WO2020113411A1 - Circuit de traitement de signal d'empreinte digitale, dispositif électronique, et procédé de traitement de signal d'empreinte digitale - Google Patents

Circuit de traitement de signal d'empreinte digitale, dispositif électronique, et procédé de traitement de signal d'empreinte digitale Download PDF

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Publication number
WO2020113411A1
WO2020113411A1 PCT/CN2018/119131 CN2018119131W WO2020113411A1 WO 2020113411 A1 WO2020113411 A1 WO 2020113411A1 CN 2018119131 W CN2018119131 W CN 2018119131W WO 2020113411 A1 WO2020113411 A1 WO 2020113411A1
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Prior art keywords
fingerprint
signal
generate
sensing pixels
output
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PCT/CN2018/119131
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English (en)
Chinese (zh)
Inventor
赵维民
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深圳市汇顶科技股份有限公司
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Priority to PCT/CN2018/119131 priority Critical patent/WO2020113411A1/fr
Priority to CN201880002633.2A priority patent/CN109690565B/zh
Publication of WO2020113411A1 publication Critical patent/WO2020113411A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing

Definitions

  • the present disclosure relates to fingerprint signal processing technology, and in particular to a fingerprint signal processing circuit capable of extracting fingerprint signals and related electronic equipment and fingerprint signal processing methods.
  • the fingerprint sensor circuit can be directly integrated under the screen of the mobile phone, without the need for additional settings outside the screen of the mobile phone, thereby improving space utilization.
  • the fingerprint recognition area on the screen will be defined in a very small range, to avoid the fact that the amount of fingerprint information is too large, which increases the time for fingerprint information to be transmitted to the main control circuit of the mobile phone, resulting in a slower response speed of the fingerprint operation.
  • the user's eyes must look at the screen of the mobile phone to ensure that the position of the finger is within this small range, causing inconvenience in use.
  • One of the objectives of the present disclosure is to provide a fingerprint signal processing circuit capable of extracting fingerprint signals and related electronic devices and fingerprint signal processing methods to solve the above problems.
  • An embodiment of the present disclosure provides a fingerprint signal processing circuit.
  • the fingerprint signal processing circuit includes a noise reduction circuit, a first signal extraction circuit and a second signal extraction circuit.
  • the noise reduction circuit is used to receive a plurality of sensing outputs respectively generated by a plurality of fingerprint sensing pixels, and reduce a fixed pattern noise component carried by each sensing output to generate a plurality of first output signals.
  • the first signal extraction circuit is coupled to the noise reduction circuit for extracting signal components higher than a first predetermined frequency in each first output signal to generate a plurality of second output signals.
  • the second signal extraction circuit coupled to the first signal extraction circuit, is used to extract the signal components of each second output signal lower than the second predetermined frequency to generate a plurality of third output signals, and according to the Every N third output signals of the plurality of third output signals generate a fingerprint signal corresponding to every N fingerprint sensing pixels of the plurality of fingerprint sensing pixels, wherein the second predetermined frequency is high
  • N is a positive integer greater than 1.
  • An embodiment of the present disclosure provides an electronic device.
  • the electronic device includes at least one fingerprint sensor array, fingerprint signal processing circuit and main control circuit.
  • the at least one fingerprint sensor array includes a plurality of fingerprint sensing pixels.
  • the fingerprint signal processing circuit is coupled to the at least one fingerprint sensor array to receive a plurality of sensor outputs from the plurality of fingerprint sensor pixels to generate corresponding to the plurality of fingerprint sensor pixels Fingerprint signal.
  • the main control circuit is coupled to the fingerprint signal processing circuit for receiving the fingerprint signal and performing fingerprint identification according to the fingerprint signal.
  • An embodiment of the present disclosure provides a fingerprint signal processing method.
  • the fingerprint signal processing method includes the following steps: receiving a plurality of sensor outputs generated by a plurality of fingerprint sensor pixels; reducing a fixed pattern noise component carried by each sensor output to generate a plurality of first output signals; extracting each A signal component higher than the first predetermined frequency in an output signal to generate a plurality of second output signals; extracting a signal component lower than the second predetermined frequency in each second output signal to generate a plurality of third output signals, wherein The second predetermined frequency is higher than the first predetermined frequency; and according to every N third output signals of the plurality of third output signals, generating every N fingerprints corresponding to the plurality of fingerprint sensing pixels The fingerprint signal corresponding to the sensing pixel, where N is a positive integer greater than 1.
  • FIG. 1 is a functional block diagram of an embodiment of an electronic device of the present disclosure.
  • FIG. 2 is a schematic diagram of an embodiment of one of the fingerprint sensors shown in FIG. 1.
  • FIG. 3 is a schematic structural view of an embodiment of a part of the electronic device shown in FIG. 1.
  • FIG. 4 is a schematic diagram of an embodiment of the first signal extraction circuit shown in FIG. 1.
  • FIG. 5 is a functional block diagram of another embodiment of an electronic device of the present disclosure.
  • FIG. 6 is a flowchart of an embodiment of a fingerprint signal processing method of the present disclosure.
  • Fingerprint signal processing circuit Fingerprint signal processing circuit
  • FIG. 1 is a functional block diagram of an embodiment of an electronic device of the present disclosure.
  • the electronic device 100 may be implemented by an electronic device with a fingerprint recognition function, such as a mobile phone, a lithographic computer, a notebook computer, a wearable device with a fingerprint recognition function, a portable computing device with a fingerprint recognition function, or another electronic device with a fingerprint recognition function.
  • a fingerprint recognition function such as a mobile phone, a lithographic computer, a notebook computer, a wearable device with a fingerprint recognition function, a portable computing device with a fingerprint recognition function, or another electronic device with a fingerprint recognition function.
  • the "fingerprint" referred to in this disclosure may represent fingerprints, palm prints, or other textures with biological characterization.
  • the electronic device 100 includes (but is not limited to) K fingerprint sensors 102_1-102_K, a fingerprint signal processing circuit 110, and a host control circuit 120, where K is a positive integer.
  • K fingerprint sensors 102_1-102_K may be disposed adjacent to each other in the electronic device 100 to form a large-scale fingerprint recognition area.
  • K fingerprint sensors 102_1-102_K may be arranged adjacent to each other under the display screen of the electronic device 100 to provide a large range of users Fingerprint recognition area under the screen.
  • K fingerprint sensors 102_1-102_K can generate a plurality of sensor outputs ⁇ SR ⁇ according to a touch input, wherein each fingerprint sensor can include a plurality of fingerprint sensor pixels, and each fingerprint sensor pixel can generate a sensor according to the touch input Output.
  • each fingerprint sensor may be implemented by a fingerprint sensor array.
  • the fingerprint sensor array may include a plurality of fingerprint sensing pixels arranged in M rows and R columns, where M and R are positive integers greater than 1.
  • M and R are positive integers greater than 1.
  • the fingerprint signal processing circuit 110 is coupled to the K fingerprint sensors 102_1-102_K to receive multiple sensor outputs ⁇ SR ⁇ from the K fingerprint sensors 102_1-102_K to generate corresponding multiple fingerprint signals ⁇ SF ⁇ .
  • the main control circuit 120 is coupled to the fingerprint signal processing circuit 110 for receiving multiple fingerprint signals ⁇ SF ⁇ and performing fingerprint identification based on the multiple fingerprint signals ⁇ SF ⁇ . It is worth noting that, since the main control circuit 120 can also control other circuit modules and related operations of the electronic device 100 (eg, touch sensing operation, image display operation, and power management operation), the main control circuit 120 is assigned to the fingerprint The bandwidth of the sensing operation can be set within a predetermined range to take into account the overall operation of the electronic device 100. In this embodiment, the fingerprint signal processing circuit 110 may determine the amount of data of the plurality of fingerprint signals ⁇ SF ⁇ transmitted to the main control circuit 120 according to the predetermined range to meet the design requirements.
  • the amount of fingerprint information (or the amount of data) carried by multiple sensor outputs ⁇ SR ⁇ may exceed the above-mentioned predetermined range. If multiple sensor outputs ⁇ SR ⁇ are directly transmitted to the main control circuit 120, the response speed of the fingerprint operation will become slower.
  • the fingerprint signal processing circuit 110 can extract from a large amount of fingerprint information carried by multiple sensor outputs ⁇ SR ⁇ sufficient to successfully identify the fingerprint operation The amount of information to generate a plurality of fingerprint signals ⁇ SF ⁇ , thereby transmitting the plurality of fingerprint signals ⁇ SF ⁇ to the main control circuit 120.
  • multiple fingerprint signals ⁇ SF ⁇ have a smaller amount of data.
  • the time that fingerprint information is transmitted from the fingerprint signal processing circuit 110 to the main control circuit 120 does not (or hardly) slow down due to the increase in the fingerprint recognition area.
  • the electronic device 100 with a large-scale fingerprint recognition area can still maintain a good fingerprint operation response speed.
  • the fingerprint signal processing circuit 110 may include (but is not limited to) a noise reduction circuit 112, a first signal extraction circuit 114, and a second signal extraction circuit 116.
  • the noise reduction circuit 112 can be used to reduce the noise components related to process fluctuations carried by each sensor output, and the first signal extraction circuit 114 and the second signal extraction circuit 116 can be used to reduce other noise components carried by each sensor output.
  • the noise reduction circuit 112 can be used to receive multiple sensor outputs ⁇ SR ⁇ and reduce/filter out the fixed pattern noise (FPN) component carried by each sensor output to generate multiple first output signals ⁇ SO1 ⁇ .
  • FPN fixed pattern noise
  • the noise reduction circuit 112 can reduce the fixed pattern noise component carried by the sensor output of each fingerprint sensor pixel, so that each sensor output processed by noise reduction is used as the corresponding first output signal.
  • the first signal extraction circuit 114 is coupled to the noise reduction circuit 112 to extract signal components higher than the first predetermined frequency FD1 in each first output signal to generate a plurality of second output signals ⁇ SO2 ⁇ , wherein each The second output signal can be regarded as a signal obtained by subtracting the fixed pattern noise component and the signal component lower than the first predetermined frequency FD1 from the corresponding sensor output.
  • the second signal extraction circuit 116 is coupled to the first signal extraction circuit 114 for extracting the signal component of the second predetermined frequency FD2 in each second output signal to generate a plurality of third output signals ⁇ SO3 ⁇ , and according to the plurality of The third output signal ⁇ SO3 ⁇ generates a plurality of fingerprint signals ⁇ SF ⁇ , wherein the second predetermined frequency FD2 is higher than the first predetermined frequency FD1.
  • Each third output signal may be regarded as a signal obtained by subtracting a fixed pattern noise component, a signal component lower than the first predetermined frequency FD1 and a signal component of the second predetermined frequency FD2 from the corresponding sensor output.
  • the fingerprint signal processing circuit 110 can greatly reduce the amount of information carried by the sensing output of each fingerprint sensing pixel, so that the data amount of multiple fingerprint signals ⁇ SF ⁇ can satisfy the fingerprint signal processing circuit 110
  • the bandwidth specification with the main control circuit 120 that is, the above-mentioned predetermined range.
  • the second signal extraction circuit 116 can generate a plurality of fingerprint signals ⁇ SF ⁇ by reducing the amount of data to further reduce the amount of fingerprint information transmitted to the main control circuit 120.
  • the second signal extraction circuit 116 can generate every N fingerprint sensing pixels in the plurality of fingerprint sensing pixels according to every N third output signals in the plurality of third output signals ⁇ SO3 ⁇ Fingerprint signal (N is a positive integer greater than 1).
  • the second signal extraction circuit 116 may regard the N fingerprint sensing pixels corresponding to every N third output signals as a single fingerprint pixel, and generate a corresponding fingerprint pixel according to the N third output signals.
  • One fingerprint signal, thereby reducing the amount of fingerprint information transmitted to the main control circuit 120, wherein the data amount of the fingerprint signal may be less than the sum of the respective data amounts of the N third output signals.
  • the second signal extraction circuit 116 may include a low-pass filter 122, a spatial downsampling circuit (spatial downsampling/subsampling circuit) 124, and a bit truncation circuit (bit truncation circuit) ) 126.
  • the low-pass filter 122 is coupled to the first signal extraction circuit 114 to filter out signal components higher than the second predetermined frequency FD2 in each second output signal output by the first signal extraction circuit 114 to generate a plurality of third outputs Signal ⁇ SO3 ⁇ .
  • the spatial down-sampling circuit 124 is coupled to the low-pass filter 122 for down-sampling the plurality of third output signals ⁇ SO3 ⁇ to generate a plurality of down-sampling signals ⁇ SD ⁇ , wherein the plurality of third output signals can be used for Generate a single down-sampled signal. That is to say, the number of multiple down-sampled signals ⁇ SD ⁇ is smaller than the number of multiple third output signals ⁇ SO3 ⁇ .
  • the spatial downsampling circuit 124 may sample every N fingerprint sensing pixels, and average or add the corresponding N third output signals to generate a downsampling signal as the output signal corresponding to a single fingerprint sensing pixel .
  • the bit interception circuit 126 is coupled to the space downsampling circuit 124, and is used to perform bit interception processing on the multiple downsampled signals ⁇ SD ⁇ to generate multiple fingerprint signals ⁇ SF ⁇ , wherein the number of bits of a single fingerprint signal is less than The number of bits in a single down-sampled signal.
  • the bit truncation circuit 126 may truncate one or more least significant bits (LSB) of each down-sampled signal, leaving one or more most significant bits (MSB) of each down-sampled signal ) As the corresponding fingerprint signal. Further explanation is as follows.
  • FIG. 2 is a schematic diagram of an embodiment of one fingerprint sensor 102_i (i is a positive integer from 1 to K) among the K fingerprint sensors 102_1-102_K shown in FIG. 1.
  • the fingerprint sensor 102_i (or fingerprint sensor array) also includes X rows of dummy pixels and Y columns of dummy pixels , Where X and Y are positive integers greater than or equal to 1.
  • the noise reduction circuit 112 can receive the line noise signal NRi, which is located in the same line as the fingerprint sensing pixel Pi The average of the output signals generated by multiple dummy pixels. By subtracting the line noise signal NRi from the sensor output SRi (that is, one of the multiple sensor outputs ⁇ SR ⁇ ), the noise reduction circuit 112 can reduce/eliminate the line fixed pattern noise carried by the sensor output SRi. Similarly, the noise reduction circuit 112 can receive a column noise signal NCi, which is an average of output signals generated by a plurality of pseudo pixels located in the same column as the fingerprint sensing pixel Pi.
  • the noise reduction circuit 112 can reduce/eliminate the column fixed pattern noise carried by the sensor output SRi.
  • the noise reduction circuit 112 may subtract the row noise signal NRi and the column noise signal NCi from the sensing output SRi to generate the first output signal SO1i (ie, one of the plurality of first output signals ⁇ SO1 ⁇ ).
  • the fingerprint sensor 102_i may have a different structure of the fingerprint sensing array.
  • the fingerprint sensor 102_i can be set with dummy pixels for four weeks.
  • the line noise signal NRi may be an output signal generated by a dummy pixel located in the same line as the fingerprint sensing pixel Pi.
  • the column noise signal NCi may be an output signal generated by a dummy pixel located in the same column as the fingerprint sensing pixel Pi.
  • the noise reduction circuit 112 may also deduct only one of the row noise signal NRi and the column noise signal NCi from the sensor output Sri.
  • the fingerprint signal processing circuit 110 can reduce/filter out other noise components carried by each first output signal, such as noise components caused by background light interference and noise caused by screen structure interference ingredient.
  • FIG. 3 is a schematic structural diagram of an embodiment of a part of the electronic device 100 shown in FIG. 1.
  • the operation of the fingerprint signal processing circuit 110 is described based on an electronic device (electronic device 100) having an under-screen optical fingerprint recognition structure.
  • the fingerprint signal processing circuit 110 can also be applied to electronic devices that have other off-screen biometric identification structures (eg, off-screen ultrasonic fingerprint identification structures).
  • the electronic device 100 includes (but is not limited to) a cover glass 302, a screen structure (such as a display screen structure or a display touch screen structure) 304, and a fingerprint sensor module 310.
  • the fingerprint sensing area 303 of the cover glass 302 is located above the fingerprint recognition area formed by the K fingerprint sensors 102_1-102_K, and is used to receive a touch input (ie, finger contact).
  • the screen structure 304 includes a display module (for example, an organic light-emitting diode (OLED) display module) 306.
  • OLED organic light-emitting diode
  • the light-transmitting hole structure 308 (including a plurality of light-transmitting holes) in the display module 306 can allow the reflected light LR (generated by the finger to reflect the incident light LI sent by the display module 306) through the display module 306 to the fingerprint sensor below the screen structure 304 Module 310.
  • the fingerprint sensor module 310 includes an optical collimator array 312 and K fingerprint sensors 102_1-102_K shown in FIG. 1.
  • the optical collimator array 312 can guide the reflected light LR to K fingerprint sensors 102_1-102_K, so that the fingerprint sensing pixels included in each fingerprint sensor can generate a sensing output according to the touch input above the screen structure 304 (i.e. multiple One of the sensor outputs ⁇ SR ⁇ ).
  • the light signal received by a fingerprint sensor pixel also includes background light LS2 and light transmission
  • the hole structure 308 diffracts the diffracted light LS3 generated by the reflected light LR. Therefore, the sensor output from the fingerprint sensor pixel includes the background light signal (ie, the noise component generated by the background light interference) generated by the interference of the background light LS2 and the screen generated by the interference of the screen structure 304 Structure signal (that is, the noise component caused by the interference of the screen structure).
  • the fingerprint signal processing circuit 110 may use the first signal extraction circuit 114 and the second signal extraction circuit 116 to reduce/eliminate the background light signal and the screen structure signal in the sensor output of the fingerprint sensor pixel.
  • FIG. 4 is a schematic diagram of an embodiment of the first signal extraction circuit 114 shown in FIG. 1.
  • the first signal extraction circuit 114 may extract signal components higher than the first predetermined frequency FD1 in each first output signal (one of the plurality of first output signals ⁇ SO1 ⁇ ) to generate a plurality of second Output signal ⁇ SO2 ⁇ .
  • the first signal extraction circuit 114 can filter out the signal components lower than the first predetermined frequency FD1 in each first output signal. Since the signal component generated by the interference of the background light (for example, the background light LS2 shown in FIG.
  • each first output signal may be a DC noise signal or a low-frequency noise signal
  • the first signal extraction circuit 114 may be based on The appropriate first predetermined frequency FD1 filters out the background light signal generated by the interference of the background light in each first output signal.
  • the first signal extraction circuit 114 may include (but is not limited to) a low-pass filter 412 and a subtractor 414.
  • the low-pass filter 412 is coupled to the noise reduction circuit 112 shown in FIG. 1 to filter out signal components higher than the first predetermined frequency FD1 in each first output signal to generate a plurality of filtered signals ⁇ SF1 ⁇ .
  • the subtractor 414 is coupled to the noise reduction circuit 112 and the low-pass filter 412 shown in FIG.
  • each filtered signal output by the low-pass filter 412 includes a background light signal generated by interference of background light in the corresponding first output signal, compared to a plurality of first output signals ⁇ SO1 ⁇ , the output of the subtractor 414
  • the background light noise component in multiple second output signals ⁇ SO2 ⁇ can be greatly reduced. Therefore, the data amount of the second output signal will be smaller than the data amount of the first output signal.
  • the first signal extraction circuit 114 may also be implemented by different circuit structures.
  • the first signal extraction circuit 114 may be implemented by a high-pass filter whose cutoff frequency is equal to the first predetermined frequency FD1 to extract signal components higher than the first predetermined frequency FD1 in each first output signal.
  • the second signal extraction circuit 116 shown in FIG. 1 can be used to reduce/eliminate the noise component. Please refer to Figure 1 and Figure 3 again.
  • the second signal extraction circuit 116 may extract signal components lower than the second predetermined frequency FD2 in each second output signal (one of the plurality of second output signals ⁇ SO2 ⁇ ) to filter out each Signal components in the second output signal that are higher than the second predetermined frequency FD2. Since the signal components generated by the interference of the screen structure (eg, screen structure 304 shown in FIG.
  • each second output signal may be a high-frequency noise signal
  • the second signal extraction circuit 116 may be The frequency FD2 filters out the screen structure signal generated by the interference of the screen structure in each second output signal. It is worth noting that, compared to the plurality of second output signals ⁇ SO2 ⁇ , since the low-pass filter 122 outputs the plurality of third output signals ⁇ SO3 ⁇ , the noise component of the screen structure has been greatly reduced. Therefore, the data amount of the third output signal will be smaller than the data amount of the second output signal.
  • the second signal extraction circuit 116 can also use at least one of the space downsampling circuit 124 and the bit intercept circuit 126 to extract multiple third output signals ⁇ SO3 ⁇ successfully enough The amount of data for identifying the fingerprint operation further reduces the amount of fingerprint information transmitted to the main control circuit 120 shown in FIG.
  • the plurality of fingerprint sensing pixels arranged in M rows and R columns may include adjacent groups of fingerprint sensing pixels, and each group of fingerprint sensing pixels includes adjacent N fingerprint sensing pixels (N Is a positive integer greater than 1)
  • the spatial downsampling circuit 124 can perform spatial downsampling on the N fingerprint sensing pixels of each group of fingerprint sensing pixels to correspond to the N fingerprint sensing pixels of each group of fingerprint sensing pixels
  • the N third output signals produce a down-sampled signal.
  • every 4 fingerprint sensing pixels for example, 4 adjacent active pixels arranged in 2 rows and 2 columns
  • the spatial downsampling circuit 124 may perform downsampling processing according to the four third output signals corresponding to every four fingerprint sensing pixels to generate a downsampling signal, where each downsampling signal may correspond to a group of fingerprint sensing pixels .
  • the spatial downsampling circuit 124 may average every fourth third output signal as a downsampling signal (e.g., one of a plurality of downsampling signals ⁇ SD ⁇ ). In this way, the data amount of the plurality of down-sampled signals ⁇ SD ⁇ is a quarter of the data amount of the plurality of third output signals ⁇ SO3 ⁇ .
  • the data amount of the fingerprint signal corresponding to the down-sampled signal will be 83% of the data volume of the sampled signal. Therefore, with the space downsampling circuit 124 and the bit intercept circuit 126, a data reduction ratio of about 21% can be obtained.
  • the amount of data output by the sensor is increased by 5 times, due to multiple The data volume of the fingerprint signal ⁇ SF ⁇ can be greatly reduced, and multiple fingerprint signals ⁇ SF ⁇ can still meet the bandwidth requirements of the main control circuit 120.
  • the distance between two adjacent sets of fingerprint sensing pixels used for spatial downsampling can be smaller than the fingerprint ridge lines and fingerprint valley lines adjacent to each other (as shown in FIG. 3
  • the distance between the line and the fingerprint valley line) is greater than the distance between two adjacent light-transmitting holes in the screen structure (two adjacent light-transmitting holes in the light-transmitting hole structure 308 shown in FIG. 3).
  • the obtained down-sampled signal may include information sufficient to identify the fingerprint ridge line and fingerprint valley line, and may reduce the information components interfered by the screen structure.
  • the fingerprint signal is reduced in proportion to the data output from the sensor It can be further reduced, shortening the time for fingerprint information to be transmitted to the main control circuit, and solving the problem of limited fingerprint recognition area.
  • the spatial down-sampling circuit 124 may select a third output signal from every N third output signals as a corresponding down-sampled signal, where the N third output signals correspond to a fingerprint N fingerprint sensing pixels adjacent to each other in the sensing array. In some embodiments, the spatial downsampling circuit 124 may add every four third output signals as a downsampling signal. In some embodiments, the bit truncation circuit 516 may truncate the T least significant bits (T is a positive integer) of a down-sampled signal to generate a corresponding fingerprint signal. These design changes are within the scope of this disclosure.
  • FIG. 5 is a functional block diagram of another embodiment of an electronic device of the present disclosure.
  • the structure of the electronic device 500 is similar to the electronic device 100 shown in FIG. 1, the main difference between the two is that the second signal extraction circuit 516 of the fingerprint signal processing circuit 510 can directly output multiple down-sampled signals ⁇ SD ⁇ to Multiple fingerprint signals ⁇ SF ⁇ of the main control circuit 120. Since those skilled in the art should understand the operation of the electronic device 500 after reading the relevant paragraphs of FIGS. 1-4, further description will not be repeated here.
  • the second signal extraction circuit 116 shown in FIG. 1 can also directly perform bit truncation processing on multiple third output signals ⁇ SO3 ⁇ to generate multiple fingerprint signals ⁇ SF ⁇ , of which many Although the number of fingerprint signals ⁇ SF ⁇ is equal to the number of multiple third output signals ⁇ SO3 ⁇ , the number of bits of a single fingerprint signal is smaller than the number of bits of a single third output signal.
  • the fingerprint signal processing mechanism proposed by the present disclosure can be simply summarized as the flowchart shown in FIG. 6.
  • 6 is a flowchart of an embodiment of a fingerprint signal processing method of the present disclosure. If the results obtained are substantially the same, the steps do not have to be performed in the order shown in FIG. 6.
  • the fingerprint signal processing method shown in FIG. 6 is described below with the electronic device 100 shown in FIG. 1. However, it is also feasible to apply the fingerprint signal processing method shown in FIG. 6 to other electronic devices with a fingerprint recognition function.
  • the fingerprint signal processing method shown in FIG. 6 can be simply summarized as follows.
  • Step 602 Receive multiple sensing outputs respectively generated by multiple fingerprint sensing pixels.
  • the noise reduction circuit 112 can be used to receive multiple sensing outputs ⁇ SR ⁇ .
  • Step 604 Reduce the fixed pattern noise component carried by each sensor output to generate multiple first output signals.
  • the noise reduction circuit 112 may perform noise reduction processing on multiple sensor outputs ⁇ SR ⁇ to reduce the fixed pattern noise component carried by each sensor output, and use the multiple sensor outputs after noise reduction processing as multiple The first output signal ⁇ SO1 ⁇ .
  • Step 606 Extract signal components higher than the first predetermined frequency in each first output signal to generate a plurality of second output signals.
  • the first signal extraction circuit 114 may extract signal components higher than a first predetermined frequency in each first output signal to generate a plurality of second output signals ⁇ SO2 ⁇ , wherein each first output signal is lower than the first
  • the signal component of the predetermined frequency may include a background light signal generated by interference of the background light. Therefore, the first signal extraction circuit 114 can filter out noise components generated by the background light interference in each first output signal.
  • Step 608 Extract signal components lower than the second predetermined frequency in each second output signal to generate a plurality of third output signals, wherein the second predetermined frequency is higher than the first predetermined frequency.
  • the second signal extraction circuit 116 may extract signal components lower than the second predetermined frequency in each second output signal to generate a plurality of third output signals ⁇ SO3 ⁇ , wherein each second output signal is higher than the second
  • the signal component of the predetermined frequency may include a screen structure signal generated by interference of the screen structure. Therefore, the second signal extraction circuit 116 can filter out noise components generated by the interference of the screen structure in each second output signal.
  • Step 610 Generate a fingerprint signal corresponding to every N fingerprint sensing pixels of the plurality of fingerprint sensing pixels according to every N third output signals of the plurality of third output signals, where N is Positive integer greater than 1.
  • the second signal extraction circuit 116 may generate a plurality of fingerprint signals ⁇ SF ⁇ according to every N third output signals among the plurality of third output signals ⁇ SO3 ⁇ , wherein for the plurality of third output signals ⁇ SO3 ⁇
  • the second signal extraction circuit 116 can generate one according to the N third output signals The fingerprint signal, thereby reducing the amount of data transferred to the main control circuit 120.
  • the second signal extraction circuit 116 may perform down-sampling on every N third output signals to generate a down-sampled signal, and generate a corresponding fingerprint signal according to the down-sampled signal.
  • the second signal extraction circuit 116 may perform bit truncation processing on the down-sampled signal to generate a corresponding fingerprint signal.
  • the second signal extraction circuit 116 may directly use the down-sampled signal as a corresponding fingerprint signal. Since those skilled in the art can understand the details of each step in the method shown in FIG. 6 after reading the relevant paragraphs of FIGS. 1 to 5, further description will not be repeated here.
  • the fingerprint signal processing mechanism proposed in the present disclosure can greatly reduce the amount of fingerprint information transmitted to the main control circuit, therefore, the time for fingerprint information to be transmitted to the main control circuit will not (or hardly) be increased because the fingerprint recognition area increases For the sake of slowing down.
  • adopting the fingerprint signal processing mechanism proposed by the present disclosure can provide a good user experience.

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Abstract

L'invention concerne un circuit de traitement de signal d'empreinte digitale (110, 510), un dispositif électronique (100, 500) et un procédé de traitement de signal d'empreinte digitale. Le circuit de traitement de signal d'empreinte digitale (110) comprend un circuit de réduction de bruit (112), un premier circuit d'extraction de signal (114) et un second circuit d'extraction de signal (116, 516). Le circuit de réduction de bruit (112) est configuré pour recevoir une pluralité de sorties de détection ({SR}) respectivement générées par une pluralité de pixels de détection d'empreinte digitale (Pi) et pour réduire les composantes de bruit en mode fixe transportées par des sorties de détection (SRi) de façon à générer une pluralité de premiers signaux de sortie ({S01}). Le premier circuit d'extraction de signal (114) est configuré pour extraire des composantes de signal supérieures à une première fréquence prédéterminée à partir de premiers signaux de sortie (S01i) de façon à générer une pluralité de seconds signaux de sortie ({S02}). Le second circuit d'extraction de signal (116, 516) est configuré pour extraire des composantes de signal inférieures à une seconde fréquence prédéterminée à partir des deuxièmes signaux de sortie de façon à générer une pluralité de troisièmes signaux de sortie ({S03}), et générer des signaux d'empreintes digitales ({SF}) correspondant à la pluralité de pixels de détection d'empreintes digitales (Pi) en fonction de la pluralité des troisièmes signaux de sortie ({S03}). La seconde fréquence prédéterminée est supérieure à la première fréquence prédéterminée. Le circuit de traitement de signal d'empreinte digitale (110, 510) réduit significativement la quantité d'informations d'empreinte digitale.
PCT/CN2018/119131 2018-12-04 2018-12-04 Circuit de traitement de signal d'empreinte digitale, dispositif électronique, et procédé de traitement de signal d'empreinte digitale WO2020113411A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2018/119131 WO2020113411A1 (fr) 2018-12-04 2018-12-04 Circuit de traitement de signal d'empreinte digitale, dispositif électronique, et procédé de traitement de signal d'empreinte digitale
CN201880002633.2A CN109690565B (zh) 2018-12-04 2018-12-04 指纹信号处理电路、电子设备和指纹信号处理方法

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