WO2021026684A1 - Module de reconnaissance d'empreintes digitales, système d'empreintes digitales optique dans l'écran, et dispositif électronique - Google Patents

Module de reconnaissance d'empreintes digitales, système d'empreintes digitales optique dans l'écran, et dispositif électronique Download PDF

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Publication number
WO2021026684A1
WO2021026684A1 PCT/CN2019/099983 CN2019099983W WO2021026684A1 WO 2021026684 A1 WO2021026684 A1 WO 2021026684A1 CN 2019099983 W CN2019099983 W CN 2019099983W WO 2021026684 A1 WO2021026684 A1 WO 2021026684A1
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WIPO (PCT)
Prior art keywords
lens
fingerprint
display panel
fingerprint identification
optical
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Application number
PCT/CN2019/099983
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English (en)
Chinese (zh)
Inventor
葛丛
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.)
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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 CN201980004004.8A priority Critical patent/CN111095272B/zh
Priority to PCT/CN2019/099983 priority patent/WO2021026684A1/fr
Publication of WO2021026684A1 publication Critical patent/WO2021026684A1/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 display technology, and in particular to a fingerprint identification module, an under-screen optical fingerprint system and an electronic device.
  • Optical fingerprint recognition is a method for fingerprint recognition in the display area of the screen based on optical characteristics.
  • the imaging principle of optical fingerprint recognition is that the transmitter emits light onto the finger. The peaks and troughs of the fingerprint cause differences in energy intensity due to different light absorption and reflection capabilities. The receiver at the bottom of the screen can effectively identify the difference in energy and obtain the brightness Different light and dark stripes are fingerprint image information.
  • the fingerprint recognition module in the prior art generally includes a lens group composed of at least one lens, a fingerprint recognition chip, etc.
  • the external light source emits infrared light to irradiate the finger on the surface of the display panel, and the fingerprint is detected by reflection on the finger. The light passes through the display panel and is incident on the lens group.
  • the lens group condenses the fingerprint detection light and forms a fingerprint image on the fingerprint recognition chip, so that the fingerprint recognition chip collects and recognizes the fingerprint image.
  • the lens group has asymmetrical aberrations during the imaging process, which will interfere with the imaging of the fingerprint image. Therefore, the fingerprint recognition module of the prior art has the problem of low fingerprint recognition accuracy.
  • the invention provides a fingerprint identification module, an under-screen optical fingerprint system and an electronic device to solve the problem of low fingerprint identification accuracy in the prior art.
  • a first aspect of the present invention provides a fingerprint identification module, which is arranged under the display panel.
  • the fingerprint identification module includes an optical lens group, a reflector, and a fingerprint identification chip.
  • the reflective surface of the reflector faces the outside of the display panel, and At least part of the reflective surface of the reflector faces the sensing surface of the fingerprint recognition chip.
  • the optical lens group is used to converge the light reflected by the finger on the surface of the display panel and form an image on the sensing surface.
  • the optical lens group includes at least one lens, and the The optical axis of the object side surface and/or the optical axis of the image side surface and the horizontal direction have an included angle of less than 90°.
  • the optical lens group further includes an aperture, and the aperture is arranged at the side of at least one lens.
  • the axis of the aperture and the horizontal direction have an included angle less than 90°.
  • the optical lens group includes a first lens and a second lens arranged in sequence from the object side to the image side, the aperture is arranged between the first lens and the second lens, and the fingerprint recognition light passes through the first lens. After the lens, the aperture, and the second lens, they are irradiated onto the reflective surface of the reflector.
  • the optical axis of the object side surface of the first lens is parallel to the horizontal direction.
  • the angle between the optical axis of the image side surface of the first lens and the horizontal direction is ⁇ 1, which satisfies 5° ⁇ 1 ⁇ 25°.
  • the focal length of the first lens is f1
  • the radius of curvature of the image side surface of the first lens is R2, satisfying: f1/R2>-2; and/or, the refractive index of the first lens n1 satisfies: n1>1.50, and the dispersion coefficient v1 of the first lens satisfies: v1>53.
  • the angle between the axis of the aperture and the horizontal direction is ⁇ 2, which satisfies 5° ⁇ 2 ⁇ 25°.
  • the angle between the optical axis of the image side surface and the optical axis of the object side surface of the second lens and the horizontal direction are both ⁇ 3, which satisfies 5° ⁇ 3 ⁇ 25°.
  • the focal length of the second lens is f2
  • the radius of curvature of the object side surface of the second lens is R3
  • the radius of curvature of the image side surface of the second lens is R4, which satisfies: 0 ⁇ f2/R3 ⁇ 1.5; -2 ⁇ f2/R4 ⁇ 0; and/or, the refractive index n2 of the second lens satisfies: n2>1.50, and the dispersion coefficient v2 of the second lens satisfies: v2>53.
  • the distance between the reflective surface of the reflector and the lower surface of the display panel is less than 1.7 mm; and/or the overall focal length of the optical lens group is less than 1.2 mm.
  • the object side surface and/or the image side surface of at least one lens is a rotationally symmetric aspheric surface.
  • the object side surface and/or the image side surface of the lens closest to the image side is a rotationally symmetric aspheric surface.
  • the optical lens group further includes an infrared-transmitting filter, and the infrared-transmitting filter is arranged on the side of at least one lens or on the surface of the fingerprint recognition chip to filter out visible light.
  • the infrared-transmitting filter is arranged on the object side surface of the lens closest to the object side in the optical lens group.
  • the reflector and the fingerprint identification chip are arranged at intervals in the thickness direction of the display panel, the fingerprint identification chip is arranged between the reflector and the display panel, and the optical lens group is arranged on the reflector and the fingerprint identification chip The side.
  • the fingerprint recognition module further includes a fixed support, and the reflector, fingerprint recognition chip and optical lens group are all fixed on the fixed support, and the fixed support and the display panel are relatively fixed.
  • the fixed support includes a bottom wall and a side wall, the fingerprint identification chip is arranged on the bottom wall, the side wall is arranged around the outer side of the fingerprint identification chip, and the side wall is provided with a fingerprint detection light for passing through
  • the optical lens group is arranged on the side of the opening, and the reflector is fixed and blocked at the top of the side wall.
  • the second aspect of the present invention provides an under-screen optical fingerprint system, including a display panel, a backlight module, and the above fingerprint identification module.
  • the backlight module is used to provide a backlight source for the display panel, and the fingerprint identification module is arranged on the display panel. And the backlight module.
  • the backlight module is arranged obliquely with respect to the display panel, and the fingerprint recognition module is arranged between the backlight module and the side with a larger distance between the display panel.
  • the fingerprint identification module is fixed on the display panel.
  • the fingerprint identification module is arranged at a position corresponding to the non-display area of the display panel.
  • the present invention further includes a light source assembly, the light source assembly includes a light source, and the light emitting surface of the light source faces the fingerprint recognition area of the display panel to illuminate the finger.
  • the light source assembly is arranged between the display panel and the fingerprint recognition module.
  • the light source is an infrared light source.
  • the light source assembly further includes an infrared transmissive shielding member capable of transmitting infrared light, and the infrared transmissive shielding member shields between the display panel and the infrared light source to shield the infrared light source.
  • a third aspect of the present invention provides an electronic device including the above-mentioned under-screen optical fingerprint system.
  • the invention provides a fingerprint identification module, an under-screen optical fingerprint system and an electronic device.
  • the fingerprint identification module is arranged under the display panel.
  • the fingerprint identification module includes: an optical lens group, a reflector, and a fingerprint identification chip.
  • the reflective surface faces the outside of the display panel, and at least part of the reflective surface of the reflector faces the sensing surface of the fingerprint identification chip.
  • the optical lens group is used to converge the light reflected by the finger on the surface of the display panel and form an image on the sensing surface.
  • the optical lens group includes at least One lens, and the optical axis of the object side surface and/or the optical axis of the image side surface of at least one lens and the horizontal direction have an included angle of less than 90°.
  • the optical axis of the object side surface of at least one lens and/or the optical axis of the image side surface and the horizontal direction have an angle of less than 90°, even if the object side surface and/or image side surface of the at least one lens are relative to the vertical
  • the direction is inclined at a certain angle, which can effectively correct asymmetric aberrations, thereby improving the fingerprint recognition accuracy of the fingerprint recognition module.
  • FIG. 1 is a schematic structural diagram of a fingerprint identification module provided by Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of an optical lens group in a fingerprint recognition module provided by Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of the structure of an under-screen optical fingerprint system in the prior art
  • Embodiment 4 is a schematic structural diagram of an under-screen optical fingerprint system provided in Embodiment 4 of the present invention.
  • FIG. 5 is a schematic diagram of another structure of the under-screen optical fingerprint system provided in the fourth embodiment of the present invention.
  • Fig. 1 is a schematic structural diagram of a fingerprint identification module provided by embodiment 1 of the present invention
  • Fig. 2 is a schematic structural diagram of an optical lens group in a fingerprint recognition module provided by embodiment 1 of the present invention; as shown in Figs. 1 and 2, fingerprint recognition
  • the module 3 is arranged under the display panel.
  • the fingerprint recognition module 3 includes an optical lens group 8, a reflector 9 and a fingerprint recognition chip 10.
  • the reflective surface of the reflector 9 faces the outside of the display panel, and at least part of the reflective surface of the reflector 9 faces The sensing surface 101 of the fingerprint recognition chip 10, the fingerprint recognition light passes through the optical lens group 8, and is reflected on the sensing surface 101 of the fingerprint recognition chip 10 through the reflector 9.
  • the optical lens group 8 is used to make the fingers on the surface of the display panel escape
  • the fingerprint recognition light formed by reflection converges and forms an image on the sensing surface 101.
  • the optical lens group 8 includes at least one lens.
  • the side of the lens close to the finger is called the object side surface of the lens
  • the side of the lens close to the fingerprint identification chip 10 is called the image side surface.
  • the optical axis of the object side surface and/or the optical axis of the image side surface of the at least one lens has an included angle of less than 90° with the horizontal direction.
  • the optical axis of the object side surface of at least one lens and/or the optical axis of the image side surface and the horizontal direction have an angle of less than 90°, even if the object side surface and/or image side of the at least one lens
  • the surface is inclined at a certain angle, which can effectively correct asymmetric aberrations, thereby improving the fingerprint recognition accuracy of the fingerprint recognition module.
  • the optical axis of a surface of the lens specifically refers to a cut plane at the center of the surface. A straight line perpendicular to the cut plane and passing through the center is the optical axis.
  • O1 The optical axis of the object-side surface of the lens
  • O2 the optical axis of the image-side surface
  • the optical axis O2 of the image-side surface and the horizontal direction have an acute angle ⁇ '
  • the optical axis O1 of the object side surface extends in the horizontal direction. It corresponds to the above-mentioned making the optical axis of the image side surface of the lens and the horizontal direction have an angle ⁇ '.
  • the recognition process of the fingerprint recognition module 3 of the above structure is that the fingerprint detection light formed on the finger passes through the display panel and is incident on the optical lens group 8, and passes through the optical lens group 8 to illuminate the reflector 9, and passes The reflector 9 is reflected on the sensing surface 101 of the fingerprint identification chip 10, where the optical lens group 8 is used to converge the fingerprint identification light and form an image on the sensing surface 101. Finally, the fingerprint image is collected and recognized by the fingerprint recognition chip 10.
  • the distance between the fingerprint identification chip 10 and the optical lens group 8 can be reduced, thereby reducing the thickness of the fingerprint identification module 3.
  • the outside of the display panel refers to the outer area of the display panel, and refers to the area above the display panel facing the user.
  • the reflective surface of the reflector 9 facing the outside of the display panel means that the reflective surface of the reflector 9 is set toward the upper side of the display panel, and the reflective surface At least part of the reflective surface of the device 9 faces the sensing surface 101 of the fingerprint identification chip 10 to ensure that the fingerprint detection light passing through the optical lens group 8 can be reflected by the reflector 9 and incident on the sensing surface 101.
  • the reflector 9 can be an infrared reflector or another reflector 9 with a reflective surface.
  • the main function of the optical lens group 8 is to make the fingerprint detection light on the finger 5 form a reduced and clear fingerprint image, and to form the fingerprint image on the sensing surface 101 of the fingerprint identification chip 10. Therefore, the optical lens The group 8 may include at least one lens for condensing light, for example, may include at least one convex lens.
  • the fingerprint recognition chip 10 can collect and recognize fingerprint information through natural white light or infrared light and other light of some specific wavelength bands, and an optical sensor can be selected.
  • the optical lens group 8 further includes an aperture 81, which is arranged at the side of at least one lens.
  • the aperture 81 is a device for controlling the amount of light passing through the lens, and the amount of light passing through the lens is controlled by changing the structural size of the aperture 81.
  • For its setting position for example, it can be set between two adjacent lenses, it can also be set to the side of the lens closest to the object side, or it can be set to the side of the lens closest to the image side.
  • the specific location is not specified. limit.
  • the optical axis of the object side surface and/or the optical axis of the image side surface of at least one lens and the horizontal direction have an angle of less than 90°
  • the axis and the horizontal direction of the aperture 81 also have an angle of less than 90°. °The included angle is convenient for use with the lens.
  • the object-side surface and/or the image-side surface of at least one lens is aspherical, preferably a rotationally symmetrical aspherical surface, which can reduce lens molding errors and improve the mass production feasibility of the entire optical lens group 8. More preferably, it may be a rotationally symmetric even-order aspheric surface.
  • the object side surface and/or the image side surface of the lens closest to the image side is a rotationally symmetric aspheric surface. In this way, distortion and imaging aberrations can be corrected by adjusting the aspheric coefficients, and the imaging quality of the optical lens group 8 can be improved, thereby increasing the recognition accuracy.
  • the optical lens group 8 include an infrared-transmitting filter, which is arranged at the side of at least one lens, or is arranged on the fingerprint identification chip 10.
  • the surface of can transmit infrared detection light with fingerprint signal, and filter out visible light at the same time, which can improve the imaging quality of the optical lens group 8, thereby increasing the recognition accuracy.
  • the method of forming the filter for example, it may be formed by vapor deposition.
  • the optical lens group 8 is prone to distortion and imaging aberrations during the fingerprint imaging process, which affects the imaging quality of the module and reduces the accuracy of fingerprint recognition. Therefore, for the optical lens group 8 The choice of parameters is very important. Next, a case where the optical lens group 8 is composed of two lenses and one diaphragm 81 will be described as an example.
  • the optical lens group 8 includes a first lens 82 and a second lens 83 arranged in sequence from the object side to the image side.
  • the aperture 81 is arranged between the first lens 82 and the second lens 83, and the fingerprint recognition light is transparent. After passing through the first lens 82, the aperture 81, and the second lens 83, it is irradiated to the reflective surface of the reflector 9.
  • the optical axis of the object side surface of the first lens 82 is parallel to the horizontal direction. Further, in order to correct asymmetry aberrations as much as possible, improve the imaging quality of the optical lens group 8, and thereby increase the accuracy of fingerprint recognition, the following conditions need to be met:
  • the angle between the optical axis O2 of the image side surface of the first lens 82 and the horizontal direction is ⁇ 1, which satisfies 5° ⁇ 1 ⁇ 25°.
  • the focal length of the first lens 82 is f1, and the radius of curvature of the image side surface of the first lens 82 is R2, satisfying: f1/R2>-2; and/or, the refractive index of the first lens 82 n1 satisfies: n1>1.50, and the dispersion coefficient v1 of the first lens 82 satisfies: v1>53.
  • the included angle between the axis O3 of the aperture 81 and the horizontal plane is ⁇ 2, which satisfies 5° ⁇ 2 ⁇ 25°.
  • the angle between the optical axis O4 of the image side surface and the optical axis O4 of the object side surface of the second lens 83 and the horizontal plane is both ⁇ 3, which satisfies 5° ⁇ 3 ⁇ 25°.
  • the focal length of the second lens 83 is f2
  • the radius of curvature of the object side surface of the second lens 83 is R3
  • the radius of curvature of the image side surface of the second lens 83 is R4, which satisfies: 0 ⁇ f2/R3 ⁇ 1.5 -2 ⁇ f2/R4 ⁇ 0; and/or, the refractive index n2 of the second lens 83 satisfies: n2>1.50, and the dispersion coefficient v2 of the second lens 83 satisfies: v2>53.
  • the distance between the reflective surface of the reflector and the surface of the display panel 1 close to the backlight module 2 should be less than 1.7 mm; and/or, the optical lens group
  • the overall focal length of 8 is less than 1.2 mm.
  • the object-side surface of the first lens 82 is a flat surface
  • the image-side surface of the first lens 82 is a flat surface
  • the object-side surface of the second lens 83 and the image-side surface of the second lens 83 are aspherical surfaces
  • the overall focal length of the optical lens group is f
  • the vertical distance from the inner surface of the display panel to the reflective surface of the reflector is H
  • the focal length of the second lens is f2
  • the radius of curvature of the object side surface of the second lens is R3
  • the radius of curvature of the image side surface of the second lens is R4.
  • Table 2 shows the aspherical high-order coefficients A2, A4, A6, A8, A10, A12, A14, A16 of the aspheric lens, where the coefficients of A2 are all 0:
  • the reflector 9 and the fingerprint identification chip 10 are arranged at intervals in the thickness direction of the display screen, and the fingerprint identification chip 10 is arranged between the reflector 9 and the display panel 1, and The optical lens group 8 is arranged on the side of the reflector 9 and the fingerprint recognition chip 10.
  • the fingerprint identification module 3 further includes a fixed support 31, a reflector 9, and a fingerprint identification chip 10 and the optical lens group 8 are both fixed on the fixed support 31, and the fixed support 31 and the display panel 1 are relatively fixed.
  • the fixing support 31 may be an integrally formed part, which can improve the accuracy of fixing each component compared with the case where the parts are formed separately and then bonded to each other.
  • the fingerprint identification chip 10 is a photosensitive element.
  • the fixed support 31 can also be set to be able to carry out the photosensitive surface of the fingerprint identification chip 10.
  • the shielding structure is specifically optional.
  • the fixed support 31 includes a bottom wall 32 and a side wall 33.
  • the fingerprint identification chip 10 is arranged on the bottom wall 32.
  • the side wall 33 is arranged around the outer side of the fingerprint identification chip 10.
  • the side wall 33 is provided with an opening 34 for passing the fingerprint detection light, the optical lens group 8 is arranged at the side of the opening 34, and the reflector 9 is fixed and shielded at the top of the side wall 33.
  • the bottom end of the fingerprint recognition chip 10 can be fixed on the circuit board, and the circuit board is fixed on the bottom wall 32.
  • the sensing surface 101 of the fingerprint recognition chip 10 is generally arranged on the top surface, and the fingerprint recognition chip 10 also has and On the side surface adjacent to the sensing surface 101 of the top surface, the side wall 33 can be arranged around the outside of the side surface of the fingerprint identification chip 10, and the opening 34 on the side wall 33 is provided with an optical lens group 8 on the side, so as to facilitate the transmission of the optical lens group 8.
  • the fingerprint recognition light enters the inside of the side wall 33, and the reflector 9 is fixed and shielded at the top of the side wall 33, so that the reflector 9, the side wall 33, and the bottom wall 32 can jointly enclose a space that can accommodate the fingerprint recognition chip 10.
  • the space also has an opening 34 for the light passing through the optical lens group 8 to enter and irradiate the reflector 9.
  • the height of the top of the side wall 33 from the bottom wall 32 needs to be greater than the height of the sensing surface 101 of the fingerprint identification chip 10 from the bottom wall 32.
  • the specific value of the distance between the reflective surface of the reflector 9 and the sensing surface 101 of the fingerprint identification chip 10 can be selected according to the focal length of the optical lens group 8 and the distance between the optical lens group 8 and the reflector 9 and so on. Repeat it again.
  • the fingerprint recognition module is arranged under the display panel.
  • the fingerprint recognition module includes an optical lens group, a reflector, and a fingerprint recognition chip.
  • the reflective surface of the reflector faces the outside of the display panel, and at least a part of the reflective surface of the reflector Facing the sensing surface of the fingerprint identification chip, the optical lens group is used to converge the light reflected by the finger on the surface of the display panel and image on the sensing surface.
  • the optical lens group includes at least one lens, and the optical axis of the object side surface of the at least one lens is /Or the optical axis of the image side surface and the horizontal direction have an included angle of less than 90°.
  • the object side surface of the first lens 82 is flat, the image side surface of the first lens 82 is flat, and the object side surface of the second lens 83 and the second lens 83
  • the curvature radius of the object side surface of the second lens 83 is R3, and the curvature radius of the image side surface of the second lens 83 is R4.
  • Table 4 is the aspherical high-order coefficients A2, A4, A6, A8, A10, A12, A14, A16 of the aspheric lens, where the coefficients of A2 are all 0:
  • the selection of some lens parameters of the first lens and the second lens is improved, so that the correction effect of imaging aberration and distortion is better.
  • this embodiment has improved the type of the curved surface of the image side surface of the first lens 82 and the selection of some parameters of the first lens 82 and the second lens 83.
  • One is the same and will not be repeated here.
  • Embodiment 1 in this embodiment:
  • the object-side surface of the first lens 82 is a flat surface
  • the image-side surface of the first lens 82 is aspherical
  • the object-side surface of the second lens 83 and the image-side surface of the second lens 83 are aspherical
  • optical The overall focal length of the lens group is f
  • the vertical distance from the inner surface of the display panel to the reflective surface of the reflector is H
  • the focal length of the first lens 82 is f1
  • the radius of curvature of the object side surface of the first lens 82 is R1
  • the radius of curvature of the image side surface of the lens 82 is R2
  • the focal length of the second lens 83 is f2
  • the radius of curvature of the object side surface of the second lens 83 is R3
  • the radius of curvature of the image side surface of the second lens 83 is R4.
  • Table 6 shows the aspherical high-order coefficients A2, A4, A6, A8, A10, A12, A14, A16 of the aspheric lens, where the coefficients of A2 are all 0.
  • the shape of the image side surface of the first lens and the selection of some lens parameters of the first lens and the second lens are improved, so that the correction effect of imaging aberration and distortion is better.
  • Fig. 3 is a schematic structural diagram of an under-screen optical fingerprint system in the prior art
  • Fig. 4 is a schematic structural diagram of an under-screen optical fingerprint system provided in embodiment 4 of the present invention
  • Fig. 5 is a schematic view of an under-screen optical fingerprint system provided in embodiment 4 of the present invention Schematic diagram of another structure of the system.
  • the prior art under-screen optical fingerprint system includes: a liquid crystal display panel 80, a backlight module 82 and a fingerprint recognition module 83.
  • the backlight module 82 is arranged between the liquid crystal display panel 80 and the fingerprint recognition module 83 ,
  • the backlight module 82 from the inside of the liquid crystal display panel 80 toward the outside includes: a reflective sheet, a light guide plate, a diffuser 84, a prism film 85, a reflective polarized brightness enhancement film, etc.
  • the fingerprint recognition module 83 generally includes an imaging device and a fingerprint recognition chip Wait. When in use, the infrared light emitted by an external light source is irradiated on the finger 86, and the fingerprint detection light reflected on the finger 86 passes through the backlight module 82 and is incident on the fingerprint recognition module 83.
  • the fingerprint recognition module 83 uses the imaging device to remove the fingerprint. The detection light forms a fingerprint image, and the fingerprint image is collected and recognized through the fingerprint recognition chip.
  • the fingerprint detection light formed on the finger 86 needs to pass through the prism film 85 and the diffuser 84 to reach the fingerprint recognition module.
  • the presence of the prism film 85 divides the fingerprint detection light into left and right.
  • the presence of the diffuser 84 will cause serious scattering of the fingerprint detection light, which will interfere with the imaging of the fingerprint image. Therefore, the under-screen optical fingerprint recognition system has the problem of low fingerprint recognition accuracy.
  • the under-screen optical fingerprint system of this embodiment includes the display panel 1, the backlight module 2, and the ones provided in the first to third embodiments.
  • the fingerprint identification module 3, the backlight module 2 is used to provide the backlight source for the display panel 1.
  • the fingerprint identification module 3 is arranged between the display panel 1 and the backlight module 2, and is used to receive the reflection of the finger 5 above the display panel 1.
  • the light that is, the fingerprint detection light reflected by the finger 5, performs fingerprint recognition.
  • the specific structure, function and principle of the fingerprint identification module 3 are described in detail in the first to third embodiments, and will not be repeated here.
  • the backlight module 2 is generally located behind the display panel 1, and its function is to supply sufficient brightness and uniformly distributed surface light sources so that the display panel 1 can display images normally.
  • the backlight module 2 from the inner side to the outer side of the display panel 1 includes: a reflective sheet 21, a light guide plate 22, a diffuser sheet 23, a lower prism film 24, an upper prism film 25, a reflective polarizing brightness enhancement film, and the like.
  • the light source emitted by the LEDs in the backlight module 2 passes through the light guide plate 22 to form a surface light source.
  • the light source is formed with a certain polarization state. ⁇ , provides a light source for the display panel 1.
  • the display panel 1 described in this embodiment may be a liquid crystal display panel, and the fingerprint recognition module 3 is an optical fingerprint recognition module 3 using optical fingerprint recognition technology, and is used to receive fingerprint detection formed by the reflection of the finger 5 above the display panel 1. Light and fingerprint recognition.
  • the fingerprint recognition module 3 of this embodiment is arranged between the display panel 1 and the backlight module 2.
  • the fingerprint detection light reflected by the finger 5 above the display panel 1 can be directly irradiated to the fingerprint recognition module 3 through the display panel 1. Fingerprint recognition is performed above.
  • the light reflected by the finger 5 does not need to pass through the imaging interference of the prism film of the backlight module 2, the diffusion sheet 23, etc., and can be directly irradiated onto the fingerprint recognition module 3 for fingerprint recognition. Therefore, the accuracy of fingerprint recognition is high.
  • the fingerprint recognition module 3 is arranged between the display panel 1 and the backlight module 2, which may make the gap between the display panel 1 and the backlight module 2 larger, resulting in the display panel 1.
  • the backlight module 2 and the display panel 1 can be inclined to each other to locally reduce the distance between the two.
  • the backlight module 2 is arranged obliquely with respect to the display panel 1
  • the fingerprint identification module 3 is arranged between the backlight module 2 and the side of the display panel 1 with a larger distance.
  • the backlight module 2 is inclined with respect to the display panel 1.
  • the backlight module 2 and the display panel 1 may be inclined between the surfaces facing each other.
  • the display panel 1 includes a first surface 11 facing the inner side of the display panel 1.
  • Group 2 includes a second surface 26 facing the display panel 1.
  • the first surface 11 and the second surface 26 are arranged opposite to each other.
  • the second surface 26 is opposite to the first surface 11. Tilt setting.
  • the distance between the backlight module 2 and the display panel 1 may specifically refer to the distance between the surfaces facing each other, for example, the distance between the first surface 11 and the second surface 26.
  • the fingerprint identification module 3 is arranged between the backlight module 2 and the side of the display panel 1 with a larger distance, specifically referring to the fingerprint identification module 3 arranged on the first surface 11 and the second surface 26 with a larger distance. Between the sides.
  • the second surface 26 is the light-emitting surface of the backlight module 2, and the second surface 26 is arranged obliquely with respect to the first surface 11, which specifically refers to that the backlight module 2 and the display panel 1 are arranged non-parallel, so that the light-emitting surface of the backlight module 2 and
  • the first surface 11 of the display panel 1 is arranged relatively obliquely, and the fingerprint identification module 3 is arranged between the first surface 11 and the second surface 26 with a larger distance, which means that when the first surface 11 and the second surface When the 26 is inclined, the distance between the different parts of the first surface 11 and the second surface 26 is different.
  • the first surface 11 and the second surface 26 are located on the left side.
  • the distance between the first surface 11 and the second surface 26 on the right side is greater than the distance between the fingerprint recognition module 3 can be installed on the first surface 11 and the second surface 26 on the left side. between.
  • the explanation here is that the distance between the left part of the first surface 11 and the second surface 26 is relatively large, and the distance between the right part of the first surface 11 and the second surface 26 may be relatively large.
  • the front side part (corresponding to the paper face inward direction is the front side) has a larger spacing
  • the rear side part (corresponding to the paper face outward direction is the back side) has a larger spacing
  • other parts have a larger spacing Larger.
  • the fingerprint recognition module 3 is arranged between the first surface 11 and the side with a larger distance between the second surface 26, and may be arranged at the left end of the backlight module 2 as shown in FIG. 4, or it may be At a position slightly to the right, as long as it can be achieved that the fingerprint identification module 3 can be roughly arranged on the left part of the first surface 11 and the second surface 26 with a larger distance.
  • the fingerprint recognition module 3 is arranged between the display panel 1 and the backlight module 2
  • the display panel 1 and the backlight module 2 are arranged in parallel, as shown in the comparison diagram of FIG. 5, the display panel 1 and the backlight module
  • the spacing between the groups 2 is obviously larger than that shown in FIG. 4, which will reduce the brightness of the display panel 1 and affect the user experience.
  • the display panel 1 and the backlight module 2 are inclined to each other. Taking into account the user’s usage habits, the display panel 1, that is, the first surface 11 can be arranged horizontally, and the backlight module 2 can be arranged inclined, so that the second The surface 26 is arranged obliquely with respect to the first surface 11.
  • the backside surface of the backlight module 2 facing away from the display panel 1 can also be parallel to the second surface 26, so as to form a space between the backside surface and the housing of the electronic device that can accommodate components such as circuit boards. To further reduce the thickness of the entire electronic device.
  • the display panel 1 is generally arranged horizontally with the housing of electronic devices such as mobile phones, and in this embodiment, the backlight module 2 is arranged obliquely with respect to the display panel 1. Therefore, in order to ensure that the fingerprint identification module 3 can detect the fingerprint formed by the finger 5 For better identification, the fingerprint identification module 3 can preferably be fixed on the display panel 1.
  • the fingerprint identification module 3 needs to be arranged at a position corresponding to the non-display area of the display panel 1. This can avoid affecting the normal display of the display panel 1.
  • the under-screen optical fingerprint system of this embodiment further includes a light source assembly 6, which includes The light source 61, and the light emitting surface of the light source 61 faces the fingerprint recognition area 12 of the display screen, so as to irradiate the finger 5, and make the finger 5 reflect the light emitted from the light source 61 to form fingerprint detection light.
  • the light source 61 here may be a light emitting diode or the like.
  • the light source 61 may be an infrared light source, such as an infrared light-emitting diode.
  • the light source assembly 6 can be arranged between the display panel 1 and the backlight module 2, so that the light emitted by the light source 61 can pass through the display panel 1 and irradiate the finger 5. More specifically, As shown in FIG. 4, the light source assembly 6 can be arranged between the fingerprint identification module 3 and the display panel 1. That is, the light source assembly 6 is arranged below the fingerprint identification module 3. Compared with the solution in which the light source assembly 6 and the fingerprint identification module 3 are arranged at the same height, the light emitted by the light source assembly 6 can avoid causing the fingerprint identification chip 10 as much as possible. interference.
  • an infrared light-transmitting shield 62 can also be optionally provided between the infrared light source 61 and the display panel 1.
  • the light source assembly 6 also includes a light source capable of transmitting infrared light.
  • the infrared transparent shield 62 is shielded between the display screen and the infrared light source 61 to shield the infrared light source 61 so that the infrared light source 61 is invisible on the front of the display panel 1.
  • the infrared-transmitting shield 62 can transmit the infrared light emitted by the infrared light source 61 and does not affect the formation of fingerprint detection light on the surface of the finger 5.
  • the infrared transparent shield 62 may include a horizontal plate 63 and a vertical plate 64. Both the horizontal plate 63 and the vertical plate 64 are fixed on the first surface 11, and one end of the horizontal plate 63 and the vertical plate 64 One end of the light source 61 is connected so that the horizontal plate 63 and the vertical plate 64 jointly enclose a receiving cavity capable of accommodating the light source 61.
  • the horizontal plate 63 and the vertical plate 64 may be transparent parts, and the surface is coated with infrared-permeable ink to prevent visible light from passing through and to allow infrared light to pass through.
  • the under-screen optical fingerprint system includes a display panel, a backlight module, and the aforementioned fingerprint identification module.
  • the backlight module is used to provide a backlight source for the display panel
  • the fingerprint identification module is arranged between the display panel and the backlight module. between.
  • the electronic device may specifically be a liquid crystal display device, electronic paper, mobile phone, tablet computer, television, notebook computer, digital Electronic products or components such as photo frames, navigators, fingerprint locks, etc.
  • connection should be understood in a broad sense.
  • it can be a fixed connection or an intermediate connection.
  • the medium is indirectly connected, which can be the internal communication between two elements or the interaction between two elements.

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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 module de reconnaissance d'empreintes digitales (3), un système d'empreintes digitales optique dans l'écran, et un dispositif électronique. Le module de reconnaissance d'empreintes digitales (3) est disposé sous un panneau d'affichage (1), et comprend un groupe de lentilles optiques (8), un réflecteur (9) et une puce de reconnaissance d'empreintes digitales (10). Une surface de réflexion du réflecteur (9) fait face à un côté extérieur du panneau d'affichage (1), et au moins une partie de la surface de réflexion du réflecteur (9) fait face à une surface de détection (101) de la puce de reconnaissance d'empreintes digitales (10). Le groupe de lentilles optiques (8) est utilisé pour faire converger des faisceaux lumineux réfléchis par un doigt (5) sur une surface du panneau d'affichage (1) et pour former une image sur la surface de détection (101). Le groupe de lentilles optiques (8) comprend au moins une lentille (82-83), et l'axe optique (O1, O4) de la ou des lentilles (82-83) sur une surface latérale d'objet et/ou l'axe optique (O2, O4) de la ou des lentilles (82-83) sur une surface côté image ont un angle inclus (θ1, θ3) inférieur à 90 degrés par rapport à une direction horizontale. L'invention améliore la précision de la reconnaissance d'empreintes digitales.
PCT/CN2019/099983 2019-08-09 2019-08-09 Module de reconnaissance d'empreintes digitales, système d'empreintes digitales optique dans l'écran, et dispositif électronique WO2021026684A1 (fr)

Priority Applications (2)

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CN201980004004.8A CN111095272B (zh) 2019-08-09 2019-08-09 指纹识别模组、屏下光学指纹系统及电子装置
PCT/CN2019/099983 WO2021026684A1 (fr) 2019-08-09 2019-08-09 Module de reconnaissance d'empreintes digitales, système d'empreintes digitales optique dans l'écran, et dispositif électronique

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PCT/CN2019/099983 WO2021026684A1 (fr) 2019-08-09 2019-08-09 Module de reconnaissance d'empreintes digitales, système d'empreintes digitales optique dans l'écran, et dispositif électronique

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US20150189136A1 (en) * 2014-01-02 2015-07-02 Samsung Electro-Mechanics Co., Ltd. Fingerprint sensor and electronic device including the same
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