WO2021042248A1 - Procédé et appareil de détection d'empreintes digitales, et dispositif électronique - Google Patents

Procédé et appareil de détection d'empreintes digitales, et dispositif électronique Download PDF

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Publication number
WO2021042248A1
WO2021042248A1 PCT/CN2019/104069 CN2019104069W WO2021042248A1 WO 2021042248 A1 WO2021042248 A1 WO 2021042248A1 CN 2019104069 W CN2019104069 W CN 2019104069W WO 2021042248 A1 WO2021042248 A1 WO 2021042248A1
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WIPO (PCT)
Prior art keywords
mode
light
light source
fingerprint
optical
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Application number
PCT/CN2019/104069
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English (en)
Chinese (zh)
Inventor
徐波
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深圳市汇顶科技股份有限公司
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Priority to PCT/CN2019/104069 priority Critical patent/WO2021042248A1/fr
Priority to CN201980001860.8A priority patent/CN110709859A/zh
Publication of WO2021042248A1 publication Critical patent/WO2021042248A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1347—Preprocessing; Feature extraction
    • G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]

Definitions

  • the embodiments of the present application relate to the field of fingerprint identification, and more specifically, to a method, device, and electronic device for fingerprint detection.
  • the fingerprint detection technology under the optical screen is to collect the light signal formed by the reflection or transmission of light on the finger through the optical fingerprint module.
  • the optical signal carries the fingerprint information of the finger, so as to realize the fingerprint detection under the screen.
  • HBM High Brightness Mode
  • HBM High Brightness Mode
  • the embodiments of the present application provide a fingerprint detection method, device, and electronic equipment, which can increase the service life of the display screen.
  • a fingerprint detection method which is applied to optical fingerprint detection under a display screen, the method includes: collecting fingerprint data of the finger when the light source is in the first mode; and after completing the fingerprint data collection After that, the light source is switched from the first mode to the second mode, and the fingerprint data is processed to obtain a fingerprint detection result, wherein the color components in the light source in the second mode are the same as the color components in the light source. In the first mode, the color components in the light source are different.
  • the color component in the light source in the second mode does not include blue light.
  • the color components in the light source in the first mode include red light, green light, and blue light.
  • the method further includes: if the fingerprint detection result is a failure, switching the light source from the second mode to the first mode; in the first mode To re-collect the fingerprint data of the finger.
  • the display screen is an OLED or an LED, wherein the light-emitting layer of the display screen includes a plurality of diode light sources, and the light source includes at least part of the plurality of diode light sources.
  • a fingerprint detection device which is arranged under the display screen to realize under-screen optical fingerprint detection.
  • the device includes: an optical fingerprint sensor for collecting fingerprints of a finger when the light source is in the first mode Data; a processor, configured to switch the light source from the first mode to the second mode after completing the fingerprint data collection, and process the fingerprint data to obtain a fingerprint detection result, wherein the The color composition of the light source in the second mode is different from the color composition of the light source in the first mode.
  • the color component in the light source in the second mode does not include blue light.
  • the color components in the light source in the first mode include red light, green light, and blue light.
  • the processor is further configured to switch the light source from the second mode to the first mode when the fingerprint detection result is a failure; the optical fingerprint sensor It is also used to re-acquire fingerprint data of the finger in the first mode.
  • the display screen is an OLED or an LED, wherein the light-emitting layer of the display screen includes a plurality of diode light sources, and the light source includes at least part of the plurality of diode light sources.
  • an electronic device including:
  • the fingerprint detection device in the second aspect or any possible implementation of the second aspect.
  • the light source when fingerprint data is collected, the light source is placed in the first mode, and after the fingerprint data collection is completed, the light source is switched from the first mode to the second mode and the fingerprint data is processed to obtain Fingerprint test results.
  • the light sources are in different modes during fingerprint data collection and fingerprint data processing.
  • FIGS 1A and 2A are schematic diagrams of electronic devices to which the present application can be applied.
  • Figures 1B and 2B are schematic cross-sectional views of the electronic device shown in Figures 1A and 2A along the A-A' direction, respectively.
  • FIG. 3 is a schematic flowchart of a fingerprint detection method according to an embodiment of the present application.
  • Fig. 4 is a possible implementation of the method shown in Fig. 3.
  • Fig. 5 is a schematic block diagram of a fingerprint detection device according to an embodiment of the present application.
  • the embodiments of this application can be applied to fingerprint systems, including but not limited to optical, ultrasonic or other fingerprint identification systems and medical diagnostic products based on optical, ultrasonic or other fingerprint imaging.
  • the embodiments of this application only take optical fingerprint systems as an example
  • the embodiments of the present application should not constitute any limitation, and the embodiments of the present application are also applicable to other systems that use optical, ultrasonic, or other imaging technologies.
  • the optical fingerprint system provided in the embodiments of the present 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, the optical fingerprint The module can be set in a partial area or the entire area under the display screen to form an under-display or under-screen optical fingerprint system.
  • the optical fingerprint module may also be partially or fully integrated into the display screen of the electronic device, thereby forming an in-display or in-screen optical fingerprint system.
  • the fingerprint recognition technology under the optical screen uses the light returned from the top surface of the device display component to perform fingerprint sensing and other sensing operations.
  • the returned light carries information about objects that are in contact with the top surface, such as a finger.
  • the optical fingerprint detection of the specific optical sensor module located under the display screen is realized.
  • the design of the optical sensor module can be to achieve desired optical imaging by appropriately configuring optical elements for collecting and detecting the returned light.
  • Figures 1A and 2A show schematic diagrams of electronic devices to which the embodiments of the present application can be applied.
  • 1A and 2A are schematic diagrams of the orientation of the electronic device 10
  • Figs. 1B and 2B are schematic partial cross-sectional diagrams of the electronic device 10 shown in Figs. 1A and 2A along the direction A-A', respectively.
  • the electronic device 10 includes a display screen 120 and an optical fingerprint module 130.
  • the optical fingerprint module 130 is arranged in a partial area below the display screen 120.
  • 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 pixels, photosensitive pixels, pixel units, etc.).
  • the area where the sensing array 133 is located or its sensing area is the fingerprint detection area 103 of the optical fingerprint module 130. As shown in FIG. 1A, the fingerprint detection area 103 is located in the display area of the display screen 120.
  • the optical fingerprint module 130 can also be arranged in other positions, such as the side of the display screen 120 or the non-transparent area of the edge of the electronic device 10, and the optical fingerprint module 130 The optical signal of 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 area of the fingerprint detection area 103 may be different from the area of the sensing array 133 of the optical fingerprint module 130, for example, through an optical path design such as lens imaging, a reflective folding optical path design, or other optical paths such as light convergence or reflection.
  • the design can make the area of the fingerprint detection area 103 of the optical fingerprint module 130 larger than the area of the sensing array 133 of the optical fingerprint module 130.
  • the fingerprint detection area 103 of the optical fingerprint module 130 may also be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130.
  • the electronic device 10 adopting the above structure does not need to reserve space on the front side to set a 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 It can be basically extended to the front of the entire electronic device 10.
  • a fingerprint button such as the Home button
  • the optical fingerprint module 130 includes a light detecting part 134 and an optical component 132.
  • the light detection part 134 includes the sensing array 133, a reading circuit electrically connected to the sensing array 133, and 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 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 above-mentioned optical sensing unit.
  • 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. It can be used to filter out the ambient light penetrating the finger, and the light guide layer is mainly used to guide the reflected light reflected from the surface of the finger to the sensing array 133 for optical detection.
  • a filter layer Finter
  • a light guide layer or a light path guiding structure and other optical elements. It can be used to filter out the ambient light penetrating the finger, and the light guide layer 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 is attached above the chip, or some components of the optical assembly 132 are integrated into the chip.
  • the light guide layer of the optical component 132 has a variety of implementation schemes.
  • the light guide layer may be specifically a collimator layer made on a semiconductor silicon wafer, which has a plurality of collimator units.
  • 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 sensing unit below it, and then enter The light with an excessively large angle is attenuated by multiple reflections inside the collimating unit. Therefore, each optical sensing unit can basically only receive the reflected light reflected by the fingerprint pattern directly above it, so the sensing array 133 is convenient.
  • the fingerprint image of the finger can be detected.
  • the light guide layer 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 to The reflected light reflected by the finger is condensed 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.
  • 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 module 130 to improve The fingerprint imaging effect of the optical fingerprint module 130 is described.
  • the light guide layer 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-lens, which may be obtained through a semiconductor growth process or other processes. It is formed above the sensing array 133 of the light detecting part 134, and 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 micro lens 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 may also be included between the micro-lens layer and the sensing unit, wherein the micro-holes are formed in their corresponding micro-holes.
  • the light blocking layer can block the optical interference between the adjacent microlens and the sensing unit, and make the light corresponding to the sensing unit converge into the inside of the microhole through the microlens. It is transmitted to the sensing unit via the micro-hole for optical fingerprint imaging.
  • a micro lens layer may be further provided above or below the collimator layer or the optical lens layer.
  • the collimator layer or the optical lens layer is used in combination with the microlens layer, its 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 (Organic Light-Emitting Diode, OLED) display or a micro-LED (Micro-LED) display.
  • a self-luminous display unit such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display or a micro-LED (Micro-LED) display.
  • OLED Organic Light-Emitting Diode
  • Micro-LED Micro-LED
  • the optical fingerprint module 130 can use the display unit (ie, an OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection.
  • the display screen 120 emits a beam of light 111 to the 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 the The finger 140 scatters inside to form scattered 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.
  • 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 implementing the optical fingerprint recognition function in the electronic device 10.
  • 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.
  • the optical fingerprint module 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 excitation light source may specifically be an infrared light source or a light source of non-visible 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 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 in all areas. Below the backlight module, 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.
  • the optical fingerprint module 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 may also include a transparent protective cover, and the cover may be a glass cover or a sapphire cover, which is located above the display screen 120 and covers the electronic device.
  • the electronic device 10 may further include a circuit board 150, and the circuit board 150 is disposed under the optical fingerprint module 130.
  • the optical fingerprint module 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 module 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 module 130 may receive the control signal of the processing unit of the electronic device 10 through the circuit board 150, and may also output the fingerprint detection signal from the optical fingerprint module 130 to the processing unit of the terminal device 10 through the circuit board 150. Control unit, etc.
  • the optical fingerprint module 130 may include only one optical fingerprint sensor. At this time, the fingerprint detection area 103 of the optical fingerprint module 130 has a small area and a fixed position. Therefore, the user needs to input fingerprints. Press the finger to a 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 a plurality of 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 collectively 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 device 130 in the electronic device 10 includes a plurality of optical fingerprint sensors, and the plurality of optical fingerprint sensors may be arranged side by side in all areas by means such as splicing. Below the display screen 120 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 multiple light guide layers, and each light guide layer corresponds to an optical fingerprint sensor, and is attached to the optical fingerprint sensor. Set above the corresponding optical fingerprint sensor.
  • the plurality of optical fingerprint sensors may also share an integral light guide layer, that is, the light guide layer has an area large enough to cover the sensing array of the plurality of optical fingerprint sensors.
  • the optical component 132 may also include other optical elements, such as a filter or other optical films, which may be arranged between the light guide layer and the optical fingerprint sensor or on the display
  • the screen 120 and the light guide layer are mainly used to isolate the influence of external interference light on the optical fingerprint detection.
  • the filter can be used to filter out the ambient light that penetrates the finger and enters the optical fingerprint sensor through the display screen 120.
  • the optical filter may be separately provided for each optical fingerprint sensor to filter out interference light, or a large-area optical filter may be used to simultaneously cover the multiple optical fingerprint sensors.
  • the light guide layer may also be replaced by an optical lens (Lens), and a small hole formed by a light-shielding material above the optical lens can cooperate with the optical lens to converge fingerprint detection light to an optical fingerprint sensor below to realize fingerprint imaging.
  • each optical fingerprint sensor may be separately configured with an optical lens to perform fingerprint imaging, or the multiple optical fingerprint sensors may also use the same optical lens to achieve light convergence and fingerprint imaging.
  • each optical fingerprint sensor may even have two sensing arrays (Dual Array) or multiple sensing arrays (Multi-Array), and two or more optical lenses are configured to cooperate with the two at the same time. Or multiple sensing arrays perform optical imaging, thereby reducing the imaging distance and enhancing the imaging effect.
  • the number, size, and arrangement of the optical fingerprint sensors shown above are only examples, and can be adjusted according to actual needs.
  • the number of the plurality of optical fingerprint sensors may be 2, 3, 4, or 5, etc., and the plurality of optical fingerprint sensors may be distributed in a matrix or a circle.
  • HBM High Brightness Mode
  • the embodiment of the present application provides a fingerprint detection solution.
  • the components of the light source are dynamically adjusted, thereby reducing the probability of screen burn-in and increasing the service life of the display screen.
  • FIG. 3 is a schematic flowchart of a fingerprint detection method according to an embodiment of the application.
  • the method 300 is applied to under-screen optical fingerprint detection.
  • the method 300 includes some or all of the following steps.
  • the light source is switched from the first mode to the second mode, and the fingerprint data is processed to obtain a fingerprint detection result.
  • the color composition of the light source in the second mode is different from the color composition of the light source in the first mode.
  • the light source When performing fingerprint detection, the light source usually turns on the HBM mode to realize the collection of fingerprint data of the finger. However, it is easy to cause screen burn in HBM mode. Therefore, in this embodiment, when the fingerprint data is collected, the light source is in the first mode, and after the fingerprint data collection is completed, the light source is switched from the first mode to the second mode and the fingerprint data is processed, To get the fingerprint detection result. In this way, the light sources are in different modes during fingerprint data collection and fingerprint data processing. By setting the color components in the light source in the two modes, the effective acquisition of fingerprint data can be achieved during fingerprint data collection, and the color components in the light source can be changed during fingerprint data processing to reduce damage to the display screen.
  • the light source is a light source used for fingerprint detection.
  • the color component in the light source may include at least one of red light (Red, R), green light (Green, G), and blue light (Blue, B), for example.
  • the color components in the light source include red light, green light, and blue light.
  • the ratio of red light, green light and blue light can make the light emitted by the light source white, that is, the light spot displayed in the fingerprint detection area in the display screen is white.
  • this application is not limited to this, and the color of the light emitted by the light source can be any color by adjusting the ratio of red light, green light and blue light.
  • the color component in the light source does not include blue light.
  • the reason why the color component of the light source in the second mode does not include blue light is that the hardware part for emitting blue light in the display screen has a shorter lifespan and higher cost. Therefore, the light source is switched to the second mode. Turn off the hardware part that emits blue light in the mode, shorten the time to keep the blue light component in the HBM mode, thereby reducing the probability of burning the screen and increasing the service life of the display.
  • the light source may not include any color components. That is to say, after the fingerprint data is collected, the hardware part that emits red light, green light and blue light is turned off, that is, the light source is turned off. However, when the light source is turned off, the change in the color of the light spot in the fingerprint detection area will make the user feel very abrupt, thereby affecting the user's visual experience during fingerprint detection and reducing the user experience. If the hardware part that emits blue and green light is turned off after fingerprint data is collected, or the hardware part that emits blue and red light is turned off, the color of the light spot displayed in the fingerprint detection area will also change significantly, which will affect The user’s visual experience.
  • the light source configured in the second mode does not include only blue light, that is, when the light source is switched from the first mode to the second mode, only the light source for emitting blue light is turned off.
  • the hardware part so as to minimize the light color change caused by the color component change in the light source, so that the color of the light spot displayed in the fingerprint detection area does not change much when the light source is switched, and the user's visual experience is guaranteed.
  • the embodiment of this application does not make any limitation on the type of the display screen.
  • the display screen may be a self-luminous display screen, and the light-emitting unit in the light-emitting layer in the display screen is used as the light source for fingerprint detection; the display screen may also be a non-self-luminous display screen, and an external light source is used as the fingerprint detection device.
  • the light source may be a self-luminous display screen, and the light-emitting unit in the light-emitting layer in the display screen is used as the light source for fingerprint detection; the display screen may also be a non-self-luminous display screen, and an external light source is used as the fingerprint detection device.
  • the light source may be a self-luminous display screen, and the light-emitting unit in the light-emitting layer in the display screen is used as the light source for fingerprint detection; the display screen may also be a non-self-luminous display screen, and an external light source is used as the fingerprint detection device. The light source.
  • the display screen may be an organic light-emitting diode display (Organic Light-Emitting Diode, OLED), wherein the light-emitting layer of the display screen includes a plurality of organic light-emitting diode light sources, and the light source includes the plurality of organic light-emitting diodes. At least part of the diode light source.
  • OLED Organic Light-Emitting Diode
  • the display screen may be a light-emitting diode display (Light-Emitting Diode, LED), wherein the light-emitting layer of the display screen includes a plurality of light-emitting diode light sources, and the light source includes the plurality of light-emitting diode light sources. At least part of it.
  • LED Light-Emitting Diode
  • the red LED, green LED and blue LED are composed of one pixel.
  • the light source is in the first mode, and the red LED, green LED, and blue LED in each pixel are all turned on, so that the finger is illuminated and the fingerprint data of the finger is collected by the optical fingerprint sensor.
  • the light source is switched from the first mode to the second mode, and the collected fingerprint data is processed in the second mode to obtain the fingerprint detection result.
  • the red LED and the green LED in each pixel emit light while the blue LED is off. Since the light source is mainly used to collect fingerprint data of the finger, after the fingerprint data collection is completed, the blue light component in the light source is immediately reduced. By turning off the blue LED, the time of maintaining the blue light component in the HBM mode is shortened as much as possible, thereby Avoid burn-in caused by blue LED damage and extend the life of the display.
  • the light source is switched from the second mode to the first mode, and the fingerprint of the finger is collected again in the first mode. Fingerprint data.
  • fingerprint detection fails based on the first frame of fingerprint data, you can re-acquire a frame of fingerprint data and perform fingerprint detection. Since a richer amount of light is needed to illuminate the finger to obtain more effective data when collecting fingerprint data, the light source can be switched from the second mode to the first mode, so that the optical fingerprint sensor reacquires a frame when the light source is in the first mode Fingerprint data.
  • the method includes:
  • the light source turns on the HBM mode.
  • the light source is in the first mode, and fingerprint data of the finger is collected.
  • the color components of the light source in the first mode include red light, green light and blue light.
  • the light source illuminates the finger above the fingerprint detection area, and the optical fingerprint sensor collects the light signal returned by the finger, and the light signal carries the fingerprint data of the finger.
  • the light source is switched from the first mode to the second mode.
  • the color components of the light source include red light and green light but not blue light.
  • the light source is in the second mode, and the fingerprint data collected in 420 is processed to obtain the fingerprint detection result.
  • operations such as preprocessing, image enhancement, feature extraction, and matching of the extracted feature data with the fingerprint template in the database can be performed on the fingerprint data, so as to determine whether the finger is detected successfully.
  • the light source is switched from the second mode to the first mode.
  • step 420 is executed to reacquire fingerprint data of the finger.
  • a threshold N can be set, for example, N is 1, 2 or 3. If after performing the procedures 420 to 450 shown in FIG. 4 for N times, that is, after performing N times on the finger, the detection is still not successful, the process shown in FIG. 4 can be terminated.
  • Fig. 5 is a schematic block diagram of a fingerprint detection device according to an embodiment of the present application.
  • the device 500 is arranged under the display screen to realize the under-screen optical fingerprint recognition. As shown in FIG. 5, the device 500 includes:
  • the optical fingerprint sensor 510 is used to collect fingerprint data of the finger when the light source is in the first mode
  • the processor 520 is configured to switch the light source from the first mode to the second mode after completing the fingerprint data collection, and process the fingerprint data to obtain a fingerprint detection result.
  • the color composition of the light source in the second mode is different from the color composition of the light source in the first mode.
  • the optical fingerprint sensor 510 may be, for example, the optical detection portion 134 shown in FIG. 1B and FIG. 2B.
  • the optical detection portion 134 may be, for example, the optical detection portion 134 shown in FIG. 1B and FIG. 2B.
  • details are not repeated here.
  • the processor 520 may be a processor of an electronic device, such as a central processing unit (Central Processing Unit, CPU), etc., and the processor may also be an independently set processor for fingerprint detection. Not limited.
  • a central processing unit Central Processing Unit, CPU
  • CPU Central Processing Unit
  • the light source is an excitation light source for fingerprint recognition.
  • the processor 520 may control the switching of the light source between the first mode and the second mode.
  • the processor 520 controls the light source to be in the first mode, and after the fingerprint data collection is completed, the processor 520 controls the light source to switch from the first mode to the second mode and process the fingerprint data to Get the fingerprint detection result.
  • the light sources are in different modes during fingerprint data collection and fingerprint data processing. Therefore, by setting the color components in the light source in the two modes, fingerprint data can be effectively acquired during fingerprint data collection, and the color components in the light source can be changed during fingerprint data processing to reduce damage to the display screen.
  • the color component in the light source may include at least one of red light, green light, and blue light, for example.
  • the color components in the light source include red light, green light, and blue light.
  • the ratio of red light, green light and blue light can make the light emitted by the light source white, that is, the light spot displayed in the fingerprint detection area in the display screen is white.
  • this application is not limited to this, and the color of the light emitted by the light source can be any color by adjusting the ratio of red light, green light and blue light.
  • the color component of the light source does not include blue light.
  • the light source Since the hardware part for emitting blue light in the display screen has a short lifespan and high cost, the light source turns off the hardware part for emitting blue light when the light source is switched to the second mode, which can reduce the probability of screen burn-in and improve the display screen’s efficiency. Service life.
  • the display screen may be a self-luminous display screen, and the light-emitting unit in the light-emitting layer in the display screen is used as the light source for fingerprint detection; the display screen may also be a non-self-luminous display screen, and an external light source is used for fingerprint detection.
  • the light source may be a self-luminous display screen, and the light-emitting unit in the light-emitting layer in the display screen is used as the light source for fingerprint detection; the display screen may also be a non-self-luminous display screen, and an external light source is used for fingerprint detection.
  • the light source may be a self-luminous display screen, and the light-emitting unit in the light-emitting layer in the display screen is used as the light source for fingerprint detection; the display screen may also be a non-self-luminous display screen, and an external light source is used for fingerprint detection. The light source.
  • the display screen may be OLED or LED.
  • the light-emitting layer of the display screen includes a plurality of diode light sources, and the light source includes at least part of the plurality of diode light sources.
  • the processor 520 is further configured to switch the light source from the second mode to the first mode when the fingerprint detection result is a failure; the optical fingerprint sensor 510 is also configured to , In the first mode, reacquire fingerprint data of the finger.
  • fingerprint detection fails based on the first frame of fingerprint data, you can re-acquire a frame of fingerprint data and perform fingerprint detection.
  • the light source can be switched from the second mode back to the first mode, so that the optical fingerprint sensor can collect a frame again when the light source is in the first mode Fingerprint data.
  • the device 500 may be used to execute the aforementioned method 300 of fingerprint detection, and the features of the aforementioned method are also applicable to the device side.
  • An embodiment of the present application also provides an electronic device, which includes:
  • the fingerprint detection device 500 in the various embodiments of the present application described above.
  • the electronic device further includes a display screen, and the display screen may be a non-folding display screen or a foldable display screen, that is, a flexible display screen.
  • the electronic devices in the embodiments of the present application may be portable or mobile computing devices such as terminal devices, mobile phones, tablet computers, notebook computers, desktop computers, game devices, in-vehicle electronic devices, or wearable smart devices, and Electronic databases, automobiles, bank automated teller machines (Automated Teller Machine, ATM) and other electronic equipment.
  • the wearable smart device includes full-featured, large-sized, complete or partial functions that can be realized without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on certain types of application functions, and need to cooperate with other devices such as smart phones Use, such as various types of smart bracelets, smart jewelry and other equipment for physical sign monitoring.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un procédé et un appareil de détection d'empreintes digitales, capables d'améliorer la durée de vie en service d'un écran d'affichage. Le procédé est appliqué à la détection optique sous écran d'empreintes digitales. Le procédé comporte les étapes consistant à: collecter des données d'empreinte digitale d'un doigt lorsqu'une source lumineuse est dans un premier mode; après l'achèvement de la collecte des données d'empreinte digitale, faire passer la source lumineuse du premier mode à un second mode, et effectuer un traitement sur les données d'empreinte digitale pour obtenir un résultat de détection d'empreintes digitales, une composante de couleur de la source lumineuse dans le second mode étant différente de celle de la source lumineuse dans le premier mode.
PCT/CN2019/104069 2019-09-02 2019-09-02 Procédé et appareil de détection d'empreintes digitales, et dispositif électronique WO2021042248A1 (fr)

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CN201980001860.8A CN110709859A (zh) 2019-09-02 2019-09-02 指纹检测的方法、装置和电子设备

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