CN106295487A - The fingerprint detection method of capacitance type fingerprint sensor - Google Patents
The fingerprint detection method of capacitance type fingerprint sensor Download PDFInfo
- Publication number
- CN106295487A CN106295487A CN201510357658.2A CN201510357658A CN106295487A CN 106295487 A CN106295487 A CN 106295487A CN 201510357658 A CN201510357658 A CN 201510357658A CN 106295487 A CN106295487 A CN 106295487A
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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
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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
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- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
A kind of fingerprint detection method of capacitance type fingerprint sensor, for arranging multiple first sensing unit in the one of this capacitance type fingerprint sensor big sensing region, in being positioned at the multiple little sensing region among this big sensing region, multiple quantity the second sensing unit less than this first sensing unit is set, and make this second sensing unit have an enabled status the most alternately and a closed mode, only detecing side in this enabled status has an object to exceed a set threshold value after a produced sensing value is cumulative, this the first sensing unit of this capacitance type fingerprint sensor just enable and this second sensing unit are to carry out a finger scan operation, make this capacitance type fingerprint sensor can reach the energy-conservation and effect of automatically starting.
Description
Technical field
The present invention relates to a kind of capacitance type fingerprint sensor, particularly relate to one and make this capacitance type fingerprint sensor
The fingerprint detection method of power saving.
Background technology
By biological characteristic exclusive for individual, such as fingerprint, vocal print, iris, in order to become confirmation individual
The mode of identity, gradually popularizes along with the development of science and technology, especially with the technology of identification of fingerprint,
Use the most widely and need on the electronic installation of personal identification.
Such as in TaiWan, China patent discloses No. 200713084, i.e. disclose a kind of insert finger-print-enciphering
Mobile phone, this insert finger-print-enciphering mobile phone includes a fingerprint acquisition unit, a parallel port and a comparing unit.
This fingerprint acquisition unit is for putting a finger for a user, to capture a simulation fingerprint image of this finger,
And export after this simulation fingerprint image is converted to a digital fingerprint image.This parallel port is for receiving and temporary
This digital fingerprint image, and export a fingerprint comparison signal.This comparing unit is this fingerprint comparison signal of reception,
And read this digital fingerprint image to this parallel port, and with a minutiae matching algorithm to this digital finger-print
Image and a built-in fingerprint image compare, according to and export a comparison result, then by this comparison result determine should
Whether user can use this mobile phone, to increase the safety of mobile phone and its internal data.
But, for a portable electronic installation, it is limited on this electronic device design for convenience
Carrying, the finite volume allowed so that the battery that this electronic installation is installed, its capacity typically cannot be too
Greatly, this electronic installation is haggled over every penny for the electric power consumed needed for all parts, therefore, how to save set
The running electric power of the finger scan element put, and have the convenience in use concurrently, it has also become each dealer institute
The target made great efforts.
Summary of the invention
The main object of the present invention, is to solve existing finger scan element, if normality open detection, tool
There is the problem that power consumption is big, if setting up a unlatching switch, then need to additionally start this unlatching switch when having use,
Problem the most easily.
For reaching above-mentioned purpose, the present invention provides the fingerprint detection method of a kind of capacitance type fingerprint sensor, application
In a capacitance type fingerprint sensor, this capacitance type fingerprint sensor includes a capacitance sensing array, this electric capacity
Sensing array comprises the second sense less than this first sensing unit of multiple first sensing unit and multiple quantity
Surveying unit, this fingerprint detection method comprises the steps of
Step 1: this capacitance type fingerprint sensor makes this second sensing unit have an enable the most alternately
State and a closed mode, this second sensing unit starts one near detection pattern in this enabled status, in
This closed mode starts a park mode;
Step 2: this capacitance type fingerprint sensor makes this second sensing unit enter this enabled status and startup should
Near detection pattern, this second sensing unit produces a sensing near detection pattern to a close object in this
Value;
Step 3: this capacitance type fingerprint sensor adds up this second sensing unit and performs this in this enabled status and lean on
This sensing value that nearly detection pattern this object detected is close and produces;And
Step 4: this capacitance type fingerprint sensor judges whether this sensing value in this enabled status is accumulative arrives
One threshold value;
Wherein, in judging that this accumulative sensing value arrives this threshold value, this capacitance type fingerprint sensor make this
One sensing unit and this second sensing unit starting one fingerprint detection pattern, to carry out a fingerprint scan operation;
Wherein, in judging that this accumulative sensing value is not up to this threshold value, this capacitance type fingerprint sensor is the most clear
Except this sensing value and make this second sensing unit enter this closed mode and start this park mode.
Consequently, it is possible to the present invention is in this capacitance type fingerprint sensor, make this second sensing unit tool of minority
There are this enabled status the most alternately and this closed mode, reduce this capacitance type fingerprint sensor in not entering
Power consumption during row finger scan, and arrive this door in detecting this object near this sensing value added up
Threshold value, moreover it is possible to automatically perform this fingerprint scan operation, is not only not required to extra activate switch, easy to use,
More can avoid the most non-carrying out the of short duration close of finger scan, the feelings of this fingerprint scan operation of error starting
Shape.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as to the present invention's
Limit.
Accompanying drawing explanation
Fig. 1, for the steps flow chart schematic diagram of one embodiment of the invention;
Fig. 2, for the square frame configuration schematic diagram of one embodiment of the invention.
Detailed description of the invention
Relating to detailed description of the invention and technology contents, existing just cooperation accompanying drawing is described as follows:
Please arrange in pairs or groups refering to shown in Fig. 1 and Fig. 2, Fig. 1 is the steps flow chart schematic diagram of one embodiment of the invention,
Fig. 2 is the square frame configuration schematic diagram of one embodiment of the invention, as it can be seen, the present invention refers to for a kind of condenser type
The fingerprint detection method of stricture of vagina sensor, is applied to a capacitance type fingerprint sensor, this capacitance type fingerprint sensor
It is mountable to various needs by fingerprint recognition to carry out the electronic installation of authentication, the most common mobile electricity
Sub-device, such as smart mobile phone, panel computer, notebook computer etc..This capacitance type fingerprint sensor includes
The one big sensing region 11 of capacitance sensing array 10, one and multiple be scattered among this big sensing region 11
Little sensing region 12, this capacitance sensing array 10 comprises multiple first sensing unit 111 and multiple the
Two sensing unit 121, this first sensing unit 111 is arranged at this big sensing region 11 and arranges in array,
The quantity of this second sensing unit 121 is less than this first sensing unit 111, and is arranged at this little sensing region
12 and in array arrange, in the present embodiment, at least one this little sensing region 12 can be located at this big sensing
The middle position in region 11, this fingerprint detection method comprises the steps of
Step 1: this capacitance type fingerprint sensor makes this second sensing unit 121 have the most alternately
Enabled status and a closed mode, this second sensing unit 121 starts one near detection in this enabled status
Pattern, starts a park mode in this closed mode.In the present embodiment, this second sensing unit 121
In once this enabled status, between lasting 40ms to 60ms, and can start this near detection pattern with
Detect whether that an object is close, and in once this closed mode, between lasting 150ms to 250ms,
And this park mode can be started to decommission, the above-mentioned persistent period is only for example, and is not limited system, holds
The continuous time can be arranged according to actually used demand, is mainly less than this resting state with the persistent period of this enabled status
Persistent period.
Step 2: this capacitance type fingerprint sensor makes this second sensing unit 121 enter this enabled status and open
Dynamic this near detection pattern, this close object is produced near detection pattern by this second sensing unit 121 in this
A raw sensing value.In this near detection pattern, it is positioned at this second sensing unit 121 of this little sensing region 12
This sensing value corresponding near generation to this object, this sensing value can be such as the changing value of an electric capacity.And
This second sensing unit 121 is arranged at this little sensing region 12 of this big sensing region 11 middle position,
Then contribute to this near detection pattern time, improve to this this capacitance sensing array 10 of object proximity time, inspection
The accuracy surveyed.
Step 3: this capacitance type fingerprint sensor adds up this second sensing unit 121 and performs in this enabled status
This sensing value that this is close near this object detected by detection pattern and produces.In the present embodiment, this electricity
Appearance formula fingerprint sensing device further includes accumulator 40, multiplexer 20 and an analog-digital converter 30,
This accumulator 40 with this second sensing unit 121 be electrically connected with, this multiplexer 20 be electrically connected at this second
Between sensing unit 121 and this multiplexer 20, this analog-digital converter 30 is then electrically connected at this multiplexing
Between device 20 and this accumulator 40.At this among detection pattern, due to this object near for often
For this second sensing unit 121 individual, this sensing value that can be generated by compared to general contact detection is faint
, therefore must be electrically connected with this second sensing unit 121 each by this multiplexer 20, sequentially select
Receive this second sensing unit 121 this sensing value produced each, then by this analog-digital converter
This sensing value is converted into a digital forms from a simulation pattern by 30, and is added up by this accumulator 40,
To obtain one for the total value judging the close foundation of this object.
Step 4: this capacitance type fingerprint sensor judges whether this sensing value in this enabled status is accumulative arrives
One threshold value.Step 3 is added up this total value obtained by this sensing value by this capacitance type fingerprint sensor, with
A set threshold value compares, in order to judge whether this close object is a fingerprint scan to be carried out
Finger, this threshold value refers to an actual finger and is set near required numerical value.
In the case of this total value arrives this threshold value, this capacitance type fingerprint sensor judges this accumulative sense
Measured value arrives this threshold value, represents that this object may be a finger, and the just enable of this capacitance type fingerprint sensor should
First sensing unit 111, and make this first sensing unit 111 all start one with this second sensing unit 121
Fingerprint detection pattern, and carried out a fingerprint scan operation.
And in the case of this total value does not arrives this threshold value, this capacitance type fingerprint sensor i.e. judges to add up
This sensing value be not up to this threshold value, this represents that the distance of this object and this capacitance type fingerprint sensor is inadequate
Closely, or this object fell short of near the time of this capacitance type fingerprint sensor, assert that this object should accordingly
Not being intended to carry out this finger of this fingerprint scan operation, this capacitance type fingerprint sensor then removes this sensing value,
And make this second sensing unit 121 enter this closed mode starting this park mode, and still not enable this first
Sensing unit 111, to save the consumption of electric power.
It addition, still it should be noted that, in the present invention, after step 4, step 5 can also be comprised.
Step 5: after terminating this finger scan operation or this closed mode, then return to step 2.So,
When this first sensing unit 111 and this second sensing unit 121 perform after this stricture of vagina scanning operation terminates, this electricity
Appearance formula fingerprint sensing device makes this first sensing unit 111 return to the state of non-enable, this second sensing unit
121 enter back into this enabled status, restart this and perform detection near detection pattern, and return to step 2.
And when this second sensing unit 121 performs after this park mode terminates, this capacitance type fingerprint sensor make this
Two sensing unit 121 enter back into this enabled status, restart this and perform detection near detection pattern, and return to
Step 2, so, if there not being this object reaching this threshold value close yet, this second sensing unit 121 depends on
According to step 2 to step 4, it will periodically circulate with this closed mode in this enabled status, this first sense
Survey unit 111 then will not enable, to save electric power.
In sum, owing to the present invention is in this capacitance type fingerprint sensor, this second sense that only order is minority
Survey unit and there is this enabled status periodically alternately and this closed mode, and the continuing of this enabled status
Time is also smaller than the persistent period of this resting state, this capacitance type fingerprint sensor is greatly decreased in not carrying out
Power consumption during finger scan.Furthermore, once in detecting this object near this sensing value arrival added up
This threshold value, can perform this fingerprint scan work with this second sensing unit by this first sensing unit of enable automatically
Industry, is not only not required to extra activate switch, easy to use, is more avoided that the non-object carrying out finger scan is short
Temporary close or and distance this fingerprint scan of shorter caused error starting work of this capacitance type fingerprint sensor
The problem of industry, has power saving and advantage easy to use concurrently.
Certainly, the present invention also can have other various embodiments, without departing substantially from present invention spirit and the feelings of essence thereof
Under condition, those of ordinary skill in the art work as can make various corresponding change and deformation according to the present invention, but
These change accordingly and deform the protection domain that all should belong to appended claims of the invention.
Claims (10)
1. a fingerprint detection method for capacitance type fingerprint sensor, is applied to a capacitance type fingerprint sensor,
This capacitance type fingerprint sensor includes a capacitance sensing array, and this capacitance sensing array comprises multiple first sense
Survey unit and multiple quantity the second sensing unit less than this first sensing unit, it is characterised in that this refers to
Marks detection method comprises the steps of
Step 1: this capacitance type fingerprint sensor makes this second sensing unit have an enable the most alternately
State and a closed mode, this second sensing unit starts one near detection pattern in this enabled status, in
This closed mode starts a park mode;
Step 2: this capacitance type fingerprint sensor makes this second sensing unit enter this enabled status and startup should
Near detection pattern, this second sensing unit produces a sensing near detection pattern to a close object in this
Value;
Step 3: this capacitance type fingerprint sensor adds up this second sensing unit and performs this in this enabled status and lean on
This sensing value that nearly detection pattern this object detected is close and produces;And
Step 4: this capacitance type fingerprint sensor judges whether this sensing value in this enabled status is accumulative arrives
One threshold value;
Wherein, in judging that this accumulative sensing value arrives this threshold value, this capacitance type fingerprint sensor make this
One sensing unit and this second sensing unit starting one fingerprint detection pattern, to carry out a fingerprint scan operation;
Wherein, in judging that this accumulative sensing value is not up to this threshold value, this capacitance type fingerprint sensor is the most clear
Except this sensing value and make this second sensing unit enter this closed mode and start this park mode.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 1, its feature exists
In, in step 1, this enabled status continues between 40ms to 60ms.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 1, its feature exists
In, in step 1, this closedown shape continues between 150ms to 250ms.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 1, its feature exists
In, in step 1, this second sensing unit decommissions in this park mode.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 1, its feature exists
One is comprised for arranging the big sensing region of this first sensing unit and multiple in, this capacitance type fingerprint sensor
It is scattered in the little sensing region of this big sensing region, at least one this little sense for arranging this second sensing unit
Survey region and be positioned at the central authorities of this big sensing region.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 1, its feature exists
In, in step 3, it is tired with what this second sensing unit was electrically connected with that this capacitance type fingerprint sensor further includes one
Adding device, this capacitance type fingerprint sensor utilizes this accumulator to add up this sensing value.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 6, its feature exists
Add up this sensing value of each this second sensing unit in, this accumulator.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 6, its feature exists
In, in step 3, this capacitance type fingerprint sensor further includes one and is electrically connected at this second sensing unit and is somebody's turn to do
The simulation numeral that multiplexer and between accumulator is electrically connected between this multiplexer and this accumulator
Transducer, this multiplexer receives this sensing value of this second sensing unit, and is sent to this Analog-digital Converter
Device is changed, then is added up this sensing value by this accumulator.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 1, its feature exists
In, further include step 5, after terminating this finger scan operation or this closed mode, then return to step 2.
The fingerprint detection method of capacitance type fingerprint sensor the most according to claim 1, its feature exists
In, this sensing value is the changing value of an electric capacity.
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Cited By (8)
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CN107832706A (en) * | 2017-11-09 | 2018-03-23 | 深圳市晓控通信科技有限公司 | A kind of identification with functions/drying accurately capacitance type fingerprint identification equipment |
CN108399671A (en) * | 2018-03-06 | 2018-08-14 | 江苏盛世华安智能科技股份有限公司 | A kind of Internet of Things vena metacarpea video gate inhibition integrated system |
CN108694366A (en) * | 2017-04-05 | 2018-10-23 | 映智科技股份有限公司 | Fingerprint sensor and method for reducing noise interference |
CN109389003A (en) * | 2017-08-02 | 2019-02-26 | 旭景科技有限公司 | Condenser type image sensor and its operating method |
WO2019056399A1 (en) * | 2017-09-20 | 2019-03-28 | 友达光电股份有限公司 | Sensing apparatus and control method |
CN110491005A (en) * | 2019-08-16 | 2019-11-22 | 深圳市汇顶科技股份有限公司 | Fingerprint gate lock awakening method, device, MCU, fingerprint gate lock and storage medium |
CN110826479A (en) * | 2018-12-27 | 2020-02-21 | 神盾股份有限公司 | Electronic device and under-screen fingerprint sensing method thereof |
CN111125661A (en) * | 2018-11-01 | 2020-05-08 | 广达电脑股份有限公司 | Electronic device and security method thereof |
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CN110491005A (en) * | 2019-08-16 | 2019-11-22 | 深圳市汇顶科技股份有限公司 | Fingerprint gate lock awakening method, device, MCU, fingerprint gate lock and storage medium |
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Application publication date: 20170104 |