CN106462308B - Capacitance-type sensing device and electronic equipment - Google Patents
Capacitance-type sensing device and electronic equipment Download PDFInfo
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- CN106462308B CN106462308B CN201680000683.8A CN201680000683A CN106462308B CN 106462308 B CN106462308 B CN 106462308B CN 201680000683 A CN201680000683 A CN 201680000683A CN 106462308 B CN106462308 B CN 106462308B
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Classifications
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- 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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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
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The present invention provides a kind of capacitance-type sensing device and electronic equipment.The capacitance-type sensing device includes: multiple sensing units and driving circuit.Each sensing unit includes: sensing electrode；First control switch is connect with the sensing electrode；With the second control switch, it is connect with the sensing electrode.The driving circuit is separately connected with the first control switch of the multiple sensing unit and the second control switch, for controlling the first control switch and the second control switch timesharing conducting in same sensing unit, and pumping signal is transmitted by the first control switch of conducting and executes sensing operation to sensing electrode, one first reference signal is transmitted to sensing electrode by the second control switch of conducting.
Description
Technical field
The present invention relates to field of sensing technologies more particularly to a kind of capacitance-type sensing device and there is the condenser type to pass
The electronic equipment of induction device.
Background technique
With the development of society, more and more electronic equipments are (such as: mobile phone, tablet computer, wearable device, Yi Jizhi
The various intellectual products such as energy household) one or more sensing devices generally can be all set.The sensing device includes that sensing such as is used
The touch sensing device of family touch operation, the biological information sensing device for sensing biological information of human body etc..Currently, touch sensing
Device, biological information sensing device etc. mostly use capacitance-type sensing device to execute sensing operation.
By taking biological information sensing device as an example, in general, the biological information sensing device includes multiple in array arrangement
Sensing electrode and the driving circuit that is connected with each sensing electrode.The driving circuit generally hold line by line by driving sensing electrode
Row biological information sensing.
So, when each drive part sensing electrode of the driving circuit executes biological information sensing, remaining sensing electrode
On voltage it is inconsistent since the influences such as signal interference can exist, to execute biological information sensing sensing electricity
The parasitic effects of pole are different and are unknown, and biological information sensing device is relatively high to sensing required precision, thus not
Conducive to the accurate detection of biological information.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, the present invention needs to provide one
Kind capacitance-type sensing device and electronic equipment.
The present invention provides a kind of capacitance-type sensing device, comprising:
Multiple sensing units, each sensing unit include:
Sensing electrode；
First control switch is connect with the sensing electrode；With
Second control switch is connect with the sensing electrode；With
Driving circuit is separately connected with the first control switch of the multiple sensing unit and the second control switch, is used for
The first control switch and the second control switch timesharing conducting in same sensing unit are controlled, and passes through the first control switch of conducting
It transmits pumping signal and executes sensing operation to sensing electrode, one first reference signal is transmitted by the second control switch of conducting and is given
Sensing electrode.
Optionally, first reference signal is identical as the pumping signal.
Optionally, for same row sensing electrode:
When the conducting of the first control switch, the cut-off of the second control switch in driving circuit driving wherein a sensing unit
When, some or all of drive in remaining sensing unit the cut-off of the first control switch, the conducting of the second control switch of sensing unit.
Optionally, the driving circuit provides the pumping signal by the first control switch be connected and holds to sensing electrode
Row biological information sensing, and the sensing signal exported from sensing electrode is received, to execute the sensing operation of self-capacitance.
Optionally, the driving circuit includes scan drive circuit, senses driving circuit and reference signal generation circuit,
Wherein, the scan drive circuit is used to drive the conducting and cut-off of first control switch Yu second control switch,
The sensing driving circuit is used to that sensing electrode to be driven to execute sensing operation by the first control switch of conducting, described with reference to letter
Number generation circuit is used to provide second reference signal by the second control switch of conducting to sensing electrode.
Optionally, when the scan drive circuit drives the first control switch of a line sensing unit to be connected, second controls
When switch cut-off, the sensing driving circuit provides the pumping signal by the first control switch of conducting simultaneously and feels to part
It surveys electrode and executes sensing operation, the first control switch that the reference signal generation circuit further passes through conducting provides same the
Sensing electrode of two reference signals to sensing unit some or all of in remaining sensing unit.
Optionally, second reference signal is identical as first reference signal.
Optionally, for the sensing electrode of same a line: drive part sensing electrode executes the driving circuit simultaneously every time
Sensing operation, by repeatedly driving, until having driven a line sensing electrode to execute sensing operation.
Optionally, the driving circuit further comprises multiple data selectors, and the multiple data selector connects institute
Reference signal generation circuit and the sensing driving circuit are stated, each data selector further passes through the connection of the first control switch
The sensing electrode of part sensing unit, the data selector is for selecting to export the pumping signal or described second with reference to letter
Number give sensing electrode.
Optionally, the driving circuit once exports the pumping signal by each data selector simultaneously and gives a sense respectively
It surveys electrode and executes sensing operation, and second reference signal is exported to remaining sense with a line by each data selector respectively
Sensing electrode some or all of in survey electrode.
Optionally, the capacitance-type sensing device further comprises control unit, and described control unit and the scanning are driven
Dynamic circuit and the multiple data selector are separately connected, and are driven in each row sensing unit for controlling the scan drive circuit
The first control switch and the second control switch conducting timing, and it is defeated to control by controlling the multiple data selector
The pumping signal is with second reference signal to the timing of sensing electrode out.
Optionally, the capacitance-type sensing device further comprises:
Multiple scan line groups, the scan line group include the first scan line and the second scan line；With
Multiple data line groups, the data line group include the first data line and the second data line；
Every scan line group connects a line sensing unit, and each data line group connects a column sensing unit；
First control switch includes coordination electrode, the first transmission electrode and the second transmission electrode；Second control
Switch includes coordination electrode, the first transmission electrode and the second transmission electrode；First scan line connects the turntable driving electricity
The coordination electrode on road and first control switch；Second scan line connects the scan drive circuit and second control
Make the coordination electrode of switch；First data line connects the first transmission electricity of the data selector and the first control switch
Pole；Second data line connects the first transmission electrode of the reference signal generation circuit and the second control switch；Described
Second transmission electrode of one control switch connects the sensing electrode；Second transmission electrode of second control switch connects institute
State sensing electrode.
Optionally, first data line is used for transmission the pumping signal and second reference signal, and described second
Data line is used for transmission first reference signal, and the scan drive circuit passes through first scan line, the second scan line
Scanning open signal is provided to the first control switch and the second control switch, to control the first control switch and the second control switch
Conducting provides scanning pick-off signal by first scan line, the second scan line and opens to the first control switch and the second control
It closes, to control the first control switch and the cut-off of the second control switch.
Optionally, the capacitance-type sensing device further comprises:
First reference signal line connects the reference signal generation circuit and the second data line, is used for transmission described first
Reference signal；
Second reference signal line connects the reference signal generation circuit and the multiple data selector, is used for transmission
Second reference signal；With
Sensing signal line connects the sensing driving circuit and the multiple data selector, is used for transmission the excitation
Signal gives sensing driving circuit to sensing electrode and sensing signal of the transmission from sensing electrode.
Optionally, the capacitance-type sensing device includes capacitance type sensor, and the capacitance type sensor includes insulation base
Plate, the multiple sensing unit, the multiple scan line group, the multiple data line group and first reference signal
Line, the multiple sensing unit, the multiple scan line group, the multiple data line group and first reference signal
Line is formed on the insulating substrate.
Optionally, the first control switch in each sensing unit and the second control switch are that thin film transistor (TFT) is opened
It closes, the insulating substrate is glass substrate.
Optionally, the sensing unit includes one first control switch and one second control switch, or, the sensing unit
Including 2 first control switches being connected in parallel and 2 second control switches being connected in parallel.
Optionally, the insulating substrate includes first surface and the second surface that is oppositely arranged with first surface, and described
One surface is used to receive the touch or close input of target object, the multiple sensing unit, the multiple scan line group, institute
It states multiple data line groups and first reference signal line is arranged in the second surface.
Optionally, the sensing electrode of the multiple sensing unit is compared to first control switch, second control
Switch, the multiple scan line group and the multiple data line group are closer to the second surface.
Optionally, first control switch, second control switch, the multiple scan line group and described more
A data line-group group is located at the sensing electrode of the multiple sensing unit back to the side of the insulating substrate.
Optionally, the sensing electrode of the multiple sensing unit covers first control switch, second control is opened
Pass, the multiple scan line group and the multiple data line group.
Optionally, the capacitance type sensor further comprise the scan drive circuit, the multiple data selector,
Second reference signal line and the sensing signal line, it is the scan drive circuit, the multiple data selector, described
Second reference signal line and the sensing signal line are formed on the second surface of the insulating substrate.
Optionally, the scan drive circuit, the multiple data selector, second reference signal line and described
Sensing signal line is arranged in around the multiple sensing unit.
Optionally, the scan drive circuit and the multiple data selector include control switch, and the control is opened
Pass is thin film transistor switch.
Optionally, each data selector includes multiple switch unit, each switch unit include first choice switch and
Second selection switch, first choice switch include coordination electrode, the first transmission electrode and the second transmission electrode, and described the
Two selection switches include coordination electrode, the first transmission electrode and the second transmission electrode, wherein the control of the first choice switch
The coordination electrode of electrode processed and the second selection switch is separately connected with described control unit, and the first of the first choice switch passes
Transmission pole is connect with the sensing driving circuit, and the first transmission electrode of the second selection switch and the reference signal generate
Circuit connection, the second transmission electrode of the first choice switch are connected with the second transmission electrode of the second selection switch
It connects and is connected to the first data line.
Optionally, described control unit controls the switch of the first choice in same switch unit and the second selection switchs timesharing
Conducting.
Optionally, the capacitance type sensor further comprises passivation layer, is formed in the multiple sensing unit, described more
On a scan line group, the multiple data line group and first reference signal line.
Optionally, the capacitance-type sensing device further comprises control chip, and the control chip includes the control
Unit, the reference signal generation circuit and the sensing driving circuit.
Optionally, the capacitance type sensor and the control chip are respectively bare die, and the control chip bonding is in institute
It states on insulating substrate；Alternatively, the control chip is arranged on a flexible circuit board, pass through the flexible circuit board and the electricity
Capacity sensor electrical connection.
Optionally, the driving circuit further comprises modulation circuit, and the modulation circuit described in uniform modulation for driving
Dynamic circuit output gives the signal of the multiple sensing unit, to improve the signal-to-noise ratio of sensing signal.
Optionally, the capacitance-type sensing device is fingerprint sensing device.
Since the sensing unit of capacitance-type sensing device of the invention further comprises the first control switch and the second control
Switch, therefore, the driving circuit can be connected by controlling first control switch and the second control switch timesharing, Lai Tong
While crossing the first control switch driving sensing electrode execution sensing operation of conducting, further opened by the second control of conducting
It closes and provides the first reference signal to sensing electrode, to be applied with the sensing electrode of first reference signal to executing sensing
Sensing electrode parasitic effects be known to, correspondingly, the driving circuit can reject during obtaining biological information
Known parasitic effects, to improve the precision of sensing operation.
Further, the capacitance-type sensing device is driving the section senses electrode in every row sensing electrode to execute sensing
When operation, the second reference signal is provided to the sensing electrode some or all of in remaining sensing electrode of same a line, to apply
Sensing electrode added with second reference signal is to know to the parasitic effects of the sensing electrode in execution sensing, accordingly
Ground, the driving circuit can reject known parasitic effects during obtaining biological information, to improve sensing operation
Precision.
The present invention further provides a kind of electronic equipment, the electronic equipment include it is any one of above-mentioned described in capacitor
Formula sensing device.
Since the electronic equipment includes the capacitance-type sensing device, the user experience of the electronic equipment compared with
It is high.
Detailed description of the invention
Fig. 1 is the electrical block diagram of one embodiment of biological information sensing device of the present invention.
Fig. 2 is the top view of the part-structure of biological information sensing device shown in Fig. 1.
Fig. 3 is the circuit structure signal of an embodiment of the data selection circuit of biological information sensing device shown in Fig. 1
Figure.
Fig. 4 is the structural schematic diagram of another embodiment of biological information sensing device of the present invention.
Fig. 5 is the cut-away section structural schematic diagram of biological information sensing device shown in Fig. 4.
Fig. 6 is the usage state diagram of biological information sensing device shown in Fig. 4.
Fig. 7 is the production method flow chart of an embodiment of biometric information sensor shown in Fig. 3.
Fig. 8 is the method flow diagram for making the first control switch and the second control switch.
Fig. 9 is the partial structure diagram of the another embodiment of the utility model biological information sensing device.
Figure 10 is the top view of another embodiment of the sensing unit of the utility model biological information sensing device.
Figure 11 is the partial structure diagram of the another embodiment of the utility model biological information sensing device.
Figure 12 is the structural schematic diagram of an embodiment of the utility model electronic equipment.
Figure 13 is the circuit structure block diagram of an embodiment of electronic equipment shown in Figure 12.
Specific embodiment
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing 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；On the contrary, thesing embodiments are provided so that the present invention will be full and complete, and example is implemented
The design of mode is comprehensively communicated to those skilled in the art.It is for convenience or clear, it may exaggerate, omit or schematically show
Out in the accompanying drawings shown in every layer thickness and size and the quantity for schematically illustrating related elements.In addition, the size of element
The not exclusively quantity of reflection actual size and related elements not exclusively reflects actual quantity.Because of originals such as attached drawing are of different sizes
Cause, in different drawings shown in same or similar or related elements quantity there is a situation where it is not consistent.The phase in figure
Same appended drawing reference indicates same or similar structure.So, it should be noted that in order to enable label has regularity and patrols
Property etc. is collected, in certain different embodiments, same or similar element or structure use different appended drawing references, according to technology
Relevance and related text explanation, those skilled in the art is can directly or indirectly to judge to learn.
In addition, described feature, structure can be incorporated in any suitable manner in one or more embodiments.
In the following description, many details are provided to provide and fully understand to embodiments of the present invention.However, ability
Field technique personnel will be appreciated that it is one or more in no specific detail, or using other structures, constituent element etc.,
Technical solution of the present invention can also be practiced.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 is limited in any way.Read the application it
Afterwards, it would be recognized by those skilled in the art that the statement of these terms be suitable for technology, method, physical component and system (no matter mesh
It is preceding whether to know), including read those skilled in the art after the application and be inferred to or its educible extension.
In the description of the present invention, it is to be understood that: " multiple " includes two and two or more, and " a plurality of " includes two
With two or more, except non-present invention separately has clearly specific restriction." at least two column " include two column, three column, four column, five column etc. by
Cumulative more various suitable situations.In addition, the words such as " first " that occurs in each element title and signal name, " second " are simultaneously
Do not limit the sequencing that element or signal occur, named for convenience of element and signal, clearly distinguish each element with
And each signal, so that description is more succinct.
Need further exist for explanation: capacitance-type sensing device provided by the invention is suitable for biological information sensing device,
Especially fingerprint sensing device.So, the present invention is not limited thereto, the capacitance-type sensing device also applicable other suitable types
Sensing device, such as touch sensing device.The biological information sensing device is used to sense the predetermined biological information of target object.
The finger of the target object for example user, the other parts that can also be user's body, such as palm, toe, ear, or even
It can be the object of other suitable types, and be not limited to human body.Described predetermined biological information for example fingerprint, palmmprint, ear line etc..
In the following, being said so that capacitance-type sensing device is biological information sensor as an example to various embodiments of the present invention
It is bright.
Also referring to Fig. 1 and Fig. 2, Fig. 1 is that the circuit structure of one embodiment of biological information sensing device of the present invention shows
It is intended to.Fig. 2 is the top view of the part-structure of biological information sensing device shown in Fig. 1.The biological information sensing device 1 includes
Multiple sensing electrodes 111 and driving circuit 20.The driving circuit 20 is connected with the multiple sensing electrode 111, for driving
It moves the multiple sensing electrode 111 and executes biological information sensing.
In general, 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 driving circuit 20, biological information sensing device 1 can be from electricity
The biological information sensing device of the biological information sensing device of appearance formula either mutual capacitance type.
In the biological information sensing device based on mutual capacitance type, the biological information sensing device of the mutual capacitance type can be wrapped
Include multiple driving electrodes and multiple sensing electrodes.Mutual capacitance is formed between each driving electrodes and a sensing electrode.In sensing,
Driving circuit provides pumping signal to driving electrodes, and receives the sensing signal exported from sensing electrode.When target object connects
When the close or touch biological information sensing device, it is formed in the quantity of electric charge meeting of the mutual capacitance between driving electrodes and sensing electrode
There is corresponding variation, thus, sensing electrode can export corresponding sensing signal to driving circuit, and then obtain associated biomolecule letter
Breath.
In the biological information sensing device based on self-capacitance, the biological information sensing device of the self-capacitance includes
Multiple sensing electrodes.Each sensing electrode can form capacitor over the ground.In sensing, driving circuit provides pumping signal to sensing
Electrode, and receive the sensing signal exported from sensing electrode.When target object approaches or touches the biological information sensing dress
When setting, capacitor is formed between target object and sensing electrode, causes the variation of the quantity of electric charge in sensing electrode, thus, sensing electricity
Pole exports corresponding sensing signal to driving circuit, and then obtains relevant biological information.
In the present embodiment, the biological information sensing device 1 is, for example, the sensing device of self-capacitance.
The multiple sensing electrode 111 is arranged in multiple lines and multiple rows mode.So, ground, in other embodiments, institute are changed
Stating multiple sensing electrodes 111 can also arrange in Else Rule or non-regular.
For the sensing electrode 111 of same row: being held when the driving circuit 20 provides pumping signal to a sensing electrode 111
When row biological information senses, one first reference signal is provided to sensing electrode some or all of in remaining sensing electrode 111
111.Preferably, the driving circuit 20, which provides first reference signal, gives remaining whole sensing electrode 111.
Since the driving circuit 20 is providing the pumping signal to the sensing electrode in each column sensing electrode 111
When 111, first reference signal is provided to rest part or whole sensing electrodes 111, thus, it is applied with first reference
The sensing electrode 111 of signal is known to the parasitic effects in the sensing electrode 111 for executing biological information sensing, thus, institute
Known parasitic effects can be offset in the subsequent calculating to biological information by stating driving circuit 20, and then improve the sense of biological information
Survey precision.
First reference signal is, for example, constant voltage signal.
Alternatively, the pressure difference between first reference signal and the pumping signal remains unchanged, for example, first ginseng
Examine that signal is identical as the pumping signal, thus reduce remaining sensing electrode 111 in the sensing electricity for executing biological information sensing
The charge/discharge electricity amount of parasitic capacitance between pole 111 further increases the sensing precision of biological information.
In the present embodiment, the driving circuit 20 drives sensing electrode 111 to execute biological information sensing line by line.So,
Ground is changed, in other embodiments, the driving circuit 20 once can also drive multirow sensing electrode 111 to execute life simultaneously
Object information sensing.
Further, in the present embodiment, for the sensing electrode 111 of same a line: the driving circuit 20 mentions simultaneously
Biological information sensing is executed to section senses electrode 111 for the pumping signal, and one second reference signal is provided and gives remaining sense
Sensing electrode 111 some or all of in survey electrode 111.It is all sensed preferably, providing second reference signal to remaining
Electrode 111.
For the sensing electrode 111 of same a line: the driving circuit 20 by successively repeatedly providing the excitation letter simultaneously
Number to section senses electrode 111 execute biological information sensing, thus driven a line sensing electrode 111 execute biological information sense
It surveys.
When the multiple sensing electrode 111 is formed on a chip, driven using the timesharing to a line sensing electrode 111
Mode, so as to reduce the pin number on the chip, in this regard, having related narration below.
So, ground is changed, in other embodiments, the driving circuit 20 can also drive the sensing electrode of a line simultaneously
111 are performed both by biological information sensing.For example, the multiple sensing electrode 111 is formed in display screen.When the multiple sensing
Electrode 111 is arranged when on chip, and the driving circuit is also that the sensing electrode 111 of a line can be driven to be performed both by biological letter simultaneously
Breath sensing.
In addition, since the driving circuit 20 is providing the pumping signal to the part sense in each row sensing electrode 111
When surveying electrode 111, second reference signal is provided to sensing electrode 111 some or all of in remaining sensing electrode 111, from
And the sensing electrode 111 of second reference signal is applied with to the parasitism in the sensing electrode 111 for executing biological information sensing
Influence is known, thus, the driving circuit 20 can offset known parasitic effects in the subsequent calculating to biological information,
And then improve the sensing precision of biological information.
Second reference signal is, for example, constant voltage signal.
Alternatively, the pressure difference between second reference signal and the pumping signal remains unchanged, for example, second ginseng
Examine that signal is identical as the pumping signal, thus reduce remaining sensing electrode 111 in the sensing electricity for executing biological information sensing
The charge/discharge electricity amount of parasitic capacitance between pole 111 further increases the sensing precision of biological information.
In some embodiments, the biological information sensing device 1 includes multiple sensing units 11.Each sensing
Unit 11 includes a sensing electrode 111, the first control switch 113 and the second control switch 115.First control is opened
113, second control switch 115 is closed to connect with the sensing electrode 111.
The driving circuit 20 includes scan drive circuit 21, sensing driving circuit 22 and reference signal generation circuit 23.
The scan drive circuit 21 in the multiple sensing unit 11 the first control switch 113 and the second control switch 115 divide
It does not connect, for driving the first control switch 113 and 115 timesharing of the second control switch conducting in each sensing unit 11.Institute
It states sensing driving circuit 22 to connect by the first control switch 113 in each sensing unit 11 with sensing electrode 111, for passing through
First control switch 113 of conducting provides the pumping signal and executes biological information sensing to sensing electrode 111.The reference letter
Number generation circuit 23 is connect by the second control switch 115 in each sensing unit 11 with the sensing electrode 111, for passing through
Second control switch 115 of conducting provides first reference signal to sensing electrode 111.
For the sensing electrode 111 of same row: when the scan drive circuit 21 drives first in a sensing unit 11
When the conducting of control switch 113, the cut-off of the second control switch 115, some or all of drive in remaining sensing unit 11 sensing single
The cut-off of the first control switch 113, the conducting of the second control switch 115 of member 11, the reference signal generation circuit 23 pass through conducting
The second control switch 115 provide first reference signal to sensing electrode 111.
The sensing driving circuit 22 provides the pumping signal to sensing electrode by the first control switch 113 of conducting
111 execute biological information sensing, and receive the sensing signal exported from sensing electrode 111, to obtain biological information.
Further, when the scan drive circuit 21 driving a line sensing unit 11 the first control switch 113 conducting,
When the cut-off of the second control switch 115, described in the first offer simultaneously of control switch 113 of the sensing driving circuit 22 by conducting
Pumping signal gives section senses electrode 111 to execute biological information sensing, and the reference signal generation circuit 23 passes through the of conducting
One control switch 113 provides second reference signal to the sense of sensing unit 11 some or all of in remaining sensing unit 11
Survey electrode 111.
In the present embodiment, the driving circuit 20 can further comprise data selection circuit 24, the data selection
Circuit 24 is separately connected with the sensing driving circuit 22 and the reference signal generation circuit 23.The data selection circuit 24
Further it is connect with the first control switch 113 in each sensing unit 11.For each sensing unit 11, selected by the data
Circuit 24 selects the second reference signal provided by the output reference signal generation circuit 23 or the output sensing
Pumping signal provided by driving circuit 22 is to sensing electrode 111.When the data selection circuit 24 exports the pumping signal
When to a sensing electrode 111, sensing signal that the sensing electrode 111 is sensed further is exported to the driving circuit 20.
Since the driving circuit 20 is provided with the data selection circuit 24, so as to realize the sensing electricity to each row
Pole 111 carries out timesharing and executes biological information sensing.
In one embodiment, the data selection circuit 24 includes multiple data selectors (Multiplexer) 241.
Each 241 coupling part sensing unit 11 of data selector, and further with the reference signal generation circuit 23 and the sense
Driving circuit 22 is surveyed to be separately connected.The multiple data selector 241 exports the pumping signal or described second for selecting
Reference signal is to sensing electrode 111.Optionally, each data selector 241 connects at least two column sensing units 11.
The driving circuit 20 is primary to export the pumping signal to a sensing by each data selector 241 simultaneously respectively
Electrode 111 executes biological information sensing, and exports second reference signal respectively to same a line by each data selector 241
Remaining sensing electrode 111 in some or all of sensing electrode 111.
The driving circuit 20 by the first control of each data selector 241 and conducting by successively repeatedly being opened simultaneously
It closes 113 and exports the pumping signal to sensing electrode 111, to have driven a line sensing electrode 111 to execute biological information sensing.
Ground is changed, in other embodiments, the data selection circuit 24 can also be other suitable circuit knots
Structure, it is not limited to multiple data selectors 241 described herein.In addition, when the driving circuit 20 while providing described sharp
When encouraging sensing electrode 111 of the signal to every row, the data selection circuit 24 can also be omission.
The driving circuit 20 can further comprise control unit 30.Described control unit 30 and the scan drive circuit
21 and the multiple data selector 241 be separately connected, drive each row sensing unit for controlling the scan drive circuit 21
The conducting timing of the first control switch 113 and the second control switch 115 in 11, and by controlling the multiple data selection
Device 241 exports the pumping signal and second reference signal to the timing of sensing electrode 111 to control.
For example, described control unit 30 controls the scan drive circuit 21 is connected the first control switch 113 line by line, and
When controlling the first control switch 113 conducting of each row sensing unit 11, the sensing of the part row or whole rows in remaining row is controlled
Second control switch 115 of unit 11 is connected.For same sensing unit 11: described control unit 30 controls the turntable driving
The first control switch 113 and the second control switch 115 is connected in 21 timesharing of circuit.
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 biological information sensing device 1 for example further comprise multiple scan line group B and
Multiple data line group D.Every scan line group B connects a line sensing unit 11, each one biographies sense of data line group D connection
Unit 11.
Specifically, every scan line group B includes the first scan line B1 and the second scan line B2.Each data line group D
Including the first data line D1 and the second data line D2.
First control switch 113 includes coordination electrode G1, the first transmission electrode S11 and the second transmission electrode S12.
Second control switch 115 includes coordination electrode G2, the first transmission electrode S21 and the second transmission electrode S22.Described first
Scan line B1 connects the coordination electrode G1 of the scan drive circuit 21 and first control switch 113.Second scanning
Line B2 connects the coordination electrode G2 of the scan drive circuit 21 and second control switch 115.The first data line D1
Connect the first transmission electrode S11 of the data selector 241 and the first control switch 113.The second data line D2 connection
First transmission electrode S21 of the reference signal generation circuit 23 and the second control switch 115.First control switch 113
The second transmission electrode S12 connection sensing electrode 111.Second transmission electrode S22 connection of second control switch 115
The sensing electrode 111.
The first data line D1 is used for transmission the pumping signal and second reference signal, second data line
D2 is used for transmission first reference signal, and the scan drive circuit 21 passes through the first scan line B1, the second scan line
B2 provides scanning open signal to the first control switch 113 and the second control switch 115, to control 113 He of the first control switch
The conducting of second control switch 115 provides scanning pick-off signal to the first control by the first scan line B1, the second scan line B2
Switch 113 and the second control switch 115 are made, opens the cut-off of 115 passes to control the first control switch 113 and the second control.
The first scan line B1 and the second scan line B2 extends along line direction, arranges along column direction.First number
Extend along column direction according to line D1 and the second data line D2, arranged along line direction.
In some embodiments, the biological information sensing device 1 for example further comprise the first reference signal line R1,
Second reference signal line R2 and sensing signal line L.The first reference signal line R1 connection reference signal generation circuit 23
With the second data line D2, it is used for transmission first reference signal.The second reference signal line R2 connection reference signal
Generation circuit 23 and the multiple data selector 241 are used for transmission second reference signal.The sensing signal line L connects
The sensing driving circuit 22 and the multiple data selector 241 are connect, is used for transmission the pumping signal to sensing electrode 111
And sensing signal of the transmission from sensing electrode 11 gives sensing driving circuit 22.
The first reference signal line R1, the second reference signal line R2 and sensing signal line L mainly extend along line direction.
Referring to Fig. 3, Fig. 3 is the circuit structure signal of an embodiment of present invention data selector 241 shown in FIG. 1
Figure.The data selector 241 include 8 switch units 243, each switch unit 243 include a first choice switch S1 with
One second selection switch S2.The first choice switch S1 includes coordination electrode G3, the first transmission electrode S31 and the second transmission
Electrode S32.The second selection switch S2 includes coordination electrode G4, the first transmission electrode S41 and the second transmission electrode S42.Institute
State control unit 30 in each switch unit 243 coordination electrode G3 and coordination electrode G4 be separately connected.First transmission
Electrode S31 is connect with the sensing driving circuit 22.The first transmission electrode S41 and the reference signal generation circuit 23 connect
It connects.The second transmission electrode S32 and the second transmission electrode S42 in each switch unit 243 are connected, and are connected to the first control
Make the first transmission electrode S11 of switch 113.
For same switch unit 243: described control unit 30 controls the selection of the first choice switch S1 and second and opens
Close S2 timesharing conducting, that is, when first choice switch S1 conducting, the second selection switch S2 cut-off, when the second selection switch S2 is led
When logical, first choice switch S1 cut-off.For same data selector 241: when described control unit 30 controls a switch unit
When first choice switch S1 conducting, the second selection switch S2 in 243 end, the first choosing in rest switch unit 243 is controlled
Select switch S1 cut-off, the second selection switch S2 conducting.By the first choice switch S1 of conducting, the sensing driving circuit 22 is mentioned
For the sensing electrode 111 for the sensing unit 11 that the pumping signal to the first control switch 113 is connected；Pass through the second choosing of conducting
Switch S2 is selected, the reference signal generation circuit 23 provides the biography that second reference signal is connected to the second control switch 115
Feel the sensing electrode 111 of unit 11.
In the present embodiment, the quantity of the multiple data selector 241 is, for example, 16, each data selector
241 include 8 switch units 243.It accordingly, is 128 with the quantity of the sensing electrode of a line 111.
It should be noted that being limited to the size of attached drawing in Fig. 1, Fig. 1 only shows each data selector 241 and distinguishes
It is connect with two column sensing units 11, if corresponding with the structure of data selector 241 shown in Fig. 3, Fig. 1 is actually omitted often
The structure that one data selector 241 is also connected with other six column sensing unit 11.In addition, the structure of aftermentioned Fig. 4 and Fig. 1 institute
The structure shown is corresponding, and the structure that each data selector 241 is also connected with other six column sensing unit 11 is equally omitted,
It explains in this together.
Correspondingly, the driving circuit 20 for example exports 16 by 16 data selectors 241 every time simultaneously and swashs
Corresponding 16 sensing electrodes 111 to a line of signal are encouraged, and it is corresponding to a line to export 112 the second reference signals simultaneously
112 sensing electrodes 111.
By taking the biological information sensing device 1 is fingerprint sensing device as an example, when the finger of user approach or touch it is described
When the sensing electrode 111 of multiple sensing units 11, since ridge, paddy are different at a distance from sensing electrode 111, ridge, paddy and sense
It is corresponding different to survey the capacitor that electrode 111 is respectively formed, so that the influence to the quantity of electric charge in sensing electrode 111 is just different, from
And driving circuit 20 can know corresponding finger print information according to the sensing signal that sensing electrode 111 exports.
The working principle of 1 one embodiment of biological information sensing device is as follows.
Described control unit 30 controls the first choice switch S1 in the switch unit 243 in each data selector 241
Conducting, the second selection switch S2 cut-off, the first choice controlled in the rest switch unit 243 in each data selector 241 are opened
S1 cut-off is closed, the second selection switch S2 conducting, correspondingly, the sensing driving circuit 22 in each data selector 241 by leading
Logical first choice switch S1 is provided in the pumping signal to the first data line D1, and the reference signal generation circuit 23 passes through
The the second selection switch S2 be connected in each data selector 241 is provided in second reference signal to the first data line D1.It is logical
The multiple control of described control unit 30 is crossed, the first choice in each switch unit 243 in each data selector 241 is opened
Close S1 timesharing conducting.
Described control unit 30 controls the scan drive circuit 21 and drives the conducting of the first control switch 113, second line by line
Control switch 115 end, and control each row respectively the first control switch 113 conducting, the second control switch 115 cut-off it is same
When, control the cut-off of the first control switch 113, the conducting of the second control switch 115 of remaining row, correspondingly, first data line
Pumping signal on D1 is exported by the first control switch 113 of conducting to sensing electrode 111, and is received and come from sensing electrode
The sensing signal of 111 outputs, to execute biological information sensing, the second reference signal on the first data line D1 passes through conducting
The output of the first control switch 113 to sensing electrode 111, in addition, the reference signal generation circuit 23 passes through the second of conducting
Control switch 115 provides first reference signal to sensing electrode 111.
By when each secondary drive part sensing electrode 111 executes biological information sensing, providing the first reference signal and the
Two reference signals give remaining corresponding sensing electrode 111, come improve the biological information sensing device 1 biological information sensing
Precision.
Also referring to Fig. 1, fig. 4 to fig. 6, Fig. 4 is the knot of another embodiment of biological information sensing device of the present invention
Structure schematic diagram.Fig. 5 is the cut-away section structural schematic diagram of biological information sensing device shown in Fig. 4.Fig. 6 is the letter of biology described in Fig. 4
Cease the usage state diagram of sensing device.The biological information sensing device 1 includes biometric information sensor 2.The biological information
Sensor 2 includes insulating substrate 2a, the multiple sensing unit 11, the multiple scan line group B, the multiple data line-group
Group D and the first reference signal line R1.The multiple sensing unit 11, the multiple scan line group B, the multiple number
It is formed on the insulating substrate 2a according to line-group group D and the first reference signal line R1.
In the present embodiment, the first control switch 113 and the second control switch 115 in each sensing unit 11
It is such as thin film transistor (TFT) (Thin Film Transistor, TFT) switch, the insulating substrate 2a is, for example, glass substrate,
To make the biometric information sensor 2 using the technique of TFT switch is formed on glass substrate, and then reduce biology letter
Cease sensor 2 and the manufacturing cost including the biometric information sensor 2.When first control switch 113, second
When control switch 115 is thin film transistor switch, coordination electrode G1, G2 is 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, which is not intended to limit the insulating substrate 2a, can also be the insulation base of other suitable types
Plate, equally, also not limiting first control switch 113 and second control 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 types such as thin film transistor switch, amorphous silicon film transistor switch.Preferably, institute
Thin film transistor switch is stated as low-temperature polysilicon film transistor switch.
The insulating substrate 2a includes the first surface A1 and second surface A2 being oppositely arranged with first surface A1, and described
One surface A 1 is used to receive the touch or close input of target object, the multiple sensing unit 11, the multiple scanning line-group
Group B, the multiple data line group D and the first reference signal line R1 are arranged in the second surface A2.
The sensing electrode 111 of the multiple sensing unit 11 is compared to first control switch 113, second control
Switch 113, the multiple scan line group B and the multiple data line-group D group are closer to the second surface A2.
First control switch 113, second control switch 115, the multiple scan line group B and described more
A data line-group group D is located at the sensing electrode 111 of the multiple sensing unit 11 back to the side of the insulating substrate 2a.
Preferably, the sensing electrode 111 of the multiple sensing unit 11 covers first control switch 113, described
Two control switches 115, the multiple scan line group B and the multiple data line group D.
The biometric information sensor 1 further comprises passivation layer 16, and the passivation layer 16 is arranged in the multiple sensing
On unit 11, the multiple scan line group B, the multiple data line group D and the first reference signal line R1.
The passivation layer 16 is used to planarize the surface of the biometric information sensor 2, and single to the multiple sensing
The elements such as member 11 are protected.
It is the production method flow chart of an embodiment of biometric information sensor 2 also referring to Fig. 5 and Fig. 7, Fig. 7.
The biometric information sensor 2 the production method is as follows.
F1: an insulating substrate 2a is provided；
The insulating substrate 2a is, for example, glass substrate.
F2: the multiple sensing electrode 111 is formed on the insulating substrate 2a；
The sensing electrode 111 is for example made of metal material.So, ground is changed, the sensing electrode 111 can also be to have
Other suitable conductive materials are made, for example, the sensing electrode 111 can also be made of transparent conductive material, it is described transparent
Conductive material is, for example, tin indium oxide, indium zinc oxide etc..In addition, the sensing electrode can also be by alloy materials systems such as molybdenum lithium molybdenums
At.
F3: in forming the first insulating layer 12 in the multiple sensing electrode 111；
First insulating layer 12 is, for example, that the materials such as silica, silicon nitride are made.
The first control switch 113 and the second control switch 115 are formed on F4: Yu Suoshu first insulating layer 12, and in described
It is formed on first insulating layer 12 and is through to the through-hole H of sensing electrode 111, by the through-hole H, the first control switch 113 and the
Two control switches 115 are connect with sensing electrode 111；
The first control switch 113 and the second control switch 115 of each sensing unit 11 are formed in sensing electrode 111
Side, and be connected respectively by through-hole H with sensing electrode 111.
Passivation layer 16 is formed in F5: Yu Suoshu first control switch 113 and second control switch 115.
The production of biometric information sensor 2 finishes.It should be noted that omitting and being formed in above-mentioned production method
The step of the multiple scan line group B, multiple data line group D and the first reference signal line R1.
Since the manufacture craft of the biometric information sensor 2 formed according to above-mentioned production method is simple, no longer need to additionally set
It sets a cover sheet or forms coat (Coating layers), so as to save manufacturing cost.
So, ground is changed, in other embodiments, the production method of the biometric information sensor 2 can also are as follows: in institute
The first control switch 113 and the second control switch 115 for forming each sensing unit 11 on insulating substrate 2a are stated, is opened in the first control
The first insulating layer 12 is formed on pass 113 and the second control switch 115, and is through to first in being formed on first insulating layer 12
The through-hole H of second transmission electrode of control switch 113 and the second transmission electrode S22 of the second control switch 115, then described
First control switch 113 and second control switch 115 for connecting each sensing unit 11 are formed on first insulating layer 12
On sensing electrode 111, next, in sensing electrode 111 be arranged cover sheet or formed coat (Coating layers).
In this way, also possible.It should be noted that also omit to the multiple scan line group B, multiple data line groups herein
And description the step of the first reference signal line R1 D,.
It continues with refering to Fig. 5, and is to make the first control switch 113 to open with the second control also referring to Fig. 8, Fig. 8
Close 115 method flow diagram.It is right by taking the first control switch 113 and the second control switch 115 are amorphous silicon film transistor as an example
Formed during making biometric information sensor 2 manufacturing method of first control switch 113 and the second control switch 115 into
Row is described as follows.
The coordination electrode G1 and the second control switch of the first control switch 113 are formed on F41: Yu Suoshu first insulating layer 12
115 coordination electrode G2；
Second insulating layer 13 is formed on F42: Yu Suoshu first insulating layer 12, coordination electrode G1, G2；
The second insulating layer 13 is, for example, that the materials such as silica, silicon nitride are made.
Active layer 14,15 is formed in F43: Yu Suoshu second insulating layer 13；
The active layer 14,15 is amorphous silicon layer.
It is formed in F44: Yu Suoshu second insulating layer 13 and first insulating layer 12 and is through to the sensing electrode 111
Through-hole H；
It is realized it should be noted that step F4 and step F5 is combinable in same step, can also be different at two so
It is formed in step.
The first transmission electrode S11 and second that the first control switch 113 is formed in F45: Yu Suoshu second insulating layer 13 is passed
Transmission pole S12, the first transmission electrode S21 and the second transmission electrode S22 for forming the second control switch 115, and described second passes
Transmission pole S12 and the second transmission electrode S22 is full of the through-hole H, is connected with being separately connected the sensing electrode 111.
The first transmission electrode S11 and the second transmission electrode S12 is located at the two sides of the active layer 14, and described first passes
Transmission pole S21 and the second transmission electrode S22 is located at the two sides of the active layer 15, to form first control switch 113
With second control switch 115.
In the present embodiment, the second transmission electrode S12 of first control switch 113 and second control switch
115 the second transmission electrode S22 passes through a through-hole H respectively and connect with the sensing electrode 111.So, in other embodiments,
Second transmission electrode S12 of first control switch 113 in same sensing unit 11 and second control switch 115
Second transmission electrode S22 can be connect by same through-hole H with the sensing electrode 111.
In step F5: Yu Suoshu second insulating layer 13, the first transmission electrode S11, active layer 14, the second transmission electrode S12,
First transmission electrode S21, active layer 15 form the passivation layer 16 on second transmission electrode S22.
The first control switch 113 and the second control switch 115 formed in above-mentioned production method is mainly bottom gate type
(Bottom-Gate) thin film transistor (TFT), so, first control switch 113 and the second control switch 115 can also be top gate type
(Top-Gate) thin film transistor (TFT), such as low-temperature polysilicon film transistor.
It should be further noted that the multiple scan line group B, multiple data line group D, the first reference signal line
R1, first control switch 113, second control switch 115 connection cabling finally such as by mode via hole with
Around being formed on the second surface A2 of the insulating substrate 2a be routed (not indicating) be connected, with driving circuit 20 above-mentioned
Or corresponding circuit carries out signal transmission in aftermentioned control chip 3.
Optionally, the biometric information sensor 2 further comprises the scan drive circuit 21, the choosing of the multiple data
Select device 241, the second reference signal line R2 and the sensing signal line L.The scan drive circuit 21, the multiple number
The second of the insulating substrate 2a is formed according to selector 241, the second reference signal line R2 and the sensing signal line L
In surface A 2.
The scan drive circuit 21, the multiple data selector 241, the second reference signal line R2 and described
Sensing signal line L is arranged in around the multiple sensing unit 11.
The selection of the first choice switch S1 of the data selector 241 and second switch S2 is for example also thin film transistor (TFT)
Switch.The scan drive circuit 21 generally comprises multiple control switch (not shown), and the multiple control switch is, for example,
Thin film transistor switch.Correspondingly, the multiple data selector 241 and the scan drive circuit 21 are in first control
When switch 113 and second control switch 115 formation, formed together by the same or similar manufacture craft, to improve
The integrated level of biometric information sensor 2, and reduce cost of manufacture.
In some embodiments, the biological 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 the sensing driving circuit 22.That is, driving circuit above-mentioned
A part of circuit in 20 is formed in control chip 3, and a part is formed on biometric information sensor 2, so set, a side
The integrated level of biological information sensing device 1 is improved in face, reduces the volume of the biological information sensing device 1, in addition, can also reduce
The manufacturing cost of biological information sensing device 1.
Optionally, the biometric information sensor 2 and the control chip 3 are for example respectively bare die (Die), the control
Chip 3 is for example arranged on the insulating substrate 2a by flip technique (Flip-Chip).When the insulating substrate 2a is, for example,
When glass substrate, the control chip 3 is for example bound by the mode of chip on glass (Chip On Glass, COG)
(Bonding) on the glass substrate.When the insulating 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
Other suitable techniques can be used to be formed on the insulating substrate 2a, be not limited to flip technique described herein.
When on the insulating substrate 2a that the biometric information sensor is arranged in the control chip 3 and then by the control
Coremaking piece 3 and the biometric information sensor 1 are placed in a mold, and forming packaging body by injection molding (Molding) technique, (figure is not
Show) on the biometric information sensor 2 and the control chip 3, to be formed as a chip (Chip).The packaging body example
For example epoxide resin material is made, but is not limited to the epoxide resin material, can also be other suitable materials.
After the biological information sensing device 1 formation, the first surface A1 of the insulating substrate 2a is for receiving target
Object approaches or touches input, in other words, when user is using the biological information sensing device 1 sensing biological information, institute
First surface A1 is stated compared to the second surface A2 more adjacent objects object.
In other embodiments, the scan drive circuit 21, the data selection circuit 24, described second are with reference to letter
Number line R2 and sensing signal line L non-can also be arranged on the insulating substrate 2a.Such as 21 He of scan drive circuit
The data selection circuit 24 may also be arranged in the control chip 3, alternatively, be arranged in other chip, or, with
There are also possible for circuit mode except chip.
Referring to Fig. 9, Fig. 9 is the structural schematic diagram of the another embodiment of biological information sensing device of the present invention.The life
Object information sensor 1 further comprises connector 4, and the connector 4 is believed for connecting the control chip 3 with the biology
Cease sensor 2.The connector 4 is, for example, flexible circuit board (Flexible Printed Circuit Board, FPCB).Institute
It states control chip 3 to be for example arranged on the flexible circuit board 4, and is passed by the flexible circuit board 4 with the biological information
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), alternatively, the biometric information sensor 2 is bare die, the control chip 3 is chip, alternatively, the biological information passes
Sensor 2 and the control chip 3 are bare die.
In the respective embodiments described above, when the biometric information sensor 2 is bare die or chip, by the way that the data are arranged
Selection circuit 24 controls timesharing output drive signal to the sensing electrode 111 with a line to correspond to.Since the data select electricity
The Single port (not shown) being connected with the sensing driving circuit 22, institute is respectively set in each data selector 241 on road 24
It states port and is used for transmission pumping signal or sensing signal, correspondingly, each port setting is corresponded on the biometric information sensor 2
One connection pin (not shown), to connect the port and the sensing driving circuit 22.So, it is possible to reduce biological information
The quantity of connection pin between sensor 2 and control chip 3.
Ground is changed, in other embodiments, for example, the biometric information sensor 2 can also be to be formed in display screen
In or display screen on, and be not integrated into a bare die or a chip.Be formed in display screen when the biometric information sensor 2 or
When on display screen, the control chip 3 can drive a line sensing electrode 111 to execute biological information sensing simultaneously.
Referring to Fig. 10, Figure 10 is the structural schematic diagram of another embodiment of sensing unit of the present invention.The sensing unit
11 include 2 second control switches 115 that 2 first be connected in parallel control switches 113 and are connected in parallel.
Figure 11 is please referred to, Figure 11 is the structural schematic diagram of the another embodiment of biological information sensing device of the present invention.Institute
It states between driving circuit 20 and each sensing electrode 111 respectively by an individual data line L1 connection, omits the first control switch
113 and second control switch 115.Correspondingly, the driving circuit 20 by exporting corresponding signal to each sensing electrode respectively
111 be also feasible.
Figure 12 is please referred to, Figure 12 is the structural schematic diagram of an embodiment of electronic equipment of the present invention.The electronic equipment 9
Including biological information sensing device 1 described in any of the above-described embodiment.The electronic equipment 9 is, for example, that portable electronic produces
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
The for example suitable mobile terminal such as mobile phone, tablet computer, laptop, wearable product.The household formula electronic product example
The for example 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, automobile data recorder, navigator, car refrigerator.
By taking the electronic equipment 9 is mobile phone as an example, the mobile phone is for example being arranged in just in the biological information sensing device 1
Any appropriate position such as face, side, the back side, in addition, the biological 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 front of mobile phone is arranged in the biological information sensing device 1.
According to the biological information that the biological information sensing device 1 is sensed, the electronic equipment 9 for example carries out user
Identification authentication, on-line payment, quick start application program (APP) etc..
Since the electronic equipment 9 includes the biological information sensing device 1, the sense of the biological information sensing device 1
It is higher to survey precision, therefore, the better user experience of the electronic equipment 9.
Figure 13 is please referred to, Figure 13 is the circuit block diagram of one embodiment of electronic equipment shown in Figure 12.The electronic equipment 9
It further comprise main control chip 5.The main control chip 5 is connect with the biological information sensing device 1, for believing with the biology
It ceases sensing device 1 and carries out data communication.The main control chip 5 is, for example, one chip or chipset.When main control chip 5 is chip
When group, the chipset includes application processor (Application Processor, AP) and power supply chip.In addition, the core
Piece group can further comprise storage chip.When main control chip 5 is one chip, the main control chip 5 is, for example, application processing
Device.Further, the application processor also can be replaced central processing unit (Central Processing Unit, CPU).
The main control chip 5 includes ground terminal 50, and the ground terminal 50 with connecting equipment, believe by the ground connection on receiving device ground
Number, ground signalling is indicated in Fig. 9 with GND.It is also known as to the equipment systematically, for example, the power supply of electronic equipment 9 is negative
Pole, power supply for example battery.The ground signalling GND is also known as system ground voltage, system earth signal, equipment ground voltage or sets
Standby earth signal etc..The ground signalling GND is constant voltage, described as the voltage reference of each circuit in electronic equipment 9
Ground signalling GND is, for example, the voltage signals such as 0V (volt), 2V, (- 1) V.In general, the equipment not earth ground or absolutely
Greatly.It so, may also be the equipment earth ground when electronic equipment 9 is connect by conductor with earth ground.
In each embodiment above-mentioned, the biological information sensing device 1 be can be using a domain as voltage reference.
The domain is the domain on the basis of ground signalling GND.The ground signalling GND is as each circuit in biological information sensing device 1
Voltage reference.
For the signal-to-noise ratio of the sensing signal of raising biological information sensing device 1, skill is modulated present invention further propose that utilizing
Art scheme improves the technical purpose of signal-to-noise ratio to reach, and the modulation technique scheme is suitable for life described in the respective embodiments described above
Object information sensor 1.
For example, being exported to reach uniform modulation to the signal of sensing unit 11 by the technical solution on modulation ground.
Specifically, the driving circuit 20 for example further comprises the first ground terminal 31, the second ground terminal 32, modulation circuit
33 and voltage generation circuit 34.The modulation circuit 33 be connected to first ground terminal 31 and second ground terminal 32 it
Between.The modulation circuit 33 is further connected with the voltage generation circuit 34.First ground terminal 31 is connected to equipment
Ground.The voltage generation circuit 34 is for providing a voltage drive signals to the modulation circuit 33.The modulation circuit 33
It is corresponded to according to the ground signalling GND of the voltage drive signals and the equipment ground and generates modulated signal MGND to described second
Ground terminal 32.The modulated signal MGND is for the output of driving circuit 20 described in uniform modulation to the letter on the sensing unit 11
Number, for example, first reference signal, second reference signal, the pumping signal, the scanning open signal and institute
State scanning pick-off signal.Wherein, the ground (for example, second ground terminal 32) of the modulated signal MGND is loaded as modulation ground.
For example, the pumping signal includes first voltage signal and second voltage signal.The pumping signal is the first electricity
The square-wave pulse signal for pressing signal and second voltage signal alternately to change.Wherein, the first voltage signal is lower than described second
Voltage signal, the first voltage signal are, for example, ground signalling GND.The modulated signal MGND is for raising second electricity
Signal is pressed, to improve the signal-to-noise ratio of sensing signal.
When the driving circuit 20 is received from the sensing signal that sensing electrode 111 exports, need to sensing signal
Back-modulation is carried out, to obtain corresponding biological information.
In this embodiment, the biological information sensing device 1 is using two domains as voltage reference.Two domains point
It is not shown as the domain 60 on the basis of ground signalling GND and the domain on the basis of modulated signal MGND 70.Wherein, to be grounded letter
The ground terminal of the circuit in domain 60 on the basis of number GND with being directly connected to equipment, domain on the basis of by modulated signal MGND
The ground terminal of circuit in 70 is directly connected to modulation ground.Further, for being to modulate the circuit on ground, with reference to ground electricity
The modulated signal MGND that position is loaded for modulation ground；For with equipment for ground circuit, ground reference for equipment institute
The ground signalling GND of load.
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 are for example arranged in domain 70.The sensing driving 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 generate 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 practical need
It wants, such as circuit conditions are different, it is corresponding to do different adjustment etc..
The biological information sensing device 1 can further comprise ground line G, and the ground line G surrounds the multiple sensing
Unit 11 be arranged, in some embodiments, the ground line G be it is latticed, be located on the same floor with the sensing electrode 111,
It is arranged respectively around the sensing electrode 111.Ground is changed, the ground line G can also be in the multiple sensing unit 11
One circle of periphery setting etc. is also possible.
In addition, being to be grounded letter when the biological information sensing device 1 is by voltage reference, the domain of a domain
When domain on the basis of number GND, first reference signal and/or second reference signal are, for example, the relatively described ground signalling
GND is constant voltage signal.So, when the biological information sensing device 1 is with two domains 60 and 70 for voltage reference
When, first reference signal and/or the second reference signal for example, relatively described ground signalling GND are the voltage changed
Signal, the relatively described modulated signal MGND are constant voltage signal.
Further, in addition to modulation power source end or reference can also be used above by the technical solution using modulation ground
The power supply voltage signal of power supply carrys out the output of driving circuit 20 described in uniform modulation to the signal of the multiple sensing unit 11.
It should be further noted that can be subtracted by the way that first control switch 113 and the second control switch 115 is arranged
The pin that few sensing unit 11 is connected with peripheral circuit (for example, sensing driving circuit 22, reference signal generation circuit 23).
Although embodiment has been described about specific configuration and operation sequence here, it should be appreciated that, it replaces
The embodiment in generation can increase, omit or change element, operation etc..Therefore, embodiment disclosed herein is meant to be real
It applies example rather than limits.
Claims (18)
1. a kind of capacitance-type sensing device, comprising:
Multiple sensing units, each sensing unit include:
Sensing electrode；
First control switch is connect with the sensing electrode；With
Second control switch is connect with the sensing electrode；With
Driving circuit is separately connected, for controlling with the first control switch of the multiple sensing unit and the second control switch
First control switch and the second control switch timesharing conducting in same sensing unit, and pass through the transmission of the first control switch of conducting
Pumping signal executes sensing operation to sensing electrode, transmits one first reference signal to sensing by the second control switch of conducting
Electrode；For same row sensing electrode:
When the first control switch conducting in driving circuit driving wherein a sensing unit, the second control switch are ended,
Some or all of drive in remaining sensing unit the cut-off of the first control switch, the conducting of the second control switch of sensing unit；
The driving circuit provides the pumping signal by the first control switch of conducting and executes sensing operation to sensing electrode,
And the sensing signal exported from sensing electrode is received, to execute the sensing operation of self-capacitance；
The driving circuit includes scan drive circuit, sensing driving circuit and reference signal generation circuit, wherein described to sweep
Driving circuit is retouched for driving the conducting and cut-off of first control switch Yu second control switch, the sensing driving
Circuit is used to drive sensing electrode to execute sensing operation by the first control switch of conducting, and the reference signal generation circuit is used
The second reference signal is provided to sensing electrode in the second control switch by conducting；
When the scan drive circuit drives the first control switch of a line sensing unit to be connected, the second control switch is ended,
The sensing driving circuit provides the pumping signal by the first control switch of conducting simultaneously and executes to section senses electrode
Sensing operation, the first control switch that the reference signal generation circuit further passes through conducting provide same second reference signal
To the sensing electrode of sensing unit some or all of in remaining sensing unit；
For the sensing electrode of same a line: drive part sensing electrode executes sensing operation to the driving circuit simultaneously every time, leads to
Repeatedly driving is crossed, until having driven a line sensing electrode to execute sensing operation；
The capacitance-type sensing device further comprises control unit, and the driving circuit further comprises multiple data selections
Device, described control unit are separately connected with the scan drive circuit and the multiple data selector, for controlling described sweep
The conducting timing of the first control switch and the second control switch that driving circuit drives in each row sensing unit is retouched, and passes through control
The multiple data selector is made to control and export the pumping signal and second reference signal to the timing of sensing electrode；
The multiple data selector connects the reference signal generation circuit and the sensing driving circuit, each data selection
Device further passes through the sensing electrode of the first control switch coupling part sensing unit, and the data selector is for selecting output
The pumping signal or second reference signal are to sensing electrode；
The driving circuit once exports the pumping signal by each data selector simultaneously and a sensing electrode is given to execute respectively
Sensing operation, and second reference signal is exported to in remaining sensing electrode of a line by each data selector respectively
Part or all of sensing electrode；
The capacitance-type sensing device further comprises:
Multiple scan line groups, the scan line group include the first scan line and the second scan line；With
Multiple data line groups, the data line group include the first data line and the second data line；
Every scan line group connects a line sensing unit, and each data line group connects a column sensing unit；
First control switch includes coordination electrode, the first transmission electrode and the second transmission electrode；Second control switch
Including coordination electrode, the first transmission electrode and the second transmission electrode；First scan line connect the scan drive circuit and
The coordination electrode of first control switch；Second scan line connects the scan drive circuit and second control is opened
The coordination electrode of pass；First data line connects the first transmission electrode of the data selector and the first control switch；Institute
State the first transmission electrode that the second data line connects the reference signal generation circuit and the second control switch；First control
Second transmission electrode of switch connects the sensing electrode；Second transmission electrode of second control switch connects the sensing
Electrode；
First data line is used for transmission the pumping signal and second reference signal, and second data line is for passing
Defeated first reference signal, the scan drive circuit are provided scanning and are opened by first scan line, the second scan line
Signal gives the first control switch and the second control switch, to control the first control switch and the conducting of the second control switch, passes through institute
State the first scan line, the second scan line provides scanning pick-off signal to the first control switch and the second control switch, to control the
One control switch and the cut-off of the second control switch；
The capacitance-type sensing device further comprises:
First reference signal line connects the reference signal generation circuit and the second data line, is used for transmission first reference
Signal；
Second reference signal line connects the reference signal generation circuit and the multiple data selector, is used for transmission described
Second reference signal；With
Sensing signal line connects the sensing driving circuit and the multiple data selector, is used for transmission the pumping signal
Sensing driving circuit is given to sensing electrode and sensing signal of the transmission from sensing electrode；
Each data selector includes multiple switch unit, and each switch unit includes that first choice switch and the second selection are opened
It closes, the first choice switch includes coordination electrode, the first transmission electrode and the second transmission electrode, the second selection switch
Including coordination electrode, the first transmission electrode and the second transmission electrode, wherein the coordination electrode of first choice switch and the
The coordination electrode of two selection switches is separately connected with described control unit, the first transmission electrode of the first choice switch and institute
Sensing driving circuit connection is stated, the first transmission electrode of the second selection switch is connect with the reference signal generation circuit,
Second transmission electrode of the first choice switch is connected and is connected to the second transmission electrode of the second selection switch
First data line；
Described control unit controls the switch of the first choice in same switch unit and the second selection switch timesharing conducting；
Wherein, the pressure difference between first reference signal and the pumping signal remains unchanged；Second reference signal with
Pressure difference between the pumping signal remains unchanged.
2. capacitance-type sensing device according to claim 1, it is characterised in that: first reference signal and the excitation
Signal is identical.
3. capacitance-type sensing device according to claim 1, it is characterised in that: second reference signal and described first
Reference signal is identical.
4. capacitance-type sensing device according to claim 1, it is characterised in that: the capacitance-type sensing device includes capacitor
Formula sensor, the capacitance type sensor include insulating substrate, the multiple sensing unit, the multiple scan line group, institute
State multiple data line groups and first reference signal line, the multiple sensing unit, the multiple scan line group, institute
It states multiple data line groups and first reference signal line is formed on the insulating substrate.
5. capacitance-type sensing device according to claim 4, it is characterised in that: the first control in each sensing unit
Switch and the second control switch are thin film transistor switch, and the insulating substrate is glass substrate.
6. capacitance-type sensing device according to claim 1, it is characterised in that: the sensing unit includes one first control
Switch and one second control switch, or, the sensing unit includes 2 first control switches being connected in parallel and is connected in parallel
2 second control switches.
7. capacitance-type sensing device according to claim 4, it is characterised in that: the insulating substrate include first surface and
The second surface being oppositely arranged with first surface, the first surface are used to receive the touch or close input of target object, institute
State multiple sensing units, the multiple scan line group, the multiple data line group and first reference signal line setting
In the second surface.
8. capacitance-type sensing device according to claim 7, it is characterised in that: the sensing electrode of the multiple sensing unit
Compared to first control switch, second control switch, the multiple scan line group and the multiple data line-group
Group is closer to the second surface.
9. capacitance-type sensing device according to claim 7, it is characterised in that: first control switch, described second
Control switch, the multiple scan line group and the multiple data line group are located at the sensing electricity of the multiple sensing unit
Pole is back to the side of the insulating substrate.
10. capacitance-type sensing device according to claim 7, it is characterised in that: the sensing electricity of the multiple sensing unit
Pole covers first control switch, second control switch, the multiple scan line group and the multiple data line-group
Group.
11. capacitance-type sensing device according to claim 7, it is characterised in that: the capacitance type sensor further wraps
Include the scan drive circuit, the multiple data selector, second reference signal line and the sensing signal line, institute
It states scan drive circuit, the multiple data selector, second reference signal line and the sensing signal line and is formed in institute
It states on the second surface of insulating substrate.
12. capacitance-type sensing device according to claim 11, it is characterised in that: the scan drive circuit, described more
A data selector, second reference signal line and the sensing signal line are arranged in around the multiple sensing unit.
13. capacitance-type sensing device according to claim 11, it is characterised in that: the scan drive circuit and described more
A data selector includes control switch, and the control switch is thin film transistor switch.
14. capacitance-type sensing device according to claim 7, it is characterised in that: the capacitance type sensor further wraps
Passivation layer is included, the multiple sensing unit, the multiple scan line group, the multiple data line group and described are formed in
On first reference signal line.
15. capacitance-type sensing device according to claim 14, it is characterised in that: the capacitance-type sensing device is further
Including controlling chip, the control chip includes described control unit, the reference signal generation circuit and sensing driving
Circuit.
16. capacitance-type sensing device according to claim 15, it is characterised in that: the capacitance type sensor and the control
Coremaking piece is respectively bare die, and the control chip bonding is on the insulating substrate；Alternatively, the control chip setting is soft one
On property circuit board, it is electrically connected by the flexible circuit board with the capacitance type sensor.
17. capacitance-type sensing device according to claim 1, it is characterised in that: the capacitance-type sensing device is fingerprint
Sensing device.
18. a kind of electronic equipment, including capacitance-type sensing device described in any one of claim 1-17.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/094245 WO2018027594A1 (en) | 2016-08-09 | 2016-08-09 | Capacitive sensing device and electronic apparatus |
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| CN106462308B true CN106462308B (en) | 2019-11-29 |
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| WO2018027593A1 (en) * | 2016-08-09 | 2018-02-15 | 深圳信炜科技有限公司 | Biometric information sensing device and electronic apparatus |
| CN106537315B (en) * | 2016-08-09 | 2019-11-29 | 深圳信炜科技有限公司 | Capacitance type sensor, capacitance-type sensing device and electronic equipment |
| CN106462308B (en) * | 2016-08-09 | 2019-11-29 | 深圳信炜科技有限公司 | Capacitance-type sensing device and electronic equipment |
| CN106537414A (en) * | 2016-08-09 | 2017-03-22 | 深圳信炜科技有限公司 | Sensor, sensing device and electronic equipment |
| CN106415465B (en) * | 2016-08-09 | 2020-04-07 | 深圳信炜科技有限公司 | Method for manufacturing capacitive sensor and method for manufacturing capacitive sensing device |
| WO2018027592A1 (en) * | 2016-08-09 | 2018-02-15 | 深圳信炜科技有限公司 | Biometric information sensing device and electronic apparatus |
| WO2018027595A1 (en) * | 2016-08-09 | 2018-02-15 | 深圳信炜科技有限公司 | Capacitive sensor, capacitive sensing device, and electronic apparatus |
| CN113567752B (en) * | 2021-07-22 | 2024-04-23 | 之江实验室 | High-dynamic array type capacitance measuring circuit facing tactile perception and measuring method thereof |
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| CN106462308A (en) | 2017-02-22 |
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