θ of the micro-unit structure satisfies the following formula:

[0133]

[0134] In the formula, S is the area of ​​the imaging chip, 12 mm². 2 ≤S≤310mm 2 S1 is the area of ​​the first lens; θ is the divergence angle of the micro-unit structure.

[0135] By setting the divergence angle within the above range, the amount of light in the micro-unit structure can be greater than the amount of light in the imaging component, further ensuring that the light can fill the entire imaging chip, thereby improving the overall uniformity and light efficiency of the projection system.

[0136] In some embodiments, the micro-unit structure can be a lens, and the shape of the micro-unit structure can be at least one of rectangle, trapezoid, ellipse or circle.

[0137] Optionally, the projection of the micro-unit structure onto a cross-section perpendicular to the optical axis includes a first dimension a and a second dimension b, wherein the first dimension a is the maximum lateral length on the corrective lens, and the second dimension b is the maximum longitudinal length on the corrective lens. The first dimension a and the second dimension b satisfy the following formula:

[0138] 0.1mm≤a≤2.5mm; 0.1mm≤b≤2.5mm.

[0139] Here, the first dimension a and the second dimension b correspond to the shape settings of the micro-unit structure.

[0140] For example, in a lens with a rectangular or circular micro-unit structure, the first and second dimensions are the maximum lateral and longitudinal lengths of the micro-unit on the light-emitting surface of the corrective lens. Limiting the size of the micro-unit structure to the above range helps improve the overall uniformity of the projection system and reduces the processing difficulty of the micro-unit structure and its array arrangement on the lens.

[0141] For example, it can avoid the situation where the light spot cannot completely fill the chip due to the small size of the micro-unit structure, thus affecting the overall uniformity of the image generation unit; and the processing difficulty of the micro-unit structure is also greater if the size is too small; it can also avoid the situation where the micro-unit structure cannot be arranged in a sufficient number in the limited lens arrangement space due to the large size. If the number is insufficient, there will not be enough light to play the role of homogenization, thus affecting the effect of the micro-unit structure on the beam uniformity.

[0142] As examples, trapezoidal and elliptical micro-unit structures are also applicable to this application.

[0143] The projection system provided in this embodiment, by arraying micro-unit structures on the corrective lens, eliminates the need for supporting components such as compound eye lenses and compound eye apertures compared to traditional solutions. This reduces the production cost and space occupied by the projection system, and decreases the number of optical elements the light beam passes through from the light source to the imaging component, thereby improving beam transmittance and ultimately enhancing luminous efficiency. Furthermore, by arraying micro-unit structures on the corrective lens, this embodiment maintains the corrective lens's ability to converge and collimate the illumination beam, ensuring its straight-line incidence, while also achieving a uniform light distribution effect across the entire system, resulting in a more uniform beam.

[0144] Figure 4 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 2 .like Figure 4 As shown, the projection system includes: a light source 101, an optical component, and an imaging component.

[0145] The light source can be at least a blue light source, a red light source, or a green light source.

[0146] The optical components may include a first lens 302, a second lens 303, a collimating device 304, a second sub-lens, a filtering device, and two micro-unit arrays 305 respectively disposed on the first and second lenses. Each micro-unit array 305 includes multiple micro-unit structures disposed along the first and second lenses 302 and 303, used to receive and homogenize the light beam generated by the light source. The imaging components include an imaging chip 306 and at least one projection lens 307, used to receive the homogenized light beam to form a projected image. The imaging chip 306 may be a DMD chip, an LCOS chip, or an LCD chip, and the projection lens 307 may be configured as one or more combinations as needed.

[0147] For example, the first lens 302 is a corrective lens, the second lens 303 is a relay lens, the first lens 302 and the second lens 303 are disposed between the light source and the imaging component, and the micro-unit array 305 is disposed between the first lens 302 and the second lens 303.

[0148] The collimating device 304 can be a collimating lens, which is disposed between the light source and the first lens 302 to collimate the light beam generated by the light source.

[0149] The second lens can be a first sub-lens and a second sub-lens, used to converge the homogenized light beam. The second sub-lens is disposed between the first sub-lens and the imaging component. The focal length of the second sub-lens satisfies the following formula:

[0150] 0≤F4 / F3≤1

[0151] In the formula, F3 is the focal length of the first sub-lens; F4 is the focal length of the second sub-lens. By setting the focal length of the second lens with the micro-unit array to be greater than that of the second sub-lens without the micro-unit array, it is beneficial for the light rays emerging from the micro-unit structure surface to transition smoothly. At the same time, the smaller focal length of the second sub-lens and its stronger converging effect are beneficial for the light rays to converge onto the imaging chip of the imaging component, thereby improving the system uniformity.

[0152] Preferably, the focal length of the second sub-lens satisfies the following formula:

[0153] 0.1 ≤ F4 / F3 ≤ 0.8

[0154] In the formula, F3 is the focal length of the first sub-lens; F4 is the focal length of the second sub-lens. By setting the above range, the stability of light can be further improved, ensuring that as much light as possible can be converged onto the imaging chip, thereby further improving the uniformity of the system.

[0155] The filtering device is a prism or polarizer, which is disposed between the optical component and the imaging component to filter the light beam.

[0156] The micro-unit structures distributed on the first lens 302 and the second lens 303 are symmetrically distributed. For example, symmetry refers to positional symmetry, that is, the micro-unit structures are arranged face to face. The second surface of the micro-unit structure on the first lens is convex or concave, which can be used to straighten the beam after the mirror curvature to achieve a homogenization effect. The first surface of the micro-unit structure on the second lens is convex, which can achieve a converging effect on the homogenized beam, thereby better transmitting the homogenized light to other optical systems or imaging chips. The combination of the two can ensure the improvement of the homogenization effect of the micro-unit structure and improve the uniformity of the overall projection beam of the projection system.

[0157] The radius of curvature of the second surface of the micro-unit structure distributed on the first lens and the radius of curvature of the first surface of the micro-unit structure distributed on the second lens satisfy the following formula:

[0158] 0.5≤|R² / R³|≤2

[0159] In the formula, R2 is the radius of curvature of the second surface of the micro-unit structure; R3 is the radius of curvature of the first surface of the micro-unit structure.

[0160] By symmetrically distributing the micro-unit structures on the two lenses and setting the difference in the radius of curvature on both sides to be small, crosstalk can be reduced, which is beneficial to improving the uniformity of the overall projection beam of the projection system.

[0161] Both excessively large and excessively small ranges can lead to severe light crosstalk, which is detrimental to the homogenization of light by the micro-unit structure and fails to achieve the homogenization effect. In some embodiments, the micro-unit structure can be at least one of a rectangular lens, a trapezoidal lens, an elliptical lens, or a circular lens.

[0162] Among them, the rectangular lens structure makes it easier to achieve symmetrical arrangement of the two lenses.

[0163] In this embodiment, by arraying micro-unit structures on the corrective lens and the relay lens, not only are the corrective lens able to converge and collimate the illumination beam so that it is collimated and incident on the rear system, and the second lens able to converge the front beam so that the beam enters the imaging chip at a specific size and angle, but the system is also able to achieve a uniform light effect, so that the whole system obtains a more uniform beam.

[0164] Figure 5 This is a schematic diagram of a rectangular micro-unit structure provided in an embodiment of this application, wherein (a) is a schematic diagram showing the range of the first dimension a and the second dimension b, and (b) is a schematic diagram showing the range of the divergence angle θ. Figure 5 As shown in (b), one side of it has a convex structure, and the convex surface includes a divergence angle θ, as shown in (b). Figure 5As shown in (a), the micro-unit structure includes a first dimension a and a second dimension b. The first dimension a is the maximum lateral length of the micro-unit structure on the light-emitting surface of the corrective lens, and the second dimension b is the maximum longitudinal length of the micro-unit structure on the light-emitting surface of the corrective lens. The micro-unit structure includes the first dimension a and the second dimension b, and satisfies the following formula:

[0165] 0.1mm≤a≤2.5mm; 0.1≤b≤2.5mm

[0166] Here, the first dimension a and the second dimension b correspond to the shape settings of the micro-unit structure.

[0167] For example, in a rectangular lens, the first dimension and the second dimension are the lengths of the long and short sides of the rectangle; in a trapezoidal lens, the first dimension and the second dimension are the lengths of the long side and the height of the trapezoid; in an elliptical lens, the first dimension and the second dimension are the lengths of the major and minor axes of the ellipse; and in a circular lens, the first dimension and the second dimension are the same, which is the diameter.

[0168] For example, the thickness and radius of curvature of the micro-unit structure satisfy the following formula:

[0169]

[0170] In the formula, D is the thickness of the micro-unit structure; R is the radius of curvature of the micro-unit structure.

[0171] Setting the thickness and radius of curvature of the micro-unit structure within the above range helps to reduce the beam height entering the micro-unit structure on the second lens 303, which can better converge the beam processed by the micro-unit structure on the first lens 302 into the micro-unit structure on the second lens 303 to enhance the uniform light effect. At the same time, it can also take into account the machinability of the optical structure lens, reducing the manufacturing difficulty and processing cost of the optical structure.

[0172] Preferably, the thickness and radius of curvature of the micro-unit structure satisfy the following formula:

[0173]

[0174] In the formula, D is the thickness of the micro-unit structure; R is the radius of curvature of the micro-unit structure. By setting the thickness and radius of curvature of the micro-unit structure within the above range, the light uniformity effect can be further improved. Due to the larger ratio range, the processing difficulty is further reduced, thereby further reducing the manufacturing difficulty and processing cost of the optical structure.

[0175] Optionally, the number of micro-unit structures on the first lens 302 and the number of micro-unit structures on the second lens 303 are equal, and satisfy the following formula:

[0176]

[0177] In the formula, N is the number of micro-unit structures; S1 is the total effective area of ​​the micro-unit structures in the first lens; S0 is the area of ​​a single micro-unit structure; 28mm 2 ≤S≤6000mm 2 .

[0178] By setting the number of micro-unit structures to the above range, the light beam can be divided into a sufficient number of sub-beams, thereby improving the uniformity of illumination and avoiding the effects of insufficient light homogenization effect and decreased light homogenization performance caused by setting the number of micro-unit structures too small.

[0179] For example, the number of micro-unit structures N is 2209; the area of ​​the first lens S1 is 453; and the area of ​​a single micro-unit structure S0 is 0.2.

[0180] For example, the radii of curvature on both sides of the first lens or the second lens satisfy the following formula:

[0181] 0 ≤ |R″ / R′| ≤ 0.8

[0182] In the formula, R′ is the radius of curvature of the side in contact with the micro-unit structure; R″ is the radius of curvature of the side not in contact with the micro-unit structure.

[0183] The radius of curvature of the first lens, located closer to the light source, is smaller than that of the lens closer to the micro-unit structure. This greater curvature facilitates the convergence of light from the collimator onto the micro-unit structure surface. Simultaneously, the larger radius of curvature closer to the micro-unit structure promotes smoother light entry and improves uniformity. The radius of curvature of the second lens, located on the side with the micro-unit array surface, is larger than that on the side without the array surface. This facilitates a smoother transition of light from the micro-unit structure. Furthermore, the smaller radius of curvature on the side closer to the imaging chip helps the light converge onto the imaging chip of the imaging component.

[0184] Under the premise of satisfying 0≤|R″ / R′|≤0.8 and simultaneously satisfying 0.5≤R2 / R3≤2, micro-unit structures can be designed on the corrective lens and / or relay lens. By strictly controlling the relative curvature radii of the corrective lens and the micro-unit and / or the relay lens and the micro-unit, this condition can ensure that the light collected by the corrective lens enters the micro-structure smoothly, thereby ensuring high light throughput while realizing the homogenization function of the micro-structure and / or the homogenized light smoothly enters the rear system.

[0185] In one possible implementation, the divergence angle θ of the micro-unit structure on the first lens 302 and the micro-unit structure on the second lens 303 satisfies the following formula:

[0186]

[0187] In the formula, S is the area of ​​the imaging chip, 12 mm². 2 ≤S≤310mm 2 S1 is the total effective area of ​​the micro-unit structure in the first lens; θ is the divergence angle of the micro-unit structure.

[0188] Preferably, the divergence angle θ of the micro-unit structure satisfies the following formula:

[0189]

[0190] In the formula, S is the area of ​​the imaging chip, 12 mm². 2 ≤S≤310mm 2 S1 is the total effective area of ​​the micro-unit structure in the first lens; θ is the divergence angle of the micro-unit structure.

[0191] By setting the divergence angle within the above range, the amount of light in the micro-unit structure can be greater than the amount of light in the imaging component, further ensuring that the light can fill the entire imaging chip, thereby improving the overall uniformity and light efficiency of the projection system.

[0192] By setting the divergence angle within the above range, it can be ensured that the amount of light in the micro-unit structure is greater than the amount of light in the imaging component, thereby ensuring that the light can fill the entire imaging chip and preventing excessive light from the micro-unit structure from shining outside the imaging chip, which would lead to a decrease in light efficiency and improve the overall uniformity and light efficiency of the projection system.

[0193] Optionally, the focal lengths of the first lens and the second lens satisfy the following formula:

[0194] 0.5≤F1 / F2≤10

[0195] In the formula, F1 is the focal length of the first lens; F2 is the focal length of the second lens.

[0196] The focal length of the first lens is set to be larger than that of a typical lens. A larger focal length for the first lens can smooth the light path, which is beneficial for the light entering the micro-unit structure to approach collimated light. By setting the focal lengths of the first and second lenses within the above range, the system uniformity can be improved while the system sensitivity can be reduced.

[0197] Preferably, the focal lengths of the first lens and the second lens satisfy the following formula:

[0198] 1.2≤F1 / F2≤5

[0199] In the formula, F1 is the focal length of the first lens; F2 is the focal length of the second lens.

[0200] By setting the focal lengths of the first and second lenses within the aforementioned range, and ensuring that the focal length of the first lens is greater than that of the second lens, the uniformity of light can be further improved and the sensitivity of the system reduced.

[0201] In some embodiments, the focal length of the second lens and the distance between the second lens and the imaging component satisfy the following formula:

[0202] 0.5≤F2 / D′≤8

[0203] In the formula, D′ is the distance between the second lens and the imaging component.

[0204] By utilizing the aforementioned relationship between the focal length of the second lens and the distance between the second lens and the imaging chip in the imaging assembly, the light homogenized by the micro-unit structure is fully received by the imaging chip, while also taking into account the PGU volume, which is beneficial for the overall miniaturization design of the projection system.

[0205] Preferably, the focal length of the second lens and the distance between the second lens and the imaging component satisfy the following formula:

[0206] 1≤F2 / D′≤5

[0207] In the formula, D′ is the distance between the second lens and the imaging component. By limiting the range described above, the distance relationship is further narrowed, thereby ensuring that the imaging chip receives all the light rays and further reducing the size of the PGU, which is beneficial for the overall miniaturization design of the projection system.

[0208] The projection system provided in this embodiment arranges micro-unit structures on the corrective lens and the first sub-lens in an array, and sets the micro-unit structures in an arrangement with equal number and radius of curvature. At the same time, the convex surfaces are arranged opposite each other. This achieves the goal of replacing the traditional compound eye system, while avoiding light crosstalk between different micro-unit structures, improving the uniform light effect, and reducing the generation of stray light and the waste of light efficiency.

[0209] The above-mentioned scheme of this application will be described in detail below through several specific examples of projection system structures.

[0210] Figure 6 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 4 .like Figure 6 As shown, the projection system includes, in sequence: an RGB light source 601, a collimating lens 602, a first reflecting mirror 603, a correcting lens 604, a first micro-unit array 605, a second micro-unit array 606, a first sub-lens 607, a second reflecting mirror 608, a second sub-lens 609, a prism 610, a DMD chip 611, and a projection lens 307.

[0211] The first micro-unit array 605 and the second micro-unit array 606 are respectively attached to the opposite surfaces of the corrective lens 604 and the first sub-lens 607.

[0212] The corrective lens has a plano-convex shape, R5 = 95mm, R6 = ∞, focal length F1 = 164mm, and thickness T1 = 3mm. The relay lens consists of two lenses: the first sub-lens has a plano-convex shape, R7 = ∞, R8 = 96.3mm, focal length F3 = 166mm, and thickness T2 = 3mm; the second sub-lens has a plano-convex shape, focal length F4 = 48.3mm, and the overall focal length of the relay lens is F2 = 51.2mm. The distance from the second sub-lens to the optical axis of the DMD chip is D4 = 15.36mm; the area of ​​the DMD chip 611 is S = 45.38mm². 2 .

[0213] The first micro-unit array 605 and the second micro-unit array 606 are symmetrically arranged rectangular lenses. The rectangular structure allows for better array arrangement on the lens surface, which is beneficial for symmetrical and equal arrangement of rectangular lenses on the two lenses.

[0214] The rectangular lens of the first micro-unit array 605 is plano-convex, and the rectangular lens of the second micro-unit array 606 is convex-planar. The plano-convex rectangular lens on the correction lens 604 makes it easier to achieve a homogenization effect on the collimated beam. The convex-planar rectangular lens on the first sub-lens 607 can better transmit the homogenized light to the second sub-lens 609. The two work together to make the uniformity of light processing of the overall projection system >90%.

[0215] The projection system structure in this embodiment can be defined as a compound eye-separated DLP-PGU structure.

[0216] Figure 7 Schematic diagram of the rectangular lens structure of the first micro-unit array and the second micro-unit array provided in the embodiments of this application. Figure 1 .like Figure 7 As shown, the thickness of the rectangular lens in the first micro-unit array is D1, the distance between the rectangular lenses in the first and second micro-unit arrays is D2, and the thickness of the rectangular lens in the second micro-unit array is D3. The radius of curvature of the first surface of the rectangular lens in the first micro-unit array is R1, the radius of curvature of the second surface of the rectangular lens in the first micro-unit array is R2, the radius of curvature of the first surface of the rectangular lens in the second micro-unit array is R3, and the radius of curvature of the second surface of the rectangular lens in the second micro-unit array is R4. The long side a of the rectangular lens is 0.92 mm, the short side b is 0.28 mm, and the divergence angle θ = 7°. Figure 6The corresponding micro-unit structural parameters in the structure shown are: R1=R4=∞, which is a planar structure; R2=1.3mm; R3=1.8mm; D1=D3=0.5mm; D2=2mm.

[0217] The image generation process of the compound eye-separated DLP-PGU structure includes:

[0218] The light emitted by the RGB light source first passes through a collimating lens and a correcting lens to become collimated light. Then, it is homogenized by the micro-unit structure on the correcting lens and the micro-unit structure of the first sub-lens. The homogenized light is then focused onto the DMD chip by the second sub-lens and the prism. After the DMD chip forms an image, it is reflected by the prism to the projection lens, so that the image can be projected onto the image plane through the projection lens.

[0219] Figure 8 Image plane illumination distribution of the projection system provided in the embodiments of this application Figure 1 .like Figure 8 As shown, the uniformity of the image plane illumination distribution system of this compound eye-separated DLP-PGU structure is over 90%.

[0220] Figure 9 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 5 .like Figure 9 As shown, the projection system includes:

[0221] The following components are arranged sequentially: RGB light source 601, collimating lens 602, first reflector 603, correcting lens 604, first micro-unit array 605, second micro-unit array 606, first sub-lens 607, second reflector 608, second sub-lens 609, polarizer 910, LCOS chip 911, and projection lens 307.

[0222] The first micro-unit array 605 and the second micro-unit array 606 are respectively attached to the opposite surfaces of the corrective lens 604 and the first sub-lens 607.

[0223] The corrective lens has a convex-convex shape, with R5 = 95mm, R6 = 200mm, focal length F1 = 111.49mm, and thickness T1 = 5mm. The relay lens consists of two lenses: the first sub-lens has a convex-convex shape, with R7 = 200mm, R8 = 96.3mm, focal length F3 = 112.56mm, and thickness T2 = 6mm; the second sub-lens has a convex flat shape, with a focal length F4 = 48.3mm. The overall focal length of the relay lens is F2 = 52.98mm. The distance from the second sub-lens to the LCOS chip is D4 = 30.26mm. The area of ​​the DMD chip 611 is S = 45.38mm². 2 .

[0224] The first micro-unit array 605 and the second micro-unit array 606 are symmetrically arranged rectangular lenses. The rectangular structure allows for better array arrangement on the lens surface, which is beneficial for symmetrical and equal arrangement of rectangular lenses on the two lenses.

[0225] The rectangular lens of the first micro-unit array 605 is concave-convex, and the rectangular lens of the second micro-unit array 606 is convex-concave. The concave-convex rectangular lens on the correction lens 604 makes it easier to achieve a homogenization effect on the collimated beam. The convex-concave rectangular lens on the first sub-lens 607 can better transmit the homogenized light to the second sub-lens 609. The two work together to make the uniformity of light processing of the overall projection system >90%.

[0226] The projection system structure in this embodiment can be defined as a compound eye-separated LCOS-PGU structure.

[0227] Figure 10 Schematic diagram of the rectangular lens structure of the first micro-unit array and the second micro-unit array provided in the embodiments of this application. Figure 2 The micro-unit structure is a rectangular lens, which fills the entire second surface of the first lens and the first surface of the second lens. The long side a of the rectangular lens is 0.92 mm, the short side b is 0.28 mm, and the divergence angle θ = 7°.

[0228] like Figure 10 As shown, the thickness of the rectangular lens of the first micro-unit array is D1, the distance between the rectangular lenses of the first micro-unit array and the rectangular lenses of the second micro-unit array is D2, and the thickness of the rectangular lens of the second micro-unit array is D3.

[0229] The micro-unit structure has concave-convex and convex-concave surface types. The first surface of the rectangular lens of the first micro-unit array has a radius of curvature of R5, the second surface of the rectangular lens of the first micro-unit array has a radius of curvature of R6, the first surface of the rectangular lens of the second micro-unit array has a radius of curvature of R7, and the second surface of the rectangular lens of the second micro-unit array has a radius of curvature of R8.

[0230] The above Figure 9 The corresponding micro-unit structural parameters in the structure shown are: R1 = R4 = 200 mm; R2 = 1.8 mm; R3 = 1.3 mm; D1 = D3 = 0.5 mm; D2 = 2 mm.

[0231] The image generation process for the compound eye-separated LCOS-PGU structure includes:

[0232] The light emitted by the RGB light source first passes through a collimating lens and a correcting lens to become collimated light. Then, it is homogenized by the micro-unit structure on the correcting lens and the micro-unit structure of the first sub-lens. The homogenized light is then focused onto a polarizer by the second sub-lens and a prism. The polarizer selectively transmits P-light, which is then reflected by the LCOS chip to form S-light for imaging. Finally, the image is projected onto the image plane by the projection lens.

[0233] Figure 11 Image plane illumination distribution of the projection system provided in the embodiments of this application Figure 2 .like Figure 11 As shown, the uniformity of the image plane illumination distribution system of this compound eye-separated LCOS-PGU structure is over 90%.

[0234] Figure 12 Schematic diagram of the projection system structure provided in the embodiments of this application Figure 6 .like Figure 12 As shown, the projection system includes:

[0235] The following components are arranged sequentially: RGB light source 601, collimating lens 602, first reflector 603, correcting lens 604, first micro-unit array 605, second micro-unit array 606, relay lens 913, second reflector 608, polarizer 910, LCOS chip 911, and projection lens 307.

[0236] The first micro-unit array 605 and the second micro-unit array 606 are respectively attached to the opposite surfaces of the corrective lens 604 and the relay lens 913.

[0237] refer to Figure 9 and Figure 12 As can be seen, the difference between this embodiment and the compound eye-separated LCOS-PGU structure in the previous embodiment is that the compound eye-separated LCOS-PGU structure is omitted. Figure 9 The second sub-lens 609 in the projection system can achieve the same effect of uniformity of light processing of >90% for the entire projection system.

[0238] For ease of comparison, this application also provides a comparison table of projection system parameters in the above embodiments, as shown in Table 1 below.

[0239] Table 1

[0240]

[0241] In the above embodiments, there are various possible combinations of lenses and micro-unit structures, for example, Figure 13 This is a schematic diagram illustrating the positional relationship between the first lens and the second lens and a micro-unit structure, respectively, provided in an embodiment of this application. Figure 14 Schematic diagrams of the structure of a first lens and a second lens with different surface shapes provided in embodiments of this application. (Reference) Figure 13 , 14 As shown, Figure 13 The diagram shows the distance relationships. Figure 14 In the middle (a), there is a possible combination of the structure of the first lens being convex-planar, the first sub-lens in the second lens being plano-convex, and the second sub-lens being convex-convex (the second sub-lens may be deleted in some embodiments); Figure 14 In (b), there is a possible combination of a first convex-convex first lens, a second convex-convex first sub-lens in the second lens, and a second convex-convex second sub-lens (the second sub-lens may be deleted in some embodiments); Figure 14 In the middle (c), there is a possible combination of the structure of the first lens being convex and concave, the first sub-lens of the second lens being convex and convex, and the second sub-lens being convex and convex (the second sub-lens may be deleted in some embodiments).

[0242] This application also provides a head-up display, including a projection system.

[0243] The head-up display provided in this embodiment adopts the projection system of the above embodiment, and its implementation principle and technical effect are similar, so it will not be described again here.

[0244] This application also provides a projection method, which uses a projection system to generate a projected image.

[0245] The projection method provided in this embodiment uses the projection system of the above embodiment, and its implementation principle and technical effect are similar, so it will not be described again here.

[0246] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0247] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0248] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0249] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0250] It will be understood by those skilled in the art that, in the description of the embodiments of this application, the term "and / or" merely indicates a relationship describing the associated objects, meaning that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, the term "at least one" indicates any combination of at least two of a plurality of options, for example, including at least one of A, B, and C, which can represent any one or more elements selected from a set including communication between A, B, and C. Moreover, the term "multiple" means two or more, unless otherwise precisely specified.

[0251] In the description of the embodiments of this application, the terms "first," "second," "third," "fourth," etc. (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0252] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical system, characterized in that, include: light source; as well as An optical component for receiving and homogenizing a light beam generated by a light source; the optical component includes at least one lens, the lens including at least one micro-unit array; The radii of curvature on both sides of the at least one lens satisfy the following formula: 0≤|R″ / R ′ |≤0.8 In the formula, R ′ R' is the radius of curvature of the side that contacts the microarray; R'' is the radius of curvature of the side that does not contact the microarray.

2. The optical system according to claim 1, characterized in that, The lens includes a first lens located on the light-emitting side of the light source. The micro-unit array includes multiple micro-unit structures, which are distributed at least on the first lens. The first lens is a corrective lens.

3. The optical system according to claim 2, characterized in that, The lens also includes a second lens, which is located on the light-emitting side of the first lens. Multiple micro-unit structures are respectively distributed on the light-emitting surface of the first lens and the light-incident surface of the second lens. The second lens is a relay lens.

4. The optical system according to claim 3, characterized in that, The micro-unit structures on the first lens and the second lens are arranged symmetrically.

5. The optical system according to claim 3, characterized in that, The micro-unit structure on the first lens includes a first surface and a second surface along the optical axis, and the micro-unit structure on the second lens includes a first surface and a second surface along the optical axis. The second surface of the micro-unit structure of the first lens is the light-exiting surface of the first lens, and the first surface of the micro-unit structure of the second lens is the light-incident surface. The second surface of the micro-unit structure on the first lens is either convex or concave, and the first surface of the micro-unit structure on the second lens is convex.

6. The optical system according to any one of claims 3-5, characterized in that, The micro-unit structure on the first lens includes a first surface and a second surface along the optical axis, and the micro-unit structure on the second lens also includes a first surface and a second surface along the optical axis. The radius of curvature of the second surface of the micro-unit structure distributed on the first lens and the radius of curvature of the first surface of the micro-unit structure distributed on the second lens satisfy the following formula: 0.5≤|R² / R³|≤2 In the formula, R2 is the radius of curvature of the second surface of the micro-unit structure on the first lens; R3 is the radius of curvature of the first surface of the micro-unit structure on the second lens.

7. The optical system according to claim 6, characterized in that, The number of micro-unit structures on the first lens and the number of micro-unit structures on the second lens are equal, and they satisfy the following formula: In the formula, N is the number of micro-unit structures; S1 is the total effective area of ​​the micro-unit structures in the first lens; 28mm 2 ≤S1≤6000mm 2 S0 represents the area of ​​a single micro-unit structure.

8. The optical system according to any one of claims 3-5, characterized in that, The focal lengths of the first lens and the second lens satisfy the following formula: 0.5≤F1 / F2≤10 In the formula, F1 is the focal length of the first lens; F2 is the focal length of the second lens.

9. A projection system, characterized in that, Including optical systems and imaging components; The optical system is the optical system described in any one of claims 1-8; The imaging component is used to receive the homogenized light beam to form a projected image.

10. A heads-up display, characterized in that, Including the projection system as described in claim 9.

Images