CN209460750U - Detection unit, capacitance-type sensing device and electronic equipment - Google Patents
Detection unit, capacitance-type sensing device and electronic equipment Download PDFInfo
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- CN209460750U CN209460750U CN201790000087.XU CN201790000087U CN209460750U CN 209460750 U CN209460750 U CN 209460750U CN 201790000087 U CN201790000087 U CN 201790000087U CN 209460750 U CN209460750 U CN 209460750U
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
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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
Abstract
The utility model discloses a kind of detection unit, capacitance-type sensing device and electronic equipments.The detection unit with a sensor unit for connecting.The sensor unit includes a plurality of first electrode and a plurality of second electrode.The a plurality of first electrode and the insulation cross arrangement of a plurality of second electrode.The detection unit includes: multiple first switches；Reference circuit is connect with a plurality of first electrode by the multiple first switches of institute, provides a scheduled reference voltage signal to a plurality of first electrode；Signal read circuits for providing pumping signal to a plurality of second electrode, and receive the sensing signal exported from second electrode；And control circuit.When the detection unit drives the sensor unit to execute sensing operation, the control circuit is successively disconnected by controlling the multiple first switch, successively hanging to control a plurality of first electrode.The capacitance-type sensing device includes the detection unit.The electronic equipment includes the capacitance-type sensing device.
Description
Technical field
The utility model relates to capacitive sensing technical field more particularly to a kind of detection units, capacitance-type sensing device
And electronic equipment.
Background technique
Currently, capacitance-type sensing device is using relatively broad, for example, capacitance-type sensing device is used for touch detection, fingerprint
The fields such as identification.So, the cost of capacitance-type sensing device is still higher.
Utility model content
The utility model embodiment aims to solve at least one of the technical problems existing in the prior art.For this purpose, this reality
Need to provide a kind of detection unit, capacitance-type sensing device and electronic equipment with novel embodiment.
The utility model provides a kind of detection unit, and for connecting with a sensor unit, the sensor unit includes
A plurality of first electrode and a plurality of second electrode, a plurality of first electrode and a plurality of second electrode insulation cross arrangement,
In, a plurality of first electrode is located above a plurality of second electrode, and a plurality of first electrode is back to described a plurality of the
The side of two electrodes be used to receive target object close to input；The detection unit includes:
Multiple first switches；
Reference circuit is connect, for providing one with a plurality of first electrode alternative by the multiple first switches of institute
Scheduled reference voltage signal gives a plurality of first electrode；
Signal read circuits for providing a pumping signal to a plurality of second electrode, and receive and come from second electrode
The sensing signal of output；With
Control circuit；
When the detection unit drives the sensor unit to execute sensing operation, the control circuit passes through control institute
Multiple first switches are stated successively to disconnect, it is successively hanging to control a plurality of first electrode.
In some embodiments, first switch described in the every secondary control one of the control circuit disconnects, control remaining the
One closes the switch.
In some embodiments, the first electrode connecting with the first switch of closure is received from the reference circuit
Scheduled reference voltage signal.
In some embodiments, the detection unit further comprises multiple second switches and multiple signal-obtainings
Circuit, the multiple signal read circuits are connect by the multiple second switch with a plurality of second electrode, the control
Whether circuit is used to control the shutdown of the multiple second switch.
In some embodiments, of the number of the multiple signal read circuits less than the multiple second switch
Number, wherein all or part of signal read circuits connect at least two second switches.
In some embodiments, the signal read circuits being connected at least two second switches drive for timesharing and institute
State the second electrode that at least two second switches are connected.
In some embodiments, the detection unit is further connect with a modulation unit, for receiving the modulation
The modulated signal of unit output, the pumping signal is to modulate through the modulated signal with the scheduled reference voltage signal
Signal afterwards.
In some embodiments, the signal of the detection unit is the letter after the modulated signal synchronous modulation
Number.
In some embodiments, the signal read circuits include amplifier and feedback branch, and the amplifier includes
In-phase end, reverse side, output end and ground terminal, wherein the feedback branch is connected between the reverse side and output end,
The reverse side is further used for connecting with second electrode, and the in-phase end is for receiving the pumping signal, the ground terminal
For receiving the modulated signal.
In some embodiments, the detection unit is integrated in a sensor chip.
In some embodiments, the detection unit for drive the sensor unit execute touch-sensing and/or
Biological information sensing.
In some embodiments, the detection unit is for driving the sensor unit to execute fingerprint sensing.
The utility model also provides a kind of capacitance-type sensing device, including the detection unit described in any one of above-mentioned.
The utility model also provides a kind of electronic equipment, including the capacitance-type sensing device.
Since the detection unit of the application can drive the sensor unit to execute sensing operation, wherein the sensing
Device unit includes a plurality of first electrode and a plurality of second electrode, and a plurality of first electrode and described a plurality of second
Electrode insulation intersects, therefore, described for the sensor unit compared to the existing rectangular block shape electrode coplanar with same layer
The output pin that detection unit is connect with the sensor unit tails off, so as to reduce the manufacturing cost of detection unit.Phase
The cost of Ying Di, capacitance-type sensing device and electronic equipment including the detection unit reduce.In addition, can also be conducive to described
Detection unit and capacitance-type sensing device are towards miniaturization.
The additional aspect and advantage of the utility model embodiment will be set forth in part in the description, partially will be under
Become obvious in the description in face, or is recognized by the practice of the utility model embodiment.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the utility model embodiment are from combination following accompanying drawings to embodiment
Description in will be apparent and be readily appreciated that, in which:
Fig. 1 is a kind of structural schematic diagram of existing capacitance-type sensing device；
Fig. 2 is the circuit block diagram of the capacitance-type sensing device of the utility model embodiment；
Fig. 3 is the structural schematic diagram of one embodiment of sensor unit in Fig. 2；
Fig. 4 is the structural schematic diagram of another embodiment of sensor unit in Fig. 2；
Fig. 5 is the schematic cross-section of the capacitance-type sensing device of the utility model embodiment；
Fig. 6 is that first electrode and second electrode and detection are single in the capacitance-type sensing device of the utility model embodiment
Member, the attachment structure schematic diagram of modulation unit；
Fig. 7 is that the first electrode and second electrode in the capacitance-type sensing device of the utility model embodiment correspond to and join
Examine the attachment structure schematic diagram of circuit and signal read circuits；
Fig. 8 is the capacitance-type sensing device of the utility model embodiment in the equivalent circuit signal for executing capacitance sensing
Figure；
Fig. 9 is the floor map of the electronic equipment of the utility model embodiment.
Specific embodiment
The embodiments of the present invention is described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein
Same or similar label indicates same or similar element or element with the same or similar functions from beginning to end.Lead to below
It crosses the embodiment being described with reference to the drawings to be exemplary, is only used for explaining the utility model, and should not be understood as practical to this
Novel limitation.
In the description of the present invention, it should be understood that term " first ", " second " are used for description purposes only, and
It cannot be understood as indicating or implying relative importance or implicitly indicate the quantity of indicated technical characteristic.It defines as a result,
The feature of " first ", " second " can explicitly or implicitly include one or more feature.In the utility model
Description in, the meaning of " plurality " is two or more, unless otherwise specifically defined.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected or can be in communication with each other；It can be directly connected, it can also be in
Between medium be indirectly connected, can be the connection inside two elements or the interaction relationship of two elements.For this field
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
Following disclosure provides many different embodiments or example is used to realize the different structure of the utility model.
In order to simplify the disclosure of the utility model, hereinafter to the component of specific examples and being set for describing.Certainly, they are only
Example, and purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals
And/or reference letter, this repetition are for purposes of simplicity and clarity, itself not indicate discussed various embodiments
And/or the relationship between setting.In addition, the example of various specific techniques and material that the utility model provides, but this
Field those of ordinary skill can be appreciated that the application of other techniques and/or the use of other materials.
Further, described feature, structure can be incorporated in one or more embodiment party in any suitable manner
In formula.In the following description, many details are provided to provide and fully understand to the embodiments of the present invention.
However, one of ordinary skill in the art would recognize that, without one or more in the specific detail, or using other knots
Structure, constituent element etc. can also practice the technical solution of the utility model.In other cases, it is not shown in detail or describes known knot
Structure or operation are to avoid fuzzy the utility model.
Referring to Fig. 1, Fig. 1 is a kind of existing structural schematic diagram of capacitance-type sensing device.The capacitive sensing dress
Setting 100 includes substrate 10, multiple sensing electrodes 12 and detection circuit 16.The multiple sensing electrode 12 is formed in the substrate
On 10, and the multiple sensing electrode 12 is arranged in two-dimensional array type, that is, forms sensor array 14.The multiple sensing electrode 12
Same layer is coplanar, and each sensing electrode 12 forms a sensor pixel point.The detection circuit 16 is formed on the substrate 10, and institute is located at
State the periphery of sensor array 14.The detection circuit 16 is electrically connected with each sensing electrode 12, for provide pumping signal to
Each sensing electrode 12 drives each sensing electrode 12 to execute sensing operation.Further, the detection circuit 16, which receives, carrys out self-inductance measurement
The sensing signal that electrode 12 exports, and sensitive information is obtained according to the sensing signal.
The capacitance-type sensing device 100 for example can but be not limited to execute touch detection, and/or, execute biological information
Detection, for example, the capacitance-type sensing device 100 is used to detect the lines information of the organisms such as fingerprint, palmmprint, ear line.It is described
Organism is, for example, human body but is not limited to human body, can also be other suitable organisms.
However, since the detection circuit 16 and each sensing electrode 12 are for example electrically connected by conducting wire one by one,
If the quantity of sensing electrode 12 is more, biggish difficulty will be increased to the arrangement of conducting wire, to increase capacitive sensing dress
Set 100 cost of manufacture.In addition, must have certain interval between conducting wire and conducting wire, therefore arrange to meet electrical requirements
Conducting wire it is more, the size of capacitance-type sensing device 100 is bigger, to guarantee the yield of capacitance-type sensing device 100, thus unfavorable
In the miniaturization of capacitance-type sensing device 100.
In particular, when the biological information sensing mould group or image sense that the capacitance-type sensing device 100 is, for example, small size
When surveying mould group, above-mentioned technical problem is more prominent.Generally, the biological information sensing mould group or image sensing mould group of small size
It is arranged on the non-display area of such as mobile terminal, for example, being located at position, the back side and side positioned at mobile terminal of Home key
Face etc..So, ground is changed, the biological information sensing mould group or image sensing mould group may also be arranged on the aobvious of such as mobile terminal
Show area.Wherein, viewing area is the region that mobile terminal shows image.
It is at least to solve one of above-mentioned technical problem, the utility model proposes a kind of new capacitance-type sensing devices 200.Please
It is together the circuit block diagram of the capacitance-type sensing device 200 of the utility model refering to Fig. 2 and Fig. 3, Fig. 2, Fig. 3 is electricity shown in Fig. 2
The structural schematic diagram of one embodiment of the sensor unit of appearance formula sensing device 200.The capacitance-type sensing device 200 can be used
In execute biological information sensing, any one or a few in the functions such as touch-sensing.The capacitance-type sensing device 200 includes
Sensor unit 22, detection unit 24 and modulation unit 26.
The sensor unit 22 includes a plurality of first electrode 222 and a plurality of second electrode 224.The a plurality of first electrode
222 and a plurality of second electrode 224 insulate cross arrangement.
The modulation unit 26 is for generating modulated signal M.
The detection unit 24 provides a pumping signal Vref to described more for receiving the modulated signal M, and passing through
Second electrode 224, successively to control a plurality of first electrode 222 hanging and provide a scheduled reference voltage signal Vp
To not hanging first electrode 222, to drive the sensor unit 22 to execute sensing operation.
Wherein, the pumping signal Vref is to pass through the modulated signal of modulated signal M.
Since the capacitance-type sensing device 200 of the application includes a plurality of first electrode 222 and a plurality of second electricity
Pole 224, and a plurality of first electrode 222 and a plurality of second electrode 224 insulation intersect, each infall is then correspondingly formed
Sensor pixel point, therefore, compared to above-mentioned existing capacitance-type sensing device, the capacitance-type sensing device of the application is guaranteeing
In the case that sensor pixel point is enough, a plurality of first electrode 222 and a plurality of second electrode 224 are connected to detection list
The quantity of the conducting wire of member 24 is reduced, thus, the cost of capacitance-type sensing device 200 can be reduced.
Further, since number of conductors is reduced, the capacitance-type sensing device 200 can also be conducive to towards miniaturization.
In addition, since the pumping signal Vref is to pass through the modulated signal of modulated signal M, Ke Yiti
The signal-to-noise ratio of the high capacitance-type sensing device 200, and then improve the sensing precision of the capacitance-type sensing device 200.
In some embodiments, the pumping signal Vref changes with the variation of the modulated signal M.For example, institute
Pumping signal Vref is stated to increase with the raising of the modulated signal M, reduce with the reduction of the modulated signal M.
The detection unit 24 further receives the sensing signal Vd exported from second electrode 224, to obtain sensing letter
Breath.The scheduled reference voltage signal Vp is, for example, to pass through the modulated signal of modulated signal M.
The a plurality of first electrode 222 for being coupled to target object in a capacitive manner.The capacitance-type sensing device 200
For sensing the touch for whether having the target object, and/or, sense the biological information of the target object.The life
Object characteristic information is, for example, the suitable lines information on the organisms such as finger print information, palm print information, ear line information.The object
Body corresponding for example, finger, palm, ear etc..
The detection unit 24 is come by disconnecting the connection with first electrode 222 so that the first electrode 222 is hanging.
When the detection unit 24 is when disconnecting the connection with a first electrode 222, with the first electrode 222 disconnected before
Re-start electrical connection.
In some embodiments, a plurality of first electrode 222 is alternatively arranged along first direction, and every first electrode
222 extend in a second direction.The a plurality of second electrode 224 is alternatively arranged in a second direction, and every second electrode 224 is along
One direction extends.The first direction is different from the second direction.The first direction and second direction for example but are not limited to
In vertical relation.As shown in figure 3, in the present embodiment, the first electrode 222 is used as row electrode, successively arrange in the Y direction
Column, i.e. the 1st row, the 2nd row, the 3rd row ... m row, wherein m is the natural number greater than 1.The second electrode 224 is as column electricity
Pole is arranged successively in the X direction, i.e., the 1st column, the 2nd column, the 3rd the n-th column of column ..., wherein n is the natural number greater than 1.It is described more
Intersection region between first electrode 222 and a plurality of second electrode 224 forms the second coupled capacitor CF, the i.e. capacitive sensing
Device 200 can be formed with m*n the second coupled capacitor CF (see Fig. 6).Ground is changed, first direction and second direction for example may be used
To be a certain included angle setting, such as 45 °, 60 ° etc..In the present embodiment, a plurality of first electrode 222 and described a plurality of
Second electrode 224 is in rectangular strip, so, changes ground, a plurality of first electrode 222 and a plurality of second electrode 224
It can be in other suitable shapes, for example, bending strip etc..
Referring to Fig. 4, Fig. 4 is the structural schematic diagram of another embodiment of the sensor unit 22.Described a plurality of
One electrode 222 is alternatively arranged along first direction, and every first electrode 222 includes multiple first sub-electrode 222a and connects adjacent
The conducting wire 222b of first sub-electrode 222a.A plurality of second electrode 224 is alternatively arranged in a second direction, and every second electrode 224
Conducting wire 224b including multiple second sub electrode 224a and the adjacent second sub electrode 224a of connection.First direction and second direction are not
Together, for example, but it is not limited to vertical relation.As shown in figure 4, first electrode 222 is used as row electrode, successively arrange in the Y direction
Column, such as the 1st row, the 2nd row, the 7th row of the 3rd row ...；Second electrode 224 is used as column electrode, is arranged successively in the X direction, such as
1st column, the 2nd column, the 8th column of the 3rd column ....Intersection region between first electrode 222 and second electrode 224 forms the second coupling
Capacitor CF (see Fig. 6), therefore, sensor unit 22 shown in Fig. 4 can be formed with 7*8=56 the second coupled capacitor CF.It needs
Illustrate, number 56 herein is an example, and the number of actual product is all possible more or less than 56, and manufacturer can
It is correspondingly arranged according to product needs.Ground is changed, first direction and second direction can also for example be a certain included angle setting, example
For example 45 °, 60 ° etc..In the present embodiment, the first electrode 222 and second electrode 224 are rectangular block shape, so, the application
It is not limited thereto, the first electrode 222 and second electrode 224 can also be other suitable shapes.Compare shown in Fig. 3
The length of one electrode 222 and second electrode 224, first electrode 222 and second electrode 224 shown in Fig. 4 shortens.
It is understood that the structure of the structure of first electrode 222 and second electrode 224 can be in the respective embodiments described above
Multiple combinations and deformation are carried out, as long as first electrode 222 and second electrode 224 are arranged in a crossed manner in insulating.
Above-mentioned first electrode 222 and second electrode 224 can for example be made of transparent conductive material, the transparent conductive material
For example, tin indium oxide (ITO) material, indium zinc oxide (IZO) material etc..So, ground, the first electrode 222 and second are changed
Electrode 224 can also be made of other suitable conductive materials, for example, metal material, alloy material etc..Due to first electrode
222 and second electrode 224 be conductive electrode, therefore between first electrode 222 and second electrode 224 by setting insulation material
Material is electrically isolated.
Referring to Fig. 5, Fig. 5 is the schematic cross-section of the application capacitance-type sensing device 200.In some embodiments,
The sensor unit 22 can further comprise substrate 220 and insulating layer 226.The a plurality of second electrode 224 is arranged in substrate
On 220, insulating layer 226 is arranged in a plurality of second electrode 224, and a plurality of first electrode 222 is arranged on insulating layer 226.Wherein,
The a plurality of first electrode 222 back to the side of a plurality of second electrode 224 be used for receive user's finger in contact with or close to
Input.Region where defining first electrode 222 and second electrode 224 is sensing area I, defines and is located at sensing area I on substrate 220
The region of surrounding is non-sensing area II.Optionally, the detection unit 24 and modulation unit 26 are located at the non-sensing area of substrate 220
II.So, change ground, the detection unit 24 and modulation unit 26 can also for example, by the connectors such as flexible circuit circuit board with
The substrate 220 connects, and and non-limiting detection unit 24 and modulation unit 26 be arranged on substrate 220.
The substrate 220 is insulating substrate, for example, substrate of the suitable types such as glass substrate, film substrate.
In some embodiments, above-mentioned detection unit 24 is for example handled by silicon technology and is integrated in a sensor chip
In, above-mentioned modulation unit 26 is for example handled by silicon technology and is integrated in a control chip.Certainly, 24 He of detection unit
Modulation unit 26 is not limited yet and is integrated on a chips respectively, it is also contemplated that suitable situation and be integrated in several chips
On, such as two, three etc..The sensor chip and control chip for example by chip on glass (Chip On Glass,
COG the mode of mode or flip chip (Chip On Film, COF)) binds (Bonding) on substrate 220.The detection
Further such as being connected to external circuit by suitable connector flexible circuit board, (figure is not for unit 24 and modulation unit 26
Show).
Since the sensor unit 22 of the application is to form first electrode 222 and second electrode on insulating substrate 220
224, therefore, for forming the sensor unit of sensing electrode on a silicon substrate, the application includes the sensor list
The manufacturing cost of the capacitance-type sensing device 200 of member 22 further decreases.
In some embodiments, the modulation unit 26 for example exports modulated signal M the connecing to detection unit 24
Ground terminal c (see Fig. 8), the earth signal as detection unit 24.The earth signal corresponds to the signal of variation.Correspondingly, the inspection
The electric signal of unit 24 is surveyed using the earth signal of the variation as voltage basis of reference signal.It is described when local signal changes
Electric signal in detection unit 24 changes with the variation of the earth signal.To all signals of the detection unit 24
It is through the modulated signal of modulated signal M.
Ground is changed, in other embodiments, the modulation unit 26 can also export modulated signal M to detection unit
24 power end d (see Fig. 8) or reference power source end (not shown) etc., can also reach to all signals in detection unit 24 into
The effect of row modulation.
Due to all signals in detection unit 24 be through the modulated signal of modulated signal M, it is described more
Signal in first electrode 222 and a plurality of second electrode 224 be through the modulated signal of modulated signal M, from
And the lateral parasitic capacitance between adjacent first electrode 222, the laterally parasitic electricity between adjacent second electrode 224 can be reduced
The adverse effect of appearance etc..Furthermore it is also possible to improve the signal-to-noise ratio of pumping signal Vref, and then improve the noise of sensing signal Vd
Than, and then further increase the sensing precision of the capacitance-type sensing device 200.
Referring again to Fig. 5, in some embodiments, the sensor unit 22 can further comprise protective layer 228.Institute
It states protective layer 228 to be arranged in a plurality of first electrode 222 and insulating layer 266, to avoid the first electrode 222 and outside
Boundary directly contacts and damages first electrode 222, to influence to sense effect.So, ground, in other embodiments, institute are changed
Stating protective layer 228 also can be omitted.In addition, for example, when capacitance-type sensing device 200 be biological information sense mould group when, it is described
Protective layer 228 can also be replaced by packaging body, and the sensor unit 22, sensor chip and control chip package are in the encapsulation
Between body and the substrate 220.The packaging body is used to coat the sensor unit 22, sensor chip and control chip, with
And the gap between filling sensor unit 22, sensor chip and control chip.The packaging body for example but is not limited to by ring
The materials such as oxygen resin are made.
It is that first electrode 222 and second electrode 224 and detection unit 24 and modulation are single also referring to Fig. 5 and Fig. 6, Fig. 6
The attachment structure schematic diagram of member 26.It is described as the sensing area I for thering is target object 400 to contact the capacitance-type sensing device 200
The first coupled capacitor CS is formed between target object 400 and a plurality of first electrode 222.In addition, a plurality of first electrode
Multiple second coupled capacitor CF are formed between 222 and a plurality of second electrode 224.Wherein, hanging first electrode 222 and mesh
The the first coupled capacitor CS formed between mark object 400 is that detection unit 24 and the earth are connected in series in the second coupled capacitor CF
Between.Relatively, not hanging first electrode 222 is then used as shielding electricity due to receiving the scheduled reference voltage signal Vp
Pole, correspondingly, the first coupled capacitor CS formed between not hanging first electrode 222 and target object are shielded, will not
It is detected detected by unit 24.Therefore, first formed between target object 400 and hanging first electrode 222 couples electricity
Hold CS to detection unit 24 obtain sensitive information be it is crucial, can be detected detected by unit 24.In the present embodiment,
The target object is finger 400.
Generally, human body is connect with the earth.Correspondingly, when target object is, for example, the finger 400 of human body, then described
One coupled capacitor CS and the second coupled capacitor CF are equivalent to and are connected in series between detection unit 24 and the earth.
It should be noted that in this application, word " contact " includes directly touch and close to both of these case.
In some embodiments, the detection unit 24 includes reference circuit 240, multiple first switch S1 and control
Circuit 242.The reference circuit 240 is corresponded and is connected by the multiple first switch S1 and a plurality of first electrode 222
It connects.The reference circuit 240 is used to provide the described scheduled reference voltage signal Vp to a plurality of first electrode 222.It is described
Control circuit 242 is connect with the multiple first switch S1, is opened or closed for controlling the multiple first switch S1.It needs
Illustrate, in Fig. 6, due to only showing a first electrode 222, correspondingly, a first switch S1 is only shown.
The detection unit 24 controls the multiple first switch S1 by the control circuit 242 and successively disconnects, and comes real
It is successively hanging now to control a plurality of first electrode 222.
When capacitance-type sensing device 200 is executed and sensed, disconnected when the control circuit 242 controls the first switch S1
Up to after the scheduled time, it is closed the first switch S1 currently disconnected, and disconnects the first switch S1 of another closure again.From
And realize and successively disconnect the multiple first switch S1, so that a plurality of first electrode 222 is successively hanging, and then realize sense
Survey operation.
In some embodiments, which is that a constant voltage signal passes through modulated signal M
Modulated signal.So, ground is changed, which can also be a constant voltage signal.Wherein, when this
When scheduled reference voltage signal Vp is constant voltage signal, the reference circuit 240 be preferably provided at the control chip and
In non-sensing chip.The reference circuit 240 be in the control chip with systematically or equipment for voltage basis of reference.
It is described systematically or the signal of equipment ground is generally 0 volt of constant voltage signal.
In some embodiments, first switch S1 can be thin film transistor switch.Such as amorphous silicon film transistor
Switch, low-temperature polysilicon film transistor switch, high temperature polysilicon thin film transistor switch, metal oxide thin-film transistor are opened
Close etc..Wherein metal oxide thin-film transistor switch for example indium gallium zinc (IGZO) thin film transistor switch.Correspondingly,
Grid is coordination electrode, the on/off for control switch；Source electrode is the first transmission electrode, and is connect with reference circuit 240；Leakage
Extremely the second transmission electrode, and connect with first electrode 222.So, ground, in other embodiments, the first switch are changed
S1 may be the switch of other suitable types, e.g., double pole triode switch.Certainly, first switch S1 can also be electricity
Magnetic switch, such as relay etc..For example, when first switch S1 is the switch of the suitable types such as thin film transistor (TFT), it is the multiple
First switch S1 can be formed directly on substrate 220, to reduce the production cost.
Referring again to Fig. 6, in some embodiments, the detection unit 24 can further comprise multiple signal-obtaining electricity
Road 244, the multiple signal read circuits 244 for being connect with a plurality of second electrode 222, provide pumping signal Vref to
The a plurality of second electrode 224, and the sensing signal Vd that a plurality of second electrode 224 exports is received, to obtain sensitive information.
In the present embodiment, the quantity of the multiple signal read circuits 244 is equal to the quantity of second electrode 224, the multiple letter
Number reading circuit 244 connects one to one with a plurality of second electrode 224.The multiple signal read circuits 244 can be same
When output drive signal Vref give all second electrodes 222, and the sensing signal for simultaneously exporting all second electrodes 224
Vd is once run through.
It should be noted that in Fig. 6, due to only showing a second electrode 224, it is described in order to cheer and bright
One signal read circuits 244 is also only shown in detection unit 24.So, in fact, the correspondence of each second electrode 224 is separately connected
One signal read circuits 244.
Ground is changed, in other embodiments, the quantity of the multiple signal read circuits 244 is less than described a plurality of
The quantity of second electrode 224.Correspondingly, signal read circuits 244 at least partially or fully are re-used, and timesharing driving is located at not
Second electrode 224 with position works.
In certain change embodiments, as shown in fig. 7, the detection unit 24 can further comprise multiple second switches
S2.The multiple second switch S2 connects one to one with a plurality of second electrode 224.The control circuit 242 with it is described
Multiple second switch S2 connections are opened or closed for controlling the multiple second switch S2.The multiple signal read circuits
244 number is less than the number of the multiple second switch S2.Signal read circuits 244 at least partially or fully are separately connected
At least two second switch S2, connection at least two second switch S2 244 timesharing of signal read circuits driving with this at least 2 second
The second electrode 224 that switch S2 is separately connected.
In the embodiment shown in figure, the quantity of the multiple second switch S2 is the multiple signal read circuits
Twice of 244, each signal read circuits 244 are separately connected two second switch S2.Correspondingly, the control circuit 242
Second switch S2 closure as controlled half quantity simultaneously every time, all signal read circuits 244 pass through half quantity every time
The second switch S2 of closure drives the second electrode 224 of half to work simultaneously, by switching twice, the multiple signal-obtaining electricity
Road 244 drives all second electrodes 224 to execute primary complete detection.In this way, by time-sharing multiplex, so that the multiple letter
The number of number reading circuit 244 greatly reduces, to reduce the manufacturing cost of capacitance-type sensing device 200.
When work, when the detection unit 24 is successively disconnected with the connection of a plurality of first electrode 222, the multiple signal
244 timesharing of reading circuit is electrically connected with a plurality of second electrode 224.Second switch S2 is controlled by the control circuit 242
Be opened or closed so that the sensing signal Vd that the multiple signal read circuits 244 export second electrode 224 carries out timesharing
It reads.As shown in fig. 7, each signal read circuits 244 are all connected with two second switch S2, to be wherein located at first of left side
For signal read circuits 244, when carrying out the reading of sensing signal Vd, the control circuit 242 is first controlled to be read with the signal
A second switch S2a that is that sense circuit 244 is connected and being located at left side is closed, and controls the second switch S2b for being located at right side
It disconnects；After the sensing signal Vd of second electrode 224 after connect with second switch S2a is read, the control circuit 242 is again
Control signal read circuits 244 connect another second switch S2b closure, second switch S2a disconnect, with read with this second
The sensing signal Vd of the second electrode 224 of switch S2b connection.
It should be noted that for clear differentiation, be connected with first signal read circuits 244 for being located at left side two
Second switch S2 is labeled as S2a and S2b herein.
For another example the quantity of the multiple second switch S2 is 3 times of the multiple signal read circuits 244, Mei Yixin
Number reading circuit 244 connects three second switch S2, correspondingly, three points of the driving simultaneously every time of all signal read circuits 244
One of second electrode 224 work, by switching three times, the multiple signal read circuits 244 drive all second electrodes
224 have executed primary complete detection.The aforementioned quantity to signal read circuits 244 of the application is merely illustrative, so, the application
It is not limited thereto, manufacturer can be correspondingly arranged the signal-obtaining of respective numbers according to demands such as product specification and product quality
Circuit 244.
When the multiple second switch S2 is, for example, the switch of the suitable types such as thin film transistor (TFT), the multiple second is opened
Closing S2 may also be arranged on substrate 220.
Referring to Figure 6 together with Fig. 7, for example control first switch S1 is disconnected the control circuit 242 line by line.So, it can be changed
More, the control circuit 242 can also interlacing control first switch S1 disconnect, be located at for example, the control circuit 242 first controls
The first switch S1 of odd-numbered line is disconnected one by one, and the first switch S1 for then controlling even number line again is disconnected one by one.The control circuit
The disconnection timing of 242 the multiple first switch S1 of control is not by the application mode listed herein, as long as control circuit 242 exists
When controlling current first switch S1 disconnection, and the first switch S1 closure of previous disconnection is controlled, is operated by such control mode,
It can be realized this mode that all first switch S1 are successively disconnected that controls, should all fall into the protection scope of the application.
Reference circuit 240 has an output end (not indicating) in Fig. 7, and to export scheduled reference voltage signal, and this is defeated
Outlet is separately connected multiple first switch S1, to reduce the manufacturing cost of capacitance-type sensing device 200.So, ground is changed,
Also multiple reference circuits can be set, each reference circuit is corresponding to export scheduled reference voltage signal, and each reference signal
Source connects one to one with multiple first switch S1.Or the reference circuit 240 includes multiple output ends, it is the multiple
Output end is connect with the multiple first switch S1 of institute.
Referring to Figure 7 together and Fig. 8, in some embodiments, the signal read circuits 244 include amplifier Q and
Feedback branch F.Wherein, the amplifier Q includes in-phase end a, reverse side b, ground terminal c, power end d and output end vo ut, institute
It states feedback branch F to be connected between the reverse side b and the output end vo ut, the reverse side b further passes through second and opens
Close S2 connection second electrode 224.The in-phase end a is for receiving pumping signal Vref.The ground terminal c is for loading the tune
Signal M processed.The power end d is for loading a supply voltage.The feedback branch F includes feedback capacity CB and third switch
S3, feedback capacity CB and third switch S3 are connected in parallel between the reverse side b and output end vo ut.
When work, the amplifier Q is in empty short status, and the in-phase end a is identical as the voltage of reverse side.Correspondingly,
The pumping signal Vref passes sequentially through in-phase end a, reverse side b and the second switch S2 of closure is exported to second electrode 224.
Meanwhile the multiple first switch S1 of control circuit 242 (see Fig. 6) control is successively disconnected, the reference circuit 240 passes through
The first switch S1 of closure provides scheduled reference voltage signal Vp to first electrode 222.Such as when there is finger 400 (see Fig. 6)
When close to hanging first electrode 222, due to the first coupled capacitor formed between finger 400 and hanging first electrode 222
CS is to be serially connected between signal read circuits 244 and the earth with the second coupled capacitor CF, and not hanging first electrode 222 is used as
Bucking electrode, therefore, the sensing signal Vd of the corresponding output of a plurality of second electrode 224 have difference.Wherein, second electricity
Pole 224, which is used to export corresponding sensing signal Vd by the feedback branch F, gives output end vo ut.To the detection unit
24 can obtain corresponding sensitive information according to the sensing signal Vd that a plurality of second electrode 224 exports.For example, obtaining fingerprint
Image information, or, obtain touch operation information.
It should be noted that when the capacitance-type sensing device 200 for example executes fingerprint sensing, due to finger 400
Fingerprint includes ridge and paddy, and therefore, the capacitance that the first coupled capacitor CS is formed between ridge and hanging first electrode 222 is greater than paddy
The capacitance of the first coupled capacitor CS is formed between hanging first electrode 222.
The signal read circuits 244 are not limited to the application circuit shown in Fig. 8, can also be the electricity of other suitable types
Road as long as can be realized transmission pumping signal Vref to second electrode 224, and receives the sensing exported from second electrode 224
Signal Vd is the protection scope for all falling within the application.
In addition, may be selected further to increase filter circuit after output end vo ut in the detection unit 24 of the application, putting
The circuits such as big circuit, analog to digital conversion circuit.
Referring to Fig. 9, Fig. 9 is the structural schematic diagram of an embodiment of the electronic equipment of the application.The electronic equipment
500 such as, but not limited to consumer electrical product, household formula electronic product, vehicular electronic product or wearable electronics produce
The product of any suitable type such as product.Wherein, consumer electrical product is, for example, mobile phone, tablet computer, laptop, desktop
All kinds of suitable electronic products such as display, computer all-in-one machine.Household formula electronic product is, for example, intelligent door lock, TV, refrigerator
Etc. all kinds of suitable electronic products.Vehicular electronic product such as example all kinds of suitable electronics such as automatic navigator, vehicle-carrying DVD
Product.Wearable electronic product is, for example, all kinds of suitable electronic products such as wrist-watch, bracelet, ring.
The electronic equipment 500 includes the capacitance-type sensing device 200 of any of the above-described embodiment.
In some embodiments, the electronic equipment 500 can further comprise viewing area 501 and non-display area 502.Its
In, display screen is arranged in the corresponding viewing area 501 of the electronic equipment 500, for showing picture etc..Non-display area 502 is located at display
Around area 501.Normally, the front of the electronic equipment 500 includes cover sheet 503.
The capacitance-type sensing device 200 is, for example, biological information sensing mould group or image sensing mould group, is arranged in institute
The non-display area 502 of electronic equipment 500 is stated, such as is arranged in the corresponding position of Home key.Specifically, the capacitive sensing dress
Set 200 lower sections that can be hidden in cover sheet 503.Ground is changed, the capacitance-type sensing device 200 can also expose to the open air in protection cap
One through hole of plate 503.In addition, the capacitance-type sensing device 200 may also be arranged on side or back side of electronic equipment 500 etc.
Suitable position.
Further, when the capacitance-type sensing device 200 is that biological information senses mould group or image sensing mould group, institute
Stating capacitance-type sensing device 200 may be alternatively located at viewing area 501, for example, the sensor unit 22 of the capacitance-type sensing device 200
(see Fig. 3) is located at the regional area of viewing area 501.
It should be noted that when the capacitance-type sensing device 200 is that biological information senses mould group or image sensing mould group
When, touch-sensing also can be performed in the biological information sensing mould group or image sensing mould group.
The sensor unit 22 (see Fig. 3) of the capacitance-type sensing device 200 may be alternatively located at whole areas of viewing area 501
Domain.Optionally, the capacitance-type sensing device 200 executes touch-sensing and biological information senses.For example, the condenser type
Sensing device 200 is for executing touch-sensing, and regional area is for executing biological information sensing.In another example the electricity
Appearance formula sensing device 200 can also execute touch-sensing and biological information sensing etc. for timesharing, in this way, the electronic equipment
500 can full frame execution biological information sensing.
In the description of this specification, reference term " embodiment ", " certain embodiments ", " schematically implementation
What the description of mode ", " example ", " specific example " or " some examples " etc. meant to describe in conjunction with the embodiment or example
Particular features, structures, materials, or characteristics are contained at least one embodiment or example of the utility model.In this explanation
In book, schematic expression of the above terms are not necessarily referring to identical embodiment or example.Moreover, the specific spy of description
Sign, structure, material or feature can be combined in any suitable manner in any one or more embodiments or example.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-mentioned embodiment party
Formula is exemplary, and should not be understood as limiting the present invention, and those skilled in the art are in the utility model
Above embodiment can be changed, be modified in range, replacement and variant.
Claims (14)
1. a kind of detection unit, for connect with a sensor unit, the sensor unit include a plurality of first electrode with it is more
Second electrode, a plurality of first electrode and a plurality of second electrode insulate cross arrangement, wherein a plurality of first electricity
Pole is located above a plurality of second electrode, and a plurality of first electrode is used to connect back to the side of a plurality of second electrode
Receive target object close to input；The detection unit includes:
Multiple first switches；
Reference circuit is connect by the multiple first switches of institute with a plurality of first electrode alternative, predetermined for providing one
Reference voltage signal give a plurality of first electrode；
Signal read circuits for providing a pumping signal to a plurality of second electrode, and are received and are exported from second electrode
Sensing signal；With
Control circuit；
When the detection unit drives the sensor unit to execute sensing operation, the control circuit is described more by controlling
A first switch successively disconnects, successively hanging to control a plurality of first electrode.
2. detection unit as described in claim 1, it is characterised in that: first switch described in the every secondary control one of control circuit
It disconnects, controls remaining first switch closure.
3. detection unit as claimed in claim 2, it is characterised in that: the first electrode connecting with the first switch of closure receives
Scheduled reference voltage signal from the reference circuit.
4. detection unit as described in claim 1, it is characterised in that: the detection unit further comprises multiple second switches
With multiple signal read circuits, the multiple signal read circuits pass through the multiple second switch and described a plurality of second
Electrode connection, whether the control circuit is used to control the shutdown of the multiple second switch.
5. detection unit as claimed in claim 4, it is characterised in that: the number of the multiple signal read circuits is less than described
The number of multiple second switches, wherein all or part of signal read circuits connect at least two second switches.
6. detection unit as claimed in claim 5, it is characterised in that: the signal-obtaining electricity being connected at least two second switches
Road drives the second electrode being connected at least two second switches for timesharing.
7. the detection unit as described in any one of claim 1-6, it is characterised in that: the detection unit is further with one
Modulation unit connection, for receiving the modulated signal of the modulation unit output, the pumping signal and the scheduled reference
Voltage signal is through the modulated signal of the modulated signal.
8. detection unit as claimed in claim 7, it is characterised in that: the signal of the detection unit is to believe through the modulation
Signal after number synchronous modulation.
9. detection unit as claimed in claim 7, it is characterised in that: the signal read circuits include amplifier and feedback branch
Road, the amplifier include in-phase end, reverse side, output end and ground terminal, wherein the feedback branch is connected to described anti-
Between phase end and output end, the reverse side is further used for connecting with second electrode, and the in-phase end is described sharp for receiving
Signal is encouraged, the ground terminal is for receiving the modulated signal.
10. detection unit as described in claim 1, it is characterised in that: the detection unit is integrated in a sensor chip.
11. detection unit as described in claim 1, it is characterised in that: the detection unit is for driving the sensor list
Member executes touch-sensing and/or biological information sensing.
12. detection unit as described in claim 1, it is characterised in that: the detection unit is for driving the sensor list
Member executes fingerprint sensing.
13. a kind of capacitance-type sensing device, including detection unit described in any one of claim 1-12.
14. a kind of electronic equipment, including the capacitance-type sensing device described in claim 13.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/087596 WO2018223336A1 (en) | 2017-06-08 | 2017-06-08 | Detection unit, capacitive sensing apparatus, and electronic device |
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| Publication Number | Publication Date |
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| CN209460750U true CN209460750U (en) | 2019-10-01 |
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| CN201790000087.XU Active CN209460750U (en) | 2017-06-08 | 2017-06-08 | Detection unit, capacitance-type sensing device and electronic equipment |
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| CN (1) | CN209460750U (en) |
| WO (1) | WO2018223336A1 (en) |
Cited By (1)
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|---|---|---|---|---|
| CN111308736A (en) * | 2020-02-19 | 2020-06-19 | 合肥京东方光电科技有限公司 | Glasses and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20110129407A (en) * | 2009-03-19 | 2011-12-01 | 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. | Three phase capacitance-based sensing |
| JP2015122141A (en) * | 2013-12-20 | 2015-07-02 | アイシン精機株式会社 | Electrostatic capacitance sensor electrode |
| CN205028266U (en) * | 2015-09-23 | 2016-02-10 | 深圳信炜科技有限公司 | Capacitive sensor , sensing device , sensing system and electronic equipment |
| 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 |
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2017
- 2017-06-08 WO PCT/CN2017/087596 patent/WO2018223336A1/en active Application Filing
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308736A (en) * | 2020-02-19 | 2020-06-19 | 合肥京东方光电科技有限公司 | Glasses and control method thereof |
| CN111308736B (en) * | 2020-02-19 | 2021-11-12 | 合肥京东方光电科技有限公司 | Glasses and control method thereof |
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| WO2018223336A1 (en) | 2018-12-13 |
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