Electronic device for fingerprint recognition

Abstract

The embodiment of the application belongs to the technical field of display devices, and particularly relates to an electronic device. The embodiment of the application aims to solve the problem of a large volume of a fingerprint sensor. The electronic device provided by the embodiment can include a light-transmitting structure for light to pass through in the identification area of the display panel, and a lens assembly is arranged on the side of the display panel away from the light-out surface. The lens assembly can converge the light from the identification area so that the converged light irradiates on the fingerprint sensor. The lens assembly can make the image received by the fingerprint sensor be a reduced image, thereby reducing the area of the region for imaging of the fingerprint sensor. The fingerprint sensor can be designed to be smaller to reduce the volume of the fingerprint sensor, thereby facilitating miniaturization and light weight of the electronic device.

Description

Technical Field

[0001] This application relates to the field of display device technology, specifically to an electronic device. Background Technology

[0002] Electronic devices, such as mobile phones and tablets, generally include a display panel and a fingerprint sensor located on the side of the display panel away from the light-emitting surface. The display panel allows some light to pass through so that when the user's finger covers the recognition area, the fingerprint sensor can receive the light from the user's finger, thereby realizing fingerprint recognition.

[0003] However, in order to detect all fingers covering the display panel, the fingerprint sensor's projection on the display panel is designed to be relatively large, resulting in a large fingerprint sensor size. Summary of the Invention

[0004] This application provides an electronic device designed to address the issue of the large size of fingerprint sensors.

[0005] This application provides an electronic device including a display panel. The display panel includes a light-emitting surface facing the user, through which the user can view images displayed on the display panel. The display panel also includes a back surface disposed opposite to the light-emitting surface. The electronic device further includes a fingerprint recognition module, which includes a fingerprint sensor and a lens assembly. The fingerprint sensor is disposed on the side of the display panel opposite to the light-emitting surface. The display panel includes a recognition area, with the fingerprint sensor facing the recognition area. The recognition area includes a light-transmitting structure for light to pass through. Light from outside the light-emitting surface can pass through the light-transmitting structure and through the display panel, illuminating the fingerprint sensor for fingerprint recognition.

[0006] The lens assembly is positioned on the side of the display panel away from the light-emitting surface, between the fingerprint sensor and the display panel. The projection of the lens assembly onto the display panel covers the recognition area. The principal optical axis of the lens assembly is perpendicular to the display panel. The lens assembly directs light from the recognition area to the fingerprint sensor, and the light from the recognition area gradually approaches the principal optical axis as it propagates towards the fingerprint sensor, thus forming an image on the fingerprint sensor and creating a reduced image.

[0007] In some embodiments that may include the above-described embodiments, the lens assembly includes a lens body, which includes a light-incident surface facing the display panel and a light-exit surface facing away from the display panel. Light from the display panel enters the lens body through the light-incident surface and exits through the light-exit surface after passing through the lens body. The light-incident surface or the light-exit surface of the lens body is an outwardly convex curved surface, that is, the lens body is a convex lens, so as to achieve the effect of converging light and thus forming a reduced image on the fingerprint sensor.

[0008] In some embodiments that may include the above-described examples, both the light-incident surface and the light-exit surface of the lens body are outwardly convex curved surfaces. This configuration enhances the focusing effect on light, thereby reducing the thickness of the lens body while maintaining the same degree of image reduction, thus facilitating the miniaturization and weight reduction of electronic devices.

[0009] In some embodiments that may include the above embodiments, multiple light-transmitting structures disposed in the recognition area are arranged in an array within the recognition area. This arrangement ensures that the multiple light-transmitting structures are evenly distributed, which facilitates the manufacturing of the display panel.

[0010] In some embodiments that may include the above examples, the area in the light-emitting surface where the light-transmitting structure receives light is the field of view of that light-transmitting structure. Each light-transmitting structure on the light-emitting surface includes a corresponding field of view. External light corresponding to this field of view can enter the light-transmitting structure through the field of view and be detected by the light-transmitting structure, while external light outside the field of view will not enter the aperture. Along the row direction of the arrayed light-transmitting structures, the fields of view of adjacent light-transmitting structures partially overlap. With this arrangement, the fields of view are continuously arranged along the row direction, that is, there are no gaps between adjacent fields of view along the row direction, thereby enabling the acquisition of all fingerprint information of the user's finger along the row direction.

[0011] In some embodiments that may include the above examples, the fields of view of adjacent light-transmitting structures overlap along the column direction of the arrayed light-transmitting structures. The fields of view are arranged continuously along the column direction, meaning there are no gaps between adjacent fields of view along the column direction, allowing all fingerprint information of the user's finger to be acquired along the column direction. This configuration allows for the acquisition of all fingerprint information of the user's finger along both the row and column directions, thereby obtaining complete user fingerprint information and improving the accuracy of fingerprint recognition.

[0012] In some embodiments that may include the above embodiments, the distance between adjacent light-transmitting structures is equal along both the row and column directions, and the distance... Satisfy the following formula:

[0013]

[0014] in, Let be the field radius, satisfying:

[0015]

[0016] in, , The viewing angle is due to the light-transmitting structure. The thickness of the light-transmitting structure along the direction perpendicular to the display panel. The diameter of the light-transmitting structure, This is the distance between the light-transmitting structure and the incident light surface.

[0017] In some embodiments that may include the above embodiments, the imaging focal length of the lens body Distance between the lens body and the fingerprint sensor and the distance between the lens body and the light-emitting surface. Satisfy the following formula:

[0018] .

[0019] In some embodiments that may include the above embodiments, the display panel includes:

[0020] The pixel-defining layer has multiple pixel openings arranged in an array, and each pixel opening contains a light-emitting material layer; the pixel-defining layer also has multiple holes spaced apart, with each hole located between two adjacent pixel openings.

[0021] An array substrate is provided, which is stacked with a pixel defining layer. The array substrate includes a metal pattern layer, and the projection of the holes on the array substrate is located in the hollow area of ​​the metal pattern layer. The light-transmitting structure includes holes.

[0022] In some embodiments that may include the above embodiments, the display panel includes:

[0023] The color filter substrate has multiple light-transmitting openings arranged in an array on it, and a filter is disposed inside each light-transmitting opening; the color filter substrate also has multiple holes spaced apart, with each hole located between two adjacent light-transmitting openings.

[0024] The liquid crystal layer is stacked with a color filter substrate. The liquid crystal layer includes multiple hole structures, and the projection of each hole structure on the color filter substrate covers a hole.

[0025] An array substrate includes a metal pattern layer, and the projection of holes on the array substrate is located within the cutout area of ​​the metal pattern layer. The light-transmitting structure includes holes and a hole structure.

[0026] The electronic device provided in this application embodiment includes a light-transmitting structure in the recognition area of ​​the display panel for light to pass through. The lens assembly is disposed on the side of the display panel away from the light-emitting surface. The lens assembly can converge the light from the recognition area so that the converged light illuminates the fingerprint sensor. The lens assembly can make the image received by the fingerprint sensor a reduced image, thereby reducing the area of ​​the fingerprint sensor used for imaging. The fingerprint sensor can be designed to be smaller, thereby reducing the size of the fingerprint sensor and facilitating the miniaturization and weight reduction of the electronic device. Attached Figure Description

[0027] Figure 1 Schematic diagram of the structure of the electronic device provided in the embodiments of this application Figure 1 ;

[0028] Figure 2 A schematic diagram of the structure of an electronic device in related technologies. Figure 1 ;

[0029] Figure 3 Schematic diagram of the structure of the electronic device provided in the embodiments of this application Figure 2 ;

[0030] Figure 4 This application provides a schematic diagram of the structure of a display panel in an electronic device. Figure 1 ;

[0031] Figure 5 Top view of the array substrate in the electronic device provided in the embodiments of this application. Figure 1 ;

[0032] Figure 6 Top view of the array substrate in the electronic device provided in the embodiments of this application. Figure 2 ;

[0033] Figure 7 Schematic diagram of the structure of the display panel in the electronic device provided in the embodiments of this application Figure 2 ;

[0034] Figure 8 This application provides a projection view of a light-transmitting structure in an electronic device on a substrate for embodiments of the present application;

[0035] Figure 9 A schematic diagram of the structure of an electronic device in related technologies. Figure 2 ;

[0036] Figure 10 A schematic diagram of the structure of an electronic device in related technologies. Figure 3 ;

[0037] Figure 11 A schematic diagram of the structure of an electronic device in related technologies. Figure 4 ;

[0038] Figure 12 This application provides a schematic diagram of the structure of a display panel in an electronic device. Figure 3 ;

[0039] Figure 13 This application provides a distribution diagram of the field of view of a light-transmitting structure on the light-emitting surface for embodiments of the present application;

[0040] Figure 14 Schematic diagram of the structure of the electronic device provided in the embodiments of this application Figure 3 .

[0041] Explanation of reference numerals in the attached figures:

[0042] 1: Electronic devices;

[0043] 10: Electronic devices;

[0044] 20: fingers;

[0045] 30: Shell;

[0046] 100: Display panel;

[0047] 101: Light-transmitting structure;

[0048] 102: Field of view;

[0049] 110: Identification area;

[0050] 120: light-emitting surface;

[0051] 130: Back view;

[0052] 140: Emissive layer;

[0053] 141: Pixel-limited layer;

[0054] 142: Pixel aperture;

[0055] 143: Luminescent material layer;

[0056] 150: Array substrate;

[0057] 151: Base;

[0058] 152: Active layer;

[0059] 153: Gate;

[0060] 154: Source pole;

[0061] 155: Drain;

[0062] 156: Lower electrode plate;

[0063] 157: Upper electrode plate;

[0064] 160: Second electrode layer;

[0065] 170: Color filter substrate;

[0066] 171: Light-transmitting opening;

[0067] 172: Filter;

[0068] 180: Openwork area;

[0069] 181: Scan line;

[0070] 182: Grid line;

[0071] 190: Liquid crystal layer;

[0072] 200: Lens assembly;

[0073] 201: The surface receiving light;

[0074] 202: The surface that emits light;

[0075] 300: Fingerprint sensor;

[0076] 400: Microlens;

[0077] 500: Convex lens;

[0078] 600: Acoustic wave detector;

[0079] 700: Image sensor. Detailed Implementation

[0080] Please refer to Figure 1 Electronic devices such as mobile phones and tablets generally include a display panel 100, such as... Figure 2 As shown, the display panel 100 includes a light-emitting surface 120 for displaying images and a back surface 130 opposite to the light-emitting surface 120. The electronic device 10 also includes a fingerprint sensor 300, which is disposed facing the back surface 130. The display panel 100 includes, for example, a light-emitting surface 120 for displaying images and a back surface 130 opposite to the light-emitting surface 120. Figure 1 The identification area 110 shown is used for fingerprint detection. Specifically, the display panel 100 in the identification area 110 includes a plurality of spaced light-transmitting structures 101. The light-transmitting structures 101 allow light incident from the side where the light-emitting surface 120 of the display panel 100 is located to pass through and be emitted from the back side 130 of the display panel 100, and then be received by the fingerprint sensor 300.

[0081] The surface of the finger 20 includes raised and recessed structures, which together form a fingerprint pattern. Each person's fingerprint pattern is unique; that is, different people have different fingerprint patterns. During detection, the user brings their finger 20 close to the recognition area 110. The corresponding display panel 100 in the recognition area 110 emits light, which is reflected at the finger 20. The reflected light passes through the light-transmitting structure 101 and then through the display panel 100. The fingerprint sensor 300 then receives the light from the finger 20 to obtain an image of the fingerprint pattern, thus achieving fingerprint recognition.

[0082] However, the recognition area 110 is generally designed to be relatively large. In order to ensure that the entire surface of the finger 20 covering the recognition area 110 can be detected, the vertical projection of the fingerprint sensor 300 on the display panel 100 can cover the recognition area 110. This results in a large size of the fingerprint sensor 300, making it difficult to achieve miniaturization and weight reduction of the electronic device 1. In addition, the large size of the fingerprint sensor 300 also results in a smaller area of ​​the finger 20 recognized per unit volume of the fingerprint sensor 300, thus leading to a lower utilization rate of the fingerprint sensor 300.

[0083] To address this issue, this application provides an electronic device that uses a lens assembly positioned between a display panel and a fingerprint sensor to converge light from the display panel and form a reduced image on the fingerprint sensor. This reduces the area of ​​the fingerprint sensor that receives light, thereby reducing its size and facilitating miniaturization and weight reduction of the electronic device. Furthermore, the smaller fingerprint sensor increases the area of ​​the finger it can recognize per unit volume, thus improving the utilization rate of the fingerprint sensor.

[0084] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0085] like Figure 1 As shown, this application embodiment provides an electronic device 1, which may include mobile phones, tablet computers, smartwatches, etc., and this embodiment does not limit it.

[0086] Electronic device 1 includes a housing 30 and an electronic device 10 mounted on the housing 30. The electronic device 10 includes a display panel 100, which can be fixed to the housing 30. The display panel 100 can be a liquid crystal display (LCD), an organic light emitting diode (OLED), or the like, and this embodiment does not limit this.

[0087] Please refer to Figure 3The display panel 100 includes a light-emitting surface 120 facing the user, through which the user can view the image displayed on the display panel 100. The display panel 100 also includes a back surface 130 disposed opposite to the light-emitting surface 120. The electronic device 10 also includes a fingerprint recognition module, which includes a fingerprint sensor 300. The fingerprint sensor 300 is disposed on the side of the display panel 100 away from the light-emitting surface 120, that is, the fingerprint sensor 300 is disposed facing the back surface 130 of the display panel 100 and is at a certain distance from the back surface 130. The display panel 100 includes a recognition area 110, and the projection of the fingerprint sensor 300 on the display panel 100 covers the recognition area 110. The recognition area 110 includes a light-transmitting structure 101 for light to pass through. Light from outside the light-emitting surface 120 can pass through the light-transmitting structure 101 and pass through the display panel 100. The light passing through the display panel 100 illuminates the fingerprint sensor 300 to form an image on the fingerprint sensor 300 for fingerprint recognition.

[0088] Continue to refer to Figure 1 It is understandable that the recognition area 110 is used for fingerprint recognition, and the recognition area 110 can be located within the display area of ​​the display panel 100. For example... Figure 1 Taking the illustrated orientation as an example, the recognition area 110 can be located near the bottom of the display panel 100, so that when the user holds the electronic device 1, the finger 20, such as the thumb, can easily cover the recognition area 110 for convenient fingerprint detection. Furthermore, during detection, the user can still view the image on the display panel 100 through the upper area of ​​the display panel 100. Of course, in this embodiment, the recognition area 110 can also be located in other positions on the display panel 100; this embodiment is not limited in this respect.

[0089] Continue to refer to Figure 3 In the above implementation, the light-transmitting structure 101 is located within the recognition area 110. The light-transmitting structure 101 can achieve pinhole imaging. The light-transmitting structure 101 forms a path for light to pass through within the recognition area 110, that is, light from outside the light-emitting surface 120 can pass through the light-transmitting structure 101 through the display panel 100 and then be emitted from the back surface 130. This embodiment does not limit the light-transmitting structure 101, as long as the light-transmitting structure 101 can form a path for light to pass through the display panel 100, thereby achieving pinhole imaging.

[0090] The following is an example illustrating the specific composition of the light-transmitting structure 101:

[0091] Please refer to Figure 4In the implementation of the display panel 100 as an OLED display panel, the display panel 100 includes an array substrate 150 and a light-emitting layer 140 stacked together. The light-emitting layer 140 includes a pixel defining layer 141, on which a plurality of pixel openings 142 are arrayed. A light-emitting material layer 143 is disposed within each pixel opening 142. A first electrode layer is stacked on the side of the pixel defining layer 141 away from the array substrate 150, and a second electrode layer 160 is stacked on the side of the pixel defining layer 141 close to the array substrate 150. The light-emitting material layer 143 is located between the first electrode layer and the second electrode layer 160. The first electrode layer can be a single layer, and there are multiple second electrode layers 160. The projection of each second electrode layer 160 onto the pixel defining layer 141 covers one pixel opening 142. Furthermore, the array substrate 150 includes a substrate 151 and a plurality of pixel circuits arrayed on the substrate 151. The aforementioned display panel 100 includes a plurality of pixels, each pixel having a pixel circuit and a second electrode layer 160 electrically connected to the pixel circuit, so that the corresponding second electrode layer 160 is energized by the pixel circuit, thereby forming a voltage difference between the second electrode layer 160 and the first electrode layer, thereby causing the light-emitting material layer 143 corresponding to the second electrode layer 160 to emit light.

[0092] The pixel circuit includes multiple thin-film transistors 158 (TFTs) and capacitor structures 159. This application embodiment does not limit the number of TFTs 158 and capacitor structures 159; for example, the pixel circuit can be 2TFTs, 7TFTs, etc. At least one TFT 158 in the pixel circuit is electrically connected to a second electrode layer 160, and each second electrode layer 160 corresponds to a pixel opening 142. The TFT 158 is used to transmit electrical signals to the second electrode layer 160 to form a voltage between the second electrode layer 160 and the first electrode layer, thereby driving the light-emitting material layer 143 in the pixel opening 142 corresponding to the second electrode layer 160 to emit light.

[0093] Continue to refer to Figure 4The array substrate 150 includes a substrate 151 and an active layer 152, a first metal layer M1, a second metal layer M2 and a third metal layer M3 stacked on the substrate 151. Interlayer dielectric layers are disposed between the active layer 152 and the first metal layer M1, between the first metal layer M1 and the second metal layer M2, and between the second metal layer M2 and the third metal layer M3. The thin-film transistor 158 includes an active layer 152, a gate 153, a source 154, and a drain 155. The gate 153 and the lower electrode 156 of the capacitor structure 159 can be disposed in the first metal layer M1, that is, the gate 153 and the lower electrode 156 are formed after etching the first metal layer M1. The source 154 and the drain 155 can be disposed in the third metal layer M3, that is, the source 154 and the drain 155 are formed after etching the third metal layer M3. The upper electrode 157 of the capacitor structure 159 can be disposed in the second metal layer M2, that is, the upper electrode 157 is formed after etching the second metal layer M2.

[0094] Please refer to Figure 5 Furthermore, the array substrate 150 also includes a scan line 181 (data line, abbreviated as DL) and a gate line 182 (get line, abbreviated as GL) electrically connected to the thin-film transistor 158 in the pixel circuit. The scan line 181 can be disposed on the first metal layer M1, or the second metal layer M2, or the third metal layer M3. Similarly, the gate line 182 can also be disposed on the first metal layer M1, or the second metal layer M2, or the third metal layer M3. It is worth noting that the scan line 181 and the gate line 182 need to be located on different film layers to avoid excessive line density in a single metal layer.

[0095] Continue to refer to Figure 4 In the above implementation, the pixel defining layer 141 can be an opaque film layer to prevent crosstalk between light emitted from the light-emitting material layers 143 in adjacent pixel openings 142. Multiple holes are spaced apart on the pixel defining layer 141, with each hole positioned between adjacent pixel openings 142. The first metal layer M1, the second metal layer M2, and the third metal layer M3 in the array substrate 150 are metal pattern layers within the array substrate 150, and the metal pattern layers have the following characteristics: Figure 5 The cutout area 180 shown is the region not covered by the first metal layer M1, the second metal layer M2, and the third metal layer M3 in the projection onto the substrate 151. The projection of the holes onto the array substrate 150 lies within the cutout area 180; that is, in the projection onto the substrate 151, the first metal layer M1, the second metal layer M2, and the third metal layer M3 do not cover the holes. Thus, the holes and the cutout area 180 of the metal pattern layer constitute... Figure 5The light-transmitting structure 101 shown allows light outside the light-emitting surface 120 to pass through the hole and then through the array substrate 150, and then be emitted from the back side 130 of the display panel 100.

[0096] As can be seen from the above, the display panel 100 includes horizontally and vertically intersecting scan lines 181 and gate lines 182, and pixel circuits electrically connected to the scan lines 181 and gate lines 182. The pixel circuits include thin-film transistors 158 and capacitor structures 159. In order for the hole to avoid the first metal layer M1, the second metal layer M2, and the third metal layer M3, the projection of the hole on the substrate 151 can be non-overlapping with the projections of the scan lines 181, the gate lines 182, the thin-film transistors 158, and the capacitor structures 159.

[0097] In other implementations, multiple holes are spaced apart on the pixel limiting layer 141, and the holes are located outside the pixel opening 142, such as... Figure 6 The projection of the hole onto the substrate 151 partially overlaps with the projections of the first metal layer M1, and / or the second metal layer M2, and / or the third metal layer M3 onto the substrate 151. The metal layers can block a portion of the light from the hole from passing through, while the remaining light can pass through the array substrate 150 and exit from the back surface 130 of the display panel 100, thus forming a light-transmitting structure 101. In other words, the projections of the first metal layer, the second metal layer M2, and the third metal layer M3 onto the substrate 151 only partially cover the hole, thus forming a light-transmitting structure 101. Figure 6 The light-transmitting structure 101 shown.

[0098] Continue to refer to Figure 4 In the above implementation, the display panel 100 further includes a color filter substrate 170 located on the side of the light-emitting layer 140 opposite to the array substrate 150. The color filter substrate 170 has a plurality of light-transmitting openings 171 arrayed on it. The projection of each light-transmitting opening 171 onto the pixel limiting layer 141 covers a pixel opening 142. A filter 172 is disposed within each light-transmitting opening 171, filtering the light from the pixel opening 142 to achieve color display. The pixel limiting layer 141 can be a light-transmitting film layer; correspondingly, the color filter substrate 170 needs to be an opaque film layer to avoid crosstalk between adjacent light-transmitting openings 171. It is understood that, in this case, holes need to be disposed on the color filter substrate 170 and located between adjacent light-transmitting openings 171.

[0099] Please refer to Figure 7In the implementation of the display panel 100 as an LCD display panel, the display panel 100 includes an array substrate 150, a liquid crystal layer 190, and a color filter substrate 170 stacked together. The liquid crystal layer 190 is located between the array substrate 150 and the color filter substrate 170. A first electrode layer is disposed on the side of the liquid crystal layer 190 away from the array substrate 150, and a plurality of second electrode layers 160 are arrayed on the side of the liquid crystal layer 190 close to the array substrate 150. The array substrate 150 includes a pixel circuit, which includes a plurality of thin film transistors 158 and a capacitor structure 159. One thin film transistor 158 is electrically connected to one second electrode layer 160. The thin film transistor 158 is used to transmit electrical signals to the second electrode layer 160 to form a voltage between the second electrode layer 160 and the first electrode layer, thereby causing the liquid crystal molecules between the second electrode layer 160 and the first electrode layer to deflect, so as to control the light transmittance between the second electrode layer 160 and the first electrode layer.

[0100] The color filter substrate 170 has multiple light-transmitting openings 171. The projection of each light-transmitting opening 171 onto the array substrate 150 overlaps the projection of a second electrode layer 160 onto the array substrate 150. Each light-transmitting opening 171 contains a filter 172. When the liquid crystal molecules between the second electrode layer 160 and the first electrode layer are deflected to allow light to pass through, the light is emitted through the filter 172, thereby enabling color display.

[0101] The array substrate 150 is structurally similar to the array substrate 150 in an OLED display panel, and will not be described in detail here. To prevent light from interfering with each other in adjacent light-transmitting holes 171, the color filter substrate 170 needs to be an opaque film layer. Accordingly, multiple holes are formed on the color filter substrate 170, with each hole located between adjacent light-transmitting holes 171. The first metal layer M1, the second metal layer M2, and the third metal layer M3 in the array substrate 150 are metal pattern layers within the array substrate 150. The metal pattern layers have a cutout area 180, which is the area not covered by the first metal layer M1, the second metal layer M2, and the third metal layer M3 in the projection onto the substrate 151. The projection of the holes on the array substrate 150 is located within the cutout area 180, meaning that the first metal layer M1, the second metal layer M2, and the third metal layer M3 do not cover the holes in the projection onto the substrate 151. Thus, the holes and the hollowed-out area 180 of the metal pattern layer form a light-transmitting structure 101, so that light outside the light-emitting surface 120 can pass through the holes and then through the array substrate 150, and then be emitted from the back side 130 of the display panel 100.

[0102] Furthermore, such as Figure 5As shown, the display panel 100 includes horizontally and vertically intersecting scan lines 181 and gate lines 182, and pixel circuits electrically connected to the scan lines 181 and gate lines 182. The pixel circuits include thin-film transistors 158 and capacitor structures 159. In order for the hole to avoid the first metal layer M1, the second metal layer M2, and the third metal layer M3, the projection of the hole on the substrate 151 can be non-coincident with the projections of the scan lines 181, the gate lines 182, the thin-film transistors 158, and the capacitor structures 159.

[0103] In other implementations, multiple holes are spaced apart on the pixel limiting layer 141, and the holes are located outside the pixel opening 142, such as... Figure 6 The projection of the hole onto the substrate 151 partially overlaps with the projections of the first metal layer M1, and / or the second metal layer M2, and / or the third metal layer M3 onto the substrate 151. The metal layers can block a portion of the light from the hole from passing through, while the remaining light can pass through the array substrate 150 and then exit from the back surface 130 of the display panel 100 to form a light-transmitting structure 101. In other words, the projections of the first metal layer, the second metal layer M2, and the third metal layer M3 onto the substrate 151 only cover part of the hole, thus forming the light-transmitting structure 101.

[0104] It is worth noting that, in order to allow light reflected from the finger to pass through the liquid crystal layer 190, the light-transmitting structure 101 may further include a plurality of hole structures disposed on the liquid crystal layer 190, each hole structure projecting onto the color filter substrate 170 to cover a hole. For example, the hole structure may be a through-hole disposed on the liquid crystal layer, and further, the through-hole may be filled with a light-transmitting material. Of course, the hole structure may also be a path for light to pass through formed by the deflection of liquid crystal molecules in a portion of the liquid crystal layer. This embodiment does not limit the hole structure.

[0105] In this embodiment, the projection shape of the light-transmitting structure 101 on the substrate 151 can be as follows: Figure 8 The shapes shown are circular, rectangular, etc. Of course, the projection shape of the light-transmitting structure 101 on the substrate can also be other irregular shapes. This embodiment uses a circular projection of the light-transmitting structure 101 on the substrate as an example, but this embodiment is not limited to this.

[0106] Continue to refer to Figure 3The fingerprint recognition module also includes a lens assembly 200, which is disposed on the side of the display panel 100 opposite to the light-emitting surface 120, that is, facing the back surface 130 of the display panel 100, and located between the fingerprint sensor 300 and the display panel 100. The projection of the lens assembly 200 onto the display panel 100 covers the recognition area 110, allowing the lens assembly 200 to receive light from the recognition area 110. The principal optical axis of the lens assembly 200 is perpendicular to the display panel 100. The lens assembly 200 directs the light from the recognition area 110 to the fingerprint sensor 300, and the light from the recognition area 110 gradually approaches the principal optical axis as it propagates towards the fingerprint sensor 300, converging the light from the light-transmitting structure 101 onto the fingerprint sensor 300, thereby forming an image on the fingerprint sensor 300, and this image is a reduced image.

[0107] In this embodiment, the lens assembly 200 may include a lens body 210. The lens body 210 includes a light-incident surface 201 facing the display panel 100 and a light-exiting surface 202 facing away from the display panel 100. Light from the display panel 100 enters the lens body 210 through the light-incident surface 201 and exits through the light-exiting surface 202 after passing through the lens body 210.

[0108] In some implementations, the light-incident surface 201 or the light-exit surface 202 of the lens body 210 is an outwardly convex curved surface, that is, the lens body 210 is a convex lens, so as to achieve the effect of converging light and thus forming a reduced image on the fingerprint sensor 300.

[0109] In other implementation methods, such as Figure 3 As shown, both the light-incident surface 201 and the light-exit surface 202 of the lens body 210 are outwardly convex curved surfaces. This design enhances the converging effect of light, thereby allowing for a reduction in the thickness of the lens body 210 while maintaining the same degree of image reduction. This facilitates the achievement of... Figure 1 The miniaturization and weight reduction of the electronic device 1 shown.

[0110] It is understandable that by reasonably setting the focal length of the lens body 210, the distance between the lens body 210 and the display panel 100, and the distance between the lens body 210 and the fingerprint sensor 300, the image on the fingerprint sensor 300 can be reduced to a smaller image.

[0111] In this embodiment, the lens assembly 200 may further include a fixing structure, and the lens body 210 may be disposed on the fixing structure. The fixing structure may be connected to... Figure 1 The housing 30 shown is connected to fix the lens body 210; or the fixing structure is connected to the display panel 100, which can also fix the lens body 210.

[0112] The fingerprint sensor 300 in the electronic device 10 provided in this embodiment is disposed on the side of the lens assembly 200 opposite to the display panel 100. The fingerprint sensor 300 can receive light from the lens assembly 200 and detect the information carried in the light to achieve fingerprint recognition. It is understood that this embodiment does not limit the fingerprint sensor 300, as long as it can obtain the user's fingerprint information through light from the recognition area 110. For example, the fingerprint sensor 300 can be an image sensor, such as a CCD image sensor, a CMOS image sensor, etc.

[0113] Continue to refer to Figure 3 In this embodiment, the electronic device 10 performs fingerprint recognition as follows: the user brings their finger 20 close to the recognition area 110 of the display panel 100, the recognition area 110 emits light, and the light shines on the finger 20. After the light is reflected on the finger 20, it forms reflected light carrying fingerprint information. The reflected light passes through the light-transmitting structure 101 through the display panel 100, and is then guided by the lens assembly 200 to the fingerprint sensor 300. The fingerprint sensor 300 receives the reflected light to form an image on the fingerprint sensor 300, thereby obtaining the fingerprint information carried in the reflected light to achieve fingerprint recognition.

[0114] The electronic device 10 provided in this application embodiment includes a light-transmitting structure 101 for light to pass through in the recognition area 110 of the display panel 100. A lens assembly 200 is disposed on the side of the display panel 100 opposite to the light-emitting surface 120. The lens assembly 200 can converge the light from the recognition area 110 so that the converged light illuminates the fingerprint sensor 300. The lens assembly 200 can make the image received by the fingerprint sensor 300 a reduced image, thereby reducing the area of ​​the fingerprint sensor 300 used for imaging. This allows the fingerprint sensor 300 to be designed smaller, reducing its volume and facilitating the implementation of... Figure 1 The illustrated electronic device 1 is miniaturized and lightweight. Furthermore, the smaller size of the fingerprint sensor 300 also improves its utilization rate.

[0115] For related technology 1, please refer to... Figure 9The electronic device 10 includes a display panel 100 and an image sensor 700. The image sensor 700 is disposed on the side of the display panel 100 opposite to the light-emitting surface. The display panel 100 includes a recognition area, and each film layer of the recognition area has a certain light transmittance, for example, greater than 1%. The projection of the image sensor 700 onto the display panel 100 covers the recognition area. The electronic device 10 also includes a plurality of microlenses 400 spaced apart on the side of the image sensor 700 facing the display panel 100. The microlenses 400 can focus the light from the recognition area 110 onto the image sensor 700. During fingerprint recognition, the user brings their finger 20 close to the recognition area. The recognition area emits light, which is reflected at the finger 20. This reflected light carries fingerprint information. After passing through the display panel 100, the reflected light is focused onto the image sensor 700 by the microlenses 400. After receiving the light, the image sensor 700 can acquire the fingerprint information to achieve fingerprint recognition.

[0116] Please refer to Figure 10 The difference between related technology two and related technology one is that a convex lens 500 is provided between the image sensor 700 and the display panel 100 to focus the light from the recognition area 110 onto the image sensor 700, thereby achieving fingerprint recognition. Please refer to... Figure 3 Compared with related technologies one and two, in the embodiments of this application, the recognition area 110 of the display panel 100 includes a light-transmitting structure 101, which does not require each film layer of the recognition area 110 to have a certain light transmittance. The light transmittance can be less than 1%, or each film layer can be opaque. This can be applied to display panels 100 with low light transmittance or opacity.

[0117] For related technology three, please refer to... Figure 11 The electronic device 10 includes a display panel 100 and an acoustic wave detector 600. The acoustic wave detector 600 is disposed on the side of the display panel 100 opposite to the light-emitting surface and is attached to the display panel 100. The display panel 100 includes a recognition area, and the projection of the acoustic wave detector 600 onto the display panel 100 covers the recognition area. During fingerprint recognition, the user places their finger 20 on the recognition area, and the acoustic wave detector 600 emits sound waves (which can be ultrasonic waves) towards the finger 20. These sound waves are reflected at the user's finger 20 to form reflected sound waves carrying fingerprint information. The acoustic wave detector 600 receives these reflected sound waves, thereby achieving fingerprint recognition. However, attaching the acoustic wave detector 600 to the display panel 100 can easily damage the display panel 100, increasing wear and tear during assembly and resulting in higher production costs. In contrast, as... Figure 3As shown, in this embodiment of the application, the electronic device 10, lens assembly 200 and fingerprint sensor 300 do not contact the display panel 100. Therefore, the display panel 100 will not be damaged during the assembly process, reducing the loss during assembly and lowering the production cost.

[0118] In other related technologies, a touch circuit is incorporated into the display panel. When a user's finger touches the display panel, a capacitance is formed between the user's finger and the corresponding touch circuit, causing a change in the current of the touch circuit. This change in current allows for the detection of the user's touch on the display panel. During fingerprint recognition, the user's finger touches the display panel. Fingerprints include both raised and recessed structures. The different capacitances between these raised and recessed structures and the touch circuit create a current difference, thus enabling fingerprint recognition. However, the recognition accuracy of touch circuits is typically in the hundreds of micrometers, for example, less than 400 μm, while fingerprint recognition requires an accuracy of less than tens of micrometers. Therefore, fingerprint recognition using touch circuits leads to insufficient accuracy, especially at high resolutions, such as less than 300 ppi, where the inaccuracy is particularly noticeable. Figure 3 As shown, in this embodiment, the electronic device 10 has a light-transmitting structure 101 in the recognition area 110 of the display panel 100, which allows light to pass through. The lens assembly 200 is disposed on the side of the display panel 100 away from the light-emitting surface 120, so as to form a reduced image on the fingerprint sensor 300. This can be applied to the high-resolution display panel 100, improving the accuracy of fingerprint recognition.

[0119] Continue to refer to Figure 8 In this embodiment, it is set as follows: Figure 1 The multiple light-transmitting structures 101 in the identification area 110 shown are arranged in an array within the identification area 110. This arrangement ensures that the multiple light-transmitting structures 101 are evenly distributed, which facilitates the fabrication of the display panel 100.

[0120] Please refer to Figure 12 It is understood that the display panel 100 includes a light-emitting surface 120 and a back surface 130 disposed opposite to each other, wherein a user can view the image displayed on the display panel 100 through the light-emitting surface 120, and the back surface 130 is the area where the display panel 100 faces. Figure 1 The interior of the housing 30 shown is on one side. The area in the light-emitting surface 120 where the light-transmitting structure 101 receives light is as shown in the image. Figure 13 The field of view 102 shown means that each light-transmitting structure 101 includes a corresponding field of view 102 on the light-emitting surface 120. External light corresponding to the field of view 102 can enter the light-transmitting structure 101 through the field of view 102 and then pass through the display panel 100, while external light outside the field of view 102 will not enter the light-transmitting structure 101.

[0121] In the above implementation, along the direction of the rows in the array of light-transmitting structures 101, i.e. Figure 13 In the X direction, the fields of view 102 corresponding to adjacent light-transmitting structures 101 partially overlap. With this arrangement, the fields of view 102 are continuously arranged along the row direction, that is, there are no gaps between adjacent fields of view 102 along the row direction, thereby enabling all fingerprint information of the user's finger 20 to be acquired along the row direction.

[0122] Furthermore, along the direction of the columns in the array of light-transmitting structures 101, i.e. Figure 13 In the Y direction, the fields of view 102 corresponding to adjacent light-transmitting structures 101 partially overlap. The fields of view 102 are arranged continuously along the column direction, meaning there are no gaps between adjacent fields of view 102 along the column direction. This allows for the acquisition of all fingerprint information of the user's finger 20 along both the row and column directions, thus obtaining complete user fingerprint information and improving the accuracy of fingerprint recognition.

[0123] It is worth noting that, since the fields of view 102 corresponding to adjacent light-transmitting structures 101 overlap along the row and column directions, the overlapping fields of view 102 will repeatedly acquire user fingerprint information. Therefore, after the fingerprint sensor 300 acquires the fingerprint images corresponding to each field of view 102, it is necessary to perform image stitching to stitch together the fingerprint information corresponding to each field of view 102 and remove duplicate fingerprint information in order to obtain complete fingerprint information.

[0124] In the above implementation, the area of ​​the overlapping portion in the field of view 102 corresponding to adjacent light-transmitting structures 101 can be 5%-30% of the area of ​​one of the field of view 102, for example: 5%, 10%, 20%, 30%, etc. In this way, while ensuring the acquisition of complete fingerprint information, the overlap rate of the field of view 102 corresponding to adjacent light-transmitting structures 101 is avoided to the extent that it is too large, thereby avoiding interference between the images formed by adjacent light-transmitting structures 101.

[0125] Continue to refer to Figure 12 In this embodiment, the distance Z between adjacent light-transmitting structures 101 is equal along both the row and column directions, and this distance... Satisfy the following formula:

[0126]

[0127] in, Figure 13 shown Let the radius of the field of view be 102, satisfying:

[0128]

[0129] in, , The field of view (FOV) of the light-transmitting structure 101. The thickness of the light-transmitting structure 101 along the direction perpendicular to the display panel 100 is, for example... Figure 4 As shown, in the implementation where a light-transmitting structure 101 is formed between the pixel limiting layer 141 and the metal layer in the array substrate 150, The distance between pixel-defined layer 141 and the corresponding metal layer. The diameter of the light-transmitting structure 101 The distance between the light-transmitting structure 101 and the light-emitting surface 120 is, as shown below. Figure 4 The distance between the pixel-defined layer 141 and the finger 20 is shown.

[0130] This configuration allows for a sufficiently large overlap of the fields of view 102 of adjacent light-transmitting structures 101, ensuring that a complete image can be obtained after image stitching, thereby obtaining complete fingerprint information and improving the accuracy of fingerprint recognition.

[0131] In the above implementation method, It can range from 300μm to 2000μm, and correspondingly, The range is 10μm-200μm. It ranges from 1 to 20 μm. For example, in... At 700μm, It is 25μm. It is 8μm.

[0132] It is understandable that, since the pixels in the display panel 100 are distributed in an array, they have a certain periodicity k, meaning the pixel spacing is k. Therefore... While satisfying the above formula, it can also be a multiple of k, and correspondingly, It can be k, 2k, 3k, etc. For example, when the pixel pitch of the display panel 100 is 55μm, Under the condition of satisfying the above formula, 55μm, 110μm, 220μm, etc. can be selected. In this way, the number of pixels between adjacent light-transmitting structures 101 can be the same, so that the light-transmitting structures 101 are evenly distributed.

[0133] Please refer to Figure 14 In this embodiment, based on the imaging principle of a convex lens, the imaging focal length of the lens body 210 is... The distance between the lens body 210 and the fingerprint sensor 300 and the distance between the lens body 210 and the light-transmitting structure 101. Satisfy the following formula:

[0134] .

[0135] With the above settings, a smaller image can be formed on the fingerprint sensor 300, thereby reducing the size of the fingerprint sensor 300 and facilitating the miniaturization and weight reduction of electronic devices.

[0136] It is understandable that the imaging focal length of the lens body 210 should be set appropriately. The distance between the lens body 210 and the fingerprint sensor 300 and the distance between the lens body 210 and the light-transmitting structure 101. The size of the user's finger 20 is the image size of that fingerprint formed on the fingerprint sensor 300. The effective scaling ratio of the fingerprint recognition module is 10 times. For example, the effective scaling ratio It can be 1-10, and further... The value can be 3-6, such as 3, 4, 5, 6, etc. This setting can avoid image distortion caused by excessive scaling ratio, and can also reduce the design and manufacturing difficulty of the lens structure.

[0137] In the above implementation, the distance between the light-transmitting structure 101 and the fingerprint sensor 300 , It can be 0.1 mm - 10 mm. Furthermore, It can be 3 mm - 5 mm, such as 3 mm, 4 mm, 5 mm, etc. The diameter of the lens body... The thickness ranges from 1mm to 10mm, for example, 1mm, 5mm, 10mm, etc. When the width is 5mm, it can be used in the recognition area 110 for acquiring fingerprint images. The display panel 100.

[0138] Understandably, given a fixed effective scaling ratio, it is important to reasonably set the imaging focal length of the lens body 210. The distance between the light-transmitting structure 101 and the fingerprint sensor 300 can be adjusted. This matches the thickness of the electronic device 10. In this embodiment, the imaging focal length... The distance can be 1mm-20mm, for example: 1mm, 10mm, 20mm, etc., which can avoid the distance between the light-transmitting structure 101 and the fingerprint sensor 300. Too large or too small, even if the thickness of the entire display panel is moderate.

[0139] In the above implementation method, It can be ,in The distance between the light-transmitting structure 101 and the user's finger 20 is such that the utilization rate of the fingerprint sensor 300 and the overlap rate of the images formed by adjacent light-transmitting structures 101 can be balanced. Under the premise that the fingerprint sensor 300 has a high utilization rate, the overlap rate of the images formed by adjacent light-transmitting structures 101 can be avoided to prevent excessive overlap, thereby avoiding interference between the images formed by adjacent light-transmitting structures 101.

[0140] It should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection or an integral connection; they can also refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; or 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 the embodiments of this application according to the specific circumstances.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electronic device for fingerprint recognition, characterized in that, include: The display panel includes a recognition area, which includes multiple light-transmitting structures that are spaced apart. The light-transmitting structure is used for pinhole imaging; A fingerprint recognition module, including a fingerprint sensor and a lens assembly; The fingerprint sensor is disposed on the side of the display panel away from the light-emitting surface, and the projection of the fingerprint sensor on the display panel is located within the recognition area; The lens assembly is disposed between the display panel and the fingerprint sensor. The projection of the lens assembly on the display panel covers the recognition area. The main optical axis of the lens assembly is perpendicular to the display panel. The lens assembly is used to converge light from the light-transmitting structure to the fingerprint sensor. The multiple light-transmitting structures are arranged in an array within the recognition area; The area in the light-emitting surface where the light-transmitting structure is used to receive light is the field of view of the light-transmitting structure. Along the direction of travel, the field of view portions corresponding to adjacent light-transmitting structures overlap; Along the column direction, the field of view portions corresponding to adjacent light-transmitting structures overlap. Along both the row and column directions, the distance between adjacent light-transmitting structures is equal, and the distance... Satisfy the following formula: in, Let the field of view radius be such that: in, , The viewing angle of the light-transmitting structure. The thickness of the light-transmitting structure along the direction perpendicular to the display panel is [thickness value missing]. The diameter of the light-transmitting structure is [missing information]. The distance between the light-transmitting structure and the light-emitting surface is denoted as .

2. The electronic device according to claim 1, characterized in that, The lens assembly includes: The lens body includes a light-incident surface facing the display panel and a light-exit surface facing away from the display panel, wherein the light-incident surface is an outwardly convex curved surface.

3. The electronic device according to claim 2, characterized in that, The light-emitting surface is an outwardly convex curved surface.

4. The electronic device according to claim 3, characterized in that, The imaging focal length of the lens body The distance between the lens body and the fingerprint sensor and the distance between the lens body and the light-transmitting structure. Satisfy the following formula: 。 5. The electronic device according to claim 1, characterized in that, The display panel includes: A pixel defining layer is provided with a plurality of pixel openings arranged in an array on the pixel defining layer, and a light-emitting material layer is provided in each pixel opening; the pixel defining layer is also provided with a plurality of holes at intervals, and each hole is located between two adjacent pixel openings; An array substrate is provided, wherein the array substrate and the pixel defining layer are stacked together, the array substrate includes a metal pattern layer, and the projection of the hole on the array substrate is located within the hollow area of ​​the metal pattern layer; the light-transmitting structure includes the hole.

6. The electronic device according to claim 1, characterized in that, The display panel includes: A color filter substrate, wherein a plurality of light-transmitting openings are arranged in an array on the color filter substrate, and a filter is disposed in the light-transmitting opening; a plurality of holes are arranged at intervals on the color filter substrate, and each hole is located between two adjacent light-transmitting openings; A liquid crystal layer is stacked with the color filter substrate. The liquid crystal layer includes a plurality of hole structures, and the projection of each hole structure on the color filter substrate covers one hole. An array substrate, the array substrate including a metal pattern layer, the projection of the hole on the array substrate being located within the hollow area of ​​the metal pattern layer, and the light-transmitting structure including the hole and the hole structure.

Images