WO2021007730A1 - Appareil de détection d'empreintes digitales et dispositif électronique - Google Patents

Appareil de détection d'empreintes digitales et dispositif électronique Download PDF

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Publication number
WO2021007730A1
WO2021007730A1 PCT/CN2019/095880 CN2019095880W WO2021007730A1 WO 2021007730 A1 WO2021007730 A1 WO 2021007730A1 CN 2019095880 W CN2019095880 W CN 2019095880W WO 2021007730 A1 WO2021007730 A1 WO 2021007730A1
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WIPO (PCT)
Prior art keywords
microlens
light
optical
fingerprint detection
fingerprint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/095880
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English (en)
Chinese (zh)
Inventor
马明
蒋鹏
李可
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Goodix Technology Co Ltd
Original Assignee
Shenzhen Goodix Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Goodix Technology Co Ltd filed Critical Shenzhen Goodix Technology Co Ltd
Priority to CN201980004242.9A priority Critical patent/CN111095279B/zh
Priority to PCT/CN2019/095880 priority patent/WO2021007730A1/fr
Priority to EP19929178.2A priority patent/EP3789913B1/fr
Priority to CN201980004244.8A priority patent/CN111108510B/zh
Priority to CN202110586440.XA priority patent/CN113239856B/zh
Priority to KR1020207030945A priority patent/KR102475288B1/ko
Priority to PCT/CN2019/108223 priority patent/WO2021007953A1/fr
Priority to CN201921636356.9U priority patent/CN210864747U/zh
Priority to CN201980004247.1A priority patent/CN111108511B/zh
Priority to CN201921720097.8U priority patent/CN210605739U/zh
Priority to PCT/CN2019/111103 priority patent/WO2021007964A1/fr
Priority to CN201980013671.2A priority patent/CN111801679B/zh
Priority to CN201922451701.8U priority patent/CN211180842U/zh
Priority to PCT/CN2019/129434 priority patent/WO2021008088A1/fr
Priority to US17/034,981 priority patent/US11531430B2/en
Publication of WO2021007730A1 publication Critical patent/WO2021007730A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/143—Sensing or illuminating at different wavelengths
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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

  • the embodiments of the present application relate to the field of fingerprint detection, and more specifically, to fingerprint detection devices and electronic equipment.
  • the under-screen optical fingerprint recognition technology is to install the optical fingerprint module under the display screen, and realize fingerprint recognition by collecting the optical fingerprint image.
  • the requirements for fingerprint recognition performance are getting higher and higher.
  • the contact area between the dry fingers and the display screen is very small, and the recognition response area is very small, resulting in discontinuities in the collected fingerprints and easy loss of feature points, which affects the performance of fingerprint recognition .
  • a fingerprint detection device and electronic equipment are provided, which can solve the following technical problems:
  • the thickness of the fingerprint detection device is too large.
  • the size of the fingerprint detection device is too large.
  • a fingerprint detection device which is suitable for under the display screen to realize under-screen optical fingerprint detection, including:
  • a microlens array configured to be arranged below the display screen and including a plurality of microlenses
  • At least one light blocking layer is disposed under the microlens array, and a plurality of light guide channels corresponding to each of the plurality of microlenses are formed, and a plurality of light guide channels corresponding to each of the plurality of microlenses are formed.
  • the bottom of the light channel respectively extends below the adjacent multiple micro lenses;
  • the optical sensing pixel array is arranged under the at least one light blocking layer and includes a plurality of optical sensing pixels, and one of the plurality of light guide channels corresponding to each microlens is provided below each light guide channel Optical sensor pixels;
  • a plurality of optical sensing pixels are arranged below each microlens, and the plurality of optical sensing pixels arranged below each microlens are respectively used for receiving the convergent and passing through the corresponding plurality of microlenses.
  • the optical signal transmitted by the light guide channel, and the optical signal is used to detect fingerprint information of a finger.
  • Aiming at problem 1 by designing multiple light guide channels for each microlens, and making the bottoms of the multiple light guide channels corresponding to each microlens extend below the adjacent multiple microlenses, each The multiple optical sensing pixels under each microlens can respectively receive oblique light signals converged from multiple adjacent microlenses and transmitted through the corresponding light guide channel.
  • the dry hand fingerprint is not in contact with the OLED screen, the contrast between the fingerprint ridge and the fingerprint valley of the fingerprint image in the vertical direction is poor, and the image is blurred to the point where the fingerprint lines cannot be distinguished.
  • This application uses a reasonable optical path design to allow the optical path to receive light signals in oblique directions , While it can better obtain normal finger fingerprints, it can better detect dry finger fingerprint images.
  • the beneficial effect of this application is to improve the dry hand fingerprint imaging effect and make the dry hand fingerprint image clearer.
  • the optical sensing pixel array can also expand the field of view of the optical sensing pixel array by receiving the oblique light signal.
  • the field of view of the fingerprint detection device can be expanded from 6x9mm 2 to 7.5x10.5mm 2 , which is further improved Fingerprint recognition effect.
  • a plurality of optical sensing pixels are arranged under each microlens, so that the spatial period of the lens array and the spatial period of the optical sensing pixel array are not equal, thereby avoiding moiré fringes in the fingerprint image and improving the fingerprint recognition effect.
  • Aiming at problem 2 by designing multiple light guide channels for each microlens, and making the bottoms of the multiple light guide channels corresponding to each microlens extend below the adjacent multiple microlenses, a single Imaging optical path with micro lens and multiple optical sensing pixels. That is, multiple optical sensing pixels receive light signals at multiple angles by multiplexing a single microlens, which can split and image light beams with different object aperture angles, effectively increasing the amount of light entering the fingerprint detection device, and thus can reduce The exposure time of the optical sensing pixel array, where the aperture angle is also called the lens aperture angle, which is the angle formed by the object point on the optical axis of the microlens and the effective diameter of the front lens of the microlens. The larger the aperture angle of the microlens, the greater the amount of light entering the microlens, which is directly proportional to the effective diameter of the microlens and inversely proportional to the distance of the focal point.
  • the optical sensing pixel array may be divided into a plurality of optical sensing pixel groups, wherein each optical sensing pixel in each optical sensing pixel group is used for receiving the same direction as the light guide channel corresponding to the same optical sensing pixel group
  • the oblique light signal that is, each optical sensing pixel group can generate a fingerprint image based on the received oblique light signal, so the multiple optical sensing pixel groups can be used to generate multiple fingerprint images, in this case It is possible to superimpose the multiple fingerprint images to obtain a high-resolution fingerprint image, and then perform fingerprint identification based on this high-resolution fingerprint image.
  • each microlens can converge oblique light signals in multiple directions through multiple light guide channels, or the optical sensing pixel array can simultaneously acquire multiple fingerprint images through optical path design, even if the optical The exposure time of the sensing pixel array results in a lower resolution of each fingerprint image. It is also possible to process multiple fingerprint images with lower resolution to obtain a fingerprint image with higher resolution.
  • the fingerprint recognition effect can be guaranteed while reducing the exposure time of the optical sensing pixel array (ie, the image sensor).
  • the imaging light path of a single microlens and multiple optical sensing pixels can perform non-frontal light imaging (ie, oblique light imaging) of the object beam of the fingerprint under the screen, especially the one arranged below each microlens
  • the multiple optical sensing pixels are respectively used to receive the optical signals converged by the adjacent multiple microlenses, thereby being able to enlarge the object-side numerical aperture of the optical system and shorten the optical path design of the optical sensing pixel array (that is, the at least one The thickness of the light-blocking layer) can ultimately effectively reduce the thickness of the fingerprint detection device.
  • the imaging light path with a single microlens and multiple optical sensing pixels can perform non-frontal light imaging of the object beam of the fingerprint under the screen, which can expand the object numerical aperture of the optical system and improve the robustness of the system And the tolerance tolerance of the fingerprint detection device.
  • the numerical aperture is the product of the refractive index (h) and the aperture angle (u) of the medium between the front lens of the microlens and the inspected object.
  • the imaging light path of a single microlens and multiple optical sensing pixels and the light guide channel provided in the at least one light blocking layer can improve the performance of the optical sensing pixels without affecting each other.
  • the density of the optical sensing pixels in the optical sensing pixel array can further reduce the size of the fingerprint detection device.
  • the technical solution of the present application can make the optical sensing pixel array 240 only receive the light signal of the oblique angle through a reasonable design of the multiple light guide channels corresponding to each microlens, and converge multiple angles through a single microlens.
  • the oblique light signal solves the problem of too long exposure time for the single-object telecentric microlens array scheme.
  • the fingerprint detection device can not only solve the problem of poor recognition of dry fingers by the vertical light signal and the long exposure time of the single-object telecentric microlens array, but also solve the thickness of the fingerprint detection device. Too big, too poor tolerance tolerance and too big size problems.
  • the multiple light guide channels corresponding to each microlens are centrally symmetrically distributed along the optical axis direction of the same microlens.
  • the process complexity of the fingerprint detection device can be reduced.
  • each light guide channel of the plurality of light guide channels corresponding to each microlens forms a preset angle with the first plane, so that a plurality of light guide channels are arranged below each microlens.
  • the optical sensing pixels are respectively used for receiving optical signals converged by a plurality of adjacent microlenses and transmitted through the corresponding light guide channel, wherein the first plane is a plane parallel to the display screen.
  • the preset included angle can ensure that the bottom ends of the multiple light guide channels corresponding to each microlens extend below the multiple adjacent microlenses of the same microlens.
  • the preset included angle ranges from 15 degrees to 60 degrees.
  • the projections of the multiple light guide channels corresponding to each microlens on the first plane are symmetrically distributed relative to the optical axis of the same microlens on the projection center of the first plane.
  • each optical sensing pixel in the optical sensing pixel array can receive sufficient light signals, thereby improving the resolution of the fingerprint image and the fingerprint recognition effect.
  • the distribution of the multiple optical sensing pixels under each microlens is polygonal.
  • microlenses in the microlens array are distributed in an array, when the distribution of the multiple optical sensing pixels under each microlens is polygonal, the correspondence between the microlens array and the optical sensing array can be effectively simplified. In this way, the structural design of the fingerprint detection device is simplified.
  • the polygon is a rectangle or a rhombus.
  • the at least one light blocking layer is a plurality of light blocking layers, and at least one opening corresponding to each microlens is provided in different light blocking layers to form each microlens Corresponding multiple light guide channels.
  • the number of openings in different light blocking layers corresponding to the same microlens increases sequentially from top to bottom.
  • the optical signals expected to be received by the optical sensing pixel array can be filtered out.
  • the smaller upper part of the light-blocking layer and the lower part of the light-blocking layer with a larger opening density can form multiple light guide channels for each microlens.
  • the preparation complexity of the at least one light blocking layer can be reduced, and the strength of the upper part of the light blocking layer can be increased.
  • the apertures of the openings in different light blocking layers corresponding to the same microlens are sequentially reduced from top to bottom.
  • the optical signals expected to be received by the optical sensing pixel array can be filtered out.
  • each of the microlenses can image the oblique light signal in the openings of the bottom light-blocking layer of the plurality of light-blocking layers, thereby realizing micro-aperture imaging.
  • the bottom light-blocking layer of the plurality of light-blocking layers is provided with a plurality of openings corresponding to each microlens, and a plurality of light guide channels corresponding to each microlens Pass through a plurality of openings corresponding to the same micro lens in the bottom light blocking layer respectively.
  • the non-bottom light-blocking layer of the plurality of light-blocking layers is provided with an opening in the middle position of the back focus of two adjacent microlenses in the plurality of microlenses, and the The two light guide channels corresponding to the two adjacent microlenses all pass through the corresponding openings of the two adjacent microlenses in the non-bottom light blocking layer.
  • the top light-blocking layer of the plurality of light-blocking layers is provided with an opening on the optical axis of each microlens, and a plurality of light guide channels corresponding to each microlens All pass through the corresponding openings of the same micro lens in the top light blocking layer.
  • the at least one light blocking layer includes only one light blocking layer, and the plurality of light guide channels are a plurality of inclined through holes corresponding to the same microlens in the one light blocking layer.
  • the thickness of the one light-blocking layer is greater than a preset threshold, so that the multiple optical sensing pixels disposed under each microlens are respectively used to receive the light-blocking layer through the adjacent multiple microlenses.
  • the fingerprint detection device further includes:
  • the transparent medium layer is set in at least one of the following positions:
  • the at least one light blocking layer and the optical sensing pixel array are configured to be used as the at least one light blocking layer and the optical sensing pixel array.
  • the at least one light blocking layer and the microlens array are integrated, or the at least one light blocking layer and the optical sensing pixel array are integrated.
  • each microlens satisfies at least one of the following conditions:
  • the projection of the condensing surface of the micro lens on a plane perpendicular to its optical axis is rectangular or circular;
  • the condensing surface of the microlens is spherical or aspherical;
  • the curvature of the light-condensing surface of the microlens is the same in all directions;
  • the micro lens includes at least one lens
  • the focal length of the microlens is in the range of 10um-2mm.
  • the microlens array meets at least one of the following conditions:
  • the microlens array is arranged in a polygonal shape
  • the duty cycle of the microlens array ranges from 100% to 50%.
  • the period of the microlens array is not equal to the period of the optical sensing pixel array, and the period of the microlens array is a rational multiple of the period of the optical sensing pixel array.
  • the distance between the fingerprint detection device and the display screen is 20um-1000um.
  • the device further includes:
  • the filter layer is set in at least one of the following positions:
  • an electronic device including:
  • Display screen the device for fingerprint detection in the first aspect or any possible implementation of the first aspect, the device is arranged below the display screen to achieve under-screen optical fingerprint detection.
  • Fig. 1 is a schematic structural diagram of an electronic device to which the present application can be applied.
  • Fig. 2 is a schematic cross-sectional view of the electronic device shown in Fig. 1.
  • Fig. 3 is another schematic structural diagram of an electronic device to which the present application can be applied.
  • Fig. 4 is a schematic cross-sectional view of the electronic device shown in Fig. 3.
  • Fig. 5 is a front view of a fingerprint detection device according to an embodiment of the present application.
  • Fig. 6 is a schematic top view of a fingerprint detection device according to an embodiment of the present application.
  • FIG. 7 and 8 are schematic diagrams of modified structures of the fingerprint detection device shown in FIG. 5.
  • FIG. 9 is another schematic top view of the fingerprint detection device of the 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 embodiments of the present application are not limited thereto.
  • biometric recognition technology includes but is not limited to fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition.
  • fingerprint recognition technology includes but is not limited to fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition.
  • fingerprint recognition technology uses fingerprint recognition technology as an example.
  • 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 recognition module uses the 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.
  • 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 identification module may be to implement the desired optical imaging by appropriately configuring optical elements for collecting and detecting the returned light, so as to detect the fingerprint information of the finger.
  • in-display fingerprint recognition technology refers to the installation of fingerprint recognition modules or part of fingerprint recognition modules inside the display screen, so as to realize fingerprint recognition operations in the display area of the display screen without the need for electronic
  • the fingerprint collection area is set on the front of the device except the display area.
  • FIG. 1 and FIG. 3 are schematic diagrams of the orientation of the electronic device 10
  • FIG. 2 and FIG. 4 are cross-sectional schematic diagrams of the electronic device 10 shown in FIG. 1 and FIG. 3, respectively.
  • the electronic device 10 may include a display screen 120 and an optical fingerprint recognition module 130.
  • the display screen 120 may be a self-luminous display, which uses a self-luminous display unit as display pixels.
  • 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 display screen 120 may also be specifically a touch display screen, which can not only perform screen display, but also detect a user's touch or pressing operation, so as to provide a user with a human-computer interaction interface.
  • the electronic device 10 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 optical fingerprint module 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131 (also referred to as optical sensing pixels, photosensitive pixels, pixel units, etc.).
  • the area where the sensing array 133 is located or the sensing area thereof is the fingerprint detection area 103 of the optical fingerprint module 130 (also referred to as fingerprint collection area, fingerprint recognition area, etc.).
  • the optical fingerprint module 130 is arranged in a partial area below the display screen 120.
  • the fingerprint detection area 103 may be located in the display area of the display screen 120.
  • the optical fingerprint module 130 may also be arranged in other positions, such as the side of the display screen 120 or the non-transparent area at the edge of the electronic device 10, and the optical fingerprint module 130 may be designed to The optical signal from at least a part of the display area of the display screen 120 is guided to the optical fingerprint module 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
  • the electronic device 10 when the user needs to unlock the electronic device 10 or perform other fingerprint verification, only need to press the finger on the fingerprint detection area 103 located in the display screen 120 to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 adopting the above structure does not need to reserve space on the front side for setting fingerprint buttons (such as the Home button), so that a full screen solution can be adopted, that is, the display area of the display screen 120 It can be basically extended to the front of the entire electronic device 10.
  • fingerprint buttons such as the Home button
  • the optical fingerprint module 130 may include a light detecting part 134 and an optical component 132.
  • the light detection part 134 includes the sensor array 133 (also called an optical fingerprint sensor), a reading circuit and other auxiliary circuits electrically connected to the sensor array 133, which can be fabricated on a chip by a semiconductor process (Die), such as an optical imaging chip or an optical fingerprint sensor.
  • the sensing array 133 is specifically a photodetector (photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the optical sensing unit as described above.
  • the optical component 132 may be disposed above the sensing array 133 of the light detecting part 134, and it may specifically include a filter layer (Filter), a light guide layer or a light path guiding structure, and other optical elements.
  • the filter layer It can be used to filter out ambient light penetrating the finger, and the light guide layer or light path guiding structure is mainly used to guide the reflected light reflected from the surface of the finger to the sensing array 133 for optical detection.
  • the optical assembly 132 and the light detecting part 134 may be packaged in the same optical fingerprint component.
  • the optical component 132 and the optical detection part 134 may be packaged in the same optical fingerprint chip, or the optical component 132 may be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 It is attached above the chip, or some components of the optical assembly 132 are integrated into the chip.
  • the area or light sensing range of the sensing array 133 of the optical fingerprint module 130 corresponds to the fingerprint detection area 103 of the optical fingerprint module 130.
  • the fingerprint collection area 103 of the optical fingerprint module 130 may be equal to or not equal to the area or light sensing range of the sensing array 133 of the optical fingerprint module 130, which is not specifically limited in the embodiment of the present application. .
  • the light path is guided by light collimation, and the fingerprint detection area 103 of the optical fingerprint module 130 can be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130.
  • the area of the fingerprint detection area 103 of the optical fingerprint module 130 can be made larger than that of the optical fingerprint module. 130 the area of the sensing array 133.
  • the light path guiding structure that the optical assembly 132 may include is exemplified below.
  • the optical collimator may specifically be a collimator (Collimator) layer fabricated on a semiconductor silicon wafer, which has A plurality of collimating units or micro-holes
  • the collimating unit may be specifically a small hole, among the reflected light reflected from the finger, the light that is perpendicularly incident on the collimating unit can pass through and be received by the sensor chip below it , And the light whose incident angle is too large is attenuated by multiple reflections inside the collimating unit, so each sensor chip can basically only receive the reflected light reflected by the fingerprint pattern directly above it, which can effectively improve image resolution Rate, thereby improving the fingerprint recognition effect.
  • the optical path guiding structure may be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses , which is used to converge the reflected light reflected from the finger to the sensing array 133 of the light detection part 134 below it, so that the sensing array 133 can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger .
  • Lens optical lens
  • the optical lens layer may further have a pinhole or a micro-aperture formed in the optical path of the lens unit, for example, one or more light-shielding sheets may be formed in the optical path of the lens unit, of which at least One light-shielding sheet may be formed with light-transmitting micro-holes in the optical axis or optical center area of the lens unit, and the light-transmitting micro-holes may serve as the aforementioned pinholes or micro-apertures.
  • the pinhole or micro-aperture diaphragm can cooperate with the optical lens layer and/or other optical film layers above the optical lens layer to expand the field of view of the optical fingerprint module 130 to improve the optical fingerprint module 130 Fingerprint imaging effect.
  • the light path guiding structure may be a micro lens array including a plurality of micro lenses, which may be formed by a semiconductor growth process or other processes
  • each microlens may correspond to one of the sensing units of the sensing array 133, respectively.
  • other optical film layers may be formed between the microlens layer and the sensing unit, such as a dielectric layer or a passivation layer.
  • a light blocking layer (or called a light blocking layer, a light blocking layer, etc.) with micro holes (or called openings) may also be included between the micro lens layer and the sensing unit, wherein the micro The hole is formed between the corresponding micro lens and the sensing unit, the light blocking layer can block the optical interference between the adjacent micro lens and the sensing unit, and make the light corresponding to the sensing unit converge through the micro lens To the inside of the micropore and transfer to the sensing unit through the micropore for optical fingerprint imaging.
  • a micro lens layer may be further provided above or below the collimator layer or the optical lens layer.
  • a micro lens layer may be further provided above or below the collimator layer or the optical lens layer.
  • the optical assembly 132 may also include other optical elements, such as filters or other optical films, which may be arranged between the optical path guiding structure and the optical fingerprint sensor or arranged at all.
  • the display screen 120 and the optical path guide structure are 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 that penetrates the finger and enters the optical fingerprint sensor through the display screen 120. Similar to the light path guiding structure, the filter layer can be specific to each The optical fingerprint sensors are separately arranged to filter out interference light, or a large-area filter layer can also be used to simultaneously cover the multiple optical fingerprint sensors.
  • the fingerprint identification module 140 can be used to collect user fingerprint information (such as fingerprint image information).
  • the optical fingerprint module 130 can use the display unit (ie, the OLED light source) of the OLED display 120 in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection.
  • the display unit ie, the OLED light source
  • the display screen 120 emits a beam of light 111 to the target finger 140 above the fingerprint detection area 103.
  • the light 111 is reflected on the surface of the finger 140 to form reflected light or pass through all the fingers.
  • the finger 140 scatters to form scattered light (transmitted light).
  • the above-mentioned reflected light and scattered light are collectively referred to as reflected light.
  • the ridge 141 and valley 142 of the fingerprint have different light reflection capabilities
  • the reflected light 151 from the fingerprint ridge and the reflected light 152 from the fingerprint valley have different light intensities, and the reflected light passes through the optical component 132. After that, it is received by the sensor array 133 in the optical fingerprint module 130 and converted into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby
  • the electronic device 10 realizes the optical fingerprint recognition function.
  • the optical fingerprint module 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection and identification.
  • the optical fingerprint module 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 optical fingerprint system of the electronic device 10 may also include an excitation light source for optical fingerprint detection.
  • the light source may specifically be an infrared light source or a light source of invisible light of a specific wavelength, which may be arranged under the backlight module of the liquid crystal display or arranged in the edge area under the protective cover of the electronic device 10, and the optical fingerprint module 130 can be arranged under the edge area of the liquid crystal panel or the protective cover and guided by the light path so that the fingerprint detection light can reach the optical fingerprint module 130; or, the optical fingerprint module 130 can also be arranged on the backlight module Below, and the backlight module is designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130 by opening holes or other optical designs on the film layers such as diffuser, brightness enhancement film, and reflective film. .
  • the optical fingerprint module 130 uses a built-in light source or an infrared light source or an infrared light source or an infrared light source or a light source of invisible light of a specific wavelength
  • the electronic device 10 may also include a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, which is located above the display screen 120 and covers the front surface of the electronic device 10 . Therefore, in the embodiments of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.
  • a transparent protective cover plate which may be a glass cover plate or a sapphire cover plate
  • the optical fingerprint module 130 may include only one optical fingerprint sensor.
  • the fingerprint detection area 103 of the optical fingerprint module 130 has a small area and a fixed position, so the user needs to press his finger when inputting a fingerprint. Go to the specific position of the fingerprint detection area 103, otherwise the optical fingerprint module 130 may not be able to collect fingerprint images, resulting in poor user experience.
  • the optical fingerprint module 130 may specifically include multiple optical fingerprint sensors. The multiple optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the sensing areas of the multiple optical fingerprint sensors together constitute the fingerprint detection area 103 of the optical fingerprint module 130.
  • the fingerprint detection area 103 of the optical fingerprint module 130 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation. Further, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 103 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.
  • the optical fingerprint module 130 in the electronic device 10 may include a plurality of optical fingerprint sensors, and the plurality of optical fingerprint sensors may be arranged side by side on the display screen 120 by means such as splicing. Below, and the sensing areas of the multiple optical fingerprint sensors collectively constitute the fingerprint detection area 103 of the optical fingerprint device 130.
  • the optical component 132 may include a plurality of light path guiding structures, and each light path guiding structure corresponds to an optical fingerprint sensor (that is, the sensing array 133), and is attached and arranged above the corresponding optical fingerprint sensor.
  • the multiple optical fingerprint sensors may also share an overall optical path guiding structure, that is, the optical path guiding structure has an area large enough to cover the sensing array of the multiple optical fingerprint sensors.
  • the optical sensor array of each optical fingerprint sensor may be One of the optical sensing units is configured with one or more collimating units, and is attached and arranged above the corresponding optical sensing unit.
  • the multiple optical sensing units can also share one collimating unit, that is, the one collimating unit has an aperture large enough to cover the multiple optical sensing units. Since one collimating unit can correspond to multiple optical sensing units or one optical sensing unit corresponds to multiple collimating units, the correspondence between the spatial period of the display screen 120 and the spatial period of the optical fingerprint sensor is destroyed.
  • the spatial structure of the light-emitting display array is similar to the spatial structure of the optical sensing array of the optical fingerprint sensor. It can also effectively prevent the optical fingerprint module 130 from using the light signal passing through the display 120 to perform fingerprint imaging to generate moiré fringes, which effectively improves the optical fingerprint model. Group 130 fingerprint recognition effect.
  • the optical fingerprint module 130 includes multiple sensor chips
  • one optical lens may be configured for each sensor chip to perform fingerprint imaging, or multiple sensor chips may be configured with one optical lens. Realize light convergence and fingerprint imaging. Even when a sensor chip has two sensing arrays (Dual Array) or multiple sensing arrays (Multi-Array), the sensor chip can also be equipped with two or more optical lenses to cooperate with the two sensing arrays or Multiple sensing arrays perform optical imaging, thereby reducing the imaging distance and enhancing the imaging effect.
  • FIGS. 1 to 4 are only examples of this application, and should not be construed as limiting the application.
  • this application does not specifically limit the number, size, and arrangement of fingerprint sensors, which can be adjusted according to actual needs.
  • the number of multiple fingerprint sensors of the optical fingerprint module 130 may be 2, 3, 4, or 5, etc., and the multiple fingerprint sensors may be distributed in a square or circular shape.
  • the embodiments of the present application can be applied to the detection of various types of fingers, and are particularly suitable for the detection of dry fingers.
  • the so-called dry fingers refer to dry fingers or clean fingers.
  • the current fingerprint recognition solution has a poor fingerprint recognition effect on dry fingers, and the fingerprint recognition solution provided by the embodiment of the present application can improve the fingerprint recognition performance on dry fingers.
  • FIG. 5 shows a schematic diagram of a fingerprint detection device 20 according to an embodiment of the present application.
  • the fingerprint detection device 20 may be applicable to the electronic device 10 shown in FIGS. 1 to 4, or the device 20 may be the optical fingerprint module 130 shown in FIGS. 1 to 5.
  • the fingerprint detection device 20 may include a microlens array 210, at least one light blocking layer, and an optical sensing pixel array 240.
  • the microlens array 210 may be used to be arranged under the display screen of an electronic device, the at least one light blocking layer may be arranged under the microlens array 210, and the optical sensing pixel array 240 may be arranged at all. Below the at least one light blocking layer. It should be noted that the microlens array 210 and the at least one light blocking layer may be the light guide structure included in the optical component 132 shown in FIG. 2 or FIG.
  • optical sensing pixel array 240 may be The sensing array 133 with a plurality of optical sensing units 131 (also referred to as optical sensing pixels, photosensitive pixels, pixel units, etc.) shown in FIG. 1 to FIG. 4 will not be repeated here to avoid repetition.
  • optical sensing units 131 also referred to as optical sensing pixels, photosensitive pixels, pixel units, etc.
  • the microlens array 210 includes a plurality of microlenses.
  • the micro lens array 210 may include a first micro lens 211, a second micro lens 212, and a third micro lens 213.
  • the at least one light blocking layer may include a plurality of light blocking layers, for example, the at least one light blocking layer may include a first light blocking layer 220 and a second light blocking layer 230.
  • the optical sensing pixel array 240 may include a plurality of optical sensing pixels.
  • the optical sensing pixel array may include a first optical sensing pixel 241, a second optical sensing pixel 242, a third optical sensing pixel 243, and a fourth optical sensing pixel. 244, the fifth optical sensing pixel 245 and the sixth optical sensing pixel 246.
  • the at least one light blocking layer is formed with a plurality of light guide channels corresponding to each micro lens in the micro lens array 210, and the bottoms of the plurality of light guide channels corresponding to each micro lens respectively extend to adjacent Below multiple micro lenses.
  • the first light blocking layer 220 and the second light blocking layer 230 are respectively provided with each of the plurality of microlenses (ie, the first microlens 211, the second microlens 212 and at least one opening corresponding to the third microlens 213).
  • the first light blocking layer 220 is provided with a first opening 221 and a second opening 222 corresponding to the first microlens 211
  • the first light blocking layer 220 is also provided with a first opening 221 and a second opening 222 corresponding to the second microlens 212.
  • the second opening 222 and the third opening 223, and the first light blocking layer 220 are provided with a third opening 223 and a fourth opening 224 corresponding to the third microlens 213.
  • the second light blocking layer 230 is provided with a fifth opening 231 and a sixth opening 232 corresponding to the first microlens 211, and the second light blocking layer 230 is also provided with a second microlens 212 corresponding to the The seventh opening 233 and the eighth opening 234, and the second light blocking layer 230 are provided with a ninth opening 235 and a tenth opening 236 corresponding to the third microlens 213.
  • the plurality of light guide channels corresponding to the second microlens 212 may include a light guide channel formed by a second opening 222 and a sixth opening 232, and a third opening
  • the hole 223 and the ninth opening 235 form a light guide channel.
  • the light guide channel formed by the second opening 222 and the sixth opening 232 extends below the first microlens 211, and the light guide channel formed by the third opening 223 and the ninth opening 235 extends to the third microlens 213 below.
  • an optical sensing pixel may be provided under each of the multiple light guide channels corresponding to each micro lens in the micro lens array 210.
  • a second optical sensing pixel 242 is provided below the light guide channel formed by the second opening 222 and the sixth opening 232, and the third opening 223 and the ninth opening
  • a fifth optical sensing pixel 245 is arranged under the light guide channel formed by 235.
  • a plurality of optical sensing pixels are arranged below each microlens in the microlens array 210.
  • the multiple optical sensing pixels arranged under each microlens are respectively used for receiving optical signals converged by adjacent multiple microlenses and transmitted through the corresponding light guide channel, and the optical signals are used for detecting fingerprints of fingers information.
  • a third optical sensing pixel 243 and a fourth optical sensing pixel 244 may be arranged below the second microlens 212, wherein the third optical sensing pixel 243 may be used for Receiving the oblique light signal converged by the first microlens 211 and transmitted through the light guide channel formed by the second opening 222 and the seventh opening 233, the fourth optical sensing pixel 244 can be used to receive the third microlens The oblique light signal converged by the lens 213 and transmitted through the light guide channel formed by the third opening 223 and the eighth opening 234.
  • the distribution of multiple optical sensing pixels under each microlens in the microlens array 210 may be polygonal.
  • the polygon includes but is not limited to a rectangle or a diamond.
  • the distribution of the multiple optical sensing pixels under each microlens in the microlens array 210 may be circular or elliptical.
  • microlenses in the microlens array are distributed in an array, when the distribution of the multiple optical sensing pixels under each microlens is polygonal, the correspondence between the microlens array and the optical sensing array can be effectively simplified. In this way, the structural design of the fingerprint detection device is simplified.
  • FIG. 6 is a schematic top view of the second microlens 212 shown in FIG. 5.
  • four optical sensing pixels may be disposed under the second microlens 212, and the distribution of the four optical sensing pixels may appear as a rectangle.
  • the embodiment of the present application does not limit the specific corresponding manner of each microlens and the lower optical sensing pixel.
  • the second microlens 212 may cover part or all of the photosensitive area (AA) of the third optical sensing pixel 243.
  • the first The two microlenses 212 can cover the light guiding area (PD area, AA) of the third optical sensing pixel 243, which is converged by the first microlens 211 and formed by the second opening 222 and the seventh opening 233 The area that the oblique light signal transmitted by the channel can irradiate to ensure that the third optical sensing pixel 243 can receive enough light signal to improve the fingerprint recognition effect.
  • the thickness of the fingerprint detection device is too large.
  • the size of the fingerprint detection device is too large.
  • each The multiple optical sensing pixels under each microlens can respectively receive the oblique light signal converged from multiple adjacent microlenses and transmitted through the corresponding light guide channel, and the oblique light signal is used to detect the fingerprint information of the dry finger.
  • the dry hand fingerprint is not in contact with the OLED screen, the contrast between the fingerprint ridge and the fingerprint valley of the fingerprint image in the vertical direction is poor, and the image is blurred to the point where the fingerprint lines cannot be distinguished.
  • This application uses a reasonable optical path design to allow the optical path to receive light signals in oblique directions , While it can better obtain normal finger fingerprints, it can better detect dry finger fingerprint images.
  • the fingers In normal life scenarios, such as washing hands, getting up in the morning, plastering fingers, low temperature and other scenes, the fingers are usually dry, and the stratum corneum is uneven. When it is pressed on the OLED screen, local areas of the fingers will have poor contact. The occurrence of this situation causes the current optical fingerprint solution to have a poor effect on dry hand fingerprint recognition.
  • the beneficial effect of this application is to improve the dry hand fingerprint imaging effect and make the dry hand fingerprint image clearer.
  • the optical sensing pixel array 240 can also expand the field of view and the field of view of the optical sensing pixel array 240 by receiving the tilt light signal.
  • the field of view of the fingerprint detection device 20 can be expanded from 6x9mm 2 to 7.5x10. .5mm 2 , further enhance the fingerprint recognition effect.
  • a plurality of optical sensing pixels are arranged under each microlens, so that the spatial period of the lens array 210 and the spatial period of the optical sensing pixel array 240 are not equal, thereby avoiding moiré fringes in the fingerprint image and improving fingerprint recognition effect.
  • Aiming at problem 2 by designing multiple light guide channels for each microlens, and making the bottoms of the multiple light guide channels corresponding to each microlens extend below the adjacent multiple microlenses, a single Imaging optical path with micro lens and multiple optical sensing pixels. That is, a single microlens can multiplex optical signals of multiple angles (for example, a single microlens can multiplex optical signals of 4 angles), which can split and image light beams with different object aperture angles, effectively improving The light input of the fingerprint detection device can reduce the exposure time of the optical sensing pixel array.
  • the aperture angle is the angle formed by the object point on the optical axis of the microlens and the effective diameter of the front lens of the microlens. The larger the aperture angle of the microlens, the greater the light input of the microlens.
  • the effective diameter of the lens is proportional and inversely proportional to the distance of the focal point.
  • the optical sensing pixel array may be divided into a plurality of optical sensing pixel groups, wherein each optical sensing pixel in each optical sensing pixel group is used for receiving the same direction as the light guide channel corresponding to the same optical sensing pixel group
  • the oblique light signal that is, each optical sensing pixel group can generate a fingerprint image based on the received oblique light signal, so the multiple optical sensing pixel groups can be used to generate multiple fingerprint images, in this case It is possible to superimpose the multiple fingerprint images to obtain a high-resolution fingerprint image, and then perform fingerprint identification based on this high-resolution fingerprint image.
  • the optical sensing pixel array 240 can converge oblique light signals to the optical sensing pixels under the adjacent multiple microlenses through the 4 light guide channels corresponding to each microlens, that is, the optical sensing pixels
  • the array 240 can be divided into 4 optical sensing pixel groups for forming 4 fingerprint images. Based on these 4 fingerprint images, a fingerprint image with a higher resolution can be obtained, thereby improving the fingerprint recognition effect.
  • each microlens can converge oblique light signals in multiple directions through multiple light guide channels, or the optical sensing pixel array can simultaneously acquire multiple fingerprint images through optical path design, even if the optical The exposure time of the sensing pixel array results in a lower resolution of each fingerprint image. It is also possible to process multiple fingerprint images with lower resolution to obtain a fingerprint image with higher resolution.
  • the imaging light path of a single microlens and multiple optical sensing pixels can perform non-frontal light imaging (ie, oblique light imaging) of the object beam of the fingerprint under the screen, especially the one arranged below each microlens
  • the multiple optical sensing pixels are respectively used to receive the optical signals converged by the adjacent multiple microlenses, thereby being able to enlarge the object-side numerical aperture of the optical system and shorten the optical path design of the optical sensing pixel array (that is, the at least one The thickness of the light-blocking layer) can ultimately effectively reduce the thickness of the fingerprint detection device.
  • the imaging light path with a single microlens and multiple optical sensing pixels can perform non-frontal light imaging of the object beam of the fingerprint under the screen, which can expand the object numerical aperture of the optical system and improve the robustness of the system And the tolerance tolerance of the fingerprint detection device 20.
  • the numerical aperture can be the product of the refractive index (h) of the medium between the front lens of the microlens and the object to be inspected and half of the aperture angle (u).
  • the imaging light path of a single microlens and multiple optical sensing pixels and the light guide channel provided in the at least one light blocking layer can improve the performance of the optical sensing pixels without affecting each other.
  • the density of the optical sensing pixels in the optical sensing pixel array 240 can further reduce the size of the fingerprint detection device.
  • the technical solution of the present application can make the optical sensing pixel array 240 only receive the light signal of the oblique angle through a reasonable design of the multiple light guide channels corresponding to each microlens, and converge multiple angles through a single microlens.
  • the oblique light signal solves the problem of too long exposure time for the single-object telecentric microlens array scheme.
  • the fingerprint detection device 20 can not only solve the problem of poor recognition of dry fingers by the vertical light signal and the long exposure time of the single-object telecentric microlens array solution, but also solve the problem of the fingerprint detection device. Problems with excessive thickness, poor tolerance tolerance, and excessive size.
  • the multiple light guide channels corresponding to each microlens in the microlens array 210 may be centrally symmetrically distributed along the optical axis direction of the same microlens.
  • the second microlens 212 corresponds to the light guide channel extending below the microlens in the upper right corner, and the second microlens 212 extends below the microlens in the lower left corner.
  • the light guide channel is symmetrical along the optical axis of the second microlens 212.
  • the second microlens 212 corresponds to the light guide channel extending below the microlens in the upper left corner and the second microlens 212 extends to the lower right microlens.
  • the light guide channel under the lens is symmetrical along the optical axis of the second microlens 212.
  • each light guide channel of the multiple light guide channels corresponding to each microlens in the microlens array 210 and the first plane may form a preset angle, so that each A plurality of optical sensing pixels arranged under the microlens are respectively used for receiving optical signals converged by a plurality of adjacent microlenses and transmitted through the corresponding light guide channel, wherein the first plane is parallel to the display screen Plane.
  • the preset included angle can ensure that the bottom ends of the multiple light guide channels corresponding to each microlens extend below the multiple adjacent microlenses of the same microlens.
  • the plane where the optical sensing pixel array 240 is located is parallel to the first plane, and the guide formed by the second opening 222 and the sixth opening 232
  • the light channel forms a first angle with the plane where the optical sensing pixel array 240 is located
  • the light guide channel formed by the third opening 223 and the ninth opening 235 forms a first angle with the plane where the optical sensing pixel array 240 is located.
  • Two angles. The first angle is equal to the second angle.
  • the first angle may not be equal to the second angle, which is not limited in the embodiment of the present application.
  • the preset angle may be the angle between the axis of the light guide channel and the first plane, or the angle between any straight line passing through the light guide channel and the first plane
  • the range of the preset angle may be any range from 0 degrees to 90 degrees, for example, the range of the preset angle may be 15 degrees to 60 degrees, or 10 degrees to 70 degrees, This application does not specifically limit this.
  • the projection of the multiple light guide channels corresponding to each microlens in the microlens array 210 on the first plane can be relative to the projection of the optical axis of the same microlens on the first plane.
  • the center is symmetrically distributed to ensure that each optical sensing pixel in the optical sensing pixel array can receive enough light signals, thereby improving the resolution of the fingerprint image and the fingerprint recognition effect.
  • each light guide channel is an inclined channel
  • the end surface of each light guide channel on the first plane is elliptical
  • the first plane The four light guide channels corresponding to the two microlenses 212 are symmetrically distributed along the optical axis of the second microlens 212 on the projection center of the first plane near the end surface of the optical sensing pixel array 340.
  • the fingerprint detection device 20 may include a plurality of light-blocking layers, and different light-blocking layers are provided with at least one opening corresponding to each microlens to form each microlens. Multiple light guide channels corresponding to the lens.
  • the at least one light blocking layer may include the first light blocking layer 220 and the second light blocking layer 230 described above with respect to FIG. 5.
  • the number of openings corresponding to the same microlens in different light blocking layers can be sequentially increased from top to bottom to form multiple light guide channels corresponding to each microlens.
  • the spacing between the openings in different light blocking layers decreases sequentially from top to bottom.
  • the distance D between two adjacent openings in the first light blocking layer 220 is greater than the distance d between two adjacent openings in the second light blocking layer 230 .
  • Most of the light signals that the fingerprint detection device does not expect to receive are blocked by the upper part of the light-blocking layer with a lower density of openings in the plurality of light-blocking layers, and the density of openings in the plurality of light-blocking layers is blocked
  • the smaller upper part of the light-blocking layer and the lower part of the light-blocking layer with a larger opening density can form multiple light guide channels for each microlens.
  • the preparation complexity of the at least one light-shielding layer can also be reduced and the strength of the upper part of the light-shielding layer can be increased.
  • a plurality of openings corresponding to each microlens may be provided in the bottom light blocking layer of the plurality of light blocking layers, and the plurality of light guide channels corresponding to each microlens respectively pass through A plurality of openings corresponding to the same micro lens in the bottom light blocking layer.
  • the non-bottom light-blocking layer of the plurality of light-blocking layers may be provided with an opening in the middle position of the back focus of two adjacent microlenses in the plurality of microlenses, and the two adjacent microlenses The two corresponding light guide channels both pass through the corresponding openings of the two adjacent microlenses in the non-bottom light blocking layer.
  • the top light-blocking layer of the multiple light-blocking layers may be provided with an opening on the optical axis of each microlens, and the multiple light guide channels corresponding to each microlens pass through the top-level block. The corresponding opening of the same micro lens in the optical layer.
  • FIG. 7 is another schematic structural diagram of the fingerprint detection device 20 according to an embodiment of the present application.
  • the fingerprint detection device 20 may include a third light blocking layer 260 in addition to the first light blocking layer 220 and the second light blocking layer 230 shown in FIG. 6, wherein the third blocking layer
  • the optical layer 260 includes an eleventh opening 261, a twelfth opening 262 and a thirteenth opening 263.
  • the second light blocking layer 230 is provided with a sixth opening 232 and a ninth opening 235 corresponding to the second micro lens 212.
  • the first light blocking layer 220 may be provided with a second opening 222 at an intermediate position between the back focus of the first microlens 211 and the back focus of the second microlens 212, and the first light blocking layer 220
  • a third opening 223 may be provided at an intermediate position between the back focus of the third microlens 213 and the back focus of the second microlens 212.
  • the third light blocking layer 260 may be provided with a twelfth opening 262 at a position close to the first light blocking layer 220 in the optical axis direction of the second microlens 260.
  • a light guide channel corresponding to the second microlens 212 passes through the twelfth opening 262, the second opening 222, and the sixth opening 232, and the other corresponding to the second microlens 212
  • the light guide channel passes through the twelfth opening, the third opening 223 and the ninth opening 235.
  • the apertures of the openings corresponding to the same microlens in different light-blocking layers can also be sequentially reduced from top to bottom, so as to filter out the optical signals expected to be received by the optical sensing pixel array 240.
  • each of the microlenses can image the oblique light signal in the openings of the bottom light-blocking layer of the plurality of light-blocking layers, thereby realizing micro-aperture imaging.
  • the aperture of the opening of the third light blocking layer 260 is larger than the aperture of the opening in the first light blocking layer 220, and the aperture of the opening in the first light blocking layer 220 is larger than The aperture of the opening in the second light blocking layer 230.
  • the fingerprint detection device 20 may also include only one light blocking layer.
  • the multiple light guide channels may be a plurality of inclined through holes corresponding to the same microlens in the one light blocking layer.
  • the thickness of the one light-blocking layer is greater than a preset threshold, so that the plurality of optical sensing pixels arranged under each microlens are respectively used to receive the light-blocking layer converged by the adjacent plurality of microlenses and pass through the corresponding guide.
  • the optical signal transmitted by the optical channel is greater than a preset threshold, so that the plurality of optical sensing pixels arranged under each microlens are respectively used to receive the light-blocking layer converged by the adjacent plurality of microlenses and pass through the corresponding guide. The optical signal transmitted by the optical channel.
  • the fingerprint detection device 20 may further include a transparent medium layer 250.
  • the transparent medium layer 250 may be disposed at at least one of the following positions: between the microlens array 210 and the at least one light blocking layer; between the at least one light blocking layer; and the at least one light blocking layer Layer and optical sensing pixel array 240.
  • the transparent medium layer 250 may include a first medium layer 251 located between the microlens array 210 and the at least one light blocking layer (that is, the first light blocking layer 220) and the first blocking layer The second medium layer 252 between the light layer 220 and the second light blocking layer 230.
  • the material of the transparent medium layer 250 is any transparent material that is transparent to light, such as glass, which can also be transitioned by air or vacuum, which is not specifically limited in this application.
  • FIG. 8 is another schematic structural diagram of the fingerprint detection device 20 according to an embodiment of the present application.
  • the fingerprint detection device 20 may further include a filter layer 270, and the filter layer 270 may be disposed at at least one of the following positions: above the micro lens array 210, the micro lens array 210 And the at least one light blocking layer; between the at least one light blocking layer; and between the at least one light blocking layer and the optical sensing pixel array 240.
  • the filter layer 270 may be disposed between the optical sensing pixel array 240 and the second light blocking layer 230.
  • the filter layer 270 may be the filter layer in the optical component 132 mentioned above.
  • the filter layer 270 is used to reduce undesired ambient light in fingerprint sensing, so as to improve the optical sensing of the optical sensing pixel array 240 to the received light.
  • the filter layer 270 may specifically be used to filter out light of a specific wavelength, for example, near-infrared light and part of red light. For example, human fingers absorb most of the energy of light with a wavelength below 580nm. If one or more optical filters or optical filter layers are designed to filter light with wavelengths from 580nm to infrared, it can greatly reduce the impact of ambient light on fingerprints. The influence of optical detection in induction.
  • the filter layer 270 may include one or more optical filters, and the one or more optical filters may be configured as, for example, band-pass filters to allow the transmission of light emitted by the OLED screen while blocking infrared rays in sunlight. Light and other light components. When the under-screen fingerprint detection device 20 is used outdoors, this kind of optical filtering can effectively reduce the background light caused by sunlight.
  • One or more optical filters may be implemented as, for example, an optical filter coating formed on one or more continuous interfaces, or may be implemented as one or more discrete interfaces. It should be understood that the filter layer 270 may be formed at any position along the optical path from the reflected light formed by the reflection of the finger to the optical sensing pixel array 240, which is not specifically limited in the embodiment of the present application.
  • the light entrance surface of the filter layer 270 may be provided with an optical inorganic coating or an organic blackened coating, so that the reflectance of the light entrance surface of the filter layer 270 is lower than a first threshold, such as 1%, so that It is ensured that the optical sensing pixel array 240 can receive sufficient light signals, thereby improving the fingerprint recognition effect.
  • a first threshold such as 1%
  • the filter layer 270 fixed on the upper surface of the optical sensing pixel array 240 by a fixing device as an example.
  • the filter layer 270 and the optical sensing pixel array 240 can be glued and fixed in the non-sensitizing area of the optical sensing pixel array 240, and the filter layer 270 and the photosensitive area of the optical sensing pixel array 240 There is a gap between.
  • the lower surface of the filter layer 270 is fixed on the upper surface of the optical sensing pixel array 240 by glue with a refractive index lower than a predetermined refractive index.
  • the predetermined refractive index includes but is not limited to 1.3.
  • the at least one light blocking layer and the microlens array 210 may be integrated, or the at least one light blocking layer and the optical sensing pixel array 240 may be integrated, or even
  • the microlens array 210, the at least one light blocking layer and the optical sensing pixel 240 are all integrated into one component.
  • each microlens in the microlens array 210 may satisfy at least one of the following conditions: the projection of the condensing surface of the microlens on a plane perpendicular to its optical axis is Rectangular or circular; the condenser surface of the microlens is spherical or aspherical; the curvature of the condenser surface of the microlens is the same in all directions; the microlens includes at least one lens; and the microlens The focal length range is 10um-2mm.
  • the microlens array 210 satisfies at least one of the following conditions: the microlens array 210 is arranged in a polygonal shape and the duty ratio of the microlens array 210 ranges from 100% to 50%. %.
  • the microlens array 210 is arranged in a square or hexagonal shape.
  • the duty cycle of the micro lens array 210 is 85%.
  • the period of the microlens array 210 is not equal to the period of the optical sensing pixel array 240, and the period of the microlens array 210 is the same as the period of the optical sensing pixel array 240.
  • the distance between the fingerprint detection device 20 and the display screen is 20um-1000um, so as to ensure that the fingerprint detection device 20 and the display screen have a sufficient safety distance, thereby ensuring that the The device vibrates or falls, causing the fingerprint detection device 20 to hit the display screen and cause damage to the device.
  • FIG. 1 to FIG. 8 are only examples of the present application, and should not be construed as limiting the present application.
  • the first light blocking layer 220 may also be provided with a plurality of openings corresponding to each microlens, wherein the plurality of light guide channels corresponding to each microlens respectively pass through the same microlens.
  • the lens corresponds to a plurality of openings in the first light blocking layer 220.
  • each microlens in the microlens array 210 may be filled with a circle or a square.
  • the material of each microlens in the microlens array 210 may be plastic or glass.
  • the production process of each microlens in the microlens array 210 can be realized by a micro-nano processing process or a compression molding process.
  • FIG. 9 is another schematic top view of the second microlens 212 shown in FIG. 5.
  • four microlenses may be disposed under the second microlens 212, and the distribution of the four microlenses may be a rhombus.
  • the embodiment of the present application also provides an electronic device, which may include a display screen and the fingerprint detection device of the above embodiment of the application, wherein the fingerprint detection device is arranged under the display screen to realize the screen Under optical fingerprint detection.
  • the electronic device can be any electronic device with a display screen.
  • the display screen may be the display screen described above, such as an OLED display screen or other display screens.
  • OLED display screen or other display screens.
  • the units can be implemented by electronic hardware, computer software, or a combination of both, in order to clearly illustrate the interchangeability of hardware and software.
  • the composition and steps of each example have been described generally in terms of function. 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.
  • the disclosed system and device may 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 can 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 also be electrical, mechanical or other forms of connection.
  • 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 of the present application.
  • 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 above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit 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 this application is essentially or the part that contributes to the existing technology, or all or 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 It includes several instructions 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 method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code .

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  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

L'invention concerne un appareil de détection d'empreintes digitales (20) et un dispositif électronique (10). L'appareil de détection d'empreintes digitales (20) est applicable à la partie inférieure d'un écran d'affichage (120) de manière à réaliser une détection d'empreintes digitales optique sous-écran, et comprend : un réseau de microlentilles (210) comprenant une pluralité de microlentilles ; au moins une couche de blocage de lumière disposée au-dessous du réseau de microlentilles (210) et formant une pluralité de canaux de guidage de lumière correspondant à chacune de la pluralité de microlentilles, les fonds de la pluralité de canaux de guidage de lumière correspondant à chaque microlentille s'étendant respectivement vers les parties inférieures d'une pluralité de microlentilles adjacentes ; et un réseau de pixels de détection optique (240) disposé au-dessous de la ou des couches de blocage de lumière, un pixel de détection optique étant disposé au-dessous de chacun de la pluralité de canaux de guidage de lumière correspondant à chaque microlentille. L'appareil de détection d'empreintes digitales (20) peut résoudre le problème d'un mauvais effet de reconnaissance d'un signal optique vertical sur un doigt sec et le problème d'un temps d'exposition excessivement long d'une solution de réseau de microlentilles télécentriques à espace objet unique, et peut également résoudre les problèmes d'une épaisseur importante de l'appareil de détection d'empreintes digitales, d'une mauvaise tolérance d'erreur admissible et d'une taille excessivement grande.
PCT/CN2019/095880 2019-07-12 2019-07-12 Appareil de détection d'empreintes digitales et dispositif électronique Ceased WO2021007730A1 (fr)

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CN201980004242.9A CN111095279B (zh) 2019-07-12 2019-07-12 指纹检测装置和电子设备
PCT/CN2019/095880 WO2021007730A1 (fr) 2019-07-12 2019-07-12 Appareil de détection d'empreintes digitales et dispositif électronique
EP19929178.2A EP3789913B1 (fr) 2019-07-12 2019-09-26 Appareil de détection d'empreintes digitales et dispositif électronique
CN201980004244.8A CN111108510B (zh) 2019-07-12 2019-09-26 指纹检测装置和电子设备
CN202110586440.XA CN113239856B (zh) 2019-07-12 2019-09-26 指纹检测装置和电子设备
KR1020207030945A KR102475288B1 (ko) 2019-07-12 2019-09-26 지문 검출 장치 및 전자 장치
PCT/CN2019/108223 WO2021007953A1 (fr) 2019-07-12 2019-09-26 Appareil de détection d'empreintes digitales et dispositif électronique
CN201921636356.9U CN210864747U (zh) 2019-07-12 2019-09-26 指纹检测装置和电子设备
CN201980004247.1A CN111108511B (zh) 2019-07-12 2019-10-14 指纹检测装置和电子设备
CN201921720097.8U CN210605739U (zh) 2019-07-12 2019-10-14 指纹检测装置和电子设备
PCT/CN2019/111103 WO2021007964A1 (fr) 2019-07-12 2019-10-14 Appareil de détection d'empreintes digitales et dispositif électronique
CN201980013671.2A CN111801679B (zh) 2019-07-12 2019-12-27 指纹检测装置和电子设备
CN201922451701.8U CN211180842U (zh) 2019-07-12 2019-12-27 指纹检测装置和电子设备
PCT/CN2019/129434 WO2021008088A1 (fr) 2019-07-12 2019-12-27 Appareil de détection d'empreintes digitales et dispositif électronique
US17/034,981 US11531430B2 (en) 2019-07-12 2020-09-28 Fingerprint detection apparatus and electronic device

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