CN209447146U

CN209447146U - Fingerprint sensing device and electronic equipment

Info

Publication number: CN209447146U
Application number: CN201790000088.4U
Authority: CN
Inventors: 林峰
Original assignee: Shenzhen Sunwave Technology Co Ltd
Current assignee: Liuzhou Zibo Technology Co.,Ltd.
Priority date: 2017-06-08
Filing date: 2017-06-08
Publication date: 2019-09-27
Anticipated expiration: 2027-06-08
Also published as: WO2018223335A1

Abstract

The utility model discloses a kind of fingerprint sensing device and electronic equipments.The fingerprint sensing device includes sensor unit and detection unit.The sensor unit includes a plurality of first electrode and a plurality of second electrode, and a plurality of first electrode and a plurality of second electrode insulate cross arrangement.The detection unit includes: multiple first switches, is connected one to one with a plurality of first electrode；Control circuit, for controlling the shutdown timing of the multiple first switch；Reference circuit is connect by the multiple first switch with a plurality of first electrode alternative, and the reference circuit is for providing a scheduled reference voltage to a plurality of first electrode；And signal read circuits, for providing a pumping signal to a plurality of second electrode, and the sensing signal exported from second electrode is received, to obtain finger print information.The electronic equipment includes above-mentioned fingerprint sensing device.

Description

Fingerprint sensing device and electronic equipment

Technical field

The utility model relates to a kind of fingerprint sensing device and electronic equipments.

Background technique

Currently, fingerprint sensing device is gradually gained popularity.So, the cost of fingerprint 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 fingerprint sensing device and electronic equipment with novel embodiment.

The utility model provides a kind of fingerprint sensing device, comprising:

Sensor unit, including a plurality of first electrode and a plurality of second electrode, a plurality of first electrode and described a plurality of Second electrode insulation cross arrangement；With

Detection unit, for driving the sensor unit to execute fingerprint sensing, the detection unit includes:

Multiple first switches connect one to one with a plurality of first electrode；

Control circuit, for controlling the shutdown timing of the multiple first switch；

Reference circuit is connect by the multiple first switch with a plurality of first electrode alternative, the reference Circuit is for providing a scheduled reference voltage to a plurality of first electrode；With

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, to obtain finger print information.

Relatively, existing fingerprint sensing device includes multiple rectangular block shape electrodes, and the multiple rectangular block shape electrode is same Layer is coplanar, is spaced each other, arranged in arrays, each rectangular block shape electrode passes through a conducting wire respectively and is connected to detection circuit.Its In, each block type electrode respectively corresponds as a sensor pixel point.

It is can be seen that by comparing since the fingerprint sensing device of the application includes a plurality of first electrode and described more Second electrode, and a plurality of first electrode and a plurality of second electrode insulation intersect, each infall is then correspondingly formed Sensor pixel point, therefore, compared to above-mentioned existing fingerprint sensing device, the fingerprint sensing device of the application is guaranteeing to sense In the case that pixel is enough, a plurality of first electrode and a plurality of second electrode are connected to the conducting wire of detection unit Quantity is reduced, thus, the cost of fingerprint sensing device can be reduced.

In addition, the fingerprint sensing device can also be conducive to towards miniaturization since number of conductors is reduced.

In some embodiments, when the signal read circuits provide the pumping signal to a plurality of second electrode When executing sensing, the control circuit controls the multiple first switch and successively disconnects, so that a plurality of first electrode is successively Vacantly, the reference circuit provides the scheduled reference voltage signal to the first not hanging electricity by the first switch being closed Pole.

In some embodiments, in synchronization, the control circuit only controls a first switch and disconnects, control Remaining first switch is closed.

In some embodiments, the detection unit further comprises multiple second switches and multiple signal-obtainings Circuit, the multiple second switch connect one to one with a plurality of second electrode, wherein the number of the multiple second switch Amount is more than the quantity of the multiple signal read circuits, each of some or all of in the multiple signal read circuits Signal read circuits are separately connected at least two second switches, the to be connected for timesharing driving at least two second switches The work of two electrodes.

In some embodiments, the control circuit be further used for controlling the on-off of the multiple second switch with It is no.

In some embodiments, a plurality of first electrode is compared to a plurality of second electrode closer to the hand of user Refer to.

In some embodiments, the sensor unit further comprises insulating substrate and insulating layer, described a plurality of Two electrodes are arranged on the insulating substrate, and the insulating layer is arranged in a plurality of second electrode, a plurality of first electricity Pole is arranged on the insulating layer, wherein a plurality of first electrode is back to the side of a plurality of second electrode for receiving User's finger in contact with or close to input.

In some embodiments, the detection unit further comprises modulation unit, for export a modulated signal to The detection unit, the pumping signal and the scheduled reference voltage signal are through the modulated letter of the modulated signal Number.

In some embodiments, the signal read circuits include amplifier and feedback branch, wherein the amplifier Including in-phase end, reverse side, output end and ground terminal, the feedback branch be connected to the reverse side and the output end it Between, the reverse side is further used for connecting with second electrode, and the in-phase end is for receiving the pumping signal, the ground connection End is for receiving the modulated signal.

The utility model also provides a kind of electronic equipment, including the fingerprint sensing device described in any one of above-mentioned.

Since the electronic equipment includes the fingerprint sensing device, cost is relatively low for the electronic equipment.

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 fingerprint sensing device；

Fig. 2 is the circuit block diagram of the fingerprint 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 fingerprint sensing device of the utility model embodiment；

Fig. 6 be first electrode and second electrode and detection unit in the fingerprint sensing device of the utility model embodiment, The attachment structure schematic diagram of modulation unit；

Fig. 7 is that the first electrode and second electrode in the fingerprint sensing device of the utility model embodiment are corresponded to and referred to The attachment structure schematic diagram of circuit and signal read circuits；

Fig. 8 is the fingerprint sensing device of the utility model embodiment in the schematic equivalent circuit for executing capacitance sensing；

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 fingerprint sensing device.The fingerprint sensing device 100 Including substrate 10, multiple sensing electrodes 12 and detection circuit 16.The multiple sensing electrode 12 is formed on the substrate 10, And the multiple sensing electrode 12 is arranged in two-dimensional array type, that is, forms sensor array 14.The multiple 12 same layer of sensing electrode It is coplanar, and each sensing electrode 12 forms a sensor pixel point.The detection circuit 16 is formed on the substrate 10, and the biography is located at Feel the periphery of array 14.The detection circuit 16 is electrically connected with each sensing electrode 12, for providing pumping signal to each sense Electrode 12 is surveyed, each sensing electrode 12 is driven to execute sensing operation.Further, the detection circuit 16, which receives, comes from sensing electrode The sensing signal of 12 outputs, and finger print information is obtained according to the sensing signal.

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 fingerprint sensing device 100 cost of manufacture.In addition, must have certain interval between conducting wire and conducting wire to meet electrical requirements, therefore arrange Conducting wire is more, and the size of fingerprint sensing device 100 is bigger, to guarantee the yield of fingerprint sensing device 100, to be unfavorable for fingerprint The miniaturization of sensing device 100.

In particular, when the fingerprint sensing device 100 is, for example, the fingerprint sensing mould group of small size, above-mentioned technology is asked Topic is more prominent.Generally, the fingerprint sensing mould group of small size is arranged on the non-display area of such as mobile terminal, for example, position Position in Home key, the back side positioned at mobile terminal and side etc..So, ground is changed, the fingerprint sensing mould group can also be set It sets in the viewing area of such as mobile terminal.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 fingerprint sensing devices 200.It please one And refering to Fig. 2 and Fig. 3, Fig. 2 is the circuit block diagram of the fingerprint sensing device 200 of the utility model, and Fig. 3 is that fingerprint shown in Fig. 2 passes The structural schematic diagram of one embodiment of the sensor unit of induction device 200.The fingerprint sensing device 200, which can be used for executing, to be referred to Line information sensing.The fingerprint sensing device 200 includes sensor unit 22 and detection unit 24.

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 detection unit 24 is for providing a pumping signal Vref to described in a plurality of second electrode 224 and control A plurality of first electrode 222 is successively hanging and provides scheduled reference voltage signal Vp to not hanging first electrode 222, comes The sensor unit 22 is driven to execute finger print information sensing.

Since the fingerprint sensing device 200 of the application includes a plurality of first electrode 222 and a plurality of second electrode 224, and a plurality of first electrode 222 and a plurality of second electrode 224 insulation intersect, each infall is then correspondingly formed one Sensor pixel point, therefore, compared to above-mentioned existing fingerprint sensing device, the fingerprint sensing device 200 of the application is guaranteeing to feel In the case that survey pixel is enough, a plurality of first electrode 222 and a plurality of second electrode 224 are connected to detection unit The quantity of 24 conducting wire is reduced, thus, the cost of fingerprint sensing device 200 can be reduced.

Further, since number of conductors is reduced, the fingerprint sensing device 200 can also be conducive to towards miniaturization.

When the fingerprint sensing device 200 executes finger print information sensing, the every control one of the detection unit 24 described the One electrode 222 is hanging, and corresponding remaining first electrode 222 that controls receives the scheduled reference voltage signal Vp.

The detection unit 24 further receives the sensing signal Vd exported from second electrode 224, to obtain fingerprint image As information.

When the finger of user is close to the fingerprint sensing device 200, a plurality of first electrode 222 is more compared to described Second electrode 224 is closer to the finger of user, then a plurality of first electrode 222 for being coupled to finger in a capacitive manner 400 (see Fig. 6).The fingerprint sensing device 200 is used to sense the information in fingerprint of the finger 400.

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, i.e. the fingerprint sensing fills M*n the second coupled capacitor CF can be formed with by setting 200 (see Fig. 6).Change ground, first direction and second direction for example can also be with It is 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 Two electrodes 224 are in rectangular strip, so, change ground, a plurality of first electrode 222 and a plurality of second electrode 224 can also 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 electricity Hold 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 Bright, number 56 herein is an example, and the number of actual product is all possible more or less than 56, and manufacturer can root 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, such as It is 45 °, 60 ° etc..In the present embodiment, the first electrode 222 and second electrode 224 are rectangular block shape, and so, the application is simultaneously Not limited to this, the first electrode 222 and second electrode 224 can also be other suitable shapes.Compare shown in Fig. 3 first The length of 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 again to Fig. 2, in some embodiments, the fingerprint sensing device 200 can further comprise modulation unit 26, for generating modulated signal M, and the modulated signal M is exported to the detection unit 24.

Optionally, the signal in the detection unit 24 is through the modulated signal of modulated signal M.For example, institute It states pumping signal Vref and scheduled reference voltage signal Vp is by the modulated signal of modulated signal M.So, it can be changed More, can also be part signal in the detection unit 24 is through the modulated signal of modulated signal M.For example, described swash Signal Vref is encouraged to pass through the modulated signal of modulated signal M.The scheduled reference voltage signal Vp is a constant electricity Press signal.

Since the pumping signal Vref is to pass through the modulated signal of modulated signal M, it is thus possible to improve described The signal-to-noise ratio of fingerprint sensing device 200, and then improve the sensing precision of the fingerprint 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.

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 fingerprint sensing device 200.

It should be noted that the fingerprint sensing device 200 can also omit the tune in the embodiment of some changes Unit 26 processed.Correspondingly, the ground terminal of the detection unit 24 for example loads 0 volt of constant voltage signal.Below mainly with institute State fingerprint sensing device 200 using for modulation technique newly into explanation.

Referring to Fig. 5, Fig. 5 is the schematic cross-section of the application fingerprint sensing device 200.In some embodiments, on Stating sensor unit 22 can further comprise substrate 220 and insulating layer 226.The a plurality of second electrode 224 is arranged in substrate 220 On, 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, institute State a plurality of first electrode 222 back to the side of a plurality of second electrode 224 be used to receive user's finger in contact with or close to defeated Enter.Region where defining first electrode 222 and second electrode 224 is sensing area I, defines and is located at sensing area I weeks on substrate 220 The region enclosed 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 fingerprint sensing device 200 of member 22 further decreases.

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 fingerprint sensing device 200 be small size fingerprint sensing mould group when, institute Packaging body can also be replaced by by stating protective layer 228, and the sensor unit 22, sensor chip and control chip package are in the envelope It fills between body and the substrate 220.The packaging body is used to coat the sensor unit 22, sensor chip and control chip, And the gap between filling sensor unit 22, sensor chip and control chip.The packaging body for example but be not limited to by The materials such as epoxy 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.As the sensing area I for thering is finger 400 to contact the fingerprint sensing device 200, the finger The first coupled capacitor CS is formed between 400 and a plurality of first electrode 222.In addition, a plurality of first electrode 222 with it is described Multiple second coupled capacitor CF are formed between a plurality of second electrode 224.Wherein, between hanging first electrode 222 and finger 400 The the first coupled capacitor CS formed is and the second coupled capacitor CF is connected in series between detection unit 24 and the earth.Relatively, Not hanging first electrode 222 is then used as bucking electrode, correspondingly, not due to receiving the scheduled reference voltage signal Vp The the first coupled capacitor CS formed between hanging first electrode 222 and finger 400 is shielded, and will not be detected 24 institute of unit It detects.Therefore, the first coupled capacitor CS formed between finger 400 and hanging first electrode 222 obtains detection unit 24 Take sensitive information be it is crucial, can be detected detected by unit 24.

Generally, human body is connect with the earth.Correspondingly, the first coupled capacitor CS and the second coupled capacitor CF is equivalent to It is 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 fingerprint sensing device 200 is executed and sensed, reached when the control circuit 242 controls the first switch S1 disconnection After the scheduled time, it is closed the first switch S1 currently disconnected, and disconnects the first switch S1 of another closure again.To, Realization successively disconnects the multiple first switch S1, so that a plurality of first electrode 222 is successively hanging, and then realizes sensing behaviour Make.

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 fingerprint 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 information in fingerprint according to the sensing signal Vd that a plurality of second electrode 224 exports.

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 fingerprint 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 fingerprint sensing device 200 is, for example, the fingerprint sensing mould group of small size, and the electronic equipment 500 is arranged in Non-display area 502, such as be arranged in the corresponding position of Home key.Specifically, the fingerprint sensing device 200 can be hidden in protection The lower section of cover board 503.Ground is changed, the fingerprint sensing device 200 can also expose to the open air in a through hole of cover sheet 503.Separately Outside, the fingerprint sensing device 200 may also be arranged on the suitable position such as side or back side of electronic equipment 500.

Further, when the fingerprint sensing device 200 is fingerprint sensing mould group, the fingerprint sensing device 200 Viewing area 501 can be located at, for example, the sensor unit 22 (see Fig. 3) of the fingerprint sensing device 200 is located at viewing area 501 Regional area.

It should be noted that when the fingerprint sensing device 200 is fingerprint sensing mould group, the fingerprint sensing mould group Executable touch-sensing.

The sensor unit 22 (see Fig. 3) of the fingerprint sensing device 200 may be alternatively located at the whole region of viewing area 501. Optionally, the fingerprint sensing device 200 executes touch-sensing and information in fingerprint senses.For example, the fingerprint sensing dress 200 are set for executing touch-sensing, and regional area is for executing information in fingerprint sensing.In another example the fingerprint sensing Device 200 can also execute touch-sensing and information in fingerprint sensing etc. for timesharing, in this way, the electronic equipment 500 can be complete Screen executes information in fingerprint 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

1. a kind of fingerprint sensing device, comprising: sensor unit, it is characterised in that:

The sensor unit includes a plurality of first electrode and a plurality of second electrode, a plurality of first electrode and described a plurality of Two electrode insulation cross arrangements；

The fingerprint sensing device further include:

Reference circuit is connect by the multiple first switch with a plurality of first electrode alternative, the reference circuit For providing a scheduled reference voltage to a plurality of first electrode；With

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, to obtain finger print information.

2. fingerprint sensing device as described in claim 1, it is characterised in that: when the signal read circuits provide the excitation When signal executes sensing to a plurality of second electrode, the control circuit controls the multiple first switch and successively disconnects, and makes The a plurality of first electrode it is successively hanging, the reference circuit by closure first switch provide it is described it is scheduled with reference to electricity Press signal to not hanging first electrode.

3. fingerprint sensing device as claimed in claim 2, it is characterised in that: in synchronization, the control circuit is only controlled One first switch disconnects, and controls the closing of remaining first switch.

4. fingerprint sensing device as claimed in claim 2, it is characterised in that: the detection unit further comprises multiple second Switch and multiple signal read circuits, the multiple second switch connect one to one with a plurality of second electrode, In, the quantity of the multiple second switch is more than the quantity of the multiple signal read circuits, the multiple signal read circuits In some or all of each of signal read circuits be separately connected at least two second switches, for timesharing driving with it is described The second electrode work that at least two second switches are connected.

5. fingerprint sensing device as claimed in claim 4, it is characterised in that: the control circuit is further used for described in control Whether the on-off of multiple second switches.

6. the fingerprint sensing device as described in any one of claim 1-5, it is characterised in that: a plurality of first electrode phase Compared with a plurality of second electrode closer to the finger of user.

7. the fingerprint sensing device as described in any one of claim 1-5, it is characterised in that: the sensor unit is into one Step includes insulating substrate and insulating layer, and a plurality of second electrode is arranged on the insulating substrate, and the insulating layer setting exists In a plurality of second electrode, a plurality of first electrode is arranged on the insulating layer, wherein a plurality of first electrode back To the side of a plurality of second electrode be used to receive user's finger in contact with or close to input.

8. the fingerprint sensing device as described in any one of claim 1-5, it is characterised in that: the detection unit is further Including modulation unit, for exporting a modulated signal to the detection unit, the pumping signal and the scheduled reference electricity Pressing signal is through the modulated signal of the modulated signal.

9. fingerprint sensing device as claimed in claim 8, it is characterised in that: the signal read circuits include amplifier and anti- Present branch, wherein the amplifier includes in-phase end, reverse side, output end and ground terminal, and the feedback branch is connected to institute It states between reverse side and the output end, the reverse side is further used for connecting with second electrode, and the in-phase end is for connecing The pumping signal is received, the ground terminal is for receiving the modulated signal.

10. a kind of electronic equipment, it is characterised in that: including fingerprint sensing device described in any one of claim 1-9.