CN104408410B - The sensing unit scan method and its fingerprint identification method of fingerprint Identification sensor - Google Patents
The sensing unit scan method and its fingerprint identification method of fingerprint Identification sensor Download PDFInfo
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Abstract
The present invention relates to fingerprint recognition fields, disclose a kind of the sensing unit scan method and its fingerprint identification method of fingerprint Identification sensor.The sensing unit scan method of fingerprint Identification sensor in the present invention, comprises the steps of：A. simultaneously scan work at present sensing unit and its surrounding several sensing units, obtain scanning result；B. according to preset order find next sequential working sensing unit and its surrounding several sensing units；C. step A and B are repeated, until the sensing unit of needed work is scanned.The sensing unit number scanned simultaneously with the sensing unit of work at present can be increased, expand the sensing area scanned every time, by improving the scan method of sensing unit, increases the sensing area scanned every time, the sensitivity of fingerprint Identification sensor is improved, user experience is improved.
Description
Technical Field
The invention relates to the field of fingerprint identification, in particular to a sensing unit scanning method of a fingerprint identification sensor and a fingerprint identification method thereof.
Background
Fingerprint identification technology is a high-tech technology developed recently. Fingerprint identification is a technology for identifying the identity of a human body by taking a fingerprint as a 'live identity card' or a special seal carried with the human body by utilizing the uniqueness and invariance physiological characteristics of the human body.
The existing fingerprint detection relies on the unevenness of the fingerprint, namely the difference between the valleys and the ridges on the fingerprint, and the capacitance value variation generated between a detection electrode and the finger is utilized in the moving process of the finger, so that the fingerprint pattern is extracted.
At present, the induction area of the mainstream fingerprint identification sensor is generally directly used as the induction area by a chip, a plurality of induction units are arranged in the induction area for scanning, and on the premise of controlling the manufacturing cost of hardware, the area of the induction area is generally reduced for reducing the manufacturing cost of the chip. The detection principle of the fingerprint detection sensor is that firstly, fingerprint information of a detector is input, then a fingerprint general chart is stored, the stored fingerprint general chart is a pre-stored fingerprint chart, and the input fingerprint chart is matched with the pre-stored fingerprint chart. The input process of the fingerprint general graph is generally input for multiple times, fingerprints in different areas of the finger are input every time, then the fingerprints are spliced into the whole fingerprint general graph of the finger, and the general graph is stored as a matched picture. In each subsequent detection process, only one fingerprint is recorded, namely a small part of fingerprint patterns of the finger are recorded and then matched with the total fingerprint pattern.
When the method is applied to portable mobile equipment, the manufacturing cost of hardware is particularly important to control, so that the area of an induction area can be continuously reduced, and finally unlocking can be realized by inputting for many times, so that the time of fingerprint identification is greatly prolonged, the sensitivity of a fingerprint identification sensor is reduced, and the user experience is reduced. If the conventional solution is adopted, the hardware cost is increased by increasing the sensing area to ensure the fingerprint identification speed.
Disclosure of Invention
The invention aims to provide a sensing unit scanning method of a fingerprint identification sensor and a fingerprint identification method thereof, which increase the sensing area of each scanning, improve the sensitivity of the fingerprint identification sensor and improve the user experience.
In order to solve the above technical problem, an embodiment of the present invention provides a sensing unit scanning method for a fingerprint sensor, including:
A. simultaneously scanning the currently working induction unit and a plurality of induction units around the currently working induction unit to obtain a scanning result;
B. finding out the induction unit working in the next time sequence and a plurality of induction units around the induction unit according to a preset sequence;
C. and repeating the steps A and B until all the induction units to be operated are scanned.
The embodiment of the present invention further provides a fingerprint identification method of a fingerprint identification sensor, including the above sensing unit scanning method, further including the following steps:
and B, fingerprint matching is carried out according to the scanning results obtained in the step A.
The embodiment of the present invention further provides another fingerprint identification method of a fingerprint identification sensor, including the above sensing unit scanning method, further including the following steps:
calculating to obtain the scanning result of each sensing unit according to the scanning result obtained in the step A;
and matching the fingerprints according to the scanning results of the sensing units.
The embodiment of the invention also provides a sensing unit scanning circuit of a fingerprint identification sensor, which comprises:
the scanning module is used for simultaneously scanning the currently working sensing unit and a plurality of sensing units around the sensing unit to obtain a scanning result;
the searching module is used for finding the sensing unit working at the next time sequence and a plurality of sensing units around the sensing unit according to a preset sequence;
and the judging module is used for triggering the scanning module until all the induction units to be worked are scanned.
An embodiment of the present invention further provides a fingerprint recognition sensor, including: the sensing unit scanning circuit of the fingerprint identification sensor further comprises a matching unit for matching fingerprints according to each scanning result obtained by the scanning module.
Embodiments of the present invention also provide another fingerprint recognition sensor, including: the sensing unit scanning circuit of the fingerprint sensor further comprises:
the operation unit is used for calculating and obtaining the scanning result of each sensing unit according to the scanning result obtained by the scanning module;
and the matching unit is used for matching fingerprints according to the scanning results of the sensing units.
Compared with the prior art, the implementation mode of the invention has the main differences and effects that: the novel scanning mode of the sensing unit in the fingerprint identification sensor is provided, when the sensing unit scans at every time, the sensing units around the sensing unit participate in support and scan together, the number of the sensing units which scan simultaneously with the sensing unit working at present can be increased, the sensing area of scanning at every time is enlarged, the sensing area of scanning at every time is increased by improving the scanning method of the sensing unit, the sensing area of scanning at every time is increased, the sensitivity of the fingerprint identification sensor is improved, and the user experience is improved.
As a further improvement, when the currently working sensing units are a row of sensing units, the surrounding sensing units are sensing units in a row adjacent to the current row of sensing units; or when the currently working sensing units are a row of sensing units, the surrounding sensing units are sensing units in a row adjacent to the current row of sensing units.
Further, the sensing units can be in units of scanning in rows or columns, and the number of the sensing units scanned in each time is increased by increasing the number of rows or columns of the sensing units scanned in each time, so that the sensitivity of the fingerprint identification sensor is further improved.
As a further improvement, the adjacent row is a previous row or a next row of the current row of sensing units. The induction units in the previous line or the next line participate in the common scanning, so that the scanning precision is balanced while the number of the induction units in the common scanning is increased.
As a further improvement, the surrounding sensing units are adjacent to the currently operating sensing unit. And simultaneously scanning the adjacent sensing units and the currently working sensing unit, so that the obtained scanning result is more convenient for subsequent data processing.
As a further improvement, the surrounding sensing units may be eight sensing units adjacent to the currently operating sensing unit. According to the array arrangement of the sensing units, the area formed by the eight sensing units around and the sensing unit which works currently is just enlarged similarly to the area occupied by the sensing unit which works currently, so that the acquired fingerprint information is more convenient for subsequent data processing.
As a further improvement, the number of sensing units scanned at the same time can be the same during each scanning. The number of the sensing units which are arranged to scan at each time is the same, so that the areas with the same area are scanned at each time, and subsequent processing of fingerprint patterns is facilitated.
As a further improvement, the shape of the sensing unit can be rectangular, triangular or rhombic. The shape of the induction unit can be designed into different shapes according to actual requirements, different requirements of users can be flexibly and changeably met, and application scenes of the invention are expanded.
Drawings
FIG. 1 is a flow chart of a method for scanning a sensing element of a fingerprint recognition sensor according to a first embodiment of the present invention;
FIG. 2 is a schematic view of the sensing area of a fingerprint recognition sensor according to a first embodiment of the present invention;
FIGS. 3a to 3i are schematic views illustrating a scanning method of a sensing unit of a fingerprint sensor according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a single scan of a sensing element scanning method of a fingerprint sensor according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of the connection of an induction unit to a control circuit according to a second embodiment of the present invention;
FIGS. 6a to 6c are schematic views illustrating a scanning method of a sensing unit of a fingerprint sensor according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a sensing unit scanning circuit of a fingerprint recognition sensor according to a fifth embodiment of the present invention;
fig. 8 is a schematic structural view of a fingerprint recognition sensor according to a seventh embodiment of the present invention;
fig. 9 is a schematic structural view of a fingerprint recognition sensor according to an eighth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
The inventor of the present invention found that in the existing fingerprint sensor, the conventional scanning mode is to scan one by one from the first and last rows, or to scan one by one from the first and last columns, or to scan both sides in the middle of blooming, etc. The number of the induction units participating in scanning at a time can be found to be 1, each induction unit performs scanning once during each frame of scanning, and the total scanning area of the induction units is not larger than the area of the whole induction area. In order to acquire more effective fingerprint information in a limited sensing area and improve the acquisition precision, more effective fingerprint information needs to be acquired in a sensing area of a unit area, the total scanning area can be enlarged, and the larger the scanning area of a fixed sensing area is, the higher the resolution of the obtained fingerprint pattern is.
A first embodiment of the present invention relates to a sensing element scanning method of a fingerprint recognition sensor. The flow is shown in fig. 1, and specifically comprises the following steps:
step 101, scanning the currently working sensing unit and a plurality of sensing units around the currently working sensing unit simultaneously to obtain a scanning result.
Specifically, when the currently working sensing units are scanned, a plurality of sensing units around the currently working sensing units are scanned simultaneously, and a common scanning result of the sensing units participating in scanning simultaneously is obtained. That is, the existing scanning method is completely changed, the number of sensing units participating in the common scanning is more than one in a single scanning, and in a single frame scanning, a single sensing unit participates in at least one scanning, and simultaneously supports surrounding sensing units to perform multiple scanning, so that the total area scanned by the scanning method is larger than the area of the whole sensing region.
Step 102, judging whether all the induction units to be worked are scanned completely; if yes, ending the sensing unit scanning process in the embodiment; if not, go to step 103.
Specifically, after the previous scanning is completed, it is determined whether to scan other sensing units subsequently according to a preset scanning sequence.
Step 103, finding the sensing unit working in the next time sequence and a plurality of sensing units around the sensing unit according to a preset sequence, and then returning to execute step 101.
Specifically, if it is determined in step 102 that other sensing units need to be scanned, the corresponding sensing unit is found out, and a plurality of sensing units around the sensing unit that need to participate in the scanning are found out, and then step 101 is repeatedly executed to perform the scanning again.
In this embodiment, the currently operating sensing unit is one, and the sensing area of the fingerprint recognition sensor shown in fig. 2 is taken as an example to be further described below:
assuming that the conventional scanning method starts from the sensing unit (1,1), scans one by one along the row direction, that is, scans one by one sequentially from the sensing units (1,2), (1,3) … … (1, n), and then completes the scanning from (2,1), (2,2) … … (m, n), it is obvious that the total area scanned by the scanning method does not exceed the actual area of the sensing region.
In this embodiment, it is assumed that the above-mentioned surrounding sensing units are neighboring sensing units to the currently operating sensing unit, and specifically, in this embodiment, neighboring 8 sensing units are used as sensing units participating in scanning; moreover, each time of scanning, the number of sensing units scanned simultaneously is the same, that is, nine sensing units are scanned simultaneously each time. As shown in fig. 3a to 3i, when the 1 st area in the 1 st row is scanned, as shown in fig. 3a, the 2 nd sensing unit in the 2 nd row can be regarded as the currently operating sensing unit, and the eight sensing units around the adjacent sensing unit support to participate in the common scanning, at this time, the number of the sensing units scanned simultaneously is nine, and the area of the area scanned at a time is nine times of the area scanned at a time in the existing scanning mode; when scanning is performed in the 2 nd area in the 1 st row, as shown in fig. 3b, the 3 rd sensing unit in the 2 nd row may be regarded as the currently operating sensing unit, and the eight sensing units around the nearest sensing unit may support the currently operating sensing unit to participate in the common scanning, and it may be found that six sensing units perform scanning again among the nine sensing units; by analogy, when the 3 rd area in the 1 st row is scanned, the scanning schematic diagram is shown in fig. 3c, and when the 1 st area in the 2 nd row is scanned, the scanning schematic diagram is shown in fig. 3d until the final scanning is completed. In the whole single-frame scanning process, except that the four sensing units at the top point only perform scanning once, other sensing units perform scanning for many times, so that the total area of each scanning is increased, and the sensitivity of the fingerprint identification sensor is increased.
It should be noted that the length × width of the sensing unit in this embodiment may be 50um × 50 um. Because the width of fingerprint valleys and ridges is 200-400um, the area of the conventional fingerprint identification sensing unit is 75-50 um at present, that is, the width of one ridge and valley covers about 5 sensing units, the conventional scanning once scanning area is 50um x 50um, and the size of the sensing unit with the size is the same as that of the conventional sensing unit, so that the wide popularization of the fingerprint identification sensing unit is facilitated.
In addition, the shape of the induction unit in the embodiment is rectangular, the structure is simple, and the production is convenient. In practical applications, the shape of the sensing unit can also be triangular, rhombic or other shapes, which are not listed here. The shape of the induction unit can be designed into different shapes according to actual requirements, different requirements of users can be flexibly and changeably met, and application scenes of the invention are expanded.
Compared with the prior art, the present embodiment has the main differences and effects that: the novel scanning mode of the sensing unit in the fingerprint identification sensor is provided, when the sensing unit scans at every time, the sensing units around the sensing unit participate in support and scan together, the number of the sensing units which scan simultaneously with the sensing unit working at present can be increased, the sensing area of scanning at every time is enlarged, the sensing area of scanning at every time is increased by improving the scanning method of the sensing unit, the sensing area of scanning at every time is increased, the sensitivity of the fingerprint identification sensor is improved, and the user experience is improved. In addition, in the embodiment, the area scanned once is just enlarged similarly to the area occupied by the currently working sensing unit, and meanwhile, the area of the area scanned every time is the same, so that the acquired fingerprint information is more convenient for subsequent data processing.
It should be noted that, in practical applications, the manner mentioned in the present embodiment that the number of the sensing units participating in the scanning at a single time is nine may be utilized, and a single-scanning schematic diagram shown in fig. 4 may be utilized, that is, only three sensing units on the left and right sides of the currently-scanned sensing unit participate in the scanning, and the area of the single-scanning is in an "i" shape, so that the number of the sensing units participating in the scanning at a single time is reduced, and the power consumption of the system is reduced. Of course, other combinations of shapes may be utilized and are not listed here.
A second embodiment of the present invention relates to a sensing unit scanning method of a fingerprint recognition sensor. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: in the first embodiment, there is one sensing unit currently operating. In the second embodiment of the present invention, the currently operating sensing units are in a row. The sensitivity of the fingerprint identification sensor in the embodiment of the invention is further improved by increasing the number of the sensing units scanned each time in a unit of scanning each time.
In practical applications, when scanning a row of sensing units simultaneously, although one control circuit (the control circuit is a circuit for scanning and obtaining a scanning result) may be connected to each sensing unit, each sensing unit may be connected as shown in fig. 5, so as to reduce the number of control circuits and reduce the cost. That is, the sensing units in the same column may be connected to share one control circuit, for example, the sensing unit a1 and the sensing unit B1 … … sensing unit G1 are respectively connected to the control circuit 501 through the switch 511 and the switch 521 … …, the sensing unit a2 and the sensing unit B2 … … sensing unit G2 are respectively connected to the control circuit 502 through the switch 512 and the switch 522 … …, and the other connections are similar, when the sensing units in the row a need to be detected, the switch 511, the switch 512 … …, the switch 51n is turned off, and the other switches are turned on. Obviously, compared with the connection mode that each sensing unit is connected with one control circuit, the connection mode greatly reduces the use number of the control circuits.
It should be mentioned that all the sensing units can be connected to a control circuit, and the scanning step is completed by controlling the on/off sequence of each switch during scanning, but in this case, the scanning time is prolonged, so in practical application, the hardware cost and the scanning speed can be balanced as required.
Specifically, when the currently operating sensing unit is a row of sensing units, a plurality of sensing units around the currently operating sensing unit are sensing units in a row adjacent to the current row of sensing units, and are a previous row or a next row adjacent to the current row of sensing units, and the following takes the example of scanning the current row of sensing units and simultaneously scanning the next row of sensing units as an example, which is specifically described:
when the sensing units are used as scanning units, the scanning mode is schematically shown in fig. 6a to 6c, and first, as shown in fig. 6a, when the currently operating sensing unit is used as row a, a plurality of sensing units around the currently operating sensing unit are sensing units in row B, so that all sensing units in row a and row B need to be scanned simultaneously during the first scanning; next, as shown in fig. 6B, when the currently operating row of sensing units is changed into row B, all sensing units in row B and row C need to be scanned simultaneously during the second scanning; and so on, as shown in fig. 6c, until the currently operating sensing units are in F rows (assuming that F is the second last row of the sensing area), the sensing units scanned simultaneously are all sensing units in F rows and G rows (assuming that G is the last row of the sensing area). It should be noted that this may be used as the end of the scanning process, that is, the separate scanning of G rows is not performed any more, so as to save the scanning time, and of course, the scanning of G rows may be performed again.
It should be noted that, in addition to the above-mentioned simultaneous scanning of the sensing units in the next row of the current working sensing unit row, the sensing units in the previous row of the current working sensing unit row may also be scanned simultaneously, and the scanning methods are substantially the same, and are not described herein again.
In addition, in practical applications, in addition to the scanning of the sensing unit in units of one row in the embodiment, the scanning may also be performed in units of one column or in other manners according to design requirements, and the methods are substantially the same and are not described herein again.
A third embodiment of the present invention relates to a fingerprint recognition method of a fingerprint recognition sensor. The method comprises the following steps in addition to the method for scanning the sensing unit of the fingerprint identification sensor according to any one of the first embodiment and the second embodiment:
and performing fingerprint matching according to the obtained scanning results.
Specifically, after all the sensing units needing to be scanned are scanned, the result is directly subjected to fingerprint matching.
Taking a mode of scanning according to a row unit as an example, referring to fig. 6a to 6C, a scanning result obtained after scanning the sensing units in the rows a and B is "a + B", a scanning result obtained after scanning the sensing units in the rows B and C is "B + C", and so on, a scanning result obtained after scanning the sensing units in the rows F and G is "F + G"; then, directly using "A + B" as the scanning result A ' of the A line, using "B + C" as the scanning result B ' of the B line, using "F + G" as the scanning result F ' of the F line, and performing the subsequent fingerprint matching according to the existing fingerprint identification data processing mode.
A fourth embodiment of the present invention relates to a fingerprint recognition method of a fingerprint recognition sensor. The present embodiment is a further improvement on the basis of the third embodiment, in which the fingerprint matching is directly performed on the scanning result, but in the present embodiment, the scanning result needs to be calculated first to obtain the scanning result corresponding to each sensing unit, and then the fingerprint matching is performed on the scanning result obtained by calculation. The scanning result is more accurate, and the fingerprint matching accuracy is improved.
Specifically, after all the sensing units needing to be scanned are scanned, the method further comprises the following steps:
calculating to obtain the scanning result of each sensing unit according to the obtained scanning result; and matching the fingerprints according to the scanning results of the sensing units.
Still taking the way of scanning in units of rows as an example, the description is made with reference to fig. 6a to 6 c: after the scanning results "a + B" and "B + C" … … "F + G" are obtained, the scanning of the G-line sensing units is performed separately, that is, the scanning result "G" corresponding to the G-line sensing units is obtained separately, the scanning result "F" corresponding to the F-line sensing units is obtained by reversing upward according to the result "G", and by analogy, the scanning result "a" corresponding to the a-line sensing unit is obtained finally, so that the subsequent fingerprint matching is performed by using the scanning results "a" and "B" … … "G" obtained by calculation, which obviously better conforms to the actual scanning result, and the fingerprint matching performed thereby is more accurate.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the steps contain the same logical relationship, which is within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
A fifth embodiment of the present invention relates to a sensing element scanning circuit of a fingerprint recognition sensor, as shown in fig. 7, including:
and the scanning module is used for simultaneously scanning the currently working sensing unit and a plurality of sensing units around the sensing unit to obtain a scanning result. Specifically, in this embodiment, the plurality of sensing units around the sensing unit may be a plurality of sensing units adjacent to the currently operating sensing unit.
And the searching module is used for finding the sensing unit working at the next time sequence and a plurality of sensing units around the sensing unit according to the preset sequence.
And the judging module is used for triggering the scanning module until all the induction units to be worked are scanned.
In the present embodiment, the number of sensing units currently operating is 1 at each scanning, and the number of sensing units scanned at the same time is the same.
It should be noted that the length × width of the sensing unit in this embodiment may be 50um × 50 um.
In addition, the shape of the induction unit in the embodiment is rectangular, the structure is simple, and the production is convenient. In practical applications, the shape of the sensing unit can also be triangular, rhombic or other shapes, which are not listed here. The shape of the induction unit can be designed into different shapes according to actual requirements, different requirements of users can be flexibly and changeably met, and application scenes of the invention are expanded.
It should be understood that this embodiment is a system example corresponding to the first embodiment, and may be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
A sixth embodiment of the present invention relates to a sensing element scanning circuit of a fingerprint recognition sensor. The sixth embodiment is substantially the same as the fifth embodiment, and mainly differs therefrom in that: in the fifth embodiment, there is one sensing unit currently operating. In the sixth embodiment of the present invention, the currently operating sensing units are in a row. The sensitivity of the fingerprint identification sensor in the embodiment of the invention is further improved by increasing the number of the sensing units scanned each time in a unit of scanning each time.
Specifically, in this embodiment, the currently operating sensing units are a row of sensing units, and then a plurality of sensing units around the currently operating sensing units are sensing units in a row adjacent to the sensing unit in the current row.
In addition, the currently operating sensing unit may be a row of sensing units, and then a plurality of sensing units around the currently operating sensing unit are sensing units in a row adjacent to the current row of sensing units.
Since the second embodiment corresponds to the present embodiment, the present embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still valid in this embodiment, and the technical effects that can be achieved in the second embodiment can also be achieved in this embodiment, and are not described herein again in order to reduce the repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the second embodiment.
A seventh embodiment of the present invention relates to a fingerprint recognition sensor. As shown in fig. 8, the fingerprint sensor includes the sensing unit scanning circuit of the fingerprint sensor according to the fifth embodiment or the sixth embodiment, and further includes a matching unit for matching fingerprints according to the scanning results obtained by the scanning module.
Since the third embodiment corresponds to the present embodiment, the present embodiment can be implemented in cooperation with the third embodiment. The related technical details mentioned in the third embodiment are still valid in this embodiment, and the technical effects that can be achieved in the third embodiment can also be achieved in this embodiment, and are not described herein again in order to reduce the repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the third embodiment.
An eighth embodiment of the present invention relates to a fingerprint recognition sensor. As shown in fig. 9, the fingerprint sensor includes the sensing unit scanning circuit of the fingerprint sensor according to the fifth embodiment or the sixth embodiment, and further includes:
and the operation unit is used for calculating and obtaining the scanning result of each sensing unit according to the scanning result obtained by the scanning module.
And the matching unit is used for matching the fingerprint according to the scanning result of each sensing unit.
Since the fourth embodiment corresponds to the present embodiment, the present embodiment can be implemented in cooperation with the fourth embodiment. The related technical details mentioned in the fourth embodiment are still valid in the present embodiment, and the technical effects that can be achieved in the fourth embodiment can also be achieved in the present embodiment, and are not described herein again in order to reduce the repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the fourth embodiment.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (15)
1. A method for scanning a sensing unit of a fingerprint sensor, comprising the steps of:
A. simultaneously scanning the currently working induction unit and a plurality of induction units around the currently working induction unit to obtain a common scanning result of the induction units simultaneously participating in scanning;
B. finding out the induction unit working in the next time sequence and a plurality of induction units around the induction unit according to a preset sequence;
C. and repeating the steps A and B until all the induction units to be operated are scanned.
2. The method as claimed in claim 1, wherein when the currently operating sensing unit is a row of sensing units, the surrounding sensing units are sensing units in a row adjacent to the current row of sensing units; or,
when the currently working sensing units are a row of sensing units, the surrounding sensing units are sensing units in a row adjacent to the current row of sensing units.
3. The sensing unit scanning method of claim 2, wherein the adjacent row is one row before or one row after the sensing unit of the current row.
4. The method as claimed in claim 2, wherein the adjacent column is a previous column or a next column of the sensing units of the current column.
5. The method as claimed in claim 1, wherein the plurality of sensing units are adjacent to the currently operating sensing unit.
6. The method as claimed in claim 5, wherein the surrounding sensing units are eight sensing units adjacent to the currently operating sensing unit.
7. The method as claimed in claim 1, wherein the number of sensing units scanned at the same time is the same for each scanning.
8. The method of claim 1, wherein the sensing unit has a rectangular, triangular or diamond shape.
9. A fingerprint recognition method of a fingerprint recognition sensor, comprising the sensing unit scanning method of any one of claims 1 to 8, further comprising the steps of:
and B, fingerprint matching is carried out according to the scanning results obtained in the step A.
10. A fingerprint recognition method of a fingerprint recognition sensor, comprising the sensing unit scanning method of any one of claims 1 to 8, further comprising the steps of:
calculating to obtain the scanning result of each sensing unit according to the scanning result obtained in the step A;
and matching the fingerprints according to the scanning results of the sensing units.
11. A sensing element scanning circuit for a fingerprint sensor, comprising:
the scanning module is used for simultaneously scanning the currently working sensing unit and a plurality of sensing units around the sensing unit to obtain a scanning result;
the searching module is used for finding the sensing unit working at the next time sequence and a plurality of sensing units around the sensing unit according to a preset sequence;
and the judging module is used for triggering the scanning module until all the induction units to be worked are scanned.
12. The circuit of claim 11, wherein when the currently operating sensing unit is a row of sensing units, the surrounding sensing units are sensing units in a row adjacent to the current row of sensing units; or,
when the currently working sensing units are a row of sensing units, the surrounding sensing units are sensing units in a row adjacent to the current row of sensing units.
13. The circuit of claim 11, wherein the surrounding sensing units are adjacent to the currently operating sensing unit.
14. A fingerprint recognition sensor, comprising: the sensing unit scanning circuit of the fingerprint recognition sensor according to any one of claims 11 to 13, further comprising a matching unit for performing fingerprint matching according to the scanning results obtained by the scanning module.
15. A fingerprint recognition sensor, comprising: the sensing element scanning circuit of a fingerprint recognition sensor according to any one of claims 11 to 13, further comprising:
the operation unit is used for calculating and obtaining the scanning result of each sensing unit according to the scanning result obtained by the scanning module;
and the matching unit is used for matching fingerprints according to the scanning results of the sensing units.
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| CN103761015A (en) * | 2013-12-30 | 2014-04-30 | 深圳贝特莱电子科技有限公司 | Scanning method and system for capacitive touch screen control chip |
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