WO2020191601A1 - Appareil de reconnaissance d'empreintes digitales et dispositif électronique - Google Patents

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

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Publication number
WO2020191601A1
WO2020191601A1 PCT/CN2019/079598 CN2019079598W WO2020191601A1 WO 2020191601 A1 WO2020191601 A1 WO 2020191601A1 CN 2019079598 W CN2019079598 W CN 2019079598W WO 2020191601 A1 WO2020191601 A1 WO 2020191601A1
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WIPO (PCT)
Prior art keywords
fingerprint
light
optical
display screen
passing holes
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Application number
PCT/CN2019/079598
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English (en)
Chinese (zh)
Inventor
曾利忠
汪海翔
杜灿鸿
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN201980002481.0A priority Critical patent/CN110709860B/zh
Priority to PCT/CN2019/079598 priority patent/WO2020191601A1/fr
Publication of WO2020191601A1 publication Critical patent/WO2020191601A1/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
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • This application relates to the field of optical fingerprint technology, and more specifically, to a fingerprint recognition device and electronic equipment.
  • a screen with a flexible material such as plastic or metal as the base of the screen is called a flexible screen
  • the flexible screen includes two product forms: a curved screen and a foldable flexible screen.
  • the screen of the curved screen is fixed and bent into a certain shape during the production process, and the cover is made of supporting glass. Therefore, the finished curved screen after adding the glass cover does not have "flexible" characteristics.
  • the cover of the foldable flexible screen is made of flexible transparent material, and the finished foldable flexible screen after adding the flexible cover can still be bent and deformed.
  • the existing optical fingerprint recognition solution is to hollow out the middle frame of the fingerprint recognition area. Since there is no middle frame in the fingerprint recognition area to support the screen, when a finger presses the fingerprint recognition area, the screen will collapse, resulting in fingerprints.
  • the screen display in the recognition area is significantly different from the screen display in other areas, which affects the user experience.
  • the transmission of the fingerprint light signal reflected by the finger is affected, and the optical fingerprint recognition performance will also deteriorate.
  • the embodiments of the present application provide a fingerprint identification device and electronic equipment, which can solve the sagging of the flexible display screen caused by the finger pressing during the fingerprint identification process and improve its optical fingerprint identification performance.
  • a fingerprint recognition device which is suitable for electronic equipment with a flexible display screen, and includes: a support structure and an optical fingerprint recognition module;
  • the supporting structure is arranged under the flexible display screen and used to support the flexible display screen;
  • the supporting structure is provided with a plurality of light-passing holes, and the plurality of light-passing holes are used to transmit the fingerprint light signals returned by the reflection or scattering of the human finger above the flexible display screen to the optical Fingerprint recognition module;
  • the optical fingerprint identification module is disposed under the plurality of light-passing holes, and is used for receiving the fingerprint light signal, wherein the fingerprint light signal is used for detecting fingerprint information of the finger.
  • a support structure is provided under the flexible display screen, and a plurality of light-passing holes are provided on the support structure, which can meet the requirements of fingerprint light reflected or scattered by the human finger above the display screen.
  • the signal transmission can also provide support for the flexible display screen in the fingerprint pressing area, reducing the influence of pressing on the screen display, thereby improving the quality of fingerprint detection.
  • the supporting structure is a middle frame of the electronic device.
  • an opening area is provided on the support structure, and a plurality of light passing holes are provided on the opening area.
  • the upper surface of the support structure is on the same plane, and the lower surface of the support structure is formed with a step structure at the edge area of the opening area.
  • the multiple light-passing holes are used to transmit a specific angle fingerprint light signal in the fingerprint light signal, and block a non-specific angle fingerprint light signal in the fingerprint light signal.
  • the optical fingerprint identification module includes a plurality of pixel units, and the plurality of pixel units are used to receive the fingerprint light signal at a specific angle.
  • the fingerprint optical signal at a specific angle is a fingerprint optical signal incident perpendicular to the plurality of light-passing holes.
  • the depth-to-diameter ratio of the plurality of light-passing holes is greater than 10.
  • the center distance of any two adjacent light-passing apertures among the plurality of light-passing apertures is less than 1/2 ⁇ min , where ⁇ min is the minimum value of the fingerprint period.
  • the optical fingerprint identification module includes an optical lens assembly, and the optical lens assembly includes at least one optical lens.
  • the field of view of each of the plurality of light-passing apertures is greater than the field of view of the optical lens assembly.
  • the center distance of any adjacent light-passing hole among the plurality of light-passing holes is greater than 2 ⁇ max , where ⁇ max is the maximum value of the fingerprint period.
  • the multiple light-passing holes are circular holes or polygonal holes with the same size.
  • the plurality of light-passing holes are arranged at specific regular intervals.
  • the arrangement of the plurality of light-passing holes is any one or more of a cross arrangement, a matrix arrangement and a random arrangement.
  • the device further includes: a transparent soft glue layer for connecting the flexible display screen and the supporting structure.
  • the transparent soft glue layer extends into the plurality of light passing holes.
  • the device further includes: a fixing component for fixing the optical fingerprint recognition module on the supporting structure.
  • the opening area is arranged below the fingerprint detection area
  • the optical fingerprint identification module is specifically configured to receive the fingerprint light signal of the fingerprint detection area.
  • the center of the opening area and the center of the fingerprint detection area are both located on the same vertical line perpendicular to the optical fingerprint identification module.
  • an electronic device including: a flexible display screen and the fingerprint recognition device in the first aspect or any possible implementation of the first aspect, wherein the fingerprint recognition device is provided in the flexible Below the display.
  • the fingerprint recognition device is arranged under the non-bending area of the flexible display screen.
  • FIG. 1 is a schematic structural diagram of an electronic device to which an embodiment of the present application is applied.
  • Fig. 2 is a schematic diagram of a partial structure of an electronic device according to an embodiment of the present application.
  • Fig. 3 is a schematic structural diagram of a fingerprint recognition device according to an embodiment of the present application.
  • Fig. 4 is a schematic structural diagram of another fingerprint identification device according to an embodiment of the present application.
  • Fig. 5 is a schematic diagram of the arrangement of light passing holes according to an embodiment of the present application.
  • Fig. 6 is a schematic structural diagram of another fingerprint identification device according to an embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of another fingerprint identification device according to an embodiment of the present application.
  • Fig. 8 is a schematic structural diagram of another fingerprint identification device according to an embodiment of the present application.
  • Fig. 9 is a schematic structural diagram of another fingerprint identification device according to an embodiment of the present application.
  • Fig. 10 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a three-dimensional structure of an electronic device according to an embodiment of the present application.
  • the screens of electronic devices are no longer limited to flat displays, but are moving towards "Bendable”, “Foldable” and “Rollable”
  • the flexible display screen in the bendable state can be bent at a fixed angle; and the foldable and bendable flexible display screen can be bent at will on one surface and any surface.
  • the flexible display screen has the above characteristics, the electronic equipment of the flexible display screen is more beautiful and portable, and has broad application prospects.
  • biometric technology the application of biometrics, especially fingerprint recognition, on electronic devices has become more and more extensive. Therefore, how to achieve high-performance fingerprint recognition on electronic devices with flexible screens has become a popular issue. need.
  • This application provides a technical solution for a fingerprint recognition device suitable for a flexible display screen.
  • the technical solution in the embodiments of this application can be applied to smart phones, tablet computers, wearable devices and other flexible display screens. Mobile terminal or other electronic equipment.
  • the technical solutions of the embodiments of the present application can be used in biometric identification technology.
  • the biometric recognition technology includes but is not limited to fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition.
  • fingerprint recognition technology is an example.
  • the fingerprint identification system of the embodiment of the present application includes an optical fingerprint device.
  • the fingerprint identification device can be arranged in a partial area or the entire area under the flexible display screen to form an under-display optical fingerprint. system.
  • the electronic device 10 includes a flexible display screen 120, a fingerprint recognition device 130, and a middle frame 140.
  • the flexible display screen 120 is specifically a flexible display screen.
  • both the substrate and the cover are made of flexible materials, for example, the substrate is made of plastic or flexible metal, and the cover is made of transparent inorganic film materials.
  • the middle frame 140 is used to support the flexible display screen 120 to prevent the flexible display screen from being deformed when used by the user.
  • the middle frame 140 is provided with a window 141, and the fingerprint recognition device 130 is provided in an area below the window 141.
  • the fingerprint recognition device 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131.
  • the sensing array 133 is located or its sensing area is
  • the fingerprint detection area 103 of the fingerprint recognition device 130 is described.
  • the fingerprint monitoring area 103 is partially or entirely located in the area below the window 141.
  • the fingerprint detection area 103 is located in the display area of the flexible display 120.
  • the flexible display screen 120 may be a flexible display screen with a self-luminous display unit, such as a flexible organic light emitting diode (FOLED) display screen.
  • the fingerprint recognition device 130 can use the display unit (ie, the OLED light source) of the FOLED display 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 target finger 110 above the fingerprint detection area 103.
  • the light 111 is reflected on the surface of the finger 110 to form reflected light or pass through
  • the finger 110 scatters and forms scattered light.
  • the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Because the ridge and valley of the fingerprint have different light reflection capabilities, the reflected light 151 from the fingerprint ridge 101 and the reflected light 152 from the fingerprint ridge 102 have different light intensities. After the reflected light passes through the optical components , The sensor array 134 in the fingerprint recognition 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. The electronic device 10 implements an optical fingerprint recognition function.
  • the flexible display screen 120 may be a flexible display screen without a self-luminous display unit, such as a flexible liquid crystal display (FLCD) display screen.
  • 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 with a specific wavelength of invisible light. It can be arranged under the backlight module of the liquid crystal display or in the edge area under the protective cover of the electronic device 10, and the fingerprint recognition device 130 can be arranged under the edge area of the liquid crystal panel or the protective cover.
  • the fingerprint recognition device 130 It is guided by a light path so that the fingerprint detection light can reach the fingerprint recognition device 130; or, the fingerprint recognition device 130 can also be arranged under the backlight module, and the backlight module passes through the diffuser,
  • the film layers such as the brightness enhancement sheet and the reflective sheet are provided with holes or other optical designs to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the fingerprint identification device 130.
  • the fingerprint recognition device 130 uses a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is consistent with the content described above.
  • the sensing array in the fingerprint recognition device may also be referred to as a pixel array
  • the optical sensing unit or sensing unit in the sensing array may also be referred to as a pixel unit.
  • the fingerprint recognition device in the embodiments of the present application may also be referred to as an optical fingerprint recognition module, a fingerprint recognition module, a fingerprint module, a fingerprint acquisition device, etc., and the above terms can be interchanged.
  • the window 141 has the same shape and size as the fingerprint detection area 103, and is set in the fingerprint detection area. Right above the area 103, the window 141 is filled with air.
  • the flexible display screen 120 collapses in the pressed area, so that the image display of the finger pressing area on the flexible display screen 120 is different from the image display of other areas. Affect user experience.
  • the window 141 is set above the fingerprint detection area 103, and the window 141 is filled
  • the transparent support material 142 is, for example, transparent glass or resin.
  • the transparent filling material 142 in the middle frame 140 and the window 141 cannot be prepared at the same time, it is necessary to strictly control the process parameters to reduce the height difference between the middle frame 140 and the transparent filling material 142. If the upper surface of the transparent filling material 142 is higher than the upper surface of the middle frame 140, the screen above the window 141 appears "bulging", which affects the image display and life of the flexible display 120.
  • the present application provides a fingerprint recognition device and electronic equipment.
  • a support structure is provided under the flexible display screen, and a plurality of light-passing holes are provided on the support structure, which can satisfy the optical signal transmission of fingerprint detection and improve
  • the quality of fingerprint detection can also provide support for the flexible display screen in the fingerprint detection area, reducing the impact of pressing on the screen display.
  • FIG. 3 is a schematic structural diagram of a fingerprint identification device 20 provided by an embodiment of the present application, which is suitable for electronic equipment with a flexible display screen.
  • the fingerprint recognition device 20 may include: a supporting structure 200 and an optical fingerprint recognition module 300;
  • the supporting structure 200 is arranged under the flexible display screen 120 for supporting the flexible display screen 120;
  • the support structure 200 is provided with a plurality of light-passing holes 210, and the plurality of light-passing holes 210 are used to transmit the fingerprint light signal returned by the reflection or scattering of the human finger above the display screen to the The optical fingerprint recognition module 300;
  • the optical fingerprint identification module 300 is disposed under the plurality of light-passing holes 210, and is used to receive the fingerprint light signal, wherein the fingerprint light signal is used to detect fingerprint information of the finger.
  • the supporting structure 200 may be the middle frame 140 in FIG. 1.
  • the supporting structure 200 may also be a supporting layer with sufficient strength to realize the support and protection of the flexible display screen 120.
  • the supporting structure 200 is a thin steel sheet, the steel sheet is arranged under the flexible display screen, the area of the steel sheet is greater than or equal to the display area of the flexible display screen, and the steel sheet can be completely The entire display area of the flexible display screen 120 is supported.
  • the supporting structure 200 may be composed of any supporting material, which is not limited in the embodiment of the present application.
  • an opening area 201 is provided on the supporting structure 200, the opening area 201 is provided with a plurality of light-passing holes 210, and the opening area 201 is polygonal or circular.
  • the upper surface of the support structure 200 is on the same plane, and the lower surface of the support structure 200 extends at the edge area of the opening area 201 to form a step structure.
  • the lower surface of the support structure 200 extends upward at the edge area of the opening area 201 to form a groove structure.
  • the supporting structure 200 is a middle frame, and the upper surface of the middle frame is on the same plane, and is used to support the flexible display screen 120 above the middle frame.
  • the edge of the lower surface open area 201 forms a groove structure upwards, so that the thickness of the support structure 200 at the open area 201 is smaller than the thickness of other areas, and the support structure 200 is located below the open area 201.
  • the surface is higher than the lower surface of other areas. In the above case, under the same process conditions, the depth-to-diameter ratio of the light-passing hole on the opening area can be reduced, and the fingerprint light signal received by the light-passing hole can be increased.
  • the lower surface of the supporting structure 200 extends downwardly at the edge area of the opening area 201 to form a convex structure.
  • the supporting structure 200 is a middle frame, and the upper surface of the middle frame is on the same plane, and is used to support the flexible display screen 120 above the middle frame.
  • the edge of the lower surface opening area 201 forms a convex structure downward, so that the thickness of the support structure 200 at the opening area 201 is greater than the thickness of other areas.
  • the bottom surface is lower than the bottom surface of other areas.
  • the plurality of light-transmitting small holes 210 are circular small holes or polygonal small holes.
  • the shape and size of the plurality of light-passing holes 210 may be the same. It should be understood that the shape and size of the plurality of light-passing holes 210 may also be different, which is not limited in the embodiment of the present application.
  • the plurality of light-passing holes 210 are arranged at specific regular intervals. A certain interval is maintained between adjacent light-passing holes 210 to provide support.
  • the arrangement of the plurality of light-passing holes 210 is any one or more of cross arrangement, matrix arrangement and random arrangement.
  • the plurality of circular light-passing holes 210 are all circular holes with the same shape and size, and the plurality of circular small holes 210 The holes are arranged in a matrix, and the distance between every two adjacent circular light-passing holes is the same.
  • the plurality of circular light-passing holes 210 are all circular holes with the same shape and size, and the plurality of circular holes 210 The circular light-transmitting holes are arranged alternately at intervals, and the distance between every two adjacent circular light-transmitting holes is the same.
  • the plurality of circular light-passing holes 210 are all square holes with the same shape and size, and the plurality of square holes The light-passing holes are arranged in a matrix, and the distance between every two adjacent circular light-passing holes is the same.
  • the plurality of circular light-passing holes 210 are all regular hexagonal holes with the same shape and size, and the plurality of circular holes 210
  • the regular hexagonal light-passing holes are arranged alternately at intervals, and the distance between every two adjacent regular hexagonal light-passing holes is the same.
  • a micro-nano machining process or a nano-printing process can be used to prepare the multiple light-passing holes 210 on the opening area 201.
  • a micro-nano machining process is used to make small holes on the support structure.
  • Pattern lithography is to etch the supporting structure material at the hole pattern to form multiple light-passing holes.
  • the area of the plurality of light-passing holes 210 on the perforated area 201 is a photosensitive area for transmitting the fingerprint light signal to the optical fingerprint recognition module 300, and the perforated area The area on the 201 except the multiple light-passing holes 210 is a non-photosensitive area and cannot transmit the fingerprint light signal. It should be understood that the greater the ratio of the area of the photosensitive area to the area of the aperture area, the greater the light intensity of the fingerprint light signal transmitted to the light detection array 320.
  • the optical fingerprint identification module 300 may include a light detection array 320, and the light detection array 320 includes a pixel array 322 of a plurality of pixel units 321, so The pixel array 322 of the plurality of pixel units 321 may be the sensing array 133 of the plurality of optical sensing units 131 in FIG. 1.
  • the pixel array 322 and the reading circuit and other auxiliary circuits electrically connected to the pixel array may be fabricated on a chip (Die) through a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor.
  • the pixel array 322 is specifically a photodetector (photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can serve as the pixel unit 321 described above.
  • the optical fingerprint recognition module 300 may further include an optical component 310, which may be arranged above the pixel array of the light detection array 320, which may specifically include a light guide layer and a light filter layer. (Filter) and other optical elements, the filter layer can be used to filter the ambient light penetrating the finger, and the light guide layer is mainly used to guide the fingerprint light signal reflected from the finger surface to the pixel array Perform optical inspection.
  • an optical component 310 which may be arranged above the pixel array of the light detection array 320, which may specifically include a light guide layer and a light filter layer. (Filter) and other optical elements, the filter layer can be used to filter the ambient light penetrating the finger, and the light guide layer is mainly used to guide the fingerprint light signal reflected from the finger surface to the pixel array Perform optical inspection.
  • the light guide layer of the optical component 310 has multiple implementation schemes.
  • the light guide layer 311 may specifically be a collimator layer fabricated on a semiconductor silicon wafer, which has multiple A collimating unit or a micro-hole array
  • the collimating unit may be specifically a small hole, from the fingerprint light signal reflected from the finger, the light that is perpendicularly incident on the collimating unit can pass through and be received by the pixel unit below it, The light with an excessively large incident angle is attenuated by multiple reflections inside the collimating unit, so each pixel unit 321 can basically only receive the fingerprint light signal directly above it, so that the pixel array 322 can detect Take out the fingerprint image of the finger.
  • 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 reflect fingerprints from fingers.
  • the light signal is converged to the pixel array of the light detection array 320 below it, so that the pixel array 322 can perform imaging based on the fingerprint light signal, thereby processing the fingerprint image signal 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 recognition module 300 to improve The fingerprint imaging effect of the optical fingerprint identification module 300.
  • the light guide layer may also be a micro-lens (Micro-Lens) layer, and the micro-lens layer has a micro-lens array formed by a plurality of micro-lens, which may be formed in the place by a semiconductor growth process or other processes.
  • the micro-lens layer has a micro-lens array formed by a plurality of micro-lens, which may be formed in the place by a semiconductor growth process or other processes.
  • each microlens may correspond to one of the pixel units 321 of the pixel array 322, respectively.
  • other optical film layers may be formed between the micro lens layer and the pixel unit, such as a dielectric layer or a passivation layer.
  • the micro lens layer and the pixel 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 pixel unit, the light blocking layer can block the optical interference between the adjacent micro lens and the pixel unit, and make the pixel
  • the light corresponding to the unit is condensed into the microhole through the microlens and is transmitted to the pixel unit through the microhole for optical fingerprint imaging.
  • a microlens layer can be further provided under the collimator layer or the optical lens layer.
  • the collimator layer or the optical lens layer is used in combination with the micro lens layer, its specific laminated structure or optical path may need to be adjusted according to actual needs.
  • the optical assembly 310 and the light detection array 320 may be packaged in the same optical fingerprint component.
  • the optical component 310 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 310 can be arranged outside the chip where the optical detection array 320 is located, for example, the optical component 310 is attached above the chip, or some components of the optical assembly 310 are integrated into the chip.
  • the embodiments of the present application are not limited.
  • the fingerprint recognition device 20 may further include a transparent glue layer 400 for connecting the flexible display screen 120 and the supporting structure 200.
  • the supporting structure 200 can be fully bonded to the flexible display screen 120 through a transparent soft glue layer 400.
  • the transparent soft glue layer 400 can be a transparent and soft silicone layer, or other transparent liquid glue or transparent. Soft glue.
  • the plurality of light-passing holes 210 on the support structure 200 may be filled with a transparent soft glue layer 400, or may be filled with air.
  • the fingerprint recognition device 20 may further include a fixing component 500 for fixing the optical fingerprint recognition module 300 on the supporting structure 200.
  • the optical fingerprint recognition module 300 can be fixed to the supporting structure 200 by means of screw mounting and fixing, glue bonding, welding, or coupling fixing. on.
  • the fixing component 500 may be a component structure corresponding to the aforementioned fixing method.
  • the design solutions of the shape and size of the plurality of light-passing holes are different.
  • the optical fingerprint recognition module 300 includes a light detection array 320, and the light detection array 320 includes a plurality of pixel units 321.
  • the plurality of light-passing holes 210 are used to transmit the fingerprint light signal at a specific angle in the fingerprint light signal, and block the fingerprint light signal at a non-specific angle in the fingerprint light signal.
  • the multiple pixel units 321 in the light detection array 320 receive the special angle fingerprint light signal.
  • the fingerprint optical signal at a specific angle includes the fingerprint optical signal incident perpendicular to the plurality of light-passing holes 210.
  • the fingerprint optical signal at a specific angle further includes an optical signal incident approximately perpendicular to the plurality of light-passing holes 210.
  • the fingerprint light signal at a specific angle may also include fingerprint light signals incident non-perpendicularly to the plurality of light-passing holes 210, which is not limited in the embodiment of the present application.
  • the plurality of light-passing apertures 210 are used to transmit fingerprint light signals incident substantially perpendicular to the plurality of light-passing apertures.
  • the plurality of light-passing apertures 210 may also be referred to as collimators.
  • the light aperture 210 is a collimating unit. Specifically, the fingerprint light signal incident substantially perpendicularly to the plurality of light-passing holes 210 is transmitted to the plurality of pixel units 321 by the plurality of light-passing holes 210, and is incident to the plurality of light-passing holes 210 at a large angle.
  • the optical signal of the optical aperture 210 is attenuated by multiple reflections inside the plurality of light-passing apertures 210 and cannot be transmitted to the plurality of pixel units 321. Therefore, each pixel unit 321 receives the signal directly above it. Fingerprint optical signal, so that the plurality of pixel units 321 can detect the fingerprint image of the finger.
  • the diameter of the light-transmitting aperture 210 is the smallest diameter of the light-transmitting aperture 210.
  • the period of the plurality of light-passing holes 210 is the distance between the centers of two adjacent light-passing holes;
  • the small holes 210 have different shapes and sizes, the center distances of two adjacent light-passing holes are different, and the smallest center distance is the period of the plurality of light-passing holes 210.
  • the diameter of the plurality of light-passing holes 210 is larger than a first preset value, so as to transmit enough light for imaging.
  • the diameter of the plurality of light-passing holes 210 is also smaller than the second preset value to ensure that light signals incident on the plurality of light-passing holes 210 at a large angle are blocked.
  • the period of the plurality of light-passing holes 210 is also smaller than the third preset value to distinguish it from the period of the fingerprint pattern and facilitate the processing of the fingerprint image.
  • the parameters of the plurality of light-passing holes 210 can be set to maximize the fingerprint light signal of a fingerprint crest and/or a fingerprint ridge incident substantially vertically downward in the corresponding area above the optical fingerprint identification module 300 Is transmitted to the light detection array 320, while maximizing the blocking of other light signals.
  • the ridge period length of the finger fingerprint is between ⁇ min and ⁇ max , that is, the distance between two adjacent ridges or two adjacent ridges on the fingerprint is at least ⁇ min , and the plurality of light passes In the small holes 210, the period of the plurality of light-passing small holes 210 is less than 1/2 ⁇ min , and the 1/2 ⁇ min is the aforementioned third preset value.
  • the pattern period of the finger fingerprint is at least 200 ⁇ m.
  • the plurality of light-passing holes 210 are shown in (a) and (b) in FIG. 5, the circular light-passing holes and the adjacent circles The center distance of the light-through hole is less than 100 ⁇ m.
  • the depth of the plurality of light-through holes 210 is D, that is, the thickness of the support structure is D, and the depth-to-diameter ratio of the plurality of light-through holes 210 is greater than or equal to 10, that is, the multiple The depth-to-diameter ratio of the light-passing hole 210 is greater than or equal to 10.
  • the first preset value and the second preset value are determined by calculating the depth-to-diameter ratio of the plurality of light-passing holes 210.
  • the thickness D of the support structure can be set according to the diameter of the plurality of light-passing holes 210.
  • the optical fingerprint recognition module 300 may further include an optical component 310, wherein the optical component 310 may include a collimating layer 311 for further selection of incident fingerprint light signals.
  • the multiple small holes on the collimating layer 311 may have the same shape and size as the multiple light-passing small holes 210 on the support structure 200 and have a one-to-one correspondence.
  • the plurality of small holes on the collimating layer 311 may be smaller than the plurality of light passing holes 210 on the support structure 200, for example, one light passing hole 210 corresponds to the plurality of small holes on the collimating layer , That is, multiple small holes on the collimating layer all receive the optical signal transmitted by the same light-passing small hole.
  • the optical assembly 310 may further include a filter layer 312.
  • the filter layer 312 may be an infrared cut filter, which is used to filter out optical signals in the infrared band, which is beneficial to reduce the influence of ambient light signals such as infrared light, thereby improving fingerprint recognition performance.
  • the filter layer 312 may be disposed between the collimating layer 311 and the light detection array 320, or may be disposed above the collimating layer 311.
  • a blue filter material can be coated on the photodetection array 320, or a blue filter can be provided, so that the fingerprint image collected by the photodetection array 320 is a blue fingerprint image, that is, the red band and blue are filtered out. Fingerprint optical signal in color band and infrared band.
  • the fingerprint recognition device 20 may further include a transparent soft glue layer 400 and a fixing component 500.
  • the optical fingerprint recognition module 300 includes an optical component 310 and a light detection array 320.
  • the light detection array 320 includes a plurality of pixel units 321.
  • the optical assembly 310 may include an optical lens assembly 313.
  • the optical lens assembly 313 includes at least one optical lens.
  • the optical lens assembly 313 is a lens group composed of one or more optical lenses, or the optical lens assembly 313 is a micro lens array composed of multiple micro lenses.
  • a plurality of light-passing holes 210 on the opening area 201 are used to transmit the fingerprint light signal to the optical lens assembly 313, and one light-passing hole transmits the fingerprint light signal unit, the
  • the fingerprint light signal unit is the light signal reflected by a part of the area on the finger.
  • the optical lens assembly 313 images a plurality of fingerprint light signal units, and the plurality of pixel units 321 receive the light signal after passing through the optical lens assembly 313. Imaging fingerprint light signal units, and processing the multiple imaging fingerprint light signal units to obtain fingerprint image signals.
  • the depth-to-diameter ratio of the plurality of light-passing apertures 210 is less than a fourth preset value, so as to expand the field of view (FOV) angle of the plurality of light-passing apertures 210 to prevent loss Fingerprint optical signal of a partial area of the finger.
  • the diameter of the plurality of light-passing holes 210 should also be smaller than the fifth preset value, so as to ensure that when a finger presses on the light-passing holes, the flexible display screen generates depressions and affects image display.
  • the period of the plurality of light-passing holes is also greater than the sixth preset value to distinguish it from the period of the fingerprint pattern and facilitate the processing of the fingerprint image. That is to say, the parameters of the plurality of light-passing holes 210 can be set such that the light detection array 320 can receive the fingerprint light signal of the entire area of the finger to the maximum, without affecting the display of the flexible display screen 120.
  • the ridge period length of the finger fingerprint is between ⁇ min and ⁇ max , that is, the distance between two adjacent ridges or two adjacent ridges on the fingerprint is at most ⁇ max .
  • the period of the plurality of light-passing apertures 210 is greater than 2 ⁇ min
  • the 2 ⁇ max is the aforementioned sixth preset value.
  • the pattern period of the finger fingerprint is at most 1mm.
  • the field angle of the plurality of light-passing holes 210 is greater than the field angle of the optical lens assembly 313.
  • the depth-to-diameter ratio of the plurality of light-passing apertures 210 determines the angle of view of the plurality of light-passing apertures. When the depth of the light-passing apertures 210 is smaller, the diameter is larger, The viewing angle of the light-passing hole 210 is larger. The depth-to-diameter ratio of the plurality of light-passing holes 210 is determined by the angle of view, so as to determine the foregoing fourth preset value.
  • the fifth preset value is determined by the effect of a finger pressing the flexible display screen 120 at the light-passing hole.
  • the optical component 310 may further include a filter layer 312.
  • the fingerprint recognition device 20 may further include a transparent soft glue layer 400 and a fixing component 500.
  • the sensing area of the pixel array 322 in the light detection array 320 on the flexible display screen 120 is the fingerprint detection area 301 of the optical fingerprint identification module 300, that is, the finger is placed on the When in the fingerprint detection area 301 on the flexible display screen 120, the pixel array 322 in the light detection array 320 can receive the fingerprint light signal reflected by the finger.
  • the fingerprint detection area 301 is located in the display area of the flexible display screen 120.
  • the optical fingerprint recognition module 300 is disposed under the display area of the flexible display screen 120.
  • the optical fingerprint recognition module 300 may also be arranged in other positions, such as the side of the flexible display 120 or the non-transparent area of the edge of the electronic device, and pass through the light path. It is designed to guide the fingerprint light signal reflected by the finger to the optical fingerprint identification module 300, so that the fingerprint detection area 301 is actually located in the display area of the flexible display 120.
  • the area of the fingerprint detection area 301 may be the same as the area of the pixel array 322.
  • the fingerprint detection area 301 has the same shape and size as the pixel array 322, and is located in the pixel array. Right above the array 322.
  • the area of the fingerprint detection area 301 may also be different from the area of the pixel array 322, for example, through a light path design such as lens imaging, a reflective folding light path design, or other light converging or reflection light path design,
  • the area of the fingerprint detection area 301 is larger than the area of the pixel array 322.
  • the electronic device with the above structure does not need to reserve space on the front side to set the fingerprint button (such as the Home button), so that a full screen solution can be adopted, that is, the display area of the flexible display 120 It can be basically extended to the front of the entire electronic device.
  • the light detection array 320 in the optical fingerprint recognition module 300 may be an optical fingerprint sensor.
  • the fingerprint detection area 301 of the optical fingerprint recognition module 300 has a small area and a fixed position.
  • the light detection array 320 in the optical fingerprint recognition module 300 may specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors may be arranged side by side under the flexible display screen 120 by splicing. Part of the area or the entire area, and the sensing areas of the multiple optical fingerprint sensors collectively constitute the fingerprint detection area 301 of the optical fingerprint identification module 300.
  • the fingerprint detection area 301 of the optical fingerprint recognition module 300 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 detection area 301 of the optical fingerprint recognition module 300 It can be expanded to the main area of the lower half of the flexible display screen 120, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation.
  • the fingerprint detection area 301 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 perforated area 201 is arranged below the fingerprint detection area 301.
  • the perforated area 201 is arranged directly below the fingerprint detection area 301, and the center of the perforated area 201 and the center of the fingerprint detection area 301 are both located at the same vertical to the pixel array 322. Vertical line.
  • the shape and size of the aperture area 201 is the same as the shape and size of the fingerprint detection area 301.
  • the fingerprint detection area 301, the aperture area 201, and the pixels The shape and size of the array 322 are the same, and the center of the fingerprint detection area 301, the center of the aperture area 201 and the center of the pixel array 322 are all located on the same vertical line perpendicular to the pixel array 322.
  • the shape and size of the aperture area 201 is different from the fingerprint detection area 301.
  • the opening area is a square
  • the fingerprint detection area is a circle.
  • an embodiment of the present application also provides an electronic device 30.
  • the electronic device 30 may include a flexible display 120 and the fingerprint identification device 20 of the foregoing embodiment of the application, wherein the fingerprint identification device 20 is arranged under the flexible display screen 120.
  • the electronic device 30 can be any electronic device with a flexible display screen 120.
  • the electronic device 30 may also be referred to as a foldable electronic device.
  • the foldable electronic device 30 has a variety of folding forms and appearance forms. As shown in FIG. 11, the first area 121 on the flexible display screen 120 is the bending area of the flexible display screen 120. The upper second area 122 and the third area 123 are non-bending areas of the flexible display screen 120.
  • FIG. 11 is a schematic diagram of the appearance of an outwardly foldable electronic device 30. When the electronic device is in a folded state, the flexible display screen 120 is on the surface of the electronic device.
  • (A) in FIG. 11 is a schematic diagram of the appearance of the inverted foldable electronic device 30. When the electronic device is in a folded state, the flexible display screen 120 is inside the electronic device.
  • the fingerprint recognition device 20 is provided with a non-bending area of the flexible display screen 120, for example, provided in all or a partial area below the second area 122 and/or the third area 123. As shown in (a) of FIG. 11, the fingerprint recognition device 20 is arranged in a partial area below the third area 123. As shown in (b) of FIG. 11, the fingerprint recognition device 20 is arranged in a partial area below the second area 122.
  • the units can be implemented by electronic hardware, computer software, or a combination of both, in order to clearly illustrate the interchangeability of hardware and software.
  • the composition and steps of each example have been described generally in terms of function. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the disclosed system and device may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present application.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application is essentially or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium It includes several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un appareil de reconnaissance d'empreintes digitales et un dispositif électronique, qui peuvent empêcher la dépression d'un écran d'affichage souple provoqués par la pression d'un doigt pendant la reconnaissance d'empreintes digitales, améliorent les performances de reconnaissance d'empreintes digitales optiques. L'appareil de reconnaissance d'empreintes digitales comprend : une structure de support et un module de reconnaissance d'empreintes digitales optique ; la structure de support est disposée au-dessous de l'écran d'affichage souple et est utilisée pour supporter l'écran d'affichage souple ; la structure de support est pourvue d'une pluralité de trous de transmission de lumière, et la pluralité de trous de transmission de lumière sont utilisés pour transmettre, au module de reconnaissance optique d'empreintes digitales, un signal optique d'empreintes digitales renvoyé par réflexion ou diffusion d'un doigt au-dessus de l'écran d'affichage souple ; le module de reconnaissance d'empreintes digitales optique est disposé au-dessous de la pluralité de trous de transmission de lumière et est utilisé pour recevoir le signal optique d'empreintes digitales, et le signal optique d'empreintes digitales est utilisé pour détecter des informations d'empreintes digitales du doigt.
PCT/CN2019/079598 2019-03-25 2019-03-25 Appareil de reconnaissance d'empreintes digitales et dispositif électronique WO2020191601A1 (fr)

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CN201980002481.0A CN110709860B (zh) 2019-03-25 2019-03-25 指纹识别的装置和电子设备
PCT/CN2019/079598 WO2020191601A1 (fr) 2019-03-25 2019-03-25 Appareil de reconnaissance d'empreintes digitales et dispositif électronique

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