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WO2018062956A1 - Dispositif de capteur capacitif - Google Patents

Dispositif de capteur capacitif Download PDF

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Publication number
WO2018062956A1
WO2018062956A1 PCT/KR2017/011007 KR2017011007W WO2018062956A1 WO 2018062956 A1 WO2018062956 A1 WO 2018062956A1 KR 2017011007 W KR2017011007 W KR 2017011007W WO 2018062956 A1 WO2018062956 A1 WO 2018062956A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
capacitance
sensor device
charge amplifier
signal
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2017/011007
Other languages
English (en)
Korean (ko)
Inventor
문병권
이재표
김태운
고진석
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SEMISENS Co Ltd
Original Assignee
SEMISENS Co Ltd
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 SEMISENS Co Ltd filed Critical SEMISENS Co Ltd
Publication of WO2018062956A1 publication Critical patent/WO2018062956A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector

Definitions

  • the present invention relates to a capacitive sensor device, and more particularly, mutual capacitance (reduced upon touch of a conductor or fingerprint) and magnetic capacitance (touch of a conductor) instead of a feedback capacitance, which is a fixed capacitance. Or increase when the fingerprint is touched), so that the output signal value of the charge amplifier is larger than when using the feedback capacitance to improve the sensitivity, and the compactness is achieved by using no capacitor to amplify the signal.
  • the present invention relates to a capacitive sensor device capable of preventing a loss of a signal due to metal packaging of a terminal device by applying a driving voltage therein.
  • a capacitive sensor device that calculates coordinates of a touch point, recognizes a fingerprint, or calculates touch pressure by using capacitance change has been widely developed.
  • FIG. 1 is a schematic configuration diagram of a sensor device using a conventional capacitance change.
  • a sensor device using a conventional capacitance change is described.
  • the sensor device touches a driving voltage. It is applied to the panel 100 to detect the capacitance change caused by touch, fingerprint contact, etc. to calculate the coordinates or pressure or to recognize the fingerprint, the signal output from the touch panel 100 is a charge amplifier 200 Amplified and analyzed by a controller (not shown).
  • the charge amplifier 200 includes an operational amplifier 210 and a capacitor 220 positioned between an inverting input terminal ( ⁇ ) and an output terminal of the operational amplifier, and an output signal amplified and output to the charge amplifier 200. (Vout) becomes equal to Equation 1 below.
  • Vout -(CS / CFB) ⁇ Vin
  • CS is the capacitance of the touch panel
  • CFB is the feedback capacitance
  • Vin is the input signal
  • the touch panel 100 is positioned above the display (not shown) and packaged to form a terminal device (not shown), and a driving voltage is provided through the metal bezel (not shown) of the touch panel 100.
  • the packaging of the terminal device is made of metal (that is, the When the housing (not shown) is made of metal) and a driving voltage applied by a finger is distributed to the housing and the sensor electrode, signal loss occurs.
  • the present invention has been made to solve the above problems,
  • the present invention uses mutual capacitance (decreased on touch of a conductor or fingerprint) and magnetic capacitance (increase on touch of a conductor or fingerprint) instead of a feedback capacitance which is a fixed capacitance. It is an object of the present invention to provide a capacitive sensor device capable of improving sensitivity by making an output signal value of an amplifier larger than when using a feedback capacitance.
  • an object of the present invention is to provide a capacitive sensor device that can be made compact by not using a capacitor in amplifying a signal.
  • Another object of the present invention is to provide a capacitive sensor device capable of preventing a loss of a signal due to metal packaging of a terminal device by applying a driving voltage therein.
  • the present invention is implemented by the embodiment having the following configuration to achieve the above object.
  • the capacitive sensor device is a sensor unit for receiving a signal and outputs a signal according to the capacitance changes according to the user's touch, and the sensor is connected to the sensor And a charge amplifier for amplifying and outputting a signal output from the unit, wherein the sensor unit includes a plurality of sensor arrays spaced at a predetermined interval, and the sensor array includes a pair of sensor electrodes spaced at a predetermined interval.
  • the sensor electrode is connected to the inverting input terminal (-) of the charge amplifier and the other sensor electrode is connected to the output terminal of the charge amplifier.
  • the sensor array further surrounds the sensor electrode and further includes a guide electrode for preventing parasitic capacitance from occurring between adjacent sensor arrays. It is characterized by including.
  • CM mutual capacitance
  • the magnetic capacitance CF formed at one sensor electrode connected to the inverting input terminal of the charge amplifier is increased.
  • the mutual capacitance CM is decreased, so that the sensitivity can be improved by making the output signal value of the charge amplifier larger than when using the feedback capacitance.
  • the capacitive sensor device is characterized by applying a signal to the non-inverting input terminal (+) of the charge amplifier.
  • the output signal value output from the charge amplifier is characterized by the following equation (2).
  • Vout (1 + CF / CM) ⁇ Vin
  • Vout is the output signal
  • CF is the magnetic capacitance located at the sensor electrode connected to the inverting input terminal
  • CM is the mutual capacitance between the sensor electrodes
  • Vin is the input signal
  • the sensor unit further includes a bezel acting as an external electrode, characterized in that a signal is applied to the bezel.
  • the output signal value output from the charge amplifier is characterized by the following equation (3).
  • Vout -(CF / CM) ⁇ Vin
  • Vout is the output signal
  • CF is the magnetic capacitance located at the sensor electrode connected to the inverting input terminal
  • CM is the mutual capacitance between the sensor electrodes
  • Vin is the input signal
  • the capacitive sensor device is characterized in that it is used to calculate the coordinates or pressure of the touch point or to recognize the fingerprint.
  • the capacitive sensor device is located between the inverting input terminal (-) and the output terminal of the charge amplifier, and is turned on after detecting the output signal and inputting the output terminal. It further comprises a switch for initializing the voltage of the terminal.
  • the present invention can obtain the following effects by the configuration, combination, and use relationship described above with the present embodiment.
  • the present invention uses mutual capacitance (decreased on touch of a conductor or fingerprint) and magnetic capacitance (increase on touch of a conductor or fingerprint) instead of a feedback capacitance which is a fixed capacitance.
  • the sensitivity of the amplifier can be improved by making the output signal of the amplifier larger than when using the feedback capacitance.
  • the present invention has the effect that can be achieved by compacting without using a capacitor in amplifying the signal.
  • the present invention has the effect of preventing the loss of the signal by the metal packaging of the terminal device by applying a driving voltage therein.
  • FIG. 1 is a schematic configuration diagram of a sensor device using a conventional capacitance change.
  • FIG. 2 is a schematic configuration diagram of a capacitive sensor device according to an embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view of the sensor device of FIG.
  • FIG. 4 is a schematic configuration diagram of a capacitive sensor device according to another embodiment of the present invention.
  • FIG. 5 is a circuit diagram of a capacitive sensor device according to the present invention.
  • insulating layer 122 shield electrode 123: sensor array
  • FIG. 2 is a schematic configuration diagram of a capacitive sensor device according to an embodiment of the present invention
  • Figure 3 is a schematic cross-sectional view of the sensor device of Figure 2
  • Figure 4 is a capacitance according to another embodiment of the present invention
  • It is a schematic block diagram of a sensor system
  • FIG. 5 is a circuit diagram of the capacitive sensor device according to the present invention.
  • the capacitive sensor device will be described with reference to FIGS. 2 and 3, wherein the sensor device detects a user's touch and transmits a signal thereof, and the touch panel ( And a controller 2 for applying a signal (driving voltage) to 1) and amplifying and analyzing the signal output from the touch panel 1.
  • the sensor device may not only be used to calculate coordinates of a touch point, recognize a fingerprint, or calculate touch pressure by using capacitance change, but also may be used for a system for measuring various physical quantities using capacitance change.
  • the characteristics of the present invention apply a signal to the touch panel 1 to amplify and output the signal output from the touch panel 1, the output signal is analyzed to calculate coordinates or recognize a fingerprint or pressure. Since the measurement of various physical quantities of the known matters, a detailed description thereof will be omitted.
  • the touch panel 1 senses a user's touch and transmits a signal thereof, and includes a cover layer 11 and a sensor unit 12.
  • the cover layer 11 forms the uppermost surface of the touch panel 1, and transparent glass, a synthetic resin film, or the like may be applied to a part contacting a user's finger or other touch means.
  • the sensor unit 12 is positioned below the cover layer 11 to receive a driving voltage from the controller 2 and output a signal according to a capacitance that changes according to a user's touch.
  • the insulating layer 121, the shield electrode 122, and the sensor array 123 may be made of various materials.
  • the insulating layer 121 may be made of a transparent synthetic resin, and the shield electrode 122 and the sensor may be made of various materials.
  • the array 123 may be made of ITO material.
  • the insulating layer 121 is disposed below the cover layer 11 to accommodate the shield electrode 122 and the sensor array 123.
  • the insulating layer 121 is vertically partitioned by the shield electrode 122 to be disposed above. It is divided into a first insulating layer 121a and a lower second insulating layer 121b.
  • the shield electrode 122 is disposed in the insulating layer 121, that is, disposed between the first insulating layer 121a and the second insulating layer 121b to minimize parasitic capacitance. Or any other suitable pressure.
  • the shield electrode 122 is formed with a via hole 122a through which conductive wires connecting the sensor electrode 123a of the sensor array 123 and the charge amplifier 21 pass.
  • the sensor array 123 is positioned in the first insulating layer 121a and is configured to output a signal according to a capacitance changed according to a user's touch by receiving a driving voltage.
  • a plurality of layers are formed in the insulating layer 121a at regular left and right intervals.
  • the sensor array 123 includes a pair of sensor electrodes 123a spaced apart from each other at a predetermined interval, and a guide electrode 123b surrounding the sensor electrode 123a.
  • the pair of sensor electrodes 123a are spaced apart from each other at a predetermined interval, and one sensor electrode 1231 is connected to the inverting input terminal (-) of the charge amplifier 21, and the other sensor electrode 1232 is connected to the charge amplifier 21. It is connected to the output terminal of. Therefore, the charge amplifier 21 is connected to each sensor array 123.
  • the guide electrode 123b surrounds the sensor electrode 123b to minimize parasitic capacitance formed between adjacent sensor arrays 123 and is connected to a ground voltage or other suitable voltage.
  • the case (not shown) surrounds the insulating layer 121 to form an outer shape of the sensor unit 12.
  • the bezel 124 of the case may be made of metal and may serve as an external electrode. It is well known to apply the driving voltage through the bezel, so a detailed description thereof will be omitted.
  • the controller 2 is configured to apply a signal (driving voltage) to the touch panel 1 and amplify and analyze the signal output from the touch panel 1.
  • the signal supply unit (not shown) and the charge amplifier 21 ), And the like.
  • the signal supply unit (not shown) is configured to control the application of a signal (driving voltage) to the sensor electrode 123a, and as shown in FIG. 2, to the non-inverting input terminal (+) of the charge amplifier 21.
  • the signal is applied or the signal is applied to the bezel 124 as shown in FIG. 4.
  • the charge amplifier 21 is connected to the sensor unit 12 and amplifies and outputs a signal output from the sensor unit 12.
  • One charge amplifier 21 is used for each sensor array 123.
  • the inverting input terminal (-) of the charge amplifier 21 is connected to one sensor electrode 1231 and the output terminal is connected to the other sensor electrode 1232.
  • the switch 22 is connected between the inverting input terminal (-) and the output terminal, and after the output signal is detected (on) to turn on the voltage of the output terminal and the input terminal Can be initialized.
  • each of the sensor arrays 123 outputs a signal, and when the conductor touches the touch panel 1, the electrostatic The capacitance is changed to output the changed signal.
  • the controller 2 applies the driving voltage to the inside (non-inverting input terminal (+)) instead of the external electrode (bezel 124), at this time, bezel 124 ) Is connected to the ground voltage) .
  • a driving voltage is applied to the non-inverting input terminal (+)
  • the voltage is generated due to the virtual short characteristic of the non-inverting input terminal (+) and the inverting input terminal (-).
  • Vout (1 + CF / CM) ⁇ Vin
  • Vout is the output signal
  • CF is the magnetic capacitance located at the sensor electrode connected to the inverting input terminal
  • CM is the mutual capacitance between the sensor electrodes
  • Vin is the input signal
  • a coffee sheet may not be used, thereby making the sensor device compact.
  • the terminal device is packaged with metal and a driving voltage is applied through the bezel 124, which is an external electrode as in the prior art, signal loss occurs, and the sensor device supplies the driving voltage to the inside (non-inverting input terminal (+)). Can be effectively prevented from being lost.
  • power may be applied to the bezel 124.
  • the magnetic capacitance CF connected to the output terminal of the charge amplifier is a branch of a feedback factor.
  • the circuit when the driving voltage is applied to the inverting input terminal (when the driving voltage is applied to the bezel), the circuit is expressed as shown in FIG. 5B and is output from the charge amplifier 21.
  • the output signal Vout is represented by Equation 3 below. Even in this case, the output signal value can be made larger than in the case of using the feedback capacitance as in the related art, thereby improving the sensitivity.
  • Vout -(CF / CM) ⁇ Vin
  • Vout is the output signal
  • CF is the magnetic capacitance located at the sensor electrode connected to the inverting input terminal
  • CM is the mutual capacitance between the sensor electrodes
  • Vin is the input signal

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Position Input By Displaying (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

La présente invention concerne un dispositif de capteur capacitif et plus particulièrement un dispositif de capteur capacitif permettant d'améliorer la sensibilité à l'aide d'une capacité mutuelle à contact réduit avec un conducteur ou une empreinte digitale, et d'une auto-capacité, à contact augmenté avec un conducteur ou une empreinte digitale, à la place d'une capacité de rétroaction, qui constitue la capacité fixe, et qui par l'augmentation d'une valeur de signal de sortie d'un amplificateur de charge afin qu'elle soit plus grande que lors de l'utilisation de la capacité de rétroaction, peut être rendu compact sans l'utilisation d'un condensateur lors de l'amplification d'un signal, et peut appliquer de manière interne une tension d'attaque afin d'empêcher une perte de signal due à l'emballage métallique d'un dispositif terminal.
PCT/KR2017/011007 2016-09-29 2017-09-29 Dispositif de capteur capacitif Ceased WO2018062956A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2016-0125621 2016-09-29
KR1020160125621A KR101763589B1 (ko) 2016-09-29 2016-09-29 정전용량방식 센서장치

Publications (1)

Publication Number Publication Date
WO2018062956A1 true WO2018062956A1 (fr) 2018-04-05

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PCT/KR2017/011007 Ceased WO2018062956A1 (fr) 2016-09-29 2017-09-29 Dispositif de capteur capacitif

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KR (1) KR101763589B1 (fr)
WO (1) WO2018062956A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019216274A1 (fr) * 2018-05-08 2019-11-14 株式会社エヌエフ回路設計ブロック Circuit de mesure de capacité, et dispositif de mesure de déplacement de capacité

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102047851B1 (ko) 2018-02-22 2019-11-22 송청담 멀티 채널 정전 터치 센서 회로

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140017002A (ko) * 2009-08-21 2014-02-10 애플 인크. 정전용량 감지를 위한 방법 및 장치
KR20150060565A (ko) * 2013-11-26 2015-06-03 셈테크 코포레이션 근접 검출을 위한 용량성 감지 인터페이스
KR20150077203A (ko) * 2013-12-27 2015-07-07 엘지디스플레이 주식회사 터치 센싱 시스템과 그 구동 방법
KR20150089917A (ko) * 2014-01-27 2015-08-05 삼성전자주식회사 터치 센싱 컨트롤러, 이를 포함하는 터치 센싱 장치 및 터치 센싱 시스템
US20150310248A1 (en) * 2014-03-24 2015-10-29 Fingerprint Cards Ab Capacitive fingerprint sensor with improved sensing element

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140017002A (ko) * 2009-08-21 2014-02-10 애플 인크. 정전용량 감지를 위한 방법 및 장치
KR20150060565A (ko) * 2013-11-26 2015-06-03 셈테크 코포레이션 근접 검출을 위한 용량성 감지 인터페이스
KR20150077203A (ko) * 2013-12-27 2015-07-07 엘지디스플레이 주식회사 터치 센싱 시스템과 그 구동 방법
KR20150089917A (ko) * 2014-01-27 2015-08-05 삼성전자주식회사 터치 센싱 컨트롤러, 이를 포함하는 터치 센싱 장치 및 터치 센싱 시스템
US20150310248A1 (en) * 2014-03-24 2015-10-29 Fingerprint Cards Ab Capacitive fingerprint sensor with improved sensing element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019216274A1 (fr) * 2018-05-08 2019-11-14 株式会社エヌエフ回路設計ブロック Circuit de mesure de capacité, et dispositif de mesure de déplacement de capacité
EP3779476B1 (fr) * 2018-05-08 2022-06-15 Nf Holdings Corporation Circuit de mesure de capacité, et dispositif de mesure de déplacement de capacité
US11428548B2 (en) 2018-05-08 2022-08-30 Nf Holdings Corporation Capacitance measuring circuit and electrostatic capacitive displacement meter

Also Published As

Publication number Publication date
KR101763589B1 (ko) 2017-08-01

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