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WO2018157613A1 - 一种oled像素电路及其驱动方法、显示装置 - Google Patents

一种oled像素电路及其驱动方法、显示装置 Download PDF

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Publication number
WO2018157613A1
WO2018157613A1 PCT/CN2017/107624 CN2017107624W WO2018157613A1 WO 2018157613 A1 WO2018157613 A1 WO 2018157613A1 CN 2017107624 W CN2017107624 W CN 2017107624W WO 2018157613 A1 WO2018157613 A1 WO 2018157613A1
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Prior art keywords
circuit
sub
transistor
voltage
signal
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PCT/CN2017/107624
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English (en)
French (fr)
Inventor
喻勇
兰传艳
刘静
张光均
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to US15/781,445 priority Critical patent/US10923039B2/en
Publication of WO2018157613A1 publication Critical patent/WO2018157613A1/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]
    • G09G3/3275—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
    • 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]
    • 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
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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
    • G09G2300/0819—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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0278—Details of driving circuits arranged to drive both scan and data 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/026—Arrangements or methods related to booting a display

Definitions

  • Embodiments of the present invention relate to an OLED pixel circuit, a driving method thereof, and a display device.
  • OLED Organic Light Emitting Diode
  • LCD liquid crystal display
  • OLED has low energy consumption, low production cost, self-luminous, wide viewing angle. And the speed of response is fast.
  • the pixel circuit design is the core technical content of OLED display, which has important research significance.
  • the display area of the display panel includes a plurality of OLED pixel circuits.
  • the driving circuit of each OLED pixel circuit is not uniform due to the unstable circuit of each OLED pixel circuit, thereby causing driving.
  • the current flowing through the transistor to the light emitting device is not uniform, resulting in problems such as a boot screen, a sleep wake-up screen, and the like.
  • Embodiments of the present invention provide an OLED pixel circuit, a driving method thereof, and a display device, which can eliminate the phenomenon that the display panel is turned on, the sleep wakes up, and the like.
  • An embodiment of the present invention provides an OLED pixel circuit, including: an initialization sub-circuit, a data writing and compensating sub-circuit, an emission control sub-circuit, a driving sub-circuit, and an illuminating sub-circuit; the initializing sub-circuits are respectively connected to the a driving sub-circuit, a first signal end, a first voltage terminal, and an initial voltage terminal, for the first signal end,
  • the driving sub-circuit is initialized under the control of the initial voltage end and the first voltage end;
  • the data writing and compensating sub-circuit is respectively connected to the driving sub-circuit, the scanning signal end, and the data voltage End, for controlling the threshold voltage of the driving sub-circuit by the signal input from the data voltage terminal under the control of the scanning signal end;
  • the driving sub-circuit is further connected to the lighting control sub-circuit and
  • the first voltage end is configured to drive the illuminating sub-circuit to emit light under the control of the first voltage end and the illuminating control
  • the driving subcircuit includes a storage capacitor and a driving transistor; a first end of the storage capacitor is coupled to the initialization sub-circuit, the data writing and compensating sub-circuit, and the illumination control sub-circuit a second end connected to the gate of the driving transistor; a first pole of the driving transistor is connected to the first voltage end, a second pole is connected to the light emitting control sub-circuit, and the data writing and compensating sub-circuit .
  • the initialization sub-circuit includes a first transistor and a second transistor; a gate of the first transistor is connected to the first signal end, and a first pole is connected to the first voltage terminal, and the second pole Connecting a first end of the storage capacitor; a gate of the second transistor is connected to the first signal end, a first pole is connected to the initial voltage end, and a second pole is connected to a second end of the storage capacitor.
  • the data writing and compensating sub-circuit includes a third transistor and a fourth transistor; a gate of the third transistor is connected to the scan signal end, and a first pole is connected to the data voltage end, a diode connected to the first end of the storage capacitor; a gate of the fourth transistor is connected to the scan signal end, a first pole is connected to the second pole of the driving transistor, and a second pole is connected to the storage capacitor Two ends.
  • the illumination control subcircuit includes a fifth transistor, a sixth transistor, and a seventh transistor; a gate of the fifth transistor is coupled to the enable signal terminal, and a first pole is coupled to the second voltage a second pole connected to the first end of the storage capacitor; a gate of the sixth transistor connected to the enable signal end, a first pole connected to the second pole of the driving transistor, and a second pole connected to the a illuminating sub-circuit; a gate of the seventh transistor is connected to the second signal end, and a first pole is connected to the third voltage end, the second pole The illuminating sub-circuit is connected.
  • the illuminating sub-circuit includes a light emitting device; an anode of the light emitting device is coupled to a second electrode of the sixth transistor, and a cathode is coupled to a second electrode of the seventh transistor.
  • Embodiments of the present invention provide a display device including the OLED pixel circuit described above.
  • Embodiments of the present invention provide a driving method of an OLED pixel circuit, the driving method comprising: in an initialization phase of a frame, the initialization sub-circuit is controlled by the first signal end, the first voltage end, and the initial voltage end, The driving sub-circuit is initialized; in the data writing and compensating stage of one frame, the data writing and compensating sub-circuit compensates the threshold voltage of the driving sub-circuit by the signal input from the data voltage terminal under the control of the scanning signal end In the first frame to the Nth frame, in the illumination phase of each frame, the illumination control sub-circuit controls the illumination sub-circuit under the control of the enable signal terminal, the second voltage terminal, the second signal terminal, and the third voltage terminal.
  • the light emission control subcircuit is at the enable signal end, the second voltage end, the second signal end, and the third voltage end Under control, the illuminating sub-circuit is controlled to be turned on; wherein N is an integer and 1 ⁇ N ⁇ 5.
  • N is equal to two.
  • the initialization sub-circuit includes a first transistor and a second transistor; in an initialization phase of a frame, the first signal terminal inputs an initialization signal, and controls the first transistor and the second transistor to be turned on, The driver subcircuit is initialized.
  • the data writing and compensating sub-circuit includes a third transistor and a fourth transistor; in a data writing and compensating phase of one frame, the scanning signal terminal inputs a scanning signal, and controls the third transistor and the third The four transistors are turned on to compensate the threshold voltage of the driving sub-circuit.
  • the illumination control sub-circuit includes a fifth transistor, a sixth transistor, and a seventh transistor; in the first frame to the Nth frame, the illumination phase of each frame, the enable signal input enable signal Controlling the fifth transistor and the sixth transistor to be turned on, the second signal terminal inputting the first signal to control the seventh transistor to be turned off, and controlling the light emitting sub-circuit to be turned off; in the light emitting phase of each frame after the Nth frame, the enabling signal terminal Input enable signal, controlling the fifth transistor and the sixth transistor to be turned on, and the second signal inputting the second signal
  • the seventh transistor is controlled to be turned on, and the light emitting sub-circuit is controlled to be turned on.
  • Embodiments of the present invention provide an OLED pixel circuit, a driving method thereof, and a display device, which use an illumination control sub-circuit to control the turning on or off of an illuminating sub-circuit.
  • the illumination control sub-circuit controls the illumination sub-circuit to be turned off.
  • the illumination control sub-circuit controls the illumination sub-circuit to be turned on.
  • the driving degrees of the plurality of driving transistors in the OLED pixel circuit are relatively uniform, so that the current flowing through the driving transistor to the illuminating device is relatively large. Uniform, which can avoid the splash screen on the display panel.
  • FIG. 1 is a schematic structural diagram of an OLED pixel circuit according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing a specific structure of each sub-circuit of the OLED pixel circuit shown in FIG. 1;
  • FIG. 3 is a timing diagram of respective signals used when driving the OLED pixel circuit shown in FIG. 2;
  • 4-7 are equivalent circuit diagrams of the OLED pixel circuit shown in FIG. 2 corresponding to different situations;
  • FIG. 8 is a schematic flowchart diagram of an OLED pixel circuit driving method according to an embodiment of the present invention.
  • 10-Initialization sub-circuit 20-data write and compensation sub-circuit; 30-light-emitting control sub-circuit; 40-drive sub-circuit; 50-light-emitting sub-circuit.
  • An embodiment of the present invention provides an OLED pixel circuit, as shown in FIG. 1, comprising: an initialization sub-circuit 10, a data writing and compensating sub-circuit 20, an illumination control sub-circuit 30, a driving sub-circuit 40, and a illuminating sub-circuit 50.
  • the initialization sub-circuit 10 is respectively connected to the driving sub-circuit 40, the first signal terminal S1, the first voltage terminal V1, and the initial voltage terminal Vinit for the first signal terminal S1, the initial voltage terminal Vinit, and the first The drive sub-circuit 40 is initialized under the control of the voltage terminal V1.
  • the data writing and compensating sub-circuit 20 is respectively connected to the driving sub-circuit 40, the scanning signal terminal S3, and the data voltage terminal Vdata for controlling the signal input through the data voltage terminal Vdata under the control of the scanning signal terminal S3.
  • Circuit 40 performs compensation of the threshold voltage.
  • the driving sub-circuit 40 is further connected to the light-emitting control sub-circuit 30 and the first voltage terminal V1 for driving the light-emitting sub-circuit 50 under the control of the first voltage terminal V1 and the light-emitting control sub-circuit 30 after obtaining the compensation of the threshold voltage. Glow light.
  • the illumination control sub-circuit 30 is further connected to the illuminating sub-circuit 50, the enable signal terminal EM, the second voltage terminal V2, the second signal terminal S2, and the third voltage terminal V3 for enabling the signal terminal EM and the second voltage. Under the control of the terminal V2, the second signal terminal S2, and the third voltage terminal V3, the illuminating sub-circuit 50 is turned on or off.
  • the embodiment of the invention provides an OLED pixel circuit, which uses the illumination control sub-circuit 30 to control the opening or closing of the illuminating sub-circuit 50.
  • the circuit in the OLED pixel circuit is unstable, and the illuminating controller is The circuit 30 controls the illuminating sub-circuit 50 to be turned off. After a few frames, when the circuit in the OLED pixel circuit is stabilized, the illuminating control sub-circuit 30 controls the illuminating sub-circuit 50 to be turned on.
  • the circuit in the OLED pixel circuit is relatively stable, and at this time, the driving degrees of the plurality of driving transistors in the OLED pixel circuit are relatively uniform, so that the driven crystal
  • the current flowing to the light-emitting device of the body tube is relatively uniform, so that the splash screen phenomenon of the display panel can be well avoided.
  • the driving sub-circuit 40 includes a storage capacitor Cst and a driving transistor Td.
  • the first end of the storage capacitor Cst is connected to the initialization sub-circuit 10, the data write and compensation sub-circuit 20, and the illumination control sub-circuit 30, and the second end is connected to the gate of the drive transistor Td.
  • the first electrode of the driving transistor Td is connected to the first voltage terminal V1
  • the second electrode is connected to the light-emitting control sub-circuit 30, and the data writing and compensating sub-circuit 20.
  • the driving sub-circuit 40 may further include a plurality of driving transistors Td connected in parallel.
  • the above is only an example of the driving sub-circuit 40.
  • Other structures having the same function as the driving sub-circuit 40 will not be further described herein, but all should fall within the scope of the present invention.
  • the initialization sub-circuit 10 includes a first transistor T1 and a second transistor T2.
  • the gate of the first transistor T1 is connected to the first signal terminal S1, the first electrode is connected to the first voltage terminal V1, and the second electrode is connected to the first terminal of the storage capacitor Cst.
  • the gate of the second transistor T2 is connected to the first signal terminal S1, the first electrode is connected to the initial voltage terminal Vinit, and the second electrode is connected to the second terminal of the storage capacitor Cst.
  • the initialization sub-circuit 10 may further include a plurality of switching transistors connected in parallel with the first transistor T1 and/or a plurality of switching transistors connected in parallel with the second transistor T2.
  • the foregoing is merely an illustration of the initialization sub-circuit 10.
  • Other structures having the same functions as those of the initialization sub-circuit 10 will not be further described herein, but all should fall within the scope of the present invention.
  • the data write and compensation sub-circuit 20 includes a third transistor T3 and a fourth transistor T4.
  • the gate of the third transistor T3 is connected to the scan signal terminal S3, the first pole is connected to the data voltage terminal Vdata, and the second pole is connected to the first end of the storage capacitor Cst.
  • the gate of the fourth transistor T4 is connected to the scan signal terminal S3, the first pole is connected to the second pole of the driving transistor Td, and the second pole is connected to the second end of the storage capacitor Cst.
  • the data writing and compensating sub-circuit 20 may further include a plurality of switching transistors connected in parallel with the third transistor T3, and/or a plurality of switching transistors connected in parallel with the fourth transistor T4.
  • the foregoing is merely an example of the data writing and compensating sub-circuit 20.
  • the other structures having the same functions as those of the data writing and compensating sub-circuit 20 are not described herein again, but all should fall within the scope of the present invention.
  • the light emission control sub-circuit 30 includes a fifth transistor T5, a sixth transistor T6, and a seventh transistor T7.
  • the gate of the fifth transistor T5 is connected to the enable signal terminal EM, the first pole is connected to the second voltage terminal V2, and the second pole is connected to the first end of the storage capacitor Cst.
  • the gate of the sixth transistor T6 is connected to the enable signal terminal EM, the first electrode is connected to the second electrode of the driving transistor Td, and the second electrode is connected to the light-emitting sub-circuit 50.
  • the gate of the seventh transistor T7 is connected to the second signal terminal S2, the first electrode is connected to the third voltage terminal V3, and the second electrode is connected to the light-emitting sub-circuit 50.
  • the illumination control sub-circuit 30 may further include a plurality of switching transistors connected in parallel with the fifth transistor T5, and/or a plurality of switching transistors connected in parallel with the sixth transistor T6, and/or with the seventh transistor T7. Multiple switching transistors in parallel.
  • the foregoing is merely an illustration of the illumination control sub-circuit 30.
  • Other structures having the same functions as those of the illumination control sub-circuit 30 are not described herein again, but are all within the scope of the present invention.
  • the illuminating sub-circuit 50 includes a light emitting device L having an anode connected to a second pole of a sixth transistor T6 and a cathode connected to a second pole of a seventh transistor T7.
  • the types of the transistors in the sub-circuits and the cells are not limited, that is, the driving transistor Td, the first transistor T1, the second transistor T2, the third transistor T3, and the fourth The transistor T4, the fifth transistor T5, the sixth transistor T6, and the seventh transistor T7 may be N-type transistors or P-type transistors.
  • the following embodiments of the present invention are described by taking the above transistors as P-type transistors as an example.
  • the first pole of the transistor may be a drain, and the second pole may be a source; or the first pole may be a source, and the second pole may be a drain.
  • the transistors in the above pixel circuit can be classified into an enhancement transistor and a depletion transistor depending on the manner in which the transistors are electrically conductive.
  • the embodiment of the invention does not limit this.
  • the first voltage terminal V1 is input to the high level
  • the third voltage terminal V2 is input to the low level
  • the second voltage terminal V2 is grounded as an example
  • the high here is Low refers only to the relative magnitude relationship between the input voltages.
  • each frame display process of the OLED pixel circuit can be divided into an initialization phase P1, a data writing and compensation phase P2, and an illumination phase P3.
  • the thick solid line indicates the waveform diagram of the second signal terminal S2 of each frame in the 1-N frame
  • the thin solid line indicates each subsequent to the Nth frame.
  • the first signal terminal S1 inputs a low level turn-on signal
  • the second signal terminal S2 the enable signal terminal EM
  • the scan signal terminal S3 input a high-level cutoff signal.
  • the OLED pixel circuit shown in FIG. The equivalent circuit diagram is as shown in FIG. 4.
  • the first transistor T1 and the second transistor T2 are turned on, and the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the driving transistor Td are turned on. Both are cut off (the transistor in the off state is indicated by "x").
  • the first transistor T1 is turned on, the voltage of the initial voltage terminal Vini is written to the second end of the storage capacitor Cst; the second transistor T2 is turned on, and the voltage of the first voltage terminal V1 is written to the first end of the storage capacitor Cst. , initialize the voltage across the storage capacitor Cst.
  • the voltage of the initial voltage terminal Vini should be higher than the turn-on voltage of the driving transistor Td, and after the voltage of the initial voltage terminal Vini is written to the second terminal of the storage capacitor Cst, the driving transistor Td should remain in an off state.
  • the scanning signal terminal S3 inputs a low-level turn-on signal
  • the first signal terminal S1, the second signal terminal S2, and the enable signal terminal EM input a high-level cutoff signal.
  • the OLED shown in FIG. 5 An equivalent circuit diagram of the pixel circuit is as shown in FIG. 5.
  • the third transistor T3, the fourth transistor T4, and the driving transistor Td are both turned on, and the first transistor T1, the second transistor T2, the fifth transistor T5, the sixth transistor T6, and the seventh Transistor T7 is turned off.
  • the third transistor T3 is turned on, and the voltage of the data voltage terminal Vdata is written to the memory.
  • the voltage of the second terminal of the storage capacitor Cst controls the driving transistor Td to be turned on.
  • the illumination phase P3 the illumination phase of the first frame to the Nth frame (N is a positive integer greater than or equal to 1)
  • the enable signal terminal EM inputs a low-level on signal
  • the scanning signal terminal S3 inputs a high-level cutoff signal.
  • the equivalent circuit diagram of the OLED pixel circuit shown in FIG. 2 is as shown in FIG. 6, and the fifth transistor T5, the sixth transistor T6, and the driving transistor Td are both turned on, first.
  • the transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, and the seventh transistor T7 are all turned off.
  • the driving transistor Td and the sixth transistor T6 When both the driving transistor Td and the sixth transistor T6 are turned on, the voltage of the first voltage terminal V1 is written to the anode of the light emitting device L via the driving transistor Td and the sixth transistor T6. However, since the seventh transistor T7 is turned off, the voltage of the third voltage terminal V3 cannot be written to the cathode of the light-emitting device L, and at this time, the light-emitting device L remains turned off.
  • the enable signal terminal EM and the second signal terminal S2 input a low-level turn-on signal
  • the first signal terminal S1 and the scan signal terminal S3 input a high-level cutoff signal.
  • the equivalent circuit diagram of the OLED pixel circuit shown in FIG. 2 is as shown in FIG. 7, and the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the driving transistor Td are both turned on, and the first transistor T1 and the second transistor are turned on.
  • T2 the third transistor T3 and the fourth transistor T4 are both turned off.
  • the fifth transistor T5 is turned on, and the voltage of the second voltage terminal V2 is written to the memory.
  • the driving transistor Td and the sixth transistor T6 When both the driving transistor Td and the sixth transistor T6 are turned on, the voltage of the first voltage terminal V1 is written to the anode of the light emitting device L via the driving transistor Td and the sixth transistor T6.
  • the seventh transistor T7 is turned on, and the voltage of the third voltage terminal V3 is written to the cathode of the light-emitting device L, and at this time, the light-emitting device L is turned on for screen display.
  • the driving transistor Td In the light-emitting phase P3, after the driving transistor Td is turned on, when the gate-source voltage Vgs of the driving transistor Td minus the threshold voltage Vth of the driving transistor Td is less than or equal to the drain-source voltage Vds of the driving transistor Td, that is, Vgs- When Vth ⁇ Vds, the driving transistor Td can be in a saturated on state, and at this time, the driving current I flowing through the driving transistor Td is:
  • K W/L ⁇ C ⁇ u
  • W/L is the aspect ratio of the driving transistor Td
  • C is the channel insulating layer capacitance
  • u is the channel carrier mobility
  • the above parameters are only related to the structure of the driving transistor Td. Therefore, the current flowing through the driving transistor Td is only related to the data voltage outputted by the data voltage terminal Vdata for realizing display and the voltage outputted by the second voltage terminal V2, and the driving transistor Td.
  • the threshold voltage Vth is independent, thereby eliminating the influence of the threshold voltage Vth of the driving transistor Td on the luminance of the light-emitting device L, and improving the uniformity of the luminance of the light-emitting device L.
  • the embodiment of the invention further provides a display device comprising the above OLED pixel circuit.
  • Embodiments of the present invention provide a display device including any of the pixel driving circuits described above.
  • the display device may include a plurality of pixel cell arrays, each of which includes any one of the pixel driving circuits as described above.
  • the display device provided by the embodiment of the present invention has the same advantageous effects as the pixel driving circuit provided by the foregoing embodiments of the present invention. Since the pixel driving circuit has been described in detail in the foregoing embodiments, I will not repeat them here.
  • An embodiment of the present invention further provides a driving method of an OLED pixel circuit. As shown in FIG. 8, the driving method includes:
  • the initialization sub-circuit 10 initializes the driving sub-circuit 40 under the control of the first signal terminal S1, the first voltage terminal V1, and the initial voltage terminal Vinit.
  • the data writing and compensating sub-circuit 20 compensates the threshold voltage of the driving sub-circuit 40 by the signal input from the data voltage terminal Vdata under the control of the scanning signal terminal S3. .
  • the illumination control sub-circuit 30 in the first frame to the Nth frame, the illumination phase P4 of each frame, the illumination control sub-circuit 30 is at the enable signal terminal EM, the second voltage terminal V2, the second signal terminal S2, and the third voltage terminal V3. Under the control, the control illuminator circuit 50 is turned off.
  • the light emission control sub-circuit 30 is controlled under the control of the enable signal terminal EM, the second voltage terminal V2, the second signal terminal S2, and the third voltage terminal V3.
  • the illuminating sub-circuit 50 is turned on.
  • N is an integer and 1 ⁇ N ⁇ 5.
  • the embodiment of the present invention provides a driving method of an OLED pixel circuit, which uses an illumination control sub-circuit 30 to control the turning on or off of the illuminating sub-circuit 50.
  • the circuit in the OLED pixel circuit is unstable.
  • the illumination control sub-circuit 30 controls the illumination sub-circuit 50 to be turned off.
  • the illumination control sub-circuit 30 controls the illumination sub-circuit 50 to be turned on.
  • the driving degrees of the plurality of driving transistors in the OLED pixel circuit are relatively uniform, so that the current flowing through the driving transistor to the illuminating device is small. It is relatively uniform, which can avoid the splash screen of the display panel.
  • the initialization sub-circuit 10 includes a first transistor T1 and a second transistor T2.
  • the first signal terminal S1 inputs an initialization signal, and controls The first transistor T1 and the second transistor T2 are turned on to initialize the driving sub-circuit 40.
  • the data write and compensation sub-circuit 20 includes a third transistor T3 and a fourth transistor T4.
  • the scanning signal terminal S3 inputs a scanning signal, controls the third transistor T3 and the fourth transistor T4 to be turned on, and compensates the driving sub-circuit 40 for the threshold voltage.
  • the illumination control subcircuit 30 includes a fifth transistor T5, a sixth transistor T6, and a seventh transistor T7.
  • the enable signal terminal EM inputs an enable signal, controls the fifth transistor T5 and the sixth transistor T6 to be turned on, and the second signal terminal S2 inputs the first signal control.
  • the seventh transistor T7 is turned off, and the control sub-circuit 50 is turned off.
  • the enable signal terminal EM inputs an enable signal, controls the fifth transistor T5 and the sixth transistor T6 to be turned on, and the second signal terminal S2 inputs the second signal to control the seventh transistor T7. Turning on, the control illuminator circuit 50 is turned on.

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Abstract

一种OLED像素电路及其驱动方法、显示装置。OLED像素电路包括：初始化子电路（10），分别连接驱动子电路（40）、第一信号端（S1）、第一电压端（V1）、以及初始电压端（Vinit），用于对驱动子电路（40）进行初始化；数据写入与补偿子电路（20），分别连接驱动子电路（40）、扫描信号端（S3）、以及数据电压端（Vdata），用于对驱动子电路（40）进行阈值电压的补偿；驱动子电路（40），还连接发光控制子电路（30）以及第一电压端（V1），用于在得到阈值电压的补偿后，驱动发光子电路（50）进行发光；发光控制子电路（30），还连接发光子电路（50）、使能信号端（EM）、第二电压端（V2）、第二信号端（S2）、以及第三电压端（V3），用于在使能信号端（EM）、第二电压端（V2）、第二信号端（S2）、以及第三电压端（V3）的控制下，使发光子电路（50）开启或关闭。

Description

一种OLED像素电路及其驱动方法、显示装置
本公开要求于2017年3月3日递交的中国专利申请第201710124211.X号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本发明的实施例涉及一种OLED像素电路及其驱动方法、显示装置。
背景技术
有机电致发光二极管(Organic Light Emitting Diode，OLED)显示器是目前研究领域的热点之一，与液晶显示器(Liquid Crystal Display，LCD)相比，OLED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。其中，像素电路设计是OLED显示器的核心技术内容，具有重要的研究意义。
显示面板的显示区包括多个OLED像素电路，在第一帧画面显示时，由于每个OLED像素电路的电路不稳定，导致每个OLED像素电路中驱动晶体管的开启程度不均一，从而导致经驱动晶体管流向发光器件的电流的大小也不均一，从而导致显示面板出现开机闪屏、睡眠唤醒闪屏等问题。
发明内容
本发明的实施例提供一种OLED像素电路及其驱动方法、显示装置，可消除显示面板开机闪屏、睡眠唤醒闪屏等现象。
本发明的实施例提供一种OLED像素电路，包括：初始化子电路、数据写入与补偿子电路、发光控制子电路、驱动子电路、以及发光子电路；所述初始化子电路，分别连接所述驱动子电路、第一信号端、第一电压端、以及初始电压端，用于在所述第一信号端、 所述初始电压端、以及所述第一电压端的控制下，对所述驱动子电路进行初始化；所述数据写入与补偿子电路，分别连接所述驱动子电路、扫描信号端、以及数据电压端，用于在所述扫描信号端的控制下，通过所述数据电压端输入的信号，对所述驱动子电路进行阈值电压的补偿；所述驱动子电路，还连接所述发光控制子电路以及所述第一电压端，用于在得到阈值电压的补偿后，在所述第一电压端以及所述发光控制子电路的控制下，驱动所述发光子电路进行发光；所述发光控制子电路，还连接所述发光子电路、使能信号端、第二电压端、第二信号端、以及第三电压端，用于在使能信号端、第二电压端、第二信号端、以及第三电压端的控制下，使所述发光子电路开启或关闭。
在一个实施例中，所述驱动子电路包括存储电容和驱动晶体管；所述存储电容的第一端连接所述初始化子电路、所述数据写入与补偿子电路、以及所述发光控制子电路，第二端连接所述驱动晶体管的栅极；所述驱动晶体管的第一极连接所述第一电压端，第二极连接所述发光控制子电路、以及所述数据写入与补偿子电路。
在一个实施例中，所述初始化子电路包括第一晶体管和第二晶体管；所述第一晶体管的栅极连接所述第一信号端，第一极连接所述第一电压端，第二极连接所述存储电容的第一端；所述第二晶体管的栅极连接所述第一信号端，第一极连接所述初始电压端，第二极连接所述存储电容的第二端。
在一个实施例中，所述数据写入与补偿子电路包括第三晶体管和第四晶体管；所述第三晶体管的栅极连接所述扫描信号端，第一极连接所述数据电压端，第二极连接所述存储电容的第一端；所述第四晶体管的栅极连接所述扫描信号端，第一极连接所述驱动晶体管的第二极，第二极连接所述存储电容的第二端。
在一个实施例中，所述发光控制子电路包括第五晶体管、第六晶体管和第七晶体管；所述第五晶体管的栅极连接所述使能信号端，第一极连接所述第二电压端，第二极连接所述存储电容的第一端；所述第六晶体管的栅极连接所述使能信号端，第一极连接所述驱动晶体管的第二极，第二极连接所述发光子电路；所述第七晶体管的栅极连接所述第二信号端，第一极连接所述第第三电压端，第二极 连接所述发光子电路。
在一个实施例中，所述发光子电路包括发光器件；所述发光器件的阳极连接所述第六晶体管的第二极，阴极连接所述第七晶体管的第二极。
本发明的实施例提供一种显示装置，包括上面所述的OLED像素电路。
本发明的实施例提供一种OLED像素电路的驱动方法，所述驱动方法包括：在一帧的初始化阶段，初始化子电路在第一信号端、第一电压端、以及初始电压端的控制下，对驱动子电路进行初始化；在一帧的数据写入与补偿阶段，数据写入与补偿子电路在扫描信号端的控制下，通过数据电压端输入的信号，对所述驱动子电路进行阈值电压的补偿；在第一帧到第N帧中，每一帧的发光阶段，发光控制子电路在使能信号端、第二电压端、第二信号端、以及第三电压端的控制下，控制发光子电路关闭；在第N帧以后的每一帧的发光阶段，所述发光控制子电路在所述使能信号端、所述第二电压端、所述第二信号端、以及所述第三电压端的控制下，控制所述发光子电路开启；其中，N为整数，且1≤N≤5。
在一个实施例中，N等于2。
在一个实施例中，所述初始化子电路包括第一晶体管和第二晶体管；在一帧的初始化阶段，所述第一信号端输入初始化信号，控制第一晶体管和第二晶体管打开，对所述驱动子电路进行初始化。
在一个实施例中，所述数据写入与补偿子电路包括第三晶体管和第四晶体管；在一帧的数据写入与补偿阶段，所述扫描信号端输入扫描信号，控制第三晶体管和第四晶体管打开，对所述驱动子电路进行阈值电压的补偿。
在一个实施例中，所述发光控制子电路包括第五晶体管、第六晶体管和第七晶体管；在第一帧到第N帧中，每一帧的发光阶段，使能信号端输入使能信号，控制第五晶体管和第六晶体管打开，第二信号端输入第一信号控制第七晶体管截止，控制所述发光子电路关闭；在第N帧以后的每一帧的发光阶段，使能信号端输入使能信号，控制第五晶体管和第六晶体管打开，第二信号端输入第二信号 控制第七晶体管打开，控制所述发光子电路开启。
本发明实施例提供一种OLED像素电路及其驱动方法、显示装置，采用发光控制子电路对发光子电路的开启或关闭进行控制，具体的，在显示刚开始时，OLED像素电路中的电路不稳定，发光控制子电路控制发光子电路关闭，几帧过后，当OLED像素电路中的电路稳定后，发光控制子电路控制发光子电路开启。这样一来，当发光子电路开启时，OLED像素电路中的电路已经较为稳定，此时OLED像素电路内的多个驱动晶体管的开启程度较为均一，使得经驱动晶体管流向发光器件的电流的大小较为均一，从而可很好的避免显示面板出现闪屏现象。
附图说明
为了更清楚地说明本发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地介绍，显而易见地，
下面描述中的附图仅仅是本发明的一些实施例，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为本发明实施例提供的一种OLED像素电路的结构示意图；
图2为图1所示OLED像素电路的各个子电路的一种具体结构示意图；
图3为用于驱动图2所示的OLED像素电路时采用的各个信号的时序图；
图4-7为图2所示的OLED像素电路对应不同情况时的等效电路图；
图8为本发明实施例提供的一种OLED像素电路驱动方法流程示意图。
附图标记
10-初始化子电路；20-数据写入与补偿子电路；30-发光控制子电路；40-驱动子电路；50-发光子电路。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供一种OLED像素电路，如图1所示，包括：初始化子电路10、数据写入与补偿子电路20、发光控制子电路30、驱动子电路40、以及发光子电路50。
具体的，初始化子电路10，分别连接驱动子电路40、第一信号端S1、第一电压端V1、以及初始电压端Vinit，用于在第一信号端S1、初始电压端Vinit、以及第一电压端V1的控制下，对驱动子电路40进行初始化。
数据写入与补偿子电路20，分别连接驱动子电路40、扫描信号端S3、以及数据电压端Vdata，用于在扫描信号端S3的控制下，通过数据电压端Vdata输入的信号，对驱动子电路40进行阈值电压的补偿。
驱动子电路40，还连接发光控制子电路30以及第一电压端V1，用于在得到阈值电压的补偿后，在第一电压端V1以及发光控制子电路30的控制下，驱动发光子电路50进行发光。
发光控制子电路30，还连接发光子电路50、使能信号端EM、第二电压端V2、第二信号端S2、以及第三电压端V3，用于在使能信号端EM、第二电压端V2、第二信号端S2、以及第三电压端V3控制下，使发光子电路50开启或关闭。
本发明实施例提供一种OLED像素电路，采用发光控制子电路30对发光子电路50的开启或关闭进行控制，具体的，在显示刚开始时，OLED像素电路中的电路不稳定，发光控制子电路30控制发光子电路50关闭，几帧过后，当OLED像素电路中的电路稳定后，发光控制子电路30控制发光子电路50开启。这样一来，当发光子电路50开启时，OLED像素电路中的电路已经较为稳定，此时OLED像素电路内的多个驱动晶体管的开启程度较为均一，使得经驱动晶 体管流向发光器件的电流的大小较为均一，从而可很好的避免显示面板出现闪屏现象。
进一步具体的，如图2所示，驱动子电路40包括存储电容Cst和驱动晶体管Td。
存储电容Cst的第一端连接初始化子电路10、数据写入与补偿子电路20、以及发光控制子电路30，第二端连接驱动晶体管Td的栅极。
驱动晶体管Td的第一极连接第一电压端V1，第二极连接发光控制子电路30、以及数据写入与补偿子电路20。
需要说明的是，所述驱动子电路40还可以包括并联的多个驱动晶体管Td。上述仅仅是对驱动子电路40的举例说明，其它与该驱动子电路40功能相同的结构在此不再一一赘述，但都应当属于本发明的保护范围。
如图2所示，初始化子电路10包括第一晶体管T1和第二晶体管T2。
第一晶体管T1的栅极连接第一信号端S1，第一极连接第一电压端V1，第二极连接存储电容Cst的第一端。
第二晶体管T2的栅极连接第一信号端S1，第一极连接初始电压端Vinit，第二极连接存储电容Cst的第二端。
需要说明的是，所述初始化子电路10还可以包括与第一晶体管T1并联的多个开关晶体管、和/或与第二晶体管T2并联的多个开关晶体管。上述仅仅是对初始化子电路10的举例说明，其它与初始化子电路10功能相同的结构在此不再一一赘述，但都应当属于本发明的保护范围。
如图2所示，数据写入与补偿子电路20包括第三晶体管T3和第四晶体管T4。
第三晶体管T3的栅极连接扫描信号端S3，第一极连接数据电压端Vdata，第二极连接存储电容Cst的第一端。
第四晶体管T4的栅极连接扫描信号端S3，第一极连接驱动晶体管Td的第二极，第二极连接存储电容Cst的第二端。
需要说明的是，所述数据写入与补偿子电路20还可以包括与第三晶体管T3并联的多个开关晶体管、和/或与第四晶体管T4并联的多个开关晶体管。上述仅仅是对数据写入与补偿子电路20的举例说明，其它与数据写入与补偿子电路20功能相同的结构在此不再一一赘述，但都应当属于本发明的保护范围。
如图2所示，发光控制子电路30包括第五晶体管T5、第六晶体管T6和第七晶体管T7。
第五晶体管T5的栅极连接使能信号端EM，第一极连接第二电压端V2，第二极连接存储电容Cst的第一端。
第六晶体管T6的栅极连接使能信号端EM，第一极连接驱动晶体管Td的第二极，第二极连接发光子电路50。
第七晶体管T7的栅极连接第二信号端S2，第一极连接第第三电压端V3，第二极连接发光子电路50。
需要说明的是，所述发光控制子电路30还可以包括与第五晶体管T5并联的多个开关晶体管、和/或与第六晶体管T6并联的多个开关晶体管、和/或与第七晶体管T7并联的多个开关晶体管。上述仅仅是对发光控制子电路30的举例说明，其它与发光控制子电路30功能相同的结构在此不再一一赘述，但都应当属于本发明的保护范围。
如图2所示，发光子电路50包括发光器件L，发光器件L的阳极连接第六晶体管T6的第二极，阴极连接第七晶体管T7的第二极。
基于上述对各子电路具体电路的描述，以下结合图2和图3对上述OLED像素驱动电路的具体驱动过程进行详细的说明。
需要说明的是，第一、本发明实施例对各个子电路以及单元中的晶体管的类型不做限定，即上述驱动晶体管Td、第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4、第五晶体管T5、第六晶体管T6以及第七晶体管T7可以是为N型晶体管或者P型晶体管。本发明以下实施例均是以上述晶体管均为P型晶体管为例进行的说明。
其中，上述晶体管的第一极可以是漏极、第二极可以是源极；或者，第一极可以是源极、第二极可以是漏极。本发明实施例对此 不作限制。
此外，根据晶体管导电方式的不同，可以将上述像素电路中的晶体管分为增强型晶体管和耗尽型晶体管。本发明实施例对此不作限制。
第二、本发明实施例均是以第一电压端V1输入高电平，第三电压端V2输入低电平，或将第二电压端V2接地处理为例进行的说明，并且，这里的高、低仅表示输入的电压之间的相对大小关系。
如图3所示，该OLED像素电路的每一帧显示过程可以分为初始化阶段P1、数据写入与补偿阶段P2和发光阶段P3。图3中在发光阶段P3第二信号端S2的电压值中，粗实线表示第1-N帧中每一帧的第二信号端S2的波形图，细实线表示第N帧以后的每一帧的第二信号端S2的波形图。具体的：
复位阶段P1，第一信号端S1输入低电平开启信号，第二信号端S2、使能信号端EM以及扫描信号端S3输入高电平截止信号，基于此，图2所示的OLED像素电路的等效电路图如图4所示，第一晶体管T1和第二晶体管T2导通，第三晶体管T3、第四晶体管T4、第五晶体管T5、第六晶体管T6、第七晶体管T7和驱动晶体管Td均截止，(处于截止状态的晶体管以打“×”表示)。
其中，第一晶体管T1导通，初始电压端Vini的电压写入到存储电容Cst的第二端；第二晶体管T2导通，第一电压端V1的电压写入到存储电容Cst的第一端，对存储电容Cst两端的电压进行初始化。此处，初始电压端Vini的电压应高于驱动晶体管Td的开启电压，当初始电压端Vini的电压写入到存储电容Cst的第二端后，驱动晶体管Td应保持截止状态。
数据写入阶段P2，扫描信号端S3输入低电平开启信号，第一信号端S1、第二信号端S2以及使能信号端EM输入高电平截止信号，基于此，图2所示的OLED像素电路的等效电路图如图5所示，第三晶体管T3、第四晶体管T4和驱动晶体管Td均打开，第一晶体管T1、第二晶体管T2、第五晶体管T5、第六晶体管T6和第七晶体管T7均截止。
其中，第三晶体管T3导通，数据电压端Vdata的电压写入到存 储电容Cst的第一端，存储电容Cst的第一端的电压由V1变为Vdata，变化量为ΔV1＝V1-Vdata，基于此，存储电容Cst的第二端的电压变为Vini-ΔV1，此时，存储电容Cst的第二端的电压控制驱动晶体管Td开启。在驱动晶体管Td和第四晶体管T4均导通时，第一电压端V1的电压经驱动晶体管Td和第四晶体管T4写入到存储电容Cst的第二端，由于驱动晶体管Td中存在阈值电压Vth，因此此时存储电容Cst的第二端的电压变为V1+Vth，存储电容Cst的第二端的电压上升，高于控制驱动晶体管Td的开启电压，控制驱动晶体管Td截止。
发光阶段P3，第一帧到第N帧的发光阶段(N为大于等于1的正整数)，使能信号端EM输入低电平开启信号，第一信号端S1、第二信号端S2、以及扫描信号端S3输入高电平截止信号，基于此，图2所示的OLED像素电路的等效电路图如图6所示，第五晶体管T5、第六晶体管T6和驱动晶体管Td均打开，第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4和第七晶体管T7均截止。
其中，第五晶体管T5导通，第二电压端V2的电压写入到存储电容Cst的第一端，存储电容Cst第一端的电压由Vdata变为V2，变化量为ΔV2＝Vdata-V2，基于此，存储电容Cst的第二端的电压变为V1+Vth-ΔV2＝V1+Vth–Vdata+V2，此时，存储电容Cst的第二端的电压降低，控制驱动晶体管Td开启。在驱动晶体管Td和第六晶体管T6均导通时，第一电压端V1的电压经驱动晶体管Td和第六晶体管T6写入到发光器件L的阳极。但由于第七晶体管T7截止，第三电压端V3的电压无法写入到发光器件L的阴极，此时发光器件L保持关闭。
第N+1帧以后的每一帧的发光阶段，使能信号端EM和第二信号端S2输入低电平开启信号，第一信号端S1、以及扫描信号端S3输入高电平截止信号，基于此，图2所示的OLED像素电路的等效电路图如图7所示，第五晶体管T5、第六晶体管T6、第七晶体管T7和驱动晶体管Td均打开，第一晶体管T1、第二晶体管T2、第三晶体管T3和第四晶体管T4均截止。
其中，第五晶体管T5导通，第二电压端V2的电压写入到存储 电容Cst的第一端，存储电容Cst第一端的电压由Vdata变为V2，变化量为ΔV2＝Vdata-V2，基于此，存储电容Cst的第二端的电压变为V1+Vth-ΔV2＝V1+Vth–Vdata+V2，此时，存储电容Cst的第二端的电压降低，控制驱动晶体管Td开启。在驱动晶体管Td和第六晶体管T6均导通时，第一电压端V1的电压经驱动晶体管Td和第六晶体管T6写入到发光器件L的阳极。第七晶体管T7导通，第三电压端V3的电压写入到发光器件L的阴极，此时发光器件L开启进行画面显示。
在发光阶段P3中，驱动晶体管Td开启后，当驱动晶体管Td的栅-源电压Vgs减去驱动晶体管Td的阈值电压Vth得到的值小于等于驱动晶体管Td的漏-源电压Vds时，即Vgs-Vth≤Vds时，驱动晶体管Td能够处于饱和开启状态，此时流过驱动晶体管Td的驱动电流I为：
Figure PCTCN2017107624-appb-000001
其中，K＝W/L×C×u，W/L为驱动晶体管Td的宽长比，C为沟道绝缘层电容，u为沟道载流子迁移率。
上述参数只与驱动晶体管Td结构有关，因此，流过驱动晶体管Td的电流只与数据电压端Vdata输出的用于实现显示的数据电压和第二电压端V2输出的电压有关，与驱动晶体管Td的阈值电压Vth无关，从而消除了驱动晶体管Td的阈值电压Vth对发光器件L发光亮度的影响，提高了发光器件L亮度的均一性。
本发明实施例还提供一种显示装置，包括上述OLED像素电路。
本发明实施例提供一种显示装置，包括如上所述的任意一种像素驱动电路。所述显示装置可以包括多个像素单元阵列，每一个像素单元包括如上所述的任意一个像素驱动电路。本发明实施例提供的显示装置具有与本发明前述实施例提供的像素驱动电路相同的有益效果，由于像素驱动电路在前述实施例中已经进行了详细说明， 此处不再赘述。
本发明实施例还提供一种OLED像素电路的驱动方法，如图8所示，该驱动方法包括：
S10、在一帧的初始化阶段P1，初始化子电路10在第一信号端S1、第一电压端V1、以及初始电压端Vinit的控制下，对驱动子电路40进行初始化。
S20、在一帧的数据写入与补偿阶段P2，数据写入与补偿子电路20在扫描信号端S3的控制下，通过数据电压端Vdata输入的信号，对驱动子电路40进行阈值电压的补偿。
S30、在第一帧到第N帧中，每一帧的发光阶段P4，发光控制子电路30在使能信号端EM、第二电压端V2、第二信号端S2、以及第三电压端V3的控制下，控制发光子电路50关闭。
S40、在第N帧以后的每一帧的发光阶段，发光控制子电路30在使能信号端EM、第二电压端V2、第二信号端S2、以及第三电压端V3的控制下，控制发光子电路50开启。
其中，N为整数，且1≤N≤5。
本发明实施例提供一种OLED像素电路的驱动方法，采用发光控制子电路30对发光子电路50的开启或关闭进行控制，具体的，在显示刚开始时，OLED像素电路中的电路不稳定，发光控制子电路30控制发光子电路50关闭，几帧过后，当OLED像素电路中的电路稳定后，发光控制子电路30控制发光子电路50开启。这样一来，当发光子电路50开启时，OLED像素电路中的电路已经较为稳定，此时OLED像素电路内的多个驱动晶体管的开启程度较为均一，使得经驱动晶体管流向发光器件的电流的大小较为均一，从而可很好的避免显示面板出现闪屏现象。
考虑到两帧过后，OLED像素电路中的电路已经较为稳定，因此，本发明实施例在一个实施例中，N＝2。
在一个实施例中，初始化子电路10包括第一晶体管T1和第二晶体管T2。
在一帧的初始化阶段P1，第一信号端S1输入初始化信号，控制 第一晶体管T1和第二晶体管T2打开，对驱动子电路40进行初始化。
在一个实施例中，数据写入与补偿子电路20包括第三晶体管T3和第四晶体管T4。
在一帧的数据写入与补偿阶段P2，扫描信号端S3输入扫描信号，控制第三晶体管T3和第四晶体管T4打开，对驱动子电路40进行阈值电压的补偿。
在一个实施例中，发光控制子电路30包括第五晶体管T5、第六晶体管T6和第七晶体管T7。
在第一帧到第N帧中，每一帧的发光阶段P3，使能信号端EM输入使能信号，控制第五晶体管T5和第六晶体管T6打开，第二信号端S2输入第一信号控制第七晶体管T7截止，控制发光子电路50关闭。
在第N帧以后的每一帧的发光阶段P3，使能信号端EM输入使能信号，控制第五晶体管T5和第六晶体管T6打开，第二信号端S2输入第二信号控制第七晶体管T7打开，控制发光子电路50开启。
除非另作定义，此处使用的技术术语或者科学术语应当为本发明所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (14)

  1. 一种OLED像素电路，包括：初始化子电路、数据写入与补偿子电路、发光控制子电路、驱动子电路、以及发光子电路；
    所述初始化子电路，分别连接所述驱动子电路、第一信号端、第一电压端、以及初始电压端，用于在所述第一信号端、所述初始电压端、以及所述第一电压端的控制下，对所述驱动子电路进行初始化；
    所述数据写入与补偿子电路，分别连接所述驱动子电路、扫描信号端、以及数据电压端，用于在所述扫描信号端的控制下，通过所述数据电压端输入的信号，对所述驱动子电路进行阈值电压的补偿；
    所述驱动子电路，还连接所述发光控制子电路以及所述第一电压端，用于在得到阈值电压的补偿后，在所述第一电压端以及所述发光控制子电路的控制下，驱动所述发光子电路进行发光；
    所述发光控制子电路，还连接所述发光子电路、使能信号端、第二电压端、第二信号端、以及第三电压端，用于在所述使能信号端、所述第二电压端、所述第二信号端、以及所述第三电压端的控制下，使所述发光子电路开启或关闭。
  2. 根据权利要求1所述的OLED像素电路，其中，在第一帧到第N帧中，在每一帧的发光阶段，发光控制子电路在使能信号端、第二电压端、第二信号端、以及第三电压端的控制下，控制发光子电路关闭；
    在第N帧以后的每一帧的发光阶段，所述发光控制子电路在所述使能信号端、所述第二电压端、所述第二信号端、以及所述第三电压端的控制下，控制所述发光子电路开启；
    其中，N为整数，且1≤N≤5。
  3. 根据权利要求1所述的OLED像素电路，其中，所述驱动子电路包括存储电容和驱动晶体管；
    所述存储电容的第一端连接所述初始化子电路、所述数据写入与补偿子电路、以及所述发光控制子电路，第二端连接所述驱动晶体管的栅极；
    所述驱动晶体管的第一极连接所述第一电压端，第二极连接所 述发光控制子电路、以及所述数据写入与补偿子电路。
  4. 根据权利要求3所述的OLED像素电路，其中，所述初始化子电路包括第一晶体管和第二晶体管；
    所述第一晶体管的栅极连接所述第一信号端，第一极连接所述第一电压端，第二极连接所述存储电容的第一端；
    所述第二晶体管的栅极连接所述第一信号端，第一极连接所述初始电压端，第二极连接所述存储电容的第二端。
  5. 根据权利要求3所述的OLED像素电路，其中，所述数据写入与补偿子电路包括第三晶体管和第四晶体管；
    所述第三晶体管的栅极连接所述扫描信号端，第一极连接所述数据电压端，第二极连接所述存储电容的第一端；
    所述第四晶体管的栅极连接所述扫描信号端，第一极连接所述驱动晶体管的第二极，第二极连接所述存储电容的第二端。
  6. 根据权利要求3所述的OLED像素电路，其中，所述发光控制子电路包括第五晶体管、第六晶体管和第七晶体管；
    所述第五晶体管的栅极连接所述使能信号端，第一极连接所述第二电压端，第二极连接所述存储电容的第一端；
    所述第六晶体管的栅极连接所述使能信号端，第一极连接所述驱动晶体管的第二极，第二极连接所述发光子电路；
    所述第七晶体管的栅极连接所述第二信号端，第一极连接所述第第三电压端，第二极连接所述发光子电路。
  7. 根据权利要求6所述的OLED像素电路，其中，在第一帧到第N帧中，每一帧的发光阶段，使能信号端输入使能信号，控制第五晶体管和第六晶体管打开，第二信号端输入第一信号控制第七晶体管截止，控制所述发光子电路关闭；在第N帧以后的每一帧的发光阶段，使能信号端输入使能信号，控制第五晶体管和第六晶体管打开，第二信号端输入第二信号控制第七晶体管打开，控制所述发光子电路开启。
  8. 根据权利要求6所述的OLED像素电路，其中，所述发光子电路包括发光器件；
    所述发光器件的阳极连接所述第六晶体管的第二极，阴极连接所述第七晶体管的第二极。
  9. 一种显示装置，包括权利要求1-8任一项所述的OLED像素 电路。
  10. 一种OLED像素电路的驱动方法，包括：
    在一帧的初始化阶段，初始化子电路在第一信号端、第一电压端、以及初始电压端的控制下，对驱动子电路进行初始化；
    在一帧的数据写入与补偿阶段，数据写入与补偿子电路在扫描信号端的控制下，通过数据电压端输入的信号，对所述驱动子电路进行阈值电压的补偿；
    在第一帧到第N帧中，每一帧的发光阶段，发光控制子电路在使能信号端、第二电压端、第二信号端、以及第三电压端的控制下，控制发光子电路关闭；在第N帧以后的每一帧的发光阶段，所述发光控制子电路在所述使能信号端、所述第二电压端、所述第二信号端、以及所述第三电压端的控制下，控制所述发光子电路开启；
    其中，N为整数，且1≤N≤5。
  11. 根据权利要求10所述的驱动方法，其中，N等于2。
  12. 根据权利要求10所述的驱动方法，其中，所述初始化子电路包括第一晶体管和第二晶体管；
    在一帧的初始化阶段，所述第一信号端输入初始化信号，控制第一晶体管和第二晶体管打开，对所述驱动子电路进行初始化。
  13. 根据权利要求10所述的驱动方法，其中，所述数据写入与补偿子电路包括第三晶体管和第四晶体管；
    在一帧的数据写入与补偿阶段，所述扫描信号端输入扫描信号，控制第三晶体管和第四晶体管打开，对所述驱动子电路进行阈值电压的补偿。
  14. 根据权利要求10所述的驱动方法，其中，所述发光控制子电路包括第五晶体管、第六晶体管和第七晶体管；
    在第一帧到第N帧中，每一帧的发光阶段，使能信号端输入使能信号，控制第五晶体管和第六晶体管打开，第二信号端输入第一信号控制第七晶体管截止，控制所述发光子电路关闭；在第N帧以后的每一帧的发光阶段，使能信号端输入使能信号，控制第五晶体管和第六晶体管打开，第二信号端输入第二信号控制第七晶体管打开，控制所述发光子电路开启。
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