CN111788577B

CN111788577B - Fingerprint identification device, display screen and electronic equipment

Info

Publication number: CN111788577B
Application number: CN202080001552.8A
Authority: CN
Inventors: 宋锐男; 张玮; 王炳文; 王磊; 李顺展
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2024-04-30
Anticipated expiration: 2040-03-03
Also published as: WO2021174423A1; CN111788577A

Abstract

The embodiment of the application relates to a fingerprint identification device, a display screen and electronic equipment, which can realize the reduction of the thickness of the fingerprint identification device while receiving multi-angle optical signals. The display screen comprises from top to bottom: the light-emitting display device comprises a pixel layer where a light-emitting display pixel array is located and a plurality of light blocking layers, wherein each light blocking layer is provided with a through hole array so as to form a plurality of light guide channels in different directions. The fingerprint identification device comprises: the optical sensing pixel array is arranged below the plurality of light blocking layers, each light guiding channel in the plurality of light guiding channels corresponds to one optical sensing pixel, wherein the plurality of light guiding channels are used for transmitting light signals in different directions in return light signals passing through the finger to the plurality of optical sensing pixels in the optical sensing pixel array, each optical sensing pixel is used for receiving the light signals transmitted through the corresponding light guiding channel, and the light signals are used for fingerprint identification of the finger.

Description

Fingerprint identification device, display screen and electronic equipment

Technical Field

The application relates to the field of biological recognition, in particular to a fingerprint recognition device, a display screen and electronic equipment.

Background

The under-screen optical fingerprint system has been implemented in mass production in electronic products such as smart phones. At present, most of the under-screen fingerprint identification principles are that the fingerprint is irradiated by utilizing the spontaneous light of the screen, and reflected light of the finger passes through the screen and is collected and identified by the under-screen photoelectric detection equipment.

In order to improve the identification area of fingerprint signals and receive more fingerprint information, the inside of the under-screen fingerprint device is usually designed with a complex light path, so that multi-angle light can be received, and the under-screen fingerprint device can be used for anti-counterfeiting and other higher-level functions. However, the complex light path can thicken the under-screen fingerprint device, which is not in line with the trend of thinner under-screen fingerprints in the future.

Disclosure of Invention

The application provides a fingerprint identification device, a display screen and electronic equipment, which can realize the reduction of the thickness of the fingerprint identification device while receiving multi-angle optical signals.

In a first aspect, a fingerprint identification apparatus is provided, which is adapted to be applied to a lower portion of a display screen to realize optical fingerprint identification under the screen, and the display screen includes from top to bottom: a pixel layer including a light emitting display pixel array for emitting light and illuminating a finger, each of the plurality of light blocking layers having a through-hole array to form a plurality of light guide channels in different directions, a size of the through-hole array of a first light blocking layer closest to the pixel layer among the plurality of light blocking layers being smallest; the fingerprint recognition device includes: the optical sensing pixel array is arranged below the plurality of light blocking layers, each light guide channel in the plurality of light guide channels corresponds to one optical sensing pixel, wherein the plurality of light guide channels are used for transmitting light signals in different directions in return light signals passing through the finger to the plurality of optical sensing pixels in the optical sensing pixel array, each optical sensing pixel in the optical sensing pixel array is used for receiving the light signals transmitted through the corresponding light guide channel, and the light signals are used for fingerprint identification of the finger.

Therefore, the fingerprint identification device provided by the embodiment of the application is arranged below the display screen, and the plurality of light blocking layers are arranged in the display screen to form light guide channels in different directions, so that light signals in a specific direction are guided to be transmitted to the optical sensing pixel array in the fingerprint identification device below, the optical sensing pixel array can receive the light signals in different directions, the multi-angle light path design in the screen is realized, the light in different directions is received one by one, the high-quality image of the same fingerprint from multiple observation angles can be obtained after the processing, and meanwhile, the thickness of the fingerprint identification device or the photosensitive device can be greatly reduced.

With reference to the first aspect, in an implementation manner of the first aspect, the optical signals in the same direction in the optical signals received by the optical sensing pixel array are used to generate the same fingerprint image, and the optical signals in multiple directions received by the optical sensing pixel array are respectively used to generate multiple fingerprint images.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a difference between at least two fingerprint images in the plurality of fingerprint images is used to perform fingerprint anti-counterfeit authentication of the finger.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the through hole array in the plurality of light blocking layers is used to form a plurality of groups of light guiding channels, one through hole in the first light blocking layer correspondingly forms a group of light guiding channels, and the group of light guiding channels includes at least two light guiding channels with different directions.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, each through hole in the first light blocking layer is used to implement small hole imaging.

In this case, the plurality of light blocking layers arranged in the display screen include one layer of light blocking layer capable of being used for aperture imaging, and further include at least one other light blocking layer, and after imaging by using the aperture imaging principle, the light signals with specific directions can be guided to be transmitted to the optical sensing pixel array in the fingerprint identification device below, so that the optical sensing pixel array can receive the light signals in different directions, and the multi-angle light path design in the screen is realized.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the fingerprint identification device further includes: and the micro lens array is arranged between the plurality of light blocking layers and the optical sensing pixel array and is used for converging the light signals passing through the plurality of light guide channels in different directions to a plurality of optical sensing pixels in the optical sensing pixel array respectively.

In this case, a plurality of light blocking layers are arranged in the display screen to form light guide channels in different directions, so that light signals with specific directions are guided to be transmitted to the micro lens array in the fingerprint identification device below, the micro lens array converges the light signals to the corresponding optical sensing pixel array, that is, imaging is performed through a micro lens imaging principle, the optical sensing pixel array can receive the light signals in different directions, and multi-angle light path design in the screen is realized.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, one light guide channel of the plurality of light guide channels corresponds to one microlens of the microlens array.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, at least two light guide channels intersecting under the plurality of light blocking layers in the plurality of light guide channels correspond to one microlens in the microlens array.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, one set of light guide channels corresponds to one microlens in the microlens array.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the same group of light guide channels are symmetrically distributed with respect to corresponding through holes in the first light blocking layer, and a plurality of optical sensing pixels corresponding to the same group of light guide channels are symmetrically distributed with respect to the corresponding through holes.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, each set of light guide channels includes 4 light guide channels, and the 4 light guide channels correspond to 4 optical sensing pixels in the optical sensing pixel array.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, 4 optical sensing pixels corresponding to the same group of light guide channels are respectively distributed in a square shape.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the 4 optical sensing pixels receive 4 optical signals in directions perpendicular to each other.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, shapes of through holes of a same light blocking layer in the plurality of light blocking layers are the same.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, all through holes in the plurality of light blocking layers are identical in shape and are all circular.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a size of a through hole of a same light blocking layer in the plurality of light blocking layers is the same, and a size of a through hole of each light blocking layer in the plurality of light blocking layers sequentially increases from the first light blocking layer downward.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a diameter of the small hole in the first light blocking layer is less than or equal to 5 μm.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a value range of a diameter of the through hole in the other light blocking layers except the first light blocking layer in the plurality of light blocking layers is 5 μm-10 μm.

In a second aspect, there is provided a display screen comprising: the fingerprint recognition device comprises a pixel layer and a plurality of light blocking layers, wherein the pixel layer comprises a luminous display pixel array, the luminous display pixel array is used for emitting light and irradiating a finger, each light blocking layer in the plurality of light blocking layers is provided with a through hole array so as to form a plurality of light guide channels in different directions, the size of the through hole array of a first light blocking layer nearest to the pixel layer in the plurality of light blocking layers is minimum, the plurality of light guide channels are used for respectively transmitting optical signals in different directions in return optical signals passing through the finger to the fingerprint recognition device, and the optical signals are used for fingerprint recognition of the finger.

Therefore, the display screen of the embodiment of the application is provided with the plurality of light blocking layers to form the light guide channels in different directions, so that the light signals in the specific directions are guided to be transmitted to the corresponding optical sensing pixel arrays in the fingerprint identification device below, the optical sensing pixel arrays can receive the light signals in different directions, the multi-angle light path design in the screen is realized, the light in different directions is received one by one, the high-quality image of the same fingerprint which is complete from a plurality of observation angles can be obtained after the processing, and meanwhile, the thickness of the fingerprint identification device or the photosensitive device can be greatly reduced.

With reference to the second aspect, in an implementation manner of the second aspect, the display screen further includes: and the plurality of inorganic material layers are respectively used for being attached to the upper surface of each light blocking layer of the plurality of light blocking layers and also used for being attached to the lower surface of each light blocking layer.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, the display screen further includes at least one organic material layer, where the at least one organic material layer includes: an organic material layer located between two inorganic material layers between two adjacent light-blocking layers among the plurality of light-blocking layers, and/or an organic material layer located below a light-blocking layer closest to the fingerprint recognition device among the plurality of light-blocking layers.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, the array of through holes in the plurality of light blocking layers is used to form a plurality of groups of light guiding channels, one through hole in the first light blocking layer correspondingly forms a group of light guiding channels, and the group of light guiding channels includes at least two light guiding channels with different directions.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, the same group of light guide channels is symmetrically distributed with respect to corresponding through holes in the first light blocking layer.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, each set of light guide channels includes 4 light guide channels.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, the through holes in each light blocking layer that belong to the same group of light guiding channels are distributed in a square shape.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, directions of the 4 light guide channels are perpendicular to each other.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, shapes of through holes of a same light blocking layer in the plurality of light blocking layers are the same.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, shapes of all through holes in the plurality of light blocking layers are the same.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, a shape of all through holes in the plurality of light blocking layers is a circle.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, a size of a via hole of a same light blocking layer in the plurality of light blocking layers is the same.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, a size of a via hole of each of the plurality of light blocking layers increases from the first light blocking layer downward in sequence.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, a diameter of the aperture in the first light blocking layer is less than or equal to 5 μm.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, a value range of a diameter of the through hole in the other light-blocking layers except the first light-blocking layer in the plurality of light-blocking layers is 5 μm-10 μm.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, the display screen further includes: and the cover plate is positioned above the pixel layer and used for protecting the pixel layer.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, the display screen further includes: and a circuit layer between the pixel layer and the first light blocking layer.

In a third aspect, there is provided an electronic device comprising a fingerprint recognition device as in the first aspect or any possible implementation of the first aspect and a display as in the second aspect or any possible implementation of the second aspect, the fingerprint recognition device being located below the display.

Therefore, the electronic equipment of the embodiment of the application sets the plurality of light blocking layers in the display screen to form the light guide channels in different directions, so that the light signals with the specific directions are guided to be transmitted to the corresponding optical sensing pixel arrays in the fingerprint identification device below, the optical sensing pixel arrays can receive the light signals in different directions, the multi-angle light path design in the screen is realized, the light in different directions is received one by one, the high-quality image of the same fingerprint which is complete from a plurality of observation angles can be obtained after the processing, and meanwhile, the thickness of the fingerprint identification device or the photosensitive device can be greatly reduced.

With reference to the third aspect, in an implementation manner of the third aspect, the processing unit is configured to: generating a plurality of fingerprint images according to the light signals in a plurality of directions received by the optical sensing pixel array; and carrying out fingerprint identification on the finger according to the plurality of fingerprint images.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, the processing unit is configured to: and generating the same fingerprint image by using the same optical signals in the directions in the optical signals received by the optical sensing pixel array.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, the processing unit is further configured to: and determining whether the finger is a true finger according to the difference between at least two fingerprint images in the plurality of fingerprint images.

Drawings

Fig. 1 is a schematic diagram of an under-screen fingerprint recognition module.

Fig. 2 is a side view of an electronic device with an off-screen fingerprint recognition device in accordance with an embodiment of the present application.

Fig. 3 is a schematic diagram of the location of a fingerprint detection area on a display screen according to an embodiment of the present application.

Fig. 4 is a schematic diagram of the principle of pinhole imaging.

Fig. 5 is a schematic diagram of the principles of pinhole imaging in accordance with an embodiment of the present application.

Fig. 6 is a perspective view illustrating a correspondence relationship between one small hole and a plurality of through holes according to an embodiment of the present application.

Fig. 7 is a schematic plan view of correspondence between small holes and a plurality of through holes according to an embodiment of the present application.

Fig. 8 is a side view of a display screen in the electronic device shown in fig. 2.

Fig. 9 is a schematic diagram of fingerprint image processing according to an embodiment of the present application.

Fig. 10 is a side view of another electronic device with an off-screen fingerprint recognition device in accordance with an embodiment of the present application.

Fig. 11 is a schematic diagram of the principle of lens imaging.

Fig. 12 is a schematic diagram of the principle of lens imaging according to an embodiment of the present application.

Fig. 13 is a perspective view illustrating a correspondence relationship among a plurality of light blocking layers, a microlens array, and an optical sensing pixel array according to an embodiment of the present application.

Fig. 14 is a schematic plan view of correspondence between a plurality of light blocking layers according to an embodiment of the present application.

Detailed Description

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

The technical scheme of the embodiment of the application can be applied to various electronic equipment. For example, smart phones, notebook computers, tablet computers, gaming devices, and other portable or mobile computing devices, as well as electronic databases, automobiles, automated teller machines (Automated TELLER MACHINE, ATM), and other electronic devices. However, the embodiment of the present application is not limited thereto.

The technical scheme of the embodiment of the application can be used for the biological characteristic recognition technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, living body recognition, and the like. For ease of explanation, fingerprint recognition techniques are described below as examples.

The technical scheme of the embodiment of the application can be used for the under-screen fingerprint identification technology. The under-screen fingerprint identification technology is characterized in that the fingerprint identification module is arranged below the display screen, so that fingerprint identification operation is carried out in the display area of the display screen, and a fingerprint acquisition area is not required to be arranged in an area except the display area on the front side of the electronic equipment. Specifically, the fingerprint recognition module uses light returned from the top surface of the display assembly of the electronic device for fingerprint sensing and other sensing operations. This returned light carries information about an object (e.g., a finger) in contact with or in proximity to the top surface of the display assembly, and the fingerprint recognition module located below the display assembly performs off-screen fingerprint recognition by capturing and detecting this returned light. The fingerprint recognition module can be designed to realize expected optical imaging by properly configuring optical elements for collecting and detecting returned light, so as to detect fingerprint information of the finger.

In order to improve the identification area of fingerprint signals and receive more fingerprint information, the inside of the under-screen fingerprint device is usually designed with a complex light path, so that multi-angle light can be received, and the under-screen fingerprint device can be used for anti-counterfeiting and other higher-level functions. For example, in order to be able to receive light at multiple angles, an off-screen fingerprint recognition module as shown in fig. 1 may be used, and such a fingerprint recognition module may also be called an on-screen Sensor (Sensor), and the optical path is designed by reasonably designing the lens and the aperture position inside the Sensor.

Specifically, as shown in fig. 1, the fingerprint recognition module is located below the display screen, and the fingerprint recognition module may include a lens layer, where the lens layer includes a plurality of lenses, for example, may include a microlens array. The fingerprint recognition module further includes a plurality of layers of diaphragms, for example, in fig. 1, two layers of diaphragms are taken as an example, namely, a diaphragm 1 and a diaphragm 2, the plurality of layers of diaphragms are located below the lens layer, and the plurality of layers of diaphragms can form a plurality of light guide channels in a plurality of directions so as to receive inclined light signals. An optical path medium, for example, three optical path medium layers as shown in fig. 1, namely optical path medium 1-3, can also be arranged between the multilayer diaphragms, wherein the materials of the different optical path medium layers can be identical or different. In addition, the fingerprint identification module further comprises a photosensitive device under the multilayer diaphragm, and the photosensitive device is used for receiving light signals in multiple directions transmitted through light guide in the multilayer diaphragm, and the light signals in different directions can be used for fingerprint identification.

The external hanging Sensor under the screen as shown in fig. 1 can select the light path incident at the designated angle to be projected onto the photosensitive device by reasonably arranging the lens and the diaphragm, but the lens and the diaphragm under the design occupy most of the space of the Sensor, namely the fingerprint device under the screen is thickened, and the trend that the fingerprint under the screen is thinner is not met.

Therefore, in order to solve the above-mentioned problem, the optical path of the system is shortened, and the embodiment of the application provides various fingerprint identification devices and electronic equipment.

Fig. 2 shows a partial side view of an electronic device 100 according to an embodiment of the application. As shown in fig. 2, the electronic device 100 includes: a display screen 120 and a fingerprint recognition device 130, wherein the fingerprint recognition device 130 is positioned below the display screen 120 to realize off-screen optical fingerprint recognition. In addition, as shown in fig. 2, "110" above the display screen 120 represents an object of fingerprint recognition, for example, when the user performs fingerprint recognition, the finger 110 touches the upper surface of the display screen 120.

It should be understood that the display screen 120 in the embodiment of the present application may be a self-luminous display screen, which employs a display unit having self-luminescence as a display pixel. For example, the display 120 may be an Organic Light-Emitting Diode (OLED) display or a Micro-LED (Micro-LED) display. In other alternative embodiments, the display 120 may be a Liquid crystal display (Liquid CRYSTAL DISPLAY, LCD) or other passive light emitting display, which is not limited in this respect. For ease of illustration, the display 120 is described below as an OLED screen, i.e., as shown in fig. 2, the display 120 includes a pixel layer 121, the pixel layer 121 including an array of light-emitting display pixels for emitting light to display an image, and in addition, the light-emitting display pixels can be used as a light source capable of emitting light and illuminating the finger 110 to generate a return light signal through the finger 110 when fingerprint identification is performed.

Specifically, the fingerprint recognition device 130 may utilize light emitting display pixels (i.e., OLED light sources) of the display screen 120 corresponding to the fingerprint detection area 124 as excitation light sources for optical fingerprint detection. When the finger 110 is pressed against the fingerprint detection area 124, the display 120 emits a beam of light to the target finger 110 above the fingerprint detection area 124, which is reflected at the surface of the finger 110 to form reflected light or scattered through the inside of the finger 110 to form scattered light (transmitted light). For convenience of description, the above reflected light and scattered light are collectively referred to as return light. Since ridges (ridges) and valleys (valleys) of the fingerprint have different light reflection capacities, the returned light from the fingerprint ridges and the returned light from the fingerprint valleys have different light intensities, and the returned light is transmitted and finally received by the optical sensing pixel array in the fingerprint identification device 130 and converted into corresponding electrical signals, i.e., fingerprint detection signals; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, so that an optical fingerprint recognition function is realized in the electronic device 100.

In other alternatives, the fingerprint recognition device 130 may also employ an internal light source or an external light source to provide the light signal for fingerprint detection and recognition. In this case, the fingerprint recognition device 130 may be applied not only to a self-luminous display screen such as an OLED display screen, but also to a non-self-luminous display screen such as a liquid crystal display screen or other passive light-emitting display screen, and the embodiment of the present application is not limited thereto.

Further, the display screen 120 may be specifically a touch display screen, which not only can perform screen display, but also can detect touch or press operation of a user, so as to provide a personal computer interaction interface for the user. For example, in one embodiment, the electronic device 100 may include a Touch sensor, which may be specifically a Touch Panel (TP), which may be disposed on the surface of the display screen 120, or may be partially integrated or integrally integrated into the display screen 120, so as to form the Touch display screen.

It should be understood that the fingerprint recognition device 130 in the embodiment of the present application includes an optical sensing pixel array, where the area where the optical sensing pixel array is located or the sensing area thereof is a sensing area of the fingerprint recognition device 130, which corresponds to a fingerprint detection area (may also be referred to as a fingerprint acquisition area, a fingerprint recognition area, etc.) on the display screen 120. For example, each of the Photo-sensing pixels in the Photo-sensing pixel array may be a Photo-detector, i.e. the Photo-sensing pixel array may specifically be a Photo-detector (Photo detector) array comprising a plurality of Photo-detectors distributed in an array. Wherein the fingerprint recognition device 130 may be disposed in a localized area below the display screen 120.

The fingerprint detection area is located in the display area of the display screen 120, and the sensing area of the corresponding fingerprint recognition device 130 may or may not be located directly under the fingerprint detection area of the display screen 120 according to the different setting of the optical path. In addition, because of the different light path settings, in some embodiments of the present application, the range of the area where the optical sensing pixel array of the fingerprint recognition device 130 is located or the range of the sensing area of the fingerprint recognition device 130 may be equal to or different from the range of the fingerprint detection area on the display screen 120 (or the fingerprint detection area corresponding to the fingerprint recognition device 130), which is not particularly limited in the embodiments of the present application. The area of the sensing area of the fingerprint recognition device 130 may be made larger than the area of the fingerprint detection area on the display screen 120, for example by a reflective folded light path design or other light ray design.

It should be understood that the range of the fingerprint detection area in the display screen 120 according to the embodiment of the present application may be set according to practical applications, and may be set to any size. For example, as shown in FIG. 3, the fingerprint detection area in display 120 of an embodiment of the present application is here labeled 124. Alternatively, as shown in the left diagram of fig. 3, the fingerprint detection area 124 of the display screen 120 may be smaller in area and fixed in position, so that the user needs to press the finger 110 to a specific position of the fingerprint detection area 124 when inputting a fingerprint, otherwise the fingerprint recognition device 130 may not be able to collect a fingerprint image, resulting in poor user experience. In this case, the fingerprint detection area 124 may be generally set to a square with a side length of 2.5 to 3cm so that information of the fingerprint can be sufficiently received, but a specific size may be set according to an actual screen size and mass production conditions.

Alternatively, as shown in the middle or right view of fig. 3, the display screen 120 may be designed as a half-screen fingerprint recognition screen and a full-screen fingerprint recognition screen, that is, the fingerprint detection area 124 may occupy half, most, or all of the display screen 120. For example, the extent of the fingerprint detection area 124 may be increased by providing a fingerprint recognition device comprising a sufficient number of optically sensitive pixels. For another example, a plurality of fingerprint recognition devices may be disposed side by side under the display screen 120 in a stitching manner, and the sensing areas of the plurality of fingerprint recognition devices together form a sensing area of the electronic device 100, where the sensing area corresponds to the fingerprint detection area 124 of the display screen 120, so that the fingerprint detection area 124 may be extended to a main area of a lower half of the display screen 120, for example, to a usual pressing area of the finger 110, or to a half-screen setting full screen, so as to implement a blind press type fingerprint input operation.

For the electronic device 100, when a user needs to unlock the electronic device 100 or perform other fingerprint verification, the user only needs to press the finger 110 against the fingerprint detection area 124 located on the display screen 120, so as to implement fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 100 adopting the above structure does not need to have a special reserved space on the front surface to set fingerprint keys (such as Home keys), so that a comprehensive screen scheme can be adopted, that is, the display area of the display screen 120 can be basically expanded to the front surface of the whole electronic device 100.

In an embodiment of the present application, as shown in fig. 2, the display screen 120 may be regarded as a multi-layer structure, wherein other structures are included in addition to the pixel layer 121 described above. Specifically, from the upper layer to the lower layer of the display screen 120, the method includes: a pixel layer 121 and a plurality of light blocking layers 122 and 123.

For the plurality of light blocking layers, two or more light blocking layers may be included, and two or three light blocking layers may be generally provided in consideration of the thickness of the display screen 120, for example, as shown in fig. 2, two light blocking layers 122 and 123 are mainly described below as an example, but the present invention is not limited thereto.

Specifically, each of the plurality of light blocking layers has a through-hole array to form a plurality of light guide channels in different directions; wherein the size of the via hole of the one of the plurality of light blocking layers closest to the pixel layer 121 is generally set to be smallest. Accordingly, as shown in fig. 2, for the fingerprint recognition device 130 below the display screen 120, it includes: an optical sensing pixel array disposed under the display screen 120, that is, under the plurality of light blocking layers 122 and 123, wherein each of the plurality of light guiding channels formed by the plurality of light blocking layers 122 and 123 corresponds to one optical sensing pixel. In this way, the plurality of light guide channels can transmit light signals in different directions in the return light signal passing through the finger 110 above to the plurality of optical sensing pixels in the optical sensing pixel array, and each optical sensing pixel is configured to receive the light signal transmitted through the corresponding light guide channel, where the light signal is configured to perform fingerprint identification of the finger 110.

Alternatively, the arrangement of the plurality of light blocking layers in the display 120 may be different, and the fingerprint recognition device 130 may be different, in consideration of different imaging principles. For example, the fingerprint image may be obtained using the principle of aperture imaging, or alternatively, the fingerprint image may be obtained using the principle of lens imaging, as will be described in connection with the various embodiments below.

In the case of performing imaging using the pinhole imaging principle, a through hole of any one of the light blocking layers may be provided for performing pinhole imaging. For convenience of description, one of the light-blocking layers for performing aperture imaging is referred to herein as an aperture imaging layer, and the other layers are still referred to as light-blocking layers. For example, one of the light blocking layers closest to the pixel layer 121 may be provided as a pinhole imaging layer, as shown in fig. 2, that is, the pinhole imaging layer 122 and the light blocking layer 123 are included in the plurality of light blocking layers 122 and 123. The pinhole imaging layer 122 and the light blocking layer 123 will be described in detail below, respectively.

For the aperture imaging layer 122, the aperture imaging layer 122 includes an array of apertures, each aperture in the aperture imaging layer 122 can be configured to perform aperture imaging, i.e., after illuminating the finger 110, each aperture can be configured to perform aperture imaging.

Alternatively, the shape of each aperture in the aperture imaging layer 122 in embodiments of the present application may be the same or different, for example, may be configured as a circle, square, triangle, or the like. In addition, the size of each of the small holes in the small hole imaging layer 122 may be the same or different, and the size of each small hole may be set according to practical applications, for example, according to the screen structure and the optical path. Typically, the smaller the aperture size of the aperture imaging layer 122, the higher the resolution, but the smaller the transmitted light intensity, and if the aperture is too small, the light will be diffracted. For example, to meet the requirement of pinhole imaging, taking a round hole as an example, the diameter of each pinhole in the pinhole imaging layer 122 may be generally set in a range of 5 μm or less. For convenience of description, the embodiments of the present application and the corresponding drawings take the hole array as round holes with the same size as an example, but the embodiments of the present application are not limited thereto.

As for the light blocking layer 123, the light blocking layer 123 includes an array of through holes, and the array of through holes can be regarded as including a plurality of sets of through holes, each of which corresponds to one set of through holes in the small hole imaging layer 122, each set of through holes in the plurality of sets of through holes including a plurality of through holes. Thus, as shown in fig. 2, for any one aperture in the aperture imaging layer 122, a plurality of through holes are corresponding to the aperture imaging layer, and a light signal in a specific direction can pass between each of the plurality of through holes and the aperture, so that each group of through holes and the corresponding aperture can transmit a light signal in a plurality of directions in a return light signal to the fingerprint identification device 130 below, wherein the plurality of directions are the connection line directions between each aperture and the corresponding plurality of through holes.

Alternatively, the light blocking layer 123 in the embodiment of the present application may be provided in one or more layers. For example, considering the display screen thickness, as shown in fig. 2, the light blocking layer 123 may be provided only in one layer. For another example, the light blocking layer 123 may be provided with two or more layers, and in this case, the light blocking layer 123 having a plurality of layers may form a light guide channel, and the direction of the light guide channel may be set according to the light path so that light signals in different directions among the return light signals after imaging through the aperture are transmitted to the fingerprint recognition device 130 below. For convenience of description, a light blocking layer 123 is mainly described below and in the corresponding drawings, but embodiments of the present application are not limited thereto.

Alternatively, the shapes of the through holes in the light blocking layer 123 may be the same or different. For example, the shapes of the through holes included in the same layer of the light-blocking layer 123 may be set to be the same. The shape of the through hole in the light blocking layer 123 may be set to any shape according to practical applications, for example, may be set to a circle, a square, a triangle, or the like. For convenience of explanation, the present application takes an example in which all the through holes included in the light blocking layer 123 are circular.

Alternatively, the size of the via hole of the light blocking layer 123 may be set to any value according to practical applications, for example, typically the size of the via hole of the light blocking layer 123 may be set to be larger than the size of the small hole in the small hole imaging layer 122, for example, the diameter of the circular via hole in the light blocking layer 123 may be in the range of 5 μm to 10 μm. In addition, the sizes of different through holes in the light-blocking layer 123 may be the same or different, for example, a group of through holes in the light-blocking layer 123 corresponding to the same aperture in the aperture imaging layer 122 may be set to be the same size, or all through holes in the light-blocking layer 123 may be set to be the same size. For convenience of explanation, the following description will be given by taking the example that all the through holes in the light blocking layer 123 have the same size.

Accordingly, as shown in fig. 2, for the fingerprint recognition device 130 below the display screen 120, it includes: an optical sensing pixel array disposed under the light blocking layer 123, each through hole in the light blocking layer 123 corresponding to one optical sensing pixel. Wherein each aperture in the aperture imaging layer 122 is for projecting an optical signal returned after passing the finger 110 to the light blocking layer 123; the group of through holes corresponding to each small hole are used for respectively transmitting the light signals in multiple directions in the return light signals to the multiple optical sensing pixels in the optical sensing pixel array, each optical sensing pixel in the optical sensing pixel array is used for receiving the light signals transmitted through the corresponding through hole, that is, the multiple optical sensing pixel arrays corresponding to the same group of through holes are used for receiving the light signals in different directions; the optical signal is used to perform fingerprint recognition of the finger.

In embodiments of the present application, each aperture in aperture imaging layer 122 may enable aperture imaging. Specifically, fig. 4 shows a schematic diagram of the principle of pinhole imaging, where "object" represents the object side of pinhole imaging and "image" represents the image side of pinhole imaging, with a pinhole in the middle, as shown in fig. 4. One of the light emitted from each point of the object on the object side can be projected to the image side through the intermediate aperture, thereby forming an image that is identical to the object on the object side.

However, unlike fig. 4, a light blocking layer 123 is provided under the aperture imaging layer 122 in the display screen 120 of the embodiment of the present application. Specifically, as shown in fig. 5, the light blocking layer 123 corresponds to adding a diaphragm between the intermediate aperture and the image side shown in fig. 4, that is, the light blocking layer 123 corresponds to a diaphragm represented by black between the aperture and the image side in fig. 5. At this time, since the relationship between the object and the image is one-to-one in the aperture imaging process, the optical path selection can be realized by the added aperture, that is, the light blocking layer 123, so that only the optical signals in some directions can be transmitted to the image side, and some other optical signals can be blocked by the light blocking layer 123.

It is to be understood that, as can be seen from the optical path shown in fig. 5, only optical signals in certain directions can pass through due to the light blocking layer 123 provided below the pinhole imaging layer 122. Specifically, as shown in fig. 6, for any one of the small holes in the small hole imaging layer 122, the small hole corresponds to a group of through holes in the light blocking layer 123, which may include at least two through holes therein, for example, 2, 4, or 9, etc., and hereinafter, only 4 are illustrated as examples, namely, 4 through holes numbered 1 to 4 as shown in fig. 6, but the embodiment of the present application is not limited thereto.

Alternatively, the relative positions of a group of through holes and corresponding small holes may be set according to practical applications, and may be set at any positions. In general, a set of through holes may be arranged symmetrically, for example, as shown in fig. 6, with respect to the corresponding small holes, i.e., through holes 1 in fig. 6 are symmetrical with respect to the small holes of the small hole imaging layer 122 and through holes 4, and through holes 2 are symmetrical with respect to the small holes of the small hole imaging layer 122 and through holes 3; or the four through holes are symmetrical with respect to the aperture of the aperture imaging layer 122, that is, the four through holes are distributed in a square shape in the light blocking layer 123. Hereinafter, description will be given of an example in which four through holes are referred to with respect to the aperture of the aperture imaging layer 122 as shown in fig. 6, but the embodiment of the present application is not limited thereto.

It is to be understood that by setting the distance between the aperture imaging layer 122 and the light blocking layer 123, and setting the distribution of the through holes in the light blocking layer 123, the angle of each of the light signals in a plurality of directions passing through the same aperture and a set of through holes can be set to an arbitrary value. Specifically, as shown in fig. 6, the angles between the light signals in the four directions passing through the through holes 1 to 4 and the light blocking layer 123 may be arbitrary values. For example, in the case where four through holes are symmetrical with respect to the aperture of the aperture imaging layer 122, the optical signals in these four directions are at the same angle with the light blocking layer 123. As can be seen from fig. 5, because of the aperture of the through hole in the light blocking layer 123, the transmitted optical signals are approximately conical, so that the same angle between the optical signals transmitted by the four through holes and the light blocking layer 123 as shown in fig. 6 means that: the optical signals in the four directions are correspondingly in four cones, and the included angles between the four cones and the light blocking layer 123 are the same.

Alternatively, the different optical signals transmitted by the group of through holes corresponding to the same aperture may be set to be perpendicular to each other, for example, as shown in fig. 6, the optical signals passing through the four through holes are set to have an angle equal to 45 ° with the light blocking layer 123, and at this time, the optical signals in the four directions are perpendicular to each other.

It should be understood that the description is made of the pinholes of the pinhole imaging layer 122 and the through holes of the light blocking layer 123 described above with reference to the perspective view shown in fig. 6; referring to fig. 6, fig. 7 is a plan view showing the pinholes of the pinhole imaging layer 122 and the through holes of the light blocking layer 123, respectively. Specifically, as shown in fig. 7, 9 boxes are divided herein, each box may be regarded as one recognition area or recognition unit, and each box may correspond to one small square in the fingerprint detection area 124 shown in fig. 3; for these 9 boxes, fig. 7 also shows the adjacent 9 apertures in aperture imaging layer 122, i.e., the 9 smallest circles with shading in fig. 7; each small hole corresponds to 4 circles surrounding the light blocking layer 123, namely, corresponds to 4 through holes shown in fig. 6; in addition, 9 large circles are included in fig. 7, which represent the range of images of the finger after the finger has been imaged by the small-aperture imaging layer 122. Since the light blocking layer 123 is provided, only the through holes in the light blocking layer 123 can transmit light signals of the corresponding direction, i.e., to the respective photo-sensing pixels in the corresponding photo-sensing pixel array, within the image range. In addition, since the pinhole imaging layer 122 and the light blocking layer 123 are provided, most of the stray light is substantially filtered after passing through the two layers, which also effectively reduces background noise caused by the stray light. In addition, in order to prevent the optical paths between the images of the small holes in the adjacent boxes as shown in fig. 7 from interfering with each other, the width between the identification areas indicated by the adjacent boxes can be as large as possible on the premise of meeting the requirements of the integrity and resolution of the received signals.

It should be understood that, in the embodiment of the present application, each optical sensing pixel corresponds to one through hole in the light blocking layer 123, and each optical sensing pixel is disposed on the optical path formed by the corresponding small hole and the through hole, so that a plurality of optical sensing pixel arrays of the same group of through holes can receive optical signals in a plurality of directions, where the plurality of directions are directions of lines between each small hole and the corresponding plurality of through holes. For example, fig. 8 shows another side view of the electronic device 100, corresponding to fig. 2, fig. 8 mainly showing a side view of the display screen 120. As shown in fig. 2 or fig. 8, 4 dashed lines with arrows indicate optical signals in two different directions, each direction is a connection line between one aperture of the aperture imaging layer 122 and one through hole in the light blocking layer 123, and the positions indicated by the arrows are correspondingly provided with an optical sensing pixel array.

Specifically, since each of the photo-sensing pixels is disposed on the optical path formed by the corresponding small hole and the through hole, the distribution of the plurality of photo-sensing pixels corresponding to the plurality of through holes of the same group is disposed similarly to the corresponding through hole. For example, when a group of through holes corresponding to one small hole includes 4 through holes, the 4 through holes correspond to 4 optical sensing pixels in the optical sensing pixel array, and the 4 optical sensing pixels are used for receiving optical signals in 4 directions. For another example, in the case where the same plurality of through holes are symmetrically distributed with respect to the corresponding small holes, the plurality of optical sensing pixels corresponding to the same plurality of through holes are also symmetrically distributed with respect to the corresponding small holes, for example, 4 through holes included in the same plurality of through holes are distributed in a square shape in the light blocking layer 123, and the corresponding 4 optical sensing pixels are also distributed in a square shape in the sensing plane.

It should be appreciated that as shown in fig. 8, 4 areas A, B, C and D in finger 110, after aperture imaging and transmission through the via in light blocking layer 123, are correspondingly received by four optically sensitive pixels a, b, c, and D. That is, the light signals finally exit from the bottom layer of the display screen 120 and are received by the corresponding optical sensing pixels, and the widths of the optical sensing pixels are assumed to be a, b, c and d according to the sizes of the optical sensing pixels, that is, the exiting widths of the light signals are a, b, c and d; correspondingly, the range of the received fingerprint images is A, B, C and D, so that the system needs to reasonably set the thickness and distance of each structural layer in the display screen 120, the distance and size of the small holes in the small hole imaging layer 122, the size and distance of the through holes in the light blocking layer 123, and the like, so that a, b, c and D cannot overlap each other, and meanwhile, no missing fingerprint image exists between A, B, C and D, or A, B, C and D can overlap each other.

In embodiments of the present application, display 120 may also include other structural layers. For example, the display 120 may further include: and a plurality of inorganic material layers. Since the pinhole imaging layer 122 and the light blocking layer 123 are generally made of opaque metal materials, the combination with the inorganic layer is preferable, and the inorganic material layer may be bonded to the upper surface and/or the lower surface of the pinhole imaging layer 122, and the inorganic material layer may be bonded to the upper surface and/or the lower surface of the light blocking layer 123.

For another example, the display screen 120 may further include at least one organic material layer, for example, an organic material layer may be disposed between an inorganic material layer below the pinhole imaging layer 122 and an inorganic material layer above the light blocking layer 123, and/or a lowermost one of the display screen 120 may be an organic material layer, for example, a lowermost one of the display screen may be below an inorganic material layer below the light blocking layer 123. It will be appreciated that the organic layer is inherent to the flexible screen and is defined to be within a range of thicknesses depending on the screen structure, and that the thickness thereof can be adjusted within that range to adjust the light path structure; in the case of a rigid screen, without an organic layer, the optical path structure can be adjusted by adjusting the thickness of the inorganic layer.

Specifically, taking the display 120 as shown in fig. 8 as an example, the layers are numbered 1-11 from the lowest to the uppermost of the display 120. Wherein layer 7 is aperture imaging layer 122 and layer 3 is light blocking layer 123. The layer 1 is an organic material layer, and is a flexible substrate layer, for example, an Active-matrix organic light-emitting diode (AMOLED) substrate, and the thickness and material of the layer are selected to meet the requirements of the screen itself and the requirement of light transmission. The layers 2, 4 and 6 adjacent to the layer 3 and the layer 7 are all inorganic material layers, and the inorganic layers are similar to the film forming structures of the small hole imaging layer 7 and the light blocking layer 3, and are well contacted and cannot fall off (Peeling), so that the small hole imaging layer and the light blocking layer can be optionally wrapped by the inorganic layers; layer 8 is a buffer layer, may be an inorganic material layer, and may be used to grow circuits on the upper surface, i.e., display 120 of embodiments of the present application may also include a circuit layer, i.e., layer 9 shown in fig. 8. The layer 5 is an organic material layer, located between two inorganic material layers, the purpose of which is to increase the flexibility of the screen, and the thickness of which is determined by the imaging size of the apertures on the light-blocking layer, in addition to the flexibility requirements of the screen itself. Layer 10 is a pixel layer 121, i.e., a light emitting layer, and also includes a flexible package.

Optionally, the display screen 120 of the embodiment of the present application may further include a cover plate, for example, as shown in fig. 8, where the layer 11 is an upper surface of the display screen 120 and covers the front surface of the electronic device 100 for protecting the pixel layer, so in the embodiment of the present application, the so-called finger press 110 presses on the display screen 120, and actually means pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate. Alternatively, the cover plate may be a glass cover plate or a sapphire cover plate.

It should be understood that in the case where the pinhole imaging layer 122, the light blocking layer 123, and the optical sensing pixels in the fingerprint recognition device 130 are provided as shown in fig. 6 and 7, 4-direction optical signals may be collected correspondingly. Specifically, as shown in fig. 9, one aperture in the aperture imaging layer 122 corresponds to 4 through holes in the light blocking layer 123, and then 4 optical sensing pixels are correspondingly provided to receive 4 optical signals in different directions, where the optical signals in the 4 directions are numbered 1-4 in fig. 9, that is, the same number in fig. 9 indicates that the received optical signals are in the same direction. That is, the fingerprint recognition device 130 includes an array of optical sensing pixels that can receive light signals in 4 directions as shown in the upper left corner of fig. 9.

It should be understood that the same direction of light signals received by the optical sensing pixel array may be used to generate the same fingerprint image, and then the multiple directions of light signals received by the optical sensing pixel array may be used to generate multiple fingerprint images. Optionally, the electronic device 100 may further comprise a processing unit or processor for generating a fingerprint image for fingerprint identification. Specifically, the processor acquires the light signals with the same direction from among the light signals, taking the light signal with the number 1 shown in fig. 9 as an example, that is, acquires the light signals shown in the upper right-hand corner of fig. 9, and each light signal is a part of the image of the fingerprint. Since the aperture imaging inverts the image, the acquired image is inverted, i.e., as shown in the lower right hand corner of fig. 9, to obtain a fingerprint image. As shown in fig. 9, 4 fingerprint images can be obtained from the 4-directional optical signals.

Optionally, at least one of the acquired plurality of fingerprint images may be used for fingerprint identification; in addition, at least two fingerprint images in the plurality of fingerprint images can also be used for fingerprint anti-counterfeiting authentication. Specifically, the difference between the plurality of fingerprint images may be used to perform fingerprint anti-counterfeit authentication of the finger, for example, as shown in fig. 9, for the two fingerprint images obtained by the numbers 1 and 2, the difference between the two fingerprint images may be used to perform judgment of a true or false finger.

Therefore, in the electronic device 100 according to the embodiment of the present application, by providing the aperture imaging layer and the light blocking layer in the display screen, the optical sensing pixel array having the specific direction of light signal transmitted to the fingerprint identification device below can be guided, so that the optical sensing pixel array can receive the light signals in different directions, thereby implementing the multi-angle light path design in the screen, receiving the light in different directions one to one, and obtaining the high quality image of the same fingerprint from multiple viewing angles after processing, and simultaneously greatly reducing the thickness of the fingerprint identification device or the photosensitive device.

The foregoing describes embodiments for imaging using aperture imaging principles to obtain a fingerprint image, and the following receives embodiments for imaging using lens imaging principles to obtain a fingerprint image.

Optionally, the embodiment of the application also provides another electronic device with the fingerprint identification device. Specifically, referring to the electronic device 100 shown in fig. 2, fig. 10 shows a side view of the electronic device 200 of an embodiment of the present application. As shown in fig. 10, the electronic apparatus 200 includes: a display screen 220 and a fingerprint recognition device 230, wherein the fingerprint recognition device 230 is positioned below the display screen 220 to realize the off-screen optical fingerprint recognition. In addition, as shown in fig. 10, "210" above the display screen 220 represents an object of fingerprint recognition, for example, when the user performs fingerprint recognition, the finger 210 touches the upper surface of the display screen 220.

Specifically, the display 220 includes, from top to bottom: a pixel layer 221 and a plurality of light blocking layers. The pixel layer 221 is consistent with the pixel layer 121 in the electronic device 100, and is not described herein for brevity.

For the plurality of light blocking layers, two or more light blocking layers may be included, and two or three light blocking layers may be generally provided in consideration of the thickness of the display screen 220, for example, as shown in fig. 10, two light blocking layers 222 and 223 are mainly described below as an example, but the present invention is not limited thereto.

Specifically, each of the plurality of light blocking layers has an array of through holes to form a plurality of light guide channels in different directions. The nearest one of the plurality of light blocking layers to the pixel layer 221 is referred to herein as a first light blocking layer, that is, 222 in fig. 10 denotes a first light blocking layer, 223 may denote any one of the light blocking layers below the first light blocking layer, and is referred to herein as a second light blocking layer, wherein the size of the via array of the first light blocking layer 222 is the smallest of the plurality of light blocking layers.

Alternatively, the shapes of the through holes in the plurality of light blocking layers may be the same or different, and the sizes may be the same or different. For example, the shapes of the through holes in the same light-blocking layer may be set to be the same, or the shapes of the through holes in a plurality of light-blocking layers may be set to be the same. For another example, the sizes of the through holes of the same light blocking layer among the plurality of light blocking layers may be set to be the same, and the size of the through hole of each of the plurality of light blocking layers increases from the first light blocking layer downward in order, i.e., the size of the through hole of the first light blocking layer 222 is the smallest, and the size of the through hole of the lowermost light blocking layer is the largest. For convenience of explanation, the following description and the corresponding drawings take the case that the through holes in the plurality of light blocking layers are circular, and the diameters of the circular through holes in the same light blocking layer are the same, but the embodiment of the present application is not limited thereto.

Accordingly, as shown in fig. 10, the fingerprint recognition device 230 under the display 220 may include: a microlens array 231 and an optically sensitive pixel array 232. Wherein the microlens array 231 is disposed under the plurality of light blocking layers; the photo-sensing pixel array 232 is disposed below the microlens array 231, and each of the plurality of light guide channels corresponds to one photo-sensing pixel in the photo-sensing pixel array 232.

The plurality of light guide channels are used for transmitting light signals in different directions in the return light signals passing through the finger 210 to the micro lens array 231, the micro lens array 231 is used for converging the light signals in different directions to a plurality of optical sensing pixels in the optical sensing pixel array 232 respectively, each optical sensing pixel in the optical sensing pixel array 232 is used for receiving the light signals transmitted through the corresponding light guide channel, namely, the optical sensing pixel array 232 is used for receiving the light signals in different directions, and the light signals are used for fingerprint identification of the finger.

It should be appreciated that the electronic device 200 of embodiments of the present application may be imaged by the microlens array 231. Specifically, fig. 11 is a schematic diagram showing the principle of lens imaging, and as shown in fig. 11, "object" represents the object side of lens imaging, and the arrow in the vertical direction represents the object on the object side; the "image" means the image side of the lens image, with the middle being the lens. As shown in fig. 11, the light (various directions) emitted from each point of the object on the object side is recombined together through the intermediate lens to form a corresponding point, thereby being imaged on the image side.

However, unlike fig. 11, a multilayer light blocking layer is provided in the display screen 220 of the embodiment of the present application. Specifically, as shown in fig. 12, the plurality of light blocking layers correspond to a plurality of diaphragms added between the object side and the intermediate lens shown in fig. 11, that is, the plurality of light blocking layers correspond to diaphragms represented by black between the object side and the lens in fig. 12, for example, fig. 12 shows two layers of diaphragms. At this time, since the relation between the object and the image is one-to-one in the lens imaging process, the optical path selection can be realized by the added aperture, namely the light blocking layer, so that only optical signals in certain directions can be converged to the image side through the lens, and other optical signals can be blocked by the light blocking layer.

It should be understood that, as shown in fig. 12, since a plurality of light blocking layers are disposed above the lens, only light signals in certain directions can be converged to the optical sensing pixel array through the lens. Specifically, for convenience of description, a plurality of light guide channels formed of a plurality of light blocking layers are grouped as follows. As shown in fig. 13, for any one of the through holes in the first light-blocking layer 222, the light guide channels passing through the through holes are a group of light guide channels, that is, the same group of light guide channels may pass through the same through hole in the first light-blocking layer 222, and a group of light guide channels may include one or more light guide channels. For example, if each set of light guide channels includes one light guide channel, then the directions of the different sets of light guide channels are different; if each group of light guide channels includes a plurality of light guide channels, the directions of the light guide channels in the same group are different, but the light guide channels in the same direction can be included in different groups.

Taking the two light blocking layers as shown in fig. 10 or fig. 13 as an example, the same group of light guiding channels corresponds to one through hole in the first light blocking layer 222, and the group of light guiding channels may correspond to one or more through holes, for example, 2, 4, or 9, etc., in the second light blocking layer 223. In the following, 4 examples are described, and the four through holes correspond to four light guide channels in different directions, but the embodiment of the application is not limited thereto.

It should be understood that the directions of the same group of light guiding channels may be set according to practical applications, for example, may be set to any value by adjusting the distance between different light blocking layers, the distribution of the through holes in the respective light blocking layers. For example, the same group of light guide channels are symmetrically distributed with respect to the corresponding through holes in the first light blocking layer, and correspondingly, the plurality of optical sensing pixels corresponding to the same group of light guide channels are also symmetrically distributed with respect to the corresponding through holes. As shown in fig. 13, any one of the through holes in the first light blocking layer 222 corresponds to 4 through holes in the second light blocking layer 223, that is, each group of light guide channels includes 4 light guide channels, the 4 light guide channels correspond to 4 light sensing pixels in the light sensing pixel array, and the 4 through holes in the same group of the light blocking layer 223, the 4 light guide channels correspondingly formed, and the 4 light sensing pixels correspondingly formed below may be symmetrically distributed with respect to the small holes of the first light blocking layer 222. For example, 4 through holes of the second light blocking layer 223 and 4 corresponding optical sensing pixels below are respectively distributed in a square shape in fig. 13, and are symmetrical with respect to the small holes of the first light blocking layer 222.

It is to be understood that by setting the distance between the plurality of light blocking layers and the arrangement of the distribution of the through holes in the respective light blocking layers, the angle of each of the light signals of different directions transmitted by the same group of light guide channels may be set to an arbitrary value. Specifically, as shown in fig. 13, the angles between the optical signals in the four directions passing through the 4 through holes of the second light-blocking layer 223 and the second light-blocking layer 223 may be arbitrary values. For example, in the case where four through holes are symmetrical with respect to the through holes of the first light blocking layer 222, the optical signals in the four directions are the same as the included angle of the second light blocking layer 223. As can be seen from fig. 12, because of the apertures of the through holes in the light blocking layers, the transmitted optical signals are approximately conical, so that the same angle between the optical signals transmitted by the four through holes and the second light blocking layer 223 as shown in fig. 13 means that: the optical signals in the four directions correspond to four tapers, which are the same as those of the second light blocking layer 223.

Alternatively, the different optical signals passing through the same group of light guide channels may be arranged to be perpendicular to each other, for example, as shown in fig. 13, the optical signals passing through the four through holes of the second light blocking layer 223 are arranged at an angle equal to 45 ° to the second light blocking layer 223, and at this time, the optical signals in the four directions are perpendicular to each other.

It should be understood that the optical signals transmitted through the light guide channels are collected by the microlens array 231, and the corresponding relationship between each light guide channel and the microlens array 231 may be set according to practical applications. For example, one of the plurality of light guide channels formed by the plurality of light blocking layers may be corresponded to one microlens of the microlens array 231, that is, the light guide channels are in one-to-one correspondence with the microlenses; as another example, as shown in fig. 13, the same group of light guide channels may also be associated with one microlens in the microlens array 231; as another example, as shown in fig. 10, at least two light guide channels intersecting under the plurality of light blocking layers among the plurality of light guide channels correspond to one microlens of the microlens array 231, and the embodiment of the application is not limited thereto.

It should be understood that, in the embodiment of the present application, each optical sensing pixel corresponds to one light guide channel, and each optical sensing pixel is disposed on a corresponding optical path converged by the lens, so that a plurality of optical sensing pixel arrays corresponding to the same group of light guide channels can receive optical signals in a plurality of directions, where the plurality of directions are directions after each light guide channel is converged by the lens. Therefore, the position of each of the photo-sensing pixels in the photo-sensing pixel array 232 in the embodiment of the application is related to the corresponding light guide channel and the position of the optical path where the micro lenses converge.

It should be understood that the above description is made of the through holes of the plurality of light blocking layers with reference to the perspective view shown in fig. 13; referring to fig. 13, fig. 14 correspondingly shows a schematic plan view of the through holes of the plurality of light blocking layers. Specifically, as shown in fig. 14, 9 sets of light guide channels are divided here; for the 9 groups of light guide channels, each group of light guide channels corresponds to one through hole of the first light blocking layer 222, that is, 9 through holes of the first light blocking layer 222 indicated by 9 smallest circles with shading in fig. 14; each of the 9 through holes corresponds to 4 circles surrounding the through holes to represent one group of through holes in the second light blocking layer 223, that is, corresponds to one group of 4 through holes in the second light blocking layer 223 shown in fig. 13, and if each group of through holes is numbered 1 to 4, the optical signals in each group of 4 directions shown in fig. 9 can be obtained corresponding to 4 light guide channels.

It should be understood that the optical sensing pixel array 232 of the embodiment of the present application may be used to generate a plurality of fingerprint images by obtaining optical signals in different directions, where the optical signals in the same direction in the optical signals received by the optical sensing pixel array 232 are used to generate the same fingerprint image. In addition, any one or more of the generated fingerprint images can be used for fingerprint identification, and the differences among different fingerprint images in the fingerprint images can also be used for fingerprint anti-counterfeiting authentication of the finger. Specifically, the electronic device 200 is similar to the electronic device 100, and the obtained fingerprint images are all optical signals including multiple directions, so the fingerprint images obtained by the electronic device 200 are applicable to the related description of fig. 9, and are not repeated herein for brevity.

It should be understood that the display 220 in the embodiment of the present application has a plurality of light blocking layers, and the display 120 has the pinhole imaging layer 122 and the light blocking layer 123, and the description of the display 220 is applicable to the related description of the display 120 except for the differences, and is not repeated herein for brevity.

For example, a fingerprint detection area may be provided on the display 220, and the description of the fingerprint detection area corresponds to the fingerprint detection area 124 of the display 120, which is not described herein for brevity.

As another example, as shown in fig. 10 and 2, if the first light blocking layer 222 in the display screen 220 is substituted for the pinhole imaging layer 122 in the display screen 120 and the second light blocking layer 223 in the display screen 220 is substituted for the light blocking layer 123 in the display screen 120, the structure of the display screen 220 may be identical to that of the display screen 120.

For another example, the display 220 may also include: and a plurality of inorganic material layers respectively for bonding with the upper surface and the lower surface of each of the plurality of light blocking layers. The display 220 may further include at least one organic material layer including: an organic material layer located between two inorganic material layers between two adjacent light-blocking layers of the plurality of light-blocking layers, and/or an organic material layer located below a light-blocking layer closest to the fingerprint recognition device of the plurality of light-blocking layers.

For another example, the display 220 may further include: and a cover plate over the pixel layer 221 for protecting the pixel layer 221. The display 220 may further include: a circuit layer located between the pixel layer 221 and the first light blocking layer 220.

In addition, any one of the photo-sensing pixels in the photo-sensing pixel array 232 in the embodiment of the present application may be similar to any one of the photo-sensing pixels in the fingerprint recognition device 130, for example, any one of the photo-sensing pixels in the photo-sensing pixel array 232 may also be a photo-detector, which is not described herein for brevity.

Therefore, in the electronic device 200 of the embodiment of the present application, a plurality of light blocking layers are disposed in a display screen to form light guide channels in different directions, so as to guide an optical signal with a specific direction to be transmitted to a micro lens array in a fingerprint identification device below, and the micro lens array converges the optical signal to a corresponding optical sensing pixel array, so that the optical sensing pixel array can receive the optical signal in different directions, a multi-angle light path design in the screen is realized, light in different directions is received one to one, a high quality image of the same fingerprint from multiple observation angles can be obtained after processing, and meanwhile, the thickness of the fingerprint identification device or the photosensitive device can be greatly reduced.

It should be understood that, for the electronic device 100 and the electronic device 200 according to the embodiments of the present application, the fingerprint recognition device may further include other components besides the microlens array and/or the optical sensing pixel array described above. For example, the readout circuitry and other ancillary circuitry may also be electrically connected to the photo-sensing pixel array, which may be fabricated on a chip (Die) such as an optical imaging chip or an optical fingerprint sensor with the photo-sensing pixel array by semiconductor processing. For another example, a Filter layer (Filter) or other optical element may be further included above the optical sensing pixel array, and is mainly used to isolate the influence of the external interference light on the optical fingerprint detection. The filter layer may be used to filter out ambient light penetrating the finger, and the filter layer may be set for each optical sensing pixel to filter out interference light, or may also be a large area filter layer to cover the optical sensing pixel array.

For the electronic device 200 of the present application, the microlens array 231 and the optical sensing pixel array 232 may be packaged in the same optical fingerprint component; alternatively, the microlens array 231 may be disposed outside the chip where the optical sensing pixel array 232 is located, for example, attached above the chip where the optical sensing pixel array 232 is located.

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

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

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

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

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a fingerprint identification device, its characterized in that is applicable to the below of display screen in order to realize the optical fingerprint identification under the screen, the display screen includes from top to bottom respectively: a pixel layer and a plurality of light blocking layers,

The pixel layer comprises an array of light emitting display pixels for emitting light and illuminating a finger,

Each of the plurality of light blocking layers has a via array to form a plurality of light guide channels in different directions, a size of the via array of a first light blocking layer closest to the pixel layer among the plurality of light blocking layers being smallest;

the fingerprint recognition device includes:

An optical sensing pixel array disposed below the plurality of light blocking layers, each of the plurality of light guiding channels corresponding to one optical sensing pixel,

The plurality of light guide channels are used for transmitting light signals in different directions in the return light signals passing through the finger to a plurality of optical sensing pixels in the optical sensing pixel array, each optical sensing pixel in the optical sensing pixel array is used for receiving the light signals transmitted through the corresponding light guide channel, and the light signals are used for fingerprint identification of the finger;

The through hole arrays in the plurality of light blocking layers are used for forming a plurality of groups of light guide channels, one through hole in the first light blocking layer correspondingly forms a group of light guide channels, and the group of light guide channels comprises at least two light guide channels with different directions;

The fingerprint recognition device further includes:

and the micro lens array is arranged between the plurality of light blocking layers and the optical sensing pixel array and is used for converging the light signals passing through the plurality of light guide channels in different directions to a plurality of optical sensing pixels in the optical sensing pixel array respectively.

2. The fingerprint recognition device according to claim 1, wherein the optical signals in the same direction among the optical signals received by the optical sensing pixel array are used to generate the same fingerprint image, and the optical signals in multiple directions received by the optical sensing pixel array are respectively used to generate multiple fingerprint images.

3. The fingerprint identification device according to claim 2, wherein a difference between at least two fingerprint images of the plurality of fingerprint images is used for performing fingerprint anti-counterfeit authentication of the finger.

4. The fingerprint recognition device according to claim 1, wherein each through hole in the first light blocking layer is for realizing small hole imaging.

5. The fingerprint identification device of claim 1, wherein one of the plurality of light guide channels corresponds to one of the microlens array.

6. The fingerprint identification device according to claim 1, wherein at least two of the plurality of light guide channels intersecting under the plurality of light blocking layers correspond to one microlens of the microlens array.

7. The fingerprint identification device of claim 1, wherein one of the plurality of sets of light guide channels corresponds to one of the array of microlenses.

8. The fingerprint identification device according to claim 1, wherein the same group of light guiding channels are symmetrically distributed with respect to corresponding through holes in the first light blocking layer, and a plurality of optically sensitive pixels corresponding to the same group of light guiding channels are symmetrically distributed with respect to the corresponding through holes.

9. The fingerprint identification device of claim 8, wherein each of the plurality of sets of light guide channels comprises 4 light guide channels, the 4 light guide channels corresponding to 4 light sensing pixels in the array of light sensing pixels.

10. The fingerprint recognition device according to claim 9, wherein the 4 optical sensing pixels corresponding to the same group of light guide channels are respectively distributed in a square shape.

11. The fingerprint recognition device of claim 9, wherein the 4 optical sensing pixels receive 4 directions of optical signals perpendicular to each other.

12. The fingerprint recognition device according to claim 1, wherein the through holes of the same light blocking layer among the plurality of light blocking layers are identical in shape.

13. The fingerprint recognition device according to claim 12, wherein all of the through holes in the plurality of light blocking layers are identical in shape and are all circular.

14. The fingerprint recognition device according to claim 12, wherein the sizes of the through holes of the same one of the plurality of light blocking layers are the same, and the sizes of the through holes of each of the plurality of light blocking layers increase in order from the first light blocking layer.

15. The fingerprint recognition device according to claim 14, wherein the diameter of the aperture in the first light-blocking layer is less than or equal to 5 μm.

16. The fingerprint recognition device according to claim 14, wherein the diameter of the through hole in the other light-blocking layers than the first light-blocking layer among the plurality of light-blocking layers is in a range of 5 μm to 10 μm.

17. The fingerprint identification device of claim 1, wherein the display screen further comprises: a plurality of inorganic material layers are arranged on the surface of the substrate,

The plurality of inorganic material layers are respectively used for being attached to the upper surface of each light-blocking layer of the plurality of light-blocking layers and the lower surface of each light-blocking layer.

18. The fingerprint recognition device of claim 17, wherein the display screen further comprises at least one organic material layer,

The at least one organic material layer comprises:

an organic material layer located between two inorganic material layers between adjacent two of the plurality of light-blocking layers, and/or,

And an organic material layer positioned below a light blocking layer closest to the fingerprint recognition device among the plurality of light blocking layers.

19. The fingerprint recognition device of any one of claims 1-18, wherein the display screen further comprises: and the cover plate is positioned above the pixel layer and used for protecting the pixel layer.

20. The fingerprint recognition device according to any one of claims 1-18, further comprising: and a circuit layer between the pixel layer and the first light blocking layer.

21. An electronic device, comprising:

a fingerprint recognition device according to any one of claims 1 to 20; and

And the fingerprint identification device is positioned below the display screen.

22. The electronic device of claim 21, further comprising: a processing unit for:

generating a plurality of fingerprint images respectively according to the light signals in a plurality of directions received by the optical sensing pixel array;

And carrying out fingerprint identification on the finger according to the plurality of fingerprint images.

23. The electronic device of claim 22, wherein the processing unit is configured to:

and generating the same fingerprint image by using the same optical signals in the directions in the optical signals received by the optical sensing pixel array.

24. The electronic device of claim 23, wherein the processing unit is further configured to:

and determining whether the finger is a true finger according to the difference between at least two fingerprint images in the plurality of fingerprint images.