CN107967464B - Capacitive sensor and electronic device - Google Patents
Capacitive sensor and electronic device Download PDFInfo
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- CN107967464B CN107967464B CN201711331699.XA CN201711331699A CN107967464B CN 107967464 B CN107967464 B CN 107967464B CN 201711331699 A CN201711331699 A CN 201711331699A CN 107967464 B CN107967464 B CN 107967464B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
Abstract
The invention discloses a capacitive sensor and an electronic device. 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
Technical Field
The present invention relates to the field of biometric sensing technologies, and in particular, to a capacitive sensor and an electronic device capable of detecting a living body.
Background
At present, fingerprint sensors have gradually become the standard of electronic devices. Referring to fig. 1, fig. 1 is a schematic structural diagram of a sensor 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 comprises a plurality of sensing electrodes 13. The plurality of sensing electrodes 13 are for capacitively coupling to the fingerprint of the target object. It can be seen that the plurality of sensing electrodes 13 are the same size and are relatively large in size. For example, the resolution of the sensing array 10 is 500 dpi. 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 the sensing electrode can only be used for collecting the ridge and valley information of the fingerprint, and can not capture the finer biometric information such as sweat pores.
Accordingly, the user can fool the existing capacitive fingerprint sensor 1 using a fake finger print, which is a great safety hazard for the user. Therefore, it is necessary to provide a capacitive sensor capable of detecting a living body.
Disclosure of Invention
In order to solve the above-described technical problems, the present invention provides a capacitive sensor and an electronic apparatus capable of detecting a living body.
In order to achieve the purpose, the invention provides the following technical scheme:
a capacitive sensor, comprising:
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.
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 are disposed around the plurality of second sensing electrodes.
Optionally, the plurality of second sensing electrodes are arranged in an array, and the plurality of 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 half of the size of the plurality of first sensing electrodes.
Optionally, the substrate is a silicon substrate.
Optionally, the capacitive sensor further includes a driving circuit, the driving circuit is connected to the plurality of first sensing electrodes and the plurality of second sensing electrodes, respectively, and the driving circuit is configured to provide driving signals to the plurality of first sensing electrodes and the plurality of second sensing electrodes, and receive first sensing signals output from the plurality of first sensing electrodes and second sensing signals output from the plurality of second sensing electrodes.
Optionally, the capacitive sensor further comprises a processing circuit, connected to the driving circuit, for acquiring fingerprint information of the target object according to the first sensing signal, and acquiring sweat pore information of the target object according to the second sensing signal.
Optionally, the processing circuit determines whether the target object contacting 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 is further determined whether the fingerprint information sensed by the capacitive sensor matches with pre-stored fingerprint information.
Optionally, the capacitive sensor performs living body sensing first, and starts fingerprint sensing when the target object is determined to be a living body; alternatively, the capacitive sensor performs live and fingerprint sensing simultaneously.
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 resolution of the second array is 500 dpi.
Optionally, the plurality of second sensing electrodes are arranged in a plurality of first arrays, and the first sensing electrodes are disposed between the plurality of first arrays.
The invention also provides electronic equipment comprising the capacitive sensor.
Since the capacitive sensor of the present application further includes a plurality of second sensing electrodes having a smaller size than the plurality of first sensing electrodes, the plurality of second sensing electrodes are configured to be capacitively coupled to the sweat pores of the target, and thus, the capacitive sensor can further sense minute biometric information such as sweat pores of the target object. Since the fake finger print does not have sweat pore information, the capacitive sensor can sense a living body.
Accordingly, the safety of the electronic device having the capacitive sensor is high.
While multiple embodiments are disclosed, including variations thereof, other embodiments of the disclosure will be apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the disclosure. It will be recognized that 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 as restrictive.
Drawings
The features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic diagram of a sensing array of a prior art fingerprint sensor.
Fig. 2 is a schematic structural diagram of a sensing array of a capacitive sensor according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of another embodiment of a sensor array of a capacitive sensor according to the present invention.
Fig. 4 is a block circuit diagram of a capacitive sensor of the present invention.
Fig. 5 is a schematic structural diagram of an electronic device according to the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The thickness and size of each layer shown in the drawings may be exaggerated, omitted, or schematically shown for convenience or clarity, and the number of relevant elements may be schematically shown. In addition, the size of an element does not fully reflect the actual size, and the number of related elements does not fully reflect the actual number.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended for the user to explain the present invention and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the positions or elements referred to must have a particular method, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Further, in the description of the present invention, it is to be understood that: "plurality" includes two and more than two unless the invention is specifically limited otherwise. In addition, the terms such as "first", "second", "third", and the like appearing in the names of the elements and the names of the signals do not limit the sequence of the elements or the signals, but are used for facilitating the naming of the elements and clearly distinguishing the elements, so that the description is more concise.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a sensor array of a capacitive sensor according to an embodiment 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 capacitively coupling to sweat pores of a target object. The plurality of second sensing electrodes 24 are formed on the substrate 20 for capacitively 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 the present embodiment, the plurality of first sensing electrodes 22 are disposed 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 a central region on the substrate 20.
In this embodiment, the resolution of the plurality of second sensor electrodes 24 is half of the resolution of the plurality of first sensor electrodes 22, or the size of the plurality of second sensor electrodes 24 is half of the size of the plurality of first sensor electrodes 22.
Since the second sensing electrode 24 has a small size, the second sensing electrode 24 can be further capacitively coupled to a minute biological feature structure such as a sweat pore.
Optionally, the resolution of the first array is 1000dpi and the resolution of the second array is 500 dpi.
The substrate 20 is, for example, but not limited to, a silicon substrate.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a sensor array of a capacitive sensor according to another embodiment of the present invention. The sensing array 31 of capacitive sensors 4 is substantially identical in structure to the sensing array 21 of capacitive sensors, the main difference being: the plurality of second sensing electrodes 34 of the capacitive sensor 4 are arranged in a plurality of first arrays, and the first sensing electrodes 32 are disposed 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 sense biometric information such as sweat pores of a target object more accurately.
However, alternatively, besides the sensing arrays 2 and 3 of the above embodiments listed in the present application, the sensing array of the capacitive sensor of the present application may also have other arrangement structures, as long as the sensing array includes the second sensing electrode having a smaller size than the first sensing electrode, and the technical idea for performing capacitive coupling with the sweat pores is within the scope of the present application.
Referring to fig. 4, fig. 4 is a circuit block diagram of a capacitive sensor according to the present invention. The capacitive sensor 4 includes a sensing array and a drive circuit 40. Such as the sensing array 21 or the sensing array 31 described above. The following description will take the sensor array 31 as an example. 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 configured to provide driving signals to the plurality of first sensing electrodes 32 and the plurality of second sensing electrodes 34, and receive first sensing signals output from the plurality of first sensing electrodes 32 and second sensing signals output from the plurality of second sensing electrodes 34.
It should be noted that, in fig. 4, only the connection relationship between the driving circuit and a part of the first sensing electrodes 32 and a part of the second sensing electrodes 34 is shown, however, the connection relationship between the remaining first sensing electrodes 32 and second sensing electrodes 34 and the driving circuit 40 is similar to the connection relationship shown in fig. 4, and each first sensing electrode 32 and each second sensing electrode 34 are respectively connected with the driving circuit 40.
Preferably, in the present embodiment, the driving circuit 40 is configured 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 comprises a processing circuit 42, wherein the processing circuit 42 is connected to the driving circuit 40, and is configured to obtain fingerprint information of the target object according to the first sensing signal and obtain sweat pore information of the target object according to the second sensing signal.
Since a prosthesis such as a fingerprint film generally does not have sweat pore information, but a living body has sweat pore information, the processing circuit 42 determines whether a target object contacting the capacitive sensor 4 is a living body based on the sweat pore information.
The capacitive sensor comprises a memory circuit (not shown) for pre-storing fingerprint information. When the processing circuit 42 determines that the target object is a living body, it is further determined whether the fingerprint information sensed by the capacitive sensor 4 matches with the pre-stored fingerprint information. When the fingerprint information sensed by the capacitive sensor 4 matches with the pre-stored fingerprint information, it may be determined that the target object is an authenticator or a true user.
In some implementations, the capacitive sensor 4 performs living body sensing, for example, and starts fingerprint sensing when the target object is determined to be a living body. This saves power consumption. However, in other implementations, it may be altered that the capacitive sensor 4 performs, for example, live and fingerprint sensing simultaneously. As such, it is also possible.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of an electronic device according to the present application. The electronic device 100 is, for example, a mobile terminal, a portable electronic product, a vehicle-mounted electronic product, a smart home product, or other suitable products. The electronic device 100 is taken as a mobile phone as an example for explanation.
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 determines that the target object is a living body according to the sweat pore information sensed by the capacitive sensor 4 and determines that the detected fingerprint information is the preset fingerprint information of the target object, the mobile phone performs functions of unlocking, payment or the like. Accordingly, the security of the handset 100 is high.
While 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 invention is not limited to them. Many variations, modifications, additions, and improvements are possible. More generally, embodiments in accordance with the present disclosure are described in the context of particular embodiments. The functions may be separated or combined in different ways or described using different terminology in the processes in the embodiments disclosed in the present invention. These and other variations, modifications, additions, and improvements may fall within the scope of the disclosure as defined in the claims that follow.
Claims (15)
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 9 wherein: the processing circuit judges whether the target object contacting the capacitive sensor is a living body according to the sweat pore information.
11. A capacitive sensor according to claim 10 wherein: when the processing circuit judges that the target object is a living body, whether the fingerprint information sensed by the capacitive sensor is matched with the pre-stored fingerprint information is further confirmed.
12. A capacitive sensor according to claim 10 wherein: the capacitive sensor firstly performs living body sensing, and when the target object is judged to be a living body, fingerprint sensing is started; alternatively, the capacitive sensor performs live and fingerprint sensing simultaneously.
13. 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.
14. The capacitive sensor of claim 4, wherein: the plurality of second sensing electrodes are arranged in a plurality of first arrays, and one or more first sensing electrodes are arranged among the plurality of first arrays.
15. An electronic device, characterized in that: comprising a capacitive sensor according to any one of claims 1-14.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106104574A (en) * | 2016-02-25 | 2016-11-09 | 深圳市汇顶科技股份有限公司 | Fingerprint identification method, device and terminal |
| CN106257926A (en) * | 2015-06-16 | 2016-12-28 | 旭景科技股份有限公司 | For intelligent television or the remote controller of Set Top Box |
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| KR102336492B1 (en) * | 2015-05-28 | 2021-12-08 | 엘지디스플레이 주식회사 | Finger sensor integrated type touch screen panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106257926A (en) * | 2015-06-16 | 2016-12-28 | 旭景科技股份有限公司 | For intelligent television or the remote controller of Set Top Box |
| CN106104574A (en) * | 2016-02-25 | 2016-11-09 | 深圳市汇顶科技股份有限公司 | Fingerprint identification method, device and terminal |
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Address after: 518055 room 2104, Kim Chi Chi house, 1 Tong Ling Road, Taoyuan street, Shenzhen, Guangdong, Nanshan District Applicant after: Shenzhen Xinwei Biological Identification Technology Co., Ltd. Address before: 518055 Shenzhen, Nanshan District, Guangdong Xili Street Honghua Ling Industrial Zone 2 District 1 District 5 Building (Xi Bian) Applicant before: Shenzhen Xinwei Biological Identification Technology Co., Ltd. |
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Effective date of registration: 20210315 Address after: 545000 No.108, 2nd floor, building 2, 29 Xinliu Avenue, Liuzhou City, Guangxi Zhuang Autonomous Region Patentee after: Liuzhou Zibo Technology Co.,Ltd. Address before: 518055 room 2104, Kim Chi Chi house, 1 Tong Ling Road, Taoyuan street, Shenzhen, Guangdong, Nanshan District Patentee before: SHENZHEN XINWEISHENGWUSHIBIE TECHNOLOGY Co.,Ltd. |