WO2021056392A1 - Appareil d'empreintes digitales optique, dispositif électronique et procédé de mesure de distance - Google Patents

Appareil d'empreintes digitales optique, dispositif électronique et procédé de mesure de distance Download PDF

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Publication number
WO2021056392A1
WO2021056392A1 PCT/CN2019/108449 CN2019108449W WO2021056392A1 WO 2021056392 A1 WO2021056392 A1 WO 2021056392A1 CN 2019108449 W CN2019108449 W CN 2019108449W WO 2021056392 A1 WO2021056392 A1 WO 2021056392A1
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WO
WIPO (PCT)
Prior art keywords
pattern
display screen
optical
distance
light
Prior art date
Application number
PCT/CN2019/108449
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English (en)
Chinese (zh)
Inventor
何嘉明
丘芳芳
陈伟文
Original Assignee
深圳市汇顶科技股份有限公司
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Publication date
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 PCT/CN2019/108449 priority Critical patent/WO2021056392A1/fr
Priority to CN201980002077.3A priority patent/CN110832503B/zh
Publication of WO2021056392A1 publication Critical patent/WO2021056392A1/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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors

Definitions

  • the embodiments of the present application relate to the field of optical fingerprint technology, and more specifically, to optical fingerprint devices, electronic devices, and methods for measuring distances.
  • the under-screen optical fingerprint recognition technology is to set the optical fingerprint device under the display screen, and use the fingerprint sensor in the optical fingerprint device to receive the light reflected from the finger to perform fingerprint imaging to realize fingerprint recognition.
  • the distance between the finger and the fingerprint sensor may be different, and the intensity of the light signal received by the corresponding fingerprint sensor is different, resulting in different fingerprint recognition performance. Therefore, how to determine the distance between the finger and the fingerprint sensor to adjust the fingerprint recognition algorithm or determine whether the optical fingerprint device is qualified or not is a problem that needs to be solved urgently.
  • the embodiments of the present application provide an optical fingerprint device, an electronic device, and a method for measuring distance, which can determine the distance between a finger and an optical sensor.
  • an optical fingerprint device which is used to be arranged under the display screen of an electronic device, and includes: an optical component for a first optical signal returned from the first pattern on the display screen along the first One direction is guided to the optical sensor, and the second light signal returned from the second pattern on the display screen is guided to the optical sensor along a second direction, wherein the first direction and the second direction are different
  • An optical sensor for receiving the optical signal returned from the first pattern and the second pattern on the display screen and transmitted through the optical component to obtain the first pattern and the second pattern The image formed on the imaging surface of the optical sensor;
  • the distance between the first pattern and the second pattern on the display screen is used to determine the distance between the display screen and the imaging surface of the optical sensor.
  • the first direction and the second direction are both at a first angle with the normal direction of the display screen, and the first direction and the second direction are along the display
  • the normal direction of the screen is symmetrical.
  • the distance P between the display screen and the imaging surface of the optical sensor is determined according to the following formula:
  • the D1 represents the distance between the first pattern and the second pattern on the display screen
  • the D2 represents the distance between the image of the first pattern and the image of the second pattern
  • the ⁇ represents the first angle.
  • the optical assembly includes an oblique hole collimator
  • the oblique hole collimator includes at least one first collimating hole and at least one second collimating hole, wherein the first collimator
  • the straight hole is used to guide the first light signal returned from the first pattern to the optical sensor along the first direction
  • the second collimating hole is used to guide the return signal from the second pattern to the optical sensor.
  • the second optical signal is guided to the optical sensor along the second direction.
  • each of the at least one first collimating hole forms the first angle with the normal direction of the display screen
  • the at least one second collimating hole Each second collimating hole in the holes forms the first angle with the normal direction of the display screen.
  • the optical component includes a lens for transmitting the first optical signal returned from the first pattern to the optical sensor along the first direction, and The second optical signal returned from the second pattern is transmitted to the optical sensor along the second direction.
  • the optical component includes at least one light-blocking layer and a microlens array, the at least one light-blocking layer is disposed under the microlens array, and each of the at least one light-blocking layer A plurality of light-passing holes are provided in the light blocking layer, and the plurality of light-passing holes correspond to the plurality of microlenses in the microlens array;
  • the microlens array is used to transmit the first optical signal returned from the first pattern to the optical sensor along the first direction, and the first optical signal returned from the second pattern Two optical signals are transmitted to the optical sensor along the second direction.
  • the plurality of microlenses include at least one first microlens and at least one second microlens
  • the plurality of light-passing holes includes at least one first light-passing hole and at least one second light-passing hole.
  • the at least one first light hole corresponds to the at least one first microlens one to one
  • the at least one second light hole corresponds to the at least one second microlens one to one
  • the line connecting the center of the first microlens and the center of the corresponding first light-passing hole forms a first angle with the normal direction of the display screen
  • the center of the second micro-lens and the corresponding second light-passing hole The connection line between the center of and the normal direction of the display screen is at the first angle.
  • the display screen is an organic light emitting diode OLED display screen, and the display screen includes a plurality of OLED light sources, and the optical fingerprint device uses at least part of the OLED light sources as excitation light sources for optical fingerprint detection.
  • an electronic device including: a display screen;
  • the first aspect or the optical fingerprint device in any possible implementation of the first aspect, wherein the optical fingerprint device is arranged below 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, and the optical fingerprint device uses at least part of the OLED light sources as excitation light sources for optical fingerprint detection.
  • a method for measuring distance is provided, which is applied to an optical fingerprint device, wherein the optical fingerprint device is configured to be installed under the display screen of an electronic device, and the method includes:
  • the distance between the first pattern and the second pattern on the display screen is used to determine the distance between the display screen and the imaging surface of the optical sensor.
  • the method further includes:
  • the distance between the first pattern and the second pattern on the display screen determines the distance between the image of the first pattern and the image of the second pattern, and the first direction and the The angle between the second direction and the normal direction of the display screen determines the distance between the display screen and the imaging surface of the optical sensor.
  • the first direction and the second direction are at a first angle to the normal direction of the display screen, and the first direction and the second direction are along the display screen.
  • the normal direction is symmetrical, wherein, according to the distance between the first pattern and the second pattern on the display screen, the distance between the image of the first pattern and the image of the second pattern is The distance and the angle between the first direction and the second direction and the normal direction of the display screen to determine the distance between the display screen and the imaging surface of the optical sensor includes: The following formula is used to determine the distance P between the display screen and the imaging surface of the optical sensor:
  • the D1 represents the distance between the first pattern and the second pattern on the display screen
  • the D2 represents the distance between the image of the first pattern and the image of the second pattern
  • the ⁇ represents the first angle.
  • the light signals returned from the at least two patterns on the display screen can be guided to the optical sensor in different directions through the optical component, and the optical sensor can perform the detection of the at least two patterns on the at least two patterns according to the received light signals.
  • the patterns are imaged, so that the distance between the images of the at least two patterns and the distance between the at least two patterns on the display screen can be combined with the angles corresponding to the transmission directions of the at least two patterns to determine the The distance between the display screen and the imaging surface of the optical sensor.
  • Fig. 1 is a schematic plan view of an electronic device to which the present application can be applied.
  • Fig. 2 is a schematic partial cross-sectional view of the electronic device shown in Fig. 1 along A'-A'.
  • FIG. 3 is a schematic diagram of an application of the optical fingerprint device according to an embodiment of the present application.
  • Figures 4 to 6 are schematic diagrams of implementations of the optical components of the embodiments of the present application.
  • Fig. 7 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • FIG. 8 is a schematic block diagram of a method for measuring a distance according to an embodiment of the present application.
  • the fingerprint identification device provided in the embodiments of this application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other terminal devices; more specifically, in the above-mentioned terminal 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.
  • Figures 1 and 2 show schematic diagrams of electronic devices to which the embodiments of the present application can be applied, wherein Figure 1 is a schematic diagram of the orientation of the electronic device 10, and Figure 2 is a diagram of the electronic device 10 shown in Figure 1 along A'-A' Schematic diagram of partial cross-sectional structure.
  • 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 below the display screen 120, for example, the middle area of the display screen.
  • the optical fingerprint device 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array with a plurality of optical sensing units, and the area where the sensing array is located or the sensing area thereof 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 area of the fingerprint detection area 103 may be different from the area of the sensing array of the optical fingerprint device 130, for example, through optical path design such as lens imaging, reflective folding optical path design, or other optical path design such as light convergence or reflection, etc.
  • the area of the fingerprint detection area 103 of the optical fingerprint device 130 can be made 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 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 device 130 includes a light detection part 134 and an optical component 132.
  • the light detection part 134 includes the sensor array and is electrically connected to the sensor array.
  • the connected reading circuit and other auxiliary circuits 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 (Photodetector) array, which includes A plurality of photodetectors distributed in an array, the photodetector can be used as the optical sensing unit as described above; the optical component 132 can be arranged above the sensing array of the photodetecting part 134, which can specifically include A filter, a light guide layer or a light path guide structure, and other optical elements.
  • the filter layer can be used to filter ambient light penetrating the finger, for example, infrared light that interferes with imaging, and the light guide layer Or the light path guiding structure is mainly used to guide the reflected light reflected from the finger surface 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 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 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 solutions.
  • a collimating unit or a micro-hole array, the collimating unit may 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 passed by the optical sensing unit below it.
  • the light with an excessively large incident angle is attenuated by multiple reflections inside the collimating unit. Therefore, each optical sensor unit can basically only receive the reflected light reflected by the fingerprint pattern directly above it.
  • the sensor array can detect the fingerprint image of the finger.
  • 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 The sensing array used to condense the reflected light reflected from the finger to 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 to improve the optical The fingerprint imaging effect of the 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, which can be grown by semiconductors.
  • a process or other processes are 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.
  • 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.
  • the micro lens layer and the sensing unit may also include The light-blocking layer of the micro-hole, wherein 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 sensing
  • the light corresponding to the unit is condensed into the micro hole through the micro lens and is transmitted to the sensing unit through the micro hole to perform 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 microlens layer, its specific laminated structure or optical path may need to be adjusted according to actual needs.
  • the display screen 120 may be 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 Screen.
  • OLED Organic Light-Emitting Diode
  • the optical fingerprint device 130 may 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 to the target finger above the fingerprint detection area 103. The light is reflected on the surface of the finger to form reflected light or is scattered inside the finger.
  • the scattered light is formed.
  • the above-mentioned reflected light and scattered light are collectively referred to as reflected light.
  • the ridge and valley of the fingerprint have different light reflection capabilities, the reflected light from the fingerprint ridge and the emitted light from the fingerprint ridge have different light intensities.
  • the sensing array in the device 130 receives and converts it into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby implementing the electronic device 10 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 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 terminal 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 screen or arranged in the edge area under the protective cover of the terminal device 10, and the The optical fingerprint device 130 can be arranged under the edge area of the liquid crystal panel or the protective cover and guided through 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 in the backlight module. Under the group, 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 device 130 through openings or other optical designs on the film layers such as diffuser, brightness enhancement film, and reflective film. .
  • the display screen 120 may also be a non-self-luminous display screen, such as a backlit liquid crystal display screen; in this case, the optical detection device 130 cannot use the display screen 120.
  • the display unit is used as an excitation light source, so it is necessary to integrate an excitation light source inside the optical detection device 130 or set an excitation light source outside it to achieve optical fingerprint detection.
  • a built-in light source or an external light source is used to provide when the optical signal is used for fingerprint detection, the detection principle is consistent with the content described above.
  • the electronic device 10 further includes a transparent protective cover, which is located above the display screen 120 and covers the front surface of the electronic device 10. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.
  • 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, so the user is performing fingerprint input At this time, it is necessary to 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 multiple optical fingerprint sensors; the multiple optical fingerprint sensors may be arranged side by side in the middle area of the display screen 120 in a splicing manner, and the multiple The sensing area of the optical fingerprint sensor collectively constitutes the fingerprint detection area 103 of the optical fingerprint device 130.
  • 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 It extends to the main area of the middle part of the display screen, that is, extends to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation.
  • the fingerprint detection area 130 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 may further include a circuit board for transmitting signals (such as the fingerprint detection signal).
  • the circuit board may be a flexible printed circuit board (Flexible Printed Circuit Board). Circuit, FPC).
  • the optical fingerprint sensor can be connected to the FPC, and through the FPC, electrical interconnection and signal transmission with other peripheral circuits or other elements in the electronic device can be realized.
  • the optical fingerprint sensor may receive the control signal of the processing unit of the electronic device through the FPC, and may also output a fingerprint detection signal (for example, a fingerprint image) to the processing unit of the electronic device through the FPC or Control unit, etc.
  • FIG. 3 is a schematic diagram of a cross-sectional structure of an electronic device applied to an optical fingerprint device according to an embodiment of the present application.
  • the optical fingerprint device 40 may be disposed under the display screen 200 of the electronic device. As shown in FIG. 3, the optical fingerprint device 40 can include:
  • the optical assembly 400 is used to guide the first optical signal 241 returned from the first pattern 211 on the display screen 200 to the optical sensor 300 in the first direction, and to transfer the second pattern 212 on the display screen 200 to the optical sensor 300.
  • the returned second optical signal 242 is guided to the optical sensor 300 along a second direction, wherein the first direction and the second direction are different;
  • the optical sensor 300 is configured to receive the optical signals returned from the first pattern 211 and the second pattern 212 on the display screen 200 and transmitted through the optical component 400 to obtain the first pattern 211 and
  • the distance between the first pattern 211 and the second pattern 212 on the display screen 200, the distance between the image 311 of the first pattern and the image 312 of the second pattern, and the distance The angles between the first direction and the second direction and the normal direction 201 of the display screen are used to determine the distance P between the display screen 200 and the imaging surface of the optical sensor 300.
  • the display screen 200 here may correspond to the display screen 120 in FIG. 1 and FIG. 2
  • the optical sensor 300 may correspond to the light detection part 134 in FIG. 2
  • the optical sensor 300 may include a plurality of pixel units.
  • the pixel array formed reference may be made to the related description of the embodiment shown in FIG. 2 for specific implementation. For brevity, details are not repeated here.
  • the pixel unit may be referred to as a sensing unit, or an optical sensing unit, or a photoelectric sensing unit, etc., for receiving light signals returned from an object above the display screen to form the optical sensor.
  • the pixel array can be called a sensor array, an optical sensor array, or a photoelectric sensor array.
  • the optical signal collected by the pixel array can be used to form an image.
  • the imaging surface of the optical sensor It may be the surface where the pixel array of the optical sensor is located.
  • the embodiments of the present application do not particularly limit the specific directions of the first direction and the second direction.
  • the first direction and the normal direction 201 of the display screen are in the first direction.
  • Angle, the second direction and the normal direction 201 of the display screen form a second angle, and the first direction and the second direction are located on both sides of the normal direction 201 of the display screen.
  • the first angle and the second angle are equal, that is, the first direction and the second direction are symmetrical with respect to the normal direction 201 of the display screen; or, the first angle and the second angle
  • the angles are not equal, that is, the first direction and the second direction are asymmetric with respect to the normal direction 201 of the display screen.
  • the first direction forms a first angle with the normal direction 201 of the display screen
  • the second direction forms a second angle with the normal direction 201 of the display screen
  • the The first direction and the second direction are located on one side of the normal direction 201 of the display screen. In this case, the first angle and the second angle are not equal.
  • the embodiment of the present application does not specifically limit the shape and size of the first pattern and the second pattern.
  • the first pattern may be a dot, a straight line, or a specific mark, or may be a fingerprint pattern, similar to
  • the second pattern may be a dot, a straight line, or a specific mark, or may also be a fingerprint pattern.
  • the distance between the first pattern and the second pattern on the display screen may be the distance between a specific point on the first pattern and the second pattern, or a specific edge
  • the distance between the two points, or the horizontal distance or the linear distance between the two closest points on the first pattern and the second pattern, etc., is not limited in the embodiment of the present application.
  • the distance between the first pattern and the second pattern may be the same position of the first pattern and the second pattern The distance between the points (such as the center, the vertex, etc.), or the horizontal offset distance between the first pattern relative to the second pattern; for another example, if the first pattern and the second pattern
  • the patterns are different patterns, and the distance between the first pattern and the second pattern may be a horizontal distance or a linear distance between the two closest points on the first pattern and the second pattern.
  • the distance between the image of the first pattern and the image of the second pattern may be the distance between the corresponding position on the image of the first pattern and the corresponding position on the image of the second pattern.
  • the corresponding position on the image of the first pattern is the position on the first pattern used when determining the distance between the first pattern and the second pattern on the display screen.
  • the second pattern The corresponding position on the image of the pattern is the position on the second pattern used when determining the distance between the first pattern and the second pattern on the display screen.
  • the distance between the first pattern and the second pattern on the display screen is the center of the first pattern and the center of the second pattern
  • the distance between the image of the first pattern and the image of the second pattern may be the distance between the center of the image of the first pattern and the center of the image of the second pattern
  • the distance between the first pattern and the second pattern on the display screen is the distance between the two sides close to the first pattern and the second pattern
  • the first pattern The distance between the image of the image and the image of the second pattern may be the distance between the two sides close to the image of the first pattern and the image of the second pattern, etc.
  • the embodiment of the present application is not limited to this .
  • the way to determine the distance P is described. If the first pattern and the second pattern are both dots, the image of the first pattern The image with the second pattern is also a dot, and the distance between the image of the first pattern and the image of the second pattern is the distance between two dots.
  • the distance between the two points can be determined according to the distance between the pixel units where the two points are located. Specifically, the area of the imaging surface of the optical sensor is known, and the size and arrangement of the pixel array If the method is known, the area of each pixel unit is known.
  • the distance P for example, if there are K pixel units between these two points and the size of a single pixel unit is L*L, the distance between the two points can be K*L.
  • the electronic device may further include a cover plate, which is arranged above the display screen 200.
  • the distance between the display screen and the imaging surface of the optical sensor The distance P may be the distance from the cover plate to the imaging surface of the optical sensor.
  • a film may be attached to the upper part of the display screen 200.
  • the distance between the display screen and the optical sensor The distance P between the imaging surface of the sensor may be the distance from the film to the imaging surface of the optical sensor.
  • the distance between the display screen and the imaging surface of the optical fingerprint sensor may be The distance P between the pressing surface of the finger and the imaging surface of the optical sensor.
  • the distance P can also be used to determine the thickness of the display screen, or if the electronic device is filmed, it can also be used to determine the display screen and the film.
  • the difference between the determined distance P and the fixed installation distance can be determined as the thickness of the display screen, or the thickness of the display screen and the film.
  • the excitation light source for fingerprint detection can emit light signals to illuminate the first pattern 211 and the second pattern 212 on the display screen 200, and the optical assembly 400 is specially designed, It can realize that the light signals returned by reflection or scattering from the first pattern 211 and the second pattern 212 are transmitted to the optical sensor 300 in different directions, and the image is further imaged on the imaging surface of the optical sensor 300 , The image 311 and the image 312 are obtained. Since the first pattern and the second pattern 212 are transmitted in different directions, the image of the first pattern and the image of the second pattern are different from each other. The distance between the two patterns is different from the distance between the first pattern and the second pattern on the display screen.
  • the excitation light source for fingerprint detection can adopt various implementation modes of the excitation light source in the embodiment shown in Figs. 1 and 2, for example, the OLED light source in the display screen, or other built-in or external excitation light source.
  • the first optical signal 241 returned from the first pattern 211 may be transmitted to the optical sensor 300 along the first direction
  • the second optical signal 242 returned from the second pattern 212 may be transmitted along the second direction.
  • the direction is transmitted to the optical sensor 300, and the first direction and the second direction are symmetrical along the normal direction of the display screen, and the first direction and the second direction are the same as those of the display screen.
  • the normal directions are all at the first angle ⁇ , as shown in FIG. 3.
  • the distance P between the display screen 200 and the imaging surface of the optical sensor 300 can be determined according to the following formula:
  • the D1 represents the distance between the first pattern 211 and the second pattern 212 on the display screen
  • the D2 represents the distance between the image of the first pattern and the image of the second pattern. the distance.
  • optical assembly 400 does not limit the specific implementation of the optical assembly 400, as long as it can guide different patterns to the optical sensor in different directions.
  • optical assembly will be described with reference to FIGS. 4 to 6 Several optional implementations of 400.
  • FIG. 4 is a schematic diagram of an implementation manner of the optical assembly 400 according to an embodiment of the present application.
  • the optical assembly 400 may include an oblique hole collimator 410, and the oblique hole collimator includes at least One first collimating hole 411 and at least one second collimating hole 412, wherein the first collimating hole 411 is used for the first optical signal 241 returned from the first pattern 211 along the first One direction is guided to the optical sensor 300, and the second collimating hole 412 is used to guide the second optical signal 242 returned from the second pattern 212 to the optical sensor 300 along the second direction Further, the optical sensor 300 can image the first light signal and the second light signal to obtain the image 311 and the image 312.
  • each first collimating hole 411 in the at least one first collimating hole is set to form the first angle with the normal direction 201 of the display screen
  • Each of the second collimating holes 412 in is arranged to form a second angle with the normal direction 201 of the display screen.
  • the first angle and the second angle are equal, and the first direction and the second direction are symmetrical with respect to the normal direction 201 of the display screen.
  • the aforementioned formula ( 1) Determine the distance P.
  • the first angle and the second angle are not equal, and the first direction and the second direction are located on both sides of the normal direction 201 of the display screen. In this case, it can be based on the following The formula determines the distance P:
  • the D1 represents the distance between the first pattern 211 and the second pattern 212 on the display screen
  • the D2 represents the distance between the image of the first pattern and the image of the second pattern.
  • ⁇ 1 represents the first angle
  • ⁇ 2 represents the second angle.
  • the first angle and the second angle are not equal, and the first direction and the second direction are located on the side of the normal direction 201 of the display screen.
  • the following can be used The formula determines the distance P:
  • the D1 represents the distance between the first pattern 211 and the second pattern 212 on the display screen
  • the D2 represents the distance between the image of the first pattern and the image of the second pattern.
  • ⁇ 1 represents the first angle
  • ⁇ 2 represents the second angle.
  • FIG. 5 is a schematic diagram of another implementation manner of the optical assembly 400 according to an embodiment of the present application.
  • the optical assembly 400 may include a lens 460, and the lens may include at least one lens.
  • 460 is used to transmit the first light signal 241 returned from the first pattern 211 to the optical sensor 300 along the first direction, and the second light signal 241 returned from the second pattern 212
  • the signal 242 is transmitted to the optical sensor 300 along the second direction.
  • the optical sensor 300 can image the first optical signal and the second optical signal to obtain the image 311 and the Like 312.
  • the lens 460 can transmit the light signals returned from multiple patterns to the optical sensor 300 in different directions to obtain images corresponding to the multiple patterns.
  • the distance between the images, the distance between the multiple patterns on the display screen, and the optical parameters such as the focal length and numerical aperture of the lens determine the distance P between the display screen and the imaging surface of the optical sensor 300.
  • FIG. 6 is a schematic diagram of still another implementation manner of the optical assembly 400 according to an embodiment of the present application.
  • the optical assembly 400 may include at least one light blocking layer 420 and a microlens array 450.
  • a light-blocking layer 420 is provided under the microlens array 450, and each light-blocking layer of the at least one light-blocking layer 420 is provided with a plurality of light-passing holes, and the plurality of light-shielding holes correspond to the A plurality of microlenses in the microlens array 450, wherein the microlens array 450 is used to transmit the first optical signal 241 returned from the first pattern 211 to the optical sensor along the first direction 300, and the second optical signal 242 returned from the second pattern 212 is transmitted to the optical sensor 300 along the second direction.
  • the optical sensor 300 can respond to the first optical signal Perform imaging with the second optical signal to obtain the image 311 and the image 312.
  • the microlens array 450 includes at least one first microlens 451 and at least one second microlens 452, and at least one first light-passing hole 421 and at least one second light-passing hole 421 are provided in the light blocking layer 420.
  • the at least one first light-passing hole 421 corresponds to the at least one first microlens 451 one-to-one
  • the at least one second light-passing hole 422 corresponds to the at least one second microlens 452 one-to-one
  • the first microlens 451 is used to guide the first light signal 241 returned from the first pattern 211 to the first through hole 421 corresponding to the first microlens 451 along the first direction, and pass through all
  • the first light through hole 421 is transmitted to the optical sensor 300
  • the second microlens 452 is used to guide the second optical signal 242 returned from the first pattern 212 to the second microlens in the second direction.
  • the lens 452 corresponds to the second light-passing hole 422 and is transmitted to the optical sensor 300 through the second light-passing hole 422.
  • the direction of the line connecting the center of the first microlens 451 and the center of the first light-passing hole 421 corresponding to the first microlens 451 is the first direction
  • the second microlens 452 The direction of the connecting line between the center of and the center of the second light-passing hole 422 corresponding to the second microlens 452 is the second direction.
  • connection line between the center F 0 of the first microlens 451 and the center F 1 of the first light-passing hole 421 corresponding to the first microlens 451 is connected to the normal direction of the display screen.
  • 201 forms a first angle ⁇
  • connection line between the center F 0 of the second microlens 452 and the center F 1 of the second light through hole 422 corresponding to the second microlens 452 is in the normal direction of the display screen 201 is the first angle ⁇ .
  • the above description only takes the determination of the distance between the display screen and the imaging surface of the optical sensor based on two patterns as an example for description.
  • the imaging from the display screen to the optical sensor may also be determined based on more patterns.
  • the distance between the surfaces is not limited to this in the embodiment of the present application.
  • the optical signal returned from the at least two patterns on the display screen can be guided to the optical sensor in different directions through the optical component, and the optical sensor can perform the detection of the at least two patterns according to the received optical signal.
  • Imaging of the at least two patterns, so that the display screen can be determined according to the imaging distance of the at least two patterns and the distance between the at least two patterns on the display screen, and combined with the angles corresponding to the transmission directions of the at least two patterns The distance P to the imaging surface of the optical sensor.
  • the distance P can be used to determine whether the optical fingerprint device 40 is qualified. For example, if the P is within a preset range, it can be determined that the optical fingerprint device is qualified, and the preset range can be used to correspond to Fingerprint recognition algorithm for fingerprint recognition can ensure good fingerprint recognition performance; or, if the P is not within the preset range, it can be determined that the optical fingerprint device is unqualified, or the fingerprint recognition algorithm can also be adjusted to determine The fingerprint recognition algorithm suitable for the P value can further use the adjusted fingerprint recognition algorithm for fingerprint recognition to improve fingerprint recognition performance.
  • the corresponding fingerprint recognition algorithm can be determined according to the distance P.
  • the distance P corresponding to different optical fingerprint devices can be measured to determine the range of the P value (which can be the preset range described above). ), further, a suitable fingerprint recognition algorithm can be determined based on the preset range to ensure that the distance P can have good fingerprint recognition performance when the distance P is within the preset range, and the optical fingerprint device can be further performed based on the preset range
  • the product card control please refer to the relevant description of the previous embodiment, which will not be repeated here.
  • a part of the optical component 400 may be used to transmit the optical signal used to determine the distance P, and the other part may be used to transmit the optical signal for fingerprint detection.
  • the optical assembly 400 may only include a small number of the first and second collimation holes for measuring the distance P, the other collimation holes are used for fingerprint detection, and the collimation holes are used for fingerprint detection. It may be an oblique hole with the same inclination angle, or it may be a straight hole, which is not limited in the embodiment of the present application.
  • the collimating hole for measuring the distance P can be arranged in the edge area of the optical component, and the collimating hole for fingerprint detection can be arranged in the middle area of the optical component, that is, the optical component in the edge area can be used. Perform distance measurement with the sensor unit in the edge area, and use the optical component in the middle area and the sensor unit in the middle area to perform fingerprint detection, which can reduce the influence of distance measurement on the fingerprint detection function.
  • the optical fingerprint device may further include a filter arranged in the light path from the display screen to the optical sensor, for example, the filter may be arranged at The upper side of the optical component, or the upper surface of the optical sensor, etc.
  • the electronic device 700 may include a display screen 710 and an optical fingerprint device 720, wherein the optical fingerprint device 720 is arranged below the display screen 710 .
  • the optical fingerprint device 720 may be the optical fingerprint device 40 in the foregoing embodiment, and for the specific structure, reference may be made to the related description above, which will not be repeated here.
  • the display screen 710 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).
  • a part of the self-luminous display unit in the display screen can be used as an excitation light source for the biometric identification system to perform biometric identification, and is used to direct the biometrics to the biometric detection area. Emit light signals for biometric detection.
  • the embodiment of the present application also provides a method for measuring distance.
  • the method 800 can be applied to the optical fingerprint device 40 described above or an electronic device installed with the optical fingerprint device 40, wherein the The optical fingerprint device is used to be installed below the display screen of the electronic device, and the method 800 may include the following contents:
  • the distance between the first pattern and the second pattern on the display screen is used to determine the distance between the display screen and the imaging surface of the optical sensor.
  • the method 800 further includes:
  • the distance between the first pattern and the second pattern on the display screen determines the distance between the image of the first pattern and the image of the second pattern, and the first direction and the The angle between the second direction and the normal direction of the display screen determines the distance between the display screen and the imaging surface of the optical sensor.
  • the first direction and the second direction form a first angle with the normal direction of the display screen, and the first direction and the second direction are along the The normal direction of the display screen is symmetrical, wherein, according to the distance between the first pattern and the second pattern on the display screen, the image of the first pattern is different from the image of the second pattern.
  • the distance between the display screen and the angle between the first direction and the second direction and the normal direction of the display screen to determine the distance between the display screen and the imaging surface of the optical sensor includes : Determine the distance P between the display screen and the imaging surface of the optical sensor according to the following formula:
  • the D1 represents the distance between the first pattern and the second pattern on the display screen
  • the D2 represents the distance between the image of the first pattern and the image of the second pattern
  • the ⁇ represents the first angle.
  • the operation of determining the distance between the display screen and the imaging surface of the optical sensor in the method 800 may be performed by the processing module in the optical fingerprint device, or may also be performed by the processing module in the electronic device This embodiment of the application does not limit this.
  • the units can be implemented by electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the interchangeability of hardware and software.
  • the composition and steps of each example have been described generally in terms of function. Whether these functions are performed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the disclosed system and device may be implemented in other ways.
  • the device embodiments described above are 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 also be electrical, mechanical or other forms of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present application.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application is essentially or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium. It includes several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes. .

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Abstract

L'invention concerne un appareil d'empreintes digitales optique, un dispositif électronique et un procédé de mesure de la distance. L'appareil d'empreintes digitales optique est disposé sous un écran d'affichage d'un dispositif électronique, et comprend : un composant optique utilisé pour guider un premier signal optique renvoyé d'un premier motif sur l'écran d'affichage à un capteur optique le long d'une première direction, et guider un second signal optique renvoyé d'un second motif sur l'écran d'affichage au capteur optique le long d'une seconde direction, la première direction et la seconde direction étant différentes ; et le capteur optique utilisé pour recevoir les signaux optiques renvoyés à partir du premier motif et du second motif sur l'écran d'affichage et transmis par le composant optique pour obtenir des images formées par le premier motif et le second motif sur une surface d'imagerie du capteur optique. La distance entre le premier motif et le second motif sur l'écran d'affichage, la distance entre l'image du premier motif et l'image du second motif, un angle inclus entre la première direction et la direction perpendiculaire à l'écran d'affichage, et un angle inclus entre la seconde direction et la direction perpendiculaire à l'écran d'affichage sont utilisés pour déterminer la distance entre l'écran d'affichage et la surface d'imagerie du capteur optique.
PCT/CN2019/108449 2019-09-27 2019-09-27 Appareil d'empreintes digitales optique, dispositif électronique et procédé de mesure de distance WO2021056392A1 (fr)

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CN201980002077.3A CN110832503B (zh) 2019-09-27 2019-09-27 光学指纹装置，电子设备和测量距离的方法

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