CN109983472B

CN109983472B - Fingerprint identification device and electronic equipment

Info

Publication number: CN109983472B
Application number: CN201980000270.3A
Authority: CN
Inventors: 谢浩
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-02-22
Filing date: 2019-02-22
Publication date: 2021-05-11
Anticipated expiration: 2039-02-22
Also published as: CN109983472A; WO2020168540A1

Abstract

A fingerprint identification device and an electronic device can improve the quality of a fingerprint detection signal. The fingerprint identification device includes: the fingerprint identification module is arranged below the display screen and used for receiving the optical signals reflected by the finger and converting the optical signals into electric signals; the light signal comprises a first flashing light signal that first flashing light of the supplementary lighting source is reflected by the finger.

Description

Fingerprint identification device and electronic equipment

Technical Field

The present application relates to the field of optical fingerprint technology, and more particularly, to a fingerprint identification device and an electronic apparatus.

Background

With the rapid development of the information industry, the under-screen biometric identification technology is applied more and more widely, wherein the under-screen fingerprint identification technology is widely applied to a plurality of fields such as mobile terminals and smart homes.

Currently, the display screens in the market include Liquid Crystal Displays (LCD) and organic light-emitting diode (OLED) display screens. The technology of optical fingerprint identification under the OLED screen is to detect fingerprints after the OLED display screen irradiates a finger with light emitted by the OLED display screen, and the quality improvement of a fingerprint detection signal is limited by the maximum brightness which can be provided by the OLED display screen.

Therefore, how to improve the quality of the fingerprint detection signal under the OLED screen becomes a technical problem to be solved urgently.

Disclosure of Invention

The embodiment of the application provides a fingerprint identification device and electronic equipment, and the quality of a fingerprint detection signal under an OLED screen can be improved, so that the performance of the fingerprint identification device is improved.

In a first aspect, a fingerprint identification device is provided, which includes: the fingerprint identification module is arranged below the display screen and used for receiving the optical signals reflected by the finger and converting the optical signals into electric signals; the light signal comprises a first flashing light signal that first flashing light of the supplementary lighting source is reflected by the finger.

Based on above-mentioned technical scheme, make fingerprint detection light signal's light intensity no longer be limited by OLED display screen's light source light intensity itself through increasing the light filling light source, increase fingerprint detection light signal's light intensity. And the light supplementing light source emits first flashing light which is different from ambient light, so that the interference of the ambient light is avoided, the quality of a fingerprint detection signal is improved, and fingerprint detection can be carried out under strong light.

In a possible implementation manner, the apparatus further includes the supplementary light source, and the supplementary light source is configured to generate the first scintillation light.

Optionally, the supplementary lighting light source is disposed outside the field of view of the fingerprint identification module.

In a possible implementation manner, the light supplement light source is a hollow area light source, and the field of view of the fingerprint identification module is located in a hollow area of the hollow area light source.

Optionally, the hollow surface light source includes: hollow circular area light source, hollow rectangular area light source or hollow hexagonal area light source.

Optionally, the fingerprint identification module is disposed below the center of the hollow area light source.

In a possible implementation manner, the supplementary light source is an infrared light emitting source.

In a possible implementation manner, the fingerprint identification module is configured to generate a first control signal, and the first control signal controls a switching frequency and/or a switching time of the fill-in light source to emit the first flickering light.

Optionally, the first control signal includes a first modulation control signal, and the first modulation control signal controls a switching frequency and/or a switching time of the fill-in light source to change with time.

In a possible implementation manner, the fingerprint identification module is configured to process the electrical signal to obtain a first fingerprint detection signal; the first fingerprint detection signal is an electrical signal based on the first flickering light signal.

Optionally, the fingerprint identification module is configured to demodulate the electrical signal to obtain the first fingerprint detection signal.

In one possible implementation, the light signal includes a second flickering light signal of a second flickering light of the display screen reflected by the finger.

In a possible implementation manner, the fingerprint identification module is configured to generate a second control signal, and the second control signal controls a switching frequency and/or a switching time of a pixel unit in the display screen to emit the second scintillation light.

Optionally, the second control signal includes a second modulation control signal, and the second modulation control signal controls a switching frequency and/or a switching time of a pixel unit in the display screen to change with time.

In a possible implementation manner, the fingerprint identification module is configured to process the electrical signal to obtain a second fingerprint detection signal; the second fringe detection signal is an electrical signal based on the first scintillation light signal and the second scintillation light signal.

Optionally, the fingerprint identification module is configured to demodulate the electrical signal to obtain the second fingerprint detection signal.

In one possible implementation, the apparatus further includes: and the processor is used for generating a first control signal, and the first control signal controls the switching frequency and/or the switching time of the light supplementing light source so as to emit the first scintillation light.

In a possible implementation manner, the processor is configured to process the electrical signal to obtain a first fingerprint detection signal; the first fingerprint detection signal is an electrical signal based on the first flickering light signal.

Optionally, the processor is configured to demodulate the electrical signal to obtain the fingerprint detection signal.

In one possible implementation, the processor is configured to generate a second control signal, and the second control signal controls a switching frequency and/or a switching time of a pixel unit in the display screen to emit the second scintillation light.

In a possible implementation manner, the processor is configured to process the electrical signal to obtain a second fingerprint detection signal; the second fringe detection signal is an electrical signal based on the first scintillation light signal and the second scintillation light signal.

Optionally, the processor is configured to demodulate the electrical signal to obtain the second fingerprint detection signal.

In a possible implementation manner, the processor is configured to receive first indication information, where the first indication information indicates that the finger touch exists on the display screen, and turn on the light supplement light source according to the first indication information.

In a possible implementation manner, the processor is configured to receive second indication information, where the second indication information indicates that there is ambient light with intensity exceeding a first threshold, and turn on the light supplement light source according to the second indication information and the first indication information.

In a second aspect, there is provided an electronic device comprising a display screen and a fingerprint recognition apparatus as in the first aspect or any one of its possible implementations.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device to which the embodiment of the present application is applied.

Fig. 2 is a schematic structural diagram of a fingerprint identification device and a terminal device to which the fingerprint identification device is applied according to an embodiment of the present application.

Fig. 3 is a schematic shape diagram of a fill-in light source according to an embodiment of the present application.

Fig. 4 is a schematic functional block diagram of a fingerprint identification device according to an embodiment of the present application.

FIG. 5 is a schematic functional block diagram of another fingerprint identification device of an embodiment of the present application.

FIG. 6 is a schematic functional block diagram of another fingerprint identification device of an embodiment of the present application.

FIG. 7 is a schematic functional block diagram of another fingerprint identification device of an embodiment of the present application.

FIG. 8 is a schematic functional block diagram of another fingerprint identification device of an embodiment of the present application.

Fig. 9 is a schematic flow chart of another fingerprint identification method according to an embodiment of the present application.

FIG. 10 is a schematic functional block diagram of another fingerprint identification device of an embodiment of the present application.

Fig. 11 is a flowchart illustrating a fingerprint identification method according to an embodiment of the present application.

FIG. 12 is a schematic block diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

As a common application scenario, the technical scheme of the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other terminal devices with display screens. The technical scheme of the embodiment of the application can be used for the biological feature recognition technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, and living body recognition. For convenience of explanation, the fingerprint identification technology is described as an example below.

In the terminal device, the optical fingerprint system of the embodiment of the present application includes an optical fingerprint device, and the optical fingerprint device may be disposed in a partial area or an entire area below the display screen, so as to form an Under-screen (Under display) optical fingerprint system.

Fig. 1 is a schematic structural diagram of a terminal device 10 to which the embodiment of the present application is applicable, where the terminal device 10 includes a display screen 120 and a fingerprint identification module 110, and the fingerprint identification module 110 is disposed in a local area below the display screen 120. The fingerprint recognition module 110 includes an optical fingerprint sensor including a sensing array 112 having a plurality of optical sensing units 111.

As an alternative embodiment, the display screen 120 is an OLED display screen, and the fingerprint identification module 300 may utilize the display unit (i.e., the OLED light source) of the OLED display screen 120 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the display screen 120, the display screen 120 emits a beam of light 121 toward the target finger 140, and the light 121 is reflected on the surface of the finger 140 to form reflected light or scattered through the inside of the finger 140 to form scattered light. Because the ridges 141(ridge) and the valleys 142(vally) of the fingerprint have different light reflection capabilities, the reflected light 151 from the ridges and the reflected light 152 from the valleys of the fingerprint have different light intensities, and the reflected light is received by the sensor array 112 in the fingerprint identification module 110 and converted into corresponding electrical signals, i.e., fingerprint detection signals; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the terminal device 10.

Since the basic structure of an OLED display is to form a layer of several tens of nanometers thick organic light emitting material on Indium Tin Oxide (ITO) glass as a light emitting layer, the brightness or intensity of light depends on the properties of the light emitting material and the magnitude of applied current. The light emitting material has low light emitting efficiency, and the larger the applied current is, the faster the light emitting material is aged, and the light emitting efficiency is further decreased. Therefore, the OLED light source has low luminance limited by the light emitting characteristics of the organic light emitting material. The OLED light source is used as an excitation light source for detecting fingerprints by the fingerprint identification module 300, so that the light intensity of fingerprint detection signals is small, and the signal quality is poor.

Based on this, this application provides a fingerprint identification scheme, increases the light filling light source in fingerprint identification device, when the fingerprint detects, opens this light filling light source, and the light intensity of reinforcing fingerprint detection light signal to improve the quality of fingerprint detection electricity signal.

Hereinafter, the fingerprint identification device according to the embodiment of the present application will be described in detail with reference to fig. 2 to 11. Optionally, in this application embodiment, this fingerprint identification device can be the fingerprint module, or, this fingerprint identification device can be the electronic equipment including the fingerprint module, and this application embodiment does not limit this.

It should be noted that, for the sake of understanding, the same structures are denoted by the same reference numerals in the embodiments shown below, and detailed descriptions of the same structures are omitted for the sake of brevity.

Fig. 2 is a schematic structural diagram of a fingerprint identification device 200 and a terminal device 20 to which the fingerprint identification device 200 of the embodiment of the present application is applied, where (a) in fig. 2 is a schematic front view of the terminal device 20 to which the fingerprint identification device 200 of the embodiment of the present application can be applied, and (b) in fig. 2 is a schematic partial sectional structural diagram of the terminal device 10 along a-a' shown in (a) in fig. 2. As shown in fig. 2, the terminal device 20 includes a display 120 and a fingerprint recognition apparatus 200. Fingerprint identification device 200 includes fingerprint identification module 300, this fingerprint identification module 300 is used for setting up display screen 120 below area is used for receiving the light signal of passing through finger 140 reflection and converting into the signal of telecommunication; the light signal includes a first flashing light signal that the first flashing light of the fill light source 400 is reflected by the finger.

Optionally, the fingerprint recognition module 300 includes an optical fingerprint sensor, the optical fingerprint sensor includes a sensing array 322 having a plurality of optical sensing units 321, and the sensing array 322 or the sensing area thereof is the fingerprint detection area 103 of the fingerprint recognition module 300. As shown in fig. 2 (a), the fingerprint detection area 103 is located in the display area of the display screen 120. In an alternative embodiment, the fingerprint identification module 300 may also be disposed at other positions, such as the side of the display screen 120 or the edge opaque region of the terminal device 10, and the optical path is designed to guide the optical signal of at least a part of the display region of the display screen 120 to the fingerprint identification module 300, so that the fingerprint detection region 103 is actually located in the display region of the display screen 120.

It should be understood that the area of the fingerprint detection area 103 may be different from the area of the sensing array of the fingerprint identification module 300, for example, the area of the fingerprint detection area 103 of the fingerprint identification module 300 may be larger than the area of the sensing array of the fingerprint identification module 300 through the optical path design such as lens imaging, reflective folded optical path design, or other optical path design such as light converging or reflecting. In other alternative implementations, if the light path is guided by, for example, light collimation, the fingerprint detection area 103 of the fingerprint identification module 300 may be designed to be substantially the same as the area of the sensing array of the fingerprint identification module 300.

On the other hand, in some embodiments, the sensing array area of the fingerprint identification module 300 is small, for example, only includes an optical fingerprint sensor, and the area of the fingerprint detection area 103 of the fingerprint identification module 300 is small and the position is fixed at this time, so the user needs to press the finger to the specific position of the fingerprint detection area 103 when performing fingerprint input, otherwise the fingerprint identification module 300 may not acquire the fingerprint image and cause the user experience to be poor. In other alternative embodiments, the sensing array of the fingerprint identification module 300 has a large area, and may specifically include a plurality of optical fingerprint sensors; a plurality of optics fingerprint sensor can set up side by side through the concatenation mode the below of display screen 120, just a plurality of optics fingerprint sensor's response area constitutes jointly fingerprint identification module 300's fingerprint detection area 103. That is to say, the fingerprint detection area 103 of fingerprint identification module 300 can include a plurality of sub-areas, and every sub-area corresponds to one of them optical fingerprint sensor's induction zone respectively, thereby will the fingerprint collection area 103 of fingerprint identification module 300 can extend to the main area of the latter half of display screen, extend to the finger and press the region promptly, thereby realize blind formula fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 103 may also be extended to half or even the entire display area, thereby enabling half-screen or full-screen fingerprint detection.

Therefore, when the user needs to unlock the terminal device or perform other fingerprint verification, the user only needs to press a finger on the fingerprint detection area 103 of the display screen 120, so as to realize fingerprint input. Since fingerprint detection can be implemented under the screen, the terminal device 20 adopting the above structure does not need to reserve a special space on the front surface thereof to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, that is, the display area of the display screen 120 can be basically extended to the front surface of the whole terminal device 20.

As an alternative implementation manner, as shown in fig. 2 (b), the fingerprint identification module 300 may include an optical assembly 310 and an optical detection module 320, where the optical detection module 320 includes the sensing array 322, and a reading circuit and other auxiliary circuits electrically connected to the sensing array 322, which may be fabricated on a chip (Die) through a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor, and the sensing array is specifically a Photo detector (Photo detector) array including a plurality of Photo detectors distributed in an array.

Optionally, the optical component 310 may be disposed above the sensing array of the light detection module 320, and may specifically include a Filter layer (Filter)311, a light guide layer 312, and other optical elements, where the Filter layer 311 may be used to Filter ambient light penetrating through a finger and effective fingerprint reflected light signals, and the light guide layer 312 is mainly used to guide the effective fingerprint reflected light signals to the sensing array of the light detection module 320 for optical detection. In the embodiment of the present application, the effective fingerprint-reflected light signal includes a first flashing light signal of the fill-in light source.

Alternatively, as shown in fig. 2 (b), the filter layer 311 may be disposed above the light guide layer 312, or the filter layer 311 is disposed below the light guide layer 312 and above the light detection module 320. The filter layer 311 and the light guide layer 312 may be connected by a fixing device or the filter layer may be directly prepared on the light guide layer 312 by a manufacturing process.

Optionally, the effective fingerprint reflection optical signal is visible light, the sensing array 322 receives and processes the visible light fingerprint optical signal, and the filter layer 311 may be an infrared cut-off filter, and filters infrared ambient light to transmit visible light.

Optionally, the effective fingerprint reflection optical signal is infrared light, the sensing array 322 receives and processes the infrared light fingerprint optical signal, and the filter layer 311 may be a visible light filter, and filters visible light on the screen.

Taking the effective fingerprint reflection optical signal as the visible light as an example, the filter layer 311 may be an infrared cut-off filter, and is disposed above the light guide layer 312 through a fixing device, and a certain air gap is formed between the filter layer 311 and the light guide layer 312. Or the fixing devices are disposed below the light guide layer 312 and above the light detection module 320, and a certain air gap is formed between the filter layer 311 and the light guide layer 312, and between the light detection module 320 and the light guide layer 312.

The filter layer 311 may also be an infrared filter material directly coated on the upper surface of the light guide layer 312. Or coated on the upper surface of the light detection module 320.

In a specific implementation, the optical assembly 310 may be packaged in the same optical fingerprint device as the light detection module 320. For example, the optical component 310 may be packaged in the same optical fingerprint chip as the optical detection module 320, or the optical component 310 may be disposed outside the chip where the optical detection module 320 is located, for example, the optical component 310 is attached on the chip, or some components of the optical component 310 are integrated in the chip.

For example, the light guide layer 312 may specifically be a Collimator (collimater) layer manufactured on a semiconductor silicon wafer, and has a plurality of collimating units or a micro-hole array, where the collimating units may specifically be small holes, and in reflected light reflected back from a finger, light perpendicularly incident to the collimating units may pass through and be received by optical sensing units below the collimating units, and light with an excessively large incident angle is attenuated by multiple reflections inside the collimating units, so that each optical sensing unit can basically only receive reflected light reflected back from fingerprint grains directly above the optical sensing unit, and the sensing array can detect a fingerprint image of the finger.

In another embodiment, the light guiding layer 312 may also be an optical Lens (Lens) layer, which has one or more Lens units, such as a Lens group composed of one or more aspheric lenses, and is used to focus the reflected light reflected from the finger to the sensing array of the light detecting module 320 therebelow, so that the sensing array can image based on the reflected light, thereby obtaining the fingerprint image of the finger. Optionally, the optical lens layer may further have a pinhole formed in an optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to enlarge a field of view of the fingerprint identification module, so as to improve a fingerprint imaging effect of the fingerprint identification module 300.

In other embodiments, the light guide layer 312 or the light path guiding structure may also specifically adopt a Micro-Lens (Micro-Lens) layer, the Micro-Lens layer has a Micro-Lens array formed by a plurality of Micro-lenses, which may be formed above the sensing array of the light detection module 320 through a semiconductor growth process or other processes, and each Micro-Lens may correspond to one of the sensing units of the sensing array. And another optical film layer, such as a dielectric layer or a passivation layer, may be further formed between the microlens layer and the sensing unit, and more specifically, a light blocking layer having micro holes may be further included between the microlens layer and the sensing unit, where the micro holes are formed between the corresponding microlenses and the sensing unit, and the light blocking layer may block optical interference between adjacent microlenses and the sensing unit, and enable light corresponding to the sensing unit to be converged inside the micro holes through the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging. It should be understood that several implementations of the above-mentioned optical path guiding structure may be used alone or in combination, for example, a microlens layer may be further disposed below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific lamination structure or optical path thereof may need to be adjusted according to actual needs.

In the embodiment of the present application, the fingerprint identification module 300 is used for receiving the light signal reflected by the finger 140 and converting the light signal into an electrical signal. The light signal includes a first flashing light signal 411 that the first flashing light 401 emitted by the fill light source 400 is reflected by the finger 140.

As an alternative embodiment, as shown in (b) of fig. 2, the fingerprint recognition device 200 may further include: and a fill-in light source 400. Optionally, the light supplement light source 400 corresponds to the fingerprint detection area 103 in the display screen 120, and the fingerprint identification module 300 may utilize the light supplement light source 400 as an excitation light source for optical fingerprint detection. When the finger 140 presses the fingerprint detection area 103, the fill-in light source 400 emits a first scintillation light 401 to the target finger 140 above the fingerprint detection area 103, and the first scintillation light 401 is reflected on the surfaces of the ridges 141 and the valleys 142 of the finger 140 to form a first scintillation light signal 411.

Adopt fingerprint identification device 200 of this application embodiment to carry out optics fingerprint detection, make fingerprint detection light signal's light intensity no longer be limited by OLED display screen's light source light intensity itself through increasing light filling light source 400, increase fingerprint detection light signal's light intensity. The light supplement light source 400 emits the first flashing light 401, which is different from the ambient light, so that the interference of the ambient light is avoided, the quality of the fingerprint detection signal is improved, and the fingerprint detection can be performed under strong light.

Optionally, the fill-in light source 400 is disposed above the fingerprint recognition module 300 for generating the first flashing light. Optionally, the light supplement light source 400 contacts with the upper surface of the fingerprint identification module 300, specifically, the light supplement light source 400 contacts with the filter layer 311 or the light guide layer 312 of the fingerprint identification module 300. Optionally, light filling light source 400 and fingerprint identification module 300's upper surface contactless makes and keeps certain distance, for example has certain air gap between the upper surface of light filling light source 400 and fingerprint identification module 300.

Optionally, the fill-in light source 400 is disposed below the display screen 120. Optionally, the fill-in light source 400 may be in contact with the lower surface of the display screen 120, for example, the fill-in light source 400 is pasted on the black foam under the OLED display screen 120 through a frame paste. The supplementary lighting source 400 may not contact the lower surface of the display screen 120, so that a certain distance is maintained between the supplementary lighting source 400 and the lower surface of the display screen 120, for example, a certain air gap exists.

Alternatively, the light-compensating light source 400 may be any light-Emitting electric light source, such as a light-Emitting diode (LED), a Laser Diode (LD), or a Vertical Cavity Surface Emitting Laser (VCSEL).

Alternatively, the fill-in light source 400 may be a visible light emitting light source, and may also be a non-visible light emitting light source. For example, the fill light source 400 is an infrared light emitting source.

It should be noted that when the fill light source 400 is a visible light emitting light source, the first blinking light signal is a visible light signal, and thus the effective fingerprint reflection light signal is visible light, in this case, the material of the filter layer 311 is a non-visible light filter material, for example, the filter layer 311 may be an infrared cut filter.

When the fill light source 400 is a non-visible light emitting light source, the first flashing light signal is a non-visible light signal, so that the effective fingerprint reflection light signal is non-visible light, and at this time, the filter layer 311 is made of a visible light filtering material.

Optionally, the fill-in light source 400 is disposed outside a field of view (FOV) of the fingerprint identification module 300. The field of view of the fingerprint recognition module 300 is also referred to as the field angle, and refers to the object space visible range that can be observed by the fingerprint recognition module 300.

Optionally, the light supplement light source 400 is disposed around a lower area corresponding to the fingerprint detection area 103.

Alternatively, the supplementary light source 400 may be a point light source, a line light source, or a surface light source. For example, the fill-in light source 400 is a plurality of discrete LED point light sources, and is disposed around the lower area corresponding to the fingerprint detection area 103 in a dispersed manner. Or the supplementary lighting source 400 is two parallel line light sources, and is disposed at two sides of the lower area corresponding to the fingerprint detection area 103.

Preferably, as shown in fig. 3, the light supplement light source 400 is a hollow surface light source. As shown in fig. 3 (a), the light supplement light source 400 is a circular surface light source with a hollow portion in the middle, wherein the hollow portion does not emit light, and the peripheral ring is a light emitting light source. Alternatively, the light supplement light source 400 is a polygonal area light source with a hollow center, for example, as shown in fig. 3 (b), the light supplement light source 400 is a rectangular area light source with a hollow center, or as shown in fig. 3 (c), the light supplement light source 400 is a hexagonal area light source with a hollow center.

Preferably, the hollow surface light source is disposed below the center of the fingerprint detection area 103, the light emitting area of the hollow surface light source is located around the corresponding lower area of the fingerprint detection area 103, and the view field of the fingerprint identification module 300 is located in the hollow area of the hollow surface light source.

Preferably, the fingerprint identification module 300 is disposed below the center of the hollow area light source.

The hollow area light source can provide additional uniform light source for the finger, and the normal fingerprint detection area is not affected.

It should be understood that in a specific implementation, the terminal device 20 further includes a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, positioned above the display screen 120 and covering the front surface of the terminal device 20. Because, in the present embodiment, the pressing of the finger on the display screen 120 actually means pressing on the cover plate above the display screen 120 or the surface of the protective layer covering the cover plate.

What need to explain, the fingerprint identification module in this application embodiment also can be called optical fingerprint device, and optical fingerprint identification module, fingerprint identification device, fingerprint identification module, fingerprint collection device etc. but above-mentioned term mutual replacement.

Fig. 4 is a schematic functional block diagram of a fingerprint identification device 200 provided in an embodiment of the present application. As shown in fig. 4, the fingerprint recognition device 200 includes a fingerprint recognition module 300, wherein the fingerprint recognition module 300 is used for receiving the optical signal reflected by the finger 140 and converting the optical signal into an electrical signal; the light signal includes a first flashing light signal that the first flashing light of the fill light source 400 is reflected by the finger.

Optionally, as shown in fig. 4, the fingerprint identification device 200 may further include a fill-in light source 400 for generating the first flickering light.

Optionally, the fingerprint identification module 300 generates a first control signal, and the first control signal controls a switching frequency and/or a switching time of the fill-in light source to emit the first flickering light.

Optionally, as shown in fig. 4, the fingerprint identification module 300 may further include a first control module 330. The first control module 330 generates a first control signal 301, and the first control signal 301 controls a switching frequency and/or a switching time of the fill-in light source 400 to emit the first scintillation light 401.

It should be understood that the first control signal 301 may be any electrical signal, such as a sine wave, a cosine wave, a triangular wave, or a pulse wave signal, for example, that controls the fill light source 400 to emit the first scintillation light 401.

By way of example and not limitation, the first control signal 301 is a rectangular-wave pulse signal, the switching frequency of the fill-in light source 400 is the frequency of the first control signal 301, and the single turn-on time of the fill-in light source 400 is the pulse width of the first control signal 301. When the pulse reaches the maximum amplitude, the light supplement light source is started, the time for maintaining the maximum amplitude is the time for starting the light supplement light source at a single time, when the pulse reaches the minimum amplitude, the light supplement light source is closed, and the time for maintaining the minimum amplitude is the time for closing the light supplement light source at a single time.

Alternatively, the first control signal 301 is a rectangular wave pulse signal with a fixed frequency and width, and accordingly, the change in the intensity of the first scintillation light 401 with time appears as a rectangular wave pulse with the same frequency and width as the first control signal 301, and the first scintillation light 401 is a scintillation light that scintillates at a fixed frequency and emission time. For convenience of description, hereinafter, the change in light intensity with time is also written as a change in light intensity.

Alternatively, the first control signal 301 is a rectangular wave pulse signal with a frequency varying with time or a rectangular wave pulse signal with a width varying. When the first control signal 301 is a rectangular wave pulse signal whose frequency varies with time, the time interval between two pulses may be different. When the first control signal 301 is a rectangular wave pulse signal whose pulse width varies with time, the pulse widths of the two pulses may be different. Accordingly, the first scintillation light 401 exhibits a rectangular wave pulse having the same frequency or pulse width as the first control signal 301, and the first scintillation light 401 is scintillation light that scintillates at a non-fixed frequency or scintillation light that scintillates at a non-fixed light emission time. For convenience of description, hereinafter, the variation of frequency with time is also written as a frequency variation, and the variation of pulse width with time is also written as a pulse width variation.

Optionally, the fingerprint identification module 300 may further include an optical assembly 310 and a light detection module 320. The optical assembly 310 receives the first optical signal 410 and transmits the first optical signal 410 to the optical detection module 320, and the optical detection module 320 is configured to receive the first optical signal 410 and convert the first optical signal 410 into a first electrical signal 510.

Optionally, the first light signal 410 includes a first scintillation light signal 411 in which the first scintillation light 401 is reflected by the finger 140.

Optionally, the first light signal 410 further comprises an ambient light signal 412 of the ambient light 402 reflected by the finger.

It should be understood that the ambient light is a light signal with constant intensity or slowly changing frequency in the external environment, and the first scintillation light 401 may be any light signal with intensity changing differently from the ambient light 402, which is not limited herein in this embodiment of the application.

By way of example and not limitation, the change in intensity of the first scintillation light 401 appears as a rectangular wave pulse having the same frequency and width as the first control signal 301, and the first scintillation light 401 is a scintillation light that scintillates at a fixed frequency and emission time. Accordingly, after reflection by the finger, the change in the intensity of the first flashing light signal 411 also appears as a rectangular wave pulse having the same frequency and width as the first control signal 301. The ambient light 402 is a light signal with constant light intensity, and accordingly, after reflection by the finger, the ambient light signal 412 is also a light signal with constant light intensity. Since the first optical signal 410 includes the first scintillation optical signal 411 and the ambient optical signal 412, the first electrical signal 510 obtained by converting the first optical signal 410 includes electrical signal components corresponding to the first scintillation optical signal 411 and the ambient optical signal 412, and the first electrical signal 510 also appears as a rectangular wave pulse having the same frequency and width as the first control signal 301 under the influence of the change in the intensity of the first scintillation optical signal 411. The maximum amplitude of the pulse of the first electrical signal 510 is the electrical signal generated when the first scintillation light signal 411 and the ambient light signal 412 are simultaneously applied, and the minimum amplitude of the pulse of the first electrical signal 510 is only the electrical signal generated when the ambient light signal 412 is applied.

Optionally, the fingerprint identification module 300 may process the electrical signal to obtain a first fingerprint detection signal; the first fingerprint detection signal is an electrical signal processed based on the first flickering light signal.

Optionally, as shown in fig. 4, the fingerprint identification module 300 further includes a first processing module 340. The first processing module 340 is configured to process the first electrical signal 510 to obtain a first fingerprint detection signal 610. The first fingerprint detection signal 610 corresponds to the first flickering light signal 411 and is not disturbed by the ambient light signal 412.

Optionally, the first processing module 340 is configured to remove an electrical signal component generated when the first electrical signal 510 is applied corresponding to the ambient light 412, so that the first fingerprint detection processing signal 611 is only the electrical signal component generated when the first scintillation light signal 411 is applied. For example, when the first control signal 301 is a rectangular wave pulse signal with fixed frequency and width, the first electrical signal 510 also represents a rectangular wave pulse with the same frequency and width as the first control signal 301, and the first processing module 340 is configured to subtract the minimum amplitude of the pulse from the first electrical signal 510, so that the generated electrical signal is the first fingerprint detection processing signal 611. The first fingerprint detection signal 610 comprises said first fingerprint detection processing signal 611.

Optionally, the light detection module 320 may be further configured to process the first fingerprint detection signal 610 to obtain a fingerprint image signal.

It should be understood that the first control module 330, the first processing module 340 and the light detection module 320 may be a plurality of independent chips, each of which is packaged as an independent chip, or may be a bare chip module grown on a plurality of wafers, and a plurality of bare chip modules are packaged to form one chip.

In the embodiment of the present application, the fill-in light source 400 emits the first scintillation light 401 through the first control signal 301, the first scintillation light 401 is different from the ambient light, and the interference of the electrical signal generated by the ambient light is filtered through processing the first electrical signal 510 generated by the fingerprint identification module 300, so as to obtain the fingerprint detection electrical signal. Therefore, during fingerprint detection, the embodiment of the application can eliminate the interference of ambient light, improve the signal quality of a fingerprint detection electric signal and perform fingerprint identification in a strong light environment.

Fig. 5 is a schematic functional block diagram of another fingerprint identification device 200 provided in the embodiment of the present application. As shown in fig. 5, the fingerprint recognition device 200 may include a light supplement source 400 and a fingerprint recognition module 300.

Optionally, the fingerprint recognition module 300 may include an optical assembly 310, a light detection module 320, a first control module 330, and a first processing module 340.

Optionally, the fingerprint identification module 300 generates a first modulation control signal, and the first modulation control signal controls the switching frequency and/or the switching time of the fill-in light source 400 to change with time.

Alternatively, as shown in fig. 5, the first control module 330 may include a first modulation control module 331. The first modulation control module 331 is configured to generate a first modulation control signal 302 through modulation, where the first modulation control signal 302 controls a switching frequency and/or a switching time of the fill light source 400 to change with time, so as to emit the first modulated scintillation light 403. In this case, the first control signal 301 is the first modulation control signal 302, and the first scintillation light 401 is the first modulated scintillation light 403.

Optionally, the first modulation control module 331 receives a first modulation signal 501 and a first carrier signal 502, and performs modulation based on the first modulation signal 501 and the first carrier signal 502 to obtain the first modulation control signal 302.

Alternatively, the first modulation signal 501 may be an analog signal or a digital signal, wherein the analog first modulation signal is a low frequency signal, and may be a sine wave, a cosine wave, or the like.

Alternatively, the first carrier signal 502 is a high frequency signal, which may be a sine wave, a cosine wave, a square wave, a pulse or a sawtooth wave, etc. with respect to the first modulation signal 501.

Optionally, the first modulation signal 501 is an analog signal, and the first modulation control module 331 includes an analog modulation circuit, where if the first carrier signal 502 is a sine wave signal, the modulation method includes: amplitude Modulation (AM), Frequency Modulation (FM), Phase Modulation (PM), and the like. If the first carrier signal 502 is a pulse signal, the modulation method includes: pulse Amplitude Modulation (PAM), Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM), pulse position modulation (PDM), and the like.

Optionally, the first modulation signal 501 is a digital signal, and the first modulation control module 331 includes a digital modulation circuit, wherein if the first carrier signal 502 is a sine wave signal, the modulation method includes: amplitude-shift keying (ASK), frequency-shift keying (FSK), and phase-shift keying (PSK), among others. If the first carrier signal 502 is a pulse signal, the modulation method includes: pulse Code Modulation (PCM), Delta Modulation (DM), and the like.

By way of example and not limitation, the first modulation control module 331 employs FM frequency modulation, and the first modulation control signal 302 is a first FM control signal, i.e., the frequency of the first modulation control signal 302 varies as a linear function of the first modulation signal 501.

By way of example and not limitation, the first modulation control module 331 employs PWM pulse width modulation, the first modulation control signal 302 is a first modulated pulse width signal, the first modulation signal 501 is a sine wave, the first carrier signal 502 is a high frequency sawtooth wave, the first modulation control signal 302 is a pulse signal obtained by comparing the level of the first modulation signal 501 with the level of the first carrier signal 502, and the pulse width of the first modulation control signal 302 varies with the level of the first modulation signal 501.

In the embodiment of the present application, the first modulated scintillation light 403 is formed by controlling the switching frequency of the fill light source 400 through the first modulation control signal 302, and the variation of the light intensity of the first modulated scintillation light 403 with time is related to or the same as the variation of the frequency of the first modulation control signal 302 with time, or the first modulated scintillation light 403 is formed by controlling the switching time of the fill light source 400 through the first modulation control signal 302, and the variation of the light intensity of the first modulated scintillation light 403 with time is related to or the same as the variation of the level of the first modulation control signal 302 with time. Accordingly, the first modulated scintillation light signal 421 of the first modulated scintillation light 403 reflected by the finger is related to or the same as the frequency change or the level change of the first modulated control signal 302, respectively.

By way of example and not limitation, the first modulation control signal 302 is a rectangular wave pulse signal with a varying frequency or a rectangular wave pulse signal with a varying width, and accordingly, the light intensity variation of the first modulated scintillation light 421 appears as the same rectangular wave pulse as the first modulation control signal 302.

Optionally, in the embodiment of the present application, the optical assembly 310 receives the first modulated optical signal 420 reflected by the finger and transmits the first modulated optical signal 420 to the optical detection module 320, and the optical detection module 320 is configured to receive the first modulated optical signal 420 and convert the first modulated optical signal 420 into the first modulated electrical signal 520.

Optionally, the first modulated light signal 420 includes a first modulated scintillation light signal 421 in which the first modulated scintillation light 403 is reflected by the finger 140.

Optionally, the first modulated light signal 420 further comprises an ambient light signal 412 of the ambient light 402 reflected by the finger.

In the above case, the first optical signal 410 may be the first modulated optical signal 420.

In the embodiment of the present application, the first modulated electrical signal 520 contains the same electrical signal components as the first modulated scintillation light signal 421 due to the frequency variation or the pulse width variation of the intensity of the first modulated scintillation light signal 421.

Optionally, the fingerprint identification module 300 demodulates the electrical signal to obtain a first fingerprint detection signal.

Optionally, as shown in fig. 5, the first processing module 340 may further include a first demodulation module 341, where the first processing module 340 is configured to process the first modulated electrical signal 520 to obtain a first fingerprint detection demodulation signal 612. In the above case, the first electrical signal 510 may be the first modulated electrical signal 520. The first fingerprint detection signal 610 may be a first fingerprint detection demodulation signal 612.

Optionally, the first demodulation module 341 includes a coherent demodulation circuit, obtains the first carrier signal 502, multiplies the first modulated electrical signal 520 by the first carrier signal 502 through a multiplier, and filters the high frequency signal with a low pass filter to obtain the first fingerprint detection demodulation signal 612.

Optionally, the first demodulation module 341 includes a non-coherent demodulation circuit, and demodulates the first fingerprint detection demodulation signal 612 through an envelope detector, for example, a diode envelope detector composed of a diode and a low pass filter.

By way of example and not limitation, the first modulation control module 331 employs FM frequency modulation, the frequency of the generated first modulation control signal 302 varies according to a linear function of the first modulation signal 501, and the first demodulation module 341 employs a frequency discriminator circuit to demodulate the first modulation electrical signal 520 to obtain a first fingerprint detection demodulation signal 612 reflecting the variation of the first modulation signal 501, where the first fingerprint detection demodulation signal 612 includes both the light intensity information of the first modulated scintillation light signal 421 and is not interfered by the ambient light signal 412. For example, the first modulated electrical signal 520 is derived over time to obtain a frequency modulated amplitude modulated signal, and the amplitude variation of the frequency modulated amplitude modulated signal is detected by envelope detection to obtain the first fingerprint detection demodulated signal 612.

Optionally, the first modulation control module 331 may further obtain a first modulation signal 501 and a first carrier signal 502, and the first modulation signal 501 and the first carrier signal 502 may be sent to the first modulation control module 331 by a processor.

Optionally, the light detection module 320 may be further configured to process the first fingerprint detection demodulation signal 612 to obtain a fingerprint image signal.

In the embodiment of the present application, the fill light source 400 emits the first modulated scintillation light 403 by the first modulation control signal 302, the frequency or pulse width of the first modulated scintillation light 403 changes with time, and different from the ambient light, by demodulating the first modulated electrical signal 520 generated by the fingerprint identification module 300, a fingerprint detection electrical signal based on the frequency or pulse width change of the first modulated scintillation light 403 is obtained, and the signal quality of the fingerprint detection electrical signal is further improved under the condition of eliminating the interference of the ambient light.

Fig. 6 is a schematic functional block diagram of another fingerprint identification device 200 provided in the embodiment of the present application. As shown in fig. 6, the fingerprint recognition device 200 includes a fingerprint recognition module 300. The fingerprint identification module 300 is used for receiving the optical signal reflected by the finger and converting the optical signal into an electrical signal; the light signals comprise a first flashing light signal which is reflected by the finger and is used for the first flashing light of the light supplementing light source and a second flashing light signal which is reflected by the finger and is used for the second flashing light of the display screen.

Optionally, as shown in fig. 6, the fingerprint identification device 200 may further include a fill-in light source 400.

Optionally, the fingerprint recognition module 300 may include an optical assembly 310, a light detection module 320 and a first control module 330.

Optionally, the fingerprint identification module 300 may generate a second control signal, where the second control signal controls a switching frequency and/or a switching time of a pixel unit in a display screen to emit the second flickering light.

Optionally, as shown in fig. 6, the fingerprint identification module 300 may further include a second control module 350. The second control module 350 is configured to generate a second control signal 303 to control a switching frequency and/or a switching time of a switching frequency of a pixel unit in the display screen 120 to emit the second scintillation light 404.

It should be understood that the second control signal 302 may be any electrical signal that controls the display screen 120 to emit the second scintillating light 404, such as a sine wave, a cosine wave, a triangular wave, or a pulse wave signal.

By way of example and not limitation, the second control signal 302 is a rectangular wave pulse signal, the switching frequency of the pixel units in the display screen 120 is the frequency of the second control signal 303, and the single turn-on time of the pixel units in the display screen 120 is the pulse width of the second control signal 303.

Alternatively, the second control signal 303 is a rectangular wave pulse signal with a fixed frequency and width, and accordingly, the change in the intensity of the second scintillation light 404 with time appears as a rectangular wave pulse with the same frequency and width as the second control signal 303, and the second scintillation light 404 is a scintillation light that scintillates at a fixed frequency and emission time.

Alternatively, the second control signal 303 is a rectangular wave pulse signal with a frequency varying with time or a rectangular wave pulse signal with a width varying with time. Accordingly, the second scintillation light 404 exhibits a rectangular wave pulse having the same frequency or pulse width as the second control signal 303, and the second scintillation light 404 is scintillation light that scintillates at a non-fixed frequency or scintillation light that scintillates at a non-fixed light emission time.

In the embodiment of the present application, the optical signal reflected by the finger is the second optical signal 430, the optical component 310 receives the second optical signal 430 and transmits the second optical signal 430 to the optical detection module 320, and the optical detection module 320 is configured to receive the second optical signal 430 and convert the second optical signal 430 into the second electrical signal 530.

In the present embodiment, the second light signal 430 includes a first scintillation light signal 411 in which the first scintillation light 401 is reflected by the finger 140 and a second scintillation light signal 431 in which the second scintillation light 404 is reflected by the finger 140.

Optionally, the second light signal 430 further comprises an ambient light signal 412 of the ambient light 402 reflected by the finger.

Alternatively, the first control signal 301 and the second control signal 303 may be the same signal, and the first scintillation light 401 and the second scintillation light 404 may be scintillation light that scintillates synchronously. By way of example and not limitation, the first control signal 301 and the second control signal 303 are identical rectangular wave pulse signals, that is, parameters such as frequency, phase, and amplitude are identical, for example, if the pulse frequency is 1MHz and the pulse width is 1 μ s, the first scintillation light 401 and the second scintillation light 404 flicker synchronously, and the scintillation frequency is 1 MHz.

Optionally, the first control signal 301 and the second control signal 303 are different, by way of example and not limitation, the first control signal 301 and the second control signal 303 are rectangular wave pulse signals with fixed frequencies, and the frequency of the first control signal 301 is different from the frequency of the second control signal 303, so the bright flicker frequencies of the first scintillation light 401 and the second scintillation light 404 are different. For example, the pulse frequency of the second control signal 303 is 1MHz and the pulse width is 1 μ s, and the pulse frequency of the first control signal 301 is 2MHz and the pulse width is 0.5 μ s.

Optionally, the fingerprint identification module 300 processes the electrical signal to obtain a second fingerprint detection signal; the second fringe detection signal is an electrical signal processed based on the first scintillation light signal and the second scintillation light signal.

Optionally, as shown in fig. 6, the fingerprint identification module 300 may further include a second processing module 360, configured to process the second electrical signal 530 to obtain a second fingerprint detection signal 620. The second fingerprint detection signal 620 corresponds to the first scintillation light signal 411 and the second scintillation light signal 431, and is not interfered by the ambient light signal 412.

Optionally, the second processing module 360 is configured to process an electrical signal component generated when the first scintillation light signal 411 and the second scintillation light signal 431 act simultaneously as the second fingerprint detection processing signal 621. For example, when the first control signal 301 and the second control signal 303 are identical rectangular wave pulse signals, the second electrical signal 530 also represents the same rectangular wave pulse, the second processing module 360 is configured to subtract the minimum pulse amplitude from the second electrical signal 530, and the generated electrical signal is the second fingerprint processing detection signal 621. The second fingerprint detection signal 620 includes the second fingerprint detection processing signal 621.

Optionally, the light detection module 320 may be further configured to process the second fingerprint detection processing signal 621 to obtain a fingerprint image signal.

It should be understood that the second control module 350, the second processing module 360 and the light detection module 320 may be a plurality of independent chips, each of which is packaged as an independent chip, or may be a bare chip module grown on a plurality of wafers, and a plurality of bare chip modules are packaged to form one chip.

In the embodiment of the present application, the light supplement light source 400 emits the first scintillation light 401 through the first control signal 301, and the display screen 120 emits the second scintillation light 404 through the second control signal 302, both the first scintillation light 401 and the second scintillation light 404 are different from the ambient light, and the interference generated by the ambient light is filtered by processing the second electrical signal 530 generated by the fingerprint identification module 300, and during fingerprint detection, the first scintillation light and the second scintillation light act at the same time, so that the light intensity of the fingerprint detection signal is increased, and the quality of the fingerprint detection signal is improved.

Fig. 7 is a schematic functional block diagram of another fingerprint identification device 200 provided in the embodiment of the present application. As shown in fig. 7, the fingerprint recognition device 200 may include a light supplement source 400 and a fingerprint recognition module 300.

Optionally, the fingerprint recognition module 300 includes an optical assembly 310, a light detection module 320, a first control module 330, a second control module 350, and a second processing module 360.

Optionally, the first control module 330 may further include a first modulation control module 331.

Optionally, the fingerprint identification module 300 generates a second modulation control signal, where the second modulation control signal controls the switching frequency and/or the switching time of the pixel unit in the display screen to change with time.

Optionally, as shown in fig. 7, the second control module 350 may further include a second modulation control module 351, where the second modulation control module 351 is configured to modulate and generate a second modulation control signal 304, and the second modulation control signal 304 controls a switching frequency and/or a switching time of a pixel unit in the display screen 120 to change with time, so as to emit the second modulated scintillation light 405. Alternatively, the intensity variation of the second modulated scintillation light 405 is represented by a frequency-varying rectangular wave pulse or a pulse width-varying rectangular wave pulse. In this case, the second control signal 303 is the second modulation control signal 304, and the second scintillation light 404 is the second modulated scintillation light 405.

Optionally, the second modulation control module 351 receives a second modulation signal 503 and a second carrier signal 504, and performs modulation based on the second modulation signal 503 and the second carrier signal 504 to obtain the second modulation control signal 304.

Alternatively, the second modulation signal 503 may be an analog signal or a digital signal, wherein the analog second modulation signal 503 is a low frequency signal, and may be a sine wave, a cosine wave, or the like.

Alternatively, the second carrier signal 504 is a high frequency signal with respect to the second modulation signal 503, and may be a sine wave, a cosine wave, a square wave, a pulse or a sawtooth wave.

Optionally, the method for obtaining the second modulation control signal 304 by the second modulation control module 351 through modulation based on the second modulation signal 503 and the second carrier signal 504 includes an analog modulation method and a digital modulation method, where the analog modulation method includes: AM, FM, PM, PAM, PWM, PFM, and PDM, among others. The digital modulation method comprises the following steps: ASK, FSK, PSK, PCM, and DM, etc.

In the embodiment of the present application, the second modulated scintillation light 405 is formed by the second modulation control signal 304 controlling the switching frequency of the pixel unit in the display screen 120, and the variation of the intensity of the second modulated scintillation light 405 with time is related to or the same as the variation of the frequency of the second modulation control signal 304 with time, or the second modulated scintillation light 405 is formed by the second modulation control signal 304 controlling the switching time of the pixel unit in the display screen 120, and the variation of the intensity of the second modulated scintillation light 405 with time is related to or the same as the variation of the level of the second modulation control signal 304 with time. Accordingly, the second modulated scintillation light signal 441 in which the second modulated scintillation light 405 is reflected by the finger is related to or the same as the frequency change or the level change of the second modulated control signal 304.

Optionally, in this embodiment, the optical assembly 310 is configured to receive the second modulated light signal 440 reflected by the finger and transmit the second modulated light signal to the light detection module 320. The optical detection module 320 is used for receiving the second modulated optical signal 440 and converting it into a second modulated electrical signal 540.

In the present embodiment, the second modulated light signal 440 includes a first modulated scintillation light signal 421 in which the first modulated scintillation light 403 is reflected by the finger 140 and a second modulated scintillation light signal 441 in which the second modulated scintillation light 405 is reflected by the finger 140.

Optionally, the second modulated light signal 440 further comprises an ambient light signal 412 of the ambient light 402 reflected by the finger.

In the above case, the second optical signal 430 may be a second modulated optical signal 440.

Alternatively, the first modulation control signal 302 and the second modulation control signal 304 may be pulse signals with the same frequency or pulse width, and the first scintillation light 401 and the second scintillation light 404 may be scintillation light that scintillates synchronously.

Alternatively, the first modulation control signal 302 and the second modulation control signal 304 may be pulse signals varying in frequency or pulse width.

In the embodiment of the present application, under the influence of the frequency variation or the pulse width variation of the light intensity of the first modulated scintillation light signal 421 and the second modulated scintillation light signal 441, the second modulated electrical signal 540 includes the same electrical signal component as the frequency variation or the pulse width variation of the first modulated scintillation light signal 421 and the same electrical signal component as the frequency variation or the pulse width variation of the second modulated scintillation light signal 441.

Optionally, the fingerprint identification module 300 demodulates the electrical signal to obtain the second fingerprint detection signal.

Optionally, as shown in fig. 7, the second processing module 360 may further include a second demodulating module 361, where the second demodulating module 361 is configured to demodulate the second modulated electrical signal 540 to obtain a second fingerprint detection demodulated signal 622. In this case, the second electrical signal 530 can be a second modulated electrical signal 540. The second fingerprint detection signal 620 may be the first fingerprint detection demodulation signal 622.

Optionally, the second demodulation module 361 includes a coherent demodulation circuit or a non-coherent demodulation circuit. The second fingerprint detection demodulation signal 622 includes a first demodulation signal component 623 corresponding to the first modulated scintillation light signal 421 and a second demodulation signal component 623 corresponding to the second modulated scintillation light signal 441.

By way of example and not limitation, the first modulation control module 331 and the second modulation control module 351 each employ FM frequency modulation, the frequency of the generated first modulation control signal 302 varies as a linear function of the first modulation signal 501, and the frequency of the generated second modulation control signal 304 varies as a linear function of the second modulation signal 503. The second demodulation module 322 demodulates the first modulated electrical signal 520 by using two frequency discriminators to obtain a first demodulated signal component 623 reflecting the variation of the first modulated signal 501 and a second demodulated signal component 624 reflecting the variation of the second modulated signal 503. The first demodulated signal component 623 and the second demodulated signal component 624 are processed to obtain a second fingerprint detection demodulated signal 622. The second fingerprint detection demodulation signal 622 includes the intensity information of the first modulated scintillation light signal 421 and the second modulated scintillation light signal 441, and is not interfered by the ambient light signal 412.

Optionally, the second modulation control module 351 may further obtain a second modulation signal 503 and a second carrier signal 504, and the second modulation signal 503 and the second carrier signal 504 may be sent to the second modulation control module 351 by the processor.

Optionally, the light detection module 320 may be further configured to process the second fingerprint detection demodulation signal 622 to obtain a fingerprint image signal.

In the embodiment of the present application, the second modulation control signal 304 enables the display screen 120 to emit the second modulated scintillation light 405, and the first modulation control signal 302 enables the fill light source 400 to emit the first modulated scintillation light 403, the frequency or pulse width of the second modulated scintillation light 405 and the first modulated scintillation light 401 changes with time, and the second modulation electrical signal 540 generated by the fingerprint identification module 300 is demodulated to obtain a fingerprint detection electrical signal based on the frequency or pulse width change of the second modulated scintillation light 405 and the first modulated scintillation light 401, so that the interference of other lights can be effectively eliminated, the light intensity of the fingerprint detection electrical signal can be increased, and the signal quality of the fingerprint detection electrical signal can be significantly improved.

Fig. 8 is a schematic functional block diagram of another fingerprint identification device 200 provided in the embodiment of the present application. As shown in fig. 8, the fingerprint recognition device 200 includes a fingerprint recognition module 300, wherein the fingerprint recognition module 300 is used for receiving the optical signal reflected by the finger 140 and converting the optical signal into an electrical signal; the light signal includes a first flashing light signal that the first flashing light of the fill light source 400 is reflected by the finger.

Optionally, as shown in fig. 8, the fingerprint identification device 200 may further include a fill-in light source 400.

Optionally, as shown in fig. 8, the fingerprint recognition device 200 may further include a processor 500.

Optionally, the processor 500 generates a first control signal, and the first control signal controls a switching frequency and/or a switching time of the fill light source to emit the first scintillation light.

Alternatively, as shown in fig. 8, the processor 500 may include the first control module 330. The first control module 330 is configured to generate a first control signal 301 to control a switching frequency and/or a switching time of the fill-in light source 400, and emit the first scintillation light 401.

Optionally, the first control module 330 may further include a first modulation control module 331, where the first modulation control module 331 is configured to generate the first modulation control signal 302 through modulation, and the first modulation control signal 302 controls a switching frequency and/or a switching time of the fill light source 400 to change with time so as to emit the first modulated scintillation light 403.

Optionally, the fingerprint identification module 300 includes an optical assembly 310 and a light detection module 320 for converting the first optical signal 410 into a first electrical signal 510.

In the present embodiment, the first light signal 410 includes a first scintillation light signal 411 in which the first scintillation light 401 is reflected by the finger 140.

Optionally, the processor 500 may process the electrical signal to obtain a first fingerprint detection signal; the first fingerprint detection signal is an electrical signal processed based on the first flickering light signal.

Optionally, as shown in fig. 8, the processor 500 further includes a first processing module 340, configured to process the first electrical signal 510 to obtain a first fingerprint detection signal 610. The first fingerprint detection signal 610 corresponds to the first flickering light signal 411 and is not disturbed by the ambient light signal 412.

Optionally, the first processing module 340 further includes a first demodulation module 341, and the first demodulation module 341 is configured to demodulate the first electrical signal 510 to obtain a first fingerprint detection demodulation signal 612. The first fingerprint detection signal 610 comprises the first fingerprint detection demodulation signal 612.

Optionally, the processor 500 may be further configured to process the first fingerprint detection signal 610 to obtain a fingerprint image signal.

Fig. 9 is a schematic functional block diagram of another fingerprint identification device 200 provided in the embodiment of the present application. As shown in fig. 9, the fingerprint recognition device 200 includes a fingerprint recognition module 300. The fingerprint identification module 300 is used for receiving the optical signal reflected by the finger and converting the optical signal into an electrical signal; the light signals comprise a first flashing light signal which is reflected by the finger and is used for the first flashing light of the light supplementing light source and a second flashing light signal which is reflected by the finger and is used for the second flashing light of the display screen.

Optionally, as shown in fig. 9, the fingerprint identification device 200 may further include a fill-in light source 400.

Optionally, the processor 500 may include a first control module 330.

Alternatively, the processor 500 may generate a second control signal that controls a switching frequency and/or a switching time of a pixel unit in the display screen to emit the second scintillation light.

Optionally, as shown in fig. 9, the processor 500 further includes a second control module 350, where the second control module 350 is configured to generate a second control signal 303 to control a switching frequency and/or a switching time of a switching frequency of a pixel unit in the display screen 120 to emit the second scintillation light 404.

Optionally, the second control module 350 further includes a second modulation control module 351, where the second modulation control module 351 is configured to modulate and generate the second modulation control signal 304, and the second modulation control signal 304 controls a switching frequency and/or a switching time of a pixel unit in the display screen 120 to change with time so as to emit the second modulated scintillation light 405.

Optionally, the fingerprint recognition module 300 may include an optical assembly 310 and a light detection module 320 for converting the second optical signal 430 into a second electrical signal 530.

Optionally, the processor 500 processes the electrical signal to obtain a second fingerprint detection signal; the second fringe detection signal is an electrical signal processed based on the first scintillation light signal and the second scintillation light signal.

Optionally, as shown in fig. 9, the processor 500 may further include a second processing module 360 for processing the second electrical signal 530 to obtain a second fingerprint detection signal 620. The second fingerprint detection signal 620 corresponds to the first scintillation light signal 411 and the second scintillation light signal 431, and is not interfered by the ambient light signal 412.

Optionally, the second processing module 360 further includes a second demodulating module 361, where the second demodulating module 361 is configured to demodulate the second electrical signal 530 to obtain a second fingerprint detection demodulated signal 622.

Optionally, the processor 500 may be further configured to process the second fingerprint detection signal 620 to obtain a fingerprint image signal.

Fig. 10 is a schematic functional block diagram of another fingerprint identification device 200 provided in the embodiment of the present application. As shown in fig. 10, the fingerprint recognition device 200 may include a fill-in light source 400, a fingerprint recognition module 300 and a processor 500.

Optionally, the processor 500 is configured to receive first indication information 710, and turn on the fill-in light source 400 according to the first indication information 710.

The first indication information 710 indicates that there is a finger touch on the display screen 120, and specifically indicates that there is a finger touch on the first detection area 103 on the display screen 120.

By way of example and not limitation, the display screen 120 is a touch display screen with a touch function, and when a finger touches the first detection area 103 in the display screen 120, the display screen 120 sends first indication information to the processor 500.

Optionally, the processor 500 is further configured to receive second indication information 720, and turn on the fill-in light source 400 according to the first indication information 710 and the second indication information 720.

The second indication 720 indicates the presence of ambient light exceeding a first threshold intensity.

By way of example and not limitation, the electronic device including the fingerprint recognition device 200 includes a light sensor, and the light sensor sends the second indication information to the processor 500 when receiving a certain threshold intensity of ambient light.

Optionally, the processor 500 is further configured to receive the first indication information 710 and the second indication information 720, and control the fingerprint identification module 300 to start operating according to the first indication information 710 and the second indication information 720, that is, start converting the received optical signal into an electrical signal.

Optionally, the processor 500 is further configured to receive a third indication signal, and turn off the fill-in light source 400 according to the third indication signal.

The third indication information indicates that the fingerprint recognition device 200 has processed a fingerprint image.

As an example and not by way of limitation, the fingerprint recognition module 300 in the fingerprint recognition device 200 processes the fingerprint image, and the fingerprint recognition module 300 sends the third indication information to the processor 500.

Optionally, the processor 500 may be further configured to control the display screen 120 to start detecting whether there is a finger touch.

Optionally, the processor 500 may be further configured to control the light sensor to start detecting ambient light.

In this application embodiment, through opening and closing of treater 500 control light filling light source 400 to and the operation of control fingerprint identification module 300, can effectually reduce the fingerprint and trigger the erroneous judgement, and can effectively reduce the consumption that light filling light source 400 brought.

Fig. 11 is a flowchart illustrating a method for activating the fingerprint identification device 200 to perform fingerprint identification according to an embodiment of the present application. The fingerprint recognition device 200 may include a fingerprint recognition module 300 and a light supplement light source 400.

S110: receiving first indication information, wherein the first indication information indicates that finger touch exists on a display screen, and specifically indicates that finger touch exists in a fingerprint detection area on the display screen.

By way of example and not limitation, the display screen is a touch display screen with a touch function, and when a finger touches a fingerprint detection area in the display screen, the display screen sends first indication information. The fingerprint recognition device 200 receives the first indication information.

S120: second indication information is received, the second indication information indicating the presence of ambient light exceeding a first threshold intensity.

By way of example and not limitation, the electronic device including the fingerprint recognition device 200 includes a light sensor that sends the second indication information when receiving a certain threshold intensity of ambient light. The fingerprint recognition device 200 receives the second indication information.

S130: and turning on the light supplementing light source 400 according to the first indication information and the second indication information. The fill light source 400 emits a first scintillation light.

S140: the first blinking light is emitted by controlling the switching frequency and/or the switching time of the fill-in light source 400.

S150: controlling the fingerprint identification module 300 to start running.

Optionally, the fingerprint identification module 300 is controlled to start receiving optical signals and convert the optical signals into electrical signals, where the optical signals include a first optical signal reflected by the finger after the first flashing light of the light supplement source 400.

S160: third indication information is received, wherein the third indication information indicates that the fingerprint identification device 200 has processed the fingerprint image.

As an example and not limitation, the fingerprint recognition module 300 in the fingerprint recognition device 200 processes the fingerprint image, and the fingerprint recognition module 300 sends the third indication information. The fingerprint recognition device 200 receives the third indication information.

S170: and turning off the light supplement light source 400 according to the third indication information.

As shown in fig. 12, an electronic device 600 may be further provided in an embodiment of the present application, where the electronic device 600 may include a fingerprint identification apparatus 610, and the fingerprint identification apparatus 610 may be the fingerprint identification apparatus 200 in the foregoing apparatus embodiment, which can be used to execute the contents in the method embodiment shown in fig. 11, and details are not repeated here for brevity.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the fingerprinting of embodiments of the present application may also include memory, which may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Embodiments of the present application also provide a computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a portable electronic device comprising a plurality of application programs, enable the portable electronic device to perform the method of the embodiment shown in fig. 8.

The embodiment of the present application also provides a computer program, which includes instructions, when the computer program is executed by a computer, the computer may execute the method of the embodiment shown in fig. 11.

The embodiment of the present application further provides a chip, where the chip includes an input/output interface, at least one processor, at least one memory, and a bus, where the at least one memory is used to store instructions, and the at least one processor is used to call the instructions in the at least one memory to execute the method of the embodiment shown in fig. 11.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An apparatus for fingerprint recognition, comprising:

the fingerprint identification module is arranged below the display screen and used for receiving the optical signals reflected by the finger and converting the optical signals into electric signals; the light signals comprise first flashing light signals of first flashing light of the light supplementing light source, and the first flashing light signals are reflected by the fingers;

the processor is used for receiving first indication information and second indication information, the first indication information is used for indicating that finger touch exists on the display screen, the second indication information is used for indicating that ambient light with intensity exceeding a first threshold exists, the processor is used for turning on the light supplementing light source according to the second indication information and the first indication information, and the light supplementing light source is used for generating first flickering light;

the light supplementing light source is arranged below the display screen and above the fingerprint identification module, the light supplementing light source is a hollow area light source, and the view field of the fingerprint identification module is located in the hollow area of the hollow area light source.

2. The apparatus of claim 1, further comprising the supplemental light source.

3. The device of claim 1, wherein the fill-in light source is disposed outside a field of view of the fingerprint identification module.

4. The device of claim 1, wherein the hollow surface light source comprises:

hollow circular area light source, hollow rectangular area light source or hollow hexagonal area light source.

5. The device of claim 1, wherein the fingerprint identification module is disposed below a center of the hollow area light source.

6. The device according to any one of claims 1-5, wherein the fill light source is an infrared light emitting light source.

7. The apparatus according to any of claims 1-5, wherein the fingerprint recognition module is configured to generate a first control signal, and the first control signal controls a switching frequency and/or a switching time of the fill light source to emit the first flickering light.

8. The apparatus of claim 7, wherein the first control signal comprises a first modulation control signal, and the first modulation control signal controls a switching frequency and/or a switching time of the fill light source to vary with time.

9. The device according to any one of claims 1 to 5, wherein the fingerprint identification module is configured to process the electrical signal to obtain a first fingerprint detection signal;

the first fingerprint detection signal is an electrical signal based on the first flickering light signal.

10. The apparatus according to claim 9, wherein the fingerprint identification module is configured to demodulate the electrical signal to obtain the first fingerprint detection signal.

11. The device of any of claims 1-5, wherein the light signal further comprises a second flashing light signal of a display screen where a second flashing light is reflected by the finger.

12. The apparatus of claim 11, wherein the fingerprint recognition module is configured to generate a second control signal, and the second control signal controls a switching frequency and/or a switching time of a pixel unit in the display screen to emit the second flickering light.

13. The apparatus of claim 12, wherein the second control signal comprises a second modulation control signal that controls a switching frequency and/or a switching time of a pixel cell in the display screen to vary with time.

14. The apparatus according to claim 11, wherein the fingerprint identification module is configured to process the electrical signal to obtain a second fingerprint detection signal;

the second fingerprint detection signal is an electrical signal based on the first and second scintillation light signals.

15. The apparatus according to claim 14, wherein the fingerprint identification module is configured to demodulate the electrical signal to obtain the second fingerprint detection signal.

16. The apparatus of any of claims 1-5, wherein the processor is configured to generate a first control signal, and the first control signal controls a switching frequency and/or a switching time of the fill light source to emit the first scintillation light.

17. The apparatus of claim 16, wherein the first control signal comprises a first modulation control signal, and the first modulation control signal controls a switching frequency and/or a switching time of the fill light source to vary with time.

18. The apparatus of claim 16, wherein the processor is configured to process the electrical signal to obtain a first fingerprint detection signal;

19. The apparatus of claim 18, wherein the processor is configured to demodulate the electrical signal to obtain the fingerprint detection signal.

20. The apparatus of claim 16, wherein the light signal comprises a second flashing light signal of a second flashing light of the display screen reflected by the finger.

21. The apparatus of claim 20, wherein the processor is configured to generate a second control signal, and wherein the second control signal controls a switching frequency and/or a switching time of a pixel unit in the display screen to emit the second scintillation light.

22. The apparatus of claim 21, wherein the second control signal comprises a second modulation control signal that controls a switching frequency and/or a switching time of a pixel cell in the display screen to vary with time.

23. The apparatus of claim 20, wherein the processor is configured to process the electrical signal to obtain a second fingerprint detection signal;

24. The apparatus of claim 23, wherein the processor is configured to demodulate the electrical signal to obtain the second fingerprint detection signal.

25. An electronic device, comprising:

the fingerprint recognition device according to any one of claims 1 to 24.