CN110214328B

CN110214328B - Fingerprint identification method and device and electronic equipment

Info

Publication number: CN110214328B
Application number: CN201980000581.XA
Authority: CN
Inventors: 张玮; 王磊; 李顺展
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-04-15
Filing date: 2019-04-15
Publication date: 2021-03-19
Anticipated expiration: 2039-04-15
Also published as: WO2020210950A1; CN110214328A

Abstract

The embodiment of the application provides a fingerprint identification method, a fingerprint identification device and electronic equipment, and the fingerprint identification performance can be effectively improved. The method comprises the following steps: when the fingerprint detection area displays a first preset pattern comprising a first light-emitting area and a first non-light-emitting area, acquiring a first fingerprint image comprising a first image and a second image, wherein the first image is formed by sensor pixels corresponding to the first light-emitting area, and the second image is formed by sensor pixels corresponding to the first non-light-emitting area; when the fingerprint detection area displays a second predetermined pattern comprising a second light-emitting area and a second non-light-emitting area, acquiring a second fingerprint image comprising a third image and a fourth image, wherein the third image is formed by sensor pixels corresponding to the second light-emitting area, the fourth image is formed by sensor pixels corresponding to the second non-light-emitting area, the second light-emitting area is in the same position as the first non-light-emitting area, and the second non-light-emitting area is in the same position as the first light-emitting area.

Description

Fingerprint identification method and device and electronic equipment

Technical Field

The embodiment of the application relates to the technical field of fingerprint identification, and more particularly relates to a fingerprint identification method, a fingerprint identification device and an electronic device.

Background

With the rapid development of the electronic equipment industry, a full screen becomes a trend, and optical fingerprints are generated at the same time. Optical fingerprint technology images the difference of the reflection capacity of light by the ridges and valleys of a fingerprint, thereby performing fingerprint identification.

However, the above approach is susceptible to a variety of effects. For example, when the finger of the user is dry, an air gap exists due to poor contact between the display screen and the finger, and at this time, the difference between the reflection capacities of the ridges and the valleys of the fingerprint to light is small, so that the signal is weak, the imaging quality is poor, and the fingerprint identification performance may be affected.

Therefore, how to effectively improve the performance of fingerprint identification becomes an urgent problem to be solved.

Disclosure of Invention

The embodiment of the application provides a fingerprint identification method, a fingerprint identification device and electronic equipment, which can effectively improve the performance of fingerprint identification.

In a first aspect, a method of fingerprint identification is provided, including: when a fingerprint detection area displays a first preset pattern, acquiring a first fingerprint image, wherein the first fingerprint image comprises a first image and a second image, the first preset pattern comprises a first light-emitting area and a first non-light-emitting area, the first image is formed by a first sensor pixel set corresponding to the first light-emitting area, and the second image is formed by a second sensor pixel set corresponding to the first non-light-emitting area;

when the fingerprint detection area displays a second predetermined pattern, acquiring a second fingerprint image, wherein the second fingerprint image comprises a third image and a fourth image, the second predetermined pattern comprises a second light-emitting area and a second non-light-emitting area, the third image is formed by a third sensor pixel set corresponding to the second light-emitting area, the fourth image is formed by a fourth sensor pixel set corresponding to the second non-light-emitting area, the second light-emitting area is in the same position as the first non-light-emitting area, and the second non-light-emitting area is in the same position as the first light-emitting area;

wherein at least one group of the following images is used for fingerprint recognition: the first and third images, the second and fourth images.

In some possible embodiments, the method further comprises: and carrying out fingerprint identification according to the first image and the third image and/or according to the second image and the fourth image.

In some possible embodiments, the performing fingerprint recognition based on the first image and the third image, and/or based on the second image and the fourth image includes: splicing the first image and the third image to obtain a first spliced image; and performing fingerprint identification according to the first spliced image.

In some possible embodiments, the performing fingerprint recognition based on the first image and the third image, and/or based on the second image and the fourth image includes: splicing the second image and the fourth image to obtain a second spliced image; and performing fingerprint identification according to the second spliced image.

In some possible embodiments, the light signal emitted by the first light-emitting area is transmitted to the first sensor pixel set after being reflected by a finger, and the light signal emitted by the first light-emitting area is transmitted to the second sensor pixel set after being transmitted by the finger;

and the optical signal emitted by the second light-emitting area is transmitted to the third sensor pixel set after being reflected by the finger, and the optical signal emitted by the second light-emitting area is transmitted to the fourth sensor pixel set after being transmitted by the finger.

In some possible embodiments, the method further comprises: controlling a light source to emit light signals at the first and second light emitting areas.

In some possible embodiments, the light source is an organic light emitting diode OLED.

In some possible embodiments, the first predetermined pattern and the second predetermined pattern are a circular ring pattern, a stripe pattern, or a checkerboard pattern.

In some possible embodiments, if the first predetermined pattern is the stripe pattern, the first light-emitting area includes a plurality of first stripes, the first non-light-emitting area includes a plurality of second stripes, and the plurality of first stripes and the plurality of second stripes are spaced apart.

In some possible embodiments, the method further comprises: when at least one group of the following images is successfully matched with the fingerprint template, determining that the fingerprint identification is finished: the first and third images, the second and fourth images.

In a second aspect, an apparatus for fingerprint recognition is provided, including:

the sensor comprises a plurality of sensor pixels, wherein the sensor is used for acquiring a first fingerprint image when a fingerprint detection area displays a first predetermined pattern, the first fingerprint image comprises a first image and a second image, the first predetermined pattern comprises a first light-emitting area and a first non-light-emitting area, the first image is formed by a first sensor pixel set corresponding to the first light-emitting area, and the second image is formed by a second sensor pixel set corresponding to the first non-light-emitting area; and

when the fingerprint detection area displays a second predetermined pattern, acquiring a second fingerprint image, wherein the second fingerprint image comprises a third image and a fourth image, the second predetermined pattern comprises a second light-emitting area and a second non-light-emitting area, the third image is formed by a third sensor pixel set corresponding to the second light-emitting area, the fourth image is formed by a fourth sensor pixel corresponding to the second non-light-emitting area, the second light-emitting area is in the same position as the first non-light-emitting area, and the second non-light-emitting area is in the same position as the first light-emitting area;

In some possible embodiments, the apparatus further comprises: and the processing unit is used for carrying out fingerprint identification according to the first image and the third image and/or the second image and the fourth image.

In some possible embodiments, the processing unit is specifically configured to: splicing the first image and the third image to obtain a first spliced image; and performing fingerprint identification according to the first spliced image.

In some possible embodiments, the processing unit is specifically configured to: splicing the second image and the fourth image to obtain a second spliced image; and performing fingerprint identification according to the second spliced image.

and the optical signal emitted by the second light emitting area is transmitted to the third sensor pixel set after being reflected by the finger, and the optical signal emitted by the second light emitting area is transmitted to the fourth sensor pixel set after being transmitted by the finger.

In some possible embodiments, the apparatus comprises: a light source for emitting light signals at the first and second light emitting areas.

In some possible embodiments, the processing unit is further configured to: when at least one group of the following images is successfully matched with the fingerprint template, determining that the fingerprint identification is finished: the first and third images, the second and fourth images.

In a third aspect, an electronic device is provided, which includes the apparatus for fingerprint identification in the second aspect or any possible implementation manner of the second aspect.

Based on the technical scheme, when different preset patterns are displayed in the fingerprint detection area, images formed by sensor pixels corresponding to the light-emitting areas and the non-light-emitting areas included in the different preset patterns are collected, and then the images formed by the sensor pixels corresponding to the light-emitting areas and/or the images formed by the sensor pixels corresponding to the non-light-emitting areas are utilized for fingerprint identification, so that the images for identification are added in the fingerprint identification process, and the fingerprint identification performance can be improved. In addition, the image formed by the sensor pixels corresponding to the non-luminous region is utilized for fingerprint identification, the finger can not be in contact with the detection surface, the influence of the contact surface on the fingerprint identification is reduced, and the fingerprint identification performance can be further improved.

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 diagram of a fingerprint image based on a normal finger and a dry finger according to an embodiment of the present application.

Fig. 3 is a schematic diagram of an apparatus for fingerprint identification according to an embodiment of the present application.

Fig. 4 is a schematic view of a predetermined pattern according to an embodiment of the present application.

Fig. 5 is a schematic view of another predetermined pattern of an embodiment of the present application.

Fig. 6 is a schematic view of another predetermined pattern of an embodiment of the present application.

Fig. 7 is a schematic flow chart of a method of fingerprint identification of an embodiment of the present application.

Fig. 8 is an exemplary flowchart of a method of fingerprint identification according to an embodiment of the present application.

Fig. 9 is a schematic block diagram of an electronic device of 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.

It should be understood that the embodiments of the present application can be applied to optical fingerprint systems, including but not limited to optical fingerprint identification systems and medical diagnostic products based on optical fingerprint imaging, and the embodiments of the present application are only described by way of example, but should not be construed as limiting the embodiments of the present application, and the embodiments of the present application are also applicable to other systems using optical imaging technology, etc.

As a common application scenario, the optical fingerprint system provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other terminal devices with display screens; more specifically, in the terminal device described above, the fingerprint recognition device may be embodied as an optical fingerprint device, which may be disposed in a partial area or an entire area below the display screen, thereby forming an Under-screen (Under-display) optical fingerprint system. Or, the fingerprint identification device may also be partially or completely integrated inside a display screen of the terminal device, so as to form an In-display (In-display) optical fingerprint system.

As shown in fig. 1, which is a schematic structural diagram of a terminal device to which the embodiment of the present application is applicable, the terminal device 10 includes a display screen 120 and an optical fingerprint device 130, where the optical fingerprint device 130 is disposed in a local area below the display screen 120. The optical fingerprint device 130 comprises an optical fingerprint sensor, the optical fingerprint sensor comprises a sensing array 133 with a plurality of optical sensing units 131, and the area where the sensing array is located or the sensing area is the fingerprint detection area 103 of the optical fingerprint device 130. As shown in fig. 1, the fingerprint detection area 103 is located in a display area of the display screen 120. In an alternative embodiment, the optical fingerprint device 130 may be disposed at other positions, such as the side of the display screen 120 or the edge opaque area of the terminal device 10, and the optical signal of at least a part of the display area of the display screen 120 is guided to the optical fingerprint device 130 through the optical path design, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.

It should be appreciated that the area of the fingerprint sensing area 103 may be different from the area of the sensing array of the optical fingerprint device 130, for example, by the design of optical path such as lens imaging, reflective folded optical path design or other optical path design such as light converging or reflecting, the area of the fingerprint sensing area 103 of the optical fingerprint device 130 may be larger than the area of the sensing array of the optical fingerprint device 130. In other alternative implementations, the fingerprint sensing area 103 of the optical fingerprint device 130 may be designed to substantially coincide with the area of the sensing array of the optical fingerprint device 130 if optical path guidance is performed, for example, by light collimation.

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 in the screen, the terminal device 10 with 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 10.

As an alternative implementation, as shown in fig. 1, the optical fingerprint device 130 includes a light detection portion 134 and an optical assembly 132, where the light detection portion 134 includes the sensing array, and a reading circuit and other auxiliary circuits electrically connected to the sensing array, which can 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, and the Photo detectors can be used as the optical sensing units as described above.

The optical assembly 132 may be disposed above the sensing array of the light detecting portion 134, and may specifically include a Filter layer (Filter) for filtering out ambient light penetrating through the finger, a light guiding layer or a light path guiding structure for guiding reflected light reflected from the surface of the finger to the sensing array for optical detection, and other optical elements.

In particular implementations, the optical assembly 132 may be packaged with the same optical fingerprint component as the light detection portion 134. For example, the optical component 132 may be packaged in the same optical fingerprint chip as the optical detection portion 134, or the optical component 132 may be disposed outside the chip where the optical detection portion 134 is located, for example, the optical component 132 is attached to the chip, or some components of the optical component 132 are integrated into the chip.

For example, the light guide layer may specifically be a Collimator (collimater) layer manufactured on a semiconductor silicon wafer, and the collimater unit may specifically be a small hole, and in reflected light reflected from a finger, light perpendicularly incident to the collimater unit may pass through and be received by an optical sensing unit below the collimater unit, and light with an excessively large incident angle is attenuated by multiple reflections inside the collimater unit, so that each optical sensing unit can basically only receive reflected light reflected from a fingerprint pattern 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 or the light path guiding structure 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 portion 134 therebelow, so that the sensing array can perform imaging based on the reflected light, thereby obtaining the fingerprint image of the finger. Optionally, the optical lens layer may further form a pinhole in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to enlarge the field of view of the optical fingerprint device, so as to improve the fingerprint imaging effect of the optical fingerprint device 130.

In other embodiments, the light guide layer 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 detecting portion 134 through a semiconductor growth process or other processes, and each Micro-Lens may respectively 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.

As an alternative embodiment, the display screen 120 may adopt a display screen having a self-Light Emitting display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. Taking an OLED display screen as an example, the optical fingerprint device 130 may use the display unit (i.e., OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 103, the display 120 emits a beam of light 111 toward the target finger 140 above the fingerprint detection area 103, and the light 111 is reflected on the surface of the finger 140 to form reflected light or scattered light by the inside of the finger 140 to form scattered light. Because ridges (ridges) and valleys (vally) of the fingerprint have different light reflection capabilities, reflected light 151 from the ridges and 152 from the valleys have different light intensities, and the reflected light is received by the sensor array 134 in the optical fingerprint device 130 and converted into corresponding electric signals, i.e., fingerprint detection signals, after passing through the optical assembly 132; 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.

In other embodiments, the optical fingerprint device 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint device 130 may be adapted for use with a non-self-emissive display such as a liquid crystal display or other passively emissive display. Taking an application to a liquid crystal display having a backlight module and a liquid crystal panel as an example, to support the underscreen fingerprint detection of the liquid crystal display, the optical fingerprint system of the terminal device 10 may further include an excitation light source for optical fingerprint detection, where the excitation light source may specifically be an infrared light source or a light source of non-visible light with a specific wavelength, and may be disposed below the backlight module of the liquid crystal display or in an edge area below a protective cover of the terminal device 10, and the optical fingerprint device 130 may be disposed below the edge area of the liquid crystal panel or the protective cover and guided through a light path so that the fingerprint detection light may reach the optical fingerprint device 130; alternatively, the optical fingerprint device 130 may be disposed below the backlight module, and the backlight module may be perforated or otherwise optically designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint device 130. When the optical fingerprint device 130 is used to provide an optical signal for fingerprint detection by using an internal light source or an external light source, the detection principle is consistent with the above description.

It should be understood that in a specific implementation, the terminal device 10 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 10. 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.

On the other hand, in some embodiments, the optical fingerprint device 130 may include only one optical fingerprint sensor, where the area of the fingerprint detection area 103 of the optical fingerprint device 130 is small and the location is fixed, so that the user needs to press a finger to a specific location of the fingerprint detection area 103 when performing a fingerprint input, otherwise the optical fingerprint device 130 may not acquire a fingerprint image and the user experience is poor.

In other alternative embodiments, the optical fingerprint device 130 may specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors may be disposed side by side below the display screen 120 in a splicing manner, and sensing areas of the plurality of optical fingerprint sensors jointly form the fingerprint detection area 103 of the optical fingerprint device 130. That is to say, the fingerprint detection area 103 of the optical fingerprint device 130 may include a plurality of sub-areas, each sub-area corresponding to the sensing area of one of the optical fingerprint sensors, respectively, so as to extend the fingerprint collection area 103 of the optical fingerprint module 130 to the main area of the lower half portion of the display screen, that is, to the area that the finger presses conventionally, thereby realizing the blind-touch type fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 130 may also be extended to half or even the entire display area, thereby enabling half-screen or full-screen fingerprint detection.

When the finger is in a normal condition (called as a normal finger), the ridge of the fingerprint is in good contact with the display screen, and because the refractive index of the surface of the finger is similar to that of glass, when light rays strike the ridge of the fingerprint, the reflected light is less; and the valleys of the fingerprint do not contact the display screen, an air gap exists, and most of light is reflected when light rays strike the valleys of the fingerprint because the refractive index of air is smaller than that of a finger. So that the difference of the reflection capacity of the ridges and the valleys of the fingerprint to the light can be imaged to perform fingerprint identification.

However, when the user's finger is dry (i.e., dry), because the ridges of the fingerprint do not make good contact with the display screen, there is an air gap, and thus when light impinges on the valleys and ridges of the fingerprint, most of the light is reflected, resulting in a strong reflection. The difference between the reflected lights of the valleys and the ridges can be said to be derived only from the difference in the structures of the valleys and the ridges and the weak difference in the optical path difference that passes through, so that the signals of the valleys and the ridges are weak when the fingers are dry, thereby causing poor imaging quality and affecting fingerprint identification performance. Fig. 2 is the collected fingerprint images of a normal finger and a dry finger, wherein the left image is the fingerprint image of the normal finger, and the right image is the fingerprint image of the dry finger. It can be seen that the fingerprint image of a normal finger has clear lines, while the fingerprint image of a dry finger has blurred lines.

In order to improve fingerprint identification performance, the embodiment of the application provides a fingerprint identification scheme.

Fig. 3 shows a schematic diagram of a fingerprint recognition device 300 according to an embodiment of the present application. It should be understood that, in the embodiment of the present application, the fingerprint identification device 300 may be a fingerprint identification module corresponding to the optical fingerprint identification device 130 in fig. 1, or the fingerprint identification device 300 may also be an electronic device including the fingerprint identification module, which is not limited in the embodiment of the present application.

As shown in fig. 3, the fingerprint recognition device 300 may include: a sensor 310 comprising a plurality of sensor pixels for acquiring a first fingerprint image when the fingerprint detection area displays a first predetermined pattern; and acquiring a second fingerprint image when the second predetermined pattern is displayed in the fingerprint detection area.

The first fingerprint image comprises a first image and a second image, the first predetermined pattern comprises a first light-emitting area 331 and a first non-light-emitting area 332, the first image is formed by a first sensor pixel set corresponding to the first light-emitting area 331, the second image is formed by a second sensor pixel set corresponding to the first non-light-emitting area 332, the second fingerprint image comprises a third image and a fourth image, the second predetermined pattern comprises a second light-emitting area 333 and a second non-light-emitting area 334, the third image is formed by a third sensor pixel set corresponding to the second light-emitting area 333, the fourth image is formed by a fourth sensor pixel set corresponding to the second non-light-emitting area 334, the second light-emitting area 333 is in the same position as the first non-light-emitting area 332, and the second non-light-emitting area is in the same position as the first light-emitting area 331.

Wherein at least one group of the following images is used for fingerprint recognition: the first image and the third image, the second image and the fourth image.

In the embodiment of the present application, the sensor 310 may also be referred to as a fingerprint sensor, an optical fingerprint sensor, a fingerprint sensor chip, a sensor chip, or the like, and the fingerprint detection area may be referred to as a fingerprint collection area, a fingerprint identification area, or the like. The fingerprint detection area can be a partial area of the display screen or the whole area of the display screen, namely, full-screen biometric feature recognition.

It should be noted that, in the embodiments of the present application, two predetermined patterns are taken as an example for description, but the embodiments are not limited thereto, and the number of the predetermined patterns may be more than two in the embodiments of the present application.

Optionally, in some embodiments, the light signal emitted from the first light emitting area 331 can be transmitted to the first set of sensor pixels after being emitted by the finger, and the light signal emitted from the first light emitting area 331 can be transmitted to the second set of sensor pixels after being transmitted by the finger; and, the light signal emitted from the second light emitting region 333 may be transmitted to the third sensor pixel set after being reflected by the finger, and the light signal emitted from the second light emitting region 333 may be transmitted to the fourth sensor pixel set after being transmitted by the finger.

For convenience of description, the optical signal reflected by the finger is referred to as a reflected optical signal, and the optical signal transmitted from the finger is referred to as a transmitted optical signal. That is, the first image and the third image are images formed based on the reflected light signal, the second image and the fourth image are images formed based on the transmitted light signal, and the transmitted light signal is present in the non-light emitting region of the predetermined pattern.

It can be seen that the technical solution of the embodiment of the present application utilizes the principle of light transmission imaging. The principle of light transmission imaging can be generally: when light rays strike ridges and valleys of a fingerprint, apart from being reflected to form reflected light signals, part of the light rays can be transmitted through the skin of the finger into the dermis, and then transmitted out of the skin after being reflected and scattered by tissues under the epidermis of the finger. When the transmitted optical signal passes through the valleys and ridges in the fingerprint, the absorption capacities of the valleys and the ridges to light are different, specifically, the valleys have a weak absorption capacity to light and transmit light with strong intensity, and the ridges have a strong absorption capacity to light and transmit light with weak intensity.

It should be understood that, the technical solution of the embodiment of the present application may perform other biometric identification based on the transmission imaging principle besides fingerprint identification, for example, face identification, and the like, and the embodiment of the present application is not limited thereto.

In the embodiment of the present application, the first predetermined pattern and the second predetermined pattern are complementary patterns, that is, the superimposed pattern of the first predetermined pattern and the second predetermined pattern may be a pattern of a single color, that is, a pure color spot, for example, a white spot, a red spot, or the like.

Since the transmitted light signal is a light signal emitted from the light source 330 in the light-emitting region and transmitted to the non-light-emitting region by the finger, the signal intensity of the transmitted light signal is stronger closer to the light-emitting region. In order to ensure the signal intensity of the generated transmitted light signal, the first and second predetermined patterns of the embodiments of the present application may be circular ring patterns, stripe patterns, or checkerboard patterns as shown in fig. 4 to 6. Wherein, the left diagram in fig. 4-6 is the first predetermined pattern, and the right diagram is the second predetermined pattern. Therefore, the signal intensity of the collected transmission light signal can be ensured to be stronger.

As can be seen from fig. 4-6, the light-emitting areas in the first predetermined pattern are located in the same position as the non-light-emitting areas in the second predetermined pattern, and the non-light-emitting areas in the first predetermined pattern are located in the same position as the light-emitting areas in the second predetermined pattern, i.e., the first predetermined pattern is complementary to the second predetermined pattern.

When the first and second predetermined patterns are stripe patterns, the first light emitting area may include a plurality of first stripes, and the first non-light emitting area may include a plurality of second stripes, wherein the plurality of first stripes and the plurality of second stripes are spaced apart. Similarly, the second light-emitting area may include a plurality of third stripes, and the second non-light-emitting area may include a plurality of fourth stripes, wherein the plurality of third stripes and the plurality of fourth stripes are spaced apart.

Of course, the first predetermined pattern and the second predetermined pattern may also be irregular patterns as long as the superimposed pattern of the first predetermined pattern and the second predetermined pattern is a pure color spot, which is not limited in this embodiment of the application.

Optionally, in this embodiment of the present application, the fingerprint identification device 300 may further include:

the optical assembly 320, which may specifically include one or more optical lenses, is used to direct or focus the finger-reflected or transmitted light signals into the sensor 310. It should be understood that the optical component 320 may correspond to the optical component 132 in the embodiment shown in fig. 1, and the detailed description may refer to the related description of the foregoing embodiments, which is not repeated herein.

a light source 330 for emitting light signals at the first and second light emitting areas.

Alternatively, as an embodiment, the light source 330 may be a self-luminous display unit of the display screen in the fingerprint detection area, i.e., the light source 330 may be an OLED. Alternatively, the light source 330 may also be an internal light source or an external light source of the fingerprint identification module, which is not limited in the embodiment of the present application.

Alternatively, the light source 330 may emit light signals at the first and second light emitting areas in sequence. At this time, a time interval of the light source 330 emitting the light signal at the first and second light emitting areas may be preset, for example, the preset time interval is 0.5 ms. Alternatively, the time interval during which the light source 330 emits light signals at the first and second light emitting areas may be the time at which the sensor 310 captures the first fingerprint image. That is, the light source 330 emits light signals in the first light emitting area, and the light source 330 can emit light signals in the second light emitting area after the sensor 310 collects the first fingerprint image

a processing unit 340, configured to perform fingerprint identification according to the first image and the third image, and/or according to the second image and the fourth image.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.

When fingerprint identification device 300 is the fingerprint module, processing unit 340 can be the processing unit in the fingerprint module. When the fingerprint recognition device 300 is a terminal device, the processing unit 340 may be a processor in the terminal device.

The processor may be a Central Processing Unit (CPU), or other 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, a discrete gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

Optionally, in an embodiment of the present application, the processing unit 340 may specifically be configured to: splicing the first image and the third image to obtain a first spliced image; and then fingerprint identification is carried out according to the first spliced image. Wherein the first stitched image may be a fingerprint image formed by reflecting the light signals.

It should be understood that the first image and the third image formed according to the sensor pixel set corresponding to the light-emitting region do not contain complete fingerprint detail information, the first image and the third image are spliced, and the spliced image contains complete fingerprint detail information, so that the fingerprint identification performance can be further improved.

Of course, the processing unit 340 may also fuse the first image and the third image, and perform fingerprint recognition according to the fused image. The image fusion method in the embodiment of the present application may adopt any fusion method, for example, a wavelet transform, a gray-scale weighted average method, or a pyramid decomposition fusion method, which is not limited in the embodiment of the present application.

Optionally, in an embodiment of the present application, the processing unit 340 may specifically be configured to: splicing the second image and the fourth image to obtain a second spliced image; and then fingerprint identification is carried out according to the second spliced image. Wherein the second stitched image may be a fingerprint image formed by transmitting light signals.

It should be understood that the second image and the fourth image formed according to the sensor pixel set corresponding to the non-light-emitting region do not contain complete fingerprint detail information, the second image and the fourth image are spliced, and the spliced image can contain complete fingerprint detail information, so that the fingerprint identification performance can be further improved.

Of course, the processing unit 340 may also fuse the second image and the fourth image, and perform fingerprint recognition according to the fused image.

Optionally, in an embodiment of the present application, the processing unit 340 may further be configured to: if the first image and the third image, and/or any group of images in the second image and the fourth image are successfully matched with the fingerprint template, the fingerprint identification can be determined to be completed.

The fingerprint template may be stored in the fingerprint recognition device 300 in advance.

Specifically, the processing unit 340 may match the first stitched image with the fingerprint template, and if the matching is successful, end the identification process. If the matching is not successful, the processing unit 340 matches the second stitched image with the fingerprint template, and if the matching is successful, the identification process is ended. If the matching is still unsuccessful, the fingerprint identification fails. Or

The processing unit 340 may match the second stitched image with the fingerprint template, and if the matching is successful, end the identification process. If the matching is not successful, the processing unit 340 matches the first stitched image with the fingerprint template, and if the matching is successful, the identification process is ended. If the matching is still unsuccessful, the fingerprint identification fails. Or

The processing unit 340 may match the first stitched image and the second stitched image with the fingerprint template at the same time, and may determine that the fingerprint identification is completed as long as any one of the first stitched image and the second stitched image is successfully matched with the fingerprint template.

Optionally, in another embodiment of the present application, the processing unit 340 may further be configured to: the signal intensities of the reflected light signal and the transmitted light signal are compared, and whether fingerprint recognition is performed based on the first image and the third image or based on the second image and the fourth image is determined based on the comparison result.

Specifically, if the signal intensity of the reflected light signal is greater than the signal intensity of the transmitted light signal, the processing unit 340 may perform fingerprint recognition according to the first image and the third image; if the signal intensity of the reflected light signal is less than the signal intensity of the transmitted light signal, the processing unit 340 may perform fingerprint recognition according to the second image and the fourth image; if the signal intensity of the reflected light signal is the same as the signal intensity of the transmitted light signal, the processing unit 340 may perform fingerprint recognition based on the first and third images and based on the second and fourth images.

It should be understood that, in the embodiments of the present application, the terms "first", "second", "third" and "fourth" are merely used to distinguish different objects, and do not limit the scope of the embodiments of the present application.

According to the embodiment of the application, when the fingerprint detection area displays different preset patterns, the sensor collects images formed by sensor pixels corresponding to the light-emitting areas and the non-light-emitting areas which are included by the different preset patterns, and the processing unit conducts fingerprint identification by reusing the images formed by the sensor pixels corresponding to the light-emitting areas and/or the images formed by the sensor pixels corresponding to the non-light-emitting areas, so that the images for identification are added in the fingerprint identification process, and the fingerprint identification performance can be improved. In addition, the image formed by the sensor pixels corresponding to the non-luminous region is utilized for fingerprint identification, the finger can not be in contact with the detection surface, the influence of the contact surface on the fingerprint identification is reduced, and the fingerprint identification performance can be further improved.

The apparatus embodiments of the present application are described in detail above with reference to fig. 3-6, and the method embodiments of the present application are described in detail below with reference to fig. 7 and 8, it being understood that the method embodiments correspond to the apparatus embodiments and that similar descriptions may be had with reference to the apparatus embodiments.

Fig. 7 shows a schematic flow chart of a fingerprint identification method of an embodiment of the present application. The fingerprint recognition method shown in fig. 7 may be performed by the fingerprint recognition device 300 in the foregoing embodiments.

As shown in fig. 7, the fingerprint identification method 700 may include the steps of:

s710, when the fingerprint detection area displays a first predetermined pattern, acquiring a first fingerprint image, where the first fingerprint image includes a first image and a second image, the first predetermined pattern includes a first light-emitting area and a first non-light-emitting area, the first image is an image formed by a first sensor pixel set corresponding to the first light-emitting area, and the second image is an image formed by a second sensor pixel set corresponding to the first non-light-emitting area.

S720, when the fingerprint detection area displays a second predetermined pattern, acquiring a second fingerprint image, wherein the second fingerprint image comprises a third image and a fourth image, the second predetermined pattern comprises a second light-emitting area and a second non-light-emitting area, the third image is an image formed by a third sensor pixel set corresponding to the second light-emitting area, the fourth image is an image formed by a fourth sensor pixel set corresponding to the second non-light-emitting area, the second light-emitting area and the first non-light-emitting area are in the same position, and the second non-light-emitting area and the first light-emitting area are in the same position.

Optionally, in some embodiments, the method 700 may further include: and performing fingerprint identification according to the first image and the third image and/or according to the second image and the fourth image.

Optionally, in some embodiments, performing fingerprint recognition according to the first image and the third image, and/or according to the second image and the fourth image may specifically include: splicing the first image and the third image to obtain a first spliced image; and carrying out fingerprint identification according to the first spliced image.

Optionally, in some embodiments, performing fingerprint recognition according to the first image and the third image, and/or according to the second image and the fourth image may specifically include: splicing the second image and the fourth image to obtain a second spliced image; and performing fingerprint identification according to the second spliced image.

Optionally, in some embodiments, the light signal emitted by the first light-emitting area is transmitted to the first sensor pixel set after being reflected by the finger, and the light signal emitted by the first light-emitting area is transmitted to the second sensor pixel set after being transmitted by the finger;

the light signals emitted by the second light emitting area are transmitted to the third sensor pixel set after being reflected by the finger, and the light signals emitted by the second light emitting area are transmitted to the fourth sensor pixel set after being transmitted by the finger.

Optionally, in some embodiments, the method 700 may further include: the light source is controlled to emit light signals at the first light emitting area and the second light emitting area.

Optionally, in some embodiments, the light source is an organic light emitting diode OLED.

Alternatively, in some embodiments, the first predetermined pattern and the second predetermined pattern may be a circular ring pattern, a stripe pattern, or a checkerboard pattern.

Optionally, in some embodiments, if the first predetermined pattern is a stripe pattern, the first light-emitting area includes a plurality of first stripes, the first non-light-emitting area includes a plurality of second stripes, and the plurality of first stripes and the plurality of second stripes are spaced apart.

Optionally, in some embodiments, the method 700 may further include: when at least one group of the following images is successfully matched with the fingerprint template, determining that the fingerprint identification is finished: the first image and the third image, the second image and the fourth image. Hereinafter, a fingerprint identification method according to an embodiment of the present application will be described in detail with reference to fig. 8.

As shown in fig. 8, when the finger presses the display screen, the light spot 1 and the light spot 2 are time-shared, i.e. the first predetermined pattern and the second predetermined pattern are time-shared in the fingerprint detection area, wherein the light spot 1 and the light spot 2 are complementary. When the light spot 1 is lightened, namely a first preset pattern is displayed in the fingerprint detection area, a first image and a second image are collected; when the light spot 2 is lit, i.e. the fingerprint detection area shows a second predetermined pattern, a third image and a fourth image are acquired. And then, splicing the first image and the third image to obtain a first spliced image, and splicing the second image and the fourth image to obtain a second spliced image. And then, respectively matching the first spliced image and the second spliced image with the fingerprint template, and finishing fingerprint identification if any one of the first spliced image and the second spliced image is successfully matched.

An electronic device 900 is further provided in the embodiment of the present application, as shown in fig. 9, the electronic device 900 may include a display 920 and the fingerprint identification device 910, where the fingerprint identification device 910 may be the fingerprint identification device 300 in the foregoing embodiment, and is disposed below the display 920. As an alternative embodiment, the display 920 has a self-luminous display unit, which can be used as an excitation light source for fingerprint detection of the fingerprint identification device 910. Additionally, the fingerprinting apparatus 910 may be capable of being used to perform the content of the method embodiment shown in fig. 7.

It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application and are not intended to limit the scope of the embodiments of the present application.

It is to be understood that the terminology used in the embodiments of the present application and the appended claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. For example, as used in the examples of this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. 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.

In the several embodiments provided in the present application, it should be understood that the disclosed system and apparatus may be implemented in other manners. 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 also be an electric, mechanical or other form of connection.

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 embodiments of the present application.

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 integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially or partially contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes 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 method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of fingerprint recognition, comprising:

when a fingerprint detection area displays a first preset pattern, acquiring a first fingerprint image, wherein the first fingerprint image comprises a first image and a second image, the first preset pattern comprises a first light-emitting area and a first non-light-emitting area, the first image is formed by a first sensor pixel set corresponding to the first light-emitting area, and the second image is formed by a second sensor pixel set corresponding to the first non-light-emitting area;

2. The method of claim 1, further comprising:

and carrying out fingerprint identification according to the first image and the third image and/or according to the second image and the fourth image.

3. The method of claim 2, wherein the performing fingerprint recognition based on the first image and the third image, and/or based on the second image and the fourth image comprises:

splicing the first image and the third image to obtain a first spliced image;

and performing fingerprint identification according to the first spliced image.

4. A method according to claim 2 or 3, wherein the performing fingerprint recognition from the first image and the third image, and/or from the second image and the fourth image comprises:

splicing the second image and the fourth image to obtain a second spliced image;

and performing fingerprint identification according to the second spliced image.

5. The method according to any one of claims 1 to 3, wherein the light signal emitted by the first light-emitting area is transmitted to the first set of sensor pixels after being reflected by a finger, and the light signal emitted by the first light-emitting area is transmitted to the second set of sensor pixels after being transmitted by the finger;

6. The method according to any one of claims 1 to 3, further comprising:

controlling a light source to emit light signals at the first and second light emitting areas.

7. The method of claim 6, wherein the light source is an Organic Light Emitting Diode (OLED).

8. The method according to any one of claims 1 to 3, wherein the first predetermined pattern and the second predetermined pattern are a circular ring pattern, a stripe pattern, or a checkerboard pattern.

9. The method according to claim 8, wherein if the first predetermined pattern is the stripe pattern, the first light-emitting area includes a plurality of first stripes, the first non-light-emitting area includes a plurality of second stripes, and the plurality of first stripes and the plurality of second stripes are spaced apart.

10. The method according to any one of claims 1 to 3, further comprising:

when at least one group of the following images is successfully matched with the fingerprint template, determining that the fingerprint identification is finished: the first and third images, the second and fourth images.

11. An apparatus for fingerprint recognition, comprising:

12. The apparatus of claim 11, further comprising:

and the processing unit is used for carrying out fingerprint identification according to the first image and the third image and/or the second image and the fourth image.

13. The apparatus according to claim 12, wherein the processing unit is specifically configured to:

splicing the first image and the third image to obtain a first spliced image;

and performing fingerprint identification according to the first spliced image.

14. The apparatus according to claim 12 or 13, wherein the processing unit is specifically configured to:

15. The device according to any one of claims 11 to 13, wherein the light signal emitted from the first light-emitting area is transmitted to the first set of sensor pixels after being reflected by a finger, and the light signal emitted from the first light-emitting area is transmitted to the second set of sensor pixels after being transmitted by the finger;

16. The apparatus according to any one of claims 11 to 13, characterized in that it comprises:

a light source for emitting light signals at the first and second light emitting areas.

17. The device of claim 16, wherein the light source is an Organic Light Emitting Diode (OLED).

18. The apparatus of any one of claims 11 to 13, wherein the first and second predetermined patterns are a circular ring pattern, a stripe pattern, or a checkerboard pattern.

19. The apparatus of claim 18, wherein if the first predetermined pattern is the stripe pattern, the first light-emitting area comprises a plurality of first stripes, the first non-light-emitting area comprises a plurality of second stripes, and the plurality of first stripes and the plurality of second stripes are spaced apart.

20. The apparatus according to claim 12 or 13, wherein the processing unit is further configured to:

21. An electronic device, comprising: the apparatus for fingerprint recognition according to any one of claims 11 to 20.