CN106537414A

CN106537414A - Sensor, sensing device and electronic equipment

Info

Publication number: CN106537414A
Application number: CN201680000688.0A
Authority: CN
Inventors: 李问杰
Original assignee: Shenzhen Sunwave Technology Co Ltd
Current assignee: Shenzhen Sunwave Technology Co Ltd
Priority date: 2016-08-09
Filing date: 2016-08-09
Publication date: 2017-03-22
Also published as: WO2018027596A1

Abstract

The invention provides a sensor, a sensing device and electronic equipment; the sensor comprises a plurality of sensing units and a scan drive circuit; the sensing unit comprises the following parts: a sensing electrode; a first control switch connected with the sensing electrode; a second control switch connected with the sensing electrode; the scan drive circuit is respectively connected with the first and second control switches of each sensing unit, and used for driving the first and second control switches of each sensing unit to conduct by time; for the same sensing unit array: when the sensing electrode of the sensing unit receives an excitation signal through the conducted first control switch, the sensing electrode executes sensing operations, and the sensing electrodes of remaining sensing units receive a first reference signal through the conducted second control switch; the sensing device comprises the sensor; the electronic equipment comprises the sensing device.

Description

Sensor, sensing device and electronic equipment

Technical field

The present invention relates to field of sensing technologies, more particularly to a kind of sensor, sensing device and there is the sensing dress The electronic equipment put.

Background technology

With the development of society, increasing electronic equipment is (such as：Mobile phone, panel computer, Wearable, Yi Jizhi The various intelligent artifacts such as energy household) typically one or more sensing device can be all set.The sensing device includes that sensing such as is used The touch sensing device of family touch operation, bio information sensing device of sensing biological information of human body etc..

By taking bio information sensing device as an example, generally, the bio information sensing device includes multiple in array arrangement Sensing electrode and the drive circuit being connected with each sensing electrode.The drive circuit typically drives sensing electrode to hold line by line Row bio information is sensed.

So, when each drive part sensing electrode of the drive circuit performs bio information to be sensed, remaining sensing electrode On voltage because of situations such as signal interference etc. affect can exist it is inconsistent, therefore to perform bio information sensing sensing electricity The parasitic effects of pole are different and be unknown, and bio information sensing device is of a relatively high to sensing required precision, so as to not Beneficial to the accurate detection of bio information.

The content of the invention

It is contemplated that at least solving one of technical problem present in prior art.For this purpose, the present invention needs offer one Plant sensor, sensing device and electronic equipment.

The present invention provides a kind of sensor, including：

Multiple sensing units, the sensing unit include：

Sensing electrode；

First controlling switch, is connected with the sensing electrode；With

Second controlling switch, is connected with the sensing electrode；With

Scan drive circuit, is connected with the second controlling switch respectively with the first controlling switch in each sensing unit, is used for The first controlling switch in each sensing unit is driven to turn on the second controlling switch timesharing；

For same row sensing unit：When the sensing electrode of a sensing unit is received by the first controlling switch for turning on During pumping signal, correspondence performs sensing operation, and the sensing electrode in remaining sensing unit is connect by the second controlling switch for turning on Receive one first reference signal.

Alternatively, the first controlling switch of the conducting is further used for entering the sensing signal from the sensing electrode Row output.

Alternatively, the sensor is capacitance type sensor.

Alternatively, the capacitance sensor is self-capacitance sensor.

Alternatively, the sensor is fingerprint sensor.

Alternatively, the plurality of sensing unit is arranged in array, when the scan drive circuit drives a line sensing single While the first controlling switch conducting in unit, the second controlling switch are ended, the first control in remaining row sensing unit is driven Switch cut-off, the conducting of the second controlling switch.

Alternatively, the scan drive circuit drives sensing unit to perform sensing operation by row.

Alternatively, the sensor further includes data selection circuit, the data selection circuit and each sensing Unit connects, for selecting to export the pumping signal or one second reference signal to corresponding sensing electrode.

Alternatively, the data selection circuit includes multiple data selectors, and each data selector connection at least two is arranged Sensing unit, the data selector are used for timesharing output drive signal to each row sensing unit being connected, and when by leading When the first logical controlling switch exports the pumping signal to wherein string sensing unit, entered by the first controlling switch for turning on One step exports the sensing unit that second reference signal is connected to remaining several row.

Alternatively, the data selector enters one while output drive signal performs sensing operation to sensing electrode Step is exported to the sensing signal from the sensing electrode.

Alternatively, the sensor further includes multiple scan line groups and multiple data wire groups；Wherein, it is described many Individual scan line group is connected with the scan drive circuit, further connects a line sensing unit per scan line group；It is described Multiple data wire groups are connected with the data selection circuit, and each data wire group further connects string sensing unit；Often Scan line group includes the first scan line and the second scan line, and first scan line connects the first control of a line sensing unit System switch, second scan line are used for second controlling switch of the connection with a line sensing unit；Each data wire group includes First data wire and the second data wire, the first controlling switch of the first data wire connection string sensing unit, described second Data wire connects the second controlling switch of same row sensing unit.

Alternatively, first scan line and the second scan line of the plurality of scan line group extends along line direction, and along row Direction arranges；First data wire and the second data wire of the plurality of data wire group extends along column direction, and arranges along line direction Row.

Alternatively, in the scan drive circuit drives a line sensing unit the first controlling switch conducting, the second control During system switch cut-off, by the first data wire and the first controlling switch of conducting, the plurality of data selector is every time while defeated Go out the pumping signal to a sensing electrode, and second reference signal is exported to remaining sensing electrode.

Alternatively, the sensor further includes the first reference signal line and the second reference signal line, wherein, described One reference signal line is connected with the second data wire in each data wire group, second reference signal line and the plurality of data Selector connects, first reference signal line and second reference signal be respectively used to transmission first reference signal and Second reference signal；For at least two row sensing units being connected with same data selector：When the data are selected When device transmits the pumping signal to the wherein sensing electrode of string sensing unit, described the on the second reference signal line is transmitted Sensing electrode of two reference signals to other row sensing units；For same row sensing unit：When the sense of a wherein sensing unit When survey electrode receives the pumping signal, the sensing electrode of remaining sensing unit is received on first reference signal line First reference signal.

Alternatively, first reference signal is identical with second reference signal.

Alternatively, first reference signal is identical with the pumping signal.

Alternatively, the sensing unit includes one first controlling switch and one second controlling switch, or, the sensing unit Including 2 first controlling switches being connected in parallel and 2 second controlling switches being connected in parallel.

Alternatively, first controlling switch and second controlling switch are thin film transistor switch.

Alternatively, the sensor further includes insulated substrate, the plurality of sensing unit, turntable driving electricity Road, the plurality of scan line group, the plurality of data wire group, first reference signal line, second reference signal Line and the data selection circuit are both formed on the insulated substrate, and the sensing electrode of the plurality of sensing unit is formed in On the insulated substrate, and the sensing electrode of the plurality of sensing unit cover first controlling switch, the second controlling switch, The plurality of scan line group and the plurality of data wire group, the insulated substrate back to the plurality of sensing unit What side was used to receiving target object approaches or touches input.

Alternatively, the insulated substrate is glass substrate, and the transistor switch in the sensor is thin film transistor (TFT) Switch, first controlling switch and second controlling switch are thin film transistor switch.

A kind of sensing device of the present invention, including the sensor described in above-mentioned middle any one.

Alternatively, the sensing device further includes control chip, for controlling the work of the capacitance type sensor Sequential, provides the pumping signal by the first controlling switch for turning on and performs sensing operation to sensing electrode, by conducting Second controlling switch provides first reference signal to sensing electrode, and receives the sensing letter from sensor output Number, to obtain associated sensed information.

It is as the sensing unit of sensor of the invention further includes the first controlling switch and the second controlling switch, described Scan drive circuit is used for the first controlling switch of control and is turned on the second controlling switch timesharing, when in string sensing unit When the sensing electrode of one sensing unit receives pumping signal by the first controlling switch for turning on, correspondence performs sensing operation, Sensing electrode in remaining sensing unit receives one first reference signal by the second controlling switch of conducting, so as to improve Sensing precision.

Accordingly, the sensing device can be turned on by controlling first controlling switch and the second controlling switch timesharing, Come while the first controlling switch by conducting drives sensing electrode to perform sensing operation, further by the second of conducting Controlling switch provides the first reference signal to sensing electrode, so as to be applied with the sensing electrode of first reference signal to holding The parasitic effects of the sensing electrode of row sensing are to understand, correspondingly, the drive circuit is during sensitive information is obtained Knowable parasitic effects can be rejected, so as to improve the precision of sensing operation.

Further, section senses electrode of the sensing device in often row sensing electrode is driven performs sensing operation When, there is provided the second reference signal to all or part of sensing electrode in remaining sensing electrode of same a line, so as to be applied with The sensing electrode of second reference signal is to understand to the parasitic effects in the sensing electrode for performing sensing, correspondingly, institute State drive circuit and knowable parasitic effects can be rejected during sensitive information is obtained, so as to improve the precision of sensing operation.

The present invention further provides a kind of electronic equipment, the electronic equipment includes the electric capacity described in above-mentioned middle any one Formula sensing device.

As the electronic equipment includes the capacitance-type sensing device, therefore, the Consumer's Experience of the electronic equipment compared with It is high.

Description of the drawings

Fig. 1 is the electrical block diagram of one embodiment of bio information sensing device of the present invention.

Top views of the Fig. 2 for the part-structure of bio information sensing device shown in Fig. 1.

Fig. 3 illustrates for the circuit structure of an embodiment of the data selection circuit of bio information sensing device shown in Fig. 1 Figure.

Fig. 4 is the structural representation of another embodiment of bio information sensing device of the present invention.

Cut-away section structural representations of the Fig. 5 for bio information sensing device shown in Fig. 4.

Use state figures of the Fig. 6 for bio information sensing device shown in Fig. 4.

Manufacture method flow charts of the Fig. 7 for an embodiment of biometric information sensor shown in Fig. 3.

Fig. 8 is the method flow diagram for making the first controlling switch and the second controlling switch.

Part-structure schematic diagrams of the Fig. 9 for the another embodiment of this utility model bio information sensing device.

Top views of the Figure 10 for another embodiment of the sensing unit of this utility model bio information sensing device.

Part-structure schematic diagrams of the Figure 11 for the another embodiment of this utility model bio information sensing device.

Structural representations of the Figure 12 for an embodiment of this utility model electronic equipment.

Circuit structure block diagrams of the Figure 13 for an embodiment of electronic equipment shown in Figure 12.

Specific embodiment

It is understandable to enable the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention Specific embodiment be described in detail.However, example embodiment can be implemented in a variety of forms, and it is understood not to limit In embodiment set forth herein；Conversely, thesing embodiments are provided so that the present invention fully and completely, and example will be implemented The design of mode comprehensively conveys to those skilled in the art.It is for convenience or clear, may exaggerate, omit or schematically show The thickness and size that go out shown in the accompanying drawings per layer and the quantity for schematically illustrating related elements.In addition, the size of element Not exclusively reflection actual size, and the quantity of related elements not exclusively reflects actual quantity.Because accompanying drawing is of different sizes to wait former Cause, in different drawings the quantity of shown same or similar or related elements there is not consistent situation.The phase in figure Same reference represents same or similar structure.So, it should be noted that in order that label has regular and patrols Property etc. is collected, in some different embodiments, same or similar element or structure employ different references, according to technology Relatedness and related text explanation, those skilled in the art is directly or indirectly can to judge to learn.

Additionally, described feature, structure can in any suitable manner with reference in one or more embodiments. In the following description, there is provided many details are fully understood to embodiments of the present invention so as to be given.However, ability Field technique personnel will be appreciated that does not have one or more in the specific detail, or using other structures, constituent element etc., Technical scheme can also be put into practice.In other cases, known features or operation are not shown in detail or describe to keep away Exempt from the fuzzy present invention.

Further, following term is exemplary, it is not intended that limited by any way.Read the application it Afterwards, it would be recognized by those skilled in the art that the statement of these terms is suitable for technology, method, physical component and system (no matter mesh It is front whether to know), it is inferred to or educible its extension including those skilled in the art after reading the application.

In describing the invention, it is to be understood that：" multiple " include two and two or more, and " a plurality of " includes two With more than two, except non-invention separately has clearly specific restriction." at least two row " including two row, three row, four row, five row etc. by Cumulative many various suitable situations.In addition, the word such as " first ", " second " for occurring in each element title and signal name is simultaneously Be not to limit the sequencing that element or signal occur, but name for convenience of element and signal, clearly distinguish each element with And each signal so that description is more succinct.

Need further exist for illustrate be：The sensing device that the present invention is provided is applied to bio information sensing device, especially Stricture of vagina sensing device.So, the present invention is not limited to this, the sensing device of the sensing device also applicable other suitable types, such as Touch sensing device etc..The bio information sensing device is used for the predetermined bio information for sensing target object.The object The body such as finger for user, the alternatively other parts of user's body, such as palm, toe, ear etc., or even it is alternatively other conjunctions The object of suitable type, and it is not limited to human body.The predetermined bio information is such as fingerprint, palmmprint, ear stricture of vagina etc..In addition, described Sensing device mainly adopts capacitive sensing device, so, the invention is not limited in this, and the sensing device is alternatively adopted The sensing device of other suitable types, such as optical profile type sensing device etc..

Below, so that sensing device is as biological information sensor and the bio information sensing device adopts capacitive As a example by sensing device, various embodiments of the present invention are illustrated.

See also Fig. 1 and circuit structure that Fig. 2, Fig. 1 are one embodiment of bio information sensing device of the present invention shows It is intended to.Top views of the Fig. 2 for the part-structure of bio information sensing device shown in Fig. 1.The bio information sensing device 1 includes Multiple sensing electrodes 111 and drive circuit 20.The drive circuit 20 is connected with the plurality of sensing electrode 111, for driving Dynamic the plurality of sensing electrode 111 performs bio information sensing.

Generally, capacitive sensing device includes the sensing device of mutual capacitance type and the sensing device of self-capacitance.

Different from the matching relationship of sensing electrode 111 according to drive circuit 20, bio information sensing device 1 can be from electricity The bio information sensing device of the bio information sensing device or mutual capacitance type of appearance formula.

In the bio information sensing device based on mutual capacitance type, the bio information sensing device of the mutual capacitance type can be wrapped Include multiple drive electrodes and multiple sensing electrodes.Mutual capacitance is formed between each drive electrode and a sensing electrode.In sensing, Drive circuit provides pumping signal to drive electrode, and receives the sensing signal from sensing electrode output.When target object connects During the near or touch bio information sensing device, the quantity of electric charge meeting of the mutual capacitance being formed between drive electrode and sensing electrode There is corresponding change, so as to sensing electrode can export corresponding sensing signal to drive circuit, and then obtain associated biomolecule letter Breath.

In the bio information sensing device based on self-capacitance, the bio information sensing device of the self-capacitance includes Multiple sensing electrodes.Each sensing electrode can form electric capacity over the ground.In sensing, drive circuit provides pumping signal to sensing Electrode, and receive the sensing signal from sensing electrode output.When target object approaches or touches the bio information sensing dress When putting, electric capacity between target object and sensing electrode, is formed, cause the change of the quantity of electric charge in sensing electrode, so as to sensing electricity Pole exports corresponding sensing signal to drive circuit, and then obtains relevant biological information.

In the present embodiment, the bio information sensing device 1 is, for example, the sensing device of self-capacitance.

The plurality of sensing electrode 111 is arranged in multiple lines and multiple rows mode.So, ground, in other embodiments, institute are changed It can be also in that Else Rule or non-regular are arranged to state multiple sensing electrodes 111.

For the sensing electrode 111 of same row：Hold to a sensing electrode 111 when the drive circuit 20 provides pumping signal When row bio information is sensed, there is provided one first reference signal is to the part or all of sensing electrode in remaining sensing electrode 111 111.It is preferred that the drive circuit 20 provides first reference signal gives remaining whole sensing electrode 111.

As the drive circuit 20 is providing the pumping signal to the sensing electrode in each row sensing electrode 111 When 111, there is provided first reference signal to remainder or whole sensing electrode 111, so as to be applied with first reference 111 pairs of parasitic effects in the sensing electrode 111 for performing bio information sensing of sensing electrode of signal are knowable, so as to institute State drive circuit 20 and knowable parasitic effects can be offset when subsequently to the calculating of bio information, and then improve the sense of bio information Survey precision.

First reference signal is, for example, constant voltage signal.

Or, the pressure reduction between first reference signal and the pumping signal keeps constant, for example, first ginseng Examine that signal is identical with the pumping signal, so as to reducing remaining sensing electrode 111 and performing the sensing electricity of bio information sensing The charge/discharge electricity amount of the parasitic capacitance between pole 111, further improves the sensing precision of bio information.

In the present embodiment, the drive circuit 20 drives sensing electrode 111 to perform bio information sensing line by line.So, Ground is changed, in other embodiments, the drive circuit 20 also once can drive multirow sensing electrode 111 to perform life simultaneously Thing information is sensed.

Further, in the present embodiment, for the sensing electrode 111 of same a line：The drive circuit 20 is carried simultaneously Bio information sensing is performed to section senses electrode 111 for the pumping signal, and one second reference signal is provided and felt to remaining The part or all of sensing electrode 111 surveyed in electrode 111.It is preferred that provide second reference signal all sensing to remaining Electrode 111.

For the sensing electrode 111 of same a line：The drive circuit 20 is by successively repeatedly providing the excitation letter simultaneously Number to section senses electrode 111 perform bio information sensing, so as to driven a line sensing electrode 111 perform bio information sense Survey.

When the plurality of sensing electrode 111 is formed on a chip, driven using the timesharing to a line sensing electrode 111 Mode, so as to the pin number on the chip can be reduced, in this regard, having related narration below.

So, ground is changed, in other embodiments, the drive circuit 20 also can drive the sensing electrode of a line simultaneously 111 are performed both by bio information sensing.For example, the plurality of sensing electrode 111 is formed in display screen.When the plurality of sensing When electrode 111 is arranged on chip, the drive circuit is also can be while drive the sensing electrode 111 of a line to be performed both by biological letter Breath sensing.

Further, since the drive circuit 20 is providing the pumping signal to the part sense in each row sensing electrode 111 When surveying electrode 111, there is provided the part or all of sensing electrode 111 that second reference signal is given in remaining sensing electrode 111, from And, it is applied with 111 pairs of parasitisms in the sensing electrode 111 for performing bio information sensing of sensing electrode of second reference signal Impact be it is knowable, so as to, the drive circuit 20 can offset knowable parasitic effects when subsequently to the calculating of bio information, And then improve the sensing precision of bio information.

Second reference signal is, for example, constant voltage signal.

Or, the pressure reduction between second reference signal and the pumping signal keeps constant, for example, second ginseng Examine that signal is identical with the pumping signal, so as to reducing remaining sensing electrode 111 and performing the sensing electricity of bio information sensing The charge/discharge electricity amount of the parasitic capacitance between pole 111, further improves the sensing precision of bio information.

In some embodiments, the bio information sensing device 1 includes multiple sensing units 11.Each sensing Unit 11 includes sensing electrode 111 described in, the first controlling switch 113, and the second controlling switch 115.First control is opened Close 113, second controlling switch 115 to be connected with the sensing electrode 111.

The drive circuit 20 includes scan drive circuit 21, sensing drive circuit 22, and reference signal generation circuit 23. 115 points of the first controlling switch 113 and the second controlling switch in the scan drive circuit 21 and the plurality of sensing unit 11 Do not connect, for driving the first controlling switch 113 and 115 timesharing of the second controlling switch conducting in each sensing unit 11.Institute State sensing drive circuit 22 to be connected with sensing electrode 111 by the first controlling switch 113 in each sensing unit 11, for passing through First controlling switch 113 of conducting provides the pumping signal and performs bio information sensing to sensing electrode 111.The reference letter Number produce circuit 23 be connected with the sensing electrode 111 by the second controlling switch 115 in each sensing unit 11, for passing through Second controlling switch 115 of conducting provides first reference signal to sensing electrode 111.

For the sensing electrode 111 of same row：In the scan drive circuit 21 drives a sensing unit 11 first When controlling switch 113 is turned on, the second controlling switch 115 is ended, the part or all of sensing list in remaining sensing unit 11 is driven First controlling switch 113 of unit 11 is ended, the second controlling switch 115 is turned on, and the reference signal generation circuit 23 is by conducting The second controlling switch 115 provide first reference signal to sensing electrode 111.

The sensing drive circuit 22 provides the pumping signal to sensing electrode by the first controlling switch 113 of conducting 111 perform bio information sensing, and receive the sensing signal from the output of sensing electrode 111, to obtain bio information.

Further, drive the first controlling switch 113 of a line sensing unit 11 to turn on when the scan drive circuit 21, When second controlling switch 115 is ended, the sensing drive circuit 22 provides described simultaneously by the first controlling switch 113 of conducting Pumping signal performs bio information sensing, the reference signal generation circuit 23 by conducting the to section senses electrode 111 One controlling switch 113 provides sense of second reference signal to the part or all of sensing unit 11 in remaining sensing unit 11 Survey electrode 111.

In the present embodiment, the drive circuit 20 can further include data selection circuit 24, and the data are selected Circuit 24 is connected respectively with the sensing drive circuit 22 and the reference signal generation circuit 23.The data selection circuit 24 Further it is connected with the first controlling switch 113 in each sensing unit 11.For each sensing unit 11, selected by the data Circuit 24 is selecting to export the second reference signal or export the sensing provided by the reference signal generation circuit 23 The pumping signal provided by drive circuit 22 is to sensing electrode 111.When the data selection circuit 24 exports the pumping signal During to a sensing electrode 111, sensing signal that the sensing electrode 111 sensed further is exported to the drive circuit 20.

As the drive circuit 20 is provided with the data selection circuit 24, such that it is able to realize the sensing electricity to each row Pole 111 carries out timesharing and performs bio information sensing.

In one embodiment, the data selection circuit 24 includes multiple data selectors (Multiplexer) 241. 241 coupling part sensing unit 11 of each data selector, and further with the reference signal generation circuit 23 and the sense Survey drive circuit 22 to connect respectively.The plurality of data selector 241 is used to select the output pumping signal or described second Reference signal is to sensing electrode 111.Alternatively, each data selector 241 connects at least two row sensing units 11.

The drive circuit 20 once exports the pumping signal to a sensing by each data selector 241 simultaneously respectively Electrode 111 performs bio information sensing, and exports second reference signal respectively to same a line by each data selector 241 Remaining sensing electrode 111 in part or all of sensing electrode 111.

The drive circuit 20 is opened by the first control for successively repeatedly passing through each data selector 241 and conducting simultaneously Close 113 and the pumping signal is exported to sensing electrode 111, driven a line sensing electrode 111 to perform bio information sensing.

Ground is changed, in other embodiments, the data selection circuit 24 is alternatively other suitable circuit knots Structure, it is not limited to multiple data selectors 241 described herein.In addition, when the drive circuit 20 provides described sharp simultaneously When encouraging signal to often capable sensing electrode 111, the data selection circuit 24 may also be omission.

The drive circuit 20 can further include control unit 30.Described control unit 30 and the scan drive circuit 21 and the plurality of data selector 241 connect respectively, drive each row sensing unit for controlling the scan drive circuit 21 The conducting sequential of the first controlling switch 113 and the second controlling switch 115 in 11, and selected by controlling the plurality of data Device 241 carrys out the sequential of pumping signal described in controlled output and second reference signal to sensing electrode 111.

For example, described control unit 30 controls the scan drive circuit 21 and turns on the first controlling switch 113 line by line, and When controlling the conducting of the first controlling switch 113 of each row sensing unit 11, the sensing of the part row or whole rows in remaining row is controlled Second controlling switch 115 of unit 11 is turned on.For same sensing unit 11：Described control unit 30 controls the turntable driving 21 timesharing of circuit turns on the first controlling switch 113 and the second controlling switch 115.

Described control unit 30 controls 241 timesharing of the data selector output pumping signal and gives the data choosing Select each sensing unit 11 that device 241 is connected.

In some embodiments, the bio information sensing device 1 for example further include multiple scan line group B and Multiple data wire group D.Connect a line sensing unit 11, each data wire group D connections string sensing per scan line group B Unit 11.

Specifically, the first scan line B1 and the second scan line B2 are included per scan line group B.Each data wire group D Including the first data wire D1 and the second data wire D2.

First controlling switch 113 includes coordination electrode G1, the first transmission electrode S11 and the second transmission electrode S12. Second controlling switch 115 includes coordination electrode G2, the first transmission electrode S21 and the second transmission electrode S22.Described first Scan line B1 connects coordination electrode G1 of the scan drive circuit 21 and first controlling switch 113.Second scanning Line B2 connects coordination electrode G2 of the scan drive circuit 21 and second controlling switch 115.The first data wire D1 Connect the first transmission electrode S11 of the data selector 241 and the first controlling switch 113.The second data wire D2 connections First transmission electrode S21 of the reference signal generation circuit 23 and the second controlling switch 115.First controlling switch 113 The second transmission electrode S12 connect the sensing electrode 111.The second transmission electrode S22 connections of second controlling switch 115 The sensing electrode 111.

The first data wire D1 is used to transmit the pumping signal and second reference signal, second data wire D2 is used to transmit first reference signal, and the scan drive circuit 21 is by first scan line B1, the second scan line B2 provides scanning open signal to the first controlling switch 113 and the second controlling switch 115, controls 113 He of the first controlling switch Second controlling switch 115 is turned on, and provides scanning pick-off signal to the first control by first scan line B1, the second scan line B2 System switch 113 and the second controlling switch 115, control the first controlling switch 113 and the cut-off of 115 passes is opened in the second control.

First scan line B1 and the second scan line B2 extend along line direction, arrange along column direction.First number Extend along column direction according to line D1 and the second data wire D2, arrange along line direction.

In some embodiments, the bio information sensing device 1 for example further include the first reference signal line R1, Second reference signal line R2 and sensing signal line L.The first reference signal line R1 connects the reference signal generation circuit 23 With the second data wire D2, for transmitting first reference signal.The second reference signal line R2 connects the reference signal Circuit 23 and the plurality of data selector 241 are produced, for transmitting second reference signal.Sensing signal line L connects The sensing drive circuit 22 and the plurality of data selector 241 are connect, for the pumping signal being transmitted to sensing electrode 111 And transmission gives sensing drive circuit 22 from the sensing signal of sensing electrode 11.

The first reference signal line R1, the second reference signal line R2 and sensing signal line L mainly extend along line direction.

Fig. 3 is referred to, Fig. 3 is that the circuit structure of an embodiment of the data selector 241 shown in Fig. 1 of the present invention is illustrated Figure.The data selector 241 includes 8 switch elements 243, each switch element 243 include a first choice switch S1 and One second selecting switch S2.The first choice switch S1 includes coordination electrode G3, the transmission of the first transmission electrode S31 and second Electrode S32.Second selecting switch S2 includes coordination electrode G4, the first transmission electrode S41 and the second transmission electrode S42.Institute State control unit 30 to be connected with coordination electrode G3 and coordination electrode G4 in each switch element 243 respectively.First transmission Electrode S31 is connected with the sensing drive circuit 22.The first transmission electrode S41 is connected with the reference signal generation circuit 23 Connect.The second transmission electrode S32 and the second transmission electrode S42 in each switch element 243 is connected, and is connected to the first control First transmission electrode S11 of system switch 113.

For same switch element 243：Described control unit 30 controls the first choice switch S1 and second and selects to open Close S2 timesharing conducting, i.e. when first choice switch S1 is turned on, the second selecting switch S2 cut-off, when the second selecting switch S2 is led When logical, first choice switch S1 cut-offs.For same data selector 241：When described control unit 30 controls a switch element When first choice switch S1 conductings in 243, the second selecting switch S2 are ended, the first choosing in rest switch unit 243 is controlled Select switch S1 cut-offs, the conducting of the second selecting switch S2.S1 is switched by the first choice for turning on, the sensing drive circuit 22 is carried The sensing electrode 111 of the sensing unit 11 turned on for the pumping signal to the first controlling switch 113；By the second choosing for turning on Switch S2 is selected, the reference signal generation circuit 23 provides the biography that second reference signal is turned on to the second controlling switch 115 The sensing electrode 111 of sense unit 11.

In the present embodiment, the quantity of the plurality of data selector 241 is, for example, 16, each data selector 241 include 8 switch elements 243.Accordingly, with a line sensing electrode 111 quantity be 128.

It should be noted that in FIG, the size of accompanying drawing is limited to, Fig. 1 only illustrates that each data selector 241 is distinguished It is connected with two row sensing units 11, if corresponding with the structure of the data selector 241 shown in Fig. 3, Fig. 1 is actually eliminated often The structure that one data selector 241 is also connected with other six row sensing unit 11.In addition, the structure of Fig. 4 described later and Fig. 1 institutes The structure shown is corresponding, equally eliminates the structure that each data selector 241 is also connected with other six row sensing unit 11, Explain in this together.

Correspondingly, for example by 16 data selectors 241, output 16 is sharp simultaneously every time for the drive circuit 20 16 sensing electrodes 111 of the signal correspondence to same a line are encouraged, and while 112 the second reference signal correspondences of output are to same a line 112 sensing electrodes 111.

So that the bio information sensing device 1 is fingerprint sensing device as an example, when the finger of user approach or touch it is described During the sensing electrode 111 of multiple sensing units 11, due to ridge, paddy it is different from the distance of sensing electrode 111, therefore, ridge, paddy and sense The electric capacity correspondence difference that electrode 111 is formed respectively is surveyed, so as to the impact to the quantity of electric charge in sensing electrode 111 is just different, from And drive circuit 20 can know corresponding finger print information according to the sensing signal of the output of sensing electrode 111.

The operation principle of 1 one embodiment of bio information sensing device is as follows.

Described control unit 30 controls the first choice switch S1 in the switch element 243 in each data selector 241 Conducting, the cut-off of the second selecting switch S2, the first choice controlled in the rest switch unit 243 in each data selector 241 are opened S1 cut-offs are closed, the second selecting switch S2 is turned on, correspondingly, the sensing drive circuit 22 is by leading in each data selector 241 Logical first choice switch S1 provides the pumping signal to the first data wire D1, and the reference signal generation circuit 23 passes through The second selecting switch S2 turned in each data selector 241 is provided in second reference signal to the first data wire D1.It is logical Many secondary controls of described control unit 30 are crossed, the first choice in each switch element 243 in each data selector 241 is opened Close S1 timesharing conducting.

Described control unit 30 control the scan drive circuit 21 drive the first controlling switch 113 to turn on line by line, second Controlling switch 115 is ended, and turn in the first controlling switch 113 for controlling each row respectively, the cut-off of the second controlling switch 115 it is same When, control remaining row the first controlling switch 113 end, the second controlling switch 115 is turned on, correspondingly, first data wire Pumping signal on D1 is exported to sensing electrode 111 by the first controlling switch 113 of conducting, and is received from sensing electrode The sensing signal of 111 outputs, to perform bio information sensing, the second reference signal on the first data wire D1 is by conducting The first controlling switch 113 export to sensing electrode 111, in addition, the reference signal generation circuit 23 by conducting second Controlling switch 115 provides first reference signal to sensing electrode 111.

By when each drive part sensing electrode 111 performs bio information and senses, there is provided the first reference signal and the Two reference signals give remaining corresponding sensing electrode 111, improve the sensing of the bio information of the bio information sensing device further 1 Precision.

Fig. 1, Fig. 4 to Fig. 6 are seen also, Fig. 4 is the knot of another embodiment of bio information sensing device of the present invention Structure schematic diagram.Cut-away section structural representations of the Fig. 5 for bio information sensing device shown in Fig. 4.Fig. 6 is biological letter described in Fig. 4 The use state figure of breath sensing device.The bio information sensing device 1 includes biometric information sensor 2.The bio information Sensor 2 includes insulated substrate 2a, the plurality of sensing unit 11, the plurality of scan line group B, the plurality of data line-group Group D and the first reference signal line R1.The plurality of sensing unit 11, the plurality of scan line group B, the plurality of number It is formed on the insulated substrate 2a according to line-group group D and the first reference signal line R1.

In the present embodiment, the first controlling switch 113 and the second controlling switch 115 in each sensing unit 11 Thin film transistor (TFT) (Thin Film Transistor, TFT) switch is such as, the insulated substrate 2a is, for example, glass substrate, So as to the biometric information sensor 2 being made using the technique of formation TFT switch on glass substrate, and then reducing biological letter Breath sensor 2 and the manufacturing cost including the biometric information sensor 2.When first controlling switch 113, second Controlling switch 115 be thin film transistor switch when, coordination electrode G1, G2 be grid, described first transmission electrode S11, S21 For source electrode, described second transmission electrode S12, S22 are drain electrode.

So, it is glass substrate that the present invention is not intended to limit the insulated substrate 2a, is alternatively the insulation base of other suitable types Plate, equally, does not limit first controlling switch 113 yet and second controlling switch 115 is thin film transistor switch, It can be the switch of other suitable types.

The thin film transistor switch is, for example, low temperature polycrystalline silicon (LTPS) thin film transistor switch, indium gallium zinc (IGZO) thin film transistor switch of the suitable type such as thin film transistor switch, amorphous silicon film transistor switch.It is preferred that institute State thin film transistor switch and switch for low-temperature polysilicon film transistor.

The second surface A2 that the insulated substrate 2a is included first surface A1 and is oppositely arranged with first surface A1, described One surface A 1 is used to receive the touch of target object or is close to input, the plurality of sensing unit 11, the plurality of scanning line-group Group B, the plurality of data wire group D and the first reference signal line R1 are arranged on the second surface A2.

The sensing electrode 111 of the plurality of sensing unit 11 is compared to first controlling switch 113, second control 113, the plurality of scan line group B and the plurality of data line-group D groups are switched closer to the second surface A2.

First controlling switch 113, second controlling switch 115, the plurality of scan line group B and described many Individual data line-group group D is located at the side of the sensing electrode 111 of the plurality of sensing unit 11 back to the insulated substrate 2a.

It is preferred that the sensing electrode 111 of the plurality of sensing unit 11 cover first controlling switch 113, described Two controlling switches 115, the plurality of scan line group B and the plurality of data wire group D.

The biometric information sensor 1 further includes passivation layer 16, and the passivation layer 16 is arranged on the plurality of sensing On unit 11, the plurality of scan line group B, the plurality of data wire group D and the first reference signal line R1.

The passivation layer 16 is used for the surface for planarizing the biometric information sensor 2, and single to the plurality of sensing First 11 grade elements are protected.

See also the manufacture method flow chart of Fig. 5 and Fig. 7, Fig. 7 for an embodiment of biometric information sensor 2. The manufacture method of the biometric information sensor 2 is as follows.

F1：One insulated substrate 2a is provided；

The insulated substrate 2a is, for example, glass substrate.

F2：The plurality of sensing electrode 111 is formed on the insulated substrate 2a；

The sensing electrode 111 is for example made up of metal material.So, ground is changed, the sensing electrode 111 is alternatively to be had Other suitable conductive materials are made, and for example, the sensing electrode 111 also can be made up of transparent conductive material, described transparent Conductive material is, for example, tin indium oxide, indium zinc oxide etc..In addition, the sensing electrode also can be by alloy material systems such as molybdenum lithium molybdenums Into.

F3：The first insulating barrier 12 is formed in the plurality of sensing electrode 111；

First insulating barrier 12 is, for example, that the materials such as silicon oxide, silicon nitride are made.

F4：The first controlling switch 113 and the second controlling switch 115 are formed on first insulating barrier 12, and in described Formed on first insulating barrier 12 and be through to the through hole H of sensing electrode 111, by the through hole H, the first controlling switch 113 and the Two controlling switches 115 are connected with sensing electrode 111；

First controlling switch 113 and the second controlling switch 115 of each sensing unit 11 is formed in sensing electrode 111 Side, and be connected with sensing electrode 111 by through hole H respectively.

F5：Passivation layer 16 is formed in first controlling switch 113 and second controlling switch 115.

The biometric information sensor 2 makes and finishes.It should be noted that in above-mentioned manufacture method, omitting and being formed The step of the plurality of scan line group B, multiple data wire group D and the first reference signal line R1.

As the processing technology of the biometric information sensor 2 formed according to above-mentioned manufacture method is simple, additionally need not set again Put a cover sheet or form coat (Coating layers), so as to manufacturing cost can be saved.

So, ground is changed, in other embodiments, the manufacture method of the biometric information sensor 2 is alternatively：Institute The first controlling switch 113 and the second controlling switch 115 that each sensing unit 11 is formed on insulated substrate 2a is stated, is opened in the first control Close 113 and second and the first insulating barrier 12 is formed in controlling switch 115, and formed on first insulating barrier 12 and be through to first The through hole H of the second transmission electrode S22 of the second transmission electrode of controlling switch 113 and the second controlling switch 115, then described First controlling switch 113 and second controlling switch 115 for connecting each sensing unit 11 is formed on first insulating barrier 12 On sensing electrode 111, next, in sensing electrode 111 arrange cover sheet or formed coat (Coating layers). Thus, also possible.It should be noted that also omit to the plurality of scan line group B, multiple data wire groups herein The description of the step of D and the first reference signal line R1.

Continue with refering to Fig. 5, and see also Fig. 8, Fig. 8 is opened with the second control to make the first controlling switch 113 Close 115 method flow diagram.It is so that the first controlling switch 113 and the second controlling switch 115 are as amorphous silicon film transistor as an example, right The manufacture method that the first controlling switch 113 and the second controlling switch 115 are formed during biometric information sensor 2 is made is entered Row is described as follows.

F41：Coordination electrode G1 and the second controlling switch of the first controlling switch 113 are formed on first insulating barrier 12 115 coordination electrode G2；

F42：The second insulating barrier 13 is formed in first insulating barrier 12, coordination electrode G1, G2；

Second insulating barrier 13 is, for example, that the materials such as silicon oxide, silicon nitride are made.

F43：Active layer 14,15 is formed on second insulating barrier 13；

The active layer 14,15 is amorphous silicon layer.

F44：Formed on second insulating barrier 13 and first insulating barrier 12 and be through to the sensing electrode 111 Through hole H；

It should be noted that step F4 and step F5 can be incorporated in same step realize, so, it is alternatively different at two Formed in step.

F45：The first transmission electrode S11 and second that the first controlling switch 113 is formed on second insulating barrier 13 is passed Transmission pole S12, the first transmission electrode S21 and the second transmission electrode S22 that form the second controlling switch 115, and second biography Transmission pole S12 and the second transmission electrode S22 are full of the through hole H, are connected with connecting the sensing electrode 111 respectively.

The first transmission electrode S11 and the second transmission electrode S12 is located at the both sides of the active layer 14, and described first passes Transmission pole S21 and the second transmission electrode S22 are located at the both sides of the active layer 15, so as to form first controlling switch 113 With second controlling switch 115.

In the present embodiment, the second transmission electrode S12 and second controlling switch of first controlling switch 113 115 the second transmission electrode S22 is connected with the sensing electrode 111 by a through hole H respectively.So, in other embodiments, The second transmission electrode S12's and second controlling switch 115 of first controlling switch 113 in same sensing unit 11 Second transmission electrode S22 can be connected with the sensing electrode 111 by same through hole H.

In step F5：In second insulating barrier 13, the first transmission electrode S11, active layer 14, the second transmission electrode S12, The passivation layer 16 is formed on first transmission electrode S21, active layer 15, the second transmission electrode S22.

The first controlling switch 113 formed in above-mentioned manufacture method and the second controlling switch 115 mainly bottom gate type (Bottom-Gate) thin film transistor (TFT), so, first controlling switch 113 and the second controlling switch 115 are alternatively top gate type (Top-Gate) thin film transistor (TFT), such as low-temperature polysilicon film transistor.

Need it is further noted that the plurality of scan line group B, multiple data wire group D, the first reference signal line R1, first controlling switch 113, second controlling switch 115 connection cabling it is last for example by the modes such as via with Around being formed on the second surface A2 of the insulated substrate 2a connect up (sign) be connected, with aforesaid drive circuit 20 Or corresponding circuit carries out signal transmission in control chip 3 described later.

Alternatively, the biometric information sensor 2 further includes the scan drive circuit 21, the choosing of the plurality of data Select device 241, the second reference signal line R2 and sensing signal line L.The scan drive circuit 21, the plurality of number According to selector 241, the second reference signal line R2 and the sensing signal line L-shaped into the second of the insulated substrate 2a In surface A 2.

The scan drive circuit 21, the plurality of data selector 241, the second reference signal line R2 and described Sensing signal line L is arranged on around the plurality of sensing unit 11.

The first choice switch S1 of the data selector 241 and the second selecting switch S2 are for example also thin film transistor (TFT) Switch.The scan drive circuit 21 generally comprises multiple controlling switch (not shown), and the plurality of controlling switch is, for example, Thin film transistor switch.Correspondingly, the plurality of data selector 241 and the scan drive circuit 21 are in the described first control When switch 113 and second controlling switch 115 are formed, formed by same or analogous processing technology in the lump, so as to improve The integrated level of biometric information sensor 2, and reduce cost of manufacture.

In some embodiments, the bio information sensing device 1 includes control chip 3, and the control chip 3 includes Described control unit 30, the reference signal generation circuit 23, and it is described sensing drive circuit 22.That is, aforesaid drive circuit A part of circuit in 20 is formed in control chip 3, and a part is formed on biometric information sensor 2, is arranged such, a side The integrated level of bio information sensing device 1 is improved in face, reduces the volume of the bio information sensing device 1, in addition, can also reduce The manufacturing cost of bio information sensing device 1.

Alternatively, the biometric information sensor 2 and the control chip 3 are for example respectively nude film (Die), the control Chip 3 is for example arranged on the insulated substrate 2a by flip technique (Flip-Chip).When the insulated substrate 2a is, for example, During glass substrate, the control chip 3 is for example bound by the mode of glass top chip (Chip On Glass, COG) (Bonding) on the glass substrate.When the insulated substrate 2a is, for example, film substrate, the control chip 3 is for example It is bundled on the film substrate by the mode of chip-on-film (Chip On Film, COF).So, the control chip 3 Can be formed on the insulated substrate 2a using other suitable techniques, be not limited to flip technique described herein.

After the control chip 3 is arranged on the insulated substrate 2a of the biometric information sensor, then by the control Coremaking piece 3 is placed in a mold with the biometric information sensor 1, and by being molded (Molding) technique formation packaging body, (figure is not Show) on the biometric information sensor 2 and the control chip 3, so as to be formed as a chip (Chip).The encapsulation style Such as it is made up of epoxide resin material, but is not limited to the epoxide resin material, is alternatively other suitable materials.

After the bio information sensing device 1 is formed, the first surface A1 of the insulated substrate 2a is used to receive target Object approaches or touches input, in other words, when user senses bio information using the bio information sensing device 1, institute First surface A1 is stated compared to the second surface A2 more adjacent objects objects.

In other embodiments, the scan drive circuit 21, the data selection circuit 24, the second reference letter Number line R2 and sensing signal line L also non-can be arranged on the insulated substrate 2a.Such as described 21 He of scan drive circuit The data selection circuit 24 is may also be arranged in the control chip 3, or, it is arranged in other chip, or, with Circuit mode outside chip exists also possible.

Fig. 9 is referred to, Fig. 9 is the structural representation of the another embodiment of bio information sensing device of the present invention.The life Thing information sensor 1 further includes connector 4, and the connector 4 is used to connect the control chip 3 with the biological letter Breath sensor 2.The connector 4 is, for example, flexible circuit board (Flexible Printed Circuit Board, FPCB).Institute State control chip 3 to be for example arranged on the flexible circuit board 4, and passed with the bio information by the flexible circuit board 4 Sensor 2 connects.By the flexible circuit board 4, letter is carried out between the biometric information sensor 2 and the control chip 3 Number transmission.

In this embodiment, the biometric information sensor 2 and the control chip 3 can also be a chip (Chip), or, the biometric information sensor 2 is nude film, and the control chip 3 is chip, or, the bio information is passed Sensor 2 and the control chip 3 are nude film.

In the respective embodiments described above, when the biometric information sensor 2 is nude film or chip, by arranging the data Selection circuit 24 is corresponding to the sensing electrode 111 for controlling timesharing output drive signal to same a line.As the data select electricity Each data selector 241 on road 24 is respectively provided with the Single port (not shown) being connected with the sensing drive circuit 22, institute State port for transmitting pumping signal or sensing signal, correspondingly, each port of correspondence is arranged on the biometric information sensor 2 One connection pin (not shown), to connect the port with the sensing drive circuit 22.So, it is possible to reduce bio information The quantity of the connection pin between sensor 2 and control chip 3.

Ground is changed, in other embodiments, for example, the biometric information sensor 2 is alternatively and is formed in display screen In or display screen on, and be not integrated into a nude film or a chip.In the biometric information sensor 2 is formed in display screen or When on display screen, the control chip 3 can drive a line sensing electrode 111 to perform bio information sensing simultaneously.

Figure 10 is referred to, Figure 10 is the structural representation of another embodiment of sensing unit of the present invention.The sensing unit 11 include 2 first controlling switches 113 being connected in parallel and 2 second controlling switches 115 being connected in parallel.

Figure 11 is referred to, Figure 11 is the structural representation of the another embodiment of bio information sensing device of the present invention.Institute State between drive circuit 20 and each sensing electrode 111 respectively by single data wire L1 connections, omit the first controlling switch 113 and second controlling switch 115.Correspondingly, the drive circuit 20 is by exporting corresponding signal respectively to each sensing electrode 111 is also feasible.

Figure 12 is referred to, Figure 12 is the structural representation of an embodiment of electronic equipment of the present invention.The electronic equipment 9 Including the bio information sensing device 1 described in any of the above-described embodiment.The electronic equipment 9 is, for example, that portable electronic is produced Product, household formula electronic product or vehicle electronics product.However, the electronic equipment does not limit to electronic product listed herein, also It can be the electronic product of other suitable types.The portable electronic product is, for example, mobile terminal, the mobile terminal example It is such as the suitable mobile terminal such as mobile phone, panel computer, notebook computer, Wearable product.The household formula electronic product example It is such as the suitable household formula electronic product such as intelligent door lock, TV, refrigerator, desktop computer.The vehicle electronics product is, for example, The suitable vehicle electronics product such as Vehicular display device, drive recorder, navigator, car refrigerator.

So that the electronic equipment 9 is as mobile phone as an example, the bio information sensing device 1 is just for example being arranged on the mobile phone Any appropriate position such as face, side, the back side, in addition, the bio information sensing device 1 may be configured as exposing the outer of mobile phone Shell, may also be arranged on the inside of mobile phone.In this embodiment, the bio information sensing device 1 is arranged on the front of mobile phone.

According to the bio information sensed by the bio information sensing device 1, the electronic equipment 9 for example carries out user Identification authentication, quickly on-line payment, startup application program (APP) etc..

As the electronic equipment 9 includes the bio information sensing device 1, the sense of the bio information sensing device 1 Survey precision higher, therefore, the better user experience of the electronic equipment 9.

Refer to Figure 13, circuit block diagrams of the Figure 13 for one embodiment of electronic equipment shown in Figure 12.The electronic equipment 9 Further include main control chip 5.The main control chip 5 is connected with the bio information sensing device 1, for believing with the biology Breath sensing device 1 enters row data communication.The main control chip 5 is, for example, one chip or chipset.When main control chip 5 is chip During group, the chipset includes application processor (Application Processor, AP) and power supply chip.In addition, the core Piece group can further include storage chip.When main control chip 5 is one chip, for example, application of the main control chip 5 is processed Device.Further, the application processor also can be replaced central processing unit (Central Processing Unit, CPU).

The main control chip 5 includes earth terminal 50, the connection equipment of the earth terminal 50 ground, the ground connection letter on receiving device ground Number, ground signalling is represented with GND in Fig. 9.Also known as systematically, for example, the power supply of electronic equipment 9 is negative on the equipment ground Pole, power supply is as being battery.Ground signalling GND is also known as system ground voltage, system earth signal, equipment ground voltage or sets Standby earth signal etc..Ground signalling GND is constant voltage, as the voltage reference of each circuit in electronic equipment 9, described Ground signalling GND is, for example, the voltage signals such as 0V (volt), 2V, (- 1) V.Generally, equipment ground not earth ground or definitely Greatly.So, when electronic equipment 9 is connected with earth ground by conductor, it is likely to as earth ground the equipment.

In aforesaid each embodiment, the bio information sensing device 1 is can be with a domain as voltage reference. The domain is the domain on the basis of ground signalling GND.Ground signalling GND is used as each circuit in bio information sensing device 1 Voltage reference.

To improve the signal to noise ratio of the sensing signal of bio information sensing device 1, present invention further propose that using modulation skill Art scheme improves the technical purpose of signal to noise ratio to reach, and the modulation technique scheme is applied to the life described in the respective embodiments described above Thing information sensor 1.

For example, the technical scheme by modulating ground is exported to the signal of sensing unit 11 reaching uniform modulation.

Specifically, the drive circuit 20 for example further includes the first earth terminal 31, the second earth terminal 32, modulation circuit 33rd, and voltage generation circuit 34.The modulation circuit 33 be connected to first earth terminal 31 and second earth terminal 32 it Between.The modulation circuit 33 is further connected with the voltage generation circuit 34.First earth terminal 31 is connected to equipment Ground.The voltage generation circuit 34 is used to provide voltage drive signals to the modulation circuit 33.The modulation circuit 33 Correspond to according to ground signalling GND of the voltage drive signals and the equipment ground modulated signal MGND is produced to described second Earth terminal 32.Modulated signal MGND is exported to the letter on the sensing unit 11 for drive circuit 20 described in uniform modulation Number, for example, first reference signal, second reference signal, the pumping signal, the scanning open signal and institute State scanning pick-off signal.Wherein, (for example, 32) the second earth terminal is modulation ground on the ground of loading modulated signal MGND.

For example, the pumping signal includes first voltage signal and second voltage signal.The pumping signal is first electric The square-wave pulse signal of pressure signal and second voltage signal alternate.Wherein, the first voltage signal is less than described second Voltage signal, the first voltage signal are, for example, ground signalling GND.Modulated signal MGND is electric for raising described second Pressure signal, to improve the signal to noise ratio of sensing signal.

When the drive circuit 20 is received from the sensing signal of the output of sensing electrode 111, need to sensing signal Back-modulation is carried out, corresponding bio information is obtained.

In this embodiment, the bio information sensing device 1 is with two domains as voltage reference.Two domains point Domain 60 on the basis of ground signalling GND and the domain on the basis of modulated signal MGND 70 are not shown as.Wherein, being grounded letter The earth terminal of the circuit in domain 60 on the basis of number GND is directly connected to equipment ground, in the domain on the basis of modulated signal MGND The earth terminal of the circuit in 70 is directly connected to modulation ground.Further, for circuit to modulate as ground, its reference ground electricity Modulated signal MGND that position is loaded by modulation；For the circuit with equipment as ground, its ground reference is equipment ground institute Ground signalling GND of loading.

In the present embodiment, described control unit 30, the scan drive circuit 21, the data selection circuit 24, The reference signal generation circuit 23, and sensing unit 11 be for example arranged in domain 70.The sensing drive circuit 22 is for example A part is located in domain 60, and a part is located in domain 70.The main control chip 5, the modulation circuit 33, the voltage produce electricity Road 34 is located in domain 60.

So, ground is changed, the present invention does not limit to division of the foregoing circuit in domain 60,70, and manufacturer can be according to actual need Will, for example circuit conditions are different, and correspondence does different adjustment etc..

The bio information sensing device 1 can further include that earth lead G, the earth lead G surround the plurality of sensing Unit 11 is arranged, and in some embodiments, the earth lead G is latticed, is located at same layer with the sensing electrode 111, Arrange around the sensing electrode 111 respectively.Ground is changed, the earth lead G is alternatively in the plurality of sensing unit 11 It is also possible that periphery arranges a circle etc..

In addition, when the bio information sensing device 1 be with domain as voltage reference, the domain be to be grounded letter During domain on the basis of number GND, first reference signal and/or second reference signal are, for example, relatively described ground signalling GND is constant voltage signal.So, when the bio information sensing device 1 is with two domains 60 and 70 as voltage reference When, first reference signal and/or second reference signal are, for example, the voltage that relatively described ground signalling GND is change Signal, is constant voltage signal with respect to modulated signal MGND.

Further, except above by the technical scheme for adopting modulation ground, modulation power source end or reference may also be employed The power supply voltage signal of power supply, carrys out drive circuit 20 described in uniform modulation and exports to the signal of the plurality of sensing unit 11.

Need it is further noted that by arranging first controlling switch 113 and the second controlling switch 115, can subtract Few sensing unit 11 (for example, senses the pin that 23) drive circuit 22, reference signal generation circuit is connected with peripheral circuit.

Although embodiment is described already in connection with specific configuration and the sequence of operation here, it should be appreciated that, replace The embodiment in generation can increase, omit or change element, operation etc..Therefore, embodiment disclosed herein is meant to be real Apply example rather than restriction.

Claims

1. a kind of sensor, including：

Multiple sensing units, the sensing unit include：

Sensing electrode；

First controlling switch, is connected with the sensing electrode；With

Second controlling switch, is connected with the sensing electrode；With

Scan drive circuit, is connected with the second controlling switch with the first controlling switch in each sensing unit, respectively for driving The first controlling switch in each sensing unit is turned on the second controlling switch timesharing；

For same row sensing unit：When the sensing electrode of a sensing unit receives excitation by the first controlling switch for turning on During signal, correspondence performs sensing operation, and the sensing electrode in remaining sensing unit receives one by the second controlling switch of conducting First reference signal.

2. sensor according to claim 1, it is characterised in that：It is right that first controlling switch of the conducting is further used for Sensing signal from the sensing electrode is exported.

3. sensor according to claim 1, it is characterised in that：The sensor is capacitance type sensor.

4. sensor according to claim 3, it is characterised in that：The capacitance sensor is self-capacitance sensor.

5. the sensor according to claim 3 or 4, it is characterised in that：The sensor is fingerprint sensor.

6. sensor according to claim 1, it is characterised in that：The plurality of sensing unit is arranged in array, works as institute While stating scan drive circuit and drive the first controlling switch conducting in a line sensing unit, the second controlling switch to end, drive The cut-off of the first controlling switch, the conducting of the second controlling switch in dynamic remaining row sensing unit.

7. sensor according to claim 6, it is characterised in that：The scan drive circuit drives sensing unit to hold by row Row sensing operation.

8. sensor according to claim 6, it is characterised in that：The sensor further includes data selection circuit, The data selection circuit is connected with each sensing unit, for selecting to be the output pumping signal or one second reference Signal gives corresponding sensing electrode.

9. sensor according to claim 8, it is characterised in that：The data selection circuit includes that multiple data are selected Device, each data selector connect at least two row sensing units, and the data selector is used for timesharing output drive signal to phase Each row sensing unit of connection, and it is single to wherein string sensing when the pumping signal is exported by the first controlling switch of conducting When first, the sensing list that second reference signal is connected to remaining several row is further exported by the first controlling switch for turning on Unit.

10. sensor according to claim 9, it is characterised in that：The data selector is in output drive signal to sense While surveying electrode execution sensing operation, further the sensing signal from the sensing electrode is exported.

11. sensors according to claim 9, it is characterised in that：The sensor further includes multiple scanning line-groups Group and multiple data wire groups；Wherein, the plurality of scan line group is connected with the scan drive circuit, per scan line group Group further connects a line sensing unit；The plurality of data wire group is connected with the data selection circuit, each data wire Group further connects string sensing unit；Include the first scan line and the second scan line per scan line group, described first Scan line connects the first controlling switch of a line sensing unit, and second scan line is used for connection with the of a line sensing unit Two controlling switches；Each data wire group includes the first data wire and the second data wire, and first data wire connects biographies First controlling switch of sense unit, second data wire connect the second controlling switch of same row sensing unit.

12. sensors according to claim 11, it is characterised in that：First scan line of the plurality of scan line group and Second scan line extends along line direction, and arranges along column direction；First data wire of the plurality of data wire group and the second number Extend along column direction according to line, and arrange along line direction.

13. sensors according to claim 11, it is characterised in that：When the scan drive circuit drives a line sensing single When the first controlling switch conducting in unit, the second controlling switch are ended, by the first data wire and the first controlling switch of conducting, The plurality of data selector exports the pumping signal every time simultaneously to a sensing electrode, and exports described second with reference to letter Number give remaining sensing electrode.

14. sensors according to claim 13, it is characterised in that：The sensor further includes the first reference signal Line and the second reference signal line, wherein, first reference signal line is connected with the second data wire in each data wire group, institute State the second reference signal line to be connected with the plurality of data selector, first reference signal line and second reference signal It is respectively used to transmit first reference signal and second reference signal；For be connected with same data selector to Few two row sensing units：When the data selector transmits sensing electrode of the pumping signal to wherein string sensing unit When, transmit sensing electrode of second reference signal on the second reference signal line to other row sensing units；For same Row sensing unit：When the sensing electrode of a wherein sensing unit receives the pumping signal, the sensing of remaining sensing unit Electrode receives first reference signal on first reference signal line.

15. sensors according to claim 8, it is characterised in that：First reference signal and the described second reference letter It is number identical.

16. sensors according to claim 1, it is characterised in that：First reference signal and the pumping signal phase Together.

17. sensors according to claim 1, it is characterised in that：The sensing unit include one first controlling switch and One second controlling switch, or, the sensing unit includes 2 first controlling switches being connected in parallel and be connected in parallel 2 second Controlling switch.

18. sensors according to any one in claim 1-17, it is characterised in that：First controlling switch and institute State the second controlling switch and be thin film transistor switch.

19. sensors according to claim 14, it is characterised in that：The sensor further includes insulated substrate, institute State multiple sensing units, the scan drive circuit, the plurality of scan line group, the plurality of data wire group, described One reference signal line, second reference signal line and the data selection circuit are both formed on the insulated substrate, described The sensing electrode of multiple sensing units is formed on the insulated substrate, and the sensing electrode of the plurality of sensing unit covers institute State the first controlling switch, the second controlling switch, the plurality of scan line group and the plurality of data wire group, the insulation Substrate approaches or touches input back to what the side of the plurality of sensing unit was used to receiving target object.

20. sensors according to claim 19, it is characterised in that：The insulated substrate be glass substrate, the sensing Transistor switch in device is thin film transistor switch, and first controlling switch and second controlling switch are thin film Transistor switch.

A kind of 21. sensing devices, including the sensor in claim 1-20 described in any one.

22. sensing devices according to claim 21, it is characterised in that：The sensing device further includes to control core Piece, for controlling the work schedule of the capacitance type sensor, provides the pumping signal by the first controlling switch for turning on Sensing operation is performed to sensing electrode, first reference signal is provided to sensing electrode by the second controlling switch for turning on, And the sensing signal exported from the sensor is received, to obtain associated sensed information.

23. a kind of electronic equipment, including the sensing device described in claim 21 or 22.