WO2018223334A1 - 图像传感装置及电子设备 - Google Patents

图像传感装置及电子设备 Download PDF

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Publication number
WO2018223334A1
WO2018223334A1 PCT/CN2017/087594 CN2017087594W WO2018223334A1 WO 2018223334 A1 WO2018223334 A1 WO 2018223334A1 CN 2017087594 W CN2017087594 W CN 2017087594W WO 2018223334 A1 WO2018223334 A1 WO 2018223334A1
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WIPO (PCT)
Prior art keywords
electrodes
image sensing
sensing device
electrode
signal
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Application number
PCT/CN2017/087594
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English (en)
French (fr)
Inventor
林峰
Original Assignee
深圳信炜科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 深圳信炜科技有限公司 filed Critical 深圳信炜科技有限公司
Priority to PCT/CN2017/087594 priority Critical patent/WO2018223334A1/zh
Priority to CN201790000081.2U priority patent/CN209283367U/zh
Publication of WO2018223334A1 publication Critical patent/WO2018223334A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Definitions

  • the utility model relates to an image sensing device and an electronic device.
  • image sensing devices such as fingerprint sensing devices
  • cost of the image sensing device is still high.
  • the embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art. To this end, the embodiments of the present invention need to provide an image sensing device and an electronic device.
  • the utility model provides an image sensing device, comprising:
  • a sensor unit comprising a plurality of first electrodes and a plurality of second electrodes, wherein the plurality of first electrodes and the plurality of second electrodes are insulated and arranged in an intersecting manner;
  • a detecting unit configured to provide an excitation signal to the plurality of second electrodes, and control the plurality of first electrodes to be suspended, and provide a predetermined reference voltage signal to the first electrode that is not suspended to drive the sensor unit Perform texture information sensing.
  • the existing image sensing device includes a plurality of rectangular block electrodes, which are coplanar with the same layer, spaced apart from each other, arranged in a matrix, and each rectangular block electrode is connected to each other through a wire Detection circuit.
  • Each of the block electrodes corresponds to a sensing pixel.
  • the image sensing device of the present application includes the plurality of first electrodes and the plurality of second electrodes, and the plurality of first electrodes and the plurality of second electrodes are insulated and intersected, Each of the intersections correspondingly forms a sensing pixel. Therefore, compared with the above-mentioned existing image sensing device, the image sensing device of the present application ensures that the sensing pixel points are sufficient, the plurality of The number of wires connecting the first electrode and the plurality of second electrodes to the detecting unit is reduced, so that the cost of the image sensing device can be reduced.
  • the image sensing device can also be developed toward miniaturization.
  • the detecting unit controls each of the first electrodes to be suspended, and correspondingly controls the remaining first electrodes to receive the predetermined reference voltage signal.
  • the plurality of first electrodes are located above the plurality of second electrodes, and the plurality of first electrodes are configured to form a first contact with a target object contacting or approaching the image sensing device a coupling capacitor, a plurality of second coupling capacitors formed at intersections of the plurality of first electrodes and the plurality of second electrodes.
  • the detecting unit acquires any one or more of fingerprint information, palm print information, and ear pattern information of the target object according to the sensing signals output by the plurality of second electrodes.
  • the sensor unit further includes an insulating substrate and an insulating layer, wherein the plurality of second electrodes are disposed on the insulating substrate, and the insulating layer is disposed on the plurality of second electrodes The plurality of first electrodes are disposed on the insulating layer.
  • the detection unit is integrated in a sensing chip, and the sensing chip is disposed on the insulating substrate.
  • the detecting unit includes a reference circuit, a plurality of first switches, and a control circuit; the reference circuit is separately coupled to the plurality of switches for providing the plurality of first switches Deriving a predetermined reference voltage signal to the plurality of first electrodes; the plurality of first switches and the plurality of first electrodes are connected one-to-one; the control circuit is configured to control the plurality of first switches Turn off the timing.
  • the control circuit controls a first switch to be turned off
  • the first electrode connected to the open first switch is in a floating state, and the remaining is connected to the closed first switch.
  • the first electrode is then used as a shield electrode.
  • the detecting unit further includes a plurality of signal reading circuits for providing the excitation signal to the plurality of second electrodes and receiving the second electrode The sensed signal output.
  • the detecting unit further includes a plurality of second switches, the plurality of signal reading circuits being connected to the plurality of second electrodes by the plurality of second switches, the control circuit further And connecting to the plurality of second switches for controlling whether the plurality of second switches are turned off, wherein at least some or all of the signal reading circuits are respectively connected to the at least two second switches.
  • the plurality of first electrodes are coplanar with each other, and the plurality of second electrodes are coplanar with each other, and the plurality of first electrodes and the plurality of second electrodes are located in different layers, and the two are vertically disposed.
  • the image sensing device further includes a modulation unit for generating The signal is modulated and output to the detecting unit, and the signals output by the detecting unit to the sensor unit are signals modulated by the modulated signal.
  • the detecting unit includes a ground
  • the modulation circuit outputs the modulated signal to the ground for use as a ground signal of the detecting unit.
  • the present invention also provides an electronic device comprising the image sensing device of any of the above.
  • the electronic device includes a mobile terminal, a smart home product, an in-vehicle electronic product, and a wearable product.
  • the electronic device includes the image sensing device, the cost of the electronic device is low.
  • FIG. 1 is a schematic structural view of a conventional image sensing device
  • FIG. 2 is a circuit block diagram of an image sensing device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural view of an embodiment of the sensor unit of FIG. 2;
  • FIG. 4 is a schematic structural view of another embodiment of the sensor unit of FIG. 2;
  • FIG. 5 is a schematic cross-sectional view of an image sensing device according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram showing a connection structure between a first electrode and a second electrode, a detecting unit, and a modulating unit in an image sensing device according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram showing a connection structure of a first electrode and a second electrode corresponding to a reference circuit and a signal reading circuit in an image sensing device according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of an equivalent circuit of performing image sensing in an image sensing apparatus according to an embodiment of the present invention.
  • FIG. 9 is a schematic plan view of an electronic device according to an embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. .
  • features defining “first” or “second” may include one or more of the described features either explicitly or implicitly.
  • the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.
  • connection is to be understood broadly, and may be, for example, a fixed connection or a Disassembling the connection, or connecting integrally; may be mechanical connection, electrical connection or communication with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or mutual interaction of two elements Role relationship.
  • installation is to be understood broadly, and may be, for example, a fixed connection or a Disassembling the connection, or connecting integrally; may be mechanical connection, electrical connection or communication with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or mutual interaction of two elements Role relationship.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • FIG. 1 is a schematic structural diagram of a conventional image sensing device.
  • the image sensing device 100 includes a substrate 10, a plurality of sensing electrodes 12, and a detection circuit 16.
  • the multiple senses The measuring electrode 12 is formed on the substrate 10, and the plurality of sensing electrodes 12 are arranged in a two-dimensional array, that is, the sensing array 14 is formed.
  • the plurality of sensing electrodes 12 are coplanar with each other, and each sensing electrode 12 forms a sensing pixel.
  • the detection circuit 16 is formed on the substrate 10 at the periphery of the sensing array 14.
  • the detecting circuit 16 is electrically connected to each sensing electrode 12 for providing an excitation signal to each sensing electrode 12, and driving each sensing electrode 12 to perform a sensing operation.
  • the detecting circuit 16 receives the sensing signal output from the sensing electrode 12, and acquires the texture image information according to the sensing signal.
  • the texture image information is, for example, suitable texture image information on the living body, such as but not limited to one or more of fingerprint image information, palm print image information, and ear print image information.
  • the organism is, for example but not limited to, a human body, and may be other suitable organisms.
  • the detecting circuit 16 is electrically connected to each of the sensing electrodes 12, for example, by wires, if the number of sensing electrodes 12 is large, the arrangement of the wires will be greatly increased, thereby increasing the image.
  • the manufacturing cost of the sensing device 100 in order to meet the electrical requirements, the wires and the wires must have a certain interval. Therefore, the more wires are arranged, the larger the size of the image sensing device 100 is to ensure the yield of the image sensing device 100, thereby being disadvantageous.
  • the miniaturization of the image sensing device 100 has progressed.
  • a small-sized image sensing module is disposed, for example, in a non-display area of a mobile terminal, for example, at a location of a Home button, at a back side of a mobile terminal, and at a side.
  • the image sensing module can also be disposed in, for example, a display area of the mobile terminal.
  • the display area is an area where the mobile terminal displays an image.
  • FIG. 2 is a circuit block diagram of the image sensing device 200 of the present invention
  • FIG. 3 is a schematic structural view of an embodiment of the sensor unit of the image sensing device 200 of FIG.
  • the image sensing device 200 can be used to perform texture information sensing.
  • the image sensing device 200 includes a sensor unit 22 and a detecting unit 24.
  • the sensor unit 22 includes a plurality of first electrodes 222 and a plurality of second electrodes 224.
  • the plurality of first electrodes 222 and the plurality of second electrodes 224 are insulated and arranged in a cross.
  • the detecting unit 24 is configured to provide an excitation signal Vref to the plurality of second electrodes 224, and control the plurality of first electrodes 222 to be suspended in a row, and provide a predetermined reference voltage signal Vp to the first one that is not suspended.
  • the electrode 222 drives the sensor unit 22 to perform texture information sensing.
  • the image sensing device 200 of the present application includes the plurality of first electrodes 222 and the plurality of second electrodes 224, and the plurality of first electrodes 222 and the plurality of second electrodes 224 are insulated and intersected, each An intersection is formed to form a sensing pixel. Therefore, compared with the above-mentioned existing image sensing device, the image sensing device 200 of the present application ensures that the sensing pixel is sufficiently large. The number of wires connecting the first electrode 222 and the plurality of second electrodes 224 to the detecting unit 24 is reduced, and thus, the cost of the image sensing device 200 can be reduced.
  • the image sensing device 200 can also be developed toward miniaturization.
  • the detecting unit 24 controls the remaining first electrode 222 to control the remaining first electrode 222 to receive the predetermined reference voltage signal Vp.
  • the detecting unit 24 further receives the sensing signal Vd output from the second electrode 224 to acquire the texture image information.
  • the plurality of first electrodes 222 are for capacitively coupling to a target object.
  • the image sensing device 200 is configured to sense texture image information of the target object.
  • the texture image information is, for example, suitable texture information on a living body such as fingerprint information, palm print information, and ear print information.
  • the target object corresponds to, for example, a finger, a palm, an ear, or the like.
  • the detecting unit 24 causes the first electrode 222 to be suspended by disconnecting the first electrode 222.
  • the detecting unit 24 is disconnected from a first electrode 222, it is electrically reconnected with the previously disconnected first electrode 222.
  • the plurality of first electrodes 222 are spaced apart in the first direction, and each of the first electrodes 222 extends in the second direction.
  • the plurality of second electrodes 224 are spaced apart in the second direction, and each of the second electrodes 224 extends in the first direction.
  • the first direction is different from the second direction.
  • the first direction and the second direction are, for example but not limited to, a vertical relationship.
  • the first electrode 222 is arranged as a row electrode in the Y direction, that is, the first row, the second row, the third row, the mth row, where m is A natural number greater than 1.
  • the second electrode 224 is a column electrode and is sequentially arranged in the X direction, that is, the first column, the second column, the third column, the nth column, where n is a natural number greater than 1.
  • the intersection area between the plurality of first electrodes 222 and the plurality of second electrodes 224 forms a second coupling capacitor CF, that is, the image sensing device 200 can be formed with m*n second coupling capacitors CF (see FIG. 6). ).
  • the first direction and the second direction may also be A certain angle setting, such as 45 °, 60 °, etc.
  • the plurality of first electrodes 222 and the plurality of second electrodes 224 have a rectangular strip shape.
  • the plurality of first electrodes 222 and the plurality of second electrodes are variably 224 may also take other suitable shapes, such as curved strips and the like.
  • FIG. 4 is a schematic structural diagram of another embodiment of the sensor unit 22.
  • the plurality of first electrodes 222 are spaced apart along the first direction, and each of the first electrodes 222 includes a plurality of first sub-electrodes 222a and a wire 222b connecting the adjacent first sub-electrodes 222a.
  • the plurality of second electrodes 224 are spaced apart in the second direction, and each of the second electrodes 224 includes a plurality of second sub-electrodes 224a and a wire 224b connecting the adjacent second sub-electrodes 224a.
  • the first direction and the second direction are different, such as, but not limited to, a vertical relationship. As shown in FIG.
  • the first electrode 222 is arranged as a row electrode in the Y direction, for example, the first row, the second row, the third row, the seventh row, and the second electrode 224 serves as a column electrode in the X direction. Arrange sequentially, for example, column 1, column 2, column 3, column 8.
  • the number 56 here is only an example, and the number of actual products is more or less than 56, and the manufacturer can set according to the product requirements.
  • first direction and the second direction may be set, for example, at a certain angle, for example, 45°, 60°, or the like.
  • first electrode 222 and the second electrode 224 are in the shape of a rectangular block.
  • first electrode 222 and the second electrode 224 may also have other suitable shapes. .
  • the lengths of the first electrode 222 and the second electrode 224 shown in FIG. 4 become shorter than those of the first electrode 222 and the second electrode 224 shown in FIG.
  • first electrode 222 and the structure of the second electrode 224 in the above embodiments may be variously combined and deformed as long as the first electrode 222 and the second electrode 224 are disposed in an insulated intersection.
  • the first electrode 222 and the second electrode 224 may be made of, for example, a transparent conductive material such as an indium tin oxide (ITO) material, an indium zinc oxide (IZO) material, or the like. However, the first electrode 222 and the second electrode 224 may also be made of other suitable electrically conductive materials, such as metal materials, alloy materials, and the like. Since the first electrode 222 and the second electrode 224 are both conductive electrodes, electrical isolation is performed between the first electrode 222 and the second electrode 224 by providing an insulating material.
  • ITO indium tin oxide
  • IZO indium zinc oxide
  • the image sensing device 200 may further include a modulating unit 26 for generating a modulation signal M and outputting the modulation signal M to the detection.
  • a modulating unit 26 for generating a modulation signal M and outputting the modulation signal M to the detection.
  • Unit 24 for generating a modulation signal M and outputting the modulation signal M to the detection.
  • the signals in the detecting unit 24 are all signals modulated by the modulation signal M.
  • the excitation signal Vref and the predetermined reference voltage signal Vp are both signals modulated by the modulation signal M.
  • the detection unit 24 may also be a partial signal that is modulated by the modulation signal M.
  • the excitation signal Vref is a signal modulated by the modulation signal M.
  • the predetermined reference voltage signal Vp is a constant voltage signal.
  • the excitation signal Vref is a signal modulated by the modulation signal M
  • the signal-to-noise ratio of the image sensing device 200 can be improved, thereby improving the sensing accuracy of the image sensing device 200.
  • the excitation signal Vref varies as the modulation signal M changes. For example, the excitation signal Vref increases as the modulation signal M increases, and decreases as the modulation signal M decreases.
  • the modulating unit 26 outputs the modulation signal M to the ground terminal c (see FIG. 8) of the detecting unit 24 as a ground signal of the detecting unit 24, for example.
  • the ground signal corresponds to a varying signal.
  • the electrical signals of the detecting unit 24 use the changed ground signal as a voltage reference signal. When the local signal changes, the electrical signal in the detecting unit 24 changes with the change of the ground signal. Thus, all signals of the detecting unit 24 are signals modulated by the modulation signal M.
  • the modulating unit 26 may also output the modulation signal M to the power terminal d (see FIG. 8) or the reference power terminal (not shown) of the detecting unit 24, and may also achieve detection. The effect of modulation of all signals in unit 24 is performed.
  • the signals on the plurality of first electrodes 222 and the plurality of second electrodes 224 are all modulated signals.
  • the M-modulated signal can thereby reduce the adverse effects of lateral parasitic capacitance between adjacent first electrodes 222, lateral parasitic capacitance between adjacent second electrodes 224, and the like.
  • the signal-to-noise ratio of the excitation signal Vref can be increased, thereby improving the signal-to-noise ratio of the sensing signal Vd, thereby further improving the sensing accuracy of the image sensing device 200.
  • the image sensing device 200 may also omit the modulation unit 26.
  • the ground of the detection unit 24 is for example loaded with a constant 0 volt signal. The following mainly takes the modulation technique of the image sensing device 200 as an example. Bright.
  • FIG. 5 is a schematic cross-sectional view of the image sensing device 200 of the present application.
  • the sensor unit 22 described above may further include a substrate 220 and an insulating layer 226.
  • the plurality of second electrodes 224 are disposed on the substrate 220
  • the insulating layer 226 is disposed on the plurality of second electrodes 224
  • the plurality of first electrodes 222 are disposed on the insulating layer 226.
  • the area where the first electrode 222 and the second electrode 224 are defined is the sensing area I
  • the area on the defining substrate 220 around the sensing area I is the non-sensing area II.
  • the detecting unit 24 and the modulating unit 26 are located in the non-sensing area II of the substrate 220.
  • the detecting unit 24 and the modulating unit 26 may be connected to the substrate 220 through a connecting member such as a flexible circuit board, and the detecting unit 24 and the modulating unit 26 are not limited to be disposed on the substrate 220.
  • the substrate 220 is an insulating substrate, and is, for example, a suitable substrate such as a glass substrate or a film substrate.
  • the detecting unit 24 is integrated into a sensing chip, for example, by a silicon process
  • the modulation unit 26 is integrated into a control chip, for example, by a silicon process.
  • the detecting unit 24 and the modulating unit 26 are not limited to be integrated on one chip, and may be integrated on several chips, for example, two or three, as appropriate.
  • the sensing chip and the control chip are bonded to the substrate 220 by way of a chip on glass (COG) or a chip on film (COF).
  • COG chip on glass
  • COF chip on film
  • the detection unit 24 and the modulation unit 26 are further connected to an external circuit (not shown), for example, by a suitable connector such as a flexible circuit board.
  • the present application since the sensor unit 22 of the present application forms the first electrode 222 and the second electrode 224 on the insulating substrate 220, the present application includes the sensor unit compared to the sensor unit that forms the sensing electrode on the silicon substrate. The manufacturing cost of the image sensing device 200 of 22 is further reduced.
  • the sensor unit 22 described above may further include a protective layer 228.
  • the protective layer 228 is disposed on the plurality of first electrodes 222 and the insulating layer 266 to prevent the first electrode 222 from directly contacting the outside to damage the first electrode 222, thereby affecting the sensing effect.
  • the protective layer 228 may also be omitted in other embodiments.
  • the protective layer 228 may also be replaced with a package, and the sensor unit 22, the sensing chip, and the control chip are encapsulated in the Between the package and the substrate 220.
  • the package is used to cover the sensor unit 22, The sensing chip and the control chip, and the gap between the filling sensor unit 22, the sensing chip, and the control chip.
  • the package is, for example but not limited to, made of a material such as an epoxy resin.
  • FIG. 6 is a schematic diagram of a connection structure between the first electrode 222 and the second electrode 224 and the detecting unit 24 and the modulating unit 26.
  • a first coupling capacitance CS is formed between the target object 400 and the plurality of first electrodes 222.
  • a plurality of second coupling capacitors CF are formed between the plurality of first electrodes 222 and the plurality of second electrodes 224.
  • the first coupling capacitor CS formed between the suspended first electrode 222 and the target object 400 is connected in series with the second coupling capacitor CF between the detecting unit 24 and the ground.
  • the unsuspended first electrode 222 functions as a shield electrode due to receiving the predetermined reference voltage signal Vp, and accordingly, a first coupling capacitor CS formed between the unsuspended first electrode 222 and the target object 400 It is shielded and will not be detected by the detecting unit 24. Therefore, the first coupling capacitance CS formed between the target object and the suspended first electrode 222 is critical to the detection unit acquiring the sensing information and can be detected by the detecting unit 24.
  • the target object is the finger 400.
  • the human body is connected to the earth.
  • the first coupling capacitor CS and the second coupling capacitor CF are connected in series between the detecting unit 24 and the ground.
  • contact includes both direct touch and proximity.
  • the detection unit 24 includes a reference circuit 240, a plurality of first switches S1, and a control circuit 242.
  • the reference circuit 240 is connected to the plurality of first electrodes 222 in a one-to-one correspondence by the plurality of first switches S1.
  • the reference circuit 240 is configured to provide the predetermined reference voltage signal Vp to the plurality of first electrodes 222.
  • the control circuit 242 is connected to the plurality of first switches S1 for controlling the plurality of first switches S1 to be opened or closed. It should be noted that, in FIG. 6, since only one first electrode 222 is shown, correspondingly, only one first switch S1 is shown.
  • the detecting unit 24 controls the plurality of first switches S1 to be sequentially turned off by the control circuit 242 to control the plurality of first electrodes 222 to be suspended in sequence.
  • the control circuit 242 controls the first switch S1 to be turned off for a predetermined time, the first switch S1 that is currently turned off is closed, and the other switch is turned off again.
  • the first switch S1. Thereby, the plurality of first switches S1 are sequentially disconnected, so that The plurality of first electrodes 222 are suspended in order to realize a sensing operation.
  • the predetermined reference voltage signal Vp is a signal modulated by the modulated signal M by a constant voltage signal.
  • the predetermined reference voltage signal Vp can also be a constant voltage signal.
  • the reference circuit 240 is preferably disposed in the control chip instead of the sensing chip.
  • the reference circuit 240 is referenced to the voltage in the control chip as a system or device.
  • the signal on the system ground or device ground is typically a constant voltage signal of 0 volts.
  • the first switch S1 can be a thin film transistor switch.
  • amorphous silicon thin film transistor switches low temperature polysilicon thin film transistor switches, high temperature polysilicon thin film transistor switches, metal oxide thin film transistor switches, and the like.
  • the metal oxide thin film transistor switch is an indium gallium zinc oxide (IGZO) thin film transistor switch.
  • the gate is a control electrode for controlling on/off of the switch; the source is a first transmission electrode and is connected to the reference circuit 240; the drain is a second transmission electrode and is connected to the first electrode 222.
  • the first switch S1 may also be other suitable types of switches, such as a bipolar transistor switch.
  • the first switch S1 can also be an electromagnetic switch, such as a relay or the like.
  • the first switch S1 is a suitable type of switch such as a thin film transistor, the plurality of first switches S1 may be formed directly on the substrate 220, thereby reducing manufacturing costs.
  • the detecting unit 24 may further include a plurality of signal reading circuits 244 for connecting with the plurality of second electrodes 222.
  • the excitation signal Vref is supplied to the plurality of second electrodes 224, and the sensing signals Vd output by the plurality of second electrodes 224 are received to obtain sensing information.
  • the number of the plurality of signal reading circuits 244 is equal to the number of the second electrodes 224, and the plurality of signal reading circuits 244 are connected in one-to-one correspondence with the plurality of second electrodes 224.
  • the plurality of signal reading circuits 244 can simultaneously output the excitation signal Vref to all of the second electrodes 224, and simultaneously read all of the sensing signals Vd outputted by the second electrodes 224.
  • each of the second electrodes 224 is respectively connected to a signal reading circuit 244.
  • the number of the plurality of signal reading circuits 244 is less than the number of the plurality of second electrodes 224.
  • at least part or all of the signal reading circuit The 244 is multiplexed, and the second electrode 224 located at different positions is driven in a time division manner.
  • the detection unit 24 may further include a plurality of second switches S2.
  • the plurality of second switches S2 are connected to the plurality of second electrodes 224 in one-to-one correspondence.
  • the control circuit 242 is connected to the plurality of second switches S2 for controlling the plurality of second switches S2 to be opened or closed.
  • the number of the plurality of signal reading circuits 244 is less than the number of the plurality of second switches S2. At least part or all of the signal reading circuit 244 is respectively connected to at least two second switches S2, and the signal reading circuit 244 connecting at least two second switches S2 drives the second electrodes 224 respectively connected to the at least two second switches S2. .
  • the number of the plurality of second switches S2 is twice that of the plurality of signal reading circuits 244, and each of the signal reading circuits 244 connects the two second switches S2.
  • the control circuit 242 for example, simultaneously controls a half of the number of second switches S2 to be closed at the same time, and all of the signal reading circuits 244 simultaneously drive half of the number of second electrodes 224 by half of the closed second switch S2.
  • the plurality of signal reading circuits 244 drive all of the second electrodes 224 to perform a complete detection by two switchings.
  • the number of the plurality of signal reading circuits 244 is greatly reduced by time division multiplexing, thereby reducing the manufacturing cost of the image sensing device 200.
  • the plurality of signal reading circuits 244 are electrically connected to the plurality of second electrodes 224 in a time division manner.
  • the opening or closing of the second switch S2 is controlled by the control circuit 242, so that the plurality of signal reading circuits 244 perform time-divisional reading of the sensing signal Vd output by the second electrode 224.
  • each of the signal reading circuits 244 is connected to two second switches S2, taking the first signal reading circuit 244 located on the left side as an example.
  • the control circuit 242 first controls a second switch S2a connected to the signal reading circuit 244 and located on the left side to be closed, and controls the second switch S2b located on the right side to be disconnected; the second switch S2a to be disconnected After the sensing signal Vd of the connected second electrode 224 is read, the second circuit S2b connected to the control circuit 242 and the control signal reading circuit 244 is closed, and the second switch S2a is turned off to read The sensing signal Vd of the second electrode 224 to which the second switch S2b is connected.
  • the number of the plurality of second switches S2 is 3 of the plurality of signal reading circuits 244
  • each signal reading circuit 244 is connected to three second switches S2. Accordingly, all of the signal reading circuits 244 simultaneously drive one third of the second electrodes 224 to operate, and the switching is performed three times.
  • Signal read circuit 244 drives all of second electrodes 224 to perform a complete test.
  • the foregoing description of the number of signal reading circuits 244 is merely illustrative. However, the present application is not limited thereto, and the manufacturer may correspondingly set a corresponding number of signal reading circuits 244 according to product specifications and product quality requirements.
  • the plurality of second switches S2 are, for example, suitable switches of a thin film transistor or the like, the plurality of second switches S2 may also be disposed on the substrate 220.
  • the control circuit 242 controls the first switch S1 to be turned off, for example, row by row.
  • the control circuit 242 can also control the first switch S1 to be disconnected by interlacing.
  • the control circuit 242 first controls the first switch S1 located in the odd row to be disconnected one by one, and then controls the even row.
  • a switch S1 is disconnected one by one.
  • the control circuit 242 controls the turn-off timing of the plurality of first switches S1 not to be enumerated in the present application, as long as the control circuit 242 controls the current first switch S1 to turn off and controls the previous disconnection.
  • the first switch S1 is closed, and operating in such a controlled manner, such that all of the first switches S1 are sequentially turned off can fall within the scope of protection of the present application.
  • the reference circuit 240 of FIG. 7 has an output terminal (not shown) for outputting a predetermined reference voltage signal, and the output terminal is respectively connected to the plurality of first switches S1, thereby reducing the manufacturing cost of the capacitive sensing device 200.
  • a plurality of reference circuits may be provided, each reference circuit correspondingly outputs a predetermined reference voltage signal, and each reference signal source is connected in one-to-one correspondence with the plurality of first switches S1.
  • the reference circuit 240 includes a plurality of outputs coupled to the plurality of first switches S1.
  • the signal reading circuit 244 includes an amplifier Q and a feedback branch F.
  • the amplifier Q includes an in-phase terminal a, an inverting terminal b, a ground terminal c, a power terminal d, and an output terminal Vout
  • the feedback branch F is connected to the inverting terminal b and the output terminal Vout.
  • the inverting terminal b is further connected to the second electrode 224 through the second switch S2.
  • the non-inverting terminal a is for receiving the excitation signal Vref.
  • the ground terminal c is used to load the modulation signal M.
  • the power terminal d is used to record a power supply voltage.
  • the feedback branch F includes a feedback capacitor CB and a third switch S3. The feedback capacitor CB and the third switch S3 are connected in parallel between the inverting terminal b and the output terminal Vout.
  • the amplifier Q is in a virtual short state, and the voltages of the non-inverting terminal a and the inverting terminal are the same.
  • the excitation signal Vref is sequentially output to the second electrode 224 through the non-inverting terminal a, the inverting terminal b, and the closed second switch S2.
  • the control circuit 242 controls the plurality of first switches S1 to be sequentially turned off, and the reference circuit 240 supplies a predetermined reference voltage signal Vp to the first electrode 222 through the closed first switch S1. For example, when the finger 400 (see FIG.
  • the detecting unit 24 can acquire corresponding texture image information according to the sensing signal Vd output by the plurality of second electrodes 224.
  • the capacitive sensing device 200 performs fingerprint sensing, for example, since the fingerprint of the finger 400 includes a ridge and a valley, the first coupling capacitor CS is formed between the ridge and the suspended first electrode 222. The capacitance value is greater than the capacitance value of the first coupling capacitor CS formed between the valley and the floating first electrode 222.
  • the signal reading circuit 244 is not limited to the circuit shown in FIG. 8 of the present application, and may be other suitable types of circuits as long as the excitation signal Vref is transmitted to the second electrode 224 and the output from the second electrode 224 is received.
  • the sensing signal Vd falls within the scope of protection of the present application.
  • the detecting unit 24 of the present application may further add a circuit such as a filter circuit, an amplifying circuit, an analog-to-digital conversion circuit, and the like after the output terminal Vout.
  • a circuit such as a filter circuit, an amplifying circuit, an analog-to-digital conversion circuit, and the like after the output terminal Vout.
  • FIG. 9 is a schematic structural diagram of an embodiment of an electronic device according to the present application.
  • the electronic device 500 is, for example but not limited to, any suitable type of product such as a consumer electronics product, a home electronics product, a vehicle-mounted electronic product, or a wearable electronic product.
  • consumer electronic products such as mobile phones, tablets, notebook computers, desktop monitors, computer integrated machines and other suitable electronic products.
  • Home-based electronic products such as smart door locks, televisions, refrigerators and other suitable electronic products.
  • the vehicle-mounted electronic products are, for example, various suitable electronic products such as car navigation systems and car DVDs.
  • Wearable electronic products such as watches, bracelets, rings and other suitable electronic products.
  • the electronic device 500 includes the image sensing device 200 of any of the above embodiments.
  • the electronic device 500 can further include a display area 501 and a non-display area 502.
  • the electronic device 500 is configured to display a display screen corresponding to the display area 501 for displaying Picture, etc.
  • the non-display area 502 is located around the display area 501.
  • the front surface of the electronic device 500 includes a protective cover 503.
  • the image sensing device 200 is, for example, a small-sized image sensing module, and is disposed in the non-display area 502 of the electronic device 500, for example, at a position corresponding to the Home button. Specifically, the image sensing device 200 can be hidden under the protective cover 503. Alternatively, the image sensing device 200 can also be exposed at a through hole of the protective cover 503. In addition, the image sensing device 200 may be disposed at an appropriate position such as a side surface or a back surface of the electronic device 500.
  • the image sensing device 200 when the image sensing device 200 is an image sensing module, the image sensing device 200 may also be located in the display area 501, for example, the sensor unit 22 of the image sensing device 200 (see FIG. 3). ) is located in a partial area of the display area 501.
  • the image sensing device 200 is an image sensing module
  • the image sensing module may also perform touch sensing.
  • the sensor unit 22 (see FIG. 3) of the image sensing device 200 can also be located in the entire area of the display area 501.
  • the image sensing device 200 performs touch sensing and texture image information sensing.
  • the image sensing device 200 is configured to perform touch sensing, and a partial region is used to perform texture image information sensing.
  • the image sensing device 200 may also perform touch sensing and texture image information sensing and the like in a time division manner, and thus, the electronic device 500 may perform texture image information sensing in a full screen.

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Abstract

一种图像传感装置（200）及电子设备（500）。所述图像传感装置（200）包括传感器单元（22）和检测单元（24）。所述传感器单元（22）包括多条第一电极（222）和多条第二电极（224），所述多条第一电极（222）和所述多条第二电极（224）绝缘交叉排列。所述检测单元（24）用于提供激励信号给所述多条第二电极（224）、并控制所述多条第一电极（222）依次悬空、以及提供预定的参考电压信号给未悬空的第一电极（222），来驱动所述传感器单元（22）执行纹路信息感测。所述电子设备（500）包括上述图像传感装置（200）。

Description

图像传感装置及电子设备 技术领域
本实用新型涉及一种图像传感装置及电子设备。
背景技术
目前，图像传感装置，例如，指纹传感装置，逐渐得到普及。然，图像传感装置的成本仍然较高。
实用新型内容
本实用新型实施方式旨在至少解决现有技术中存在的技术问题之一。为此，本实用新型实施方式需要提供一种图像传感装置及电子设备。
本实用新型提供一种图像传感装置，包括：
传感器单元，包括多条第一电极和多条第二电极，所述多条第一电极和所述多条第二电极绝缘交叉排列；和
检测单元，用于提供激励信号给所述多条第二电极、并控制所述多条第一电极依次悬空、以及提供预定的参考电压信号给未悬空的第一电极，来驱动所述传感器单元执行纹路信息感测。
相对地，现有的图像传感装置包括多个矩形块状电极，所述多个矩形块状电极同层共面，彼此间隔，呈矩阵排列，每一矩形块状电极分别通过一条导线连接至检测电路。其中，每一块状电极分别对应为一感测像素点。
通过比较可以看出，由于本申请的图像传感装置包括所述多条第一电极和所述多条第二电极，且所述多条第一电极和所述多条第二电极绝缘交叉，每一交叉处则对应形成一感测像素点，因此，相较于上述现有的图像传感装置，本申请的图像传感装置在保证感测像素点足够多的情况下，所述多条第一电极和所述多条第二电极连接至检测单元的导线的数量减少，从而，可降低图像传感装置的成本。
另外，由于导线数量减少，也可利于所述图像传感装置朝小型化发展。
在某些实施方式中，所述检测单元每控制一所述第一电极悬空，对应控制其余的第一电极接收所述预定的参考电压信号。
在某些实施方式中，所述多条第一电极位于所述多条第二电极上方，所述多条第一电极用于与接触或接近所述图像传感装置的目标物体之间形成第一耦合电容，所述多条第一电极与所述多条第二电极的交叉处形成多个第二耦合电容。
在某些实施方式中，所述检测单元根据所述多条第二电极输出的感测信号来获取所述目标物体的指纹信息、掌纹信息、耳纹信息中的任意一种或几种。
在某些实施方式中，所述传感器单元进一步包括绝缘基板和绝缘层，其中，所述多条第二电极设置在所述绝缘基板上，所述绝缘层设置在所述多条第二电极上，所述多条第一电极设置在所述绝缘层上。
在某些实施方式中，所述检测单元集成在一感测芯片中，所述感测芯片设置在所述绝缘基板上。
在某些实施方式中，所述检测单元包括参考电路、多个第一开关、和控制电路；所述参考电路与所述多个开关分别连接，用于通过所述多个第一开关提供所述预定的参考电压信号给所述多条第一电极；所述多个第一开关和所述多条第一电极一一对应连接；所述控制电路用于控制所述多个第一开关的关断时序。
在某些实施方式中，当所述控制电路控制一所述第一开关断开时，则与断开的第一开关连接的第一电极处于悬空状态，而其余与闭合的第一开关相连接的第一电极则用作屏蔽电极。
在某些实施方式中，所述检测单元进一步包括多个信号读取电路，所述多个信号读取电路用于提供所述激励信号给所述多条第二电极，并接收来自第二电极输出的感测信号。
在某些实施方式中，所述检测单元进一步包括多个第二开关，所述多个信号读取电路通过所述多个第二开关与所述多条第二电极连接，所述控制电路进一步与所述多个第二开关连接，用于控制所述多个第二开关的关断与否，其中，至少部分或全部的信号读取电路分别连接至少二第二开关。
所述多条第一电极同层共面，所述多条第二电极同层共面，所述多条第一电极与所述多条第二电极位于不同层，且二者垂直交叉设置。
在某些实施方式中，所述图像传感装置进一步包括调制单元，用于产生 调制信号，并输出给所述检测单元，所述检测单元输出给所述传感器单元的信号均为经所述调制信号调制后的信号。
在某些实施方式中，所述检测单元包括接地端，所述调制电路输出所述调制信号给所述接地端，用作所述检测单元的地信号。
本实用新型还提供一种电子设备，包括上述中任意一项所述的图像传感装置。
在某些实施方式中，所述电子设备包括移动终端、智能家居产品、车载电子产品、以及可穿戴式产品。
由于所述电子设备包括所述图像传感装置，因此，所述电子设备的成本较低。
本实用新型实施方式的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本实用新型实施方式的实践了解到。
附图说明
本实用新型实施方式的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是现有的一种图像传感装置的结构示意图；
图2是本实用新型实施方式的图像传感装置的电路框图；
图3是图2中传感器单元一实施方式的结构示意图；
图4是图2中传感器单元的另一实施方式的结构示意图；
图5是本实用新型实施方式的图像传感装置的截面示意图；
图6是本实用新型实施方式的图像传感装置中第一电极和第二电极与检测单元、调制单元的连接结构示意图；
图7是本实用新型实施方式的图像传感装置中的第一电极和第二电极对应与参考电路以及信号读取电路的连接结构示意图；
图8是本实用新型实施方式的图像传感装置在执行电容感测的等效电路示意图；
图9是本实用新型实施方式的电子设备的平面示意图。
具体实施方式
下面详细描述本实用新型的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本实用新型，而不能理解为对本实用新型的限制。
在本实用新型的描述中，需要理解的是，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本实用新型的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本实用新型的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通信；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本实用新型中的具体含义。
下文的公开提供了许多不同的实施方式或例子用来实现本实用新型的不同结构。为了简化本实用新型的公开，下文中对特定例子的部件和设定进行描述。当然，它们仅仅为示例，并且目的不在于限制本实用新型。此外，本实用新型可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设定之间的关系。此外，本实用新型提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
进一步地，所描述的特征、结构可以以任何合适的方式结合在一个或更多实施方式中。在下面的描述中，提供许多具体细节从而给出对本实用新型的实施方式的充分理解。然而，本领域技术人员应意识到，没有所述特定细节中的一个或更多，或者采用其它的结构、组元等，也可以实践本实用新型的技术方案。在其它情况下，不详细示出或描述公知结构或者操作以避免模糊本实用新型。
请参阅图1，图1为现有的一种图像传感装置的结构示意图。所述图像传感装置100包括基板10、多个感测电极12、和检测电路16。所述多个感 测电极12形成在所述基板10上，且所述多个感测电极12呈二维阵列式排布，即形成传感阵列14。所述多个感测电极12同层共面，且每个感测电极12形成一感测像素点。所述检测电路16形成在基板10上，位于所述传感阵列14的外围。所述检测电路16与每个感测电极12电性连接，用于提供激励信号给各感测电极12，驱动各感测电极12执行感测操作。进一步地，所述检测电路16接收来自感测电极12输出的感测信号，并根据所述感测信号获取纹路图像信息。所述纹路图像信息例如为生物体上的合适纹路图像信息，例如但不局限为指纹图像信息、掌纹图像信息、耳纹图像信息中的一种或几种。所述生物体例如但不局限为人体，也可为其它合适的生物体。
然而，由于所述检测电路16与每个感测电极12例如通过导线一一电性连接，因此，如果感测电极12的数量较多时，将对导线的布置增加较大的难度，从而增加图像传感装置100的制作成本。另外，为满足电性要求，导线与导线之间必须具有一定的间隔，因此布置的导线越多，图像传感装置100的尺寸越大，来保证图像传感装置100的良率，从而不利于图像传感装置100的小型化发展。
尤其地，当所述图像传感装置100例如为小尺寸的图像感测模组时，上述的技术问题更加突出。一般地，小尺寸的图像感测模组被设置在例如移动终端的非显示区，例如，位于Home键的位置、位于移动终端的背面、和侧面等。然，可变更地，所述图像感测模组也可设置在例如移动终端的显示区。其中，显示区为移动终端显示图像的区域。
为至少解决上述技术问题之一，本实用新型提出一种新的图像传感装置200。请一并参阅图2与图3，图2为本实用新型的图像传感装置200的电路框图，图3为图2所示图像传感装置200的传感器单元的一实施方式的结构示意图。所述图像传感装置200可用于执行纹路信息感测。所述图像传感装置200包括传感器单元22和检测单元24。
所述传感器单元22包括多条第一电极222和多条第二电极224。所述多条第一电极222和所述多条第二电极224绝缘交叉排列。
所述检测单元24用于提供一激励信号Vref给所述多条第二电极224、并控制所述多条第一电极222依次悬空、以及一提供预定的参考电压信号Vp给未悬空的第一电极222，来驱动所述传感器单元22执行纹路信息感测。
由于本申请的图像传感装置200包括所述多条第一电极222和所述多条第二电极224，且所述多条第一电极222和所述多条第二电极224绝缘交叉，每一交叉处则对应形成一感测像素点，因此，相较于上述现有的图像传感装置，本申请的图像传感装置200在保证感测像素点足够多的情况下，所述多条第一电极222和所述多条第二电极224连接至检测单元24的导线的数量减少，从而，可降低图像传感装置200的成本。
进一步地，由于导线数量减少，也可利于所述图像传感装置200朝小型化发展。
当所述图像传感装置200执行纹路信息感测时，所述检测单元24每控制一所述第一电极222悬空，对应控制其余的第一电极222接收所述预定的参考电压信号Vp。
所述检测单元24进一步接收来自第二电极224输出的感测信号Vd，以获取纹路图像信息。
所述多条第一电极222用于以电容方式耦合至目标物体。所述图像传感装置200用于感测所述目标物体的纹路图像信息。所述纹路图像信息例如为指纹信息、掌纹信息、耳纹信息等生物体上的合适纹路信息。所述目标物体对应例如为手指、手掌、耳朵等。
所述检测单元24通过断开与第一电极222的连接，来使得所述第一电极222悬空。当所述检测单元24在断开与一条第一电极222的连接时，其与之前断开连接的第一电极222重新进行电连接。
在一些实施方式中，所述多条第一电极222沿第一方向间隔排列，且每条第一电极222沿第二方向延伸。所述多条第二电极224沿第二方向间隔排列，且每条第二电极224沿第一方向延伸。所述第一方向与所述第二方向不同。所述第一方向和第二方向例如但不局限于垂直关系。如图3所示，在本实施方式中，所述第一电极222作为行电极，在Y方向上依次排列，即第1行、第2行、第3行…第m行，其中，m为大于1的自然数。所述第二电极224作为列电极，在X方向上依次排列，即第1列、第2列、第3列…第n列，其中，n为大于1的自然数。所述多条第一电极222和多条第二电极224之间的交叉区域形成第二耦合电容CF，即该图像传感装置200可形成有m*n个第二耦合电容CF(见图6)。可变更地，第一方向和第二方向例如也可以呈 一定的夹角设置，例如45°、60°等。在本实施方式中，所述多条第一电极222和所述多条第二电极224呈矩形条状，然，可变更地，所述多条第一电极222和所述多条第二电极224也可呈其它合适的形状，例如，弯曲条状等。
请参阅图4，图4为所述传感器单元22的另一实施方式的结构示意图。所述多条第一电极222沿第一方向间隔排列，且每条第一电极222包括多个第一子电极222a和连接相邻第一子电极222a的导线222b。多条第二电极224沿第二方向间隔排列，且每条第二电极224包括多个第二子电极224a和连接相邻第二子电极224a的导线224b。第一方向和第二方向不同，例如为但不局限于垂直关系。如图4所示，第一电极222作为行电极，在Y方向上依次排列，例如第1行、第2行、第3行…第7行；第二电极224作为列电极，在X方向上依次排列，例如第1列、第2列、第3列…第8列。第一电极222和第二电极224之间的交叉区域形成第二耦合电容CF(见图6)，因此，图4所示的传感器单元22可形成有7*8＝56个第二耦合电容CF。需要说明的是，此处的个数56只是一示例，实际产品的个数多于或少于56个都是可以的，厂商可根据产品需要对应设置。可变更地，第一方向和第二方向例如也可以呈一定的夹角设置，例如为45°、60°等。在本实施方式中，所述第一电极222和第二电极224为矩形块状，然，本申请并不局限于此，所述第一电极222和第二电极224也可为其它合适的形状。相较图3所示的第一电极222和第二电极224，图4所示的第一电极222和第二电极224的长度变短。
可以理解的是，上述各实施方式中第一电极222的结构与第二电极224的结构可以进行多种组合及变形，只要第一电极222和第二电极224呈绝缘交叉设置即可。
上述第一电极222和第二电极224例如可由透明导电材料制成，所述透明导电材料例如为氧化铟锡(ITO)材料、氧化铟锌(IZO)材料等。然，可变更地，所述第一电极222和第二电极224也可由其它合适的导电材料制成，例如，金属材料、合金材料等等。由于第一电极222和第二电极224均为导电电极，因此在第一电极222和第二电极224之间通过设置绝缘材料进行电性隔离。
请再参阅图2，在一些实施方式中，所述图像传感装置200可进一步包括调制单元26，用于产生调制信号M，并输出所述调制信号M给所述检测 单元24。
可选地，所述检测单元24中的信号均为经所述调制信号M调制后的信号。例如，所述激励信号Vref和预定的参考电压信号Vp均为经过所述调制信号M调制后的信号。然，可变更地，所述检测单元24中也可是部分信号为经所述调制信号M调制后的信号。例如，所述激励信号Vref为经过所述调制信号M调制后的信号。所述预定的参考电压信号Vp为一恒定电压信号。
由于所述激励信号Vref为经过所述调制信号M调制后的信号，因此，可以提高所述图像传感装置200的信噪比，进而提高所述图像传感装置200的感测精度。
在一些实施方式中，所述激励信号Vref随所述调制信号M的变化而变化。例如，所述激励信号Vref随所述调制信号M的升高而升高、随所述调制信号M的降低而降低。
在一些实施方式中，所述调制单元26例如输出所述调制信号M给检测单元24的接地端c(见图8)，作为检测单元24的地信号。所述地信号对应为变化的信号。相应地，所述检测单元24的电信号均以所述变化的地信号作为电压参照基准信号。当地信号变化时，所述检测单元24中的电信号均随所述地信号的变化而变化。从而，所述检测单元24的所有信号均为经所述调制信号M调制后的信号。
可变更地，在其它实施方式中，所述调制单元26也可以输出调制信号M给检测单元24的电源端d(见图8)或参考电源端(图未示)等，也能够达到对检测单元24中的所有信号进行调制的效果。
由于检测单元24中的所有信号均为经所述调制信号M调制后的信号，因此，所述多条第一电极222和所述多条第二电极224上的信号均为经所述调制信号M调制后的信号，从而，可以降低相邻第一电极222之间的横向寄生电容、相邻第二电极224之间的横向寄生电容等的不利影响。另外，还可以提高激励信号Vref的信噪比，进而提高感测信号Vd的信噪比，进而进一步提高所述图像传感装置200的感测精度。
需要说明的是，在一些变更的实施方式中，所述图像传感装置200也可省略所述调制单元26。相应地，所述检测单元24的接地端例如加载恒定的0伏电压信号。下面主要以所述图像传感装置200采用调制技术为例进行说 明。
请参阅图5，图5为本申请图像传感装置200的截面示意图。在一些实施方式中，上述传感器单元22可进一步包括基板220和绝缘层226。所述多条第二电极224设置在基板220上，绝缘层226设置在多条第二电极224上，多条第一电极222设置在绝缘层226上。定义第一电极222和第二电极224所在的区域为感测区I，定义基板220上位于感测区I周围的区域为非感测区II。可选地，所述检测单元24和调制单元26位于基板220的非感测区II。然，可变更地，所述检测单元24和调制单元26也可通过例如软性电路电路板等连接件与所述基板220连接，而并非限定检测单元24和调制单元26设置在基板220上。
所述基板220为绝缘基板，例如为玻璃基板、薄膜基板等合适类型的基板。
在一些实施方式中，上述检测单元24例如通过硅工艺处理集成在一颗感测芯片中，上述调制单元26例如通过硅工艺处理集成在一颗控制芯片中。当然，所述检测单元24和调制单元26也不限定分别集成在一颗芯片上，也可以考虑合适的情况而集成在几颗芯片上，例如两颗、三颗等。所述感测芯片和控制芯片例如通过玻璃上芯片(Chip On Glass,COG)的方式或覆晶薄膜(Chip On Film，COF)的方式绑定(Bonding)在基板220上。所述检测单元24和调制单元26进一步例如通过柔性电路板等合适的连接件连接至外部电路(图未示)。
由于本申请的传感器单元22为在绝缘基板220上形成第一电极222与第二电极224，因此，相较于在硅基板上形成感测电极的传感器单元而言，本申请包含所述传感器单元22的图像传感装置200的制造成本进一步降低。
请再参阅图5，在一些实施方式中，上述传感器单元22可进一步包括保护层228。所述保护层228设置在所述多条第一电极222以及绝缘层266上，以避免所述第一电极222与外界直接接触而损坏第一电极222，从而影响感测效果。然，可变更地，在其它实施方式中，所述保护层228也可被省略。另外，例如，当图像传感装置200为小尺寸的图像感测模组时，所述保护层228也可被替换为封装体，所述传感器单元22、感测芯片和控制芯片封装在所述封装体和所述基板220之间。所述封装体用于包覆所述传感器单元22、 感测芯片和控制芯片，以及填充传感器单元22、感测芯片和控制芯片之间的间隙。所述封装体例如但不局限为由环氧树脂等材料制成。
请一并参阅图5与图6，图6为第一电极222和第二电极224与检测单元24和调制单元26的连接结构示意图。当有目标物体400接触所述图像传感装置200的感测区I时，所述目标物体400与所述多条第一电极222之间形成第一耦合电容CS。另外，所述多条第一电极222与所述多条第二电极224之间形成多个第二耦合电容CF。其中，悬空的第一电极222与目标物体400之间形成的第一耦合电容CS是和第二耦合电容CF串联连接于检测单元24与大地之间。相对地，未悬空的第一电极222由于接收所述预定的参考电压信号Vp，则用作屏蔽电极，相应地，未悬空的第一电极222与目标物体400之间形成的第一耦合电容CS被屏蔽掉，不会被检测单元24所检测到。因此，目标物体与悬空的第一电极222之间形成的第一耦合电容CS对检测单元获取感测信息是关键的，能够被检测单元24所检测到。在本实施方式中，所述目标物体为手指400。
一般地，人体与大地连接。相应地，当目标物体例如为人体的手指400时，则所述第一耦合电容CS与第二耦合电容CF相当于串联连接于检测单元24与大地之间。
需要说明的是，在本申请中，词语“接触”包括直接触摸和接近这两种情况。
在一些实施方式中，所述检测单元24包括参考电路240、多个第一开关S1、和控制电路242。所述参考电路240通过所述多个第一开关S1与所述多条第一电极222一一对应连接。所述参考电路240用于提供所述预定的参考电压信号Vp给所述多条第一电极222。所述控制电路242与所述多个第一开关S1连接，用于控制所述多个第一开关S1断开或闭合。需要说明的是，在图6中，由于只示出一条第一电极222，相应地，仅示出一第一开关S1。
所述检测单元24通过所述控制电路242控制所述多个第一开关S1依次断开，来实现控制所述多条第一电极222依次悬空。
在图像传感装置200执行感测时，当所述控制电路242控制所述第一开关S1断开达预定的时间之后，闭合当前断开的第一开关S1，并再断开另一个闭合的第一开关S1。从而，实现依次断开所述多个第一开关S1，使得所 述多条第一电极222依次悬空，进而实现感测操作。
在一些实施方式中，该预定的参考电压信号Vp为一恒定电压信号经过调制信号M调制后的信号。然，可变更地，该预定的参考电压信号Vp也可为一恒定电压信号。其中，当该预定的参考电压信号Vp为恒定电压信号时，所述参考电路240优选设置在所述控制芯片而非感测芯片中。所述参考电路240在所述控制芯片中是以系统地或设备地为电压参照基准。所述系统地或设备地上的信号一般为0伏的恒定电压信号。
在某些实施方式中，第一开关S1可以为薄膜晶体管开关。例如非晶硅薄膜晶体管开关、低温多晶硅薄膜晶体管开关、高温多晶硅薄膜晶体管开关、金属氧化物薄膜晶体管开关等等。其中金属氧化物薄膜晶体管开关如为氧化铟镓锌(IGZO)薄膜晶体管开关。相应地，栅极为控制电极，用于控制开关的通/断；源极为第一传输电极，并与参考电路240连接；漏极为第二传输电极，并与第一电极222连接。然，可变更地，在其它实施方式中，该第一开关S1也可以为其它合适类型的开关，如，双极型三极管开关。当然，该第一开关S1还可以为电磁开关，例如继电器等。例如，当第一开关S1为薄膜晶体管等合适类型的开关时，所述多个第一开关S1可以直接在基板220上形成，从而降低了制作成本。
请再参阅图6，在一些实施方式中，所述检测单元24可进一步包括多个信号读取电路244，所述多个信号读取电路244用于与所述多条第二电极222连接，提供激励信号Vref给所述多条第二电极224，并接收所述多条第二电极224输出的感测信号Vd，以获取感测信息。在本实施方式中，所述多个信号读取电路244的数量等于第二电极224的数量，所述多个信号读取电路244与所述多条第二电极224一一对应连接。所述多个信号读取电路244能够同时输出激励信号Vref给所有的第二电极224，并同时将所有的第二电极224输出的感测信号Vd一次读完。
需要说明的是，在图6中，由于只示出一条第二电极224，因此，为了清楚明了，所述检测单元24中也只示出一个信号读取电路244。然，实际上，每一第二电极224对应分别连接一信号读取电路244。
可变更地，在另一些实施方式中，所述多个信号读取电路244的数量少于所述多条第二电极224的数量。相应地，至少部分或全部的信号读取电路 244被复用，分时驱动位于不同位置的第二电极224工作。
在某些变更实施方式中，如图7所示，该检测单元24可进一步包括多个第二开关S2。所述多个第二开关S2与所述多条第二电极224一一对应连接。所述控制电路242与所述多个第二开关S2连接，用于控制所述多个第二开关S2断开或闭合。所述多个信号读取电路244的个数少于所述多个第二开关S2的个数。至少部分或全部的信号读取电路244分别连接至少二第二开关S2，连接至少二第二开关S2的信号读取电路244分时驱动与该至少二第二开关S2分别连接的第二电极224。
在图7所示的实施方式中，所述多个第二开关S2的数量是所述多个信号读取电路244的两倍，每一信号读取电路244连接两个第二开关S2。相应地，所述控制电路242例如每次同时控制一半数量的第二开关S2闭合，所有的信号读取电路244每次通过一半数量闭合的第二开关S2同时驱动一半数量的第二电极224工作，通过两次切换，所述多个信号读取电路244驱动所有的第二电极224执行完一次完整检测。如此，通过分时复用，使得所述多个信号读取电路244的个数大大减少，从而降低了图像传感装置200的制造成本。
工作时，当所述检测单元24依次断开与多条第一电极222的连接时，所述多个信号读取电路244分时与所述多条第二电极224电连接。通过所述控制电路242控制第二开关S2的断开或闭合，使得所述多个信号读取电路244对第二电极224输出的感测信号Vd进行分时读取。如图7所示，每个信号读取电路244均连接两个第二开关S2，以其中位于左侧的第一个信号读取电路244为例，在进行感测信号Vd的读取时，所述控制电路242先控制与该信号读取电路244相连接的、且位于左侧的一个第二开关S2a闭合，并控制位于右侧的第二开关S2b断开；待与该第二开关S2a连接的第二电极224的感测信号Vd被读取后，所述控制电路242再控制信号读取电路244连接的另一个第二开关S2b闭合，第二开关S2a断开，以读取与该第二开关S2b连接的第二电极224的感测信号Vd。
需要说明的是，为了清楚区分，与位于左侧的第一个信号读取电路244相连接的二第二开关S2在此被分别标示为S2a和S2b。
再例如，所述多个第二开关S2的数量是所述多个信号读取电路244的3 倍，每一信号读取电路244连接三个第二开关S2，相应地，所有的信号读取电路244每次同时驱动三分之一的第二电极224工作，通过三次切换，所述多个信号读取电路244驱动所有的第二电极224执行完一次完整检测。本申请前述对信号读取电路244的数量只是举例说明，然，本申请并不以此为限，厂商可根据产品规格以及产品品质等需求，对应设置相应数量的信号读取电路244即可。
当所述多个第二开关S2例如为薄膜晶体管等合适类型的开关时，所述多个第二开关S2也可设置在基板220上。
请一并参阅图6与图7，所述控制电路242例如逐行控制第一开关S1断开。然，可变更地，所述控制电路242也可隔行控制第一开关S1断开，比如，所述控制电路242先控制位于奇数行的第一开关S1逐个断开，然后再控制偶数行的第一开关S1逐个断开。所述控制电路242控制所述多个第一开关S1的关断时序不受本申请在此列举的方式，只要控制电路242在控制当前的第一开关S1断开时，并控制前一断开的第一开关S1闭合，按如此控制方式操作，能够实现控制所有的第一开关S1依次断开的这种方式，都应落入本申请的保护范围。
图7中参考电路240具有一输出端(未标示)，以输出预定的参考电压信号，且该输出端分别连接多个第一开关S1，从而降低了电容式传感装置200的制造成本。然，可变更地，也可以设置多个参考电路，每个参考电路对应输出预定的参考电压信号，且每个参考信号源与多个第一开关S1一一对应连接。又或者，所述参考电路240包括多个输出端，所述多个输出端与所多个第一开关S1连接。
请一并参阅图7和图8，在一些实施方式中，所述信号读取电路244包括放大器Q和反馈支路F。其中，所述放大器Q包括同相端a、反相端b、接地端c、电源端d、和输出端Vout，所述反馈支路F连接在所述反相端b和所述输出端Vout之间，所述反相端b进一步通过第二开关S2连接第二电极224。所述同相端a用于接收激励信号Vref。所述接地端c用于加载所述调制信号M。所述电源端d用于记载一电源电压。所述反馈支路F包括反馈电容CB和第三开关S3，反馈电容CB和第三开关S3并联连接于所述反相端b与输出端Vout之间。
工作时，所述放大器Q处于虚短状态，所述同相端a与反相端的电压相同。相应地，所述激励信号Vref依次通过同相端a、反相端b、和闭合的第二开关S2输出给第二电极224。同时，所述控制电路242(见图6)控制所述多个第一开关S1依次断开，所述参考电路240通过闭合的第一开关S1提供预定的参考电压信号Vp给第一电极222。例如当有手指400(见图6)接近悬空的第一电极222时，由于手指400与悬空的第一电极222之间形成的第一耦合电容CS与第二耦合电容CF串接在信号读取电路244与大地之间，而未悬空的第一电极222用作屏蔽电极，因此，所述多条第二电极224对应输出的感测信号Vd会有差别。其中，所述第二电极224用于通过所述反馈支路F输出相应的感测信号Vd给输出端Vout。从而，所述检测单元24能够根据所述多条第二电极224输出的感测信号Vd获取相应的纹路图像信息。
需要说明的是，当所述电容式传感装置200例如执行指纹感测时，由于手指400的指纹包括脊和谷，因此，脊和悬空的第一电极222之间形成第一耦合电容CS的电容值大于谷和悬空的第一电极222之间形成第一耦合电容CS的电容值。
所述信号读取电路244并不限于本申请图8所示的电路，也可为其它合适类型的电路，只要能够实现传输激励信号Vref给第二电极224，并接收来自第二电极224输出的感测信号Vd即均落在本申请的保护范围。
另外，本申请的检测单元24中可选择进一步在输出端Vout之后增加滤波电路、放大电路、模数转换电路等电路。
请参阅图9，图9为本申请的电子设备的一实施方式的结构示意图。所述电子设备500例如但不局限于消费性电子产品、家居式电子产品、车载式电子产品、或穿戴式电子产品等任何合适类型的产品。其中，消费性电子产品例如为手机、平板电脑、笔记本电脑、桌面显示器、电脑一体机等各类合适的电子产品。家居式电子产品例如为智能门锁、电视、冰箱等各类合适的电子产品。车载式电子产品例如如为车载导航仪、车载DVD等各类合适的电子产品。穿戴式电子产品例如为手表、手环、戒指等各类合适的电子产品。
所述电子设备500包括上述任一实施方式的图像传感装置200。
在某些实施方式中，所述电子设备500可进一步包括显示区501和非显示区502。其中，所述电子设备500对应显示区501设置显示屏，用于显示 画面等。非显示区502位于显示区501周围。通常地，所述电子设备500的正面包括保护盖板503。
所述图像传感装置200例如为小尺寸的图像感测模组，设置在所述电子设备500的非显示区502，例如设置在Home键对应的位置。具体地，所述图像传感装置200可隐藏于保护盖板503的下方。可变更地，所述图像传感装置200也可曝露在保护盖板503的一通孔处。另外，所述图像传感装置200也可设置在电子设备500的侧面或背面等合适的位置。
进一步地，当所述图像传感装置200为图像感测模组时，所述图像传感装置200也可位于显示区501，例如，所述图像传感装置200的传感器单元22(见图3)位于显示区501的局部区域。
需要说明的是，当所述图像传感装置200为图像感测模组时，所述图像感测模组也可执行触摸感测。
所述图像传感装置200的传感器单元22(见图3)也可位于显示区501的全部区域。可选地，所述图像传感装置200执行触摸感测与纹路图像信息感测。例如，所述图像传感装置200用于执行触摸感测，且局部区域用于执行纹路图像信息感测。又例如，所述图像传感装置200也可为分时执行触摸感测与纹路图像信息感测等等，如此，所述电子设备500可全屏执行纹路图像信息感测。
在本说明书的描述中，参考术语“一个实施方式”、“某些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“一些示例”等的描述意指结合所述实施方式或示例描述的具体特征、结构、材料或者特点包含于本实用新型的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
尽管上面已经示出和描述了本实用新型的实施方式，可以理解的是，上述实施方式是示例性的，不能理解为对本实用新型的限制，本领域的普通技术人员在本实用新型的范围内可以对上述实施方式进行变化、修改、替换和变型。

Claims (15)

  1. 一种图像传感装置，其特征在于：包括：
    传感器单元，包括多条第一电极和多条第二电极，所述多条第一电极和所述多条第二电极绝缘交叉排列；和
    检测单元，用于提供一激励信号给所述多条第二电极、并控制所述多条第一电极依次悬空、以及提供一预定的参考电压信号给未悬空的第一电极，来驱动所述传感器单元执行纹路信息感测。
  2. 如权利要求1所述的图像传感装置，其特征在于：所述检测单元每控制一所述第一电极悬空，对应控制其余的第一电极接收所述预定的参考电压信号。
  3. 如权利要求1所述的图像传感装置，其特征在于：所述多条第一电极位于所述多条第二电极上方，所述多条第一电极用于与接触或接近所述图像传感装置的目标物体之间形成第一耦合电容，所述多条第一电极与所述多条第二电极的交叉处形成多个第二耦合电容。
  4. 如权利要求3所述的图像传感装置，其特征在于：所述检测单元根据所述多条第二电极输出的感测信号来获取所述目标物体的指纹信息、掌纹信息、耳纹信息中的任意一种或几种。
  5. 如权利要求3所述的图像传感装置，其特征在于：所述传感器单元进一步包括绝缘基板和绝缘层，其中，所述多条第二电极设置在所述绝缘基板上，所述绝缘层设置在所述多条第二电极上，所述多条第一电极设置在所述绝缘层上。
  6. 如权利要求5所述的图像传感装置，其特征在于：所述检测单元集成在一感测芯片中，所述感测芯片设置在所述绝缘基板上。
  7. 如权利要求1所述的图像传感装置，其特征在于：所述检测单元包括参考电路、多个第一开关、和控制电路；所述参考电路与所述多个开关分别连接，用于通过所述多个第一开关提供所述预定的参考电压信号给所述多条第一电极；所述多个第一开关和所述多条第一电极一一对应连接；所述控制电路用于控制所述多个第一开关的关断时序。
  8. 如权利要求7所述的图像传感装置，其特征在于：当所述控制电路 控制一所述第一开关断开时，则与断开的第一开关连接的第一电极处于悬空状态，而其余与闭合的第一开关相连接的第一电极则用作屏蔽电极。
  9. 如权利要求7所述的图像传感装置，其特征在于：所述检测单元进一步包括多个信号读取电路，所述多个信号读取电路用于提供所述激励信号给所述多条第二电极，并接收来自第二电极输出的感测信号。
  10. 如权利要求9所述的图像传感装置，其特征在于：所述检测单元进一步包括多个第二开关，所述多个信号读取电路通过所述多个第二开关与所述多条第二电极连接，所述控制电路进一步与所述多个第二开关连接，用于控制所述多个第二开关的关断与否，其中，至少部分或全部的信号读取电路分别连接至少二第二开关。
  11. 如权利要求1所述的图像传感装置，其特征在于：所述多条第一电极同层共面，所述多条第二电极同层共面，所述多条第一电极与所述多条第二电极位于不同层，且二者垂直交叉设置。
  12. 如权利要求1-11中任意一项所述的图像传感装置，其特征在于：所述图像传感装置进一步包括调制单元，用于产生调制信号，并输出给所述检测单元，所述检测单元输出给所述传感器单元的信号均为经所述调制信号调制后的信号。
  13. 如权利要求12所述的图像传感装置，其特征在于：所述检测单元包括接地端，所述调制电路输出所述调制信号给所述接地端，用作所述检测单元的地信号。
  14. 一种电子设备，包括权利要求1-13中任意一项所述的图像传感装置。
  15. 如权利要求14所述的电子设备，其特征在于：所述电子设备包括移动终端、智能家居产品、车载电子产品、以及可穿戴式产品。
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