WO2022183511A1

WO2022183511A1 - Fingerprint recognition apparatus and electronic device

Info

Publication number: WO2022183511A1
Application number: PCT/CN2021/079410
Authority: WO
Inventors: 杨方明; 青小刚
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2022-09-09

Abstract

A fingerprint recognition apparatus and an electronic device. The fingerprint recognition apparatus is disposed below a display screen of the electronic device, the display screen comprises a fingerprint detection area, and the fingerprint detection area comprises a first light-emitting area and a second light-emitting area. The fingerprint recognition apparatus comprises: an optical sensor comprising a first sensing area corresponding to the first light-emitting area; an optical path guiding structure provided above the optical sensor and used for guiding a first optical signal in a first returned optical signal to the first sensing area; and at least one first filter unit provided above at least one first pixel unit in the first sensing area, the first optical signal received by the at least one first pixel unit being used for performing fingerprint anti-counterfeiting authentication.

Description

Fingerprint identification devices and electronic equipment

technical field

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

Background technique

Optical fingerprints are easier to crack than capacitive fingerprints, especially 2D printing/extraction-like fake fingerprints that are cheap and easy to obtain pose a greater threat to optical fingerprints. With the gradual popularization of under-screen optical fingerprint unlocking and payment applications, the improvement of optical fingerprint security is imminent.

At present, the method of resisting 2D fake fingerprints using the principle of transmitted light can carry out a certain anti-counterfeiting authentication of real and fake fingers. However, the current anti-counterfeiting authentication scheme is relatively complex, and the corresponding fingerprint unlocking time is relatively long. Therefore, how to reduce the optical The complexity of fingerprint anti-counterfeiting authentication and the reduction of fingerprint unlocking time is a technical problem that needs to be solved urgently.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a fingerprint identification device and an electronic device, which can reduce the complexity of optical fingerprint anti-counterfeiting authentication.

In a first aspect, a fingerprint identification device is provided, the device is disposed below a display screen of an electronic device, the display screen includes a fingerprint detection area, and the fingerprint detection area includes a first light-emitting area and a second light-emitting area, wherein the The light emitted by the light-emitting display pixels in the first light-emitting area does not include the first color light component, the light emitted by the light-emitting display pixels in the second light-emitting area includes the first color light component, and the fingerprint identification device includes: an optical sensor, the optical sensor includes a first sensing area corresponding to the first light-emitting area; an optical path guiding structure is arranged above the optical sensor, and is used for converting the first optical signal in the first returned optical signal Guided to the first sensing area, the first returned light signal includes the reflected light signal and the transmitted light signal returned after the light emitted by the light-emitting display pixels in the first light-emitting area irradiates the finger, and the second The transmitted light signal returned after the light emitted by the light-emitting display pixels in the light-emitting area irradiates the finger; at least one first filter unit is arranged above the at least one first pixel unit in the first sensing area, wherein each Each first filter unit corresponds to one first pixel unit, the at least one first filter unit is used to pass only the first color light component, and the first light received by the at least one first pixel unit The signal is used for fingerprint anti-counterfeiting authentication.

The first sensing area acquires the first light signal, and receives the above-mentioned transmitted light signal on the first pixel unit provided with the first filter unit, because the light signal returned after the light irradiates the real finger may include the reflected light signal and the transmitted light signal. However, the optical signal returned after the light irradiates the fake 2D fingerprint is only the reflected optical signal. Therefore, the authenticity of the finger can be determined by the first optical signal received by the first pixel unit.

In the technical solutions of the embodiments of the present application, the difference in transmitted light formed after the finger is irradiated with light from light-emitting regions including light components of different colors, and then the transmitted light calculation is performed in combination with the data of the pixel unit provided with the filter unit, thereby realizing For fingerprint anti-counterfeiting authentication, compared with the anti-counterfeiting authentication methods in the prior art, the fingerprint identification device of the embodiment of the present application has lower complexity.

Optionally, the light-emitting area in this embodiment of the present application may refer to a light spot on the display screen.

In a possible implementation manner, the optical sensor further includes a second sensing area corresponding to the second light-emitting area, and the second sensing area includes a plurality of second pixel units; the optical path guiding structure It is also used for: guiding the second light signal in the second return light signal to the second sensing area, and the second return light signal is that the light emitted by the light-emitting display pixels in the first light-emitting area illuminates the finger The transmitted light signal returned after the second light-emitting area, and the reflected light signal and the transmitted light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area illuminates the finger; the second light signal received by the second pixel unit is used for for fingerprint identification of the finger.

In the embodiment of the present application, the anti-counterfeiting authentication is performed by the first optical signal received by the first pixel unit, and the fingerprint recognition is performed by the second optical signal received by the second pixel unit, thereby simultaneously realizing the processes of anti-counterfeiting authentication and fingerprint recognition, thereby reducing the number of fingerprints. Unlock time.

In a possible implementation manner, the first sensing area further includes a plurality of third pixel units, the first optical signal received by the third pixel unit and the first optical signal received by the second pixel unit The second optical signal is used for fingerprint identification of the finger.

In this embodiment of the present application, the pixel units in the first sensing area may all be first pixel units, or, in addition to at least one first pixel unit, may also include other third pixel units, and these third pixel units are related to The difference between the first pixel unit is that the first filter unit is not set on it, and the first optical signal obtained by the third pixel unit can also be used for fingerprint recognition, and the pixel units in the first sensing area are all the first. Compared with one pixel unit, the manner of including the third pixel unit can further improve the accuracy of fingerprint identification.

In a possible implementation manner, the light path guiding structure includes: a light-passing hole, and the light-passing hole makes the light emitted by the light-emitting display pixels in the first light-emitting area irradiated to the finger and returned to the reflected light The signal reaches the optical sensor through the light-passing hole, so that the reflected light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area is irradiated to the finger cannot pass through the light-passing hole to reach the optical sensor. Optical sensor.

The optical path guiding structure in the embodiment of the present application may include only one light-passing aperture, and by controlling the aperture size of the aperture, it is possible to prevent the reflected light signal from returning after the second light-emitting area is irradiated to the finger, so that the reflected light signal with the first light-emitting area can be prevented. The reflected light signal of the color spectrum is distinguished from the transmitted light signal, and then the principle of transmission of real fingers can be used to perform anti-counterfeiting authentication on real and fake fingers.

In a possible implementation manner, the optical path guiding structure further includes: a lens, disposed below the light-passing hole, for imaging the optical signal passing through the light-passing hole to the optical sensor.

In the embodiment of the present application, a lens may also be disposed under the small hole to enhance the light signal entering the optical sensor.

In this embodiment of the present application, in order to prevent the reflected light signal from the second light-emitting area irradiating the finger and returning to the first sensing area, the diameter range of the first light-emitting area and the angular range of the light signal received by the optical sensor need to be determined. And the range of the light-passing aperture is limited.

In a possible implementation manner, the optical path guiding structure includes: a microlens array; at least one light blocking layer, disposed below the microlens array, each light blocking layer in the at least one light blocking layer A pinhole array is provided; the microlens array and the pinhole array form a plurality of light guide channels corresponding to the pixel units of the optical sensor one-to-one, and the light guide channels are used to convert the first optical signal and/or the second light signal is directed to the corresponding pixel unit.

In addition to the above-mentioned one light-passing aperture, the optical path guiding structure in the embodiment of the present application may also include an array of apertures. In this case, each aperture corresponds to a pixel unit. The direction of the light guide channel formed with the small hole array can be set, so at least one light guide channel can be set to correspond to at least one first pixel unit in the first sensing area and receive the above-mentioned first light signal. , so as to realize the anti-counterfeiting authentication of the finger.

It should be understood that the first light-emitting area and the second light-emitting area in the embodiment of the present application may be located on the fingerprint detection area on the display screen. Further, the diameter of the fingerprint detection area in the embodiment of the present application may be between 10 mm and 16 mm.

Optionally, the fingerprint identification device in the embodiment of the present application may be applied to the lens system architecture.

In a possible implementation manner, the diameter of the light-transmitting hole is 0.1 mm˜0.5 mm.

In a possible implementation manner, the diameter of the first light-emitting region is 1 mm˜10 mm.

The diameter of the first light-emitting region in the embodiment of the present application may be 1 mm˜10 mm, so as to realize anti-counterfeiting authentication.

Optionally, the diameter range of the first light-emitting area can be further reduced to 2 mm˜5 mm, so as to ensure the anti-counterfeiting authentication and at the same time improve the performance of fingerprint recognition.

In a possible implementation manner, the angle of the returned light signal received by the optical sensor ranges from 20 degrees to 75 degrees.

Through reasonable configuration of the light-passing hole, the light-emitting area, and the angle at which the optical sensor receives the optical signal, the first sensing area can receive the above-mentioned first optical signal.

In a possible implementation manner, the diameter of the first sensing region is greater than 30um.

Optionally, the fingerprint identification device of the embodiment of the present application may also be applied to a device architecture of an ultra-thin structure.

In a possible implementation manner, each small hole in the small hole array has a diameter of 12.5um˜50um.

In a possible implementation manner, the radius of the first light-emitting region is greater than 100um.

In a possible implementation manner, the radius of the first sensing area is greater than 100um.

In a possible implementation manner, the first light-emitting area is located in a central area of the fingerprint detection area.

Optionally, the first light-emitting area in this embodiment of the present application may also be located at an edge area of the fingerprint detection area.

In a possible implementation manner, the diameter of the second light-emitting region is greater than 2.5 mm.

In a possible implementation manner, the diameter of the second sensing area is less than 930um.

In a possible implementation manner, the diameter of the second light-emitting region is less than 100um.

In a possible implementation manner, the radius of the second sensing area is less than 100um.

In a possible implementation manner, the second light-emitting area is located in a central area of the fingerprint detection area.

In a possible implementation manner, the fingerprint identification device further includes: a plurality of second filter units disposed above the plurality of second pixel units and/or the plurality of third pixel units, wherein , each second filter unit corresponds to a second pixel unit or a third pixel unit, and the at least one second filter unit is used to prevent the light component of the first color from passing through.

In the embodiment of the present application, a filter unit may also be provided above other pixel units except the first pixel unit, so as to filter out other color light components in the first filter unit and highlight the light obtained by the first sensing area The difference of the signal is beneficial to correct the result of the anti-counterfeiting authentication.

In a possible implementation manner, a plurality of the first filters are arranged above the plurality of the second pixel units in the second sensing region in a circle around the first sensing region unit, the plurality of first filter units correspond to the plurality of second pixel units one-to-one.

In this embodiment of the present application, a first filter unit may be provided above the pixel units in the second sensing area around the first sensing area, because the pixel units in the second sensing area can simultaneously receive light from the second light-emitting area The reflected light signal and the transmitted light signal after irradiating the finger, while the first pixel unit of the first sensing area can only receive the transmitted light signal after the finger is irradiated by the light from the second light-emitting area. Therefore, by comparing the two The difference between the first sensing areas can be more clearly distinguished, so as to realize the anti-counterfeiting authentication of the finger.

In a possible implementation manner, the optical path guiding structure further includes: an infrared cut-off filter layer disposed above the optical sensor for filtering out infrared light in ambient light.

It should be understood that the infrared cutoff filter layer in the embodiment of the present application can filter out most of the red light and the infrared light in the ambient light.

By filtering out infrared light in ambient light and filtering out infrared light in ambient light, fingerprint identification is ensured.

In a possible implementation manner, the ratio of the number of the at least one first filter unit to the total number of pixel units included in the first sensing area is less than a first threshold.

In the embodiment of the present application, by setting the proportion of all pixel areas of the first pixel unit in the first sensing area, fingerprint recognition can be achieved while anti-counterfeiting authentication is achieved.

In a possible implementation, the first threshold is 5%.

In a possible implementation manner, the area of the second light-emitting region is larger than that of the first light-emitting region.

By setting the area of the second light-emitting area to be larger than the area of the first light-emitting area, it is possible to realize the anti-counterfeiting authentication and at the same time ensure the normal operation of the fingerprint identification.

In a possible implementation manner, the area of the first light-emitting region is smaller than the field of view area of the optical sensor.

In a possible implementation manner, the first light-emitting area is distributed symmetrically with respect to the center point of the fingerprint detection area.

In a possible implementation manner, the first light-emitting area is square or circular.

In a possible implementation manner, the first color light component is any one of the following colors: pure red, pure blue, and pure green.

In a possible implementation manner, the color of the light emitted by the light-emitting display pixels in the second light-emitting area is a gradient color.

By setting the light of the second light-emitting area to gradually change toward the first light-emitting area, the difference of the light signal received by the optical sensor can be reduced, so that the fingerprint identification process is ensured while anti-counterfeiting authentication is realized.

In a possible implementation manner, the first filter unit or the second filter unit is a color filter material, and the color filter material includes a red filter material, a green filter material, and a blue filter material at least one of them.

It should be understood that the filter unit in the embodiment of the present application may be a filter material of pure color, or may also be a filter material obtained by mixing two or more colors.

In a possible implementation manner, the first filter unit or the second filter unit is a color filter, and the color filter is a red filter, a green filter and a blue filter one of the.

In a possible implementation manner, the fingerprint identification device further includes: a processor, configured to determine whether the finger is a light intensity of the first light signal received by the at least one first pixel unit real fingers.

In a possible implementation manner, if the light intensity of the first optical signal received by the at least one first pixel unit is greater than or equal to a preset value, the processor is configured to determine that the finger is a real finger; If the light intensity of the first optical signal received by the at least one first pixel unit is less than the preset value, the processor is configured to determine that the finger is a fake finger.

In a second aspect, an electronic device is provided, including: a display screen; and the fingerprint identification device in the first aspect or any possible implementation manner of the first aspect, where the fingerprint identification device is disposed below the display screen to achieve Under-screen optical fingerprint anti-counterfeiting authentication.

Description of drawings

FIG. 1 is a schematic plan view of an electronic device to which the present application can be applied.

FIG. 2 is a schematic cross-sectional view of the electronic device shown in FIG. 1 .

FIG. 3 is another schematic cross-sectional view of the electronic device shown in FIG. 1 .

Figure 4 is a schematic diagram of the optical path created by light irradiating a real finger touching an electronic device.

FIG. 5 is a schematic diagram of the optical path created by a 2D fake finger irradiating the surface of an electronic device with light.

FIG. 6 is a schematic side view of an electronic device according to an embodiment of the present application when fingerprint detection is performed.

FIG. 7 is a schematic front view of an electronic device according to an embodiment of the present application.

FIG. 8 is a schematic diagram of fingerprint detection using a real finger according to an embodiment of the present application.

FIG. 9 is a schematic diagram of fingerprint detection using a fake 2D fingerprint according to an embodiment of the present application.

FIG. 10 is another schematic diagram of fingerprint detection using a real finger according to an embodiment of the present application.

FIG. 11 is another schematic diagram of fingerprint detection using a fake 2D fingerprint according to an embodiment of the present application.

FIG. 12 is another schematic diagram of fingerprint detection using a real finger according to an embodiment of the present application.

FIG. 13 is another schematic diagram of fingerprint detection using a fake 2D fingerprint according to an embodiment of the present application.

FIG. 14 is another schematic diagram of fingerprint detection using a real finger according to an embodiment of the present application.

FIG. 15 is another schematic diagram of fingerprint detection using a fake 2D fingerprint according to an embodiment of the present application.

FIG. 16 is a schematic diagram of uneven light spot distribution according to an embodiment of the present application.

FIG. 17 is a schematic diagram of an arrangement of filter units according to an embodiment of the present application.

FIG. 18 is a schematic flowchart of a fingerprint anti-counterfeiting method according to an embodiment of the present application.

FIG. 19 is a schematic flowchart of fingerprint identification and anti-counterfeiting authentication according to an embodiment of the present application.

FIG. 20 is a schematic diagram of an electronic device according to an embodiment of the present application.

Detailed ways

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

It should be understood that the embodiments of the present application can be applied to optical fingerprint systems, including but not limited to optical fingerprint recognition systems and products based on optical fingerprint imaging. The embodiments of the present application only take the optical fingerprint system as an example for description, but should not be implemented in this application. The examples constitute any limitation, and the embodiments of the present application are also applicable to other systems using optical imaging technology, and the like.

As a common application scenario, the optical fingerprint system provided in the embodiments of the present application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other electronic devices; more specifically, in the above electronic devices, fingerprint identification The device may specifically be an optical fingerprint device, which may be arranged in a partial area or all areas below the display screen, thereby forming an under-display optical fingerprint system. Alternatively, the fingerprint identification device may also be partially or fully integrated into the display screen of the electronic device, thereby forming an in-display optical fingerprint system.

FIG. 1 is a schematic structural diagram of an electronic device to which this embodiment of the present application can be applied. The electronic device 10 includes a display screen 120 and an optical fingerprint module 130 , wherein the optical fingerprint module 130 is disposed in a part below the display screen 120 . area. The optical fingerprint module 130 includes an optical sensor, and the optical sensor includes a sensing array 133 having a plurality of optical sensing units 131 . As shown in FIG. 1 , the fingerprint detection area 103 is located in the display area of the display screen 120 . In an alternative embodiment, the optical fingerprint module 130 may also be disposed at other positions, such as the side of the display screen 120 or the non-light-transmitting area of the edge of the electronic device 10, and at least part of the display screen 120 is displayed through the optical path design. The light signal of the area is guided to the optical fingerprint module 130 , so that the fingerprint detection area 103 is actually located in the display area of the display screen 120 .

It should be understood that the area of the fingerprint detection area 103 may be different from the area of the sensing array of the optical fingerprint module 130. For example, through the optical path design of lens imaging, reflective folding optical path design, or other optical path designs such as light convergence or reflection, the optical path design can be The area of the fingerprint detection area 103 of the fingerprint module 130 is larger than the area of the sensing array of the optical fingerprint module 130 . In other alternative implementations, if the optical path is guided by, for example, light collimation, the fingerprint detection area 103 of the optical fingerprint module 130 can also be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130 .

Therefore, when the user needs to unlock the electronic device or perform other fingerprint verification, the user only needs to press the finger on the fingerprint detection area 103 located on the display screen 120 to realize the fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 using the above structure does not need to reserve a space on the front of the electronic device 10 to set the fingerprint button (such as the Home button), so that a full-screen solution can be adopted, that is, the display area of the display screen 120 can be basically Extends to the entire front of the electronic device 10 .

As an optional implementation manner, FIG. 2 shows a schematic cross-sectional view of the electronic device 10 shown in FIG. 1 . As shown in FIG. 2 , the optical fingerprint module 130 includes a light detection part 134 and an optical component 132, the light detection part 134 includes the sensing array, a reading circuit and other auxiliary circuits electrically connected with the sensing array, which can be fabricated on a chip (Die) by a semiconductor process; the optical component 132 can be It is arranged above the sensing array of the light detection part 134, which can specifically include a filter layer (Filter), a light guide layer and other optical elements, and the filter layer can be used to filter out ambient light that penetrates the finger, The light guide layer is mainly used for guiding the reflected light reflected from the surface of the finger to the sensing array for optical detection.

In specific implementation, the optical component 132 and the light detection part 134 may be packaged in the same optical fingerprint chip. Wherein, the light guide layer can be specifically a lens layer made of a semiconductor silicon wafer, which has a plurality of lens units, and the reflected light from the finger passes through the lens units and is absorbed by the optical unit below it. The sensing unit receives, according to which, the sensing array can detect the fingerprint image of the finger.

In the optical fingerprint module 130, each lens unit may correspond to one of the optical sensing units of the sensing array; alternatively, the lens unit and the optical sensing unit of the sensing array may also be used There is no one-to-one correspondence to reduce the interference of moire fringes. For example, one optical sensing unit can correspond to multiple lens units, or the lens units can also be arranged in an irregular manner; using irregularly arranged lens units can The reflected light detected by each sensing unit is corrected by a later software algorithm.

It should be understood that, in specific implementation, the terminal device 10 further includes a transparent protective cover plate 110, and the cover plate 110 may be a glass cover plate or a sapphire cover plate, which is located above the display screen 120 and covers all The front of the terminal device 10 is described. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing the cover plate 110 above the display screen 120 or the surface of the protective layer covering the cover plate 110 .

A structure of the optical fingerprint module 130 suitable for the lens system architecture of FIG. 2 according to the embodiment of the present application may include: an infrared filter (Infrared Filter, IR Filter), an IR filter adhesive, a chip (DIE) , DIE adhesive, flexible printed circuit board (Flexible Printed Circuit, FPC), reinforcing plate, bracket and lens system, etc.

It should be understood that the above-mentioned optical fingerprint module 130 may also include other parts, and reference may be made to the prior art for the specific structure thereof, which is not described in detail in this embodiment of the present application.

As another possible implementation manner, FIG. 3 shows another schematic cross-sectional view of the electronic device 10 shown in FIG. 1 , and the fingerprint device 130 may be a schematic diagram of an optical fingerprint module 130 applied to an ultra-thin structure. As shown in FIG. 3 , as an optional implementation manner, as shown in FIG. 3 , the optical fingerprint module 130 may include a light detection part 134 and an optical component 132 . The light detection part 134 includes the sensing array 133 (also referred to as an optical sensor), a reading circuit and other auxiliary circuits electrically connected to the sensing array 133, which can be fabricated on a chip ( Die), such as optical imaging chips or optical sensors. The optical component 132 may be disposed above the sensing array 133 of the light detection part 134, and may specifically include a filter layer (Filter), a light guide layer or a light path guide structure, and other optical elements, the filter layer. It can be used to filter out ambient light penetrating the finger, and the light guide layer or the light path guiding structure is mainly used to guide the reflected light reflected from the finger surface to the sensing array 133 for optical detection.

In some embodiments of the present application, the optical assembly 132 and the light detection part 134 may be packaged in the same optical fingerprint component. For example, the optical component 132 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 It is attached above the chip, or some components of the optical component 132 are integrated into the chip.

In some embodiments of the present application, the area or light sensing range of the sensing array 133 of the optical fingerprint module 130 corresponds to the fingerprint detection area 103 of the optical fingerprint module 130 . Wherein, the fingerprint detection area 103 of the optical fingerprint module 130 (or the fingerprint detection area 103 on the display screen 120 ) may or may not be equal to the area or light of the area where the sensing array 133 of the optical fingerprint module 130 is located. The sensing range is not specifically limited in this embodiment of the present application.

For example, the optical path is guided by light collimation, and the fingerprint detection area 103 of the optical fingerprint module 130 can be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130 .

For another example, the area of the fingerprint detection area 103 of the optical fingerprint module 130 can be made larger than that of the optical fingerprint module by, for example, optical path design of lens imaging, reflective folding optical path design, or other optical path designs such as light convergence or reflection. 130 of the area of the sensing array 133 .

On the other hand, the optical component 132 may further include other optical elements, such as a filter layer (Filter) or other optical films, which may be disposed between the optical path guiding structure and the optical sensor or disposed in the Between the display screen 120 and the optical path guiding structure, it is mainly used to isolate the influence of external interference light on the optical fingerprint detection. The filter layer can be used to filter out ambient light that penetrates the finger and enters the optical sensor through the display screen 120. Similar to the optical path guiding structure, the filter layer can be used for each optical sensor. The sensors are separately arranged to filter out interfering light, or a large-area filter layer can be used to cover the plurality of optical sensors simultaneously.

The fingerprint identification module 130 may be used to collect fingerprint information (such as fingerprint image information) of the user.

Taking the display screen 120 as an example of a display screen having a self-luminous display unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro-light-emitting diode (Micro-LED) display screen. The optical fingerprint module 130 can use the display unit (ie, the OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed on the fingerprint detection area 103, the display screen 120 emits a beam of light 111 to the target finger 140 above the fingerprint detection area 103, and the light 111 is reflected on the surface of the finger 140 to form reflected light or passes through all the The finger 140 is internally scattered to form scattered light (transmitted light). In the related patent application, for the convenience of description, the above-mentioned reflected light and scattered light are collectively referred to as return light. Since the ridges 141 and the valleys 142 of the fingerprint have different reflection capabilities for light, the returned light 151 from the fingerprint ridges and the returned light 152 from the fingerprint valleys have different light intensities, and the returned light passes through the optical component 132 Then, it is received by the sensing array 133 in the optical fingerprint module 130 and converted into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby The optical fingerprint recognition function is implemented in the electronic device 10 .

In other alternative solutions, the optical fingerprint module 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the optical fingerprint module 130 can be applied not only to self-luminous display screens such as OLED display screens, but also to non-self-luminous display screens, such as liquid crystal display screens or other passive light-emitting display screens.

In terms of specific implementation, the electronic device 10 may further include a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, which is located above the display screen 120 and covers the front surface of the electronic device 10 . Therefore, in the embodiments of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing the cover plate above the display screen 120 or the surface of the protective layer covering the cover plate.

It should also be understood that, in the embodiments of the present application, the sensing array in the optical fingerprint device may also be called a pixel array, and the optical sensing unit or sensing unit in the sensing array may also be called a pixel unit.

It should be noted that the optical fingerprint device in the embodiments of the present application may also be referred to as an optical fingerprint identification module, a fingerprint identification device, a fingerprint identification module, a fingerprint module, a fingerprint collection device, etc., and the above terms can be interchanged.

It should be understood that the above only describes two schematic structural diagrams to which the fingerprint identification device of the embodiment of the present application is applicable, but the embodiment of the present application is not limited thereto.

Figures 1 to 3 are only examples of the present application, and should not be construed as limiting the present application.

For example, the application does not specifically limit the number, size and arrangement of the optical sensors, which can be adjusted according to actual needs. For example, the optical fingerprint module 130 may include a plurality of optical sensors distributed in a square or a circle.

Considering that the principle of optical fingerprints is easier to crack than capacitive fingerprints, especially the low-cost and easy-to-obtain 2D printing/extraction-like fake fingerprints pose a greater threat to optical fingerprints. At present, it is possible to use the principle that the real finger will transmit light after being irradiated with light, while the fake D2 finger will not produce transmitted light after being irradiated by light, and the anti-counterfeiting authentication of the real finger and the 2D fake fingerprint can be carried out.

Specifically, as shown in FIG. 4 , still taking the electronic device 10 shown in FIGS. 1 to 3 as an example, considering that the real finger 140 touches the fingerprint detection area 103 on the display screen 120 , it is assumed that the display screen 120 includes The light-emitting display pixels are used to provide the light source for fingerprint recognition, then the light emitted by it (ie, the incident light indicated by the solid line in FIG. 5 ) irradiates the finger 140 and may be reflected at the fingerprint ridges and fingerprint valleys on the surface of the finger 140 and transmission, corresponding to the reflected light indicated by the dotted line and the transmitted light indicated by the dot-dash line in FIG.

However, as shown in FIG. 5 , if a 2D fake finger touches the fingerprint detection area 103 instead of a real finger touching the fingerprint detection area 103 on the display screen 120 for fingerprint recognition, the 2D fake finger is a plane, it is still assumed that the The light-emitting display pixels included in the display screen 120 are used to provide the light source for fingerprint identification, and after the light emitted by the display 120 illuminates the fake finger, only reflected light will be generated, that is to say, the light that the optical fingerprint device 130 can receive includes the source of the fake fingerprint. Reflected light by itself, not including transmitted light.

It should be understood that FIG. 4 and FIG. 5 only exemplarily show the reflected light and the transmitted light of the incident light in one direction, and the present application does not limit the quantity and angle of the incident light.

Therefore, for real fingers and 2D fake fingerprints, the real and fake fingerprints can be distinguished based on whether there is a transmitted light principle. After the light-emitting display pixels emit light in the fingerprint detection area 103 of the display screen 120 , the generated reflected light and transmitted light will be mixed together and cannot be extracted separately, resulting in the unavailability of the distinguishing principle. Moreover, the current method of using the principle of transmitted light for anti-counterfeiting authentication of real fingerprints and 2D fake fingerprints is relatively complex, and the corresponding fingerprint identification and unlocking time is long. Therefore, it is necessary to seek a new 2D fake fingerprint anti-counterfeiting method.

Therefore, the embodiments of the present application provide a fingerprint identification device, a fingerprint anti-counterfeiting method, and an electronic device, which perform fingerprint anti-counterfeiting authentication and fingerprint identification based on the difference in transmitted light between a real finger and a 2D fake fingerprint.

FIG. 6 shows a partial schematic diagram of the electronic device 20 according to an embodiment of the present application, and FIG. 6 is a side view of the electronic device 20. It should be understood that FIG. 6 only exemplarily shows the return light returned after the light irradiates the finger The schematic diagram of the signal, for the optical path structure of different structures, the return optical signal may be different, FIG. 6 in the embodiment of the present application only shows one possible mode, but the embodiment of the present application is not limited to this; FIG. 7 shows a front view of the electronic device 20 according to an embodiment of the present application. As shown in FIG. 6 and FIG. 7 , the electronic device 20 includes a display screen 200 and a fingerprint identification device 300 , and the display screen 200 is located above the fingerprint identification device 300 .

Specifically, the display screen 200 in FIG. 6 may represent a portion of the display screen 200 rather than the actual size and size of the display screen 200 ; FIG. 7 shows a front view of the display screen 200 . The display screen 200 may correspond to the display screen 120 in the electronic device 10 described above in FIGS. 1 to 3 , and is applicable to the above related descriptions about the display screen 120 , and for brevity, the details are not repeated here.

In addition, the electronic device 20 of the embodiment of the present application is described by taking the display screen 200 including several light-emitting display pixels capable of self-emitting light as an example, and the light-emitting display pixels can be used for displaying images. As shown in FIG. 6 and FIG. 7 , the display screen 200 includes a fingerprint detection area 210 for finger pressing, that is, when the user needs to unlock the electronic device 20 or perform other fingerprint recognition, he only needs to press his finger on the The fingerprint detection area 210 can realize fingerprint input. The fingerprint detection area 210 may correspond to the fingerprint detection area 103 in the electronic device 10 described in FIG. 1 to FIG. 3 , and is applicable to the above related description about the fingerprint detection area 103 , and is not repeated here for brevity.

In this embodiment of the present application, as shown in FIG. 7 , the display screen 200 includes a plurality of light-emitting display pixels, the display screen 200 includes a fingerprint detection area 210 , and the fingerprint detection area 210 further includes a first light-emitting area 211 and a second light-emitting area Area 212, wherein the light emitted by the light-emitting display pixels in the first light-emitting area does not include the first color light component, and the light emitted by the light-emitting display pixels in the second light-emitting area includes the first color light component. The first light emitting area 211 and the second light emitting area 212 do not overlap.

It should be understood that the light splitting amount of the first color in the embodiment of the present application may be any one of the following colors: pure red, pure blue, and pure green.

For ease of understanding, in the following description of the fingerprint identification device of the embodiment of the present application, the first color light component is the red light component as an example, but the embodiment of the present application is not limited thereto.

Using the principle that all colors of light are composed of RGB (red, green, blue), and the white light source is a light source of R/G/B three-color composite light, which corresponds to the first color light component in the embodiment of the present application When it is a red light component, the light emitted by the light-emitting display pixels in the first light-emitting area 211 may be G/B composite light, that is, cyan light, while the light emitted by the light-emitting display pixels in the second light-emitting area 212 may be white light, However, the embodiments of the present application do not limit this.

It should be understood that a fingerprint identification device 300 is provided below the display screen 200 of the electronic device 20 in the embodiment of the present application, and the fingerprint identification device 300 can be used to receive the light signal returned by the finger.

Specifically, the fingerprint identification device 300 may include: an optical sensor, an optical path guiding structure, and at least one first filter unit, wherein the optical sensor includes a first sensing area corresponding to the first light-emitting area 211 , and the optical path guides The structure is arranged above the optical sensor, and the at least one first filter unit is arranged above the at least one first pixel unit in the first sensing area, wherein each first filter unit corresponds to one first pixel unit.

It should be understood that the first light-emitting area 211 in the embodiment of the present application corresponds to the first sensing area, and it can be understood that the first sensing area can receive the reflected light signal returned by the first light-emitting area, but cannot receive the reflected light signal returned by the second light-emitting area. Reflected light signal; Correspondingly, the fact that the second light-emitting area corresponds to the second sensing area can be understood that the second sensing area can receive the reflected light signal returned by the second light-emitting area, but cannot receive the reflection returned by the first light-emitting area Optical signal, which is not limited in this application.

Specifically, the light path guiding structure is used to guide the first light signal in the first return light signal to the first sensing area, and the first return light signal includes the light emitted by the light-emitting display pixels in the first light-emitting area 211 to illuminate the finger The reflected light signal and the transmitted light signal returned afterward, and the transmitted light signal returned after the finger is irradiated with light emitted by the light-emitting display pixels in the second light-emitting area 212 .

That is to say, the first sensing area cannot receive the reflected light signal returned by the light emitted by the light-emitting display pixels in the second light-emitting area 212 after irradiating the finger. The light does not have the first color light component (here can be the red light component), so the reflected light signal and the transmitted light signal returned after the light emitted by the light-emitting display pixels in the first light-emitting area 211 irradiates the finger do not have the red light component , and the light emitted by the light-emitting display pixels in the second light-emitting area 212 includes red light components. Therefore, the transmitted light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area 212 illuminates the finger includes red light components.

Further, the at least one first filter unit is used for passing only the first color light component, and the first light signal received by the at least one first pixel unit is used for fingerprint anti-counterfeiting authentication.

Specifically, in the first light signal received by the first sensing area, only the transmitted light signal returned after the light emitted from the light-emitting display pixels of the second light-emitting area 212 irradiates the finger includes the red light component. After filtering by the filtering unit, only the red light component can pass through the first filtering unit and enter the optical sensor, and through the transmission principle in the above-mentioned FIGS. Only when the real finger is used to unlock, the first sensing area will receive the red light component and judge the current It is a real finger, and when a fake fingerprint is used for unlocking, since the first sensing area cannot receive the red light component, it is judged as a fake fingerprint, thereby realizing anti-counterfeiting authentication.

For ease of understanding, the content of the above embodiments will be described below by taking the fingerprint identification device 300 as the fingerprint identification device 300 in the lens system as an example. FIG. 8 shows an electronic device equipped with the fingerprint identification device 300 according to the embodiment of the present application. A schematic diagram of the device 20 .

It should be understood that since the functions of the various components in the embodiments of the present application are the same in the embodiments of the present application, the same reference numerals are used for the same parts in the following description.

As shown in FIG. 8 , the electronic device 20 includes a display screen 200, wherein the display screen 200 has a first light-emitting area 211 and a second light-emitting area 212, and these light-emitting areas may also be called light spots on the display screen, wherein the first light-emitting area The area 211 may be a middle area shown in the display screen, and the light emitted by the light-emitting display pixels does not include red light components, and the second light-emitting area 212 may be an edge area except the middle area, and the light emitted by the light-emitting display pixels includes red light. weight.

The electronic device 20 further includes a fingerprint identification device 300 , wherein the fingerprint identification device 300 includes an optical sensor 310 , an optical path guide structure 320 and at least one red color filter 330 . The optical sensor 310 includes a first sensing area 311 (ie, a middle area) and a second sensing area 312, wherein the first sensing area 311 includes at least one first pixel unit and at least one first filter unit. arranged above at least one first pixel unit.

Optionally, the optical path guiding structure 320 in the embodiment of the present application may be specifically an opening of a bracket in the lens system, but the present application is not limited thereto.

It can be seen from FIG. 8 that the reflected light signal and the transmitted light signal returned after the light emitted by the light-emitting display pixels in the first light-emitting area 211 of the display screen 200 irradiates the finger, and the light-emitting display pixels in the second light-emitting area 212 emit light. The transmitted light signal returned after the light irradiates the finger 140 can enter the first sensing area 311 in FIG. 8, while the reflected light signal returned after the light emitted by the light-emitting display pixels in the second light emitting area 212 irradiates the finger 140 cannot enter the first sensing area 311. In a sensing area 311, since the reflected light signal and the transmitted light signal corresponding to the first light-emitting area 211 have no red light component, the transmitted light signal corresponding to the second light-emitting area 212 has a red light component. After the red filter 330 above the first pixel unit in a sensing area, it can enter the first pixel unit and be received by the first pixel unit. Therefore, when the real finger 140 is used for fingerprint recognition, the first sensing area 311 can receive the red light component.

On the contrary, FIG. 9 shows a schematic diagram of fingerprint identification using the 2D fake fingerprint 150 when the same electronic device 20 as in FIG. 8 is used. As shown in FIG. 9 , since the 2D fake fingerprint will not transmit and return transmitted light after being irradiated by light, therefore, the first sensing area 311 in FIG. The reflected light signal and the transmitted light signal returned after the light emitted by the light-emitting display pixel irradiates the finger, but the transmitted light signal corresponding to the light emitted by the light-emitting display pixel in the second light-emitting area 212 and returned after the finger is irradiated cannot be received. The light emitted by the light-emitting display pixels in the light-emitting area 211 does not have a red light component. Therefore, after being filtered by the red filter 330 above the optical sensor 310, when the 2D fake fingerprint 150 is used, the first sensing area 311 receives No optical signal.

To sum up, according to the aforementioned principle that the real finger forms the transmitted light, the anti-counterfeiting authentication of the real finger 140 and the fake 2D fingerprint 150 can be performed.

Further, the fingerprint identification device 300 in the embodiment of the present application can realize the fingerprint identification function while realizing the above-mentioned anti-counterfeiting authentication.

Specifically, the fingerprint identification device 300 shown in FIG. 8 and FIG. 9 is taken as an example below, but the present application is not limited thereto.

As shown in FIG. 8 , the fingerprint identification device 300 further includes a second sensing area 312, which may correspond to the second light-emitting area 212, and may correspond to the edge area of the display screen in FIG. The second sensing area 312 may include a plurality of second pixel units.

The light path guiding structure 330 is also used for: guiding the second light signal in the second return light signal to the second sensing area 312 , and the second return light signal may be the light emitted by the light-emitting display pixels in the first light-emitting area 211 The transmitted light signal returned after the finger is irradiated, and the reflected light signal and the transmitted light signal returned after the finger is irradiated by the light emitted by the light-emitting display pixels in the second light-emitting area 212 .

That is to say, the second sensing area 312 cannot receive the reflected light signal returned after the finger is irradiated with light emitted from the light-emitting display pixels in the first light-emitting area 211 .

In the embodiment of the present application, the dotted line in the figure may represent the transmitted light signal, and the solid line may represent the reflected light signal. It should be understood that the embodiment of the present application only illustrates part of the returned light signal, and the present application does not limited to this.

Further, the second light signal received by the second pixel unit is used for fingerprint identification of the finger.

Specifically, the second sensing area 312 can use the received second optical signal to identify the fingerprint, and the specific identification process can refer to the prior art, which will not be described in detail in this embodiment of the present application.

As an embodiment, it is described above that the at least one first pixel unit included in the first sensing area 311 may be: all pixel units in the first sensing area 311 are first pixel units, which can achieve better Anti-counterfeiting certification.

However, if all the pixel units in the first sensing area 311 are the first pixel units, the final fingerprint recognition may be affected due to the lack of some fingerprint information therein.

As another embodiment, the first sensing area 311 may further include a plurality of third pixel units, and no red filter unit is disposed above the plurality of third pixel units, so that the third pixel units can receive the first light Therefore, the same as the second pixel unit in the second sensing area 312, the first optical signal received by the third pixel unit and the second optical signal received by the second pixel unit can be used together It is used for fingerprint recognition, so that the performance of fingerprint recognition is guaranteed while anti-counterfeiting authentication is realized.

In order to prevent the first sensing area 311 in the embodiment of the present application from receiving the reflected light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area 212 is irradiated to the finger, corresponding to the electronic signal in FIG. 8 and FIG. 9 The device 20 may define the optical path guiding structure 330 therein.

Specifically, the light path guiding structure 330 may include: a light-passing hole, and the light-passing hole can make the reflected light signal returned after the light emitted by the light-emitting display pixels in the first light-emitting area 211 irradiates the finger to pass through the light-passing small hole. The hole reaches the optical sensor 310 , so that the reflected light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area 212 is irradiated to the finger cannot reach the optical sensor 310 through the light-transmitting hole.

Specifically, taking the light-transmitting hole in the embodiment of the present application as the opening 331 on the light-shielding layer (or, also called the diaphragm) installed inside the bracket 332 as an example, it can be known from the principle of hole imaging that the first sense of The range of the light signal received by the detection area 311 is related to the angle of the first light-emitting area 211, the opening 331 and the return light that the optical sensor 310 can receive. In order to limit the light emitted by the light-emitting display pixels in the second light-emitting area 212 The reflected light signal returned after being irradiated to the finger cannot pass through the light-transmitting hole 313 , and the diameter of the opening 331 in the embodiment of the present application can be set to be 0.1 mm˜0.5 mm. Correspondingly, the diameter of the first light-emitting region 211 can be set to 1 mm ~10mm, the angle range of the return light signal received by the optical sensor 310 is 20 degrees to 75 degrees. The cooperation of the three can ensure that the first sensing area 311 cannot receive the light emitted by the light-emitting display pixels in the second light-emitting area 212. The reflected light signal that returns after light hits the finger.

Alternatively, as an implementation manner, the light-passing hole can also be an opening on the light-shielding layer (or, it can also be called a diaphragm) inside the lens, and the lens barrel can be installed on a bracket. For details, please refer to the prior art , which is not repeated in this embodiment of the present application.

In order to achieve better anti-counterfeiting authentication, the diameter of the first sensing area 311 in the embodiment of the present application may be greater than 30um.

As an example, the fingerprint identification device 300 in this embodiment of the present application may further include a lens, which may correspond to the lens 340 in FIG. 8 and FIG. 9 , and is disposed below the light-transmitting hole, used to transmit the light signal passing through the hole. Image to optical sensor 310 .

8 and 9 above, when describing the fingerprint identification device in the embodiment of the present application, the first light-emitting area 211 is located in the central area of the fingerprint detection area as an example for description. Optionally, the embodiment of the present application is described. The first light-emitting area 211 may also be located in the edge area of the fingerprint detection area, and correspondingly, the second light-emitting area 212 is located in the central area of the fingerprint detection area.

The fingerprint identification device of the embodiment of the present application is described below by taking an example that the first light-emitting area 211 in the embodiment of the present application is located at the edge area of the fingerprint detection area. FIG. 10 shows another schematic diagram of fingerprint detection using a real finger according to an embodiment of the present application.

As shown in FIG. 10 , the difference from FIG. 8 and FIG. 9 is that the first light-emitting area 211 in the embodiment of the present application is located in the edge area of the fingerprint detection area, and the second light-emitting area 212 is located in the center area of the fingerprint detection area. The structure is the same as that in FIG. 8 and FIG. 9 , and will not be repeated here.

In order to realize the difference in transmitted light of the first light-emitting region 211 in the edge region, the diameter of the opening 331 in the embodiment of the present application may also be set to be 0.1 mm˜0.5 mm. Correspondingly, the second light-emitting region 212 , that is, the middle region has The diameter of the white light region of the red light component is larger than 2.5 mm, and the diameter of the second sensing region corresponding to the second light emitting region 212 is smaller than 930 μm.

Specifically, when a real finger touches the fingerprint detection area to trigger fingerprint detection, the first light-emitting area 211 and the second light-emitting area 212 emit light at the same time. The reflected light with the red light component is limited by the size of the opening 331 and the size of the above-mentioned area, so the first sensing area 211 cannot receive the reflected light signal returned after the light from the second light-emitting area 212 illuminates the finger, At the same time, the light with the red light component in the second light-emitting area 212 will be refracted into the finger and spread out in the finger. At this time, the finger can be used as a light source, and the transmitted light scattered by the finger can enter the first sensing area 311. That is, the first sensing region 311 can receive the red transmitted light with a large angle.

On the other hand, FIG. 11 shows another schematic diagram of fingerprint detection using a fake 2D fingerprint according to an embodiment of the present application. As shown in FIG. 11 , since the 2D fake fingerprint 150 will only be reflected but not refracted when irradiated by light, the first sensing area 211 is limited by the size of the above-mentioned opening, light-emitting area and detection area, and cannot be The reflected light signal with the red light component is received, while the 2D fake fingerprint does not emit transmitted light. Therefore, the first sensing area 211 in FIG. 11 cannot receive the light signal. The transmitted light signal of the red light component can be used for anti-counterfeiting authentication.

In the above description of the fingerprint identification device in the embodiment of the present application, the fingerprint identification device in the lens system structure is used as an example for description. In the fingerprint identification device with the structure, different from the lens system structure above, the optical path guiding structure in the fingerprint identification device with the structure as shown in FIG. 3 may include an array of small holes. Specifically, FIG. Another schematic diagram of an electronic device equipped with a fingerprint recognition device.

As shown in FIG. 12 , different from the structure of the lens system in FIGS. 8 to 11 , the optical path guiding structure in the lens system has only one through hole, while the optical path guiding structure in the embodiment of the present application may include an array of small holes, specifically , the optical path guiding structure may include a microlens array; at least one light blocking layer is arranged below the microlens array, and each light blocking layer in the at least one light blocking layer is provided with a small hole array; the microlens array and the small hole array A plurality of light guide channels are formed in one-to-one correspondence with the pixel units of the optical sensor, and the light guide channels are used to guide the first light signal and/or the second light signal to the corresponding pixel units.

It should be understood that in the optical path guiding structure in FIG. 12 , the first optical signal and/or the second optical signal guided by the above-mentioned light guiding channel may have a specific direction, for example, the first optical signal and the second optical signal pass through the light blocking The directions of the light guide channels formed by the layers and the microlens array may all be vertical directions, or may all be inclined directions of the same angle, or may also include multiple light guide channels in different directions, which can be determined according to actual needs. set, which is not limited in this embodiment of the present application.

For the above structure, reference may be made to related structures in the prior art, which is not limited in this application.

The improvement of the optical path structure in the embodiments of the present application mainly focuses on the definition of the small hole array. Therefore, the following embodiments only describe the content related to the small hole array, but the present application does not limit this.

As shown in FIG. 12 , the above-mentioned pinhole array may refer to the grating 332 including a plurality of pinholes in FIG. 12 , or may be in other forms, which are not limited in this application.

It should be understood that in this application, in order to more clearly show the reflected light and the transmitted light in the middle region of the grating, part of the grating 332 is not drawn, but it should be understood that the gratings 322 in this embodiment of the present application may be arranged at equal distances.

First, the first light-emitting area 211 is located in the central area of the fingerprint detection area as an example for description. As shown in FIG. 12 , the central area of the screen does not have the first light-emitting area 211 with the red light component, and the edge area has the red light component (which can be The second light-emitting area 212 of white light), correspondingly, the area corresponding to the first light-emitting area 211 in the center of the optical sensor 310 is the first sensing area 311, and the area at the edge of the optical sensor 310 corresponding to the second light-emitting area 212 is the first light-emitting area 212. The two sensing regions 312 , and the optical path guiding structure 320 in the middle includes a plurality of small holes 3321 formed by the grating 332 .

In order to ensure that the first sensing area 311 can only receive the transmitted light after the light from the second light emitting area 212 irradiates the finger, the diameter of the small hole 3321 on the grating in the embodiment of the present application can be set to 12.5um-50um, correspondingly Yes, the optical sensor 310 can only receive light at a fixed angle, the diameter of the first light emitting area 211 in the middle is greater than 200um, and the diameter of the first sensing area 311 is greater than 200um.

When a real finger touches the fingerprint detection area of the display screen 200, the first light-emitting area 211 and the second light-emitting area 212 emit light at the same time, and the reflected light with red light component after the white light of the second light-emitting area 212 illuminates the finger cannot enter the first sensor After the white light from the second light-emitting area 212 illuminates the finger, it will be refracted into the finger and spread out in the finger. The transmitted light scattered by the finger can enter the first sensing area 311 through the small hole 3321, that is, the first sensing area 311. The detection area 311 can receive red transmitted light with a small angle.

On the other hand, FIG. 13 shows another schematic diagram of fingerprint detection using a fake 2D fingerprint according to an embodiment of the present application. As shown in FIG. 13 , based on the above-mentioned similar analysis, when the fake 2D fingerprint is used for fingerprint detection, the first sensing area 311 cannot receive the light signal with the red light component. Therefore, based on the difference between the transmitted light of the real and fake fingers , the fingerprint identification device can realize anti-counterfeiting authentication.

Similarly, the first light-emitting area 211 in FIGS. 12 and 13 may also be located at the edge area of the fingerprint detection area, as shown in FIGS. 14 and 15 , that is, the middle area is the second light-emitting area 212 with red light components , the edge area is the first light-emitting area 211 without the red light component. At this time, the diameter of the small hole 3321 on the grating can be set to be 12.5um to 50um. Correspondingly, the optical sensor 310 can only receive light of a fixed angle, and the middle The diameter of the second light-emitting region 212 is less than 200um, and the diameter of the second sensing region 311 is less than 200um. For details, reference may be made to the foregoing description, which will not be repeated here.

For similar reasons as described above, the first sensing area 311 at the edge can only receive the transmitted light from the second light emitting area 212 after the finger is irradiated. Due to the difference in transmitted light between real and fake fingers, anti-counterfeiting authentication can be achieved.

In addition, in the ultra-thin structure as shown in FIG. 3 and FIG. 12 to FIG. 15 , because in this structure, the through holes in the optical path guiding structure can be in the form of an array of small holes, instead of the lens system including only one The structure of the light-passing hole, in the structures shown in Figures 12 to 15, the uneven spot area including the first light-emitting area 211 and the second light-emitting area 212 can be placed at any position in the fingerprint detection area, as shown in Figure 16. The schematic diagrams of several non-uniform light spots in the embodiments of the present application can be realized as long as the colors of the light emitted by the first light-emitting area 211 and the second light-emitting area 212 are different. It should be understood that FIG. 16 only shows an example Several distribution representations are given, but this application does not limit it.

It should be understood that the fingerprint identification devices of the above two structures have the same settings except for the optical path guiding structure, which will not be repeated in this embodiment of the present application.

As an embodiment, the fingerprint identification devices of the above two structures may further include a plurality of second filter units, and the second filter units are arranged above the foregoing plurality of second pixel units and/or a plurality of third pixel units , wherein each second filter unit corresponds to a second pixel unit or a third pixel unit, and at least one second filter unit is used to prevent the light component of the first color from passing through. Specifically, corresponding to the first color light component in the embodiment of the present application is the red light component, as shown in FIGS. 8 and 9 , the second filter unit may be a green filter 350 , and the green filter 350 may Used to block the red light component from passing through.

By setting the second filter unit, the background color can be set for the pixel units in the entire optical sensor 310, and the second filter unit can be used to filter out the green light component in the first filter unit, and the anti-counterfeiting authentication can be corrected. Or alternatively, a second filter unit may also be provided in the first sensing area, which may be used to filter out the green light component, and may also play a role in correcting the anti-counterfeiting authentication.

Alternatively, the filter unit may not be provided above the second pixel unit and/or the third pixel unit in the embodiment of the present application, but a transparent layer may be provided, which is not limited in the embodiment of the present application.

It should be understood that, in order to facilitate the representation of the red color filter 330 and the green color filter 350, the two color filters in FIG. 8 to FIG. 13 respectively cover the first sensing area 311 and the second sensing area 312, but should be It is understood that the filters in the embodiments of the present application correspond to the pixel units one-to-one, and they may be continuous and separate, or may be discretely distributed, which is not limited in the embodiments of the present application.

FIG. 17 shows a distribution diagram of the first filter unit in the embodiment of the present application, and the distribution is separated by two pixel units in the horizontal and vertical directions, or a cross-shaped distribution can also be used.

The first filter units in the embodiments of the present application may be arranged according to actual conditions, which are not limited in the embodiments of the present application.

As an embodiment, in order to ensure that the fingerprint identification device of the embodiment of the present application can achieve anti-counterfeiting authentication and also ensure good fingerprint identification performance, the number of at least one first filter unit and the first sensing area 311 can be set to include: The proportion of the total number of pixel units is less than the first threshold.

For example, the first threshold may be 5%.

As an embodiment, a plurality of first filter units may be disposed above the plurality of second pixel units in a circle of the second sensing area 311 around the first sensing area 312 in the embodiment of the present application, The plurality of first filter units are in one-to-one correspondence with the plurality of second pixel units.

It should be understood that the range of the returned light signal entering the first sensing area 311 in the embodiment of the present application may be a circle, and the pixel unit may be a square. In this case, some pixels in the first sensing area 311 may be caused. The light signal received by the unit may also come from the reflected light signal in the second light-emitting area 212 , so that it is not easy to distinguish the pixel unit that only receives the first light signal. The addition of the first filter unit to the pixel unit can make the second pixel unit that receives the second optical signal contrast with the first pixel unit that receives the first optical signal, so as to better perform anti-counterfeiting authentication.

As an embodiment, in order to reduce the influence of infrared light in ambient light, the fingerprint identification device in this embodiment of the present application may further include an infrared cut-off filter layer. As shown in FIGS. 8 to 15 , the infrared cut-off filter layer 360 It is arranged above the optical sensor 310 and is used to filter out infrared light in ambient light. It should be understood that the infrared cut filter layer can filter out most of the infrared light in the ambient light, and can also filter out most of the red light.

Wherein, corresponding to the case where the first color light component is the red light component in the embodiment of the present application, the infrared cut filter layer 360 can also filter out most of the red light components in the first light signal and the second light signal, Therefore, the data acquired by the optical sensor 310 has only a small difference in red light, which can reduce the influence on fingerprint recognition.

As an example, in order to reduce the influence of the difference in color light components on fingerprint recognition, the color of the light emitted in the direction of the second light-emitting area 212 toward the first light-emitting area 211 may be set as a gradient color. When the first light-emitting area 211 is cyan light, and the second light-emitting area 212 is white light, the color of the light emitted by the second light-emitting area 212 can be set to gradually change from white light to cyan light, and gradually transition to the cyan light of the first light-emitting area 211. Reduce the impact on fingerprint recognition.

As an example, the area of the second light-emitting region 212 in the embodiment of the present application may be larger than that of the first light-emitting region 211 , which can ensure good fingerprint recognition performance while realizing anti-counterfeiting authentication. Optionally, the area of the first light-emitting region 211 in the embodiment of the present application is smaller than the field of view area of the optical sensor 310 .

Optionally, in the embodiment of the present application, the first light-emitting area 211 is symmetrically distributed with respect to the center point of the fingerprint detection area.

Optionally, the first light-emitting area 11 in the embodiment of the present application may be a square or a circle, which is not limited in the embodiment of the present application.

The above description is based on the fact that the first color light component in the embodiments of the present application is red. When the first color light component is red, correspondingly, the first filter unit is a red filter unit, and the second filter unit is a red filter unit. It can be a green filter unit. Optionally, the first color light component in the embodiment of the present application can also be other colors, as long as it cooperates with the color of the corresponding first filter unit, the light component in the embodiment of the present application can be realized. Fingerprint anti-counterfeiting authentication and fingerprint recognition.

For example, the first light-emitting area 211 may not include the blue light component, the first filter unit only passes the blue or purple light component, and cooperates with the second filter unit to pass the green or yellow light component; or, the first light-emitting area may also pass the light. 211 does not include the red component, the first filter unit only passes the red light component, and cooperates with the second filter unit to pass only the green and yellow light; or, the first light-emitting area 211 only has the green light component, and the first filter unit Only pass the red light component, and cooperate with the second filter unit to pass the green light component; or the first light-emitting area 211 does not include the green light component, the first filter unit only passes the green or yellow light component, and cooperates with the second filter unit to pass For blue or violet light, the above only exemplifies several possible implementations, but the embodiments of the present application are not limited thereto.

As an embodiment, the fingerprint identification device in the embodiment of the present application further includes a processor configured to determine whether the finger is a real finger according to the light intensity of the first light signal received by the at least one first pixel unit.

Specifically, if the light intensity of the first optical signal received by the at least one first pixel unit is greater than or equal to a preset value, the processor is configured to determine that the finger is a real finger; The light intensity of the first light signal received by a pixel unit is less than the preset value, and the processor is configured to determine that the finger is a fake finger.

FIG. 18 shows a schematic flowchart of a fingerprint anti-counterfeiting method 1800 according to an embodiment of the present application. It should be understood that the method 1800 may be performed by an electronic device having a display screen, for example, the electronic device may be the above-mentioned

electronic device

10 or 20, for example, the

electronic device

10 or 20 may include a processor or a processing unit; The fingerprint identification device 300 may include a processor or processing unit for performing the method 1800 .

As shown in Figure 18, the method 1800 includes:

S1810: Acquire a first light signal of a finger touching a fingerprint detection area of the display screen, where the fingerprint detection area includes a first light-emitting area and a second light-emitting area, wherein the light emitted by the light-emitting display pixels in the first light-emitting area does not include The first color light component, the light emitted by the light-emitting display pixels in the second light-emitting area includes the first color light component, the fingerprint identification device includes an optical sensor, an optical path guiding structure and at least one filter unit, and the first light signal is the first color light component. In the returned light signal, the light signal is guided to the optical sensor through the light path guiding structure, and the first returned light signal includes the reflected light signal and the transmitted light returned after the light emitted by the light-emitting display pixels in the first light-emitting area irradiates the finger. The optical sensor includes a first sensing area corresponding to the first light-emitting area, and a transmitted light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area irradiates the finger.

S1820, perform fingerprint anti-counterfeiting authentication on the finger according to the first optical signal received in the first sensing area.

Optionally, as an embodiment, according to the first optical signal received by the first sensing area, performing fingerprint anti-counterfeiting authentication on the finger includes: if the at least one first pixel unit receives the first The light intensity of the light signal is greater than or equal to a preset value, and the processor is configured to determine that the finger is a real finger; if the light intensity of the first light signal received by the at least one first pixel unit is less than the preset value Set value, the processor is used to determine that the finger is a fake finger.

Optionally, as an embodiment, the optical sensor includes a second sensing area corresponding to the second light-emitting area, and the method 1800 further includes: according to the second light signal received by the second sensing area, performing the Fingerprint identification is performed on a finger, wherein the second light signal is a transmitted light signal returned after the light emitted by the light-emitting display pixels in the first light-emitting area irradiates the finger, and the light-emitting display pixels in the second light-emitting area are emitted. The reflected light signal and the transmitted light signal returned after light irradiates the finger.

Optionally, as an embodiment, the first sensing area in the optical sensor further includes a plurality of third pixel units, and the method 1800 further includes: a second optical signal received according to the second sensing area, and The first optical signal received by the third pixel unit in the first sensing area performs fingerprint recognition on the finger.

The fingerprint anti-counterfeiting method according to the embodiment of the present application can form the difference of transmitted light through the light-emitting areas of different colors, and then perform anti-counterfeiting authentication in combination with the data received by the pixel unit with the first filter unit, and use the fingerprint without the first filter unit. The data received by the pixel unit is used for fingerprint identification, so that the dual functions of fingerprint anti-counterfeiting authentication and fingerprint identification can be realized at the same time, the complexity of anti-counterfeiting authentication is reduced, and the speed of fingerprint unlocking is correspondingly improved.

FIG. 19 shows a schematic flowchart of fingerprint unlocking and anti-counterfeiting authentication according to an embodiment of the present application. As shown in Figure 19:

S1901, identification starts.

S1902, detecting whether there is a finger touch.

If there is a finger touch, go to step S1903, if not, go to S1902.

S1903, the uneven light spots are bright. It may be the first light-emitting region and the second light-emitting region in the embodiments of the present application.

S1904, collect data of the optical sensor.

S1905, fingerprint identification is performed using data collected by the pixel unit without a color filter.

It should be understood that the pixel units without color filters described herein may refer to pixel units other than the aforementioned first pixel unit, such as the aforementioned second pixel unit and third pixel unit.

S1906, confirm whether the fingerprints are successfully matched, if the matching is successful, go to step S1906, if not, go to S1902. For the fingerprint identification process, reference may be made to the prior art, which is not described in detail in this embodiment of the present application.

S1907, using the data collected by the pixel unit with the color filter to calculate the transmitted light.

It should be understood that the pixel unit with a color filter here may refer to the aforementioned first pixel unit with the first filter unit. The specific calculation of the transmitted light may be calculated by calculating the light intensity of the received optical signal, which is not described in detail in this embodiment of the present application.

S1908, judge whether the finger is true or false according to the calculation result, if so, go to S1909, otherwise, go to S19010.

S1909, the identification is successful, and the process proceeds to step S1911 to end this identification.

In S19010, the identification fails, and the process proceeds to S1911 to end the identification.

The difference in transmitted light formed by the uneven light spots in the embodiments of the present application is calculated in combination with the data of the pixel unit with a color filter, so that anti-counterfeiting authentication can be realized. Fingerprint identification, so that the functions of fingerprint identification and anti-counterfeiting authentication can be realized at the same time. Compared with the prior art, the anti-counterfeiting authentication scheme of the embodiment of the present application has lower complexity, and the corresponding fingerprint unlocking time is shorter.

It should be understood that the method 1800 in this embodiment of the present application may be executed by a processing unit or a processor in an electronic device. Specifically, FIG. 20 shows a schematic block diagram of an electronic device 2000 according to an embodiment of the present application. As shown in FIG. 20 , the electronic device 2000 includes a display screen 2010 , a fingerprint identification device 2020 and a processing unit 2030 . Wherein, the display screen 2010 may correspond to the display screen in the electronic device in FIG. 8 to FIG. 15 , and is suitable for the relevant description of the display screen; the fingerprint identification device 2020 may correspond to the fingerprint identification in the electronic device in FIG. 8 to FIG. 15 . The device is applicable to the relevant description of the fingerprint identification device, and is not repeated here for brevity. In addition, the processing unit 2030 may be used to execute the method 1500 of this embodiment of the present application, and the processing unit 2030 may be a processing unit or processor located in the electronic device 2000, or the processing unit 2030 may also be located in the fingerprint identification device 2020 The processing unit or processor is not limited to this embodiment of the present application.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in the present application. Modifications or substitutions shall be covered by the protection scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A fingerprint identification device, characterized in that it is arranged below a display screen of an electronic device, the display screen includes a fingerprint detection area, and the fingerprint detection area includes a first light-emitting area and a second light-emitting area, wherein the first light-emitting area The light emitted by the light-emitting display pixels in the light-emitting area does not include the first color light component, and the light emitted by the light-emitting display pixels in the second light-emitting area includes the first color light component,

The fingerprint identification device includes:

an optical sensor, the optical sensor including a first sensing area corresponding to the first light emitting area;

an optical path guiding structure, arranged above the optical sensor, for guiding the first optical signal in the first return optical signal to the first sensing area, and the first return optical signal includes the first light emission The reflected light signal and the transmitted light signal returned after the light emitted by the light-emitting display pixels in the area irradiates the finger, and the transmitted light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area irradiates the finger;

At least one first filter unit is disposed above at least one first pixel unit in the first sensing area, wherein each first filter unit corresponds to one first pixel unit, and the at least one first filter unit corresponds to one first pixel unit. The filter unit is used for passing only the first color light component, and the first light signal received by the at least one first pixel unit is used for fingerprint anti-counterfeiting authentication.
The fingerprint identification device according to claim 1, wherein the optical sensor further comprises a second sensing area corresponding to the second light-emitting area, the second sensing area comprising a plurality of second pixel units ;

The optical path guiding structure is also used for:

The second light signal in the second return light signal is guided to the second sensing area, and the second return light signal is the transmission returned after the light emitted by the light-emitting display pixels in the first light-emitting area irradiates the finger the light signal, and the reflected light signal and the transmitted light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area irradiates the finger;

The second optical signal received by the second pixel unit is used for fingerprint identification of the finger.
The fingerprint identification device according to claim 2, wherein the first sensing area further comprises a plurality of third pixel units, and the first optical signal and the second light signal received by the third pixel units The second optical signal received by the pixel unit is used for fingerprint identification of the finger.
The fingerprint identification device according to claim 3, wherein the optical path guiding structure comprises:

A light-passing hole, the light-passing hole makes the reflected light signal returned after the light emitted by the light-emitting display pixels in the first light-emitting area irradiates the finger to reach the optical sensor through the light-passing hole, and makes the light pass through the small hole. The reflected light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area is irradiated to the finger cannot pass through the light-transmitting hole to reach the optical sensor.
The fingerprint identification device according to claim 4, wherein the optical path guiding structure further comprises:

The lens is disposed under the light-passing hole, and is used for imaging the optical signal passing through the light-passing hole to the optical sensor.
The fingerprint identification device according to claim 3, wherein the optical path guiding structure comprises:

microlens array;

At least one light-blocking layer is disposed below the microlens array, and each light-blocking layer in the at least one light-blocking layer is provided with an array of small holes;

The microlens array and the pinhole array form a plurality of light guide channels corresponding to the pixel units of the optical sensor one-to-one, and the light guide channels are used to transmit the first light signal and/or the second light The signals are directed to the corresponding pixel cells.
The fingerprint identification device according to claim 4 or 5, wherein the diameter of the light-transmitting small hole is 0.1 mm˜0.5 mm.
The fingerprint identification device according to claim 7, wherein the diameter of the first light-emitting area is 1 mm˜10 mm.
The fingerprint identification device according to claim 7 or 8, wherein the angle of the returned light signal received by the optical sensor ranges from 20 degrees to 75 degrees.
The fingerprint identification device according to any one of claims 7-9, wherein the diameter of the first sensing area is greater than 30um.
The fingerprint identification device according to claim 6, wherein the diameter of each small hole in the small hole array is 12.5um-50um.
The fingerprint identification device according to claim 11, wherein the radius of the first light-emitting area is greater than 100um.
The fingerprint identification device according to claim 11 or 12, wherein the radius of the first sensing area is greater than 100um.
The fingerprint identification device according to any one of claims 4-13, wherein the first light-emitting area is located in a central area of the fingerprint detection area.
The fingerprint identification device according to claim 4 or 5, wherein the diameter of the second light-emitting area is greater than 2.5 mm.
The fingerprint identification device according to claim 15, wherein the diameter of the second sensing area is less than 930um.
The fingerprint identification device according to claim 6 or 11, wherein the diameter of the second light-emitting region is less than 100um.
The fingerprint identification device according to claim 17, wherein the radius of the second sensing area is less than 100um.
The fingerprint identification device according to any one of claims 15-18, wherein the second light-emitting area is located in a central area of the fingerprint detection area.
The fingerprint identification device according to any one of claims 3-19, wherein the fingerprint identification device further comprises:

A plurality of second filter units, arranged above the plurality of second pixel units and/or the plurality of third pixel units, wherein each second filter unit corresponds to a first pixel unit or a third pixel unit A pixel unit, the at least one second filter unit is used for blocking the passing of the first color light component.
The fingerprint identification device according to any one of claims 3-20, wherein a plurality of the second pixel units in the second sensing area surrounds the first sensing area Above, a plurality of the first filter units are disposed, and the plurality of first filter units are in one-to-one correspondence with the plurality of the second pixel units.
The fingerprint identification device according to any one of claims 3-21, wherein the optical path guiding structure further comprises:

The infrared cut-off filter layer is arranged above the optical sensor and is used for filtering out the infrared light in the ambient light.
The fingerprint identification device according to any one of claims 3-22, wherein the ratio of the number of the at least one first filter unit to the total number of pixel units included in the first sensing area less than the first threshold.
The fingerprint identification device according to claim 23, wherein the first threshold is 5%.
The fingerprint identification device according to any one of claims 3-24, wherein the area of the second light-emitting region is larger than that of the first light-emitting region.
The fingerprint identification device according to any one of claims 3-25, wherein the area of the first light-emitting region is smaller than the field of view area of the optical sensor.
The fingerprint identification device according to any one of claims 3-26, wherein the first light-emitting area is symmetrically distributed with respect to the center point of the fingerprint detection area.
The fingerprint identification device according to any one of claims 3-27, wherein the first light-emitting area is a square or a circle.
The fingerprint identification device according to any one of claims 3-28, wherein the first color light component is any one of the following colors: pure red, pure blue, and pure green.
The fingerprint identification device according to any one of claims 3-29, wherein the color of the light emitted by the light-emitting display pixels in the second light-emitting area is a gradient color.
The fingerprint identification device according to any one of claims 3-30, wherein the first filter unit or the second filter unit is a color filter material, and the color filter material includes a red filter material, at least one of a green filter material and a blue filter material.
The fingerprint identification device according to any one of claims 3-31, wherein the first filter unit or the second filter unit is a color filter, and the color filter is a red filter one of a filter, a green filter, and a blue filter.
The fingerprint identification device according to any one of claims 3-32, wherein the fingerprint identification device further comprises:

The processor is configured to determine whether the finger is a real finger according to the light intensity of the first light signal received by the at least one first pixel unit.
The fingerprint identification device according to claim 33, wherein if the light intensity of the first optical signal received by the at least one first pixel unit is greater than or equal to a preset value, the processor is configured to determine the The finger is a real finger;

If the light intensity of the first optical signal received by the at least one first pixel unit is less than the preset value, the processor is configured to determine that the finger is a fake finger.
An electronic device, comprising:

display screen; and

The fingerprint identification device according to any one of claims 1 to 34, wherein the fingerprint identification device is arranged below the display screen, so as to realize optical fingerprint anti-counterfeiting authentication under the screen.