CN111626214B

CN111626214B - Under-screen fingerprint identification device and system, fingerprint identification method and electronic device

Info

Publication number: CN111626214B
Application number: CN202010463855.3A
Authority: CN
Inventors: 青小刚; 李顺展
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2023-09-05
Anticipated expiration: 2040-05-27
Also published as: CN111626214A

Abstract

The application provides an under-screen fingerprint identification device and system, a fingerprint identification method and an electronic device. The under-screen fingerprint identification device is suitable for an electronic device with a self-luminous display screen, and a fingerprint detection area of the under-screen fingerprint identification device is at least partially positioned in a display area of the self-luminous display screen; the under-screen fingerprint identification device comprises a fingerprint identification module and a detection light source, wherein the fingerprint identification module is arranged below the self-luminous display screen, the detection light source is used for providing invisible detection light, and at least one of the detection light and the visible light emitted by the self-luminous display screen irradiates a finger above a fingerprint detection area so as to form fingerprint detection light carrying fingerprint information; the fingerprint identification module is used for receiving fingerprint detection light to collect fingerprint images. The under-screen fingerprint identification device can solve the problem that the eye comfort degree is affected due to the dazzling light spots of the self-luminous display screen during fingerprint identification, and improves the user experience effect.

Description

Under-screen fingerprint identification device and system, fingerprint identification method and electronic device

Technical Field

The present application relates to the field of fingerprint identification technologies, and in particular, to an on-screen fingerprint identification device and system, a fingerprint identification method, and an electronic device.

Background

Fingerprint identification has become a function equipped for most mobile terminals such as mobile phones and tablet computers. As smart phones enter the full screen era, the screen occupation ratio of the smart phones is larger and larger, and the under-screen fingerprint identification technology is a trend.

Currently, an under-screen optical fingerprint recognition technology applied to an Organic Light-Emitting Diode (OLED) screen has entered the commercial era. The mobile terminal adopting the OLED screen uses the self-luminous display unit as a light source to perform screen lighting, the OLED screen irradiates light spots formed by light rays emitted by the self-luminous display unit in the fingerprint detection area onto fingers above the screen to form fingerprint detection light, and the fingerprint detection light returns to and penetrates through the OLED screen and is received by an optical fingerprint sensor below the OLED screen, so that fingerprint image acquisition is realized through the optical fingerprint sensor, and fingerprint identification is further realized. In order to improve fingerprint recognition efficiency and reduce exposure time, the self-luminous display unit for forming the above-mentioned light spot in the OLED screen is usually operated in a high-brightness mode (HBM) in a screen lighting state, and at this time, the light spot brightness of the OLED screen may be as high as 1000nit or more.

However, due to the adoption of a screen lighting mode, the formed light spots have high brightness, and in dark environments such as night, if an OLED screen is in a black screen, the light spots are very glaring, so that the comfort level of eyes is affected.

Disclosure of Invention

The application provides an under-screen fingerprint identification device and system, a fingerprint identification method and an electronic device, which can solve the problem that the comfort level of eyes is affected due to the dazzling of light spots of a self-luminous display screen during fingerprint identification, and improve the user experience effect.

In a first aspect, the present application provides an under-screen fingerprint recognition device, adapted for an electronic device having a self-luminous display screen, wherein a fingerprint detection area of the under-screen fingerprint recognition device is at least partially located within a display area of the self-luminous display screen;

the under-screen fingerprint identification device comprises a fingerprint identification module and a detection light source, wherein the fingerprint identification module is arranged below the self-luminous display screen, the detection light source is used for providing invisible detection light, and at least one of the detection light and visible light emitted by partial self-luminous display pixels of the self-luminous display screen can be used as excitation light for fingerprint identification according to the environmental information of the current self-luminous display screen and irradiates a finger above a fingerprint detection area so as to form fingerprint detection light carrying fingerprint information on the finger; the fingerprint identification module is used for receiving fingerprint detection light carrying fingerprint information so as to collect fingerprint images of the finger.

In one embodiment of the present application, the environment information of the self-luminous display screen includes an illumination environment in which the self-luminous display screen is currently located and a light emission state of the self-luminous display screen.

In one embodiment of the present application, the self-luminous display screen and the detection light source are configured to be controlled to time-divisionally shine a finger above the self-luminous display screen under different environmental conditions, wherein the environmental conditions are related to environmental information of the self-luminous display screen.

In one embodiment of the present application, when the environmental information of the current self-luminous display screen satisfies the first preset condition, the detection light source is configured to provide invisible detection light as excitation light for fingerprint recognition and irradiates a finger above the self-luminous display screen to generate fingerprint detection light.

In one embodiment of the present application, the first preset condition is that the current self-luminous display screen is in a dark light environment and the current self-luminous display screen is in a black screen state.

In one embodiment of the present application, when the environmental information of the current self-luminous display screen satisfies the second preset condition, the self-luminous display pixels of the self-luminous display screen located in the fingerprint detection area are driven to highlight the light spots for use as excitation light for fingerprint recognition and are irradiated to the finger above the self-luminous display screen to generate fingerprint detection light.

In one embodiment of the present application, the second preset condition is that the current self-luminous display screen is in a bright light environment or that the current self-luminous display screen is in a bright screen state.

In one embodiment of the present application, the self-luminous display screen is an OLED screen, and the self-luminous pixel unit is an OLED pixel unit of the OLED screen located in the fingerprint detection area.

In one specific embodiment of the application, the detection light source is an infrared light source, the detection light emitted by the detection light source is infrared light, and the wavelength range of the infrared light is 850nm-940nm.

In one embodiment of the present application, an OLED screen includes a display module and a protective cover plate covering the display module.

In one embodiment of the present application, the detection light source and the fingerprint recognition module are disposed below the display module.

In one embodiment of the present application, the detection light source is integrated inside the fingerprint recognition module.

In one specific embodiment of the application, the detection light source is arranged at the periphery of the fingerprint identification module, and the distance between the detection light source and the fingerprint identification module is 2mm-10mm.

In one embodiment of the application, the detection light source is arranged at the side of the display module and is arranged below the protective cover plate side by side with the display module, wherein the detection light source is positioned below the edge area of the protective cover plate and is used for emitting detection light to fingers above the OLED screen through the protective cover plate.

In a specific embodiment of the application, a distance between the fingerprint identification module and one side edge of the protective cover plate corresponding to the detection light source is less than or equal to 15mm.

In a specific embodiment of the application, a light-transmitting film layer is arranged on the back surface of the protective cover plate corresponding to the edge area of the detection light source, and the light-transmitting film layer is used for transmitting the detection light.

In a specific embodiment of the application, the fingerprint identification module comprises a fingerprint sensor and a filter, wherein the fingerprint sensor is used for receiving fingerprint detection light to acquire fingerprint information of a finger, the filter is arranged on the light inlet side of the fingerprint sensor, the filter is a double-pass filter with a first transmission wave band and a second transmission wave band, the first transmission wave band corresponds to a visible light wave band emitted by self-luminous display pixels of the self-luminous display screen, the second transmission wave band corresponds to a detection light wave band emitted by the detection light source, and the filter is used for filtering out detection light and interference light except the visible light.

In a specific embodiment of the present application, the fingerprint recognition module further includes an optical element, and the optical element is disposed on an incident side of the fingerprint sensor, and is configured to guide or collect fingerprint detection light transmitted through the self-luminous display screen to the fingerprint sensor.

In a second aspect, the present application provides an off-screen fingerprint recognition system comprising a self-luminous display screen and an off-screen fingerprint recognition device as described above for setting under the self-luminous display screen to enable off-screen optical fingerprint detection.

In a third aspect, the present application provides a fingerprint identification method, suitable for an under-screen fingerprint identification device, the under-screen fingerprint identification device being disposed below a self-luminous display screen, the fingerprint identification method comprising:

acquiring environment information of the self-luminous display screen, wherein the environment information comprises the current illumination environment and the luminous state of the self-luminous display screen;

selecting at least one of visible light emitted by self-luminous display pixels of the self-luminous display screen positioned in a fingerprint detection area and invisible detection light emitted by a detection light source as excitation light for fingerprint identification according to environmental information of the self-luminous display screen, and irradiating a finger above the fingerprint detection area with the excitation light;

and receiving fingerprint detection light carrying fingerprint information of the finger, which is formed by irradiating the finger with excitation light, and collecting a fingerprint image of the finger based on the fingerprint detection light.

In one embodiment of the present application, selecting at least one of visible light emitted from self-luminous display pixels of a self-luminous display screen located in a fingerprint detection area and non-visible probe light emitted from a detection light source as excitation light for fingerprint recognition according to environmental information of the self-luminous display screen, comprises:

judging whether the environment information of the current self-luminous display screen meets a first preset condition or not, wherein the first preset condition is that the current self-luminous display screen is in a dark light environment and the current self-luminous display screen is in a black screen state;

when the first preset condition is met, the detection light source is controlled to emit invisible detection light to serve as excitation light for fingerprint identification, and the excitation light is irradiated to the finger above the self-luminous display screen to generate fingerprint detection light.

In one embodiment of the present application, at least one of visible light emitted from self-luminous display pixels of the self-luminous display screen located in the fingerprint detection area and non-visible probe light emitted from the detection light source is selected as excitation light for fingerprint recognition according to environmental information of the self-luminous display screen, further comprising:

Judging whether the environment information of the current self-luminous display screen meets a second preset condition, wherein the second preset condition is that the current self-luminous display screen is in a bright environment or the current self-luminous display screen is in a bright screen state;

when the second preset condition is met, controlling the self-luminous display pixels of the self-luminous display screen, which are positioned in the fingerprint detection area, to emit light so as to display a highlight light spot;

the visible light emitted by the highlight speckles is used as the excitation light for fingerprint identification and irradiates the finger above the self-luminous display screen to generate fingerprint detection light.

In one embodiment of the present application, determining whether the environmental information of the current self-luminous display screen satisfies a first preset condition includes:

judging whether the system time of the electronic device where the self-luminous display screen is positioned is at night or not;

if yes, directly determining that the current self-luminous display screen is in a dark light environment;

otherwise, detecting the current ambient light intensity of the self-luminous display screen, and judging whether the current self-luminous display screen is in a dark light environment according to the ambient light intensity.

In a fourth aspect, the present application provides an electronic device comprising an off-screen fingerprint identification system as described above.

According to the under-screen fingerprint identification device and system, the fingerprint identification method and the electronic device, the detection light source is arranged below the self-luminous display screen, the detection light provided by the detection light source is non-visible light, and at least one of the detection light and the visible light emitted by part of self-luminous display pixels of the self-luminous display screen is selected as excitation light for fingerprint identification according to the environmental information of the self-luminous display screen; when the self-luminous display screen is in a dark light environment and is in a black screen state, the invisible detection light emitted by the detection light source can irradiate the finger above the fingerprint detection area of the self-luminous display screen, so that the brightness of light spots formed in the fingerprint detection area can be reduced, no dazzling light spots can be formed, discomfort to eyes can be avoided in the dark environment, and the user experience effect can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application. Other figures may be derived from these figures without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic front view of an OLED screen to which an under-screen fingerprint recognition device according to a first embodiment of the present application is applicable;

fig. 2 is an installation schematic diagram of an on-screen fingerprint recognition device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an on-screen fingerprint recognition device according to a third embodiment of the present application;

FIG. 4 is a schematic diagram illustrating the arrangement of the detection light source corresponding to FIG. 3;

fig. 5 is a schematic structural diagram of another device for identifying fingerprints under a screen according to a fourth embodiment of the present application;

FIG. 6 is a schematic diagram illustrating the arrangement of the detection light source corresponding to FIG. 5;

fig. 7 is a flowchart of a step of a light supplementing method for fingerprint identification according to a fifth embodiment of the present application;

fig. 8 is a control flow chart of a fingerprint identification method according to a fifth embodiment of the present application;

fig. 9 is a schematic front view of an electronic device to which the on-screen fingerprint recognition device according to the embodiment of the present application may be applied;

fig. 10 is a schematic cross-sectional view of the electronic device shown in fig. 9.

Reference numerals illustrate:

1. 130-a fingerprint identification module; 11-a fingerprint sensor; 111a, 103-fingerprint detection area; 12-a filter; 13-an optical element; 2-detecting a light source; a 3-OLED screen; 31-a display module; 32-protecting cover plate; 33-a support plate; 331-a through hole; 34-a flexible circuit board; 35-a light-transmitting film layer; 4. 140-finger;

10-an electronic device; 111-excitation light; 120-display screen; 131-an optical sensing unit; 132-an optical component; 133-an optical sensing array; 134-an optical fingerprint sensor; 141-ridges; 142-valley; 151-fingerprint detection light from a fingerprint ridge; 152-fingerprint detection light from fingerprint valleys.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The technical scheme of the application is described in detail below by specific examples. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

Currently, OLED screens and liquid crystal display (Liquid Crystal Display, LCD) screens are widely used as self-luminous display screens and non-self-luminous display screens in electronic devices such as smart mobile terminals, respectively. Among them, the OLED screen belongs to a current type organic light emitting device, which can control each display unit (also called as display pixel) to emit light independently through a display driving module. An electronic device employing an OLED screen may enable off-screen optical fingerprint detection such that the fingerprint detection area is located within the display area of the OLED screen.

In some embodiments, an optical fingerprint sensor may be disposed below the OLED screen, and the self-luminous display pixels of the OLED screen may be driven to emit light as a fingerprint excitation light source for screen lighting, in particular, the self-luminous display pixels located in the fingerprint detection area in the OLED screen are driven to emit light so as to display a spot in the fingerprint detection area, and the emitted light is irradiated onto a finger above the OLED screen as excitation light for fingerprint recognition, and after being scattered, reflected or transmitted by the finger, fingerprint detection light carrying fingerprint information is formed, and the fingerprint detection light returns to the OLED screen and is transmitted to the optical fingerprint sensor below through the OLED screen, and the optical fingerprint sensor may receive the fingerprint detection light and convert the fingerprint detection light into a corresponding electrical signal, thereby implementing fingerprint image acquisition.

In general, in order to improve fingerprint recognition efficiency and reduce exposure time, the above-mentioned screen lighting method is used for performing the optical fingerprint detection under the screen, and generally the self-luminous display pixels in the fingerprint detection area need to operate in a High Brightness Mode (HBM), for example, the highest brightness of the light spot displayed by the self-luminous display pixels may reach more than 1000 nit.

In the environment with good light in daytime, the light spot brightness formed by the screen lighting mode is not greatly different from the light brightness of the environment, so that the light spot cannot cause discomfort to human eyes; however, in a dark night or in a room with darker light, if the OLED screen performs fingerprint unlocking in a black screen state, the light spots displayed by the OLED screen are very glaring, which can cause discomfort to eyes and affect the user experience effect.

In view of the above, the embodiments of the present application provide an on-screen fingerprint identification device, an on-screen fingerprint identification system, a fingerprint identification method, and an electronic device, so as to reduce the light spot brightness generated during fingerprint identification and improve the user experience effect.

The technical scheme of the application will be described below with reference to the accompanying drawings.

The device, system and method for fingerprint identification under screen of the embodiment of the application can be applied to various electronic devices, such as smart phones, notebook computers, tablet computers, game devices and other portable or mobile computing devices, and the embodiment of the application is not limited to this.

Fig. 9 and 10 are schematic diagrams of electronic devices to which embodiments of the present application may be applied. Fig. 9 is a schematic front view of the electronic device 10, and fig. 10 is a schematic cross-sectional view of the electronic device 10 shown in fig. 9. Referring to fig. 9 and 10, the electronic device 10 may include a display 120 and a fingerprint recognition module 130.

The display screen 120 may be a self-luminous display screen, which has self-luminous display units as display pixels, for example, an Organic Light-emitting diode (Organic Light-EmittingDiode, OLED) screen or a Micro-Light-emitting diode (Micro-LED) display screen, and the two display pixels respectively use an OLED display pixel or a Micro-LED display pixel capable of controlling Light emission independently to display a picture. Further, the display screen 120 may be specifically a touch display screen, which not only can perform screen display, but also can detect touch or press operation of a user, so as to provide a personal computer interaction interface for the user. For example, in one embodiment, the electronic device 10 may include a Touch sensor, which may be specifically a Touch Panel (TP), which may be disposed on the surface of the display screen 120, or may be partially integrated or integrally integrated into the display screen 120, so as to form the Touch display screen.

The fingerprint recognition module 130 includes an optical fingerprint sensor including an optical sensing array 133 (also referred to as a sensing pixel array or pixel cell array) having a plurality of optical sensing units 131 (also referred to as optical sensing pixels, sensing pixels or pixel cells, etc.). The photosensitive area (also referred to as the sensing area) of the optical sensing array 133 corresponds to the fingerprint detection area 103 (also referred to as the fingerprint acquisition area, the fingerprint identification area, etc.) of the fingerprint identification module 130. The optical sensing unit 131 may comprise a Photo detector (Photo detector), i.e. the optical sensing array 133 may in particular comprise a Photo detector array comprising a plurality of Photo detectors distributed in an array.

The fingerprint recognition module 130 is disposed in a partial area under the display screen 120, and the fingerprint detection area 103 of the fingerprint recognition module 130 may be located in at least a portion of the display area of the display screen 120. When a user desires to unlock or otherwise verify the electronic device 10, the user simply presses his finger against the fingerprint detection area 103 on the display 120 to effect fingerprint input.

More specifically, referring to fig. 10, the fingerprint module 130 may include an optical fingerprint sensor 134 and an optical component 132. The optical fingerprint sensor 134 includes the optical sensing array 133, and a reading circuit and other functional circuits electrically connected to the optical sensing array 133, and the optical sensing array 133 and the circuits may be fabricated on one chip (Die) by a semiconductor process to form the optical fingerprint sensor 134. The optical component 132 may be disposed above the optical sensing array 133 of the light detecting portion 134, and may specifically include a Filter layer (Filter), a light guiding layer or an optical path guiding structure, where the Filter layer may be used to Filter out ambient light or other interference light penetrating through a finger, and the light guiding layer or the optical path guiding structure is mainly used to guide fingerprint detection light formed by a finger above the display screen 120 and returned through the display screen 120 to the optical sensing array 133 for optical detection so as to implement fingerprint image acquisition, where the fingerprint detection light may be an optical signal formed by reflecting, scattering or transmitting excitation light emitted by a fingerprint excitation light source to a finger above the display screen 120 and carrying fingerprint information of the finger.

In some embodiments of the present application, the optical component 132 may be fabricated on the same optical fingerprint part as the light detecting portion 134, and the optical path guiding structure and the filter layer of the optical component 132 may be fabricated on the surface of the optical fingerprint sensor 134; the optical assembly 132 may also be disposed as a discrete component over the optical fingerprint sensor 134. In other alternative embodiments, some of the components of the optical assembly 132 are integrated into the chip described above.

As shown in fig. 10, in an embodiment, the display screen 120 is a self-luminous display screen with self-luminous display pixels, for example, an OLED screen, and the fingerprint recognition module 130 may use a self-luminous display unit (i.e., an OLED display pixel) of the OLED screen located in the fingerprint detection area 103 as a fingerprint excitation light source. When a finger 140 is pressed against the fingerprint detection area 103, the OLED display pixels located in the fingerprint detection area 103 are driven to operate in a highlight mode, so that a spot with enough brightness is displayed in the fingerprint detection area 103, and excitation light 111 is emitted to the finger 140 above the OLED screen through the spot, and the excitation light 111 irradiates the finger 140 and is reflected, scattered or transmitted at the finger 140 to form corresponding reflected light, scattered light or transmitted light; the reflected light, scattered light, or transmitted light carries the fingerprint information of the finger 140, and thus, in the related patent application, the reflected light, scattered light, or transmitted light is collectively referred to as fingerprint detection light. Since ridges (ribs) 141 and valleys (valey) 142 of the fingerprint have different reflective, scattering or transmissive capacities for light, fingerprint detection light 151 from the fingerprint ridges and fingerprint detection light 152 from the fingerprint valleys have different light intensities. The fingerprint detection light is guided through the optical path of the optical component 132 and is transmitted to the optical sensing array 133 of the optical fingerprint sensor 134 for optical fingerprint imaging after necessary optical processing, and is converted into a corresponding electrical signal, i.e., a fingerprint image signal. The fingerprint image signal may be used to obtain fingerprint image data of the finger 140 and may be further subjected to fingerprint matching verification, thereby implementing an optical fingerprint recognition function in the electronic device 10.

In the embodiment provided by the application, the device and the system for fingerprint recognition under the screen can further comprise an additional detection light source, wherein the detection light source is a light supplementing light source independent of the OLED screen, such as an infrared light source or other invisible light sources, and can be controlled to emit invisible detection light to the finger 140 above the OLED screen under preset conditions as excitation light for fingerprint recognition. Specifically, the detection light source and the self-luminous display pixels of the OLED screen may be controlled to perform time-sharing lighting on a finger under different environmental conditions, for example, when a first preset condition is satisfied, the detection light source is used to perform external lighting on the finger above the OLED screen, and when a second preset condition is satisfied, the self-luminous display pixels of the OLED screen are used to display light spots to perform screen lighting on the finger. Wherein the first preset condition and the second preset condition may be related to environmental information of the OLED screen, and the environmental information of the OLED screen may include an illumination environment and a screen lighting state; for example, the first preset condition may be that the OLED screen is currently in a dark light environment and the OLED screen is in a black screen state, and the second preset condition may be that the OLED screen is currently in a bright light environment or the OLED screen is in a bright screen state.

When the first preset condition is met, the detection light emitted by the detection light source can irradiate the finger 140 above the detection light source through the OLED screen 120, similar to the self-luminous display pixel of the OLED screen being used as an excitation light source, the fingerprint detection light corresponding to the detection light can be formed after the detection light emitted by the detection light source irradiates the finger 140, and the fingerprint detection light further passes through the OLED screen and is transmitted to the fingerprint identification module 130 below the fingerprint detection light to perform optical fingerprint imaging.

Example 1

Fig. 1 is a schematic front view of an OLED screen to which an under-screen fingerprint recognition device according to a first embodiment of the present application is applicable; fig. 2 is an installation schematic diagram of an on-screen fingerprint recognition device according to an embodiment of the application.

As shown in fig. 1 and 2, the present embodiment provides an off-screen fingerprint recognition device applied to an electronic device having an OLED screen 3. The under-screen fingerprint recognition device is an optical fingerprint recognition device, and can be applied to electronic devices such as smart phones, tablet computers and other mobile terminals adopting the OLED screen 3.

As shown in fig. 1, the OLED screen 3 has a fingerprint detection area 111, and it is understood that, since the off-screen fingerprint recognition device of the present embodiment is an optical fingerprint recognition device, at least a part of the detection area of the fingerprint detection area 111 should be located within the display area of the OLED screen 3.

When the finger 4 is located on the fingerprint detection area 111 within the display area of the OLED screen 3, excitation light for fingerprint recognition may be irradiated to the finger 4 above the fingerprint detection area 111, such that the illuminated portion of the finger 4 forms fingerprint detection light, which is received and recognized by the off-screen fingerprint recognition device through the OLED screen 3.

In some embodiments, the fingerprint detection area 111 may be located entirely within the display area of the OLED screen 3, such that the excitation light for fingerprint recognition may illuminate the entire fingerprint detection area 111, the fingerprint portion of the finger 4 within the entire fingerprint detection area 111 may be illuminated, and the fingerprint detection light formed by the finger 4 within the entire fingerprint detection area 111 may be received by the off-screen fingerprint recognition device through the OLED screen 3, such that the off-screen fingerprint recognition device may collect a more complete fingerprint image, and may improve the recognition efficiency and recognition accuracy of the off-screen fingerprint recognition device.

Thus, the display area of the OLED screen 3 can be extended to cover the front of the entire electronic device to meet the overall screen demand of high screen ratio. The fingerprint detection area 111 may be disposed at any position in the display area of the OLED screen 3, and the position of the fingerprint detection area 111 may be set according to actual requirements.

Correspondingly, the fingerprint recognition module 1 can be set according to the position of the fingerprint detection area 111, so that the sensing area of the fingerprint recognition module 1 covers the fingerprint detection area 111, and therefore, the fingerprint recognition module 1 can collect the fingerprint image of the part pressed by the finger on the fingerprint detection area 111.

Specifically, as shown in fig. 2, the under-screen fingerprint recognition device includes a fingerprint recognition module 1, where the fingerprint recognition module 1 may be disposed below the OLED screen 3, and the excitation light for fingerprint recognition irradiates the finger 4 above the fingerprint detection area 111 of the OLED screen 3 and forms fingerprint detection light on the finger 4, where the fingerprint detection light carries fingerprint information. The fingerprint detection light is transmitted to the fingerprint identification module 1 below the OLED screen 3 through the OLED screen 3, and the fingerprint identification module 1 receives the fingerprint detection light to collect fingerprint images of the finger 4, and the fingerprint images can be further used for identification so as to carry out identity authentication on a user.

In a specific embodiment, the visible light emitted from the self-luminous pixel unit (i.e., OLED pixel unit) of the OLED screen 3 may be utilized as the excitation light for fingerprint recognition. The OLED screen 3 can be driven to emit visible light to display a picture, when a finger 4 of a user is placed above a fingerprint detection area 111 of the OLED screen 3 during fingerprint identification, an OLED pixel unit of the OLED screen 3 located in the fingerprint detection area 111 can be controlled to emit light in a highlighting mode to display a light spot, the visible light emitted by the light spot irradiates the finger 4 on the fingerprint detection area 111, the finger 4 reflects or scatters the visible light of the OLED screen 3 to form fingerprint detection light carrying fingerprint information of the finger 4, the fingerprint detection light is transmitted to the fingerprint identification module 1 through the OLED screen 3, the fingerprint identification module 1 receives the fingerprint detection light to acquire a fingerprint image of the finger 4, and the fingerprint image can be further used for identification to authenticate the user.

In this way, the visible light emitted by the OLED screen 3 is used as the excitation light for fingerprint identification, and fingerprint collection can be achieved by illuminating the finger 4 above the fingerprint detection area 111 through the OLED screen 3 without additionally providing a light supplementing source for fingerprint identification.

However, when the visible light emitted by the OLED pixel unit of the OLED screen 3 is used as the excitation light for fingerprint recognition, in order to improve the fingerprint recognition efficiency and reduce the exposure time, the OLED pixel unit in the fingerprint detection area 111 is often required to operate in a highlight mode to form a highlight spot. For fingerprint identification in a bright light environment such as the daytime, the brightness of the light spots is not greatly different from the brightness of the environment light; however, in dark light environments such as the night, if the electronic device in the black screen state is fingerprint unlocked, the highlight speckles are very dazzling due to high brightness, and discomfort is caused to eyes of people.

In order to avoid discomfort to human eyes caused by dazzling light spots formed in the fingerprint detection area 111 when the electronic device with the black screen is unlocked in a dark light environment, in a specific embodiment of the application, the under-screen fingerprint recognition device further comprises a detection light source 2, the detection light source 2 can emit detection light with unobvious human eye perception, the detection light is used as excitation light for fingerprint recognition, the detection light can irradiate a finger 4 above the fingerprint detection area 111 through the OLED screen 3, fingerprint detection light carrying fingerprint information is formed by reflection, scattering or transmission of the finger 4, the fingerprint detection light is transmitted to the fingerprint recognition module 1 through the OLED screen 3, and the fingerprint recognition module 1 receives the fingerprint detection light to collect fingerprint images of the finger 4.

In a specific embodiment, the detection light emitted by the detection light source 2 is invisible light. When the electronic device with the black screen is unlocked in a dark light environment such as at night, the invisible light irradiates the fingerprint detection area 111, highlight light spots cannot be formed in the fingerprint detection area 111, and dazzling light spots cannot be generated in the fingerprint unlocking process, so that discomfort is not caused to eyes of a person, and the user experience effect can be improved.

In a specific application, in a dark light environment such as at night and when the OLED screen 3 is in a black screen state, only the invisible probe light emitted from the detection light source 2 may be used as excitation light for fingerprint identification and irradiated to the finger 4 above the fingerprint detection area 111, thereby forming fingerprint detection light corresponding to the invisible light, which may be referred to as first fingerprint detection light in this embodiment.

In a condition that the ambient light brightness is good during the daytime or the fingerprint recognition operation is performed when the OLED screen 3 is in the bright screen state, only the visible light emitted from the OLED pixel unit of the OLED screen 3 in the fingerprint detection area 111 may be used as the excitation light for fingerprint recognition to form a highlight light spot and irradiated to the finger 4 above the fingerprint detection area 111, so that fingerprint detection light corresponding to the above visible light is formed at the finger 4, which may be referred to as second fingerprint detection light in this embodiment.

However, it should be noted that, although the above embodiment uses the environmental information (including the current illumination environment and the light emitting state of the OLED screen) of the OLED screen 3 as the condition for selecting the excitation light or the detection light for fingerprint recognition, that is, under the first preset condition that the OLED screen 3 is in the dark environment currently, the invisible detection light emitted by the detection light source 2 is used as the excitation light for fingerprint recognition, and under the second preset condition that the OLED screen 3 is in the bright environment currently, the visible light emitted by the OLED screen 3 is used as the excitation light for fingerprint recognition, in other embodiments, the selection condition of the excitation light or the detection light may be determined according to the specific application scenario, and the present application is not particularly limited.

For example, in some other embodiments, when the ambient light brightness is good during the daytime or when the OLED screen 3 is in the bright screen state, the visible light emitted by the OLED screen 3 and the non-visible light emitted by the detection light source 2 are irradiated to the finger 4 above the fingerprint detection area 111, and the visible light emitted by the OLED screen 3 and the non-visible light emitted by the detection light source 2 are irradiated to the finger 4 together to form fingerprint detection light, that is, the fingerprint detection light includes the first fingerprint detection light corresponding to the above non-visible light and the second fingerprint detection light corresponding to the above visible light. At this time, due to the existence of the first fingerprint detection light, the power of the visible light emitted by the OLED pixel unit of the OLED screen 3 may be lower, so that the light spot brightness formed in the fingerprint detection area 111 is lower, which is beneficial to protecting the OLED pixel unit of the fingerprint detection area 111 from being damaged permanently, such as burning out, when the OLED pixel unit is operated in a high-brightness state for a long time.

Alternatively, when the ambient light level is good or the OLED screen 3 is in a bright screen state, only the invisible probe light emitted from the probe light source 2 is used to irradiate the finger 4 above the fingerprint detection area 111 to form fingerprint detection light.

Similarly, in a dark light environment such as the night and in a black screen state of the OLED screen 3, the visible light emitted from the OLED screen 3 and the invisible light emitted from the detection light source 2 may be used together as excitation light for fingerprint recognition and irradiated to the finger 4 above the OLED screen 3 to form fingerprint detection light, and in this case, the fingerprint detection light also includes first fingerprint detection light corresponding to the invisible light and second fingerprint detection light corresponding to the visible light. At this time, the light emitting power of the OLED pixel unit of the OLED screen 3 in the fingerprint detection area 111 may be reduced to weaken the light spot brightness formed in the fingerprint detection area 111, so that the user may not feel uncomfortable.

In a specific embodiment, the invisible probe light emitted by the detection light source 2 may be infrared light.

For the case where the detection light source 2 emits infrared light, the detection light source 2 is an infrared light source, and the detection light source 2 may be an infrared LED light source, an infrared vertical cavity surface emitting Laser (Vertical CavitySurface Emitting Laser, abbreviated as "VCSEL"), or an infrared Laser Diode (Laser Diode), for example.

In some embodiments, the wavelength range of the infrared light emitted by the detection light source 2 may be 850nm-940nm, that is, the wavelength of the infrared light emitted by the detection light source 2 is between 850nm and 940nm, and exemplary, the wavelength of the infrared light emitted by the detection light source 2 may be 850nm, 870nm, 910nm, 930nm, 940nm, or the like.

In one embodiment, the wavelength of the infrared light emitted by the detection light source 2 may be defined as 940nm, so that when the infrared light emitted by the detection light source 2 irradiates the fingerprint detection area 111 through the OLED screen 3 when the OLED screen 3 is in a dark light environment, no visible light spot is generated, and a better effect is achieved.

As shown in fig. 2, in this embodiment, the OLED screen 3 specifically includes a display module 31 and a protective cover plate 32, where the display module 31 may include an OLED panel including an OLED pixel array, and OLED pixel units of the OLED pixel array may perform self-luminescence under the driving of a display driving unit to display an image. For example, the OLED panel of the display module 31 may include an anode layer, an organic light emitting layer, and a cathode layer, which are stacked, with the organic light emitting layer interposed therebetween. The fingerprint detection area 111 may be disposed in a display area of the display module 31.

The protection cover plate 32 covers the display module 31, i.e. the protection cover plate 32 is located at the outermost side of the front surface of the electronic device, and the protection cover plate 32 is used for protecting the display module 31 to prevent the display module 31 from being damaged. The protective cover 32 may be a transparent cover, such as a glass cover or a sapphire cover. In addition, the outer surface of the protective cover plate 32 may be further provided with a protective layer.

Since the display module 31 is further provided with the protective cover 32, in this embodiment, the finger 4 presses the fingerprint detection area 111 of the display module 31, which may actually be the protective cover 32 pressed by the finger 4 over the display module 31 or the protective layer surface covering the protective cover 32.

In one possible embodiment, the display module 31 may be formed with a light-transmitting area for transmitting the fingerprint detection light, and the light-transmitting area may refer to an area where the relevant optical film of the display module 31 forms a light-transmitting area with respect to the wave band of the fingerprint detection light on the transmission path of the fingerprint detection light, and the fingerprint recognition module 1 is located below the light-transmitting area of the display module 31, so that the fingerprint detection light is transmitted to the fingerprint recognition module 1 through the display module 31.

Specifically, in this embodiment, the light-transmitting area may be an area corresponding to a transmission path of the fingerprint detection light on the OLED screen 3, and in general, a light-transmitting gap is formed between OLED pixel units on the OLED panel of the display module 31, and the fingerprint detection light may be transmitted to the fingerprint recognition module 1 below through the light-transmitting gap; if the display module 31 further includes other non-transparent layers, the non-transparent layers may be provided with transparent regions that can transmit the wavebands of the fingerprint detection light and the detection light in the transmission path of the fingerprint detection light and the detection light emitted by the detection light source 2, for example, a transparent window is provided.

As shown in fig. 2, in some embodiments, the OLED screen 3 may further include a support plate 33, where the support plate 33 is disposed at the back of the display module 31, for supporting and protecting the display module 31. Through setting up backup pad 33 at the display module 31 back, the opposite side that the display module 31 was facing away from protection apron 32 promptly, utilize backup pad 33 to support display module 31 to guarantee that each layer of optical film piece that constitutes display module 31 has better roughness, in order to improve the display effect of display module 31.

The support plate 33 may be generally made of a metal material having superior strength and rigidity, and for example, the support plate 33 may be a steel plate. And the supporting plate 33 is provided with a through hole 331, and the position of the through hole 331 corresponds to the light entering area of the fingerprint identification module 1. Taking the fingerprint detection light transmitted down to the fingerprint recognition module 1 as an example, the through hole 331 may be located between the fingerprint detection area 111 of the OLED screen 3 and the fingerprint recognition module 1, and the position of the through hole 331 may be opposite to the fingerprint recognition module 1.

After passing through the display module 31, the fingerprint detection light reflected by the finger 4 irradiates the fingerprint identification module 1 through the through hole 331 in the support plate 33, so that the fingerprint identification module 1 can receive the fingerprint detection light.

It should be noted that, in this embodiment, two light supplementing modes of the OLED screen 3 emitting light and detecting the non-visible light emitted by the light source 2 are adopted, and the light emitted by the two modes can be respectively used as the excitation light for fingerprint identification alone, or the light emitted by the two modes can be combined to be used as the excitation light for fingerprint identification, so that the problem that the OLED screen 3 emits light to supplement light alone can be very dazzling in dark light environments such as the night and in the state that the OLED screen 3 is a black screen can be solved.

Moreover, by using the visible light emitted from the self-luminous pixel unit (i.e., the OLED pixel unit) of the OLED screen 3 as the excitation light for fingerprint recognition, since the visible light emitted from the OLED screen 3 directly illuminates the finger 4 above the screen, the finger 4 reflects or scatters the visible light and passes through the OLED screen 3 to reach the fingerprint recognition module 1 below the screen, and thus the OLED screen 3 self-luminescence is adopted for fingerprint image acquisition, and the light passes through the OLED screen 3 only once.

The light emitted by the detection light source 2 disposed below the OLED screen 3 needs to pass through the OLED screen 3 to irradiate the finger 4 above the screen, the light returned by the finger 4 needs to pass through the OLED screen 3 to reach the fingerprint recognition module 1, and the light needs to pass through the OLED screen 3 twice, so that the intensity of the light emitted by the detection light source 2 needs to be large enough to enable the intensity of the light after passing through the OLED screen 3 twice to still realize fingerprint imaging.

Therefore, compared with the mode of independently adopting the detection light source 2 to emit the invisible light for light supplementing, when the ambient light brightness is better or the OLED screen is in a bright screen state, the OLED screen 3 is adopted to emit light as the excitation light for fingerprint identification, so that the power consumption of the fingerprint identification device can be reduced, and the electric energy consumed by the fingerprint identification device is saved.

In addition, the OLED screen 3 is adopted to perform screen lighting, the coverage area of light spots formed by the self-luminous pixel units of the OLED screen 3 at the position corresponding to the fingerprint detection area 111 is wider, the emergent angles of light rays are more consistent, the uniformity of formed excitation light is good, the fingerprint image acquisition effect can be improved, and the fingerprint identification accuracy can be improved.

According to the under-screen fingerprint identification device, the detection light source is arranged below the OLED screen, the detection light emitted by the detection light source is invisible light, when the OLED screen is in a dark light environment and is in a black screen state, the invisible detection light can be emitted by the detection light source as excitation light for fingerprint identification, and the fingerprint above the fingerprint detection area of the OLED screen is irradiated to form fingerprint detection light, so that the brightness of light spots formed in the fingerprint detection area can be reduced, no dazzling light spots can be formed, discomfort can not be caused to eyes in the dark environment, and the user experience effect can be improved.

Example two

As shown in fig. 2, the fingerprint recognition module 1 may include a fingerprint sensor 11, and the fingerprint sensor 11 may be an optical fingerprint sensor 11. The fingerprint sensor 11 may include an optical sensing array having a plurality of sensing units, and a reading circuit and other functional circuits electrically connected to the optical sensing array. The sensing area of the optical sensing array may correspond to the fingerprint recognition area of the fingerprint sensor 11.

Specifically, the fingerprint sensor 11 may be located below the fingerprint detection area 111 of the OLED screen 3, for example, the fingerprint sensor 11 is disposed opposite to the fingerprint detection area 111 of the OLED screen 3, by placing the finger 4 above the fingerprint detection area 111 of the OLED screen 3, fingerprint detection light carrying fingerprint information formed by irradiation of the finger 4 is transmitted to the fingerprint sensor 11 opposite to the fingerprint detection area 111 below the OLED screen 3 through the OLED screen 3, and the fingerprint detection light is received by an optical sensing array of the fingerprint sensor 11 to collect a fingerprint image of the finger 4.

The sensing area of the optical sensing array in the fingerprint sensor 11 is used to sense fingerprint detection light, which may be non-visible detection light emitted by the detection light source 2 or visible light emitted by the OLED pixel unit of the OLED screen 3 in the fingerprint detection area 111. In order to improve the fingerprint recognition effect of the fingerprint sensor 11, in this embodiment, the fingerprint recognition module 1 may further be provided with a filter 12.

The filter 12 is disposed on the light incident side of the fingerprint sensor 11, and is used for filtering out interference light in the fingerprint detection light, i.e. filtering out light in other bands except for forming the fingerprint image. In the present embodiment, fingerprint detection light is formed by non-visible detection light emitted from the detection light source 2 reflected by the finger 4 or visible light emitted from the OLED pixel unit of the OLED screen 3, and thus, other light than the light corresponding to the wavelength bands of the detection light and the visible light is interference light.

In this regard, the filter 12 may be a dual-pass filter 12, and specifically, the filter 12 may transmit the wavelength bands of the detection light and the visible light, and filter out the light of other wavelength bands except the detection light and the visible light. Taking the detection light source 2 as an infrared light source, the detection light emitted by the detection light source 2 is exemplified by infrared light, and the filter 12 is a dual-pass filter 12 that can transmit infrared light and visible light.

The filter 12 may specifically include one or more optical filters, for example, the optical filters may be configured as dual bandpass filters to simultaneously transmit non-visible detection light and visible light while filtering out other bands of light. The optical filter may be implemented, for example, by an optical filter coating that may be formed on one or more continuous interfaces, or may be formed on one or more discrete interfaces.

As shown in fig. 2, in this embodiment, the fingerprint recognition module 1 may further include an optical element 13, where the optical element 13 may be disposed on the light incident side of the fingerprint sensor 11 as an optical path guiding structure, that is, the optical element 13 is disposed on the side of the fingerprint sensor 11 facing the OLED screen 3. The optical element 13 is mainly used for guiding fingerprint detection light to the optical sensing array of the fingerprint sensor 11 for optical detection.

The optical element 13 may take a variety of embodiments. Taking the example of a Lens-type optical path in which the optical element 13 employs an optical Lens, in one possible embodiment, the optical element 13 may comprise an optical Lens (Lens) assembly having one or more Lens units, which may be a Lens group consisting of one or more aspherical lenses.

The optical lens assembly is used for reflecting the finger 4 to form and converging fingerprint detection light passing through the OLED screen 3 to the optical sensing array of the fingerprint sensor 11 below the finger 4, so that the optical sensing array can perform optical imaging based on the fingerprint detection light, and a fingerprint image of the finger 4 is obtained.

The optical lens assembly may further be formed with a pinhole or a microporous diaphragm in the optical path of the lens unit, for example, one or more light shielding sheets may be formed in the optical path of the lens unit, wherein at least one light shielding sheet may be formed with a light-transmitting micropore in the optical axis or optical center area of the lens unit, and the light-transmitting micropore may serve as the pinhole or microporous diaphragm. The pinhole or the microporous diaphragm may be matched with the optical lens assembly and/or other optical film layers above the optical lens layer to increase an optical field of View (FOV) of the fingerprint identification module 1, and be matched with the optical lens assembly to enhance a spatial resolution of a fingerprint image obtained by the optical sensing array, so as to improve a fingerprint imaging effect of the fingerprint identification module 1.

In another possible embodiment, the optical element 13 may be specifically a Collimator (Collimator) layer fabricated on a semiconductor silicon wafer or other substrate, which has a plurality of collimating units, and the collimating units may be specifically collimating through holes 331 having a certain aspect ratio.

When a user performs fingerprint identification on the OLED screen 3, among fingerprint detection light which is formed by reflection of the finger 4 above the OLED screen 3 and transmitted through the OLED screen 3, the fingerprint detection light with an incidence angle substantially consistent with the extending direction of the collimating unit can pass through the collimating unit and be received by the optical sensing array of the fingerprint sensor 11 below the collimating unit, and the fingerprint detection light with an excessive incidence angle is attenuated by multiple reflections inside the collimating unit, so that each sensing unit of the optical sensing array can only substantially receive the fingerprint detection light formed by the fingerprint pattern directly above the sensing unit, and the optical sensing array can acquire the fingerprint image of the finger 4 by using the fingerprint detection light passing through each collimating unit.

In other embodiments, the optical element 13 may specifically further include a Micro-Lens layer and an optical film layer, the Micro-Lens layer including a Micro-Lens array formed of a plurality of Micro-lenses, which may be formed over the optical sensing array of the fingerprint sensor 11112 by a semiconductor growth process or other process, and each Micro-Lens may respectively correspond to one or more sensing units of the optical sensing array.

An optical film layer may be formed between the microlens layer and the optical sensing unit, and may include at least one light blocking layer having micro holes, and a dielectric layer, passivation layer, buffer layer, or the like formed between the light blocking layer and the microlens layer and the optical sensing array, wherein the at least one light blocking layer having micro holes adopts a specific optical design to form micro holes between their corresponding microlenses and sensing units, thereby defining a receiving light path of the sensing unit.

The light blocking layer can block optical interference between adjacent microlenses and the sensing units, and the microlenses collect received light into the micropores at a specific angle vertical or inclined and transmit the light to the sensing units through the micropores for optical fingerprint imaging.

Thus, the fingerprint recognition module 1 in the present embodiment may include the fingerprint sensor 11, the filter 12, and the optical element 13. Wherein the fingerprint sensor 11, the optical element 13 and the filter 12 may be packaged in the same component to form the fingerprint recognition module 1. In this embodiment, the filter 12 may be installed under the optical element 13 to constitute an optical assembly.

Specifically, the optical filter 12 may be disposed between the optical element 13 and the fingerprint sensor 11, that is, after the fingerprint detection light reflected by the finger 4 passes through the OLED screen 3, the fingerprint detection light is first subjected to optical treatments such as focusing or collimation by the optical element 13, then the interference light is filtered by the optical filter 12, and then is incident on the fingerprint sensor 11, so that the fingerprint sensor 11 obtains a clear and accurate fingerprint image.

In other alternative embodiments, the filter may be disposed at other locations, and in some other embodiments, the filter may be fabricated on the surface of any optical component of the fingerprint recognition module 1, or disposed on an optical path of fingerprint detection light reflected by the finger 4 and transmitted to the fingerprint sensor 11.

For example, the filter may be disposed between the support plate 33 and the fingerprint sensor 11, or the filter may be attached to the rear surface of the display module 31, the front surface or the rear surface of the support plate 33, or the like.

Example III

Fig. 3 is a schematic structural diagram of an on-screen fingerprint recognition device according to a third embodiment of the present application; fig. 4 is a schematic diagram illustrating the arrangement of the detection light source corresponding to fig. 3.

As shown in fig. 3 and 4, in particular, the detection light source 2 and the fingerprint recognition module 1 may be disposed below the display module 31 of the OLED screen 3.

In addition, a flexible circuit board 34 is disposed at a side of the display module 31, for example, at a side of the display module 31, and below the protective cover 32, and the flexible circuit board 34 is connected to the display module 31 for providing an electrical signal to the display module 31 so that the display module 31 displays an image.

Taking the display device as an example of a mobile phone, the flexible circuit board 34 may be connected to the bottom edge area of the display module 31, that is, the flexible circuit board 34 is located at the chin portion of the mobile phone.

The detection light source 2 may be integrated inside the fingerprint recognition module 1, and it is understood that, for the fingerprint recognition module 1 packaged as a whole, the part of the fingerprint recognition module 1 corresponding to the detection light source 2 on the packaging structure should be capable of transmitting the detection light emitted by the detection light source 2, so that the detection light irradiates the OLED screen 3 through the fingerprint recognition module 1.

In some other embodiments, the detection light source 2 may be separately disposed, specifically, the detection light source 2 may be disposed at the periphery of the fingerprint recognition module 1, and the light emitting surface of the detection light source 2 faces the fingerprint detection area 111 on the OLED screen 3, so that the light emitted by the detection light source 2 may be irradiated to the finger 4 above the fingerprint detection area 111 through the OLED screen 3.

Since the detection light source 2 is disposed at the periphery of the fingerprint recognition module 1, the detection light emitted by the detection light source 2 needs to pass through the support plate 33, and for this purpose, the region of the through hole 331 formed in the support plate 33 should be capable of covering the fingerprint recognition module 1 and the detection light.

For example, as shown in fig. 3, only one through hole 331 may be formed in the supporting plate 33, the through hole 331 has a larger cross-sectional area, and the fingerprint identification module 1 and the detection light source 2 are located in the through hole 331 correspondingly; alternatively, the support plate 33 is provided with a plurality of through holes 331, and the positions of the through holes 331 correspond to the fingerprint recognition module 1 and the detection light source 2.

For the detection light source 2 to be located below the display module 31 of the OLED screen 3 and to be disposed at the periphery of the fingerprint recognition module 1, in order to make the layout of the under-screen fingerprint recognition device more compact, in a possible embodiment, the distance between the detection light source 2 and the fingerprint recognition module 1 may be 2mm-10mm.

The distance between the detection light source 2 and the fingerprint identification module 1 is relatively close, so that the light transmission area of the display module 31 is conveniently designed, and other components in the electronic device are conveniently arranged.

Illustratively, the distance between the detection light source 2 and the fingerprint recognition module 1 is 3mm, 5mm, 7mm, 9mm, or the like.

Whether the detection light source 2 is packaged inside the fingerprint recognition module 1 or the detection light source 2 is disposed at the periphery of the fingerprint recognition module 1, the number of the detection light sources 2 is not limited in this embodiment, and one or more detection light sources 2 may be used.

Specifically, the setting may be performed according to the power of the probe light required for fingerprint recognition, that is, the light emission power of the single detection light source 2, for example, the light emission power of the single detection light source 2 may be large, only one detection light source 2 may be provided, or the light emission power of the single detection light source 2 may be small, and two or more detection light sources 2 may be provided.

For the number of the detection light sources 2 is multiple, and the multiple detection light sources 2 are arranged at the periphery of the fingerprint identification module 1, specifically, the multiple detection light sources 2 can be arranged in a row or a column in parallel, or the multiple detection light sources 2 are circumferentially distributed at the periphery of the fingerprint identification module 1, and different detection light sources 2 are located at different directions of the fingerprint identification module 1.

As shown in fig. 3 and 4, in one embodiment, a plurality of detection light sources 2 may be aligned in a width direction or a length direction of the OLED screen 3. Taking the electronic device as a mobile phone and the fingerprint detection area 111 being located on the OLED screen 3 near the bottom end of the mobile phone as an example, the plurality of detection light sources 2 may be arranged on the left side or the right side of the fingerprint identification module 1 along the length direction of the OLED screen 3, that is, the plurality of detection light sources 2 are correspondingly arranged on the left side or the right side of the fingerprint detection area 111; alternatively, the plurality of detection light sources 2 may be arranged above or below the fingerprint recognition module 1 in the width direction of the OLED screen 3.

Thus, the arrangement of the detection light source 2 is more compact, the overall arrangement of the detection light source 2 and the fingerprint identification module 1 is also more compact, the arrangement of the detection light source 2 and the fingerprint identification module 1 is facilitated, the arrangement of the through holes 331 on the support plate 33 and the setting of the light transmission area for transmitting the detection light in the display module 31 are facilitated.

Wherein the spacing between adjacent detection light sources 2 may be equal. When setting up a plurality of detection light sources 2, the interval between the adjacent detection light sources 2 can be equal, and detection light sources 2's arrangement is more regular like this, can encapsulate a plurality of detection light sources 2 in an overall structure, take four LED lamp pearls as an example, can be with equidistant setting of these four LED lamp pearls on a lamp strip.

As shown in fig. 3, by setting the detection light source 2 and the fingerprint recognition module 1 together below the display module 31, the distance between the detection light source 2 and the fingerprint recognition module 1 is better controlled, the fingerprint recognition module 1 can be set at any position below the display module 31, and the position of the detection light source 2 can be set along with the position of the fingerprint recognition module 1, so that the setting of the under-screen fingerprint recognition device is more flexible.

It should be noted that, since the detection light source 2 is disposed below the display module 31, the detection light emitted by the detection light source 2 needs to penetrate the display module 31, and when the OLED screen 3 is in the bright screen state, the invisible detection light emitted by the detection light source 2 is used as the excitation light for fingerprint identification, in order to avoid the influence caused by the current of the pixel point of the display module 31 due to the overlarge light emitting power of the detection light source 2, the control circuit of the pixel point is prevented from being activated and turned on due to the overlarge light emitting power of the detection light source, so that the overcurrent of the pixel point is caused.

It can be understood that when the OLED screen 3 uses the invisible probe light emitted by the detection light source 2 as the excitation light for fingerprint recognition in the black screen state, the control circuit of the pixel point of the OLED screen 3 is turned off, so that the light emitting power of the probe light does not affect the pixel point of the OLED screen 3.

Example IV

fig. 6 is a schematic diagram illustrating the arrangement of the detection light source corresponding to fig. 5.

As shown in fig. 5 and 6, unlike the third embodiment in which the detection light source 2 is disposed below the display module 31 together with the fingerprint recognition module 1, in this embodiment, the detection light source 2 may be disposed beside the display module 31 and below the edge region of the protective cover 32.

In this embodiment, the detection light source 2 is disposed at a side of the display module 31 and below an edge area of the protective cover 32, for example, in the case of a mobile phone, the detection light source 2 may be disposed at a bottom end of the mobile phone, that is, in a non-display area of a chin portion of the mobile phone, so as to implement a chin lighting manner.

Through setting up detection light source 2 in the marginal region below of protection apron 32, detection light source 2 sets up or the light path is led through certain luminous angle, can make its probe light that sends just can shine finger 4 above the fingerprint detection region 111 with permeating protection apron 32, and the transmission path of light is shorter, and because protection apron 32's transmittance is better, therefore higher to the utilization ratio of light.

In addition, when the detection light irradiates the finger 4, the transmission path of the light only passes through the protective cover plate 32, no matter the OLED screen 3 is in a bright screen state or a black screen state, the detection light has no influence on the control circuit of the pixel point of the display module 31, the OLED screen 3 can adopt the detection light emitted by the detection light source 2 as the excitation light for fingerprint identification in any state, and the light emitting power of the detection light source 2 is not excessively limited.

Since the detection light source 2 is directly disposed below the protective cover plate 32 and the detection light source 2 is limited in the space range beside the display module 31, in order to satisfy that the detection light emitted by the detection light source 2 can irradiate the finger 4 above the fingerprint detection area 111, and the fingerprint detection light formed by the reflection of the finger 4 can be transmitted to the fingerprint recognition module 1, in this embodiment, the distance between the fingerprint recognition module 1 and the edge of the protective cover plate 32 corresponding to the detection light source 2 may be less than or equal to 15mm.

Since the detection light source 2 is disposed below the edge area of the protective cover 32, and the detection light emitted by the detection light source 2 should be irradiated to the finger 4 above the fingerprint detection area 111 through the protective cover 32, in order to satisfy that the detection light can be irradiated to the fingerprint detection area 111, the distance between the fingerprint detection area 111 and the edge area of the protective cover 32 should be relatively close, and correspondingly, the distance between the fingerprint identification module 1 and the edge of the protective cover 32 should also be relatively close, so that the detection light can be irradiated to the finger 4 above the fingerprint detection area 111, and the fingerprint detection light reflected by the finger 4 can be transmitted to the fingerprint identification module 1.

Specifically, the distance between the fingerprint recognition module 1 and the edge of the protective cover 32 should be less than or equal to 15mm, and it is understood that the edge of the protective cover 32 herein refers to the edge of the protective cover 32 corresponding to the detection light source 2.

As shown in fig. 5, in this embodiment, the detection light emitted by the detection light source 2 is non-visible light, and in order to make the detection light better penetrate through the protection cover plate 32, in a possible embodiment, a light-transmitting film layer 35 may be disposed on the back surface of the protection cover plate 32 corresponding to the edge area of the detection light source 2, where the light-transmitting film layer 35 is used to penetrate the detection light.

By providing the light-transmitting film layer 35 in the edge area of the back surface of the protective cover plate 32 on the side where the detection light source 2 is provided, the light-transmitting film layer 35 can transmit the invisible detection light emitted by the detection light source 2, and the detection light is illustratively infrared light, and the light-transmitting film layer 35 can be a film layer capable of transmitting infrared light. So, more easily detect light and shine to the protection apron 32 through printing opacity rete 35, simultaneously, printing opacity rete 35 can prevent the light of other wave bands except the detection light to pass, consequently can effectively filter interference light, can improve the transmission efficiency of detection light, improves fingerprint identification's efficiency and accuracy.

As for the number and arrangement of the detection light sources 2, as in the third embodiment, the present embodiment is not particularly limited as to the number and arrangement of the detection light sources 2 disposed under the edge region of the protective cover 32, the number of the detection light sources 2 may be one or more, the detection light sources 2 may have various arrangements such as arrangement along a straight line, multi-row distribution or annular arrangement, and the interval between adjacent detection light sources 2 may be the same or different.

As shown in fig. 6, since the detection light source 2 is disposed in the non-display area on the side of the display device, for example, the detection light source 2 is disposed in the non-display area on the bottom end of the mobile phone, in order to reduce the width of the non-display area on the bottom end of the mobile phone, the arrangement of the plurality of detection light sources 2 is compliant with the trend of the overall screen, and the plurality of detection light sources 2 may be arranged on a straight line along the width direction of the mobile phone. As an alternative embodiment, the detection light source 2 may be disposed outside the flexible circuit board 34, for example, attached to an outer side surface of the flexible circuit board 34.

Example five

Fig. 7 is a flowchart of a fingerprint identification method according to a fifth embodiment of the present application; fig. 8 is a control flow chart of a fingerprint identification method according to a fifth embodiment of the present application.

As shown in fig. 7 and 8, the present embodiment provides a fingerprint identification method, and the fingerprint identification method provided in the present embodiment is used in the on-screen fingerprint identification apparatuses provided in the first to fourth embodiments.

Specifically, the fingerprint identification method comprises the following steps:

and S100, when the finger 4 is positioned above the fingerprint detection area 111 of the OLED screen 3, acquiring the environment information of the OLED screen 3, wherein the environment information comprises the current illumination environment and the luminous state of the OLED screen.

In this embodiment, when fingerprint identification is required, the electronic device may provide excitation light or detection light required for fingerprint identification by polishing a finger above the OLED screen 3 in two ways. One is to use the visible light emitted from the OLED pixels of the OLED screen 3 of the electronic device in the fingerprint detection area 111 as the excitation light for fingerprint recognition, and the other is to use the invisible probe light emitted from the detection light source 2 as the excitation light for fingerprint recognition to illuminate the finger 4.

It should be understood that these two modes may be performed separately, that is, when fingerprint recognition is performed, the visible light emitted by the OLED pixels of the OLED screen 3 located in the fingerprint detection area 111 may be used for performing separate screen lighting, or the invisible detection light emitted by the detection light source 2 may be used for performing separate external light filling. Alternatively, the two modes can be performed simultaneously, that is, when fingerprint identification is performed, the visible light emitted by the OLED pixels of the OLED screen 3 located in the fingerprint detection area 111 and the invisible detection light emitted by the detection light source 2 can be used together to form excitation light for fingerprint identification to polish the finger above the OLED screen 3. This embodiment is not limited thereto.

Specifically, when the finger 4 is pressed against the OLED screen 3 above the fingerprint detection area 111 during fingerprint recognition, at this time, it is determined whether the detection light source 2 needs to be turned on to generate invisible detection light as excitation light for fingerprint recognition, i.e., whether the detection light needs to be irradiated to the finger 4 above the fingerprint detection area 111 through the OLED screen 3, according to the acquired environmental information of the OLED screen 3.

The environment information of the OLED screen 3 includes an illumination environment and a screen lighting state, where the illumination environment is an illumination condition of an environment where the OLED screen 3 is located, and the illumination environment may include a bright light environment and a dark light environment, for example, the bright light environment is a condition of good ambient light brightness such as a room with sufficient light in daytime or nighttime, and the dark light environment may include a condition of night or insufficient light.

In a specific embodiment, the lighting environment can determine whether the current lighting environment is in a bright light environment or a dark light environment by detecting the current environment light intensity, and as an alternative embodiment, the current system time information can also be obtained to determine whether the current lighting environment is in the daytime or at night, and the current specific lighting environment information is determined by combining the detected environment light intensity.

The screen lighting state is an operating state or a lighting state of the OLED screen 3 itself, for example, the screen lighting state may include that the OLED screen 3 is in a bright screen state or a dark screen state.

And S200, selecting at least one of visible light emitted by OLED pixels of the OLED screen in the fingerprint detection area and invisible detection light emitted by the detection light source as excitation light for fingerprint identification according to the environment information of the OLED screen, and irradiating the finger above the fingerprint detection area with the excitation light.

When it is determined that the first preset condition is met according to the current environmental information of the OLED screen 3 and the detection light source 2 needs to emit detection light as excitation light for fingerprint identification, the detection light source 2 is turned on, and the detection light source 2 emits light to generate invisible detection light, so that the detection light irradiates the finger 4 above the fingerprint detection area 111 through the OLED screen 3.

In one possible implementation manner, the control of the detection light source to emit the detection light according to the environmental information of the OLED screen 3 may specifically include:

and judging whether the OLED screen is in a dark light environment or not and whether the OLED screen is in a black screen state or not.

The environment information of the OLED screen 3 includes an illumination environment and a screen lighting state, in this embodiment, whether the detection light emitted by the light source 2 needs to be detected is determined according to the illumination environment and the screen lighting state of the OLED screen 3, specifically, whether the first preset condition is met currently is determined according to whether the illumination environment where the OLED screen is currently located is a dark light environment and whether the screen lighting state is a black screen state, so as to determine whether the detection light needs to be generated by using the detection light source 2.

When fingerprint identification is performed, that is, when the finger 4 is pressed above the fingerprint detection area 111, if the OLED screen 3 is in a dark light environment and the OLED screen 3 is in a black screen state, it may be determined that the detection light source 2 needs to be turned on when the first preset condition is met, so as to perform external lighting through detection light emitted by the detection light source 2.

If the OLED screen 3 is not in the above state, that is, the OLED screen 3 is in at least one of a bright light environment or the OLED screen 3 is in a bright screen state, it may be determined that the detection light source 2 is not required to be turned on when the second preset condition is currently satisfied, and the screen is lighted by the visible light emitted by the OLED screen 3.

As an example, to more quickly and effectively determine whether the OLED screen 3 is in a dark environment, in a possible implementation manner, determining whether the illumination environment is a dark environment may include:

acquiring the current system time of the electronic device;

and judging whether the current system time of the electronic device is at night.

Therefore, when fingerprint identification is performed, whether the detection light source 2 needs to be started or not can be more quickly and effectively judged according to the system time of the electronic device.

If the current system time of the electronic device is at night, it can be automatically determined that the OLED screen 3 is in a dark light environment, and if the OLED screen 3 is in a black screen state, the detection light source 2 needs to be turned on to generate the detection light.

If the current system time of the electronic device is not at night, detecting the intensity of the ambient light of the OLED screen, judging whether the illumination environment is a dark light environment according to the ambient light intensity, and then combining the bright screen state or the black screen state of the OLED screen 3 to specifically judge whether the detection light source 2 needs to be started.

For example, when the current system time of the electronic device is daytime, but the OLED screen 3 is in a dark environment, or the OLED screen 3 is blocked by a light blocking object, at this time, the intensity of the environment where the OLED screen 3 is located is weak, which can be determined as a dark environment, and the detection light source still needs to be turned on.

In a specific application, for the measurement of the ambient light intensity where the OLED screen 3 is located, the ambient light intensity may be measured by an ambient light sensor provided in an electronic device on which the OLED screen 3 is mounted.

It should be noted that, when the system time of the electronic device where the OLED screen 3 is located is night and the OLED screen 3 is in the condition that no external light source is illuminated, the OLED screen 3 is actually in a dark light environment, and at this time, the detection light source 2 is turned on to emit invisible detection light as excitation light for fingerprint identification, so that the light spot brightness formed in the fingerprint detection area 111 can be effectively reduced, and the user experience effect is improved.

When the system time of the electronic device where the OLED screen 3 is located is night, but the OLED screen 3 is illuminated by an external light source, the OLED screen 3 is in a bright environment, and the detection light source 2 is turned on to emit detection light, so that fingerprint collection can be realized.

S300, receiving fingerprint detection light carrying fingerprint information of the finger, which is formed by irradiating the finger with excitation light, and collecting a fingerprint image of the finger based on the fingerprint detection light.

Example six

On the basis of the first to fourth embodiments, the present embodiment provides an off-screen fingerprint recognition system, which includes the OLED screen 3 and the off-screen fingerprint recognition device described in the first to fourth embodiments.

In particular, the present embodiment may refer to the descriptions of the off-screen fingerprint recognition device and the OLED screen 3 in the first to fourth embodiments, and in the present embodiment, the off-screen fingerprint recognition device and the OLED screen 3 will not be further described.

The fingerprint identification device under the screen comprises a fingerprint identification module 1 and a detection light source 2, wherein detection light emitted by the detection light source 2 is invisible light, for example, the detection light is infrared light. The OLED screen 3 includes a display module 31 and a protective cover plate 32 covering the display module 31.

The detection light source 2 may be disposed below the display module 31 together with the fingerprint recognition module 1, or the detection light source 2 may be disposed below an edge region of the protective cover 32, lateral to the display module 31.

By providing the detection light source 2, the detection light source 2 can emit non-visible light, and when the OLED screen 3 is in a dark light environment and the OLED screen 3 is in a black screen state, the detection light source 2 can be turned on, and the finger 4 above the fingerprint detection area 111 of the OLED screen 3 is irradiated with the detection light emitted by the detection light source 2. Because the detection light is invisible light, the spot brightness formed in the fingerprint detection area 111 can be effectively weakened, and the user experience effect is improved.

The fingerprint identification system under screen that this embodiment provided, including OLED screen and fingerprint identification device under screen, through setting up the detection light source below the OLED screen, and the detection light that detects light source emission is non-visible light, when the OLED screen is in the dim light environment and is the black screen state, can send the finger of the fingerprint detection area top of non-visible detection light irradiation OLED screen through the detection light source, therefore can reduce the luminance of the facula that forms at the fingerprint detection area, can not form the facula that is dazzling, therefore can not cause discomfort to the human eye under dark environment, can improve user experience effect.

Example seven

Further, on the basis of the foregoing embodiments, the present embodiment provides an electronic device, which includes the under-screen fingerprint recognition device according to any one of the first to fourth embodiments.

The electronic device may include an OLED screen 3 and an off-screen fingerprint recognition device, wherein the OLED screen 3 includes a display module 31 and a protective cover plate 32 covering the display module 31; the under-screen fingerprint identification device comprises a fingerprint identification module 1 and a detection light source 2, wherein detection light emitted by the detection light source 2 is non-visible light, the fingerprint identification module 1 is arranged below the display module 31, and the detection light source 2 and the fingerprint identification module 1 can be arranged below the display module 31 together, or the detection light source 2 is arranged below the edge area of the protection cover plate 32 and beside the display module 31.

In this embodiment, the electronic device may be an electronic product or a component including a mobile phone, a tablet computer, a television, a notebook computer, a digital camera, a navigator, a fingerprint lock, etc. of the OLED screen 3.

In this embodiment, the electronic device may obtain fingerprint information of the user based on the on-screen fingerprint recognition system of the OLED screen 3, and may further perform fingerprint matching verification, so as to complete identity verification of the current user, so as to facilitate confirmation of whether the current user has permission to perform corresponding operation on the electronic device.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. An under-screen fingerprint identification device is suitable for an electronic device with a self-luminous display screen, and is characterized in that a fingerprint detection area of the under-screen fingerprint identification device is at least partially positioned in a display area of the self-luminous display screen;

the under-screen fingerprint identification device comprises a fingerprint identification module and a detection light source, wherein the fingerprint identification module is arranged below the self-luminous display screen, the detection light source is used for providing invisible detection light, and at least one of the detection light and visible light emitted by partial self-luminous display pixels of the self-luminous display screen can be used as excitation light for fingerprint identification according to the current environmental information of the self-luminous display screen and irradiates a finger above a fingerprint detection area so as to form fingerprint detection light carrying fingerprint information on the finger; the fingerprint identification module is used for receiving the fingerprint detection light carrying fingerprint information so as to collect fingerprint images of the finger; the environment information of the self-luminous display screen comprises the current illumination environment of the self-luminous display screen and the luminous state of the self-luminous display screen;

When the current environment information of the self-luminous display screen meets a first preset condition, the detection light source is used for providing invisible detection light as excitation light for fingerprint identification and irradiating the finger above the self-luminous display screen to generate fingerprint detection light; the first preset condition is that the self-luminous display screen is in a dark light environment currently and the self-luminous display screen is in a black screen state currently;

when the current environment information of the self-luminous display screen meets a second preset condition, the self-luminous display pixels of the self-luminous display screen, which are positioned in a fingerprint detection area, are driven to highlight the light spots, wherein the highlight light spots are used as excitation light for fingerprint identification and irradiate fingers above the self-luminous display screen to generate fingerprint detection light; the second preset condition is that the self-luminous display screen is in a bright light environment currently or in a bright screen state currently.

2. The under-screen fingerprint recognition device according to claim 1, wherein the self-luminous display screen and the detection light source are configured to be controlled to light a finger above the self-luminous display screen in a time-sharing manner under different environmental conditions, wherein the environmental conditions are related to environmental information of the self-luminous display screen.

3. The under-screen fingerprint recognition device according to claim 1, wherein the self-luminous display screen is an OLED screen, and the self-luminous pixel unit is an OLED pixel unit in which the OLED screen is located in the fingerprint detection area.

4. The device of claim 3, wherein the detection light source is an infrared light source, and the detection light emitted by the detection light source is infrared light, and the wavelength range of the infrared light is 850nm-940nm.

5. The device of claim 4, wherein the OLED screen includes a display module and a protective cover sheet covering the display module.

6. The device of claim 5, wherein the detection light source is disposed below the display module along with the fingerprint recognition module.

7. The device of claim 6, wherein the detection light source is integrated within the fingerprint recognition module.

8. The device according to claim 6, wherein the detection light source is disposed at the periphery of the fingerprint recognition module, and a distance between the detection light source and the fingerprint recognition module is 2mm-10mm.

9. The device according to claim 5, wherein the detection light source is disposed beside the display module and below the protective cover plate side by side with the display module, and wherein the detection light source is located below an edge area of the protective cover plate, and is configured to emit the detection light to a finger above the OLED screen through the protective cover plate.

10. The device according to claim 9, wherein a distance between the fingerprint recognition module and an edge of the protective cover plate corresponding to the detection light source is less than or equal to 15mm.

11. The device according to claim 10, wherein a light-transmitting film layer is disposed on the back surface of the protective cover plate corresponding to an edge area of the detection light source, and the light-transmitting film layer is configured to transmit the detection light.

12. The device according to claim 5, wherein the fingerprint recognition module comprises a fingerprint sensor and a filter, the fingerprint sensor is configured to receive the fingerprint detection light to obtain fingerprint information of the finger, the filter is disposed on an incident side of the fingerprint sensor, the filter is a two-pass filter having a first transmission band and a second transmission band, wherein the first transmission band corresponds to a visible light band emitted from a self-luminous display pixel of the self-luminous display screen, the second transmission band corresponds to a detection light band emitted from the detection light source, and the filter is configured to filter the detection light and interference light other than the visible light.

13. The device of claim 12, wherein the fingerprint recognition module further comprises an optical element disposed on an incident side of the fingerprint sensor for guiding or converging fingerprint detection light transmitted through the self-luminous display screen to the fingerprint sensor.

14. An off-screen fingerprint recognition system comprising a self-luminous display screen and an off-screen fingerprint recognition device as claimed in any one of claims 1 to 13, the off-screen fingerprint recognition device being arranged below the self-luminous display screen for enabling off-screen optical fingerprint detection.

15. The fingerprint identification method is suitable for an under-screen fingerprint identification device, and the under-screen fingerprint identification device is arranged below a self-luminous display screen, and is characterized by comprising the following steps:

acquiring environment information of the self-luminous display screen, wherein the environment information comprises a current illumination environment and a luminous state of the self-luminous display screen;

judging whether the environment information of the self-luminous display screen meets a first preset condition or not, wherein the first preset condition is that the self-luminous display screen is in a dark environment and the self-luminous display screen is in a black screen state;

When the first preset condition is met, controlling a detection light source to emit invisible detection light to serve as excitation light for fingerprint identification, and irradiating the excitation light to a finger above the self-luminous display screen to generate fingerprint detection light;

judging whether the current environment information of the self-luminous display screen meets a second preset condition, wherein the second preset condition is that the current self-luminous display screen is in a bright environment or the current self-luminous display screen is in a bright screen state;

taking visible light emitted by the highlight light spot as excitation light for fingerprint identification, and irradiating the visible light onto a finger above the self-luminous display screen to generate fingerprint detection light;

and receiving fingerprint detection light which is formed by irradiating the finger with the excitation light and carries fingerprint information of the finger, and collecting a fingerprint image of the finger based on the fingerprint detection light.

16. The fingerprint recognition method according to claim 15, wherein the self-luminous display screen and the detection light source are configured to be controlled to light a finger above the self-luminous display screen in a time-sharing manner under different environmental conditions, wherein the environmental conditions are related to environmental information of the self-luminous display screen.

17. The fingerprint recognition method according to claim 15, wherein the determining whether the environmental information of the self-luminous display screen currently satisfies a first preset condition comprises:

18. An electronic device comprising the off-screen fingerprint recognition system of claim 14.