WO2018223337A1 - Procédé de détection pour appareil de capture capacitif - Google Patents

Procédé de détection pour appareil de capture capacitif Download PDF

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Publication number
WO2018223337A1
WO2018223337A1 PCT/CN2017/087597 CN2017087597W WO2018223337A1 WO 2018223337 A1 WO2018223337 A1 WO 2018223337A1 CN 2017087597 W CN2017087597 W CN 2017087597W WO 2018223337 A1 WO2018223337 A1 WO 2018223337A1
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WIPO (PCT)
Prior art keywords
electrodes
electrode
detecting method
signal
capacitive sensing
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PCT/CN2017/087597
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English (en)
Chinese (zh)
Inventor
林峰
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 CN201780000428.8A priority Critical patent/CN107438822B/zh
Priority to PCT/CN2017/087597 priority patent/WO2018223337A1/fr
Publication of WO2018223337A1 publication Critical patent/WO2018223337A1/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
    • 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 invention relates to a detection method of a capacitive sensing device.
  • capacitive sensing devices are widely used, for example, capacitive sensing devices are used in the fields of touch detection and fingerprint recognition.
  • capacitive sensing devices are used in the fields of touch detection and fingerprint recognition.
  • the cost of capacitive sensing devices is still high.
  • embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art. Therefore, embodiments of the present invention need to provide a method for detecting a capacitive sensing device.
  • the present invention provides a method of detecting a capacitive sensing device, the capacitive sensing device comprising a sensor unit, the sensor unit comprising a plurality of first electrodes and a second disposed in insulated from the plurality of first electrodes An electrode; the detection method includes:
  • An excitation signal is provided to the plurality of second electrodes.
  • the detecting method further includes receiving a sensing signal from the plurality of second electrode outputs to obtain sensing information.
  • the excitation signal and the predetermined reference voltage signal are both signals that are synchronously modulated by a modulated signal.
  • the detecting method further comprises: providing the modulated signal.
  • the modulation signal is provided to a ground of the capacitive sensing device.
  • the detecting method controls the remaining first electrodes to receive the predetermined reference voltage signal while controlling each of the first electrodes to be left floating.
  • the first electrode that is not suspended serves as a shield electrode.
  • the excitation signal is provided to the plurality of second electrodes in a time sharing manner.
  • the capacitive sensing device further includes a plurality of first switches, and The plurality of first electrodes are connected one by one, and the detecting method controls the plurality of first electrodes to be sequentially suspended by controlling the plurality of first switches to be sequentially turned off.
  • the detecting method further provides the predetermined reference voltage signal to the first electrode through the closed first switch.
  • the capacitive sensing device further includes a plurality of second switches connected in one-to-one correspondence with the plurality of second electrodes, the detecting method controlling the plurality of second switches by time sharing Closing to provide time division to provide the excitation signal to the plurality of second electrodes.
  • the detecting method further comprises: acquiring touch information or/and biometric information of the user according to the sensing signals output by the plurality of second electrodes.
  • the detecting method further includes: acquiring fingerprint information of the user according to the sensing signals output by the plurality of second electrodes.
  • the sensor unit further includes an insulating substrate and an insulating layer, the plurality of second electrodes are located on the insulating substrate, and the insulating layer is located on the plurality of second electrodes, a stripe first electrode is located on the insulating layer, a plurality of second coupling capacitors are formed at intersections of the plurality of first electrodes and the plurality of second electrodes, and the plurality of first electrodes are opposite to the plurality of strips One side of the second electrode is for receiving a proximity input of the user;
  • the first electrode that is not suspended serves as a shield electrode, and the first electrode that is suspended is used to form a first coupling capacitance with a user approaching or contacting the capacitive sensing device, the first coupling capacitor and the second The coupling capacitors are connected in series.
  • the detecting method of the capacitive sensing device can drive the sensor unit to perform a sensing operation, the sensor unit is lower in cost than the existing sensor unit having a rectangular block electrode having the same layer coplanar. Thereby, the cost of the capacitive sensing device can be reduced.
  • FIG. 1 is a schematic structural view of a conventional capacitive sensing device
  • FIG. 2 is a circuit block diagram of a capacitive sensing device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural view of an embodiment of the sensor unit of FIG. 2;
  • FIG. 4 is a schematic structural view of another embodiment of the sensor unit of FIG. 2;
  • FIG. 5 is a schematic cross-sectional view of a capacitive sensing device according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram showing a connection structure between a first electrode and a second electrode, a detecting unit, and a modulating unit in a capacitive sensing device according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram showing a connection structure of a first electrode and a second electrode corresponding to a reference circuit and a signal reading circuit in a capacitive sensing device according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of an equivalent circuit for performing capacitive sensing in a capacitive sensing device according to an embodiment of the present invention.
  • FIG. 9 is a flow chart showing a method of detecting a capacitive sensing device according to an embodiment of the present invention.
  • FIG. 10 is a schematic plan view of an electronic device according to an embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include one or more of the described features either explicitly or implicitly.
  • the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; may be mechanically connected, or may be electrically connected or may communicate with each other; may be directly connected or indirectly connected through an intermediate medium, may be internal communication of two elements or interaction of two elements relationship. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • FIG. 1 is a schematic structural view of a conventional capacitive sensing device.
  • the capacitive sensing device 100 includes a substrate 10, a plurality of sensing electrodes 12, and a detection circuit 16.
  • the plurality of sensing electrodes 12 are formed on the substrate 10, and the plurality of sensing electrodes 12 are arranged in a two-dimensional array, that is, the sensing array 14 is formed.
  • the plurality of sensing electrodes 12 are coplanar with each other, and each sensing electrode 12 forms a sensing pixel.
  • the detection circuit 16 is formed on the substrate 10 at the periphery of the sensing array 14.
  • the detecting circuit 16 is electrically connected to each sensing electrode 12 for providing an excitation signal to each sensing electrode 12, and driving each sensing electrode 12 to perform a sensing operation. Further, the detecting circuit 16 receives the sensing signal output from the sensing electrode 12 and acquires sensing information according to the sensing signal.
  • the capacitive sensing device 100 can be, for example, but not limited to, performing touch detection, and/or performing biological information detection.
  • the capacitive sensing device 100 is configured to detect organisms such as fingerprints, palm prints, and ear prints. Grain information.
  • the organism is, for example, a human body but is not limited to the human body, and may be other suitable organisms.
  • the detecting circuit 16 is electrically connected to each of the sensing electrodes 12, for example, by wires, if the number of sensing electrodes 12 is large, the arrangement of the wires will be greatly increased, thereby increasing the capacitance.
  • the manufacturing cost of the sensing device 100 in order to meet the electrical requirements, there must be a certain interval between the wires and the wires, so the more wires are arranged, the larger the size of the capacitive sensing device 100 is to ensure the yield of the capacitive sensing device 100, thereby It is not conducive to the miniaturization of the capacitive sensing device 100.
  • a small-sized biometric information sensing module or image sensing module is disposed, for example, in a non-display area of the mobile terminal, for example, at a location of a Home button, at a rear side of the mobile terminal, and at a side.
  • the biometric information sensing module or the image sensing module may be disposed in, for example, a display area of the mobile terminal.
  • the display area is an area where the mobile terminal displays an image.
  • FIG. 2 is a circuit block diagram of a capacitive sensing device 200 of the present invention
  • FIG. 3 is a schematic structural view of an embodiment of a sensor unit of the capacitive sensing device 200 of FIG.
  • the capacitive sensing device 200 can be used to perform any one or more of biological information sensing, touch sensing, and the like.
  • the capacitive sensing device 200 includes a sensor unit 22, a detecting unit 24, and a modulating unit 26.
  • the sensor unit 22 includes a plurality of first electrodes 222 and a plurality of second electrodes 224.
  • the plurality of first electrodes 222 and the plurality of second electrodes 224 are insulated and arranged in a cross.
  • the modulating unit 26 is operative to generate a modulated signal M.
  • the detecting unit 24 is configured to receive the modulation signal M, and provide the excitation signal Vref to the plurality of second electrodes 224, control the plurality of first electrodes 222 to be suspended, and provide a predetermined reference voltage signal. Vp is given to the first electrode 222 that is not suspended to drive the sensor unit 22 to perform a sensing operation.
  • the excitation signal Vref is a signal modulated by the modulation signal M.
  • the capacitive sensing device 200 of the present application includes the plurality of first electrodes 222 and the plurality of second electrodes 224, and the plurality of first electrodes 222 and the plurality of second electrodes 224 are insulated and intersected, Each of the intersections correspondingly forms a sensing pixel. Therefore, compared with the above-mentioned conventional capacitive sensing device, the capacitive sensing device of the present application ensures that the sensing pixel is sufficiently large. The number of wires to which the plurality of first electrodes 222 and the plurality of second electrodes 224 are connected to the detecting unit 24 is reduced, whereby the cost of the capacitive sensing device 200 can be reduced.
  • the capacitive sensing device 200 can also be developed toward miniaturization.
  • the excitation signal Vref is a signal modulated by the modulation signal M
  • the signal-to-noise ratio of the capacitive sensing device 200 can be improved, thereby improving the sensing of the capacitive sensing device 200. Precision.
  • the excitation signal Vref varies as the modulation signal M changes. For example, the excitation signal Vref increases as the modulation signal M increases, and decreases as the modulation signal M decreases.
  • the detecting unit 24 further receives the sensing signal Vd output from the second electrode 224 to acquire sensing information.
  • the predetermined reference voltage signal Vp is, for example, a signal modulated by the modulation signal M.
  • the plurality of first electrodes 222 are for capacitively coupling to a target object.
  • the capacitive sensing device 200 is configured to sense whether there is a touch of the target object, and/or to sense biometric information of the target object.
  • the biometric information is, for example, suitable texture information on a living body such as fingerprint information, palm print information, and ear print information.
  • the target object corresponds to, for example, a finger, a palm, an ear, or the like.
  • the detecting unit 24 causes the first electrode 222 to be suspended by disconnecting the first electrode 222.
  • the detecting unit 24 is disconnected from a first electrode 222, it is electrically reconnected with the previously disconnected first electrode 222.
  • the plurality of first electrodes 222 are spaced apart in the first direction, and each of the first electrodes 222 extends in the second direction.
  • the plurality of second electrodes 224 are spaced apart in the second direction, and each of the second electrodes 224 extends in the first direction.
  • the first direction is different from the second direction.
  • the first direction and the second direction are, for example but not limited to, a vertical relationship.
  • the first electrode 222 is arranged as a row electrode in the Y direction, that is, the first row, the second row, the third row, the mth row, where m is A natural number greater than 1.
  • the second electrode 224 is a column electrode and is sequentially arranged in the X direction, that is, the first column, the second column, the third column, the nth column, where n is a natural number greater than 1.
  • the intersection region between the plurality of first electrodes 222 and the plurality of second electrodes 224 forms a second coupling capacitor CF, that is, the capacitive sensing device 200 can be formed with m*n second coupling capacitors CF (see FIG. 6).
  • the first direction and the second direction may be set, for example, at a certain angle, for example, 45°, 60°, or the like.
  • the plurality of first electrodes 222 and the plurality of second electrodes 224 have a rectangular strip shape.
  • the plurality of first electrodes 222 and the plurality of second electrodes are variably 224 may also take other suitable shapes, such as curved strips and the like.
  • FIG. 4 is a schematic structural diagram of another embodiment of the sensor unit 22.
  • the plurality of first electrodes 222 are spaced apart along the first direction, and each of the first electrodes 222 includes a plurality of first sub-electrodes 222a and a wire 222b connecting the adjacent first sub-electrodes 222a.
  • Multiple second electrodes 224 Arranged in the second direction, and each of the second electrodes 224 includes a plurality of second sub-electrodes 224a and a wire 224b connecting the adjacent second sub-electrodes 224a.
  • the first direction and the second direction are different, such as, but not limited to, a vertical relationship. As shown in FIG.
  • the first electrode 222 is arranged as a row electrode in the Y direction, for example, the first row, the second row, the third row, the seventh row, and the second electrode 224 serves as a column electrode in the X direction. Arrange sequentially, for example, column 1, column 2, column 3, column 8.
  • the number 56 here is only an example, and the number of actual products is more or less than 56, and the manufacturer can set according to the product requirements.
  • first direction and the second direction may be set, for example, at a certain angle, for example, 45°, 60°, or the like.
  • first electrode 222 and the second electrode 224 are in the shape of a rectangular block.
  • first electrode 222 and the second electrode 224 may also have other suitable shapes. .
  • the lengths of the first electrode 222 and the second electrode 224 shown in FIG. 4 become shorter than those of the first electrode 222 and the second electrode 224 shown in FIG.
  • first electrode 222 and the structure of the second electrode 224 in the above embodiments may be variously combined and deformed as long as the first electrode 222 and the second electrode 224 are disposed in an insulated intersection.
  • the first electrode 222 and the second electrode 224 may be made of, for example, a transparent conductive material such as an indium tin oxide (ITO) material, an indium zinc oxide (IZO) material, or the like. However, the first electrode 222 and the second electrode 224 may also be made of other suitable electrically conductive materials, such as metal materials, alloy materials, and the like. Since the first electrode 222 and the second electrode 224 are both conductive electrodes, electrical isolation is performed between the first electrode 222 and the second electrode 224 by providing an insulating material.
  • ITO indium tin oxide
  • IZO indium zinc oxide
  • FIG. 5 is a schematic cross-sectional view of the capacitive sensing device 200 of the present application.
  • the sensor unit 22 described above may further include a substrate 220 and an insulating layer 226.
  • the plurality of second electrodes 224 are disposed on the substrate 220, the insulating layer 226 is disposed on the plurality of second electrodes 224, and the plurality of first electrodes 222 are disposed on the insulating layer 226.
  • the side of the plurality of first electrodes 222 facing away from the plurality of second electrodes 224 is configured to receive a proximity input of a user.
  • the area where the first electrode 222 and the second electrode 224 are defined is the sensing area I, and the area on the defining substrate 220 around the sensing area I is the non-sensing area II.
  • the detecting unit 24 and the modulating unit 26 are located in the non-sensing area II of the substrate 220.
  • the detection unit 24 and the modulation unit 26 are also permeable.
  • a connection member such as a flexible circuit board is connected to the substrate 220, and the detection unit 24 and the modulation unit 26 are not limited to be disposed on the substrate 220.
  • the substrate 220 is an insulating substrate, and is, for example, a suitable substrate such as a glass substrate or a film substrate.
  • the detecting unit 24 is integrated into a sensing chip, for example, by a silicon process
  • the modulation unit 26 is integrated into a control chip, for example, by a silicon process.
  • the detecting unit 24 and the modulating unit 26 are not limited to be integrated on one chip, and may be integrated on several chips, for example, two or three, as appropriate.
  • the sensing chip and the control chip are bonded to the substrate 220 by way of a chip on glass (COG) or a chip on film (COF).
  • COG chip on glass
  • COF chip on film
  • the detection unit 24 and the modulation unit 26 are further connected to an external circuit (not shown), for example, by a suitable connector such as a flexible circuit board.
  • the present application since the sensor unit 22 of the present application forms the first electrode 222 and the second electrode 224 on the insulating substrate 220, the present application includes the sensor unit compared to the sensor unit that forms the sensing electrode on the silicon substrate. The manufacturing cost of the capacitive sensing device 200 of 22 is further reduced.
  • the modulating unit 26 outputs the modulation signal M to the ground terminal c (see FIG. 8) of the detecting unit 24 as a ground signal of the detecting unit 24, for example.
  • the ground signal corresponds to a varying signal.
  • the electrical signals of the detecting unit 24 use the changed ground signal as a voltage reference signal. When the local signal changes, the electrical signal in the detecting unit 24 changes with the change of the ground signal. Thus, all signals of the detecting unit 24 are signals modulated by the modulation signal M.
  • the modulating unit 26 may also output the modulation signal M to the power terminal d (see FIG. 8) or the reference power terminal (not shown) of the detecting unit 24, and may also achieve detection. The effect of modulation of all signals in unit 24 is performed.
  • the signals on the plurality of first electrodes 222 and the plurality of second electrodes 224 are all modulated signals.
  • the M-modulated signal can thereby reduce the adverse effects of lateral parasitic capacitance between adjacent first electrodes 222, lateral parasitic capacitance between adjacent second electrodes 224, and the like.
  • the signal-to-noise ratio of the excitation signal Vref can be increased, thereby improving the signal-to-noise ratio of the sensing signal Vd, and further The step improves the sensing accuracy of the capacitive sensing device 200.
  • the sensor unit 22 described above may further include a protective layer 228.
  • the protective layer 228 is disposed on the plurality of first electrodes 222 and the insulating layer 266 to prevent the first electrode 222 from directly contacting the outside to damage the first electrode 222, thereby affecting the sensing effect.
  • the protective layer 228 may also be omitted in other embodiments.
  • the protective layer 228 can also be replaced with a package, and the sensor unit 22, the sensing chip, and the control chip are packaged in the package. Between the body and the substrate 220. The package is used to cover the sensor unit 22, the sensing chip and the control chip, and fill the gap between the sensor unit 22, the sensing chip and the control chip.
  • the package is, for example but not limited to, made of a material such as an epoxy resin.
  • FIG. 6 is a schematic diagram of a connection structure between the first electrode 222 and the second electrode 224 and the detecting unit 24 and the modulating unit 26.
  • a first coupling capacitance CS is formed between the target object 400 and the plurality of first electrodes 222.
  • a plurality of second coupling capacitors CF are formed between the plurality of first electrodes 222 and the plurality of second electrodes 224.
  • the first coupling capacitor CS formed between the suspended first electrode 222 and the target object 400 is connected in series with the second coupling capacitor CF between the detecting unit 24 and the ground.
  • the unsuspended first electrode 222 functions as a shield electrode due to receiving the predetermined reference voltage signal Vp, and accordingly, a first coupling capacitor CS formed between the unsuspended first electrode 222 and the target object 400 It is shielded and will not be detected by the detecting unit 24. Therefore, the first coupling capacitance CS formed between the target object 400 and the suspended first electrode 222 is critical to the detection unit 24 acquiring the sensing information and can be detected by the detecting unit 24.
  • the target object is the finger 400.
  • the human body is connected to the earth.
  • the first coupling capacitor CS and the second coupling capacitor CF are connected in series between the detecting unit 24 and the ground.
  • contact includes both direct touch and proximity.
  • the detection unit 24 includes a reference circuit 240, a plurality of first switches S1, and a control circuit 242.
  • the reference circuit 240 is connected to the plurality of first electrodes 222 in a one-to-one correspondence by the plurality of first switches S1.
  • the reference circuit 240 is configured to provide the predetermined reference
  • the voltage signal Vp is given to the plurality of first electrodes 222.
  • the control circuit 242 is connected to the plurality of first switches S1 for controlling the plurality of first switches S1 to be opened or closed. It should be noted that, in FIG. 6, since only one first electrode 222 is shown, only one first switch S1 is shown correspondingly.
  • the detecting unit 24 controls the plurality of first switches S1 to be sequentially turned off by the control circuit 242 to control the plurality of first electrodes 222 to be suspended in sequence.
  • the control circuit 242 controls the first switch S1 to be off for a predetermined time, the first switch 222 that is currently open is closed, and the other switch is closed again.
  • the first switch 222 Therefore, the plurality of first switches S1 are sequentially disconnected, so that the plurality of first electrodes 222 are suspended in order, thereby implementing a sensing operation.
  • the predetermined reference voltage signal Vp is a signal modulated by the modulated signal M by a constant voltage signal.
  • the predetermined reference voltage signal Vp can also be a constant voltage signal.
  • the reference circuit 240 is preferably disposed in the control chip instead of the sensing chip.
  • the reference circuit 240 is referenced to the voltage in the control chip as a system or device.
  • the signal on the system ground or device ground is typically a constant voltage signal of 0 volts.
  • the first switch S1 can be a thin film transistor switch.
  • amorphous silicon thin film transistor switches low temperature polysilicon thin film transistor switches, high temperature polysilicon thin film transistor switches, metal oxide thin film transistor switches, and the like.
  • the metal oxide thin film transistor switch is an indium gallium zinc oxide (IGZO) thin film transistor switch.
  • the gate is a control electrode for controlling on/off of the switch; the source is a first transmission electrode and is connected to the reference circuit 240; the drain is a second transmission electrode and is connected to the first electrode 222.
  • the first switch S1 may also be other suitable types of switches, such as a bipolar transistor switch.
  • the first switch S1 can also be an electromagnetic switch, such as a relay or the like.
  • the first switch S1 is a suitable type of switch such as a thin film transistor, the plurality of first switches S1 may be formed directly on the substrate 220, thereby reducing manufacturing costs.
  • the detecting unit 24 may further include a plurality of signal reading circuits 244 for connecting with the plurality of second electrodes 222.
  • the excitation signal Vref is supplied to the plurality of second electrodes 224, and the sensing signals Vd output by the plurality of second electrodes 224 are received to obtain sensing information.
  • the number of the plurality of signal reading circuits 244 is equal to the number of the second electrodes 224, and the plurality of signal reading circuits 244
  • the plurality of second electrodes 224 are connected in one-to-one correspondence.
  • the plurality of signal reading circuits 244 can simultaneously output the excitation signal Vref to all of the second electrodes 222, and simultaneously read all of the sensing signals Vd outputted by the second electrodes 224.
  • each of the second electrodes 224 is respectively connected to a signal reading circuit 244.
  • the number of the plurality of signal reading circuits 244 is less than the number of the plurality of second electrodes 224. Accordingly, at least some or all of the signal reading circuits 244 are multiplexed, and the second electrodes 224 located at different positions are time-divisionally driven to operate.
  • the detection unit 24 may further include a plurality of second switches S2.
  • the plurality of second switches S2 are connected to the plurality of second electrodes 224 in one-to-one correspondence.
  • the control circuit 242 is connected to the plurality of second switches S2 for controlling the plurality of second switches S2 to be opened or closed.
  • the number of the plurality of signal reading circuits 244 is less than the number of the plurality of second switches S2. At least part or all of the signal reading circuit 244 is respectively connected to at least two second switches S2, and the signal reading circuit 244 connecting at least two second switches S2 drives the second electrodes 224 respectively connected to the at least two second switches S2. .
  • the number of the plurality of second switches S2 is twice that of the plurality of signal reading circuits 244, and each of the signal reading circuits 244 is connected to the two second switches S2.
  • the control circuit 242 for example, simultaneously controls a half of the number of second switches S2 to be closed at the same time, and all of the signal reading circuits 244 simultaneously drive half of the number of second electrodes 224 by half of the closed second switch S2.
  • the plurality of signal reading circuits 244 drive all of the second electrodes 224 to perform a complete detection by two switchings.
  • the number of the plurality of signal reading circuits 244 is greatly reduced by time division multiplexing, thereby reducing the manufacturing cost of the capacitive sensing device 200.
  • the plurality of signal reading circuits 244 are electrically connected to the plurality of second electrodes 224 in a time division manner.
  • the opening or closing of the second switch S2 is controlled by the control circuit 242, so that the plurality of signal reading circuits 244 perform time-divisional reading of the sensing signal Vd output by the second electrode 224.
  • each of the signal reading circuits 244 is connected to two second switches S2, taking the first signal reading circuit 244 located on the left side as an example.
  • the control circuit 242 first controls and A second switch S2a connected to the signal reading circuit 244 and located on the left side is closed, and controls the second switch S2b located on the right side to be disconnected; the sense of the second electrode 224 to be connected to the second switch S2a After the measurement signal Vd is read, the second circuit S2b connected to the control circuit 242 and the control signal reading circuit 244 is closed, and the second switch S2a is turned off to read the second connection with the second switch S2b.
  • the sensing signal Vd of the electrode 224 is actuates
  • the number of the plurality of second switches S2 is three times that of the plurality of signal reading circuits 244, and each of the signal reading circuits 244 is connected to three second switches S2, and accordingly, all signals are read.
  • the circuit 244 simultaneously drives one-third of the second electrode 224 to operate at a time.
  • the plurality of signal reading circuits 244 drive all of the second electrodes 224 to perform a complete detection.
  • the foregoing description of the number of signal reading circuits 244 is merely illustrative. However, the present application is not limited thereto, and the manufacturer may correspondingly set a corresponding number of signal reading circuits 244 according to product specifications and product quality requirements.
  • the plurality of second switches S2 are, for example, suitable switches of a thin film transistor or the like, the plurality of second switches S2 may also be disposed on the substrate 220.
  • the control circuit 242 controls the first switch S1 to be turned off, for example, row by row.
  • the control circuit 242 can also control the first switch S1 to be disconnected by interlacing.
  • the control circuit 242 first controls the first switch S1 located in the odd row to be disconnected one by one, and then controls the even row.
  • a switch S1 is disconnected one by one.
  • the control circuit 242 controls the turn-off timing of the plurality of first switches S1 not to be recited herein, as long as the control circuit 242 controls the current first switch S1 to turn off and controls the previous disconnection.
  • the first switch S1 is closed, and operating in such a controlled manner, such that all of the first switches S1 are sequentially turned off can fall within the scope of protection of the present application.
  • the reference circuit 240 of FIG. 7 has an output terminal (not shown) for outputting a predetermined reference voltage signal, and the output terminal is respectively connected to the plurality of first switches S1, thereby reducing the manufacturing cost of the capacitive sensing device 200.
  • a plurality of reference circuits may be provided, each reference circuit correspondingly outputs a predetermined reference voltage signal, and each reference signal source is connected in one-to-one correspondence with the plurality of first switches S1.
  • the reference circuit 240 includes a plurality of outputs coupled to the plurality of first switches S1.
  • the signal reading circuit 244 includes an amplifier Q and a feedback branch F.
  • the amplifier Q includes an in-phase terminal a, an inverting terminal b, a ground terminal c, a power terminal d, and an output terminal Vout
  • the feedback branch F is connected to the inverting terminal b and the output terminal Vout.
  • the inverting terminal b is further connected to the second electrode 224 through the second switch S2.
  • the non-inverting terminal a is for receiving the excitation signal Vref.
  • the ground terminal c is used to load the modulation signal M.
  • the power terminal d is used to load a power voltage.
  • the feedback branch F includes a feedback capacitor CB and a third switch S3.
  • the feedback capacitor CB and the third switch S3 are connected in parallel between the inverting terminal b and the output terminal Vout.
  • the amplifier Q is in a virtual short state, and the voltages of the non-inverting terminal a and the inverting terminal are the same.
  • the excitation signal Vref is sequentially output to the second electrode 224 through the non-inverting terminal a, the inverting terminal b, and the closed second switch S2.
  • the control circuit 242 controls the plurality of first switches S1 to be sequentially turned off, and the reference circuit 240 supplies a predetermined reference voltage signal Vp to the first electrode 222 through the closed first switch S1. For example, when there is a finger 400 (see FIG.
  • the detecting unit 24 can acquire corresponding sensing information according to the sensing signal Vd output by the plurality of second electrodes 224. For example, acquiring fingerprint image information, or acquiring touch operation information.
  • the capacitive sensing device 200 performs fingerprint sensing, for example, since the fingerprint of the finger 400 includes a ridge and a valley, the first coupling capacitor CS is formed between the ridge and the suspended first electrode 222. The capacitance value is greater than the capacitance value of the first coupling capacitor CS formed between the valley and the floating first electrode 222.
  • the signal reading circuit 244 is not limited to the circuit shown in FIG. 8 of the present application, and may be other suitable types of circuits as long as the excitation signal Vref is transmitted to the second electrode 224 and the output from the second electrode 224 is received.
  • the sensing signal Vd falls within the scope of protection of the present application.
  • the detecting unit 24 of the present application may further add a circuit such as a filter circuit, an amplifying circuit, an analog-to-digital conversion circuit, and the like after the output terminal Vout.
  • a circuit such as a filter circuit, an amplifying circuit, an analog-to-digital conversion circuit, and the like after the output terminal Vout.
  • FIG. 9 is an embodiment of a method for detecting a capacitive sensing device of the present application. Flow chart. The detection method includes:
  • Step S1 controlling the plurality of first electrodes to be suspended in sequence
  • Step S2 providing a predetermined reference voltage signal to the first electrode that is not suspended.
  • Step S3 providing an excitation signal to the plurality of second electrodes.
  • controlling the plurality of first electrodes to be suspended in sequence in step S1 means that only one first electrode is in a floating state during each control, and the remaining first electrodes are in a state of being unsuspended.
  • each control if it is necessary to control the first electrode to be in a floating state, assuming that the first electrode is currently in a floating state, the first electrode is not controlled, and the first electrode is currently in a non-floating state. And controlling the first electrode to be in a floating state.
  • the detecting method further includes receiving a sensing signal from the plurality of second electrode outputs to obtain sensing information.
  • the excitation signal and the predetermined reference voltage signal are both signals that are synchronously modulated by a modulated signal. Since the excitation signal and the predetermined reference voltage signal are both signals modulated by the modulation signal, the signal-to-noise ratio of the capacitive sensing device can be improved, thereby improving the capacitive sensing device. Sensing accuracy.
  • the detecting method further comprises: providing the modulated signal.
  • the modulated signal is for example but not limited to a square wave signal, a sine wave signal, a sawtooth wave signal, and the like.
  • the modulation signal is provided to a ground of the capacitive sensing device.
  • the ground signal of the capacitive sensing device is provided as a ground signal of the capacitive sensing device. Therefore, the ground signal is a signal corresponding to the change, and correspondingly, the electrical signal of the capacitive sensing device uses the changed ground signal as the voltage reference signal.
  • the detecting method controls the remaining first electrodes to receive the predetermined reference voltage signal while controlling each of the first electrodes to be left floating.
  • the first electrode that is not suspended serves as a shield electrode.
  • the first electrode forms a first coupling capacitance with the target object in a capacitive coupling manner, and the first electrode that is not suspended is used as a shielding electrode due to receiving a predetermined reference voltage signal.
  • the first coupling capacitance formed between the first electrode and the target object that is not suspended is shielded and is not detected when capacitive sensing is performed.
  • the excitation signal is provided to the plurality of second electrodes in a time sharing manner.
  • the excitation signal is provided twice in succession, the excitation signal is first supplied to a part of the second electrode, the second electrode is driven to operate, and then the excitation signal is supplied to the remaining second electrode to drive the remaining The second electrode works.
  • the time division multiplexing of the excitation signals the number of excitation signal supply sources can be greatly reduced, thereby also reducing the manufacturing cost of the capacitive sensing device.
  • the number of times the excitation signal is provided in the present application is only an example, and the present application is not limited thereto.
  • the excitation signal may be provided in three or four times.
  • the capacitive sensing device further includes a plurality of first switches connected in one-to-one correspondence with the plurality of first electrodes, the detecting method sequentially cutting the plurality of first switches Turning on, to control the plurality of first electrodes to be suspended in sequence.
  • the detecting method further provides the predetermined reference voltage signal to the first electrode through the closed first switch.
  • the capacitive sensing device further includes a plurality of second switches connected in one-to-one correspondence with the plurality of second electrodes, the detecting method controlling the plurality of second switches by time sharing Closing to provide time division to provide the excitation signal to the plurality of second electrodes.
  • the detecting method further comprises: acquiring touch information or/and biometric information of the user according to the sensing signals output by the plurality of second electrodes.
  • the detecting method further includes: acquiring fingerprint information of the user according to the sensing signals output by the plurality of second electrodes.
  • the sensor unit further includes an insulating substrate and an insulating layer, the plurality of second electrodes are located on the insulating substrate, and the insulating layer is located on the plurality of second electrodes, a stripe first electrode is located on the insulating layer, a plurality of second coupling capacitors are formed at intersections of the plurality of first electrodes and the plurality of second electrodes, and the plurality of first electrodes are opposite to the plurality of strips One side of the second electrode is for receiving a proximity input of the user;
  • the first electrode that is not suspended serves as a shield electrode, and the first electrode that is suspended is used to form a first coupling capacitance with a user approaching or contacting the capacitive sensing device, the first coupling capacitor and the second The coupling capacitors are connected in series.
  • the detecting method of the capacitive sensing device can drive the sensor unit to perform a sensing operation, the sensor unit is lower in cost than the existing sensor unit having a rectangular block electrode having the same layer coplanar. Thereby, the cost of the capacitive sensing device can be reduced.
  • the capacitive sensing device is the capacitive sensing device 200 of any of the above embodiments.
  • FIG. 10 is a schematic structural diagram of an embodiment of an electronic device according to the present application.
  • the electronic device 500 is, for example but not limited to, any suitable type of product such as a consumer electronics product, a home electronics product, a vehicle-mounted electronic product, or a wearable electronic product.
  • consumer electronic products such as mobile phones, tablets, notebook computers, desktop monitors, computer integrated machines and other suitable electronic products.
  • Home-based electronic products such as smart door locks, televisions, refrigerators and other suitable electronic products.
  • the vehicle-mounted electronic products are, for example, various suitable electronic products such as car navigation systems and car DVDs.
  • Wearable electronic products such as watches, bracelets, rings and other suitable electronic products.
  • the electronic device 500 includes the capacitive sensing device 200 of any of the above embodiments.
  • the electronic device 500 can further include a display area 501 and a non-display area 502.
  • the electronic device 500 is configured to display a display screen corresponding to the display area 501 for displaying a screen or the like.
  • the non-display area 502 is located around the display area 501.
  • the front surface of the electronic device 500 includes a protective cover 503.
  • the capacitive sensing device 200 is, for example, a biometric information sensing module or an image sensing module, and is disposed in the non-display area 502 of the electronic device 500, for example, at a position corresponding to the Home button. Specifically, the capacitive sensing device 200 can be hidden under the protective cover 503. Alternatively, the capacitive sensing device 200 can also be exposed at a through hole of the protective cover 503. In addition, the capacitive sensing device 200 may be disposed at a suitable position such as a side surface or a back surface of the electronic device 500.
  • the capacitive sensing device 200 when the capacitive sensing device 200 is a biological information sensing module or an image sensing module, the capacitive sensing device 200 can also be located in the display area 501, for example, the capacitive sensing The sensor unit 22 (see FIG. 3) of the device 200 is located in a partial area of the display area 501.
  • the capacitive sensing device 200 is a biometric information sensing module or an image sensing module
  • the biometric information sensing module or the image sensing module may also perform touch sensing.
  • the sensor unit 22 (see FIG. 3) of the capacitive sensing device 200 can also be located in the entire area of the display area 501.
  • the capacitive sensing device 200 performs touch sensing and biometric information sensing.
  • the capacitive sensing device 200 is for performing touch sensing, and the local region is for performing biometric information sensing.
  • the capacitive sensing device 200 can also perform touch sensing and biometric information sensing and the like in a time division manner, and thus, the electronic device 500 can perform biometric information sensing in full screen.

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

Abstract

L'invention concerne un procédé de détection pour un appareil de capture capacitif. L'appareil de capture capacitif inclut une unité à capteurs comportant une pluralité de premières électrodes, et des secondes électrodes agencées avec les premières électrodes de manière à se croiser et à être isolées. Le procédé de détection comprend les étapes qui consistent : à commander la pluralité de premières électrodes pour qu'elles s'interrompent successivement (S1) ; à fournir un signal de tension de référence prédéfini à une première électrode non interrompue (S2) ; et à fournir des signaux d'excitation à la pluralité de secondes électrodes (S3).
PCT/CN2017/087597 2017-06-08 2017-06-08 Procédé de détection pour appareil de capture capacitif WO2018223337A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780000428.8A CN107438822B (zh) 2017-06-08 2017-06-08 电容式传感装置的检测方法
PCT/CN2017/087597 WO2018223337A1 (fr) 2017-06-08 2017-06-08 Procédé de détection pour appareil de capture capacitif

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150160763A1 (en) * 2012-09-24 2015-06-11 Panasonic Intellectual Property Management Co., Ltd. Input device and liquid crystal display device
CN105320380A (zh) * 2014-07-04 2016-02-10 株式会社日本显示器 显示装置及其驱动方法
CN105929576A (zh) * 2016-07-04 2016-09-07 京东方科技集团股份有限公司 一种调光装置及其控制方法、车载设备及其控制方法
CN106055158A (zh) * 2016-04-13 2016-10-26 友达光电股份有限公司 触控显示面板及其驱动方法

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JP4968276B2 (ja) * 2009-02-24 2012-07-04 ソニー株式会社 表示装置およびその製造方法
TWI431362B (zh) * 2009-05-29 2014-03-21 Japan Display West Inc 觸控感測器、顯示器及電子裝置

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Publication number Priority date Publication date Assignee Title
US20150160763A1 (en) * 2012-09-24 2015-06-11 Panasonic Intellectual Property Management Co., Ltd. Input device and liquid crystal display device
CN105320380A (zh) * 2014-07-04 2016-02-10 株式会社日本显示器 显示装置及其驱动方法
CN106055158A (zh) * 2016-04-13 2016-10-26 友达光电股份有限公司 触控显示面板及其驱动方法
CN105929576A (zh) * 2016-07-04 2016-09-07 京东方科技集团股份有限公司 一种调光装置及其控制方法、车载设备及其控制方法

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