Under-screen imaging optical system and brush palm device

Abstract

The utility model discloses an under-screen imaging optical system and a brush palm device, and the system comprises a display panel which is used for displaying an image; the transparent light guide plate is arranged above the display panel and is used for guiding ambient light to penetrate through; and the under-screen imaging module is arranged below the display panel and is used for generating an image. According to the utility model, the transparent light guide plate is arranged, so that a high-quality imaging effect is realized while a high display effect is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of under-screen imaging, and particularly to an under-screen imaging optical system and a palm-sweeping device. Background Art

[0002] Under-screen display technology is a technology that integrates a display under the screen to achieve a borderless full-screen experience.

[0003] The core of under-screen display technology lies in improving the utilization rate and aesthetics of the screen without sacrificing display effects and functions. To achieve this goal, multiple technical problems such as screen transmittance, pixel density, and imaging quality need to be solved. The following will introduce each aspect of under-screen display technology in detail:

[0004] Under-screen fingerprint recognition technology (Under Display, i.e., UD): This is one of the most common applications of under-screen technology. By embedding a fingerprint sensor under the screen, users can complete operations such as unlocking and payment by simply touching the screen. Currently, optical and ultrasonic are two mainstream under-screen fingerprint recognition technologies. The optical type recognizes by emitting light through the screen and reflecting the fingerprint image, while the ultrasonic type captures the fingerprint texture precisely by emitting sound waves through the screen. Ultrasonic technology has gradually become the mainstream due to its higher recognition accuracy and speed.

[0005] Under-screen camera technology (Camera Under Panel, i.e., CUP): The goal of this technology is to hide the front camera under the screen, making the "forehead" of the mobile phone completely disappear. Under-screen cameras need to solve the problem of difficult light transmission caused by high screen pixel density. By adjusting the screen pixel arrangement and material selection, the light transmittance can be improved. For example, using transparent oxide materials instead of traditional silicon materials can significantly enhance the light transmission efficiency. In addition, the application of AI image processing technology is also an important means to optimize the shooting effect. By real-time processing of the captured pictures, the image quality problems caused by insufficient light can be effectively improved.

[0006] Under-screen biometric recognition technology: In addition to fingerprint recognition, face recognition is also an important biometric recognition method. By embedding an infrared camera and a dot matrix projector under the screen, 3D modeling and face recognition can be achieved. Apple's Face ID is realized through this technology. With the continuous progress of technology, more innovative under-screen biometric recognition methods may emerge in the future, such as iris recognition and gesture recognition.

[0007] Under-screen environmental perception technology: Modern smartphones not only need to achieve display and photography functions, but also need to have environmental perception capabilities. For example, under-screen ambient light sensors, distance sensors, etc. can achieve automatic screen brightness adjustment and power-saving modes. These technologies are realized by embedding micro sensors under the screen, and have little impact on the screen display effect.

[0008] With the development of full-screen technology, users have higher requirements for the integrity and visual experience of the device screen. Under-screen imaging technology has become the key to achieving a full-screen design, but existing technologies still face challenges in imaging quality, screen display effect, and their coordinated operation.

[0009] The disclosure of the above background technical content is only used to assist in understanding the inventive concept and technical solution of the present utility model, and it does not necessarily belong to the prior art of this patent application. Without clear evidence indicating that the above content was publicly available on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and inventiveness of this application. Summary of the Utility Model

[0010] To this end, the present utility model realizes a high-quality imaging effect while maintaining a high display effect by setting a transparent light guide plate, which is applicable to mobile devices, computer monitors or other display devices, and can integrate an under-screen camera or other imaging devices without sacrificing the display effect.

[0011] In a first aspect, the present utility model provides an under-screen imaging optical system, which is characterized by comprising:

[0012] A display panel for displaying images;

[0013] A transparent light guide plate disposed above the display panel for guiding ambient light to pass through;

[0014] An under-screen imaging module disposed below the display panel for generating images.

[0015] Optionally, in the under-screen imaging optical system, the transparent light guide plate comprises:

[0016] A first microlens array for adjusting the angle of the transmitted light and reducing interference with the under-screen imaging module;

[0017] A grating structure for controlling the propagation path of light and improving imaging quality.

[0018] Optionally, in the under-screen imaging optical system, the grating structure is etched on the substrate of the first microlens array.

[0019] Optionally, in the described under-screen imaging optical system, the first microlens array and the grating structure are two independent structures, and the distance therebetween does not exceed 3 mm.

[0020] Optionally, in the described under-screen imaging optical system, the first microlens array includes:

[0021] A plurality of lens units for optically processing the passing light;

[0022] A substrate for fixing the lens units.

[0023] Optionally, in the described under-screen imaging optical system, the under-screen imaging module includes:

[0024] A camera sensor for capturing image information;

[0025] A second microlens array for focusing light and accurately projecting the image information onto the camera sensor;

[0026] An image processing circuit for processing and analyzing the image information captured by the camera sensor.

[0027] Optionally, in the described under-screen imaging optical system, the display panel includes:

[0028] A backlight module for providing a light source for the display panel;

[0029] A liquid crystal layer formed by sandwiching a liquid crystal material between two glass substrates.

[0030] Optionally, in the described under-screen imaging optical system, it further includes:

[0031] A polarizer including an upper polarizer and a lower polarizer, which converts the light of the backlight module into polarized light and controls the passing direction of the light to realize the display of an image.

[0032] Optionally, in the described under-screen imaging optical system, it further includes:

[0033] A cooperative control unit for controlling the working states of the display panel and the under-screen imaging module.

[0034] In a second aspect, the present utility model provides a palm-sweeping device, which is characterized by including the under-screen imaging optical system according to any one of the foregoing items.

[0035] Compared with the prior art, the present utility model has the following beneficial effects:

[0036] Through the design of the transparent light guide plate and the microlens array, the present utility model achieves high light transmittance and low reflectivity, improves the imaging quality, and realizes high-quality imaging effects while maintaining high display effects. Through the tight integration of the under-screen imaging module and the display screen unit, the present utility model realizes a full-screen design, which is conducive to obtaining better display effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes, and advantages of the present utility model will become more obvious:

[0038] Figure 1 It is a schematic structural diagram of an under-screen imaging optical system in an embodiment of the present utility model;

[0039] Figure 2 It is a schematic structural diagram of a transparent light guide plate in an embodiment of the present utility model;

[0040] Figure 3 It is a schematic structural diagram of a first microlens array in an embodiment of the present utility model;

[0041] Figure 4 It is a schematic structural diagram of an under-screen imaging module in an embodiment of the present utility model;

[0042] Figure 5 It is a schematic structural diagram of a display panel in an embodiment of the present utility model;

[0043] Figure 6 It is a schematic structural diagram of another display panel in an embodiment of the present utility model;

[0044] Figure 7 It is a schematic structural diagram of another under-screen imaging optical system in an embodiment of the present utility model.

[0045] 1 - Display panel;

[0046] 2 - Transparent light guide plate;

[0047] 3 - Under-screen imaging module;

[0048] 4 - First microlens array;

[0049] 5 - Grating structure;

[0050] 6 - Lens unit;

[0051] 7 - Base;

[0052] 8 - Camera sensor;

[0053] 9 - Second microlens array;

[0054] 10 - Image processing circuit;

[0055] 11 - Backlight module;

[0056] 12 - Liquid crystal layer;

[0057] 13 - Polarizer;

[0058] 14 - Cooperative control unit; Detailed implementation manners

[0059] The present utility model will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present utility model, but do not limit the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made. These all belong to the protection scope of the present utility model.

[0060] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and above - mentioned drawings of the present utility model are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present utility model described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any of their deformations are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0061] An in - screen imaging optical system provided by an embodiment of the present utility model aims to solve the problems existing in the prior art.

[0062] The technical solutions of the present utility model and how the technical solutions of the present application solve the above - mentioned technical problems will be described in detail below with specific embodiments. These several specific embodiments below can be combined with each other, and for the same or similar concepts or processes, they may not be repeated in some embodiments. The embodiments of the present utility model will be described below in conjunction with the drawings.

[0063] The present utility model realizes a high-quality imaging effect while maintaining a high display effect by providing a transparent light guide plate.

[0064] Figure 1 It is a schematic structural diagram of an under-screen imaging optical system in an embodiment of the present utility model. As Figure 1 shown, an under-screen imaging optical system in an embodiment of the present utility model includes:

[0065] A display panel 1, which is used for displaying images.

[0066] Specifically, as one of the core components of the system, the display panel is located at the center of the entire structure. It is responsible for displaying images for users to view and usually adopts advanced display technologies such as LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode Display). The display panel is fixed in the frame of the system to ensure stability and flatness, so as to guarantee the clarity and quality of the images. The display panel can be a transparent display screen or a traditional display screen.

[0067] A transparent light guide plate 2, which is arranged above the display panel and is used for guiding ambient light to pass through.

[0068] Specifically, the transparent light guide plate is arranged above the display panel, closely attached to the display panel but not in direct contact, so as to maintain a certain gap. Its main function is to guide ambient light to pass through, improve the brightness and clarity of the screen, and at the same time reduce the phenomena of reflection and glare. The transparent light guide plate is usually made of materials with high light transmittance, such as glass or transparent plastic. Without affecting the display effect, it maximally allows the external ambient light to pass through, thereby providing sufficient light sources for the under-screen imaging module.

[0069] An under-screen imaging module 3, which is arranged below the display panel and is used for generating images.

[0070] Specifically, the under-screen imaging module is arranged below the display panel, closely attached to the display panel but maintaining a certain isolation. It uses advanced imaging technologies such as microlens arrays and light field cameras to generate and capture images without affecting the normal operation of the display panel.

[0071] Figure 2 It is a schematic structural diagram of a transparent light guide plate in an embodiment of the present utility model. As Figure 2 shown, a transparent light guide plate in an embodiment of the present utility model includes:

[0072] A first microlens array 4, which is used for adjusting the angle of the transmitted light and reducing the interference to the under-screen imaging module.

[0073] Specifically, the first microlens array is designed and integrated on the surface or inside of the transparent light guide plate. These microlenses are arranged in an array (such as single-row type, M*N arrangement, full-coverage type, etc.). Each lens unit of the first microlens array has a micron-level light-transmitting aperture and relief depth, which can focus and transform light, thereby adjusting the angle and distribution of light. Parameters such as the arrangement pattern of the microlens array, lens shape, and focal length are carefully designed to ensure that the interference of light on the under-screen imaging module can be effectively reduced, the light distribution can be optimized, and the imaging effect can be improved.

[0074] The grating structure 5 is used to control the propagation path of light and improve the imaging quality.

[0075] Specifically, the grating structure is usually designed inside or on the surface of the transparent light guide plate and works in cooperation with the microlens array to further control the propagation path of light. The grating structure controls the propagation path of light through its special physical structure (such as periodically arranged lines or grooves), further optimizing the light distribution and imaging quality. The grating structure can be one-dimensional (such as a line grating) or two-dimensional (such as a surface grating), with a specific grating pitch and grating line direction. These parameters determine the optical performance and application range of the grating. The application of the grating structure effectively controls the propagation of light and reduces the interference of screen display on imaging.

[0076] In this embodiment, the first microlens array and the grating structure cooperate with each other through their respective unique optical characteristics to jointly optimize the propagation path and distribution of light, reduce the interference on the under-screen imaging module, and improve the imaging quality. This design enables the under-screen imaging optical system to achieve high-quality under-screen imaging functions while ensuring the display effect.

[0077] In some embodiments, the grating structure is etched on the substrate of the first microlens array. The grating structure does not exist as an independent layer but is directly formed on the substrate carrying the first microlens array through an etching process. At this time, the lines, grooves or other features of the grating structure share the same base material with the lens units of the microlens array. The etching process usually includes high-precision processing methods such as photolithography and electron beam lithography, which can precisely control the shape and size of the structure at the micron or nanometer scale. Therefore, the grating structure and the microlens array can be very precisely integrated together to ensure that their optical properties can be coordinated and optimized with each other. In this embodiment, since the grating structure and the microlens array share the same base, the optical interface between them is reduced, which helps to reduce losses such as reflection and scattering of light at the interface and improve the light transmittance and imaging quality; the integrated design of the grating structure and the microlens array enables them to act on light together to achieve more precise light control and optimization. The microlens array can adjust the angle and direction of light, while the grating structure can further control the propagation path and distribution of light, thereby improving the clarity and resolution of imaging; directly etching the grating structure on the substrate of the first microlens array can simplify the manufacturing process. Compared with manufacturing two independent components separately and then assembling them, this integrated design reduces the manufacturing steps and costs, while improving the stability and reliability of the product.

[0078] In some embodiments, the first microlens array and the grating structure are two independent structures, and the spacing therebetween does not exceed 3 mm. The first microlens array is mainly responsible for adjusting the angle and direction of the transmitted light to reduce interference with the under-screen imaging module and optimize the light distribution in the display area. Its design usually takes into account factors such as the shape, focal length, and arrangement of the lenses to achieve the best optical effect. The grating structure is mainly used to control the propagation path of light, and through its special physical structure (such as periodically arranged lines or grooves), it generates optical effects such as diffraction and interference to further improve the imaging quality. The design parameters of the grating structure (such as the grating pitch, line depth, angle, etc.) need to be precisely calculated and optimized according to specific application requirements. It allows for more refined and flexible light control within the transparent light guide plate and has broad application prospects in the under-screen imaging optical system.

[0079] Figure 3 This is a schematic structural diagram of a first microlens array in an embodiment of the present invention. As Figure 3 shown, a first microlens array in an embodiment of the present invention includes:

[0080] A plurality of lens units 6 for optically processing the transmitted light.

[0081] Specifically, the lens units are the core part of the first microlens array, and they are responsible for optically processing the light passing through. Each lens unit is a tiny optical element with a specific shape (such as spherical, aspherical, cylindrical, etc.) and optical properties (such as focal length, numerical aperture, etc.). When light passes through the lens unit, it will be subjected to optical effects such as refraction, reflection, or diffraction of the lens, thereby changing the propagation direction and focusing performance of the light. This optical processing helps to optimize the light distribution and imaging quality and reduce interference with the under-screen imaging module.

[0082] The lens units are arranged in an array on the first microlens array. They can be arranged according to a certain rule (such as a rectangular array, a hexagonal array, etc.) to ensure that the light can be processed evenly and effectively. The spacing and arrangement density between the lens units are also important factors to be considered in the design. Smaller spacing and higher arrangement density can provide better light control effects, but they will also increase the manufacturing difficulty and cost.

[0083] A substrate 7 for fixing the lens units.

[0084] Specifically, the substrate is a support structure for fixing the lens units. It is usually made of a transparent material with high light transmittance, high stability, and easy processing, such as glass, quartz, or polymer. The substrate not only provides stable support for the lens units but also ensures the accuracy of their relative positions and spacings. This is crucial for maintaining the overall optical performance of the first microlens array. The substrate material needs to have high light transmittance, high stability, and easy processability.

[0085] In this embodiment, the first microlens array realizes precise control and optimized processing of the passing light through the synergistic effect of its multiple lens units and the substrate structure. This design has wide application value in the under-screen imaging optical system, which can improve the imaging quality and reduce interference with the imaging module.

[0086] Figure 4 It is a schematic structural diagram of an under-screen imaging module in an embodiment of the present invention. As Figure 4 shown, an under-screen imaging module in an embodiment of the present invention includes:

[0087] A camera sensor 8 for capturing image information.

[0088] Specifically, the camera sensor is the core component of the under-display imaging module. It is responsible for capturing the image information in the light passing through the display screen. This light may come from the user's finger, face, or other external objects. After passing through the display screen, it is received by the camera sensor and converted into an electrical signal. The camera sensor has high sensitivity and can capture clear images in a relatively dark environment or through the display screen. The camera sensor has high resolution and can capture more detailed information, thereby improving the clarity and accuracy of imaging. The camera sensor has low noise and can reduce the noise in the image, improving the image quality.

[0089] The second microlens array 9 is used to focus light and project the image information accurately onto the camera sensor.

[0090] Specifically, the second microlens array is located in front of the camera sensor and is used to focus the light passing through the display screen. By adjusting the propagation path and focal point of the light, it projects the image information accurately onto the camera sensor, thereby improving the clarity and contrast of imaging. The second microlens array needs to have precise focusing performance to ensure that the light can be accurately projected onto the photosensitive area of the camera sensor. To capture a wider range of image information, the second microlens array needs to be designed as a wide-angle structure to cover a larger field of view.

[0091] The image processing circuit 10 is used to process and analyze the image information captured by the camera sensor.

[0092] Specifically, the image processing circuit is an important part of the under-display imaging module. It is responsible for processing and analyzing the image information captured by the camera sensor. This includes operations such as image enhancement, filtering, denoising, compression, and advanced processing such as feature extraction, recognition, and analysis of the image. The image processing circuit needs to have a high-performance processor and sufficient memory resources to support the rapid processing and analysis of a large amount of image data. To extend the battery life of the device, the image processing circuit needs to adopt a low-power design to reduce the consumption of battery power. To adapt to different application scenarios and requirements, the image processing circuit needs to have a certain degree of programmability so that users can adjust the image processing algorithms and parameters according to their needs. When there are two or more camera sensors, the image processing circuit controls the camera sensors to take pictures at separate times to prevent light source interference.

[0093] In summary, through the collaborative action of the camera sensor, the second microlens array, and the image processing circuit, this embodiment realizes the capture, focusing, and processing of images under the display screen, providing users with a more convenient and efficient imaging experience.

[0094] Figure 5This is a schematic structural diagram of a display panel in an embodiment of the present invention. As Figure 5 shown, a display panel in an embodiment of the present invention includes:

[0095] A backlight module 11, which is used to provide a light source for the display panel.

[0096] Specifically, the main function of the backlight module is to provide a uniform and sufficiently bright light source for the liquid crystal layer. Since liquid crystals themselves do not emit light, a backlight module is required to illuminate the liquid crystal layer so that the image can be seen by the user. The backlight module usually consists of components such as a light source, a light guide plate, a reflector, and optical films. The light source can be an LED (light-emitting diode), a CCFL (cold cathode fluorescent lamp), etc. Among them, LEDs have been widely used in modern display devices due to their advantages such as high efficiency, energy saving, and long lifespan. The light guide plate is responsible for evenly distributing the light emitted by the light source to the entire display area, and the reflector is used to reflect the unused light back to the light guide plate to improve the utilization rate of light. The optical films are used to adjust the direction of light, enhance brightness, improve contrast, etc. In this embodiment, the backlight module can be either transparent or opaque.

[0097] A liquid crystal layer 12, which is composed of two glass substrates sandwiching a liquid crystal material.

[0098] Specifically, the liquid crystal layer is responsible for controlling the passage of light according to the change of the electrical signal, thereby realizing the display of the image. Liquid crystal materials have special physical properties, that is, under the action of an electric field, the arrangement of their molecules will change, thereby changing the light transmittance or reflectance. The liquid crystal layer is usually composed of two glass substrates sandwiching a liquid crystal material. Transparent electrode materials (such as ITO, that is, indium tin oxide) are coated between these two glass substrates for applying an electric field. The liquid crystal material is encapsulated between the two glass substrates to form a closed cavity. When a voltage is applied to the electrodes, the liquid crystal molecules will change their arrangement, thereby changing the light transmittance or reflectance. By controlling the voltage on the electrodes in different regions, precise control of the light transmittance of the entire liquid crystal layer can be achieved, and thus the required image can be formed.

[0099] Figure 6 This is a schematic structural diagram of another display panel in an embodiment of the present invention. As Figure 6 shown, compared with the previous embodiment, another display panel in an embodiment of the present invention further includes:

[0100] A polarizer 13, including an upper polarizer and a lower polarizer, which converts the light of the backlight module into polarized light and controls the transmission direction of light to realize the display of the image.

[0101] Specifically, the upper polarizer is located on the upper surface of the liquid crystal layer, and the lower polarizer is located on the lower surface of the liquid crystal layer. The main function of the polarizer is to convert the natural light (unpolarized light) emitted by the backlight module into linearly polarized light and ensure that only light in a specific direction can pass through the liquid crystal layer. When the liquid crystal molecules in the liquid crystal layer change under the action of an electric field, they change the polarization direction of the passing light. The upper polarizer further selectively allows or blocks these changed lights from passing through, thereby controlling the light intensity and color of the light finally reaching the user's eyes and realizing the display of the image.

[0102] The polarizer is usually composed of multiple layers of thin films, including a PVA (polyvinyl alcohol) film, a TAC (triacetyl cellulose) film, a protective film, and a pressure-sensitive adhesive, etc. The PVA film is the core part of the polarizer, and it has polarization performance after stretching and dyeing treatment; the TAC film is used to improve the flexibility and weather resistance of the polarizer; the protective film is used to protect the surface of the polarizer from being scratched or polluted; the pressure-sensitive adhesive is used to paste the polarizer to the liquid crystal layer or other substrates.

[0103] In this embodiment, the polarization characteristics of the polarizer in the part above the under-screen imaging module are different from those in other regions. The part of the polarizer above the under-screen imaging module has a higher transmittance, so that more light can penetrate to the under-screen imaging module, improving the imaging quality. At the same time, the proportion of the light reflected from the backlight module to the under-screen imaging module can be reduced, and the influence of stray light on imaging can be reduced.

[0104] Figure 7 It is a schematic structural diagram of another under-screen imaging optical system in the embodiment of the present invention. As Figure 7 shown, compared with the previous embodiment, another under-screen imaging optical system in the embodiment of the present invention further includes:

[0105] A cooperative control unit 14, which is used to control the working states of the display panel and the under-screen imaging module.

[0106] Specifically, the cooperative control unit is responsible for coordinating and managing the working states between the display panel and the under-screen imaging module to ensure that the two can coexist harmoniously and optimize the overall performance. The cooperative control unit has the following main functions:

[0107] Status monitoring: The cooperative control unit first monitors the real-time working states of the display panel and the under-screen imaging module, including display parameters such as brightness, contrast, and color temperature, as well as imaging parameters such as the capture frame rate and exposure time of the camera.

[0108] Resource allocation: According to the current requirements and priorities of the system, the cooperative control unit reasonably allocates resources, such as power supply and processor performance, to ensure that both the display panel and the under-screen imaging module can obtain sufficient resources to work properly.

[0109] Signal synchronization: In order to ensure the accuracy of displayed images and imaging results, the collaborative control unit needs to synchronously process the signals from the display panel and the under-screen imaging module. This includes synchronization of video signals, synchronization of clock signals, etc.

[0110] Conflict resolution: In some cases, there may be working conflicts between the display panel and the under-screen imaging module, such as light interference, signal interference, etc. The collaborative control unit needs to be able to detect and resolve these conflicts to ensure stable operation of the system.

[0111] Intelligent Scheduling: The collaborative control unit can also intelligently schedule the working modes of the display panel and the under-screen imaging module according to the user's usage habits and system operating conditions. For example, when the user does not need to take photos or videos, the power consumption and performance of the under-screen imaging module can be reduced to save energy.

[0112] The application of collaborative control units optimizes the collaborative work of display and imaging and improves user experience.

[0113] The embodiment of the utility model also provides a palm-swiping device, including the under-screen imaging optical system described in any of the above items. The palm-swiping device of this embodiment cleverly combines optical imaging technology and biometric technology to achieve accurate capture and recognition of palm features, thereby safeguarding the safety and convenience of users. The palm-swiping device of this embodiment mainly works through its built-in under-screen imaging optical system. This system is located under the screen of the device or in a specific sensing area, does not take up additional space, and maintains the overall beauty and portability of the device. When the user places the palm in the specified position, the under-screen imaging optical system will start immediately to quickly and accurately image and identify the palm. The palm-swiping device in this embodiment has the characteristics of high-precision imaging, contactless operation, fast response, and high security. It is suitable for various application scenarios such as mobile payment, access control systems, and personal device unlocking.

[0114] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

[0115] The specific embodiments of the present utility model have been described above. It should be understood that the present utility model is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which do not affect the essence of the present utility model.

Claims

1. An under-screen imaging optical system, characterized in that: include: A display panel, used for displaying images; A transparent light guide plate, arranged above the display panel, for guiding ambient light to pass through; The under-screen imaging module is arranged below the display panel and is used to generate images.

2. The under-screen imaging optical system according to claim 1, characterized in that: The transparent light guide plate comprises: A first microlens array, used to adjust the angle of the transmitted light to reduce interference to the under-screen imaging module; The grating structure is used to control the propagation path of light and improve the imaging quality.

3. The under-screen imaging optical system according to claim 2, characterized in that: The grating structure is etched on the substrate of the first microlens array.

4. The under-screen imaging optical system according to claim 2, characterized in that: The first microlens array and the grating structure are two independent structures, and the distance between them does not exceed 3 mm.

5. The under-screen imaging optical system according to claim 2, characterized in that: The first microlens array comprises: A plurality of lens units for optically processing the light passing therethrough; A substrate is used to fix the lens unit.

6. The under-screen imaging optical system according to claim 1, characterized in that: The under-screen imaging module includes: A camera sensor for capturing image information; a second microlens array, for focusing light to accurately project image information onto the camera sensor; The image processing circuit is used to process and analyze the image information captured by the camera sensor.

7. The under-screen imaging optical system according to claim 1, characterized in that: The display panel comprises: A backlight module, used to provide light source for the display panel; The liquid crystal layer is composed of liquid crystal material sandwiched between two glass substrates.

8. The under-screen imaging optical system according to claim 7, characterized in that: Also includes: The polarizers, including an upper polarizer and a lower polarizer, convert the light of the backlight module into polarized light and control the transmission direction of the light to realize image display.

9. The under-screen imaging optical system according to claim 1, characterized in that: Also includes: A collaborative control unit is used to control the working status of the display panel and the under-screen imaging module.

10. A palm brushing device, characterized in that: A under-screen imaging optical system comprising any one of claims 1-9.

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