WO2018145255A1 - Terminal intelligent, capteur d'empreintes digitales capacitif et module de détection associé - Google Patents

Terminal intelligent, capteur d'empreintes digitales capacitif et module de détection associé Download PDF

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Publication number
WO2018145255A1
WO2018145255A1 PCT/CN2017/073079 CN2017073079W WO2018145255A1 WO 2018145255 A1 WO2018145255 A1 WO 2018145255A1 CN 2017073079 W CN2017073079 W CN 2017073079W WO 2018145255 A1 WO2018145255 A1 WO 2018145255A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive
sensing
fingerprint sensor
capacitive fingerprint
sensing module
Prior art date
Application number
PCT/CN2017/073079
Other languages
English (en)
Chinese (zh)
Inventor
张欣
朱奇良
简卫
Original Assignee
深圳市飞仙智能科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市飞仙智能科技有限公司 filed Critical 深圳市飞仙智能科技有限公司
Priority to CN201780000028.7A priority Critical patent/CN107004127A/zh
Priority to PCT/CN2017/073079 priority patent/WO2018145255A1/fr
Publication of WO2018145255A1 publication Critical patent/WO2018145255A1/fr

Links

Classifications

    • 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
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing

Definitions

  • the present invention belongs to the field of fingerprint identification, and in particular, to an intelligent terminal, a capacitive fingerprint sensor and a sensing module thereof.
  • fingerprint sensors based on fingerprint recognition technology are widely used in various smart terminals (such as mobile phones, tablet computers, etc.).
  • Capacitive fingerprint sensors have become the mainstream of fingerprint recognition applications due to their low device thickness, low cost and low power consumption.
  • the sensing module includes a sensing array ij1 arranged by a plurality of sensing units 11 and an insulating medium 2 overlying the sensing array ijl.
  • the control module controls the plurality of sensing units 11 to sense fingerprint information of a plurality of points contacting the finger on the insulating medium 2, respectively.
  • the sensing unit 11 includes a conductive electrode plate 110 and a measuring circuit 111.
  • a capacitance CS is formed between the finger and the plurality of conductive electrode plates 110, due to the fingerprint.
  • the distance between the crests and troughs and the conductive plate 110 is not equal. Therefore, the peaks and troughs of the fingerprint are different from the capacitance Cs of the capacitance CS formed by the conductive plate 110, and the measuring circuit 111 forms the conductive plate 110 and the fingers.
  • the capacitance of the capacitor is converted to a voltage signal and a measured value Vo representing the peak or valley of the fingerprint is output.
  • the reading module reads and processes the measured values output by the plurality of sensing units 11 to obtain complete fingerprint information.
  • Vb is a preset voltage value raised by the power supply voltage during the measurement period
  • Cf is a capacitance value of the feedback capacitor CF.
  • Vo cannot be too small.
  • Cf should not be too small; and the preset voltage value Vb is limited by reliability and cost. Therefore, under the same conditions, it is a preferred solution to increase Cs.
  • the size of the single sensing unit 11 cannot be made large, that is, the area of the conductive electrode plate 110 cannot be too large.
  • the capacitance value of the capacitor is proportional to the plate area of the capacitor, and the distance between the plate and the plate is inversely proportional to the dielectric constant.
  • the medium commonly used in the industry is tempered glass, that is, the dielectric constant is basically fixed. Therefore, the purpose of increasing Cs can be achieved only by shortening the distance between the electrode plate 110 and the finger, that is, reducing the thickness of the medium, thereby causing the fingerprint sensor not to support a higher medium thickness.
  • the existing capacitive fingerprint sensor has a problem that it does not support a higher dielectric thickness.
  • An object of the present invention is to provide a smart terminal, a capacitive fingerprint sensor and a sensing module thereof, which aim to solve the problem that the existing capacitive fingerprint sensor does not support a higher medium thickness.
  • the present invention is implemented as a sensing module of a capacitive fingerprint sensor, including a sensing array that is arranged in two dimensions by a plurality of sensing units and overlying the sensing array.
  • the sensing unit includes a conductive electrode plate and a measuring circuit electrically connected to the conductive electrode plate; and the measuring circuit contacts the conductive electrode plate with the insulating medium during a sensing period
  • the capacitance value of the capacitance formed between the fingers is converted into a voltage signal, and a measurement value corresponding to a peak or a trough of the fingerprint of the finger is output;
  • the upper surface of the conductive electrode plate is provided with a plurality of first surfaces having a predetermined thickness a conductive element, and any two adjacent first conductive elements are spaced apart by a predetermined distance;
  • a sensing area of the conductive plate is an area of an upper surface of the first conductive element, a side of the first conductive element The area of the conductive plate and the
  • the present invention also provides a capacitive fingerprint sensor, comprising a reading module and a control module, the capacitive fingerprint sensor further comprising the sensing module described above;
  • the sensing module is connected to the reading module and the control module
  • the control module controls the sensing module to sense the fingerprint information of the finger during the sensing period; the reading module reads the measured value output by the sensing module to obtain Fingerprint information of the finger.
  • the present invention also provides an intelligent terminal, which includes the above capacitive fingerprint sensor.
  • the present invention provides a plurality of preset thicknesses on the conductive plates of the sensing unit of the capacitive fingerprint sensor.
  • the first conductive element of the degree since any two adjacent first conductive elements are spaced apart by a predetermined distance, the area of the side surface of the first conductive element can be effectively utilized, so that the size of the conductive plate is constant.
  • the effective sensing area of the conductive plate not only improves the penetrating ability of the fingerprint sensor, but also enables it to support a higher dielectric thickness.
  • FIG. 1 is a top view of a capacitive fingerprint sensor provided by the prior art and the embodiment of the present invention
  • FIG. 1b is a cross-sectional view of a sensing module of the capacitive fingerprint sensor provided by the prior art
  • FIG. 2 is a cross-sectional view of a sensing module of a capacitive fingerprint sensor according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view of a sensing module of a capacitive fingerprint sensor according to another embodiment of the present invention.
  • FIG. 4 is a sensing module of a capacitive fingerprint sensor according to an embodiment of the present invention; a top view of the conductive plate in the middle;
  • FIG. 5 is a top plan view of a conductive electrode plate in a sensing module of a capacitive fingerprint sensor according to another embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of a capacitive fingerprint sensor according to an embodiment of the present invention.
  • FIG. 2 is a top view of a capacitive fingerprint sensor according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a circuit structure of a sensing module of a capacitive fingerprint sensor according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a circuit structure of a sensing module of a capacitive fingerprint sensor according to an embodiment of the present invention.
  • a sensing module 100 of a capacitive fingerprint sensor includes a sensing array 1 that is arranged in two dimensions by a plurality of sensing units 11 and covers all of the sensing array 1 The insulating medium 2 above the sensing unit 11.
  • the sensing array 1 may be arranged by a plurality of sensing units 11 in a two-dimensional matrix.
  • the insulating medium 2 may be an insulating medium such as tempered glass or plastic, and may also be other insulating media. It is determined according to actual needs, and there is no restriction here.
  • the sensing unit 11 includes a conductive electrode plate 110 and a measuring circuit electrically connected to the conductive electrode plate 110.
  • the measuring circuit 111 converts the capacitance value Cs of the capacitance CS formed between the conductive electrode plate 110 and the finger contacting the insulating medium 2 into a voltage signal, and outputs a peak or a valley corresponding to the fingerprint of the finger.
  • the measured value is Vo.
  • the upper surface of the electrode plate 110 is provided with a plurality of first conductive elements 112 having a predetermined thickness, and any two adjacent first conductive elements 112 are spaced apart by a predetermined distance; the sensing area of the conductive plate 110 is determined by The area of the upper surface of the first conductive element 112, the area of the side surface of the first conductive element 112, and the preset distance are determined together.
  • S1 is the area of the upper surface of the first conductive member 112
  • S2 is the area of the side surface of the first conductive member 112
  • S3 is the total area of the portion of the upper surface of the conductive electrode plate 110 that is not blocked by the first conductive member 110.
  • the upper surface of the conductive electrode plate 110 is the opposite side of the conductive electrode plate 110 from the insulating medium 2.
  • the preset distances of any two adjacent first conductive elements 112 may be equal.
  • the preset thickness can also be set according to actual needs, and no specific limitation is made here.
  • the first conductive member 112 may be integrally formed with the conductive electrode plate 110.
  • FIG 3 is a cross-sectional view of a sensing module of a capacitive fingerprint sensor according to another embodiment of the present invention.
  • the first conductive element 112 may pass through the second conductive element.
  • the conductive plate 110, the first conductive element 112, and the second conductive element 113 may all be made of metal.
  • the conductive electrode plate 110, the first conductive element 112, and the second conductive element 113 may also be made of other conductive materials, which are not limited herein.
  • the second conductive element 113 may be a conductive via.
  • the input end of the sensing circuit 111 is electrically connected to the conductive electrode plate 110, and the output end of the sensing circuit 111 outputs a measured value Vo.
  • the sensing circuit 111 can use an existing sensing circuit including a switching SW, a feedback capacitor CF, and an amplifier AMP.
  • the first end of the SW, the first end of the feedback capacitor CF, and the inverting input of the amplifier AMP are commonly connected as an input end of the sensing circuit 111, and the second end of the SW and the feedback capacitor CF are The output terminals of the two terminals and the amplifier AMP are connected in common as the output end of the sensing circuit 111, and the non-inverting input terminal of the amplifier AMP is connected to the reference voltage Vref.
  • FIG. 4 is a top view of a conductive electrode plate in a sensing module of a capacitive fingerprint sensor according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a capacitive fingerprint sensor according to another embodiment of the present invention.
  • a top view of the conductive plates in the module For the convenience of description, only the parts related to the embodiment of the present invention are shown, which are as follows:
  • the first conductive member 112 may be a rectangular parallelepiped.
  • the first conductive element 112 can be a cube.
  • the first conductive element 112 may also be a cylinder. specific
  • It can be a cylinder or a prism, etc., and there are no restrictions here.
  • the first conductive element 112 may also be a stage (not shown), such as a prism or a truncated cone, etc., and is specifically set according to actual needs, and is not limited herein.
  • the second conductive element 113 may be a rectangular parallelepiped or a cylinder, etc., and is specifically set according to actual needs, and is not limited herein.
  • a plurality of first conductive elements 112 are arranged in a matrix of m rows x n columns; any two adjacent first conductive elements 112 of each row of first conductive elements 112 are spaced first.
  • the preset distance dl is equal to any two adjacent first conductive elements 112 of each column of the first conductive elements 112 being separated by a second predetermined distance d2.
  • the first preset distance d1 and the second preset distance d2 may be equal or incompatible. It is determined according to actual needs, and there is no restriction here. For example, assuming that the length and width of the conductive plate 110 are both 50 ⁇ m (micrometers) and the first conductive member 112 is a rectangular parallelepiped, the first conductive member may be disposed.
  • the length and width of 112 are both 0.5 ⁇ , and the thickness is ⁇ ; the first preset distance dl and the second preset distance d2 are both 0.
  • FIG. 6 is a schematic diagram of an embodiment of the present invention. A cross-sectional view of a capacitive fingerprint sensor. For the convenience of description, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:
  • a capacitive fingerprint sensor 1000 includes a reading module 200 and a control module 300.
  • the capacitive fingerprint sensor 1000 further includes the sensing module 100 described above.
  • sensing module 100 is connected to the reading module 200 and the control module 300.
  • the control module 300 controls the sensing module 100 to sense the fingerprint information of the finger during the sensing period; the reading module 200 reads the measured value output by the sensing module 100 to acquire the fingerprint information of the finger.
  • control module 300 and its control logic may be the same as the control module and control logic in the existing capacitive fingerprint sensor.
  • the control module 300 can control the sensing module 100 to sense the fingerprint information of the finger by raising the power voltage and the ground voltage of the fingerprint sensor, and can also control the sensing module 100 by adding an excitation signal to the finger.
  • the fingerprint information of the finger is sensed, and the sensing information of the finger can be sensed by the sensing module 100 by adding an excitation signal to the non-inverting input end of the amplifier AMP. It can be set according to actual needs, and there is no restriction here.
  • the read module 300 can employ an existing read circuit including a sample and hold circuit (S/H circuit) and an analog to digital converter (ADC). Set according to actual needs, no restrictions here.
  • S/H circuit sample and hold circuit
  • ADC analog to digital converter
  • the embodiment of the invention further provides an intelligent terminal, which comprises the above-mentioned capacitive fingerprint sensor.
  • the smart terminal may be a terminal such as a mobile phone or a tablet computer, and may also be other terminals, and is not limited herein.
  • control module 300 controls the plurality of sensing units 11 (for ease of observation)
  • sensing unit 300 Only one sensing unit is shown in the figure to sense the fingerprint information of a plurality of points contacting the finger on the insulating medium 2, respectively.
  • the following describes the entire sensing process by taking the method in which the control module 300 senses the fingerprint by raising the power voltage and the ground voltage as an example:
  • a conductive element 112 is a rectangular parallelepiped, and the first conductive element 112 has a length and a width of 0.5 ⁇ m and a thickness of 1 ⁇ m.
  • the calculation method of the sensing area S of the conductive electrode plate 110 is based on the premise that the sensing distance d is much larger than the thickness of the first conductive element 112. Under this premise, the first conductive The thickness of element 112 is negligible.
  • the capacitive fingerprint sensor provided by the embodiment of the present invention improves the fingerprint detection accuracy by increasing Cs, and ensures that the fingerprint sensor can support higher when the overall size of the conductive electrode plate 110 is kept unchanged. Medium thickness.
  • a plurality of first conductive elements having a predetermined thickness are disposed on a conductive plate of the sensing unit of the capacitive fingerprint sensor, because any two adjacent first conductive elements are separated by a predetermined distance. Therefore, the area of the side surface of the first conductive element can be effectively utilized, so that the effective sensing area of the conductive electrode plate is increased without changing the size of the conductive electrode plate, thereby improving the penetration capability of the fingerprint sensor. It also allows it to support higher media thicknesses.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

L'invention concerne un terminal intelligent, un capteur d'empreintes digitales capacitif et un module de détection associé, qui se rapportent au domaine de la reconnaissance d'empreintes digitales. Le module de détection (100) comprend un réseau de détection (1) et un milieu isolant (2) recouvrant le réseau de détection (1). Plusieurs premiers éléments conducteurs (112) d'une épaisseur prédéfinie sont disposés sur une plaque conductrice (110) d'une unité de détection (11). En raison d'une distance prédéfinie entre deux premiers éléments conducteurs (112) adjacents, la superficie de surfaces latérales des premiers éléments conducteurs (112) peut être utilisée efficacement, de telle sorte que la zone de détection effective de la plaque conductrice (110) augmente alors que la taille de la plaque conductrice (110) ne change pas, ce qui permet non seulement d'améliorer la capacité de pénétration d'un capteur d'empreintes digitales, mais aussi d'accepter une épaisseur de milieu plus importante.
PCT/CN2017/073079 2017-02-08 2017-02-08 Terminal intelligent, capteur d'empreintes digitales capacitif et module de détection associé WO2018145255A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780000028.7A CN107004127A (zh) 2017-02-08 2017-02-08 一种智能终端、电容式指纹传感器及其感测模块
PCT/CN2017/073079 WO2018145255A1 (fr) 2017-02-08 2017-02-08 Terminal intelligent, capteur d'empreintes digitales capacitif et module de détection associé

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Application Number Priority Date Filing Date Title
PCT/CN2017/073079 WO2018145255A1 (fr) 2017-02-08 2017-02-08 Terminal intelligent, capteur d'empreintes digitales capacitif et module de détection associé

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CN109886115B (zh) * 2019-01-18 2021-04-20 江西沃格光电股份有限公司 指纹识别模组、显示模组以及显示终端
CN219039787U (zh) * 2021-01-15 2023-05-16 深圳市汇顶科技股份有限公司 生物信息识别装置及电子设备

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CN106249973A (zh) * 2016-07-20 2016-12-21 京东方科技集团股份有限公司 一种内嵌式触摸屏、其驱动方法及显示装置

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TWI526945B (zh) * 2014-08-26 2016-03-21 神盾股份有限公司 電容式指紋感測裝置及其指紋感測方法
US10325131B2 (en) * 2015-06-30 2019-06-18 Synaptics Incorporated Active matrix capacitive fingerprint sensor for display integration based on charge sensing by a 2-TFT pixel architecture
CN105138988B (zh) * 2015-08-26 2020-02-21 京东方科技集团股份有限公司 互容式指纹识别器件及制备方法、显示面板及显示设备

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US20160314334A1 (en) * 2015-04-23 2016-10-27 Shenzhen Huiding Technology Co., Ltd. Multifunction fingerprint sensor
CN105138986A (zh) * 2015-08-25 2015-12-09 敦泰电子有限公司 一种指纹检测电路、指纹检测装置及触控面板
CN105095887A (zh) * 2015-09-16 2015-11-25 京东方科技集团股份有限公司 一种指纹识别模组及指纹识别方法、显示装置
CN205563607U (zh) * 2015-11-05 2016-09-07 比亚迪股份有限公司 指纹检测装置及电子装置
CN106249973A (zh) * 2016-07-20 2016-12-21 京东方科技集团股份有限公司 一种内嵌式触摸屏、其驱动方法及显示装置

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