CN206236114U - A kind of fingerprint identification device with virtual key - Google Patents
A kind of fingerprint identification device with virtual key Download PDFInfo
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- CN206236114U CN206236114U CN201621200865.3U CN201621200865U CN206236114U CN 206236114 U CN206236114 U CN 206236114U CN 201621200865 U CN201621200865 U CN 201621200865U CN 206236114 U CN206236114 U CN 206236114U
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- virtual key
- fingerprint
- amplification circuit
- fingerprint identification
- circuit
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Abstract
A kind of fingerprint identification device with virtual key, is related to fingerprint identification device technical field.The fingerprint identification module solved on the intelligent terminals such as existing mobile phone each works independently with condenser type virtual key, there is the wasting of resources, the technical deficiency of high cost, includes fingerprint detection unit, fingerprint pre-amplification circuit, sampling hold circuit, D/A conversion unit and digital signal processor；Analog signal multichannel recombiner is provided between described fingerprint pre-amplification circuit and sampling hold circuit, the signal input part of described analog signal multichannel recombiner is connected with virtual key pre-amplification circuit, and the signal input part of virtual key pre-amplification circuit is connected with more than one virtual key electrode.The integrated capacitive virtual key in existing fingerprint identification module, reduces cost, save resources, in the case where little cost is spent, enrich the function of fingerprint module, increased the use possibility of user.
Description
Technical field
The utility model is related to fingerprint identification device technical field.
Background technology
Currently, finger print detection device has begun to be widely used in the intelligent terminals such as mobile phone, Fig. 1 be common mobile phone just
Face structure chart, many mobile phones can all include capacitive virtual key 2 in touch-screen and the lower section of display screen 1.Typical case
Under, fingerprint identification module 3 can be placed on centre, and condenser type virtual key 2 places its both sides.
Existing fingerprint identification module 3 each works independently with condenser type virtual key 2, but both operation principles have phase
Like part, equivalent to the simplified structure of fingerprint identification module 3, condenser type virtual key 2 need to sense is condenser type virtual key 2
It is no to there is finger to touch, also nonrecognition fingerprint characteristic.
Current most of fingerprint identification modules 3 use capacitive detection mode, basic Cleaning Principle as shown in Figure 2,
Cfinger is the electric capacity between finger and the detecting electrode of detection unit, and Cref is the feedback capacity of amplifier.At first
Under phase, on-off circuit SW1 and on-off circuit SW2 is closed, and on-off circuit SW3 disconnects, and is now in reset state, charge amplifier
Output voltage Vout outputs 0.Under the second phase, on-off circuit SW1 and on-off circuit SW2 disconnects, on-off circuit SW3 closures,
Now the positive input terminal current potential of charge amplifier is Vin, then the output voltage Vout=of charge amplifier（1+Cfinger/
Cref）*Vin.The output voltage Vout of charge amplifier is by sampling hold circuit（S/H）After D/A conversion unit ADC, turn
It is changed to data signal and exports and is further processed to digital signal processor.
The general principle of condenser type virtual key is identical with the general principle of fingerprint recognition detection unit, differs only in electricity
Hold the of different sizes of Cfinger and electric capacity Cref.The function of condenser type virtual key, can particularly simple be integrated into fingerprint knowledge
In other module.If using the two completely self-contained circuit structure, there is the unnecessary wasting of resources in high cost.
The content of the invention
In sum, the purpose of this utility model be solve fingerprint identification module on the intelligent terminals such as existing mobile phone with
Condenser type virtual key each works independently, and there is the wasting of resources, the technical deficiency of high cost, and proposes a kind of band virtual key
Fingerprint identification device.
By solve the utility model proposed technical problem, the technical scheme for using for：A kind of fingerprint with virtual key
Identifying device, includes fingerprint detection unit, connects the fingerprint pre-amplification circuit of fingerprint detection unit, is put before connection fingerprint
The sampling hold circuit of big circuit, connects the D/A conversion unit of sampling hold circuit, and the number for connecting D/A conversion unit
Word signal processor；It is characterized in that：Analog signal is provided between described fingerprint pre-amplification circuit and sampling hold circuit
Multichannel recombiner, the signal input part of described analog signal multichannel recombiner is connected with virtual key pre-amplification circuit, empty
The signal input part for intending button pre-amplification circuit is connected with more than one virtual key electrode.
LED drive module is also included, the promising described each virtual key electrode of LED drive module connection provides backlight
LED.
Described LED drive module is open-drain drive circuit, and output pulse width modulated signal drives the grid of the NMOS tube of open-drain
Pole, the grid of NMOS tube controls the switch and brightness adjustment of LED.
Described virtual key electrode includes two, is respectively distributed to the fingerprint detection unit left and right sides.
The beneficial effects of the utility model are：The utility model only need to increase in existing fingerprint identification module it is virtual by
Pre-amplification circuit and analog signal multichannel recombiner used by key, it is possible to integrated capacitive virtual key, most of circuit
Can share, reduces cost, save resources, in the case where little cost is spent, enrich the function of fingerprint module, increased
The use possibility of user.
Brief description of the drawings
Fig. 1 is common mobile phone positive structure schematic；
Fig. 2 is the circuit theory schematic diagram of existing fingerprint identification module；
Fig. 3 is circuit block diagram of the present utility model.
Specific embodiment
The structure of utility model is further said below in conjunction with accompanying drawing and the utility model preferred specific embodiment
It is bright.
Shown in reference picture 3, fingerprint identification device of the utility model with virtual key includes fingerprint detection unit,
The fingerprint pre-amplification circuit of fingerprint detection unit is connected, the sampling hold circuit S/H of fingerprint pre-amplification circuit, connection is connected
The D/A conversion unit ADC of sampling hold circuit S/H, and connect the digital signal processor of D/A conversion unit ADC；It is described
Fingerprint pre-amplification circuit and sampling hold circuit S/H between be provided with analog signal multichannel recombiner, described analog signal
The signal input part of multichannel recombiner is connected with virtual key pre-amplification circuit, and the signal of virtual key pre-amplification circuit is defeated
Enter end and be connected with more than one virtual key electrode；Virtual key electrode is respectively distributed to as a example by two in the present embodiment
The fingerprint detection unit left and right sides；Virtual key electrode can be distributed in any portion on the intelligent terminals such as mobile phone as needed
Position.The integrated existing fingerprint identification module of the utility model and condenser type virtual key are that is to say, it is multiple by analog signal multichannel
A set of sampling hold circuit S/H is arrived in output after be combined for the analog signal of two-way or multichannel condenser type virtual key by clutch, quite
A set of sampling hold circuit S/H, D/A conversion unit ADC and digital signal processor are shared in the two, simplifies circuit, reduced into
This, lifts product reliability.
For the ease of in the environment of dark, can exactly touch-control to corresponding virtual key electrode, this practicality
New also to include LED drive module, the promising described each virtual key electrode of LED drive module connection provides the LED of backlight
Lamp.Described LED drive module can be open-drain drive circuit, and output pulse width modulated signal drives the grid of the NMOS tube of open-drain
Pole, the grid of NMOS tube controls the switch and brightness adjustment of LED.LED can certainly be controlled using other LED drive modules
Lamp.
Claims (4)
1. a kind of fingerprint identification device with virtual key, includes fingerprint detection unit, connects the fingerprint of fingerprint detection unit
Pre-amplification circuit, connects the sampling hold circuit of fingerprint pre-amplification circuit, connects the digital-to-analogue conversion list of sampling hold circuit
Unit, and connect the digital signal processor of D/A conversion unit；It is characterized in that：Described fingerprint pre-amplification circuit with adopt
Analog signal multichannel recombiner is provided between sample holding circuit, the signal input part of described analog signal multichannel recombiner is connected
Have a virtual key pre-amplification circuit, the signal input part of virtual key pre-amplification circuit be connected with it is more than one it is virtual by
Key electrode.
2. a kind of fingerprint identification device with virtual key according to claim 1, it is characterised in that：Also include LED
Drive module, the promising described each virtual key electrode of LED drive module connection provides the LED of backlight.
3. a kind of fingerprint identification device with virtual key according to claim 2, it is characterised in that：Described LED drives
Dynamic model block is open-drain drive circuit, and output pulse width modulated signal drives the grid of the NMOS tube of open-drain, the grid control of NMOS tube
The switch and brightness adjustment of LED.
4. a kind of fingerprint identification device with virtual key according to claim 1, it is characterised in that：Described virtually presses
Key electrode includes two, is respectively distributed to the fingerprint detection unit left and right sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621200865.3U CN206236114U (en) | 2016-11-08 | 2016-11-08 | A kind of fingerprint identification device with virtual key |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621200865.3U CN206236114U (en) | 2016-11-08 | 2016-11-08 | A kind of fingerprint identification device with virtual key |
Publications (1)
| Publication Number | Publication Date |
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| CN206236114U true CN206236114U (en) | 2017-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621200865.3U Active CN206236114U (en) | 2016-11-08 | 2016-11-08 | A kind of fingerprint identification device with virtual key |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519845A (en) * | 2018-03-09 | 2018-09-11 | 京东方科技集团股份有限公司 | Terminal and its control method |
-
2016
- 2016-11-08 CN CN201621200865.3U patent/CN206236114U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519845A (en) * | 2018-03-09 | 2018-09-11 | 京东方科技集团股份有限公司 | Terminal and its control method |
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