CN104516716A - Electronic equipment, capacitive sensing system and detection method of capacitive sensing system - Google Patents

Electronic equipment, capacitive sensing system and detection method of capacitive sensing system Download PDF

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Publication number
CN104516716A
CN104516716A CN201510015704.0A CN201510015704A CN104516716A CN 104516716 A CN104516716 A CN 104516716A CN 201510015704 A CN201510015704 A CN 201510015704A CN 104516716 A CN104516716 A CN 104516716A
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China
Prior art keywords
signal
voltage
modulation signal
capacitive
capacitive sensing
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CN201510015704.0A
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Chinese (zh)
Inventor
刘学春
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FocalTech Systems Ltd
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SHENZHEN YAGENG ELECTRONIC TECHNOLOGY Co Ltd
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Application filed by SHENZHEN YAGENG ELECTRONIC TECHNOLOGY Co Ltd filed Critical SHENZHEN YAGENG ELECTRONIC TECHNOLOGY Co Ltd
Priority to CN201510015704.0A priority Critical patent/CN104516716A/en
Publication of CN104516716A publication Critical patent/CN104516716A/en
Priority to PCT/CN2015/099560 priority patent/WO2016112781A1/en
Priority to CN201580002461.5A priority patent/CN105793869A/en
Priority to PCT/CN2016/070738 priority patent/WO2016112848A1/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

Abstract

The invention discloses a capacitive sensing system, electronic equipment and a detection method of the capacitive sensing system. The capacitive sensing system comprises a sensor board and a capacitance detection circuit, wherein the sensor board is coupled with a target object in a capacitance manner to execute sensing operation; the capacitance detection circuit comprises a signal transmission end and an earthing end, and is used for providing a first excitation signal for the sensor board via the signal transmission end to drive the sensor board to execute sensing operation; the earthing end of the capacitance detection circuit is used for loading a first modulation signal; and the first excitation signal varies with the first modulation signal. With the adoption of the technical scheme, the sensing accuracy of the electronic equipment is improved.

Description

The detection method of electronic equipment and capacitive sensing system and capacitive sensing system
Technical field
The present invention relates to a kind of capacitive sensing system, there is the detection method of the electronic equipment of described capacitive sensing system and a kind of capacitive sensing system, particularly relate to a kind of fingerprint sensing system, there is the detection method of the electronic equipment of described fingerprint sensing system and a kind of fingerprint sensing system.
Background technology
At present, increasing electronic equipment (as: mobile phone, panel computer etc.) all can be provided with one or more sensing systems, as operate for sensing touch touch-sensing system, for sensing the biological characteristic sensing system etc. of human body biological characteristics, described biological characteristic comprises fingerprint, palmmprint etc., and touch-sensing system and biological characteristic sensing system perform sense operation mainly with capacitive sensing system.
Described capacitive sensing system generally includes sensor board and capacitive detection circuit, and described sensor board is used for being coupled to target object with capacitive coupling, and described target object is as the finger for user.Described capacitive detection circuit provides drive singal for described sensor board, and receives the sensing signal exported from sensor board, and then realizes the predetermined information of sensed object object.Described predetermined information is as being biological information, touch information etc.
Described capacitive detection circuit generally includes power end, earth terminal and Signal transmissions end.Described power end and earth terminal for receiving supply voltage, to ensure that described capacitive detection circuit normally works.Described Signal transmissions end is the 3rd end being different from described power end and earth terminal, described Signal transmissions end for transmitting the signal between described capacitive detection circuit and described sensor board, as described in drive singal, sensing signal.
So, stray capacitance is there is between described sensor board and described earth terminal, this stray capacitance be and electric capacity between target object and sensor board superimposed, if the electric capacity between target object and sensor board is too small, then the quality of described sensing signal is too poor and cannot detect, thus impact sensing precision.
Summary of the invention
For solving the problems of the technologies described above, the invention provides and a kind ofly sense the higher capacitive sensing system of precision, there is the electronic equipment of described capacitive sensing system and a kind of detection method of capacitive sensing system.
For achieving the above object, the invention provides following technical scheme:
A kind of capacitive sensing system, comprising:
Sensor board, for being coupled to target object in a capacitive manner to perform sense operation;
Capacitive detection circuit, described capacitive detection circuit comprises Signal transmissions end and earth terminal, described capacitive detection circuit is used for providing the first pumping signal to described sensor board by described Signal transmissions end, sense operation is performed to drive described sensor board, the earth terminal of described capacitive detection circuit is for loading the first modulation signal, and described first pumping signal changes with the change of described first modulation signal.
Preferably, described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described first modulation signal.
Preferably, described first modulation signal and described first pumping signal are voltage signal, and the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
Preferably, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.
Preferably, described first pumping signal and described first modulation signal are periodically variable signal.
Preferably, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal.
Preferably, described earth terminal is for loading the first power supply signal, described first power supply signal comprises described first modulation signal, described capacitive detection circuit comprises power end further, described power end is for loading second source signal, the voltage of second source signal is higher than the voltage of the first power supply signal, and described second source signal changes with the change of described first modulation signal, or described second source signal changes with the change of described first power supply signal.
Preferably, described second source signal and described first modulation signal are homogenous frequency signal, or described second source signal and described first power supply signal are homogenous frequency signal.
Preferably, described first power supply signal, described second source signal are voltage signal, the voltage of institute's second source signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal, or the voltage of institute's second source signal raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal.
Preferably, the voltage difference between described second source signal and described first power supply signal is the supply voltage of described capacitive detection circuit work.
Preferably, other voltage in described capacitive detection circuit all raises with the rising of the voltage of described first power supply signal, reduce with the reduction of the voltage of described first power supply signal.
Preferably, described first modulation signal at least comprises the first level and second electrical level, and the voltage of described first level is different from the voltage of described second electrical level.
Preferably, described first modulation signal comprises the square-wave signal that the first level and second electrical level alternately occur, wherein, the voltage condition of described first level and second electrical level is any one in following three kinds of situations:
The voltage of the first: the first level is positive voltage, and the voltage of second electrical level is 0;
The voltage of the second: the first level is 0, and the voltage of second electrical level is negative voltage;
The voltage of the three: the first level is positive voltage, and the voltage of second electrical level is negative voltage, and the absolute value of the voltage of described first level is the same or different than the absolute value of the voltage of described second electrical level.
Preferably, described capacitive detection circuit is when the level of described earth terminal is the first level, the first signal is read from described sensor board, and when the level of described earth terminal is second electrical level, read secondary signal from described sensor board, obtained the predetermined information of target object by the first signal of described reading and secondary signal.
Preferably, described first modulation signal comprises three level further, the voltage of described second electrical level is between the voltage and the voltage of three level of the first level, and described first modulation signal comprises the secondary ladder square-wave signal be made up of the first level, second electrical level, three level three.
Preferably, described capacitive detection circuit is when the level of described earth terminal is the first level, the first signal is read from described sensor board, when the level of described earth terminal is second electrical level, secondary signal is read from described sensor board, when the level of described earth terminal is three level, the 3rd signal is read from described sensor board, and when the level of described earth terminal switches to second electrical level from three level, the 4th signal is read from described sensor board, by the first signal of described reading, secondary signal, the predetermined information of the 3rd signal and the 4th signal acquisition target object.
Preferably, described capacitive sensing system comprises control circuit further, and the earth terminal of described capacitive detection circuit is electrically connected with described control circuit, and described control circuit is for applying the earth terminal of described first modulation signal to described capacitive detection circuit.
Preferably, the power end of described capacitive detection circuit is electrically connected with described control circuit, and described control circuit, for applying described first power supply signal to described earth terminal, applies second source signal to described power end.
Preferably, described control circuit comprises earth terminal, the voltage of the earth terminal of described control circuit be 0 volt or for the electronic equipment at described capacitive sensing system place systematically voltage or be the systematically voltage of an electronic equipment or be constant voltage.
Preferably, described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged at around described sensor board.
Preferably, described guarded electrode is any one following situation:
The first, described guarded electrode comprises multiple electrode, is distributed in around described sensor board;
The second, described guarded electrode is the electrode of middle hollow out, and the void region of the corresponding described guarded electrode of described sensor board is arranged;
3rd, described guarded electrode and the stacked setting of described sensor board, and along the direction of stacked vertical, the periphery of described guarded electrode exceeds the periphery of described sensor board.
Preferably, described capacitive sensing system comprises heat sink further, and described heat sink is used for dispelling the heat to described capacitive sensing system, and described heat sink is also for as described guarded electrode.
Preferably, described sensor board and the stacked setting of described heat sink, along the direction of stacked vertical, the periphery of described heat sink exceeds the edge of described sensor board.
Preferably, described capacitive sensing system comprises multiple lead frame further, and described guarded electrode and described multiple lead frame are positioned at same layer, are manufactured from the same material.
Preferably, described capacitive detection circuit and described sensor board are integrated in a capacitive detection circuit chip, described capacitive sensing system comprises substrate further, and described capacitive detection circuit chip is arranged on the substrate, and described guarded electrode is arranged on the substrate.
Preferably, described substrate is printed circuit board (PCB) or flexible circuit board.
Preferably, described guarded electrode is made up of metal or other conductive material.
Preferably, described guarded electrode is electrically connected to the earth terminal of described capacitive detection circuit, for receiving described first modulation signal.
Preferably, described sensor board comprises multiple capacitance sensing pole plate, and described capacitive detection circuit, by measuring the electric capacity between multiple capacitance sensing pole plate and described target object, obtains the predetermined information of described target object.
Preferably, described multiple capacitance sensing pole plate is arranged in induction arrays, and described guarded electrode is at least arranged on around described induction arrays.
Preferably, described capacitive detection circuit except for when described earth terminal loads described first modulation signal, described first pumping signal be provided drive described sensor board to perform the first detecting pattern except, also be further used for when described earth terminal loads the second modulation signal, provide the second pumping signal to drive described sensor board to perform the second detecting pattern, wherein, first modulation signal is different from the second modulation signal, and the first pumping signal is different from the second pumping signal.
Preferably, described second pumping signal changes with the change of described second modulation signal.
Preferably, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described second modulation signal.
Preferably, described second modulation signal and described second pumping signal are voltage signal, and the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal.
Preferably, the changes in amplitude size of described second pumping signal is corresponding identical with the changes in amplitude size of described second modulation signal.
Preferably, described second pumping signal and described second modulation signal are periodically variable signal.
Preferably, described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal.38, capacitive sensing system according to claim 31, is characterized in that, described second modulation signal at least comprises the 4th level and the 5th level, and wherein, the voltage of the 4th level is different from the voltage of the 5th level.
Preferably, first detecting pattern is fingerprint sensing pattern, second detecting pattern is for touching detecting pattern, wherein, when described capacitive sensing system is in touch detecting pattern, described capacitive detection circuit touches detection operation for driving described sensor board to perform, and sensed object object is to the touch of described sensor board; When described capacitive sensing system is in fingerprint detection pattern, described capacitive detection circuit performs fingerprint detection operation, the fingerprint of sensed object object for driving described sensor board.
Preferably, the first modulation signal and the second modulation signal are periodically variable signal, and wherein, the frequency of the first modulation signal is greater than the frequency of the second modulation signal.
Preferably, the Voltage Peak peak value of the first modulation signal is greater than the Voltage Peak peak value of the second modulation signal.
Preferably, the first pumping signal and the second pumping signal are periodically variable signal, and wherein, the frequency of the first pumping signal is greater than the frequency of the second pumping signal.
Preferably, the Voltage Peak peak value of the first pumping signal is greater than the Voltage Peak peak value of the second pumping signal.
Preferably, whether described capacitive detection circuit is touched according to described sensor board, carrys out the described sensor board of corresponding driving and whether performs fingerprint sensing operation;
If described sensor board is touched, described capacitive detection circuit then switch provide the second modulation signal for the first modulation signal to described earth terminal, switch provide the second pumping signal be the first pumping signal to sensor board, in order to perform fingerprint sensing;
If described sensor board is not touched, described capacitive detection circuit provides the second modulation signal to described earth terminal, provides the second pumping signal to described sensor board, in order to perform touch-sensing.
More preferably, whether described capacitive detection circuit senses described sensor board by the electric capacity measured between described sensor board and described target object and is touched.
Preferably, described capacitive detection circuit is integrated in a capacitive detection circuit chip, described control circuit is integrated in a control circuit chip, described capacitive detection circuit chip and described control circuit chip or be encapsulated in an integrated antenna package, or be encapsulated in respectively in two integrated antenna packages.
Preferably, described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged at around described sensor board, wherein:
The integrated antenna package including described capacitive detection circuit chip comprises the lead frame be connected with described capacitive detection circuit chip, and described guarded electrode and described lead frame are positioned at same layer, and are manufactured from the same material; Or/and
The integrated antenna package including described capacitive detection circuit chip comprises heat sink, and described heat sink is used for dispelling the heat to described capacitive detection circuit chip, also for as described guarded electrode; Or/and
The integrated antenna package including described capacitive detection circuit chip comprises substrate, and described capacitive detection circuit chip is arranged on the substrate, and described substrate arranges described guarded electrode further.
Preferably, described capacitive detection circuit drives described sensor board to perform sense operation, and to obtain the predetermined information of described target object, wherein, described predetermined information comprises biological information and/or the touch operation information of target object.
Preferably, described biological information is finger print information.
Preferably, described touch operation information for whether have target object close to or touch described sensor board.
Preferably, described capacitive sensing system is fingerprint sensing system.
Preferably, described capacitive sensing system is the capacitive sensing system saving driving ring.
Preferably, described capacitive detection circuit carries out self-capacitance detection to described sensor board, to realize sense operation by providing described first pumping signal.
Preferably, described capacitive sensing system is used for the predetermined information that sensed object object is finger.
Preferably, described sensor board comprises multiple capacitance sensing pole plate, described capacitive detection circuit comprises multiple sensing cell and multiple selection unit, each sensing cell is connected with at least one capacitance sensing pole plate by a selection unit, each sensing cell is electrically connected with described earth terminal further, each sensing cell provides the first pumping signal to described capacitance sensing pole plate by described selection unit, and the sensing signal received from described capacitance sensing pole plate, the predetermined information of target object is obtained by described sensing signal.
Preferably, described selection unit conducts for selecting sensing cell and which capacitance sensing pole plate, wherein, by described multiple selection unit, described capacitive detection circuit simultaneously or timesharing export described first pumping signal to described multiple capacitance sensing pole plate.
Preferably, described sensing cell comprises operational amplifier and feedback branch, described operational amplifier comprises in-phase end, end of oppisite phase and output terminal, described end of oppisite phase connects at least one capacitance sensing pole plate by a selection unit, described feedback branch is connected between end of oppisite phase and output terminal, and described operational amplifier connects described earth terminal.
Preferably, the in-phase end of described operational amplifier receives a reference voltage, and described reference voltage raises with the voltage rising of described first modulation signal, declines with the voltage drop of described first modulation signal.
Preferably, described end of oppisite phase exports described first pumping signal to described capacitance sensing pole plate.
Preferably, empty short status is in during described operational amplifier work.
Preferably, described feedback branch comprises a feedback capacity, described feedback capacity is connected between end of oppisite phase and output terminal, described sensing cell comprises computing unit further, described computing unit is connected with described output terminal, and described computing unit obtains the predetermined information of described target object by the electric charge in described feedback capacity or change in voltage.
Preferably, described sensor board comprises multiple capacitance sensing pole plate, and described capacitive detection circuit, by measuring the electric capacity between multiple capacitance sensing pole plate and described target object, obtains the predetermined information of described target object.
The present invention further provides a kind of electronic equipment, wherein, described electronic equipment comprises capacitive sensing system as above.
Preferably, described electronic equipment to comprise further in display device, control knob, housing any one, two kinds or all, described capacitive sensing system or be arranged in the viewing area of described display device, or under being arranged at described control knob, or be arranged in described housing.
The present invention provides again a kind of capacitive sensing system, comprising:
Sensor board, for being coupled to target object to perform sense operation with capacitive coupling;
Capacitive detection circuit, described capacitive detection circuit comprises Signal transmissions end and modulated terminal, described capacitive detection circuit is used for providing the first pumping signal to described sensor board by described Signal transmissions end, sense operation is performed to drive described sensor board, the modulated terminal of described capacitive detection circuit is for loading the first modulation signal, and described first pumping signal changes with the change of described first modulation signal.
Preferably, other voltage in described capacitive detection circuit all changes with the change of the voltage of described modulated terminal.
Preferably, described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described first modulation signal.
Preferably, described first modulation signal and described first pumping signal are voltage signal, and the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
Preferably, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.
Preferably, described first pumping signal and described first modulation signal are periodically variable signal.
Preferably, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal.
Preferably, described capacitive detection circuit comprises power end, earth terminal, described earth terminal is for loading the first power supply signal, and described power end is for loading second source signal, and the voltage difference between second source signal and the first power supply signal is the supply voltage of described capacitive detection circuit work.
Preferably, described modulated terminal is the one in described power end and described both earth terminals, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal raises with the voltage rising of described first power supply signal, reduces with the voltage reduction of described first power supply signal.
Preferably, described capacitive detection circuit comprises reference voltage end further, described reference voltage end is for loading the 3rd power supply signal, the voltage of described 3rd power supply signal is between the voltage and the voltage of the first power supply signal of described second source signal, described modulated terminal is the one in described power end, described earth terminal, described reference voltage end three, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal, the 3rd power supply signal all raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal, the 3rd power supply signal all raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal; Or
When described reference voltage end is described modulated terminal, described 3rd power supply signal comprises described first modulation signal, and the voltage of described first power supply signal, second source signal all raises with the rising of the voltage of described 3rd power supply signal, reduces with the reduction of the voltage of described 3rd power supply signal.
Preferably, described first modulation signal at least comprises the first level and second electrical level, and the voltage of described first level is different from the voltage of described second electrical level.
Preferably, described capacitive sensing system except for when described modulated terminal loads the first modulation signal, the first pumping signal be provided drive described sensor board to perform the first detecting pattern except, also be further used for when described modulated terminal loads the second modulation signal, the second pumping signal is provided to drive described sensor board to perform the second detecting pattern, wherein, first modulation signal is different from the second modulation signal, and the first pumping signal is different from the second pumping signal.
Preferably, described second pumping signal changes with the change of described second modulation signal.
Preferably, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described second modulation signal.
Preferably, described second modulation signal and described second pumping signal are voltage signal, and the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal.
Preferably, the changes in amplitude size of described second pumping signal is corresponding identical with the changes in amplitude size of described second modulation signal.
Preferably, described second pumping signal and described second modulation signal are periodically variable signal.
Preferably, described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal.
Preferably, in described first detecting pattern and described second detecting pattern, one is fingerprint detection pattern, another kind of for touching detecting pattern, wherein, when described capacitive sensing system is in touch detecting pattern, described capacitive detection circuit touches detection operation for driving described sensor board to perform, and whether sensing has target object to touch described sensor board; When described capacitive sensing system is in fingerprint detection pattern, described capacitive detection circuit performs fingerprint detection operation for driving described sensor board, and whether the fingerprint of sensed object object is preset fingerprint.
Preferably, described second modulation signal comprises the 4th level and the 5th level, and the voltage of described 4th level is different from the voltage of described 5th level.
Preferably, the first modulation signal and the second modulation signal are periodically variable signal, and wherein, the frequency of the first modulation signal is greater than the frequency of the second modulation signal.
Preferably, the Voltage Peak peak value of the first modulation signal is greater than the Voltage Peak peak value of the second modulation signal.
Preferably, the first pumping signal and the second pumping signal are periodically variable signal, and wherein, the frequency of the first pumping signal is greater than the frequency of the second tune pumping signal.
Preferably, the Voltage Peak peak value of the first pumping signal is greater than the Voltage Peak peak value of the second pumping signal.
Preferably, whether described capacitive detection circuit is touched according to described sensor board, carrys out the described sensor board of corresponding driving and whether performs fingerprint sensing operation;
If described sensor board is touched, described capacitive detection circuit then switch provide the second modulation signal for the first modulation signal to described earth terminal, switch provide the second pumping signal be the first pumping signal to sensor board, in order to perform fingerprint sensing;
If described sensor board is not touched, described capacitive detection circuit provides the second modulation signal to described earth terminal, provides the second pumping signal to described sensor board, in order to perform touch-sensing.
More preferably, whether described capacitive detection circuit senses described sensor board by the electric capacity measured between described sensor board and described target object and is touched.
Preferably, described capacitive sensing system comprises control circuit further, and described control circuit is connected respectively with described power end, earth terminal, for providing described second source signal for described power end, for described earth terminal provides the first power supply signal.
Preferably, described capacitive detection circuit is used for performing self-capacitance detection to described sensor board.
Preferably, described capacitive sensing system is fingerprint sensing system.
Preferably, described capacitive sensing system is the fingerprint sensing system saving driving ring.
Preferably, described sensor board comprises multiple capacitance sensing pole plate, and described capacitive detection circuit performs sense operation by the capacitance size measured between described multiple capacitance sensing pole plate and target object, obtains the predetermined information of target object.
Preferably, described predetermined information comprises biological information and/or touch operation information.
Preferably, described biological information comprises fingerprint, palmmprint.
Preferably, described touch operation information is whether described sensor board has by operation information that is close or that touch.
Preferably, described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged at around described sensor board.
Preferably, described guarded electrode is electrically connected to described modulated terminal, and described guarded electrode receives described first modulation signal.
Preferably, described capacitive sensing system comprises heat sink further, and described heat sink is used for dispelling the heat to described capacitive sensing system, and described heat sink is also for as described guarded electrode.
The present invention provides again a kind of electronic equipment, and wherein, described electronic equipment comprises capacitive sensing system as above.
The present invention also provides a kind of detection method of capacitive sensing system, and described capacitive sensing system comprises multiple capacitance sensing pole plate and capacitive detection circuit, and described capacitive detection circuit comprises modulated terminal, and described detection method comprises:
There is provided the first pumping signal to described multiple capacitance sensing pole plate, drive described multiple capacitance sensing pole plate to perform sense operation;
There is provided the first modulation signal to described modulated terminal;
Wherein, described first pumping signal changes with the change of described first modulation signal.
Preferably, described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described multiple capacitance sensing pole plate and described modulated terminal with the change of described first modulation signal.
Preferably, other voltage in described capacitive detection circuit all raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of the first modulation signal.
Preferably, described first modulation signal and described first pumping signal are voltage signal, and the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
Preferably, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.
Preferably, described first pumping signal and described first modulation signal are periodically variable signal.
Preferably, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal.
Preferably, described detection method comprises further:
The second pumping signal is provided to perform sense operation to described multiple capacitance sensing pole plate;
There is provided the second modulation signal to described modulated terminal;
Wherein, described second pumping signal changes with the change of described second modulation signal.
Preferably, described second pumping signal is different from described first pumping signal, and described second modulation signal is different from described first modulation signal.
Preferably, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described multiple capacitance sensing pole plate and described modulated terminal with the change of described second modulation signal.
Preferably, described second modulation signal and described second pumping signal are voltage signal, and the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal.
Preferably, the changes in amplitude size of described second pumping signal is corresponding identical with the changes in amplitude size of described second modulation signal.
Preferably, described second pumping signal and described second modulation signal are periodically variable signal.
Preferably, described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal.
Preferably, the first modulation signal and the second modulation signal are periodically variable signal, and wherein, the frequency of the first modulation signal is greater than the frequency of the second modulation signal.
Preferably, the Voltage Peak peak value of the first modulation signal is greater than the Voltage Peak peak value of the second modulation signal.
Preferably, providing the first pumping signal to described multiple capacitance sensing pole plate, performing fingerprint sensing operation for driving described multiple capacitance sensing pole plate; Thering is provided the second pumping signal to described multiple capacitance sensing pole plate, performing touch operation for driving described multiple capacitance sensing pole plate.
Preferably, described detection method comprises further:
Judge whether described multiple capacitance sensing pole plate is touched, and whether perform fingerprint sensing operation according to the next described multiple capacitance sensing pole plate of corresponding driving of judged result;
If judge, described multiple capacitance sensing pole plate is touched, then switch provide the second modulation signal for the first modulation signal to described earth terminal, switch provide the second pumping signal be the first pumping signal to described multiple capacitance sensing pole plate, perform fingerprint sensing;
If judge, described multiple capacitance sensing pole plate is not touched, then provide the second modulation signal to described earth terminal, provide the second pumping signal to described multiple capacitance sensing pole plate, perform touch-sensing.
More preferably, carried out the touch operation of sensed object object by the electric capacity measured between described multiple capacitance sensing pole plate and target object, judge whether described multiple capacitance sensing pole plate is touched by target object.
Preferably, described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged on the periphery of described multiple capacitance sensing pole plate, and described detection method comprises further:
There is provided described first modulation signal to described guarded electrode.
Preferably, described detection method, by measuring the electric capacity between described multiple capacitance sensing pole plate and target object, carrys out the predetermined information of sensed object object.
Preferably, described predetermined information comprises biological information and/or the touch operation information of target object.
Preferably, described biological information is finger print information.
Preferably, described touch operation information for whether have target object close to or touch described multiple capacitance sensing pole plate.
Preferably, described detection method, by measuring the self-capacitance between described multiple capacitance sensing pole plate and target object, carrys out the predetermined information of sensed object object.
Preferably, described capacitive detection circuit comprises earth terminal and power end, and described detection method comprises further:
There is provided the first power supply signal to described earth terminal;
There is provided second source signal to described power end, the voltage difference of described second source signal and described first power supply signal is the supply voltage of described capacitive detection circuit work.
Preferably, described modulated terminal is the one in described power end and described both earth terminals, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal raises with the voltage rising of described first power supply signal, reduces with the voltage reduction of described first power supply signal.
Preferably, described capacitive detection circuit comprises reference voltage end further, and described detection method comprises further:
There is provided the 3rd power supply signal to described reference voltage end, the voltage of described 3rd power supply signal is between the voltage and the voltage of the first power supply signal of described second source signal;
Wherein, described modulated terminal is the one in described power end, described earth terminal, described reference voltage end three:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal, the 3rd power supply signal all raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal, the 3rd power supply signal all raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal; Or
When described reference voltage end is described modulated terminal, described 3rd power supply signal comprises described first modulation signal, and the voltage of described first power supply signal, second source signal all raises with the rising of the voltage of described 3rd power supply signal, reduces with the reduction of the voltage of described 3rd power supply signal.
The above-mentioned capacitive sensing system of the present invention, electronic equipment, detection method are by providing the first modulation signal, and the first pumping signal changes with the change of the first modulation signal, thus it is higher to improve sensing precision.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the frame structure schematic diagram of electronic equipment better embodiment of the present invention.
The structural representation of the embodiment that Fig. 2 is sensor board shown in Fig. 1.
Fig. 3 is the waveform schematic diagram of the first pumping signal and the first modulation signal.
Fig. 4 is the oscillogram of another embodiment of described first modulation signal.
Fig. 5 is the structural representation of capacitive detection circuit shown in Fig. 1.
Fig. 6 is the electrical block diagram of sensing cell shown in Fig. 5.
Fig. 7 is the electric field line distribution schematic diagram between described sensor board and finger.
Fig. 8 arranges the structural representation of guarded electrode for the sensor board peripheral region shown in Fig. 2.
Fig. 9 is sensor board shown in Fig. 8 and the electric field line distribution schematic diagram between finger.
The front portion schematic diagram of Figure 10 to be packaged type be capacitive detection circuit chip-packaging structure of QFN.
Figure 11 is for the chip-packaging structure of capacitive detection circuit shown in Figure 10 is along the cross-sectional view of XI-XI line.
The front portion schematic diagram of Figure 12 to be packaged type be capacitive detection circuit chip-packaging structure of BGA.
Figure 13 is another structural representation of electronic equipment of the present invention.
Figure 14 is the detection method process flow diagram of capacitive sensing system of the present invention.
Embodiment
As described in background, the sensing precision of the capacitive sensing system of existing electronic equipment is lower, and the many factors that the sensing precision affecting described capacitive sensing system is lower, large quantity research through inventor finds: there is stray capacitance between the earth terminal of described capacitive detection circuit and described sensor board, and described earth terminal loads a constant voltage signal usually, and sensor board loads the voltage signal of constantly change, thus make described stray capacitance there is discharge and recharge, correspondingly, the electric charge that described capacitive detection circuit detects not only comprises the electric charge that the electric capacity that forms between target object and sensor board causes due to change in voltage, also comprise the electric charge that described stray capacitance causes due to the change of voltage, and then impact sensing precision.
Based on above-mentioned research, be the problem that the sensing precision solving described capacitive sensing system is lower, inventor is by a large amount of creative works, and corresponding proposition senses the higher capacitive sensing system of precision and has the electronic equipment of described capacitive sensing system.Wherein, described capacitive sensing system or be touch-sensing system or for biological feature sensing system or for multi-functional sensing system or be the sensing system of other suitable type, described multi-functional sensing system is such as not only performing touch-sensing function but also can perform the system of biological characteristic sensing function.Further, described biological characteristic sensing system is the biological characteristic sensing system of the sensing system such as fingerprint, palmmprint or other suitable type.
Further, in describing the invention, it is to be appreciated that the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In following embodiment, the first modulation signal is modulation signal when sensing for biological characteristic, second modulation signal is the modulation signal for detecting when whether having touch operation, but, understandably, modulation signal called after second modulation signal that also can will be used for when biological characteristic senses, modulation signal called after first modulation signal detected when whether having touch operation will be used for, therefore, do not limit to modulation signal when being only limitted to title " the first modulation signal " into sensing for biological characteristic herein, by title " the second modulation signal " for for detecting modulation signal when whether having touch operation.Similarly, the title of the first power supply signal, second source signal is also interchangeable.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Please refer to Fig. 1, Fig. 1 is the frame structure schematic diagram of electronic equipment better embodiment of the present invention.Described electronic equipment 100 is as being the equipment such as mobile phone, panel computer, GPS navigation system, TV.Described electronic equipment 100 comprises capacitive sensing system 10.Described capacitive sensing system 10 for the predetermined information of sensed object object 1, and determines whether to perform corresponding function according to sensing predetermined information.Described predetermined information comprises biological information or/and touch information.Described biological information comprises finger print information.Described touch information for whether have target object close to or touch described capacitive sensing system 10.Described target object 1 for pointing, also can being the other parts of user's body, as toe etc., even also can be able to be the object of other suitable type, and be not limited to human body.
For described capacitive sensing system 10 for fingerprint sensing system, described fingerprint sensing system is for sensing finger print information, if the finger print information sensed is consistent with the finger print information prestored, then correspondence performs start, unblock, payment, directly calls the functions such as predetermined application; If the finger print information sensed is inconsistent with the finger print information prestored, then do not perform described function.Described predetermined application as being microblogging, micro-letter etc., and all can directly call described predetermined application under described electronic equipment 100 is in the states such as standby, screen locking.
Again or, for described capacitive sensing system 10 for touch-sensing system, described touch-sensing system is used for sensing touch operation, if sense the touch or close of target object 1, then corresponding execution Trigger Function, starts working as the preset device in trigger electronics 100 or starts to perform another work.
Or, for described capacitive sensing system 10 for having the system of touch-sensing and fingerprint sensing two kinds of functions concurrently, first described capacitive sensing system 10 performs touch-sensing function, after sensing touch operation, then switching execution touch-sensing function is fingerprint sensing function, the fingerprint of sensed object object 1, the fingerprint as sensed is consistent with the fingerprint preset, then the corresponding function of corresponding execution.After fingerprint sensing is correct or after repeated detection fingerprint is unsuccessful, described capacitive sensing system 10 switches to touch-sensing function again, thus reach the effect of saving electric energy.
Described capacitive sensing system 10 comprises sensor board 11 and capacitive detection circuit 13.Described sensor board 11 is for being coupled to target object 1 in a capacitive manner to perform sense operation.Described capacitive detection circuit 13 comprises Signal transmissions end T and earth terminal 13a.Described capacitive detection circuit 13, for providing the first pumping signal to described sensor board 11 by described Signal transmissions end T, to drive described sensor 11 plate to perform sense operation, thus obtains the predetermined information of described target object 1.The earth terminal 13a of described capacitive detection circuit 13 is for loading the first modulation signal, and described first pumping signal changes with the change of described first modulation signal.
Described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described first modulation signal.
Because described earth terminal 13a loads the first modulation signal, described first pumping signal changes with the change of described first modulation signal, thus reduces the charge/discharge electricity amount of the stray capacitance C1 between described earth terminal 13a and described sensor board 11.And then the Overlay of described stray capacitance C1 to the electric capacity between described sensor board 11 and target object 1 reduces, and can improve sensing precision.
Described first modulation signal and described first pumping signal are voltage signal.Preferably, the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
More preferably, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.Thus make the charge/discharge electricity amount of the stray capacitance C1 between described earth terminal 13a and described sensor board 11 be 0, correspondingly, described stray capacitance C1 is equivalent to 0.And then described stray capacitance C1 to the folded elimination of the electric capacity between described sensor board 11 and target object 1, thus can further improve sensing precision.
In the present embodiment, described first pumping signal and described first modulation signal are periodically variable signal.So, the present invention does not limit described first pumping signal and described first modulation signal is periodically variable signal, in other embodiments, described first pumping signal and described first modulation signal also can be the signal that aperiodicity changes, as long as the two synchronously changes, the charge/discharge electricity amount of the stray capacitance between earth terminal 13a and sensor board 11 can be reduced.
Preferably, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequency in-phase signal, or be that same width is with frequency in-phase signal, or be homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal, postpone as being 1 nanosecond.
In the present embodiment, described capacitive detection circuit 13, by measuring the electric capacity between sensor board 11 and target object 1, detects the predetermined information of target object 1.Preferably, described capacitive detection circuit 13 loads described first modulation signal by described earth terminal 13a, and provides the first pumping signal changed with described first modulation signal change to carry out self-capacitance detection to described sensor board 11, to realize sense operation.
Refer to Fig. 2, the structural representation of the embodiment that Fig. 2 is sensor board 11 shown in Fig. 1.Described sensor board 11 comprises multiple capacitance sensing pole plate 11a.In the present embodiment, described multiple capacitance sensing pole plate 11a is rectangle, and so, the shape of described multiple capacitance sensing pole plate 11a is not limited thereto, and in other embodiments, described multiple capacitance sensing pole plate 11a also can be Else Rule or irregularly shaped.Preferably, described multiple capacitance sensing pole plate 11a is arranged in induction arrays, for performing sense operation.It should be noted that, described multiple capacitance sensing pole plate 11a can become regular array, as square formation, also can become irregular arrangement.
Preferably, each capacitance sensing pole plate 11a forms a self-capacitance.When target object 1 touch or close to described capacitance sensing pole plate 11a time, electric field near described capacitance sensing pole plate 11a changes, and correspondingly, the self-capacitance of described capacitance sensing pole plate 11a changes.Namely self-capacitance detects is the self-capacitance change that Detection capacitance sensing pole plate 11a causes due to the input of target object 1 (such as fingerprint).
For described capacitive sensing system 10 be fingerprint sensing system, target object 1 corresponds to finger, when point with between described sensor board 11 stable be coupled time, the change of voltage on sensor board 11, the electricity that electric capacity then between sensor board 11 and finger stores changes, by detecting this electric quantity change amount, the size of electric capacity just can be measured.Due to the voltage basic synchronization change on sensor board 11 and earth terminal 13a, the voltage difference between sensor board 11 and earth terminal 13a remains unchanged, then stray capacitance C1 does not have discharge and recharge, thus its equivalent capacity is zero.Like this, the change in voltage of the electric capacity that the electric charge detected by capacitive detection circuit 13 is substantially all directly made up of sensor board 11 and finger causes, and decreases the impact of stray capacitance C1.
Further, when the first modulation signal amplitude that earth terminal 13a applies is larger, then the change in voltage between sensor board 11 and finger is larger, accordingly, sensor board 11 is larger with the charge variation pointing the electric capacity formed, and the quantity of electric charge change that described capacitive detection circuit 13 detects greatly.If noise is constant, then the signal to noise ratio (S/N ratio) of the sensing signal exported from sensor board 11 that capacitive detection circuit 13 detects will linearly increase.So, improve the amplitude peak-to-peak value of the first modulation signal be applied on earth terminal 13a, the signal to noise ratio (S/N ratio) of described capacitive detection system 10 can be increased, such as bring up to 10V, 15V, even 20V.
Refer to Fig. 3, Fig. 3 is the waveform schematic diagram of the first pumping signal and the first modulation signal.Wherein letter ' M ' represents the first pumping signal, and letter " N " represents the first modulation signal.In the present embodiment, be periodically variable square-wave signal for described first modulation signal and the first pumping signal to be described.The low level of described first modulation signal is 0V, and high level is 10V.The low level of described first pumping signal is 1.2V, and high level is 11.2V.So, understandably, change in embodiment at other, high level and the low level of described first modulation signal, the first pumping signal also can be other voltage, and the signal of other suitable type, as sine wave.
Please continue to refer to Fig. 1, described earth terminal 13a is for loading the first power supply signal, and described first power supply signal comprises described first modulation signal.Described capacitive detection circuit 13 comprises power end 13b further, described power end 13b loads second source signal, described second source signal is voltage signal, and the voltage of described power supply signal is higher than the voltage of the first power supply signal, described second source signal changes with the change of described first modulation signal, or described second source signal changes with the change of described first power supply signal.
Voltage difference between described second source signal and described first power supply signal is the supply voltage that described capacitive detection circuit 13 works.Preferably, other voltage in described capacitive detection circuit 13 all raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal.
Correspondingly, the voltage of institute's second source signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal, or the voltage of institute's second source signal raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal.
More preferably, described second source signal and described first modulation signal are homogenous frequency signal, or described second source signal and described first power supply signal are homogenous frequency signal.
In above-mentioned, the square-wave signal only comprising the alternately change of high and low two level for described first modulation signal is illustrated, and so, described first modulation signal is not limited in the alternately change of high and low two level.Described first modulation signal at least comprises the first level and second electrical level and the voltage of described first level is different from the signal of the voltage of described second electrical level.In another embodiment, the first level is high level, such as, be 10V, and second electrical level is low level, such as, be 0V.Change ground, the first level also can be low level, and second electrical level is high level, and the voltage swing of high and low level also can corresponding adjustment according to actual needs.
Described first modulation signal comprises the square-wave signal that the first level and second electrical level alternately occur.Preferably, described first modulation signal is periodically variable square-wave signal.So, described first modulation signal is not limited to square-wave signal, also can be sinusoidal wave, the signal of other suitable type such as triangular wave.Wherein, the voltage condition of described first level and second electrical level is any one in following three kinds of situations:
The voltage of the first: the first level is positive voltage, and the voltage of second electrical level is 0;
The voltage of the second: the first level is 0, and the voltage of second electrical level is negative voltage;
The voltage of the three: the first level is positive voltage, and the voltage of second electrical level is negative voltage, and the absolute value of the voltage of described first level is the same or different than the absolute value of the voltage of described second electrical level.
For the third situation above-mentioned, when the central value of generating positive and negative voltage is just or when being close to the systematically voltage of electronic equipment 100, then it is on average 0V to external voltage or is close to 0V, will significantly reduce the low-frequency excitation that other element in electronic equipment 100 or exterior object cause.Such as, when the level of the first modulation signal is the square wave of 0 to 10 volts, equivalence has the direct current signal of a 5V, and this direct current signal externally will produce electric field, and electric current may be caused to flow through human body or increase external radiation or other device of having influence in electronic equipment 100.
Described capacitive detection circuit 13 is when described earth terminal 13a loads the first level, the first signal is read from described sensor board 11, and when described earth terminal 13a loads second electrical level, read secondary signal from described sensor board 11, obtained the predetermined information of described target object 1 by the first signal of described reading and secondary signal.
Refer to Fig. 4, Fig. 4 is the oscillogram of another embodiment of described first modulation signal.Described first modulation signal comprises described first level, described second electrical level and three level, the voltage of described second electrical level is between the voltage and the voltage of three level of the first level, and described first modulation signal comprises the secondary ladder square-wave signal be made up of the first level, second electrical level, three level three.
Described capacitive detection circuit 13 is when described earth terminal 13a provides the first level to described sensor board 11, the first signal is read from described sensor board 11, when described earth terminal 13a provides second electrical level to described sensor board 11, secondary signal is read from described sensor board 11, when described earth terminal 13a provides three level to described sensor board 11, the 3rd signal is read from described sensor board 11, and at described earth terminal 13a from when providing three level to switch to provide second electrical level, the 4th signal is read from described sensor board 11, by the first signal of described reading, secondary signal, the predetermined information of the 3rd signal and the 4th signal acquisition target object 1.
Referring again to Fig. 1, preferably, described capacitive sensing system 10 comprises control circuit 15 further, the earth terminal 13a of described capacitive detection circuit 13 is electrically connected with described control circuit 15, and described control circuit 15 is for applying the earth terminal 13a of described first modulation signal to described capacitive detection circuit 13.
Further, the power end 13b of described capacitive detection circuit 13 is electrically connected with described control circuit 15, and described control circuit 15 is consistent for the voltage difference controlled between the power end 13b of described capacitive detection circuit 13 and earth terminal 13a.Described control circuit 15 provides described first power supply signal to described earth terminal 13a, provides second source signal to described power end 13b, thus provides required supply voltage for described capacitive detection circuit 13 normally works.
Described control circuit 15 comprises earth terminal 15a, power end 15b, the first output terminal 15c, the second output terminal 15d.Wherein, the first output terminal 15c is connected with the earth terminal 13a of described capacitive detection circuit 13, for exporting described first power supply signal to described earth terminal 13a.Described second output terminal 15d is connected with the power end 13b of described capacitive detection circuit 13, for exporting described second source signal to described power end 13b.The voltage of the earth terminal 15a of described control circuit 15 be 0 volt or for described electronic equipment 100 systematically voltage or be constant voltage.The power end 15b of described control circuit 15 is for receiving supply voltage.In addition, communication interface (sign) is also set, to carry out information communication between described control circuit 15 and described capacitive detection circuit 13.
Please continue to refer to Fig. 1, preferably, described electronic equipment 100 comprises main control chip 20 further, described main control chip 20 is connected with earth terminal 15a, the power end 15b of described control circuit 15, for providing systematically voltage and supply voltage for described governor circuit 15, for described control circuit 15 is powered.In addition, between described main control chip 20 and described control circuit 15, be provided with communication interface (sign) further, to carry out information communication.Described systematically voltage is generally the voltage of the negative pole of the power supply of electronic equipment 100.Power supply is as being battery.
Refer to Fig. 5, Fig. 5 is the structural representation of capacitive detection circuit 13 shown in Fig. 1.Described capacitive detection circuit 13 comprises multiple sensing cell 13c and multiple selection unit 13d further.Each sensing cell 13c is connected to multiple capacitance sensing pole plate 11a respectively by a selection unit 13d.Described selection unit 13d is used for when capacitive detection circuit 13 works, the quantity that corresponding control capacitance sensing pole plate 11a is electrically connected with sensing cell 13.In the present embodiment, each selection unit 13d comprises switch S (not shown).Described switch S is connected with described sensing cell 13c and at least one capacitance sensing pole plate 11a respectively.
When described capacitive detection circuit 13 provides the first pumping signal to described capacitance sensing electrode 11a, by described selection unit 13d, each sensing cell 13c can be selected all to conduct with the capacitance sensing pole plate 11a be connected, thus, make described first pumping signal export to all capacitance sensing pole plate 11a simultaneously.So, in other embodiments, also by described selection unit 13d, each control section capacitance sensing pole plate 11a and described multiple sensing cell 13c conducts, so, after repeatedly selecting, each sensing cell 13c passes through with the equal conductance of capacitance sensing pole plate 11a be connected, thus, make described first pumping signal timesharing export to described multiple capacitance sensing pole plate 11a.
When described capacitive detection circuit 13 receives the sensing signal of described multiple capacitance sensing pole plate 11a output, by described selection unit 13d, only control each sensing cell 13c at every turn and be electrically connected with a capacitance sensing pole plate 11a respectively, receive sensing signal.So, by repeatedly controlling, obtain the sensing signal that all capacitance sensing pole plate 11a export.So, in other embodiments, also can control each sensing cell 13c at every turn and be electrically connected with multiple (as 2) capacitance sensing pole plate 11a respectively, receive sensing signal.Correspondingly, described capacitive detection circuit 13 obtains the predetermined information of target object 1 by the sensing signal received.
Refer to Fig. 6, Fig. 6 is the electrical block diagram of the 13c of sensing cell shown in Fig. 5.Described sensing cell 13c comprises operational amplifier 131, feedback branch 133 and computing unit 135.Described operational amplifier 131 comprises in-phase end a, end of oppisite phase b and output terminal d.Described feedback branch 133 is connected between end of oppisite phase and output terminal.Described computing unit 135 is connected with described output terminal d.Described feedback branch 133 comprises a feedback capacity Cf, and described feedback capacity Cf is connected between end of oppisite phase b and output terminal d.
The in-phase end a of described operational amplifier 131 receives a reference voltage Vref.Described reference voltage Vref is provided by a generating circuit from reference voltage 19.It should be noted that, described generating circuit from reference voltage 19 can be the circuit in described capacitive detection system 10, also can be another circuit in described electronic equipment 100.The end of oppisite phase b of described operational amplifier 131 is then connected with capacitance sensing pole plate 11a by described selection unit 13d.Described operational amplifier is electrically connected respectively with described power end 13b and earth terminal 13a further.
When capacitive detection circuit 13 works, described operational amplifier 131 is in empty short status, and namely in-phase end 13a and end of oppisite phase 13b is equivalent to short circuit, and the two current potential is identical, and namely the current potential of in-phase end a is also reference voltage Vref.Further, described reference voltage Vref changes with the change of the first modulation signal received by earth terminal 13a.Thus, when earth terminal 13a exports the first modulation signal to operational amplifier 131, the current potential of in-phase end a and end of oppisite phase b changes with the change of the first modulation signal, correspondingly, the first pumping signal that the capacitance sensing pole plate 11a conducted with the end of oppisite phase b of operational amplifier 131 then receives changes with the change of the first modulation signal.
When target object 1 is close or when touching described capacitance sensing pole plate 11a, then the charge variation occurred is transferred to computing unit 135 by the feedback capacity Cf be connected with end of oppisite phase b.Described computing unit 135 obtains the predetermined information of target object 1 according to charge variation situation correspondence.In the present embodiment, calculate predetermined information with charge variation, in other embodiments, also obtain predetermined information by calculating voltage change.
For described capacitive sensing system 10 for fingerprint sensing system, each capacitance sensing pole plate 11a can detect the size pointing the electric capacity be coupled with it.There is ridge and paddy in finger print, ridge compares paddy closer to described sensor board 11, and thus electric capacity is larger; Paddy compares ridge further from described sensor board 11, and thus electric capacity is less.Form the size of electric capacity according to capacitance sensing pole plate 11a and finger print, ridge and the paddy of the fingerprint on region corresponding to each capacitance sensing pole plate 11a can be detected.
In order to read finger print information more accurately, usual sensor board 11 is designed to array-like, and the distance at capacitance sensing pole plate 11a adjacent thereto center, a capacitance sensing pole plate 11a center is approximately 50um.In order to reach such precision, semiconductor technology is usually adopted directly to realize sensor board 11 and capacitive detection circuit 13 on the integrated.For the ease of design, again control circuit 15 and capacitive detection circuit 13 are separated, be designed to control chip and capacitance detecting chip respectively, wherein capacitance detecting chip comprises sensor board 11 and capacitive detection circuit 13.Usual finger ten several millimeters of scopes, such finger, usual corresponding multiple capacitance sensing pole plate 11a.In order to reduce cost, conserve space, even if place multiple capacitance sensing pole plate 11a, its quantity is also quite limited, and be such as 160 × 64 capacitance sensing pole plate 11a, its area is about 8mm × 3.2mm.And point area usually much larger than the area of sensor board 11.The electric field schematic diagram that finger and sensor board 11 are formed is as Fig. 6.
Refer to Fig. 7, Fig. 7 is the electric field line distribution schematic diagram between described sensor board 11 and finger.According to the physics law of Electric Field Distribution, the electric field between the capacitance sensing pole plate 11a of described sensor board 11 periphery and described target object 1 is different from the electric field between the middle capacitance sensing pole plate 11a of described sensor board 11 and described target object 1.As seen from Figure 7, middle Electric Field Distribution is relatively more even, and the electric field of periphery is dispersed, and causes the finger print information of acquisition to have distortion phenomenon at edge thus.
In order to solve the problem of finger print information at edge distortion, the present invention proposes the technical scheme arranging guarded electrode 17 (seeing below Fig. 8) in described capacitive sensing system 10 further.Described guarded electrode 17 is made up of conductive materials, as being metal or other conductive material.Described guarded electrode 17 is at least arranged at around described induction arrays.Described guarded electrode 17 receives electric signal, but described guarded electrode 17 be not used in execution measuring ability, and correspondingly, described guarded electrode 17 does not export data.
See also Fig. 8 and Fig. 9, Fig. 8 arranges the structural representation of guarded electrode 17 for sensor board 11 peripheral region shown in Fig. 2.Fig. 9 is sensor board 11 shown in Fig. 8 and the electric field line distribution schematic diagram between finger.In the present embodiment, described guarded electrode 17 is electrically connected with the earth terminal 13a of the capacitive detection circuit 13 shown in Fig. 1.Described guarded electrode 17 receives described first power supply signal.Correspondingly, the voltage of described guarded electrode 17 and described sensor 11 voltage basic synchronization change.Thus as shown in Figure 8, the electric field of described sensor board 11 periphery is equally even with the electric field at middle part, can improve the quality of gathered predetermined information.
So, the present invention is not limited thereto, in other embodiments, described guarded electrode 17 also can be connected with another signal circuit (not shown) in described electronic equipment 100, and described signal circuit provides the signal identical with earth terminal 13a or the signal identical with sensor board 11 to described guarded electrode 17.
Further, in the present embodiment, described guarded electrode 17 is the electrode of a middle hollow out, the void region of the corresponding described guarded electrode 17 of described sensor 11 plate is arranged, preferably, described guarded electrode 17 is a closed ring electrode, is surrounded on described sensor board 11 around.So, in other embodiments, described guarded electrode 17 also can comprise multiple electrode, and is distributed in described sensor board 11 around; Or described guarded electrode 17 is a flood electrode or multiple electrode, itself and the stacked setting of described sensor board 11, and along the direction of stacked vertical, the periphery of described guarded electrode 17 exceeds the periphery of described sensor board 11.
Further, inventor is found by large quantity research, if additionally arrange guarded electrode 17 not only can increase the volume weight of capacitive sensing system 10 but also can increase outside manufacturing cost, correspondingly, inventor is by a large amount of creative works, the conducting element finding to utilize described capacitive sensing system 10 itself to exist multiplexing double do described guarded electrode 17 or/and utilize making itself to exist conducting element while the conductive material that cuts of utilization needs make described guarded electrode 17 simultaneously, be described as follows.
Preferably, described capacitive detection circuit 13 is integrated in a capacitive detection circuit chip, and described control circuit 15 is integrated in a control circuit chip.Described capacitive detection circuit chip and described control circuit chip or be encapsulated in an integrated antenna package, or be encapsulated in respectively in two integrated antenna packages.
Different according to the packaged type of capacitive detection circuit chip, now be respectively quad flat non-pin package (Quad Flat No-lead Package with packaged type, be called for short QFN) be described with BGA Package (Ball Grid Array Package is called for short BGA).So, being not limited to this two kinds of packaged types, also can be other packaged type.
Packaged type QFN
Please also refer to Figure 10 and Figure 11, the front portion schematic diagram of Figure 10 to be packaged type be capacitive detection circuit chip-packaging structure of QFN.Figure 11 is for the chip-packaging structure of capacitive detection circuit shown in Figure 10 is along the cross-sectional view of XI-XI line.Described capacitive detection circuit chip-packaging structure 30 comprises heat sink 31, wire 32, lead frame (lead frame) 33, lead frame 35, capacitive detection circuit chip 37.Described lead frame 35 is made up of conductive material, is positioned at around described capacitive detection circuit chip 37, and is connected by wire 32 with capacitive detection circuit chip 37, is described capacitive detection circuit chip 37 signal transmission.
Further, capacitive detection circuit chip 37 and the stacked setting of heat sink 31, and along the direction of stacked vertical, the edge of heat sink 31 exceeds the periphery of described capacitive detection circuit chip 37.Described heat sink 31 is made up of conductive material, and it is for heat radiation, and in addition, described heat sink 31 is further used for being electrically connected with described earth terminal 13a, is also used as described guarded electrode 17.Because heat sink 31 is multiplexing as guarded electrode 17, without the need to additionally making guarded electrode 17 again, thus the small volume of capacitive sensing system 10, lighter in weight and manufacturing cost is lower.
Or, when making lead frame 35, being made by the same layer material making lead frame 35 and forming described guarded electrode 17, preferably, also make while making lead frame 35 and form described guarded electrode 17, thus save processing procedure, saving material, thus save cost.The position of described guarded electrode 17 between described heat sink 17 and described lead frame 35, or jointly coordinate with lead frame 35 and arrange around described heat sink 31.
In the present embodiment, described heat sink 31 is positioned at same layer with lead frame 35.Change ground, described guarded electrode 17 also can be made by the same layer material making heat sink 31 simultaneously and be formed.
BGA Package BGA
Refer to Figure 12, the front portion schematic diagram of Figure 12 to be packaged type be capacitive detection circuit chip-packaging structure of BGA.Described capacitive detection circuit chip-packaging structure 40 comprises substrate 41, capacitive detection circuit chip 43, guarded electrode 17.Described capacitive detection circuit chip 43 is arranged on described substrate 41 with guarded electrode 17, and preferably, described capacitive detection circuit chip 43 and guarded electrode 17 are positioned at the same side of described substrate 41.Described guarded electrode 17 is arranged on around described capacitive detection circuit chip 43.Described substrate 41 is such as printed circuit board (PCB) or flexible circuit board.
Further, in other embodiments, described capacitive detection system 10 comprises two kinds of detecting patterns, is respectively the first detecting pattern and the second detecting pattern.Described capacitive detection circuit 10 removes for when described earth terminal 13a loads described first modulation signal, the first pumping signal changed with the change of described first modulation signal is provided to drive described sensor board 11 to perform outside the first detecting pattern, also be further used for when described earth terminal 13a loads the second modulation signal, the second pumping signal changed with the change of described second modulation signal is provided to drive described sensor board 11 to perform the second detecting pattern, wherein, first modulation signal is different from the second modulation signal, second pumping signal is different from the first pumping signal.The first power supply signal that described control circuit 15 is supplied to described earth terminal 13a comprises described second modulation signal.
Described capacitive sensing system 10 by performing first, second detecting pattern described respectively, and then can perform the different sense operation of at least two kinds of functions, thus increases the sensing function of described capacitive sensing system 10, strengthens the availability of electronic equipment 100.
Preferably, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described second modulation signal.
Described second modulation signal, the second pumping signal are voltage signal, preferably, the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal, or the voltage of described second pumping signal raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal.
More preferably, the changes in amplitude size of described second pumping signal is identical with the changes in amplitude size of the second modulation signal.
Preferably, described second pumping signal and described second modulation signal are periodically variable signal.
Described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequency in-phase signal, or be same width with in-phase signal frequently, or for homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal, postpone as being 1 nanosecond.
Described second modulation signal at least comprises the 4th level and the 5th level, and wherein, the voltage of the 4th level is different from the voltage of the 5th level.
Further, inventor is pinpointed the problems by large quantity research: earth terminal 13a and electronic equipment 100 are systematically, as earth terminal 15a, between also there is stray capacitance C2 (see Fig. 1), when encouraging earth terminal 13a, this stray capacitance C2 can be encouraged, when stray capacitance C2 is larger simultaneously, when excitation frequency is higher, then can produce larger power consumption.Inventor is found by a large amount of performing creative labours, can reduce power consumption in the following way.
When described capacitive sensing system 10 works, first perform the second detecting pattern, when the scheduled operation of the target object that described capacitive sensing system senses, just starting the first detecting pattern or switching the second detecting pattern is that the first detecting pattern carries out detection operation, wherein, the second detecting pattern saves power consumption compared to the first detecting pattern.
Correspondingly, described second pumping signal changes with the change of described second modulation signal, except the charge/discharge electricity amount in order to reduce stray capacitance between described sensor board and described earth terminal, and also can further in order to reduce the power consumption of capacitive sensing system 10.
Preferably, the frequency of the second pumping signal is less than the frequency of the first pumping signal, or/and the Voltage Peak peak value of the second pumping signal is less than the Voltage Peak peak value of the first pumping signal, thus reaches the object reducing power consumption.
Accordingly, the frequency of the second modulation signal is less than the frequency of the first modulation signal, or/and the Voltage Peak peak value of the second modulation signal is less than the Voltage Peak peak value of the first modulation signal, thus also can reduce power consumption further.Such as, for the first detecting pattern be fingerprint sensing pattern, the second detecting pattern for touch detecting pattern be described.When described capacitive sensing system 10 is in touch detecting pattern, described capacitive detection circuit 13 touches detection operation for driving described sensor board 11 to perform, and sensed object object 1 is to the touch of described sensor board 11; When described capacitive sensing system 10 is in fingerprint detection pattern, described capacitive detection circuit 13 performs fingerprint detection operation, the fingerprint of sensed object object 1 for driving described sensor board 11.
Described capacitive detection circuit 13 carrys out sensing touch by the electric capacity measured between sensor board 11 and target object 1 and operates, during detection: first carry out touch and detect, detect and touched when occurring, restarted fingerprint detection or switch touch and be detected as fingerprint detection, saved the object of power consumption to reach.
Particularly, described capacitive detection circuit 13 judges whether described sensor board 11 is touched;
If so, then switch provide the second modulation signal for the first modulation signal to described earth terminal 13a, switch provide the second pumping signal be the first pumping signal to described sensor board 11, perform fingerprint sensing;
If not, then provide the second modulation signal to described earth terminal 13a, provide the second pumping signal to described sensor board 11, perform touch-sensing.When described capacitive sensing system 10 is in touch detecting pattern, to both described second modulation signal, the second pumping signal one of them or all adopt 1V Voltage Peak peak value, occur for detecting whether to have to touch, such as, the Voltage Peak peak value of the second pumping signal is 1V, and the Voltage Peak peak value of the second modulation signal is 1V; When holding formula sensing system 10 and being in fingerprint detection pattern, to both the first modulation signal, the first pumping signal one of them or all adopt 10V Voltage Peak peak value, for detecting fingerprint, such as, the Voltage Peak peak value of the first pumping signal is 10V, and the Voltage Peak peak value of the first modulation signal is 10V.Thus reach the object of the power consumption reducing described capacitive sensing system 10, correspondingly, the power consumption with the electronic equipment 100 of described capacitive sensing system 10 is also less.
In addition, preferably, described first pumping signal and described second pumping signal are periodically variable signal, and wherein, the frequency of the first pumping signal is greater than the frequency of the second pumping signal.Accordingly, the first modulation signal and the second modulation signal are periodically variable signal, and wherein, the frequency of the first modulation signal is greater than the frequency of the second modulation signal.When performing touch and detecting, the frequency of the second pumping signal and the second modulation signal is as being 100KHz.When performing fingerprint detection, the frequency of the first pumping signal and the first modulation signal is as being 1MHz.Thus, the power consumption of described capacitive sensing system 10 is reduced further.
When capacitive sensing system 10 is in touch detecting pattern, only detect to touch and whether occur, do not need the so high resolution of picture fingerprint recognition, therefore, the even all capacitance sensing pole plate 11a of multiple capacitance sensing pole plate 11a can connect together and detect.
Preferably, capacitive sensing system 10 of the present invention is the sensing system saving driving ring.In prior art, a kind of capacitive sensing system comprises driving ring, sensor board, capacitive detection circuit.By applying excitation on driving ring, driving ring directly contacts finger, and on driving ring, excitation is transmitted to finger, drives finger current potential to change.This scheme, needs increase driving ring on the one hand, adds cost; Driving ring to apply too high voltage on the other hand, such as 4V.When overtension, electric current flows through people's cognition and causes uncomfortable sensation.Usually, voltage is higher, then signal energy is larger, then the signal to noise ratio (S/N ratio) of the signal received is higher, and system performance is better.This scheme limits the performance of whole system scheme.Relatively, capacitive sensing system 10 design comparison of the present invention is flexible, and better performances, cost is lower, and comfort when human body also contacts is higher.
It should be noted that; the above-mentioned technical scheme of the multiplexing guarded electrode 17 of conducting element in capacitive sensing system 10 that utilizes own is also not limited in the capacitive sensing system 10 saving driving ring; also in other suitable capacitive sensing system applicable; as with in this capacitive sensing system of driving ring; for one of ordinary skill in the art; it is rationally to release relevant technical scheme according to guidance of the present invention, instruction, should all belong to disclosed protection domain.
Refer to Figure 13, Figure 13 is another structural representation of electronic equipment 100 of the present invention.Described electronic equipment 100 comprises display device 50, control knob 60, housing 70 further.Described capacitive sensing system 10 or be arranged in the viewing area of described display device 50, or be arranged at below described control knob 60, or be arranged in described housing 70.
In addition, change ground, also can load the first modulation signal at described power end, described earth terminal correspondence is applied with the first modulation signal change and the signal of change, can solve the impact of described stray capacitance equally.
(2) in addition, in the capacitive detection circuit had, also there is reference voltage end.Described reference voltage end loads the 3rd power supply signal, and the voltage of the 3rd power supply signal is between the voltage and the voltage of second source signal of described first power supply signal.
Similarly, also can load the first modulation signal in described reference voltage end, described earth terminal is applied with the first modulation signal change and the signal of change, can solve the impact of described stray capacitance equally.
(3) similarly, also described first modulation signal can be loaded by other certain Single port in the capacitive detection circuit of capacitive sensing system, described earth terminal is applied with the first modulation signal change and the signal of change, can solve the impact of described stray capacitance equally.
In view of above-mentioned (one) (two) (three), there is a modulated terminal in definition capacitive detection circuit, this modulated terminal loads with described time dependent first modulation signal, described modulated terminal or be earth terminal, or be other port, when for other port, voltage corresponding change with the change of described first modulation signal of described earth terminal.
Accordingly, the present invention further provides another kind of capacitive sensing system and there is the electronic equipment of described capacitive sensing system.Capacitive sensing system described herein, electronic equipment and above-mentioned capacitive sensing system 10, electronic equipment 100 are similar, therefore, in order to concise explanation, explanation about capacitive sensing system herein, electronic equipment is not furnished with relevant drawings, and element identical with title in capacitive sensing system 10, electronic equipment 100 in the capacitive sensing system that following content relates to and electronic equipment can be same with reference to accompanying drawing 1-13.
Described capacitive sensing system comprises:
Sensor board, for being coupled to target object to perform sense operation with capacitive coupling;
Capacitive detection circuit, described capacitive detection circuit comprises Signal transmissions end and modulated terminal, described capacitive detection circuit is used for providing the first pumping signal to described sensor board by described Signal transmissions end, sense operation is performed to drive described sensor board, the modulated terminal of described capacitive detection circuit is for loading the first modulation signal, and described first pumping signal changes with the change of described first modulation signal.
Wherein, described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described modulated terminal with the change of described first modulation signal.
Further, other voltage in described capacitive detection circuit all changes with the change of the voltage of described modulated terminal.Preferably, other voltage in described capacitive detection circuit all raises with the rising of the voltage of described modulated terminal, reduces with the reduction of the voltage of described modulated terminal.
Preferably, described first modulation signal and described first pumping signal are voltage signal, and the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
More preferably, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.Preferably, described first pumping signal and described first modulation signal are periodically variable signal.
More preferably, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal.
Described capacitive detection circuit comprises power end, earth terminal, described earth terminal is for loading the first power supply signal, described power end is for loading second source signal, and the voltage difference between second source signal and the first power supply signal is the supply voltage of described capacitive detection circuit work.
In one embodiment, described modulated terminal is the one in described power end and described both earth terminals, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and described first power supply signal changes with the change of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal raises with the voltage rising of described first power supply signal, reduces with the voltage reduction of described first power supply signal.
Described capacitive detection circuit comprises reference voltage end further, and described reference voltage end is for loading the 3rd power supply signal, and the voltage of described 3rd power supply signal is between the voltage and the voltage of the first power supply signal of described second source signal.
In another embodiment, described modulated terminal is the one in described power end, described earth terminal, described reference voltage end three, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and described first power supply signal, the 3rd power supply signal all change with the change of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and described second source signal, the 3rd power supply signal all change with the change of described first power supply signal; Or
When described reference voltage end is described modulated terminal, described 3rd power supply signal comprises described first modulation signal, and described first power supply signal, second source signal all change with the change of described 3rd power supply signal.
Described first modulation signal at least comprises the first level and second electrical level, and the voltage of described first level is different from the voltage of described second electrical level.
described capacitive sensing system except for when described modulated terminal loads the first modulation signal, the first pumping signal be provided drive described sensor board to perform the first detecting pattern except, also be further used for when described modulated terminal loads the second modulation signal, the second pumping signal is provided to drive described sensor board to perform the second detecting pattern, wherein, the first modulation signal is different from the second modulation signal, the first pumping signal is different from the second pumping signal.
Wherein, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described second modulation signal.
Preferably, described second modulation signal and described second pumping signal are voltage signal, and the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal.
More preferably, the changes in amplitude size of described second pumping signal is corresponding identical with the changes in amplitude size of described second modulation signal.
Preferably, described second pumping signal and described second modulation signal are periodically variable signal.
More preferably, described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal.
Wherein, in one embodiment, in described first detecting pattern and described second detecting pattern, one is fingerprint detection pattern, another kind of for touching detecting pattern, wherein, when described capacitive sensing system is in touch detecting pattern, whether described capacitive detection circuit touches detection operation for driving described sensor board to perform, sense and have target object to touch described sensor board; When described capacitive sensing system is in fingerprint detection pattern, described capacitive detection circuit performs fingerprint detection operation for driving described sensor board, and whether the fingerprint of sensed object object is preset fingerprint.
Described capacitive detection circuit is used for performing self-capacitance to described sensor board and detects.
Described second modulation signal comprises the 4th level and the 5th level, and the voltage of described 4th level is different from the voltage of described 5th level.
First modulation signal and the second modulation signal are periodically variable signal, and wherein, the frequency of the first modulation signal is greater than the frequency of the second modulation signal.Described first pumping signal and the second pumping signal are periodically variable signal, and wherein, the frequency of the first pumping signal is greater than the frequency of the second pumping signal.
First level of the first modulation signal and the Voltage Peak peak value of second electrical level are greater than the 4th level of the second modulation signal and the Voltage Peak peak value of the 5th level.The Voltage Peak peak value of the first pumping signal is greater than the Voltage Peak peak value of the second pumping signal.
Described capacitive detection circuit carrys out sensing touch by the electric capacity measured between sensor board and target object and operates, and described capacitive detection circuit judges whether described sensor board is touched;
If so, then switch provide the second modulation signal for the first modulation signal to described earth terminal, switch provide the second pumping signal be the first pumping signal to described sensor board to perform fingerprint sensing;
If not, then provide the second modulation signal to described earth terminal, provide the second pumping signal to described sensor board, perform to touch and detect.Thus, first can perform touch-sensing, then according to whether having touch operation to determine whether performing fingerprint sensing, and then save power consumption.
Described capacitive sensing system comprises control circuit further, and described control circuit is connected respectively with described power end, earth terminal, for providing described second source signal for described power end, for described earth terminal provides the first power supply signal.Described capacitive sensing system is the fingerprint sensing system saving driving ring.
Described sensor board comprises multiple capacitance sensing pole plate, and described capacitive detection circuit performs sense operation by the capacitance size measured between described multiple capacitance sensing pole plate and target object, obtains the predetermined information of target object.
Described predetermined information comprises biological information and/or touch operation information.
Described biological information comprises fingerprint, palmmprint.
Described touch operation information is whether described sensor board has by operation information that is close or that touch.
Preferably, described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged at around described sensor board.
Described guarded electrode is electrically connected to described modulated terminal, and described guarded electrode receives described first power supply signal.
Described capacitive sensing system comprises heat sink further, and described heat sink is used for dispelling the heat to described capacitive sensing system, and described heat sink is also for as described guarded electrode.
It should be noted that, the key distinction of capacitive sensing system described herein and above-mentioned capacitive sensing system 10 is: described modulated terminal is not limited to described earth terminal 13a, also may is power end 13b, reference voltage end or other port.And for other structure, capacitive sensing system described herein can be identical or different from above-mentioned capacitive sensing system 10.
Refer to Figure 14, Figure 14 is the detection method process flow diagram of capacitive sensing system of the present invention.Described detection method is applicable to the capacitive sensing system described in the respective embodiments described above, and so, be suitable for the capacitive sensing system of other suitable type, the present invention does not do concrete restriction yet.Described capacitive sensing system comprises multiple capacitance sensing pole plate and capacitive detection circuit, and described capacitive detection circuit comprises modulated terminal, and described detection method comprises:
S1: provide the first pumping signal to described multiple capacitance sensing pole plate, drives described multiple capacitance sensing pole plate to perform sense operation;
S2: provide the first modulation signal to described modulated terminal, wherein, described first pumping signal changes with the change of described first modulation signal.
It should be noted that, described multiple capacitance sensing pole plate is used for being coupled to target object in a capacitive manner, by performing sense operation, to obtain the predetermined information of described target object.
Preferably, described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described multiple capacitance sensing pole plate and described modulated terminal with the change of described first modulation signal.
Further, other voltage in described capacitive detection circuit all changes with the change of the voltage of described first modulation signal.
Preferably, described first modulation signal and described first pumping signal are voltage signal, and the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
More preferably, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.
Preferably, described first pumping signal and described first modulation signal are periodically variable signal.
More preferably, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal.
Described detection method comprises further:
The second pumping signal is provided to perform sense operation to described multiple capacitance sensing pole plate;
There is provided the second modulation signal to described modulated terminal, wherein, described second pumping signal changes with the change of described second modulation signal.Described second pumping signal is different from described first pumping signal, and described second modulation signal is different from described first modulation signal.Thus, drive described capacitive sensing system to perform two kinds of different detecting patterns, be respectively the first detecting pattern and the second detecting pattern.Particularly, the first detecting pattern correspondence provides the first pumping signal to described multiple capacitance sensing pole plate, provides the first modulation signal to described modulated terminal; Second detecting pattern correspondence provides the second pumping signal to described multiple capacitance sensing pole plate, provides the second modulation signal to described modulated terminal.Correspondingly, described capacitive sensing system is made to increase sensing function.
Preferably, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described multiple capacitance sensing pole plate and described modulated terminal with the change of described second modulation signal.
Preferably, described second modulation signal and described second pumping signal are voltage signal, and the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal.
More preferably, the changes in amplitude size of described second pumping signal is corresponding identical with the changes in amplitude size of described second modulation signal.
Preferably, described second pumping signal and described second modulation signal are periodically variable signal.
More preferably, described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequently in-phase signal, or be same width with in-phase signal frequently, or be homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal.
Preferably, comparatively the first detecting pattern power saving of second detecting pattern, when detecting, described capacitive sensing system is first driven to perform the second detecting pattern, under the second detecting pattern, after sensing the scheduled operation of target object, restarting the first detecting pattern or switching the second detecting pattern is the first detecting pattern, thus saves electric energy.
In order to save power consumption, preferably, the frequency of the first modulation signal is greater than the frequency of the second modulation signal; Or/and
The Voltage Peak peak value of the first modulation signal is greater than the Voltage Peak peak value of the second modulation signal.
Such as, described detection method provides the first pumping signal to described multiple capacitance sensing pole plate, performs fingerprint sensing operation for driving described multiple capacitance sensing pole plate; Thering is provided the second pumping signal to described multiple capacitance sensing pole plate, performing touch operation for driving described multiple capacitance sensing pole plate.
Particularly, described detection method carrys out the touch operation of sensed object object by the electric capacity measured between described multiple capacitance sensing pole plate and target object, judges whether described multiple capacitance sensing pole plate is touched by target object;
If so, then switch provide the second modulation signal for the first modulation signal to described earth terminal, switch provide the second pumping signal be the first pumping signal to sensor board, perform fingerprint sensing;
If not, then provide the second modulation signal to described earth terminal, provide the second pumping signal to described sensor board, perform touch-sensing.
Wherein, when performing touch detection, the Voltage Peak peak value of the first pumping signal is 10V, and frequency is 1MHz, and accordingly, the Voltage Peak peak value of the first modulation signal is 10V, and frequency is 1MHz; Relatively, the Voltage Peak peak value of the second pumping signal is 1V, and frequency is 100KHz, and accordingly, the Voltage Peak peak value of the second modulation signal is 1V, and frequency is 100KHz.Visible, under touch detecting pattern, the electric energy of capacitive sensing system consumption is less than the electric energy that fingerprint detection mode capacitance formula sensing system consumes, thus performs by first performing to touch to detect the power consumption that fingerprint detection reduces capacitive sensing system again.
Described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged on the periphery of described multiple capacitance sensing pole plate, and preferably, described detection method comprises further:
There is provided described first modulation signal to described guarded electrode.Thus the accuracy of the predetermined information of the target object that described multiple capacitance sensing pole plate obtains can be improved.
Preferably, described detection method, by measuring the electric capacity between described multiple capacitance sensing pole plate and target object, carrys out the predetermined information of sensed object object.
Described predetermined information comprises biological information and/or the touch operation information of target object.
Wherein, described biological information is finger print information.
Wherein, described touch operation information for whether have target object close to or touch described multiple capacitance sensing pole plate.
More preferably, described detection method, by measuring the self-capacitance between described multiple capacitance sensing pole plate and target object, carrys out the predetermined information of sensed object object.
Described capacitive detection circuit comprises earth terminal and power end, and described detection method comprises further:
There is provided the first power supply signal to described earth terminal;
There is provided second source signal to described power end, the voltage difference of described second source signal and described first power supply signal is the supply voltage of described capacitive detection circuit work.
In one embodiment, described modulated terminal is the one in described power end and described both earth terminals, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal raises with the voltage rising of described first power supply signal, reduces with the voltage reduction of described first power supply signal.
Described capacitive detection circuit comprises reference voltage end further, and described detection method comprises further:
There is provided the 3rd power supply signal to described reference voltage end, the voltage of described 3rd power supply signal is between the voltage and the voltage of the first power supply signal of described second source signal.
In another embodiment, described modulated terminal is the one in described power end, described earth terminal, described reference voltage end three:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal, the 3rd power supply signal all raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal, the 3rd power supply signal all raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal; Or
When described reference voltage end is described modulated terminal, described 3rd power supply signal comprises described first modulation signal, and the voltage of described first power supply signal, second source signal all raises with the rising of the voltage of described 3rd power supply signal, reduces with the reduction of the voltage of described 3rd power supply signal.
Preferably, above-mentioned modulated terminal is earth terminal.
The above-mentioned detection method of the present invention can make the equivalent capacity of the stray capacitance between described modulated terminal and described multiple capacitance sensing pole plate diminish, thus improves sensing precision.In addition, by first performing touch-sensing, then determine whether perform fingerprint sensing, thus also can reduce the power consumption of capacitive sensing system further.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (127)

1. a capacitive sensing system, comprising:
Sensor board, for being coupled to target object in a capacitive manner to perform sense operation;
Capacitive detection circuit, described capacitive detection circuit comprises Signal transmissions end and earth terminal, described capacitive detection circuit is used for providing the first pumping signal to described sensor board by described Signal transmissions end, sense operation is performed to drive described sensor board, the earth terminal of described capacitive detection circuit is for loading the first modulation signal, and described first pumping signal changes with the change of described first modulation signal.
2. capacitive sensing system according to claim 1, is characterized in that, described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described first modulation signal.
3. capacitive sensing system according to claim 1, it is characterized in that, described first modulation signal and described first pumping signal are voltage signal, and the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
4. capacitive sensing system according to claim 3, is characterized in that, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.
5. capacitive sensing system according to claim 1, is characterized in that, described first pumping signal and described first modulation signal are periodically variable signal.
6. capacitive sensing system according to claim 1, it is characterized in that, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequency in-phase signal, or be same width with in-phase signal frequently, or for homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal.
7. capacitive sensing system according to claim 3, it is characterized in that, described earth terminal is for loading the first power supply signal, described first power supply signal comprises described first modulation signal, described capacitive detection circuit comprises power end further, described power end is for loading second source signal, the voltage of second source signal is higher than the voltage of the first power supply signal, described second source signal changes with the change of described first modulation signal, or described second source signal changes with the change of described first power supply signal.
8. capacitive sensing system according to claim 7, is characterized in that, described second source signal and described first modulation signal are homogenous frequency signal, or described second source signal and described first power supply signal are homogenous frequency signal.
9. capacitive sensing system according to claim 7, it is characterized in that, described first power supply signal, described second source signal are voltage signal, the voltage of institute's second source signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal, or the voltage of institute's second source signal raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal.
10. capacitive sensing system according to claim 7, is characterized in that, the voltage difference between described second source signal and described first power supply signal is the supply voltage of described capacitive detection circuit work.
11. capacitive sensing systems according to claim 10, is characterized in that, other voltage in described capacitive detection circuit all raises with the rising of the voltage of described first power supply signal, reduce with the reduction of the voltage of described first power supply signal.
12. fingerprint sensing system according to claim 1, is characterized in that, described first modulation signal at least comprises the first level and second electrical level, and the voltage of described first level is different from the voltage of described second electrical level.
13. capacitive sensing systems according to claim 12, it is characterized in that, described first modulation signal comprises the square-wave signal that the first level and second electrical level alternately occur, wherein, the voltage condition of described first level and second electrical level is any one in following three kinds of situations:
The voltage of the first: the first level is positive voltage, and the voltage of second electrical level is 0;
The voltage of the second: the first level is 0, and the voltage of second electrical level is negative voltage;
The voltage of the three: the first level is positive voltage, and the voltage of second electrical level is negative voltage, and the absolute value of the voltage of described first level is the same or different than the absolute value of the voltage of described second electrical level.
14. capacitive sensing systems according to claim 12, it is characterized in that, described capacitive detection circuit is when the level of described earth terminal is the first level, the first signal is read from described sensor board, and when the level of described earth terminal is second electrical level, read secondary signal from described sensor board, obtained the predetermined information of target object by the first signal of described reading and secondary signal.
15. capacitive sensing systems according to claim 12, it is characterized in that, described first modulation signal comprises three level further, the voltage of described second electrical level is between the voltage and the voltage of three level of the first level, and described first modulation signal comprises the secondary ladder square-wave signal be made up of the first level, second electrical level, three level three.
16. capacitive sensing systems according to claim 15, it is characterized in that, wherein, described capacitive detection circuit is when the level of described earth terminal is the first level, the first signal is read from described sensor board, when the level of described earth terminal is second electrical level, secondary signal is read from described sensor board, when the level of described earth terminal is three level, the 3rd signal is read from described sensor board, and when the level of described earth terminal switches to second electrical level from three level, the 4th signal is read from described sensor board, by the first signal of described reading, secondary signal, the predetermined information of the 3rd signal and the 4th signal acquisition target object.
17. capacitive sensing systems according to claim 1 or 7, it is characterized in that, described capacitive sensing system comprises control circuit further, the earth terminal of described capacitive detection circuit is electrically connected with described control circuit, and described control circuit is for applying the earth terminal of described first modulation signal to described capacitive detection circuit.
18. capacitive sensing systems according to claim 17, it is characterized in that, the power end of described capacitive detection circuit is electrically connected with described control circuit, and described control circuit, for applying described first power supply signal to described earth terminal, applies second source signal to described power end.
19. capacitive sensing systems according to claim 18, it is characterized in that, described control circuit comprises earth terminal, the voltage of the earth terminal of described control circuit be 0 volt or for the electronic equipment at described capacitive sensing system place systematically voltage or be the systematically voltage of an electronic equipment or be constant voltage.
20. capacitive sensing systems according to claim 1, it is characterized in that, described capacitive sensing system comprises guarded electrode further, described guarded electrode is at least arranged at around described sensor board.
21. capacitive sensing systems according to claim 20, is characterized in that, described guarded electrode is any one following situation:
The first, described guarded electrode comprises multiple electrode, is distributed in around described sensor board;
The second, described guarded electrode is the electrode of middle hollow out, and the void region of the corresponding described guarded electrode of described sensor board is arranged;
3rd, described guarded electrode and the stacked setting of described sensor board, and along the direction of stacked vertical, the periphery of described guarded electrode exceeds the periphery of described sensor board.
22. capacitive sensing systems according to claim 20, it is characterized in that, described capacitive sensing system comprises heat sink further, and described heat sink is used for dispelling the heat to described capacitive sensing system, and described heat sink is also for as described guarded electrode.
23. capacitive sensing systems according to claim 22, is characterized in that, described sensor board and the stacked setting of described heat sink, and along the direction of stacked vertical, the periphery of described heat sink exceeds the edge of described sensor board.
24. capacitive sensing systems according to claim 20 or 22, it is characterized in that, described capacitive sensing system comprises multiple lead frame further, and described guarded electrode and described multiple lead frame are positioned at same layer, are manufactured from the same material.
25. capacitive sensing systems according to claim 20, it is characterized in that, described capacitive detection circuit and described sensor board are integrated in a capacitive detection circuit chip, described capacitive sensing system comprises substrate further, described capacitive detection circuit chip is arranged on the substrate, and described guarded electrode is arranged on the substrate.
26. capacitive sensing systems according to claim 25, is characterized in that, described substrate is printed circuit board (PCB) or flexible circuit board.
27. capacitive sensing systems according to claim 20, is characterized in that, described guarded electrode is made up of conductive material, for receiving electric signal.
28. capacitive sensing systems according to claim 20, is characterized in that, described guarded electrode is electrically connected to the earth terminal of described capacitive detection circuit, for receiving described first modulation signal.
29. capacitive sensing systems according to claim 20, it is characterized in that, described sensor board comprises multiple capacitance sensing pole plate, and described capacitive detection circuit, by measuring the electric capacity between multiple capacitance sensing pole plate and described target object, obtains the predetermined information of described target object.
30. capacitive sensing systems according to claim 29, is characterized in that, described multiple capacitance sensing pole plate is arranged in induction arrays, and described guarded electrode is at least arranged on around described induction arrays.
31. capacitive sensing systems according to claim 1, it is characterized in that, described capacitive detection circuit except for when described earth terminal loads described first modulation signal, described first pumping signal be provided drive described sensor board to perform the first detecting pattern except, also be further used for when described earth terminal loads the second modulation signal, provide the second pumping signal to drive described sensor board to perform the second detecting pattern, wherein, first modulation signal is different from the second modulation signal, and the first pumping signal is different from the second pumping signal.
32. capacitive sensing systems according to claim 31, is characterized in that, described second pumping signal changes with the change of described second modulation signal.
33. capacitive sensing systems according to claim 32, is characterized in that, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described second modulation signal.
34. capacitive sensing systems according to claim 32, it is characterized in that, described second modulation signal and described second pumping signal are voltage signal, and the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal.
35. capacitive sensing systems according to claim 34, is characterized in that, the changes in amplitude size of described second pumping signal is corresponding identical with the changes in amplitude size of described second modulation signal.
36. capacitive sensing systems according to claim 32, is characterized in that, described second pumping signal and described second modulation signal are periodically variable signal.
37. capacitive sensing systems according to claim 36, it is characterized in that, described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequency in-phase signal, or be same width with in-phase signal frequently, or for homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal.
38. capacitive sensing systems according to claim 31, is characterized in that, described second modulation signal at least comprises the 4th level and the 5th level, and wherein, the voltage of the 4th level is different from the voltage of the 5th level.
39. capacitive sensing systems according to claim 31, it is characterized in that, first detecting pattern is fingerprint sensing pattern, second detecting pattern is for touching detecting pattern, wherein, when described capacitive sensing system is in touch detecting pattern, described capacitive detection circuit touches detection operation for driving described sensor board to perform, and sensed object object is to the touch of described sensor board; When described capacitive sensing system is in fingerprint detection pattern, described capacitive detection circuit performs fingerprint detection operation, the fingerprint of sensed object object for driving described sensor board.
40., according to the capacitive sensing system in claim 31-39 described in any one, is characterized in that, the first modulation signal and the second modulation signal are periodically variable signal, and wherein, the frequency of the first modulation signal is greater than the frequency of the second modulation signal.
41., according to the capacitive sensing system in claim 31-39 described in any one, is characterized in that, the Voltage Peak peak value of the first modulation signal is greater than the Voltage Peak peak value of the second modulation signal.
42., according to the capacitive sensing system in claim 31-39 described in any one, is characterized in that, the first pumping signal and the second pumping signal are periodically variable signal, and wherein, the frequency of the first pumping signal is greater than the frequency of the second pumping signal.
43., according to the capacitive sensing system in claim 31-39 described in any one, is characterized in that, the Voltage Peak peak value of the first pumping signal is greater than the Voltage Peak peak value of the second pumping signal.
44., according to capacitive sensing system according to claim 39, is characterized in that, whether described capacitive detection circuit is touched according to described sensor board, carry out the described sensor board of corresponding driving and whether perform fingerprint sensing operation;
If described sensor board is touched, described capacitive detection circuit then switch provide the second modulation signal for the first modulation signal to described earth terminal, switch provide the second pumping signal be the first pumping signal to sensor board, in order to perform fingerprint sensing;
If described sensor board is not touched, described capacitive detection circuit provides the second modulation signal to described earth terminal, provides the second pumping signal to described sensor board, in order to perform touch-sensing.
45. capacitive sensing systems according to claim 17, it is characterized in that, described capacitive detection circuit is integrated in a capacitive detection circuit chip, described control circuit is integrated in a control circuit chip, described capacitive detection circuit chip and described control circuit chip or be encapsulated in an integrated antenna package, or be encapsulated in respectively in two integrated antenna packages.
46., according to capacitive sensing system according to claim 37, is characterized in that, described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged at around described sensor board, wherein:
The integrated antenna package including described capacitive detection circuit chip comprises the lead frame be connected with described capacitive detection circuit chip, and described guarded electrode and described lead frame are positioned at same layer, and are manufactured from the same material; Or/and
The integrated antenna package including described capacitive detection circuit chip comprises heat sink, and described heat sink is used for dispelling the heat to described capacitive detection circuit chip, also for as described guarded electrode; Or/and
The integrated antenna package including described capacitive detection circuit chip comprises substrate, and described capacitive detection circuit chip is arranged on the substrate, and described substrate arranges described guarded electrode further.
47. capacitive sensing systems according to claim 1, it is characterized in that, described capacitive detection circuit drives described sensor board to perform sense operation, to obtain the predetermined information of described target object, wherein, described predetermined information comprises biological information and/or the touch operation information of target object.
48. capacitive sensing systems according to claim 47, is characterized in that, described biological information is finger print information.
49. capacitive sensing systems according to claim 47, is characterized in that, described touch operation information for whether have target object close to or touch described sensor board.
50. capacitive sensing systems according to claim 1, is characterized in that, described capacitive sensing system is fingerprint sensing system.
51. capacitive sensing systems according to claim 1, is characterized in that, described capacitive sensing system is the capacitive sensing system saving driving ring.
52. capacitive sensing systems according to claim 1, is characterized in that, described capacitive detection circuit carries out self-capacitance detection to described sensor board, to realize sense operation by providing described first pumping signal.
53. capacitive sensing systems according to claim 1, is characterized in that, described capacitive sensing system is used for the predetermined information that sensed object object is finger.
54. capacitive sensing systems according to claim 2, it is characterized in that, described sensor board comprises multiple capacitance sensing pole plate, described capacitive detection circuit comprises multiple sensing cell and multiple selection unit, each sensing cell is connected with at least one capacitance sensing pole plate by a selection unit, each sensing cell is electrically connected with described earth terminal further, each sensing cell provides the first pumping signal to described capacitance sensing pole plate by described selection unit, and the sensing signal received from described capacitance sensing pole plate, the predetermined information of target object is obtained by described sensing signal.
55. capacitive sensing systems according to claim 54, it is characterized in that, described selection unit conducts for selecting sensing cell and which capacitance sensing pole plate, wherein, by described multiple selection unit, described capacitive detection circuit simultaneously or timesharing export described first pumping signal to described multiple capacitance sensing pole plate.
56. capacitive sensing systems according to claim 54, it is characterized in that, described sensing cell comprises operational amplifier and feedback branch, described operational amplifier comprises in-phase end, end of oppisite phase and output terminal, described end of oppisite phase connects at least one capacitance sensing pole plate by a selection unit, described feedback branch is connected between end of oppisite phase and output terminal, and described operational amplifier connects described earth terminal.
57. capacitive sensing systems according to claim 56, it is characterized in that, the in-phase end of described operational amplifier receives a reference voltage, and described reference voltage raises with the voltage rising of described first modulation signal, declines with the voltage drop of described first modulation signal.
58. capacitive sensing systems according to claim 57, is characterized in that, described end of oppisite phase exports described first pumping signal to described capacitance sensing pole plate.
59. capacitive sensing systems according to claim 58, is characterized in that, are in empty short status during described operational amplifier work.
60. capacitive sensing systems according to claim 58, it is characterized in that, described feedback branch comprises a feedback capacity, described feedback capacity is connected between end of oppisite phase and output terminal, described sensing cell comprises computing unit further, described computing unit is connected with described output terminal, and described computing unit obtains the predetermined information of described target object by the electric charge in described feedback capacity or change in voltage.
61. capacitive sensing systems according to claim 1, it is characterized in that, described sensor board comprises multiple capacitance sensing pole plate, and described capacitive detection circuit, by measuring the electric capacity between multiple capacitance sensing pole plate and described target object, obtains the predetermined information of described target object.
62. 1 kinds of electronic equipments, is characterized in that: described electronic equipment comprises as the capacitive sensing system in claim 1-61 as described in any one claim.
63. electronic equipments according to claim 62, it is characterized in that: described electronic equipment to comprise in display device, control knob, housing any one, two kinds or all, described capacitive sensing system or be arranged in the viewing area of described display device, or under being arranged at described control knob, or be arranged in described housing.
64. 1 kinds of capacitive sensing systems, comprising:
Sensor board, for being coupled to target object to perform sense operation with capacitive coupling;
Capacitive detection circuit, described capacitive detection circuit comprises Signal transmissions end and modulated terminal, described capacitive detection circuit is used for providing the first pumping signal to described sensor board by described Signal transmissions end, sense operation is performed to drive described sensor board, the modulated terminal of described capacitive detection circuit is for loading the first modulation signal, and described first pumping signal changes with the change of described first modulation signal.
65. capacitive sensing systems according to claim 64, is characterized in that, other voltage in described capacitive detection circuit all changes with the change of the voltage of described modulated terminal.
66. capacitive sensing systems according to claim 64, is characterized in that, described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described first modulation signal.
67. capacitive sensing systems according to claim 64, it is characterized in that, described first modulation signal and described first pumping signal are voltage signal, and the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
68. capacitive sensing systems according to claim 67, is characterized in that, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.
69. capacitive sensing systems according to claim 64, is characterized in that, described first pumping signal and described first modulation signal are periodically variable signal.
70. capacitive sensing systems according to claim 69, it is characterized in that, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequency in-phase signal, or be same width with in-phase signal frequently, or for homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal.
71. capacitive sensing systems according to claim 67, it is characterized in that, described capacitive detection circuit comprises power end, earth terminal, described earth terminal is for loading the first power supply signal, described power end is for loading second source signal, and the voltage difference between second source signal and the first power supply signal is the supply voltage of described capacitive detection circuit work.
72., according to the capacitive sensing system described in claim 71, is characterized in that, described modulated terminal is the one in described power end and described both earth terminals, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal raises with the voltage rising of described first power supply signal, reduces with the voltage reduction of described first power supply signal.
73. according to the capacitive sensing system described in claim 71, it is characterized in that, described capacitive detection circuit comprises reference voltage end further, described reference voltage end is for loading the 3rd power supply signal, the voltage of described 3rd power supply signal is between the voltage and the voltage of the first power supply signal of described second source signal, described modulated terminal is the one in described power end, described earth terminal, described reference voltage end three, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal, the 3rd power supply signal all raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal, the 3rd power supply signal all raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal; Or
When described reference voltage end is described modulated terminal, described 3rd power supply signal comprises described first modulation signal, and the voltage of described first power supply signal, second source signal all raises with the rising of the voltage of described 3rd power supply signal, reduces with the reduction of the voltage of described 3rd power supply signal.
74. capacitive sensing systems according to claim 64, is characterized in that: described first modulation signal at least comprises the first level and second electrical level, and the voltage of described first level is different from the voltage of described second electrical level.
75. capacitive sensing systems according to claim 64, is characterized in that: described capacitive sensing system except for when described modulated terminal loads the first modulation signal, the first pumping signal be provided drive described sensor board to perform the first detecting pattern except, also be further used for when described modulated terminal loads the second modulation signal, the second pumping signal is provided to drive described sensor board to perform the second detecting pattern, wherein, first modulation signal is different from the second modulation signal, and the first pumping signal is different from the second pumping signal.
76., according to the capacitive sensing system described in claim 75, is characterized in that, described second pumping signal changes with the change of described second modulation signal.
77., according to the capacitive sensing system described in claim 76, is characterized in that, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described sensor board and described earth terminal with the change of described second modulation signal.
78. according to the capacitive sensing system described in claim 76, it is characterized in that, described second modulation signal and described second pumping signal are voltage signal, and the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal.
79., according to the capacitive sensing system described in claim 78, is characterized in that, the changes in amplitude size of described second pumping signal is corresponding identical with the changes in amplitude size of described second modulation signal.
80., according to the capacitive sensing system described in claim 76, is characterized in that, described second pumping signal and described second modulation signal are periodically variable signal.
81. capacitive sensing systems according to Claim 8 described in 0, it is characterized in that, described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequency in-phase signal, or be same width with in-phase signal frequently, or for homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal.
82. according to the capacitive sensing system described in claim 76, it is characterized in that, in described first detecting pattern and described second detecting pattern, one is fingerprint detection pattern, another kind of for touching detecting pattern, wherein, when described capacitive sensing system is in touch detecting pattern, whether described capacitive detection circuit touches detection operation for driving described sensor board to perform, sense and have target object to touch described sensor board; When described capacitive sensing system is in fingerprint detection pattern, described capacitive detection circuit performs fingerprint detection operation for driving described sensor board, and whether the fingerprint of sensed object object is preset fingerprint.
83., according to the capacitive sensing system described in claim 75, is characterized in that, described second modulation signal comprises the 4th level and the 5th level, and the voltage of described 4th level is different from the voltage of described 5th level.
84. according to the capacitive sensing system in claim 75-83 described in any one claim, it is characterized in that, first modulation signal and the second modulation signal are periodically variable signal, and wherein, the frequency of the first modulation signal is greater than the frequency of the second modulation signal.
85., according to the capacitive sensing system in claim 75-83 described in any one claim, is characterized in that, the Voltage Peak peak value of the first modulation signal is greater than the Voltage Peak peak value of the second modulation signal.
86. according to the capacitive sensing system in claim 75-83 described in any one claim, it is characterized in that, first pumping signal and the second pumping signal are periodically variable signal, and wherein, the frequency of the first pumping signal is greater than the frequency of the second tune pumping signal.
87., according to the capacitive sensing system in claim 75-83 described in any one claim, is characterized in that, the Voltage Peak peak value of the first pumping signal is greater than the Voltage Peak peak value of the second pumping signal.
88., according to the capacitive sensing system described in claim 75, is characterized in that, whether described capacitive detection circuit is touched according to described sensor board, carry out the described sensor board of corresponding driving and whether perform fingerprint sensing operation;
If described sensor board is touched, described capacitive detection circuit then switch provide the second modulation signal for the first modulation signal to described earth terminal, switch provide the second pumping signal be the first pumping signal to sensor board, in order to perform fingerprint sensing;
If described sensor board is not touched, described capacitive detection circuit provides the second modulation signal to described earth terminal, provides the second pumping signal to described sensor board, in order to perform touch-sensing.
89. according to the capacitive sensing system described in claim 72, it is characterized in that, described capacitive sensing system comprises control circuit further, described control circuit is connected respectively with described power end, earth terminal, for providing described second source signal for described power end, for described earth terminal provides the first power supply signal.
90. capacitive sensing systems according to claim 64, is characterized in that, described capacitive detection circuit is used for performing self-capacitance to described sensor board and detects.
91. capacitive sensing systems according to claim 64, is characterized in that, described capacitive sensing system is fingerprint sensing system.
92., according to the capacitive sensing system described in claim 91, is characterized in that, described capacitive sensing system is the fingerprint sensing system saving driving ring.
93. capacitive sensing systems according to claim 64, it is characterized in that, described sensor board comprises multiple capacitance sensing pole plate, described capacitive detection circuit performs sense operation by the capacitance size measured between described multiple capacitance sensing pole plate and target object, obtains the predetermined information of target object.
94., according to the capacitive sensing system described in claim 93, is characterized in that, described predetermined information comprises biological information and/or touch operation information.
95., according to the capacitive sensing system described in claim 94, is characterized in that, described biological information comprises fingerprint, palmmprint.
96., according to the capacitive sensing system described in claim 94, is characterized in that, described touch operation information is whether described sensor board has by operation information that is close or that touch.
97., according to the capacitive sensing system described in claim 93, is characterized in that, described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged at around described sensor board.
98., according to the capacitive sensing system described in claim 97, is characterized in that, it is characterized in that, described guarded electrode is electrically connected to described modulated terminal, and described guarded electrode receives described first modulation signal.
99. according to the capacitive sensing system described in claim 97, it is characterized in that, it is characterized in that, described capacitive sensing system comprises heat sink further, described heat sink is used for dispelling the heat to described capacitive sensing system, and described heat sink is also for as described guarded electrode.
100. one kinds of electronic equipments, is characterized in that: described electronic equipment comprises as the capacitive sensing system in claim 64-99 as described in any one claim.
The detection method of 101. one kinds of capacitive sensing systems, described capacitive sensing system comprises multiple capacitance sensing pole plate and capacitive detection circuit, and described capacitive detection circuit comprises modulated terminal, and described detection method comprises:
There is provided the first pumping signal to described multiple capacitance sensing pole plate, drive described multiple capacitance sensing pole plate to perform sense operation;
There is provided the first modulation signal to described modulated terminal;
Wherein, described first pumping signal changes with the change of described first modulation signal.
102., according to the detection method described in claim 101, is characterized in that, described first pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described multiple capacitance sensing pole plate and described modulated terminal with the change of described first modulation signal.
103., according to the detection method described in claim 101, is characterized in that, other voltage in described capacitive detection circuit all changes with the change of the voltage of described first modulation signal.
104. according to the detection method described in claim 101, it is characterized in that, described first modulation signal and described first pumping signal are voltage signal, and the voltage of described first pumping signal raises with the rising of the voltage of described first modulation signal, reduces with the reduction of the voltage of described first modulation signal.
105., according to the detection method described in claim 104, is characterized in that, the changes in amplitude size of described first pumping signal is corresponding identical with the changes in amplitude size of described first modulation signal.
106., according to the detection method described in claim 101, is characterized in that, described first pumping signal and described first modulation signal are periodically variable signal.
107. according to the detection method described in claim 106, it is characterized in that, described first pumping signal and described first modulation signal or be homogenous frequency signal, or be with frequency in-phase signal, or be same width with in-phase signal frequently, or for homogenous frequency signal and the phase place of described first pumping signal has certain delay relative to the phase place of the first modulation signal.
108., according to the detection method described in claim 101, is characterized in that, described detection method comprises further:
The second pumping signal is provided to perform sense operation to described multiple capacitance sensing pole plate;
There is provided the second modulation signal to described modulated terminal;
Wherein, described second pumping signal changes with the change of described second modulation signal.
109., according to the detection method described in claim 108, is characterized in that, described second pumping signal is different from described first pumping signal, and described second modulation signal is different from described first modulation signal.
110., according to the detection method described in claim 109, is characterized in that, described second pumping signal changes, in order to reduce the charge/discharge electricity amount of stray capacitance between described multiple capacitance sensing pole plate and described modulated terminal with the change of described second modulation signal.
111. according to the detection method described in claim 110, it is characterized in that, described second modulation signal and described second pumping signal are voltage signal, and the voltage of described second pumping signal raises with the rising of the voltage of described second modulation signal, reduces with the reduction of the voltage of described second modulation signal.
112., according to the detection method described in claim 111, is characterized in that, the changes in amplitude size of described second pumping signal is corresponding identical with the changes in amplitude size of described second modulation signal.
113., according to the detection method described in claim 109, is characterized in that, described second pumping signal and described second modulation signal are periodically variable signal.
114. according to the detection method described in claim 113, it is characterized in that, described second pumping signal and described second modulation signal or be homogenous frequency signal, or be with frequency in-phase signal, or be same width with in-phase signal frequently, or for homogenous frequency signal and the phase place of described second pumping signal has certain delay relative to the phase place of the second modulation signal.
115., according to the detection method described in claim 109, is characterized in that, the first modulation signal and the second modulation signal are periodically variable signal, and wherein, the frequency of the first modulation signal is greater than the frequency of the second modulation signal.
116., according to the detection method described in claim 109, is characterized in that, the Voltage Peak peak value of the first modulation signal is greater than the Voltage Peak peak value of the second modulation signal.
117. detection methods according to claim 116 or 117, is characterized in that, provide the first pumping signal to described multiple capacitance sensing pole plate, perform fingerprint sensing operation for driving described multiple capacitance sensing pole plate; Thering is provided the second pumping signal to described multiple capacitance sensing pole plate, performing touch operation for driving described multiple capacitance sensing pole plate.
118., according to the detection method described in claim 117, is characterized in that, described detection method comprises further:
Judge whether described multiple capacitance sensing pole plate is touched, and whether perform fingerprint sensing operation according to the next described multiple capacitance sensing pole plate of corresponding driving of judged result;
If judge, described multiple capacitance sensing pole plate is touched, then switch provide the second modulation signal for the first modulation signal to described earth terminal, switch provide the second pumping signal be the first pumping signal to described multiple capacitance sensing pole plate, perform fingerprint sensing;
If judge, described multiple capacitance sensing pole plate is not touched, then provide the second modulation signal to described earth terminal, provide the second pumping signal to described multiple capacitance sensing pole plate, perform touch-sensing.
119., according to the detection method described in claim 101, is characterized in that, described capacitive sensing system comprises guarded electrode further, and described guarded electrode is at least arranged on the periphery of described multiple capacitance sensing pole plate, and described detection method comprises further:
There is provided described first modulation signal to described guarded electrode.
120., according to the detection method described in claim 101, is characterized in that, described detection method, by measuring the electric capacity between described multiple capacitance sensing pole plate and target object, carrys out the predetermined information of sensed object object.
121., according to the detection method described in claim 120, is characterized in that, described predetermined information comprises biological information and/or the touch operation information of target object.
122., according to the detection method described in claim 121, is characterized in that, described biological information is finger print information.
123., according to the detection method described in claim 121, is characterized in that, described touch operation information for whether have target object close to or touch described multiple capacitance sensing pole plate.
124., according to the detection method described in claim 120, is characterized in that, described detection method, by measuring the self-capacitance between described multiple capacitance sensing pole plate and target object, carrys out the predetermined information of sensed object object.
125., according to the detection method described in claim 101, is characterized in that, described capacitive detection circuit comprises earth terminal and power end, and described detection method comprises further:
There is provided the first power supply signal to described earth terminal;
There is provided second source signal to described power end, the voltage difference of described second source signal and described first power supply signal is the supply voltage of described capacitive detection circuit work.
126., according to the detection method described in claim 125, is characterized in that, described modulated terminal is the one in described power end and described both earth terminals, wherein:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal raises with the voltage rising of described first power supply signal, reduces with the voltage reduction of described first power supply signal.
127., according to the detection method described in claim 125, is characterized in that, described capacitive detection circuit comprises reference voltage end further, and described detection method comprises further:
There is provided the 3rd power supply signal to described reference voltage end, the voltage of described 3rd power supply signal is between the voltage and the voltage of the first power supply signal of described second source signal;
Wherein, described modulated terminal is the one in described power end, described earth terminal, described reference voltage end three:
When described power end is described modulated terminal, described second source signal comprises described first modulation signal, and the voltage of described first power supply signal, the 3rd power supply signal all raises with the rising of the voltage of described second source signal, reduces with the reduction of the voltage of described second source signal; Or
When described earth terminal is described modulated terminal, described first power supply signal comprises described first modulation signal, and the voltage of described second source signal, the 3rd power supply signal all raises with the rising of the voltage of described first power supply signal, reduces with the reduction of the voltage of described first power supply signal; Or
When described reference voltage end is described modulated terminal, described 3rd power supply signal comprises described first modulation signal, and the voltage of described first power supply signal, second source signal all raises with the rising of the voltage of described 3rd power supply signal, reduces with the reduction of the voltage of described 3rd power supply signal.
CN201510015704.0A 2015-01-13 2015-01-13 Electronic equipment, capacitive sensing system and detection method of capacitive sensing system Pending CN104516716A (en)

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CN201510015704.0A CN104516716A (en) 2015-01-13 2015-01-13 Electronic equipment, capacitive sensing system and detection method of capacitive sensing system
PCT/CN2015/099560 WO2016112781A1 (en) 2015-01-13 2015-12-29 Electronic device and capacitive sensing system thereof, and detection method for capacitive sensing system
CN201580002461.5A CN105793869A (en) 2015-01-13 2015-12-29 Electronic equipment, capacitive sensing system and detection method of capacitive sensing system
PCT/CN2016/070738 WO2016112848A1 (en) 2015-01-13 2016-01-12 Electronic device and touch sensing system thereof, and detection method for touch sensing system

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US10318787B2 (en) 2016-09-18 2019-06-11 Boe Technology Group Co., Ltd. Fingerprint photocurrent detection unit, fingerprint identifier, driving method and display device
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US11334652B2 (en) 2017-09-07 2022-05-17 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Fingerprint identification method, device, mobile terminal, and storage medium
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