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WO2018184514A1 - 像素补偿电路、驱动方法、有机发光显示面板及显示装置 - Google Patents

像素补偿电路、驱动方法、有机发光显示面板及显示装置 Download PDF

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Publication number
WO2018184514A1
WO2018184514A1 PCT/CN2018/081624 CN2018081624W WO2018184514A1 WO 2018184514 A1 WO2018184514 A1 WO 2018184514A1 CN 2018081624 W CN2018081624 W CN 2018081624W WO 2018184514 A1 WO2018184514 A1 WO 2018184514A1
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Prior art keywords
transistor
module
voltage
driving transistor
threshold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2018/081624
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English (en)
French (fr)
Inventor
刘颖
王鑫
张晓萍
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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Application filed by BOE Technology Group Co Ltd, Beijing BOE Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US16/093,418 priority Critical patent/US10714010B2/en
Publication of WO2018184514A1 publication Critical patent/WO2018184514A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • 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
    • 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
    • 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
    • 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
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • 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
    • G09G2300/0842—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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a pixel compensation circuit, a driving method, an organic light emitting display panel, and a display device.
  • OLED Organic Light Emitting Diode
  • LCD liquid crystal display
  • OLED display has low energy consumption, low production cost and self-illumination. Wide viewing angle and fast response, etc.
  • OLED displays have begun to replace traditional LCD displays.
  • the pixel compensation circuit design for controlling the illumination of the light-emitting device is the core technical content of the OLED display, and has important research significance.
  • Embodiments of the present disclosure provide a pixel compensation circuit, a driving method, an organic light emitting display panel, and a display device.
  • the specific scheme is as follows:
  • a pixel compensation circuit provided by the embodiment of the present disclosure includes: a threshold compensation module, a storage module, an illumination control module, a driving transistor, and a light emitting device; wherein
  • the threshold compensation module is respectively connected to the data signal end, the scan signal end and the control electrode of the drive transistor, and the threshold compensation module is configured to, under the control of the scan signal end, the voltage and the threshold of the data signal end a compensation voltage is supplied to the control electrode of the driving transistor; wherein a difference between the threshold compensation voltage and a threshold voltage of the driving transistor is within a set range;
  • the memory module is respectively connected to a control electrode of the driving transistor and a first power terminal, and the memory module is configured to store a voltage of a gate of the driving transistor;
  • the illumination control module is respectively connected to the illumination control signal end, the second pole of the driving transistor, and the light emitting device, and the first pole of the driving transistor is connected to the first power terminal; the illumination control module is And configured to turn on the second pole of the driving transistor and the light emitting device under the control of the light emitting control signal end, so that the driving transistor drives the light emitting device to emit light.
  • the threshold compensation voltage is equal to a threshold voltage of the driving transistor.
  • the compensation submodule is respectively connected to the data signal end and the transmission submodule, and the compensation submodule is configured to use the data signal.
  • the voltage of the terminal and the threshold compensation voltage are provided to the transmission submodule;
  • the transmission sub-module is further connected to the scan signal end and the control electrode of the driving transistor, respectively, the transmission sub-module is configured to transmit the voltage provided by the compensation sub-module under the control of the scanning signal end A control electrode for the drive transistor.
  • the compensation submodule includes: a threshold compensation transistor; wherein a threshold voltage of the threshold compensation transistor is equal to the threshold compensation voltage; and the threshold compensation
  • the control electrode of the transistor and its first pole are both connected to the data signal end, and the second pole of the threshold compensation transistor is connected to the transmission sub-module.
  • the threshold compensation transistor and the driving transistor are both P-type transistors or N-type transistors.
  • the threshold compensation transistor is disposed adjacent to the driving transistor.
  • the size of the threshold compensation transistor is the same as the size of the driving transistor.
  • the transmission submodule includes: a first switching transistor; wherein a control pole of the first switching transistor is connected to the scan signal end, A first pole of the first switching transistor is coupled to the compensation sub-module, and a second pole of the first switching transistor is coupled to a control electrode of the driving transistor.
  • the memory module includes: a capacitor; wherein the first end of the capacitor is connected to the first power terminal, and the second end of the capacitor is The control electrodes of the drive transistors are connected.
  • the illumination control module includes: a second switching transistor; wherein
  • a control pole of the second switching transistor is connected to the light emission control signal end, a first pole of the second switching transistor is connected to a second pole of the driving transistor, and a second pole of the second switching transistor is The first end of the light emitting device is connected, and the second end of the light emitting device is connected to the second power end.
  • an organic light emitting display panel provided by an embodiment of the present disclosure includes any of the above pixel compensation circuits provided by the embodiments of the present disclosure.
  • a display device provided by an embodiment of the present disclosure includes the above-described organic light emitting display panel provided by the embodiment of the present disclosure.
  • a method for driving a pixel compensation circuit includes: a data writing phase and an illuminating phase;
  • the threshold compensation module supplies the voltage of the data signal end and the threshold compensation voltage to the control pole of the driving transistor under the control of the scanning signal end;
  • the storage module stores a voltage of a control electrode of the driving transistor;
  • the storage module stores a voltage of a control pole of the driving transistor; the illuminating control module turns on a second pole of the driving transistor and the illuminating under the control of the illuminating control signal end And a device that causes the driving transistor to drive the light emitting device to emit light.
  • 1a is a schematic structural diagram of a pixel compensation circuit according to an embodiment of the present disclosure
  • 1b is another schematic structural diagram of a pixel compensation circuit according to an embodiment of the present disclosure.
  • FIG. 2a is a schematic structural diagram of another embodiment of a pixel compensation circuit according to an embodiment of the present disclosure
  • 2b is a schematic structural diagram of still another pixel compensation circuit according to an embodiment of the present disclosure.
  • FIG. 3a is a schematic diagram of a specific structure of the pixel compensation circuit shown in FIG. 2a;
  • FIG. 3b is another schematic structural diagram of the pixel compensation circuit shown in FIG. 2a; FIG.
  • FIG. 4a is a schematic diagram of a specific structure of the pixel compensation circuit shown in FIG. 2b;
  • 4b is another schematic structural diagram of the pixel compensation circuit shown in FIG. 2b;
  • Figure 5a is a timing diagram of the pixel compensation circuit shown in Figure 3a;
  • Figure 5b is a timing diagram of the pixel compensation circuit shown in Figure 4a;
  • FIG. 6 is a flowchart of a driving method according to an embodiment of the present disclosure.
  • the embodiment of the present disclosure provides a pixel compensation circuit, as shown in FIG. 1a and FIG. 1b, including: a threshold compensation module 10, a storage module 20, an illumination control module 30, a driving transistor DT1, and a light emitting device L;
  • the threshold compensation module 10 is respectively connected to the data signal terminal DA, the scan signal terminal SC and the control electrode G of the driving transistor DT1.
  • the threshold compensation module 10 is configured to compensate the voltage of the data signal terminal DA and the threshold value under the control of the scanning signal terminal SC.
  • the voltage is supplied to the control electrode G of the driving transistor DT1; wherein the difference between the threshold compensation voltage and the threshold voltage of the driving transistor is within a set range;
  • the memory module 20 is respectively connected to the gate electrode G of the driving transistor DT1 and the first power terminal VDD, and the memory module 20 is configured to store the voltage of the gate electrode G of the driving transistor DT1;
  • the illumination control module 30 is respectively connected to the illumination control signal terminal EM, the second pole m2 of the driving transistor DT1, and the light emitting device L.
  • the first pole m1 of the driving transistor D is connected to the first power terminal VDD; the illumination control module 30 is configured to be Under the control of the light-emission control signal terminal EM, the second electrode m2 of the driving transistor DT1 is turned on to the light-emitting device L, and the light-emitting device L drivingly connected to the driving transistor DT1 is caused to emit light.
  • the pixel compensation circuit includes: a threshold compensation module, a storage module, an illumination control module, a driving transistor, and a light emitting device; wherein the threshold compensation module is configured to set a voltage and a threshold of the data signal end in a data writing phase a compensation voltage is provided to a control electrode of the driving transistor; the memory module is configured to store a voltage of a control electrode of the driving transistor in a data writing phase and an emission phase; the light emission control module is configured to turn on a second electrode of the driving transistor during the light emitting phase The light emitting device causes the driving transistor to drive the connected light emitting device to emit light.
  • the above-mentioned pixel compensation circuit provided by the embodiment of the present disclosure can realize the compensation of the threshold voltage of the driving transistor by a simple structure and a simple timing and a small signal line by the mutual cooperation of the above three modules, thereby Simplifying the preparation process, reducing the production cost, and reducing the occupied area are beneficial to the design of high-resolution OLED display panels.
  • the setting range refers to the range of error tolerance, and the smaller the difference between the threshold compensation voltage and the threshold voltage of the driving transistor, the more the threshold voltage of the driving transistor can be Effective compensation is performed, and therefore, optionally, the threshold compensation voltage is equal to the threshold voltage of the drive transistor.
  • the driving transistor DT1 may be a P-type transistor.
  • the gate of the P-type transistor is the gate G of the driving transistor DT1.
  • the source of the P-type transistor drives the first pole m1 of the transistor DT1, and the drain of the P-type transistor is the second pole m2 of the driving transistor DT1.
  • the operating current for driving the light-emitting device L to emit light flows from the source of the P-type transistor to the drain thereof.
  • the driving transistor DT1 may be an N-type transistor.
  • the gate of the N-type transistor is the gate G of the driving transistor DT1.
  • the drain of the N-type transistor is the first pole m1 of the driving transistor DT1, and the source of the N-type transistor drives the second pole m2 of the transistor DT1.
  • the operating current for driving the light-emitting device L to emit light flows from the drain of the N-type transistor to its source.
  • the threshold compensation module 10 may specifically include: a compensation sub-module 11 and a transmission sub-module 12;
  • the compensation sub-module 11 is respectively connected to the data signal terminal DA and the transmission sub-module 12, the compensation sub-module 11 is configured to provide the voltage of the data signal terminal DA and the threshold compensation voltage to the transmission sub-module 12;
  • the transmission sub-module 12 is also respectively connected to the scan signal terminal SC and the control electrode G of the driving transistor DT1, and the transmission sub-module 12 is configured to transmit the voltage provided by the compensation sub-module 11 to the driving transistor DT1 under the control of the scanning signal SC. Control electrode G.
  • the voltage V data of the data signal terminal DA and the threshold voltage V th (DT1) of the driving transistor satisfy the formula: V data >
  • the compensation sub-module 11 may include: a threshold compensation transistor DT2; wherein the threshold voltage of the threshold compensation transistor DT2 is equal to the threshold compensation
  • the voltage and the control electrode of the threshold compensation transistor DT2 are connected to the data signal terminal DA, and the second electrode of the threshold compensation transistor DT2 is connected to the transmission sub-module 12.
  • the threshold compensation transistor DT2 may be a P-type transistor.
  • the gate of the P-type transistor is the gate of the threshold compensation transistor DT2.
  • the source of the P-type transistor is the first pole of the threshold compensation transistor DT2
  • the drain of the P-type transistor is the second pole of the threshold compensation transistor DT2.
  • the current of the signal of the data signal terminal DA flows from the source of the P-type transistor to its drain.
  • the threshold compensation transistor DT2 may be an N-type transistor.
  • the gate of the N-type transistor is the gate of the threshold compensation transistor DT2.
  • the source of the N-type transistor is the second pole of the threshold compensation transistor DT2, and the drain of the N-type transistor is the first pole of the threshold compensation transistor DT2. At this time, the current of the signal of the data signal terminal DA flows from the drain of the P-type transistor to its source.
  • the threshold compensation transistor DT2 is made to have the same transistor characteristics as the driving transistor DT1 within the error tolerance range, for example, the threshold voltage thereof is the same.
  • the layout positions of the threshold compensation transistor DT2 and the driving transistor DT1 can be made closer and set to the same size to ensure that the transistor characteristics are the same within the error tolerance range.
  • the characteristics of the threshold compensation transistor DT2 and the driving transistor DT1 need to be determined according to the actual application environment, which is not limited herein.
  • the threshold compensation transistor DT2 is disposed adjacent to the driving transistor DT1, and the size of the threshold compensation transistor DT2 is the same as the size of the driving transistor DT2.
  • the threshold compensation transistor since the control electrode of the threshold compensation transistor and the first pole thereof are connected to the data signal end to form a diode connection manner, in the data writing phase, when the data signal end has a data voltage V tada for display, the threshold compensation transistor is turned on and inputs a signal to the transmission sub-module until the voltage of the second pole of the threshold compensation transistor becomes: V data -
  • the transmission sub-module 12 may include: a first switching transistor M1;
  • the control electrode of the first switching transistor M1 is connected to the scanning signal terminal SC, the first pole of the first switching transistor M1 is connected to the compensation sub-module 11, and the second electrode of the first switching transistor M1 is connected to the control electrode G of the driving transistor DT1.
  • the first switching transistor M1 may be a P-type transistor.
  • the first switching transistor M1 may be an N-type transistor, which is not limited herein.
  • the voltage of the first pole thereof, that is, the compensation submodule output may be output.
  • the voltage is supplied to the gate electrode G of the driving transistor DT1.
  • the illumination control module 30 may include: a second switching transistor M2;
  • the control electrode of the second switching transistor M2 is connected to the light emission control signal terminal EM, the first electrode of the second switching transistor M2 is connected to the second electrode m2 of the driving transistor DT1, and the second electrode of the second switching transistor M2 is connected to the light emitting device L.
  • the first end is connected, and the second end of the light emitting device L is connected to the second power terminal VSS.
  • the second switching transistor may be a P-type transistor; or, as shown in FIG. 3b and FIG. 4a, the second switch The transistor may be an N-type transistor, which is not limited herein.
  • the second switching transistor M2 when the second switching transistor M2 is in an on state under the control of the light emission control signal end, the second electrode of the driving transistor DT1 and the first of the light emitting device L are The terminal is turned on to supply a current output from the second electrode of the driving transistor DT1 to the light emitting device L to drive the light emitting device L to emit light.
  • the memory module 20 may specifically include: a capacitor C; wherein the first end of the capacitor C is first The power terminal VDD is connected, and the second terminal of the capacitor C is connected to the control electrode G of the driving transistor DT1.
  • the capacitor C can be charged under the control of the first power terminal VDD and the control electrode of the driving transistor DT1, and is driven by the bootstrap action of the capacitor C.
  • the gate of the transistor DT1 is in a floating state, the voltage difference across the two ends can be kept stable, thereby storing the charged voltage.
  • the voltage V dd of the first power terminal VDD is greater than the voltage V ss of the second power terminal VSS.
  • the light emitting device L is generally an organic electroluminescent diode, which realizes light emission under the action of the current when the driving transistor DT1 is in a saturated state.
  • the anode of the organic electroluminescent diode is the first end of the light emitting device L, and the cathode is the second end of the light emitting device L.
  • each module in the pixel compensation circuit provided by the embodiment of the present disclosure.
  • the specific structure of each module is not limited to the foregoing structure provided by the embodiment of the present disclosure, and may also be known to those skilled in the art. Other structures are not limited herein.
  • the driving transistor DT1 is a P-type transistor
  • the threshold compensation transistor DT2 is a P-type transistor
  • all The switching transistors are all P-type transistors.
  • the driving transistor DT1 is an N-type transistor
  • the threshold compensation transistor DT2 is an N-type transistor
  • all of the switching transistors are N-type transistors, which are not limited herein.
  • the P-type switching transistor is turned off under a high potential and turned on under a low potential; the N-type switching transistor is turned on at a high potential, and is low. Cut off under the action of potential.
  • the driving transistor and the switching transistor may be a thin film transistor (TFT) or a metal oxide semiconductor field effect transistor (MOS, Metal Oxide). Semiconductor), here is not limited.
  • TFT thin film transistor
  • MOS metal oxide semiconductor field effect transistor
  • the control of these switching transistors is extremely gated, and the first pole can be used as the source or the drain according to the type of the switching transistor and the signal of the signal terminal, and the second pole thereof can be used as the drain or the source. It is not limited here.
  • the driving transistor and the switching transistor are exemplified as MOS transistors.
  • the driving transistor DT1 and the threshold compensation transistor DT2 and all of the switching transistors are P-type transistors; the corresponding input timing diagram is as shown in FIG. 5a. Specifically, two stages of T1 and T2 in the input timing diagram shown in FIG. 5a are selected.
  • the threshold compensation transistor DT2 Since the gate of the threshold compensation transistor DT2 and its source are both connected to the data signal terminal DA to form a diode connection structure, the threshold compensation transistor DT2 is turned on by the data voltage V data of the data signal terminal DA until the threshold compensation transistor DT2 leaks. When the voltage of the pole becomes V data -
  • the turned-on first switching transistor M1 supplies the voltage V data ⁇
  • the turned-on second switching transistor M2 turns on the drain D of the driving transistor DT1 and the light emitting device L, and supplies the current of the drain of the driving transistor DT1 to the light emitting device L.
  • the current I L of the drain of the driving transistor DT1 is the current when it is in a saturated state. According to the saturation state current characteristic, the current I L satisfies the formula:
  • I L K(V GS -
  • ) 2 K(V dd -V data +V th (DT2)-
  • ) K(V dd -V data ); among them, ⁇ is the mobility of the driving transistor DT1, and Cox is the gate oxide capacitance per unit area.
  • the operating current I L that drives the crystal DT1 to drive the light-emitting device L to emit light is only related to the voltage V Data of the data signal terminal DA and the voltage V dd of the first power supply terminal VDD, and the threshold voltage V th (DT1) of the driving transistor DT1.
  • the influence of the threshold voltage V th (DT1) drift on the operating current of the driving light-emitting device L due to the process process of the driving transistor DT1 and the long-time operation can be solved, so that the operating current of the light-emitting device L is kept stable, thereby ensuring The normal operation of the light emitting device L.
  • the driving transistor DT1 and the threshold compensation transistor DT2 and all of the switching transistors are N-type transistors; the corresponding input timing diagram is as shown in FIG. 5b. Specifically, two stages of T1 and T2 in the input timing diagram shown in FIG. 5a are selected.
  • the threshold compensation transistor DT2 Since the gate of the threshold compensation transistor DT2 and its drain are both connected to the data signal terminal DA to form a diode connection structure, the threshold compensation transistor DT2 is turned on by the data voltage V data of the data signal terminal DA until the source of the threshold compensation transistor DT2 When the voltage of the pole becomes V data -
  • the turned-on first switching transistor M1 supplies the voltage V data -
  • the turned-on second switching transistor M2 turns on the source D of the driving transistor DT1 and the light emitting device L, and supplies the current of the source of the driving transistor DT1 to the light emitting device L.
  • the current I L of the source of the driving transistor DT1 is a current when it is in a saturated state. According to the current characteristic of the saturated state, the current I L satisfies the formula:
  • I L K(V GS -
  • ) 2 K(V dd -V data +V th (DT2)-
  • ) K(V dd -V data ); among them, ⁇ is the mobility of the driving transistor DT1, and Cox is the gate oxide capacitance per unit area.
  • the operating current I L that drives the crystal DT1 to drive the light-emitting device L to emit light is only related to the voltage V Data of the data signal terminal DA and the voltage V dd of the first power supply terminal VDD, and the threshold voltage V th (DT1) of the driving transistor DT1.
  • the influence of the threshold voltage V th (DT1) drift on the operating current of the driving light-emitting device L due to the process process of the driving transistor DT1 and the long-time operation can be solved, so that the operating current of the light-emitting device L is kept stable, thereby ensuring The normal operation of the light emitting device L.
  • the above-mentioned pixel compensation circuit provided by the embodiment of the present disclosure can realize the driving by a simple structure, that is, only through two switching transistors, a capacitor, and a threshold voltage of the threshold voltage of the driving transistor with the same threshold voltage.
  • the compensation function of the threshold voltage of the transistor can simplify the preparation process, reduce the production cost, and reduce the occupied area, thereby facilitating the design of the high-resolution OLED display panel.
  • the pixel compensation circuit of the present application does not need to additionally provide a switching transistor and a signal terminal for initializing the gate of the driving transistor, thereby reducing the driving IC (for example, driving the scanning circuit).
  • the driving capability requirements can reduce the size of the transistors in the driving IC and reduce the space occupied by the driving IC, thereby making the frame of the display panel narrower. Moreover, since the pixel compensation circuit in the present application can at least reduce the signal line for inputting the initialization signal, the resolution of the display panel can be improved.
  • an embodiment of the present disclosure further provides a driving method of any one of the above-mentioned pixel compensation circuits according to an embodiment of the present disclosure. As shown in FIG. 6, the method includes: a data writing phase and a lighting phase;
  • the threshold compensation module supplies the voltage of the data signal end and the threshold compensation voltage to the control electrode of the driving transistor under the control of the scanning signal end;
  • the storage module stores the voltage of the control electrode of the driving transistor;
  • the storage module stores a voltage of a control electrode of the driving transistor.
  • the illuminating control module turns on the second pole of the driving transistor and the illuminating device under the control of the illuminating control signal end, so that the illuminating device driven by the driving transistor is illuminated.
  • the compensation function of the threshold voltage of the driving transistor can be realized by a simple timing.
  • the method further includes: the compensation sub-module provides the voltage of the data signal end and the threshold compensation voltage to the transmission sub-module; the transmission sub-module compensates the sub-module The supplied voltage is transferred to the gate of the drive transistor.
  • an embodiment of the present disclosure further provides an organic light emitting display panel, including any of the above pixel compensation circuits provided by the embodiments of the present disclosure.
  • the principle of solving the problem is similar to the foregoing pixel compensation circuit. Therefore, the implementation of the organic light-emitting display panel can be referred to the implementation of the foregoing pixel compensation circuit, and the repeated description is not repeated herein.
  • an embodiment of the present disclosure further provides a display device including the above-described organic light emitting display panel provided by an embodiment of the present disclosure.
  • the display device can 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.
  • Other indispensable components of the display device are understood by those skilled in the art, and are not described herein, nor should they be construed as limiting the disclosure.
  • the pixel compensation circuit, the driving method, the organic light emitting display panel, and the display device provided by the embodiment of the present disclosure include: a threshold compensation module, a storage module, an illumination control module, a driving transistor, and a light emitting device; wherein the threshold compensation module is configured to be in the data
  • the writing phase supplies the voltage of the data signal terminal and the threshold compensation voltage to the control electrode of the driving transistor;
  • the memory module is configured to store the voltage of the control electrode of the driving transistor in the data writing phase and the light emitting phase;
  • the light emission control module is configured to emit light
  • the phase turns on the second electrode of the driving transistor and the light emitting device to cause the driving device to drive the connected light emitting device to emit light.
  • the above-mentioned pixel compensation circuit provided by the embodiment of the present disclosure can realize the compensation of the threshold voltage of the driving transistor by a simple structure and a simple timing and a small signal line by the mutual cooperation of the above three modules, thereby Simplifying the preparation process, reducing the production cost, and reducing the occupied area are beneficial to the design of high-resolution OLED display panels.

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Abstract

公开了一种像素补偿电路、驱动方法、有机发光显示面板及显示装置，包括：阈值补偿模块、存储模块、发光控制模块、驱动晶体管以及发光器件；阈值补偿模块被配置为在数据写入阶段将数据信号端的电压以及阈值补偿电压提供给驱动晶体管的控制极；存储模块被配置为在数据写入阶段与发光阶段存储驱动晶体管的控制极的电压；发光控制模块被配置为在发光阶段导通驱动晶体管的第二极与发光器件，使驱动晶体管驱动连接的发光器件发光。通过上述三个模块的相互配合，通过简单的结构与简单的时序以及较少的信号线来实现驱动晶体管的阈值电压的补偿，从而简化制备工艺、降低生产成本以及减小占用面积，有利于高分辨率的显示面板的设计。

Description

像素补偿电路、驱动方法、有机发光显示面板及显示装置
本申请要求在2017年4月7日提交中国专利局、申请号为201710224136.4、发明名称为“像素补偿电路、驱动方法、有机发光显示面板及显示装置”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，特别涉及一种像素补偿电路、驱动方法、有机发光显示面板及显示装置。
背景技术
有机电致发光显示器(Organic Light Emitting Diode，OLED)是当今平板显示器研究领域的热点之一，与液晶显示器(Liquid Crystal Display，LCD)相比，OLED显示器具有低能耗、生产成本低、自发光、宽视角及响应速度快等优点，目前，在手机、数码相机等显示领域，OLED显示器已经开始取代传统的LCD显示器。其中，用于控制发光器件发光的像素补偿电路设计是OLED显示器的核心技术内容，具有重要的研究意义。
发明内容
本公开实施例提供了一种像素补偿电路、驱动方法、有机发光显示面板及显示装置，具体方案如下：
本公开实施例提供的一种像素补偿电路，包括：阈值补偿模块、存储模块、发光控制模块、驱动晶体管以及发光器件；其中，
所述阈值补偿模块分别与数据信号端、扫描信号端以及所述驱动晶体管的控制极相连，所述阈值补偿模块被配置为在所述扫描信号端的控制下，将所述数据信号端的电压以及阈值补偿电压提供给所述驱动晶体管的控制极； 其中所述阈值补偿电压与所述驱动晶体管的阈值电压的差值在设定范围内；
所述存储模块分别与所述驱动晶体管的控制极以及第一电源端相连，所述存储模块被配置为存储所述驱动晶体管的控制极的电压；
所述发光控制模块分别与发光控制信号端、所述驱动晶体管的第二极以及所述发光器件相连，所述驱动晶体管的第一极与所述第一电源端相连；所述发光控制模块被配置为在所述发光控制信号端的控制下，导通所述驱动晶体管的第二极与所述发光器件，以使所述驱动晶体管驱动所述发光器件发光。
可选地，在本发明实施例提供的上述像素补偿电路中，所述阈值补偿电压等于所述驱动晶体管的阈值电压。
可选地，在本发明实施例提供的上述像素补偿电路中，所述补偿子模块分别与所述数据信号端以及所述传输子模块相连，所述补偿子模块被配置为将所述数据信号端的电压以及所述阈值补偿电压提供给所述传输子模块；
所述传输子模块还分别与所述扫描信号端以及所述驱动晶体管的控制极相连，所述传输子模块被配置为在所述扫描信号端的控制下，将所述补偿子模块提供的电压传输给所述驱动晶体管的控制极。
可选地，在本发明实施例提供的上述像素补偿电路中，所述补偿子模块包括：阈值补偿晶体管；其中，所述阈值补偿晶体管的阈值电压等于所述阈值补偿电压；并且所述阈值补偿晶体管的控制极与其第一极均与所述数据信号端相连，所述阈值补偿晶体管的第二极与所述传输子模块相连。
可选地，在本发明实施例提供的上述像素补偿电路中，所述阈值补偿晶体管与所述驱动晶体管均为P型晶体管或N型晶体管。
可选地，在本发明实施例提供的上述像素补偿电路中，所述阈值补偿晶体管与所述驱动晶体管相邻设置。
可选地，在本发明实施例提供的上述像素补偿电路中，所述阈值补偿晶体管的尺寸与所述驱动晶体管的尺寸相同。
可选地，在本发明实施例提供的上述像素补偿电路中，所述传输子模块包括：第一开关晶体管；其中，所述第一开关晶体管的控制极与所述扫描信 号端相连，所述第一开关晶体管的第一极与所述补偿子模块相连，所述第一开关晶体管的第二极与所述驱动晶体管的控制极相连。
可选地，在本发明实施例提供的上述像素补偿电路中，存储模块包括：电容；其中，所述电容的第一端与所述第一电源端相连，所述电容的第二端与所述驱动晶体管的控制极相连。
可选地，在本发明实施例提供的上述像素补偿电路中，所述发光控制模块包括：第二开关晶体管；其中，
所述第二开关晶体管的控制极与所述发光控制信号端相连，所述第二开关晶体管的第一极与所述驱动晶体管的第二极相连，所述第二开关晶体管的第二极与所述发光器件的第一端相连，所述发光器件的第二端与第二电源端相连。
相应地，本公开实施例提供的一种有机发光显示面板，包括本公开实施例提供的上述任一种像素补偿电路。
相应地，本公开实施例提供的一种显示装置，包括本公开实施例提供的上述有机发光显示面板。
相应地，本公开实施例提供的一种本公开实施例提供的上述任一种像素补偿电路的驱动方法，包括：数据写入阶段与发光阶段；其中，
在所述数据写入阶段，所述阈值补偿模块在所述扫描信号端的控制下，将所述数据信号端的电压以及所述阈值补偿电压提供给所述驱动晶体管的控制极；所述存储模块存储所述驱动晶体管的控制极的电压；
在所述发光阶段，所述存储模块存储所述驱动晶体管的控制极的电压；所述发光控制模块在所述发光控制信号端的控制下，导通所述驱动晶体管的第二极与所述发光器件，使所述驱动晶体管驱动所述发光器件发光。
附图说明
图1a为本公开实施例提供的像素补偿电路的一种结构示意图；
图1b为本公开实施例提供的像素补偿电路的另一种结构示意图；
图2a为本公开实施例提供的像素补偿电路的又一种结构示意图；
图2b为本公开实施例提供的像素补偿电路的又一种结构示意图；
图3a为图2a所示的像素补偿电路的一种具体结构示意图；
图3b为图2a所示的像素补偿电路的另一种具体结构示意图；
图4a为图2b所示的像素补偿电路的一种具体结构示意图；
图4b为图2b所示的像素补偿电路的另一种具体结构示意图；
图5a为图3a所示的像素补偿电路的时序图；
图5b为图4a所示的像素补偿电路的时序图；
图6为本公开实施例提供的驱动方法的流程图。
具体实施方式
为了使本公开的目的，技术方案和优点更加清楚，下面结合附图，对本公开实施例提供的像素补偿电路、驱动方法、有机发光显示面板及显示装置的具体实施方式进行详细地说明。应当理解，下面所描述的实施例仅用于说明和解释本公开，并不用于限定本公开。并且在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
本公开实施例提供了一种像素补偿电路，如图1a与图1b所示，包括：阈值补偿模块10、存储模块20、发光控制模块30、驱动晶体管DT1以及发光器件L；其中，
阈值补偿模块10分别与数据信号端DA、扫描信号端SC以及驱动晶体管DT1的控制极G相连，阈值补偿模块10被配置为在扫描信号端SC的控制下将数据信号端DA的电压以及阈值补偿电压提供给驱动晶体管DT1的控制极G；其中阈值补偿电压与驱动晶体管的阈值电压的差值在设定范围内；
存储模块20分别与驱动晶体管DT1的控制极G以及第一电源端VDD相连，存储模块20被配置为存储驱动晶体管DT1的控制极G的电压；
发光控制模块30分别与发光控制信号端EM、驱动晶体管DT1的第二极 m2以及发光器件L相连，驱动晶体管D的第一极m1与第一电源端VDD相连；发光控制模块30被配置为在发光控制信号端EM的控制下，导通驱动晶体管DT1的第二极m2与发光器件L，使驱动晶体管DT1驱动连接的发光器件L发光。
本公开实施例提供的上述像素补偿电路，包括：阈值补偿模块、存储模块、发光控制模块、驱动晶体管以及发光器件；其中，阈值补偿模块被配置为在数据写入阶段将数据信号端的电压以及阈值补偿电压提供给驱动晶体管的控制极；存储模块被配置为在数据写入阶段与发光阶段存储驱动晶体管的控制极的电压；发光控制模块被配置为在发光阶段导通驱动晶体管的第二极与发光器件，使驱动晶体管驱动连接的发光器件发光。因此，本公开实施例提供的上述像素补偿电路，通过上述三个模块的相互配合，可以通过简单的结构与简单的时序以及较少的信号线来实现对驱动晶体管的阈值电压的补偿，从而可以简化制备工艺、降低生产成本以及减小占用面积，有利于高分辨率的OLED显示面板的设计。
需要说明的是，在本发明实施例提供的像素电路中，设定范围是指误差允许的范围，阈值补偿电压与驱动晶体管的阈值电压的差值越小，越能对驱动晶体管的阈值电压的进行有效的补偿，因此，可选地，阈值补偿电压等于驱动晶体管的阈值电压。
可选地，在本公开实施例提供的上述像素补偿电路中，如图1a所示，驱动晶体管DT1可以为P型晶体管。该P型晶体管的栅极为驱动晶体管DT1的控制极G，该P型晶体管的源极为驱动晶体管DT1的第一极m1，该P型晶体管的漏极为驱动晶体管DT1的第二极m2。此时驱动发光器件L发光的工作电流由P型晶体管的源极流向其漏极。
或者，如图1b所示，驱动晶体管DT1可以为N型晶体管。该N型晶体管的栅极为驱动晶体管DT1的控制极G，该N型晶体管的漏极为驱动晶体管DT1的第一极m1，该N型晶体管的源极为驱动晶体管DT1的第二极m2。此时驱动发光器件L发光的工作电流由N型晶体管的漏极流向其源极。
可选地，在本公开实施例提供的上述像素补偿电路中，如图2a和图2b所示，阈值补偿模块10具体可以包括：补偿子模块11与传输子模块12；其中，
补偿子模块11分别与数据信号端DA以及传输子模块12相连，补偿子模块11被配置为将数据信号端DA的电压以及阈值补偿电压提供给传输子模块12；
传输子模块12还分别与扫描信号端SC以及驱动晶体管DT1的控制极G相连，传输子模块12被配置为在扫描信号SC的控制下，将补偿子模块11提供的电压传输给驱动晶体管DT1的控制极G。
可选地，在本公开实施例提供的上述像素补偿电路中，数据信号端DA的电压V data与驱动晶体管的阈值电压V th(DT1)满足公式：V data＞|V th(DT1)|。
下面结合具体实施例，对本申请进行详细说明。需要说明的是，本实施例中是为了更好的解释本申请，但不限制本申请。
可选地，在本公开实施例提供的上述像素补偿电路中，如图3a至图4b所示，补偿子模块11可以包括：阈值补偿晶体管DT2；其中，阈值补偿晶体管DT2的阈值电压等于阈值补偿电压；并且阈值补偿晶体管DT2的控制极与其第一极均与数据信号端DA相连，阈值补偿晶体管DT2的第二极与传输子模块12相连。
可选地，在本公开实施例提供的上述像素补偿电路中，如图3a和图3b所示，阈值补偿晶体管DT2可以为P型晶体管。该P型晶体管的栅极为阈值补偿晶体管DT2的控制极，该P型晶体管的源极为阈值补偿晶体管DT2的第一极，该P型晶体管的漏极为阈值补偿晶体管DT2的第二极。此时数据信号端DA的信号的电流由P型晶体管的源极流向其漏极。或者，如图4a与图4b所示，阈值补偿晶体管DT2可以为N型晶体管。该N型晶体管的栅极为阈值补偿晶体管DT2的控制极，该N型晶体管的源极为阈值补偿晶体管DT2的第二极，该N型晶体管的漏极为阈值补偿晶体管DT2的第一极。此时数据信号 端DA的信号的电流由P型晶体管的漏极流向其源极。
可选地，在误差允许的范围内使阈值补偿晶体管DT2与驱动晶体管DT1的晶体管特性相同，例如其阈值电压相同。在实际工艺制备时，可以将阈值补偿晶体管DT2与驱动晶体管DT1设计的布局位置较近，且设置相同的尺寸，以保证在误差允许的范围内其晶体管特性相同。并且，在实际应用中，阈值补偿晶体管DT2与驱动晶体管DT1的特性需要根据实际应用环境来设计确定，在此不作限定。
可选地，在本公开实施例提供的上述像素补偿电路中，阈值补偿晶体管DT2与驱动晶体管DT1相邻设置，且阈值补偿晶体管DT2的尺寸与驱动晶体管DT2的尺寸相同。
可选地，在本公开实施例提供的上述像素补偿电路中，由于阈值补偿晶体管的控制极与其第一极均与数据信号端相连，使其形成二极管连接方式，因此，在数据写入阶段，数据信号端有用于显示的数据电压V tada时，阈值补偿晶体管导通并向传输子模块输入信号，直至阈值补偿晶体管的第二极的电压变为：V data-|V th(DT2)|时截止；其中，V th(DT2)为阈值补偿晶体管的阈值电压。由于V th(DT2)与驱动晶体管的阈值电压V th(DT1)相等，因此阈值补偿晶体管可以将数据信号端的电压以及与驱动晶体管的阈值电压相等的电压提供给传输子模块。
可选地，在本公开实施例提供的上述像素补偿电路中，如图3a至图4b所示，传输子模块12可以包括：第一开关晶体管M1；其中，
第一开关晶体管M1的控制极与扫描信号端SC相连，第一开关晶体管M1的第一极与补偿子模块11相连，第一开关晶体管M1的第二极与驱动晶体管DT1的控制极G相连。
可选地，在本公开实施例提供的上述像素补偿电路中，如图3a与图4b所示，第一开关晶体管M1可以为P型晶体管。或者，如图3b与图4a所示，第一开关晶体管M1可以为N型晶体管，在此不作限定。
可选地，在本公开实施例提供的上述像素补偿电路中，第一开关晶体管M1在扫描信号端SC的控制下处于导通状态时，可以将其第一极的电压，即补偿子模块输出的电压提供给驱动晶体管DT1的控制极G。
可选地，在本公开实施例提供的上述像素补偿电路中，如图3a至图4b所示，发光控制模块30可以包括：第二开关晶体管M2；其中，
第二开关晶体管M2的控制极与发光控制信号端EM相连，第二开关晶体管M2的第一极与驱动晶体管DT1的第二极m2相连，第二开关晶体管M2的第二极与发光器件L的第一端相连，发光器件L的第二端与第二电源端VSS相连。
可选地，在本公开实施例提供的上述像素补偿电路中，如图3a与图4b所示，第二开关晶体管可以为P型晶体管；或者，如图3b与图4a所示，第二开关晶体管可以为N型晶体管，在此不作限定。
可选地，在本公开实施例提供的上述像素补偿电路中，第二开关晶体管M2在发光控制信号端的控制下处于导通状态时，将驱动晶体管DT1的第二极与发光器件L的第一端导通，从而将驱动晶体管DT1的第二极输出的电流提供给发光器件L，以驱动发光器件L发光。
具体地，可选地，在本公开实施例提供的上述像素补偿电路中，如图3a至图4b所示，存储模块20具体可以包括：电容C；其中，电容C的第一端与第一电源端VDD相连，电容C的第二端与驱动晶体管DT1的控制极G相连。
可选地，在本公开实施例提供的上述像素补偿电路中，电容C可以在第一电源端VDD与驱动晶体管DT1的控制极的控制下进行充电，并且由于电容C的自举作用，在驱动晶体管DT1的控制极处于浮接状态(Floating)时，可以保持其两端的电压差稳定，从而存储充入的电压。
可选地，在本公开实施例提供的上述像素补偿电路中，第一电源端VDD的电压V dd大于第二电源端VSS的电压V ss。
可选地，在本公开实施例提供的上述像素补偿电路中，发光器件L一般 为有机电致发光二极管，其在驱动晶体管DT1处于饱和状态时的电流的作用下实现发光。并且有机电致发光二极管的阳极为发光器件L的第一端，阴极为发光器件L的第二端。
以上仅是举例说明本公开实施例提供的像素补偿电路中各模块的具体结构，可选地，上述各模块的具体结构不限于本公开实施例提供的上述结构，还可以是本领域技术人员可知的其他结构，在此不作限定。
进一步地，为了简化制备工艺，可选地，在本公开实施例提供的上述像素补偿电路中，如图3a所示，驱动晶体管DT1为P型晶体管，阈值补偿晶体管DT2为P型晶体管，并且所有的开关晶体管均为P型晶体管。或者，如图4a所示，驱动晶体管DT1为N型晶体管，阈值补偿晶体管DT2为N型晶体管，并且所有的开关晶体管均为N型晶体管，在此不作限定。
可选地，在本公开实施例提供的上述像素补偿电路中，P型开关晶体管在高电位作用下截止，在低电位作用下导通；N型开关晶体管在高电位作用下导通，在低电位作用下截止。
需要说明的是，在本公开实施例提供的上述像素补偿电路中，驱动晶体管和开关晶体管可以是薄膜晶体管(TFT，Thin Film Transistor)，也可以是金属氧化物半导体场效应管(MOS，Metal Oxide Semiconductor)，在此不作限定。在具体实施时，这些开关晶体管的控制极为栅极，并且可以根据开关晶体管类型以及信号端的信号的不同将其第一极作为源极或漏极，以及将其第二极作为漏极或源极，在此不作限定。在描述具体实施例时，均是以驱动晶体管和开关晶体管为MOS管为例进行说明的。
下面以图3a和图4a所示的像素补偿电路为例，结合电路时序图对本公开实施例提供的上述像素补偿电路的工作过程作以描述。下述描述中以1表示高电位，0表示低电位。需要说明的是，1和0是逻辑电位，其仅是为了更好的解释本公开实施例提供的像素补偿电路的具体工作过程。
在其中一种具体的实施例中，如图3a所示，驱动晶体管DT1与阈值补偿晶体管DT2以及所有开关晶体管均为P型晶体管；对应的输入时序图如图5a 所示。具体地，选取如图5a所示的输入时序图中的T1和T2二个阶段。
在T1阶段，SC＝0，EM＝1。由于SC＝0，因此第一开关晶体管M1导通。由于EM＝1，因此第二开关晶体管M2截止。
由于阈值补偿晶体管DT2的栅极与其源极均与数据信号端DA相连形成二极管连接结构，阈值补偿晶体管DT2在数据信号端DA的数据电压V data的作用下导通，直至阈值补偿晶体管DT2的漏极的电压变为V data-|V th(DT2)|时截止。导通的第一开关晶体管M1将阈值补偿晶体管DT2的漏极的电压V data-|V th(DT2)|提供给驱动晶体管DT1的栅极G，从而使驱动晶体管DT1的栅极G的电压为V data-|V th(DT2)|，电容C充电，使电容C两端的电压差为V dd-V data+|V th(DT2)|。
在T2阶段，SC＝1，EM＝0。由于SC＝1，因此第一开关晶体管M1截止。由于EM＝0，因此第二开关晶体管M2导通。
导通的第二开关晶体管M2使驱动晶体管DT1的漏极D与发光器件L导通，将驱动晶体管DT1的漏极的电流提供给发光器件L。驱动晶体管DT1的漏极的电流I L为其处于饱和状态时的电流，根据饱和状态电流特性可知，电流I L满足公式：
I L＝K(V GS-|V th(DT0)|) 2＝K(V dd-V data+V th(DT2)-|V th(DT0)|)＝K(V dd-V data)；其中，
Figure PCTCN2018081624-appb-000001
μ为驱动晶体管DT1的迁移率、Cox为单位面积栅氧化层电容，
Figure PCTCN2018081624-appb-000002
为驱动晶体管的宽长比，V GS为驱动晶体管DT1的栅极与其源极之间的电压差，并且Vth(DT2)＝Vth(DT1)。因此，驱动晶体DT1驱动发光器件L发光的工作电流I L仅与数据信号端DA的电压V Data以及第一电源端VDD的电压V dd有关，而与驱动晶体管DT1的阈值电压V th(DT1)无关，可以解决由于驱动晶体管DT1的工艺制程以及长时间的操作造成的阈值电压V th(DT1)漂移对驱动发光器件L的工作电流的影响，从而使发光器件L的工作电流保持稳定，进而保证了发光器件L的正常工作。
在另一种具体的实施例中，如图4a所示，驱动晶体管DT1与阈值补偿晶体管DT2以及所有开关晶体管均为N型晶体管；对应的输入时序图如图5b所示。具体地，选取如图5a所示的输入时序图中的T1和T2二个阶段。
在T1阶段，SC＝1，EM＝0。由于SC＝1，因此第一开关晶体管M1导通。由于EM＝0，因此第二开关晶体管M2截止。
由于阈值补偿晶体管DT2的栅极与其漏极均与数据信号端DA相连形成二极管连接结构，阈值补偿晶体管DT2在数据信号端DA的数据电压V data的作用下导通，直至阈值补偿晶体管DT2的源极的电压变为V data-|V th(DT2)|时截止。导通的第一开关晶体管M1将阈值补偿晶体管DT2的源极的电压V data-|V th(DT2)|提供给驱动晶体管DT1的栅极G，从而使驱动晶体管DT1的栅极G的电压为V data-|V th(DT2)|，电容C充电，使电容C两端的电压差为V dd-V data+|V th(DT2)|。
在T2阶段，SC＝0，EM＝1。由于SC＝0，因此第一开关晶体管M1截止。由于EM＝1，因此第二开关晶体管M2导通。
导通的第二开关晶体管M2使驱动晶体管DT1的源极D与发光器件L导通，将驱动晶体管DT1的源极的电流提供给发光器件L。驱动晶体管DT1的源极的电流I L为其处于饱和状态时的电流，根据饱和状态电流特性可知，电流I L满足公式：
I L＝K(V GS-|V th(DT0)|) 2＝K(V dd-V data+V th(DT2)-|V th(DT0)|)＝K(V dd-V data)；其中，
Figure PCTCN2018081624-appb-000003
μ为驱动晶体管DT1的迁移率、Cox为单位面积栅氧化层电容，
Figure PCTCN2018081624-appb-000004
为驱动晶体管的宽长比，V GS为驱动晶体管DT1的栅极与其漏极之间的电压差，并且Vth(DT2)＝Vth(DT1)。因此，驱动晶体DT1驱动发光器件L发光的工作电流I L仅与数据信号端DA的电压V Data以及第一电源端VDD的电压V dd有关，而与驱动晶体管DT1的阈值电压V th(DT1)无关，可以解决由于驱动晶体管DT1的工艺制程以及长时间的操作造成的阈值电压V th(DT1)漂移对 驱动发光器件L的工作电流的影响，从而使发光器件L的工作电流保持稳定，进而保证了发光器件L的正常工作。
本公开实施例提供的上述像素补偿电路，通过简单的结构，即仅通过两个开关晶体管、一个电容以及阈值电压与驱动晶体管的阈值电压相同的阈值补偿晶体管，以及简单的时序即可以实现对驱动晶体管的阈值电压的补偿功能，可以简化制备工艺、降低生产成本以及减小占用面积，从而有利于高分辨率的OLED显示面板的设计。并且与现有的像素补偿电路相比，本申请的像素补偿电路不用额外设置用于为驱动晶体管的栅极进行初始化的开关晶体管以及信号端，从而可以降低对驱动IC(例如驱动扫描电路)的驱动能力要求，从而可以降低驱动IC中的晶体管的尺寸，降低驱动IC占用空间，进而可以将显示面板的边框做的更窄。并且，由于本申请中的像素补偿电路至少还可以减少用于输入初始化信号的信号线，因此可以提高显示面板的分辨率。
基于同一发明构思，本公开实施例还提供了一种本公开实施例提供的上述任一种像素补偿电路的驱动方法，如图6所示，包括：数据写入阶段与发光阶段；其中，
S601、在数据写入阶段，阈值补偿模块在扫描信号端的控制下，将数据信号端的电压以及阈值补偿电压提供给驱动晶体管的控制极；存储模块存储驱动晶体管的控制极的电压；
S602、在发光阶段，存储模块存储驱动晶体管的控制极的电压；发光控制模块在发光控制信号端的控制下，导通驱动晶体管的第二极与发光器件，使驱动晶体管驱动连接的发光器件发光。
本公开实施例提供的上述驱动方法，可以通过简单的时序即可实现对驱动晶体管的阈值电压的补偿功能。
可选地，在本公开实施例提供的上述驱动方法中，在数据写入阶段，具体包括：补偿子模块将数据信号端的电压以及阈值补偿电压提供给传输子模块；传输子模块将补偿子模块提供的电压传输给驱动晶体管的控制极。
基于同一发明构思，本公开实施例还提供了一种有机发光显示面板，包 括本公开实施例提供的上述任一种像素补偿电路。该有机发光显示面板解决问题的原理与前述像素补偿电路相似，因此该有机发光显示面板的具体实施可以参见前述像素补偿电路的实施，重复之处在此不再赘述。
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有机发光显示面板。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。对于该显示装置的其它必不可少的组成部分均为本领域的普通技术人员应该理解具有的，在此不做赘述，也不应作为对本公开的限制。该显示装置的实施可以参见上述像素补偿电路的实施例，重复之处不再赘述。
本公开实施例提供的像素补偿电路、驱动方法、有机发光显示面板及显示装置，包括：阈值补偿模块、存储模块、发光控制模块、驱动晶体管以及发光器件；其中，阈值补偿模块被配置为在数据写入阶段将数据信号端的电压以及阈值补偿电压提供给驱动晶体管的控制极；存储模块被配置为在数据写入阶段与发光阶段存储驱动晶体管的控制极的电压；发光控制模块被配置为在发光阶段导通驱动晶体管的第二极与发光器件，使驱动晶体管驱动连接的发光器件发光。因此，本公开实施例提供的上述像素补偿电路，通过上述三个模块的相互配合，可以通过简单的结构与简单的时序以及较少的信号线来实现对驱动晶体管的阈值电压的补偿，从而可以简化制备工艺、降低生产成本以及减小占用面积，有利于高分辨率的OLED显示面板的设计。
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 (13)

  1. 一种像素补偿电路，其中，包括：阈值补偿模块、存储模块、发光控制模块、驱动晶体管以及发光器件；其中，
    所述阈值补偿模块分别与数据信号端、扫描信号端以及所述驱动晶体管的控制极相连，所述阈值补偿模块被配置为在所述扫描信号端的控制下，将所述数据信号端的电压以及阈值补偿电压提供给所述驱动晶体管的控制极；其中所述阈值补偿电压与所述驱动晶体管的阈值电压的差值在设定范围内；
    所述存储模块分别与所述驱动晶体管的控制极以及第一电源端相连，所述存储模块被配置为存储所述驱动晶体管的控制极的电压；
    所述发光控制模块分别与发光控制信号端、所述驱动晶体管的第二极以及所述发光器件相连，所述驱动晶体管的第一极与所述第一电源端相连；所述发光控制模块被配置为在所述发光控制信号端的控制下，导通所述驱动晶体管的第二极与所述发光器件，以使所述驱动晶体管驱动所述发光器件发光。
  2. 如权利要求1所述的像素补偿电路，其中，所述阈值补偿电压等于所述驱动晶体管的阈值电压。
  3. 如权利要求1所述的像素补偿电路，其中，所述阈值补偿模块包括：补偿子模块与传输子模块；其中，
    所述补偿子模块分别与所述数据信号端以及所述传输子模块相连，所述补偿子模块被配置为将所述数据信号端的电压以及所述阈值补偿电压提供给所述传输子模块；
    所述传输子模块还分别与所述扫描信号端以及所述驱动晶体管的控制极相连，所述传输子模块被配置为在所述扫描信号端的控制下，将所述补偿子模块提供的电压传输给所述驱动晶体管的控制极。
  4. 如权利要求3所述的像素补偿电路，其中，所述补偿子模块包括：阈值补偿晶体管；其中，所述阈值补偿晶体管的阈值电压等于所述阈值补偿电压；并且所述阈值补偿晶体管的控制极与其第一极均与所述数据信号端相连， 所述阈值补偿晶体管的第二极与所述传输子模块相连。
  5. 如权利要求4所述的像素补偿电路，其中，所述阈值补偿晶体管与所述驱动晶体管均为P型晶体管或N型晶体管。
  6. 如权利要求4所述的像素补偿电路，其中，所述阈值补偿晶体管与所述驱动晶体管相邻设置。
  7. 如权利要求4所述的像素补偿电路，其中，所述阈值补偿晶体管的尺寸与所述驱动晶体管的尺寸相同。
  8. 如权利要求3所述的像素补偿电路，其中，所述传输子模块包括：第一开关晶体管；其中，
    所述第一开关晶体管的控制极与所述扫描信号端相连，所述第一开关晶体管的第一极与所述补偿子模块相连，所述第一开关晶体管的第二极与所述驱动晶体管的控制极相连。
  9. 如权利要求1所述的像素补偿电路，其中，存储模块包括：电容；其中，
    所述电容的第一端与所述第一电源端相连，所述电容的第二端与所述驱动晶体管的控制极相连。
  10. 如权利要求1所述的像素补偿电路，其中，所述发光控制模块包括：第二开关晶体管；其中，
    所述第二开关晶体管的控制极与所述发光控制信号端相连，所述第二开关晶体管的第一极与所述驱动晶体管的第二极相连，所述第二开关晶体管的第二极与所述发光器件的第一端相连，所述发光器件的第二端与第二电源端相连。
  11. 一种有机发光显示面板，其中，包括如权利要求1-10任一项所述的像素补偿电路。
  12. 一种显示装置，其中，包括如权利要求11所述的有机发光显示面板。
  13. 一种如权利要求1-10任一项所述的像素补偿电路的驱动方法，其中，包括：数据写入阶段与发光阶段；其中，
    在所述数据写入阶段，所述阈值补偿模块在所述扫描信号端的控制下，将所述数据信号端的电压以及所述阈值补偿电压提供给所述驱动晶体管的控制极；所述存储模块存储所述驱动晶体管的控制极的电压；
    在所述发光阶段，所述存储模块存储所述驱动晶体管的控制极的电压；所述发光控制模块在所述发光控制信号端的控制下，导通所述驱动晶体管的第二极与所述发光器件，使所述驱动晶体管驱动所述发光器件发光。
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