Display panel and electronic device

Abstract

This application provides a display panel and an electronic device, relating to the field of biometric recognition technology. It can integrate an optical recognition module under a display panel without a polarization layer to realize the biometric information recognition function of the display panel without a polarization layer. Through the opening design on the display panel and the light channel design on the optical recognition module, the reception clarity of various parts of the optical sensor is balanced, thereby improving the recognition accuracy of biometric information and the overall imaging quality.

Description

[0001] This application claims priority to Chinese Patent Application No. 202220245867.3, filed on January 29, 2022, entitled "A Display Panel and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of biometric identification technology, specifically to a display panel and an electronic device. Background Technology

[0003] Organic light-emitting diode (OLED) displays are increasingly widely used in the display technology field due to their self-emissive nature, compact and thin structure, fast response speed, wide viewing angle, low power consumption, and ability to achieve flexible displays. An OLED display typically includes a substrate and a light-emitting module disposed on the substrate. The light-emitting module generally includes a second electrode layer, a first electrode layer, and a light-emitting layer disposed between the second and first electrode layers. A voltage is applied between the second and first electrode layers, generating positive and negative electrons. These electrons excite specific materials in the light-emitting layer to emit light of a corresponding color; therefore, OLED displays are also called electroluminescent displays.

[0004] Because OLED display panels contain metal layers within their light-emitting units, ambient light is easily reflected off these metal layers, severely impacting the display. Therefore, current technologies typically incorporate a polarization layer within the OLED panel to block ambient light. However, with advancements in OLED display technology, polarization-free OLED panels have emerged. By placing a black matrix on a filter layer above the light-emitting units, the black matrix blocks light beams outside the pixel units, resulting in near-zero screen transmittance for external light. This eliminates the need for a polarization layer and improves the thinness and lightness of the OLED display panel.

[0005] For OLED display panels without a polarization layer, since their screen transmittance is close to zero, light beams carrying biometric information can only pass through through specially designed openings to cooperate with optical recognition modules to achieve biometric identification or imaging functions. However, taking biometric imaging as an example, the openings on the display panel and the photosensitive pixel units of the optical recognition module are designed, manufactured, and assembled independently. Therefore, it is difficult to achieve a good match between the two. Once a mismatch occurs, it is very easy to cause uneven imaging quality in different parts of the biometric imaging process, resulting in poor imaging effects. Summary of the Invention

[0006] The purpose of this application is to provide a display panel and an electronic device that can integrate an optical recognition module under a display panel without a polarization layer to realize the biometric information recognition function of the display panel without a polarization layer. By using the opening design on the display panel and the light channel design on the optical recognition module, the reception clarity of each part of the photosensitive pixel unit is balanced, thereby improving the recognition accuracy of biometric information and the overall imaging quality.

[0007] In one aspect of this application, a display panel is provided, including a substrate, and a light-emitting structure, a light-filtering layer, and a cover plate sequentially disposed above the substrate. The light-filtering layer includes a plurality of light-filtering units, including red light-filtering units, green light-filtering units, and / or blue light-filtering units. The light-filtering layer also includes a black matrix located between the light-filtering units, wherein a light-transmitting hole is provided on the black matrix, and a light beam incident from one side of the cover plate can be emitted from the substrate through the light-transmitting hole; at least the biometric recognition area of ​​the display panel is divided into grids, and each grid contains at least one light-transmitting hole.

[0008] In one alternative embodiment of this application, each grid has the same shape and size.

[0009] In one optional embodiment of this application, the arrangement of the light-transmitting holes satisfies one or more of the following conditions: the light-transmitting holes are arranged in an array on the black matrix; the total area of ​​the light-transmitting holes contained in each grid is equal; and the number of light-transmitting holes contained in each grid is equal.

[0010] In one optional embodiment of this application, the spacing between two adjacent light-transmitting holes along the first direction is equal, and the spacing between two adjacent light-transmitting holes along the second direction is equal.

[0011] In one optional embodiment of this application, the cross-section of the light-transmitting hole is circular, and the diameter of the light-transmitting hole is between 5 μm and 15 μm.

[0012] In one optional embodiment of this application, the cross-section of the light-transmitting hole is any one of elliptical, polygonal, and irregular shapes, and the diameter of the circumscribed circle of the light-transmitting hole is between 5μm and 20μm.

[0013] In one optional embodiment of this application, the distance between two adjacent light-transmitting holes is less than or equal to 100 μm.

[0014] In one optional embodiment of this application, the light-emitting structure includes a first electrode layer, a light-emitting material layer, and a second electrode layer sequentially disposed above a substrate. The light-emitting material layer includes red light-emitting material units that are excited to emit red light, green light-emitting material units that are excited to emit green light, and / or blue light-emitting material units that are excited to emit blue light. The red light-emitting material units correspond to red filter units, the green light-emitting material units correspond to green filter units, and the blue light-emitting material units correspond to blue filter units. The light-emitting material layer also has pixel-defining material units disposed between each light-emitting material unit. A light-transmitting hole is disposed on the pixel-defining material unit corresponding to the light-transmitting hole, and a light beam incident from one side of the cover plate is emitted sequentially through the light-transmitting hole and the light-transmitting hole.

[0015] In one optional embodiment of this application, the first angle between the line connecting the center of the light-transmitting hole and the center of the corresponding light-transmitting hole and the vertical direction of the substrate is between 0° and 15°.

[0016] In one optional embodiment of this application, the light-emitting structure further includes a metal trace disposed below the first electrode layer, the metal trace being disposed outside the light path range formed by the light-transmitting hole and the light-passing hole.

[0017] Another aspect of this application provides an optical recognition module, including an optical path guiding layer and a plurality of photosensitive pixel units; a plurality of optical channels are formed on the optical path guiding layer, the optical path guiding layer includes at least two light-shielding layers spaced apart and a plurality of microlens units on the light-shielding layers, and apertures are formed on the light-shielding layers. The corresponding apertures and microlens units on the at least two light-shielding layers form the optical channels of the corresponding photosensitive pixel units, and the second angle between the line connecting the center of the microlens unit, the center of the aperture, and the center of the photosensitive pixel unit in the optical channel and the vertical direction of the substrate is between 0° and 15°.

[0018] In one optional embodiment of this application, the optical channel is cone-shaped with the photosensitive pixel unit as the apex, and the apex angle of the cone is less than or equal to 10°.

[0019] In one optional embodiment of this application, the spacing between two adjacent photosensitive pixel units is less than or equal to 80 μm.

[0020] In one optional embodiment of this application, an infrared filter layer is disposed between the microlens unit and the photosensitive pixel unit.

[0021] In another aspect of the embodiments of this application, an electronic device is provided, including a display panel and an optical recognition module under the display panel, wherein the display panel is any of the aforementioned display panels, and / or the optical recognition module is any of the aforementioned optical recognition modules.

[0022] In one optional embodiment of this application, a biometric identification area is provided on the display panel, and the light beam carrying biometric information passing through the biometric identification area is received by the photosensitive pixel unit of the optical identification module.

[0023] In one optional embodiment of this application, the spacing L between two adjacent light-transmitting holes along the first direction on the display panel satisfies: L≤M / N; Where M is the width of the object surface region corresponding to the optical recognition module along the first direction; N is the resolution of the imaging image acquired by the optical recognition module in the first direction; Alternatively, the spacing L between two adjacent light-transmitting holes along the first direction on the display panel satisfies: L≤A*M / H; Where A is the number of photosensitive pixel units corresponding to one image pixel in the first direction, and H is the number of photosensitive pixel units in the optical recognition module in the first direction.

[0024] In one optional embodiment of this application, in the optical recognition module, the line connecting the center of the microlens unit, the center of the aperture, and the center of the photosensitive pixel unit of the light channel coincides with the vertical direction of the substrate, and a light-transmitting hole corresponds to a light channel in the optical recognition module. Alternatively, the display panel also includes a light-passing hole on the pixel definition material unit corresponding to the light-transmitting hole, and a corresponding set of light-transmitting holes and light-passing holes, which correspond to a light channel in the optical recognition module.

[0025] In one optional embodiment of this application, in the optical recognition module, the line connecting the center of the microlens unit, the center of the aperture, and the center of the photosensitive pixel unit of the light channel has a second angle with the vertical direction of the substrate. The display panel also includes a light-transmitting hole on the pixel definition material unit corresponding to the light-transmitting hole. The angle difference between the second angle and the first angle between the line connecting the center of the corresponding light-transmitting hole and the center of the light-transmitting hole and the vertical direction of the substrate is within a preset threshold range. One light channel corresponds to at least one set of light-transmitting holes and light-transmitting holes.

[0026] In one optional embodiment of this application, the optical channel of the optical recognition module is cone-shaped with the photosensitive pixel unit as the apex. The bottom surface of the cone is projected onto the cover plate, and the light-transmitting hole is projected onto the cover plate. The projection of the bottom surface covers the projection of at least one light-transmitting hole. The ratio of the maximum total area to the minimum total area of ​​the projection of the light-transmitting hole covered by the projection of the bottom surface is less than or equal to 3.

[0027] In one optional embodiment of this application, the optical recognition module is divided into a pixel grid, and the light channel range corresponding to the photosensitive pixel unit in each pixel grid covers at least one light-transmitting hole in the display panel.

[0028] In one optional embodiment of this application, there is a gap between the upper surface of the microlens unit in the optical recognition module and the lower surface of the substrate in the display panel, and the gap is less than 1000 μm.

[0029] In one optional embodiment of this application, the spacing is between 20 μm and 600 μm.

[0030] The display panel provided in this application embodiment includes a substrate, and a light-emitting structure, a filter layer, and a cover plate sequentially disposed on the substrate. The filter layer also includes a black matrix located between the filter units, and a light-transmitting hole is disposed on the black matrix. In the display panel, at least the biometric recognition area is divided into grids, and each grid contains at least one light-transmitting hole. When the display panel of this application embodiment is used for under-display biometric information recognition, an optical recognition module is disposed under the display panel. The optical recognition module receives a light beam carrying biometric information through photosensitive pixel units. The light beam incident from one side of the cover plate can enter the photosensitive pixel units under the substrate through the light-transmitting hole. By arranging the light-transmitting holes on the black matrix in the display panel, the clarity of the light beam carrying biometric information is balanced for the photosensitive pixel units, thereby improving the accuracy of biometric information recognition and the overall quality of biometric information imaging. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the hierarchical structure of a display panel provided in an embodiment of this application; Figure 2 yes Figure 1 One of the top-view diagrams Figure 3 yes Figure 1 The second top-view diagram; Figure 4 This is one of the hierarchical structure diagrams of an electronic device provided in the embodiments of this application; Figure 5 This is a second schematic diagram of the hierarchical structure of an electronic device provided in an embodiment of this application; Figure 6 This is one of the hierarchical structure diagrams of an optical recognition module provided in the embodiments of this application; Figure 7This is a second schematic diagram of the hierarchical structure of an optical recognition module provided in an embodiment of this application; Figure 8 This is the third schematic diagram of the hierarchical structure of an optical recognition module provided in the embodiments of this application; Figure 9 This is the third schematic diagram of the hierarchical structure of an electronic device provided in the embodiments of this application.

[0033] Icons: 01-Optical recognition module; 0111-Photosensitive pixel unit; 02-Optical path guiding layer; 020-Optical channel; 021-First light-shielding layer; 0211-First aperture; 022-Second light-shielding layer; 0221-Second aperture; 0231-Microlens unit; 10-Substrate; 20-Light-emitting structure; 201-First electrode layer; 202-Light-emitting material layer; 2021-Red light-emitting material unit; 2022-Green light-emitting material unit; 2023-Blue light-emitting material unit; 2024-Pixel definition material unit; 203-Second electrode layer; 21-Light-transmitting hole; 30-Filter layer; 301-Red filter unit; 302-Green filter unit; 303-Blue filter Unit; 304 - Black matrix; 31 - Light-transmitting hole; 40 - Cover plate; α - First angle between the line connecting the center of the light-transmitting hole and the center of the light-transmitting hole and the vertical direction of the substrate; β - Second angle between the line connecting the center of the microlens unit, the center of the aperture, and the center of the photosensitive pixel unit in the light channel and the vertical direction of the substrate; γ - Vertex angle when the light channel is a cone with the photosensitive pixel unit as the apex; H - Spacing between two adjacent photosensitive pixel units; K - Spacing between the upper surface of the microlens unit in the optical recognition module and the lower surface of the substrate in the display panel; L1 - Spacing between two adjacent light-transmitting holes in the first direction; L2 - Spacing between two adjacent light-transmitting holes in the second direction; T1 - Diameter of the light-transmitting hole; T3 - Diameter of the light-transmitting hole. Detailed Implementation

[0034] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0035] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] It should also be noted that, unless otherwise explicitly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Biometric identification applied to under-display displays requires receiving, recording, or analyzing reflected light carrying specific biometric information to confirm and identify the individual to whom that biometric information belongs. Integrating optical modules for biometric identification onto display panels has become a common technology in this field. However, for display panels without polarization layers, the thin structure eliminates the need for a polarization layer because it uses a black matrix on a filter layer above the light-emitting unit. The black matrix's opacity blocks light beams outside the pixel unit, making the screen transmittance of external light close to zero. This structure also prevents light beams carrying biometric information from passing through, thus making it impossible to achieve under-display biometric identification in display panels without polarization layers.

[0038] To address the aforementioned issues, existing technologies propose incorporating light-transmitting holes in a black matrix (BM). When skin carrying biometric information, such as a finger, is placed against the display screen, reflected light carrying this biometric information passes through the holes and is received by an optical recognition module located beneath the screen. This enables the identification or imaging of biometric information in a display panel without a polarization layer. However, electronic devices capable of biometric identification or imaging typically involve separately designing and manufacturing the display panel and optical recognition module before assembly. If there are design discrepancies or poor matching during assembly, the imaging quality of the biometric information can easily become uneven, resulting in poor biometric identification capabilities.

[0039] One aspect of this application provides a display panel, such as... Figure 1As shown, the system includes a substrate 10, and a light-emitting structure 20, a filter layer 30, and a cover plate 40 sequentially disposed above the substrate 10. The filter layer 30 includes multiple filter units. As an example, the filter units may include a red filter unit 301, a green filter unit 302, and / or a blue filter unit 303. When the multiple filter units include multiple red filter units 301, multiple green filter units 302, and multiple blue filter units 303, the filter units correspond to the colors of each sub-pixel of the pixel unit. The red filter unit corresponds to the light-emitting side of the red sub-pixel to filter out stray light other than red light, the green filter unit corresponds to the light-emitting side of the green sub-pixel to filter out stray light other than green light, and the blue filter unit corresponds to the light-emitting side of the blue sub-pixel to filter out stray light other than blue light. The filter layer 30 also includes a black matrix (BM) 304 located between the filter units, wherein a light-transmitting hole 31 is provided on the black matrix 304, and a light beam incident from one side of the cover plate 40 can be emitted from the substrate 10 through the light-transmitting hole 31; as Figure 2 As shown, the display panel is divided into grids, at least in the biometric recognition area, and each grid contains at least one light-transmitting hole 31. Figure 2 The grid shown contains two light-transmitting holes 31.

[0040] like Figure 1 As shown, when skin carrying biometric information, such as a finger, is placed on the screen of the display panel, the reflected light carrying fingerprint information reflected by the skin of the finger will be emitted towards the cover plate. The light beam that enters the display panel of this embodiment from the side of the cover plate 40 passes through the light-transmitting hole 31 on the black matrix 304 and then exits after passing through the light-emitting structure 20 and the substrate 10 in sequence. Figure 1The dashed box in the diagram indicates a pixel unit. A pixel unit typically includes a combination of sub-pixels capable of color adjustment for color display, such as RGB (red, green, blue) sub-pixels, RG (red, green) sub-pixels, BG (blue, green) sub-pixels, etc. The sub-pixel combinations in a pixel unit correspond to the colors of the light emitted by the sub-pixel light-emitting units in the light-emitting structure 20. For example, in the corresponding light-emitting structure 20, the unit that excites red light is the red light-emitting material unit 2021, and the corresponding filter unit is the red filter unit 301, which is used to filter the emitted red light to improve the purity of the color. Of course, the specific composition of the light-emitting structure 20 is not limited in this embodiment, and correspondingly, the specific composition of the filter unit is not specifically limited either. For example, in one feasible implementation, the light-emitting structure can excite and emit red, green, and blue light, as well as light of other wavelengths such as white light, thereby forming a combination of sub-pixels in the pixel unit according to the corresponding design. Then, correspondingly, in the filter unit, the sub-pixel that emits white light also includes a white filter unit that allows light beams in the entire white light wavelength range to pass through. A black matrix 304 is set between adjacent filter units. The black matrix 304 can prevent the incident of stray light from the outside and also prevent crosstalk of the emitted light colors between the filter units, which would lead to poor display effect. The light-transmitting hole 31 set on the black matrix 304 ensures that the overall transmittance of the display panel is not equal to zero, thereby enabling the identification of biometric information under the screen.

[0041] The display panel is divided into grids according to a preset form, wherein at least the grid projection covers the biometric recognition area on the display panel used for biometric recognition. The grid is used to divide the position of at least the biometric recognition area on the display panel. The biometric recognition area is defined into multiple blocks by the grid projection. Each block corresponding to the grid projection contains at least one light-transmitting hole 31 on a black matrix 304.

[0042] It should be noted that dividing the display panel into grids does not involve actually segmenting or cutting the display panel. Rather, it should be understood as a reference for measurement or proportion. It is a virtual division that defines blocks within the biometric recognition area of ​​the display panel. Since the grid is not a physical structure in the real sense, it will not affect or interfere with the actual structure of the display panel. Because the goal is to accurately identify or uniformly and clearly image the light beam carrying biometric information emitted through the biometric recognition area of ​​the display panel, the grid at least defines the biometric recognition area, but it can also cover other areas of the entire display panel. For example, by providing light-transmitting holes 31 that meet the above distribution requirements throughout the entire display panel, the light-transmitting holes 31 can be evenly distributed across the entire screen. If a full surface of photosensitive pixel units is correspondingly arranged under the screen, biometric information recognition or imaging can be achieved across the entire screen.

[0043] Moreover, in this embodiment of the application, the shape and size of the grid used for virtual division are not specifically limited. For example, if the grid is divided small enough, each grid can contain only one light-transmitting hole 31. Or, if the grid is large, a grid may contain multiple light-transmitting holes 31.

[0044] This application provides a display panel including a substrate 10, and a light-emitting structure 20, a filter layer 30, and a cover plate 40 sequentially disposed above the substrate 10. The filter layer also includes a black matrix 304 located between the filter units, and a light-transmitting hole 31 is disposed on the black matrix 304. In the display panel, at least the biometric recognition area is divided into grids, and each grid contains at least one light-transmitting hole 31. When the display panel of this application is used for under-display biometric information recognition, an optical recognition module 01 is disposed under the display panel. The optical recognition module 01 receives a light beam carrying biometric information through a photosensitive pixel unit 0111. The light beam incident from one side of the cover plate 40 can enter the photosensitive pixel unit 0111 under the substrate 10 through the light-transmitting hole 31. By arranging the light-transmitting holes 31 on the black matrix 304 in the display panel, the photosensitive pixel unit 0111 can achieve balanced reception of the light beam carrying biometric information, thereby improving the accuracy of biometric information recognition and the overall quality of biometric information imaging.

[0045] In one feasible implementation of this application, such as Figure 2 As shown, the display panel is divided into grids, each with the same shape and size. That is, the grid is composed of regularly repeating intersecting lines to ensure that each grid has the same shape and size. For example, if the angle between the repeating intersecting lines is acute, the resulting grid is a parallelogram or rhombus; if the repeating intersecting lines are perpendicular, the resulting grid is a rectangle or square; if there are three or more repeating intersecting lines, a polygon is formed, and so on. The size of the grid is also determined by the distance between the repeating intersecting lines. As long as the shape and size of each grid are the same, the range of the biometric recognition area defined by each grid is the same. Moreover, using regularly repeating intersecting lines to form the grid reduces the design difficulty and the accuracy requirements for implementation.

[0046] In one feasible embodiment of this application, the light-transmitting holes 31 are arranged in an array on the black matrix 304, and the arrangement of the light-transmitting holes 31 satisfies one or more of the following conditions: the light-transmitting holes 31 are arranged in an array on the black matrix 304; the total area of ​​the light-transmitting holes contained in each grid is equal; and the number of light-transmitting holes contained in each grid is equal.

[0047] The light-transmitting apertures 31 are arranged in an array on the black matrix 304, such as Figure 3 As shown in the top view of the display panel in this application embodiment, the white dashed frame is a rectangle with the same preset size, which is one of the grids formed in the aforementioned scheme. The area enclosed by the white dashed frame is a rectangular area with a preset size. The arrangement of the light-transmitting holes 31 satisfies one or more of the following conditions: (1) The light-transmitting holes 31 are arranged in an array on the black matrix 304; (2) The total area of ​​the light-transmitting holes 31 contained in each grid is equal; (3) The number of light-transmitting holes 31 contained in each grid is equal.

[0048] In specific implementation methods, including as follows Figure 3 The arrangement shown can be the arrangement of the light-transmitting holes 31 themselves. The light-transmitting holes are arrayed on the black matrix 304. Each light-transmitting hole 31 can have the same shape and size, so each grid contains the same number of light-transmitting holes 31. Alternatively, each grid can contain light-transmitting holes 31, whether they are complete light-transmitting holes 31 or light-transmitting holes 31 that are divided by the grid edge. The total area of ​​the light-transmitting holes 31 contained in the grid is equal. Of course, it can also contain any combination of any two of the above conditions, or all three of the above conditions. Such a limitation can adapt to various specific design relationships between the light channel 020 and the photosensitive pixel unit 0111 in the optical recognition module.

[0049] Furthermore, in this embodiment, the shape and size of the light-transmitting hole 31 are not specifically limited; for example, it can be as follows: Figure 3 The rectangular hole shown can, of course, also be a round hole or other forms.

[0050] When the display panel of this application embodiment is used for under-display biometric information recognition, an optical recognition module 01 is set under the display panel. When a finger, palm, or other human body part is placed on the surface of the substrate 10 of the display panel, taking a finger as an example, external light or a light beam emitted from the display panel itself shines on the fingerprint of the finger and reflects it. The light beam carrying the biometric information reflected by the valleys and ridges of the fingerprint is reflected towards the under-display of the display panel. The light beam passes through the light-transmitting hole 31, the light-emitting structure 20, and the substrate 10 in sequence on the black matrix 304, and then enters the optical recognition module 01 under the substrate 10. This enables the optical recognition module 01 to collect, extract, process, and / or image information, so as to realize additional functions of electronic devices such as user identification and authentication by acquiring and / or recognizing the biometric information in the light beam reflected from the light-emitting side of the display panel.

[0051] In one feasible embodiment of this application, the example still involves setting an optical recognition module under the display panel, where the optical recognition module receives a light beam carrying biometric information through photosensitive pixel units. Figure 3 As shown, the spacing L1 between two adjacent light-transmitting holes 31 along the first direction is equal, and the spacing L2 between two adjacent light-transmitting holes 31 along the second direction is equal. In one example embodiment, the first direction is perpendicular to the second direction. While ensuring that each grid contains at least one light-transmitting hole 31, each light-transmitting hole 31 has the same shape, and the length and width of the matrix are arranged at regular intervals. Combined with the regular arrangement of the filter units in the display panel, this facilitates the design of the arrangement of the light-transmitting holes 31 and effectively provides better production efficiency and processing yield.

[0052] To better ensure that there is at least one light-transmitting hole 31 within a grid area of ​​any preset rectangular region, and that the light-transmitting hole 31 satisfies at least one of the aforementioned three conditions, the specific shape and size of the light-transmitting hole 31 can be limited to assist in achieving this. In one feasible embodiment of this application, the cross-section of the light-transmitting hole 31 is circular; that is, considering processing efficiency and yield, the light-transmitting hole 31 is a circular hole, and its diameter T1 is set between 5μm and 15μm. For example, the diameter T1 of the circular light-transmitting hole 31 can be set to 5μm, 6μm, 8μm, 10μm, 12μm, 15μm, etc. In another feasible embodiment of this application, the cross-section of the light-transmitting hole 31 is any one of ellipse, polygon, and irregular shape, such as ellipse, rectangle, hexagon, or regular special shape. For this type of light-transmitting hole 31, the diameter of the circumscribed circle of the light-transmitting hole 31 is set between 5μm and 20μm. For example, the diameter of the circumscribed circle of the light-transmitting hole 31 is set between 5μm and 20μm. Figure 3 The outer diameter of the rectangular light-transmitting hole 31 shown is set to 5μm, 8μm, 10μm, 12μm, 15μm, 20μm, etc.

[0053] In another feasible embodiment of this application, in order to ensure that the number of light beams carrying biometric information passing through the display panel can reach the basic number required for biometric information recognition or biometric information imaging in the optical recognition module, and to avoid the inability to extract enough biometric information due to insufficient light beams carrying biometric information, the distance between any two adjacent light-transmitting holes 31 is limited to less than or equal to 100μm. That is, by limiting the distance between the light-transmitting holes 31 provided on the black matrix 304, the light transmittance formed by the light-transmitting holes 31 on the black matrix 304 can be guaranteed, thereby ensuring that enough light beams carrying biometric information pass through and enter the optical recognition module.

[0054] Of course, those skilled in the art should know that limiting the distance between any two adjacent light-transmitting holes 31 to less than or equal to 100 μm is to ensure the light transmittance formed on the black matrix 304 through the light-transmitting holes 31. Under this condition, those skilled in the art can specifically set the value of the distance between any two adjacent light-transmitting holes 31 according to the shape and size of the light-transmitting holes 31. For example, if the light-transmitting hole 31 is a circular hole and the diameter T1 is small, the distance between two adjacent light-transmitting holes 31 can be set to 20 μm or less. By increasing the density of the light-transmitting holes 31, the total area of ​​the light-transmitting holes 31 contained in the grid or the number of light-transmitting holes 31 contained in the grid can be increased.

[0055] In the display panel of this application embodiment, a light-transmitting hole 31 is formed on the black matrix 304, which is capable of transmitting light beams. The method of forming the light-transmitting hole 31 is not specifically limited. For example, the light-transmitting material can be used to fill the position of the light-transmitting hole 31 in the black matrix 304 so that the position of the light-transmitting hole 31 can transmit light beams. Alternatively, a through hole can be directly processed on the position of the light-transmitting hole 31 in the black matrix 304 to allow light beams to pass through. Other methods that can be conceived and utilized by those skilled in the art can also be used, as long as the light-transmitting hole 31 can transmit light beams to the screen so that they can be received by the optical recognition module.

[0056] In one feasible implementation of this application, such as Figure 4 As shown, the light-emitting structure 20 includes a first electrode layer 201, a light-emitting material layer 202, and a second electrode layer 203 sequentially disposed on the substrate 10. The first electrode layer 201 and the second electrode layer 203 are an anode layer and a cathode layer used to form an electric field to excite the light-emitting material layer 202. In this embodiment, there is no specific limitation on whether the first electrode layer 201 is an anode layer and the second electrode layer 203 is a cathode layer, or whether the first electrode layer 201 is a cathode layer and the second electrode layer 203 is an anode layer. Those skilled in the art should know that specific settings can be made according to the light-emitting direction and packaging requirements.

[0057] The light-emitting material layer 202 includes a red light-emitting material unit 2021 corresponding to a red sub-pixel in the pixel unit, a green light-emitting material unit 2022 corresponding to a green sub-pixel, and / or a blue light-emitting material unit 2023 corresponding to a blue sub-pixel. The red light-emitting material unit 2021 is excited to emit red light and corresponds to a red filter unit 301. The green light-emitting material unit 2022 is excited to emit green light and corresponds to a green filter unit 302. The blue light-emitting material unit 2023 is excited to emit blue light and corresponds to a blue filter unit 303. The light-emitting material layer 202 also has a pixel definition material unit 2024 between each sub-pixel.

[0058] It should be noted that the Pixel Define Layer (PDL) 2024 is used to define two adjacent sub-pixels and prevent different luminescent materials from interfering with each other. It can typically be a separate layer, leaving space for light emission at the positions of different sub-pixels. Alternatively, it can be a material placed between the luminescent materials of two sub-pixels in the luminescent material layer 202. The Pixel Define Layer 2024 can be a material with a certain proportion of light transmittance, or it can be black as the pixel boundary. The following explanation uses a black material or other opaque material as an example for further explanation.

[0059] Still for reference Figure 4 As shown, a light-transmitting hole 21 is provided on the pixel defining material unit 2024 corresponding to the light-transmitting hole 31. A light beam incident from one side of the cover plate 40 passes sequentially through the light-transmitting hole 31 and the light-transmitting hole 21 before entering the corresponding photosensitive pixel unit 0111 in the optical recognition module 01. Thus, a light beam reflected from one side of the cover plate 40 into the display panel needs to pass sequentially through the light-transmitting hole 31 on the black matrix 304 and the light-transmitting hole 21 on the light-emitting material layer 202 before entering the optical recognition module 01. It should be understood that the light-transmitting hole 31 and the light-transmitting hole 21 corresponding to the same light beam, as well as the photosensitive pixel unit 0111 in the optical recognition module 01, need to satisfy the aforementioned correspondence between the light-transmitting hole 31 and the photosensitive pixel unit 0111. Furthermore, it should be noted that the formation method and cross-sectional shape of the light-transmitting hole 21 on the light-emitting material layer 202 are not specifically limited in this embodiment. Those skilled in the art can refer to the description of the formation method and cross-sectional shape of the light-transmitting hole 31 for equivalent consideration and setting.

[0060] In some embodiments of this application, the pixel definition material unit 2024 used to define sub-pixels is a light-transmitting material (transparent or semi-transparent, etc., with a preset light transmission ratio). If the pixel definition material unit 2024 with the preset light transmission ratio can meet the light beam transmission requirements for biometric information recognition, then it is not necessary to open the light-transmitting hole 21 for such pixel definition material unit 2024.

[0061] In some embodiments of this application, the first angle α between the line connecting the center of the light-transmitting hole 31 and the center of the corresponding light-transmitting hole 21 and the vertical direction of the substrate 10 is between 0° and 15°.

[0062] For example, such as Figure 4 As shown, the line connecting the center of the light-transmitting hole 31 and the center of the corresponding light-passing hole 21 coincides with the vertical direction of the substrate 10, that is, the first included angle α is 0°. In this case, the light beam carrying biometric information is vertical and passes through the light-transmitting hole 31 and the corresponding light-passing hole 21 in sequence before entering the corresponding photosensitive pixel unit 0111 of the optical recognition module 01.

[0063] For example, such as Figure 5 As shown, the line connecting the center of the light-transmitting hole 31 and the center of the corresponding light-transmitting hole 21 has a first angle α with the vertical direction of the substrate 10. In this case, the light beam carrying biometric information is inclined at this first angle α and passes through the light-transmitting hole 31 and the corresponding light-transmitting hole 21 in sequence before entering the corresponding photosensitive pixel unit 0111 of the optical recognition module 01. The first angle α is usually set in the range of less than 15°. Moreover, the direction of inclination of the line connecting the center of the light-transmitting hole 31 and the center of the corresponding light-transmitting hole 21 with respect to the vertical direction of the substrate 10 is not specifically limited in this embodiment, as long as the inclination direction of the line connecting the centers of multiple light-transmitting holes 31 and the centers of the corresponding light-transmitting holes 21 is the same and the angle of the first angle α is the same.

[0064] It should be noted that, in this embodiment of the application, the relationship between the opening sizes of the light-transmitting hole 31 and the corresponding light-passing hole 21 is not specifically limited, such as... Figure 4 As shown, the diameter T1 of the light-transmitting hole 31 is larger than the diameter T3 of the light-passing hole 21, but it is not limited to this. For example, the diameter T1 of the light-transmitting hole 31 can also be set to be equal to the diameter T3 of the light-passing hole 21, or the diameter T1 of the light-transmitting hole 31 can be smaller than the diameter T3 of the light-passing hole 21. However, since when the first included angle α is 0°, the beam carrying biometric information is perpendicular and passes through the light-transmitting hole 31 and the corresponding light-passing hole 21 in sequence before being emitted from the substrate 10, the smaller diameter hole in the light-transmitting hole 31 and the corresponding light-passing hole 21 determines how much beam of light can pass through. Therefore, it should be understood that, under normal circumstances, the difference between the diameter T1 of the light-transmitting hole 31 and the diameter T3 of the corresponding light-passing hole 21 should not be too large.

[0065] When the display panel in this embodiment, which has a light-transmitting hole 31 on the black matrix 304 and a light-transmitting hole 21 on the pixel defining material unit 2024, is used for biometric information recognition, if the display panel is in a dry and cold environment, it can be used as follows: Figure 5 The light beam acquisition method shown has a fixed first angle α. The light beam carrying biometric information is incident at a certain angle, which can avoid the occurrence of the opposite imaging state and effectively solve the problem of difficulty in accurately identifying biometric information in dry and cold environments. The first angle α is usually limited to within 15°. If the first angle α is greater than 15°, the excessive tilt of the light beam may cause difficulties in the effective reception of the light beam by the photosensitive pixel unit 0111 or other adverse derivative problems.

[0066] In one feasible embodiment of this application, the light-emitting structure 20 further includes a metal trace disposed below the first electrode layer 201, the metal trace being disposed outside the light path range formed by the light-transmitting hole 31 and the light-passing hole 21.

[0067] In the light-emitting structure 20, at least on the first electrode layer 201, there are traces of metal or other conductive materials. If there are metal traces within the range corresponding to the light path formed by the light-transmitting hole 31, the light beam passing through the light path will be blocked to a certain extent due to irradiation by the metal traces, affecting the efficiency of acquiring biometric information. Moreover, the reflection of the light beam through the metal traces may also affect the display effect of the display panel. Therefore, the metal traces that need to be provided in the first electrode layer 201 are firstly placed below the first electrode layer 201, and located between the light-transmitting hole 21 and the light-transmitting hole. Outside the range of the light path formed by the light-transmitting hole 31, for example, it can be located below the projection of the pixel-defining material unit 2024. In this way, even if the light beam is reflected when it shines on the metal trace, it will be blocked by the pixel-defining material unit 2024 above, preventing it from returning to the display side of the display panel and affecting the display effect. Moreover, the metal trace is designed to bypass the range of the light path formed by the light-transmitting hole 31, exposing the range of the light path formed by the light-transmitting hole 31, and avoiding obstruction and impact on the light beam carrying biometric information passing through the light path.

[0068] It should be noted that the optical path range refers to the entire optical path through which the beam carrying biological information passes through each layer of the display panel and then enters the optical recognition module 01. Therefore, it should be understood that when the display panel in this embodiment only includes the light-transmitting hole 31 on the black matrix 304, the optical path range should be related to the light-transmitting hole 31 and the corresponding photosensitive pixel unit 0111. If it also includes the light-transmitting hole 21 in the pixel definition material unit 2024, the microlens unit 0231 in the optical recognition module 01, etc., then the optical path range should be formed by these optical path components. Similarly, if the display panel is an optical path structure including the light-transmitting hole 31 and the light-transmitting hole 21, then the wiring avoidance design must simultaneously satisfy the avoidance within the range of the optical path formed by the light-transmitting hole 31 and the light-transmitting hole 21 in the same correspondence, that is, it should be set outside this range.

[0069] In one feasible embodiment of this application, a touch layer is further provided under the cover plate 10. For example, in one feasible embodiment, the touch layer can be disposed between the filter layer 30 and the second electrode layer 203. The touch layer includes a first touch electrode layer and a second touch electrode layer disposed at intervals. Electrode lines covering the plane area are respectively distributed on the first touch electrode layer and the second touch electrode layer. The electrode lines on the first touch electrode layer and the electrode lines on the second touch electrode layer are intersecting to make the touch layer define the touch plane in a grid shape in the projection direction. When the user touches the screen with their finger, since the finger is an electrical conductor, the spatial intersection point between the electrode lines of the first touch electrode layer and the electrode lines of the second touch electrode layer at the finger touch position forms a coupling capacitor due to the influence of the human body's electric field. The touch position can be determined through this coupling capacitor, and the touch operation is realized. Therefore, by providing a touch layer under the cover plate 10, the display panel of this embodiment can realize color display and biometric recognition, while also realizing under-screen touch operation.

[0070] Based on this, similar to the avoidance method of the light-emitting structure 20, the traces on the touch layer can also be arranged to avoid the light path formed by the light-transmitting hole 31. Although the electrode lines on the touch layer usually use transparent conductive materials such as ITO (Indium Tin Oxide) to minimize the impact on the display under the screen, there are still metal traces in the touch layer, and the traces of ITO material will still cause a certain degree of obstruction and reflection of the passing light beam. Therefore, in order to minimize the impact of the traces on the touch layer on the light beam of display and biometric recognition, the traces on the touch layer are also arranged to avoid the light path formed by the light-transmitting hole 31.

[0071] Another aspect of the embodiments of this application, please refer to Figure 6 An optical recognition module 01 is provided, including an optical path guiding layer 02 and a plurality of photosensitive pixel units 0111. A plurality of optical channels 020 are formed on the optical path guiding layer 02. The optical path guiding layer 02 includes at least two light-shielding layers spaced apart and a plurality of microlens units 0231 on the light-shielding layers. An aperture is formed on the light-shielding layer. The corresponding apertures and microlens units 0231 on the at least two light-shielding layers form an optical channel 020 corresponding to a photosensitive pixel unit 0111. The second angle β between the line connecting the center of the microlens unit 0231, the center of the aperture, and the center of the photosensitive pixel unit 0111 in the optical channel 020 and the vertical direction of the substrate 10 is between 0° and 15°.

[0072] It should be noted that, in the embodiments of this application, the specific implementation of the photosensitive pixel unit 0111 in the optical recognition module 01 is not limited. For example, the photosensitive pixel unit 0111 can be a photodiode or other optical device that can receive light signals, convert them into electrical signals, and extract the biometric information carried in the light signals.

[0073] like Figure 6 As shown, the optical path guiding layer 02 of the optical recognition module 01 includes a first light-shielding layer 021 and a second light-shielding layer 022 spaced apart, and a plurality of microlens units 0231 thereon. The first light-shielding layer 021 is provided with a plurality of first apertures 0211, and the second light-shielding layer 022 is provided with a plurality of second apertures 0221. Therefore, the first apertures 0211, the second apertures 0221 and the microlens units 0231 correspond to the photosensitive pixel units 0111 to form an optical channel 020. The line connecting the center of the microlens unit 0231, the center of the first aperture 0211, the center of the second aperture 0221 and the center of the photosensitive pixel unit 0111 in the optical channel 020 has a second included angle β with the vertical direction of the substrate 10. The angle of the second included angle β is set between 0° and 15°.

[0074] In some embodiments of this application, for example, such as Figure 6 As shown, the line connecting the center of the microlens unit 0231, the center of the first aperture 0211, the center of the second aperture 0221, and the center of the photosensitive pixel unit 0111 in the light channel 020 coincides with the vertical direction of the substrate 10, that is, the second included angle β is 0°. In this case, the light beam carrying biometric information emitted from the display panel passes vertically through the microlens unit 0231, the first aperture 0211, and the second aperture 0221 of the light channel 020 to reach the photosensitive pixel unit 0111 corresponding to the light channel 020.

[0075] For example, such as Figure 7 As shown, the line connecting the center of the microlens unit 0231, the center of the first aperture 0211, the center of the second aperture 0221, and the center of the photosensitive pixel unit 0111 in the light channel 020 has a second angle β with the vertical direction of the substrate 10. In this case, the light beam carrying biometric information emitted from the display panel is tilted at this second angle β and passes through the microlens unit 0231, the first aperture 0211, and the second aperture 0221 of the light channel 020 to reach the photosensitive pixel unit 0111 corresponding to the light channel 020. The second angle β is usually set in the range of less than 15°. Moreover, the direction of the tilt of the light channel 020 relative to the vertical direction of the substrate 10 is not specifically limited in this embodiment, as long as the tilt direction of the multiple light channels 020 is the same and the angle of the second angle β is the same.

[0076] It should be noted that, in the embodiments of this application, the relationship between the opening sizes of the microlens unit 0231, the first aperture 0211, and the second aperture 0221 forming an optical channel 020 is not specifically limited. Figure 7 In the example shown, the first aperture 0211 and the second aperture 0221 have the same opening size and shape, and the field of view of the microlens unit 0231 is slightly larger so that as many light beams carrying biometric information as possible can be received by the microlens unit 0231 and then converged and passed through the first aperture 0211 and the second aperture 0221 in sequence and received by the photosensitive pixel unit 0111. Of course, other size relationships can also be designed, such as making the first aperture 0211 slightly larger than the second aperture 0221.

[0077] Furthermore, when the optical recognition module 01 of this application embodiment is disposed under the display panel to receive a beam of light carrying biometric information incident through the display panel, if the line connecting the center of the microlens unit 0231, the center of the first aperture 0211, the center of the second aperture 0221, and the center of the photosensitive pixel unit 0111 in the light channel 020 has a second included angle β with the vertical direction of the substrate 10, then in the corresponding display panel, the line connecting the center of the corresponding light-transmitting hole 31 and the center of the light-passing hole 21 also has a first included angle α with the vertical direction of the substrate 10. The angle of the first included angle α is the same as the angle of the second included angle β, and the tilt direction relative to the vertical direction of the substrate 10 is also the same. That is, the light path of the beam carrying biometric information in the display panel and the light channel 020 in the optical recognition module 01 are on a straight line to ensure that the beam is transmitted as losslessly as possible until it is received by the photosensitive pixel unit 0111.

[0078] In one feasible embodiment of this application, the optical channel 020 is cone-shaped with the photosensitive pixel unit 0111 as the apex, and the apex angle γ of the cone is less than or equal to 10°.

[0079] The light channel 020 has a conical structure with an apex angle γ less than or equal to 10°, which can receive light beams carrying biometric information in a panoramic view within a certain angle range centered on the vertical direction of the substrate 10, so that as many light beams as possible within this range can be received by the photosensitive pixel unit 0111, reducing the loss during the light beam transmission process.

[0080] It should be noted that the cone shape described in the embodiments of this application refers to the general shape of the light transmission range formed by each light beam in the light channel 020. Since the apex of the cone structure is located at the photosensitive pixel unit 0111 that receives the light beam, it should be understood that, in a microscopic state, the photosensitive pixel unit 0111 does not actually receive the light beam at a single point, but rather as a smaller receiving surface. Alternatively, when a light channel 010 corresponds to multiple photosensitive pixel units 0111 receiving the light beam, it is a surface composed of multiple smaller receiving surfaces. Here, it is only macroscopically regarded as the apex of the cone, and does not mean that the photosensitive pixel unit 0111 is limited to receiving the light beam at a single point.

[0081] In one feasible embodiment of this application, taking a plurality of photosensitive pixel units 0111 distributed in a matrix as an example, the plurality of photosensitive pixel units 0111 arranged along the first direction are as follows: Figure 8 As shown, the spacing H between two adjacent photosensitive pixel units 0111 is less than or equal to 80μm. Preferably, H = 10.75μm, 21.5μm, 43μm, or 64.5μm.

[0082] The distance H between two adjacent photosensitive pixel units 0111 refers to the center distance between two adjacent photosensitive pixel units 0111. Setting the distance H between two adjacent photosensitive pixel units 0111 to be less than or equal to 80μm can ensure that the light beams that reach the photosensitive pixel units 0111 through the light channel 020 of the display panel and the optical recognition module 01 can be received by the photosensitive pixel units 0111 as much as possible, thereby improving the working efficiency and receiving capability of the photosensitive pixel units 0111.

[0083] In one feasible embodiment of this application, an infrared filter layer is disposed between the microlens unit 0231 and the photosensitive pixel unit 0111.

[0084] An infrared filter layer is disposed between the microlens unit 0231 and the photosensitive pixel unit 0111. The infrared filter layer can be located between the microlens unit 0231 and the first light-shielding layer 021, between the first light-shielding layer 021 and the second light-shielding layer 022, such that the first light-shielding layer 021 and the second light-shielding layer 022 are separated by the infrared filter layer, and at least one location between the second light-shielding layer 022 and the photosensitive pixel unit 0111. The infrared filter layer can filter out infrared light passing through the light beam. Infrared light has poor ability to carry biometric information and will interfere with the photosensitive pixel unit 0111's reception, analysis, and processing of biometric information in the light beam. Interference caused by biometric information can be mitigated by filtering out infrared light, thereby improving the ability of the photosensitive pixel unit 0111 to receive, analyze, and process light beams carrying biometric information, thus enhancing the recognition or imaging effect of biometric information. Furthermore, if the infrared filter layer is placed between the first light-shielding layer 021 and the second light-shielding layer 022, sufficient spacing can be ensured between the first light-shielding layer 0211 on the first light-shielding layer 021 and the second light-shielding layer 0221, so that the required spacing distance for forming the light channel 020 can be achieved between the first aperture 0211 on the first light-shielding layer 021 and the second aperture 0221 on the second light-shielding layer 022.

[0085] Of course, if the optical recognition module 01 also includes other optical elements for beam shaping, it can also shape and combine the beam carrying biometric information incident from the display panel to further improve the light collection efficiency of the photosensitive pixel unit 0111.

[0086] In another aspect of the embodiments of this application, an electronic device is provided, including a display panel and an optical recognition module 01 under the display panel, wherein the display panel is any of the aforementioned display panels, and / or the optical recognition module 01 is any of the aforementioned optical recognition module 01.

[0087] In one feasible implementation of this application, such as Figure 9 As shown, a biometric identification area BB is provided on the display panel, and the light beam carrying biometric information passing through the biometric identification area BB is received by the photosensitive pixel unit 0111 of the optical identification module 01.

[0088] For example, if the electronic device in this embodiment is a handheld mobile terminal such as a mobile phone, then a biometric identification area BB is defined in a fixed area of ​​the mobile phone, and an optical identification module 01 is provided under the screen corresponding to the biometric identification area BB. When a finger is placed on the display panel surface at the biometric identification area BB, a reflected light beam carrying biometric information passes through the display panel and enters the optical identification module 01, where it is received by the photosensitive pixel unit 0111. The biometric identification area BB can be as follows: Figure 9The image shows the display area of ​​the display panel, or it could be set in the non-display area of ​​the display panel; this application embodiment does not specifically limit this.

[0089] By pre-dividing the biometric information recognition area BB on the display panel, the optical recognition module 01 can be accurately set at the corresponding position under the screen. This avoids the cost waste and low utilization rate caused by setting optical recognition modules 01 in various places under the screen, and minimizes the interference and impact of biometric information recognition function on other functions of the electronic device itself.

[0090] In one feasible embodiment of this application, the spacing L between two adjacent light-transmitting holes 31 along the first direction on the display panel satisfies: L≤M / N(1) Where M is the width of the object surface region corresponding to the optical recognition module 01 along the first direction; N is the resolution of the imaging image acquired by the optical recognition module 01 in the first direction.

[0091] To achieve clear image display, the display panel needs to set the resolution of the displayed image accordingly. The resolution typically includes the smallest resolvable pixel unit in the first direction and the second direction. Taking the first direction as an example, the distance L between two adjacent light-transmitting holes 31 in the first direction should be less than or equal to the ratio of the width M of the object surface area corresponding to the optical recognition module 01 along the first direction to the resolution N of the image acquired by the optical recognition module 01 in the first direction. In this way, it can be ensured that the range of the smallest resolvable pixel unit of the image in the first direction can include the light beam carrying biometric information reflected from the width range of the object surface area, thereby improving the clarity and accuracy of the biometric information image when the optical sensor 01 images the image.

[0092] For example, in a certain case, the distance L between two adjacent light-transmitting holes 31 in the first direction is about 47 μm, and the ratio of the width M of the object surface area corresponding to the optical recognition module 01 along the first direction to the resolution N of the imaging image acquired by the optical recognition module 01 in the first direction is 43 μm.

[0093] Alternatively, the spacing L between two adjacent light-transmitting holes 31 along the first direction on the display panel satisfies: L≤A*M / H(2; Where A is the number of photosensitive pixel units 0111 corresponding to one image pixel in the first direction, and H is the number of photosensitive pixel units 0111 in the first direction of the optical recognition module 01.

[0094] When an image pixel in an image contains multiple photosensitive pixel units 0111 in the first direction, the number H of photosensitive pixel units 0111 in the optical recognition module 01 in the first direction should be divided according to the number of photosensitive pixel units 0111 contained in an image pixel in the first direction. That is, taking the first direction as an example, the distance L between two adjacent light-transmitting holes 31 in the first direction should be less than or equal to the ratio of the number A of photosensitive pixel units 0111 contained in an image pixel in the first direction multiplied by the width M of the object surface area corresponding to the optical recognition module 01 along the first direction to the number H of photosensitive pixel units 0111 in the first direction of the optical recognition module 01. Similarly, the above inequality (1) or inequality (2) should also be satisfied in the second direction, which will not be repeated here.

[0095] In one feasible embodiment of this application, the line connecting the center of the microlens unit 0231, the center of the aperture, and the center of the photosensitive pixel unit 0111 of the light channel 020 in the optical recognition module 01 coincides with the vertical direction of the substrate 10. A light-transmitting hole 31 corresponds to a light channel 020 in the optical recognition module 01. Alternatively, the display panel also includes a light-transmitting hole 21 on the pixel definition material unit 2024 that corresponds to the light-transmitting hole 31. A corresponding set of light-transmitting holes 31 and light-transmitting holes 21 corresponds to a light channel 020 in the optical recognition module 01.

[0096] In the aforementioned targeting Figure 6 The explanation of the display panel has already detailed an embodiment in which the line connecting the center of the microlens unit 0231, the center of the aperture, and the center of the photosensitive pixel unit 0111 in the light channel 020 of the optical recognition module 01 coincides with the vertical direction of the substrate 10. Figure 4 As shown, a light-transmitting aperture 31 corresponds to a light channel 020 in the optical recognition module 01, and is used to receive a light beam carrying biometric information. Continuing as... Figure 4 As shown, when the display panel also includes a light-transmitting hole 21 on the pixel definition material unit 2024 corresponding to the light-transmitting hole 31, the corresponding set of light-transmitting holes 31 and light-transmitting holes 21 corresponds to a light channel 020 in the optical recognition module 01.

[0097] In one feasible embodiment of this application, the line connecting the center of the microlens unit 0231, the center of the aperture, and the center of the photosensitive pixel unit 0111 of the optical channel 020 in the optical recognition module 01 has a second included angle β with the vertical direction of the substrate 10. The display panel also includes a light-transmitting hole 21 on the pixel definition material unit 2024 corresponding to the light-transmitting hole 31. The second included angle β is equal to or approximately equal to the first included angle α between the line connecting the center of the corresponding light-transmitting hole 31 and the center of the light-transmitting hole 21 and the vertical direction of the substrate 10. That is, the difference between the second included angle β and the angle between the line connecting the center of the corresponding light-transmitting hole 31 and the center of the light-transmitting hole 21 and the first included angle α between the vertical direction of the substrate 10 is within a preset threshold range, for example, within 2°, which can also be regarded as approximately equal. One optical channel 020 corresponds to at least one set of light-transmitting holes 31 and light-transmitting holes 21.

[0098] When the distance L between two adjacent light-transmitting holes 31 is small enough, the light channel 020 has a second included angle β, and the angles of the first included angle α and the second included angle β between the line connecting the center of the corresponding light-transmitting hole 31 and the center of the light-passing hole 21 in the display panel and the vertical direction of the substrate 10 are equal or approximately equal, one light channel 020 in the optical recognition module 01 can cover the light path range on multiple sets of display panels.

[0099] In one feasible embodiment of this application, the optical channel 020 of the optical recognition module 01 is cone-shaped with the photosensitive pixel unit 0111 as the apex. The projection of the bottom surface of the cone onto the cover plate 40 and the projection of the light-transmitting hole 31 onto the cover plate 40 are both present. The projection of the bottom surface covers the projection of at least one light-transmitting hole 31. The ratio of the maximum total area to the minimum total area of ​​the projection of the light-transmitting hole 31 covered by the projection of the bottom surface of the cone is less than or equal to 3.

[0100] Please refer to Figure 8 , Figure 8The optical channel 020 of the optical recognition module 01 is cone-shaped with the photosensitive pixel unit 0111 as the apex. When the optical recognition module 01 in this embodiment is applied to the under-display biometric information recognition or imaging of the display panel, the bottom surface of the cone-shaped optical channel 020 is projected onto the cover plate 40 on the display panel, and the projection is located within the range of the biometric information recognition area BB. The projection of the bottom surface of the cone should cover the projection of at least one light-transmitting hole 31 on the black matrix 304 onto the cover plate 40. Moreover, the projection of the light-transmitting hole 31 may not be a complete one or more, or it may cover a part of one or more light-transmitting holes 31, depending on the degree of matching between the design of the optical channel 020 on the optical recognition module 01 and the arrangement design of the light-transmitting holes 31 on the display panel. However, at least the following conditions must be met: within the area covered by the projection of the cone-shaped bottom surface of multiple optical channels 020, the total area of ​​the projection of the light-transmitting hole 31 within the coverage area can be calculated. The ratio between the maximum value of the total area of ​​the projection of the light-transmitting hole 31 within the coverage area and the minimum value of the total area of ​​the projection of the light-transmitting hole 31 within the coverage area is less than or equal to 3. That is, controlling this difference within 3 can make the intensity of the light beam delivered to the corresponding photosensitive pixel unit 0111 through each optical channel 020 relatively uniform, thereby avoiding noise problems caused by excessively dense local light beam acquisition, and also avoiding uneven image clarity caused by excessively sparse local light beam acquisition.

[0101] In one feasible embodiment of this application, the optical recognition module 01 can be pre-divided into multiple virtual pixel grids with a preset size as the side length, and the light channel 020 corresponding to the photosensitive pixel unit 0111 in each pixel grid covers at least one light-transmitting hole 31 in the display panel.

[0102] In this way, each photosensitive pixel unit 0111 can be pre-matched and connected with multiple light-transmitting holes 31 on the display panel through the light channel 020 according to the pre-designed virtual pixel grid, so that the optical recognition module 01 and the display panel have a preset matching effect, thereby enabling the electronic device to obtain an image with better uniformity of clarity when performing biometric information imaging.

[0103] In one feasible implementation of this application, such as Figure 9 As shown, the upper surface of the microlens unit 0231 in the optical recognition module 01 and the lower surface of the substrate 10 in the display panel have a gap distance K, which is less than 1000μm.

[0104] Furthermore, the spacing distance K can be set between 20μm and 600μm to achieve better imaging between the display panel and the optical recognition module 01. For example, values ​​can be taken from 20μm, 30μm, 50μm, 80μm, 100μm, 200μm, 500μm, and 600μm, and matched with the size and spacing of the light-transmitting holes 31 on the display panel, and the number and arrangement of the photosensitive pixel units 0111 in the optical recognition module 01.

[0105] The electronic device provided in this application embodiment has an optical recognition module 01 disposed under a display panel. The display panel includes a substrate 10, and a light-emitting structure 20, a filter layer 30, and a cover plate 40 disposed sequentially on the substrate 10. The substrate 10 is used to support other structures thereon and ensure that light can pass through. The light-emitting structure 20 is excited by light, and different excitation materials on the light-emitting structure 20 emit light of different wavelengths to realize active color light emission of the display panel. The filter layer 30 includes multiple filter units, which can be a red filter unit 301, a green filter unit 302, and / or a blue filter unit. Unit 303 corresponds to each sub-pixel in the pixel unit. Red filter unit 301 corresponds to the light-emitting side of the red sub-pixel to filter out stray light other than red light, green filter unit 302 corresponds to the light-emitting side of the green sub-pixel to filter out stray light other than green light, and blue filter unit 303 corresponds to the light-emitting side of the blue sub-pixel to filter out stray light other than blue light, thereby improving the purity of the emitted red, green, and blue light. The filter layer also includes a black matrix 304 located between the filter units. The black matrix 304 is made of black or other completely opaque material to ensure zero light transmission at the black matrix 304. However, a light-transmitting hole 31 is also provided on the black matrix 304. In the display panel, at least the biometric recognition area is divided into grids, and each grid contains at least one light-transmitting hole 31. When the display panel of this embodiment is used for under-display biometric information recognition, an optical recognition module 01 is provided under the display panel. The optical recognition module 01 receives a light beam carrying biometric information through the photosensitive pixel unit 0111. The second angle β between the line connecting the center of the microlens unit 0231, the center of the aperture, and the center of the photosensitive pixel unit 0111 in the light channel 020 and the vertical direction of the substrate 10 is... Between 0° and 15°, a light beam incident from one side of the cover plate 40 can enter the optical recognition module 01 under the substrate 10 through the light-transmitting hole 31. After passing through the corresponding light channel 020, it is received by the corresponding photosensitive pixel unit 0111. By designing the arrangement of the light-transmitting holes 31 on the black matrix 304 in the display panel, as well as the design of the angle and coverage of the light channel 020 in the corresponding optical recognition module 01, the photosensitive pixel unit 0111 can achieve balanced reception of the light beam carrying biometric information, thereby improving the accuracy of biometric information recognition and the overall quality of biometric information imaging.

[0106] The full field of view of the microlens unit 0231 can be limited to less than or equal to 10°, and more preferably, the full field of view of the microlens unit 0231 can be limited to 5°. Within this field of view range, the microlens unit 0231 can meet the shaping processing of the light beam carrying biometric information in the display panel, thereby maximizing the light beam reception efficiency of the corresponding photosensitive pixel unit 0111.

[0107] Furthermore, it should be noted that, in the above formulas, any numerical or relational constraints are allowed to vary or have errors within a range of 40 micrometers, which will not significantly affect the quantity and accuracy of beam reception.

[0108] Biometric technology has been widely applied to various terminal devices and electronic devices. Biometric identification technologies include, but are not limited to, fingerprint recognition, palm print recognition, vein recognition, iris recognition, face recognition, liveness detection, and anti-counterfeiting technologies. Fingerprint recognition typically includes optical fingerprint recognition, capacitive fingerprint recognition, and ultrasonic fingerprint recognition. With the rise of full-screen technology, fingerprint recognition modules can be placed in a partial or complete area under the display screen, thus forming under-display optical fingerprint recognition.

[0109] Fingerprint recognition methods typically include steps such as fingerprint image acquisition, preprocessing, feature extraction, and feature matching. Some or all of these steps can be implemented using traditional computer vision (CV) algorithms, or using deep learning algorithms based on artificial intelligence (AI). Fingerprint recognition technology can be applied to portable or mobile terminals such as smartphones, tablets, and gaming devices, as well as other electronic devices such as smart locks, cars, and bank ATMs for fingerprint unlocking, fingerprint payment, fingerprint attendance, and identity authentication.

[0110] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A display panel, characterized in that, The display panel includes a substrate, and a light-emitting structure, a filter layer, and a cover plate sequentially disposed on the substrate. The filter layer includes multiple filter units, including red, green, and / or blue filter units. The filter layer also includes a black matrix located between the filter units. A light-transmitting hole is provided on the black matrix, through which a light beam incident from one side of the cover plate can exit from the substrate. At least the biometric recognition area of ​​the display panel is divided into grids, each grid containing at least one light-transmitting hole. The light-emitting structure includes pixel-defining material units, each pixel-defining material unit having a light-passing hole corresponding to the light-transmitting hole. A light beam incident from one side of the cover plate exits sequentially through the light-transmitting hole and the light-passing hole. The first angle between the line connecting the center of the light-transmitting hole and the center of the corresponding light-passing hole and the vertical direction of the substrate is between 0° and 15°. A light beam carrying biometric information passing through the biometric recognition area is incident at a certain angle and received by the photosensitive pixel unit of the optical recognition module disposed under the display panel.

2. The display panel according to claim 1, characterized in that, Each of the grids has the same shape and size.

3. The display panel according to claim 1, characterized in that, The arrangement of the light-transmitting holes satisfies one or more of the following conditions: The light-transmitting holes are arranged in an array on the black matrix; The total area of ​​the light-transmitting holes contained within each of the grids is equal; Each of the grids contains an equal number of light-transmitting holes.

4. The display panel according to claim 1, characterized in that, The spacing between two adjacent light-transmitting holes along the first direction is equal, and the spacing between two adjacent light-transmitting holes along the second direction is equal.

5. The display panel according to claim 1, characterized in that, The cross-section of the light-transmitting hole is circular, and the diameter of the light-transmitting hole is between 5μm and 15μm.

6. The display panel according to claim 1, characterized in that, The cross-section of the light-transmitting hole can be any of an ellipse, polygon, or irregular shape, and the diameter of the circumscribed circle of the light-transmitting hole is between 5 μm and 20 μm.

7. The display panel according to any one of claims 1-6, characterized in that, The distance between two adjacent light-transmitting holes is less than or equal to 100 μm.

8. The display panel according to any one of claims 1-6, characterized in that, The light-emitting structure includes a first electrode layer, a light-emitting material layer, and a second electrode layer sequentially disposed above the substrate. The light-emitting material layer includes red light-emitting material units that are excited to emit red light, green light-emitting material units that are excited to emit green light, and / or blue light-emitting material units that are excited to emit blue light. The red light-emitting material units correspond to the red filter units, the green light-emitting material units correspond to the green filter units, and the blue light-emitting material units correspond to the blue filter units. The pixel-defining material units are disposed on the light-emitting material layer between each light-emitting material unit.

9. The display panel according to claim 8, characterized in that, The light-emitting structure also includes a metal trace disposed below the first electrode layer, the metal trace being disposed outside the light path range formed by the light-transmitting hole and the light-transmitting hole.

10. An electronic device, characterized in that, It includes a display panel and an optical recognition module under the display panel, wherein the display panel is the display panel according to any one of claims 1-9.

11. The electronic device according to claim 10, characterized in that, The distance L between two adjacent light-transmitting holes along the first direction on the display panel satisfies: L≤M / N; Where M is the width of the object surface region corresponding to the optical recognition module along the first direction; N is the resolution of the imaging image acquired by the optical recognition module in the first direction; Alternatively, the distance L between two adjacent light-transmitting holes on the display panel along the first direction satisfies: L≤A*M / H; Wherein, A is the number of photosensitive pixel units corresponding to one image pixel in the first direction, and H is the number of photosensitive pixel units of the optical recognition module in the first direction.

12. The electronic device according to claim 10 or 11, characterized in that, The display panel also includes a light-transmitting hole on the pixel definition material unit that corresponds to the light-transmitting hole. The optical recognition module includes a light path guiding layer and multiple photosensitive pixel units. Multiple light channels are formed on the light path guiding layer. A corresponding set of light-transmitting holes and light-transmitting holes corresponds to one of the light channels in the optical recognition module.

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