Projection module, projection module control method, vehicle lamp, and vehicle

Abstract

The present application provides a projection module and a projection module control method, which can be applied to a vehicle lamp and a vehicle. The projection module provided by the present application has a small size and high imaging quality, and can achieve an ultra-short-throw welcome projection effect. The projection module comprises an image generation unit and a cemented Fresnel prism; the cemented Fresnel prism has at least one cementing surface, a first outer surface, and a second outer surface; and the at least one cementing surface and the second outer surface are sawtooth surfaces. The image generation unit is configured to emit a first light beam to the cemented Fresnel prism; the cemented Fresnel prism emits a second light beam on the basis of the first light beam; and the included angle between the second light beam and the horizontal direction is a first included angle. The sawtooth inclination angle of the sawtooth surfaces is determined on the basis of the first included angle.

Description

A projection module, a method for controlling the projection module, a vehicle lamp and a vehicle

[0001] The present application claims priority to the Chinese patent application No. 202410661411.9, filed on May 24, 2024, and entitled "A projection module, a method for controlling the projection module, a vehicle lamp and a vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of light display, and in particular to a projection module, a method for controlling the projection module, a vehicle lamp and a vehicle. BACKGROUND

[0003] In the era of intelligent driving, the emergence of intelligent vehicle lamps endows vehicle lamps with more personalized and scenario-based features, and consumers have more personalized demands for vehicle lamps. However, the traditional welcome light is realized by printing a film with a specific pattern, which has the disadvantages of single pattern style and small projection range. SUMMARY

[0004] The present application provides a projection module, a method for controlling the projection module, a vehicle lamp and a vehicle. The projection module provided by the present application has small volume and high imaging quality, and can realize ultra-near field projection effect.

[0005] In a first aspect, an embodiment of the present application provides a projection module, comprising: an image generation unit and a glued Fresnel prism, the glued Fresnel prism comprising 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 being sawtooth 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 second light beam having a first included angle with a horizontal direction, and a sawtooth angle of the sawtooth surface is determined based on the first included angle.

[0006] Based on the above scheme, the present application determines the tilt angle of the sawtooth surface of the glued Fresnel prism through the first included angle, so that the projection module can achieve the projection effect of the desired angle by using the designed glued Fresnel prism. Since the tilt angle of the sawtooth surface of the glued Fresnel prism is designed based on the first included angle, the projection distance of the projection module provided by the present application will not be affected by the spatial layout of the projection module. Therefore, the projection module has a flexible design of projection angle, and can achieve different projection angles according to the application scene of the projection module. When applied to the welcome scene, the projection module provided by the present application can achieve super-close-distance welcome projection, thereby improving the user experience. Since the glued Fresnel prism has a glued surface, compared with the scheme of multiple Fresnel prisms, the scheme of the present application makes the volume of the projection module smaller. At the same time, the glued surface can weaken the stray light and ghost image caused by the interface reflection, so as to improve the quality of the projection picture.

[0007] In combination with the first aspect, in some implementations of the first aspect, the first included angle is greater than 6°.

[0008] It should be noted that the projection module provided by the present application can design different glued Fresnel prisms according to the application scene, so as to meet different application requirements of the projection module. When the projection module provided by the present application is applied to a near-field welcome scene, the deflection angle of the outgoing light beam relative to the horizontal direction can be greater than 6°, so as to achieve super-close-field welcome projection. It can be understood that the projection module of the present application can also be applied to other scenes. When the first included angle is less than or equal to 6° in other scenes, such as a long-distance projection scene.

[0009] In combination with the first aspect, in some implementations of the first aspect, the sawtooth angle of the sawtooth surface ranges from 0° to 80°.

[0010] It should be noted that in the present application scheme, the sawtooth angle is the included angle between the sawtooth and the optical axis vertical surface.

[0011] In combination with the first aspect, in some implementations of the first aspect, the sawtooth 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 angle of the sawtooth surface based on the first included angle, so that the chromatic aberration of the glued Fresnel prism meets a preset range.

[0012] In combination with the first aspect, in some implementations of the first aspect, the sawtooth surface of the sawtooth surface is an inclined plane.

[0013] Designing the surface type of the sawtooth surface as an inclined plane can reduce the complexity of design and process.

[0014] In some implementations of the first aspect, the projection module further includes a transmission unit connected with the glued Fresnel lens, the transmission unit is configured to move the glued Fresnel lens to the front of the image generation unit so that the first light beam emitted by the image generation unit is projected to the glued Fresnel lens, or move the glued Fresnel lens so that the first light beam emitted by the image generation unit cannot be projected to the glued Fresnel lens.

[0015] According to the above scheme, the transmission unit is configured to move the glued Fresnel lens so that the projection module emits the second light beam or the first light beam with a different angle with the horizontal direction, so that the projection module provided by the present application can be applied to different scenarios.

[0016] In some implementations of the first aspect, the first light beam has a second angle with the horizontal direction, and the first angle is greater than the second angle.

[0017] In some implementations of the first aspect, an anti-reflection layer is arranged on the first outer surface and / or the second outer surface, and the anti-reflection layer is configured to reduce reflection of stray light on the first outer surface and / or the second outer surface.

[0018] In some implementations of the first aspect, an absorption layer is arranged on the sawtooth vertical surface of the second outer surface, and the absorption layer is configured to absorb stray light.

[0019] In some implementations of the first aspect, a light-absorbing structure is arranged on the first outer surface and / or the second outer surface, the light-absorbing structure is configured to absorb stray light, and each occlusion area of the light-absorbing structure corresponds to a sawtooth tip angle and a base angle of the sawtooth surface.

[0020] According to the above scheme, by arranging at least one of the anti-reflection layer, the absorption layer or the light-absorbing structure, the quality of the projected image can be improved, and the user experience can be improved.

[0021] In some implementations of the first aspect, the first outer surface is a spherical surface or a free-form surface or a planar surface.

[0022] 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 projected image. When the first surface is a planar surface, the processing difficulty and design difficulty can be reduced.

[0023] In some implementations of the first aspect, the glued Fresnel prism is a double-glued Fresnel prism, and the double-glued Fresnel prism includes a first lens and a second lens, and the first lens and the second lens are formed by a trapezoidal prism bonding.

[0024] The glued Fresnel prism formed by the trapezoidal prism bonding can reduce the processing difficulty and the process complexity.

[0025] In some implementations of the first aspect, the glued Fresnel prism is a triple-glued Fresnel prism.

[0026] Based on the above scheme, the triple-glued Fresnel prism can further eliminate the chromatic aberration of the projection module, thereby improving the projection quality of the projection module.

[0027] In the second aspect, an embodiment of the present application provides a method for controlling a projection module, the projection module including an image generation unit and a glued Fresnel prism, the glued Fresnel prism including 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 being sawtooth surfaces, the method including: in response to a control operation of the projection module by a user, the projection module working in a first state or a second state, wherein in the first state, the image generation unit emits a first light beam to the glued Fresnel prism, the glued Fresnel prism emits a second light beam based on the first light beam, an included angle between the second light beam and a horizontal direction being a first included angle, and a sawtooth inclination angle of the sawtooth surface being determined based on the first included angle; and in the second state, the first light beam emitted by the image generation unit cannot be projected to the glued Fresnel prism.

[0028] Based on the above scheme, the method for controlling the projection module provided by the present application can switch the projection module between the first state and the second state, wherein the first state can be, for example, a welcome projection state of an ultra-near field, and the second state can be a long-distance projection state or an illumination state. By designing the sawtooth inclination angle of the glued Fresnel prism based on the first included angle, the projection module can achieve a desired first included angle projection, thereby meeting the needs of different application scenarios.

[0029] In some implementations of the second aspect, the first included angle is greater than a second included angle between the first light beam and the horizontal direction.

[0030] With reference to the second aspect, in some implementations of the second aspect, the projection module further comprises a transmission unit, and the glued Fresnel prism is connected to the transmission unit. In response to the control operation of the user on the projection module, the transmission unit acquires state information generated by the control operation, the state information being first state information or second state information, the first state information corresponding to the first state, and the second state information corresponding to the second state. The transmission unit moves the glued Fresnel prism according to the state information, so that the state of the projection module is the first state or the second state.

[0031] In a third aspect, an embodiment of the present application provides a vehicle lamp. The vehicle lamp comprises a control system and the projection module provided by the first aspect and any one of the implementations of the first aspect. The control system is connected to the transmission unit. The control system is configured to input state information of the projection module to the transmission unit. The state information is first state information or second state information. The first state information corresponds to the first state. The second state information corresponds to the second state.

[0032] In a fourth aspect, an embodiment of the present application provides a vehicle. The vehicle comprises a body of the vehicle and the projection module provided by the first aspect and any one of the implementations of the first aspect. The projection module is arranged on the body. BRIEF DESCRIPTION OF DRAWINGS

[0033] FIG. 1 is a schematic structural block diagram of a vehicle 100 suitable for an embodiment of the present application.

[0034] FIG. 2 is a structural schematic diagram of a projection module 200 provided by an embodiment of the present application.

[0035] FIG. 3 is a schematic diagram of a first glued Fresnel prism 220 provided by an embodiment of the present application.

[0036] FIG. 4 is a schematic diagram of an extinction structure 400 provided by an embodiment of the present application.

[0037] FIG. 5 is a schematic diagram of a second glued Fresnel prism 220 provided by an embodiment of the present application.

[0038] FIG. 6 is a schematic diagram of a third glued Fresnel prism 220 provided by an embodiment of the present application.

[0039] FIG. 7 is a structural schematic diagram of an image generation unit 210 suitable for an embodiment of the present application.

[0040] FIG. 8 is a schematic optical path structural diagram of a second projection module 800 provided by an embodiment of the present application.

[0041] FIG. 9 is a schematic diagram of working modes of the projection module 800 in a first state and a second state according to an embodiment of the present application.

[0042] FIG. 10 is a schematic diagram of a method 1000 for controlling a projection module according to an embodiment of the present application.

[0043] FIG. 11 is a schematic diagram of a function of a vehicle lamp according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0045] In order to facilitate understanding of the embodiments of the present application, the following explanations are made.

[0046] First, in the textual explanations of the embodiments of the present application shown below or the terms in the accompanying drawings, "first", "second", and the like as well as various numerical numbers are only used for differentiation for the convenience of description, and are not intended 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.

[0047] Second, the term "comprise" and any variations thereof in the embodiments of the present application shown below are intended to cover the inclusion of not only the listed elements but also other elements not listed or inherent to the products or systems.

[0048] Third, in the embodiments of the present application, the words "exemplarily" or "for example" and the like are used to represent examples, illustrations or descriptions, and the embodiments or design solutions described as "exemplarily" or "for example" should not be interpreted as more preferred or more advantageous than other embodiments or design solutions. The words "exemplarily" or "for example" and the like are intended to present the relevant concepts in a specific manner for the convenience of understanding.

[0049] Fourth, in the accompanying drawings of the present application, the thickness, size and shape of each optical element have been slightly exaggerated for the convenience of illustration. Specifically, the shapes of the optical elements shown in the accompanying drawings are shown by way of example, and the accompanying drawings are only examples and are not drawn strictly according to the scale.

[0050] Fifth, unless otherwise defined, all the terms (including technical terms and scientific terms) used in the present application have the same meanings as commonly understood by those skilled in the art to which the present application belongs.

[0051] The pixelated large lamp has obvious advantages in the diversity of the welcome pattern and the projection range, and has the potential to become a new generation of intelligent welcome projection lamp. At present, the vertical field of view of the existing pixelated large lamp is about 7°, however, the front projection distance of the vehicle is usually greater than 8m, so the smaller vertical field of view is difficult to achieve good welcome effect. In order to shorten the distance of the welcome projection, the pixelated large lamp is usually inclined downward by a certain angle by using a motor. However, the adjustment range of this scheme is very limited, usually less than 6°, and at the same time it will also occupy the space in the lamp, resulting in a significant increase in the layout difficulty.

[0052] Therefore, the projection module provided in the present application can be applied to the pixelated projection large lamp, and the deflection of the wide spectrum light beam is realized by occupying a smaller volume, so as to meet the ultra-short field projection requirements of the pixelated large lamp, such as the welcome scene, and has excellent projection effect and projection quality.

[0053] Firstly, the vehicle to which the projection module provided in the present application can be applied will be described below, referring to Fig. 1, wherein Fig. 1 is a functional block diagram of one embodiment of the vehicle provided in the present application. In one embodiment, the vehicle 100 is configured in a fully or partially autonomous driving mode. For example, the vehicle 100 can control itself while in the autonomous driving mode, and can determine the current state of the vehicle and its surrounding environment, determine the possible behavior of at least one other vehicle in the surrounding environment, and determine the confidence level corresponding to the possibility of the other vehicle performing the possible behavior, control the vehicle 100 based on the determined information. When the vehicle 100 is in the autonomous driving mode, the vehicle 100 can be operated without human interaction. The vehicle 100 can include various systems, each of which can include multiple elements. In addition, each system and element of the vehicle 100 can be interconnected by wire or wirelessly.

[0054] The vehicle shown in this embodiment includes a sensor system 120, which can include several sensors that sense information about the environment surrounding the vehicle 100. For example, the sensor system 120 can include a positioning system 121 (which can be a global positioning system (GPS) system, a Beidou system, or other positioning system), an inertial measurement unit (IMU) 122, a radar 123, a laser rangefinder 124, and a camera 125. The sensor system 120 can also include sensors that monitor internal systems of the vehicle 100 (e.g., 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 respective characteristics (location, shape, direction, speed, etc.). Such detection and recognition are key functions for the safe operation of the autonomous vehicle 100. The positioning system 121 can be used to estimate the geographic 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 direction of travel of the objects. The specific type of radar 123 is not limited in this embodiment, for example, the radar 123 can be a millimeter wave radar or a laser radar, etc. The laser rangefinder 124 can use laser light to sense objects in the environment in which the vehicle 100 is located. In some embodiments, the laser rangefinder 124 can 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 still camera, a video camera, a monocular / dual-lens camera, or an infrared imager.

[0055] The vehicle 100 also includes an advanced driving assistance system (ADAS) 110. The ADAS 110 senses the surrounding environment at all times during vehicle driving, collects data, recognizes, detects, and tracks static and dynamic objects, and combines navigation map data to perform system operation and analysis, thereby allowing the driver to be aware of potential dangers in advance, effectively increasing the comfort and safety of vehicle driving. For example, the ADAS 110 can control the vehicle through data obtained by the sensor system 120. For another example, the ADAS 110 can control the vehicle through vehicle data, which can be 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.

[0056] The manner in which the ADAS 110 controls the vehicle can be one or more of the following: the ADAS 110 adjusts the heading of the vehicle 100. The ADAS 110 controls the operational speed of the vehicle's engine and, in turn, the speed of the vehicle 100. The ADAS 110 operates images captured by the camera 125 in order to identify objects and / or features in the vehicle's 100 environment. In some embodiments, the ADAS 110 can be used to map the environment, track objects, estimate the speed of objects, etc. The ADAS 110 determines a driving route for the vehicle 100, in some embodiments, the ADAS 110 can determine a driving route for the vehicle 100 in conjunction with one or more predetermined map data from the sensor system 120. The ADAS 110 can identify, evaluate, and avoid or otherwise navigate around potential obstacles in the vehicle's 100 environment.

[0057] The vehicle 100 interacts with external sensors, other vehicles, other computer systems, or users through the peripherals 130. The peripherals 130 can include a wireless communication system 131, an on-board computer 132, a microphone 133, and / or a speaker 134.

[0058] In some embodiments, the peripherals 130 provide a means for a user of the vehicle 100 to interact with a user interface. For example, the on-board computer 132 can provide information to a user of the vehicle 100. The user interface can also operate the on-board computer 132 to receive input from the user. The on-board computer 132 can be operated through a touch screen. In other cases, the peripherals 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 input) from a user of the vehicle 100. Similarly, the speaker 134 can output audio to a user of the vehicle 100.

[0059] The wireless communication system 131 can wirelessly communicate with one or more devices directly or via a communication network. For example, the wireless communication system 131 can use third generation (3G) cellular communication, such as code division multiple access (CDMA), global system for mobile communications (GSM), general packet radio service (GPRS) technology. The wireless communication system 131 can use fourth generation (4G) cellular communication, such as long term evolution (LTE). The wireless communication system 131 can also use fifth generation (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 infrared links, Bluetooth, or ZigBee. 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 communication between vehicles and / or roadside stations.

[0060] Some or all of the functionality of the vehicle 100 is controlled by a computer system 140. The computer system 140 can control the functionality of the vehicle 100 based on inputs received from various systems (e.g., the sensing system 120, the ADAS 110, the peripherals 130), as well as from a 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 a 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.

[0061] The processor 141 is not limited in type, for example, the processor 141 can 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 processors (DSP), micro controller units (MCU), programmable logic devices (PLD), or other integrated chips, or any combination of the above chips or processors, etc. The processor 141 can be located inside the vehicle, or the processor 141 can be located away from the vehicle and wirelessly communicate with the vehicle.

[0062] In some embodiments, the memory 142 can include instructions (e.g., program logic) that can be executed by the processor 141 to perform various functions of the vehicle 100. In addition to instructions, the memory 142 can also store data, such as map data, route information, the vehicle's position, orientation, speed, and other vehicle data. The information stored by the memory 142 can be used by the vehicle 100 and the computer system 140 during operation of the vehicle 100 in autonomous, semi-autonomous, and / or manual modes.

[0063] The vehicle 100 shown in the embodiments also includes a projection module 150, which can be a pixelated car light module, for example. The projection module 150 has the advantages of small volume and high projection quality in the present application. It can not only meet the needs of super-near-field welcoming, but also meet the needs of lighting 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 in combination with various embodiments.

[0064] It should be noted that the projection module 150 shown in the embodiments can not only be applied to vehicles, but also be applied to driving tools such as ships, airplanes, and helicopters.

[0065] The present application relates to a glued Fresnel prism. The various Fresnel prisms provided in the present application can be applied not only to pixelated headlamps, but also to cameras, projectors, microscopes, telescopes, and lithography machines related to optical imaging and optical projection. In addition, they can be applied to any system using the principle of refraction, including acoustic systems, acousto-optic systems, etc. The present application is not limited.

[0066] FIG. 2 is a structural schematic diagram of a 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 the vehicle as shown in FIG. 1, as an example of the projection module 150. As shown in FIG. 2, the projection module 200 includes an image generation unit 210 and a cemented 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 cemented Fresnel prism. The cemented Fresnel prism 220 is configured to emit a second light beam based on the first light beam, and the second light beam has a first included angle with a horizontal direction. The cemented Fresnel prism 220 includes at least one cemented surface, a first outer surface and a second outer surface, the at least one cemented surface and the second outer surface are sawtooth surfaces, and the sawtooth angle of the sawtooth surfaces is determined based on the first included angle.

[0067] It should be noted that the sawtooth angle is the included angle between the sawtooth and the vertical plane of the optical axis. In the present application, the range of the sawtooth angle of the sawtooth surface is [0°, 80°], that is, the sawtooth angle of the cemented surface is one of [0°, 80°], the sawtooth angle of the second outer surface is selected as one of [0°, 80°], and the sawtooth angle of the cemented surface and the sawtooth angle of the second outer surface can be the same or different.

[0068] In the projection module 200 of the present application, the cemented Fresnel prism 220 is used. For the cemented Fresnel prism 220, it can fold the direction of the incident first light beam by a certain angle, and at the same time, the cemented Fresnel prism 220 can cement at least two prisms together to form an integrated optical system, so that the projection module 200 has a smaller volume, and the stray light and ghost image caused by the reflection of the interface are weakened through the cemented surface, so that the projection module has good optical performance. It should be noted that in the present application, the first light beam emitted by the image generation unit 210 can enter the cemented Fresnel prism 220 through the first outer surface, at this time, the second light beam is emitted from the second outer surface of the cemented Fresnel prism 220, or the first light beam emitted by the image generation unit 210 can enter the cemented Fresnel prism 220 through the second outer surface, at this time, the second light beam is emitted from the first outer surface of the cemented Fresnel prism 220, which is not limited in the present application.

[0069] In the scheme of the present application, the glued Fresnel prism 220 comprises a sawtooth surface, and the sawtooth angle of the sawtooth surface is related to the first included angle of the second light beam emitted by the glued Fresnel prism 220. That is, in the scheme of the present application, the sawtooth angle of the glued Fresnel prism 220 can be determined by the first included angle, so as to realize 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 by the present application can design the sawtooth 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 scene, so as to realize the projection scene at different first included angles. It can be understood that in the scheme of the present application, when the first included angle is greater than 6°, the projection effect of the super-near field can be realized, and when the projection module 200 is applied to a pixel headlamp, the super-near field welcome projection effect can be realized, and the user experience is improved.

[0070] Next, the specific structures of the three kinds of glued Fresnel prisms 220 provided by the embodiments of the present application will be described in detail in combination with FIGS. 3-6.

[0071] FIG. 3 is a schematic diagram of a first glued Fresnel prism 220 provided by an embodiment of the present application. As shown in FIG. 3, (a) in FIG. 3 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 comprises a first surface 311 and a second surface 312. The second lens 320 comprises a third surface 321 and a fourth surface 322. Among them, the second surface 312 of the first lens 310 and the third surface 321 of the second lens 320 are coincident in shape, and are pasted together by gluing to form a glued surface. The first surface 311 and the fourth surface 322 are the first outer surface and the second outer surface of the glued Fresnel prism 220, respectively.

[0072] Specifically, in the glued Fresnel prism 220 shown in FIG. 3, the second surface 312, the third surface 321 and the fourth surface 322 are sawtooth surfaces. According to the above description of FIG. 2, the sawtooth angles of the second surface 312, the third surface 321 and the fourth surface 322 are determined based on the first included angle. Specifically, the deflection angle of the chief ray (i.e. the first included angle) required by the system is determined, and after the materials of the first lens 310 and the second lens 320 of the glued Fresnel prism 220 are selected, the reverse design of the sawtooth angle is realized according to the achromatic principle, that is, the incident light of different wavelengths passes through the glued Fresnel prism 220 and exits at the same position with the same first included angle. It can be understood that the optical design and optimization process of the sawtooth angle can be carried out through optical software or optical formula, script, etc.

[0073] The present application does not limit the surface type of the sawtooth, i.e., the sawtooth of the second surface 312, the third surface 321 and the fourth surface 322 can be an inclined plane or a free-form surface. In order to simplify the processing difficulty and design difficulty, the surface type of the sawtooth is usually selected as an inclined plane.

[0074] It can be understood that, since the surface type of the second surface 312 coincides with that of the third surface 321, in order to make the second surface 312 and the third surface 321 fully meshed, the sawtooth pitch of the second surface 312 and the third surface 321 is the same in the present application. It can be understood that the sawtooth pitch of the second surface 312 and the third surface 321 is related to the processing technology of the material of the first lens 310 and the second lens 320. For example, when the material of the first lens 310 or the second lens 320 is plastic, the sawtooth pitch can be selected as 4mm 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 2mm according to the cold processing technology. It should be noted that the present application does not limit the sawtooth pitch of the third surface 321 and the fourth surface 322, which can be the same or different.

[0075] Alternatively, the first surface 311 is a plane, a sawtooth surface, a spherical surface or a free-form surface. When the first surface 311 is a sawtooth surface, the present application does not limit the sawtooth pitch of the first surface 311 and the second surface 312, i.e., the sawtooth pitch of the first surface 311 can be the same as or different from that of the second surface 312. It can be understood that when the first surface 311 is a sawtooth surface, the surface type of the sawtooth of the first surface 311 can be an inclined plane or a free-form surface, which is not limited by the present application. Similarly, the sawtooth angle of the first surface 311 can be determined according to the deflection angle of the main light ray of the cemented Fresnel prism 220, the material of the first lens 310 and the second lens 320, and the achromatic requirement of the projection module 200 to the cemented Fresnel prism 220. The sawtooth angle of the sawtooth 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 generating unit 210, thereby realizing the effect of clear near-field imaging.

[0076] It should be noted that the scheme of 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 plastic, glass, crystal, and any combination thereof. Among them, the plastic lens can be polymethyl methacrylate (PMMA), polycarbonate (PC), etc., which is processed by precision machining, injection molding, nano-imprinting, etc. The glass lens can be common optical glass H-K9L material, H-ZF1 material, etc., which is processed by cold machining, precision machining, high-temperature molding, nano-imprinting, etc. It can be understood that in order to achieve the effect of achromatic, the materials of the first lens 310 and the second lens 320 are set to be different.

[0077] It should also be noted that the scheme of the present application does not limit the shape of the first lens 310 and the second lens 320. Optionally, the shape of the first lens 310 and the second lens 320 is circular, rectangular, or any other required shape. For example, (b) in FIG. 3 and (c) in FIG. 3 are front views of the glued Fresnel prism 220. Among them, the aperture shape of the glued Fresnel prism 220 corresponding to (b) in FIG. 3 is circular, and the aperture shape of the glued Fresnel prism 220 corresponding to (c) in FIG. 3 is rectangular.

[0078] In order to reduce the stray light caused by reflection of the light passing surface of the glued Fresnel prism 220, in some embodiments, an anti-reflection layer can be added at the air interface of the glued Fresnel prism 220. That is, an anti-reflection layer is added to the first surface 311 and / or the fourth surface 322. For example, the anti-reflection layer can be an anti-reflection film.

[0079] Optionally, in order to reduce the strong reflection of the sawtooth vertical surface of the fourth surface 322 under grazing incidence, a light-absorbing layer can be provided on the sawtooth vertical surface of the fourth surface 322. It can be understood that when the first surface 311 is a sawtooth surface, a light-absorbing layer can also be provided on the sawtooth vertical surface of the first surface 311.

[0080] In addition, in order to reduce the reflection of the sawtooth vertical surface of the fourth surface 322 under grazing incidence, and the stray light at the sawtooth tip angle and the base angle, in some embodiments, a light absorbing layer can be added to the vertical projection area of the sawtooth tip angle and the base angle of the fourth surface 322, including but not limited to ink coating, silk printing, film pasting, film plating and the like. Alternatively, in other embodiments, light absorbing structures can be added to the fourth surface 322 to block light, i.e. absorb stray light. Among them, the light absorbing structure absorbs stray light through a horizontal blocking area that covers the sawtooth tip angle and the base angle, i.e. the sawtooth tip angle and the base angle of each sawtooth correspond one-to-one to the horizontal blocking area of the light absorbing structure. At the same time, the width of the horizontal blocking area can be designed according to the sawtooth tip angle and the base angle of each sawtooth to block stray light from entering the sawtooth, thereby avoiding the appearance of stray light or ghost image. Optionally, the light absorbing structure can be placed close to 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. For example, FIG. 4 is a schematic diagram of a light absorbing structure 400 provided in an embodiment of the present application. As shown in (a) of FIG. 4, the shape of the light absorbing structure 400 is similar to that of a "ladder", wherein the "beam" of the "ladder" is used to cover the tip angle and the base angle area of the glued Fresnel prism 220, and corresponds one-to-one to the sawtooth tip angle and the base angle of the glued Fresnel prism 220. When (a) of FIG. 4 is set on the glued Fresnel prism 220 shown in FIG. 3, the glued Fresnel prism 220 containing the light absorbing structure 400 is shown in (b) of FIG. 4.

[0081] For example, in combination with (a) of FIG. 3 and (b) of FIG. 3, Table 1 shows the related optical data of a double glued Fresnel prism with a circular aperture provided in an embodiment of the present application.

[0082] Table 1

[0083] In combination with (a) of FIG. 3 and (c) of FIG. 3, Table 2 shows the related optical data of a double glued Fresnel prism with a rectangular aperture provided in an embodiment of the present application.

[0084] Table 2

[0085] It can be understood that the values in the above Table 1 and Table 2 are only examples provided in the embodiments of the present application, and do not limit the glued Fresnel prism 220 protected by the present application. That is, under the scheme of the present application, more double glued Fresnel prisms can be designed according to the needs, and are not limited to the above Table 1 or Table 2.

[0086] FIG. 5 is a schematic diagram of a second glued Fresnel lens 220 according to an embodiment of the present application. As shown in FIG. 5, (a) of FIG. 5 is a side view of the glued Fresnel lens 220. Specifically, the glued Fresnel lens 220 is a double glued Fresnel lens, 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. The second surface 512 of the first lens 510 and the third surface 521 of the second lens 520 coincide in shape and are pasted together by gluing to form a glued surface. The first surface 511 and the fourth surface 522 are respectively a first outer surface and a second outer surface of the glued Fresnel lens 220.

[0087] Different from the first glued Fresnel lens 220 shown in FIG. 3, in the second glued Fresnel lens 220 shown in FIG. 5, the first lens 510 and the second lens 520 are both trapezoidal prisms. It can be understood that the trapezoidal prisms are easier to process than the overall Fresnel lens, and therefore, the use of trapezoidal prisms to make the Fresnel lens can achieve the effect of simplifying the process.

[0088] It can be understood that in the glued Fresnel lens 220 shown in FIG. 5, the second surface 512, the third surface 521 and the fourth surface 522 are inclined surfaces of the trapezoidal prisms. The inclination angle of the inclined surface is also determined based on the first included angle. That is, based on the deflection angle of the main light ray (i.e., the first included angle) required by the system for the glued Fresnel lens 220, and the materials of the first lens 510 and the second lens 520, the reverse design and optimization are performed according to the achromatic principle through optical software or optical formulas, scripts, etc.

[0089] Similarly, the inclined surface of the second surface 512, the third surface 521 and the fourth surface 522 can be an inclined plane or a free-form surface.

[0090] It can be understood that in order to make the second surface 512 coincide completely with the third surface 521, the height of each trapezoidal prism is equal.

[0091] Optionally, the first surface 511 is a plane, an inclined surface, a spherical surface or a free-form surface, which is not limited in the present application. When the first surface 511 is an inclined surface, the inclination angle of the inclined surface can be determined according to the deflection angle of the main light ray of the glued Fresnel lens 220, the materials of the first lens 510 and the second lens 520, and the achromatic requirement of the projection module 200 for the glued Fresnel lens 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.

[0092] Similarly, in the scheme of the present 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 from plastic, glass, etc. Meanwhile, the shapes of the first lens 510 and the second lens 520 can be circular, as shown in (b) of FIG. 5, or rectangular, as shown in (c) of FIG. 5. Specifically, reference can be made to the above description of the first lens 310 and the second lens 320 in FIG. 3, which will not be repeated here.

[0093] In addition, similar to the glued Fresnel 220 shown in FIG. 3, an anti-reflection layer can be optionally added to the first surface 511 and / or the fourth surface 522. Alternatively, a light-absorbing layer can be optionally provided on the trapezoidal lower surface of the fourth surface 522 by means of ink coating, silk printing, film pasting, film plating, etc. Alternatively, light-blocking and stray light-absorbing extinction structures such as those shown in FIG. 4 can be optionally added to the first surface 511 and / or the fourth surface 522. Specifically, reference can be made to the above description of the related parts in FIG. 3, which will not be repeated here.

[0094] By way of example, in combination with (a) of FIG. 5 and (c) of FIG. 5, Table 3 shows the related optical data of a double-glued Fresnel prism with a rectangular aperture according to an embodiment of the present application.

[0095] Table 3

[0096] It can be understood that the values in the above Table 3 are only examples provided by the embodiments of the present application and do not limit the glued Fresnel prism 220 protected by the present application. That is, under the scheme of the present application, more double-glued Fresnel prisms can be designed according to requirements and are not limited to those shown in the above Table 3.

[0097] FIG. 6 is a schematic diagram of a third glued Fresnel lens 220 according to an embodiment of the present application. As shown in FIG. 6, (a) of FIG. 6 is a side view of the glued Fresnel lens 220. Specifically, the glued Fresnel lens 220 is a three-glued Fresnel lens, 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. The second surface 612 of the first lens 610 and the third surface 621 of the second lens 620 are coincident in shape and are glued together to form a first glued surface. The fourth surface 622 of the second lens 620 and the fifth surface 631 of the third lens 630 are coincident in shape and are glued together to form a second glued surface. The first surface 611 and the sixth surface 632 are the first outer surface and the second outer surface of the glued Fresnel lens 220, respectively. Different from the first glued Fresnel lens 220 shown in FIG. 2, the glued Fresnel lens 220 shown in FIG. 6 is formed by gluing three Fresnel lenses, which can further reduce the dispersion of the system and improve the imaging quality of the system.

[0098] It can be understood that, in the glued Fresnel lens 220 shown in FIG. 6, the second surface 612, the third surface 621, the fourth surface 622, the fifth surface 631, and the sixth surface 632 are sawtooth surfaces. The inclination angle of the sawtooth surface is also determined based on the first included angle. That is, based on the deflection angle of the chief ray (i.e., the first included angle) of the glued Fresnel lens 220 required by the system and the materials of the first lens 610, the second lens 620, and the third lens 630, the sawtooth surfaces of the second surface 612, the third surface 621, the fourth surface 622, the fifth surface 631, and the sixth surface 632 are designed and optimized in reverse according to the achromatic principle by using optical software or optical formulas, scripts, etc.

[0099] Similarly, the sawtooth surfaces 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.

[0100] It can be understood that, in order to completely mesh the second surface 612 and the third surface 621, the sawtooth pitch of the second surface 612 and the third surface 621 is the same. In order to completely mesh the fourth surface 622 and the fifth surface 631, the sawtooth pitch of the fourth surface 622 and the fifth surface 631 is the same.

[0101] Optionally, the first surface 611 is a plane, a sawtooth surface, a spherical surface or a free-form surface, which is not limited in the present application. When the first surface 611 is a sawtooth surface, the inclination angle of the sawtooth surface can be determined according to the deflection angle of the main light ray by the glued Fresnel lens 220, the materials of the first lens 610, the second lens 620 and the third lens 630, and the achromatic requirement of the projection module 200 on the glued Fresnel lens 220. The inclination angle of the slope 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.

[0102] Similarly, in the present 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 from plastics, glass and the like. It can be understood that, in order to achieve the achromatic effect, the materials of the first lens 610, the second lens 620 and the third lens 630 are set to be different.

[0103] Meanwhile, the shapes of the first lens 610, the second lens 620 and the third lens 630 can be circular, as shown in (b) of FIG. 6, or rectangular, as shown in (c) of FIG. 6. Specifically, reference can be made to the above description of the first lens 310 and the second lens 320 in FIG. 3, which will not be repeated here.

[0104] In addition, similar to the glued Fresnel lens 220 shown in FIG. 3, optionally, an anti-reflection layer is added to the first surface 611 and / or the sixth surface 632. Alternatively, optionally, a light-absorbing layer is provided on the vertical projection area of the sawtooth tip angle and the base angle of the sixth surface 632 by means of ink coating, silk printing, film pasting, film plating and the like. Alternatively, optionally, a light-absorbing structure such as that shown in FIG. 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 above description of the related part in FIG. 3, which will not be repeated here.

[0105] Exemplarily, in combination with (a) of FIG. 6 and (c) of FIG. 6, Table 4 shows the related optical data of a three-glued Fresnel lens with a rectangular aperture according to an embodiment of the present application.

[0106] Table 4

[0107] It can be understood that the values in the above Table 4 are only examples provided by the embodiments of the present application, and do not limit the glued Fresnel lens 220 protected by the present application. That is, under the scheme of the present application, more double-glued Fresnel lenses can be designed according to the requirements, and are not limited to those shown in the above Table 4.

[0108] FIG. 7 is a structural schematic diagram of an image generation unit 210 applicable to the embodiments of the present application. As shown in FIG. 7, the image generation unit 210 includes a light source 710, a modulation unit 720, and a projection module 730. The light source 710 is configured to provide a light beam carrying image data. The modulation unit 720 is configured 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, i.e., the light output from the modulation unit 720 is imaging light (or image light). The projection module 730 is configured to project the imaging light carrying the image data. It should be noted that FIG. 7 is only one of the structures of the image generation unit 210 applicable to the embodiments of the present application, i.e., the image generation unit 210 applicable to the embodiments of the present application is not limited to that shown in FIG. 7. In other embodiments, the image generation unit 210 applicable to the embodiments of the present application can also include a collimation module, a light homogenization module, etc.

[0109] Optionally, the image generation unit 210 can adopt a liquid crystal display (LCD) display, a liquid crystal on silicon (LCOS) display, an organic light-emitting diode (OLED) display, a Micro-LED display, a display adopting a miniLED display technology, a digital light procession (DLP) display, or a micro-electro-mechanical systems (MEMS) display, etc., which is not limited in the present application.

[0110] FIG. 8 is a schematic light path structure diagram of a second projection module 800 provided by the embodiments of the present application. It can be understood that the projection module 800 can be applied to the vehicle as shown in FIG. 1 as an example of the projection module 150. As shown in FIG. 8, the projection module 800 includes an image generation unit 810, a glued Fresnel prism 820, and a transmission unit 830. The transmission unit 830 is connected with the glued Fresnel prism 820, and the transmission unit 830 is configured to move the glued Fresnel prism 820, so that the projection module 800 is in a first state or a second state. In the first state, the second light beam emitted by the projection module 800 has a first angle with the horizontal direction, and in the second state, the first light beam emitted by the projection module 800 has a second angle with the horizontal direction, the first angle being greater than the second angle.

[0111] It should be noted that in the scheme of the present application, the first state is the near distance projection state of the projection module 800. Illustratively, when the projection module is applied to the pixelated headlamp of a car, the first state can be the projection state of the projection module 800 applied to the near field projection scene, for example, the welcome projection scene. The second state is the far distance projection state or the illumination state of the projection module 800. Illustratively, when the projection module is applied to the pixelated headlamp of a car, the second state can be the illumination state of the projection module 800 applied to the auxiliary low beam or the auxiliary high beam. Or, it can also be the projection state in the far distance large-format viewing scene.

[0112] 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 to the front of the image generation unit 810, at this time, the image generation unit 810 is used to emit the first light beam to the glued Fresnel prism 820. The glued Fresnel prism 820 is used to fold the transmission direction of the first light beam from the image generation unit 810, and emit the second light beam. It can be understood that when the projection module 800 is applied to the near field projection scene, the first light beam and the second light beam are both image light 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 to 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 scene, the first light beam is 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 illumination scene, the first light beam does not carry image information, and is used to illuminate the projection module 800 in the second state.

[0113] According to the above description, when the projection module 800 is applied in the first state, the light beam emitted by the image generating unit 810 passes through the cemented Fresnel lens 820. When the projection module 800 is applied in the second state, the light beam emitted by the image generating unit 810 does not pass through the cemented Fresnel lens 820, but is 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, the projection position of the second light beam emitted by the projection module 800 in the first state is closer to the image generating 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 cemented Fresnel lens 820 is closer to the image generating unit 810 than the projection position of the first light beam not passing through the cemented Fresnel lens 820. Exemplarily, FIG. 9 is a schematic diagram of the working mode of the projection module 800 in the first state and the second state in the embodiment of the present application. As shown in FIG. 9, 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, the projection position 1 is closer to the driver than the projection position 2.

[0114] It should be noted that when the projection module 800 is switched between the first state and the second state, the transmission unit 830 moves the cemented Fresnel lens 820, which can be moving the cemented Fresnel lens 820 left and right relative to the optical axis direction, or moving the cemented Fresnel lens 820 up and down relative to the optical axis direction, which is not limited in the present application. Meanwhile, the transmission unit 830 can move the cemented Fresnel lens 820 in at least one of the translation and rotation, which is not limited in the present application. In addition, it should be noted that when the projection module 800 is applied in the first state, the transmission unit 830 moves the cemented Fresnel lens 820 to the front of the image generating unit 810. At this time, the cemented Fresnel lens 820 can be perpendicular to the optical axis of the projection module, or can be rotated relative to the optical axis, which will not affect the deflection of the first light beam, and the position of the projected first image remains substantially unchanged. In other words, the projection device 800 provided by the present application has high tolerance to assembly tolerances, so that the projection module provided by the present application is easy to assemble and operate.

[0115] Optionally, in the present application, the transmission unit 830 moves the Fresnel lens 820 based on the state information of the projection module 800.

[0116] In some embodiments, the state information can be a pressure signal, exemplarily, a user presses a button of the control transmission unit 830, when the transmission unit 830 receives the pressure signal, the Fresnel lens 820 is moved to the front of the image generation unit 810, so that the first light beam transmits the Fresnel lens 820. When the transmission unit 830 does not receive the pressure signal, for example, the user operates the button of the control transmission unit 830 to pop up, or the button of the control transmission unit 830 is in the default pop-up state out of the factory, the transmission unit 830 moves the Fresnel lens 820 out of the front of the image generation unit 810, so that the first light beam does not transmit the Fresnel lens 820.

[0117] In other embodiments, the state information can be an electrical signal, exemplarily, a user selects different states of the projection module 800 through a state selection function on a display device connected with 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, the second state corresponds to the second electrical signal, when the transmission unit 830 receives the first electrical signal, the Fresnel lens 820 is moved to the front of the image generation unit 810, so that the first light beam transmits the Fresnel lens 820. When the transmission unit 830 receives the second signal, the transmission unit 830 moves the Fresnel lens 820 out of the front of the image generation unit 810, so that the first light beam does not transmit the Fresnel lens 820.

[0118] In other embodiments, the state information can be a wireless electrical signal, such as a Bluetooth signal, exemplarily, a user selects different states of the projection module 800 by operating a control device connected with the projection module 800, such as a mobile phone, a remote control device, etc., at this time, different states correspond to different Bluetooth signals, for example, the first state corresponds to the first Bluetooth signal, the second state corresponds to the second Bluetooth signal, when the transmission unit 830 receives the first Bluetooth signal, the Fresnel lens 820 is moved to the front of the image generation unit 810, so that the first light beam transmits the Fresnel lens 820. When the transmission unit 830 receives the second Bluetooth signal, the transmission unit 830 moves the Fresnel lens 820 out of the front of the image generation unit 810, so that the first light beam does not transmit the Fresnel lens 820.

[0119] It can be understood that the glued Fresnel lens 820 can be any one of the glued Fresnel lenses in the above-mentioned FIG. 3, FIG. 5 and FIG. 6, or one of other glued Fresnel lenses not shown in the present application, specifically, reference can be made to the related description in the above-mentioned FIG. 3, FIG. 5 and FIG. 6, which will not be repeated here.

[0120] FIG. 10 is a schematic diagram of a method 1000 for controlling a projection module according to an embodiment of the present application. The method can be used to control the projection module 800 shown in FIG. 8, and can be executed by a controller, a control device, a control chip, etc. The present application does not limit the method. Specifically, the method includes the following steps.

[0121] S1001, in response to a user control operation on the projection module, the projection module works in a first state or a second state, wherein the projection module 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 sawtooth surfaces, in the first state, the image generation unit emits a first light beam to the glued Fresnel prism, the glued Fresnel prism emits 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, the sawtooth angle of the sawtooth surface is determined based on the first angle, in the second state, the first light beam emitted by the image generation unit cannot be projected to the glued Fresnel prism, the angle between the first light beam and the horizontal direction is a second angle, the first angle is greater than the second angle.

[0122] Specifically, when the method 100 is applied to the projection module 800 shown in FIG. 8, the user controls the projection module 800 to work in the first state or the second state through a control operation. The first state and the second state can be understood with reference to the related description of FIG. 8, which will not be repeated here. Meanwhile, the control operation of the user can include the button pressing, the display device touching, or the wireless control device controlling, etc. described in FIG. 8, which will not be repeated here.

[0123] Optionally, before S1001, the method 1000 further includes S1002.

[0124] S1002, obtaining state information, and moving the glued Fresnel prism according to the state information, wherein the state information is first state information or second state information, the first state information corresponds to the first state, and the second state information corresponds to the second state.

[0125] Specifically, before moving the glued Fresnel prism 820, the transmission unit 830 obtains state information and responds to the control operation of the user according to the state information. It can be understood that the state information has different forms according to the control operation of the user. For example, if the user operation is a button pressing operation, the state information is a pressure signal. If the user operation is a display device touching operation, the state information is an electrical signal. If the user operation is a wireless control device operation, the state information is a wireless signal. Specifically, the related description of FIG. 8 can be referred to, which will not be repeated here.

[0126] With the lighting prompt system as an example of a vehicle lamp, the embodiment of the present application further provides a vehicle lamp. FIG. 11 is a functional schematic diagram of a vehicle lamp according to an embodiment of the present application. As shown in FIG. 11, the vehicle lamp 20 includes a controller 21, a driving module 22, and a lighting module 23. The projection module in the above embodiment can be specifically applied in the lighting module 23. Since a vehicle generally has two front lamps on the left and right sides, the lighting module 23 is divided into two on the left and right sides, and generally has a corresponding driving module 22, of course, it is not excluded that the same driving module is used to drive two lighting modules 23 at the same time. Generally, the controller 21 communicates with the computer system in the vehicle through a bus, receives various information or control signals, and then sends information to the two driving modules 22 respectively, controls the driving module 22 to drive the corresponding lighting module 23, and achieves the desired lighting effect. It should be noted that with the development of technology, the function of the controller 21 can be integrated into the computer system of the whole vehicle to drive the corresponding lighting module 23 by directly controlling the driving module 22, which is not limited by the present application. In addition, the vehicle lamp 20 can also integrate some sensing modules, for example, any one of the sensing modules such as laser radar, millimeter wave radar or infrared detection device is integrated into the intelligent vehicle lamp to form a vehicle lamp with sensing and lighting integration.

[0127] The controller 21 can include one or more processors and memories. The memories are used to store codes for parsing instructions from the computer system and codes for controlling the driving module 22, and the processors parse the instructions and control the driving module 23 according to the codes. In actual applications, the memories can be inside or outside the controller 21, which is not limited in the present application. The processors can 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 processors (DSP), micro controller units (MCU), programmable logic devices (PLD) or other integrated chips, or any combination of the above chips or processors.

[0128] The driving module 22 is matched with the lighting module 23. For example, when the lighting module 23 adopts the DLP technology, the driving module 22 is a driving chip of a digital micro-mirror device (DMD); when the lighting module 23 adopts the LCD technology, the driving module 22 is a driving chip of an LCD; when the lighting module 23 adopts the LCOS, the driving module 22 is a driving chip of an LCOS, which is not limited in the present application.

[0129] The lighting module 23 can use matrix LED, Micro-LED, DMD, LCD, LCOS, and laser scanning technology to realize ADB function, and can project text, traffic signs, and even videos, etc., to improve driving safety and user experience. It should be understood that FIG. 11 is only a schematic diagram of the vehicle lamp and does not constitute a limitation; the vehicle lamp can realize high beam and low beam functions while realizing projection by the lighting module 23, or can include a separate high beam and low beam module; if the 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 can communicate with the computer system of the vehicle through the bus to be controlled by the computer system to turn on or off the high beam and low beam, which is not limited in the present application.

[0130] In several embodiments provided in the present application, it should be understood that the above-described embodiments are only illustrative, for example, the division of the modules is only a logical functional division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0131] The above describes only the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A projection module, characterized by, The projection module comprises an image generation unit and a cemented Fresnel lens, the cemented Fresnel lens comprises at least one cemented surface, a first outer surface and a second outer surface, the at least one cemented surface and the second outer surface are sawtooth surfaces, and wherein The image generation unit is configured to emit a first light beam towards the cemented Fresnel lens. The cemented Fresnel lens is configured to emit a second light beam based on the first light beam, an included angle between the second light beam and a horizontal direction is a first included angle, and a sawtooth inclination angle of the sawtooth surface is determined based on the first included angle. The first included angle is greater than 6°.

2. The projection module of claim 1, wherein, The sawtooth inclination angle of the sawtooth surface ranges from 0° to 80°.

3. 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 included angle, including: when a material of the cemented Fresnel lens is determined, adjusting the sawtooth inclination angle of the sawtooth surface based on the first included angle, so that a chromatic aberration of the cemented Fresnel lens satisfies a preset range.

4. The projection module according to any one of claims 1 to 3, characterized in that, The first included angle is greater than a second included angle between the first light beam and the horizontal direction.

5. The projection module according to any one of claims 1 to 4, characterized in that, The projection module further comprises a transmission unit connected with the cemented Fresnel lens.

6. The projection module according to any one of claims 1 to 5, wherein, The transmission unit is configured to move the cemented Fresnel lens to a front of the image generation unit, so that the first light beam emitted by the image generation unit is projected onto the cemented Fresnel lens, or to move the cemented Fresnel lens, so that the first light beam emitted by the image generation unit cannot be projected onto the cemented Fresnel lens. An anti-reflection layer is arranged on the first outer surface and / or the second outer surface, and the anti-reflection layer is configured to reduce reflection of stray light on the first outer surface and / or the second outer surface.

7. The projection module according to any one of claims 1 to 6, wherein, An absorption layer is arranged on a sawtooth normal plane of the second outer surface, and the absorption layer is configured to absorb stray light.

8. The projection module of any one of claims 1 to 7, wherein, An extinction structure is arranged on the first outer surface and / or the second outer surface, and the extinction structure is configured to absorb stray light, and each occlusion area of the extinction structure corresponds to a sawtooth vertex angle and a base angle of the sawtooth surface.

9. The projection module according to any one of claims 1 to 8, wherein, The first outer surface is a spherical surface, a free-form surface or a plane.

10. The projection module according to any one of claims 1 to 9, wherein, The cemented Fresnel lens is a double-cemented Fresnel lens, and the double-cemented Fresnel lens comprises a first lens and a second lens, and the first lens and the second lens are formed by bonding a trapezoidal prism.

11. The projection module according to any one of claims 1 to 10, wherein, The cemented Fresnel lens is a triple-cemented Fresnel lens.

12. The projection module according to any one of claims 1 to 10, wherein, The projection module comprises an image generation unit and a cemented Fresnel lens, the cemented Fresnel lens comprises at least one cemented surface, a first outer surface and a second outer surface, the at least one cemented surface and the second outer surface are sawtooth surfaces, and the method comprises:

13. A method of controlling a projection module, the method comprising: In response to a control operation of a user on the projection module, the projection module works in a first state or a second state, wherein In the first state, the image generation unit emits a first light beam towards the cemented Fresnel lens, the cemented Fresnel lens emits a second light beam based on the first light beam, an included angle between the second light beam and a horizontal direction is a first included angle, and a sawtooth inclination angle of the sawtooth surface is determined based on the first included angle; In the second state, the first light beam emitted by the image generation unit cannot be projected onto the cemented Fresnel lens. ​ 14. The method of claim 13, wherein, The first light beam and the horizontal direction form a second angle, and the first angle is greater than the second angle.

15. The method according to claim 13 or 14, characterized in that, The projection module further comprises a transmission unit, and the glued Fresnel prism is connected with the transmission unit, wherein the control operation of the projection module by the user comprises: The transmission unit acquires state information generated by the control operation, the state information being first state information or second state information, the first state information corresponding to the first state, and the second state information corresponding to the second state; The transmission unit moves the glued Fresnel prism according to the state information, so that the state of the projection module is the first state or the second state.

16. A vehicle light, characterized by The control system is connected with the transmission unit, The control system is configured to input state information of the projection module to the transmission unit, the state information being first state information or second state information, the first state information corresponding to the first state, and the second state information corresponding to the second state.

17. A vehicle, characterized by The projection module is arranged on the body of the vehicle.

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