CN106415600B

CN106415600B - Biological information sensing device and electronic apparatus

Info

Publication number: CN106415600B
Application number: CN201680000681.9A
Authority: CN
Inventors: 李问杰
Original assignee: Shenzhen Sunwave Technology Co Ltd
Current assignee: Liuzhou Zibo Technology Co.,Ltd.
Priority date: 2016-08-09
Filing date: 2016-08-09
Publication date: 2020-05-19
Anticipated expiration: 2036-08-09
Also published as: WO2018027592A1; CN106415600A

Abstract

The invention provides a biological information sensing device and an electronic apparatus. The biological information sensing device comprises a plurality of sensing electrodes which are arranged in a plurality of rows and a plurality of columns; a driving circuit connected to the plurality of sensing electrodes for driving the plurality of sensing electrodes to perform bio-information sensing; for the same column of sense electrodes: when the driving circuit provides the excitation signal to one sensing electrode to perform biological information sensing, a first reference signal is provided to part or all of the rest sensing electrodes.

Description

Biological information sensing device and electronic apparatus

Technical Field

The present invention relates to the field of biological information sensing technologies, and in particular, to a biological information sensing device and an electronic device having the same.

Background

At present, a biometric information sensing device is gradually becoming a standard of electronic equipment, for example, more and more mobile terminals employ a fingerprint sensing device, a face recognition sensing device, an eye print recognition sensing device, and the like. Generally, the biological information sensing device includes a plurality of sensing electrodes arranged in an array and a driving circuit connected to each of the sensing electrodes. The driving circuit generally drives the sensing electrodes row by row to perform biological information sensing.

However, for the same column of sense electrodes: when the driving circuit provides an excitation signal to a sensing electrode to drive the sensing electrode to perform biological information sensing, the driving circuit does not provide a voltage signal to the other sensing electrodes, and the voltages on the other sensing electrodes are inconsistent due to signal interference and other influences, so that parasitic influences on the sensing electrode performing the biological information sensing are different and unknown, and the biological information sensing device has a relatively high requirement on sensing precision, thereby being not beneficial to accurate detection of biological information.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the present invention is to provide a biological information sensing device and an electronic apparatus.

The present invention provides a biological information sensing device, including:

the sensing electrodes are arranged in a plurality of rows and columns;

a driving circuit connected to the plurality of sensing electrodes for driving the plurality of sensing electrodes to perform bio-information sensing;

for the same column of sense electrodes: when the driving circuit provides the excitation signal to one sensing electrode to perform biological information sensing, a first reference signal is provided to part or all of the rest sensing electrodes.

Optionally, the first reference signal is the same as the excitation signal.

Optionally, for the same row of sense electrodes: when the driving circuit provides the excitation signal to one sensing electrode to perform the biological information sensing, a second reference signal is provided to the other sensing electrode.

Optionally, the second reference signal is the same as the first reference signal.

Optionally, for the same row of sense electrodes: the driving circuit simultaneously provides the excitation signal to a part of the sensing electrodes to perform the biological information sensing, and provides the second reference signal to a part or all of the rest sensing electrodes.

Optionally, for the same row of sense electrodes: the driving circuit simultaneously drives a part of the sensing electrodes each time to perform biological information sensing by driving a plurality of times until driving of one row of the sensing electrodes is completed to perform biological information sensing.

Optionally, when the driving circuit is providing the excitation signal to the sensing electrode, the driving circuit further receives a sensing signal output from the sensing electrode to perform self-capacitance type biological information sensing.

Optionally, the biological information sensing apparatus includes a plurality of sensing units, the sensing units including:

the sensing electrode;

a first control switch connected with the sensing electrode; and

a second control switch connected with the sensing electrode;

the drive circuit includes:

the scanning driving circuit is respectively connected with the first control switch and the second control switch in the plurality of sensing units and is used for driving the first control switch and the second control switch in the same sensing unit to be conducted in a time-sharing mode;

the sensing driving circuit is connected with the sensing electrode through the first control switch and is used for providing the excitation signal to the sensing electrode through the conducted first control switch to perform biological information sensing; and

and the reference signal generating circuit is connected with the sensing electrode through the second control switch and is used for providing the first reference signal to the sensing electrode through the conducted second control switch.

Optionally, for the same column of sense electrodes:

when the scanning driving circuit drives the first control switch in one of the sensing units to be switched on and the second control switch in the other sensing unit to be switched on, the first control switch driving part or all of the sensing units in the other sensing units to be switched off and the second control switch in the other sensing units to be switched on, and the reference signal generating circuit provides the first reference signal to the sensing electrode through the switched-on second control switch.

Optionally, the sensing driving circuit provides the excitation signal to the sensing electrode through the turned-on first control switch to perform biological information sensing, and receives a sensing signal output from the sensing electrode to acquire biological information.

Alternatively, when the scanning driving circuit drives the first control switches of one row of sensing units to be turned on and the second control switches to be turned off, the sensing driving circuit simultaneously provides the excitation signals to some of the sensing electrodes through the turned-on first control switches to perform bio-information sensing, and the reference signal generating circuit provides the same second reference signals to the sensing electrodes of some or all of the remaining sensing units through the turned-on first control switches.

Optionally, the driving circuit further includes a plurality of data selectors, the plurality of data selectors are connected to the reference signal generating circuit and the sensing driving circuit, each data selector is further connected to a sensing electrode of a part of the sensing units through a first control switch, and the data selector is configured to selectively output the excitation signal or the second reference signal to the sensing electrode.

Optionally, the driving circuit outputs the excitation signal to one sensing electrode to perform biological information sensing through each data selector at a time, and outputs the second reference signal to some or all of the other sensing electrodes in the same row through each data selector.

Optionally, the biological information sensing apparatus further includes a control unit, connected to the scan driving circuit and the plurality of data selectors, respectively, for controlling turn-on timings of the scan driving circuit driving the first control switch and the second control switch in each row of sensing units, and controlling timings of outputting the excitation signal and the second reference signal to the sensing electrodes by controlling the plurality of data selectors.

Optionally, the biological information sensing apparatus further comprises:

a plurality of scan line groups including a first scan line and a second scan line; and

a plurality of data line groups including a first data line and a second data line;

each scanning line group is connected with one row of sensing units, and each data line group is connected with one row of sensing units;

the first control switch includes a control electrode, a first transmission electrode, and a second transmission electrode; the second control switch includes a control electrode, a first transmission electrode, and a second transmission electrode; the first scanning line is connected with the scanning driving circuit and the control electrode of the first control switch; the second scanning line is connected with the scanning driving circuit and the control electrode of the second control switch; the first data line is connected with the data selector and a first transmission electrode of the first control switch; the second data line is connected with the reference signal generating circuit and a first transmission electrode of a second control switch; the second transmission electrode of the first control switch is connected with the sensing electrode; the second transmission electrode of the second control switch is connected with the sensing electrode.

Optionally, the first data line is configured to transmit the excitation signal and the second reference signal, the second data line is configured to transmit the first reference signal, the scan driving circuit provides a scan start signal to the first control switch and the second control switch through the first scan line and the second scan line to control the first control switch and the second control switch to be turned on, and provides a scan stop signal to the first control switch and the second control switch through the first scan line and the second scan line to control the first control switch and the second control switch to be turned off.

Optionally, the biological information sensing apparatus further comprises:

a first reference signal line connected to the reference signal generating circuit and the second data line for transmitting the first reference signal;

a second reference signal line connected to the reference signal generating circuit and the plurality of data selectors, for transmitting the second reference signal; and

and the sensing signal line is connected with the sensing driving circuit and the plurality of data selectors and is used for transmitting the excitation signal to the sensing electrode and transmitting the sensing signal from the sensing electrode to the sensing driving circuit.

Optionally, the biological information sensing apparatus includes a biological information sensor including an insulating substrate, the plurality of sensing units, the plurality of scanning line groups, the plurality of data line groups, and the first reference signal line being formed on the insulating substrate.

Optionally, the first control switch and the second control switch in each sensing unit are both thin film transistor switches, and the insulating substrate is a glass substrate.

Optionally, the sensing unit includes a first control switch and a second control switch, or the sensing unit includes two first control switches connected in parallel and two second control switches connected in parallel.

Optionally, the insulating substrate includes a first surface for receiving a touch or proximity input of a target object and a second surface disposed opposite to the first surface, and the plurality of sensing units, the plurality of scanning line groups, the plurality of data line groups, and the first reference signal line are disposed on the second surface.

Optionally, the sensing electrodes of the plurality of sensing units are closer to the second surface than the first control switch, the second control switch, the plurality of scanning line groups, and the plurality of data line groups.

Optionally, the first control switch, the second control switch, the plurality of scanning line groups, and the plurality of data line groups are located on a side of the sensing electrodes of the plurality of sensing units facing away from the insulating substrate.

Optionally, the sensing electrodes of the plurality of sensing units cover the first control switch, the second control switch, the plurality of scanning line groups, and the plurality of data line groups.

Optionally, the biological information sensor further includes the scan driving circuit, the plurality of data selectors, the second reference signal line, and the sensing signal line, and the scan driving circuit, the plurality of data selectors, the second reference signal line, and the sensing signal line are formed on a second surface of the insulating substrate.

Alternatively, the scan driving circuit, the plurality of data selectors, the second reference signal line, and the sensing signal line are disposed around the plurality of sensing units.

Optionally, the scan driving circuit and the plurality of data selectors each include a control switch, and the control switches are all thin film transistor switches.

Optionally, each data selector includes a plurality of switch units, each switch unit includes a first selection switch and a second selection switch, the first selection switch includes a control electrode, a first transmission electrode, and a second transmission electrode, the second selection switch includes a control electrode, a first transmission electrode, and a second transmission electrode, wherein the control electrode of the first selection switch and the control electrode of the second selection switch are respectively connected to the control unit, the first transmission electrode of the first selection switch is connected to the sensing driving circuit, the first transmission electrode of the second selection switch is connected to the reference signal generating circuit, and the second transmission electrode of the first selection switch and the second transmission electrode of the second selection switch are connected to a first data line.

Optionally, the control unit controls the first selection switch and the second selection switch in the same switch unit to be turned on in a time-sharing manner.

Optionally, the biological information sensor further includes a passivation layer formed on the plurality of sensing units, the plurality of scanning line groups, the plurality of data line groups, and the first reference signal line.

Optionally, the biological information sensing apparatus further comprises a control chip including the control unit, the reference signal generating circuit, and the sensing driving circuit.

Optionally, the biological information sensor and the control chip are bare chips respectively, and the control chip is bound on the insulating substrate; or the control chip is arranged on a flexible circuit board and is electrically connected with the biological information sensor through the flexible circuit board.

Optionally, the driving circuit further includes a modulation circuit, and the modulation circuit is configured to uniformly modulate signals output by the driving circuit to the plurality of sensing units, so as to improve a signal-to-noise ratio of the sensing signal.

Optionally, the biological information sensing device is a self-capacitance type sensing device.

Optionally, the biometric information sensing device is a fingerprint sensing device.

The biological information sensing device further provides the first reference signal to part or all of the sensing electrodes in the rest sensing electrodes in the same column while driving the sensing electrodes to sense the biological information, so that the parasitic influence of the sensing electrodes applied with the first reference signal on the sensing electrodes performing sensing is known, and accordingly, the driving circuit can eliminate the known parasitic influence in the process of acquiring the biological information, thereby improving the accuracy of biological information sensing.

Further, the biological information sensing apparatus provides a second reference signal to some or all of the sensing electrodes in the remaining sensing electrodes in the same row when driving some of the sensing electrodes in each row of sensing electrodes to perform biological information sensing, so that the parasitic influence of the sensing electrode applied with the second reference signal on the sensing electrode performing sensing is known, and accordingly, the driving circuit can eliminate the known parasitic influence in the process of acquiring biological information, thereby improving the accuracy of biological information sensing.

Optionally, the biological information sensing device further includes an insulating substrate, a plurality of sensing units, and a protective cover plate, the sensing units are disposed between the insulating substrate and the protective cover plate, and a side of the protective cover plate opposite to the sensing units is configured to receive a touch or proximity input of a target object, where each sensing unit includes one sensing electrode and a sensing circuit connected to the sensing electrode.

Optionally, the biological information sensing device further includes an insulating substrate, a plurality of sensing units, and a coating layer, the sensing units are disposed between the insulating substrate and the coating layer, and a side of the coating layer opposite to the sensing units is configured to receive a touch or proximity input of a target object, wherein each sensing unit includes a sensing electrode and a sensing circuit connected to the sensing electrode.

Optionally, the sensing circuit includes a first control switch and a second control switch, and the first control switch and the second control switch are both connected to the sensing electrode, where the first control switch is used to control whether to transmit the excitation signal to the sensing electrode, the second control switch is used to control whether to transmit the first reference signal to the sensing electrode, and the first control switch and the second control switch are turned on in a time-sharing manner.

The present invention further provides an electronic device including the biological information sensing apparatus according to any one of the above.

Because the electronic equipment comprises the biological information sensing device, the user experience of the electronic equipment is high.

Drawings

Fig. 1 is a schematic circuit diagram of a biological information sensing device according to an embodiment of the present invention.

Fig. 2 is a plan view of a partial structure of the biological information sensing apparatus shown in fig. 1.

Fig. 3 is a schematic circuit configuration diagram of an embodiment of a data selection circuit of the biological information sensing apparatus shown in fig. 1.

Fig. 4 is a schematic structural view of another embodiment of the biological information sensing device according to the present invention.

Fig. 5 is a schematic partial sectional view of the biological information sensing device shown in fig. 4.

Fig. 6 is a state diagram of the usage of the biological information sensing apparatus shown in fig. 4.

Fig. 7 is a flowchart illustrating a method of manufacturing the biometric information sensor shown in fig. 3 according to an embodiment.

FIG. 8 is a flowchart of a method for manufacturing the first control switch and the second control switch.

Fig. 9 is a partial schematic structural view of still another embodiment of the biological information sensing device according to the present invention.

Fig. 10 is a plan view of another embodiment of a sensing unit of the biological information sensing apparatus according to the present invention.

Fig. 11 is a partial schematic structural view of a biological information sensing device according to still another embodiment of the present invention.

Fig. 12 is a schematic structural diagram of an embodiment of an electronic device according to the invention.

Fig. 13 is a circuit configuration block diagram of an embodiment of the electronic device shown in fig. 12.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The thickness and size of each layer shown in the drawings may be exaggerated, omitted, or schematically shown for convenience or clarity, and the number of relevant elements may be schematically shown. In addition, the size of an element does not completely reflect an actual size, and the number of related elements does not completely reflect an actual number. There may be instances where the number of identical or similar or related elements in various figures may be non-uniform, e.g., due to differing figure sizes. The same reference numbers in the drawings identify the same or similar structures. It should be noted, however, that in order to make the reference numbers regular and logical, in some different embodiments, the same or similar elements or structures are given different reference numbers, and those skilled in the art can directly or indirectly determine the relationship according to the technical relevance and the related text.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.

Further, the following terms are exemplary and are not intended to be limiting in any way. After reading this application, those skilled in the art will recognize that these terms apply to techniques, methods, physical elements, and systems (whether currently known or not), including extensions thereof that may be inferred or inferred by those skilled in the art after reading this application.

In the description of the present invention, it is to be understood that: the terms "plurality" and "a plurality" include two and more than two, and the terms "plurality" and "a plurality" include two and more than two, unless the invention is specifically limited otherwise. "at least two columns" includes an increasing variety of suitable conditions such as two columns, three columns, four columns, five columns, etc. In addition, the terms such as "first", "second", and the like in the names of the elements and the names of the signals do not limit the sequence of the elements or the signals, but are used for facilitating the naming of the elements and the signals and clearly distinguishing the elements and the signals, so that the description is more concise.

Next, each embodiment of the present invention will be explained.

Referring to fig. 1 and 2 together, fig. 1 is a schematic circuit diagram of a biological information sensing device according to an embodiment of the present invention. Fig. 2 is a plan view of a partial structure of the biological information sensing apparatus shown in fig. 1. The biological information sensing apparatus 1 includes a plurality of sensing electrodes 111 and a driving circuit 20. The driving circuit 20 is connected to the sensing electrodes 111, and is used for driving the sensing electrodes 111 to perform biological information sensing. The biological information sensing device 1 is, for example, a fingerprint sensing device, an ear print sensing device, or other suitable types of sensing devices.

The biological information sensing device 1 is, for example, a capacitive biological information sensing device, and may be any other suitable type of biological information sensing device.

Generally, a capacitive sensing device includes a mutual capacitive sensing device and a self capacitive sensing device.

The biological information sensing device 1 may be a self-capacitance type biological information sensing device or a mutual capacitance type biological information sensing device, depending on the fitting relationship of the driving circuit 20 and the sensing electrode 111.

In a mutual capacitance-based bio-information sensing device, the mutual capacitance-based bio-information sensing device may include a plurality of driving electrodes and a plurality of sensing electrodes. A mutual capacitance is formed between each driving electrode and a sensing electrode. In sensing, the drive circuit provides an excitation signal to the drive electrodes and receives a sense signal from the output of the sense electrodes. When the target object approaches or touches the biological information sensing device, the charge amount of the mutual capacitance formed between the driving electrode and the sensing electrode changes correspondingly, so that the sensing electrode outputs a corresponding sensing signal to the driving circuit, and further, related biological information is acquired.

In a self-capacitance based biological information sensing apparatus, the self-capacitance type biological information sensing apparatus includes a plurality of sensing electrodes. Each sense electrode may form a capacitance to ground. In sensing, the drive circuit provides excitation signals to the sense electrodes and receives sense signals from the outputs of the sense electrodes. When the target object approaches or touches the biological information sensing device, capacitance is formed between the target object and the sensing electrode, and the change of the charge amount on the sensing electrode is caused, so that the sensing electrode outputs a corresponding sensing signal to the driving circuit, and further, related biological information is acquired.

The target object is, for example, a suitable part of a human body such as a finger, a toe, an ear, etc., but the present invention is not limited thereto, and the target object may be other suitable objects, not limited to a human body, and may be other living bodies, even prostheses.

In the present embodiment, the biological information sensing device 1 is, for example, a self-capacitance type sensing device.

The sensing electrodes 111 are arranged in a plurality of rows and columns. However, alternatively, in other embodiments, the sensing electrodes 111 may be arranged in other regular or irregular manners.

For the same column of sense electrodes 111: when the driving circuit 20 provides the excitation signal to one sensing electrode 111 to perform the biological information sensing, a first reference signal is provided to some or all of the remaining sensing electrodes 111. Preferably, the driving circuit 20 provides the first reference signal to all the remaining sensing electrodes 111.

Since the driving circuit 20 provides the first reference signal to the remaining part or all of the sensing electrodes 111 when providing the excitation signal to one of the sensing electrodes 111 in each column of sensing electrodes 111, the parasitic influence of the sensing electrode 111 to which the first reference signal is applied to the sensing electrode 111 performing the sensing of the biological information is known, and thus, the driving circuit 20 can cancel the known parasitic influence in the subsequent calculation of the biological information, thereby improving the sensing accuracy of the biological information.

The first reference signal is, for example, a constant voltage signal.

Alternatively, the voltage difference between the first reference signal and the excitation signal is kept unchanged, for example, the first reference signal is the same as the excitation signal, thereby reducing the charge and discharge capacity of the parasitic capacitance between the remaining sensing electrodes 111 and the sensing electrode 111 performing the sensing of the biological information, further improving the sensing accuracy of the biological information.

In the present embodiment, the driving circuit 20 drives the sensing electrodes 111 row by row to perform biological information sensing. However, alternatively, in other embodiments, the driving circuit 20 may also simultaneously drive multiple rows of sensing electrodes 111 at a time to perform biological information sensing.

Further, in the present embodiment, for the sensing electrodes 111 of the same row: the driving circuit 20 simultaneously provides the excitation signal to a part of the sensing electrodes 111 to perform bio-information sensing, and provides a second reference signal to a part or all of the remaining sensing electrodes 111. Preferably, the second reference signal is provided to all the remaining sensing electrodes 111.

For the same row of sense electrodes 111: the driving circuit 20 performs the bio-information sensing by simultaneously providing the excitation signal to a part of the sensing electrodes 111 a plurality of times in sequence, thereby driving the sensing electrodes 111 of the last row to perform the bio-information sensing.

When the sensing electrodes 111 are formed on a chip, a time-sharing driving manner for a row of sensing electrodes 111 is adopted, so that the number of pins on the chip can be reduced, which will be described later.

However, alternatively, in other embodiments, the driving circuit 20 may also simultaneously drive the sensing electrodes 111 of one row to perform the biological information sensing. For example, the plurality of sensing electrodes 111 are formed in the display screen. When the plurality of sensing electrodes 111 are disposed on the chip, the driving circuit may also simultaneously drive the sensing electrodes 111 of one row to each perform biological information sensing.

In addition, since the driving circuit 20 provides the second reference signal to some or all of the remaining sensing electrodes 111 when providing the excitation signal to some of the sensing electrodes 111 in each row of sensing electrodes 111, the parasitic influence of the sensing electrode 111 to which the second reference signal is applied to the sensing electrode 111 performing the biological information sensing is known, and thus, the driving circuit 20 can counteract the known parasitic influence in the subsequent calculation of the biological information, thereby improving the sensing accuracy of the biological information.

The second reference signal is, for example, a constant voltage signal.

Alternatively, the voltage difference between the second reference signal and the excitation signal is kept unchanged, for example, the second reference signal is the same as the excitation signal, thereby reducing the charge and discharge capacity of the parasitic capacitance between the remaining sensing electrodes 111 and the sensing electrode 111 performing the sensing of the biological information, further improving the sensing accuracy of the biological information.

In some embodiments, the biological information sensing apparatus 1 includes a plurality of sensing units 11. Each sensing unit 11 includes one sensing electrode 111, a first control switch 113, and a second control switch 115. The first control switch 113 and the second control switch 115 are both connected to the sensing electrode 111.

The driving circuit 20 includes a scanning driving circuit 21, a sensing driving circuit 22, and a reference signal generating circuit 23. The scan driving circuit 21 is connected to the first control switch 113 and the second control switch 115 of the plurality of sensing units 11, respectively, and is configured to drive the first control switch 113 and the second control switch 115 of each sensing unit 11 to be turned on in a time-sharing manner. The sensing driving circuit 22 is connected to the sensing electrode 111 through the first control switch 113 in each sensing unit 11, and is used for providing the excitation signal to the sensing electrode 111 through the turned-on first control switch 113 to perform biological information sensing. The reference signal generating circuit 23 is connected to the sensing electrode 111 through the second control switch 115 in each sensing unit 11, and is configured to provide the first reference signal to the sensing electrode 111 through the turned-on second control switch 115.

For the same column of sense electrodes 111: when the scan driving circuit 21 drives the first control switch 113 in one of the sensing units 11 to be turned on and the second control switch 115 to be turned off, the first control switch 113 driving some or all of the sensing units 11 in the remaining sensing units 11 to be turned off and the second control switch 115 to be turned on, and the reference signal generating circuit 23 provides the first reference signal to the sensing electrode 111 through the turned-on second control switch 115.

The sensing driving circuit 22 provides the excitation signal to the sensing electrode 111 through the turned-on first control switch 113 to perform bio-information sensing, and receives a sensing signal output from the sensing electrode 111 to acquire bio-information.

Further, when the scan driving circuit 21 drives the first control switch 113 of one row of sensing units 11 to be turned on and the second control switch 115 to be turned off, the sensing driving circuit 22 simultaneously provides the excitation signal to a part of the sensing electrodes 111 through the turned-on first control switch 113 to perform bio-information sensing, and the reference signal generating circuit 23 provides the second reference signal to the sensing electrodes 111 of some or all of the remaining sensing units 11 through the turned-on first control switch 113.

In this embodiment, the driving circuit 20 may further include a data selection circuit 24, and the data selection circuit 24 is connected to the sensing driving circuit 22 and the reference signal generating circuit 23, respectively. The data selection circuit 24 is further connected to the first control switch 113 in each sensing unit 11. For each sensing unit 11, whether to output the second reference signal provided by the reference signal generating circuit 23 or to output the excitation signal provided by the sensing driving circuit 22 to the sensing electrode 111 is selected by the data selecting circuit 24. When the data selection circuit 24 outputs the excitation signal to a sensing electrode 111, a sensing signal sensed by the sensing electrode 111 is further output to the driving circuit 20.

Since the driving circuit 20 is provided with the data selection circuit 24, it is possible to perform biological information sensing on the sensing electrodes 111 of each row in a time-sharing manner.

In one embodiment, the data selection circuit 24 includes a plurality of data selectors (multiplexers) 241. Each data selector 241 is connected to a part of the sensing unit 11, and is further connected to the reference signal generating circuit 23 and the sensing driving circuit 22, respectively. The plurality of data selectors 241 are used for selectively outputting the excitation signal or the second reference signal to the sensing electrodes 111. Optionally, each data selector 241 is connected to at least two columns of sensing units 11.

The driving circuit 20 simultaneously outputs the excitation signal to one sensing electrode 111 through each data selector 241 at a time to perform biological information sensing, and outputs the second reference signal to some or all of the remaining sensing electrodes 111 in the same row through each data selector 241.

The driving circuit 20 outputs the excitation signal to the sensing electrodes 111 through the data selectors 241 and the turned-on first control switch 113 several times to drive the sensing electrodes 111 in one row to perform the biological information sensing.

Alternatively, in other embodiments, the data selection circuit 24 may have other suitable circuit structures, and is not limited to the plurality of data selectors 241 described herein. In addition, when the driving circuit 20 simultaneously provides the excitation signals to the sensing electrodes 111 of each row, the data selection circuit 24 may also be omitted.

The driving circuit 20 may further include a control unit 30. The control unit 30 is connected to the scan driving circuit 21 and the plurality of data selectors 241, respectively, and is configured to control the turn-on timing of the scan driving circuit 21 driving the first control switch 113 and the second control switch 115 in each row of the sensing units 11, and control the timing of outputting the excitation signal and the second reference signal to the sensing electrode 111 by controlling the plurality of data selectors 241.

For example, the control unit 30 controls the scan driving circuit 21 to turn on the first control switches 113 row by row, and controls the second control switches 115 of the sensing units 11 of a part of or all of the remaining rows to be turned on when controlling the first control switches 113 of the sensing units 11 of each row to be turned on. For the same sensing unit 11: the control unit 30 controls the scan driving circuit 21 to turn on the first control switch 113 and the second control switch 115 in a time-sharing manner.

The control unit 30 controls the data selector 241 to output the excitation signal to each sensing unit 11 connected to the data selector 241 in a time-sharing manner.

In some embodiments, the biological information sensing apparatus 1 further includes, for example, a plurality of scanning line groups B and a plurality of data line groups D. Each scanning line group B is connected to a row of sensing units 11, and each data line group D is connected to a column of sensing units 11.

Specifically, each scan line group B includes a first scan line B1 and a second scan line B2. Each data line group D includes a first data line D1 and a second data line D2.

The first control switch 113 includes a control electrode G1, a first transfer electrode S11, and a second transfer electrode S12. The second control switch 115 includes a control electrode G2, a first transfer electrode S21, and a second transfer electrode S22. The first scan line B1 connects the scan driving circuit 21 and the control electrode G1 of the first control switch 113. The second scan line B2 connects the scan driving circuit 21 and the control electrode G2 of the second control switch 115. The first data line D1 connects the data selector 241 and the first transfer electrode S11 of the first control switch 113. The second data line D2 connects the reference signal generating circuit 23 and the first transfer electrode S21 of the second control switch 115. The second transmission electrode S12 of the first control switch 113 is connected to the sensing electrode 111. The second transmission electrode S22 of the second control switch 115 is connected to the sensing electrode 111.

The first data line D1 is used for transmitting the excitation signal and the second reference signal, the second data line D2 is used for transmitting the first reference signal, the scan driving circuit 21 provides a scan on signal to the first control switch 113 and the second control switch 115 through the first scan line B1 and the second scan line B2 to control the first control switch 113 and the second control switch 115 to be turned on, and provides a scan off signal to the first control switch 113 and the second control switch 115 through the first scan line B1 and the second scan line B2 to control the first control switch 113 and the second control switch 115 to be turned off.

The first scanning line B1 and the second scanning line B2 extend in the row direction and are arranged in the column direction. The first data line D1 and the second data line D2 each extend in a column direction and are arranged in a row direction.

In some embodiments, the biological information sensing apparatus 1 further includes, for example, a first reference signal line R1, a second reference signal line R2, and a sensing signal line L. The first reference signal line R1 is connected to the reference signal generating circuit 23 and the second data line D2 for transmitting the first reference signal. The second reference signal line R2 is connected to the reference signal generating circuit 23 and the plurality of data selectors 241, and is used for transmitting the second reference signal. The sensing signal line L connects the sensing driving circuit 22 and the plurality of data selectors 241 for transmitting the excitation signal to the sensing electrode 111 and transmitting the sensing signal from the sensing electrode 11 to the sensing driving circuit 22.

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

Referring to fig. 3, fig. 3 is a circuit diagram illustrating an embodiment of the data selector 241 shown in fig. 1 according to the present invention. The data selector 241 includes 8 switching units 243, and each switching unit 243 includes a first selection switch S1 and a second selection switch S2. The first selection switch S1 includes a control electrode G3, a first transfer electrode S31, and a second transfer electrode S32. The second selection switch S2 includes a control electrode G4, a first transfer electrode S41, and a second transfer electrode S42. The control unit 30 is connected to the control electrode G3 and the control electrode G4 of each switch unit 243. The first transfer electrode S31 is connected to the sensing drive circuit 22. The first transfer electrode S41 is connected to the reference signal generation circuit 23. The second transmission electrode S32 and the second transmission electrode S42 in each switching unit 243 are connected and connected to the first transmission electrode S11 of the first control switch 113.

For the same switching unit 243: the control unit 30 controls the first selection switch S1 and the second selection switch S2 to be turned on in a time-sharing manner, that is, when the first selection switch S1 is turned on, the second selection switch S2 is turned off, and when the second selection switch S2 is turned on, the first selection switch S1 is turned off. For the same data selector 241: when the control unit 30 controls the first selection switch S1 of one switch unit 243 to be turned on and the second selection switch S2 to be turned off, the first selection switches S1 of the remaining switch units 243 are controlled to be turned off and the second selection switches S2 are controlled to be turned on. Through the turned-on first selection switch S1, the sensing driving circuit 22 provides the excitation signal to the sensing electrode 111 of the sensing unit 11 where the first control switch 113 is turned on; the reference signal generating circuit 23 provides the second reference signal to the sensing electrode 111 of the sensing cell 11 where the second control switch 115 is turned on through the turned-on second selection switch S2.

In the present embodiment, the number of the plurality of data selectors 241 is, for example, 16, and each data selector 241 includes 8 switch units 243. Correspondingly, the number of the sensing electrodes 111 of the same row is 128.

It should be noted that, in fig. 1, the size is limited by the size of the drawing, fig. 1 only shows that each data selector 241 is connected to two rows of sensing units 11, and if the structure of the data selector 241 shown in fig. 3 corresponds, fig. 1 actually omits the structure that each data selector 241 is connected to six other rows of sensing units 11. The configuration of fig. 4 described later corresponds to the configuration shown in fig. 1, and similarly, a configuration in which each data selector 241 is connected to six other rows of sensing units 11 is omitted, and a description thereof will be made.

Accordingly, the driving circuit 20 simultaneously outputs 16 excitation signals corresponding to 16 sensing electrodes 111 of the same row and simultaneously outputs 112 second reference signals corresponding to 112 sensing electrodes 111 of the same row, for example, through the 16 data selectors 241 at a time.

Taking the biological information sensing apparatus 1 as a fingerprint sensing apparatus as an example, when a finger of a user approaches or touches the sensing electrodes 111 of the sensing units 11, because distances between the ridges and the valleys and the sensing electrodes 111 are different, capacitances respectively formed by the ridges and the valleys and the sensing electrodes 111 are correspondingly different, so that the influence on the charge amount on the sensing electrodes 111 is different, and the driving circuit 20 can obtain corresponding fingerprint information according to the sensing signal output by the sensing electrodes 111.

The operation principle of the embodiment of the biological information sensing apparatus 1 is as follows.

The control unit 30 controls the first selection switch S1 of one switch unit 243 in each data selector 241 to be turned on and the second selection switch S2 to be turned off, and controls the first selection switches S1 of the remaining switch units 243 in each data selector 241 to be turned off and the second selection switches S2 to be turned on, accordingly, the sensing driving circuit 22 provides the pumping signal to the first data line D1 through the turned-on first selection switches S1 in each data selector 241, and the reference signal generating circuit 23 provides the second reference signal to the first data line D1 through the turned-on second selection switches S2 in each data selector 241. By the control of the control unit 30, the first selection switch S1 in each switch unit 243 in each data selector 241 is turned on in a time-sharing manner.

The control unit 30 controls the scan driving circuit 21 to drive the first control switch 113 to be turned on and the second control switch 115 to be turned off line by line, and controls the first control switch 113 of each row to be turned on and the second control switch 115 to be turned off, and controls the first control switch 113 of the remaining row to be turned off and the second control switch 115 to be turned on, accordingly, the excitation signal on the first data line D1 is output to the sensing electrode 111 through the turned-on first control switch 113, and receives the sensing signal output from the sensing electrode 111 to perform the bio-information sensing, the second reference signal on the first data line D1 is output to the sensing electrode 111 through the turned-on first control switch 113, and in addition, the reference signal generating circuit 23 provides the first reference signal to the sensing electrode 111 through the turned-on second control switch 115.

The sensing accuracy of biological information of the biological information sensing apparatus 1 is improved by supplying the first reference signal and the second reference signal to the remaining respective sensing electrodes 111 each time the partial sensing electrodes 111 are driven to perform biological information sensing.

Referring to fig. 1, 4 to 6, fig. 4 is a schematic structural diagram of another embodiment of the biological information sensing device according to the present invention. Fig. 5 is a schematic partial sectional view of the biological information sensing device shown in fig. 4. Fig. 6 is a state diagram of the usage of the biological information sensing apparatus shown in fig. 4. The biological information sensing apparatus 1 includes a biological information sensor 2. The biological information sensor 2 includes an insulating substrate 2a, the plurality of sensing units 11, the plurality of scanning line groups B, the plurality of data line groups D, and the first reference signal line R1. The plurality of sensing units 11, the plurality of scan line groups B, the plurality of data line groups D, and the first reference signal line R1 are formed on the insulating substrate 2 a.

In the present embodiment, the first control switch 113 and the second control switch 115 in each sensing unit 11 are, for example, Thin Film Transistor (TFT) switches, and the insulating substrate 2a is, for example, a glass substrate, so that the bioinformation sensor 2 is manufactured by a process of forming TFT switches on a glass substrate, thereby reducing the manufacturing cost of the bioinformation sensor 2 and the bioinformation sensor 2. When the first control switch 113 and the second control switch 115 are tft switches, the control electrodes G1 and G2 are gates, the first transfer electrodes S11 and S21 are sources, and the second transfer electrodes S12 and S22 are drains.

However, the present invention is not limited to the insulating substrate 2a being a glass substrate, and may also be another suitable type of insulating substrate, and similarly, the first control switch 113 and the second control switch 115 are not limited to being both tft switches, and may also be another suitable type of switches.

The thin film transistor switch may be, for example, a Low Temperature Polysilicon (LTPS) thin film transistor switch, an Indium Gallium Zinc Oxide (IGZO) thin film transistor switch, an amorphous silicon thin film transistor switch, or any other suitable type of thin film transistor switch. Preferably, the thin film transistor switch is a low temperature polysilicon thin film transistor switch.

The insulating substrate 2a includes a first surface a1 and a second surface a2 disposed opposite to the first surface a1, the first surface a1 is for receiving a touch or proximity input of a target object, and the plurality of sensing units 11, the plurality of scan line groups B, the plurality of data line groups D, and the first reference signal line R1 are disposed on the second surface a 2.

The sensing electrodes 111 of the sensing units 11 are closer to the second surface a2 than the first control switch 113, the second control switch 113, the plurality of scanning line groups B, and the plurality of data line groups D.

The first control switch 113, the second control switch 115, the plurality of scanning line groups B, and the plurality of data line groups D are located at a side of the sensing electrodes 111 of the plurality of sensing units 11 facing away from the insulating substrate 2 a.

Preferably, the sensing electrodes 111 of the sensing units 11 cover the first control switch 113, the second control switch 115, the plurality of scanning line groups B, and the plurality of data line groups D.

The biological information sensor 1 further includes a passivation layer 16, the passivation layer 16 being disposed on the plurality of sensing cells 11, the plurality of scan line groups B, the plurality of data line groups D, and the first reference signal line R1.

The passivation layer 16 serves to planarize the surface of the biological information sensor 2 and protect the plurality of sensing units 11 and the like.

Referring to fig. 5 and 7 together, fig. 7 is a flowchart of a method for manufacturing the embodiment of the biological information sensor 2. The method of manufacturing the biological information sensor 2 is as follows.

F1: providing an insulating substrate 2 a;

the insulating substrate 2a is, for example, a glass substrate.

F2: forming the plurality of sensing electrodes 111 on the insulating substrate 2 a;

the sensing electrode 111 is made of, for example, a metal material. However, the sensing electrode 111 may alternatively be made of other suitable conductive materials, for example, the sensing electrode 111 may also be made of transparent conductive materials, such as indium tin oxide, indium zinc oxide, and the like. In addition, the sensing electrode can also be made of molybdenum, lithium, molybdenum and other alloy materials.

F3: forming a first insulating layer 12 on the sensing electrodes 111;

the first insulating layer 12 is made of, for example, silicon oxide, silicon nitride, or the like.

F4: forming a first control switch 113 and a second control switch 115 on the first insulating layer 12, and forming a via H penetrating to the sensing electrode 111 on the first insulating layer 12, through which the first control switch 113 and the second control switch 115 are connected to the sensing electrode 111;

the first control switch 113 and the second control switch 115 of each sensing unit 11 are formed above the sensing electrode 111 and are respectively connected with the sensing electrode 111 through a via H.

F5: a passivation layer 16 is formed on the first control switch 113 and the second control switch 115.

The biological information sensor 2 is completed. In the above manufacturing method, the steps of forming the plurality of scan line groups B, the plurality of data line groups D, and the first reference signal line R1 are omitted.

The manufacturing process of the biological information sensor 2 formed by the manufacturing method is simple, and a protective cover plate or a Coating layer (Coating layer) does not need to be additionally arranged, so that the manufacturing cost can be saved.

Alternatively, in another embodiment, the method for manufacturing the biological information sensor 2 may include: the first control switch 113 and the second control switch 115 of each sensing cell 11 are formed on the insulating substrate 2a, then the sensing electrode 111 is formed on the first control switch 113 and the second control switch 115 of each sensing cell 11, and then a protective cover or a Coating layer (Coating layer) is formed on the sensing electrode 111. As such, this is also possible. Note that the description of the steps of the plurality of scan line groups B, the plurality of data line groups D, and the first reference signal line R1 is also omitted here.

With continuing reference to fig. 5 and with reference to fig. 8, fig. 8 is a flowchart of a method for manufacturing the first control switch 113 and the second control switch 115. The following describes a manufacturing method of forming the first control switch 113 and the second control switch 115 in the manufacturing process of the biological information sensor 2, taking the first control switch 113 and the second control switch 115 as amorphous silicon thin film transistors as an example.

F41: forming a control electrode G1 of the first control switch 113 and a control electrode G2 of the second control switch 115 on the first insulating layer 12;

f42: forming a second insulating layer 13 on the first insulating layer 12 and the control electrodes G1 and G2;

the second insulating layer 13 is made of, for example, silicon oxide, silicon nitride, or the like.

F43: forming active layers 14 and 15 on the second insulating layer 13;

the active layers 14, 15 are amorphous silicon layers.

F44: forming a via H penetrating to the sensing electrode 111 on the second insulating layer 13 and the first insulating layer 12;

it should be noted that step F4 and step F5 may be combined in the same step, but may be formed in two different steps.

F45: a first transmission electrode S11 and a second transmission electrode S12 of the first control switch 113, a first transmission electrode S21 and a second transmission electrode S22 of the second control switch 115 are formed on the second insulating layer 13, and the second transmission electrode S12 and the second transmission electrode S22 fill the via hole H to connect with the sensing electrode 111 respectively.

The first and second transfer electrodes S11 and S12 are positioned at both sides of the active layer 14, and the first and second transfer electrodes S21 and S22 are positioned at both sides of the active layer 15, thereby forming the first and second control switches 113 and 115.

In this embodiment, the second transmission electrode S12 of the first control switch 113 and the second transmission electrode S22 of the second control switch 115 are connected to the sensing electrode 111 through a via H, respectively. However, in other embodiments, the second transmission electrode S12 of the first control switch 113 and the second transmission electrode S22 of the second control switch 115 in the same sensing unit 11 may be connected to the sensing electrode 111 through the same via H.

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

The first control switch 113 and the second control switch 115 formed in the above-mentioned manufacturing method are mainly Bottom-Gate (Bottom-Gate) thin film transistors, however, the first control switch 113 and the second control switch 115 may also be Top-Gate (Top-Gate) thin film transistors, such as low-temperature polysilicon thin film transistors.

It should be further noted that the connection traces of the plurality of scan line groups B, the plurality of data line groups D, the first reference signal line R1, the first control switch 113, and the second control switch 115 are finally connected to the peripheral trace (not labeled) formed on the second surface a2 of the insulating substrate 2a, for example, by vias, so as to perform signal transmission with the corresponding circuits in the aforementioned driving circuit 20 or the control chip 3.

Optionally, the biological information sensor 2 further includes the scan driving circuit 21, the plurality of data selectors 241, the second reference signal line R2, and the sensing signal line L. The scan driving circuit 21, the plurality of data selectors 241, the second reference signal line R2, and the sensing signal line L are formed on the second surface a2 of the insulating substrate 2 a.

The scan driving circuit 21, the plurality of data selectors 241, the second reference signal line R2, and the sensing signal line L are disposed around the plurality of sensing cells 11.

The first selection switch S1 and the second selection switch S2 of the data selector 241 are both thin film transistor switches, for example. The scan driving circuit 21 generally includes a plurality of control switches (not shown), and the plurality of control switches are, for example, thin film transistor switches. Accordingly, the plurality of data selectors 241 and the scan driving circuit 21 are formed together through the same or similar manufacturing process when the first control switch 113 and the second control switch 115 are formed, thereby improving the integration of the biological information sensor 2 and reducing the manufacturing cost.

In some embodiments, the biological information sensing apparatus 1 includes a control chip 3, and the control chip 3 includes the control unit 30, the reference signal generating circuit 23, and the sensing driving circuit 22. That is, the configuration in which a part of the above-described driving circuit 20 is formed in the control chip 3 and a part thereof is formed on the biological information sensor 2 can improve the integration of the biological information sensing apparatus 1, reduce the volume of the biological information sensing apparatus 1, and reduce the manufacturing cost of the biological information sensing apparatus 1.

Alternatively, the biological information sensor 2 and the control Chip 3 are, for example, a bare Chip (Die), respectively, and the control Chip 3 is disposed on the insulating substrate 2a by, for example, Flip-Chip (Flip-Chip). When the insulating substrate 2a is, for example, a Glass substrate, the control Chip 3 is bonded (bonded) On the Glass substrate by, for example, a Chip On Glass (COG) method. When the insulating substrate 2a is, for example, a Film substrate, the control Chip 3 is bound to the Film substrate by, for example, a Chip On Film (COF) method. However, the control chip 3 may also be formed on the insulating substrate 2a by other suitable processes, and is not limited to the flip chip process described herein.

After the control Chip 3 is disposed on the insulating substrate 2a of the biological information sensor, the control Chip 3 and the biological information sensor 1 are placed in a mold, and a package (not shown) is formed on the biological information sensor 2 and the control Chip 3, for example, by an injection Molding (Molding) process, thereby forming a Chip (Chip). The package body is made of, for example, an epoxy resin material, but is not limited to the epoxy resin material, and may be made of other suitable materials. However, alternatively, after the control chip 3 is disposed on the insulating substrate 2a of the biological information sensor, the packaging process may not be performed.

The first surface a1 of the insulating substrate 2a is used to receive an approach or touch input of a target object when the biological information sensing device 1 is formed, or in other words, the first surface a1 is closer to the target object than the second surface a2 when a user senses biological information using the biological information sensing device 1.

In other embodiments, the scan driving circuit 21, the data selecting circuit 24, the second reference signal line R2, and the sensing signal line L may not be disposed on the insulating substrate 2 a. For example, the scan driver circuit 21 and the data selection circuit 24 may be provided in the control chip 3, or may be provided in another chip, or may be provided in a circuit other than a chip.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a biological information sensing device according to another embodiment of the invention. The biological information sensing device 1 further comprises a connecting piece 4, wherein the connecting piece 4 is used for connecting the control chip 3 and the biological information sensor 2. The connection member 4 is, for example, a Flexible Printed Circuit Board (FPCB). The control chip 3 is disposed on the flexible printed circuit 4, for example, and is connected to the biological information sensor 2 through the flexible printed circuit 4. Through the flexible circuit board 4, signal transmission is performed between the biological information sensor 2 and the control chip 3.

In this embodiment, the biological information sensor 2 and the control Chip 3 may be both a Chip (Chip), or the biological information sensor 2 is a bare Chip and the control Chip 3 is a Chip, or both the biological information sensor 2 and the control Chip 3 are bare chips.

In each of the above embodiments, when the biological information sensor 2 is a bare chip or a chip, the data selection circuit 24 is provided to output the excitation signal to the sensing electrodes 111 in the same row in a time-sharing manner according to the control. Since each data selector 241 of the data selection circuit 24 is respectively provided with a port (not shown) connected to the sensing driving circuit 22, the port is used for transmitting an excitation signal or a sensing signal, and correspondingly, a connection pin (not shown) is provided on the biological information sensor 2 corresponding to each port for connecting the port and the sensing driving circuit 22. In this manner, the number of connection pins between the biological information sensor 2 and the control chip 3 can be reduced.

Alternatively, in other embodiments, for example, the biological information sensor 2 may be formed in or on the display screen, rather than integrated as a bare chip or a chip. When the biological information sensor 2 is formed in or on a display screen, the control chip 3 may simultaneously drive a row of the sensing electrodes 111 to perform biological information sensing.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a sensing unit according to another embodiment of the invention. The sensing unit 11 includes two first control switches 113 connected in parallel and two second control switches 115 connected in parallel.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a biological information sensing device according to another embodiment of the present invention. The driving circuit 20 is connected to each sensing electrode 111 through a separate data line L1, and the first control switch 113 and the second control switch 115 are omitted. Accordingly, it is also possible that the driving circuit 20 outputs the corresponding signals to the sensing electrodes 111, respectively.

Referring to fig. 12, fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the invention. The electronic device 9 includes the biological information sensing apparatus 1 according to any of the above embodiments. The electronic device 9 is, for example, a portable electronic product, a home-based electronic product, or a vehicle-mounted electronic product. However, the electronic device is not limited to the electronic products listed here, and may be other suitable types of electronic products. The portable electronic product is, for example, a mobile terminal, and the mobile terminal is, for example, a mobile phone, a tablet computer, a notebook computer, a wearable product, and the like. The household electronic product is suitable for a smart door lock, a television, a refrigerator, a desktop computer and the like. The vehicle-mounted electronic product is suitable vehicle-mounted electronic products such as a vehicle-mounted display, a vehicle event data recorder, a navigator and a vehicle-mounted refrigerator.

Taking the electronic device 9 as a mobile phone as an example, the biological information sensing device 1 is disposed at any suitable position such as the front, side, and back of the mobile phone, and the biological information sensing device 1 may be disposed to expose the housing of the mobile phone or disposed inside the mobile phone. In this embodiment, the biological information sensing apparatus 1 is provided on the front surface of the cellular phone.

Based on the biological information sensed by the biological information sensing apparatus 1, the electronic device 9 performs, for example, user identity authentication, online payment, quick start Application (APP), and the like.

Since the electronic device 9 includes the biological information sensing apparatus 1, the sensing accuracy of the biological information sensing apparatus 1 is high, and therefore, the user experience of the electronic device 9 is good.

Referring to fig. 13, fig. 13 is a circuit block diagram of an embodiment of the electronic device shown in fig. 12. The electronic device 9 further comprises a main control chip 5. The main control chip 5 is connected with the biological information sensing device 1 and is used for carrying out data communication with the biological information sensing device 1. The main control chip 5 is, for example, a single chip or a chip set. When the main control chip 5 is a chipset, the chipset includes an Application Processor (AP) and a power chip. In addition, the chipset may further include a memory chip. When the main control chip 5 is a single chip, the main control chip 5 is, for example, an application processor. Further, the application processor may be replaced by a Central Processing Unit (CPU).

The main control chip 5 includes a ground terminal 50, and the ground terminal 50 is connected to a device ground and receives a ground signal of the device ground, where the ground signal is represented by GND in fig. 9. The device ground is also called system ground, and is, for example, the negative pole of a power supply of the electronic device 9, such as a battery. The ground signal GND is also called a system ground voltage, a system ground signal, a device ground voltage, a device ground signal, or the like. The ground signal GND is a constant voltage as a reference voltage for each circuit in the electronic device 9, and is, for example, a voltage signal such as 0V (volt), 2V, (-1) V, or the like. Typically, the facility ground is not the earth's or absolute earth. However, when the electronic device 9 is connected to the earth's earth by a conductor, the device ground may also be the earth's earth.

In the foregoing embodiments, the biological information sensing apparatus 1 may use one domain as a voltage reference. The domain is a domain referenced to the ground signal GND. The ground signal GND serves as a voltage reference of each circuit in the biological information sensing apparatus 1.

In order to improve the signal-to-noise ratio of the sensing signal of the biological information sensing apparatus 1, the present invention further proposes to utilize a modulation scheme to achieve the technical purpose of improving the signal-to-noise ratio, wherein the modulation scheme is suitable for the biological information sensing apparatus 1 according to the above embodiments.

For example, the technical scheme of the modulation ground is used to achieve uniform modulation of the signal output to the sensing unit 11.

Specifically, the driving circuit 20 further includes, for example, a first ground terminal 31, a second ground terminal 32, a modulation circuit 33, and a voltage generation circuit 34. The modulation circuit 33 is connected between the first ground terminal 31 and the second ground terminal 32. The modulation circuit 33 is further connected to the voltage generation circuit 34. The first ground terminal 31 is connected to the device ground. The voltage generating circuit 34 is used for providing a voltage driving signal to the modulating circuit 33. The modulation circuit 33 generates a modulation signal MGND to the second ground 32 according to the voltage driving signal and the ground signal GND on the device ground. The modulation signal MGND is used to uniformly modulate signals output from the driving circuit 20 to the sensing unit 11, such as the first reference signal, the second reference signal, the excitation signal, the scan-on signal, and the scan-off signal. Wherein the ground (e.g., the second ground terminal 32) to which the modulation signal MGND is applied is a modulation ground.

For example, the excitation signal includes a first voltage signal and a second voltage signal. The excitation signal is a square wave pulse signal with a first voltage signal and a second voltage signal which are alternately changed. The first voltage signal is lower than the second voltage signal, and the first voltage signal is, for example, a ground signal GND. The modulation signal MGND is used to raise the second voltage signal to improve the signal-to-noise ratio of the sensing signal.

When the driving circuit 20 receives the sensing signal output from the sensing electrode 111, the sensing signal needs to be inversely modulated to acquire the corresponding biological information.

In this embodiment, the biological information sensing apparatus 1 is a voltage reference based on two domains. The two domains are shown as domain 60 referenced to ground signal GND and domain 70 referenced to modulated signal MGND, respectively. The ground terminals of the circuits in the domain 60 with reference to the ground signal GND are all directly connected to the device ground, and the ground terminals of the circuits in the domain 70 with reference to the modulated signal MGND are all directly connected to the modulated ground. Further, for a circuit with the modulation ground as ground, the reference ground thereof is the modulation signal MGND loaded with the modulation ground; for a circuit with the device ground as ground, the ground signal GND applied to the device ground is referenced to ground potential.

In the present embodiment, the control unit 30, the scan driving circuit 21, the data selection circuit 24, the reference signal generation circuit 23, and the sensing unit 11 are provided in a field 70, for example. The sense driver circuit 22 is, for example, partially located in the domain 60 and partially located in the domain 70. The main control chip 5, the modulation circuit 33 and the voltage generation circuit 34 are located in a domain 60.

However, the present invention is not limited to the division of the circuit in the

domains

60 and 70, and manufacturers may make different adjustments according to actual needs, such as different circuit conditions.

The biological information sensing apparatus 1 may further include a ground line G disposed around the plurality of sensing units 11, and in some embodiments, the ground line G is in a grid shape, is located at the same layer as the sensing electrodes 111, and is disposed around the sensing electrodes 111, respectively. Alternatively, the ground line G may be provided with one turn around the plurality of sensing units 11, or the like.

In addition, when the biological information sensing device 1 is a domain that is referenced to a ground signal GND as a voltage reference, the first reference signal and/or the second reference signal is, for example, a voltage signal that is constant with respect to the ground signal GND. However, when the biological information sensing apparatus 1 uses the two

domains

60 and 70 as the voltage reference, the first reference signal and/or the second reference signal is, for example, a voltage signal that varies with respect to the ground signal GND and is a constant voltage signal with respect to the modulation signal MGND.

Furthermore, in addition to the above-mentioned technical solution by using a modulation ground, a power voltage signal of a modulated power end or a reference power source may also be used to uniformly modulate signals output by the driving circuit 20 to the plurality of sensing units 11.

Although embodiments have been described herein with respect to particular configurations and sequences of operations, it should be understood that alternative embodiments may add, omit, or alter elements, operations, or the like. Accordingly, the embodiments disclosed herein are meant to be examples and not limitations.

Claims

1. A biological information sensing apparatus comprising:

the sensing electrodes are arranged in a plurality of rows and columns;

for the same column of sense electrodes: when the driving circuit provides the excitation signal to a sensing electrode to perform the biological information sensing, a first reference signal is provided to part or all of the rest sensing electrodes, wherein the pressure difference between the first reference signal and the excitation signal is kept unchanged, so that the charging and discharging capacity of the parasitic capacitance between the sensing electrode applied with the first reference signal and the sensing electrode performing the biological information sensing is reduced.

2. The biological information sensing apparatus according to claim 1, characterized in that: the first reference signal is the same as the excitation signal.

3. The biological information sensing apparatus according to claim 1, characterized in that: for the same row of sense electrodes: when the driving circuit provides the excitation signal to one sensing electrode to perform the biological information sensing, a second reference signal is provided to the other sensing electrode, wherein the voltage difference between the second reference signal and the excitation signal is kept unchanged, so that the charging and discharging electric quantity of the parasitic capacitance between the sensing electrode applied with the second reference signal and the sensing electrode performing the biological information sensing is reduced.

4. The biological information sensing apparatus according to claim 3, characterized in that: the second reference signal is the same as the first reference signal.

5. The biological information sensing apparatus according to claim 3, characterized in that: for the same row of sense electrodes: the driving circuit simultaneously provides the excitation signal to a part of the sensing electrodes to perform the biological information sensing, and provides the second reference signal to a part or all of the rest sensing electrodes.

6. The biological information sensing apparatus according to claim 5, characterized in that: for the same row of sense electrodes: the driving circuit simultaneously drives a part of the sensing electrodes each time to perform biological information sensing by driving a plurality of times until driving of one row of the sensing electrodes is completed to perform biological information sensing.

7. The biological information sensing apparatus according to any one of claims 1 to 6, characterized in that: when the driving circuit provides the excitation signal to the sensing electrode, the driving circuit further receives a sensing signal output from the sensing electrode to perform self-capacitance type biological information sensing.

8. The biological information sensing apparatus according to any one of claims 1 to 6, characterized in that: the biological information sensing apparatus includes a plurality of sensing units, the sensing units including:

the sensing electrode;

a first control switch connected with the sensing electrode; and

a second control switch connected with the sensing electrode;

the drive circuit includes:

9. The biological information sensing apparatus according to claim 8, characterized in that: for the same column of sense electrodes:

10. The biological information sensing apparatus according to claim 9, characterized in that: the sensing driving circuit provides the excitation signal to the sensing electrode through the turned-on first control switch to perform biological information sensing, and receives a sensing signal output from the sensing electrode to acquire biological information.

11. The biological information sensing apparatus according to claim 9, characterized in that: when the scanning driving circuit drives the first control switches of one row of sensing units to be switched on and the second control switches to be switched off, the sensing driving circuit simultaneously provides the excitation signals to a part of sensing electrodes through the switched-on first control switches to execute biological information sensing, and the reference signal generating circuit provides the same second reference signals to the sensing electrodes of a part of or all the other sensing units through the switched-on first control switches.

12. The biological information sensing apparatus according to claim 11, characterized in that: the driving circuit further comprises a plurality of data selectors, the plurality of data selectors are connected with the reference signal generating circuit and the sensing driving circuit, each data selector is further connected with a sensing electrode of a sensing unit of the part through a first control switch, and the data selectors are used for selectively outputting the excitation signal or the second reference signal to the sensing electrode.

13. The biological information sensing apparatus according to claim 12, characterized in that: the driving circuit outputs the excitation signal to one sensing electrode to perform biological information sensing through each data selector at one time, and outputs the second reference signal to part or all of the other sensing electrodes in the same row through each data selector.

14. The biological information sensing apparatus according to claim 13, characterized in that: the biological information sensing device further comprises a control unit, wherein the control unit is respectively connected with the scanning driving circuit and the plurality of data selectors and is used for controlling the conduction time sequence of the first control switch and the second control switch in each row of sensing units driven by the scanning driving circuit and controlling the time sequence of outputting the excitation signal and the second reference signal to the sensing electrodes by controlling the plurality of data selectors.

15. The biological information sensing apparatus according to claim 14, characterized in that: the biological information sensing apparatus further includes:

16. The biological information sensing apparatus according to claim 15, characterized in that: the first data line is used for transmitting the excitation signal and the second reference signal, the second data line is used for transmitting the first reference signal, the scanning driving circuit provides scanning starting signals to the first control switch and the second control switch through the first scanning line and the second scanning line to control the first control switch and the second control switch to be switched on, and provides scanning stopping signals to the first control switch and the second control switch through the first scanning line and the second scanning line to control the first control switch and the second control switch to be switched off.

17. The biological information sensing apparatus according to claim 15, characterized in that: the biological information sensing apparatus further includes:

18. The biological information sensing apparatus according to claim 17, characterized in that: the biological information sensing apparatus includes a biological information sensor including an insulating substrate, the plurality of sensing units, the plurality of scanning line groups, the plurality of data line groups, and the first reference signal line being formed on the insulating substrate.

19. The biological information sensing apparatus according to claim 18, characterized in that: the first control switch and the second control switch in each sensing unit are both thin film transistor switches, and the insulating substrate is a glass substrate.

20. The biological information sensing apparatus according to claim 8, characterized in that: the sensing unit comprises a first control switch and a second control switch, or the sensing unit comprises two first control switches connected in parallel and two second control switches connected in parallel.

21. The biological information sensing apparatus according to claim 18, characterized in that: the insulating substrate includes a first surface for receiving a touch or proximity input of a target object and a second surface disposed opposite to the first surface, and the plurality of sensing units, the plurality of scanning line groups, the plurality of data line groups, and the first reference signal line are disposed on the second surface.

22. The biological information sensing apparatus according to claim 21, wherein: the sensing electrodes of the sensing units are closer to the second surface than the first control switch, the second control switch, the scanning line groups, and the data line groups.

23. The biological information sensing apparatus according to claim 21, wherein: the first control switch, the second control switch, the plurality of scanning line groups and the plurality of data line groups are positioned on one side of the sensing electrodes of the plurality of sensing units, which faces away from the insulating substrate.

24. The biological information sensing apparatus according to claim 21, wherein: the sensing electrodes of the sensing units cover the first control switch, the second control switch, the scanning line groups, and the data line groups.

25. The biological information sensing apparatus according to claim 18, characterized in that: the biological information sensor further includes the scan driving circuit, the plurality of data selectors, the second reference signal line, and the sensing signal line, which are formed on the second surface of the insulating substrate.

26. The biological information sensing apparatus according to claim 25, characterized in that: the scan driving circuit, the plurality of data selectors, the second reference signal line, and the sensing signal line are disposed around the plurality of sensing units.

27. The biological information sensing apparatus according to claim 25, characterized in that: the scanning driving circuit and the plurality of data selectors respectively comprise control switches, and the control switches are all thin film transistor switches.

28. The biological information sensing apparatus according to claim 14, characterized in that: each data selector comprises a plurality of switch units, each switch unit comprises a first selection switch and a second selection switch, the first selection switch comprises a control electrode, a first transmission electrode and a second transmission electrode, the second selection switch comprises a control electrode, a first transmission electrode and a second transmission electrode, the control electrode of the first selection switch and the control electrode of the second selection switch are respectively connected with the control unit, the first transmission electrode of the first selection switch is connected with the sensing driving circuit, the first transmission electrode of the second selection switch is connected with the reference signal generating circuit, and the second transmission electrode of the first selection switch and the second transmission electrode of the second selection switch are connected and connected to a first data line.

29. The biological information sensing apparatus according to claim 28, wherein: the control unit controls the first selection switch and the second selection switch in the same switch unit to be conducted in a time-sharing mode.

30. The biological information sensing apparatus according to claim 18, characterized in that: the biological information sensor further includes a passivation layer formed on the plurality of sensing units, the plurality of scanning line groups, the plurality of data line groups, and the first reference signal line.

31. The biological information sensing apparatus according to claim 30, characterized in that: the biological information sensing apparatus further includes a control chip including the control unit, the reference signal generating circuit, and the sensing driving circuit.

32. The biological information sensing apparatus according to claim 31, wherein: the biological information sensor and the control chip are respectively bare chips, and the control chip is bound on the insulating substrate; or the control chip is arranged on a flexible circuit board and is electrically connected with the biological information sensor through the flexible circuit board.

33. The biological information sensing apparatus according to claim 8, characterized in that: the driving circuit further comprises a modulation circuit, and the modulation circuit is used for uniformly modulating the signals output by the driving circuit to the plurality of sensing units so as to improve the signal-to-noise ratio of the sensing signals.

34. The biological information sensing apparatus according to claim 1, characterized in that: the biological information sensing device is a self-capacitance sensing device.

35. The biological information sensing apparatus according to claim 1, characterized in that: the biological information sensing device is a fingerprint sensing device.

36. The biological information sensing apparatus according to claim 1, characterized in that: the biological information sensing device further comprises an insulating substrate, a plurality of sensing units and a protective cover plate, wherein the sensing units are arranged between the insulating substrate and the protective cover plate, one side of the protective cover plate, which is opposite to the sensing units, is used for receiving touch or proximity input of a target object, and each sensing unit comprises a sensing electrode and a sensing circuit connected with the sensing electrode.

37. The biological information sensing apparatus according to claim 1, characterized in that: the biological information sensing device further comprises an insulating substrate, a plurality of sensing units and a coating layer, wherein the sensing units are arranged between the insulating substrate and the coating layer, one side of the coating layer, which is opposite to the sensing units, is used for receiving touch or proximity input of a target object, and each sensing unit comprises a sensing electrode and a sensing circuit connected with the sensing electrode.

38. A biological information sensing apparatus according to claim 36 or 37, wherein: the sensing circuit comprises a first control switch and a second control switch, wherein the first control switch and the second control switch are connected with the sensing electrode, the first control switch is used for controlling whether to transmit an excitation signal to the sensing electrode, the second control switch is used for controlling whether to transmit a first reference signal to the sensing electrode, and the first control switch and the second control switch are conducted in a time-sharing mode.

39. An electronic device comprising the biological information sensing apparatus according to any one of claims 1 to 38.