WO2021203479A1 - 像素驱动电路和显示面板 - Google Patents

像素驱动电路和显示面板 Download PDF

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Publication number
WO2021203479A1
WO2021203479A1 PCT/CN2020/085950 CN2020085950W WO2021203479A1 WO 2021203479 A1 WO2021203479 A1 WO 2021203479A1 CN 2020085950 W CN2020085950 W CN 2020085950W WO 2021203479 A1 WO2021203479 A1 WO 2021203479A1
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WIPO (PCT)
Prior art keywords
transistor
point
module
detection
signal
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PCT/CN2020/085950
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English (en)
French (fr)
Inventor
王利民
黄泰钧
王振岭
Original Assignee
深圳市华星光电半导体显示技术有限公司
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Application filed by 深圳市华星光电半导体显示技术有限公司 filed Critical 深圳市华星光电半导体显示技术有限公司
Priority to US16/760,494 priority Critical patent/US11626071B2/en
Publication of WO2021203479A1 publication Critical patent/WO2021203479A1/zh

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    • 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
    • G—PHYSICS
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    • 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]
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    • 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
    • G09G3/3258—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 voltage across the light-emitting element
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    • 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]
    • 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
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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    • 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
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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    • 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
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
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    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • 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
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    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage
    • G—PHYSICS
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    • 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
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
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    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
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    • G—PHYSICS
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    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Definitions

  • This application relates to the field of display technology, and in particular to a pixel drive circuit and a display panel.
  • the cathode of the light-emitting device corresponding to each sub-pixel is connected to the power supply low-potential signal VSS, and the anode is respectively connected to the 3T1C pixel driving circuit, where the driving transistor in the pixel driving circuit is used for When driving the light-emitting device to emit light, the threshold voltage Vth of the driving transistor will drift due to various reasons. Therefore, it is usually during the first detection period between power-on or after power-off, and the second detection period between adjacent display frames.
  • the threshold voltage Vth of the driving transistor is comprehensively compensated.
  • the cathodes of light-emitting devices at different positions on the panel have different distances to the input terminal of the power low-potential signal VSS, and the voltage of the cathode farther from the input terminal is less than the voltage of the cathode closer to the input terminal, that is, Power supply voltage drop (IR-Drop) phenomenon causes a difference in the voltage difference between the cathode and anode at both ends of different light-emitting devices. The farther away from the input terminal, the smaller the voltage difference, which will eventually lead to uneven display brightness.
  • IR-Drop Power supply voltage drop
  • the existing display panel has a technical problem of uneven brightness of the screen, which needs to be improved.
  • the embodiments of the present application provide a pixel driving circuit and a display panel to alleviate the technical problem of uneven brightness of the screen in the existing display panel.
  • An embodiment of the present application provides a pixel driving circuit, including:
  • the data signal input module is used for the first detection time period, and under the control of the first control signal, the first data signal is input to the first point, and the first detection time period is the non-display before the power-on or after the power-off period;
  • a light emitting device the anode of the light emitting device is connected to the first power signal input terminal;
  • the drive module the first input end of the drive module is connected to the data signal input module through the first point, the second input end of the drive module is connected to the second power signal input end, the drive module
  • the output terminal is connected to the cathode of the light-emitting device, and the driving module is configured to drive the light-emitting device to emit light under the control of a second control signal and the potential of the first point;
  • the detection module is connected to the third input terminal of the driving module through a second point, and is connected to the output terminal of the driving module through a third point, and is used to connect to the third input terminal of the driving module during the first detection phase period. Under the control of the control signal, the first threshold voltage of the driving module is detected. During the second detection period, under the control of the fourth control signal, the second threshold voltage of the driving module is detected. 2.
  • the detection time period is the blank time period between adjacent display frames;
  • a storage module connected to the driving module through the first point and the second point, and used for storing the first threshold voltage and the second threshold voltage of the driving module;
  • the data input module is further configured to, according to the first threshold voltage detected by the detection module, input the compensated second point to the first point during the data writing stage of the display time period.
  • Data signal; the driving module is also used to, according to the second data signal and the second threshold voltage detected by the detection module, in the light-emitting stage of the display period, input driving to the light-emitting device
  • the driving current has nothing to do with the values of the first threshold voltage and the second threshold voltage; in the first detection period, the first power signal input terminal is connected to a power low potential signal, so The second power signal input terminal is connected to a power high potential signal.
  • the first power signal input terminal is connected to a power high potential signal, and the second power supply The signal input terminal is connected to a power low-potential signal, and during the light-emitting stage of the display period, in the pixel driving circuits corresponding to different sub-pixels, the voltage values of the output terminals of the driving module are all within a preset range.
  • the data signal input module includes a first transistor, the gate of the first transistor is connected to the first control signal, and the first electrode of the first transistor is connected to the data line , The second electrode of the first transistor is connected to the first point.
  • the light-emitting device includes a light-emitting diode or an organic light-emitting diode.
  • the driving module includes a second transistor and a third transistor, the gate of the second transistor is connected to the first point, and the first electrode of the second transistor is connected to the The second electrode of the third transistor is connected to the second point, the second electrode of the second transistor and the cathode of the light-emitting device are connected to the third point, and the gate of the third transistor is connected to the For the second control signal, the first electrode of the third transistor is connected to the second power signal input terminal.
  • the detection module includes a fourth transistor, a fifth transistor, a sensing line, and a selection switch, the gate of the fourth transistor is connected to the third control signal, and the first The first electrode of the four transistor is connected to the sensing line, the second electrode of the fourth transistor is connected to the third point, the gate of the fifth transistor is connected to the fourth control signal, the The first electrode of the fifth transistor is connected to the sensing line, the second electrode of the fifth transistor is connected to the second point, the movable contact of the selection switch is connected to the sensing line, the The first static contact of the selection switch is connected with the control voltage input terminal, and the second static contact of the selection switch is connected with the analog-to-digital converter.
  • the storage module includes a storage capacitor, a first plate of the storage capacitor is connected to the first point, and a second plate of the storage capacitor is connected to the second point .
  • the third control signal is at a high level
  • the fourth control signal is at a low level
  • the first detection period includes an initialization phase, a charging phase, and a first detection phase.
  • the detection module is used to control the selection switch during the initialization phase.
  • the moving contact is connected to the first static contact.
  • the moving contact that controls the selector switch is disconnected from both the first and second static contacts.
  • the movable contact of the control switch is connected to the second static contact.
  • the control voltage input terminal inputs a reference voltage signal.
  • the second detection period includes a reset phase and a second detection phase.
  • the third control signal is at a low level
  • the fourth control signal is At a high level
  • the third control signal and the fourth control signal are both at a low level.
  • the detection module is used for controlling the connection of the movable contact of the selection switch with the first static contact in the reset phase.
  • the control voltage input terminal inputs an initial voltage signal.
  • the data input module is used to input the compensated point to the first point according to the first threshold voltage detected by the detection module in the second detection stage The reference data signal.
  • the third control signal and the fourth control signal are both low potentials.
  • the present application also provides a display panel, which includes a pixel drive circuit, and the pixel drive circuit includes:
  • the data signal input module is used for the first detection time period, and under the control of the first control signal, the first data signal is input to the first point, and the first detection time period is the non-display before the power-on or after the power-off period;
  • a light emitting device the anode of the light emitting device is connected to the first power signal input terminal;
  • the drive module the first input end of the drive module is connected to the data signal input module through the first point, the second input end of the drive module is connected to the second power signal input end, the drive module
  • the output terminal is connected to the cathode of the light-emitting device, and the driving module is configured to drive the light-emitting device to emit light under the control of a second control signal and the potential of the first point;
  • the detection module is connected to the third input terminal of the driving module through a second point, and is connected to the output terminal of the driving module through a third point, and is used to connect to the third input terminal of the driving module during the first detection phase period. Under the control of the control signal, the first threshold voltage of the driving module is detected. During the second detection period, under the control of the fourth control signal, the second threshold voltage of the driving module is detected. 2.
  • the detection time period is the blank time period between adjacent display frames;
  • a storage module connected to the driving module through the first point and the second point, and used for storing the first threshold voltage and the second threshold voltage of the driving module;
  • the data input module is further configured to, according to the first threshold voltage detected by the detection module, input the compensated second point to the first point during the data writing stage of the display time period.
  • Data signal; the driving module is also used to, according to the second data signal and the second threshold voltage detected by the detection module, in the light-emitting stage of the display period, input driving to the light-emitting device
  • the driving current has nothing to do with the values of the first threshold voltage and the second threshold voltage; in the first detection period, the first power signal input terminal is connected to a power low potential signal, so The second power signal input terminal is connected to a power high potential signal.
  • the first power signal input terminal is connected to a power high potential signal, and the second power supply The signal input terminal is connected to a power low-potential signal, and during the light-emitting stage of the display period, in the pixel driving circuits corresponding to different sub-pixels, the voltage values of the output terminals of the driving module are all within a preset range.
  • the data signal input module includes a first transistor, the gate of the first transistor is connected to the first control signal, and the first electrode of the first transistor is connected to a data line, The second electrode of the first transistor is connected to the first point.
  • the light emitting device includes a light emitting diode or an organic light emitting diode.
  • the driving module includes a second transistor and a third transistor, the gate of the second transistor is connected to the first point, and the first electrode of the second transistor is connected to the first point.
  • the second electrode of the three transistor is connected to the second point, the second electrode of the second transistor and the cathode of the light-emitting device are connected to the third point, and the gate of the third transistor is connected to the For the second control signal, the first electrode of the third transistor is connected to the second power signal input terminal.
  • the detection module includes a fourth transistor, a fifth transistor, a sensing line, and a selection switch, the gate of the fourth transistor is connected to the third control signal, and the fourth transistor
  • the first electrode of the transistor is connected to the sensing line
  • the second electrode of the fourth transistor is connected to the third point
  • the gate of the fifth transistor is connected to the fourth control signal.
  • the first electrode of the five transistor is connected to the sensing line
  • the second electrode of the fifth transistor is connected to the second point
  • the movable contact of the selection switch is connected to the sensing line
  • the first static contact of the switch is connected with the control voltage input terminal
  • the second static contact of the selector switch is connected with the analog-to-digital converter.
  • the storage module includes a storage capacitor, a first plate of the storage capacitor is connected to the first point, and a second plate of the storage capacitor is connected to the second point.
  • the embodiments of the application provide a pixel drive circuit and a display panel.
  • the pixel drive circuit includes a data signal input module, a light emitting device, a drive module, a detection module, and a storage module; the data signal input module is used for the first In the detection time period, the first data signal is input to the first point under the control of the first control signal.
  • the first detection time period is the non-display time period before or after the shutdown; the anode of the light-emitting device and the first power supply
  • the signal input terminal is connected; the first input terminal of the drive module is connected with the data signal input module through the first point, the second input terminal of the drive module is connected with the second power signal input terminal, and the output terminal of the drive module is connected with the cathode of the light emitting device ,
  • the driving module is used to drive the light-emitting device to emit light under the control of the second control signal and the potential of the first point;
  • the detection module is connected to the third input terminal of the driving module through the second point, and the output of the driving module through the third point Terminal connection for detecting the first threshold voltage of the driving module under the control of the third control signal during the first detection period, and under the control of the fourth control signal during the second detection period,
  • the second threshold voltage of the driving module is detected, and the second detection time period is the blank time period between adjacent display frames;
  • the storage module is connected to
  • the data input module is also used to input the compensated first point to the first point during the data writing stage of the display period according to the first threshold voltage detected by the detection module Two data signals; the driving module is also used to, according to the second data signal and the second threshold voltage detected by the detection module, input the driving current to the light-emitting device during the light-emitting stage of the display period, the driving current and the first threshold voltage It has nothing to do with the value of the second threshold voltage; in the first detection period, the first power signal input terminal is connected to the power low-level signal, and the second power signal input terminal is connected to the power high-level signal, and in the second detection period In the display time period, the first power signal input terminal is connected to the power high potential signal, and the second power signal input terminal is connected to the power low potential signal.
  • the voltage values of the output terminals of the drive module are all in the preset range.
  • the anodes of all light-emitting devices in the display panel are connected together, and the cathodes are connected to the output terminal of the driving module.
  • the output terminal of the driving module The voltage values are all in the preset range, that is, the voltage values of the cathodes of the light-emitting devices located at different positions of the display panel are in the preset range, so each light-emitting device is less affected by the voltage drop of the power supply, so that the display brightness of the display panel is uniform.
  • the anode of the light-emitting device is connected to the low-potential signal of the power supply, which can directly cut off the light-emitting device, avoiding the leakage of the light-emitting device to the detection module, thereby improving the detection accuracy.
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit provided by an embodiment of the application.
  • FIG. 2 is a schematic diagram of the switching of each transistor in the first detection period of the pixel driving circuit provided by an embodiment of the application.
  • FIG. 3 is a timing diagram of various signals in the first detection period of the pixel driving circuit provided by an embodiment of the application.
  • FIG. 4 is a schematic diagram of the switching of each transistor in the reset stage of the second detection period of the pixel driving circuit provided by the embodiment of the application.
  • FIG. 5 is a schematic diagram of the switching of each transistor in the second detection stage of the second detection period and the data writing stage of the display period of the pixel driving circuit according to an embodiment of the application.
  • FIG. 6 is a schematic diagram of the switching of each transistor in the light-emitting stage of the display period of the pixel driving circuit provided by the embodiment of the application.
  • FIG. 7 is a timing diagram of various signals in the second detection period and the display period of the pixel driving circuit provided by an embodiment of the application.
  • FIG. 8 is a schematic diagram of a process of comprehensive compensation of a pixel driving circuit provided by an embodiment of the application.
  • the embodiments of the present application provide a pixel driving circuit and a display panel to alleviate the technical problem of uneven brightness of the screen in the existing display panel.
  • the pixel driving circuit includes a data signal input module 201, a light emitting device 202, a driving module 203, a detection module 204, and a storage module 205;
  • the data signal input module 201 is used for the first detection time period. Under the control of the first control signal WR, the first data signal is input to the first point A.
  • the first detection time period is the non-display before the power-on or after the power-off period;
  • the anode of the light emitting device 202 is connected to the first power signal input terminal V+;
  • the first input terminal of the driving module 203 is connected to the data signal input module 201 through the first point A, the second input terminal of the driving module 203 is connected to the second power signal input terminal V-, and the output terminal of the driving module 203 is connected to the light emitting device 202
  • the driving module 203 is used to drive the light-emitting device 203 to emit light under the control of the second control signal EM and the potential of the first point A;
  • the detection module 204 is connected to the third input terminal of the driving module 203 through the second point B, and is connected to the output terminal of the driving module 203 through the third point C, and is used for the third control signal during the first detection phase period.
  • the first threshold voltage Vth of the driving module 203 is detected
  • the second detection period is the blank period between adjacent display frames;
  • the storage module 205 is connected to the driving module 203 through the first point A and the second point B, and is used for storing the first threshold voltage Vth and the second threshold voltage Vth' of the driving module 203;
  • the data input module 201 is further configured to input the compensated second data signal to the first point A according to the first threshold voltage Vth detected by the detection module 204 during the data writing stage of the display period;
  • the module 203 is also used to, according to the second data signal and the second threshold voltage Vth' detected by the detection module 204, input a driving current to the light-emitting device 202 during the light-emitting stage of the display period, the driving current and the first threshold voltage Vth has nothing to do with the value of the second threshold voltage Vth'; in the first detection period, the first power signal input terminal V+ is connected to the power low-level signal VSS, and the second power signal input terminal V- is connected to the power high-level signal VDD In the second detection period and the display period, the first power signal input terminal V+ is connected to the power high-level signal VDD, and the second power signal input terminal V- is connected to the power low-level signal VSS, and in the display time period In the light-emitting phase, in the pixel driving circuits
  • the data signal input module 201 includes a first transistor T1, the gate of the first transistor T1 is connected to the first control signal WR, the first electrode of the first transistor T1 is connected to the data line Data, and the second transistor T1 is connected to the data line Data.
  • the electrode is connected to the first point A.
  • the light emitting device 202 includes a light emitting diode LED or an organic light emitting diode OLED, where the LED is an inverted-LED.
  • the driving module 203 includes a second transistor T2 and a third transistor T3.
  • the gate of the second transistor T2 is connected to the first point A, and the first electrode of the second transistor T2 and the second electrode of the third transistor T3 are connected to the second point.
  • B, the second electrode of the second transistor T2 and the cathode of the light-emitting device 202 are connected to the third point C, the gate of the third transistor T3 is connected to the second control signal EM, and the first electrode of the third transistor T3 is connected to the second Power signal input terminal V-.
  • the detection module 204 includes a fourth transistor T4, a fifth transistor T5, a sensing line sen-line, and a selection switch K.
  • the gate of the fourth transistor T4 is connected to the third control signal RD-E, and the first of the fourth transistor T4
  • the electrode is connected to the sensing line sen-line
  • the second electrode of the fourth transistor T4 is connected to the third point C
  • the gate of the fifth transistor T5 is connected to the fourth control signal RD-I
  • the first electrode of the fifth transistor T5 Connected to the sensing line sen-line
  • the second electrode of the fifth transistor T5 is connected to the second point B
  • the movable contact T of the selection switch K is connected to the sensing line sen-line
  • the first static contact of the selection switch K S1 is connected to the control voltage input terminal
  • the second static contact S2 of the selector switch K is connected to the analog-to-digital converter ADC.
  • the storage module 205 includes a storage capacitor Cst, the first plate of the storage capacitor Cst is connected to the first point A, and the second plate of the storage capacitor Cst is connected to the second point B.
  • one of the first electrode and the second electrode of each transistor is the source and the other is the drain.
  • the voltage value of the power supply high potential signal VDD is greater than the voltage value of the power supply low potential signal VSS, and the data line Data is used for ⁇ input data signal Vdata.
  • the second transistor T2 is a driving transistor.
  • the first threshold voltage of the driving module 203 is the first threshold voltage Vth of the second transistor T2
  • the second threshold voltage of the driving module 203 is the second threshold voltage of the second transistor T2.
  • Voltage Vth' Each transistor may be an N-type or P-type transistor. In this application, an N-type transistor is used to describe the working principle of the pixel driving circuit at each stage.
  • the threshold voltage of the driving module 202 will drift due to various reasons.
  • the threshold voltage of 202 is detected to obtain the first threshold voltage Vth, and then a compensation is performed by the input data signal during the display phase, which is usually external compensation.
  • the threshold voltage of the driving module 202 will also drift during use. Therefore, during the blank period between adjacent display frames, that is, the second detection period, the threshold voltage of the driving module 202 is measured. Through detection, the second threshold voltage Vth' can be obtained, and then the second threshold voltage Vth' can be compensated in the next display frame. This stage is usually internal compensation.
  • the internal compensation and external compensation are used in conjunction to compensate the threshold voltage drift of the driving module 202 during the entire working cycle, which can significantly improve the display effect.
  • FIG. 2 a schematic diagram of the switching of each transistor in the first detection period of the pixel driving circuit provided by this embodiment of the application.
  • the pixel driving circuit of FIG. 2 is in the first detection period.
  • the first detection time period includes an initialization phase t01, a charging phase t02, and a first detection phase t03.
  • the first power signal input terminal V+ is connected to the power low potential signal VSS
  • the second power signal is input
  • the terminal V- is connected to the power high potential signal VDD.
  • the first control signal WR is at a high potential
  • the first transistor T1 is turned on
  • the first data signal Vdata1 with a high potential is input to the first point A
  • the second control signal EM is at a high potential
  • the third transistor T3 is turned on.
  • the third control signal RD-E is at a high potential
  • the fourth transistor T4 is turned on
  • the fourth control signal RD-I is at a low potential
  • the fifth transistor T5 is turned off
  • the movable contact T of the selector switch K is connected to the first static contact S1
  • the reference voltage signal Vref is input to the control voltage input terminal.
  • the gate voltage of the second transistor T2 is Vdata1
  • the voltage of the second electrode of the second transistor T2 is Vref.
  • Vg represents the gate voltage of the drive transistor
  • Vs represents the source voltage of the drive transistor. Since the first power signal input terminal V+ is connected to the power low-potential signal VSS, the second power signal input terminal V- is connected to the power supply. With the high potential signal VDD, the second electrode of the second transistor T2 serves as the source s, that is, the voltage at the third point C is Vs, and the voltage at the first point A is Vg.
  • the first control signal WR maintains a high potential
  • the first transistor T1 is turned on
  • the second control signal EM maintains a high potential
  • the third transistor T3 is turned on
  • the third control signal RD-E maintains a high potential
  • the fourth transistor T4 Turn on, the fourth control signal RD-I maintains a low potential
  • the fifth transistor T5 is turned off, and the movable contact T of the selector switch K is disconnected from the first fixed contact S1 and the second fixed contact S2.
  • the first control signal WR is maintained at a high level
  • the first transistor T1 is turned on
  • the second control signal EM is maintained at a high level
  • the third transistor T3 is turned on
  • the third control signal RD-E is maintained at a high level.
  • the four transistor T4 is turned on
  • the fourth control signal RD-I maintains a low potential
  • the fifth transistor T5 is turned off
  • the movable contact T of the selector switch K is connected to the second static contact S2.
  • the sensing line sen-line is connected to The third point C is connected, so the voltage on the sensing line sen-line is the same as the voltage on the third point C.
  • the analog-to-digital converter ADC detects the voltage on the sensing line sen-line, generates corresponding data, and locks
  • the detected voltage value Vsamp is the voltage value Vdata1-Vth at the third point C at this time.
  • the first threshold voltage Vth can be obtained by subtracting the detected voltage Vdata1-Vth from the known Vdata1, and after obtaining the first threshold voltage Vth It is stored in the storage module 205, and then the input data signal is adjusted in the display stage after the power-on, so as to realize the compensation for the driving transistor.
  • the first power signal input terminal V+ is connected to the power low potential signal VSS
  • the second power signal input terminal V- is connected to the power high potential signal VDD
  • the anode of the light emitting device 202 is connected to the power low potential Signal VSS
  • the light-emitting device 202 can only be turned on in one direction, when the anode voltage is lower than the cathode voltage, the light-emitting device 202 will be cut off immediately, and no current will leak from the light-emitting device 202, which will affect the detection result of the detection module 204 Therefore, the accuracy of detection is improved. After compensation, the compensation effect is better and the display effect is better.
  • the pixel driving circuit provided in this embodiment of the application is a schematic diagram of the switching of each transistor in the reset phase of the second detection period.
  • the pixel driving circuit provided in this embodiment of the application is The schematic diagram of the switching of each transistor in the second detection stage of the second detection period and the data writing stage of the display period is shown in FIG.
  • the schematic diagram of the switching of each transistor in the light-emitting phase is shown in FIG. 7, which is a timing diagram of each signal of the pixel driving circuit of FIGS. 4 to 6 in the first detection period and the display period.
  • the first detection time period is the blank time period between adjacent display frames, including the reset phase t1 and the second detection phase t2, and the display time period is the time period where the display frame is located, including the data writing phase t3 and the light-emitting phase t4.
  • the first power signal input terminal V+ is connected to the power high potential signal VDD
  • the second power signal input terminal V- is connected to the power low potential signal VSS.
  • the first control signal WR is at a high level
  • the first transistor T1 is turned on
  • the initial voltage signal Vini is input to the first point A
  • the second control signal EM is at a low level
  • the third transistor T3 is turned off
  • the third control signal RD-E is low potential
  • the fourth transistor T4 is turned off
  • the fourth control signal RD-I is high potential
  • the fifth transistor T5 is turned on
  • the movable contact T of the selector switch K is connected to the first static contact S1
  • the control voltage is input
  • the terminal also inputs the initial voltage signal Vini.
  • the gate voltage of the second transistor T2 is Vini
  • the voltage of the second electrode of the second transistor T2 is also Vini.
  • Vg represents the gate voltage of the driving transistor
  • Vs represents the source voltage of the driving transistor.
  • the first electrode of the second transistor T2 serves as the source s, that is, the second point B
  • the voltage is Vs
  • the voltage at the first point A is Vg
  • the first control signal WR maintains a high level
  • the first transistor T1 is turned on
  • the compensated reference data signal Vref+Vth is input to the first point A according to the first threshold voltage Vth.
  • Vref and the reference voltage signal Vref input from the control voltage input terminal of the first detection period are signals input from different input terminals, and the values of the two can be the same or different.
  • the second control signal EM maintains a low potential
  • the third transistor T3 is turned off
  • the third control signal RD-E is at a low potential
  • the fourth transistor T4 is turned off
  • the fourth control signal RD-I is at a low potential
  • the fifth transistor T5 is turned off.
  • the first control signal WR maintains a high level
  • the first transistor T1 is turned on
  • the compensated second data signal Vdata2+Vth is input to the first point A according to the first threshold voltage Vth
  • the second control signal EM maintains a low potential
  • the third transistor T3 is turned off
  • the third control signal RD-E is maintained at a low potential
  • the fourth transistor T4 is turned off
  • the fourth control signal RD-I is maintained at a low potential
  • the fifth transistor T5 is turned off.
  • the potential of the first point A changes to Vdata2-Vref, due to the common coupling effect of the storage capacitor Cst and the parasitic capacitance Ctft of the second transistor T2 .
  • the first control signal WR is at a low potential
  • the first transistor T1 is turned off
  • the second control signal EM is at a high potential
  • the third transistor T3 is turned on
  • the third control signal RD-E maintains a low potential
  • the fourth transistor T4 Turn off
  • the fourth control signal RD-I maintains a low level
  • the light emitting device 202 emits light. At this time, the driving current I flowing through the light emitting device 202 satisfies the formula:
  • K is the intrinsic conductivity factor of the driving thin film transistor, that is, the second transistor T2. It can be seen that the current flowing through the light-emitting device 202 has nothing to do with the first threshold voltage Vth and the second threshold voltage Vth' of the second transistor T2. In this way, the influence of the drift of the first threshold voltage Vth and the second threshold voltage Vth' of the driving transistor on the light-emitting device 202 is eliminated, and the threshold voltage drift of the display panel during the entire working cycle is compensated, so that the brightness of the display panel is Guaranteed.
  • the cathodes of the light-emitting devices are connected together, and the current flowing through the cathodes is controlled by the power low-potential signal VSS. Because the pixel cathodes at different positions on the panel have different distances to the input end of the power low-potential signal Specifically, the farther away from the input terminal of the power low-potential signal VSS, the lower the voltage, that is, the phenomenon of power supply voltage drop (IR-Drop) occurs.
  • IR-Drop the phenomenon of power supply voltage drop
  • IR-Drop will cause the cathodes of the light-emitting devices in different positions There is a difference between the voltage difference between the anode and the anode, which in turn leads to uneven light emission of the panel, which affects the display quality of the image.
  • the anodes of all the light-emitting devices 202 are connected together, and the cathodes are connected to the output terminal of the driving module 203.
  • the second transistor T2 is in a saturated state, according to the characteristic curve of the TFT It can be seen that the potential of the third point C is also in a stable state, so that in the pixel driving circuits corresponding to different pixels, the current values of the output terminals of the driving module 203 are all in the preset range, so the cathodes of the light-emitting devices located at different positions of the display panel receive power.
  • the influence of the pressure drop is small, so that the display brightness is uniform throughout the display panel, and the display effect is improved.
  • FIG. 8 shows a schematic diagram of the comprehensive compensation process, which specifically includes the following steps:
  • S20 External detection: the input signals of the first power signal input terminal and the second power signal input terminal are inverted, and the threshold voltage drift amount Vth in the external compensation period is detected and obtained.
  • the first power signal input terminal V+ inputs the power high-potential signal VDD
  • the second power signal input terminal V- inputs the power low-potential signal VSS.
  • the input signals of the first power signal input terminal and the second power signal input terminal are inverted, the first power signal input terminal V+ inputs the power low potential signal VSS, and the second power signal input terminal V- inputs the power high potential signal VDD. Therefore, the anode of the light-emitting device 202 is connected to the power low-potential signal VSS.
  • the light-emitting device 202 can only conduct unidirectionally, when the anode voltage is lower than the cathode voltage, the light-emitting device 202 will be cut off immediately, and no current will flow from the light-emitting device 202. Leakage affects the detection result of the detection module 204, so the accuracy of detection is improved, the compensation effect is better after compensation, and the display effect is better.
  • the detection module 204 obtains the threshold voltage drift Vth of the external compensation period, that is, the first threshold voltage Vth.
  • S30 External supplement: Generate compensation data based on Vth data and store it in a storage unit such as Flash.
  • the data that needs to be compensated during the display time period is calculated according to the value of Vth, and then the data is stored in a storage unit such as Flash.
  • the input signals of the first power signal input terminal and the second power signal input terminal are restored, that is, the first power signal input terminal V+ still inputs the power high potential signal VDD, and the second power signal input terminal V- still inputs power The low level signal VSS, then, by controlling the level of each input signal, in the second detection stage of the second detection period, the compensated reference data signal Vref+Vth is input to the first point, during the display period In the data writing stage, the compensated second data signal Vdata2+Vth is input to the first point to detect and compensate the newly added threshold voltage drift Vth', that is, the second threshold voltage Vth', so as to achieve A mixed compensation scheme with external and internal compensation.
  • the pixel driving circuit of the present application detects the threshold voltage of the driving module 203 in both the first detection period and the second detection period, and performs comprehensive compensation during the display period, so the compensation effect Better.
  • the anodes of all the light-emitting devices 202 in the display panel are connected together, and the cathodes are connected to the output terminal of the driving module 203.
  • the driving module In the light-emitting phase, in the pixel driving circuit corresponding to different sub-pixels, the driving module The voltage values of the output terminals of 203 are all in the preset range, that is, the voltage values of the cathodes of the light-emitting devices 202 located in different positions of the display panel are in the preset range. Therefore, the light-emitting devices 202 are less affected by the voltage drop of the power supply, so that the display panel The display brightness is uniform everywhere.
  • the anode of the light-emitting device 202 is connected to the power low-potential signal VSS, which can directly turn off the light-emitting device 202, avoiding the leakage of the light-emitting device 202 to the detection module 204. Thereby improving the detection accuracy.
  • the present application also provides a display panel, including the pixel driving circuit described in any of the above embodiments.
  • the pixel driving circuit provided by the embodiment of the present application, the cathode voltage of each light-emitting device is less affected by the voltage drop of the power supply, so that the display brightness of the display panel is uniform.
  • the embodiment of the application provides a pixel drive circuit and a display panel.
  • the pixel drive circuit includes a data signal input module, a light emitting device, a drive module, a detection module, and a storage module; the data signal input module is used for the first detection time period.
  • the first data signal is input to the first point, and the first detection period is the non-display period before turning on or after turning off; the anode of the light-emitting device is connected to the first power signal input terminal; driving The first input end of the module is connected to the data signal input module through the first point, the second input end of the drive module is connected to the second power signal input end, the output end of the drive module is connected to the cathode of the light-emitting device, and the drive module is used in Under the control of the second control signal and the potential of the first point, the light-emitting device is driven to emit light; the detection module is connected to the third input terminal of the driving module through the second point, and is connected to the output terminal of the driving module through the third point for In the first detection period, under the control of the third control signal, the first threshold voltage of the driving module is detected, and in the second detection period, under the control of the fourth control signal, the first threshold voltage of the driving module is detected.
  • the second detection period is the blank period between adjacent display frames;
  • the storage module is connected to the drive module through the first point and the second point, and is used to store the first threshold voltage and the second threshold voltage of the drive module Threshold voltage; wherein, the data input module is also used to input the compensated second data signal to the first point in the data writing stage of the display time period according to the first threshold voltage detected by the detection module; drive module It is also used to input a driving current to the light-emitting device during the light-emitting stage of the display period according to the second data signal and the second threshold voltage detected by the detection module.
  • the value is irrelevant; in the first detection period, the first power signal input terminal is connected to the power low-level signal, and the second power signal input terminal is connected to the power high-level signal.
  • the first One power signal input terminal is connected to the power high potential signal, and the second power signal input terminal is connected to the power low potential signal, and in the light-emitting stage of the display period, in the pixel drive circuit corresponding to different sub-pixels, the output terminal voltage of the drive module
  • the values are all in the preset range.
  • the anodes of all light-emitting devices in the display panel are connected together, and the cathodes are connected to the output terminal of the driving module.
  • the output terminal of the driving module The voltage values are all in the preset range, that is, the voltage values of the cathodes of the light-emitting devices located at different positions of the display panel are in the preset range, so each light-emitting device is less affected by the voltage drop of the power supply, so that the display brightness of the display panel is uniform.
  • the anode of the light-emitting device is connected to the low-potential signal of the power supply, which can directly cut off the light-emitting device, avoiding the leakage of the light-emitting device to the detection module, thereby improving the detection accuracy.

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Abstract

一种像素驱动电路和显示面板，像素驱动电路中发光器件（202）阴极连接驱动模块（203）输出端，在第一侦测时间段发光器件阳极接入电源低电位信号（VSS），在第二侦测时间段和显示时间段，发光器件（202）阳极接入电源高电位信号（VDD），在显示时间段的发光阶段，对应不同子像素，驱动模块（203）的输出端电压值均处于预设范围，使显示面板亮度均匀。

Description

像素驱动电路和显示面板 技术领域
本申请涉及显示技术领域，尤其涉及一种像素驱动电路和显示面板。
 背景技术
现有的OLED或Inverted-LED显示面板中，各子像素对应的发光器件的阴极均接入电源低电位信号VSS，阳极分别与3T1C像素驱动电路连接，其中，像素驱动电路中的驱动晶体管用于驱动发光器件发光，由于各种原因驱动晶体管的阈值电压Vth会产生漂移，因此通常在开机之间或关机之后的第一侦测时间段、以及相邻显示帧之间的第二侦测时间段，对驱动晶体管的阈值电压Vth进行综合补偿。然而，处于面板不同位置的发光器件的阴极，到达电源低电位信号VSS输入端的距离是有差异的，而距离输入端较远处阴极的电压小于距离输入端较较近处阴极的电压，即产生电源压降（IR-Drop）现象，使不同发光器件两端阴极和阳极的压差存在差异，距离输入端越远，压差越小，最终会导致显示画面亮度的不均匀。
因此，现有显示面板存在画面亮度不均匀的技术问题，需要改进。
 技术问题
本申请实施例提供一种像素驱动电路和显示面板，用以缓解现有显示面板中画面亮度不均匀的技术问题。
 技术解决方案
为解决上述问题，本申请提供的技术方案如下：
本申请实施例提供一种像素驱动电路，包括：
数据信号输入模块，用于第一侦测时间段，在第一控制信号的控制下，向第一点输入第一数据信号，所述第一侦测时间段为开机之前或关机之后的非显示时间段；
发光器件，所述发光器件的阳极与第一电源信号输入端连接；
驱动模块，所述驱动模块的第一输入端通过所述第一点与所述数据信号输入模块连接，所述驱动模块的第二输入端与第二电源信号输入端连接，所述驱动模块的输出端与所述发光器件的阴极连接，所述驱动模块用于在第二控制信号和所述第一点的电位控制下，驱动所述发光器件发光；
侦测模块，通过第二点与所述驱动模块的第三输入端连接，通过第三点与所述驱动模块的输出端连接，用于在所述第一侦测阶时间段，在第三控制信号的控制下，侦测所述驱动模块的第一阈值电压，在第二侦测时间段，在第四控制信号的控制下，侦测所述驱动模块的第二阈值电压，所述第二侦测时间段为相邻显示帧之间的空白时间段；
存储模块，通过所述第一点和所述第二点与所述驱动模块连接，用于存储所述驱动模块的第一阈值电压和第二阈值电压；
其中，所述数据输入模块还用于，根据所述侦测模块侦测到的第一阈值电压，在所述显示时间段的数据写入阶段，向所述第一点输入补偿后的第二数据信号；所述驱动模块还用于，根据所述第二数据信号和所述侦测模块侦测到的第二阈值电压，在所述显示时间段的发光阶段，向所述发光器件输入驱动电流，所述驱动电流与所述第一阈值电压和所述第二阈值电压的数值无关；在所述第一侦测时间段，所述第一电源信号输入端接入电源低电位信号，所述第二电源信号输入端接入电源高电位信号，在所述第二侦测时间段和所述显示时间段，所述第一电源信号输入端接入电源高电位信号，所述第二电源信号输入端接入电源低电位信号，且在所述显示时间段的发光阶段，不同子像素对应的像素驱动电路中，所述驱动模块的输出端电压值均处于预设范围。
在本申请的像素驱动电路中，所述数据信号输入模块包括第一晶体管，所述第一晶体管的栅极接入所述第一控制信号，所述第一晶体管的第一电极与数据线连接，所述第一晶体管的第二电极与所述第一点连接。
在本申请的像素驱动电路中，所述发光器件包括发光二极管或有机发光二极管。
在本申请的像素驱动电路中，所述驱动模块包括第二晶体管和第三晶体管，所述第二晶体管的栅极与所述第一点连接，所述第二晶体管的第一电极与所述第三晶体管的第二电极连接于所述第二点，所述第二晶体管的第二电极与所述发光器件的阴极连接于所述第三点，所述第三晶体管的栅极接入所述第二控制信号，所述第三晶体管的第一电极接入所述第二电源信号输入端。
在本申请的像素驱动电路中，所述侦测模块包括第四晶体管、第五晶体管、感测线和选择开关，所述第四晶体管的栅极接入所述第三控制信号，所述第四晶体管的第一电极与所述感测线连接，所述第四晶体管的第二电极与所述第三点连接，所述第五晶体管的栅极接入所述第四控制信号，所述第五晶体管的第一电极与所述感测线连接，所述第五晶体管的第二电极与所述第二点连接，所述选择开关的动触点与所述感测线连接，所述选择开关的第一静触点与控制电压输入端连接，所述选择开关的第二静触点与模数转换器连接。
在本申请的像素驱动电路中，所述存储模块包括存储电容，所述存储电容的第一极板与所述第一点连接，所述存储电容的第二极板与所述第二点连接。
在本申请的像素驱动电路中，在所述第一侦测时间段，所述第三控制信号为高电位，所述第四控制信号为低电位。
在本申请的像素驱动电路中，所述第一侦测时间段包括初始化阶段、充电阶段和第一侦测阶段，所述侦测模块用于，在所述初始化阶段，控制所述选择开关的动触点与第一静触点连接，在所述充电阶段，控制所述选择开关的动触点与第一静触点和所述第二静触点均断开，在所述第一侦测阶段，控制所述选择开关的动触点与第二静触点连接。
在本申请的像素驱动电路中，在所述初始化阶段，所述控制电压输入端输入参考电压信号。
在本申请的像素驱动电路中，所述第二侦测时间段包括复位阶段和第二侦测阶段，在所述复位阶段，所述第三控制信号为低电位，所述第四控制信号为高电位，在所述第二侦测阶段，所述第三控制信号和所述第四控制信号均为低电位。
在本申请的像素驱动电路中，所述侦测模块用于，在所述复位阶段，控制所述选择开关的动触点与第一静触点连接。
在本申请的像素驱动电路中，在所述复位阶段，所述控制电压输入端输入初始电压信号。
在本申请的像素驱动电路中，所述数据输入模块用于，在所述第二侦测阶段，根据所述侦测模块侦测到的第一阈值电压，向所述第一点输入补偿后的参考数据信号。
在本申请的像素驱动电路中，在所述显示时间段，所述第三控制信号和所述第四控制信号均为低电位。
本申请还提供一种显示面板，包括像素驱动电路，所述像素驱动电路包括：
数据信号输入模块，用于第一侦测时间段，在第一控制信号的控制下，向第一点输入第一数据信号，所述第一侦测时间段为开机之前或关机之后的非显示时间段；
发光器件，所述发光器件的阳极与第一电源信号输入端连接；
驱动模块，所述驱动模块的第一输入端通过所述第一点与所述数据信号输入模块连接，所述驱动模块的第二输入端与第二电源信号输入端连接，所述驱动模块的输出端与所述发光器件的阴极连接，所述驱动模块用于在第二控制信号和所述第一点的电位控制下，驱动所述发光器件发光；
侦测模块，通过第二点与所述驱动模块的第三输入端连接，通过第三点与所述驱动模块的输出端连接，用于在所述第一侦测阶时间段，在第三控制信号的控制下，侦测所述驱动模块的第一阈值电压，在第二侦测时间段，在第四控制信号的控制下，侦测所述驱动模块的第二阈值电压，所述第二侦测时间段为相邻显示帧之间的空白时间段；
存储模块，通过所述第一点和所述第二点与所述驱动模块连接，用于存储所述驱动模块的第一阈值电压和第二阈值电压；
其中，所述数据输入模块还用于，根据所述侦测模块侦测到的第一阈值电压，在所述显示时间段的数据写入阶段，向所述第一点输入补偿后的第二数据信号；所述驱动模块还用于，根据所述第二数据信号和所述侦测模块侦测到的第二阈值电压，在所述显示时间段的发光阶段，向所述发光器件输入驱动电流，所述驱动电流与所述第一阈值电压和所述第二阈值电压的数值无关；在所述第一侦测时间段，所述第一电源信号输入端接入电源低电位信号，所述第二电源信号输入端接入电源高电位信号，在所述第二侦测时间段和所述显示时间段，所述第一电源信号输入端接入电源高电位信号，所述第二电源信号输入端接入电源低电位信号，且在所述显示时间段的发光阶段，不同子像素对应的像素驱动电路中，所述驱动模块的输出端电压值均处于预设范围。
在本申请的显示面板中，所述数据信号输入模块包括第一晶体管，所述第一晶体管的栅极接入所述第一控制信号，所述第一晶体管的第一电极与数据线连接，所述第一晶体管的第二电极与所述第一点连接。
在本申请的显示面板中，所述发光器件包括发光二极管或有机发光二极管。
在本申请的显示面板中，所述驱动模块包括第二晶体管和第三晶体管，所述第二晶体管的栅极与所述第一点连接，所述第二晶体管的第一电极与所述第三晶体管的第二电极连接于所述第二点，所述第二晶体管的第二电极与所述发光器件的阴极连接于所述第三点，所述第三晶体管的栅极接入所述第二控制信号，所述第三晶体管的第一电极接入所述第二电源信号输入端。
在本申请的显示面板中，所述侦测模块包括第四晶体管、第五晶体管、感测线和选择开关，所述第四晶体管的栅极接入所述第三控制信号，所述第四晶体管的第一电极与所述感测线连接，所述第四晶体管的第二电极与所述第三点连接，所述第五晶体管的栅极接入所述第四控制信号，所述第五晶体管的第一电极与所述感测线连接，所述第五晶体管的第二电极与所述第二点连接，所述选择开关的动触点与所述感测线连接，所述选择开关的第一静触点与控制电压输入端连接，所述选择开关的第二静触点与模数转换器连接。
在本申请的显示面板中，所述存储模块包括存储电容，所述存储电容的第一极板与所述第一点连接，所述存储电容的第二极板与所述第二点连接。
 有益效果
本申请的有益效果：本申请实施例提供一种像素驱动电路和显示面板，像素驱动电路包括数据信号输入模块、发光器件、驱动模块、侦测模块和存储模块；数据信号输入模块用于第一侦测时间段，在第一控制信号的控制下，向第一点输入第一数据信号，第一侦测时间段为开机之前或关机之后的非显示时间段；发光器件的阳极与第一电源信号输入端连接；驱动模块的第一输入端通过第一点与数据信号输入模块连接，驱动模块的第二输入端与第二电源信号输入端连接，驱动模块的输出端与发光器件的阴极连接，驱动模块用于在第二控制信号和第一点的电位控制下，驱动发光器件发光；侦测模块通过第二点与驱动模块的第三输入端连接，通过第三点与驱动模块的输出端连接，用于在第一侦测阶时间段，在第三控制信号的控制下，侦测驱动模块的第一阈值电压，在第二侦测时间段，在第四控制信号的控制下，侦测驱动模块的第二阈值电压，第二侦测时间段为相邻显示帧之间的空白时间段；存储模块通过第一点和第二点与驱动模块连接，用于存储驱动模块的第一阈值电压和第二阈值电压；其中，数据输入模块还用于，根据侦测模块侦测到的第一阈值电压，在显示时间段的数据写入阶段，向第一点输入补偿后的第二数据信号；驱动模块还用于，根据第二数据信号和侦测模块侦测到的第二阈值电压，在显示时间段的发光阶段，向发光器件输入驱动电流，驱动电流与第一阈值电压和第二阈值电压的数值无关；在第一侦测时间段，第一电源信号输入端接入电源低电位信号，第二电源信号输入端接入电源高电位信号，在第二侦测时间段和显示时间段，第一电源信号输入端接入电源高电位信号，第二电源信号输入端接入电源低电位信号，且在显示时间段的发光阶段，不同子像素对应的像素驱动电路中，驱动模块的输出端电压值均处于预设范围。本申请的像素驱动电路中，显示面板中所有发光器件的阳极均连接在一起，阴极均与驱动模块的输出端连接，在发光阶段，不同子像素对应的像素驱动电路中，驱动模块的输出端电压值均处于预设范围，即位于显示面板不同位置的发光器件的阴极的电压值处于预设范围，因此各发光器件受电源压降的影响较小，从而使得显示面板各处的显示亮度均匀，此外，在第一侦测时间段，发光器件的阳极接入电源低电位信号，可以直接将发光器件截止，避免了发光器件向侦测模块漏电，从而提高了侦测准确度。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的像素驱动电路的结构示意图。
图2为本申请实施例提供的像素驱动电路在第一侦测时间段内各晶体管的开关示意图。
图3为本申请实施例提供的像素驱动电路在第一侦测时间段内各信号的时序图。
图4为本申请实施例提供的像素驱动电路在第二侦测时间段的复位阶段内各晶体管的开关示意图。
图5为本申请实施例提供的像素驱动电路在第二侦测时间段的第二侦测阶段、以及显示时间段的数据写入阶段内各晶体管的开关示意图。
图6为本申请实施例提供的像素驱动电路在显示时间段的的发光阶段内各晶体管的开关示意图。
图7为本申请实施例提供的像素驱动电路在第二侦测时间段和显示时间段内各信号的时序图。
图8为本申请实施例提供的像素驱动电路综合补偿的流程示意图。
 本发明的实施方式
以下各实施例的说明是参考附加的图示，用以例示本申请可用以实施的特定实施例。本申请所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本申请，而非用以限制本申请。在图中，结构相近的单元是用以相同标号表示。
本申请实施例提供一种像素驱动电路和显示面板，用以缓解现有显示面板中画面亮度不均匀的技术问题。
如图1所示，为本申请实施例提供的像素驱动电路的结构示意图，像素驱动电路包括数据信号输入模块201、发光器件202、驱动模块203、侦测模块204和存储模块205；
数据信号输入模块201用于第一侦测时间段，在第一控制信号WR的控制下，向第一点A输入第一数据信号，第一侦测时间段为开机之前或关机之后的非显示时间段；
发光器件202的阳极与第一电源信号输入端V+连接；
驱动模块203的第一输入端通过第一点A与数据信号输入模块201连接，驱动模块203的第二输入端与第二电源信号输入端V-连接，驱动模块203的输出端与发光器件202的阴极连接，驱动模块203用于在第二控制信号EM和第一点A的电位控制下，驱动发光器件203发光；
侦测模块204通过第二点B与驱动模块203的第三输入端连接，通过第三点C与驱动模块203的输出端连接，用于在第一侦测阶时间段，在第三控制信号RD-E的控制下，侦测驱动模块203的第一阈值电压Vth，在第二侦测时间段，在第四控制信号RD-I的控制下，侦测驱动模块203的第二阈值电压Vth’，第二侦测时间段为相邻显示帧之间的空白时间段；
存储模块205通过第一点A和第二点B与驱动模块203连接，用于存储驱动模块203的第一阈值电压Vth和第二阈值电压Vth’；
其中，数据输入模块201还用于，根据侦测模块204侦测到的第一阈值电压Vth，在显示时间段的数据写入阶段，向第一点A输入补偿后的第二数据信号；驱动模块203还用于，根据第二数据信号和侦测模块204侦测到的第二阈值电压Vth’，在显示时间段的发光阶段，向发光器件202输入驱动电流，驱动电流与第一阈值电压Vth和第二阈值电压Vth’的数值无关；在第一侦测时间段，第一电源信号输入端V+接入电源低电位信号VSS，第二电源信号输入端V-接入电源高电位信号VDD，在第二侦测时间段和显示时间段，第一电源信号输入端V+接入电源高电位信号VDD，第二电源信号输入端V-接入电源低电位信号VSS，且在显示时间段的发光阶段，不同子像素对应的像素驱动电路中，驱动模块203的输出端电压值均处于预设范围。
具体地，数据信号输入模块201包括第一晶体管T1，第一晶体管T1的栅极接入第一控制信号WR，第一晶体管T1的第一电极与数据线Data连接，第一晶体管T1的第二电极与第一点A连接。
发光器件202包括发光二极管LED或有机发光二极管OLED，其中LED为倒置发光二极管Inverted-LED。
驱动模块203包括第二晶体管T2和第三晶体管T3，第二晶体管T2的栅极与第一点A连接，第二晶体管T2的第一电极与第三晶体管T3的第二电极连接于第二点B，第二晶体管T2的第二电极与发光器件202的阴极连接于第三点C，第三晶体管T3的栅极接入第二控制信号EM，第三晶体管T3的第一电极接入第二电源信号输入端V-。
侦测模块204包括第四晶体管T4、第五晶体管T5、感测线sen-line和选择开关K，第四晶体管T4的栅极接入第三控制信号RD-E，第四晶体管T4的第一电极与感测线sen-line连接，第四晶体管T4的第二电极与第三点C连接，第五晶体管T5的栅极接入第四控制信号RD-I，第五晶体管T5的第一电极与感测线sen-line连接，第五晶体管T5的第二电极与第二点B连接，选择开关K的动触点T与感测线sen-line连接，选择开关K的第一静触点S1与控制电压输入端连接，选择开关K的第二静触点S2与模数转换器ADC连接。
存储模块205包括存储电容Cst，存储电容Cst的第一极板与第一点A连接，存储电容Cst的第二极板与第二点B连接。
在本申请中，各晶体管的第一电极和第二电极，其中一个为源极，另一个为漏极，电源高电位信号VDD的电压值大于电源低电位信号VSS的电压值，数据线Data用于输入数据信号Vdata。驱动模块203中，第二晶体管T2为驱动晶体管，驱动模块203的第一阈值电压即第二晶体管T2的第一阈值电压Vth，驱动模块203的第二阈值电压即第二晶体管T2的第二阈值电压Vth’。各晶体管可以是N型或P型晶体管，本申请以N型晶体管对像素驱动电路在各阶段的工作原理进行说明。
本申请的像素驱动电路，在开机之前或关机之后的非显示时间段，也即第一侦测时间段，驱动模块202的阈值电压会因各种原因产生漂移，因此在该时间段对驱动模块202的阈值电压进行侦测，可以得到第一阈值电压Vth，然后在显示阶段通过输入的数据信号进行一次补偿，该阶段通常为外部补偿。此外，在显示阶段，驱动模块202在使用过程中阈值电压也会产生漂移，因此在相邻显示帧之间的空白时间段，也即第二侦测时间段，对驱动模块202的阈值电压进行侦测，可以得到第二阈值电压Vth’，然后在下一显示帧对第二阈值电压Vth’进行补偿，该阶段通常为内部补偿。通过内部补偿和外部补偿配合使用，对驱动模块202在整个工作周期内的阈值电压漂移情况进行补偿，可以显著提高显示效果。
如图2所示，为本申请实施例提供的像素驱动电路在第一侦测时间段内各晶体管的开关示意图，如图3所示，为图2的像素驱动电路在第一侦测时间段内各信号的时序图。第一侦测时间段包括初始化阶段t01、充电阶段t02和第一侦测阶段t03，在第一侦测时间段，第一电源信号输入端V+接入电源低电位信号VSS，第二电源信号输入端V-接入电源高电位信号VDD。
在初始化阶段t01，第一控制信号WR为高电位，第一晶体管T1打开，向第一点A输入高电位的第一数据信号Vdata1，第二控制信号EM为高电位，第三晶体管T3打开，第三控制信号RD-E为高电位，第四晶体管T4打开，第四控制信号RD-I为低电位，第五晶体管T5关闭，选择开关K的动触点T与第一静触点S1连接，控制电压输入端输入参考电压信号Vref。此时，第二晶体管T2的栅极电压为Vdata1，第二晶体管T2的第二电极的电压为Vref。
本申请中，以Vg表示驱动晶体管的栅极电压，Vs表示驱动晶体管的源极电压，由于第一电源信号输入端V+接入电源低电位信号VSS，第二电源信号输入端V-接入电源高电位信号VDD，第二晶体管T2的第二电极作为源极s，即第三点C的电压为Vs，第一点A的电压为Vg。
在充电阶段t02，第一控制信号WR维持高电位，第一晶体管T1打开，第二控制信号EM维持高电位，第三晶体管T3打开，第三控制信号RD-E维持高电位，第四晶体管T4打开，第四控制信号RD-I维持低电位，第五晶体管T5关闭，选择开关K的动触点T与第一静触点S1和第二静触点S2均断开，此时，第三点C的电压不断上升，直至Vs=Vdata1-Vth。
在第一侦测阶段t03，第一控制信号WR维持高电位，第一晶体管T1打开，第二控制信号EM维持高电位，第三晶体管T3打开，第三控制信号RD-E维持高电位，第四晶体管T4打开，第四控制信号RD-I维持低电位，第五晶体管T5关闭，选择开关K的动触点T与第二静触点S2连接，此时，由于感测线sen-line与第三点C连接，因此感测线sen-line上的电压与第三点C的电压相同，模数转换器ADC对感测线sen-line上的电压进行侦测，产生对应的数据后锁存，侦测的电压值Vsamp即为此时第三点C的电压值Vdata1-Vth。
在侦测完成后，由于第一数据信号Vdata1为已知数值，所以可通过用已知的Vdata1减去侦测的电压Vdata1-Vth来获取第一阈值电压Vth，获取后将第一阈值电压Vth存储在存储模块205中，然后在开机之后的显示阶段对输入的数据信号进行调整，以此来实现对驱动晶体管的补偿。
在第一侦测时间段，第一电源信号输入端V+接入电源低电位信号VSS，第二电源信号输入端V-接入电源高电位信号VDD，因此发光器件202的阳极接入电源低电位信号VSS，由于发光器件202只能单向导通，当阳极电压低于阴极电压时，发光器件202会立即截止，不会有电流从发光器件202中漏出，对侦测模块204的侦测结果造成影响，因此提高了侦测的准确度，在补偿后补偿效果更佳，显示效果更好。
如图4所示，为本申请实施例提供的像素驱动电路在第二侦测时间段的复位阶段内各晶体管的开关示意图，如图5所示，为本申请实施例提供的像素驱动电路在第二侦测时间段的第二侦测阶段、以及显示时间段的数据写入阶段内各晶体管的开关示意图，如图6所示，为本申请实施例提供的像素驱动电路在显示时间段的发光阶段内各晶体管的开关示意图，如图7所示，为图4至图6的像素驱动电路在第一侦测时间段和显示时间段内各信号的时序图。第一侦测时间段为相邻显示帧之间的空白时间段，包括复位阶段t1和第二侦测阶段t2，显示时间段为显示帧所在的时间段，包括数据写入阶段t3和发光阶段t4。在第一侦测时间段和显示时间段，第一电源信号输入端V+接入电源高电位信号VDD，第二电源信号输入端V-接入电源低电位信号VSS。
在复位阶段t1，第一控制信号WR为高电位，第一晶体管T1打开，向第一点A输入初始电压信号Vini，第二控制信号EM为低电位，第三晶体管T3关闭，第三控制信号RD-E为低电位，第四晶体管T4关闭，第四控制信号RD-I为高电位，第五晶体管T5打开，选择开关K的动触点T与第一静触点S1连接，控制电压输入端也输入初始电压信号Vini。此时，第二晶体管T2的栅极电压为Vini，第二晶体管T2的第二电极的电压也为Vini。
本申请中，以Vg表示驱动晶体管的栅极电压，Vs表示驱动晶体管的源极电压，在第二侦测时间段，第二晶体管T2的第一电极作为源极s，即第二点B的电压为Vs，第一点A的电压为Vg，驱动晶体管的栅极与源极的电压差Vgs=0。
在第二侦测阶段t2，第一控制信号WR维持高电位，第一晶体管T1打开，根据第一阈值电压Vth，向第一点A输入补偿后的参考数据信号Vref+Vth，注意此处的Vref与第一侦测时间段控制电压输入端输入的参考电压信号Vref为不同输入端输入的信号，两者数值可以相同，也可以不同。第二控制信号EM维持低电位，第三晶体管T3关闭，第三控制信号RD-E为低电位，第四晶体管T4关闭，第四控制信号RD-I为低电位，第五晶体管T5关闭。此时，第一点A的电压值Vg=Vref+Vth，由于存储电容Cst的作用，第二点B的电位Vs会逐渐升高，直至Vgs=Vth+Vth’时完成充电，然后，Vth’被存储至存储电容Cst的两侧，此时，第二点B的电位Vs=Vref-Vth’。
在数据写入阶段t3，第一控制信号WR维持高电位，第一晶体管T1打开，根据第一阈值电压Vth，向第一点A输入补偿后的第二数据信号Vdata2+Vth，第二控制信号EM维持低电位，第三晶体管T3关闭，第三控制信号RD-E维持低电位，第四晶体管T4关闭，第四控制信号RD-I维持低电位，第五晶体管T5关闭。此时，第一点A的电位Vg=Vdata2+Vth，相对于上一阶段，第一点A的电位变化为Vdata2-Vref，由于存储电容Cst和第二晶体管T2的寄生电容Ctft的共同耦合作用，第二点B的电位Vs=（Vref-Vth’）+△V，其中△V=（Vdata-Vref）*Cst/（Cst+Ctft），其中Cst为存储电容Cst的电容值，Ctft为第二晶体管T2的寄生电容Ctft的电容值，Vgs=Vdata2+Vth-Vref+Vth’-△V。
在发光阶段t4，第一控制信号WR为低电位，第一晶体管T1关闭，第二控制信号EM为高电位，第三晶体管T3打开，第三控制信号RD-E维持低电位，第四晶体管T4关闭，第四控制信号RD-I维持低电位，第五晶体管T5关闭。由于存储电容Cst的维持作用，第一点A的电位仍然为Vg=Vdata2+Vth，第一点A和第二点B的电压差Vgs=Vdata2+Vth-Vref+Vth’-△V，以驱动发光器件202发光，此时，流经发光器件202的驱动电流I满足公式：
I=K（Vgs-（Vth+Vth’））²
将Vgs=Vdata2+Vth-Vref+Vth’-△V带入公式，得到的结果为：
I=K（Vdata2-Vref-△V）²
其中，K为驱动薄膜晶体管即第二晶体管T2的本征导电因子，可见，流过发光器件202的电流与第二晶体管T2的第一阈值电压Vth和第二阈值电压Vth’均无关，通过此种方式，消除了驱动晶体管的第一阈值电压Vth和第二阈值电压Vth’漂移对发光器件202的影响，实现了对显示面板在整个工作周期内阈值电压漂移情况的补偿，使得显示面板的亮度得到保证。
在现有技术中，各发光器件的阴极连接在一起，通过电源低电位信号VSS来控制流过阴极的电流，由于处于面板不同位置的像素阴极，到达电源低电位信号输入端的距离是有差异的，具体为距离电源低电位信号VSS输入端越远，电压越小，即产生电源压降现象(IR-Drop)，在大面积显示的面板上，IR-Drop会使得处于不同位置的发光器件阴极和阳极压差产生差异，进而导致面板发光不均匀，影响图像的显示质量。
而在本申请的像素驱动电路中，所有发光器件202的阳极均连接在一起，阴极均与驱动模块203的输出端连接，在发光阶段t4，第二晶体管T2处于饱和状态，根据TFT的特性曲线可知第三点C的电位也处于稳定状态，使得不同像素对应的像素驱动电路中，驱动模块203的输出端电流值均处于预设范围，因此位于显示面板不同位置的发光器件的阴极，受到电源压降的影响较小，从而显示面板各处的显示亮度均匀，提高了显示效果。
图8示出了综合补偿的流程示意图，具体包括以下步骤：
S10：开始。
S20：外部侦测：第一电源信号输入端和第二电源信号输入端输入信号反转，侦测获得外补时间段的阈值电压漂移量Vth。
在通常情况下，第一电源信号输入端V+输入的是电源高电位信号VDD，第二电源信号输入端V-输入的是电源低电位信号VSS，在外部侦测时，也即第一侦测时间段，将第一电源信号输入端和第二电源信号输入端输入信号反转，第一电源信号输入端V+输入电源低电位信号VSS，第二电源信号输入端V-输入电源高电位信号VDD，因此发光器件202的阳极接入电源低电位信号VSS，由于发光器件202只能单向导通，当阳极电压低于阴极电压时，发光器件202会立即截止，不会有电流从发光器件202中漏出，对侦测模块204的侦测结果造成影响，因此提高了侦测的准确度，在补偿后补偿效果更佳，显示效果更好。
在该步骤中，侦测模块204在第三控制信号RD-E的控制下，获得外补时间段的阈值电压漂移量Vth，也即第一阈值电压Vth。
S30：外补：根据Vth数据生成补偿数据，并存储到Flash等存储单元。
在该步骤中，在获取第一阈值电压Vth后，根据Vth的数值计算出在显示时间段需要补偿的数据，然后将该数据存储到Flash等存储单元中。
S40：内补：第一电源信号输入端和第二电源信号输入端输入信号恢复，进行内部补偿和驱动，并将存储的Vth补偿数据叠加到内补Vdata2和Vref中，对新增的阈值电压漂移量Vth’进行侦测和补偿，从而实现混合补偿方案。
在该步骤中，将第一电源信号输入端和第二电源信号输入端输入信号恢复，即第一电源信号输入端V+仍然输入电源高电位信号VDD，第二电源信号输入端V-仍然输入电源低电位信号VSS，然后，通过控制各输入信号的电位高低，在第二侦测时间段的第二侦测阶段，向第一点输入补偿后的参考数据信号Vref+Vth，在显示时间段的数据写入阶段，向第一点输入补偿后的第二数据信号Vdata2+Vth，以此对新增的阈值电压漂移量Vth’，也即第二阈值电压Vth’进行侦测和补偿，从而实现外部加内补的混合补偿方案。
S50：结束。
由上述实施例可知，本申请的像素驱动电路在第一侦测时间段和第二侦测时间段均对驱动模块203的阈值电压进行侦测，并在显示时间段进行综合补偿，因此补偿效果较佳。在本申请的像素驱动电路中，显示面板中所有发光器件202的阳极均连接在一起，阴极均与驱动模块203的输出端连接，在发光阶段，不同子像素对应的像素驱动电路中，驱动模块203的输出端电压值均处于预设范围，即位于显示面板不同位置的发光器件202的阴极的电压值处于预设范围，因此各发光器件202受电源压降的影响较小，从而使得显示面板各处的显示亮度均匀，此外，在第一侦测时间段，发光器件202的阳极接入电源低电位信号VSS，可以直接将发光器件202截止，避免了发光器件202向侦测模块204漏电，从而提高了侦测准确度。
本申请还提供一种显示面板，包括上述任一实施例所述的像素驱动电路。通过采用本申请实施例提供的像素驱动电路，各发光器件的阴极电压受到电源压降的影响较小，从而显示面板各处的显示亮度均匀。
根据以上实施例可知：
本申请实施例提供一种像素驱动电路和显示面板，像素驱动电路包括数据信号输入模块、发光器件、驱动模块、侦测模块和存储模块；数据信号输入模块用于第一侦测时间段，在第一控制信号的控制下，向第一点输入第一数据信号，第一侦测时间段为开机之前或关机之后的非显示时间段；发光器件的阳极与第一电源信号输入端连接；驱动模块的第一输入端通过第一点与数据信号输入模块连接，驱动模块的第二输入端与第二电源信号输入端连接，驱动模块的输出端与发光器件的阴极连接，驱动模块用于在第二控制信号和第一点的电位控制下，驱动发光器件发光；侦测模块通过第二点与驱动模块的第三输入端连接，通过第三点与驱动模块的输出端连接，用于在第一侦测阶时间段，在第三控制信号的控制下，侦测驱动模块的第一阈值电压，在第二侦测时间段，在第四控制信号的控制下，侦测驱动模块的第二阈值电压，第二侦测时间段为相邻显示帧之间的空白时间段；存储模块通过第一点和第二点与驱动模块连接，用于存储驱动模块的第一阈值电压和第二阈值电压；其中，数据输入模块还用于，根据侦测模块侦测到的第一阈值电压，在显示时间段的数据写入阶段，向第一点输入补偿后的第二数据信号；驱动模块还用于，根据第二数据信号和侦测模块侦测到的第二阈值电压，在显示时间段的发光阶段，向发光器件输入驱动电流，驱动电流与第一阈值电压和第二阈值电压的数值无关；在第一侦测时间段，第一电源信号输入端接入电源低电位信号，第二电源信号输入端接入电源高电位信号，在第二侦测时间段和显示时间段，第一电源信号输入端接入电源高电位信号，第二电源信号输入端接入电源低电位信号，且在显示时间段的发光阶段，不同子像素对应的像素驱动电路中，驱动模块的输出端电压值均处于预设范围。本申请的像素驱动电路中，显示面板中所有发光器件的阳极均连接在一起，阴极均与驱动模块的输出端连接，在发光阶段，不同子像素对应的像素驱动电路中，驱动模块的输出端电压值均处于预设范围，即位于显示面板不同位置的发光器件的阴极的电压值处于预设范围，因此各发光器件受电源压降的影响较小，从而使得显示面板各处的显示亮度均匀，此外，在第一侦测时间段，发光器件的阳极接入电源低电位信号，可以直接将发光器件截止，避免了发光器件向侦测模块漏电，从而提高了侦测准确度。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
以上对本申请实施例所提供的一种像素驱动电路和显示面板进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (20)

  1. 一种像素驱动电路，其包括：
    数据信号输入模块，用于第一侦测时间段，在第一控制信号的控制下，向第一点输入第一数据信号，所述第一侦测时间段为开机之前或关机之后的非显示时间段；
    发光器件，所述发光器件的阳极与第一电源信号输入端连接；
    驱动模块，所述驱动模块的第一输入端通过所述第一点与所述数据信号输入模块连接，所述驱动模块的第二输入端与第二电源信号输入端连接，所述驱动模块的输出端与所述发光器件的阴极连接，所述驱动模块用于在第二控制信号和所述第一点的电位控制下，驱动所述发光器件发光；
    侦测模块，通过第二点与所述驱动模块的第三输入端连接，通过第三点与所述驱动模块的输出端连接，用于在所述第一侦测阶时间段，在第三控制信号的控制下，侦测所述驱动模块的第一阈值电压，在第二侦测时间段，在第四控制信号的控制下，侦测所述驱动模块的第二阈值电压，所述第二侦测时间段为相邻显示帧之间的空白时间段；
    存储模块，通过所述第一点和所述第二点与所述驱动模块连接，用于存储所述驱动模块的第一阈值电压和第二阈值电压；
    其中，所述数据输入模块还用于，根据所述侦测模块侦测到的第一阈值电压，在所述显示时间段的数据写入阶段，向所述第一点输入补偿后的第二数据信号；所述驱动模块还用于，根据所述第二数据信号和所述侦测模块侦测到的第二阈值电压，在所述显示时间段的发光阶段，向所述发光器件输入驱动电流，所述驱动电流与所述第一阈值电压和所述第二阈值电压的数值无关；在所述第一侦测时间段，所述第一电源信号输入端接入电源低电位信号，所述第二电源信号输入端接入电源高电位信号，在所述第二侦测时间段和所述显示时间段，所述第一电源信号输入端接入电源高电位信号，所述第二电源信号输入端接入电源低电位信号，且在所述显示时间段的发光阶段，不同子像素对应的像素驱动电路中，所述驱动模块的输出端电压值均处于预设范围。
  2. 如权利要求1所述的像素驱动电路，其中，所述数据信号输入模块包括第一晶体管，所述第一晶体管的栅极接入所述第一控制信号，所述第一晶体管的第一电极与数据线连接，所述第一晶体管的第二电极与所述第一点连接。
  3. 如权利要求2所述的像素驱动电路，其中，所述发光器件包括发光二极管或有机发光二极管。
  4. 如权利要求3所述的像素驱动电路，其中，所述驱动模块包括第二晶体管和第三晶体管，所述第二晶体管的栅极与所述第一点连接，所述第二晶体管的第一电极与所述第三晶体管的第二电极连接于所述第二点，所述第二晶体管的第二电极与所述发光器件的阴极连接于所述第三点，所述第三晶体管的栅极接入所述第二控制信号，所述第三晶体管的第一电极接入所述第二电源信号输入端。
  5. 如权利要求4所述的像素驱动电路，其中，所述侦测模块包括第四晶体管、第五晶体管、感测线和选择开关，所述第四晶体管的栅极接入所述第三控制信号，所述第四晶体管的第一电极与所述感测线连接，所述第四晶体管的第二电极与所述第三点连接，所述第五晶体管的栅极接入所述第四控制信号，所述第五晶体管的第一电极与所述感测线连接，所述第五晶体管的第二电极与所述第二点连接，所述选择开关的动触点与所述感测线连接，所述选择开关的第一静触点与控制电压输入端连接，所述选择开关的第二静触点与模数转换器连接。
  6. 如权利要求5所述的像素驱动电路，其中，所述存储模块包括存储电容，所述存储电容的第一极板与所述第一点连接，所述存储电容的第二极板与所述第二点连接。
  7. 如权利要求6所述的像素驱动电路，其中，在所述第一侦测时间段，所述第三控制信号为高电位，所述第四控制信号为低电位。
  8. 如权利要求7所述的像素驱动电路，其中，所述第一侦测时间段包括初始化阶段、充电阶段和第一侦测阶段，所述侦测模块用于，在所述初始化阶段，控制所述选择开关的动触点与第一静触点连接，在所述充电阶段，控制所述选择开关的动触点与第一静触点和所述第二静触点均断开，在所述第一侦测阶段，控制所述选择开关的动触点与第二静触点连接。
  9. 如权利要求8所述的像素驱动电路，其中，在所述初始化阶段，所述控制电压输入端输入参考电压信号。
  10. 如权利要求6所述的像素驱动电路，其中，所述第二侦测时间段包括复位阶段和第二侦测阶段，在所述复位阶段，所述第三控制信号为低电位，所述第四控制信号为高电位，在所述第二侦测阶段，所述第三控制信号和所述第四控制信号均为低电位。
  11. 如权利要求10所述的像素驱动电路，其中，所述侦测模块用于，在所述复位阶段，控制所述选择开关的动触点与第一静触点连接。
  12. 如权利要求11所述的像素驱动电路，其中，在所述复位阶段，所述控制电压输入端输入初始电压信号。
  13. 如权利要求10所述的像素驱动电路，其中，所述数据输入模块用于，在所述第二侦测阶段，根据所述侦测模块侦测到的第一阈值电压，向所述第一点输入补偿后的参考数据信号。
  14. 如权利要求6所述的像素驱动电路，其中，在所述显示时间段，所述第三控制信号和所述第四控制信号均为低电位。
  15. 一种显示面板，其包括像素驱动电路，所述像素驱动电路包括：
    数据信号输入模块，用于第一侦测时间段，在第一控制信号的控制下，向第一点输入第一数据信号，所述第一侦测时间段为开机之前或关机之后的非显示时间段；
    发光器件，所述发光器件的阳极与第一电源信号输入端连接；
    驱动模块，所述驱动模块的第一输入端通过所述第一点与所述数据信号输入模块连接，所述驱动模块的第二输入端与第二电源信号输入端连接，所述驱动模块的输出端与所述发光器件的阴极连接，所述驱动模块用于在第二控制信号和所述第一点的电位控制下，驱动所述发光器件发光；
    侦测模块，通过第二点与所述驱动模块的第三输入端连接，通过第三点与所述驱动模块的输出端连接，用于在所述第一侦测阶时间段，在第三控制信号的控制下，侦测所述驱动模块的第一阈值电压，在第二侦测时间段，在第四控制信号的控制下，侦测所述驱动模块的第二阈值电压，所述第二侦测时间段为相邻显示帧之间的空白时间段；
    存储模块，通过所述第一点和所述第二点与所述驱动模块连接，用于存储所述驱动模块的第一阈值电压和第二阈值电压；
    其中，所述数据输入模块还用于，根据所述侦测模块侦测到的第一阈值电压，在所述显示时间段的数据写入阶段，向所述第一点输入补偿后的第二数据信号；所述驱动模块还用于，根据所述第二数据信号和所述侦测模块侦测到的第二阈值电压，在所述显示时间段的发光阶段，向所述发光器件输入驱动电流，所述驱动电流与所述第一阈值电压和所述第二阈值电压的数值无关；在所述第一侦测时间段，所述第一电源信号输入端接入电源低电位信号，所述第二电源信号输入端接入电源高电位信号，在所述第二侦测时间段和所述显示时间段，所述第一电源信号输入端接入电源高电位信号，所述第二电源信号输入端接入电源低电位信号，且在所述显示时间段的发光阶段，不同子像素对应的像素驱动电路中，所述驱动模块的输出端电压值均处于预设范围。
  16. 如权利要求15所述的显示面板，其中，所述数据信号输入模块包括第一晶体管，所述第一晶体管的栅极接入所述第一控制信号，所述第一晶体管的第一电极与数据线连接，所述第一晶体管的第二电极与所述第一点连接。
  17. 如权利要求16所述的显示面板，其中，所述发光器件包括发光二极管或有机发光二极管。
  18. 如权利要求17所述的像素驱动电路，其中，所述驱动模块包括第二晶体管和第三晶体管，所述第二晶体管的栅极与所述第一点连接，所述第二晶体管的第一电极与所述第三晶体管的第二电极连接于所述第二点，所述第二晶体管的第二电极与所述发光器件的阴极连接于所述第三点，所述第三晶体管的栅极接入所述第二控制信号，所述第三晶体管的第一电极接入所述第二电源信号输入端。
  19. 如权利要求18所述的显示面板，其中，所述侦测模块包括第四晶体管、第五晶体管、感测线和选择开关，所述第四晶体管的栅极接入所述第三控制信号，所述第四晶体管的第一电极与所述感测线连接，所述第四晶体管的第二电极与所述第三点连接，所述第五晶体管的栅极接入所述第四控制信号，所述第五晶体管的第一电极与所述感测线连接，所述第五晶体管的第二电极与所述第二点连接，所述选择开关的动触点与所述感测线连接，所述选择开关的第一静触点与控制电压输入端连接，所述选择开关的第二静触点与模数转换器连接。
  20. 如权利要求19所述的显示面板，其中，所述存储模块包括存储电容，所述存储电容的第一极板与所述第一点连接，所述存储电容的第二极板与所述第二点连接。
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