CN211742124U

CN211742124U - Fingerprint identification device, display screen and electronic equipment

Info

Publication number: CN211742124U
Application number: CN202020255584.8U
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: 2020-10-23
Anticipated expiration: 2030-03-03

Abstract

The embodiment of the application relates to a fingerprint identification device, a display screen and electronic equipment, and the thickness of the fingerprint identification device is reduced while multi-angle optical signals can be received. This display screen includes respectively from last to down: the light-emitting display device comprises a pixel layer and a plurality of light blocking layers, wherein the pixel layer is provided with a light-emitting display pixel array, and 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 includes: the optical sensing pixel array is arranged below the light blocking layers, each light guide channel in the light guide channels corresponds to one optical sensing pixel, the light guide channels are used for transmitting optical signals in different directions in return optical signals passing through a finger to the optical sensing pixels in the optical sensing pixel array, each optical sensing pixel is used for receiving the optical signals transmitted through the corresponding light guide channel, and the optical 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 identification, in particular to a fingerprint identification device, a display screen and electronic equipment.

Background

Optical fingerprint systems under screens have been mass produced in electronic products such as smart phones. At present, most of the principle of fingerprint identification under a screen is that a finger fingerprint is irradiated by spontaneous light of the screen, and reflected light of the finger penetrates through the screen and is collected and identified by photoelectric detection equipment under the screen.

In order to improve the identification area of a fingerprint signal and receive more fingerprint information, a complex light path is usually designed inside a fingerprint device under a screen, so that multi-angle light can be received, and the fingerprint device can be used for higher-level functions such as anti-counterfeiting and the like. However, the complicated light path can thicken the finger print device under the screen, and the trend that the finger print under the screen is thinner in the future is not met.

SUMMERY OF THE UTILITY MODEL

The application provides a fingerprint identification device, display screen and electronic equipment, when can realizing receiving multi-angle light signal, reduces fingerprint identification device's thickness.

In a first aspect, a fingerprint identification device is provided, which is suitable for optical fingerprint identification under a display screen below the display screen, the display screen includes from top to bottom respectively: the light guide device comprises a pixel layer and a plurality of light blocking layers, wherein the pixel layer comprises a light emitting display pixel array which is used for emitting light and irradiating fingers, 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, and the size of the through hole array of the first light blocking layer closest to the pixel layer in the plurality of light blocking layers is the smallest; the fingerprint identification device comprises: and the optical sensing pixel array is arranged below the light blocking layers, each light guide channel in the light guide channels corresponds to one optical sensing pixel, the light guide channels are used for transmitting optical signals in different directions in return optical signals passing through the finger to the optical sensing pixels in the optical sensing pixel array, each optical sensing pixel in the optical sensing pixel array is used for receiving the optical signals transmitted through the corresponding light guide channel, and the optical signals are used for fingerprint identification of the finger.

Therefore, the fingerprint identification device of this application embodiment, the setting is in the below of display screen, through set up a plurality of layers of being in the light in order to form the light guide channel of equidirectional not in the display screen, and then the optical sensing pixel array among the fingerprint identification device of guide specific direction transmission to below, make optical sensing pixel array can receive the light signal of equidirectional not, the design of the multi-angle light path in the screen has been realized, the light of equidirectional not is received to one-to-one, can obtain the complete high quality image of same fingerprint from a plurality of observation angles after handling, can also reduce fingerprint identification device or sensitization device's thickness simultaneously by a wide margin.

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 for performing fingerprint anti-counterfeit authentication on the finger.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the through hole arrays in the light blocking layers are used to form multiple groups of light guide channels, one through hole in the first light blocking layer correspondingly forms one group of light guide channels, and the group of light guide channels includes at least two light guide 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 for realizing pinhole imaging.

Under the condition, the light blocking layers arranged in the display screen comprise the light blocking layer capable of being used for small hole imaging and at least one other light blocking layer, and after imaging is carried out by utilizing a small hole imaging principle, the optical sensing pixel array in the fingerprint identification device below can be guided to transmit the optical signals with the specific direction, so that the optical sensing pixel array can receive the optical 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 light blocking layers and the optical sensing pixel array and is used for respectively converging the optical signals passing through the light guide channels in different directions to the optical sensing pixels in the optical sensing pixel array.

Under the condition, 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 transmit to a micro lens array in a fingerprint identification device below, the micro lens array converges the light signals to a corresponding optical sensing pixel array, namely imaging is carried out according to the micro lens imaging principle, 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, 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, in another implementation manner of the first aspect, at least two light guide channels intersecting below the 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, in another implementation manner of the first aspect, one of the light guide channels in the multiple sets of light guide channels corresponds to one microlens in the microlens array.

With reference to the first aspect and the foregoing implementation manner, 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, in another implementation manner of the first aspect, each of the light guide channels in the multiple sets 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, in another implementation manner of the first aspect, the 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 optical signals received by the 4 optical sensing pixels in 4 directions are 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, the through holes of the same light-blocking layer in the plurality of light-blocking layers have the same shape.

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

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the through holes of the same light-blocking layer in the plurality of light-blocking layers have the same size, and the size of the through hole of each light-blocking layer in the plurality of light-blocking layers increases from the first light-blocking layer to the bottom in sequence.

With reference to the first aspect and the foregoing implementations of the first aspect, in another implementation of the first aspect, the 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, in another implementation manner of the first aspect, diameters of through holes in other light-blocking layers except for the first light-blocking layer in the plurality of light-blocking layers range from 5 μm to 10 μm.

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

Therefore, the display screen of this application embodiment, wherein be provided with a plurality of light blocking layers in order to form the light guide channel of equidirectional, and then the light signal that the guide has specific direction transmits the corresponding optical sensing pixel array in the fingerprint identification device of below, make optical sensing pixel array can receive the light signal on the equidirectional, the design of multi-angle light path in the screen has been realized, the light of equidirectional not one to one receipt, can obtain the complete high quality image of same fingerprint from a plurality of observation angles after handling, can also reduce fingerprint identification device or photosensitive device's thickness by a wide margin simultaneously.

With reference to the second aspect, in an implementation manner of the second aspect, the display screen further includes: and the multiple inorganic material layers are respectively used for being attached to the upper surface of each light blocking layer in the plurality of light blocking layers and are 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: the organic material layer is positioned between two inorganic material layers between two adjacent light-blocking layers in the plurality of light-blocking layers, and/or the organic material layer is positioned below the light-blocking layer which is closest to the fingerprint identification device in the plurality of light-blocking layers.

With reference to the second aspect and the foregoing implementation manner, in another implementation manner of the second aspect, the through hole arrays in the light blocking layers are used to form 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 includes at least two light guide 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 are symmetrically distributed with respect to the 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 of the light guide channels in the multiple sets of light guide channels includes 4 light guide channels.

With reference to the second aspect and the foregoing implementation manner, in another implementation manner of the second aspect, the through holes in each light blocking layer that belong to the same group of light guide 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, the 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, the through holes of the same light-blocking layer in the plurality of light-blocking layers have the same shape.

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

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

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 of the same light-blocking layer in the plurality of light-blocking layers have the same size.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, the size of the through holes of each of the plurality of light-blocking layers sequentially increases from the first light-blocking layer downward.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in another implementation manner of the second aspect, the diameter of the small hole 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, in another implementation manner of the second aspect, diameters of through holes in other light-blocking layers except for the first light-blocking layer in the plurality of light-blocking layers range from 5 μm to 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: a circuit layer between the pixel layer and the first light blocking layer.

In a third aspect, an electronic device is provided, which includes the fingerprint identification device as described in the first aspect or any possible implementation manner of the first aspect, and a display screen as described in the second aspect or any possible implementation manner of the second aspect, where the fingerprint identification device is located below the display screen.

Therefore, the electronic equipment of this application embodiment, through set up a plurality of layers of being in the light in order to form the light guide channel of equidirectional in the display screen, and then the light signal that the guide has specific direction transmits the corresponding optical sensing pixel array in the fingerprint identification device of below, make optical sensing pixel array can receive the light signal on the equidirectional, the multi-angle light path design in the screen has been realized, the not equidirectional light of one-to-one receipt, can obtain the complete high quality image of same fingerprint from a plurality of observation angles after handling, can also reduce fingerprint identification device or sensitization device's thickness by a wide margin simultaneously.

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 optical signals in the plurality of directions received by the optical sensing pixel array; and performing 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 optical signals with the same direction in the optical signals with the multiple directions 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: determining whether the finger is a real finger based on a difference between at least two of the plurality of fingerprint images.

Drawings

FIG. 1 is a schematic diagram of an underscreen fingerprint identification module.

Fig. 2 is a side view of an electronic device with an underscreen fingerprint recognition apparatus according to 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 according to an embodiment of the present application.

Fig. 6 is a schematic perspective view of a corresponding 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 a correspondence relationship between a small hole 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 application.

FIG. 10 is a side view of another electronic device with an underscreen fingerprint identification apparatus according to 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 schematic perspective view illustrating a corresponding relationship among a plurality of light blocking layers, a microlens array, and an optically sensitive pixel array according to an embodiment of the present disclosure.

Fig. 14 is a schematic plan view of a correspondence relationship 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 devices. Such as portable or mobile computing devices, e.g., smart phones, laptops, tablets, gaming devices, etc., and other electronic devices, e.g., electronic databases, automobiles, Automated Teller Machines (ATMs), etc. However, the present embodiment is not limited thereto.

The technical scheme of the embodiment of the application can be used for the biological feature recognition technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, and living body recognition. For convenience of explanation, the fingerprint identification technology is described as an example below.

The technical scheme of the embodiment of the application can be used for the technology of fingerprint identification under the screen. Fingerprint identification technique is installed in the display screen below with fingerprint identification module under the screen to realize carrying out the fingerprint identification operation in the display area of display screen, need not set up the fingerprint collection region in the positive region except that the display area of electronic equipment. Specifically, the fingerprint identification module uses the light that returns from the top surface of electronic equipment's display module to carry out fingerprint response and other response operations. This returned light carries information about objects (e.g., fingers) 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 underscreen fingerprint recognition by capturing and detecting this returned light. The fingerprint identification module can be designed to realize desired optical imaging by properly configuring an optical element for collecting and detecting returned light, so as to detect fingerprint information of the finger.

In order to improve the identification area of a fingerprint signal and receive more fingerprint information, a complex light path is usually designed inside a fingerprint device under a screen, so that multi-angle light can be received, and the fingerprint device can be used for higher-level functions such as anti-counterfeiting and the like. For example, in order to receive light from multiple angles, an underscreen fingerprint recognition module shown in fig. 1 may be used, which may also be called a Sensor (Sensor), and a light path is designed by reasonably designing the positions of a lens and a diaphragm inside the Sensor.

Specifically, as shown in fig. 1, the fingerprint identification module is located below the display screen, and the fingerprint identification module may include a lens layer including a plurality of lenses, for example, a microlens array. The fingerprint identification module further includes a plurality of layers of diaphragms, for example, two layers of diaphragms, namely, a diaphragm 1 and a diaphragm 2 are illustrated in fig. 1, the plurality of layers of diaphragms are both 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. Optical path media, for example, three optical path media, i.e., optical path media 1-3, as shown in fig. 1, may also be disposed between the multiple layers of diaphragms, wherein the materials of the different optical path media may be the same or different. In addition, below multilayer diaphragm, this fingerprint identification module still includes photosensitive device to be arranged in receiving the light signal of the multiple direction of leaded light through transmission in the multilayer diaphragm, the light signal of these different directions can be used for carrying out fingerprint identification.

The externally-hung Sensor under the screen shown in fig. 1 can select a light path incident at a specified angle to project on 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 becomes thicker, which is not in accordance with the trend that fingerprints under the screen become thinner in the future.

Therefore, in order to solve the above problem and shorten the optical length of the system, the embodiments of the present application provide a variety of fingerprint recognition devices and electronic apparatuses.

Fig. 2 illustrates 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 identification device 130, wherein the fingerprint identification device 130 is located below the display screen 120 to realize the optical fingerprint identification under the screen. In addition, as shown in fig. 2, "110" above the display screen 120 indicates 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 is to be understood that the display 120 in the embodiment of the present application may be a self-luminous display that employs display units having self-luminescence as display pixels. For example, the display screen 120 may be an Organic Light-emitting diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. In other alternative embodiments, the Display 120 may also be a Liquid Crystal Display (LCD) or other passive light emitting Display, which is not limited in this embodiment of the present application. For convenience of description, the display screen 120 is exemplified as an OLED screen, that is, as shown in fig. 2, the display screen 120 includes a pixel layer 121, the pixel layer 121 includes a light-emitting display pixel array for emitting light to display an image, and in addition, when fingerprint recognition is performed, the light-emitting display pixel can also be used as a light source, which can emit light and illuminate the finger 110, so as to generate a return light signal passing through the finger 110.

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

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

Further, the display screen 120 may also be specifically a touch display screen, which not only can perform image display, but also can detect a touch or pressing operation of a user, thereby providing a human-computer interaction interface for the user. For example, in one embodiment, the electronic device 100 may include a touch sensor, which may be embodied as a Touch Panel (TP), and may be disposed on a surface of the display screen 120, or may be partially integrated or entirely integrated inside the display screen 120, so as to form the touch display screen.

It should be understood that the fingerprint identification device 130 in the embodiment of the present application includes an optical sensing pixel array, and the area where the optical sensing pixel array is located or the sensing area thereof is a sensing area of the fingerprint identification device 130, which corresponds to a fingerprint detection area (also referred to as a fingerprint collection area, a fingerprint identification area, etc.) on the display screen 120. For example, each optically sensitive pixel in the array of optically sensitive pixels may be a photodetector, i.e. the array of optically sensitive pixels may particularly be an array of photodetectors (Photo detectors), which comprise a plurality of photodetectors distributed in an array. Wherein the fingerprint recognition device 130 may be disposed in a partial area under 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 identification device 130 may or may not be located directly below the fingerprint detection area of the display screen 120 according to the arrangement of the optical path. In addition, due to different optical path configurations, in some embodiments of the present application, a range of an area where the optically sensitive pixel array of the fingerprint identification device 130 is located or a range of a sensitive area of the fingerprint identification device 130 may be equal to or different from a range of a fingerprint detection area on the display screen 120 (or a fingerprint detection area corresponding to the fingerprint identification device 130), which is not specifically limited in this embodiment of the present application. For example, 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 by a reflective folded light path design or other light design.

It should be understood that the range of the fingerprint detection area in the display screen 120 of 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 the display 120 of the present embodiment is labeled 124. Alternatively, as shown in the left diagram of fig. 3, the fingerprint detection area 124 of the display screen 120 may be small 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 performing fingerprint input, otherwise the fingerprint identification device 130 may not capture a fingerprint image and the user experience is poor. In this case, the fingerprint detection area 124 may be generally set to be a square having a side length of 2.5 to 3cm so that information of a 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 diagram 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, a fingerprint sensing device may be provided that includes a sufficient number of optically sensitive pixels to increase the extent of the fingerprint detection area 124. For another example, a plurality of fingerprint identification devices may be arranged side by side below the display screen 120 in a splicing manner, and sensing areas of the plurality of fingerprint identification devices jointly form a sensing area of the electronic device 100, which 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 portion of the display screen 120, for example, to an area that the finger 110 conventionally presses, or to a half screen that is arranged in a full screen, thereby implementing a blind-touch fingerprint input operation.

For the electronic device 100, when a user needs to unlock or otherwise verify a fingerprint of the electronic device 100, the user only needs to press the finger 110 on the fingerprint detection area 124 of the display screen 120, so as to input the fingerprint. Since fingerprint detection can be implemented in the screen, the electronic device 100 with the above structure does not need to reserve a space on the front surface thereof to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, that is, the display area of the display screen 120 can be substantially extended to the front surface of the whole electronic device 100.

In the embodiment of the present application, as shown in fig. 2, the display screen 120 can be regarded as a multi-layer structure, which includes other structures besides the pixel layer 121 described above. Specifically, the display screen 120 includes, from the upper layer to the lower layer: 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 disposed in consideration of the thickness of the display screen 120, for example, as shown in fig. 2, and hereinafter, two light-blocking

layers

122 and 123 are mainly described as an example, but the present invention is not limited thereto.

Specifically, 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; among them, the size of the through hole of the light-blocking layer closest to the pixel layer 121 among the plurality of light-blocking layers is generally set to be the smallest. Accordingly, as shown in fig. 2, the fingerprint recognition device 130 under the display screen 120 includes: the array of optically sensitive pixels is disposed under the display screen 120, that is, under the plurality of light blocking layers 122 and 123, and each of the plurality of light guide channels formed by the plurality of light blocking layers 122 and 123 corresponds to one optically sensitive pixel. In this way, the plurality of light guide channels can transmit light signals of different directions in the return light signal passing through the finger 110 above to the plurality of optically sensitive pixels in the array of optically sensitive pixels, and each of the optically sensitive pixels is configured to receive the light signal transmitted through the corresponding light guide channel, which is used for fingerprint recognition of the finger 110.

Alternatively, the arrangement of the light blocking layers in the display screen 120 may be different, and the fingerprint recognition device 130 may also be different, in view of different imaging principles. For example, the fingerprint image may be obtained by using pinhole imaging principle, or the fingerprint image may be obtained by using lens imaging principle, which will be described below with reference to different embodiments.

For the imaging by using the pinhole imaging principle, the through hole of any one of the light-blocking layers can be set to be used for pinhole imaging. For convenience of description, one of the light-blocking layers for performing pinhole imaging is referred to herein as a pinhole imaging layer, and the other layers are still referred to as light-blocking layers. For example, one of the plurality of light-blocking layers closest to the pixel layer 121 may be provided as an aperture imaging layer, as shown in fig. 2, i.e., the plurality of light-blocking

layers

122 and 123 include an aperture imaging layer 122 and a light-blocking layer 123. Detailed descriptions of aperture imaging layer 122 and light blocking layer 123 are provided below, respectively.

For the pinhole imaging layer 122, the pinhole imaging layer 122 includes an array of pinholes, and each pinhole in the pinhole imaging layer 122 can implement pinhole imaging, that is, after the light irradiates the finger 110, pinhole imaging can be implemented through each pinhole.

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

For the light-blocking layer 123, the light-blocking layer 123 includes an array of vias, and the array of vias can be considered to include a plurality of sets of vias, each via in the aperture imaging layer 122 corresponding to a set of vias in the plurality of sets of vias, each set of vias in the plurality of sets of vias including a plurality of vias. Thus, as shown in fig. 2, for any one of the apertures in the aperture imaging layer 122, a plurality of through holes are provided, and a light signal with a specific direction can pass through between each of the plurality of through holes and the aperture, so that each set of through holes and the corresponding aperture can transmit a light signal with a plurality of directions in the return light signal to the fingerprint identification device 130 below, wherein the plurality of directions are the connecting 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 with one or more layers. For example, considering the thickness of the display screen, as shown in fig. 2, the light blocking layer 123 may be provided as only one layer. For another example, the light-blocking layer 123 may also be provided with two or more layers, in this case, the light-blocking layer 123 with multiple layers may form a light-guiding channel, and the direction of the light-guiding channel may be set according to the light path, so that the light signals in different directions in the return light signal after being imaged through the pinhole are transmitted to the fingerprint recognition device 130 below. For convenience of description, the light blocking layer 123 is mainly described below and in the corresponding drawings, but the embodiment of the present application is 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 holes in the light blocking layer 123 may be set to any shape according to practical applications, and for example, may be set to be circular, square, or triangular. For convenience of description, the present application takes as an example that all the through holes included in the light blocking layer 123 are circular.

Alternatively, the size of the through holes of the light-blocking layer 123 can be set to any value according to practical applications, for example, the size of the through holes of the light-blocking layer 123 is generally set to be larger than the size of the small holes in the small hole imaging layer 122, for example, the diameter of the circular through holes in the light-blocking layer 123 can range from 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 taking as an example that all the through holes in the light-blocking layer 123 are the same in size.

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

In the present embodiment, each aperture in the aperture imaging layer 122 can implement aperture imaging. Specifically, fig. 4 shows a schematic diagram of the principle of pinhole imaging, as shown in fig. 4, an "object" indicates an object side of pinhole imaging, an "image" indicates an image side of pinhole imaging, and a pinhole is in the middle. One of the light beams 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 which is the same as the object on the object side.

However, unlike fig. 4, the light blocking layer 123 is disposed under the aperture imaging layer 122 in the display screen 120 according to 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, in the pinhole imaging process, the relationship between the object and the image is in one-to-one correspondence, so the added diaphragm, that is, the light blocking layer 123 can implement optical path selection, so that only optical signals in some directions can be transmitted to the image side, and other optical signals can be blocked by the light blocking layer 123.

It will be appreciated that, as can be seen from the optical path shown in fig. 5, since the light blocking layer 123 is disposed below the pinhole imaging layer 122, only optical signals in certain directions can pass through. 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 set of through holes in the light blocking layer 123, and the set of through holes may include at least two through holes, for example, 2, 4, or 9, and the like, and the following description will be made only by taking 4 as an example, that is, 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 the set of through holes and the corresponding small holes can be set according to practical application, and can be set at any position. In general, a set of through holes may be arranged in a symmetrical distribution, for example, as shown in fig. 6, a set of through holes may be arranged in a symmetrical distribution with respect to the corresponding pinholes, that is, through hole 1 in fig. 6 is symmetrical with respect to the pinhole of the pinhole imaging layer 122 and through hole 4, and through hole 2 is symmetrical with respect to the pinhole of the pinhole imaging layer 122 and through hole 3; alternatively, the four through holes are symmetrical with respect to the apertures of the aperture imaging layer 122, that is, the four through holes are distributed in a square shape in the light blocking layer 123. The following description will be given taking as an example that four through holes are symmetrical 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 should 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 vias in the light blocking layer 123, the angle of each of the plurality of directions of light signals passing through the same aperture and a set of vias can be set to any value. Specifically, as shown in fig. 6, the included angles between the light signals passing through the through holes 1-4 in four directions and the light blocking layer 123 may be any value. For example, in the case where four through holes are symmetrical with respect to the aperture of the aperture imaging layer 122, the light signals in the four directions are at the same angle with the light blocking layer 123. As can be seen from fig. 5, due to the arrangement of the apertures of the through holes in the light-blocking layer 123, the optical signals transmitted by the through holes are substantially tapered, so that the angles between the optical signals transmitted by the four through holes and the light-blocking layer 123 shown in fig. 6 are the same: the light signals in four directions correspondingly form 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 a group of through holes corresponding to the same aperture may be arranged perpendicular to each other, for example, as shown in fig. 6, the optical signals passing through four through holes are arranged at an angle equal to 45 ° with respect to the light blocking layer 123, and at this time, the optical signals in four directions are perpendicular to each other.

It should be understood that the foregoing description, in conjunction with the perspective view shown in fig. 6, describes the apertures of the aperture imaging layer 122 and the vias of the light blocking layer 123; referring to fig. 6, fig. 7 is a schematic plan view correspondingly illustrating the pinholes of the pinhole imaging layer 122 and the through holes of the light blocking layer 123. Specifically, as shown in fig. 7, there are 9 boxes divided, each box can be regarded as an identification area or an identification unit, and each box can correspond to a small square in the fingerprint detection area 124 shown in fig. 3; for the 9 boxes, FIG. 7 also shows the adjacent 9 apertures in the aperture imaging layer 122, i.e., the 9 smallest circles with shading in FIG. 7; each small hole corresponds to a group of surrounding 4 circles to represent a group of through holes in the light blocking layer 123, i.e., corresponds to a group of 4 through holes shown in fig. 6; in addition, fig. 7 also includes 9 large circles, which show the range of the image after the pinhole imaging layer 122 images the finger for pinholes. Due to the light-blocking layer 123, within the range of the image, only the through holes in the light-blocking layer 123 can transmit the optical signal in the corresponding direction, that is, the optical signal is transmitted to each optical sensing pixel in the corresponding optical sensing pixel array. In addition, because the pinhole imaging layer 122 and the light blocking layer 123 are arranged, most stray light is basically filtered after passing through the two layers, and the background noise caused by the stray light is effectively reduced. In addition, in order to prevent the optical paths between the images of the small holes in the adjacent boxes from interfering with each other as shown in fig. 7, the width between the identification areas represented by the adjacent boxes can be as large as possible under the premise of meeting the requirements of the integrity and the resolution of the received signals.

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

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

It will be appreciated that 4 regions A, B, C and D in finger 110, as shown in FIG. 8, are received by the four photo-sensing pixels a, b, c and D, respectively, after being imaged by the aperture and transmitted through the via in light blocking layer 123. That is, the optical signal finally exits from the bottom layer of the display screen 120 and is received by the corresponding photo sensor pixel, and the widths of the photo sensor pixel are assumed to be a, b, c, and d, i.e., the exiting widths of the optical signal are a, b, c, and d; correspondingly, the range of the received fingerprint images is A, B, C and D, the system needs to set the thickness and distance of each structural layer in the display screen 120, the pitch 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 reasonably, so that a, b, c, and D cannot overlap with each other, and meanwhile, no missing fingerprint image exists between A, B, C and D, or A, B, C and D can overlap with each other.

In the embodiment of the present application, the display screen 120 may further include other structural layers. For example, the display screen 120 may further include: a plurality of inorganic material layers. Since the aperture imaging layer 122 and the light blocking layer 123 are typically made of opaque metal material, which is preferably combined with an inorganic layer, the inorganic material layer may be attached to the upper surface and/or the lower surface of the aperture imaging layer 122, and the inorganic material layer may be attached to the upper surface and/or the lower surface of the light blocking layer 123.

For another example, the display 120 may further include at least one organic material layer, for example, an organic material layer may be disposed between the inorganic material layer below the small-hole imaging layer 122 and the inorganic material layer above the light-blocking layer 123, and/or the lowermost layer of the display 120 may be an organic material layer, for example, the lowermost layer may be below the inorganic material layer below the light-blocking layer 123. It will be appreciated that the organic layer is inherent to the flexible screen and its thickness is specified in a range according to the screen structure, within which range its thickness can be adjusted to adjust the optical path structure; in 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 screen 120 shown in fig. 8 as an example, the layers are numbered 1-11 from the lowermost to the uppermost of the display screen 120. Wherein layer 7 is an aperture imaging layer 122 and layer 3 is a 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) intrinsic 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 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, are in good contact and cannot fall off (Peeling), so that the small-hole imaging layer and the light blocking layer can be selectively wrapped by the inorganic layers; the layer 8 is a buffer layer, and may also be an inorganic material layer, and may also be used to grow a circuit on the upper surface, i.e. the display screen 120 of the embodiment of the present application may also include a circuit layer, i.e. the layer 9 shown in fig. 8. The layer 5 is an organic material layer and is located between two inorganic material layers, the purpose of which is to increase the flexibility of the screen, and its thickness is determined by the size of the aperture formed on the light-blocking layer, in addition to the flexibility requirement of the screen itself. Layer 10 is a pixel layer 121, i.e. a light emitting layer, also comprising a flexible encapsulation.

Optionally, the display screen 120 of the embodiment of the present application may further include a cover plate, for example, the layer 11 as shown in fig. 8 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 presses on the cover plate above the display screen 120 or covers a surface of a 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 of disposing the pinhole imaging layer 122, the light blocking layer 123 and the optically sensitive pixels in the fingerprint identification device 130 as shown in fig. 6 and 7, optical signals of 4 directions can be correspondingly collected. Specifically, as shown in fig. 9, a small hole in the small-hole imaging layer 122 corresponds to 4 through holes in the light blocking layer 123, and then 4 corresponding optically sensitive pixels 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 directions of the received optical signals are the same. That is, the fingerprint recognition device 130 includes an array of optically sensitive pixels that can receive light signals in 4 directions as shown in the upper left-hand diagram of FIG. 9.

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

Optionally, at least one of the acquired multiple 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 a plurality of fingerprint images can be used for performing fingerprint anti-counterfeiting authentication of the finger, for example, as shown in fig. 9, for two fingerprint images obtained by number 1 and number 2, the difference between the two fingerprint images can be used for determining whether the finger is true or false.

Therefore, electronic equipment 100 of the embodiment of the application, through set up aperture formation of image layer and the layer that is in the light in the display screen, can guide the optical sensing pixel array that has the optical signal transmission of specific direction to the fingerprint identification device of below, make optical sensing pixel array can receive the optical signal on the equidirectional not, multi-angle light path design in the screen has been realized, the light of equidirectional not one to one receipt, can obtain the complete high quality image of same fingerprint from a plurality of observation angles after handling, can also reduce fingerprint identification device or photosensitive device's thickness by a wide margin simultaneously.

While the embodiment of imaging using the pinhole imaging principle to obtain a fingerprint image has been described above, the embodiment of imaging using the lens imaging principle to obtain a fingerprint image is received below.

Optionally, another electronic device with a fingerprint identification device is further provided in the embodiments of the present application. Specifically, fig. 10 shows a side view of an electronic device 200 of an embodiment of the present application, in comparison to the electronic device 100 shown in fig. 2. As shown in fig. 10, the electronic apparatus 200 includes: a display screen 220 and a fingerprint identification device 230, wherein the fingerprint identification device 230 is located below the display screen 220 to realize the optical fingerprint identification under the screen. In addition, as shown in fig. 10, "210" above the display screen 220 indicates 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 screen 220 includes, from top to bottom: a pixel layer 221 and a plurality of light blocking layers. The pixel layer 221 is identical to the pixel layer 121 in the electronic device 100, and for brevity, the description is omitted here.

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, and hereinafter, two light-blocking

layers

222 and 223 will be mainly described as an example, but the present invention is not limited thereto.

Specifically, 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 layer closest to the pixel layer 221 among the plurality of light-blocking layers is referred to as a first light-blocking layer here, that is, 222 in fig. 10 denotes the first light-blocking layer, and 223 may denote any one of the light-blocking layers below the first light-blocking layer, which is referred to as a second light-blocking layer here, wherein the size of the via array of the first light-blocking layer 222 is the smallest among 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 shape 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 all be set to be the same. For another example, the size of the through holes of the same light-blocking layer in the plurality of light-blocking layers may be set to be the same, and the size of the through holes of each light-blocking layer in the plurality of light-blocking layers increases from the first light-blocking layer to the bottom in sequence, that is, 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 lowest light-blocking layer is the largest. For convenience of explanation, the following description and the corresponding drawings take the example that the through holes in the plurality of light-blocking layers are all 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 screen 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; an optically sensitive pixel array 232 is disposed below the microlens array 231, and each of the plurality of light guide channels corresponds to one optically sensitive pixel in the optically sensitive pixel array 232.

The light guide channels are configured to transmit light signals in different directions in the return light signal passing through the finger 210 to the microlens array 231, the microlens array 231 is configured to converge the light signals in different directions to a plurality of optical sensing pixels in the optical sensing pixel array 232, each optical sensing pixel in the optical sensing pixel array 232 is configured to receive the light signal transmitted through the corresponding light guide channel, that is, the optical sensing pixel array 232 is configured to receive the light signals in different directions, and the light signals are used to perform fingerprint identification of the finger.

It should be understood that the electronic device 200 of the embodiment of the present application may be imaged by the microlens array 231. Specifically, fig. 11 shows a schematic diagram of the principle of lens imaging, and as shown in fig. 11, "object" indicates an object side imaged by the lens, and an object on the object side is indicated by an arrow in the vertical direction; "image" means the image side of the lens image with the lens in the middle. As shown in fig. 11, light (in various directions) emitted from each point of an object on the object side is converged again to form a corresponding point through the intermediate lens, and is imaged on the image side.

However, unlike fig. 11, the display screen 220 of the embodiment of the present application has a plurality of light blocking layers disposed therein. Specifically, as shown in fig. 12, the plurality of light-blocking layers correspond to adding a plurality of diaphragms 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 a two-layer diaphragm. At this time, in the imaging process of the lens, the relationship between the object and the image is in one-to-one correspondence, so that the added diaphragm, namely the light blocking layer, can realize optical path selection, 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 can be seen from the optical path shown in fig. 12, since a plurality of light blocking layers are disposed above the lens, only optical signals in certain directions can be converged to the optical sensing pixel array through the lens to pass through. Specifically, for convenience of description, the light guide channels formed by the light blocking layers are grouped below. As shown in fig. 13, for any through hole in the first light-blocking layer 222, the light guide channels passing through the through hole are a group of light guide channels, that is, the same group of light guide channels passes through the same through hole in the first light-blocking layer 222, and the 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, the directions of the different sets of light guide channels are different; if each group of light guide channels comprises a plurality of light guide channels, the directions of the same group of light guide channels are different, but the light guide channels with the same direction can be included in different groups of light guide channels.

Taking two light-blocking layers as shown in fig. 10 or fig. 13 as an example, the same set of light-guiding channels corresponds to one through hole in the first light-blocking layer 222, and the set of light-guiding channels may correspond to one or more through holes in the second light-blocking layer 223, for example, 2, 4, or 9. The following description will be given by taking 4 through holes as an example, and the four through holes correspond to four light guide channels in different directions, but the embodiment of the present application is not limited thereto.

It should be understood that the directions of the same group of light guide channels may be set according to practical applications, for example, the directions may be set to arbitrary values by adjusting the distances between different light blocking layers and the distribution of the through holes in each light blocking layer. 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 through hole 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 optical sensing pixels in the optical sensing pixel array, and all the 4 through holes, the correspondingly formed 4 light guide channels, and the corresponding 4 optical sensing pixels below of the same group of the light-blocking layer 223 may be symmetrically distributed with respect to the small hole of the first light-blocking layer 222. For example, in fig. 13, 4 through holes of the second light-

blocking layer

223 and 4 corresponding photo-sensing pixels therebelow are respectively distributed in a square shape and are symmetrical with respect to the small holes of the first light-blocking layer 222.

It should be understood that by setting the distance between the light-blocking layers and the distribution of the through holes in the light-blocking layers, the angle of each of the optical signals in different directions transmitted by the same set of light guide channels can be set to any value. Specifically, as shown in fig. 13, the included angle between the light signals in four directions passing through the 4 through holes of the second light-blocking layer 223 and the second light-blocking layer 223 may be any value. For example, in the case where four through holes are symmetrical with respect to the through hole of the first light-blocking layer 222, the light signals of the four directions have the same angle with the second light-blocking layer 223. As can be seen from fig. 12, due to the arrangement of the apertures of the through holes in the light-blocking layers, the optical signals transmitted by the through holes are substantially tapered, and the same included 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 four-directional optical signals correspond to four tapers, which are the same as those of the second light-blocking layer 223.

Alternatively, the different optical signals passed by the same group of light-guiding channels may be arranged perpendicular to each other, for example, as shown in fig. 13, the optical signals passed through the four through holes of the second light-blocking layer 223 are arranged at an angle equal to 45 ° with respect 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 can be set according to practical applications. For example, one light guide channel of a plurality of light guide channels formed by a plurality of light blocking layers may correspond to one microlens of the microlens array 231, that is, the light guide channels correspond to the microlenses one by one; for another example, as shown in fig. 13, the same group of light guide channels may also correspond to one microlens in the microlens array 231; for another example, as shown in fig. 10, at least two light guide channels intersecting below the light blocking layers in the light guide channels correspond to one microlens in the microlens array 231, and the embodiment of the present 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 the corresponding light 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 light 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 optically sensitive pixel in the optically sensitive pixel array 232 in the embodiment of the present application is set in relation to the corresponding light guide channel and also in relation to the position of the light path where the micro lenses converge.

It should be understood that the through holes of the plurality of light blocking layers are described above in connection with the perspective view shown in fig. 13; referring to fig. 13, fig. 14 corresponds to a schematic plan view showing through holes of a plurality of light blocking layers. Specifically, as shown in fig. 14, 9 groups 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, i.e. 9 through holes of the first light blocking layer 222 represented by the 9 smallest circles with shading in fig. 14; each of the 9 through holes has a corresponding 4 circles around it to indicate a group of through holes in the second light-blocking layer 223, that is, a 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 from 1 to 4, optical signals in 4 directions in each group can be obtained as shown in fig. 9 corresponding to 4 light-guiding channels.

It should be understood that the optical sensing pixel array 232 of the embodiment of the present application can obtain optical signals in different directions for generating a plurality of fingerprint images, wherein the optical signals in the same direction in the optical signals received by the optical sensing pixel array 232 are used for generating the same fingerprint image. In addition, any one or more of the generated multiple fingerprint images can be used for fingerprint identification, and the difference between different fingerprint images in the multiple 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 that the fingerprint image obtained by the electronic device 200 is suitable for the related description of fig. 9, and is not repeated herein for brevity.

It should be understood that the display screen 220 in the embodiment of the present application has a plurality of light blocking layers, and the display screen 120 has the aperture imaging layer 122 and the light blocking layer 123, except that the description of the display screen 220 is applicable to the description of the display screen 120, and the description is omitted here for brevity.

For example, a fingerprint detection area may be disposed on the display screen 220, and the description of the fingerprint detection area is consistent with that of the fingerprint detection area 124 of the display screen 120, and for brevity, will not be described again.

For another example, as shown in fig. 10 and fig. 2, if the first light-blocking layer 222 in the display screen 220 replaces the aperture imaging layer 122 in the display screen 120 and the second light-blocking layer 223 in the display screen 220 replaces 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 screen 220 may also include: and the multiple inorganic material layers are respectively used for being attached to the upper surface and the lower surface of each light-blocking layer in the plurality of light-blocking layers. The display 220 may further include at least one organic material layer including: the organic material layer is positioned between two inorganic material layers between two adjacent light-blocking layers in the plurality of light-blocking layers, and/or the organic material layer is positioned below the light-blocking layer which is closest to the fingerprint identification device in the plurality of light-blocking layers.

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

In addition, any one of the optical sensing pixels in the optical sensing pixel array 232 in the embodiment of the present application may be similar to any one of the optical sensing pixels in the fingerprint identification device 130, for example, any one of the optical sensing pixels in the optical sensing pixel array 232 may also be a light detector, and for brevity, no further description is provided herein.

Therefore, the electronic device 200 of the embodiment of the present application, through set up a plurality of light blocking layers in order to form the light guide channel of equidirectional in the display screen, and then guide the light signal that has specific direction to transmit to the microlens array in the fingerprint identification device of below, the microlens array assembles the light signal to the optical sensing pixel array that corresponds, make optical sensing pixel array can receive the light signal on the equidirectional, the design of multi-angle light path in the screen has been realized, receive the light of equidirectional one to one, can obtain the complete high quality image of same fingerprint from a plurality of observation angles after handling, can also reduce the thickness of fingerprint identification device or sensitization device by a wide margin simultaneously.

It should be understood that, for the electronic apparatus 100 and the electronic apparatus 200 in the embodiment of the present application, the fingerprint identification device included therein may include other components besides the microlens array and/or the optical sensing pixel array described above. For example, the reading circuit and other auxiliary circuits, which can be electrically connected to the photo sensor pixel array, can be fabricated on a chip (Die) by semiconductor process and the photo sensor pixel array, such as an optical imaging chip or an optical fingerprint sensor. For another example, a Filter layer (Filter) or other optical elements may be further included above the optical sensing pixel array, and the Filter layer or other optical elements are mainly used for isolating the influence of external interference light on the optical fingerprint detection. The filter layer may be configured to filter ambient light penetrating through the finger, the filter layer may be configured to filter interference light for each optical sensing pixel, or a large-area filter layer may be used to cover the optical sensing pixel array.

For the electronic device 200 of the present application, the microlens array 231 and the optically sensitive pixel array 232 may be packaged in the same optical fingerprint component; alternatively, the microlens array 231 may be disposed outside the chip on which the photo sensor pixel array 232 is disposed, for example, attached above the chip on which the photo sensor pixel array 232 is disposed.

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 implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

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

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

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

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

The 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 such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by 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 optical fingerprint identification under the screen, the display screen includes respectively from last to bottom: a pixel layer and a plurality of light-blocking layers,

the pixel layer includes an array of light emitting display pixels for emitting light and illuminating 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, and the size of the through hole array of the first light blocking layer closest to the pixel layer in the plurality of light blocking layers is the smallest;

the fingerprint identification device comprises:

an optical sensing pixel array disposed below the plurality of light blocking layers, each of the plurality of light guide channels corresponding to an optical sensing pixel,

the plurality of light guide channels are used for transmitting light signals in different directions in 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 signal transmitted through the corresponding light guide channel, and the light signal is used for fingerprint identification of the finger.

2. The fingerprint identification device according to claim 1, wherein the array of through holes in the light blocking layers is configured to form a plurality of sets of light guide channels, and one through hole in the first light blocking layer correspondingly forms a set of light guide channels, and the set of light guide channels includes at least two light guide channels with different directions.

3. The fingerprint recognition device of claim 2, wherein each through hole in the first light blocking layer is configured to enable pinhole imaging.

4. The fingerprint recognition device according to claim 2, further comprising:

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

5. The fingerprint recognition device of claim 4, wherein one of the plurality of light-conducting channels corresponds to one of the microlenses in the microlens array.

6. The fingerprint recognition device of claim 4, wherein at least two of the plurality of light-conducting channels that intersect below the plurality of light blocking layers correspond to one of the microlenses in the microlens array.

7. The fingerprint recognition device of claim 4, wherein one of the plurality of sets of light-conducting channels corresponds to one of the microlenses of the microlens array.

8. The fingerprint identification device according to any one of claims 2 to 7, wherein the same group of light guide channels are symmetrically distributed with respect to the corresponding through holes in the first light blocking layer, and the plurality of photo-sensing pixels corresponding to the same group of light guide channels are symmetrically distributed with respect to the corresponding through holes.

9. The fingerprint recognition device of claim 8, wherein each of the plurality of sets of light-conducting channels comprises 4 light-conducting channels, the 4 light-conducting channels corresponding to 4 optically sensitive pixels in the array of optically sensitive pixels.

10. The fingerprint identification device of claim 9, wherein the 4 optical sensing pixels corresponding to the same set 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 the 4 directions of light signals perpendicular to each other.

12. The fingerprint recognition device according to any one of claims 1 to 7, wherein the through holes of the same light-blocking layer among the plurality of light-blocking layers have the same shape.

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

14. The fingerprint recognition device according to claim 12, wherein the size of the through holes of the same light-blocking layer of the plurality of light-blocking layers is the same, and the size of the through holes of each light-blocking layer of the plurality of light-blocking layers increases sequentially from the first light-blocking layer downward.

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

16. The fingerprint identification device according to claim 14, wherein the diameter of the through holes in the light-blocking layers except the first light-blocking layer among the plurality of light-blocking layers ranges from 5 μm to 10 μm.

17. A display screen, comprising: a pixel layer and a plurality of light-blocking layers,

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 the first light blocking layer closest 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 a fingerprint identification device, and the optical signals are used for fingerprint identification of the finger.

18. The display screen of claim 17, further comprising: a plurality of layers of inorganic material, wherein,

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

19. The display screen of claim 18, further comprising at least one layer of organic material,

the at least one organic material layer includes:

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

and the organic material layer is positioned below the light-blocking layer closest to the fingerprint identification device in the plurality of light-blocking layers.

20. A display screen according to any one of claims 17 to 19, wherein the array of through holes in the plurality of light blocking layers is configured to form a plurality of sets of light guide channels, and one through hole in the first light blocking layer correspondingly forms a set of light guide channels, and the set of light guide channels includes at least two light guide channels with different directions.

21. A display screen according to claim 20, wherein the same set of light-conducting channels are symmetrically distributed with respect to the corresponding through holes in the first light barrier layer.

22. A display screen according to claim 21, wherein each of the light guide channels in the plurality of groups of light guide channels comprises 4 light guide channels, the through holes in each light blocking layer belonging to the same group of light guide channels are distributed in a square shape, and the directions of the 4 light guide channels are perpendicular to each other.

23. A display screen according to any one of claims 17 to 19, wherein the through holes of the same light-blocking layer of the plurality of light-blocking layers are identical in shape.

24. A display screen according to claim 23, wherein all of the through holes in the plurality of light blocking layers are the same shape and are circular.

25. A display screen according to claim 23, wherein the through holes of the same light-blocking layer in the plurality of light-blocking layers have the same size, and the size of the through holes of each light-blocking layer in the plurality of light-blocking layers increases sequentially from the first light-blocking layer downward.

26. A display screen as recited in claim 25, wherein the apertures in the first light blocking layer have a diameter of less than or equal to 5 μm.

27. The display screen of claim 25, wherein the diameter of the through holes in the light-blocking layers except the first light-blocking layer in the plurality of light-blocking layers ranges from 5 μm to 10 μm.

28. The display screen of any one of claims 17 to 19, further comprising: and the cover plate is positioned above the pixel layer and used for protecting the pixel layer.

29. The display screen of any one of claims 17 to 19, further comprising: a circuit layer between the pixel layer and the first light blocking layer.

30. An electronic device, comprising:

the fingerprint recognition device according to any one of claims 1 to 16; and

a display screen according to any one of claims 17 to 29, the fingerprint recognition device being located below the display screen.

31. The electronic device of claim 30, further comprising: a processing unit to:

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

and performing fingerprint identification on the finger according to the plurality of fingerprint images.