CN205750817U - Fingerprint recognition structure, display device - Google Patents
Fingerprint recognition structure, display device Download PDFInfo
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- CN205750817U CN205750817U CN201620519770.1U CN201620519770U CN205750817U CN 205750817 U CN205750817 U CN 205750817U CN 201620519770 U CN201620519770 U CN 201620519770U CN 205750817 U CN205750817 U CN 205750817U
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Abstract
This utility model provides a kind of fingerprint recognition structure, display device, belongs to fingerprint identification technology field, and it can solve, and the signal to noise ratio of induced signal in existing fingerprint identification method is low, the problem of fingerprint recognition poor accuracy.Fingerprint recognition structure of the present utility model includes: luminescence unit, for luminous to finger；Photosensitive unit, is located at the position that can receive the light that the luminescence unit reflected by finger sends, and produces induced signal for the intensity according to the light received；Modulated signal generation unit, for producing the modulated signal with modulating frequency, and controls described luminescence unit with modulating frequency flashing by modulated signal；Demodulating unit, is connected with described photosensitive unit, for being demodulated described induced signal.
Description
Technical field
This utility model belongs to fingerprint identification technology field, is specifically related to a kind of fingerprint recognition structure, display device.
Background technology
Along with the development of technology, the display device such as a lot of mobile phones, panel computer starts have fingerprint identification function.A kind of existing
Some fingerprint recognition modes are as it is shown in figure 1, display floater (as a example by display panels 71, is additionally provided with backlight outside its incidence surface
Unit 72) in be provided with multiple photosensitive unit 1, when finger by a display panel time, the luminous reflectance that display floater sends can be returned
Each photosensitive unit 1, and the paddy 91 of fingerprint is different to the reflection of light with ridge 92, therefore the photosensitive unit 1 corresponding with paddy 91 and ridge 92 produces
Raw induced signal (such as photoelectric current) is different, i.e. be can determine that the pattern of fingerprint by the induced signal of relatively each photosensitive unit.
But, due to the restriction of the size of light-sensitive device, performance etc. in photosensitive unit, its induced signal (photoelectricity produced
Stream) the least；Relative, ambient light, leakage current, parasitic capacitance, circuit interference etc. the noise signal then intensity produced is relatively
Greatly.Therefore, the signal to noise ratio of actual induced signal is low, and noise signal is difficult to remove, thus causes the precision of fingerprint recognition low.
Utility model content
This utility model embodiment provides the fingerprint recognition that signal to noise ratio is high, fingerprint recognition accuracy is high of a kind of induced signal
Structure, display device.
Solve this utility model technical problem and be employed technical scheme comprise that a kind of fingerprint recognition structure, comprising:
Luminescence unit, for luminous to finger；
Photosensitive unit, is located at the position that can receive the light that the luminescence unit reflected by finger sends, for according to reception
Light intensity produce induced signal；
Modulated signal generation unit, for producing the modulated signal with modulating frequency, and controls described by modulated signal
Luminescence unit is with modulating frequency flashing；
Demodulating unit, is connected with described photosensitive unit, for being demodulated described induced signal.
Preferably, described demodulating unit includes: block isolating circuit, and its input connects photosensitive unit；Demodulator circuit, it is defeated
Enter end and connect the outfan of block isolating circuit；Low-pass filter circuit, its input connects the outfan of demodulator circuit.
Preferably, described photosensitive unit is the photosensitive unit for producing sensor current signal；Described fingerprint recognition is tied
Structure also includes: the current/voltage converting unit being connected between described photosensitive unit and demodulating unit.
Preferably, described modulated signal generation unit is also connected with described demodulating unit, for by described modulated signal
It is delivered to demodulating unit as demodulation carrier signal.
Solve this utility model technical problem and be employed technical scheme comprise that a kind of display device, comprising:
Above-mentioned fingerprint recognition structure.
Preferably, described display device includes: display panels, and described display panels includes multiple pixel,
And described photosensitive unit is located in display panels；It is located at the back light unit outside described display panels incidence surface, described
Back light unit is described luminescence unit；Described modulated signal generation unit is connected with back light unit, and believes with its modulation produced
Number drive described back light unit luminous.
It may further be preferable that described photosensitive unit is located at the interval of neighbor.
It may further be preferable that described display panels includes that array base palte and color membrane substrates, described photosensitive unit set
In described array base palte or color membrane substrates.
Preferably, described display device includes: LED display panel, described LED display panel bag
Include multiple pixel, and described photosensitive unit is located in LED display panel.
It may further be preferable that each described pixel includes light emitting diode and driving for driven for emitting lights LED lighting
Galvanic electricity road, described drive circuit includes the switching thin-film transistor directly connected with light emitting diode, described switch film crystal
Allow electric current to flow through described light emitting diode during pipe conducting, during shutoff, do not allow electric current to flow through described light emitting diode；Described tune
Signal generation unit processed is connected with the grid of switching thin-film transistor.
It may further be preferable that described photosensitive unit is located at the interval of neighbor.
It may further be preferable that described LED display panel includes array base palte and to box substrate, described photosensitive
Unit is located at described array base palte or in box substrate.
Preferably, described display device includes: multiple pixels, and each pixel includes described luminescence unit and for driving
The drive circuit that luminescence unit is luminous, described drive circuit includes switching device, described switching device for by luminescence unit with
Other partially ON or cut-outs of drive circuit；Described modulated signal generation unit is connected with switching device, and produces with it
Modulated signal controls the on or off of described switching device.
In fingerprint recognition structure of the present utility model, modulated signal generation unit can control luminescence unit according to characteristic frequency
Flashing, the light reflected by finger that photosensitive unit receives also is flashed by modulating frequency, therefore the sense produced because of reflection light
Induction signal is equivalent to have passed through the modulation of modulating frequency；Accordingly, the noise signal produced because of ambient light, circuit etc. is with luminous
The luminous situation of unit is unrelated, therefore there is no frequency characteristic (being equivalent to it without modulation)；Therefore, induced signal is being solved
After tune, can effectively remove noise signal therein, thus realize the separation of noise, improve its signal to noise ratio, it is achieved more accurate
Fingerprint recognition.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of the display device with fingerprint identification function；
Fig. 2 is the principle schematic of modulation /demodulation；
Fig. 3 is the composition frame chart of a kind of fingerprint recognition structure of embodiment of the present utility model；
Fig. 4 is that the structure of the current/voltage converting unit in a kind of fingerprint recognition structure of embodiment of the present utility model is shown
It is intended to；
Fig. 5 is that the action principle of the block isolating circuit in a kind of fingerprint recognition structure of embodiment of the present utility model is intended to；
Fig. 6 is the structural representation of the block isolating circuit in a kind of fingerprint recognition structure of embodiment of the present utility model；
Fig. 7 is the structural representation of the demodulator circuit in a kind of fingerprint recognition structure of embodiment of the present utility model；
Fig. 8 is the structural representation of the low-pass filter circuit in a kind of fingerprint recognition structure of embodiment of the present utility model
Figure；
Fig. 9 be embodiment of the present utility model a kind of display device in the distribution schematic diagram of photosensitive unit；
Figure 10 be embodiment of the present utility model a kind of display device in the structure chart of drive circuit of pixel；
Figure 11 be embodiment of the present utility model a kind of display device in the driver' s timing figure of drive circuit of pixel；
Figure 12 be embodiment of the present utility model a kind of display device in produce the circuit of shift register of EM signal
Figure；
Figure 13 be embodiment of the present utility model a kind of display device in produce the driving of shift register of EM signal
Sequential chart；
Figure 14 be in circuit noise with the scattergram of frequency；
Wherein, reference is: 1, photosensitive unit；71, display panels；72, back light unit；91, paddy；92, ridge；
K1, the first switch；K2, second switch；K3, the 3rd switch；K4, the 4th switch；R1, the first resistance；R2, the second resistance；R3,
Three resistance；R4, the 4th resistance；M1, the first film transistor；M2, the second thin film transistor (TFT)；M3, the 3rd thin film transistor (TFT)；M4、
4th thin film transistor (TFT)；M5, the 5th thin film transistor (TFT)；M6, the 6th thin film transistor (TFT)；T, thin film transistor (TFT)；T1, first crystal
Pipe；T2, transistor seconds；T3, third transistor；T4, the 4th transistor；T5, the 5th transistor；T6, the 6th transistor；T7、
7th transistor；T8, the 8th transistor；T9, the 9th transistor；T10, the tenth transistor；T11, the 11st transistor；C, electricity
Hold；C1, the first electric capacity；C2, the second electric capacity；C3, the 3rd electric capacity；OLED, light emitting diode；Read, read line；Gate, grid
Line.
Detailed description of the invention
For making those skilled in the art be more fully understood that the technical solution of the utility model, real with concrete below in conjunction with the accompanying drawings
This utility model is described in further detail by mode of executing.
Embodiment 1:
As shown in Fig. 2 to Figure 14, the present embodiment provides a kind of fingerprint recognition structure, comprising:
Luminescence unit, for luminous to finger；
Photosensitive unit 1, is located at the position that can receive the light that the luminescence unit reflected by finger sends, for according to reception
Light intensity produce induced signal；
Modulated signal generation unit, for producing the modulated signal with modulating frequency, and controls luminescence by modulated signal
Unit is with modulating frequency flashing；
Demodulating unit, is connected with photosensitive unit 1, for being demodulated induced signal.
In the fingerprint recognition structure of the present embodiment, can be to the luminescence unit of finger luminescence and multiple including at least one
It is located at diverse location and the photosensitive unit 1 of different induced signal can be produced because intensity of illumination is different.Paddy 91 He due to fingerprint
Ridge 92 is different to the reflection of light, therefore the induced signal that the photosensitive unit 1 of corresponding fingerprint valley 91 and ridge 92 position produces is the most different, logical
Cross the induced signal that each photosensitive unit 1 is produced to be analyzed comparing, i.e. can determine that corresponding with each photosensitive unit 1 is fingerprint
What position, thus obtain fingerprint pattern, it is achieved fingerprint recognition.
Different from conventional fingerprint identification structure, the fingerprint recognition structure of the present embodiment also including, modulated signal produces single
Unit, it can produce the modulated signal (modulating carrier wave in other words) with modulating frequency (i.e. one specific frequency), such as, modulation
Signal can be the square-wave signal with modulating frequency.The modulated signal that modulated signal generation unit produces is used for controlling luminescence unit
Luminescence, thus when fingerprint recognition to be carried out, the luminescence that luminescence unit can flash according to this modulating frequency.Accordingly, this enforcement
Also including multiple demodulating unit in the fingerprint recognition structure of example, its induced signal that can be used for producing each photosensitive unit 1 is carried out
Demodulation, it is clear that induced signal should be demodulated by demodulating unit according to modulating frequency.
Certainly, above modulated signal generation unit can be multiple different form, such as square wave generation circuit, driving chip
Deng, it is not described in detail at this.Meanwhile, demodulating unit also should be connected with fingerprint recognition chip, in order to fingerprint recognition chip is to solution
Signal after tune is analyzed processing, and finally gives fingerprint, is also not described in detail it at this.
In the fingerprint recognition structure of the present embodiment, modulated signal generation unit can control luminescence unit according to characteristic frequency
Flashing, therefore the light reflected by finger that photosensitive unit 1 receives also is flashed by modulating frequency, the sense produced because of reflection light
Induction signal is also equivalent to have passed through the modulation of modulating frequency；Accordingly, the noise signal produced because of ambient light, circuit etc. with
The luminous situation of luminescence unit is unrelated, therefore there is no frequency characteristic (being equivalent to it without modulation)；Therefore, induced signal is being entered
After row demodulation, can effectively remove noise signal therein, thus realize the separation of noise, improve its signal to noise ratio, it is achieved more
Accurate fingerprint recognition.
Below the ultimate principle of modulation and demodulation is specifically introduced.For making the description of principle become apparent from, therefore use below
Sinusoidal wave as modulation carrier wave, it will be appreciated that other kinds of modulation carrier wave (such as the square wave of the present embodiment) can pass through Fourier
Launch to become sinusoidal wave form.Meanwhile, primary signal the most to be modulated uses the signal of significant change in time.
As in figure 2 it is shown, original signal to be modulated is V (t), i.e. the intensity of t signal is V (t), and it is equivalent to not adopt
The induced signal unrelated with frequency produced with photosensitive unit 1 during modulated signal generation unit of the present utility model.
Being modulated V (t) with the sine wave (modulation carrier wave) of characteristic frequency, obtaining the signal after modulation is X (t)=V (t)
×cos(ω0t+θ0), wherein ω0For sinusoidal wave angular frequency, θ0For its initial phase.This X (t) is equivalent to use this practicality new
After the modulated signal of type controls luminescence unit, the induced signal that photosensitive unit 1 produces, certainly, actual in induced signal now
Also include the noise the most unrelated with frequency, but do not show that in the drawings.
Being demodulated X (t) with the carrier wave of same frequency, the signal after can being demodulated is U (t)=X (t) × cos
(ω0t+θ1)×Vr×cos(ω0t-θ1), wherein Vr is the amplitude being manually set, θ1For demodulating the initial phase of carrier wave, for side
The most typically can make θ1=θ0.Thus, U (t)=0.5Vr × V (t)+0.5Vr × V (t) × cos (2 ω can be obtained further0t+2
θ0)；Wherein, if X (t) exists the noise signal not meeting modulating frequency, then can be removed and cannot be introduced into U (t), namely
Cannot be introduced into the signal after demodulation.
Afterwards U (t) being carried out low-pass filtering, i.e. can obtain V ' (t) signal of reduction, it is essentially identical with V ' (t) signal
Simply it is exaggerated noise signal in certain multiple, and X (t) and has been removed.
Preferably, photosensitive unit 1 is the photosensitive unit 1 for producing sensor current signal；Fingerprint recognition structure also includes:
The current/voltage converting unit being connected between photosensitive unit 1 and demodulating unit.
In fingerprint recognition, what general photosensitive unit 1 produced is all current signal, if photosensitive unit 1 can be photosensitive two poles
Pipe, phototriode, photoconductive resistance etc..As it is shown on figure 3, relatively difficult owing to directly current signal being processed, therefore can set
Put current/voltage converting unit (IV change-over circuit) and be transformed into voltage signal.And current/voltage converting unit can use multiple
Different forms, for example with the circuit shown in Fig. 4, wherein, for avoiding induced signal distortion, therefore the biasing of the amplifier in figure
Should be the least with offset current, at least it is less than two orders of magnitude of induced signal.
Preferably, demodulating unit comprises the steps that
Block isolating circuit, its input connects photosensitive unit 1；
Demodulator circuit, its input connects the outfan of block isolating circuit；
Low-pass filter circuit, its input connects the outfan of demodulator circuit.
Obviously, as in Fig. 5 a) shown in, photosensitive unit 1 have when having illumination forward output, unglazed according to time without output, but
Not having reversely output, therefore its induced signal produced is unidirectional square-wave signal (not considering noise), or perhaps has straight
The signal of flow component；And to be demodulated (all-wave phase demodulation), then first to remove DC component therein, and therefore, can be first
With block isolating circuit, induced signal is processed, remove DC component b) therein, and obtain c) waveform.Wherein, concrete every
Straight circuit can use multiple different form, for example with the circuit shown in Fig. 6, is not described in detail at this.
Carrying out after straight, i.e. can use demodulator circuit that signal is demodulated.Demodulator circuit can use shape as shown in Figure 7
Formula, the wherein input of the first end connection demodulator circuit of the first switch K1, the 4th switch K4, the second end connects the first electricity respectively
Resistance R1 and first end of the 3rd resistance R3；Second switch K2, first end of the 3rd switch K3 connect earth terminal, and the second end connects respectively
Connect the first resistance R1 and first end of the 3rd resistance R3；Second end of the first resistance R1 and the 3rd resistance R3 connects amplification the most respectively
The negative input end of device and positive input terminal, the outfan of amplifier then connects the outfan of demodulator circuit, and also the second resistance R2
It is connected between the negative input end of amplifier and outfan, has the 4th resistance R4 to be connected to positive input terminal and the earth terminal of amplifier
Between.Wherein, each switch is all controlled by demodulated signal (demodulation square wave), and second switch K2 and the 4th switch K4 synchronization action,
First switch K1 and the 3rd switch K3 synchronization action, and second switch K2 and first switch K1 state is contrary.Concrete, work as demodulation
When square wave is high level, second switch K2 and the 4th switch K4 conducting, the first switch K1 and the 3rd switch K3 turns off, and circuit is suitable
In in-phase amplification circuit, gain is just；And when demodulating square wave and being low level, second switch K2 and the 4th switch K4 turns off, the
One switch K1 and the 3rd switch K3 conducting, circuit is equivalent to see-saw circuit, and its gain amplifier is negative.Thus, when signal warp
After crossing this circuit, be equivalent to " being multiplied by " demodulation square wave, therefore achieve the demodulation of signal.Wherein, the particular type of each switch is
Various (such as the thin film transistor (TFT) contrary for type, its grid all inputs demodulation square wave), and the concrete form of demodulator circuit is also
It is various, therefore is all not described in detail at this.
Obviously, the signal that above demodulation obtains remains the signal with modulating frequency, therefore it can be carried out low pass filtered
Ripple, thus so that it becomes stable signal, in order to carry out follow-up process.Wherein, low-pass filtering can use multiple different shape
Formula, for example with the circuit shown in Fig. 8, is not described in detail at this.
Preferably, modulated signal generation unit is also connected with demodulating unit, for modulated signal is delivered to demodulating unit
As demodulation carrier signal.
That is, it is possible to modulated signal generation unit is directly connected with demodulating unit, thus its produce modulation letter
Number can directly as demodulation carrier wave in demodulation (as controlling each switch in Fig. 7).So, modulation can well be ensured
Having duplicate waveform and phase place with the carrier wave of demodulation, demodulation is the most accurate, and need not arrange extra generation demodulation load again
The device of ripple.Certainly, if demodulating unit includes being specifically designed to the circuit etc. producing demodulation carrier wave, also it is feasible.
Preferably, more than modulating frequency 1kHz, more preferably between 10kHz to 100kHz.
It is to say, the frequency of modulated signal (the namely frequency of light-emitting unit) is preferably in range above.
Visible, circuit itself produce inevitable noise frequency distribution as shown in figure 14, the noise width of lower frequency
Degree is relatively big, but raises with frequency and reduce, and the noise amplitude of upper frequency is less, and is distributed with frequency-flat, and it is referred to as " white
Noise ".Above modulating frequency belongs to the frequency range of white noise, the bigger noise of the most low-frequency amplitude can when demodulation quilt
Remove, and in white noise, the noise proportion conforming exactly to modulating frequency is the least, therefore the white noise of the overwhelming majority also can be in demodulation
Time be removed；Therefore, when using above modulating frequency to be modulated demodulation, the overwhelming majority that circuit self can be produced
Noise all removes, and improves the signal to noise ratio of signal after demodulating further.
The present embodiment also provides for a kind of display device, and it includes above-mentioned fingerprint recognition structure.
It is to say, above fingerprint recognition structure can combine with display device, make display device have finger simultaneously
Stricture of vagina identification function.Wherein, each photosensitive unit 1 of fingerprint recognition structure can be evenly distributed in the display floater of display device, from
And can all realize fingerprint recognition in each position of display floater, certainly, its most also can realize touch controllable function (since distinguishable finger
Stricture of vagina, the most distinguishable where is it finger).
Concrete, each photosensitive unit 1 can be located in array base palte, and is positioned at the pixel periphery of display, such as, be located at
The position at black matrix place；Therefore, what photosensitive unit 1 was taked is incell form, with display and combine more preferably, be not required to arrange
Individually touch base plate, and do not result in transmitance reduction etc..
Meanwhile, as it is shown in figure 9, the photosensitive unit 1 of same column can be connected by transistor T and read line Read respectively,
And the grid of the transistor T corresponding with photosensitive unit 1 of going together can connect same control line (as used gate lines G ate), therefore respectively
Photosensitive unit 1 can export induced signal according to " scanning " mode similar with when showing, thus reduces the number wherein gone between
Amount.Accordingly, due to same column photosensitive unit 1 be in turn output induced signal, as long as therefore in the end of every read line Read
Current/voltage converting unit, demodulating unit are set, are connected then at fingerprint recognition chip afterwards, thus display device can be reduced
In device and number of leads, simplify product structure, reduce product cost.
Preferably, as a kind of mode of the present embodiment, display device includes: display panels, display panels
Including multiple pixels, and photosensitive unit 1 is located in display panels；The backlight list being located at outside display panels incidence surface
Unit, back light unit is luminescence unit；Modulated signal generation unit is connected with back light unit, and drives by its modulated signal produced
Back light unit is luminous.
It is to say, display device is preferably liquid crystal indicator, owing to the light of liquid crystal indicator is from back light unit,
Therefore can directly with back light unit as above luminescence unit, and the modulated signal produced with modulated signal generation unit is directly driven
Dynamic back light unit is according to modulating frequency flashing.Such as, pwm circuit (pulse width modulation circuit) can be used as modulation letter
Number generation unit, and power for back light unit with it, then backlight can be according to the pulse signal flashing of pwm circuit output.
And, above photosensitive unit 1 is integrated in display panels, and display panels is provided with electrode,
The structure of many displays such as lead-in wire, the reflection of light all can be impacted by these structures.Therefore, if existing photosensitive unit 1 sets
In display panels, the most often produce bigger noise, it is difficult to the actual fingerprint recognition that realizes, therefore existing photosensitive unit 1
Typically to be located on single touch base plate.And according to the scheme of the present embodiment, noise can be greatly reduced by modulation /demodulation, from
And make the possibility that is integrated into of photosensitive unit 1 and display panels, simplify the structure of display device.
Preferably, photosensitive unit 1 is located at the interval of neighbor.
Wherein, pixel refers to be actually sent out the region of the light of display, is typically provided black matrix therebetween.For avoiding photosensitive list
Unit 1 impact display, therefore it is preferably located at the interval of neighbor.Certainly, when photosensitive unit 1 is located at pixel separation, should
Ensure that black matrix does not interferes with it and receives reflection light and (such as remove the black matrix of photosensitive unit 1 position, or by photosensitive unit 1
It is located at the black matrix side near exiting surface).
It is furthermore preferred that display panels includes that array base palte and color membrane substrates, photosensitive unit 1 are located at array base palte or coloured silk
In film substrate.
It is to say, display panels is usually by array base palte and color membrane substrates box, therefore photosensitive unit 1
May be provided on this array base palte or color membrane substrates.When photosensitive unit 1 is located on array base palte, its corresponding lead-in wire etc. can be with battle array
Other structures on row substrate together manufacture, therefore preparation simplicity；And when photosensitive unit 1 is located on color membrane substrates, its distance hands
Referring to relatively near, the light of finger reflection dissipates less, and its signal produced is more accurate.
Preferably, as the another way of the present embodiment, display device includes: multiple pixels, and each pixel includes sending out
Light unit and the drive circuit for the luminescence of driven for emitting lights unit, drive circuit includes switching device, and switching device will be for sending out
Other partially ON or cut-outs of light unit and drive circuit；Modulated signal generation unit is connected with switching device, and produces with it
Raw modulated signal controls the on or off of switching device.
It is to say, display device is alternatively the form that each pixel is directly luminous, and pixel includes the luminous organ that energy is luminous
Part (i.e. luminescence unit) and for driving the drive circuit of this luminescence unit.Meanwhile, it is provided with switching device in the driving circuit,
When switch device conductive, other parts in addition to switch element of drive circuit are connected with luminescence unit, can driven for emitting lights list
Unit is luminous；And when switching device turns off, other parts of drive circuit and luminescence unit disconnect, be equivalent to luminescence unit not with
Drive circuit connects, therefore the most luminous.Therefore, as long as controlling this derailing switch by the modulated signal of modulated signal generation unit generation
Part, can make luminescence unit (luminescent device) according to modulating frequency flashing.
Preferably, as the another way of the present embodiment, display device includes LED display panel, luminescence two
Pole pipe display floater includes multiple pixel, and photosensitive unit 1 is located in LED display panel.
It is to say, display device is alternatively light emitting display device, therefore wherein there is diode displaying face
Plate, accordingly, during now photosensitive unit 1 can be integrated in this LED display panel, to simplify the structure of display device.
It is furthermore preferred that photosensitive unit 1 is located at the interval of neighbor.
It is furthermore preferred that LED display panel includes array base palte and to box substrate, photosensitive unit 1 is located at array base
Plate or in box substrate.
It is to say, in LED display panel, photosensitive unit 1 is the most also located at the interval of pixel, and excellent
Choosing is also located in certain substrate.
It is furthermore preferred that each pixel of LED display panel includes light emitting diode and for driven for emitting lights two pole
The drive circuit that pipe is luminous, drive circuit includes the switching thin-film transistor directly connected with light emitting diode, and switch film is brilliant
Allow electric current to flow through light emitting diode during the conducting of body pipe, during shutoff, do not allow electric current to flow through light emitting diode；And modulated signal product
Raw unit is connected (including directly or indirectly connecting) with the grid of switching thin-film transistor.
It is to say, each pixel of LED display panel includes light emitting diode and drive circuit thereof, driving
In galvanic electricity road, also including the thin film transistor (TFT) directly connected with light emitting diode, it is referred to as switching thin-film transistor.Obviously, open
Electric current can be had to flow through light emitting diode when closing thin film transistor (TFT) conducting, the possible luminescence of light emitting diode (but be not inevitable luminescence, as
It also can show ater), when switching thin-film transistor turns off, then electric current can not flow through light emitting diode, and light emitting diode must
The most luminous.Thus, this switching thin-film transistor is whether to flow through light emitting diode for directly controlling electric current, in other words its
Whether directly control light emitting diode can be luminous.And, the grid of this switching thin-film transistor also with modulated signal generation unit,
Therefore the control of its switch modulated signal, therefore switching thin-film transistor is i.e. equivalent to above-mentioned switch element, and light-emitting diodes
Pipe is above-mentioned luminescence unit.
Concrete, the drive circuit of the pixel of a kind of light emitting display device and driver' s timing thereof such as Figure 10 and Figure 11
Shown in.This drive circuit is used for driven for emitting lights diode, and it specifically includes the first film transistor M1, the second thin film transistor (TFT)
M2, the 3rd thin film transistor (TFT) M3, the 4th thin film transistor (TFT) M4, the 5th thin film transistor (TFT) M5, the 6th thin film transistor (TFT) M6, Yi Ji electricity
Holding C, each structure in drive circuit is controlled by different signals respectively.Wherein, the 6th thin film transistor (TFT) M6 one end and luminous two
The anode of pole pipe is connected, and its grid is then connected with EM signal, therefore just can be as the above thin film transistor (TFT) (derailing switch that opens the light
Part), produce the structure of EM signal then for modulated signal generation unit.In the fingerprint recognition stage, as long as with EM signal for having
The modulated signal of modulating frequency, can make LED flash luminous.
Should be appreciated that the pixel of different rows proceeds by the time difference of display, therefore in their drive circuit
The signals such as Reset, Vgate are asynchronous；But typically, due to whole display device fingerprint recognition the to be simultaneously entered stage, because of
EM signal in the drive circuit of this different pixels should become modulated signal simultaneously.Wherein, the mode in fingerprint recognition stage is many
Sample, it can be to occur in turn according to predetermined way with the display stage, it is also possible to is to run specific program or carrying out specific
Occur during operation.
For realizing object above, can as shown in Figure 12,13 for the shift register and driver' s timing producing EM signal, its
In, multiple shift registers cascade, and each shift register provides EM signal for one-row pixels.Concrete, this shift register
Including the first transistor T1, transistor seconds T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th crystal
Pipe T6, neat transistor T7, the 8th transistor T8, the 9th transistor T9, the tenth transistor T10, the 11st transistor T11, with
And the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, each structure in shift register is connected from different signals respectively.
This shift register differs only in existing shift register, VGL and VGL-1 in existing shift register is same letter
Number, and two signal differences in the shift register of the present embodiment, be equivalent to add a lead-in wire and power for shift register.
Concrete, as shown in figure 13, in other stage in addition to the fingerprint recognition stage, VGL signal is the same with VGL-1 signal, is all low electricity
Flat；And when the fingerprint recognition stage to be entered, as long as making VGL-1 signal become the signal with modulating frequency, each picture can be made
EM signal in element all becomes the modulated signal with modulating frequency, and then makes each luminescence unit (light emitting diode) flash simultaneously
Luminous.Visible, it is now shift register and for producing the circuit (such as driving chip) of VGL-1 signal collectively as modulation letter
Number generation unit.
Certainly, the concrete form of above drive circuit, modulated signal generation unit etc. is all various, if drive circuit
In there is the switching device being controlled luminescence unit, and the control of this switching device energy modulated signal generation unit is i.e.
Can.
The light emitting diode related in this above-described embodiment can be OLED (Organic Light Emitting Diode) or QLED (amount
Sub-point luminescent diode).This light emitting diode, as pixel cell, is arranged in array for showing image.
The present embodiment also provides for a kind of fingerprint identification method, comprising:
Luminescence unit with modulating frequency flash luminous to finger, photosensitive unit 1 receives the luminescence unit reflected by finger
The light sent, and produce induced signal according to the intensity of the light received；
Induced signal is demodulated, judges that photosensitive unit 1 carries out fingerprint recognition according to the signal after demodulation.
It is to say, the luminescence (such as being controlled by modulated signal) that luminescence unit flashes according to modulating frequency can be made, and
Receive, with photosensitive unit 1, the light that finger reflects, the sensing letter afterwards photosensitive unit 1 produced when flashing
Number it is demodulated, carries out fingerprint recognition finally according to the signal after demodulation.Wherein, fingerprint recognition is carried out according to the signal after demodulation
Concrete grammar be not described in detail.
Certainly, this fingerprint identification method is preferably realized by above fingerprint recognition structure or display device.
It is understood that embodiment of above be merely to illustrate that principle of the present utility model and use exemplary
Embodiment, but this utility model is not limited thereto.For those skilled in the art, without departing from this
In the case of the spirit of utility model and essence, can make various modification and improvement, these modification and improvement are also considered as this reality
With novel protection domain.
Claims (13)
1. a fingerprint recognition structure, including:
Luminescence unit, for luminous to finger；
Photosensitive unit, is located at the position that can receive the light that the luminescence unit reflected by finger sends, for according to the light received
Intensity produce induced signal；
It is characterized in that, described fingerprint recognition structure also includes:
Modulated signal generation unit, for producing the modulated signal with modulating frequency, and controls described luminescence by modulated signal
Unit is with modulating frequency flashing；
Demodulating unit, is connected with described photosensitive unit, for being demodulated described induced signal.
Fingerprint recognition structure the most according to claim 1, it is characterised in that described demodulating unit includes:
Block isolating circuit, its input connects photosensitive unit；
Demodulator circuit, its input connects the outfan of block isolating circuit；
Low-pass filter circuit, its input connects the outfan of demodulator circuit.
Fingerprint recognition structure the most according to claim 1, it is characterised in that described photosensitive unit is for being used for producing faradism
The photosensitive unit of stream signal；Described fingerprint recognition structure also includes:
The current/voltage converting unit being connected between described photosensitive unit and demodulating unit.
Fingerprint recognition structure the most according to claim 1, it is characterised in that
Described modulated signal generation unit is also connected with described demodulating unit, for described modulated signal is delivered to demodulating unit
As demodulation carrier signal.
5. a display device, it is characterised in that including:
Fingerprint recognition structure described in any one in Claims 1-4.
Display device the most according to claim 5, it is characterised in that including:
Display panels, described display panels includes multiple pixel, and described photosensitive unit is located at display panels
In；
Being located at the back light unit outside described display panels incidence surface, described back light unit is described luminescence unit；
Described modulated signal generation unit is connected with back light unit, and drives described back light unit to send out by its modulated signal produced
Light.
Display device the most according to claim 6, it is characterised in that
Described photosensitive unit is located at the interval of neighbor.
Display device the most according to claim 6, it is characterised in that
Described display panels includes that array base palte and color membrane substrates, described photosensitive unit are located at described array base palte or color film
In substrate.
Display device the most according to claim 5, it is characterised in that including:
LED display panel, described LED display panel includes multiple pixel, and described photosensitive unit is located at
In LED display panel.
Display device the most according to claim 9, it is characterised in that
Each described pixel includes light emitting diode and the drive circuit for driven for emitting lights LED lighting, described drive circuit
Including the switching thin-film transistor directly connected with light emitting diode, during the conducting of described switching thin-film transistor, electric current is allowed to flow through
Described light emitting diode, does not allow electric current to flow through described light emitting diode during shutoff；
Described modulated signal generation unit is connected with the grid of switching thin-film transistor.
11. display devices according to claim 9, it is characterised in that
Described photosensitive unit is located at the interval of neighbor.
12. display devices according to claim 9, it is characterised in that
Described LED display panel includes array base palte and to box substrate, and described photosensitive unit is located at described array base palte
Or in box substrate.
13. display devices according to claim 5, it is characterised in that including:
Multiple pixels, each pixel includes described luminescence unit and for the luminous drive circuit of driven for emitting lights unit, described in drive
Galvanic electricity road includes switching device, and described switching device is for other the partially ON or cut-outs by luminescence unit with drive circuit；
Described modulated signal generation unit is connected with switching device, and controls described switching device by its modulated signal produced
On or off.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620519770.1U CN205750817U (en) | 2016-05-31 | 2016-05-31 | Fingerprint recognition structure, display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620519770.1U CN205750817U (en) | 2016-05-31 | 2016-05-31 | Fingerprint recognition structure, display device |
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| CN205750817U true CN205750817U (en) | 2016-11-30 |
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| CN201620519770.1U Active CN205750817U (en) | 2016-05-31 | 2016-05-31 | Fingerprint recognition structure, display device |
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| CN105893992A (en) * | 2016-05-31 | 2016-08-24 | 京东方科技集团股份有限公司 | Fingerprint identification structure and method and display device |
| CN106874866A (en) * | 2017-02-13 | 2017-06-20 | 京东方科技集团股份有限公司 | Display device and its control method |
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| CN108171179A (en) * | 2017-12-30 | 2018-06-15 | 深圳信炜科技有限公司 | Photosensitive circuit, photosensitive device and electronic equipment |
| WO2019007047A1 (en) * | 2017-07-04 | 2019-01-10 | 京东方科技集团股份有限公司 | Display panel, display device and method for manufacturing display panel |
| CN109325384A (en) * | 2017-07-31 | 2019-02-12 | 敦泰电子有限公司 | Cell type optical identification of fingerprint shows equipment |
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| CN105893992A (en) * | 2016-05-31 | 2016-08-24 | 京东方科技集团股份有限公司 | Fingerprint identification structure and method and display device |
| WO2017206598A1 (en) * | 2016-05-31 | 2017-12-07 | 京东方科技集团股份有限公司 | Fingerprint identification assembly, display device, and fingerprint identification method |
| CN106874866A (en) * | 2017-02-13 | 2017-06-20 | 京东方科技集团股份有限公司 | Display device and its control method |
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| CN107220622A (en) * | 2017-05-27 | 2017-09-29 | 北京小米移动软件有限公司 | Organic light-emitting diode display module and its control method |
| WO2019007047A1 (en) * | 2017-07-04 | 2019-01-10 | 京东方科技集团股份有限公司 | Display panel, display device and method for manufacturing display panel |
| US10866447B2 (en) | 2017-07-04 | 2020-12-15 | Boe Technology Group Co., Ltd. | Display panel, display apparatus, and method for manufacturing a display panel |
| CN109325384A (en) * | 2017-07-31 | 2019-02-12 | 敦泰电子有限公司 | Cell type optical identification of fingerprint shows equipment |
| CN109325384B (en) * | 2017-07-31 | 2022-05-13 | 敦泰电子有限公司 | Embedded optical fingerprint identification display equipment |
| CN108171179A (en) * | 2017-12-30 | 2018-06-15 | 深圳信炜科技有限公司 | Photosensitive circuit, photosensitive device and electronic equipment |
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