CN111183429B

CN111183429B - Fingerprint identification method and device and electronic equipment

Info

Publication number: CN111183429B
Application number: CN201980004489.0A
Authority: CN
Inventors: 杨方明; 张玮; 余书宝; 李顺展
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2022-08-30
Anticipated expiration: 2039-07-10
Also published as: WO2021003723A1; CN111183429A

Abstract

A method, a device (130) and an electronic device (10) for fingerprint identification can improve the imaging quality of fingerprints. The fingerprint identification device (130) is suitable for an electronic device (10) with a display screen (120), and comprises a fingerprint sensor (280), a fingerprint detection area (103) of the fingerprint sensor (280) is positioned in the display area of the display screen (120), the fingerprint sensor (280) is used for being arranged below the display screen (120), and for receiving the return light signal and detecting a fingerprint image of the finger (210) from the return light signal, wherein the return light signal comprises a first return light signal (205), the first return light signal (205) is a light signal of the first light signal (201) transmitted into the finger (210) above the fingerprint detection area (103) and transmitted out from the finger (210) and passing through the display screen (120), and an incident angle of the first light signal (201) when reaching the glass cover (220) at the fingerprint detection area (103) is greater than or equal to a total reflection angle of the light signal from the glass cover (220) to the air.

Description

Fingerprint identification method and device and electronic equipment

Technical Field

The embodiment of the application relates to the field of fingerprint identification, and in particular relates to a method and a device for fingerprint identification and an electronic device.

Background

In recent years, smart phones enter a full-screen era, the screen occupation ratio of the smart phones is getting larger and larger, the underscreen fingerprint identification technology is in the trend, the underscreen fingerprint technology is firstly introduced into the business, the optical underscreen fingerprint machine type is released by domestic mainstream mobile phone manufacturers, and new underscreen fingerprint technology machines of international brand manufacturers are also in the research and development of a compact routing and bulging ground.

The existing optical screen lower fingerprint technology is basically applied to self-luminous mobile phone screens such as Organic Light-Emitting diodes (OLEDs) and Active-matrix Organic Light-Emitting diodes (AMOLEDs), and Light rays are irradiated onto fingers and reflected by the fingers, and then received by sensors below the screens through the mobile phone screens and special optical lenses to realize fingerprint image collection and fingerprint identification. However, the fingerprint recognition method using self-luminous screen pixels as light sources has a problem of poor imaging quality.

Disclosure of Invention

The embodiment of the application provides a fingerprint identification method and device and electronic equipment, and the imaging quality of fingerprints can be improved.

In a first aspect, a fingerprint identification device is provided, the fingerprint identification device being suitable for an electronic apparatus having a display screen, the fingerprint identification device comprising a light path guide structure and a fingerprint sensor, a fingerprint detection area of the fingerprint sensor being arranged at a display area of the display screen, the light path guide structure being arranged between the display screen and the fingerprint sensor for guiding a return light signal formed by a finger above the fingerprint detection area to the fingerprint sensor; the fingerprint sensor is arranged below the display screen and comprises a sensing array with a plurality of optical sensing units, the sensing array is used for receiving the return light signals passing through the light path guiding structure and detecting a fingerprint image of the finger according to the return light signals, the return light signals comprise first return light signals, the first return light signals are light signals transmitted into the finger above the fingerprint detection area and transmitted out of the finger and passing through the display screen, and the incident angle of the first light signals when reaching the glass cover plate at the fingerprint detection area is larger than or equal to the total reflection angle of the light signals incident into air from the glass cover plate.

In one possible implementation, the incident angle is greater than or equal to 42.6 °.

In a possible implementation manner, the fingerprint identification device further includes a light emitting component, which is disposed below the non-display area of the display screen, and is configured to emit the first light signal to the fingerprint detection area.

In one possible implementation, the light emitting assembly is disposed in a chin area of the display screen.

In one possible implementation, the light emitting assembly includes a vertical cavity surface emitting laser, and an incident angle of the first light signal emitted by the vertical cavity surface emitting laser when reaching the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

In one possible implementation, the light emitting assembly includes a light source and a lens, and the lens is configured to converge the first light signal emitted by the light source to the fingerprint detection area, so that an incident angle of the first light signal when reaching the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

In a possible implementation manner, the light emitting assembly includes a light source and a shielding member, and the shielding member is configured to shield the light signal emitted by the light source, so that an incident angle of the first light signal emitted by the light source and not shielded by the shielding member when the first light signal reaches the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

In a possible implementation manner, the blocking piece is ink, the ink is coated on the lower surface of the glass cover plate and is arranged on one side, away from the fingerprint detection area, of the light source, and the ink is used for blocking an optical signal emitted by the light source.

In a possible implementation manner, a light source in the light emitting assembly is obliquely arranged relative to the display screen, so that the first light signal emitted by the light source can reach the fingerprint detection area at a preset angle, and an incident angle of the first light signal is greater than or equal to the total reflection angle when the first light signal reaches the glass cover plate at the fingerprint detection area.

In a possible implementation manner, the light emitting assembly includes a light source and a light guide column, and the light guide column is configured to guide the first light signal emitted by the light source to the fingerprint detection area, so that an incident angle when the first light signal passing through the light guide column reaches the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

In a possible implementation manner, the light guide column comprises a first section of light guide column and a second section of light guide column, the first section of light guide column is connected with the second section of light guide column, the first section of light guide column is arranged around the light source, the axial direction of the first light guide column is perpendicular to the display screen, and the axial direction of the second section of light guide column is opposite to the display screen in an inclined manner, so that the light signal passing through the second section of light guide column reaches the incident angle of the glass cover plate at the fingerprint detection area, which is larger than or equal to the total reflection angle.

In a possible implementation manner, the light emitting assembly includes a light source and a light reflecting device, the light source emits a light signal toward the light reflecting device, and the light reflecting device is configured to reflect the light signal emitted by the light source, so that an incident angle when the light signal reflected by the light reflecting device reaches the glass cover plate of the display screen is greater than or equal to the total reflection angle.

In a possible implementation manner, the light reflecting device is arranged on the side surface of the glass cover plate, and the light reflecting surface of the light reflecting device is perpendicular to the surface of the glass cover plate.

In one possible implementation, the light reflecting means is a light reflecting coating or a light reflecting film.

In a possible implementation manner, the first optical signal light emitted by the light emitting component is infrared light or visible light.

In one possible implementation, the wavelength of the infrared light is 940 nm; alternatively, the visible light has a wavelength of 550 nm.

In a possible implementation manner, the distance between the light-emitting component and the fingerprint sensor in the length direction of the display screen is 15 mm-20 mm.

In a possible implementation manner, the light emitting assembly includes a first light source, the display screen includes a first position opposite to a position where the first light source is located, and a second position opposite to a position where the fingerprint sensor is located, and the first position is located at a position where a center of the second position extends along a length direction of the display screen.

In a possible implementation manner, the light emitting assembly includes a first light source, the display screen includes a first position opposite to a position where the first light source is located, and a second position opposite to a position where the fingerprint sensor is located, and the first position is located on one side of a position where a center position of the second position extends along a length direction of the display screen.

In a possible implementation manner, the light emitting assembly includes a second light source and a third light source, the display screen includes a third position opposite to the position of the second light source, a fourth position opposite to the position of the third light source, and a second position opposite to the position of the fingerprint sensor, and the third position and the fourth position are disposed on two sides of a position where a center position of the second position extends along a length direction of the display screen.

In a possible implementation manner, the display screen includes a plurality of self-luminous display units, the self-luminous display units are used for displaying images, and the return light signal further includes a second return light signal, and the second return light signal is a light signal generated by irradiating the finger with a second light signal at least partially emitted from the self-luminous display units and reflecting or scattering the finger.

In one possible implementation, the fingerprint sensor is configured to detect a first fingerprint image of the finger from the first return light signal and also configured to detect a second fingerprint image of the finger from the second return light signal.

In one possible implementation, the wavelength of the second optical signal is 550 nm.

In one possible implementation, the fingerprint identification device further includes a processor configured to: acquiring the first fingerprint image, the first fingerprint image being generated from the first return light signal; when the first fingerprint image is matched with a first preset fingerprint image, determining that fingerprint identification is successful; or when the first fingerprint image is not matched with the first preset fingerprint image, determining that the fingerprint identification fails.

In one possible implementation, the processor is configured to: acquiring the second fingerprint image, the second fingerprint image being generated from the second return light signal; when the first fingerprint image is successfully matched with a first preset fingerprint image and/or when the second fingerprint image is successfully matched with a second preset fingerprint image, determining that the fingerprint identification is successful; or when the first fingerprint image is not matched with the first preset fingerprint image and the second fingerprint image is not matched with the second preset fingerprint image, determining that the fingerprint identification fails.

In a possible implementation manner, the fingerprint identification device further includes a control unit, and the control unit is configured to control the at least part of the self-luminous display unit not to emit the second light signal when the light-emitting component emits the first light signal, and control the light-emitting component not to emit the first light signal when the at least part of the self-luminous display unit emits the second light signal.

In a possible implementation manner, the fingerprint identification apparatus further includes a control unit, and the control unit is configured to control the light emitting assembly not to emit light and control the at least part of the self-light emitting unit to emit the second light signal after the fingerprint sensor collects the data of the first fingerprint image.

In a possible implementation, the optical path guiding structure comprises an optical lens disposed above the fingerprint sensor for converging the return optical signal passing through the display screen to the sensing array of the fingerprint sensor.

In a possible implementation, the first return light signal is infrared light, the second return light signal is visible light, and the optical lens is capable of imaging infrared light and imaging visible light without chromatic aberration.

In a possible implementation manner, the fingerprint identification device further includes an optical filter located above the fingerprint sensor, where the optical filter is configured to filter out other optical signals except the first return optical signal and the second return optical signal.

In a possible implementation manner, the first return light signal is infrared light with a wavelength of 940nm, the second return light signal is visible light with a wavelength of 550nm, and the filter is at least used for filtering out light with wavelengths not equal to 940nm and 550 nm.

In one possible implementation manner, the optical path guiding structure includes an optical collimator having a plurality of collimating units or micro-hole arrays, and the optical collimator is configured to transmit a return optical signal passing through the display screen to corresponding optical sensing units in the sensing array of the fingerprint sensor through the plurality of collimating units or micro-hole arrays, respectively; or, the optical path guiding structure comprises a microlens array with a plurality of microlenses and a light blocking layer with a plurality of micropores, and the microlens array is used for focusing the return light signals passing through the display screen to the micropores corresponding to the light blocking layer respectively and transmitting the return light signals to the corresponding optical sensing units in the sensing array of the fingerprint sensor through the micropores.

The application provides a fingerprint identification device, a fingerprint image is not generated based on the principle of reflection imaging, but generated based on the principle of transmission. This application utilizes the total reflection light as fingerprint identification's light source, because the total reflection takes place for the light signal of valley line department, can not received by fingerprint sensor, and the light signal majority transmission of ridge line department advances the finger to it passes the display screen and is received by fingerprint sensor to transmit out from finger ridge department, and the light signal that ridge and valley department that fingerprint sensor received returned has higher contrast like this, can obtain better formation of image effect.

In a second aspect, an electronic device is provided, comprising: the apparatus for fingerprint recognition in the first aspect or in each possible implementation thereof.

In a third aspect, a method for fingerprint identification is provided, where the method is applicable to the fingerprint identification apparatus in the first aspect or any possible implementation manner thereof, and the method includes: acquiring a first fingerprint image generated from a first return light signal, the first return light signal being a light signal of a first light signal transmitted into and out of a finger above the fingerprint detection area and passing through the display screen, an incident angle at which the first light signal reaches a glass cover at the fingerprint detection area being greater than or equal to a total reflection angle at which the light signal is incident from the glass cover to air; and performing fingerprint identification according to the first fingerprint image.

In a possible implementation manner, the performing fingerprint identification according to the first fingerprint image includes: when the first fingerprint image is matched with a first preset fingerprint image, determining that fingerprint identification is successful; or when the first fingerprint image is not matched with the first preset fingerprint image, determining that the fingerprint identification fails.

In one possible implementation, the display screen includes a plurality of self-light emitting units, and the method further includes: acquiring a second fingerprint image generated from second return light which is an optical signal reflected after a second optical signal is irradiated on the finger, the second optical signal being an optical signal emitted from the light emitting unit at least in part; the fingerprint identification according to the first fingerprint image comprises: and when the first fingerprint image is matched with a first preset fingerprint image and/or the second fingerprint image is matched with a second preset fingerprint image, determining that the fingerprint identification is successful.

In a possible implementation manner, the performing fingerprint identification according to the first fingerprint image includes: and when the first fingerprint image is not matched with the first preset fingerprint image or the second fingerprint image is not matched with the second preset fingerprint image, determining that the fingerprint identification fails.

In one possible implementation, the first optical signal is an optical signal emitted by a light emitting component, and the method further includes: when the light-emitting component emits the first light signal, controlling the plurality of self-luminous display units not to emit the second light signal; and when the plurality of self-luminous display units emit the second light signals, controlling the light-emitting assembly not to emit the first light signals.

In one possible implementation, the first optical signal is an optical signal emitted by a light emitting component, and the method further includes: after the data of the first fingerprint image are collected, the light-emitting assembly is controlled not to emit light, and the self-light-emitting unit is controlled to emit the second light signal.

Drawings

Fig. 1 is a plan view of a structure of an electronic apparatus according to an embodiment of the present application.

Fig. 2 is a side view of the structure of an electronic apparatus according to an embodiment of the present application.

Fig. 3 is a schematic diagram of guiding light paths through collimators according to an embodiment of the present application.

Fig. 4 is a schematic diagram of guiding light through a lens according to an embodiment of the present application.

Fig. 5 is a schematic diagram of the principle of reflection-based imaging according to the embodiment of the present application.

Fig. 6 is a fingerprint image obtained based on reflection imaging according to an embodiment of the present application.

Fig. 7 is a fingerprint image of a dry finger based on reflectance imaging according to an embodiment of the present application.

Fig. 8 is a schematic diagram of an imaging principle when total reflection light is used as a light source according to an embodiment of the present application.

Fig. 9 is a schematic diagram of another imaging principle of the embodiment of the present application when total reflection light is used as a light source.

Fig. 10 is a schematic diagram of a fingerprint recognition device provided in an embodiment of the present application.

Fig. 11 is a schematic diagram of a fingerprint identification process when a self-luminous display screen is used as a light source according to an embodiment of the present application.

Fig. 12 is a schematic structural diagram of a light emitting assembly according to an embodiment of the present disclosure.

Fig. 13 is a schematic structural diagram of another light emitting assembly provided in the embodiment of the present application.

Fig. 14 is a schematic structural diagram of another light emitting assembly provided in the embodiment of the present application.

Fig. 15 is a schematic structural diagram of another light emitting assembly provided in the embodiment of the present application.

Fig. 16 is a schematic structural diagram of another light emitting assembly provided in the embodiment of the present application.

Fig. 17 is a schematic diagram illustrating a position of a light source included in a light emitting assembly according to an embodiment of the present application, the position corresponding to a display screen.

Fig. 18 is a schematic diagram illustrating a position of a light source included in another light-emitting assembly according to an embodiment of the present application, the light source corresponding to a display screen.

Fig. 19 is a schematic diagram illustrating a position of two light sources included in a light emitting assembly according to an embodiment of the present application, the two light sources corresponding to a display screen.

Fig. 20 is a schematic diagram of a fingerprint identification device according to an embodiment of the present application.

Fig. 21 is a schematic diagram of another fingerprint identification device according to an embodiment of the present application.

Fig. 22 is a graph of polychromatic light focus offset of an optical lens provided by an embodiment of the present application.

Fig. 23 is a graph showing transmittance of the optical filter according to the embodiment of the present application for light having different wavelengths.

Fig. 24 is a schematic block diagram of an electronic device provided in an embodiment of the present application.

Fig. 25 is a schematic flowchart of a fingerprint identification method provided in 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 in the embodiment of the present application may be applied to portable or mobile computing devices such as smart phones, tablet computers, and game devices, and other electronic devices such as electronic databases, automobiles, and Automatic Teller Machines (ATMs), but the embodiment of the present application is not limited thereto, and the embodiment of the present application may be applied to other mobile terminals or other electronic devices having display screens; more specifically, in the above electronic device, 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. Alternatively, the fingerprint identification device may be partially or completely integrated into a display screen of the electronic device, so as to form an In-display (In-display) optical fingerprint system.

Fig. 1 and fig. 2 are two schematic structural diagrams of an electronic device to which the embodiment of the present application is applicable, where fig. 1 is a top view and fig. 2 is a side view. The electronic device 10 includes a display 120 and an optical fingerprint device 130, wherein the optical fingerprint device 130 is disposed in a local area below the display 120. The optical fingerprint device 130 comprises an optical fingerprint sensor, which comprises a sensing array 133 having 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 corresponding to 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 region of the electronic device 10, and the optical path is designed to guide the optical signal of at least a part of the display area of the display screen 120 to the optical fingerprint device 130, 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 corresponding to 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, if the light path is guided by, for example, light collimation, the fingerprint sensing area 103 corresponding to the optical fingerprint device 130 may be designed to substantially correspond to the area of the sensing array of the optical fingerprint device 130.

Therefore, when the user needs to unlock or otherwise verify the fingerprint of the electronic device, the user only needs to press the finger on the fingerprint detection area 103 of the display screen 120, so as to input the fingerprint. Since fingerprint detection can be implemented in the screen, the electronic device 10 with the above structure does not need to reserve a 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 substantially extended to the front surface of the whole electronic device 10.

As an alternative implementation, as shown in fig. 2, the optical fingerprint device 130 includes a light detection portion 134 and an optical assembly 132, where the light detection portion 134 includes a sensing array, a reading circuit electrically connected to the sensing array, and other auxiliary circuits, which can be fabricated on a chip (Die) through a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor, where the sensing array is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors can be used as the optical sensing units; 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 ambient light penetrating through the finger, a light guiding layer or a light path guiding structure for guiding light returning from 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, such as attaching the optical component 132 on the chip, or integrating some components of the optical component 132 into the chip.

For example, as shown in fig. 3, the light guide layer of the optical component 132 may be specifically a Collimator (collimater) layer made of a semiconductor silicon wafer, and the light guide layer has a plurality of collimating units or a micro-hole array, and the collimating units may be specifically small holes, so that, in reflected light reflected from a finger, light perpendicularly incident to the collimating units may pass through and be received by an optical sensing unit below the collimating units, and light with an excessively large incident angle is attenuated by multiple reflections inside the collimating units, and therefore each optical sensing unit can 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 having one or more Lens units, such as a Lens group consisting of one or more aspheric lenses, for example, as shown in fig. 4, the optical assembly 132 may include a Lens for converging the reflected light reflected from the finger to the sensing array of the light detecting portion 134 therebelow, so that the sensing array may image 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 the 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-described optical path directing 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 stack structure or optical path thereof may need to be adjusted according to actual needs.

Optionally, 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 a 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 corresponding to the optical fingerprint device 130. That is to say, the fingerprint detection area 103 corresponding to 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.

It should be appreciated that in particular implementations, the electronic device 10 further includes a transparent cover plate 110, otherwise referred to as a transparent protective cover plate 110, and the cover plate 110 may be a glass cover plate or a sapphire cover plate that is positioned over the display screen 120 and covers the front face of the electronic device 10. Because, in the embodiment of the present application, the pressing of the finger on the display screen 120 actually means pressing the cover plate 110 above the display screen 120 or covering the surface of the protective layer covering the cover plate 110.

It should be understood that the display screen 120 in the embodiment of the present application may be 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 at the surface of the finger 140 to form reflected light or scattered light by scattering inside the finger 140.

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 electronic 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 electronic 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 also be disposed below the backlight module, and the backlight module may open a hole or perform other optical designs on diffusion sheets, brightness enhancement sheets, reflection sheets, and other film layers to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint device 130.

In other alternative implementations, the display 120 may also be a non-self-emissive display, such as a liquid crystal display using a backlight; in this case, the optical detection device 130 cannot use the display unit of the display screen 120 as an excitation light source, so that it is necessary to integrate the excitation light source inside the optical detection device 130 or arrange the excitation light source outside the optical detection device 130 to realize optical fingerprint detection, and when the optical fingerprint device 130 uses an internal light source or an external light source to provide the optical signal for fingerprint detection, the detection principle is consistent with the description of the above self-emitting display screen.

It should be understood that the above-described reflected light and scattered light are collectively referred to as reflected light for convenience of description. Because ridges (ridges) and valleys (vally) of the fingerprint have different light reflection capabilities, reflected light 151 from the ridges and the peaks and valleys 152 from the fingerprint have different light intensities, and after passing through the optical assembly 132, 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; 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 electronic device 10.

In particular, fig. 5 shows a schematic diagram based on the principle of reflected light imaging. As shown in fig. 5, it is assumed that the surface of the mobile phone is a glass cover plate, and a finger contacts the surface of the glass cover plate when performing fingerprint identification, wherein a fingerprint ridge of the finger can be in good contact with the surface, and a gap exists between a fingerprint valley of the finger and the surface, and the gap is air.

Further, as shown in fig. 5, it is assumed here that the light I irradiated to the finger through the glass cover plate is uniform. The light I can be a light signal emitted by at least part of self-luminous display units of the display screen, and a light emitting area of the display screen is usually arranged right below a fingerprint detection area, so that the path length of the light signal from the light emitting unit to a finger can be reduced, and more light signals are used for fingerprint detection. Therefore, the incident angle of the optical signal I emitted from the self-luminous display unit to the glass interface is generally small, for example, in the case of the fingerprint recognition device shown in fig. 3, the optical signal received by the fingerprint sensor is generally the optical signal of the optical signal with the incident angle smaller than 10 ° returned by the finger, and in the case of the fingerprint recognition device shown in fig. 4, the optical signal received by the fingerprint sensor is generally the optical signal of the optical signal with the incident angle smaller than 30 ° returned by the finger.

According to the optical refraction and reflection law, when the light I irradiates to the finger, the fingerprint ridge line is well contacted, and the refractive index of the finger is similar to that of the glass cover plate, so that the light I absorbed by the finger _T1 Much, and the reflected light I _R1 Less; however, since there is an air gap at the valley line and the difference in refractive index between air and the glass cover plate is large, the light I refracted into the finger _T2 Less reflected light I reflected on the surface of the glass cover plate _R2 More so as to form a contrast signal between fingerprint ridges and valleys, and a reflected signal I at valleys _R2 Stronger, reflected signal I at the ridge line _R1 The fingerprint sensor, being weak, can form a fingerprint image, for example, a fingerprint image as shown in fig. 6, by the difference of signals at the valleys and the ridges.

However, in practical applications, optical fingerprints using reflective imaging have a problem of finger dryness in principle, and therefore, there may be a case where the fingerprint image is not clear. Dry fingers mean that the surface of the fingers has less grease and sweat, for example, at present, about 10% -20% of people are dry fingers, and in addition, common people can also be converted into dry fingers in special scenes, such as after washing hands or under a low temperature state, so that the fingers can be dried.

The finger has less grease and sweat, which affects the refractive index of the finger, resulting in increased difference between the refractive index of the finger and the refractive index of the glass, and when light I irradiates the finger, the light signal I absorbed by the fingerprint ridge line _T1 Less, but reflected optical signal I _R1 Increasing; the optical signal reflected at the valley line is substantially unchanged, which results in an optical signal I at the ridge line due to an increase in the optical signal reflected at the ridge line _R1 And optical signal I at the valley line _R2 The contrast of the fingerprint image is reduced, and the phenomenon that the fingerprint image is not clear is caused. For example, as shown in fig. 7, in the dry finger state, the optical fingerprint cannot obtain a good signal, and the fingerprint image is quite unclear, which results in a serious decrease in the success rate of unlocking.

Therefore, the embodiment of the application provides a fingerprint identification device, which can improve the success rate of fingerprint identification.

The fingerprint identification device is suitable for electronic equipment with a display screen, and the device can comprise a fingerprint sensor, wherein a fingerprint detection area of the fingerprint sensor is positioned in a display area of the display screen so as to form fingerprint identification under the screen. The fingerprint sensor is configured to receive a return light signal and generate a fingerprint image of the finger based on the return light signal.

Wherein the return light signal may include a first return light signal that is a light signal that the first light signal passes through and is transmitted from a finger above the fingerprint detection area, and an incident angle at which the first light signal reaches the glass cover at the fingerprint detection area is greater than or equal to a total reflection angle at which the light signal is incident from the glass cover to air.

The first optical signal in the embodiments of the present application may also be referred to as a totally reflected optical signal. The first optical signal is a directional optical signal, and the first optical signal may be an optical signal emitted toward the fingerprint acquisition area at a predetermined angle. The first optical signal may be an optical signal emitted by an external light source, or an optical signal emitted by a self-luminous display unit in a self-luminous display screen, as long as the emitted optical signal is a totally reflected optical signal.

The display screen in the embodiment of the present application may be a self-luminous display screen, such as an OLED display screen, or may be a passive luminous display screen, such as a Liquid Crystal Display (LCD) screen.

The fingerprint sensor in the embodiment of the application can comprise a sensing array with a plurality of optical sensing units, and the sensing array is used for receiving a return light signal passing through the light path guiding structure and detecting a fingerprint image of a finger according to the return light signal.

As shown in fig. 8, when the first optical signal L reaches the glass cover plate, the first optical signal L is totally reflected at the valley due to the gap between the fingerprint valley line and the glass cover plate. Because the density of the fingerprint is greater than the density of the air, the total reflection angle of the optical signal from the glass cover plate to the ridge line of the finger is greater than the total reflection angle of the optical signal from the glass cover plate to the air.

As shown in fig. 8, the reflected light L at the ridge line _R1 And reflected light L at the valley line _R2 Total reflection occurs on the upper and lower surfaces of the glass cover plate and is finally attenuated. Transmitted light L at ridge line _T1 After entering the finger, the light is transmitted out of the finger to form a first return light signal, and the first return light signal is received by the fingerprint sensor below the display screen after passing through the display screen. The fingerprint sensor performs fingerprint recognition based on the received first return light signal.

Because the optical signals at the valley lines are totally reflected, the fingerprint sensor can hardly receive the optical signals returned at the valley lines, most of the optical signals at the ridge lines can be transmitted into the finger and then transmitted out of the finger to be received by the fingerprint sensor, and therefore the fingerprint sensor can perform fingerprint identification according to the intensity difference of the optical signals at the ridges and the valleys.

In the conventional fingerprint recognition method, reflected light at ridges and valleys is used for imaging, and as shown in fig. 5, the reflected light I _R1 And reflected light I _R2 The contrast difference of (a) is about 1: 40. Different from the traditional fingerprint identification mode, the embodiment of the application does not utilize transmitted light to image, the contrast ratio of optical signals at the positions of the valleys and the ridges is about 1:200, so that the transmitted light is used for imaging, signals which are 5 times of those of the traditional reflected light imaging can be obtained, better imaging quality can be obtained, and the success rate of fingerprint identification can be improved.

In addition, in the traditional scheme, when the finger is dry, the reflected light at the ridge and the valley is close, so that the fingerprint image is not clear. According to the technical scheme, even if the finger is a dry finger, the light signal can still be transmitted into the ridge, the light signal transmitted from the ridge can be received by the fingerprint sensor, the light signal at the valley can be totally reflected and cannot be received by the fingerprint sensor, and therefore the light signal returned from the ridge and the valley still has high contrast, so that transmitted light imaging is adopted, and the influence of the dry finger is small.

In the embodiment of the present application, the incident angle at which the first optical signal reaches the glass cover plate at the fingerprint detection area is greater than or equal to 42.6 °.

The fingerprint recognition device may further include a light path guide structure disposed between the display screen and the fingerprint sensor for guiding a return light signal formed by the finger above the fingerprint detection area to the fingerprint sensor.

The optical path directing structure may comprise an optical lens, an optical collimator or a microlens array. The optical path directing structure may be, for example, the collimator array and optical lens of fig. 3 and 4.

The fingerprint identification device according to the embodiment of the present application will be described with reference to the following embodiments.

As shown in fig. 9, the light source 260 can be used to emit a total reflection light signal, such as the first light signal 201, the total reflection light signal 203 of the first light signal 201 at the valley and the reflection light signal 204 at the valley continuously perform total reflection on the upper and lower surfaces of the glass cover plate 220, and finally be attenuated. The first optical signal 201 is refracted at the valley, the refracted optical signal is transmitted into the finger, the optical signal transmitted by the finger is the optical signal 205, and the optical signal 205 passes through the glass cover plate 220 and the like and is finally received by the fingerprint sensor below the display screen.

The fingerprint recognition device may comprise a fingerprint sensor 280, the fingerprint sensor 280 being configured to receive a first return optical signal 205, the first return optical signal 205 being an optical signal transmitted by a first optical signal 202 into a finger 210 through a fingerprint ridge and then transmitted out from the finger 210, an incident angle θ of the first optical signal 201 incident on the glass cover 220 where the finger is pressed being greater than or equal to a total reflection angle of the optical signal from the glass cover to air.

It is understood that the incident angle of the first light signal 201 reaching any position of the fingerprint acquisition area may be greater than or equal to the total reflection angle, for example, the incident angle of the first light signal reaching an edge position of the fingerprint detection area is greater than the total reflection angle, and the incident angle of the first light signal reaching the position of the fingerprint detection area close to the light source is greater than or equal to the total reflection angle. Alternatively, the angle of incidence of the first light signal upon reaching the partial fingerprint acquisition area may be greater than or equal to the angle of total reflection, e.g. the angle of incidence of the first light signal upon reaching the central area of the fingerprint acquisition area may be greater than or equal to the angle of total reflection.

The fingerprint recognition device shown in fig. 9 may further include a conductive glass 230 and a polarizer 240 between the glass cover 220 and the display layer 250.

The fingerprint recognition device in the embodiment of the present application may further include an optical lens 270 for focusing the optical signal 205 onto the fingerprint sensor 280.

The fingerprint sensor 280 in the embodiment of the present application may be disposed inside an electronic device, wherein the electronic device may be the electronic device 10 described above. For example, the fingerprint sensor 280 may be disposed on the front or back of the electronic device, or may be disposed below the display screen of the electronic device, or disposed around the display screen, e.g., at the bottom of the display screen.

For convenience of explanation, the embodiment of the present application is described by taking an example in which the optical fingerprint sensor is disposed below a display screen of an electronic device. Correspondingly, when a finger performs fingerprint identification, the finger touches the upper part of the display screen, that is, the fingerprint sensor is a fingerprint sensor under the screen.

It should be understood that the fingerprint sensor 280 of the embodiment of the present application may correspond to the light detection portion 134 in the electronic device 10, and therefore, for brevity, will not be described again.

The fingerprint recognition device may further include a light emitting assembly 260, the light emitting assembly 260 being disposed below the non-display area of the display screen for emitting a first light signal to the fingerprint detection area. The light emitting assembly 260 may be disposed, for example, below an edge region of the glass cover plate 220. As a preferred implementation, the light emitting assembly 260 may be disposed under a glass cover plate in the chin area of the electronic device.

The position of the conductive glass 230 and the polarizer 240 with respect to the light emitting element 260 may be determined by referring to the relationship between the display layer 250 and the light emitting element 260. Specifically, the light emitting element 260 is located at the edges of the conductive glass 230 and the polarizer 240; the light emitting element 260 and the conductive glass 230 are not shielded from each other; the light emitting element 260 and the polarizer 240 are not shielded from each other.

As shown in fig. 10, the glass cover 310 is used for finger touch, the fingerprint detection area 330 is disposed on the glass cover 310, and the light source 320 is disposed below the edge area of the glass cover 310, wherein the incident angle θ of the conceptual burst signal emitted by the light source 320 when incident on the upper surface of the glass cover 310 at the fingerprint detection area 330 is greater than or equal to the total reflection angle of glass to air.

The light emitting assembly may emit a first light signal at a preset angle toward the fingerprint detection area such that an incident angle of the first light signal when reaching the glass cover plate of the fingerprint detection area is less than the total reflection angle.

The first light signal emitted by the light emitting component can be visible light or invisible light. The invisible light may be, for example, infrared light. The invisible light is used as the light source for fingerprint identification, so that a user cannot perceive light signals on a screen of a non-display area, and the user experience can be improved.

The wavelength of infrared light emitted from the light emitting assembly may be 940nm, or alternatively, the wavelength of visible light emitted from the light emitting assembly may be 550 nm.

In the conventional fingerprint recognition device, the self-luminous display screen, such as an OLED screen, adopts the self-luminous display unit as a light source for fingerprint recognition, and when a user presses a finger on the screen, data collection needs to wait for a light spot to light up, as shown in fig. 11. The OLED screen needs 50ms to 100ms to light the light spot, and then the fingerprint sensor can collect fingerprint data. Generally, the finger is pressed for unlocking by one touch, the pressing time of the finger is short and is about 150 ms-200 ms, so that a long time elapses from the time when the user presses the screen to the time when the light spot lights up, the time for collecting data by the fingerprint sensor is short, and when the finger is touched for unlocking, the finger may leave without collecting the data, so that the unlocking failure is caused, and the user experience is poor.

The embodiment of the application adopts the external light source as the light source of fingerprint identification, and the external light source only needs shorter time to give out light, so that more time of the fingerprint sensor can be reserved for collecting fingerprint data, and the user can carry out fingerprint identification by touching lightly, thereby being beneficial to improving the success rate of fingerprint identification and improving the user experience.

The structure of the light emitting assembly can be varied and is described in detail below in conjunction with fig. 12-16.

As shown in fig. 12, the light emitting assembly may include a light source 320, the light source 320 may be a laser, and since the laser may emit a directional light signal, the laser is used as the light source, so that a total reflection light signal is easily achieved.

In addition, the light emitting device may include a Vertical Cavity Surface Emitting Laser (VCSEL) because the VCSEL has a more directional property.

According to the embodiment of the application, the VCSEL can be obliquely installed, so that total reflection angle light can be better obtained. As shown in fig. 12, the VCSEL may be obliquely installed, and the oblique installation of the VCSEL may be understood as that the optical signal 301 emitted from the VCSEL is inclined with respect to the display screen, so that the VCSEL emits light toward the fingerprint detection region, the utilization rate of the optical signal emitted from the VCSEL is improved, most of the optical signal emitted from the VCSEL can reach the fingerprint detection region, and the incident angle of the optical signal 301 emitted from the VCSEL when reaching the upper surface of the glass cover plate 310 of the fingerprint detection region 330 is greater than or equal to the total reflection angle from glass to air.

The light emitting assembly may further include a supporting frame 340 for the VCSEL, the VCSEL is disposed in the supporting frame 340, and the mounting of the VCSEL in a tilt is understood to mean that the supporting frame 340 is mounted in a tilt.

Fig. 13 shows another structure of a light emitting module. The light emitting assembly may include a light source 320 and a lens 350 for focusing the light signal emitted by the light source 320 to the fingerprint detection area 330 such that the incident angle of the light signal reaching the upper surface of the glass cover plate 310 at the fingerprint detection area 330 is greater than or equal to the total reflection angle of glass to air.

The light source 320 may be, for example, a Light Emitting Diode (LED) lamp, or may be another light source, such as a laser.

The light emitting assembly shown in fig. 12 may also be obliquely disposed, so that the light emitting assembly emits light toward the fingerprint detection area 330, most of the light signals emitted by the light emitting assembly can reach the fingerprint detection area 330, and the utilization rate of the light signals emitted by the light source 320 is improved.

The light emitting assembly is obliquely installed, which may be understood as an optical axis of the lens 350 obliquely installed with respect to the glass cover plate 310, the optical axis of the lens 350 is, for example, obliquely inclined toward the fingerprint detection area 330, so that the light signal converged by the lens 350 is transmitted toward the fingerprint detection area 330.

The light emitting assembly may further include a support frame 340, the light source 320 and the lens 350 may be disposed in the support frame 340, and the inclined installation of the light emitting assembly may also be understood as the inclined installation of the support frame 340.

Fig. 14 shows a structure of another light emitting assembly. The light emitting assembly may include a light source 320 and a shielding member 360, the shielding member 360 is used for shielding the light signal emitted by the light source 320, so that the incident angle of the first light signal emitted by the light source 320 and not shielded by the shielding member when the first light signal reaches the glass cover plate 310 of the fingerprint detection area 330 is greater than or equal to the total reflection angle of glass to air.

The light source can be an LED lamp or a laser.

The blinder 360 can be formed by coating a light absorbing layer on a part of the surface of the light source 320 so that the incident angle of the light signal emitted from the uncoated surface reaching the glass cover plate 310 of the fingerprint detection area 330 is greater than or equal to the total reflection angle of glass to air.

The shielding member 360 may also be formed by coating a light absorbing layer on the lower surface of the glass cover plate 310, and the light absorbing layer is disposed on the side of the light source 320 far away from the fingerprint detection area 330, so as to reduce the light quantity leaked from the light source 320 to the non-display area, and improve user experience.

The shielding member 360 may be ink or other light absorbing material, for example.

The light emitting assembly may further include a supporting frame 340, the light source 320 may be disposed in the supporting frame 340, and the supporting frame 340 may be disposed parallel to the glass cover plate 310, as shown in fig. 14, or disposed obliquely with respect to the glass cover plate 310, as shown in fig. 12 and 13, which is not limited in this embodiment.

Fig. 15 shows another structure of a light emitting assembly, which may include a light source 320 and a light guide pillar 370, wherein the light source 320 may be disposed in the light guide pillar 370, and the light guide pillar 370 is used to guide a light signal emitted from the light source 320 to the fingerprint detection area 330, such that an incident angle of the first light signal passing through the light guide pillar 370 reaching the upper surface of the glass cover plate 310 of the fingerprint detection area 330 is greater than or equal to a total reflection angle of glass to air.

The light source 320 may be an LED lamp or a laser.

As shown in FIG. 15, the light guide column 370 can include a first section of light guide column 370-1 and a second section of light guide column 370-2, wherein the first section of light guide column 370-1 is connected to the second section of light guide column 370-2, and the axial direction of the second section of light guide column 370-2 is inclined with respect to the axial direction of the first section of light guide column 370-1. For example, the first light guide column 370-1 is disposed around the light source 320 and has an axial direction perpendicular to the surface of the glass cover plate 310, and the second light guide column 370-2 has an axial direction inclined with respect to the glass cover plate 310 and an axial direction inclined toward the fingerprint detection area 330, so that the light signal passing through the second light guide column 370-2 can be transmitted toward the fingerprint detection area 330, and the incident angle of the light signal passing through the second light guide column 370-2 reaching the upper surface of the glass cover plate 310 at the fingerprint detection area 330 is greater than or equal to the total reflection angle from glass to air.

Of course, the light guide column may also include only one section of light guide column, the light source 320 is disposed in the middle of the light guide column, the axial direction of the section of light guide column is inclined relative to the glass cover plate 310, and the axial direction of the section of light guide column is inclined towards the fingerprint detection area 330, so that the light signal passing through the light guide column is transmitted towards the fingerprint detection area 330, and the incident angle of the light signal passing through the light guide column reaching the upper surface of the glass cover plate 310 at the fingerprint detection area 330 is greater than or equal to the total reflection angle from the glass to the air.

Fig. 16 shows a schematic structural diagram of another light-emitting assembly, which includes a light source 320 and a light reflecting device 380, the light source 320 emits a light signal toward the light reflecting device 380, the light reflecting device 380 is used for reflecting the light signal emitted by the light source 320, the light signal 303 reflected by the light reflecting device 380 is transmitted toward the fingerprint detection area 330, and the incident angle of the light signal 303 reflected by the light reflecting device 380 reaching the upper surface of the glass cover plate 310 at the fingerprint detection area 330 is greater than or equal to the total reflection angle of glass to air, so as to form total reflection light.

As shown in fig. 16, the light reflecting means 380 may be provided at a side of the glass cover plate 310, and particularly, may be provided at a side of an edge position of the glass cover plate 310. The reflective surface of the reflective device 380 may face the fingerprint detection area 330, and the reflective surface of the reflective device 380 may be perpendicular to the surface of the glass cover 310.

The light reflecting means 380 may comprise, for example, a light reflecting coating or a light reflecting film. The reflective coating may be coated on the side of the glass cover plate 310, or the reflective film may be attached to the side of the glass cover plate 310.

The light source 320 may be a common light source, such as an LED, or may also be a laser, which is not specifically limited in this embodiment of the present application.

The light emitting assembly may be disposed at any position below the non-display area of the display screen, which is not particularly limited in this embodiment of the application. The position setting of the light emitting elements is described below with reference to specific embodiments.

As one implementation mode, the distance between the light-emitting component and the fingerprint sensor in the length direction of the display screen can be 15 mm-20 mm. As shown in FIGS. 17-19, m ₁ The length of (A) is 15 mm-20 mm.

The light emitting assembly may include one light source or a plurality of light sources, and when the light intensity of one light source is insufficient, the light intensity may be increased by the plurality of light sources.

The light assembly may comprise a first light source and the display 410 comprises a first position 401 opposite to the position of the first light source and a second position 402 opposite to the position of the fingerprint sensor. For convenience of description, the position arrangement of the light emitting components is described below using the first position 401 and the second position 402.

Fig. 17 shows a schematic view of the position of a light source included in the light assembly relative to the display screen 410. The first position 401 may be disposed at a position where the center of the second position 402 extends along the length direction of the display screen 410, that is, a line connecting the center of the first position 401 and the center of the second position 402 is parallel to the side edge of the display screen 410, or a line connecting the center of the first position 401 and the center of the second position 402 is perpendicular to the lower edge of the display screen 410.

Preferably, the distance between the center of the first location 401 and the second location 402 is 15mm to 20 mm.

The first location 401 may also be disposed to one side of the second location 402 if there is structural interference, as shown in fig. 18, or the first location 401 may be disposed to an edge location on both sides of the display screen 410, or the like.

If the light intensity of one light source is not sufficient, a plurality of light sources may be used as the light source for fingerprint recognition, for example, two light sources may be used as the light source for fingerprint recognition. The layout of the two light sources can be as shown in fig. 19.

The light emitting assembly may comprise a second light source and a third light source, and the display screen comprises a third position 403 opposite to the position of the second light source, a fourth position 404 opposite to the position of the third light source, and a second position 402 opposite to the position of the fingerprint sensor, wherein the third position 403 and the fourth position 404 may be disposed at two sides of a position where a central position of the second position 402 extends along a length direction of the display screen 410.

The third position 403 and the fourth position 404 may be symmetrically distributed on both sides of the position where the center position of the second position 402 extends along the length direction of the display screen 410, or asymmetrically distributed on both sides of the position where the center position of the second position 402 extends along the length direction of the display screen 410.

Of course, if there is structural interference, the third position 403 and the fourth position 404 may also be arranged on the same side of the second position 402 as the position extending in the length direction of the display screen 410.

The scheme that the external light source is used as the light source for fingerprint identification is described above, and the embodiment of the application can be compatible with the traditional fingerprint identification scheme on the basis, namely, the light signal emitted by the self-luminous unit is used for fingerprint identification, so that the success rate of fingerprint identification is improved.

The display screen may include a plurality of self-luminous display units, which may also be understood as light-emitting pixel points, which may be used to display images. The return light signal received by the fingerprint sensor may include a second return light signal, and the second return light signal may be a light signal generated by irradiating the finger with the second light signal emitted from the self-luminous display unit and being reflected or scattered by the finger.

The second optical signal may be an optical signal emitted by the light spot described above, and the embodiment of the application may perform fingerprint identification by using a difference between light intensities of the second return optical signal at the ridge and the valley.

The second optical signal may be visible light, which may have a wavelength of 550nm, or the second optical signal may be an optical signal of another wavelength.

In the embodiment of the present application, the fingerprint sensor may detect a first fingerprint image of a finger from the first return light signal and may detect a second fingerprint image of the finger from the second return light signal.

It will be appreciated that the first fingerprint image is generated on the basis of the principle of transmission imaging and the second fingerprint image is generated on the basis of the principle of reflection imaging, differently.

The first fingerprint image is generated by irradiating the finger with the total reflection light, as described above, so that the light intensity at the ridge in the first fingerprint image is brighter, and the light intensity at the valley is darker; and the second fingerprint image is mainly generated according to the reflected light at the ridges and the valleys, so that the light intensity at the valleys in the second fingerprint image is brighter, and the light intensity at the ridges is darker.

It should be understood that the fingerprint identification device according to the embodiment of the present application may obtain the first fingerprint image and/or the second fingerprint image correspondingly, and therefore, in the fingerprint identification process, according to different application scenarios, the identification according to the first fingerprint image and/or the second fingerprint image may be selected.

The fingerprint identification device in the embodiment of the present application may further include a processor, and the processor may be configured to acquire the first fingerprint image and/or the second fingerprint image, and then perform fingerprint identification according to the first fingerprint image and/or the second fingerprint image.

As one example, the processor may be operative to acquire a first fingerprint image generated from the first return light signals. The processor is further configured to determine that the fingerprint identification is successful when the first fingerprint image matches the first preset fingerprint image; or when the first fingerprint image is not matched with the first preset fingerprint image, determining that the fingerprint identification fails.

The first preset fingerprint image can be a fingerprint image recorded by a user in a fingerprint registration process and serves as a fingerprint template for subsequent fingerprint identification. In addition, the first preset fingerprint image can be updated in the subsequent fingerprint identification process, so that the success rate of fingerprint identification is improved.

As yet another example, the processor may be operative to acquire a second fingerprint image generated from the second return light signal. The processor is further used for determining that the fingerprint identification is successful when the second fingerprint image is matched with the second preset fingerprint image; or when the second fingerprint image is not matched with the second preset fingerprint image, determining that the fingerprint identification fails.

The second preset fingerprint image can be a fingerprint image which is input by a user in the fingerprint registration process and is used as a fingerprint template for subsequent fingerprint identification. In addition, the second preset fingerprint image can be updated in the subsequent fingerprint identification process, so that the success rate of fingerprint identification is improved.

As another example, in the process of performing fingerprint identification by using two light sources, the processor is configured to obtain a first fingerprint image and a second fingerprint image, and determine that fingerprint identification is successful when the first fingerprint image is successfully matched with the first preset fingerprint image and/or when the second fingerprint image is successfully matched with the second preset fingerprint image; or when the first fingerprint image is not matched with the first preset fingerprint image and the second fingerprint image is not matched with the second preset fingerprint image, determining that the fingerprint identification fails.

Therefore, in the process of fingerprint identification by adopting two light sources, as long as at least one of the first fingerprint image and the second fingerprint image is successfully matched, the success of fingerprint identification can be confirmed, and the success rate of fingerprint identification can be improved.

The fingerprint recognition device may further include a control unit operable to control the light emitting assembly and the self-luminous display unit to emit light. Specifically, the control unit may be configured to control the light emitting assembly and the self-luminous display unit to emit light, respectively, that is, the control unit may be configured to control the light emitting assembly and the self-luminous display unit to emit light at different times.

Because the fingerprint images generated according to the first optical signal and the second optical signal are different, the control unit can respectively control the light-emitting component and the self-luminous display unit to emit light, and therefore interference on fingerprint imaging cannot be caused.

For example, the control unit may be configured to control at least a part of the self-light-emitting display unit not to emit the second light signal when the light-emitting assembly emits the first light signal, so that the fingerprint sensor only receives the first return light signal corresponding to the first light signal without being influenced by the second return light signal; the control unit can also control the light-emitting component not to emit the first light signal when at least part of the self-light-emitting display unit emits the second light signal, so that the fingerprint sensor only receives the second return light signal corresponding to the second light signal and is not influenced by the first return light signal.

For another example, the control unit may control the light emitting assembly not to emit light after the fingerprint sensor collects the data of the first fingerprint image, that is, control the light emitting assembly to turn off the light source, and control at least part of the self-light emitting display unit to emit the second light signal. Like this, first light signal and the seamless switching of second light signal are favorable to practicing thrift the required time of fingerprint sensor collection data, also can reduce the time that the user pressed the screen, improve user experience.

As a simple implementation manner, the control unit can immediately control the light emitting assembly to emit the first light signal when the finger presses the screen, and control the light emitting assembly to turn off the light source and control the self-luminous display unit to emit the second light signal after a preset time length after the finger presses the screen.

In this application embodiment, the treater can be when fingerprint sensor gathers the second fingerprint image, and the parallel fingerprint identification that carries out to first fingerprint image to practice thrift fingerprint identification's whole time.

This application embodiment can set up fingerprint sensor in the below of display screen, specifically, can set up the fingerprint identification module in the below of display screen, and this fingerprint identification module can include fingerprint sensor.

The fingerprint recognition module may correspond to the fingerprint recognition device 130 shown in fig. 1 to 4, and for brevity, will not be described herein again.

This fingerprint identification device can also include light path guide structure, and specifically, the fingerprint identification module of display screen below can include light path guide structure. The optical path guiding structure is disposed above the fingerprint sensor for guiding the return optical signal to the fingerprint sensor.

The optical path guiding structure may correspond to the optical component 132 in the electronic device 10, for example, may correspond to the optical path guiding structure in the optical component 132, and for brevity, will not be described herein again.

The optical path directing structure may include an optical lens, an optical collimator, or a microlens layer.

The structure of the fingerprint recognition module is described below by taking an optical lens as an example.

Fig. 20 and 21 show two structures of the fingerprint recognition module, the optical lens in fig. 20 includes one layer of optical lens, and the optical lens in fig. 21 includes two layers of optical lenses.

The two-layered optical lens requires a shorter exposure time than the one-layered optical lens, and thus if two light sources are used for separate imaging, such as an external light source for generating a first fingerprint image and a self-luminous display unit as a light source for generating a second fingerprint image, the fingerprint module shown in fig. 21 can be preferably used.

If the optical path directing structure includes a microlens layer, two microlens layers may also be employed to reduce the exposure time.

However, the fingerprint recognition module shown in fig. 20 can also be used for two light sources to image respectively, and although a longer exposure time may be required, the manufacturing cost of one layer of optical lens is lower.

If two light sources are used for imaging, the optical lens 308 needs to be designed reasonably. The ordinary optical lens may have image chromatic aberration for light of different wavelength bands, and the optical lens 308 in the embodiment of the present application needs to image light signals of two wavelength bands without image chromatic aberration.

For example, in the case where the first return light signal is infrared light and the second return light signal is visible light, the optical lens 308 needs to be designed appropriately so that the optical lens 308 can image infrared light and can image visible light without chromatic aberration. That is, the image chromatic aberration design of the optical lens 308 is compatible with the wavelength light imaging of the visible light band and the infrared band, and ensures that the imaging is better on both the visible light band and the infrared band.

For example, fig. 22 shows an optical lens 308. Fig. 22 shows a plot of the polychromatic light focus offset for optical lens 308. As shown in fig. 22, it is assumed here that the first return light signal is infrared light, and the wavelength is selected to be 940 nm; the second return light signal is visible light with a wavelength of 550nm, and the focal position of the optical lens 308 can be determined to avoid chromatic aberration of the image.

Further, referring to fig. 20 and 21, the optical path guiding structure may further include a filter 306. The filter 306 is used for filtering interference of other optical signals except the first return optical signal and the second return optical signal to reduce interference of ambient stray light.

Conventional filters are generally directed to a single wavelength, but the filter 306 of the embodiment of the present application may be specially designed to transmit two specific wavelength bands, i.e., visible light and infrared light.

For example, fig. 23 shows a graph of the transmittance of the filter 306 for light of different wavelengths. As shown in fig. 23, it is assumed here that the first return light signal is infrared light, and the wavelength is selected to be 940 nm; the second return light signal is visible light, the wavelength is 550nm, the transmittance of the filter 306 for the two wavelengths is much higher than that of the light with other wavelengths, that is, the filter 306 can be used to filter the light with other wavelengths.

Optionally, the optical fingerprint identification module in this application embodiment may also include other structures. For example, as shown in fig. 20 and 21, the optical fingerprint identification module may further include a Flexible Printed Circuit (FPC) 305 and a frame 307, and the embodiment of the present invention is not limited thereto. For another example, the optical fingerprint identification module may further include a processor configured to generate the first return light signal into a first fingerprint image. Wherein the processor may be disposed on the FPC 305.

Optionally, the optical path guiding structure in the embodiment of the present application may include an optical collimator having a plurality of collimating units or micro-hole arrays, and the optical collimator is configured to transmit the return optical signal passing through the display screen to corresponding optical sensing units in the sensing array of the fingerprint sensor through the plurality of collimating units or micro-hole arrays, respectively.

Optionally, the optical path guiding structure in the embodiment of the present application may include a microlens array having a plurality of microlenses and a light blocking layer having a plurality of micropores, where the microlens array is configured to focus the return light signals passing through the display screen to the micropores corresponding to the light blocking layer, respectively, and transmit the return light signals to the corresponding optical sensing units in the sensing array of the fingerprint sensor through the micropores.

Fingerprint identification device in this application embodiment can be the fingerprint module, also can be the electronic equipment including the display screen.

As shown in fig. 24, embodiments of the present application also provide an electronic device 2500, where the electronic device 2500 may include any one of the fingerprint identification devices 2510 described above. The electronic device 2500 may also include a display screen, which may be a self-emissive display screen, such as an OLED display screen, or a non-self-emissive display screen, such as an LCD screen.

Fig. 25 is a schematic flowchart of a method for fingerprint identification according to an embodiment of the present application. The method is suitable for use in any of the fingerprint recognition devices described above, and corresponding features in the method of fig. 25 may be found in the description above. The method includes steps S510-520.

And S510, acquiring a first fingerprint image, wherein the first fingerprint image is generated according to a first return light signal, the first return light signal is a light signal of a first light signal which is transmitted into a finger above the fingerprint detection area, is transmitted out of the finger and passes through the display screen, and the incident angle of the first light signal when reaching the glass cover plate at the fingerprint detection area is larger than or equal to the total reflection angle of the light signal when entering air from the glass cover plate.

And S520, carrying out fingerprint identification according to the first fingerprint image.

The fingerprint recognition method in the embodiment of the present application may be various.

As an example, it may be determined that the fingerprint identification was successful in case the first fingerprint image match was successful.

For example, it may be determined that fingerprint recognition is successful in the case where the first fingerprint image matches the first preset fingerprint image; and under the condition that the first fingerprint image is not matched with the first preset fingerprint image, determining that the fingerprint identification is unsuccessful.

As still another example, it is also possible to acquire a second fingerprint image generated from second return light which is an optical signal reflected after the second optical signal irradiates the finger and which is an optical signal at least partially emitted from the light emitting display unit, and perform fingerprint recognition from the first fingerprint image and the second fingerprint image, and confirm that fingerprint recognition is successful as long as at least one of the first fingerprint image and the second fingerprint image is successfully matched.

For example, it may be determined that the fingerprint identification is successful in the case where the first fingerprint image matches the first preset fingerprint image, and/or the second fingerprint image matches the second preset fingerprint image; and under the condition that the first fingerprint image is not matched with the first preset fingerprint image and the second fingerprint image is not matched with the second preset fingerprint image, determining that the fingerprint identification is unsuccessful.

Optionally, the first optical signal is an optical signal emitted by the light emitting assembly, and the method may further include: when the light-emitting component emits the first light signal, controlling the plurality of self-luminous display units not to emit the second light signal; and when the plurality of self-luminous display units emit the second light signals, controlling the light-emitting assembly not to emit the first light signals.

Optionally, the method further comprises: after the data of the first fingerprint image are collected, the light-emitting assembly is controlled not to emit light, and the self-light-emitting unit is controlled to emit the second light signal.

The specific fingerprint identification method can be referred to the above description, and is not described herein again.

It should be noted that the optical fingerprint sensor in the embodiment of the present application may represent an optical fingerprint sensor chip.

It is to be understood that the structures shown in the drawings of the present application are merely schematic representations, not actual dimensions and proportions, and are not intended to limit 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," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Those of 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 embodiments of the present application.

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 embodiments of the present application may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including 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.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses, devices 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 electronic device, apparatus and method may be implemented in other ways.

For example, the division of units or modules or components in the above-described device embodiments is only a logical division, and other divisions may be realized in practice, for example, multiple units or modules or components may be combined or integrated into another system, or some units or modules or components may be omitted, or not executed.

Also for example, the units/modules/components described above as separate/display components may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the units/modules/components can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

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

Claims

1. A fingerprint identification device is characterized in that the fingerprint identification device is suitable for an electronic device with a display screen, the fingerprint identification device comprises a light path guide structure and a fingerprint sensor, a fingerprint detection area of the fingerprint sensor is arranged in a display area of the display screen,

the light path guiding structure is arranged between the display screen and the fingerprint sensor and is used for guiding a return light signal formed by a finger above the fingerprint detection area to the fingerprint sensor;

the fingerprint sensor is arranged below the display screen and comprises a sensing array with a plurality of optical sensing units, the sensing array is used for receiving the return light signals passing through the light path guide structure and detecting the fingerprint image of the finger according to the return light signals,

wherein the return light signal includes a first return light signal that is a light signal of which a first light signal is transmitted into and out of a finger above the fingerprint detection area and passes through the display screen, and an incident angle at which the first light signal reaches a glass cover at the fingerprint detection area is greater than or equal to a total reflection angle at which the light signal is incident from the glass cover to air.

2. The fingerprint recognition device of claim 1, wherein the incident angle is greater than or equal to 42.6 °.

3. The fingerprint recognition device according to claim 1 or 2, further comprising a light emitting assembly disposed below the non-display area of the display screen for emitting the first light signal to the fingerprint detection area.

4. The fingerprint recognition device of claim 3, wherein the light emitting assembly is disposed in a chin area of the display screen.

5. The fingerprint recognition device of claim 3, wherein the light emitting assembly comprises a vertical cavity surface emitting laser, and wherein an incident angle of the first light signal emitted by the vertical cavity surface emitting laser when reaching the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

6. The fingerprint recognition device of claim 3, wherein the light emitting assembly comprises a light source and a lens, the lens is configured to focus the first light signal emitted by the light source to the fingerprint detection area such that an incident angle of the first light signal upon reaching the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

7. The fingerprint identification device according to claim 3, wherein the light emitting assembly comprises a light source and a shielding member, and the shielding member is used for shielding the light signal emitted by the light source, so that the incident angle of the first light signal emitted by the light source and not shielded by the shielding member when the first light signal reaches the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

8. The fingerprint identification device according to claim 7, wherein the shielding member is ink, the ink is coated on the lower surface of the glass cover plate and is disposed on a side of the light source away from the fingerprint detection area, and the ink is used for shielding the light signal emitted by the light source.

9. The fingerprint recognition device according to claim 3, wherein the light source of the light emitting assembly is disposed obliquely with respect to the display screen, so that the first light signal emitted by the light source can reach the fingerprint detection area at a predetermined angle, and the incident angle of the first light signal is greater than or equal to the total reflection angle when the first light signal reaches the glass cover plate at the fingerprint detection area.

10. The fingerprint recognition device according to claim 3, wherein the light emitting assembly comprises a light source and a light guiding column, the light guiding column is configured to guide the first light signal emitted from the light source to the fingerprint detection area, such that an incident angle of the first light signal passing through the light guiding column when reaching the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

11. The fingerprint identification device according to claim 10, wherein the light guide column comprises a first light guide column and a second light guide column, the first light guide column is connected with the second light guide column, the first light guide column is disposed around the light source, an axial direction of the first light guide column is perpendicular to the display screen, and an axial direction of the second light guide column is inclined with respect to the display screen, so that an incident angle when a light signal passing through the second light guide column reaches the glass cover plate at the fingerprint detection area is greater than or equal to the total reflection angle.

12. The fingerprint recognition device according to claim 3, wherein the light-emitting assembly comprises a light source and a light-reflecting device, the light source emits a light signal toward the light-reflecting device, and the light-reflecting device is configured to reflect the light signal emitted from the light source such that an incident angle of the light signal reflected by the light-reflecting device when the light signal reaches the glass cover of the display screen is greater than or equal to the total reflection angle.

13. The fingerprint recognition device according to claim 12, wherein the light reflecting means is disposed on a side surface of the glass cover plate, and a light reflecting surface of the light reflecting means is perpendicular to a surface of the glass cover plate.

14. The fingerprint recognition device of claim 12, wherein the light reflecting means is a light reflecting coating or a light reflecting film.

15. The fingerprint recognition device according to claim 3, wherein the first light signal light emitted by the light emitting assembly is infrared light or visible light.

16. The fingerprint recognition device of claim 15, wherein the infrared light has a wavelength of 940 nm; alternatively, the visible light has a wavelength of 550 nm.

17. The fingerprint recognition device of claim 3, wherein the light emitting assembly is located at a distance of 15mm to 20mm from the fingerprint sensor along the length of the display.

18. The fingerprint recognition device of claim 3, wherein the light emitting assembly comprises a first light source, the display screen comprises a first position opposite to the position of the first light source, and a second position opposite to the position of the fingerprint sensor, and the first position is located at the center of the second position and extends along the length direction of the display screen.

19. The fingerprint recognition device according to claim 3, wherein the light emitting assembly comprises a first light source, the display screen comprises a first position opposite to the position of the first light source, and a second position opposite to the position of the fingerprint sensor, and the first position is located on one side of a position where a center position of the second position extends along a length direction of the display screen.

20. The fingerprint recognition device according to claim 3, wherein the light emitting assembly includes a second light source and a third light source, the display screen includes a third position opposite to the position of the second light source, a fourth position opposite to the position of the third light source, and a second position opposite to the position of the fingerprint sensor, and the third position and the fourth position are disposed at both sides of a position where a center position of the second position extends in a length direction of the display screen.

21. The fingerprint recognition device according to claim 1 or 2, wherein the display screen includes a plurality of self-light-emitting display units for displaying an image, and the return light signal further includes a second return light signal which is a light signal generated by irradiating the finger with a second light signal at least partially emitted from the self-light-emitting display units and reflecting or scattering the second light signal by the finger.

22. The fingerprint recognition apparatus according to claim 21, wherein said fingerprint sensor is configured to detect a first fingerprint image of said finger from said first return light signal, and is further configured to detect a second fingerprint image of said finger from said second return light signal.

23. The fingerprint recognition device of claim 22, wherein the second optical signal has a wavelength of 550 nm.

24. The fingerprint recognition device of claim 21, further comprising a processor configured to:

acquiring a first fingerprint image, the first fingerprint image being generated from the first return light signal;

when the first fingerprint image is matched with a first preset fingerprint image, determining that the fingerprint identification is successful; or,

and when the first fingerprint image is not matched with the first preset fingerprint image, determining that the fingerprint identification fails.

25. The fingerprint recognition device of claim 21, further comprising a processor configured to:

acquiring a second fingerprint image, the second fingerprint image being generated from the second return light signal;

when the first fingerprint image is successfully matched with the first preset fingerprint image and/or when the second fingerprint image is successfully matched with the second preset fingerprint image, determining that the fingerprint identification is successful; or

And when the first fingerprint image is not matched with the first preset fingerprint image and the second fingerprint image is not matched with the second preset fingerprint image, determining that the fingerprint identification fails.

26. The fingerprint recognition device of claim 21, further comprising a control unit and a light emitting assembly, wherein the control unit is configured to control the at least partially self-emitting display unit to not emit the second light signal when the light emitting assembly emits the first light signal, and to control the light emitting assembly to not emit the first light signal when the at least partially self-emitting display unit emits the second light signal.

27. The fingerprint recognition device of claim 21, further comprising a control unit and a light emitting assembly, wherein the control unit is configured to control the light emitting assembly not to emit light and the at least partially self-light emitting unit to emit the second light signal after the fingerprint sensor has acquired data of the first fingerprint image.

28. The fingerprint recognition device of claim 21, wherein the optical path directing structure comprises an optical lens disposed above the fingerprint sensor for focusing the return optical signals passing through the display screen onto the sensing array of the fingerprint sensor.

29. The fingerprint recognition device of claim 28, wherein the first return light signal is infrared light, the second return light signal is visible light,

the optical lens can image infrared light and can image visible light without image chromatic aberration.

30. The fingerprint recognition device of claim 21, further comprising a filter above the fingerprint sensor, the filter being configured to filter out light signals other than the first return light signal and the second return light signal.

31. The fingerprint recognition device of claim 30, wherein the first return light signal is infrared light having a wavelength of 940nm, the second return light signal is visible light having a wavelength of 550nm,

the optical filter is at least used for filtering out light with the wavelength not equal to 940nm and 550 nm.

32. The fingerprint recognition device according to claim 1 or 2, wherein the optical path guiding structure comprises an optical collimator having a plurality of collimating units or micro-hole arrays, the optical collimator being configured to transmit the return optical signals passing through the display screen to corresponding optical sensing units in the sensing array of the fingerprint sensor through the plurality of collimating units or micro-hole arrays, respectively; or,

the light path guiding structure comprises a micro lens array with a plurality of micro lenses and a light blocking layer with a plurality of micropores, wherein the micro lens array is used for focusing return light signals passing through the display screen to the micropores corresponding to the light blocking layer respectively and transmitting the return light signals to corresponding optical sensing units in the sensing array of the fingerprint sensor through the micropores.

33. An electronic device, comprising: the fingerprint recognition device according to any one of claims 1 to 32.

34. A fingerprint recognition method applied to the fingerprint recognition device according to any one of claims 1 to 32, the method comprising:

acquiring a first fingerprint image generated from a first return light signal, the first return light signal being a light signal of a first light signal transmitted into and out of a finger above the fingerprint detection area and passing through the display screen, an incident angle at which the first light signal reaches a glass cover at the fingerprint detection area being greater than or equal to a total reflection angle at which the light signal is incident from the glass cover to air;

and performing fingerprint identification according to the first fingerprint image.

35. The method of claim 34, wherein the performing fingerprint recognition based on the first fingerprint image comprises:

and when the first fingerprint image is not matched with the first preset fingerprint image, determining that fingerprint identification fails.

36. The method of claim 35, wherein the display screen comprises a plurality of self-emissive units, the method further comprising:

acquiring a second fingerprint image generated from second return light which is an optical signal reflected after a second optical signal is irradiated to the finger, the second optical signal being an optical signal emitted from at least a part of the light emitting unit;

the fingerprint identification according to the first fingerprint image comprises:

and when the first fingerprint image is matched with a first preset fingerprint image and/or the second fingerprint image is matched with a second preset fingerprint image, determining that the fingerprint identification is successful.

37. The method of claim 36, wherein the performing fingerprint recognition based on the first fingerprint image comprises:

and when the first fingerprint image is not matched with the first preset fingerprint image or the second fingerprint image is not matched with the second preset fingerprint image, determining that fingerprint identification fails.

38. The method of claim 36 or 37, wherein the first light signal is a light signal emitted by a light emitting assembly, the method further comprising:

when the light-emitting component emits the first light signal, controlling the plurality of self-luminous display units not to emit the second light signal;

when the plurality of self-luminous display units emit the second optical signals, the light-emitting components are controlled not to emit the first optical signals.

39. The method of claim 36 or 37, wherein the first light signal is a light signal emitted by a light emitting assembly, the method further comprising:

after the data of the first fingerprint image are collected, the light-emitting assembly is controlled not to emit light, and the self-light-emitting unit is controlled to emit the second light signal.