WO2020001558A1 - Oled显示面板、其驱动方法及显示装置 - Google Patents

Oled显示面板、其驱动方法及显示装置 Download PDF

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Publication number
WO2020001558A1
WO2020001558A1 PCT/CN2019/093370 CN2019093370W WO2020001558A1 WO 2020001558 A1 WO2020001558 A1 WO 2020001558A1 CN 2019093370 W CN2019093370 W CN 2019093370W WO 2020001558 A1 WO2020001558 A1 WO 2020001558A1
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Prior art keywords
light
display panel
oled display
electrically connected
transistor
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PCT/CN2019/093370
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English (en)
French (fr)
Inventor
杨盛际
董学
陈小川
王辉
卢鹏程
Original Assignee
京东方科技集团股份有限公司
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Priority to US16/755,966 priority Critical patent/US11210492B2/en
Publication of WO2020001558A1 publication Critical patent/WO2020001558A1/zh

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • 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]
    • G09G3/3266—Details of drivers for scan electrodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/126—Shielding, e.g. light-blocking means over the TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
    • 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
    • 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
    • G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14678—Contact-type imagers

Definitions

  • the present disclosure relates to the field of display technology, and particularly to an OLED display panel, a driving method thereof, and a display device.
  • fingerprint recognition in a display device mainly implements fingerprint recognition in the display area by adding infrared light-emitting sub-pixels and fingerprint light-sensitive devices to the original pixels.
  • infrared light emission After the light emitted by the sub-pixel is reflected by the fingerprint, it can be received by a wide range of fingerprint photosensitive devices, and the sensitivity of fingerprint valley and ridge recognition is not high.
  • the embodiments of the present disclosure provide an OLED display panel, a driving method thereof, and a display device for improving the sensitivity of fingerprint recognition.
  • a display area in which a plurality of organic electroluminescent structures arranged in a matrix are arranged;
  • a fingerprint recognition area wherein the fingerprint recognition area is located in the display area, and a plurality of photosensitive units are further arranged in the fingerprint recognition area, and the photosensitive units are located on a backlight side of the organic electroluminescence structure;
  • the display panel further includes:
  • a first light-shielding layer is located between the photosensitive unit and the organic electroluminescent structure, and the first light-shielding layer is a hollow area at least in a region corresponding to the fingerprint recognition area,
  • the hollowed-out area of the first light-shielding layer has a plurality of vias penetrating through the first light-shielding layer, and the vias are located in a region corresponding to a gap between adjacent organic electroluminescent structures.
  • the first light-shielding layer is a hollowed-out area in an area corresponding to the display area.
  • a size of the via hole is smaller than or equal to a size of the organic electroluminescent structure.
  • an orthographic projection of the first light-shielding layer of the photosensitive unit covers an area where at least one of the via holes is located.
  • a pixel-defining layer is further provided between two adjacent organic electroluminescent structures, and the pixel-defining layer is provided with a corresponding opening at a position corresponding to the via hole.
  • the display area is further provided with a pixel circuit electrically connected to each of the organic electroluminescent structures;
  • the first light-shielding layer is located between the pixel circuit and the organic electroluminescent structure.
  • the organic electroluminescent structure includes: an anode layer;
  • the pixel circuit includes a thin film transistor, and the thin film transistor includes: an active layer, and a source and drain layer on a side of the active layer facing the first light shielding layer;
  • the first light-shielding layer is located between the source-drain layer and the anode layer.
  • the display area is further provided with a connection electrode disposed on the same layer as the first light-shielding layer and insulated, and the pixel circuit is connected with all the electrodes through the connection electrode.
  • the organic electroluminescence structure is described.
  • the display area is further provided with a signal line, and the first light-shielding layer and the signal line do not overlap in a screen direction perpendicular to the display panel. region.
  • the signal line includes one or a combination of the following:
  • the display area is further provided with a second light shielding layer provided around a plurality of the photosensitive units.
  • the display area is further provided with a substrate
  • the organic electroluminescent structure and the first light-shielding layer are located on one side of the base substrate;
  • the photosensitive unit and the second light-shielding layer are located on the other side of the base substrate.
  • the OLED display panel provided in the embodiment of the present disclosure further includes a gate driving circuit; wherein,
  • the gate driving circuit includes a plurality of shift register units corresponding to the organic electroluminescence structures in each row; the shift register units are used for pixel circuits electrically connected to the organic electroluminescence structures in a corresponding row; Provide light control signals;
  • the shift register unit corresponding to the organic display light emitting structure in the fingerprint recognition area in the gate driving circuit is a first shift register unit, and the other shift register units are second shift register units;
  • the first shift register unit is electrically connected to a first power line, and each of the second shift register units is electrically connected to a second power line.
  • the photosensitive unit includes a photodiode.
  • the display panel further includes a signal reading unit electrically connected to each of the photodiodes, wherein the signal reading unit includes: a first transistor, A second transistor, a third transistor, a first capacitor, a second capacitor, an operational amplifier, and a control switch;
  • a gate of the first transistor is electrically connected to a reset signal terminal, a first pole of the first transistor is electrically connected to a common voltage signal terminal, and a second pole of the first transistor is connected to one end of the photodiode and A gate of the second transistor is electrically connected;
  • a first pole of the second transistor is electrically connected to a power supply voltage terminal, and a second pole of the second transistor is electrically connected to a first pole of the third transistor;
  • a gate of the third transistor is electrically connected to a control terminal, and a second pole of the third transistor is electrically connected to a negative input terminal of the operational amplifier;
  • a positive input terminal of the operational amplifier is electrically connected to a reference signal terminal, and an output terminal of the operational amplifier is used for reading signals;
  • the first capacitor is electrically connected between a gate of the second transistor and a common voltage signal terminal;
  • the second capacitor is electrically connected between a negative input terminal and an output terminal of the operational amplifier
  • the control switch is connected in parallel to both ends of the second capacitor.
  • an embodiment of the present disclosure further provides a display device including any one of the foregoing OLED display panels provided by the embodiments of the present disclosure.
  • an embodiment of the present disclosure also provides a driving method for driving the above-mentioned OLED display panel, and the display and fingerprint recognition are driven in a time-sharing manner within a cycle;
  • the organic electroluminescent structure in the fingerprint recognition area is driven to emit light, and fingerprint recognition is performed according to an output signal of the photosensitive unit.
  • the organic electroluminescent structure that emits green light in the fingerprint recognition area is driven to emit light.
  • all areas other than the fingerprint recognition area are inserted in black.
  • a first light-shielding layer is provided between the photosensitive unit and the organic electroluminescence structure, and the first light-shielding layer is at least in an area corresponding to the fingerprint recognition area. Openwork area.
  • the light emitted by the organic electroluminescence structure is irradiated onto the photosensitive unit from the small hole through the reflection of the finger. Due to the difference in light brightness reflected by the finger valley, the fingerprint information of the finger is sensed. Since the small holes in the hollowed-out area can increase the concentration of light intensity, it can maximize the sensitivity of the finger when sensing.
  • FIG. 1 is a schematic plan view of an OLED display panel according to an embodiment of the present disclosure
  • FIG. 2 is a schematic partial cross-sectional structure diagram of an OLED display panel according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of a first light-shielding layer in an OLED display panel according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of an OLED display panel according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a signal reading unit in an OLED display panel according to an embodiment of the present disclosure
  • FIG. 6 is a timing diagram corresponding to the signal reading unit shown in FIG. 5;
  • FIG. 7 is a schematic structural diagram of an OLED display panel according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a shift register unit according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure.
  • FIG. 10 is a driving timing diagram of an OLED display panel provided by an embodiment of the present disclosure.
  • the embodiments of the present disclosure provide an OLED display panel, a driving method thereof, and a display device.
  • the present disclosure will be described in further detail with reference to the accompanying drawings. Obviously, the described The embodiments are only a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative labor shall fall within the protection scope of the present disclosure.
  • the display panel includes:
  • a plurality of organic electroluminescent structures 01 arranged in a matrix are arranged in the display area A;
  • a fingerprint recognition area A1 the fingerprint recognition area A1 is located in the display area A, and a plurality of photosensitive units 02 are also arranged in the fingerprint recognition area A1, and the photosensitive units 02 are located on the backlight side of the organic electroluminescent structure 01;
  • the display panel also includes:
  • the first light-shielding layer 03, the first light-shielding layer 03 is located between the photosensitive unit 02 and the organic electroluminescent structure 01, and the first light-shielding layer 03 is a hollow area at least in an area corresponding to the fingerprint recognition area A1, wherein the first light-shielding layer 03
  • the hollowed-out area of the layer 03 has a plurality of via holes 031 penetrating the first light-shielding layer 03. As shown in FIG.
  • the via hole 031 is located in a region corresponding to the gap between the adjacent organic electroluminescent structure 01 and is perpendicular to In the direction of the first light-shielding layer 03, there is an overlap region between the via hole 031 and the adjacent organic electroluminescent structure 01.
  • a first light-shielding layer is provided between the photosensitive unit and the organic electroluminescence structure, and the first light-shielding layer is a hollowed-out area at least in a region corresponding to the fingerprint recognition area, and the via hole is located in a phase opposite to the phase. A region corresponding to a gap between adjacent organic electroluminescent structures.
  • the first light-shielding layer when the first light-shielding layer is a hollowed-out area only in an area corresponding to the fingerprint recognition area, there may be a difference between the fingerprint recognition area and other display areas during display. Therefore, optionally, in the OLED display panel provided in the embodiment of the present disclosure, as shown in FIG. 3, the first light-shielding layer 03 is a hollowed-out area in an area corresponding to the display area A.
  • one via hole in the hollowed out area may correspond to one organic electroluminescence structure, or may correspond to multiple organic electroluminescence structures, or one via hole may correspond to one
  • the photosensitive unit may also correspond to multiple photosensitive units.
  • the size of the vias is set according to the recognition accuracy. The higher the accuracy, the larger the number of vias, and the smaller the via area, which is not limited here.
  • the size of the via hole 031 is smaller than or equal to the size of the organic electroluminescent structure 01.
  • small holes with a size smaller than or equal to the size of the organic electroluminescence structure 01 are opened in the first light-shielding layer, so that the display panel has higher fingerprint recognition accuracy under the premise that the process can realize the production of small holes. .
  • the orthographic projection of the photosensitive unit 02 on the first light-shielding layer 03 covers an area where the at least one via hole 031 is located. Because the accuracy of general fingerprint recognition is smaller than that of pixels, that is, the size of the photosensitive unit 02 is larger than the size of the organic electroluminescent structure 01, when the via hole 031 is located between adjacent organic electroluminescent structures 01, and then A plurality of via holes 031 may be provided at a position corresponding to one photosensitive unit 02.
  • a pixel defining layer 114 is further provided between two adjacent organic electroluminescent structures 01, and the pixel defining layer 114 is provided with a corresponding opening at a position corresponding to the via hole 031.
  • corresponding openings are also provided at the positions of the pixel-defining layer 114 corresponding to the vias 031, which can reduce the blocking of light by the pixel-defining layer 114 and increase the intensity of light incident on the photosensitive unit 02.
  • the display area is further provided with a pixel circuit 04 electrically connected to each organic electroluminescent structure 01;
  • the first light-shielding layer 03 is located between the pixel circuit 04 and the organic electroluminescent structure 01.
  • the organic electroluminescent structure 01 includes: an anode layer;
  • the pixel circuit 04 includes a thin film transistor, and the thin film transistor includes: an active layer, and a source and drain layer located on a side of the active layer facing the first light shielding layer 03; the first light shielding layer 03 may be specifically located between the source and drain layers and the anode layer .
  • the display region is further provided with a connection electrode disposed on the same layer as the first light-shielding layer and insulated, and the pixel circuit is connected to the organic electroluminescence structure through the connection electrode.
  • a connection electrode disposed on the same layer as the first light-shielding layer and insulated, and the pixel circuit is connected to the organic electroluminescence structure through the connection electrode.
  • the electrical connection electrode and the first light-shielding layer are disposed on the same layer, and the pattern of the first light-shielding layer and the electrical connection electrode can be formed by a single patterning process without adding a patterning process.
  • the display area is further provided with a signal line, and there is no overlapping area between the first light shielding layer and the signal line in a screen direction of the vertical display panel. That is, the first light-shielding layer and the signal line do not have a direct area, so that the first light-shielding layer and the signal line cannot form a capacitor, thereby reducing the loading on the signal line.
  • the signal line generally includes one or a combination of a data line, a scanning line, a power line, and the like, as long as the wires are located in the display area, they are all within the category of signal lines, which is not limited herein.
  • the thickness of the film layer between the first light shielding layer and the signal line may be increased.
  • the display area is further provided with a second light-shielding layer 05 provided around the plurality of photosensitive units 02. This prevents light from the side from affecting the photosensitive unit.
  • a display substrate is further provided with a substrate; the organic electroluminescent structure and the first light-shielding layer are located on one side of the substrate; the photosensitive unit and the second light-shielding layer Located on the other side of the substrate. That is, it is equivalent to placing the photosensitive unit behind the base substrate.
  • the photosensitive unit may also be located on the same side of the substrate as the organic electroluminescent structure, which is not limited herein.
  • the photosensitive unit when a photosensitive unit is placed on a base substrate, the photosensitive unit is generally formed on a chip first, and then the chip and the base substrate are combined.
  • the base substrate may be a flexible substrate, or a hard substrate made of glass or the like, which is not limited herein.
  • the pixel circuit generally includes a driving transistor, a switching transistor, and the like, and the pixel circuit is electrically connected to the organic electroluminescent structure through the driving transistor.
  • a transistor generally includes a gate, a source, a drain, and an active layer.
  • the organic electroluminescence structure generally includes an anode layer, a light emitting layer, and a cathode layer that are sequentially stacked.
  • a buffer layer 101 an active layer 102, a gate insulating layer 103, a gate 104, an interlayer dielectric layer 105, a source electrode 106, Drain 107, first planarization layer 108, connection electrode 109 provided in the same layer, and first light-shielding layer 03, second planarization layer 110, anode layer 111, light-emitting layer 112, cathode layer 113, pixel-defining layer 114, and package Layer 115.
  • a second light-shielding layer 05 and a photosensitive unit 02 are provided on the other side of the base substrate 100.
  • the organic electroluminescent structure 01 composed of the anode layer 111, the light emitting layer 112, and the cathode layer 113 is electrically connected to the drain electrode 107 through the connection electrode 109.
  • the first light-shielding layer 03 has a via hole 031, and the organic electroluminescent structure 01 emits The light reflected by the finger is irradiated onto the photosensitive unit 02 from the via hole 031 through the reflection of the finger. Because the brightness of the light reflected by the valley of the finger is different, the fingerprint information of the finger is sensed. Because the via hole 031 can increase the light intensity convergence, the sensitivity of the finger touch can be maximized.
  • the photosensitive unit 02 is placed on the base substrate 100.
  • the photosensitive unit 02 is generally formed on the chip 200 first, and then the chip 200 and the base substrate 100 are combined.
  • FIG. 4 illustrates one of the photosensitive units 02 in the chip 200 as an example.
  • the transistor may be a top-gate structure, a bottom-gate structure, or other structures, which are not limited herein.
  • FIG. 4 is a top-gate structure as an example.
  • the OLED display panel may be a top-emission OLED display panel, that is, display light is emitted upward, and the anode layer 111 may be a reflective anode. Since the top-emitting OLED display panel basically uses a microcavity structure, it is necessary for this disclosure to make holes in the first light-shielding layer for light collection.
  • the transistor may have a single-gate structure as shown in FIG. 4, and may also be designed as a multi-gate structure such as a double gate according to actual requirements, which is not limited herein.
  • the photosensitive unit generally includes a photodiode.
  • the display panel further includes a signal reading unit 201 electrically connected to each photodiode PIN.
  • the signal reading unit 201 includes: a first A transistor T1, a second transistor T2, a third transistor T3, a first capacitor C1, a second capacitor C2, an operational amplifier A, and a control switch K1;
  • the gate of the first transistor T1 is electrically connected to the reset signal terminal Reset, the first pole of the first transistor T1 is electrically connected to the common voltage signal terminal Vcom, and the second pole of the first transistor T1 is respectively connected to the anode of the photodiode PIN and the second The gate of the transistor T2 is electrically connected;
  • the first pole of the second transistor T2 is electrically connected to the power supply voltage terminal Vdd, and the second pole of the second transistor T2 is electrically connected to the first pole of the third transistor T3;
  • the gate of the third transistor T3 is electrically connected to the control terminal EM, and the second electrode of the third transistor T3 is electrically connected to the negative input terminal of the operational amplifier A;
  • the positive input terminal of the operational amplifier A is electrically connected to the reference signal terminal Vref, and the output terminal of the operational amplifier A is used for reading signals;
  • the first capacitor C1 is electrically connected between the gate of the second transistor T2 and the common voltage signal terminal Vcom;
  • the second capacitor C2 is electrically connected between the negative input terminal and the output terminal of the operational amplifier A;
  • the control switch K1 is connected in parallel to both ends of the second capacitor C2.
  • the cathode of the photodiode PIN is electrically connected to the fixed potential terminal Vd.
  • fingerprint recognition is performed by a signal reading unit shown in FIG. 5.
  • the signal reading unit may be provided on a chip, and of course, some transistors may be integrated on a substrate. It is not limited here.
  • the timing diagram corresponding to the signal reading unit shown in FIG. 5 is shown in FIG. 6, and the specific working principle is: the reset signal terminal Reset controls the first transistor T1 to be turned on, resets the potential of the N1 node, and uses a photodiode The PIN is reversely connected. The more light intensity the photodiode PIN receives, the greater the current generated by the potential of the first node N1 to control the second transistor T2.
  • the control terminal EM controls the third transistor to be turned on, the current output by the second transistor T2 After the third transistor T3 is amplified by the operational amplifier A and output, the fingerprint ridge or valley can be determined by reading the signal at the output of the operational amplifier A.
  • the specific structure of the signal reading unit is not limited to this, and may also be other structures capable of realizing the above-mentioned reading signal, which is not limited herein.
  • the OLED display panel provided in the embodiment of the present disclosure further includes a gate driving circuit 300;
  • the register unit EOAn is used to provide a light emission control signal to a pixel circuit electrically connected to the organic electroluminescent structure of the corresponding row;
  • the shift register units EOA8 to EOA10 corresponding to the organic display light-emitting structure 01 in the fingerprint recognition area A1 in the gate driving circuit 300 are the first shift register units, and other shift register units EOA1 to EOA7, EOA11 to EOA16 are the second Shift register unit; each first shift register unit EOA8 ⁇ EOA10 is electrically connected to the first power line VG1, each second shift register unit EOA1 ⁇ EOA7, EOA11 ⁇ EOA16 is electrically connected to the second power line VG2.
  • the shift register unit generally controls the potential of the output light-emitting control signal through a power line electrically connected to the shift-register unit.
  • the power line that is generally electrically connected to the shift register unit is used to transmit high-potential signals; when the effective potential of the light-emitting control signal is low, the power line that is generally electrically connected to the shift register unit is used to transmit low-potential signals .
  • the shift register unit controls the potential of the light emission control signal through the power supply line VGL.
  • all the shift register units are electrically connected to the same power line, and the shift register unit shown in FIG. 8 is also taken as an example.
  • the power line VGL is electrically connected, so it cannot achieve sub-region control.
  • the first shift register unit in the gate driving circuit is electrically connected to the first power supply line
  • the second shift register unit is electrically connected to the second power supply line.
  • the light emitting structure is controlled separately from the organic electroluminescent structure in other areas, so that when fingerprint recognition is performed, all non-fingerprint recognition areas in the display area are inserted in black. That is, when fingerprint recognition is performed, only the organic electroluminescence structure in the fingerprint recognition area emits light, and the organic electroluminescence structures in other areas are turned off, so that the signal-to-noise ratio of the fingerprint recognition can be improved.
  • the gate driving circuit 7 is only an implementation manner provided in the embodiment of the present disclosure for implementing black insertion of all non-fingerprint identification areas of a display area during fingerprint recognition, and the present disclosure is not limited thereto
  • the gate driving circuit may have other embodiments capable of realizing the above functions.
  • a method of unilateral driving is possible, that is, as shown in FIG. 7, the gate driving circuit 300 is disposed on only one side.
  • a bilateral driving method may also be adopted, that is, the gate driving circuit 300 is disposed on both sides, which is not limited herein.
  • the OLED display panel provided in the embodiment of the present disclosure further includes a source driving circuit 400 for supplying a power signal to the pixel circuit.
  • a gate driver is used. 300 sends a light emission control signal to the pixel circuits electrically connected to the organic electroluminescence structure 01 in the corresponding row of the fingerprint recognition area, and sends a power signal to the pixel circuits in the corresponding column of the fingerprint recognition area through the source driving circuit 400, so that when fingerprint recognition is performed, Only the organic electroluminescence structure of the fingerprint recognition area emits light.
  • the organic electroluminescent structure OLED when the light emission control signal EM is at a low potential, the organic electroluminescent structure OLED emits light under the driving of the power signal VDD. Therefore, by controlling the potential of the power signal VDD, the light emission of the organic electroluminescent structure OLED can be controlled.
  • an embodiment of the present disclosure further provides a driving method for driving any one of the foregoing OLED display panels, wherein the display and fingerprint recognition are driven in a time-sharing manner within a cycle;
  • the organic electroluminescent structure is driven to emit light line by line;
  • the organic electroluminescence structure in the fingerprint recognition area is driven to emit light, and fingerprint recognition is performed according to the output signal of the photosensitive unit.
  • the method for driving an OLED when fingerprint recognition is performed, only the organic electroluminescence structures in the fingerprint recognition area are driven to emit light, and all the organic electroluminescence structures in the non-fingerprint recognition area are illuminated to insert black, that is to avoid other The light in the area causes interference, thus achieving a fingerprint recognition function with a high signal-to-noise ratio.
  • all areas other than the fingerprint recognition area are inserted in black.
  • all areas other than the fingerprint recognition area are inserted in black, which can prevent the light emitted from other areas from reflecting to the photosensitive unit through other external objects, which will affect the detection of the light reflected by the finger from the photosensitive unit.
  • a time-sharing driving method is adopted, that is, the display and fingerprint recognition are driven by time-sharing.
  • the corresponding timing diagram is shown in FIG. 10, and HYSN is a Distinguish the time series of the display phase and the fingerprint identification phase within the frame time.
  • the shift register units E0A1 to EOA16 sequentially output the light emission control signals, where a low potential indicates that the organic electroluminescence structure emits light, and the power supply signals VDD1 and VDD2 corresponding to the entire display area are high potential signals to drive the display area.
  • the electroluminescent structure emits light.
  • the potentials of the light-emitting control signals output by EOA1 to EOA7 and EOA11 to EOA16 become high, and all the organic electroluminescence structures of the corresponding rows are to be blackened; for the organic electroluminescence structures controlled by EOA8 to EOA10
  • the power supply signal VDD1 corresponding to the P1 and P2 areas By directly pulling down the power supply signal VDD1 corresponding to the P1 and P2 areas, the power supply signal VDD2 corresponding to the A1 area is still high, so that the organic electroluminescence structure in the P1 and P2 areas is turned off, and only those in the fingerprint identification area are retained.
  • the electroluminescent structure emits light.
  • the OLED display panel provided in the embodiment of the present disclosure, during the fingerprint recognition phase, only the green light-emitting organic electroluminescent structure in the fingerprint recognition area is driven to emit light. This is because the brightness of the green organic electroluminescence structure is the highest, and while ensuring the brightness, the uniformity is also satisfied, thereby further improving the signal-to-noise ratio.
  • an embodiment of the present disclosure further provides a display device including any one of the foregoing OLED display panels provided by the embodiments of the present disclosure.
  • the display device may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a first light-shielding layer is provided between the photosensitive unit and the organic electroluminescence structure, and the first light-shielding layer is at least in an area corresponding to the fingerprint recognition area. Openwork area.
  • the light emitted by the organic electroluminescence structure is irradiated onto the photosensitive unit from the small hole through the reflection of the finger. Due to the difference in light brightness reflected by the finger valley, the fingerprint information of the finger is sensed. Since the small holes in the hollowed-out area can increase the concentration of light intensity, it can maximize the sensitivity of the finger when sensing.

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Abstract

本公开公开了一种OLED显示面板、其驱动方法及显示装置，在感光单元与有机电致发光结构之间设置第一遮光层，且第一遮光层至少在与指纹识别区域对应的区域为镂空区域。当有手指触控到屏幕时，有机电致发光结构发出的光线通过手指的反射从小孔照射到感光单元上，由于手指谷脊反射的光亮度存在差异，从而感测手指的指纹信息。由于镂空区域中的小孔能起到光强汇聚增加的作用，因此可以最大限度的增加手指触控时感应的灵敏度。

Description

OLED显示面板、其驱动方法及显示装置
相关申请的交叉引用
本申请要求在2018年06月29日提交中国专利局、申请号为201810716517.9、发明名称为“一种OLED显示面板、其驱动方法及显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及显示技术领域，尤指一种OLED显示面板、其驱动方法及显示装置。
背景技术
随着信息时代的到来，人们对信息安全越来越重视，指纹以其所包含信息的唯一性，在安全加密和信息识别中被广泛的应用，因此，指纹识别技术的发展也受到人们广泛的关注。
现有技术中，在显示装置中的指纹识别主要是通过在原有的像素的基础上增加红外发光亚像素和指纹光敏器件来实现在显示区域进行指纹识别，但是，在上述识别方式中，红外发光亚像素所发出的光经指纹进行反射后，可被很宽范围的多个指纹光敏器件接收，指纹谷、脊识别的灵敏度不高。
发明内容
本公开实施例提供一种OLED显示面板、其驱动方法及显示装置，用以提高指纹识别的灵敏度。
本公开实施例提供的一种OLED显示面板，包括：
显示区域，所述显示区域内设置有呈矩阵排列的多个有机电致发光结构；
指纹识别区域，所述指纹识别区域位于所述显示区域内，所述指纹识别区域内还设置有多个感光单元，且所述感光单元位于所述有机电致发光结构 的背光侧；
所述显示面板还包括：
第一遮光层，所述第一遮光层位于所述感光单元与所述有机电致发光结构之间，且所述第一遮光层至少在与所述指纹识别区域对应的区域为镂空区域，其中，所述第一遮光层的所述镂空区域具有多个贯穿所述第一遮光层的过孔，所述过孔位于与相邻所述有机电致发光结构之间的间隙所对应的区域。
可选地，在本公开实施例提供的OLED显示面板中，所述第一遮光层在与所述显示区域对应的区域均为镂空区域。
可选地，所述过孔的尺寸小于或等于所述有机电致发光结构的尺寸。
可选地，所述感光单元在所述第一遮光层的正投影覆盖至少一个所述过孔所在的区域。
可选地，相邻两个所述有机电致发光结构之间还设置有像素限定层，所述像素限定层在与所述过孔对应的位置处设置对应开口。
可选地，在本公开实施例提供的OLED显示面板中，所述显示区域还设置有与各所述有机电致发光结构电连接的像素电路；
所述第一遮光层位于所述像素电路与所述有机电致发光结构之间。
可选地，所述有机电致发光结构包括：阳极层；
所述像素电路包括薄膜晶体管，所述薄膜晶体管包括：有源层，以及位于所述有源层面向所述第一遮光层一面的源漏极层；
所述第一遮光层位于所述源漏极层与所述阳极层之间。
可选地，在本公开实施例提供的OLED显示面板中，所述显示区域还设置有与所述第一遮光层同层且绝缘设置的连接电极，所述像素电路通过所述连接电极与所述有机电致发光结构连接。
可选地，在本公开实施例提供的OLED显示面板中，所述显示区域还设置有信号线，所述第一遮光层与所述信号线在垂直所述显示面板的屏幕方向上不存在重叠区域。
可选地，所述信号线包括以下之一或组合：
数据线；
扫描线；
电源线。
可选地，在本公开实施例提供的OLED显示面板中，所述显示区域还设置有围绕多个所述感光单元设置的第二遮光层。
可选地，在本公开实施例提供的OLED显示面板中，所述显示区域还设置有衬底基板；
所述有机电致发光结构和所述第一遮光层位于所述衬底基板的一侧；
所述感光单元和所述第二遮光层位于所述衬底基板的另一侧。
可选地，在本公开实施例提供的OLED显示面板中，还包括栅极驱动电路；其中，
所述栅极驱动电路包括与各行所述有机电致发光结构对应的多个移位寄存单元；所述移位寄存单元用于向与对应行的所述有机电致发光结构电连接的像素电路提供发光控制信号；
所述栅极驱动电路中与所述指纹识别区域内的所述有机显示发光结构对应的移位寄存单元为第一移位寄存单元，其它移位寄存单元为第二移位寄存单元；各所述第一移位寄存单元电连接第一电源线，各所述第二移位寄存单元电连接第二电源线。
可选地，在本公开实施例提供的OLED显示面板中，所述感光单元包括光电二极管。
可选地，在本公开实施例提供的OLED显示面板中，所述显示面板还包括与各所述光电二极管电连接的信号读取单元；其中，所述信号读取单元包括：第一晶体管、第二晶体管、第三晶体管、第一电容、第二电容，运算放大器和控制开关；
所述第一晶体管的栅极与复位信号端电连接，所述第一晶体管的第一极与公共电压信号端电连接，所述第一晶体管的第二极分别与所述光电二极管的一端和所述第二晶体管的栅极电连接；
所述第二晶体管的第一极与电源电压端电连接，所述第二晶体管的第二极与所述第三晶体管的第一极电连接；
所述第三晶体管的栅极与控制端电连接，所述第三晶体管的第二极与所述运算放大器的负向输入端电连接；
所述运算放大器的正向输入端与参考信号端电连接，所述运算放大器的输出端用于读取信号；
所述第一电容电连接于所述第二晶体管的栅极与公共电压信号端之间；
所述第二电容电连接于所述运算放大器的负向输入端与输出端之间；
所述控制开关并联于所述第二电容的两端。
相应地，本公开实施例还提供了一种显示装置，包括本公开实施例提供的上述任一种OLED显示面板。
相应地，本公开实施例还提供了一种驱动上述OLED显示面板的驱动方法，在一个周期内显示和指纹识别分时进行驱动；其中，
在显示阶段，逐行驱动所述有机电致发光结构发光；
在指纹识别阶段，仅驱动所述指纹识别区域内的所述有机电致发光结构发光，并根据所述感光单元的输出信号进行指纹识别。
可选地，在本公开实施例提供的驱动方法中，在指纹识别阶段，仅驱动所述指纹识别区域内的发绿光的所述有机电致发光结构发光。
可选地，在指纹识别阶段，所述指纹识别区域以外的区域全部插黑。
本公开有益效果如下：
本公开实施例提供的上述OLED显示面板、其驱动方法及显示装置，在感光单元与有机电致发光结构之间设置第一遮光层，且第一遮光层至少在与指纹识别区域对应的区域为镂空区域。当有手指触控到屏幕时，有机电致发光结构发出的光线通过手指的反射从小孔照射到感光单元上，由于手指谷脊反射的光亮度存在差异，从而感测手指的指纹信息。由于镂空区域中的小孔能起到光强汇聚增加的作用，因此可以最大限度的增加手指触控时感应的灵敏度。
附图说明
图1为本公开实施例提供的OLED显示面板的俯视结构示意图；
图2为本公开实施例提供的OLED显示面板的局部剖面结构示意图；
图3为本公开实施例提供的OLED显示面板中第一遮光层的结构示意图；
图4为本公开实施例提供的OLED显示面板的一种结构示意图；
图5为本公开实施例提供的OLED显示面板中信号读取单元的结构示意图；
图6为图5所示信号读取单元对应的时序图；
图7为本公开实施例提供的OLED显示面板的一种结构示意图；
图8为本公开实施例提供的一种移位寄存单元的结构示意图；
图9为本公开实施例提供的一种像素电路的结构示意图；
图10为本公开实施例提供的OLED显示面板的驱动时序图。
具体实施方式
本公开实施例提供了一种OLED显示面板、其驱动方法及显示装置，为了使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开作进一步地详细描述，显然，所描述的实施例仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本公开保护的范围。
附图中各部件的形状和大小不反映真实比例，目的只是示意说明本公开内容。
本公开实施例提供的一种OLED显示面板，如图1和图2所示，显示面板包括：
显示区域内A，显示区域A内设置有呈矩阵排列的多个有机电致发光结构01；
指纹识别区域A1，指纹识别区域A1位于显示区域A内，指纹识别区域 A1内还设置有多个感光单元02，且感光单元02位于有机电致发光结构01的背光侧；
显示面板还包括：
第一遮光层03，第一遮光层03位于感光单元02与有机电致发光结构01之间，且第一遮光层03至少在与指纹识别区域A1对应的区域为镂空区域，其中，第一遮光层03的镂空区域具有多个贯穿第一遮光层03的过孔031，如图2所示，过孔031位于与相邻有机电致发光结构01之间的间隙所对应的区域，在垂直与第一遮光层03的方向上，过孔031与相邻有机电致发光结构01之间的间隙存在交叠区域。
本公开实施例提供的OLED显示面板，在感光单元与有机电致发光结构之间设置第一遮光层，且第一遮光层至少在与指纹识别区域对应的区域为镂空区域，过孔位于与相邻有机电致发光结构之间的间隙所对应的区域。当有手指触控到屏幕时，有机电致发光结构发出的光线通过手指的反射从小孔照射到感光单元上，由于手指谷脊反射的光亮度存在差异，从而感测手指的指纹信息。由于镂空区域中的小孔能起到光强汇聚增加的作用，因此可以最大限度的增加手指触控时感应的灵敏度。
在具体实施时，当第一遮光层仅在与指纹识别区域对应的区域为镂空区域时，指纹识别区域与其它显示区域在显示时会存在差异。因此，可选地，在本公开实施例提供的OLED显示面板中，如图3所示，第一遮光层03在与显示区域A对应的区域均为镂空区域。
具体实施时，在本公开实施例提供的OLED显示面板中，镂空区域内一个过孔可以对应一个有机电致发光结构，也可以对应多个有机电致发光结构，或者，一个过孔可以对应一个感光单元，也可以对应多个感光单元，过孔的大小根据识别精度进行设定，精度越高，过孔数量越多，过孔面积越小，在此不作限定。
可选地，过孔031的尺寸小于或等于有机电致发光结构01的尺寸。本发明实施例中，在第一遮光层开与尺寸小于或等于有机电致发光结构01尺寸的 小孔，以在工艺可以实现制作小孔的前提下，使显示面板具有较高的指纹识别精度。
可选地，感光单元02在第一遮光层03的正投影覆盖至少一个过孔031所在的区域。由于一般指纹识别的精度要小于像素的精度，即，感光单元02的尺寸要大于有机电致发光结构01的尺寸，在过孔031位于相邻有机电致发光结构01之间时，进而在与一个感光单元02对应的位置可以设置多个过孔031。
可选地，参见图2所示，相邻两个有机电致发光结构01之间还设置有像素限定层114，像素限定层114在与过孔031对应的位置处设置对应开口。本发明实施例中，在像素限定层114与过孔031对应的位置处也设置对应开口，可以降低像素限定层114对光的遮挡，提高光入射到感光单元02的光的强度。
可选地，在本公开实施例提供的OLED显示面板中，如图2所示，显示区域还设置有与各有机电致发光结构01电连接的像素电路04；
第一遮光层03位于像素电路04与有机电致发光结构01之间。
可选的，有机电致发光结构01包括：阳极层；
像素电路04包括薄膜晶体管，薄膜晶体管包括：有源层，以及位于有源层面向第一遮光层03一面的源漏极层；第一遮光层03具体可以位于源漏极层与阳极层之间。
可选地，在本公开实施例提供的OLED显示面板中，显示区域还设置有与第一遮光层同层且绝缘设置的连接电极，像素电路通过连接电极与有机电致发光结构连接。这样可以避免在有机电致发光结构与像素电路电连接时挖孔较深，利用电连接电极直接将有机电致发光结构与像素电路电连接。并且电连接电极与第一遮光层同层设置，可以采用一次构图工艺形成第一遮光层和电连接电极的图形，不用增加构图工艺。
可选地，在本公开实施例提供的OLED显示面板中，显示区域还设置有信号线，第一遮光层与信号线在垂直显示面板的屏幕方向上不存在重叠区域。即第一遮光层与信号线不存在正对面积，这样第一遮光层与信号线不能形成 电容，从而减少信号线上的Loading。
在具体实施时，信号线一般包括数据线、扫描线、电源线之一或其组合等，只要是位于显示区域内导线，均在信号线的范畴内，在此不作限定。
在具体实施时，在本公开实施例提供的OLED显示面板中，为了降低第一遮光层与信号线之间的Loading，可以增加第一遮光层与信号线之间膜层的厚度。
可选地，在本公开实施例提供的OLED显示面板中，如图2所示，显示区域还设置有围绕多个感光单元02设置的第二遮光层05。这样可以避免侧面的光影响感光单元。
可选地，在本公开实施例提供的OLED显示面板中，显示区域还设置有衬底基板；有机电致发光结构和第一遮光层位于衬底基板的一侧；感光单元和第二遮光层位于衬底基板的另一侧。即相当于将感光单元后置于衬底基板。当然，在具体实施时，感光单元也可以与有机电致发光结构位于衬底基板的同一侧，在此不作限定。
在具体实施时，当将感光单元后置于衬底基板上时，一般是将感光单元先形成在芯片上，然后再将芯片与衬底基板进行组合。
在具体实施时，衬底基板可以是柔性基板，当然也可以是玻璃等材质的硬基板，在此不作限定。
在具体实施时，像素电路一般包括驱动晶体管、开关晶体管等，像素电路通过驱动晶体管与有机电致发光结构电连接。晶体管一般包括栅极、源极、漏极和有源层。有机电致发光结构一般包括依次层叠设置的阳极层、发光层和阴极层。
下面以一个具体的实施例说明本公开实施例提供的OLED显示面板。如图4所示，在OLED显示面板中，在衬底基板100上依次设置有缓冲层101、有源层102、栅极绝缘层103、栅极104、层间介质层105、源极106、漏极107、第一平坦化层108、同层设置的连接电极109和第一遮光层03、第二平坦化层110、阳极层111、发光层112、阴极层113、像素限定层114和封装层 115。在衬底基板100的另一侧设置有第二遮光层05和感光单元02。其中，由阳极层111、发光层112和阴极层113构成的有机电致发光结构01通过连接电极109与漏极107电连接，第一遮光层03具有过孔031，有机电致发光结构01发出的光线通过手指的反射从过孔031照射到感光单元02上，由于手指谷脊反射的光亮度存在差异，从而感测手指的指纹信息。由于过孔031能起到光强汇聚增加的作用，因此可以最大限度的增加手指触控时感应的灵敏度。在图4中，将感光单元02后置于衬底基板100上，在具体实施时，一般是将感光单元02先形成在芯片200上，然后再将芯片200与衬底基板100进行组合。其中，图4是以芯片200中的其中一个感光单元02为例进行示意的。
另外，在具体实施时，晶体管可以为顶栅型结构，也可以为底栅型结构，或者其他结构，在此不作限定，图4是以顶栅型结构为例。OLED显示面板具体可以为顶发射型OLED显示面板，即，显示的光向上进行出射，阳极层111具体可以为反射型阳极。由于顶发射的OLED显示面板基本都是采用微腔(cavity)的结构，所以这本公开在第一遮光层进行开孔以进行聚光是十分必要的。
进一步地，在具体实施时，晶体管可以是图4所示的单栅结构，根据实际要求，也可以设计为双栅等多栅结构，在此不作限定。
可选地，在本公开实施例提供的OLED显示面板中，感光单元一般包括光电二极管。
可选地，在本公开实施例提供的OLED显示面板中，如图5所示，显示面板还包括与各光电二极管PIN电连接的信号读取单元201；其中，信号读取单元201包括：第一晶体管T1、第二晶体管T2、第三晶体管T3、第一电容C1、第二电容C2，运算放大器A和控制开关K1；
第一晶体管T1的栅极与复位信号端Reset电连接，第一晶体管T1的第一极与公共电压信号端Vcom电连接，第一晶体管T1的第二极分别与光电二极管PIN的阳极和第二晶体管T2的栅极电连接；
第二晶体管T2的第一极与电源电压端Vdd电连接，第二晶体管T2的第二极与第三晶体管T3的第一极电连接；
第三晶体管T3的栅极与控制端EM电连接，第三晶体管T3的第二极与运算放大器A的负向输入端电连接；
运算放大器A的正向输入端与参考信号端Vref电连接，运算放大器A的输出端用于读取信号；
第一电容C1电连接于第二晶体管T2的栅极与公共电压信号端Vcom之间；
第二电容C2电连接于运算放大器A的负向输入端与输出端之间；
控制开关K1并联于第二电容C2的两端。
具体地，光电二极管PIN的阴极与固定电位端Vd电连接。
具体地，本公开实施例提供的OLED显示面板中，通过图5所示的信号读取单元进行指纹识别，该信号读取单元可以设置在芯片上，当然也可以将部分晶体管集成在衬底基板上，在此不作限定。
进一步地，图5所示的信号读取单元对应的时序图如图6所示，具体工作原理为：复位信号端Reset控制第一晶体管T1导通，对N1节点的电位进行复位，利用光电二极管PIN反接，光电二极管PIN接收的光强越多，第一节点N1的电位控制第二晶体管T2产生的电流越大，当控制端EM控制第三晶体管导通时，第二晶体管T2输出的电流通过第三晶体管T3后经运算放大器A放大后输出，从而通过读取运算放大器A的输出端的信号可以判断指纹脊或谷。
当然，在具体实施时，信号读取单元的具体结构不限于此，还可以是能够实现上述读取信号的其它结构，在此不作限定。
可选地，在本公开实施例提供的OLED显示面板中，如图7所示，还包括栅极驱动电路300；其中，
栅极驱动电路300包括与各行有机电致发光结构01对应的多个移位寄存单元EOAn，n＝1、2、3、…N，图7是以N＝17为例进行说明的；移位寄存单 元EOAn用于向与对应行的有机电致发光结构电连接的像素电路提供发光控制信号；
栅极驱动电路300中与指纹识别区域A1内的有机显示发光结构01对应的移位寄存单元EOA8～EOA10为第一移位寄存单元，其它移位寄存单元EOA1～EOA7、EOA11～EOA16为第二移位寄存单元；各第一移位寄存单元EOA8～EOA10电连接第一电源线VG1，各第二移位寄存单元EOA1～EOA7、EOA11～EOA16电连接第二电源线VG2。
在具体实施时，移位寄存单元一般通过与其电连接的电源线来控制输出的发光控制信号的电位，当发光控制信号的有效电位为高电位时(即发光控制信号为高电位时有机电致发光结构发光)，移位寄存单元一般电连接的电源线用于传输高电位信号；当发光控制信号的有效电位为低电位时，移位寄存单元一般电连接的电源线用于传输低电位信号。以图8所示的移位寄存单元为例，移位寄存单元通过电源线VGL来控制发光控制信号的电位。
目前，现有的栅极驱动电路中，所有移位寄存单元均电连接的是同一电源线，同样以图8所示移位寄存单元为例，栅极驱动电路中所有移位寄存单元均与电源线VGL电连接，这样不能实现分区域控制。
因此，本公开实施例中，将栅极驱动电路中的第一移位寄存单元电连接第一电源线，第二移位寄存单元电连接第二电源线，可以将指纹识别区域的有机电致发光结构与其它区域的有机电致发光结构进行分别控制，从而在进行指纹识别时，显示区域的非指纹识别区域全部插黑。即在进行指纹识别时，仅有指纹识别区域的有机电致发光结构发光，其它区域的有机电致发光结构均关闭，这样可以提高指纹识别的信噪比。当然，图7所示的栅极驱动电路仅是本公开实施例提供的用于实现在指纹识别时，对显示区域的非指纹识别区域全部进行插黑的一种实施方式，本公开不限于此，栅极驱动电路还可以有能实现上述功能的其它实施方式。
进一步地，在本公开实施例提供的OLED显示面板中，可以单边驱动的方法，即如图7所示，栅极驱动电路300仅设置在一侧。当然，当面板尺寸 较大时，为改善由于loading导致的信号失真，也可以采用双边驱动的方法，即栅极驱动电路300设置在两侧，在此不作限定。
在具体实施时，在本公开实施例提供的OLED显示面板中，如图7所示，还包括用于向像素电路提供电源信号的源驱动电路400，当在进行指纹识别时，通过栅极驱动器300向指纹识别区域对应行的有机电致发光结构01电连接的像素电路发送发光控制信号，通过源驱动电路400向指纹识别区域对应列的像素电路发送电源信号，从而可以实现在进行指纹识别时，仅有指纹识别区域的有机电致发光结构发光。
以图9所示的像素电路为例，当发光控制信号EM为低电位时，在电源信号VDD的驱动下，有机电致发光结构OLED发光。因此通过控制电源信号VDD的电位，可以控制有机电致发光结构OLED的发光。
下面结合OLED的驱动方法进行详细的说明。
基于同一发明构思，本公开实施例还提供了一种驱动上述任一OLED显示面板的驱动方法，其中，在一个周期内显示和指纹识别分时进行驱动；
在显示阶段，逐行驱动有机电致发光结构发光；
在指纹识别阶段，仅驱动指纹识别区域内的有机电致发光结构发光，并根据感光单元的输出信号进行指纹识别。
本公开实施例提供的OLED的驱动方法，在进行指纹识别时，仅驱动指纹识别区域内的有机电致发光结构发光，非指纹识别区域内的有机电致发光结构发光全部插黑，即避免其他区域的光造成干扰，从而实现高信噪比的指纹识别功能。
可选的，在指纹识别阶段，指纹识别区域以外的区域全部插黑。在指纹识别阶段，指纹识别区域以外的区域全部插黑，可以避免其它区域发出的光线经外界其它物体也反射到感光单元时，影响感光单元对经手指反射的光的检测。
如图7所示，以指纹识别区域A1位于显示区域A中间为例，采用分时驱动方式，即显示和指纹识别是分时进行驱动的，对应的时序图如图10所示， HYSN是一帧时间内区分显示阶段和指纹识别阶段的时序分布。在显示阶段，移位寄存单元E0A1～EOA16依次输出发光控制信号，其中低电位表示有机电致发光结构发光，显示区域整体对应的电源信号VDD1和VDD2均为高电位信号，以驱动显示区域的有机电致发光结构发光。在指纹识别阶段，EOA1～EOA7、EOA11～EOA16输出的发光控制信号的电位变为高电位，对应行的有机电致发光结构全部要被拉黑；对于由EOA8～EOA10控制的有机电致发光结构，通过将P1和P2区域对应的电源信号VDD1直接拉低，A1区域对应的电源信号VDD2仍为高电位，从而使P1和P2区域的有机电致发光结构关闭，仅保留指纹识别区域内的有机电致发光结构发光。
可选地，在本公开实施例提供的OLED显示面板中，在指纹识别阶段，仅驱动指纹识别区域内的发绿光的有机电致发光结构发光。这是因为绿色的有机电致发光结构的亮度是最高的，能够在保证亮度的同时，均一性也得到满足，从而进一步提高信噪比。
基于同一发明构思，本公开实施例还提供了一种显示装置，包括本公开实施例提供的上述任一种OLED显示面板。该显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。该显示装置的实施可以参见上述OLED显示面板的实施例，重复之处不再赘述。
本公开实施例提供的上述OLED显示面板、其驱动方法及显示装置，在感光单元与有机电致发光结构之间设置第一遮光层，且第一遮光层至少在与指纹识别区域对应的区域为镂空区域。当有手指触控到屏幕时，有机电致发光结构发出的光线通过手指的反射从小孔照射到感光单元上，由于手指谷脊反射的光亮度存在差异，从而感测手指的指纹信息。由于镂空区域中的小孔能起到光强汇聚增加的作用，因此可以最大限度的增加手指触控时感应的灵敏度。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要 求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (19)

  1. 一种OLED显示面板，包括：
    显示区域，所述显示区域内设置有呈矩阵排列的多个有机电致发光结构；
    指纹识别区域，所述指纹识别区域位于所述显示区域内，所述指纹识别区域内还设置有多个感光单元，且所述感光单元位于所述有机电致发光结构的背光侧；
    所述显示面板还包括：
    第一遮光层，所述第一遮光层位于所述感光单元与所述有机电致发光结构之间，且所述第一遮光层至少在与所述指纹识别区域对应的区域为镂空区域，其中，所述第一遮光层的所述镂空区域具有多个贯穿所述第一遮光层的过孔，所述过孔位于与相邻所述有机电致发光结构之间的间隙所对应的区域。
  2. 如权利要求1所述的OLED显示面板，所述第一遮光层在与所述显示区域对应的区域均为镂空区域。
  3. 如权利要求1所述的OLED显示面板，所述过孔的尺寸小于或等于所述有机电致发光结构的尺寸。
  4. 如权利要求3所述的OLED显示面板，所述感光单元在所述第一遮光层的正投影覆盖至少一个所述过孔所在的区域。
  5. 如权利要求1所述的OLED显示面板，相邻两个所述有机电致发光结构之间还设置有像素限定层，所述像素限定层在与所述过孔对应的位置处设置对应开口。
  6. 如权利要求1所述的OLED显示面板，所述显示区域还设置有与各所述有机电致发光结构电连接的像素电路；
    所述第一遮光层位于所述像素电路与所述有机电致发光结构之间。
  7. 如权利要求6所述的OLED显示面板，所述有机电致发光结构包括：阳极层；
    所述像素电路包括薄膜晶体管，所述薄膜晶体管包括：有源层，以及位 于所述有源层面向所述第一遮光层一面的源漏极层；
    所述第一遮光层位于所述源漏极层与所述阳极层之间。
  8. 如权利要求1所述的OLED显示面板，所述显示区域还设置有与所述第一遮光层同层且绝缘设置的连接电极，所述像素电路通过所述连接电极与所述有机电致发光结构连接。
  9. 如权利要求1所述的OLED显示面板，所述显示区域还设置有信号线，所述第一遮光层与所述信号线在垂直所述显示面板的屏幕方向上不存在重叠区域。
  10. 如权利要求9所述的OLED显示面板，所述信号线包括以下之一或组合：
    数据线；
    扫描线；
    电源线。
  11. 如权利要求1所述的OLED显示面板，所述显示区域还设置有围绕多个所述感光单元设置的第二遮光层。
  12. 如权利要求11所述的OLED显示面板，所述显示区域还设置有衬底基板；
    所述有机电致发光结构和所述第一遮光层位于所述衬底基板的一侧；
    所述感光单元和所述第二遮光层位于所述衬底基板的另一侧。
  13. 如权利要求6所述的OLED显示面板，还包括栅极驱动电路；其中，
    所述栅极驱动电路包括与各行所述有机电致发光结构对应的多个移位寄存单元；所述移位寄存单元用于向与对应行的所述有机电致发光结构电连接的像素电路提供发光控制信号；
    所述栅极驱动电路中与所述指纹识别区域内的所述有机显示发光结构对应的移位寄存单元为第一移位寄存单元，其它移位寄存单元为第二移位寄存单元；各所述第一移位寄存单元电连接第一电源线，各所述第二移位寄存单元电连接第二电源线。
  14. 如权利要求1-13任一项所述的OLED显示面板，所述感光单元包括光电二极管。
  15. 如权利要求14所述的OLED显示面板，所述显示面板还包括与各所述光电二极管电连接的信号读取单元；其中，所述信号读取单元包括：第一晶体管、第二晶体管、第三晶体管、第一电容、第二电容，运算放大器和控制开关；
    所述第一晶体管的栅极与复位信号端电连接，所述第一晶体管的第一极与公共电压信号端电连接，所述第一晶体管的第二极分别与所述光电二极管的一端和所述第二晶体管的栅极电连接；
    所述第二晶体管的第一极与电源电压端电连接，所述第二晶体管的第二极与所述第三晶体管的第一极电连接；
    所述第三晶体管的栅极与控制端电连接，所述第三晶体管的第二极与所述运算放大器的负向输入端电连接；
    所述运算放大器的正向输入端与参考信号端电连接，所述运算放大器的输出端用于读取信号；
    所述第一电容电连接于所述第二晶体管的栅极与公共电压信号端之间；
    所述第二电容电连接于所述运算放大器的负向输入端与输出端之间；
    所述控制开关并联于所述第二电容的两端。
  16. 一种显示装置，包括如权利要求1-15任一项所述的OLED显示面板。
  17. 一种驱动如权利要求1-15任一项所述的OLED显示面板的驱动方法，其中，在一个周期内显示和指纹识别分时进行驱动；其中，
    在显示阶段，逐行驱动所述有机电致发光结构发光；
    在指纹识别阶段，仅驱动所述指纹识别区域内的所述有机电致发光结构发光，并根据所述感光单元的输出信号进行指纹识别。
  18. 如权利要求17所述的驱动方法，在指纹识别阶段，仅驱动所述指纹识别区域内的发绿光的所述有机电致发光结构发光。
  19. 如权利要求18所述的驱动方法，在指纹识别阶段，所述指纹识别区 域以外的区域全部插黑。
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