CN104751106A - Fingerprint sensor and control method for fingerprint sensor - Google Patents
Fingerprint sensor and control method for fingerprint sensor Download PDFInfo
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- CN104751106A CN104751106A CN201310744446.0A CN201310744446A CN104751106A CN 104751106 A CN104751106 A CN 104751106A CN 201310744446 A CN201310744446 A CN 201310744446A CN 104751106 A CN104751106 A CN 104751106A
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Abstract
The invention discloses a fingerprint sensor and a control method for the fingerprint sensor. The fingerprint sensor comprises a fingerprint detection panel, a fingerprint detection region located on the fingerprint detection panel, a conductor layer arranged on the fingerprint detection panel for generating induction capacitance between the conductor layer and a finger when the finger gets close to the fingerprint detection region, a capacitance detection module used for detecting induction capacitance, and a control module used for judging the distance between the finger and each of several fingerprint detection units according to the induction capacitance change trend and controlling the fingerprint detection units to start working to scan the fingerprint when the distance is smaller than a preset value, wherein the fingerprint detection units are arranged in the fingerprint detection region. The fingerprint sensor has advantages of low power consumption and energy saving.
Description
Technical field
The present invention relates to identification control technology, particularly, relate to the control method of a kind of fingerprint sensor and fingerprint sensor.
Background technology
Semiconductor fingerprint sensor is widely used in identification field.Semiconductor fingerprint sensor carries out fingerprint detection according to the electric capacity formed between finger surface and fingerprint detection panel usually.As shown in Figure 1, show existing a kind of fingerprint sensor 1, wherein, fingerprint detection pixel 2 completes the detection of single fingerprint pixel, fingerprint sensor frame 3 is generally used for launching pumping signal to finger 5, and fingerprint detection region 4 has been covered with fingerprint detection pixel 2.When fingerprint sensor 1 is in normal mode of operation, on fingerprint detection region 4, surface sweeping is carried out on detection pixel 2 pairs of fingerprint surfaces of distribution, distinguishes ridge and the paddy of fingerprint, obtains the picture signal of fingerprint.Fingerprint detection pixel 2 completes detection and the enlarging function of fingerprint signal.Resolution due to fingerprint detection pixel 2 is greater than fingerprint resolution, and very many fingerprint detection pixels 2 that fingerprint detection region 4 distributes are to meet the requirement of fingerprint image resolution.
But in the wait fingerprint authentication stage, fingerprint detection pattern is in normally open, all detection pixels 2 namely on fingerprint detection region 4 constantly carry out fingerprint detection, can complete detection and the judgement of fingerprint when having finger to be positioned on fingerprint detection region 4 with box lunch fast.But, wait for that the fingerprint authentication stage is to the process completing fingerprint detection from entering, the actual time of carrying out shared by fingerprint detection is little, what most of the time detected is all useless signal, cause very large power wastage like this, the power that the fingerprint detection pixel 2 on whole fingerprint detection region 4 consumes is larger.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, one object of the present invention is to propose a kind of fingerprint sensor, and this fingerprint sensor has advantage low in energy consumption.
Another object of the present invention is to the control method proposing a kind of fingerprint sensor.
To achieve these goals, a first aspect of the present invention embodiment provides a kind of fingerprint sensor, comprising: fingerprint detection panel; Be positioned at the fingerprint detection region on described fingerprint detection panel, be provided with multiple fingerprint detection unit in described fingerprint detection region, described multiple fingerprint detection unit distributes in many row's multiple rows on described fingerprint detection region; Conductor layer, described conductor layer is arranged on described fingerprint detection panel, with when pointing near described fingerprint detection region, between described conductor layer and described finger, produces inductance capacitance; Capacitive detection module, for detecting described inductance capacitance; Control module, described control module is connected with capacitive detection module with described multiple fingerprint detection unit, conductor layer respectively, for judging the distance between described finger and described multiple fingerprint detection unit according to the variation tendency of described inductance capacitance, and when described distance is less than preset value, controls described multiple fingerprint detection unit and start working with scanning fingerprint.
According to the fingerprint sensor of the embodiment of the present invention, finger is made between conductor layer and finger, to produce inductance capacitance in time detecting panel by arranging conductor layer, due to finger more proximity test panel, the inductance capacitance formed between conductor layer and finger is larger, therefore, can judge to point the distance between detection panel according to inductance capacitance size variation, and when pointing and detect the distance between panel and being very little, think that finger has the intention of being carried out fingerprint surface sweeping by fingerprint sensor, now, multiple fingerprint detection unit is started working and carries out finger scan, when pointing and detect the distance between panel and being larger, multiple fingerprint detection unit is quit work.Thus, effectively can reduce the working time of multiple fingerprint detection unit, reduce the power consumption of fingerprint detection unit, make fingerprint sensor have low in energy consumption, energy-conservation advantage.
The embodiment of second aspect present invention provides a kind of control method of fingerprint sensor, comprises the following steps: detect between conductor layer and finger and produce inductance capacitance; The distance between described finger and described multiple fingerprint detection unit is judged according to the variation tendency of described inductance capacitance; And when described distance is less than preset value, controls described multiple fingerprint detection unit and start working with scanning fingerprint.
According to the control method of the fingerprint sensor of the embodiment of the present invention, judge that whether the distance pointed and detect between panel is less according to the inductance capacitance formed between conductor layer and finger, and when less, make multiple fingerprint detection unit start working carry out finger scan, when pointing and detect the distance between panel and being larger, multiple fingerprint detection unit is quit work.Thus, effectively can reduce the working time of multiple fingerprint detection unit, reduce the power consumption of fingerprint detection unit, make fingerprint sensor have low in energy consumption, energy-conservation advantage.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the schematic diagram that existing a kind of fingerprint sensor carries out fingerprint detection;
Fig. 2 is that fingerprint sensor carries out the schematic diagram of fingerprint detection according to an embodiment of the invention;
Fig. 3 is that fingerprint sensor carries out the schematic diagram of fingerprint detection in accordance with another embodiment of the present invention;
Fig. 4 is that fingerprint sensor detects whether there is finger near the schematic diagram detecting panel according to an embodiment of the invention; And
Fig. 5 is the process flow diagram of the control method of fingerprint sensor according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Describe according to the fingerprint sensor of the embodiment of the present invention and the control method of fingerprint sensor below in conjunction with accompanying drawing.
Fig. 2 is that fingerprint sensor carries out the schematic diagram of fingerprint detection according to an embodiment of the invention.Fig. 3 is that fingerprint sensor carries out the schematic diagram of fingerprint detection in accordance with another embodiment of the present invention.Fig. 4 is that fingerprint sensor detects whether there is finger near the schematic diagram detecting panel according to an embodiment of the invention.
As shown in Figure 2, Figure 3 and Figure 4, fingerprint sensor 200 according to an embodiment of the invention, comprising: fingerprint detection panel 210, fingerprint detection region 220, conductor layer 230, capacitive detection module 240 and control module (not shown).
Wherein, fingerprint detection region 220 is positioned on fingerprint detection panel 210, is provided with multiple fingerprint detection unit 221 in fingerprint detection region 220, and multiple fingerprint detection unit 221 distributes in many row's multiple rows on fingerprint detection region 220.Conductor layer 230 is arranged on fingerprint detection panel 210, with when pointing near fingerprint detection region 220, between conductor layer 230 and finger, produces inductance capacitance.Capacitive detection module 240, for detecting inductance capacitance, namely detects and produce inductance capacitance between conductor layer 230 and finger.Control module is connected with capacitive detection module 240 with multiple fingerprint detection unit 221, conductor layer 230 respectively, for judging the distance between finger and multiple fingerprint detection unit 221 according to the variation tendency of inductance capacitance, and when distance is less than preset value, controls multiple fingerprint detection unit 221 and start working with scanning fingerprint.
Further, control module also for when judging that the distance between finger 5 and multiple fingerprint detection unit 221 is not less than preset value (as 1 centimetre), controlling multiple fingerprint detection unit 221 and quitting work.
Below in conjunction with Fig. 4, the principle of work of the fingerprint sensor of the embodiment of the present invention is described in detail.
As shown in Figure 4, composition graphs 2 and Fig. 3, according to manikin, finger 5 is equivalent to earth potential (GND), constitutes the top crown of inductance capacitance Cx, and the bottom crown of inductance capacitance Cx is by being positioned at below fingerprint detection region 220 or the conductor layer 230 of surrounding is formed.When not having finger 5 above fingerprint detection region 220, inductance capacitance Cx approach infinity is little; When there being finger 5 near fingerprint detection region 220, finger 5 and conductor layer 230 constitute inductance capacitance Cx.Detected the situation of change of inductance capacitance Cx by capacitive detection module 240, just can judge whether there is finger 5 near fingerprint detection region 220.
As from the foregoing, only need a conductor layer 230 and a capacitive detection module 240(as realized capacitive detection module 240 by testing circuit) detect inductance capacitance Cx, and judge that whether finger 5 is more and more near fingerprint detection region 220 according to the variation tendency of inductance capacitance Cx size, namely judge that fingerprint detection region 220 is the need of carrying out fingerprint detection, when finger 5 is more and more near fingerprint detection region 220, when distance as is between the two less than a certain preset value (as 1 centimetre), just controls fingerprint detection region 220 and start working to carry out fingerprint detection.
According to the fingerprint sensor of the embodiment of the present invention, finger is made between conductor layer and finger, to produce inductance capacitance in time detecting panel by arranging conductor layer, due to finger more proximity test panel, the inductance capacitance formed between conductor layer and finger is larger, therefore, can judge to point the distance between detection panel according to inductance capacitance size variation, and when pointing and detect the distance between panel and being very little, think that finger has the intention of being carried out fingerprint surface sweeping by fingerprint sensor, now, multiple fingerprint detection unit is started working and carries out finger scan, when pointing and detect the distance between panel and being larger, multiple fingerprint detection unit is quit work.Thus, effectively can reduce the working time of multiple fingerprint detection unit, reduce the power consumption of fingerprint detection unit, make fingerprint sensor have low in energy consumption, energy-conservation advantage.
Shown in composition graphs 2-4, in order to improve the fingerprint detection precision of the fingerprint sensor 200 of the embodiment of the present invention, control module, also for when judging that the distance between finger 5 and multiple fingerprint detection unit 221 is less than preset value (as 1 centimetre), controlling conductor layer 230 ground connection (GND) or connecing preset potential.Thus, Isolated Shield effect can be played to fingerprint detection region 220, the interference to fingerprint detection region 220 such as reduction outer signals, thus promote the fingerprint detection precision of fingerprint sensor 200.
Further, in order to make conductor layer 230 pairs of fingerprint detection regions 220 play effective Isolated Shield.Shown in composition graphs 2, in one embodiment of the invention, conductor layer 230 can be arranged around fingerprint detection region 220.
Specifically, one deck conductor layer is distributed with as the conductor layer 230 in one embodiment of the invention around fingerprint detection region 220, when finger 5 is positioned on fingerprint detection region 220, finger 5 and conductor layer 230 form inductance capacitance Cx, by detecting the size of inductance capacitance Cx, judge whether that finger 5 is positioned at above fingerprint detection region 220.
As from the foregoing, conductor layer 230 is centered around fingerprint detection region 220 surrounding, thus when controlling fingerprint detection region 220 and starting working and carry out fingerprint surface sweeping, conductor layer 230 is made to receive (as ground connection or preset potential) on fixing current potential, thus fingerprint detection region 220 is played to the effect of Isolated Shield, reduce as the interference to fingerprint detection region 220 such as outer signals, thus the accuracy of detection of fingerprint sensor 200 can be promoted.
In order to play Isolated Shield to fingerprint detection region 220 better, shown in composition graphs 3, in another embodiment of the invention, conductor layer 230 can comprise the multiple sub-conductor frame 231 in the distribution of many row's multiple rows, and multiple fingerprint detection unit 221 is arranged in multiple sub-conductor frame 231 correspondingly.
In other words, also can think to be distributed with conductor layer 230 around each fingerprint detection unit 221, owing to having distribution around each fingerprint detection unit 221 of conductor layer 230 in whole fingerprint detection region 220, like this, the inductance capacitance Cx of conductive layer 230 finger sensing not only can be made more responsive, can also work as and control fingerprint detection region 220 when starting working and carry out fingerprint surface sweeping, conductor layer 230 receives (as ground connection or preset potential) on fixing current potential, because conductor layer 230 is distributed in each fingerprint detection unit 221 around, therefore, not only can shield the interference of such as outer signal to fingerprint detection region 220, but also the crosstalk that can shield between adjacent fingerprint detection unit 221, so, more promote the fingerprint detection precision of fingerprint sensor 200, and there is the advantage that noise is little.
According to the fingerprint sensor of the embodiment of the present invention, there is low in energy consumption, that fingerprint detection precision is high advantage.
In addition, according to the fingerprint sensor of the embodiment of the present invention other form and effect be all known for a person skilled in the art, in order to reduce redundancy, do not repeat herein.
As shown in Figure 5, further embodiment of the present invention also proposed a kind of control method of fingerprint sensor, and wherein, fingerprint sensor is such as the fingerprint sensor 200 shown in any one embodiment above-mentioned.This control method comprises the steps:
Step S501: detect between conductor layer and finger and produce inductance capacitance.
Step S502: judge the distance between finger and multiple fingerprint detection unit according to the variation tendency of inductance capacitance.
Step S503: when distance is less than preset value, controls multiple fingerprint detection unit and starts working with scanning fingerprint.
Certainly, if judging distance is not less than preset value, then controls multiple fingerprint detection unit and quit work.
According to the control method of the fingerprint sensor of the embodiment of the present invention, judge that whether the distance pointed and detect between panel is less according to the inductance capacitance formed between conductor layer and finger, and when less, make multiple fingerprint detection unit start working carry out finger scan, when pointing and detect the distance between panel and being larger, multiple fingerprint detection unit is quit work.Thus, effectively can reduce the working time of multiple fingerprint detection unit, reduce the power consumption of fingerprint detection unit, make fingerprint sensor have low in energy consumption, energy-conservation advantage.
Further, when judging that the distance between finger and multiple fingerprint detection unit is less than preset value, the method for the embodiment of the present invention also comprises: control conductor layer ground connection or connect preset potential.Like this, the effect of Isolated Shield can be played to fingerprint detection region, reduce as the interference to fingerprint detection region such as outer signals, thus the accuracy of detection of fingerprint sensor can be promoted.
Describe and can be understood in process flow diagram or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this instructions, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random-access memory (ram), ROM (read-only memory) (ROM), erasablely edit ROM (read-only memory) (EPROM or flash memory), fiber device, and portable optic disk ROM (read-only memory) (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanning to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer memory.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and aim, scope of the present utility model is by claim and equivalency thereof.
Claims (8)
1. a fingerprint sensor, is characterized in that, comprising:
Fingerprint detection panel;
Be positioned at the fingerprint detection region on described fingerprint detection panel, be provided with multiple fingerprint detection unit in described fingerprint detection region, described multiple fingerprint detection unit distributes in many row's multiple rows on described fingerprint detection region;
Conductor layer, described conductor layer is arranged on described fingerprint detection panel, with when pointing near described fingerprint detection region, between described conductor layer and described finger, produces inductance capacitance;
Capacitive detection module, for detecting described inductance capacitance;
Control module, described control module is connected with capacitive detection module with described multiple fingerprint detection unit, conductor layer respectively, for judging the distance between described finger and described multiple fingerprint detection unit according to the variation tendency of described inductance capacitance, and when described distance is less than preset value, controls described multiple fingerprint detection unit and start working with scanning fingerprint.
2. fingerprint sensor according to claim 1, is characterized in that, described control module also for when judging that the distance between described finger and described multiple fingerprint detection unit is less than described preset value, controlling described conductor layer ground connection or connecing preset potential.
3. fingerprint sensor according to claim 1, it is characterized in that, described control module, also for when judging that the distance between described finger and described multiple fingerprint detection unit is not less than described preset value, controlling described multiple fingerprint detection unit and quitting work.
4. fingerprint sensor according to claim 1, is characterized in that, described conductor layer is arranged around described fingerprint detection region.
5. fingerprint sensor according to claim 1, is characterized in that, described conductor layer comprises the multiple sub-conductor frame in the distribution of many row's multiple rows, and described multiple fingerprint detection unit is arranged in described multiple sub-conductor frame correspondingly.
6. a control method for the fingerprint sensor as described in any one of claim 1-5, is characterized in that, comprises the following steps:
Detect between conductor layer and finger and produce inductance capacitance;
The distance between described finger and described multiple fingerprint detection unit is judged according to the variation tendency of described inductance capacitance; And
When described distance is less than preset value, controls described multiple fingerprint detection unit and start working with scanning fingerprint.
7. control method according to claim 6, is characterized in that, also comprises:
When judging that the distance between described finger and described multiple fingerprint detection unit is less than described preset value, controlling described conductor layer ground connection or connecing preset potential.
8. control method according to claim 6, is characterized in that, also comprises:
When judging that the distance between described finger and described multiple fingerprint detection unit is not less than described preset value, controlling described multiple fingerprint detection unit and quitting work.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310744446.0A CN104751106B (en) | 2013-12-30 | 2013-12-30 | The control method of fingerprint sensor and fingerprint sensor |
| PCT/CN2014/095423 WO2015101266A1 (en) | 2013-12-30 | 2014-12-29 | Sensor for detecting fingerprint and fingerprint identification apparatus and controlling method of sensor for detecting fingerprint |
| EP14875903.8A EP3090383A4 (en) | 2013-12-30 | 2014-12-29 | Sensor for detecting fingerprint and fingerprint identification apparatus and controlling method of sensor for detecting fingerprint |
| KR1020167020728A KR20160130747A (en) | 2013-12-30 | 2014-12-29 | Sensor for detecting fingerprint and fingerprint identification appratus and controlling method of sensor for detecting fingerprint |
| US15/192,814 US9990529B2 (en) | 2013-12-30 | 2016-06-24 | Sensor for detecting fingerprint and identification apparatus and controlling method of sensor for detecting fingerprint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310744446.0A CN104751106B (en) | 2013-12-30 | 2013-12-30 | The control method of fingerprint sensor and fingerprint sensor |
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| CN104751106A true CN104751106A (en) | 2015-07-01 |
| CN104751106B CN104751106B (en) | 2019-09-13 |
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| CN201310744446.0A Active CN104751106B (en) | 2013-12-30 | 2013-12-30 | The control method of fingerprint sensor and fingerprint sensor |
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| CN106570442A (en) * | 2015-10-09 | 2017-04-19 | 小米科技有限责任公司 | Fingerprint identification method and device |
| CN106980832A (en) * | 2017-03-22 | 2017-07-25 | 上海创功通讯技术有限公司 | fingerprint identification method and device |
| CN107390854A (en) * | 2017-06-29 | 2017-11-24 | 维沃移动通信有限公司 | A kind of fingerprint detection open method and electronic equipment |
| CN108288036A (en) * | 2018-01-13 | 2018-07-17 | 蚌埠华特科技有限公司 | A kind of production method of the fingerprint module based on glass substrate |
| CN109376685A (en) * | 2018-11-13 | 2019-02-22 | 武汉华星光电半导体显示技术有限公司 | The manufacturing method of fingerprint identification device, fingerprint identification method and fingerprint identification device |
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| CN107390854A (en) * | 2017-06-29 | 2017-11-24 | 维沃移动通信有限公司 | A kind of fingerprint detection open method and electronic equipment |
| CN108288036A (en) * | 2018-01-13 | 2018-07-17 | 蚌埠华特科技有限公司 | A kind of production method of the fingerprint module based on glass substrate |
| CN116861392A (en) * | 2018-03-26 | 2023-10-10 | 华为技术有限公司 | Fingerprint unlocking method and terminal |
| CN110832482A (en) * | 2018-03-26 | 2020-02-21 | 华为技术有限公司 | Fingerprint unlocking method and terminal |
| US11941101B2 (en) | 2018-03-26 | 2024-03-26 | Huawei Technologies Co., Ltd. | Fingerprint unlocking method and terminal |
| US11630892B2 (en) | 2018-03-26 | 2023-04-18 | Huawei Technologies Co., Ltd. | Fingerprint unlocking method and terminal |
| WO2020073166A1 (en) * | 2018-10-08 | 2020-04-16 | 深圳市汇顶科技股份有限公司 | Fingerprint recognition method and apparatus, and terminal device |
| CN109376685A (en) * | 2018-11-13 | 2019-02-22 | 武汉华星光电半导体显示技术有限公司 | The manufacturing method of fingerprint identification device, fingerprint identification method and fingerprint identification device |
| CN110287922A (en) * | 2019-06-29 | 2019-09-27 | Oppo广东移动通信有限公司 | Fingerprint identification method and Related product |
| CN110287922B (en) * | 2019-06-29 | 2021-05-07 | Oppo广东移动通信有限公司 | Fingerprint identification method and related product |
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