CN108256507B - Fingerprint identification device and touch panel - Google Patents
Fingerprint identification device and touch panel Download PDFInfo
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- CN108256507B CN108256507B CN201810155281.6A CN201810155281A CN108256507B CN 108256507 B CN108256507 B CN 108256507B CN 201810155281 A CN201810155281 A CN 201810155281A CN 108256507 B CN108256507 B CN 108256507B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
Abstract
The invention provides a fingerprint identification device and a touch panel.A backlight modulation module is added in the fingerprint identification device, and can receive modulated light emitted by a backlight module, generate a demodulation signal with the same phase as the modulated light and transmit the demodulation signal to a demodulation circuit of the fingerprint identification device; the backlight modulation module and the fingerprint identification module have the same light source, so that the time delay required by the generation of photocurrent by the fingerprint identification module is eliminated, and a current signal consistent with that of the fingerprint identification module is obtained; the frequency and the phase of the demodulation signal generated by the backlight modulation module and the frequency and the phase of the modulation signal received by the fingerprint identification module are the same, so that the phase offset is eliminated, and the signal quantity and the signal to noise ratio are improved. In addition, the backlight module does not need to be directly connected with the display module, physical and electrical isolation is achieved, and noise coupled from the backlight module is reduced, so that detection precision is improved, and the signal to noise ratio is further improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a fingerprint identification device and a touch panel.
Background
The fingerprint identification technology has the advantages of high precision, high speed, low price, high user acceptance and the like, so that the full attention of academic circles is paid since the field is pioneered, and many colleges and scientific research institutions at home and abroad are added into the research field at a glance to obtain a series of achievements.
The existing fingerprint identification technology adopts backlight modulation to detect fingerprints, the principle is shown in figure 1, a modulator 1 enables a backlight module 2 to generate modulated light with specific frequency, the modulated light is used for irradiating a photosensitive sensor 31 in a fingerprint identification module 3, then full-wave phase-sensitive demodulation is carried out on the photosensitive sensor, and weak signals of valleys and ridges of the fingers are recovered from noise. The demodulation circuit of the fingerprint identification module 3 is located on the display module, the modulator 1 is directly electrically connected with the backlight module 2, in the modulation and demodulation process, the modulator 1 directly transmits square waves with the same frequency as modulated light to the demodulation circuit, and the phase of a demodulation signal and a modulation signal shifts, so that the final signal quantity is reduced, and the signal to noise ratio is reduced. In addition, the demodulation signal is from the backlight module 2, so the noise on the backlight module 2 will also couple to the fingerprint signal, reducing the detection accuracy and further reducing the signal-to-noise ratio.
Therefore, a fingerprint identification device and a touch panel are needed to solve the above technical problems.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, the present invention provides a fingerprint identification device and a touch panel, which are used to at least partially solve the problems of low detection accuracy and low signal-to-noise ratio.
In order to solve the technical problems, the invention adopts the following technical scheme:
the present invention provides a fingerprint identification device, comprising: the backlight module comprises a modulator, a backlight module and a fingerprint identification module, wherein the modulator is connected with the backlight module so as to enable the backlight module to generate modulated light, and the fingerprint identification module can receive the modulated light; the fingerprint identification device further comprises a backlight modulation module, wherein the backlight modulation module is connected with a demodulation circuit in the fingerprint identification module and used for receiving the modulated light, generating a demodulation signal with the same phase as the modulated light and transmitting the demodulation signal to the demodulation circuit.
Further, the fingerprint identification module further comprises: the first photosensitive sensor, the first current-voltage conversion circuit for converting the modulated light signal into a square wave signal and the first filter circuit for amplifying and shaping the square wave signal are sequentially connected, and the first filter circuit is connected with the demodulation circuit;
the backlight modulation module comprises: the second photosensitive sensor, the second current-voltage conversion circuit for converting the modulated light signal into a square wave signal, and the second filter circuit for amplifying and shaping the square wave signal are connected in sequence, and the second filter circuit is connected with the demodulation circuit.
Preferably, the first and second photosensors are of the same type.
Furthermore, the backlight modulation module further comprises a phase compensation module, and the second filter circuit is connected with the phase compensation module and connected with the demodulation circuit through the phase compensation module.
Preferably, the fingerprint identification device is applied to a touch panel, and the backlight modulation module is located in a peripheral area of the touch panel.
Preferably, the area of the second photosensor is greater than or equal to the area of the first photosensor.
Preferably, the first photosensor includes a photosensitive unit including a diode, a transistor, or a photo resistor.
Further, the first photosensitive sensor further includes a thin film transistor, the thin film transistor includes a first pole, a control pole connected to a scan line of the touch panel, and a second pole connected to a data read line of the touch panel, and the first pole is connected to the photosensitive unit.
Preferably, the fingerprint identification devices are applied to a touch panel, the number of fingerprint identification modules is multiple, and the first photosensitive sensors of the fingerprint identification devices are arranged in a matrix;
each first photosensitive sensor is located in a peripheral area of the touch panel, or in an area where a black matrix of the touch panel is located.
The invention also provides a touch panel comprising the fingerprint identification device.
The invention can realize the following beneficial effects:
according to the fingerprint identification device, the backlight modulation module is added in the fingerprint identification device, and can receive modulated light emitted by the backlight module, generate a demodulation signal with the same phase as the modulated light, and transmit the demodulation signal to a demodulation circuit of the fingerprint identification device; because the fingerprint identification module and the backlight modulation module both receive modulated light emitted by the backlight module, namely the backlight modulation module and the fingerprint identification module have the same light source, the time delay required by the photocurrent generated by the fingerprint identification module is eliminated, a current signal consistent with the fingerprint identification module is obtained, and the problem that the fingerprint signal (namely the modulated signal) and the demodulated signal cannot be completely synchronous is solved; the frequency and the phase of the demodulation signal generated by the backlight modulation module and the frequency and the phase of the modulation signal received by the fingerprint identification module are the same, so that the phase offset is eliminated, and the signal quantity and the signal to noise ratio are improved. In addition, backlight unit need not to link to each other with the display module assembly directly, has realized physics and electric isolation, is favorable to reducing the noise that couples from backlight unit to improve and detect the precision and further improve the SNR, can realize backlight unit and display module group separation moreover, strengthened the independence of module.
Drawings
FIG. 1 is a schematic diagram of a prior art fingerprint identification device;
FIG. 2 is a schematic structural diagram of a fingerprint identification device provided by the present invention;
FIG. 3 is a schematic structural diagram of a first photosensitive sensor provided by the present invention;
FIG. 4 is a schematic view of a first exemplary photosensor arrangement according to the present invention;
FIG. 5 is a second schematic view of a first photosensor arrangement according to the present invention;
fig. 6 is a schematic structural diagram of a touch panel including the first photosensitive sensor shown in fig. 5 according to the present invention.
Illustration of the drawings:
1. modulator 2, backlight module 3, fingerprint identification module
4. Backlight demodulation module 5, array substrate 6 and liquid crystal layer
7. Color film substrate 8, first polarizer 9 and second polarizer
10. Cover plate 31, first photosensor 34, demodulation circuit
33. First filter circuit 32 and first current-voltage conversion circuit
41. Second photosensor 42, second current-to-voltage conversion circuit
43. Second filter circuit 44 and phase compensation module
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The inventor finds that in the existing fingerprint identification scheme, the phase of the demodulation signal and the modulation signal is shifted for two reasons: one reason is that the photo-sensor in the fingerprint recognition module needs a certain time delay to generate the photo-current after being irradiated by light; another reason is that there is a delay in this process because the modulated light needs to pass through the display module to reach the finger and then be received by the light-sensitive sensor in the fingerprint recognition module. Both of these two causes add up, which causes the phase of the demodulated signal to be shifted from that of the modulated signal, resulting in a reduced signal-to-noise ratio.
The present invention provides a fingerprint recognition device, as shown in fig. 2, the fingerprint recognition device including: modulator 1, backlight unit 2 and fingerprint identification module 3, modulator 1 links to each other with backlight unit 2 to make backlight unit 2 produce the modulation light, fingerprint identification module 3 can receive the modulation light. The fingerprint identification device further comprises a backlight modulation module 4, wherein the backlight modulation module 4 is connected with a demodulation circuit 34 in the fingerprint identification module 3, and is used for receiving the modulated light, generating a demodulation signal with the same phase as the modulated light, and transmitting the demodulation signal to the demodulation circuit 34.
According to the fingerprint identification device, the backlight modulation module 4 is added in the fingerprint identification device, the backlight modulation module 4 can receive modulated light emitted by the backlight module 2, generate a demodulation signal with the same phase as the modulated light, and transmit the demodulation signal to the demodulation circuit 34 of the fingerprint identification device; because the fingerprint identification module 3 and the backlight modulation module 4 both receive the modulated light emitted by the backlight module 2, that is, the backlight modulation module 4 and the fingerprint identification module 3 have the same light source, the time delay required by the photocurrent generated by the fingerprint identification module 3 can be eliminated, a current signal consistent with that of the fingerprint identification module 3 is obtained, and the problem that the fingerprint signal (i.e., the modulated signal) and the demodulated signal cannot be completely synchronous is solved; the frequency and the phase of the demodulation signal generated by the backlight modulation module 4 are the same as those of the modulation signal received by the fingerprint identification module 3, so that the phase offset is eliminated, and the signal quantity and the signal-to-noise ratio are improved. In addition, backlight unit 2 need not to link to each other with display module 2 is direct, has realized physics and electric isolation, is favorable to reducing the noise that couples from backlight unit 2 to improve and detect the precision and further improve the SNR, can realize backlight unit 2 and display module separation moreover, strengthened the independence of module.
As shown in fig. 2, the fingerprint recognition module 3 further includes: a first photosensor 31, a first current-to-voltage conversion circuit 32 for converting the modulated light signal into a square wave signal, and a first filter circuit 33 for amplifying and shaping the square wave signal, the first filter circuit 33 being connected to a demodulation circuit 34.
Accordingly, the backlight modulation module 4 includes: the second photosensitive sensor 41, the second current-voltage conversion circuit 42 for converting the modulated light signal into a square wave signal, and the second filter circuit 43 for amplifying and shaping the square wave signal are connected in sequence, and the second filter circuit 43 is connected with the demodulation circuit 34 of the fingerprint identification module 3.
Therefore, the structure and the composition of the backlight modulation module 4 and the demodulation circuit 34 in the fingerprint identification module 3 are completely the same, so that the phase of the demodulation signal generated by the backlight modulation module 4 is the same as the phase of the current signal generated by the fingerprint identification module 3, and the phase offset is eliminated.
Preferably, the first photosensor 31 and the second photosensor 41 are of the same type, so that the first photosensor 31 and the second photosensor 41 have the same photoelectric conversion time, and thus the frequency and phase of the square wave signal obtained by the second photosensor 41 and the fingerprint photosensor signal are theoretically the same, thereby eliminating phase difference and improving the signal quantity and detection accuracy.
Preferably, the first filter circuit 33 and the second filter circuit 43 may use comparators, which can shape the smooth waveform into a regular square waveform and amplify the waveform signal.
Further, as shown in fig. 3, the fingerprint identification module 3 further includes a third filter circuit 35 and an AD module 36, and the third filter circuit 35 is connected to the demodulation circuit 34 and the AD module 36, respectively.
In the fingerprint identification process, since the modulated light needs to be received by the first photosensitive sensor 31 in the fingerprint identification module 3 after reaching the finger through the display module, there is also a delay in the process. In order to further eliminate the delay and ensure the synchronization between the demodulated signal and the modulated signal, as shown in fig. 2, the backlight modulation module 4 may further include a phase compensation module 44, and the second filter circuit 43 is connected to the phase compensation module 44 and connected to the demodulation circuit 34 through the phase compensation module 44.
The phase compensation module 44 may compensate the phase of the demodulated signal by adjusting a capacitance or impedance value in the circuit, typically the phase compensation may range from 1-1.5 °.
By using the phase compensation module 44, delay generated in the process that the modulated light is reflected by the finger and then received by the fingerprint identification module 3 can be eliminated, and the signal quantity and the signal to noise ratio can be further improved.
As shown in fig. 4, 5 and 6, the fingerprint identification device may be applied to a touch panel, and the backlight modulation module 4 is located in a peripheral area of the touch panel, so that an area of the second photosensitive sensor 41 in the backlight module 4 may be made larger without affecting transmittance of the touch panel.
The area of the second photosensor 41 may be greater than or equal to the area of the first photosensor 31. Preferably, the area of the second photosensor 41 may be n times the area of the first photosensor 31, where n is a positive integer.
By increasing the area of the second photosensor 41, the demodulated signal can be detected more easily, thereby improving the detection accuracy.
The specific structure of the first photosensor 31 will be described in detail below with reference to fig. 3, 4, and 5. As shown in fig. 3, the first photosensor 31 includes a photosensitive unit 311, and the photosensitive unit 311 may be a diode, a transistor, or a photo resistor. The first photosensor 31 may further include a Thin Film Transistor (TFT) 312, where the TFT 312 includes a control electrode, a first electrode and a second electrode, the control electrode is connected to a scan line Gate line of the touch panel, the first electrode is connected to the photosensor 311, and the second electrode is connected to a Data read line Data line of the touch panel. One of the first pole and the second pole is a source electrode, and the other is a drain electrode.
As shown in fig. 3, the first photosensor 31 may further include a direct current power supply (DC)313, and the DC power supply 313 is connected to the photosensor 311 for applying a bias voltage Vd to the photosensor 311.
It should be noted that the first photosensor 31 may not include the tft 312, but only include the photosensor 311 and the dc power supply 313, but such a structure requires more leads and support of the detection circuit.
The structure of the second photosensor 41 is the same as that of the first photosensor 31, and will not be described in detail. The specific structure of the first photosensor 31 and the second photosensor 41 is not limited to the above structure, and the embodiment of the present invention is only exemplary, and the structure of the first photosensor 31 and the second photosensor 41 is not limited.
As shown in fig. 4 and 5, when the fingerprint identification device is applied to a touch panel, one backlight demodulation module 4 is provided, a plurality of fingerprint identification modules 3 are provided, and the first photosensitive sensors 31 of the fingerprint identification modules 3 are arranged in a matrix. Typically, the array of first photosensors 31 is several hundred by several hundred in size.
As shown in fig. 4, the backlight demodulation module 4 and the first photosensitive sensor 31 in each fingerprint identification module 3 are located in the peripheral area of the touch panel. The first photosensor 31 scans the Gate line by line in a line scanning manner, when the Gate line scans a certain line, the thin film transistor of the line is turned on, and then the controller (IC) collects a fingerprint signal through the Data reading line. When all the lines are scanned, complete fingerprint data of one frame can be obtained, and the pattern of the fingerprint can be obtained through the back-end processing of the controller.
As shown in fig. 5, the backlight demodulation module 4 is located in the peripheral area of the touch panel, and the first photosensitive sensor 31 in the fingerprint identification module 3 is located in the area of the black matrix of the touch panel. That is, the number of the first photosensors 31 is the same as the number of the pixel units of the touch panel, and the first photosensors 31 are respectively distributed in the pixel units, but are not located in the opening areas of the pixel units, but are located in the areas where the black matrixes are located, so as to avoid affecting the pixel opening ratio.
The arrangement mode of the first photosensitive sensor 31 shown in fig. 5 is an optimal scheme, so that fingerprint identification can be performed in the display area of the touch panel, even full-screen fingerprint identification is realized, and user experience is greatly enhanced. Moreover, the first photosensor 31 is located in the black matrix area of the touch panel display area, which neither affects the display nor reduces the aperture ratio. In the scheme, fingerprint signal detection can be performed independently with display without mutual influence.
It should be noted that, no matter the position of the first photosensor 31 shown in fig. 4 or the position of the first photosensor 31 shown in fig. 5, the number of the first current-voltage converting circuits 32, the first filter circuits 33, the demodulating circuits 34, the third filter circuits 35, and the AD modules 36 is also plural, and is the same as the number of the first photosensors 31, and each of the first current-voltage converting circuits 32, the first filter circuits 33, the demodulating circuits 34, the third filter circuits 35, and the AD modules 36 is located in the peripheral area of the touch panel.
The invention also provides a touch panel, which comprises the fingerprint identification device. The structure of the touch panel will be described in detail below by taking the position distribution of the first photosensors 31 shown in fig. 5 as an example.
As shown in fig. 6, the touch panel is a liquid crystal touch panel, and includes an array substrate 5, a color filter substrate 7, and a liquid crystal layer 6 located between the array substrate 5 and the color filter substrate 7. The backlight module 2 is arranged on one side, away from the liquid crystal layer 6, of the array substrate 5, the first polarizer 8 is arranged between the array substrate 5 and the backlight module 2, and the second polarizer 9 and the cover plate 10 are sequentially arranged on one side, away from the liquid crystal layer 6, of the color film substrate 7.
The first photosensor 31 and the second photosensor 41 are located on the array substrate 5 on a side adjacent to the liquid crystal layer 6, wherein the first photosensor 31 is located in a region corresponding to a black matrix in a display region of the touch panel, and the second photosensor 41 is located in a peripheral region of the touch panel.
The LED lamp in the backlight module 2 emits backlight, and a part of the backlight is reflected to the second photosensor 41 after reaching the non-light-transmitting area of the cover plate 10 through the display module, so as to obtain a demodulation signal, and the demodulation signal is transmitted to the demodulation circuit 34 of the fingerprint identification module 3. The other part of the backlight enters the valley or ridge of the finger through the display module and then is reflected to the first photosensitive sensor 31 of the array substrate 5, after the first photosensitive sensor 31 receives the backlight, the backlight is converted into corresponding current by the first current-voltage conversion circuit 32, and finally the current is processed into a recognizable digital signal through the rear end to compare the difference between the valley and the ridge, so that fingerprint identification is realized.
It should be noted that the touch panel of the present invention is not limited to the liquid crystal display panel, and may also be an AMOLED (Active-matrix organic light emitting diode) display panel.
According to the touch panel provided by the invention, the backlight modulation module 4 is additionally arranged in the fingerprint identification device, the backlight modulation module 4 can receive modulated light emitted by the backlight module 2, generate a demodulation signal with the same phase as the modulated light, and transmit the demodulation signal to the demodulation circuit 34 of the fingerprint identification device; because the fingerprint identification module 3 and the backlight modulation module 4 both receive the modulated light emitted by the backlight module 2, that is, the backlight modulation module 4 and the fingerprint identification module 3 have the same light source, the time delay required by the photocurrent generated by the fingerprint identification module 3 can be eliminated, a current signal consistent with that of the fingerprint identification module 3 is obtained, and the problem that the fingerprint signal (i.e., the modulated signal) and the demodulated signal cannot be completely synchronous is solved; the frequency and the phase of the demodulation signal generated by the backlight modulation module 4 are the same as those of the modulation signal received by the fingerprint identification module 3, so that the phase offset is eliminated, and the signal quantity and the signal-to-noise ratio are improved. In addition, backlight unit 2 need not to link to each other with display module 2 is direct, has realized physics and electric isolation, is favorable to reducing the noise that couples from backlight unit 2 to improve and detect the precision and further improve the SNR, can realize backlight unit 2 and display module separation moreover, strengthened the independence of module.
The invention modulates the light source and then effectively extracts the valley and ridge signals of the fingerprint, can effectively inhibit the environmental noise, improves the signal-to-noise ratio and is more beneficial to the acquisition of the fingerprint signals by the processor. By providing a fingerprint identification module, an independent or in-display fingerprint identification scheme may be implemented. Because glass-based fingerprint identification has a cost advantage compared with silicon-based nature, and the fingerprint identification module is integrated into the display area, the user experience can be increased, and the cost can be continuously reduced, so that the ultrahigh added value of the product is realized.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A fingerprint identification device comprising: the backlight module comprises a modulator, a backlight module and a fingerprint identification module, wherein the modulator is connected with the backlight module so as to enable the backlight module to generate modulated light, and the fingerprint identification module can receive the modulated light; it is characterized in that the preparation method is characterized in that,
the fingerprint identification device also comprises a backlight modulation module, wherein the backlight modulation module is connected with a demodulation circuit in the fingerprint identification module and is used for receiving the modulated light, generating a demodulation signal with the same phase as the modulated light and transmitting the demodulation signal to the demodulation circuit;
the fingerprint identification module further comprises: the first photosensitive sensor, the first current-voltage conversion circuit for converting the modulated light signal into a square wave signal and the first filter circuit for amplifying and shaping the square wave signal are sequentially connected, and the first filter circuit is connected with the demodulation circuit;
the backlight modulation module comprises: the second photosensitive sensor, the second current-voltage conversion circuit for converting the modulated light signal into a square wave signal, and the second filter circuit for amplifying and shaping the square wave signal are connected in sequence, and the second filter circuit is connected with the demodulation circuit.
2. The fingerprint recognition device of claim 1, wherein said first photosensitive sensor and said second photosensitive sensor are of the same type.
3. The fingerprint recognition device of claim 1, wherein the backlight modulation module further comprises a phase compensation module, and wherein the second filter circuit is coupled to the phase compensation module and to the demodulation circuit via the phase compensation module.
4. The fingerprint recognition device of claim 1, wherein the fingerprint recognition device is applied to a touch panel, and the backlight modulation module is located in a peripheral area of the touch panel.
5. The fingerprint recognition device of claim 4, wherein an area of the second photosensitive sensor is greater than or equal to an area of the first photosensitive sensor.
6. The fingerprint recognition device of claim 1, wherein said first photosensor comprises a photosensitive cell comprising a diode, a transistor, or a photoresistor.
7. The fingerprint recognition device of claim 6, wherein said first photosensor further comprises a thin film transistor, said thin film transistor comprising a first pole, a control pole for connection to a scan line of a touch panel, and a second pole for connection to a data read line of said touch panel, said first pole being connected to said photosensitive cell.
8. The fingerprint recognition device according to any one of claims 1 to 7, wherein the fingerprint recognition device is applied to a touch panel, the number of fingerprint recognition modules is plural, and the first photosensitive sensor of each fingerprint recognition device is arranged in a matrix;
each first photosensitive sensor is located in a peripheral area of the touch panel, or in an area where a black matrix of the touch panel is located.
9. A touch panel comprising the fingerprint recognition device according to any one of claims 1 to 8.
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