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WO2021093487A1 - Appareil d'identification optique d'empreintes digitales, procédé d'identification optique d'empreintes digitales et terminal tactile - Google Patents

Appareil d'identification optique d'empreintes digitales, procédé d'identification optique d'empreintes digitales et terminal tactile Download PDF

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Publication number
WO2021093487A1
WO2021093487A1 PCT/CN2020/119491 CN2020119491W WO2021093487A1 WO 2021093487 A1 WO2021093487 A1 WO 2021093487A1 CN 2020119491 W CN2020119491 W CN 2020119491W WO 2021093487 A1 WO2021093487 A1 WO 2021093487A1
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WO
WIPO (PCT)
Prior art keywords
layer
aperture
diaphragm
fingerprint identification
optical fingerprint
Prior art date
Application number
PCT/CN2020/119491
Other languages
English (en)
Chinese (zh)
Inventor
王海生
杨沐
Original Assignee
北京迈格威科技有限公司
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
Priority claimed from CN201911099210.XA external-priority patent/CN110674798A/zh
Application filed by 北京迈格威科技有限公司 filed Critical 北京迈格威科技有限公司
Priority to KR2020227000012U priority Critical patent/KR20220000736U/ko
Publication of WO2021093487A1 publication Critical patent/WO2021093487A1/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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition

Definitions

  • the present disclosure relates to the technical field of display terminals, and in particular, to an optical fingerprint identification device, an optical fingerprint identification method, and a touch terminal.
  • Full screen is the mainstream configuration of current mobile phones, and the use of full screen mobile phones also makes organic light-emitting diode (OLED) screen fingerprints a popular research direction.
  • OLED organic light-emitting diode
  • optical lens lens
  • the distance between multiple optical lenses Closer it is easy to produce crosstalk of light, which affects the imaging effect of the optical imaging structure.
  • the purpose of the present disclosure includes, for example, providing an optical fingerprint identification device and a touch terminal, for example, to alleviate the technical problem of light crosstalk in the prior art.
  • the embodiment of the present disclosure provides an optical fingerprint identification device, which is configured to be arranged under the OLED display device, wherein the optical fingerprint identification device starts from the side close to the OLED display device and includes from top to bottom:
  • the microlens layer includes a plurality of microlenses, the diaphragm layer includes a plurality of diaphragm holes, and the photosensitive sensor array includes a plurality of photosensitive sensing units; microlenses and diaphragm holes One-to-one correspondence; each micro-lens corresponds to a photosensitive sensor unit; the light signal from the direction of the OLED display device, which is reflected by the finger, passes through the micro-lens, and then passes through the aperture of at least one diaphragm layer to be photosensitive The sensing unit receives.
  • the above-mentioned optical fingerprint identification device further includes an infrared filter layer disposed between the microlens layer and the photosensitive sensor array.
  • the above-mentioned aperture layer is two layers, including a first aperture layer and a second aperture layer, wherein the aperture of the aperture of the first aperture layer close to the microlens layer is larger than The aperture of the aperture of the second aperture layer on the side of the photosensitive sensor array; the aperture of each aperture of the first aperture layer is the same, and the aperture of each aperture of the second aperture layer is the same.
  • the above-mentioned optical fingerprint identification device further includes a first transparent medium layer and a second transparent medium layer; a microlens layer, a first transparent medium layer, a first diaphragm layer, a second transparent medium layer, The infrared filter layer and the second diaphragm layer are arranged in sequence.
  • the thickness of the first diaphragm layer is 0.8 ⁇ m to 3 ⁇ m; the thickness of the second diaphragm layer is 0.8 ⁇ m to 3 ⁇ m; the aperture of the diaphragm hole of the first diaphragm layer is 5 ⁇ m to 3 ⁇ m. 15 ⁇ m, the aperture of the diaphragm hole of the second diaphragm layer is 1.5 ⁇ m to 8 ⁇ m; the distance between the first diaphragm layer and the second diaphragm layer is 5 ⁇ m to 20 ⁇ m; the first transparent medium layer is 5 ⁇ m to 20 ⁇ m; the infrared filter layer The thickness is 5 ⁇ m to 8 ⁇ m.
  • the above-mentioned optical fingerprint identification device further includes a buffer layer disposed between the infrared filter layer and the second aperture layer; the buffer layer is a silicon oxide layer or a silicon nitride layer.
  • the above-mentioned optical fingerprint identification device further includes a color filter film layer disposed between the microlens layer and the photosensitive sensor array.
  • the above-mentioned color filter film layer is arranged adjacent to the micro lens layer.
  • the thickness of the above-mentioned color filter film layer is 0.6 ⁇ m to 2 ⁇ m.
  • the above-mentioned aperture layer includes: a third aperture layer close to the side of the microlens layer, a fifth aperture layer close to the side of the photosensitive sensor array, and a fifth aperture layer disposed on the photosensitive sensor array and the fifth aperture layer.
  • At least one metal diaphragm layer in between; the apertures of the diaphragm holes on the third diaphragm layer, the fifth diaphragm layer and the at least one metal diaphragm layer decrease sequentially from top to bottom.
  • the above-mentioned aperture layer further includes: a fourth aperture layer disposed between the third aperture layer and the fifth aperture layer.
  • the above-mentioned infrared filter layer is disposed between the metal diaphragm layer and the fifth diaphragm layer.
  • the above-mentioned device further includes: a transparent protective layer disposed between the metal diaphragm layer and the infrared filter layer.
  • the above-mentioned device further includes: a third transparent medium layer arranged between the third aperture layer and the fourth aperture layer, and a third transparent medium layer arranged between the fourth aperture layer and the fifth aperture layer.
  • the fourth transparent medium layer between the middle, the fifth transparent medium layer and the sixth transparent medium layer arranged between the third aperture layer and the microlens layer from bottom to top; wherein, the sixth transparent medium layer is a flat medium layer .
  • the aperture of each aperture of the third aperture layer is 8 ⁇ m to 20 ⁇ m
  • the aperture of each aperture of the fourth aperture layer is 6 ⁇ m to 10 ⁇ m
  • the aperture of the fifth aperture layer is 6 ⁇ m to 10 ⁇ m.
  • the aperture of each diaphragm hole is 6 ⁇ m to 7 ⁇ m
  • the aperture of each diaphragm hole of the metal diaphragm layer is 1.5 ⁇ m to 4 ⁇ m.
  • An embodiment of the present disclosure also provides a touch terminal, including an OLED display device and the optical fingerprint identification device described in the first aspect; the optical fingerprint identification device is installed under the OLED display device.
  • the embodiments of the present disclosure also provide an optical fingerprint identification method, which is applied to the above-mentioned optical fingerprint identification device, and includes:
  • the photosensitive sensor unit on the photosensitive sensor array receives the reflected light passing through the corresponding aperture to generate a fingerprint light sensing signal for fingerprint identification.
  • the optical fingerprint identification device can be arranged under the OLED display device, and, starting from the side close to the OLED display device, the optical fingerprint identification device is from the top It includes: a microlens layer, at least one diaphragm layer, and a photosensitive sensor array; wherein the microlens layer includes a plurality of microlenses, the diaphragm layer includes a plurality of aperture holes, and the photosensitive sensor array includes a plurality of photosensitive sensors.
  • the microlens corresponds to the aperture hole one-to-one, and each microlens corresponds to one of the above-mentioned photosensitive sensing unit, so that the light signal from the direction of the OLED display device after being reflected by the finger can pass through the microlens, and then Through the aperture of at least one layer of aperture layer, the light receiving angle of the reflected light signal is limited by the aperture hole, and the angle of the reflected light signal is limited to a small angle range above it, so that the reflected light When the signal is received by the photosensitive sensor unit, the phenomenon of light crosstalk is reduced, thereby improving the imaging effect of the optical imaging structure.
  • FIG. 1 is a schematic structural diagram of an optical fingerprint identification device provided by an embodiment of the disclosure
  • FIG. 2 is a schematic diagram of light propagation of an optical fingerprint identification device provided by an embodiment of the disclosure
  • FIG. 3 is a schematic structural diagram of another optical fingerprint identification device provided by an embodiment of the disclosure.
  • FIG. 4 is a schematic structural diagram of another optical fingerprint identification device provided by an embodiment of the disclosure.
  • FIG. 5 is a schematic structural diagram of another optical fingerprint identification device provided by an embodiment of the disclosure.
  • FIG. 6 is a schematic structural diagram of another optical fingerprint identification device provided by an embodiment of the disclosure.
  • FIG. 7 is a schematic flowchart of an optical fingerprint identification method provided by an embodiment of the disclosure.
  • Icon 20-microlens layer; 30-aperture layer; 40-photosensitive sensor array layer; 202-microlens; 302-aperture aperture; 50-infrared filter layer; 60-first transparent medium layer; 70-section Two transparent medium layer; 80-substrate layer; 90-buffer layer; 91-color filter film layer; 303-first diaphragm layer; 304-second diaphragm layer; 305-transparent protective layer; 306-third light Stop layer; 307-fourth stop layer; 308-fifth stop layer; 309-metal stop layer; 310-third transparent medium layer; 311-fourth transparent medium layer; 312-fifth transparent medium layer; 313-Sixth transparent medium layer.
  • optical lens structures such as OLED display devices, etc.
  • optical lens structures are micro-lens structures.
  • the photosensitive sensor array is usually required Each photosensitive sensor unit is provided with a corresponding microlens.
  • the optical fingerprint identification device and the touch terminal provided by the embodiments of the present disclosure can effectively alleviate the above-mentioned problems.
  • optical fingerprint identification device disclosed in the embodiment of the present disclosure is first introduced in detail.
  • an embodiment of the present disclosure provides an optical fingerprint identification device.
  • the optical fingerprint identification device provided in an embodiment of the present disclosure can be used to be installed under the OLED display device, from close to the OLED display device. Starting from one side, from top to bottom, it includes: a microlens layer, at least one diaphragm layer, and a photosensitive sensor array.
  • FIG. 1 is a schematic structural diagram of an optical fingerprint identification device, in which the microlens layer 20, the diaphragm layer 30 and the photosensitive sensor array layer 40 are shown in order from top to bottom in FIG. 1, and, For ease of description, in FIG. 1, only two aperture layers 30 are exemplarily shown. In other embodiments, the number of aperture layers may also have other values, and the actual usage conditions shall prevail. The present disclosure The embodiment does not limit this.
  • the microlens layer 20 includes a plurality of microlenses 202, the diaphragm layer includes a plurality of aperture holes 302, and the photosensitive sensor array includes a plurality of photosensitive sensing units PD; and, the microlens There is a one-to-one correspondence with the diaphragm hole; each microlens corresponds to a photosensitive sensor unit PD, and each microlens in the embodiment shown in FIG. 1 corresponds to the photosensitive sensor unit PD one-to-one.
  • the light signal reflected by the finger from the direction of the OLED display device passes through the micro lens, and then passes through the aperture of at least one aperture layer, and is received by the photosensitive sensor unit.
  • FIG. 2 shows a schematic diagram of light propagation of an optical fingerprint identification device, in which the OLED display device in FIG. 2 as a whole includes, from top to bottom, a glass cover plate, a transparent optical adhesive layer, a polarizing layer, and a touch screen.
  • the OLED When the OLED is lit, the light intensity of the OLED display will illuminate the finger valley and ridge. Because the valley area is the interface between the glass cover and the air, the ridge area is the finger skin. The intensity of light reflected relative to the ridge will be greater.
  • the optical fingerprint recognition device can distinguish the position of the valley ridge, it is assumed that the valley and the ridge each have a position of light to reflect.
  • the black light (solid line) represents the reflected light at a small angle, and the dotted line represents the light at other angles. From the structure shown in Figure 2, it can be seen that after the nearly vertical light passes through the OLED display device, it is condensed by the microlens, and can pass through the aperture of the aperture layer to reach the photosensitive sensor array, and be converted into a corresponding electrical signal and read out.
  • the optical fingerprint identification device provided by the embodiment of the present disclosure can reduce the microlens by arranging the diaphragm layer under the microlens layer. The mutual interference between the optical paths in order to improve the overall reliability of the optical fingerprint identification device.
  • the optical fingerprint identification device can be arranged under the OLED display device, and, starting from the side close to the OLED display device, the optical fingerprint identification device includes from top to bottom: microlens Layer, at least one diaphragm layer, and a photosensitive sensor array; wherein the microlens layer includes a plurality of microlenses, the diaphragm layer includes a plurality of diaphragm holes, the photosensitive sensor array includes a plurality of photosensitive sensing units, and the microlens and The aperture holes are one-to-one, and each microlens corresponds to one of the above-mentioned photosensitive sensing units, so that the light signal from the OLED display device direction after being reflected by the finger can pass through the microlens and then pass through at least one diaphragm layer Through the aperture hole, the light receiving angle of the reflected light signal is limited, and the angle of the reflected light signal is limited to a small angle range
  • the photosensitive sensor array includes a plurality of photosensitive sensor units usually arranged at the lower end of the aperture, and the lowermost diaphragm layer is close to the photosensitive sensor unit of the photosensitive sensor array, for example, it can be directly covered on the photosensitive sensor array That is, the photosensitive sensor unit PD in FIGS. 1 and 2 is arranged at the corresponding position under the diaphragm hole, so that the light receiving part of the photosensitive sensor unit PD is aligned with the diaphragm hole, and then the reflection from the finger is received After the light signal.
  • the optical fingerprint identification device provided by the embodiment of the present disclosure further includes an infrared filter layer arranged between the microlens layer and the photosensitive sensor array to filter out infrared light and eliminate the influence of infrared light on fingerprints.
  • an infrared filter layer arranged between the microlens layer and the photosensitive sensor array to filter out infrared light and eliminate the influence of infrared light on fingerprints.
  • Figure 3 shows a schematic structural diagram of another optical fingerprint identification device, and, in Figure 3, the optical fingerprint identification device includes two diaphragm layers as an example for description, that is, two The layer diaphragm layer is only exemplary. In other embodiments, the number of diaphragm layers may also have other values, which are specifically subject to actual usage conditions, which are not limited in the embodiments of the present disclosure.
  • FIG. 3 also includes a substrate layer 80, and the above-mentioned photosensitive sensor array is usually arranged in the substrate layer 80, as shown in FIG. 3, the manner in which a plurality of photosensitive sensor units PD are arranged in the substrate layer 80.
  • the diaphragm layer on the side close to the microlens layer is usually referred to as the first diaphragm layer, and the diaphragm layer on the side close to the photosensitive sensor array It becomes the second diaphragm layer, that is, the first diaphragm layer 303 and the second diaphragm layer 304 in FIG. 3, and the aperture of the diaphragm hole of the first diaphragm layer 303 on the side of the microlens layer is larger than that near the photosensitive layer.
  • the aperture of the aperture of the second aperture layer 304 on the sensor array side can further limit the light collection angle of the optical signal passing through the first aperture layer, which can effectively prevent the optical signals transmitted by adjacent microlenses from reaching the same PD. Causes the problem of light crosstalk.
  • the aperture of the diaphragm hole included in each diaphragm layer can be set to the same size, that is, the aperture of each diaphragm hole of the first diaphragm layer is the same, and the second The aperture of each diaphragm hole of the diaphragm layer is the same.
  • the embodiment shown in FIG. 3 is the embodiment in which the size of the diaphragm hole in each diaphragm layer is the same.
  • each diaphragm layer includes more than one diaphragm.
  • the apertures can also be set to apertures of different sizes according to actual use conditions to meet the requirements for receiving optical signals. Specifically, they may be set according to actual use conditions, which are not limited in the embodiments of the present disclosure.
  • Figure 3 shows an embodiment in which the infrared filter layer is arranged between two diaphragm layers.
  • the infrared filter layer may also be arranged above the first diaphragm layer, or arranged on the first diaphragm layer.
  • the light signal reaching the PD can also be filtered to eliminate the influence of infrared light on the fingerprint imaging image.
  • the specific setting method can continue to be set according to the actual use situation. The embodiment of the present disclosure does not Make restrictions.
  • the optical fingerprint identification device further includes a first transparent medium layer 60 and a second transparent medium layer 70; the aforementioned microlens layer 20, the first transparent medium layer 60, and the first aperture
  • the layer 303, the second transparent medium layer 70, the infrared filter layer 50, and the second aperture layer 304 are arranged in sequence, and the substrate layer 80 containing a plurality of photosensitive sensing units PD is arranged under the second aperture layer 304.
  • the thickness of the first diaphragm layer may range from 0.8 ⁇ m to 3 ⁇ m; the thickness of the second diaphragm layer may range from 0.8 ⁇ m to 3 ⁇ m; wherein the aperture of the diaphragm hole of the first diaphragm layer The range may be 5 ⁇ m to 15 ⁇ m, and the aperture range of the diaphragm hole of the second diaphragm layer may be 1.5 ⁇ m to 8 ⁇ m, that is, it is ensured that the aperture of the first diaphragm layer is larger than that of the second diaphragm layer. ⁇ pore size.
  • the distance between the first diaphragm layer and the second diaphragm layer may range from 5 ⁇ m to 20 ⁇ m; the thickness of the first transparent medium layer may range from 5 ⁇ m to 20 ⁇ m; the thickness of the infrared filter layer may range from 5 ⁇ m to 8 ⁇ m.
  • the height range of the microlens is generally 2 ⁇ m to 3 ⁇ m, and the diameter of the microlens can be 10 ⁇ m to 20 ⁇ m.
  • Membrane thickness The height of the microlens 3.0 ⁇ m The diameter of the microlens 12.5 ⁇ m First transparent medium layer 8.2 ⁇ m The thickness of the first diaphragm layer 1.3 ⁇ m The aperture of the diaphragm hole of the first diaphragm layer 5.0 ⁇ m The aperture of the diaphragm hole of the second diaphragm layer 1.75 ⁇ m Infrared filter layer thickness 6.3 ⁇ m The thickness of the second diaphragm layer 1.0 ⁇ m The distance between the first diaphragm layer and the second diaphragm layer 8.2 ⁇ m
  • the thickness of the above-mentioned second transparent medium layer can be set according to the distance between the first aperture layer and the second aperture layer in Table 1, so as to ensure the distance between the first aperture layer and the second aperture layer.
  • the spacing meets the design requirements.
  • the various layer structures shown in FIG. 3 can be grown on the substrate layer 80 containing the photosensitive sensor unit PD in a layer-by-layer manner, or the above-mentioned layers can be separately manufactured into corresponding optical layer structures. , And then assembled to form the optical fingerprint identification device shown in FIG. 3.
  • the specific production process can be set according to the actual use situation, and the embodiment of the present disclosure does not limit this.
  • the above-mentioned optical fingerprint identification device may also include a buffer layer arranged between the infrared filter layer and the second aperture layer; specifically, on the basis of FIG. 3, FIG. 4 also shows another A schematic structural diagram of an optical fingerprint identification device, in addition to the structure shown in FIG. 3, also includes a buffer layer 90.
  • the buffer layer 90 is generally a silicon oxide layer or a silicon nitride layer, so as to form a relatively flat surface on the second aperture layer 304, which not only facilitates the growth of the infrared filter layer 50, but also contributes to the improvement of the second aperture layer. 304 for protection.
  • the optical fingerprint identification device further includes a color filter film layer disposed between the microlens layer and the photosensitive sensor array.
  • the color filter film layer is arranged adjacent to the microlens layer, so as to add a color filter film (Color Filter, CF film), such as red, green, and green, to the position of the corresponding pixel of each photosensitive sensor unit in the photosensitive sensor array.
  • the blue filter film is used to determine whether the fingerprint image originated from a real finger or a fake finger by collecting light signals of a specific spectrum, so as to achieve live fingerprint detection.
  • CF film Color Filter
  • a color filter film layer 91 is shown, and the thickness of the color filter film layer 91 may generally range from 0.6 ⁇ m to 2 ⁇ m, and as shown in FIG. 4
  • the color filter film layer 91 is disposed under the microlens layer 20, that is, between the microlens layer 20 and the first transparent medium layer 60, so as to facilitate the collection and collection of optical signals of a specific spectrum. Filter processing.
  • the light-receiving angle of the photosensitive sensor unit can be limited to about ⁇ 4°, preferably ⁇ 1.5°, and the multi-layered diaphragm layer can also solve the problem of adjacent micro
  • the light signal transmitted by the lens reaches the light crosstalk problem caused by the photosensitive sensing unit, which effectively improves the overall reliability of the optical fingerprint identification device.
  • FIG. 5 also shows a schematic structural diagram of another optical fingerprint identification device.
  • the diaphragm layer of the optical fingerprint recognition device includes: a third diaphragm layer close to the microlens layer side, a fifth diaphragm layer close to the photosensitive sensor array side, and at least one that is arranged between the photosensitive sensor array and the fifth diaphragm layer.
  • the optical fingerprint recognition device shown in FIG. 5 includes a third diaphragm layer 306, a fifth diaphragm layer 308, and a metal diaphragm layer 309, in which the optical fingerprint recognition device shown in FIG.
  • FIG. 5 includes a third diaphragm layer 306, a fifth diaphragm layer 308, and a metal diaphragm layer 309. It is explained that only one metal diaphragm layer 309 is shown in FIG. 5, and, in order to achieve a better light path effect, as shown in FIG. 5, the third diaphragm layer 306, the fifth diaphragm layer 308 and The apertures of the diaphragm holes on at least one metal diaphragm layer decrease in order.
  • the above-mentioned at least one metal aperture layer can be arranged in the form of one to three layers, while in FIG. 5, only the form of one metal aperture layer is exemplarily shown, and the above-mentioned metal aperture layer It can be directly covered on the photosensitive sensor array.
  • the aperture of the diaphragm hole of the metal diaphragm layer is 1.5 ⁇ m to 4 ⁇ m, which can further reduce the crosstalk between the light transmitted to the crosstalk between the light sensor arrays.
  • the optical fingerprint recognition device may also include a fourth diaphragm layer.
  • the diaphragm layer further includes: The fourth diaphragm layer 307 between the three diaphragm layer 306 and the fifth diaphragm layer 308.
  • the optical fingerprint recognition device includes three diaphragm layers: a third diaphragm layer 306, a fourth diaphragm layer 307, and a fifth diaphragm layer 308.
  • the apertures of the apertures on the third aperture layer 306, the fourth aperture layer 307, and the fifth aperture layer 308 are sequentially reduced from top to bottom, and
  • the above-mentioned three-layer diaphragm layer can be made of metal material or other materials.
  • the optical fingerprint recognition device shown in FIG. 5 includes a third aperture layer 306, a fourth aperture layer 307, a fifth aperture layer 308, and a metal aperture layer 309 in order from top to bottom, and The apertures of the above-mentioned diaphragm holes of each layer are sequentially reduced.
  • the number of metal diaphragm layers, and the arrangement of the fourth diaphragm layer and at least one metal diaphragm layer can also be implemented according to actual use conditions. Setting, the embodiment of the present disclosure does not limit this.
  • the above-mentioned infrared filter layer 50 in FIG. 5 is disposed between the metal diaphragm layer 309 and the fifth diaphragm layer 308.
  • the above-mentioned optical fingerprint identification device further includes: a transparent protective layer 305 (as shown in FIG. 6) disposed between the metal diaphragm layer 309 and the infrared filter layer 50.
  • the transparent protective layer 305 can be a silicon oxide layer or a silicon nitride layer, and is generally located on the upper surface of the metal diaphragm layer.
  • a relatively flat surface can be formed on the upper surface of the metal diaphragm layer. Structure, the flat surface provided by the transparent protective layer 305 facilitates the coating of the infrared filter layer, facilitates the deposition and growth of the infrared filter layer on the transparent protective layer, and can also protect the metal diaphragm layer.
  • the optical fingerprint identification device shown in FIGS. 5-6 further includes: a third transparent medium layer 310, which is arranged between the third aperture layer 306 and the fourth aperture layer 307, The fourth transparent medium layer 311 disposed between the fourth diaphragm layer 307 and the fifth diaphragm 308 layer, and the fifth transparent medium layer disposed between the third diaphragm layer 306 and the microlens layer in order from bottom to top 312 and the sixth transparent medium layer 313; among them, the sixth transparent medium layer is a flat medium layer. That is, each diaphragm layer is covered with a transparent medium layer, and there is a flat medium layer on the uppermost transparent medium layer, and the micro lens layer 20 is provided on the flat medium layer.
  • the aperture range of each aperture of the third aperture layer may be 8 ⁇ m to 20 ⁇ m
  • the aperture range of each aperture of the fourth aperture layer may range from 6 ⁇ m to 10 ⁇ m
  • each of the fifth aperture layer The aperture range of the diaphragm hole may be 6 ⁇ m to 7 ⁇ m
  • the aperture range of each diaphragm hole of the metal diaphragm layer may be 1.5 ⁇ m to 4 ⁇ m. Therefore, for an optical fingerprint identification device including three diaphragm layers, each diaphragm layer is provided with diaphragm holes, and the apertures of different diaphragm layers gradually increase from bottom to top.
  • the centers of the multiple microlenses included in the microlens layer can be aligned vertically with the centers of the apertures of the corresponding diaphragm layers and the centers of the corresponding photosensitive sensing units.
  • the light-receiving photosensitive unit can be defined by the foregoing structure.
  • the light-receiving angle of the sensing unit for example, the light-receiving angle can be limited to within ⁇ 4°, for example, for the metal diaphragm layer, the aperture of 2um corresponds to ⁇ 1.5°, the aperture of 4um corresponds to ⁇ 4°, and multi-layer
  • the provided aperture layer can prevent the light signals transmitted by adjacent microlenses from reaching the same photosensitive sensing unit, effectively avoiding the problem of crosstalk between light rays.
  • the substrate layer 80 in FIG. 5 generally can be a silicon substrate layer, which forms a silicon-based photosensitive sensor array together with a photosensitive sensor array.
  • the silicon-based photosensitive sensor array has a photosensitive area, and the photosensitive sensor array includes a plurality of photosensitive sensor units.
  • the photosensitive area is distributed in an array.
  • a microlens corresponds to a photosensitive sensor unit PD.
  • Not all photosensitive sensor units correspond to a microlens.
  • lens corresponding PD but also does not correspond with a PD microlenses; for not corresponding to the microlens of the PD, which does not receive light from the microlenses fingerprint image, which can be idle or perform other functions by receiving the other light, for the
  • the PD corresponding to the microlens is used to detect the light signal reflected by the finger surface.
  • the embodiments of the present disclosure also provide a touch terminal, which may be a touch terminal such as a mobile phone, a tablet computer, etc., and is particularly suitable for a full-screen mobile phone.
  • the touch terminal includes an OLED display device and the optical fingerprint recognition device provided in any of the above embodiments.
  • the optical fingerprint recognition device is installed under the OLED display device. The two can be fixed by a frame sticker, with air or low refraction in the middle. Rate of material filling.
  • the touch terminal provided in the embodiments of the present disclosure includes all the technical features of the optical fingerprint identification device provided in the above embodiments, it can solve the same technical problems and achieve the same technical effects.
  • Those skilled in the art can clearly understand that, for the convenience and concise description, the specific working process of the touch terminal described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.
  • an embodiment of the present disclosure also provides an optical fingerprint identification method, which is applied to the above-mentioned optical fingerprint identification device, and includes:
  • Step S101 controlling the OLED display device to emit a light signal, wherein the light signal is reflected by a finger above the OLED display device to obtain reflected light;
  • Step S102 Make the reflected light pass through each microlens of the microlens layer, and respectively be directed to each aperture hole corresponding to each microlens on at least one aperture layer;
  • Step S103 the photosensitive sensing unit on the photosensitive sensor array receives the reflected light passing through the corresponding aperture to generate a fingerprint light sensing signal for fingerprint identification.
  • the terms “installed”, “connected”, and “connected” should be interpreted broadly, for example, they may be fixed connections or detachable connections. , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • installed should be interpreted broadly, for example, they may be fixed connections or detachable connections. , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • the optical fingerprint identification device is arranged under the OLED display device, and from the side close to the OLED display device, the optical fingerprint identification device goes from top to bottom
  • the bottom sequence includes: a microlens layer, at least one diaphragm layer, and a photosensitive sensor array; wherein the microlens layer includes a plurality of microlenses, the diaphragm layer includes a plurality of aperture holes, and the photosensitive sensor array includes a plurality of photosensitive sensor units
  • the microlens corresponds to the aperture hole one-to-one, and each microlens corresponds to one of the above-mentioned photosensitive sensor units, so that the light signal from the direction of the OLED display device after being reflected by the finger can pass through the microlens afterwards.
  • the aperture hole of at least one layer of the aperture layer so that the reflected light signal is limited by the aperture hole, and the angle of the reflected light signal is limited to a small angle range above it, so that the reflected light signal
  • the phenomenon of light crosstalk is reduced, thereby improving the imaging effect of the optical imaging structure.

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  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

La présente invention se rapporte au domaine technique des terminaux d'affichage et concerne un appareil d'identification optique d'empreintes digitales, un procédé d'identification optique d'empreintes digitales, et un terminal tactile. L'appareil d'identification optique d'empreintes digitales part du côté proche d'un dispositif d'affichage OLED et comprend, dans l'ordre de haut en bas : une couche de microlentilles, au moins une couche de diaphragme et un réseau de capteurs photosensibles ; la couche de microlentilles comprend une pluralité de microlentilles, la couche de diaphragme comprend une pluralité de trous de diaphragme, et le réseau de capteurs photosensibles comprend une pluralité d'unités de détection photosensibles ; les microlentilles et les trous de diaphragme correspondent un à un ; chaque microlentille correspond à une unité de détection photosensible ; et un signal lumineux provenant de la direction du dispositif d'affichage OLED qui est réfléchi par un doigt passe à travers les microlentilles, puis passe à travers les trous de diaphragme de la ou des couches de diaphragme, et est reçu par les unités de détection photosensibles. L'appareil d'identification optique d'empreintes digitales, le procédé d'identification optique d'empreintes digitales et le terminal tactile selon la présente invention limitent les angles de réception de lumière des signaux de lumière réfléchis au moyen des trous de diaphragme, ce qui peut empêcher la diaphonie de la détection de lumière par les unités de détection photosensibles et améliorer l'effet d'imagerie d'une structure d'imagerie optique.
PCT/CN2020/119491 2019-11-11 2020-09-30 Appareil d'identification optique d'empreintes digitales, procédé d'identification optique d'empreintes digitales et terminal tactile WO2021093487A1 (fr)

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CN112580579A (zh) * 2020-12-28 2021-03-30 上海菲戈恩微电子科技有限公司 一种光学生物识别模组的制造方法及电子设备
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CN115542435A (zh) * 2022-10-08 2022-12-30 珠海迈时光电科技有限公司 一种带背面光阑的微透镜列阵及其制备方法

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