WO2021147012A1 - Dispositif de reconnaissance d'empreintes digitales et appareil électronique - Google Patents

Dispositif de reconnaissance d'empreintes digitales et appareil électronique Download PDF

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Publication number
WO2021147012A1
WO2021147012A1 PCT/CN2020/073861 CN2020073861W WO2021147012A1 WO 2021147012 A1 WO2021147012 A1 WO 2021147012A1 CN 2020073861 W CN2020073861 W CN 2020073861W WO 2021147012 A1 WO2021147012 A1 WO 2021147012A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical fingerprint
fingerprint identification
optical
identification device
Prior art date
Application number
PCT/CN2020/073861
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English (en)
Chinese (zh)
Inventor
葛丛
刘杨赞
蔡斐欣
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
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/CN2020/073861 priority Critical patent/WO2021147012A1/fr
Priority to CN202080001556.6A priority patent/CN111837129A/zh
Publication of WO2021147012A1 publication Critical patent/WO2021147012A1/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
    • 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
    • H10K59/40—OLEDs integrated with touch screens

Definitions

  • This application relates to the field of biometric identification technology, and in particular to an optical fingerprint identification device and electronic equipment.
  • the under-screen fingerprint identification technology is an identification technology that sets a fingerprint identification component below the display screen and uses optical principles to obtain the user's fingerprint.
  • display screens include Liquid Crystal Display (LCD) screens and Organic Light-Emitting Diode (OLED) screens. Take LCD screens as an example.
  • support screens The LCD touch screen with fingerprint recognition function includes a fingerprint recognition module, a display panel, and a backlight module located below the display panel.
  • the backlight module includes a color filter, a polarizer, a prism film, a diffuser, and a light guide plate.
  • a backlight module is required to provide a light source for the screen.
  • the light emitted by the light source passes through the light guide plate to form a surface light source.
  • the surface light source passes through the diffuser, prism film and polarizer to form light with a certain polarization .
  • the prism film in the backlight module is used to shrink the light from the central viewing angle and increase the display brightness at the front view angle, but the fingerprint detection light emitted from the finger enters the fingerprint recognition module through the LCD screen, and it will have black lines.
  • the discontinuous field of view area causes the characteristic signal of the fingerprint to be lost, which affects the fingerprint recognition function.
  • the embodiments of the present application provide an optical fingerprint identification device and electronic equipment to overcome the problem of poor optical fingerprint identification function.
  • the embodiment of the application provides an optical fingerprint identification device, which is suitable for electronic equipment with a liquid crystal display to realize under-screen optical fingerprint detection;
  • the optical fingerprint identification device includes a fingerprint identification module arranged on the backlight side of the liquid crystal display
  • the light path guide assembly includes a reflective assembly and a lens set sequentially arranged from the object side to the image side.
  • the fingerprint detection light passing through the liquid crystal display is reflected by the reflective assembly to form reflected light.
  • the lens group is used to converge the reflected light onto the fingerprint identification module;
  • the reflecting assembly includes at least one reflecting mirror, the lens group includes a first lens, a second lens, and a third lens that are on the same optical axis, and the first lens, the second lens, and the third lens are respectively At least one of the lenses is an aspheric lens.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: 0 ⁇
  • optical fingerprint identification device as described above, wherein the lens group satisfies: -2 ⁇ f1/R1 ⁇ 50, f1 is the focal length of the first lens; R1 is the curvature of the first lens near the object side radius.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: 0 ⁇ f1/R2 ⁇ 10, and R2 is the radius of curvature of the first lens close to the image side.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: -5 ⁇ f2/R3 ⁇ 8, f2 is the focal length of the second lens; R3 is the curvature of the second lens near the object side radius.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: 0 ⁇ f2/R4 ⁇ 10, and R4 is the radius of curvature of the second lens close to the image side.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: -240 ⁇ f3/R5 ⁇ 0, f3 is the focal length of the third lens; R5 is the curvature of the third lens near the object side radius.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: 0 ⁇ f3/R6 ⁇ 210, and R6 is the radius of curvature of the third lens near the image side.
  • CT1 is the central thickness of the first lens
  • CT2 is the central thickness of the second lens
  • optical fingerprint identification device as described above, wherein the lens group satisfies: 0 ⁇ CT2/CT3 ⁇ 3, and CT3 is the central thickness of the third lens.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: the refractive index of the first lens n1>1.50, and the dispersion coefficient of the first lens v1>20.0.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: the refractive index of the second lens n2>1.50, and the dispersion coefficient of the second lens v2>20.0.
  • optical fingerprint identification device as described above, wherein the lens group satisfies: the refractive index of the third lens n3>1.50, and the dispersion coefficient of the third lens v3>20.0.
  • the lens group satisfies: in the field of view with a maximum angle of view FOV ⁇ 120°, the distortion is less than 5%.
  • the reflective component includes a reflective mirror
  • the reflective mirror includes a reflective surface
  • the angle between the reflective surface and the liquid crystal display is an acute angle
  • the fingerprint identification module includes an optical fingerprint sensor chip
  • the reflected light is irradiated to the light receiving surface of the optical fingerprint sensor chip, and the light of the optical fingerprint sensor chip receives The surface is arranged perpendicular to the liquid crystal display screen.
  • the reflective component includes a first reflective mirror and a second reflective mirror
  • the first reflective mirror includes a first reflective surface
  • the second reflective mirror includes a second reflective surface
  • the first reflective surface is parallel to the second reflective surface, and the angle between the first reflective surface and the liquid crystal display is an acute angle; the fingerprint detection light forms a first reflective surface after passing through the first reflective surface. Reflected light, the first reflected light forms a second reflected light after passing through the second reflective surface.
  • the fingerprint identification module includes an optical fingerprint sensor chip
  • the reflected light is irradiated to the light receiving surface of the optical fingerprint sensor chip, and the light of the optical fingerprint sensor chip receives The surface is arranged in parallel with the liquid crystal display screen.
  • optical fingerprint identification device as described above, wherein the optical fingerprint sensor chip is used to be carried on a flexible circuit board and electrically connected to the flexible circuit board, and the optical fingerprint sensor chip includes a plurality of optical sensors.
  • the optical sensor array of the unit is described above, wherein the optical fingerprint sensor chip is used to be carried on a flexible circuit board and electrically connected to the flexible circuit board, and the optical fingerprint sensor chip includes a plurality of optical sensors.
  • the optical sensor array of the unit is described above, wherein the optical fingerprint sensor chip is used to be carried on a flexible circuit board and electrically connected to the flexible circuit board, and the optical fingerprint sensor chip includes a plurality of optical sensors.
  • the optical path guide assembly further includes a lens barrel or a lens holder for carrying the lens group, and the lens barrel or the lens holder is arranged above the flexible circuit board and is connected to the flexible circuit board.
  • the flexible circuit board forms a confined space, and the optical sensing array is arranged in the confined space and located in the converging light path of the lens group; wherein the lens group is used to guide or guide the reflected light. Converging to the optical sensing array to realize the optical fingerprint imaging of the finger on the optical sensing array.
  • the fingerprint identification module further includes a filter for filtering out interference light, and the filter is arranged on the optical fingerprint sensor chip facing one of the lens groups. side.
  • optical fingerprint identification device as described above, wherein the filter is adhered to the optical fingerprint sensor chip through a filter adhesive.
  • optical path guide assembly further includes an aperture, and the aperture is arranged between the reflection assembly and the lens group, or the first lens and the second lens Between the lenses.
  • An embodiment of the application provides an electronic device including a liquid crystal display screen and an optical fingerprint identification device.
  • the optical fingerprint identification device is disposed under a backlight module of the liquid crystal display screen to realize under-screen optical fingerprint detection.
  • the optical fingerprint identification device and electronic equipment provided by the embodiments of the present application are suitable for electronic equipment with a liquid crystal display screen to realize under-screen optical fingerprint detection, and the optical fingerprint identification device includes an optical fingerprint identification device provided on the liquid crystal display screen.
  • the fingerprint recognition module and the light path guide component under the backlight module of the, and the fingerprint detection area is at least partly located in the display area of the liquid crystal display, the finger touching the fingerprint detection area forms a fingerprint information carrying the fingerprint of the finger Fingerprint detection light;
  • the optical path guide component includes a reflective component and a lens group in turn from the object side to the image side. After the fingerprint detection light passes through the liquid crystal display, it is reflected by the reflective component to form reflected light.
  • the lens The group is used to guide or converge the reflected light onto the fingerprint recognition module to realize the optical fingerprint imaging of the finger;
  • the reflection component includes at least one mirror, and the lens group sequentially includes a second lens from the object side to the image side.
  • a lens, a second lens and a third lens, at least one lens in the lens group is an aspheric lens.
  • the reflective component can change the propagation direction of the fingerprint detection light, which can effectively increase the object distance of the optical fingerprint identification device, so that a large focal length lens can be used to achieve under-screen fingerprint detection or Recognition.
  • the use of reflective components can effectively collect signal light at a specific angle, and in particular can increase the amount of edge signal collection of the fingerprint recognition area of the optical fingerprint detection module, increase the recognition visual field, and increase the recognition field of view, thereby improving the The fingerprint recognition effect of the optical fingerprint detection module.
  • the greater the focal length, the greater the magnification, and the larger the "petals" of the obtained image which is beneficial to increase the area of the effective recognition area, thereby increasing the accuracy of fingerprint recognition.
  • the embodiment of the present application can also reduce the volume of the optical fingerprint identification device. For example, the thickness of the optical fingerprint identification device can be reduced by the reflective component, and correspondingly, the usability of the optical fingerprint identification device is increased.
  • Figure 1 is a schematic diagram of the imaging principle of a double-layer prism film
  • FIG. 2 is a schematic diagram of the optical fingerprint identification device provided in the first embodiment of the application installed in a liquid crystal display;
  • Fig. 3 is a curve of astigmatism and distortion of the lens group in the first embodiment of the application
  • FIG. 4 is a curve of the imaging quality of the lens group in the first embodiment of the application.
  • FIG. 5 is a schematic diagram of the optical fingerprint identification device provided in the second embodiment of the application installed in a liquid crystal display
  • FIG. 7 is a curve of the imaging quality of the lens group in the second embodiment of the application.
  • FIG. 8 is a schematic diagram of the optical fingerprint identification device provided in the third embodiment of the application installed in a liquid crystal display
  • FIG. 10 is a curve of the imaging quality of the lens group in the third embodiment of the application.
  • FIG. 11 is a schematic diagram of the optical fingerprint identification device provided in the fourth embodiment of the application installed in a liquid crystal display;
  • FIG. 12 is a curve of astigmatism and distortion of the lens group in the fourth embodiment of the application.
  • FIG. 13 is a curve of the imaging quality of the lens group in the fourth embodiment of the application.
  • 10- liquid crystal display screen 11- prism film; 21- mirror; 22- first mirror; 23- second mirror; 31- first lens; 32- second lens; 33- third lens; 40- Aperture; 50-filter; 60-fingerprint recognition module.
  • the optical fingerprint identification device provided in the embodiments of this application is suitable for electronic equipment with LCD display screens or OLED displays.
  • the following embodiments describe the application of the optical fingerprint identification device to LCD display screens, that is, liquid crystal display screens as an example; the liquid crystal display screen is A passive light-emitting display device whose display panel itself cannot emit light, and generally needs to use a backlight module behind the display module to illuminate the display panel to display images.
  • the backlight module usually includes a polarizer, a prism film, a diffuser and a light guide plate.
  • the white light emitted by the light source passes through the light guide plate to form a surface light source.
  • the diffuser, the prism film and the polarizer the white light with a certain polarization state is formed, and finally passes through the liquid crystal.
  • the color filter in the display completes the display.
  • the backlight module in order to ensure the display brightness of the liquid crystal display, especially the display brightness of the front view angle, the backlight module is usually provided with two superimposed prism films placed orthogonally in the horizontal direction, because the light passes through the light guide plate and After the diffuser, the divergence angle becomes larger, and it needs to be folded by a prism film.
  • the use of two prism films can separately gather the light in the X-axis and Y-axis directions, thereby improving the display brightness.
  • Figure 1 is a schematic diagram of the imaging principle of the double-layer prism film: the fingerprint detection light formed by the finger touching the liquid crystal display 10 passes through the two layers of prism film 11, and is divided into four and formed on the fingerprint recognition module In the discontinuous field of view area of the "quadrule shape", the discontinuity and distortion of the field of view will cause the characteristic signal of the fingerprint to be lost, and the fingerprint recognition function cannot be completed. Finally, the optical fingerprint recognition cannot be realized in the liquid crystal display 10.
  • the embodiment of this application passes The reflective component and lens group are arranged to increase the object distance and focal length, so that the pattern formed on the fingerprint recognition module is larger and clearer, so as to improve the effect of fingerprint recognition.
  • the optical fingerprint identification device provided by the embodiment of the present application can be applied to a mobile phone, a tablet computer, or other smart terminals with a liquid crystal display screen or other electronic devices.
  • the optical fingerprint recognition device includes a fingerprint recognition module 60 and a light path guide assembly arranged on the backlight side of the liquid crystal display 10, and the light path guide assembly includes a reflective assembly and a lens group arranged in sequence from the object side to the image side.
  • the fingerprint detection light passing through the liquid crystal display screen 10 is reflected by the reflective component to form reflected light, and the lens group is used to converge the reflected light onto the fingerprint identification module 60 to realize optical fingerprint imaging of the finger.
  • the optical fingerprint identification device can be used in different scenarios, corresponding to different application scenarios, and the object side and the image side are also different.
  • the optical fingerprint identification device can be set in a terminal device.
  • the aforementioned object side can be the surface of the display screen of the terminal device, and the surface of the display screen is used to provide a touch interface for finger touch operations to reflect and form a fingerprint.
  • Detecting light the above-mentioned image side can be an image sensor in an optical fingerprint identification device, which can be used to receive fingerprint detection light and generate fingerprint data for fingerprint identification.
  • the reflective component may include one or more mirrors.
  • the reflective component is used to reflect the fingerprint detection light passing through the backlight module and change the propagation direction of the fingerprint detection light.
  • the reflective component can "fold the optical path of the fingerprint detection light" ", so as to reduce the distance between the liquid crystal display 10 and the fingerprint identification module 60, and avoid the excessive thickness of the electronic device due to the excessive distance between the liquid crystal display 10 and the fingerprint identification module 60.
  • the reflective assembly may also include a bracket for supporting one or more of the above-mentioned reflective mirrors.
  • the lens group includes a plurality of lenses arranged in sequence from the object side to the image side.
  • it may include three lenses.
  • the lens group including the three lenses has a large focal length, increases the magnification, and can better distinguish fingerprint images.
  • it includes a first lens 31, a second lens 32, and a third lens 33 in sequence.
  • the fingerprint detection light is reflected by the reflective component to form reflected light.
  • the first lens 31, the second lens 32, and the third lens 33 are used to generate the reflected light. Refraction, so as to converge on the optical fingerprint sensor chip to realize fingerprint recognition.
  • the first lens 31, the second lens 32, and the third lens 33 may be injection molded using a resin material.
  • the lens assembly satisfies that: among the above-mentioned six mirror surfaces, at least one mirror surface is an aspherical mirror surface.
  • any one or any number of the six mirror surfaces can be set as aspherical mirror surfaces; it is also possible to set all the six mirror surfaces as aspherical mirror surfaces; or each lens can be set to include at least one aspherical mirror surface
  • the setting of the mirror surface in this embodiment is not limited to this.
  • the lens group of the embodiment of the present application adopts three lenses with at least one aspherical mirror surface.
  • the fingerprint detection area is at least partially located in the display area of the liquid crystal display 10, and a finger touching the fingerprint detection area forms a fingerprint detection light carrying fingerprint information of the finger.
  • the liquid crystal display 10 includes a display module and a backlight module.
  • the display module is provided with a fingerprint detection area for the user to place a finger for fingerprint input. At least part of the fingerprint detection area is located in the display area of the liquid crystal display panel. , It can also be completely located in the display area of the liquid crystal display panel.
  • the backlight module is arranged under the display module, and the fingerprint recognition module 60 is located under the backlight module.
  • the fingerprint recognition module 60 may include an optical fingerprint sensor chip and a light source.
  • the backlight module includes a light source that allows light from the light source to pass through.
  • the transparent part of the fingerprint detection area through the backlight module is used to allow the light emitted by the light source to pass through the backlight module and be emitted to the fingerprint detection area, so that the finger above the fingerprint detection area can be reflected/scattered or transmitted
  • the fingerprint detection light carrying fingerprint information is formed, and the fingerprint detection light formed on the finger passing through the display module is allowed to enter the optical fingerprint sensor chip through the backlight module.
  • the lens group in this embodiment satisfies: 0 ⁇
  • TTL Total Trace Length
  • the lens group satisfies: -2 ⁇ f1/R1 ⁇ 50, f1 is the focal length of the first lens 31; R1 is the radius of curvature of the first lens 31 close to the object side.
  • the lens group satisfies: 0 ⁇ f1/R2 ⁇ 10, and R2 is the radius of curvature of the first lens 31 close to the image side.
  • R2 is the radius of curvature of the first lens 31 close to the image side.
  • the lens group satisfies: -5 ⁇ f2/R3 ⁇ 8, f2 is the focal length of the second lens 32; R3 is the radius of curvature of the second lens 32 close to the object side.
  • the lens group satisfies: 0 ⁇ f2/R4 ⁇ 10, and R4 is the radius of curvature of the second lens 32 close to the image side.
  • R4 is the radius of curvature of the second lens 32 close to the image side.
  • the lens group satisfies: -240 ⁇ f3/R5 ⁇ 0, f3 is the focal length of the third lens 33; R5 is the radius of curvature of the third lens 33 close to the object side.
  • f3 is the focal length of the third lens 33
  • R5 is the radius of curvature of the third lens 33 close to the object side.
  • the lens group satisfies: 0 ⁇ f3/R6 ⁇ 210, and R6 is the radius of curvature of the third lens 33 close to the image side.
  • R6 is the radius of curvature of the third lens 33 close to the image side.
  • the lens group satisfies: 0 ⁇ CT1/CT2 ⁇ 2, CT1 is the central thickness of the first lens 31; CT2 is the central thickness of the second lens 32.
  • the lens group satisfies: 0 ⁇ CT2/CT3 ⁇ 3, and CT3 is the central thickness of the third lens 33.
  • Such an arrangement can make the lens group and the optical fingerprint identification device stronger, and prolong the service life of the lens group and the optical fingerprint identification device.
  • the lens group satisfies: the refractive index n1 of the first lens 31>1.50, and the dispersion coefficient v1>20.0 of the first lens 31.
  • the dispersion of the first lens 31 is reduced, the production cost is reduced, and an appropriate aberration balance is provided.
  • the lens group satisfies: the refractive index of the second lens 32 is n2>1.50, and the dispersion coefficient of the second lens 32 is v2>20.0.
  • the dispersion of the second lens 32 is reduced, the production cost is reduced, and a proper aberration balance is provided.
  • the lens group satisfies: the refractive index of the third lens 33 is n3>1.50, and the dispersion coefficient of the third lens 33 is v3>20.0.
  • the dispersion of the third lens 33 is reduced, the production cost is reduced, and a proper aberration balance is provided.
  • the lens group satisfies: in the field of view with FOV ⁇ 120°, the distortion is less than 5%.
  • FOV Field of view
  • the FOV (Field of view) of the lens group is less than 120°, which can receive the reflected light of a specific angle formed by the reflection of the reflective component; the TV distortion of the lens group can be controlled within 5% to realize the fingerprint image
  • the true restoration of optical fingerprints improves the accuracy of optical fingerprint recognition; in addition, the working F number of the lens group is less than 2.0, which is used to detect weak fingerprint signals and shorten the exposure time.
  • the reflective component includes a reflective mirror 21, the reflective mirror 21 includes a reflective surface, and the angle between the reflective surface and the liquid crystal display screen 10 is an acute angle.
  • the reflective component may include a reflector 21 and a bracket for supporting the reflector 21.
  • the reflector can reflect infrared light and can reflect fingerprint detection light
  • the reflector 21 includes a reflector for reflecting fingerprint detection light.
  • the reflective surface, and the angle between the reflective surface and the liquid crystal display 10 is an acute angle, to receive and reflect the fingerprint detection light passing through the liquid crystal display 10, thereby changing the propagation route of the fingerprint detection light.
  • Such an arrangement reduces the size of the liquid crystal display.
  • the distance between the screen 10 and the optical fingerprint sensor chip are examples of the distance between the screen 10 and the optical fingerprint sensor chip.
  • the reflection mirror 21 may be specifically configured as a total reflection mirror.
  • the reflector 21 can "fold" the fingerprint detection light, thereby reducing the distance between the liquid crystal display 10 and the fingerprint recognition module 60, that is, reducing the thickness of the optical fingerprint recognition device, and avoiding the liquid crystal The distance between the display screen 10 and the fingerprint identification module 60 is too large, resulting in an excessive thickness of the electronic device.
  • the fingerprint identification module 60 includes an optical fingerprint sensor chip, and the reflected light is irradiated to the light receiving surface of the optical fingerprint sensor chip, and the light receiving surface of the optical fingerprint sensor chip is perpendicular to the liquid crystal display 10 set up.
  • the fingerprint detection light is reflected by the reflector to form reflected light.
  • the reflected light can be parallel to the liquid crystal display 10.
  • the reflected light is converged by the lens group and then covered on the light receiving surface of the optical fingerprint sensor chip.
  • the light receiving surface is connected to the light receiving surface of the optical fingerprint sensor chip.
  • the liquid crystal display 10 is arranged vertically to receive the concentrated reflected light.
  • the reflective component includes a first reflective mirror 22 and a second reflective mirror 23, the first reflective mirror 22 includes a first reflective surface, and the second reflective mirror 23 includes a second reflective surface, and the first reflective surface is opposite to the second reflective surface.
  • Parallel, the angle between the first reflecting surface and the liquid crystal display 10 is an acute angle, the fingerprint detection light passes through the first reflecting surface to form first reflected light, and the first reflected light passes through the second reflecting surface to form second reflected light.
  • the reflecting assembly may include two reflecting mirrors and a bracket for supporting the above-mentioned two reflecting mirrors.
  • the two reflecting mirrors are a first reflecting mirror 22 and a second reflecting mirror 23, respectively.
  • the first reflecting mirror 22 includes a support for reflecting The first reflective surface of the fingerprint detection light, and the angle between the reflective surface and the liquid crystal display 10 is an acute angle, to receive and reflect the fingerprint detection light passing through the liquid crystal display 10, and the fingerprint detection light is reflected by the first mirror 22
  • the first reflected light is formed;
  • the second reflecting mirror 23 includes a second reflecting light for reflecting the above-mentioned first reflected light.
  • the first reflected light is reflected by the second reflecting mirror 23 to form a second reflected light, and the second reflected light passes through the optical path of the lens group.
  • the first reflector 22 and the second reflector 23 "fold" the fingerprint detection light, thereby reducing the distance between the liquid crystal display 10 and the fingerprint identification module 60, and avoiding damage to the liquid crystal display
  • the distance between 10 and the fingerprint identification module 60 is too large, resulting in an excessive thickness of the electronic device.
  • the fingerprint identification module 60 includes an optical fingerprint sensor chip, and the reflected light is irradiated to the light receiving surface of the optical fingerprint sensor chip, and the light receiving surface of the optical fingerprint sensor chip is parallel to the liquid crystal display 10 set up.
  • the fingerprint detection light is reflected twice by the first reflector 22 and the second reflector 23 to form a second reflected light.
  • the second reflected light can be perpendicular to the liquid crystal display 10, and the second reflected light is condensed by the lens group and irradiated to the optics.
  • the light receiving surface is arranged in parallel with the liquid crystal display 10 for receiving the second reflected light after convergence.
  • the optical fingerprint sensor chip is used to be carried on the flexible circuit board and electrically connected to the flexible circuit board, and the optical fingerprint sensor chip includes an optical sensing array with a plurality of optical sensing units.
  • the optical fingerprint sensor chip can be carried on a flexible circuit board, and is electrically connected to the flexible circuit board through metal leads.
  • the optical fingerprint sensor chip may specifically include an optical sensing array with a plurality of optical sensing units.
  • the light path guide component arranged under the backlight module is used to guide the fingerprint detection light to the optical sensor array.
  • the fingerprint recognition module 60 may also include a filter to filter out ambient light or other interference light entering the optical sensor array.
  • the filter may allow the infrared light signal corresponding to the fingerprint detection light to pass through. And filter out the optical signals of other bands.
  • the optical path guide assembly further includes a lens barrel or lens holder for carrying the lens group.
  • the lens barrel or lens holder is arranged above the flexible circuit board and forms a closed space with the flexible circuit board, and the optical sensor array is arranged in a closed space.
  • the lens group is used to guide or converge the reflected light to the optical sensing array to realize the optical fingerprint imaging of the finger on the optical sensing array.
  • the fingerprint identification module 60 further includes a filter 50 for filtering interference light, and the filter 50 is arranged on the side of the optical fingerprint sensor chip facing the lens group.
  • the filter 50 can be formed on the optical sensor array of the optical fingerprint sensor chip by coating to prevent interference light from entering the optical sensor array; the filter 50 can also be arranged on the optical fingerprint sensor chip by pasting.
  • the filter 50 is adhered to the optical fingerprint sensor chip through a filter bonding glue.
  • the optical path guide assembly further includes an aperture 40 which is arranged between the reflection assembly and the lens group, or between the first lens 31 and the second lens 32.
  • the diaphragm 40 is used to adjust the amount of light passing through the lens group.
  • the fingerprint identification module 60 provided by the embodiment of the present application will be described in detail below in conjunction with four specific embodiments.
  • FIG. 2 is a schematic diagram of the optical fingerprint identification device provided in the first embodiment of the application installed in the liquid crystal display 10;
  • FIG. 3 is the astigmatism and distortion collection curve of the lens group in the first embodiment of the application;
  • the maximum field of view is 6.500 mm, and the legend corresponds to the wavelength.
  • Fig. 4 is a curve of the imaging quality of the lens group in the first embodiment of the application, and the legend corresponds to the position of the field of view.
  • the optical fingerprint recognition device is arranged under the liquid crystal display 10, the optical fingerprint recognition device includes a light path guide component, a filter 50 and a fingerprint recognition module 60, wherein the light path guide component is sequentially from the object side to the image side It includes a mirror 21, a diaphragm 40, a first lens 31, a second lens 32, and a third lens 33.
  • the first lens 31 is a lens with positive power
  • the second lens 32 is a lens with positive power
  • the third lens 33 is Negative power lens.
  • the overall focal length of the lens group composed of the first lens 31, the second lens 32, and the third lens 33 is f
  • the aperture value of the lens group is Fno (f-number)
  • the maximum field angle of the lens group is FOV
  • the maximum field angle of the lens group is FNO (f-number).
  • the distortion at the field becomes Dis (Distortion)
  • the distance from the lower surface of the liquid crystal display screen 10 along the optical axis to the distal edge of the reflective surface of the mirror 21 is TTL.
  • the upper and lower surfaces of the LCD screen 10 are S1, S2, the reflecting surface of the mirror 21 is S3, the surface of the diaphragm 40 is S4, and the two surfaces of the first lens 31 are S5 and S6, respectively.
  • the two sides of the second lens 32 are S7 and S8, the two sides of the third lens 33 are S9, S10, the two sides of the filter 50 are S11, S12, and the two sides of the filter glue are S13 and S14, respectively.
  • the surface is S15.
  • the image surface S15 refers to the imaged surface on the fingerprint recognition module.
  • S13 is attached to the surface of the filter S12
  • S14 is attached to the image surface.
  • S15 means that the surface of the fingerprint recognition module is attached.
  • the shapes and parameters of S12 and S13 are the same, and the shapes and parameters of S14 and S15 are the same. Specifically, the lens parameters of the lens group satisfy Table 1, Table 2, and Table 3.
  • the reflective assembly includes a reflector 21.
  • the fingerprint detection light passing through the liquid crystal display 10 is reflected by the reflector 21 to form reflected light.
  • the reflector 21 "folds" the propagation path of the fingerprint detection light, thereby
  • the distance between the LCD screen 10 and the fingerprint identification module 60 is reduced, that is, the thickness of the optical fingerprint identification device is reduced; the reflected light continues to propagate, passing through the first lens 31, the second lens 32, and the third lens in turn.
  • the lens 33 converges to the fingerprint identification module 60 to form a large and clear "four-lobe" optical fingerprint image, which facilitates the extraction and identification of one or more fingerprint images, and improves the fingerprint identification effect.
  • the larger the focal length the larger the "petal" of the image obtained, which is beneficial to increase the area of the effective recognition area, thereby improving the accuracy of fingerprint recognition.
  • A2, A4, A6, A8, A10, A12, A14, and A16 in Table 3 represent the coefficients of the aspherical higher-order terms of the aspheric lens, and the coefficients of A2 are all 0, which is not reflected in the table.
  • FIG. 5 is a schematic diagram of the optical fingerprint identification device provided in the second embodiment of the application installed in the liquid crystal display 10;
  • FIG. 6 is the astigmatism and distortion collection curve of the lens group in the second embodiment of the application;
  • the maximum field of view is 6.000 mm, and the legend corresponds to the wavelength.
  • FIG. 7 is a curve of imaging quality of the lens group in the second embodiment of the application, and the legend corresponds to the position of the field of view.
  • the optical fingerprint recognition device is arranged under the liquid crystal display 10, the optical fingerprint recognition device includes a light path guide component, a filter 50 and a fingerprint recognition module 60, wherein the light path guide component is sequentially from the object side to the image side It includes a mirror 21, a first lens 31, a diaphragm 40, a second lens 32, and a third lens 33.
  • the first lens 31 is a lens with negative refractive power
  • the second lens 32 is a positive refractive lens
  • the third lens 33 It is a negative power lens.
  • the reflector 21 is set as a total reflection lens, which includes a light entrance surface, a light exit surface, and a reflective surface.
  • the light entrance surface is parallel to the liquid crystal display 10
  • the light exit surface is perpendicular to the liquid crystal display 10
  • the reflective surface is parallel to the liquid crystal display.
  • An acute angle is formed between the display screens 10.
  • the overall focal length of the lens group composed of the first lens 31, the second lens 32 and the third lens 33 is f
  • the aperture value of the lens group is Fno (f-number)
  • the maximum field angle of the lens group is FOV (Field of view)
  • the distortion at the maximum field of view becomes Dis (Distortion)
  • TTL the distance from the lower surface of the liquid crystal display screen 10 along the optical axis to the distal edge of the reflective surface of the mirror 21.
  • the upper and lower surfaces of the LCD screen 10 are respectively S1 and S2, the incident surface of the mirror 21 is S3, the reflecting surface is S4, and the exit surface is S5.
  • the two surfaces of the first lens 31 are respectively S6 and S7.
  • the surface of the diaphragm 40 is S8, the two sides of the second lens 32 are S9 and S10, the two sides of the third lens 33 are S11, S12, and the two sides of the filter 50 are S13 and S14.
  • the filters are attached
  • the two sides of the glue are S15 and S16 respectively, and the image plane is S17. It should be noted that the image plane S17 refers to the imaged surface on the fingerprint recognition module.
  • the lens parameters of the lens group satisfy Table 4, Table 5, and Table 6.
  • the reflective assembly includes a reflective mirror 21, and in this embodiment, the reflective mirror 21 is set as a total reflection lens, which further enhances the reflection effect; the fingerprint detection light passing through the liquid crystal display screen 10 passes through the reflective mirror 21 The reflection forms the reflected light, and the reflecting mirror 21 "folds" the propagation path of the fingerprint detection light, which can effectively increase the object distance of the optical fingerprint identification device, so that a large focal length lens can be used to realize fingerprint detection or identification under the screen.
  • the distance between the liquid crystal display 10 and the fingerprint identification module 60 is further reduced, that is, the thickness of the optical fingerprint identification device is reduced; the reflected light continues to propagate and passes through the first lens 31, the second lens 32, and The third lens 33 converges to the fingerprint identification module 60 to form a large and clear "four-lobe" optical fingerprint image, which facilitates the extraction and recognition of one or more fingerprint images, and improves the fingerprint recognition effect .
  • the larger the focal length, the larger the magnification, and the larger the "petals" of the obtained image which is beneficial to increase the area of the effective recognition area, thereby improving the accuracy of fingerprint recognition.
  • A2 A4, A6, A8, A10, A12, A14, and A16 represent the coefficients of the aspherical higher-order terms of the aspheric lens, and the coefficients of A2 are all 0, which is not shown in the table.
  • FIG. 8 is a schematic diagram of the optical fingerprint identification device provided in the second embodiment of the application installed in the liquid crystal display 10;
  • FIG. 9 is the astigmatism and distortion collection curve of the lens group in the third embodiment of the application;
  • the maximum field of view is 6.700 mm, and the legend corresponds to the wavelength.
  • FIG. 10 is a curve of the imaging quality of the lens group in the third embodiment of the application, and the legend corresponds to the position of the field of view.
  • the optical fingerprint recognition device is arranged under the liquid crystal display 10, the optical fingerprint recognition device includes a light path guide component, a filter 50 and a fingerprint recognition module 60, wherein the light path guide component is sequentially from the object side to the image side It includes a mirror 21, a diaphragm 40, a first lens 31, a second lens 32, and a third lens 33.
  • the first lens 31 is a lens with negative refractive power
  • the second lens 32 is a positive refractive lens
  • the third lens 33 It is a negative power lens.
  • the overall focal length of the lens group composed of the first lens 31, the second lens 32 and the third lens 33 is f
  • the aperture value of the lens group is Fno (f-number)
  • the maximum field angle of the lens group is FOV (Field of view)
  • the distortion at the maximum field of view becomes Dis (Distortion)
  • TTL the distance from the lower surface of the liquid crystal display screen 10 along the optical axis to the distal edge of the reflective surface of the mirror 21.
  • the upper and lower surfaces of the LCD screen 10 are S1, S2, the reflecting surface of the mirror 21 is S3, the surface of the diaphragm 40 is S4, and the two surfaces of the first lens 31 are S5 and S6, respectively.
  • the two sides of the second lens 32 are S7 and S8, the two sides of the third lens 33 are S9 and S10, the two sides of the filter 50 are S11, S12, and the image plane is S13.
  • the image plane S13 refers to It is the imaged surface on the fingerprint recognition module.
  • the lens parameters of the lens group satisfy Table 7, Table 8, and Table 9.
  • the reflective assembly includes a reflector 21.
  • the fingerprint detection light passing through the liquid crystal display 10 is reflected by the reflector 21 to form reflected light.
  • the reflector 21 "folds" the propagation path of the fingerprint detection light, thereby
  • the distance between the LCD screen 10 and the fingerprint identification module 60 is reduced, that is, the thickness of the optical fingerprint identification device is reduced; the reflected light continues to propagate, passing through the first lens 31, the second lens 32, and the third lens in turn.
  • the lens 33 converges to the fingerprint identification module 60 to form a large and clear "four-lobe" optical fingerprint image, which facilitates the extraction and identification of one or more fingerprint images, and improves the fingerprint identification effect.
  • the larger the focal length, the larger the magnification, and the larger the "petals" of the obtained image which is beneficial to increase the area of the effective recognition area, thereby improving the accuracy of fingerprint recognition.
  • A2 A4, A6, A8, A10, A12, A14, and A16 represent the coefficients of the aspheric surface of the aspheric lens. Among them, the coefficients of A2 are all 0, which is not shown in the table.
  • FIG. 11 is a schematic diagram of the optical fingerprint identification device provided in the fourth embodiment of the application installed in the liquid crystal display 10;
  • FIG. 12 is the astigmatism and distortion collection curve of the lens group in the fourth embodiment of the application;
  • the maximum field of view is 5.700 mm, and the legend corresponds to the wavelength.
  • FIG. 13 is a curve of the imaging quality of the lens group in Embodiment 4 of the application, and the legend corresponds to the position of the field of view.
  • the optical fingerprint recognition device is arranged under the liquid crystal display 10, the optical fingerprint recognition device includes a light path guide component, a filter 50 and a fingerprint recognition module 60, wherein the light path guide component is sequentially from the object side to the image side It includes a first reflector 22, a second reflector 23, a diaphragm 40, a first lens 31, a second lens 32, and a third lens 33.
  • the first lens 31 is a lens with positive refractive power
  • the second lens 32 has a positive refractive power.
  • the third lens 33 is a negative power lens.
  • the first reflecting mirror 22 is parallel to the second reflecting mirror 23, and an acute angle is formed between the first reflecting mirror 22 and the liquid crystal display screen 10.
  • the fingerprint detection light passing through the liquid crystal display screen 10 is reflected by the first reflecting mirror 22 to form a first Reflected light
  • the first reflected light is reflected by the second reflector 23 to form a second reflected light
  • the second reflected light enters the optical path of the lens group composed of the first lens 31, the second lens 32, and the third lens 33.
  • the overall focal length of the lens group composed of the first lens 31, the second lens 32 and the third lens 33 is f
  • the aperture value of the lens group is Fno (f-number)
  • the maximum field angle of the lens group is FOV (Field of view)
  • the distortion at the maximum field of view becomes Dis (Distortion)
  • TTL the distance from the lower surface of the liquid crystal display screen 10 along the optical axis to the distal edge of the reflecting surface of the mirror.
  • the upper and lower surfaces of the liquid crystal display screen 10 are respectively S1 and S2, the reflective surface of the first mirror 22 is S3, the reflective surface of the second mirror 23 is S4, and the surface of the diaphragm 40 is S5.
  • the two sides of the first lens 31 are respectively S6 and S7, the two sides of the second lens 32 are respectively S8 and S9, the two sides of the third lens 33 are respectively S10 and S11, and the two sides of the filter 50 are respectively S12 and S13.
  • the image surface S15 refers to the imaged surface on the fingerprint recognition module.
  • the lens parameters of the lens group satisfy Table 10, Table 11, and Table 12.
  • the reflective assembly includes a first reflective mirror 22 and a second reflective mirror 23.
  • the fingerprint detection light passing through the liquid crystal display screen 10 is sequentially reflected by the first reflective mirror 22 and the second reflective mirror 23 to form reflected light.
  • the first reflector 22 and the second reflector 23 "fold" the propagation path of the fingerprint detection light, thereby reducing the distance between the liquid crystal display 10 and the fingerprint identification module 60, that is, reducing the optical fingerprint
  • the thickness of the identification device; the reflected light continues to propagate, passes through the first lens 31, the second lens 32, and the third lens 33 in turn, and then converges to the fingerprint identification module 60, forming a large, clear "quadruple" optical fingerprint Image, which facilitates the extraction and recognition of one or more fingerprint images, and improves the fingerprint recognition effect.
  • the larger the focal length, the larger the magnification, and the larger the "petals" of the obtained image which is beneficial to increase the area of the effective recognition area, thereby improving the accuracy of fingerprint recognition.
  • A2 A4, A6, A8, A10, A12, A14, and A16 represent the coefficients of the aspheric surface of the aspheric lens. Among them, the coefficients of A2 are all 0, which is not shown in the table.
  • the fifth embodiment of the present application provides an electronic device, including a liquid crystal display 10 and the optical fingerprint identification device provided in the first, second, third or fourth embodiment.
  • the optical fingerprint identification device is provided on the liquid crystal display 10. Under the backlight module to achieve under-screen optical fingerprint detection.
  • the electronic device may be an electronic device with a liquid crystal display 10 such as a mobile phone or a tablet computer.
  • the liquid crystal display 10 may also include a display module and a backlight module.
  • a display module and a backlight module.
  • the structure and function of the optical fingerprint identification device are the same as those of the above-mentioned embodiment, and will not be repeated here.
  • the light source can emit infrared detection light for fingerprint detection.
  • the infrared detection light passes through the liquid crystal display 10 and enters the finger, and passes through the surface of the finger after being transmitted or scattered by the finger.
  • the fingerprint detection light carrying fingerprint information is formed.
  • the fingerprint detection light returns from the liquid crystal display 10 and is reflected by the reflective component to form reflected light.
  • the reflected light is converged or guided by the lens group and then further transmitted to the fingerprint identification module 60, fingerprint identification
  • the module 60 receives the above reflected light to obtain the fingerprint image or fingerprint information of the finger.
  • the reflective component can change the propagation direction of the fingerprint detection light, reduce the distance between the fingerprint identification module 60 and the liquid crystal display 10, avoid excessive thickness, and meet the increasingly tight size restrictions of electronic devices;
  • the lens group converges the reflected light to the fingerprint recognition module 60, can effectively collect signal light at a specific angle, increases the recognition field of view, meets the requirement of fingerprint recognition for the field of view, and ensures the realization of the optical fingerprint recognition function.
  • a person of ordinary skill in the art can understand that all or part of the steps in the foregoing method embodiments can be implemented by a program instructing relevant hardware.
  • the aforementioned program can be stored in a computer readable storage medium. When the program is executed, it executes the steps including the foregoing method embodiments; and the foregoing storage medium includes: ROM, RAM, magnetic disk, or optical disk and other media that can store program codes.

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  • Optics & Photonics (AREA)
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Abstract

La présente invention se rapporte au domaine technique de la reconnaissance biométrique. L'invention concerne un dispositif de reconnaissance d'empreintes digitales et un appareil électronique. Le dispositif de reconnaissance d'empreintes digitales comporte un module (60) de reconnaissance d'empreintes digitales et un ensemble de guidage de chemin optique. L'ensemble de guidage de chemin optique comporte un ensemble de réflexion et un ensemble de lentilles disposés séquentiellement du côté objet au côté image. L'ensemble de réflexion réfléchit une lumière de détection d'empreintes digitales pour former une lumière réfléchie. L'ensemble de lentilles fait converger la lumière réfléchie sur le module (60) de reconnaissance d'empreintes digitales. L'ensemble de réflexion comporte au moins un réflecteur (21). L'ensemble de lentilles comporte une première lentille (31), une deuxième lentille (32) et une troisième lentille (33) qui partagent le même axe optique. Au moins une des lentilles est une lentille asphérique. Dans le dispositif de reconnaissance d'empreintes digitales, l'ensemble de réflexion peut changer une direction de propagation de la lumière de détection d'empreintes digitales, réduisant ainsi une distance entre le module (60) de reconnaissance d'empreintes digitales et un écran (10) d'affichage à cristaux liquides. L'ensemble de lentilles fait converger la lumière réfléchie sur le module (60) de reconnaissance d'empreintes digitales, de telle façon qu'une lumière de signal provenant de certains angles puisse être recueillie, accroissant ainsi une aire efficace d'imagerie d'empreintes digitales, et améliorant le rendement de la reconnaissance optique d'empreintes digitales.
PCT/CN2020/073861 2020-01-22 2020-01-22 Dispositif de reconnaissance d'empreintes digitales et appareil électronique WO2021147012A1 (fr)

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