Projection module, vehicle lamp and vehicle

Abstract

The utility model provides a projection module which can be applied to a vehicle lamp and a vehicle. The projection module provided by the utility model is small in size and high in imaging quality, and can achieve an ultra-near-field greeting projection effect. The projection module comprises an image generation unit and a glued Fresnel prism, the glued Fresnel prism comprises at least one glued surface, a first outer surface and a second outer surface, and the at least one glued surface and the second outer surface are sawtooth surfaces. Wherein the image generation unit is used for emitting a first light beam to the glued Fresnel prism, and the glued Fresnel prism emits a second light beam based on the first light beam. The included angle between the second light beam and the horizontal direction is a first included angle, and the sawtooth inclination angle of the sawtooth face is determined based on the first included angle.

Description

Technical Field

[0001] This application relates to the field of optical display, and in particular, to a projection module, a vehicle headlight, and a vehicle. Background Art

[0002] In the era of intelligent driving vehicles, the emergence of intelligent vehicle headlights endows vehicle headlights with more personalized and scenario-based features, and consumers have more personalized requirements for vehicle headlights. However, traditional welcome lights are realized by a film with a specific pattern printed on it, which has the disadvantages of a single pattern style and a small projection range. Summary of the Utility Model

[0003] This application provides a projection module, a vehicle headlight, and a vehicle. The projection module provided by this application is small in volume and high in imaging quality, and can achieve an ultra-short-distance projection effect.

[0004] In a first aspect, an embodiment of this application provides a projection module, which includes an image generation unit and a glued Fresnel prism. The glued Fresnel prism includes at least one glued surface, a first outer surface, and a second outer surface. The at least one glued surface and the second outer surface are serrated surfaces. Wherein, the image generation unit is configured to emit a first light beam to the glued Fresnel prism, and the glued Fresnel prism is configured to emit a second light beam based on the first light beam. The angle between the second light beam and the horizontal direction is a first angle, and the serration inclination angle of the serrated surface is determined based on the first angle.

[0005] Based on the above solution, this application determines the inclination angle of the serrated surface of the glued Fresnel prism through the first angle, so that the projection module can use the designed glued Fresnel prism to achieve the projection effect of the desired angle. Since the inclination angle of the serrated surface of the glued Fresnel prism is designed based on the first angle, the projection distance of the projection module provided by this application will not be affected by the spatial layout of the projection module. Therefore, it has a flexible design of the projection angle and can achieve the projection effect of different projection angles according to the application scenario of the projection module. When applied to the welcome scenario, the projection module provided by this application can achieve an ultra-short-distance welcome projection, thereby enhancing the user experience. Since the glued Fresnel prism has a glued surface, compared with the solution of multiple Fresnel prisms, the solution of this application makes the volume of the projection module smaller. At the same time, the glued surface can weaken the stray light and ghost images caused by interface reflection, achieving the purpose of improving the quality of the projection image.

[0006] In combination with the first aspect, in some implementation manners of the first aspect, the first angle is greater than 6°.

[0007] It should be noted that the projection module provided in this application can design different glued Fresnel prisms according to the application scenarios, so as to meet the different application requirements of the projection module. When the projection module provided in this application is applied to the near-field welcome scenario, the deflection angle of the outgoing light beam relative to the horizontal direction can be greater than 6°, so as to realize the welcome projection in the ultra-close range. It can be understood that the projection module of this application can also be applied to other scenarios. In other scenarios, such as the long-distance projection scenario, the range of the first included angle can also be less than or equal to 6°.

[0008] Combined with the first aspect, in some implementation manners of the first aspect, the range of the sawtooth inclination angle of the sawtooth surface is [0°, 80°].

[0009] It should be noted that in the solution of this application, the sawtooth inclination angle is the included angle between the sawtooth and the plane perpendicular to the optical axis.

[0010] Combined with the first aspect, in some implementation manners of the first aspect, the sawtooth inclination angle of the sawtooth surface is determined based on the first included angle, including: when the material of the glued Fresnel prism is determined, adjusting the sawtooth inclination angle of the sawtooth surface based on the first included angle, so that the chromatic aberration of the glued Fresnel prism meets the preset range.

[0011] Combined with the first aspect, in some implementation manners of the first aspect, the surface type of the sawtooth surface is an inclined plane.

[0012] Designing the surface type of the sawtooth surface as an inclined plane can reduce the complexity of design and process.

[0013] Combined with the first aspect, in some implementation manners of the first aspect, the projection module further includes a transmission unit, the transmission unit is connected to the glued Fresnel prism, and the transmission unit is configured to move the glued Fresnel prism in front of the image generation unit, so that the first light beam emitted by the image generation unit is projected onto the glued Fresnel prism, or is configured to move the glued Fresnel prism so that the first light beam emitted by the image generation unit cannot be projected onto the glued Fresnel prism.

[0014] Based on the above solution, by moving the glued Fresnel prism through the transmission unit, the projection module emits a second light beam or a first light beam with different angles relative to the horizontal direction, so that the projection module provided in this application can be applied to different scenarios.

[0015] Combined with the first aspect, in some implementation manners of the first aspect, the included angle between the first light beam and the horizontal direction is a second included angle, and the first included angle is greater than the second included angle.

[0016] In combination with the first aspect, in certain implementations of the first aspect, an anti-reflection layer is provided on the first outer surface and / or the second outer surface, and the anti-reflection layer is used to reduce the reflection of stray light on the first outer surface and / or the second outer surface.

[0017] In combination with the first aspect, in certain implementations of the first aspect, an absorption layer is provided on the vertical sawtooth surface of the second outer surface, and the absorption layer is used to absorb stray light.

[0018] In combination with the first aspect, in certain implementations of the first aspect, a light extinction structure member is provided on the first outer surface and / or the second outer surface, the light extinction structure member is used to absorb stray light, and each shielding area of the light extinction structure member corresponds one-to-one to the sawtooth sharp angle and the bottom angle of the sawtooth surface.

[0019] Based on the above solutions, by providing at least one of an anti-reflection layer, an absorption layer or a light extinction structure, the purpose of improving the quality of the projection image can be achieved, thereby improving the user experience.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the first outer surface is a spherical surface or a free-form surface or a planar surface.

[0021] It can be understood that when the first surface is a spherical surface or a free-form surface, the first surface can compensate for the defocus of the image generation unit and improve the clarity of the projection image. When the first surface is a planar surface, the processing difficulty and the design difficulty can be reduced.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the glued Fresnel prism is a double-glued Fresnel prism, the double-glued Fresnel prism includes a first lens and a second lens, and the first lens and the second lens are formed by bonding trapezoidal prisms.

[0023] Forming a glued Fresnel prism by bonding trapezoidal prisms can reduce the processing difficulty and the process complexity.

[0024] In combination with the first aspect, in certain implementations of the first aspect, the glued Fresnel prism is a triple-glued Fresnel prism.

[0025] Based on the above solutions, the triple-glued Fresnel prism can further eliminate the chromatic aberration of the projection module, thereby improving the projection quality of the projection module.

[0026] Second aspect, an embodiment of the present application provides a vehicle lamp, which includes a control system and the projection module provided by the first aspect and any implementation manner of the first aspect. The control system is connected to the transmission unit. The control system is configured to input the state information of the projection module to the transmission unit. The state information is the first state information or the second state information. The first state information corresponds to the first state, and the second state information corresponds to the second state.

[0027] Third aspect, an embodiment of the present application provides a vehicle, which is characterized by including the body of the vehicle and the projection module provided by the first aspect and any implementation manner of the first aspect. The projection module is arranged on the body. Description of the Drawings

[0028] Figure 1 It is a schematic structural block diagram of a vehicle 100 applicable to an embodiment of the present application.

[0029] Figure 2 It is a schematic structural diagram of the projection module 200 provided by an embodiment of the present application.

[0030] Figure 3 It is a schematic diagram of the first glued Fresnel prism 220 provided by an embodiment of the present application.

[0031] Figure 4 It is a schematic diagram of a light extinction structure member 400 provided by an embodiment of the present application.

[0032] Figure 5 It is a schematic diagram of the second glued Fresnel prism 220 provided by an embodiment of the present application.

[0033] Figure 6 It is a schematic diagram of the third glued Fresnel prism 220 provided by an embodiment of the present application.

[0034] Figure 7 It is a schematic structural diagram of an image generation unit 210 applicable to an embodiment of the present application.

[0035] Figure 8 It is a schematic optical path structure diagram of the second projection module 800 provided by an embodiment of the present application.

[0036] Figure 9 It is a schematic diagram of the working modes of the projection module 800 in the first state and the second state in an embodiment of the present application.

[0037] Figure 10 It is a schematic diagram of the functions of a vehicle lamp in an embodiment of the present application. Detailed Embodiments

[0038] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0039] To facilitate the understanding of the embodiments of the present application, the following explanations are made.

[0040] First, in the written description or the terms in the accompanying drawings of the embodiments of the present application shown below, terms such as "first", "second", etc. and various numerical numbers are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. For example, the first light beam and the second light beam are different light beams, etc.

[0041] Second, the term "comprising" and any variations thereof in the embodiments of the present application shown below are intended to cover non-exclusive inclusion. For example, a system, product or device comprising a series of units does not necessarily have to be limited to those units clearly listed, but may include other units not clearly listed or inherent to these products or devices.

[0042] Third, in the embodiments of the present application, words such as "exemplarily" or "for example" are used to represent examples, illustrations or explanations. Embodiments or design solutions described as "exemplarily" or "for example" should not be construed as being more preferred or more advantageous than other embodiments or design solutions. The use of words such as "exemplarily" or "for example" is intended to present relevant concepts in a specific way for easy understanding.

[0043] Fourth, in the accompanying drawings of the present application, for the convenience of illustration, the thickness, size and shape of each optical element have been slightly exaggerated. Specifically, the shapes of the optical elements shown in the drawings are shown by way of examples, and the drawings are only examples and not drawn strictly to scale.

[0044] Fifth, unless otherwise defined, all terms (including technical terms and scientific terms) used in the present application have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0045] Pixelated headlights have obvious advantages in both the diversity of welcome patterns and the projection range, and have the potential to become a new generation of intelligent welcome projection lights. Currently, the vertical field of view of existing pixelated headlights is about 7°, however, the projection distance in front of the vehicle is usually greater than 8m. Therefore, it is difficult to achieve a good welcome effect with a small vertical field of view. In order to shorten the distance of the welcome projection, the pixelated headlights are usually tilted downward as a whole by a certain angle using a motor. However, the adjustment range of this solution is very limited, usually less than 6°, and at the same time, it will occupy the space inside the lamp, resulting in a significant increase in the difficulty of the styling layout.

[0046] In view of this, the present application provides a projection module that can be applied to pixelated projection headlamps. By occupying a smaller volume, it can deflect broadband light beams, thereby meeting the ultra-short-range projection requirements of pixelated headlamps, such as in the welcome scenario, and having excellent projection effects and projection quality.

[0047] First, the vehicle to which the projection module provided in the present application can be applied will be described below. Refer to Figure 1 as shown, where Figure 1 is a functional block diagram of an embodiment of the vehicle provided in the present application. In one embodiment, vehicle 100 is configured to be in a fully or partially autonomous driving mode. For example, vehicle 100 can control itself while in the autonomous driving mode, and can determine the current state of the vehicle and its surrounding environment through manual operation, determine the possible behaviors of at least one other vehicle in the surrounding environment, and determine the confidence level corresponding to the likelihood of the other vehicle performing the possible behaviors, and control vehicle 100 based on the determined information. When vehicle 100 is in the autonomous driving mode, vehicle 100 can be set to operate without interacting with people. Vehicle 100 may include various systems, and each system may include multiple components. In addition, each system and component of vehicle 100 can be interconnected by wire or wirelessly.

[0048] The vehicle shown in this embodiment includes a sensing system 120, which may include several sensors for sensing information about the environment around the vehicle 100. For example, the sensing system 120 may include a positioning system 121 (the positioning system may be a global positioning system (GPS) system, or a Beidou system or other positioning systems), an inertial measurement unit (IMU) 122, a radar 123, a lidar 124, and a camera 125. The sensing system 120 may also include sensors for monitoring the internal systems of the vehicle 100 (such as an in-vehicle air quality monitor, a fuel gauge, an oil temperature gauge, etc.). Sensor data from one or more of these sensors can be used to detect objects and their corresponding characteristics (position, shape, orientation, speed, etc.). Such detection and identification are key functions for the safe operation of the autonomous vehicle 100. The positioning system 121 can be used to estimate the geographical location of the vehicle 100. The IMU 122 is used to sense changes in the position and orientation of the vehicle 100 based on inertial acceleration. In one embodiment, the IMU 122 can be a combination of an accelerometer and a gyroscope. The radar 123 can use radio signals to sense objects within the surrounding environment of the vehicle 100. In some embodiments, in addition to sensing objects, the radar 123 can also be used to sense the speed and / or forward direction of the objects. This embodiment does not limit the specific type of the radar 123. For example, the radar 123 can be a millimeter-wave radar or a lidar, etc. The lidar 124 can use lasers to sense objects in the environment where the vehicle 100 is located. In some embodiments, the lidar 124 may include one or more laser sources, a laser scanner, and one or more detectors, as well as other system components. The camera 125 can be used to capture multiple images of the surrounding environment of the vehicle 100. The camera 125 can be a static camera, a video camera, a mono / stereo camera, or an infrared imager.

[0049] The vehicle 100 also includes an advanced driving assistance system (ADAS) 110. The ADAS 110 senses the surrounding environment at any time during the vehicle's driving process, collects data, identifies, detects, and tracks static and dynamic objects, and combines navigation map data for system operation and analysis, so as to let the driver perceive possible dangers in advance and effectively improve the comfort and safety of vehicle driving. For example, the ADAS 110 can control the vehicle through the data obtained by the sensing system 120. Another example is that the ADAS 110 can control the vehicle through in-vehicle data, where the in-vehicle data can be the main data on the vehicle dashboard (fuel consumption, engine speed, temperature, etc.), vehicle speed information, steering wheel angle information, or vehicle body attitude data, etc.

[0050] The ADAS 110 can control the vehicle in one or more of the following ways: The ADAS 110 adjusts the forward direction of the vehicle 100. The ADAS 110 controls the operating speed of the vehicle's engine and thus controls the speed of the vehicle 100. The ADAS 110 operates on the images captured by the camera 125 to identify objects and / or features in the surrounding environment of the vehicle 100. In some embodiments, the ADAS 110 can be used to map the environment, track objects, estimate the speed of objects, and so on. The ADAS 110 determines the driving route of the vehicle 100. In some embodiments, the ADAS 110 can combine one or more predetermined map data from the sensing system 120 to determine the driving route for the vehicle 100. The ADAS 110 can identify, evaluate, and avoid or otherwise navigate around potential obstacles in the environment of the vehicle 100.

[0051] The vehicle 100 interacts with external sensors, other vehicles, other computer systems, or users through the peripheral device 130. The peripheral device 130 can include a wireless communication system 131, an in-vehicle computer 132, a microphone 133, and / or a speaker 134.

[0052] In some embodiments, the peripheral device 130 provides a means for the user of the vehicle 100 to interact with the user interface. For example, the in-vehicle computer 132 can provide information to the user of the vehicle 100. The user interface can also operate the in-vehicle computer 132 to receive user input. The in-vehicle computer 132 can be operated through a touch screen. In other cases, the peripheral device 130 can provide a means for the vehicle 100 to communicate with other devices located within the vehicle. For example, the microphone 133 can receive audio (e.g., voice commands or other audio inputs) from the user of the vehicle 100. Similarly, the speaker 134 can output audio to the user of the vehicle 100.

[0053] The wireless communication system 131 can communicate wirelessly with one or more devices directly or via a communication network. For example, the wireless communication system 131 can use 3rd-generation (3G) cellular communication technologies, such as Code Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS). The wireless communication system 131 can use 4th-generation mobile communication technology (4G) cellular communication, such as Long Term Evolution (LTE). The wireless communication system 131 can also use 5th-generation mobile communication technology (5G) cellular communication. The wireless communication system 131 can utilize Wireless Local Area Network (WLAN) communication. In some embodiments, the wireless communication system 131 can communicate directly with devices using an infrared link, Bluetooth, or ZigBee protocol. The wireless communication system 131 can also utilize various vehicle communication systems. For example, the wireless communication system 131 can include one or more dedicated short-range communications (DSRC) devices, which can include public and / or private data communications between vehicles and / or roadside stations.

[0054] Some or all of the functions of the vehicle 100 are controlled by the computer system 140. The computer system 140 can control the functions of the vehicle 100 based on inputs received from various systems (e.g., the sensing system 120, the ADAS 110, the peripheral device 130) and from the user interface. The computer system 140 can include at least one processor 141 that executes instructions stored in a non-transitory computer-readable medium such as the memory 142. The computer system 140 can also be a plurality of computing devices that control individual components or subsystems of the vehicle 100 in a distributed manner.

[0055] In this embodiment, the type of the processor 141 is not limited. For example, the processor 141 may be one or more field-programmable gate arrays (FPGA), application-specific integrated circuits (ASIC), system on chips (SoC), central processor units (CPU), network processors (NP), digital signal processing circuits (DSP), microcontroller units (MCU), programmable logic devices (PLD), or other integrated chips, or any combination of the above chips or processors, etc. Among them, the processor 141 may be located inside the vehicle, or the processor 141 may be located away from the vehicle and communicate with the vehicle wirelessly.

[0056] In some embodiments, the memory 142 may contain instructions (e.g., program logic), and the instructions can be executed by the processor 141 to perform various functions of the vehicle 100. In addition to the instructions, the memory 142 can also store data, such as map data, route information, the position, direction, speed of the vehicle, and other vehicle data. The information stored in the memory 142 can be used by the vehicle 100 and the computer system 140 during the operation of the vehicle 100 in autonomous, semi-autonomous, and / or manual modes.

[0057] The vehicle 100 shown in this embodiment further includes a projection module 150. The projection module 150 may be, for example, a pixelated headlight module, etc. In this application, the projection module 150 has the advantages of small volume and high projection quality. It can not only meet the ultra-near-field welcome needs, but also take into account the lighting needs in some embodiments, so that the projection module 150 can be applied to more scenarios. The specific structure of the projection module 150 will be described below in combination with each embodiment.

[0058] It should be noted that the projection module 150 shown in this embodiment can be applied not only to vehicles, but also to driving tools such as ships, airplanes, and helicopters.

[0059] The solution of this application relates to glued Fresnel prisms. The various Fresnel prisms provided in the solution of this application can be applied not only to pixelated headlights, but also to fields related to optical imaging and optical projection, such as cameras, projectors, microscopes, telescopes, lithography machines, etc. In addition, it can also be applied to any system using the refraction principle, including acoustic systems, acousto-optic systems, etc., which is not limited in this application.

[0060] Figure 2 This is a schematic structural diagram of the first projection module 200 provided by an embodiment of the present application. It can be understood that the projection module 200 can be applied to a vehicle as shown in Figure 1 as an example of the projection module 150. As shown in Figure 2 the projection module 200 includes an image generation unit 210 and a glued Fresnel prism 220. Specifically, when the projection module 200 performs near-field projection, the image generation unit 210 is configured to emit a first light beam to the glued Fresnel prism. The glued Fresnel prism 220 is configured to emit a second light beam based on the first light beam, and the angle between the second light beam and the horizontal direction is a first angle. Wherein, the glued Fresnel prism 220 includes at least one glued surface, a first outer surface, and a second outer surface, and at least one glued surface and the second outer surface are serrated surfaces, and the serration inclination angle of the serrated surface is determined based on the first angle.

[0061] It should be noted that the serration inclination angle is the angle between the serration and the plane perpendicular to the optical axis. In the solution of the present application, the range of the serration inclination angle of the serrated surface is [0°, 80°], that is, the serration inclination angle of the glued surface is one of [0°, 80°], and the serration inclination angle of the second outer surface is selected as one of [0°, 80°], and the serration inclination angles of the glued surface and the second outer surface may be the same or different.

[0062] In the projection module 200 of the present application, the glued Fresnel prism 220 is used. For the glued Fresnel prism 220, it can deflect the direction of the incident first light beam by a certain angle. At the same time, the glued Fresnel prism 220 can glue at least two prisms together to form an integrated optical system, so that while the volume of the projection module 200 is reduced, the stray light and ghost images caused by the reflection at the interface are weakened through the glued surface, making the projection module have good optical performance. It should be noted that in the solution of the present application, the first light beam emitted by the image generation unit 210 can enter the glued Fresnel prism 220 through the first outer surface. At this time, the second light beam exits from the second outer surface of the glued Fresnel prism 220, or the first light beam emitted by the image generation unit 210 can enter the glued Fresnel prism 220 through the second outer surface. At this time, the second light beam exits from the first outer surface of the glued Fresnel prism 220. The present application does not make any limitations.

[0063] In the solution of this application, the glued Fresnel prism 220 includes a serrated surface, and the serration inclination angle of the serrated surface is related to the first included angle of the second light beam emitted by the glued Fresnel prism 220. That is, in the solution of this application, the serration inclination angle of the glued Fresnel prism 220 can be determined by the first included angle, so as to achieve the projection effect of the second light beam emitted by the projection module 200 at the first included angle. In other words, the projection module 200 provided in this application can design the serration inclination angle of the glued Fresnel prism 220 according to the first included angle of the second light beam emitted by the projection module 200 in the desired projection scenario, so as to achieve projection scenarios under different first included angles. It can be understood that in the solution of this application, when the first included angle is greater than 6°, a super near-field projection effect can be achieved. When the projection module 200 is applied to a pixel headlight, a super near-field welcome projection effect can be achieved, improving the user experience.

[0064] Next, in combination with Figures 3 to 6 The specific structures of three types of glued Fresnel prisms 220 provided in the embodiments of this application will be described in detail.

[0065] Figure 3 It is a schematic diagram of the first type of glued Fresnel prism 220 provided in the embodiment of this application. As Figure 3 shown, Figure 3 In (a) is a side view of the glued Fresnel prism 220. Specifically, the glued Fresnel prism 220 is a double-glued Fresnel prism, which is composed of a first lens 310 and a second lens 320. The first lens 310 includes a first surface 311 and a second surface 312. The second lens 320 includes a third surface 321 and a fourth surface 322. Among them, the surface shapes of the second surface 312 of the first lens 310 and the third surface 321 of the second lens 320 coincide, and they are pasted together by gluing to form a glued surface. The first surface 311 and the fourth surface 322 are respectively the first outer surface and the second outer surface of the glued Fresnel prism 220.

[0066] Specifically, in Figure 3 the shown glued Fresnel prism 220, the second surface 312, the third surface 321, and the fourth surface 322 are serrated surfaces. According to the above Figure 2As can be seen from the description, the sawtooth inclination angles of the second surface 312, the third surface 321, and the fourth surface 322 are determined based on the first included angle. Specifically, after determining the deflection angle of the principal ray required by the system for the cemented Fresnel prism 220 (i.e., the first included angle) and selecting the materials of the first lens 310 and the second lens 320 of the cemented Fresnel prism 220, according to the principle of achromatism, incident light of different wavelengths passes through the cemented Fresnel prism 220 and exits at the same first included angle at the same position, thereby realizing the reverse design of the sawtooth inclination angle. It can be understood that the optical design and optimization process of the sawtooth inclination angle can be carried out through optical software or optical formulas, scripts, etc.

[0067] The solution of this application does not limit the surface shape of the sawtooth, that is, the sawteeth of the second surface 312, the third surface 321, and the fourth surface 322 can be inclined planes or free-form surfaces. To simplify the processing difficulty and design difficulty, the surface shape of the sawtooth is usually selected as an inclined plane.

[0068] It can be understood that since the surface shapes of the second surface 312 and the third surface 321 coincide, in order to make the second surface 312 and the third surface 321 fully engaged, in the solution of this application, the sawtooth pitches of the second surface 312 and the third surface 321 are the same. It can be understood that the sawtooth pitch between the second surface 312 and the third surface 321 is related to the processing technology of the materials of the first lens 310 and the second lens 320. Exemplarily, when the material of the first lens 310 or the second lens 320 is plastic, the sawtooth pitch can be selected as 4 mm according to the injection molding process. When the material of the first lens 310 or the second lens 320 is glass, the sawtooth pitch can be selected as 2 mm according to the cold processing technology. It should be noted that this application does not limit the sawtooth pitch between the third surface 321 and the fourth surface 322, which can be the same or different.

[0069] Optionally, the first surface 311 is a flat surface, a serrated surface, a spherical surface or a free-form surface. When the first surface 311 is a serrated surface, the present application does not limit the serration pitch between the first surface 311 and the second surface 312, that is, the serration pitch of the first surface 311 may be the same as or different from the serration pitch of the second surface 312. It can be understood that when the first surface 311 is a serrated surface, the surface profile of the serrations on the first surface 311 may be an inclined plane or a free-form surface, which is not limited in the present application. Similarly, the serration inclination angle of the first surface 311 can be determined according to the deflection angle of the principal ray by the glued Fresnel prism 220, the materials of the first lens 310 and the second lens 320, and the achromatic aberration requirements of the projection module 200 for the glued Fresnel prism 220. The serration inclination angle of the serrated surface of the first surface 311 is one of [0°, 80°]. When the first surface 311 is a spherical surface or a free-form surface, it can be used to compensate for the defocus of the image generation unit 210, so as to achieve the effect of clear near-field imaging.

[0070] It should be noted that the present application does not limit the materials of the first lens 310 and the second lens 320 of the glued Fresnel prism 220. Optionally, the materials of the first lens 310 and the second lens 320 are plastics, glass, crystals and any combination thereof. Among them, plastic lenses can be processed by precision machining, injection molding, nanoimprinting, etc., such as polymethyl methacrylate (PMMA), polycarbonate (PC), etc. Glass lenses can be common optical glasses such as H-K9L material, H-ZF1 material, etc., and are processed by cold working, precision machining, hot embossing, nanoimprinting, etc. It can be understood that in order to achieve the effect of achromatic aberration, the materials of the first lens 310 and the second lens 320 are set differently.

[0071] It should also be noted that the present application does not limit the shapes of the first lens 310 and the second lens 320. Optionally, the shapes of the first lens 310 and the second lens 320 are circular, rectangular or any other shape as required. Exemplarily, Figure 3 in (b) and Figure 3 in (c) are the front views of the glued Fresnel prism 220. Among them, Figure 3 the aperture shape of the glued Fresnel prism 220 corresponding to (b) in is circular, Figure 3 the aperture shape of the glued Fresnel prism 220 corresponding to (c) in is rectangular.

[0072] To reduce the stray light caused by reflection on the light - passing surface of the glued Fresnel prism 220, in some embodiments, an anti - reflection layer can be added at the interface between the glued Fresnel prism 220 and air. That is, an anti - reflection layer is added on the first surface 311 and / or the fourth surface 322. Exemplarily, the anti - reflection layer can be an anti - reflection film.

[0073] Optionally, to reduce the strong reflection of the saw - tooth vertical surface of the fourth surface 322 under grazing incidence, a light - absorbing layer can be provided on the saw - tooth vertical surface of the fourth surface 322. It can be understood that when the first surface 311 is a saw - tooth surface, a light - absorbing layer can also be provided on the saw - tooth vertical surface of the first surface 311.

[0074] In addition, to reduce the reflection of the saw - tooth vertical surface of the fourth surface 322 under grazing incidence and the stray light at the saw - tooth sharp corners and bottom corners, in some embodiments, a light - absorbing layer can be added in the vertical projection area of the saw - tooth sharp corners and bottom corners of the fourth surface 322, including but not limited to methods such as inking, screen printing, film pasting, coating, etc. Or, in some other embodiments, stray light can be blocked by adding a light - extinction structure on the fourth surface 322, that is, absorbing the stray light. Among them, the light - extinction structure absorbs the stray light through a horizontal shielding area, and this horizontal area covers the saw - tooth sharp corners and bottom corners, that is, the saw - tooth sharp corners and bottom corners of each saw - tooth correspond one - to - one with the horizontal shielding area of the light - extinction structure. At the same time, the width of the horizontal shielding area can be designed according to the saw - tooth sharp corners and bottom corners of each saw - tooth to block the stray light from entering the saw - teeth, thereby avoiding the appearance of stray light or ghost images. Optionally, the light - extinction structure can be placed closely against the first surface 311 and / or the fourth surface 322 of the lens, or can be arranged at a certain distance from the first surface 311 and / or the fourth surface 322. Exemplarily, Figure 4 is a schematic diagram of a light - extinction structure 400 provided by an embodiment of the present application. As Figure 4 shown in (a) of, the shape of the light - extinction structure 400 is similar to a "ladder" shape, where the "beam" of the "ladder" is used to cover the sharp corners and bottom corner areas of the glued Fresnel prism 220 and corresponds one - to - one with the saw - tooth sharp corners and bottom corners of the glued Fresnel prism 220. When Figure 4 in (a) is set on the Figure 3 shown glued Fresnel prism 220, the glued Fresnel prism 220 including the light - extinction structure 400 is as Figure 4 shown in (b) of.

[0075] Exemplarily, combining Figure 3 in (a) and Figure 3 in (b), Table 1 shows the relevant optical data of a double - glued Fresnel prism with a circular aperture provided by an embodiment of the present application.

[0076] Table 1

[0077]

[0078] Combined with Figure 3 (a) in Figure 3 and (c) in, Table 2 shows the relevant optical data of a double - glued Fresnel prism with a rectangular aperture provided by an embodiment of the present application.

[0079] Table 2

[0080]

[0081] It can be understood that the values in Table 1 and Table 2 above are only examples provided by the embodiments of the present application and do not constitute a limitation on the glued Fresnel prism 220 protected by the present application. That is, under the solution of the present application, more double - glued Fresnel prisms can be designed according to requirements, not limited to those shown in Table 1 or Table 2 above.

[0082] Figure 5 This is a schematic diagram of the second glued Fresnel prism 220 provided by an embodiment of the present application. As Figure 5 shown, Figure 5 (a) in is a side view of the glued Fresnel prism 220. Specifically, the glued Fresnel prism 220 is a double - glued Fresnel prism, which is composed of a first lens 510 and a second lens 520. The first lens 510 includes a first surface 511 and a second surface 512. The second lens 520 includes a third surface 521 and a fourth surface 522. Among them, the surface types of the second surface 512 of the first lens 510 and the third surface 521 of the second lens 520 coincide and are pasted together by gluing to form a glued surface. The first surface 511 and the fourth surface 522 are respectively the first outer surface and the second outer surface of the glued Fresnel prism 220.

[0083] Different from Figure 3 the first glued Fresnel prism 220 shown, in Figure 5 the second glued Fresnel prism 220 shown, both the first lens 510 and the second lens 520 are formed by bonding trapezoidal prisms. It can be understood that the processing of trapezoidal prisms is easier than that of the overall Fresnel prism. Therefore, using trapezoidal prisms to make Fresnel prisms can achieve the effect of simplifying the process.

[0084] It can be understood that in Figure 5In the glued Fresnel prism 220 shown, the second surface 512, the third surface 521, and the fourth surface 522 are the inclined surfaces of the trapezoidal prism. The inclination angle of this inclined surface is also determined based on the first included angle. That is, based on the deflection angle of the main ray by the glued Fresnel prism 220 required by the system (i.e., the first included angle), and the materials of the first lens 510 and the second lens 520, reverse design and optimization are carried out according to the achromatic principle through optical software, optical formulas, scripts, etc.

[0085] Similarly, the surface profiles of the second surface 512, the third surface 521, and the fourth surface 522 can be inclined planes or free-form surfaces.

[0086] It can be understood that in order to make the second surface 512 completely coincide with the third surface 521, the heights of each trapezoidal prism are equal.

[0087] Optionally, the first surface 511 can be a plane, an inclined surface, a spherical surface, or a free-form surface, which is not limited in this application. When the first surface 311 is an inclined surface, the inclination angle of this inclined surface can be determined according to the deflection angle of the main ray by the glued Fresnel prism 220, the materials of the first lens 510 and the second lens 520, and the achromatic aberration requirements of the projection module 200 for the glued Fresnel prism 220. The inclination angle of the inclined surface of the first surface 511 is one of [0°, 80°]. Similarly, in order to achieve a clearer projection effect and improve the projection quality, the first surface 511 can be designed as a spherical surface or a free-form surface.

[0088] Similarly, in the solution of this application, the materials and shapes of the first lens 510 and the second lens 520 are not limited. For example, the materials of the first lens 510 and the second lens 520 can be selected as plastic, glass, etc. At the same time, the shapes of the first lens 510 and the second lens 520 can be circular, as shown in (b) of Figure 5 or rectangular, as shown in (c) of Figure 5 . Specifically, reference can be made to the relevant descriptions of the first lens 310 and the second lens 320 in the above Figure 3 , which will not be elaborated here.

[0089] In addition, similar to the glued Fresnel prism 220 shown in Figure 3 , optionally, an anti-reflection layer is added on the first surface 511 and / or the fourth surface 522. Or, optionally, a light absorption layer is provided on the trapezoidal lower surface of the fourth surface 522 by means of inking, screen printing, film pasting, coating, etc. Or, optionally, an extinction structure member as shown in Figure 4 is added on the first surface 511 and / or the fourth surface 522 to block light and absorb stray light. Specifically, reference can be made to the relevant descriptions in the above Figure 3 , which will not be elaborated here.

[0090] Exemplarily, in combination with Figure 5 (a) in Figure 5 and (c) in

[0091] Table 3 shows the relevant optical data of a double-glued Fresnel prism with a rectangular aperture provided in the embodiments of the present application.

[0092]

[0093] It can be understood that the values in Table 3 above are only examples provided in the embodiments of the present application, and do not constitute a limitation on the glued Fresnel prism 220 protected by the present application. That is, under the solution of the present application, more double-glued Fresnel prisms can be designed according to requirements, and are not limited to those shown in Table 3 above.

[0094] Figure 6 FIG. 18 is a schematic diagram of the third glued Fresnel prism 220 provided in the embodiments of the present application. As Figure 6 shown, Figure 6 (a) in Figure 2 is a side view of the glued Fresnel prism 220. Specifically, the glued Fresnel prism 220 is a triple-glued Fresnel prism, which is composed of a first lens 610, a second lens 620, and a third lens 630. The first lens 610 includes a first surface 611 and a second surface 612. The second lens 620 includes a third surface 621 and a fourth surface 622. The third lens 630 includes a fifth surface 631 and a sixth surface 632. Among them, the second surface 612 of the first lens 610 coincides with the surface shape of the third surface 621 of the second lens 620, and they are pasted together by gluing to form a first glued surface. The fourth surface 622 of the second lens 620 coincides with the surface shape of the fifth surface 631 of the third lens 630, and they are pasted together by gluing to form a second glued surface. The first surface 611 and the sixth surface 632 are respectively the first outer surface and the second outer surface of the glued Fresnel prism 220. Different from Figure 6 the first glued Fresnel prism 220 shown in

[0095] It can be understood that in Figure 6In the glued Fresnel prism 220 shown, the second surface 612, the third surface 621, the fourth surface 622, the fifth surface 631, and the sixth surface 632 are serrated surfaces. The inclination angle of this serrated surface is also determined based on the first included angle. That is, based on the deflection angle of the glued Fresnel prism 220 for the chief ray (i.e., the first included angle) required by the system, and the materials of the first lens 610, the second lens 620, and the third lens 630, reverse design and optimization are carried out through optical software or optical formulas, scripts, etc. according to the achromatic principle.

[0096] Similarly, the serrated surface profiles of the second surface 612, the third surface 621, the fourth surface 622, the fifth surface 631, and the sixth surface 632 can be inclined planes or free-form surfaces.

[0097] It can be understood that in order to make the second surface 612 and the third surface 621 fully engage, the serration pitches of the second surface 612 and the third surface 621 are the same. In order to make the fourth surface 622 and the fifth surface 631 fully engage, the serration pitches of the fourth surface 622 and the fifth surface 631 are the same.

[0098] Optionally, the first surface 611 is a plane, a serrated surface, a spherical surface, or a free-form surface, which is not limited in this application. When the first surface 611 is a serrated surface, the inclination angle of this serrated surface can be determined according to the deflection angle of the glued Fresnel prism 220 for the chief ray, the materials of the first lens 610, the second lens 620, and the third lens 630, and the achromatic aberration requirements of the projection module 200 for the glued Fresnel prism 220. The inclination angle of the inclined surface of the first surface 611 is one of [0°, 80°]. Similarly, in order to achieve a clearer projection effect and improve the projection quality, the first surface 611 can be designed as a spherical surface or a free-form surface.

[0099] Similarly, in the solution of this application, the materials and shapes of the first lens 610, the second lens 620, and the third lens 630 are not limited. For example, the materials of the first lens 610, the second lens 620, and the third lens 630 can be selected as plastics, glasses, etc. It can be understood that in order to achieve the achromatic aberration effect, the materials of the first lens 610, the second lens 620, and the third lens 630 are set differently.

[0100] At the same time, the shapes of the first lens 610, the second lens 620, and the third lens 630 can be circular, as shown in (b) of Figure 6 or rectangular, as shown in (c) of Figure 6 . Specifically, reference can be made to the relevant descriptions of the first lens 310 and the second lens 320 in the above Figure 3 , which will not be elaborated here.

[0101] In addition, compared with Figure 3Similarly, optionally, an anti-reflection layer is added to the first surface 611 and / or the sixth surface 632 of the glued Fresnel prism 220 shown. Alternatively, optionally, a light absorption layer is provided in the vertical projection areas of the sawtooth sharp corners and bottom corners of the sixth surface 632 by means such as inking, silk screening, film laminating, coating, etc. Alternatively, optionally, an extinction structure member as shown in Figure 4 is added to the first surface 611 and / or the sixth surface 632 to block light and absorb stray light. Specifically, reference can be made to the description of the relevant part in the above Figure 3 , and details are not described herein again.

[0102] Exemplarily, in combination with Figure 6 (a) in and Figure 6 (c) in, Table 4 shows the relevant optical data of a triple-glued Fresnel prism with a rectangular aperture provided by an embodiment of the present application.

[0103] Table 4

[0104]

[0105] It can be understood that the values in Table 4 above are only examples provided by the embodiments of the present application and do not constitute a limitation to the glued Fresnel prism 220 protected by the present application. That is, under the solution of the present application, more double-glued Fresnel prisms can be designed according to requirements, and are not limited to those shown in Table 4 above.

[0106] Figure 7 FIG. is a schematic structural diagram of an image generation unit 210 applicable to an embodiment of the present application. As Figure 7 shown, the image generation unit 210 includes a light source 710, a modulation unit 720, and a projection module 730. Among them, the light source 710 is used to provide a light beam carrying image data. The modulation unit 720 is used to modulate the light beam emitted by the light source according to the image data, so that the light output from the modulation unit 720 carries the image data, that is, the light output from the modulation unit 720 is imaging light (or called image light). The projection module 730 is used to project the imaging light carrying the image data. It should be noted that Figure 7 is only one of the structures of an image generation unit 210 applicable to an embodiment of the present application, that is, the image generation unit 210 applicable to an embodiment of the present application is not limited to Figure 7 shown. In some other embodiments, the image generation unit 210 applicable to an embodiment of the present application may further include a collimation module, a light homogenization module, etc.

[0107] Optionally, the image generation unit 210 may adopt a liquid crystal display (LCD) monitor, a liquid crystal on silicon (LCOS) monitor, an organic light-emitting diode (OLED) monitor, a Micro-LED monitor, a monitor adopting a display technology using miniLEDs, a digital light procession (DLP) monitor, a micro-electro-mechanical systems (MEMS) monitor, etc., which are not limited in this application.

[0108] Figure 8 FIG. 4 is a schematic optical path structure diagram of a second projection module 800 provided by an embodiment of the present application. It can be understood that the projection module 800 may be applied to a vehicle as shown in Figure 1 as an example of the projection module 150. As shown in Figure 8 FIG. 4, the projection module 800 includes an image generation unit 810, a glued Fresnel prism 820, and a transmission unit 830. Among them, the transmission unit 830 is connected to the glued Fresnel prism 820, and the transmission unit 830 is used to move the glued Fresnel prism 820 to make the projection module 800 in a first state or a second state. In the first state, the included angle between the second light beam emitted by the projection module 800 and the horizontal direction is a first included angle, and in the second state, the included angle between the first light beam emitted by the projection module 800 and the horizontal direction is a second included angle, and the first included angle is greater than the second included angle.

[0109] It should be noted that in the solution of the present application, the first state is the near-distance projection state of the projection module 800. Exemplarily, when the projection module is applied to the pixelated headlight of a vehicle, the first state may be the projection state of the projection module 800 in a near-field projection scenario, such as a welcome projection scenario. The second state is the far-distance projection state or the lighting state of the projection module 800. Exemplarily, when the projection module is applied to the pixelated headlight of a vehicle, the second state may be the lighting state of the projection module 800 in the auxiliary low beam or auxiliary high beam. Or, it may also be the projection state in a far-distance large-format movie viewing scenario.

[0110] Specifically, when the projection module 800 is applied to the first state, the transmission unit 830 is used to move the glued Fresnel prism 820 in front of the image generation unit 810. At this time, the image generation unit 810 is used to emit a first light beam to the glued Fresnel prism 820. The glued Fresnel prism 820 is used to deflect the transmission direction of the first light beam from the image generation unit 810 and emit a second light beam. It can be understood that when the projection module 800 is applied to the near-field projection scenario, both the first light beam and the second light beam are image lights carrying image information, and the second light beam is used to generate the first image of the projection module 800 in the first state. When the projection module 800 is applied to the second state, the transmission unit 830 moves the position of the glued Fresnel prism 820 so that the first light beam emitted by the image generation unit 810 cannot be projected onto the glued Fresnel prism 820. At this time, the light beam emitted by the projection module 800 is the first light beam emitted by the image generation unit 810. It can be understood that when the projection module 800 is applied to the far-field projection scenario, the first light beam is an image light carrying image information and is used to generate the second image of the projection module 800 in the second state. When the projection module 800 is applied to the lighting scenario, the first light beam does not carry image information and is used for lighting the projection module 800 in the second state.

[0111] According to the above description, when the projection module 800 is applied to the first state, the light beam emitted by the image generation unit 810 will pass through the glued Fresnel prism 820. When the projection module 800 is applied to the second state, the light beam emitted by the image generation unit 810 will not pass through the glued Fresnel prism 820 but will be directly emitted. Since the first included angle between the second light beam emitted by the projection module 800 in the first state and the horizontal direction is greater than the second included angle between the first light beam emitted by the projection module 800 in the second state and the horizontal direction. Therefore, the projection position of the second light beam emitted by the projection module 800 in the first state is closer to the image generation unit 810 than the projection position of the first light beam emitted by the projection module 800 in the second state. In other words, the projection position of the first light beam passing through the glued Fresnel prism 820 is closer to the image generation unit 810 than the projection position without passing through the glued Fresnel prism 820. Exemplarily, Figure 9 is a schematic diagram of the working modes of the projection module 800 in the first state and the second state in the embodiment of the present application. As Figure 9 shown, the projection position of the projection module 800 in the first state is projection position 1, and the projection position of the projection module 800 in the second state is projection position 2. When viewed from the perspective of the driver, projection position 1 is closer to the driver than projection position 2.

[0112] It should be noted that when the projection module 800 switches between the first state and the second state, the transmission unit 830 moves the glued Fresnel prism 820. It can move the glued Fresnel prism 820 left and right or up and down relative to the optical axis direction, and this application does not make any limitations. At the same time, the way the transmission unit 830 moves the glued Fresnel prism 820 can be at least one of translation and rotation, and this application does not make any limitations. In addition, it should also be noted that when the projection module 800 is applied in the first state, the transmission unit 830 moves the glued Fresnel prism 820 in front of the image generation unit 810. At this time, the glued Fresnel prism 820 can be perpendicular to the optical axis of the projection module or rotated relative to the optical axis, and neither will affect the deflection of the first light beam, and the position of the projected first image remains substantially unchanged. In other words, the projection module 800 provided in this application has a high tolerance for assembly tolerances, making the assembly of the projection module provided in this application simple and easy to operate.

[0113] Optionally, in the solution of this application, the transmission unit 830 moves the glued Fresnel prism 820 based on the state information of the projection module 800.

[0114] In some embodiments, the state information may be a pressure signal. Exemplarily, the user presses a button to control the transmission unit 830. When the transmission unit 830 receives the pressure signal, it moves the glued Fresnel prism 820 in front of the image generation unit 810, so that the first light beam transmits through the glued Fresnel prism 820. When the transmission unit 830 does not receive the pressure signal, for example, when the button for controlling the transmission unit 830 is popped up by the user's operation, or the button for controlling the transmission unit 830 is in the default factory popped-up state, the transmission unit 830 moves the glued Fresnel prism 820 out of the front of the image generation unit 810, so that the first light beam will not transmit through the glued Fresnel prism 820.

[0115] In some other embodiments, the state information may be an electrical signal. Exemplarily, the user selects different states of the projection module 800 through the state selection function on the display device connected to the projection module 800. At this time, different states correspond to different electrical signals. For example, the first state corresponds to the first electrical signal, and the second state corresponds to the second electrical signal. When the transmission unit 830 receives the first electrical signal, it moves the glued Fresnel prism 820 in front of the image generation unit 810, so that the first light beam transmits through the glued Fresnel prism 820. When the transmission unit 830 receives the second signal, the transmission unit 830 moves the glued Fresnel prism 820 out of the front of the image generation unit 810, so that the first light beam will not transmit through the glued Fresnel prism 820.

[0116] In some other embodiments, the status information may be a radio signal, such as a Bluetooth signal. Exemplarily, the user operates a control device connected to the projection module 800, such as a mobile phone, a remote control, etc., to select different states of the projection module 800. At this time, different states correspond to different Bluetooth signals. For example, the first state corresponds to the first Bluetooth signal, and the second state corresponds to the second Bluetooth signal. When the transmission unit 830 receives the first Bluetooth signal, it moves the glued Fresnel prism 820 in front of the image generation unit 810, so that the first light beam transmits through the glued Fresnel prism 820. When the transmission unit 830 receives the second Bluetooth signal, the transmission unit 830 moves the glued Fresnel prism 820 out of the front of the image generation unit 810, so that the first light beam does not transmit through the glued Fresnel prism 820.

[0117] It can be understood that the glued Fresnel prism 820 can be any one of the above Figure 3 , Figure 5 and Figure 6 types of glued Fresnel prisms, or an example of other glued Fresnel prisms not shown in the present application. Specifically, reference can be made to the relevant descriptions in the above Figure 3 , Figure 5 and Figure 6 , and details will not be repeated here.

[0118] Taking the lighting reminder system as the vehicle lamp as an example, the embodiments of the present application further provide a vehicle lamp. Figure 10 It is a functional schematic diagram of a vehicle lamp in the embodiments of the present application. As Figure 10 shown, the vehicle lamp 20 includes a controller 21, a driving module 22, and a lighting module 23. The projection module in the above embodiments can be specifically applied to the lighting module 23. Since a vehicle generally has two front headlights on the left and right, the lighting module 23 is divided into two parts on the left and right, and generally has corresponding driving modules 22 respectively. Of course, it is not excluded that the same driving module is used to drive the two lighting modules 23 at the same time. Usually, the controller 21 communicates with the computer system in the vehicle through a bus, is used to receive various information or control signals, and then sends information to the two driving modules 22 respectively to control the driving modules 22 to drive the corresponding lighting modules 23 to achieve the desired lighting effect. It should be noted that with the development of technology, the function of the controller 21 may be integrated into the computer system of the whole vehicle to be realized, and the computer system directly controls the driving module 22 to drive the corresponding lighting module 23, and the present application does not make any limitations. In addition, the vehicle lamp 20 may also integrate some sensing modules. For example, any one of sensing modules such as lidar, millimeter wave radar, or infrared detection devices is integrated into the intelligent vehicle lamp to form a vehicle lamp with integrated sensing and lighting functions.

[0119] The controller 21 may include one or more processors and a memory. The memory is used to store code for parsing instructions from a computer system and code for controlling the driving module 22. The processor parses the instructions and controls the driving module 23 according to the above code. In practical applications, the memory may be inside or outside the controller 21, which is not limited in this application. Among them, the processor may be one or more field-programmable gate arrays (FPGA), application specific integrated circuits (ASIC), system on chips (SoC), central processor units (CPU), network processors (NP), digital signal processing circuits (DSP), micro controller units (MCU), programmable logic devices (PLD) or other integrated chips, or any combination of the above chips or processors, etc. The memory may include volatile memory, such as RAM; the memory may also include non-volatile memory, such as ROM, flash memory, mechanical hard disk HDD or solid state drive SSD; the memory may also include a combination of the above types of memory.

[0120] The driving module 22 is matched with the lighting module 23. For example, when the lighting module 23 adopts DLP technology, the driving module 22 is the driving chip of a Digital Micro-mirror Device (DMD); when the lighting module 23 adopts LCD technology, the driving module 22 is the driving chip of an LCD; when the lighting module 23 adopts LCOS, the driving module 22 is the driving chip of an LCOS; this application does not make a limitation in this regard.

[0121] The lighting module 23 can implement the ADB function by using technologies such as matrix LEDs, Micro-LEDs, DMDs, LCDs, LCOSs, and laser scanning, and can also project characters, traffic signs, and even videos, etc., to improve driving safety and user experience. It should be understood that Figure 10It is only a schematic diagram of the vehicle lamp and does not constitute a limitation; the vehicle lamp can be realized by the lighting module 23 while realizing projection and also realizing the functions of high beam and low beam, or it can also include a separate high beam and low beam module; among them, if a separate high beam and low beam module is included, the high beam and low beam module can be controlled by the controller 21 to turn on or off the high beam and low beam, or it can communicate with the computer system of the vehicle through the bus and be controlled by the computer system to turn on or off the high beam and low beam. This application does not make a limitation.

[0122] In several embodiments provided by this application, it should be understood that the above-described embodiments are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0123] As mentioned above, it is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A projection module, characterized in that: include: An image generating unit and a glued Fresnel prism, wherein the glued Fresnel prism comprises at least one glued surface, a first outer surface and a second outer surface, wherein the at least one glued surface and the second outer surface are sawtooth surfaces, wherein: The image generating unit is used to emit a first light beam to the glued Fresnel prism, The cemented Fresnel prism is used to emit a second light beam based on the first light beam, the angle between the second light beam and the horizontal direction is a first angle, and the sawtooth inclination angle of the sawtooth surface is determined based on the first angle.

2. The projection module according to claim 1, characterized in that: The first angle is greater than 6°.

3. The projection module according to claim 1 or 2, characterized in that: The sawtooth inclination angle of the sawtooth surface ranges from [0° to 80°].

4. The projection module according to claim 1 or 2, characterized in that: The sawtooth inclination angle of the sawtooth surface is determined based on the first angle, including: when the material of the glued Fresnel prism is determined, adjusting the sawtooth inclination angle of the sawtooth surface based on the first angle so that the chromatic aberration of the glued Fresnel prism meets a preset range.

5. The projection module according to claim 1 or 2, characterized in that: An angle between the first light beam and the horizontal direction is a second angle, and the first angle is greater than the second angle.

6. The projection module according to claim 1 or 2, characterized in that: The projection module also includes a transmission unit, which is connected to the glued Fresnel prism. The transmission unit is used to move the glued Fresnel prism to the front of the image generating unit so that the first light beam emitted by the image generating unit is projected onto the glued Fresnel prism, or to move the glued Fresnel prism so that the first light beam emitted by the image generating unit cannot be projected onto the glued Fresnel prism.

7. The projection module according to claim 1 or 2, characterized in that: An anti-reflection layer is disposed on the first outer surface and / or the second outer surface, and the anti-reflection layer is used to reduce reflection of stray light on the first outer surface and / or the second outer surface.

8. The projection module according to claim 1 or 2, characterized in that: An absorption layer is arranged on the sawtooth vertical surface of the second outer surface, and the absorption layer is used to absorb stray light.

9. The projection module according to claim 1 or 2, characterized in that: A matt structure is provided on the first outer surface and / or the second outer surface, and the matt structure is used to absorb stray light. Each shielding area of ​​the matt structure corresponds to a sawtooth tip angle and a bottom angle of the sawtooth surface.

10. The projection module according to claim 1 or 2, characterized in that: The first outer surface is a spherical surface, a free-form surface, or a plane.

11. The projection module according to claim 1 or 2, characterized in that: The glued Fresnel prism is a double glued Fresnel prism, and the double glued Fresnel prism comprises a first lens and a second lens, and the first lens and the second lens are formed by bonding trapezoidal prisms.

12. The projection module according to claim 1 or 2, characterized in that: The cemented Fresnel prism is a triple cemented Fresnel prism.

13. A vehicle lamp, characterized in that: It comprises a control system and a projection module as claimed in any one of claims 1 to 12, wherein the control system is connected to a transmission unit. The control system is used to input status information of the projection module to the transmission unit, where the status information is first status information or second status information, the first status information corresponds to the first status, and the second status information corresponds to the second status.

14. A means of transport, characterized in that: The vehicle comprises a body and a projection module as claimed in any one of claims 1 to 12, wherein the projection module is arranged on the body.

Images