WO2016112781A1 - Electronic device and capacitive sensing system thereof, and detection method for capacitive sensing system - Google Patents

Electronic device and capacitive sensing system thereof, and detection method for capacitive sensing system Download PDF

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Publication number
WO2016112781A1
WO2016112781A1 PCT/CN2015/099560 CN2015099560W WO2016112781A1 WO 2016112781 A1 WO2016112781 A1 WO 2016112781A1 CN 2015099560 W CN2015099560 W CN 2015099560W WO 2016112781 A1 WO2016112781 A1 WO 2016112781A1
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Prior art keywords
signal
capacitive sensing
voltage
sensing system
modulation
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PCT/CN2015/099560
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French (fr)
Chinese (zh)
Inventor
刘雪春
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深圳信炜科技有限公司
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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 CN201580002461.5A priority Critical patent/CN105793869A/en
Publication of WO2016112781A1 publication Critical patent/WO2016112781A1/en

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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
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving

Definitions

  • the present invention relates to a capacitive sensing system, an electronic device having the capacitive sensing system, and a method for detecting a capacitive sensing system, and more particularly to a fingerprint sensing system having the fingerprint sensing The electronic device of the system and a detection method of the fingerprint sensing system.
  • more and more electronic devices are provided with one or more sensing systems, such as a touch sensing system for sensing touch operations, for sensing human biometrics.
  • a touch sensing system for sensing touch operations
  • the biometric sensing system or the like includes fingerprints, palm prints, and the like, and the touch sensing system and the biometric sensing system mostly perform sensing operations with a capacitive sensing system.
  • the capacitive sensing system typically includes a sensor board for capacitively coupling to a target object, and a capacitance detecting circuit, such as a user's finger.
  • the capacitance detecting circuit provides a driving signal to the sensor board and receives a sensing signal from the output of the sensor board, thereby implementing predetermined information for sensing the target object.
  • the predetermined information is biometric information, touch information, or the like.
  • the capacitance detecting circuit generally includes a power terminal, a ground terminal, and a signal transmission terminal.
  • the power terminal and the ground terminal are configured to receive a power supply voltage to ensure that the capacitance detecting circuit works normally.
  • the signal transmission end is a third end different from the power end and the ground end, and the signal transmission end is configured to transmit a signal between the capacitance detecting circuit and the sensor board, such as the driving signal and the sensing signal.
  • the present invention provides a capacitive sensing system with high sensing accuracy, an electronic device having the capacitive sensing system, and a detecting method of the capacitive sensing system.
  • the present invention provides the following technical solutions:
  • a capacitive sensing system comprising:
  • a sensor board for capacitively coupling to a target object to perform a sensing operation
  • the capacitance detecting circuit includes a signal transmitting end and a ground end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing
  • the ground of the capacitance detecting circuit is used to load a first modulation signal, and the first excitation signal changes as the first modulation signal changes.
  • the first excitation signal changes with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
  • the first modulation signal and the first excitation signal are voltage signals, and a voltage of the first excitation signal increases as a voltage of the first modulation signal increases, along with the first modulation The voltage of the signal is lowered and lowered.
  • the invention further provides an electronic device comprising a capacitive sensing system.
  • the capacitive sensing system includes:
  • a sensor board for capacitively coupling to a target object to perform a sensing operation
  • the capacitance detecting circuit includes a signal transmitting end and a ground end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing Operating, the ground of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal is associated with the first modulation signal The number changes and changes.
  • the invention further provides a capacitive sensing system comprising:
  • a sensor board for coupling to a target object in a capacitive coupling manner to perform a sensing operation
  • the capacitance detecting circuit includes a signal transmitting end and a modulation end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing Operation, the modulation end of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal changes according to a change of the first modulation signal.
  • the voltage in the capacitance detecting circuit varies with the voltage of the modulation terminal.
  • the first excitation signal changes with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
  • the first modulation signal and the first excitation signal are voltage signals, and a voltage of the first excitation signal increases as a voltage of the first modulation signal increases, along with the first modulation The voltage of the signal is lowered and lowered.
  • the invention further provides an electronic device comprising a capacitive sensing system.
  • the capacitive sensing system includes:
  • a sensor board for coupling to a target object in a capacitive coupling manner to perform a sensing operation
  • the capacitance detecting circuit includes a signal transmitting end and a modulation end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing Operation, the modulation end of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal changes according to a change of the first modulation signal.
  • the present invention also provides a method for detecting a capacitive sensing system, the capacitive sensing system comprising a plurality of capacitive sensing plates and a capacitance detecting circuit, the capacitance detecting circuit comprising a modulation end, the detecting method comprising:
  • the sensing plate performs a sensing operation
  • the first excitation signal changes as the first modulation signal changes.
  • the first excitation signal varies with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the plurality of capacitive sensing plates and the modulation end.
  • the voltage in the capacitance detecting circuit increases as the voltage of the first modulation signal increases, and decreases as the voltage of the first modulation signal decreases.
  • the above capacitive sensing system, electronic device and detecting method of the present invention change the first excitation signal according to the change of the first modulation signal by providing the first modulation signal, thereby improving the sensing precision.
  • FIG. 1 is a block diagram showing the structure of an electronic device according to a preferred embodiment of the present invention.
  • FIG. 2 is a schematic structural view of an embodiment of the sensor board shown in FIG. 1.
  • FIG. 2 is a schematic structural view of an embodiment of the sensor board shown in FIG. 1.
  • FIG. 3 is a waveform diagram of a first excitation signal and a first modulation signal.
  • FIG. 4 is a waveform diagram of another embodiment of the first modulated signal.
  • FIG. 5 is a schematic structural view of the capacitance detecting circuit shown in FIG. 1.
  • FIG. 6 is a schematic diagram showing the circuit structure of the sensing unit shown in FIG. 5.
  • Fig. 7 is a schematic view showing the distribution of electric field lines between the sensor board and the finger.
  • Fig. 8 is a structural schematic view showing the arrangement of shield electrodes in the area around the sensor board shown in Fig. 2.
  • FIG. 9 is a schematic view showing the electric field line distribution between the sensor board and the finger shown in FIG. 8.
  • FIG. 10 is a front view showing a package structure of a capacitance detecting circuit chip packaged in a QFN manner.
  • FIG. 11 is a cross-sectional structural view of the capacitance detecting circuit chip package structure shown in FIG. 10 taken along line XI-XI.
  • FIG. 12 is a front view showing a package structure of a capacitance detecting circuit chip packaged in a BGA mode.
  • FIG. 13 is another schematic structural diagram of an electronic device according to the present invention.
  • FIG. 14 is a flow chart of a method for detecting a capacitive sensing system of the present invention.
  • the sensing accuracy of the capacitive sensing system of the existing electronic device is relatively low, and the factors affecting the sensing accuracy of the capacitive sensing system are relatively low, and a large amount of research by the inventors It is found that there is a parasitic capacitance between the ground terminal of the capacitance detecting circuit and the sensor board, and the ground terminal is usually loaded with a constant voltage signal, and the sensor board is loaded with a constantly changing voltage signal, so that the parasitic capacitance There is charge and discharge.
  • the electric charge detected by the capacitance detecting circuit includes not only the electric charge caused by the voltage change between the target object and the sensor plate but also the electric charge caused by the change of the parasitic capacitance. Affects sensing accuracy.
  • the inventor correspondingly proposes a capacitive sensing system with high sensing accuracy and has the capacitive feeling through a large amount of creative labor.
  • Measuring the electronic equipment of the system is either a touch sensing system, or a biometric sensing system, or a multi-function sensing system, or other suitable type of sensing system, such as a multi-functional sensing system, for example A system that can perform both a touch sensing function and a biometric sensing function.
  • the biometric sensing system is a sensing system such as a fingerprint, a palm print, or other suitable type of biometric sensing system.
  • the first modulation signal is a modulation signal used for biometric sensing
  • the second modulation signal is a modulation signal for detecting whether there is a touch operation, but, understandably, it can also be used for biological
  • the modulation signal during feature sensing is named as the second modulation signal.
  • the modulation signal used to detect whether there is a touch operation is named as the first modulation signal. Therefore, this document does not limit the name "first modulation signal” to the modulation signal used for biometric sensing.
  • the name "second modulation signal” is a modulation signal for detecting whether there is a touch operation.
  • the names of the first power signal and the second power signal are also interchangeable.
  • FIG. 1 is a block diagram of a preferred embodiment of an electronic device according to the present invention.
  • the electronic device 100 is, for example, a mobile phone, a tablet computer, a GPS navigation system, a television, and the like.
  • the electronic device 100 includes a capacitive sensing system 10.
  • the capacitive sensing system 10 is configured to sense predetermined information of the target object 1 and determine whether to perform a corresponding function according to the sensed predetermined information.
  • the predetermined information includes biometric information or/and touch information.
  • the biometric information includes fingerprint information.
  • the touch information is whether a target object approaches or touches the capacitive sensing system 10.
  • the target object 1 may be a finger, or may be other parts of the user's body, such as a toe, etc., or even other suitable types of objects, and is not limited to the human body.
  • the fingerprint sensing system is configured to sense fingerprint information. If the sensed fingerprint information is consistent with the pre-stored fingerprint information, the booting is performed correspondingly. The functions of unlocking, paying, and directly calling a predetermined application; if the sensed fingerprint information is inconsistent with the pre-stored fingerprint information, the function is not performed.
  • the predetermined application program is, for example, Weibo, WeChat, etc., and the predetermined application program can be directly invoked when the electronic device 100 is in a standby state, a lock screen, or the like.
  • the touch sensing system 10 is configured to sense a touch operation, and if a touch or proximity of the target object 1 is sensed, a trigger function is performed correspondingly.
  • a predetermined device in the trigger electronic device 100 starts to work or starts to perform another job.
  • the capacitive sensing system 10 is combined with touch sensing and fingerprint sensing.
  • the capacitive sensing system 10 first performs a touch sensing function.
  • the touch sensing function is switched to perform a fingerprint sensing function, and the target object 1 is sensed.
  • the fingerprint if the sensed fingerprint is consistent with the preset fingerprint, performs corresponding functions correspondingly.
  • the capacitive sensing system 10 switches to the touch sensing function to achieve the effect of saving power.
  • the capacitive sensing system 10 includes a sensor board 11 and a capacitance detecting circuit 13.
  • the sensor board 11 is for capacitively coupling to the target object 1 to perform a sensing operation.
  • the capacitance detecting circuit 13 includes a signal transmitting terminal T and a ground terminal 13a.
  • the capacitance detecting circuit 13 is configured to provide a first excitation signal to the sensor board 11 through the signal transmitting end T to drive the sensor 11 board to perform a sensing operation, thereby obtaining predetermined information of the target object 1.
  • the ground terminal 13a of the capacitance detecting circuit 13 is for loading a first modulation signal, and the first excitation signal changes as the first modulation signal changes.
  • the first excitation signal varies with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
  • the first excitation signal changes with the change of the first modulation signal, thereby reducing the parasitic capacitance C1 between the ground terminal 13a and the sensor board 11. Charge and discharge. Further, the effect of the parasitic capacitance C1 on the superposition of the capacitance between the sensor board 11 and the target object 1 is reduced, and the sensing accuracy can be improved.
  • the first modulation signal and the first excitation signal are voltage signals.
  • the voltage of the first excitation signal increases as the voltage of the first modulation signal increases, and decreases as the voltage of the first modulation signal decreases.
  • the magnitude of the amplitude change of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal. Therefore, the charge and discharge electric quantity of the parasitic capacitance C1 between the ground end 13a and the sensor board 11 is made zero, and accordingly, the parasitic capacitance C1 is equivalent to zero. Further, the superimposing effect of the parasitic capacitance C1 on the capacitance between the sensor board 11 and the target object 1 is eliminated, so that the sensing accuracy can be further improved.
  • the first excitation signal and the first modulation signal are periodic The signal of change.
  • the present invention does not limit the first excitation signal and the first modulation signal to periodically change signals.
  • the first excitation signal and the first modulation signal may also be non- The periodically changing signal can be reduced in charge and discharge amount of the parasitic capacitance between the ground terminal 13a and the sensor plate 11 as long as the two are synchronously changed.
  • the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and the
  • the phase of an excitation signal has a certain delay with respect to the phase of the first modulated signal, and the delay is, for example, 1 nanosecond.
  • the capacitance detecting circuit 13 detects predetermined information of the target object 1 by measuring the capacitance between the sensor board 11 and the target object 1.
  • the capacitance detecting circuit 13 loads the first modulation signal through the ground terminal 13a, and provides a first excitation signal that changes according to the change of the first modulation signal to perform self-capacitance detection on the sensor board 11. To achieve the sensing operation.
  • FIG. 2 is a schematic structural view of an embodiment of the sensor board 11 shown in FIG.
  • the sensor board 11 includes a plurality of capacitive sensing pads 11a.
  • the plurality of capacitive sensing plates 11a are rectangular.
  • the shape of the plurality of capacitive sensing plates 11a is not limited thereto.
  • the sensing plate 11a can also be of other regular or irregular shapes.
  • the plurality of capacitive sensing pads 11a are arranged in an array of sensing for performing sensing operations. It should be noted that the plurality of capacitive sensing plates 11a may be arranged in a regular array, such as a square matrix, or may be arranged in an irregular manner.
  • each of the capacitive sensing plates 11a forms a self-capacitance.
  • the self-capacitance detection is to detect a change in self-capacitance caused by the input of the capacitive sensing plate 11a due to the target object 1 (for example, a fingerprint).
  • the capacitive sensing system 10 as a fingerprint sensing system and the target object 1 as a finger
  • the voltage on the sensor board 11 changes, and the sensor board 11
  • the amount of electricity stored by the capacitor between the finger and the finger occurs Change, by detecting the amount of change in the amount of electricity, you can measure the size of the capacitor. Since the voltage on the sensor board 11 and the ground terminal 13a changes substantially synchronously, the voltage difference between the sensor board 11 and the ground terminal 13a remains unchanged, and the parasitic capacitance C1 is not charged and discharged, so that its equivalent capacitance is zero.
  • the electric charge detected by the capacitance detecting circuit 13 is basically caused by the voltage change of the capacitance directly formed by the sensor board 11 and the finger, and the influence of the parasitic capacitance C1 is reduced.
  • the greater the amplitude of the first modulation signal applied on the ground terminal 13a the greater the voltage change between the sensor board 11 and the finger, and correspondingly, the greater the change in the charge of the capacitor formed by the sensor board 11 and the finger.
  • the change in the amount of charge detected by the capacitance detecting circuit 13 is larger. If the noise does not change, the signal-to-noise ratio detected by the capacitance detecting circuit 13 from the sensing signal output from the sensor board 11 will increase linearly. Therefore, increasing the amplitude peak-to-peak value of the first modulation signal applied to the ground terminal 13a increases the signal-to-noise ratio of the capacitance detecting system 10, for example, to 10V, 15V, or even 20V.
  • FIG. 3 is a schematic diagram of waveforms of a first excitation signal and a first modulation signal.
  • the letter "M” represents the first excitation signal and the letter “N” represents the first modulation signal.
  • a square wave signal in which the first modulation signal and the first excitation signal are periodically changed will be described as an example.
  • the low level of the first modulation signal is 0V, and the high level is 10V.
  • the low level of the first excitation signal is 1.2V, and the high level is 11.2V.
  • the high level and the low level of the first modulation signal and the first excitation signal may also be other voltages, and other suitable types of signals, such as sine waves.
  • the ground terminal 13 a is used to load a first power signal, and the first power signal includes the first modulation signal.
  • the capacitance detecting circuit 13 further includes a power terminal 13b, the power terminal 13b is loaded with a second power signal, the second power signal is a voltage signal, and the voltage of the power signal is higher than the voltage of the first power signal.
  • the second power signal changes as the first modulation signal changes, or the second power signal changes as the first power signal changes.
  • the voltage difference between the second power signal and the first power signal is a power voltage at which the capacitance detecting circuit 13 operates.
  • the capacitance detecting circuit 13 The other voltages increase as the voltage of the first power signal increases, and decrease as the voltage of the first power signal decreases.
  • the voltage of the second power signal increases as the voltage of the first modulation signal increases, decreases as the voltage of the first modulation signal decreases, or the voltage of the second power signal follows The voltage of the first power signal rises and rises, and decreases with the voltage of the first power signal.
  • the second power signal and the first modulated signal are co-frequency signals, or the second power signal and the first power signal are co-frequency signals.
  • the first modulated signal includes only a square wave signal in which two levels of high and low are alternately changed.
  • the first modulated signal is not limited to two levels of high and low. Alternate changes.
  • the first modulation signal is a signal including at least a first level and a second level, and a voltage of the first level is different from a voltage of the second level.
  • the first level is a high level, such as 10V
  • the second level is a low level, such as 0V.
  • the first level may also be a low level
  • the second level is a high level
  • the voltage levels of the high and low levels may also be adjusted according to actual needs.
  • the first modulated signal includes a square wave signal that alternates between a first level and a second level.
  • the first modulated signal is a periodically varying square wave signal.
  • the first modulated signal is not limited to a square wave signal, and may be other suitable types of signals such as a sine wave, a triangular wave, and the like.
  • the voltage conditions of the first level and the second level are any one of the following three cases:
  • the voltage of the first level is a positive voltage, and the voltage of the second level is 0V;
  • the voltage of the first level is 0V, and the voltage of the second level is a negative voltage
  • the voltage of the first level is a positive voltage
  • the voltage of the second level is a negative voltage
  • the absolute value of the voltage of the first level is equal to or not equal to the absolute value of the voltage of the second level.
  • the average external voltage is 0V or close to 0V, for other components or external objects in the electronic device 100.
  • the resulting low frequency excitation will be significantly reduced.
  • the level of the first modulated signal is a square wave of 0 to 10 volts, the equivalent There is a 5V DC signal that will generate an external electric field that may cause current to flow through the body or increase external emissions or affect other devices within the electronic device 100.
  • the capacitance detecting circuit 13 reads the first signal from the sensor board 11 when the ground terminal 13a is loaded with the first level, and reads from the sensor board 11 when the ground terminal 13a is loaded with the second level. Taking a second signal, obtaining predetermined information of the target object 1 by using the read first signal and the second signal.
  • FIG. 4 is a waveform diagram of another embodiment of the first modulated signal.
  • the first modulation signal includes the first level, the second level, and a third level, and the voltage of the second level is between a voltage of a first level and a voltage of a third level
  • the first modulation signal includes a two-step square wave signal composed of a first level, a second level, and a third level.
  • the capacitance detecting circuit 13 reads a first signal from the sensor board 11 when the ground terminal 13a supplies a first level to the sensor board 11, and provides a second level to the ground terminal 13a.
  • the second signal is read from the sensor board 11, and when the ground level 13a provides a third level to the sensor board 11, the third signal is read from the sensor board 11, and
  • the fourth signal is read from the sensor board 11 through the read first signal, the second signal, the third signal and The fourth signal obtains predetermined information of the target object 1.
  • the capacitive sensing system 10 further includes a control circuit 15, the ground terminal 13a of the capacitance detecting circuit 13 is electrically connected to the control circuit 15, and the control circuit 15 is used for applying The first modulation signal is to the ground terminal 13a of the capacitance detecting circuit 13.
  • the power terminal 13b of the capacitance detecting circuit 13 is electrically connected to the control circuit 15, and the control circuit 15 is configured to control the voltage difference between the power terminal 13b and the ground terminal 13a of the capacitance detecting circuit 13 to be maintained. Consistent.
  • the control circuit 15 provides the first power signal to the ground terminal 13a, and provides a second power signal to the power terminal 13b to provide a required power voltage for the capacitor detecting circuit 13 to operate normally.
  • the control circuit 15 includes a ground terminal 15a, a power terminal 15b, a first output terminal 15c, The second output 15d.
  • the first output end 15c is connected to the ground end 13a of the capacitance detecting circuit 13 for outputting the first power signal to the ground end 13a.
  • the second output terminal 15d is connected to the power terminal 13b of the capacitance detecting circuit 13 for outputting the second power signal to the power terminal 13b.
  • the voltage of the ground terminal 15a of the control circuit 15 is 0 volts, or the system ground voltage of the electronic device 100, or a constant voltage.
  • the power terminal 15b of the control circuit 15 is for receiving a power supply voltage.
  • a communication interface (not labeled) is also provided between the control circuit 15 and the capacitance detecting circuit 13 for information communication.
  • the electronic device 100 further includes a main control chip 20 , and the main control chip 20 is connected to the ground end 15 a and the power end 15 b of the control circuit 15 for the main control.
  • Circuit 15 provides a system ground voltage and a supply voltage to power control circuit 15.
  • a communication interface (not labeled) is further disposed between the main control chip 20 and the control circuit 15 for information communication.
  • the system ground voltage is typically the voltage of the negative terminal of the power supply of the electronic device 100.
  • the power supply is a battery.
  • FIG. 5 is a schematic structural diagram of the capacitance detecting circuit 13 of FIG.
  • the capacitance detecting circuit 13 further includes a plurality of sensing units 13c and a plurality of selecting units 13d.
  • Each of the sensing units 13c is connected to the plurality of capacitive sensing plates 11a through a selection unit 13d.
  • the selecting unit 13d is configured to control the number of electrical connection between the capacitive sensing plate 11a and the sensing unit 13 when the capacitance detecting circuit 13 operates.
  • each selection unit 13d includes a switch S (not shown).
  • the switch S is respectively connected to the sensing unit 13c and at least one capacitive sensing plate 11a.
  • each of the sensing unit 13c and the connected capacitive sensing plate 11a can be selectively electrically connected through the selecting unit 13d. Thereby, the first excitation signal is simultaneously output to all of the capacitance sensing plates 11a.
  • only the part of the capacitive sensing plate 11a and the plurality of sensing units 13c are electrically connected to each other through the selecting unit 13d, and thus, after multiple selections, each The sensing unit 13c and the connected capacitive sensing plates 11a are both electrically conducted, thereby causing the first excitation signal to be divided. It is output to the plurality of capacitive sensing plates 11a.
  • each of the sensing units 13c and each of the capacitive sensing plates are controlled by the selecting unit 13d.
  • 11a is electrically connected to receive the sensing signal.
  • the sensing signals output by all of the capacitive sensing plates 11a are obtained by multiple control.
  • each sensing unit 13c may be electrically connected to a plurality of (eg, two) capacitive sensing pads 11a each time to receive a sensing signal. Accordingly, the capacitance detecting circuit 13 obtains predetermined information of the target object 1 by the received sensing signal.
  • FIG. 6 is a schematic diagram showing the circuit structure of the sensing unit 13c shown in FIG.
  • the sensing unit 13c includes an operational amplifier 131, a feedback branch 133, and a calculation unit 135.
  • the operational amplifier 131 includes an in-phase terminal a, an inverting terminal b, and an output terminal d.
  • the feedback branch 133 is connected between the inverting terminal b and the output terminal d.
  • the calculation unit 135 is connected to the output terminal d.
  • the feedback branch 133 includes a feedback capacitor Cf connected between the inverting terminal b and the output terminal d.
  • the non-inverting terminal a of the operational amplifier 131 receives a reference voltage Vref.
  • the reference voltage Vref is supplied from a reference voltage generating circuit 19. It should be noted that the reference voltage generating circuit 19 may be one circuit in the capacitance detecting system 10 or another circuit in the electronic device 100.
  • the inverting terminal b of the operational amplifier 131 is connected to the capacitive sensing plate 11a via the selection unit 13d.
  • the operational amplifier 131 is further electrically connected to the power terminal 13b and the ground terminal 13a, respectively.
  • the operational amplifier 131 When the capacitance detecting circuit 13 is in operation, the operational amplifier 131 is in a virtual short state, that is, the non-inverting terminal 13a and the inverting terminal 13b are short-circuited, and the potentials of the two are the same, that is, the potential of the non-inverting terminal a is also the reference voltage Vref. Further, the reference voltage Vref varies with the change of the first modulation signal received by the ground terminal 13a. Therefore, when the ground terminal 13a outputs the first modulation signal to the operational amplifier 131, the potentials of the in-phase terminal a and the inverting terminal b vary with the change of the first modulation signal, and accordingly, conductance with the inverting terminal b of the operational amplifier 131. The first excitation signal received by the capacitive sensing plate 11a changes as the first modulation signal changes.
  • the electricity that occurs The charge change is transmitted to the calculation unit 135 through the feedback capacitance Cf connected to the inverting terminal b.
  • the calculation unit 135 correspondingly obtains predetermined information of the target object 1 according to the charge change condition.
  • the predetermined information is calculated with the change in charge, and in other embodiments, the predetermined information can also be obtained by calculating the voltage change.
  • each of the capacitive sensing plates 11a can detect the size of a capacitor to which a finger is coupled.
  • the finger prints have ridges and valleys that are closer to the sensor plate 11 than the valleys, and thus have a larger capacitance; the valleys are further away from the sensor plate 11 than the ridges, and thus have a smaller capacitance.
  • the ridges and valleys of the fingerprint on the area corresponding to each of the capacitive sensing plates 11a can be detected.
  • the sensor boards 11 are usually designed in an array, and the center of one of the capacitive sensing plates 11a is at a distance of about 50 ⁇ m from the center of the adjacent capacitive sensing plate 11a.
  • the sensor board 11 and the capacitance detecting circuit 13 are usually implemented directly on the integrated circuit using a semiconductor process.
  • the control circuit 15 and the capacitance detecting circuit 13 are separately separated, and are respectively designed as a control chip and a capacitance detecting chip.
  • the capacitance detecting chip includes a sensor board 11 and a capacitance detecting circuit 13.
  • the finger is in the range of a few ten millimeters, such a finger, usually corresponding to a plurality of capacitive sensing plates 11a.
  • the number thereof is rather limited, for example, 160 ⁇ 64 capacitive sensing plates 11a having an area of about 8 mm ⁇ 3.2 mm.
  • the finger area is usually much larger than the area of the sensor board 11.
  • FIG. 7 is a schematic diagram of electric field line distribution between the sensor board 11 and a finger.
  • the electric field between the capacitive sensing plate 11a and the target object 1 around the sensor board 11 is different from the capacitive sensing plate 11a and the target object in the middle of the sensor board 11.
  • the present invention proposes a technical solution in which the shield electrode 17 (see FIG. 8 described later) is further provided in the capacitive sensing system 10.
  • Said The shield electrode 17 is made of a conductive material such as a metal or other conductive material.
  • the shielding electrode 17 is disposed at least around the sensing array.
  • the shield electrode 17 receives an electrical signal, but the shield electrode 17 is not used to perform a detection function, and accordingly, the shield electrode 17 does not output data.
  • FIG. 8 is a schematic structural view of the shielding electrode 17 disposed around the sensor board 11 shown in FIG.
  • FIG. 9 is a schematic view showing the electric field line distribution between the sensor board 11 and the finger 1 shown in FIG.
  • the shield electrode 17 is electrically connected to the ground terminal 13a of the capacitance detecting circuit 13 shown in FIG.
  • the shield electrode 17 receives the first power signal.
  • the voltage of the shield electrode 17 changes substantially synchronously with the voltage of the sensor 11.
  • the electric field around the sensor panel 11 is as uniform as the electric field in the middle portion, and the quality of the collected predetermined information can be improved.
  • the shielding electrode 17 may also be connected to another signal circuit (not shown) in the electronic device 100.
  • the signal circuit is provided with a ground terminal.
  • the same signal as 13a or the same signal as the sensor board 11 is given to the shield electrode 17.
  • the shield electrode 17 is an intermediate hollow electrode, and the sensor 11 plate is disposed corresponding to the hollow region of the shield electrode 17.
  • the shield electrode 17 is a closed loop electrode.
  • the shielding electrode 17 may also include a plurality of electrodes and are distributed around the sensor board 11; or, the shielding electrode 17 is a whole layer electrode or a plurality of electrodes, The sensor board 11 is laminated, and in the direction of vertical stacking, the periphery of the shield electrode 17 is beyond the periphery of the sensor board 11.
  • the shielding electrode 17 is simultaneously fabricated by using the conductive element existing in the capacitance sensing system 10 as the shielding electrode 17, or/and using the conductive material existing in the fabrication itself while utilizing the conductive material that needs to be cut off.
  • the specific description is as follows.
  • the capacitance detecting circuit 13 is integrated in a capacitance detecting circuit chip
  • the control circuit 15 is integrated in a control circuit chip.
  • the capacitance detecting circuit chip and the control circuit chip are either packaged in one integrated circuit package or separately packaged in two integrated circuit packages.
  • the package is generally described as a Quad Flat No-lead Package (QFN) and a Ball Grid Array Package (BGA).
  • QFN Quad Flat No-lead Package
  • BGA Ball Grid Array Package
  • FIG. 10 is a schematic diagram of the front part of the capacitor detecting circuit chip package structure of the QFN package.
  • 11 is a cross-sectional structural view of the capacitance detecting circuit chip package structure shown in FIG. 10 taken along line XI-XI.
  • the capacitance detecting circuit chip package structure 30 includes a heat dissipation plate 31, a wire 32, a lead frame 33, a lead frame 35, and a capacitance detecting circuit chip 37.
  • the lead frame 33 is made of a conductive material, is disposed around the capacitance detecting circuit chip 37, and is connected to the capacitance detecting circuit chip 37 via a wire 32 to transmit a signal to the capacitance detecting circuit chip 37.
  • the capacitance detecting circuit chip 37 is laminated with the heat dissipation plate 31, and the edge of the heat dissipation plate 31 is beyond the periphery of the capacitance detecting circuit chip 37 in the vertically stacked direction.
  • the heat dissipation plate 31 is made of a conductive material for heat dissipation. Further, the heat dissipation plate 31 is further used for electrical connection with the ground terminal 13a, and also serves as the shield electrode 17. Since the heat dissipation plate 31 is multiplexed as the shield electrode 17, the shield electrode 17 is not required to be additionally fabricated, so that the capacitive sensing system 10 is small in size, light in weight, and low in manufacturing cost.
  • the shield electrode 17 is formed by the same layer material from which the lead frame 33 is formed.
  • the shield electrode 17 is formed while the lead frame 33 is formed, thereby saving process, Save on materials and save costs.
  • the shield electrode 17 is located at a position between the heat dissipation plate 17 and the lead frame 33 or is disposed in cooperation with the lead frame 33 around the heat dissipation plate 31.
  • the heat dissipation plate 31 and the lead frame 33 are located in the same layer.
  • the shield electrode 17 may also be formed at the same time from the same layer material from which the heat dissipation plate 31 is formed.
  • FIG. 12 is a partial schematic diagram of a capacitor detection circuit chip package structure in a package mode of BGA.
  • the capacitance detecting circuit chip package structure 40 includes a substrate 41, a capacitance detecting circuit chip 43, and a shield electrode 17.
  • the capacitance detecting circuit chip 43 and the shield electrode 17 are disposed on the substrate 41, and preferably, the capacitance detecting circuit chip 43 and the shield electrode 17 are located on the same side of the substrate 41.
  • the shield electrode 17 is disposed around the capacitance detecting circuit chip 43.
  • the substrate 41 is, for example, a printed circuit board or a flexible circuit board.
  • the capacitance detecting system 10 includes two detection modes, a first detection mode and a second detection mode, respectively.
  • the capacitance detecting circuit 10 is configured to drive the sensor board 11 to perform the first driving signal when the grounding end 13a loads the first modulation signal, and provides a first excitation signal that changes according to the change of the first modulation signal.
  • the method further includes: when the grounding end 13a is loaded with the second modulation signal, providing a second excitation signal that varies with the change of the second modulation signal, driving the sensor board 11 to perform the second detection. a mode, wherein the first modulation signal is different from the second modulation signal, and the second excitation signal is different from the first excitation signal.
  • the first power signal supplied to the ground terminal 13a by the control circuit 15 includes the second modulation signal.
  • the capacitive sensing system 10 can perform at least two different sensing operations by performing the first and second detecting modes respectively, thereby increasing the sensing function of the capacitive sensing system 10 and enhancing Availability of the electronic device 100.
  • the second excitation signal varies with the change of the second modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
  • the second modulation signal and the second excitation signal are both voltage signals.
  • the voltage of the second excitation signal increases as the voltage of the second modulation signal increases, and the second modulation signal The voltage is lowered by a decrease, or the voltage of the second excitation signal increases as the voltage of the first power signal increases, and decreases as the voltage of the first power signal decreases.
  • the magnitude of the amplitude change of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
  • the second excitation signal and the second modulation signal are periodically varying signals.
  • the second excitation signal and the second modulation signal are either the same frequency signal, or the same frequency in-phase signal, or the same amplitude same frequency in-phase signal, or the same frequency signal, and the second excitation signal
  • the phase has a certain delay with respect to the phase of the second modulated signal, and the delay is, for example, 1 nanosecond.
  • the second modulation signal includes at least a fourth level and a fifth level, wherein the voltage of the fourth level is different from the voltage of the fifth level.
  • the inventors have found through a large number of studies that the grounding terminal 13a and the system ground of the electronic device 100, such as the grounding terminal 15a, also have a parasitic capacitance C2 (see FIG. 1), and when the grounding terminal 13a is excited, Exciting this parasitic capacitance C2, when the parasitic capacitance C2 is relatively large and the excitation frequency is relatively high, a large power consumption is generated. Through a large number of creative labor discoveries, the inventors can reduce power consumption by the following means.
  • the second detecting mode is first executed, and when the capacitive sensing system senses a predetermined operation of the target object, the first detecting mode is started or the second detecting mode is switched to The first detection mode performs a detection operation, wherein the second detection mode saves power compared to the first detection mode.
  • the second excitation signal changes according to the change of the second modulation signal, and may further reduce the charge and discharge power of the parasitic capacitance C1 between the sensor board 11 and the ground end 13a. It is used to reduce the power consumption of the capacitive sensing system 10.
  • the frequency of the second excitation signal is smaller than the frequency of the first excitation signal, and/or the voltage peak-to-peak value of the second excitation signal is smaller than the voltage peak-to-peak value of the first excitation signal, thereby achieving the purpose of reducing power consumption.
  • the frequency of the second modulation signal is smaller than the frequency of the first modulation signal, or/and the voltage peak-to-peak value of the second modulation signal is smaller than the voltage peak-to-peak value of the first modulation signal, so that power consumption can be further reduced.
  • the first detection mode is the fingerprint sensing mode
  • the second detection mode is the touch detection mode as an example.
  • the capacitance detecting circuit 13 When the capacitive sensing system 10 is In the touch detection mode, the capacitance detecting circuit 13 is configured to drive the sensor board 11 to perform a touch detection operation, sensing a touch of the target object 1 on the sensor board 11; when the capacitive sensing system 10 is in a fingerprint In the detection mode, the capacitance detecting circuit 13 is configured to drive the sensor board 11 to perform a fingerprint detecting operation to sense the fingerprint of the target object 1.
  • the capacitance detecting circuit 13 senses a touch operation by measuring a capacitance between the sensor board 11 and the target object 1.
  • detecting first performing touch detection, detecting that a touch occurs, then starting fingerprint detection or switching touch detection is Fingerprint detection to save power.
  • the capacitance detecting circuit 13 determines whether the sensor board 11 is touched
  • a second modulation signal is provided to the ground terminal 13a, and a second excitation signal is supplied to the sensor board 11 to perform touch sensing.
  • a voltage peak-to-peak value of 1 V is applied to one or both of the second modulation signal and the second excitation signal for detecting whether a touch occurs, for example,
  • the voltage peak-to-peak value of the second excitation signal is 1V
  • the voltage peak-to-peak value of the second modulation signal is 1V
  • the first modulation signal and the first excitation signal are both One or all of the voltage peaks and peaks of 10V are used for detecting the fingerprint.
  • the voltage peak-to-peak value of the first excitation signal is 10V
  • the voltage peak-to-peak value of the first modulation signal is 10V.
  • the first excitation signal and the second excitation signal are both periodically changing signals, wherein the frequency of the first excitation signal is greater than the frequency of the second excitation signal.
  • the first modulated signal and the second modulated signal are both periodically changing signals, wherein the frequency of the first modulated signal is greater than the frequency of the second modulated signal.
  • the capacitive sensing system 10 When the capacitive sensing system 10 is in the touch detection mode, only detecting whether a touch occurs does not require a high resolution like fingerprint recognition, and therefore, the plurality of capacitive sensing plates 11a or even all of the capacitive sensing plates 11a may Connect together for testing.
  • the capacitive sensing system 10 of the present invention is a sensing system that saves drive loops.
  • a capacitive sensing system includes a driving ring, a sensor board, and a capacitance detecting circuit.
  • the drive ring By applying an excitation on the drive ring, the drive ring directly contacts the finger, and the drive ring is energized to the finger to drive the finger potential to change.
  • This solution on the one hand, requires the addition of a drive ring, which increases the cost; on the other hand, the drive ring cannot apply too high voltage, such as 4V. When the voltage is too high, current flowing through the human body can cause an uncomfortable feeling.
  • the capacitive sensing system 10 of the present invention is relatively flexible in design, has better performance, lower cost, and has a higher comfort when the human body is in contact.
  • the above-mentioned technical solution of multiplexing the shielding electrode 17 by using the conductive element in the capacitive sensing system 10 is not limited to the capacitive sensing system 10 for saving the driving ring, and other suitable capacitive methods are also applicable.
  • a sensing system such as a capacitive sensing system with a driving ring
  • FIG. 13 is another schematic structural diagram of an electronic device 100 according to the present invention.
  • the electronic device 100 further includes a display device 50, a control button 60, and a housing 70.
  • the capacitive sensing system 10 is disposed in the display area of the display device 50 or disposed under the control button 60 or in the housing 70.
  • the first modulation signal may be loaded on the power supply end, and the ground end is correspondingly applied with a signal that changes according to the change of the first modulation signal, and the influence of the parasitic capacitance can also be solved.
  • the test voltage terminal loads the third power signal, and the voltage of the third power signal is between the voltage of the first power signal and the voltage of the second power signal.
  • the first modulation signal may also be applied to the reference voltage terminal, and the ground terminal is applied with a signal that changes according to the change of the first modulation signal, and the influence of the parasitic capacitance can also be solved.
  • the first modulation signal may also be loaded on some other port in the capacitance detecting circuit of the capacitive sensing system, and the ground terminal is applied with a signal that changes according to the change of the first modulation signal, and the same The effect of the parasitic capacitance can be solved.
  • the capacitance detecting circuit is defined to have a modulation end, and the modulation end is loaded with the first modulation signal which changes with time, and the modulation end is either grounded or other port. When it is another port, the voltage of the ground terminal changes correspondingly with the change of the first modulation signal.
  • the present invention further provides another capacitive sensing system and an electronic device having the capacitive sensing system.
  • the capacitive sensing system and the electronic device described herein are similar to the capacitive sensing system 10 and the electronic device 100 described above. Therefore, for the sake of simplicity, the descriptions of the capacitive sensing system and the electronic device herein are not provided.
  • the capacitive sensing system and the electronic device having the same names as those in the capacitive sensing system 10 and the electronic device 100 can be similarly referred to FIGS. 1-13.
  • the capacitive sensing system includes:
  • a sensor board for coupling to a target object in a capacitive coupling manner to perform a sensing operation
  • the capacitance detecting circuit includes a signal transmitting end and a modulation end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing Operation, the modulation end of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal changes according to a change of the first modulation signal.
  • the first excitation signal varies with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the modulation end.
  • other voltages in the capacitance detecting circuit are electrically connected to the modulation end
  • the change in pressure changes.
  • the other voltages in the capacitance detecting circuit increase as the voltage of the modulation terminal increases, and decrease as the voltage of the modulation terminal decreases.
  • the first modulation signal and the first excitation signal are voltage signals, and a voltage of the first excitation signal increases as a voltage of the first modulation signal increases, along with the first modulation The voltage of the signal is lowered and lowered.
  • the magnitude of the amplitude change of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal.
  • the first excitation signal and the first modulation signal are periodically varying signals.
  • the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and
  • the phase of the first excitation signal has a certain delay relative to the phase of the first modulated signal.
  • the capacitance detecting circuit includes a power terminal and a ground terminal, wherein the ground terminal is configured to load a first power signal, and the power terminal is configured to load a second power signal, and a voltage difference between the second power signal and the first power signal A supply voltage that operates for the capacitance sensing circuit.
  • the modulation end is one of the power terminal and the ground terminal, wherein:
  • the second power signal includes the first modulation signal, and the first power signal changes according to a change of the second power signal
  • the first power signal includes the first modulation signal
  • the voltage of the second power signal increases as the voltage of the first power signal increases, The voltage of the first power signal decreases and decreases.
  • the capacitance detecting circuit further includes a reference voltage terminal, wherein the reference voltage terminal is configured to load a third power signal, and the voltage of the third power signal is between the voltage of the second power signal and the voltage of the first power signal between.
  • the modulation end is one of the power terminal, the ground terminal, and the reference voltage terminal, wherein:
  • the second power signal includes the first modulation signal, and the first power signal and the third power signal all change according to a change of the second power signal;
  • the first power signal includes the first modulation signal, and the second power signal and the third power signal all change according to a change of the first power signal;
  • the third power signal includes the first modulation signal, and the first power signal and the second power signal all change according to the change of the third power signal.
  • the first modulated signal includes at least a first level and a second level, the voltage of the first level being different from the voltage of the second level.
  • the capacitive sensing system is further configured to load at the modulation end, in addition to providing a first excitation signal to drive the sensor board to perform a first detection mode when the modulation end is loaded with the first modulation signal,
  • the second excitation signal is provided to drive the sensor board to perform a second detection mode, wherein the first modulation signal is different from the second modulation signal, and the first excitation signal is different from the second excitation signal.
  • the second excitation signal varies with the change of the second modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
  • the second modulation signal and the second excitation signal are voltage signals, and a voltage of the second excitation signal increases as a voltage of the second modulation signal increases, and the second modulation The voltage of the signal is lowered and lowered.
  • the magnitude of the amplitude change of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
  • the second excitation signal and the second modulation signal are periodically varying signals.
  • the second excitation signal and the second modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and
  • the phase of the second excitation signal has a certain delay relative to the phase of the second modulation signal.
  • one of the first detection mode and the second detection mode is a fingerprint detection mode
  • the other is a touch detection mode
  • the capacitance detecting circuit when the capacitive sensing system is in touch detection In the mode, the capacitance detecting circuit is configured to drive the sensor board to perform a touch detecting operation, and sense whether a target object performs the sensor board Touching; when the capacitive sensing system is in the fingerprint detecting mode, the capacitance detecting circuit is configured to drive the sensor board to perform a fingerprint detecting operation, and sense whether the fingerprint of the target object is a preset fingerprint.
  • the capacitance detecting circuit is configured to perform self-capacitance detection on the sensor board.
  • the second modulation signal includes a fourth level and a fifth level, the voltage of the fourth level being different from the voltage of the fifth level.
  • the first modulated signal and the second modulated signal are both periodically varying signals, wherein the frequency of the first modulated signal is greater than the frequency of the second modulated signal.
  • the first excitation signal and the second excitation signal are both periodically varying signals, wherein the frequency of the first excitation signal is greater than the frequency of the second excitation signal.
  • the voltage peak-to-peak value of the first level and the second level of the first modulation signal is greater than the voltage peak-to-peak value of the fourth level and the fifth level of the second modulation signal.
  • the voltage peak-to-peak value of the first excitation signal is greater than the voltage peak-to-peak value of the second excitation signal.
  • the capacitance detecting circuit senses a touch operation by measuring a capacitance between the sensor board and the target object, and the capacitance detecting circuit determines whether the sensor board is touched;
  • switching provides a second modulated signal to the ground, and provides a second excitation signal as a first excitation signal to the sensor board to perform fingerprint sensing;
  • the touch sensing can be performed first, and then whether the fingerprint sensing is performed according to whether there is a touch operation, thereby saving power consumption.
  • the capacitive sensing system further includes a control circuit, and the control circuit is respectively connected to the power terminal and the ground terminal, and is configured to provide the second power signal to the power terminal to provide a first Power signal.
  • the capacitive sensing system is a fingerprint sensing system that saves a drive loop.
  • the sensor board includes a plurality of capacitive sensing plates, and the capacitance detecting circuit performs a sensing operation by measuring a capacitance between the plurality of capacitive sensing plates and a target object to obtain a predetermined target object. information.
  • the predetermined information includes biometric information and/or touch operation information.
  • the biometric information includes a fingerprint and a palm print.
  • the touch operation information is operation information of whether the sensor board is approached or touched.
  • the capacitive sensing system further comprises a shielding electrode, the shielding electrode being disposed at least around the sensor board.
  • the shield electrode is electrically connected to the modulation end, and the shield electrode receives the first power signal.
  • the capacitive sensing system further includes a heat dissipation plate for dissipating heat from the capacitive sensing system, and the heat dissipation plate is also used as the shielding electrode.
  • the modulation terminal is not limited to the ground terminal 13a, but also may be the power terminal 13b and the reference voltage terminal. Or other ports.
  • the capacitive sensing system described herein may be the same as or different from the capacitive sensing system 10 described above.
  • FIG. 14 is a flow chart of a method for detecting a capacitive sensing system according to the present invention.
  • the detection method is applicable to the capacitive sensing system described in the above embodiments. However, other suitable types of capacitive sensing systems are also applicable, and the present invention is not specifically limited.
  • the capacitive sensing system includes a plurality of capacitive sensing plates and a capacitance detecting circuit, and the capacitance detecting circuit includes a modulation end, and the detecting method includes:
  • S1 providing a first excitation signal to the plurality of capacitive sensing plates, and driving the plurality of capacitive sensing plates to perform a sensing operation;
  • the plurality of capacitive sensing plates are used to capacitively couple to a target object, and perform sensing operations to obtain predetermined information of the target object.
  • the first excitation signal varies with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the plurality of capacitive sensing plates and the modulation end.
  • the first modulation signal and the first excitation signal are voltage signals, and a voltage of the first excitation signal increases as a voltage of the first modulation signal increases, along with the first modulation The voltage of the signal is lowered and lowered.
  • the magnitude of the amplitude change of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal.
  • the first excitation signal and the first modulation signal are periodically varying signals.
  • the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and
  • the phase of the first excitation signal has a certain delay relative to the phase of the first modulated signal.
  • the detecting method further includes:
  • a second modulated signal is provided to the modulation terminal, wherein the second excitation signal changes as the second modulation signal changes.
  • the second excitation signal is different from the first excitation signal
  • the second modulation signal is different from the first modulation signal.
  • the capacitive sensing system is driven to perform two different detection modes, a first detection mode and a second detection mode, respectively.
  • the first detection mode provides a first excitation signal to the plurality of capacitive sensing plates, and provides a first modulation signal to the modulation end; and the second detection mode provides a second excitation signal to the plurality of The capacitive sensing plate provides a second modulated signal to the modulation terminal. Accordingly, the capacitive sensing system is caused to increase the sensing function.
  • the second excitation signal varies with the change of the second modulation signal to reduce the charge and discharge power of the parasitic capacitance between the plurality of capacitive sensing plates and the modulation end.
  • the second modulation signal and the second excitation signal are voltage signals, and a voltage of the second excitation signal increases as a voltage of the second modulation signal increases, and the second modulation The voltage of the signal is lowered and lowered.
  • the magnitude of the amplitude change of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
  • the second excitation signal and the second modulation signal are periodically changed signal.
  • the second excitation signal and the second modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and
  • the phase of the second excitation signal has a certain delay relative to the phase of the second modulation signal.
  • the second detection mode saves power compared to the first detection mode, and when detecting, first drives the capacitive sensing system to perform a second detection mode, and in the second detection mode, after sensing a predetermined operation of the target object And then restarting the first detection mode or switching the second detection mode to the first detection mode, thereby saving power.
  • the frequency of the first modulated signal is greater than the frequency of the second modulated signal
  • the voltage peak-to-peak value of the first modulation signal is greater than the voltage peak-to-peak value of the second modulation signal.
  • the detecting method provides a first excitation signal to the plurality of capacitive sensing plates for driving the plurality of capacitive sensing plates to perform a fingerprint sensing operation; providing a second excitation signal to the plurality of And a capacitive sensing plate for driving the plurality of capacitive sensing plates to perform a touch operation.
  • the detecting method senses a touch operation of the target object by measuring a capacitance between the plurality of capacitive sensing plates and the target object, and determines whether the plurality of capacitive sensing plates are touched by the target object. ;
  • the voltage peak-to-peak value of the first excitation signal is 10V, and the frequency is 1 MHz.
  • the voltage peak-to-peak value of the first modulation signal is 10V, and the frequency is 1 MHz; relatively, the voltage peak of the second excitation signal The peak value is 1V and the frequency is 100KHz.
  • the voltage peak-to-peak value of the second modulation signal is 1V and the frequency is 100KHz.
  • the capacitive sensing system further includes a shielding electrode, and the shielding electrode is disposed at least on a periphery of the plurality of capacitive sensing plates.
  • the detecting method further comprises:
  • the detecting method senses predetermined information of the target object by measuring capacitance between the plurality of capacitive sensing plates and the target object.
  • the predetermined information includes biometric information and/or touch operation information of the target object.
  • the biometric information is fingerprint information.
  • the touch operation information is whether a target object approaches or touches the plurality of capacitive sensing plates.
  • the detecting method senses predetermined information of the target object by measuring self-capacitance between the plurality of capacitive sensing plates and the target object.
  • the capacitance detecting circuit includes a ground end and a power end, and the detecting method further includes:
  • the modulation end is one of the power terminal and the ground terminal, wherein:
  • the second power signal includes the first modulation signal, and a voltage of the first power signal increases as a voltage of the second power signal increases Decreasing as the voltage of the second power signal decreases;
  • the first power signal includes the first modulation signal
  • the voltage of the second power signal increases as the voltage of the first power signal increases, The voltage of the first power signal decreases and decreases.
  • the capacitance detecting circuit further includes a reference voltage terminal, and the detecting method further include:
  • a voltage of the third power signal is between a voltage of the second power signal and a voltage of the first power signal.
  • the modulation end is one of the power terminal, the ground terminal, and the reference voltage terminal:
  • the second power signal includes the first modulation signal, and voltages of the first power signal and the third power signal are all related to a voltage of the second power signal Raising and rising, decreasing as the voltage of the second power signal decreases;
  • the first power signal includes the first modulation signal
  • the voltages of the second power signal and the third power signal are all related to a voltage of the first power signal Raising and rising, decreasing as the voltage of the first power signal decreases;
  • the third power signal includes the first modulation signal, and the voltages of the first power signal and the second power signal are all related to the voltage of the third power signal The rise is increased and decreases as the voltage of the third power signal decreases.
  • the modulation end is a ground terminal.
  • the above detection method of the present invention can make the equivalent capacitance of the parasitic capacitance between the modulation end and the plurality of capacitance sensing plates smaller, thereby improving the sensing accuracy.
  • touch sensing it is determined whether or not fingerprint sensing is performed, so that the power consumption of the capacitive sensing system can be further reduced.

Abstract

Disclosed in the present invention are a capacitive sensing system, an electronic device, and a detection method for the capacitive sensing system. The capacitive sensing system comprises a sensor plate and a capacitance detection circuit. The sensor plate is used for capacitively coupling to a target object to execute a sensing operation. The capacitance detection circuit comprises a signal transmission end and a ground end, the capacitance detection circuit being used for providing a first excitation signal to the sensor plate by means of the signal transmission end to drive the sensor plate to execute a sensing operation, and the ground end of the capacitance detection circuit being used for loading a first modulation signal, the first excitation signal changing according to changes in the first modulation signal. The present technical solution improves the sensing precision of the electronic device.

Description

电子设备及其电容式感测***、以及电容式感测***的检测方法Electronic device and its capacitive sensing system, and detection method of capacitive sensing system
本申请要求2015年1月13日提交中国专利局、申请号为201510015704.0、发明名称为“电子设备及其电容式感测***、以及电容式感测***的检测方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims priority from Chinese Patent Application filed on Jan. 13, 2015, to the Chinese Patent Office, Application No. 201510015704.0, entitled "Electronic Device and Its Capacitive Sensing System, and Capacitive Sensing System" The entire content of which is incorporated herein by reference.
技术领域Technical field
本发明涉及一种电容式感测***、具有所述电容式感测***的电子设备、以及一种电容式感测***的检测方法，尤其涉及一种指纹感测***、具有所述指纹感测***的电子设备、以及一种指纹感测***的检测方法。The present invention relates to a capacitive sensing system, an electronic device having the capacitive sensing system, and a method for detecting a capacitive sensing system, and more particularly to a fingerprint sensing system having the fingerprint sensing The electronic device of the system and a detection method of the fingerprint sensing system.
背景技术Background technique
目前，越来越多的电子设备(如：手机、平板电脑等)都会设置有一种或多种感测***，如用于感测触摸操作的触摸感测***、用于感测人体生物特征的生物特征感测***等，所述生物特征包括指纹、掌纹等，而触摸感测***以及生物特征感测***多以电容式感测***来执行感测操作。At present, more and more electronic devices (such as mobile phones, tablets, etc.) are provided with one or more sensing systems, such as a touch sensing system for sensing touch operations, for sensing human biometrics. The biometric sensing system or the like includes fingerprints, palm prints, and the like, and the touch sensing system and the biometric sensing system mostly perform sensing operations with a capacitive sensing system.
所述电容式感测***通常包括传感器板以及电容检测电路，所述传感器板用于以电容耦合方式耦合到目标物体，所述目标物体如为用户的手指。所述电容检测电路为所述传感器板提供驱动信号，并接收来自传感器板输出的感测信号，进而实现感测目标物体的预定信息。所述预定信息如为生物特征信息、触摸信息等。The capacitive sensing system typically includes a sensor board for capacitively coupling to a target object, and a capacitance detecting circuit, such as a user's finger. The capacitance detecting circuit provides a driving signal to the sensor board and receives a sensing signal from the output of the sensor board, thereby implementing predetermined information for sensing the target object. The predetermined information is biometric information, touch information, or the like.
所述电容检测电路通常包括电源端、接地端、和信号传输端。所述电源端与接地端用于接收电源电压，以保证所述电容检测电路正常工作。所述信号传输端为不同于所述电源端与接地端的第三端，所述信号传输端用于传输所述电容检测电路与所述传感器板之间的信号，如所述驱动信号、感测信号。 The capacitance detecting circuit generally includes a power terminal, a ground terminal, and a signal transmission terminal. The power terminal and the ground terminal are configured to receive a power supply voltage to ensure that the capacitance detecting circuit works normally. The signal transmission end is a third end different from the power end and the ground end, and the signal transmission end is configured to transmit a signal between the capacitance detecting circuit and the sensor board, such as the driving signal and the sensing signal.
然，所述传感器板与所述接地端之间存在寄生电容，此寄生电容是与目标物体和传感器板之间的电容相叠加的，如果目标物体和传感器板之间的电容过小，则所述感测信号的质量太差而无法检测，从而影响感测精度。However, there is a parasitic capacitance between the sensor board and the ground, and the parasitic capacitance is superposed on the capacitance between the target object and the sensor board. If the capacitance between the target object and the sensor board is too small, then The quality of the sensing signal is too poor to be detected, thereby affecting the sensing accuracy.
发明内容Summary of the invention
为解决上述技术问题，本发明提供一种感测精度较高的电容式感测***、具有所述电容式感测***的电子设备、以及一种电容式感测***的检测方法。To solve the above technical problem, the present invention provides a capacitive sensing system with high sensing accuracy, an electronic device having the capacitive sensing system, and a detecting method of the capacitive sensing system.
为实现上述目的，本发明提供如下技术方案：To achieve the above object, the present invention provides the following technical solutions:
一种电容式感测***，包括：A capacitive sensing system comprising:
传感器板，用于以电容方式耦合到目标物体来执行感测操作；a sensor board for capacitively coupling to a target object to perform a sensing operation;
电容检测电路，所述电容检测电路包括信号传输端和接地端，所述电容检测电路用于通过所述信号传输端提供第一激励信号给所述传感器板，以驱动所述传感器板执行感测操作，所述电容检测电路的接地端用于加载第一调制信号，所述第一激励信号随所述第一调制信号的变化而变化。a capacitance detecting circuit, the capacitance detecting circuit includes a signal transmitting end and a ground end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing In operation, the ground of the capacitance detecting circuit is used to load a first modulation signal, and the first excitation signal changes as the first modulation signal changes.
优选地，所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述传感器板与所述接地端之间寄生电容的充放电电量。Preferably, the first excitation signal changes with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
优选地，所述第一调制信号与所述第一激励信号为电压信号，所述第一激励信号的电压随所述第一调制信号的电压的升高而升高、随所述第一调制信号的电压的降低而降低。Preferably, the first modulation signal and the first excitation signal are voltage signals, and a voltage of the first excitation signal increases as a voltage of the first modulation signal increases, along with the first modulation The voltage of the signal is lowered and lowered.
本发明进一步提供一种电子设备，包括电容式感测***。所述电容式感测***包括：The invention further provides an electronic device comprising a capacitive sensing system. The capacitive sensing system includes:
传感器板，用于以电容方式耦合到目标物体来执行感测操作；a sensor board for capacitively coupling to a target object to perform a sensing operation;
电容检测电路，所述电容检测电路包括信号传输端和接地端，所述电容检测电路用于通过所述信号传输端提供第一激励信号给所述传感器板，以驱动所述传感器板执行感测操作，所述电容检测电路的接地端用于加载第一调制信号，所述第一激励信号随所述第一调制信 号的变化而变化。a capacitance detecting circuit, the capacitance detecting circuit includes a signal transmitting end and a ground end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing Operating, the ground of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal is associated with the first modulation signal The number changes and changes.
本发明又提供一种电容式感测***，包括：The invention further provides a capacitive sensing system comprising:
传感器板，用于以电容耦合方式耦合到目标物体来执行感测操作；a sensor board for coupling to a target object in a capacitive coupling manner to perform a sensing operation;
电容检测电路，所述电容检测电路包括信号传输端和调制端，所述电容检测电路用于通过所述信号传输端提供第一激励信号给所述传感器板，以驱动所述传感器板执行感测操作，所述电容检测电路的调制端用于加载第一调制信号，所述第一激励信号随所述第一调制信号的变化而变化。a capacitance detecting circuit, the capacitance detecting circuit includes a signal transmitting end and a modulation end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing Operation, the modulation end of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal changes according to a change of the first modulation signal.
优选地，所述电容检测电路中的电压均随所述调制端的电压的变化而变化。Preferably, the voltage in the capacitance detecting circuit varies with the voltage of the modulation terminal.
优选地，所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述传感器板与所述接地端之间寄生电容的充放电电量。Preferably, the first excitation signal changes with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
优选地，所述第一调制信号与所述第一激励信号为电压信号，所述第一激励信号的电压随所述第一调制信号的电压的升高而升高、随所述第一调制信号的电压的降低而降低。Preferably, the first modulation signal and the first excitation signal are voltage signals, and a voltage of the first excitation signal increases as a voltage of the first modulation signal increases, along with the first modulation The voltage of the signal is lowered and lowered.
本发明又提供一种电子设备，，包括电容式感测***。所述电容式感测***包括：The invention further provides an electronic device comprising a capacitive sensing system. The capacitive sensing system includes:
传感器板，用于以电容耦合方式耦合到目标物体来执行感测操作；a sensor board for coupling to a target object in a capacitive coupling manner to perform a sensing operation;
电容检测电路，所述电容检测电路包括信号传输端和调制端，所述电容检测电路用于通过所述信号传输端提供第一激励信号给所述传感器板，以驱动所述传感器板执行感测操作，所述电容检测电路的调制端用于加载第一调制信号，所述第一激励信号随所述第一调制信号的变化而变化。a capacitance detecting circuit, the capacitance detecting circuit includes a signal transmitting end and a modulation end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing Operation, the modulation end of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal changes according to a change of the first modulation signal.
本发明还提供一种电容式感测***的检测方法，所述电容式感测***包括多个电容感测极板和电容检测电路，所述电容检测电路包括调制端，所述检测方法包括：The present invention also provides a method for detecting a capacitive sensing system, the capacitive sensing system comprising a plurality of capacitive sensing plates and a capacitance detecting circuit, the capacitance detecting circuit comprising a modulation end, the detecting method comprising:
提供第一激励信号给所述多个电容感测极板，驱动所述多个电容 感测极板执行感测操作；Providing a first excitation signal to the plurality of capacitive sensing plates, driving the plurality of capacitors The sensing plate performs a sensing operation;
提供第一调制信号给所述调制端；Providing a first modulated signal to the modulation end;
其中，所述第一激励信号随所述第一调制信号的变化而变化。Wherein the first excitation signal changes as the first modulation signal changes.
优选地，所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述多个电容感测极板与所述调制端之间寄生电容的充放电电量。Preferably, the first excitation signal varies with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the plurality of capacitive sensing plates and the modulation end.
优选地，所述电容检测电路中的电压均随所述第一调制信号的电压的升高而升高、随第一调制信号的电压的降低而降低。Preferably, the voltage in the capacitance detecting circuit increases as the voltage of the first modulation signal increases, and decreases as the voltage of the first modulation signal decreases.
本发明上述电容式感测***、电子设备、检测方法通过提供第一调制信号，第一激励信号随第一调制信号的变化而变化，从而提高感测精度较高。The above capacitive sensing system, electronic device and detecting method of the present invention change the first excitation signal according to the change of the first modulation signal by providing the first modulation signal, thereby improving the sensing precision.
附图说明DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.
图1为本发明电子设备较佳实施方式的方框结构示意图。1 is a block diagram showing the structure of an electronic device according to a preferred embodiment of the present invention.
图2为图1所示传感器板的一实施方式的结构示意图。FIG. 2 is a schematic structural view of an embodiment of the sensor board shown in FIG. 1. FIG.
图3为第一激励信号与第一调制信号的波形示意图。3 is a waveform diagram of a first excitation signal and a first modulation signal.
图4为所述第一调制信号的另一实施方式的波形图。4 is a waveform diagram of another embodiment of the first modulated signal.
图5为图1所示电容检测电路的结构示意图。FIG. 5 is a schematic structural view of the capacitance detecting circuit shown in FIG. 1.
图6为图5所示感测单元的电路结构示意图。FIG. 6 is a schematic diagram showing the circuit structure of the sensing unit shown in FIG. 5.
图7为所述传感器板与手指之间的电场线分布示意图。Fig. 7 is a schematic view showing the distribution of electric field lines between the sensor board and the finger.
图8为在图2所示的传感器板周围区域设置屏蔽电极的结构示意图。Fig. 8 is a structural schematic view showing the arrangement of shield electrodes in the area around the sensor board shown in Fig. 2.
图9为图8所示传感器板与手指之间的电场线分布示意图。FIG. 9 is a schematic view showing the electric field line distribution between the sensor board and the finger shown in FIG. 8.
图10为封装方式为QFN的电容检测电路芯片封装结构的正面部分示意图。 FIG. 10 is a front view showing a package structure of a capacitance detecting circuit chip packaged in a QFN manner.
图11为图10所示电容检测电路芯片封装结构沿XI-XI线的剖面结构示意图。11 is a cross-sectional structural view of the capacitance detecting circuit chip package structure shown in FIG. 10 taken along line XI-XI.
图12为封装方式为BGA的电容检测电路芯片封装结构的正面部分示意图。FIG. 12 is a front view showing a package structure of a capacitance detecting circuit chip packaged in a BGA mode.
图13为本发明电子设备的另一结构示意图。FIG. 13 is another schematic structural diagram of an electronic device according to the present invention.
图14为本发明电容式感测***的检测方法流程图。14 is a flow chart of a method for detecting a capacitive sensing system of the present invention.
具体实施方式detailed description
正如背景技术所述，现有的电子设备的电容式感测***的感测精度较低，而影响所述电容式感测***的感测精度较低的因素较多，经发明人的大量研究发现：所述电容检测电路的接地端与所述传感器板之间存在寄生电容，且所述接地端通常加载一恒定电压信号，而传感器板上加载不断变化的电压信号，从而使得所述寄生电容存在充放电，相应地，所述电容检测电路检测到的电荷不仅包括目标物体与传感器板之间构成的电容由于电压变化引起的电荷，还包括所述寄生电容由于电压的变化引起的电荷，进而影响感测精度。As described in the background art, the sensing accuracy of the capacitive sensing system of the existing electronic device is relatively low, and the factors affecting the sensing accuracy of the capacitive sensing system are relatively low, and a large amount of research by the inventors It is found that there is a parasitic capacitance between the ground terminal of the capacitance detecting circuit and the sensor board, and the ground terminal is usually loaded with a constant voltage signal, and the sensor board is loaded with a constantly changing voltage signal, so that the parasitic capacitance There is charge and discharge. Correspondingly, the electric charge detected by the capacitance detecting circuit includes not only the electric charge caused by the voltage change between the target object and the sensor plate but also the electric charge caused by the change of the parasitic capacitance. Affects sensing accuracy.
基于上述研究，为解决所述电容式感测***的感测精度较低的问题，发明人通过大量的创造性劳动，对应提出感测精度较高的电容式感测***以及具有所述电容式感测***的电子设备。其中，所述电容式感测***或为触摸感测***、或为生物特征感测***、或为多功能感测***、或为其它合适类型的感测***，所述多功能感测***例如为既可执行触摸感测功能又可执行生物特征感测功能的***。进一步地，所述生物特征感测***为指纹、掌纹等感测***或其它合适类型的生物特征感测***。Based on the above research, in order to solve the problem that the sensing accuracy of the capacitive sensing system is low, the inventor correspondingly proposes a capacitive sensing system with high sensing accuracy and has the capacitive feeling through a large amount of creative labor. Measuring the electronic equipment of the system. Wherein the capacitive sensing system is either a touch sensing system, or a biometric sensing system, or a multi-function sensing system, or other suitable type of sensing system, such as a multi-functional sensing system, for example A system that can perform both a touch sensing function and a biometric sensing function. Further, the biometric sensing system is a sensing system such as a fingerprint, a palm print, or other suitable type of biometric sensing system.
进一步地，在本发明的描述中，需要理解的是，“多个”的含义是两个或两个以上，除非另有明确具体的限定。Further, in the description of the present invention, it is to be understood that the meaning of "a plurality" is two or more unless specifically defined otherwise.
下述实施例中第一调制信号为用于生物特征感测时的调制信号，第二调制信号为用于检测是否有触摸操作时的调制信号，但是，可以理解地，也可将用于生物特征感测时的调制信号命名为第二调制信 号，将用于检测是否有触摸操作时的调制信号命名为第一调制信号，因此，本文并不局限将名称“第一调制信号”仅限于为用于生物特征感测时的调制信号，将名称“第二调制信号”为用于检测是否有触摸操作时的调制信号。类似地，第一电源信号、第二电源信号的名称也可互换。In the following embodiments, the first modulation signal is a modulation signal used for biometric sensing, and the second modulation signal is a modulation signal for detecting whether there is a touch operation, but, understandably, it can also be used for biological The modulation signal during feature sensing is named as the second modulation signal. No., the modulation signal used to detect whether there is a touch operation is named as the first modulation signal. Therefore, this document does not limit the name "first modulation signal" to the modulation signal used for biometric sensing. The name "second modulation signal" is a modulation signal for detecting whether there is a touch operation. Similarly, the names of the first power signal and the second power signal are also interchangeable.
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。请参考图1，图1为本发明电子设备较佳实施方式的方框结构示意图。所述电子设备100如为手机、平板电脑、GPS导航***、电视等设备。所述电子设备100包括电容式感测***10。所述电容式感测***10用于感测目标物体1的预定信息，并根据感测到预定信息确定是否执行相应的功能。所述预定信息包括生物特征信息或/和触摸信息。所述生物特征信息包括指纹信息。所述触摸信息为是否有目标物体接近或触摸所述电容式感测***10。所述目标物体1可以为手指、也可以为用户身体的其它部分，如脚趾等，甚至也可以为其它合适类型的物体，而并不限于人体。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. Please refer to FIG. 1. FIG. 1 is a block diagram of a preferred embodiment of an electronic device according to the present invention. The electronic device 100 is, for example, a mobile phone, a tablet computer, a GPS navigation system, a television, and the like. The electronic device 100 includes a capacitive sensing system 10. The capacitive sensing system 10 is configured to sense predetermined information of the target object 1 and determine whether to perform a corresponding function according to the sensed predetermined information. The predetermined information includes biometric information or/and touch information. The biometric information includes fingerprint information. The touch information is whether a target object approaches or touches the capacitive sensing system 10. The target object 1 may be a finger, or may be other parts of the user's body, such as a toe, etc., or even other suitable types of objects, and is not limited to the human body.
以所述电容式感测***10为指纹感测***为例，所述指纹感测***用于感测指纹信息，若感测到的指纹信息与预先存储的指纹信息一致，则对应执行开机、解锁、支付、直接调用预定应用程序等功能；若感测到的指纹信息与预先存储的指纹信息不一致，则不执行所述功能。所述预定应用程序如为微博、微信等，且在所述电子设备100处于待机、锁屏等状态下均可以直接调用所述预定应用程序。Taking the capacitive sensing system 10 as an example, the fingerprint sensing system is configured to sense fingerprint information. If the sensed fingerprint information is consistent with the pre-stored fingerprint information, the booting is performed correspondingly. The functions of unlocking, paying, and directly calling a predetermined application; if the sensed fingerprint information is inconsistent with the pre-stored fingerprint information, the function is not performed. The predetermined application program is, for example, Weibo, WeChat, etc., and the predetermined application program can be directly invoked when the electronic device 100 is in a standby state, a lock screen, or the like.
再或者，以所述电容式感测***10为触摸感测***为例，所述触摸感测***用于感测触摸操作，若感测到目标物体1的触摸或接近，则对应执行触发功能，如触发电子设备100内的一预定装置开始工作或者是开始执行另一工作。Or, taking the capacitive sensing system 10 as an example of a touch sensing system, the touch sensing system is configured to sense a touch operation, and if a touch or proximity of the target object 1 is sensed, a trigger function is performed correspondingly. For example, a predetermined device in the trigger electronic device 100 starts to work or starts to perform another job.
又或者，以所述电容式感测***10为兼具触摸感测与指纹感测 两种功能的***为例，所述电容式感测***10首先执行触摸感测功能，当感测到触摸操作后，则切换执行触摸感测功能为指纹感测功能，感测目标物体1的指纹，如感测到的指纹与预设的指纹一致，则对应执行相应的功能。在指纹感测正确之后或在多次检测指纹不成功之后，所述电容式感测***10再切换为触摸感测功能，从而达到节省电能的效果。Or alternatively, the capacitive sensing system 10 is combined with touch sensing and fingerprint sensing. For example, the capacitive sensing system 10 first performs a touch sensing function. When the touch operation is sensed, the touch sensing function is switched to perform a fingerprint sensing function, and the target object 1 is sensed. The fingerprint, if the sensed fingerprint is consistent with the preset fingerprint, performs corresponding functions correspondingly. After the fingerprint sensing is correct or after the fingerprint detection is unsuccessful, the capacitive sensing system 10 switches to the touch sensing function to achieve the effect of saving power.
所述电容式感测***10包括传感器板11和电容检测电路13。所述传感器板11用于以电容方式耦合到目标物体1来执行感测操作。所述电容检测电路13包括信号传输端T和接地端13a。所述电容检测电路13用于通过所述信号传输端T提供第一激励信号给所述传感器板11，以驱动所述传感器11板执行感测操作，从而获得所述目标物体1的预定信息。所述电容检测电路13的接地端13a用于加载第一调制信号，所述第一激励信号随所述第一调制信号的变化而变化。The capacitive sensing system 10 includes a sensor board 11 and a capacitance detecting circuit 13. The sensor board 11 is for capacitively coupling to the target object 1 to perform a sensing operation. The capacitance detecting circuit 13 includes a signal transmitting terminal T and a ground terminal 13a. The capacitance detecting circuit 13 is configured to provide a first excitation signal to the sensor board 11 through the signal transmitting end T to drive the sensor 11 board to perform a sensing operation, thereby obtaining predetermined information of the target object 1. The ground terminal 13a of the capacitance detecting circuit 13 is for loading a first modulation signal, and the first excitation signal changes as the first modulation signal changes.
所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述传感器板与所述接地端之间寄生电容的充放电电量。The first excitation signal varies with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
由于所述接地端13a加载第一调制信号，所述第一激励信号随所述第一调制信号的变化而变化，从而减小所述接地端13a与所述传感器板11之间的寄生电容C1的充放电电量。进而，所述寄生电容C1对所述传感器板11与目标物体1之间的电容的叠加效果减小，可以提高感测精度。Since the ground terminal 13a loads the first modulation signal, the first excitation signal changes with the change of the first modulation signal, thereby reducing the parasitic capacitance C1 between the ground terminal 13a and the sensor board 11. Charge and discharge. Further, the effect of the parasitic capacitance C1 on the superposition of the capacitance between the sensor board 11 and the target object 1 is reduced, and the sensing accuracy can be improved.
所述第一调制信号与所述第一激励信号为电压信号。优选地，所述第一激励信号的电压随所述第一调制信号的电压的升高而升高、随所述第一调制信号的电压的降低而降低。The first modulation signal and the first excitation signal are voltage signals. Preferably, the voltage of the first excitation signal increases as the voltage of the first modulation signal increases, and decreases as the voltage of the first modulation signal decreases.
更优选地，所述第一激励信号的幅度变化大小与所述第一调制信号的幅度变化大小对应相同。从而，使得所述接地端13a与所述传感器板11之间的寄生电容C1的充放电电量为0，相应地，所述寄生电容C1等效为0。进而，所述寄生电容C1对所述传感器板11与目标物体1之间的电容的叠加效果消除，从而可进一步提高感测精度。More preferably, the magnitude of the amplitude change of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal. Therefore, the charge and discharge electric quantity of the parasitic capacitance C1 between the ground end 13a and the sensor board 11 is made zero, and accordingly, the parasitic capacitance C1 is equivalent to zero. Further, the superimposing effect of the parasitic capacitance C1 on the capacitance between the sensor board 11 and the target object 1 is eliminated, so that the sensing accuracy can be further improved.
在本实施例中，所述第一激励信号与所述第一调制信号为周期性 变化的信号。然，本发明并不限制所述第一激励信号与所述第一调制信号为周期性变化的信号，在其它实施例中，所述第一激励信号与所述第一调制信号也可为非周期性变化的信号，只要二者同步变化，能够减小接地端13a与传感器板11之间的寄生电容的充放电电量即可。In this embodiment, the first excitation signal and the first modulation signal are periodic The signal of change. However, the present invention does not limit the first excitation signal and the first modulation signal to periodically change signals. In other embodiments, the first excitation signal and the first modulation signal may also be non- The periodically changing signal can be reduced in charge and discharge amount of the parasitic capacitance between the ground terminal 13a and the sensor plate 11 as long as the two are synchronously changed.
优选地，所述第一激励信号与所述第一调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第一激励信号的相位相对第一调制信号的相位具有一定的延迟，延迟如为1纳秒。Preferably, the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and the The phase of an excitation signal has a certain delay with respect to the phase of the first modulated signal, and the delay is, for example, 1 nanosecond.
在本实施例中，所述电容检测电路13通过量测传感器板11与目标物体1之间的电容，来检测目标物体1的预定信息。优选地，所述电容检测电路13通过所述接地端13a加载所述第一调制信号，并提供随所述第一调制信号变化而变化的第一激励信号对所述传感器板11进行自电容检测，以实现感测操作。In the present embodiment, the capacitance detecting circuit 13 detects predetermined information of the target object 1 by measuring the capacitance between the sensor board 11 and the target object 1. Preferably, the capacitance detecting circuit 13 loads the first modulation signal through the ground terminal 13a, and provides a first excitation signal that changes according to the change of the first modulation signal to perform self-capacitance detection on the sensor board 11. To achieve the sensing operation.
请参阅图2，图2为图1所示传感器板11的一实施方式的结构示意图。所述传感器板11包括多个电容感测极板11a。在本实施例中，所述多个电容感测极板11a为矩形，然，所述多个电容感测极板11a的形状并不局限于此，在其它实施方式中，所述多个电容感测极板11a也可为其它规则或不规则形状。优选地，所述多个电容感测极板11a排列成感应阵列，用于执行感测操作。需要说明的是，所述多个电容感测极板11a可以成规则阵列排列，如方阵，也可以成非规则排列。Please refer to FIG. 2. FIG. 2 is a schematic structural view of an embodiment of the sensor board 11 shown in FIG. The sensor board 11 includes a plurality of capacitive sensing pads 11a. In this embodiment, the plurality of capacitive sensing plates 11a are rectangular. However, the shape of the plurality of capacitive sensing plates 11a is not limited thereto. In other embodiments, the plurality of capacitors The sensing plate 11a can also be of other regular or irregular shapes. Preferably, the plurality of capacitive sensing pads 11a are arranged in an array of sensing for performing sensing operations. It should be noted that the plurality of capacitive sensing plates 11a may be arranged in a regular array, such as a square matrix, or may be arranged in an irregular manner.
优选地，每一电容感测极板11a形成一自电容。当目标物体1触摸或接近所述电容感测极板11a时，所述电容感测极板11a附近的电场改变，相应地，所述电容感测极板11a的自电容改变。自电容检测即是检测电容感测极板11a由于目标物体1(例如指纹)的输入而导致的自电容变化。Preferably, each of the capacitive sensing plates 11a forms a self-capacitance. When the target object 1 touches or approaches the capacitive sensing plate 11a, the electric field in the vicinity of the capacitive sensing plate 11a changes, and accordingly, the self-capacitance of the capacitive sensing plate 11a changes. The self-capacitance detection is to detect a change in self-capacitance caused by the input of the capacitive sensing plate 11a due to the target object 1 (for example, a fingerprint).
以所述电容式感测***10为指纹感测***、目标物体1对应为手指为例，当手指与所述传感器板11之间稳定耦合时，传感器板11上电压的变化，则传感器板11和手指之间的电容所存储的电量发生 变化，通过检测这个电量变化量，就可以测出电容的大小。由于传感器板11和接地端13a上的电压基本同步变化，传感器板11和接地端13a之间的电压差保持不变，则寄生电容C1没有充放电，从而其等效电容为零。这样，电容检测电路13所检测到的电荷基本都是由传感器板11和手指直接构成的电容的电压变化而引起的，减少了寄生电容C1的影响。Taking the capacitive sensing system 10 as a fingerprint sensing system and the target object 1 as a finger, when the finger is stably coupled with the sensor board 11, the voltage on the sensor board 11 changes, and the sensor board 11 The amount of electricity stored by the capacitor between the finger and the finger occurs Change, by detecting the amount of change in the amount of electricity, you can measure the size of the capacitor. Since the voltage on the sensor board 11 and the ground terminal 13a changes substantially synchronously, the voltage difference between the sensor board 11 and the ground terminal 13a remains unchanged, and the parasitic capacitance C1 is not charged and discharged, so that its equivalent capacitance is zero. Thus, the electric charge detected by the capacitance detecting circuit 13 is basically caused by the voltage change of the capacitance directly formed by the sensor board 11 and the finger, and the influence of the parasitic capacitance C1 is reduced.
进一步地，当接地端13a上施加的第一调制信号幅度越大，则传感器板11与手指之间的电压变化越大，对应地，传感器板11与手指构成的电容的电荷变化越大，所述电容检测电路13检测到的电荷量变化越大。如果噪声不变，则电容检测电路13检测到的来自传感器板11所输出的感测信号的信噪比将线性增加。所以，提高施加在接地端13a上的第一调制信号的幅度峰峰值，会增加所述电容检测***10的信噪比，比如提高到10V，15V，甚至20V。Further, the greater the amplitude of the first modulation signal applied on the ground terminal 13a, the greater the voltage change between the sensor board 11 and the finger, and correspondingly, the greater the change in the charge of the capacitor formed by the sensor board 11 and the finger. The change in the amount of charge detected by the capacitance detecting circuit 13 is larger. If the noise does not change, the signal-to-noise ratio detected by the capacitance detecting circuit 13 from the sensing signal output from the sensor board 11 will increase linearly. Therefore, increasing the amplitude peak-to-peak value of the first modulation signal applied to the ground terminal 13a increases the signal-to-noise ratio of the capacitance detecting system 10, for example, to 10V, 15V, or even 20V.
请参阅图3，图3为第一激励信号与第一调制信号的波形示意图。其中字母“M”代表第一激励信号，字母“N”代表第一调制信号。在本实施方式中，以所述第一调制信号与第一激励信号均为周期性变化的方波信号为例进行说明。所述第一调制信号的低电平为0V，高电平为10V。所述第一激励信号的低电平为1.2V，高电平为11.2V。然，可以理解地，在其它变更实施方式中，所述第一调制信号、第一激励信号的高电平与低电平也可为其它电压，以及其它合适类型的信号，如正弦波。Please refer to FIG. 3. FIG. 3 is a schematic diagram of waveforms of a first excitation signal and a first modulation signal. The letter "M" represents the first excitation signal and the letter "N" represents the first modulation signal. In the present embodiment, a square wave signal in which the first modulation signal and the first excitation signal are periodically changed will be described as an example. The low level of the first modulation signal is 0V, and the high level is 10V. The low level of the first excitation signal is 1.2V, and the high level is 11.2V. It can be understood that, in other modified embodiments, the high level and the low level of the first modulation signal and the first excitation signal may also be other voltages, and other suitable types of signals, such as sine waves.
请继续参阅图1，所述接地端13a用于加载第一电源信号，所述第一电源信号包括所述第一调制信号。所述电容检测电路13进一步包括电源端13b，所述电源端13b加载第二电源信号，所述第二电源信号为电压信号，且所述电源信号的电压高于第一电源信号的电压，所述第二电源信号随所述第一调制信号的变化而变化，或者所述第二电源信号随所述第一电源信号的变化而变化。Referring to FIG. 1 , the ground terminal 13 a is used to load a first power signal, and the first power signal includes the first modulation signal. The capacitance detecting circuit 13 further includes a power terminal 13b, the power terminal 13b is loaded with a second power signal, the second power signal is a voltage signal, and the voltage of the power signal is higher than the voltage of the first power signal. The second power signal changes as the first modulation signal changes, or the second power signal changes as the first power signal changes.
所述第二电源信号与所述第一电源信号之间的电压差为所述电容检测电路13工作的电源电压。优选地，所述电容检测电路13中的 其它电压均随所述第一电源信号的电压的升高而升高、随所述第一电源信号的电压的降低而降低。The voltage difference between the second power signal and the first power signal is a power voltage at which the capacitance detecting circuit 13 operates. Preferably, in the capacitance detecting circuit 13 The other voltages increase as the voltage of the first power signal increases, and decrease as the voltage of the first power signal decreases.
相应地，所第二电源信号的电压随所述第一调制信号的电压的升高而升高、随所述第一调制信号的电压的降低而降低，或者所第二电源信号的电压随所述第一电源信号的电压的升高而升高、随所述第一电源信号的电压的降低而降低。Correspondingly, the voltage of the second power signal increases as the voltage of the first modulation signal increases, decreases as the voltage of the first modulation signal decreases, or the voltage of the second power signal follows The voltage of the first power signal rises and rises, and decreases with the voltage of the first power signal.
更优选地，所述第二电源信号与所述第一调制信号为同频信号，或者所述第二电源信号与所述第一电源信号为同频信号。More preferably, the second power signal and the first modulated signal are co-frequency signals, or the second power signal and the first power signal are co-frequency signals.
在上述中，以所述第一调制信号仅包括高、低两个电平交替变化的方波信号为例进行了说明，然，所述第一调制信号并不仅限于高、低两个电平交替变化。所述第一调制信号是至少包括第一电平与第二电平、且所述第一电平的电压不同于所述第二电平的电压的信号。在另一实施方式中，第一电平为高电平，例如为10V，第二电平为低电平，例如为0V。可变更地，第一电平也可为低电平，第二电平为高电平，且高、低电平的电压大小也可根据实际需要对应调整。In the above description, the first modulated signal includes only a square wave signal in which two levels of high and low are alternately changed. However, the first modulated signal is not limited to two levels of high and low. Alternate changes. The first modulation signal is a signal including at least a first level and a second level, and a voltage of the first level is different from a voltage of the second level. In another embodiment, the first level is a high level, such as 10V, and the second level is a low level, such as 0V. Alternatively, the first level may also be a low level, the second level is a high level, and the voltage levels of the high and low levels may also be adjusted according to actual needs.
所述第一调制信号包括第一电平与第二电平交替出现的方波信号。优选地，所述第一调制信号为周期性变化的方波信号。然，所述第一调制信号并不限于方波信号，也可以为正弦波，三角波等其它合适类型的信号。其中，所述第一电平与第二电平的电压情况为下述三种情况中的任意一种：The first modulated signal includes a square wave signal that alternates between a first level and a second level. Preferably, the first modulated signal is a periodically varying square wave signal. However, the first modulated signal is not limited to a square wave signal, and may be other suitable types of signals such as a sine wave, a triangular wave, and the like. Wherein, the voltage conditions of the first level and the second level are any one of the following three cases:
第一：第一电平的电压为正电压，第二电平的电压为0V；First: the voltage of the first level is a positive voltage, and the voltage of the second level is 0V;
第二：第一电平的电压为0V，第二电平的电压为负电压；Second: the voltage of the first level is 0V, and the voltage of the second level is a negative voltage;
第三：第一电平的电压为正电压，第二电平的电压为负电压，所述第一电平的电压的绝对值等于或者不等于所述第二电平的电压的绝对值。Third, the voltage of the first level is a positive voltage, and the voltage of the second level is a negative voltage, and the absolute value of the voltage of the first level is equal to or not equal to the absolute value of the voltage of the second level.
对于上述第三种情况，当正负电压的中心值恰好或者接近为电子设备100的***地电压时，则其平均对外电压为0V或者接近为0V，对电子设备100内的其它元件或者外部物体所造成的低频激励将显著减少。例如，当第一调制信号的电平为0到10伏的方波时，等效 有一个5V的直流信号，这个直流信号将对外产生电场，可能引起电流流过人体或增加对外辐射或者影响到电子设备100内的其它器件。For the third case described above, when the center value of the positive and negative voltages is just or close to the system ground voltage of the electronic device 100, the average external voltage is 0V or close to 0V, for other components or external objects in the electronic device 100. The resulting low frequency excitation will be significantly reduced. For example, when the level of the first modulated signal is a square wave of 0 to 10 volts, the equivalent There is a 5V DC signal that will generate an external electric field that may cause current to flow through the body or increase external emissions or affect other devices within the electronic device 100.
所述电容检测电路13在所述接地端13a加载第一电平时，从所述传感器板11读取第一信号，并在所述接地端13a加载第二电平时，从所述传感器板11读取第二信号，通过所述读取的第一信号与第二信号获得所述目标物体1的预定信息。The capacitance detecting circuit 13 reads the first signal from the sensor board 11 when the ground terminal 13a is loaded with the first level, and reads from the sensor board 11 when the ground terminal 13a is loaded with the second level. Taking a second signal, obtaining predetermined information of the target object 1 by using the read first signal and the second signal.
请参阅图4，图4为所述第一调制信号的另一实施方式的波形图。所述第一调制信号包括所述第一电平、所述第二电平、和第三电平，所述第二电平的电压介于第一电平的电压与第三电平的电压之间，所述第一调制信号包括由第一电平、第二电平、第三电平三者构成的二级阶梯方波信号。Please refer to FIG. 4. FIG. 4 is a waveform diagram of another embodiment of the first modulated signal. The first modulation signal includes the first level, the second level, and a third level, and the voltage of the second level is between a voltage of a first level and a voltage of a third level The first modulation signal includes a two-step square wave signal composed of a first level, a second level, and a third level.
所述电容检测电路13在所述接地端13a提供第一电平给所述传感器板11时，从所述传感器板11读取第一信号，在所述接地端13a提供第二电平给所述传感器板11时，从所述传感器板11读取第二信号，在所述接地端13a提供第三电平给所述传感器板11时，从所述传感器板11读取第三信号，并在所述接地端13a从提供第三电平切换为提供第二电平时，从所述传感器板11读取第四信号，通过所述读取的第一信号、第二信号、第三信号与第四信号获得目标物体1的预定信息。The capacitance detecting circuit 13 reads a first signal from the sensor board 11 when the ground terminal 13a supplies a first level to the sensor board 11, and provides a second level to the ground terminal 13a. When the sensor board 11 is described, the second signal is read from the sensor board 11, and when the ground level 13a provides a third level to the sensor board 11, the third signal is read from the sensor board 11, and When the ground terminal 13a is switched from providing the third level to providing the second level, the fourth signal is read from the sensor board 11 through the read first signal, the second signal, the third signal and The fourth signal obtains predetermined information of the target object 1.
请再参阅图1，优选地，所述电容式感测***10进一步包括控制电路15，所述电容检测电路13的接地端13a与所述控制电路15电连接，所述控制电路15用于施加所述第一调制信号到所述电容检测电路13的接地端13a。Referring to FIG. 1 again, preferably, the capacitive sensing system 10 further includes a control circuit 15, the ground terminal 13a of the capacitance detecting circuit 13 is electrically connected to the control circuit 15, and the control circuit 15 is used for applying The first modulation signal is to the ground terminal 13a of the capacitance detecting circuit 13.
进一步地，所述电容检测电路13的电源端13b与所述控制电路15电连接，所述控制电路15用于控制所述电容检测电路13的电源端13b与接地端13a之间的电压差保持一致。所述控制电路15提供所述第一电源信号给所述接地端13a，提供第二电源信号给所述电源端13b，从而为所述电容检测电路13正常工作提供所需的电源电压。Further, the power terminal 13b of the capacitance detecting circuit 13 is electrically connected to the control circuit 15, and the control circuit 15 is configured to control the voltage difference between the power terminal 13b and the ground terminal 13a of the capacitance detecting circuit 13 to be maintained. Consistent. The control circuit 15 provides the first power signal to the ground terminal 13a, and provides a second power signal to the power terminal 13b to provide a required power voltage for the capacitor detecting circuit 13 to operate normally.
所述控制电路15包括接地端15a、电源端15b、第一输出端15c、 第二输出端15d。其中，第一输出端15c与所述电容检测电路13的接地端13a连接，用于输出所述第一电源信号给所述接地端13a。所述第二输出端15d与所述电容检测电路13的电源端13b连接，用于输出所述第二电源信号给所述电源端13b。所述控制电路15的接地端15a的电压为0伏、或者为所述电子设备100的***地电压、或者为恒定电压。所述控制电路15的电源端15b用于接收电源电压。另外，所述控制电路15与所述电容检测电路13之间也设置通信接口(未标示)，以进行信息通信。The control circuit 15 includes a ground terminal 15a, a power terminal 15b, a first output terminal 15c, The second output 15d. The first output end 15c is connected to the ground end 13a of the capacitance detecting circuit 13 for outputting the first power signal to the ground end 13a. The second output terminal 15d is connected to the power terminal 13b of the capacitance detecting circuit 13 for outputting the second power signal to the power terminal 13b. The voltage of the ground terminal 15a of the control circuit 15 is 0 volts, or the system ground voltage of the electronic device 100, or a constant voltage. The power terminal 15b of the control circuit 15 is for receiving a power supply voltage. In addition, a communication interface (not labeled) is also provided between the control circuit 15 and the capacitance detecting circuit 13 for information communication.
请继续参阅图1，优选地，所述电子设备100进一步包括主控芯片20，所述主控芯片20与所述控制电路15的接地端15a、电源端15b连接，用于为所述主控电路15提供***地电压与电源电压，为所述控制电路15供电。另外，所述主控芯片20与所述控制电路15之间进一步设置有通信接口(未标示)，以进行信息通信。所述***地电压通常为电子设备100的供电电源的负极的电压。供电电源如为电池。Please refer to FIG. 1 . Preferably, the electronic device 100 further includes a main control chip 20 , and the main control chip 20 is connected to the ground end 15 a and the power end 15 b of the control circuit 15 for the main control. Circuit 15 provides a system ground voltage and a supply voltage to power control circuit 15. In addition, a communication interface (not labeled) is further disposed between the main control chip 20 and the control circuit 15 for information communication. The system ground voltage is typically the voltage of the negative terminal of the power supply of the electronic device 100. The power supply is a battery.
请参阅图5，图5为图1所示电容检测电路13的结构示意图。所述电容检测电路13进一步包括多个感测单元13c和多个选择单元13d。每一感测单元13c分别通过一选择单元13d连接至多个电容感测极板11a。所述选择单元13d用于在电容检测电路13工作时，对应控制电容感测极板11a与感测单元13电连接的数量。在本实施方式中，每一选择单元13d包括开关S(图未示)。所述开关S分别与所述感测单元13c和至少一电容感测极板11a连接。Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of the capacitance detecting circuit 13 of FIG. The capacitance detecting circuit 13 further includes a plurality of sensing units 13c and a plurality of selecting units 13d. Each of the sensing units 13c is connected to the plurality of capacitive sensing plates 11a through a selection unit 13d. The selecting unit 13d is configured to control the number of electrical connection between the capacitive sensing plate 11a and the sensing unit 13 when the capacitance detecting circuit 13 operates. In the present embodiment, each selection unit 13d includes a switch S (not shown). The switch S is respectively connected to the sensing unit 13c and at least one capacitive sensing plate 11a.
当所述电容检测电路13提供第一激励信号给所述电容感测电极11a时，通过所述选择单元13d，可选择每一感测单元13c与相连接的电容感测极板11a均电导通，从而，使得所述第一激励信号同时输出给所有电容感测极板11a。然，在其它实施方式中，也可通过所述选择单元13d，每次只控制部分电容感测极板11a与所述多个感测单元13c电导通，如此，通过多次选择之后，每一感测单元13c与相连接的电容感测极板11a均电导通过，从而，使得所述第一激励信号分 时输出给所述多个电容感测极板11a。When the capacitance detecting circuit 13 supplies the first excitation signal to the capacitance sensing electrode 11a, each of the sensing unit 13c and the connected capacitive sensing plate 11a can be selectively electrically connected through the selecting unit 13d. Thereby, the first excitation signal is simultaneously output to all of the capacitance sensing plates 11a. However, in other embodiments, only the part of the capacitive sensing plate 11a and the plurality of sensing units 13c are electrically connected to each other through the selecting unit 13d, and thus, after multiple selections, each The sensing unit 13c and the connected capacitive sensing plates 11a are both electrically conducted, thereby causing the first excitation signal to be divided. It is output to the plurality of capacitive sensing plates 11a.
当所述电容检测电路13接收所述多个电容感测极板11a输出的感测信号时，通过所述选择单元13d，每次只控制每一感测单元13c分别与一电容感测极板11a电连接，来接收感测信号。如此，通过多次控制，获得所有电容感测极板11a输出的感测信号。然，在其它实施方式中，也可每次控制每一感测单元13c分别与多个(如2个)电容感测极板11a电连接，来接收感测信号。相应地，所述电容检测电路13通过接收到的感测信号获得目标物体1的预定信息。When the capacitance detecting circuit 13 receives the sensing signals output by the plurality of capacitive sensing plates 11a, each of the sensing units 13c and each of the capacitive sensing plates are controlled by the selecting unit 13d. 11a is electrically connected to receive the sensing signal. Thus, the sensing signals output by all of the capacitive sensing plates 11a are obtained by multiple control. However, in other embodiments, each sensing unit 13c may be electrically connected to a plurality of (eg, two) capacitive sensing pads 11a each time to receive a sensing signal. Accordingly, the capacitance detecting circuit 13 obtains predetermined information of the target object 1 by the received sensing signal.
请参阅图6，图6为图5所示感测单元13c的电路结构示意图。所述感测单元13c包括运算放大器131、反馈支路133、和计算单元135。所述运算放大器131包括同相端a、反相端b、和输出端d。所述反馈支路133连接于反相端b与输出端d之间。所述计算单元135与所述输出端d连接。所述反馈支路133包括一反馈电容Cf，所述反馈电容Cf连接于反相端b与输出端d之间。Please refer to FIG. 6. FIG. 6 is a schematic diagram showing the circuit structure of the sensing unit 13c shown in FIG. The sensing unit 13c includes an operational amplifier 131, a feedback branch 133, and a calculation unit 135. The operational amplifier 131 includes an in-phase terminal a, an inverting terminal b, and an output terminal d. The feedback branch 133 is connected between the inverting terminal b and the output terminal d. The calculation unit 135 is connected to the output terminal d. The feedback branch 133 includes a feedback capacitor Cf connected between the inverting terminal b and the output terminal d.
所述运算放大器131的同相端a接收一参考电压Vref。所述参考电压Vref由一参考电压产生电路19提供。需要说明的是，所述参考电压产生电路19可为所述电容检测***10中的一电路，也可为所述电子设备100中的另一电路。所述运算放大器131的反相端b则通过所述选择单元13d与电容感测极板11a连接。所述运算放大器131进一步与所述电源端13b和接地端13a分别电连接。The non-inverting terminal a of the operational amplifier 131 receives a reference voltage Vref. The reference voltage Vref is supplied from a reference voltage generating circuit 19. It should be noted that the reference voltage generating circuit 19 may be one circuit in the capacitance detecting system 10 or another circuit in the electronic device 100. The inverting terminal b of the operational amplifier 131 is connected to the capacitive sensing plate 11a via the selection unit 13d. The operational amplifier 131 is further electrically connected to the power terminal 13b and the ground terminal 13a, respectively.
当电容检测电路13工作时，所述运算放大器131处于虚短状态，即同相端13a与反相端13b相当于短接，二者电位相同，即同相端a的电位也为参考电压Vref。进一步地，所述参考电压Vref随接地端13a所接收到的第一调制信号的变化而变化。从而，当接地端13a输出第一调制信号给运算放大器131时，同相端a与反相端b的电位随第一调制信号的变化而变化，相应地，与运算放大器131的反相端b电导通的电容感测极板11a则接收到的第一激励信号随第一调制信号的变化而变化。When the capacitance detecting circuit 13 is in operation, the operational amplifier 131 is in a virtual short state, that is, the non-inverting terminal 13a and the inverting terminal 13b are short-circuited, and the potentials of the two are the same, that is, the potential of the non-inverting terminal a is also the reference voltage Vref. Further, the reference voltage Vref varies with the change of the first modulation signal received by the ground terminal 13a. Therefore, when the ground terminal 13a outputs the first modulation signal to the operational amplifier 131, the potentials of the in-phase terminal a and the inverting terminal b vary with the change of the first modulation signal, and accordingly, conductance with the inverting terminal b of the operational amplifier 131. The first excitation signal received by the capacitive sensing plate 11a changes as the first modulation signal changes.
当目标物体1接近或触摸所述电容感测极板11a时，则发生的电 荷变化通过与反相端b相连接的反馈电容Cf传输给计算单元135。所述计算单元135根据电荷变化情况对应获得目标物体1的预定信息。在本实施例中，是以电荷变化来计算预定信息的，在其它实施方式中，也可通过计算电压变化来获得预定信息。When the target object 1 approaches or touches the capacitive sensing plate 11a, the electricity that occurs The charge change is transmitted to the calculation unit 135 through the feedback capacitance Cf connected to the inverting terminal b. The calculation unit 135 correspondingly obtains predetermined information of the target object 1 according to the charge change condition. In the present embodiment, the predetermined information is calculated with the change in charge, and in other embodiments, the predetermined information can also be obtained by calculating the voltage change.
以所述电容式感测***10为指纹感测***为例，每个电容感测极板11a都可以检测手指与其相耦合的电容的大小。手指指纹存在脊和谷，脊相比谷更靠近所述传感器板11，因而电容更大；谷相比脊更远离所述传感器板11，因而电容更小。根据电容感测极板11a与手指指纹形成电容的大小，可以检测每一电容感测极板11a所对应区域上的指纹的脊和谷。Taking the capacitive sensing system 10 as a fingerprint sensing system as an example, each of the capacitive sensing plates 11a can detect the size of a capacitor to which a finger is coupled. The finger prints have ridges and valleys that are closer to the sensor plate 11 than the valleys, and thus have a larger capacitance; the valleys are further away from the sensor plate 11 than the ridges, and thus have a smaller capacitance. According to the size of the capacitive sensing plate 11a and the finger fingerprint forming capacitance, the ridges and valleys of the fingerprint on the area corresponding to each of the capacitive sensing plates 11a can be detected.
为了更准确的读取指纹信息，通常传感器板11设计成阵列状，一个电容感测极板11a中心与其邻近的电容感测极板11a中心的距离大约为50um。为了达到这样的精度，通常采用半导体工艺直接在集成电路上实现传感器板11和电容检测电路13。为了便于设计，又把控制电路15和电容检测电路13分开，分别设计成控制芯片和电容检测芯片，其中电容检测芯片包括传感器板11和电容检测电路13。通常手指在十数毫米范围，这样一个手指，通常对应多个电容感测极板11a。为了减少成本，节约空间，即使放置多个电容感测极板11a，其数量亦相当有限，例如为160×64个电容感测极板11a，其面积约为8mm×3.2mm。而手指面积通常远大于传感器板11的面积。手指和传感器板11形成的电场示意图如图7所示。In order to read the fingerprint information more accurately, the sensor boards 11 are usually designed in an array, and the center of one of the capacitive sensing plates 11a is at a distance of about 50 μm from the center of the adjacent capacitive sensing plate 11a. In order to achieve such accuracy, the sensor board 11 and the capacitance detecting circuit 13 are usually implemented directly on the integrated circuit using a semiconductor process. For the convenience of design, the control circuit 15 and the capacitance detecting circuit 13 are separately separated, and are respectively designed as a control chip and a capacitance detecting chip. The capacitance detecting chip includes a sensor board 11 and a capacitance detecting circuit 13. Usually the finger is in the range of a few ten millimeters, such a finger, usually corresponding to a plurality of capacitive sensing plates 11a. In order to reduce the cost and save space, even if a plurality of capacitive sensing plates 11a are placed, the number thereof is rather limited, for example, 160 × 64 capacitive sensing plates 11a having an area of about 8 mm × 3.2 mm. The finger area is usually much larger than the area of the sensor board 11. A schematic diagram of the electric field formed by the finger and the sensor board 11 is shown in FIG.
请参阅图7，图7为所述传感器板11与手指之间的电场线分布示意图。根据电场分布的物理规律，所述传感器板11周边的电容感测极板11a与所述目标物体1之间的电场不同于所述传感器板11中间的电容感测极板11a与所述目标物体1之间的电场。由图7可见，中间的电场分布比较均匀，而周边的电场是发散的，由此造成获取的指纹信息在边缘会有失真现象。Please refer to FIG. 7. FIG. 7 is a schematic diagram of electric field line distribution between the sensor board 11 and a finger. According to the physical law of the electric field distribution, the electric field between the capacitive sensing plate 11a and the target object 1 around the sensor board 11 is different from the capacitive sensing plate 11a and the target object in the middle of the sensor board 11. The electric field between 1. It can be seen from Fig. 7 that the electric field distribution in the middle is relatively uniform, and the surrounding electric field is divergent, thereby causing distortion of the acquired fingerprint information at the edge.
为了解决指纹信息在边缘失真的问题，本发明提出在所述电容式感测***10中进一步设置屏蔽电极17(见后述图8)的技术方案。所述 屏蔽电极17由导电物质制成，如为金属或者其它导电材料。所述屏蔽电极17至少设置于所述感应阵列的周围。所述屏蔽电极17接收电信号，但是所述屏蔽电极17并不用于执行检测功能，相应地，所述屏蔽电极17不输出数据。In order to solve the problem that the fingerprint information is distorted at the edge, the present invention proposes a technical solution in which the shield electrode 17 (see FIG. 8 described later) is further provided in the capacitive sensing system 10. Said The shield electrode 17 is made of a conductive material such as a metal or other conductive material. The shielding electrode 17 is disposed at least around the sensing array. The shield electrode 17 receives an electrical signal, but the shield electrode 17 is not used to perform a detection function, and accordingly, the shield electrode 17 does not output data.
请一并参阅图8与图9，图8为在图2所示的传感器板11周围区域设置屏蔽电极17的结构示意图。图9为图8所示传感器板11与手指1之间的电场线分布示意图。在本实施方式中，所述屏蔽电极17与图1所示的电容检测电路13的接地端13a电连接。所述屏蔽电极17接收所述第一电源信号。相应地，所述屏蔽电极17的电压与所述传感器11电压基本同步变化。从而，由图8所示，所述传感器板11周边的电场与中部的电场一样均匀，可以提高所采集的预定信息的质量。Please refer to FIG. 8 and FIG. 9 together. FIG. 8 is a schematic structural view of the shielding electrode 17 disposed around the sensor board 11 shown in FIG. FIG. 9 is a schematic view showing the electric field line distribution between the sensor board 11 and the finger 1 shown in FIG. In the present embodiment, the shield electrode 17 is electrically connected to the ground terminal 13a of the capacitance detecting circuit 13 shown in FIG. The shield electrode 17 receives the first power signal. Correspondingly, the voltage of the shield electrode 17 changes substantially synchronously with the voltage of the sensor 11. Thus, as shown in Fig. 8, the electric field around the sensor panel 11 is as uniform as the electric field in the middle portion, and the quality of the collected predetermined information can be improved.
然，本发明并不局限于此，在其它实施方式中，所述屏蔽电极17也可以与所述电子设备100中的另一信号电路(图未示)连接，所述信号电路提供与接地端13a相同的信号、或者与传感器板11相同的信号给所述屏蔽电极17。The present invention is not limited thereto. In other embodiments, the shielding electrode 17 may also be connected to another signal circuit (not shown) in the electronic device 100. The signal circuit is provided with a ground terminal. The same signal as 13a or the same signal as the sensor board 11 is given to the shield electrode 17.
进一步地，在本实施方式中，所述屏蔽电极17为一中间镂空的电极，所述传感器11板对应所述屏蔽电极17的镂空区域设置，优选地，所述屏蔽电极17为一封闭环形电极，环绕于所述传感器板11的周围。然，在其它实施方式中，所述屏蔽电极17也可包括多个电极，并分布于所述传感器板11的周围；又或者，所述屏蔽电极17为一整层电极或者多个电极，其与所述传感器板11层叠设置，且沿垂直层叠的方向，所述屏蔽电极17的周边超出所述传感器板11的***。Further, in the present embodiment, the shield electrode 17 is an intermediate hollow electrode, and the sensor 11 plate is disposed corresponding to the hollow region of the shield electrode 17. Preferably, the shield electrode 17 is a closed loop electrode. Surrounding the periphery of the sensor board 11. However, in other embodiments, the shielding electrode 17 may also include a plurality of electrodes and are distributed around the sensor board 11; or, the shielding electrode 17 is a whole layer electrode or a plurality of electrodes, The sensor board 11 is laminated, and in the direction of vertical stacking, the periphery of the shield electrode 17 is beyond the periphery of the sensor board 11.
更进一步地，发明人通过大量研究发现，如果额外设置屏蔽电极17不仅会增加电容式感测***10的体积重量、而且还会增加制造成本外，相应地，发明人通过大量的创造性劳动，发现利用所述电容感测***10本身存在的导电元件复用兼做所述屏蔽电极17、或/和利用制作本身存在的导电元件的同时利用需要裁切掉的导电材料同时制作所述屏蔽电极17，具体说明如下。 Further, the inventors have found through extensive research that if the shield electrode 17 is additionally provided not only increases the volumetric weight of the capacitive sensing system 10, but also increases the manufacturing cost, accordingly, the inventor discovers through a large amount of creative labor. The shielding electrode 17 is simultaneously fabricated by using the conductive element existing in the capacitance sensing system 10 as the shielding electrode 17, or/and using the conductive material existing in the fabrication itself while utilizing the conductive material that needs to be cut off. The specific description is as follows.
优选地，所述电容检测电路13集成于一电容检测电路芯片中，所述控制电路15集成于一控制电路芯片中。所述电容检测电路芯片和所述控制电路芯片或者封装在一个集成电路封装里，或者分别封装在两个集成电路封装里。Preferably, the capacitance detecting circuit 13 is integrated in a capacitance detecting circuit chip, and the control circuit 15 is integrated in a control circuit chip. The capacitance detecting circuit chip and the control circuit chip are either packaged in one integrated circuit package or separately packaged in two integrated circuit packages.
根据电容检测电路芯片的封装方式不同，现以封装方式分别为方形扁平无引脚封装(Quad Flat No-lead Package,简称QFN)与球栅阵列封装(Ball Grid Array Package，简称BGA)进行说明。然，并不局限于这两种封装方式，也可以为其它封装方式。According to the different packaging methods of the capacitance detecting circuit chip, the package is generally described as a Quad Flat No-lead Package (QFN) and a Ball Grid Array Package (BGA). However, it is not limited to these two packaging methods, and may be other packaging methods.
封装方式QFNPackage method QFN
请一并参见图10与图11，图10为封装方式为QFN的电容检测电路芯片封装结构的正面部分示意图。图11为图10所示电容检测电路芯片封装结构沿XI-XI线的剖面结构示意图。所述电容检测电路芯片封装结构30包括散热板31、导线32、引线框(lead frame)33、引线框35、电容检测电路芯片37。所述引线框33由导电材料制成，位于所述电容检测电路芯片37周围，并与电容检测电路芯片37通过导线32连接，为所述电容检测电路芯片37传输信号。Please refer to FIG. 10 and FIG. 11 together. FIG. 10 is a schematic diagram of the front part of the capacitor detecting circuit chip package structure of the QFN package. 11 is a cross-sectional structural view of the capacitance detecting circuit chip package structure shown in FIG. 10 taken along line XI-XI. The capacitance detecting circuit chip package structure 30 includes a heat dissipation plate 31, a wire 32, a lead frame 33, a lead frame 35, and a capacitance detecting circuit chip 37. The lead frame 33 is made of a conductive material, is disposed around the capacitance detecting circuit chip 37, and is connected to the capacitance detecting circuit chip 37 via a wire 32 to transmit a signal to the capacitance detecting circuit chip 37.
进一步地，电容检测电路芯片37与散热板31层叠设置，且沿垂直层叠的方向，散热板31的边缘超出所述电容检测电路芯片37的周边。所述散热板31由导电材料制成，其用于散热，另外，所述散热板31进一步用于与所述接地端13a电连接，还用作为所述屏蔽电极17。由于散热板31复用作为屏蔽电极17，无需额外再制作屏蔽电极17，从而电容式感测***10的体积较小、重量较轻、且制造成本较低。Further, the capacitance detecting circuit chip 37 is laminated with the heat dissipation plate 31, and the edge of the heat dissipation plate 31 is beyond the periphery of the capacitance detecting circuit chip 37 in the vertically stacked direction. The heat dissipation plate 31 is made of a conductive material for heat dissipation. Further, the heat dissipation plate 31 is further used for electrical connection with the ground terminal 13a, and also serves as the shield electrode 17. Since the heat dissipation plate 31 is multiplexed as the shield electrode 17, the shield electrode 17 is not required to be additionally fabricated, so that the capacitive sensing system 10 is small in size, light in weight, and low in manufacturing cost.
又或者，在制作引线框33时，由制作引线框33的同层材料制作形成所述屏蔽电极17，优选地，也在制作引线框33的同时制作形成所述屏蔽电极17，从而节省制程、节省材料，从而节省成本。所述屏蔽电极17位于所述散热板17与所述引线框33之间的位置，或者与引线框33共同配合环绕所述散热板31设置。Alternatively, when the lead frame 33 is formed, the shield electrode 17 is formed by the same layer material from which the lead frame 33 is formed. Preferably, the shield electrode 17 is formed while the lead frame 33 is formed, thereby saving process, Save on materials and save costs. The shield electrode 17 is located at a position between the heat dissipation plate 17 and the lead frame 33 or is disposed in cooperation with the lead frame 33 around the heat dissipation plate 31.
在本实施方式中，所述散热板31与引线框33位于同一层。可变 更地，所述屏蔽电极17也可以由制作散热板31的同层材料同时制作形成。In the present embodiment, the heat dissipation plate 31 and the lead frame 33 are located in the same layer. Variable Further, the shield electrode 17 may also be formed at the same time from the same layer material from which the heat dissipation plate 31 is formed.
球栅阵列封装BGABall grid array package BGA
请参见图12，图12为封装方式为BGA的电容检测电路芯片封装结构的部分示意图。所述电容检测电路芯片封装结构40包括基板41、电容检测电路芯片43、屏蔽电极17。所述电容检测电路芯片43与屏蔽电极17设置在所述基板41上，且优选地，所述电容检测电路芯片43与屏蔽电极17位于所述基板41的同一侧。所述屏蔽电极17设置在所述电容检测电路芯片43周围。所述基板41例如为印刷电路板、或软性电路板。Referring to FIG. 12, FIG. 12 is a partial schematic diagram of a capacitor detection circuit chip package structure in a package mode of BGA. The capacitance detecting circuit chip package structure 40 includes a substrate 41, a capacitance detecting circuit chip 43, and a shield electrode 17. The capacitance detecting circuit chip 43 and the shield electrode 17 are disposed on the substrate 41, and preferably, the capacitance detecting circuit chip 43 and the shield electrode 17 are located on the same side of the substrate 41. The shield electrode 17 is disposed around the capacitance detecting circuit chip 43. The substrate 41 is, for example, a printed circuit board or a flexible circuit board.
进一步地，在其它实施方式中，所述电容检测***10包括两种检测模式，分别为第一检测模式和第二检测模式。所述电容检测电路10除用于在所述接地端13a加载所述第一调制信号时、提供随所述第一调制信号的变化而变化的第一激励信号驱动所述传感器板11来执行第一检测模式外，还进一步用于在所述接地端13a加载第二调制信号时、提供随所述第二调制信号的变化而变化的第二激励信号驱动所述传感器板11来执行第二检测模式，其中，第一调制信号不同于第二调制信号，第二激励信号不同于第一激励信号。所述控制电路15提供给所述接地端13a的第一电源信号包括所述第二调制信号。Further, in other embodiments, the capacitance detecting system 10 includes two detection modes, a first detection mode and a second detection mode, respectively. The capacitance detecting circuit 10 is configured to drive the sensor board 11 to perform the first driving signal when the grounding end 13a loads the first modulation signal, and provides a first excitation signal that changes according to the change of the first modulation signal. In addition to a detection mode, the method further includes: when the grounding end 13a is loaded with the second modulation signal, providing a second excitation signal that varies with the change of the second modulation signal, driving the sensor board 11 to perform the second detection. a mode, wherein the first modulation signal is different from the second modulation signal, and the second excitation signal is different from the first excitation signal. The first power signal supplied to the ground terminal 13a by the control circuit 15 includes the second modulation signal.
所述电容式感测***10通过分别执行所述第一、第二检测模式，进而可执行至少二种功能不同的感测操作，从而增加所述电容式感测***10的感测功能，增强电子设备100的可用性。The capacitive sensing system 10 can perform at least two different sensing operations by performing the first and second detecting modes respectively, thereby increasing the sensing function of the capacitive sensing system 10 and enhancing Availability of the electronic device 100.
优选地，所述第二激励信号随所述第二调制信号的变化而变化，用以减小所述传感器板与所述接地端之间寄生电容的充放电电量。Preferably, the second excitation signal varies with the change of the second modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
所述第二调制信号、第二激励信号均为电压信号，优选地，所述第二激励信号的电压随所述第二调制信号的电压的升高而升高、随所述第二调制信号的电压的降低而降低，或者所述第二激励信号的电压随所述第一电源信号的电压的升高而升高、随所述第一电源信号的电压的降低而降低。 The second modulation signal and the second excitation signal are both voltage signals. Preferably, the voltage of the second excitation signal increases as the voltage of the second modulation signal increases, and the second modulation signal The voltage is lowered by a decrease, or the voltage of the second excitation signal increases as the voltage of the first power signal increases, and decreases as the voltage of the first power signal decreases.
更优选地，所述第二激励信号的幅度变化大小与第二调制信号的幅度变化大小相同。More preferably, the magnitude of the amplitude change of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
优选地，所述第二激励信号与所述第二调制信号为周期性变化的信号。Preferably, the second excitation signal and the second modulation signal are periodically varying signals.
所述第二激励信号与所述第二调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第二激励信号的相位相对第二调制信号的相位具有一定的延迟，延迟如为1纳秒。The second excitation signal and the second modulation signal are either the same frequency signal, or the same frequency in-phase signal, or the same amplitude same frequency in-phase signal, or the same frequency signal, and the second excitation signal The phase has a certain delay with respect to the phase of the second modulated signal, and the delay is, for example, 1 nanosecond.
所述第二调制信号至少包括第四电平与第五电平，其中，第四电平的电压不同于第五电平的电压。The second modulation signal includes at least a fourth level and a fifth level, wherein the voltage of the fourth level is different from the voltage of the fifth level.
更进一步地，发明人通过大量研究发现问题：接地端13a和电子设备100的***地，如接地端15a，之间还存在寄生电容C2(见图1)，当激励接地端13a时，同时会激励这个寄生电容C2，当寄生电容C2比较大，激励频率比较高时，则会产生较大的功耗。发明人通过大量的创造性的劳动发现，可以通过如下方式来降低功耗。Further, the inventors have found through a large number of studies that the grounding terminal 13a and the system ground of the electronic device 100, such as the grounding terminal 15a, also have a parasitic capacitance C2 (see FIG. 1), and when the grounding terminal 13a is excited, Exciting this parasitic capacitance C2, when the parasitic capacitance C2 is relatively large and the excitation frequency is relatively high, a large power consumption is generated. Through a large number of creative labor discoveries, the inventors can reduce power consumption by the following means.
所述电容式感测***10工作时，先执行第二检测模式，当所述电容式感测***感测到的目标物体的预定操作时，才启动第一检测模式或切换第二检测模式为第一检测模式进行检测操作，其中，第二检测模式相较于第一检测模式节省功耗。When the capacitive sensing system 10 is in operation, the second detecting mode is first executed, and when the capacitive sensing system senses a predetermined operation of the target object, the first detecting mode is started or the second detecting mode is switched to The first detection mode performs a detection operation, wherein the second detection mode saves power compared to the first detection mode.
相应地，所述第二激励信号随所述第二调制信号的变化而变化，除用以减小所述传感器板11与所述接地端13a之间寄生电容C1的充放电电量，还可进一步用以减小电容式感测***10的功耗。Correspondingly, the second excitation signal changes according to the change of the second modulation signal, and may further reduce the charge and discharge power of the parasitic capacitance C1 between the sensor board 11 and the ground end 13a. It is used to reduce the power consumption of the capacitive sensing system 10.
优选地，第二激励信号的频率小于第一激励信号的频率，或/和第二激励信号的电压峰峰值小于第一激励信号的电压峰峰值，从而达到减小功耗的目的。Preferably, the frequency of the second excitation signal is smaller than the frequency of the first excitation signal, and/or the voltage peak-to-peak value of the second excitation signal is smaller than the voltage peak-to-peak value of the first excitation signal, thereby achieving the purpose of reducing power consumption.
对应地，第二调制信号的频率小于第一调制信号的频率，或/和第二调制信号的电压峰峰值小于第一调制信号的电压峰峰值，从而还可进一步减小功耗。例如，以第一检测模式为指纹感测模式、第二检测模式为触摸检测模式为例进行说明。当所述电容式感测***10处 于触摸检测模式时，所述电容检测电路13用于驱动所述传感器板11执行触摸检测操作，感测目标物体1对所述传感器板11的触摸；当所述电容式感测***10处于指纹检测模式时，所述电容检测电路13用于驱动所述传感器板11执行指纹检测操作，感测目标物体1的指纹。Correspondingly, the frequency of the second modulation signal is smaller than the frequency of the first modulation signal, or/and the voltage peak-to-peak value of the second modulation signal is smaller than the voltage peak-to-peak value of the first modulation signal, so that power consumption can be further reduced. For example, the first detection mode is the fingerprint sensing mode, and the second detection mode is the touch detection mode as an example. When the capacitive sensing system 10 is In the touch detection mode, the capacitance detecting circuit 13 is configured to drive the sensor board 11 to perform a touch detection operation, sensing a touch of the target object 1 on the sensor board 11; when the capacitive sensing system 10 is in a fingerprint In the detection mode, the capacitance detecting circuit 13 is configured to drive the sensor board 11 to perform a fingerprint detecting operation to sense the fingerprint of the target object 1.
所述电容检测电路13通过量测传感器板11与目标物体1之间的电容来感测触摸操作，检测时：先进行触摸检测，检测到有触摸发生时，再启动指纹检测或切换触摸检测为指纹检测，以达到节省功耗的目的。The capacitance detecting circuit 13 senses a touch operation by measuring a capacitance between the sensor board 11 and the target object 1. When detecting: first performing touch detection, detecting that a touch occurs, then starting fingerprint detection or switching touch detection is Fingerprint detection to save power.
具体地，所述电容检测电路13判断所述传感器板11是否被触摸；Specifically, the capacitance detecting circuit 13 determines whether the sensor board 11 is touched;
若是，则切换提供第二调制信号为第一调制信号给所述接地端13a、切换提供第二激励信号为第一激励信号给所述传感器板11，来执行指纹感测；If yes, switching to provide a second modulated signal to the ground terminal 13a, and switching to provide a second excitation signal to the sensor board 11 to perform fingerprint sensing;
若否，则提供第二调制信号给所述接地端13a、提供第二激励信号给所述传感器板11，来执行触摸感测。当所述电容式感测***10处于触摸检测模式时，对所述第二调制信号、第二激励信号这二者其中之一或全部采用1V电压峰峰值，用于检测是否有触摸发生，例如，第二激励信号的电压峰峰值为1V，第二调制信号的电压峰峰值为1V；当容式感测***10处于指纹检测模式时，对第一调制信号、第一激励信号这二者其中之一或全部采用10V电压峰峰值，用于检测指纹，例如，第一激励信号的电压峰峰值为10V，第一调制信号的电压峰峰值为10V。从而，达到减小所述电容式感测***10的功耗的目的，相应地，具有所述电容式感测***10的电子设备100的功耗也较小。If not, a second modulation signal is provided to the ground terminal 13a, and a second excitation signal is supplied to the sensor board 11 to perform touch sensing. When the capacitive sensing system 10 is in the touch detection mode, a voltage peak-to-peak value of 1 V is applied to one or both of the second modulation signal and the second excitation signal for detecting whether a touch occurs, for example, The voltage peak-to-peak value of the second excitation signal is 1V, and the voltage peak-to-peak value of the second modulation signal is 1V; when the capacitive sensing system 10 is in the fingerprint detection mode, the first modulation signal and the first excitation signal are both One or all of the voltage peaks and peaks of 10V are used for detecting the fingerprint. For example, the voltage peak-to-peak value of the first excitation signal is 10V, and the voltage peak-to-peak value of the first modulation signal is 10V. Thus, for the purpose of reducing the power consumption of the capacitive sensing system 10, correspondingly, the power consumption of the electronic device 100 having the capacitive sensing system 10 is also small.
另外，优选地，所述第一激励信号与所述第二激励信号均为周期性变化的信号，其中，第一激励信号的频率大于第二激励信号的频率。对应地，第一调制信号与第二调制信号均为周期性变化的信号，其中，第一调制信号的频率大于第二调制信号的频率。在执行触摸检测时，第二激励信号与第二调制信号的频率如为100KHz。在执行指纹检测 时，第一激励信号与第一调制信号的频率如为1MHz。从而，使得所述电容式感测***10的功耗进一步减小。In addition, preferably, the first excitation signal and the second excitation signal are both periodically changing signals, wherein the frequency of the first excitation signal is greater than the frequency of the second excitation signal. Correspondingly, the first modulated signal and the second modulated signal are both periodically changing signals, wherein the frequency of the first modulated signal is greater than the frequency of the second modulated signal. When the touch detection is performed, the frequencies of the second excitation signal and the second modulation signal are, for example, 100 kHz. Performing fingerprint detection The frequency of the first excitation signal and the first modulation signal is, for example, 1 MHz. Thereby, the power consumption of the capacitive sensing system 10 is further reduced.
当电容式感测***10处于触摸检测模式时，仅仅检测触摸是否发生，不需要像指纹识别那么高的分辨率，因此，多个电容感测极板11a甚至所有的电容感测极板11a可以连接到一起进行检测。When the capacitive sensing system 10 is in the touch detection mode, only detecting whether a touch occurs does not require a high resolution like fingerprint recognition, and therefore, the plurality of capacitive sensing plates 11a or even all of the capacitive sensing plates 11a may Connect together for testing.
优选地，本发明的电容式感测***10为节省驱动环的感测***。现有技术中，一种电容感测***包括驱动环、传感器板、电容检测电路。通过在驱动环上施加激励，驱动环直接接触手指，驱动环上激励传导到手指，驱动手指电位改变。这个方案，一方面需要增加一个驱动环，增加了成本；另一方面驱动环是无法施加太高电压，比如4V。当电压过高时，电流流过人体会造成不舒服的感觉。通常，电压越高，则信号能量越大，则接收到的信号的信噪比越高，***性能越好。这个方案限制了整个***方案的性能。相对地，本发明的电容式感测***10设计比较灵活，性能较好，成本较低，人体也接触时的舒适感较高。Preferably, the capacitive sensing system 10 of the present invention is a sensing system that saves drive loops. In the prior art, a capacitive sensing system includes a driving ring, a sensor board, and a capacitance detecting circuit. By applying an excitation on the drive ring, the drive ring directly contacts the finger, and the drive ring is energized to the finger to drive the finger potential to change. This solution, on the one hand, requires the addition of a drive ring, which increases the cost; on the other hand, the drive ring cannot apply too high voltage, such as 4V. When the voltage is too high, current flowing through the human body can cause an uncomfortable feeling. Generally, the higher the voltage, the greater the signal energy, and the higher the signal-to-noise ratio of the received signal, the better the system performance. This solution limits the performance of the entire system solution. In contrast, the capacitive sensing system 10 of the present invention is relatively flexible in design, has better performance, lower cost, and has a higher comfort when the human body is in contact.
需要说明的是，上述利用电容式感测***10中本身导电元件复用屏蔽电极17的技术方案也并不局限于节省驱动环的电容式感测***10中，也可适用其它合适的电容式感测***中，如带有驱动环的这种电容式感测***中，对于本领域的一般技术人员而言，其根据本发明的指导、教导是可以合理推出相关的技术方案的，应均属于本发明所揭示的保护范围。It should be noted that the above-mentioned technical solution of multiplexing the shielding electrode 17 by using the conductive element in the capacitive sensing system 10 is not limited to the capacitive sensing system 10 for saving the driving ring, and other suitable capacitive methods are also applicable. In a sensing system, such as a capacitive sensing system with a driving ring, it will be possible for a person of ordinary skill in the art to rationally introduce a related technical solution according to the teachings and teachings of the present invention. It belongs to the scope of protection disclosed in the present invention.
请参阅图13，图13为本发明电子设备100的另一结构示意图。所述电子设备100进一步包括显示装置50、控制按钮60、壳体70。所述电容式感测***10或者设置于所述显示装置50的显示区域中，或者设置于所述控制按钮60下方，或者设置于所述壳体70内。Please refer to FIG. 13. FIG. 13 is another schematic structural diagram of an electronic device 100 according to the present invention. The electronic device 100 further includes a display device 50, a control button 60, and a housing 70. The capacitive sensing system 10 is disposed in the display area of the display device 50 or disposed under the control button 60 or in the housing 70.
(一)此外，可变更地，也可在所述电源端加载第一调制信号，所述接地端对应施加有随第一调制信号变化而变化的信号，同样可解决所述寄生电容的影响。(1) In addition, the first modulation signal may be loaded on the power supply end, and the ground end is correspondingly applied with a signal that changes according to the change of the first modulation signal, and the influence of the parasitic capacitance can also be solved.
(二)另外，在有的电容检测电路中，还存在参考电压端。所述参 考电压端加载第三电源信号，且第三电源信号的电压介于所述第一电源信号的电压与第二电源信号的电压之间。(2) In addition, in some capacitance detecting circuits, there is also a reference voltage terminal. The reference The test voltage terminal loads the third power signal, and the voltage of the third power signal is between the voltage of the first power signal and the voltage of the second power signal.
类似地，也可在所述参考电压端加载第一调制信号，所述接地端施加有随第一调制信号变化而变化的信号，同样可解决所述寄生电容的影响。Similarly, the first modulation signal may also be applied to the reference voltage terminal, and the ground terminal is applied with a signal that changes according to the change of the first modulation signal, and the influence of the parasitic capacitance can also be solved.
(三)类似地，也可在电容式感测***的电容检测电路中的其它某一端口加载所述第一调制信号，所述接地端施加有随第一调制信号变化而变化的信号，同样可解决所述寄生电容的影响。(3) Similarly, the first modulation signal may also be loaded on some other port in the capacitance detecting circuit of the capacitive sensing system, and the ground terminal is applied with a signal that changes according to the change of the first modulation signal, and the same The effect of the parasitic capacitance can be solved.
鉴于上述(一)(二)(三)，定义电容检测电路存在一调制端，此调制端加载随所述随时间变化的第一调制信号，所述调制端或为接地端，或为其它端口，当为其它端口时，所述接地端的电压随所述第一调制信号的变化而对应变化。In view of the above (1), (2) and (3), the capacitance detecting circuit is defined to have a modulation end, and the modulation end is loaded with the first modulation signal which changes with time, and the modulation end is either grounded or other port. When it is another port, the voltage of the ground terminal changes correspondingly with the change of the first modulation signal.
对应地，本发明进一步提供另一种电容式感测***以及具有所述电容式感测***的电子设备。此处所述的电容式感测***、电子设备与上述电容式感测***10、电子设备100类似，因此，为了简便说明，关于此处的电容式感测***、电子设备的说明未配有相关附图，下述内容涉及的电容式感测***以及电子设备中与电容式感测***10、电子设备100中名称相同的元件可同样参考附图1-13。Correspondingly, the present invention further provides another capacitive sensing system and an electronic device having the capacitive sensing system. The capacitive sensing system and the electronic device described herein are similar to the capacitive sensing system 10 and the electronic device 100 described above. Therefore, for the sake of simplicity, the descriptions of the capacitive sensing system and the electronic device herein are not provided. In the related embodiments, the capacitive sensing system and the electronic device having the same names as those in the capacitive sensing system 10 and the electronic device 100 can be similarly referred to FIGS. 1-13.
所述电容式感测***包括：The capacitive sensing system includes:
传感器板，用于以电容耦合方式耦合到目标物体来执行感测操作；a sensor board for coupling to a target object in a capacitive coupling manner to perform a sensing operation;
电容检测电路，所述电容检测电路包括信号传输端和调制端，所述电容检测电路用于通过所述信号传输端提供第一激励信号给所述传感器板，以驱动所述传感器板执行感测操作，所述电容检测电路的调制端用于加载第一调制信号，所述第一激励信号随所述第一调制信号的变化而变化。a capacitance detecting circuit, the capacitance detecting circuit includes a signal transmitting end and a modulation end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform sensing Operation, the modulation end of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal changes according to a change of the first modulation signal.
其中，所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述传感器板与所述调制端之间寄生电容的充放电电量。The first excitation signal varies with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the modulation end.
进一步地，所述电容检测电路中的其它电压均随所述调制端的电 压的变化而变化。优选地，所述电容检测电路中的其它电压均随所述调制端的电压的升高而升高、随所述调制端的电压的降低而降低。Further, other voltages in the capacitance detecting circuit are electrically connected to the modulation end The change in pressure changes. Preferably, the other voltages in the capacitance detecting circuit increase as the voltage of the modulation terminal increases, and decrease as the voltage of the modulation terminal decreases.
优选地，所述第一调制信号与所述第一激励信号为电压信号，所述第一激励信号的电压随所述第一调制信号的电压的升高而升高、随所述第一调制信号的电压的降低而降低。Preferably, the first modulation signal and the first excitation signal are voltage signals, and a voltage of the first excitation signal increases as a voltage of the first modulation signal increases, along with the first modulation The voltage of the signal is lowered and lowered.
更优选地，所述第一激励信号的幅度变化大小与所述第一调制信号的幅度变化大小对应相同。优选地，所述第一激励信号与所述第一调制信号为周期性变化的信号。More preferably, the magnitude of the amplitude change of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal. Preferably, the first excitation signal and the first modulation signal are periodically varying signals.
更优选地，所述第一激励信号与所述第一调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第一激励信号的相位相对第一调制信号的相位具有一定的延迟。More preferably, the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and The phase of the first excitation signal has a certain delay relative to the phase of the first modulated signal.
所述电容检测电路包括电源端、接地端，所述接地端用于加载第一电源信号，所述电源端用于加载第二电源信号，第二电源信号与第一电源信号之间的电压差为所述电容检测电路工作的电源电压。The capacitance detecting circuit includes a power terminal and a ground terminal, wherein the ground terminal is configured to load a first power signal, and the power terminal is configured to load a second power signal, and a voltage difference between the second power signal and the first power signal A supply voltage that operates for the capacitance sensing circuit.
在一实施方式中，所述调制端为所述电源端与所述接地端二者中之一者，其中：In an embodiment, the modulation end is one of the power terminal and the ground terminal, wherein:
当所述电源端为所述调制端时，所述第二电源信号包括所述第一调制信号，所述第一电源信号随所述第二电源信号的变化而变化；或When the power terminal is the modulation terminal, the second power signal includes the first modulation signal, and the first power signal changes according to a change of the second power signal; or
当所述接地端为所述调制端时，所述第一电源信号包括所述第一调制信号，所述第二电源信号的电压随所述第一电源信号的电压升高而升高、随所述第一电源信号的电压降低而降低。When the ground terminal is the modulation end, the first power signal includes the first modulation signal, and the voltage of the second power signal increases as the voltage of the first power signal increases, The voltage of the first power signal decreases and decreases.
所述电容检测电路进一步包括参考电压端，所述参考电压端用于加载第三电源信号，所述第三电源信号的电压介于所述第二电源信号的电压与第一电源信号的电压之间。The capacitance detecting circuit further includes a reference voltage terminal, wherein the reference voltage terminal is configured to load a third power signal, and the voltage of the third power signal is between the voltage of the second power signal and the voltage of the first power signal between.
在另一实施方式中，所述调制端为所述电源端、所述接地端、所述参考电压端三者中之一者，其中：In another embodiment, the modulation end is one of the power terminal, the ground terminal, and the reference voltage terminal, wherein:
当所述电源端为所述调制端时，所述第二电源信号包括所述第一调制信号，所述第一电源信号、第三电源信号均随所述第二电源信号的变化而变化；或 When the power terminal is the modulation terminal, the second power signal includes the first modulation signal, and the first power signal and the third power signal all change according to a change of the second power signal; Or
当所述接地端为所述调制端时，所述第一电源信号包括所述第一调制信号，所述第二电源信号、第三电源信号均随所述第一电源信号的变化而变化；或When the ground terminal is the modulation end, the first power signal includes the first modulation signal, and the second power signal and the third power signal all change according to a change of the first power signal; or
当所述参考电压端为所述调制端时，所述第三电源信号包括所述第一调制信号，所述第一电源信号、第二电源信号均随所述第三电源信号的变化而变化。When the reference voltage terminal is the modulation end, the third power signal includes the first modulation signal, and the first power signal and the second power signal all change according to the change of the third power signal. .
所述第一调制信号至少包括第一电平与第二电平，所述第一电平的电压不同于所述第二电平的电压。The first modulated signal includes at least a first level and a second level, the voltage of the first level being different from the voltage of the second level.
所述电容式感测***除用于在所述调制端加载第一调制信号时、提供第一激励信号驱动所述传感器板来执行第一检测模式外，还进一步用于在所述调制端加载第二调制信号时，提供第二激励信号驱动所述传感器板来执行第二检测模式，其中，第一调制信号不同于第二调制信号、第一激励信号不同于第二激励信号。The capacitive sensing system is further configured to load at the modulation end, in addition to providing a first excitation signal to drive the sensor board to perform a first detection mode when the modulation end is loaded with the first modulation signal, When the second modulation signal is provided, the second excitation signal is provided to drive the sensor board to perform a second detection mode, wherein the first modulation signal is different from the second modulation signal, and the first excitation signal is different from the second excitation signal.
其中，所述第二激励信号随所述第二调制信号的变化而变化，用以减小所述传感器板与所述接地端之间寄生电容的充放电电量。The second excitation signal varies with the change of the second modulation signal to reduce the charge and discharge power of the parasitic capacitance between the sensor board and the ground.
优选地，所述第二调制信号与所述第二激励信号为电压信号，所述第二激励信号的电压随所述第二调制信号的电压的升高而升高、随所述第二调制信号的电压的降低而降低。Preferably, the second modulation signal and the second excitation signal are voltage signals, and a voltage of the second excitation signal increases as a voltage of the second modulation signal increases, and the second modulation The voltage of the signal is lowered and lowered.
更优选地，所述第二激励信号的幅度变化大小与所述第二调制信号的幅度变化大小对应相同。More preferably, the magnitude of the amplitude change of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
优选地，所述第二激励信号与所述第二调制信号为周期性变化的信号。Preferably, the second excitation signal and the second modulation signal are periodically varying signals.
更优选地，所述第二激励信号与所述第二调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第二激励信号的相位相对第二调制信号的相位具有一定的延迟。More preferably, the second excitation signal and the second modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and The phase of the second excitation signal has a certain delay relative to the phase of the second modulation signal.
其中，在一实施方式中，所述第一检测模式与所述第二检测模式中一种为指纹检测模式，另一种为触摸检测模式，其中，当所述电容式感测***处于触摸检测模式时，所述电容检测电路用于驱动所述传感器板执行触摸检测操作，感测是否有目标物体对所述传感器板进行 触摸；当所述电容式感测***处于指纹检测模式时，所述电容检测电路用于驱动所述传感器板执行指纹检测操作，感测目标物体的指纹是否为预设指纹。In one embodiment, one of the first detection mode and the second detection mode is a fingerprint detection mode, and the other is a touch detection mode, wherein when the capacitive sensing system is in touch detection In the mode, the capacitance detecting circuit is configured to drive the sensor board to perform a touch detecting operation, and sense whether a target object performs the sensor board Touching; when the capacitive sensing system is in the fingerprint detecting mode, the capacitance detecting circuit is configured to drive the sensor board to perform a fingerprint detecting operation, and sense whether the fingerprint of the target object is a preset fingerprint.
所述电容检测电路用于对所述传感器板执行自电容检测。The capacitance detecting circuit is configured to perform self-capacitance detection on the sensor board.
所述第二调制信号包括第四电平与第五电平，所述第四电平的电压不同于所述第五电平的电压。The second modulation signal includes a fourth level and a fifth level, the voltage of the fourth level being different from the voltage of the fifth level.
第一调制信号与第二调制信号均为周期性变化的信号，其中，第一调制信号的频率大于第二调制信号的频率。所述第一激励信号与第二激励信号均为周期性变化的信号，其中，第一激励信号的频率大于第二激励信号的频率。The first modulated signal and the second modulated signal are both periodically varying signals, wherein the frequency of the first modulated signal is greater than the frequency of the second modulated signal. The first excitation signal and the second excitation signal are both periodically varying signals, wherein the frequency of the first excitation signal is greater than the frequency of the second excitation signal.
第一调制信号的第一电平与第二电平的电压峰峰值大于第二调制信号的第四电平与第五电平的电压峰峰值。第一激励信号的电压峰峰值大于第二激励信号的电压峰峰值。The voltage peak-to-peak value of the first level and the second level of the first modulation signal is greater than the voltage peak-to-peak value of the fourth level and the fifth level of the second modulation signal. The voltage peak-to-peak value of the first excitation signal is greater than the voltage peak-to-peak value of the second excitation signal.
所述电容检测电路通过量测传感器板与目标物体之间的电容来感测触摸操作，所述电容检测电路判断所述传感器板是否被触摸；The capacitance detecting circuit senses a touch operation by measuring a capacitance between the sensor board and the target object, and the capacitance detecting circuit determines whether the sensor board is touched;
若是，则切换提供第二调制信号为第一调制信号给所述接地端、切换提供第二激励信号为第一激励信号给所述传感器板来执行指纹感测；If yes, switching provides a second modulated signal to the ground, and provides a second excitation signal as a first excitation signal to the sensor board to perform fingerprint sensing;
若否，则提供第二调制信号给所述接地端、提供第二激励信号给所述传感器板，执行触摸检测。从而，可以先执行触摸感测，再根据是否有触摸操作来决定是否执行指纹感测，进而节省功耗。If not, providing a second modulated signal to the ground, providing a second excitation signal to the sensor board, performing touch detection. Therefore, the touch sensing can be performed first, and then whether the fingerprint sensing is performed according to whether there is a touch operation, thereby saving power consumption.
所述电容式感测***进一步包括控制电路，所述控制电路与所述电源端、接地端分别连接，用于为所述电源端提供所述第二电源信号，为所述接地端提供第一电源信号。所述电容式感测***为节省驱动环的指纹感测***。The capacitive sensing system further includes a control circuit, and the control circuit is respectively connected to the power terminal and the ground terminal, and is configured to provide the second power signal to the power terminal to provide a first Power signal. The capacitive sensing system is a fingerprint sensing system that saves a drive loop.
所述传感器板包括多个电容感测极板，所述电容检测电路通过量测所述多个电容感测极板与目标物体之间的电容大小来执行来感测操作，获得目标物体的预定信息。The sensor board includes a plurality of capacitive sensing plates, and the capacitance detecting circuit performs a sensing operation by measuring a capacitance between the plurality of capacitive sensing plates and a target object to obtain a predetermined target object. information.
所述预定信息包括生物特征信息和/或触摸操作信息。 The predetermined information includes biometric information and/or touch operation information.
所述生物特征信息包括指纹、掌纹。The biometric information includes a fingerprint and a palm print.
所述触摸操作信息为所述传感器板是否有被接近或触摸的操作信息。The touch operation information is operation information of whether the sensor board is approached or touched.
优选地，所述电容式感测***进一步包括屏蔽电极，所述屏蔽电极至少设置于所述传感器板的周围。Preferably, the capacitive sensing system further comprises a shielding electrode, the shielding electrode being disposed at least around the sensor board.
所述屏蔽电极电连接至所述调制端，所述屏蔽电极接收所述第一电源信号。The shield electrode is electrically connected to the modulation end, and the shield electrode receives the first power signal.
所述电容式感测***进一步包括散热板，所述散热板用于对所述电容式感测***进行散热，所述散热板还用于作为所述屏蔽电极。The capacitive sensing system further includes a heat dissipation plate for dissipating heat from the capacitive sensing system, and the heat dissipation plate is also used as the shielding electrode.
需要说明的是，此处所述的电容感测***与上述电容感测***10的主要区别在于：所述调制端并不限于所述接地端13a、也可能是电源端13b、参考电压端、或者其它端口。而对于其它结构，此处所述电容感测***可与上述电容感测***10相同或者不同均可。It should be noted that the main difference between the capacitive sensing system and the capacitive sensing system 10 is that the modulation terminal is not limited to the ground terminal 13a, but also may be the power terminal 13b and the reference voltage terminal. Or other ports. For other configurations, the capacitive sensing system described herein may be the same as or different from the capacitive sensing system 10 described above.
请参阅图14，图14为本发明电容式感测***的检测方法流程图。所述检测方法适用于上述各实施方式所述的电容式感测***，然，也适用其它合适类型的电容式感测***，本发明并不做具体限制。所述电容式感测***包括多个电容感测极板和电容检测电路，所述电容检测电路包括调制端，所述检测方法包括：Please refer to FIG. 14. FIG. 14 is a flow chart of a method for detecting a capacitive sensing system according to the present invention. The detection method is applicable to the capacitive sensing system described in the above embodiments. However, other suitable types of capacitive sensing systems are also applicable, and the present invention is not specifically limited. The capacitive sensing system includes a plurality of capacitive sensing plates and a capacitance detecting circuit, and the capacitance detecting circuit includes a modulation end, and the detecting method includes:
S1:提供第一激励信号给所述多个电容感测极板，驱动所述多个电容感测极板执行感测操作；S1: providing a first excitation signal to the plurality of capacitive sensing plates, and driving the plurality of capacitive sensing plates to perform a sensing operation;
S2:提供第一调制信号给所述调制端，其中，所述第一激励信号随所述第一调制信号的变化而变化。S2: providing a first modulation signal to the modulation end, wherein the first excitation signal changes according to a change of the first modulation signal.
需要说明的是，所述多个电容感测极板用于以电容方式耦合到目标物体，通过执行感测操作，以获得所述目标物体的预定信息。It should be noted that the plurality of capacitive sensing plates are used to capacitively couple to a target object, and perform sensing operations to obtain predetermined information of the target object.
优选地，所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述多个电容感测极板与所述调制端之间寄生电容的充放电电量。Preferably, the first excitation signal varies with the change of the first modulation signal to reduce the charge and discharge power of the parasitic capacitance between the plurality of capacitive sensing plates and the modulation end.
进一步地，所述电容检测电路中的其它电压均随所述第一调制信号的电压的变化而变化。 Further, other voltages in the capacitance detecting circuit change with a change in voltage of the first modulation signal.
优选地，所述第一调制信号与所述第一激励信号为电压信号，所述第一激励信号的电压随所述第一调制信号的电压的升高而升高、随所述第一调制信号的电压的降低而降低。Preferably, the first modulation signal and the first excitation signal are voltage signals, and a voltage of the first excitation signal increases as a voltage of the first modulation signal increases, along with the first modulation The voltage of the signal is lowered and lowered.
更优选地，所述第一激励信号的幅度变化大小与所述第一调制信号的幅度变化大小对应相同。More preferably, the magnitude of the amplitude change of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal.
优选地，所述第一激励信号与所述第一调制信号为周期性变化的信号。Preferably, the first excitation signal and the first modulation signal are periodically varying signals.
更优选地，所述第一激励信号与所述第一调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第一激励信号的相位相对第一调制信号的相位具有一定的延迟。More preferably, the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and The phase of the first excitation signal has a certain delay relative to the phase of the first modulated signal.
所述检测方法进一步包括：The detecting method further includes:
提供第二激励信号给所述多个电容感测极板执行感测操作；Providing a second excitation signal to perform sensing operations on the plurality of capacitive sensing plates;
提供第二调制信号给所述调制端，其中，所述第二激励信号随所述第二调制信号的变化而变化。所述第二激励信号不同于所述第一激励信号，所述第二调制信号不同于所述第一调制信号。从而，驱动所述电容式感测***执行两种不同检测模式，分别为第一检测模式与第二检测模式。具体地，第一检测模式对应提供第一激励信号给所述多个电容感测极板，提供第一调制信号给所述调制端；第二检测模式对应提供第二激励信号给所述多个电容感测极板，提供第二调制信号给所述调制端。相应地，使得所述电容式感测***增加感测功能。A second modulated signal is provided to the modulation terminal, wherein the second excitation signal changes as the second modulation signal changes. The second excitation signal is different from the first excitation signal, and the second modulation signal is different from the first modulation signal. Thus, the capacitive sensing system is driven to perform two different detection modes, a first detection mode and a second detection mode, respectively. Specifically, the first detection mode provides a first excitation signal to the plurality of capacitive sensing plates, and provides a first modulation signal to the modulation end; and the second detection mode provides a second excitation signal to the plurality of The capacitive sensing plate provides a second modulated signal to the modulation terminal. Accordingly, the capacitive sensing system is caused to increase the sensing function.
优选地，所述第二激励信号随所述第二调制信号的变化而变化，用以减小所述多个电容感测极板与所述调制端之间寄生电容的充放电电量。Preferably, the second excitation signal varies with the change of the second modulation signal to reduce the charge and discharge power of the parasitic capacitance between the plurality of capacitive sensing plates and the modulation end.
优选地，所述第二调制信号与所述第二激励信号为电压信号，所述第二激励信号的电压随所述第二调制信号的电压的升高而升高、随所述第二调制信号的电压的降低而降低。Preferably, the second modulation signal and the second excitation signal are voltage signals, and a voltage of the second excitation signal increases as a voltage of the second modulation signal increases, and the second modulation The voltage of the signal is lowered and lowered.
更优选地，所述第二激励信号的幅度变化大小与所述第二调制信号的幅度变化大小对应相同。More preferably, the magnitude of the amplitude change of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
优选地，所述第二激励信号与所述第二调制信号为周期性变化的 信号。Preferably, the second excitation signal and the second modulation signal are periodically changed signal.
更优选地，所述第二激励信号与所述第二调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第二激励信号的相位相对第二调制信号的相位具有一定的延迟。More preferably, the second excitation signal and the second modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals, or co-channel signals, and The phase of the second excitation signal has a certain delay relative to the phase of the second modulation signal.
优选地，第二检测模式较第一检测模式省电，在检测时，先驱动所述电容式感测***执行第二检测模式，在第二检测模式下，感测到目标物体的预定操作之后，再启动第一检测模式或切换第二检测模式为第一检测模式，从而节省电能。Preferably, the second detection mode saves power compared to the first detection mode, and when detecting, first drives the capacitive sensing system to perform a second detection mode, and in the second detection mode, after sensing a predetermined operation of the target object And then restarting the first detection mode or switching the second detection mode to the first detection mode, thereby saving power.
为了节省功耗，优选地，第一调制信号的频率大于第二调制信号的频率；或/和In order to save power consumption, preferably, the frequency of the first modulated signal is greater than the frequency of the second modulated signal; or/and
第一调制信号的电压峰峰值大于第二调制信号的电压峰峰值。The voltage peak-to-peak value of the first modulation signal is greater than the voltage peak-to-peak value of the second modulation signal.
例如，所述检测方法提供第一激励信号给所述多个电容感测极板，用于驱动所述多个电容感测极板执行指纹感测操作；提供第二激励信号给所述多个电容感测极板，用于驱动所述多个电容感测极板执行触摸操作。For example, the detecting method provides a first excitation signal to the plurality of capacitive sensing plates for driving the plurality of capacitive sensing plates to perform a fingerprint sensing operation; providing a second excitation signal to the plurality of And a capacitive sensing plate for driving the plurality of capacitive sensing plates to perform a touch operation.
具体地，所述检测方法通过量测所述多个电容感测极板与目标物体之间的电容来感测目标物体的触摸操作，判断所述多个电容感测极板是否被目标物体触摸；Specifically, the detecting method senses a touch operation of the target object by measuring a capacitance between the plurality of capacitive sensing plates and the target object, and determines whether the plurality of capacitive sensing plates are touched by the target object. ;
若是，则切换提供第二调制信号为第一调制信号给所述接地端、切换提供第二激励信号为第一激励信号给传感器板，来执行指纹感测；If yes, switching to provide the second modulated signal to the ground, switching to provide the second excitation signal as the first excitation signal to the sensor board, to perform fingerprint sensing;
若否，则提供第二调制信号给所述接地端、提供第二激励信号给所述传感器板，来执行触摸感测。If not, providing a second modulated signal to the ground, providing a second excitation signal to the sensor board to perform touch sensing.
其中，执行触摸检测时，第一激励信号的电压峰峰值为10V，频率为1MHz，对应地，第一调制信号的电压峰峰值为10V，频率为1MHz；相对地，第二激励信号的电压峰峰值为1V，频率为100KHz，对应地，第二调制信号的电压峰峰值为1V，频率为100KHz。可见，触摸检测模式下电容式感测***消耗的电能小于指纹检测模式电容式感测***消耗的电能，从而通过先执行触摸检测再执行指纹检测来 降低电容式感测***的功耗。Wherein, when the touch detection is performed, the voltage peak-to-peak value of the first excitation signal is 10V, and the frequency is 1 MHz. Correspondingly, the voltage peak-to-peak value of the first modulation signal is 10V, and the frequency is 1 MHz; relatively, the voltage peak of the second excitation signal The peak value is 1V and the frequency is 100KHz. Correspondingly, the voltage peak-to-peak value of the second modulation signal is 1V and the frequency is 100KHz. It can be seen that the capacitive sensing system consumes less power than the fingerprint detection mode capacitive sensing system in the touch detection mode, thereby performing fingerprint detection by performing touch detection first. Reduce the power consumption of capacitive sensing systems.
所述电容式感测***进一步包括屏蔽电极，所述屏蔽电极至少设置在所述多个电容感测极板的***，优选地，所述检测方法进一步包括：The capacitive sensing system further includes a shielding electrode, and the shielding electrode is disposed at least on a periphery of the plurality of capacitive sensing plates. Preferably, the detecting method further comprises:
提供所述第一调制信号给所述屏蔽电极。从而可以提高所述多个电容感测极板所获得的目标物体的预定信息的准确度。Providing the first modulated signal to the shield electrode. Thereby, the accuracy of the predetermined information of the target object obtained by the plurality of capacitive sensing plates can be improved.
优选地，所述检测方法通过量测所述多个电容感测极板与目标物体之间的电容，来感测目标物体的预定信息。Preferably, the detecting method senses predetermined information of the target object by measuring capacitance between the plurality of capacitive sensing plates and the target object.
所述预定信息包括目标物体的生物特征信息和/或触摸操作信息。The predetermined information includes biometric information and/or touch operation information of the target object.
其中，所述生物特征信息为指纹信息。The biometric information is fingerprint information.
其中，所述触摸操作信息为是否有目标物体接近或触摸所述多个电容感测极板。The touch operation information is whether a target object approaches or touches the plurality of capacitive sensing plates.
更优选地，所述检测方法通过量测所述多个电容感测极板与目标物体之间的自电容，来感测目标物体的预定信息。More preferably, the detecting method senses predetermined information of the target object by measuring self-capacitance between the plurality of capacitive sensing plates and the target object.
所述电容检测电路包括接地端与电源端，所述检测方法进一步包括：The capacitance detecting circuit includes a ground end and a power end, and the detecting method further includes:
提供第一电源信号给所述接地端；Providing a first power signal to the ground terminal;
提供第二电源信号给所述电源端，所述第二电源信号与所述第一电源信号的电压差为所述电容检测电路工作的电源电压。And providing a second power signal to the power terminal, wherein a voltage difference between the second power signal and the first power signal is a power voltage of the capacitor detecting circuit.
在一实施方式中，所述调制端为所述电源端与所述接地端二者中之一者，其中：In an embodiment, the modulation end is one of the power terminal and the ground terminal, wherein:
当所述电源端为所述调制端时，所述第二电源信号包括所述第一调制信号，所述第一电源信号的电压随所述第二电源信号的电压的升高而升高、随所述第二电源信号的电压的降低而降低；或When the power terminal is the modulation terminal, the second power signal includes the first modulation signal, and a voltage of the first power signal increases as a voltage of the second power signal increases Decreasing as the voltage of the second power signal decreases; or
当所述接地端为所述调制端时，所述第一电源信号包括所述第一调制信号，所述第二电源信号的电压随所述第一电源信号的电压升高而升高、随所述第一电源信号的电压降低而降低。When the ground terminal is the modulation end, the first power signal includes the first modulation signal, and the voltage of the second power signal increases as the voltage of the first power signal increases, The voltage of the first power signal decreases and decreases.
所述电容检测电路进一步包括参考电压端，所述检测方法进一步 包括：The capacitance detecting circuit further includes a reference voltage terminal, and the detecting method further include:
提供第三电源信号给所述参考电压端，所述第三电源信号的电压介于所述第二电源信号的电压与第一电源信号的电压之间。And providing a third power signal to the reference voltage terminal, wherein a voltage of the third power signal is between a voltage of the second power signal and a voltage of the first power signal.
在另一实施方式中，所述调制端为所述电源端、所述接地端、所述参考电压端三者中之一者：In another embodiment, the modulation end is one of the power terminal, the ground terminal, and the reference voltage terminal:
当所述电源端为所述调制端时，所述第二电源信号包括所述第一调制信号，所述第一电源信号、第三电源信号的电压均随所述第二电源信号的电压的升高而升高、随所述第二电源信号的电压的降低而降低；或When the power terminal is the modulation terminal, the second power signal includes the first modulation signal, and voltages of the first power signal and the third power signal are all related to a voltage of the second power signal Raising and rising, decreasing as the voltage of the second power signal decreases; or
当所述接地端为所述调制端时，所述第一电源信号包括所述第一调制信号，所述第二电源信号、第三电源信号的电压均随所述第一电源信号的电压的升高而升高、随所述第一电源信号的电压的降低而降低；或When the ground terminal is the modulation end, the first power signal includes the first modulation signal, and the voltages of the second power signal and the third power signal are all related to a voltage of the first power signal Raising and rising, decreasing as the voltage of the first power signal decreases; or
当所述参考电压端为所述调制端时，所述第三电源信号包括所述第一调制信号，所述第一电源信号、第二电源信号的电压均随所述第三电源信号的电压的升高而升高、随所述第三电源信号的电压的降低而降低。When the reference voltage terminal is the modulation end, the third power signal includes the first modulation signal, and the voltages of the first power signal and the second power signal are all related to the voltage of the third power signal The rise is increased and decreases as the voltage of the third power signal decreases.
优选地，上述调制端为接地端。Preferably, the modulation end is a ground terminal.
本发明上述检测方法可使得所述调制端与所述多个电容感测极板之间的寄生电容的等效电容变小，从而提高感测精度。另外，通过先执行触摸感测，再决定是否执行指纹感测，从而还可进一步减小电容式感测***的功耗。The above detection method of the present invention can make the equivalent capacitance of the parasitic capacitance between the modulation end and the plurality of capacitance sensing plates smaller, thereby improving the sensing accuracy. In addition, by performing touch sensing first, it is determined whether or not fingerprint sensing is performed, so that the power consumption of the capacitive sensing system can be further reduced.
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。 The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims (127)

  1. 一种电容式感测***，包括：A capacitive sensing system comprising:
    传感器板，用于以电容方式耦合到目标物体来执行感测操作；a sensor board for capacitively coupling to a target object to perform a sensing operation;
    电容检测电路，所述电容检测电路包括信号传输端和接地端，所述电容检测电路用于通过所述信号传输端提供第一激励信号给传感器板，以驱动传感器板执行感测操作，所述电容检测电路的接地端用于加载第一调制信号，所述第一激励信号随第一调制信号的变化而变化。a capacitance detecting circuit, the capacitance detecting circuit includes a signal transmitting end and a ground end, wherein the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end to drive the sensor board to perform a sensing operation, The ground of the capacitance detecting circuit is used to load a first modulation signal, and the first excitation signal changes as the first modulation signal changes.
  2. 根据权利要求1所述的电容式感测***，其特征在于，所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述传感器板与所述接地端之间寄生电容的充放电电量。The capacitive sensing system of claim 1 wherein said first excitation signal varies with said first modulation signal for reducing said sensor plate to said ground Charge and discharge of parasitic capacitance.
  3. 根据权利要求1所述的电容式感测***，其特征在于，所述第一调制信号与所述第一激励信号为电压信号，所述第一激励信号的电压随所述第一调制信号的电压的升高而升高、随所述第一调制信号的电压的降低而降低。The capacitive sensing system according to claim 1, wherein the first modulation signal and the first excitation signal are voltage signals, and the voltage of the first excitation signal is related to the first modulation signal The voltage rises and rises as the voltage of the first modulated signal decreases.
  4. 根据权利要求3所述的电容式感测***，其特征在于，所述第一激励信号的幅度变化大小与第一调制信号的幅度变化大小对应相同。The capacitive sensing system according to claim 3, wherein the magnitude of the amplitude change of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal.
  5. 根据权利要求1所述的电容式感测***，其特征在于，所述第一激励信号与所述第一调制信号为周期性变化的信号。The capacitive sensing system of claim 1 wherein said first excitation signal and said first modulated signal are periodically varying signals.
  6. 根据权利要求1所述的电容式感测***，其特征在于，所述第一激励信号与所述第一调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第一激励信号的相位相对第一调制信号的相位具有一定的延迟。The capacitive sensing system according to claim 1, wherein the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or are co-channels of the same frequency. The in-phase signal is either an intra-frequency signal and the phase of the first excitation signal has a certain delay relative to the phase of the first modulation signal.
  7. 根据权利要求3所述的电容式感测***，其特征在于，所述接地端用于加载第一电源信号，所述第一电源信号包括所述第一调制信号，所述电容检测电路进一步包括电源端，所述电源端用于加载第二电源信号，第二电源信号的电压高于第一电源信号的电压，所述第二电源信号随所述第一调制信号的变化而变化，或者所述第二电源信号随所述第一电源信号的变化而变化。The capacitive sensing system according to claim 3, wherein the ground terminal is for loading a first power signal, the first power signal comprises the first modulation signal, and the capacitance detecting circuit further comprises a power terminal, wherein the power terminal is configured to load a second power signal, the voltage of the second power signal is higher than a voltage of the first power signal, and the second power signal changes according to the change of the first modulation signal, or The second power signal changes as the first power signal changes.
  8. 根据权利要求7所述的电容式感测***，其特征在于，所述第二 电源信号与所述第一调制信号为同频信号，或者所述第二电源信号与所述第一电源信号为同频信号。The capacitive sensing system of claim 7 wherein said second The power signal is the same frequency signal as the first modulation signal, or the second power signal is the same frequency signal as the first power signal.
  9. 根据权利要求7所述的电容式感测***，其特征在于，所述第一电源信号、所述第二电源信号均为电压信号，所第二电源信号的电压随所述第一调制信号的电压的升高而升高、随所述第一调制信号的电压的降低而降低，或者所第二电源信号的电压随所述第一电源信号的电压的升高而升高、随所述第一电源信号的电压的降低而降低。The capacitive sensing system according to claim 7, wherein the first power signal and the second power signal are voltage signals, and the voltage of the second power signal is associated with the first modulated signal The voltage rises as the voltage rises, decreases as the voltage of the first modulation signal decreases, or the voltage of the second power signal increases as the voltage of the first power signal increases, The voltage of a power supply signal is lowered and lowered.
  10. 根据权利要求7所述的电容式感测***，其特征在于，第二电源信号与第一电源信号之间的电压差为电容检测电路工作的电源电压。The capacitive sensing system according to claim 7, wherein the voltage difference between the second power signal and the first power signal is a power supply voltage at which the capacitance detecting circuit operates.
  11. 根据权利要求10所述的电容式感测***，其特征在于，所述电容检测电路中的电压均随所述第一电源信号的电压的升高而升高、随所述第一电源信号的电压的降低而降低。The capacitive sensing system according to claim 10, wherein a voltage in said capacitance detecting circuit increases with an increase in a voltage of said first power signal, along with said first power signal The voltage is lowered and lowered.
  12. 根据权利要求1所述的电容式感测***，其特征在于，所述第一调制信号至少包括第一电平与第二电平，所述第一电平的电压不同于所述第二电平的电压。The capacitive sensing system of claim 1 wherein said first modulated signal comprises at least a first level and a second level, said first level of voltage being different from said second Flat voltage.
  13. 根据权利要求12所述的电容式感测***，其特征在于，所述第一调制信号包括第一电平与第二电平交替出现的方波信号，其中，所述第一电平与第二电平的电压情况为下述三种情况中的任意一种：The capacitive sensing system according to claim 12, wherein said first modulated signal comprises a square wave signal in which a first level and a second level alternately appear, wherein said first level and said The two-level voltage condition is any of the following three cases:
    第一：第一电平的电压为正电压，第二电平的电压为0伏；First: the voltage of the first level is a positive voltage, and the voltage of the second level is 0 volts;
    第二：第一电平的电压为0伏，第二电平的电压为负电压；Second: the voltage of the first level is 0 volts, and the voltage of the second level is a negative voltage;
    第三：第一电平的电压为正电压，第二电平的电压为负电压，第一电平的电压的绝对值等于或者不等于第二电平的电压的绝对值。Third: the voltage of the first level is a positive voltage, and the voltage of the second level is a negative voltage, and the absolute value of the voltage of the first level is equal to or not equal to the absolute value of the voltage of the second level.
  14. 根据权利要求12所述的电容式感测***，其特征在于，所述电容检测电路在所述接地端的电平为第一电平时，从传感器板读取第一信号，并在所述接地端的电平为第二电平时，从传感器板读取第二信号，通过所述读取的第一信号与第二信号获得目标物体的预定信息。The capacitive sensing system according to claim 12, wherein the capacitance detecting circuit reads the first signal from the sensor board when the level of the ground terminal is at a first level, and is at the ground end When the level is the second level, the second signal is read from the sensor board, and the predetermined information of the target object is obtained by the read first signal and the second signal.
  15. 根据权利要求12所述的电容式感测***，其特征在于，所述第一调制信号进一步包括第三电平，所述第二电平的电压介于第一电平的电压与第三电平的电压之间，所述第一调制信号包括由第一电平、 第二电平、第三电平三者构成的二级阶梯方波信号。The capacitive sensing system according to claim 12, wherein said first modulated signal further comprises a third level, said second level of voltage being between said first level of voltage and said third Between flat voltages, the first modulated signal includes a first level, A two-step square wave signal composed of a second level and a third level.
  16. 根据权利要求15所述的电容式感测***，其特征在于，其中，所述电容检测电路在所述接地端的电平为第一电平时，从所述传感器板读取第一信号，在所述接地端的电平为第二电平时，从所述传感器板读取第二信号，在所述接地端的电平为第三电平时，从所述传感器板读取第三信号，并在所述接地端的电平从第三电平切换为第二电平时，从所述传感器板读取第四信号，通过所述读取的第一信号、第二信号、第三信号与第四信号获得目标物体的预定信息。The capacitive sensing system according to claim 15, wherein the capacitance detecting circuit reads the first signal from the sensor board when the level of the ground is at a first level. When the level of the ground terminal is the second level, the second signal is read from the sensor board, and when the level of the ground terminal is the third level, the third signal is read from the sensor board, and in the When the level of the ground terminal is switched from the third level to the second level, the fourth signal is read from the sensor board, and the target is obtained by the read first signal, the second signal, the third signal, and the fourth signal. The predetermined information of the object.
  17. 根据权利要求1或7所述的电容式感测***，其特征在于，所述电容式感测***进一步包括控制电路，所述电容检测电路的接地端与所述控制电路电连接，所述控制电路用于施加所述第一调制信号到所述电容检测电路的接地端。The capacitive sensing system according to claim 1 or 7, wherein the capacitive sensing system further comprises a control circuit, the ground of the capacitance detecting circuit is electrically connected to the control circuit, and the control A circuit is operative to apply the first modulated signal to a ground of the capacitance detecting circuit.
  18. 根据权利要求17所述的电容式感测***，其特征在于，所述电容检测电路进一步包括电源端，所述电源端与所述控制电路电连接，所述控制电路用于施加第一电源信号给所述接地端，施加第二电源信号给所述电源端。The capacitive sensing system according to claim 17, wherein said capacitance detecting circuit further comprises a power terminal, said power terminal being electrically connected to said control circuit, said control circuit for applying a first power signal A second power signal is applied to the ground terminal to the power terminal.
  19. 根据权利要求18所述的电容式感测***，其特征在于，所述控制电路包括接地端，所述控制电路的接地端的电压为0伏、或者为所述电容式感测***所在的电子设备的***地电压、或者为一电子设备的***地电压、或者为恒定电压。The capacitive sensing system according to claim 18, wherein the control circuit comprises a ground, the voltage of the ground of the control circuit is 0 volts, or the electronic device in which the capacitive sensing system is located The system ground voltage, either the system ground voltage of an electronic device, or a constant voltage.
  20. 根据权利要求1所述的电容式感测***，其特征在于，所述电容式感测***进一步包括屏蔽电极，所述屏蔽电极至少设置于所述传感器板的周围。The capacitive sensing system of claim 1 wherein said capacitive sensing system further comprises a shield electrode, said shield electrode being disposed at least about said sensor panel.
  21. 根据权利要求20所述的电容式感测***，其特征在于，所述屏蔽电极为下述的任意一种情况：The capacitive sensing system according to claim 20, wherein the shield electrode is any one of the following:
    第一，所述屏蔽电极包括多个电极，分布于所述传感器板的周围；First, the shielding electrode includes a plurality of electrodes distributed around the sensor board;
    第二，所述屏蔽电极为中间镂空的电极，所述传感器板对应所述屏蔽电极的镂空区域设置；Second, the shielding electrode is an intermediate hollow electrode, and the sensor board is disposed corresponding to the hollow area of the shielding electrode;
    第三，所述屏蔽电极与所述传感器板层叠设置，且沿垂直层叠的方向， 所述屏蔽电极的周边超出所述传感器板的***。Third, the shielding electrode is stacked with the sensor board, and in a direction of vertical stacking, The periphery of the shield electrode extends beyond the periphery of the sensor board.
  22. 根据权利要求20所述的电容式感测***，其特征在于，所述电容式感测***进一步包括散热板，所述散热板用于对所述电容式感测***进行散热，所述散热板还用于作为所述屏蔽电极。The capacitive sensing system according to claim 20, wherein the capacitive sensing system further comprises a heat dissipation plate for dissipating heat from the capacitive sensing system, the heat dissipation plate Also used as the shield electrode.
  23. 根据权利要求22所述的电容式感测***，其特征在于，所述传感器板与所述散热板层叠设置，沿垂直层叠的方向，所述散热板的***超出所述传感器板的边缘。The capacitive sensing system according to claim 22, wherein the sensor plate is stacked with the heat dissipation plate, and a periphery of the heat dissipation plate extends beyond an edge of the sensor plate in a direction of vertical stacking.
  24. 根据权利要求20或22所述的电容式感测***，其特征在于，所述电容式感测***进一步包括多个引线框，所述屏蔽电极与所述多个引线框位于同一层，由相同材料制成。The capacitive sensing system according to claim 20 or 22, wherein the capacitive sensing system further comprises a plurality of lead frames, the shielding electrodes being in the same layer as the plurality of lead frames, by the same Made of materials.
  25. 根据权利要求20所述的电容式感测***，其特征在于，所述电容检测电路与所述传感器板集成在一电容检测电路芯片中，所述电容式感测***进一步包括基板，所述电容检测电路芯片设置在所述基板上，所述屏蔽电极设置在所述基板上。The capacitive sensing system according to claim 20, wherein said capacitance detecting circuit and said sensor board are integrated in a capacitance detecting circuit chip, said capacitive sensing system further comprising a substrate, said capacitor A detecting circuit chip is disposed on the substrate, and the shielding electrode is disposed on the substrate.
  26. 根据权利要求25所述的电容式感测***，其特征在于，所述基板为印刷电路板或软性电路板。The capacitive sensing system of claim 25 wherein the substrate is a printed circuit board or a flexible circuit board.
  27. 根据权利要求20所述的电容式感测***，其特征在于，所述屏蔽电极由导电材料制成，用于接收电信号。A capacitive sensing system according to claim 20, wherein said shield electrode is made of a conductive material for receiving an electrical signal.
  28. 根据权利要求20所述的电容式感测***，其特征在于，所述屏蔽电极电连接至电容检测电路的接地端，用于接收第一调制信号。The capacitive sensing system according to claim 20, wherein the shield electrode is electrically connected to a ground of the capacitance detecting circuit for receiving the first modulated signal.
  29. 根据权利要求20所述的电容式感测***，其特征在于，所述传感器板包括多个电容感测极板，所述电容检测电路通过量测多个电容感测极板与所述目标物体之间的电容，来获得目标物体的预定信息。The capacitive sensing system of claim 20, wherein the sensor board comprises a plurality of capacitive sensing plates, the capacitance detecting circuit measuring a plurality of capacitive sensing plates and the target object The capacitance between them to obtain the predetermined information of the target object.
  30. 根据权利要求29所述的电容式感测***，其特征在于，所述多个电容感测极板排列成感应阵列，所述屏蔽电极至少设置在所述感应阵列的周围。The capacitive sensing system of claim 29, wherein the plurality of capacitive sensing plates are arranged in an array of sensing, the shielding electrodes being disposed at least around the sensing array.
  31. 根据权利要求1所述的电容式感测***，其特征在于，所述电容检测电路除用于在所述接地端加载所述第一调制信号时、提供所述第一激励信号驱动所述传感器板来执行第一检测模式外，还进一步用于 在所述接地端加载第二调制信号时、提供第二激励信号驱动所述传感器板来执行第二检测模式，其中，第一调制信号不同于第二调制信号，第一激励信号不同于第二激励信号。The capacitive sensing system according to claim 1, wherein said capacitance detecting circuit is configured to provide said first excitation signal to drive said sensor when said first modulation signal is applied to said ground terminal The board is further used for performing the first detection mode And applying a second excitation signal to drive the sensor board to perform a second detection mode when the ground end loads the second modulation signal, wherein the first modulation signal is different from the second modulation signal, and the first excitation signal is different from the second Excitation signal.
  32. 根据权利要求31所述的电容式感测***，其特征在于，所述第二激励信号随所述第二调制信号的变化而变化。The capacitive sensing system of claim 31 wherein said second excitation signal varies as a function of said second modulated signal.
  33. 根据权利要求32所述的电容式感测***，其特征在于，所述第二激励信号随所述第二调制信号的变化而变化，用以减小所述传感器板与所述接地端之间寄生电容的充放电电量。The capacitive sensing system of claim 32, wherein the second excitation signal varies with the change of the second modulation signal to reduce the distance between the sensor board and the ground Charge and discharge of parasitic capacitance.
  34. 根据权利要求32所述的电容式感测***，其特征在于，第二调制信号与第二激励信号为电压信号，第二激励信号的电压随第二调制信号的电压的升高而升高、随第二调制信号的电压的降低而降低。The capacitive sensing system according to claim 32, wherein the second modulation signal and the second excitation signal are voltage signals, and the voltage of the second excitation signal increases as the voltage of the second modulation signal increases. Decreased as the voltage of the second modulated signal decreases.
  35. 根据权利要求34所述的电容式感测***，其特征在于，第二激励信号的幅度变化大小与第二调制信号的幅度变化大小对应相同。The capacitive sensing system according to claim 34, wherein the magnitude of the amplitude variation of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
  36. 根据权利要求32所述的电容式感测***，其特征在于，所述第二激励信号与所述第二调制信号为周期性变化的信号。A capacitive sensing system according to claim 32, wherein said second excitation signal and said second modulation signal are periodically varying signals.
  37. 根据权利要求36所述的电容式感测***，其特征在于，所述第二激励信号与所述第二调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第二激励信号的相位相对第二调制信号的相位具有一定的延迟。The capacitive sensing system according to claim 36, wherein the second excitation signal and the second modulation signal are either co-frequency signals, or co-channel in-phase signals, or are co-frequency in-situ. The in-phase signal is either an intra-frequency signal and the phase of the second excitation signal has a certain delay relative to the phase of the second modulation signal.
  38. 根据权利要求31所述的电容式感测***，其特征在于，所述第二调制信号至少包括第四电平与第五电平，其中，第四电平的电压不同于第五电平的电压。The capacitive sensing system according to claim 31, wherein said second modulated signal comprises at least a fourth level and a fifth level, wherein the voltage of the fourth level is different from the fifth level Voltage.
  39. 根据权利要求31所述的电容式感测***，其特征在于，第一检测模式为指纹感测模式，第二检测模式为触摸检测模式，其中，当所述电容式感测***处于触摸检测模式时，所述电容检测电路用于驱动所述传感器板执行触摸检测操作，感测目标物体对所述传感器板的触摸；当所述电容式感测***处于指纹检测模式时，所述电容检测电路用于驱动所述传感器板执行指纹检测操作，感测目标物体的指纹。The capacitive sensing system according to claim 31, wherein the first detection mode is a fingerprint sensing mode, and the second detection mode is a touch detection mode, wherein when the capacitive sensing system is in a touch detection mode The capacitance detecting circuit is configured to drive the sensor board to perform a touch detecting operation, and sense a touch of the target object on the sensor board; when the capacitive sensing system is in a fingerprint detecting mode, the capacitance detecting circuit And driving the sensor board to perform a fingerprint detecting operation to sense a fingerprint of the target object.
  40. 根据权利要求31-39中任意一项所述的电容式感测***，其特征 在于，第一调制信号与第二调制信号均为周期性变化的信号，其中，第一调制信号的频率大于第二调制信号的频率。Capacitive sensing system according to any one of claims 31-39, characterized in that The first modulated signal and the second modulated signal are both periodically varying signals, wherein the frequency of the first modulated signal is greater than the frequency of the second modulated signal.
  41. 根据权利要求31-39中任意一项所述的电容式感测***，其特征在于，第一调制信号的电压峰峰值大于第二调制信号的电压峰峰值。The capacitive sensing system according to any one of claims 31 to 39, wherein the voltage peak-to-peak value of the first modulation signal is greater than the voltage peak-to-peak value of the second modulation signal.
  42. 根据权利要求31-39中任意一项所述的电容式感测***，其特征在于，第一激励信号与第二激励信号均为周期性变化的信号，其中，第一激励信号的频率大于第二激励信号的频率。The capacitive sensing system according to any one of claims 31 to 39, wherein the first excitation signal and the second excitation signal are both periodically varying signals, wherein the frequency of the first excitation signal is greater than The frequency of the two excitation signals.
  43. 根据权利要求31-39中任意一项所述的电容式感测***，其特征在于，第一激励信号的电压峰峰值大于第二激励信号的电压峰峰值。The capacitive sensing system according to any one of claims 31 to 39, wherein the voltage peak-to-peak value of the first excitation signal is greater than the voltage peak-to-peak value of the second excitation signal.
  44. 根据权利要求39所述的电容式感测***，其特征在于，所述电容检测电路根据所述传感器板是否被触摸，来对应驱动所述传感器板是否执行指纹感测操作；The capacitive sensing system according to claim 39, wherein the capacitance detecting circuit correspondingly drives whether the sensor board performs a fingerprint sensing operation according to whether the sensor board is touched;
    若所述传感器板被触摸，所述电容检测电路则切换提供第二调制信号为第一调制信号给所述接地端、切换提供第二激励信号为第一激励信号给传感器板，用以执行指纹感测；If the sensor board is touched, the capacitance detecting circuit switches to provide a second modulated signal to the ground, and provides a second excitation signal as a first excitation signal to the sensor board for performing fingerprint Sensing;
    若所述传感器板未被触摸，所述电容检测电路提供第二调制信号给所述接地端、提供第二激励信号给所述传感器板，用以执行触摸感测。If the sensor board is not touched, the capacitance detecting circuit provides a second modulation signal to the ground, and provides a second excitation signal to the sensor board for performing touch sensing.
  45. 根据权利要求17所述的电容式感测***，其特征在于，所述电容检测电路集成于一电容检测电路芯片中，所述控制电路集成于一控制电路芯片中，所述电容检测电路芯片和所述控制电路芯片或者封装在一个集成电路封装里，或者分别封装在两个集成电路封装里。The capacitive sensing system according to claim 17, wherein the capacitance detecting circuit is integrated in a capacitance detecting circuit chip, the control circuit is integrated in a control circuit chip, and the capacitance detecting circuit chip and The control circuit chip is either packaged in an integrated circuit package or packaged in two integrated circuit packages.
  46. 根据权利要求45所述的电容式感测***，其特征在于，所述电容式感测***进一步包括屏蔽电极，所述屏蔽电极至少设置于所述传感器板的周围，其中：The capacitive sensing system according to claim 45, wherein said capacitive sensing system further comprises a shield electrode, said shield electrode being disposed at least around said sensor panel, wherein:
    内含所述电容检测电路芯片的集成电路封装包括与所述电容检测电路芯片相连接的引线框，所述屏蔽电极与所述引线框位于同一层，且由相同材料制成；或/和An integrated circuit package including the capacitance detecting circuit chip includes a lead frame connected to the capacitance detecting circuit chip, the shielding electrode is located on the same layer as the lead frame, and is made of the same material; or/and
    内含所述电容检测电路芯片的集成电路封装包括散热板，散热板用于对电容检测电路芯片进行散热，还用于作为所述屏蔽电极；或/和 The integrated circuit package including the capacitance detecting circuit chip includes a heat dissipation plate for dissipating heat from the capacitance detecting circuit chip, and is also used as the shielding electrode; or/and
    内含所述电容检测电路芯片的集成电路封装包括基板，所述电容检测电路芯片设置在所述基板上，所述基板进一步设置所述屏蔽电极。The integrated circuit package including the capacitance detecting circuit chip includes a substrate, and the capacitance detecting circuit chip is disposed on the substrate, and the substrate further sets the shielding electrode.
  47. 根据权利要求1所述的电容式感测***，其特征在于，电容检测电路驱动传感器板执行感测操作，以获得目标物体的预定信息，其中，所述预定信息包括目标物体的生物特征信息和/或触摸操作信息。The capacitive sensing system according to claim 1, wherein the capacitance detecting circuit drives the sensor panel to perform a sensing operation to obtain predetermined information of the target object, wherein the predetermined information includes biometric information of the target object and / or touch the action information.
  48. 根据权利要求47所述的电容式感测***，其特征在于，所述生物特征信息为指纹信息。The capacitive sensing system according to claim 47, wherein the biometric information is fingerprint information.
  49. 根据权利要求47所述的电容式感测***，其特征在于，所述触摸操作信息为是否有目标物体接近或触摸所述传感器板。The capacitive sensing system according to claim 47, wherein the touch operation information is whether a target object approaches or touches the sensor board.
  50. 根据权利要求1所述的电容式感测***，其特征在于，所述电容式感测***为指纹感测***。The capacitive sensing system of claim 1 wherein the capacitive sensing system is a fingerprint sensing system.
  51. 根据权利要求1所述的电容式感测***，其特征在于，所述电容式感测***为节省驱动环的电容式感测***。The capacitive sensing system of claim 1 wherein said capacitive sensing system is a capacitive sensing system that saves drive loops.
  52. 根据权利要求1所述的电容式感测***，其特征在于，所述电容检测电路通过提供所述第一激励信号对所述传感器板进行自电容检测，以实现感测操作。The capacitive sensing system according to claim 1, wherein the capacitance detecting circuit performs self-capacitance detection on the sensor board by providing the first excitation signal to implement a sensing operation.
  53. 根据权利要求1所述的电容式感测***，其特征在于，所述电容式感测***用于感测目标物体为手指的预定信息。The capacitive sensing system of claim 1 wherein said capacitive sensing system is operative to sense predetermined information that the target object is a finger.
  54. 根据权利要求2所述的电容式感测***，其特征在于，所述传感器板包括多个电容感测极板，所述电容检测电路包括多个感测单元和多个选择单元，每一感测单元通过一选择单元与至少一电容感测极板连接，每一感测单元进一步与所述接地端电连接，每一感测单元通过选择单元给所述电容感测极板提供第一激励信号，并接收来自电容感测极板的感测信号，通过所述感测信号获得目标物体的预定信息。The capacitive sensing system according to claim 2, wherein the sensor board comprises a plurality of capacitive sensing plates, the capacitance detecting circuit comprising a plurality of sensing units and a plurality of selecting units, each sense The measuring unit is connected to the at least one capacitive sensing plate through a selection unit, each sensing unit is further electrically connected to the grounding end, and each sensing unit provides a first excitation to the capacitive sensing plate through the selecting unit. And receiving a sensing signal from the capacitive sensing plate, and obtaining predetermined information of the target object by using the sensing signal.
  55. 根据权利要求54所述的电容式感测***，其特征在于，所述选择单元用于选择感测单元与哪些电容感测极板电导通，其中，通过所述多个选择单元，所述电容检测电路同时或分时输出所述第一激励信号给所述多个电容感测极板。The capacitive sensing system according to claim 54, wherein the selecting unit is configured to select which capacitive sensing plates the sensing unit is electrically connected to, wherein the capacitor is passed through the plurality of selecting units The detecting circuit outputs the first excitation signal to the plurality of capacitive sensing plates simultaneously or in a time-sharing manner.
  56. 根据权利要求54所述的电容式感测***，其特征在于，所述感 测单元包括运算放大器和反馈支路，所述运算放大器包括同相端、反相端、和输出端，所述反相端通过一选择单元连接至少一电容感测极板，所述反馈支路连接于反相端与输出端之间，所述运算放大器进一步连接所述接地端。A capacitive sensing system according to claim 54 wherein said sense The measuring unit includes an operational amplifier including a non-inverting terminal, an inverting terminal, and an output terminal, wherein the inverting terminal is connected to the at least one capacitive sensing plate through a selection unit, and the feedback branch is connected The operational amplifier is further connected to the ground terminal between the inverting terminal and the output terminal.
  57. 根据权利要求56所述的电容式感测***，其特征在于，所述运算放大器的同相端接收一参考电压，所述参考电压随所述第一调制信号的电压升高而升高、随所述第一调制信号的电压下降而下降。The capacitive sensing system according to claim 56, wherein the non-inverting terminal of the operational amplifier receives a reference voltage, and the reference voltage rises as the voltage of the first modulated signal rises, The voltage of the first modulation signal decreases and falls.
  58. 根据权利要求57所述的电容式感测***，其特征在于，所述反相端输出所述第一激励信号给所述电容感测极板。The capacitive sensing system of claim 57, wherein the inverting terminal outputs the first excitation signal to the capacitive sensing plate.
  59. 根据权利要求58所述的电容式感测***，其特征在于，所述运算放大器工作时处于虚短状态。The capacitive sensing system of claim 58 wherein said operational amplifier is in a virtual short state when operating.
  60. 根据权利要求58所述的电容式感测***，其特征在于，所述反馈支路包括一反馈电容，所述反馈电容连接于反相端与输出端之间，所述感测单元进一步包括计算单元，所述计算单元与所述输出端连接，所述计算单元通过所述反馈电容上的电荷或电压变化来获得所述目标物体的预定信息。The capacitive sensing system according to claim 58, wherein the feedback branch comprises a feedback capacitor, the feedback capacitor is connected between the inverting end and the output end, and the sensing unit further comprises a calculation a unit, the computing unit being coupled to the output, the computing unit obtaining predetermined information of the target object by a change in charge or voltage on the feedback capacitor.
  61. 根据权利要求1所述的电容式感测***，其特征在于，所述传感器板包括多个电容感测极板，所述电容检测电路通过量测多个电容感测极板与所述目标物体之间的电容，来获得目标物体的预定信息。The capacitive sensing system according to claim 1, wherein the sensor board comprises a plurality of capacitive sensing plates, and the capacitance detecting circuit measures a plurality of capacitive sensing plates and the target object The capacitance between them to obtain the predetermined information of the target object.
  62. 一种电子设备，其特征在于：所述电子设备包括权利要求1-61中任意一项所述的电容式感测***。An electronic device, comprising: the capacitive sensing system of any one of claims 1-61.
  63. 根据权利要求62所述的电子设备，其特征在于：所述电子设备包括显示装置、控制按钮、壳体中任意一种、二种或全部，所述电容式感测***或者设置于所述显示装置的显示区域中，或者设置于所述控制按钮下，或者设置于所述壳体内。The electronic device according to claim 62, wherein the electronic device comprises any one, two or all of a display device, a control button, and a housing, and the capacitive sensing system is disposed on the display. The display area of the device is either disposed under the control button or disposed in the housing.
  64. 一种电容式感测***，包括：A capacitive sensing system comprising:
    传感器板，用于以电容耦合方式耦合到目标物体来执行感测操作；a sensor board for coupling to a target object in a capacitive coupling manner to perform a sensing operation;
    电容检测电路，所述电容检测电路包括信号传输端和调制端，所述电容检测电路用于通过所述信号传输端提供第一激励信号给传感器板， 以驱动传感器板执行感测操作，所述电容检测电路的调制端用于加载第一调制信号，所述第一激励信号随第一调制信号的变化而变化。a capacitance detecting circuit, the capacitance detecting circuit includes a signal transmitting end and a modulation end, and the capacitance detecting circuit is configured to provide a first excitation signal to the sensor board through the signal transmitting end, A sensing operation is performed to drive the sensor board, the modulation end of the capacitance detecting circuit is configured to load a first modulation signal, and the first excitation signal changes as the first modulation signal changes.
  65. 根据权利要求64所述的电容式感测***，其特征在于，所述电容检测电路中的电压均随所述调制端的电压的变化而变化。A capacitive sensing system according to claim 64, wherein the voltage in said capacitance detecting circuit varies with a change in voltage of said modulation terminal.
  66. 根据权利要求64所述的电容式感测***，其特征在于，所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述传感器板与所述调制端之间寄生电容的充放电电量。A capacitive sensing system according to claim 64, wherein said first excitation signal varies with said first modulation signal to reduce said sensor plate and said modulation terminal Charge and discharge of parasitic capacitance.
  67. 根据权利要求64所述的电容式感测***，其特征在于，第一调制信号与第一激励信号为电压信号，第一激励信号的电压随第一调制信号的电压的升高而升高、随第一调制信号的电压的降低而降低。The capacitive sensing system according to claim 64, wherein the first modulation signal and the first excitation signal are voltage signals, and the voltage of the first excitation signal increases as the voltage of the first modulation signal increases, Decreased as the voltage of the first modulated signal decreases.
  68. 根据权利要求67所述的电容式感测***，其特征在于，第一激励信号的幅度变化大小与第一调制信号的幅度变化大小对应相同。The capacitive sensing system according to claim 67, wherein the magnitude of the amplitude variation of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal.
  69. 根据权利要求64所述的电容式感测***，其特征在于，所述第一激励信号与所述第一调制信号为周期性变化的信号。A capacitive sensing system according to claim 64, wherein said first excitation signal and said first modulated signal are periodically varying signals.
  70. 根据权利要求69所述的电容式感测***，其特征在于，所述第一激励信号与所述第一调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第一激励信号的相位相对第一调制信号的相位具有一定的延迟。The capacitive sensing system according to claim 69, wherein the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or are co-channels of the same amplitude. The in-phase signal is either an intra-frequency signal and the phase of the first excitation signal has a certain delay relative to the phase of the first modulation signal.
  71. 根据权利要求67所述的电容式感测***，其特征在于，所述电容检测电路包括电源端、接地端，所述接地端用于加载第一电源信号，所述电源端用于加载第二电源信号，第二电源信号与第一电源信号之间的电压差为所述电容检测电路工作的电源电压。The capacitive sensing system according to claim 67, wherein the capacitance detecting circuit comprises a power terminal and a ground, wherein the ground is used to load a first power signal, and the power terminal is used to load a second The power signal, the voltage difference between the second power signal and the first power signal is a power supply voltage at which the capacitance detecting circuit operates.
  72. 根据权利要求71所述的电容式感测***，其特征在于，所述调制端为所述电源端与所述接地端二者中之一者，其中：The capacitive sensing system according to claim 71, wherein said modulation end is one of said power supply terminal and said ground terminal, wherein:
    当所述电源端为所述调制端时，所述第二电源信号包括所述第一调制信号，所述第一电源信号的电压随所述第二电源信号的电压的升高而升高、随所述第二电源信号的电压的降低而降低；或When the power terminal is the modulation terminal, the second power signal includes the first modulation signal, and a voltage of the first power signal increases as a voltage of the second power signal increases Decreasing as the voltage of the second power signal decreases; or
    当所述接地端为所述调制端时，所述第一电源信号包括所述第一调制信号，所述第二电源信号的电压随所述第一电源信号的电压升高而升 高、随所述第一电源信号的电压降低而降低。When the ground terminal is the modulation end, the first power signal includes the first modulation signal, and the voltage of the second power signal rises as the voltage of the first power signal increases High, decreasing as the voltage of the first power signal decreases.
  73. 根据权利要求71所述的电容式感测***，其特征在于，所述电容检测电路进一步包括参考电压端，所述参考电压端用于加载第三电源信号，所述第三电源信号的电压介于所述第二电源信号的电压与第一电源信号的电压之间，所述调制端为所述电源端、所述接地端、所述参考电压端三者中之一者，其中：The capacitive sensing system according to claim 71, wherein the capacitance detecting circuit further comprises a reference voltage terminal, wherein the reference voltage terminal is used to load a third power signal, and the voltage of the third power signal is Between the voltage of the second power signal and the voltage of the first power signal, the modulation end is one of the power terminal, the ground terminal, and the reference voltage terminal, wherein:
    当所述电源端为所述调制端时，所述第二电源信号包括所述第一调制信号，所述第一电源信号、第三电源信号的电压均随第二电源信号的电压的升高而升高、随第二电源信号的电压的降低而降低；或When the power terminal is the modulation terminal, the second power signal includes the first modulation signal, and voltages of the first power signal and the third power signal are both increased with voltage of the second power signal And rising, decreasing as the voltage of the second power signal decreases; or
    当所述接地端为所述调制端时，所述第一电源信号包括所述第一调制信号，所述第二电源信号、第三电源信号的电压均随第一电源信号的电压的升高而升高、随第一电源信号的电压的降低而降低；或When the ground terminal is the modulation end, the first power signal includes the first modulation signal, and the voltages of the second power signal and the third power signal are both increased with the voltage of the first power signal And rising, decreasing as the voltage of the first power signal decreases; or
    当所述参考电压端为所述调制端时，所述第三电源信号包括所述第一调制信号，所述第一电源信号、第二电源信号的电压均随第三电源信号的电压的升高而升高、随第三电源信号的电压的降低而降低。When the reference voltage terminal is the modulation terminal, the third power signal includes the first modulation signal, and the voltages of the first power signal and the second power signal are all increased with the voltage of the third power signal. It rises high and decreases as the voltage of the third power signal decreases.
  74. 根据权利要求64所述的电容式感测***，其特征在于：所述第一调制信号至少包括第一电平与第二电平，所述第一电平的电压不同于所述第二电平的电压。A capacitive sensing system according to claim 64, wherein said first modulated signal comprises at least a first level and a second level, said first level of voltage being different from said second Flat voltage.
  75. 根据权利要求64所述的电容式感测***，其特征在于：所述电容式感测***除用于在所述调制端加载第一调制信号时、提供第一激励信号驱动所述传感器板来执行第一检测模式外，还进一步用于在所述调制端加载第二调制信号时，提供第二激励信号驱动所述传感器板来执行第二检测模式，其中，第一调制信号不同于第二调制信号，第一激励信号不同于第二激励信号。The capacitive sensing system according to claim 64, wherein said capacitive sensing system is configured to provide a first excitation signal to drive said sensor board when said first modulation signal is applied to said modulation terminal And performing a first detection mode, further configured to: when the modulation end loads the second modulation signal, providing a second excitation signal to drive the sensor board to perform a second detection mode, where the first modulation signal is different from the second The modulated signal is different from the second excitation signal.
  76. 根据权利要求75所述的电容式感测***，其特征在于，所述第二激励信号随所述第二调制信号的变化而变化。A capacitive sensing system according to claim 75, wherein said second excitation signal varies as a function of said second modulated signal.
  77. 根据权利要求76所述的电容式感测***，其特征在于，所述第二激励信号随所述第二调制信号的变化而变化，用以减小所述传感器板与所述调制端之间寄生电容的充放电电量。 A capacitive sensing system according to claim 76, wherein said second excitation signal varies with said second modulation signal to reduce said sensor plate and said modulation terminal Charge and discharge of parasitic capacitance.
  78. 根据权利要求76所述的电容式感测***，其特征在于，所述第二调制信号与所述第二激励信号为电压信号，所述第二激励信号的电压随所述第二调制信号的电压的升高而升高、随所述第二调制信号的电压的降低而降低。The capacitive sensing system according to claim 76, wherein said second modulation signal and said second excitation signal are voltage signals, and said second excitation signal has a voltage corresponding to said second modulation signal The voltage rises and rises as the voltage of the second modulated signal decreases.
  79. 根据权利要求78所述的电容式感测***，其特征在于，第二激励信号的幅度变化大小与第二调制信号的幅度变化大小对应相同。The capacitive sensing system according to claim 78, wherein the magnitude of the amplitude variation of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
  80. 根据权利要求76所述的电容式感测***，其特征在于，所述第二激励信号与所述第二调制信号为周期性变化的信号。A capacitive sensing system according to claim 76, wherein said second excitation signal and said second modulation signal are periodically varying signals.
  81. 根据权利要求80所述的电容式感测***，其特征在于，所述第二激励信号与所述第二调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第二激励信号的相位相对第二调制信号的相位具有一定的延迟。The capacitive sensing system according to claim 80, wherein the second excitation signal and the second modulation signal are either co-frequency signals, or co-channel in-phase signals, or are co-frequency in-situ. The in-phase signal is either an intra-frequency signal and the phase of the second excitation signal has a certain delay relative to the phase of the second modulation signal.
  82. 根据权利要求76所述的电容式感测***，其特征在于，所述第一检测模式与所述第二检测模式中一种为指纹检测模式，另一种为触摸检测模式，其中，当所述电容式感测***处于触摸检测模式时，所述电容检测电路用于驱动所述传感器板执行触摸检测操作，感测是否有目标物体对所述传感器板进行触摸；当所述电容式感测***处于指纹检测模式时，所述电容检测电路用于驱动所述传感器板执行指纹检测操作，感测目标物体的指纹是否为预设指纹。The capacitive sensing system according to claim 76, wherein one of the first detection mode and the second detection mode is a fingerprint detection mode, and the other is a touch detection mode, wherein When the capacitive sensing system is in the touch detection mode, the capacitance detecting circuit is configured to drive the sensor board to perform a touch detecting operation, and sense whether a target object touches the sensor board; when the capacitive sensing When the system is in the fingerprint detection mode, the capacitance detecting circuit is configured to drive the sensor board to perform a fingerprint detecting operation, and sense whether the fingerprint of the target object is a preset fingerprint.
  83. 根据权利要求75所述的电容式感测***，其特征在于，所述第二调制信号包括第四电平与第五电平，所述第四电平的电压不同于所述第五电平的电压。A capacitive sensing system according to claim 75, wherein said second modulated signal comprises a fourth level and a fifth level, said fourth level having a voltage different from said fifth level Voltage.
  84. 根据权利要求75-83中任意一项所述的电容式感测***，其特征在于，第一调制信号与第二调制信号均为周期性变化的信号，其中，第一调制信号的频率大于第二调制信号的频率。The capacitive sensing system according to any one of claims 75 to 83, wherein the first modulated signal and the second modulated signal are both periodically varying signals, wherein the frequency of the first modulated signal is greater than The frequency of the two modulated signals.
  85. 根据权利要求75-83中任意一项所述的电容式感测***，其特征在于，第一调制信号的电压峰峰值大于第二调制信号的电压峰峰值。A capacitive sensing system according to any one of claims 75-83, wherein the voltage peak-to-peak value of the first modulated signal is greater than the voltage peak-to-peak value of the second modulated signal.
  86. 根据权利要求75-83中任意一项所述的电容式感测***，其特征在于，第一激励信号与第二激励信号均为周期性变化的信号，其中， 第一激励信号的频率大于第二调激励信号的频率。The capacitive sensing system according to any one of claims 75 to 83, wherein the first excitation signal and the second excitation signal are both periodically varying signals, wherein The frequency of the first excitation signal is greater than the frequency of the second excitation signal.
  87. 根据权利要求75-83中任意一项所述的电容式感测***，其特征在于，第一激励信号的电压峰峰值大于第二激励信号的电压峰峰值。A capacitive sensing system according to any one of claims 75-83, wherein the voltage peak-to-peak value of the first excitation signal is greater than the voltage peak-to-peak value of the second excitation signal.
  88. 根据权利要求75所述的电容式感测***，其特征在于，所述电容检测电路根据所述传感器板是否被触摸，来对应驱动所述传感器板是否执行指纹感测操作；The capacitive sensing system according to claim 75, wherein the capacitance detecting circuit correspondingly drives whether the sensor board performs a fingerprint sensing operation according to whether the sensor board is touched;
    若所述传感器板被触摸，所述电容检测电路则切换提供第二调制信号为第一调制信号给所述调制端、切换提供第二激励信号为第一激励信号给传感器板，用以执行指纹感测；If the sensor board is touched, the capacitance detecting circuit switches to provide a second modulated signal to the modulation end, and provides a second excitation signal as a first excitation signal to the sensor board for performing fingerprint processing. Sensing;
    若所述传感器板未被触摸，所述电容检测电路提供第二调制信号给所述调制端、提供第二激励信号给所述传感器板，用以执行触摸感测。If the sensor board is not touched, the capacitance detecting circuit provides a second modulation signal to the modulation end, and provides a second excitation signal to the sensor board for performing touch sensing.
  89. 根据权利要求72所述的电容式感测***，其特征在于，所述电容式感测***进一步包括控制电路，所述控制电路与所述电源端、接地端分别连接，用于为所述电源端提供所述第二电源信号，为所述接地端提供第一电源信号。The capacitive sensing system according to claim 72, wherein the capacitive sensing system further comprises a control circuit, wherein the control circuit is respectively connected to the power terminal and the ground terminal for The terminal provides the second power signal to provide a first power signal to the ground.
  90. 根据权利要求64所述的电容式感测***，其特征在于，所述电容检测电路用于对所述传感器板执行自电容检测。A capacitive sensing system according to claim 64, wherein said capacitance detecting circuit is operative to perform self-capacitance detection on said sensor board.
  91. 根据权利要求64所述的电容式感测***，其特征在于，所述电容式感测***为指纹感测***。The capacitive sensing system of claim 64, wherein the capacitive sensing system is a fingerprint sensing system.
  92. 根据权利要求91所述的电容式感测***，其特征在于，所述电容式感测***为节省驱动环的指纹感测***。The capacitive sensing system of claim 91, wherein the capacitive sensing system is a fingerprint sensing system that saves a drive loop.
  93. 根据权利要求64所述的电容式感测***，其特征在于，所述传感器板包括多个电容感测极板，所述电容检测电路通过量测所述多个电容感测极板与目标物体之间的电容大小来执行来感测操作，获得目标物体的预定信息。The capacitive sensing system according to claim 64, wherein said sensor board comprises a plurality of capacitive sensing plates, said capacitance detecting circuit measuring said plurality of capacitive sensing plates and target objects The capacitance between the sizes is performed to perform a sensing operation to obtain predetermined information of the target object.
  94. 根据权利要求93所述的电容式感测***，其特征在于，所述预定信息包括生物特征信息和/或触摸操作信息。A capacitive sensing system according to claim 93, wherein said predetermined information comprises biometric information and/or touch manipulation information.
  95. 根据权利要求94所述的电容式感测***，其特征在于，所述生物特征信息包括指纹、掌纹。 The capacitive sensing system of claim 94, wherein the biometric information comprises a fingerprint and a palm print.
  96. 根据权利要求94所述的电容式感测***，其特征在于，所述触摸操作信息为所述传感器板是否有被接近或触摸的操作信息。The capacitive sensing system according to claim 94, wherein the touch operation information is operation information of whether the sensor board is approached or touched.
  97. 根据权利要求93所述的电容式感测***，其特征在于，电容式感测***还包括屏蔽电极，屏蔽电极至少设置于传感器板的周围。The capacitive sensing system of claim 93, wherein the capacitive sensing system further comprises a shield electrode, the shield electrode being disposed at least around the sensor panel.
  98. 根据权利要求97所述的电容式感测***，其特征在于，所述屏蔽电极电连接至所述调制端，所述屏蔽电极接收所述第一调制信号。A capacitive sensing system according to claim 97, wherein said shield electrode is electrically coupled to said modulation terminal, said shield electrode receiving said first modulated signal.
  99. 根据权利要求97所述的电容式感测***，其特征在于，其特征在于，所述电容式感测***进一步包括散热板，所述散热板用于对所述电容式感测***进行散热，所述散热板还用于作为所述屏蔽电极。The capacitive sensing system according to claim 97, wherein the capacitive sensing system further comprises a heat dissipation plate for dissipating heat from the capacitive sensing system, The heat sink is also used as the shield electrode.
  100. 一种电子设备，其特征在于：所述电子设备包括权利要求64-99中任意一项所述的电容式感测***。An electronic device, comprising: the capacitive sensing system of any one of claims 64-99.
  101. 一种电容式感测***的检测方法，所述电容式感测***包括多个电容感测极板和电容检测电路，所述电容检测电路包括调制端，所述检测方法包括：A method for detecting a capacitive sensing system, the capacitive sensing system comprising a plurality of capacitive sensing plates and a capacitance detecting circuit, the capacitance detecting circuit comprising a modulation end, the detecting method comprising:
    提供第一激励信号给所述多个电容感测极板，驱动所述多个电容感测极板执行感测操作；Providing a first excitation signal to the plurality of capacitive sensing plates, and driving the plurality of capacitive sensing plates to perform a sensing operation;
    提供第一调制信号给所述调制端；Providing a first modulated signal to the modulation end;
    其中，所述第一激励信号随所述第一调制信号的变化而变化。Wherein the first excitation signal changes as the first modulation signal changes.
  102. 根据权利要求101所述的检测方法，其特征在于，所述第一激励信号随所述第一调制信号的变化而变化，用以减小所述多个电容感测极板与所述调制端之间寄生电容的充放电电量。The detecting method according to claim 101, wherein the first excitation signal changes with a change of the first modulation signal to reduce the plurality of capacitive sensing plates and the modulation end Charge and discharge power between parasitic capacitances.
  103. 根据权利要求101所述的检测方法，其特征在于，所述电容检测电路中的电压均随所述第一调制信号的电压的变化而变化。The detecting method according to claim 101, wherein a voltage in said capacitance detecting circuit changes in accordance with a change in a voltage of said first modulation signal.
  104. 根据权利要求101所述的检测方法，其特征在于，第一调制信号与第一激励信号为电压信号，第一激励信号的电压随第一调制信号的电压的升高而升高、随第一调制信号的电压的降低而降低。The detecting method according to claim 101, wherein the first modulation signal and the first excitation signal are voltage signals, and the voltage of the first excitation signal increases as the voltage of the first modulation signal increases, with the first The voltage of the modulated signal is lowered and lowered.
  105. 根据权利要求104所述的检测方法，其特征在于，第一激励信号的幅度变化大小与第一调制信号的幅度变化大小对应相同。The detecting method according to claim 104, wherein the magnitude of the amplitude change of the first excitation signal is the same as the magnitude of the amplitude variation of the first modulation signal.
  106. 根据权利要求101所述的检测方法，其特征在于，所述第一激 励信号与所述第一调制信号为周期性变化的信号。The detecting method according to claim 101, wherein said first excitation The excitation signal and the first modulation signal are periodically varying signals.
  107. 根据权利要求106所述的检测方法，其特征在于，所述第一激励信号与所述第一调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第一激励信号的相位相对第一调制信号的相位具有一定的延迟。The detecting method according to claim 106, wherein the first excitation signal and the first modulation signal are either co-frequency signals, or co-channel in-phase signals, or same-same frequency in-phase signals Or a co-frequency signal, and the phase of the first excitation signal has a certain delay with respect to the phase of the first modulation signal.
  108. 根据权利要求101所述的检测方法，其特征在于，所述检测方法进一步包括：The detecting method according to claim 101, wherein the detecting method further comprises:
    提供第二激励信号给所述多个电容感测极板执行感测操作；Providing a second excitation signal to perform sensing operations on the plurality of capacitive sensing plates;
    提供第二调制信号给所述调制端；Providing a second modulated signal to the modulation end;
    其中，所述第二激励信号随所述第二调制信号的变化而变化。Wherein the second excitation signal changes as the second modulation signal changes.
  109. 根据权利要求108所述的检测方法，其特征在于，第二激励信号不同于第一激励信号，第二调制信号不同于第一调制信号。The detecting method according to claim 108, wherein the second excitation signal is different from the first excitation signal, and the second modulation signal is different from the first modulation signal.
  110. 根据权利要求109所述的检测方法，其特征在于，所述第二激励信号随所述第二调制信号的变化而变化，用以减小所述多个电容感测极板与所述调制端之间寄生电容的充放电电量。The detecting method according to claim 109, wherein the second excitation signal changes with a change of the second modulation signal to reduce the plurality of capacitive sensing plates and the modulation end Charge and discharge power between parasitic capacitances.
  111. 根据权利要求110所述的检测方法，其特征在于，第二调制信号与第二激励信号为电压信号，第二激励信号的电压随第二调制信号的电压的升高而升高、随第二调制信号的电压的降低而降低。The detecting method according to claim 110, wherein the second modulation signal and the second excitation signal are voltage signals, and the voltage of the second excitation signal increases as the voltage of the second modulation signal increases, followed by the second The voltage of the modulated signal is lowered and lowered.
  112. 根据权利要求111所述的检测方法，其特征在于，所述第二激励信号的幅度变化大小与第二调制信号的幅度变化大小对应相同。The detecting method according to claim 111, wherein the magnitude of the amplitude change of the second excitation signal is the same as the magnitude of the amplitude variation of the second modulation signal.
  113. 根据权利要求109所述的检测方法，其特征在于，所述第二激励信号与所述第二调制信号为周期性变化的信号。The detecting method according to claim 109, wherein said second excitation signal and said second modulation signal are periodically varying signals.
  114. 根据权利要求113所述的检测方法，其特征在于，所述第二激励信号与所述第二调制信号或为同频信号，或为同频同相信号，或为同幅同频同相信号，或为同频信号、且所述第二激励信号的相位相对第二调制信号的相位具有一定的延迟。The detecting method according to claim 113, wherein the second excitation signal and the second modulation signal are either co-frequency signals, or co-channel in-phase signals, or co-channel in-phase signals Or a co-frequency signal, and the phase of the second excitation signal has a certain delay with respect to the phase of the second modulation signal.
  115. 根据权利要求109所述的检测方法，其特征在于，第一调制信号与第二调制信号均为周期性变化的信号，其中，第一调制信号的频率大于第二调制信号的频率。 The detecting method according to claim 109, wherein the first modulated signal and the second modulated signal are both periodically varying signals, wherein the frequency of the first modulated signal is greater than the frequency of the second modulated signal.
  116. 根据权利要求109所述的检测方法，其特征在于，第一调制信号的电压峰峰值大于第二调制信号的电压峰峰值。The detecting method according to claim 109, wherein the voltage peak-to-peak value of the first modulation signal is greater than the voltage peak-to-peak value of the second modulation signal.
  117. 根据权利要求116或117所述的检测方法，其特征在于，提供第一激励信号给所述多个电容感测极板，用于驱动所述多个电容感测极板执行指纹感测操作；提供第二激励信号给所述多个电容感测极板，用于驱动所述多个电容感测极板执行触摸操作。The detecting method according to claim 116 or 117, wherein a first excitation signal is provided to the plurality of capacitive sensing plates for driving the plurality of capacitive sensing plates to perform a fingerprint sensing operation; Providing a second excitation signal to the plurality of capacitive sensing plates for driving the plurality of capacitive sensing plates to perform a touch operation.
  118. 根据权利要求117所述的检测方法，其特征在于，所述检测方法进一步包括：The detecting method according to claim 117, wherein the detecting method further comprises:
    判断所述多个电容感测极板是否被触摸，并根据判断结果来对应驱动所述多个电容感测极板是否执行指纹感测操作；Determining whether the plurality of capacitive sensing plates are touched, and correspondingly driving whether the plurality of capacitive sensing plates perform a fingerprint sensing operation according to the determination result;
    若判断所述多个电容感测极板被触摸，则切换提供第二调制信号为第一调制信号给所述接地端、切换提供第二激励信号为第一激励信号给所述多个电容感测极板，来执行指纹感测；If it is determined that the plurality of capacitive sensing plates are touched, switching provides a second modulated signal to the ground, and providing a second excitation signal to the first excitation signal to the plurality of capacitive senses Measuring plate to perform fingerprint sensing;
    若判断所述多个电容感测极板未被触摸，则提供第二调制信号给接地端、提供第二激励信号给所述多个电容感测极板，来执行触摸感测。If it is determined that the plurality of capacitive sensing plates are not touched, providing a second modulation signal to the ground and providing a second excitation signal to the plurality of capacitive sensing plates to perform touch sensing.
  119. 根据权利要求101所述的检测方法，其特征在于，所述电容式感测***进一步包括屏蔽电极，所述屏蔽电极至少设置在所述多个电容感测极板的***，所述检测方法进一步包括：The detecting method according to claim 101, wherein the capacitive sensing system further comprises a shielding electrode, the shielding electrode is disposed at least on a periphery of the plurality of capacitive sensing plates, and the detecting method is further include:
    提供所述第一调制信号给所述屏蔽电极。Providing the first modulated signal to the shield electrode.
  120. 根据权利要求101所述的检测方法，其特征在于，所述检测方法通过量测所述多个电容感测极板与目标物体之间的电容，来感测目标物体的预定信息。The detecting method according to claim 101, wherein the detecting method senses predetermined information of the target object by measuring a capacitance between the plurality of capacitive sensing plates and the target object.
  121. 根据权利要求120所述的检测方法，其特征在于，所述预定信息包括目标物体的生物特征信息和/或触摸操作信息。The detecting method according to claim 120, wherein the predetermined information includes biometric information and/or touch operation information of the target object.
  122. 根据权利要求121所述的检测方法，其特征在于，所述生物特征信息为指纹信息。The detecting method according to claim 121, wherein the biometric information is fingerprint information.
  123. 根据权利要求121所述的检测方法，其特征在于，所述触摸操作信息为是否有目标物体接近或触摸所述多个电容感测极板。The detecting method according to claim 121, wherein the touch operation information is whether a target object approaches or touches the plurality of capacitive sensing plates.
  124. 根据权利要求120所述的检测方法，其特征在于，所述检测方 法通过量测所述多个电容感测极板与目标物体之间的自电容，来感测目标物体的预定信息。The detecting method according to claim 120, wherein said detecting party The method senses predetermined information of the target object by measuring self-capacitance between the plurality of capacitive sensing plates and the target object.
  125. 根据权利要求101所述的检测方法，其特征在于，所述电容检测电路包括接地端与电源端，所述检测方法进一步包括：The detecting method according to claim 101, wherein the capacitance detecting circuit comprises a ground end and a power end, and the detecting method further comprises:
    提供第一电源信号给所述接地端；Providing a first power signal to the ground terminal;
    提供第二电源信号给所述电源端，所述第二电源信号与所述第一电源信号的电压差为所述电容检测电路工作的电源电压。And providing a second power signal to the power terminal, wherein a voltage difference between the second power signal and the first power signal is a power voltage of the capacitor detecting circuit.
  126. 根据权利要求125所述的检测方法，其特征在于，所述调制端为所述电源端与所述接地端二者中之一者，其中：The detecting method according to claim 125, wherein the modulation end is one of the power terminal and the ground terminal, wherein:
    当所述电源端为所述调制端时，所述第二电源信号包括所述第一调制信号，所述第一电源信号的电压随所述第二电源信号的电压的升高而升高、随所述第二电源信号的电压的降低而降低；或When the power terminal is the modulation terminal, the second power signal includes the first modulation signal, and a voltage of the first power signal increases as a voltage of the second power signal increases Decreasing as the voltage of the second power signal decreases; or
    当所述接地端为所述调制端时，所述第一电源信号包括所述第一调制信号，所述第二电源信号的电压随所述第一电源信号的电压升高而升高、随所述第一电源信号的电压降低而降低。When the ground terminal is the modulation end, the first power signal includes the first modulation signal, and the voltage of the second power signal increases as the voltage of the first power signal increases, The voltage of the first power signal decreases and decreases.
  127. 根据权利要求125所述的检测方法，其特征在于，所述电容检测电路进一步包括参考电压端，所述检测方法进一步包括：The detecting method according to claim 125, wherein the capacitance detecting circuit further comprises a reference voltage terminal, the detecting method further comprising:
    提供第三电源信号给所述参考电压端，所述第三电源信号的电压介于所述第二电源信号的电压与第一电源信号的电压之间；Providing a third power signal to the reference voltage terminal, wherein a voltage of the third power signal is between a voltage of the second power signal and a voltage of the first power signal;
    其中，调制端为电源端、接地端、参考电压端三者中之一者：The modulation end is one of a power terminal, a ground terminal, and a reference voltage terminal:
    当所述电源端为所述调制端时，所述第二电源信号包括所述第一调制信号，所述第一电源信号、第三电源信号的电压均随第二电源信号的电压的升高而升高、随第二电源信号的电压的降低而降低；或When the power terminal is the modulation terminal, the second power signal includes the first modulation signal, and voltages of the first power signal and the third power signal are both increased with voltage of the second power signal And rising, decreasing as the voltage of the second power signal decreases; or
    当所述接地端为所述调制端时，所述第一电源信号包括所述第一调制信号，所述第二电源信号、第三电源信号的电压均随第一电源信号的电压的升高而升高、随第一电源信号的电压的降低而降低；或When the ground terminal is the modulation end, the first power signal includes the first modulation signal, and the voltages of the second power signal and the third power signal are both increased with the voltage of the first power signal And rising, decreasing as the voltage of the first power signal decreases; or
    当所述参考电压端为所述调制端时，所述第三电源信号包括所述第一调制信号，所述第一电源信号、第二电源信号的电压均随第三电源信号的电压的升高而升高、随第三电源信号的电压的降低而降低。 When the reference voltage terminal is the modulation terminal, the third power signal includes the first modulation signal, and the voltages of the first power signal and the second power signal are all increased with the voltage of the third power signal. It rises high and decreases as the voltage of the third power signal decreases.
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