WO2018027594A1 - Dispositif de détection capacitif et appareil électronique - Google Patents

Dispositif de détection capacitif et appareil électronique Download PDF

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Publication number
WO2018027594A1
WO2018027594A1 PCT/CN2016/094245 CN2016094245W WO2018027594A1 WO 2018027594 A1 WO2018027594 A1 WO 2018027594A1 CN 2016094245 W CN2016094245 W CN 2016094245W WO 2018027594 A1 WO2018027594 A1 WO 2018027594A1
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WIPO (PCT)
Prior art keywords
sensing
control switch
electrode
reference signal
sensing device
Prior art date
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PCT/CN2016/094245
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English (en)
Chinese (zh)
Inventor
李问杰
Original Assignee
深圳信炜科技有限公司
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.)
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Application filed by 深圳信炜科技有限公司 filed Critical 深圳信炜科技有限公司
Priority to CN201680000683.8A priority Critical patent/CN106462308B/zh
Priority to PCT/CN2016/094245 priority patent/WO2018027594A1/fr
Publication of WO2018027594A1 publication Critical patent/WO2018027594A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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

Definitions

  • the present invention relates to the field of sensing technologies, and in particular, to a capacitive sensing device and an electronic device having the capacitive sensing device.
  • the biological information sensing device includes a plurality of sensing electrodes arranged in an array and a driving circuit connected to each sensing electrode.
  • the drive circuit typically drives the sensing electrodes row by row to perform biometric information sensing.
  • the driving circuit performs the biological information sensing every time the partial sensing electrodes are driven, the voltages on the remaining sensing electrodes may be inconsistent due to the influence of signal interference, etc., and thus the sensing of the biological information sensing is performed.
  • the parasitic effects of the electrodes are different and are unknown, and the biological information sensing device requires relatively high sensing accuracy, which is not conducive to accurate detection of biological information.
  • the present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention needs to provide a capacitive sensing device and an electronic device.
  • each sensing unit comprising:
  • a driving circuit is respectively connected to the first control switch and the second control switch of the plurality of sensing units for controlling the first control switch and the second control switch in the same sensing unit to be turned on and off, and is turned on
  • the first control switch transmits an excitation signal to the sensing electrode to perform a sensing operation, and transmits a first reference signal to the sensing electrode through the second control switch that is turned on.
  • the first reference signal is the same as the excitation signal.
  • the driving circuit drives the first control switch of one of the sensing units to be turned on and the second control switch is turned off, driving the first control switch of some or all of the remaining sensing units to be turned off, the second control The switch is turned on.
  • the driving circuit provides the excitation signal to the sensing electrode to perform biometric information sensing through the turned-on first control switch, and receives the sensing signal from the sensing electrode output to perform a self-capacitance sense Test operation.
  • the driving circuit includes a scan driving circuit, a sensing driving circuit, and a reference signal generating circuit, wherein the scan driving circuit is configured to drive the first control switch and the second control switch to be turned on. And a cut-off, the sensing driving circuit is configured to perform a sensing operation by driving the sensing electrode through the turned-on first control switch, the reference signal generating circuit configured to provide the second reference through the turned-on second control switch Signal to the sensing electrode.
  • the sensing driving circuit simultaneously provides the excitation signal through the first control switch that is turned on.
  • a sensing operation is performed on a portion of the sensing electrodes, the reference signal generating circuit further providing the same second reference signal to the sensing electrodes of some or all of the remaining sensing units through the turned-on first control switch.
  • the second reference signal is the same as the first reference signal.
  • the driving circuit simultaneously outputs the excitation signal to each of the sensing electrodes through the data selectors, and respectively outputs the second reference signals to the rest of the same row through the data selectors. Some or all of the sensing electrodes are sensed.
  • the capacitive sensing device further includes a control unit, and the control unit is respectively connected to the scan driving circuit and the plurality of data selectors for controlling the scan driving circuit to drive each row of sensing units And a turn-on timing of the first control switch and the second control switch, and controlling a timing of outputting the excitation signal and the second reference signal to the sensing electrode by controlling the plurality of data selectors.
  • the capacitive sensing device further includes:
  • the scan line group including a first scan line and a second scan line
  • the data line group including a first data line and a second data line;
  • Each scan line group is connected to one row of sensing units, and each data line group is connected to one column of sensing units;
  • the first control switch includes a control electrode, a first transfer electrode, and a second transfer electrode;
  • the second control switch includes a control electrode, a first transfer electrode, and a second transfer electrode;
  • the first scan line connection a scan driving circuit and a control electrode of the first control switch;
  • the second scan line connecting the scan driving circuit and the control electrode of the second control switch;
  • the first data line connecting the data selector And a first transmission electrode of the first control switch;
  • the second data line is connected to the first transmission electrode of the reference signal generation circuit and the second control switch;
  • the second transmission electrode of the first control switch is connected to the sense a measuring electrode;
  • a second transmitting electrode of the second control switch is connected to the sensing electrode.
  • the first data line is used to transmit the excitation signal and the second reference signal
  • the second data line is used to transmit the first reference signal
  • the scan driving circuit passes the a scan line and a second scan line provide a scan enable signal to the first control switch and the second control switch to control the first control switch and the second control switch to be turned on, and are provided by the first scan line and the second scan line
  • the scan cutoff signal is applied to the first control switch and the second control switch to control the first control switch and the second control switch to be turned off.
  • the capacitive sensing device further includes:
  • a first reference signal line connecting the reference signal generating circuit and the second data line, for transmitting the first reference signal
  • sensing signal line connecting the sensing driving circuit and the plurality of data selectors for transmitting the excitation signal to the sensing electrode and transmitting the sensing signal from the sensing electrode to the sensing driving circuit.
  • the capacitive sensing device includes a capacitive sensor, the capacitive sensor includes an insulating substrate, the plurality of sensing units, the plurality of scan line groups, and the plurality of data line groups And the first reference signal line, the plurality of sensing units, the plurality of scan line groups, the plurality of data line groups, and the first reference signal line are formed on the insulating substrate on.
  • the first control switch and the second control switch in each of the sensing units are thin film transistor switches, and the insulating substrate is a glass substrate.
  • the sensing unit includes a first control switch and a second control switch, or the sensing unit includes two first control switches connected in parallel and two second control switches connected in parallel.
  • the insulating substrate includes a first surface and a second surface disposed opposite to the first surface, the first surface is configured to receive a touch or proximity input of the target object, the plurality of sensing units, the A plurality of scan line groups, the plurality of data line groups, and the first reference signal line are disposed on the second surface.
  • the first control switch, the second control switch, the plurality of scan line groups, and the plurality of data line groups are located opposite to the sensing electrodes of the plurality of sensing units One side of the insulating substrate.
  • the sensing electrodes of the plurality of sensing units cover the first control switch, the second control switch, the plurality of scan line groups, and the plurality of data line groups.
  • the capacitive sensor further includes the scan driving circuit, the plurality of data selectors, the second reference signal line, and the sensing signal line, the scan driving circuit, the multiple The data selector, the second reference signal line, and the sensing signal line are formed on the second surface of the insulating substrate.
  • the scan driving circuit, the plurality of data selectors, the second reference signal line, and the sensing signal line are disposed around the plurality of sensing units.
  • the scan driving circuit and the plurality of data selectors each include a control switch, and the control switches are all thin film transistor switches.
  • each data selector comprises a plurality of switch units, each switch unit comprising a first selection switch and a second selection switch, the first selection switch comprising a control electrode, a first transfer electrode, and a second transfer electrode
  • the second selection switch includes a control electrode, a first transmission electrode, and a second transmission electrode, wherein the control electrode of the first selection switch and the control electrode of the second selection switch are respectively connected to the control unit, a first transmission electrode of the first selection switch is connected to the sensing driving circuit, a first transmission electrode of the second selection switch is connected to the reference signal generating circuit, and a second transmission electrode of the first selection switch And connected to the second transmission electrode of the second selection switch and connected to the first data line.
  • control unit controls the first selection switch and the second selection switch of the same switching unit to be turned on in time.
  • the capacitive sensing device further includes a control chip, the control chip including the control unit, the reference signal generating circuit, and the sensing driving circuit.
  • the capacitive sensor and the control chip are respectively dies, and the control chip is bound on the insulating substrate; or the control chip is disposed on a flexible circuit board, A flexible circuit board is electrically coupled to the capacitive sensor.
  • the driving circuit further includes a modulation circuit, configured to uniformly modulate a signal output by the driving circuit to the plurality of sensing units to improve a signal to noise ratio of the sensing signal.
  • a modulation circuit configured to uniformly modulate a signal output by the driving circuit to the plurality of sensing units to improve a signal to noise ratio of the sensing signal.
  • the sensing unit of the capacitive sensing device of the present invention further includes a first control switch and a second control switch
  • the driving circuit can be turned on and off by controlling the first control switch and the second control switch.
  • To perform a sensing operation by driving the sensing electrode through the turned-on first control switch, further providing a first reference signal to the sensing electrode through the turned-on second control switch, thereby applying the first reference signal
  • the parasitic influence of the sensing electrode pair on performing the sensing electrode is known. Accordingly, the driving circuit can eliminate the known parasitic influence in the process of acquiring the biological information, thereby improving the precision of the sensing operation.
  • the capacitive sensing device provides a second reference signal to the sensing of part or all of the remaining sensing electrodes of the same row when a part of the sensing electrodes in each row of sensing electrodes are driven to perform a sensing operation.
  • the electrode such as the pair of sensing electrodes to which the second reference signal is applied, is known to have a parasitic effect on the sensing electrode that is sensed, and accordingly, the driving circuit can eliminate the known parasitic in the process of acquiring biological information. Influence, thereby improving the accuracy of the sensing operation.
  • the invention further provides an electronic device comprising the capacitive sensing device of any of the above.
  • the electronic device includes the capacitive sensing device, the user experience of the electronic device is high.
  • FIG. 1 is a schematic diagram showing the circuit structure of an embodiment of a biological information sensing apparatus according to the present invention.
  • Fig. 2 is a plan view showing a part of the structure of the biological information sensing device shown in Fig. 1.
  • FIG. 3 is a circuit diagram showing an embodiment of a data selection circuit of the biometric information sensing device shown in FIG. 1.
  • FIG. 4 is a schematic structural view of another embodiment of a biological information sensing device of the present invention.
  • FIG. 5 is a partial cross-sectional structural view of the biological information sensing device shown in FIG. 4.
  • FIG. 5 is a partial cross-sectional structural view of the biological information sensing device shown in FIG. 4.
  • Fig. 6 is a view showing a state of use of the biometric information sensing device shown in Fig. 4.
  • FIG. 7 is a flow chart showing a method of fabricating an embodiment of the biometric information sensor shown in FIG.
  • FIG. 8 is a flow chart of a method of making a first control switch and a second control switch.
  • FIG. 9 is a partial structural schematic view of still another embodiment of the biological information sensing device of the present invention.
  • Figure 10 is a plan view showing another embodiment of the sensing unit of the biological information sensing device of the present invention.
  • FIG. 12 is a schematic structural view of an embodiment of an electronic device according to the present invention.
  • FIG. 13 is a block diagram showing the circuit configuration of an embodiment of the electronic device shown in FIG.
  • a plurality includes two or more, and “a plurality of” includes two or more, unless the invention clearly dictates otherwise.
  • “At least two columns” includes various suitable situations in which two columns, three columns, four columns, and five columns are gradually increasing.
  • first and “second” appearing in each component name and signal name are not intended to limit the order in which the components or signals appear, but to facilitate the component and signal naming, to clearly distinguish the components and the signals. Make the description more concise.
  • the capacitive sensing device provided by the present invention is suitable for use in a biological information sensing device, particularly a fingerprint sensing device.
  • the present invention is not limited thereto, and the capacitive sensing device is also applicable to other suitable types of sensing devices, such as touch sensing devices and the like.
  • the biometric information sensing device is configured to sense predetermined biological information of a target object.
  • the target object such as a user's finger, may also be other parts of the user's body, such as the palms, toes, ears, etc., or even other suitable types of objects, and is not limited.
  • the predetermined biological information is, for example, a fingerprint, a palm print, an ear print, or the like.
  • FIG. 1 is a schematic structural diagram of a circuit of an embodiment of a biological information sensing device according to the present invention.
  • Fig. 2 is a plan view showing a part of the structure of the biological information sensing device shown in Fig. 1.
  • the biometric information sensing device 1 includes a plurality of sensing electrodes 111 and a driving circuit 20.
  • the driving circuit 20 is connected to the plurality of sensing electrodes 111 for driving the plurality of sensing electrodes 111 to perform biometric information sensing.
  • capacitive sensing devices include mutual capacitive sensing devices and self-capacitive sensing devices.
  • the biometric information sensing device 1 may be a self-capacitance biological information sensing device or a mutual capacitance biological information sensing device, depending on the cooperation relationship between the driving circuit 20 and the sensing electrode 111.
  • the mutual capacitance type biometric information sensing device may include a plurality of driving electrodes and a plurality of sensing electrodes. A mutual capacitance is formed between each of the driving electrodes and a sensing electrode.
  • the drive circuit provides an excitation signal to the drive electrode and receives a sensed signal from the sense electrode output.
  • the amount of charge formed between the driving electrode and the sensing electrode may change correspondingly, so that the sensing electrode outputs a corresponding sensing signal to Drive the circuit to obtain relevant biological information.
  • the self-capacitance bioinformation sensing device includes a plurality of sensing electrodes. Each sense electrode can form a capacitance to ground. At the time of sensing, the drive circuit provides an excitation signal to the sensing electrode and receives a sensing signal from the sensing electrode output. When the target object approaches or touches the biometric information sensing device, a capacitance is formed between the target object and the sensing electrode, causing a change in the amount of charge on the sensing electrode, so that the sensing electrode outputs a corresponding sensing signal to the driving. Circuits to obtain relevant biological information.
  • the biological information sensing device 1 is, for example, a self-capacitance sensing device.
  • the plurality of sensing electrodes 111 are arranged in a plurality of rows and columns. However, in other embodiments, the plurality of sensing electrodes 111 may also be arranged in other regular or irregular manners.
  • a first reference signal is provided to some or all of the remaining sensing electrodes 111. Electrode 111.
  • the driving circuit 20 provides the first reference signal to all the remaining sensing electrodes 111.
  • the driving circuit 20 supplies the excitation signal to one of the sensing electrodes 111 of each column
  • the first reference signal is supplied to the remaining part or all of the sensing electrodes 111, thereby applying
  • the sensing electrode 111 of the first reference signal is known to have a parasitic effect on the sensing electrode 111 that performs biometric sensing, so that the driving circuit 20 can cancel out subsequent calculations of the biological information.
  • the known parasitic effects further improve the sensing accuracy of the biological information.
  • the first reference signal is for example a constant voltage signal.
  • the voltage difference between the first reference signal and the excitation signal remains unchanged, for example, the first reference signal is the same as the excitation signal, thereby reducing the remaining sensing electrodes 111 and performing biological information
  • the sensed charge and discharge power of the parasitic capacitance between the sensing electrodes 111 further improves the sensing accuracy of the biological information.
  • the drive circuit 20 drives the sensing electrode 111 row by row to perform biometric information sensing.
  • the driving circuit 20 can simultaneously drive the plurality of rows of sensing electrodes 111 to perform biometric information sensing at a time.
  • the driving circuit 20 simultaneously provides the excitation signal to the partial sensing electrode 111 to perform biological information sensing, and provides a second reference signal to the rest. Some or all of the sensing electrodes 111 are sensed. Preferably, the second reference signal is provided to all remaining sensing electrodes 111.
  • the driving circuit 20 performs biometric information sensing on the partial sensing electrodes 111 by simultaneously supplying the excitation signals a plurality of times, thereby driving the one row of sensing electrodes 111 to perform biometric information sensing.
  • a time-division driving method for one row of sensing electrodes 111 is employed, thereby reducing the number of pins on the chip, which will be described later.
  • the driving circuit 20 can simultaneously drive the sensing electrodes 111 of one row to perform biometric information sensing.
  • the plurality of sensing electrodes 111 are formed in a display screen.
  • the driving circuit 111 is also capable of simultaneously driving one row of sensing electrodes 111 to perform biometric information sensing.
  • the driving circuit 20 provides the excitation signal to the partial sensing electrodes 111 in each row of sensing electrodes 111, the second reference signals are provided to some or all of the remaining sensing electrodes 111. 111, whereby the sensing electrode 111 to which the second reference signal is applied is known to the parasitic influence of the sensing electrode 111 performing the biological information sensing, whereby the driving circuit 20 performs subsequent calculation of the biological information. It can offset the known parasitic effects and improve the sensing accuracy of biological information.
  • the second reference signal is for example a constant voltage signal.
  • the voltage difference between the second reference signal and the excitation signal remains unchanged, for example, the second reference signal is the same as the excitation signal, thereby reducing the remaining sensing electrodes 111 and performing biological information
  • the sensed charge and discharge power of the parasitic capacitance between the sensing electrodes 111 further improves the sensing accuracy of the biological information.
  • the biometric information sensing device 1 includes a plurality of sensing units 11.
  • Each sensing unit 11 includes a sensing electrode 111, a first control switch 113, and a second control switch 115.
  • the first control switch 113 and the second control switch 115 are both connected to the sensing electrode 111.
  • the drive circuit 20 includes a scan drive circuit 21, a sense drive circuit 22, and a reference signal generation circuit 23.
  • the scan driving circuit 21 is respectively connected to the first control switch 113 and the second control switch 115 of the plurality of sensing units 11 for driving the first control switch 113 and the second in each sensing unit 11
  • the control switch 115 is turned on in time.
  • the sensing driving circuit 22 is connected to the sensing electrode 111 through a first control switch 113 in each sensing unit 11 for providing the excitation signal to the sensing electrode 111 by the turned-on first control switch 113.
  • Information sensing is connected to the sensing electrode 111 through a second control switch 115 in each sensing unit 11 for providing the first reference signal to the sensing through the turned-on second control switch 115. Electrode 111.
  • the scan driving circuit 21 drives the first control switch 113 in a sensing unit 11 to be turned on, and the second control switch 115 is turned off, driving the remaining portions of the sensing unit 11 or
  • the first control switch 113 of all the sensing units 11 is turned off, the second control switch 115 is turned on, and the reference signal generating circuit 23 supplies the first reference signal to the sensing electrodes 111 through the turned-on second control switch 115.
  • the sensing driving circuit 22 provides the excitation signal to the sensing electrode 111 to perform biometric information sensing through the turned-on first control switch 113, and receives the sensing signal output from the sensing electrode 111 to acquire biometric information.
  • the sensing driving circuit 22 passes the first control switch 113 that is turned on at the same time.
  • the reference signal generating circuit 23 providing the second reference signal to a portion of the remaining sensing unit 11 through the turned-on first control switch 113 or All of the sensing electrodes 111 of the sensing unit 11.
  • the drive circuit 20 may further include a data selection circuit 24 that is connected to the sense drive circuit 22 and the reference signal generation circuit 23, respectively.
  • the data selection circuit 24 is further connected to a first control switch 113 in each of the sensing units 11. For each sensing unit 11, the data selection circuit 24 selects whether to output the second reference signal provided by the reference signal generating circuit 23 or output the excitation signal provided by the sensing driving circuit 22 to the sensing electrode. 111.
  • the data selection circuit 24 outputs the excitation signal to a sensing electrode 111, the sensing signal sensed by the sensing electrode 111 is further output to the driving circuit 20.
  • the drive circuit 20 is provided with the data selection circuit 24, it is possible to perform time-division biometric sensing on the sensing electrodes 111 of each row.
  • the data selection circuit 24 includes a plurality of data selectors (Multiplexer) 241.
  • Each of the data selectors 241 is connected to the partial sensing unit 11, and is further connected to the reference signal generating circuit 23 and the sensing driving circuit 22, respectively.
  • the plurality of data selectors 241 are configured to selectively output the excitation signal or the second reference signal to the sensing electrode 111.
  • each data selector 241 is coupled to at least two columns of sensing units 11.
  • the driving circuit 20 outputs the excitation signal to the sensing electrode 111 to perform biometric information sensing by using the data selector 241, and outputs the second reference signal to the same row through each data selector 241. Some or all of the remaining sensing electrodes 111 sense the electrodes 111.
  • the driving circuit 20 drives the row of sensing electrodes 111 to perform biometric information sensing by sequentially outputting the excitation signals to the sensing electrodes 111 through the data selectors 241 and the first control switches 113 that are turned on.
  • the data selection circuit 24 may be other suitable circuit configurations and is not limited to the plurality of data selectors 241 described herein.
  • the driving circuit 20 simultaneously supplies the excitation signal to the sensing electrodes 111 of each row, the data selection circuit 24 may also be omitted.
  • the drive circuit 20 can further include a control unit 30.
  • the control unit 30 is connected to the scan driving circuit 21 and the plurality of data selectors 241, respectively, for controlling the scan driving circuit 21 to drive the first control switch 113 and the second control in each row sensing unit 11.
  • control unit 30 controls the scan driving circuit 21 to turn on the first control switch 113 row by row, and control a part of the remaining rows or when the first control switch 113 of each row sensing unit 11 is turned on.
  • the second control switch 115 of the sensing unit 11 of all rows is turned on.
  • the control unit 30 controls the scan driving circuit 21 to turn on the first control switch 113 and the second control switch 115 in a time-sharing manner.
  • the control unit 30 controls the data selector 241 to time-output the excitation signal to the respective sensing units 11 connected to the data selector 241.
  • the biometric information sensing device 1 further includes, for example, a plurality of scan line groups B and a plurality of data line groups D.
  • Each scan line group B is connected to a row of sensing units 11, and each data line group D is connected to a column of sensing units 11.
  • each scan line group B includes a first scan line B1 and a second scan line B2.
  • Each data line group D includes a first data line D1 and a second data line D2.
  • the first control switch 113 includes a control electrode G1, a first transfer electrode S11, and a second transfer electrode S12.
  • the second control switch 115 includes a control electrode G2, a first transmission electrode S21, and a second The electrode S22 is transferred.
  • the first scan line B1 is connected to the scan driving circuit 21 and the control electrode G1 of the first control switch 113.
  • the second scan line B2 is connected to the scan driving circuit 21 and the control electrode G2 of the second control switch 115.
  • the first data line D1 is connected to the data selector 241 and the first transfer electrode S11 of the first control switch 113.
  • the second data line D2 is connected to the first transmission electrode S21 of the reference signal generating circuit 23 and the second control switch 115.
  • the second transfer electrode S12 of the first control switch 113 is connected to the sensing electrode 111.
  • the second transfer electrode S22 of the second control switch 115 is connected to the sensing electrode 111.
  • the first data line D1 is for transmitting the excitation signal and the second reference signal
  • the second data line D2 is for transmitting the first reference signal
  • the scan driving circuit 21 passes the first
  • the scan line B1 and the second scan line B2 provide a scan enable signal to the first control switch 113 and the second control switch 115 to control the first control switch 113 and the second control switch 115 to be turned on, through the first scan line B1.
  • the second scan line B2 provides a scan cutoff signal to the first control switch 113 and the second control switch 115 to control the first control switch 113 and the second control switch 115 to be turned off.
  • the first scan line B1 and the second scan line B2 both extend in the row direction and are arranged in the column direction.
  • the first data line D1 and the second data line D2 both extend in the column direction and are arranged in the row direction.
  • the biometric information sensing device 1 further includes, for example, a first reference signal line R1, a second reference signal line R2, and a sensing signal line L.
  • the first reference signal line R1 is connected to the reference signal generating circuit 23 and the second data line D2 for transmitting the first reference signal.
  • the second reference signal line R2 is connected to the reference signal generating circuit 23 and the plurality of data selectors 241 for transmitting the second reference signal.
  • the sensing signal line L is connected to the sensing driving circuit 22 and the plurality of data selectors 241 for transmitting the excitation signal to the sensing electrode 111 and transmitting the sensing signal from the sensing electrode 11 to the sense The drive circuit 22 is measured.
  • the first reference signal line R1, the second reference signal line R2, and the sensing signal line L extend mainly in the row direction.
  • FIG. 3 is a schematic diagram showing the circuit structure of an embodiment of the data selector 241 shown in FIG.
  • the data selector 241 includes eight switch units 243, each of which includes a first selection switch S1 and a second selection switch S2.
  • the first selection switch S1 includes a control electrode G3, a first transfer electrode S31, and a second transfer electrode S32.
  • the second selection switch S2 includes a control electrode G4, a first transfer electrode S41, and a second transfer electrode S42.
  • the control unit 30 is connected to the control electrode G3 and the control electrode G4 in each of the switching units 243, respectively.
  • the first transfer electrode S31 is connected to the sensing drive circuit 22.
  • the first transfer electrode S41 is connected to the reference signal generating circuit 23.
  • the second transfer electrode S32 and the second transfer electrode S42 in each of the switching units 243 are connected and connected to the first transfer electrode S11 of the first control switch 113.
  • the control unit 30 controls the first selection switch S1 and the second selection switch S2 to be turned on, that is, when the first selection switch S1 is turned on, the second selection switch S2 is turned off.
  • the first selection switch S1 is turned off.
  • the control unit 30 controls the first selection switch S1 of a switching unit 243 to be turned on and the second selection switch S2 to be turned off, the first selection switch S1 of the remaining switching units 243 is controlled to be turned off, The second selection switch S2 is turned on.
  • the sensing drive circuit 22 supplies the excitation signal to the sensing electrode 111 of the sensing unit 11 that is turned on by the first control switch 113 through the first selection switch S1 that is turned on; the second selection switch S2 that is turned on
  • the reference signal generating circuit 23 supplies the second reference signal to the sensing electrode 111 of the sensing unit 11 that is turned on by the second control switch 115.
  • the number of the plurality of data selectors 241 is, for example, sixteen, and each of the data selectors 241 includes eight switching units 243.
  • the number of sensing electrodes 111 in the same row is 128.
  • FIG. 1 only shows that each data selector 241 is respectively connected to the two columns of sensing units 11, if the data selector 241 shown in FIG. Corresponding to the structure, FIG. 1 actually omits the structure in which each data selector 241 is also connected to the other six columns of sensing units 11. Further, the configuration of FIG. 4 to be described later corresponds to the configuration shown in FIG. 1, and the configuration in which each of the data selectors 241 is further connected to the other six columns of sensing units 11 is also omitted, and the description will be made here.
  • the biometric information sensing device 1 as a fingerprint sensing device as an example, when the finger of the user approaches or touches the sensing electrode 111 of the plurality of sensing units 11, the distance between the ridge and the valley and the sensing electrode 111 is Differently, therefore, the capacitances respectively formed by the ridges, valleys and the sensing electrodes 111 are different, so that the influence on the amount of charge on the sensing electrodes 111 is different, so that the driving circuit 20 can output the sensing signals according to the sensing electrodes 111. The corresponding fingerprint information can be obtained.
  • the working principle of an embodiment of the biological information sensing device 1 is as follows.
  • the control unit 30 controls the first selection switch S1 of one of the switch units 243 of each of the data selectors 241 to be turned on, the second selection switch S2 to be turned off, and controls the first of the remaining switch units 243 of the respective data selectors 241.
  • the selection switch S1 is turned off, and the second selection switch S2 is turned on.
  • the sensing driving circuit 22 supplies the excitation signal to the first data line D1 through the first selection switch S1 turned on in each of the data selectors 241.
  • the reference signal generating circuit 23 supplies the second reference signal to the first data line D1 through the second selection switch S2 that is turned on in each of the data selectors 241.
  • the first selection switch of each of the switching units 243 in each of the data selectors 241 is controlled by the control unit 30 multiple times. S1 is turned on in time.
  • the control unit 30 controls the scan driving circuit 21 to drive the first control switch 113 to be turned on, the second control switch 115 is turned off, and the first control switch 113 that controls each row is turned on, and the second control switch 115 is turned off. At the same time, the first control switch 113 that controls the remaining rows is turned off, and the second control switch 115 is turned on. Accordingly, the excitation signal on the first data line D1 is output to the sensing electrode through the turned-on first control switch 113.
  • the reference signal generating circuit 23 supplies the first reference signal to the sensing electrode 111 through the turned-on second control switch 115.
  • the biometric information of the biometric information sensing device 1 is improved by providing the first reference signal and the second reference signal to the remaining corresponding sensing electrodes 111 when performing the biometric information sensing on each of the driving portion sensing electrodes 111. Sensing accuracy.
  • FIG. 4 is a schematic structural diagram of another embodiment of the biological information sensing device of the present invention.
  • FIG. 5 is a partial cross-sectional structural view of the biological information sensing device shown in FIG. 4.
  • FIG. Fig. 6 is a view showing a state of use of the biological information sensing device of Fig. 4;
  • the biological information sensing device 1 includes a biological information sensor 2.
  • the biometric information sensor 2 includes an insulating substrate 2a, the plurality of sensing units 11, the plurality of scanning line groups B, the plurality of data line groups D, and the first reference signal line R1.
  • the plurality of sensing units 11, the plurality of scanning line groups B, the plurality of data line groups D, and the first reference signal lines R1 are formed on the insulating substrate 2a.
  • the first control switch 113 and the second control switch 115 in each of the sensing units 11 are, for example, thin film transistor (TFT) switches, and the insulating substrate 2a is, for example, a glass substrate.
  • TFT thin film transistor
  • the biometric information sensor 2 is fabricated by a process of forming a TFT switch on a glass substrate, thereby reducing the manufacturing cost of the biometric information sensor 2 and the bioinformation sensor 2.
  • the control electrodes G1 and G2 are gates
  • the first transmission electrodes S11 and S21 are sources
  • the second transmission electrode is S12 and S22 are drains.
  • the present invention does not limit the insulating substrate 2a to a glass substrate, and may be other suitable types of insulating substrates.
  • the first control switch 113 and the second control switch 115 are not limited to thin film transistors. The switch can also be other suitable types of switches.
  • the thin film transistor switch is, for example, a suitable type of thin film transistor switch such as a low temperature polysilicon (LTPS) thin film transistor switch, an indium gallium zinc oxide (IGZO) thin film transistor switch, an amorphous silicon thin film transistor switch, or the like.
  • LTPS low temperature polysilicon
  • IGZO indium gallium zinc oxide
  • amorphous silicon thin film transistor switch or the like.
  • the thin film transistor switch is a low temperature polysilicon thin film transistor switch.
  • the insulating substrate 2a includes a first surface A1 and a second surface disposed opposite to the first surface A1 A2, the first surface A1 is configured to receive a touch or proximity input of a target object, the plurality of sensing units 11, the plurality of scan line groups B, the plurality of data line groups D, and The first reference signal line R1 is disposed on the second surface A2.
  • the sensing electrodes 111 of the plurality of sensing units 11 are compared to the first control switch 113, the second control switch 113, the plurality of scan line groups B, and the plurality of data line groups Group D is closer to the second surface A2.
  • the first control switch 113, the second control switch 115, the plurality of scan line groups B, and the plurality of data line groups D are located at the sensing electrodes 111 of the plurality of sensing units 11 The side facing away from the insulating substrate 2a.
  • the sensing electrodes 111 of the plurality of sensing units 11 cover the first control switch 113, the second control switch 115, the plurality of scan line groups B, and the plurality of data Line group D.
  • the biometric information sensor 1 further includes a passivation layer 16 disposed on the plurality of sensing units 11, the plurality of scan line groups B, the plurality of data line groups D, And the first reference signal line R1.
  • the passivation layer 16 is used to planarize the surface of the biometric information sensor 2 and to protect components such as the plurality of sensing units 11 .
  • FIG. 7 is a flowchart of a method for fabricating an embodiment of the biometric information sensor 2.
  • the method of manufacturing the biometric information sensor 2 is as follows.
  • the insulating substrate 2a is, for example, a glass substrate.
  • the sensing electrode 111 is made of, for example, a metal material. However, the sensing electrode 111 may also be made of other suitable conductive materials. For example, the sensing electrode 111 may also be made of a transparent conductive material, such as indium oxide. Tin, indium zinc oxide, and the like. In addition, the sensing electrode may also be made of an alloy material such as molybdenum, lithium or molybdenum.
  • the first insulating layer 12 is made of, for example, a material such as silicon oxide or silicon nitride.
  • F4 forming a first control switch 113 and a second control switch 115 on the first insulating layer 12, and forming a through hole H penetrating through the sensing electrode 111 on the first insulating layer 12, through the through hole a hole H, a first control switch 113 and a second control switch 115 are connected to the sensing electrode 111;
  • the first control switch 113 and the second control switch 115 of each sensing unit 11 are formed above the sensing electrodes 111 and are respectively connected to the sensing electrodes 111 through the through holes H.
  • F5 forming a passivation layer 16 on the first control switch 113 and the second control switch 115.
  • the biometric information sensor 2 is completed. It should be noted that, in the above-described manufacturing method, the steps of forming the plurality of scanning line groups B, the plurality of data line groups D, and the first reference signal line R1 are omitted.
  • the manufacturing process of the biometric information sensor 2 formed according to the above manufacturing method is simple, it is not necessary to additionally provide a protective cover or a coating layer (Coating layer), thereby saving manufacturing costs.
  • the biometric information sensor 2 may be formed by forming a first control switch 113 and a second control switch 115 of each sensing unit 11 on the insulating substrate 2a. Forming a first insulating layer 12 on the first control switch 113 and the second control switch 115, and forming a second transfer electrode and a second control switch 115 penetrating the first control switch 113 on the first insulating layer 12 a through hole H of the second transfer electrode S22, and then forming the first control switch 113 connecting the sensing units 11 and the sensing electrode 111 on the second control switch 115 on the first insulating layer 12. Next, a protective cover is provided on the sensing electrode 111 or a coating layer (Coating layer) is formed. This is also possible. It should be noted that the description of the steps of the plurality of scan line groups B, the plurality of data line groups D, and the first reference signal line R1 is also omitted herein.
  • FIG. 8 is a flowchart of a method for fabricating the first control switch 113 and the second control switch 115.
  • the first control switch 113 and the second control switch 115 as amorphous silicon thin film transistors as an example, a method of manufacturing the first control switch 113 and the second control switch 115 in the process of fabricating the biological information sensor 2 will be described below.
  • the second insulating layer 13 is made of, for example, a material such as silicon oxide or silicon nitride.
  • the active layers 14, 15 are amorphous silicon layers.
  • step F4 and step F5 may be combined and implemented in the same step, but may be formed in two different steps.
  • F45 forming a first transfer electrode S11 and a second transfer electrode S12 of the first control switch 113, forming a first transfer electrode S21 and a second transfer electrode S22 of the second control switch 115 on the second insulating layer 13, and The second transfer electrode S12 and the second transfer electrode S22 are filled with the through holes H to be connected to the sensing electrodes 111, respectively.
  • the first transfer electrode S11 and the second transfer electrode S12 are located on both sides of the active layer 14
  • the first transfer electrode S21 and the second transfer electrode S22 are located on both sides of the active layer 15, thereby forming the first control switch 113 and the second control switch 115.
  • the second transfer electrode S12 of the first control switch 113 and the second transfer electrode S22 of the second control switch 115 are respectively connected to the sensing electrode 111 through a through hole H.
  • the second transfer electrode S12 of the first control switch 113 and the second transfer electrode S22 of the second control switch 115 in the same sensing unit 11 can pass through the same through hole H and The sensing electrodes 111 are connected.
  • step F5 the second insulating layer 13, the first transfer electrode S11, the active layer 14, the second transfer electrode S12, the first transfer electrode S21, the active layer 15, and the second transfer electrode S22 are formed. Passivation layer 16.
  • the first control switch 113 and the second control switch 115 formed in the above manufacturing method are mainly Bottom-Gate thin film transistors. However, the first control switch 113 and the second control switch 115 may also be top.
  • a top-gate thin film transistor such as a low temperature polysilicon thin film transistor.
  • the plurality of scan line groups B, the plurality of data line groups D, the first reference signal line R1, the first control switch 113, and the second control switch 115 are connected by a connection line.
  • a peripheral wiring (not shown) formed on the second surface A2 of the insulating substrate 2a is connected by a via or the like to perform signals with a corresponding circuit of the aforementioned driving circuit 20 or a control chip 3 to be described later. transmission.
  • the biometric information sensor 2 further includes the scan driving circuit 21, the plurality of data selectors 241, the second reference signal line R2, and the sensing signal line L.
  • the scan driving circuit 21, the plurality of data selectors 241, the second reference signal line R2, and the sensing signal line L are formed on the second surface A2 of the insulating substrate 2a.
  • the scan driving circuit 21, the plurality of data selectors 241, the second reference signal line R2, and the sensing signal line L are disposed around the plurality of sensing units 11.
  • the first selection switch S1 and the second selection switch S2 of the data selector 241 are also, for example, thin film transistor switches.
  • the scan driving circuit 21 generally includes a plurality of control switches (not shown), and the plurality of control switches are, for example, thin film transistor switches.
  • the plurality of data selectors 241 and the scan driving circuit 21 are formed by the same or similar manufacturing process when the first control switch 113 and the second control switch 115 are formed, thereby improving The integration of the biometric sensor 2 and the reduction in manufacturing costs.
  • the biometric information sensing device 1 includes a control chip 3 including the control unit 30, the reference signal generating circuit 23, and the sensing driving circuit 22. That is, a part of the above-mentioned driving circuit 20 is formed in the control chip 3, and a part is formed in the raw The object information sensor 2 is provided such that the integration degree of the biological information sensing device 1 is increased, the volume of the biological information sensing device 1 is reduced, and the manufacturing cost of the biological information sensing device 1 can be reduced.
  • the biometric information sensor 2 and the control chip 3 are respectively, for example, a die, and the control chip 3 is disposed on the insulating substrate 2a, for example, by a flip chip process.
  • the control chip 3 is bonded to the glass substrate by, for example, a chip on glass (COG).
  • COG chip on glass
  • the control chip 3 is bonded to the film substrate by, for example, Chip On Film (COF).
  • COG Chip On Film
  • COF Chip On Film
  • the control chip 3 may also be formed on the insulating substrate 2a by other suitable processes, and is not limited to the flip chip process described herein.
  • control chip 3 After the control chip 3 is disposed on the insulating substrate 2a of the biometric information sensor, the control chip 3 and the biometric information sensor 1 are placed in a mold, and a package is formed by a molding process. Not shown) on the biometric information sensor 2 and the control chip 3, thereby forming a chip.
  • the package is made of, for example, an epoxy resin material, but is not limited to the epoxy resin material, and may be other suitable materials.
  • the first surface A1 of the insulating substrate 2a is used to receive a proximity or touch input of a target object, or when a user senses a living being using the biometric information sensing device 1 In the information, the first surface A1 is closer to the target object than the second surface A2.
  • the scan driving circuit 21, the data selection circuit 24, the second reference signal line R2, and the sensing signal line L may not be disposed on the insulating substrate 2a.
  • the scan driving circuit 21 and the data selection circuit 24 may be disposed in the control chip 3, or may be disposed in another chip, or may exist in a circuit other than the chip.
  • FIG. 9 is a schematic structural diagram of still another embodiment of the biological information sensing apparatus of the present invention.
  • the biometric information sensing device 1 further includes a connector 4 for connecting the control chip 3 and the biometric information sensor 2.
  • the connecting member 4 is, for example, a Flexible Printed Circuit Board (FPCB).
  • the control chip 3 is disposed, for example, on the flexible circuit board 4, and is connected to the biometric information sensor 2 via the flexible circuit board 4. Signal transmission is performed between the biometric information sensor 2 and the control chip 3 via the flexible circuit board 4.
  • FPCB Flexible Printed Circuit Board
  • the biometric information sensor 2 and the control chip 3 may also be a chip, or the biometric information sensor 2 is a die, the control chip 3 is a chip, or The biometric information sensor 2 and the control chip 3 are both dies.
  • the data selection circuit 24 is provided to control the time-division output excitation signals to the sensing electrodes 111 of the same row.
  • Each of the data selectors 241 of the data selection circuit 24 is respectively provided with a port (not shown) connected to the sensing driving circuit 22, and the port is used for transmitting an excitation signal or a sensing signal, and correspondingly
  • a bio-information sensor 2 is provided with a connection pin (not shown) corresponding to each port for connecting the port and the sensing drive circuit 22. In this way, the number of connection pins between the biometric information sensor 2 and the control chip 3 can be reduced.
  • the biometric information sensor 2 may be formed in a display screen or on a display screen instead of being integrated into a die or a chip.
  • the control chip 3 can simultaneously drive one row of sensing electrodes 111 to perform biometric information sensing.
  • FIG. 10 is a schematic structural diagram of another embodiment of a sensing unit according to the present invention.
  • the sensing unit 11 includes two first control switches 113 connected in parallel and two second control switches 115 connected in parallel.
  • FIG. 11 is a schematic structural diagram of still another embodiment of the biological information sensing apparatus of the present invention.
  • the driving circuit 20 and each of the sensing electrodes 111 are respectively connected by a single data line L1, and the first control switch 113 and the second control switch 115 are omitted. Accordingly, it is also feasible for the drive circuit 20 to output respective signals to the respective sensing electrodes 111.
  • FIG. 12 is a schematic structural diagram of an embodiment of an electronic device according to the present invention.
  • the electronic device 9 includes the biological information sensing device 1 according to any of the above embodiments.
  • the electronic device 9 is, for example, a portable electronic product, a home-based electronic product, or an in-vehicle electronic product.
  • the electronic device is not limited to the electronic products listed herein, but may be other suitable types of electronic products.
  • the portable electronic product is, for example, a mobile terminal, and the mobile terminal is, for example, a mobile terminal, a tablet computer, a notebook computer, a wearable product, or the like.
  • the home-based electronic product is, for example, a smart home door lock, a television, a refrigerator, a desktop computer, and the like.
  • the in-vehicle electronic products are, for example, suitable in-vehicle electronic products such as an in-vehicle display, a driving recorder, a navigator, and a car refrigerator.
  • the biological information sensing device 1 is disposed at any suitable position, such as the front side, the side surface, and the back side of the mobile phone, and the biometric information sensing device 1 can be configured as The outer casing of the mobile phone can also be placed inside the mobile phone.
  • the biometric information sensing device 1 is disposed on the front side of the mobile phone.
  • the electronic device 9 Based on the biological information sensed by the biometric information sensing device 1, the electronic device 9 performs, for example, user identity authentication, online payment, a quick launch application (APP), and the like.
  • APP quick launch application
  • the electronic device 9 includes the biological information sensing device 1, the sensing accuracy of the biological information sensing device 1 is high, and therefore, the user experience of the electronic device 9 is good.
  • the electronic device 9 further comprises a master chip 5.
  • the main control chip 5 is connected to the biometric information sensing device 1 for data communication with the biometric information sensing device 1.
  • the master chip 5 is, for example, a single chip or a chipset.
  • the chipset includes an application processor (AP) and a power chip. Additionally, the chipset may further include a memory chip.
  • the master chip 5 is a single chip, the master chip 5 is, for example, an application processor. Further, the application processor may also be replaced by a central processing unit (CPU).
  • CPU central processing unit
  • the main control chip 5 includes a ground terminal 50 connected to the device ground and receiving a ground signal of the device ground.
  • the ground signal is indicated by GND in FIG.
  • the device is also called system ground, for example, the negative pole of the power supply of the electronic device 9, and the power supply is a battery.
  • the ground signal GND is also referred to as a system ground voltage, a system ground signal, a device ground voltage, or a device ground signal.
  • the ground signal GND is a constant voltage.
  • the ground signal GND is, for example, a voltage signal such as 0V (volt), 2V, (-1)V.
  • the device is not earthy or absolutely earthy. However, when the electronic device 9 is connected to the earth through a conductor, the device ground may also be the earth's earth.
  • the biometric information sensing device 1 may be based on a domain as a voltage reference.
  • the domain is a domain based on the ground signal GND.
  • the ground signal GND serves as a voltage reference reference for each circuit in the biological information sensing device 1.
  • the present invention further proposes a technical aim of improving the signal to noise ratio by using a modulation technical scheme, which is applicable to the living organisms described in the above embodiments.
  • Information sensing device 1 1.
  • the signal output to the sensing unit 11 is uniformly modulated by a modulation scheme.
  • the modulation signal MGND is used for uniformly modulating a signal output by the driving circuit 20 to the sensing unit 11, for example, the first reference signal, the second reference signal, the excitation signal, and the scanning The turn-on signal, and the scan cutoff signal.
  • the ground for example, the second ground terminal 32
  • loads the modulation signal MGND is a modulation ground.
  • the excitation signal includes a first voltage signal and a second voltage signal.
  • the excitation signal is a square wave pulse signal in which the first voltage signal and the second voltage signal alternate.
  • the first voltage signal is lower than the second voltage signal, and the first voltage signal is, for example, a ground signal GND.
  • Modulation letter The number MGND is used to raise the second voltage signal to improve the signal to noise ratio of the sensing signal.
  • the driving circuit 20 When the driving circuit 20 receives the sensing signal from the sensing electrode 111, the sensing signal needs to be inversely modulated to acquire corresponding biological information.
  • the biometric information sensing device 1 uses two domains as a voltage reference.
  • the two fields are shown as a domain 60 referenced to the ground signal GND and a domain 70 referenced to the modulation signal MGND.
  • the ground terminal of the circuit in the domain 60 with reference to the ground signal GND is directly connected to the device ground, and the ground of the circuit in the domain 70 with reference to the modulation signal MGND is directly connected to the modulation ground.
  • the reference ground potential is a modulation signal MGND loaded by the modulation ground; and for the circuit grounded by the device ground, the reference ground potential is the ground signal GND loaded by the device ground.
  • control unit 30, the scan driving circuit 21, the data selection circuit 24, the reference signal generating circuit 23, and the sensing unit 11 are disposed, for example, in the field 70.
  • the sensing drive circuit 22 is, for example, partially located in the domain 60 and partially located in the domain 70.
  • the main control chip 5, the modulation circuit 33, and the voltage generating circuit 34 are located in the domain 60.
  • the present invention is not limited to the division of the above-mentioned circuits in the domains 60 and 70.
  • the manufacturer may perform different adjustments according to actual needs, for example, circuit conditions.
  • the biometric information sensing device 1 may further include a ground line G disposed around the plurality of sensing units 11, and in some embodiments, the grounding line G is in a grid shape,
  • the sensing electrodes 111 are located in the same layer and are disposed around the sensing electrodes 111, respectively.
  • the ground line G may be provided with a turn or the like on the periphery of the plurality of sensing units 11.
  • the biometric information sensing device 1 when the biometric information sensing device 1 is a domain with a domain as a voltage reference reference and the domain is based on the ground signal GND, the first reference signal and/or the second reference signal, for example It is a constant voltage signal with respect to the ground signal GND.
  • the biometric information sensing device 1 when the biometric information sensing device 1 is based on two domains 60 and 70 as a voltage reference, the first reference signal and/or the second reference signal is changed, for example, relative to the ground signal GND.
  • the voltage signal is a constant voltage signal with respect to the modulation signal MGND.
  • the power supply voltage signal of the modulation power supply terminal or the reference power supply may be used to uniformly modulate the signals output by the drive circuit 20 to the plurality of sensing units 11.
  • the connection of the sensing unit 11 to the peripheral circuits (for example, the sensing driving circuit 22 and the reference signal generating circuit 23) can be reduced. foot.

Abstract

L'invention concerne un dispositif de détection capacitif et un appareil électronique. Ce dispositif de détection capacitif comprend une pluralité d'unités de détection (11) et un circuit d'attaque (20). Chaque unité de détection (11) comprend : une électrode de détection (111); un premier commutateur de commande (113) connecté à l'électrode de détection (111); et un second commutateur de commande (115) connecté au premier commutateur de commande (113). Le circuit d'attaque (20) : est connecté séparément aux premiers commutateurs de commande (113) et aux seconds commutateurs de commande (115) de la pluralité d'unités de détection (11), afin de mettre sous tension, à des moments différents, les premiers commutateurs de commande (113) et les seconds commutateurs de commande (115) de la pluralité d'unités de détection (11); transmet, par l'intermédiaire des premiers commutateurs de commande sous tension (113), un signal d'excitation à l'électrode de détection (111) afin que cette dernière effectue une opération de détection; et transmet, par l'intermédiaire des seconds commutateurs de commande sous tension (115), un premier signal de référence à l'électrode de détection (111).
PCT/CN2016/094245 2016-08-09 2016-08-09 Dispositif de détection capacitif et appareil électronique WO2018027594A1 (fr)

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