Integrated under-screen imaging optical system and brush palm equipment

Abstract

The utility model discloses an integrated under-screen imaging optical system and a brush palm device, and the system comprises a display screen unit which is used for displaying an image; the sensor integration layer is arranged below the display screen unit and comprises at least one sensor; and the transparent light guide plate is arranged between the display screen unit and the sensor integration layer and is used for guiding ambient light to penetrate through. According to the utility model, the transparent light guide plate and the sensor integration layer are arranged, so that integration and function realization of various sensors can be realized while the integrity of the display screen is maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of under-screen imaging, and specifically, to an integrated 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 need to be solved, such as screen transmittance, pixel density, imaging quality, etc. 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 under-screen technology applications. 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 method recognizes by the screen emitting light and reflecting the fingerprint image, while the ultrasonic method emits sound waves through the screen to accurately capture the fingerprint texture. 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 improve 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 appear in the future, such as iris recognition and gesture recognition.

[0007] Under-screen environmental sensing technology: Modern smartphones not only need to achieve display and photography functions, but also need to have environmental sensing 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 realizing the full-screen design, but there are still challenges in imaging quality, screen display effect, and their collaborative work in the existing technologies. At the same time, with the increasing demand for high screen-to-body ratio and multi-functional integration in mobile devices, the traditional sensor integration method can no longer meet the requirements of the full-screen design.

[0009] The disclosure of the above background technical content is only for assisting 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] Therefore, by providing a transparent light guide plate and a sensor integration layer, the present utility model can achieve the integration and function realization of multiple sensors while maintaining the integrity of the display screen.

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

[0012] A display screen unit for displaying images;

[0013] A sensor integration layer disposed under the display screen unit and including at least one sensor;

[0014] A transparent light guide plate disposed between the display screen unit and the sensor integration layer for guiding ambient light to pass through.

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

[0016] A microlens array for adjusting the angle of the transmitted light and reducing the interference with the sensor integration layer.

[0017] Optionally, in the integrated under-screen imaging optical system, the microlens array includes:

[0018] Multiple lens units for optically processing the transmitted light;

[0019] A base for fixing the lens unit.

[0020] Optionally, in the integrated under-screen imaging optical system, the transparent light guide plate includes:

[0021] A grating structure for controlling the propagation path of light and improving the imaging quality.

[0022] Optionally, in the integrated under-screen imaging optical system, the transparent light guide plate further includes:

[0023] A microlens array for adjusting the angle of the transmitted light and reducing the interference to the sensor integration layer;

[0024] The grating structure is etched on the substrate of the microlens array.

[0025] Optionally, in the integrated under-screen imaging optical system, the transparent light guide plate further includes:

[0026] A microlens array for adjusting the angle of the transmitted light and reducing the interference to the sensor integration layer;

[0027] The microlens array and the grating structure are two independent structures, and the distance therebetween does not exceed 3 mm.

[0028] Optionally, in the integrated under-screen imaging optical system, an isolation layer is provided between the sensor and the transparent light guide plate; the isolation layer is used to make the light pass unidirectionally to reduce the influence of light crosstalk.

[0029] Optionally, the integrated under-screen imaging optical system further includes:

[0030] A sensor signal processing unit connected to the sensor integration layer for receiving and processing the signals of the sensor.

[0031] Optionally, the sensor signal processing unit includes a signal amplifier, a filter, and an analog-to-digital converter.

[0032] In a second aspect, the present utility model provides a palm-sweeping device, which is characterized by including the integrated under-screen imaging optical system according to any one of the foregoing items.

[0033] Compared with the prior art, the present utility model has the following beneficial effects:

[0034] The present utility model integrates the sensor under the display screen, without occupying extra space, achieving a compact design of the device; in the present utility model, the transparent light guide plate ensures the display effect of the display screen and allows the sensor to work properly at the same time; the present utility model integrates multiple sensors, enhancing the functionality and user experience of the device. Description of the Drawings

[0035] 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 according to the provided drawings. By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, objectives and advantages of the present utility model will become more obvious:

[0036] Figure 1 Structural schematic diagram of an integrated under-display imaging optical system in an embodiment of the present utility model;

[0037] Figure 2 Structural schematic diagram of a transparent light guide plate in an embodiment of the present utility model;

[0038] Figure 3 Structural schematic diagram of a microlens array in an embodiment of the present utility model;

[0039] Figure 4 Structural schematic diagram of another transparent light guide plate in an embodiment of the present utility model;

[0040] Figure 5 Structural schematic diagram of another transparent light guide plate in an embodiment of the present utility model;

[0041] Figure 6 Structural schematic diagram of another transparent light guide plate in an embodiment of the present utility model;

[0042] Figure 7 Structural schematic diagram of another integrated under-display imaging optical system in an embodiment of the present utility model;

[0043] Figure 8 Structural schematic diagram of another integrated under-display imaging optical system in an embodiment of the present utility model;

[0044] Figure 9 Structural schematic diagram of a sensor signal processing unit in an embodiment of the present utility model.

[0045] 1 - Display screen unit;

[0046] 2 - Transparent light guide plate;

[0047] 3 - Sensor integration layer;

[0048] 4 - Microlens array;

[0049] 5 - Grating structure;

[0050] 6 - Lens unit;

[0051] 7 - Substrate;

[0052] 8 - Sensor;

[0053] 9 - Isolation layer;

[0054] 10 - Sensor signal processing unit; Detailed implementation manners

[0055] 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 modifications and improvements can still be made. These all belong to the protection scope of the present utility model.

[0056] 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 have to be used to describe a specific order or sequence. It should be understood that such data used 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 "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not have 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.

[0057] An integrated under-screen imaging optical system provided by an embodiment of the present utility model aims to solve the problems existing in the prior art.

[0058] The technical solution of the present utility model and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present utility model will be described below in conjunction with the drawings.

[0059] By providing a transparent light guide plate and a sensor integration layer, the present utility model can integrate multiple sensors and realize their functions while maintaining the integrity of the display screen.

[0060] Figure 1 It is a schematic structural diagram of an integrated under-display imaging optical system in an embodiment of the present utility model. As Figure 1 shown, an integrated under-display imaging optical system in an embodiment of the present utility model includes:

[0061] A display screen unit 1, which is used for displaying images.

[0062] Specifically, as one of the core components of the system, the display screen unit 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 screen unit 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 screen unit can be a transparent display screen or a traditional display screen.

[0063] A sensor integration layer 3, which is arranged under the display screen unit and includes at least one sensor 8.

[0064] Specifically, the sensor integration layer is arranged under the display screen unit, closely attached to the display screen unit 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 screen unit. The sensors in the sensor integration layer include but are not limited to fingerprint recognition sensors, proximity sensors, ambient light sensors, infrared sensors, visible light sensors, etc. The infrared sensor can be a structured light sensor, a TOF sensor, or an ordinary infrared sensor.

[0065] A transparent light guide plate 2, which is arranged between the display screen unit and the sensor integration layer and is used for guiding ambient light to pass through.

[0066] Specifically, the transparent light guide plate is closely attached to the sensor but does not directly contact it to maintain a certain gap. Its main function is to guide ambient light to pass through, so that more light is received by the sensor and the influence of stray light is reduced, thereby improving the imaging quality. The transparent light guide plate is usually made of materials with high light transmittance, such as glass or transparent plastic.

[0067] 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:

[0068] A microlens array 4 is used to adjust the angle of the transmitted light and reduce the interference to the sensor integration layer.

[0069] Specifically, the microlens array is designed and integrated on the surface or inside of the transparent light guide plate. These microlenses are arranged in an array form (such as single-row type, M*N arrangement, full distribution type, etc.). Each lens unit of the microlens array has a micron-level light-transmitting aperture and relief depth, and can focus and transform light, thereby adjusting the angle and distribution of light. Parameters such as the arrangement method, lens shape, focal length, etc. of the microlens array are carefully designed to ensure that the interference of light to the sensor integration layer can be effectively reduced, the distribution of light can be optimized, and the imaging effect can be improved.

[0070] Figure 3 It is a schematic structural diagram of a microlens array in an embodiment of the present invention. As Figure 3 shown, a microlens array in an embodiment of the present invention includes:

[0071] A plurality of lens units 6, which are used for optically processing the light passing through.

[0072] Specifically, the lens unit is the core part of the microlens array, and they are responsible for optically processing the light passing through. Each lens unit is a tiny optical element, having a specific shape (such as spherical surface, aspherical surface, cylindrical surface, etc.) and optical properties (such as focal length, numerical aperture, etc.). When light passes through the lens unit, they 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 the interference to the sensor integration layer.

[0073] The lens units are arranged on the microlens array in an array form. They can be arranged according to a certain rule (such as rectangular array, hexagonal array, etc.) to ensure that the light can be uniformly and effectively processed. 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 effect, but also increase the manufacturing difficulty and cost.

[0074] A substrate 7, which is used to fix the lens units.

[0075] 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, etc. 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 microlens array. The substrate material needs to have high light transmittance, high stability and easy processability.

[0076] In this embodiment, through the synergistic effect of its multiple lens units and the substrate structure, the microlens array achieves precise control and optimization of the light passing through. This design has wide application value in the imaging optical system under the integrated screen, which can improve the imaging quality and reduce the interference to the imaging module.

[0077] Figure 4 It is a schematic structural diagram of another transparent light guide plate in the embodiment of the present invention. As Figure 4 shown, another transparent light guide plate in the embodiment of the present invention includes:

[0078] A grating structure 5 for controlling the propagation path of light and improving the imaging quality.

[0079] Specifically, the grating structure is usually designed inside or on the surface of the transparent light guide plate to 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), optimizes the distribution of light and the 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 the screen display to imaging.

[0080] Figure 5 It is a schematic structural diagram of another transparent light guide plate in the embodiment of the present invention. As Figure 5As shown, another transparent light guide plate in the embodiment of the present utility model simultaneously includes a grating structure 5 and a microlens array 4. The grating structure is etched on the substrate of the microlens array. The grating structure does not exist as an independent layer, but is directly formed on the substrate carrying the 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 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.

[0081] Figure 6 is a schematic structural diagram of another transparent light guide plate in the embodiment of the present utility model. As Figure 6 shown, another transparent light guide plate in the embodiment of the present utility model simultaneously includes a grating structure 5 and a microlens array 4. The microlens array and the grating structure are two independent structures, and the distance therebetween does not exceed 3 mm. The microlens array is mainly responsible for adjusting the angle and direction of the transmitted light to reduce the interference to the sensor integration layer 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 generates optical effects such as diffraction and interference through its special physical structure (such as periodically arranged lines or grooves), thereby further improving the imaging quality. The design parameters of the grating structure (such as grating pitch, line depth, angle, etc.) need to be accurately 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 imaging optical system under the integrated screen.

[0082] Figure 7 is a schematic structural diagram of another imaging optical system under the integrated screen in the embodiment of the present utility model. As Figure 7As shown, an isolation layer 9 is provided between the sensor and the transparent light guide plate; the isolation layer is used to allow light to pass unidirectionally to reduce the influence of light crosstalk. The isolation layer has special optical properties, allowing light to pass through from one side of the transparent light guide plate to reach the sensor, while effectively preventing light from penetrating back from the sensor side to the transparent light guide plate or the display unit. This helps to keep the light received by the sensor pure and accurate, improving the imaging quality and sensing accuracy. The material of the isolation layer needs to have a high optical density and one-way perspective characteristics. For example, plastics containing specific additives or special coating technologies can be used to make the light pass only from one side, while the other side is almost opaque. Secondly, the thickness and refractive index of this layer also need to be accurately calculated to ensure the one-way transmission effect of light. In addition, the isolation layer also needs to have good mechanical stability and durability because physical impacts or pressure changes are inevitable during the use of the display device. This requires that the isolation layer material not only has good optical properties, but also has sufficient strength and elasticity to avoid deformation or damage caused by external forces. The light crosstalk phenomenon is one of the common problems in the under-screen imaging technology, which may lead to image blurring, color distortion or sensor misjudgment. The setting of the isolation layer effectively reduces the occurrence of this light crosstalk phenomenon, ensuring that the sensor can accurately capture the light information of the external environment. By reducing unnecessary light interference, the isolation layer also helps to improve the contrast in the area between the display screen and the sensor, enabling the sensor to more clearly distinguish the target object when capturing images or performing other sensing operations. The isolation layer and microstructure design in this embodiment reduce the influence of the display screen light emission on the sensor performance.

[0083] Figure 8 This is a schematic structural diagram of another integrated under-screen imaging optical system in the embodiment of the present invention. As Figure 8 shown, compared with the previous embodiment, another integrated under-screen imaging optical system in the embodiment of the present invention further includes:

[0084] A sensor signal processing unit 10, connected to the sensor integration layer, for receiving the signal of the sensor and processing it.

[0085] Specifically, the main functions of the sensor signal processing unit are to amplify, filter, convert, and correct the raw signals collected by the sensors to ensure the accuracy and reliability of the signals. First of all, the sensor signal processing unit needs to be able to receive the signals from each sensor in the sensor integration layer stably and accurately. These signals may include various types such as image data, light intensity information, touch position, etc. Since the signals output by the sensors are often relatively weak and may contain noise, the signal processing unit needs to amplify and filter these signals. Amplification can enhance the intensity of the signal, making it easier to be recognized and processed by the subsequent circuits; filtering can remove the useless components (such as high-frequency noise) in the signal and improve the signal-to-noise ratio. For the signals output by analog sensors, the signal processing unit also needs to perform analog-to-digital conversion to convert the continuous analog signals into discrete digital signals. This is because digital signals are more convenient for storage, transmission, and processing in computer systems. After obtaining the digital signals, the signal processing unit may also need to decode and correct the data. Decoding is the process of restoring the encoded information in the signal to the original data; correction is to adjust the data according to the known calibration parameters to eliminate the errors of the sensors themselves or the influence of environmental factors. Finally, the signal processing unit also needs to further process and analyze the decoded and corrected data. This may include various tasks such as image recognition, gesture recognition, calculation of ambient light intensity, etc. The processing results will be used as part of the system output to control the display content of the display screen, trigger other functions of the device, or interact with the user.

[0086] Figure 9 This is a schematic structural diagram of a sensor signal processing unit in an embodiment of the present invention. As Figure 9 shown, a sensor signal processing unit in an embodiment of the present invention includes: a signal amplifier, a filter, and an analog-to-digital converter.

[0087] Specifically, the main function of the signal amplifier is to increase the intensity of the signals output by the sensors, making it easier to be recognized and processed by the subsequent circuits. In the process of sensor signal processing, due to the sensitivity limitation of the sensors themselves or the attenuation during signal transmission, the raw signals may be very weak. Through the signal amplifier, the amplitude of the signals can be effectively enhanced to ensure the integrity and reliability of the signals. The filter is used to filter the sensor signals to remove the useless components (such as high-frequency noise, interference signals, etc.) in the signals and improve the signal-to-noise ratio and purity of the signals. In the imaging system under the integrated screen, the filter is particularly important for improving the image quality and enhancing the sensing accuracy. The analog-to-digital converter converts the analog signals output by the sensors into digital signals for storage, transmission, and processing in computer systems. In the imaging system under the integrated screen, the accuracy and speed of the ADC have an important impact on the image quality and system performance.

[0088] In this embodiment, the sensor signal processing unit realizes the reception, amplification, filtering, and digital processing of sensor signals through the collaborative work of a signal amplifier, a filter, and an analog-to-digital converter. This process not only improves the strength and purity of the signals but also makes the signals more suitable for subsequent digital signal processing and analysis. Finally, the processed signals are used to control the display content of the display screen, trigger other functions of the device, or interact with the user, thus realizing an efficient and intelligent under-screen imaging technology.

[0089] The embodiment of the present utility model also provides a palm-sweeping device, including the integrated under-screen imaging optical system described in any one of the foregoing items. The palm-sweeping device of this embodiment cleverly combines optical imaging technology and biometric recognition technology, realizing the precise capture and recognition of palm features, and escorting the safety and convenience of users. The palm-sweeping device of this embodiment mainly works through its built-in integrated under-screen imaging optical system. This system is located under the screen of the device or within a specific sensing area, without occupying extra space, and maintaining the overall beauty and portability of the device. When the user places the palm at the designated position, the integrated under-screen imaging optical system will be immediately activated to quickly and accurately image and recognize the palm. The palm-sweeping device in this embodiment features high-precision imaging, contactless operation, fast response, and high security. It is applicable to various application scenarios such as mobile payment, access control systems, and unlocking of personal devices.

[0090] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0091] 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 implementation manners. 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 integrated under-screen imaging optical system, characterized in that: include: A display unit, used for displaying images; A sensor integration layer, disposed below the display unit, comprising at least one sensor; A transparent light guide plate is arranged between the display screen unit and the sensor integration layer, and is used for guiding the ambient light to pass through.

2. The integrated under-screen imaging optical system according to claim 1, characterized in that: The transparent light guide plate comprises: The microlens array is used to adjust the angle of the transmitted light and reduce the interference to the sensor integration layer.

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

4. The integrated under-screen imaging optical system according to claim 1, characterized in that: The transparent light guide plate comprises: The grating structure is used to control the propagation path of light and improve the imaging quality.

5. The integrated under-screen imaging optical system according to claim 4, characterized in that: The transparent light guide plate further comprises: A microlens array, used to adjust the angle of the transmitted light and reduce interference with the sensor integration layer; The grating structure is etched on the substrate of the microlens array.

6. The integrated under-screen imaging optical system according to claim 4, characterized in that: The transparent light guide plate further comprises: A microlens array, used to adjust the angle of the transmitted light and reduce interference with the sensor integration layer; The microlens array and the grating structure are two independent structures, and the distance between them does not exceed 3 mm.

7. The integrated under-screen imaging optical system according to claim 1, characterized in that: An isolation layer is provided between the sensor and the transparent light guide plate; the isolation layer is used to allow light to pass in one direction to reduce the influence of cross-light.

8. The integrated under-screen imaging optical system according to claim 1, characterized in that: Also includes: The sensor signal processing unit is connected to the sensor integration layer and is used to receive and process the signal from the sensor.

9. The integrated under-screen imaging optical system according to claim 8, characterized in that: The sensor signal processing unit includes a signal amplifier, a filter and an analog-to-digital converter.

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

Images