Under-screen optical fingerprint module and fingerprint identification mobile terminal

Abstract

The application provides an under-screen optical fingerprint module and a fingerprint identification mobile terminal, and relates to the technical field of fingerprint identification. Compared with the prior art, the under-screen optical fingerprint module is integrated with the fixed lens barrel, and the structure is simple, the problems of complex structure, high process difficulty and multiple processes of the original focusing scheme are solved, and the focusing mode and the clearest state of the captured image can be better realized, so that the identification capability of the fingerprint and the security of the security unlocking are better improved.

Description

Technical Field

[0001] The present invention relates to the field of fingerprint recognition technology, and in particular to an under-screen optical fingerprint module and a fingerprint recognition mobile terminal. Background Art

[0002] As mobile phone unlocking methods continue to evolve, from initial digital passwords and patterns to fingerprints, faces, and irises, biometric unlocking methods are constantly changing. With continuous technological breakthroughs, the convenience and security of mobile phone unlocking are also greatly improved. Currently, the most popular under-screen fingerprint recognition is also constantly being updated. Under-screen fingerprint recognition is mainly optical, and optical fingerprint recognition mode is gradually becoming the dominant under-screen fingerprint recognition mode. Optical fingerprint recognition is divided into integrated, separate, and focus-adjustable types. Currently, the focus-adjustable type has not seen significant improvement in actual application. In addition, existing focus-adjustable solutions are complex in structure, difficult to manufacture, and have multiple steps, resulting in low production yield and lack of mass production capabilities.

[0003] In view of this, it is particularly important to design and manufacture an under-screen optical fingerprint module with a simple structure and low process difficulty, which can better realize the focus mode, capture the clearest image, and better improve the fingerprint recognition ability and the security of secure unlocking. Summary of the Invention

[0004] The purpose of the present invention is to provide an under-screen optical fingerprint module with a simple structure and low process difficulty. At the same time, it can better achieve focusing, capture the clearest image state, and better improve the fingerprint recognition ability and the security of secure unlocking.

[0005] Another object of the present invention is to provide a fingerprint recognition mobile terminal with good fingerprint recognition effect and high security of secure unlocking.

[0006] The present invention is achieved by adopting the following technical solutions.

[0007] On the one hand, the present invention provides an under-screen optical fingerprint module, including a fixed lens barrel, a movable lens group, a movable controller and a fingerprint chip attached to a mainboard. The movable lens group is movably assembled in the fixed lens barrel, the fixed lens barrel is arranged around the fingerprint chip, and the movable lens group is arranged above the fingerprint chip. The movable controller is arranged in the fixed lens barrel and is transmission-connected to the movable lens group to drive the movable lens group to move relative to the fingerprint chip.

[0008] Furthermore, the moving controller is arranged on at least one side of the moving lens group, and is used to drive the moving lens group to perform linear motion in a direction parallel to the photosensitive surface of the fingerprint chip.

[0009] Furthermore, the movable lens group includes a first lens and a second lens arranged in parallel, and the first lens and the second lens are both located on the light-sensitive path of the fingerprint chip. A movable controller is provided on both sides of the first lens and both sides of the second lens, and the movable controller is used to respectively drive the first lens and the second lens to move in a direction parallel to the light-sensitive surface of the fingerprint chip.

[0010] Furthermore, both the first lens and the second lens are concave lenses.

[0011] Furthermore, the moving controller is arranged on at least one side of the moving lens group, and is used to drive the moving lens group to perform linear motion in a direction perpendicular to the photosensitive surface of the fingerprint chip.

[0012] Furthermore, the movable lens group includes a third lens, which is located on the photosensitive path of the fingerprint chip, and a movable controller is provided on both sides of the third lens. The movable controller is connected to the third lens and is used to drive the third lens to move in a direction perpendicular to the photosensitive surface of the fingerprint chip to approach or move away from the fingerprint chip.

[0013] Furthermore, the third lens is a concave lens.

[0014] Furthermore, the mobile controller includes a conductive part and a magnetic load-bearing part. The magnetic load-bearing part is arranged in the fixed lens barrel. The conductive part is electrically connected to the main board and movably arranged between the magnetic load-bearing parts. The conductive part is transmission-connected to the mobile lens group and is used to move relative to the magnetic load-bearing part when power is turned on and drive the mobile lens group to move.

[0015] Furthermore, the mobile controller also includes an elastic member, which is respectively connected to the mobile lens group and the conductive member. The conductive member is used to compress or stretch the elastic member when powered on to drive the mobile lens group to move.

[0016] Furthermore, the conductive part includes a coil and a spring. The coil is movably arranged between the magnetic load-bearing parts and electrically connected to the mainboard. The spring is arranged on the coil and connected to the elastic part. The coil is used to push the spring to move when power is turned on to compress or stretch the elastic part.

[0017] Furthermore, the under-screen optical fingerprint module also includes a fourth lens and a fifth lens arranged in a fixed lens barrel. The fourth lens is arranged above the movable lens group, and the fifth lens is arranged between the movable lens group and the fingerprint chip. The fourth lens, the fifth lens and the movable lens group are all located on the light-sensitive path of the fingerprint chip.

[0018] Furthermore, the fourth lens and the fifth lens are both convex lenses.

[0019] Furthermore, a flexible circuit cable is provided on the side wall of the fixed lens barrel, a connector is provided on the main board, and the flexible circuit cable is connected to the mobile controller and the connector respectively for conducting the main board and the mobile controller.

[0020] In another aspect, the present invention provides a fingerprint recognition mobile terminal, comprising a display screen, a mainboard, and an under-screen optical fingerprint module. The under-screen optical fingerprint module comprises a fixed lens barrel, a mobile lens group, a mobile controller, and a fingerprint chip attached to the mainboard. The mobile lens group is movably assembled within the fixed lens barrel, which is disposed around the fingerprint chip, and the mobile lens group is disposed above the fingerprint chip. The mobile controller is disposed within the fixed lens barrel and is transmission-connected to the mobile lens group to drive the mobile lens group to move relative to the fingerprint chip. The fixed lens barrel is disposed below the display screen and attached to the mainboard. The fingerprint chip is attached to the mainboard and electrically connected to the mainboard.

[0021] Furthermore, the fingerprint recognition mobile terminal also includes a shell having a mounting opening, the display screen is assembled on the mounting opening, the fixed lens barrel, the main board and the fingerprint chip are all arranged in the shell, and the shape of the fixed lens barrel is adapted to the shape of the mounting opening.

[0022] The present invention has the following beneficial effects:

[0023] The present invention provides an under-screen optical fingerprint module, which assembles a mobile lens group and a mobile controller inside a fixed lens barrel, and drives the mobile lens group to move relative to the fingerprint chip through the mobile controller, thereby changing the focal length between the mobile lens group and the fingerprint chip to achieve a focusing function. Compared with the existing technology, the under-screen optical fingerprint module provided by the present invention plays a supporting role by setting a fixed lens barrel, and controls the movement of the mobile lens group by using the mobile controller inside the fixed lens barrel, eliminating multiple devices such as brackets, motors, and conventional lenses. The fixed lens barrel is integrated into one, and the structure is simple, which solves the problems of the original focusing solution with a complex structure, high process difficulty, and multiple steps. And by directly driving the movement of the mobile lens group to achieve the focusing function, it is possible to better realize the focus mode and capture the clearest image, thereby better improving the fingerprint recognition ability and the security of secure unlocking. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic structural diagram of an under-screen optical fingerprint module provided by the first embodiment of the present invention;

[0026] Figure 2 A schematic diagram illustrating the use of an under-screen optical fingerprint module according to the first embodiment of the present invention;

[0027] Figure 3 for Figure 1 Schematic diagram of the connection structure of the mobile controller;

[0028] Figure 4 A schematic structural diagram of an under-screen optical fingerprint module provided by a second embodiment of the present invention;

[0029] Figure 5 A schematic diagram illustrating the use of an under-screen optical fingerprint module according to the second embodiment of the present invention;

[0030] Figure 6 A schematic diagram of the first structure of a fingerprint recognition mobile terminal provided by the third embodiment of the present invention;

[0031] Figure 7 A first usage principle diagram of a fingerprint recognition mobile terminal provided by the third embodiment of the present invention;

[0032] Figure 8 A schematic diagram of a second structure of a fingerprint recognition mobile terminal provided by the third embodiment of the present invention;

[0033] Figure 9 This is a second usage principle diagram of the fingerprint recognition mobile terminal provided by the third embodiment of the present invention.

[0034] Icons: 100-under-screen optical fingerprint module; 110-fixed lens barrel; 111-flexible circuit cable; 113-connector; 130-movable lens group; 131-first lens; 133-second lens; 135-third lens; 150-movable controller; 151-conductive part; 1511-coil; 1513-shrapnel; 153-magnetic load-bearing part; 155-elastic part; 170-fingerprint chip; 180-fourth lens; 190-fifth lens; 200-fingerprint recognition mobile terminal; 210-display; 230-motherboard; 250-housing; 251-installation opening. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center," "upper," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] The prior art focusing solutions for under-screen optical fingerprint sensors usually use a lens with threads, and drive the lens movement through a bracket and a piezoelectric motor or voice coil motor arranged outside the bracket, forming a conventional dynamic focus camera module, namely an AF (Auto Focus) camera module. At this time, the piezoelectric motor or voice coil motor can only be placed on a circuit board outside the bracket due to its large size, and connected to the circuit board through pins. Due to its complex structure and large size, and the numerous manufacturing and installation processes of each component, it undoubtedly brings difficulties to packaging. At the same time, since the lens is connected by threads, its movement transmission is poor, resulting in a complicated and unreliable focusing process, making it difficult to ensure the best focusing effect. The under-screen optical fingerprint module provided by the present invention assembles a mobile lens group and a mobile controller into one body through a fixed lens barrel, and directly drives the movement of the mobile lens group through the mobile controller. It has a simple structure and low process difficulty. At the same time, it can better achieve focusing, capture the clearest image, and better improve the fingerprint recognition ability and the security of secure unlocking.

[0041] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0042] First embodiment

[0043] See also Figure 1 and Figure 2 This embodiment provides an under-screen optical fingerprint module 100, which is installed on a fingerprint recognition mobile terminal 200. It has a simple structure and low process difficulty. At the same time, it can better achieve focusing, capture the clearest image state, and better improve the fingerprint recognition ability and the security of secure unlocking.

[0044] The under-screen optical fingerprint module 100 provided in this embodiment includes a fixed lens barrel 110, a movable lens group 130, a movable controller 150 and a fingerprint chip 170 attached to the mainboard 230. The movable lens group 130 is movably assembled in the fixed lens barrel 110, and the fixed lens barrel 110 is arranged outside the fingerprint chip 170, and the movable lens group 130 is arranged above the fingerprint chip 170. The mobile controller 150 is arranged in the fixed lens barrel 110 and is transmission-connected to the movable lens group 130, and is used to drive the movable lens group 130 to move relative to the fingerprint chip 170.

[0045] In this embodiment, the under-screen optical fingerprint module 100 is installed below the display screen 210 of the fingerprint recognition mobile terminal 200 and is located above the main board 230. The lower part of the fixed lens barrel 110 is attached to the main board 230 around the fingerprint chip 170, and the upper part of the fixed lens barrel 110 is attached to the lower surface of the display screen 210, thereby forming a accommodating cavity between the display screen 210 and the main board 230. The movable lens group 130, the movable controller 150 and the fingerprint chip 170 are all arranged inside the accommodating cavity. The fingerprint chip 170 is attached to the main board 230 using the current conventional D / B (bare die bonding) process, and its signal connection is realized by W / B (gold wire bonding). Here, the main board 230 is a PCB circuit board.

[0046] It should be noted that the shape and material of the fixed lens barrel 110 are not limited in this embodiment. Its primary function is to cover the fingerprint chip 170 and provide support for the mobile lens assembly 130 and mobile controller 150. Specifically, the shape of the fixed lens barrel 110 includes, but is not limited to, a rectangular barrel, a circular barrel, a diamond-shaped barrel, etc. The fixed lens barrel 110 is attached to the mainboard 230 by dispensing glue or welding.

[0047] In this embodiment, the mobile controllers 150 are disposed on either side of the mobile lens assembly 130 and are configured to drive the mobile lens assembly 130 to perform linear motion in a direction parallel to the photosensitive surface of the fingerprint chip 170. Specifically, the mobile lens assembly 130 is directly supported by the mobile controllers 150 on either side and is driven to move left and right.

[0048] The movable lens assembly 130 includes a first lens 131 and a second lens 133 arranged in parallel. Both the first lens 131 and the second lens 133 are located in the light-sensing path of the fingerprint chip 170. A movable controller 150 is provided on both sides of the first lens 131 and the second lens 133. The movable controller 150 is used to respectively drive the first lens 131 and the second lens 133 to move in a direction parallel to the light-sensing surface of the fingerprint chip 170. Specifically, the first lens 131 is arranged above the second lens 133, and the second lens 133 is arranged above the fingerprint chip 170. The first lens 131 and the second lens 133 at least partially overlap in the light-sensing path of the fingerprint chip 170, allowing light to pass through the first lens 131 and the second lens 133 in sequence and be received by the fingerprint chip 170.

[0049] In this embodiment, the first lens 131 and the second lens 133 are both concave lenses, and there are multiple mobile controllers 150, which are respectively arranged on both sides of the first lens 131 and on both sides of the second lens 133. One or more of the mobile controllers 150 drive the first lens 131 or the second lens 133 to move in the left and right directions.

[0050] Furthermore, the under-screen optical fingerprint module 100 also includes a fourth lens 180 and a fifth lens 190 arranged in the fixed lens barrel 110. The fourth lens 180 is arranged above the movable lens group 130, and the fifth lens 190 is arranged between the movable lens group 130 and the fingerprint chip 170. The fourth lens 180, the fifth lens 190 and the movable lens group 130 are all located on the light-sensitive path of the fingerprint chip 170.

[0051] In this embodiment, the fourth lens 180 and the fifth lens 190 are both convex lenses. The optical fiber transmission and fingerprint imaging are achieved by combining two convex lenses and two concave lenses, that is, by the imaging principle of convex lenses and concave lenses.

[0052] Specifically, the fourth lens 180 and the fifth lens 190 are both fixedly mounted in the fixed barrel, and the fifth lens 190 is fixedly mounted on the bottom side of the fixed lens, close to the fingerprint chip 170, and the fourth lens 180 is fixedly mounted on the top side of the fixed lens, close to the display screen 210. From bottom to top, inside the fixed barrel 110, there are the fixed fifth lens 190, the movable second lens 133, the movable first lens 131 and the fixed fourth lens 180, among which the first lens 131 and the second lens 133 can be moved left and right by the mobile controller 150, and the left and right movements of the first lens 131 and the second lens 133 are not synchronized. The two convex lenses are fixedly mounted, and the change in the optical path position is achieved by moving the two concave lenses to diverge and refract the light distance, thereby achieving the change and focusing of the focus.

[0053] See also Figure 3 The mobile controller 150 includes a conductive member 151, a magnetic bearing member 153, and an elastic member 155. The magnetic bearing member 153 is disposed within the fixed lens barrel 110. The conductive member 151 is electrically connected to the mainboard 230 and is movably disposed between the magnetic bearing member 153. The conductive member 151 is in transmission connection with the movable lens group 130 and is configured to move relative to the magnetic bearing member and drive the movable lens group 130 when power is applied. The elastic member 155 is respectively connected to the movable lens group 130 and the conductive member 151. The conductive member 151 is configured to compress or stretch the elastic member 155 when power is applied to drive the movable lens group 130 to move.

[0054] In this embodiment, the elastic member 155 is a spring, one end of which is connected to the edge of the first lens 131 or the second lens 133, and the other end is connected to the conductive member 151. The magnetic bearing member 153 is fixedly arranged on the inner wall of the fixed lens barrel 110. For example, the magnetic bearing member 153 can be installed in a shell 250, and then the shell 250 is welded to the inner wall of the fixed lens barrel 110.

[0055] The conductive part 151 includes a coil 1511 and a spring 1513. The coil 1511 is movably arranged between the magnetic load-bearing parts 153 and electrically connected to the main board 230. The spring 1513 is arranged on the coil 1511 and connected to the elastic part 155. The coil 1511 is used to push the spring 1513 to move when power is turned on to compress or stretch the elastic part 155.

[0056] In this embodiment, the magnetic load-bearing member 153 includes two magnets with polarity, which are fixed on the inner wall of the fixed lens barrel 110 to form a magnetic field. The coil 1511 is arranged between the two magnets. After the coil 1511 is energized, under the action of the Ampere force, the coil 1511 moves in the magnetic field, thereby pushing the spring 1513 to move and compressing or stretching the spring, thereby driving the first lens 131 or the second lens 133 to move through the spring.

[0057] It should be noted that in this embodiment, springs are provided on both sides of the two concave lenses, and balance is maintained by the springs on both sides. When the spring on one side is compressed or stretched, the spring on the other side moves accordingly, thereby achieving left and right movement of the concave lenses. In other preferred embodiments of the present invention, the conductive member 151 and the magnetic bearing member can also be provided on one side of the concave lens, while the other side is connected only by a spring. This can also achieve the compression or stretching of the spring by the Ampere force generated by the conductive member 151 when it is energized, thereby achieving left and right movement of the two concave lenses.

[0058] In other preferred embodiments of the present invention, the magnetic load-bearing member 153 includes two polarized magnets, with an electrically conductive member 151 added between the two magnets. The conductive member 151 can be a wire segment or a coil 1511. The wire segment or coil 1511 is directly connected to the first lens 131 or the second lens 133. When moving left or right, one end of the mobile controller 150 is connected to the first lens 131 or the second lens 133, and the other end is fixed to the inner side of the fixed lens barrel 110. The Ampere force generated after power is applied pushes the first lens 131 or the second lens 133. The conductive member 151 directly supports the first lens 131 or the second lens 133, thereby directly pushing the first lens 131 or the second lens 133 to move left or right.

[0059] In other preferred embodiments of the present invention, the motion controller 150 can also be made directly from a special material or electroactive polymer into a wire or spring, which directly drives the first lens 131 or the second lens 133 to move left and right when powered. The specific structure of the motion controller 150 is not specifically limited herein; any structure capable of driving the first lens 131 or the second lens 133 to move linearly in the left and right directions is within the scope of protection of the present invention.

[0060] In this embodiment, a flexible circuit cable 111 is further provided on the sidewall of the fixed lens barrel 110, and a connector 113 is provided on the mainboard 230. The flexible circuit cable 111 is respectively connected to the movement controller 150 and the connector 113, providing electrical communication between the mainboard 230 and the movement controller 150. Specifically, the flexible circuit cable 111 is respectively electrically connected to the multiple coils 1511, providing power to the multiple coils 1511. The multiple coils 1511 are independently powered, enabling independent control of the multiple movement controllers 150.

[0061] In summary, this embodiment provides an under-screen optical fingerprint module 100 mounted on a mainboard 230 below the display 210. The fingerprint recognition image transmission process is as follows: When a finger touches the display 210, the light-emitting layer or other light source on the display 210 emits light onto the fingerprint path. The light reflected from the fingerprint path passes through the display 210 and reaches the fourth lens 180. The light refracted by the fourth lens 180 passes through the second lens 133 and the first lens 131, then emits light, finally passing through the fifth lens 190 and landing on the fingerprint chip 170. The image transmitted by the two concave lenses, after being transmitted to the fingerprint chip 170, undergoes image processing to determine whether it has been cleaned. The fingerprint chip then controls the motion controller 150 via current drive, which moves the first lens 131 or the second lens 133 left and right until the clearest image is captured. The movement of the first lens 131 or the second lens 133 stops, thereby capturing the clearest fingerprint. By moving the two concave lenses in the middle to diverge and refract the light, the optical path position is changed, achieving focal change and focusing. Compared to the existing technology, the under-screen optical fingerprint provided by this embodiment is assembled from bottom to top within the fixed lens barrel 110, with the fifth lens 190, the second lens 133, the first lens 131, and the fourth lens 180. The mobile controller 150 is installed on the inner wall of the fixed lens barrel 110. The mobile controller 150 moves the two concave lenses to achieve the focusing function. This has a simple structure and low process difficulty. At the same time, it can better achieve focusing and capture the clearest image, better improving the fingerprint recognition ability and the security of secure unlocking.

[0062] Second embodiment

[0063] See also Figure 4 and Figure 5 This embodiment provides an under-screen optical fingerprint module 100, whose basic structure, principle and technical effects are the same as those of the first embodiment. For the sake of brief description, for parts not mentioned in this embodiment, please refer to the corresponding content in the first embodiment.

[0064] The under-screen optical fingerprint module 100 provided in this embodiment includes a fixed lens barrel 110, a movable lens group 130, a movable controller 150 and a fingerprint chip 170 attached to the mainboard 230. The movable lens group 130 is movably assembled in the fixed lens barrel 110, and the fixed lens barrel 110 is arranged outside the fingerprint chip 170, and the movable lens group 130 is arranged above the fingerprint chip 170. The mobile controller 150 is arranged in the fixed lens barrel 110 and is transmission-connected to the movable lens group 130, and is used to drive the movable lens group 130 to move relative to the fingerprint chip 170.

[0065] In this embodiment, the mobile controllers 150 are disposed on either side of the mobile lens assembly 130 and are configured to drive the mobile lens assembly 130 to move in a direction perpendicular to the photosensitive surface of the fingerprint chip 170. Specifically, the mobile lens assembly 130 is directly supported by the mobile controllers 150 on both sides and is driven by the mobile controllers 150 to move up and down.

[0066] In this embodiment, a fourth lens 180 and a fifth lens 190 are fixedly mounted in the fixed lens barrel 110. The fourth lens 180 is positioned above the movable lens group 130, and the fifth lens 190 is positioned between the movable lens group 130 and the fingerprint chip 170. The fourth lens 180, the fifth lens 190, and the movable lens group 130 are all located in the light-sensing path of the fingerprint chip 170. Specifically, the fourth lens 180 and the fifth lens 190 are both convex lenses.

[0067] The movable lens group 130 includes a third lens 135, which is located on the photosensitive path of the fingerprint chip 170, and a movable controller 150 is provided on both sides of the third lens 135. The movable controller 150 is connected to the third lens 135 and is used to drive the third lens 135 to move in a direction perpendicular to the photosensitive surface of the fingerprint chip 170 to approach or move away from the fingerprint chip 170.

[0068] In this embodiment, the third lens 135 is a concave lens. The number of third lenses 135 can be one or more; this embodiment describes a single third lens 135. Movement controllers 150 are provided on either side of the second lens 133. These two movement controllers 150 synchronously control the raising or lowering of the third lens 135. The raising or lowering of the concave lens changes the distance of the refracted light, thereby changing the optical path position and achieving focusing.

[0069] In this embodiment, the fingerprint chip 170 is attached to the mainboard 230, the fixed lens barrel 110 is attached to the mainboard 230 and is arranged directly above the fingerprint chip 170, and the structures from bottom to top in the fixed lens barrel 110 are the fifth lens 190, the third lens 135 and the fourth lens 180. The fifth lens 190 is fixedly installed below the fixed lens barrel 110, and the fourth lens 180 is fixedly installed above the fixed lens barrel 110. The third lens 135 can move in the up and down directions under the drive of the mobile controller 150 to achieve the focusing function.

[0070] In this embodiment, the structure and principles of motion controller 150 are substantially the same as those of the first embodiment, except that, upon energization, conductive member 151 in motion controller 150 moves vertically, thereby driving third lens 135 upward or downward. The specific structure of motion controller 150 is not specifically limited herein; however, any structure capable of driving vertical linear motion of first lens 131 or second lens 133 is within the scope of protection of the present invention.

[0071] In this embodiment, a flexible circuit cable 111 is further provided on the sidewall of the fixed lens barrel 110, and a connector 113 is provided on the mainboard 230. The flexible circuit cable 111 is respectively connected to the movement controller 150 and the connector 113, providing electrical communication between the mainboard 230 and the movement controller 150. Specifically, the flexible circuit cable 111 is electrically connected to the movement controllers 150 on both sides, and the current received by the movement controllers 150 on both sides is consistent in magnitude and direction, enabling the movement controllers 150 on both sides to synchronously drive the third lens 135, causing the third lens 135 to ascend or descend.

[0072] In summary, this embodiment provides an under-screen optical fingerprint module 100 mounted on a mainboard 230 below the display 210. The fingerprint recognition image transmission process is as follows: When a finger touches the display 210, the light-emitting layer or other light source on the display 210 emits light onto the fingerprint path. The light reflected from the fingerprint path passes through the display 210 and reaches the fourth lens 180. The fourth lens 180 refracts and focuses the light. The refracted light then diverges after passing through the third lens 135, finally passing through the fifth lens 190 and falling onto the photosensitive surface of the fingerprint chip 170. After image processing, the fingerprint chip 170 drives the third lens 135 to move through the motion controller 150 in a current-dependent manner, capturing the clearest image and acquiring the image.

[0073] Third embodiment

[0074] See also Figures 6 to 9, referring to the figure, this embodiment provides a fingerprint recognition mobile terminal 200, including a display screen 210, a mainboard 230, a shell 250 and an under-screen optical fingerprint module 100, wherein the basic structure and principle of the optical fingerprint module and the technical effects produced are the same as those of the first embodiment or the second embodiment. For the sake of brief description, for parts not mentioned in this embodiment, reference may be made to the corresponding contents in the first embodiment or the second embodiment.

[0075] The under-screen optical fingerprint module 100 includes a fixed lens barrel 110, a movable lens group 130, a mobile controller 150, and a fingerprint chip 170 attached to the mainboard 230. The movable lens group 130 is movably assembled in the fixed lens barrel 110, which is arranged outside the fingerprint chip 170, and the movable lens group 130 is arranged above the fingerprint chip 170. The mobile controller 150 is arranged in the fixed lens barrel 110 and is transmission-connected to the movable lens group 130 to drive the movable lens group 130 to move relative to the fingerprint chip 170. The fixed lens barrel 110 is arranged below the display screen 210 and attached to the mainboard 230. The fingerprint chip 170 is attached to the mainboard 230 and electrically connected to the mainboard 230.

[0076] In this embodiment, a fourth lens 180, a fifth lens 190 and a movable lens group 130 are installed in the fixed lens barrel 110. The fourth lens 180 and the fifth lens 190 are convex lenses. The movable lens group 130 includes at least one concave lens. The fourth lens 180 is fixedly mounted on the upper side of the fixed lens barrel 110 and is located below the display screen 210. The fifth lens 190 is fixedly mounted on the lower side of the fixed lens barrel 110 and is located above the fingerprint chip 170. The movable lens group 130 is arranged between the fourth lens 180 and the fifth lens 190.

[0077] In this embodiment, the housing 250 has a mounting opening 251, and the display screen 210 is assembled on the mounting opening 251. The fixed lens barrel 110, the main board 230, and the fingerprint chip 170 are all disposed in the housing 250, and the shape of the fixed lens barrel 110 is adapted to the shape of the mounting opening 251. Specifically, the orthographic projection of the fixed lens barrel 110 on the display screen 210 overlaps with the display screen 210, and the size of its orthographic projection is comparable to the size of the display screen 210. By designing the fixed lens barrel 110 to be the same size as the display screen 210, the fourth lens 180 is made to be comparable in size to the display screen 210 and is disposed below the display screen 210, thereby achieving a fingerprint collection area across the entire display screen 210, thereby realizing a full-screen fingerprint focusing method.

[0078] It should be noted that the display screen 210 in this embodiment is an OLED screen. The light emitted by its self-luminous layer passes through the upper glass plate and is projected onto the fingerprint path. The light reflected from the fingerprint path then passes through the display screen 210 and enters the under-screen fingerprint recognition module. The fingerprint recognition process can refer to the first embodiment or the second embodiment.

[0079] It should also be noted that the fingerprint recognition mobile terminal 200 provided in this embodiment includes but is not limited to mobile electronic devices such as mobile phones, tablet computers and laptop computers.

[0080] The fingerprint recognition mobile terminal 200 provided in this embodiment designs the fixed lens barrel 110 to be compatible with the mounting opening 251 on the shell 250, so that the lens of the under-screen fingerprint module is of the same size as the display screen 210, thereby enabling full-screen fingerprint collection, greatly improving the convenience and practicality of fingerprint collection, and enhancing the user experience.

[0081] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An under-screen optical fingerprint module, characterized in that: The device comprises a fixed lens barrel, a movable lens group, a movable controller, and a fingerprint chip attached to a mainboard. The movable lens group is movably assembled in the fixed lens barrel, the fixed lens barrel is arranged outside the fingerprint chip, and the movable lens group is arranged above the fingerprint chip. The movable controller is arranged in the fixed lens barrel and is in transmission connection with the movable lens group, and is used to drive the movable lens group to move relative to the fingerprint chip. The mobile controller includes a conductive member and a magnetic load-bearing member, the magnetic load-bearing member is disposed in the fixed lens barrel, the conductive member is electrically connected to the mainboard and movably disposed between the magnetic load-bearing members, and the conductive member is transmission-connected to the movable lens group, and is configured to move relative to the magnetic load-bearing member and drive the movable lens group to move when power is supplied; Wherein, the fixed lens barrel is attached to the mainboard by dispensing glue or welding.

2. The under-screen optical fingerprint module according to claim 1, characterized in that: The movement controller is arranged on at least one side of the movable lens group, and is used to drive the movable lens group to perform linear motion in a direction parallel to the photosensitive surface of the fingerprint chip.

3. The under-screen optical fingerprint module according to claim 2, characterized in that: The movable lens group includes a first lens and a second lens arranged in parallel, and the first lens and the second lens are both located on the light-sensitive path of the fingerprint chip. The movable controller is provided on both sides of the first lens and both sides of the second lens, and the movable controller is used to respectively drive the first lens and the second lens to move in a direction parallel to the light-sensitive surface of the fingerprint chip.

4. The under-screen optical fingerprint module according to claim 3, characterized in that: Both the first lens and the second lens are concave lenses.

5. The under-screen optical fingerprint module according to claim 2, characterized in that: The movement controller is arranged on at least one side of the movable lens group, and is used to drive the movable lens group to perform linear motion in a direction perpendicular to the photosensitive surface of the fingerprint chip.

6. The under-screen optical fingerprint module according to claim 5, characterized in that: The movable lens group includes a third lens, which is located on the light-sensitive path of the fingerprint chip, and the movable controller is provided on both sides of the third lens. The movable controller is connected to the third lens and is used to drive the third lens to move in a direction perpendicular to the light-sensitive surface of the fingerprint chip to approach or move away from the fingerprint chip.

7. The under-screen optical fingerprint module according to claim 6, characterized in that: The third lens is a concave lens.

8. The under-screen optical fingerprint module according to claim 7, characterized in that: The movement controller further includes an elastic member, which is respectively connected to the movable lens group and the conductive member. The conductive member is used to compress or stretch the elastic member when powered on to drive the movable lens group to move.

9. The under-screen optical fingerprint module according to claim 8, characterized in that: The conductive part includes a coil and a spring. The coil is movably arranged between the magnetic load-bearing parts and electrically connected to the main board. The spring is arranged on the coil and connected to the elastic part. The coil is used to push the spring to move when power is turned on to compress or stretch the elastic part.

10. The under-screen optical fingerprint module according to any one of claims 1 to 6, characterized in that: The under-screen optical fingerprint module also includes a fourth lens and a fifth lens arranged in the fixed lens barrel. The fourth lens is arranged above the movable lens group, and the fifth lens is arranged between the movable lens group and the fingerprint chip. The fourth lens, the fifth lens and the movable lens group are all located on the light-sensitive path of the fingerprint chip.

11. The lower optical fingerprint module according to claim 10, characterized in that: The fourth lens and the fifth lens are both convex lenses.

12. The under-screen optical fingerprint module according to claim 1, characterized in that: A flexible circuit cable is further provided on the side wall of the fixed lens barrel, a connector is provided on the main board, and the flexible circuit cable is respectively connected to the mobile controller and the connector for conducting electricity between the main board and the mobile controller.

13. A fingerprint recognition mobile terminal, characterized in that: It includes a display screen, a main board and an under-screen optical fingerprint module as described in any one of claims 1 to 12, wherein the fixed lens barrel is arranged below the display screen and attached to the main board, and the fingerprint chip is attached to the main board and electrically connected to the main board.

14. The fingerprint recognition mobile terminal according to claim 13, characterized in that: The fingerprint recognition mobile terminal also includes a shell having an installation opening, the display screen is assembled on the installation opening, the fixed lens barrel, the main board and the fingerprint chip are all arranged in the shell, and the shape of the fixed lens barrel is adapted to the shape of the installation opening.

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