Projection device, optical device and vehicle

Abstract

The application relates to a projection device, an optical device and a vehicle. The projection device comprises a color wheel unit and a galvanometer unit; the galvanometer unit comprises a first galvanometer configured to be arranged on a transmission path of a light beam; the color wheel unit is arranged on one side of the galvanometer unit and is configured to receive the light beam and convert the light beam into incoherent light; wherein the first galvanometer is used for adjusting the transmission direction of the light beam so that the light beam can be incident on the color wheel unit. The application aims to solve the technical problem of laser speckle in the projection technology in the related art.

Description

Technical Field

[0001] This application relates to the field of optical technology, and more particularly to a projection device, an optical device, and a vehicle. Background Technology

[0002] With the popularization of new energy vehicles, intelligent driving and intelligent interaction have gradually become the main selling points of mid-to-high-end new energy vehicles. Among the many intelligent experiences, projection technology can project the viewpoint directly in front of the driver's horizontal field of vision, effectively reducing the frequency of drivers looking down at the instrument panel and improving driving safety. After years of development, head-up displays have gradually matured in terms of technology, and augmented reality head-up displays (AR-HUD) have already become widespread in mid-to-high-end new energy vehicles. As costs further decrease, they are expected to be adopted across the entire automotive market. Among related technologies, the main projection method applied to AR-HUD is laser scanning projection technology (LBS), but laser scanning projection technology suffers from the technical problem of laser speckle. Utility Model Content

[0003] This application provides a projection device, an optical device, and a vehicle, aiming to solve the technical problem of laser speckle in projection technology in related technologies.

[0004] To achieve the above objectives, according to a first aspect of this application, a projection device is provided, comprising:

[0005] A galvanometer unit includes a first galvanometer configured to be positioned on the propagation path of the light beam; and...

[0006] A color wheel unit is disposed on one side of the galvanometer unit and is configured to receive the light beam and convert the light beam into incoherent light;

[0007] The first galvanometer is used to adjust the transmission direction of the light beam so that the light beam can enter the color disk unit.

[0008] In some embodiments, the projection device further includes a laser unit disposed on the side of the first galvanometer away from the color wheel unit, the laser unit being capable of emitting laser light, and the laser light being capable of emitting the beam.

[0009] In some embodiments, the laser unit includes a blue laser emitter capable of emitting blue laser light.

[0010] In some embodiments, the blue laser includes a single-mode blue laser or a multi-mode blue laser.

[0011] In some embodiments, the blue laser is the single-mode blue laser, the collimated spot size of the single-mode blue laser is L1, 50μm≤L1≤120μm, and the imaging distance of the collimated spot is 150mm-300mm.

[0012] In some embodiments, the blue laser is a single-mode blue laser, and the power of the single-mode blue laser is P1, where 40mW≤P1≤1W.

[0013] In some embodiments, the blue laser is the multimode blue laser, the collimated spot size of the multimode blue laser is L2, 200μm≤L2≤300μm, and the imaging distance of the collimated spot is 150mm-300mm.

[0014] In some embodiments, the blue laser is the multimode blue laser, and the power of the multimode blue laser is P2, where 1W≤P2≤20W.

[0015] In some embodiments, the first galvanometer includes either a projection galvanometer or a reflection galvanometer.

[0016] In some embodiments, the projection device further includes a laser unit;

[0017] The first galvanometer is the transmission galvanometer, and the laser unit, the first galvanometer, and the color disk unit are spaced apart in the direction of the beam transmission path.

[0018] In some embodiments, the projection device further includes a laser unit;

[0019] The first galvanometer is the reflecting lens, the laser unit and the first galvanometer are spaced apart along a first direction, and the first galvanometer and the color disk unit are spaced apart along a second direction;

[0020] Wherein, the first direction is the transmission direction of the light beam, and the second direction intersects with the first direction.

[0021] In some embodiments, the projection device further includes a first collimation unit disposed between the laser unit and the galvanometer unit, the first collimation unit being used to adjust the parallelism of the laser.

[0022] In some embodiments, the incoherent light includes at least one of fluorescence or phosphorescence.

[0023] In some embodiments, the color wheel unit includes a plurality of color wheel sections, each with a different color, and the plurality of color wheel sections are used to convert the laser into incoherent light of different colors.

[0024] In some embodiments, the plurality of color wheel portions include at least one of a blue light portion, a red light portion, a green light portion, a yellow light portion, and a white light portion.

[0025] In some embodiments, each of the color wheel portions is provided with a light-emitting material portion, which is used to convert the light beam into the incoherent light.

[0026] In some embodiments, the luminescent material portion includes at least one of a phosphorescent material portion, a fluorescent material portion, a nanomaterial portion, a rare earth doped portion, or a fluorescent material portion.

[0027] In some embodiments, the color wheel unit includes an incident surface and an exit surface, the incident surface being close to the laser unit;

[0028] The projection device further includes at least one diffractive optical microstructure, wherein the at least one diffractive optical microstructure is disposed on the incident surface and / or the exit surface.

[0029] In some embodiments, the diffractive optical microstructure is disposed on the incident surface, and the diffractive optical microstructure is used to shape the laser; and / or,

[0030] The diffractive optical microstructure is disposed on the exit surface, and the diffractive optical microstructure is used to homogenize the laser light passing through the color disk unit.

[0031] In some embodiments, the projection device further includes an imaging unit disposed on the side of the color wheel unit opposite to the first galvanometer, the imaging unit being used to receive the incoherent light and form an image.

[0032] In some embodiments, the imaging unit includes a projection screen or a digital micromirror device.

[0033] In some embodiments, the galvanometer unit further includes a second galvanometer disposed between the imaging unit and the color wheel unit. The second galvanometer is used to adjust the transmission direction of the incoherent light so that the incoherent light can be projected onto the imaging unit.

[0034] In some embodiments, the second galvanometer includes a silicon-based galvanometer or a silicon carbide-based galvanometer.

[0035] In some embodiments, the projection device further includes a second collimation unit disposed on the side of the color wheel unit away from the first galvanometer, and the second collimation unit is used to adjust the parallelism of the incoherent light.

[0036] In some embodiments, the second collimation unit includes a microlens or an aperture.

[0037] In some embodiments, the galvanometer unit further includes a third galvanometer, which is disposed on the side of the second collimating unit away from the color wheel unit, and is used to combine the incoherent light.

[0038] In some embodiments, the third galvanometer includes a dichroic mirror or a grating.

[0039] In some embodiments, the first galvanometer includes a silicon-based galvanometer or a silicon carbide-based galvanometer.

[0040] In some embodiments, the spectral band range of the color wheel unit covers 430 nm to 760 nm.

[0041] According to a second aspect of this application, an optical device is provided, including the projection device as described above.

[0042] According to a third aspect of this application, a vehicle is also provided, including the projection device or optical device as described above.

[0043] Beneficial effects:

[0044] In the technical solution of this application, the first galvanometer is disposed on the transmission path of the light beam and located on one side of the color disk unit. The first galvanometer is used to adjust the transmission direction of the light beam so that the light beam can be incident on the color disk unit. The color disk unit is configured to receive the light beam and convert the light beam into incoherent light. By cooperating with the color disk unit, the light beam is converted into incoherent light, avoiding the coherence between the light beams, thereby solving the technical problem of laser speckle in projection technology in related technologies.

[0045] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0048] Figure 1 These are simplified structural diagrams of some embodiments of the projection device provided in this application;

[0049] Figure 2 These are simplified structural diagrams of some other embodiments of the projection device provided in this application;

[0050] Figure 3 These are simplified structural diagrams of some other embodiments of the projection device provided in this application;

[0051] Figure 4 These are simplified structural diagrams of some further embodiments of the projection device provided in this application;

[0052] Figure 5 yes Figure 1 Front view of the middle color wheel unit;

[0053] Figure 6 yes Figure 1 Side view of the middle color wheel unit;

[0054] Figure 7 yes Figure 1 Top view of the middle color wheel unit;

[0055] Figure 8 This is an image of the speckle effect of an LBS projection system provided in related technologies;

[0056] Figure 9 This is an image showing the speckle effect of an embodiment of the projection device provided in this application;

[0057] Figure 10 This is an image showing the speckle effect in another embodiment of the projection device provided in this application.

[0058] Explanation of reference numerals in the attached figures:

[0059] 100. Projection device; 10. Laser unit; 11. Laser; 20. Color disk unit; 21. Incoherent light; 211. Blue fluorescence; 212. Green fluorescence; 213. Red fluorescence; 22. Incident surface; 23. Exit surface; 24. Color disk section; 25. Diffractive optical microstructure; 30. Galvanometer unit; 31. First galvanometer; 32. Second galvanometer; 33. Third galvanometer; 331. Grating; 332. Dichroic mirror; 40. Imaging unit; 50. First collimation unit; 60. Second collimation unit. Detailed Implementation

[0060] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0061] With the popularization of new energy vehicles, intelligent driving and intelligent interaction have gradually become the main selling points of mid-to-high-end new energy vehicles. Among the many intelligent experiences, head-up displays (HUDs) can project the viewpoint directly in front of the driver's horizontal field of vision, effectively reducing the frequency of drivers looking down at the instrument panel and improving driving safety. After years of development, head-up displays have gradually matured in terms of technology, and augmented reality head-up displays (AR-HUDs) have already become widespread in mid-to-high-end new energy vehicles. As costs further decrease, they are expected to be adopted across the entire automotive market.

[0062] Currently, the main projection methods used in AR-HUDs are Thin Film Transistor (TFT), Digital Light Processing (DLP), Liquid Crystal On Silicon (LCOS), and Laser Beam Scanning (LBS). TFT is currently the mainstream technology, boasting advantages such as mature technology and low cost. However, it also suffers from challenges in thermal management, limited brightness contrast, and limited clarity. DLP offers better display quality compared to TFT and effectively solves the problem of sunlight backflow; however, DLP is a patented technology of Texas Instruments (TI), making cost control difficult. LCOS has also achieved breakthroughs in automotive-grade applications, but LCOS chips have high requirements for packaging and testing technology, suffer from a single imaging focal length, and face challenges in thermal management. LBS offers low cost and good performance, but its maturity is relatively low, and many issues still need to be addressed, such as laser speckle.

[0063] In view of this, this application proposes a projection device 100. Figures 1 to 7 This is a schematic diagram of an embodiment of the projection device 100 provided in this application. The projection device 100 provided in this application can reduce the coherence between lasers 11 and can effectively reduce speckle contrast. The projection device 100 will be described in detail below with reference to the main drawings.

[0064] Please see Figure 1 and Figure 2 This application provides a projection device 100, which includes a color disk unit 20 and a galvanometer unit 30. The color disk unit 20 is configured to receive a light beam and convert the light beam into incoherent light 21. The galvanometer unit 30 includes a first galvanometer 31, which is disposed on the transmission path of the light beam and located on one side of the color disk unit 20. The first galvanometer 31 is used to adjust the transmission direction of the light beam so that the light beam can enter the color disk unit 20.

[0065] In the technical solution of this application, the first galvanometer 31 is disposed on the transmission path of the light beam and located on one side of the color disk unit 20. The first galvanometer 31 is used to adjust the transmission direction of the light beam so that the light beam can be incident on the color disk unit 20. The color disk unit 20 is configured to receive the light beam and convert the light beam into incoherent light. By cooperating with the color disk unit 20, the first galvanometer 31 converts the light beam into incoherent light 21, avoiding the coherence between the light beams, thereby solving the technical problem of laser speckle in projection technology in related technologies.

[0066] In traditional Laser Beam Scanning Head-Up Display (LBSHUD) solutions, three-color lasers are typically used. After collimation and beam combining, the light is projected onto a screen through a MEMS galvanometer. Due to the coherence of the laser beam 11, speckle effects are unavoidable during projection. Only when the speckle contrast is below 4% will the human eye not perceive the speckle phenomenon, thus meeting automotive-grade requirements. Traditional Laser Beam Scanning (LBS) solutions struggle to effectively reduce speckle contrast. Some suppliers have proposed using a phosphor wheel, where the laser 11 illuminates a rotating phosphor wheel, converting the coherent laser 11 into incoherent light 21, thereby reducing speckle contrast. However, this rotating phosphor wheel has low stability, making it difficult to meet automotive-grade requirements and limiting its application in vehicles.

[0067] In some embodiments, the incoherent light can be either fluorescence or phosphorescence, and the appropriate method can be chosen based on the specific circumstances.

[0068] In some embodiments, the projection device 100 further includes a laser unit 10, which is disposed on the side of the first galvanometer 31 opposite to the color disk unit 20. The laser unit 10 is capable of emitting a laser 11, and the laser 11 is capable of emitting the light beam. In the technical solution of this application, the laser unit 10 is capable of emitting a laser 11, and the first galvanometer 31 is disposed between the color disk unit 20 and the laser unit 10 to adjust the transmission direction of the laser 11 so that the laser 11 can pass through the color disk unit 20. The color disk unit 20 corresponds to the laser unit 10, allowing the laser 11 to pass through, thereby converting the laser 11 into incoherent light 21. By cooperating with the color disk unit 20, the first galvanometer 31 converts the laser 11 into incoherent light 21, avoiding the coherence between lasers 11, thereby solving the technical problem of laser 11 speckle in projection technology in related technologies.

[0069] Please see Figure 1 ,by Figure 1Taking the first direction as an example, the first direction intersects with the second direction. The angle between the first direction and the second direction is not limited and can be 80°, 85°, 90°, 95°, or 100°. In the following embodiments, the angle between the first direction and the second direction is 90°. It should also be emphasized that the angle between the first direction and the second direction being 90° does not constitute a limitation on the following embodiments of this application.

[0070] It should be noted that in this embodiment, the first galvanometer 31 is used to change the transmission direction of the laser 11 so that the laser 11 can be incident on the color disk unit 20, thereby causing the color disk unit 20 to convert the laser 11 into incoherent light 21.

[0071] It should be noted that the specific type of the first galvanometer 31 is not limited; it can be selected according to the actual situation.

[0072] Please see Figure 1 In some embodiments, when the first galvanometer 31 is a reflecting galvanometer, the first galvanometer 31 is a one-dimensional MEMS galvanometer, which can reflect the laser 11. Specifically, the laser unit 10 and the first galvanometer 31 are spaced apart along a first direction, and the first galvanometer 31 and the color disk unit 20 are spaced apart along a second direction. The laser 11 emitted by the laser unit 10 extends along the first direction. When the laser 11 is incident on the one-dimensional MEMS galvanometer, the emission direction of the laser 11 is changed by the reflection effect of the one-dimensional MEMS galvanometer, so that the laser 11 is emitted along the second direction, thereby enabling the laser 11 to be incident on the color disk unit 20.

[0073] Please see Figure 2 In other embodiments, when the first galvanometer 31 is a transmission galvanometer, the first galvanometer 31 is a one-dimensional transmission MEMS galvanometer, which allows the laser 11 to pass through. Specifically, the laser unit 10, the first galvanometer 31, and the color disk unit 20 are spaced apart along a first direction. The laser 11 emitted by the laser unit 10 extends along the first direction. When the laser 11 enters the one-dimensional transmission MEMS galvanometer, it passes through the one-dimensional MEMS galvanometer, allowing the laser 11 to continue to be emitted along the first direction, thereby enabling the laser 11 to enter the color disk unit 20.

[0074] It should be noted that the specific type of laser unit 10 is not limited and can be selected according to the actual situation. For example, in some embodiments, laser unit 10 is a blue laser emitter, which can emit blue laser light. The blue laser can emit high-energy blue light, which can be converted into incoherent light 21 on the color disk unit 20. In some instances, the blue laser can also be replaced with lasers of other colors, depending on the application scenario. For example, it can be blue and yellow to form white light. Alternatively, the blue laser can excite red, green, and blue fluorescent materials to form red, green, and blue light, which can be mixed to form white light.

[0075] Specifically, in this application, the color wheel unit 20 includes a fluorescent color wheel. Blue laser light is irradiated onto the fluorescent color wheel to achieve rapid conversion between RGB colors. The RGB colors are then combined through an optical path to form white light. The switching of the RGB colors can be controlled by controlling the signal output of the blue laser emitter, thereby achieving color controllability. The switching frequency of RGB colors is higher than the frequency of human eye perception, thus allowing the human eye to perceive a multi-color display effect. Unlike existing technologies, the fluorescent color wheel in this application is a fixed module and does not require rotation. All components or modules used in the entire system meet automotive-grade requirements.

[0076] It should be noted that the specific type of blue laser is not limited; for example, it can be a single-mode blue laser or a multi-mode blue laser.

[0077] In some embodiments, the spot size typically increases with the distance of laser imaging. When the blue laser is a single-mode blue laser, the spot size of the collimated single-mode blue laser is L1, 50μm≤L1≤120μm, and the imaging distance is 150mm-300mm; for example, L1 can be 50μm, 51μm, 52μm, 55μm, 58μm, 60μm, 65μm, 70μm, 72μm, 78μm, 80μm, 85μm, 90μm, 94μm, 100μm, 110μm, 114μm, 115μm, 116μm, 118μm, 120μm, or other unlisted data.

[0078] In some embodiments, when the blue laser is a single-mode blue laser, the power of the single-mode blue laser is P1, 40mW≤P1≤1W.

[0079] In some embodiments, when the blue laser is a multimode blue laser, the collimated multimode blue laser spot size is L2, 200μm≤L2≤300μm, and the imaging distance of the collimated spot is 150mm-300mm; for example, L2 can be 200μm, 210μm, 215μm, 220μm, 228μm, 230μm, 231μm, 238μm, 240μm, 242μm, 249μm, 250μm, 260μm, 270μm, 281μm, 285μm, 290μm, 295μm, 300μm or other unlisted data.

[0080] In some embodiments, when the blue laser is a multimode blue laser, the power of the multimode blue laser is P2, where 1W≤P2≤20W.

[0081] In some embodiments, please refer to Figure 3 The projection device 100 also includes a first collimation unit 50, which is located between the laser unit 10 and the galvanometer unit 30. The first collimation unit 50 is used to adjust the parallelism of the laser 11. Although the directionality of the laser 11 is much better than that of ordinary light sources, it still has a certain degree of divergence angle (ranging from a few degrees to more than ten degrees). This means that the light from the laser 11 will gradually spread out after it comes out of the light source. The first collimation unit 50 recalibrates the originally divergent conical laser 11 into a nearly parallel laser 11 through optical refraction or reflection, thereby providing energy to the laser 11.

[0082] Furthermore, in some embodiments, the first collimation unit 50 includes a fast-axis collimating lens and a slow-axis collimating lens.

[0083] The collimated laser 11 is incident on the surface of the first galvanometer 31. After being reflected by the first galvanometer 31, the laser 11 is periodically incident on different positions of the color disk unit 20. The spectrum of the emitted light is modulated by controlling the input signal of the laser unit 10.

[0084] In some embodiments, the specific type of the first galvanometer 31 is not limited; for example, the first galvanometer 31 may be a silicon-based galvanometer or a silicon carbide-based galvanometer.

[0085] In some embodiments, the first galvanometer 31 is a one-dimensional transmission MEMS galvanometer, and the material of the first galvanometer 31 can be silicon carbide-based. The laser 11 changes its deflection angle through the refraction effect generated by the one-dimensional transmission MEMS galvanometer, thereby periodically incident on different positions of the color disk unit 20.

[0086] Please see Figure 5 , Figure 6 and Figure 7In some embodiments, the color disk unit 20 includes multiple color disk sections 24, each with a different color, which are used to convert the laser 11 into incoherent light 21 of different colors. After the first galvanometer 31 changes the transmission direction of the laser 11, the laser 11 is incident on the color disk unit 20. The color disk unit 20 has multiple color disk sections 24 of different colors, and the laser 11 forms incoherent light 21 of different colors after passing through the different color disk sections 24.

[0087] In this embodiment, the plurality of color disk sections 24 include at least one of blue light section, red light section, green light section, yellow light section, and white light section. In this embodiment, there are three color disk sections 24, which are respectively blue light section, red light section, and green light section. The first galvanometer 31 reflects the blue laser, changes the transmission direction of the blue laser, and incident it onto the color disk unit 20 having blue light fluorescent section, red light fluorescent section, and green light fluorescent section, forming red fluorescence 213, green fluorescence 212, and blue fluorescence 211.

[0088] It should be noted that each color disk section 24 is provided with a light-emitting material section, which is used to convert the laser 11 into incoherent light 21.

[0089] The color disk unit 20 is composed of different downconversion luminescent material sections; for example, the luminescent material section includes at least one of phosphorescent material section, fluorescent material section, nanomaterial section, rare earth doped section or mixed fluorescent material section.

[0090] Specifically, the phosphorescent material section includes optical glass containing phosphorescent materials, the fluorescent material section includes optical glass containing fluorescent materials (phosphors, rare earth-doped glass, etc.), the nanomaterial section includes optical glass containing nanomaterials (quantum dots, perovskites, etc.), the rare earth-doped section includes rare earth-doped optical glass, and the fluorescent material section includes composite glass structures containing fluorescent materials.

[0091] In this embodiment, the light-emitting material part is a fluorescent material part, which includes blue fluorescent material, red fluorescent material and green fluorescent material. Blue laser light is incident on the color disk unit 20 which has blue fluorescent material, red fluorescent material and green fluorescent material to form red fluorescent material 213, green fluorescent material 212 and blue fluorescent material 211.

[0092] It should be noted that the arrangement order of multiple fluorescent material sections is not limited and can be set according to the actual situation.

[0093] In some embodiments, the spectral band range of the color wheel unit 20 covers 430 nm to 760 nm.

[0094] Please see Figure 5 , Figure 6 and Figure 7The color disk unit 20 includes an incident surface 22 and an exit surface 23, with the incident surface 22 close to the laser unit 10. The projection device 100 also includes at least one diffractive optical microstructure 25. The diffractive optical microstructure 25 is a type of precision optical element that utilizes the principle of light diffraction (rather than the refraction or reflection of traditional geometric optics) to precisely manipulate the light wavefront. They are typically etched with micron- or nanon-scale fine periodic structures (such as grooves, columnar shapes, or complex relief patterns) on the substrate surface. In the projection system, the diffractive optical microstructure 25 plays a unique and increasingly important role, with its core functions including shaping and homogenization. The specific location of the diffractive optical microstructure 25 is not limited and can be set according to the actual situation; for example, the diffractive optical microstructure 25 can be located on the incident surface 22 or on the exit surface 23.

[0095] In some embodiments, the diffractive optical microstructure 25 is disposed on the incident surface 22, and the diffractive optical microstructure 25 is used to shape the laser 11.

[0096] In some other embodiments, a diffractive optical microstructure 25 is disposed on the exit surface 23, and the diffractive optical microstructure 25 is used to homogenize the laser 11 passing through the color disk unit 20.

[0097] Specifically, the color disk unit 20 converts the blue laser reflected by the first galvanometer 31 into incoherent light 21 of the corresponding color on the color disk. The incident surface 22 of the color disk unit 20 has a diffraction optical microstructure 25 for beam shaping; at the same time, the exit surface 23 of the incoherent light 21 color disk has a diffraction optical microstructure 25 for beam homogenization.

[0098] In some embodiments, the projection device 100 further includes an imaging unit 40, which is disposed on the side of the color wheel unit 20 away from the laser unit 10, and is used to receive incoherent light 21 and form an image.

[0099] Specifically, the type of imaging unit 40 is not limited and can be selected according to the actual situation; for example, imaging unit 40 can be a projection screen or a digital micromirror device.

[0100] In some embodiments, please refer to Figure 3 and Figure 4The projection device 100 also includes a second collimation unit 60, which is located on the side of the color wheel unit 20 away from the laser unit 10. The second collimation unit 60 is used to adjust the parallelism of the incoherent light 21. Although the light of the laser 11 has much better directionality than that of ordinary light sources, it still has a certain degree of divergence angle (ranging from a few degrees to more than ten degrees). This means that the light of the laser 11 will gradually spread out after it comes out of the light source. The second collimation unit 60 recalibrates the originally divergent conical laser 11 into a nearly parallel laser 11 through optical refraction or reflection, thereby providing energy for the laser 11.

[0101] It should be noted that the specific type of the second collimating unit 60 is not limited; for example, the second collimating unit 60 can be a microlens or an aperture stop. The appropriate type can be selected based on the specific circumstances.

[0102] Specifically, the color disk unit 20 converts the blue laser reflected by the first galvanometer 31 into incoherent light 21 of the corresponding color on the color disk. The incident surface 22 of the color disk unit 20 has a diffractive optical microstructure 25 for shaping the laser 11; at the same time, the exit surface 23 of the fluorescent color disk has a diffractive optical microstructure 25 for homogenizing the incoherent light 21. The homogenized incoherent light 21 is then homogenized by the beam-shrinking collimation unit.

[0103] In some embodiments, please continue reading Figure 3 and Figure 4 The galvanometer unit 30 also includes a second galvanometer 32, which is disposed between the imaging unit 40 and the color disk unit 20. The second galvanometer 32 is used to adjust the transmission direction of the incoherent light 21 so that the incoherent light 21 can be projected onto the imaging unit 40. Specifically, the color disk unit 20 converts the blue laser reflected by the first galvanometer 31 into incoherent light 21 of the corresponding color on the color disk. The incident surface 22 of the color disk unit 20 has a diffraction optical microstructure 25 for shaping the laser 11; at the same time, the exit surface 23 of the incoherent light 21 color disk has a diffraction optical microstructure 25 for homogenizing the incoherent light 21. The homogenized incoherent light 21 is then collimated by a beam-shrinking collimation unit, and then the shaped three-color incoherent light 21 is incident on the second galvanometer 32 and projected onto the imaging unit 40 through the second galvanometer 32.

[0104] In some embodiments, the specific type of the second galvanometer 32 is not limited; for example, the second galvanometer 32 may be a silicon-based galvanometer or a silicon carbide-based galvanometer.

[0105] In some embodiments, the galvanometer unit 30 further includes a third galvanometer 33, which is disposed on the side of the second collimation unit 60 opposite to the color disk unit 20. The third galvanometer 33 is used to combine incoherent light 21. Specifically, the color disk unit 20 converts the blue laser reflected by the first galvanometer 31 into incoherent light 21 of the corresponding color on the color disk. The incident surface 22 of the color disk unit 20 has a diffraction optical microstructure 25 for shaping the laser 11; at the same time, the exit surface 23 of the incoherent light 21 color disk has a diffraction optical microstructure 25 for homogenizing the incoherent light 21. The homogenized incoherent light 21 is then collimated by the beam-shrinking collimation unit, and then the shaped three-color incoherent light 21 is combined by the dichroic mirror 332 and incident on the second galvanometer 32, and projected onto the imaging unit 40 by the second galvanometer 32.

[0106] In some embodiments, the specific type of the third galvanometer 33 is not limited; for example, please refer to Figure 3 The third galvanometer 33 can be a dichroic mirror 332. Please refer to [link / reference]. Figure 4 The third galvanometer 33 can be a grating 331.

[0107] Please see Figure 8 , Figure 9 and Figure 10 , Figure 8 This is an image showing the speckle effect of an LBS projection system provided in related technologies. Figure 9 An image showing the speckle effect of an embodiment of the projection device 100 provided in this application; Figure 10 An image showing the speckle effect in another embodiment of the projection device 100 provided in this application.

[0108] Specifically, from Figure 8 , Figure 9 and Figure 10 It can be concluded that Figure 8 The first galvanometer 31 was not set. Figure 9 To set the first galvanometer 31, from Figure 8 and Figure 9 It can be concluded that compared with the scheme without the first galvanometer 31, the speckle is 31.51%, while the scheme with the first galvanometer 31 is about 18.50%. Therefore, the projection device 100 provided in this application can reduce the speckle.

[0109] Figure 10 In the projection device, the first galvanometer 31 has a size of 2mm and a resonant frequency of 1.6kHz. Through optimization, its speckle contrast can be reduced from 18.50% to less than 4% of human eye recognition, meeting automotive-grade requirements in terms of display effect.

[0110] According to a second aspect of this application, an optical device is provided, which includes the projection device 100 described above. This optical device possesses all the beneficial effects of the projection device 100 described above, which will not be elaborated further herein.

[0111] According to a third aspect of this application, a vehicle is provided that includes the aforementioned optical device, and the vehicle has all the beneficial effects of the aforementioned optical device, which will not be repeated here.

[0112] The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this application does not make any specific restrictions.

[0113] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0114] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0115] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0116] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A projection device, characterized in that, include: A galvanometer unit includes a first galvanometer, which is configured to be disposed on the transmission path of the light beam; as well as, A color wheel unit is disposed on one side of the galvanometer unit and is configured to receive the light beam and convert the light beam into incoherent light; The first galvanometer is used to adjust the transmission direction of the light beam so that the light beam can enter the color disk unit.

2. The projection device according to claim 1, characterized in that, It also includes a laser unit, which is located on the side of the first galvanometer away from the color wheel unit. The laser unit is capable of emitting laser light, and the laser light is capable of emitting the beam.

3. The projection device according to claim 2, characterized in that, The laser unit includes a blue laser emitter, which is capable of emitting blue laser light.

4. The projection device according to claim 3, characterized in that, The blue laser includes single-mode blue laser or multi-mode blue laser.

5. The projection device according to claim 3, characterized in that, The blue laser is a single-mode blue laser, and the collimated spot size of the single-mode blue laser is L1, 50μm≤L1≤120μm, and the imaging distance of the collimated spot is 150mm-300mm.

6. The projection device according to claim 3, characterized in that, The blue laser is a single-mode blue laser with a power of P1, where 40mW ≤ P1 ≤ 1W.

7. The projection device according to claim 3, characterized in that, The blue laser is a multimode blue laser, and the collimated spot size of the multimode blue laser is L2, 200μm≤L2≤300μm, and the imaging distance of the collimated spot is 150mm-300mm.

8. The projection device according to claim 3, characterized in that, The blue laser is a multimode blue laser, and the power of the multimode blue laser is P2, where 1W≤P2≤20W.

9. The projection device according to claim 1, characterized in that, The first galvanometer includes either a projection galvanometer or a reflection galvanometer.

10. The projection device according to claim 9, characterized in that, It also includes a laser unit; The first galvanometer is a transmission galvanometer, and the laser unit, the first galvanometer, and the color disk unit are spaced apart in the direction of the beam transmission path.

11. The projection device according to claim 9, characterized in that, It also includes a laser unit; The first galvanometer is a reflective lens, the laser unit and the first galvanometer are spaced apart along a first direction, and the first galvanometer and the color disk unit are spaced apart along a second direction; Wherein, the first direction is the transmission direction of the light beam, and the second direction intersects with the first direction.

12. The projection device according to any one of claims 1-11, characterized in that, It also includes a first collimation unit, which is located between the laser unit and the galvanometer unit, and is used to adjust the parallelism of the laser.

13. The projection device according to any one of claims 1-11, characterized in that, The incoherent light includes at least one of fluorescence or phosphorescence.

14. The projection device according to any one of claims 1-11, characterized in that, The color disk unit includes multiple color disk sections, each with a different color, and these multiple color disk sections are used to convert laser light into incoherent light of different colors.

15. The projection device according to claim 14, characterized in that, The multiple color wheel sections include at least one of the following: blue light section, red light section, green light section, yellow light section, and white light section.

16. The projection device according to claim 14, characterized in that, Each of the color disks is provided with a light-emitting material portion, which is used to convert the light beam into the incoherent light.

17. The projection device according to claim 16, characterized in that, The luminescent material portion includes at least one of phosphorescent material portion, fluorescent material portion, nanomaterial portion, rare earth doped portion, or mixed fluorescent material portion.

18. The projection device according to any one of claims 1-11, characterized in that, The color wheel unit includes an incident surface and an exit surface, with the incident surface being close to the laser unit; The projection device further includes at least one diffractive optical microstructure, wherein the at least one diffractive optical microstructure is disposed on the incident surface and / or the exit surface.

19. The projection device according to claim 18, characterized in that, The diffractive optical microstructure is disposed on the incident surface, and the diffractive optical microstructure is used to shape the laser; and / or, The diffractive optical microstructure is disposed on the exit surface, and the diffractive optical microstructure is used to homogenize the laser light passing through the color disk unit.

20. The projection device according to any one of claims 1-11, characterized in that, It also includes an imaging unit, which is located on the side of the color wheel unit away from the first galvanometer. The imaging unit is used to receive the incoherent light and form an image.

21. The projection device according to claim 20, characterized in that, The imaging unit includes a projection screen or a digital micromirror device.

22. The projection device according to claim 20, characterized in that, The galvanometer unit further includes a second galvanometer, which is disposed between the imaging unit and the color wheel unit. The second galvanometer is used to adjust the transmission direction of the incoherent light so that the incoherent light can be projected onto the imaging unit.

23. The projection device according to claim 22, characterized in that, The second galvanometer includes a silicon-based galvanometer or a silicon carbide-based galvanometer.

24. The projection device according to any one of claims 1-11, characterized in that, It also includes a second collimation unit, which is located on the side of the color disk unit away from the first galvanometer. The second collimation unit is used to adjust the parallelism of the incoherent light.

25. The projection device according to claim 24, characterized in that, The second collimation unit includes a microlens or an aperture.

26. The projection device according to claim 24, characterized in that, The galvanometer unit further includes a third galvanometer, which is located on the side of the second collimating unit away from the color wheel unit. The third galvanometer is used to combine the incoherent light.

27. The projection device according to claim 26, characterized in that, The third galvanometer includes a dichroic mirror or a grating.

28. The projection device according to any one of claims 1-11, characterized in that, The first galvanometer includes a silicon-based galvanometer or a silicon carbide-based galvanometer.

29. The projection device according to any one of claims 1-11, characterized in that, The spectral range of the color wheel unit covers 430nm to 760nm.

30. An optical device, characterized in that, Includes the projection device as described in any one of claims 1-29.

31. A vehicle, characterized in that, Includes the optical device as described in claim 30 or the projection device as described in any one of claims 1-29.

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