CN209803816U - Capacitive Sensors and Electronics - Google Patents

Abstract

the utility model discloses a capacitanc sensor and electronic equipment. The capacitive sensor includes a substrate, a plurality of first sense electrodes, and a plurality of second sense electrodes. The plurality of first sensing electrodes are formed on the substrate for capacitively coupling to a fingerprint of a target object. The plurality of second sensing electrodes are formed on the substrate for capacitively coupling to sweat pores of a target object, wherein a size of the plurality of second sensing electrodes is smaller than a size of the plurality of first sensing electrodes. The electronic device includes the capacitive sensor.

Description

Capacitive Sensors and Electronics

technical field

The utility model relates to the technical field of biological feature sensing, in particular to a capacitive sensor capable of detecting living bodies and electronic equipment.

Background technique

At present, fingerprint sensors have gradually become the standard configuration of electronic devices. Please refer to FIG. 1 , which is a schematic structural diagram of a sensing array of a fingerprint sensor in the prior art. The capacitive sensor 1 includes a substrate 10 and a sensing array 11 formed on the substrate 10 . The sensing array 11 includes a plurality of sensing electrodes 13 . The plurality of sensing electrodes 13 are used to capacitively couple to the fingerprint of the target object. It can be seen that the dimensions of the plurality of sensing electrodes 13 are the same and relatively larger. For example, the resolution of the sensor array 10 is 500dpi. The larger the size of the sensing electrode 13, the larger the amount of captured signal, and the better the signal-to-noise ratio, but it can only be used to collect the ridge and valley information of the fingerprint, and cannot capture these finer creatures such as sweat pores. characteristic information.

Correspondingly, the user can deceive the existing capacitive fingerprint sensor 1 by using a false finger print, which is a relatively large security risk for the user. Therefore, it is necessary to provide a capacitive sensor capable of detecting a living body.

Utility model content

In order to solve the above technical problems, the utility model provides a capacitive sensor and electronic equipment capable of detecting living bodies.

In order to achieve the above object, the utility model provides the following technical solutions:

A capacitive sensor comprising:

Substrate;

a plurality of first sensing electrodes formed on the substrate for capacitively coupling to a fingerprint of a target object;

a plurality of second sensing electrodes formed on the substrate for capacitively coupling to sweat pores of the target object, wherein the plurality of second sensing electrodes are smaller in size than the plurality of first sensing electrodes The size of the sensing electrode.

Optionally, the plurality of second sensing electrodes are further capacitively coupled to the fingerprint of the target object.

Optionally, the plurality of first sensing electrodes is arranged around the plurality of second sensing electrodes.

Optionally, the multiple second sensing electrodes are arranged in an array, and the multiple first sensing electrodes are arranged around the array.

Optionally, the plurality of second sensing electrodes are located in a central region on the substrate.

Optionally, the resolution of the plurality of second sensing electrodes is half of the resolution of the plurality of first sensing electrodes, or, the size of the plurality of second sensing electrodes is the size of the plurality of half the size of the first sensing electrode.

Optionally, the substrate is a silicon substrate.

Optionally, the capacitive sensor further includes a driving circuit, the driving circuit is respectively connected to the plurality of first sensing electrodes and the plurality of second sensing electrodes, and the driving circuit is used to provide a driving signal To the plurality of first sensing electrodes and the plurality of second sensing electrodes, and receiving the first sensing signals output from the plurality of first sensing electrodes and the output signals from the plurality of second sensing electrodes The second sensing signal output by the electrodes.

Optionally, the capacitive sensor further includes a processing circuit, the processing circuit is connected to the driving circuit, and is used to obtain fingerprint information of the target object according to the first sensing signal, and to obtain fingerprint information according to the second sensing signal. Obtain the sweat pore information of the target object.

Optionally, the processing circuit judges whether the target object touching the capacitive sensor is a living body according to the sweat pore information.

Optionally, when the processing circuit determines that the target object is a living body, it further confirms whether the fingerprint information sensed by the capacitive sensor matches the prestored fingerprint information.

Optionally, the capacitive sensor performs living body sensing first, and then starts fingerprint sensing when it is judged that the target object is a living body; or, the capacitive sensor performs living body and fingerprint sensing at the same time.

Optionally, the plurality of second sensing electrodes are arranged in a first array, the plurality of first sensing electrodes are arranged in a second array, the resolution of the first array is 1000dpi, and the first array has a resolution of 1000dpi. The resolution of the second array is 500dpi.

Optionally, the plurality of second sensing electrodes are arranged in a plurality of first arrays, and the first sensing electrodes are arranged between the plurality of first arrays.

The utility model also provides an electronic device, including the capacitive sensor described in any one of the above.

Since the capacitive sensor of the present application further includes a plurality of second sensing electrodes having a size smaller than the plurality of first sensing electrodes, the plurality of second sensing electrodes are used to capacitively couple to the sweat pores of the target, Therefore, the capacitive sensor can further sense tiny biometric information such as sweat pores of the target object. Since fake finger prints do not have sweat pore information, the capacitive sensor can sense a living body.

Correspondingly, the security of the electronic equipment with the capacitive sensor is high.

While a number of embodiments are disclosed, including variations thereof, still other embodiments of the present disclosure will become apparent to those skilled in the art from the following detailed description which shows and describes illustrative embodiments of the present disclosure. As will be realized, the present disclosure is capable of modification in various obvious respects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.

Description of drawings

The features and advantages of the present invention will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a sensing array of a fingerprint sensor in the prior art.

FIG. 2 is a schematic structural diagram of an embodiment of a sensing array of a capacitive sensor of the present invention.

Fig. 3 is a structural schematic diagram of another embodiment of the sensing array of the capacitive sensor of the present invention.

Fig. 4 is a circuit block diagram of the capacitive sensor of the present invention.

FIG. 5 is a schematic structural diagram of the electronic device of the present invention.

Detailed ways

Example embodiments will now be described more fully with reference to 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 incorporate the concepts of example embodiments. communicated 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. In addition, the size of elements does not entirely reflect an actual size, and the number of related elements does not entirely reflect an actual number.

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 should appreciate that the technical solutions of the present invention can also 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.

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention to users, but should not be construed as limitations of the present invention.

In describing the present invention, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal" , "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating Or imply that the referenced position or element must have a specific method, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

Further, in the description of the present utility model, it should be understood that: "plurality" includes two and more than two, unless otherwise specifically defined in the present utility model. In addition, words such as "first", "second", and "third" 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 clearly distinguishing components. Make the description more concise.

Please refer to FIG. 2 . FIG. 2 is a structural diagram of an embodiment of a sensing array of a capacitive sensor of the present invention. The capacitive sensor 4 includes a substrate 20 and a sensing array 21 formed on the substrate 20 . The sensing array 21 includes a plurality of first sensing electrodes 22 and a plurality of second sensing electrodes 24 . The plurality of first sensing electrodes 22 are formed on the substrate 20 for capacitive coupling to sweat pores of a target object. The plurality of second sensing electrodes 24 are formed on the substrate 20 for capacitive coupling to sweat pores of a target object. Wherein, the size of the plurality of second sensing electrodes 24 is smaller than the size of the plurality of first sensing electrodes 22 . The target object is, for example, a human body or the like.

The plurality of second sensing electrodes 24 are further capacitively coupled to the fingerprint of the target object.

In this embodiment, the plurality of first sensing electrodes 22 are arranged around the plurality of second sensing electrodes 24 . Preferably, the plurality of second sensing electrodes 24 are arranged in a first array, and the plurality of first sensing electrodes 22 are arranged around the first array.

Further, the plurality of first sensing electrodes 22 are arranged in a second array, for example. The first array is located within the second array. For example, the plurality of second sensing electrodes 24 are located in the middle region of the substrate 20 .

In this embodiment, the resolution of the plurality of second sensing electrodes 24 is half of the resolution of the plurality of first sensing electrodes 22, or, the size of the plurality of second sensing electrodes 24 is half the size of the plurality of first sensing electrodes 22 .

Due to the small size of the second sensing electrode 24, the second sensing electrode 24 can further conduct capacitive coupling with tiny biological feature structures such as sweat pores.

Optionally, the resolution of the first array is 1000dpi, and the resolution of the second array is 500dpi.

The substrate 20 is, for example but not limited to, a silicon substrate.

Please refer to FIG. 3 . FIG. 3 is a schematic structural diagram of another embodiment of the sensing array of the capacitive sensor of the present invention. The structure of the sensing array 31 of the capacitive sensor 4 is substantially the same as that of the sensing array 21 of the capacitive sensor. The main difference between the two is that the multiple second sensing electrodes 34 of the capacitive sensor 4 are A plurality of first arrays are arranged, and the first sensing electrodes 32 are arranged between the plurality of first arrays.

Since the sensing array 31 of the capacitive sensor includes a plurality of first arrays arranged at intervals, the sensing array 31 of the capacitive sensor 4 can more accurately sense biometric information such as sweat pores of a target object.

However, alternatively, in addition to the sensing arrays 2 and 3 of the above-mentioned embodiments listed in this application, the sensing arrays of the capacitive sensors of this application can also be arranged in other structures, as long as the sensing array includes a size smaller than The first sensing electrode, the second sensing electrode, and the technical idea for capacitive coupling with sweat pores should all fall within the protection scope of the present application.

Please refer to FIG. 4 . FIG. 4 is a circuit block diagram of the capacitive sensor of the present invention. The capacitive sensor 4 includes a sensing array and a driving circuit 40 . The sensing array is, for example, the aforementioned sensing array 21 or sensing array 31 . The sensing array 31 is taken as an example for description below. The driving circuit 40 is connected to the plurality of first sensing electrodes 32 and the plurality of second sensing electrodes 34 respectively, and the driving circuit 40 is used to provide driving signals to the plurality of first sensing electrodes 32 and the plurality of second sensing electrodes 34, and receive the first sensing signals output from the plurality of first sensing electrodes 32 and the second sensing signals output from the plurality of second sensing electrodes 34. test signal.

It should be noted that, in FIG. 4, only the connection relationship between the drive circuit and part of the first sensing electrodes 32 and part of the second sensing electrodes 34 is shown, however, the rest of the first sensing electrodes 32 and the second sensing electrodes The connection relationship between the sensing electrodes 34 and the driving circuit 40 is similar to that shown in FIG. 4 , and each first sensing electrode 32 and each second sensing electrode 34 are respectively connected to the driving circuit 40 .

Preferably, in this embodiment, the driving circuit 40 is used to drive the plurality of first sensing electrodes 32 and the plurality of second sensing electrodes 34 to perform self-capacitance sensing.

The capacitive sensor 4 further includes a processing circuit 42, the processing circuit 42 is connected to the drive circuit 40, and is used to obtain fingerprint information of the target object according to the first sensing signal, and to obtain fingerprint information of the target object according to the second sensing signal. Obtain the sweat pore information of the target object.

Since a prosthesis such as a fingerprint film generally does not have sweat pore information, but a living body has sweat pore information, so the processing circuit 42 judges whether the target object touching the capacitive sensor 4 is a living body according to the sweat pore information.

The capacitive sensor includes a storage circuit (not shown in the figure), and the storage circuit is used for pre-storing fingerprint information. When the processing circuit 42 determines that the target object is a living body, it further confirms whether the fingerprint information sensed by the capacitive sensor 4 matches the pre-stored fingerprint information. When the fingerprint information sensed by the capacitive sensor 4 matches the pre-stored fingerprint information, it can be determined that the target object is an authenticator or a real user.

In some practical manners, the capacitive sensor 4 firstly performs living body sensing, and then starts fingerprint sensing when it is judged that the target object is a living body. This saves power consumption. However, in some other practical ways, the capacitive sensor 4 can be changed, for example, to simultaneously perform living body and fingerprint sensing. This is also possible.

Please refer to FIG. 5 . FIG. 5 is a schematic structural diagram of an embodiment of the electronic device of the present application. The electronic device 100 is, for example, various suitable products such as mobile terminals, portable electronic products, vehicle-mounted electronic products, and smart home products. In the following, description will be made by taking the electronic device 100 as a mobile phone as an example.

The handset 100 includes a capacitive sensor 4 . The capacitive sensor 4 is used for sensing fingerprint and sweat pore information. When the mobile phone 100 judges that the target object is a living body according to the sweat pore information sensed by the capacitive sensor 4, and judges that the detected fingerprint information is the fingerprint information of the preset target object, the mobile phone executes functions such as unlocking or payment. Correspondingly, the security of the mobile phone 100 is relatively high.

Although the present disclosure has been described with reference to various embodiments, it will be understood that these embodiments are illustrative and that the scope of the present invention is not limited thereto. Many variations, modifications, additions, and improvements are possible. More generally, embodiments disclosed in accordance with the present disclosure are described in the context of specific embodiments. Functions may be separated or combined in different ways in the process of various embodiments disclosed in the present invention, or described by using different terms. These and other changes, modifications, additions, and improvements may be within the scope of the present disclosure as defined by the following claims.

Claims (12)

1. A capacitive sensor, characterized by: the method comprises the following steps:

A substrate;

A plurality of first sensing electrodes formed on the substrate for capacitively coupling to a fingerprint of a target object; a plurality of second sensing electrodes formed on the substrate for capacitively coupling to sweat pores of a target object, wherein a size of the plurality of second sensing electrodes is smaller than a size of the plurality of first sensing electrodes.

2. A capacitive sensor according to claim 1 wherein: the plurality of second sensing electrodes is further configured to capacitively couple to a fingerprint of a target object.

3. A capacitive sensor according to claim 1 wherein: the plurality of first sensing electrodes are disposed around the plurality of second sensing electrodes.

4. A capacitive sensor according to claim 3 wherein: the plurality of second sensing electrodes are arranged in a first array, and the plurality of first sensing electrodes are arranged around the first array.

5. The capacitive sensor of claim 4, wherein: the plurality of second sensing electrodes are located in a central region on the substrate.

6. A capacitive sensor according to claim 1 wherein: the resolution of the plurality of second sensing electrodes is half of the resolution of the plurality of first sensing electrodes, or the size of the plurality of second sensing electrodes is half of the size of the plurality of first sensing electrodes.

7. A capacitive sensor according to claim 1 wherein: the substrate is a silicon substrate.

8. The capacitive sensor of any one of claims 1-7, wherein: the capacitive sensor further comprises a driving circuit, the driving circuit is connected with the plurality of first sensing electrodes and the plurality of second sensing electrodes respectively, and the driving circuit is used for providing driving signals to the plurality of first sensing electrodes and the plurality of second sensing electrodes and receiving first sensing signals output from the plurality of first sensing electrodes and second sensing signals output from the plurality of second sensing electrodes.

9. A capacitive sensor according to claim 8 wherein: the capacitive sensor further comprises a processing circuit, wherein the processing circuit is connected with the driving circuit and is used for acquiring fingerprint information of a target object according to the first sensing signal and acquiring sweat pore information of the target object according to the second sensing signal.

10. A capacitive sensor according to claim 1 wherein: the plurality of second sensing electrodes are arranged in a first array, the plurality of first sensing electrodes are arranged in a second array, the resolution of the first array is 1000dpi, and the resolution of the second array is 500 dpi.

11. The capacitive sensor of claim 4, wherein: the plurality of second sensing electrodes are arranged in a plurality of first arrays, and the first sensing electrodes are arranged among the plurality of first arrays.

12. An electronic device, characterized in that: comprising a capacitive sensor according to any one of claims 1-11.