WO2021174423A1 - Appareil de reconnaissance d'empreintes digitales, écran d'affichage et dispositif électronique - Google Patents

Appareil de reconnaissance d'empreintes digitales, écran d'affichage et dispositif électronique Download PDF

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Publication number
WO2021174423A1
WO2021174423A1 PCT/CN2020/077648 CN2020077648W WO2021174423A1 WO 2021174423 A1 WO2021174423 A1 WO 2021174423A1 CN 2020077648 W CN2020077648 W CN 2020077648W WO 2021174423 A1 WO2021174423 A1 WO 2021174423A1
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WIPO (PCT)
Prior art keywords
light
layer
light guide
guide channels
display screen
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PCT/CN2020/077648
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English (en)
Chinese (zh)
Inventor
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
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN202080001552.8A priority Critical patent/CN111788577B/zh
Priority to PCT/CN2020/077648 priority patent/WO2021174423A1/fr
Publication of WO2021174423A1 publication Critical patent/WO2021174423A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • This application relates to the field of biometric identification, and in particular to fingerprint identification devices, display screens and electronic equipment.
  • the under-screen optical fingerprint system has been mass-produced in electronic products such as smart phones.
  • 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.
  • 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.
  • 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.
  • 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.
  • a fingerprint recognition device 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.
  • 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.
  • 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.
  • 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 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.
  • each through hole in the first light blocking layer is used to realize small hole imaging.
  • 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.
  • a light-blocking layer that can be used for small-hole imaging
  • at least one other light-blocking layer 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.
  • 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.
  • the microlens array 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.
  • one light guide channel in the plurality of light guide channels corresponds to one microlens in the microlens array.
  • 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.
  • one group of light guide channels in the plurality of groups of light guide channels corresponds to one microlens in the microlens array.
  • 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.
  • 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.
  • the four optical sensing pixels corresponding to the same group of light guide channels are respectively distributed in a square shape.
  • the optical signals in the four directions received by the four optical sensing pixels are perpendicular to each other.
  • the through holes of the same light-blocking layer in the plurality of light-blocking layers have the same shape.
  • all the through holes in the plurality of light blocking layers have the same shape and are all circular.
  • 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.
  • the diameter of the small hole in the first light blocking layer is less than or equal to 5 ⁇ m.
  • 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 5 ⁇ m-10 ⁇ m.
  • a display screen 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the same group of light guide channels are symmetrically distributed with respect to the corresponding through holes in the first light blocking layer.
  • each group of light guide channels in the plurality of groups of light guide channels includes 4 light guide channels.
  • the through holes belonging to the same group of light guide channels in each light blocking layer are distributed in a square shape.
  • the directions of the four light guide channels are perpendicular to each other.
  • the through holes of the same light-blocking layer in the plurality of light-blocking layers have the same shape.
  • all the through holes in the plurality of light blocking layers have the same shape.
  • the shape of all the through holes in the plurality of light blocking layers is circular.
  • the sizes of the through holes of the same light-blocking layer in the plurality of light-blocking layers are the same.
  • 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.
  • the diameter of the small holes in the first light blocking layer is less than or equal to 5 ⁇ m.
  • 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 5 ⁇ m-10 ⁇ m.
  • the display screen further includes: a cover plate located above the pixel layer for protecting the pixel layer .
  • the display screen further includes: a circuit layer located between the pixel layer and the first light blocking layer between.
  • an electronic device 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the technical solutions of the embodiments of the present application can be applied to various electronic devices.
  • 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).
  • ATM bank automated teller machines
  • the embodiment of the present application does not limit this.
  • biometric recognition technologies include, but are not limited to, fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition.
  • fingerprint recognition technology 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.
  • 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.
  • 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.
  • the under-screen optical fingerprint system has been mass-produced in electronic products such as smart phones.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • "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.
  • 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.
  • the display screen 120 may be an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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).
  • the above-mentioned reflected light and scattered light are collectively referred to as return light.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • TP touch panel
  • 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.).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the fingerprint detection area in the display screen 120 of the embodiment of the present application is marked as 124 here.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the fingerprint button such as the Home button
  • 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.
  • 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.
  • two or more light-blocking layers may be included.
  • two or three light-blocking layers may be generally provided.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the through hole of any one of the multiple light blocking layers can be set to be used for small hole imaging.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 ⁇ m.
  • 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.
  • 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.
  • 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 light blocking layer 123 in the embodiment of the present application may be provided with one layer or multiple layers.
  • the light blocking layer 123 may be provided with only one layer.
  • the light blocking layer 123 can also be provided with two or more layers.
  • 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.
  • a layer of light blocking layer 123 is mainly used for description, but the embodiment of the present application is not limited thereto.
  • the shapes of the through holes in the light blocking layer 123 may be the same or different.
  • 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.
  • the present application takes as an example that all the through holes included in the light blocking layer 123 are circular.
  • the size of the through hole of the light blocking layer 123 can be set to any value according to actual applications.
  • 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.
  • the diameter of the circular through hole in the light blocking layer 123 may range from 5 ⁇ m to 10 ⁇ m.
  • the sizes of different through holes in the light blocking layer 123 may be the same or different.
  • 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.
  • 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.
  • 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.
  • each small hole in the small hole imaging layer 122 can realize small hole imaging.
  • FIG. 4 shows a schematic diagram of the principle of small hole imaging.
  • object represents the object side of the small hole imaging
  • image represents the image side of the small hole imaging
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a group of through holes can be arranged symmetrically.
  • 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.
  • the four through holes are distributed in a square shape on the light blocking layer 123.
  • 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.
  • each light signal can be set to any value.
  • 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.
  • the angles between the optical signals in the four directions and the light blocking layer 123 are the same.
  • 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.
  • 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.
  • the included angle of is equal to 45°.
  • the optical signals in the four directions are perpendicular to each other.
  • 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.
  • each small hole corresponds to a group of 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 fingerprint images of A, B, C, and D can overlap each other.
  • the display screen 120 may also include other structural layers.
  • 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.
  • the display screen 120 may also include at least one organic material layer.
  • 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.
  • 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.
  • 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.
  • each layer is numbered 1-11.
  • layer 7 is the small aperture imaging layer 122
  • layer 3 is the light blocking layer 123.
  • Layer 1 is an organic material layer, which is a flexible substrate layer.
  • it can be an active matrix organic light-emitting diode (Active-matrix organic light-emitting diode, AMOLED) inherent substrate.
  • AMOLED active matrix organic light-emitting diode
  • 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.
  • 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.
  • the display screen 120 of the embodiment of the present application may further include a cover plate.
  • 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.
  • the cover plate may be a glass cover plate or a sapphire cover plate.
  • 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.
  • 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.
  • 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.
  • 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
  • the optical signals in multiple directions received by the optical sensing pixel array can be used to generate multiple fingerprints.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 10 shows a side view of the electronic device 200 according to an embodiment of the present application.
  • 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.
  • "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.
  • the display screen 220 respectively includes a pixel layer 221 and a plurality of light blocking layers from top to bottom.
  • 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.
  • two or more light-blocking layers may be included.
  • two or three light-blocking layers may be provided.
  • 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.
  • each of the plurality of light blocking layers has an array of through holes to form a plurality of light guide channels in different directions.
  • the 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.
  • 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.
  • 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.
  • 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.
  • 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. .
  • the fingerprint identification device 230 below the display screen 220 may include: a microlens array 231 and an optical sensing pixel array 232.
  • 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
  • the optical signal is used for fingerprint recognition of the finger.
  • FIG. 11 shows a schematic diagram of the principle of lens imaging.
  • object represents the object side of the lens imaging
  • vertical arrow represents the object side object
  • image represents the image formed by the lens
  • the side and the middle are lenses.
  • 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.
  • the display screen 220 of the embodiment of the present application is provided with multiple light-blocking layers.
  • 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.
  • the multiple light guide channels formed by multiple light blocking layers are grouped below.
  • 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
  • a group of light guide channels may include one or more light guide channels.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the angles between the optical signals in the four directions and the second light blocking layer 223 are the same.
  • 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.
  • different optical signals passing through the same group of light guide channels can be set to be perpendicular to each other.
  • 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.
  • 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
  • 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.
  • 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.
  • FIG. 14 correspondingly shows a schematic plan view of the through holes of the multiple light blocking layers.
  • 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.
  • 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.
  • the optical signals in the same direction are used to generate The same fingerprint image.
  • 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.
  • 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. .
  • 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.
  • 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.
  • the structure of the display screen 220 and the display screen 120 can be completely the same.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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. .

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Abstract

Les modes de réalisation de la présente demande concernent un appareil de reconnaissance d'empreintes digitales, un écran d'affichage et un dispositif électronique qui peuvent réduire l'épaisseur de l'appareil de reconnaissance d'empreintes digitales tout en mettant en œuvre la réception de signaux optiques multi-angles. L'écran d'affichage comprend respectivement, de haut en bas : une couche de pixels dans laquelle est situé un réseau de pixels d'affichage électroluminescent et une pluralité de couches de blocage de lumière, chaque couche de blocage de lumière étant pourvue d'un réseau de trous traversants de façon à former une pluralité de canaux de guidage de lumière dans différentes directions. L'appareil de reconnaissance d'empreintes digitales comprend : un réseau de pixels de détection optique disposé en dessous de la pluralité de couches de blocage de lumière, chaque canal de guidage de lumière parmi la pluralité de canaux de guidage de lumière correspondant à un pixel de détection optique, la pluralité de canaux de guidage de lumière étant utilisés pour transmettre, à la pluralité de pixels de détection optique dans le réseau de pixels de détection optique, des signaux lumineux dans différentes directions parmi les signaux lumineux renvoyés par un doigt, chaque pixel de détection optique étant utilisé pour recevoir les signaux optiques transmis par l'intermédiaire de canaux de guidage de lumière correspondants, et le signal optique étant utilisé pour effectuer une reconnaissance d'empreinte digitale du doigt.
PCT/CN2020/077648 2020-03-03 2020-03-03 Appareil de reconnaissance d'empreintes digitales, écran d'affichage et dispositif électronique WO2021174423A1 (fr)

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