WO2021036326A1 - Module de détection d'empreintes digitales et dispositif électronique - Google Patents

Module de détection d'empreintes digitales et dispositif électronique Download PDF

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Publication number
WO2021036326A1
WO2021036326A1 PCT/CN2020/088377 CN2020088377W WO2021036326A1 WO 2021036326 A1 WO2021036326 A1 WO 2021036326A1 CN 2020088377 W CN2020088377 W CN 2020088377W WO 2021036326 A1 WO2021036326 A1 WO 2021036326A1
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WO
WIPO (PCT)
Prior art keywords
display panel
image sensor
lens
module
array
Prior art date
Application number
PCT/CN2020/088377
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English (en)
Chinese (zh)
Inventor
叶肇懿
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神盾股份有限公司
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 神盾股份有限公司 filed Critical 神盾股份有限公司
Publication of WO2021036326A1 publication Critical patent/WO2021036326A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • the invention relates to a fingerprint sensing module and an electronic device.
  • the under-screen fingerprint sensor module can be divided into an ultrasonic fingerprint sensor module and an optical fingerprint sensor module.
  • the optical fingerprint sensor module is more mass-produced and lower in cost.
  • the traditional optical fingerprint sensor module uses multiple lenses arranged on the optical axis to image the fingerprint image on the display panel on the image sensor below the display panel.
  • it has the disadvantage that the sensor module is too thick, making it possible to The thickness of the portable electronic device has been reduced.
  • the multiple lenses not only image the fingerprint on the display panel on the image sensor, but also image the electrode structure in the display panel on the image sensor, resulting in the image sensor sensed by the image sensor.
  • the fingerprint image has moire, which reduces the success rate and accuracy of fingerprint recognition.
  • the present invention is directed to a fingerprint sensing module, which can effectively overcome the problem of net interference.
  • the present invention is directed to an electronic device whose fingerprint sensing module can achieve a high fingerprint recognition success rate and accuracy rate.
  • An embodiment of the present invention provides a fingerprint sensing module, which is suitable for being disposed under a display panel and includes an image sensor and a lens module.
  • the image sensor is arranged under the display panel, and the lens module is arranged between the image sensor and the display panel.
  • the display panel has an upper surface contacted by a user's finger, a lower surface facing the image sensor, and an electrode structure located between the upper surface and the lower surface.
  • the mirror module images the fingerprint of the finger touching the upper surface on the image sensor, the lens module forms a virtual image of the electrode structure, and the electrode structure is located between the virtual image and the image sensor.
  • An embodiment of the present invention provides an electronic device including a display panel and the aforementioned fingerprint sensing module, wherein the fingerprint sensing module is disposed under the display panel.
  • the mirror module images the fingerprint of the finger touching the upper surface on the image sensor
  • the lens module forms a virtual image of the electrode structure
  • the electrode is located between the virtual image and the image sensor. Therefore, fingerprints can be clearly imaged on the image sensor, but the electrode structure of the display panel cannot be imaged on the image sensor. In this way, the image sensor can sense a clear fingerprint image without being affected by the interference of the mesh, thereby enabling the fingerprint sensing module to achieve a higher fingerprint recognition success rate and accuracy rate.
  • FIG. 1 is a schematic partial cross-sectional view of an electronic device according to an embodiment of the invention.
  • Fig. 2A is a light trace diagram of light from the electrode structure in Fig. 1 transmitted to the image sensor;
  • FIG. 2B shows a virtual image of the electrode structure in FIG. 2A
  • 2C is a graph of the diffraction modulation transfer function of the image formed by the electrode structure in FIG. 2A on the image sensor;
  • 3A is a light trace diagram of light reflected by a finger pressed on the upper surface of the display panel in FIG. 1 transmitted to the image sensor;
  • 3B is a graph of the diffraction modulation transfer function of the image formed by the finger on the image sensor in FIG. 3A.
  • FIG. 1 is a schematic partial cross-sectional view of an electronic device according to an embodiment of the invention.
  • the electronic device 100 of this embodiment includes a display panel 110 and a fingerprint sensing module 200, wherein the fingerprint sensing module 200 is disposed under the display panel 110.
  • the display panel 110 is a transparent display panel, such as an organic light-emitting diode (OLED) display panel.
  • OLED organic light-emitting diode
  • the display panel 110 may also be a liquid crystal display panel.
  • the fingerprint sensing module 200 includes an image sensor 210 and a lens module 220.
  • the image sensor 210 is disposed under the display panel 110, and the lens module 220 is disposed between the image sensor 210 and the display panel 110.
  • the display panel 110 has an upper surface S1 contacted by the user's finger 50, a lower surface S3 facing the image sensor 210, and an electrode structure 116 located between the upper surface S1 and the lower surface S3.
  • the electrode structure 116 includes an opaque electrode existing in the pixel structure of the display panel 110.
  • the light 111 emitted by the pixels of the display panel 110 is transmitted upward and irradiated on the finger 50 contacting the upper surface S1.
  • the finger 50 then reflects the light 111, and the light 111 reflected by the finger 50 carries the information of the fingerprint 52 of the finger 50 and sequentially penetrates the display panel 110 and the lens module 220 to be transmitted to the image sensor 210 to be on the image sensor 210 An image of the fingerprint 52 is formed.
  • the mirror module images the fingerprint 52 of the finger 50 contacting the upper surface S1 on the image sensor 210.
  • the lens module 220 forms a virtual image 117 of the electrode structure 116, and the electrode structure 116 is located between the virtual image 117 and the image sensor 210.
  • the lens module 220 does not image the electrode structure 116 on the image sensor 210, and the fingerprint 52 can be clearly imaged on the image sensor 210.
  • the image sensor 210 can sense a clear fingerprint image without being affected by the interference of the mesh, so that the electronic device 100 and the fingerprint sensor module 200 can achieve a higher fingerprint recognition success rate and accuracy rate. .
  • the image sensor 210 is, for example, a complementary metal oxide semiconductor (CMOS) image sensor, a charge coupled device (CCD), a thin film transistor (thin film transistor) image sensor, or other suitable image sensors.
  • CMOS complementary metal oxide semiconductor
  • CCD charge coupled device
  • thin film transistor thin film transistor
  • the lens module 220 is a micro-lens array, which has a plurality of micro-lens 222 arranged in an array (for example, a two-dimensional array).
  • Each microlens 222 is a convex lens, such as a biconvex lens (biconvex lens).
  • the microlens 222 may also be other types of convex lenses, such as a meniscus lens or a plano-convex lens.
  • the electrode structure 116 is located between the principal point P1 of each microlens 222 close to the display panel 110 and the focal point F1 close to the display panel 110, and each microlens 222 is close to the display panel 110
  • the focal point F1 is located between the upper surface S1 and the microlens 222, so that the fingerprint 52 of the finger contacting the upper surface S1 can be clearly imaged on the image sensor 210, but the electrode structure 116 is not imaged on the image sensor 210. effect.
  • each microlens 222 has two focal points, one of which is on the side close to the display panel 110, and the other is on the side close to the image sensor 210, and the aforementioned focal point F1 refers to the one close to the display panel 110. Focus on the side.
  • each microlens 222 has two principal points, one of which is closer to the display panel 110 and the other is closer to the image sensor 210, and the principal point P1 mentioned above refers to the principal point closer to the display panel 110.
  • the fingerprint sensor module 200 further includes an aperture stop 230, which is disposed between the microlens array (that is, the lens module 220) and the image sensor 210, and the aperture stop 230 has respective correspondences.
  • a plurality of openings 232 to these microlenses 222, and the light 111 from these microlenses 222 is respectively transmitted to the image sensor 210 through these openings 232.
  • the aperture stop 230 can limit the incident light angle, thereby improving the imaging quality of the fingerprint 52 and suppressing crosstalk.
  • optical parameter table of the electronic device 100 of an embodiment The following lists an optical parameter table of the electronic device 100 of an embodiment:
  • surface S2 is the lower surface of the electrode structure (that is, the surface facing the image sensor 210)
  • surface S4 is the upper surface of the microlens 222 (that is, the surface facing the display panel 110)
  • surface S5 is the lower surface of the microlens 222 (That is, the surface facing the image sensor 210)
  • the surface S6 is the lower surface of the aperture stop 230 (that is, the surface facing the image sensor 110)
  • the sensing surface S7 is the sensing surface of the image sensor 110.
  • the row spacing of the surface S1 of the display panel 200 of 1.25 mm means that the distance from the surface S1 to the next surface (ie, the surface S2) is 1.25 mm.
  • the distance between the lower surface S3 and the column of 0.05 mm means that the distance from the lower surface S3 to the next surface (ie, the surface S4) on the optical axis A of the microlens 222 is 0.05 mm.
  • the rest of the spacing is defined by analogy.
  • the aperture stop 230 is a light-shielding film formed on the micro lens array (ie, the lens module 220).
  • both the surface S4 and the surface S5 are aspherical surfaces.
  • both the surface S4 and the surface S5 are convex surfaces.
  • the aspheric surfaces of the surface S4 and the surface S5 can be defined by the following formula:
  • R is the radius of curvature of the surface S4 (or surface S5) of the microlens 222 near the optical axis A;
  • Z is the depth of the aspheric surface (the point on the aspheric surface that is Y from the optical axis A, and the tangent plane to the vertex on the aspheric optical axis A, the vertical distance between the two);
  • Y is the distance between the point on the aspherical curve and the optical axis A;
  • K is the conic constant
  • the taper coefficient K of the surface S4 is 0.9194
  • the taper coefficient K of the surface S5 is -100
  • the R value of the surface S4 in the above formula is 0.1647 mm
  • FIG. 2A is a light trace diagram of the light from the electrode structure in FIG. 1 transmitted to the image sensor
  • FIG. 2B shows a virtual image of the electrode structure in FIG. 2A
  • FIG. 2C is the formation of the electrode structure in FIG. 2A on the image sensor A graph of the diffraction modulation transfer function of the image.
  • FIGS. 2A to 2C It can be clearly seen from FIG. 2A that the light 113 from the electrode structure 116 cannot be imaged on the sensing surface S7 of the image sensor 210, while it can be seen from FIG. 2B that the light 113 traces inversely.
  • the intersection point of 115 can obtain the position of the virtual image 117 of the surface S2 where the electrode structure 116 is located.
  • the distance D3 between the virtual image 117 and the surface S7 of the aperture stop 230 is 2.5 mm.
  • the modulus of the modulation transfer function MTF
  • the modulus of the modulation transfer function represents the comparison of images.
  • the curve labeled F0 in Figure 2C represents the diffraction limit
  • the curve labeled F1 represents the modulation transfer function corresponding to the object height of 0
  • the curve of T represents the modulation transfer function corresponding to the object height at 0.050 mm in the tangential direction
  • the curve marked F2:R represents the object height at 0.05 mm in the sagittal direction (sagittal direction). ) Corresponding modulation transfer function.
  • FIG. 3A is a light trace diagram of the light reflected by a finger pressed on the upper surface of the display panel in FIG. 1 transmitted to the image sensor
  • FIG. 3B is a diffraction modulation transfer function of the image formed by the finger on the image sensor in FIG. 3A Graph.
  • FIG. 3A the light 111 reflected by the finger pressing on the upper surface S1 can be well imaged on the sensing surface S7 of the image sensor 210, and it can be clearly seen from FIG. 3B that, at various spatial frequencies All have a sufficiently large modulus of the modulation transfer function, which means that the fingerprint image can have a good contrast.
  • the curve labeled F0 represents the diffraction limit
  • the curve labeled F1 represents the modulation transfer function corresponding to the height of 0.
  • the curve labeled F3:T represents the modulation transfer function corresponding to the object height at 0.050 mm and in the meridian direction
  • the curve labeled F3:R represents the object height corresponding to the sagittal direction at 0.05 mm Modulation transfer function.
  • the mirror module images the fingerprint of the finger contacting the upper surface on the image sensor
  • the lens module forms a virtual image of the electrode structure
  • the electrodes are located between the virtual image and the Between image sensors. Therefore, fingerprints can be clearly imaged on the image sensor, but the electrode structure of the display panel cannot be imaged on the image sensor. In this way, the image sensor can sense a clear fingerprint image without being affected by the interference of the mesh, thereby enabling the fingerprint sensing module to achieve a higher fingerprint recognition success rate and accuracy rate.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

L'invention concerne un dispositif électronique (100) et un module de détection d'empreintes digitales (200). Le module de détection d'empreintes digitales (200) est applicable en étant configuré sous un écran d'affichage (110) et comprend un capteur d'images (210) et un module de lentille (220). Le capteur d'images (210) est configuré sous l'écran d'affichage (110). Le module de lentille (220) est configuré entre le capteur d'images (210) et l'écran d'affichage (110). L'écran d'affichage (110) est pourvu d'une surface supérieure (S1) avec laquelle un doigt d'un utilisateur est en contact, d'une surface inférieure (S3) faisant face au capteur d'images (210), et d'une structure d'électrode (116) disposée entre la surface supérieure (S1) et la surface inférieure (S3). Le module de lentille image l'empreinte digitale du doigt en contact avec la surface supérieure (S1) sur le capteur d'images (210), le module de lentille (220) forme une image virtuelle (117) de la structure d'électrode (116), et la structure d'électrode (116) est disposée entre l'image virtuelle (117) et le capteur d'images (210). Le module de détection d'empreintes digitales (200) empêche la structure d'électrode (116) d'être imagée sur le capteur d'images (210) et a ainsi un impact sur la qualité d'une image d'empreintes digitales.
PCT/CN2020/088377 2019-08-26 2020-04-30 Module de détection d'empreintes digitales et dispositif électronique WO2021036326A1 (fr)

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US11468705B1 (en) 2021-06-21 2022-10-11 Novatek Microelectronics Corp. Display device with a fingerprint sensing function

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