WO2021042396A1 - Appareil de reconnaissance d'empreinte digitale et dispositif électronique - Google Patents

Appareil de reconnaissance d'empreinte digitale et dispositif électronique Download PDF

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Publication number
WO2021042396A1
WO2021042396A1 PCT/CN2019/104800 CN2019104800W WO2021042396A1 WO 2021042396 A1 WO2021042396 A1 WO 2021042396A1 CN 2019104800 W CN2019104800 W CN 2019104800W WO 2021042396 A1 WO2021042396 A1 WO 2021042396A1
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WIPO (PCT)
Prior art keywords
fingerprint
pixels
electrical signal
pixel
area
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PCT/CN2019/104800
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English (en)
Chinese (zh)
Inventor
丘芳芳
李华飞
杜灿鸿
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 CN201980004096.XA priority Critical patent/CN111052142B/zh
Priority to PCT/CN2019/104800 priority patent/WO2021042396A1/fr
Publication of WO2021042396A1 publication Critical patent/WO2021042396A1/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
    • 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; 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched

Definitions

  • This application relates to the field of optical fingerprint technology, and more specifically, to a fingerprint identification device and electronic equipment.
  • the fingerprint recognition device is set below a part of the display area of the screen, and its position is usually set according to the user's habitual pressing position on the screen, for example, set in the lower half of the screen.
  • the area of the fingerprint recognition device is generally larger than the area of the finger. Therefore, when performing fingerprint recognition, the fingerprint recognition device will receive interference in addition to the area where the fingerprint signal is received. Signal, causing misjudgment.
  • the embodiments of the present application provide a fingerprint identification device and electronic equipment, which can determine the fingerprint position pressed by a finger and improve the success rate of fingerprint identification.
  • a fingerprint identification device configured to be arranged under the display screen of an electronic device, and includes at least one fingerprint identification module.
  • the pixel array in the fingerprint identification module includes a plurality of first pixels. The first pixel is used to sense the red light signal when the finger presses the fingerprint detection area of the display screen; the red light signal is used to determine the fingerprint area where the finger presses on the fingerprint detection area, and the pixel corresponding to the fingerprint area The sensed light signal is used for fingerprint identification.
  • a plurality of first pixels can be set to sense the red light signal, and the fingerprint area and non-finger pressing on the display screen can be determined according to the difference of the red light signals received by different first pixels.
  • fingerprint recognition is directly performed on the light signals sensed by the pixels corresponding to the fingerprint area pressed by the finger, so as to avoid the interference caused by the pixels corresponding to the non-finger pressing area on fingerprint recognition, thereby improving the fingerprint The success rate of recognition.
  • the plurality of first pixels are used to sense the red light signal to form a plurality of first electrical signals;
  • the fingerprint identification device further includes: a processing unit for the plurality of first electrical signals The electrical signal is processed to determine the fingerprint area.
  • the plurality of first electrical signals include at least one first fingerprint electrical signal and at least one first non-fingerprint electrical signal, and the first fingerprint electrical signal is greater than the first non-fingerprint electrical signal;
  • the photosensitive area corresponding to the first pixel forming the first fingerprint electrical signal is located in the fingerprint area, and the photosensitive area corresponding to the first pixel forming the first non-fingerprint electrical signal is located in the non-fingerprint area on the fingerprint detection area .
  • the processing unit is configured to distinguish the at least one first fingerprint electrical signal and the at least one first non-fingerprint electrical signal in the plurality of first electrical signals to determine the fingerprint area.
  • the processing unit is configured to determine to compare the plurality of first electrical signals with a first threshold, and determine that electrical signals greater than or equal to the first threshold are the first fingerprint electrical signals; and/or , Comparing the plurality of first electrical signals with a first threshold, and determining that an electrical signal smaller than the first threshold is the first non-fingerprint electrical signal.
  • the first pixel forming the first fingerprint electrical signal is located below or diagonally below the fingerprint area.
  • the first fingerprint electrical signal is used for fingerprint identification, and the first non-fingerprint electrical signal is not used for fingerprint identification.
  • the fingerprint recognition module further includes: a plurality of red light filter units, the plurality of red light filter units are arranged above the plurality of first pixels, and are configured to transmit the red light Signal, filter out other light signals except the red light signal.
  • the wavelength range of the red light signal is ⁇ 1 to ⁇ 2 , where ⁇ 1 ⁇ 590 nm and ⁇ 2 ⁇ 750 nm.
  • the pixel array further includes a plurality of second pixels, and the plurality of second pixels are used to sense a non-red light signal when the finger presses the fingerprint detection area of the display screen; wherein, the The non-red light signal and the red light signal are used to determine the fingerprint area, and the light signal sensed by the first pixel and/or the second pixel corresponding to the fingerprint area is used for fingerprint recognition.
  • multiple first pixels can be provided to sense red light signals and multiple second pixels can sense non-red light signals, combining the red light signals received by different first pixels and the red light signals received by different second pixels.
  • the difference of the non-red light signal can more determine the fingerprint area pressed by the finger.
  • the light signals generated and received by the multiple second pixels are relatively large, which can improve the quality of the fingerprint image, which is beneficial to further improve the success rate of fingerprint recognition.
  • the non-red light signal includes one or more of a green light signal, a blue light signal, and a white light signal.
  • the multiple second pixels are used to sense the non-red light signal to form multiple second electrical signals; the processing unit is used to sense the multiple second electrical signals and the multiple The first electrical signal is processed to determine the fingerprint area.
  • the plurality of second electrical signals include at least one second fingerprint electrical signal and at least one second non-fingerprint electrical signal, and the second fingerprint electrical signal is smaller than the second non-fingerprint electrical signal;
  • the photosensitive area corresponding to the second pixel forming the second fingerprint electrical signal is located in the fingerprint area, and the photosensitive area corresponding to the second pixel forming the second non-fingerprint electrical signal is located in the non-fingerprint area on the fingerprint detection area .
  • the processing unit is configured to distinguish the at least one first fingerprint electrical signal and the at least one first non-fingerprint electrical signal among the multiple first electrical signals, and the multiple second electrical signals.
  • the at least one second fingerprint electrical signal and the at least one second non-fingerprint electrical signal in the signals are used to determine the fingerprint area.
  • the plurality of first electrical signals include a first target electrical signal generated by a first target pixel in the plurality of first pixels
  • the plurality of second electrical signals include a first target electrical signal generated by a first target pixel in the plurality of first pixels.
  • At least one second target electrical signal generated by at least one second target pixel, the at least one second target pixel is located around the first target pixel; the processing unit is used to compare the first target electrical signal with the at least one second target Electrical signal to determine whether the first target electrical signal and the at least one second target electrical signal are the first fingerprint electrical signal and the second fingerprint electrical signal, or whether they are the first non-fingerprint electrical signal and the second non-fingerprint electrical signal Fingerprint electrical signal.
  • the fingerprint recognition module further includes: a plurality of non-red light filter units, the plurality of non-red light filter units are arranged above the plurality of second pixels, and are configured to pass through the Non-red light signal, filter out other light signals except the non-red light signal.
  • the plurality of first pixels are uniformly or non-uniformly distributed in the pixel array.
  • the plurality of second pixels are uniformly or non-uniformly distributed in the pixel array.
  • the number of the plurality of first pixels is greater than or equal to the number of the plurality of second pixels.
  • the plurality of first pixels and the plurality of second pixels are arranged alternately.
  • the plurality of first pixels are arranged in multiple rows in the pixel array, and at least one row of second pixels are arranged between every two rows of first pixels; or, the plurality of first pixels are arranged in the pixel array.
  • the pixel array is arranged in multiple rows, and at least one row of second pixels is arranged between every two rows of first pixels.
  • the pixel array includes a plurality of unit areas, the photosensitive area of each of the plurality of unit areas is less than or equal to the fingerprint area, and each unit area includes at least one first pixel and At least one second pixel.
  • the fingerprint identification module further includes: an optical component, which is arranged between the display screen and the pixel array, and is used to guide the light signal when the finger presses the fingerprint detection area of the display screen Or converge to the pixel array.
  • the optical component includes at least one light-blocking layer and a microlens array, the at least one light-blocking layer is located under the microlens array, and is provided with a plurality of light-passing holes, and the pixel array is used for Receiving light signals converged to the plurality of light-passing apertures through the micro lens array and passing through the plurality of light-passing apertures.
  • the at least one fingerprint identification module is horizontally arranged side by side under the display screen.
  • an electronic device including a display screen and a fingerprint identification device as in the first aspect or any possible implementation of the first aspect, wherein the fingerprint identification device is disposed under the display screen.
  • the display screen is an organic light emitting diode OLED display screen, and the display screen includes a plurality of OLED light sources, wherein the fingerprint identification device uses at least part of the OLED light sources as excitation light sources for optical fingerprint detection.
  • the electronic device has good fingerprint identification performance, improves the fingerprint identification success rate, and improves the user experience.
  • FIG. 1 is a schematic diagram of the structure of an electronic device to which an embodiment of the present application is applied.
  • Fig. 2 is a schematic top view of a fingerprint identification device according to an embodiment of the present application.
  • Fig. 3 is a schematic structural diagram of a fingerprint identification device according to an embodiment of the present application.
  • Fig. 4 is a schematic top view of the fingerprint identification device shown in Fig. 3.
  • Fig. 5 is a schematic structural diagram of a fingerprint identification module according to an embodiment of the present application.
  • Fig. 6 is a schematic top view of the fingerprint identification module shown in Fig. 3.
  • Fig. 7 is a schematic structural diagram of another fingerprint identification module according to an embodiment of the present application.
  • Fig. 8 is a schematic structural diagram of another fingerprint identification module according to an embodiment of the present application.
  • Fig. 9 is a schematic top view of the fingerprint identification module shown in Fig. 8.
  • Fig. 10 is an arrangement of a pixel array according to an embodiment of the present application.
  • Fig. 11 is a schematic structural diagram of another fingerprint identification module according to an embodiment of the present application.
  • Figures 12a to 12d show four pixel array arrangements according to embodiments of the present application.
  • Figures 13a to 13b show another two pixel array arrangements according to embodiments of the present application.
  • Fig. 14 is another arrangement of a pixel array according to an embodiment of the present application.
  • Fig. 15 is a schematic structural diagram of another fingerprint identification module according to an embodiment of the present application.
  • Fig. 16 is a schematic structural diagram of another fingerprint identification module according to an embodiment of the present application.
  • Fig. 17 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • optical fingerprint systems including but not limited to optical fingerprint identification systems and products based on optical fingerprint imaging.
  • the embodiments of this application only take optical fingerprint systems as an example for illustration, but should not be implemented in this application.
  • the examples constitute any limitation, and the examples of this application are also applicable to other systems that use optical imaging technology.
  • the optical fingerprint system provided in the embodiments of this application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other electronic devices; more specifically, in the above electronic devices, fingerprint identification
  • the device may specifically be an optical fingerprint device, which may be arranged in a partial area or an entire area under the display screen, thereby forming an under-display optical fingerprint system.
  • the fingerprint identification device may be partially or fully integrated into the display screen of the electronic device, thereby forming an in-display optical fingerprint system.
  • the electronic device 10 includes a display screen 120 and an optical fingerprint device 130, wherein the optical fingerprint device 130 is disposed in a partial area under the display screen 120.
  • the optical fingerprint device 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131, and the area where the sensing array 133 is located or its sensing area is the fingerprint detection area 103 of the optical fingerprint device 130. As shown in FIG. 1, the fingerprint detection area 103 is located in the display area of the display screen 120.
  • the optical fingerprint device 130 can also be arranged in other positions, such as the side of the display screen 120 or the non-transmissive area at the edge of the electronic device 10, and at least part of the display area of the display screen 120 is designed through the optical path.
  • the optical signal is guided to the optical fingerprint device 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
  • the area of the fingerprint detection area 103 may be different from the area of the sensing array of the optical fingerprint device 130.
  • the optical fingerprint can be made The area of the fingerprint detection area 103 of the device 130 is larger than the area of the sensing array of the optical fingerprint device 130.
  • the fingerprint detection area 103 of the optical fingerprint device 130 can also be designed to be substantially the same as the area of the sensing array of the optical fingerprint device 130.
  • the electronic device 10 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 10.
  • the optical fingerprint device 130 includes a light detecting portion 134 and an optical component 132.
  • the light detecting portion 134 includes a sensing array and a reading circuit electrically connected to the sensing array.
  • Other auxiliary circuits which can be fabricated on a chip (Die) through a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor.
  • the sensing array is specifically a photodetector array, which includes a plurality of arrays distributed
  • the photodetector can be used as the above-mentioned optical sensing unit; the optical component 132 can be arranged above the sensing array of the light detecting part 134, and it can specifically include a light guide layer or a light path guide structure and other optical elements.
  • the light guide layer or light path guide structure is mainly used to guide the reflected light reflected from the surface of the finger to the sensing array 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 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 can be attached to the Above the chip, or part of the components of the optical assembly 132 are integrated into the above-mentioned chip.
  • the light guide layer or light path guiding structure of the optical component 132 has multiple implementation schemes.
  • the light guide layer may specifically be a collimator layer made on a semiconductor silicon wafer, which has multiple collimators.
  • the collimating unit can be specifically a small hole, 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 optical sensor unit below it, and the incident angle Excessive light is attenuated by multiple reflections inside the collimating unit, so each optical sensor unit can basically only receive the reflected light reflected by the fingerprint pattern directly above it, so the sensor array can detect the finger Fingerprint image.
  • the light guide layer or the light path guide structure may also 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 for The reflected light reflected from the finger is condensed to the sensing array of the light detection part 134 below it, so that the sensing array can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger.
  • the optical lens layer may further have a pinhole formed in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint device, so as to improve the fingerprint imaging effect of the optical fingerprint device 130.
  • the light guide layer or the light path guide structure may also specifically adopt a micro-lens (Micro-Lens) layer.
  • the micro-lens layer has a micro-lens array formed by a plurality of micro-lenses. The process is formed above the sensing array of the light detecting part 134, and each microlens may correspond to one of the sensing units of the sensing array, respectively.
  • other optical film layers may be formed between the micro lens layer and the sensing unit, such as a dielectric layer or a passivation layer. More specifically, a light blocking layer with micro holes may also be formed between the micro lens layer and the sensing unit. The micro-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 into the micro-hole through the micro-lens And it is transmitted to the sensing unit through the micro-hole for optical fingerprint imaging.
  • a microlens layer can be further provided under the collimator layer or the optical lens layer.
  • the collimator layer or the optical lens layer is used in combination with the micro lens layer, the specific laminated structure or optical path may need to be adjusted according to actual needs.
  • the display screen 120 may adopt a display screen with a self-luminous display unit, such as an organic light-emitting diode (OLED) display screen or a micro-LED (Micro-LED) display screen.
  • a self-luminous display unit such as an organic light-emitting diode (OLED) display screen or a micro-LED (Micro-LED) display screen.
  • the optical fingerprint device 130 may use the display unit (ie, OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as the excitation light source for optical fingerprint detection.
  • OLED light source the display unit of the OLED display screen 120 located in the fingerprint detection area 103.
  • 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 scattered inside the finger 140.
  • the scattered light is formed.
  • the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Since the ridge and valley 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. After the reflected light passes through the optical component 132, It is received by the sensor array 134 in the optical fingerprint device 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, so that the electronic device 10 Realize the optical fingerprint recognition function.
  • the optical fingerprint device 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection.
  • the optical fingerprint device 130 may be suitable for non-self-luminous display screens, such as liquid crystal display screens or other passively-luminous display screens.
  • the optical fingerprint system of the electronic device 10 may also include an excitation light source for optical fingerprint detection.
  • the optical fingerprint device 130 can be specifically an infrared light source or a light source of invisible light of a specific wavelength, which can 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 device 130 can be arranged with a liquid crystal panel or Under the edge area of the protective cover and guided by the light path so that the fingerprint detection light can reach the optical fingerprint device 130; or, the optical fingerprint device 130 can also be arranged under the backlight module, and the backlight module passes through the diffusion sheet, the brightness enhancement sheet,
  • the film layer such as the reflective sheet has holes or other optical designs to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint device 130.
  • the optical fingerprint device 130 adopts a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is the same as that described above.
  • the electronic device 10 further includes 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.
  • 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.
  • the electronic device 10 may further include a circuit board 150 disposed under the optical fingerprint device 130.
  • the optical fingerprint device 130 can be adhered to the circuit board 150 through adhesive, and is electrically connected to the circuit board 150 through soldering pads and metal wires.
  • the optical fingerprint device 130 can realize electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic device 10 through the circuit board 150.
  • the optical fingerprint device 130 can receive the control signal of the processing unit of the electronic device 10 through the circuit board 150, and can also output the fingerprint detection signal from the optical fingerprint device 130 to the processing unit or the control unit of the electronic device 10 through the circuit board 150 Wait.
  • the optical fingerprint device 130 may include only one optical fingerprint sensor.
  • the fingerprint detection area 103 of the optical fingerprint device 130 has a small area and a fixed position. Therefore, the user needs to perform fingerprint input Press the finger to a specific position of the fingerprint detection area 103, otherwise the optical fingerprint device 130 may not be able to collect fingerprint images, resulting in poor user experience.
  • the optical fingerprint device 130 may specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the sensing areas of the plurality of optical fingerprint sensors are common The fingerprint detection area 103 of the optical fingerprint device 130 is constituted.
  • the fingerprint detection area 103 of the optical fingerprint device 130 may include multiple sub-areas, and each sub-area corresponds to the sensing area of one of the optical fingerprint sensors, so that the fingerprint collection area 103 of the optical fingerprint device 130 can be extended to display
  • the main area of the lower half of the screen is extended to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation.
  • 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 sensing array in the optical fingerprint device may also be referred to as a pixel array
  • the optical sensing unit or sensing unit in the sensing array may also be referred to as a pixel unit.
  • optical fingerprint device in the embodiments of the present application may also be referred to as an optical fingerprint identification module, a fingerprint identification device, a fingerprint identification module, a fingerprint module, a fingerprint acquisition device, etc., and the above terms can be replaced with each other.
  • FIG. 2 shows a schematic top view of a fingerprint identification device 200.
  • the fingerprint identification device 200 is arranged under the display screen and can receive fingerprint light signals reflected, transmitted or scattered by the fingers, as well as the screen and external interference light signals.
  • the fingerprint identification device 200 includes:
  • the pixel array 210 includes a plurality of pixel units, and the plurality of pixel units may be the same as the sensing unit 131 in FIG. 1 and are uniformly arranged on the circuit board in an array. Moreover, the multiple pixel units are all the same pixel unit, that is, the multiple pixel units have the same structure, and receive and sense light signals in the same wavelength range. For example, the plurality of pixel units all receive and sense visible light signals in the wavelength band between 350 nm and 650 nm.
  • the first pixel unit 211 in the pixel array 210 is completely or partially located below the fingerprint area 202 pressed by the finger, and the pixel array 210
  • the second pixel unit 212 is located below the non-finger pressing area.
  • the light signal of the display screen is received by the first pixel unit 211 after being reflected, transmitted or scattered by the finger, and the second pixel unit 212 can also receive the light signal of the display screen or the light signal of external interference.
  • the wavelength ranges of the optical signals received by the two pixel units 212 are the same, and the intensity of the optical signals is not much different. Therefore, the signal values generated by the first pixel unit 211 and the second pixel unit 212 are also not much different. Therefore, during fingerprint recognition, the non-fingerprint image signal generated by the pixel unit under the non-finger pressing area will interfere with the fingerprint image signal generated by the pixel unit under the finger pressing area, thereby causing misjudgment of recognition.
  • an embodiment of the present application proposes a fingerprint identification device.
  • the specific pixel unit is used to determine the pressing area of the finger, so that during fingerprint recognition, only the pixels in the pressing area of the finger are determined.
  • the signal value of the unit is subjected to identification processing, and the signal value of the pixel unit in the non-finger pressing area is excluded, thereby eliminating signal interference in the non-finger pressing area, and improving the success rate of fingerprint recognition.
  • FIG. 3 and 4 are schematic structural diagrams of a fingerprint identification device 30 provided by an embodiment of the present application.
  • the fingerprint identification device 30 is configured to be installed under the display screen 120 of an electronic device.
  • the at least one fingerprint identification device 30 includes at least one fingerprint identification module 300.
  • the at least one fingerprint identification module 300 is horizontally arranged side by side under the display screen 120.
  • the number, size, and arrangement of fingerprint recognition modules shown in the figure are only examples, and can be adjusted according to actual needs.
  • the number of the plurality of fingerprint identification modules may be 2, 3, 4, 5, etc., and the plurality of fingerprint and fingerprint identification modules may be distributed in a square or circular shape.
  • the fingerprint identification device 30 includes one fingerprint identification module 300 will be described in detail. It should be understood that when the fingerprint identification device 30 includes multiple fingerprint identification modules 300, unless otherwise specified, Related technical solutions can refer to the following description.
  • FIG. 5 is a schematic structural diagram of a fingerprint identification module 300 provided by an embodiment of the present application.
  • FIG. 6 is a schematic top view of the fingerprint identification module 300 shown in FIG. 5.
  • the fingerprint identification module 300 includes: a pixel array 310, including a plurality of first pixels 311, and the plurality of first pixels 311 are used to sense when a finger presses the fingerprint detection area 201 of the display screen. Measure red light signal;
  • the red light signal is used to determine the fingerprint area 202 where the finger presses on the fingerprint detection area, and the light signal sensed by the pixel corresponding to the fingerprint area is used for fingerprint recognition.
  • the fingerprint detection area 201 is a sensing area of the pixel array 310, and the fingerprint detection area 201 may be located in the display area of the display screen. In other words, when a finger is pressed in the fingerprint detection area 201, the pixel array 310 can receive the light signal returned through the fingerprint detection area 201 and process the light signal.
  • the fingerprint detection area 201 of the fingerprint identification device 30 on the display screen is the sensing area of the pixel array 310 in the fingerprint identification module 300.
  • the fingerprint detection area 201 of the fingerprint identification device 30 on the display screen is the sensing area of the total pixel array 310 in the plurality of fingerprint identification modules 300.
  • the multiple first pixels 311 in the pixel array 310 are used to sense red light signals. Specifically, the multiple first pixels 311 only sense the red light signals and form corresponding electrical signals. , Without sensing light signals other than red light signals.
  • the plurality of first pixels 311 sense the red light signal, wherein the red light signal sensed by the first part of the first pixels 311 includes the red light signal reflected by the finger. , Transmit or scatter the returned red light signal, and the second part of the red light signal sensed by the first pixel except the first part does not include the red light signal returned by the finger reflection, transmission or scattering.
  • the first part of the first pixel that senses the red light signal returned by the reflection, transmission or scattering of the finger, thereby determining the sensing area of the first part of the first pixel It is the fingerprint area 202 of the finger, and the fingerprint area 202 is located in the fingerprint detection area 201.
  • the fingerprint area 202 may be a complete fingerprint area of a finger, or may be a fingerprint area of a part of a finger.
  • a fingerprint recognition module 300 When the finger is fully pressed on the upper area of a fingerprint recognition module 300, it can be detected by a fingerprint recognition module 300. The complete fingerprint area is determined.
  • one fingerprint recognition module 300 detects and determines part of the fingerprint area 202, and multiple fingerprint recognition modules 300 detect and determine the complete fingerprint area. Fingerprint area.
  • the optical signal sensed by the pixel corresponding to the fingerprint area 202 includes fingerprint information, and only the optical signal is used for fingerprint identification. However, the optical signals sensed by pixels corresponding to other areas outside the fingerprint area 202 do not include fingerprint information, and this part of the optical signals is not used for fingerprint identification.
  • a plurality of first pixels can be provided to sense the red light signal, and the fingerprint area pressed by the finger on the display screen can be determined according to the difference in the red light signal received by the different first pixels
  • the optical signal of the pixel corresponding to the fingerprint area pressed by the finger is directly subjected to fingerprint recognition processing in the area not pressed by the finger, so as to avoid the interference caused by the pixel corresponding to the non-finger pressing area on the fingerprint recognition , Thereby improving the success rate of fingerprint recognition.
  • the wavelength band of the red light signal may be a light signal band after natural light is scattered and/or transmitted by a finger.
  • the natural light may be natural light emitted by the display screen and/or natural light from the outside.
  • the red light signal can be a complete red waveband optical signal, for example, an optical signal with a wavelength between 590nm and 750nm, or it can also be an optical signal in a part of the red waveband, such as the red waveband.
  • the optical signal is a red light signal with any wavelength range or wavelength between 590nm and 750nm.
  • the finger 140 when the finger 140 is pressed on the fingerprint detection area 201 on the display screen 120, at least one of the first fingerprint pixels 3111 among the plurality of first pixels is used to sense the first fingerprint pixel 3111 that is reflected, scattered or transmitted by the finger.
  • the red light signal 301, the sensing area of the at least one first fingerprint pixel 3111 on the display screen is the fingerprint area 202.
  • the relative positional relationship between the at least one first fingerprint pixel 3111 and the fingerprint area 202 is related to the angle of the first red light signal 301 received by the at least one first fingerprint pixel 3111.
  • the at least one first fingerprint pixel 3111 when at least one first fingerprint pixel 3111 receives a vertical red light signal, the at least one first fingerprint pixel 3111 may be located directly under the fingerprint area 202.
  • the at least one first fingerprint pixel 3111 when the at least one first fingerprint pixel 3111 receives the oblique red light signal, the at least one first fingerprint pixel 3111 may be located obliquely below the fingerprint area 202.
  • the at least one first fingerprint pixel 3111 also receives and senses the second red light signal 302 in the screen light and/or external natural light.
  • At least one first non-fingerprint pixel 3112 is also included.
  • the sensing area of the at least one first non-fingerprint pixel 3112 is a non-fingerprint area except the fingerprint area 202 in the fingerprint detection area 201.
  • the at least one first non-fingerprint pixel 3112 does not receive the first red light signal 301 that is returned by the reflection, scattering or transmission of the finger, but receives the second red light signal 302 that senses screen light and/or external natural light.
  • the first fingerprint pixel 3111 and the first non-fingerprint pixel 3112 are not a fixed first pixel in the pixel array 310, but are defined according to the fingerprint area pressed by the finger The first pixel of the two categories.
  • the sensing area of the first fingerprint pixel 3111 is the fingerprint area pressed by the finger
  • the sensing area of the first non-fingerprint pixel 3112 is the non-fingerprint area.
  • the first pixel at a certain fixed position among the plurality of first pixels may be the first fingerprint pixel or the first non-fingerprint pixel.
  • the first fingerprint pixel 3111 receives the sensing first red light signal 301
  • the first non-fingerprint pixel 3112 does not receive the sensing first red light signal 301
  • the first red light signal 301 is transmitted and scattered by the finger.
  • the reflected light signal due to the influence of the finger, the light intensity of the first red light signal 301 is relatively strong.
  • the intensity of the light signal received by the first fingerprint pixel 3111 is greater than the light signal received by the first non-fingerprint pixel 3112 Intensity, thus, it is possible to distinguish the first fingerprint pixel 3111 that receives the first red light signal 301 from the first non-fingerprint pixel 3112 that does not receive the first red light signal 301 among the plurality of first pixels 311, It is determined that the sensing area corresponding to the first fingerprint pixel 3111, namely the fingerprint area 202, is obtained.
  • the plurality of first pixels 311 are used to sense the red light signal to form a plurality of first electrical signals, and the plurality of first electrical signals are processed to determine the fingerprint area 202.
  • the fingerprint identification device 30 may further include a processing unit 400.
  • the processing unit 400 is used to process the above-mentioned multiple first electrical signals to determine the fingerprint area 202.
  • the processing unit 400 may be located in the fingerprint recognition module 300, and each fingerprint recognition module 300 includes a processing unit, or multiple fingerprint recognition modules 300 may be connected to the same processing unit 400, and multiple fingerprint recognition modules 300 may be connected to the same processing unit 400.
  • the electrical signals generated by the modules are all processed by the processing unit 400.
  • the processing unit 400 may be a processor in a fingerprint identification device, or may also be a processor in an electronic device where the fingerprint identification device is located, which is not limited in the embodiment of the present application.
  • the first fingerprint pixel 3111 senses the red light signal to obtain the first fingerprint electrical signal among the plurality of first signals
  • the first non-fingerprint pixel 3112 senses the red light signal to obtain the first non-fingerprint signal among the plurality of first signals.
  • the electrical signal Since the red light signal sensed by the first fingerprint pixel 3111 includes the first red light signal 301, the first fingerprint electrical signal is greater than the first non-fingerprint electrical signal.
  • the processing unit 400 may determine the fingerprint area 202 by distinguishing the first fingerprint electrical signal from the first non-fingerprint electrical signal. Only perform fingerprint recognition processing on the first fingerprint electrical signal of the first fingerprint pixel 3111, and not perform fingerprint recognition processing on the first non-fingerprint electrical signal of the first non-fingerprint pixel 3112, that is, only the electrical signal corresponding to the fingerprint area pressed by the finger Perform fingerprint recognition processing, instead of performing fingerprint recognition processing on the electrical signals corresponding to the non-finger pressing area.
  • the processing unit 400 compares the multiple first electrical signals generated by the multiple first pixels 311 from sensing the red light signal with a preset first threshold, where the multiple first electrical signals An electrical signal greater than or equal to a first threshold in an electrical signal is the first fingerprint electrical signal, the first pixel generating the first fingerprint electrical signal is the first fingerprint pixel 3111, and the corresponding sensing area is the fingerprint area 202.
  • the electrical signal of the plurality of first electrical signals that is less than or equal to the first threshold is the first non-fingerprint electrical signal, and the first pixel that generates the first non-fingerprint electrical signal is the first non-fingerprint pixel 3112, and its corresponding sensing area is Non-fingerprint area.
  • the first pixel corresponding to the fingerprint area 202 is the first fingerprint pixel, and the first fingerprint electrical signal generated by it is greater than the first non-fingerprint electrical signal generated by the first non-fingerprint pixel, and the processing unit It is used to distinguish different first fingerprint electrical signals from first non-fingerprint electrical signals, and the specific distinguishing algorithm is not limited in the embodiment of the present application.
  • the first pixel 311 for sensing the red light signal includes a photodiode (PD), which receives and responds to the red light signal, and converts the light intensity of the red light signal into an electrical signal.
  • PD photodiode
  • the photodiode in the first pixel 311 can only respond to the red light signal and generate a corresponding electrical signal, but cannot respond to other wavelength band optical signals except the infrared signal and generate an electrical signal.
  • the first pixel 311 may be processed by doping inside the photodiode through a semiconductor process, so as to only respond to red light signals and not respond to other light signals. Photodiode.
  • the fingerprint recognition module 300 further includes a filter layer 330, and the filter layer 330 includes a plurality of red light filter units 331, and the plurality of red light filter units 331
  • the light filter unit 331 corresponds to the plurality of first pixels 311 one-to-one, and is respectively located above the plurality of first pixels 311, and the plurality of red light filter units 331 are used to pass the red light signal and filter out the infrared signal. Other optical signals.
  • the filter layer 300 may be provided as a whole above the pixel array of the plurality of fingerprint identification modules 300, or each fingerprint identification module 300 may Including its separate filter layer 300, multiple filter layers of multiple fingerprint identification modules 300 are spliced and arranged above the pixel array.
  • the multiple red light filter units 331 are used to pass red light signals between 590 nm and 750 nm, or can also be used to pass red light signals at any wavelength range or wavelength between 590 nm and 750 nm.
  • the multiple red light filter units 331 may be arranged at any position on the optical path between the display screen 120 and the first pixel 311.
  • the plurality of red light filter units 331 may be arranged on the upper surface of the plurality of first pixels 311, or arranged on the lower surface of the display screen, or arranged on the upper surface of the first pixel and the lower surface of the display screen.
  • the embodiment of the present application does not limit this.
  • the multiple red light filter units 312 are located between the lower surface of the display screen and the upper surface of the multiple first pixels, optionally, when the multiple first pixels 311 receive the red light signal in the vertical direction, the multiple red light
  • the filtering unit 331 may be located directly above the plurality of first pixels 311, in other words, each of the plurality of red light filtering units is located directly above the corresponding first pixel 311, respectively.
  • the plurality of first pixels 311 may be located obliquely above the plurality of first pixels 311.
  • all the pixels in the pixel array 310 are the first pixels 311, and the red light signal is sensed.
  • the pixel array 310 includes a plurality of second pixels 312 in addition to a plurality of first pixels 311.
  • the plurality of second pixels 312 may be used to sense a non-red light signal when a finger presses the fingerprint detection area of the display screen, and the non-red light signal may be any visible light signal with a wavelength range different from the foregoing red light signal.
  • the plurality of second pixels 312 may have the same pixel structure, and sense light signals in the same wavelength band.
  • the plurality of second pixels 312 are all used to sense white light signals in a wide wavelength range, for example, the visible light wavelength range from 350 nm to 700 nm.
  • the intensity of the optical signal sensed by the plurality of second pixels 312 is relatively large, and therefore, the intensity of the electrical signal generated by the plurality of second pixels is relatively large, which can improve the quality of fingerprint images, which is beneficial to further improve the success rate of fingerprint recognition. .
  • the plurality of second pixels 312 may also be used to sense green light signals or blue light signals.
  • the green light signal and the blue light signal here may be a complete green waveband light signal or a blue waveband light signal, for example, a green light signal with a wavelength between 490nm and 570nm or a blue light signal between 450nm and 475nm, Or it can be an optical signal in the green band or part of the blue band.
  • the green signal is a green signal in any wavelength range or wavelength between 490nm and 570nm
  • the blue signal is any wavelength between 450nm and 475nm. Band range or green light signal of any wavelength.
  • the plurality of second pixels 312 may also have different pixel structures, and sense light signals of different wavelength bands.
  • a part of the plurality of second pixels 312 are used to sense blue light signals, and another part of the pixels are used to sense green signals;
  • a part of the plurality of second pixels 312 is used for sensing blue light signals, and another part of the pixels is used for sensing white light signals;
  • a part of the pixels in the plurality of second pixels 312 are used for sensing the green light signal, and the other part of the pixels are used for sensing the white light signal;
  • some of the plurality of second pixels 312 are used for sensing blue light signals, some of the pixels are used for sensing green light signals, and some of the pixels are used for sensing white light signals.
  • pixels in the plurality of second pixels can also sense light signals in any wavelength band within the visible light band, for example, yellow light signals, purple light signals, etc., which are not limited in the embodiment of the present application.
  • the following takes multiple second pixels for sensing blue light signals as an example.
  • the multiple second pixels 312 At least one second fingerprint pixel 3121 in is used to sense the first blue light signal 303 returned after being reflected, scattered or transmitted by the finger, and the sensing area of the at least one second fingerprint pixel 3121 on the display screen is the fingerprint area 202.
  • the light intensity of the first blue signal 303 returned after the reflection, scattering or transmission by the finger is very small .
  • the second fingerprint pixel 3121 In addition to receiving the first blue light signal 303 for sensing, the second fingerprint pixel 3121 also receives the second blue light signal 304 for sensing screen light and/or external natural light.
  • the plurality of second pixels 312 When a finger is pressed on the display screen 120, in addition to the second fingerprint pixel 3121, the plurality of second pixels 312 also include a second non-fingerprint pixel 3122, which does not receive the reflection or scattering of the finger. Or the first blue light signal 303 transmitted and returned, and the second blue light signal 304 in the sensed screen light and/or external natural light is received. Therefore, the second fingerprint pixel 3121 and the second non-fingerprint pixel 3122 receive the sensed blue light signal, and the light intensity value is closer.
  • the second non-fingerprint pixel 3122 may receive the blue signal reflected by an external interference object, and the intensity of the blue signal reflected by the interference object may be greater than the intensity of the second blue signal after absorption by the finger. Therefore, the intensity of the blue signal received by the second non-fingerprint pixel 3122 may be greater than the intensity of the blue signal received by the second fingerprint pixel 3121.
  • the second non-fingerprint electrical signal generated by the second non-fingerprint pixel 3122 may be greater than the second fingerprint electrical signal generated by the second fingerprint pixel 3121.
  • the plurality of first pixels 311 and the plurality of second pixels 312 may be alternately distributed.
  • the processing unit 400 may process the multiple first electrical signals generated by the multiple first pixels 311 and the multiple second electrical signals generated by the multiple second pixels 312 to determine the fingerprint area.
  • the processing unit 400 may distinguish the first fingerprint electrical signal and the first non-fingerprint electrical signal in the plurality of first electrical signals, and the second fingerprint electrical signal and the second non-fingerprint electrical signal in the plurality of second electrical signals. Fingerprint electrical signal to determine the fingerprint area.
  • the first fingerprint electrical signal and/or the second fingerprint electrical signal are used for fingerprint identification, and the first non-fingerprint electrical signal and the second non-fingerprint electrical signal are not used for fingerprint identification.
  • the fingerprint area 202 pressed by the finger can be more determined.
  • the signal value of the second fingerprint electrical signal is relatively large, which is beneficial for improving the contrast of the fingerprint image and improving the success rate of fingerprint recognition.
  • the plurality of first pixels 311 include a first target pixel 3101
  • the plurality of second pixels 312 include a second target pixel 3201, a second target pixel 3202, and a second target pixel 3202.
  • the four second target pixels are adjacent to the first target pixel and are respectively located above, left, below and right of the first target pixel 3101.
  • the first target electrical signal generated by the first target pixel 3101 is compared with the second target electrical signals generated by the four second target pixels, for example, the difference between the first target electrical signal and the four second target electrical signals is calculated respectively .
  • the processing unit 400 is used to determine whether the first target electrical signal and the four second target electrical signals are the first fingerprint electrical signal and the second fingerprint electrical signal, or whether the first target electrical signal is the first fingerprint electrical signal and the second fingerprint electrical signal according to the comparison result, for example, the difference value.
  • the fingerprint electrical signal and the second non-fingerprint electrical signal are used to determine whether the first target pixel and the four second target pixels are the first fingerprint pixel and the second fingerprint pixel, and whether the sensing area is a fingerprint area.
  • a filter unit for passing a green light signal, a blue light signal or a visible light signal may be provided above the second pixel.
  • the photodiode in the second pixel is a photodiode that responds to a green light signal, a blue light signal, or a wide-band visible light signal.
  • the filter layer 330 includes a plurality of corresponding red light filter units 331 and a plurality of corresponding non-red light filters.
  • Light filtering unit 332 if the pixel array 310 includes a plurality of first pixels 311 and a plurality of second pixels 312, the filter layer 330 includes a plurality of corresponding red light filter units 331 and a plurality of corresponding non-red light filters.
  • Light filtering unit 332 if the pixel array 310 includes a plurality of first pixels 311 and a plurality of second pixels 312, the filter layer 330 includes a plurality of corresponding red light filter units 331 and a plurality of corresponding non-red light filters.
  • the plurality of red light filter units 331 may be located in the first filter layer, and the plurality of non-red light filter units 332 may be located in the second filter layer.
  • the first filter layer and the second filter layer may be located on the same horizontal plane or on different horizontal planes, which is not limited in the embodiment of the present application.
  • the multiple red light filter units 331 and the multiple non-red light filter units 332 are all located in the filter layer on the same horizontal plane.
  • the filter layer 330 may be located at any position in the light path from the lower surface of the display screen 120 to the upper surface of the pixel array 310.
  • the filter layer 330 may be a filter film grown on the surface of the pixel array 310.
  • the surface of the first pixel 311 corresponds to the growth of a red light filter film
  • the surface of the second pixel 312 corresponds to the growth of a non-red light filter. Light film.
  • the filter layer 330 may also be a filter, which is disposed between the lower surface of the display screen 120 and the upper surface of the pixel array 310.
  • the pixel array 310 includes a plurality of first pixels 311 and a plurality of second pixels 312, and the plurality of second pixels have the same pixel structure, it is illustrated that the plurality of first pixels 311 and the plurality of second pixels 312 are in the pixel array. 310 in the arrangement.
  • the plurality of first pixels 311 and the plurality of second pixels 312 are uniformly arranged in the pixel array 310.
  • the numbers of the plurality of first pixels 311 and the plurality of second pixels 312 are equal.
  • the plurality of first pixels 311 and the plurality of second pixels 312 are arranged at intervals from each other.
  • the top, bottom, left, and right sides of each first pixel are second pixels, and the top, bottom, left, and right sides of each second pixel are first pixels.
  • the plurality of first pixels 311 and the plurality of second pixels 312 are arranged at intervals of multiple columns or arranged at intervals of multiple rows.
  • the number of the plurality of first pixels 311 and the plurality of second pixels 312 may also be unequal.
  • the number of the first pixels 311 is greater than the number of the second pixels 312. At this time, it is easier to determine the fingerprint area in the fingerprint detection area by sensing the red light signal through more first pixels 311. The determined fingerprint area is more accurate.
  • the number of the first pixels 311 is less than the number of the second pixels 312.
  • the white light signal, the blue light signal or the green light signal is sensed by more second pixels 312, and the fingerprint area is determined
  • the intensity of the light signal received and sensed by the pixel array 310 can be increased, the quality of the fingerprint signal, and the accuracy of fingerprint recognition can be improved.
  • the second pixel 312 in the above figure is marked with a pattern, but it does not mean that the second pixels marked by the same pattern have the same pixel structure. In fact, multiple second pixels 312 may be different
  • the pixel structure receives and senses light signals of different wavelength bands.
  • FIGS. 13a and 13b Two types of pixel arrays are shown in FIGS. 13a and 13b, where the second pixel 312 includes pixels for sensing two types of light signals, and the two types of pixels are represented by different graphic marks.
  • the first pixels 311 are arranged in multiple columns, and a column of second pixels for sensing blue light signals and a column of second pixels for sensing green light signals are arranged between every two columns of first pixels 311. .
  • every two first pixels 311 are not adjacent to each other, a plurality of second pixels 312 are distributed around each first pixel 311, and the plurality of second pixels 312 respectively receive sensing Different light signals, for example, blue light signal and green light signal.
  • the plurality of first pixels 311 and the plurality of second pixels 312 may also be arranged unevenly in the pixel array 310, but are randomly distributed in the pixel array 310.
  • the pixel array 310 includes a plurality of unit areas, each of the plurality of unit areas has a photosensitive area less than or equal to the fingerprint area 202, and each unit area includes at least one first pixel and at least one second pixel.
  • the pixel corresponding to the fingerprint area 202 of a finger is a pixel matrix of M times N (M ⁇ N) size, and M and N are positive integers.
  • the sensing area of the M ⁇ N pixel matrix can cover the fingerprint area 202.
  • the pixel array 310 is divided into a plurality of unit areas, each unit area is an M ⁇ N pixel array, or an A ⁇ B pixel array, where A ⁇ M, B ⁇ N, A, B are also positive integers .
  • Each unit area includes at least one first pixel 311 and at least one second pixel 312.
  • FIG. 14 shows a schematic diagram of a non-uniform arrangement of a plurality of first pixels 311 and a plurality of second pixels 312.
  • the plurality of first pixels 311 and the plurality of second pixels 312 are not concentrated in one area, but are widely distributed in a plurality of areas in the pixel array.
  • the first and second pixels are distributed around the periphery and center of the pixel array. . In this way, the multiple first pixels and the multiple second pixels can better cooperate to distinguish the fingerprint area pressed by the finger.
  • FIG. 15 shows a schematic structural diagram of another fingerprint identification module 300.
  • the fingerprint identification module 300 further includes:
  • the optical component 340 is disposed between the above-mentioned display screen 120 and the pixel array 310, and is used to guide or condense the light signal to the pixel array 310 when a finger presses the fingerprint detection area of the display screen 120.
  • the optical component 340 may correspond to the optical component 132 in FIG. 1.
  • details are not repeated here.
  • the optical component 340 may specifically include a light guide layer or light path guiding structure and other optical elements.
  • the light guide layer or light path guiding structure is mainly used to guide the reflected light reflected from the finger surface to the pixel array 310 for optical inspection. .
  • the optical component 340 and the pixel array 310 can be packaged in an optical fingerprint recognition chip, or the optical component 340 can be arranged outside the optical fingerprint chip, for example, the optical component 340 can be attached to the top of the optical fingerprint chip, or Some components of the optical assembly 340 are integrated in the optical fingerprint chip.
  • the above-mentioned optical component 340 includes: at least one light blocking layer 342 and a micro lens array 341;
  • the at least one light-blocking layer 342 is provided with a plurality of light-passing holes
  • the microlens array 341 is disposed above the at least one light-blocking layer 342, and is used to converge the fingerprint light signals reflected, scattered or transmitted by the finger to the at least one light-blocking layer 342 when the finger is pressed against the display screen.
  • the fingerprint light signal is transmitted to the pixel array 310 through the plurality of light-passing holes of at least one light-blocking layer 342.
  • the fingerprint light signal includes a red light signal and a non-red light signal, the first pixel senses the red light signal therein, and the second pixel senses the non-red light signal.
  • the at least one light-blocking layer 342 can be formed by semiconductor process growth or other processes, for example, a thin film of non-transparent material is prepared by atomic layer deposition, sputtering coating, electron beam evaporation coating, ion beam coating, etc., and then a small hole is formed. Pattern lithography and etching to form multiple light-passing holes.
  • the at least one light-blocking layer 342 can block the optical interference between adjacent microlenses, and make the light signal corresponding to the pixel unit converge into the light-passing hole through the micro-lens and be transmitted to the pixel array 310 through the light-passing hole. Pixels for optical fingerprint imaging.
  • the microlens array 341 is formed of a plurality of microlenses, which may be formed on the at least one light blocking layer 342 through a semiconductor growth process or other processes, and each microlens may correspond to one pixel of the pixel array 310 respectively.
  • the filter layer 330 is disposed in the optical path between the display screen 120 and the optical component 340.
  • a buffer layer 343 is provided above the microlens array 341.
  • the buffer layer is a transparent medium buffer layer, and its optical refractive index is lower than that of the microlens array 341.
  • the optical refractive index of the buffer layer 343 is Below 1.3.
  • the lower surface of the filter layer 330 is completely attached to the upper surface of the buffer layer 343 through the adhesive layer 344.
  • the adhesive layer 343 may be a low refractive index glue, and the refractive index of the low refractive index glue is less than 1.25.
  • the filter layer 330 can also be fixed above the microlens array 341 by a fixing device, for example, a sealant or other support is provided in the non-photosensitive area around the microlens array 341 to support and fix the filter layer 330 in place.
  • a fixing device for example, a sealant or other support is provided in the non-photosensitive area around the microlens array 341 to support and fix the filter layer 330 in place.
  • the filter layer 330 may also be disposed in the light path between the micro lens array 341 and the pixel array 310. Specifically, the filter layer 330 may be disposed between the light blocking layer 342 and the pixel array 310, for example, as shown in FIG. 16 As shown, at least one light blocking layer 342 is formed above the filter layer 330, and the filter layer 330 is disposed above the pixel array 310.
  • the filter layer 330 can be formed by coating on the pixel array 310 by an evaporation process, for example, a layer of filter layer is prepared on the pixel array by methods such as atomic layer deposition, sputtering coating, electron beam evaporation coating, ion beam coating, etc.
  • a layer of filter layer is prepared on the pixel array by methods such as atomic layer deposition, sputtering coating, electron beam evaporation coating, ion beam coating, etc.
  • Optical material film Optical material film.
  • the embodiment of the present application also provides an electronic device.
  • the electronic device 40 may include a display screen 410 and a fingerprint identification device 420, wherein the fingerprint identification device 420 is disposed under the display screen 410.
  • the fingerprint identification device 420 may be the fingerprint identification device 30 in the above-mentioned embodiment, and the specific structure may refer to the relevant description in the foregoing, which will not be repeated here.
  • the display screen 410 may specifically be a self-luminous display (such as an OLED display), and it includes a plurality of self-luminous display units (such as an OLED pixel or an OLED light source).
  • the optical image acquisition system is a biological feature recognition system
  • part of the self-luminous display unit in the display screen can be used as an excitation light source for the biological feature recognition system to perform biological feature recognition, and is used to emit light signals to the biological feature detection area for use in biological features.
  • Feature detection part of the self-luminous display unit in the display screen can be used as an excitation light source for the biological feature recognition system to perform biological feature recognition, and is used to emit light signals to the biological feature detection area for use in biological features. Feature detection.
  • the processing unit in the embodiment of the present application may be a processor in a fingerprint identification device or a processor of an electronic device where the fingerprint identification device is located.
  • the processor may be an integrated circuit chip with signal processing capability.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the fingerprint identification device of the embodiment of the present application may further include a memory
  • the memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • Synchronous DRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Double Data Rate SDRAM Double Data Rate SDRAM
  • DDR SDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Enhanced SDRAM Enhanced SDRAM, ESDRAM
  • Synchronous Link Dynamic Random Access Memory Synchronous Link Dynamic Random Access Memory
  • DR RAM Direct Rambus RAM
  • the disclosed system and device may be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • 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 prior art 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.
  • a computer device which may be a personal computer, a server, or a network device, etc.
  • 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 disk or optical disk and other media that can store program code .

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Abstract

La présente invention concerne un appareil de reconnaissance d'empreinte digitale et un dispositif électronique, qui sont aptes à déterminer la position d'une empreinte digitale pressée par un doigt, améliorant le taux de réussite de la reconnaissance d'empreinte digitale. L'appareil de reconnaissance d'empreinte digitale est configuré pour être disposé sous l'écran d'affichage d'un dispositif électronique. Ledit appareil comprend au moins un module de reconnaissance d'empreinte digitale, et un réseau de pixels dans le module de reconnaissance d'empreinte digitale comprend une pluralité de premiers pixels, la pluralité de premiers pixels étant utilisés pour détecter un signal de lumière rouge lorsqu'un doigt presse une zone de détection d'empreinte digitale de l'écran d'affichage, le signal de lumière rouge étant utilisé pour déterminer une zone d'empreinte digitale pressée par le doigt sur la zone de détection d'empreinte digitale, et un signal optique détecté par un pixel correspondant à la zone d'empreinte digitale étant utilisé pour la reconnaissance d'empreinte digitale.
PCT/CN2019/104800 2019-09-06 2019-09-06 Appareil de reconnaissance d'empreinte digitale et dispositif électronique WO2021042396A1 (fr)

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CN201980004096.XA CN111052142B (zh) 2019-09-06 2019-09-06 指纹识别装置和电子设备
PCT/CN2019/104800 WO2021042396A1 (fr) 2019-09-06 2019-09-06 Appareil de reconnaissance d'empreinte digitale et dispositif électronique

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