WO2017188715A2 - 언더글라스 적용이 가능한 발광 지문 인식 패널 및 이를 포함하는 지문 인식 디스플레이 장치 - Google Patents

언더글라스 적용이 가능한 발광 지문 인식 패널 및 이를 포함하는 지문 인식 디스플레이 장치 Download PDF

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Publication number
WO2017188715A2
WO2017188715A2 PCT/KR2017/004407 KR2017004407W WO2017188715A2 WO 2017188715 A2 WO2017188715 A2 WO 2017188715A2 KR 2017004407 W KR2017004407 W KR 2017004407W WO 2017188715 A2 WO2017188715 A2 WO 2017188715A2
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WIPO (PCT)
Prior art keywords
light
unit
light emitting
fingerprint recognition
receiving
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PCT/KR2017/004407
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English (en)
French (fr)
Korean (ko)
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WO2017188715A3 (ko
Inventor
김종욱
김재흥
전호식
최우영
윤주안
이준석
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크루셜텍 (주)
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Priority to CN201780002325.5A priority Critical patent/CN108604296B/zh
Publication of WO2017188715A2 publication Critical patent/WO2017188715A2/ko
Publication of WO2017188715A3 publication Critical patent/WO2017188715A3/ko

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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
    • 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]
    • G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix

Definitions

  • the present invention relates to a flat fingerprint image scanning device, and a fingerprint recognition panel capable of scanning a fingerprint image on a display screen having the same, and a display device including the same.
  • the mainstream of the fingerprint sensor applied to portable information communication devices is a semiconductor wafer-based capacitive fingerprint sensor. Since the fingerprint sensor of this type is opaque at first, it has been installed in a home key, a side key or a rear key. However, when installed in such a part, there is a limit in securing a sufficient area for accurate and convenient utilization of the fingerprint recognition sensor. In addition, the location is limited, which also limits the convenience of the user. In addition, the capacitive fingerprint sensor is known to be vulnerable to counterfeit fingerprints using silicon or the like.
  • the present invention has been proposed to solve the above-mentioned problems, and can be installed to overlap the display panel without restriction of the installation area in a portable information communication device, and the like, and to provide a light emitting fingerprint recognition panel which minimizes the performance degradation of the display area. Has its purpose.
  • the present invention even when placed on the display panel, by scanning the reflected fingerprint image using its own light source, the fingerprint with high accuracy without the influence of the internal light pattern emitted through the display panel and the external light incident from the external environment It is an object of the present invention to provide a light-emitting fingerprint recognition panel capable of recognizing.
  • the light-emitting fingerprint recognition panel the insulating substrate; And a plurality of unit light-receiving pixels arranged in a matrix form on the insulating substrate, wherein the unit light-receiving pixels include: a light emitting unit having a light emitting element; A light emission switching unit controlling an operation of the light emitting unit; And a light receiving unit having an optical sensor element that receives the light emitted from the light emitting unit and reflected by the fingerprint.
  • the insulating substrate may be a transparent insulating substrate, and the light emitting device and the light receiving unit may be at least partially transparent.
  • the light emitting fingerprint recognition panel may further include a driving circuit unit which detects a signal according to light incident on the light receiving unit while being reflected by a fingerprint during light emission of the light emitting unit in the unit light-receiving pixel.
  • a range of light emission wavelengths showing relatively high light intensity in the light emitting unit in the unit light-receiving pixel and a light receiving wavelength range showing relatively high sensitivity in the light receiving unit may overlap each other.
  • the peak emission wavelength of the light emitting unit may be configured to fall within a sensitivity half width range of the light receiving unit.
  • the sensitivity peak wavelength showing the maximum sensitivity in the light receiving portion may be configured to fall within the light intensity half-width range of the light emitting portion.
  • the light receiving unit may include a phototransistor at least partially transparent.
  • the phototransistor may include a transparent oxide semiconductor active layer, and when the light is received in the wavelength range of 380 nm to 590 nm, the oxide semiconductor active layer may be activated to exhibit conductor characteristics.
  • the photo transistor includes a transparent oxide semiconductor active layer, the oxide semiconductor active layer is activated by blue light, and the transparent light emitting device may be an organic light emitting diode emitting blue light or green light.
  • the light emitting unit may include an organic light emitting diode (OLED), a quantum dot light emitting diode (QLED), or a micro light emitting diode (micro LED).
  • OLED organic light emitting diode
  • QLED quantum dot light emitting diode
  • micro LED micro light emitting diode
  • a light-emitting fingerprint recognition panel comprising: an insulating substrate; A plurality of gate wires extending in a first direction on the insulating substrate; A plurality of data lines extending in a second direction crossing the first direction with an insulating layer interposed therebetween on the gate lines; A plurality of unit light-emitting pixels arranged to correspond to intersections of the plurality of gate lines and the plurality of data lines; And a driving circuit unit having a gate driver connected to the plurality of gate wires and a data driver connected to the plurality of data wires, wherein the unit light-emitting pixel comprises: a light emitting part having a light emitting element; A light emission switching unit connected to the gate line and the data line and controlling an operation of the light emitting unit according to an electrical signal applied thereto; And an optical sensor element, wherein the optical sensor element includes a light receiving portion that provides a signal corresponding to light incident upon being reflected by a fingerprint during light emission of the light emit
  • the insulating substrate may be a transparent insulating substrate, and the light emitting device and the light receiving unit may be at least partially transparent.
  • the gate line and the data line may be formed of a transparent conductive material.
  • the light receiving unit may provide a leakage current according to light incident on the optical sensor element as the signal to the data driver through the data line.
  • the driving circuit unit divides the plurality of unit light-emitting pixels into groups of N (N is a natural number of two or more), and performs N partial frame scanning on the plurality of unit light-emitting pixels of each group. It may be.
  • the N groups may be composed of an odd column group and an even column group or an odd row group and an even row group.
  • the driving circuit unit may prevent the unit light-receiving pixel adjacent to the one unit light-receiving pixel at least in the row direction and the column direction when the unit light-receiving pixel emits light in one partial frame. Can be.
  • the light emitting unit may include an organic light emitting diode (OLED), a quantum dot light emitting diode (QLED), or a micro light emitting diode (micro LED).
  • OLED organic light emitting diode
  • QLED quantum dot light emitting diode
  • micro LED micro light emitting diode
  • the fingerprint display device a flat panel display panel; And a light emitting fingerprint recognition panel disposed on a surface side of the flat panel display panel, the light emitting fingerprint recognition panel having an insulating substrate and a plurality of unit light emitting / receiving pixels arranged in a matrix form on the insulating substrate.
  • the unit light emitting pixel includes: a light emitting unit having a light emitting element; A light emission switching unit controlling an operation of the light emitting unit; And a light receiving unit having an optical sensor element that receives the light emitted from the light emitting unit and reflected by the fingerprint.
  • a fingerprint recognition display device comprising: a flat panel display panel; And a light emitting fingerprint recognition panel disposed on an opposite side of a surface on which the image is displayed on the flat panel display panel, the insulating substrate having a plurality of unit light-receiving pixels arranged in a matrix form on the insulating substrate.
  • the unit light-receiving pixel may include a light emitting part having a light emitting element; A light emission switching unit controlling an operation of the light emitting unit; And a light receiving unit having an optical sensor element that is emitted from the light emitting unit and passes through the flat panel display panel to receive the light reflected by the fingerprint.
  • a light-emitting fingerprint recognition panel that can be installed overlapping with the display panel without the limitation of the installation area, such as a portable information communication device.
  • the light emitting fingerprint recognition panel according to the present invention can minimize the deterioration of display performance while securing a sufficient area by utilizing the display area.
  • the light emitting fingerprint recognition panel even when the light emitting fingerprint recognition panel according to the present invention is disposed on the display panel, the light emitting fingerprint recognition panel scans the reflected fingerprint image using its own light source, thereby preventing the internal light pattern emitted through the display panel and the external light incident from the external environment. It is effective to recognize fingerprints with high accuracy without affecting it.
  • FIG. 1A shows an example of a fingerprint recognition display device in which a light emitting fingerprint recognition panel is disposed on a display panel according to an embodiment of the present invention.
  • FIG. 1B shows an example of a fingerprint recognition display device in which a light emitting fingerprint recognition panel is disposed below the display panel according to an embodiment of the present invention.
  • FIG. 2 schematically shows the configuration of a unit pixel in the light emitting fingerprint recognition panel according to the embodiment of FIG. 1A.
  • FIG. 3 illustrates a principle of detecting a fingerprint pattern in the light emitting fingerprint recognition panel according to the embodiment of FIG. 1A.
  • FIG. 4 shows an example of a configuration of a light-emitting fingerprint recognition panel circuit according to an embodiment of the present invention as an equivalent circuit.
  • FIG. 5 shows another example of the configuration of a light-emitting fingerprint recognition panel circuit according to an embodiment of the present invention as an equivalent circuit.
  • FIG. 6 illustrates an example of a light emitting unit, a light emitting switching unit, and a light receiving unit in a light emitting fingerprint recognition panel according to an embodiment of the present invention.
  • FIG. 7 is a graph illustrating characteristics of a photo transistor constituting a light receiving unit in a light emitting fingerprint recognition panel according to an embodiment of the present invention.
  • FIG. 8 shows an example of a driving circuit for scanning a fingerprint image using a light emitting fingerprint recognition panel according to an embodiment of the present invention.
  • FIG. 9 schematically illustrates a process of obtaining a fingerprint image of one frame by using the driving circuit of FIG. 8.
  • FIG. 10 illustrates another example of a driving circuit for scanning a fingerprint image using a light emitting fingerprint recognition panel according to an embodiment of the present invention.
  • FIG. 11 schematically illustrates a process of obtaining a fingerprint image of one frame by using the driving circuit of FIG. 10.
  • FIG. 12 shows another example of a process of scanning a fingerprint image of one frame by using a light emitting fingerprint recognition panel according to an embodiment of the present invention.
  • FIG. 13 illustrates a relationship between a light amount distribution according to a wavelength of a light emitting unit and a sensitivity distribution according to a wavelength of a light receiving unit in a light emitting fingerprint recognition panel according to an exemplary embodiment of the present invention.
  • light sensor means a sensor element that provides an electrical signal according to the intensity of the applied light.
  • various types of devices such as a photo transistor (photo TFT) and a photo diode, may be included.
  • photo TFT photo transistor
  • infrared sensor In view of the wavelength band to be detected, not only a visible light sensor but also an infrared sensor may be included.
  • FIG. 1A shows an example of a fingerprint recognition display device in which a light emitting fingerprint recognition panel is disposed on a display panel according to an embodiment of the present invention.
  • the light-emitting fingerprint recognition panel 100 may be disposed on the display panel 200 to overlap.
  • the light emitting fingerprint recognition panel 100 may be formed to have a transmittance such that the visibility of the display panel is not significantly reduced.
  • the transmittance may be as low as 50% and preferably at least 90%.
  • the light-emitting fingerprint recognition panel 100 has a plurality of unit light-emitting pixels 110 arranged in a matrix form on the insulating substrate 101.
  • the plurality of unit light-emitting pixels 110 may extend in a plurality of gate lines 102 extending in a first direction (a horizontal direction in this drawing) and in a second direction (vertical direction in this drawing) crossing them. It is connected via a plurality of data wires 103.
  • the gate and data wires 102 and 103 may be, for example, conductive nano materials such as indium tin oxide (ITO), indium zinc oxide (IZO), oxide metal oxide (OMO), or silver nano-wire (silver nano-wire). It may be formed of a transparent conductive material such as a conductive layer including a structure. However, the gate line and the data line may be formed of an electrically conductive metal material such as Cu, Al, Ag, Mo, or Ti.
  • FIG. 1B shows an example of a fingerprint recognition display device in which a light emitting fingerprint recognition panel is disposed below the display panel according to an embodiment of the present invention.
  • the above-described light emitting fingerprint recognition panel 100 may be disposed below the flat panel 200T, that is, opposite to the display surface on which an image is displayed.
  • the flat panel display panel 200T may be an organic light emitting diode (OLED) display panel, a quantum dot light emitting diode (QLED) display panel, or a micro LED display panel. Except for the LCD or PDP panel, this type of flat panel display panel 200T has the light emitted from the light emitting element of the light emitting part of the above-mentioned light emitting fingerprint recognition panel 100 penetrating the flat panel 200T.
  • the light-receiving element belonging to the same light-receiving pixel 110 as the light-emitting portion has a transmittance that can be detected by the light-receiving element of the light-receiving portion.
  • the light emitting fingerprint recognition panel 100 may be formed on an opaque insulating substrate.
  • the insulating substrate also includes a semiconductor substrate covered with an insulating film.
  • the light emitting fingerprint recognition panel according to the present embodiment may be configured regardless of the transmittance range mentioned in the above-described embodiment of FIG. 1A.
  • the light-emitting fingerprint recognition panel may be configured in the same manner except for the difference in transmittance according to the selection of the material.
  • a description will be given mainly of the light emitting fingerprint recognition panel according to the embodiment of FIG. 1A, but the present invention is not limited to either.
  • FIG. 2 schematically illustrates a configuration of a unit light emitting-light receiving pixel in the light emitting fingerprint recognition panel according to the embodiment of FIG. 1A.
  • one unit light-receiving pixel 110 is connected to the gate line 102 and the data line 103, respectively, and is in an ON or OFF state according to a signal applied to the wiring line 102.
  • the light emission switching unit 111 may be formed of a thin film transistor (TFT).
  • the light emitting device constituting the light emitting unit 112 may be, for example, an organic light emitting diode (OLED), a quantum dot light emitting diode (QLED), or a micro LED.
  • the organic light emitting diode (OLED) or the quantum dot light emitting diode (QLED) may be at least a portion of the anode electrode and the cathode electrode is formed of a transparent electrode, or the electroluminescent layer may be made of a transparent material.
  • the optical sensor element constituting the light receiving unit 113 may also be a photo diode or a photo thin film transistor in which at least a portion of an electrode and a semiconductor layer are transparent.
  • the light receiving unit 113 may vary depending on the type or structure of the optical sensor device, but may include a separate switching device for connecting or blocking the optical sensor device to the data line 102 or the like.
  • a separate switching device for connecting or blocking the optical sensor device to the data line 102 or the like.
  • an oxide semiconductor material may be applied to the semiconductor channel region.
  • materials that form an insulating layer, a protective film, or the like may be used as those applicable to the transparent display device.
  • the size of the unit light-receiving pixel 110 may be determined according to the resolution level required for identification of the fingerprint pattern, which is smaller than the pitch of the ridge and valley of the general fingerprint. It is preferable to have (P1) and height (P2). For example, the width P1 and the height P2 may each be about 50 ⁇ m.
  • FIG. 3 illustrates a principle of detecting a fingerprint pattern in the light emitting fingerprint recognition panel according to the embodiment of FIG. 1A.
  • the left side of the two unit light-receiving pixels 110A and 110B shown in this drawing will be referred to as the unit pixel A 110A and the right side as the unit pixel B 110B.
  • the ridge portion of the fingerprint corresponds to the unit pixel A 110A, and the valley portion of the fingerprint is placed on the unit pixel B 110B.
  • the corresponding case is shown conceptually.
  • a large amount of light emitted from the unit pixel A 110A is a ridge of the fingerprint. Part, more specifically, is reflected from the dermis inside the ridge and is received by the light receiving portion 113A.
  • unit pixel B110B a large amount of emitted light is absorbed or diffusely reflected in the bone portion of the fingerprint so that it is relatively small. Only positive light is received by the light receiving portion 113B.
  • the unit pixel A 110A and the unit pixel B 110B generate electrical signals having different intensities according to the intensity of the received light, and more specifically, in the driving circuit unit through the connected data lines, more specifically, the driving circuit unit. It is provided to the readout circuit part.
  • the light emitting fingerprint recognition panel may provide an image information of a fingerprint pattern by detecting an electrical signal according to the amount of light received through light emission and reflection in each unit light-receiving pixel.
  • the light emitting units 112A and 112B and the light receiving units 113A and 113B are provided for each of the unit pixels 110A and 110B, so that light paths leading to light emission, reflection, and light reception are short. . Therefore, accurate detection of the fingerprint portion in contact with the unit pixel is possible.
  • scattering of reflected light may be minimized to minimize interference of reflected light of other portions of the light receiving unit.
  • the display may be set to black to absorb light emitted from the bottom of the light emitting portion.
  • the light emitting unit and the light receiving unit may be tuned such that each wavelength range overlaps each other at least in part so that a main emission wavelength band and a wavelength band having high light receiving sensitivity coincide with each other.
  • the light emitting fingerprint recognition panel according to the present invention can recognize a fingerprint with high accuracy without the influence of display light or external light. This will be described later in more detail with reference to FIG. 11.
  • the emission and reception wavelength bands of the light emitting units 112A and 112B and the light receiving units 113A and 113B may be set to be different between two unit light emitting / receiving pixels 110A and 110B adjacent to each other during the manufacturing process. It may be.
  • the light receiving portion 113A of one unit pixel 110A is not affected by the light emitted from the light emitting portion 112B of the adjacent unit pixel 110B, more accurate optical information on the fingerprint portion in contact with the corresponding unit pixel is provided. Can be detected.
  • FIG. 4 shows an example of a configuration of a light-emitting fingerprint recognition panel circuit according to an embodiment of the present invention as an equivalent circuit.
  • the light emitting unit 112I may be formed of an organic light emitting diode OLED having an inverted type.
  • the cathode of the organic light emitting diode may be formed on a layer closer to the insulating substrate than the anode, and may be connected to the source / drain terminals of the thin film transistor constituting the light emission switching unit 111.
  • the photodiode constituting the light receiving unit 113I may also have a structure in which its cathode is disposed close to the insulating substrate.
  • the data driver 130I applies different data voltages to the odd-numbered data line 103 (O) and the even-numbered data line 103 (E).
  • the even-numbered data line 103 In the unit light-receiving pixel connected to E)), light emission and light reception are not performed, thereby preventing noise due to optical interference between adjacent unit pixels.
  • FIG. 5 shows another example of the configuration of a light-emitting fingerprint recognition panel circuit according to an embodiment of the present invention as an equivalent circuit.
  • the light emitting unit 112N may be configured of an organic light emitting device having a normal structure.
  • the anode of the organic light emitting diode may be formed on a layer closer to the insulating substrate than the cathode, and may be connected to the source / drain terminals of the thin film transistor constituting the light emission switching unit 111.
  • the photodiode constituting the light receiving unit 113N may also have a structure in which the anode electrode is disposed close to the insulating substrate.
  • the data driver 130N may apply different data voltages to the odd-numbered data line 103 (O) and the even-numbered data line 103 (E). That is, when a signal for turning on the light emitting unit 112N and the light receiving unit 113N is applied to the odd-numbered data line, the OFF signal may be applied to the even-numbered data line. As in the above-described embodiment of FIG. 4, the influence of the unit column-receiving pixels in adjacent columns is excluded.
  • FIG. 6 illustrates an example of a light emitting unit, a light emitting switching unit, and a light receiving unit in a light emitting fingerprint recognition panel according to an embodiment of the present invention.
  • Each of the unit light-receiving pixels includes a light emitting element 112L, a light emitting switch (SW) 111 for controlling the light emitting unit, and a phototransistor (PT) 113P constituting the light receiving unit.
  • This embodiment differs from the above embodiment in which the light receiving unit is configured using a photodiode, and the light receiving unit is configured using a photo transistor PT. Although it may further include a switching transistor for controlling the voltage applied to the source / drain electrode 103P of the photo transistor 113P, it is not shown in this figure. This is because the switching transistor of the light receiving unit may be configured in the same manner as the light emitting switch 111.
  • a cross section of a portion of the light emitting fingerprint recognition panel 100 corresponding to two unit light-receiving pixels is shown.
  • the ridge R of the fingerprint F is positioned above the left unit light-receiving pixel, and the valley V of the fingerprint is positioned above the right unit light-receiving pixel.
  • the ridge portion of the fingerprint is in contact with the upper surface of the unit light emitting / receiving pixel on the left side, a large amount of light emitted from the light emitting element 112L causes The light is reflected by the dermis inside the ridge and received in the channel region A of the phototransistor 113P constituting the light receiving portion.
  • the unit light-receiving pixel on the right side there is a slight gap between the upper surface and the valleys V of the fingerprint, so that only a relatively small amount of light emitted from the light-emitting element is received by the photo transistor PT of the pixel. do.
  • the same input voltage is applied to the source or drain electrode 103P of the photo transistor PT of each pixel during light emission, and the gate OFF signal is applied to their gate electrode 102P, they are the channel region A. Different leakage currents are generated depending on the amount of light received.
  • the light emitting fingerprint recognition panel 100 may detect the electrical signal according to the amount of light received through the light emission and the reflection in each unit light-receiving pixel, and provide image information of the fingerprint pattern.
  • the light emitting element 112L and the phototransistor 113P serving as the light receiving element are provided for each unit light-receiving pixel, so that light paths leading to light emission, reflection, and light reception are short. Therefore, accurate detection of the fingerprint portion in contact with the corresponding unit pixel is possible without the influence from the adjacent pixel region.
  • the light emitting element 112L and the phototransistor 113P constituting the light receiving unit may be tuned such that the light emission wavelength band and the wavelength band having high light receiving sensitivity overlap each other.
  • tuning may be performed by adjusting a material constituting the light emitting layer of the light emitting device, a material constituting the channel region of the photo transistor, a stacked structure, or the like.
  • the light emitting device 112L includes an organic light emitting diode having at least a portion of the lower electrode 151 as an anode electrode and the upper electrode 153 as a cathode electrode as a transparent electrode, and an electroluminescent layer 152 disposed therebetween.
  • OLED organic light emitting diode
  • QLED quantum dot light emitting diode
  • an organic electroluminescent material emitting blue light is employed when the driving current flows between the lower electrode 151 and the upper electrode 153 in the electroluminescent layer 152 will be described.
  • the electroluminescent layer 152 emits light of a wavelength band having high photoreactivity of the phototransistor 113P, and may be employed as long as it can ensure durability.
  • the lower electrode 151 which is the anode electrode of the light emitting element 112L, is connected to one of the source / drain electrodes 103S of the switching transistor 112S through the contact hole 104, and thus, The drive current according to the control is supplied.
  • the lower electrode 151 may be a patterned transparent electrode. Although the lower electrode 151 is disposed above the light switch 111 in this figure, it may be disposed at another position.
  • the upper electrode 153 which is a cathode of the light emitting device 112L, may be formed on the front surface of the light emitting fingerprint recognition panel 100.
  • An encapsulation layer 124 may be formed on the upper electrode 153.
  • the photo transistor 113P and the light emitting switch 111 preferably have oxide semiconductor active layers 130 and 140 as active layers constituting respective channel regions. In this case, they have a similar structure as a whole except for the oxide semiconductor active layers 130 and 140. As a result, a process of manufacturing the phototransistor 113P and the light emitting switch 111 may be simplified.
  • the phototransistors PT and 113P and the light emitting switches SW and 111 may include the gate electrodes 102P and 102S, the gate insulating layer 121, and the source and drain electrodes 103P and 103S formed on the same layer, respectively.
  • a transparent insulating protective film 122 is formed on the phototransistors PT and 113P and the light emitting switch SW and 111 which are switching transistors, and a transparent insulating layer compensating for the height difference between the portions without the light emitting element 112L.
  • the planarization layer 123 may be formed.
  • the transparent insulating gate insulating layer 121, the passivation layer 122, the planarization layer 123, and the encapsulation layer 124 may be formed of a material generally applied to an OLED display panel.
  • the gate electrodes 102P and 102S and the source / drain electrodes 103P and 103S and the gate wirings and lead-out wirings not shown may be formed in a metal thin film pattern, or may be formed of a transparent conductive thin film pattern such as ITO or IZO. It may be formed.
  • a light shielding film 155 may be further provided on the channel region of the light emitting switch SW 111 to block light in order to secure stability of the switching operation.
  • the gate electrode and the gate wiring are formed in a metal thin film pattern
  • the gate electrode may serve to block light flowing into the channel region, and thus, in the case of the switching transistor, the width of the gate electrode 102S may be the semiconductor active layer 140.
  • a double gate structure having a separate upper gate electrode on the upper surface of the semiconductor active layer may also help to secure switching stability.
  • the oxide semiconductor active layer 130 of the photo transistors PT and 113P and the oxide semiconductor active layer 140 of the switching transistor SW and 111 are disposed on the gate insulating layer 121 and the source and drain electrodes 103P, It is common in that it is arrange
  • the oxide semiconductor active layer 140 of the light emitting switch SW 111 has a single layer structure composed of a first oxide semiconductor layer
  • the oxide semiconductor active layer 140 of the switching transistor constituting the light emitting switch 111 may be formed of a single layer of AIZTO, that is, Al: InZnSnO, as the first oxide semiconductor layer.
  • the oxide semiconductor active layer 130 of the phototransistors PT and 113P may have a double layer structure in which an IZO, that is, an InZnO layer is interposed between the AIZTO layer and the gate insulating layer 121, as the second oxide semiconductor layer.
  • the IZO layer may be formed in a triple layer structure in which sandwiches are stacked between the layers.
  • the photo transistors PT and 113P exhibit high sensitivity to blue light having a wavelength band of about 380 nm to 590 nm, more specifically, about 473 nm. Therefore, in this case, the electroluminescent layer 152 constituting the transparent invention element 112L may employ an organic electroluminescent material that mainly emits light in a wavelength band of blue to green series, more preferably 380 nm to 590 nm. Can be.
  • FIG. 7 is a graph illustrating characteristics of a photo transistor constituting a light receiving unit in a light emitting fingerprint recognition panel according to an embodiment of the present invention.
  • the graph shows the electrical characteristics in the case of the double layer structure in which the IZO layer is formed as the second oxide semiconductor layer on the gate insulating layer in the semiconductor channel region of the photo transistor PT and the AIZTO layer is formed thereon as the first oxide semiconductor layer.
  • the photo transistor PT shows the same characteristic curve (see solid curve) as in the dark in the dark, but when light is irradiated to the channel region (in this graph, light of 473 nm wavelength is irradiated at an intensity of 1 mW / cm 2). Electrical conductivity is significantly increased (see dashed line curve).
  • the threshold voltage is lower than before exposure (see the dotted curve). It was confirmed that the reduction can be solved by applying a pulse signal above the threshold voltage to the gate electrode by about 10 ns.
  • the first oxide semiconductor layer that is, a switching transistor having a channel region having an AIZTO single layer structure (thickness of 30 nm) is not separately illustrated, but the Dark_Vds 10V condition indicated by a solid line in this graph regardless of whether light is irradiated to the channel region.
  • FIG. 8 illustrates an example of a driving circuit for scanning a fingerprint image using a light emitting fingerprint recognition panel according to an embodiment of the present invention
  • FIG. 9 illustrates obtaining a fingerprint image of one frame using the driving circuit of FIG. 8. The process is outlined.
  • the gate driver 120P may apply a progressive scan gate on signal to a plurality of gate lines 102 connected thereto.
  • the data driver 130C may provide a data signal to turn on or off the light emitting unit 112 and the light receiving unit 113 in a column unit.
  • a signal for turning ON the light emitting unit 112 and the light receiving unit 113 is applied to the odd data line 103 (O), and the even data line 103 (E).
  • the gate driver 120P performs the first progressive scanning SP1 in a state where a signal for turning them off is applied to the odd-numbered column, as shown in FIG. Fingerprint recognition data of 1/2 partial frame for the pixels of (C (O)) is obtained.
  • the data driver 130C performs the second progressive scanning SP2 while applying the data signal opposite to the above, and the even-numbered column C (E) as shown in FIG. 9 (b). Fingerprint identification data of a 2/2 partial frame with respect to the pixels may be obtained.
  • the plurality of unit pixels constituting the light-emitting fingerprint recognition panel is divided into two groups of odd column (C (O)) and even column (C (E)), and two partial frame scanning for each group By performing the operation, it is possible to obtain accurate fingerprint recognition data for the entire frame.
  • FIG. 10 shows another example of a driving circuit for scanning a fingerprint image using a light emitting fingerprint recognition panel according to an embodiment of the present invention
  • FIG. 11 obtains a fingerprint image of one frame using the driving circuit of FIG. The process is outlined.
  • the gate driver 120I may apply an interlaced scan gate ON signal to a plurality of gate lines 102 connected thereto.
  • the gate-on signal is sequentially applied from the top to the bottom of the odd-numbered gate lines 102 (O) of FIG. 10, and the odd-numbered rows R (O) as shown in FIG. 11A.
  • the fingerprint recognition data of the half partial frame for the pixels of) is obtained, and then the gate ON signal is sequentially applied to the even-numbered gate lines 102 (E), thereby to obtain the ( As shown in b), fingerprint identification data of 2/2 partial frames of pixels in even-numbered rows R (E) may be obtained.
  • the plurality of unit pixels constituting the light-emitting fingerprint recognition panel is divided into two groups of odd row (R (O)) and even row (R (E)), and two partial frame scanning for each group By performing the operation, it is possible to obtain accurate fingerprint recognition data for the entire frame.
  • FIG. 12 shows another example of a process of scanning a fingerprint image of one frame by using a light emitting fingerprint recognition panel according to an embodiment of the present invention.
  • the driving circuit unit of the light-emitting fingerprint recognition panel includes a plurality of unit pixels constituting the light-emitting fingerprint recognition panel in odd rows R (O), even rows R (E), and odd columns C ( O)) and four groups according to four combinations of even columns C (E), and 1/4 to 4/4 partial frame scanning may be sequentially performed for each group.
  • the unit light-receiving pixel adjacent to the one unit light-receiving pixel at least in the row direction and the column direction does not emit light, and thus is adjacent to each other. Accurate fingerprint identification data without optical interference from unit pixels may be obtained.
  • FIG. 13 illustrates a relationship between a light amount distribution according to a wavelength of a light emitting unit and a sensitivity distribution according to a wavelength of a light receiving unit in a light emitting fingerprint recognition panel according to an exemplary embodiment of the present invention.
  • the lower graph shows the light intensity distribution according to the light emission wavelength of a light emitting unit in a unit light-receiving pixel
  • the upper graph shows the light receiving wavelength of the light receiving unit in the same unit light-receiving pixel.
  • Sensitivity distribution the light emitting part has a light emission peak wavelength W PL within a wavelength range W 1 to W 2 in which the light emission part has a half width at half sensitivity of the light receiving part in the same unit pixel, that is, a sensitivity at least half S H of the maximum sensitivity S M. Can be tuned to belong.
  • W PL light emission peak wavelength
  • the wavelength band tuning between the light emitting part and the light receiving part may be performed by adjusting various parameters such as the composition of the material constituting the light emitting part and the light receiving part or the thickness of the thin film.
  • the present invention relates to a flat panel fingerprint sensor panel and a device in which the panel and the flat panel display device are combined.
  • the present invention relates to a portable information communication device, a vehicle information display device, or a financial transaction device. It can be used in the field.

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PCT/KR2017/004407 2016-04-28 2017-04-26 언더글라스 적용이 가능한 발광 지문 인식 패널 및 이를 포함하는 지문 인식 디스플레이 장치 WO2017188715A2 (ko)

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