TW200521874A - 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

200521874 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 more particularly to the use of the inertia of the finger to move the two patterns and Comparing sensor modules and methods. θ 0 ° [Prior art] The conventional fingerprint reader can be pressed on the paper with a finger that is stained with ink. #Using an optical scanner to scan the paper to insert the finger; in the brain, and then with the database At the same time, the grain pattern of level γ is compared. However, the biggest shortcomings of the above are that it can't achieve the goal of real-time processing. 赭 Belt electronic product security. Card authentication. E-commerce. Real-time fingerprint reader tr, security system, etc. Surgery. The traditional real-time fingerprint ^ key technology patents in the convenience identification market No. 4, 0 53, 22 8 and 1 methods are optical, please refer to the large and easily forged shadow in the United States # '340, 3 0 0, but its Has the disadvantage of being too bulky for this reason, using Shi Xiban $ to make up. The chip-type fingerprint sensor, which overcomes the above-mentioned optical sensing, came into being at the historic moment, and there are quite a few principles, such as the disadvantages of Zhou. Capacitive type, pressure type and chip type fingerprint sensor are disclosed in the following patent applications: serial number 0 9 1 1 0 68 0 6, Shenshe, inductive type, etc .: Apply to "Capacitive fingerprint reading chip tomorrow is April 3, 2002, the invention name is 009m0443, and the date is 20002"; 2nd middle: the Republic of China invention patent application case number fingerprint Read the chip and its potential 'May 17, 2007, the invention name is "pressure ^ method"; 3. · The Republic of China issued a monthly patent application ^

200521874 V. Description of the invention (2) Case number 0 9 0 1 1 3 7 55, application date 20 July 2001, the name of the invention is "Design and Manufacture of Temperature Difference Inductive Fingerprint Identification Chip", pending patent pending ; And 4. The Republic of China Invention Patent Application No. 091118142, the application date is August 13th, 2002, and the invention name is "Capacitive Pressure Micro-sensing Element and Application of Fingerprint Reading Chip Structure". However, due to the limitation of the size of the finger, in order to meet 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 larger than

9mmX9mm, the optimized area must be more than llmmX14mm. On the other hand, due to the limitations of silicon integrated circuit manufacturing technology, only dozens of effective chips can be produced in a 6-inch wafer, plus the cost of packaging and testing, which will make the cost of a single fingerprint sensor high. , It is not easy to be widely used in various consumer electronics (such as notebook computers, mobile phones, personal digital assistants, computer eyebrow products), and even personal identification cards with integrated fingerprint sensors, please inventor Zhou Zhengsanzhi Invention patent application number: 1 · Republic of China invention patent application number 0 92 1 0 5 5 9 9, application date is March 14, 2003, the name of the invention

It is called "card-type biometric device and method"; and 2. The Republic of China issued a patent application number 0 9 2 1 1 462 1. The application date is May 29, 2003. The name of the month is "with sliding Card device for fingerprint sensor ”. Therefore, the size of the fingerprint sensor is reduced to only a few iinear arrays. Generally, the effective crystal can be increased ^ ^ θ p. _ Reduce the wafer soap price. The principle is to complete the scanning of the entire finger by sliding the finger = 2 d ', and then concatenate each captured J spoon S image into a complete fingerprint.

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

200521874 V. Description of the invention (3) A method of stringent measurement and multiple image formation using pyroelectric (thermal) or piezoelectric material (pressure), which has the advantage of completing the image by the inertia of human-type fingerprint sense Capture without the need to slide with external fingers (such as an optical scanner). Its main disadvantage is that it is impossible to judge, and move the mechanism (examples, so it must capture a considerable number of images and then add a sliding speed image. This requires a powerful microprocessor and a large number of fingerprints to cause reorganization errors. . And the speed when the finger slides is easy to distinguish, especially when the finger is about to slide away from the fingerprint sensor, = will affect its sexual movement. In addition, the feature point ratio is used; 2J's f is strict and long-term use If you use large text, there are non-Yangu easy to identify because of a small mistake. Its products such as FlingerchipTM of the company have this disadvantage, and one of them: , S e 11 ak revealed another way in its World Patent Gazette. The private pattern sensor is a small area sensor (C, X, Y, and Y dimensions are smaller than the size of a finger) to help reduce chip costs. L, and the fingerprint capture and comparison can be divided into two parts. When the first-time user of the day guard must register several fragment fingerprints before and after, and recombine them into a composite fingerprint (larger than the sensor area) ). For subsequent use, the user only needs to place his finger on the sensor, and only capture a segment of finger, text, and compound fingerprint for comparison. Its advantage is that it does not require dynamic connection as described in the comparison, only static capture of segment images is needed, which simplifies the whole mechanism and therefore reduces costs. However, the disadvantage of this device and method is that the use of the fingerprint sensor during the first login is not based on the human nature (back and forth), but needs to educate users to log in.

200521874 V. Description of the invention (4) And Heyi ^ caused login failure. It is enough to formally use the recognition image, but it also loses its rigor. #That is, only capturing fragments is sufficient, and it is easy to cause under-sampling and misjudgment, which causes the use of the image: the pattern is not a problem. Its practical application products such as Authentec are inconvenient or have problems with AES-340 products, which has this disadvantage. U-35 00 or [invention factor and its cost. You can use the up and down directions of the module to capture the reset and reset criteria of the second segment of the fingerprint image. Fingerprint recognition content] Therefore, the fingerprint can be used to reach the upper limit of the fingerprint, and then the finger can be repeatedly transferred. Image; using fingerprints, fingerprints, and fingerprints, and invented a biometric authentication method that was successfully invented in the certificate, the authentication method in this record moves and continuously slides multiple segments to capture standard inventions , Including a first segment of a fingerprint of a moving or coming fingerprint and a fingerprint authentication image, comparing each second image, and then accumulating a plurality of images with a total total matching level greater than one 2:- Small-area fingerprint sensing solves the above problems and reduces and compares the segment fingerprint images with the same slip image; the image and the segment product in the formula each agree with a predetermined kind of small-area fingering steps. Sensing in a longitudinal pattern sensing The device moves through a fingerprint registration mode and stitches it into a composite 'arbitrarily capture the fingerprint image alone to the second segment level to obtain a threshold of total agreement Time, it is determined the measured cell array with a plurality of vertical fingerprint image storing Embodiment

Page 10 200521874

V. Description of the Invention (5) FIG. 1 shows a schematic diagram of a small-area fingerprint sensing boundary module according to the first embodiment of the present invention. The small-area fingerprint sensor module of the present invention includes a small sensor. Surface, the fingerprint sensor 10 and one of the microprocessors 20 electrically connected thereto. The small-area texture sensor 10 includes a silicon substrate 11, a sensing element array i 2, a processing circuit 14 and a plurality of solder pads 丨 5. The fingerprint sensor 丨 〇 is electrically connected to the microprocessor 2 through the pad 5. The microprocessor 20 may be located in a personal computer, a notebook computer, or other electronic equipment. The sensor element array 1 2 is located on the substrate]] 'and is composed of a plurality of fingerprint sensor elements (which can be capacitive sensor elements, capacitive pressure sensor elements, or temperature difference sensor elements) 3 in a two-dimensional array The arrangement is composed of a plurality of segment fingerprint images for sensing intermittent movement, continuous sliding or sliding back and forth through a finger on the sensing element array 丨 2 in a longitudinal direction γ. The processing circuit 14 is electrically connected to the sensing element array 12 and is used to process the fingerprint image of the fragment. The so-called intermittent movement means that the finger is placed on the sensor first, and after a period of time, the finger moves forward (—Y) or backward (+ γ) by a small displacement. The so-called ^ back sliding means that the finger is first placed on the sensor and moved back and forth on it. The so-called continuous sliding means that the finger is placed on the sensor and slides in a single direction.

Bu j. The area buckle sensor 10 has a speed / displacement sensing unit 12: 测 ::: The sliding speed / displacement of one of the fingers is used as the basis for sensing the bit array image. Speed / displacement sensing unit 18; on the soil plate 11 and composed of a first electrode plate i 6 and a first fish 箆 -lei 粍 you, π * β Le Yi electrode plate 1 7 households; predetermined distance 2 ί Ί Essentially parallel and spaced from each other — away. The detection electrode touches the first electrode plate 16 and the second electrode by mistake.

Page 11 200521874 V. Description of the invention (6) 1-7 One time difference 'can obtain the sliding speed according to the predetermined distance. Regarding the related architecture of the speed / displacement sensing unit 18, please refer to the Republic of China Patent Application No. 092113528 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 small-area fingerprint sensor of the present invention is that the lateral dimension W of the sensor element array 2 is at least greater than 9 mm, which is better in the embodiment of the present invention The dimension L is about 12 mm ′ and the longitudinal dimension L must be at least greater than 随. In the embodiment of the present invention, the preferred dimension is about 7 mm. That is, the small-area fingerprint sensor of the present invention has a sensing area of 12 mm X 7 mm (see the detailed description below), and the signal detected by the sensing unit is processed by the processing circuit and processed through the output / input. The bonding pad 15 communicates with the outside world. The processing circuit 14 basically includes a logic control circuit, an adjustable gain amplifier, and an analog digital to 1 converter, etc. For its related architecture, refer to the Republic of China Patent Application No. 0 9 1 1 0 6 80 6 of Zhou Zhengsan. The application date is April 3, 2002, the invention name / Lei '^ fingerprint sensor. " Standby 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 private k-direction dimension, no matter when the finger logs in for the first time or the next time, the inertial motion of the finger is used to capture the fingerprint. Class association

MaingUet in U.S. Patent No. 6,289,114 discloses the inertia of the finger 1 sliding in the direction. However, the spirit of the invention of this patent lies in that when the user logs in early in the morning, the user places his finger on the sensor, and can obtain a first-fragment fingerprint image 3 1 A due to two: text. Then, it moves with inertia. page

200521874 V. Description of the invention (7) The design of the appearance of the tool (such as the guide groove) uses the inertia to move the finger downward by a distance for the sensor element array 丨 2 to capture another fingerprint image of the first segment 31B. Since the fingerprint sensor of the present invention has a vertical dimension of about-in the γ direction, the present invention only needs to capture 2 to 3 fragment fingerprint images when logging in for the first time. In particular, in this embodiment, only two segment images are needed. Subsequently, the simplest method for establishing the two fragment fingerprint images 3 i α with Chuan is to re-combine a composite fingerprint image 3 1 C as a reference fingerprint image. Since the present invention uses a simple The inertial action and the pole-to-segment fingerprint capture action complete the registration action of the composite fingerprint image 31C, so the shortcomings of the above-mentioned invention patent can be overcome at the same time. In another embodiment of the present invention, a single login can capture multiple fingerprint images, and the mother-segment fingerprint images are completely independent to form a database, and there is no need to establish connectivity. FIG. 3 is a schematic diagram of a fingerprint authentication process according to the present invention. After completing the registration of the pattern image 31C or creating the fingerprint database of several fragments, the user can place his finger on the sensor during use, in order to increase the rigor of recognition and ease of use. The present invention also uses a human hand for comparison when using it. The difference is that after the finger is placed above the sensor, 'only two-way light movement is required (unlike the one-way sliding of the finger)'. The longitudinal dimension of the device's sensor is sufficient, and each individual second segment fingerprint image, such as 32A, 32B, that is randomly captured is independently manipulated and compared with the reference fingerprint image 3 1C, or Each individual second segment fingerprint image 32A, 32B, 32c cross-matches with multiple first segment fingerprint images in the database and accumulates each second segment fingerprint 200521874 V. Description of the invention (8) image The comparison of 32 A, 32B, and 32C is completed after the score reaches a predetermined safety value. Such comparison design takes into account the user's convenience and system safety to increase rigor. That is, after placing a finger on the sensor and sliding it up and down gently, as long as the distance of sliding up and down exceeds 3mm, it is equivalent to capturing fingerprints with a length of 13 (= 7 + 3 + 3) in the γ direction. The sensing dimension in the χ direction of 12 mm is sufficient. The effective area and comparison method of the fingerprint capturing method of the present invention has a more rigorous comparison standard than other small-area sensor devices. At the same time, the user only needs to gently slide up and down inertia during use, without any education and learning. # 纹 比 对 No need to connect the picture like a sliding sensor to avoid errors. At the same time, through the comparison of multiple second-segment fingerprint images 32A ~, 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 the small-area fingerprint sensor module and fingerprint registration authentication f method of the present invention. Please refer to FIGS. 1 to 4. The small-area fingerprint sensor module of the present invention is at the beginning (step 2 0) 4, that is, it is automatically determined whether a fingerprint needs to be registered, or the user selects whether to register a fingerprint (step 210). If you want to log in, the private print, this branch set operates in a fingerprint login mode (step 2 25). Yu Caiyue, Wenwen recording mode 'sensing element array 1 2 senses or reads a plurality of fragment fingers, and images and G # plurality of first fragment fingerprint images 3! A and 3 workers b ( Step 135. The processing circuit 14 processes these first segment fingerprint images 31 people and 31] 5. J: The process 2 2 0? These processed-segment fingerprint images 31A and 31 B are split into two The zigzag image 3 1 C is stored in the microprocessor 20 or is stored separately in U: 211 to establish a fingerprint image database (step 2 4 5). Therefore, the heart pattern image material The library contains stitches from the fingerprint images of the first fragments

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Page 14 200521874 V. The compound fingerprint image of the invention description (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 220). Then, the sensing element array 12 sequentially senses or reads the plurality of segment fingerprint images to obtain a plurality of second segment fingerprint images 32A to 32C (step 230). The processing circuit 14 processes these second segment fingerprint images 3 2A to 32C. The microprocessor 20 compares the processed second-segment fingerprint images 32A 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 Alignment with 3 1 B produces the coincidence level L 0 (step 2 4 0). Next, a plurality of coincidence levels L ο that 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 coincide 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 2 60), it is determined that the fingerprint authentication is successful (step 270), and the entire authentication The process ends (step 280). If L1 has not reached the predetermined threshold level L2, then continue to capture other fingerprint images of the second segment to repeat steps 2 3 0, 2 4 0 and 2 5 0. At this time, the old L 1 will be compared with the new one. The resulting 10 is accumulated to obtain new L1. For example, after the second segment fingerprint image 32A and the composite fingerprint image 3 1 C have 30 characteristic points, because it is smaller than the threshold level L 2 of, for example, 90, the second segment of the fingerprint image is continued. Fragment fingerprint image 3 2 b. If the second segment fingerprint image 32B and the composite fingerprint image 31C have 35 characteristic points, the accumulated L1 (3 0 + 3 5 = 6 5) is still less than L 2 at this time. Therefore, continue to capture the second segment fingerprint image 3 2 C. If the second segment fingerprint image 3 2 b coincides with the composite fingerprint image 3 1 C and there are 30 feature points, then the accumulated L 丨(6 5 + 3 0 2 95) is greater than L2, so it can be determined that the fingerprint authentication is successful.

Page 15 200521874 V. Description of the invention (10) Therefore, during this authentication process, ^ slide until the authentication is successfully notified as I = 2 = —The number of fingerprint images of straight forward and backward fragments is based on whether it is greater than 1 / ^ Yes, the second number can be two or more, and the second number of each acquisition: so the number of its images can be one or more. Slave Fingerprint Figure 5 shows a schematic diagram of a small area group according to a second embodiment of the present invention. This embodiment is similar to the first embodiment, that is, the speed sensor / displacement sensing unit is not equipped with one or a plurality of rollers. The place where the roller 19 is located outside the substrate 1 is the roller. 9 You can bring it with your finger, and the related structure can refer to the patent application of the Republic of China on Zhou Zhengsan = Zhuan, which

092 1 3248 1. The application date is November 20, 2003. The name of the invention is "a sliding fingerprint sensing device that can guide the sliding direction of a finger". By using the cumulative matching level to determine the number of captured fingerprint images, and by allowing users to slide their fingers in both directions to capture and compare fingerprints, the entire authentication process can be made more convenient. And smooth. The specific embodiments proposed in the detailed description of the preferred embodiments are only for the convenience of explaining 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 spirit of the present invention and the following applications The scope of the patent and the various changes made are all within the scope of the present invention.

Page 16 200521874 Brief description of drawings Figure 1 shows the schematic diagram of a small area fingerprint sensor module according to a first embodiment of the present invention. Figure 2 shows the schematic diagram of the fingerprint registration process of the present invention. Figure 3 shows the schematic diagram of the fingerprint authentication process of the present invention. Figure 4 shows the flowchart of the small-area fingerprint sensor module set of the present invention and the fingerprint registration certification method. FIG. 5 shows a schematic diagram of a small area fingerprint sensor module according to a second embodiment of the present invention. [Explanation of Symbols] L ~ Vertical dimension W ~ Horizontal dimension 10 ~ Fingerprint sensor 11 ~ Substrate 12 ~ Sensor element array 13 ~ Fingerprint sensor element 14 ~ Processing circuit 15 ~ Pad 16 ~ First electrode plate 17 ~ Second electrode plate 18 ~ Speed / displacement sensing unit 19 ~ Roller 20 ~ Microprocessor 31 A 31B ~ First segment fingerprint image 31 C ~ Composite fingerprint image 32A-32C ~ Second-slice fingerprint image丨 Like 2 1 0-2 8 0 ~ steps

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Claims (1)

200521874 VI. Scope of patent application 1. A small-area fingerprint sensor module, including: a microprocessor; and a small-area fingerprint sensor, which is electrically connected to the microprocessor, and includes: a substrate; The sensor element array is located on the substrate and is composed of a plurality of fingerprint sensor elements arranged in a two-dimensional array to sense intermittent movement, continuous sliding, or back and forth movement in a longitudinal direction. Fingerprint image of a plurality of fragments of a finger on the sensing element array; and A processing circuit electrically connected to the sensing element array for processing the fingerprint images of the fragments, wherein: in a fingerprint registration mode, the sensing element array senses the fingerprint images of the fragments to obtain a plurality of fingerprint images. The first segment fingerprint image, the processing circuit processes the first segment fingerprint images, the microprocessor builds the processed first segment fingerprint images into a fingerprint image database and stores in the microprocessor In; 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 segment fingerprint image is independently compared with the fingerprint image database stored in the microprocessor, and a plurality of second image segments that are in agreement 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, 200521874 VI. Patent application scope 2. The small-area fingerprint sensor module described in item 1 of the scope of patent application, wherein the small-area fingerprint sensor has a speed / displacement sensing unit for detecting The sliding speed / displacement of one of the fingers is used as a basis for the sensing element array to sense the fingerprint images of the fragments. 3. The small-area fingerprint sensor module according to item 2 of the scope of patent application, wherein the speed / displacement sensing unit is located on the substrate and is composed of a first electrode plate and a second electrode plate The first and second electrode plates are substantially parallel to each other and separated by a predetermined distance. By detecting a time difference between the contact of the finger with the first electrode plate and the second electrode plate, the sliding can be obtained according to the predetermined distance. speed. 4. The small-area fingerprint sensor module according to item 2 of the scope of patent application, wherein the speed / displacement sensing unit is a roller, which is rotated by the finger. 5. The small-area fingerprint sensor module according to item 1 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. 6. The small-area fingerprint sensor module according to item 1 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 cm. 7. The small-area fingerprint sensor module according to item 1 of the scope of patent application, wherein in the fingerprint registration mode, the number of fingerprint images of the first fragments is at least equal to two. 8. The small-area fingerprint sensor module described in item 1 of the scope of patent application, wherein in the fingerprint authentication mode, the fingerprint images of the second fragments are Page 19 200521874 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, including the following steps: sensing the intermittent movement in a longitudinal direction, continuous sliding or sliding back and forth through a plurality of fingers on a sensor element array A fragment fingerprint image; 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 Image, and using a microprocessor to build the processed first segment fingerprint images into a fingerprint image database and store in the microprocessor; and in a fingerprint authentication mode, using the sensing element array Randomly extracting the fingerprint images of the fragments to obtain a plurality of fingerprint images of the second fragments. Page 20 200521874 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 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 according to item 13 of the scope of patent application, wherein the fingerprint image database includes Page 21 200521874 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