Fingerprint module calibration device and calibration method

Abstract

The present disclosure provides a fingerprint module calibration device and a calibration method, and relates to the technical field of electronics. The fingerprint module calibration device comprises a fingerprint module, a prism assembly and at least two standard blocks; at least two pressing surfaces and an imaging surface are located on both sides of the prism assembly, and the prism assembly has at least two light path structures; the at least two standard blocks are pressed on different pressing surfaces at the same time, and pressing images are formed on the different pressing surfaces respectively; when one of the light path structures is in a conducting state, the remaining light path structures are in a disconnected state; the pressing image on the pressing surface corresponding to the light path structure in the conducting state among the at least two pressing surfaces is transmitted to the imaging surface; the imaging surface corresponds to the fingerprint module, and the fingerprint module is calibrated through the pressing image on the imaging surface. The fingerprint module calibration device of the present disclosure can calibrate and test at least two standard blocks at one time, thereby improving the working efficiency of fingerprint module calibration and testing.

Description

Technical Field

[0001] This disclosure relates to the field of electronic technology, and in particular to a fingerprint module calibration device and calibration method. Background Technology

[0002] Electronic devices with optical fingerprint functionality require calibration of the optical fingerprint module before leaving the factory. Calibration involves three different calibration blocks: a black calibration block, a flesh-colored calibration block, and a 3D stripe calibration block. Each calibration block must be pressed individually and sequentially onto the optical fingerprint module to complete the calibration and testing. The entire calibration process requires at least three press-to-calibrate-and-release actions. While the calibration itself is very short, the pressing and releasing actions are time-consuming, thus reducing work efficiency. Summary of the Invention

[0003] This disclosure provides a fingerprint module calibration device and calibration method, which can solve the problem of low efficiency in optical fingerprint calibration.

[0004] The technical solution is as follows:

[0005] On the one hand, a fingerprint module calibration device is provided, the fingerprint module calibration device comprising: a fingerprint module, a prism assembly and at least two standard blocks;

[0006] The prism assembly has at least two pressing surfaces on one side, at least two optical path structures inside the prism assembly, and an imaging surface on the other side of the prism assembly;

[0007] The number of pressing surfaces, the optical path structure, and the standard blocks are the same;

[0008] The at least two standard blocks are configured to be pressed simultaneously onto different pressing surfaces, and to form at least two pressing images on the different pressing surfaces respectively;

[0009] The at least two optical path structures are configured such that when one optical path structure is in the conducting state, the other optical path structures are in the disconnected state.

[0010] The pressing image on the pressing surface corresponding to the optical path structure in the conducting state among the at least two pressing surfaces is transmitted to the imaging surface;

[0011] The imaging surface corresponds to the fingerprint module, and the fingerprint module is calibrated using the pressure image on the imaging surface.

[0012] In some embodiments, the prism assembly further includes at least two polarizers, which are configured to control the on / off state of the at least two optical path structures respectively.

[0013] In some embodiments,

[0014] The at least two standard blocks include a first standard block, a second standard block, and a third standard block; the at least two pressing surfaces include a first pressing surface, a second pressing surface, and a third pressing surface; the at least two optical path structures include a first optical path structure, a second optical path structure, and a third optical path structure.

[0015] The first standard block is pressed onto the first pressing surface to form a first pressing image; the second standard block is pressed onto the second pressing surface to form a second pressing image; the third standard block is pressed onto the third pressing surface to form a third pressing image; when the first optical path structure is configured to be in a conducting state, the first pressing image is transmitted to the imaging surface; when the second optical path structure is configured to be in a conducting state, the second pressing image is transmitted to the imaging surface; when the third optical path structure is configured to be in a conducting state, the third pressing image is transmitted to the imaging surface.

[0016] In some embodiments, the prism assembly is in the shape of an inverted trapezoid;

[0017] The imaging surface is disposed on the upper bottom surface of the inverted trapezoid;

[0018] The first pressing surface, the second pressing surface, and the third pressing surface are arranged side by side on the bottom surface of the inverted trapezoid.

[0019] In some embodiments, the prism assembly includes a first prism, a second prism, a third prism, and a fourth prism;

[0020] The first prism includes a first side surface, a second side surface, and a third side surface;

[0021] The first side surface forms the upper base of the inverted trapezoid; the second prism is disposed on the second side surface, and the third prism is disposed on the third side surface, with the second prism and the third prism having symmetrical shapes;

[0022] The fourth prism includes a fourth side surface, a fifth side surface, and a sixth side surface;

[0023] The fourth prism and the first prism are arranged symmetrically along the top and bottom of the inverted trapezoid. The fourth side is located on the bottom surface of the inverted trapezoid. The fifth side is connected to the second prism, and the sixth side is connected to the third prism.

[0024] In some embodiments,

[0025] The at least two polarizers include a first polarizer, a second polarizer, a third polarizer, and a fourth polarizer;

[0026] A first polarizer is disposed on the second side; a second polarizer is disposed on the third side; a third polarizer is disposed on the fifth side; and a fourth polarizer is disposed on the sixth side.

[0027] The first polarizer, the second polarizer, and the third polarizer control the on / off state of the first optical path structure;

[0028] The first polarizer, the second polarizer, and the fourth polarizer are configured to control the on / off state of the second optical path structure;

[0029] The first polarizer, the second polarizer, the third polarizer, and the fourth polarizer are configured to control the on / off state of the third optical path structure.

[0030] In some embodiments, the second prism further includes a first mirror surface;

[0031] The image of the first pressing surface is transmitted through the first mirror to the second polarizer and the third polarizer, and then through the second polarizer and the third polarizer to the imaging surface;

[0032] The third prism also includes a second mirror surface;

[0033] The image of the second pressing surface is transmitted through the second mirror to the first polarizer and the fourth polarizer, and then through the first polarizer and the fourth polarizer to the imaging surface;

[0034] The image of the third pressing surface is transmitted to the imaging surface through the third polarizer, the fourth polarizer, the first polarizer, and the second polarizer.

[0035] In some embodiments, the first polarizer is configured to be turned on or off by an electrical signal; when the first polarizer is on, light passes through the first polarizer, and when the first polarizer is off, light cannot pass through the first polarizer.

[0036] The second polarizer is configured to be turned on or off by an electrical signal; when the second polarizer is on, light passes through the second polarizer, and when the second polarizer is off, light cannot pass through the second polarizer.

[0037] The third polarizer is configured to be turned on or off by an electrical signal; when the third polarizer is on, light passes through it, and when the third polarizer is off, light cannot pass through it.

[0038] On the other hand, a fingerprint module calibration method is provided, wherein the fingerprint module calibration method employs the aforementioned fingerprint module calibration device, and the fingerprint module calibration method includes:

[0039] The at least two standard blocks are pressed simultaneously onto different pressing surfaces, forming at least two pressing images on the different pressing surfaces respectively;

[0040] The at least two optical path structures are configured such that when one of the optical path structures is in the conducting state, the other optical path structures are in the disconnected state.

[0041] The pressing image on the pressing surface corresponding to the optical path structure in the conductive state of the at least two pressing surfaces is transmitted to the imaging surface;

[0042] The fingerprint module is calibrated using the pressure image on the imaging surface.

[0043] In some embodiments, the prism assembly further comprises at least two polarizers;

[0044] The configuration of the at least two optical path structures such that when one optical path structure is in a conducting state, the other optical path structures are all in a disconnected state includes:

[0045] When one of the at least two optical path structures is in a conducting state controlled by the at least two polarizers, the other optical path structures are in a disconnected state.

[0046] In some embodiments, the at least two standard blocks include a first standard block, a second standard block, and a third standard block; the at least two pressing surfaces include a first pressing surface, a second pressing surface, and a third pressing surface; the at least two optical path structures include a first optical path structure, a second optical path structure, and a third optical path structure; and the at least two polarizers include a first polarizer, a second polarizer, a third polarizer, and a fourth polarizer.

[0047] When one of the at least two optical path structures is controlled to be in a conducting state by the at least two polarizers, the remaining optical path structures are all in a disconnected state, including:

[0048] Turn on the first polarizer, and turn off the third polarizer and the second polarizer, thereby controlling the first optical path structure to be in a conducting state and the second optical path structure and the third optical path structure to be in a disconnected state;

[0049] Turn on the second polarizer, turn off the fourth polarizer and the first polarizer, control the second optical path structure to be in a conducting state, and control the first optical path structure and the third optical path structure to be in a disconnected state;

[0050] The first polarizer, the second polarizer, the third polarizer, and the fourth polarizer are controlled to be turned on, the third optical path structure is in a conducting state, and the first optical path structure and the second optical path structure are in a disconnected state.

[0051] The beneficial effects of the technical solution provided in this disclosure include at least the following:

[0052] The fingerprint module calibration device disclosed herein has at least two pressing surfaces on a prism assembly. The pressing surfaces are used to press standard blocks. The prism assembly with at least two pressing surfaces can press at least two standard blocks at a time. The prism assembly transmits the images on the at least two pressing surfaces to the imaging surface through an optical path structure. The imaging surface corresponds to the fingerprint acquisition area of ​​the fingerprint module. The fingerprint acquisition area can acquire the image of the imaging surface, that is, at least two standard blocks can be recognized by the fingerprint module. The device can perform calibration and testing of at least two standard blocks in a single pressing action, saving the action and switching time of pressing and lifting multiple calibration blocks one by one, and improving the work efficiency of fingerprint module calibration and testing. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of the fingerprint module calibration device provided in the embodiments of this disclosure;

[0055] Figure 2 This is a schematic diagram of the structure of a prism assembly with a polarizer provided in an embodiment of this disclosure;

[0056] Figure 3 This is a schematic diagram of the structure of a fingerprint module calibration device provided in another embodiment of this disclosure;

[0057] Figure 4 This is an exploded view of the mating structure of the prism assembly and polarizer provided in another embodiment of this disclosure;

[0058] Figure 5 This is an exemplary application diagram of a fingerprint module calibration device provided in another embodiment of this disclosure;

[0059] Figure 6 This is a schematic diagram of the fingerprint module calibration method provided in the embodiments of this disclosure;

[0060] Figure 7 This is a schematic diagram of a fingerprint module calibration method provided in another embodiment of this disclosure;

[0061] Figure 8 This is a schematic diagram of a fingerprint module calibration method provided in another embodiment of this disclosure.

[0062] The reference numerals in the figure are respectively:

[0063] 1. Fingerprint module; 101. Fingerprint acquisition area; 2. Prism assembly; 3. Standard block;

[0064] 201. Pressing surface; 202. Optical path structure; 203. Imaging surface; 204. Polarizer;

[0065] 2011, First pressing surface; 2012, Second pressing surface; 2013, Third pressing surface;

[0066] 2021, First optical path structure; 2022, Second optical path structure; 2023, Third optical path structure;

[0067] 21. First prism; 22. Second prism; 23. Third prism; 24. Fourth prism;

[0068] 211. First side view; 212. Second side view; 213. Third side view;

[0069] 241. Fourth side view; 242. Fifth side view; 243. Sixth side view;

[0070] 221. First mirror surface; 231. Second mirror surface;

[0071] 2041, First polarizer; 2042, Second polarizer; 2043, Third polarizer; 2044, Fourth polarizer;

[0072] 301, First standard block; 302, Second standard block; 303, Third standard block;

[0073] 4. Electronic devices; 5. Display screens. Detailed Implementation

[0074] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0075] It should be understood that "at least one" in this article refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0076] Fingerprint recognition involves classifying and comparing the fingerprints of the person being identified to make a judgment.

[0077] Fingerprint imaging recognition technology is a technology that uses an optical fingerprint sensor to capture images of a human fingerprint, then compares them with existing fingerprint imaging information in the system to determine whether they are correct, thereby achieving identity recognition.

[0078] In real-world environments, differences exist between different sensing units within the same fingerprint sensor. In addition, the unevenness and impurities in the adhesive, as well as the flatness of the protective cover, can all lead to uneven responses between the sensing units. Therefore, accurate fingerprint texture features cannot be directly obtained from the data output by the fingerprint sensor. The output data must be corrected to eliminate this unevenness.

[0079] Therefore, electronic devices using fingerprint recognition technology need to have their optical fingerprint modules calibrated before leaving the factory. Usually, three different calibration blocks are used: a black calibration block, a flesh-colored calibration block, and a 3D stripe calibration block, which are pressed in sequence. However, this reduces work efficiency.

[0080] This disclosure provides a fingerprint module calibration device and calibration method, which can quickly and efficiently calibrate the optical fingerprint module of electronic devices, thereby improving the efficiency of calibration work.

[0081] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0082] On the one hand, embodiments of this disclosure provide a fingerprint module calibration device.

[0083] Combination Figure 1 As shown, a fingerprint module calibration device includes: a fingerprint module 1, a prism assembly 2, and at least two standard blocks 3; one side of the prism assembly 2 has at least two pressing surfaces 201, and the prism assembly 2 has at least two optical path structures 202, and the other side of the prism assembly 2 has an imaging surface 203; the number of pressing surfaces 201, optical path structures 202, and standard blocks 3 are the same; the at least two standard blocks 3 are configured to be pressed simultaneously on different pressing surfaces 201, and to form at least two pressing images on the different pressing surfaces 201 respectively; the at least two optical path structures 202 are configured such that when one optical path structure 202 is in a conducting state, the other optical path structures 202 are all in a disconnected state; the pressing image on the pressing surface 201 corresponding to the optical path structure 202 in the conducting state is transmitted to the imaging surface 203; the imaging surface 203 corresponds to the fingerprint module 1, and the fingerprint module 1 is calibrated by the pressing image on the imaging surface 203.

[0084] In this embodiment, the fingerprint module calibration device has at least two pressing surfaces 201 on the prism assembly 2. The pressing surfaces 201 are used to press the standard blocks 3. The prism assembly with at least two pressing surfaces 201 can press at least two standard blocks 3 at a time. The optical path structure 202 in the prism assembly 2 can be turned on or off in a controlled manner. When one of the optical path structures 202 is turned on, the image on the pressing surface 201 can be transmitted to the imaging surface 203. The imaging surface 203 corresponds to the fingerprint module 1. The fingerprint module 1 can acquire the image of the imaging surface, that is, at least two standard blocks 3 can be recognized by the fingerprint module 1. At least two standard blocks 3 can be calibrated and tested in one pressing action, saving the action and switching time of pressing and lifting multiple calibration blocks 3 one by one, and improving the working efficiency of the fingerprint module 1 calibration and testing.

[0085] Optionally, the calibration block is at least two of the following: a black calibration block, a flesh-colored calibration block, and a 3D stripe calibration block.

[0086] Optionally, the fingerprint module 1 is an optical fingerprint module, which includes a photosensitive element. The fingerprint module 1 is disposed below the display screen of the electronic device, and can acquire images of the imaging surface 203 through the display screen of the electronic device.

[0087] In some embodiments, combined with Figure 2 As shown, the prism assembly 2 is also provided with at least two polarizers 204, which are used to control the on / off state of at least two optical path structures 202 respectively.

[0088] Optionally, the polarizer 204 has a film structure and can be flatly attached to the surface of the prism. When the polarizer is turned on, light entering the polarizer 204 from the prism, or entering the prism from the polarizer 204, will not be reflected, refracted, or scattered, nor will its physical properties be altered.

[0089] In this embodiment of the fingerprint module calibration device, a polarizer 204 is provided in the prism assembly 2. The polarizer 204 has the function of controlling the light transmission. By controlling the state of the polarizer 204, the on / off state of the optical path structure 202 is controlled, so as to achieve the purpose of transmitting a single press image to the imaging surface 203.

[0090] In some embodiments, combined with Figure 3As shown, at least two standard blocks 3 include a first standard block 301, a second standard block 302, and a third standard block 303; at least two pressing surfaces 201 include a first pressing surface 2011, a second pressing surface 2012, and a third pressing surface 2013; at least two optical path structures 202 include a first optical path structure 2021, a second optical path structure 202, and a third optical path structure 2023; the first standard block 301 is pressed onto the first pressing surface 2011 to form a first pressing image; the second... Standard block 302 is pressed onto second pressing surface 2012 to form a second pressing image; third standard block 303 is pressed onto third pressing surface 2013 to form a third pressing image; when first optical path structure 2021 is in the conducting state, the first pressing image is transmitted to imaging surface 203; when second optical path structure 2022 is in the conducting state, the second pressing image is transmitted to imaging surface 203; when third optical path structure 2023 is in the conducting state, the third pressing image is transmitted to imaging surface 203.

[0091] In this embodiment, the fingerprint module calibration device has three pressing surfaces 201 on the prism assembly 2, corresponding to the three calibration blocks 3 required for fingerprint calibration: a black calibration block, a flesh-colored calibration block, and a 3D stripe calibration block. After the three standard blocks 3 are pressed synchronously onto the prism assembly 2, the images from the three pressing surfaces 201 can be transmitted to the imaging surface 203 through the optical path structure 202, enabling the fingerprint module 1 to recognize the images and complete the calibration and testing.

[0092] In some embodiments, combined with Figure 4 As shown, the prism assembly 2 is in the shape of an inverted trapezoid; the imaging surface 203 is disposed on the upper bottom surface of the inverted trapezoid; the first pressing surface 2011, the second pressing surface 2012 and the third pressing surface 2013 are disposed side by side on the lower bottom surface of the inverted trapezoid.

[0093] In this embodiment of the fingerprint module calibration device, the prism assembly 2 is an inverted trapezoid, which satisfies the image transmission requirement that multiple pressing surfaces 201 correspond to one imaging surface 203. The multiple pressing surfaces 201 are arranged side by side on the lower bottom surface of the inverted trapezoid, and the imaging surface 203 is arranged on the upper bottom surface of the inverted trapezoid. By setting an optical path structure 202 in the prism assembly 2 and controlling the optical path structure 202, a many-to-one correspondence between the pressing surfaces 201 and the imaging surface 203 can be realized.

[0094] In some embodiments, combined with Figure 4As shown, the prism assembly 2 includes a first prism 21, a second prism 22, a third prism 23, and a fourth prism 24. The first prism 21 is a triangular prism, including a first side surface 211, a second side surface 212, and a third side surface 213. The first side surface 211 forms the upper base of an inverted trapezoid. The second prism 22 is disposed on the second side surface 212, and the third prism 23 is disposed on the third side surface 213. The second prism 22 and the third prism 23 are symmetrical in shape. The fourth prism 24 is a triangular prism, including a fourth side surface 241, a fifth side surface 242, and a sixth side surface 243. The fourth prism 24 and the first prism 21 are arranged symmetrically along the upper and lower sides of the inverted trapezoid. The fourth side surface 241 is located on the lower base of the inverted trapezoid. The fifth side surface 242 is connected to the second prism 22, and the sixth side surface 243 is connected to the third prism 23.

[0095] The fingerprint module calibration device of this embodiment uses a prism assembly 2 composed of four prisms to form three optical path structures 2023, which can transmit the images on the three pressing surfaces 201 to the imaging surface 203 respectively. The fingerprint module 1 can complete the calibration and testing of three standard blocks 3 after one press, saving the switching time of pressing and lifting multiple standard blocks and improving the calibration efficiency of the fingerprint module 1.

[0096] The first prism 21 and the fourth prism 24 are designed as triangular prisms. The first side surface 211 and the second side surface 212 are in contact with the second prism 22 and the third prism 23, respectively. The image on the first pressing surface 2011 of the second prism 22 can be transmitted, reflected or refracted through the second prism 22, enter the first prism 21 through the first side surface 211, and then be transmitted to the imaging surface 203 through the transmission, reflection or refraction of the first prism 21.

[0097] The image on the second pressing surface 2012 of the third prism 23 can be transmitted, reflected or refracted by the third prism 23, enter the first prism 21 through the second side surface 212, and then be transmitted to the imaging surface 203 through the transmission, reflection or refraction of the first prism 21.

[0098] The fifth side surface 242 and the sixth side surface 243 also contact the second prism 22 and the third prism 23 respectively. The image on the third pressing surface 2013 of the fourth prism 24 can be transmitted, reflected or refracted sequentially through the second prism 22 and the third prism 23, first through the fifth side surface 242 and the sixth side surface 243, then through the first side surface 211 and the second side surface 212 into the first prism 21, and then transmitted to the imaging surface 203 through the transmission, reflection or refraction of the first prism 21.

[0099] The second side surface 212 and the third side surface 213 of the first prism 21 and the fifth side surface 242 and the sixth side surface 243 of the fourth prism 24 form an X-shaped intersecting surface. The first side surface 211 is parallel to the fourth side surface 241, and the edges of the first prism 21 and the fourth prism 24 are in contact.

[0100] Thus, the first optical path structure 2021, the second optical path structure 2022, and the third optical path structure 2023 are arranged in a trident shape within the prism assembly 2. The three pressing surfaces 201 are distributed alternately on the second prism 22, the fourth prism 24, and the third prism 23. The three optical path structures 202 are concentrated on the first prism 21, transmitting the images of the three standard blocks 3 to the imaging surface 203, enabling the fingerprint module 1 to successfully acquire the images for calibration and testing, thereby improving the efficiency of the calibration and testing of the fingerprint module 1.

[0101] Optionally, an optical material is provided on the second side 212 to process the light propagating from the first optical path structure 2021 to the imaging surface 203, so that it better meets the calibration requirements of the fingerprint module 1.

[0102] For example, optical materials include light-filtering materials and anti-reflective materials, wherein light-filtering materials may include color filters and infrared filters.

[0103] Understandably, the third side 213 can also be provided with optical materials to process the light rays from the second optical path structure 2022; the fifth side 242 and the sixth side 243 can also be provided with optical materials to process the light rays from the third optical path structure 2023.

[0104] Optionally, the cross-sections of the first prism 21 and the fourth prism 24 are isosceles right triangles, the second side 212 and the third side 213 are perpendicular to each other, and the first prism 21 and the fourth prism 24 are set in the middle of the inverted trapezoid. The second prism 22 and the third prism 23 have the same shape and are symmetrically connected to the first prism 21 and the fourth prism 24 to form the two sides and the base angle of the inverted trapezoid.

[0105] Thus, the light rays within the first optical path structure 2021 can illuminate the inclined surface formed by the fifth side 242 and the second side 212 at a 45° angle, and then vertically illuminate the imaging surface 203. The light rays within the second optical path structure 2022 can illuminate the inclined surface formed by the sixth side 243 and the second side 212 at a 45° angle, and then vertically illuminate the imaging surface 203. The light rays within the third optical path structure 2023 can be transmitted vertically to the imaging surface 203 through the fourth prism 24, the second prism 22, the third prism 23, and the first prism 21. All three optical path structures 202 can ensure that the pressed image is transmitted to the imaging surface 203 without distortion or deformation, ensuring accurate calibration and testing of the fingerprint module 1.

[0106] In some embodiments, at least two polarizers 204 include a first polarizer 2041, a second polarizer 2042, a third polarizer 2043, and a fourth polarizer 2044; the first polarizer 2041 is disposed on a second side 212, the second polarizer 2042 is disposed on a third side 213; the third polarizer 2043 is disposed on a fifth side 242; and the fourth polarizer 2044 is disposed on a sixth side 243; the first polarizer 2041, the second polarizer 2042, and the third polarizer 2043 control the on / off state of the first optical path structure 2021; the second polarizer 2042, the fourth polarizer 2044, and the first polarizer 2041 control the on / off state of the second optical path structure 2022; and the first polarizer 2041, the second polarizer 2042, the third polarizer 2043, and the fourth polarizer 2044 control the on / off state of the third optical path structure 2023.

[0107] The fingerprint module calibration device of this embodiment has a first polarizer 2041, a second polarizer 2042, a third polarizer 2043, and a fourth polarizer 2043 respectively provided on the X-shaped cross surface between the four prisms. It can control whether the light reaching the cross surface is allowed to pass through. At the same time, only the image of one of the pressing surfaces 201 is allowed to be successfully transmitted to the imaging surface 203, thereby meeting the calibration and testing requirements of the fingerprint module 1.

[0108] In some embodiments, the second prism 22 further includes a first mirror 221; the image of the first pressing surface 2011 is transmitted through the first mirror 221 to the second polarizer 2042 and the third polarizer 2043, and the second polarizer 2042 and the third polarizer 2043 transmit the image to the imaging surface 203; the third prism 23 further includes a second mirror 231; the image of the second pressing surface 2012 is transmitted through the second mirror 231 to the first polarizer 2041 and the fourth polarizer 2044, and the first polarizer 2041 and the fourth polarizer 2044 transmit the image to the imaging surface 203; the image of the third pressing surface 2013 is transmitted to the imaging surface 203 through the third polarizer 2043, the fourth polarizer 2044, the first polarizer 2041 and the second polarizer 2042.

[0109] In the fingerprint module calibration device of this embodiment, the light from the first optical path structure 2021 can be reflected sequentially by the first mirror 221, the second polarizer 2042, and the third polarizer 2043, and then transmitted vertically to the imaging surface 203. If the second polarizer 2042 and the third polarizer 2043 are controlled to not reflect, the first optical path structure 205 is disconnected, and the image of the first pressing surface 201 cannot be transmitted to the imaging surface 203.

[0110] The light from the second optical path structure 2022 can be reflected sequentially by the second mirror 231, the first polarizer 2041, and the fourth polarizer 2044, and then transmitted vertically to the imaging surface 203. If the first polarizer 2041 and the fourth polarizer 2044 are controlled to prevent reflection, then the second optical path structure 2022 is disconnected.

[0111] The light from the third optical path structure 2023 can be transmitted vertically to the imaging surface 203 through the transmission of the third polarizer 2043, the fourth polarizer 2044, the first polarizer 2041, and the second polarizer 2042 in sequence. If the third polarizer 2043 and the fourth polarizer 2044 cannot transmit light, or the first polarizer 2041 and the second polarizer 2042 cannot transmit light, then the third optical path structure 2023 is disconnected.

[0112] Optionally, the first mirror 221 is configured to allow light from the first optical path structure 2021 to illuminate the side formed by the fourth side 241 and the third side 213 at a 45° angle; the second mirror 231 is configured to allow light from the second optical path structure 2022 to illuminate the side formed by the sixth side 243 and the second side 212 at a 45° angle.

[0113] In some embodiments, the first polarizer 2041 is configured to be turned on or off by an electrical signal; when the first polarizer 2041 is on, light passes through the first polarizer 2041; when the first polarizer 2041 is off, light cannot pass through the first polarizer 2041. The second polarizer 2042 is configured to be turned on or off by an electrical signal; when the second polarizer 2042 is on, light passes through the second polarizer 2042; when the second polarizer 2042 is off, light cannot pass through the second polarizer 2042. The third polarizer 2043 is configured to be turned on or off by an electrical signal; when the third polarizer 2043 is on, light passes through the third polarizer 2043; when the third polarizer 2043 is off, light cannot pass through the third polarizer 2043.

[0114] In this embodiment, the fingerprint module calibration device comprises a prism assembly 2 consisting of four prisms. Different polarizers are disposed on the surfaces of each prism, and the opening and closing of these polarizers are controlled to achieve on / off control of different optical path structures. The polarizers are controlled by electrical signals to open and close, facilitating automated design of the device or integration with production equipment to achieve automatic calibration and testing of the fingerprint module 1.

[0115] For example, combined Figure 5 As shown, the fingerprint module calibration device provided in this embodiment is used for the calibration and testing of the fingerprint module 1 located below the display screen 5 of the electronic device 4, that is, for the calibration and testing of the under-display fingerprint module 1 of the electronic device 4.

[0116] The fingerprint module calibration device is placed on the display screen 5, and the imaging surface 203 is attached to the surface of the display screen 5 corresponding to the fingerprint collection area 101 of the fingerprint module 1. The first pressing surface 2011, the second pressing surface 2012, and the third pressing surface 2013 are arranged side by side facing the top of the display screen 5. After the first calibration block, the second calibration block, and the third calibration block are lifted at once, they move down toward the display screen 5 until they are pressed onto the three pressing surfaces respectively.

[0117] By controlling the opening and closing of different polarizers, the three optical path structures are sequentially activated to perform calibration and testing of the three standard blocks. Afterwards, the calibration blocks and fingerprint module calibration device are removed, completing the calibration and testing of fingerprint module 1.

[0118] Optionally, the standard block 3 can be integrated with the prism assembly 2. For example, the first standard block 301 can be fixedly connected to the first pressing surface 2011, the second standard block 302 can be fixedly connected to the second pressing surface 2012, and the third standard block 303 can be fixedly connected to the third pressing surface 2013. Thus, the pressing of the standard block 3 is completed at the same time as the fingerprint module calibration device is placed in place, further improving the efficiency of the fingerprint module 1 calibration and testing.

[0119] The electronic device 4 can be a portable mobile terminal, such as a smartphone, tablet, laptop, or desktop computer. The electronic device 4 may also be referred to as user equipment, portable terminal, laptop terminal, desktop terminal, or other names.

[0120] On the other hand, this disclosure provides a fingerprint module calibration method, which uses the aforementioned fingerprint module calibration device, combined with... Figure 6 As shown, the fingerprint module calibration method includes:

[0121] S1, press at least two standard blocks 3 simultaneously onto different pressing surfaces 201, and form at least two pressing images on the different pressing surfaces 201 respectively;

[0122] S2, at least two optical path structures 202 are configured such that when one of the optical path structures 202 is in the conducting state, the other optical path structures 202 are in the disconnected state;

[0123] S3, the pressing image on the pressing surface 201 corresponding to the optical path structure 202 in the conducting state of at least two pressing surfaces 201 is transmitted to the imaging surface 203;

[0124] S4, the fingerprint module 1 is calibrated using the pressing image on the imaging surface 203.

[0125] The fingerprint module calibration method of this embodiment can perform calibration and testing of at least two standard blocks 3 in one pressing action, saving the action and switching time of pressing and lifting multiple calibration blocks 3 one by one, and improving the work efficiency of fingerprint module 1 calibration and testing.

[0126] In some embodiments, combined with Figure 7 As shown, the prism assembly 2 also has at least two polarizers 204;

[0127] Figure 6 S2 in the example configures at least two optical path structures 202 such that when one optical path structure 202 is in the conducting state, the other optical path structures 202 are all in the disconnected state, including:

[0128] S201, when one of the at least two optical path structures 202 is in the conducting state by controlling it through at least two polarizers, the other optical path structures 202 are all in the disconnected state.

[0129] The fingerprint module calibration method in this embodiment controls the on / off state of the optical path structure 202 by controlling the state of the polarizer 204, thereby achieving the purpose of transmitting a single press image to the imaging surface 203.

[0130] In some embodiments, in the fingerprint module calibration device of this embodiment, at least two standard blocks 3 include a first standard block 301, a second standard block 302, and a third standard block 303; at least two pressing surfaces 201 include a first pressing surface 2011, a second pressing surface 2012, and a third pressing surface 2013; at least two optical path structures 202 include a first optical path structure 2021, a second optical path structure 2022, and a third optical path structure 2023; and at least two polarizers 204 include a first polarizer 2041, a second polarizer 2042, a third polarizer 2043, and a fourth polarizer 2044.

[0131] When at least one of the at least two optical path structures 202 is in a conducting state controlled by at least two polarizers, the remaining optical path structures 202 are all in a disconnected state, including:

[0132] Turn on the first polarizer 2041, turn off the third polarizer 2043 and the second polarizer 2042, and control the first optical path structure 2021 to be in the conducting state, and the second optical path structure 2022 and the third optical path structure 2023 to be in the disconnected state.

[0133] Turn on the second polarizer 2042, turn off the fourth polarizer 2044 and the first polarizer 2041, control the second optical path structure 2022 to be in the conducting state, and control the first optical path structure 2021 and the third optical path structure 2023 to be in the disconnected state.

[0134] The first polarizer 2041, the second polarizer 2042, the third polarizer 2043 and the fourth polarizer 2044 are turned on, the third optical path structure 2023 is in the conducting state, and the first optical path structure 2021 and the second optical path structure 2022 are in the disconnected state.

[0135] like Figure 8 As shown, the fingerprint module calibration method provided in this application includes:

[0136] S101 simultaneously presses three standard blocks 3 onto different pressing surfaces 201, forming three-press images on different pressing surfaces 201 respectively;

[0137] S2011 turns on the first polarizer 2041, turns off the third polarizer 2043 and the second polarizer 2042, controls the first optical path structure 2021 to be in the conducting state, and the second optical path structure 2022 and the third optical path structure 2023 to be in the disconnected state.

[0138] S301 transmits the first pressing image on the first pressing surface 2011 to the imaging surface 203;

[0139] S401 calibrates the fingerprint module 1 using the first press image on the imaging surface 203;

[0140] S2012 turns on the second polarizer 2042, turns off the fourth polarizer 2044 and the first polarizer 2041, controls the second optical path structure 2022 to be in the conducting state, and controls the first optical path structure 2021 and the third optical path structure 2023 to be in the disconnected state.

[0141] S302 transmits the second pressing image on the second pressing surface 2012 to the imaging surface 203;

[0142] S402 calibrates the fingerprint module 1 using the second press image on the imaging surface 203;

[0143] S2013 controls the first polarizer 2041, the second polarizer 2042, the third polarizer 2043 and the fourth polarizer 2044 to be turned on, the third optical path structure 2023 to be in the conducting state, and the first optical path structure 2021 and the second optical path structure 2022 to be in the disconnected state.

[0144] S303 transmits the third pressing image on the third pressing surface 2013 to the imaging surface 203;

[0145] S403 calibrates the fingerprint module 1 using the third press image on the imaging surface 203.

[0146] In the fingerprint module calibration method of this embodiment, after the three standard blocks 3 are pressed synchronously on the prism assembly 2, the images of the three pressing surfaces 201 are sequentially transmitted to the imaging surface 203 by configuring different combinations of the open and closed states of the four polarizers. The fingerprint module 1 recognizes the images and completes the calibration and testing.

[0147] The fingerprint module calibration device and calibration method of this disclosure adopt a multi-prism combination optical path design and multiple polarizers to control the reflection and transmission paths of light and the switching of the optical path. The structure is simple, the failure rate is low, and the calibration performance and accuracy are more reliable and accurate. It realizes synchronous calibration of multiple calibration blocks, reduces the time for switching calibration blocks in calibration and testing, and improves work efficiency.

[0148] The above description is merely an embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A fingerprint module calibration device, characterized in that, The fingerprint module calibration device includes: a fingerprint module (1), a prism assembly (2), and at least two standard blocks (3); The prism assembly (2) has at least two pressing surfaces (201) on one side, at least two optical path structures (202) inside the prism assembly (2), and an imaging surface (203) on the other side of the prism assembly (2). The number of pressing surfaces (201), optical path structures (202) and standard blocks (3) are the same. The at least two standard blocks (3) are configured to press simultaneously onto different pressing surfaces (201) and form at least two pressing images on the different pressing surfaces (201) respectively; The at least two optical path structures (202) are configured such that when one of the optical path structures (202) is in the conducting state, the other optical path structures (202) are in the disconnected state; The pressing image on the pressing surface (201) of the at least two pressing surfaces (201) corresponding to the optical path structure (202) in the conducting state is transmitted to the imaging surface (203); The imaging surface (203) corresponds to the fingerprint module (1), and the fingerprint module (1) is calibrated by the pressing image on the imaging surface (203); The prism assembly (2) also has at least two polarizers (204), which are configured to control the on / off states of the at least two optical path structures (202) respectively.

2. The fingerprint module calibration device according to claim 1, characterized in that, The at least two standard blocks (3) include a first standard block (301), a second standard block (302), and a third standard block (303); the at least two pressing surfaces (201) include a first pressing surface (2011), a second pressing surface (2012), and a third pressing surface (2013); the at least two optical path structures (202) include a first optical path structure (2021), a second optical path structure (2022), and a third optical path structure (2023); The first standard block (301) is pressed on the first pressing surface (2011) to form a first pressing image, the second standard block (302) is pressed on the second pressing surface (2012) to form a second pressing image, and the third standard block (303) is pressed on the third pressing surface (2013) to form a third pressing image; When the first optical path structure (2021) is configured to be in the conducting state, the first pressing image is transmitted to the imaging surface (203); when the second optical path structure (2022) is configured to be in the conducting state, the second pressing image is transmitted to the imaging surface (203); when the third optical path structure (2023) is configured to be in the conducting state, the third pressing image is transmitted to the imaging surface (203).

3. The fingerprint module calibration device according to claim 2, characterized in that, The prism assembly (2) is in the shape of an inverted trapezoid; The imaging surface (203) is disposed on the upper bottom surface of the inverted trapezoid; The first pressing surface (2011), the second pressing surface (2012), and the third pressing surface (2013) are arranged side by side on the bottom surface of the inverted trapezoid.

4. The fingerprint module calibration device according to claim 3, characterized in that, The prism assembly (2) includes a first prism (21), a second prism (22), a third prism (23), and a fourth prism (24); The first prism (21) includes a first side surface (211), a second side surface (212), and a third side surface (213); The first side surface (211) forms the upper base of the inverted trapezoid; the second prism (22) is disposed on the second side surface (212), and the third prism (23) is disposed on the third side surface (213). The second prism (22) and the third prism (23) are symmetrical in shape. The fourth prism (24) includes a fourth side surface (241), a fifth side surface (242), and a sixth side surface (243); The fourth prism (24) and the first prism (21) are arranged symmetrically along the top and bottom of the inverted trapezoid. The fourth side surface (241) is located on the bottom surface of the inverted trapezoid. The fifth side surface (242) is connected to the second prism (22). The sixth side surface (243) is connected to the third prism (23).

5. The fingerprint module calibration device according to claim 4, characterized in that, The at least two polarizers (204) include a first polarizer (2041), a second polarizer (2042), a third polarizer (2043), and a fourth polarizer (2044); A first polarizer (2041) is provided on the second side surface (212), a second polarizer (2042) is provided on the third side surface (213), a third polarizer (2043) is provided on the fifth side surface (242), and a fourth polarizer (2044) is provided on the sixth side surface (243). The first polarizer (2041), the second polarizer (2042), and the third polarizer (2043) are configured to control the on / off state of the first optical path structure (2021); The first polarizer (2041), the second polarizer (2042), and the fourth polarizer (2044) are configured to control the on / off state of the second optical path structure (2022); The first polarizer (2041), the second polarizer (2042), the third polarizer (2043), and the fourth polarizer (2044) are configured to control the on / off state of the third optical path structure (2023).

6. The fingerprint module calibration device according to claim 5, characterized in that, The second prism (22) also includes a first mirror (221); The image of the first pressing surface (2011) is transmitted through the first mirror (221) to the second polarizer (2042) and the third polarizer (2043), and then through the second polarizer (2042) and the third polarizer (2043) to the imaging surface (203); The third prism (23) also includes a second mirror (231); The image of the second pressing surface (2012) is transmitted through the second mirror (231) to the first polarizer (2041) and the fourth polarizer (2044), and then through the first polarizer (2041) and the fourth polarizer (2044) to the imaging surface (203); The image of the third pressing surface (2013) is transmitted to the imaging surface (203) through the third polarizer (2043), the fourth polarizer (2044), the first polarizer (2041), and the second polarizer (2042).

7. The fingerprint module calibration device according to claim 6, characterized in that, The first polarizer (2041) is configured to be turned on or off by an electrical signal; when the first polarizer (2041) is on, light passes through the first polarizer (2041); when the first polarizer (2041) is off, light cannot pass through the first polarizer (2041). The second polarizer (2042) is configured to be turned on or off by an electrical signal; when the second polarizer (2042) is on, light passes through the second polarizer (2042); when the second polarizer (2042) is off, light cannot pass through the second polarizer (2042). The third polarizer (2043) is configured to be turned on or off by an electrical signal; when the third polarizer (2043) is on, light passes through the third polarizer (2043); when the third polarizer (2043) is off, light cannot pass through the third polarizer (2043).

8. A fingerprint module calibration method, characterized in that, The fingerprint module calibration method employs the fingerprint module calibration device according to any one of claims 1-7, and the fingerprint module calibration method includes: At least two standard blocks (3) are pressed simultaneously onto different pressing surfaces (201) to form at least two pressing images on the different pressing surfaces (201); The at least two optical path structures (202) are configured such that when one of the optical path structures (202) is in the conducting state, the other optical path structures (202) are all in the disconnected state; The pressing image on the pressing surface (201) corresponding to the optical path structure (202) in the conducting state of the at least two pressing surfaces (201) is transmitted to the imaging surface (203); The fingerprint module (1) is calibrated using the pressing image on the imaging surface (203).

9. The method according to claim 8, characterized in that, The prism assembly (2) also has at least two polarizers (204); The configuration of the at least two optical path structures (202) such that when one optical path structure (202) is in the conducting state, the other optical path structures (202) are all in the disconnected state includes: When one of the at least two optical path structures (202) is in the conducting state by controlling one of the at least two optical path structures (202) through the at least two polarizers, the other optical path structures (202) are in the disconnected state.

10. The method according to claim 9, characterized in that, The at least two standard blocks (3) include a first standard block (301), a second standard block (302), and a third standard block (303); the at least two pressing surfaces (201) include a first pressing surface (2011), a second pressing surface (2012), and a third pressing surface (2013); the at least two optical path structures (202) include a first optical path structure (2021), a second optical path structure (2022), and a third optical path structure (2023); The at least two polarizers (204) include a first polarizer (2041), a second polarizer (2042), a third polarizer (2043), and a fourth polarizer (2044); When one of the at least two optical path structures (202) is in a conducting state controlled by the at least two polarizers, the remaining optical path structures (202) are all in a disconnected state, including: Turn on the first polarizer (2041), turn off the third polarizer (2043) and the second polarizer (2042), and control the first optical path structure (2021) to be in the conducting state, and the second optical path structure (2022) and the third optical path structure (2023) to be in the disconnected state; The second polarizer (2042) is turned on, the fourth polarizer (2044) and the first polarizer (2041) are turned off, the second optical path structure (2022) is controlled to be in the conducting state, and the first optical path structure (2021) and the third optical path structure (2023) are in the disconnected state. The first polarizer (2041), the second polarizer (2042), the third polarizer (2043), and the fourth polarizer (2044) are turned on, the third optical path structure (2023) is in the conducting state, and the first optical path structure (2021) and the second optical path structure (2022) are in the disconnected state.

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