WO2021174423A1

WO2021174423A1 - Fingerprint recognition apparatus, display screen, and electronic device

Info

Publication number: WO2021174423A1
Application number: PCT/CN2020/077648
Authority: WO
Inventors: 宋锐男; 张玮; 王炳文; 王磊; 李顺展
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2021-09-10
Also published as: CN111788577B; CN111788577A

Abstract

The embodiments of the present application relate to a fingerprint recognition apparatus, a display screen and an electronic device, which can reduce the thickness of the fingerprint recognition apparatus while implementing reception of multi-angle optical signals. The display screen respectively comprises, from top to bottom: a pixel layer where a light-emitting display pixel array is located and a plurality of light-blocking layers, each light-blocking layer being provided with a through-hole array, so as to form a plurality of light guide channels in different directions. The fingerprint recognition apparatus comprises: an optical sensing pixel array provided below the plurality of light-blocking layers, each light guide channel among the plurality of light guide channels corresponding to one optical sensing pixel, the plurality of light guide channels being used for transmitting, to the plurality of optical sensing pixels in the optical sensing pixel array, light signals in different directions among the light signals returned by a finger, each optical sensing pixel being used for receiving the optical signals transmitted through corresponding light guide channels, and the optical signal being used for performing fingerprint recognition of the finger.

Description

Fingerprint identification device, display screen and electronic equipment

Technical field

This application relates to the field of biometric identification, and in particular to fingerprint identification devices, display screens and electronic equipment.

Background technique

The under-screen optical fingerprint system has been mass-produced in electronic products such as smart phones. At present, the principle of fingerprint recognition under most screens is to illuminate finger fingerprints by using the self-luminescence of the screen. After the reflected light of the finger passes through the screen, it is collected and recognized by the photoelectric detection equipment under the screen.

In order to increase the identification area of the fingerprint signal and receive more fingerprint information, a complex optical path is usually designed inside the fingerprint device under the screen, so that it can receive multi-angle light and can be used for more advanced functions such as anti-counterfeiting. However, this complicated optical path will make the fingerprint device under the screen thicker, which does not conform to the trend of thinner and thinner fingerprints under the screen in the future.

Summary of the invention

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

In the first aspect, a fingerprint recognition device is provided, which is suitable for under the display screen to realize under-screen optical fingerprint recognition. The display screen includes, from top to bottom, a pixel layer and a plurality of light-blocking layers. The pixel layer It includes a light-emitting display pixel array, the light-emitting display pixel array is used to emit light and illuminate a finger, each light-blocking layer of the plurality of light-blocking layers has an array of through holes to form a plurality of light-guiding channels in different directions, the The size of the through hole array of the first light-blocking layer closest to the pixel layer among the plurality of light-blocking layers has the smallest size; the fingerprint identification device includes: an optical sensing pixel array arranged under the plurality of light-blocking layers, Each light guide channel of the plurality of light guide channels corresponds to an optical sensing pixel, wherein the plurality of light guide channels are used to transmit light signals in different directions among the return light signals passing through the finger to all the light guide channels. A plurality of optical sensing pixels in the optical sensing pixel array, each optical sensing pixel in the optical sensing pixel array is used to receive an optical signal transmitted through a corresponding light guide channel, and the optical signal is used to perform the finger Fingerprint recognition.

Therefore, the fingerprint identification device of the embodiment of the present application is arranged below the display screen, and multiple light-blocking layers are arranged in the display screen to form light guide channels in different directions, thereby guiding light signals with specific directions to be transmitted to the lower part. The optical sensing pixel array in the fingerprint identification device enables the optical sensing pixel array to receive light signals in different directions, and realizes the multi-angle optical path design in the screen. It receives light from different directions one to one, and the same one can be obtained after processing. The fingerprint is a complete high-quality image from multiple viewing angles, and at the same time, the thickness of the fingerprint identification device or the photosensitive device can be greatly reduced.

With reference to the first aspect, in an implementation 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 sensing pixel array receives more than one fingerprint image. The light signals in each direction are respectively used to generate multiple fingerprint images.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the difference between at least two fingerprint images in the plurality of fingerprint images is used for fingerprint anti-counterfeiting authentication of the finger.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the through hole arrays in the plurality of light blocking layers are used to form multiple groups of light guide channels, and the first light blocking layer One of the through holes 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.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, each through hole in the first light blocking layer is used to realize small hole imaging.

In this case, the multiple light-blocking layers provided in the display screen include a light-blocking layer that can be used for small-hole imaging, and at least one other light-blocking layer. After imaging is performed using the principle of small-hole imaging , Can guide the light signal with a specific direction to be transmitted to the optical sensing pixel array in the fingerprint recognition device below, so that the optical sensing pixel array can receive light signals in different directions, and realize the multi-angle optical path design in the screen.

Combining the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the fingerprint identification device further includes: a microlens array disposed on the plurality of light blocking layers and the optical sensing pixel array Among them, it is used to converge light signals in different directions passing through the plurality of light guide channels to the plurality of optical sensing pixels in the optical sensing pixel array, respectively.

In this case, by providing multiple light-blocking layers in the display screen to form light guide channels in different directions, and then guide the light signal with a specific direction to be transmitted to the microlens array in the fingerprint recognition device below, the microlens array The optical signal is converged to the corresponding optical sensor pixel array, that is, imaging is performed by the principle of microlens imaging, and the optical sensor pixel array can receive light signals in different directions, realizing the multi-angle optical path design in the screen.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, one light guide channel in the plurality of light guide channels corresponds to one microlens in the microlens array.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, at least two of the plurality of light guide channels intersecting under the plurality of light blocking layers correspond to the A microlens in a microlens array.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, one group of light guide channels in the plurality of groups of light guide channels corresponds to one microlens in the microlens array.

In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, 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 same group The plurality of optical sensing pixels corresponding to the light guide channel are symmetrically distributed with respect to the corresponding through hole.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, each group of light guide channels in the plurality of groups of light guide channels includes 4 light guide channels, and the 4 light guide channels Corresponding to the 4 optical sensing pixels in the optical sensing pixel array.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the four 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 manners, in another implementation manner of the first aspect, the optical signals in the four directions received by the four optical sensing pixels are perpendicular to each other.

In combination with the first aspect and the foregoing implementation manners 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.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, all the through holes in the plurality of light blocking layers have the same shape and are all circular.

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the size of the through hole of the same light-blocking layer in the plurality of light-blocking layers is the same, and each of the plurality of light-blocking layers The size of the through holes of each light-blocking layer gradually increases from the first light-blocking layer downward.

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

In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the diameter of the through holes in the light-blocking layers other than the first light-blocking layer in the plurality of light-blocking layers is selected The value range is 5μm-10μm.

In a second aspect, a display screen is provided, including: a pixel layer and a plurality of light-blocking layers, the pixel layer includes a light-emitting display pixel array, the light-emitting display pixel array is used to emit light and illuminate a finger, and the multiple blocking layers Each light blocking layer in the light blocking layer has a through hole array 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 At a minimum, the multiple light guide channels are used to respectively transmit light signals in different directions in the return light signal passing through the finger to the fingerprint identification device, and the light signal is used to perform fingerprint identification of the finger.

Therefore, in the display screen of the embodiment of the present application, a plurality of light blocking layers are provided to form light guide channels in different directions, so as to guide light signals with specific directions to be transmitted to the corresponding optical sensing pixel array in the fingerprint recognition device below. , Enables the optical sensor pixel array to receive light signals in different directions, realizes the multi-angle optical path design in the screen, and receives light in different directions one to one. After processing, the same fingerprint can be obtained from multiple viewing angles. Quality images can also greatly reduce the thickness of the fingerprint identification device or photosensitive device.

With reference to the second aspect, in an implementation of the second aspect, the display screen further includes: a multilayer inorganic material layer, and the multilayer inorganic material layer is used to interact with each of the plurality of light blocking layers. The upper surface of the light-blocking layer is bonded together, and is also used for bonding with the lower surface of each light-blocking layer.

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

In combination with the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the through hole arrays in the plurality of light blocking layers are used to form multiple groups of light guide channels, and the first light blocking layer One of the through holes 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.

In combination with the second aspect and the foregoing implementation manners, 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 manners of the second aspect, in another implementation manner of the second aspect, each group of light guide channels in the plurality of groups of light guide channels includes 4 light guide channels.

In combination with the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the through holes belonging to the same group of light guide channels in each light blocking layer are distributed in a square shape.

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

In combination with the second aspect and the foregoing implementation manners 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.

In combination with the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, all the through holes in the plurality of light blocking layers have the same shape.

In combination with the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the shape of all the through holes in the plurality of light blocking layers is circular.

In combination with the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the sizes of the through holes of the same light-blocking layer in the plurality of light-blocking layers are the same.

In combination with the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the size of the through hole of each light-blocking layer in the plurality of light-blocking layers is downward from the first light-blocking layer Increase sequentially.

In combination with the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the diameter of the small holes in the first light blocking layer is less than or equal to 5 μm.

In combination with the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the diameter of the through holes in the light-blocking layers other than the first light-blocking layer in the plurality of light-blocking layers is selected The value range is 5μm-10μm.

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

Combining the second aspect and the foregoing implementation manners thereof, in another implementation manner of the second aspect, the display screen further includes: a circuit layer located between the pixel layer and the first light blocking layer between.

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

Therefore, in the electronic device of the embodiment of the present application, multiple light-blocking layers are provided in the display screen to form light guide channels in different directions, thereby guiding the light signal with a specific direction to be transmitted to the corresponding optical signal in the fingerprint recognition device below. The sensor pixel array enables the optical sensor pixel array to receive light signals in different directions, and realizes the multi-angle light path design in the screen. It receives light from different directions one to one. After processing, the same fingerprint can be obtained from multiple viewing angles. Complete high-quality images, while also greatly reducing the thickness of the fingerprint identification device or photosensitive device.

With reference to the third aspect, in an implementation of the third aspect, the processing unit is configured to: generate multiple fingerprint images according to the optical signals received by the optical sensing pixel array in multiple directions; Fingerprint image, fingerprint recognition of the finger.

In combination with the third aspect and the foregoing implementation manners of the third aspect, in another implementation manner of the third aspect, the processing unit is configured to: the optical signals in the multiple directions received by the optical sensing pixel array are in the same direction. The optical signal generates the same fingerprint image.

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

Description of the drawings

Figure 1 is a schematic diagram of the fingerprint recognition module under the screen.

Fig. 2 is a side view of an electronic device with an under-screen fingerprint identification device according to an embodiment of the present application.

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

Figure 4 is a schematic diagram of the principle of small hole imaging.

Fig. 5 is a schematic diagram of the principle of small hole imaging according to an embodiment of the present application.

Fig. 6 is a three-dimensional schematic diagram of the corresponding relationship between a small hole and a plurality of through holes according to an embodiment of the present application.

FIG. 7 is a schematic plan view of the corresponding 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 the display screen in the electronic device shown in Fig. 2.

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

Fig. 10 is a side view of another electronic device with an under-screen fingerprint identification device 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 three-dimensional schematic diagram of the corresponding relationship among a plurality of light blocking layers, a microlens array, and an optical sensing pixel array according to an embodiment of the present application.

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

Detailed ways

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

The technical solutions of the embodiments of the present application can be applied to various electronic devices. For example, portable or mobile computing devices such as smartphones, notebook computers, tablet computers, and gaming devices, as well as other electronic devices such as electronic databases, automobiles, and bank automated teller machines (ATM). However, the embodiment of the present application does not limit this.

The technical solutions of the embodiments of the present application can be used in biometric identification technology. Among them, biometric recognition technologies include, but are not limited to, fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition. For ease of description, the following uses fingerprint recognition technology as an example for description.

The technical solutions of the embodiments of the present application can be used in the under-screen fingerprint identification technology. The under-screen fingerprint recognition technology refers to the installation of the fingerprint recognition module below the display screen, so as to realize the fingerprint recognition operation in the display area of the display screen. There is no need to set a fingerprint collection area on the front of the electronic device except for the display area. Specifically, the fingerprint identification module uses light returned from the top surface of the display assembly of the electronic device to perform fingerprint sensing and other sensing operations. This returned light carries information about objects (such as fingers) that are in contact with or close to the top surface of the display assembly, and the fingerprint recognition module located under the display assembly collects and detects this returned light to realize fingerprint recognition under the screen. Among them, the design of the fingerprint recognition module may be to realize the desired optical imaging by appropriately configuring the optical element for collecting and detecting the returned light, so as to detect the fingerprint information of the finger.

In order to increase the identification area of the fingerprint signal and receive more fingerprint information, a complex optical path is usually designed inside the fingerprint device under the screen, so that it can receive multi-angle light and can be used for more advanced functions such as anti-counterfeiting. For example, in order to be able to receive light from multiple angles, an under-screen fingerprint recognition module as shown in Figure 1 can be used. This fingerprint recognition module can also be called an external sensor. The position of the diaphragm, and then design the optical path.

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 recognition module also includes a multi-layer diaphragm. For example, in Fig. 1, a two-layer diaphragm is taken as an example, namely, diaphragm 1 and diaphragm 2. The multi-layer diaphragm is located below the lens layer, and the multi-layer diaphragm can Multiple light guide channels in multiple directions are formed to facilitate receiving oblique optical signals. An optical path medium can also be arranged between the multi-layer diaphragms, for example, three optical path medium layers as shown in FIG. 1, namely, optical path medium 1-3, wherein the materials of different optical path medium layers may be the same or different. In addition, under the multi-layer diaphragm, the fingerprint recognition module also includes a photosensitive device for receiving light signals in multiple directions transmitted through the light guide in the multi-layer diaphragm. These optical signals in different directions can be used. For fingerprint identification.

As shown in Figure 1, the external sensor under the screen can select a light path with a specified angle of incidence to project onto the photosensitive device by reasonably setting the lens and diaphragm, but the lens and diaphragm under this design will occupy the Most of the space of the Sensor, which makes the fingerprint device under the screen thicker, does not conform to the trend of thinner and thinner fingerprints under the screen in the future.

Therefore, in order to solve the above-mentioned problem and shorten the optical path of the system, the embodiments of the present application provide a variety of fingerprint identification devices and electronic devices.

Fig. 2 shows a partial side view of an electronic device 100 according to an embodiment of the present 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 under-screen optical fingerprint identification. In addition, as shown in FIG. 2, "110" above the display screen 120 represents an object of fingerprint recognition. For example, when a user performs fingerprint recognition, a finger 110 touches the upper surface of the display screen 120.

It should be understood that the display screen 120 in the embodiment of the present application may be a self-luminous display, which uses a self-luminous display unit as a display pixel. 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 screen 120 may also be a liquid crystal display (LCD) or other passive light-emitting display, which is not limited in the embodiment of the present application. For ease of description, the following description takes the display screen 120 as an OLED screen as an example, that is, as shown in FIG. 2, the display screen 120 includes a pixel layer 121, and the pixel layer 121 includes a light emitting display pixel array. It emits light to display an image. In addition, during fingerprint recognition, the light-emitting display pixel can also be used as a light source, capable of emitting light and illuminating the finger 110, thereby generating a returning light signal through the finger 110.

Specifically, the fingerprint identification device 130 may use the light-emitting display pixels (ie, OLED light source) 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 on the fingerprint detection area 124, the display screen 120 emits a beam of light to the target finger 110 above the fingerprint detection area 124. The light is reflected on the surface of the finger 110 to form reflected light or passes through the finger. The 110 internally scatters to form scattered light (transmitted light). For ease of description, the above-mentioned reflected light and scattered light are collectively referred to as return light. Since the ridge and valley of the fingerprint have different light reflection capabilities, the return light from the fingerprint ridge and the return light from the fingerprint valley have different light intensities, and the return light is transmitted and finally received by the fingerprint identification device 130. The optical sensing pixel array in the optical sensing pixel array receives and converts it into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby realizing optical fingerprint recognition in the electronic device 100 Function.

In other alternatives, the fingerprint identification device 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the fingerprint identification device 130 can be applied not only to self-luminous displays such as OLED displays, but also to non-self-luminous displays, such as liquid crystal displays or other passive light-emitting displays. The embodiment of the present application It is not limited to this.

Further, the display screen 120 may also be specifically a touch-sensitive display screen, which can not only perform screen display, but also detect a user's touch or pressing operation, so as to provide the user with a human-computer interaction interface. For example, in an embodiment, the electronic device 100 may include a touch sensor, and the touch sensor may specifically be a touch panel (TP), which may be provided on the surface of the display screen 120, or may be partially integrated or The whole is integrated into the display screen 120 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 its sensing area is the sensing area of the fingerprint identification device 130, which corresponds to the image on the display screen 120 Fingerprint detection area (also called fingerprint collection area, fingerprint recognition area, etc.). For example, each optical sensing pixel in the optical sensing pixel array may be a photodetector, that is, the optical sensing pixel array may specifically be a photodetector (Photodetector) array, which includes a plurality of photodetectors distributed in an array. Wherein, the fingerprint identification device 130 can be arranged in a partial area below the display screen 120.

The aforementioned fingerprint detection area is located in the display area of the display screen 120. Depending on the setting of the light path, the corresponding sensing area of the fingerprint identification device 130 may or may not be located directly below the fingerprint detection area of the display screen 120. In addition, due to the different optical path settings, in some embodiments of the present application, the range of the area where the optical sensing pixel array of the fingerprint identification device 130 is located or the range of the sensing area of the fingerprint identification device 130 is different from the fingerprint detection on the display screen 120. The range of the area (or the fingerprint detection area corresponding to the fingerprint identification device 130) may be equal or unequal, which is not specifically limited in the embodiment of the present application. For example, through a reflective folding light path design or other light design, the area of the sensing area of the fingerprint identification device 130 can be larger than the area of the fingerprint detection area on the display screen 120.

It should be understood that the fingerprint detection area range in the display screen 120 of the embodiment of the present application can be set according to actual applications, and can be set to any size. For example, as shown in FIG. 3, the fingerprint detection area in the display screen 120 of the embodiment of the present application is marked as 124 here. Optionally, as shown in the left image of FIG. 3, the fingerprint detection area 124 of the display screen 120 may be small in area and fixed in position. Therefore, the user needs to press the finger 110 to the fingerprint detection area 124 when performing fingerprint input. Specific location, otherwise the fingerprint identification device 130 may not be able to collect fingerprint images, resulting in poor user experience. In this case, the fingerprint detection area 124 can usually be set as a square with a side length of 2.5-3 cm, so that the fingerprint information can be fully received, but the specific size can be set according to the actual screen size and mass production conditions.

Optionally, as shown in the middle or right diagram of FIG. 3, the display screen 120 can also be designed as a half-screen fingerprint recognition screen and a full-screen fingerprint recognition screen, that is to say, the fingerprint detection area 124 can occupy half or most of the display screen 120. Or all. For example, a fingerprint identification device can be provided, and the fingerprint identification device includes a sufficient number of optical sensing pixels to increase the range of the fingerprint detection area 124. For another example, a plurality of fingerprint identification devices may be arranged side by side under the display screen 120 through a splicing method, and the sensing areas of the plurality of fingerprint identification devices jointly constitute the sensing area of the electronic device 100. The area corresponds to the fingerprint detection area 124 of the display screen 120, so that the fingerprint detection area 124 can be extended to the main area of the lower half of the display screen 120, for example, extended to the area where the finger 110 is habitually pressed, or extended to the half screen to set the full screen. Realize the blind fingerprint input operation.

For the electronic device 100, when the user needs to unlock the electronic device 100 or perform other fingerprint verification, only the finger 110 needs to be pressed on the fingerprint detection area 124 of the display screen 120 to realize fingerprint input. Because fingerprint detection can be implemented in the screen, the electronic device 100 with the above structure does not need to reserve space on the front side to set the fingerprint button (such as the Home button), so that a full-screen solution can be adopted, that is, the display area of the display screen 120 can be basically Extend to the front of the entire 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, in which, in addition to the aforementioned pixel layer 121, other structures are also included. Specifically, the display screen 120 includes a pixel layer 121 and a plurality of light blocking layers 122 and 123 from the upper layer to the lower layer, respectively.

For the multiple light-blocking layers, two or more light-blocking layers may be included. Considering the thickness of the display screen 120, two or three light-blocking layers may be generally provided. For example, as shown in FIG. 2, the following mainly refers to The two light-blocking

layers

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

Specifically, each light-blocking layer of the plurality of light-blocking layers has an array of through holes to form a plurality of light-guiding channels in different directions; wherein, the light-blocking layer of the plurality of light-blocking layers closest to the pixel layer 121 blocks light The size of the through hole of the layer is usually set to the smallest. Correspondingly, as shown in FIG. 2, for the fingerprint identification device 130 under the display screen 120, it includes an optical sensing pixel array, which is arranged under the display screen 120, that is, is arranged on the plurality of light blocking layers 122 and 123. Below, each of the plurality of light guide channels formed by the plurality of light blocking layers 122 and 123 corresponds to an optical sensing pixel. In this way, the multiple light guide channels can transmit light signals in different directions in the return light signal passing through the upper finger 110 to multiple optical sensing pixels in the optical sensing pixel array, and each optical sensing pixel is used to receive The optical signal transmitted through the corresponding light guide channel is used for fingerprint recognition of the finger 110.

Optionally, considering different imaging principles, the arrangement of multiple light blocking layers in the display screen 120 may be different, and the fingerprint identification device 130 may also be different. For example, the fingerprint image can be obtained by the principle of small hole imaging, or the fingerprint image can also be obtained by the principle of lens imaging, which will be described below in conjunction with different embodiments.

In the case of imaging using the principle of small hole imaging, the through hole of any one of the multiple light blocking layers can be set to be used for small hole imaging. For ease of description, one of the multiple light-blocking layers used for small hole imaging is referred to herein as the small hole imaging layer, and the other layers are still called light-blocking layers. For example, the light blocking layer closest to the pixel layer 121 among the plurality of light blocking layers may be set as the pinhole imaging layer, as shown in FIG. 2, that is, the plurality of light blocking layers 122 and 123 include the pinhole imaging layer 122 And light blocking layer 123. The small aperture imaging layer 122 and the light blocking layer 123 will be described in detail below.

For the small hole imaging layer 122, the small hole imaging layer 122 includes a small hole array, and each small hole in the small hole imaging layer 122 can realize small hole imaging, that is, after light irradiates the finger 110, it can be realized through each small hole Small hole imaging.

Optionally, the shape of each small hole in the small hole imaging layer 122 in the embodiment of the present application may be the same or different, for example, it may be set to be a circle, a square, or a triangle. In addition, the size of each small hole in the small hole imaging layer 122 may also be the same or different, and the size of each small hole may be set according to actual applications, for example, determined according to the structure of the screen and the light path. Generally, the smaller the aperture of the aperture imaging layer 122, the higher the resolution, but the smaller the transmitted light intensity. If the aperture is too small, the light will be diffracted. For example, in order to meet the requirement of small hole imaging, taking a circular hole as an example, the diameter of each small hole in the small hole imaging layer 122 can usually be set in a range less than or equal to 5 μm. For ease of description, the various embodiments of the present application and the corresponding drawings take the small hole array 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 a through hole array, and the through hole array can be regarded as including a plurality of sets of through holes, and each small hole in the small hole imaging layer 122 corresponds to the plurality of sets of through holes. Each group of through holes in the group of through holes includes a plurality of through holes. In this way, as shown in FIG. 2, for any small hole in the small hole imaging layer 122, there are a plurality of through holes corresponding to it, and each through hole of the plurality of through holes can pass through a specific direction with the small hole. The optical signal of each group of through holes and corresponding small holes can transmit optical signals in multiple directions in the return optical signal to the fingerprint identification device 130 below, wherein the multiple directions are each small hole and the corresponding small hole. The connection direction between the multiple through holes.

Optionally, the light blocking layer 123 in the embodiment of the present application may be provided with one layer or multiple layers. For example, considering the thickness of the display screen, as shown in FIG. 2, the light blocking layer 123 may be provided with only one layer. For another example, the light blocking layer 123 can also be provided with two or more layers. In this case, the light blocking layer 123 with multiple layers can form a light guide channel, and the direction of the light guide channel can be set according to the light path so as to pass through the small hole. The optical signals in different directions in the returned optical signals after imaging are transmitted to the fingerprint identification device 130 below. For ease of description, in the following and in the corresponding drawings, a layer of light blocking layer 123 is mainly used for description, but the embodiment of the present application is not limited thereto.

Optionally, 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 light blocking layer 123 of the same layer may be set to be the same. The shape of the through hole in the light blocking layer 123 can be set to any shape according to actual applications, for example, it can be set to a circle, a square, a triangle, or the like. For ease of description, the present application takes as an example that all the through holes included in the light blocking layer 123 are circular.

Optionally, the size of the through hole of the light blocking layer 123 can be set to any value according to actual applications. For example, the size of the through hole of the light blocking layer 123 is usually set to be larger than the size of the small hole in the small hole imaging layer 122. For example, the diameter of the circular through hole in the light blocking layer 123 may 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 small hole in the small hole imaging layer 122 may be set to have the same size, or All the through holes in the light blocking layer 123 can be set to the same size. For ease of description, the following description will be given by taking the same size of all the through holes in the light blocking layer 123 as an example.

Correspondingly, as shown in FIG. 2, for the fingerprint identification device 130 under the display screen 120, it includes an optical sensing pixel array, which is arranged under the light blocking layer 123, and each through hole in the light blocking layer 123 Corresponds to an optical sensor pixel. Wherein, each small hole in the small hole imaging layer 122 is used to project the light signal returning after passing through the finger 110 to the light blocking layer 123; a set of through holes corresponding to each small hole is used for the returning light The optical signals in multiple directions in the signal are respectively transmitted to the plurality of optical sensing pixels in the optical sensing pixel array, and each optical sensing pixel in the optical sensing pixel array is used to receive the optical signal transmitted through the corresponding through hole. That is, multiple optical sensing pixel arrays corresponding to the same set of through holes are used to receive light signals in different directions; the light signals are used to perform fingerprint recognition of the finger.

In the embodiment of the present application, each small hole in the small hole imaging layer 122 can realize small hole imaging. Specifically, FIG. 4 shows a schematic diagram of the principle of small hole imaging. As shown in FIG. 4, "object" represents the object side of the small hole imaging, "image" represents the image side of the small hole imaging, and the middle is the small hole. One beam of light emitted from each point of the object on the object side can be projected to the image side through the small hole in the middle to form an image, which is the same as the object on the object side.

However, unlike FIG. 4, a light blocking layer 123 is provided under the small aperture imaging layer 122 in the display screen 120 of the embodiment of the present application. Specifically, as shown in FIG. 5, the light blocking layer 123 is equivalent to adding a diaphragm between the middle aperture and the image side shown in FIG. The black indicates the diaphragm. At this time, since the relationship between the object and the image is one-to-one in the process of small aperture imaging, the increased diaphragm, that is, the light-blocking layer 123, can achieve optical path selection, so that only light signals in certain directions can be transmitted to On the image side, other light signals will be blocked by the light blocking layer 123.

It should be understood that according to the light path shown in FIG. 5, since the light blocking layer 123 is provided under the small aperture imaging layer 122, only light signals in certain directions can pass. Specifically, as shown in FIG. 6, for any small hole in the small hole imaging layer 122, the small hole corresponds to a group of through holes in the light blocking layer 123, and the group of through holes may include at least two through holes. The holes, for example, may include 2, 4, or 9 holes, etc., and only 4 holes are used as an example for illustration, that is, the 4 through holes numbered 1-4 as shown in FIG. 6, but the embodiments of the present application do not Not limited to this.

Optionally, the relative positions of a group of through holes and corresponding small holes can be set according to actual applications, and can be set at any position. Generally, a group of through holes can be arranged symmetrically. For example, as shown in FIG. 6, a group of through holes can be arranged symmetrically with respect to the corresponding small holes, that is, the through holes 1 in FIG. 6 are arranged symmetrically with respect to the small holes. The small hole of the imaging layer 122 is symmetrical with the through hole 4, and the through hole 2 is symmetrical with respect to the small hole of the small hole imaging layer 122 and the through hole 3; or, the four through holes are symmetrical with respect to the small hole of the small hole imaging layer 122. That is to say, the four through holes are distributed in a square shape on the light blocking layer 123. Hereinafter, the four through holes shown in FIG. 6 are described as examples with respect to the small holes of the small hole imaging layer 122, but the embodiment of the present application is not limited thereto.

It should be understood that by setting the distance between the small hole imaging layer 122 and the light blocking layer 123, and setting the distribution of the through holes in the light blocking layer 123, light signals passing through the same small hole and a group of through holes in multiple directions The angle of each light signal can be set to any value. Specifically, as shown in FIG. 6, the angles between the light signals passing through the four directions of the through holes 1-4 and the light blocking layer 123 can be any value. For example, in the case where the four through holes are symmetrical with respect to the small holes of the small hole imaging layer 122, the angles between the optical signals in the four directions and the light blocking layer 123 are the same. Wherein, referring to FIG. 5, it can be seen that due to the setting of the aperture of the through hole in the light blocking layer 123, the optical signal transmitted by it is roughly tapered. Therefore, the optical signal transmitted by the four through holes and the light blocking layer as shown in FIG. The same included angle between 123 means that the light signals in the four directions correspond to four cones, and the included angles between the four cones and the light blocking layer 123 are the same.

Optionally, different optical signals transmitted by a group of through holes corresponding to the same small hole can be set to be perpendicular to each other. For example, as shown in FIG. The included angle of is equal to 45°. At this time, the optical signals in the four directions are perpendicular to each other.

It should be understood that the above described the small holes of the small hole imaging layer 122 and the through holes of the light blocking layer 123 in conjunction with the three-dimensional view shown in FIG. 6; referring to FIG. 6, FIG. 7 correspondingly shows the small holes of the small hole imaging layer 122 A schematic plan view of the hole and the through hole of the light blocking layer 123. Specifically, as shown in FIG. 7, 9 boxes are divided here, and each box can be regarded as an identification area or identification unit, and each box can correspond to one of the fingerprint detection areas 124 shown in FIG. 3. Small squares; for the 9 boxes, FIG. 7 also shows the 9 adjacent small holes in the small hole imaging layer 122, that is, the 9 smallest circles shaded in FIG. 7; each small hole Correspondingly, the surrounding 4 circles represent a group of through holes in the light blocking layer 123, which corresponds to a group of 4 through holes shown in FIG. 6; in addition, FIG. 7 also includes 9 large circles, which represent the small hole imaging layer 122 The range of the image after imaging the small hole of the finger. Since the light blocking layer 123 is provided, 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, since the small aperture imaging layer 122 and the light blocking layer 123 are provided, most of the stray light is basically filtered after passing through these two layers, which also effectively reduces the background noise caused by the stray light. In addition, in order to prevent the optical paths between the small holes in the adjacent boxes as shown in FIG. 7 from interfering with each other, the width between the identification areas represented by the adjacent boxes can meet the requirements of the completeness and resolution of the received signal. As large as possible under the premise.

It should be understood that each optical sensing pixel in the embodiment of the present application corresponds to a through hole in the light blocking layer 123, and each optical sensing pixel is arranged on the light path formed by the corresponding small hole and the through hole, so that the same group of The multiple optical sensing pixel arrays of the through holes can receive light signals in multiple directions, and the multiple directions are the connection directions between each small hole and the corresponding multiple through holes. For example, FIG. 8 shows another side view of the electronic device 100, which corresponds to FIG. 2, and FIG. 8 mainly shows a side view of the display screen 120. As shown in FIG. 2 or FIG. 8, the four dashed lines with arrows indicate optical signals in two different directions, and each direction is the difference between a small hole in the small hole imaging layer 122 and a through hole in the light blocking layer 123. The position indicated by the arrow corresponds to the optical sensing pixel array.

Specifically, since each optical sensing pixel is arranged on the light path formed by the corresponding small hole and the through hole, the distribution of the multiple optical sensing pixels corresponding to the multiple through holes in the same group is similar to the corresponding through hole. For example, when a group of through holes corresponding to a small hole includes 4 through holes, the 4 through holes correspond to 4 optical sensing pixels in the optical sensing pixel array, and the 4 optical sensing pixels are used to receive 4 Light signal in two directions. For another example, in the case where multiple through holes in the same group are symmetrically distributed with respect to the corresponding small holes, then the multiple optical sensing pixels corresponding to the multiple through holes in the same group are also distributed symmetrically with respect to the corresponding small holes, for example, The four through holes included in the same group of through holes are distributed in a square on the light blocking layer 123, so the corresponding four optical sensing pixels are also distributed in a square on the sensing plane.

It should be understood that, as shown in FIG. 8, the four regions A, B, C, and D in the finger 110 are formed by the four regions a, b, c, and d after imaging through the small holes and the transmission of the through holes in the light blocking layer 123. Optical sensing pixel reception. That is to say, the light signal is finally emitted from the bottom layer of the display screen 120 and received by the corresponding optical sensor pixel. According to the size of the optical sensor pixel, assuming that its width is a, b, c, and d, that is, the output of the optical signal The widths are a, b, c, and d; correspondingly, the received fingerprint image range is A, B, C, and D, then the system needs to reasonably set the thickness and distance of each structural layer in the display screen 120, and the small hole imaging layer The spacing and size of the small holes in 122, the size and distance of the through holes in the light blocking layer 123, etc., so that a, b, c, and d cannot overlap each other, and there is no omission between A, B, C, and D The fingerprint images of A, B, C, and D can overlap each other.

In the embodiment of the present application, the display screen 120 may also include other structural layers. For example, the display screen 120 may also include multiple layers of inorganic materials. Since the small hole imaging layer 122 and the light blocking layer 123 are usually made of opaque metal materials, they are better combined with the inorganic layer, and the upper surface and/or the bottom surface of the small hole imaging layer 122 can be inorganic The material layer, which is attached to the upper surface and/or the lower surface of the light blocking layer 123, may also be an inorganic material layer.

For another example, the display screen 120 may also include at least one organic material layer. For example, an organic material layer may be provided between the inorganic material layer below the small aperture imaging layer 122 and the inorganic material layer above the light blocking layer 123. , And/or, the bottom layer of the display screen 120 may be an organic material layer, for example, the bottom layer may be under the inorganic material layer under the light blocking layer 123. It should be understood that the organic layer is inherent to the flexible screen, and its thickness is specified within a certain range according to the screen structure, and its thickness can be adjusted within this range to adjust the optical path structure; if it is a rigid screen without an organic layer, it can be adjusted by adjusting the inorganic layer The thickness of the light path can be adjusted.

Specifically, taking the display screen 120 shown in FIG. 8 as an example, from the bottom to the top of the display screen 120, each layer is numbered 1-11. Among them, layer 7 is the small aperture imaging layer 122, and layer 3 is the light blocking layer 123. Layer 1 is an organic material layer, which is a flexible substrate layer. For example, it can be an active matrix organic light-emitting diode (Active-matrix organic light-emitting diode, AMOLED) inherent substrate. The thickness and material selection should meet the requirements of the screen itself and the requirements of light transmission. The

layers

2, 4, and 6 adjacent to layer 3 and layer 7 are all inorganic material layers. Since the inorganic layer has a similar film structure with the small hole imaging layer 7 and the light blocking layer 3, the contact is good and no peeling occurs (Peeling) Therefore, you can choose to wrap the small hole imaging layer and the light blocking layer with an inorganic layer; layer 8 is a buffer layer, or an inorganic material layer, and can also be used to grow circuits on the upper surface, that is, the display screen 120 of the embodiment of the present application also A circuit layer may be included, that is, layer 9 shown in FIG. 8. Layer 5 is an organic material layer located between two inorganic material layers. Its purpose is to increase the flexibility of the screen. In addition to the flexibility requirements of the screen, its thickness is also determined by the imaging size of the small holes on the light-blocking layer. The layer 10 is the pixel layer 121, that is, the light-emitting layer, and also includes a flexible package.

Optionally, the display screen 120 of the embodiment of the present application may further include a cover plate. For example, as shown in FIG. 8, the layer 11 is the upper surface of the display screen 120 and covers the front surface of the electronic device 100 to protect the pixel layer. Therefore, in the embodiments of the present application, the so-called finger pressing 110 on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate. Optionally, the cover plate may be a glass cover plate or a sapphire cover plate.

It should be understood that when the aperture imaging layer 122, the light blocking layer 123, and the optical sensing pixels in the fingerprint identification device 130 are provided as shown in FIG. 6 and FIG. 7, light signals in four directions can be correspondingly collected. Specifically, as shown in FIG. 9, a small hole in the small hole imaging layer 122 corresponds to four through holes in the light blocking layer 123, and there are four optical sensing pixels that receive light signals in four different directions. The optical signals in these directions are numbered 1-4 in FIG. 9, that is, the same numbers in FIG. 9 indicate that the directions of the received optical signals are the same. In other words, the optical sensing pixel array included in the fingerprint identification device 130 can receive light signals in four directions as shown in the upper left corner of FIG. 9.

It should be understood that the optical signals in the same direction in the optical signals received by the optical sensing pixel array can be used to generate the same fingerprint image, and the optical signals in multiple directions received by the optical sensing pixel array can be used to generate multiple fingerprints. image. Optionally, the electronic device 100 may further include a processing unit or processor, and the processor is configured to generate a fingerprint image for fingerprint identification. Specifically, the processor obtains the optical signals in the same direction among these optical signals. Taking the optical signal numbered 1 as shown in FIG. 9 as an example, it obtains the optical signal shown in the upper right corner of FIG. 9. That is, a part of the image of the fingerprint. Since the small hole imaging will invert the image, the acquired image is inverted to obtain a fingerprint image as shown in the lower right corner of FIG. 9. As shown in Figure 9, 4 fingerprint images can be obtained from light signals in 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 of the multiple fingerprint images may also be used for fingerprint anti-counterfeiting authentication. Specifically, the difference between multiple fingerprint images can be used for fingerprint anti-counterfeiting authentication of the finger. For example, as shown in FIG. 9, for two fingerprint images obtained with number 1 and number 2, the difference between the two fingerprint images It can be used to judge true and false fingers.

Therefore, the electronic device 100 of the embodiment of the present application can guide the light signal with a specific direction to be transmitted to the optical sensing pixel array in the fingerprint recognition device below by providing the small hole imaging layer and the light blocking layer in the display screen, so that the optical The sensor pixel array can receive light signals in different directions, and realize the multi-angle light path design in the screen. It can receive light from different directions one to one. After processing, it can obtain a complete high-quality image of the same fingerprint from multiple viewing angles. At the same time, the thickness of the fingerprint identification device or photosensitive device can be greatly reduced.

In the foregoing, an embodiment using the principle of small hole imaging for imaging to obtain a fingerprint image is introduced, and an embodiment using the principle of lens imaging for imaging to obtain a fingerprint image is received below.

Optionally, the embodiment of the present application also provides another electronic device with a fingerprint identification device. Specifically, referring to the electronic device 100 shown in FIG. 2, FIG. 10 shows a side view of the electronic device 200 according to an embodiment of the present application. As shown in FIG. 10, the electronic device 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 under-screen optical fingerprint identification. In addition, as shown in FIG. 10, "210" above the display screen 220 represents an object of fingerprint recognition. For example, when a user performs fingerprint recognition, a finger 210 touches the upper surface of the display screen 220.

Specifically, the display screen 220 respectively includes a pixel layer 221 and a plurality of light blocking layers from top to bottom. Wherein, the pixel layer 221 is the same as the pixel layer 121 in the electronic device 100, and for the sake of brevity, it will not be repeated here.

For the multiple light-blocking layers, two or more light-blocking layers may be included. Considering the thickness of the display screen 220, usually two or three light-blocking layers may be provided. For example, as shown in FIG. 10, the following mainly refers to The two light blocking layers 222 and 223 are described as an example, but the present invention is not limited to this.

Specifically, each of the plurality of light blocking layers has an array of through holes to form a plurality of light guide channels in different directions. Here, the layer closest to the pixel layer 221 among the multiple light-blocking layers is called the first light-blocking layer, that is, 222 in FIG. A light-blocking layer is referred to herein as the second light-blocking layer, wherein the size of the through hole array of the first light-blocking layer 222 is the smallest among the plurality of light-blocking layers.

Optionally, the shapes of the through holes in the multiple light blocking layers may be the same or different, and the sizes may also be the same or different. For example, the shapes of the through holes in the same light blocking layer can be set to be the same, or the shapes of the through holes in multiple light blocking layers are all set to the same. For another example, the size of the through hole 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 hole of each light blocking layer in the plurality of light blocking layers extends from the first light blocking layer to The lower one increases sequentially, that is, the through hole size of the first light blocking layer 222 is the smallest, and the through hole size of the lowest light blocking layer is the largest. For ease of description, the following description and the corresponding drawings take as an example that the through holes in the multiple 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 embodiments of the present application are not limited to this. .

Correspondingly, as shown in FIG. 10, the fingerprint identification device 230 below the display screen 220 may include: a microlens array 231 and an optical sensing pixel array 232. Wherein, the micro lens array 231 is arranged below the plurality of light blocking layers; the optical sensing pixel array 232 is arranged below the micro lens array 231, and each of the plurality of light guide channels corresponds to the optical sensing pixel array One optical sensor pixel in 232.

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

It should be understood that the electronic device 200 of the embodiment of the present application can be used for imaging through the microlens array 231. Specifically, FIG. 11 shows a schematic diagram of the principle of lens imaging. As shown in FIG. 11, "object" represents the object side of the lens imaging, and the vertical arrow represents the object side object; "image" represents the image formed by the lens The side and the middle are lenses. As shown in FIG. 11, the light (in various directions) emitted from various points of the object on the object side reconverges together through the middle lens to form a corresponding point, thereby forming an image on the image side.

However, unlike FIG. 11, the display screen 220 of the embodiment of the present application is provided with multiple light-blocking layers. Specifically, as shown in FIG. 12, multiple light blocking layers are equivalent to adding multiple diaphragms between the object side and the intermediate lens shown in FIG. 11, that is, multiple light blocking layers are equivalent to the object side and the lens in FIG. The black in between indicates the diaphragm, for example, FIG. 12 shows a two-layer diaphragm. At this time, since the relationship between the object and the image is one-to-one during the lens imaging process, the increased diaphragm, that is, the light-blocking layer, can realize the optical path selection, so that only the optical signal in certain directions can be converged to the lens through the lens. On the image side, other light signals will be blocked by the light blocking layer.

It should be understood that according to the optical path shown in FIG. 12, since multiple light blocking layers are provided above the lens, only light signals in certain directions can pass through the lens to the optical sensing pixel array. Specifically, as an example for ease of description, the multiple light guide channels formed by multiple light blocking layers are grouped below. As shown in FIG. 13, for any one of the through holes in the first light blocking layer 222, the light guide channel passing through the through hole is a group of light guide channels, that is, the same group of light guide channels will pass through the first For the same through hole in the light blocking layer 222, a group of light guide channels may include one or more light guide channels. For example, if each group of light guide channels includes one light guide channel, the directions of different groups of light guide channels are different; if each group of light guide channels includes multiple light guide channels, the directions of the same group of light guide channels are different, but Different groups of light guide channels may include light guide channels with the same direction.

Taking the two light blocking layers shown in FIG. 10 or FIG. 13 as an example, the same group of light guide channels corresponds to a through hole in the first light blocking layer 222, and the group of light guide channels may correspond to the second light blocking layer 223. One or more through holes, for example, 2, 4, or 9 through holes. The following description takes four as examples. 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 direction of the same group of light guide channels can be set according to actual applications, for example, can be set to any value by adjusting the distance between different light blocking layers and the distribution of 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, a plurality of optical sensing pixels corresponding to the same group of light guide channels are also symmetrical with respect to the corresponding through holes distributed. As shown in FIG. 13, any one of the through holes in the first light blocking layer 222 corresponds to the four through holes in the second light blocking layer 223, that is, each group of light guide channels includes 4 light guide channels. The channel corresponds to the four optical sensing pixels in the optical sensing pixel array. The four through holes of the same group of the light blocking layer 223, the correspondingly formed four light guide channels, and the corresponding four optical sensing pixels below can all be opposed to each other. The small holes in the first light blocking layer 222 are symmetrically distributed. For example, in FIG. 13, the four through holes of the second light blocking layer 223 and the corresponding four optical sensing pixels below are respectively distributed in a square shape, and both 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 multiple light-blocking layers and the distribution of the through holes in each light-blocking layer, the angle of each optical signal in the optical signals in different directions transmitted by the same group of light guide channels can be set to Any value. Specifically, as shown in FIG. 13, the angles between the four directions of the optical signals passing through the four through holes of the second light blocking layer 223 and the second light blocking layer 223 can be any value. For example, when the four through holes are symmetrical with respect to the through holes of the first light blocking layer 222, the angles between the optical signals in the four directions and the second light blocking layer 223 are the same. Wherein, referring to FIG. 12, it can be seen that due to the arrangement of the apertures of the through holes in the multiple light-blocking layers, the optical signals transmitted by them are roughly tapered. Therefore, the optical signals transmitted by the four through holes as shown in FIG. 13 and the second The same included angle of the light blocking layer 223 means that the light signals in the four directions correspond to four cones, which are the same as those of the second light blocking layer 223.

Optionally, different optical signals passing through the same group of light guide channels can be set to be perpendicular to each other. For example, as shown in FIG. 13, the optical signals passing through the four through holes of the second light blocking layer 223 are set to The included angle of the second light blocking layer 223 is equal to 45°. At this time, the optical signals in the four directions are perpendicular to each other.

It should be understood that the optical signal transmitted through the light guide channel will be converged by the microlens array 231, and the corresponding relationship between each light guide channel and the microlens array 231 can be set according to actual applications. For example, one light guide channel of the multiple light guide channels formed by multiple light blocking layers can correspond to one microlens in the microlens array 231, that is, the light guide channel corresponds to the microlens one by one; for another example, as shown in FIG. 13 As shown, the same group of light guide channels can also correspond to one microlens in the microlens array 231; for another example, as shown in FIG. 10, at least two of the multiple light guide channels intersect below the multiple light blocking layers The light guide channel corresponds to a microlens in the microlens array 231, and the embodiment of the present application is not limited to this.

It should be understood that each optical sensing pixel in the embodiment of the present application corresponds to a light guide channel, and each optical sensing pixel is arranged on a corresponding light path converged by a lens, so that multiple optical sensing pixels corresponding to the same group of light guide channels can be formed. The sensing pixel array can receive light signals in multiple directions, and the multiple directions are the directions after each light guide channel is converged by the lens. Therefore, the setting of the position of each optical sensing pixel in the optical sensing pixel array 232 in the embodiment of the present application is related to the corresponding light guide channel and also related to the position of the light path where the microlenses converge.

It should be understood that the foregoing description of the through holes of the multiple light blocking layers is described in conjunction with the perspective view shown in FIG. 13; referring to FIG. 13, FIG. 14 correspondingly shows a schematic plan view of the through holes of the multiple 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 a through hole of the first light blocking layer 222, which is shaded in FIG. The 9 smallest circles in, represent the 9 through holes of the first light blocking layer 222; each of the 9 through holes corresponds to the surrounding 4 circles, which represent a group of through holes in the second light blocking layer 223 , That is, corresponding to a group of 4 through holes in the second light blocking layer 223 shown in FIG. 13, if each group of through holes is numbered 1-4, the corresponding 4 light guide channels can be obtained as shown in FIG. Each group of 4 directions of optical signals.

It should be understood that the optical sensing pixel array 232 of the embodiment of the present application can obtain light signals in different directions and can be used to generate multiple fingerprint images. Among the optical signals received by the optical sensing pixel array 232, the optical signals in the same direction are used to generate 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 fingerprint images obtained include light signals in multiple directions. Therefore, the fingerprint image obtained by the electronic device 200 is suitable for the related description of FIG. 9. For brevity, it is not repeated here. .

It should be understood that the display screen 220 in the embodiment of the present application has multiple light blocking layers, and the display screen 120 has a pinhole imaging layer 122 and a light blocking layer 123. Other than this difference, the description of the display screen 220 is applicable to the display screen 120 For the sake of brevity, the related description of is not repeated here.

For example, a fingerprint detection area may be set on the display screen 220, and the related description of the fingerprint detection area is consistent with that of the fingerprint detection area 124 of the display screen 120. For the sake of brevity, details are not repeated here.

For another example, as shown in FIG. 10 and FIG. 2, if the first light blocking layer 222 in the display screen 220 is replaced by the aperture imaging layer 122 in the display screen 120, the second light blocking layer 223 in the display screen 220 By replacing the light blocking layer 123 in the display screen 120, the structure of the display screen 220 and the display screen 120 can be completely the same.

For another example, the display screen 220 may also include multiple layers of inorganic material, and the multiple layers of inorganic material are respectively used to adhere to the upper surface and the lower surface of each light blocking layer of the plurality of light blocking layers. The display screen 220 may further include at least one organic material layer, and the at least one organic material layer includes: organic material between two inorganic material layers located between two adjacent light-blocking layers in the plurality of light-blocking layers. The material layer, and/or, the organic material layer located under the light-blocking layer closest to the fingerprint identification device among the 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 located between the pixel layer 221 and the first light blocking layer 220.

In addition, any optical sensing pixel in the optical sensing pixel array 232 in the embodiment of the present application may be similar to any optical sensing pixel in the fingerprint identification device 130, for example, any optical sensing pixel in the optical sensing pixel array 232 is also It can be a photodetector. For the sake of brevity, it will not be repeated here.

Therefore, in the electronic device 200 of the embodiment of the present application, multiple light-blocking layers are provided in the display screen to form light guide channels in different directions, thereby guiding the light signal with a specific direction to be transmitted to the microlens in the fingerprint recognition device below. Array, the microlens array converges the optical signal to the corresponding optical sensor pixel array, so that the optical sensor pixel array can receive the light signal in different directions, realizes the multi-angle optical path design in the screen, and receives light from different directions one to one. After processing, a complete high-quality image of the same fingerprint from multiple viewing angles can be obtained, and the thickness of the fingerprint identification device or the photosensitive device can be greatly reduced.

It should be understood that, for the electronic device 100 and the electronic device 200 in the embodiments of the present application, the fingerprint identification device included therein may also include other components in addition to the microlens array and/or the optical sensing pixel array described above. For example, the reading circuit and other auxiliary circuits that can also be electrically connected to the optical sensing pixel array can be fabricated on a chip (Die) through a semiconductor process and the optical sensing 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 also be included above the optical sensing pixel array, which is mainly used to isolate the influence of external interference light on the optical fingerprint detection. Among them, the filter layer can be used to filter out the ambient light penetrating the finger. The filter layer can be set for each optical sensor pixel to filter out interference light, or a large area filter layer can also be used to cover the optical sensor. Pixel array.

For the electronic device 200 of the present application, the microlens array 231 and the optical sensing pixel array 232 can be packaged in the same optical fingerprint component; alternatively, the microlens array 231 can also be arranged outside the chip where the optical sensing pixel array 232 is located, such as pasting It is combined above the chip where the optical sensing pixel array 232 is located.

A person of ordinary skill in the art may realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

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

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disks or optical disks and other media that can store program codes. .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A fingerprint identification device, characterized in that it is suitable for under the display screen to realize under-screen optical fingerprint identification, and the display screen respectively includes a pixel layer and a plurality of light-blocking layers from top to bottom,

The pixel layer includes a light-emitting display pixel array, and the light-emitting display pixel array is used to emit light and illuminate a finger,

Each light-blocking layer of the plurality of light-blocking layers has an array of through holes to form a plurality of light-guiding channels in different directions. The size of the through-hole array is the smallest;

The fingerprint identification device includes:

The optical sensing pixel array is arranged under the plurality of light blocking layers, and each light guide channel of the plurality of light guide channels corresponds to one optical sensing pixel,

Wherein, the plurality of light guide channels are used to transmit optical signals in different directions in the return optical signal passing through the finger to the plurality of optical sensing pixels in the optical sensing pixel array, in the optical sensing pixel array Each optical sensing pixel of the optical sensor is used to receive the optical signal transmitted through the corresponding light guide channel, and the optical signal is used to perform fingerprint recognition of the finger.
The fingerprint identification device according to claim 1, wherein 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 sensing pixel arrays receive multiple Directional light signals are used to generate multiple fingerprint images.
The fingerprint identification device according to claim 2, wherein the difference between at least two fingerprint images in the plurality of fingerprint images is used for fingerprint anti-counterfeiting authentication of the finger.
The fingerprint identification device according to any one of claims 1 to 3, wherein the through hole arrays in the plurality of light blocking layers are used to form multiple groups of light guide channels, and the first light blocking layer One through hole in the corresponding to form a group of light guide channels, and the group of light guide channels includes at least two light guide channels with different directions.
The fingerprint identification device according to claim 4, wherein each through hole in the first light blocking layer is used to realize small hole imaging.
The fingerprint identification device according to claim 4, further comprising:

A microlens array is disposed between the plurality of light blocking layers and the optical sensing pixel array, and is used for converging light signals passing through the plurality of light guide channels in different directions into the optical sensing pixel array, respectively Of multiple optical sensing pixels.
The fingerprint identification device according to claim 6, wherein one light guide channel in the plurality of light guide channels corresponds to one micro lens in the micro lens array.
The fingerprint identification device according to claim 6, wherein at least two light guide channels of the plurality of light guide channels intersecting under the plurality of light blocking layers correspond to one microlens array in the microlens array. lens.
7. The fingerprint identification device according to claim 6, wherein one group of light guide channels in the plurality of groups of light guide channels corresponds to one microlens in the microlens array.
The fingerprint identification device according to any one of claims 4 to 9, 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 same group of light guide channels are symmetrically distributed with respect to the corresponding through holes in the first light blocking layer. The multiple optical sensing pixels corresponding to the light channel are symmetrically distributed with respect to the corresponding through hole.
The fingerprint identification device according to claim 10, wherein each group of light guide channels in the plurality of groups of light guide channels includes 4 light guide channels, and the 4 light guide channels correspond to the optical sensing pixels 4 optical sensing pixels in the array.
The fingerprint identification device according to claim 11, wherein the four optical sensing pixels corresponding to the same group of light guide channels are distributed in a square shape.
The fingerprint identification device according to claim 11 or 12, wherein the optical signals in the four directions received by the four optical sensing pixels are perpendicular to each other.
The fingerprint identification device according to any one of claims 1 to 13, wherein the through holes of the same light-blocking layer in the plurality of light-blocking layers have the same shape.
15. The fingerprint identification device of claim 14, wherein all the through holes in the plurality of light blocking layers have the same shape and are all circular.
The fingerprint identification device according to claim 14 or 15, wherein the size of the through hole of the same light-blocking layer in the plurality of light-blocking layers is the same, and the size of each light-blocking layer in the plurality of light-blocking layers is the same. The size of the through hole sequentially increases downward from the first light blocking layer.
The fingerprint identification device according to claim 16, wherein the diameter of the small hole in the first light blocking layer is less than or equal to 5 μm.
The fingerprint identification device according to claim 16 or 17, 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- 10μm.
A display screen, characterized by comprising: a pixel layer and a plurality of light blocking layers,

The pixel layer includes a light-emitting display pixel array, and the light-emitting display pixel array is used to emit light and illuminate a finger,

Each light-blocking layer of the plurality of light-blocking layers has an array of through holes to form a plurality of light-guiding channels in different directions. The size of the through hole array is the smallest. The multiple light guide channels are used to transmit light signals in different directions in the return light signal passing through the finger to the fingerprint identification device, and the light signals are used to perform the Fingerprint recognition.
18. The display screen of claim 19, further comprising: a multilayer inorganic material layer,

The multi-layer inorganic material layers are respectively used for bonding with the upper surface of each light blocking layer and bonding with the lower surface of each light blocking layer in the plurality of light blocking layers.
The display screen of claim 20, further comprising at least one organic material layer,

The at least one organic material layer includes:

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

An organic material layer located under the light-shielding layer closest to the fingerprint identification device among the light-shielding layers.
The display screen according to any one of claims 19 to 21, wherein the through hole arrays in the plurality of light blocking layers are used to form multiple groups of light guide channels, and the first light blocking layer One through hole 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.
The display screen of claim 22, wherein the same group of light guide channels are symmetrically distributed with respect to the corresponding through holes in the first light blocking layer.
The display screen according to claim 23, wherein each group of light guide channels in the plurality of groups of light guide channels includes 4 light guide channels, and the through holes in each light blocking layer belong to the same group of light guide channels It is distributed in a square shape, and the directions of the four light guide channels are perpendicular to each other.
The display screen according to any one of claims 19 to 24, wherein the through holes of the same light-blocking layer in the plurality of light-blocking layers have the same shape.
26. The display screen of claim 25, wherein all the through holes in the plurality of light blocking layers have the same shape and are all circular.
The display screen according to claim 25 or 26, wherein the size of the through holes of the same light blocking layer in the plurality of light blocking layers is the same, and the through hole of each light blocking layer in the plurality of light blocking layers The size of the hole gradually increases from the first light blocking layer downward.
The display screen of claim 27, wherein the diameter of the small holes in the first light blocking layer is less than or equal to 5 μm.
The display screen according to claim 27 or 28, 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 .
The display screen according to any one of claims 19 to 29, further comprising: a cover plate located above the pixel layer for protecting the pixel layer.
The display screen according to any one of claims 19 to 30, further comprising: a circuit layer, the circuit layer being located between the pixel layer and the first light blocking layer.
An electronic device, characterized in that it comprises:

The fingerprint identification device according to any one of claims 1 to 18; and

The display screen according to any one of claims 19 to 31, the fingerprint identification device is located below the display screen.
The electronic device according to claim 32, further comprising: a processing unit, configured to:

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

Perform fingerprint recognition on the finger based on the plurality of fingerprint images.
The electronic device according to claim 33, wherein the processing unit is configured to:

The optical signals with the same direction among the optical signals in the multiple directions received by the optical sensing pixel array are generated to generate the same fingerprint image.
The electronic device according to claim 34, wherein the processing unit is further configured to:

According to the difference between at least two fingerprint images in the plurality of fingerprint images, it is determined whether the finger is a real finger.