CN106462308A - Capacitive sensing device and electronic equipment - Google Patents

Abstract

The invention provides a capacitive sensing device and electronic equipment. The capacitive sensing device includes: a plurality of sensing units and a driving circuit. Each sensing unit includes: a sensing electrode; a first control switch connected to the sensing electrode; and a second control switch connected to the sensing electrode. The drive circuit is connected to the first control switch and the second control switch of the plurality of sensing units respectively, and is used to control the time-sharing conduction of the first control switch and the second control switch in the same sensing unit, and through conducting The first control switch that is turned on transmits an excitation signal to the sensing electrode to perform a sensing operation, and the second control switch that is turned on transmits a first reference signal to the sensing electrode.

Description

Capacitive sensing devices and electronics

technical field

The invention relates to the field of sensing technology, in particular to a capacitive sensing device and electronic equipment with the capacitive sensing device.

Background technique

With the development of society, more and more electronic devices (such as mobile phones, tablet computers, wearable devices, and various smart products such as smart homes) are generally provided with one or more sensing devices. The sensing device includes, for example, a touch sensing device that senses a user's touch operation, a biological information sensing device that senses biological information of a human body, and the like. Currently, touch sensing devices, biological information sensing devices, etc. mostly use capacitive sensing devices to perform sensing operations.

Taking a biological information sensing device as an example, generally, the biological information sensing device includes a plurality of sensing electrodes arranged in an array and a driving circuit connected to each sensing electrode. The driving circuit generally drives the sensing electrodes row by row to perform biological information sensing.

However, when the drive circuit drives part of the sensing electrodes to perform biological information sensing each time, the voltages on the remaining sensing electrodes may be inconsistent due to signal interference, etc. The parasitic effects of the electrodes are different and unknown, and the biological information sensing device requires relatively high sensing accuracy, which is not conducive to the accurate detection of biological information.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention needs to provide a capacitive sensing device and electronic equipment.

The invention provides a capacitive sensing device, comprising:

A plurality of sensing units, each sensing unit includes:

sensing electrodes;

a first control switch connected to the sensing electrode; and

a second control switch connected to the sensing electrode; and

The drive circuit is respectively connected to the first control switch and the second control switch of the plurality of sensing units, and is used to control the time-sharing conduction of the first control switch and the second control switch in the same sensing unit, and through the conduction The first control switch transmits an excitation signal to the sensing electrode to perform a sensing operation, and transmits a first reference signal to the sensing electrode through the turned-on second control switch.

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

Optionally, for the same column of sensing electrodes:

When the drive circuit drives the first control switch in one of the sensing units to be turned on and the second control switch to be turned off, the first control switch to drive part or all of the other sensing units to be turned off and the second control switch to be turned off. The switch is turned on.

Optionally, the drive circuit provides the excitation signal to the sensing electrode to perform biological information sensing through the first control switch that is turned on, and receives the sensing signal output from the sensing electrode to perform self-capacitance sensing. test operation.

Optionally, the driving circuit includes a scanning driving circuit, a sensing driving circuit, and a reference signal generating circuit, wherein the scanning driving circuit is used to drive the conduction between the first control switch and the second control switch and off, the sensing driving circuit is used to drive the sensing electrode to perform a sensing operation through the first control switch that is turned on, and the reference signal generation circuit is used to provide the second reference through the second control switch that is turned on signal to the sensing electrodes.

Optionally, when the scanning driving circuit drives the first control switch of a row of sensing units to turn on and the second control switch to turn off, the sensing driving circuit simultaneously provides the excitation signal through the turned-on first control switch The sensing operation is performed on some of the sensing electrodes, and the reference signal generation circuit further provides the same second reference signal to the sensing electrodes of some or all of the remaining sensing units through the turned-on first control switch.

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

Optionally, for the same row of sensing electrodes: the driving circuit simultaneously drives some of the sensing electrodes to perform a sensing operation each time, and performs multiple driving until a row of sensing electrodes is driven to perform a sensing operation.

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, and each data selector is further connected through a first control switch For the sensing electrodes of some sensing units, the data selector is used to select and output the excitation signal or the second reference signal to the sensing electrodes.

Optionally, the driving circuit simultaneously outputs the excitation signal to a sensing electrode through each data selector to perform a sensing operation, and outputs the second reference signal to the rest of the same row through each data selector. Some or all of the sensing electrodes.

Optionally, the capacitive sensing device further includes a control unit, the control unit is respectively connected to the scan drive circuit and the plurality of data selectors, and is used to control the scan drive circuit to drive each row of sensing units The turn-on timing of the first control switch and the second control switch, and the timing of outputting the excitation signal and the second reference signal to the sensing electrodes by controlling the plurality of data selectors.

Optionally, the capacitive sensing device further includes:

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

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

Each scanning line group is connected to a row of sensing units, and each data line group is connected to a row of sensing units;

The first control switch includes a control electrode, a first transfer electrode, and a second transfer electrode; the second control switch includes a control electrode, a first transfer electrode, and a second transfer electrode; the first scan line is connected to the The scan drive circuit and the control electrode of the first control switch; the second scan line is connected to the scan drive circuit and the control electrode of the second control switch; the first data line is connected to the data selector and the first transmission electrode of the first control switch; the second data line is connected to the reference signal generating circuit and the first transmission electrode of the second control switch; the second transmission electrode of the first control switch is connected to the sensor The measuring electrode; the second transmission electrode of the second control switch is connected to the sensing electrode.

Optionally, the first data line is used to transmit the excitation signal and the second reference signal, the second data line is used to transmit the first reference signal, and the scan driving circuit passes the first One scan line and the second scan line provide scan start signals to the first control switch and the second control switch to control the conduction of the first control switch and the second control switch, and the first scan line and the second scan line provide The scanning cut-off signal is sent to the first control switch and the second control switch to control the first control switch and the second control switch to cut off.

Optionally, the capacitive sensing device further includes:

a first reference signal line, connected to the reference signal generation circuit and a 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

The sensing signal line is connected to 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 capacitive sensing device includes a capacitive sensor, and the capacitive sensor includes 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, the plurality of sensing units, the plurality of scan line groups, the plurality of data line groups, and the first reference signal line are formed on the insulating substrate superior.

Optionally, both the first control switch and the second control switch in each sensing unit are 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 and a second surface opposite to the first surface, the first surface is used to receive a touch or proximity input of a target object, the plurality of sensing units, the A plurality of scan line groups, the plurality of data line groups, and the first reference signal lines are disposed on the second surface.

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

Optionally, the first control switch, the second control switch, the plurality of scan line groups, and the plurality of data line groups are located opposite to the sensing electrodes of the plurality of sensing units one side of 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 scan line groups, and the plurality of data line groups.

Optionally, the capacitive sensor further includes the scanning driving circuit, the plurality of data selectors, the second reference signal line, and the sensing signal line, the scanning driving circuit, the multiple A data selector, the second reference signal line, and the sensing signal line are formed on the second surface of the insulating substrate.

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

Optionally, both the scan driving circuit and the plurality of data selectors include control switches, and the control switches are 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, and 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 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 generation circuit, and the second transmission electrode of the first selection switch It is connected to the second transmission electrode of the second selection switch and connected to the 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 time division.

Optionally, the capacitive sensor further includes a passivation layer formed on the plurality of sensing units, the plurality of scan line groups, the plurality of data line groups, and the first reference signal on-line.

Optionally, the capacitive sensing device further includes a control chip, and the control chip includes the control unit, the reference signal generating circuit, and the sensing driving circuit.

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

Optionally, the driving circuit further includes a modulating circuit, and the modulating 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.

Optionally, the capacitive sensing device is a fingerprint sensing device.

Since the sensing unit of the capacitive sensing device of the present invention further includes a first control switch and a second control switch, the drive circuit can be turned on in time by controlling the first control switch and the second control switch, To drive the sensing electrode to perform the sensing operation through the turned-on first control switch, and further provide the first reference signal to the sensing electrode through the turned-on second control switch, so that the first reference signal is applied The parasitic influence of the sensing electrodes on the sensing electrodes performing sensing is known, and accordingly, the drive circuit can eliminate the known parasitic influences during the process of acquiring biological information, thereby improving the accuracy of sensing operations.

Further, when the capacitive sensing device drives some of the sensing electrodes in each row to perform a sensing operation, it provides a second reference signal to part or all of the remaining sensing electrodes in the same row for sensing. electrodes, so that the parasitic influence of the sensing electrodes applied with the second reference signal on the sensing electrodes performing sensing can be known, and correspondingly, the drive circuit can eliminate known parasitic effects in the process of acquiring biological information influence, thereby improving the accuracy of the sensing operation.

The present invention further provides an electronic device, which includes the capacitive sensing device described in any one of the above.

Since the electronic equipment includes the capacitive sensing device, the user experience of the electronic equipment is high.

Description of drawings

FIG. 1 is a schematic diagram of the circuit structure of an embodiment of the biological information sensing device of the present invention.

FIG. 2 is a top view of a partial structure of the biological information sensing device shown in FIG. 1 .

FIG. 3 is a schematic diagram of the circuit structure of an embodiment of the data selection circuit of the biological information sensing device shown in FIG. 1 .

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

FIG. 5 is a partial cross-sectional structural schematic diagram of the biological information sensing device shown in FIG. 4 .

FIG. 6 is a diagram of the use state of the biological information sensing device shown in FIG. 4 .

FIG. 7 is a flow chart of a manufacturing method of an embodiment of the biological information sensor shown in FIG. 3 .

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

FIG. 9 is a partial structural schematic diagram of another embodiment of the biological information sensing device of the present invention.

Fig. 10 is a top view of another embodiment of the sensing unit of the biological information sensing device of the present invention.

Fig. 11 is a partial structural schematic diagram of another embodiment of the biological information sensing device of the present invention.

FIG. 12 is a schematic structural diagram of an embodiment of the electronic device of the present invention.

FIG. 13 is a circuit structure block diagram of an embodiment of the electronic device shown in FIG. 12 .

detailed description

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Example embodiments may, however, be embodied in many 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. For convenience or clarity, the thickness and size of each layer shown in the drawings and the number of related elements may be exaggerated, omitted, or schematically shown. Also, the size of elements does not entirely reflect an actual size, and the number of related elements does not entirely reflect an actual number. Due to reasons such as different sizes of the drawings, the numbers of the same or similar or related elements shown in different drawings may not be consistent. The same reference numbers in the figures indicate the same or similar structures. However, it should be noted that in order to make the labels regular and logical, in some different embodiments, the same or similar elements or structures use different reference signs, according to the technical relevance and related text descriptions , those skilled in the art can determine directly or indirectly.

Furthermore, the described features and structures may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or with other structures, components, and the like. 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 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 presently known or not), including other terms that are inferred or could be inferred by those skilled in the art after reading this application. expand.

In the description of the present invention, it should be understood that: "plurality" includes two or more than two, and "plurality" includes two or more, unless otherwise specifically defined in the present invention. "At least two columns" includes various suitable situations such as two columns, three columns, four columns, five columns, etc. which gradually increase. In addition, words such as "first" and "second" appearing in the names of components and signals do not limit the order in which components or signals appear, but are for the convenience of naming components and signals and clearly distinguishing components and signals. Make the description more concise.

It should be further noted that: the capacitive sensing device provided by the present invention is suitable for biological information sensing devices, especially fingerprint sensing devices. However, the present invention is not limited thereto, and the capacitive sensing device can also be applied to other suitable types of sensing devices, such as touch sensing devices and the like. The biological information sensing device is used for sensing predetermined biological information of a target object. For example, the target object is a user's finger, it can also be other parts of the user's body, such as the palm, toes, ears, etc., or even other suitable types of objects, and is not limited to the human body. The predetermined biological information is, for example, fingerprints, palm prints, ear prints and the like.

In the following, various embodiments of the present invention will be described by taking the capacitive sensing device as a biological information sensing device as an example.

Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a schematic diagram of the circuit structure of an embodiment of the biological information sensing device of the present invention. FIG. 2 is a top view of a partial structure of the biological information sensing device shown in FIG. 1 . The biological information sensing device 1 includes a plurality of sensing electrodes 111 and a driving circuit 20 . The driving circuit 20 is connected to the plurality of sensing electrodes 111 for driving the plurality of sensing electrodes 111 to perform biological information sensing.

Generally, capacitive sensing devices include mutual capacitive sensing devices and self-capacitive sensing devices.

Depending on the cooperation relationship between the driving circuit 20 and the sensing electrodes 111 , the biological information sensing device 1 may be a self-capacitive biological information sensing device or a mutual capacitance biological information sensing device.

In a mutual-capacitance-based biological information sensing device, the mutual-capacitance biological information sensing device may include a plurality of driving electrodes and a plurality of sensing electrodes. Mutual capacitance is formed between each driving electrode and a sensing electrode. During sensing, the driving circuit provides excitation signals to the driving electrodes and receives sensing signals output from the sensing electrodes. When the target object approaches or touches the biological information sensing device, the amount of charge formed in the mutual capacitance between the driving electrode and the sensing electrode will change accordingly, so that the sensing electrode will output a corresponding sensing signal to the Drive the circuit, and then obtain relevant biological information.

In the self-capacitance-based bio-information sensing device, the self-capacitance-based bio-information sensing device includes a plurality of sensing electrodes. Each sense electrode may form a capacitance to ground. During sensing, the drive circuit provides excitation signals to the sensing electrodes and receives sensing signals output from the sensing electrodes. When the target object approaches or touches the biological information sensing device, a capacitance is formed between the target object and the sensing electrode, causing a change in the amount of charge on the sensing electrode, so that the sensing electrode outputs a corresponding sensing signal to the driver circuit, and then obtain relevant biological information.

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

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

For the sensing electrodes 111 in the same column: when the driving circuit 20 provides an excitation signal to a sensing electrode 111 to perform biological information sensing, provide a first reference signal to some or all of the other sensing electrodes 111 for sensing electrode 111. Preferably, the driving circuit 20 provides the first reference signal to all other sensing electrodes 111 .

Since the drive circuit 20 provides the first reference signal to the remaining part or all of the sensing electrodes 111 when providing the excitation signal to a sensing electrode 111 in each column of sensing electrodes 111, thus, the applied The parasitic influence of the sensing electrode 111 of the first reference signal on the sensing electrode 111 performing biological information sensing is known, so that the drive circuit 20 can counteract the known parasitic influence in the subsequent calculation of biological information , thereby improving the sensing accuracy of 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 remains unchanged, for example, the first reference signal is the same as the excitation signal, thereby reducing the difference between the rest of the sensing electrodes 111 and the biological information being performed. Sensing the charge and discharge of the parasitic capacitance between the sensing electrodes 111 further improves the sensing accuracy of biological information.

In this embodiment, the driving circuit 20 drives the sensing electrodes 111 row by row to perform biological information sensing. However, alternatively, in other implementation manners, the driving circuit 20 may simultaneously drive multiple rows of sensing electrodes 111 to perform biological information sensing.

Further, in this embodiment, for the sensing electrodes 111 in the same row: the drive circuit 20 simultaneously provides the excitation signal to some of the sensing electrodes 111 to perform biological information sensing, and provides a second reference signal to the rest Some or all of the sensing electrodes 111 are sensed. Preferably, the second reference signal is provided to all other sensing electrodes 111 .

For the sensing electrodes 111 in the same row: the driving circuit 20 provides the excitation signal to some of the sensing electrodes 111 multiple times simultaneously to perform biological information sensing, thereby driving a row of sensing electrodes 111 to perform biological information sensing.

When the plurality of sensing electrodes 111 are formed on a chip, a time-sharing driving method for a row of sensing electrodes 111 can be adopted, thereby reducing the number of pins on the chip, which will be described later.

However, alternatively, in other implementation manners, the driving circuit 20 may also simultaneously drive a row of sensing electrodes 111 to perform biological information sensing. For example, the plurality of sensing electrodes 111 are formed in a display screen. When the plurality of sensing electrodes 111 are arranged on the chip, the driving circuit can simultaneously drive a row of sensing electrodes 111 to perform biological information sensing.

In addition, since the drive 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 111 111, thus, the parasitic influence of the sensing electrode 111 applied with the second reference signal on the sensing electrode 111 performing biological information sensing is known, thus, the driving circuit 20 subsequently calculates the biological information Known parasitic effects can be counteracted at this time, thereby improving the sensing accuracy of 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 remains unchanged, for example, the second reference signal is the same as the excitation signal, thereby reducing the difference between the rest of the sensing electrodes 111 and the biological information being performed. Sensing the charge and discharge of the parasitic capacitance between the sensing electrodes 111 further improves the sensing accuracy of biological information.

In some specific implementations, the biological information sensing device 1 includes a plurality of sensing units 11 . Each sensing unit 11 includes a sensing electrode 111 , a first control switch 113 , and a second control switch 115 . Both the first control switch 113 and the second control switch 115 are connected to the sensing electrodes 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 in the plurality of sensing units 11 respectively, and is used to drive the first control switch 113 and the second control switch 115 in each sensing unit 11. The control switch 115 is turned on in time division. 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 to provide the excitation signal to the sensing electrode 111 through the turned-on first control switch 113 to execute biological control. 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 used to provide the first reference signal to the sensing electrode through the turned-on second control switch 115. electrode 111.

For the sensing electrodes 111 in the same column: when the scanning drive circuit 21 drives the first control switch 113 in one sensing unit 11 to be turned on and the second control switch 115 to be turned off, it will drive some or all of the other sensing units 11 The first control switches 113 of all sensing units 11 are turned off, and the second control switches 115 are turned on, and the reference signal generation circuit 23 provides the first reference signal to the sensing electrodes 111 through the turned-on second control switches 115 .

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

Further, when the scanning driving circuit 21 drives the first control switch 113 of a row of sensing units 11 to turn on and the second control switch 115 to turn off, the sensing driving circuit 22 simultaneously passes through the turned-on first control switch 113 Provide the excitation signal to some of the sensing electrodes 111 to perform biological information sensing, and the reference signal generation circuit 23 provides the second reference signal to some or all of the remaining sensing units 11 through the first control switch 113 that is turned on. Sensing electrodes 111 of all sensing units 11 .

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

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

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

The drive circuit 20 simultaneously outputs the excitation signal to a sensing electrode 111 through each data selector 241 to perform biological information sensing, and outputs the second reference signal to the same row through each data selector 241 respectively. Some or all of the remaining sensing electrodes 111 are sensing electrodes 111 .

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 multiple times successively, so as to drive a row of the sensing electrodes 111 to perform biological information sensing.

Alternatively, in other implementation manners, the data selection circuit 24 may also have other suitable circuit structures, and is not limited to the plurality of data selectors 241 described here. In addition, when the driving circuit 20 provides the excitation signal to the sensing electrodes 111 of each row at the same time, the data selection circuit 24 can also be omitted.

The driving circuit 20 may further include a control unit 30 . The control unit 30 is respectively connected to the scan drive circuit 21 and the plurality of data selectors 241, and is used to control the scan drive circuit 21 to drive the first control switch 113 and the second control switch 113 in each row of sensing units 11. The turn-on timing of the switch 115 and the timing of outputting the excitation signal and the second reference signal to the sensing electrode 111 are controlled 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 some rows or The second control switches 115 of the sensing units 11 in all rows are 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 time division.

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 time division.

In some implementations, the biological information sensing device 1 further includes a plurality of scanning line groups B and a plurality of data line groups D, for example. Each scan 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 transmission electrode S11, and a second transmission electrode S12. The second control switch 115 includes a control electrode G2, a first transmission electrode S21, and a second transmission electrode S22. The first scanning line B1 is connected to the scanning driving circuit 21 and the control electrode G1 of the first control switch 113 . The second scanning line B2 is connected to the scanning driving circuit 21 and the control electrode G2 of the second control switch 115 . The first data line D1 is connected to the data selector 241 and the first transmission electrode S11 of the first control switch 113 . The second data line D2 is connected to the reference signal generating circuit 23 and the first transmission 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 to transmit the excitation signal and the second reference signal, the second data line D2 is used to transmit the first reference signal, and the scan driving circuit 21 passes the first The scan line B1 and the second scan line B2 provide scan start signals to the first control switch 113 and the second control switch 115 to control the conduction of the first control switch 113 and the second control switch 115, through which the first scan line B1 , The second scan line B2 provides a scan cut-off signal to the first control switch 113 and the second control switch 115 to control the first control switch 113 and the second control switch 115 to be turned off.

Both the first scanning lines B1 and the second scanning lines B2 extend along the row direction and are arranged along the column direction. Both the first data lines D1 and the second data lines D2 extend along the column direction and are arranged along the row direction.

In some implementations, the biological information sensing device 1 further includes a first reference signal line R1, a second reference signal line R2, and a sensing signal line L, for example. 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 for transmitting the second reference signal. The sensing signal line L is connected to 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 electrode 111. Test drive circuit 22.

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

Please refer to FIG. 3 . FIG. 3 is a schematic circuit diagram of an embodiment of the data selector 241 shown in FIG. 1 of the present invention. The data selector 241 includes eight switch units 243, and each switch 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 transmission electrode S41, and a second transmission electrode S42. The control unit 30 is respectively connected to the control electrode G3 and the control electrode G4 in each switch unit 243 . The first transmission electrode S31 is connected to the sensing driving circuit 22 . The first transmission electrode S41 is connected to the reference signal generation circuit 23 . The second transmission electrode S32 in each switch unit 243 is connected to the second transmission electrode S42 and connected to the first transmission electrode S11 of the first control switch 113 .

For the same switch unit 243: the control unit 30 controls the first selection switch S1 and the second selection switch S2 to be turned on in time division, that is, when the first selection switch S1 is turned on, the second selection switch S2 is turned off; 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 in one switch unit 243 to be turned on and the second selection switch S2 to be turned off, it controls the first selection switch S1 in the remaining switch units 243 to be turned off, The second selection switch S2 is turned on. Through the turned-on first selection switch S1, the sensing drive circuit 22 provides the excitation signal to the sensing electrode 111 of the sensing unit 11 with the first control switch 113 turned on; through the turned-on second selection switch S2 The reference signal generating circuit 23 provides the second reference signal to the sensing electrode 111 of the sensing unit 11 where the second control switch 115 is turned on.

In this 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 sensing electrodes 111 in the same row is 128.

It should be noted that, in FIG. 1, limited by the size of the drawings, FIG. 1 only shows that each data selector 241 is connected to the two columns of sensing units 11 respectively. If it is connected with the data selector 241 shown in FIG. Corresponding to the structure of FIG. 1 , the structure in which each data selector 241 is also connected to the other six columns of sensing units 11 is actually omitted in FIG. 1 . In addition, the structure of FIG. 4 described later corresponds to the structure shown in FIG. 1 , and the structure in which each data selector 241 is also connected to the other six columns of sensing units 11 is also omitted, and will be described here together.

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

Taking the biometric information sensing device 1 as an example of a fingerprint sensing device, when the user's finger approaches or touches the sensing electrodes 111 of the plurality of sensing units 11, due to the distance between the ridges, valleys and the sensing electrodes 111 Therefore, the capacitances formed by the ridges, valleys and the sensing electrodes 111 are different, so that the influence on the amount of charge on the sensing electrodes 111 is different, so that the driving circuit 20 can output the sensing signal according to the sensing electrodes 111. Corresponding fingerprint information can be obtained.

The working principle of an embodiment of the biological information sensing device 1 is as follows.

The control unit 30 controls the first selection switch S1 in a switch unit 243 in each data selector 241 to turn on, the second selection switch S2 to turn off, and controls the first selection switch S2 in the remaining switch units 243 in each data selector 241. The selection switch S1 is turned off, and the second selection switch S2 is turned on. Correspondingly, the sensing drive circuit 22 provides the excitation signal to the first data line D1 through the first selection switch S1 turned on in each data selector 241 The reference signal generation circuit 23 provides the second reference signal to the first data line D1 through the second selection switch S2 turned on in each data selector 241 . Through multiple times of control by the control unit 30 , the first selection switch S1 in each switch unit 243 in each data selector 241 is time-divisionally turned on.

The control unit 30 controls the scanning drive circuit 21 to drive the first control switch 113 to be turned on and the second control switch 115 to be turned off row by row, and control the first control switch 113 of each row to be turned on and the second control switch 115 to be turned off. At the same time, the first control switch 113 that controls the remaining rows is turned off, and the second control switch 115 is turned on. Correspondingly, the excitation signal on the first data line D1 is output to the sensing electrode through the turned-on first control switch 113 111, and receive the sensing signal output from the sensing electrode 111 to perform biological information sensing, the second reference signal on the first data line D1 is output to the sensing electrode 111 through the first control switch 113 that is turned on , in addition, the reference signal generation circuit 23 provides the first reference signal to the sensing electrode 111 through the turned-on second control switch 115 .

By providing the first reference signal and the second reference signal to the remaining corresponding sensing electrodes 111 when the sensing electrodes 111 are driven each time to perform biological information sensing, the accuracy of the biological information of the biological information sensing device 1 is improved. Sensing accuracy.

Please refer to FIG. 1 , FIG. 4 to FIG. 6 together. FIG. 4 is a schematic structural diagram of another embodiment of the biological information sensing device of the present invention. FIG. 5 is a partial cross-sectional structural schematic diagram of the biological information sensing device shown in FIG. 4 . FIG. 6 is a diagram of the use state of the biological information sensing device shown in FIG. 4 . The biological information sensing device 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 scan 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 2a.

In this embodiment, the first control switch 113 and the second control switch 115 in each sensing unit 11 are, for example, thin film transistor (Thin Film Transistor, TFT) switches, and the insulating substrate 2a is, for example, a glass substrate. Therefore, the biological information sensor 2 is fabricated by adopting a process of forming a TFT switch on a glass substrate, thereby reducing the production cost of the biological information sensor 2 and including the biological information sensor 2 . When the first control switch 113 and the second control switch 115 are thin film transistor switches, the control electrodes G1 and G2 are gate electrodes, the first transfer electrodes S11 and S21 are source electrodes, and the second transfer electrodes S12 and S22 are drains.

However, the present invention does not limit the insulating substrate 2a to be a glass substrate, and may also be other suitable types of insulating substrates, and also does not limit the first control switch 113 and the second control switch 115 to be thin film transistors. switch, or any other suitable type of switch.

The thin film transistor switch is, 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 and other suitable types of thin film transistor switches. 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 opposite to the first surface A1, the first surface A1 is used to receive 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 A2.

The sensing electrodes 111 of the plurality of sensing units 11 are compared to the first control switch 113, the second control switch 113, the plurality of scanning line groups B, and the plurality of data line groups Group D is closer to the second surface A2.

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 on the sensing electrodes 111 of the plurality of sensing units 11 The side facing away from the insulating substrate 2a.

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

The biological information sensor 1 further includes a passivation layer 16, and the passivation layer 16 is arranged on 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 passivation layer 16 is used to planarize the surface of the biological information sensor 2 and protect the plurality of sensing units 11 and other components.

Please refer to FIG. 5 and FIG. 7 together. FIG. 7 is a flowchart of a manufacturing method of an embodiment of the biological information sensor 2 . The fabrication method of the biological information sensor 2 is as follows.

F1: providing an insulating substrate 2a;

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

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

The sensing electrodes 111 are made of metal materials, for example. However, alternatively, the sensing electrode 111 can also be made of other suitable conductive materials, for example, the sensing electrode 111 can also be made of a transparent conductive material, such as indium oxide Tin, Indium Zinc Oxide, etc. In addition, the sensing electrodes may also be made of alloy materials such as molybdenum, lithium and molybdenum.

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

The first insulating layer 12 is made of, for example, silicon oxide, silicon nitride and other materials.

F4: Form a first control switch 113 and a second control switch 115 on the first insulating layer 12, and form a through hole H penetrating to the sensing electrode 111 on the first insulating layer 12, through which Hole H, 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 electrodes 111 and connected to the sensing electrodes 111 through the through holes H respectively.

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

The biological information sensor 2 is finished. It should be noted that, in the above manufacturing method, the step of forming the plurality of scan line groups B, the plurality of data line groups D, and the first reference signal line R1 is omitted.

Since the manufacturing process of the biological information sensor 2 formed according to the above manufacturing method is simple, there is no need to additionally provide a protective cover plate or form a coating layer (Coating layer), thereby saving manufacturing cost.

However, alternatively, in other embodiments, the manufacturing method of the biological information sensor 2 may also be: forming the first control switch 113 and the second control switch 115 of each sensing unit 11 on the insulating substrate 2a , forming a first insulating layer 12 on the first control switch 113 and the second control switch 115, and forming a second transmission electrode penetrating through the first control switch 113 and the second control switch 115 on the first insulating layer 12 The through hole H of the second transmission electrode S22 is formed on the first insulating layer 12 to connect the first control switch 113 of each sensing unit 11 and the sensing electrode 111 on the second control switch 115 , Next, a protective cover plate or a coating layer (Coating layer) is formed on the sensing electrode 111 . This is also possible. It should be noted 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.

Continue to refer to FIG. 5 , and please refer to FIG. 8 together. FIG. 8 is a flowchart of a method for manufacturing the first control switch 113 and the second control switch 115 . Taking amorphous silicon thin film transistors as an example for the first control switch 113 and the second control switch 115 , the manufacturing method for forming the first control switch 113 and the second control switch 115 in the process of manufacturing the biological information sensor 2 is described as follows.

F41: forming the control electrode G1 of the first control switch 113 and the 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 and other materials.

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

The active layers 14 and 15 are amorphous silicon layers.

F44: forming a through hole 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 can be combined and implemented in one step, however, they can also be formed in two different steps.

F45: forming the first transmission electrode S11 and the second transmission electrode S12 of the first control switch 113 on the second insulating layer 13, forming the first transmission electrode S21 and the second transmission electrode S22 of the second control switch 115, and The second transmission electrode S12 and the second transmission electrode S22 are filled with the through hole H to be respectively connected to the sensing electrodes 111 .

The first transfer electrode S11 and the second transfer electrode S12 are located on both sides of the active layer 14, and the first transfer electrode S21 and the second transfer electrode S22 are located on both sides of the active layer 15, thereby forming The first control switch 113 and the second control switch 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 respectively connected to the sensing electrode 111 through a through hole H. However, in other implementation manners, 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 can be connected to the second transmission electrode S22 of the second control switch 115 through the same through hole H. The sensing electrodes 111 are connected.

In step F5: forming the said Passivation layer 16.

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

It should be further explained that, the connecting wires 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 Finally, for example, it is connected with the surrounding wiring (not marked) formed on the second surface A2 of the insulating substrate 2a through a via hole, so as to communicate with the corresponding circuit in the aforementioned drive circuit 20 or the control chip 3 described later. transmission.

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 2a.

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 units 11 .

The first selection switch S1 and the second selection switch S2 of the data selector 241 are also thin film transistor switches, for example. The scan driving circuit 21 generally includes a plurality of control switches (not shown in the figure), and the plurality of control switches are thin film transistor switches, for example. Correspondingly, 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 degree of the biological information sensor 2 is improved, and the production cost is reduced.

In some implementations, the biological information sensing device 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, a part of the aforementioned driving circuit 20 is formed in the control chip 3, and a part is formed on the biological information sensor 2. Such arrangement can improve the integration degree of the biological information sensing device 1 on the one hand and reduce the The volume of the sensing device 1 can be reduced, and the manufacturing cost of the biological information sensing device 1 can also be reduced.

Optionally, the biological information sensor 2 and the control chip 3 are, for example, dies, respectively, and the control chip 3 is disposed on the insulating substrate 2a by, for example, a flip-chip process (Flip-Chip). When the insulating substrate 2a is, for example, a glass substrate, the control chip 3 is bonded (Bonding) on the glass substrate by, for example, Chip On Glass (COG). When the insulating substrate 2 a is, for example, a thin film substrate, the control chip 3 is bound on the thin film substrate by, for example, a chip on film (Chip On Film, COF). However, the control chip 3 can also be formed on the insulating substrate 2a by other suitable processes, and is not limited to the flip-chip process described here.

After the control chip 3 is arranged 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 is formed by an injection molding (Molding) process (Fig. not shown) on the biological information sensor 2 and the control chip 3 to form a chip (Chip). The package body is made of, for example, epoxy resin material, but is not limited to the epoxy resin material, and may also be other suitable materials.

After the biological information sensing device 1 is formed, the first surface A1 of the insulating substrate 2a is used to receive the approach or touch input of the target object, or in other words, when the user uses the biological information sensing device 1 to sense biological information, the first surface A1 is closer to the target object than the second surface A2.

In other implementation manners, the scan driving circuit 21, the data selection circuit 24, the second reference signal line R2, and the sensing signal line L may not be disposed on the insulating substrate 2a. For example, the scan driving circuit 21 and the data selection circuit 24 may also be disposed in the control chip 3 , or disposed in another chip, or exist as circuits outside the chip.

Please refer to FIG. 9 . FIG. 9 is a schematic structural diagram of another embodiment of the biological information sensing device of the present invention. The biological information sensing device 1 further includes a connecting piece 4 for connecting the control chip 3 and the biological information sensor 2 . The connector 4 is, for example, a flexible printed circuit board (Flexible Printed Circuit Board, FPCB). The control chip 3 is, for example, disposed on the flexible circuit board 4 and connected to the biological information sensor 2 through the flexible circuit board 4 . Signal transmission is performed between the biological information sensor 2 and the control chip 3 through the flexible circuit board 4 .

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

Alternatively, in other implementation manners, for example, the biological information sensor 2 may also be formed in or on the display screen instead of being integrated into a bare chip or a chip. When the biological information sensor 2 is formed in or on the display screen, the control chip 3 can simultaneously drive a row of sensing electrodes 111 to perform biological information sensing.

Please refer to FIG. 10 , which is a schematic structural diagram of another embodiment of the sensing unit of the present invention. The sensing unit 11 includes two first control switches 113 connected in parallel and two second control switches 115 connected in parallel.

Please refer to FIG. 11 . FIG. 11 is a schematic structural diagram of another embodiment of the biological information sensing device 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. Correspondingly, it is also feasible for the driving circuit 20 to output corresponding signals to the sensing electrodes 111 respectively.

Please refer to FIG. 12 . FIG. 12 is a schematic structural diagram of an embodiment of the electronic device of the present invention. The electronic device 9 includes the biological information sensing device 1 described in any one of the above-mentioned embodiments. The electronic device 9 is, for example, a portable electronic product, a household electronic product, or a vehicle electronic product. However, the electronic equipment is not limited to the electronic products listed here, and may also 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 other suitable mobile terminals. The household electronic products are, for example, smart door locks, televisions, refrigerators, desktop computers and other suitable household electronic products. The vehicle-mounted electronic products are, for example, suitable vehicle-mounted electronic products such as a vehicle-mounted display, a driving 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 arranged at any suitable position such as the front, side, and back of the mobile phone. In addition, the biological information sensing device 1 can be set as The shell of the mobile phone is exposed, and it can also be arranged inside the mobile phone. In this embodiment, the biological information sensing device 1 is arranged on the front of the mobile phone.

According to the biological information sensed by the biological information sensing device 1 , the electronic device 9 performs, for example, user identity authentication, online payment, quick launch of an application program (APP), and the like.

Since the electronic device 9 includes the biological information sensing device 1 , the sensing accuracy of the biological information sensing device 1 is relatively high, so the user experience of the electronic device 9 is better.

Please refer 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 includes a main control chip 5 . The main control chip 5 is connected with the biological information sensing device 1 for data communication with the biological information sensing device 1 . The main control chip 5 is, for example, a single chip or a chipset. When the main control chip 5 is a chipset, the chipset includes an application processor (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 also be replaced by a central processing unit (Central Processing Unit, CPU).

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

In the aforementioned embodiments, the biological information sensing device 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 for each circuit in the biological information sensing device 1 .

In order to improve the signal-to-noise ratio of the sensing signal of the biological information sensing device 1, the present invention further proposes to use a modulation technical scheme to achieve the technical purpose of improving the signal-to-noise ratio. The modulation technical scheme is applicable to the biological Information Sensing Device 1.

For example, the signal output to the sensing unit 11 is uniformly modulated through a technical scheme of modulating the ground.

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 equipment ground. The voltage generation circuit 34 is used for providing a voltage driving signal to the modulation circuit 33 . The modulation circuit 33 correspondingly generates a modulation signal MGND to the second ground terminal 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 the signals output from the driving circuit 20 to the sensing unit 11, for example, the first reference signal, the second reference signal, the excitation signal, the scanning an on signal, and the scan off signal. Wherein, the ground (for example, the second ground terminal 32 ) loaded with the modulation signal MGND is the 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 in which the first voltage signal and the second voltage signal change alternately. Wherein, 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 increase 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 , it needs to inversely modulate the sensing signal to obtain corresponding biological information.

In this embodiment, the biological information sensing device 1 uses two domains as voltage references. Two domains are shown as domain 60 referenced to ground signal GND and domain 70 referenced to modulation signal MGND, respectively. The ground terminals of the circuits in the domain 60 based on the ground signal GND are directly connected to the device ground, and the ground terminals of the circuits in the domain 70 based on the modulation signal MGND are directly connected to the modulation ground. Further, for a circuit whose ground is the modulation ground, its reference ground potential is the modulation signal MGND loaded by the modulation ground; for a circuit whose ground is the equipment ground, its reference ground potential is the ground signal GND loaded by the equipment ground.

In this 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 arranged in the domain 70 , for example. For example, a part of the sensing driving circuit 22 is located in the domain 60 and a part is located in the domain 70 . The main control chip 5 , the modulation circuit 33 , and the voltage generation circuit 34 are located in the domain 60 .

However, alternatively, the present invention is not limited to the division of the above-mentioned circuits in domains 60 and 70 , and manufacturers can make different adjustments according to actual needs, such as different circuit conditions.

The biological information sensing device 1 may further include a ground wire G, the ground wire G is arranged around the plurality of sensing units 11, in some embodiments, the ground wire G is grid-like, and the The sensing electrodes 111 are located on the same layer and are arranged around the sensing electrodes 111 respectively. Alternatively, the grounding wire G may also be arranged in a circle around the plurality of sensing units 11 or the like.

In addition, when the biological information sensing device 1 uses a domain as a voltage reference, and the domain is a domain based on the ground signal GND, the first reference signal and/or the second reference signal, for example is a constant voltage signal relative to the ground signal GND. However, when the biological information sensing device 1 uses the two domains 60 and 70 as voltage references, the first reference signal and/or the second reference signal, for example, vary relative to the ground signal GND The voltage signal of is a constant voltage signal relative to the modulation signal MGND.

Furthermore, in addition to the above-mentioned technical solution of using modulation ground, it is also possible to uniformly modulate the signals output from the drive circuit 20 to the plurality of sensing units 11 by modulating the power supply voltage signal of the power supply terminal or the reference power supply.

It should be further explained that by setting the first control switch 113 and the second control switch 115, the number of connections between the sensing unit 11 and peripheral circuits (for example, the sensing driving circuit 22, the reference signal generating circuit 23) can be reduced. foot.

Although embodiments have been described herein with respect to specific configurations and sequences of operations, it should be understood that alternative embodiments may add, omit, or change elements, operations, and the like. Therefore, the embodiments disclosed here are meant to be examples rather than limitations.

Claims (32)

1. a kind of capacitance-type sensing device, including：

Multiple sensing units, each sensing unit includes：

Sensing electrode；

First controlling switch, is connected with described sensing electrode；With

Second controlling switch, is connected with described sensing electrode；With

Drive circuit, is connected with the first controlling switch of the plurality of sensing unit and the second controlling switch, respectively for controlling First controlling switch and the second controlling switch timesharing conducting in same sensing unit, and by the first controlling switch transmission of conducting Pumping signal executes sensing operation to sensing electrode, transmits one first reference signal to sensing by the second controlling switch of conducting Electrode.

2. capacitance-type sensing device according to claim 1 it is characterised in that：Described first reference signal and described excitation Signal is identical.

3. capacitance-type sensing device according to claim 1 it is characterised in that：For same row sensing electrode：

When driving the first controlling switch conducting in wherein one sensing unit, the second controlling switch to end when described drive circuit, The first controlling switch cut-off of the part or all of sensing unit in remaining sensing unit, the second controlling switch is driven to turn on.

4. capacitance-type sensing device according to claim 3 it is characterised in that：Described drive circuit passes through the first of conducting Controlling switch provides described pumping signal to execute sensing operation to sensing electrode, and receives the sensing letter from sensing electrode output Number, to execute the sensing operation of self-capacitance.

5. capacitance-type sensing device according to claim 4 it is characterised in that：Described drive circuit includes turntable driving electricity Road, sensing drive circuit and reference signal generation circuit, wherein, described scan drive circuit is used for driving described first control The conducting of switch and described second controlling switch and cut-off, described sensing drive circuit is used for the first controlling switch by conducting Drive sensing electrode execution sensing operation, described reference signal generation circuit is used for providing institute by the second controlling switch of conducting State the second reference signal to sensing electrode.

6. according to claim 1 or 5 capacitance-type sensing device it is characterised in that：When described scan drive circuit drives When the first controlling switch conducting of a line sensing unit, the second controlling switch cut-off, described sensing drive circuit passes through conducting First controlling switch provides described pumping signal to execute sensing operation to section senses electrode simultaneously, and described reference signal produces electricity The first controlling switch that conducting is passed through on road further provides same second reference signal to the part in remaining sensing unit or complete The sensing electrode of portion's sensing unit.

7. capacitance-type sensing device according to claim 6 it is characterised in that：Described second reference signal and described first Reference signal is identical.

8. capacitance-type sensing device according to claim 6 it is characterised in that：Sensing electrode for same a line：Described Drive circuit simultaneously drives section senses electrode execution sensing operation every time, is driven by multiple, until having driven a line to sense Electrode executes sensing operation.

9. capacitance-type sensing device according to claim 6 it is characterised in that：Described drive circuit further includes multiple Data selector, the plurality of data selector connects described reference signal generation circuit and described sensing drive circuit, each Data selector passes through the sensing electrode of the first controlling switch coupling part sensing unit further, and described data selector is used for Select to export described pumping signal or described second reference signal to sensing electrode.

10. capacitance-type sensing device according to claim 9 it is characterised in that：Described drive circuit once passes through simultaneously Each data selector exports described pumping signal respectively to a sensing electrode execution sensing operation, and is divided by each data selector Not export described second reference signal to the part or all of sensing electrode in remaining sensing electrode of a line.

11. capacitance-type sensing devices according to claim 10 it is characterised in that：Described capacitance-type sensing device is further Including control unit, described control unit is connected respectively with described scan drive circuit and the plurality of data selector, is used for Described scan drive circuit is controlled to drive the conducting sequential of the first controlling switch in each row sensing unit and the second controlling switch, And export described pumping signal with described second reference signal to sensing by controlling the plurality of data selector to control The sequential of electrode.

12. capacitance-type sensing devices according to claim 11 it is characterised in that：Described capacitance-type sensing device is further Including：

Multiple scan line groups, described scan line group includes the first scan line and the second scan line；With

Multiple data wire groups, described data wire group includes the first data wire and the second data wire；

Every scan line group connects a line sensing unit, and each data wire group connects string sensing unit；

Described first controlling switch includes coordination electrode, the first transmission electrode and the second transmission electrode；Described second controlling switch Including coordination electrode, the first transmission electrode and the second transmission electrode；Described first scan line connect described scan drive circuit and The coordination electrode of described first controlling switch；Described second scan line connects described scan drive circuit and described second control is opened The coordination electrode closed；Described first data wire connects the first transmission electrode of described data selector and the first controlling switch；Institute State the first transmission electrode that the second data wire connects described reference signal generation circuit and the second controlling switch；Described first control Second transmission electrode of switch connects described sensing electrode；Second transmission electrode of described second controlling switch connects described sensing Electrode.

13. capacitance-type sensing devices according to claim 12 it is characterised in that：Described first data wire is used for transmitting institute State pumping signal and described second reference signal, described second data wire is used for transmitting described first reference signal, described scanning Drive circuit provides scanning open signal to the first controlling switch and the second control by described first scan line, the second scan line Switch, to control the first controlling switch and the conducting of the second controlling switch, to be provided and swept by described first scan line, the second scan line Retouch pick-off signal to the first controlling switch and the second controlling switch, to control the first controlling switch and the cut-off of the second controlling switch.

14. capacitance-type sensing devices according to claim 13 it is characterised in that：Described capacitance-type sensing device is further Including：

First reference signal line, connects described reference signal generation circuit and the second data wire, for transmitting described first reference Signal；Second reference signal line, connects described reference signal generation circuit and the plurality of data selector, described for transmitting Second reference signal；With

Sensing signal line, connects described sensing drive circuit and the plurality of data selector, for transmitting described pumping signal Give sensing drive circuit to sensing electrode and transmission from the sensing signal of sensing electrode.

15. capacitance-type sensing devices according to claim 14 it is characterised in that：Described capacitance-type sensing device includes electricity Capacity sensor, described capacitance type sensor include insulated substrate, the plurality of sensing unit, the plurality of scan line group, The plurality of data wire group and described first reference signal line, the plurality of sensing unit, the plurality of scan line group, The plurality of data wire group and described first reference signal line are formed on described insulated substrate.

16. capacitance-type sensing devices according to claim 15 it is characterised in that：The first control in described each sensing unit System switch and the second controlling switch are thin film transistor switch, and described insulated substrate is glass substrate.

17. capacitance-type sensing devices according to claim 1 it is characterised in that：Described sensing unit includes one first control System switch and one second controlling switch, or, described sensing unit includes 2 first controlling switches being connected in parallel and is connected in parallel 2 second controlling switches.

18. capacitance-type sensing devices according to claim 15 it is characterised in that：Described insulated substrate includes first surface And the second surface being oppositely arranged with first surface, described first surface is used for receiving the touch of target object or close to input, The plurality of sensing unit, the plurality of scan line group, the plurality of data wire group and described first reference signal line set Put in described second surface.

19. capacitance-type sensing devices according to claim 18 it is characterised in that：The sensing electricity of the plurality of sensing unit Pole is compared to described first controlling switch, described second controlling switch, the plurality of scan line group and the plurality of data wire Group is closer to described second surface.

20. capacitance-type sensing device described in 18 is wanted according to right it is characterised in that：Described first controlling switch, described second Controlling switch, the plurality of scan line group and the plurality of data wire group are located at the sensing electricity of the plurality of sensing unit Pole is back to the side of described insulated substrate.

21. capacitance-type sensing devices according to claim 18 it is characterised in that：The sensing electricity of the plurality of sensing unit Pole covers described first controlling switch, described second controlling switch, the plurality of scan line group and the plurality of data line-group Group.

22. capacitance-type sensing devices according to claim 18 it is characterised in that：Described capacitance type sensor wraps further Include described scan drive circuit, the plurality of data selector, described second reference signal line and described sensing signal line, institute State scan drive circuit, the plurality of data selector, described second reference signal line and described sensing signal line and be formed at institute State on the second surface of insulated substrate.

23. capacitance-type sensing devices according to claim 22 it is characterised in that：Described scan drive circuit, described many Individual data selector, described second reference signal line and described sensing signal line are arranged on around the plurality of sensing unit.

24. capacitance-type sensing devices according to claim 22 it is characterised in that：Described scan drive circuit and described many Individual data selector all includes controlling switch, and described controlling switch is thin film transistor switch.

25. capacitance-type sensing devices according to claim 9 it is characterised in that：Each data selector includes multiple opening Close unit, each switch element includes first choice switch and the second selecting switch, described first choice switch includes controlling electricity Pole, the first transmission electrode and the second transmission electrode, described second selecting switch includes coordination electrode, the first transmission electrode and Two transmission electrodes, wherein, coordination electrode and the coordination electrode of the second selecting switch and described control that described first choice switchs Unit connects respectively, and the first transmission electrode of described first choice switch is connected with described sensing drive circuit, described second choosing The first transmission electrode selecting switch is connected with described reference signal generation circuit, the second transmission electrode of described first choice switch It is connected with the second transmission electrode of described second selecting switch and connect to the first data wire.

26. capacitance-type sensing devices according to claim 25 it is characterised in that：Described control unit controls same switch First choice switch in unit and the second selecting switch timesharing conducting.

27. capacitance-type sensing devices according to claim 18 it is characterised in that：Described capacitance type sensor wraps further Include passivation layer, be formed at the plurality of sensing unit, the plurality of scan line group, the plurality of data wire group and described On first reference signal line.

28. capacitance-type sensing devices according to claim 27 it is characterised in that：Described capacitance-type sensing device is further Including control chip, described control chip includes described control unit, described reference signal generation circuit and described sensing and drives Circuit.

29. capacitance-type sensing devices according to claim 28 it is characterised in that：Described capacitance type sensor and described control Coremaking piece is respectively nude film, and described control chip is bundled on described insulated substrate；Or, it is soft that described control chip is arranged on one On property circuit board, electrically connected with described capacitance type sensor by described flexible circuit board.

30. capacitance-type sensing devices according to claim 6 it is characterised in that：Described drive circuit further includes to adjust Circuit processed, described modulation circuit exports to the signal of the plurality of sensing unit for drive circuit described in uniform modulation, to carry The signal to noise ratio of high sensing signal.

31. capacitance-type sensing devices according to claim 1 it is characterised in that：Described capacitance-type sensing device is fingerprint Sensing device.

32. a kind of electronic equipments, including the capacitance-type sensing device described in any one in claim 1-31.