WO2020132914A1 - Modules de reconnaissance d'empreintes digitales, dispositifs électroniques et puce - Google Patents

Modules de reconnaissance d'empreintes digitales, dispositifs électroniques et puce Download PDF

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Publication number
WO2020132914A1
WO2020132914A1 PCT/CN2018/123744 CN2018123744W WO2020132914A1 WO 2020132914 A1 WO2020132914 A1 WO 2020132914A1 CN 2018123744 W CN2018123744 W CN 2018123744W WO 2020132914 A1 WO2020132914 A1 WO 2020132914A1
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WIPO (PCT)
Prior art keywords
fingerprint
lens
fingerprint sensor
view
identification module
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PCT/CN2018/123744
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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/CN2018/123744 priority Critical patent/WO2020132914A1/fr
Priority to CN201880003036.1A priority patent/CN109791609A/zh
Publication of WO2020132914A1 publication Critical patent/WO2020132914A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition

Definitions

  • the present disclosure relates to fingerprint signal processing technology, and in particular, to a fingerprint signal processing circuit capable of extracting fingerprint signals, related electronic equipment, chips, 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 size of the pixel array (or fingerprint sensing array) in the fingerprint sensing circuit is usually increased.
  • the thickness of the entire optical recognition system for example, total lens length (TTL)
  • TTL total lens length
  • One of the objectives of the present disclosure is to provide an under-screen optical fingerprint recognition module with multiple fingerprint sensing arrays and related electronic devices and chips to solve the above problems.
  • An embodiment of the present disclosure provides a fingerprint recognition module.
  • the fingerprint identification module is arranged below the display screen.
  • the fingerprint identification module includes N lens units and a fingerprint sensing circuit, where N is a positive integer greater than 1.
  • the N lens units are separately arranged below the display screen.
  • the fingerprint sensing circuit has N fingerprint sensing arrays, and the N fingerprint sensing arrays are respectively disposed under the N lens units corresponding to the N lens center regions of the N lens units, wherein each fingerprint
  • the sensor array is used to sense the reflected signal incident on the fingerprint sensor array from the lens center area of the corresponding lens unit of the fingerprint sensor array, the reflected signal is a light signal reflected by an object above the display screen And produced.
  • An embodiment of the present disclosure provides an electronic device.
  • the electronic device includes a display screen and a fingerprint recognition module.
  • the fingerprint identification module is disposed below the display screen and is used to identify fingerprint information carried by objects above the display screen.
  • the fingerprint identification module includes N lens units and a fingerprint sensing circuit, where N is a positive integer greater than 1.
  • the N lens units are separately arranged below the display screen.
  • the fingerprint sensing circuit has N fingerprint sensing arrays, and the N fingerprint sensing arrays are respectively disposed under the N lens units corresponding to the N lens center regions of the N lens units, wherein each fingerprint
  • the sensor array is used to sense the reflected signal incident on the fingerprint sensor array from the lens center area of the corresponding lens unit of the fingerprint sensor array, the reflected signal is a light signal reflected by an object above the display screen And produced.
  • An embodiment of the present disclosure provides a chip.
  • the chip includes the fingerprint identification module described above.
  • the under-screen optical fingerprint recognition module with multiple fingerprint sensing arrays and related electronic devices and chips disclosed in the present application can provide a larger field of view and fingerprint recognition area, and improve the effective fingerprint signal ratio and signal quality.
  • FIG. 1 is a functional block diagram of an embodiment of an electronic device of the present disclosure.
  • FIG. 2 is a schematic cross-sectional view of a specific embodiment of the electronic device shown in FIG. 1.
  • FIG. 3 is a schematic diagram of an embodiment of an imaging circle corresponding to the multiple lens units shown in FIG. 2.
  • FIG. 4 is a top view of a circuit block of a specific embodiment of the electronic device shown in FIG. 1.
  • FIG. 5 is a plan view of an embodiment of the arrangement of transistors included in the fingerprint sensor array and the analog front-end circuit shown in FIG. 4.
  • CT1, CT2 Central location
  • 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 characteristics.
  • the electronic device 100 includes (but is not limited to) a display screen 110 and a fingerprint recognition module 120.
  • the fingerprint recognition module 120 is disposed below the display screen. It is used to identify fingerprint information carried by an object (such as a finger; not shown) above the display screen 100.
  • the display screen 100 may send an optical signal, and the fingerprint identification module 120 may perform fingerprint identification according to the reflected signal generated by the object reflecting the optical signal.
  • the fingerprint recognition module 120 may include (but is not limited to) N lens units 122_1-122_N and a fingerprint sensing circuit 124, where N is a positive integer greater than 1.
  • the N lens units 122_1-122_N are separately disposed below the display screen 100, so that the fingerprint sensor circuit 124 can receive the lens center area (ie, the area near the optical center axis) of the N lens units 122_1-122_N. The reflected signal produced by the reflection of an object.
  • the fingerprint sensing circuit 124 may have N fingerprint sensing arrays 126_1-126_N, wherein the N fingerprint sensing arrays 126_1-126_N correspond to the N lens center regions LC_1-LC_N of the N lens units 122_1-122_N, respectively Below the N lens units 122_1-122_N. That is, the distance between the position of the optical center axis of each lens unit passing through the position of the corresponding fingerprint sensor array and the center position of the fingerprint sensor array may be less than or equal to a predetermined distance.
  • the distance between the position of the optical center axis of the lens unit 122_1 through the position of the fingerprint sensor array 126_1 and the center position of the fingerprint sensor array 126_1 may be less than or equal to the predetermined distance.
  • each fingerprint sensor array can sense the reflected signal incident on the fingerprint sensor array from the lens center area of the corresponding lens unit according to the touch input of the object above the display screen 110 to generate a sensor output ( That is, one of the multiple sensor outputs SR_1-SR_N).
  • the fingerprint sensor circuit 124 may further include a driving circuit 127 and a processing circuit 128.
  • the driving circuit 127 is coupled to the N fingerprint sensor arrays 126_1-126_N for enabling the fingerprint sensor pixels in each fingerprint sensor array.
  • each fingerprint sensing array may include multiple fingerprint sensing pixels arranged in multiple rows and multiple columns.
  • the driving circuit 127 may include N line scanning circuits (not shown). The N line scanning circuits are respectively coupled to the N fingerprint sensor arrays 126_1-126_N, wherein each line scanning circuit is used to drive a corresponding fingerprint sensor The array has multiple rows of fingerprint sensing pixels.
  • the processing circuit 128 is coupled to the N fingerprint sensor arrays 126_1-126_N, and is used to perform related signal processing (eg, noise reduction processing, analog-to-digital conversion operations) on the sensor outputs generated by each of the N fingerprint sensor arrays 126_1-126_N. And/or digital image processing) to identify fingerprint information.
  • related signal processing eg, noise reduction processing, analog-to-digital conversion operations
  • the N fields of view of the N lens regions LC_1-LC_N may cover the fingerprint recognition area DA on the display screen 110.
  • the fingerprint information located in the fingerprint recognition area DA can be transmitted to the fingerprint sensing circuit 120 through the lens core area of the lens unit.
  • the optical fingerprint recognition scheme proposed by the present disclosure increases the overall field of view (or visual field by adding multiple fingerprint sensor arrays and multiple lens core areas) Field angle), instead of increasing the size of a single fingerprint sensor array and lens, not only can a wide range of fingerprint recognition areas be realized when a thin fingerprint recognition module is used, but also has a good modulation transfer function (modulation transfer function) , MTF) value. Further explanation is as follows.
  • FIG. 2 is a schematic cross-sectional view of an embodiment of the electronic device 100 shown in FIG. 1.
  • the details of the fingerprint identification module 120 shown in FIG. 1 are described below with two adjacent fingerprint sensor arrays 126_1 and 126_2 (that is, N equals 2).
  • N the number of adjacent fingerprint sensor arrays 126_1 and 126_2
  • FIG. 2 the structure involved in any two of the N fingerprint sensor arrays 126_1-126_N shown in FIG. 1 and the corresponding lens unit after reading the disclosure (That is, the case where N is greater than 2) can be implemented using the structure shown in FIG. 2.
  • the lens area 122_1 of the lens unit 122_1 (the area near the optical center axis OC_1) has the first field of view FV1
  • the lens area 122_2 (the area near the optical center axis OC_2) of the lens unit 122_2 has The second field of view FV2, where the first field of view FV1 and the second field of view FV2 can be combined into a larger field of view FV, which is equivalent to the fingerprint recognition module 120 having a larger field of view, so it can realize a large area of fingerprint recognition area.
  • At least one of the lens unit 122_1 and the lens unit 122_2 may be various types of thin lenses, such as a convex lens, a single lens, or a compound lens, to reduce the thickness of the optical identification system.
  • the fingerprint recognition module 120 can not only have a thinner thickness, but also provide a large area fingerprint recognition area.
  • the first field of view FV1 and the second field of view FV2 correspond to the core area LC_1 of the lens unit 122_1 and the core area LC_2 of the lens unit 122_2, respectively, imaging in the field of view FV will have good illuminance. Even if the background light signal has a greater intensity, the fingerprint sensor circuit 124 can still detect the reflected signal carrying fingerprint information from the received signal.
  • the display screen 110 may include, but is not limited to, a cover glass 212 and a screen structure 214 (such as a display screen structure or a display touch screen structure).
  • the screen structure 214 may include a display module 216 and a light transmission hole structure 218.
  • the display module 216 includes a light-emitting unit (such as an organic light-emitting diode (OLED); not shown) and a display pixel array (not shown).
  • the light-emitting unit is used to generate an optical signal LS.
  • the display pixel array has display pixels (not shown) arranged in multiple rows and columns.
  • the light transmission hole structure 218 has a plurality of light transmission holes, and allows the first reflected signal LR1/second reflected signal LR2 (generated by the finger F to reflect the light signal LS) to reach the lens unit 122_1/122_2 through the display screen 110. Since the first field of view FV1 of the mirror area LC_1 and the second field of view FV2 of the core area LC_2 can cover the fingerprint recognition area DA on the display screen 110, all fingerprint images collected in the fingerprint recognition area DA can have Good illuminance. Even if the background light signal has a greater intensity, the fingerprint sensor circuit 124 can detect the first reflected signal LR1/second reflected signal LR2 carrying fingerprint information from the received signal (carrying the background light signal).
  • the reflected signals LR1/LR2 can be incident on the lens units 122_1/122_2 from within the visual field range FV based on a small incident angle. In this way, the situation in which the first reflected signal LR1/the second reflected signal LR2 enters the lens unit 122_1/122_2 at a large angle can be reduced. Further, due to the influence of the screen polarizer in the display screen 110, the reflected light incident on the lens unit 122_1/122_2 at a large angle will be greatly attenuated. Therefore, adopting the respective fields of view of the plurality of lens core regions to form a larger field of view can increase the reflected light component incident on the lens unit 122_1/122_2 at a small angle, thereby increasing the ratio of effective signals.
  • the distance DS between the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 (in terms of the respective center positions CT1 and CT2 of the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 The distance between them may be less than or equal to a predetermined distance, so that there may be an overlapping field of view OL between the first field of view FV1 and the second field of view FV2. Therefore, both the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 can collect fingerprint information located in the overlapping field of view OL.
  • FIG. 3 is a schematic diagram of an embodiment of image circles C1 and C2 corresponding to the lens unit 122_1 and the lens unit 122_2 shown in FIG. 2.
  • the image I1 corresponding to the lens unit 122_1 is imaged within the imaging circle C1, where the imaging circle C1 corresponds to the first field of view FV1.
  • the image I2 corresponding to the lens unit 122_2 is imaged within the imaging circle C2, where the imaging circle C2 corresponds to the second field of view FV2. Since there is an overlapping area CO between the imaging circle C1 and the imaging circle C2, both the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 can collect fingerprint information located in the overlapping field of view OL.
  • the fingerprint sensor array 126_1 can sense the first reflection signal LR1 incident on the fingerprint sensor array 126_1 from the overlapping field of view OL through the lens unit 122_1, which can be used to generate a partial image of the image I1 corresponding to the overlapping area CO.
  • the fingerprint sensor array 126_2 can sense the second reflection signal LR2 incident on the fingerprint sensor array 126_2 from the overlapping field of view OL through the lens unit 122_2, which can be used to generate a partial image of the image I2 corresponding to the overlapping area CO.
  • the fingerprint sensor circuit 124 may perform subsequent signal processing according to the first reflected signal LR1 and the second reflected signal LR2.
  • the fingerprint sensing circuit 124 may determine the fingerprint depth information of the finger in the overlapping field of view OL according to the first reflected signal LR1 and the second reflected signal LR2.
  • the fingerprint sensor circuit 124 (or the processing circuit 128 shown in FIG. 1) can perform disparity estimation based on the phases of the first reflected signal LR1 and the second reflected signal LR2, and determine that the finger is in the overlapping field of view OL Fingerprint depth information inside.
  • the fingerprint depth information can be used for fingerprint anti-counterfeiting detection.
  • the fingerprint sensing circuit 124 may determine the collected fingerprint image Is a real fingerprint.
  • the fingerprint sensor circuit 124 may perform other signal processing according to the first reflected signal LR1 and the second reflected signal LR2, such as the combined fingerprint sensor array 126_1 and The fingerprint images obtained by the fingerprint sensor array 126_2 respectively.
  • the electronic device 400 has two adjacent fingerprint sensor arrays 126_1 and 126_2 shown in FIG. 1 (that is, N is equal to 2) for convenience of description, and the fingerprint identification structure shown in FIG. 2 may be used.
  • N is equal to 2
  • the electronic device 400 may have more than two fingerprint sensing arrays (ie, N is greater than 2).
  • the distance between two adjacent fingerprint sensor arrays 126_1 and 126_2 can be adjusted according to design requirements. That is, the lens units (not shown) corresponding to the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 may have overlapping or separated fields of view.
  • the electronic device 400 includes a controller (such as a digital controller) 421, a plurality of line scan circuits 422_1 and 422_2, a plurality of analog front-end circuits (analog front-end circuits (AFE) 424_1 and 424_2, a plurality of Analog-to-digital converters 426_1 and 426_2 and a buffer circuit 428, in which multiple analog front-end circuits 424_1 and 424_2, multiple analog-to-digital converters (ADC) 426_1 and 426_2 and buffer circuit 428 can be operated by The controller 421 controls. At least a part of the driving circuit 127 shown in FIG.
  • AFE analog front-end circuits
  • ADC analog-to-digital converters
  • FIG. 1 may be implemented by a plurality of row scanning circuits 422_1 and 422_2. At least a part of the processing circuit 128 shown in FIG. 1 may be implemented by the controller 421, a plurality of analog front-end circuits 424_1 and 424_2, a plurality of analog-to-digital converters 426_1 and 426_2, and a buffer circuit 428.
  • the fingerprint sensor arrays 126_1 and 126_2 may each include a plurality of fingerprint sensor pixels (labeled as "PF") arranged in multiple rows and columns.
  • the row scanning circuit 422_1 is used to scan multiple rows of fingerprint sensing pixels of the fingerprint sensing array 126_1 to enable corresponding fingerprint sensing pixels.
  • the row scanning circuit 422_2 is used to scan multiple rows of fingerprint sensing pixels of the fingerprint sensing array 126_2 to enable corresponding fingerprint sensing pixels.
  • the multiple analog front-end circuits 424_1 and 424_2 are respectively coupled to the multiple fingerprint sensor arrays 126_1 and 126_2. Each analog front-end circuit is used to process the sensor output generated by multiple rows of fingerprint sensor pixels in the corresponding fingerprint sensor array, for example, to perform integration processing on the sensor output.
  • the multiple analog-to-digital converters 426_1 and 426_2 can receive the sensor outputs (ie, analog sensor outputs) from the multiple analog front-end circuits 424_1 and 424_2, respectively, and perform analog conversion operations to generate corresponding digital signals.
  • the buffer circuit 428 can store the digital signals generated by the multiple analog-to-digital converters 426_1 and 426_2 for subsequent fingerprint identification.
  • the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 can be rotated by a predetermined angle relative to the display screen 110 (or analog front-end circuit 424_1/424_2), thereby obtaining higher pixel resolution , To reduce the moiré pattern caused by undersampling.
  • the display pixel array 416 (eg, located in the display module 216 shown in FIG. 2) included in the display screen 110 is arranged in multiple rows and columns of multiple display pixels (marked as "PD"), of which multiple rows Display pixels can be set along the X-axis direction, and multiple columns of display pixels can be set along the Y-axis direction.
  • PD display pixels
  • the multiple rows of display pixels of the display pixel array 416 are arranged parallel to the first direction D1 (ie, the X-axis direction)
  • the multiple rows of fingerprint sensing pixels of the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 may be parallel to
  • the second direction D2 is set, wherein the second direction D2 is different from the first direction D1.
  • the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 are both rotated by a predetermined angle so that the first direction D1 and the first direction D2 have a predetermined included angle (ie, the Predetermined angle).
  • the predetermined angle may be greater than 0 degrees and less than or equal to 45 degrees, or determined according to design requirements.
  • the adjacent Since the predetermined angle is between the display pixel array 416 and the fingerprint sensor array 126_1 (or fingerprint sensor array 126_2), for the fingerprint sensor array 126_1 (or fingerprint sensor array 126_2), the adjacent When the distance between the two fingerprint sensing pixels is unchanged, it is equivalent to increasing the distance between two adjacent display pixels in the display pixel array 416, thereby reducing the spatial sampling rate of the display pixel array 416 to reduce Moiré due to undersampling. This is also equivalent to improving the pixel resolution of the fingerprint identification module 420.
  • FIG. 5 is a plan view of an embodiment of the arrangement of the transistors included in the fingerprint sensor array 126_1 and the analog front-end circuit 424_1 shown in FIG. 4.
  • the analog front-end circuit 424_1 includes a transistor M1, which may be implemented by (but not limited to) a metal oxide half field effect transistor having a gate G1, a source S1, and a drain D1.
  • the current direction of the transistor M1 (i.e., the direction in which the current channel extends between the source S1 and the drain D1) is parallel to the first direction D1'.
  • the fingerprint sensor array 126_1 includes a transistor M2 (for example, a transistor coupled to a photodiode), which may be implemented by, but not limited to, a metal oxide half field effect transistor having a gate G2, a source S2, and a drain D2.
  • the current direction of the transistor M2 (ie, the extending direction of the current channel between the source S2 and the drain D2) is parallel to the first direction D2', wherein the first direction D1' and the first direction D2' have a predetermined included angle AG, the predetermined angle may be greater than 0 degrees and less than or equal to 45 degrees, or determined according to design requirements.
  • the arrangement of the fingerprint sensor array 126_2 and the analog front-end circuit 424_2 can also be implemented based on the transistor arrangement shown in FIG. 5.
  • the fingerprint sensor array 126_1 and the fingerprint sensor array 126_2 may have different rotation angles.
  • the analog front-end circuit 424_1/424_2 can also rotate with the corresponding fingerprint sensor array 126_1/126_2.
  • multiple digital-to-analog converters 426_1 and 426_2 can also be implemented by a multiplexer with a single digital-to-analog converter (i.e., using time-sharing processing).
  • the present application also provides a chip including the fingerprint identification module 120 shown in FIG. 1 or the fingerprint identification module 420 shown in FIG. 4.
  • the fingerprint sensing circuit 124 included in the fingerprint recognition module 120 may be implemented by a semiconductor chip, and the optical system included in the fingerprint recognition module 120 (ie, a plurality of lens units 122_1- 122_N) can be integrated into the semiconductor chip to realize a silicon photonic chip (silicon photonic chip).
  • the fingerprint recognition scheme proposed in the present disclosure can set a plurality of fingerprint sensor arrays on the same sensor chip, and correspondingly set lens units on each fingerprint sensor array, when using a thinner fingerprint In the case of an identification module, it provides a larger field of view and fingerprint identification area.
  • the fingerprint recognition scheme proposed by the present disclosure increases the ratio of effective fingerprint signals and signal quality by increasing the number of mirror core regions.
  • the fingerprint identification scheme proposed in the present disclosure can perform fingerprint anti-counterfeiting detection through overlapping fields of view, and can also rotate the fingerprint sensor array by a predetermined angle to obtain higher pixel resolution and reduce the generation of moiré.

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Abstract

L'invention concerne des modules de reconnaissance d'empreintes digitales (120, 420), des dispositifs électroniques (100, 400) et une puce. Les modules de reconnaissance d'empreintes digitales (120, 420) sont disposés sous un écran d'affichage (110). Les modules de reconnaissance d'empreintes digitales (120, 420) comprennent N unités de lentilles (122_1 - 122_N) et un circuit de capteur d'empreintes digitales (124), N étant un nombre entier positif supérieur à 1. Les N unités de lentilles (122_1 - 122_N) sont disposées séparément sous l'écran d'affichage (110). Le circuit de capteur d'empreintes digitales (124) est pourvu de N réseaux de capteurs d'empreintes digitales (126_1 - 126_N), lesdits N réseaux de capteurs d'empreintes digitales (126_1 - 126 _N) correspondant respectivement à N zones centrales de lentilles (LC_1 - LC_N) des N unités de lentilles (122_1 - 122_N) et étant disposées sous les N unités de lentilles (122_1 - 122_N). Les modules de reconnaissance d'empreintes digitales (120, 420) fournissent un plus large champ de vision (FV) et une plus large zone de reconnaissance d'empreintes digitales (DA), et augmentent la proportion et la qualité de signal des signaux d'empreintes digitales efficaces.
PCT/CN2018/123744 2018-12-26 2018-12-26 Modules de reconnaissance d'empreintes digitales, dispositifs électroniques et puce WO2020132914A1 (fr)

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PCT/CN2018/123744 WO2020132914A1 (fr) 2018-12-26 2018-12-26 Modules de reconnaissance d'empreintes digitales, dispositifs électroniques et puce
CN201880003036.1A CN109791609A (zh) 2018-12-26 2018-12-26 指纹识别模块、电子设备和芯片

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CN108460349A (zh) * 2017-02-22 2018-08-28 辛纳普蒂克斯公司 用于减轻莫尔效应的显示器下光学指纹传感器布置结构

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