CN109496315A - Fingerprint detection stamp device, fingerprint detection system and electronic equipment - Google Patents
Fingerprint detection stamp device, fingerprint detection system and electronic equipment Download PDFInfo
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- CN109496315A CN109496315A CN201880002331.5A CN201880002331A CN109496315A CN 109496315 A CN109496315 A CN 109496315A CN 201880002331 A CN201880002331 A CN 201880002331A CN 109496315 A CN109496315 A CN 109496315A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/94—Hardware or software architectures specially adapted for image or video understanding
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/719—Interference-related aspects
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
This disclosure relates to fingerprinting detection technique field, a kind of fingerprint detection stamp device, fingerprint detection system and electronic equipment are disclosed.Fingerprint detection stamp device includes: fingerprint detection chip, the fingerprint detection chip includes stamp signal generator module and edge time adjustment module, the stamp signal generator module is to generate the random stamp signal of spread spectrum, the edge time adjustment module is adjusted to the edge time to the random stamp signal of spread spectrum, obtains dynamic edge stamp signal.Stamp signal can be effectively reduced to the EMI of mobile device radio communication using random stamp signal driving fingerprint detection chip is spread, above-mentioned interference can be further decreased using the edge time that edge time adjustment module increases the random stamp signal of spread spectrum.
Description
Technical field
This disclosure relates to fingerprinting detection technique field, in particular to a kind of fingerprint detection stamp device, fingerprint detection system
And electronic equipment.
Background technique
Fingerprint can be used to carry out a body as the distinctive biological characteristic of the mankind, unique and uniqueness
Part identification.The function of fingerprint detection is generally realized by fingerprint detection chip, and fingerprint detection chip just has to work
It is driven by stamp signal.Current finger print detection chip mostly uses fixed sequence program stamp signal to drive fingerprint detection core
Piece, however the electromagnetic interference (Electromagnetic that fixed sequence program stamp signal is generated in full frequency band
Interference, EMI) it is bigger, thus it is easier the radio communication of interference mobile device.
Summary of the invention
For the problems in background technique, the disclosure is designed to provide a kind of fingerprint detection stamp device, effectively drops
Stamp signal is to the EMI of mobile device radio communication when low fingerprint detection, while can realize height using low-voltage driving chip
Press the effect of stamp；Another object of the present disclosure is to provide a kind of fingerprint detection system；Another purpose of the disclosure exists
In offer a kind of electronic equipment.
One embodiment of the disclosure provides a kind of fingerprint detection stamp device, comprising: fingerprint detection chip, the finger
Line detection chip includes stamp signal generator module and edge time adjustment module；The stamp signal generator module is to generate
Random stamp signal is spread, the edge time adjustment module is carried out to the edge time to the random stamp signal of spread spectrum
Adjustment, obtains dynamic edge stamp signal.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the stamp signal generates mould
Block includes random signal generation module, and the random signal generation module is to generate irregular random signal.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the stamp signal generates mould
Block further includes amplitude quantization module, and the amplitude quantization module obtains number to carry out digital quantization to the random signal
Quantized signal.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the stamp signal generates mould
Block further includes pulse-width adjustment module, and the pulse-width adjustment module is obtained to carry out pulse-width adjustment to the digital quantization signal
Pulse-width adjustment signal.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the stamp signal generates mould
Block further includes spreading random stamp module, and the random stamp module of spread spectrum is to carry out spread spectrum behaviour to the pulse-width adjustment signal
Make, obtains the random stamp signal of spread spectrum.The random stamp signal of the spread spectrum include in one cycle standard high level and
Standard low level, the standard high level and the standard low level respectively have the level of specific time length, and institute
It states standard high level and the low level number of the standard is fixed, the standard high level and the standard low level respectively
It is random distribution in one cycle, the standard high level and the low level total time length of the standard are exactly a week
Phase length.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the edge time adjusts mould
Block includes edge time adjustment circuit, the first current branch and the second current branch, first current branch or described second
Current branch connects the edge time adjustment circuit, and providing charging current, and second current branch provides
Charging current is greater than the charging current that first current branch provides.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the edge time adjusts mould
Block further includes switching switch, switching switch to switch the edge time adjustment circuit and first current branch or
With the on-off between second current branch, further the spread spectrum of control into edge time adjustment module is random
The edge time of stamp signal.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the random stamp letter of spread spectrum
After number entering edge time adjustment module, edge time adjustment circuit described in the switching switching and described first electric
The on-off between branch is flowed, to increase the edge time of the random stamp signal of spread spectrum；Described in the switching switching
On-off between edge time adjustment circuit and second current branch, to make the edge of the random stamp signal of spread spectrum
It is rapidly achieved predetermined level, the predetermined level is the high level or low level of the random stamp signal of spread spectrum.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the fingerprint detection chip is also
Including master chip circuit, the master chip circuit realizes the fingerprint detection chip to receive the power supply signal of extraneous offer
Normal communication and work.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the fingerprint detection stamp dress
Setting further includes booster circuit, and the dynamic edge stamp signal of the edge time adjustment module output is as the booster circuit
Input signal, the booster circuit the dynamic edge stamp signal is converted to two groups of high pressure stamp signals with frequency,
Respectively chip power signal and chip earth signal, and the amplitude of the chip power signal and the chip earth signal every bit
Difference keep constant.The chip power signal and the chip earth signal provide power supply for the master chip circuit to guarantee
State the normal communication and work of fingerprint detection chip.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the booster circuit includes beating
Code signal receiving end, a plurality of boosting branch and a plurality of voltage converting branch.
The stamp signal receiving end is to receive the dynamic edge stamp signal；
The a plurality of boosting branch repeatedly to be boosted the voltage magnitude of the dynamic edge stamp signal respectively
Processing, to form two groups of high pressure stamp signals with frequency, and respectively as the chip power signal and the chip earth signal；
Boosting processing status of a plurality of voltage converting branch to open a plurality of boosting branch, a plurality of electricity
When pressure converting branch is respectively turned on a plurality of boosting branch simultaneously, the voltage magnitude of the dynamic edge stamp signal will be mentioned
It rises.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the booster circuit further includes
High voltage power supply output end and high-voltage signal ground output end.The high voltage power supply output end and the high-voltage signal ground output end difference
To export the chip power signal and the chip earth signal.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the fingerprint detection chip is also
Including chip power receiving end and chip ground terminal, the chip power receiving end and the chip ground terminal are described to receive respectively
Chip power signal and the chip earth signal.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, a plurality of voltage conversion branch
Road includes first voltage converting branch, second voltage converting branch and tertiary voltage converting branch.
The first voltage converting branch includes power supply receiving end and first switch, the power supply receiving end and described the
One switch is directly connected to.The power supply receiving end is to receive the analog power of extraneous offer, to supply for the booster circuit
Electricity.
The second voltage converting branch includes the power supply receiving end, first diode and second switch, the electricity
Source receiving end connects the anode of the first diode, and the cathode of the first diode connects the second switch.
The tertiary voltage converting branch includes the power supply receiving end, the second diode and third switch, the electricity
Source receiving end connects the anode of second diode, and the cathode of second diode connects one end of the third switch,
The other end of third switch with connecting high-voltage signal output end.
The 4th voltage converting branch includes the power supply receiving end and third diode, and the power supply receiving end connects
The anode of the third diode is connect, the cathode of the third diode connects the high voltage power supply output end.
The first switch, the second switch and third switch are first group of switch.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, a plurality of boosting branch packet
Include the first boosting branch, the second boosting branch and third boosting branch.
The first boosting branch includes first capacitor and the 4th switch.The cathode of the first capacitor passes through described the
Four switch ground connection include the first boost node, the first voltage between the cathode of the first capacitor and the 4th switch
Converting branch is connect by the first switch with first boost node；The second boosting of anode connection of the first capacitor
Node, second boost node connect the second voltage converting branch, and be connected to the cathode of the first diode with
Between the second switch.
The second boosting branch includes the second capacitor and the 5th switch.The cathode of second capacitor passes through described the
Five switch ground connection include third boost node, the second voltage between the cathode of second capacitor and the 5th switch
Converting branch is connect by the second switch with the third boost node；The 4th boosting of anode connection of second capacitor
Node, the 4th boost node connect the tertiary voltage converting branch, and be connected to the cathode of second diode with
Between the third switch.
The third boosting branch includes third capacitor and the 6th switch.The cathode of the third capacitor passes through described the
Six switch ground connection include the 5th boost node, the tertiary voltage between the cathode of the third capacitor and the 6th switch
Converting branch is switched by the third and is connect with the 5th boost node, and the 5th boost node is located at the third
Switch and the high-voltage signal between output end；Anode the 6th boost node of connection of the third capacitor, the 4th electricity
Pressure converting branch is connect by the cathode of the third diode with the 6th boost node, and the 6th boost node position
Between the third diode and the high voltage power supply output end.
4th switch, the 5th switch and the 6th switch are second group of switch.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the input of the booster circuit
Signal further includes the reverse signal of the dynamic edge stamp signal, and the dynamic edge stamp signal controls described first group and opens
It closes, the reverse signal controls second group of switch.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, the reverse signal is by described
Dynamic edge stamp signal is obtained by phase inverter.
As a kind of optional implementation for the fingerprint detection stamp device that the disclosure provides, first group of switch and institute
Stating second group of switch is all that high level is effective, when the high level of the dynamic edge stamp signal arrives, first group of switch
Closure and second group of switch disconnection；When the high level of the reverse signal arrives, first group of switch is disconnected and described
Second group closes the switch.
One embodiment of the disclosure provides a kind of fingerprint detection system, including fingerprint detection stamp as described above dress
It sets.
As a kind of optional implementation for the fingerprint detection system that the disclosure provides, the fingerprint detection system further includes
Host computer control module, the host computer control module is to provide analog power to the booster circuit.
As a kind of optional implementation for the fingerprint detection system that the disclosure provides, the fingerprint detection system further includes
Level switch module, the level switch module is to convert between the host computer control module and the fingerprint detection chip
Level makes the electrical level match between the host computer control module and the fingerprint detection chip.
One embodiment of the disclosure provides a kind of electronic equipment, including display screen and below the display screen
Fingerprint detection stamp device, the fingerprint detection stamp device include fingerprint detection stamp device as described above.
The fingerprint detection stamp device that the disclosure has the advantages that the embodiment of the present disclosure provides includes fingerprint detection
Chip, the fingerprint detection chip include stamp signal generator module and edge time adjustment module, and the stamp signal generates
Module is to generate the random stamp signal of spread spectrum, and the edge time adjustment module is to the random stamp signal of spread spectrum
Edge time is adjusted, and obtains dynamic edge stamp signal.It can using random stamp signal driving fingerprint detection chip is spread
Stamp signal is effectively reduced to the EMI of mobile device radio communication, spread spectrum is increased using edge time adjustment module and is beaten at random
The edge time of code signal can further decrease above-mentioned interference, while the fingerprint stamp detection device further includes booster circuit,
So that can realize the effect of high pressure stamp using low-voltage driving chip.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the structural schematic diagram according to the fingerprint detection system of one embodiment of the disclosure；
Fig. 2 be according to Fig. 1 in embodiment stamp signal generator module structural schematic diagram；
Fig. 3 be according to Fig. 1 in embodiment the wave of the random stamp signal of spread spectrum that generates of stamp signal generator module
Shape structural schematic diagram；
Fig. 4 be according to Fig. 1 in embodiment edge time adjustment module structural schematic diagram；
Fig. 5 be according to Fig. 1 in embodiment booster circuit structural schematic diagram；
Fig. 6 is the random stamp signal of spread spectrum and fixed sequence program stamp signal according to one embodiment of the disclosure in full range
The simulation curve schematic diagram for the EMI value that section generates；
Fig. 7 is the structural schematic diagram according to the fingerprint detection stamp device of one embodiment of the disclosure；
Fig. 8 is the structural schematic diagram according to the electronic equipment of one embodiment of the disclosure.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with attached drawing to the disclosure
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the disclosure
In, many technical details are proposed in order to make reader more fully understand the disclosure.But even if without these technical details and
Based on the various changes and modifications of following embodiment, disclosure technical solution claimed also may be implemented.
Fig. 1 is the structural schematic diagram according to the fingerprint detection system of one embodiment of the disclosure.The fingerprint detection system
System 5 includes: fingerprint detection chip 1, booster circuit 2, host computer control module 3 and level switch module 4.
The fingerprint detection chip 1 includes: chip power receiving end 11a, chip ground terminal 11b, master chip circuit 12, stamp
Signal generator module 13 and edge time adjust module 14.
The master chip circuit 12 receives the external world by the chip power receiving end 11a and chip ground terminal 11b and mentions
The power supply signal of confession realizes the normal communication and work of the fingerprint detection chip 1.
The stamp signal generator module 13 is to generate the random stamp signal TX of spread spectrum；The random stamp signal of spread spectrum
TX includes standard high level and standard low level in one cycle, and the standard high level and the standard low level are respectively
Level with specific time length, and the standard high level and the low level number of the standard be respectively it is fixed,
The standard high level and the standard low level are random distribution in one cycle, the standard high level and the mark
Quasi- low level total time length is exactly a cycle length.
The edge time adjustment module 14 is adjusted to the edge time to the random stamp signal TX of spread spectrum,
Obtain dynamic edge stamp signal TXd.
The booster circuit 2 includes: stamp signal receiving end 25, power supply receiving end 28, high voltage power supply output end 29a and height
Press signal ground output end 29b.
After the booster circuit 2 receives the dynamic edge stamp signal TXd by the stamp signal receiving end 25,
The dynamic edge stamp signal TXd is converted into two groups of high pressure stamp signals with frequency, respectively chip power signal SVCC
With chip earth signal SGND, and the amplitude of the chip power signal SVCC and the chip earth signal SGND every bit difference protect
It holds constant.
The power supply receiving end 28 provides electricity to receive the analog power AVDD of extraneous offer for the booster circuit 2
Source guarantees that the booster circuit 2 works normally.
The high voltage power supply output end 29a and the high-voltage signal output end 29b respectively with the fingerprint detection chip 1
Chip power receiving end 11a be connected with chip ground terminal 11b.The chip power signal SVCC and the chip earth signal
By the high voltage power supply output end 29a and the high-voltage signal output end 29b is output to the chip power to SGND respectively
It is that the master chip circuit 12 provides power supply to guarantee the fingerprint detection chip 1 after the receiving end 11a and chip ground terminal 11b
Normal communication and work.
The host computer control module 3 includes power output end 31, is the boosting to export the analog power AVDD
Circuit 2 provides power supply to guarantee the normal work of the booster circuit 2.The host computer control module 3 can have for mobile phone etc.
The main control module or other function module of the mobile device of functions such as power supply and control are provided.
4 pieces of the level conversion mould to convert the electricity between the host computer control module 3 and the fingerprint detection chip 1
It is flat, make the electrical level match between the host computer control module 3 and the fingerprint detection chip 1.
Fig. 2 be according to Fig. 1 in embodiment stamp signal generator module structural schematic diagram.As shown in Fig. 2, stamp
Signal generator module 13 includes: random signal generation module 131, amplitude quantization module 132, pulse-width adjustment module 133 and spread spectrum
Random stamp module 134.
The random signal generation module 131 is to generate irregular random signal 135.The random signal generates mould
Block 131 includes randomizer, optionally, the randomizer can for thermal noise randomizer or quantum with
Machine number generator etc., as long as can produce the random signal 135.
The amplitude quantization module 132 obtains digital quantization signal 136 to quantify to the random signal 135.
Since the amplitude of the random signal 135 of the random signal module 131 generation is random, it is therefore desirable to by its amplitude amount of progress
Change.Specific quantization method can face to choose one between the minimum value and maximum value of the amplitude of the random signal 135
Dividing value, the random signal 135 are more than or equal to the point of the critical value, are quantified as high level, the random signal 135 is small
In the point of the critical value, it is quantified as low level.Finally, the random signal 135 is converted into the digital quantization letter
Numbers 136.
The pulse-width adjustment module 133 is to carry out pulse-width adjustment to the digital quantization signal 136, by the digital quantity
The interval changed between the high level of signal 136 is adjusted to identical time interval, obtains pulse-width adjustment signal 137.
The random stamp module 134 of spread spectrum is spread to carry out spread spectrum operation to the pulse-width adjustment signal 137
Random stamp signal 138.The random stamp signal 138 of spread spectrum includes standard high level and the low electricity of standard in one cycle
Flat, the standard high level and the standard low level are respectively the level with specific time length, and the standard is high
Level and the low level number of the standard be respectively it is fixed, the standard high level and the standard low level are in a week
It is random distribution in phase, the standard high level and the low level total time length of the standard are exactly a cycle length.
The random stamp signal 138 of spread spectrum is that the spread spectrum for being supplied to the edge time adjustment module 14 as shown in Figure 1 is random
Stamp signal TX.
The specific embodiment of the random stamp signal 138 of spread spectrum is referred to Fig. 3.
Fig. 3 be according to Fig. 1 in embodiment the wave of the random stamp signal of spread spectrum that generates of stamp signal generator module
Shape structural schematic diagram.Fig. 3 shows the random stamp signal 138 of spread spectrum in three periods, each period includes that 4 standards are low
Level 1380 and 3 standard high level 1381, but the standard low level 1380 and the standard high level 1381 are in each week
It is random distribution in phase.The standard low level 1380 and the time span of the standard high level 1381 can it is equal can also
With difference, as long as guaranteeing the random stamp signal 138 of the spread spectrum in each period time span having the same.Optionally, originally
Standard low level described in embodiment 1380 is equal with the time span of the standard high level 1381.The standard low level
1380 and the standard high level 1381 be respectively intended to represent binary " 0 " and " 1 ", according to this rule, it is described shown in Fig. 3
{ 1010100,1100010,0111000 ... ... } can be from left to right represented sequentially as by spreading random stamp signal 138.Although
Code value " 1 " is different with the sequence of " 0 " in each period, but each period includes three " 1 " and four " 0 ", that is, such as
The random stamp module 134 of spread spectrum shown in Fig. 2 has carried out spread spectrum operation to the pulse-width adjustment signal 137, has obtained institute
State the random stamp signal 138 of spread spectrum.
Fig. 4 be according to Fig. 1 in embodiment edge time adjustment module structural schematic diagram.Edge time adjusts mould
Block 14 includes: signal input part 141, edge time adjustment circuit 142, switching switch 143, the first current branch 144a, second
Current branch 144b and signal output end 145.
First current branch 144a or described, the second current branch 144b connects the edge time adjustment circuit 142
To provide charging current, and the charging current that the second current branch 144b is provided is greater than first current branch
The charging current that 144a is provided.
The random stamp signal 138 of spread spectrum that the stamp signal generator module 13 generates from the signal input part 141 into
After entering edge time adjustment module 14, the switching switch 143 connects the edge time adjustment circuit 142 and the first
One current branch 144a provides charging current, when edge to the rising edge for increasing the random stamp signal 138 of spread spectrum
Between.After the predetermined charging time, the switching switch 143 connects the edge time adjustment circuit 142 and described second
Current branch 144b makes the rising edge be rapidly achieved high level.It can for the failing edge of the random stamp signal 138 of spread spectrum
To use similar operation, so that the edge time of the failing edge increases, the final random stamp signal 138 of spread spectrum passes through
After the edge time adjustment module 14, dynamic edge stamp signal 146 is obtained；The dynamic edge stamp signal 146 is
The dynamic edge stamp signal TXd for being supplied to the booster circuit 2 as shown in Figure 1.
It should be noted that the quantity of the first current branch 144a and the second current branch 144b is unlimited, it can
It is set with the needs according to actual product.The first current branch 144a and the second current branch 144b and the side simultaneously
The on-off connected along time adjusting circuit 142 can control the switching of the switching switch 143 by programmable software to carry out
The switching times of control, the switching switch 143 are unlimited.The dynamic edge stamp signal 146 can be as shown in Figure 4
Axisymmetric signal is also possible to asymmetrical signal.
Fig. 5 be according to Fig. 1 in embodiment booster circuit structural schematic diagram.Booster circuit 2 in the present embodiment
In addition to include stamp signal receiving end 25 in Fig. 1 shown in booster circuit 2, power supply receiving end 28, high voltage power supply output end 29a and
High-voltage signal except output end 29b, further include a plurality of voltage converting branch 201a-201d and a plurality of boosting branch 202a-
202c, the power supply receiving end 28 are included in a plurality of voltage converting branch 201a-201d.It uses the power supply receiving end 28
To receive the host computer control module 3 by the analog power AVDD of the power output end 31 output to guarantee the liter
Volt circuit 2 works normally.
The a plurality of boosting branch 202a-202c is to distinguish the voltage magnitude of the dynamic edge stamp signal 146
Multiple boosting processing is carried out, to form two groups of high pressure stamp signals with frequency, and respectively as the chip power signal SVCC
With the chip earth signal SGND.
The a plurality of voltage converting branch 201a-201d, to open the boosting of a plurality of boosting branch 202a-202c
Processing status, a plurality of voltage converting branch 201a-201d are respectively turned on a plurality of boosting branch 202a-202c simultaneously
When, the voltage magnitude of the dynamic edge stamp signal 146 is to be lifted.
The input signal of the booster circuit 2 includes dynamic edge stamp signal 25a and reverse signal 25b, described reversed
Signal 25b can be obtained by the dynamic edge stamp signal 25a by phase inverter 26, as shown in Figure 5.The dynamic edge
Stamp signal 25a is the dynamic edge stamp signal 146 that edge time adjustment module 14 as shown in Figure 4 exports.Institute
The output signal for stating booster circuit 2 includes the chip power signal SVCC and the chip earth signal SGND.Wherein, the core
Piece power supply signal SVCC and the chip earth signal SGND pass through the high voltage power supply output end 29a and the high-voltage signal respectively
Ground output end 29b is output to the chip power receiving end 11a and the chip ground terminal 11b, mentions for the master chip circuit 12
Power supply source guarantees the normal communication and work of fingerprint detection chip 1.
In the embodiment shown in fig. 5, the booster circuit 2 is specifically by taking three boosting branch 202a-202c as an example, but
It should be appreciated that the quantity of the boosting branch of the booster circuit 2 can be according to the high frequency stamp in other alternate embodiments
Depending on the amplitude of signal needs.Three boosting branches 202a-202c is denoted as the first boosting branch 202a, the second boosting respectively
Branch 202b and third boosting branch 202c.
In the embodiment shown in fig. 5, the booster circuit 2 is specifically by taking four voltage converting branch 201a-201d as an example,
It being understood, however, that the quantity of the voltage converting branch of the booster circuit 2 can be according to described in other alternate embodiments
Depending on the quantity of branch of boosting.Four voltage converting branch 201a-201d be denoted as respectively first voltage converting branch 201a,
Second voltage converting branch 201b, tertiary voltage converting branch 201c and the 4th voltage converting branch 201d.
Four voltage converting branch 201a-201d and three boosting branches 202a-202c can be specifically included
The power supply receiving end 28；Diode 21a, diode 21b, diode 21c；Capacitor 22a, capacitor 22b, capacitor 22c；Switch
23a, switch 23b, switch 23c, switch 24a, switch 24b, switch 24c.Wherein, the switch 23a, the switch 23b and institute
Stating switch 23c is first group of switch, and the switch 24a, the switch 24b and the switch 24c are second group of switch.
The booster circuit 2 receives the dynamic edge by the stamp signal receiving end 25 (being not shown in Fig. 5)
After stamp signal 25a, the dynamic edge stamp signal 25a is available to first group of switch 23a-23c, described in control
The on off operating mode of first group of switch 23a-23c.On the other hand, the dynamic edge stamp signal 25a passes through the phase inverter 26
It is converted into after the reverse signal 25b, is provided to second group of switch 24a-24c, opened with controlling described second group
Close the on off operating mode of 24a-24c.
The first voltage converting branch 201a includes the power supply receiving end 28 and the switch 23a, the power supply
Receiving end 28 is directly connected to the switch 23a.
The second voltage converting branch 201b includes the power supply receiving end 28, the diode 21a and described opens
23b is closed, the power supply receiving end 28 connects the anode of the diode 21a, and the cathode of the diode 21a connects the switch
23b。
The tertiary voltage converting branch 201c includes the power supply receiving end 28, the diode 21b and described opens
23c is closed, the power supply receiving end 28 connects the anode of the diode 21b, and the cathode of the diode 21b connects the switch
One end of 23c, the other end of the switch 23c with connecting high-voltage signal output end 29b.
The 4th voltage converting branch 201d includes the power supply receiving end 28 and the diode 21c, the electricity
Source receiving end 28 connects the anode of the diode 21c, and the cathode of the diode 21c connects the high voltage power supply output end
29a。
The first boosting branch 202a includes the capacitor 22a and switch 24a.The cathode of the capacitor 22a
It is grounded by the switch 24a, comprising boost node 210 between the cathode of the capacitor 22a and the switch 24a, described the
One voltage converting branch 201a is connect by the switch 23a with the boost node 210；The anode connection of the capacitor 22a
Boost node 211a, the boost node 211a connection second voltage converting branch 201b, and it is connected to the diode
Between the cathode of 21a and the switch 23b.
The second boosting branch 202b includes the capacitor 22b and switch 24b.The cathode of the capacitor 22b
It is grounded by the switch 24b, comprising boost node 211b between the cathode of the capacitor 22b and the switch 24b, described the
Two voltage converting branch 201b are connect by the switch 23b with the boost node 211b；The anode connection of the capacitor 22b
Boost node 212a, the boost node 212a connection tertiary voltage converting branch 201c, and it is connected to the diode
Between the cathode of 21b and the switch 23c.
The third boosting branch 202c includes the capacitor 22c and switch 24c.The cathode of the capacitor 22c
It is grounded by the switch 24c, comprising boost node 212b between the cathode of the capacitor 22c and the switch 24c, described the
Three voltage converting branch 201c are connect by the switch 23c with the boost node 212b, and described boost node 212b
In the switch 23c and the high-voltage signal between output end 29b；The anode connection boost node 213 of the capacitor 22c,
The 4th voltage converting branch 201d is connect by the cathode of the diode 21c with the boost node 213, and the liter
Press node 213 between the diode 21c and the high voltage power supply output end 29a.
The working principle of the booster circuit 2 are as follows: first group of switch 23a-23c and second group of switch 24a-
24c is that high level is effective, and the dynamic edge stamp signal 25a controls first group of switch 23a-23c；The reversed letter
Number 25b controls second group of switch 24a-24c.
When the reverse signal 25b high level arrives, first group of switch 23a-23c is disconnected and described second group is opened
It closes and closes 24a-24c, the analog power AVDD flows through the diode 21a, the diode 21b and the diode 21c
It charges respectively to the capacitor 22a, the capacitor 22b and the capacitor 22c afterwards, at this time high-voltage signal ground output end
29b exports low level 0V；
When the dynamic edge stamp signal 25a high level arrives, first group of switch 23a-23c closure and described
Second group of switch 24a-24c is disconnected, and due to the presence of the diode 21a-21c, has cut off the analog power AVDD and institute
The connection between capacitor 22a-22c is stated, so that the capacitor 22a, the capacitor 22b and the capacitor 22c are cascaded, institute
The voltage of chip power signal SVCC and the chip earth signal SGND are stated since the boot strap of capacitor is elevated, it is described at this time
The amplitude of chip earth signal SGND output voltage is 3* analog power AVDD, wherein the waveform such as 27 of the chip earth signal SGND
It is shown.
Fig. 6 is the random stamp signal of spread spectrum and fixed sequence program stamp signal according to one embodiment of the disclosure in full range
The simulation curve schematic diagram for the EMI value that section generates.As shown in fig. 6, solid line 11 represents the fixed sequence in figure in rectangular coordinate system
For the EMI value that column stamp signal generates with the variation tendency of frequency, dotted line 12 represents the EMI that the random stamp signal of the spread spectrum generates
It is worth the variation tendency with frequency.Compared with the fixed sequence program stamp signal is in the EMI value that full frequency band generates, the spread spectrum is random
Stamp signal is whole lower in the EMI value that full frequency band generates.Moreover, dotted line 12 is with frequency increase side with the increase of frequency
To second inflection point after, the absolute value of slope becomes larger, greater than the absolute value of 11 slope of solid line under identical frequency.Meaning
, after second inflection point of dotted line 12, the EMI value generated is dropped the random stamp signal of spread spectrum with faster rate
It is low, illustrate that the EMI generated in full frequency band can be effectively reduced using the random stamp signal driving fingerprint detection chip of the spread spectrum,
Interference of the stamp signal to mobile device radio communication can be effectively reduced when carrying out fingerprint detection.
Fig. 7 is the structural schematic diagram according to the fingerprint detection stamp device of one embodiment of the disclosure.Fingerprint detection is beaten
Code device 6 includes fingerprint detection chip 1 and booster circuit 2 as shown in Figure 1.The booster circuit 2 is referred to as shown in Figure 5
Booster circuit structure.
Fig. 8 is the electronic equipment according to one embodiment of the disclosure.Electronic equipment 7 includes display screen 8 and is located at described
The fingerprint detection stamp device 6 of 8 lower section of display screen, the fingerprint detection stamp device 6 is as shown in Figure 7.
Although present disclosure includes many details, these are not necessarily to be construed as to any invention or claimed
The limitation of range, but be interpreted to can be the description of feature specific to the specific embodiment to specific invention.This patent
Certain features described in file can also combine realization in a single embodiment in the context of separate embodiments.On the contrary,
The various features described in the context of single embodiment can also be implemented separately in various embodiments or with any suitable
Sub-portfolio form realize.Although working in certain combinations moreover, feature can be described above as, and even initially
It is so claimed, but can be deleted from combination in some cases from claimed combined one or more features
It removes, and claimed combination can be related to the deformation of sub-portfolio or sub-portfolio.
Similarly, although describing operation in the accompanying drawings with particular order, this should not be construed as requiring these operations
The particular order shown in successively executes in sequence, or require execute it is all shown in operate, to realize desired knot
Fruit.Moreover, the various individual system units in the embodiment described in this patent document should not be construed as in all implementations
This separation is needed in example.
It will be understood by those skilled in the art that the various embodiments described above are the specific embodiments of realization the application, and
In practical applications, can to it, various changes can be made in the form and details, without departing from scope of the present application.
Claims (22)
1. a kind of fingerprint detection stamp device characterized by comprising fingerprint detection chip, the fingerprint detection chip include
Stamp signal generator module and edge time adjust module；
The stamp signal generator module is to generate the random stamp signal of spread spectrum, and the edge time adjustment module is to institute
It states and spreads the edge time of random stamp signal and be adjusted, obtain dynamic edge stamp signal.
2. fingerprint detection stamp device according to claim 1, which is characterized in that the stamp signal generator module includes
Random signal generation module, the random signal generation module is to generate irregular random signal.
3. fingerprint detection stamp device according to claim 2, which is characterized in that the stamp signal generator module also wraps
Amplitude quantization module is included, the amplitude quantization module obtains digital quantization letter to carry out digital quantization to the random signal
Number.
4. fingerprint detection stamp device according to claim 3, which is characterized in that the stamp signal generator module also wraps
Pulse-width adjustment module is included, the pulse-width adjustment module obtains pulsewidth tune to carry out pulse-width adjustment to the digital quantization signal
Entire signal.
5. fingerprint detection stamp device according to claim 4, which is characterized in that the stamp signal generator module also wraps
The random stamp module of spread spectrum is included, the random stamp module of spread spectrum is obtained to carry out spread spectrum operation to the pulse-width adjustment signal
To the random stamp signal of spread spectrum.The random stamp signal of spread spectrum includes that standard high level and standard are low in one cycle
Level, the standard high level and the standard low level respectively have the level of specific time length, and the standard
High level and the low level number of the standard be respectively it is fixed, the standard high level and the standard low level are at one
It is random distribution in period, the standard high level and the low level total time length of the standard are exactly that a cycle is long
Degree.
6. fingerprint detection stamp device according to claim 1, which is characterized in that the edge time adjusts module and includes
Edge time adjustment circuit, the first current branch and the second current branch, first current branch or the second electric current branch
The edge time adjustment circuit is connected on road, to provide charging current, and the charging electricity that second current branch provides
Stream is greater than the charging current that first current branch provides.
7. fingerprint detection stamp device according to claim 6, which is characterized in that the edge time adjustment module is also wrapped
Include switching switch, the switching switch to switch the edge time adjustment circuit and first current branch or with it is described
On-off between second current branch, further control enters the random stamp letter of the spread spectrum of edge time adjustment module
Number edge time.
8. fingerprint detection stamp device according to claim 7, which is characterized in that the random stamp signal of spread spectrum enters
After the edge time adjustment module, edge time adjustment circuit described in the switching switching and first current branch
Between on-off, to increase the edge time of the random stamp signal of the spread spectrum；When edge described in the switching switching
Between on-off between adjustment circuit and second current branch, reach the edge of the random stamp signal of spread spectrum quickly
To predetermined level, the predetermined level is the high level or low level of the random stamp signal of spread spectrum.
9. fingerprint detection stamp device according to claim 1, which is characterized in that the fingerprint detection chip further includes master
Chip circuit, the master chip circuit realize the normal of the fingerprint detection chip to receive the power supply signal of extraneous offer
Communication and work.
10. fingerprint detection stamp device according to claim 9, which is characterized in that the fingerprint detection stamp device is also
Including booster circuit, input of the dynamic edge stamp signal of the edge time adjustment module output as the booster circuit
Signal, the booster circuit is to be converted to two groups of high pressure stamp signals with frequency for the dynamic edge stamp signal, respectively
For chip power signal and chip earth signal, and the difference of the amplitude of the chip power signal and the chip earth signal every bit
It keeps constant.The chip power signal and the chip earth signal provide power supply for the master chip circuit to guarantee the finger
The normal communication and work of line detection chip.
11. fingerprint detection stamp device according to claim 10, which is characterized in that the booster circuit includes stamp letter
Number receiving end, a plurality of boosting branch and a plurality of voltage converting branch.
The stamp signal receiving end is to receive the dynamic edge stamp signal；
The a plurality of boosting branch the voltage magnitude of the dynamic edge stamp signal is carried out multiple boosting processing respectively,
To form two groups of high pressure stamp signals with frequency, and respectively as the chip power signal and the chip earth signal；
Boosting processing status of a plurality of voltage converting branch to open a plurality of boosting branch, a plurality of voltage turn
When changing branch while being respectively turned on a plurality of boosting branch, the voltage magnitude of the dynamic edge stamp signal is to be lifted.
12. fingerprint detection stamp device according to claim 11, which is characterized in that the booster circuit further includes high pressure
Power output end and high-voltage signal ground output end.The high voltage power supply output end and the high-voltage signal output end respectively to
Export the chip power signal and the chip earth signal.
13. fingerprint detection stamp device according to claim 10, which is characterized in that the fingerprint detection chip further includes
Chip power receiving end and chip ground terminal, the chip power receiving end and the chip ground terminal are respectively to receive the chip
Power supply signal and the chip earth signal.
14. fingerprint detection stamp device according to claim 12, which is characterized in that a plurality of voltage converting branch packet
Include first voltage converting branch, second voltage converting branch and tertiary voltage converting branch.
The first voltage converting branch includes power supply receiving end and first switch, and the power supply receiving end is opened with described first
Pass is directly connected to.The power supply receiving end is to receive the analog power of extraneous offer, to power for the booster circuit.
The second voltage converting branch includes the power supply receiving end, first diode and second switch, and the power supply connects
Receiving end connects the anode of the first diode, and the cathode of the first diode connects the second switch.
The tertiary voltage converting branch includes that the power supply receiving end, the second diode and third switch, the power supply connect
Receiving end connects the anode of second diode, and the cathode of second diode connects one end of the third switch, described
The other end of third switch with connecting high-voltage signal output end.
The 4th voltage converting branch includes the power supply receiving end and third diode, and the power supply receiving end connects institute
The anode of third diode is stated, the cathode of the third diode connects the high voltage power supply output end.
The first switch, the second switch and third switch are first group of switch.
15. fingerprint detection stamp device according to claim 14, which is characterized in that a plurality of boosting branch includes the
One boosting branch, the second boosting branch and third boosting branch.
The first boosting branch includes first capacitor and the 4th switch.The cathode of the first capacitor is opened by the described 4th
Ground connection is closed, includes the first boost node between the cathode of the first capacitor and the 4th switch, the first voltage conversion
Branch is connect by the first switch with first boost node；Anode connection the second boosting section of the first capacitor
Point, second boost node connects the second voltage converting branch, and is connected to cathode and the institute of the first diode
It states between second switch.
The second boosting branch includes the second capacitor and the 5th switch.The cathode of second capacitor is opened by the described 5th
Ground connection is closed, includes third boost node between the cathode of second capacitor and the 5th switch, the second voltage conversion
Branch is connect by the second switch with the third boost node；The 4th boosting section of anode connection of second capacitor
Point, the 4th boost node connects the tertiary voltage converting branch, and is connected to cathode and the institute of second diode
It states between third switch.
The third boosting branch includes third capacitor and the 6th switch.The cathode of the third capacitor is opened by the described 6th
Ground connection is closed, includes the 5th boost node between the cathode of the third capacitor and the 6th switch, the tertiary voltage conversion
Branch is switched by the third and is connect with the 5th boost node, and the 5th boost node is located at third switch
With the high-voltage signal between output end；Anode the 6th boost node of connection of the third capacitor, the 4th voltage turn
It changes branch to connect by the cathode of the third diode with the 6th boost node, and the 6th boost node is located at institute
It states between third diode and the high voltage power supply output end.
4th switch, the 5th switch and the 6th switch are second group of switch.
16. fingerprint detection stamp device according to claim 15, which is characterized in that the input signal of the booster circuit
It further include the reverse signal of the dynamic edge stamp signal, the dynamic edge stamp signal controls first group of switch,
The reverse signal controls second group of switch.
17. fingerprint detection stamp device according to claim 16, which is characterized in that the reverse signal is by the dynamic
Edge stamp signal is obtained by phase inverter.
18. fingerprint detection stamp device according to claim 16, which is characterized in that first group of switch and described
Two groups of switches are all that high level is effective, and when the high level of the dynamic edge stamp signal arrives, described first group is closed the switch
And second group of switch disconnects；When the high level of the reverse signal arrives, first group of switch disconnection and described second
Group closes the switch.
19. a kind of fingerprint detection system, which is characterized in that beaten including fingerprint detection described in any one of claims 1 to 18
Code device.
20. fingerprint detection system according to claim 19, which is characterized in that the fingerprint detection system further includes host
Control module, the host computer control module is to provide analog power to the booster circuit.
21. fingerprint detection system according to claim 20, which is characterized in that the fingerprint detection system further includes level
Conversion module, the level switch module is to convert the electricity between the host computer control module and the fingerprint detection chip
It is flat, make the electrical level match between the host computer control module and the fingerprint detection chip.
22. a kind of electronic equipment, which is characterized in that the fingerprint detection stamp dress including display screen and below the display screen
It sets, the fingerprint detection stamp device includes the fingerprint detection stamp device as described in any one of claims 1 to 18.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/112038 WO2020082323A1 (en) | 2018-10-26 | 2018-10-26 | Fingerprint detection coding apparatus, fingerprint detection system and electronic device |
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| Publication Number | Publication Date |
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| CN109496315A true CN109496315A (en) | 2019-03-19 |
| CN109496315B CN109496315B (en) | 2022-05-03 |
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| CN201880002331.5A Active CN109496315B (en) | 2018-10-26 | 2018-10-26 | Fingerprint detection coding device, fingerprint detection system and electronic equipment |
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| WO (1) | WO2020082323A1 (en) |
Cited By (1)
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|---|---|---|---|---|
| WO2022056860A1 (en) * | 2020-09-18 | 2022-03-24 | 深圳市汇顶科技股份有限公司 | Touch chip, coding method and electronic device |
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| CN114256864B (en) * | 2021-12-13 | 2023-10-13 | 湖南大学 | Fixed time control method and device for SVCC in high-voltage direct-current transmission system |
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| CN109496315B (en) | 2022-05-03 |
| WO2020082323A1 (en) | 2020-04-30 |
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