WO2022147882A1 - 一种识别装置、识别方法及电子设备 - Google Patents

一种识别装置、识别方法及电子设备 Download PDF

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Publication number
WO2022147882A1
WO2022147882A1 PCT/CN2021/075584 CN2021075584W WO2022147882A1 WO 2022147882 A1 WO2022147882 A1 WO 2022147882A1 CN 2021075584 W CN2021075584 W CN 2021075584W WO 2022147882 A1 WO2022147882 A1 WO 2022147882A1
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WIPO (PCT)
Prior art keywords
layer
identification
light
identification device
electroluminescent
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Ceased
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PCT/CN2021/075584
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English (en)
French (fr)
Inventor
朱建锋
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Huizhou TCL Mobile Communication Co Ltd
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Huizhou TCL Mobile Communication Co Ltd
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Publication of WO2022147882A1 publication Critical patent/WO2022147882A1/zh
Priority to US18/347,601 priority Critical patent/US12142199B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; 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
    • G06V40/1341—Sensing with light passing through the finger
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present disclosure relates to the technical field of fingerprint identification and display, and in particular, to an identification device, an identification method, and an electronic device.
  • the purpose of the present disclosure is to provide an identification device, an identification method and an electronic device, aiming to solve the problem that the overall design of the display screen needs to be redesigned when the existing fingerprint module is implanted into the display screen of the mobile phone .
  • An identification device comprising:
  • the light-emitting panel is arranged on the identification layer;
  • the light-emitting panel when the object to be identified contacts the light-emitting panel, the light-emitting panel emits light, and the light emitted by the light-emitting panel is reflected by the object to be identified and then recognized by the identification layer.
  • the identification layer includes a sensing layer and a driving circuit connected to the sensing layer.
  • the material of the sensing layer is a photoelectric conversion material.
  • the photoelectric conversion material comprises III-V group element compound, single crystal silicon or organic perovskite material.
  • the identification device wherein the drive circuit comprises:
  • the transistor module is connected to the sensing layer
  • the pulse input terminal is connected with the transistor module
  • the signal output end is connected with the transistor module.
  • the identification device wherein the transistor module includes: a thin film transistor, the photoelectric conversion material is connected to the first node of the thin film transistor, the signal output terminal is connected to the second node of the thin film transistor, and the The pulse input terminal is connected to the third node of the thin film transistor.
  • the identification device further comprises: a display module, and the identification layer is arranged on the display module.
  • the aperture ratio of the thin film transistor is consistent with the pixel area of the display module.
  • identification layer further comprises:
  • analog-to-digital converter the analog-to-digital converter is connected to the signal output end;
  • the signal processor is connected to the analog-to-digital converter
  • the analog-to-digital converter converts the voltage signal received from the signal output end into a digital signal, and the signal processor processes the digital signal to obtain an identification result.
  • the light-emitting panel is an electroluminescent panel.
  • the identification device wherein the electroluminescent panel comprises:
  • the conductive substrate is disposed on the identification layer, and the conductive substrate has an electrode layer;
  • an electroluminescent layer which is arranged on the conductive substrate and connected to the electrode layer;
  • the cover plate is arranged on the electroluminescent layer.
  • the material of the electroluminescent layer includes indium phosphide or indium gallium arsenide phosphide.
  • the electroluminescent layer has a thickness of 10 nm to 1 ⁇ m.
  • the electrode layer is an anode electrode layer.
  • An identification device comprising:
  • the identification layer includes a sensing layer and a driving circuit connected to the sensing layer;
  • an electroluminescent panel the electroluminescent panel is disposed on the identification layer;
  • the electroluminescence panel when the object to be identified contacts the electroluminescence panel, the electroluminescence panel generates electroluminescence, and the light emitted by the electroluminescence panel is reflected by the object to be identified and then identified by the identification layer.
  • An identification method which is implemented by the identification device as described above, the identification method comprising:
  • the electroluminescent panel When the object to be identified contacts the electroluminescent panel, the electroluminescent panel emits a light beam;
  • the light beam is recognized by the recognition layer after being reflected by the object to be recognized.
  • An electronic device comprising the above-mentioned identification device.
  • the present disclosure provides an identification device, an identification method and an electronic device, the identification device includes: an identification layer, the identification layer includes a sensing layer and a driving circuit connected to the sensing layer; an electroluminescent panel, The electroluminescence panel is arranged on the identification layer; wherein, when the object to be identified presses the electroluminescence panel, the electroluminescence panel generates electroluminescence, and the light emitted by the electroluminescence panel passes through the The object to be recognized is recognized by the recognition layer after being reflected.
  • the electroluminescent panel and the object to be recognized can generate a weak electric field, so that the electroluminescent panel emits light, and the light emitted by the electroluminescent panel passes through the object to be recognized and the electroluminescent panel.
  • the partial reflection of the contact is detected by the identification layer, so that the object to be identified can be identified.
  • the identification device of the present disclosure does not need to redesign the structure of the touch display screen, but directly embeds the identification device into the display screen, which can also be performed without reducing the screen ratio. Fingerprint recognition.
  • FIG. 1 is a schematic structural diagram of an identification device of the present disclosure.
  • FIG. 2 is a schematic diagram of a light-emitting principle of an electroluminescent panel of an identification device of the present disclosure.
  • FIG. 3 is a schematic diagram of an identification principle of an identification device of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a driving circuit of an identification device of the present disclosure.
  • FIG. 5 is a fingerprint image obtained when an identification device of the present disclosure is used for fingerprint identification.
  • FIG. 6 is a schematic diagram of the arrangement of electrodes on a conductive substrate of an identification device of the present disclosure.
  • the present disclosure provides an identification device, an identification method, and an electronic device.
  • an identification device an identification method, and an electronic device.
  • the present disclosure will be described in further detail below. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, but not to limit the present disclosure.
  • the identification device includes: an identification layer 10 , the identification layer 10 includes a sensing layer 11 and a driving circuit 12 connected to the sensing layer 11 ; an electroluminescence panel 20 , the electroluminescence The panel 20 is arranged on the identification layer 10; wherein, when the object to be identified contacts the electroluminescence panel 20, the electroluminescence panel 20 generates electroluminescence, and the light emitted by the electroluminescence panel 20 passes through the The object to be recognized is recognized by the recognition layer 10 after being reflected.
  • the electroluminescent panel 20 is used to generate electroluminescence.
  • the principle of electroluminescence is to generate an electric field by applying a voltage to the two electrodes in the light-emitting center. When the voltage of the electric field reaches a threshold value, the electrons will be excited by the electric field, The electrons excited by the electric field are injected into the luminescent center, resulting in the transition, change, and recombination of electrons between energy levels, resulting in luminescence.
  • the electroluminescent panel is provided with electroluminescent material, and a weak electric field is applied to the electroluminescent material, which can make it generate electroluminescence and generate light.
  • the identification layer 10 is used for identifying the reflected light formed after the light emitted by the electroluminescent panel 20 is reflected by the object to be identified.
  • the electroluminescent panel 20 and the object to be identified can generate a weak electric field, and the electric quantity of the weak electric field must be sufficient to inject the excited electrons into the electroluminescent material, so that the electroluminescent panel 20 emits light, and the electroluminescent panel 20 emits light.
  • 20 is a transparent panel, so that the reflected light can penetrate the entire electroluminescent panel 20 to illuminate the identification layer 10, and the light emitted by the electroluminescent panel 20 is reflected by the identification layer 10 through the part of the object to be identified that is in contact with the electroluminescent panel 20.
  • the identification device of the present disclosure does not need to redesign the structure of the touch display screen in the touch display screen, but directly embeds the fingerprint identification device into the display screen, which can also be designed without reducing the screen ratio. Perform fingerprint recognition.
  • the identification device of this embodiment is mainly applied to fingerprint identification.
  • FIG. 2 and FIG. 3. Using the touch principle of the capacitive touch display screen, when a human finger touches the surface of the display screen, the human body is equivalent to grounding. There will be a certain amount of charge transferred to the human body, so that a weak electric field will be generated between the finger and the touch screen.
  • a weak electric field is generated between the electroluminescent panel 20 and the finger, and the weak electric field is sufficient for the electroluminescent panel to generate electroluminescence.
  • the pattern of a human fingerprint is composed of a plurality of raised parts a and concave parts b.
  • the raised part a on the finger will contact the surface of the cover plate 23, and the concave part on the finger will touch the surface of the cover plate 23.
  • b does not touch the cover plate 23
  • the electroluminescent panel 20 generates light, the light propagates towards the cover plate 23, part of the light beams propagating will contact the raised part of the finger, while the other part of the light beam will pass from the electroluminescent panel 20
  • the outgoing and entering air is refracted, and even if the refracted light is reflected by the recessed portion of the finger and re-enters the electroluminescent panel 20 , the intensity of the light finally entering the electroluminescent panel 20 is very weak.
  • the light beam contacted by the raised part a of the finger is blocked by the raised part a and cannot exit the cover plate 23 and is reflected, and after passing through the transparent electroluminescent panel 20, it is received by the photosensitive layer of the identification layer 10 and directed towards the finger's light beam.
  • the light beam of the concave part b is emitted into the air from the cover plate 23 and hardly reflected. This part of the light can hardly be reflected and is received by the identification layer 10. Therefore, the presence or absence or strength of the emitted light can identify the fingerprint of the finger.
  • the reflected light is converted and processed so that the fingerprint software can be recognized by the software.
  • the material of the sensing layer 11 is a photoelectric conversion material.
  • a photoelectric conversion material is a kind of energy conversion functional material that can convert light energy into electrical energy.
  • the valence band and conduction band of the electron transition have small forbidden band widths, and photons intervene in hole electrons, so that electrons are in the conduction band.
  • the layers form a flow of electrons.
  • the light reflected by the object to be identified is absorbed by the photoelectric conversion material in the sensing layer 11 through the transparent electroluminescent panel 20, and the light energy is converted into electrical energy through the photoelectric conversion material, that is, the optical signal is converted into an electrical signal.
  • the light is strong or weak, so the converted voltages are also different.
  • the photoelectric conversion material in the sensing layer 11 includes a plurality of mutually independent photoelectric conversion materials, and the plurality of mutually independent photoelectric conversion materials identify different positions of the object to be identified,
  • the specific size, quantity and arrangement of each photoelectric conversion material can be determined according to the shape of the object to be identified. For example, when the object to be recognized is a fingerprint, the raised part a and the recessed part b on the finger need to be recognized, and the size of the photoelectric conversion material can be designed to be smaller than the width and spacing of the fingerprint lines, so that the Information on the raised part a and the recessed part b of the finger.
  • Each photoelectric conversion material needs to be driven independently, so each photoelectric conversion material is connected to a driving circuit 12.
  • Different photoelectric conversion materials may not absorb light, and the intensity of the absorbed light may be different, so that the voltage output terminals of some driving circuits 12 may not absorb light. There is no voltage output, and the voltage values output by the voltage output terminals of some driving circuits 12 are different, so that a plurality of different electrical signals can be obtained. Since the raised part a of the finger can almost reflect all the light emitted by the electroluminescent panel 10, while the recessed part b of the finger can hardly reflect the light emitted by the electroluminescent panel 10, the photoelectric light under the raised part a of the finger can hardly reflect the light emitted by the electroluminescent panel 10.
  • the conversion material can absorb light, and the photoelectric conversion material that absorbs light can generate an electrical signal and output it, while the photoelectric conversion material under the recessed portion b of the finger hardly absorbs light, and the photoelectric conversion material that does not absorb light cannot generate electrical signals. Therefore, no electrical signal is generated and output.
  • the photoelectric conversion materials include but are not limited to III-V group element compounds, single crystal silicon or organic perovskite materials.
  • different photoelectric conversion materials have different photoelectric conversion properties, and selecting an appropriate photoelectric conversion material can improve the sensitivity of the sensing layer 11 .
  • the energy of the light irradiated on the photoelectric conversion material layer reaches the forbidden band width of the photoelectric conversion material, the electrons in the valence band of the photoelectric conversion material can transition, so that the carriers in the conduction band of the photoelectric conversion material increase, and then the photoelectric conversion material the current increases.
  • the light intensity is strong, more electrons can transition to the conduction band, and a larger current is generated; when the light intensity is weak, fewer electrons can transition to the conduction band, and the generated current is smaller.
  • the forbidden band width between the valence band and the conduction band of the photoelectric conversion material selected in the present disclosure is small. When the electrons are excited, the electrons can easily transition from the valence band to the conduction band, so that the detection range is large and the sensitivity is high. strong.
  • the present disclosure uses gallium arsenide as the photoelectric conversion material. Compared with other photoelectric conversion materials, the forbidden band width between the conduction band and the valence band of gallium arsenide is smaller, and receiving smaller light energy can make the The electrons on its valence band undergo transitions, thereby increasing the light intensity detection range of the photosensitive layer.
  • the driving circuit 12 includes: a transistor module 121, the transistor module 121 is connected to the sensing layer 11; a pulse input terminal 122, the pulse input terminal 122 is connected to the The transistor module 121 is connected; the signal output terminal 123 is connected to the transistor module 121 .
  • the pulse input terminal 122 is used for inputting electrical pulse signals, such as CMOS driving pulses.
  • An electrical pulse signal is input to the pulse input terminal 122 to open the thin film transistor switch in the transistor module 121 to form a path.
  • the photoelectric conversion material converts light energy into electrical energy and energizes the circuit, and the voltage output terminal outputs the converted voltage to obtain an electrical signal.
  • the transistor module 121 includes: a thin film transistor T, a first resistor R, a first capacitor C1 and a second capacitor C2, the photoelectric conversion material is connected to the first node of the thin film transistor T, and the signal output terminal 123 is connected to the second node of the thin film transistor T.
  • the node is connected, and the pulse input terminal 122 is connected to the third node of the thin film transistor T.
  • the first node may be a drain node or a source node
  • the second node may be a source node or a drain node
  • the third node may be a gate node.
  • One end of the first resistor R is connected to the second node of the thin film transistor T, the other end of the first resistor R is grounded, and the thin film transistor T and the first resistor R are connected in series.
  • the input driving pulse plays a role of voltage stabilization
  • the second capacitor C2 plays a role of voltage stabilization for the output voltage, thereby ensuring the circuit stability of the entire driving circuit 12 .
  • the driving circuit 12 in this embodiment is simple in design, and can also be designed to control the on and off of the driving circuit 12 through the switch of the thin film transistor T to control the on and off of the fingerprint recognition.
  • the identification device further includes: a display module 30 on which the identification layer 10 is disposed; the transistor module 121 includes a thin film transistor; the The aperture ratio of the thin film transistor is consistent with the pixel area of the display module 30 .
  • the identification device of this embodiment can be used for fingerprint identification under the screen of the display screen.
  • a display module 30 is arranged under the identification layer 10 , and the display module 30 is used for the screen display of the display screen.
  • the display screen of the display screen is formed by emitting light from each pixel. Since the identification layer is disposed on the display module, the thin film transistors on the driving circuit 12 may affect the display effect of the pixels on the display template.
  • the arrangement of the thin film transistors in the driving circuit 12 and the thin film The aperture ratio of the transistors is set so that the thin film transistors do not block the light emitted by the display module 30 from passing through the identification layer 10 , that is, the thin film transistors on the driving circuit 12 correspond to the pixels on the display module 30 one-to-one.
  • the number of thin film transistors is the same as the number of pixels of the display module 30, and the number of photoelectric conversion materials is the same as the number of pixels of the display module 30.
  • the width of the texture part of the fingerprint is usually larger than that of the display module 30
  • the pixel width of the screen so the number of photoelectric conversion materials and the number of pixels in the display module 30 will not affect the identification of fingerprints.
  • the aperture ratio of the thin film transistor needs to be the same as the area of the pixels in the display module 30. In this way, it can be ensured that the pixels of the display module 30 are not blocked by the thin film transistors.
  • the identification device of this embodiment when the identification device of this embodiment is applied to a touch display screen, since the light source used by the identification layer 10 of this embodiment to identify the object to be identified is the electroluminescent material on the upper layer rather than the light source from the display module 30 The display light source is displayed, so the present disclosure can be unlocked when the touch display screen is in a black state. When the touch display screen needs to be unlocked, a weak current will be generated between the finger and the touch display screen when a finger is placed on the touch display screen.
  • the electroluminescent material can generate light beams, so the touch screen can be directly unlocked when the touch screen is black, without making the touch screen glow, It saves the need to press the bright screen button or lift the touch screen and other operations that need to brighten the screen.
  • photoelectric conversion materials and electroluminescent materials can be arranged on the entire display screen, so that fingerprint recognition can be performed at any position of the display screen to unlock the screen without the need to display the unlocking position on the touch screen. Only the location can unlock the screen, which greatly facilitates the user's unlocking operation.
  • the identification layer 10 further includes: an analog-to-digital converter, the analog-to-digital converter is connected to the signal output end 123; a signal processor, the signal processor is connected to the analog-to-digital converter
  • the analog-to-digital converter converts the voltage signal received from the signal output terminal 123 into a digital signal, and the signal processor processes the digital signal to obtain an identification result.
  • an analog-to-digital converter is connected to the voltage output terminal.
  • the analog-to-digital converter is used to convert the electrical signal output from the voltage output terminal into a digital signal, which can be processed by software
  • the processing is performed so that the software can identify the signal.
  • the signal processor is used to process the digital signal processed by the analog-to-digital converter.
  • the signal processor receives the signals transmitted from different multiple driving circuits 12, and combines the positioning method of the touch screen to process the received different signals. processing to obtain the identification result.
  • the analog-to-digital converter converts the electrical signals transmitted from different multiple driving circuits 12 into multiple digital signals and then transmits them to the signal processor, and the signal processor processes the multiple digital signals.
  • the gray-scale value is represented by the gray-scale value.
  • the gray-scale value of the place where the signal is generated is larger, and the gray-scale value of the place that does not generate the signal is smaller.
  • each gray-scale value is spliced and processed to generate electricity. Where there is a signal, a pattern is formed, and where an electrical signal is not generated, there is no pattern, so that the fingerprint can be recognized and a fingerprint image is formed.
  • the electroluminescent panel 20 includes: a conductive substrate 21 , the conductive substrate 21 is disposed on the identification layer 10 , and an electrode layer is provided on the conductive substrate 21 ;
  • the electroluminescent layer 22 is provided on the conductive substrate 21 and is connected to the electrode layer; the cover plate 23 is provided on the electroluminescent layer 22 .
  • a layer of conductive substrate 21 is provided under the cover plate 23 , and the conductive substrate 21 has electrode wiring.
  • the diamond-shaped area in FIG. 6 is a transparent anode electrode, and the anode electrode material is usually Conductive materials such as indium tin oxide (ITO) are used.
  • ITO indium tin oxide
  • Electroluminescent materials excite electrons in the material through an electric field, and the transitions, changes, and recombination of electrons between energy levels lead to light emission.
  • an electroluminescent layer 22 is added between the cover plate 23 and the conductive anode substrate, the cover plate and the electroluminescent layer are connected by the adhesive layer 40, and the conductive substrate and the identification layer are also connected by the adhesive layer 40,
  • the adhesive layer 40 may be a transparent glue layer. Referring to FIG. 2, when the finger touches the cover plate 23, the electrode layer under the cover plate 23 touched by the finger is used as a touch electrode after scanning, and a pulse voltage is applied to the entire electrode layer. A weak electric field is generated.
  • the electrons When the electric field between the finger and the electrode is formed, the electrons will continue to be injected into the electroluminescent material, and the continuous electron injection to the hole region of the electroluminescent material forms a guiding current, and the photons of the luminescent material are absorbed by the electron energy.
  • the continuous injection leads to the energy transition of photons, the photons enter the conduction band layer of the luminescent material and are emitted in the form of light, thereby driving the electroluminescent material to emit light beams toward the upper glass cover plate 23 .
  • the identification layer 10 When the light beam touches the raised part a on the fingerprint of the finger, it will be reflected and received by the identification layer 10 , while other light beams are hardly reflected because they pass through the cover plate 23 and are directed to the air, even if they are reflected by the concave part b of the finger The light intensity will be greatly weakened when it is re-injected into the cover plate 23 . Therefore, according to whether the identification layer 10 receives the light and the intensity of the received light, the fingerprint path can be identified.
  • the material of the electroluminescent layer 22 includes indium phosphide or indium gallium arsenide phosphide, and the thickness of the electroluminescent layer is 10 nm ⁇ 1 ⁇ m, so that the electroluminescent material is a transparent material.
  • this embodiment also provides an identification method, which is implemented by the identification device described above, and the identification method includes:
  • the light beam is recognized by the recognition layer 10 after being reflected by the object to be recognized.
  • the identification method of this embodiment is implemented by the identification device as described above.
  • the identification device includes an identification layer 10 and an electroluminescent panel 20 disposed on the identification layer 10.
  • the electroluminescent panel 20 is a transparent panel, and the When the object touches the electroluminescent panel 20, the electroluminescent panel 20 and the object to be identified can generate a weak electric field, so that the electroluminescent panel 20 emits light, and the light emitted by the electroluminescent panel 20 passes through the object to be identified and the electroluminescence. Part of the reflection contacted by the panel 20 is detected by the identification layer 10, so that the object to be identified can be identified.
  • the identification method realized by the identification device of the present disclosure does not need to redesign the structure of the touch display screen in the touch display screen, but directly embeds the fingerprint identification device into the display screen, without reducing the screen ratio. Fingerprint recognition can also be performed under design conditions.
  • the identification method of this embodiment is mainly applied to fingerprint identification.
  • the convex part a on the finger will contact the surface of the cover plate 23 while the concave part b on the finger does not contact the cover plate 23 , the light beam generated by the electroluminescent panel 20 propagates toward the cover plate 23, and part of the light beam that propagates will contact the raised part of the finger, while another part of the light beam will be emitted from the electroluminescent panel 20 and enter the air for refraction, even if the refracted light is refracted.
  • the intensity of the light that is reflected by the recessed portion of the finger and re-enters the electroluminescent panel 20 is also very weak.
  • the light beam contacted by the raised part a of the finger is blocked by the raised part a and cannot exit the cover plate 23 and is reflected, passes through the transparent electroluminescent panel 20 and then is received by the identification layer 10 and shoots towards the recessed part b of the finger
  • the light beam is emitted from the cover plate 23 into the air, and almost no reflection occurs. This part of the light cannot be reflected and is received by the identification layer 10. Therefore, the raised part a of the fingerprint can be identified by the presence or strength of the emitted light. and the recessed part b.
  • step S10 specifically includes:
  • the weak electric field causes the electroluminescence layer 22 to generate electroluminescence, and the electroluminescence layer 22 emits a light beam.
  • Electroluminescent materials excite electrons in the material through an electric field, and the transitions, changes, and recombination of electrons between energy levels lead to light emission.
  • an electroluminescent layer 22 is added between the cover plate 23 and the conductive anode substrate. Please refer to FIG. 2 .
  • the electroluminescent material emits light beams toward the upper glass cover plate 23 .
  • the identification layer 10 When the light beam touches the raised part a on the fingerprint of the finger, it will be reflected and received by the identification layer 10 , while other light beams are hardly reflected because they pass through the cover plate 23 and are directed to the air, even if they are reflected by the concave part b of the finger The light intensity will be greatly weakened when it is re-injected into the cover plate 23 . Therefore, according to whether the identification layer 10 receives the light and the intensity of the received light, the fingerprint path can be identified.
  • step S20 includes:
  • the light beam propagates to the object to be identified, and is reflected by the object to be identified to form reflected light, and the reflected light is absorbed by the sensing layer 11;
  • the material of the sensing layer 11 is a photoelectric conversion material
  • the light reflected by the object to be identified is absorbed by the photoelectric conversion material in the sensing layer 11 through the transparent electroluminescent panel 20, and the light energy can be converted into electrical energy through the photoelectric conversion material , that is, the optical signal is converted into an electrical signal. Since the reflected light is strong or weak, the converted voltage is also different.
  • the photoelectric conversion material in the sensing layer 11 includes a plurality of mutually independent photoelectric conversion materials, and the plurality of mutually independent photoelectric conversion materials identify different positions of the object to be identified, The specific size, quantity and arrangement of each photoelectric conversion material need to be determined according to the object to be identified.
  • Each photoelectric conversion material needs to be driven independently, so each photoelectric conversion material is connected to a driving circuit 12. Different photoelectric conversion materials may not absorb light, and the intensity of the absorbed light may be different, so that the voltage output terminals of some driving circuits 12 may not absorb light. There is no voltage output, and the voltage values output by the voltage output terminals of some driving circuits 12 are different, so that a plurality of different electrical signals can be obtained.
  • an analog-to-digital converter is connected to each voltage output terminal.
  • the analog-to-digital converter is used to convert the electrical signal output from the voltage output terminal into a digital signal.
  • the signal processor is used to process the digital signal processed by the analog-to-digital converter.
  • the signal processor receives the signals transmitted from different multiple driving circuits 12, and combines the positioning method of the touch screen to process the received different signals. processing to obtain the identification result.
  • this embodiment further provides an electronic device, including the above-mentioned identification device.
  • the electronic device may be any device with a touch screen display, including a mobile phone terminal, a tablet computer, and a touch screen computer; the electronic device may also be a device with a touch function.
  • the present disclosure can be unlocked when the touch display screen of the electronic device is in a black state. When the touch display screen needs to be unlocked, a weak electric field will be generated between the finger and the touch display screen by placing a finger on the touch display screen.
  • the electroluminescent material can generate light beams, so the touch screen can be directly unlocked when the touch screen is black, without making the touch screen light, saving Go to the operation that needs to brighten the screen, such as pressing the bright screen button of the electronic device or lifting the electronic device.
  • photoelectric conversion materials and electroluminescent materials can be arranged on the entire touch screen, so that fingerprint recognition can be performed at any position of the touch screen to unlock the screen without the need to display the unlock position on the touch screen. , the screen can be unlocked only at the unlocking position, which greatly facilitates the unlocking operation of the user when using the electronic device.
  • the present disclosure provides an identification device, an identification method and an electronic device, the identification device includes: an identification layer, the identification layer includes a sensing layer and a driving circuit connected to the sensing layer; electroluminescence The electroluminescent panel is arranged on the identification layer; wherein, when the object to be identified presses the electroluminescent panel, the electroluminescent panel emits electroluminescence, and the electroluminescent panel emits The light is recognized by the recognition layer after being reflected by the object to be recognized.
  • the electroluminescent panel and the object to be recognized can generate a weak electric field, so that the electroluminescent panel emits light, and the light emitted by the electroluminescent panel passes through the object to be recognized and the electroluminescent panel.
  • the partial reflection of the contact is detected by the identification layer, so that the object to be identified can be identified.
  • the identification device of the present disclosure does not need to redesign the structure of the touch display screen in the touch display screen, but directly embeds the fingerprint identification device into the display screen, which can also be designed without reducing the screen ratio. Perform fingerprint recognition.

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Abstract

本公开公开了一种识别装置、识别方法及电子设备，所述识别装置包括：识别层，所述识别层包括感应层以及与所述感应层连接的驱动电路；电致发光面板，所述电致发光面板设置在所述识别层上；其中，当待识别物按压所述电致发光面板时，所述电致发光面板发生电致发光，所述电致发光面板发出的光经所述待识别物反射后被所述识别层识别。本公开的识别装置在触控显示屏中，不需要对触控显示屏的结构进行重新设计，而是直接把指纹识别装置嵌入到显示屏中，在不减少屏占比的设计条件下同样能够进行手指指纹识别。

Description

一种识别装置、识别方法及电子设备
优先权
所述PCT专利申请要求申请日为2020年1月7日，申请号为202110019111.7的中国专利优先权，本专利申请结合了上述专利的技术方案。
技术领域
本公开涉及指纹识别显示技术领域，尤其涉及一种识别装置、识别方法及电子设备。
背景技术
随着指纹识别在手机中的应用的推广，越来越多的需要进行指纹识别的电子设备中都开始植入指纹模组。但是在指纹模组植入的过程中，手机的结构势必要留出空间安放指纹模组块，需要对手机显示屏的结构重新进行设计，给手机的整体设计带来不可阻扰的变化，尤其在目前追求高屏占比的条件下，对显示屏的设计要求更高。
因此，现有技术还有待于改进和发展。
发明内容
鉴于上述现有技术的不足，本公开的目的在于提供一种识别装置、识别方法及电子设备，旨在解决现有的指纹模组植入手机显示屏时需要重新对显示屏进行整体设计的问题。
本公开的技术方案如下：
一种识别装置，其中，包括：
识别层；
发光面板，所述发光面板设置在所述识别层上；
其中，当待识别物接触所述发光面板时，所述发光面板发光，所述发光面板发出的光经所述待识别物反射后被所述识别层识别。
所述的识别装置，其中，所述识别层包括感应层以及与所述感应层连接的驱动电路。
所述的识别装置，其中，所述感应层的材料为光电转换材料。
所述的识别装置，其中，所述光电转换材料包括Ⅲ-Ⅴ族元素化合物、单晶硅或有机钙钛矿材料。
所述的识别装置，其中，所述驱动电路包括：
晶体管模块，所述晶体管模块与所述感应层连接；
脉冲输入端，所述脉冲输入端与所述晶体管模块连接；
信号输出端，所述信号输出端与所述晶体管模块连接。
所述的识别装置，其中，所述晶体管模块包括：薄膜晶体管，所述光电转换材料与所述薄膜晶体管的第一节点连接，所述信号输出端与所述薄膜晶体管的第二节点连接，所述脉冲输入端与所述薄膜晶体管的第三节点连接。
所述的识别装置，其中，还包括：显示模组，所述识别层设置在所述显示模组上。
所述的识别装置，其中，所述薄膜晶体管的开口率与所述显示模组的像素面积一致。
所述的识别装置，其中，所述识别层还包括：
模数转换器，所述模数转换器与所述信号输出端连接；
信号处理器，所述信号处理器与所述模数转换器连接；
其中，所述模数转换器将从所述信号输出端接收的电压信号转换成数字信号，所述信号处理器对所述数字信号进行处理得到识别结果。
所述的识别装置，其中，所述发光面板为电致发光面板。
所述的识别装置，其中，所述电致发光面板包括：
导电基板，所述导电基板设置在所述识别层上，所述导电基板上具有电极层；
电致发光层，所述电致发光层设置在所述导电基板上，并与电极层连接；
盖板，所述盖板设置在所述电致发光层上。
所述的识别装置，其中，所述电致发光层的材料包括磷化铟或磷砷化镓铟。
所述的识别装置，其中，所述电致发光层的厚度为10nm～1μm。
所述的识别装置，其中，所述电极层为阳极电极层。
一种识别装置，其中，包括：
识别层，所述识别层包括感应层以及与所述感应层连接的驱动电路；
电致发光面板，所述电致发光面板设置在所述识别层上；
其中，当待识别物接触所述电致发光面板时，所述电致发光面板发生电致发光，所述电致发光面板发出的光经所述待识别物反射后被所述识别层识别。
一种识别方法，其中，采用如如上所述的识别装置实现，所述识别方法包括：
当待识别物接触到电致发光面板时，所述电致发光面板发出光束；
所述光束经所述待识别物反射后被识别层识别。
一种电子设备，其中，包括如上所述的识别装置。
有益效果：本公开提供了一种识别装置、识别方法及电子设备，所述识别装置包括：识别层，所述识别层包括感应层以及与所述感应层连接的驱动电路；电致发光面板，所述电致发光面板设置在所述识别层上；其中，当待识别物按压所述电致发光面板时，所述电致发光面板发生电致发光，所述电致发光面板发出的光经所述待识别物反射后被所述识别层识别。通过待识别物对电致发光面板的触控，电致发光面板与待识别物能够产生一个弱电场，使电致发光面板发光，电致发光面板发出的光经待识别物与电致发光面板接触的部分反射被识别层检测到，从而能够识别待识别物。本公开的识别装置在触控显示屏中，不需要对触控显示屏的结构进行重新设计，而是直接把识别装置嵌入到显示屏中，在不减少屏占比的设计条件下同样能够进行手指指纹识别。
附图说明
图1为本公开的一种识别装置的结构示意图。
图2为本公开的一种识别装置的电致发光面板的发光原理示意图。
图3为本公开的一种识别装置的识别原理示意图。
图4为本公开的一种识别装置的驱动电路的结构示意图。
图5为本公开的一种识别装置的用于指纹识别时得到的指纹图
图6为本公开的一种识别装置的导电基板上的电极排布示意图。
具体实施方式
本公开提供一种识别装置、识别方法及电子设备，为使本公开的目的、技术方案及效果更加清楚、明确，以下对本公开进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本公开，并不用于限定本公开。
现有的手机显示屏的指纹识别通常要植入指纹模组，而指纹模组的植入要对手机显示屏的结构带来不可阻扰的变化，本实施例提供了一种识别装置，请参见图1至图4，所述识别装置包括：识别层10，所述识别层10包括感应层11以及与所述感应层11连接的驱动电路12；电致发光面板20，所述电致发光面板20设置在所述识别层10上；其中，当待识别物接触所述电致发光面板20时，所述电致发光面板20发生电致发光，所述电致发光面板20发出的光经所述待识别物反射后被所述识别层10识别。
具体地，电致发光面板20用于发生电致发光，电致发光的原理是通过在发光中心的两电极加电压而产生一个电场，当电场的电压达到一个阈值时，电子会被电场激发，被电场激发的电子注入发光中心，导致电子在能级间的跃迁、变化、复合导致发光。电致发光面板中设有电致发光材料，对电致发光材料的加上一个弱电场，可以使其产生电致发光现象，产生光。识别层10是用于对电致发光面板20发出的光被待识别物反射后形成的反射光进行识别。本实施例中使电致发光面板20与待识别物能够产生一个弱电场，这个弱电场的电量要足够将被激发的电子注入电致发光材料，使电致发光面板20发光，电致发光面板20为透明面板，从而能使反射光穿透整个电致发光面板20照射到识别层10，电致发光面板20发出的光经待识别物与电致发光面板20接触的部分反射被识别层10检测到，从而能够识别待识别物。本公开的识别装置在触控显示屏中，不需要对触控显示屏的结构进行重新设计，而是直接把指纹识别装置嵌入到显示屏中，在不减少屏占比的设计条件下同样能够进行手指指纹识别。
进一步，本实施例的识别装置主要应用于指纹识别，请参见图2和图3，利用电容式触控显示屏的触控原理，当人的手指触摸到显示屏表面时，人体相当于接地，会有一定数量的电荷转移到人体上面来，从而手指与触摸显示屏之间会产生一个弱电场。本实施例中，通过手指对电致发光面板20的触控，电致发光面板20与手指之间产生弱电场，该弱电场足够使电致发光面板产生电致发光。人的手指指纹的纹路是由多个凸起部分a和凹陷部分b构成，当手指接触到盖板23时，手指上的凸起部分a会接触到盖板23的表面而手指上的凹陷部分b未接触到盖板23，电致发光面板20产生光后，光向盖板23方向传播，传播的光束一部分会与手指凸起的部分接触，而另一部分光束会从电致发光面板20中射出并进入空气发生折射，即使折射光被手指的凹陷部反射重新进入电致发光面板20，最终进入电致发光面板20的光的强度也是非常弱。手指的凸起部分a接触的光束由于被凸起部分a挡住而不能射出盖板23而发生反射，并穿过透明的电致发光面板20后被识别层10的感光层接收，射向手指的凹陷部分b的光束从盖板23射入空气中，几乎不发生反射，这部分光几乎不能被反射并被识别层10接收，因此通过发射光的有无或强弱，可以识别出手指指纹的凸起部分a和凹陷部分b，感光层接收反射光后，对反射光进行转化和处理使指纹软件能够被软件识别。
在一种实施方式中，所述感应层11的材料为光电转换材料。
具体地，光电转换材料是一种能把光能转变为电能的一类能量转换功能材料，其电子跃迁的价带和导带的禁带宽度小，光子介入空穴电子，使电子处于导带层形成电子流。 经待识别物反射的光经过透明的电致发光面板20被感应层11中的光电转换材料吸收，通过光电转换材料将光能转化为电能，也就是将光信号转化为电信号，由于反射的光有强有弱，因此转化的电压大小也不相同，通过对驱动电路12输出电压大小不同的电信号进行处理，从而能够对待识别物进行识别。进一步，由于需要对待识别物不同的形貌进行识别，因此感应层11中的光电转换材料包括多个相互独立的光电转换材料，多个相互独立的光电转换材料对待识别物不同的位置进行识别，具体的每个光电转换材料的尺寸、数量以及排布方式需要可根据待识别物的形貌进行确定。举例来说，当待识别物是手指指纹时，需要识别出的是手指上的凸起部分a和凹陷部分b，可以将光电转换材料的尺寸设计成小于指纹纹路的宽度和间距，从而可以获取手指的凸起部分a和凹陷部分b的信息。每个光电转换材料需要独立驱动，因此每个光电转换材料与一个驱动电路12连接，不同的光电转换材料可能没有吸收光，可能吸收的光的强度大小不同，从而有些驱动电路12的电压输出端没有电压输出，有些驱动电路12的电压输出端输出的电压值不相同，从而可以得到多个不同的电信号。由于手指的凸起部分a几乎能够将电致发光面板10发出的光全部反射，而手指的凹陷部分b几乎不能将电致发光面板10发出的光反射，因而在手指凸起部分a下的光电转换材料能够吸收到光，吸收到光的光电转换材料能够产生电信号并输出，而手指凹陷部分b下的光电转换材料几乎没有吸收到光，没有吸收到光的光电转换材料不能产生电信号，因此不会产生电信号并输出。
进一步，所述光电转换材料包括但不限于Ⅲ-Ⅴ族元素化合物、单晶硅或有机钙钛矿材料。
具体地，不同的光电转换材料的光电转换性能不同，选择合适的光电转换材料能够提高感应层11的敏感性。当光照射到光电转换材料层上的能量达到光电转换材料的禁带宽度时，才能使光电转换材料的价带上的电子发生跃迁，从而其导带上的载流子增加，进而光电转换材料的电流增加。而当光的强度较强时，较多的电子能够跃迁至导带，则产生的电流较大；当光的强度较弱时，较少的电子能够跃迁至导带，则产生的电流较小。本公开选用的光电转换材料的价带和导带之间的禁带宽度较小，当电子受激发时，电子较容易就能从价带跃迁到导带上，从而检测范围较大，敏感性较强。优选的，本公开采用砷化镓作为光电转换材料，相较于其他的光电转换材料，砷化镓的导带与价带之间的禁带宽度更小，接收较小的光能都能使其价带上的电子发生跃迁，从而增加了感光层的光强检测范围。
在一种实施方式中，请参见图4，所述驱动电路12包括：晶体管模块121，所述晶体管模块121与所述感应层11连接；脉冲输入端122，所述脉冲输入端122与所述晶体管模块121连接；信号输出端123，所述信号输出端123与所述晶体管模块121连接。
具体地，对于每一个驱动电路12，脉冲输入端122是用于输入电脉冲信号，如CMOS驱动脉冲。在脉冲输入端122输入一电脉冲信号以打开晶体管模块121中的薄膜晶体管开关，形成通路。光电转换材料将光能转换成电能并使电路通电，电压输出端将转换的电压进行输出，得到电信号。进一步，晶体管模块121包括：薄膜晶体管T、第一电阻R、第一电容C1以及第二电容C2，光电转换材料与薄膜晶体管T的第一节点连接，信号出端123与薄膜晶体管T的第二节点连接，脉冲输入端122与薄膜晶体管T的第三节点连接。第一节点可以是漏极节点或源极节点，第二节点可以是源极节点或漏极节点，第三节点可以是栅极节点。第一电阻R的一端与薄膜晶体管T的第二节点连接，第一电阻R的另一端接地，薄膜晶体管T与第一电阻R串联。同时，第一电容C1的一端与脉冲输入端122连接，第一电容C1的另一端接地，第二电容C2的一端与电压输出端连接，第二电容C2的另一端接地，第一电容C1对输入的驱动脉冲起到稳压的作用，第二电容C2对输出电压起到稳压作用，从而保证了整个驱动电路12的电路稳定性。本实施例的驱动电路12设计简单，也可以设计成通过薄膜晶体管T的开关控制驱动电路12的导通与断开，对指纹识别的开启与关闭进行控制。
在一种实现方式中，请参见图1，所述识别装置还包括：显示模组30，所述识别层10设置在所述显示模组30上；所述晶体管模块121包括薄膜晶体管；所述薄膜晶体管的开口率与所述显示模组30的像素面积一致。
具体地，本实施例的识别装置可以用于显示屏的屏下指纹识别，在识别层10下方设置显示模组30，显示模组30是用于显示屏的画面显示，显示模组30上布设有多个像素点，显示屏的显示画面是通过每个像素点发光而形成。由于识别层是设置在显示模组上，驱动电路12上的薄膜晶体管可能会影响显示模板上的像素的显示效果，为了不影响显示屏的显示效果，薄膜晶体管在驱动电路12中的布设以及薄膜晶体管的开口率设置要使薄膜晶体管的不阻挡显示模组30的发出的光透过识别层10，也就是说，驱动电路12上的薄膜晶体管与显示模组30上的像素点一一对应，换句话说，薄膜晶体管的数量与显示模组30的像素点的数量一样，则光电转换材料的数量与显示模组30的像素点的数量一样，而由于指纹的纹路部分的宽度通常是大于显示屏的像素宽度，因此将光电转换材料的数量与显示模组30的像素点的数量一样不会影响对指纹的识别，同时薄膜 晶体管的的开口率需与显示模组30中的像素点的面积一致，这样可以保证显示模组30的像素点不被薄膜晶体管遮挡。
进一步，本实施例的识别装置应用于触控显示屏中时，由于本实施例的识别层10识别待识别物所利用的光源是其上层的电致发光材料而不是来自显示模组30中的显示光源，因此本公开能够在触控显示屏是黑屏状态时进行解锁，在需要解锁触控显示屏时，将手指放在触控显示屏上，手指与触控显示屏之间会产生一个弱电场，只要手指与电极层建立起电场，电致发光材料就能够产生光束，因此可以在触控显示屏黑屏的情况下直接对触控显示屏进行解锁，而不需要使触控显示屏发光，省去了要按亮屏按键或者要将触控显示屏抬起等需要亮屏的操作。并且，光电转换材料和电致发光材料可以在整个显示屏上布设，从而可以在显示屏的任意位置进行指纹识别从而进行屏幕解锁操作，而不需要触控显示屏上显示解锁位置，在该解锁位置才能解锁屏幕，大大方便了用户的解锁操作。
在一种实现方式中，所述识别层10还包括：模数转换器，所述模数转换器与所述信号输出端123连接；信号处理器，所述信号处理器与所述模数转换器连接；其中，所述模数转换器将从所述信号输出端123接收的电压信号转换成数字信号，所述信号处理器对所述数字信号进行处理得到识别结果。
具体地，由于电信号不能直接被软件进行处理，因此在电压输出端连接一个模数转换器，模数转换器是用于将电压输出端输出的电信号转换为数字信号，数字信号能够被软件进行处理从而使软件能够对信号进行识别。信号处理器用于对经模数转换器处理得到的数字信号进行处理，信号处理器接收到来自不同的多个驱动电路12传送过来的信号，结合触控屏的定位方式对接收到的不同信号进行处理，得到识别结果。对于指纹识别，请参见图5，模数转换器将来自不同的多个驱动电路12传送过来的电信号转换成多个数字信号后传送至信号处理器，信号处理器将多个数字信号进行处理并用灰阶值表示，产生信号的地方灰阶值较大，而不产生信号的地方灰阶值较小，再结合电容式触控屏的定位方式对各个灰阶值进行拼接处理，从而产生电信号的地方形成纹路，而不产生电信号的地方则没有出现纹路，进而指纹能够被识别并形成指纹图像。
在一种实现方式中，请参见图1，所述电致发光面板20包括：导电基板21，所述导电基板21设置在所述识别层10上，所述导电基板21上具有电极层；电致发光层22，所述电致发光层22设置在所述导电基板21上，并与电极层连接；盖板23，所述盖板23设置在所述电致发光层22上。
具体地，请参见图6，常见的电容触控面板是在盖板23下设置一层导电基板21，导电基板21具有电极布线，图6中的菱形区域为透明的阳极电极，阳极电极材料常采用如氧化铟锡(ITO)导电材料。当手指触碰盖板23时，电极层与手指能够建立一个弱电场，以识别手指在触控显示屏上的实际触控位置。电致发光材料是通过电场激发材料中的电子，电子在能级间的跃迁、变化、复合导致发光。本实施例是在盖板23与导电阳极基板之间增加一层电致发光层22，盖板与电致发光层通过粘结层40连接，导电基板与识别层也是通过粘结层40连接，粘结层40可以是透明的胶水层。请参见图2，当手指接触盖板23时，手指接触的盖板23下方的电极层作为触控电极扫描结束后，给整个电极层一个脉冲电压，由于人体类似接地，电极层与手指之间产生一个弱电场，当手指与电极之间的电场形成后，电子会持续注入电致发光材料，持续的电子注入给电致发光材料的空穴区形成导向电流，发光材料的光子被电子能量的持续注入导致发生光子的能量跃迁，光子进入发光材料的导带层并以光的形式发射出去，从而驱动电致发光材料向上层的玻璃盖板23方向发射光束。当光束接触到手指指纹上的凸起部分a时，会发生反射并被识别层10接收，而其他光束由于透过盖板23射向空气，几乎不发生反射，即使通过手指的凹陷部分b反射重新射入盖板23，其光强也会被大大削弱，因此，根据识别层10是否接收到的光以及接收到的光的强度大小，可以识别出手指纹路。进一步，所述电致发光层22的材料包括磷化铟或磷砷化镓铟，电致发光层的厚度为10nm～1μm，以使电致发光材料为透明材料。
在一种实现方式中，本实施例还提供了一种识别方法，采用如上所述的识别装置实现，所述识别方法包括：
S10、当待识别物接触到电致发光面板20时，所述电致发光面板20发出光束；
S20、所述光束经所述待识别物反射后被识别层10识别。
具体地，本实施例的识别方法采用如上所述的识别装置实现，识别装置包括识别层10和设置在识别层10上的电致发光面板20，电致发光面板20为透明面板，通过待识别物对电致发光面板20的触控，电致发光面板20与待识别物能够产生一个弱电场，使电致发光面板20发光，电致发光面板20发出的光经待识别物与电致发光面板20接触的部分反射被识别层10检测到，从而能够识别待识别物。采用本公开的识别装置实现的识别方法在触控显示屏中，不需要对触控显示屏的结构进行重新设计，而是直接把指纹识别装置嵌入到显示屏中，在不减少屏占比的设计条件下同样能够进行手指指纹识别。
本实施例的识别方法主要应用于指纹识别中，当手指接触到盖板23时，手指上的凸起部分a会接触到盖板23的表面而手指上的凹陷部分b未接触到盖板23，电致发光面板20产生光束向盖板23方向传播，传播的光束一部分会与手指凸起的部分接触，而另一部分光束会从电致发光面板20中射出并进入空气发生折射，即使折射光被手指的凹陷部反射重新进入电致发光面板20，最终进入电致发光面板20的光的强度也是非常弱。手指的凸起部分a接触的光束由于被凸起部分a挡住而不能射出盖板23而发生反射，并穿过透明的电致发光面板20后被识别层10接收，射向手指的凹陷部分b的光束从盖板23射入空气中，几乎不发生反射，这部分光不能被反射并被识别层10接收，因此通过发射光的有无或强弱，可以识别出手指指纹的凸起部分a和凹陷部分b。
进一步，步骤S10具体包括：
S11、当待识别物接触到盖板23时，待识别物与导电基板21产生弱电场；
S12、所述弱电场使所述电致发光层22产生电致发光，所述电致发光层22发出光束。
具体地，当手指触碰盖板23时，电极层与手指能够建立一个弱电场，以识别手指在触控显示屏上的实际触控位置。电致发光材料是通过电场激发材料中的电子，电子在能级间的跃迁、变化、复合导致发光。本实施例是在盖板23与导电阳极基板之间增加一层电致发光层22，请参见图2，当手指接触盖板23时，手指接触的盖板23下方的电极层作为触控电极扫描结束后，给整个电极层一个脉冲电压，由于人体类似接地，电极层与手指之间产生一个弱电场，当手指与电极之间的电场形成后，电子会持续注入电致发光材料，持续的电子注入给电致发光材料的空穴区形成导向电流，发光材料的光子被电子能量的持续注入导致发生光子的能量跃迁，光子进入发光材料的导带层并以光的形式发射出去，从而驱动电致发光材料向上层的玻璃盖板23方向发射光束。当光束接触到手指指纹上的凸起部分a时，会发生反射并被识别层10接收，而其他光束由于透过盖板23射向空气，几乎不发生反射，即使通过手指的凹陷部分b反射重新射入盖板23，其光强也会被大大削弱，因此，根据识别层10是否接收到的光以及接收到的光的强度大小，可以识别出手指纹路。
进一步，步骤S20包括：
S21、所述光束传播至所述待识别物，并被所述待识别物反射形成反射光，所述反射光被所述感应层11吸收；
S22、通过所述感应层11将所述反射光转化成电信号；
S23、通过数模转换器将所述电信号转换成数字信号；
S24、通过信号处理器将所述数字信号进行处理，得到识别结果。
具体地，感应层11的材料为光电转换材料，经待识别物反射的光经过透明的电致发光面板20被感应层11中的光电转换材料吸收，通过光电转换材料可以将光能转化为电能，也就是将光信号转化为电信号，由于反射的光有强有弱，因此转化的电压大小也不相同。
进一步，由于需要对待识别物不同的形貌进行识别，因此感应层11中的光电转换材料包括多个相互独立的光电转换材料，多个相互独立的光电转换材料对待识别物不同的位置进行识别，具体的每个光电转换材料的尺寸、数量以及排布方式需要根据待识别物进行确定。每个光电转换材料需要独立驱动，因此每个光电转换材料与一个驱动电路12连接，不同的光电转换材料可能没有吸收光，可能吸收的光的强度大小不同，从而有些驱动电路12的电压输出端没有电压输出，有些驱动电路12的电压输出端输出的电压值不相同，从而可以得到多个不同的电信号。
更进一步，由于电信号不能直接被软件进行处理，因此在每个电压输出端连接一个模数转换器，模数转换器是用于将电压输出端输出的电信号转换为数字信号，数字信号能够被软件进行处理从而使软件能够对信号进行识别。信号处理器用于对经模数转换器处理得到的数字信号进行处理，信号处理器接收到来自不同的多个驱动电路12传送过来的信号，结合触控屏的定位方式对接收到的不同信号进行处理，得到识别结果。
在一种实现方式中，本实施例还提供了一种电子设备，包括如上所述的识别装置。
具体的，电子设备可以是任何具有触控显示屏的设备，包括手机终端、平板电脑、触屏电脑；电子设备也可以是具有触控功能的装置。本公开能够在电子设备的触控显示屏是黑屏状态时进行解锁，在需要解锁触控显示屏时，将手指放在触控显示屏上，手指与触控显示屏之间会产生一个弱电场，只要手指与电极层建立起电场，电致发光材料就能够产生光束，因此可以在触控显示屏黑屏的情况下直接对触控显示屏进行解锁，而不需要使触控显示屏发光，省去了要按电子设备的亮屏按键或者要将电子设备抬起等需要亮屏的操作。并且，光电转换材料和电致发光材料可以在整个触控显示屏上布设，从而可以在触控显示屏的任意位置进行指纹识别从而进行屏幕解锁操作，而不需要触控显示屏上显示解锁位置，在该解锁位置才能解锁屏幕，大大方便了用户在使用电子设备时的解锁操作。
综上所述，本公开提供了一种识别装置、识别方法及电子设备，所述识别装置包括： 识别层，所述识别层包括感应层以及与所述感应层连接的驱动电路；电致发光面板，所述电致发光面板设置在所述识别层上；其中，当待识别物按压所述电致发光面板时，所述电致发光面板发生电致发光，所述电致发光面板发出的光经所述待识别物反射后被所述识别层识别。通过待识别物对电致发光面板的触控，电致发光面板与待识别物能够产生一个弱电场，使电致发光面板发光，电致发光面板发出的光经待识别物与电致发光面板接触的部分反射被识别层检测到，从而能够识别待识别物。本公开的识别装置在触控显示屏中，不需要对触控显示屏的结构进行重新设计，而是直接把指纹识别装置嵌入到显示屏中，在不减少屏占比的设计条件下同样能够进行手指指纹识别。
应当理解的是，本公开的应用不限于上述的举例，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，所有这些改进和变换都应属于本公开所附权利要求的保护范围。

Claims (17)

  1. 一种识别装置，其特征在于，包括：
    识别层，所述识别层包括感应层以及与所述感应层连接的驱动电路；
    电致发光面板，所述电致发光面板设置在所述识别层上；
    其中，当待识别物接触所述电致发光面板时，所述电致发光面板发生电致发光，所述电致发光面板发出的光经所述待识别物反射后被所述识别层识别；
    所述感应层的材料为光电转换材料；所述待识别物为指纹；所述电致发光面板包括：
    导电基板，所述导电基板设置在所述识别层上，所述导电基板上具有电极层；
    电致发光层，所述电致发光层设置在所述导电基板上，并与所述电极层连接；
    盖板，所述盖板设置在所述电致发光层上。
  2. 一种识别装置，其特征在于，包括：
    识别层；
    发光面板，所述发光面板设置在所述识别层上；
    其中，当待识别物接触所述发光面板时，所述发光面板发光，所述发光面板发出的光经所述待识别物反射后被所述识别层识别。
  3. 根据权利要求2所述的识别装置，其特征在于，所述识别层包括感应层以及与所述感应层连接的驱动电路。
  4. 根据权利要求3所述的识别装置，其特征在于，所述感应层的材料为光电转换材料。
  5. 根据权利要求4所述的识别装置，其特征在于，所述光电转换材料包括Ⅲ-Ⅴ族元素化合物、单晶硅或有机钙钛矿材料。
  6. 根据权利要求4所述的识别装置，其特征在于，所述驱动电路包括：
    晶体管模块，所述晶体管模块与所述感应层连接；
    脉冲输入端，所述脉冲输入端与所述晶体管模块连接；
    信号输出端，所述信号输出端与所述晶体管模块连接。
  7. 根据权利要求6所述的识别装置，其特征在于，所述晶体管模块包括：薄膜晶体管；所述光电转换材料与所述薄膜晶体管的第一节点连接，所述信号输出端与所述薄膜晶体管的第二节点连接，所述脉冲输入端与所述薄膜晶体管的第三节点连接。
  8. 根据权利要求7所述的识别装置，其特征在于，还包括：显示模组，所述识别层设置在所述显示模组上。
  9. 根据权利要求8所述的识别装置，其特征在于，所述薄膜晶体管的开口率与所述显示模组的像素面积一致。
  10. 根据权利要求6所述的识别装置，其特征在于，所述识别层还包括：
    模数转换器，所述模数转换器与所述信号输出端连接；
    信号处理器，所述信号处理器与所述模数转换器连接；
    其中，所述模数转换器将从所述信号输出端接收的电压信号转换成数字信号，所述信号处理器对所述数字信号进行处理得到识别结果。
  11. 根据权利要求2所述的识别装置，其特征在于，所述发光面板为电致发光面板。
  12. 根据权利要求11所述的识别装置，其特征在于，所述电致发光面板包括：
    导电基板，所述导电基板设置在所述识别层上，所述导电基板上具有电极层；
    电致发光层，所述电致发光层设置在所述导电基板上，并与电极层连接；
    盖板，所述盖板设置在所述电致发光层上。
  13. 根据权利要求12所述的识别装置，其特征在于，所述电致发光层的材料包括磷化铟或磷砷化镓铟。
  14. 根据权利要求12所述的识别装置，其特征在于，所述电致发光层的厚度为10nm～1μm。
  15. 根据权利要求12所述的识别装置，其特征在于，所述电极层为阳极电极层。
  16. 一种识别方法，其特征在于，采用如权利要求1-15任意一项所述的识别装置实现，所述识别方法包括：
    当待识别物接触到电致发光面板时，所述电致发光面板发出光束；
    所述光束经所述待识别物反射后被识别层识别。
  17. 一种电子设备，其特征在于，包括如权利要求1-15任意一项所述的识别装置。
PCT/CN2021/075584 2021-01-07 2021-02-05 一种识别装置、识别方法及电子设备 Ceased WO2022147882A1 (zh)

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