TWI229296B - Small-area fingerprint sensor module and fingerprint enrollment and verification method therefor - Google Patents

Abstract

A fingerprint enrollment and verification method for a small-area fingerprint sensor module includes the steps of: sensing a plurality of fingerprint fragment images of a finger that intermittently moves, continuously slides or slides back and forth across the sensor surface in a longitudinal direction; capturing a plurality of first fingerprint fragment images to form an independent fragment images database or stitch them into a composite fingerprint image in an enrollment operation; and randomly acquiring a plurality of second fingerprint fragment images and comparing them to the stored images database or the composite fingerprint image, respectively, during a fingerprint verification process, and then accumulating each second fragment image matching level with the independent fragment images database or the composite fingerprint image to obtain a total match level. When the total match level is greater then a predetermined threshold level, it is judged that the fingerprint authentication succeeds.

Description

1229296 V. Description of the invention (1) --- [Technical field to which the invention belongs] The present invention relates to a small-area fingerprint sensor module and a fingerprint registration authentication method thereof, and in particular, to use the inertia of finger movement to perform ^ print = A sensing module and method for obtaining and comparing. [Prior art] The conventional fingerprint reading method can use an ink-soaked finger to press on the paper, and then use an optical scanner to scan the paper to rotate the fingerprint into the computer, and then compare it with the fingerprint pattern in the database. . However, the biggest disadvantage of the S method is that it cannot achieve the purpose of real-time processing, so it cannot meet the needs of more and more instant authentication, such as: network authentication, e-commerce, confidentiality of portable electronic products, and IC card personal identity authentication. , Security systems, and so on. Two instant fingerprint reading methods have become key technologies in the biometrics market. The traditional real-time fingerprint reading method is optical. Please refer to US Patent Nos. 4, 0 53, 2 2 8 and 4, 340, 3 0 0. However, it has the disadvantage of being too bulky and easily deceived by fake images. . For this reason, a wafer-type fingerprint sensor using Shixi Semiconductor came into being, which overcomes the shortcomings of the above-mentioned optical sensor. Chip-based fingerprint sensors have quite a few sensing principles, such as capacitive, pressure, and thermal sensors disclosed by Zhou Zhengsan and others in the following patent applications: 1. The Republic of China Patent Application No. 091106806, the filing date is "April 3, 2002, the invention name is" Diangu-style fingerprint entry chip "; 2 · Republic of China invention patent application Ί 0 9 1 1 1 0 443, application date May 17, 2002 , The invention name is "pressure = fingerprint reading chip and its manufacturing method"; 3. Republic of China invention patent application X please

1229296

Case No. 090113755 'Application date: July 6, 2001. The name of the invention is "Design and Manufacturing of π-Differential Inductive Fingerprint Identification Chips", and the patent is pending; and: The Republic of China Invention Patent Application No. 0 9 1 1 1 8 1 42, the application date is August 13, 2002, the invention name is "Capacitive pressure micro-sensing element and its application 4 fingerprint structure". However, due to the limitation of the size of the finger, in order to achieve strict authentication standards, that is, it is not prone to misjudgment and polyjudgment, the sensing area of the conventional chip-type fingerprint sensor is at least greater than 9mm × 9mm. The optimized area must be more than llmmX14min. On the other hand, due to the limitations of silicon integrated circuit manufacturing technology, only dozens of effective wafers are placed in a 6-inch wafer, plus the cost of packaging and testing, which will make the cost of a single% texture sensor high. It is not easy to popularize it in various consumer products: electronic products (such as notebook computers, mobile phones, personal digital assistants, electronic products), and even personal identity of integrated fingerprint sensors: the invention patent of the second inventor Zhou Zhengsan tPlease refer to the case number of Qingshenli Application No. 0 92 1 0 5 59 9, the application date is March 14, 2003, Invention 1 is "Card-type biometric device and method"; and 2. Patent issued by the Republic of China The application number is 092114621, and the application date is May 29, 2003. The "month f" is called "Card Device with Sliding Fingerprint Sensor". Therefore, one-dimensional size of a traditional two-dimensional wafer-type fingerprint sensor is reduced to only a few sensor elements, such as a linear array of inductive sensors (1 ineararray), which can increase the number of effective wafers. . The principle is to slide the finger across the surface of the chip to complete the scanning of the entire finger, and then concatenate each captured image into a complete fingerprint.

Mai nguet disclosed in U.S. Patent No. 6, 28, 9, 1 1 4

1229296 V. Description of the invention (3) _____ = sliding method formed by pyroelectric (thermal) or piezoelectric material (pressure), _two multiple image concatenation method, which has the advantage of using the human body ^ two texture, = sex Complete the image capture without the need for an external drive (swipe the optical scanner). The main disadvantage is that it is impossible to determine the structure of the finger (for example, f), so a large number of images must be captured and the speed of re-moving must be acquired. A powerful microprocessor and a large amount of memory are required. Reorganization error. And the speed and jitter when the finger slides are :: Easy 1, especially when the finger is about to slide away from the fingerprint sensor, there will be plus = θ. It is also used for fingerprint identification by feature point comparison. ; The advantages of the habitual rigor of 1 and the stability of long-term use. If a large number of ^ / are used, there is a small error that is not ¥¥ easy to cause the identification failure. The actual response should be equal to 1: 1 ^ 1 of the company 1 ^ 11 to 1 ^ 1 ^ 1) 1 ^, which has this disadvantage. ^ In order to improve this shortcoming, Se 11 ak disclosed another device in its world patent VIII W00 0 68 87 3, whose fingerprint sensor is: = (the X and y dimensions are smaller than the size of a finger) To help reduce costs. The fingerprint capture and comparison can be divided into two parts. When using: a, the user must register several fragment fingerprints before and after: and ^ = recombination to form a composite fingerprint (larger than the sensor area) . Then, the user only needs to place his finger on the sensor, and only capture the ^ = pattern and compare it with the original composite fingerprint. The advantage is that the ratio must be dynamically connected as described above, and only the static segment image needs to be captured, which reduces the entire mechanism and therefore reduces costs. However, the disadvantage of this method is that when the texture sensor is first registered, the inertia of the texture sensor (front, back, left, and right) needs to be educated to the user.

Page 9 1229296 V. Description of the invention --- ^ 影 i ϊ 欵 Login failed. In the formal use of recognition, although only the film p is sufficient, Rong Ke 'also loses its rigor, that is, the captured fingerprint image is not wrong.不足 Insufficient sampling results in misjudgment, causing inconvenience in use or interrogation. AES-34 (internationally applied products such as AES ~ 35 00 or ° products of AUthenteC company) has this shortcoming. [Invention of the device and its nature. It can be used at an advantageous time It is up and down in the direction of the module. Take a copy of the fragment of the fingerprint image and the reset standard. Specify the content] A, this refers to the use of the human hand to achieve the strict ^ into the fingerprint to continue to move the fingers to take multiple images ; Using fingerprints, fingerprints, and fingerprints for the purpose of inertially dense biometrics for a recording authentication method that was successfully invented by the card, this recording authentication method moves and continuously slides a number of first segments and a fingerprint image, And compare each image, the total matching level of the image matching is based on the standard invention, including moving or coming fingerprint fingerprint authentication mode one or two, and then a number of greater than ~ to provide solutions and Provides the following slide-back image; than, the segment product in the formula is consistent with the predetermined kind of small area fingerprint to sense the above problems and reduce the paired fragment fingerprint image to the same kind of small area. Step: The sensing pattern is moved in a longitudinal direction through a sensor element array in a fingerprint registration mode and stitched it. 'Arbitrarily capture the fingerprint image alone to obtain the fc of the second segment level? » , It is determined that the composite plurality of first and second fingerprints are in total agreement with the stored fingerprint image.

1229296 V. Description of the invention (5) Fig. 1 shows a schematic diagram of a small-area fingerprint sensor module according to the first embodiment of the present invention. The small-area fingerprint sensor module of the present invention includes a small-area fingerprint sensor 10 and a microprocessor 20 electrically connected thereto. The small-area fingerprint sensing 10 includes a broken substrate 11, a sensing element array 12, a processing circuit 14, and a plurality of pads 15. The fingerprint sensor 10 is electrically connected to the processed 20 through the pad 15. Microprocessor | §20 can be located on a personal computer, laptop or other electronic device. Array of sensing elements 丨 2 are located on the substrate], and are composed of a plurality of fingerprint sensing elements (can be capacitive sensing elements, capacitive pressure sensing elements or temperature difference sensing elements) 1 3 arranged in a two-dimensional array It is configured to sense a plurality of fragment fingerprint images that move intermittently, continuously slide, or slide back and forth through a finger on the sensing element array i 2 in a longitudinal direction γ. The processing circuit 14 is electrically connected to the sensing element array 12 to process the fingerprint image of the segment. The so-called intermittent movement means that the finger is placed on the sensor first, and then moves forward (-Y) or backward (+ Y) by a small displacement after a period of time. The so-called = slide back 'means that the finger is first placed on the sensor, and moved back and forth on the sensor. The so-called continuous sliding means that the finger is placed on the sensor and the condition = sliding in one direction. / σ Early In addition, the 'small-area fingerprint sensor 10 has a speed / displacement sensor', which is used to detect the sliding speed / displacement amount of one of the fingers as =, 1: the basis for sensing the fingerprint images of these fragments. Speed / bit residual ;: single: two:, on the soil plate 11, and is predicted by a first electrode plate 16 and a one y, the first and second electrode plates 16 and 17 substantially each other .... By detecting that the finger touches the first electrode plate 16 and == 1229296 V. Description of the invention (6) " One time difference of 1 7 ', the sliding speed can be obtained according to the predetermined distance. Regarding the related architecture of this speed / displacement sensing unit 丨 8, please refer to the Republic of China Patent Application No. 0 92 1 1 352 8 by Zhou Zhengsan, the application date is May 20, 2003, and the invention name is “Sliding Fingerprint sensor module and its sensing method ". In order to match the size of the finger and meet strict biometric standards, the biggest feature of the invention's small-area fingerprint sensor is that the sensor element array M has a dimension κ to W greater than 9 mm. In the embodiment of the present invention, The preferred size is about 12 mm, and the longitudinal size [must be greater than 6 mm. In the embodiment of the present invention, the size is about 7 mm. That is, the sensing area of the small-area fingerprint sensor of the present invention is 12mm x 7mm (see the detailed description below), and the signal sensed by the sensor is processed by the processing circuit and processed through the output / input. Know the bonding pad 15 and communicate with the outside world. The processing circuit 14 basically includes a logic control circuit, an adjustable gain amplifier, and an analog-to-digital converter. For reference, please refer to Zhou Zhengsan's Republic of China Patent Application No. 2. Shen Qiao said April 3, 2002. The name of the invention is " Capacitive fingerprint sensor ”. Valley type Figure 2 shows a schematic diagram of the fingerprint registration process of the present invention. Because the design concept of the small fingerprint sensor in the present invention is that its lateral dimension w can include the k-direction dimension of the hand, the finger uses the inertial motion of the finger to move up and down regardless of the first login or subsequent comparison. Fingerprinting is similar to the inertia of a finger sliding in one direction similar to that disclosed by Mainguet in US Patent No. 6,289,114. However, the spirit of the invention of the patent lies in that when the fingerprint is registered, the user places his finger on the sensor, and can obtain a first segment fingerprint image 31A. Then, with inertia or °

Page 12 1229296 V. Description of the invention (7) The design of the precise appearance mold (moving down the distance for the remaining 'then two fish to guide the groove') uses the inertia to make the fingers face the image 3 i B.丨 Yu Ben / Ming; V take another first segment and refer to ^ ^^ # Λ ^ ^ fingerprint image. In particular, you only need to capture 2 to 3 clips. Subsequently, only two fragments are needed in the sequence of ^, and the simplest is: 法 method; segment; “Like 31A, create a few fragment fingerprints to move; ::; = single inertia action and pole- In the embodiment, the disadvantages of the first solution are as follows. In the present invention, the fragment fingerprint image of each-fragment fingerprint image sheet is related. The built-in database does not need to be built as shown in Figure 3. The fingerprint image of the invented fingerprint authentication process 3Η: After login or the creation of several pieces of fingerprint database, the user can place his finger on the sensor during use, and it increases the rigor of identification. Degree and ease of use, the present invention also uses the inertial movement of the human hand for comparison. The difference is that after the finger is placed above the sense, it only needs to move back and forth gently in two directions (unlike the finger's one-way sliding). Because the longitudinal dimension of the sensor of the device of the present invention is sufficient, each individual first segment fingerprint image captured arbitrarily, for example, 3 2 A, 3 2 B, 3 2 C, is independently captured and compared with the reference fingerprint. Image 3 1 C for area comparison, or each A second segment alone fingerprint image 32A, 32B, 32C, respectively, and a plurality of first segment database cross reference fingerprint image and a second segment of each fingerprint cumulative

1229296 V. Description of the invention (8) --- The comparison of images 32 A, 32 B, and 32C has not been completed until the score of a predetermined safety value has been achieved. Such a comparison design takes into account the user's convenience and connection. Eryi 'Ding, Peach's safety to increase rigor. That is, after placing the finger on the sensor and sliding it down gently, as long as the distance of sliding up and down is more than 3mm, wait for the fingerprint in the γ direction to capture a fingerprint with a length of 13 mm (= 7 + 3 + 3). Zuo Zhi's sense of X direction is 12 mm. The fingerprint of the present invention is willing to take an effective area and comparison method. Compared with other small-area sensor devices, the fingerprint has a more rigorous comparison standard. When the door is in use, the user only needs to slide up and down gently with inertia, without any education and learning. Fingerprint comparison does not need to be connected to the slide sensor, 2 to avoid errors. At the same time, through the comparison of multiple second-segment fingerprint images 3 2A, 32B, and 32C (for example, 32A, 32B, and 32C are all successfully compared), the disadvantages of the aforementioned Set lak invention can be avoided. FIG. 4 shows a flowchart of a small-area fingerprint sensor module and a fingerprint registration authentication method of the present invention. Please refer to Figures 丨 to 4. After the small-area fingerprint and sensor module of the present invention is started (step 200), it is automatically determined whether a fingerprint is required to be registered or the user selects whether to register a fingerprint (step 2 丨〇). If you want to register the pattern, this module will work in a fingerprint registration mode (step 2 2 5). In the fingerprint registration mode, the sensing element array 丨 2 senses or reads a plurality of fragment fingerprint images to obtain a plurality of first fragment fingerprint images 3 丨 A and 3} β (step 235) ° the processing circuit 14 processes this Wait for the first segment fingerprint image 31 and 3] ^. The micro-processing ram 20 stitches the processed first fragment fingerprint images 31A and 31β into a composite fingerprint image 3 丨 c and stores it in the microprocessor 20 or independently stores it in the microprocessor 20 to establish A fingerprint image database (step 24 5). Therefore, the ‘fingerprint image poor material library’ is composed of the fingerprint images of the first fragments.

Page 14 1229296 V. The compound fingerprint image of the description of the invention (9), or the fingerprint image of the first fragment independently. If there is no need to register fingerprints, this module operates in fingerprint authentication mode. First, the total coincidence level L1 is set to zero (step 2 2 0). Then, the element array 12 sequentially senses or reads the plurality of segment fingerprint images to obtain a plurality of second segment fingerprint images 3 2 A to 3 2 C (step 2 3 0). The processing circuit 4 processes these second segment fingerprint images 3 2A to 32C. The microprocessor 20 compares the processed second segment fingerprint images 3 2A to 32C with the composite fingerprint image 3 1 C stored in the microprocessor 20 or independently compares with each first segment fingerprint image 3 1 a is compared with 3 1B to generate a coincidence level L0 (step 240). Next, a plurality of coincidence levels L 0 that are in agreement with each second segment fingerprint image 3 2 A to 3 2 C and the composite fingerprint image 3 1 C or each first segment fingerprint image 3 1 A and 3 1 B are accumulated. A total anastomosis level L1 is obtained (step 25 0), and when the total anastomosis level L1 is greater than a predetermined threshold level L2 (step 26 0), it is determined that the fingerprint authentication is successful (step 27 0), and the entire # 忍The verification process ends (step 280). If L 1 has not reached the predetermined threshold level L2, then continue to capture the fingerprint image of the other second segment to repeat steps 230, 2 40 and 2 50. At this time, the old L1 will accumulate with the newly generated L0. To get the new L1. For example, when the second segment fingerprint image 3 2 A and the composite fingerprint image 3 1 C match 30 feature points, because it is less than the threshold level L 2 of, for example, 90, it continues to capture Take the second fragment fingerprint image 3 2 B. If the second segment fingerprint image 3 2 B and the composite fingerprint image 3 1 C have 35 feature points, the accumulated L 1 (3 0 + 35 = 65) is still less than L2. Therefore, continue to capture the second segment fingerprint image 3 2 C. If the second segment fingerprint image 3 2 B and the composite fingerprint image 31C have 30 characteristic points, the accumulated Ll (6 5 + 3 0 = 95) is greater than L2 ', so it can be judged that the fingerprint authentication is successful.

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V. Description of the invention (10) Therefore, during this authentication process, I slide until the authentication is successfully notified. Alas, the second number can be determined by two or more than two, so the number of its images can be two or two of the second segment fingerprint of the mother-human plum taken from the non-ethical data. • This The schematic diagram of the small area fingerprint sensor module according to the second embodiment of the invention. In this embodiment, the first sound is provided by ^ ^, n H, ^ 4 by a number of hard rollers 19, which is found in ί; 11 '' roller 19 can be rotated by fingers, its 0 92 3 ^ 481% =] On November 20, T, the invention was titled "Sliding Fingerprint Sensing Device that Can Guide the Direction of the Hand ^ β Movement". Μ = "The number of captured fingerprint images of the fragments is accumulated in a consistent way, and by allowing users to slide their fingers in both directions to capture and compare fingerprints," the entire authentication process is more convenient. And smooth. The specific embodiments proposed in the detailed description of the preferred embodiments are only for the convenience of clarifying the technical content of the present invention, rather than limiting the present invention to the above-mentioned embodiments in a narrow sense, without exceeding the present invention. The spirit of the patent application and the scope of the following patent applications, and the implementation of various changes, all belong to the scope of the present invention.

1229296 Brief description of the diagram Figure 1 shows the unintended intention of the small area fingerprint sensor module according to the first implementation of the present invention. Figure 2 shows a schematic diagram of the fingerprint registration process of the present invention. Figure 3 shows a fingerprint identification process of the present invention. Figure 4 shows a schematic view of the process. Figure 4 shows the small area fingerprint sensor module of the present invention and its fingerprint. Flowchart of Login Authentication Method () FIG. 5 shows a schematic diagram of a small-area fingerprint sensor module according to the second embodiment of the present invention. [Description of Symbols of Components] L ~ Longitudinal size 'Horizontal size 10 ~ Fingerprint sensor 11 ~, Substrate 12 ~ Sensor element array 13 ~, Fingerprint sensor element 14 ~ Processing circuit 15-'Solder pad 16 ~ First electrode Plate 17 to second electrode plate 18 to speed / displacement sensing unit 19 to scroll wheel 20 to microprocessor 3 L, 31B to first fragment fingerprint image

3 1C ~ composite fingerprint image 32 A-3 2C ~ second fragment fingerprint image 2 1 0-2 8 0 ~ steps,

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Claims (1)

1229296 VI. Scope of patent application 1 · A small-area fingerprint sensor module, including: a microprocessor; and a package—a small-area fingerprint sensor, which is electrically connected to the microprocessor includes: ”a substrate; ^ = Sensing element array, which is located on the substrate, and is composed of a plurality of fingers, ,, and sensing elements arranged in a one-dimensional array to sense 'moving and continuous in a longitudinal σ direction. Swipe or slide back and forth through a plurality of fragment fingerprint images of a finger on the sensing element array; and ^ Punching a processing circuit 'which is electrically connected to the sensing element array to process the fingerprint image of the special segment, where: In a fingerprint login mode, the sensing element array senses the segments referring to: A plurality of first segment fingerprint images are obtained by one image. The processing circuit processes a segment fingerprint image, and the microprocessor builds the processed first segment fingerprint images into a fingerprint image database. And stored in the microprocessor; and In a fingerprint authentication mode, the sensing element array arbitrarily captures the segment fingerprint images to obtain a plurality of second segment fingerprint images. The processing circuit processes the second segment fingerprint images, and the microprocessor will Each processed second fragment fingerprint image is independently compared with the fingerprint image database stored in the microprocessor, and a plurality of the second fragment fingerprint images that coincide with the fingerprint image database are accumulated. Each anastomosis level obtains a total anastomosis level, and when the total anastomosis level is greater than a predetermined threshold level, it is determined that the fingerprint authentication is successful. Page 18, 1229296 VI. Applying for the patent scope of the sensation group ________ 2. If the scope of the patent application is applied for !, where the small-area fingerprint sensor has an area fingerprint sensor module to detect the The sliding speed / bit speed / displacement sensing unit of one finger measures the basis of fingerprint images of these fragments. Even the amount is used as the sensing element array. 3. As requested in the scope of patent application No. 2, where the speed / displacement sensing unit and the small area fingerprint sensor model are in one position—the imperial system is located on the substrate. , And is composed of a first electrode plate and a younger one electrode plate, and a younger brother, "the rod m = constitutes, the first and second electrode plates of the stomach are solid; e.g. Detect that the finger touches the difference between the day and the day of 士 sores, and the sliding speed can be obtained according to the predetermined distance. 4 Small area fingerprint as described in the second patent application scope μ, +, ^ ^ ^ ^ Sensor mode, J: In the speed / displacement sensing unit, the inflammation / ', flat 70 series is a roller, which is rotated by the hand. 5 · 如 申 、 明 专 # 利 fc 围 第 1 The small-area fingerprint sensor module described in item 1, wherein the lateral size of one of the sensing arrays is substantially greater than or equal to g. 06 • If applied, please refer to the small-area fingerprint described in item 1. A sensor module, wherein a longitudinal dimension of one of the sensing arrays is substantially greater than or equal to 6 mm. 7. As described in item 1 of the scope of patent application The small-area fingerprint sensor module, in which the number of fingerprint images of the first segment is at least equal to 2 in the fingerprint registration mode. 8. The small-area fingerprint sensing as described in item 1 of the scope of patent application Device module, in the fingerprint authentication mode, the fingerprint images of the second fragments ---- ^ 1229296 VI. The scope of patent application is at least 2. 9. The small-area fingerprint sensor module according to item 1 of the scope of patent application, wherein each of the fingerprint sensing elements is a capacitive sensing element, a capacitive pressure sensing element, or a temperature difference sensing element. 10. The small-area fingerprint sensor module according to item 1 of the patent application scope, wherein the processing circuit basically includes a logic control circuit, a variable gain amplifier, and an analog-to-digital converter. 11. The small-area fingerprint sensor module according to item 1 of the scope of patent application, wherein the fingerprint image database includes a composite fingerprint image stitched from the first segment fingerprint images. 12. The small-area fingerprint sensor module according to item 1 of the scope of the patent application, wherein the fingerprint image database contains the independent first segment fingerprint images. 13. A fingerprint registration authentication method for a small-area fingerprint sensor module, comprising the following steps: sensing intermittent movement in a longitudinal direction, continuous sliding or sliding back and forth through a plurality of fingers on a sensing element array Fragment fingerprint images; in a fingerprint registration mode, sensing the fragment fingerprint images with the sensing element array to obtain a plurality of first fragment fingerprint images, and processing the first fragment fingerprint images with a processing circuit And using a microprocessor to build the processed first fragment fingerprint images into a fingerprint image database and store them in the microprocessor; and in a fingerprint authentication mode, using the sensing element array to arbitrarily The fingerprint images of these fragments are captured to obtain a plurality of fingerprint images of the second fragments. Page 20 1229296 VI. The patent application circuit processes the second fragment fingerprint images, and the microprocessor separates the processed second fragment fingerprint images from the fingerprint image stored in the microprocessor. The image database for comparison, and accumulate a plurality of anastomosis levels of the second segment fingerprint image and the fingerprint image database to obtain a total anastomosis level, and the total anastomosis level at gold is greater than a predetermined threshold. When the limit is reached, it is determined that the fingerprint authentication is successful. 14. The fingerprint registration authentication method for the small-area fingerprint sensor module as described in item 13 of the scope of patent application, further comprising the following steps: Detecting the sliding speed / displacement of one of the fingers as the sensing element array Basis for sensing fingerprint images of these fragments. 15. The fingerprint registration authentication method for the small-area fingerprint sensor module as described in item 13 of the scope of patent application, wherein a lateral dimension of one of the sensing element arrays is substantially greater than or equal to 9 mm. 16. The fingerprint registration authentication method for the small-area fingerprint sensor module described in item 13 of the scope of patent application, wherein a longitudinal dimension of one of the sensing element arrays is substantially greater than or equal to 6 mm. 17. The fingerprint registration authentication method for the small-area fingerprint sensor module described in item 13 of the scope of patent application, wherein in the fingerprint registration mode, the number of fingerprint images of the first segment is at least equal to two. 18. According to the fingerprint registration authentication method of the small-area fingerprint sensor module described in Item 13 of the scope of patent application, in the fingerprint authentication mode, the number of fingerprint images of the second segment is at least two. 19. The fingerprint registration authentication method for the small-area fingerprint sensor module as described in item 13 of the scope of patent application, wherein the fingerprint image database includes 1229296 VI. Scope of patent application One of the first fingerprint image stitching is a composite fingerprint image. 20. The fingerprint registration and authentication method for the small-area fingerprint sensor module according to item 13 of the scope of the patent application, wherein the fingerprint image database contains independent fingerprint images of the first fragments. Page 22